Information
-
Patent Grant
-
6247910
-
Patent Number
6,247,910
-
Date Filed
Wednesday, September 8, 199924 years ago
-
Date Issued
Tuesday, June 19, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
-
CPC
-
US Classifications
Field of Search
US
- 418 551
- 029 464
- 029 888022
-
International Classifications
- F04C1804
- B23Q318
- B23P1500
-
Abstract
In a scroll type compressor in which a front housing (46) closes an open end of a easing (2) to define a hollow space, a filed scroll member and a movable scroll member are placed in the hollow space. The front housing has a plurality of holes (4d) for inserting therethrough bolts. One of the casing and the filed scroll member has a plurality of threaded hole portions (2d) and a plurality of non-threaded hole portions (2f) extended from extended ends of the threaded hole portions. The threaded hole portions are for engagement with the bolts inserted into the holes of the front housing. The non-threaded hole portions are for receiving end portions of positioning jigs (60) for an alignment of the front housing relative to the casing with a relative angular degree with each other so that at least one pair of the holes of the front housing and the non-threaded hole portions are used for positioning the front housing and the casing.
Description
BACKGROUND OF THE INVENTION
The present invention relates in general to a scroll type compressor and a method of manufacturing the scroll type compressor more particularly to a scroll type compressor which is assembled by conforming all parts and elements in the assembly procedure and the assembly method thereof.
Such a first conventional scroll type compressor is disclosed In Japanese Patent No. 2,713,652 and is shown in
FIG. 5
of the attached drawing. The conventional scroll type compressor has a housing
1
formed by separately assembling each part thereof. The housing
1
has a cup-shaped casing
2
, a front case
4
which is coupled with the cup-shaped casing
2
by a bolt
3
and closes one end of the casing
2
, and a front cover
6
coupled to the front case
4
by a bolt
5
. The front cover
6
has a cylindrical axial hole
6
a
at Its central portion and a rotational shaft
7
which is extended through the axial hole
6
a
is rotatably supported by the housing
1
through bearings
8
and
9
.
In a hollow space defined by the housing
1
, a fixed scroll member
10
and a movable scroll member
14
are provided. The fixed scroll member
10
has an end plate
11
and an involute wrap
12
which is astended from and provided on an inner surface of the end plate
11
. An outer circumferential surface of the and plate
11
is closely contacted with an inner circumferential surface of the casing
2
through a sealing ring
35
to thereby provide a partition for the interior of the housing
1
. So that, a discharge cavity
31
is confined on the outer side of the and plate
11
, a suction chamber
32
being confined on the inner side of the end plate
11
. The fixed scroll member
10
is fixed to the casing
2
by the bolts
13
which are inserted through the holes
33
of a bottom
2
a
of the casing
2
and threadedly engaged with threaded hole
34
of the end plate
The movable scroll member
14
, on the other hand, has an end plate
15
and an involute wrap
16
which is extended from and provided on the inner surface of the end plate
15
. The involute wrap
16
of the movable scroll member
14
is substantially same in configuration as the involute wrap
12
of the fixed scroll member
10
.
The movable scroll member
14
and the fixed scroll member
10
are eccentrically offset by a predetermined distance with each other and are offset at 180° and engaged with each other as illustrated in
FIG. 5. A
tip seal
17
is embedded in a front end portion of the involute wrap
12
. The tip seal
17
is closely contacted with the inner surface of the end plate
15
. Similarly, a tip seal
18
to embedded in a front end portion of the involute wrap
16
. The tip seal
18
is closely contacted with the inner surface of the and plate
11
. The side surfaces of the involute wraps
12
and
16
are line-contacted with each other at a plurality of locations on the side surfaces. Thus, a plurality of sealed chambers
19
a
and
19
b
are confined in a point-symmetrical relation relative to a center of the involute curve.
The end plate
15
is provided at its central portion a cylindrical boss
20
in which a bush
21
is rotatably mounted through an orbital bearing
23
. The bush
21
is provided with an eccentric hole
24
in which an eccentric pin
25
, which is disposed to an inner end of the rotational shaft
7
, is rotatably fitted. A balance weight
27
is fixed to the bush
21
. A rotation prevention mechanism
26
comprises an Oldham ring and a thrust pad member
36
and to provided between an outer circumferential end of the outer surface of the end plate
15
and the end surface of the front case
4
.
When the rotational shaft is driven, the movable scroll member
14
is driven through an orbital driving mechanism consisting of the eccentric pin
25
, bush
21
, orbital bearing
23
, boss
20
, and others. In this event, the movable scroll member
14
is subject to an orbital motion with its rotating motion being prevented by the rotation prevention mechanism
26
.
