Impeller nut locking structure

The utility model discloses an impeller nut locking structure, and belongs to the field of nut locking. One end of a rotating shaft of the structure is a cylinder, the other end of the rotating shaft is an elliptic cylinder, and the masses of the two sides of the rotating shaft with the intersecting plane of the axis of the rotating shaft and the long axis of the ellipse of the section of the elliptic cylinder as an interface are different; a center hole and a pin hole are formed in the pump end shaft head, the center hole extends into the pump end shaft head from the end face of the pump end shaft head in the axial direction, and the pin hole extends into the pump end shaft head from the side face of the pump end shaft head in the radial direction and communicates with the center hole. A strip-shaped groove is formed in the inner wall, connected with the pump end shaft head, of the impeller nut and extends into the impeller nut from the screw hole end face of the impeller nut in the axial direction. The rota