Information
-
Patent Grant
-
6810565
-
Patent Number
6,810,565
-
Date Filed
Monday, January 12, 200420 years ago
-
Date Issued
Tuesday, November 2, 200419 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Antonelli, Terry, Stout & Kraus, LLP
-
CPC
-
US Classifications
Field of Search
US
- 028 104
- 028 167
- 028 105
- 239 5533
- 239 5535
- 239 5903
- 239 5905
- 239 600
- 239 566
- 239 597
- 239 568
- 068 205 R
-
International Classifications
-
Abstract
During the construction of the nozzle beam according to DE-A-195 01 738, the insertion slit for the nozzle strip (14) is sealed on the front side of the nozzle beam by means of a screwed cover (16,17). It is easier to exchange a nozzle strip (14) if a special closing unit (26) having an opening (3) for the nozzle strip is provided on the front side, and said opening (30) is closed in a liquid-tight manner by a simply fixed insertion mandrel (31).
Description
The invention relates to a jet manifold on a device for generating extremely fine fluid jets used in the hydrodynamic jet impingement of fibers of a web moving along the manifold, such as a fiber web, tissue, etc., or a woven or knit, which manifold is composed of an upper section extending over the working length of the web, and of a lower section, wherein
a. a pressure chamber of round cross-section is located along the length of the upper section, the fluid being supplied under pressure, for example, to the front side of the chamber;
b. a pressure distribution chamber is provided in the lower section in parallel to the above;
c. the pressure distribution chamber discharges into a narrow fluid outlet slit opposite the cross-section of the pressure distribution chamber;
d. a jet strip is mounted in a fluid-tight fashion within the jet manifold above the fluid outlet slit; and
e. this jet strip may be replaced through a closable opening on the front side of the jet manifold.
A device of this type is disclosed in German Patent 195 01 738, the content plus drawings of which are referenced here as prior art. Within the pressure chamber, water pressures of up to 1,000 bar are generated which, of course, act on the end walls of the jet manifold. In order to produce the orifices in the manifold, the one front side must initially be open, then closed by covers. Special covers are provided for the pressure chamber as well as the pressure distribution chamber, the covers being attached by screws to the jet manifold wall. A special cover is also provided to close the jet strip replacement opening, this cover also being attached to the jet manifold wall by screws. O-rings recessed in the sealing walls serve to provide a fluid-tight seal.
When replacement of the jet strip is required, the two screws located in it which attach the cover to the manifold are loosened with a screwdriver—after having shut off the water supply—and the cover and screws set aside for reuse. Although only two screws need to be loosened, a screwdriver is still required for this operation, a procedure which may be viewed as disadvantageous.
The goal of the invention is to find a solution for a jet manifold of the type referred to at the outset which allows for the rapid replacement of the jet strip without equipment disassembly and without a screwdriver.
The goal is achieved by
f) providing a closing unit on the closable opening which
g) is provided at the level of the jet strip mounting position with an insertion slot for the jet strip, which slot
h) is closable by an insertion mandrel.
The insertion mandrel may be retained by a bolt secured within the closing unit, which bolt may be easily removed from a hole retaining the insertion mandrel in the jet manifold after shutting off the water supply and thus the water pressure. Loss of the bolt may be prevented by securing it to the jet manifold using, for example, a thread-like link; the insertion mandrel may be removed by hand from the closing unit, preferably along with the jet strip, and the same items may then be inserted along with the insertion mandrel after replacement with a new strip.
An example of a jet manifold of the type enhanced according to the invention is shown in the drawings:
FIG. 1
shows a section through a conventional jet manifold;
FIG. 2
is a view of the front side of the jet manifold in
FIG. 1
;
FIG. 3
shows a section along line C—C in
FIG. 1
providing a view of the lower section of the jet manifold;
FIG. 4
is a section along line IV—IV in
FIG. 5
, specifically, one of the two front sides of the jet manifold in
FIG. 1
now enhanced by a new rapid replacement device for the jet strip;
FIG. 5
is a top view of the device in the region of the front side of the jet manifold;
FIG. 6
is a section through the closing unit, similar to that of
FIG. 4
with another retainer for the jet strip;
FIG. 7
is a section of the same type as in
FIG. 6
with the insertion mandrel removed;
FIG. 8
is a top view of the device according to
FIG. 6
, and
FIG. 9
is a schematic diagram showing the procedure for rapidly attaching the jet strip in the rapid replacement device of FIG.
6
.
The jet manifold seen in
FIGS. 1-3
is disclosed in German Patent 195 01 738, but may be replaced by another item working on a similar principle. The housing of the jet manifold is composed of an upper section
1
which is attached to the lower section
2
at multiple sites over its length from below by screws, not shown. Upper section
1
has two longitudinal cavities
4
and
5
, of which the upper one is the pressure chamber
4
and the lower one is the pressure distribution chamber
5
. Both chambers are open at the one front side but are closed by screw-attached covers
6
and
7
forming a liquid-tight seal. At the other end, pressure chamber
4
has an opening
4
′ through which liquid is introduced under pressure. The two chambers
4
and
5
are separated by a partition
8
. A large number of passages
9
in partition
8
over the length of the jet manifold connect the two chambers, thus allowing the fluid entering pressure chamber
4
to discharge into pressure distribution chamber
5
in a uniformly distributed manner over its length. The pressure distribution chamber is open at the bottom as a result of a slot
10
, which slot is narrow relative to the diameter of the cavity of pressure distribution chamber
5
and also extends the length of the manifold.
