Rotary compressor

Abstract

It was found that a refrigerant mainly containing a carbon-carbon double bond-containing hydrofluoroolefin has a function to suppress abrasive wear, compared to conventional HFC-based refrigerants, because the hydrofluoroolefin generates iron fluoride especially on the surface of the vane and piston, where sliding force is severe, from hydrogen fluoride, even if it is generated in reaction with water and oxygen. It is possible to reduce abrasive wear, by using a refrigerant containing as the base component a hydrofluoroolefin as operating refrigerant and a refrigeration oil 3 miscible with the refrigerant and a vane 10 made of a high-speed tool steel and sintered and quenched, because hydrogen fluoride generated by decomposition of the refrigerant in the region of a vane tip region 10a and a piston 9 peripheral surface, where sliding force is severe is converted to iron fluoride. It is also possible to obtain a hardened structure containing carbides of W, Mo, Cr and V dispersed in a fine martensite matrix and produces the rotary compressor more cost-effectively by quenching and sintering the vane 10.

Description

TECHNICAL FIELD[0001]The present invention relates to assurance of reliability of a rotary compressor that uses a refrigerant mainly containing a chlorine atom-free, carbon-carbon double bond-containing hydrofluoroolefin having low global warming potential as its operating refrigerant, for use in refrigeration cycles such as room air conditioners, refrigerators and other air conditioning apparatuses.BACKGROUND ART[0002]HFC (hydrofluorocarbon) systems, which have zero ozone depletion potential, are increasingly used as the operating refrigerants for conventional refrigeration apparatuses, but on the other hand, the HFC-based refrigerants are also causing problems recently, because they have very high global warming potentials. Thus, under study are refrigeration apparatuses that use a refrigerant mainly containing a chlorine atom-free, carbon-carbon double bond-containing hydrofluoroolefin that has low global warming potential. Various studies are made on vanes and pistons used in th...

AI Technical Summary

Benefits of technology

[0009]Because the vane of the rotary compressor is made of a high-speed tool steel and nitridized or made of a sintered alloy steel and sintered and quenched in the present invention, it is possible to prevent abrasive wear caused by hydrogen fluoride generated in reaction of a refrigerant mainly containing a chlorine atom-free, carbon-carbon double bond-containing hydrofluoroolefin having low global warming potential with water and oxygen, as hydrogen fluoride is converted to iron fluoride, and thus, provide an inexpensive compressor higher in reliability for an extended period of time.

Problems solved by technology

HFC (hydrofluorocarbon) systems, which have zero ozone depletion potential, are increasingly used as the operating refrigerants for conventional refrigeration apparatuses, but on the other hand, the HFC-based refrigerants are also causing problems recently, because they have very high global warming potentials.

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