The high and low temperature test chamber is one of the climate simulation boxes. It is suitable for testing the temperature aging test of various products or tower core plastic parts and electrical and electronic products such as household appliances, instruments, instruments and components, in high temperature, low temperature and alternating environment. The adaptability test under the conditions can be used for testing by various scientific research institutions and the laboratory of the mine center. The following Shanghai Bao test introduces the maintenance of the three systems of high and low temperature testing machines. Components: The high and low temperature test chamber consists of a refrigeration system, a heating system, a control system, a temperature system air circulation system, and a sensor system. The above systems belong to two major aspects of electrical and mechanical refrigeration. 1. Heating system: Relative to the refrigeration system, it is relatively simple. It mainly consists of high-power electric resistance wire. Because the heating rate required by the test box is large, the heating system of the test box has relatively large power, and the bottom plate of the test box is also provided with a heater. 2. Control system: The core of the comprehensive test chamber, which determines the important parameters such as the heating rate and accuracy of the test chamber. Most of the controllers in the test box now use PID control, and a small number of control modes that combine PID and fuzzy control. Since the control system is basically in the category of software, and this part is in use, there is generally no problem. 3. Refrigeration system: one of the key parts of the comprehensive test chamber. In general, the cooling mode of the test chamber is mechanical refrigeration and auxiliary liquid nitrogen refrigeration. The mechanical refrigeration uses vapor compression refrigeration. They are mainly composed of compressor, condenser, throttling mechanism and evaporator. To achieve -55 ° C, single-stage refrigeration is difficult to meet the requirements, so the cooling method of the integrated test box generally uses cascade refrigeration.
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