First, understand some faults in high and low temperature test chambers , find solutions to the phenomenon! Backing Flanges,Backing Ring,Ring Flange, Backing Ring Flanges Shandong Zhongnuo Heavy Industry Co.,Ltd. , https://www.zhongnuoflange.com
Since the high and low temperature test chamber is a device consisting of multiple systems including electrical and refrigeration machinery, once the equipment has problems, it is necessary to comprehensively inspect and comprehensively analyze the entire equipment. Let's make a preliminary understanding of some faults in the high and low temperature test chambers to help you find a solution:
1) If the test chamber can be cooled, it can be explained that the external factor cooling water is eliminated. Let's check it further. 2) If the temperature is not maintained. At this time, it should be observed whether the refrigeration compressor can start normally during the operation of the test box, and the compressor can be started during the operation of the test box, indicating that the electrical circuit from the main power supply to each compressor is normal, and there is no problem in the electrical system of the test box. .
3) There is no problem with the electrical system and continue to check the refrigeration system. First, check the exhaust and suction pressure of the low-temperature (R23) compressors of the two groups of refrigeration units. If these two indicators are lower than the normal value, and the suction pressure is evacuated, the cooling capacity of the main refrigeration unit is insufficient. . Touch the exhaust and suction lines of the R23 compressor of the main unit by hand. If the temperature of the exhaust line is not high, the temperature of the suction line is not low (not frosted), which also explains the host group. R23 refrigerant is lacking and the system leaks fluorine.
4) The cause of the failure has not been determined, and the cause of the failure is further confirmed in conjunction with the control process of the test box, which has two sets of refrigeration units. One is the main unit and the other is the auxiliary unit. When the cooling rate is large, the two sets of units work at the same time. In the initial stage of the temperature maintenance stage, the two units still work at the same time. When the temperature is initially stabilized, the auxiliary unit stops working and the temperature is stabilized by the host group. If the host group R23 leaks, the cooling effect of the host group will be small. Because the two units work at the same time during the cooling process, there is no temperature stability, and the cooling rate is lowered. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test box will rise slowly. 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 setting. Near the fixed value (-55 °C), then the auxiliary unit stops working again. If it is repeated, the fault phenomenon as shown in 3 will appear. At this point, the cause of the production failure has been confirmed to be that the refrigerant R23 of the low temperature (R23) stage unit of the main unit leaks.
5) After the zui, we will check the refrigeration system. Check with the leak detector and soapy water. If there is a slight crack in the stem of a hot gas bypass solenoid valve, replace the solenoid valve and refill the system to make the system operate normally. As can be seen from the above, the analysis and judgment of the fault phenomenon is basically easy and difficult. First, the "outside" and "inside", first "electrical" and then "refrigeration" are analyzed and judged, familiar and Understanding the principle and working process of the test chamber is the basis for analyzing faults to determine faults.
The above "understand some of the failure phenomena of high and low temperature test chambers, find solutions to the phenomenon!" is the experience of our maintenance technicians in practice, helping everyone to understand the failure phenomenon of high and low temperature test chambers!