Air-conditioner defroster

Abstract

The invention discloses an air-conditioner defroster. The defroster comprises a compressor, a four-way valve, an evaporator and a condenser. The defroster also comprises a first pipeline for connecting a liquid inlet of the evaporator with a liquid outlet of the condenser; a second pipeline for connecting an air return inlet of the evaporator with a first port of the four-way valve; a third pipeline for connecting an air inlet of the condenser with a second port of the four-way valve; a fourth pipeline for connecting an air outlet of the compressor with a third port of the four-way valve; a fifth pipeline for connecting a suction inlet of the compressor with a fourth port of the four-way valve; a bypass pipeline with one end communicated with the first pipeline and the other end communicated with the fourth pipeline; a bypass control valve arranged on the bypass pipeline for starting / closing the bypass pipeline; a throttle valve arranged on the first pipeline for regulating the flow of refrigerant in the first pipeline through adjusting the openness of the throttle valve. The invention combines the advantages of heat pump defrosting and hot gas bypass defrosting and can achieve the most effective defrosting.

Description

technical field [0001] The invention relates to the field of control systems of air conditioning devices, in particular to an air conditioner defrosting device. Background technique [0002] When the air conditioner is heating at low temperature, the condenser will frost, which will affect the heating effect of the air conditioner. At present, the defrosting of the air conditioner is carried out in the cooling state, and the following two defrosting methods are generally used: [0003] One is the defrosting of the heat pump using the four-way valve reversing. When defrosting, the four-way valve operates, and the air conditioner changes from a heating cycle to a cooling cycle, and the air conditioner absorbs heat from the system to provide the outdoor heat exchanger for defrosting. Since the heat generated by the indoor heat exchanger is a negative value, the amount of negative heat is roughly equivalent to the positive heat generated in the same time period. From an energ...

AI Technical Summary

Problems solved by technology

During this process, because only a small pressure drop occurs in the bypass solenoid valve in the system, the pressure difference between high and low pressure is small, and the input power of the compressor is seriously attenuated; when the hot steam enters the coil, the temperature and the ambient temperature are both low When the heat exchanger is used, the heat exchange effect is excellent, and when it flows out of the condenser, it has basically changed its phase into a refrigerant liquid, and its suction temperature is very low; the combined influence of these two factors has caused the exhaust temperature to attenuate extremely seriously

When the frost layer is thick, as the defrosting time continues, the exhaust gas temperature will drop to the point where defrosting is basically impossible, so that the defrosting stamina is insufficient.

Images