JP2015096747A - Seal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the attachment workability in a seal device 1 having structure in which a resin ring 20 is pushed out from a housing 10 in an axial direction to be slidably placed in close contact with a mating surface.SOLUTION: A seal device includes: a housing 10; a resin ring 20 which is disposed on an inner periphery of the housing 10 so as to move in an axial direction; an elastic body 30 which is disposed on the inner periphery of the housing 10 and biases the resin ring 20 in the axial direction to push out the resin ring 20 to the exterior of the housing 10; and support means 40 provided at the resin ring 20. The support means 40 may be inserted into the inner periphery of the housing 10 and supports the resin ring 20 with its insertion state into the inner periphery of the housing 10 maintained in a state where the elastic body 30 is not compressed in the axial direction.

Description

  The present invention relates to a sealing device that performs a sealing function by extruding a resin ring in an axial direction from a housing so as to be slidable against a rotating, reciprocating or swinging counterpart surface.

  Conventionally, a sealing device as illustrated in FIG. 6 or FIG. 8 is known as a sealing means for a device that connects a flow path through a sphere having a through hole so as to be rotatable or swingable.

  Among these, the sealing device 100 shown in FIG. 6 includes a housing 110 in which an inner peripheral hole 111 is formed, a resin ring 101 made of a synthetic resin that is axially movable on the inner periphery of the housing 110, and the resin ring. 101 and an O-ring 102 disposed between a radial step surface 112 formed in the vicinity of the opening end of the inner peripheral hole 111 of the housing 110, and is urged in the axial direction by the compression elasticity of the O-ring 102. The tip of the resin ring 101 is slidably in close contact with the surface of the spherical valve body 120. The spherical valve body 120 has a through-hole 121 and is rotated around an axis (not shown) extending in a direction orthogonal to the through-hole 121, so that the inner peripheral hole 111 and the resin ring 101 of the housing 110 are rotated. The flow path by the inner peripheral hole 101a and the through hole 121 of the spherical valve body 120 are connected to each other or blocked to open and close the flow path (for example, see Patent Documents 1 and 2 below).

  Also, the sealing device 200 shown in FIG. 8 is basically the same as the above-described sealing device 100, and the housing 210 in which the inner peripheral hole 211 is formed and the opening end portion in the inner periphery of the housing 210 in the axial direction. A resin ring 201 made of synthetic resin that is movably disposed, a metal coil spring 202 disposed between the resin ring 201 and the radial step surface 212 formed in the inner peripheral hole 211, and a resin ring An O-ring 203 made of a rubber-like elastic material that is mounted in an annular groove 201a formed on the outer peripheral surface of 201 and seals between the inner peripheral surface of the housing 210 is provided. The tip of the urged resin ring 201 is slidably in close contact with the surface of the spherical valve body 220 having the through hole 221.

Japanese Patent Laid-Open No. 5-60251 JP 2001-254849 A

  However, in the sealing device 100 shown in FIG. 6, the resin ring 101 is held on the inner periphery of the housing 110 in a mounted state in which the resin ring 101 is slidably in contact with the surface of the spherical valve body 120. Since the resin ring 101 does not have a tightening margin with respect to the inner peripheral surface of the housing 110, the O-ring 102 and the resin ring 101 are not easily held on the inner periphery of the housing 110 in the unmounted state shown in FIG. For this reason, there is a problem that the O-ring 102 and the resin ring 101 are easily dropped from the housing 110 at the time of assembly, and the mounting operation is difficult.

  Also, the sealing device 200 shown in FIG. 8 is the same, and when not attached, the resin ring 201 is pushed out by the extension of the coil spring 202 as shown in FIG. There is a problem that is difficult.

  The present invention has been made in view of the above points, and the technical problem thereof is a sealing device having a structure in which a resin ring is pushed out from a housing in an axial direction so as to be slidably in contact with a mating surface. It is to improve the workability of mounting.

  As a means for effectively solving the technical problem described above, a sealing device according to the invention of claim 1 includes a housing, a resin ring disposed on the inner periphery of the housing so as to be axially movable, and the housing. An elastic body disposed on the inner periphery and biasing the resin ring in the axial direction to push it out of the housing, and a support means provided on the resin ring, the support means being inserted into the inner periphery of the housing It is possible to support the resin ring while maintaining the state of insertion into the inner periphery of the housing in the axially uncompressed state of the elastic body.

