Multi-split air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioners and particularly provides a multi-split air conditioning system and a control method thereof in order to solve the problems that an after oil returning operation of the multi-split air conditioning system, lots of refrigerants are sucked in one time during single-compressor operation, and a low compressor exhausting temperature is easily caused. The multi-split air conditioning system comprises a plurality of compressors and a plurality of gas-liquid separators corresponding to the multiple compressors; and a gas balance pipe anda liquid balance pipe adjustable in communicating state are connected between the multiple gas-liquid separators. The control method includes the following steps that within first set duration afteroil returning operation of the air conditioning system is completed, the states of the multiple compressors are acquired; and according to the states of the multiple compressors, the communicating state of the liquid balance pipe is adjusted. Due to the arrangement, the problems that after oil returning is completed, part of the compressors continuously suck in lots of liquid-state refrigerants inthe operation process of the compressors, and consequently the too low exhausting temperature is caused are solved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, and specifically provides a multi-connected air conditioning system and a control method thereof. Background technique [0002] Due to its flexible system layout, reliable and stable operation, and flexible allocation from small load operation to large load operation, the multi-connected air conditioning system has been widely used in buildings, shopping malls, factories and other environments. Compared with ordinary air conditioning systems, the amount of refrigerant circulating in multi-split air conditioning systems is larger. Especially for large-scale multi-connected systems, the refrigerant charge is especially large. In order to prevent excessive liquid refrigerant from entering the compressor to cause liquid hammer, a multi-connected air conditioning system usually includes multiple compressors and corresponding multiple gas-liquid separators. The multiple gas-liquid separators...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, in order to solve the problem that the exhaust gas temperature is low due to the continuous suction of a large amount of liquid refrigerant by the operation of some compressors in the existing multi-connected air-conditioning system after the oil return operation, on the one hand, the present invention provides a multi- A control method for an on-line air-conditioning system, the multi-on-line air-conditioning system includes a plurality of compressors and a plurality of gas-liquid separators corresponding to the plurality of compressors, and a gas balance pipe is connected between the plurality of gas-liquid separators and a liquid balance pipe whose communication state can be adjusted, the control method includes the following steps: within a first set time period after the oil return operation of the air conditioning system is completed, obtain the states of the multiple compressors; state of each compressor, adjust the communication state of the liquid balance pipe

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