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How to judge the quality of automobile air-conditioning compressors

How to judge the quality of automobile air-conditioning compressors

The quality of the compressor is the efficiency of the compressor when it is working. Under normal circumstances, after connecting the three-way pressure gauge group, start the engine. If the low pressure pointer of the instrument drops rapidly and the high pressure rises rapidly, when the accelerator is increased When the range of this change of the pointer becomes larger and larger, it indicates that the performance is good. On the contrary, if the above-mentioned operation is performed, the amplitude of the change is not large, which indicates that the efficiency is low and not very good.

ZHONGCHENG

The quality of the compressor is the efficiency of the compressor when it is working. Under normal circumstances, after connecting the three-way pressure gauge group, start the engine. If the low pressure pointer of the instrument drops rapidly and the high pressure rises rapidly, when the accelerator is increased When the range of this change of the pointer becomes larger and larger, it indicates that the performance is good. On the contrary, if the above-mentioned operation is performed, the amplitude of the change is not large, which indicates that the efficiency is low and not very good.

If there is no obvious change in the pointer at all, it means it is inefficient and may no longer be used normally.

 

The automobile air-conditioning compressor is the heart of the automobile air-conditioning refrigeration system, which plays the role of compressing and transporting refrigerant vapor. Compressors are divided into two types: invariable displacement and variable displacement. According to different working principles, air-conditioning compressors can be divided into fixed displacement compressors and variable displacement compressors.

 

The displacement of a fixed displacement compressor increases proportionally with the increase of the engine speed. It cannot automatically change the power output according to the demand for refrigeration, and it has a relatively large impact on the engine's fuel consumption. It is generally controlled by collecting the temperature signal of the air outlet of the evaporator. When the temperature reaches the set temperature, the electromagnetic clutch of the compressor is released and the compressor stops working. When the temperature rises, the electromagnetic clutch is engaged and the compressor starts to work. The fixed displacement compressor is also controlled by the pressure of the air conditioning system. When the pressure in the pipeline is too high, the compressor stops working.

 

The variable displacement compressor can automatically adjust the power output according to the set temperature. The air-conditioning control system does not collect the temperature signal of the air outlet of the evaporator, but controls the compression ratio of the compressor according to the change signal of the pressure in the air-conditioning pipeline to automatically adjust the air outlet temperature. In the whole process of refrigeration, the compressor is always working, and the adjustment of refrigeration intensity is completely controlled by the pressure regulating valve installed inside the compressor. When the pressure at the high-pressure end of the air-conditioning pipeline is too high, the pressure regulating valve shortens the piston stroke in the compressor to reduce the compression ratio, which will reduce the refrigeration intensity. When the pressure at the high-pressure side drops to a certain level and the pressure at the low-pressure side rises to a certain level, the pressure regulating valve increases the piston stroke to increase the intensity of refrigeration.

 

According to different working methods, compressors can generally be divided into reciprocating and rotary types. Common reciprocating compressors include crankshaft connecting rod type and axial piston type, and common rotary compressors include rotary vane type and scroll type. For specific details, please check the related articles.

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