JP2012047265A - Shaft sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shaft sealing device in which the sealing performance between the inner periphery of the seal sleeve and the outer periphery of the rotating shaft is secured and which can exhibit genuine sealing function without a sealing device displacing from the predetermined position.SOLUTION: The shaft sealing device 10 for sealing between the housing 1 and the rotating shaft 2 has the seal sleeve 11 fitted and attached to the outer periphery of the rotating shaft 2, the lip seal assembly 12 in which the lip 18A, 19a in the inner peripheral side slidably contact the outer periphery of the seal sleeve 11 and the outer periphery abuts on the rotating shaft passing through-hole 3 peripheral wall of the housing 1, the O-ring accommodating part 13 swelled outward in a radial direction is formed in the sealed fluid side L of the seal sleeve 11.

Description

  The present invention relates to a shaft seal device that seals between a housing and a rotary shaft, and in particular, a compressor used in an air conditioner for automobiles, or a lip seal type that seals between a housing and a rotary shaft such as a general-purpose compressor. The present invention relates to a shaft seal device.

As a conventional lip seal type shaft seal device, the one shown in FIG. 4 is known (hereinafter referred to as “prior art”; for example, see Patent Document 1).
This prior art shaft seal device includes a first seal lip 51 made of a rubber material having a fitting portion 52 that can be fitted into the shaft through hole 61 of the housing 60, and a first seal on the inner periphery of the fitting portion 52. A second seal lip 53 made of a resin material arranged in parallel with the lip 51 is provided, and a reinforcing ring 54 is embedded in the fitting portion 52 to reinforce the fitting portion 52, and the L-shaped ring 55 is second sealed. A seal assembly 50 formed in contact with and fixed to the lip 53 is closely fitted to a seal sleeve 63 fitted to the rotary shaft 62. Both ends of the seal sleeve 63 are bent outward, the first stopper 64 is U-shaped so as to wrap the first seal lip 51, and the second stopper 65 is fitted to the seal sleeve 63 by the seal assembly 50. After being combined, it is bent.
A thin cylindrical seal ring 66 made of rubber or resin is provided on the inner peripheral surface of the seal sleeve 63 and coated in a sheet shape so that the sealed fluid L does not leak to the outside A.

In the shaft seal device of the prior art shown in FIG. 4, since the seal sleeve 63 is provided, there is a merit that it is not necessary to finish the outer peripheral surface of the rotary shaft 62 on which the seal assembly 50 is disposed. Since a thin cylindrical seal ring 66 is provided to seal between the inner peripheral surface and the outer peripheral surface of the rotary shaft 62, the position where the seal sleeve 63 is disposed is long from the end of the rotary shaft 62. Then, when the seal sleeve 63 is fitted to the rotating shaft 62, there is a problem that the seal ring 66 is worn and cannot serve as a seal.
In addition, when the shaft seal device of the prior art is mounted on a compressor used for an air conditioner of an automobile, the shaft seal device is drawn toward the crank chamber side of the compressor when the inside of the compressor is evacuated to contain the refrigerant, and the seal Since the fitting portion 52 of the assembly 50 is displaced from a predetermined position of the shaft through hole 61 of the housing 60, there is a problem that the lip seal function cannot be exhibited.

JP 2006-183852 A

  The present invention has been made to solve the above-described problems of the prior art, and in a lip seal type shaft seal device, it is possible to rotate the inner peripheral surface of the seal sleeve without providing a thin cylindrical seal ring. A shaft seal device that ensures the sealing performance between the outer peripheral surfaces of the shafts and can perform the original sealing function without shifting the shaft seal device from a predetermined position even when the inside of the compressor is evacuated to contain the refrigerant. The purpose is to provide.

  In order to achieve the above object, a shaft seal device according to the present invention is, firstly, in a shaft seal device for sealing between a housing and a rotary shaft, a seal sleeve fitted to the outer peripheral surface of the rotary shaft; A lip seal assembly in which an inner peripheral lip portion is in sliding contact with the outer peripheral surface of the seal sleeve and an outer peripheral portion is in contact with a peripheral wall of the rotation shaft through hole of the housing; It is characterized in that an O-ring housing portion bulging in the direction is formed.

  According to the first feature, the seal between the inner peripheral surface of the seal sleeve and the outer peripheral surface of the rotary shaft is held by the O-ring housing portion without providing a thin cylindrical seal ring as in the prior art. It can be done reliably. Further, by providing the O-ring housing portion bulging radially outward, the lubricating oil can be stored in the vicinity of the sliding portion between the outer peripheral surface of the seal ring and the lip member of the lip seal assembly.

  The shaft seal device according to the present invention is secondly characterized in that, in the first feature, the lip seal assembly is prevented from moving to the sealed fluid side via a cylindrical spacer disposed on the sealed fluid side. It is characterized by being.

  According to the second feature, even when the inside of the compressor is evacuated due to the refrigerant filling, the shaft seal device can exhibit its original sealing function without being displaced from a predetermined position.

  Thirdly, in the first or second aspect of the shaft seal device of the present invention, the cylindrical spacer has a lubricating oil in the vicinity of a position where the seal sleeve and the lip portion of the lip seal assembly are in sliding contact with each other. It is characterized in that an introduction hole for introducing the is formed.

  According to the third feature, the lubricating oil can be supplied to the sliding contact position between the seal sleeve and the lip portion of the lip seal assembly.

The present invention has the following excellent effects.
(1) By forming an O-ring housing portion bulging outward in the radial direction on the sealed fluid side of the seal sleeve, the seal sleeve can be provided without providing a thin cylindrical seal ring as in the prior art. The seal between the inner peripheral surface of the shaft and the outer peripheral surface of the rotary shaft can be reliably performed by the O-ring held in the O-ring housing portion. Further, by providing the O-ring housing portion bulging outward in the radial direction, the lubricating oil can be stored in the vicinity of the sliding portion between the outer peripheral surface of the seal ring and the lip portion of the lip seal assembly.

(2) The lip seal assembly is prevented from moving to the sealed fluid side through a cylindrical spacer disposed on the sealed fluid side, so that the compressor is evacuated to contain the refrigerant. In addition, the original sealing function can be exhibited without the shaft seal device deviating from the predetermined position.
(3) An introduction hole for introducing lubricating oil is formed in the cylindrical spacer in the vicinity of a position where the seal sleeve and the lip portion of the lip seal assembly are in sliding contact with each other, so that the seal sleeve and the lip seal assembly are Lubricating oil can be supplied to the sliding contact position with the lip portion.

It is a front view showing the state where the shaft seal device concerning the embodiment of the present invention was equipped, and the upper part of a figure shows the section of the shaft seal device. It is sectional drawing of the lip seal assembly of the shaft seal apparatus which concerns on embodiment of this invention. In the shaft seal device concerning the embodiment of the present invention, it is an explanatory view explaining the assembly of a seal sleeve and a lip seal assembly, (a) is the state before the assembly, (b) is the state after the assembly Is shown. It is front sectional drawing which shows a prior art.

  The embodiment for carrying out the shaft seal device according to the present invention will be described in detail with reference to the drawings, but the present invention should not be construed as being limited to this, so long as it does not depart from the scope of the present invention. Various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art.

  FIG. 1 is a front view showing a state where a shaft seal device according to an embodiment of the present invention is mounted, and the upper side shows a cross-section of the shaft seal device, and FIG. 2 shows an embodiment of the present invention. It is sectional drawing of the lip seal assembly of the shaft seal apparatus which concerns on.

In FIG. 1, a housing 1 such as a compressor is provided with a rotation shaft through hole 3 for inserting a rotation shaft 2. The rotation shaft 2 is inserted into the rotation shaft through hole 3, and the rotation shaft 2 is driven by a bearing (not shown). Is supported with a required clearance from the peripheral wall of the rotary shaft through hole 3.
A shaft seal device 10 is disposed between the rotary shaft 2 and the peripheral wall of the rotary shaft through hole 3 to seal the sealed fluid side L and the atmosphere side A.
In FIG. 1, the right side is a sealed fluid side L such as a crank chamber of a compressor, and the left side is an atmosphere side A.

  The shaft seal device 10 includes a seal sleeve 11 fitted to the outer peripheral surface of the rotary shaft 2, and a lip portion, which will be described later, in sliding contact with the outer peripheral surface of the seal sleeve 11, and the outer peripheral portion contacts the peripheral wall of the rotary shaft through hole 3 of the housing 1. The lip seal assembly 12 is in contact with the spacer, and the spacer 30 prevents the lip seal assembly 12 from moving in the axial direction.

The seal sleeve 11 is made of stainless steel or resin, and has a cylindrical shape. In this seal sleeve 11, an O-ring accommodating portion 13 bulging radially outward from the outer peripheral surface of the rotary shaft 2 is formed on the side where the lip portion described later comes into sliding contact, that is, on the right side of the seal sleeve 11. Yes. The O-ring housing part 13 includes a vertical step part 14, a large diameter part 15, and a bent part 16. When the seal sleeve 11 is fitted to the rotary shaft 2, the O-ring 17 is attached to the O-ring housing portion 13. Therefore, unlike the prior art, the seal between the inner peripheral surface of the seal sleeve 11 and the outer peripheral surface of the rotary shaft 2 can be reliably performed by the O-ring 17 without providing a thin cylindrical seal ring.
The end 25 of the seal sleeve 11 opposite to the O-ring housing portion 13 has a straight shape until it is assembled with the lip seal assembly 12, but after the assembly with the lip seal assembly 12 is finished, it is shown in FIG. So that it is bent outward by caulking.

