CN107514385A - A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three - Google Patents

A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three Download PDF

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Publication number
CN107514385A
CN107514385A CN201710891726.2A CN201710891726A CN107514385A CN 107514385 A CN107514385 A CN 107514385A CN 201710891726 A CN201710891726 A CN 201710891726A CN 107514385 A CN107514385 A CN 107514385A
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CN
China
Prior art keywords
mrow
impeller
msub
mtd
mfrac
Prior art date
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Application number
CN201710891726.2A
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Chinese (zh)
Inventor
朱荣生
钟伟源
杨爱玲
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JIANGSU GUOQUAN PUMPS CO Ltd
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JIANGSU GUOQUAN PUMPS CO Ltd
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Priority to CN201710891726.2A priority Critical patent/CN107514385A/en
Publication of CN107514385A publication Critical patent/CN107514385A/en
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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/2205Conventional flow pattern
    • F04D29/2216Shape, geometry
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/2261Rotors specially for centrifugal pumps with special measures
    • F04D29/2294Rotors specially for centrifugal pumps with special measures for protection, e.g. against abrasion
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/24Vanes
    • F04D29/242Geometry, shape
    • F04D29/245Geometry, shape for special effects
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/10Geometric CAD
    • G06F30/17Mechanical parametric or variational design

Abstract

The invention provides a kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three, it is characterised in that:Impeller is three blade half-opened impeller forms, and the impeller surface is coated with nanometer superhard composite coatings of WC 8Co using HVAF technology, and provides the design method of impeller main geometric parameters, including impeller outer diameter D2, impeller outlet width b2, blade exit laying angle β2, subtended angle of bladeOn the one hand perfect existing design scheme, on the other hand life and chemical engineering sewage pump work environment are more fully considered, easy produced problem has been done to design formula in particularity and practice for its work targetedly optimizes, the present invention be able to ensure that half-opened impeller abrasion resistance and efficiently, stably work, strengthen its adaptability to harsh environments.

