Heat pump system control method and heat pump system

Abstract

The invention provides a heat pump system control method and a heat pump system. The heat pump system comprises a compressor, an outdoor heat exchanger, a four-way reversing valve, a gas-liquid separator, and a heating device for heating the gas-liquid separator. The four-way reversing valve has a first state when the heat pump system is in refrigeration operation and a second state when the heatpump system is in heating operation. The control method comprises the step of after switching on the compressor, and before switching the first state of the four-way reversing value to the second state, controlling the heating device according to a state parameter of a refrigerant in the outdoor heat exchanger. The heating device is used for heating a refrigerant in the gas-liquid separator so asto promote refrigerant gasification, the refrigerant entering the four-way reversing valve from a gas outlet of the compressor is at a gas state, and a liquid-state refrigerant cannot be accumulated in the four-way reversing valve, so that the occurrence of the phenomenon of liquid impact caused when the four-way reversing valve reverses after starting up at a heating mode is avoided, and the four-way reversing valve is prevented from being damaged by liquid impact.

Description

technical field [0001] The invention relates to the field of air conditioning equipment, in particular to a heat pump system control method and the heat pump system. Background technique [0002] The air conditioner with cooling and heating functions uses a four-way reversing valve to change the direction of refrigerant flow to switch between cooling and heating modes. The four-way reversing valve includes a main valve and a pilot valve. change direction. [0003] After the air conditioner is shut down and placed in a low-temperature environment for a period of time, since the indoor temperature is higher than the outdoor ambient temperature, the refrigerant will slowly flow from the high-temperature indoor to the low-temperature outdoor, causing the refrigerant temperature to migrate. [0004] When the air conditioner is turned on for heating in a low-temperature environment, a large amount of refrigerant exists in the outdoor heat exchanger in liquid form, and the air con...

AI Technical Summary

Problems solved by technology

As the compressor continues to run, when the four-way reversing valve reaches the predetermined reversing time or the pressure difference acting on the four-way reversing valve is sufficient to control the four-way reversing valve to reversing, the second end of the four-way valve and the fourth end are filled with liquid refrigerant, if forced to compress and reversing, it will cause liquid hammer phenomenon inside the four-way reversing valve, resulting in damage to the four-way valve

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