Multi-connected air conditioner outdoor unit and its control method

Abstract

The invention provides a multi-split air conditioning outdoor unit and a control method thereof. The multi-split air conditioning outdoor unit comprises a variable-capacity low-pressure cavity compressor, a first one-way valve and a fixed-capacity low-pressure cavity compressor, and the variable-capacity low-pressure cavity compressor and the fixed-capacity low-pressure cavity compressor are respectively provided with a first oil balancing hole and a second oil balancing hole; an inlet of the first one-way valve is communicated with the second oil balancing hole through a second oil circuit, and an outlet of the first one-way valve is communicated with the first oil balancing hole through a first oil circuit; the first one-way valve is connected with a first throttling valve in parallel, the first oil circuit is provided with a first temperature detection device for detecting the temperature; the second oil circuit is provided with a second temperature detection device for detecting the temperature; a controller is used for receiving detection values of the first temperature detection device and the second temperature detection device, calculating temperature difference and judging whether oil balancing operation can be carried out or not according to the temperature difference. According to the technical scheme provided by the invention, the problem that the compressors are damaged due to a too-low oil level can be effectively avoided.

Description

technical field [0001] The present invention relates to the field of household appliances, and more specifically relates to a multi-connected air conditioner outdoor unit and a control method thereof. Background technique [0002] The multi-connected air-conditioning system consists of several air-conditioning equipment, which can realize the free combination of multiple outdoor units and multiple indoor units. The capacity of a multi-connected system is usually ten or even dozens of horses. The multi-connected system has complex pipelines. There are multiple compressors inside the outdoor unit module. When the load is different, the operation of each compressor is also different. Some of the compressors in the system may be running at high load, and some may not be running. In this case, the oil distribution among the various compressors is very likely to be unbalanced. Some compressors may have insufficient lubricating oil, and some compressors may be lubricated If there ...

AI Technical Summary

Problems solved by technology

The capacity of a multi-connected system is usually ten or even dozens of horses. The multi-connected system has complex pipelines. There are multiple compressors inside the outdoor unit module. When the load is different, the operation of each compressor is also different. Some of the compressors in the system may be running at high load, and some may not be running. In this case, the oil distribution among the various compressors is very likely to be unbalanced. Some compressors may have insufficient lubricating oil, and some compressors may be lubricated If there is too much oil, it is easy to cause damage to the compressor, especially for multi-connected air conditioner outdoor units with multiple low-pressure chamber compressors. When the output of parallel low-pressure chamber compressors is unbalanced, The pressure is not the same, the oil will shift from the high-pressure low-pressure chamber compressor to the low-pressure low-pressure chamber compressor, if the oil inside the low-pressure chamber compressor is lower than the safe oil level, it will easily cause damage to the low-pressure chamber compressor

Images