If the belt is good, check whether the tensioning axle is poorly lubricated. Appropriate amount of lubricant should be added. If the lubricant surface of the compressor is too low, it should be added in an appropriate amount to reach the inspection line. Use qualified lubricants to reduce wear and tear. If the internal parts of the compressor are loose, repair or replace them. Although the system was depressurized while driving, theoretically, the pipeline was saturated with propane gas-liquid two phases, but due to the good cold preservation of the low temperature pipeline, the propane liquid could not be rapidly vaporized. After the cold layer of the U-shaped pipe section is removed, the hot water is used to warm the pipeline, and the pressure in the system rises rapidly. It can be said that there is still a large amount of liquid propane in the pipeline, and the frost at the inlet can be confirmed to be compressed after the compressor is stopped. The machine enters a large amount of liquid.
Since the liquid is an incompressible fluid, each user should pay sufficient attention to the possibility that the screw compressor may enter a large amount of liquid and cause a major accident of the compressor. When a continuous "click" sound occurs at the compressor inlet and the compressor current increases, a small amount of liquid enters the compressor. In operation, the system and compressor are checked before the driving according to the operating procedures. The lubricating oil is heated at 50 ° C for at least 24 h to reduce the dissolved propane gas in the lubricating oil. In order to avoid liquid entering the compressor, the following measures can be taken: (1) remove a part of the cold layer at the U-tube before driving, heat the pipe section to ensure no liquid enters the compressor; or after the compressor is shut down, the system is Cut off and depressurize the gas in the pipeline to normal pressure. (2) Modify the process line to eliminate the U-tube and return the liquid to the propane tank. (3) Adding a gas-liquid separator at the inlet of the compressor and the middle gas injection port can completely solve the problem of liquid entering the compressor.
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