JP3196932U - Sealing device - Google Patents

Abstract

A sealing device capable of ensuring stable sealing performance by effectively suppressing deterioration of a sealing portion even when used for a long time by optimizing a sealing structure between an outer peripheral portion of the sealing device and a housing. I will provide a. A sealing device (1) accommodates an elastomer first seal ring member (10) having a first seal lip portion (11) slidably contactable with an outer peripheral surface of a rotary shaft (60), and at least a part of the first seal ring member. The cylindrical case 20 includes a seal coating layer 13 that covers the outer peripheral surface of the cylindrical case, and the outer peripheral surface of the seal coating layer is formed as a plurality of annular protrusions 14. To do. [Selection] Figure 2

Description

  The present invention seals between a housing having a shaft hole and a rotating shaft fitted in the shaft hole of the housing, thereby preventing leakage of the sealed fluid accommodated in the sealed space to the atmosphere side. The present invention relates to a sealing device for preventing.

  As a conventional sealing device, for example, a sealing ring member that is used to seal around the rotating shaft of a compressor in an air conditioner of an automobile and the like is slidably contacted with the outer peripheral surface of the rotating shaft, and the sealed state of the sealed space is set. Maintaining sealing devices are known. The seal ring member that constitutes such a seal device is made of an elastomer material such as rubber having excellent sealing performance, and the seal lip portion that constitutes the tip of the seal ring member is always in contact with the outer peripheral surface of the rotating shaft. The refrigerant gas or lubricating oil, which is the sealed fluid filled in the internal space of the compressor to be sealed, is sealed to make the internal space a sealed space, and the sealed fluid is externally connected from the internal space. To prevent leakage.

  As shown in FIG. 1, the conventional sealing device 100 includes an elastomer first seal ring member 110 having a first seal lip portion 111 slidably contactable with the outer peripheral surface of the rotating shaft 160, and the first seal ring member. The first seal ring member 110 has a thickness extending radially outward from one end of the first seal lip 111 on the atmosphere Y side. It further includes a meat base 112 and a metal reinforcing ring 170 embedded in the thick base 112.

  The cylindrical case 120 has an annular recess 121 for mounting an elastically deformable O-ring 180 in close contact with the inner peripheral surface 152 of the shaft hole 151 on the outer peripheral side, and the O-ring 180 is mounted on the annular recess 121. By fitting the sealing device 100 into the shaft hole 151 of the housing 150 in this state, the sealing performance between the outer peripheral portion of the sealing device 100 and the housing 150 is ensured through the O-ring 180 positioned therebetween. be able to. The outer diameter of the O-ring 180 is usually set somewhat larger than the maximum outer diameter of the cylindrical case 120, and when the sealing device 100 is fitted in the shaft hole 151 of the housing 150, the O-ring 180 is The outer peripheral surface of the sealing device 100 is elastically compressed and deformed to substantially the same diameter, and is tightly attached to the outer peripheral portion of the sealing device 100 and the housing 150.

  In the conventional sealing device 100, the O-ring 180 is an essential component in order to obtain a sealing property between the outer peripheral portion and the housing 150. However, the O-ring 180, for example, in a high temperature environment, tends to be deteriorated and deteriorated with the passage of use time particularly on the atmosphere Y side in contact with outside air. Thereby, the sealing performance between the outer peripheral part of the sealing device 100 and the housing 150 is deteriorated, and in the worst case, the fluid in the sealed space may leak to the atmosphere Y side.

  The purpose of the present invention is to optimize the seal structure between the outer peripheral portion of the seal device and the housing, thereby effectively suppressing deterioration of the seal portion even when used for a long period of time and ensuring stable sealing performance. It is in providing a sealing device.

  In order to achieve the above object, the gist of the present invention is as follows.

(1) A sealing device that seals a fluid in a sealed space by sealing between a housing having a shaft hole and a rotating shaft fitted in the shaft hole of the housing, the outer periphery of the rotating shaft A sealing device comprising: a first seal ring member made of an elastomer having a first seal lip portion slidably contactable with a surface; and a cylindrical case containing at least a part of the first seal ring member. The case has a seal coating layer that covers an outer peripheral surface of the cylindrical case, and the outer peripheral surface of the seal coating layer is formed as a plurality of annular convex portions.

(2) The sealing device according to (1), wherein the number of the annular convex portions is two.

(3) The cylindrical case has a second seal lip portion that is located on the back side of the first seal ring member that is opposite to the sealed space and that can be slidably contacted with the outer peripheral surface of the rotating shaft. The above-mentioned (1), further containing a resin-made second seal ring member and a backup ring member that is located on the back side of the second seal ring member and supports the second seal ring member Or the sealing apparatus as described in (2).

(4) The first seal ring member and the seal coating layer are made of the same seal member, and the cylindrical case is embedded in the seal member to provide a reinforcing ring for reinforcing the first seal ring member. The sealing device according to (1), (2), or (3), wherein the sealing device is also used.

