JP2008115735A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor capable of surely preventing coolant from leaking by improving the oil resistance of a dynamic seal to improve the sealing performance of the compressor. <P>SOLUTION: The compressor is provided with the dynamic seal 19 having a resin layer 23 with superior oil resistance on the surface, in which a rubbery elastic body with a low coolant permeable property is employed as a base material 22. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement in the sealing performance of a motion seal of a compressor suitable for a refrigeration cycle such as a vehicle air conditioner, a room air conditioner, a showcase, and a vending machine. The present invention relates to a compressor suitable for a machine.

A refrigerant containing HFC-134a (CF ₃ CFH ₂ ) is frequently used as a refrigerant in a refrigeration cycle such as an air conditioner for automobiles. However, in recent years, from the viewpoint of protecting the global environment, prevention of leakage of refrigerant from a refrigeration cycle such as an automotive air conditioner has been demanded.

  Leakage of refrigerant from the refrigeration cycle is prevented by a sealing material used in the circuit. For example, as an HFC-134a refrigerant, a seal member formed from ethylene-propylene-nonconjugated diene terpolymer rubber (hereinafter simply referred to as EPDM) has been proposed (for example, Patent Document 1).

  However, when used in a compressor of a refrigeration cycle of a vehicle air conditioner, for example, an automotive air conditioner, it has a high possibility of coming into contact with mineral oil (for example, gasoline, engine oil, etc.), thus improving mineral oil resistance. There is a need. Furthermore, it is necessary to improve the resistance to refrigerating machine oil for refrigerating machine oil (for example, polyalkylene glycol (PAG), polyol ester (POE)).

JP 2005-139949 A

  Then, the subject of this invention aims at providing the compressor which improves the sealing performance of a compressor by improving the oil resistance of the exercise | movement seal | sticker, and can prevent a refrigerant | coolant leak reliably.

  In order to solve the above-described problems, the compressor according to the present invention has a motion seal in which a rubber-like elastic body having low refrigerant permeability is used as a base material and a resin layer having excellent oil resistance is provided on the surface thereof. Consists of features. In such a configuration, the surface of the base material made of a rubber-like elastic body having low refrigerant permeability is provided with a resin layer having a small compatibility with mineral oil and refrigerating machine oil and having excellent oil resistance. Since dissolution is reliably prevented, leakage of the refrigerant from the compressor is reliably prevented over a long period of time.

  Examples of the motion seal include a lip seal of a shaft seal portion of a compressor.

  The rubber-like elastic body having low refrigerant permeability is not particularly limited, but is a substance having low compatibility with the refrigerant. Examples thereof include EPDM, butyl rubber, and butyl chloride rubber.

  The resin layer excellent in oil resistance is not particularly limited, but is a substance having low compatibility with mineral oil and refrigerating machine oil. Examples thereof include aliphatic polyamides (for example, nylon 6, nylon 610), polyolefins, and polymer alloys of aliphatic polyamides and polyolefins.

The compatibility of substances depends on the difference in solubility parameter (hereinafter simply referred to as SP value). That is, the greater the SP value difference, the smaller the compatibility, and the smaller the SP value difference, the greater the compatibility.
Below, SP value of each substance is shown.

  The refrigerant to be compressed to be compressed by the compressor is not particularly limited, but is frequently used in refrigeration cycles of various devices, and has a large global warming potential (hereinafter simply referred to as GWP). The HFC-134a which has a great demand for preventing leakage from the cycle can be mentioned.

  According to the compressor according to the present invention, since a rubber-like elastic body having a low refrigerant permeability is used as a base material and an exercise seal provided with a resin layer having excellent oil resistance on the surface thereof is used, Swelling and dissolution can be reliably prevented, and refrigerant leakage from the compressor can be reliably prevented over a long period of time.

  If the motion seal is composed of a lip seal, it can be applied to a shaft seal portion of a compressor, for example.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a compressor according to an embodiment of the present invention. The compressor which concerns on this embodiment is a compressor used for the refrigerating circuit of a motor vehicle air conditioner, Comprising: HFC-134a is used as a to-be-compressed refrigerant | coolant.

  The compressor 1 in this embodiment is configured as a variable displacement swash plate compressor. The compressor 1 includes a drive shaft 2, a rotor 3 fixed to the drive shaft 2, and a swash plate 4 fixed to the drive shaft 2 so that the inclination angle can be varied. The swash plate 4 is connected to the rotor 3 via a link mechanism 5. A piston 7 is connected to the outer periphery of the swash plate 4 via a pair of shoes 6. The piston 7 is formed in the cylinder block 8 and is movably inserted into the cylinder bore 9.

