Carbon dioxide refrigerator

Abstract

The invention is a carbon dioxide refrigerator, which includes compressor, condenser, two-position three-way electromagnetic valve, crisis spanned capillary, subcritical capillary, evaporator, temperature sensor, controller. The system uses carbon dioxide refrigerating agent, the compressor has two gears of rotation speed, and the output aperture of the condenser is distributed with temperature sensor for sensing the refrigerating temperature here. When the temperature measured by the sensor is lower than 28deg.C, the compressor uses low rotation speed, the subcritical capillary is connected; when the temperature is higher than 28deg.C, the compressor uses high rotation speed, the crisis spanning capillary is connected. The system can avoid the carbon dioxide condensing temperature from change in the near-critical area, thus it can upgrade the system efficiency effectively; the match of the system in critical spanning circulation and the subcritical circulation; it avoids the problem that the cold quantity generated by the compressor is not enough but it runs in a long time, it also can avoid the problem that the cold quantity is too large leading to that the starting-up and closing period is short.

Description

Technical field: [0001] The invention relates to a refrigerator, in particular to a carbon dioxide refrigerator using carbon dioxide as a refrigerant, which is used for food storage and preservation, and belongs to the technical field of refrigeration. Background technique: [0002] A large amount of artificially synthesized refrigerants have been used in refrigeration devices and have caused serious damage to the environment. Although people can work hard to synthesize refrigerants with better performance, due to the inevitable discharge of refrigerants, the mass production and use of any artificially synthesized refrigerants will cause adverse effects on the environment. To fundamentally solve the problem of refrigerant damage to the environment, non-synthetic natural refrigerants should be used. [0003] Carbon dioxide is non-toxic, non-flammable, easy to obtain, and low in price. It is considered to be an ideal natural refrigerant and has received widespread attention f...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to address the deficiencies in the prior art, to design and provide a refrigerator using carbon dioxide as a refrigerant, to overcome the problem that the existing carbon dioxide refrigeration system cannot ensure a good matching of the system during transcritical and subcritical cycles, and The problem that the system efficiency drops significantly when the refrigerant condensing temperature is close to the critical temperature in the subcritical cycle

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