Ultra-low temperature refrigerators typically use secondary refrigeration. The first stage refrigerant is R-12 (23.0 oz, 1 oz = 28.349523 g), the design pressure is 400 ppsi (1 ppsi = 6.894476 X 103 Pa), and the low pressure is 90 ppsi. The second stage cooled condenser and the first stage cooled evaporator are placed together; the second stage refrigerant is a mixture of R-503 (8.5 oz) and R-290 (0.7 oz), designed high The low pressure is 300ppsi. The temperature probe is a thermistor, which displays different temperatures on the panel depending on the magnitude of the resistance (ie, the temperature). When the power is turned on, when the panel display temperature is higher than the set temperature, the first stage compressor starts first, and the first stage refrigeration system starts to work, so that the condenser temperature of the second stage refrigeration system drops, that is, the second stage The temperature of the refrigerant drops. After a few minutes delay, the second-stage refrigeration system also starts to work. Its evaporator is on the inner wall of the refrigerator, which can cause the internal temperature of the refrigerator to drop a lot. The heat emitted by its condenser is all the first. The evaporator of the stage refrigeration system absorbs, and the heat released by the first stage condenser is dispersed in the air. When the internal temperature of the ultra-low temperature refrigerator reaches the set temperature, the temperature sensing probe resistor transmits the information, the control relay loses power and is disconnected, and the two-stage refrigeration system stops working. When the temperature in the refrigerator rises again and exceeds the set temperature, the refrigerator repeats the above operation again, so that the temperature in the refrigerator is always maintained at the set temperature.
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