  According to a second aspect of the present invention, there is provided the sealing device according to the first aspect, wherein the support means includes a cylindrical portion that extends from the resin ring and can be inserted between the inner periphery of the housing and the outer periphery of the elastic body. Is.

  A sealing device according to a third aspect of the present invention is the sealing device according to the first or second aspect, wherein the support means is composed of a packing interposed in a radially compressed state between the housing and the resin ring. is there.

  According to the sealing device of the present invention, even when the elastic body is in the axially uncompressed state, the resin ring pushed out to the outside of the housing is supported by the housing by the supporting means inserted into the inner periphery of the housing. Therefore, it is possible to prevent the resin ring and the elastic body from dropping from the housing during the mounting operation to the device, and to improve the mounting workability.

It is sectional drawing of the mounting state which cut | disconnects and shows 1st embodiment of the sealing device which concerns on this invention by the plane which passes along an axial center. It is sectional drawing of the unmounted state which cut | disconnects and shows 1st embodiment of the sealing device which concerns on this invention by the plane which passes along an axial center. It is sectional drawing of the unmounted state which cut | disconnects and shows 2nd embodiment of the sealing device which concerns on this invention by the plane which passes along an axial center. It is sectional drawing of the unmounted state which cut | disconnects and shows 3rd embodiment of the sealing device which concerns on this invention by the plane which passes along an axial center. It is sectional drawing of the unmounted state which shows 4th Embodiment of the sealing device concerning this invention cut | disconnected by the plane which passes along an axial center. It is sectional drawing of the mounting state which shows an example of the sealing device by a prior art cut | disconnected and shown by the plane which passes along an axial center. It is sectional drawing of the unmounted state which shows an example of the sealing device by a prior art cut | disconnected and shown by the plane which passes along an axial center. It is sectional drawing of the mounting state which cuts and shows the other example of the sealing device by a prior art by the plane which passes along an axial center. It is sectional drawing of the unmounted state which cuts and shows the other example of the sealing device by a prior art by the plane which passes along an axial center.

  Hereinafter, preferred embodiments of a sealing device according to the present invention will be described with reference to the drawings. First, FIG. 1 and FIG. 2 show a first embodiment.

  In the first embodiment, the sealing device 1 includes a housing 10 in which an inner peripheral hole 11 is formed, a resin ring 20 disposed in the inner peripheral hole 11 of the housing 10 so as to be axially movable, A coil spring 30 as an elastic body that is arranged in the hole 11 and urges the resin ring 20 in the axial direction to push it out of the housing 10, and compression between the inner peripheral surface of the housing 10 and the outer peripheral surface of the resin ring 20. An O-ring 40 interposed in a state is provided.

  The resin ring 20 is made of synthetic resin such as PTFE (polytetrafluoroethylene) or polyamide, and is formed in a substantially cylindrical shape, that is, has an inner peripheral hole 21 penetrating in the axial direction. As shown in FIG. 1, a conical sliding surface 20a is formed at the outer end of the resin ring 20 so as to be slidably in contact with the surface of a spherical valve body 2 having a through hole 2a. . A radial step surface 12 is formed in the inner peripheral hole 11 of the housing 10, and the resin ring 20 is inserted outside (larger diameter side) of the inner peripheral hole 11 than the radial step surface 12. The outer end side (sliding surface 20 a side) is arranged in a state of protruding outward from the opening end portion 10 a of the housing 10.

  The coil spring 30 corresponds to the elastic body described in claim 1, and the radial step surface 12 of the inner peripheral hole 11 of the housing 10 and the back surface of the resin ring 20 (on the side opposite to the sliding surface 20 a). The resin ring 20 is urged to be pushed out from the inner periphery of the housing 10 to the outside by an extension force with respect to axial compression.

  An annular groove 22 is formed on the outer peripheral surface near the back surface 20 b of the resin ring 20, and the O-ring 40 is held in the annular groove 22.

  The O-ring 40 corresponds to the support means described in claim 1 and the packing described in claim 3, and is made of NBR (nitrile rubber), FKM (fluoro rubber), EPDM (ethylene propylene rubber), or the like. It is made of a rubber-like elastic material (rubber material or synthetic resin material having rubber-like elasticity), and the bottom surface of the annular groove 22 of the resin ring 20 and the inner peripheral surface outside (larger diameter side) than the radial step surface 12 of the housing 10. 11a is interposed in a state compressed in the radial direction. The O-ring 40 seals the gap between the inner peripheral surface of the housing 10 and the outer peripheral surface of the resin ring 20, and the bottom surface of the annular groove 22 of the resin ring 20 and the housing 10 due to the compression reaction force in the radial direction. The resin ring 20 is inserted into the inner periphery of the housing 10 in a non-compressed state of the coil spring 30 by the frictional force with both of the inner peripheral surfaces 11a and the resin ring 20 is supported by the housing 10. is there.

