Low ambient temperature air source heat pump air heater defrosting air supplement electromagnetic valve control method

Abstract

The invention provides a low ambient temperature air source heat pump air heater defrosting air supplement electromagnetic valve control method, and belongs to the field of improving the defrosting speed of an air heater. The main points of the technical scheme are that when the air heater operates in a heating mode, the air heater monitors own operating parameters and surrounding environmental parameters, and when defrosting conditions are met, the air heater enters a defrosting control preparation mode; after preparation, the air heater enters a defrosting mode; during entering the defrosting mode, an air supplement electromagnetic valve is in an open state, a four-way valve switches into a refrigerating state, an outdoor fan stops, a main electronic expansion valve enters the defrostingopening degree, and an indoor fan operates in a residual heat blowing mode; in the defrosting process, the situation whether the condition of closing the air supplement electromagnetic valve is met or not is judged, and if yes, the air supplement electromagnetic valve is closed; the situation whether the air heater meets the condition of exiting the defrosting mode is judged, and if yes, the airheater enters an exiting defrosting control preparation mode; and after exiting the defrosting control preparation mode, the air heater exits the defrosting mode and enters the heating mode.

Description

technical field [0001] The invention relates to a technology for increasing the defrosting speed of a hot air blower, in particular to a method for controlling a defrosting air supplement electromagnetic valve of a low ambient temperature air source heat pump hot air blower. Background technique [0002] The low ambient temperature air source heat pump fan is a motor-driven vapor compression cycle that transfers heat from the air in an outdoor low temperature environment not lower than -25°C to a closed space, room or area. [0003] The ultra-low temperature forced heating requirements of the low ambient temperature air source heat pump fan can be realized by using the air-supplementing and enthalpy-increasing compressor. During the heating process of the air heater, the outdoor heat exchanger will frost due to the low temperature. If the frost layer is too thick, it will affect the heating effect of the air heater. Defrost control must be used to improve the heating effect....

AI Technical Summary

Problems solved by technology

The air supply solenoid valve of the traditional hot air blower is closed during the defrosting process. The defrosting speed of the system is slow, and the time of no heating is long, which is poor in terms of the user's subjective experience and energy saving considerations.

If the solenoid valve is turned on during the defrosting process, the air supply port of the compressor will enter the liquid refrigerant, which will affect the service life of the compressor or even burn the compressor

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