Oil balance control method, oil balance control device and multi-unit air conditioning system

Abstract

The invention provides an oil balance control method, an oil balance control device and a multi-unit air conditioning system. The oil balance control method and the oil balance control device are applied to the multi-unit air conditioning system. Every outdoor unit of the multi-unit air conditioning system is composed of an oil balance device and a compressor, wherein the oil balance device is composed of an oil separator, an oil balance electronic expansion valve, an oil return electromagnetic valve and an oil balance check valve, the oil balance electronic expansion valve is connected in series with an oil balance pipe between the oil balance output end of the oil separator and the oil balance check valve, and the oil return electromagnetic valve is connected in series between the output end of the oil balance electronic expansion valve and the input end of the compressor. The oil balance control method comprises, when the outdoor units are in a working state, acquiring the oil state of every compressor; collecting the current opening degree of every oil balance electronic expansion valve; according to the oil state, determining whether to adjust the current opening degree of the corresponding oil balance electronic expansion valve and the current working state of the corresponding oil return electromagnetic valve. The oil balance control method, the oil balance control device and the multi-unit air conditioning system can effectively ensure dynamic and balanced distribution of lubricant among the compressors.

Description

technical field [0001] The invention relates to the technical field of multi-connected air conditioners, in particular to an oil balance control method for a multi-connected air-conditioning system, an oil balance control device for a multi-connected air-conditioning system, and a multi-connected air-conditioning system. Background technique [0002] The multi-connected air-conditioning system is composed of multiple air-conditioning subsystems, which can realize the free combination of multiple outdoor units and multiple indoor units. [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 outdoor units). During the working process, compressors with different loads have different operati...

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

At the same time, the accuracy of lubricating oil distribution control between compressors is poor, and there is certain uncertainty about whether each compressor can distribute the appropriate amount of oil

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