Defrosting control method used for air conditioner unit

Abstract

The invention belongs to the technical field of air conditioners and particularly provides a defrosting control method used for the air conditioner unit. The defrosting control method aims at solvingthe problems that an existing air conditioner unit has a poor effect in reducing the reversing noise of a four-way valve. The defrosting control method includes the steps that under the condition thatthe air conditioner unit meets defrosting conditions, the high-pressure pressure and the low-pressure pressure of the air conditioner unit are obtained; if the difference value of the high-pressure pressure and the low-pressure pressure is larger than or equal to the first preset difference value, the opening degree of an electronic expansion valve and / or the frequency of a frequency conversion compressor are / is adjusted, and the differential pressure between the high-pressure and the low-pressure pressure is rapidly adjusted; the high-pressure pressure and the low-pressure pressure of the air conditioner unit are obtained again; and if the difference value of the high-pressure pressure and the low-pressure pressure obtained again is smaller than or equal to the second preset difference value, the four-way valve is controlled to conduct reversing, a refrigerant in a refrigerant circulation loop flows reversely so as to achieve the defrosting function, the noise generated during reversing of the four-way valve is reduced to the largest degree, and therefore the user experience is effectively improved.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and specifically provides a defrosting control method for an air conditioning unit. Background technique [0002] With the continuous development of air-conditioning technology, users have put forward higher and higher requirements for the comprehensive performance of air-conditioning units. Since the air-conditioning unit realizes the heat exchange effect through the reciprocating heat exchange between the indoor and the outdoor of the refrigerant, the outdoor heat exchanger of the air-conditioning unit is prone to frost in winter, which affects the heat exchange effect of the air-conditioning unit. To ensure the heat exchange effect of the air-conditioning unit, the air-conditioning unit must defrost the outdoor heat exchanger when frosting occurs to ensure its normal heat exchange. [0003] The most economical and common defrosting method at present is to use the four-way valve to re...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the existing air-conditioning unit has a poor effect of reducing the reversing noise of the four-way valve, the present invention provides a defrosting control method for the air-conditioning unit, the air-conditioning unit The unit includes a refrigerant circulation circuit and an electronic expansion valve, an inverter compressor, and a four-way valve arranged on the refrigerant circulation circuit. The defrosting control method includes: when the air conditioning unit meets the defrosting conditions, obtaining the high pressure and low pressure of the air conditioning unit; if the difference between the high pressure and the low pressure is greater than or equal to the first preset difference, then adjust the opening of the electronic expansion valve and / or the variable frequency compression The frequency of the machine; obtain the high pressure and low pressure of the air conditioning unit again; if the difference between the obtained high pressure and the low pressure is less than or equal to the second preset difference, then control the four-way The valve is reversing so that the refrigerant in the refrigerant circulation circuit flows backwards to realize the defrosting function

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