CN107091245A - Spray centrifugal water pump method for designing impeller - Google Patents
Spray centrifugal water pump method for designing impeller Download PDFInfo
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- CN107091245A CN107091245A CN201710361561.8A CN201710361561A CN107091245A CN 107091245 A CN107091245 A CN 107091245A CN 201710361561 A CN201710361561 A CN 201710361561A CN 107091245 A CN107091245 A CN 107091245A
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- mfrac
- blade
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2272—Rotors specially for centrifugal pumps with special measures for influencing flow or boundary layer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2238—Special flow patterns
- F04D29/2244—Free vortex
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/24—Vanes
- F04D29/242—Geometry, shape
- F04D29/245—Geometry, shape for special effects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/68—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers
- F04D29/688—Combating cavitation, whirls, noise, vibration or the like; Balancing by influencing boundary layers especially adapted for liquid pumps
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Geometry (AREA)
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- Computational Mathematics (AREA)
- Mathematical Analysis (AREA)
- Mathematical Optimization (AREA)
- Pure & Applied Mathematics (AREA)
- Computer Hardware Design (AREA)
- Evolutionary Computation (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Centrifugal water pump method for designing impeller is sprayed the invention discloses one kind, spraying technology processing is carried out to centrifugal water pump impeller inner surface, spraying efficiency of centrifugal pump estimation equation η is corrected, the inlet diameter D to spraying centrifugal pump impellerj, impeller outer diameter D2, impeller outlet width b2, number of blade z and subtended angle of bladeDesign is optimized, the boundary layer of impeller inwall liquid stream, fluid flow pattern can be changed after spraying technology is handled larger change occurs therewith, liquid is turbulent and the small whirlpool of part reduces, and causes the efficiency of pump to occur to be lifted by a relatively large margin；Meanwhile, reduce design cost and the design cycle is greatly shortened, to reach to the more accurate efficient design effect of spraying centrifugal water pump impeller.
Description
Technical field
The invention belongs to fluid machinery design field, centrifugal water pump method for designing impeller is sprayed more particularly, to one kind.
Background technology
Centrifugal water pump is a kind of rotation for supplying other liquid for sending clear water and physicochemical properties to be similar to clear water
Machinery, purposes is widely, it is adaptable to industry and urban water supply and sewerage pump, can be arranged as factory, city, power station and hydraulic engineering etc.
Water or feedwater pump, while available for fields such as field irrigations.But for common clear water centrifugal pump, due to rushing for long-time current
Brush, impeller channel inwall can become rough, coefficient of frictional resistance increase, and loss of flood peak increase causes the efficiency of pump to decline, raised
Situations such as journey is not enough.And centrifugal pump is carried out to centrifugal pump impeller after spraying coating process technical finesse, such case can be prevented effectively from
At the same time it can also make up the defects such as the empty crack of casting that Impeller Machining technique is caused, whole efficiency, the cavitation-resistance of pump are improved
Can, impeller abrasionproof anti-wear effect substantially, extends the service life of product, reduces the frequency that maintenance of equipment updates.
In spraying centrifugal pump, impeller is most important flow passage components, and its effect is with quiet by the mechanical energy in prime mover
The form of pressure energy and kinetic energy is transmitted to liquid, reaches the purpose that liquid is pumped.The whether reasonable in design of impeller is directly connected to spraying
The properties and index of centrifugal water pump.The design and Ordinary Centrifugal Pumps for spraying centrifugal pump impeller are designed with bigger difference,
After spraying technology is handled the boundary layer of impeller inwall and fluid flow pattern occur it is larger change, liquid is turbulent and local small whirlpool
Reduce, cause the efficiency of pump to occur to be lifted by a relatively large margin, so that the design of impeller outer diameter and impeller outlet width etc. and common centrifugation
Pump has larger difference, and traditional design method is no longer applicable.And under the prior art, spray centrifugal pump impeller the Hydraulic Design according to
The experience of designer so is depended on, so as to cause the uncertain big of design, design cost and risk are of a relatively high, it is more difficult to
Meet requirement of the current market to production.
The content of the invention
Centrifugal water pump method for designing impeller is sprayed it is an object of the invention to provide one kind, be can solve the problem that in above mentioned problem
At least one.
