Electronic expansion valve opening control device and method for heating heat pump type air conditioner

摘要

The present invention relates to an apparatus and method for controlling the opening degree of an electronic expansion valve during heating of a heat pump type air conditioner. In the related art, since the pressure reducing mechanism is a capillary tube, when the inverter compressor is used, it is difficult to cope with a variable amount of refrigerant discharge. When the loads of the heat exchangers are different, there is a problem in that the refrigerant flow rate cannot be properly supplied to each indoor heat exchanger. Therefore, the present invention is an oil separator installed between the inverter compressor and the four sides to separate the oil and the refrigerant from the refrigerant of high temperature and high pressure, and the oil to enter the inverter compressor; A pressure sensor for detecting a condensation pressure of the refrigerant received from the oil separator and obtaining a condensation temperature proportional to the detected condensation pressure; Obtain the subcooled temperature which is the difference between the condensation temperature of the pressure sensor and the refrigerant temperature of the outlet side of each indoor heat exchanger, and according to the subcooled temperature, it is connected to each indoor heat exchanger to control the opening degree to control the supply of refrigerant to the outdoor heat exchanger. By adjusting the opening degree, even if the operating frequency of the inverter compressor is changed, the refrigerant circulation amount achieves the optimum cycle balance to improve performance and efficiency, and even if the load between the indoor heat exchangers varies, the refrigerant flow to each indoor heat exchanger can be properly supplied. To help.