Here is a simple classification of common compressor faults:

 

1.The compressor cannot start and run normally:

1)The power supply voltage is too low; Poor motor line contact;

2)Exhaust valve plate leakage.  the crankcase pressure is too high;

3)Failure of energy regulating mechanism;

4)The temperature controller is maladjusted or faulty;

5)The pressure relay fails.

 

2.Compressor starts and stops frequently:

1)Due to the leakage of the exhaust valve plate, the pressure is balanced, resulting in too high intake pressure;

2)The amplitude difference of temperature relay is too small;

3)Due to the high pressure caused by the shortage of water in the condenser, the high voltage relay operates.

 

3.There is no oil pressure after the compressor is started or the oil pressure cannot be met during operation:

1)Oil leakage or pipeline blockage at the connection of oil pump pipeline system;

2)The oil pressure regulating valve is opened too large or the spool falls off;

3)crankcase oil is too little;

4)There is ammonia liquid in the crankcase, and the oil pump does not enter the oil;

5)The oil pump is severely worn and the clearance is too large;

6)the connecting rod bearing bush and crankshaft pin, connecting rod small head bushing and piston pin wear seriously;

7)The oil pressure gauge valve is not open.

 

4.Oil pressure is too high

1)The oil pressure regulating valve is not opened or opened too small;

2)Internal blockage of the oil circuit system;

3)oil pressure regulating valve spool stuck.

 

5.The oil pump is not pressurized

1)The oil pump parts are severely worn, resulting in excessive clearance;

2)The oil pressure gauge is inaccurate and the pointer is out of order;

3)Improper assembly of oil pump parts after inspection.

 

6.Lubricant foam in crankcase

1)The lubricating oil contains a large amount of ammonia liquid, and foam is caused by evaporation of ammonia liquid when the pressure decreases;

2)Crankcase oil is too much, the connecting rod big pull lubricating oil caused.

 

7.The oil temperature is too high

1)There is no water supply for the crankcase cooler;

2)Improper assembly of shaft and tile, too small clearance;

3)The lubricating oil contains impurities, resulting in bearing wool;

4)Installation of shaft seal friction ring is too tight or friction ring pulling;

5)The suction and exhaust temperature is too high.

 

8.Unstable oil pressure

1)The oil pump absorbs the oil with foam;

2)The oil circuit is not smooth

 

9.The compressor consumes too much oil

1)The oil ring is severely worn and the assembly gap is too large;

2)The oil ring is inverted, and the lock of the ring is installed on a vertical line;

3)The gap between piston and cylinder is too large;

4)the exhaust temperature is too high, so that the lubricating oil is taken away by the airflow;

5)The crankcase oil level is too high;

6)The automatic oil return valve of the oil separator is not working, and the oil cannot be automatically returned to the crankcase and discharged.

 

10.Increased crankcase pressure

1)The piston ring seal is not strict, resulting in high pressure to low pressure air;

2)The exhaust valve plate is not tightly closed;

3)Air leakage between cylinder liner and sealing surface of body;

4)Ammonia liquid is added into the crankcase, which causes the pressure to rise after evaporation.

 

11.Failure of energy regulating mechanism

1)Oil pressure is too low;

2)Tubing blockage;

3)the oil piston pipe is blocked;

4)The tie rod and rotating ring are not installed correctly, and the rotating ring is stuck;

5)Improper assembly of oil distribution valve.

 

12.The exhaust temperature is too high

1)The condensation pressure is too high;

2)The return air pressure is too low;

3)return air overheating;

4)the dead point clearance of the piston is too large;

5)the cylinder head cooling water is insufficient.

 

13.The heat of returning air is too high

1)There is too little ammonia liquid in the evaporator and the opening of the liquid supply valve is small;

2)The heat insulation of the return air pipeline is poor or the insulation layer is damaged by moisture;

3)Leakage or rupture of the suction valve sheet.

 

14.The exhaust temperature is too low

1)Compressor temperature stroke;

2)Excessive liquid supply to the intercooler;

 

15.The compressor suction pressure is lower than the normal evaporation pressure

1)The opening of the liquid supply valve is too small, and the liquid supply is insufficient, so the evaporation pressure drops;

2)The valve in the suction line is not fully opened;

3)The spool of the valve in the suction pipe falls off;

4)The amount of liquid ammonia in the system is insufficient, although the liquid supply valve is opened, the pressure still does not rise;

5)The suction filter is blocked;

6)Fluid sac in the return airway;

7)The return pipe is too thin

 

16.The needle of the pressure gauge jumps violently

1)There is air in the system;

2)The pressure gauge pointer is loose;

3)The meter valve is too open.

 

17.The compressor exhaust pressure is higher than the condensing pressure

1)The valve in the exhaust pipe is not fully opened;

2)Partial blockage in the exhaust pipe;

3)The exhaust pipe design is not reasonable.

 

 18.Compressor wet stroke

1)The opening of the liquid supply valve is too large;

2)The suction stop valve opens too fast during startup;

3)The suction cut-off valve is opened too fast when the cold storage is restored to normal temperature after melting box.

 

19.There is a knocking sound in the cylinder

1)the dead point clearance of the piston is too small;

2)the gap between the piston pin and the connecting rod small head hole is too large;

3)The suction and exhaust valve plate fixing bolt is sent;

 4)the spring of the false cover deforms and the elastic force becomes smaller;

5)The clearance between piston and cylinder is too large;

6)Excessive or unclean lubricating oil;

7)The valve plate breaks and falls into the cylinder;

8)Liquid ammonia is flushed into the cylinder to produce liquid strike.

 

20.There is a knocking sound in the crankcase

1)the clearance between the connecting rod head tile and the crank pin is too large;

2)The clearance between main bearing and spindle neck is too large;

3)cotter pin is broken and connecting rod nut is loose.

 

21.Cylinder hair pulling

1)the clearance between piston and cylinder is too small, the piston ring pin size is not correct;

2)Suction air contains impurities;

3)The viscosity of lubricating oil is too low or has impurities;

4)The exhaust temperature is too high, causing the viscosity of the oil to decrease.

 

22.Serious oil leakage of shaft seal

1) Poor assembly;

2) Pulling of friction surface between moving ring and fixed ring;

3) Rubber sealing ring aging or inappropriate tightness;

4)the shaft seal spring force is weakened;

5)The back of the fixing ring and the shaft seal gland are not sealed;

6) Crankcase pressure is too high.