JP3086020B2 - Sealing device especially for valves with the shape of multi-way valves - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an axially moving valve piston which is held between two axially spaced annular walls for sealing between the valve housing and the valve housing. The invention relates to a sealing element for a valve having at least one annular sealing device with a single annular sealing element, in particular in the form of a multi-way valve.

[0002]

2. Description of the Related Art A sealing element of this type is disclosed in French Patent No. 2,314,411. This sealing member comprises a plurality of sealing devices having the same shape. The sealing device consists of two separate ring discs,
The sealing element is held radially continuously between the ring discs. This operation and installation is quite complicated, since each sealing element consists of a plurality of moving-fitted parts which are only locked together in the valve housing after assembly. Since the ring disc is only held along the narrow end of the valve housing in the assembled state, it is not stably held in the correct position. In addition, the function of the inserted sealing element is impaired if the two ring disks of each sealing device are accidentally pressed hard during assembly.

[0003]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a sealing device for a multi-way valve which achieves a combination of an inexpensive design and a reliable sealing action and can be easily assembled by a robot. It is.

It is a further object of the present invention to provide a sealing device which can be mounted on a sealing element without damage and at the same time can be easily mounted on a valve.

[0005]

SUMMARY OF THE INVENTION In order to overcome the above problems and to achieve the object, the present invention provides a housing ring having two axially spaced walls and an annular ring held by the two walls. A sealing device comprising at least one sealing unit for sealing between a valve piston and a valve housing, which comprises a sealing element and moves in an axial direction. The housing ring has a radially oriented housing opening and has a U-shaped cross-section, and in the annular ring space between the two walls, a monolithic annular sealing element is fixed in a radially adjustable manner. Having a radially extending annular sealing lip, wherein the sealing portion of the annular sealing lip extends through the housing opening from the annular ring space and radially projects from the housing ring, and the portion of the sealing lip within the ring space is Axially laterally adjoining the two wall support parts, the sealing element comprises at least one annular retaining projection projecting in the axial direction, the retaining projection being provided on the housing shoulder of the housing ring in the ring space. The latch permanently holds the sealing element. The sealing device includes the housing ring
The valve housing recess or a valve that moves relative to the recess
Fixed to the piston by pressure fit .

With the sealing device according to the invention, it is possible to produce the sealing device as a sealing ring-shaped part which can be operated uniformly or integrally with the part to be sealed separately. The sealing element consists of several parts, which can be permanently connected after easy insertion into the ring space of the housing ring. Only a single sealing element guarantees a reliable function of the sealing ring.
The support portions of the housing ring are provided on both sides of the sealing lip, but rather flexible sealing materials can be used. The sealing lip is protected from lateral bending and kinking by the support. The sealing element rests on the housing step of the annular space so that the sealing element does not fall off under heavy loads. Such a structure is particularly suitable for assembly by a robot, so that the sealing ring and the valve having this sealing ring can be automatically mounted. The sealing ring can be used freely. The inner or outer sealing ring can be obtained, for example, by choosing the radial arrangement of the housing openings. The material of the one-piece sealing element is preferably pervnan or a resilient synthetic resin such as polyurethane. The housing ring is made of metal, but may be entirely or partially made of a synthetic resin material. In this case, a strong polymer is preferred.

US Patent No. 3,275,334 discloses a cartridge-like sealing device. However, this sealing device consists of a plurality of sealing elements which are pressed by a spiral spring against a surface requiring a sealing action. This is also a sealing device for rotating parts. As the housing of the sealing device is stationary and the sealing element rotates with respect to the housing, the sealing element slides along the housing while rotating.

