Slide member, refrigerant compressor incorporating slide member, refrigerator and air conditioner

Patent metadata

Field	Value
Publication number	US-2016017874-A1
Application number	US-201314379838-A
Country	US
Kind code	A1
Filing date	Feb 15, 2013
Priority date	Feb 20, 2012
Publication date	Jan 21, 2016
Grant date	—

Abstract

A slide member of the present invention is used in a slide unit which is included in a refrigerant compressor for compressing a refrigerant and provided inside a sealed container which reserves lubricating oil therein. The slide member is provided with an oxide coating film on a surface of a base material. The oxide coating film is configured such that (1) when the base material comprises an iron based material, the oxide coating film has a three-layer structure including a first layer comprising Fe 2 O 3 , a second layer comprising Fe 3 O 4 , and a third layer comprising FeO in this order from an outermost surface, (2) the oxide coating film has a dense structure having minute concave/convex portions with a height difference which falls within a range of 0.01 μm to 0.1 μm, or (3) when the base material comprises the iron based material, the oxide coating film has a three-layer structure in which the three layers comprise the iron oxides and are different in hardness.

First claim

1 . A slide member which is used in a slide unit which is included in a refrigerant compressor for compressing a refrigerant and provided inside a sealed container which reserves lubricating oil therein,
the slide member comprising a base material comprising an iron based material, and an oxide coating film formed on a surface of the base material, the oxide coating film having a three-layer structure including a first layer comprising Fe2O3, a second layer comprising Fe3O4, and a third layer comprising FeO in this order from an outermost surface.

2 . The slide member according to claim 1 ,
wherein when a thickness of the first layer is T 1 , a thickness of the second layer is T 2 , and a thickness of the third layer is T 3 , T 1 :T 2 :T 3 =5 to 20:10 to 50:30 to 85 is satisfied.

3 . The slide member according to claim 1 ,
wherein the third layer comprises FeO having an amorphous structure.

4 . The slide member according to claim 1 ,
wherein the oxide coating film including the first layer, the second layer and the third layer has a thickness in a range of 1 μm to 3 μm.

5 . The slide member according to claim 1 ,
wherein at least the first layer has a structure in which iron oxide particles are gathered together in a layer form; and wherein the iron oxide particles have a particle diameter in a range of 0.1 μm to 4.0 μm.

6 . A slide member which is used in a slide unit which is included in a refrigerant compressor for compressing a refrigerant and provided inside a sealed container which reserves lubricating oil therein,
the slide member comprising on a surface of a base material, a dense oxide coating film having minute concave/convex portions with a height deference in a range of 0.01 μm to 0.1 μm.

7 . The slide member according to claim 6 ,
wherein the oxide coating film has a structure in which oxide particles are gathered together and laid on the surface of the base material; and wherein the oxide particles are densely gathered together such that a spacing between tops of adjacent oxide particles is equal to or less than 4 μm.

8 . A slide member which is used in a slide unit which is included in a refrigerant compressor for compressing a refrigerant and provided inside a sealed container which reserves lubricating oil therein,
the slide member comprising a base material comprising an iron based material, and an oxide coating film formed on a surface of the base material, the oxide coating film having a three-layer structure including at least three layers which comprise iron oxides and are different in hardness.

9 . The slide member according to claim 8 ,
wherein a first layer which is an outermost surface of the three-layer structure has a hardness which is equal to or lower than a hardness of a second layer as an intermediate layer of the three-layer structure; and wherein a third layer located on the base material has a hardness which is higher than a hardness of the base material and lower than the hardness of the second layer.

10 . The slide member according to claim 9 ,
wherein the first layer is configured such that the outermost surface has a hardness in a range of 200 Hv to 300 Hv, and a region in the vicinity of a boundary between the first layer and the second layer has a hardness in a range of 500 Hv to 600 Hv; wherein the hardness of the second layer is in a range of 500 Hv to 600 Hv; wherein the hardness of the third layer is in a range of 200 Hv to 400 Hv; and wherein the hardness of the base material is in a range of 100 Hv to 200 Hv.

