The high and low temperature test chamber 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 groups The units are working at the same time. At the beginning of the temperature maintenance phase, the two units still work at the same time. Then what we are going to talk about is the two systems Analysis of the factors and phenomena of chiller failure: It will make the cooling effect of the host group less, because during the cooling process, the two units work at the same time, so there is no phenomenon that the temperature cannot be stabilized. The cooling rate is reduced. During the temperature maintenance phase, once the auxiliary unit stops working and the main unit has no cooling effect, the air in the test chamber will Slow rise, when the temperature rises to a certain level, the control system will start the auxiliary unit to cool down, and the temperature will drop to the set value (-55 ℃ ) Nearby, and then the auxiliary unit stops working again, and so repeatedly, the fault phenomenon shown in Figure 3 will appear. So far, the production has been confirmed The cause of the failure is leakage of refrigerant R23 of the low-temperature (R23) class unit of the main unit. The valve stem had a slit of about 1 cm. Replace the solenoid valve, recharge the system with fluorine, and the system is operating normally. At the same time, as seen above, yes The analysis and judgment of the fault phenomenon is basically easy to difficult, first "outer" then "in", first "electrical" then "refrigeration" Analysis and judgment, familiar with and understand the principle and working process of the test chamber is the basis for analyzing the failure to judge the failure. Table Series,Solid Wood Dining Room Furniture,Customized Kitchen Table,Wooden Round Dining Table Hebei Rukai Furniture Co. , Ltd. , https://www.rukaifurniture.com
After the temperature stabilizes initially, the auxiliary unit stops working, and the host group maintains the temperature stability. If the host group R23 is leaked,
Check the leakage of the refrigeration system of the high and low temperature test chamber, and use a combination of leak detector and soapy water to find a hot gas bypass electromagnetic