What are the common faults of screw air compressors? List a few and how to deal with them?

What are the common faults of screw air compressors? List a few and how to deal with them?

1. The oil consumption of the unit is large or the oil content of the compressed air is large;
2. The unit pressure is low;
3. The fan motor is overloaded;
4. The unit current is large;
5. The exhaust temperature of the unit is high (over 100 °C);
6. The exhaust pressure of the unit is too high;
7. The unit cannot be started;
8. The current is large or trips when the unit starts.

repair

1. Setting of the pressure regulator of the air compressor

The unloading pressure is adjusted with the upper adjusting bolt. Rotate the bolt clockwise to increase the unloading pressure, and rotate counterclockwise to reduce the unloading pressure.

2. Air filter

The dust in the suction air is blocked by the filter to avoid premature wear of the compressor and blockage of the oil separator. Usually after 1000 hours or one year of operation, the filter element needs to be replaced. In dusty areas, the replacement interval should be shortened. . When the filter is repaired, it must be stopped to reduce the downtime. It is recommended to replace it with a new or cleaned spare filter element.

3. Cooler

The inner and outer surfaces of the cooler tube should be kept clean with special attention, otherwise the cooling effect will be reduced. It should be cleaned regularly according to the working conditions.

4. Air storage tank, oil and gas separator

Gas storage tanks and oil-gas separators are manufactured and accepted according to pressure vessel standards, and are not modified arbitrarily.

5. Safety valve

The safety valve installed on the gas storage tank and the oil and gas separator should be checked at least once a year. The adjustment of the safety valve should be carried out by a professional. The lever should be loosened at least once every three months to make the valve open and close once. works fine.

6. Digital thermometer experiment

The inspection method of the digital thermometer is to put its thermocouple and a reliable thermometer in the oil bath. If the temperature deviation is greater than or equal to ±5%, the thermometer should be replaced.

7. Motor overload relay

Under normal conditions of the relay, the contact should be closed, and when the current exceeds the rated value, it will open to cut off the motor power.
Extended information

Basic structure of screw air compressor: In the body of the compressor, a pair of helical rotors meshing with each other are arranged in parallel. Usually, the rotor with convex teeth outside the pitch circle is called male rotor or male screw.

The rotor with concave teeth in the pitch circle is called a female rotor or a female screw. Generally, the male rotor is connected to the prime mover, and the male rotor drives the female rotor to rotate the last pair of bearings on the rotor to achieve axial positioning and withstand the compressor. the axial force. Cylindrical roller bearings at both ends of the rotor enable radial positioning of the rotor and withstand radial forces in the compressor.

At both ends of the compressor body, openings of a certain shape and size are respectively opened. One is for suction, called the intake port; the other is for exhaust, called the exhaust port.