Multi-split air conditioning system and oil balancing devices and control method of multi-split air conditioning system

Abstract

The invention discloses oil balancing devices of a multi-split air conditioning system. Each oil balancing device comprises an oil separator, a parallel connection device, an oil balancing pipeline and a stop valve, wherein the oil separator is provided with a mixed input end, a refrigerant output end and a lubricating oil output end; the parallel connection device is communicated with a first oil return pipeline and a second oil return pipeline at the lubricating oil output end and the input end of a compressor, the first oil return pipeline is provided with an oil return electronic expansion valve, the oil balancing pipeline is communicated with the first oil return pipeline, and the stop valve is arranged on the oil balancing pipeline. Pipelines enabling the compressors to be communicated with different outdoor units are arranged, dynamic balance of different outdoor units in the multi-split air conditioning system and different compressors in the same outdoor unit is achieved, it is guaranteed that enough lubricating oil is available for air conditioning devices in the running process, and the damage probability of the outdoor units is lowered. The invention further provides the multi-split air conditioning system with the oil balancing devices and a control method of the multi-split air conditioning system.

Description

technical field [0001] The present invention relates to the technical field of air-conditioning equipment, and more particularly, to an oil balancing device of a multi-connected air conditioning system, and a multi-connected air-conditioning system having the above-mentioned oil balancing device. a control method. Background technique [0002] The multi-connected air-conditioning system is composed of multiple air-conditioning subsystems, which can realize the free combination of one or more outdoor units and multiple or one indoor unit. [0003] Since the multi-connected air-conditioning system has multiple air-conditioning subsystems, its connection pipeline is relatively complicated, and there are multiple compressors inside the system (the multiple compressors can be multiple parallel compressors in an outdoor unit, or Can be multiple compressors in parallel outdoor units). In the process of working, compressors with different loads have different operating conditions....

AI Technical Summary

Problems solved by technology

During the working process, compressors with different loads have different operation conditions. Some compressors may operate at high load, while some compressors may not operate. In this case, it is very easy for each compressor to The problem of unbalanced distribution of lubricating oil between compressors, that is, some compressors may have insufficient lubricating oil, and some compressors may have too much lubricating oil, which can easily cause damage to the compressor

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