Air source heat pump defrosting device based on multi-effect synthetic action at initial frosting stage

Abstract

The invention discloses an air source heat pump defrosting device based on a multi-effect synthetic action at an initial frosting stage. The air source heat pump defrosting device comprises a refrigerant circuit, an air circuit and a defrosting speed regulation system. At the initial frosting stage, a frost layer is sparse and short or is in a non-frozen liquid drop state, thereby being easy to remove. According to the air source heat pump defrosting device, the growing characteristics of the frost layer at the initial frosting stage are fully utilized, high-temperature, high-pressure and dry air directly acts on the finned surface of a second heat exchanger through air supply nozzles, and therefore quick defrosting with the multi-effect synthetic action including blowdown, thawing and evaporation is achieved. Meanwhile, the defrosting speed regulation system can control the acting time of the high-temperature and high-pressure air on the finned surface by changing the vertical movement speed of the air supply nozzles along the second heat exchanger so as to achieve the effect that the frost layer at different frosting degrees is completely removed. The air source heat pump defrosting device is low in defrosting energy consumption, normal heating running of a heat pump system is not influenced in the defrosting process, the heat supply time of the heat pump system is prolonged, and the heat supply efficiency of the heat pump system is improved.

Description

Technical field [0001] The invention is a technical field for the design and manufacturing of the refrigeration and air -conditioning system, involving an air -source heat pump frosting device based on the combination of multi -effect comprehensive effects in the early stages of frost. Background technique [0002] When the air source heat pump is heating in winter, there is a frosting problem with evaporator.Due to the formation and growth of the frost layer, the heat exchange ability of the evaporator decreases, the performance of the heat pump deteriorates, and it cannot work properly.Therefore, the air source heat pump must be frosting in time under frost. [0003] At present, the commonly used defrosting methods include reverse circulation defrosting and heat -by -boarding frost.Due to the frequent transformation of the four -way valve during the reverse circulation defrosting process, the refrigeration system compressor has a "running oil" phenomenon, reducing the reliabi...

AI Technical Summary

Problems solved by technology

The existing defrosting methods are based on the fact that the frost layer enters the full growth stage before defrosting. In order to melt the dense frost layer and evaporate the defrosted water, a lot of heat and time are consumed, which reduces the heating time and efficiency, resulting in air source The efficiency of the heat pump decreases throughout the operating cycle

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