Multi-line air conditioning system and oil balance device and control method thereof

Abstract

The invention discloses an oil balance device of a multi-line air conditioning system. The oil balance device comprises an oil separator, a first oil returning pipeline, a second oil returning pipeline, an oil balance pipeline and a stop valve, the oil separator is provided with a mixed input end, a refrigerant output end, an oil returning output end and an oil balance output end, the first oil returning pipeline and the second oil returning pipeline are arranged in parallel, the first oil returning pipeline is communicated with the oil balance output end and the input ends of compressors, the second oil returning pipeline is communicated with the oil returning output end and the input ends of the compressors, an oil returning electromagnetic valve is arranged on the first oil returning pipeline, the oil balance pipeline is communicated with the first oil returning pipeline, and the stop valve is arranged on the oil balance pipeline. According to the device, the pipelines communicated between the compressors and different outdoor units are arranged, dynamic balance of lubricating oil between the different outdoor units in the multi-line air conditioning system and dynamic balance of lubricating oil between the different compressors of the same outdoor unit can be achieved, it is ensured that when air conditioning devices operate, the devices have plenty of lubricating oil to use, and the damage probability of the outdoor units is reduced. The multi-line air conditioning system with the oil balance device and a control method of the multi-line air conditioning system are provided.

Description

technical field [0001] The present invention relates to the technical field of air-conditioning equipment, and more specifically, to an oil balance device for a multi-connected air-conditioning system, and a multi-connected air-conditioning system with the above-mentioned oil balancing device. The present invention also relates to a multi-connected air-conditioning system described above. a method of control. 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 connecting pipelines are relatively complicated, and there are multiple compressors inside the system (the multiple compressors can be multiple parallel-connected compressors in one outdoor unit, or It can be compressors in multiple parallel ...

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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