Seven major causes of high and low temperature test chamber compressor burnout

We all know that the compressor is the heart of the refrigeration system of environmental test equipment such as high and low temperature test chambers , and it is also the core component of the whole equipment. Its function is to maintain the circulation of the refrigerant in the refrigeration system by the input power, and to suck in the low temperature from the evaporator. The low-pressure refrigerant vapor compresses the refrigerant vapor to raise its temperature and pressure, and sends the refrigerant vapor to the condenser. In the process of heat absorption and release, heat exchange is realized. In the event of failure such as burning, the equipment It will be completely overhauled, which is an unacceptable fault for users. Therefore, both compressor manufacturers and test equipment manufacturers attach great importance to this.

So what are the reasons for the high and low temperature test chamber compressor burnout ? The following Anderson letter for you to analyze one by one:

First, the dynamic contactor fault contactor is easy to choose improperly or its quality is poor, resulting in excessive contact resistance or sintering, resulting in short-circuit sintering of the motor.

Second, the compressor starts frequently, although the voltage is started by the step-down, but the starting current is still several times of the rated current, so the temperature rises quickly during the starting process of the motor. If the cooling unit's cooling range is not properly selected, the control will exceed the compressor start-stop frequency range, causing the compressor to switch on and off frequently, which will shorten the service life of the compressor motor.

Third, the compressor itself has defects in manufacturing. Generally, the motor is burned in a short period of time, which may be a problem of manufacturing itself.

Fourth, the system is not clean enough. If there is water retention, it is an important problem for Zui. Water will cause poor motor insulation; moisture and refrigerant and refrigeration oil will circulate in the system, and will change after high temperature and low temperature. Acidic substances, in turn, can damage the insulation layer of the motor, causing poor motor insulation and burning the compressor for a long time.

5. The power supply voltage of the high and low temperature test chamber is unstable, and the quality of the power supply voltage is not good. If the voltage is too high or too low, it will have a bad influence on the compressor motor, especially if it exceeds the rated voltage range of the compressor, the use of zui is improper, and the long-term operation makes compression. The motor is in an inefficient overheating condition, resulting in poor insulation and motor burnout. In addition, the three-phase voltage or current imbalance will also cause motor loss (iron loss and copper loss) to increase, the compressor motor coil temperature is too high, the superheater is improperly protected, and the compressor motor insulation is burned.

6. The system is not cleaned after the compressor is burned. For systems that have had a compressor burnout failure, the system must be thoroughly cleaned. Because the compressor will burn out, there will be strong acid generated and resident in the system. If the treatment is not clean, when new After the compressor is running, residual acid will corrode the motor insulation, causing the new compressor to burn again.

7. The rotating parts of the compressor are stuck. When this happens, if the compressor protection action fails, it may be overloaded and burned. The compressor is stuck because there is foreign matter entering the compressor, the oil is not lubricated, the parts are loose, the body is overheated and sintered, and the bearing is worn.