Compressor protection measures against liquid strikes

Compressor protection measures against liquid strikes When too much liquid enters the cylinder and it is too late to discharge it from the exhaust valve, a liquid blow will occur in the cylinder. The high pressure generated during the liquid blow damages the cylinder, piston, connecting rod, etc., so it is necessary to take a Series of protective measures. 1. Fake cover Press the gas valve assembly against the end of the cylinder with a spring to form a false cover. When the pressure in the cylinder is too high, the exhaust valve is lifted up and the liquid is discharged, and the pressure in the cylinder quickly decreases. 2. Oil heater The lubricating oil in the crankcase dissolves refrigerant, and the dissolved amount increases when the ambient temperature is low. When the compressor starts, the pressure in the crankcase suddenly decreases, a large amount of refrigerant vaporizes, and the lubricating oil is foamy and is sucked into the cylinder, causing liquid shock. Using an oil heater to heat the lubricating oil before starting to reduce the amount of refrigerant dissolved in the lubricating oil is an effective measure to avoid liquid strikes. 3. Gas-liquid separator The gas-liquid separator shown is also called a liquid reservoir. The gas-liquid mixture from the evaporator is separated in the gas-liquid separator, and the gas enters from the upper part of the outlet pipe and flows out from the lower part. The separated liquid volume is stored at the bottom of the separator. The liquid refrigerant in it is heated and vaporized into the upper part of the outlet pipe. The lubricating oil that cannot be vaporized flows into the outlet pipe from the return hole and then enters the compressor.

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