Compressor

Patent metadata

Field	Value
Publication number	US-12565880-B2
Application number	US-202017795073-A
Country	US
Kind code	B2
Filing date	Dec 1, 2020
Priority date	May 28, 2020
Publication date	Mar 3, 2026
Grant date	Mar 3, 2026

Abstract

Provided is a compressor including a sliding material with the wear resistance improved. To solve this problem, a compressor ( 40 ) includes: a compression chamber ( 43 ) that is formed in a cylinder ( 41 ) and compresses gas; and a piston ring 421 and a rider ring 422 that are in contact with the inner wall of the cylinder 41 to form the compression chamber ( 43 ). The piston ring 421 and rider ring 422 include: a resin member; and a metal particle that is located within the resin member and includes a surface layer containing an affinity portion having an affinity to the resin member.

First claim

The invention claimed is:

1 . A compressor, comprising:
a compression chamber that is formed in a metal housing and is configured to compress gas; and a sliding material that is in contact with an inner wall of the metal housing to form the compression chamber, wherein the sliding material includes:
a resin member; and
a metal particle that is located within the resin member and includes a surface layer containing an affinity portion having an affinity to the resin member, wherein
the affinity portion contains a functional group containing oxygen,
the surface layer is a coupling layer that couples organic substances and inorganic substances,
the resin member is fluorine-based resin,
the surface layer has a thickness of not less than 1/10000 and not greater than 1/100 of the particle size of the metal particle,
a particle diameter of the metal particle is between 10 to 250 μm, and
the metal particle is made of copper or copper alloy.

2 . The compressor according to claim 1 , wherein the affinity portion also contains a transition metal having an affinity to the resin member.

3 . The compressor according to claim 1 , wherein
the metal particle includes the surface layer and a core with the surface layer formed thereon, the metal layer of the surface layer is composed of a metal having a higher hardness than the inner wall of the metal housing, and the core is composed of a material having a lower hardness than the inner wall of the metal housing.

4 . The compressor according to claim 1 , wherein the metal particle is dendritic.

5 . The compressor according to claim 4 , wherein
the dendritic metal particle includes plural branches and a connecting section connecting the plural branches, and a metal layer as the surface layer increases in thickness toward tips of the plural branches.

6 . The compressor according to claim 1 , wherein the metal particle is spherical.

7 . The compressor according to claim 1 , wherein the sliding material includes a rod-shaped particle.

8 . The compressor according to claim 7 , wherein the rod-shaped particle is a carbon fiber or a glass fiber.

9 . The compressor according to claim 1 , wherein the compressor is an oil-free compressor.

10 . The compressor according to claim 1 , wherein the sliding material is one of a piston ring, a rider ring, a tip seal, and a slider.

11 . The compressor according to claim 1 , wherein the metal particle is dispersed at a proportion that is between 0.01 g of the metal particle and 10 g of the metal particle per 10 g of the resin member.

12 . A compressor, comprising:
a compression chamber that is formed in a metal housing and is configured to compress gas; and a sliding material that is in contact with an inner wall of the metal housing to form the compression chamber, wherein the sliding material includes:
a resin member; and
a metal particle that is located within the resin member and includes a core and a surface layer which is formed of the surface of the core and has a higher adhesion strength to the resin member than the core, wherein
the affinity portion contains a functional group containing oxygen,
the surface layer is a coupling layer that couples organic substances and inorganic substances,
the resin member is fluorine-based resin,
the surface layer has a thickness of not less than 1/10000 and not greater than 1/100 of the particle size of the metal particle,
a particle diameter of the metal particle is between 10 to 250 μm, and
the metal particle is made of copper or copper alloy.

13 . A compressor, comprising:
a compression chamber that is formed in a metal housing and is configured to compress gas; and a sliding material that is in contact with an inner wall of the metal housing to form the compression chamber, wherein the sliding material includes:
a resin member; and
a metal particle that is located within the resin member and includes a surface layer formed by a conversion coating process to enhance the affinity to the resin member, wherein
the affinity portion contains a functional group containing oxygen,
the surface layer is a coupling layer that couples organic substances and inorganic substances,
the resin member is fluorine-based resin,
the surface layer has a thickness of not less than 1/10000 and not greater than 1/100 of the particle size of the metal particle,
a particle diameter of the metal particle is between 10 to 250 μm, and
the metal particle is made of copper or copper alloy.

Assignees

• Hitachi Industry Equipment Systems Co Ltd

Inventors

• ONODERA Tasuku
• Kobayashi Yoshio

Classifications

• F16J9/26

  characterised by the use of particular materials · CPC title

• F04B39/12

  Casings; Cylinders; Cylinder heads; Fluid connections · CPC title

• C08K2003/085

  Copper · CPC title

• C08K2003/2237

  of titanium · CPC title

• C08K3/04

  Carbon · CPC title