Two-stage and two-discharge graphite pump

Abstract

The invention provides a two-stage and two-discharge graphite pump capable of preventing an impeller from being damaged. All flow passage components contacted with a medium in a pump are made of graphite; an electric motor transmits power to the impeller through a shaft joint, a long shaft,and a short shaft; the pump comprises a pump cover, a pump body, the impeller, a bracket and a rotary shaft; the pump adopts two-stage impellers which are a first-stage impeller and a second-stage impeller; the first-stage impeller and the second-stage impeller are orderly limited and installed on the same one rotary shaft; positive and opposite guide vanes are mounted between the two-stage impellers, and a pumping chamber of the second-stage impeller adopts a symmetrical two-discharge structure. After adopting the two-stage impeller, the torsion and the centrifugal force impacted on one stage of impeller are less than the torsion and the centrifugal force when the single-grade impeller is adopted under the condition of reaching the same lift and the flow rate; and after adopting the pumping chamber of the two-discharge symmetrical structure, the radial force of the impeller caused by the fluid can counteract mutually, so that the damage of the impellers can be prevented.

Description

[0001] technical field [0002] The invention relates to a graphite pump, in particular to a double-stage double-discharge graphite pump, which is mainly used for conveying corrosive medium. Background technique [0003] Graphite pump is a kind of corrosion-resistant pump. All the flow parts in the pump that are in contact with the medium are made of graphite. Graphite pumps are widely used in the transportation of corrosive media, from the perspective of industrial production, including chemical, pesticide, metallurgy, chemical fiber, medicine, light industry and environmental protection. The temperature used is mostly between 40 and 50 °C. Because graphite has good thermal shock resistance, it will not crack under sudden cooling and sudden heating, and it can reach 220 °C in special cases. The flow rate of graphite pump is 3~200m 3 / h, the head is 10 ~ 65m. The graphite pump for chemical industry is generally a centrifugal pump. The impeller, volute chamber, shaft seal ...

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Problems solved by technology

However, it is very difficult to improve the mechanical properties of impregnated graphite

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