Refrigerating machine

Abstract

A refrigerating device includes a compressor, a gas cooler, an expansion mechanism, an evaporator, a four-way valve, and a drying device sequentially connected by using refrigerant pipes. The refrigerating device uses a refrigerant mixture in which a combustible natural refrigerant and a carbon dioxide refrigerant are mixed, and the content of the carbon dioxide refrigerant in the refrigerant mixture is 20 to 50 mass %, or a maximum fill amount of the combustible natural refrigerant is 150g.

Description

technical field [0001] The present invention relates to a refrigeration device, and in particular to a refrigeration device using a mixed refrigerant containing carbon dioxide refrigerant. Background technique [0002] In refrigerators, vending machines, and freezers for display cases, CFC refrigerants such as dichlorofluoromethane (R-12) or chlorodifluoromethane (R-22) have traditionally been mostly used Hydrochlorocarbon refrigerants are used as refrigerants. If these refrigerants are released into the atmosphere and reach the ozone layer above the earth, there will be a problem of destroying the ozone layer. Therefore, up to now, the use of chlorofluorocarbon refrigerants and hydrochlorofluorocarbon refrigerants in refrigerators has been banned. Use or Restrictions on Use. [0003] For this purpose, use such as CH 2 FCF 3 (R-134a) and other hydrofluorocarbon refrigerants to replace the above refrigerants. However, even HFC refrigerants have the same level of problems...

AI Technical Summary

Problems solved by technology

[0007] However, if compared with the above-mentioned hydrocarbon-based refrigerants, the absolute performance as a refrigerant may be poor

In addition, material and mechanical reliability is worse than that of refrigerants used so far

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