Companies that have used permanent magnet variable frequency air compressors know that the three filters of permanent magnet variable frequency air compressors mainly include: air filter, oil filter, and oil-gas separator. However, the methods of replacing each filter element are slightly different. Here are some replacement methods for the three filters of permanent magnet variable frequency air compressors and some matters that should be paid attention to:
The first choice is to replace the air filter
We all know that the dust in the air inhaled by the screw air compressor will be blocked in the air filter. In order to avoid premature wear of the screw compressor and blockage of the fine filter element in the oil-gas separator, it is usually necessary to clean or replace the air filter element after running for 500 hours (Note: different manufacturers have different requirements); so in some places where the machine is running in a dusty space, the replacement time will be shortened. When replacing the filter, the permanent magnet variable frequency air compressor must be stopped. In order to reduce downtime, it is recommended to replace a new or cleaned spare filter element.
Method:
1. Facing a flat surface, tap the two end faces of the filter element in turn to remove most of the heavy and dry dust.
2. Use dry air with a pressure less than 0.28Mpa to blow in the opposite direction of the inhaled air. The nozzle should be at least 25mm away from the folded paper, and blow up and down along its height.
3. Check the filter element. If it is found to be thin, pinhole or damaged, it should be discarded.
The second is the replacement of the oil filter
1. Unscrew the oil filter and discard it.
2. Clean the filter housing carefully and clear the front and rear pressure difference holes.
3. Check the performance of the pressure difference transmitter.
4. Install oil on the new filter element (apply a layer of oil on the filter element seal).
5. When installing the filter element, turn it until it contacts the seal, and then tighten it manually for 1/3 turn.
6. After starting the machine, check for leaks.
Note: The filter element can only be replaced after the compressor stops running and the pressure is released. In addition, be careful with hot oil to prevent burns and do not spill the oil.
Finally, the oil-gas separator filter element is replaced.
1. Remove the connecting hoses and copper pipes on the minimum pressure valve.
2. Remove the copper pipe of the oil return pipe.
3. Remove the cover.
4. Pull out the filter element
5. Clean the cylinder.
6. After replacing the filter element, install it in reverse order.
Note:
1. Before installation, it is necessary to check whether the rubber and asbestos pads have anti-static properties (conductive nails must be installed);
2. During installation, it is necessary to prevent unclean objects from falling into the oil barrel;
3. When installing the oil return pipe, it must be ensured that the pipe is inserted into the bottom of the filter element.
(Note: There are differences in some replacement methods for different air compressor manufacturers. It is recommended to replace and maintain according to the guidance of the air compressor manufacturer.)