Basic principles of high and low temperature test chambers

August 31, 2022

The test chamber refers to a test chamber capable of simultaneously applying temperature and humidity stress. Due to the complexity of the test box itself, many problems have appeared in the operation of the test box, and problems have not been solved in time, which greatly prolonged the test cycle and affected the development of the product. The reason for these phenomena is that they do not understand the working principle of the integrated test chamber. Therefore, we have made some brief explanations on the basic working principle of the test box, and how to analyze and judge the failure of the test equipment of the comprehensive test chamber. As long as the test chamber consists of a refrigeration system, a heating system, a control system, a humidity system, an air circulation system, and a sensor system, the refrigeration cycle is reversed, and the cycle consists of two isothermal processes and two adiabatic processes. The process is as follows: :

*, the refrigerant is adiabatically compressed to a higher pressure by the compressor, and the consumed power causes the exhaust gas temperature to rise.

Second, the refrigerant is heat-exchanged with the ambient medium and the surrounding medium through the condenser. After the heat is transferred to the surrounding medium, the refrigerant is adiabatically expanded by the shut-off valve, and the temperature of the refrigerant is lowered.

Third, after the Zui, the refrigerant absorbs heat from the higher temperature object isothermally through the evaporator, so that the temperature of the object to be cooled is lowered. This cycle is repeated to achieve the purpose of cooling. The design of the refrigeration system uses energy-adjusting technology to ensure the normal operation of the refrigeration test unit, and to effectively adjust the energy consumption and cooling capacity of the refrigeration system, so that the refrigeration system maintains a good operating state. dynamic equilibrium.

High and low temperature test chamber maintenance method: Check the refrigeration system of the high and low temperature test chamber, and use the leak detector and soapy water to check where the leak is. If it is found that the valve stem of the hot gas bypass solenoid valve is cracked. If there is a slit, replace the solenoid valve. If any other places are found to leak, repair the leak at the leak with oxygen welding, and then refill the system to restore the system.

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