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Location:Home > news > Common problems - Common troubleshooting methods for refrigeration compressors

Common troubleshooting methods for refrigeration compressors
Release time:2018-6-8 11:16:47      Number of clicks:252
1. The compressor stops suddenly in operation:
1. Causes the compressor to stop suddenly in operation include:
(1) the suction pressure is too low, lower than the low pressure lower limit of the pressure relay;
(2) high exhaust pressure causes power failure of high-voltage relay;
(3) low oil pressure, oil pressure relay operation relay;
(4) motor overload, thermal relay operation relay;
2. Elimination of sudden stop of compressor during operation:
(1) the reason for inspection shall be unimpeded if the pipe is blocked, if the system refrigerant is insufficient, it shall be supplemented;
(2) check the cooling capacity or cooling air volume of the condenser;
(3) inspection of pipeline and oil pump of oil transportation system;
(4) check whether the power supply voltage is low or the cooling load is too large;
Excessive exhaust compression
1. Causes of excessive exhaust compression include:
(1) the cooling water of the water-cooled condenser is insufficient or the cooling air of the air-cooled condenser is insufficient;
(2) excessive scale or oil pollution on the surface of condenser tubules leads to difficulty in heat dissipation;
(3) air in the refrigeration system;
(4) excessive infusion of refrigerant;
(5) the valve in the exhaust pipe fails, causing excessive pressure;
2. Elimination of excessive exhaust compression:
(1) check whether the non-valve is fully open, increase water supply or check whether the motor voltage, speed and transmission belt are too loose;
(2) clean the scale, scrub the oil, and make the surface of condenser tubules clean;
(3) release air;
(4) to expel excess refrigerants;
(5) check the correction valve;
The wet stroke of the compressor
1. Wet stroke of the compressor is caused by:
(1) the thermal expansion valve fails and is opened too large;
(2) the solenoid valve fails. After the stop, a large number of refrigerants enter the evaporative discharge pipe and enter the compressor when the machine is started again.
(3) excessive dose of system perfusion refrigeration;
(4) the sensible temperature package of thermal expansion valve is loose and unbound, causing the opening degree of thermal expansion valve to increase;
2. Elimination method of wet stroke of compressor:
(1) close the feed valve and repair the thermal expansion valve;
(2) overhaul electromagnetic valve;
(3) release excess refrigerant;
(4) check the binding condition of the temperature sensitive bag;
The compressor is stuck
1. The reasons why the compressor is stuck include:
(1) there are dirty and impurities in the lubricating oil;
(2) the oil pipeline of the oil pump is blocked, causing the cylinder to die of oil shortage piston;
(3) when the main gear of the oil pump is inserted into the crank, the handle pin is twisted, causing the oil system to break off;
2. Elimination of compressor sticking:
(1) replace new lubricating oil;
(2) maintenance of oil pump pipeline;
(3) overhaul and replace the main gear shaft of the oil pump;
There is a different sound in the cylinder
1. Reasons for the abnormal sound in the cylinder include:
(1) the dead point clearance in the cylinder is too small;
(2) excessive clearance between piston pin and connecting rod liner;
(3) disc fracture;
(4) oil percussion generated by crankshaft bending or large head of connecting rod splashing oil;
There is a noise in the cylinder
(1) adjust the thickened cylinder liner;
(2) replace piston pin or bushing;
(3) stop immediately and replace the valve disc;
(4) there is no need to stop for a short period of time, such as stopping for inspection after several minutes;
Sound in crankcase
1. Reasons for sound in crankcase include:
(1) the connecting rod nut is loose;
(2) large clearance of connecting rod head bearing bush;
2. Sound elimination method in crankcase:
(1) stop and retighten;
(2) replace tiles;
The compressor won't start
1. The reasons why the compressor cannot start are as follows:
(1) bad contact and burning of fuse of power failure;
(2) poor vertical contact of the starter;
(3) the temperature controller is maladjusted or fails;
(4) improper setting of pressure relay;
2. Troubleshooting method of compressor failure to start:
(1) check the power supply and fuse;
(2) check the starter and wipe the contact point with gauze;
(3) check the temperature indicating position and check the components;
(4) check each component or set value of the pressure relay;
8. Insufficient cooling capacity of the compressor
1. The reasons for the insufficient refrigerating capacity of the compressor are as follows:
(1) piston ring wear or the clearance between piston and cylinder is too large due to wear;
2. Elimination of insufficient refrigerating capacity of compressor:
(1) replace new piston rings or repair and replace new parts;
Compressor and motor coupling have noise
1. Causes of noise in compressor and motor coupling include:
(1) improper coordination between compressor and motor coupling;
(2) improper key and keyway coordination of the coupling;
(3) the elastic ring of the coupling is loose or damaged;
(4) the belt is too loose;
(5) loose coupling between internal hole and shaft;
2. Noise elimination method of compressor and motor coupling
(1) reassemble according to correct assembly requirements;
(2) adjust key and keyway, change new key;
(3) tighten the elastic ring or replace it;
(4) adjust and tighten the belt;
(5) adjust and tighten the coupling.
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