Multi-split system

Abstract

The invention discloses a multi-split system. The multi-split system comprises an outdoor unit device, a shunting device and multiple indoor unit devices; the shunting device comprises a gas-liquid separator, a first heat exchange assembly, a first electronic expansion valve, a second heat exchange assembly and a second electronic expansion valve. The shunting device controls the first electronic expansion valve according to a preset medium voltage initial control target value and obtains the supercooling degree values and superheat degree values of the heating indoor unit devices and opening degree values of throttling elements in all the indoor unit devices, and if the opening degree value of the throttling element in any indoor unit device reaches the maximum opening degree, the shunting device adjusts the current medium voltage control target value according to the supercooling degree values and the superheat degree values of the heating indoor unit devices. The multi-split system can automatically adjust the medium voltage control target value according to the state parameters of operating heating indoor units and operating refrigerating indoor units, so that the simultaneous refrigerating and heating effect of the multi-split system is optimal.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-connected system. Background technique [0002] With the continuous development of air-conditioning technology and the strengthening of people's awareness of environmental protection, heat recovery multi-line systems are becoming more and more popular in the market. The two-pipe heat recovery multi-connection system is one of the mainstream heat recovery multi-connection systems on the market at present. The two-pipe heat recovery multi-connection system can realize simultaneous cooling and heating. To achieve better results, it is necessary to carry out medium pressure control on the shunt device. [0003] In the related art, the medium pressure control strategy for the diverter device is to control the pressure difference between the front and rear of the first electronic expansion valve in the diverter device according to a certain value or within a certain r...

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Problems solved by technology

[0003] However, in the related art, the medium-pressure control strategy for the diverter device is to control the pressure difference before and after the first electronic expansion valve in the diverter device according to a certain value or within a certain range. This control strategy is often based on the manufacturer's various The data obtained from the simulation experiment is carried out, the adjustment range is not only limited, but also not intelligent enough, it is difficult to make the system run in a better state

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