A low-temperature heat pump air-conditioning heat exchange system with anti-icing function

Abstract

The invention provides a low-temperature heat pump air conditioner heat exchanging system with an anti-icing function. The low-temperature heat pump air conditioner heat exchanging system comprises a compressor, a four-way valve, a plate-type heat exchanger, a gas-liquid separator, a finned type heat exchanger, a first throttling gear, a second throttling gear, a first check valve, a second check valve, a liquid storage tank, a filter and an anti-ice expansion pipe, wherein two pipe orifices of the four-way valve are respectively connected with the compressor and the plate-type heat exchanger, and another two pipe orifices of the four-way valve are respectively connected with the gas-liquid separator and the finned type heat exchanger; the gas-liquid separator is connected with the compressor, a heat pump branch and a defrosting branch are connected between the plate-type heat exchanger and the finned type heat exchanger; the heat pump branch comprises the first check valve, the liquid storage tank, the filter and the first throttling gear which are connected in sequence; the defrosting branch comprises the second throttling gear and the second check valve; one end of the anti-ice expansion pipe is connected with the first throttling gear, and the other end of the anti-ice expansion pipe is respectively connected with the second throttling device and the filter. The low-temperature heat pump air conditioner heat exchanging system provided by the invention can effectively inhibit generation of rime frosts at the bottom of the finned type heat exchanger, and slow down the freezing rate of the finned type heat exchanger.

Description

technical field [0001] The invention relates to the technical field of low temperature heat pump air conditioners, in particular to a low temperature heat pump air conditioner heat exchange system with anti-freezing function. Background technique [0002] At present, the existing low-temperature heat pump air-conditioning heat exchange systems generally do not have an anti-icing function, that is, there is no anti-icing structure for preventing the bottom of the finned heat exchanger from freezing or effectively slowing down its freezing rate. It may reduce its heat exchange efficiency. Especially in some harsh environments, such as the north where the temperature is low, the existing low-temperature heat pump air-conditioning heat exchange system will be damaged due to the bottom structure of the finned heat exchanger. Ice seriously affects its normal use. Therefore, with the continuous development of social science and technology, how to improve the existing low-temperatu...

AI Technical Summary

Problems solved by technology

[0002] At present, the existing low-temperature heat pump air-conditioning heat exchange systems generally do not have an anti-icing function, that is, there is no anti-icing structure for preventing the bottom of the finned heat exchanger from freezing or effectively slowing down its freezing rate. It may reduce its heat exchange efficiency. Especially in some harsh environments, such as the north where the temperature is low, the existing low-temperature heat pump air-conditioning heat exchange system will be damaged due to the bottom structure of the finned heat exchanger. Ice seriously affects its normal use

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