CN115559932A - 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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- CN115559932A CN115559932A CN202211065625.7A CN202211065625A CN115559932A CN 115559932 A CN115559932 A CN 115559932A CN 202211065625 A CN202211065625 A CN 202211065625A CN 115559932 A CN115559932 A CN 115559932A
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- cover plate
- blade
- splitter
- blades
- extension
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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 3
- 238000009792 diffusion process Methods 0.000 description 2
- 210000000988 bone and bone Anatomy 0.000 description 1
- 238000005265 energy consumption Methods 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
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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
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
-
- 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 splitter blades, which comprises an extension front cover plate, an extension rear cover plate, long blades and splitter blades, wherein the extension front cover plate extends towards the inlet position of a volute by adopting the molded line outlet edge of the long-blade front cover plate of the pump impeller, and the extension rear cover plate extends towards the inlet position of the volute by adopting the molded line outlet edge of the long-blade rear cover plate of the pump impeller; 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 extended cover plate provided by the invention can effectively reduce the loss of a pump cavity under the operating condition, improves the operating efficiency of the pump, and can improve the flow field distribution in the impeller by arranging the long blades and the short blades at intervals, thereby reducing the pressure pulsation in the impeller flow channel of the pump and achieving the purpose of reducing the noise of the pump.
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 splitter blades.
Background
The mixed-flow centrifugal pump has the advantages of wide range of lift variation, flat power curve, wide high-efficiency area, capability of continuously operating in a small flow range and low possibility of cavitation, and is widely applied to various fields such as agricultural irrigation and drainage, petrochemical industry, metallurgy, aerospace and the like in recent years. However, the front cover plate and the rear cover plate of the mixed-flow water pump impeller are inclined to the axis, the included angle between the rear cover plate and the axial direction is generally 40-80 degrees, so that a larger pump cavity gap exists between the cover plates and the volute, and larger volume loss is caused.
The use of the splitter blade can reduce the blade load, reduce the diffusion of the runner, reduce the separation of the defluidization and boundary layer, reduce the noise of the pump outlet, or reduce the diameter of the impeller under the same lift condition, reduce the energy consumption, raise the efficiency. At present, the design method of the splitter vane pump impeller is mainly used in the field of low specific speed pumps, and the splitter vane of the pump impeller cannot be designed by adopting the design method of the splitter 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 the efficiency of the mixed flow type centrifugal pump, reducing the volume loss of a pump cavity, reducing the diffusion of a flow passage, reducing the flow separation and the boundary layer separation, and reducing the pressure pulsation in the flow passage, thereby reducing the noise of an outlet of the pump.
In order to achieve the purpose, the following technical scheme is adopted:
a cover plate extension type low noise pump impeller with splitter blades comprises: the extension front cover plate, the extension rear cover plate, the long blades and the splitter blades;
the extension front cover plate extends towards the inlet of the volute by adopting the molded line outlet edge of the long-blade front cover plate of the pump impeller;
the extending rear cover plate extends towards the inlet of the volute by adopting the linear outlet edge of the long-blade rear cover plate of the pump impeller;
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 a method of cutting wrap angles, and the designed splitter blades are positioned in a flow channel formed by two adjacent long blades.
The extension front cover plate adopts a structure that the shape line of the long blade outlet front cover plate of the pump impeller extends to the volute inlet position, and the inner arc surface of the extension arc cover plate is tangent with the shape line of the front cover plate at the edge of the blade outlet. Wherein the center position of the molded line of the front cover plate at the outlet of the long blade of the pump impeller is O 2 (x 2 ,y 2 ) The circle center position of the inner arc surface of the extension front cover plate is the same as the circle center position of the molded line of the front cover plate at the outlet of the long blade of the impeller; the radius of the inner circular arc of the extended front cover plate is R s ，
In the formula: d 2a The diameter of a front cover plate at the outlet side of the blade; x is the number of 2 Is the horizontal coordinate of the circular arc center of the front cover plate at the outlet edge of the blade; y is 2 Is the longitudinal coordinate of the circular arc center of the front cover plate at the outlet edge of the blade.
The angle beta between the extended front cover plate and the horizontal position,
in the formula: beta is a 0 The included angle between the outlet edge of the blade and the axis is formed; k is a radical of β 0.1-0.2; n is s In order to obtain the specific number of pump revolutions,
n is a rated rotating speed; q is rated flow; h is pump design head.
The extension back cover plate adopts a structure that the molded line of a long-blade back cover plate of a pump impeller extends from the position of the blade outlet edge to the position of a volute inlet, the initial position of the inner arc line of the extension circular-arc back cover plate is tangent to the molded line of the blade outlet edge back cover plate, the extension arc line of the termination position is tangent to the position of the volute inlet edge, and the central position of the inner arc line of the extension back cover plate is O 3 (x 3 ,y 3 )，
In the formula: x is the number of 1 Is the horizontal coordinate of the circular arc center of the rear cover plate at the outlet edge of the blade;
y 1 is the longitudinal coordinate of the circular arc center of the rear cover plate at the outlet edge of the blade;
b is the distance between the outlet edge of the blade and the origin of coordinates;
b 3 is the volute inlet width;
D 2b the diameter of the rear cover plate at the outlet side of the blade;
D 3 is the base circle diameter;
e is the distance of the center position of the volute inlet deviating from the center position of the impeller outlet;
the included angle beta between the extended rear cover plate and the horizontal position is beta, and the arc radius of the extended rear cover plate is R h ，
The extension front cover plate and the extension rear cover plate are uniformly thickened in an inner arc line offset mode, the thickness is S,
in the formula: k is a radical of s Is the thickness coefficient, k s Is 3 to 25; h is the lift; z is the number of long blades.