  The drive shaft 2 extends through the front housing 11 that forms the crank chamber 10 in which the rotor 3 and the swash plate 4 are accommodated. A lip seal 19 is provided at the penetrating portion of the front housing 11 of the drive shaft 2 as an exercise seal for sealing the penetrating portion.

  A cylinder head 12 is connected to the cylinder block 8, and a suction chamber 13 and a discharge chamber 14 are formed in the cylinder head 12. The refrigerant sucked into the suction chamber 13 from the suction port 15 (in this embodiment, HFC-134a) flows into the cylinder bore 9 through the suction hole 16 and is compressed in the cylinder bore 9 as the piston 7 moves. Thus, the refrigerant to be compressed is discharged from the discharge hole 17 into the discharge chamber 13. Reference numeral 18 denotes an electromagnetic clutch that transmits and shuts off power from an external drive source (for example, an engine or a motor as an automobile prime mover) to the drive shaft 2.

  The lip seal 19 is configured as shown in FIG. 2. The right side in FIG. 2 shows the crank chamber side of the compressor 1, and the left side in FIG. 2 shows the outside. The lip seal 19 is provided with a rubber lip 21 on one side (crank chamber side) of a support ring 20 made of a metal ring and a resin lip 24 (for example, a lip made of a fluorine-based resin) on the other side (external side of the compressor). ing.

  The rubber lip 21 is formed of a base material 22 made of a rubber-like elastic body having low refrigerant permeability and a resin layer 23 covering the surface of the base material 22. Examples of the rubber-like elastic body having a low refrigerant permeability forming the substrate 22 include EPDM, butyl rubber, and butyl chloride rubber. Moreover, as resin which forms the resin layer 23 excellent in oil resistance provided on the surface of the base material 22, for example, aliphatic polyamide (for example, nylon 6, nylon 610, etc.), polyolefin, and aliphatic polyamide and polyolefin There may be mentioned polymer alloys.

  In the present embodiment, the rubber lip 21 is formed of a rubber-like elastic body having low refrigerant permeability as a base material 222 and a resin 23 layer having excellent oil resistance formed on the surface thereof. That is, compatibility with mineral oil (for example, gasoline, engine oil, etc.) and refrigerating machine oil (for example, PAG, POE) on the surface of the base material 22 made of a rubber-like elastic body with low permeability of HFC-134a as a refrigerant. Since the resin layer 23 having small and excellent oil resistance is provided, swelling and dissolution of the base material 23 are surely prevented. Therefore, leakage of HFC-134a from the compressor 1 can be reliably prevented over a long period of time.

  The present invention is suitable for a compressor of a refrigeration cycle such as a vehicle air conditioner, a room air conditioner, a showcase, and a vending machine, particularly a compressor of a refrigeration cycle using HFC-134a as a refrigerant.

It is a longitudinal section of the compressor concerning one embodiment of the present invention. It is a partial expanded longitudinal cross-sectional view of the lip seal which comprises the shaft seal part of the compressor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Drive shaft 3 Rotor 4 Swash plate 5 Link mechanism 6 A pair of shoes 7 Piston 8 Cylinder block 9 Cylinder bore 10 Crank chamber 11 Front housing 12 Cylinder head 13 Suction chamber 14 Discharge chamber 15 Suction port 16 Suction hole 17 Discharge hole 18 Electromagnetic clutch 19 Lip seal as exercise seal 20 Support ring 21 Rubber lip 22 Base material made of rubber-like elastic material with low refrigerant permeability 23 Resin layer excellent in oil resistance 24 Resin lip

Claims (5)

  A compressor having a motion seal in which a rubber-like elastic body having low refrigerant permeability is used as a base material and a resin layer having excellent oil resistance is provided on the surface thereof.   The compressor of claim 1, wherein the motion seal comprises a lip seal.   The compressor according to claim 1 or 2, wherein the rubber-like elastic body having low refrigerant permeability is made of ethylene-propylene-nonconjugated diene terpolymer rubber, butyl rubber, or chlorinated butyl rubber.   The compressor according to any one of claims 1 to 3, wherein the resin layer having excellent oil resistance is made of aliphatic polyamide, or polyolefin, or a polymer alloy of aliphatic polyamide and polyolefin. The compressor according to any one of claims 1 to 4, wherein the refrigerant to be compressed to be compressed by the compressor is made of a refrigerant containing HFC-134a.

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