Control method and device for rapidly balancing pressure difference of air conditioning system and air conditioner

Abstract

The invention provides a control method and device for rapidly balancing the pressure difference of an air conditioning system and an air conditioner. The method comprises the steps that: after a compressor is shut down, the pressure difference between high pressure and low pressure is obtained; at least one of the following items is controlled according to the pressure difference: the rotating speed of delayed closing of an inner fan, the rotating speed of delayed closing of an outer fan, the opening degree of delayed closing of an expansion valve of an inner unit and the reversing duration of a four-way valve; and the rotating speed of delayed closing of the inner fan, the rotating speed of delayed closing of the outer fan, the opening degree of delayed closing of the expansion valve of the inner unit and the reversing duration of the four-way valve are in positive correlation with the pressure difference. According to the invention, the rotation speed of delayed closing of the inner fan, the rotation speed of delayed closing of the outer fan, the opening degree of delayed closing of the expansion valve of the inner unit and the reversing duration of the four-way valve are controlled through coupling of the high-low pressure difference; the high-low pressure difference after the compressor is shut down can be rapidly balanced; and starting failure of the compressor is avoided.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control method and device for quickly balancing the pressure difference of an air conditioning system, and an air conditioner. Background technique [0002] With the improvement of living standards, air conditioners have become an essential household appliance for thousands of households, especially multi-split air conditioner systems, which are more and more popular due to their high reliability and small installation space. [0003] At present, multi-split air-conditioning systems generally have an air bypass structure, but as the technology becomes more and more mature, the air bypass structure can be canceled through some control methods. However, canceling the gas bypass structure will cause the high and low pressure difference balance to be slow after shutdown, and if the high and low pressure difference is greater than the threshold value when restarting, the co...

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Problems solved by technology

[0004] The problem solved by the present invention is that the balance of high and low pressure difference in the existing control scheme is relatively slow, which leads to the problem that the compressor fails to start when restarting the machine

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