Description

A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three
Technical field
The present invention relates to field of fluid machinery, more particularly to a kind of blade non-clogging impeller the Hydraulic Design side of semi-open type three Method.
Background technology
Sewage pump belongs to one kind of transh pump, mainly for delivery of municipal sewage or contains the solid particles such as fiber, paper scrap Fluid media (medium).Due to containing the easily winding easily fibre object of deposition or pack in the medium that is conveyed.Therefore this kind of pump runner is easily stifled Plug, pump is once pump cisco unity malfunction can be made by being blocked, and motor overload heating even burns motor, so as to cause blowdown not smooth. Serious influence is brought to urban life and environmental protection.Therefore, an important factor for anti-blocking and reliability are sewage pump qualities.
For sewage pump as other pumps, impeller, pumping chamber are two big core components of sewage pump.The quality of its performance, It is main just to represent the quality of pump performance, the performance of anti-blockage of sewage pump, the height of efficiency, and cavitation performance, anti-erosion performance It is to be ensured by impeller and two big part of pumping chamber.
The structure of impeller is divided into four major classes:Four kinds of vane type, spiral-flow type, flow channel type and spiral centrifugal.
Wherein, half-opened impeller is easily manufactured, when being resulted in blockage in impeller, easily can clear up and repair, but In longtime running, under the abrasion of particle the gap of blade and pumping chamber madial wall can increase, so that efficiency reduces.And And the Pressure difference distribution that the increasing in gap can be destroyed on blade.Substantial amounts of eddy loss is not only produced, and the axial force of pump can be made Increase, simultaneously as gap increases, the stability of the fluidised form of liquid is destroyed in runner, pump is produced vibration.Prior art In, this kind of pattern impeller is not easy to conveying and contains bulky grain and long stapled medium, and from performance, the pattern impeller adiabatic efficiency is low, Peak efficiency is approximately equivalent to 92% or so of common double shrouded wheel, and head curve is relatively flat.
At present, for semi-open type sewage impeller of pump of the prior art, still having in terms of the Hydraulic Design many can improve Place.Due to the particularity of working environment, often containing dirt particles such as substantial amounts of silt, paper scrap and silk scarf fragments in sewage Medium, these sewage dirt media can flow into dredge pump in the form of solid-liquid two-phase mixture, cause pump inner flow passage wear, performance by To influence, efficiency reduces, and noise vibration increase, causes fluctuation of service, and then influences the service life of equipment, threatens people's life The quality of production living and the environmentally friendly process of modernization.
The content of the invention
To solve the above mentioned problem of prior art, the invention provides a kind of brand-new blade of semi-open type three without blocking Impeller Hydraulic Design Method, on the one hand perfect existing design scheme, on the other hand more fully considers life and chemical industry Sewage pump working environment, in the particularity and practice for its work easily produced problem design formula has been done it is a large amount of excellent Change.The present invention be able to ensure that half-opened impeller abrasion resistance and efficiently, stably work, strengthen it to harsh environments Adaptability.
Specific embodiment is as follows:
A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three, it is characterised in that:Impeller is three blade semi-open types Impeller form, the impeller surface are coated with the superhard composite coatings of nanometer WC-8Co using HVAF technology, and Provide the design method of impeller main geometric parameters, including impeller outer diameter D2, impeller outlet width b2, blade exit laying angle β2, subtended angle of blade
(1) impeller outer diameter D2
Due to containing fibrous matter, the mud grains of sand in sewage and easily depositing conglomeration material, can be consumed when pump work operates Power bigger than normal, it is as follows in view of the processing of the superhard composite coating of impeller surface, the value of impeller outer diameter in addition:
In formula:
D2- impeller outer diameter, mm;
ns- specific speed;
