Multi-connected split air conditioning system

Abstract

The invention discloses a multi-connected split air conditioning system which comprises the components of a variable-capacity compressor, a fixed-capacity compressor, an oil separator assembly, a detecting device and a control valve assembly. The variable-capacity compressor is provided with a first air exhaust opening and a first air returning opening. The fixed-capacity compressor is provided with a second air exhaust opening and a second air returning opening. The oil separator assembly comprises an oil gas inlet and an oil outlet. The first air exhaust opening and the second air exhaust opening are connected with the oil gas inlet. The first air returning opening is communicated with the oil outlet through a first flow channel and a second flow channel. The second air returning opening is communicated with the oil outlet through a third flow channel. The detecting device detects the output quantity of the variable-capacity compressor. The control valve assembly performs controlling for opening or closing the second flow channel and the second flow channel according to the detecting result of the detecting device. The multi-connected split air conditioning system according to an embodiment of the invention can select different oil equalizing manners according to the output of the variable-capacity compressor, thereby preventing damage of the variable-capacity compressor and the fixed-capacity compressor caused by oversmall amount of lubricating oil.

Description

technical field [0001] The invention relates to the refrigeration field, in particular to a multi-connected air-conditioning system. 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 air-conditioning system usually has ten horses or even dozens of horses. The pipeline of the multi-connected air-conditioning system is complicated, and there are multiple compressors inside the module. The operating conditions of the compressors are different when the load is different. Some compressors may run at high load while others may not run. In this case, the oil distribution among the compressors is very likely to be unbalanced. Some compressors may have insufficient lubricating oil, and some compressors may have too much lubricating oil. Too much, which can easily cause damage to the compr...

AI Technical Summary

Problems solved by technology

The capacity of a multi-connected air-conditioning system usually has ten horses or even dozens of horses. The pipeline of the multi-connected air-conditioning system is complicated, and there are multiple compressors inside the module. The operating conditions of the compressors are different when the load is different. Some compressors may run at high load while others may not run. In this case, the oil distribution among the compressors is very likely to be unbalanced. Some compressors may have insufficient lubricating oil, and some compressors may have too much lubricating oil. Too much, which can easily cause damage to the compressor

[0003] For low-pressure chamber compressors, when the output of parallel compressors is unbalanced, the pressure inside the compressors is also different, and the oil will shift from the compressor with high pressure to the compressor with low pressure. If the oil inside the compressor is lower than The safe oil level will easily cause damage to the compressor

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