Refrigerant compressor and cooling apparatus comprising the same

• US 6,035,661 A
• Filed: 05/21/1999
• Issued: 03/14/2000
• Est. Priority Date: 09/30/1996
• Status: Expired due to Term

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Okajima, Masazo, Ando, Kenji, Obokata, Yoshinobu, Ishikawa, Kazuhisa, Watanabe, Masato, Sunaga, Takashi, Takahashi, Yasuki
• Primary Examiner(s): Bennett, Henry
• Assistant Examiner(s): Drake, Malik N.
• Application Number:
  US09/316,540
• Time in Patent Office: 298 Days
• Field of Search: 62/114, 62/468, 62/469, 62/498, 252/68, 252/67
• US Class Current: 62/498
• CPC Class Codes: C09K 2205/22 All components of a mixture being fluoro compounds
• 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 107/24 containing monomers having an unsaturated radical bound to an alcohol, aldehyde, ketonic, ether, ketal or acetal radical
• CPC Class Codes: C10M 129/10 having hydroxy groups bound to a carbon atom of a six-membered aromatic ring
• CPC Class Codes: C10M 129/18 Epoxides
• CPC Class Codes: C10M 133/22 containing a carbon-to-nitrogen double bond, e.g. guanidines, hydrazones, semicarbazones
• CPC Class Codes: C10M 137/04 Phosphate esters
• CPC Class Codes: C10M 169/04 Mixtures of base-materials and additives
• CPC Class Codes: C10M 171/008 Lubricant compositions compatible with refrigerants
• CPC Class Codes: C10M 2207/023 having hydroxy groups bound to carbon atoms of six-membered aromatic rings
• CPC Class Codes: C10M 2207/026 with tertiary alkyl groups
• CPC Class Codes: C10M 2207/027 Neutral salts thereof
• CPC Class Codes: C10M 2207/042 Epoxides
• CPC Class Codes: C10M 2209/04 containing monomers having an unsaturated radical bound to an alcohol or ester thereof; bound to an aldehyde, ketonic, ether, ketal or acetal radical
• CPC Class Codes: C10M 2209/043 used as base material
• CPC Class Codes: C10M 2209/06 containing monomers having an unsaturated radical bound to an acyloxy radical of saturated carboxylic or carbonic acid
• CPC Class Codes: C10M 2209/062 Vinyl esters of saturated carboxylic or carbonic acids, e.g. vinyl acetate
• CPC Class Codes: C10M 2211/022 aliphatic
• CPC Class Codes: C10M 2211/06 Perfluorinated compounds
• CPC Class Codes: C10M 2215/14 : Containing carbon-to-nitrogen double bounds, e.g. guanidines, hydrazones, semicarbazones
• CPC Class Codes: C10M 2223/04 : Phosphate esters
• CPC Class Codes: C10M 2223/041 : Triaryl phosphates
• CPC Class Codes: C10M 2223/042 : Metal salts thereof
• CPC Class Codes: C10N 2040/00 : Specified use or application for which the lubricating composition is intended
• CPC Class Codes: C10N 2040/30 : Refrigerators lubricants or compressors lubricants
• CPC Class Codes: C10N 2040/32 : Wires, ropes or cables lubricants
• CPC Class Codes: C10N 2040/34 : Lubricating-sealants
• CPC Class Codes: C10N 2040/36 : Release agents or mold release agents
• CPC Class Codes: C10N 2040/38 : Conveyors or chain belts
• CPC Class Codes: C10N 2040/40 : Generators or electric motors in oil or gas winning field
• CPC Class Codes: C10N 2040/42 : Flashing oils or marking oils
• CPC Class Codes: C10N 2040/44 : Super vacuum or supercritical use
• CPC Class Codes: C10N 2040/50 : Medical uses
• CPC Class Codes: F25B 31/002 : Lubrication

Abstract

A refrigerant compressor is configured such that a compressor unit is installed in a hermetically sealed container, an HFC type refrigerant or a mixture thereof and a refrigerator oil having compatibility with the refrigerant are charged into the hermetically sealed container, and the refrigerator oil essentially comprises a polyvinyl ether type compound having structural units represented by the following general formula (1): ##STR1## wherein n is an integral number in the range of 1 or more, R1 to R3 are each a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms and may be the same or different, R4 is an alkyl group having 1 to 4 carbon atoms, and units in which R4 is an alkyl group having 1 to 2 carbon atoms are 40 to 100% and units in which R4 is an alkyl group having 3 to 4 carbon atoms are 0 to 60%. As a result, the generation of a carboxylic acid caused by thermal cracking or hydrolysis due to frictional heat generated by sliding members is prevented and the generation of sludge is thereby suppressed.

Claims

1. A cooling apparatus comprising a refrigerant compressor comprising a hermetically sealed container and a compressor unit installed in the hermetically sealed container, a condenser, an expansion device and an evaporator, which are connected by pipes, wherein an HFC type refrigerant or a mixture thereof and a refrigerator oil having compatibility with the refrigerant are charged into the hermetically sealed container, and the refrigerator oil essentially comprises a polyvinyl ether type compound having structural units represented by the following general formula (1):

##STR8## wherein n is an integral number in the range of 1 or more, R1 to R3 are each a hydrogen atom or a hydrocarbon group having 1 to 8 carbon atoms and may be the same or different, R4 is an alkyl group having 1 to 4 carbon atoms, and units in which R4 is an alkyl group having 1 to 2 carbon atoms are 40 to 100% and units in which R4 is an alkyl group having 3 to 4 carbon atoms are 0 to 60%.