The number of the splitter blades
The wrap angle of the long blade is the wrap angle,
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 starting angle of the front cover plate at the inlet edge of the splitter blade is
0.8 to 1.2; the starting angle of the rear cover plate at the inlet edge of the splitter blade is
The splitter blade is biased towards the pressure surface from the suction surface, and the circumferential bias angle of the splitter blade is
k θ Is 0.01-0.06. The inlet edge working face of the splitter blade should be thinned, and the thickness of the thinned inlet edge of the blade is0.4S。
The invention has the advantages that: (1) The cover plate of the pump impeller 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 blade provided by the invention adopts a design method of cutting wrap angles, and can be suitable for the field of the whole vane pump. The splitter blades are arranged at intervals of long blades and short blades, so that the flow field distribution in the impeller can be improved, the pressure pulsation in a runner of the impeller of the pump is reduced, and the aim of reducing the noise of the pump is fulfilled.
Drawings
FIG. 1 is a schematic view of a cover plate extended low noise pump impeller with splitter blades;
FIG. 2 is a schematic view of an extended cover plate according to the present invention;
FIG. 3 is a schematic view of a splitter blade according to the present invention;
FIG. 4 is a schematic view of a pump impeller volute assembly for both the conventional design method (left) and the inventive method (right);
fig. 5 is a graph comparing velocity vectors in the impeller vane volute flow path for the conventional design method (left) and the inventive method (right).
Reference numerals of the above figures: 1. an extended front cover plate; 2. extending the rear cover plate; 3. a long blade; 4. and a splitter blade.
Detailed Description
The invention will be further described with reference to the accompanying fig. 1-5 and the specific embodiments, but the scope of the invention is not limited thereto.
The pump design parameters were as follows: rated flow rate Q =40m 3 H, design head H =14.4m, rated speed n =11200r/min, and specific speed n s ＝583。
As shown in fig. 1, a cover plate extension type pump impeller with splitter blades includes an extension front cover plate, an extension rear cover plate, long blades and splitter blades. The center coordinate of the arc in the front cover plate of the blade is x 2 ＝17.85mm，y 2 =41mm, and the center coordinate of the circular arc of the blade back cover plate is x 1 ＝17.34mm，y 2 =37mm, the distance b between the blade outlet edge and the coordinate origin =6.53mm, and the width b of the volute inlet 3 ＝22.83mm，Diameter D of front cover plate of blade outlet edge 2a =62.2mm, diameter D of rear cover plate of outlet edge of blade 2b =37.64mm; base circle diameter D 3 =72mm; the distance e =3.19mm from the center position of the volute inlet to the center position of the impeller outlet, and the center position of the arc surface circle of the extending rear cover plate is O 2 Is x 3 ＝29.45mm；y 3 =46.22mm; the arc radius of the extended front cover plate is R s =15mm, and the radius of the circular arc of the extended rear cover plate is R h =45.23mm, the angle between the extended cover plate and the horizontal position is β =28.3 °, and the thickness of the extended cover plate is 2mm.
The number of the blades of the pump impeller (the pump impeller only comprises long blades) obtained by the traditional design method is z =3, and the wrap angle of the long blades is taken
The initial angle of the front cover plate at the inlet end of the splitter blade corresponds to the wrap angle value of the long blade
The initial angle of the inlet end back cover plate of the splitter blade corresponds to the wrap angle value of the long blade
The number of the splitter blades is z' =3, the circumferential offset angle of the splitter blades is theta =51 degrees, the thickness of the inlet edge of the splitter blade is 0.8mm, the pressure surface bone line of the splitter blade is similar to that of the long blade, namely the axial surface streamline of the pressure surface at the coaxial position of the splitter blade and the long blade is the same.
As shown in fig. 5, compared with the conventional design method, the cover plate extension type pump impeller with splitter blades has less vortex in the back pump cavity and the volute flow channel, and the outlet speed distribution is more uniform. Numerical simulation shows that the efficiency of the pump of the original design scheme under the rated working condition is 45.65 percent, and the efficiency of the pump designed by the invention under the rated working condition is 57.04 percent; the hydrodynamic noise of the pump of the original design scheme under the characteristic frequency of the volute outlet under the rated working condition is 198dB, and the hydrodynamic noise of the pump adopting the design scheme under the characteristic frequency of the volute outlet under the rated working condition is 186dB.
The embodiments described in this specification are merely illustrative of implementations of the inventive concept and the scope of the present invention should not be considered limited to the specific forms described in the embodiments but includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.