[0008] Swiss Patent No. 600,202 also discloses a sealing device comprising a plurality of sealing elements.
This sealing element must be individually assembled in a radial groove in one of the parts requiring sealing action. U.S. Pat. No. 3,565,115 discloses a valve in which a sealing element is combined with a retainer structure.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A multi-way valve 1 shown in FIG.
The valve housing 2 has a shape of a way valve and has a long valve housing recess 3 inside. The valve housing recess 3 has a function of receiving the valve spool or the valve piston 9 and is constituted by a component such as a sleeve which is directly incorporated in the valve housing 2 or fixed to the valve housing 2. At least one end of the valve housing 2
Since the valve cover (not shown) is detachably provided, the valve housing recess 3 can be touched from at least one shaft end.

A plurality of valve ducts 4, 5, 6, 7, 8 are opened laterally around the circumference of the valve housing recess 3. Outside the valve housing recess 3, the valve duct 6 is connected to a source of compressed air, the valve ducts 7 and 8 are connected to a load, and two other valve ducts 4 and 5 are provided for exhausting the used air, as is well known. Have been.

The valve piston 9 can reciprocate in the axial direction 44 in the recess 3 of the valve housing. Valve piston 9
Is composed of a plurality of recesses 10 extending circumferentially alternately in the axial direction and lands 11 which are protrusions.
The circular cross section of is variable along its length. Some valve ducts are connected to each other depending on their longitudinal position, while others are separated from each other.

A sealing device 45 is provided for sealing between the wall 12 of the valve housing recess 3 and the valve piston 9. The sealing device 45 includes a plurality of sealing rings 13 that are coaxially and relatively provided at an interval from each other. Each of the sealing rings 13 is provided with a housing ring 14 which is a housing. The sealing ring 13 is axially fixed in the valve housing recess 3 by a housing ring 14. Sealing ring 13
Is arranged coaxially between the wall 12 and the valve piston 9 and surrounds the valve piston 9 by an annular sealing element 20 on the land 11 without impeding the axial movement of the valve piston 9.

The sealing ring 13 constitutes an annular sealing device, which reliably separates the individual sections of the valve housing recess 3 in the valve housing recess 3 in the axial direction, so that the valve ducts 4 to 8 are separated into these individual sections. It is open. Accordingly, the sealing rings 13 are each located at the shaft portion between two axially continuous ports 46 which are openings of the valve duct. One row of ports 4
The last port of 6 can be provided with a sealing ring 13 as sealing means for preventing the fluid power medium from being lost to the outside. Thus, it is clear that the number of sealing rings 13 per valve depends on the type of valve and the number of valve ducts.

FIG. 1 only shows a schematic view of the sealing ring 13 of the sealing device, a detailed embodiment of which is shown in FIGS. Each of the sealing rings 13, 13 'and 13 "shown in Figures 2 and 3 is provided with a housing ring 14, which is an annular sealing housing. The housing ring 14 is a multi-part design, The individual parts are fixedly or permanently connected such that the cross-section of the housing ring 14 is U-shaped, so that the housing ring 14 has a circumferentially extending ring space 15 . The three sides of the space 15 are defined by two ring parts 16 and 16 'corresponding to the U-shaped legs and a ring part 17 corresponding to the U-shaped cross-section, and on the other side the circumference A housing opening 18 is provided which is oriented radially at.

Each ring space 15 of the sealing ring 13 is provided with one annular sealing element 20 of integral construction. The annular sealing element 20 is concentrically fixed for radial adjustment. Housing ring 14 and sealing element 20
The annular sealing element 20 is permanently retained on the housing ring 14 such that the resulting sealing ring is a part that can be handled uniformly as a single part.

A sealing ring 13 can be locked by a housing ring 14 to one of two relatively movable parts that can be sealed to one another. FIG.
In the case of the valve 1 shown in FIG. 1, the ring part 17 of the housing ring 14 is locked on the wall 12 with the radially outward direction and the housing opening 18 is closed on the radially inner valve piston 9.
To fix the sealing ring 13 in the correct position of the valve housing 2. The sealing ring 13 can be provided in various ways in the valve housing recess 3.
Is axially fixed within. In this embodiment, the axial fixation is performed by a press-fit.

