Information
-
Patent Grant
-
6649853
-
Patent Number
6,649,853
-
Date Filed
Tuesday, December 4, 200122 years ago
-
Date Issued
Tuesday, November 18, 200320 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Oblon, Spivak, McClelland, Maier & Neustadt, P.C.
-
CPC
-
US Classifications
Field of Search
US
- 218 43
- 218 45
- 218 2
- 218 7
- 218 14
- 218 80
- 218 84
- 218 92
- 218 120
- 218 140
- 218 67
- 200 82 B
-
International Classifications
-
Abstract
The present invention provides a switchgear, which can achieve miniaturization and simplification while securing high operation reliability, and excellent in assembly, operability and inspection, and further, has a compact size. A fluid pressure operating section is provided in a mechanical box arranged on a lower end portion of a support porcelain tube. Insulated operating rods are received in the support porcelain tube, and connecting mechanisms are received in a container. Switching contacts of circuit breaker and disconnecting switches and the fluid pressure operating section are connected via the connecting mechanisms and the insulated operating rods.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fluid pressure driving apparatus for switching a contact of gas insulated switchgear, and in particular, to a combined type fluid pressure driving apparatus for driving a circuit breaker and a disconnecting switch.
2. Description of the Related Art
In recent years, a gas insulated switchgear has been mainly used in switchgear for electric power. The gas insulated switchgear is constructed in a manner that many switches are arranged in a metal housing container filled with an insulating gas. Various type of switchgears have been proposed such that a gas insulated disconnecting switch is interposed between a power circuit breaker and any two busbars, between two busbars, between the power circuit breaker and a grounding contact or between the power circuit breaker and a power transmission system.
The typical conventional gas insulated switchgear has been disclosed in U.S. Pat. No. 5,841,087, and a disconnecting switch of the gas insulated switchgear will be described below with reference to FIG.
14
and FIG.
15
.
FIG. 14
is a front sectional view showing a conventional gas insulated disconnecting switch, and
FIG. 15
is a side sectional view taken along a line B—B of FIG.
14
.
As shown in
FIG. 14
, a disconnecting switch
200
is received in a grounding metal container
201
, which is filled with an insulating gas, e.g., SF
6
gas. An upper portion of the grounding metal container
201
is formed with first and second attachment flanges
203
and
204
, and a first stationary electrode
205
is fixed to the first attachment flange
203
via an insulating spacer. Likewise, a second stationary electrode
206
is fixed to the second attachment flange
204
. Namely, these stationary electrodes
205
and
206
are fixed in a state of being electrically insulated from the grounding metal container
201
.
Further, as shown in
FIG. 15
, a lower portion of the grounding metal container
201
is formed with a third attachment flange
208
, and a side portion thereof is formed with a fourth attachment flange
209
. A third stationary electrode
210
electrically connected to the grounding metal container
201
is fixed to the third attachment flange
208
, and a metallic cover
211
is attached to the fourth attachment flange
209
. A hollow insulating cylinder
212
extending toward the grounding metal container
201
is fixed to the cover
211
, and a drive shaft
213
is inserted into a hollow portion of the insulating cylinder
212
. The drive shaft
213
is extended from the outside of the grounding metal container
201
to the inside thereof, and penetrates through the cover
211
while airtightly keeping the insulating gas.
In FIG.
14
and
FIG. 15
, first to third cylindrical movable electrodes
215
to
217
individually pair with the first to third stationary electrodes
205
,
206
and
210
so that first to third contacts
218
to
220
are formed. Further, the movable electrodes
215
to
217
are electrically connected to a current terminal
223
by current application via a sliding contact (not shown) and a shielding element container
222
.
The current terminal
223
is connected with another switching device, e.g., a circuit breaker. A main bus conductor is connectable to the stationary electrode insulated from the grounding metal container
201
, that is, the first and second stationary electrodes
205
and
206
. Thus, the first and second contacts
218
and
219
perform a function as busbar or main bus line select disconnecting switch. Further, the third stationary electrode
210
making short-circuit with the grounding metal container
201
has a ground potential; therefore, the third contact
220
functions as a ground system.
By the way, a gearbox
225
for making a switching operation of the contacts
218
to
220
is received in the metal container
222
. The gearbox
225
includes first to third cams
226
,
230
and
233
, and first to sixth levers
227
,
228
,
231
,
232
,
234
and
235
. More specifically, the first cam
226
is connected to the first movable electrode
215
, and the first and second levers
227
and
228
are arranged so as to hold the first cam
226
between them. The second cam
230
is connected to the second movable electrode
216
, and the third and fourth levers
231
and
232
are arranged so as to hold the second cam
230
between them. The third cam
233
is connected to the third movable electrode
217
, and the fifth and sixth levers
234
and
235
are arranged so as to hold the third cam
233
between them.
Further, the gearbox
225
drives three movable electrodes, that is, first to third movable electrodes
215
to
217
so as to separate and close the paired first to third stationary electrodes
205
,
206
and
210
, and thereby, makes the switching operation of the first to third contacts
218
to
220
.
The first movable electrode
215
is connected with the first cam
226
, and the paired first and second levers
227
and
228
are fixed to the drive shaft
213
at an angle different from each other so as to convert a rotating motion of the drive shaft
213
into a reciprocating motion. Further, the levers
227
and
228
of the first cam
226
are individually provided with a pin at their distal end portion. Both sides of the first cam
226
are formed with a circular-arc groove, and the pin of each distal end of the levers
227
and
228
is slidably inserted into the above groove.
The first cam
226
constructed as described above functions as a cam mechanism for converting a rotary driving force of the drive shaft
213
into a linear reciprocating motion. Therefore, the first cam
226
converts a rotary driving force of the drive shaft
213
into a linear reciprocating motion, and then, transmits it to the first movable electrode
215
. When the rotary driving force is transmitted to the first movable electrode
215
, the first movable electrode
215
makes a linear reciprocating motion so as to carry out a switching operation of the first contact
218
.
In this case, the first cam
226
is formed with a thin and long slot
236
(as shown in
FIG. 14
) having a width such that the drive shaft
213
can pass through there. The drive shaft
213
passes through the slot
236
, and thereby, this performs a function as one fulcrum for the linear reciprocating motion of the first cam
226
.
On the other hand, the second and third movable electrodes
216
and
217
include the same cam mechanism as the above-mentioned first movable electrode
215
, and make the same linear reciprocating motion.
The gearbox
225
is rotated when a driving force is transmitted to the drive shaft
213
from an operating mechanism section (not shown) arranged at the outside of the grounding metal container
201
in the drive shaft
213
of the disconnecting switch
200
. The above operating mechanism section and the gearbox
225
constitute a driving system for switching and driving the first to third contacts
218
to
220
.
In the conventional driving apparatus, the first to third contacts
218
to
220
are switched and driven by the driving system including the operating mechanism section and the gearbox
225
. More specifically, when the operating mechanism section is driven, the drive shaft
213
of the gearbox
225
is rotated by receiving the driving force, and then, the first lever
227
to the sixth lever
235
are rotated with the rotation.
Then, each distal pin of the rotating first and second levers
227
and
228
moves along the cam groove of the first cam
226
. Likewise, each distal pin of the rotating third and fourth levers
231
and
232
moves along the cam groove of the second cam
230
, and further, each pin of the rotating fifth and sixth levers
234
and
235
moves along the cam groove of the third cam
233
.
The first lever
227
to the sixth lever
235
and the first cam
226
to the third cam
233
interact with each other, and thereby, it is possible to convert the rotating motion of the drive shaft
213
into a linear reciprocating motion. The rotary driving force of the drive shaft
213
thus converted is transmitted to the first to third movable electrodes
215
to
217
.
By the driving force thus transmitted, the first movable electrode
215
moves to the axial direction so as to make a switching operation of the first contact
218
. Likewise, the second movable electrode
216
moves to the axial direction so as to make a switching operation of the second contact
219
, and further, the third movable electrode
217
moves to the axial direction so as to make a switching operation of the third contact
220
.
The gearbox
225
included in the disconnecting switch has been described above. However, in the conventional driving apparatus, the driving apparatus is required for a circuit breaker existing outside the figure. Thus, there is a need of providing an independent driving apparatus for each contact of apparatuses such as disconnecting switch and circuit breaker; as a result, the driving apparatus has been made into a large size. For this reason, the gas insulated switchgear is inevitably made into a large size. More specifically, in the above gearbox
225
, one cam and two levers are required with respect to one movable electrode; as a result, the number of components is increased. Further, the number of components is increased; as a result, the structure becomes complicate, and manufacture assembly cost becomes high; therefore, this is disadvantageous in economization.
Moreover, when the number of components is increased, the apparatus configuration becomes complicate, and further, a space for receiving the gearbox
225
must be widened. More specifically, the metal container
222
for receiving the gearbox
225
and the grounding metal container
201
of the disconnecting switch
200
are made into a large size; as a result, the driving apparatus and the gas insulated switchgear are also made into a large size. When the apparatus is made into a large size, the cost is high; therefore, this is disadvantageous in economization.
In addition, in the driving apparatus, it is extremely important to secure an operation reliability. Thus, in order to secure the operation reliability, there is a need of assembling the complicate apparatus with high precision. However, when the number of components is increased, the apparatus configuration becomes complicate, and further, a work for assembling the driving apparatus becomes complicate; as a result, the work efficiency is reduced. Meanwhile, in the operation, maintenance and inspection, in the case where the apparatus configuration is complicate, the disassembling work for maintenance and inspection becomes complicate; as a result, there is a possibility of reducing the operability, maintenance and inspection performance when the apparatus is actually used.
