Briefly describe the condition of high and low temperature test box not cooling
Shanghai Jianhu Instrument Equipment Co., Ltd. is a high-tech joint venture enterprise, specializing in the design, development, production, sales, and service reliability of environmental experiment equipment. Its main products are high and low temperature and humidity chambers, programmable constant temperature and humidity chambers, and it has entered the environmental laboratory- , WALKING-IN, salt spray box, constant temperature and humidity machine, hot and cold impact machine, vibration constant temperature and humidity compound testing machine, etc. Experienced and trusted and supported by many domestic and foreign manufacturers. The factory is set up in Shanghai, the network radiates to China, and customers are all over the world.
Since customers often encounter the situation that the high and low temperature test chambers are not cooling, you may wish to look at the following brief description:
1. Because the temperature cannot be maintained, observe whether the refrigeration compressor can be started during the operation of the test box and the compressor can be started during the operation of the environmental test equipment, indicating that the electrical circuit from the main power supply to each compressor is normal, and the electrical appliance There is no problem with the system.
2. There is no problem with the electrical system, continue to check the refrigeration system. First check that the exhaust and suction pressures of the low-temperature compressors of the two refrigeration units are lower than normal, and the suction pressure is evacuated, indicating that the main refrigeration unit has insufficient refrigerant quantity.
3. Touch the exhaust and suction lines of the compressor of the main unit by hand and find that the temperature of the exhaust line is not high and the temperature of the suction line is not low (no frost), which also shows the Refrigerant deficiency.
4. The cause of the failure is not determined, and the cause of the failure is further confirmed in combination with the control process of the test box. The test box has two sets of refrigeration units.
5. One group is the main unit and the other group is the auxiliary unit. When the cooling rate is large, the two groups work at the same time. At the beginning of the temperature maintenance stage, the two groups still work at the same time. After the temperature stabilizes initially, the auxiliary unit stops working, and the host group maintains the temperature stability. If the main unit leaks, the cooling effect of the main unit will be insignificant. Since the two units are working at the same time during the cooling process, there is no phenomenon that the temperature is not stable, and the cooling rate is indicated to decrease. In the temperature maintenance stage, once the auxiliary unit stops working and the main unit has no cooling effect, the air in the test chamber will slowly rise. When the temperature rises to a certain level, the control system will start the auxiliary unit to cool down and lower the temperature to the set point. Near the set value, and then the auxiliary unit stops working, so repeatedly, there will be a malfunction.
So far, it has been confirmed that the cause of the production failure is the refrigerant leakage of the low-temperature unit of the host group. The leak detection of the refrigeration system was carried out by a combination of leak detector and soapy water, and it was found that the stem of a hot gas bypass solenoid valve was cracked. Replace the solenoid valve, recharge the system with fluorine, and the system is operating normally.
The analysis and judgment of this fault phenomenon are basically easy to difficult. The analysis and judgment of the vein of the electric first, then the cooling first, then familiarize and understand the principle and working process of the test chamber is the basis for analyzing the fault judgment fault .
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