CN115559932B - Cover plate extension type low-noise pump impeller with splitter blades - Google Patents
Cover plate extension type low-noise pump impeller with splitter blades Download PDFInfo
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- CN115559932B CN115559932B CN202211065625.7A CN202211065625A CN115559932B CN 115559932 B CN115559932 B CN 115559932B CN 202211065625 A CN202211065625 A CN 202211065625A CN 115559932 B CN115559932 B CN 115559932B
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- cover plate
- blade
- blades
- splitter
- front cover
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- 238000000034 method Methods 0.000 claims abstract description 14
- 230000010349 pulsation Effects 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 description 4
- 210000000988 bone and bone Anatomy 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 241000510678 Falcaria vulgaris Species 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002262 irrigation Effects 0.000 description 1
- 238000003973 irrigation Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- 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
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
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- 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
-
- 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
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
Abstract
The invention discloses a cover plate extension type low-noise pump impeller with a splitter blade, which comprises four parts, namely an extension front cover plate, an extension rear cover plate, a long blade and a splitter blade, wherein the extension front cover plate extends to the position of a volute inlet by adopting the profile outlet edge of the pump impeller long blade front cover plate, and the extension rear cover plate extends to the position of the volute inlet by adopting the profile outlet edge of the pump impeller long blade rear cover plate; the long blades and the splitter blades are twisted blades, wherein the long blades are uniformly distributed in the circumferential direction of the impeller, and the splitter blades are designed by adopting a method of cutting wrap angles. The extension cover plate provided by the invention can effectively reduce the pump cavity loss under the operating condition, improve the operating efficiency of the pump, and improve the flow field distribution in the impeller by arranging long and short blades at intervals, thereby reducing the pressure pulsation in the impeller flow channel of the pump and achieving the purpose of reducing the pump noise.
Description
Technical Field
The invention belongs to the field of centrifugal pump design, and particularly relates to a cover plate extension type low-noise pump impeller with flow dividing blades.
Background
The mixed flow centrifugal pump has the advantages of wide range of lift variation, flat power curve, wide high-efficiency area, continuous operation in a small flow range and difficult cavitation, and is widely applied to various fields of agricultural drainage and irrigation, petrochemical industry, metallurgy, aerospace and the like in recent years. But the front cover plate and the rear cover plate of the mixed flow water pump impeller are inclined with the axis, and the included angle between the rear cover plate and the axis is generally 40-80 degrees, so that a larger pump cavity gap exists between the cover plate and the volute, larger volume loss is caused, fluid at the outlet of the vane can be uniformly guided to the position of the volute or the inlet of the guide vane by extending the cover plate, the leakage loss of the pump cavity is effectively reduced, and the pump lift, the efficiency and the operation stability are improved.
The use of the splitter blades can reduce blade load, reduce the diffusion of the flow channels, reduce the flow separation and boundary layer separation, reduce pump outlet noise, or reduce impeller diameter under the same lift condition, reduce energy consumption and improve efficiency. At present, the design method of the split-vane pump impeller is mainly in the field of low-specific-speed pumps, and the split-vane of the pump impeller cannot be designed by adopting the design method of the split-vane of the low-specific-speed pump impeller because the shape of the pump impeller is greatly different from that of the low-specific-speed pump impeller.
Disclosure of Invention
The invention is provided for improving the lift and efficiency of a mixed flow centrifugal pump, reducing the volume loss of a pump cavity, reducing the diffusion of a flow channel, reducing the separation of a flow separation layer and a boundary layer, and reducing the pressure pulsation in the flow channel, thereby reducing the noise of a pump outlet.
In order to achieve the above purpose, the following technical scheme is adopted:
a shroud-extending low noise pump impeller with splitter blades comprising: an extended front cover plate, an extended rear cover plate, a long blade and a splitter blade;
the extending front cover plate extends to the volute inlet position by adopting the molded line outlet edge of the pump impeller long-blade front cover plate;
the extended back cover plate extends to the volute inlet position by adopting the molded line outlet edge of the pump impeller long-blade back cover plate;
the long blades and the splitter blades are twisted blades, the long blades are uniformly distributed in the circumferential direction of the impeller, the splitter blades are designed by adopting a method of cutting wrap angles, and the designed splitter blades are positioned in a flow channel formed by two adjacent long blades.