SUMMARY OF THE INVENTION
The present invention has been made in view of the problems in the prior art. Accordingly, an object of the present invention is to provide a combined type fluid pressure driving apparatus, which can achieve small integration and simplification while securing high operation reliability, and has a switch made into a compact size.
Another object of the present invention is to provide a combined type fluid pressure driving apparatus, which is excellent in assembly, operation maintenance and inspection performance.
In order to achieve the above object, according to one aspect, the present invention provides a combined type fluid pressure driving apparatus comprising:
a metal container including a hollow support porcelain tube and a plurality of receiving porcelain tubes;
each contact of circuit breaker and disconnecting switch having a stationary electrode fixed in each of the receiving porcelain tubes, and a movable electrode received so as to freely separate from and close to the stationary electrode;
an insulating gas sealed in the metal container, the support porcelain tube and the receiving porcelain tube;
an insulated operating rod operated in the support porcelain tube;
a mechanical box arranged on the other end of the support porcelain tube;
a fluid pressure operating device received in the mechanical box and driven by fluid pressure; and
a connecting mechanism section provided in the metal container,
an operating force of the fluid pressure operating device being transmitted from the insulated operating rod to the movable electrode via the connecting mechanism section so that each contact of the circuit breaker and the disconnecting switch is switched (opened and closed).
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes:
a plurality of fluid pressure cylinders switching and driving each switching contact of the circuit breaker and the disconnecting switch in accordance with feed and discharge of high-pressure fluid;
a plurality of fluid pressure control valves for independently driving each of the fluid pressure cylinders;
an accumulator for storing a high-pressure working fluid supplied to a plurality of fluid pressure cylinders and fluid pressure control valves;
a pump for supplying the high-pressure working fluid into the accumulator; and
a low-pressure tank for storing a low-pressure fluid discharged from the fluid pressure cylinders.
According to the above invention, a fluid pressure driving method is employed for readily achieving high output by high pressure, and therefore, it is possible to make compact the fluid pressure cylinder and the fluid pressure control valve, which are principal components of the fluid pressure operating device. Further, the accumulator, the pump and the low-pressure tank required for the drive are used in common between different apparatuses and the fluid pressure operating device. By doing so, it is possible to greatly reduce the number of components, and to achieve a simplification of structure.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device further includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch; and a manifold forming the fluid pressure cylinder at the circuit-breaker fluid pressure operating section, and the manifold is removably attached with the accumulator, the pump, the low-pressure tank and the disconnecting-switch fluid pressure operating section.
According to the above invention, members such as the accumulator, the pump and the low-pressure tank, which are used in common between the circuit-breaker fluid pressure operating section and two disconnecting-switch fluid pressure operating section, are attached to the manifold of the circuit-breaker fluid pressure operating section side. Therefore, there is no need of providing connective pipe required for connecting two fluid pressure operating sections, and this contributes to integral combination of the driving apparatus. As a result, a design for saving a space is possible, and the driving apparatus can be made compact. Further, the member attached to the manifold of the circuit-breaker fluid pressure operating section is freely removable, so that a disassembling work for inspection can be simply carried out, and maintenance and inspection performance can be improved.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section the disconnecting-switch fluid pressure operating section are connected with each other via a fluid pipe.
According to the above invention, in accordance with the layout of the plural contacts constituting the switchgear, a part or all of the disconnecting-switch fluid pressure operating section is arranged on the position far from the circuit-breaker fluid pressure operating section. In Such a case, the disconnecting-switch fluid pressure operating section and the circuit-breaker fluid pressure operating section are merely connected using pipe; therefore, it is possible to sufficiently secure a degree of freedom in design. Further, the accumulator, the pump and the low-pressure tank are used in common, and therefore, the fluid pressure driving apparatus can be made compact by integral combination.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the apparatus is provided with a piston holding mechanism, which holds a position of fluid pressure piston sliding in each of fluid pressure cylinders when the high-pressure working fluid of the accumulator is lost.
According to the above invention, when the high-pressure working fluid of the accumulator is lost, the lock mechanism is operated so as to hold the position of the fluid pressure piston; therefore, it is possible to securely hold the switching state of contact. By doing so, it is possible to improve safety and reliability of the apparatus.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the driving apparatus further includes: a driving rod extending from a fluid pressure piston fixed integrally with a flange; an expansible rod mechanism for expansibly connecting a support member fixed in the mechanical box with the flange; and an elastic element for elastically holding a position of the fluid pressure piston by an operating rod of the expansible rod mechanism.
According to the above invention, the making and breaking position of the fluid pressure piston is securely held by a load of compression spring regardless of the fluid pressure. Further, it is possible to visibly confirm the switching state of contact from the outside; therefore, inspection can be readily made.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the driving rod extending from the fluid pressure piston and a support bracket fixed in the mechanical box are individually formed with an attachment hole aligned with each other, and a lock pin is inserted into the aligned, and thereby, a mechanism for holding the position of the fluid pressure piston is constructed.
According to the above invention, the lock pin is merely inserted into the hole of driving rod extending from the fluid pressure piston sliding in the fluid pressure cylinder, and thereby, the position of the fluid pressure piston can be held, and therefore, it is possible to carry out a work for holding the position of the fluid pressure piston by manual. Further, it is possible to visibly confirm the inspection, and thus, to improve safety and reliability.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and a piston rod extending from the fluid pressure piston of the disconnecting-switch fluid pressure operating section is slidable, and a cylinder head fixed to one end of the fluid pressure cylinder is arranged in the gearbox, and further, the cylinder head is attached with a fluid pressure control valve.
According to the above invention, the constituent components are arranged so as to centralize in the cylinder head of the disconnecting-switch fluid pressure operating section, and therefore, the other end of the fluid pressure cylinder may be attached with only member for sealing a working fluid, and the structure can be simplified. Further, a relatively heavy constituent component such as the fluid pressure control valve is arranged on the position near to the upper fixed point. Therefore, it is possible to realize a structure, which is durable to an external force such as vibration by the operation and vibration by the operation of the circuit-breaker fluid pressure operating section having a relatively large driving force, and is excellent in vibration proofing and strength. In particular, the lower end portion of the circuit-breaker fluid pressure operating section opposite to the cylinder head is light; therefore, the fluid pressure cylinder is readily attached in the horizontal direction, and there is no limitation in the attachment direction. As a result, a degree of freedom increases in the layout.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and an outer cylinder is concentrically arranged on an outer side of the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section so as to form a double cylindrical structure, and further, an annular gap between the double cylindrical structure is used as a control fluid passage for feeding and discharging a high-pressure working fluid to and from a cylinder chamber of the fluid pressure cylinder.
According to the above invention, the control fluid passage is provided coaxially with the fluid pressure cylinder; therefore, this is advantageous to simplify the structure and to save a space as compared with the case where the fluid passage is arranged separately.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section is attached to the cylinder head fixed in the mechanical box, and further, the fluid pressure control valve is arranged on the side opposite to the fluid pressure cylinder.
According to the above invention, the lower end portion of the circuit-breaker fluid pressure operating section needs to attach a member for sealing a working fluid, and the valve block of the fluid pressure control valve is used in common as the member, and thereby, it is possible to reduce the number of components, and thus, to simplify the structure. Further, the valve block is arranged on the cylindrical section of the fluid pressure cylinder; therefore, it is possible to make a design for making compact the driving apparatus without projecting the member into the radius direction.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and one end of the fluid pressure cylinder of disconnecting-switch fluid pressure operating section is attached to the cylinder head fixed in the mechanical box, and the fluid pressure control valve is provided on the side opposite to the fluid pressure cylinder while an outer cylinder is concentrically arranged on an outer side of the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section so as to form a double cylindrical structure, and further, an annular gap between the double cylindrical structure is used as a high-pressure fluid passage for always supplying a high-pressure fluid from the accumulator to the cylinder chamber of the fluid pressure cylinder.
According to the above invention, the high-pressure fluid passage is provided coaxially with the fluid pressure cylinder, and therefore, this is advantageous to simplify the structure and to save a space as compared with the case where the fluid passage is arranged separately.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and a piston rod extending from the fluid pressure piston of the disconnecting-switch fluid pressure operating section is slidable, and a cylinder head fixed to the fluid pressure cylinder is fixed in the mechanical box, and further, the cylinder head is attached with a fluid pressure control valve so that an operating axis of the fluid pressure control valve and an operating axis of the fluid pressure piston are perpendicular to each other.
According to the above invention, an external force such as vibration by the operation of the fluid pressure piston and vibration by the operation and vibration by the operation of the circuit-breaker fluid pressure operating section having a relatively large driving force acts to the operating axis direction of the fluid pressure piston. In such a case, it is possible to prevent an erroneous operation of the fluid pressure control valve, and thus, to realize the structure, which is excellent in reliability.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and at least one or more switching valve is provided on the midway of high-pressure and low-pressure fluid passages for connecting the circuit-breaker fluid pressure operating section with the disconnecting-switch fluid pressure operating section.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the high-pressure and low-pressure fluid passages for connecting the circuit-breaker fluid pressure operating section with the disconnecting-switch fluid pressure operating section are formed of a flexible pipe, and further, a connector with at least one or more check valve is provided on the midway thereof.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section or the disconnecting-switch fluid pressure operating section is connectable with an auxiliary fluid pressure source including at least one or more electrically-operated or manual pump.
In order to achieve the above object, according to another aspect, the present invention provides the combined type fluid pressure driving apparatus, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section or the disconnecting-switch fluid pressure operating section includes an auxiliary fluid pressure source including at least one or more electrically-operated or manual pump, and the an auxiliary fluid pressure source is provided with an electrically-operated or manual pump, an accumulator for storing a high-pressure fluid and an auxiliary tank for storing a low-pressure fluid.