By the orbital motion of the movable scroll member
14
, an line-contact portion between the two involute wraps
12
and
16
is shifted toward a center of the involute (spiral-shaped) structure of the wraps. Consequently, the sealed small chambers
19
a
and
19
b
are moved toward the center of the Involute with their volume decreasing.
Then, gas is sucked into a suction chamber
32
through a suction port (not shown) and introduced into the sealed small chambers
19
a
and
19
b
through an outer and opening portion relative to the involute wraps
12
and
16
and delivered into the center chamber
22
while it is compressed. Then the compressed gas is fed through a discharge port
29
, which is fitted to the end plate
11
of the fixed scroll member
10
, to forcibly open a discharge valve
30
and then fed into a discharge cavity
31
and, finally discharged out of the housing
1
through a discharge port (not shown).
The casing
2
has at its open end portion a flange portion
2
c
which has a plurality of threaded holes
2
d
for engagement with bolts
3
and a first positioning hole
53
. The front case
4
is provided with a flange portion
4
a
coupled with the flange portion
2
c
of the casing
2
. The _flange portion
4
a
of the front case
4
has a plurality of holes
4
d
for receiving bolts
3
and a second positioning hole
54
. The second positioning hole
54
can be matched with the first positioning hole
53
only in the case that a relation between the casing
2
and the front case
4
occupies a predetermined relative angle.
In a method of assembly of or manufacturing the scroll type compressor, a front cover
6
, the movable scroll member
14
, the orbital driving mechanism, the rotation prevention mechanism
26
, the thrust pad member
36
, and others are mounted to the front casing
4
. The movable scroll member
14
and the front case
4
are assembled in a regular relative angle with each other.
The fixed scroll member
10
is inserted into the casing
2
through its one end opening. The casing
2
and the fixed scroll member
10
are coupled together by the bolts
13
so that the casing
2
and the fixed scroll member
10
are coupled together in a regular relative angle with each other.
Then, as shown in
FIG. 6
, a positioning rod
55
is inserted into the hole
53
of the housing assembly
51
and the hole
54
of the front case assembly
52
so that the holes
53
and
54
are aligned with each other. Then, the flange portion
4
a
of the front case
4
is fitted by means of the bolt
3
.
Another conventional scroll type compressor is shown in
FIGS. 7 and 8
. The casing
2
is coupled with the front housing
46
by means of the bolt
3
which is shown in FIG.
5
. Namely, the front housing
46
is a unitary portion consisted with the front case
4
and the front cover
6
shown in FIG.
5
.
The front housing
46
is provided, at its outer circumferential portion, with a plurality of flange portions
4
a
an shown in FIG.
5
. The flange portion
4
a
is provided with a plurality of holes
4
d
for the bolts
3
. The casing
2
is provided at its outer circumferential portion with a plurality of flange portion
2
c
and the flange portion
2
c
has a plurality of threaded hole
2
d
for the bolts
3
.
One of the flange portions
2
c
of the opening end of the casing
2
has a hole
53
which constitute a first positioning portion. The flange portion
4
a
of the front housing
46
has the hole
54
as a second positioning portion such that the hole
53
as the first positioning portion is aligned with the hole
54
of the second positioning portion only when the casing
2
on which the fixed scroll member
10
is mounted has a predetermined relative angular degree with respect to the font housing
46
on which movable scroll member
14
, orbital motion mechanism, rotation prevention mechanism
26
are mounted.
By inserting the positioning rod
55
into the hole
54
of the front housing
46
and the hole
53
of the casing
2
, the holes
53
and
54
are aligned with each other. Then, the flange portion
4
a
of the front housing
46
is coupled with the casing
2
by using the bolts
3
.
With reference to
FIGS. 9 and 10
, the casing
2
and the fixed scroll member
10
are coupled together by engaging the and portion of the bolt
13
with the threaded hole
34
of the end plate
11
, the bolt being inserting through holes
33
of the bottom of the casing
2
.
In this case, the positioning rods
55
,
56
are used for commonly positioning the hole
53
of the casing
2
and the hole
11
a
of the involute wrap
12
of the fixed scroll member
10
so that both the casing
2
and the fixed scroll member
10
are positioned and then the bolts
13
are used to couple the casing
2
and the fixed scroll member
10
together and assembled in a regular relative angular position.
In the conventional scroll type compressors discussed above, a number of holes for positioning purposes are provided in elements and parts thereof such as holes
11
a
,
53
,
54
, but each of these holes serves no more than positioning function. Therefore, these holes are useless any more after assembly in finished.