  According to the present invention, the cylindrical case has a seal coating layer that covers the outer peripheral surface of the cylindrical case, and the outer peripheral portion of the seal coating layer is formed as a plurality of annular convex portions, thereby providing a plurality of annular convex portions. Among them, the annular convex part on the sealed space side can prevent contact with the outside air due to the presence of the annular convex part on the atmosphere side, and the sag due to the degradation of the annular convex part on the sealed space side is effectively suppressed, It has become possible to provide a sealing device that can be stably obtained without substantially reducing the sealing performance between the outer peripheral portion of the sealing device and the housing even when used for a long period of time.

FIG. 1 is a half cross-sectional view of a conventional sealing device using an O-ring, and shows an arrangement position of a rotating shaft when fitted in a shaft hole of a housing by a virtual line. FIG. 2 is a half cross-sectional view of the sealing device of the present invention, and shows the disposition position of the rotary shaft when it is fitted in the shaft hole of the housing by a virtual line.

  Next, embodiments of the present invention will be described below with reference to the drawings.

  FIG. 2 shows only a half of the longitudinal section of the sealing device 1 according to the present invention.

  The sealing device 1 shown in FIG. 2 mainly includes a first seal ring member 10 and a cylindrical case 20.

  The first seal ring member 10 is made of an elastomer, and extends radially outward from one end of the first seal lip portion 11 and the first seal lip portion 11 on the atmosphere Y side in the embodiment shown in FIG. It consists of a thick base 12. The first seal lip portion 11 includes a lip tip portion 11a that can slide in contact with the outer peripheral surface of the rotary shaft 60, and a first cylindrical portion 11b that is formed concentrically and cylindrically on the outer peripheral side of the rotary shaft 60. Yes.

  The lip tip portion 11 a of the first seal lip portion 11 that contacts the outer peripheral surface of the rotation shaft 60 extends inclined toward the sealing space X toward the rotation shaft 60 and rotates about the rotation axis 61. The outer peripheral surface of 60 is elastically deformed so as to be in close contact with a small contact area so as to have a low contact resistance. By increasing the surface pressure of the lip tip portion 11a of the first seal lip portion 11 with respect to the outer peripheral surface of the rotating shaft 60, a sealing function is exhibited, and a sealed space is formed between the inner peripheral portion of the sealing device 1 and the rotating shaft 60. Leakage of the sealed fluid from X to the atmosphere Y side can be prevented.

  The cylindrical case 20 is made of metal and accommodates at least a part of the first seal ring member 10. As shown in FIG. 2, the cylindrical case 20 has a second cylindrical portion 21 formed concentrically and cylindrically on the outer peripheral side of the rotating shaft 60. At the end portion of the second cylindrical portion 21 on the sealed space X side, the first inward end portion 22 bent inward in the radial direction and the end portion on the atmosphere Y side of the second cylindrical portion 21 by caulking And a second inward end portion 23 bent inward in the radial direction.

  Moreover, the sealing device 1 shown in FIG. 2 is a back surface side of the first seal ring member 10 from the viewpoint of further improving the sealing performance between the inner peripheral portion of the sealing device 1 and the outer peripheral surface of the rotating shaft 60 (see FIG. 2 shows an example of an embodiment including a resin-made second seal ring member 30 having a second seal lip portion 31 that is located on the atmosphere Y side) and that can be slidably contacted with the outer peripheral surface of the rotating shaft 60. The second seal lip portion 31 extends inclined toward the sealed space X toward the rotation shaft 60. When the rotary shaft 60 is fitted in the shaft hole 51 of the housing 50 to which the seal device 1 is mounted, the second seal lip portion 31 is elastic like the first seal lip portion 11 of the first seal ring member 10. It deform | transforms and it will be in the state closely_contact | adhered to the outer peripheral surface of the rotating shaft 60 so that sliding contact is possible.

  The illustrated second seal ring member 30 further includes a fixed end portion 32 that extends radially outward from the second seal lip portion 31 and is fixed within the cylindrical case 20 of the seal device 1.

  The material of the second seal ring member 30 is not particularly defined, but it is preferable to use a low friction synthetic resin material such as polytetrafluoroethylene (PTFE).

  The sealing device 1 shown in FIG. 2 further has a backup ring member 40. The backup ring member 40 is made of metal, is located on the back side of the second seal ring member 30, and supports the second seal ring member 30 from the back side to limit the deformation thereof. The backup ring member 40 extends in close contact with the back surface of the fixed end portion 32 of the second seal ring member 30, and is fixed to be fixed by sandwiching the fixed end portion 32 together with the thick base portion 12 of the first seal ring member 10. Part 41, a third cylindrical part 42 extending from the radially outer end of the annular fixing part 41 toward the atmosphere Y side and concentrically with the rotary shaft 60, and the third cylinder And an outward end 43 that extends radially outward from the portion 42.

  The main feature of the configuration of the present invention is that the cylindrical case 20 has a seal coating layer 13 that covers the outer peripheral surface of the cylindrical case 20, and the outer peripheral portion of the seal coating layer 13 has a plurality of annular protrusions. By adopting this configuration, among the plurality of annular protrusions 14, the annular protrusion 14a on the sealed space X side is separated from the outside air by the presence of the annular protrusion 14b on the atmosphere Y side. Can be prevented, the sag caused by the deterioration of the annular convex portion 14a on the sealed space X side is suppressed, and a long-term stable sealing performance between the outer peripheral portion of the sealing device 1 and the housing 50 is achieved. be able to.