According to the above invention, even if the fluid pressure of the combined type fluid pressure driving apparatus is reduced, it is possible to provide the combined type fluid pressure driving apparatus, which can readily perform various works such as inspection and repair of the fluid pressure operating section, replacement work and recovery work of fluid pressure without stopping the transmission line.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a view showing a combined type fluid pressure driving apparatus according to a first embodiment of the present invention;
FIG. 2
is an enlarged front view showing the neighborhood of mechanical box in the first embodiment;
FIG. 3
is a top plan view schematically showing the inside of mechanical box when viewed from a support porcelain tube shown in
FIG. 2
;
FIG. 4
is a view schematically showing a fluid pressure circuit of the combined type fluid pressure driving apparatus according to the first embodiment of the present invention;
FIG. 5
is a view schematically showing a fluid pressure circuit of combined type fluid pressure driving apparatus according to a second embodiment of the present invention;
FIG. 6
is a view showing a configuration of principal parts of combined type fluid pressure driving apparatus according to a third embodiment of the present invention;
FIG. 7
is a view partially showing a configuration of principal parts of combined type fluid pressure driving apparatus according to a fourth embodiment of the present invention;
FIG. 8
is a view partially showing a configuration of principal parts of combined type fluid pressure driving apparatus according to a fifth embodiment of the present invention;
FIG. 9
is a front sectional view showing a configuration of combined type fluid pressure driving apparatus according to a sixth embodiment of the present invention;
FIG. 10
is a side sectional view showing a configuration of combined type fluid pressure driving apparatus according to a sixth embodiment of the present invention;
FIG.
11
A and
FIG. 11B
are individually a front sectional view and a side view showing a combined type fluid pressure driving apparatus according to a seventh embodiment of the present invention;
FIG. 12
is a view schematically showing a fluid pressure circuit of combined type fluid pressure driving apparatus according to an eighth embodiment of the present invention;
FIG. 13
is a view showing a fluid pressure circuit including an auxiliary fluid pressure source in the eighth embodiment of the present invention;
FIG. 14
is a front sectional view showing a disconnecting switch of conventional gas insulated switchgear for electric power; and
FIG. 15
is a side sectional view taken along a line B—B of the conventional gas insulated switchgear for electric power shown in FIG.
14
.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Preferred embodiments of combined type fluid pressure driving apparatus according to the present invention will be described below with reference to the accompanying drawings.
[First embodiment]
A first embodiment of the combined type fluid pressure driving apparatus according to the present invention will be described below with reference to
FIG. 1
to FIG.
4
.
FIG. 1
is a view showing a combined type fluid pressure driving apparatus or hydraulic driving apparatus according to a first embodiment of the present invention. The combined type fluid pressure driving apparatus is applied to an insulating switch
1
used as gas insulated switchgear. The insulting switch
1
can produce connections between two of a plurality of any desired system components or disconnect these connections. The insulting switch
1
is applied to switch and drive an electric transmission line or power circuit of 100 MV˜500 MV, more preferably 100 MV˜300 MV.
The insulating switch
1
includes plural, e.g., three receiving porcelain tubes
2
,
2
a
and
2
b,
which are filled with an insulating gas, such as for example SF
6
or gaseous nitrogen. These receiving porcelain tubes
2
,
2
a
and
2
b
are individually formed of an insulating material such as insulator, and are fixed and held in a state of being attached to a metal container or housing
3
used as a main body case, which is formed of conductive metal material such as for example aluminum or aluminum alloy. In this case, these receiving porcelain tubes
2
,
2
a
and
2
b
are attached to the metal container
3
at a predetermined angle. Of these receiving porcelain tubes
2
,
2
a
and
2
b,
that is, the receiving porcelain tube
2
receives a contact
6
of circuit breaker
5
, while other receiving porcelain tubes
2
a
and
2
b
receive first and second contacts
8
a
and
8
b
of disconnecting switches
7
a
and
7
b,
respectively. The contacts
6
,
8
a
and
8
b
received in the receiving porcelain tubes
2
,
2
a
and
2
b
are composed of stationary electrodes or fixed switching elements
9
,
9
a
and
9
b
fixed to the distal end portion of the receiving porcelain tubes
2
,
2
a
and
2
b
and movable electrodes or movable switching elements
10
,
10
a
and
10
b,
respectively. These movable electrodes
10
,
10
a
and
10
b
are individually received so as to freely separate from and close to the stationary electrodes
9
,
9
a
and
9
b.
On the other hand, the metal container
3
is attached to an upper end portion of a hollow support porcelain tube
11
, and an insulting gas is sealed between the container
3
and the support porcelain tube
11
. The lower end portion of the support porcelain tube
11
is provided with a mechanical box
12
, such as gearbox. The gearbox
12
is provided with a fluid pressure operating device
13
, which is driven by fluid pressure of working fluid, such as for example working mineral oil (MIL 5606) which has a low viscosity change by temperature.
Further, the support porcelain tube
11
receives insulated operating rods
14
,
14
a
and
14
b,
which are driven by the fluid pressure operating device
13
. These operating rods
14
,
14
a
and
14
b,
which are formed of a fiber reinforced material, such as for example glass fiber reinforced material or fiber reinforced composite material, switch the contacts
6
,
8
a
and
8
b
via connecting mechanism sections
15
,
15
a
and
15
b
received in the metal container, respectively. The connecting mechanism section
15
,
15
a
and
15
b
constitute an operating force transmission mechanism comprising a bell crank mechanism or link mechanism. A reference numeral
19
, in
FIG. 1
, is an insulated guide sleeve, in which the movable electrode
10
of the circuit breaker
5
is freely slidable.
The fluid pressure operating device
13
of the combined type fluid pressure driving apparatus is constructed as shown in FIG.
2
and FIG.
3
.
FIG. 2
is an enlarged front view showing the mechanical box
12
of the combined type fluid pressure driving apparatus, and
FIG. 3
is a top plan view showing the inside of mechanical box
12
when viewed from a support porcelain tube
11
side.
As shown in FIG.
2
and
FIG. 3
, the fluid pressure operating device
13
is received in the mechanical box
12
. Further, the fluid pressure operating device
13
includes a circuit-breaker fluid pressure operating section
16
for, which controls the switching contact
6
of the circuit breaker
5
, and disconnecting-switch fluid pressure operating sections or devices
17
and
18
, which control switching of contacts
8
a
and
8
b
of two disconnecting switches
7
a
and
7
b.
The fluid pressure operating device
13
is constructed in a manner that these fluid pressure operating sections
16
to
18
are combined and integrally assembled. The hydraulic operating device
13
is mounted or supported on a box cap
12
a
of the mechanical box
12
so as to make an assembly thereof easily.
The circuit-breaker fluid pressure operating section
16
is received in the mechanical box
12
, and then, is fixed to a case cap
12
a
of the mechanical box
12
via an attachment frame
20
. Further, the circuit-breaker fluid pressure operating section
16
includes a fluid pressure cylinder
22
, a fluid pressure control valve
23
, an accumulator
24
, a pump
25
, a hydraulic or fluid pressure monitor
26
, and a low pressure tank
27
. More specifically, the fluid pressure cylinder
22
drives the contact
6
of the circuit breaker
5
, and the fluid pressure control valve
23
controls a working fluid for driving the fluid pressure cylinder
22
, such as a hydraulic actuator. The accumulator
24
always stores a working fluid, such as a working mineral oil, which is a high-pressure working fluid to the fluid pressure cylinder
22
, and the pump
25
generates a high-pressure working fluid. The fluid pressure monitor
26
monitors a pressure of high pressure working fluid, and the low pressure tank
27
stores a low-pressure fluid.
The fluid pressure cylinder
22
of the circuit-breaker fluid pressure operating section
16
is formed in a triangular block manifold
30
. The outer surface of the manifold
30
is attached with the fluid pressure control valve
23
, the hydraulic accumulator
24
, the pump
25
, the low pressure tank
27
and the fluid pressure monitor
26
, which are removable.
Further, a fluid pressure piston
32
is slidably received in the fluid pressure cylinder
22
, and a piston rod
33
is fixed as an operating rod to the fluid pressure piston
32
. The piston rod
33
is connected with a driving rod
34
. The driving rod
34
penetrates through a seal section
35
sealing an insulating gas, and then, is connected to the insulated operating rod
14
.
On the other hand, the disconnecting-switch fluid pressure operating sections
17
and
18
are fixed to the box cap
12
a
of the mechanical box
12
via attachment frames
20
a
and
20
b,
respectively. Further, the disconnecting-switch fluid pressure operating sections
17
and
18
include fluid pressure cylinders
37
and
38
, and fluid pressure control valves
39
and
40
, respectively. More specifically, the fluid pressure cylinders
37
and
38
switch the contacts
8
a
and
8
b
of two disconnecting switches
7
a
and
7
b,
respectively. The fluid pressure control valves
39
and
40
controls a working fluid for operating the fluid pressure cylinders
37
and
38
, respectively.
The disconnecting-switch fluid pressure operating sections
17
and
18
use the following elements included in the circuit-breaker fluid pressure operating section
16
in common. The elements are the accumulator
24
always storing a high-pressure working fluid to the fluid pressure cylinders
37
and
38
, the pump
25
generating a high-pressure working fluid, the fluid pressure monitor
26
monitoring a pressure of high pressure working fluid, and the low pressure tank
27
storing a low-pressure fluid.
