Refrigeration cycle device

Abstract

An object of the present invention is to improve the capacity of the condenser while ensuring long-term reliability and maintaining the pressure in the back pressure chamber in a refrigeration cycle device using R32. The refrigerating cycle device of the present invention includes: a circulation flow path in which a compressor, an oil separator, a first on-off valve, a condenser, a decompression device, and an evaporator are sequentially connected by piping, and R32 as a refrigerant circulates; The first bypass flow path connecting the oil separator and the compressor through piping; the cooler installed in the first bypass flow path; the second bypass flow path connecting the compressor and condenser through piping; installed in the second bypass flow path The second on-off valve of the two-bypass flow path; a control mechanism that opens any one of the first on-off valve and the second on-off valve and closes the other.

Description

technical field [0001] The invention relates to a refrigeration cycle device. Background technique [0002] Difluoromethane (hereinafter referred to as "R32") has zero ozone destruction coefficient, and the global warming coefficient of R32 is about 1 / 3 of that of R410A. Therefore, by using R32 instead of R410A widely used in refrigeration cycle devices at present, it is possible to contribute to the reduction of environmental load. [0003] For example, Patent Document 1 describes a refrigerant compressor using R32. [0004] prior art literature [0005] patent documents [0006] Patent Document 1: Japanese Patent Laid-Open No. 2001-115963 [0007] Summary of the invention [0008] The problem to be solved by the invention [0009] However, a refrigerant compressor using R32 has a higher discharge gas temperature than a refrigerant compressor using R410A or the like. [0010] Therefore, compared with refrigerant compressors using R410A or the like, a refrigerant comp...

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Problems solved by technology

[0009] However, a refrigerant compressor using R32 has a higher discharge gas temperature than a refrigerant compressor using R410A etc.

[0010] Therefore, compared with refrigerant compressors using R410A, etc., the refrigerant compressors using R32 have resin parts and oil that are more likely to deteriorate, and there is a problem that long-term reliability cannot be ensured.

[0011] In addition, when the temperature of the discharged gas rises, the amount of R32 dissolved in the oil (refrigerant dissolved amount) decreases, so the refrigerant compressor using R32 also has the problem of a decrease in the pressure of the back pressure chamber.

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