Refrigeration Circuit-Forming Member

• US 20120021247A1
• Filed: 03/19/2010
• Published: 01/26/2012
• Est. Priority Date: 03/27/2009
• Status: Abandoned Application

• Current Assignee: Gunma Prefecture, Sanden Corporation (Hisense Home Appliances Group Co., Ltd.)
• Original Assignee: Sanden Corporation (Hisense Home Appliances Group Co., Ltd.)
• Inventors: Komatsu, Shunji, Suzuki, Takashi
• Application Number:
  US13/260,721
• Publication Number:
  US 20120021247A1
• Time in Patent Office: Days
• US Class Current: 428/646
• CPC Class Codes: C09K 2205/126 Unsaturated fluorinated hydrocarbons
• CPC Class Codes: C09K 2205/24 Only one single fluoro component present
• CPC Class Codes: C09K 5/045 containing only fluorine as halogen
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2201/041 Carbon; Graphite; Carbon black
• CPC Class Codes: C10M 2201/05 Metals; Alloys
• CPC Class Codes: C10M 2201/061 Carbides; Hydrides; Nitrides
• CPC Class Codes: C10M 2201/066 Molybdenum sulfide
• CPC Class Codes: C10M 2201/105 Silica
• CPC Class Codes: C10M 2211/00 Organic non-macromolecular compounds containing halogen as ingredients in lubricant compositions
• CPC Class Codes: C10M 2213/062 Polytetrafluoroethylene [PTFE]
• CPC Class Codes: C10M 2229/02 Unspecified siloxanes; Silicones
• CPC Class Codes: C10N 2020/101 Containing Hydrofluorocarbons
• CPC Class Codes: C10N 2030/06 Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
• CPC Class Codes: C10N 2050/025 in the form of films or sheets
• CPC Class Codes: C10N 2070/00 Specific manufacturing methods for lubricant compositions
• CPC Class Codes: F25B 49/005 of safety devices F25B49/02 and F25B49/04 take precedence
• CPC Class Codes: Y10T 428/12708 Sn-base component
• CPC Class Codes: Y10T 428/12736 Al-base component
• CPC Class Codes: Y10T 428/12778 Alternative base metals from diverse categories
• CPC Class Codes: Y10T 428/12792 : Zn-base component
• CPC Class Codes: Y10T 428/12903 : Cu-base component
• CPC Class Codes: Y10T 428/12951 : Fe-base component
• CPC Class Codes: Y10T 428/31544 : Addition polymer is perhalogenated
• CPC Class Codes: Y10T 428/31678 : Of metal

Abstract

Disclosed is a refrigeration circuit-forming member which has a metal surface and is used for a refrigeration circuit in which HFO-1234yf that is a refrigerant configured of molecules having a double bond is used. The metal surface, which comes into contact with the HFO-1234yf, is covered with a coating layer that is not reactive with the HFO-1234yf within the range of temperature at which the HFO-1234yf is used. The coating layer is formed of any of a coating film that is firmly fixed to the metal surface, a coating layer that is formed by adhesion of a specific component added into the lubricant oil, and a coating layer that is formed by modification of the metal surface layer itself that forms the metal surface. Consequently, the chemical instability that is caused when the refrigerant HFO-1234yf comes into contact with the metal can be eliminated.

Claims

1. A refrigeration circuit-forming member which has a metal surface and is used for a refrigeration circuit in which HFO-1234yf that is a specific refrigerant configured of molecules having a double bond is used, characterized in that said metal surface of said member coming into contact with said HFO-1234yf is covered with a coating layer that is substantially not reactive with said HFO-1234yf within a range of temperature at which said HFO-1234yf is used, and said coating layer is formed by any of (1) fixing a coating film firmly to said metal surface, (2) applying a specific component, which is added into a lubricant oil circulated in said refrigerant circuit together with said HFO-1234yf, adhesively to said metal surface and (3) modifying a metal surface layer itself that forms said metal surface.

2. The refrigeration circuit-forming member according to claim 1, wherein said coating film which is fixed firmly to said metal surface is formed of any one selected from the group consisting of a DLC coating film, a resin-coating film, a tungsten•

carbide coating film, a molybdenum disulfide coating film, a boron nitride coating film, a zinc-plated coating film, a tin-plated coating film, an SiO₂-containing coating film, an Fe—

P-based electroplated coating film, an Fe—

W-based electroplated coating film, an Fe—

C-based electroplated coating film, an Fe—

N-based electroplated coating film, a Co-based electroplated coating film, a Co—

W-based electroplated coating film and a Cr-Mo-based electroplated coating film.

3. The refrigeration circuit-forming member according to claim 2, wherein a resin of said resin-coating film comprises polytetrafluoroethylene.

4. The refrigeration circuit-forming member according to claim 1, wherein said specific component, which is added into said lubricant oil and is applied adhesively to said metal surface, contains at least a silicone-based component or a fluorine-based component, or both of said components.

5. The refrigeration circuit-forming member according to claim 1, wherein modification of said metal surface layer itself is performed by anodic oxidation.

6. The refrigeration circuit-forming member according to claim 5, wherein said metal surface is formed of an aluminum or an aluminum alloy and said modification of said metal surface layer itself is performed by anodic oxidation of aluminum.

7. The refrigeration circuit-forming member according to claim 1, wherein a material for forming said metal surface contains at least one or more selected from the group consisting of an aluminum component, an Fe-based component and a Cu-based component.

8. The refrigeration circuit-forming member according to claim 1, wherein said refrigeration circuit is a refrigeration circuit for an air conditioning system for vehicles.

9. The refrigeration circuit-forming member according to claim 1, wherein said refrigeration circuit-forming member is an interior sliding member of a compressor provided in said refrigeration circuit.