Reliable oil return air conditioning unit and its control method

Abstract

The invention provides an air conditioner unit with reliable oil return and a control method. The air conditioner unit includes a plurality of compressors and N oil separators, all the compressors are arranged in parallel, and all the compressors are divided into N groups of compressor units. The air conditioner unit and control method with reliable oil return provided by the present invention divide multiple compressors into N groups and set up N oil separators to ensure effective oil separation flow rate and oil separation efficiency when the unit is operating at partial load, thereby reducing The refrigerated oil entering the air-conditioning unit improves the heat exchange efficiency of the air-conditioning unit and the stability of the oil separation and recovery cycle. Compared with the dual oil separation system with series check valves in the prior art, the resistance loss is smaller, the energy efficiency ratio is higher, and the bypass pipeline can Balance the oil level in the oil separator, and at the same time ensure that the compressor unit in the air conditioning unit can operate independently to ensure the stability of the system.

Description

technical field [0001] The invention relates to the technical field of air treatment equipment, in particular to an air conditioner unit with reliable oil return and a control method. Background technique [0002] Parallel units are generally composed of multiple compressors, oil separators, economizers, oil coolers, gas collection tanks, liquid receivers, and electric control boxes installed on the same frame, and matched with relevant piping components to form a unit. Its multiple compressors share an oil separator, a liquid receiver, and a gas collection tank to form a parallel compression system. However, the oil separator is designed and selected according to the full-load flow rate. When the exhaust flow rate drops, the oil separation efficiency of the oil drops significantly, especially the oil separation efficiency in the spin separation and collision sections drops significantly, and there is a problem of abnormal oil return of the unit. Contents of the invention ...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem of abnormal oil return in the parallel unit in the prior art when operating at part load, an oil return oil return system is provided that divides the compressor into multiple groups and sets up multiple oil separators for one-to-one correspondence to ensure the effect of oil separation Reliable air conditioning unit and control method

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