The sealing element of this embodiment 20 comprises two retaining projections 49 and 49 'are formed integrally with the sealing lip 48 and sealing lip 48.
The cross section of the sealing lip 48 has the shape of a radially extending circular washer. Sealing lip 48
Part 50 consisting of a radially inner circumferential end of the
Extends from the ring space 15 through the housing opening 18 so as to project radially inward from the two ring portions 16 and 16 ′ of the housing ring 14. The portion of the sealing lip 48 located in the ring space 15 is laterally adjacent to the ring portions 16 and 16 'serving as two axial supports, so that the sealing lip 4
When the valve piston 9 enclosed by 8 moves, the sealing lip 48 can be prevented from bending or kinking laterally.

The two retaining projections 49 and 49 'are integrally formed with the circumferential end of the sealing lip 48 in the ring space 15 and are respectively directed from the circumferential end to the opposite axial direction. That is, the holding projections 49 and 49 'are opposite to each other in the axial direction. Therefore sealing element 2
0 has a T-shaped cross section. The retaining projections 49 and 49 'are circumferential ring claws, and the housing steps 51 and 51' which are a part of the housing ring 14 in the ring space 15.
Around or hooked around. Thus, the sealing element 20 is fixed or anchored to the housing ring 14.

The two housing steps 51 and 51 ′ comprise a transition region between an axially wide portion 52 of the ring space 15 and a narrower slot 53. One end of the slot 53 is connected to the housing opening 18 in the radial direction, and the other end is connected to the wide portion 52 in the radial direction. The ring space 15 thus has a T-shaped cross section and is therefore suitable for receiving a sealing element 20 having a T-shaped cross section.

Although not shown, an embodiment in which only one claw or protrusion is provided is possible, but the two holding projections provided in this embodiment can securely mount the sealing element. The axially measured width of the annular space 15 forming the two supports 54 and 54 'adjacent to the slot 53 is the width of the sealing lip 48 so that the sealing lip 48 can move slightly in the axial direction. Preferably, it is slightly larger. This is advantageous for the sealing function. Further, the sealing lip 48 adjacent to the sealing portion 50 has a circumferentially extending thick portion 55.
Having. This portion 55 extends slightly to the upper slot portion 53. The sealing element 20 is effectively deformed because a thin sealing lip having a neck-shaped cross section is provided between the thick portion 55 and the holding projections 49, 49 'provided on both axial sides. I do.

The sealing element 20 is preferably made of a synthetic resin having rubber elasticity. The sealing element 20 is rubber,
It is preferably made of Perbunan or polyurethane. When the bottom 47 provided on the side opposite to the housing opening 18 of the ring space 15 in the radial direction has a region 56 having a cross section deeper than the region adjacent in the axial direction, the sealing portion 50 Since the shape of the formed cross section can be adjusted elastically, the cross section of the valve piston 9 where the sealing action is performed during manufacturing can have a tolerance. This area 56 is adjacent to the axial center of the bottom 47 as shown in FIG. In this case, the bottom 4
Since the groove 7 is groove-shaped, the axial center of the bottom 47 is separated from the longitudinal axis 57 of the sealing ring 13 more than the axial end region of the bottom 47.

On the other hand, the circumferential surface of the sealing element 20 adjacent to the bottom 47 is usually cylindrical. Thus, on the axial extension of the sealing lip 48, a radially increasing center space 58 is provided between the sealing element 20 and the bottom 47. The retaining projections 49 and 49 ′ form the outer peripheral surface of the sealing element 20, in which case the outer ends of the retaining projections 49 and 49 ′ are positioned adjacent to the axial end of the bottom 47 of the ring space 15. I do. Here, when a radial pressing force is applied to the sealing lip 48 when introducing one of the lands 11 of the valve piston 9, the radial center of the sealing element 20 can be deformed axially outward into a circumferential space 58. . Retaining lugs 49 and 49 'serve to radially move the mounting lip 48.