Further, in order to provide the positioning holes
11
a
,
53
and
54
, the flange portions
2
c
and
4
a
are first provided for these positioning holes and steps for forming these holes are necessary. Consequently, materials for the housing as well as the number of steps for production are increased inevitably.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a scroll type compressor which requires no flange portions or holes for solely positioning purposes and which can reduce manufacturing steps and production cost.
It is another object of the present invention to provide a method of manufacturing the scroll type compressor described above.
Other objects of the present invention will become clear as the description proceeds.
According to an aspect of the present invention, there is provided a scroll type compressor which comprises a casing having an open and, a front housing closing the open and of the casing to define a hollow space in cooperation with the casing, and a fixed scroll member and a movable scroll member placed in the hollow space. The scroll members both have involute wraps and end plates fixed to axial ends of the involute wraps, respectively. The fixed scroll member is fixed to the casing. The involute wrap of the movable scroll member is inserted into the involute wrap of the fixed scroll member with an offset of a predetermined angular degree. The scroll type compressor further comprises an orbital driving mechanism coupled to the movable scroll member for driving the movable scroll member to have an orbital motion without causing a rotating motion thereof. The front housing has a plurality of holes for inserting therethrough bolts. One of the casing and the fixed scroll member has a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of the threaded hole portions. The threaded hole portions are for engagement with the bolts inserted into the holes of the front housing. The non-threaded hole portions are for receiving end portions of positioning jigs for an alignment of the front housing relative to the casing with a relative angular degree with each other so that at least one pair of the holes of the front housing and the non-threaded hole portions are used for positioning the front housing and the casing.
According to another aspect of the present invention, there is provided a method of manufacturing a scroll type compressor which comprises a casing having an open end, a front housing closing the open end of the casing to define a hollow space in cooperation with the casing, and a fixed scroll member and a movable scroll member placed in the hollow space. The both have involute wraps and end plates fixed to axial ends of the involute wraps, respectively. The fixed scroll member is fixed to the casing. The involute wrap of the movable scroll member is inserted into the involute wrap of the fixed scroll member with an offset of a predetermined angular degree. The scroll type compressor further comprises an orbital driving mechanism coupled to the movable scroll member for driving the movable scroll member to have an orbital motion without causing a rotating motion thereof. The front housing has a plurality of holes for inserting therethrough bolts. One of the casing and the fixed scroll member has a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of the threaded hole portions. The method comprises the steps of inserting positioning jigs into at lease one pair of the holes of the front housing and the non-threaded hole portions to make an alignment between the casing and the fixed scroll member, inserting the bolts into the holes of the front housing, and engaging the bolts with the threaded hole portions to thereby providing a firm coupling between the casing and the fixed scroll member.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1
is a side view of a front housing of a scroll type compressor according to a preferred embodiment of the invention;
FIG. 2
is a sectional view of the front housing, taken along line II—II of
FIG. 1
;
FIG. 3
is a side view of the scroll type compressor, seen from a fixes scroll member, according to an embodiment of the invention;
FIG. 4
is a sectional view of the front housing, taken along line IV—IV of
FIG. 3
;
FIG. 5
is a vertical sectional view of a first conventional scroll type compressor;
FIG. 6
is a sectional view of a principal portion of the first conventional scroll type compressor, showing an assembly of the compressor;
FIG. 7
is a side view of a front housing of a second conventional scroll type compressor, seen from a front housing thereof;
FIG. 8
is a sectional view taken along line VIII—VIII of
FIG. 7
;
FIG. 9
is a side view of the second conventional scroll type compressor, seen from the fixed scroll member; and
FIG. 10
is a sectional view taken along line X—X of FIG.
9
.
DESCRIPTION OF THE PREFERRED EMBODIMENT
With reference to
FIGS. 1 and 2
, description will be made as regards a scroll type compressor according to an embodiment of the invention.
The scroll type compressor has a front housing
46
which has a plurality of flange portions
4
a
on the outer circumferential portion thereof. The flange portions
4
a
have a plurality of holes
4
d
for receiving therethrough bolts
3
which are shown in
FIG. 5. A
casing
2
has a plurality of flange portions
2
c
at the outer circumferential portion thereof and the flange portions
2
c
have a plurality of threaded holes
2
d
for engagement with the bolts
3
. In the illustrated embodiment, eight (8) flange portions
4
a
are formed on the outer circumferential portion of the front housing
46
and each of the flange portions
4
a
has a hole
4
d
so that eight holes in all are provided. The threaded holes
2
d
of the casing
2
have female threads for engagement with male threads of the bolts
3
, and the threaded holes
2
d
of the casing
2
are provided with tap drill holes
2
f
at an extended portion of the female threads thereof. The threaded holes
2
d
are referred to as threaded hole portions. On the other hand, the tap drill holes
2
f
are non-threaded and may therefore be referred to as non-threaded hole portions.
