Multi-connection noise reduction control method and multi-connection

Abstract

The invention relates to a noise reduction control method of a multi-split machine. The method comprises the following steps: (S1) when the multi-split machine is started by heating, an air pipe pressure Pc and a liquid pipe pressure Pliq are obtained, and meanwhile, the supercooling degree of each started indoor unit is obtained; (S2) a difference value of the air pipe pressure Pc and the liquidpipe pressure Pliq is compared with a preset reference pressure Py; and meanwhile, the obtained supercooling degree of each started indoor unit is compared with a preset reference temperature T1; and(S3) the openness of all outdoor electronic expansion valves of the outdoor units and the openness of indoor electronic expansion valves of each started indoor unit are adjusted according to the comparison result. The invention further relates to the multi-split machine, which adopts the noise reduction control method. The method has the following advantages: when the multi-split machine is operated by heating, the noise generated at the time of stopping the indoor units receiving stop instructions is effectively reduced, so that the user use comfort can be greatly improved.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a multi-line noise reduction control method and the multi-line. Background technique [0002] One-to-many multi-connection units include an outdoor unit and multiple indoor units. The outdoor unit includes internal and external heat exchangers and several outdoor electronic expansion valves. Each indoor unit includes an indoor heat exchanger and indoor electronic expansion valves. Since the above-mentioned multi-split unit has only part of the indoor units running during operation, when the multi-split unit is running in the heating mode, in order to avoid the accumulation of refrigerant in the shut-down indoor units, generally the shut-down indoor unit The electronic expansion valve of the multi-split unit is opened to a preset opening degree, but since the pressure of the refrigerant and the vapor-liquid state of the refrigerant are unstable when the multi-split unit is started for heating...

AI Technical Summary

Problems solved by technology

Since the above-mentioned multi-split unit has only part of the indoor units running during operation, when the multi-split unit is running in the heating mode, in order to avoid the accumulation of refrigerant in the shut-down indoor units, generally the shut-down indoor unit The electronic expansion valve of the multi-split unit is opened to a preset opening degree, but since the pressure of the refrigerant and the vapor-liquid state of the refrigerant are unstable when the multi-split unit is started for heating, when the refrigerant flows through the indoor unit that is turned on, it will easily cause corresponding The throttling noise on the condensing side of the indoor unit (at the electronic expansion valve of the indoor unit) is too loud, which will reduce the comfort of users

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