Air-conditioning system and liquid-spray control method for compressor

Abstract

The invention relates to an air-conditioning system and a liquid-spray control method for a compressor. The air-conditioning system comprises the compressor (1), a condenser (2), a first throttling unit (3) and an evaporator (4), wherein a refrigerant circulating flow path is formed by the compressor (1), the condenser (2), the first throttling unit (3) and the evaporator (4). An air-suction liquid spray flow path (f1) used for communicating with an air suction port of the compressor (1) is branched off from the portion, corresponding to a refrigerant outlet pipe of the condenser (2), of the refrigerant circulating flow path. The air-conditioning system further comprises a liquid uniformizing mechanism (5) arranged in front of the air suction port of the compressor (1), and the liquid uniformizing mechanism (5) is used for evenly mixing a refrigerant located at the downstream position of an outlet of the evaporator (4) and a refrigerant from the air-suction liquid spray flow path (f1) in advance. According to the air-conditioning system and the liquid-spray control method for the compressor, the refrigerant from the evaporator and the refrigerant from the air-suction liquid spray flow path are evenly mixed in advance through the liquid uniformizing mechanism, so that regional equilibrium of an air-suction temperature field in front of the air suction port is promoted, the probability of frequent fluctuation of the throttling unit and frequent loading and unloading of the compressor can be lowered accordingly, and part of negative influences of the air-suction liquid spray process of the compressor on the air-conditioning system are eliminated to the maximum extent.

Description

technical field [0001] The invention relates to the field of air conditioning, in particular to an air conditioning system and a liquid injection control method for a compressor. Background technique [0002] In marine air-conditioning units, the load application range of marine screw compressors is usually 25% to 100%. However, there is a practical need to expand the working range of the marine screw compressor, which requires extending the lower limit of the load application range to 20%, or even lower. When the marine screw compressor is running at low load, due to the relatively small amount of refrigerant circulation, the cooling capacity used to cool the compressor motor is insufficient, which often leads to overheating of the compressor motor or exhaust overheating protection, or even shutdown. [0003] In order to solve this problem, at present, the method of suction and liquid injection is mainly used to supplement the refrigerant circulation, that is, the supercoo...

AI Technical Summary

Problems solved by technology

However, this method of suction and liquid injection will cause an unbalanced temperature field area, and the unbalanced temperature field area will cause frequent changes in the opening of the electronic expansion valve in the marine air-conditioning unit, which will cause frequent loading and unloading of the marine screw compressor, resulting in water supply problems. unstable water temperature

Images