Routine inspection and maintenance steps of screw air compressor

Screw air compressor primary maintenance mainly has the following contents and steps:

1. Check the joint contact and insulation resistance of the electrical part of the air compressor

you can first use an ammeter to detect the current value of each item or use an infrared temperature measuring gun to detect the temperature of the incoming terminal, and make a preliminary judgment to assist in judging whether the wire head is loose.

The electrical part of the air compressor is divided into the main circuit, control circuit and signal transmission (temperature, pressure sensor) circuit. Due to the vibration generated during operation of the air compressor, some wire joints will loosen after normal time. The loosening of the wire joints will cause the unit to fail to start in light, and will cause serious disasters such as protection function failure, arc short circuit, electric shock, etc. Therefore, the electrical part should be checked regularly.

When checking after power on, you can swing the wires one by one by hand to feel the tightness of the thread ends, and the loose thread ends should be tightened. In addition, a shaking table is required to detect the insulation between the motor, equipment and the ground. The insulation resistance should be controlled above 500 megohms, otherwise it should be dried or repaired.

2. Maintenance of oil filling motor

bearing in the proper lubrication to ensure life, the front and rear end of the motor is equipped with bearings. Normal operation, so grease should be injected regularly, and the type of grease should be selected according to the parameters provided by each manufacturer.

3. Clean the intake relief valve and filter element

1) Removal of the relief valve: Remove the hose connecting the relief valve and the air filter (note that debris must not enter the air inlet);

2) Remove all other air pipes connected with the relief valve;

3) Remove the solenoid valve coil;

4) Remove the nut assembled between the relief valve and the host and take it down;

5) Move the relief valve to the ground covered with clean paper or related clean laying.

The above cleaning agent shall be selected according to the degree of dirt. The cleaning agent shall be soapy water, diesel oil, clean gasoline, water and other cleaning agents that will not damage the air compressor accessories. Generally, it is recommended to use soapy water or diesel oil for cleaning) Device components: The component devices are disassembled according to the reverse steps. The position of the sealing ring and the movable components should be coated with appropriate amount of oil, which can make the sealing ring better installed and the movable parts more flexible. If you don't know and remember the position of each part, you can remove each part and clean it before installing it. Note: There are many parts in the relief valve. However, do not install the parts on the valve body first, and then assemble them together after all the parts are cleaned.

The cleaning method of the air intake filter element is to take out the filter element and gently tap its upper and lower end surfaces, or gently blow off with compressed air to clean the dust and dirt on the filter element. Do not scrub with oil or water. If the filter paper is found to be damaged or heavily clogged with dust and dirt, it must be replaced with a new one.

4, cleaning the minimum pressure valve (also known as pressure maintenance valve)

1) Clean the minimum pressure valve: clean the minimum pressure valve according to the method of cleaning the unload valve.

2) Assembly of the minimum pressure valve: The structure of the minimum pressure valve is very simple. It can take out all the internal components by disassembling the valve body cover.

3) Assembly of the minimum pressure valve: Assemble the components according to the reverse steps of disassembly. The assembly process will not be described one by one, but attention should be paid to the direction of the U-ring when there is a U-ring inside.

5. Clean the return check valve

1) Assembly of oil return single valve: the valve body has a connection. Take out the spring, steel ball and steel ball seat. There is also a filter screen inside the local one-way valve.

2) Clean the oil return check valve: clean the valve body, spring, steel ball and steel ball seat with cleaning agent. If any, clean them together.

3) Assembly of return check valve: Install the check valve according to the reverse steps of removal.

6. Clean the temperature control valve

1) cleaning temperature control valve: according to the method of cleaning unload valve cleaning temperature control valve all parts.

2) temperature control valve assembly: temperature control valve is the surface has a cover. Find a suitable nut to screw into the cover, then use the circlip pliers to take out the circlip that fixes the cover, and then use the pliers to pull the nut just screwed in to take off the cover and all internal parts.

7. Clean the cooler

when the oil cooler fouling is more serious, you can remove the oil cooler alone, open the two end covers, with a special cleaning steel brush or other tools to remove the scale. When the temperature cannot be effectively reduced by cleaning the medium side of the cooler, the oil side needs to be cleaned as follows:

1) Disconnect the inlet and outlet pipes.

2) Inject the cleaning solution to soak or use the pump cycle to wash (recoil effect is better).

3) Rinse with clean water.

4) Blow dry with dry air or remove water with dehydrated oil.

5) Install the inlet and outlet pipes

8. Clean the water-gas separator

the structure of the water-gas separator is similar to that of the oil-gas tank, the air inlet is designed by the wall, and the solid type is centrifugal force. Due to the weight factor of water, it can effectively separate the water in the compressed air.

Cleaning of the water vapor separator: disassemble the cover of the water vapor separator, and then use the cleaning agent to invade and clean.

9. Confirm all parameters

after all the above components are cleaned and dried, they will be installed in the air compressor. After all the components are installed in the air compressor, check again for omissions and clean up the tools and other items used during installation.