Filter shell with anti-loosening structure

The utility model discloses a filter shell with an anti-loosing structure, which comprises a lower shell, a bottom ring is fixedly mounted at the bottom of the lower shell, a ring is welded on the surface of the lower shell, four L-shaped rods are welded on the top of the ring, an upper shell is arranged on the top of the lower shell, a coil spring shell is rotatably connected with the surface of the upper shell, and the coil spring shell is fixedly connected with the lower shell. A coil spring is fixedly connected between the inner wall of the coil spring shell and the upper shell, four clamping hooks are welded to the bottom of the coil spring shell, and an inner ring is arranged on the inner edge of the bottom of the upper shell in a protruding mode. According to the utility model, the horizontal side of the upper shell is limited through the cooperation of the clamping rod groove and the clamping rod; the L-shaped rod and the clamping hook are matched to drive the coil spring shell to limit the vertical s