According to an aspect of the invention, there is provided a kind of spraying centrifugal water pump method for designing impeller, to centrifugation clear water
Impeller of pump inner surface carries out spraying technology processing, and spraying efficiency of centrifugal pump estimation equation η is corrected, to spraying centrifugal pump
The inlet diameter D of impellerj, impeller outer diameter D2, impeller outlet width b2, number of blade z and subtended angle of bladeDesign is optimized, it is main
To be determined by relationship below：
(1) centrifugal water pump effectiveness formula amendment is sprayed：
In formula：
η-efficiency；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H-lift, m；
(2) impeller inlet diameter：
In formula：
Dj- impeller inlet diameter, mm；
D0- impeller inlet equivalent diameter, mm；
dh- impeller hub diameter, mm；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(3) impeller outlet diameter：
Wherein：
Work as nsWhen=20~120, k is takenD2=1.04~1.26, the small person of specific speed takes large values, otherwise gets the small value；Work as ns=
When 120~300, k is takenD2=1.04~1.08, the big person of specific speed takes large values, otherwise gets the small value；In formula：
D2- impeller outlet diameter, mm；
kD2- external diameter correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(4) impeller outlet width：
Wherein：
Work as nsWhen=20~120, k is takenb2=1.14~2.83, the small person of specific speed takes large values, otherwise gets the small value；Work as ns=
When 120~300, k is takenb2=0.85~1.14, the small person of specific speed takes large values, otherwise gets the small value；In formula：
b2- impeller outlet width, mm；
kb2- exit width correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(5) number of blade：
Z=4~8
Wherein number of blade z chooses according to specific speed；
In formula：
Z-the number of blade；
(6) subtended angle of blade：
In formula：
- subtended angle of blade, is suitably adjusted after calculating according to the number of blade and actual conditions, °；
ns- specific speed；
D2- impeller outlet diameter, mm；
Dj- impeller inlet diameter, mm.
In some embodiments, external diameter correction factor kD2Determine as follows：
Work as nsWhen=20~120：
kD2=-0.118Q0.81n0.31H-0.44+1.56
Work as nsWhen=120~300：
kD2=0.946Q0.53n0.03H-0.72
In formula：
kD2- external diameter correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H- lifts, m.
In some embodiments, exit width correction factor kb2Determine as follows：Work as nsWhen=20~120：
kb2=11.38Q-0.52n-0.02H-1.77+0.825
Work as nsWhen=120~300：
kb2=3.51Q0.18n0.68H-1.07
In formula：
kb2- exit width correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H- lifts, m.
A kind of spraying centrifugal water pump method for designing impeller disclosed by the invention can change leaf after spraying technology is handled
Take turns the boundary layer of inwall liquid stream, fluid flow pattern and larger change occurs therewith, liquid is turbulent and the small whirlpool of part reduces, and causes pump efficiency
Rate occurs to be lifted by a relatively large margin；Meanwhile, reduce design cost and the design cycle is greatly shortened, it is clear to spraying centrifugation to reach
The more accurate efficient design effect of water pump vane.
Brief description of the drawings
Fig. 1 is the structural representation for spraying impeller in centrifugal water pump method for designing impeller of the present invention；
Fig. 2 is the structural representation for spraying another visual angle of impeller of pump in centrifugal water pump method for designing impeller of the present invention
Figure.
Embodiment
The invention will now be described in further detail with reference to the accompanying drawings.
Referring to Figures 1 and 2：The spraying centrifugal water pump method for designing impeller of the present invention, to table in centrifugal water pump impeller
Face carries out spraying technology processing, and wherein spraying technology includes the methods such as HVAF, electric arc spraying and fusing spraying gold
The abrasion-resistant materials such as category, ceramics, due to boundary layer, the fluid flow pattern of impeller inwall liquid stream can be changed after spraying technology is handled
Larger change occurs therewith, liquid is turbulent and the small whirlpool of part reduces, and causes the efficiency of pump to occur to be lifted by a relatively large margin.To spray from
Heart pump efficiency estimation formula η is corrected, the inlet diameter D to spraying centrifugal pump impellerj, impeller outer diameter D2, impeller outlet it is wide
Spend b2, number of blade z and subtended angle of bladeDesign is optimized, is mainly determined by relationship below：
(1) centrifugal water pump effectiveness formula amendment is sprayed：
In formula：
η-efficiency；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H-lift, m；
(2) impeller inlet diameter：
In formula：
Dj- impeller inlet diameter, mm；
D0- impeller inlet equivalent diameter, mm；
dh- impeller hub diameter, mm；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(3) impeller outlet diameter：
Wherein：
It is preferred that, work as nsWhen=20~120, kD2=-0.118Q0.81n0.31H-0.44+1.56；It is preferred that, work as ns=120~
When 300, kD2=0.946Q0.53n0.03H-0.72；
In formula：
D2- impeller outlet diameter, mm；
kD2- external diameter correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(4) impeller outlet width：
Wherein：
It is preferred that, work as nsWhen=20~120, kb2=11.38Q-0.52n-0.02H-1.77+0.825；It is preferred that, work as ns=120
When~300, kb2=3.51Q0.18n0.68H-1.07；
In formula：
b2- impeller outlet width, mm；
kb2- exit width correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(5) number of blade：
Z=4~8
Wherein number of blade z chooses according to specific speed；
In formula：
Z-the number of blade；
(6) subtended angle of blade：
In formula：
- subtended angle of blade, is suitably adjusted after calculating according to the number of blade and actual conditions, °；
ns- specific speed；
D2- impeller outlet diameter, mm；
Dj- impeller inlet diameter, mm.
