# US 6,720,071 B2 · Tip seal and seal material for scroll type compressor

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- Number: US 6,720,071 B2
- Document ID: US6720071B2
- Status: Granted
- Kind: B2
- Application number: 10/078,987
- Filed: 2002-02-19
- Published: 2002-11-14
- Granted: 2004-04-13
- Earliest claimed: 2001-02-21
- Assignees: Ntn Corporation
- Inventors: Takuya Ishii
- Web page: https://patentgrep.com/patent/US6720071B2

## CPC

- F04C 27/005: {Axial sealings for working fluid}
- C08L 71/00: Compositions of polyethers obtained by reactions forming an ether link in the main chain (of polyacetals C08L59/00; of epoxy resins C08L63/00; of polythioether-ethers C08L81/02; of polyether-sulfones C08L81/06); Compositions of derivatives of such polymers
- C08G 2650/40: containing ketone groups, e.g. polyarylethylketones, PEEK or PEK
- C08L 27/18: Homopolymers or copolymers or tetrafluoroethene
- Y10T 428/24994: Fiber embedded in or on the surface of a polymeric matrix
- Y10T 428/249945: Carbon or carbonaceous fiber
- Y10T 428/2918: including free carbon or carbide or therewith [not as steel]
- Y10T 428/2933: Coated or with bond, impregnation or core
- Y10T 428/31609: Particulate metal or metal compound-containing
- Y10T 428/31761: Next to aldehyde or ketone condensation product
- Y10T 428/31946: Next to second aldehyde or ketone condensation product
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Disclosed is a tip seal and a seal material for a scroll type compressor with a discharge pressure of 8 MPa or more, comprising a resin composition that is molded into a spiral shape, and that contains an aromatic polyether ketone based resin containing at least 5 to 30% by weight of a carbon fiber and 1 to 30% by weight of a tetrafluoroethylene resin.

## Claims

### Claim 1

A spiral shaped tip seal for a scroll type compressor with a discharge pressure of a 8 MPa or more which uses a carbon dioxide gas as a refrigerant, said spiral shaped tip seal comprising a resin composition consisting essentially of,
an aromatic polyester ketene based resin,
a carbon fiber, and
a tetrafluoroethylene resin,
wherein the resin composition contains 5 to 30% by volume of the carbon fiber to 1 to 30% by volume of the tetrafluoroethylene resin based on the whole resin composition.

### Claim 2 (depends on 1)

A tip seal as claimed in claim 1, wherein the aromatic polyether ketone based resin is an aromatic polymer ketone resin.

### Claim 3 (depends on 1)

A tip seal as claimed in claim 1, wherein the aromatic polyether ketone based resin is an aromatic polymer ketone resin.

### Claim 4 (depends on 1)

A tip seal as claimed in claim 1, wherein the aromatic polyether ketone based resin is an aromatic polyether ether ketone resin.

### Claim 5 (depends on 1)

A tip seal as claimed in claim 1, wherein the tetrafluoroethylene resin is not fibrillated in a mixing step.

### Claim 6 (depends on 1)

A tip seal as claimed in claim 1, wherein the resin composition has melt viscosity of 50 to 300 Pas at a resin composition temperature of 380° C. and a sheer speed of 1000 s−1.

### Claim 7 (depends on 1)

A tip seal as claimed in claim 1, wherein the carbon fiber is a PAN based carbon fiber.

### Claim 8 (depends on 1)

A tip seal as claimed in claim 1, wherein the carbon fiber is a pitch based carbon fiber.

### Claim 9 (depends on 1)

A tip seal as claimed in claim 1, wherein at least one scroll of the scroll type compressor is formed with an aluminum alloy, and the seal material is slidably contacted with the aluminum alloy.

### Claim 10

A seal material of a resin composition for a scroll type compressor with a discharge pressure of 8 MPa or more which uses carbon dioxide gas as a refrigerant, said resin composition consisting essentially of,
an aromatic polyether ketone based resin,
a carbon fiber, and
a tetrafluoroethylene resin,
wherein the resin composition contains 5 to 30% by volume of the carbon fiber to 1 to 30% by volume of the tetrafluoroethylene resin based on the whole the resin composition.

### Claim 11

A seal material of a resin composition for use in a swash plate type, a rotary type a linear type, or a screw type compressor with a discharge pressure of 8 MPa or more using a carbon dioxide gas a as a refrigerant, said resin composition consisting essentially of,
an aromatic polyether ketone based resin,
a carbon fiber, and
a tetrafluoroethylene resin,
wherein the resin composition contains 5 to 30% by volume of the carbon fiber to 1 to 30% by volume of the tetrafluoroethylene resin based on the whole resin composition.