Common compressor failure Motor burned down Motor damage - Causes of motor burnout caused by short circuit or open circuit: ( 1 ) abnormal load and blockage; ( 2 ) winding short circuit caused by metal chips; ( 3 ) the issue of the initiator; ( 4 ) The voltage is abnormal; ( 5 ) insufficient cooling; ( 6 ) vacuuming with a compressor ; ( 7 ) The compressor is operated under vacuum. Reasons for loud noise and its judgment Noise indicators are difficult to judge, and each person's sensitivity to noise is different. The compressor itself causes significant noise due to improper assembly, spring removal and the like. In the refrigerator system, the flow pulse of the refrigerant and the vibration of the compressor transmitted by the pipeline may also cause local resonance and generate noise. At this time, the resonance point can be avoided by adjusting the pipeline and attaching a heavy object to the pipeline. Judging whether the compressor is too high or not can compare the sound of the removed compressor with a normal compressor (including no-load and pressure operation). If there is no obvious difference, it can be judged that the noise is normal. Oil drain failure Because the refrigerant has excellent compatibility with the refrigeration oil, it is normal for a part of the refrigeration oil to participate in the circulation of the system, and will not affect the refrigeration performance of the refrigerator. However, too much oil will affect the heat exchange efficiency on the heat exchanger tube wall, resulting in poor refrigeration performance of the refrigerator. The reasons for the compressor discharge are: a . If the gap between the piston of the compressor and the cylinder bore is too large or the roundness is poor, the oil enters the exhaust circuit too much. b . When the compressor is dumped, the oil enters the suction chamber. When the compressor is running, the system pipeline enters the excess refrigeration oil, resulting in poor cooling. Removing the compressor at this time will reflect more oil in the pipeline and may misjudge the compressor to drain more oil. In this case, the compressor can be energized and the oil discharge is gradually reduced. If this is the case, the compressor itself will not drain much. c . If there is a part of the refrigerator pipeline that is lower than the compressor return pipe, a small amount of refrigeration oil in the pipeline will accumulate when the compressor stops rotating. As a result, the more the result, the more oil is blocked, and the compression is removed during maintenance. When the machine is in operation, it will show a lot of oil, which may lead to misjudgment as the compressor discharges oil. Factors that can easily cause compressor failure 1. Influence of moisture: If the water content of the refrigerator system or the compressor itself is too high, the compressor refrigeration oil will gradually decompose and deteriorate, and the decomposed substances will deposit on the valve block, resulting in poor exhaust gas. In addition, it may cause malfunctions such as capillary ice plugging. Judging whether the frozen oil has deteriorated can be judged by observing the color of the oil. Generally, the deteriorated oil is darker in color, dark yellow or brown, while the undeteriorated oil is clear and transparent, light yellow or light blue. 2. Effect of refrigerant charge: Excessive refrigerant charge will have the following consequences: ( 1 ) The compatibility between the refrigeration oil and the refrigerant in the compressor is very good. After the refrigerant is charged, a part of the refrigerant will be dissolved in the refrigeration oil. When the compressor starts, the internal pressure of the casing is reduced, resulting in the refrigerant dissolved in the refrigeration oil. Escape, causing a temporary boiling phenomenon, such as charging too much refrigerant will increase the boiling phenomenon, causing the suction pipe to take in the gas-liquid mixture, causing the suction valve to open too much and the force of hitting the valve seat is too large Damage to the suction valve. ( 2 ) The compressor is designed according to the equilibrium pressure of the standard working conditions. Excessive refrigerant charging will make the equilibrium pressure on the suction and exhaust side too large, resulting in high compressor load or normal starting. Long-term overload operation will accelerate compressor damage. 3 , the impact of the compressor use environment: ( 1 ) The design temperature of the compressor is 32 °C, which can adapt to short-term high temperature environment above 38 °C. If the space where the refrigerator is placed is small and the air flow is not smooth, coupled with the hot summer, the condenser and the compressor will not dissipate well. If the local ambient temperature is too high (more than 45 °C), the refrigerator will be cooled. Poor, the compressor is working at full load under such harsh conditions for a long time, the temperature rise of the motor windings and valve block is too high, and it is easily damaged. ( 2 ) Excessively high ambient temperature of the compressor will also cause an increase in the equilibrium pressure, resulting in difficulty in starting. 4 , the impact of the compressor dump: the compressor or refrigerator dumped to the suction pipe side or the cylinder head side, the refrigeration oil in the compressor will enter the device, if not properly placed for a period of time to allow the oil to flow out and immediately energized, then The compressor is extremely easy to inhale liquid oil and damage the valve plate, which we call liquid hammer. It may also cause too much oil entering the system piping, causing a malfunction of poor cooling. 5 , other factors: ( 1 ) The vibration shock during the transportation of the compressor and the refrigerator is too severe or overturned, which may damage the internal parts of the compressor and cause malfunction. ( 2 ) Excessive exposure to air after the compressor plug is removed can cause moisture to enter, especially in wet weather. ( 3 ) Starting the refrigerator immediately after the refrigerant has not stabilized for a period of time, causing the suction pipe in the compressor to inhale the liquid refrigerant that has not been vaporized to cause damage to the valve block (mainly the suction valve piece). ( 4 ) Failure to meet the requirements of the two devices will also cause damage to the compressor : the starter and protector used in each compressor have specified parameters. For example , the resistance value of the PTC starter will affect the starting performance of the compressor; The protector protects the compressor by the allowable temperature rise and current. If the parameter is low or high, the compressor protector will frequently operate, resulting in the compressor not working properly or during overload (such as ice block, compressor). Overheating) Loss of protection and damage to the compressor. common enquiries Do not remove the rubber plug before installing the compressor to prevent dirt and moisture from entering. The compressor should not be tilted or inverted when stored, transported or installed, while avoiding impact. The compressor is tilted no more than 5 ° from the horizontal state during operation . Appropriate amount of special refrigerating oil is approved in the compressor and should not be poured or added at will. In order to ensure the system pressure balance, the compressor running interval should not be less than 4 minutes. The compressor cannot withstand high voltage or start and operate under vacuum conditions. The compressor cannot be used for system vacuuming. The refrigeration system should be designed with full consideration of the system's oil return. The operating temperature of the compressor must not exceed 43 °C. For continuous operation at ambient temperature ( 43 °C), the condensing pressure and peak pressure should not exceed the following values: The refrigerant R600a, R134a, R404A, R22, R22 / R152a condensing pressures of 0.87, 1.59, 2.63, 2.37, 1.45MPa, the condensing pressure peaks are 0.98, 2.00, 3.00, 2.63, 1.82MPa, the evaporation temperature of the compressor using It should not be arbitrarily increased within the scope of the license. The compressor should be stored in a dry place. The compressor has been subjected to high voltage withstand voltage test before leaving the factory, and the compressor can not be tested for high voltage. The inventory period after the compressor is shipped from the factory should not exceed 6 months. If it is more than 6 months, please check if the gas in the compressor is sufficient. If necessary, add nitrogen or dry air. Shanghai Sujing Industrial Co., Ltd. If you have any needs, you can always pass with me, thank you very much for your support to Sujing, look forward to working with you. have a pleasant workday! Thankyou&Bestregard! SUJING—JINGHUA
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