JP2006170349A - Gasket - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular gasket with a metal base plate and a rubber coating covering both faces of the base plate, for suppressing the permeating leakage of refrigerant gas from the outer peripheral face. <P>SOLUTION: The annular gasket comprises the metal base plate and the rubber coating covering both faces of the base plate. The ratio (the thickness of the rubber coating/the thickness of the base plate) of the thickness of the rubber coating to the thickness of the base plate is set smaller on at least part of the outer peripheral face than on the other portion of the gasket. The sum of the thickness of the base plate and the thickness of the rubber coating are kept constant over the whole gasket. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to a gasket for a compressor that sucks and compresses refrigerant gas.

An annular gasket comprising a metal substrate and a rubber coating covering both sides of the substrate, the sum of the substrate thickness and the rubber coating thickness is constant over the entire gasket, and the bottom surface of the lid member and the cylindrical shape FIGS. 9 and 10 of Patent Document 1 disclose a gasket that is bolted and seals a fastening portion of both members in a state in which the upper surface of the members is substantially entirely abutted.
JP 2002-005291 A

Since rubber is a refrigerant gas permeable material, when the gasket of Patent Document 1 is used for a housing connecting portion of a refrigerant gas compressor, the refrigerant gas permeates the rubber coating and leaks out of the housing from the outer peripheral surface of the gasket. .
The present invention has been made in view of the above problems, and is an annular gasket including a metal substrate and a rubber coating covering both surfaces of the substrate, and the permeation leakage of the refrigerant gas from the outer peripheral surface is suppressed. An object is to provide a gasket.

In order to solve the above problems, in the present invention, an annular gasket comprising a metal substrate and a rubber coating covering both surfaces of the substrate, the ratio of the rubber film thickness to the substrate thickness (rubber film thickness / The thickness of the substrate is set to be smaller than that of the other portion of the gasket in at least a part of the outer peripheral surface, and the sum of the substrate thickness and the rubber coating thickness is constant over the entire gasket. Provide gaskets.
In the gasket according to the present invention, the ratio of the rubber film thickness to the substrate thickness (rubber film thickness / substrate thickness) is set to be smaller than the other part of the gasket in at least a part of the outer peripheral surface, and the substrate thickness And the rubber film thickness is constant over the entire gasket, so the area of the outer peripheral surface of the rubber coating that forms the refrigerant gas leakage surface is compared to the conventional gasket where the ratio is constant over the entire substrate. Small. As a result, permeation leakage of the refrigerant gas from the gasket outer peripheral surface is suppressed.

In a preferred embodiment of the present invention, the sum of the substrate thickness and the rubber coating thickness is the same as that of a conventional gasket.
If the sum of the substrate thickness and the rubber film thickness, that is, the thickness of the gasket is the same as that of the conventional gasket, the conventional gasket used in the refrigerant gas compressor can be immediately replaced with the gasket according to the present invention. it can.

In the present invention, an annular gasket having a metal substrate and a rubber coating covering both surfaces of the substrate, the ratio of the rubber film thickness to the substrate thickness (rubber film thickness / substrate thickness) is A refrigerant gas compressor provided with a gasket, characterized in that it is set to be at least partially smaller than the other part of the gasket, and the sum of the substrate thickness and the rubber coating thickness is constant over the entire gasket. provide.
In the refrigerant gas compressor according to the present invention, the permeation leakage of the refrigerant gas through the rubber coating of the gasket is suppressed as compared with the conventional one.

In the gasket according to the present invention, the ratio of the rubber film thickness to the substrate thickness (rubber film thickness / substrate thickness) is set to be smaller than the other part of the gasket in at least a part of the outer peripheral surface, and the substrate thickness And the rubber film thickness is constant over the entire gasket, so the area of the outer peripheral surface of the rubber coating that forms the refrigerant gas leakage surface is larger than that of the conventional gasket where the ratio is constant over the entire substrate. Small. As a result, permeation leakage of the refrigerant gas from the gasket outer peripheral surface is suppressed.

A gasket according to an embodiment of the present invention and a refrigerant gas compressor using the gasket will be described.

As shown in FIG. 1, the variable capacity swash plate compressor A includes a rotating shaft 10, a rotor 11 fixed to the rotating shaft 10, and a swash plate 12 supported on the rotating shaft 10 so that the tilt angle is variable. Yes. 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 plurality of pairs of shoes 14, a plurality of pistons 15, and bores 16a are disposed at intervals in the circumferential direction.
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.