Claims (8)
1. The utility model provides a take apron extension formula low noise pump impeller of splitter blade which characterized in that includes: the extension front cover plate, the extension rear cover plate, the long blades and the splitter blades;
the extension front cover plate extends towards the inlet of the volute by adopting the molded line outlet edge of the long-blade front cover plate of the pump impeller;
the extending rear cover plate extends towards the inlet of the volute by adopting the linear outlet edge of the long-blade rear cover plate of the pump impeller;
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 a method of cutting wrap angles, and the designed splitter blades are positioned in a flow channel formed by two adjacent long blades.
2. The cover plate extension type low-noise pump impeller with the splitter blade according to claim 1, wherein the extension front cover plate adopts a structure that the plate shape of a long blade outlet front cover plate of the pump impeller extends towards the inlet position of the volute, and the inner arc surface of the extension arc cover plate is tangent to the molded line of the front cover plate at the blade outlet edge; wherein the center position of the molded line of the front cover plate at the outlet of the long blade of the pump impeller is O 2 (x 2 ,y 2 ) The circle center position of the inner arc surface of the extension front cover plate is the same as the circle center position of the molded line of the front cover plate at the outlet of the long blade of the impeller; the included angle between the extension front cover plate and the horizontal position is beta, and the radius of the inner circular arc of the extension front cover plate is R s ，
In the formula: d 2a Is the outlet edge of the bladeThe diameter of the front cover plate; x is the number of 2 Is the horizontal coordinate of the circular arc center of the front cover plate at the outlet edge of the blade; y is 2 Is the longitudinal coordinate of the arc center of the front cover plate at the outlet edge of the blade;
the angle beta between the extended front cover plate and the horizontal position,
in the formula: beta is a 0 The included angle between the outlet edge of the blade and the axis is formed; k is a radical of formula β 0.1-0.2; n is s In order to obtain the specific number of pump revolutions,
n is a rated rotating speed; q is rated flow; h is pump design head.
3. The cover plate extension type low-noise pump impeller with splitter blades according to claim 1, wherein the extension 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 blade outlet edge to the position of the volute inlet, the initial position of the inner arc line of the extension back cover plate is tangent to the molded line of the back cover plate at the blade outlet edge, the extension arc line at the termination position is tangent to the inlet edge of the volute, and the center of the inner arc line of the extension back cover plate is O 3 (x 3 ,y 3 )，
In the formula: x is the number of 1 Is the horizontal coordinate of the circular arc center of the rear cover plate at the outlet edge of the blade;
y 1 is the longitudinal coordinate of the circular arc center of the rear cover plate at the outlet edge of the blade;
b is the distance between the outlet edge of the blade and the origin of coordinates;
b 3 is the volute inlet width;
D 2b the diameter of the rear cover plate at the outlet side of the blade;
D 3 is the base circle diameter;
e is the distance of the center position of the volute inlet deviating from the center position of the impeller outlet;
the included angle beta between the extended rear cover plate and the horizontal position is beta, and the arc radius of the extended rear cover plate is R h ，
4. The cover plate extension type low-noise pump impeller with the splitter blade as claimed in claim 1, wherein the extension front cover plate and the extension back cover plate are uniformly thickened in an inner arc line offset manner, and have a thickness of S,
in the formula: k is a radical of s Is the thickness coefficient, k s Is 3 to 25; z is the number of long blades.
5. The splitter-bladed cover-extended low-noise pump impeller of claim 1, wherein the number of splitter blades is
Is a long blade wrap angle;
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.
6. The cover plate extension type low-noise pump impeller with the splitter vane as claimed in claim 1, wherein the splitter vane is designed by a method of cutting a wrap angle, and the inlet edges of the splitter vane are not on the same axial sectional line; the initial angle of the front cover plate at the inlet edge of the splitter blade is
0.8 to 1.2; the initial angle of the inlet edge rear cover plate of the splitter blade is
7. The cover plate extended type low noise pump impeller with splitter blades as claimed in claim 1, wherein said splitter blades are offset from the suction surface to the pressure surface, and the circumferential offset angle of the splitter blades is
k θ Is 0.01-0.06.
8. The cover plate extension type low-noise pump impeller with the splitter blade according to claim 1, wherein the working surface of the inlet side of the splitter blade is thinned, and the thickness of the thinned inlet side of the splitter blade is 0.4S.
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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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| 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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| Publication Number | Publication Date |
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| CN115559932A true CN115559932A (en) | 2023-01-03 |
| CN115559932B 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464664A (en) * | 2023-05-31 | 2023-07-21 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated system and fertilizer pump thereof |
| CN116576151A (en) * | 2023-05-31 | 2023-08-11 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated irrigation and fertilization device |
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| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116464664A (en) * | 2023-05-31 | 2023-07-21 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated system and fertilizer pump thereof |
| CN116576151A (en) * | 2023-05-31 | 2023-08-11 | 江苏大学流体机械温岭研究院 | Water and fertilizer integrated irrigation and fertilization device |
| 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 |
| 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 |
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| Publication number | Publication date |
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| CN115559932B (en) | 2024-03-08 |
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