As illustrated in
FIG. 5
, the fixes scroll member
10
has an and plate
11
and an involute wrap
12
extending from an inner surface of the end plate
11
. An outer circumferential surface of the end plate
11
is closely contacted with an inner circumferential surface of the casing
2
through a sealing ring
35
to partition the interior of the housing
1
so that a discharge cavity
31
is confined on the outside of the end plate
11
and a suction chamber
32
is confined inside the end plate
11
. The casing
2
has a plurality of holes
33
at its bottom
2
a
and bolts
13
are inserted through the holes
33
so that the end portions of the bolts
13
are engaged with threaded holes
34
of the end plate
11
so that the fixed scroll member
10
is fixed to the casing
2
. At an extended portion of each of the threaded holes
34
is provided an extended hole portion, that is, a tap drill hole
11
f
as well illustrated in
FIGS. 3 and 4
.
The fixed scroll member
10
has a projection portion llg which extends from the and plate
11
toward the bottom
2
a
of the casing
2
. The bottom
2
a
of the casing
2
has a bottom projection portion
2
g
extending against, in an abutting relation with, an and of the projection portion
11
g
as illustrated in FIG.
4
. The threaded hole
34
and the tap drill hole
11
f
are extending from the projection portion
11
g
to the and plate
11
, and the hole
33
are provided at the bottom projection portion
2
g.
A method of assembly of the scroll type compressor according to the present invention will be described with reference to
FIGS. 1
to
4
. The movable scroll member
14
and the front housing
46
are assembled in a regular configuration with a relative angular degrees with each other by building in the front housing
46
, and the elements shown in
FIG. 5
such as the movable scroll member
14
, the orbital driving mechanism
7
,
8
,
21
,
23
,
24
,
25
, the rotation prevention mechanism
26
, the thrust pad member
36
, and others.
In the first step, with reference to the hole
33
of the bottom
2
a
of the casing
2
and the threaded hole
34
of the fixed scroll member
10
, a positioning jig
61
such as a positioning pin is inserted deep into the tap drill hole
11
f
as illustrated in
FIG. 4
so that the casing
2
is aligned with the fixed scroll member
10
.
Then, the bolts
13
are used to firmly fixing the casing
2
and the fixed scroll member
10
together. This will permit the assembly of the fixed scroll member and the casing
2
in a regular, relative angular relation with each other.
In case that the bolts
13
are used to fix casing
2
with the fixed scroll member
10
as described, the bolts
13
are inserted into, for threaded engagement with, the threaded holes
34
of the fixed scroll member
10
, after the positioning jig
61
is pulled back.
Then, with reference to the hole
4
d
of the front housing
46
and the threaded hole
2
d
of the casing
2
, the positioning jig
60
is inserted into the tap drill hole
2
f
so that the hole
4
d
is placed into an alignment relation with the threaded hole
2
d
, as shown in FIG.
2
. After that, the bolt
3
is used to firmly fix the flange portion
4
a
of the front housing
46
to the flange portion
2
a
of the casing
2
so that these elements are fixed together.
According to the scroll type compressor, the tap drill hole
2
f
of the threaded hole
2
d
in the fixed scroll member
10
and the hole of the casing
2
are used to proceed positioning of the casing
2
and the fixed scroll member
10
by the positioning jig as described and, therefore, the casing and the fixed scroll member do not require any special holes for the purpose of positioning.
Further, since the tap drill hole
2
f
of the casing
2
and the hole
4
d
of the front housing
46
are used, in combination with the use of the positioning jig
60
, to proceed positioning of the front housing
46
and the casing
2
, no special holes for positioning are required to the casing and the front housing.
Therefore, it is not necessary to provide flanges and holes for the sole purpose of positioning and, therefore, the process steps can be reduced with the result of reduction of cost for manufacturing and assembly of the scroll type compressor.
Further, the housing has no flange or hole for positioning purposes and, accordingly, a degree of freedom for appearance of the apparatus is improved.
Claims
- 1. A scroll type compressor comprising:a casing having an open end; a front housing closing said open end of the casing to define a hollow space in cooperation with said casing; a fixed scroll member and a movable scroll member placed in said hollow space, the both having involute wraps and end plates fixed to an axial ends of said involute wraps, respectively, said fixed scroll member being fixed to said casing, said involute wrap of the movable scroll member being inserted into said involute wrap of the fixed scroll member with an offset of a predetermined angular degree; and an orbital driving mechanism coupled to said movable scroll member for driving said movable scroll member to having an orbital motion without causing a rotating motion thereof; said front housing having a plurality of holes for inserting therethrough bolts; said casing having a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of said threaded hole portions, said threaded hole portions being for engagement with the bolts inserted into said holes of the front housing, said non-threaded hole portions being for receiving end portions of positioning jigs for an alignment of said front housing relative to said casing with a relative angular degree with each other so that at least one pair of said holes of the front housing and said non-threaded hole portions is used for positioning said front housing and said casing.
