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Low-specific-speed centrifugal composite impeller and design method thereof

A centrifugal compound, low specific speed technology, applied in computing, mechanical equipment, instruments, etc., can solve the problems of impeller axial vortex, impeller performance decline, flow channel diffusion and other problems

Active Publication Date: 2017-05-31
杭州大路实业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the traditional blade profile design, each blade is a single blade from the inlet to the outlet. For pumps with small flow rate and low specific speed, the ratio of the outer diameter of the impeller to the suction diameter is large, and the ratio of the area of ​​the impeller outlet to the inlet area is large, resulting in flow Severe channel diffusion, axial vortex or backflow inside the impeller, resulting in impeller performance degradation

Method used

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  • Low-specific-speed centrifugal composite impeller and design method thereof
  • Low-specific-speed centrifugal composite impeller and design method thereof

Examples

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Embodiment 1

[0030] Embodiment 1: as figure 1 and figure 2 As shown, a low specific speed centrifugal composite impeller includes a front cover 1 and a rear cover 2, and several impeller cavities 3 are formed between the front cover 1 and the rear cover 2, and the impeller cavities 3 start The initial stage is a single blade, and the outlet of the impeller chamber 3 is double blades, and the single blade and the double blades in the impeller chamber 3 are distributed integrally.

[0031] Described impeller cavity 3 is provided with three, and three impeller cavities 3 are equally distributed, and described impeller cavity 3 is arc-shaped, and the width of described single-blade mid-blade cavity gradually expands, and described double-blade mid-blade The length of chamber I4 is greater than the length of leaf chamber II5.

[0032] An airfoil space 6 is formed between the cavity I4 and the cavity II5 in the two blades.

[0033] A design method for a low specific speed centrifugal compoun...

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Abstract

The invention relates to a composite impeller, in particular to a low-specific-speed centrifugal composite impeller and a design method thereof. The impeller comprises a front cover plate and a rear cover plate, a plurality of impeller cavities are formed between the front cover plate and the rear cover plate, a single blade is arranged at the starting segment of each impeller cavity, dual blades are arranged on an outlet of each impeller cavity, and the single blade and the dual blades in each impeller cavity are integrally distributed. According to the low-specific-speed centrifugal composite impeller and the design method thereof, the structure is compact, the use performance is improved, reliability is high, and the impeller is particularly suitable for a small-flow low-specific-speed pump, and wide in adaptation range.

Description

technical field [0001] The invention relates to a composite impeller, in particular to a low specific speed centrifugal composite impeller and a design method thereof. Background technique [0002] Petrochemical, military, nuclear power and other fields need some centrifugal pumps with small flow and high head. The original traditional choice would be to use reciprocating pumps or high-speed centrifugal pumps. However, due to the short trouble-free running time of reciprocating pumps, the seal is easy to leak, which brings unsafe hidden dangers to the user's process system. Therefore, centrifugal pumps have gradually been used in recent years. Replacement, typical high-pressure water injection pumps such as hydrogenation units, have been gradually replaced by small-flow multi-stage centrifugal pumps from the original reciprocating pumps. High-speed centrifugal pumps are not suitable for many process and technological occasions due to their complex transmission mechanism and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/22F04D29/24F04D29/66G06F17/50
CPCF04D29/2238F04D29/2244F04D29/2272F04D29/245F05D2260/81F05D2230/21G06F30/17
Inventor 郑红海李文涛袁静
Owner 杭州大路实业有限公司
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