The fluid pressure control valves
39
and
40
are attached to the manifolds
30
a
and
30
b
of the corresponding fluid pressure cylinders
37
and
38
, respectively, and are connected to the manifold
30
of the circuit-breaker fluid pressure operating section
16
side. Fluid pressure pistons
32
a
and
32
b
are slidably received in the fluid pressure cylinders
37
and
38
, respectively. The fluid pressure pistons
32
a
and
32
b
are provided with piston rods
33
a
and
33
b
as an operating rod, respectively. These piston rods
33
a
and
33
b
are connected with driving rods
34
a
and
34
b,
respectively. The driving rods
34
a
and
34
b
penetrate through seal sections
35
a
and
35
b
sealing an insulating gas, and then, are connected to the insulated operating rods
14
a
and
14
b,
respectively.
FIG. 4
is a view schematically showing a configuration of fluid pressure circuit of the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
constituting the fluid pressure driving device
13
.
First, the following is a description of the configuration of fluid pressure circuit of the circuit-breaker fluid pressure operating section
16
. The fluid pressure cylinder
22
is formed with a first cylinder chamber
43
, which forms a chamber for opening the contact
6
, at a piston rod
33
of the fluid pressure piston
32
, and is formed with a second cylinder chamber
44
at the side opposite to the piston rod
33
. The first cylinder chamber
43
of the fluid pressure cylinder
22
is communicated with the accumulator
24
via a high-pressure fluid passage
45
formed in the manifold
30
, and further, is communicated with the fluid pressure control valve
23
via the high-pressure fluid passage
45
. The second cylinder chamber
44
of the fluid pressure cylinder
22
is communicated with the fluid pressure control valve
23
.
The fluid pressure control valve
23
has a spool-valve type directional control valve body
46
, for changing the fluid passages, while being formed with a control port
47
, a fluid feed port
48
and a fluid discharge port
49
. The directional control valve body
46
is operated by an open electromagnetic coil
50
and a close electromagnetic coil
51
so as to be freely slidable. Further, the directional control valve body
46
selectively switches the control port
47
into the fluid feed port
48
or the discharge port
49
. The control port
47
feeds and discharges a high-pressure working fluid to and from the second cylinder chamber
44
of the fluid pressure cylinder
22
. The fluid feed port
48
is always communicated with the accumulator
24
and the first cylinder chamber
43
of the fluid pressure cylinder
22
via the high-pressure fluid passage
45
.
On the other hand, the fluid discharge port
49
is always connected to the low-pressure tank
55
via the low-pressure fluid passage
54
formed in the manifold
30
. The open electromagnetic coil
50
and the close electromagnetic coil
51
supply an electromagnetic force for sliding the directional control valve body
46
so as to switch the fluid passage of the directional control valve
23
.
The accumulator
24
is provided with an accumulator piston
57
, which is freely slidable therein. One side of the accumulator piston
57
, for example, a backside chamber
58
is filled with a high-pressure nitrogen gas or the like, and the other side thereof is formed with an accumulated fluid chamber
59
for storing a high-pressure working fluid, such as for example working mineral oil. Further, the accumulator
24
is connected directly to the manifold
30
, and then, is integrally constructed. The storage chamber
59
is always communicated with the first cylinder chamber
43
of the fluid pressure cylinder
22
via the high-pressure fluid passage
45
.
The pump
25
is attached to the manifold
30
via a receiving case
60
, and is driven by a motor (not shown). An outlet port
61
and an inlet port
62
of the pump
25
are communicated with the high-pressure fluid passage
45
and the low-pressure fluid passage
54
, respectively.
The low-pressure tank
27
is attached so as to cover a part of the side of manifold
30
. An opening portion of the low-pressure tank
27
communicates with the low-pressure fluid passage
54
of the manifold
30
.
Next, the following is a description of the configuration of fluid pressure circuit of the disconnecting-switch fluid pressure operating sections
17
and
18
. The fluid pressure cylinders
37
and
38
and the fluid pressure control valves
39
and
40
have the substantially same configuration as the fluid pressure cylinder
22
and the fluid pressure control valve
23
of the circuit-breaker fluid pressure operating section
16
. The fluid pressure cylinders
37
and
38
are provided at manifold blocks
30
a
and
30
b
extending from the manifold
30
. In this case, receive fluid pressure piston
32
a
and
32
b
are individually received in the fluid pressure cylinders
37
and
38
so as to be freely slidable. Piston rods
33
a
and
33
b
of the fluid pressure pistons
32
a
and
32
b
are formed with first cylinder chambers
43
a
and
43
b,
respectively. The sides opposite to the piston rods
33
a
and
33
b
are individually formed with second cylinder chambers
44
a
and
44
b.
The first cylinder chambers
43
a
and
43
b
of the fluid pressure cylinders
37
and
38
are communicated with the accumulator
24
and the fluid pressure control valves
39
and
40
via the high-pressure fluid passages
45
a
and
45
b
formed in the manifold blocks
30
a
and
30
b,
respectively. Further, the second cylinder chambers
44
a
and
44
b
of the fluid pressure cylinders
37
and
38
are communicated with the fluid pressure control valves
39
and
40
, respectively.
The fluid pressure cylinders
37
and
38
are provided with control ports
47
a
and
47
b,
fluid feed ports
48
a
and
48
b,
and fluid discharge ports
49
a
and
49
b,
respectively. More specifically, the control ports
47
a,
47
b
selectively feed and discharge a high-pressure working fluid to and from the second cylinder chambers
44
a
and
44
b
of the fluid pressure cylinders
37
and
38
, respectively. The fluid feed ports
48
a
and
48
b
communicate with the accumulator
24
and the first cylinder chambers
43
a
and
43
b
of the fluid pressure cylinders
37
and
38
via high-pressure fluid passages
45
a
and
45
b,
respectively. The fluid discharge ports
49
a
and
49
b
are connected to the low-pressure tank
27
via the low-pressure fluid passages
30
a
and
30
b
formed in the manifold blocks
30
a
and
30
b,
respectively.
Further, the fluid pressure cylinders
37
and
38
are provided with control valves
39
and
40
for changing the fluid passages, respectively. The directional control valve bodies
46
a
and
46
b
of the control valves
39
and
40
selectively switch control ports
47
a
and
47
b
into fluid feed ports
48
a
and
48
b
or fluid discharge ports
49
a
and
49
b,
respectively. Further, the directional control valve bodies
46
a
and
46
b
are driven by an electromagnetic force from open electromagnetic coils
50
a
and
50
b,
and close electromagnetic coils
51
a
and
51
b,
respectively. In
FIG. 4
, a reference numeral
52
denotes double busbars of power transmission system, which comprise first busbar
52
a
and second busbar
52
b,
such as main bus line, and a reference numeral
53
denotes an electric transmission line or circuit line. The electric transmission line
53
is electrically connected to both of the busbars
52
a
and
53
a,
such as main bus line, through a first circuit line
53
a
and second circuit line
53
b.
The movable electrode or movable switching element
10
of the circuit breaker
5
is fixed to a top end of a metal electrode rod
55
, which is slidably supported on an electrode terminal
56
. The electrode terminal
56
is electrically connected to two electrode terminals
56
a
and
56
b
of the disconnecting switches
7
a
and
7
b
via the metal housing
3
. The electrode terminals
56
a
and
56
b
supporting slidably metal electrode rods
55
a
and
55
b,
are fixed to the metal container or housing
3
in a gastight fashion. The metal electrode rods
55
a
and
55
b
have the movable electrodes or movable switching contacts
10
a
and
10
b
on the top thereof. Therefore, the movable switching element
10
,
10
a
and
10
b
are electrically connected to each other, and bottom ends of the electrode rods
55
,
55
a
and
55
b
are mechanical connected to the connecting mechanical sections (devices)
15
,
15
a
and
15
b,
respectively.
Subsequently, the following is a description of an operation of the fluid pressure operating device
13
of the combined type fluid pressure driving apparatus.
FIG. 4
shows a state that a current is applied to the contact
6
of the circuit breaker
5
of the insulating switch
1
, and the contacts
8
a
and
8
b
of the disconnecting switches
7
a
and
7
b.
Namely,
FIG. 4
shows a state that these contacts
6
,
8
a
and
8
b
are switched by the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
.
The accumulated fluid chamber
59
of the accumulator
24
of the fluid pressure operating section
16
is accumulated using compression of nitrogen gas pressing the accumulator piston
57
. A high-pressure working fluid from the accumulator
24
always acts to the first cylinder chamber
43
of the circuit-breaker fluid pressure cylinder
22
via the high-pressure fluid passage
45
. In this case, the high-pressure working fluid acts onto the surface of the fluid pressure piston
32
in the first cylinder chamber
43
, and the area is set as S
1
. Further, the force acting on the fluid pressure piston
32
is set as F
1
. Likewise, the high-pressure working fluid acts onto the disconnecting-switch fluid pressure cylinders
37
and
38
.
At that time, in the fluid pressure control valve
23
, the fluid feed port
48
and the control port
47
communicate with each other by the directional control valve body
46
; therefore, the high-pressure working fluid (fluid such as high-pressure working oil) acts to the second cylinder chamber
44
of the circuit-breaker fluid pressure cylinder
22
. In this case, the high-pressure working fluid acts onto the surface of the fluid pressure piston
32
in the second cylinder chamber
44
, and the area is set as S
1
. Further, the force acting on the fluid pressure piston
32
is set as F
2
.
In the fluid pressure operating device
13
of the combined type fluid pressure driving apparatus, the relation of acting area of the fluid pressure cylinder
22
to the fluid pressure piston
32
is S
1
<S
2
. Therefore, the force acting to the fluid pressure piston
32
is F
1
<F
2
. Namely, the fluid pressure piston
32
is pushed up from the second fluid pressure chamber
44
, and then, is kept at a making position as shown in FIG.
4
.
Likewise, in the fluid pressure control valves
39
and
40
, the fluid feed ports
48
a,
48
b
and the control port
47
a,
47
b
communicate with each other by the directional control valve bodies
46
a
and
46
b;
therefore, the fluid pressure pistons
32
a
and
32
b
are kept at a making position as shown in FIG.
