Air-conditioner defrosting system and defrosting control method

Abstract

The invention relates to the technical field of air-conditioners, and discloses an air-conditioner defrosting system. The air-conditioner defrosting system comprises a refrigerating fluid loop, the refrigerating fluid loop comprises a compressor, an indoor heat exchanger, a throttling gear and an outdoor heat exchanger which are connected through pipes, and the indoor heat exchanger is arranged in an indoor unit; the air-conditioner defrosting system further comprises a bypass branch way, a pipe temperature sensing package, an air outlet temperature sensing package, an electrical heating piece and a controller; the bypass branch way is used for defrosting for the outdoor heat exchanger, the first end of the bypass branch way is connected with the pipeline between the compressor and the indoor heat exchanger, the second end of the bypass branch way is connected with the pipeline between the throttling gear and the outdoor heat exchanger, and an adjusting valve for adjusting the refrigerating fluid flow is arranged on the bypass branch way; the pipe temperature sensing package is used for detecting the pipe temperature of the outdoor heat exchanger; the air outlet temperature sensing package is used for detecting the air outlet temperature of the indoor unit; the electrical heating piece is used for regulating and controlling the air outlet temperature of the indoor unit; and the controller is electrically connected with the adjusting valve, the pipe temperature sensing package, the air outlet temperature sensing package and the electrical heating piece. By means of the air-conditioner defrosting system, the fault rate of a reversing valve can be reduced, meanwhile, a user can be prevented from being blown with cold air, and the user comfort is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to an air conditioner defrosting system and a defrosting control method. Background technique [0002] At present, most of the heat pump air conditioners, in the heating mode, if the temperature of the tube in the outdoor heat exchanger is detected to be low to a certain temperature, it will send a defrosting signal to the controller, and the controller will change the direction of the air by controlling the reversing valve. , so that the refrigerant enters the cooling mode, and at the same time, the speed of the external fan is reduced or even the external fan is stopped, so as to realize the defrosting of the frosted part of the outdoor heat exchanger and avoid subsequent influence on heat exchange. When the tube temperature of the outdoor heat exchanger rises to a certain temperature, a signal to stop defrosting is sent to the controller, and the controller controls the ...

AI Technical Summary

Problems solved by technology

However, this process gives the user an uncomfortable feeling of alternating cold and hot. At the same time, if the defrosting is frequent, the reversing valve is more prone to failure, which brings inconvenience to the user.

Although there is a bypass defrost through hot gas, when the defrost is bypassed, the amount of refrigerant circulation will be reduced, resulting in a low temperature of the air outlet of the indoor unit, which will bring discomfort to the user

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