Multiple on-line system and control method thereof

Abstract

The invention discloses a multiple on-line system and a control method thereof. The multiple on-line system comprises an outdoor unit, multiple indoor units and a refrigerant amount adjusting device.The outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchanger and an outdoor throttling valve; the refrigerant amount adjusting device comprises an intermediate heat exchanger,an adjustable throttling valve, an electromagnetic valve and a gas-liquid separator, and is used for enabling the refrigerant amount to reach to the appropriate state through controlling the electromagnetic valve to be opened and adjusting the opening degree of the adjustable throttling valve when the refrigerant amount of the multiple on-line system is excessive or in shortage. According to the multiple on-line system provided by the embodiment of the invention, not only can the energy efficiency of system operation be improved, but also the liquid impact problem produced by liquid return ofthe compressor can be avoided, and the system operation reliability is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-connection system and a control method for the multi-connection system. Background technique [0002] Usually, a multi-connected system is equipped with multiple indoor units with one outdoor unit. Therefore, under different working conditions and different loads, the amount of refrigerant required for the actual operation of the system varies. During the installation process of a multi-connected system, the refrigerant The charging amount is determined according to the design value of full load. However, the actual refrigerant circulation amount cannot be changed according to the actual load during system operation, so that the refrigerant amount of the system is too much or too little, which not only reduces the energy efficiency of the system operation, It is also possible to cause the compressor to return liquid and produce liquid hammer, which reduces the re...

AI Technical Summary

Problems solved by technology

[0002] Usually, a multi-connected system is equipped with multiple indoor units with one outdoor unit. Therefore, under different working conditions and different loads, the amount of refrigerant required for the actual operation of the system varies. During the installation process of a multi-connected system, the refrigerant The charging amount is determined according to the design value of full load. However, the actual refrigerant circulation amount cannot be changed according to the actual load during system operation, so that the refrigerant amount of the system is too much or too little, which not only reduces the energy efficiency of the system operation, It may also cause the compressor to return to the liquid and cause liquid shock, which will reduce the reliability of the system operation.

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