Variable refrigerant volume system

Abstract

The invention discloses a variable refrigerant volume system, which comprises an outdoor unit device, a shunting device and a plurality of indoor unit devices, wherein 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; when the variable refrigerant volume system is in a pure heating mode, the shunting device controls the first electronic expansion valve to be completely switched off, and when the variable refrigerant volume system is controlled to enter a liquid discharge state, the shunting device periodically switches off and switches on the first electronic expansion valve. According to the variable refrigerant volume system, the first electronic expansion valve is controlled, and a high-temperature gaseous state refrigerant is enabled to completely enter heating indoor units, so that the heating effect of the variable refrigerant volume system can be ensured.

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 in the market. Among them, the two-pipe heat recovery multi-connection system can realize simultaneous cooling and heating. The internal unit can achieve a better heating effect, and it is necessary to prevent the presence of liquid refrigerant in the plate heat exchanger in the splitter device. [0003] In the related technology, the first electronic expansion valve is completely closed in the pure heating mode. After a period of time, some high-pressure and high-temperature gaseous ref...

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Problems solved by technology

[0003] In the related technology, the first electronic expansion valve is completely closed in the pure heating mode. After a period of time, some high-pressure and high-temperature gaseous refrigerant in the outdoor unit will gradually condense in the plate heat exchanger, and when the time is too long , these liquid refrigerants will be fed back to the gas-liquid separator, which will enter the heating inner unit with the gaseous refrigerant, resulting in insufficient heat from the indoor mechanism and fluctuations in the outlet air temperature, affecting the heating effect of the heating inner unit

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