The cold and hot shock test box, also known as the three-box cold and hot shock test box, is mainly composed of a low-temperature storage room, a high-temperature storage room and an impact temperature test room. Knowing the working principles of the three chambers plays a vital role in how to operate scientifically and protect them reasonably. Qinzhuo Environmental Testing Technology has made technical announcements on the working principles of the three chambers, which has been prepared for users' reference.
(1) High-temperature storage room: the central controller detects the real-time signal from the temperature-sensing element and compares it with the set temperature signal to obtain a comparison signal. The PID logic circuit output signal of the instrument controls the time ratio of the solid-state relay on or off Adjust the output power of the heater to achieve the purpose of automatic temperature control.
(2) Low-temperature storage room: The temperature state in the box is determined by the working state of the heater, evaporator and fan in the air duct. After the refrigerant flowing out of the expansion valve enters the evaporator in the working chamber, it absorbs the heat in the working chamber and vaporizes it, thereby lowering the temperature of the working room; the vaporized working medium is sucked by the compressor and compressed into high-temperature, high-pressure gas into the condenser The liquid is condensed into liquid, then passes through the screening program, and finally throttled by the expansion valve, and then enters the evaporator in the working chamber again to absorb heat and vaporize, and then is sucked and compressed by the compressor. Working back and forth in this way, the studio temperature drops to the set temperature requirement
(3) Impact temperature test room: the instrument automatically controls the high and low temperature gas valves, switches between the low temperature and high temperature storage rooms, and forms a closed-circuit air circulation system with the high temperature box or low temperature box, respectively, to quickly reach the target temperature of the test. The temperature state in the test chamber is determined by the working state of the heater, evaporator, and fan in the air duct. The chamber of the test chamber adopts forced axial flow "dispersion" type loop wind work, which can greatly improve the parameters such as fluctuation and uniformity of equipment operation.
After mastering the working principles and functions of the three chambers of the hot and cold shock test box, it is of great help to how to effectively control the equipment and effectively improve the test effect of the hot and cold shock test box. If you encounter greater technical difficulties, please Consult Qinzhuo Environmental Testing Technology Department, our company will provide you with a set of effective cold and hot shock test program.
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