JP2006242217A - Refrigerant gas compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerant gas compressor comprising a rotating shaft, a compression mechanism to be driven by the rotating shaft, a housing storing the rotating shaft and the compression mechanism, and a shaft sealing device whose inner periphery portion is in slide contact with the outer peripheral face of the rotating shaft and whose outer periphery portion has a lip seal member abutting on the peripheral wall of a rotating shaft passing-through hole of the housing for sealing a housing passing-through portion of the rotating shaft, the lip seal member of the shaft sealing device having all of improved wear resistance, heat resistance and refrigerant anti-permeability. <P>SOLUTION: The refrigerating gas compressor comprises the rotating shaft, the compression mechanism to be driven by the rotating shaft, the housing storing the rotating shaft and the compression mechanism, and the shaft sealing device whose inner periphery portion is in slide contact with the outer peripheral face of the rotating shaft and whose outer periphery portion has a lip seal member abutting on the peripheral wall of a rotating shaft passing-through hole of the housing, for sealing a housing passing-through portion of the rotating shaft. The lip seal member of the shaft sealing device consists of an inside layer having improved wear resistance and heat resistance, and an outside layer having improved refrigerant anti-permeability. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a refrigerant gas compressor.

A rotation shaft, a compression mechanism driven by the rotation shaft, a housing that houses the rotation shaft and the compression mechanism, an inner peripheral portion that is in sliding contact with the outer peripheral surface of the rotation shaft, and an outer peripheral portion that is in contact with the peripheral wall of the rotation shaft through hole of the housing. A refrigerant gas compressor including a cylindrical lip seal member that is in contact with a shaft seal device that seals a housing penetration portion of a rotating shaft is disclosed in Patent Document 1 and the like.
JP 2003-246976 A

The inner peripheral portion of the lip seal member that is in sliding contact with the outer peripheral surface of the rotating shaft is required to have excellent wear resistance and excellent heat resistance, and the outer peripheral portion of the lip seal member that contacts the peripheral wall of the rotating shaft through hole of the housing is required. Is required to have excellent refrigerant permeation resistance.
In the conventional refrigerant gas compressor, since the lip seal member of the shaft seal device is formed of a homogeneous material, it is possible to simultaneously provide excellent wear resistance, excellent heat resistance, and excellent refrigerant permeation resistance. It was difficult.
The present invention has been made in view of the above problems, and includes a rotating shaft, a compression mechanism driven by the rotating shaft, a housing that accommodates the rotating shaft and the compression mechanism, and an inner peripheral portion on the outer peripheral surface of the rotating shaft. A refrigerant gas compressor comprising a shaft seal device that has a cylindrical lip seal member that is in sliding contact and has an outer peripheral portion that abuts against a peripheral wall of a rotary shaft through hole of a housing, and that seals the housing through portion of the rotary shaft. An object of the present invention is to provide a compressor in which the lip seal member is excellent in all of wear resistance, heat resistance, and refrigerant permeation resistance.

In order to solve the above problems, in the present invention, a rotating shaft, a compression mechanism driven by the rotating shaft, a housing that houses the rotating shaft and the compression mechanism, and an inner peripheral portion slide on the outer peripheral surface of the rotating shaft. A shaft seal device that has a cylindrical lip seal member that contacts and is in contact with the peripheral wall of the rotation shaft through hole of the housing, and seals the housing penetration portion of the rotation shaft, and the lip seal member of the shaft seal device is wear resistant Provided is a refrigerant gas compressor characterized by having an inner layer excellent in heat resistance and heat resistance and an outer layer excellent in refrigerant permeation resistance.
In the refrigerant gas compressor according to the present invention, the inner peripheral portion of the lip seal member that is required to have wear resistance and heat resistance is formed by an inner layer that is excellent in wear resistance and heat resistance, and the refrigerant permeability resistance is high. Since the required outer peripheral portion is formed by an outer layer having excellent refrigerant permeation resistance, the lip seal member of the shaft seal device provided in the compressor according to the present invention is excellent in all of wear resistance, heat resistance, and refrigerant permeation resistance. .

In a preferred embodiment of the present invention, the lip seal member is made of a material mainly composed of hydrogenated nitrile rubber.
Hydrogenated nitrile rubber is an abrasion and heat resistant material. By changing the compounding of the additive between the inner layer and the outer layer, it is possible to impart excellent wear resistance and heat resistance to the inner layer and to impart excellent refrigerant permeation resistance to the outer layer.

In the present invention, a shaft seal device for a refrigerant gas compressor comprising a cylindrical lip seal member having an inner layer excellent in wear resistance and heat resistance and an outer layer excellent in refrigerant permeation resistance I will provide a.
By using the shaft seal device according to the present invention for the refrigerant gas compressor, leakage of the refrigerant from the rotating shaft penetrating portion of the compressor housing can be prevented over a long period of time.

In the compressor according to the present invention, the inner peripheral portion of the lip seal member that is required to have wear resistance and heat resistance is formed by an inner layer that is excellent in wear resistance and heat resistance, and refrigerant permeation resistance is required. Since the outer peripheral portion is formed of the outer layer having excellent refrigerant permeation resistance, the lip seal member of the shaft seal device provided in the refrigerant gas compressor according to the present invention is excellent in all of wear resistance, heat resistance, and refrigerant permeation resistance. .

A swash plate type refrigerant gas compressor according to an embodiment of the present invention will be described.

As shown in FIG. 1, a variable capacity swash plate compressor A for sucking and compressing refrigerant gas includes a rotating shaft 10, a rotor 11 fixed to the rotating shaft 10, and a tilting shaft supported by the rotating shaft 10 with a variable tilt angle. And a plate 12. The swash plate 12 is connected to the rotor 11 via a link mechanism 13 that allows the tilt angle of the swash plate 12 to vary, and rotates in synchronization with the rotor 11 and thus the rotating shaft 10.
A piston 15 is moored to the swash plate 12 via a pair of shoes 14 that are in sliding contact with the peripheral edge of the swash plate 12.
The piston 15 is inserted into a bore 16 a formed in the cylinder block 16.
A bottomed cylindrical front housing 18 that forms a crank chamber 17 that houses the rotating shaft 10, the rotor 11, and the swash plate 12 is disposed. The rotating shaft 10 extends through the front housing 18 to the outside.

A shaft sealing member 19 that seals the front housing penetrating portion of the rotary shaft 10 is disposed. As shown in FIG. 2, the shaft seal member 19 includes lip seal members 19a and 19b and holding metal fittings 19c and 19d for holding and fixing the lip seal members 19a and 19b.
The lip seal member 19a disposed near the crank chamber 17 is made of hydrogenated nitrile rubber (HNBR), which is a cylindrical, wear-resistant, heat-resistant material having a parallel part and a disc spring-shaped part. This is a rubber molded body. One end of the inner peripheral portion of the disc spring-shaped portion is in sliding contact with the outer peripheral surface of the rotating shaft 10. The outer peripheral portion of the parallel portion is in contact with the peripheral wall of the rotation shaft through hole of the front housing 18. The other end of the disc spring-shaped portion of the lip seal member 19a is held by holding metal fittings 19c and 19d, and the parallel portion of the lip seal member 19a is held by the holding metal fitting 19c and the front housing 18.
The lip seal member 19 a includes an inner layer 19 a ′ including one end of the inner peripheral portion of the disc spring-shaped portion that is in sliding contact with the outer peripheral portion of the rotating shaft 10, and an outer periphery of a parallel portion that contacts the peripheral wall of the rotating shaft through hole of the front housing 18. It has a two-layer structure of the outer layer 19a ″ including the portion. It is required to have excellent wear resistance and heat resistance including one end of the inner peripheral portion of the disc spring-shaped portion that is in sliding contact with the outer peripheral portion of the rotating shaft 10. Additives for strengthening the wear resistance and heat resistance material are mixed in the hydrogenated nitrile rubber of the inner layer 19a'.The outer peripheral portion of the parallel portion contacting the peripheral wall of the rotation shaft through hole of the front housing 18 is provided. The hydrogenated nitrile rubber of the outer layer 19a ″ that is required to have excellent refrigerant permeation resistance is mixed with an additive that imparts refrigerant permeation resistance. The inner layer 19a ′ and the outer layer 19a ″ are bonded and integrated with each other.
The lip seal member 19b disposed near the end of the rotating shaft 10 is a resin molded body made of polytetrafluoroethylene (PTFE) or the like having a disc spring shape. One end of the lip seal member 19b is in sliding contact with the peripheral side surface of the rotary shaft 10, and the other end is held by holding metal fittings 19c and 19d.
The disc spring-shaped portion of the lip seal member 19a and the lip seal member 19b extend radially inward as shown by a two-dot chain line in FIG. 2 before being assembled to the front housing through portion of the rotary shaft 10. However, after assembling, it is pressed against the peripheral side surface of the rotating shaft 10 and slidably contacts with the peripheral side surface to seal the front housing penetrating portion of the rotating shaft 10.
The outer peripheral portion of the parallel portion of the lip seal member 19a is in contact with the peripheral wall of the rotary shaft through hole of the front housing 18 to seal the front housing through portion of the rotary shaft 10.

Rotational power is transmitted from an external drive source (not shown) to the tip of the rotary shaft 10 via an electromagnetic clutch 20 attached to the front housing 18.
A cylinder head 21 that forms a suction chamber and a discharge chamber is disposed.
A valve plate 22 having a suction hole and a discharge hole communicating with the bore 16 a is disposed between the cylinder block 16 and the cylinder head 21.

The front housing 18, the cylinder block 16, the valve plate 22, and the cylinder head 21 are assembled together by bolts 23. A gasket 24 is inserted in a joint portion between the front housing 18 and the cylinder block 16, and a joint portion between the cylinder block 16 and the cylinder head 21, more specifically, a joint between the valve plate 22, the cylinder block 16, and the cylinder head 21. Gaskets 25 and 26 are inserted in the part to seal the part. The rotary shaft 10 is rotatably supported by a front housing 18 and a cylinder block 16.

In the variable capacity swash plate compressor A, the rotational power of an external drive source (not shown) is transmitted to the rotary shaft 10 via the electromagnetic clutch 20, and the rotation of the rotary shaft 10 is transmitted to the swash plate via the rotor 11 and the link mechanism 13. 12 is transmitted. The reciprocating motion in the extending direction of the rotating shaft 10 at the peripheral edge of the swash plate 12 accompanying the rotation of the swash plate 12 is transmitted to the piston 15 via the shoe 14, and the piston 15 reciprocates in the bore 16a. The refrigerant recirculated from the external refrigeration circuit is sucked into the bore 16a through a suction port, a suction chamber, a suction hole, and a suction valve (not shown) formed in the cylinder head 21, and is compressed in the bore 16a. To the external refrigeration circuit through the discharge valve, the discharge chamber, and the discharge port formed in the cylinder head 21.
Leakage of refrigerant gas from the variable capacity swash plate compressor A is prevented by the shaft seal device 19 and the gaskets 24 to 26.

In the variable capacity swash plate compressor A, the inner peripheral portion of the lip seal member 19a, which is required to have wear resistance and heat resistance, is formed by an inner layer 19a 'which is excellent in wear resistance and heat resistance. Since the outer peripheral portion where permeability is required is formed by the outer layer 19a ″ having excellent refrigerant permeation resistance, the lip seal member 19a of the shaft seal device provided in the variable capacity swash plate compressor A has wear resistance, heat resistance, Excellent refrigerant permeation resistance.
Hydrogenated nitrile rubber is an abrasion and heat resistant material. By changing the blending of the additive between the inner layer 19a ′ and the outer layer 19a ″, the inner layer 19a ′ has excellent wear resistance and heat resistance, and the outer layer 19a ″ has excellent refrigerant permeation resistance. Can be granted.
By using the shaft seal device 19 in the refrigerant gas compressor, leakage of the refrigerant gas from the rotating shaft penetrating portion of the compressor housing can be prevented over a long period of time.
An intermediate layer may be sandwiched between the inner layer 19a ′ and the outer layer 19a ″.

The present invention is widely applicable not only to swash plate compressors but also to all types of compressors that suck and compress refrigerant gas.

1 is a cross-sectional view of a variable capacity swash plate compressor according to an embodiment of the present invention. 1 is a partial cross-sectional view of a variable capacity swash plate compressor according to an embodiment of the present invention.

Explanation of symbols

A Variable displacement swash plate compressor 10 Rotating shaft 11 Rotor 12 Swash plate 13 Link mechanism 14 Shoe 15 Piston 18 Front housing 19 Shaft seal members 19a and 19b Lip seal member 19a 'Inner layer 19a "Outer layer

Claims (4)

A rotary shaft, a compression mechanism driven by the rotary shaft, a housing that houses the rotary shaft and the compression mechanism, an inner peripheral portion that is in sliding contact with the outer peripheral surface of the rotary shaft, and an outer peripheral portion that is in contact with the peripheral wall of the rotary shaft through hole of the housing. A shaft seal device that has a cylindrical lip seal member in contact therewith and seals the housing penetration of the rotating shaft. The lip seal member of the shaft seal device has an inner layer that is excellent in wear resistance and heat resistance, and a refrigerant permeation resistance. A refrigerant gas compressor characterized by having an outer layer having excellent properties. The refrigerant gas compressor according to claim 1, wherein the lip seal member is made of a material mainly composed of hydrogenated nitrile rubber. A shaft seal device for a refrigerant gas compressor, comprising a cylindrical lip seal member having an inner layer excellent in wear resistance and heat resistance and an outer layer excellent in refrigerant permeation resistance. 4. The shaft seal device for a refrigerant gas compressor according to claim 3, wherein the lip seal member is made of a material mainly composed of hydrogenated nitrile rubber.

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