Rotary compressor having vane that has diamond-like carbon layer

• US 9,890,786 B2
• Filed: 01/29/2014
• Issued: 02/13/2018
• Est. Priority Date: 09/30/2013
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: Tanaka, Junya, Komine, Kenji
• Primary Examiner(s): Dounis, Laert
• Application Number:
  US14/898,042
• Publication Number:
  US 20160138593A1
• Time in Patent Office: 1,476 Days
• Field of Search: 418178
• CPC Class Codes: C23C 28/044 coatings specially adapted for cutting tools or wear applications
• CPC Class Codes: C23C 28/046 with at least one amorphous inorganic material layer, e.g. DLC, a-C:H, a-C:Me, the layer being doped or not
• CPC Class Codes: C23C 8/04 Treatment of selected surface areas, e.g. using masks
• CPC Class Codes: C23C 8/26 of ferrous surfaces
• CPC Class Codes: F01C 21/0809 Construction of vanes or vane holders
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 2230/91 Coating
• CPC Class Codes: F04C 2230/92 Surface treatment
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/12 Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
• CPC Class Codes: F05C 2201/0406 Chromium
• CPC Class Codes: F05C 2201/0409 Molybdenum
• CPC Class Codes: F05C 2201/0439 Cast iron
• CPC Class Codes: F05C 2201/0448 Steel
• CPC Class Codes: F05C 2201/046 Stainless steel or inox, e.g. 18-8
• CPC Class Codes: F05C 2201/0466 Nickel
• CPC Class Codes: F05C 2203/0808 Carbon, e.g. graphite
• CPC Class Codes: F05C 2203/083 Nitrides
• CPC Class Codes: F05C 2203/0882 Carbon, e.g. graphite
• CPC Class Codes: F05C 2253/12 : Coating

Abstract

A rotary compressor includes: a compressing unit that includes an annular cylinder, an end plate, an annular piston which is fit in an eccentric portion of a rotation shaft, and a vane which protrudes from the inside of a vane groove of the cylinder to the inside of an operation chamber, comes into contact with the annular piston, and partitions the operation chamber into an inlet chamber and a compression chamber. The vane is formed of steel and has a diamond-like carbon layer formed 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 is formed of cast iron or steel and has an iron nitride layer formed on an outer circumferential surface thereof.

Claims

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 only on an outer circumferential surface thereof, and a nitriding treatment is not performed on an inner 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 surf ace 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 only on an outer circumferential surface thereof, and a nitriding treatment is not performed on an inner 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 mixing a metal or chemical element thereto in addition to having a diamond bond and a graphite bond.