The retaining projections 49 and 49 'are in axial contact with their facing portions of the wide portion 52. The sealing element 20 can also be clamped between two axially spaced parts of the housing ring 14 in the part adjacent to the retaining projections 49 and 49 '.

When the sealing ring 13 is mounted in the valve housing recess 3, the sealing element 20 can seal the concentrically surrounding lands 11 at the sealing section 50. This is because a pressing force is applied to the circumferential surface of the land 11, and engagement for sealing is performed. When the housing ring 14 is fixed by concentrically press-fitting the housing ring 14 into the valve housing recess 3, the space between the housing ring 14 and the valve housing 2 is automatically sealed. A further seal is provided between the sealing element 20 and the housing ring 14. In particular, the holding projections 49 and 49 'and / or the thick portion 5
The sealing is effected by the engagement of the part 5 with the part of the housing ring 14.

The housing ring 14 of the sealing ring 13 has a plurality of parts. In this embodiment, the housing ring 14 is shown in FIG.
29, three ring portions 30, 31, in FIG.
Consists of 32. Ring portions 28, 29, 30, 31, 3
By connecting the two together, a rigid housing ring 14 is formed. In a state where these ring parts are not connected, that is, the housing ring 14 of the sealing rings 13 and 13 'has not been assembled yet, or the sealing rings 13 and 13 ".
When the ring portion of the housing ring 14 is not mounted, there is an axially oriented annular member receiving opening which opens into the ring space 15 so that the sealing element 20 is open. The sealing element 20 can be inserted axially into the ring space 15 without deforming the sealing element 20. It is therefore possible to first manufacture the ring part of the sealing ring 13 separately, insert the sealing element 20 before assembling the ring part of the sealing ring 13, and then close the insertion opening and simultaneously attach the remaining ring part Is preferred.

As shown in FIG.
3, 13 "comprises three ring sections 30, 31 and 32. The ring section 30 is designed as a hollow cylindrical ring section forming the circumferential wall of the ring section 17. The remaining two ring sections 31 and 32 32 forms two walls, ring portions 16 and 16'.Ring portion 1
6 and 16 'are laterally adjacent to the sealing element 20 in the axial direction. The ring portions 16 and 16 'are centrally perforated washers and are hollow cylindrical ring portions 3.
0, which are arranged at the two axial ends and whose radially outer circumferential ends are fixed radially inward of the ring part 30. Thus, the axial length of the housing ring 14 depends on the axial length of the ring portion 30. The inner surface of the ring part 30 forms the bottom 47 of the ring space 15. On the other hand, the axial surface of the ring space 15 including the housing steps 51 and 51 'is formed on the left and right ring portions 31 and 32. As shown in FIG. 3, the measured depth of the wide portion 52 in the radial direction may be greater than the measured thickness of the retaining projections 49 and 49 '.

Two adjacent ring portions 30 and 3
1 and a detent connection in order to permanently connect these ring parts to one another at the contact areas 30 and 32.
t connection) 59 is used. The detent connection 59 is composed of a detent protrusion and a detent recess that mesh with each other to enable a permanent connection. In the embodiment shown in FIG. 3, the bottom 47 has a convex cross-section towards the radially inner center. This convex surface forms the axially adjacent surface of the disk-shaped ring portions 31 and 32 which are simultaneously snapped from the outside.

At least one of the ring portions joined together to form the detent connection 59 is made of a synthetic resin material. In the embodiment shown in FIG. 3, the two left and right ring portions 31 and 32 are made of a synthetic resin material, particularly a polymer having high strength, and the hollow cylindrical ring portion 30 is made of a metal.

