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

A refrigerant and direct technology, applied in the direction of refrigeration and liquefaction, refrigerators, refrigeration components, etc., can solve the problems of waste of evaporation area, high degree of superheat, and reduction of cooling capacity, and achieve increased evaporation heat transfer area and simple composition structure , Improve the effect of cooling capacity

Pending Publication Date: 2020-08-14
GUANGDONG PROVINCE MODERN AGRI EQUIP RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0027] See figure 2 In this embodiment, the defrosting device that uses the defrosted refrigerant to directly spray and evaporate is integrated in the refrigeration system, and includes a refrigeration main pipe 5 for diverting the refrigerant to the evaporator 3 (a ) In the defrosting pipe 1 and the defrosting liquid outlet pipe 4 used to transport the defrosted refrigerant to the evaporator 3(b) that is being refrigerated, the defrosting pipe 1 is next to the main refrigeration pipe 5 Above, the first end of the defrosting liquid outlet pipe 4 is connected to the outlet of the evaporator 3(a) to be defrosted, and the end is connected to the inlet of the evaporator 3(b) being refrigerated. The connection point of the end is Between the expansion valve on the main refrigeration pipe 5 and the evaporator 3(b) that is refrigerating.

[0028] See figure 2 The first end of the defrosting pipe 1 is connected between the compressor 2 and the condenser 6, and the end is connected to t...

Embodiment 2

[0037] The difference from Embodiment 1 is that in this embodiment, the vapor-liquid mixture refrigerant is obtained by cooling the gas refrigerant or mixing the gas refrigerant and the liquid refrigerant, and the vapor-liquid mixture refrigerant is used as the defrosting medium. Yu Rongshuang. In this way, the use of a vapor-liquid mixture whose heat absorption capacity is not less than the heat release capacity as the defrosting medium is not only easy to control, but also does not reduce the refrigeration efficiency of the refrigeration system.

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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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B47/02F25B49/02
CPCF25B47/02F25B49/02F25B2347/02
Inventor 陈永春龙成树卢素珊汤石生肖波刘庚强胡光华吴耀森陈煜龙
Owner GUANGDONG PROVINCE MODERN AGRI EQUIP RES INST
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