Air source ultralow temperature heat pump unit provided with supercooling frosting-restraining heat exchanger

Abstract

The invention discloses an air source ultralow temperature heat pump unit provided with a supercooling frosting-restraining heat exchanger. The air source ultralow temperature heat pump unit comprises an enhanced vapor injection compressor, a user side heat exchanger, a vapor and liquid separator, a heat source side heat exchanger, a plate heat exchanger and refrigerant pipelines used for connecting the enhanced vapor injection compressor, the user side heat exchanger, the vapor and liquid separator, the heat source side heat exchanger and the plate heat exchanger. The air source ultralow temperature heat pump unit solves the problem that in a winter heating and hot water obtaining mode, an outdoor heat exchanger is prone to frosting under the environment where the temperature is low and definite humidity is reached, and consequently the working performance of a unit is affected seriously. The air source ultralow temperature heat pump unit solves the problem that under the working condition that the air source ultralow temperature heat pump unit is used for heating and hot water making, an outdoor side heat exchanger is very prone to incomplete defrosting and consequently frost deposit is caused. By the adoption of the supercooling frosting-restraining heat exchanger, defrosting can be conducted effectively and thoroughly for a long time, and a frost layer is restrained from being generated on the bottoms of the heat exchangers.

Description

technical field [0001] The invention relates to the technical field of heating, ventilating and air conditioning, in particular to an air source ultra-low temperature heat pump unit using a subcooling anti-frost heat exchanger. Background technique [0002] At present, air source heat pump units have been widely used in school dormitories, hotels, bathing centers and other places, mainly for cooling, heating, and providing domestic hot water. The operating ambient temperature of ordinary air source heat pump units is generally -7 to 43°C. In areas with cold climates, ordinary air source heat pump units cannot operate normally. It is necessary to use an ultra-low temperature air source heat pump unit that can operate normally at a low ambient temperature (generally refers to an ambient temperature of about -15 to -20°C). However, even for ultra-low temperature air source heat pumps that can work normally in cold climates, when the outdoor ambient temperature is low and the a...

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Problems solved by technology

[0005] The invention solves the problem that the outdoor side heat exchanger is very easy to accumulate frost due to incomplete defrosting under the working conditions of heating and hot water production of the air source ultra-low temperature heat pump unit (the reason for this is usually because the bottom of the heat exchanger is frost difficulty)

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