Instead of the detent connection 59, an easily assembled pressure-fit assembly system can be used. Such a system is shown in FIG.
3, 13 '. In this embodiment, ring portions 28 and 29 are made of metal. For the sealing rings 13, 13 'as shown in FIG.
It has a letter-shaped cross section. In the sealing rings 13, 13 ', the axially extending ring part 16' and at least a part of the circumferential ring part 17 are combined as a single piece. The other ring portion 16 is formed by a washer-like ring portion 29 adjacent the free end of the ring portion 17 and facing the ring portion 16 '. As shown in FIG. 2, the washer-shaped ring portion 29 is radially outwardly surrounded by a circumferential ring portion 17 in which it is press-fitted.

The depth of the press fit in the ring part 29 is limited by the circumferential ring step 60 of the ring part 17. This circumferential ring step 60 is adjacent to the axial center of the assembled housing ring 14. Thus, the bottom 47 of the ring space 15 is formed by the axially adjacent portions of the two ring portions 28 and 29. Since this portion is composed of conical portions having larger diameters facing each other, the groove-shaped bottom portion 47 is automatically formed in an assembled state.

The housing ring 14 of the sealing rings 13 and 13 'can also be provided as a structure having a U-shaped cross section. That is, in this case, the housing ring 14 first extends radially outward from the ring space 15 adjacent to the U-shaped cross-section connecting the U-shaped legs, and then axially of the housing ring 14. And a branch surface extending to the outer surface in the direction.

It is more effective if the two ends of the two ring portions 16 and 16 'which are laterally adjacent to the housing opening 18 are tapered towards the housing opening 18. The cross-section enclosed by the housing ring 14 extends from the portion adjacent the housing opening 18 toward the axially outer surface. This expanding portion may be formed by a conical oblique surface.

As a method of connecting the two ring portions, joining, soldering or welding is possible, but detent connection or pressure fitting is simpler and is more suitable for a robot assembly line. The sealing ring 13 may be designed so that both the housing opening 18 and the sealing part 50 face radially outward. In this case, the sealing ring 13 is fixed by means of a radially inwardly directed ring part 17 and the sealing part 50 seals on the outside. In such an arrangement, the sealing ring 13 can be used as a piston seal fixed to the piston and the piston of the cylinder device.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view of a valve provided with a plurality of sealing rings. The drive required to operate the valve piston is not shown and is
The ring is shown simply.

2 is a cross-sectional view along an axially and radially extending plane of a variant of a sealing ring to show how it can be incorporated in various ways into the valve shown in FIG. 1; .

FIG. 3 is a sectional view of a modified example of the sealing ring similar to FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Multi-way valve 2 Valve housing 12 Wall 13 Sealing ring 14 Housing ring 15 Ring space 18 Housing opening 20 Sealing element

────────────────────────────────────────────────── ─── Continuation of the front page (73) Patent holder 591034361 Ruiter Strass 82, 73734 Esslingen, Germany (56) References Japanese Utility Model Application Sho 61-29168 (JP, U) US Patent 3275334 (US, A) French Patent 2314411 (FR, B) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16J 15/16-15/30 F16K 11/07

Claims (18)

