An intelligent oil return multi-line system

Abstract

The invention relates to an intelligent oil return multi-connection system, which includes a refrigerant circulation circuit sequentially connected by a compressor, an oil separator, a four-way valve, an outdoor unit heat exchanger, an indoor unit heat exchanger and a gas-liquid separator ; Also includes a main oil return pipe and an auxiliary oil return pipe; the two ends of the main oil return pipe are respectively connected to the bottom of the oil separator and the inlet of the gas-liquid separator; one end of the auxiliary oil return pipe passes through the capillary I and the The side wall of the oil separator is connected, and the other end is connected to the suction port of the compressor; the discharge pipe of the compressor is provided with a temperature sensor I; the auxiliary oil return pipe is provided with a temperature sensor II. The invention is reasonable in design and remarkable in effect, and can intelligently judge whether the compressor is short of oil, and enter into oil return operation in good time, which not only ensures the normal operation of the system, but also saves electricity, reduces use costs, and meets market demand.

Description

technical field [0001] The invention relates to an air conditioning system, especially a multi-connection system, specifically an intelligent oil return multi-connection system. Background technique [0002] Compressor lubricating oil is an indispensable substance to ensure the normal operation of the compressor. The lubricating oil is miscible with the refrigerant, so the lubricating oil will flow with the refrigerant in the air conditioning system. [0003] Since the multi-split unit has the characteristics of long pipelines and many indoor units, the lubricating oil will gradually adhere to the pipelines or the heat exchanger of the air conditioner during the process of flowing with the refrigerant. As the running time of the air conditioner increases, less and less lubricating oil returns to the compressor. Therefore, it is necessary to increase the speed of the compressor to increase the flow rate of the refrigerant to return the lubricating oil to the compressor. Oil...

AI Technical Summary

Problems solved by technology

[0004] At present, the oil return operation of multi-line is mostly judged according to the running time, that is, when the oil return time is reached, regardless of whether the compressor is short of oil, the air conditioner will be forced to enter the oil return operation, resulting in waste of electricity

At the same time, it may also cause the phenomenon that the compressor runs out of oil when the oil return is required, but the oil return time is not reached, which affects the normal operation of the system

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