The extending front cover plate adopts a structure that the profile of the front cover plate of the long blade outlet of the pump impeller extends to the position of the volute inlet, and the inner cambered surface of the extending circular arc cover plate is tangent to the profile of the front cover plate of the blade outlet side. Wherein the circle center position of the front cover plate molded line of the long blade outlet of the pump impeller is O 2 (x 2 ,y 2 ) The circle center position of the inner cambered surface of the extended front cover plate is the same as the circle center position of the molded line of the front cover plate of the impeller long blade outlet; the inner arc radius of the extending front cover plate is R s ，
Wherein: d (D) 2a The diameter of the front cover plate of the outlet edge of the blade; x is x 2 The circular arc circle center abscissa of the front cover plate at the outlet side of the blade; y is 2 Is the ordinate of the circle center of the arc of the front cover plate at the outlet side of the blade.
The included angle beta between the extending front cover plate and the horizontal position,
wherein: beta 0 The included angle between the outlet edge of the blade and the axis is formed; k (k) β 0.1-0.2; n is n s For the number of pump specific revolutions,n is the rated rotation speed; q is rated flow; h is the pump design head.
The extending back cover plate adopts a structure that the molded line of the long-blade back cover plate of the pump impeller extends from the position of the outlet edge of the blade to the position of the inlet of the volute, the initial position of the inner arc line of the extending arc back cover plate is tangent with the molded line of the back cover plate of the outlet edge of the blade, the extension arc line of the termination position is tangent with the inlet edge of the volute, and the center position of the inner arc line of the extending back cover plate is O 3 (x 3 ,y 3 )，
Wherein: x is x 1 The circular arc circle center abscissa of the rear cover plate at the outlet side of the blade;
y 1 is the ordinate of the circle center of the arc of the rear cover plate at the outlet side of the blade;
b is the distance between the outlet edge of the blade and the origin of coordinates;
b 3 the width of the inlet of the volute is the width;
D 2b the diameter of the rear cover plate of the outlet edge of the blade;
D 3 is the base circle diameter;
e is the distance between the center position of the volute inlet and the center position of the impeller outlet;
the included angle beta between the extended back cover plate and the horizontal position is that the arc radius of the extended back cover plate is R h ，
The extending front cover plate and the extending rear cover plate are uniformly thickened in an inner arc deviation mode, the thickness is S,
wherein: k (k) s Is the thickness coefficient, k s 3-25; h is the lift; z is the number of long blades.
The number of the splitter blades For the wrap angle of long leaf, the->The initial angle of the front cover plate at the inlet edge of the splitter blade corresponds to the wrap angle of the long blade.
The splitter blade is designed by adopting a method of cutting wrap angles, and the inlet edges of the splitter blade are not on the same axial plane section line. The front cover plate of the inlet edge of the splitter blade has the initial angle of 0.8-1.2; the start angle of the rear cover plate of the inlet side of the splitter blade is +.>
The splitter blade is biased towards the pressure surface by a suction surface, and the circumferential bias angle of the splitter blade is thatk θ 0.01-0.06. The working face of the inlet edge of the splitter blade is thinned, and the thickness of the thinned inlet edge of the blade is 0.4S.
The invention has the advantages that: (1) The pump impeller cover plate provided by the invention extends from the blade outlet to the volute inlet; the pump cavity loss can be effectively reduced under the operation working condition, and the operation efficiency of the pump is improved. (2) The splitter vane provided by the invention adopts a design method of splitting wrap angles, and can be applied to the field of the whole vane pump. The splitter blades are arranged at intervals of long and short blades, so that the flow field distribution inside the impeller can be improved, the pressure pulsation in the impeller flow channel of the pump is reduced, and the purpose of reducing the pump noise is achieved.
Drawings
FIG. 1 is a schematic view of a shroud-extending low noise pump impeller with splitter blades;
FIG. 2 is a schematic view of an extension cover plate of the present invention;
FIG. 3 is a schematic view of a splitter vane according to the present invention;
FIG. 4 is a schematic diagram of a conventional design method (left) and a method (right) of the pump impeller volute assembly of the present invention;
fig. 5 is a graph comparing velocity vectors in the impeller vane volute flow path of the conventional design method (left) and the method (right) of the present invention.
Reference numerals of the above drawings: 1. extending the front cover plate; 2. extending the back cover plate; 3. a long blade; 4. and a splitter blade.
Detailed Description
The invention will be further described with reference to the accompanying figures 1-5 and the examples, but the scope of the invention is not limited thereto.
