Ultra-low temperature air source heat pump non-stop defrosting device

Abstract

The invention discloses an ultra-low temperature air source heat pump non-stop defrosting device which comprises an outdoor machine fin heat exchanger, a main way electronic expansion valve, a four-way valve and a pipeline. The outer side of the outdoor machine fin heat exchanger is provided with a defrosting auxiliary way in a connected manner, the defrosting auxiliary way comprises an outdoor machine fin heat exchanger, an intermediate heat exchanger, a defrosting auxiliary way electronic expansion valve, a defrosting compressor, a frosting sensor and a defrosting auxiliary way refrigerant liquid storage tank, and the frosting sensor is fixedly mounted on the surface of the outdoor machine fin heat exchanger; and the defrosting auxiliary way is additionally arranged, the ultra-low temperature air source heat pump non-stop defrosting effect is achieved, the main way four-way valve cannot be reversed when an ultra-low temperature air source heat pump conducts defrosting, an indoor place is in the heating state all the time to guarantee the stable indoor temperature, the defrosting compressor is started, frost is removed by the exhaust gas temperature and evaporates in the intermediate heat exchanger after passing through the expansion valve, the indoor comfort is improved, and the unit energy efficiency ratio is obviously improved after evaporation and temperature rising.

Description

technical field [0001] The invention belongs to the technical field of ultra-low temperature air source heat pumps, and in particular relates to a non-stop defrosting device for ultra-low temperature air source heat pumps. Background technique [0002] When the ultra-low temperature air source heat pump works in an environment with low temperature and high humidity, it will accelerate the frosting of the finned heat exchanger, while the conventional defrosting method will cause the heating to stop during the defrosting process, and the indoor temperature fluctuates greatly, which reduces the comfort. It is greatly discounted, so how to choose a suitable defrosting method and a more humanized defrosting control method is also a very important issue for air source heat pumps used in low temperature environments. For this reason, we propose a non-stop defrosting device for ultra-low temperature air source heat pumps . Contents of the invention [0003] The object of the pres...

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Problems solved by technology

[0002] When the ultra-low temperature air source heat pump works in an environment with low temperature and high humidity, the frosting of the finned heat exchanger will be accelerated, while the conventional defrosting method will cause the heating to stop during the defrosting process, and the indoor temperature fluctuates greatly, and the comfort It is greatly discounted, so how to choose a suitable defrosting method and a more humanized defrosting control method is also a very important issue for air source heat pumps used in low temperature environments. For this reason, we propose a non-stop defrosting device for ultra-low temperature air source heat pumps

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