Trouble analysis and elimination of piston refrigeration compressor

Trouble analysis and elimination of piston refrigeration compressor Trouble analysis and elimination of piston refrigeration compressor 1) Large oil consumption of compressor 　　 Reason: The gap between the bearing, oil ring, cylinder and piston is too large, which increases the amount of oil run. 　　Exclude: Carry out corresponding maintenance or replace parts. 2) The bearing temperature is too high 　　 Reasons: dirty oil, blocked oil passage; insufficient oil supply; clearance is too small; bearing wear or bearing bushing. 　　Exclude: clean the oil circuit and change the lubricating oil; fully supply the oil; adjust the clearance; repair the bearing bush. 3) Failure of energy regulation mechanism 　　 Reasons: The oil pressure is not enough; the oil contains refrigerant liquid; the oil outlet valve of the regulating mechanism is dirty and blocked. 　　 Elimination: Find the cause of low oil pressure and adjust the oil pressure; preheat the oil in the crankcase longer; clean the oil circuit and oil valve to make the oil circuit smooth. 4) The suction temperature is too high 　　 Reasons: Insufficient refrigerant or leakage; insufficient refrigerant in the evaporator; too small expansion valve opening. 　　 Elimination: Leak detection (grease marks at the connection and welds) and elimination of leaks, supplement refrigerant; adjust the amount of liquid supply; increase the opening of the valve to make the suction temperature 10 ~ 15 ℃ higher than the evaporation temperature. 5) Inspiratory pressure is too high 　　 Reasons: excessive refrigerant; excessive heat load; improper opening of expansion valve; inadequate installation of temperature sensor; reduction of compressor displacement; oil return failure of oil separator. 　　 Elimination: release excess refrigerant; adjust the load; adjust the opening of the valve; re-bundle the temperature sensor; check the exhaust valve and repair or replace it; check and repair the automatic oil return or temporarily use manual oil return. 6) Inspiratory pressure is too low Reasons: Insufficient refrigerant; ice plug; too thick frost on the evaporator} dirty plug or too much oil; the opening of the expansion valve is too small; the temperature sensor leaks; the opening of the valve and the outlet valve on the oil supply pipe is small; electromagnetic Valve failure; filter clogged. Exclude: charge refrigerant to meet the requirements; change the drying filter to remove the water in the system; defrost should be performed regularly; clean and decontaminate or drain the oil; adjust the opening of the expansion valve; replace the thermal expansion valve; Open the valve; repair or replace the solenoid valve; remove and clean the filter. 7) The exhaust temperature is too high 　　 Reasons: large load; large clearance volume; exhaust valve disc and gasket damaged and blow-by gas; large suction superheat; bad cylinder cooling. 　　Exclude: reduce the load; adjust the clearance with cylinder gasket; replace the threshold plate or gasket after inspection; increase the amount of excess liquid; increase the amount of cooling water. 8) The exhaust temperature is too low 　　 Reasons: The compressor sucks liquid; the expansion valve supplies too much liquid; the cooling load is insufficient; the evaporator frost is too thick. 　　Exclude: reduce the opening of the suction valve; adjust the supply of liquid to make the superheat of the return air at 5～10℃; adjust the load; sweep or frost regularly. 9) The exhaust pressure is too high Reason: Mainly a condenser problem, such as the presence of non-condensable gas in the system; water valve δ opening or opening is not large, water pressure is too low to cause insufficient water volume or water temperature is too high; air-cooled condenser fan δ opening or air volume Insufficient; too much refrigerant charge (when there is no reservoir); too much dirt in the condenser; compressor exhaust valve δ opened to the maximum} exhaust pipe is not smooth. 　　Exclude: deflate at the high-pressure exhaust end; open the water valve to increase the water pressure; turn on the fan to reduce the air resistance; eliminate excess refrigerant; clean the condenser, pay attention to the water quality; open the large exhaust valve; and clear the exhaust pipe. 10) The exhaust pressure is too low 　　 Reasons: Insufficient refrigerant or leakage; exhaust valve leakage; excessive cooling water volume, low water temperature, improper energy adjustment. 　　 Elimination: leak detection and elimination of leakage points, supplement refrigerant; repair or replace valve disc; reduce cooling water volume; repair energy adjustment device. 11) Wet compression (liquid impact) 　　 Cause: The liquid level of the evaporator is too high; the load is too large; the suction valve opens too fast. 　　Exclude: adjust the liquid supply valve; adjust the load (adjust the energy adjustment device); the suction valve should be opened slowly, and the liquid shock should be closed. 12) The oil pressure is too high 　　 Reasons: Improper adjustment of oil pressure; poor oil pipe; inaccurate oil pressure gauge. 　　 Exclude: readjust the hydraulic valve (relax the spring); check and clean the oil pipe; replace the pressure gauge. 13) Oil pressure is too low 　　 Reasons: insufficient oil quantity; improper adjustment; clogged oil filter or clogged oil inlet; worn oil pump; (evaporator) vacuum operation. 　　Exclude: add oil volume; adjust oil pressure regulating valve} remove and clean to remove blockage; repair oil pump; adjust operation to make crankcase pressure higher than atmospheric pressure. 14) Oil temperature is too high 　　 Reasons: exhaust temperature is too high; oil cooling is not good; assembly gap is too small. 　　 Elimination: Solve the reason of high exhaust pressure; increase the amount of cooling water; adjust the gap. 15) Motor overheating 　　 Reasons: low voltage, resulting in large current; poor lubrication; overload operation; non-condensable gas in the system; electric winding insulation damage. 　　 Elimination: Check the cause of low voltage and eliminate it; check the lubrication system and give it a solution; reduce load operation; discharge non-condensable gas; check or replace the motor.

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