Centrifugal slurry pump for conveying solid-containing slurry

Abstract

The invention discloses a centrifugal slurry pump for conveying solid-containing slurry. The centrifugal slurry pump comprises a pump body, a pump cover, an impeller, a main shaft, a shaft sleeve and a shaft sealing device, the shaft sealing device comprises a sealing box connected with the pump body, a front seal and a rear seal, the front seal and the rear seal are arranged in a spaced mode, the rear seal is a mechanical seal of a driving part and a static ring, and a solid-liquid separation cavity is formed in the pump body; and the solid-liquid separation cavity is an annular cavity between an impeller spoke plate and the front seal, the impeller spoke plate is provided with at least one liquid inlet hole and a liquid drainage channel, the liquid inlet hole communicates with a suction inlet and the solid-liquid separation cavity, one end of the liquid drainage channel communicates with the side wall of the solid-liquid separation cavity, and the other end of the liquid drainage channel communicates with a peripheral pump cavity of the impeller spoke plate. When the centrifugal pump conveys more than 30% of solid-containing slurry, externally connecting of cooling water is not needed, and a mechanical seal of the centrifugal pump cannot be damaged.

Description

technical field [0001] The invention relates to the field of centrifugal slurry pumps, in particular to a centrifugal pump for transporting slurry with a solid content greater than 30%. Background technique [0002] When the anti-corrosion centrifugal pump transports slurry containing solids, the commonly used shaft seals are mechanical seals or hydrodynamic seals, and these shaft seals have a common use condition, that is, the shaft seal of the cooling pump must be flushed with external cooling water, otherwise the shaft The seal will be damaged soon, and the external cooling water of the mechanical seal will not only consume water resources, but also the cooling water will cause secondary pollution, increase the sewage treatment procedures, and increase the operating costs of the enterprise. [0003] In order to overcome the above deficiencies, patents (201820807691.2, 201820807683.5) disclose a mechanical seal combination with a rubber ring seal and a driving static ring,...

AI Technical Summary

Problems solved by technology

The reason for the above adverse results is that the fluidity of the sealing part is insufficient, resulting in sealing heat, but the fluid does not flow, and the temperature of the shaft sealing part cannot be taken away, causing the temperature to rise. Sometimes the temperature will reach about 130 ° C. Further damage is Decompose and deform the rubber sealing ring, making the seal invalid

[0005] There are two reasons for the poor fluidity of the fluid in the sealing part: one is high material concentration and poor fluidity; the other is that the outlet pressure is small, and when the fluid flows back from the outer periphery of the impeller to the shaft seal part, there is no back pressure, and the fluid in the shaft seal part by impeller 1 (as figure 1 ) The back vane 1.1 set on the width plate is thrown in the pump casing. Due to the low pressure of the fluid in the pump chamber, it cannot flow back to the shaft seal to cool the seal, which will cause no liquid lubrication and cooling at the shaft seal, and then cause the first The damage of the lip seal of the first group makes the slurry enter the mechanical seal part of the second group, and the mechanical seal of the second group is also damaged due to the abrasion of particles, and finally the entire combination or shaft seal is damaged

[0006] The existing technology has the above-mentioned shortcomings, especially the disclosed shaft sealing technology without external cooling water, which still cannot transport slurry with a solid content higher than 30%, and still needs to be improved, and there is still room for improvement

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