(57) [Claims] 1. A valve assembly comprising a housing ring having two axially spaced walls and an annular sealing element retained on said two walls, said valve ring being movable between an axially moving valve piston and a valve housing. A sealing device comprising at least one sealing unit for sealing the housing, wherein the housing ring has a radially oriented housing opening and has a U-shaped cross-section, wherein an annular ring between the two walls In the space, the annular sealing element of unitary construction is fixed in a radially adjustable manner and has a radially extending annular sealing lip, the sealing part of which is a housing opening from the annular ring space. Through the housing ring and project radially from the housing ring, The portion in the space is axially laterally adjacent to the support portion of the two walls, and the sealing element comprises at least one annular retaining projection projecting in the axial direction, the retaining projection being in the ring space. the sealing element is permanently retained by latching the housing stepped portion of the housing ring, the housing ring, said valve housing recess
Or pressure fit to a valve piston that can move relative to it
A sealing device characterized by being more fixed . 2. The annular sealing element comprises two retaining projections provided on opposite axial sides, said retaining projections extending axially in opposite directions from said sealing lip, said annular housing steps being provided in said ring space. The sealing device according to claim 1, wherein the sealing device is hung on a portion. 3. The housing step comprises a transition region between an axially wide portion of the annular ring space and a narrower slot portion, the slot portion extending between the wider portion and the housing opening. The sealing device according to claim 1, wherein the sealing device extends in a radial direction. 4. The sealing element of the housing ring and the ring space have a T-shaped cross section, and the T-shaped three parts of the annular sealing element each comprise the retaining projection and the sealing lip. 4. The sealing device according to claim 3, wherein the radial length of the sealing lip is longer than the axial length of the two holding projections. 5. A bottom portion of the ring space, the bottom of which is opposite to the housing opening in the radial direction, has a cross section deeper than a portion adjacent in the axial direction, and the deep portion is located at the axial center of the bottom. The sealing device according to claim 1, wherein the sealing device is used. 6. A circumferential thick portion axially adjacent to the sealing lip extends slightly into the ring space, and a gap between the thick portion and the holding projection is provided by the sealing lip. 2. The sealing device according to claim 1, wherein a thin neck portion is formed. 7. The axial width of the ring space of the portion adjacent to the two walls widely than the width of said portion of said sealing lip, there is play in the sealing lip of the support portion 2. The sealing device according to claim 1, wherein the sealing device is movable laterally between the two. 8. The sealing device according to claim 1, wherein the sealing lip is formed in a washer shape. 9. The annular sealing element at the axial end of the retaining projection contacts the housing ring in the ring space and between two axially spaced portions of the housing ring. 2. The sealing device according to claim 1, wherein the holding claws of the sealing element are clamped. 10. The housing ring has a permanent connection to a ring portion into at least two concentric shafts form, for inserting the sealing element into the ring space in a state before assembling the two ring parts The annular opening is provided in the axial direction.
The sealing device as described. 11. The housing ring in which at least one of said ring portions is washer-shaped and wherein said ring portion has at least one axial wall corresponding to one of the U-shaped legs of said housing ring. 11. The sealing device according to claim 10, wherein the sealing device forms a part. 12. At least one of said ring portions of said housing ring has two ring portions forming an L-shaped cross-section, one of said ring portions being U-shaped when said housing ring is assembled. Forming an axial wall corresponding to one of the U-shaped legs and another ring portion forming at least a portion of a circumferential wall corresponding to a connection portion of the U-shaped leg of the housing ring. The sealing device according to claim 10, characterized in that: 13. At least one of said ring portions has the shape of a washer when the housing ring is assembled and has at least a portion of an axial wall corresponding to one of the U-shaped legs of said housing ring. If the housing ring comprises two ring portions, it has the shape of a ring disk and is provided radially inward adjacent to the free end of the ring portion forming the circumferential wall of the L-shaped ring portion. 13. The sealing device according to claim 12, wherein: 14. The housing ring comprises three ring portions, a hollow cylindrical ring portion forming a circumferential wall of the housing ring, and two axial ends of the cylindrical ring portion having a washer shape. 12. The sealing device according to claim 11, wherein the ring portion having the shape is provided radially inward. 15. The upper cut ring portion sealing apparatus according to claim 10, characterized in that is connected by being pressed together. 16. upper cut ring portion sealing device according to claim 1, characterized in that connected to each other by a retaining connection or elastic locking connection detent. 17. The sealing device according to claim 1, wherein said housing ring has a cross-section adjacent to said two axial walls and tapering radially toward said housing opening. . 18. The housing ring and the annular shell.
A plurality of sealing rings comprising a plurality of sealing elements are provided in the valve housing recess at an axially continuous distance from each other, and are fixed in the axial direction by being locked to the valve housing by the housing rings; A sealing means projecting from the housing ring by engaging housing means having a sealing lip extending through the housing ring facing inwardly through the sealing ring projecting from each of the housing openings. 2. The sealing device according to claim 1, wherein the sealing device is concentrically surrounded in a sealing state.