Complete sealed pump

Abstract

The invention relates to a full sealing pump. Impellers (3) and a shaft sleeve (6) inside a pump body (1) are sheathed on a pump shaft (8) through keys (7); nuts (2) of the impeller at a shaft end of the pump shaft tightly lock the impeller and the shaft sleeve on the pump shaft; a pump cover (4) is installed inside the pump body and a pressing cover (5) is installed on the pump cover; the fastening and sealing faces between the impeller and the impeller nuts, the impeller and the shaft sleeve and the pump cover and the pressing cover are all stepped end faces, the convex faces of stepped end faces are fastening loaded faces while the concave faces thereof are sealing faces, and seal rings are arranged on the sealing faces to separate the sealing faces from the loaded faces so as to avoid the influence of direct load on the sealing effect; the loaded faces have the expected fastening effect for preventing the impeller nuts from dropping. The full sealing pump has good sealing effect and the fastening and sealing faces between the impeller and the impeller nuts, the impeller and the shaft sleeve and the pump cover and the pressing cover realize the full sealing, thus stopping liquid leakage, improving sealing performance of the pump body and increasing the service life of the pump.

Description

technical field [0001] The invention relates to a fully sealed pump in the fields of chemical pumps and sewage pumps. Background technique [0002] The sealing of existing chemical pumps or sewage pumps generally adopts the sealing measures between the moving part and the lip of the sealing part, while the sealing of the mating surface of the parts in the pump body is ignored. The fastening and sealing surfaces between the impeller and the impeller nut, the impeller and the shaft sleeve, the pump cover and the gland inside the existing pump body are plane fastening and sealing surfaces. The impeller is directly locked on the pump shaft through the impeller nut, or a flat sealing ring is directly added at the fastening force between the impeller and the impeller nut, and the fastening force between the impeller and the shaft sleeve and the pump cover and the gland is also directly fastened. Or add a flat sealing ring at the fastening place, the sealing surface and the force-...

AI Technical Summary

Problems solved by technology

Among them, a direct fastening method affects the sealing performance due to deviations in the accuracy of the fastened sealing surface, and the seal is unreliable, which is prone to leakage of chemical liquids and sewage, causing corrosion of other parts and shortening the service life of the pump.

Another fastening method of adding a flat sealing ring, such as when fastening the impeller nut on the sealing surface, if the fastening force is too large, it will easily cause damage to the flat sealing ring and lose its sealing effect; if the fastening force is too Hours, the impeller nut can not play a fastening role, easy to loose and fall off, resulting in damage to the pump, reducing the service life of the pump

Images