Rotary compressor

Patent metadata

Field	Value
Publication number	US-2016138593-A1
Application number	US-201414898042-A
Country	US
Kind code	A1
Filing date	Jan 29, 2014
Priority date	Sep 30, 2013
Publication date	May 19, 2016
Grant date	—

Abstract

A rotary compressor includes a compressing unit including: an annular cylinder; an end plate having a bearing unit, and closing an end portion of the cylinder; an annular piston fitted in a rotation shaft in the bearing unit, performing an orbital motion inside the cylinder, and forming an operation chamber with the cylinder inner wall; and a vane protruding from a groove of the cylinder to the operation chamber, coming into contact with the annular piston, and partitioning the operation chamber into an inlet chamber and a compression chamber. The vane is formed of steel and has a diamond-like carbon layer on a sliding surface with respect to the annular piston. The annular piston is formed of Ni—Cr—Mo cast iron to which 0.15 wt % to 0.45 wt % of phosphorus is added, or formed of cast iron or steel, and has an iron nitride layer on its outer circumferential surface.

First claim

1 . A rotary compressor comprising:
a vertically-positioned airtight compressor housing having an upper section in which a discharge portion of a refrigerant is provided and a lower section in which an inlet unit of the refrigerant is provided on a side surface thereof; a compressing unit that is disposed in the lower section of the compressor housing, that includes an annular cylinder, an end plate which has a bearing unit and a discharge valve unit and closes an end portion of the cylinder, an annular piston which is fit in an eccentric portion of a rotation shaft supported in the bearing unit, performs an orbital motion inside the cylinder along a cylinder inner wall of the cylinder, and forms an operation chamber together with the cylinder inner wall, and a vane which protrudes from the inside of a vane groove of the cylinder to the inside of the operation chamber, comes into contact with the annular piston, and partitions the operation chamber into an inlet chamber and a compression chamber, and that performs suction of the refrigerant via the inlet unit and discharges the refrigerant from the discharge portion via the inside of the compressor housing; and a motor that is disposed in the upper section of the compressor housing and drives the compressing unit via the rotation shaft, wherein the vane is formed of steel and has a diamond-like carbon layer formed on a sliding surface with respect to the annular piston, and wherein the annular piston is formed of Ni—Cr—Mo cast iron to which 0.15 wt % to 0.45 wt % of phosphorus is added, or is formed of cast iron or steel and has an iron nitride layer formed on an outer circumferential surface thereof.

2 . The rotary compressor according to claim 1 , wherein, between a base member and the diamond-like carbon layer of the vane, any one layer of a layer of which a ratio of SP3/SP2 is 5 or less, a CrN layer, and a nitride layer is formed as a joint layer.

3 . A rotary compressor comprising:
a vertically-positioned airtight compressor housing having an upper section in which a discharge portion of a refrigerant is provided and a lower section in which an inlet unit of the refrigerant is provided on a side surface thereof; a compressing unit that is disposed in the lower section of the compressor housing, that includes an annular cylinder, an end plate which has a bearing unit and a discharge valve unit and closes an end portion of the cylinder, an annular piston which is fit in an eccentric portion of a rotation shaft supported in the bearing unit, performs an orbital motion inside the cylinder along a cylinder inner wall of the cylinder, and forms an operation chamber together with the cylinder inner wall, and a vane which protrudes from the inside of a vane groove of the cylinder to the inside of the operation chamber, comes into contact with the annular piston, and partitions the operation chamber into an inlet chamber and a compression chamber, and that performs suction of the refrigerant via the inlet unit and discharges the refrigerant from the discharge portion via the inside of the compressor housing; and a motor that is disposed in the upper section of the compressor housing and drives the compressing unit via the rotation shaft, wherein the vane is formed of steel and has a diamond-like carbon layer having HmV of 1500 or higher which is formed as an under layer on a sliding surface with respect to the annular piston and a diamond-like carbon layer having HmV of 1200 or lower which is formed as a fitness layer on an outer side of the diamond-like carbon layer having HmV of 1500 or higher, and wherein the annular piston is formed of Ni—Cr—Mo cast iron or Ni—Cr—Mo cast iron to which 0.15 wt % to 0.45 wt % of phosphorus is added, or is formed of cast iron or steel and has an iron nitride layer formed on an outer circumferential surface thereof.

4 . The rotary compressor according to claim 3 , wherein, between a base member and the diamond-like carbon layer having HmV of 1500 or higher as the under layer of the vane, any one layer of a layer of which a ratio of SP3/SP2 is 5 or less, a CrN layer, and a nitride layer is formed as a joint layer.

5 . The rotary compressor according to claim 3 , wherein the diamond-like carbon layer having HmV of 1200 or lower as the fitness layer is formed by adding a metal or other elements thereto in addition to having a diamond bond and a graphite bond.

Assignees

• Fujitsu General Ltd

Inventors

• Tanaka Junya
• Komine Kenji

Classifications

• F05C2203/0808

  Carbon, e.g. graphite · CPC title

• F04C2230/91

  Coating · CPC title

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C23/001

  of similar working principle · CPC title

• F05C2201/0466

  Nickel · CPC title