Defrosting and refrigerating system and cold storage

Abstract

The invention relates to a defrosting and refrigerating system and a cold storage. The defrosting and refrigerating system comprises a compressor, a water disc defrosting pipe, an evaporator coil pipe and an air pressure difference switch. An outlet of the compressor is connected with an inlet of the evaporator coil pipe through a first branch and a second branch which are arranged in parallel. The first branch comprises a hot air by-pass pipe and the evaporator water disc defrosting pipe. The outlet of the compressor is connected with the inlet of the evaporator coil pipe through the hot air by-pass pipe and the evaporator water disc defrosting pipe sequentially. The hot air by-pass pipe is provided with a first control valve; and the second branch is provided with a second control valve. A defrosting control signal is generated when the pressure difference, between pressure obtained at an air pressure sampling port of an air inlet of an evaporator and pressure obtained at an air pressure sampling port of an air outlet of the evaporator, of the air pressure difference switch is larger than the defrosting starting pressure difference. The defrosting control signal triggers the first control valve to be switched to a starting state and triggers the second control valve to be switched to a stopping state. By adoption of the defrosting and refrigerating system and the cold storage, the defrosting efficiency of the evaporator of the cold storage is improved, the defrosting time is shortened, and influence on the cold storage temperature during defrosting is reduced.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to a defrosting refrigeration system and a cold storage. Background technique [0002] In cold storage refrigeration applications, when the operating temperature of the cold storage is lower than 0°C, especially when the operating temperature of the low-temperature refrigerator is lower than -18°C, the water vapor in the air in the cold storage will frost on the surface of the cold evaporator fins, The lower the temperature, the more serious the frosting will be. Frosting will lead to a serious drop in the heat transfer efficiency of the evaporator, a drop in the evaporation temperature, a decrease in the cooling capacity, an increase in the power consumption of the compressor, and a decrease in the energy efficiency ratio. Therefore, it is necessary to defrost the surface of the cold storage evaporator. [0003] At present, the surface defrosting of the evaporator used in sm...

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Problems solved by technology

[0006] The object of the present invention is to provide a defrosting refrigeration system and cold storage to solve the problems of low defrosting efficiency of the cold storage evaporator in the prior art, long defrosting time, large impact on the storage temperature of the cold storage during defrosting, and poor energy-saving effect of defrosting question

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