Water inlet section structure of multiple-stage centrifugal pump with fish-mouth suction port

Abstract

The invention relates to a water inlet section structure of a multiple-stage centrifugal pump with a fish-mouth suction port. The water inlet section structure is characterized by comprising a water inlet section pump body and a first-stage middle section pump body, wherein the water inlet section pump body and the first-stage middle section pump body sleeve a pump shaft; the suction port is formed in the first end of the water inlet section pump body; a bearing box is arranged in the suction port; the first end of the bearing box is in the shape of a solid cone, the cone shape is gradually reduced from the tail end of the central line to the first end, and the shape of the top end of the first end is similar to a fish mouth; the second end of the bearing box is a hollow cylinder and is open; and a slide bearing is installed at the second end of the bearing box, the slide bearing is a hollow cylinder and the two ends of the slide bearing are open separately, and the first end of the pump shaft stretches into the slide bearing. According to the water inlet section structure, the energy loss of a liquid at the suction port is reduced, and the hydraulic performance of the multiple-stage centrifugal pump is improved.

Description

technical field [0001] The invention relates to the field of centrifugal pumps, in particular to a water inlet section structure of a multistage centrifugal pump whose suction port is fish mouth type. Background technique [0002] The role of the structure of the water inlet section of the multistage centrifugal pump is to suck the liquid in the pipeline from the suction port of the pump body of the water inlet section, then flow into the first stage impeller, and pass through the impellers of all stages in turn. Therefore, the flow state of the liquid in the suction port will directly affect the flow state of the liquid in the impeller, thereby affecting the working efficiency and cavitation resistance of the multistage centrifugal pump. The water inlet section structure of the multistage centrifugal pump in the prior art includes a water inlet section pump body. The first end of the pump body in the water inlet section is provided with a suction port, and a bearing box is...

AI Technical Summary

Problems solved by technology

When the liquid enters the suction port, it is disturbed by the bearing box, and the space for the liquid to flow suddenly becomes smaller, and the liquid that hits the bearing box in the forward direction will be blocked by the bearing box, and flow back to the suction port, causing the liquid to flow in the suction port. Large energy loss, reducing the hydraulic performance of multistage centrifugal pumps

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