Q-flow, m3/h;
N-rotating speed, r/min;
(2) impeller outlet width b2
Fully take into account sewage pump work particularity and fluid media (medium) in can contain compared with high concentration of sediment mud, paper scrap and silk scarf The granule mediums such as fragment, the runner of impeller then want wide in range unobstructed so that sewage dirt can effectively pass through.
In formula:
b2- impeller outlet width, mm;
ns- specific speed;
Q-flow, m3/h;
N-rotating speed, r/min;
(3) blade exit laying angle β2
Due to impeller blade exit width take it is wider, and be ensure pump performance curve occur without hump, need to take less Blade exit laying angle.
In formula:
β2- blade exit laying angle, °;
ns- specific speed;
(4) subtended angle of blade
Wherein, the wherein big person of specific speed gets the small value, and the small person of specific speed takes large values;
In formula:
- subtended angle of blade, °;
Beneficial effects of the present invention:
Because the impeller surface using HVAF technology is coated with the superhard composite coatings of nanometer WC-8Co, leaf The erosion resistance of wheel is strong, even if impeller tape solid particle solid-liquid two-phase flow washes away and denuded for a long time, blade and apron plate And the gap of blade and pumping chamber madial wall can be also maintained in small gap, can effectively keep the higher efficiency range of efficiency;Impeller Setting for geometric parameters such as three blade half-opened impeller forms, impeller outlet width, external diameters has taken into full account it to severe The adaptability of working environment, made optimize and adjust, overcome to a certain extent half-opened impeller be not easy to conveying contain bulky grain With the weakness of long stapled medium, it can be ensured that the abrasion resistance of half-opened impeller and efficiently, stably work, greatly enhance leaf The reliability of wheel, and design cost can be reduced and shorten the design cycle.
Brief description of the drawings
The present invention is further described with reference to the accompanying drawings and detailed description:
Fig. 1 is a kind of blade non-clogging impeller axis projection of semi-open type three of one embodiment of the invention;
Fig. 2 is a kind of blade non-clogging impeller plan of semi-open type three of one embodiment of the invention;
In figure;1. impeller outer diameter D2;2. impeller outlet width b2;3. blade exit laying angle β2;4. subtended angle of blade
Embodiment
Fig. 1 and Fig. 2 is respectively axis projection and the plane of the embodiment of three blade non-clogging impeller of semi-open type one of the present invention Figure.
A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three, it is characterised in that:Impeller is three blade semi-open types Impeller form, the impeller surface are coated with the superhard composite coatings of nanometer WC-8Co using HVAF technology, and Provide the design method of impeller main geometric parameters, including impeller outer diameter D2, impeller outlet width b2, blade exit laying angle β2, subtended angle of blade
(5) impeller outer diameter D2
Due to containing fibrous matter, the mud grains of sand in sewage and easily depositing conglomeration material, can be consumed when pump work operates Power bigger than normal, it is as follows in view of the processing of the superhard composite coating of impeller surface, the value of impeller outer diameter in addition:
In formula:
D2- impeller outer diameter, mm;
ns- specific speed;
Q-flow, m3/h;
N-rotating speed, r/min;
(6) impeller outlet width b2
Fully take into account sewage pump work particularity and fluid media (medium) in can contain compared with high concentration of sediment mud, paper scrap and silk scarf The granule mediums such as fragment, the runner of impeller then want wide in range unobstructed so that sewage dirt can effectively pass through.
In formula:
b2- impeller outlet width, mm;
ns- specific speed;
Q-flow, m3/h;
N-rotating speed, r/min;
(7) blade exit laying angle β2
Due to impeller blade exit width take it is wider, and be ensure pump performance curve occur without hump, need to take less Blade exit laying angle.
In formula:
β2- blade exit laying angle, °;
ns- specific speed;
(8) subtended angle of blade
Wherein, the wherein big person of specific speed gets the small value, and the small person of specific speed takes large values;
In formula:
- subtended angle of blade, °;
Protection scope of the present invention is not limited to above-described embodiment, also comprising the other embodiments in the range of present inventive concept and Variation.