4
.
As described above, in the fluid pressure operating device
13
of the combined type fluid pressure driving apparatus, all fluid pressure cylinders
22
,
37
and
38
are in a making state. In the case where the circuit breaker
5
and the disconnecting switches
7
a
and
7
b
are opened from the above state, that is, from the making state as shown in
FIG. 4
, the following operation is carried out.
In the case of carrying out a breaking operation for opening the contact
6
of the circuit breaker
5
, the circuit-breaker fluid pressure operating section
16
is operated. When a current is applied to the open electromagnetic coil
50
of the fluid pressure control valve
23
, the electromagnetic coil
50
is excited so that the directional control valve body
46
is moved to the left-hand side in FIG.
4
. Then, the directional control valve body
46
makes a fluid passage switching operation so that the control port
47
and the fluid discharge port
49
are communicated with each other. Therefore, the high-pressure working fluid of the second cylinder chamber
44
of the fluid pressure cylinder
22
is moved from the control port
47
to the fluid discharge port
49
. For this reason, a fluid pressure of the second cylinder chamber
44
is reduced; as a result, the force acting onto the fluid pressure piston
62
becomes the relation of F
1
>F
2
. The acting force F
1
of the high-pressure working fluid acting in the first cylinder chamber
43
drives the fluid pressure piston
32
so as to forcedly open the contact
6
of the circuit breaker
5
connected to the piston rod
33
. During this breaking operation, a discharged fluid from the second cylinder chamber
44
of the fluid pressure cylinder
22
is once recovered into the low-pressure tank
27
via the low-pressure fluid passage
54
.
On the other hand, in the case of closing the contact
6
of the circuit breaker
5
, that is, carrying out a making or closing operation, in the circuit-breaker fluid pressure operating section
16
, a current is applied to the close electromagnetic coil
51
of the fluid pressure control valve
23
. When the electromagnetic coil
51
is excited, the control valve body is moved to the right-hand side in
FIG. 4
, and then, the directional control valve body
46
makes a reverse switching operation. By doing so, the fluid discharge port
49
is closed, and the fluid feed port
48
and the control port
47
are communicated with each other. As a result, the high-pressure working fluid is fed to the second cylinder chamber
44
of the fluid pressure cylinder
22
, and the acting force of the fluid pressure piston
32
becomes the relation F
1
<F
2
. Therefore, the high-pressure working fluid of the second cylinder chamber
44
drives the fluid pressure piston
32
so that the piston
32
is pushed up, and thereby, the contact
6
of the circuit breaker
5
connected to the piston rod
33
is closed.
By the above breaking and making operations of the circuit breaker
5
, the high-pressure working fluid of the circuit-breaker fluid pressure operating section
16
is consumed, and then, a fluid pressure of the fluid accumulated chamber
58
of the accumulator
24
is reduced. However, in this case, the discharged fluid recovered in the low-pressure tank
27
is fed back from the outlet port
61
to the fluid accumulated chamber
59
of the accumulator
24
, and therefore, the internal fluid pressure of the fluid accumulated chamber
59
rises again.
Further, in the case of making an inspection for the electrical machinery and apparatus, the contact
6
of the circuit breaker
5
is opened, and thereafter, it is possible to open the first contact
8
a
and/or the second contact
8
b
of the disconnecting switches
7
a
and
7
b.
Thus, the switching operation of the first and second contacts
8
a
and
8
b
of the disconnecting switches
7
a
and
7
b
can be carried out in the same manner as the case of the circuit breaker
5
, and further, can be performed independently from each other. More specifically, in the breaking state of the circuit-breaker fluid pressure operating section
16
, in the case of breaking only disconnecting-switch fluid pressure operating section
17
, a signal is given to the open electromagnetic coil
50
a
of the fluid pressure control valve
39
. By doing so, the directional control valve body
46
a
is operated, and thereby, the fluid pressure of the second cylinder chamber
44
a
of the fluid pressure cylinder
37
is reduced. The high-pressure working fluid acts in the first cylinder chamber
43
a.
For this reason, the fluid pressure piston
32
a
is driven so as to open the first contact
8
a.
Conversely, the making or closing operation is carried out in the same manner as the circuit-breaker fluid pressure operating section
16
.
Further, the switching or closing operation of the second contact
8
b
of the disconnecting switch
7
b
is carried out in the same manner as the disconnecting switch
7
a.
In the insulating switch
1
to which the combined type fluid pressure driving apparatus is applied, the following effects can be obtained.
It is possible to switch the contacts
8
a
and
8
b
of the disconnecting switches
7
a
and
7
b
according the same fluid pressure driving method as the driving method for switching the contact
6
of the circuit breaker
5
. Therefore, the fluid pressure driving apparatus can be integrally combined, and the fluid pressure operating sections
16
to
18
of the fluid pressure driving apparatus can be used in common, and can be miniaturized.
Further, the above fluid pressure driving method is employed, and thereby, high output is readily possible, and the fluid pressure cylinders
37
and
38
of the disconnecting-switch fluid pressure operating sections
17
and
18
and the fluid pressure control valves
39
and
40
can be made into a compact size; therefore, it is possible to secure preferable operation reliability. In particular, even in the case where there is a need of cutting off a loop current with respect to the disconnecting switches
7
a
and
7
b
in switching an electric transmission line
53
a
and
53
b,
it is possible to readily make high a switching speed of the contacts
8
a
and
8
b,
and to improve insulation recovery characteristic between the contacts
8
a
and
8
b.
Further, the connecting mechanism sections
14
,
14
a
and
14
b
are received in the metal container
3
, and the insulated operating rods
15
,
15
a
and
15
b
are received in the support porcelain tube
11
; therefore, it is possible to make compact the porcelain tubes
2
,
2
a
and
2
b
even if they are installed in the metal container
3
. As a result, three receiving porcelain tubes
2
,
2
a
and
2
b
can be attached to a single metal container
3
. By doing so, the insulating and switch
1
having the circuit breaker
5
and two disconnecting switches
7
a
and
7
b
can be miniaturized. In addition, it is possible to make small the metal container
3
receiving the connecting mechanism sections
14
,
14
a
and
14
b,
and miniaturization and compact size can be achieved; therefore, it is possible to contribute for making compact the insulating switch
1
, and to greatly reduce the cost.
Further, in the fluid pressure operating device
13
, the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
use the accumulator
24
, the pump
25
, the low-pressure tank
27
and the fluid pressure monitor
26
in common. Therefore, this serves to further integrally combine the fluid pressure driving apparatus, and is effective in a reduction of the number of components and in simplification. In addition, the member attached to the manifold
30
on the disconnecting-switch fluid pressure operating section
16
is removable; therefore, the disassembling work for inspection is simple, and maintenance and inspection can be improved.
[Second embodiment]
The second embodiment of the combined type fluid pressure driving apparatus of the present invention will be described below with reference to FIG.
5
. In this case, like reference numerals are used to designate components having the same function as the above first embodiment, and the details are omitted.
The combined type fluid pressure driving apparatus shown in this second embodiment has the following features. More specifically, in a fluid pressure operating device
13
A, the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
are connected to fluid pressure pipes
67
and
68
, respectively. In other words, the fluid pressure cylinders
37
and
38
for driving the disconnecting switches
7
a
and
7
b
and the fluid pressure control valves
39
and
40
are arranged in a state of separating from the manifold
30
formed in the fluid pressure cylinder
22
for driving the circuit breaker.
In this case, the first cylinder chambers
43
a
and
43
b
of the fluid pressure cylinders
37
and
38
are communicated with the accumulator
24
via the high-pressure pipe
67
together with the fluid feed ports
48
a
and
48
b
of the fluid pressure control valves
39
and
40
, respectively. Simultaneously, the fluid discharge ports
49
a
and
49
b
of the fluid pressure control valves
39
and
40
are connected to the low-pressure tank
27
via the low-pressure pipe
68
, respectively. The fluid pressure driving apparatus constructed as described above has the same operation and function as the first embodiment, and has no different from there; and therefore, the details are omitted.
In the combined type fluid pressure driving apparatus shown in this second embodiment, the fluid pressure operating sections
16
to
18
of the fluid pressure operating device
13
can be freely arranged. In addition, in the same manner as the above first embodiment, these fluid pressure operating sections
16
to
18
can use the fluid pressure accumulator
24
, the pump
25
and the low-pressure tank
27
in common. Therefore, it is possible to readily achieve a design for saving a space, miniaturization and simplification of the fluid pressure driving apparatus. In particular, in accordance with the layout of plural current-applied contacts of the transmission line
53
constituting the gas insulated switchgear, a part or all of the disconnecting-switch fluid pressure operating sections
17
and
18
is arranged at a position far from the circuit-breaker fluid pressure operating section
16
. In this case, the fluid pressure pipes
67
and
68
is formed of a flexible pipe, for example, a flexible hose, and then, the flexible pipes
67
and
68
are merely connected, and thereby, it is possible to obtain the very effective layout of the fluid pressure driving apparatus.
[Third embodiment]
The third embodiment of the combined type fluid pressure driving apparatus of the present invention will be described below with reference to FIG.
6
.
The combined type fluid pressure driving apparatus shown in this third embodiment has an improvement of position holding function of the first contact
8
a
of the disconnecting switch
7
a
shown in FIG.
1
. In the above first and second embodiments, there is a possibility of the switching state of the disconnecting switch contact
8
a
is varied by the following influence. More specifically, the fluid pressure of the high-pressure working fluid drops down for inspection, and the contact
8
a
receives the weight of the fluid pressure piston
32
a
and gas pressure when the fluid pressure loss is generated by large-amount fluid leakage. In view of the above circumstances, for safety, the position holding function of the first contact
8
a
of the disconnecting switch
7
a
is improved so that the switching state of the disconnecting switch contact
8
a
is not varied.
