High-temperature molten salt pump with composite heat-dissipation structure

The invention relates to a high-temperature molten salt pump with a composite heat-dissipation structure. A motor is connected with a bearing box through a motor frame, the bearing box is connected with one side of a bottom plate through a middle frame, a pump body is connected with the other side of the bottom plate, a pump spindle is supported on the bearing box by a bearing and is connected with an impeller by an impeller nut, a heat insulation groove group and a heat-dissipation fin group are arranged on the pump spindle in the middle frame, the heat insulation groove group comprises multiple circular heat insulation grooves in the circumferential direction of the pump spindle and/or one spiral heat insulation groove around the circumference of the pump spindle in the axial direction of the pump spindle, the heat-dissipation fin group comprises more than one planar heat-dissipation fin and/or more than one twisted heat-dissipation fin. The composite heat-dissipation structure with the heat-blocking grooves for heat shielding design and the heat insulation groove group design is adopted by the pump spindle, and the opening and heat-blocking design of a connecting bracket and a cooling water jacket of the pump spindle are matched to realize heat dissipation and blocking of high-temperature heat on the surface of the pump spindle; and the high-temperature molten salt pump has a simple structure, the pump spindle is actively cooled by multiple passes in a composite manner, the heat dissipation effect is good, high-temperature heat of the bearing can be effectively prevented, the service life of the bearing is prolonged and the stable running of the high-temperature molten salt pump is ensured.