What is the reason why the rapid temperature change test chamber does not cool down
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yanyan Goblin Engineer   Posts: 23 Joined: May 2020 Reputation: 0 |
09 Nov 2021, 05:24
What is the reason why the rapid temperature change test chamber does not cool down?
Under the limitation of design strength, the rapid temperature change test box uses temperature acceleration technology to change the external environmental stress, so that thermal stress and strain are generated inside the product, and the potential defects of the product are revealed through the accelerated stress [potential part material defects, process defects, process defects] , To avoid the failure and unnecessary loss caused by environmental stress during the test during the use of the product, which has a significant effect on improving the delivery yield of the product and reducing the number of repairs. However, when using a rapid temperature change test chamber, sometimes there is no cooling. What caused this? What is the reason why the rapid temperature change test chamber does not cool down? Reason 1: 1. There is no problem with the electrical system of the rapid temperature change test chamber. Continue to check the refrigeration system. First, check whether the discharge and suction pressures of the low-temperature (R23) compressors of the two sets of refrigeration units are lower than the normal value, and whether the suction pressure is in the evacuated state, indicating that the main refrigeration unit is insufficient in the amount of refrigerant. 2. As the temperature cannot be maintained, during the operation of the test chamber, observe whether the refrigeration compressor of the rapid temperature change test chamber can be started, and whether the compressor can start when the environmental test equipment is running, indicating that the circuit from the main power supply to each compressor is normal , There is no problem with the electrical system. 3. Touching the exhaust and suction pipes of the R23 compressor in the main unit of the rapid temperature change test box by hand shows that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (no frost), which also indicates the lack of R23 refrigeration in the main unit Agent. Reason 2: 1. The cause of the failure of the rapid temperature change test box has not been determined. The cause of the failure is further confirmed in conjunction with the control process of the test box. The test box has two sets of refrigeration units. 2. One is the main unit and the other is the auxiliary unit. When the cooling rate is high, the two units work at the same time, and at the beginning of the heat preservation phase, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary machine stops working, and the main machine keeps the temperature stable. If the main engine R23 leaks, the cooling effect of the main engine will be very small, because in the cooling process; two units work at the same time, there is no unstable temperature situation, indicating that the cooling rate is reduced. In the heat preservation stage, once the auxiliary machine stops working, the main machine has no cooling effect, and the air in the test chamber will rise slowly. When the temperature rises to a certain level, the control system will start the auxiliary machine to cool down, and then the auxiliary machine will stop working again, and so on. UV Aging Test Chamber Ozone test chamber Horizontal Vertical Combustion Tester |
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vostov Riggedy-riggedy-rekt Warlock Posts: 1,147,462 Joined: Apr 2020 Reputation: 0 |
29 Jun 2023, 02:27
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vostov Riggedy-riggedy-rekt Warlock Posts: 1,147,462 Joined: Apr 2020 Reputation: 0 |
15 Feb 2024, 16:21
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