Multi-split system and oil return control method thereof

Abstract

The invention provides a multi-split system and an oil return control method thereof. According to the multi-split air conditioning system, an oil separator of each outdoor unit comprises an inlet, a first oil return opening and a second oil return opening; the first oil return port and the second oil return port are connected with an air suction port of the compressor through a first oil return pipeline and a second oil return pipeline respectively, the first oil return port is formed above the second oil return port, and the controller is used for obtaining the first oil temperature of the first oil return pipeline and the exhaust temperature of an exhaust port of the compressor in each outdoor unit. Judging whether the oil separator lacks oil or not according to the first oil temperature and the exhaust temperature, and if yes, performing oil return control on the compressor; therefore, oil shortage detection is carried out on the oil separator timely and accurately through the two oil return ports of the oil separator, oil return control is carried out on the compressor when oil shortage occurs, the problem that oil return cannot be carried out on the compressor timely is solved, the oil return reliability of the compressor is improved, and the comfort of a user is guaranteed.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a multi-connected system and an oil return control method thereof. Background technique [0002] With the development of air-conditioning technology, the cooling capacity of the air conditioner is getting bigger and bigger. Through the parallel connection of multiple machines, a maximum of 4 modules have been connected in parallel, and the total cooling capacity has reached 360KW. In practical applications, due to factors such as complex multi-line installation scenarios, long connections and various operating loads (such as low-load operation, high-load operation, frequent start-up and stop), the lubricating oil is prone to deviation, and some compressors cannot return oil in time , causing the compressor to wear and affect the service life of the multi-line. [0003] The existing method mainly alleviates the problem that some compressors cannot return oil in time by l...

AI Technical Summary

Problems solved by technology

In practical applications, due to factors such as complex multi-line installation scenarios, long connections and various operating loads (such as low-load operation, high-load operation, frequent start-up and stop), the lubricating oil is prone to deviation, and some compressors cannot return oil in time , causing the compressor to wear and affect the service life of the multi-line

[0003] The existing method mainly alleviates the problem that some compressors cannot return oil in time by limiting the number of parallel connections of outdoor unit modules and timing oil return. However, this method not only affects the expansion of multi-line units, but also affects the comfort of users during oil return. Experience

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