  As shown in FIG. 2, the lip seal assembly 12 includes a first seal lip 18 made of a rubber material, a second seal lip 19 made of a resin material arranged in parallel with the first seal lip 18, and a first seal lip 18. A reinforcing ring 20, a backup ring 21 disposed between the first seal lip 18 and the second seal lip 19, and a backup ring 22 disposed behind the second seal lip 19 are provided.

The fitting portion 23 on the outer peripheral side of the first seal lip 18 is formed in a cylindrical shape, and this fitting portion 23 is fitted to the peripheral wall of the rotation shaft through hole 3 of the housing 1. The surface 24 is provided with a seal convex portion and is brought into close contact with the peripheral wall of the rotary shaft through hole 3 to seal the fluid to be sealed. Further, the inner peripheral side of the fitting portion 23 forms a cylindrical shape and protrudes toward the sealed fluid side L, and the tip thereof forms an annular lip portion 18A. The annular lip portion 18A is fitted to the outer peripheral surface of the seal sleeve 11, and a corner portion having a sharp cross section is elastically deformed to be intimately sealed to seal the fluid to be sealed.
Further, since the first seal lip 18 is a rubber-like elastic material, a reinforcing ring 20 is embedded in the fitting portion 23 for reinforcement. The reinforcing ring 20 is U-shaped, and the right bent ring portion 20A supports the base of the annular lip portion 18A. The left end holding portion 20B is crimped radially inward after the backup ring 22 is mounted.

  A second seal lip 19 made of a resin material is provided in parallel with the first seal lip 18 in close contact with the inner peripheral surface of the fitting portion 23. The second seal lip 19 has an L-shaped cross section, and a cylindrical lip portion 19A is formed on the inner peripheral side. The cylindrical lip portion 19A is in close contact with the outer peripheral surface of the seal sleeve 11 to seal the sealed fluid. The root on the outer peripheral side of the second seal lip 19 is sandwiched between a backup ring 21 and a backup ring 22 provided along the inner side of the annular lip portion 18A of the first seal lip 18. At the same time, the outer peripheral side of the backup ring 22 is supported by being held by the holding portion 20B at the left end of the reinforcing ring 20.

  The back-up ring 22 made of a metal-made L-shaped ring has a cylindrical portion on the outer peripheral side supported by the holding portion 20B of the reinforcing ring 20, and the inner peripheral side presses the second seal lip 19 toward the first seal lip 18 side. Then, the second seal lip 19 is sandwiched between the backup ring 21. The backup ring 22 is made of a material such as stainless steel, aluminum, or resin.

FIGS. 3A and 3B are explanatory views for explaining the assembly of the seal sleeve 11 and the lip seal assembly 12, wherein FIG. 3A shows a state before the assembly, and FIG. 3B shows a state after the assembly.
In FIG. 3A, a jig 26 having a tapered outer peripheral surface is connected to an end 25 opposite to the O-ring housing portion 13 side of the seal sleeve 11, and the small diameter portion of the jig 26 is used as the head. Gradually, it is inserted inside the lip seal assembly 12. As shown in FIG. 3B, when the seal sleeve 11 is inserted into the lip seal assembly 12 to a predetermined position, the jig 26 is removed from the seal sleeve 11, and the end 25 of the seal sleeve 11 is radially outward. It is caulked by The crimped end portion 25 also functions as a pushing portion when the shaft sealing device 10 is press-fitted into the rotating shaft 2.

  As shown in FIG. 1, the lip seal assembly 12 and the seal sleeve 11 are assembled with an annular lip portion 18 </ b> A and a cylindrical lip portion 19 </ b> A closely fitted to the outer peripheral surface of the seal sleeve 11. For this purpose, the lip seal assembly 12 and the seal sleeve 11 are coupled by a frictional force closely fitted. Even if the lip seal assembly 12 and the seal sleeve 11 are separated from each other by receiving a force stronger than the external force, on the one hand, the annular lip portion 18A of the first seal lip 18 is the O-ring accommodating portion 13 of the seal sleeve 11. On the other hand, the backup ring 22 is in contact with the end portion 25 that is crimped to the outside of the seal sleeve 11 to prevent the both from being detached. For this reason, the shaft seal device 10 can be stored in a state where the lip seal assembly 12 and the seal sleeve 11 are assembled. Moreover, when the shaft seal device 10 is assembled to the device, the problem that one of the parts is insufficient can be solved. In particular, when the seal sleeve 11 is made of a resin material, sliding with the annular lip portion 18A and the cylindrical lip portion 19A becomes good, which is excellent in that the sealed fluid is sealed.

