External mechanical sealing inner guiding wheel

The utility model discloses an external mechanical sealing inner guiding wheel. An O-shaped ring sealing device is arranged on a bearing base and is in contact with a bearing inner ring. The guiding wheel is connected to a guiding wheel shaft in an assembling mode through a key and rotates with the guiding wheel shaft together. The guiding wheel shaft is assembled on a bearing and rotates along with the bearing inner ring. A mechanical sealing moving ring is assembled on the guiding wheel shaft and rotates with the guiding wheel shaft. A mechanical sealing static ring is fixedly arranged on a static ring base. When the mechanical sealing moving ring rotates, the sealing faces of the mechanical sealing moving ring and the mechanical sealing static ring are in tight contact, water is prevented from flowing in, and a connector type forced filling oil cup is arranged on the bearing base through threads. Water sealing, mechanical sealing and rubber oil sealing are used for sealing, a water draining reverse flowing