  As shown in FIG. 1, the sealing device 1 according to the first embodiment configured as described above includes an inner peripheral hole 11 of the housing 10 and an inner peripheral hole 21 of the resin ring 20 that communicates with the inner peripheral hole 11. A part of the flow path in the valve is configured, and the coil ring 30 is appropriately compressed in the axial direction by the resin ring 20 being pushed inward of the housing 10 from the position shown in FIG. The sliding surface 20a at the outer end of the resin ring 20 biased by force is slidably in close contact with the surface 2b of the spherical valve body 2 which is the mating surface. The spherical valve body 2 is rotated about a shaft center (not shown) extending in a direction orthogonal to the through hole 2a, for example, clockwise or counterclockwise in FIG. The flow path by the inner peripheral hole 21 of the resin ring 20 and the through hole 2a of the spherical valve body 2 are communicated with each other or blocked to open and close the flow path.

  In the unmounted state shown in FIG. 2, the bottom surface of the annular groove 22 of the resin ring 20 and the inner peripheral surface of the housing 10 even when the coil spring 30 extends in the axial direction or is slightly compressed. The O-ring 40 compressed in the radial direction between 11a has a function of restricting inadvertent axial movement of the resin ring 20 by a frictional force caused by a compression reaction force. For this reason, the insertion state of the resin ring 20 to the inner periphery of the housing 10 is maintained, that is, since the resin ring 20 is supported by the housing 10 via the O-ring 40, the resin is assembled in the process of assembling as shown in FIG. The ring 20 and the coil spring 30 can be prevented from falling off the housing 10, and as a result, the mounting workability can be improved.

  Next, FIG. 3 shows a second embodiment of the sealing device according to the present invention. In this embodiment, the difference from the first embodiment described above is that the supporting means for preventing the resin ring 20 and the coil spring 30 from dropping from the housing 10 is provided from the cylindrical portion 50 extending from the resin ring 20. It is in the point.

  Specifically, the cylindrical portion 50 is formed integrally with the resin ring 20, extends in a cylindrical shape from the outer diameter portion of the back surface 20 b thereof, and is not connected to the inner peripheral surface 11 a on the opening end portion 10 a side of the housing 10. The coil spring 30 can be inserted between the compressed coil spring 30 and the vicinity of the outer end.

  In this example, the axial length from the sliding surface 20a of the resin ring 20 to the rear end 50a of the cylindrical portion 50 is the axis of the resin ring 20 in the first embodiment shown in FIGS. Accordingly, the axial length of the main body portion of the resin ring 20 (the axial length from the sliding surface 20a to the back surface 20b) is the axial length of the resin ring 20 of the first embodiment. It is shorter than that.

  In the sealing device 1 according to the second embodiment configured as described above, the resin ring 20 is pushed inward of the housing 10 from the position shown in FIG. 3 in the mounted state, as in the first embodiment. Thus, the coil spring 30 is appropriately compressed in the axial direction, and the O-ring 40 is interposed between the bottom surface of the annular groove 22 of the resin ring 20 and the inner peripheral surface 11a of the housing 10 in a radially compressed state. The sliding surface 20a at the outer end of the resin ring 20 biased by the compression reaction force of the spring 30 is in close contact with the surface of the spherical valve body 2 (see FIG. 1) so as to be slidable.

  Even if the coil spring 30 extends in the axial direction in the unmounted state, the cylindrical portion 50 formed on the resin ring 20 is not attached to the inner peripheral surface 11 a on the opening end portion 10 a side of the housing 10 and the coil spring 30. The resin ring 20 and the coil spring 30 are removed from the housing 10 in the process of assembling to the ball valve or the like in order to support the resin ring 20 to the housing 10 by being inserted between the outer periphery in the vicinity of the end. As a result, mounting workability can be improved.

  In addition, the resin ring 20 and the coil spring 30 are prevented from falling off by providing an allowance in the radial direction between the bottom surface of the annular groove 22 of the resin ring 20 and the inner peripheral surface 11a of the housing 10. Therefore, the axial depth (the axial length of the inner peripheral surface 11a) of the radial step surface 12 from the opening end portion 10a of the housing 10 is the same as that of the first embodiment shown in FIGS. There is also an advantage that it can be made shorter than the object.

