Cascade storage temperature refrigerator and temperature control method

Abstract

The invention discloses a cascade storage temperature refrigerator, which comprises a compressor (21), a condensation evaporator (23), a refrigerating chamber evaporator (34) and an electric control device (36), wherein the condensation evaporator (23) is provided with a low pressure inlet (22C); a bypass pipeline (35) is arranged between a refrigerant pipeline before the inlet of the refrigerating chamber evaporator (34) and the low pressure inlet (22C) of the condensation evaporator (23); and the bypass pipeline (35) is provided with an electromagnetic valve (33) connected with the electric control device (36). When the temperature of a freezing chamber is higher and the temperature of a refrigerating chamber has reached the lower limit, the electromagnetic valve is opened to reduce the refrigerant passing through the refrigerating chamber evaporator, so that the temperature conditions of two chambers of the refrigerator are in the set ranges, and the problems caused by not matched temperatures of the two chambers in the prior art are avoided. The invention also discloses a temperature control method for the cascade storage temperature refrigerator. Corresponding control methods are provided for various temperature conditions of the refrigerating chamber and the freezing chamber, so the temperatures of the two chambers of the refrigerator are better matched.

Description

technical field [0001] The invention relates to a self-cascading double-temperature refrigerator and a temperature control method thereof. Background technique [0002] At present, the main control methods of dual temperature refrigerators are single control and double control. For dual-temperature single-control refrigerators, the cooling capacity of the refrigerator and freezer is naturally distributed according to the size of their respective evaporators, which makes it difficult to match the areas of the evaporators in the refrigerator and freezer. It is only controlled by the refrigerator, and the evaporation area of ​​the refrigerator and freezer is designed at a certain ambient temperature, usually 25°C, so the temperature control of the freezer is not accurate enough, and the freezer may be overcooled in a high temperature environment. Overheating of the freezer may occur in a low temperature environment, and it is difficult to meet the wide climate environment. ...

AI Technical Summary

Problems solved by technology

[0005] However, for such a self-cascading dual-temperature refrigerator, due to the influence of separation effects and other factors, it is impossible to accurately calculate the flow rate and proportion of the two refrigerant streams separated from the condensing evaporator, which are rich in high and low boiling points. Parameters, and changes in working conditions will have a great impact on the flow rate and ratio of the two refrigerants after separation, so it is very difficult to control the temperature of the refrigerator alone by relying only on the design of the evaporator area of ​​the refrigerator room and the area of ​​the freezer room evaporator. It is difficult to match the temperature of the two chambers, and there will also be problems such as starting the compressor when the refrigeration system is out of balance caused by the temperature mismatch between the two chambers, resulting in increased starting power of the compressor, difficulty in starting, and the action of the thermal protector, which will affect the compression. The service life of the machine and its accessories, the frequent start and stop of the compressor also increases the power consumption

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