A combined type fluid pressure driving apparatus shown in
FIG. 6
includes a piston holding mechanism
70
for holding a making state of the fluid pressure piston
32
a.
In this case, the configuration other than the piston holding mechanism
70
is the same as the first and second embodiments; therefore, like reference numerals are given, and the details are omitted.
In
FIG. 6
, the fluid pressure piston
32
a
sliding in the fluid pressure cylinder
37
is formed with a circumferential groove
72
at a small-diameter portion of the first cylinder chamber
43
a,
and an operating rod for holding a making position, that is, a lock pin
73
is fitted into the circumferential groove
72
. The lock pin
73
is provided in a lock piston
76
, which is slidably supported to a holding cylinder
75
of the piston holding mechanism
70
. The lock piston
76
is urged by an elastic element provide at its backside, for example, a spring
77
; on the other hand, the high-pressure working fluid from the accumulator
24
(see
FIG. 4
) is supplied to a cylinder chamber
78
opposite to the lock piston
76
.
In a normal operation, the lock piston
76
is pressed into the cylinder chamber by the high-pressure working fluid against a spring force of the spring
77
, and then, the lock pin
73
is held at a retreat position; therefore, the lock pin
73
has no contact with the circumferential groove
72
of the fluid pressure piston
32
a.
However, when the fluid pressure of high-pressure working fluid is lost, the lock piston
76
is projected by the spring force the spring
77
, and then, the distal end portion of the lock pin
73
is fitted into the circumferential groove
72
of the fluid pressure piston
32
a,
and thereafter, is abutted against there. By doing so, the fluid pressure piston
32
a
is held at the making position. Further, the contact
8
a
(see
FIG. 4
) interlocking with the fluid pressure piston
32
a
is kept at a closed state.
On the other hand, in the breaking position (open position) of the fluid pressure piston
32
a,
a piston holding mechanism (not shown) of the fluid pressure piston
32
a
is provided in the same manner as above, and thereby, it is possible to hold the fluid pressure piston
32
a
at the open position.
In
FIG. 6
, the disconnecting switch
7
a
has been described as an example. The same piston holding mechanism is applicable to the fluid pressure pistons
32
b
and
32
of the disconnecting switch
7
b
and the circuit breaker
5
.
According to this third embodiment, even if the fluid pressure of the combined type fluid pressure driving apparatus is lost, it is possible to securely hold the switching state of the contact
8
a
of the disconnecting switch
7
a,
and to improve reliability for safety of the fluid pressure driving apparatus.
[Fourth embodiment]
FIG. 7
is a view partially showing a configuration of principal parts of combined type fluid pressure driving apparatus according to a fourth embodiment of the present invention.
In this fourth embodiment, improvement is made in the position holding function of the contact
8
a
of the disconnecting switch
7
a
like the above third embodiment.
A combined type fluid pressure driving apparatus shown in
FIG. 7
is provided with a toggle joint mechanism
80
, which interlocks with the piston rod
33
a
or the driving rod
34
a
of the fluid pressure piston
32
a.
In this case, the configuration other than the toggle device
80
is the same as the first and second embodiments; therefore, like reference numerals are given, and the details are omitted.
The toggle device
80
is provided with a support portion
81
, which is fixed on the attachment frame
20
a
supporting the fluid pressure cylinder
37
(see FIG.
4
). The toggle device
80
is interposed between the support portion
81
and a flange
82
integrally provided on the driving rod
34
a.
Further, the toggle joint mechanism
80
includes a telescopic mechanism or an expansible rod mechanism
83
, which is expansibly held, and an elastic element for urging an operating rod
84
of the expansible rod mechanism
83
, for example, a spring
85
.
In
FIG. 7
, the driving rod
34
a
of the disconnecting switch
7
a
has been described as an example. The same toggle mechanism is applicable to the fluid pressure pistons
34
b
of the disconnecting switch
7
b
and the driving rod
34
of the circuit breaker
5
.
According to this fourth embodiment, it is possible to securely hold the making position or the breaking position of the fluid pressure piston
32
a
by the spring force (spring load) of the spring
85
regardless of the fluid pressure of the high-pressure working fluid. Further, it is possible to visibly confirm the switching state of the contact
8
a
from the outside, and thus, the inspection can be readily carried out.
[Fifth embodiment]
The fifth embodiment of combined type fluid pressure driving apparatus according to of the present invention will be described below with reference to FIG.
8
.
In this fifth embodiment, improvement is made in the position holding function of the contact
8
a
of the disconnecting switch
7
a
of the combined type fluid pressure driving apparatus, like the above third and fourth embodiments.
The combined type fluid pressure driving apparatus shown in
FIG. 8
is provided with a rod lock mechanism
88
, which locks the driving rod
34
a
or the piston rod
33
a
in the making or breaking state of the disconnecting switch
7
a.
In this case, the configuration other than the rod lock mechanism
88
is the same as the first and second embodiments; therefore, like reference numerals are given, and the details are omitted.
As shown in
FIG. 8
, the rod lock mechanism
88
is constructed in the following manner. More specifically, a bracket
89
extending from the attachment frame
20
a
faces the driving rod
34
a,
and the bracket
89
and the driving rod
34
a
are individually formed with through holes
90
and
91
. In this case, these through holes
90
and
91
are formed so that they are aligned with each other in the making position or the breaking position of the fluid pressure piston
32
a
(see FIG.
4
). When these through holes
90
and
91
are overlapped and aligned with each other, a lock pin
92
is inserted into these through holes
90
and
91
, so as to lock the driving rod
34
a,
and thereby, the fluid pressure piston
32
a
can be held at the making or breaking position.
In
FIG. 8
, the driving rod
34
a
of disconnecting switch
7
a
has been described as an example. The same rod lock mechanism is applicable to the fluid pressure pistons
34
b
of the disconnecting switch
7
b
and the driving rod
34
of the circuit breaker
5
.
According to this fifth embodiment, the rod lock mechanism
88
is used, that is, the lock pin
92
is inserted into the aligned through holes
90
and
91
, and thereby, it is possible to securely hold the position of the fluid pressure piston
32
a,
and to readily hold the position of the fluid pressure piston
32
a
by manual. Further, inspection can be confirmed readily and visibly; therefore, it is possible to further improve safety and reliability.
[Sixth embodiment]
FIG.
9
and
FIG. 10
show a combined type fluid pressure driving apparatus according to a sixth embodiment of the present invention.
This sixth embodiment detailedly shows a configuration of the disconnecting-switch fluid pressure operating section
17
(
18
).
FIG. 9
is a front sectional view showing a configuration of the disconnecting-switch fluid pressure operating section
17
, and
FIG. 10
is a side sectional view thereof. The other disconnecting-switch fluid pressure operating section is applied in the same manner as above. In this case, like reference numerals are used to designate components having the same function as the first and second embodiments, and the details are omitted.
In the disconnecting-switch fluid pressure operating section
17
shown in
FIG. 9
, The fluid pressure cylinder
37
slidably receiving the fluid pressure piston
32
a
and one end side of concentrically outer cylinder
95
coaxially arranged on the outer peripheral side of the fluid pressure cylinder
37
are inserted into a block-like cylinder head
96
, and then, are fixed thereto. The cylinder head
96
supports slidably the piston rod
33
a
extending from the fluid pressure piston
32
a,
and is fixed to the frame
20
a
of the mechanical box
12
as shown in FIG.
2
.
Further, the fluid pressure control valve
39
is provided above the cylinder head
96
, and the other end of the outer cylinder
95
is attached with a plug
97
for sealing a working fluid. A substantially concentric cylinder structure is formed by the fluid pressure cylinder
37
and the outer cylinder
95
, and further, a gap between the above cylinders, that is, an annular space is used as a control fluid passage
98
, which communicates the fluid pressure control valve
39
with the second cylinder chamber
44
a
of the fluid pressure cylinder
37
. The first cylinder chamber
43
a
of the fluid pressure cylinder
37
communicates with the fluid pressure control valve
39
via a fluid passage
99
formed in the cylinder head
96
.
The fluid pressure control valve
39
includes a valve block
100
as shown in FIG.
10
. The valve block
100
includes a control port
47
a,
a fluid feed port
48
a
and a fluid discharge port
49
.
The following is a description of each function of the ports included in the fluid pressure control valve
39
.
More specifically, the control port
47
a
selectively feeds or discharges a high-pressure working fluid to and from the second cylinder chamber
44
a
of the fluid pressure cylinder
37
connected to the control fluid passage
98
. The fluid feed port
48
a
communicates with the accumulator
24
and the first cylinder chamber
43
a
of the fluid pressure cylinder
37
via the high-pressure fluid passage
45
a.
The fluid discharge port
49
a
is connected to the low-pressure tank
27
via the low-pressure fluid passage
54
a.
Further, the valve block
100
includes a directional control valve body
46
a
of the fluid pressure control valve
39
for selectively switching the control port
47
a
into the fluid feed port
48
a
or the fluid discharge port
49
a.
The directional control valve body
46
a
carries out the port switching operation in the following manner; more specifically, a push rod
101
is driven by an electromagnetic force of the open electromagnetic coil
50
a
and the close electromagnetic coil
51
a
arranged on both sides of the valve block
100
.
On the other hand, the fluid pressure control valve
39
is included in the cylinder head
96
so that the operating axis of the directional control valve body
46
a
and the operating axis fluid pressure piston
32
a
are perpendicular to each other.
The cylinder head
96
is provided with a piston holding mechanism
70
for holding a making state of the fluid pressure piston
32
a,
as shown in
FIG. 6
described in the above third embodiment.
