Control method and heat pump unit for controlling operation of compressor

Abstract

The invention relates to a control method for controlling operation of a compressor and an associated heat pump unit. According to one aspect of the invention, the control method for controlling operation of the compressor is provided. The control method comprises the steps of: obtaining an exhaust pressure (Pd) of the compressor (1); obtaining a suction pressure (Ps) of the compressor (1); comparing the obtained exhaust pressure (Pd) and the obtained suction pressure (Ps) with a preset pressure ratio limiting value; and controlling the operation of the compressor (1) based on the pressure ratio comparing result. According to the control method, the range exceeding of the operation pressure of the compressor can be prevented, so that the compressor can be effectively protected, and the service life of the compressor is prolonged.

Description

technical field

[0001] The present invention relates to the field of heat pumps, in particular to a control method for controlling the operation of a compressor and an associated heat pump unit, which are improved in the control of the operating pressure of the compressor. Background technique

[0002] At present, heat pump units (such as heating and cooling air-conditioning units and air source heat pump water heater units) usually stay at a single maximum pressure protection value for compressor pressure control (such as figure 2 The B-A horizontal line in the exhaust pressure upper limit line) and the minimum pressure protection value (such as figure 2 The E-C vertical line in the middle - the lower limit line of the inspiratory pressure). This protection method cannot completely protect the compressor (such as an inverter compressor) to operate within a reliable operating pressure range, so that it cannot guarantee the life cycle of the compressor.

[0003] Here, it sh...

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