The pump design parameters were as follows: rated flow q=40m 3 /H, design head h=14.4m, nominal rotational speed n=11200r/min, specific rotational speed n s ＝583。
As shown in FIG. 1, a shroud-extending, splitter-bladed pump impeller includes an extending front shroud, an extending rear shroud, long blades, and splitter blades. The center coordinates of the circular arcs in the front cover plate of the blade are x 2 ＝17.85mm，y 2 The center coordinates of the inner arc of the rear cover plate of the blade are x 1 ＝17.34mm，y 2 Distance of blade exit edge from origin of coordinates b=6.53 mm, =37 mm, volute entrance width b 3 Blade exit side front cover diameter D =22.83 mm 2a Blade exit edge back plate diameter D =62.2 mm 2b =37.64 mm; base circle diameter D 3 =72 mm; the center position of the volute inlet deviates from the center position of the impeller outlet by a distance e=3.19 mm, and the circle center position of the intrados of the extended rear cover plate is O 2 Is x 3 ＝29.45mm；y 3 = 46.22mm; the radius of the arc of the extending front cover plate is R s =15 mm, the radius of the arc of the extended back cover plate is R h The angle between the extended back cover plate and the horizontal position is = 45.23mm, the angle between the extended back cover plate and the horizontal position is β=28.3°, and the thickness of the extended back cover plate is 2mm.
The number z=3 of the blades of the pump impeller (the pump impeller only comprising long blades) obtained by the traditional design method, and the wrap angle of the long blades takes a valueThe value of the initial angle of the front cover plate of the inlet end of the splitter blade corresponding to the wrap angle of the long blade>The value of the initial angle of the inlet end rear cover plate of the splitter blade corresponding to the wrap angle of the long blade>The number z' =3 of the splitter blades, the circumferential offset angle of the splitter blades is θ=51°, the thickness of the inlet edge of the splitter blade is 0.8mm, and the pressure surface bone line of the splitter blade is similar to the bone line of the long blade, namely, the axial surface flow lines of the pressure surfaces of the splitter blade and the long blade which are coaxially positioned are the same.
As shown in FIG. 5, compared with the traditional design method, the cover plate extension type pump impeller with the splitter blades has fewer eddies in the rear pump cavity and the volute flow passage, and the outlet speed distribution is more uniform. The efficiency of the pump of the original design scheme under the rated working condition is found to be 45.65% through numerical simulation, and the efficiency of the pump designed by the invention under the rated working condition is found to be 57.04%; the hydrodynamic noise of the pump in the original design scheme at the characteristic frequency of the outlet of the volute under the rated working condition is 198dB, and the hydrodynamic noise of the pump in the design of the invention at the characteristic frequency of the outlet of the volute under the rated working condition is 186dB.
The embodiments described in the present specification are merely examples of implementation forms of the inventive concept, and the scope of protection of the present invention should not be construed as being limited to the specific forms described in the embodiments, but also includes equivalent technical means that can be conceived by those skilled in the art according to the inventive concept.
Claims (6)
1. A shroud-extending low noise pump impeller with splitter blades, comprising: an extended front cover plate, an extended rear cover plate, a long blade and a splitter blade;
the extending front cover plate extends to the volute inlet position by adopting the molded line outlet edge of the pump impeller long-blade front cover plate;
the extended back cover plate extends to the volute inlet position by adopting the molded line outlet edge of the pump impeller long-blade back cover plate;
the long blades and the splitter blades are twisted blades, the long blades are uniformly distributed in the circumferential direction of the impeller, the splitter blades are designed by adopting a method of cutting wrap angles, and the designed splitter blades are positioned in a flow channel formed by two adjacent long blades;
the extending front cover plate adopts a structure that the molded line of the front cover plate of the long blade outlet of the pump impeller extends to the position of the volute inlet, and the inner cambered surface of the extending circular arc cover plate is tangent to the molded line of the front cover plate of the blade outlet side; wherein the circle center position of the front cover plate molded line of the long blade outlet of the pump impeller is O 2 (x 2 ,y 2 ) The circle center position of the inner cambered surface of the extending front cover plate is the same as the circle center position of the molded line of the front cover plate of the impeller long blade outlet; the included angle between the extending front cover plate and the horizontal position is beta, and the inner arc radius of the extending front cover plate is R s ，
Wherein: d (D) 2a The diameter of the front cover plate of the outlet edge of the blade; x is x 2 The circular arc circle center abscissa of the front cover plate at the outlet side of the blade; y is 2 Is the ordinate of the circle center of the arc of the front cover plate at the outlet side of the blade;
the included angle beta between the extending front cover plate and the horizontal position,
wherein: beta 0 The included angle between the outlet edge of the blade and the axis is formed; k (k) β 0.1-0.2; n is n s For the number of pump specific revolutions,n is the rated rotation speed; q is rated flow; h is the pump design lift;
the extending back cover plate adopts a structure that the molded line of the pump impeller long-blade back cover plate extends from the position of the blade outlet edge to the position of the volute inlet, and extendsThe initial position of the inner arc of the back cover plate is tangent to the profile of the back cover plate at the outlet side of the blade, the extension arc of the end position is tangent to the inlet side of the volute, and the center position of the inner arc of the extension back cover plate is O 3 (x 3 ,y 3 )，
Wherein: x is x 1 The circular arc circle center abscissa of the rear cover plate at the outlet side of the blade;
y 1 is the ordinate of the circle center of the arc of the rear cover plate at the outlet side of the blade;
b is the distance between the outlet edge of the blade and the origin of coordinates;
b 3 the width of the inlet of the volute is the width;
D 2b the diameter of the rear cover plate of the outlet edge of the blade;
D 3 is the base circle diameter;
e is the distance between the center position of the volute inlet and the center position of the impeller outlet;
the included angle beta between the extended back cover plate and the horizontal position is that the arc radius of the extended back cover plate is R h ，
2. The cover plate extension type low noise pump impeller with the splitter blades according to claim 1, wherein the extension front cover plate and the extension rear cover plate are uniformly thickened in an inner arc deviation mode, the thickness is S,
wherein: k (k) s Is the thickness coefficient, k s 3-25; z is the number of long blades.
