Aisi thinks about the working principle of high and low temperature test chamber

Ai Siwei () has been particularly interested in environmental testing equipment in the instrumentation industry for more than two decades. About the high and low temperature test chamber, Aisin Technologies explains its working principle:
The high and low temperature test chamber is mainly composed of a refrigeration system, a heating system, a control system, a temperature system air circulation system, and a sensing system according to a comprehensive tester. The above system is divided into two major aspects of electrical and mechanical refrigeration to complete the operation of the equipment. The high and low temperature test chamber is a tester that can simultaneously apply temperature and temperature stress. With the development of China's industrial products, in recent years, China has introduced a large number of test systems from abroad. The refrigeration system is one of the key parts of the integrated tester. In general, the cooling method of high and low temperature tester is mechanical refrigeration to assist liquid nitrogen refrigeration, and mechanical refrigeration uses vapor compression refrigeration. They are mainly composed of compressor, condenser, throttling mechanism and evaporator.
If the test temperature in the high and low temperature test chamber is -55 degrees, the single-stage refrigeration is difficult to meet the requirements. Therefore, the general tester's refrigeration method generally uses cascade refrigeration. Normally, high and low temperature test chambers will have uniformity, and the uniformity within the national standard is ±2°C. Then what is the guarantee? The answer is: wind circulation. The principle of wind circulation blast is: the wind is generated by the motor to generate wind, which is sent to each corner of the box through the vertical delivery method. The temperature of each point is guaranteed to be balanced. Thus, the environment of each tested product under pressure is the same and the product test results are very accurate.
Another point is that the temperature balance of the high and low temperature chambers has a certain relationship with the cooling system and the temperature point. There is a test product whether there is heat, size and shape, if the parts are small and there is no heat, then the temperature balance is very good protection, if the parts are large and there is a lot of heat, then the temperature deviation Relatively speaking, it is more difficult to protect it.
Aisihao Detection Instrument Co., Ltd. main products are: ultraviolet aging test chamber, rain test chamber, temperature and humidity three comprehensive test system, xenon lamp aging test chamber, vibration test bench, acceleration impact testing machine, drop test bench, carton compression Test Machine, High Pressure Accelerated Aging Test Chamber PCT, Aging Test Chamber, Constant Temperature and Humidity Test Chamber, High and Low Temperature Humidity Test Chamber, Salt Spray Test Machine, Thermal Shock Test Chamber, Compound Salt Spray Test Machine, HAST Unsaturated Test Apparatus, Dust resistant test box and so on. Related equipment and equipment technical knowledge can be consulted Ai Sihao technical department hotline Website: