Refrigerator centralized cold source carbon dioxide cascade refrigeration system and refrigeration method

Abstract

The invention discloses a refrigerator centralized cold source carbon dioxide cascade refrigeration system and a refrigeration method. When multiple refrigerators are distributed and not centralized,a traditional Freon refrigerant cannot well solve the problems of liquid supply uniformity and oil return of each refrigerator. The refrigerator centralized cold source carbon dioxide cascade refrigeration system comprises an R134a compressor (1) and an R744 compressor (10), the R134a compressor is respectively connected with a secondary oil separator (2), an economizer (6) and an R134a gas-liquidseparator (9), the secondary oil separator is connected with a shell and tube heat exchanger (3), the shell and tube heat exchanger is connected with an evaporative condenser (4), the evaporative condenser is connected with an R134a reservoir (5), the R134a reservoir is connected with the economizer, the economizer is connected with an expansion valve (7), the expansion valve is connected with ancondensing evaporator (8), and the condensing evaporator is connected with the R134a gas-liquid separator, a desuperheater (12) and an R744 reservoir (13). The system is applied to refrigerator centralized cold source carbon dioxide cascade refrigeration.

Description

Technical field: [0001] The invention relates to a carbon dioxide cascade refrigeration system and a refrigeration method of a centralized cold source of a freezer. Background technique: [0002] In the freezer refrigeration system, it mainly consists of four parts: compressor, condenser, evaporator and capillary tube, forming a closed circulation system by itself. The heat around the evaporator in the freezer is transferred to the condenser behind the box to be released, so that the cycle goes round and round to achieve the purpose of refrigeration. [0003] At present, the refrigeration system of the freezer is generally equipped with a small compressor for each freezer. When the number of freezers is large, the operating cost of the freezer refrigeration system is increased. Refrigerants cannot solve the problem of uniform liquid supply and oil return for each freezer, so the cascade refrigeration system uses carbon dioxide as the low-pressure refrigerant. Invention co...

AI Technical Summary

Problems solved by technology

[0003] At present, the refrigeration system of the freezer is generally equipped with a small compressor for each freezer. When the number of freezers is large, the operating cost of the freezer refrigeration system is increased. Refrigerants cannot solve the problem of uniform liquid supply and oil return for each freezer, so the cascade refrigeration system uses carbon dioxide as the low-pressure refrigerant

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