  Next, FIG. 4 shows a third embodiment of the sealing device according to the present invention. In this embodiment, the cylindrical portion 50 in the second embodiment described above is manufactured from metal or the like and integrated with the resin ring 20 by fitting or bonding.

  Specifically, the cylindrical portion 50 is between the relatively small diameter bonded cylindrical portion 51 bonded to the inner peripheral surface of the resin ring 20, and the inner peripheral surface 11 a of the housing 10 and a portion near the outer end of the coil spring 30. The insertion cylinder part 52 has a relatively large diameter that can be inserted, and a disk part 53 that extends in the radial direction between the joining cylinder part 51 and the insertion cylinder part 52 and is joined to the back surface 20 b of the resin ring 20. The joining cylinder portion 51 has a length that does not reach the sliding surface 20 a of the resin ring 20, and the disc portion 53 forms a part of the annular groove 22 in which the O-ring 40 is mounted and the urging force of the coil spring 30. It functions as a spring retainer.

  According to this configuration, the same effect as in the second embodiment is realized. That is, even when the coil spring 30 is fully extended in the unmounted state, the insertion tube portion 52 in the tubular portion 50 is in the vicinity of the inner peripheral surface 11a on the opening end portion 10a side of the housing 10 and the outer end of the coil spring 30. Since the resin ring 20 is supported by the housing 10 by being inserted between the outer periphery of the portion, the resin ring 20 and the coil spring 30 are prevented from falling off the housing 10 during the assembly process to the ball valve or the like. As a result, the mounting workability can be improved.

  In addition, since the cylindrical portion 50 is made of metal, the rigidity of the cylindrical portion 50 can be improved compared to that of the second embodiment shown in FIG. The rigidity of the resin ring 20 can also be improved.

  Next, FIG. 5 shows a fourth embodiment of the sealing device according to the present invention. In this embodiment, as in the third embodiment described above, the cylindrical portion 50 is made of metal or the like and integrated with the resin ring 20 by fitting or bonding. The difference from the third embodiment is that the cylindrical portion 50 is formed in a substantially L-shaped cross section including an insertion cylindrical portion 52 and a disk portion 53 joined to the back surface 20b of the resin ring 20. . The joining surface 53a of the disk part 53 joined to the back surface 20b of the resin ring 20 is formed in a step shape in order to increase the joining strength.

  According to this configuration, the same effects as those of the third embodiment are realized, and the shape of the cylindrical portion 50 is simple, so that the processing is easy, and compared with the third embodiment. And can be provided at low cost.

  In each of the above-described embodiments, the coil spring 30 is used as an elastic body that urges the resin ring 20 in the axial direction and pushes the resin ring 20 out of the housing 10. The present invention can be carried out even using the above.

  Also in the second to fourth embodiments shown in FIG. 3 to FIG. 5, the radial direction between the bottom surface of the annular groove 22 of the resin ring 20 and the inner peripheral surface 11 a of the housing 10, as in FIG. 2. By being interposed in a compressed state, the resin ring 20 and the coil spring 30 function as support means for preventing the resin ring 20 and the coil spring 30 from dropping from the housing 10. May be given.

DESCRIPTION OF SYMBOLS 1 Sealing device 10 Housing 10a Open end 11 Inner peripheral hole 11a Inner peripheral surface 12 Radial step surface 20 Resin ring 20a Sliding surface 20b Rear surface 21 Inner peripheral hole 22 Annular groove 30 Coil spring (elastic body)
40 O-ring 50 Tubular part 50a Rear end part 51 Joining cylinder part 52 Insertion cylinder part 53 Disk part 53a Joining surface

Claims (3)

  A housing, a resin ring arranged on the inner circumference of the housing so as to be axially movable, and an elastic body arranged on the inner circumference of the housing to urge the resin ring in the axial direction and push it out of the housing; Support means provided on the resin ring is provided, and the support means can be inserted into the inner periphery of the housing, and the insertion state of the elastic body in the inner periphery of the housing is maintained in an axially uncompressed state. And a sealing device for supporting the resin ring.   2. The sealing device according to claim 1, wherein the supporting means is formed of a cylindrical portion that can be inserted between the inner periphery of the housing and the outer periphery of the elastic body by extending the supporting means from the resin ring.   The sealing device according to claim 1 or 2, wherein the supporting means comprises a packing interposed in a radially compressed state between the housing and the resin ring.

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