3. The shroud-extending low noise pump impeller with splitter blades of claim 2, wherein said splitter blades have a blade count The wrap angle of the long blade is formed; />The initial angle of the front cover plate at the inlet edge of the splitter blade corresponds to the wrap angle of the long blade.
4. A cover plate extension type low noise pump impeller with a splitter blade according to claim 3, wherein the splitter blade is designed by adopting a method of splitting wrap angles, and the inlet edges of the splitter blade are not on the same axial plane section line; the front cover plate of the inlet edge of the splitter blade has the initial angle of 0.8-1.2; the inlet side back cover plate of the splitter blade has an initial angle of +.>
5. The shroud-extending low noise pump impeller with splitter blades of claim 4, wherein said splitter blades are biased by suction toward the pressure face, splittingThe circumferential offset angle of the blade isk θ 0.01-0.06.
6. The cover plate extension type low noise pump impeller with splitter blades according to claim 2, wherein the working surface of the inlet side of the splitter blades is thinned, and the thickness of the thinned inlet side of the blades is 0.4S.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211065625.7A CN115559932B (en) | 2022-09-01 | 2022-09-01 | Cover plate extension type low-noise pump impeller with splitter blades |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211065625.7A CN115559932B (en) | 2022-09-01 | 2022-09-01 | Cover plate extension type low-noise pump impeller with splitter blades |
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| CN115559932A CN115559932A (en) | 2023-01-03 |
| CN115559932B true CN115559932B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211065625.7A Active CN115559932B (en) | 2022-09-01 | 2022-09-01 | Cover plate extension type low-noise pump impeller with splitter blades |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464664B (en) * | 2023-05-31 | 2024-04-02 | 台州科技职业学院 | Water and fertilizer integrated system and fertilizer pump thereof |
| CN116576151B (en) * | 2023-05-31 | 2024-03-08 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated irrigation and fertilization device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210682U (en) * | 1986-12-29 | 1987-10-07 | 中国科学院工程热物理研究所 | Centrifugal pump |
| CN106640667A (en) * | 2017-03-02 | 2017-05-10 | 中国农业大学 | Flow diversion shell type double-stage double-suction centrifugal pump |
| CN109915418A (en) * | 2019-03-18 | 2019-06-21 | 江苏大学 | A kind of blade extension type vertical centrifugal pump airflow fence and the centrifugal pump using the airflow fence |
| CN210290254U (en) * | 2019-06-06 | 2020-04-10 | 南方泵业股份有限公司 | Centrifugal impeller with splitter blades |
| CN116624423A (en) * | 2022-07-14 | 2023-08-22 | 利欧集团浙江泵业有限公司 | Efficient stamping impeller |
-
2022
- 2022-09-01 CN CN202211065625.7A patent/CN115559932B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86210682U (en) * | 1986-12-29 | 1987-10-07 | 中国科学院工程热物理研究所 | Centrifugal pump |
| CN106640667A (en) * | 2017-03-02 | 2017-05-10 | 中国农业大学 | Flow diversion shell type double-stage double-suction centrifugal pump |
| CN109915418A (en) * | 2019-03-18 | 2019-06-21 | 江苏大学 | A kind of blade extension type vertical centrifugal pump airflow fence and the centrifugal pump using the airflow fence |
| CN210290254U (en) * | 2019-06-06 | 2020-04-10 | 南方泵业股份有限公司 | Centrifugal impeller with splitter blades |
| CN116624423A (en) * | 2022-07-14 | 2023-08-22 | 利欧集团浙江泵业有限公司 | Efficient stamping impeller |
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| CN115559932A (en) | 2023-01-03 |
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