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Hydraulic stroke not only affects the normal operation of the compressor, but also causes specific hazards to different types of compressors:
Scroll compressor: Liquid strike will exert a huge impact force on the scroll disk, which may cause it to break. In addition, lubricants containing refrigerants are less viscous and do not form an effective oil film to protect moving parts from wear. At the same time, the boiling of the refrigerant in the lubricating oil will affect the lubrication effect and further aggravate the wear.
Screw compressors: Although screw compressors are more resistant to liquid strikes than other types, they can still cause vibration and noise increases due to liquid strikes, and even damage bearings and other important components.
Reciprocating compressors: The high pressure generated by the liquid strike can quickly destroy key components such as valve plates, pistons, connecting rods, and so on. For such compressors, the liquid strike is almost equivalent to a fatal blow.
Three, how to prevent liquid stroke
In order to prevent damage to the compressor caused by the hydraulic strike, it is necessary to take the following measures:
Reasonable control of refrigerant charge: Ensure that the refrigerant charge is within the recommended range of the compressor, and minimize unnecessary charge, especially at the low pressure side to avoid liquid charge.
Install a crankcase heater: By keeping the oil temperature in the crankcase higher than the intake temperature, the risk of refrigerant migration can be reduced, but this does not completely prevent damage to the compressor caused by the returned liquid refrigerant.
Gas-liquid separator: The gas-liquid separator installed on the suction pipe temporarily stores excess liquid refrigerant and returns it to the compressor at a safe speed, which is especially important for large refrigeration systems.
Application of return pipe superheating devices: in cold environments, the use of electric heaters or other means to increase the return temperature to ensure sufficient superheat to help prevent liquid refrigerant from entering the compressor.
Optimize the system design: improve the design of the throttling element and the heat transfer area of the evaporator from the source to increase the overheat of the return gas and reduce the possibility of liquid shock.
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