How to maintain a twin screw air compressor

1. Regularly detect the radial displacement of the screw rotor

According to the equipment structure, both oil injection screw and oil-free screw air compressors are composed of a pair of male and female rotors and the external surface of the head housing, forming a working chamber. The male and female rotors of the oil injection screw compressor use main and driven gears, while the oil-free screw uses synchronous gears. Due to the small gap between the male and female rotors and between the rotor and the object, excessive radial displacement can damage the rotor and the external surface of the housing, Even after correction, it will affect the inspection of the air compressor and cause a lot of useless work.

2. The air compressor box should be sealed for use

In summer, UNI90-160 and UNI5-55 usually open the box cover according to heat dissipation needs. After consulting experts, it was found that the flow direction of the box cooling air duct is a specific plan. Although opening the box door can reduce the external temperature of some components, this operation undermines the overall ventilation plan of the unit and has a poor effect.

3. Strictly require the use of specialized oil filter libraries

The oil filter for the smooth oil of the air compressor is specially made, with an O-ring seal and compression spring at the oil inlet. There is a special low oil pressure safety valve inside the special oil filter, which can ensure the smooth demand of the unit after tripping when the oil pressure is too low. This is particularly important for oil injected screw compressors.

4. Strictly adhere to the use of smooth oil

The oil-free screw air compressor has a long service life for smooth oil, with an oil change cycle of about two years or continuous operation of 12000 hours; Oil injection twin screw air compressor, approximately 4000-8000h. Regularly analyze the water content in smooth oil, and when the water content is high, it is necessary to replace it all. When replacing smooth oil, the oil should be completely drained, and the machine head, oil tank, oil cooler, oil filter, and oil cut-off valve should all have drain plugs. Before draining the oil, ensure that the machine is running for a period of time to ensure oil temperature.

5. Motor greasing

When adding grease to the motor, it is necessary to ensure that it is carried out under stable load and constant speed; Oil free machine, 20g of grease per end every 2000h, fuel injection machine, 75g of grease per end every 2000h.

6. Shutdown

For oil-free machines, shutdown operation is particularly important. Before stopping, it is necessary to open the manual drain valve of the middle and rear coolers to completely drain the condensate water, and then press the "unload" button to ensure that the unit operates at 10% load for 20 minutes, completely drying the moisture on the surface of the rotor (the rotor surface is covered with a layer of tetrafluoroethylene protective sleeve).

7. Strictly prevent rotor reversal

Reverse rotation of the rotor will reduce the amount of smooth fuel injection, causing the male and female rotors to bite, causing the rotor to experience reverse force and friction between the end of the rotor and the outer surface of the machine head housing.

Unijie provides customers with industrial equipment such as screw air compressors, oil-free compressors, nitrogen compressors, sulfur hexafluoride (SF6) compressors, helium compressors, medium and high pressure air compressors. We not only provide customers with air compressors, but also provide solutions for oil-free compressed gas systems.