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    Common faults and troubleshooting methods of refrigeration compressors

    Common faults and troubleshooting methods of refrigeration compressors The compressor is the "heart" of the refrigeration system. The compressor sucks low-temperature and low-pressure refrigerant gas from the suction pipe, drives the piston to compress it through the operation of the motor, and then discharges the high-temperature and high-pressure refrigerant gas to the exhaust pipe to provide power for the refrigeration cycle to realize the refrigeration cycle. The editor summarizes the common faults and troubleshooting methods of the compressor to help you better maintain the compressor. 1. The compressor suddenly stops during operation: Reasons are: (1) The suction pressure is too low, which is lower than the low-pressure lower limit of the pressure relay; (2) The exhaust pressure is too high, causing the high-voltage relay to operate and power off; (3) The oil pressure is too low, and the oil pressure relay acts to relay; (4) Motor overload, thermal relay action relay; elimination method: (1) Check the reason. If the pipeline is blocked, the pipeline must be unblocked. If the system has insufficient refrigerant, add it; (2) Check the cooling capacity or cooling air volume of the condenser; (3) Check the pipelines and pumps of the oil delivery system; (4) Check whether the power supply voltage is low or the cooling load is too large; 2. Exhaust gas compression is too high: Reasons are: (1) The cooling water volume of the water-cooled condenser is insufficient or the cooling air volume of the air-cooled condenser is insufficient; (2) The scale on the surface of the condenser tube cluster is too thick or the grease is too thick, which makes it difficult to dissipate heat; (3) There is air in the refrigeration system; (4) Excessive refrigerant injection; (5) The valve in the exhaust pipe fails, causing excessive pressure; elimination method: (1) Check whether the valve is fully open, increase the water supply or check the motor voltage, speed, and whether the transmission belt is too loose; (2) Wash the scale, scrub the oil, and clean the surface of the condenser tube cluster; (3) Let go of the air; (4) Discharge excess refrigerant; (5) Check and correct the valve; 3. The wet stroke of the compressor: Reasons are: (1) The thermal expansion valve fails and the opening degree is too large; (2) The solenoid valve fails, and a large amount of refrigerant enters the evaporative discharge pipe after shutdown, and enters the compressor when it is turned on again (3) Excessive amount of refrigerant injected into the system; (4) The thermal expansion valve's temperature-sensing package is loose and unbound, resulting in an increase in the degree of opening of the thermal expansion valve; elimination method: (1) Close the liquid supply valve and repair the thermal expansion valve; (2) Overhaul solenoid valve; (3) Release excess refrigerant; (4) Check the tying of the thermocouple; 4. The compressor is stuck: Reasons are: (1) There are dirty impurities in the lubricant; (2) The oil pipe of the oil pump is blocked, causing the cylinder to lack oil and the piston is stuck; (3) The shank pin of the main gear of the oil pump inserted into the crank is twisted, causing the oil system to cut off the oil elimination method: (1) Replace with new lubricating oil; (2) Repair the oil pump pipeline; (3) Overhaul and replace the main gear shaft of the oil pump; 5. Abnormal sound in the cylinder: Reasons are: (1) The dead space in the cylinder is too small; (2) The gap between the piston pin and the connecting rod size bush is too large; (3) The valve piece is broken; (4) The sound of oil strike caused by the crankshaft crank or the big end of connecting rod splashing oil; elimination method: (1) Adjust the thickened cylinder gasket; (2) Replace the piston pin or bushing; (3) Stop immediately and replace the valve disc; (4) There is no need to shut down in a short time, such as a shutdown inspection after a few minutes; 6. There is sound in the crankcase Reasons are: (1) The connecting rod nut is loose; (2) The clearance of the connecting rod big head bearing bush is too large; elimination method: (1) Stop and re-tighten; (2) Replace the tiles; 7. The compressor cannot start: Reasons are: (1) Poor contact and blowout of the power supply fuse; (2) Poor contact of the vertical contact point of the starter; (3) Temperature controller is out of adjustment or malfunctions; (4) The adjustment of the pressure relay is not suitable; elimination method: (1) Check the power supply and fuse; (2) Check the starter and wipe the contacts with gauze; (3) Check the temperature indication position, check each component; (4) Check the components or setting values ​​of the pressure relay; 8. Insufficient compressor cooling capacity: Reasons are: (1) The piston ring is worn or the gap between the piston and the cylinder is too large due to wear; elimination method: (1) Replace the new piston ring or repair and replace the new parts; 9. The compressor and motor coupling have noise: Reasons are: (1) Improper cooperation between compressor and motor coupling; (2) The key and keyway of the coupling are not properly matched; (3) The elastic ring of the coupling is loose or damaged; (4) The belt is too loose; (5) Loose fit between the inner hole of the coupling and the shaft; elimination method: (1) Reassemble according to the correct assembly requirements; (2) Coordinate the adjustment key with the key slot, and replace with a new one; (3) Fasten the elastic ring or replace it with a new one; (4) Adjust and tighten the belt; (5) Adjust and tighten the coupling;

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