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Transitional flow channel structure of multi-stage centrifugal pump and design method of transitional flow channel structure

A technology of transition flow channel and structure design, which is applied to the components, pumps, and pump components of the pumping device for elastic fluid, which can solve the problem of the uncompact structure of the pump body, the large size of the pump body, and the increase of pump cavitation, etc. problem, to achieve the effect of compact structure, small size and uniform flow rate

Active Publication Date: 2017-08-11
兰州兰泵有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The efficiency of the radial diffusion transition flow channel is higher than that of the oblique diffusion flow channel, but the overall size is larger and the pump body structure is not compact
Although the oblique diffusion flow channel has a compact structure, the hydraulic efficiency is reduced and the pump cavitation is increased.
[0004] At present, the transition channel of domestic axially split multi-stage split pumps adopts the combination of long transition channel and semi-spiral water suction chamber, which not only makes the pump body too large in size and uncompact in structure, but also makes the Increased NPSH of the pump and reduced hydraulic efficiency

Method used

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  • Transitional flow channel structure of multi-stage centrifugal pump and design method of transitional flow channel structure
  • Transitional flow channel structure of multi-stage centrifugal pump and design method of transitional flow channel structure
  • Transitional flow channel structure of multi-stage centrifugal pump and design method of transitional flow channel structure

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Embodiment Construction

[0035] A transition channel structure of a multi-stage centrifugal pump, comprising multi-stage transition channels spliced ​​together, each transition channel includes a pressure water chamber 1, a diffusion elbow 2, and a water absorption chamber 3, and the pressure water chamber 1 and the water absorption chamber 3 Connected, the outside of the water absorption chamber 3 is provided with a diffusion elbow 2; the water inlet of the diffusion elbow 2 is connected with the pressure water chamber 1 of the same level, and the water outlet of the diffusion elbow 3 is connected with the water absorption chamber 3 of the next level, and the water absorption chamber 3 It is spiral, and the diffuser elbow 3 is annular. The arc angle Φ of the diffusion elbow 3 is 180-270°. The reference circle 4 of the water absorption chamber and the reference circle 5 of the pressure water chamber are arranged concentrically. The outer edge of the annular diffuser elbow 3 is formed by excessive spl...

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Abstract

The invention relates to the technical field of pump body hydraulic design, in particular to a transitional flow channel structure of a multi-stage centrifugal pump and a design method of the transitional flow channel structure. The transitional flow channel structure is formed by splicing a plurality of stages of transitional flow channels. Each stage of transitional flow channel comprises a pumping chamber, a diffusion elbow and a water absorbing chamber, wherein the pumping chamber communicates with the water absorbing chamber, and the diffusion elbow is arranged on the outer side of the water absorbing chamber; and a water inlet of the diffusion elbow communicates with a pumping chamber of the same stage, a water outlet of the diffusion elbow communicates with a next stage of water absorbing chamber, the water absorbing chamber is in a full spiral shape, and the diffusion elbow is annular. By adopting the annular diffusion elbows, the transitional flow channel is smoother, the size is greatly reduced, and a pump body is compact in structure and better in intensity. In addition, one full-spiral water absorbing chamber is additionally arranged in front of an inlet of a next stage of impeller, the fluid absorbing performance is better, and the flowing speed is even and stable.

Description

technical field [0001] The invention relates to the technical field of water conservancy design of a pump body, in particular to a transition channel structure of a multistage centrifugal pump and a design method thereof. Background technique [0002] The transition channel is mainly suitable for axially split multistage centrifugal pumps. The pump volute is integrally cast, the rotor is supported at both ends, and the center of the pump body is supported, with good stability. High reliability, easy maintenance and repair. The axially split multistage centrifugal pump is divided into two parts, the pump body and the pump cover, which are integrally cast. The transition channel is the channel through which the liquid flows between the stages. The design of the transition channel not only determines the shape and castability of the pump body, but also has a certain impact on the efficiency of the pump. [0003] The transition flow channel refers to the flow channel from the ...

Claims

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Application Information

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IPC IPC(8): F04D29/42F04D29/66
CPCF04D29/426F04D29/669
Inventor 吴应德张涛马柏青马文生杨德旭王民祥
Owner 兰州兰泵有限公司
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