Patent ID: 8480776

Claim:
An air filtration device for a compressor, and the compressor having an opening, and the air filtration device comprising: a sealing head, being a hollow cylinder fixed to the opening, and having a first-end opening, a second-end opening formed at a position opposite to the first-end opening, and a screw hole, and the first-end opening having a plurality of first threads; a sealing cap, coupled to a side of the second-end opening, and including a cover plate, a screw coupled to the cover plate and a first positioning portion disposed on the screw, and the screw being screwed into the screw hole; and an air filter, coupled to a side of the first-end opening of the sealing head, and including a filter core and a filter cover installed to an end of the filter core, and the filter cover having a plurality of second threads and a second positioning portion, and the second threads being combined with the corresponding first threads, and the second positioning portion being positioned on the first positioning portion; wherein when the air filter is rotated, the cover plate is moved with the filter cover to seal or leave the second-end opening.