- 2. A scroll type compressor comprising:casing having an open end; a front housing closing said open end of the casing to define a hollow space in cooperation with said casing; a fixed scroll member and a movable scroll member placed in said hollow space, both having involute wraps and end plates fixed to axial ends of said involute wraps, respectively, said fixed scroll member being fixed to said casing, said involute wrap of the movable scroll member being inserted into said involute wrap of the fixed scroll member with an offset of a predetermined angular degree; and an orbital driving mechanism coupled to said movable scroll member for driving said movable scroll member to having an orbital motion without causing a rotating motion thereof; said casing having a plurality of holes for inserting therethrough bolts; said fixed scroll ember having a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of said threaded hole portions, said threaded hole portions being for engagement with the bolts inserted into the holes of the casing, said non-threaded hole portions being for receiving end portions of scroll positioning jigs for an alignment of the fixed scroll member relative to the casing with a relative angular degree with each other, so that at least one pair of said holes of said casing and said non-threaded hole portions of said fixed scroll member is used for positioning said fixed scroll member and said casing.
- 3. A method of manufacturing a scroll type compressor comprising:a casing having an open end; a front housing closing the open end of the casing to define a hollow space in cooperation with the casing; a fixed scroll member and a movable scroll member placed in said hollow space, both having involute wraps and end plates fixed to axial ends of said involute wraps, respectively, said fixed scroll member being fixed to said casing, said involute wrap of the movable scroll member being inserted into said involute wrap of the fixed scroll member with an offset of a predetermined angular degree; and an orbital driving mechanism coupled to said movable scroll member for driving said movable scroll member to have an orbital motion without causing a rotating motion thereof; said front housing having a plurality of holes for inserting therethrough bolts; said casing having a plurality of threaded hole portions and a plurality of non-threaded hole portions attended from extended ends of said threaded hole portions; said method comprises the steps of: inserting a positioning jig into at least one pair of said holes of the front housing and said non-threaded hole portions of said casing to make an alignment between said casing and said front housing; inserting the bolts into said boles of the front housing; and engaging tee bolts with said threaded hole portions of said casing thereby providing a firm coupling between said casing and said front housing.
- 4. A method of manufacturing a scroll type compressor comprising:a casing having an open end; a front housing closing said open end of the casing to define a hollow space in cooperation with said casing; a fixed scroll member and a movable scroll member placed in said hollow space, both having involute wraps and end plates fixed to axial ends of said involute wraps, respectively, wherein said involute wrap of the movable scroll member is inserted into said involute wrap of the fixed scroll member with an offset of a predetermined angular degree; and an orbital driving mechanism coupled to said movable scroll member for driving said movable scroll member to have an orbital motion without causing a rotating motion thereof; said casing having a plurality of boles for inserting therethrough bolts; said fixed scroll mm having a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of said threaded hole portions; said method comprises the steps of: inserting a scroll positioning jig into at least one pair of said holes of the casing and said non-threaded hole portions of said fixed scroll member to make an alignment between said casing and said fixed scroll member; removing the scroll positioning jig from said non-threaded hole portions of said fixed scroll member; inserting the bolts into said holes of the casing; and engaging the bolts with the threaded hole portions of the fixed scroll member thereby providing a firm coupling between the casing and the fixed scroll member.
- 5. The method of claim 4, wherein said front housing has a plurality of holes for inserting therethrough bolts; said casing having a plurality of threaded hole portions and a plurality of non-threaded hole portions extended from extended ends of said threaded hole portions; and the method further comprises the steps of:inserting a positioning jig into at least one pair of said holes of the front housing and said non-threaded hole portions of said casing, to make an alignment between said casing and said front housing; inserting the bolts through the holes of the front housing; and engaging the bolts with the threaded hole portions of the casing thereby providing a firm coupling between the casing and the front housing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
10-255436 |
Sep 1998 |
JP |
|
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4548556 |
Terauchi |
Oct 1985 |
|
4552517 |
Shimizu |
Nov 1985 |
|
4608001 |
Sugimoto et al. |
Aug 1986 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
4-112982 |
Apr 1982 |
JP |
12713652 |
Feb 1998 |
JP |