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Method for designing double-helix axial-flow pump impeller

A design method and technology of an axial flow pump, applied in the components, pumps, pump elements, etc. of pumping devices for elastic fluids, which can solve the problems of increasing instability, pump body vibration and noise, unbalanced centrifugal inertial force and other problems to achieve the effect of improving the balance effect, reducing vibration and noise

Active Publication Date: 2013-08-21
JIANGSU GUOQUAN PUMP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the structural characteristics of the axial flow pump with single helical blades, its shape is asymmetrical, and its mass distribution is uneven.
When the impeller rotates, an unbalanced centrifugal inertial force is generated, which causes the pump body to vibrate and make noise, and increases the instability of the pump during operation.

Method used

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  • Method for designing double-helix axial-flow pump impeller
  • Method for designing double-helix axial-flow pump impeller
  • Method for designing double-helix axial-flow pump impeller

Examples

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Embodiment Construction

[0052] figure 1 , figure 2 with image 3 Together determine the impeller shape for this embodiment. It is different from the impeller of ordinary axial flow pump. The impeller inlet is a spiral forward extension type. The inlet side (13) looks like a sickle shape. The blades (3) spiral upward along the hub (4), and the number of blades (3) There are only two, symmetrically arranged blades, which have a very good balancing effect. The present invention determines the impeller inlet diameter D through the following relations 1 (1), impeller hub diameter d h (2), the maximum outer diameter of the impeller D 2max (6), the outlet edge inclination angle α 2 (7), outlet side width b 2 (8), the axial length of the impeller L (9) and the minimum outer diameter of the impeller D 2min (10).

[0053] D 1 = K 0 Q / n 5 ...

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Abstract

The invention provides a method for designing a double-helix axial-flow pump impeller. A double-helix blade can automatically balance unbalanced centrifugal inertia force when the impeller rotates and reduce vibration and noise generated by a pump in running. The design formulae for the main impeller geometric parameters of the impeller inlet diameter D1, the impeller hub diameter dh, the impeller largest external diameter D2max, the outlet side slant angle alpha 2, the impeller smallest external diameter D2min, the outlet side width b2 and the impeller axial length L are given. The impeller designed with the method can meet requirements for sewage treatment, simultaneously can improve impeller balance effect, reduce the vibration and the noise generated by the pump in running, and improve overflowing capacity, undamaged performance and winding-free performance of the axial-flow pump. Therefore, the helix axial-flow pump with the impeller is especially suitable for the sewage treatment industry.

Description

technical field [0001] The invention relates to a method for designing an impeller of an axial flow pump, in particular to a method for designing an impeller of a double-screw axial flow pump. Background technique [0002] At present, known axial flow pump impellers use airfoil blades, that is, the lift force method and the streamline method are used to design the axial flow pump blades. The airfoil blades designed by these two design methods put forward strict requirements on the working environment of the axial flow pump and the placement of the blades. That is, it can only be used to transport clean water or mild sewage. If it is used in a sewage pumping station, the water quality is complex, there is a lot of sediment, and there are many sundries. Seal failure, motor water ingress, frequent pump alarms, increased maintenance times, and even motor burnout; and if the blade placement angles are inconsistent, it will cause operating vibration, and the cavitation performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/18
Inventor 朱荣生杨爱玲
Owner JIANGSU GUOQUAN PUMP MFG CO LTD
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