Oil return control method and device for air-cooled heat pump air conditioner unit and its compressor

Abstract

The invention discloses an air cooled heat pump air conditioning unit and an oil return control method and device of a compressor thereof. The method comprises the steps of: in an oil return process of the compressor, if the air cooled heat pump air conditioning unit satisfies a set temperature stop condition, controlling a throttling component in the air cooled heat pump air conditioning unit to be opened to the predetermined maximum open degree and acquiring the current operation mode of the air cooled heat pump air conditioning unit; if the current operation mode is a heating mode, controlling the operating frequency of the compressor to be gradually reduced according to the exhaust pressure of the compressor, if the current operating mode is a refrigerating mode, controlling the operating frequency of the compressor to be gradually reduced according to the back pressure of the compressor till the operating frequency of the compressor is smaller than a first predetermined frequency or the oil return time of the compressor is longer than or equal to a first predetermined time, and controlling the compressor to quit the oil return process. Therefore, a purpose of returning oil really is achieved, and the stable operation of the unit as oil is returned is guaranteed.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a method for controlling oil return of a compressor in an air-cooled heat pump air conditioner unit, an oil return control device for a compressor in an air-cooled heat pump air conditioner unit, and an air-cooled air conditioner with the device. Heat pump air conditioning unit. Background technique [0002] In the air-cooled heat pump unit, when the system operates at low load for a long time, due to the low operating frequency of the compressor, refrigeration oil will be brought out while discharging gas, so oil return control is required. During the oil return process of the compressor, the compressor runs at a higher frequency. When the unit reaches the set temperature, the unit will be controlled to stop running, so that the real oil return cannot be achieved. Contents of the invention [0003] The present invention aims to solve one of the technical problems...

AI Technical Summary

Problems solved by technology

During the oil return process of the compressor, the compressor runs at a higher frequency. When the unit reaches the set temperature, the unit will be controlled to stop running, so that the real purpose of oil return cannot be achieved.

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