A kind of spraying centrifugal water pump method for designing impeller disclosed by the invention reduces design cost and is greatly shortened
Design cycle, to reach to the more accurate efficient design effect of spraying centrifugal water pump impeller.
Above-described is only the preferred embodiment of the present invention, it is noted that for one of ordinary skill in the art
For, without departing from the concept of the premise of the invention, various modifications and improvements can be made, these belong to the present invention
Protection domain.
Claims (3)
1. spray centrifugal water pump method for designing impeller, it is characterised in that spraying skill is carried out to centrifugal water pump impeller inner surface
Art processing, is corrected to spraying efficiency of centrifugal pump estimation equation η, the inlet diameter D to spraying centrifugal pump impellerj, impeller
Outer diameter D2, impeller outlet width b2, number of blade z and subtended angle of bladeDesign is optimized, is mainly determined by relationship below：
(1) centrifugal water pump effectiveness formula amendment is sprayed：
<mrow>
<mi>&eta;</mi>
<mo>=</mo>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mn>0.966</mn>
<mo>-</mo>
<mn>0.561</mn>
<msup>
<mi>Q</mi>
<mrow>
<mo>-</mo>
<mn>0.265</mn>
</mrow>
</msup>
<mo>-</mo>
<mn>0.69</mn>
<msup>
<mi>e</mi>
<mrow>
<mo>-</mo>
<mn>0.0383</mn>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
</mrow>
</msup>
<mo>,</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<mn>20</mn>
<mo>~</mo>
<mn>120</mn>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mn>0.966</mn>
<mo>-</mo>
<mn>0.561</mn>
<msup>
<mi>Q</mi>
<mrow>
<mo>-</mo>
<mn>0.265</mn>
</mrow>
</msup>
<mo>,</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<mn>120</mn>
<mo>~</mo>
<mn>210</mn>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mn>1.054</mn>
<mo>-</mo>
<mn>0.561</mn>
<msup>
<mi>Q</mi>
<mrow>
<mo>-</mo>
<mn>0.265</mn>
</mrow>
</msup>
<mo>-</mo>
<mn>0.0011</mn>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>,</mo>
<mrow>
<mo>(</mo>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<mn>210</mn>
<mo>-</mo>
<mn>300</mn>
<mo>)</mo>
</mrow>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
</mrow>
<mrow>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<mn>3.65</mn>
<mi>n</mi>
<msqrt>
<mi>Q</mi>
</msqrt>
</mrow>
<msup>
<mi>H</mi>
<mn>0.75</mn>
</msup>
</mfrac>
</mrow>
In formula：
η-efficiency；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H-lift, m；
(2) impeller inlet diameter：
<mrow>
<msub>
<mi>D</mi>
<mi>j</mi>
</msub>
<mo>=</mo>
<msqrt>
<mrow>
<msubsup>
<mi>D</mi>
<mn>0</mn>
<mn>2</mn>
</msubsup>
<mo>+</mo>
<msubsup>
<mi>d</mi>
<mi>h</mi>
<mn>2</mn>
</msubsup>
</mrow>
</msqrt>
</mrow>
<mrow>
<msub>
<mi>D</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mn>3.6</mn>
<mo>+</mo>
<mn>0.37</mn>
<msubsup>
<mi>n</mi>
<mi>s</mi>
<mn>0.18</mn>
</msubsup>
<mo>)</mo>
</mrow>
<mroot>
<mfrac>
<mi>Q</mi>
<mi>n</mi>
</mfrac>
<mn>3</mn>
</mroot>
</mrow>
In formula：
Dj- impeller inlet diameter, mm；
D0- impeller inlet equivalent diameter, mm；
dh- impeller hub diameter, mm；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(3) impeller outlet diameter：
<mrow>
<msub>
<mi>D</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mn>87.05</mn>
<msub>
<mi>k</mi>
<mrow>
<mi>D</mi>
<mn>2</mn>
</mrow>
</msub>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mn>1.03</mn>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>590</mn>
