Defrosting method and device for direct liquid spray evaporation of defrosted refrigerant

Abstract

The invention discloses a defrosting method and a device for direct liquid spray evaporation of a defrosted refrigerant. The defrosting method comprises the following steps of shunting a refrigerant of a refrigeration main pipeline to an evaporator to be defrosted, wherein a split refrigerant is used as a defrosting medium, and heat is released to melt frost on the evaporator; merging the defrosted refrigerant with a throttled refrigerant in the refrigeration main pipeline, and performing evaporative cooling on the defrosted refrigerant and the throttled refrigerant after the defrosted refrigerant and the throttled refrigerant enter the evaporator in a refrigeration state; and conveying the refrigerant back to a compressor for circulation work. According to the defrosting method and the device, the defrosted refrigerant and the throttled refrigerant in the refrigeration main pipeline are converged and enter the evaporator for evaporation, and the air return superheat degree is controlled to be close to a low value of a reasonable range, and at the moment, the evaporation temperature in the refrigeration system is similar to the evaporation temperature in the non-defrosting process,so that the refrigerating capacity is improved.

Description

Technical field [0001] The invention relates to the defrosting technology of a refrigeration system, in particular to a defrosting method and device that uses a defrosted refrigerant to directly spray and evaporate. Background technique [0002] The refrigerant defrosting technology is an energy-saving technology. In the prior art, a superheated gas refrigerant is generally used as the defrosting medium to defrost the evaporator; of course, liquid refrigerants are also used as the defrosting medium. [0003] Existing common defrosting refrigeration systems mainly adopt reverse cycle defrosting, liquid storage type discontinuous defrosting and other methods. In the above defrosting method, there are the following problems: [0004] 1. In the evaporator, in order to completely convert the refrigerant into a gas refrigerant, by controlling the opening of the expansion valve or the opening size of the evaporator, when the refrigerant moves to the back section of the evaporation channel, ...

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Problems solved by technology

[0004] 1. In the evaporator, in order to completely convert the refrigerant into gas refrigerant, the opening of the expansion valve or the opening size of the evaporator is controlled so that when the refrigerant moves to the back section of the evaporation channel, it is almost completely evaporated and converted into gas , although it can effectively prevent the liquid refrigerant from entering the compressor and protect the compressor, but since the gas refrigerant in the rear section of the evaporation channel will no longer evaporate and absorb heat, it will cause a decrease in the evaporation area of ​​the rear section of the evaporation channel Waste, and the evaporation temperature of the refrigeration system during defrosting is lower than that of non-defrosting, the degree of superheat is higher, and the cooling capacity is reduced

[0005] 2. The structure of the refrigeration system is complicated, and there are many branches and valves, resulting in high manufacturing costs of the entire refrigeration system, and the control method is also relatively complicated

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