Air conditioning system refrigeration cycle bench testing method

Abstract

The invention relates to an air conditioning system refrigeration cycle bench testing method, which comprises the following steps of sample preparation, installation, pressure sensor calibration, evaporator temperature sensor calibration, TXV parameter measurement, filling amount test, refrigeration performance test and refrigeration cycle general operation test. The sample preparation comprises an air conditioning assembly with an evaporator inlet and outlet air temperature sensor, a compressor, a condenser with an inlet and outlet air temperature sensor, an air conditioning pipeline with a 3-way valve, expansion valves of different parameters and a certain amount of compressor oil. The installation environment is a bench with whole vehicle representativeness and wheels and a position near a bench testing environment. The operation states of the air conditioning system under different working conditions and the performance of the whole system can be timely, comprehensively and accurately known, system defects can be quickly recognized, quality improvement and performance improvement are quickened, the system development cycle is shortened, and the stability and the reliability ofthe system are enhanced.

Description

technical field [0001] The invention relates to the technical field of air-conditioning and refrigeration, in particular to a bench test method for refrigeration cycles of an air-conditioning system. Background technique [0002] Most of the existing bench test methods for the refrigeration cycle of automobile air-conditioning systems are formulated independently by each OEM or air-conditioning system manufacturer, and there is no uniform standard. Usually, there are more defects. [0003] The surface of the evaporator is icy. When the system simulates the working conditions incompletely, the whole vehicle will freeze under some driving conditions, and the air output of the air conditioner will gradually decrease until the system stops working, which will seriously affect the thermal comfort of the cabin; compression The machine is damaged. When the system freezes, the heat exchange capacity of the system decreases, and the liquid refrigerant in the evaporator cannot be com...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a bench test method for the refrigeration cycle of an air-conditioning system to solve the icing on the surface of the evaporator proposed in the above-mentioned background technology. When the system simulation conditions are not comprehensive, the whole vehicle will When icing occurs, the air output of the air conditioner gradually decreases until the system stops working, which seriously affects the thermal comfort of the cabin; if the compressor is damaged, when the system ices, the heat exchange capacity of the system decreases, and the liquid refrigerant in the evaporator cannot Complete evaporation, when the liquid refrigerant enters the compressor, it will cause liquid shock of the compressor, and then damage the compressor; the system stability is poor, and it is difficult to identify the fluctuation problem of the system when the verification of the system is not sufficient. When it is too large, it will cause fluctuations in the temperature of the outlet air, giving users a bad experience of hot and cold, and seriously causing icing on the surface of the evaporator; the verification cost of the whole vehicle is high, and more resources need to be invested in verification for a single working condition, and The vehicle verification is greatly affected by the environment. When the external working conditions are not satisfied, it is necessary to increase the test samples and extend the test cycle; data analysis is difficult. When there is no suitable bench verification method, the analysis of system problems needs to rely on a large number of The test data, coupled with the complex environmental factors of the vehicle, makes it difficult to guarantee consistency, which will increase the difficulty of data analysis and increase the time for problem solving

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