Moreover, the fluid pressure piston
32
a
is formed with a breaking damper piston
102
and a making damper piston
103
at its both sides. In the termination of open operation, the breaking damper piston
102
is fitted into the plug
97
, and thereby, an open damper chamber
104
is formed. When the breaking damper piston
102
is inserted into the open damper chamber
104
, the internal pressure of the damper chamber
104
increases, and thereby, the fluid pressure piston
32
a
is damped, and tend, is stopped. Likewise, in the termination of close operation, the making damper piston
103
is fitted into a part of the cylinder head
96
, and thereby, a close damper chamber
105
is formed so that the fluid pressure piston
32
a
is smoothly stopped.
The disconnecting-switch fluid pressure operating section
17
(
18
) constructed as described above has the same operation and function as the above embodiments; therefore, the explanation is omitted.
According to this sixth embodiment, the following effects can be obtained.
In the disconnecting-switch fluid pressure operating section
17
, the fluid pressure control valve
39
is included in the cylinder head
96
at the upper end portion of the operating section so that the operating axis of the directional control valve
46
a
and the operating axis fluid pressure piston
32
a
are perpendicular to each other. Therefore, there is no need of attaching structures other than the plug
97
for sealing a working fluid to the lower end portion of the disconnecting-switch fluid pressure operating section
17
; as a result, this serves to realize a simple structure.
Further, the fluid pressure control valve
39
having a relatively heavy weight is arranged on the position near to the attachment frame
20
a,
which is an upper fixed point. Therefore, even if an external force such as vibration by the operation of the fluid pressure control valve
39
and vibration by the operation of the circuit-breaker fluid pressure operating section
16
having a relatively large driving force acts, no excessive vibration is generated in the fluid pressure cylinder
37
. As a result, it is possible to provide a structure excellent in vibration proofing and strength. In particular, the lower end portion of the disconnecting-switch fluid pressure operating section
17
is light, so that it can be readily attached in the horizontal direction. Therefore, there is no limitation in attachment direction, and a degree of freedom of layout is improved.
Further, the directional control valve
46
a
of the fluid pressure control valve
39
and the fluid pressure piston
32
a
are perpendicular to each other in its operating direction. Therefore, even if an external force such as vibration by the operation of the fluid pressure piston
32
a
and vibration by the operation of the circuit-breaker fluid pressure operating section
16
having a relatively large driving force acts onto the operating axis of the fluid pressure piston
32
a,
an erroneous operation of the directional control valve
46
a
can be prevented. As a result, it is possible to realize a structure excellent in reliability.
On the other hand, in the making and breaking operations of the fluid pressure piston
32
a
of the disconnecting-switch fluid pressure operating section
17
, the fluid passage is required for feeding and discharging a high-pressure working fluid to the second cylinder chamber
44
a
of the fluid pressure cylinder
37
via the fluid pressure control valve
39
. In this sixth embodiment, a double cylindrical structure is formed by the fluid pressure cylinder
37
and the outer cylinder
95
coaxially provided so as to cover the cylinder
37
, and then, a gap between two cylinder is used as the control fluid passage
98
. Therefore, the control fluid passage
98
is arranged concentrically with the fluid pressure cylinder
37
; as a result, this is advantageous to simplify the structure and to save a space as compared with the case where the control fluid passage is arranged separately.
[Seventh embodiment]
FIG. 11
shows a combined type fluid pressure driving apparatus according to a seventh embodiment of the present invention.
This seventh embodiment relates to a detailed structure of the disconnecting-switch fluid pressure operating section
17
(
18
), like the sixth embodiment.
FIG.
11
(A) and
FIG. 11B
are individually a front sectional view and a side view showing the disconnecting-switch fluid pressure operating section
17
, and in this case, like reference numerals are used to designate components having the same function as the first and second embodiments, and the details are omitted.
In the disconnecting-switch fluid pressure operating section
17
shown in
FIG. 11
, the fluid pressure piston
32
a
is slidably received in the fluid pressure cylinder
37
, and the outer cylinder
95
is concentrically arranged so as to cover the outer peripheral side of the fluid pressure cylinder
37
. One end of the fluid pressure cylinder
37
and the outer cylinder
95
is inserted and fixed to the block-like cylinder head
96
. The cylinder head
96
is fixed to the attachment frame
20
a
of the mechanical box
12
as shown in FIG.
2
. The other end of the fluid pressure cylinder
37
and the outer cylinder
95
is provided with the fluid pressure control valve
39
, and the valve block
100
is attached as a member for sealing a working fluid.
A double cylindrical structure is formed by the fluid pressure cylinder
37
and the outer cylinder
95
, and a gap between two cylinders is used as a high-pressure fluid passage
110
communicating with the fluid pressure control valve
39
and the first cylinder chamber
43
a
of the fluid pressure cylinder
37
. The cylinder head
96
is provided with the piston holding mechanism
70
for holding a making sate of the fluid pressure piston
32
a,
like the sixth embodiment.
The valve block
100
of the fluid pressure control valve
39
includes the fluid feed port
48
a,
the fluid discharge port
49
a
and the control port
47
a,
like the above sixth embodiment. More specifically, the fluid discharge port
49
a
is connected to the high-pressure fluid passage
110
formed between the double cylindrical gap, and the control port
47
a
selectively feeds or discharges a high-pressure working fluid to and from the second cylinder chamber
44
a
of the fluid pressure cylinder
37
. Further, the valve block includes the directional control valve body
46
a
of the fluid pressure control valve
39
for selectively switching the control port
47
a
into the fluid feed port
48
a
or the fluid discharge port
49
a.
The directional control valve body
46
a
is driven via a push rod
101
by an electromagnetic force of the open electromagnetic coil
50
a
and the close electromagnetic coil
51
a
arranged on both sides of the valve block
100
.
The fluid pressure control valve
39
is attached so that the operating axis of the directional control valve body
46
a
and the operating axis of the fluid pressure piston
32
a
are perpendicular to each other. The fluid pressure driving apparatus constructed as described above has the same operation and function as the above embodiments; therefore, the explanation is omitted.
According to this sixth embodiment, the following effects can be obtained.
In the disconnecting-switch fluid pressure operating section
17
, the fluid pressure control valve
39
is attached to at the lower end portion of the operating section so that the operating axis of the directional control valve
46
a
and the operating axis fluid pressure piston
32
a
are perpendicular to each other. There is a need of attaching a member for sealing a working fluid to the lower end portion of the disconnecting-switch fluid pressure operating section
17
. However, the valve block
100
of the fluid pressure control valve
39
is used in common as the above member, and thereby, the number of components is reduced, and the structure can be simplified. In addition, the valve block
100
is arranged on the cylindrical cross section of the outer cylinder
95
; therefore, a compact design can be achieved without extending the member to a radius direction.
Further, in the case of discharging a high-pressure working fluid from the second cylinder chamber
44
a
of the fluid pressure cylinder
37
via the fluid pressure control valve
39
, the fluid path is short; therefore, pressure loss is small, and the open operation is carried out at a high speed.
Further, the directional control valve body
46
a
of the fluid pressure control valve
39
and the fluid pressure piston
32
a
are perpendicular to each other in the operating direction. Therefore, even if an external force such as vibration by the operation of the fluid pressure piston
32
a
and vibration by the operation of the circuit-breaker fluid pressure operating section
16
having a relatively large driving or operating force acts onto the operating axis of the fluid pressure piston
32
a,
an erroneous operation of the directional control valve body
46
a
can be prevented. As a result, it is possible realize a structure excellent in reliability.
Further, the high-pressure fluid passage
110
connects the first cylinder chamber
43
a
of the fluid pressure cylinder
37
positioned on the upper end portion of the disconnecting-switch fluid pressure operating section
17
with the fluid feed port
48
a
of the fluid pressure control valve
39
provided on the lower end portion thereof. The high-pressure fluid passage
110
is formed by the fluid pressure cylinder
37
and the outer cylinder
95
concentrically provided so as to cover the outer peripheral surface of the cylinder
37
, and then, the gap between the double cylindrical structure is used as an annular high-pressure fluid passage
110
. In this case, the high-pressure fluid passage
110
is arranged coaxially with the fluid pressure cylinder
37
; therefore, it is advantageous to simplify the structure, and to save a space as compared with the case where the fluid passage is arrange separately.
[Eighth embodiment]
FIG.
12
and
FIG. 13
show a combined type fluid pressure driving apparatus according to an eighth embodiment of the present invention.
FIG. 12
is a view schematically showing a fluid pressure circuit of combined type fluid pressure driving apparatus according to the eighth embodiment. The combined type fluid pressure driving apparatus shown in the eighth embodiment is provided with a connector having at least one or more switching valve or check valve. The connector is arranged on the midway of high-pressure and low-pressure fluid passages connecting the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
of the fluid pressure operating device
13
. In the explanation of the combined type fluid pressure driving apparatus, like reference numerals are used to designate the same components or parts having the same function as the above embodiments, and the details are omitted.
The combined type fluid pressure driving apparatus shown in
FIG. 12
is constructed in the following manner. More specifically, like the fluid pressure driving apparatus of the second embodiment, the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating sections
17
and
18
are connected by the high-pressure pipe
67
and the low-pressure pipe
68
, and then, connectors
112
a,
112
b;
113
a,
113
b
with check valve are provided on the midway. The high-pressure pipe
67
and the low-pressure pipe
68
are formed of a flexible pipe, for example, a flexible hose. The connector
112
a
attached to the hose end portion of the high-pressure pipe
57
and the connector
112
a
attached to the fluid feed port
48
a
of the fluid pressure control valve
39
are removable by one touch.