11 . The slide member according to claim 9 ,
wherein the first layer has a thickness in a range of 0.01 μm to 0.3 μm; wherein the second layer has a thickness in a range of 0.1 μm to 0.8 μm; and wherein the third layer has a thickness in a range of 0.2 μm to 2.0 μm.

12 . A refrigerant compressor comprising:
a sealed container which reserves lubricating oil therein; an electric component accommodated in the sealed container; and a compression component which is accommodated in the sealed container and activated by the electric component to compress a refrigerant; wherein the compression component includes a slide unit including the slide member according to claim 1 .

13 . The refrigerant compressor according to claim 12 ,
wherein the compression component includes: a crankshaft including a main shaft section and an eccentric shaft; a bearing section which supports the main shaft section such that the main shaft section is rotatable; a thrust section formed in the bearing section; a cylinder block having a bore defining a compression chamber; a piston which is reciprocatable inside the compression chamber; a piston pin which is placed in parallel with the eccentric shaft and fastened to the piston; and a connecting rod for connecting the eccentric shaft to the piston; wherein the slide member is at least one of the crankshaft, the thrust section, the bore of the cylinder block, the piston, the piston pin, and the connecting rod.

14 . The refrigerant compressor according to claim 12 ,
wherein the electric component is inverter-driven at any one of operating frequencies including at least an operating frequency which is equal to or lower than a power supply frequency.

15 . The refrigerant compressor according to claim 12 ,
wherein the lubricating oil has a viscosity in a range of VG3 to VG100.

16 . The refrigerant compressor according to claim 12 ,
wherein at least a natural refrigerant or a HFC based refrigerant is used as the refrigerant compressed by the compression component.

17 . The refrigerant compressor according to claim 16 ,
wherein the natural refrigerant is at least one of R600a, R290, and R744, or a mixture of R600a, R290, and R744.

18 . The refrigerant compressor according to claim 17 ,
wherein at least one selected from a group consisting of mineral oil, ester oil, alkyl benzene oil, polyvinyl ether, and polyalkylene glycol is used as the lubricating oil.

19 . The refrigerant compressor according to claim 16 ,
wherein the HFC based refrigerant is at least one of R134a, R152, R407C, R404A, R410, and R32, or a mixture of R134a, R152, R407C, R404A, R410, and R32.

20 . The refrigerant compressor according to claim 19 ,
wherein at least one selected from a group consisting of ester oil, alkyl benzene oil, polyvinyl ether, and polyalkylene glycol is used as the lubricating oil.

21 . A refrigerator comprising the refrigerant compressor according to claim 12 .

22 . An air conditioner comprising the refrigerant compressor according to claim 12 .

23 . A refrigerant compressor comprising:
a sealed container which reserves lubricating oil therein; an electric component accommodated in the sealed container; and a compression component which is accommodated in the sealed container and activated by the electric component to compress a refrigerant; wherein the compression component includes a slide unit including the slide member according to claim 6 .

24 . The refrigerant compressor according to claim 23 ,
wherein the compression component includes: a crankshaft including a main shaft section and an eccentric shaft; a bearing section which supports the main shaft section such that the main shaft section is rotatable; a thrust section formed in the bearing section; a cylinder block having a bore defining a compression chamber; a piston which is reciprocatable inside the

Assignees

• Panasonic Corp

Inventors

• Ishida Yoshinori
• Kawabata Hirotaka
• Fukuhara Hiroyuki
• Kume Yuichiro
• Futagami Yoshiyuki

Classifications

• C10N2040/30

  Refrigerators lubricants {or compressors lubricants} · CPC title

• C10N2030/06

  Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure · CPC title

• F05C2201/0436

  Iron · CPC title

• Y10T29/49281

  including coating or plating · CPC title

• F04B39/0005 Primary

  adaptations of pistons · CPC title