The common causes of oil shortage and damage of scroll refrigeration compressors mainly include the following aspects:
Oil-defied operation: When the compressor is running, if the lubricating oil** is insufficient or interrupted, it will cause the internal parts of the compressor to run without oil. Long-term operation without oil will lead to abnormal wear of internal parts, vibration and noise, and in severe cases, the compressor may burn out. The causes of oil shortage may include insufficient oil return to the system, frequent start and stop of the compressor, improper design of compressor piping, improper design of the compressor system, etc.
Excessive moisture: If the vacuum of the refrigeration system is not enough or the moisture content of the refrigerant exceeds the standard, the moisture will react with the lubricating oil, resulting in the deterioration of the lubricating oil and the loss of lubrication. This can lead to rust and copper plating on the internal parts of the compressor, resulting in less clearance and increased friction, which can damage the compressor.
Excessive impurities: Excessive oxide scale or dust and dirt in the system pipelines generated during system installation, as well as insufficient oil return or lubrication of the system, may lead to abnormal wear of the internal parts of the compressor. In addition, the high-speed operation of the rotor can also introduce impurities into the compressor, which can increase the wear and tear of the components.
Motor damage: Motor damage is mainly manifested as damage (short circuit) and open circuit of stator winding insulation. This may be caused by a short circuit caused by a scratch of the coil due to excessive system impurities, a short circuit caused by paint damage during the coil manufacturing process, or a rapid aging and burning of the coil due to overload use.
Poor operating environment: The operating environment of the system is poor, such as blocked air ducts, poor return air, dirty heat exchangers, etc., which will lead to high condensation pressure and continuous rise in exhaust temperature, which will damage the compressor.
To prevent damage to the scroll refrigeration compressor, the following measures can be taken:
Regularly inspect and maintain the compressor, including checking oil levels, cleaning the system, replacing worn parts, etc.
During installation and operation, the content of moisture and impurities is strictly controlled to avoid damage to the compressor.
Optimize the operating environment of the compressor to ensure that the air duct is smooth, the return air is good, and the heat exchanger is clean, etc., so as to reduce the exhaust temperature and pressure.
Choose the appropriate lubricating oil for the scroll compressor, and regularly check the oil level and oil quality to ensure the normal quality of the lubricating oil.
Avoid frequent start-stop and stop of scroll compressors to reduce shock and wear on the compressor.
In short, there are many reasons for oil shortage and damage of scroll refrigeration compressors, and it is necessary to consider various factors and take corresponding precautions to ensure the stable operation of the compressor and prolong its service life.