Patent of copper cover plate

The utility model discloses a floor drain for preventing odor from overflowing, which comprises a base and a cover plate, wherein the side surface of the cover plate is provided with protrusions matched with the cover plate clamping grooves, the upper surface of the cover plate is provided with drainage grooves which penetrate through the cover plate and are evenly distributed along the circumference, the inner cavity of the base plate is provided with an annular groove, the middle part of the groove is provided with a water outlet, and a buoyancy cover is installed just above the water outlet, and the buoyancy cover comprises a water seal baffle, a buoyancy groove and a positioning clamping groove. The water seal baffle is fixedly installed around the floating box with a closed hollow structure, and the water seal baffle is located in the groove; The positioning slot is installed in the middle of the bottom end of the floating box, and the positioning slot is located in the water outlet. According to the principle of buoyancy, when there is water in the groove, the odor in the sewer pipe is blocked by water; When the water in the tank is insufficient or there is no water, the buoyancy cover completely covers the water outlet under the action of gravity to prevent odor from overflowing.