Lip-shaped labyrinth seal ring with L-shaped metallic framework and U-shaped metallic framework reversely combined

The invention discloses a lip-shaped labyrinth seal ring with an L-shaped metallic framework and a U-shaped metallic framework reversely combined. The lip-shaped labyrinth seal ring comprises an inner oil seal body and an outer oil seal body, the inner oil seal body is supported by the reverse L-shaped metallic framework (3) and molded on the reverse L-shaped metallic framework in a vulcanization mode, a double-hook dustproof lip rubber body (2) vertically arranged on a horizontal arm of the reverse L-shaped metallic framework extends downwards, the double-hook dustproof lip rubber body surrounds the back portion of a reverse L-shaped perpendicular arm along the bottom plane of the reverse L-shaped metallic framework, and the double-hook dustproof lip rubber body and the reverse L-shaped perpendicular arm are connected into a whole; the outer oil seal body is supported by the inverted-U-shaped metallic framework (4), a vulcanization molded rubber body extends upwards along a horizontal section of the tail end