  The seal coating layer 13 is made of rubber and fits closely with the shaft hole 51. The seal coating layer 13 may be bonded to the second cylindrical portion 21 of the cylindrical case 20 by vulcanization adhesion, and the seal coating layer 13 is composed of the same seal member as the first seal ring member 10. The cylindrical case 20 may be embedded in the seal member. With this configuration, the seal between the outer peripheral portion of the seal device 1 and the housing 50 and the seal between the inner peripheral portion of the seal device 2 and the rotary shaft 60 can be achieved by the first seal ring member 10 alone. it can. The sealing device 1 shown in FIG. 2 is an embodiment in which a cylindrical case 20 is embedded in the first seal ring member 10. By embedding the cylindrical case 20 in the first seal ring member 10, the cylindrical case 20 can also serve as a reinforcing ring that reinforces the first seal ring member 10. The cylindrical case 20 has not only a holding and holding function for the first seal ring member 10, the second seal ring member 30 and the backup ring member 40, but also a reinforcing function for the first seal ring member 10, so that the sealing device 1. Simplification of the configuration can be achieved.

  The plurality of annular protrusions 14 a and 14 b shown in FIG. 2 are formed at intervals from each other along the rotation axis 61 of the rotation shaft 60. The maximum outer diameter positions of the illustrated annular convex shapes 14a and 14b are set slightly larger than the maximum inner diameter position of the inner peripheral surface 52 of the shaft hole 51 of the housing 50. However, the annular convex portions 14a and 14b When 1 is fitted in the shaft hole 51 of the housing 50, it is elastically deformed to substantially the same diameter as the outer peripheral surface of the seal coating layer 13 and is firmly fixed.

  Further, the illustrated sealing device 1 shows a case where the number of the annular protrusions 14 formed on the outer peripheral portion of the seal coating layer 13 is two, which is the minimum number that can achieve the effects of the present invention. However, if there is a need to more reliably maintain the sealing performance between the outer peripheral portion of the sealing device 1 and the housing 50 over a longer period, the number may be three or more.

  The above description is merely an example of an embodiment of the present invention, and various modifications can be made within the scope of the utility model registration request.

  According to the present invention, among the plurality of annular convex portions, the annular convex portion on the sealed space side can prevent contact with the outside air due to the presence of the annular convex portion on the atmospheric side, and the annular convex portion on the sealed space side is deteriorated. Since the sag caused by is effectively suppressed, the sealing performance between the outer periphery of the sealing device and the housing can be provided stably without substantially deteriorating even after long-term use. Became.

DESCRIPTION OF SYMBOLS 1 Sealing device 10 1st seal ring member made from elastomer 11 1st seal lip part 11a Lip part tip part 11b 1st cylindrical part 12 Thick base 13 Seal covering layer 14 Annular convex part 14a Annular convex part 14b on the sealed space side Atmosphere Side annular convex portion 20 Metal cylindrical case 21 Second cylindrical portion 22 First inward end portion 23 Second inward end portion 30 Resin second seal ring member 31 Second seal lip portion 32 Fixed end portion Reference Signs List 40 backup ring member 41 annular fixing portion 42 third cylindrical portion 43 outward end portion 50 housing 51 shaft hole 52 inner peripheral surface of shaft hole 60 rotating shaft 61 rotating axis 100 sealing device 110 first seal ring member 111 first seal lip Part 112 Thick base 140 Metal reinforcing ring 150 Housing 151 Shaft hole 152 Inner peripheral surface of shaft hole 160 Rotating shaft 1 70 O-ring 180 Cylindrical case 181 Annular recess X Sealed space Y Atmosphere

Claims (4)

A sealing device that seals a fluid in a sealed space by sealing between a housing having a shaft hole and a rotating shaft fitted in the shaft hole of the housing,
A first seal ring member made of elastomer having a first seal lip portion slidably contactable with the outer peripheral surface of the rotating shaft;
In a sealing device comprising a cylindrical case that houses at least a part of the first seal ring member,
The cylindrical case has a seal coating layer covering the outer peripheral surface of the cylindrical case,
An outer peripheral surface of the seal coating layer is formed as a plurality of annular protrusions.   The sealing device according to claim 1, wherein the number of the annular protrusions is two. The cylindrical case is
A second seal ring member made of a resin having a second seal lip portion which is located on the back side opposite to the sealed space of the first seal ring member and has a second seal lip portion which can be slidably contacted with an outer peripheral surface of the rotating shaft; ,
The seal device according to claim 1, further comprising a backup ring member that is located on a back surface side of the second seal ring member and supports the second seal ring member. The first seal ring member and the seal coating layer are made of the same seal member,
4. The sealing device according to claim 1, wherein the cylindrical case also serves as a reinforcing ring that is embedded in the sealing member and reinforces the first sealing ring member. 5.

Images