</mrow>
<mrow>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>593.3</mn>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<msubsup>
<mi>n</mi>
<mi>s</mi>
<mrow>
<mo>-</mo>
<mn>0.5</mn>
</mrow>
</msubsup>
<mroot>
<mfrac>
<mi>Q</mi>
<mi>n</mi>
</mfrac>
<mn>3</mn>
</mroot>
</mrow>
Wherein：
Work as nsWhen=20~120, k is takenD2=1.04~1.26, the small person of specific speed takes large values, otherwise gets the small value；
Work as nsWhen=120~300, k is takenD2=1.04~1.08, the big person of specific speed takes large values, otherwise gets the small value；
In formula：
D2- impeller outlet diameter, mm；
kD2- external diameter correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(4) impeller outlet width：
<mrow>
<msub>
<mi>b</mi>
<mn>2</mn>
</msub>
<mo>=</mo>
<mrow>
<mo>(</mo>
<mfrac>
<mrow>
<mn>5.98</mn>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>1200</mn>
</mrow>
<mrow>
<msub>
<mi>n</mi>
<mi>s</mi>
</msub>
<mo>+</mo>
<mn>194.5</mn>
</mrow>
</mfrac>
<mo>)</mo>
</mrow>
<msub>
<mi>k</mi>
<mrow>
<mi>b</mi>
<mn>2</mn>
</mrow>
</msub>
<msubsup>
<mi>n</mi>
<mi>s</mi>
<mrow>
<mn>5</mn>
<mo>/</mo>
<mn>6</mn>
</mrow>
</msubsup>
<mroot>
<mfrac>
<mi>Q</mi>
<mi>n</mi>
</mfrac>
<mn>3</mn>
</mroot>
</mrow>
Wherein：
Work as nsWhen=20~120, k is takenb2=1.14~2.83, the small person of specific speed takes large values, otherwise gets the small value；
Work as nsWhen=120~300, k is takenb2=0.85~1.14, the small person of specific speed takes large values, otherwise gets the small value；
In formula：
b2- impeller outlet width, mm；
kb2- exit width correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
(5) number of blade：
Z=4~8
Wherein number of blade z chooses according to specific speed；
In formula：
Z-the number of blade；
(6) subtended angle of blade：
In formula：
- subtended angle of blade, is suitably adjusted after calculating according to the number of blade and actual conditions, °；
ns- specific speed；
D2- impeller outlet diameter, mm；
Dj- impeller inlet diameter, mm.
2. spraying centrifugal water pump method for designing impeller according to claim 1, it is characterised in that the external diameter amendment system
Number kD2Determine as follows：
Work as nsWhen=20~120：
kD2=-0.118Q0.81n0.31H-0.44+1.56
Work as nsWhen=120~300：
kD2=0.946Q0.53n0.03H-0.72
In formula：
kD2- external diameter correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H- lifts, m.
3. spraying centrifugal water pump method for designing impeller according to claim 2, it is characterised in that the exit width is repaiied
Positive coefficient kb2Determine as follows：
Work as nsWhen=20~120：
kb2=11.38Q-0.52n-0.02H-1.77+0.825
Work as nsWhen=120~300：
kb2=3.51Q0.18n0.68H-1.07
In formula：
kb2- exit width correction factor；
ns- specific speed；
Q-flow, m3/h；
N-rotating speed, r/min；
H- lifts, m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361561.8A CN107091245A (en) | 2017-05-19 | 2017-05-19 | Spray centrifugal water pump method for designing impeller |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710361561.8A CN107091245A (en) | 2017-05-19 | 2017-05-19 | Spray centrifugal water pump method for designing impeller |
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| CN107091245A true CN107091245A (en) | 2017-08-25 |
Family
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023070774A1 (en) * | 2021-10-31 | 2023-05-04 | 浙江水泵总厂有限公司 | Impeller inlet structure and centrifugal pump having same |
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