The temperature and humidity box can not drop the temperature treatment method

The temperature and humidity box can not drop the temperature treatment method

No refrigeration temperature and humidity chamber, constant temperature and humidity box refrigeration failure, constant temperature and humidity test box cooling problems, constant temperature and humidity test chambers can not suddenly drop temperature, Humidity Chamber low temperature drop is less than the set value, constant temperature and humidity Cooling takes a long time. The constant temperature and humidity tester reduces the cooling time, and the high and low temperature constant temperature and humidity boxes cool slowly. The constant temperature and humidity box cannot reach the set temperature. These problems may confuse users. The following sections are used by Kevin to solve problems for you and hope to bring you benefits.

The treatment method of the temperature and humidity box refrigeration system fault :

Because it is unable to maintain the temperature, to observe whether the refrigerant compressor is able to start in the chamber during operation, the compressor can be started in the chamber during operation, to be described from a main supply line normal electrical compressors, electrical systems There is no problem. Next we have to check the refrigeration system. First of all, it is checked that the exhaust and suction pressures of low-temperature (R23) compressors of the two sets of refrigeration units are lower than normal values, and the suction pressure is in an empty state, which indicates that the amount of refrigerant in the main refrigeration units is insufficient. Touch the exhaust and suction piping of the R23 compressor of the main unit and found that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (unfrosted). This also explains the R23 of the host group. The lack of refrigerant, the system leaks refrigerant . To further understand the cause of the malfunction, the constant temperature and humidity chamber has two refrigeration units: one is the main unit and the other is an auxiliary unit. When the cooling rate is relatively high, the two units work at the same time. In the early stage of the temperature maintenance period, the two units still maintain Work at the same time.

According to the above, the Kewen constant temperature and humidity 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 relatively high, the two units work at the same time. In the early stage of the temperature maintenance period, the two The crew is still working at the same time. The next thing we will talk about is the analysis of the factors and phenomena of the failure of the two refrigeration units:

When the temperature is initially stabilized, the auxiliary unit stops working and the host group maintains the temperature stability. If the host group R23 is leaked, the cooling effect of the host group will be small. Since the two units work at the same time during the cooling process, there is no phenomenon that the temperature cannot be stabilized, and the indicated cooling rate decreases. In the temperature maintenance phase, once the auxiliary unit stops working, the main unit has no cooling effect, and the air in the test chamber will slowly rise. When the temperature rises to a certain extent, the control system will start the auxiliary unit to cool down the temperature and set the temperature down. In the vicinity of the fixed value (-55°C), the auxiliary unit will stop working again. If so, the fault phenomenon will occur. At this point, it was confirmed that the cause of the production failure was the leakage of refrigerant R23 of the low-temperature (R23)-class unit of the host group.

The leakage of the constant temperature and humidity chamber compressor and the refrigeration system was checked. A combination of a leak detector and soapy water was used to check and found that the valve stem of a hot gas bypass solenoid valve cracked approximately 1 cm. Replace the solenoid valve and recharge the system with refrigerant . The system is operating normally. Meanwhile, the above text view, analyze and judge the failure phenomenon is basically from easy to difficult, first outside Houli, after the first "electric", "cooling" in the context of the analysis and judgment, knowledge and understanding of chamber The principle and working process are the basis for analyzing faults to determine faults.

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