Claims (1)

  1. A kind of 1. blade non-clogging impeller Hydraulic Design Method of semi-open type three, it is characterised in that:Impeller is three blade semi-open type leaves Wheel form, the impeller surface is coated with the superhard composite coatings of nanometer WC-8Co using HVAF technology, and carries The design method of impeller main geometric parameters, including impeller outer diameter D are supplied2, impeller outlet width b2, blade exit laying angle β2, Subtended angle of blade
    (1) impeller outer diameter D2
    Due to containing fibrous matter, the mud grains of sand in sewage and easily depositing conglomeration material, can be consumed when pump work operates bigger than normal Power, it is as follows in view of the processing of the superhard composite coating of impeller surface, the value of impeller outer diameter in addition:
    <mrow> <msub> <mi>D</mi> <mn>2</mn> </msub> <mo>=</mo> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mn>118.6</mn> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mn>0.00148</mn> <msub> <mi>n</mi> <mi>s</mi> </msub> </mrow> </msup> <msubsup> <mi>n</mi> <mi>s</mi> <mrow> <mo>-</mo> <mn>0.5</mn> </mrow> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mo>)</mo> </mrow> <mrow> <mn>1</mn> <mo>/</mo> <mn>3</mn> </mrow> </msup> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>60</mn> <mo>~</mo> <mn>120</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn>65.71</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mrow> <mo>-</mo> <mn>0.417</mn> </mrow> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mo>)</mo> </mrow> <mrow> <mn>1</mn> <mo>/</mo> <mn>3</mn> </mrow> </msup> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>120</mn> <mo>~</mo> <mn>210</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>(</mo> <mn>0.00139</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mn>1.5</mn> </msubsup> <mo>-</mo> <mn>0.612</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mn>0.5</mn> </msubsup> <mo>+</mo> <mn>170.5</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mrow> <mo>-</mo> <mn>0.5</mn> </mrow> </msubsup> <mo>)</mo> <msup> <mrow> <mo>(</mo> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mo>)</mo> </mrow> <mrow> <mn>1</mn> <mo>/</mo> <mn>3</mn> </mrow> </msup> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>210</mn> <mo>~</mo> <mn>300</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>1</mn> <mo>)</mo> </mrow> </mrow>
    In formula:
    D2- impeller outer diameter, mm;
    ns- specific speed;
    Q-flow, m3/h;
    N-rotating speed, r/min;
    (2) impeller outlet width b2
    Fully take into account sewage pump work particularity and fluid media (medium) in can contain compared with high concentration of sediment mud, paper scrap and silk scarf fragment Deng granule medium, the runner of impeller then wants wide in range unobstructed so that sewage dirt can effectively pass through.
    <mrow> <msub> <mi>b</mi> <mn>2</mn> </msub> <mo>=</mo> <mfenced open = "{" close = ""> <mtable> <mtr> <mtd> <mrow> <mn>60.74</mn> <msup> <mi>e</mi> <mrow> <mo>-</mo> <mn>0.0015</mn> <msub> <mi>n</mi> <mi>s</mi> </msub> </mrow> </msup> <msup> <mrow> <mo>(</mo> <mfrac> <msub> <mi>n</mi> <mi>s</mi> </msub> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mn>0.95</mn> </msup> <mroot> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mn>3</mn> </mroot> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>60</mn> <mo>~</mo> <mn>120</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mn>34.161</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mn>0.083</mn> </msubsup> <msup> <mrow> <mo>(</mo> <mfrac> <msub> <mi>n</mi> <mi>s</mi> </msub> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mn>0.95</mn> </msup> <mroot> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mn>3</mn> </mroot> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>120</mn> <mo>~</mo> <mn>210</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <mo>(</mo> <mn>0.000728</mn> <msubsup> <mi>n</mi> <mi>s</mi> <mn>2</mn> </msubsup> <mo>-</mo> <mn>0.318</mn> <mo>+</mo> <mn>88.66</mn> <mo>)</mo> <msup> <mrow> <mo>(</mo> <mfrac> <msub> <mi>n</mi> <mi>s</mi> </msub> <mn>100</mn> </mfrac> <mo>)</mo> </mrow> <mn>0.95</mn> </msup> <mroot> <mfrac> <mi>Q</mi> <mi>n</mi> </mfrac> <mn>3</mn> </mroot> <mo>,</mo> </mrow> </mtd> <mtd> <mrow> <mo>(</mo> <msub> <mi>n</mi> <mi>s</mi> </msub> <mo>=</mo> <mn>210</mn> <mo>~</mo> <mn>300</mn> <mo>)</mo> <mo>;</mo> </mrow> </mtd> </mtr> </mtable> </mfenced> <mo>-</mo> <mo>-</mo> <mo>-</mo> <mrow> <mo>(</mo> <mn>2</mn> <mo>)</mo> </mrow> </mrow>
    In formula:
    b2- impeller outlet width, mm;
    ns- specific speed;
    Q-flow, m3/h;
    N-rotating speed, r/min;
    (3) blade exit laying angle β2
    Due to impeller blade exit width take it is wider, and be ensure pump performance curve occur without hump, less blade need to be taken Export laying angle.
    In formula:
    β2- blade exit laying angle, °;
    ns- specific speed;
    (4) subtended angle of blade
    Wherein, the wherein big person of specific speed gets the small value, and the small person of specific speed takes large values;
    In formula:
    - subtended angle of blade, °.
CN201710891726.2A 2017-09-27 2017-09-27 A kind of blade non-clogging impeller Hydraulic Design Method of semi-open type three Withdrawn CN107514385A (en)

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CN110081017A (en) * 2019-04-29 2019-08-02 江苏城乡建设职业学院 A kind of impeller of proof submersible sand discharging pump

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Publication number Priority date Publication date Assignee Title
CN110081017A (en) * 2019-04-29 2019-08-02 江苏城乡建设职业学院 A kind of impeller of proof submersible sand discharging pump
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