Ultra-low-temperature air energy heat pump unit with fast defrosting function

Abstract

The invention provides an ultra-low-temperature air energy heat pump unit with a fast defrosting function. The ultra-low-temperature air energy heat pump unit is mainly composed of a variable-frequency air-supplying compressor, a user side heat exchanger, an air-cooled evaporator, a vapor-liquid separator, a double-centrifugal separation flash vaporizer, a four-way valve, an electronic expansion valve, a solenoid valve and refrigerant pipelines, wherein the refrigerant pipelines are connected with the devices. The problem that under the low temperature environment, the heating and domestic hotwater preparation capacity of an ordinary heat pump is sharply reduced, and the problem of how to realize fast defrosting of an air energy heat pump under the environments of the outdoor low temperature and the high air relative humidity are mainly solved, and the air energy heat pump can efficiently and stably operate for a long time at the low environment temperature.

Description

technical field [0001] The invention relates to the technical field of heating, ventilating and air conditioning, in particular to an ultra-low temperature air-energy heat pump unit for rapid defrosting. Background technique [0002] In northern China, coal-fired heating is one of the main causes of winter smog and PM2.5 weather. In order to reduce heating smog in winter and effectively utilize clean energy, many provinces in northern China such as Beijing, Hebei, Tianjin, Henan, and Shanxi have successively promoted a series of policies such as "coal-to-electricity" and "coal-to-gas" in recent years. With the support and encouragement of various policies, air source heat pumps have achieved rapid development and ushered in a new period of development opportunities. [0003] The ambient temperature of ordinary air source heat pump units is generally above 0°C. In areas with cold climates, ordinary air source heat pumps cannot operate normally. Moreover, under the working c...

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Problems solved by technology

[0003] The ambient temperature of ordinary air source heat pump units is generally above 0°C. In areas with cold climates, ordinary air source heat pumps cannot operate normally.

Moreover, under the working conditions of heating and hot water production, since the outdoor side heat exchanger is placed outdoors, when the outdoor ambient temperature is low and the air contains a certain humidity, the outdoor heat exchanger is prone to frost, which will Seriously affect the performance of the unit, or even shut down

In order to solve the problem of frosting, some heat pumps are equipped with special defrosting devices, which will inevitably cause complex structure of the unit, increase costs, and at the same time, reduce the working efficiency of the heat pump

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