According to this eighth embodiment, the effect is exhibited in the case where the fluid pressure of combined type fluid pressure driving apparatus is reduced, and as a result, the driving apparatus falls into no-operating state.
For example, in the case where fluid-tightness is worse in the disconnecting-switch fluid pressure operating section
17
, it is possible to separate the disconnecting-switch fluid pressure operating section
17
having failure from the fluid pressure circuit. In other words, the high-pressure pipe
67
and the low-pressure pipe
68
are both removed from the fluid pressure control valve
39
together with the connectors
112
a
and
113
a.
In this case, the check valve is attached to these connectors
112
a
and
113
a,
and thereby, it is possible to prevent the working fluid from flowing into the outside, and to keep the fluid-tightness of the portion. Further, it is possible to remove only disconnecting-switch fluid pressure operating section
17
in order to carry out the inspection and repair work, and to replace it with a new component. If necessary, it is possible to continue operating the circuit-breaker fluid pressure operating section
16
and the disconnecting-switch fluid pressure operating section
17
still having preferable function.
On the other hand,
FIG. 13
shows a fluid pressure circuit in the following case. More specifically, a failure happens in the circuit-breaker fluid pressure operating section
16
, the accumulator
24
and the pump
25
, and the connection with the disconnecting-switch fluid pressure operating section
17
,
18
is disconnected. Thereafter, a high-pressure hose
116
and a low-pressure hose
117
of an auxiliary fluid pressure source
115
are connected to the connectors
112
a
and
113
a
of the disconnecting-switch fluid pressure operating section
17
, respectively.
As shown in
FIG. 13
, the auxiliary fluid pressure source
115
is connected from the outside, and thereby, it is possible to recover the fluid pressure of the combined type fluid pressure driving apparatus even if a failure happens in the disconnecting-switch fluid pressure operating section
17
, the accumulator
24
and the pump
25
.
Further, the auxiliary fluid pressure source
115
includes at least electrically operated or manual pump
118
. As the need arises, an auxiliary accumulator
120
and an auxiliary tank
121
may be added. In particular, in the case of opening the disconnecting switch
7
a,
there is the case where a relatively high-speed operation is required for loop current cutoff. In emergency case, there is a need of previously providing the auxiliary accumulator
120
for storing a certain amount of high-pressure fluid.
In place of the connector, even when the switching valve is used, the same effect as above can be obtained. In particular, in the case of the switching valve, the fluid passage for connecting the circuit-breaker fluid pressure operating section
16
with the disconnecting-switch fluid pressure operating section
17
is not limited to a flexible pipe, and may be the fluid passage formed in the block as shown in FIG.
4
.
According this eighth embodiment, the following effect can be obtained even if the fluid pressure of combined type fluid pressure driving apparatus is reduced, and as a result, the driving apparatus falls into no-operating state. More specifically, it is possible to provide the combined type fluid pressure driving apparatus, which can readily perform various works such as inspection and repair of the fluid pressure operating section, replacement work and recovery work of fluid pressure without stopping the transmission line.
[Other embodiments]
The first to eighth embodiments of the present invention have been described above. The present invention is not limited to the above embodiments. For example, the configuration described in the third to fifth embodiments may be combined and applied.
According to the embodiment, it is possible to further improve safety. In the above embodiments, the insulating switch
1
has been described as target. The present invention is applicable to a small-size switchgear receiving the contact of the circuit breaker and the disconnecting switch in the metal container, and not the porcelain tube, and the same operation and effect as above can be obtained.
As is evident from the above description, according to the present invention, in the combined type fluid pressure driving apparatus, each contact of both circuit breaker and disconnecting switches and the circuit breaker is switched and driven by the fluid pressure drive. By doing so, it is possible to provide a switchgear, which can achieve miniaturization and simplification while securing high operation reliability, and excellent in assembly, operability and inspection, and further, has a compact size.
Claims
- 1. A combined type fluid pressure driving apparatus comprising:a metal container including a hollow support insulator and a plurality of hollow receiving insulators, wherein said metal container, hollow support insulator, and hollow receiving insulators are sealed with insulating gas; circuit breaker and disconnecting switches each having a stationary electrode fixed in each of the hollow receiving insulators and a movable electrode accommodated therein so as to be separated from or contacted to the stationary electrode, said circuit breaker and disconnecting switches having contacts, respectively; insulated operating rods accommodated in the hollow support insulator and operatively connected to the movable electrodes of the circuit breaker and the disconnecting switches; a mechanical box arranged at an end of the hollow support insulator; a fluid pressure operating device received in the mechanical box and driven by fluid pressure, said fluid pressure operating device comprising: a plurality of fluid pressure cylinders switching and driving the contacts of the circuit breakers and the disconnecting switches, respectively; a plurality of fluid pressure control valves for independently driving the fluid pressure cylinders; an accumulator for storing a high-pressure working fluid supplied commonly to the fluid pressure cylinders and fluid pressure control valves; a pump for supplying the high-pressure working fluid into the accumulator; and a tank for storing a low-pressure fluid discharged from the fluid pressure cylinders; and a connecting mechanism disposed in the metal container, wherein an operating force of the fluid pressure operating device is transmitted to the movable electrodes of the circuit breakers and the disconnecting switches through the insulation operating rods and the connecting mechanism so that each contact of the circuit breaker and the disconnecting switches is switched.
- 2. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device further includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch; and a manifold forming the fluid pressure cylinder at the circuit-breaker fluid pressure operating section, and the manifold is removably attached with the accumulator, the pump, the low-pressure tank and the disconnecting-switch fluid pressure operating section.
- 3. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section and the disconnecting-switch fluid pressure operating section are connected with each other as a fluid pipe.
- 4. The combined type fluid pressure driving apparatus according to claim 1, wherein the apparatus is provided with a piston holding mechanism, which holds a position of fluid pressure piston sliding in each of the fluid pressure cylinders when the high-pressure working fluid of the accumulator is lost.
- 5. The combined type fluid pressure driving apparatus according to claim 1, wherein the driving apparatus further includes: a driving rod extending from a fluid pressure piston fixed integrally with a flange; an expansible rod mechanism for expansibly connecting a support member fixed in the mechanical box with the flange; and an elastic element for elastically holding a position of the fluid pressure piston by an operating rod of the expansible rod mechanism.
- 6. The combined type fluid pressure driving apparatus according to claim 1, wherein the driving rod extending from the fluid pressure piston and a support bracket fixed in the mechanical box are individually formed with an attachment hole aligned with each other, and a lock pin is inserted into the attachment hole aligned, and thereby, a mechanism for holding the position of the fluid pressure piston is constructed.
- 7. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and a piston rod extending from the fluid pressure piston of the disconnecting-switch fluid pressure operating section is slidable, and a cylinder head fixed to one end of the fluid pressure cylinder is arranged in the mechanical box, and further, the cylinder head is attached with a fluid pressure control valve.
- 8. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and an outer cylinder is concentrically arranged on an outer side of the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section so as to form a double cylindrical structure, and further, an annular gap between the double cylindrical structure is used as a control fluid passage for feeding and discharging a high-pressure working fluid to and from a cylinder chamber of the fluid pressure cylinder.
- 9. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section is attached to the cylinder head fixed in the mechanical box, and further, the fluid pressure control valve is arranged on the opposite side of the cylinder head to the fluid pressure cylinder.
- 10. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and one end of the fluid pressure cylinder of disconnecting-switch fluid pressure operating section is attached to the cylinder head fixed in the mechanical box, and the fluid pressure control valve is provided on the opposite side of the cylinder head to the fluid pressure cylinder while an outer cylinder is concentrically arranged on an outer side of the fluid pressure cylinder of the disconnecting-switch fluid pressure operating section so as to form a double cylindrical structure, and further, an annular gap between the double cylindrical structure is used as a high-pressure fluid passage for always supplying a high-pressure fluid from the accumulator to the cylinder chamber of the fluid pressure cylinder.
- 11. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and a piston rod extending from the fluid pressure piston of the disconnecting-switch fluid pressure operating section is slidable, and a cylinder head fixed to the fluid pressure cylinder is fixed in the mechanical box, and further, the cylinder head is attached with a fluid pressure control valve so that an operating axis of the fluid pressure control valve and an operating axis of the fluid pressure piston are perpendicular to each other.
- 12. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and at least one or more switching valve is provided on the midway of high-pressure and low-pressure fluid passages for connecting the circuit-breaker fluid pressure operating section with the disconnecting-switch fluid pressure operating section.
- 13. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and high-pressure and low-pressure fluid passages for connecting the circuit-breaker fluid pressure operating section with the disconnecting-switch fluid pressure operating section are formed of a flexible pipe, and further, a connector with at least one or more check valve is provided on the midway thereof.
- 14. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section or the disconnecting-switch fluid pressure operating section is connectable with an auxiliary fluid pressure source including at least one or more electrically-operated or manual pump.
- 15. The combined type fluid pressure driving apparatus according to claim 1, wherein the fluid pressure operating device includes: a circuit-breaker fluid pressure operating section for switching and driving a contact of the circuit breaker; and a disconnecting-switch fluid pressure operating section for switching and driving a contact of the disconnecting switch, and the circuit-breaker fluid pressure operating section or the disconnecting-switch fluid pressure operating section includes an auxiliary fluid pressure source including at least one or more electrically-operated or manual pump, and the auxiliary fluid pressure source is provided with an electrically-operated or manual pump, an auxiliary accumulator for storing a high-pressure fluid and an auxiliary tank for storing a low-pressure fluid.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2000-370463 |
Dec 2000 |
JP |
|
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3823286 |
Thurk et al. |
Jul 1974 |
A |
4365126 |
Oshima et al. |
Dec 1982 |
A |