Upper section
1
is permanently screwed onto lower section
2
forming a fluid-tight seal. The seal is created by the O-ring
11
which is inserted in an annular groove
11
′ of upper section
1
. At the center between O-ring
11
, slot
10
surrounds a spring projection
23
which is fitted into an appropriate groove
25
of lower section
2
. Another annular groove
12
′ is incorporated in the base of base of groove
25
of lower section
2
, in which groove
12
′ O-ring
12
is inserted to seal jet strip
14
. In line and below fluid passages
9
and slot
10
, another slot
13
is incorporated in lower section
2
, which slot is extremely narrow at the top, providing an opening which is only slightly wider than the width of the effective jet orifices of jet strip
14
.
In alignment with covers
6
,
7
, or with the back housing end wall
15
, lower section
2
is screwed on forming a fluid-tight seal by additional covers
16
and
17
. One groove
18
,
19
each is incorporated in covers
16
,
17
at the level of lower jet strip
14
retained in the lower section, into which grooves jet strip
14
projects, thereby allowing it to be easily grasped for removal and replacement after disassembly of covers
16
or
17
.
In place of the screw-on covers
16
,
17
of
FIGS. 1
,
2
, the screws of which are unscrewed and set aside together with covers
16
,
17
during replacement, a projecting closing unit
26
is provided according to
FIGS. 4
,
5
opposite the front side of upper section
1
of the jet manifold, which unit allows for rapid replacement of jet strip
14
. The unit is composed of a block matching the width of the jet manifold, one side of which is permanently screwed onto lower section
2
of the jet manifold by screws
27
,
28
, and which block includes at the center of this side a continuous slot
29
to allow insertion of jet strip
14
. On the other side at the same level is an insertion slot which is open to the outside and allows insertion of jet strip
14
and may be closed by insertion mandrel
31
. In order to secure insertion mandrel
31
in the insertion slot which is expanded relative to insertion opening
30
, closing unit
26
of
FIG. 4
has a hole
32
running continuously from top to bottom which is matched by an aligned hole
33
in insertion mandrel
31
when in the inserted state in insertion opening
30
. Insertion mandrel
31
is secured to closing unit
26
, and thus to the jet manifold, by these holes
32
,
33
passing through parts
26
and
31
, and by the bolt
34
inserted therein. Bolt
34
is easily manipulated in its holes
32
,
33
by closing unit
26
which projects opposite the front side of the jet manifold.
Insertion mandrel
31
is sealed by an O-ring
35
in insertion opening
30
, while block
26
along with its end
26
′ extending into jet manifold
1
,
2
is sealed by a ring gasket
36
at the front side of end
26
′ within upper section
1
and lower section
2
.
In
FIG. 4
, jet strip
14
is secured in a slot
37
at the end of insertion mandrel
31
, for example, by a pin
38
or a friction spring, and may easily be moved back and forth by a grip
39
at the other end of insertion mandrel
31
. To replace the jet strip, it is only necessary to remove the water pressure in the jet manifold and withdraw bolt
34
. Jet strip
14
may then be easily removed by grip
39
, and the new strip inserted after replacement of jet strip
14
is completed. To secure insertion mandrel
31
, it is then only necessary to once again insert bolt
34
through holes
32
,
33
. The water pressure may then be increased.
In the device of
FIGS. 6-9
employing the same principle, the rapid replacement device for jet strip
14
has been modified. This device is composed of two spring strips
40
,
41
pressed against each other which are attached one above the other to the front side of insertion mandrel
31
and parallel to jet strip
14
. Spring strips
40
,
41
are bent upward at their free ends as shown in
FIG. 9
a
. A short pin or a hemisphere
42
is attached in the region of this bend to lower spring strip
40
, which pin or hemisphere penetrates a matching hole
43
in the upper spring strip
41
when spring strips
40
,
41
are in contact with each other. One end of jet strip
14
has a corresponding hole
44
through which sphere
42
of spring strip
40
passes in order to retain strip
14
on insertion mandrel
31
. As
FIG. 9
e
shows, this arrangement allows jet strip
14
to be quickly replaced. The two spring strips
40
,
41
are intended to be bent upwards only with the end of jet strip
14
, and the replacement procedure for the arrangement is intended to be performed according to
FIGS. 9
g
and
h.
