Control method of air conditioning unit and air conditioning unit

Abstract

The invention discloses a control method of an air conditioning unit and the air conditioning unit. The actual suction gas superheat, the actual air supply opening superheat and the degree of supercooling of a compressor are calculated; when the actual suction gas superheat is within a first set range, the opening of a main electronic expansion valve is adjusted according to the actual suction gas superheat; when the actual suction gas superheat is not within the first set range, the opening of the main electronic expansion valve is adjusted according to the degree of supercooling; when the actual air supply opening superheat is within a second set range, the opening of an auxiliary electronic expansion valve is adjusted according to the actual air supply opening superheat; when the actual air supply opening superheat is not within the second set range, the opening of the auxiliary electronic expansion valve is adjusted, so that the maximal degree of supercooling is obtained. Therefore, quick distribution and adjustment of refrigerant on the main side and the auxiliary side are realized, and the degree of supercooling of the unit is quickly established; additionally, the opening of the auxiliary electronic expansion valve is adjusted, so that the maximal degree of supercooling is obtained, an economizer fully achieves the effects, and the whole machine is efficiently operated.

Description

technical field [0001] The invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning unit control method and the air conditioning unit. Background technique [0002] In the air-cooled heat pump unit with an economizer, the main circuit of the refrigerant uses an electronic expansion valve for throttling control. [0003] For the air-cooled vortex heat pump unit with an economizer, there is a problem of the distribution of the primary side refrigerant and the auxiliary side refrigerant. The opening of the main electronic expansion valve will directly affect the refrigerant flow of the auxiliary refrigerant, but the amount of refrigerant on the auxiliary side is not considered when controlling the opening of the main electronic expansion valve, resulting in a slow adjustment speed of the main electronic expansion valve, which affects The subcooling degree of the whole unit makes the unit unable to quickly establish the subc...

AI Technical Summary

Problems solved by technology

The opening of the electronic expansion valve on the main side will directly affect the refrigerant flow rate of the auxiliary side refrigerant, but the amount of refrigerant on the auxiliary side is not considered when controlling the opening of the main electronic expansion valve, resulting in a slow adjustment speed of the main electronic expansion valve, which affects The subcooling degree of the whole unit makes the unit unable to quickly establish the subcooling degree, and cannot give full play to the role of the fine flow of the electronic expansion valve; at the same time, the lack of refrigerant adjustment on the evaporating side of the economizer prevents the economizer from fully exerting its effectiveness

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