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

Abstract

The invention provides an oil balance control method and an oil balance control device for a multi-connected air-conditioning system, and a multi-connected air-conditioning system. Each outdoor unit in the multi-connected air-conditioning system includes an oil balancing device and a compressor, and the oil balancing device includes: an oil separator, Oil balance electronic expansion valve, oil return solenoid valve and oil balance cut-off valve, the oil balance electronic expansion valve is connected in series to the oil balance line between the oil balance output end of the oil separator and the oil balance stop valve, and the oil return solenoid valve is connected in series The oil return line between the output end of the oil balance electronic expansion valve and the input end of the compressor. The oil balance control method includes: when each outdoor unit is in the running state, obtain the oil quantity status of the compressor; collect oil balance electronic expansion valve The current opening of the valve; determine whether to adjust the current opening of the oil balance electronic expansion valve and the current working state of the oil return solenoid valve according to the state of the oil quantity. This technical solution can effectively ensure the reasonable and accurate dynamic balance distribution of lubricating oil 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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