In the example of
FIGS. 6-8
, bolt
34
′ extends horizontally rather than vertically. Bolt
34
′ thus covers the insertion holes for screws
27
,
28
; however, these are deeply countersunk and rarely need to be replaced. In addition, the free end of bolt
34
′ projects from closing unit
26
, there passing through ring
45
which functions as a contact sensor for the properly locked closing unit
26
. In this regard, the ring
45
laterally attached to closing unit
26
is connected electrically through wires
46
to the control unit of the jet manifold in which the water pressure is increased only when closing unit
26
is properly blocked by bolt
34
′.
Claims
- 1. Jet manifold on a device for generating extremely fine fluid jets used in the hydrodynamic jet impingement of fibers of a web moving along the manifold, which manifold is composed of an upper section extending over the working length of the web, and of a lower section, whereina) a pressure chamber of round cross-section is located along the length of the upper section, the fluid being supplied under pressure, the chamber; b) a pressure distribution chamber is provided in the lower section in parallel to the pressure chamber; c) the pressure distribution chamber discharges into a narrow fluid outlet slit opposite the cross-section of the pressure distribution chamber; d) a jet strip is mounted in a fluid-tight fashion within the jet manifold above the fluid outlet slit; e) the jet strip may be replaced through a closable insertion opening on a front side of the jet manifold, characterized in thatf) a closing unit is provided on the closable insertion opening which g) is provided at the level of the jet strip mounting position with an insertion slot for the jet strip, which slot h) is closable by an insertion mandrel.
- 2. Jet manifold according to claim 1, characterized in that the closing unit (26) projects opposite the front side of the jet manifold (1, 2).
- 3. Jet manifold according to claim 1, characterized in that the insertion mandrel (31) is retained on the jet manifold (1, 2) by a bolt (34, 34′) secured within the closing unit (26).
- 4. Jet manifold according to claim 3 characterized in that the bolt (34′) inserted into the closing unit (26) contacts an operating switch (45, 46) which enables start-up of the jet manifold after contact has been made.
- 5. Jet manifold according to claim 4, characterized in that the operating switch (45, 46) is attached to the closing unit (26) on the exit side of the bolt (34′).
- 6. Jet manifold according to claim 4, characterized in that the operating switch (45, 46) is composed of an electrically activatable ring (45) which triggers the “on” contact when the bolt (34′) is inserted.
- 7. Jet manifold according to claim 1, characterized in that the insertion slot (29) in the closing unit (26) is enlarged relative to the dimensions of the jet strip (14) and that the insertion mandrel (31) fills the insertion opening (30).
- 8. Jet manifold according to claim 3, characterized in that the closing unit (26) has a passage (32) oriented vertically to the axis of the insertion opening (30), through which passage the bolt (34, 34′) is movable, and that the insertion mandrel (31) has an alignment hole (33) matched to the diameter of the bolt (34, 34′).
- 9. Jet manifold according to claim 1, characterized in that the front side of the insertion mandrel (31) is provided with a retainer for the jet strip (14).
- 10. Jet manifold according to claim 9, characterized in that the jet strip (14) is attached in an easily replaceable manner to the retainer.
- 11. Jet manifold according to claim 9, characterized in that the insertion mandrel (31) has a blind slot (37) on its front side which is matched to the jet strip (14).
- 12. Jet manifold according to claim 11, characterized in that the jet strip (14) is retained in an easily replaceable manner within the blind slot (37).
- 13. Jet manifold according to claim 9, characterized in that the retainer is composed of two spring strips (40, 41) which are pressed together, are attached to the insertion mandrel (31) and freely project from said mandrel, between which spring strips the jet strip (14) is retained.
- 14. Jet manifold according to claim 13, characterized in that a spherical projection (42) is attached to one of the spring strips (40), which projection extends into a hole (43) of the opposing spring strip (41).
- 15. Jet manifold according to claim 9, characterized in that the jet strip (14) has a hole (44) at one end which engages the retainer of the closing unit (26).
- 16. Jet manifold according to claim 1, characterized in that an O-ring (35) is provided around the circumference of the insertion mandrel (31).
- 17. Jet manifold according to claim 9, characterized in that a grip (39) is provided on the end of the insertion mandrel (31) opposite the retainer of the jet strip (14).
- 18. Jet manifold according to claim 1, characterized in that the closing unit (26) projecting opposite the front side of the jet manifold (1, 2) is composed of a block, the lateral ends of which on both sides of the insertion opening are attached by being screwed together (27, 28) to the front side of the jet manifold (1, 2), in the center section of which the insertion slot (29) is provided for the jet strip (14), and this strip is retained there.
- 19. Jet manifold according to claim 18, characterized in that a free end (26′) of the closing unit (26) extending into the jet manifold (1, 2) along a corresponding groove within the jet manifold is sealed (36) relative to the jet manifold (1, 2).
Priority Claims (2)
Number |
Date |
Country |
Kind |
101 07 403 |
Feb 2001 |
DE |
|
101 12 446 |
Mar 2001 |
DE |
|
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
PCT/EP02/01275 |
|
WO |
00 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO02/06487 |
8/22/2002 |
WO |
A |
US Referenced Citations (9)
Foreign Referenced Citations (1)
Number |
Date |
Country |
19501738 |
Jul 1996 |
DE |