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 21a and a discharge chamber 21b is disposed.
A valve plate 22 having a suction port 22a and a discharge port 22b communicating with the bore 16a is disposed between the cylinder block 16 and the cylinder head 21. An intake valve and a discharge valve are mounted on the valve plate 22.

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 between the front housing 18 and the cylinder block 16, and a joint 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.
As shown in FIG. 2, the gasket 24 is an annular body including a metal substrate 24a and a rubber coating 24b that covers both surfaces of the substrate 24a. A ratio of the thickness of the rubber coating 24b to the thickness of the substrate 24a (rubber coating thickness / substrate thickness) is achieved by increasing the thickness of a part or all of the outer periphery of the substrate 24a in a taper shape outward in the radial direction. However, a part or all of the outer peripheral surface is set to be smaller than the other part of the gasket 24, and the sum of the thickness of the substrate 24a and the film thickness of the rubber coating 24b, that is, the thickness of the gasket 24 is It is set constant throughout. The thickness of the gasket 24, which is the sum of the thickness of the substrate 24a and the thickness of the rubber coating 24b, is set to the same value as that of the conventional gasket. The film thickness of the rubber coating 24b in the portion excluding the outer peripheral portion is set to the same value as the film thickness of the rubber coating in the conventional gasket. The
The gaskets 25 and 26 are configured similarly to the gasket 24.

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 gas recirculated from the external refrigeration circuit is sucked into the bore 16a through the suction port formed in the cylinder head 21, the suction chamber 21a, the suction port 22a, and the suction valve, compressed in the bore 16a, and discharged from the discharge port 22b. And the discharge valve, the discharge chamber 21b, and the discharge port formed in the cylinder head 21 to the external refrigeration circuit.
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 gasket 24, the ratio of the thickness of the rubber coating 24b to the thickness of the substrate 24a (rubber coating thickness / substrate thickness) is set to be smaller than that of the other portion of the gasket 24 in at least a part of the outer peripheral surface. In addition, since the sum of the thickness of the substrate 24a and the thickness of the rubber coating 24b is constant over the entire gasket 24, the area of the outer peripheral surface of the rubber coating 24b forming the refrigerant gas leakage surface is the same as the ratio of the entire gasket. It is small compared to the conventional gasket that was almost constant. As a result, permeation leakage of the refrigerant gas from the outer peripheral surface of the gasket 24 is suppressed.
Since the sum of the thickness of the substrate 24a and the thickness of the rubber coating 24b, that is, the thickness of the gasket 24 is the same as that of the conventional gasket, the conventional gasket used in the refrigerant gas compressor is immediately replaced with the gasket 24. Can do.
Also in the gaskets 25 and 26, similarly to the gasket 24, the permeation leakage of the refrigerant gas from the outer peripheral surface is suppressed, and the conventional gasket used in the refrigerant gas compressor is immediately replaced with the gaskets 25 and 26. can do.
In the variable capacity swash plate type compressor A provided with the gaskets 24 to 26, permeation leakage of the refrigerant gas through the rubber coating of the gaskets 24 to 26 is suppressed as compared with the conventional case.

Instead of thickening a part or all of the outer peripheral portion of the substrate 24a in a taper shape outward in the radial direction, as shown in FIG. 3, part or all of the outer peripheral portion of the substrate is radially outward. It may be thickened in a staircase shape.

The gasket according to the present invention can be widely used not only for swash plate compressors but also for various refrigerant gas compressors.

1 is a cross-sectional view of a variable capacity swash plate compressor including a gasket according to an embodiment of the present invention. It is sectional drawing of the gasket which concerns on the Example of this invention. It is sectional drawing of the gasket which concerns on the other Example of this invention.

Explanation of symbols

A Variable capacity 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 24, 25, 26 Gasket 24a Substrate 24b Rubber coating

Claims (3)

An annular gasket comprising a metal substrate and a rubber coating covering both surfaces of the substrate, wherein the ratio of the rubber film thickness to the substrate thickness (rubber film thickness / substrate thickness) is at least a part of the outer peripheral surface. The gasket is characterized in that it is set smaller than the other part, and the sum of the substrate thickness and the rubber coating thickness is constant throughout the gasket. The gasket according to claim 1, wherein the sum of the substrate thickness and the rubber coating thickness is the same as that of a conventional gasket. A refrigerant gas compressor comprising the gasket according to claim 1.

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