  The outer peripheral surface of the seal sleeve 11 is formed smoothly when the seal sleeve 11 is manufactured by rolling a metal material, and is also formed smoothly when the seal sleeve 11 is manufactured by molding a resin. Therefore, it is not necessary to process the outer peripheral surface. Furthermore, by coating the outer peripheral surface of the seal sleeve 11 with a fluororesin or the like, a coating film is formed and the friction coefficient can be reduced.

  In FIG. 1, a holding ring 4 is fitted on one side of a rotary shaft through hole 3 of a housing 1 in which a shaft seal device 10 is disposed, and a partition wall that partitions a crank chamber of a compressor on the other side. 5 etc. are formed. Further, the housing 1 is formed with a lubricating oil supply hole 6 for supplying lubricating oil to the annular lip portion 18A and the like.

A spacer 30 is disposed between the compressor-side surface of the fitting portion 23 of the first seal lip 18 and the partition wall 5. In some cases, the partition wall 5 is not provided. In this case, the spacer 30 is set so that one end of the spacer 30 is locked to an end portion such as a bearing (not shown) that supports the rotating shaft 2.
The spacer 30 is made of, for example, a metal material and has a cylindrical shape. The diameter of the spacer 30 is slightly smaller than the outer diameter of the fitting portion 23 of the first seal lip 18. A flange 31 bent outward in the radial direction is formed on the side of the spacer 30 that contacts the fitting portion 23 of the first seal lip 18, and the flange 31 is connected to the fitting portion 23 of the first seal lip 18. Abut. In this example, a chamfered portion 32 bent inward in the radial direction is formed on the side of the spacer 30 that contacts the partition wall 5 and is in contact with the partition wall 5, but the chamfered portion 32 is formed. It may be a slate.

In the spacer 30, a lubricating oil introduction hole 33 for introducing lubricating oil is formed near the position where the seal sleeve 11 and the annular lip portion 18 </ b> A of the lip seal assembly 12 are in sliding contact with each other. The lubricating oil introduction hole 33 is not limited to a circular shape, and may be an oval shape or a rectangular shape. In short, the lubricating oil can be efficiently supplied to a position where the seal sleeve 11 and the annular lip portion 18A of the lip seal assembly 12 are in sliding contact. Any shape is acceptable.
The lubricating oil supplied through the lubricating oil introduction hole 33 lubricates the vicinity of the annular lip portion 18A, but since the O-ring accommodating portion 13 is provided in the seal sleeve 11, a part of the lubricating oil is accommodated in the O-ring. It is stored between the portion 13 and the annular lip portion 18A, and lubrication of the sliding portion between the outer peripheral surface of the seal sleeve 11 and the annular lip portion 18A of the lip seal assembly 12 is further improved.

DESCRIPTION OF SYMBOLS 1 Housing 2 Rotating shaft 3 Rotating shaft through-hole 4 Holding ring 5 Partition wall 6 Housing lubricating oil supply hole 10 Shaft seal device 11 Seal sleeve 12 Lip seal assembly 13 O-ring accommodating portion 14 Vertical step portion 15 Large diameter portion 16 Bending Part 17 O-ring 18 First seal lip 19 Second seal lip 20 Reinforcement ring 21 Backup ring 22 Backup ring 23 Fitting part 24 Fitting surface 25 Seal sleeve end 26 Jig 30 Spacer 31 Flange 32 Chamfering part 33 Lubricating oil Introduction hole

Claims (3)

  In the shaft seal device for sealing between the housing and the rotary shaft, a seal sleeve fitted to the outer peripheral surface of the rotary shaft, an inner peripheral lip portion is in sliding contact with the outer peripheral surface of the seal sleeve, and the outer peripheral portion is And a lip seal assembly that abuts against the peripheral wall of the rotation shaft through hole of the housing, and an O-ring housing portion bulging outward in the radial direction is formed on the sealed fluid side of the seal sleeve. Sealing device.   2. The shaft seal device according to claim 1, wherein the lip seal assembly is prevented from moving to the sealed fluid side through a cylindrical spacer disposed on the sealed fluid side. The introduction hole for introducing lubricating oil is formed in the cylindrical spacer in the vicinity of a position where the seal sleeve and the lip member of the lip seal assembly are in sliding contact with each other. Shaft seal device.

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