Air filter with composite filter element structure

The air filter with the composite filter element structure comprises a shell and an end cover, an installation assembly is installed in the end cover, a transmission rod is in threaded connection with the end cover, a conical block is fixedly connected to the bottom end of the transmission rod, a push block is arranged on the outer wall of the conical block, a protective shell is connected to the outer wall of the push block in a sleeved mode, and the outer wall of the protective shell is provided with a filter element. And an inserting rod is sleeved with the protection shell, the outer wall of the inserting rod is sleeved with an elastic piece, and a sealing plate is fixedly connected to the bottom end of the transmission rod. According to the air filter with the composite filter element structure, the transmission rod, the conical block, the push block, the protective shell, the insertion rod, the elastic piece, the sealing plate and the like are used in cooperation, the end cover is inserted into the oute