CN107120307A - The centrifugal pump impeller of back blades is distorted with import - Google Patents
The centrifugal pump impeller of back blades is distorted with import Download PDFInfo
- Publication number
- CN107120307A CN107120307A CN201710541106.6A CN201710541106A CN107120307A CN 107120307 A CN107120307 A CN 107120307A CN 201710541106 A CN201710541106 A CN 201710541106A CN 107120307 A CN107120307 A CN 107120307A
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- China
- Prior art keywords
- blades
- import
- back blades
- primary
- primary blades
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
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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
- 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
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention discloses a kind of centrifugal pump impeller that back blades is distorted with import, including the impeller hub being connected with pump shaft key and some primary blades being distributed on wheel hub.The quantity import distortion back blades equal with primary blades quantity is additionally provided with wheel hub, import distortion back blades is located in front of primary blades leading edge, both overlap distances in axial direction are 0 ~ 10mm, it it is 5 ~ 20 ° in both circumferential overlapping angles, gap is 1 ~ 10mm between adjacent back blades and primary blades, import distortion back blades entrance angle is 20 ~ 40 °, and the entrance angle of primary blades is 25 ~ 50 °.Main flow is distorted after back blades by import, along blade gap, is streamed primary blades to impact smaller mode, is improved primary blades inlet flow, reduces vane inlet exclusion；Fluid supplements energy for main blade suction surface, prevents primary blades entry zone flow separation along blade gap simultaneously, and plays wake zone effect of washing away, and reduction wake zone energy loss improves performance of centrifugal pump.
Description
Technical field
The present invention relates to centrifugal water pump technical field, more particularly to a kind of centrifugal pump leaf that back blades is distorted with import
Wheel.
Background technology
Centrifugal water pump is a kind of relatively low vane pump of specific speed, and it has the characteristics of flow is small, lift is high, extensively
Apply field irrigation, control flood and drain flooded fields, municipal water supply, power plant's water circulation, chemical industry, traffic, the field such as hydraulic engineering.Ordinary circumstance
Under, because centrifugal pump impeller is in diffused, interior flow field is complicated, as shown in figure 1, often with flow separation, vortex, secondary
The flow phenomenon such as stream and backflow, these phenomenons directly affect centrifugal pump interior flow field and are distributed and consume energy, produce simultaneously
Whirlpool may also plug runner, ultimately result in efficiency of centrifugal pump reduction.Particularly under off-design behaviour, these bad streams
It is dynamic to be further exacerbated by, while inducing the generation of other flow instabilities phenomenons, have a strong impact on the safety and stability fortune of water pump system
OK.
The vane inlet of centrifugal water pump is designed to spatial warping type, can better adapt to the flowing of impeller inlet needs
Will.By flowing the means of control, and spatial warping type blade is combined, design one kind is effectively controlled under multi-state service condition
The centrifugal pump impeller of blade surface boundary layer separation, has important application valency for widening the effective condition range of centrifugal water pump
Value.
The content of the invention
The technical problem existed it is an object of the invention to solve prior art carries import there is provided one kind and distorts back blades
Centrifugal pump impeller, the centrifugal pump impeller can effectively control the flow separation that centrifugal blade under multi-state is produced, reduce not
The resistance that steady flow is produced, improves the operating efficiency and operation stability of centrifugal water pump.
To reach above-mentioned purpose, the present invention uses following technical scheme：
A kind of centrifugal pump impeller that back blades is distorted with import, including the impeller hub that is connected with pump shaft key and be distributed in
Some primary blades on wheel hub, it is characterised in that：The quantity import distortion equal with primary blades quantity is additionally provided with the wheel hub
Back blades.
The import distortion back blades and the structurally independent design of primary blades, and import distortion back blades trailing edge and main lobe
Piece leading edge is axially having certain overlap distance, is circumferentially having certain overlapping angle, is having between adjacent back blades and primary blades
There is certain gap.
The import distortion back blades is located at the front of primary blades leading edge, the phase between import distortion back blades and primary blades
To position (on the basis of front side of vane), both overlap distances in axial direction are 0~10mm, in both circumferential overlapping angles
For 5~20 °, 1~10mm of gap length between adjacent back blades and primary blades.
The import distortion back blades entrance angle is 20~40 °.
The entrance angle of the primary blades is 25~50 °.
The thickness at the end that becomes a mandarin of the import distortion back blades of the present invention is less than or equal to the thickness at stream end, if needed may be used
Carry out space rounding processing.
The present invention compared with prior art, enters with following obvious prominent substantive distinguishing features and notable technology
Step：
The Hydraulic Design of conventional centrifugal pump impeller blade is divided into primary blades and import and distorts back blades by the present invention, using entering
The drainage of mouth distortion back blades, guide functions so that main flow is distorted after back blades by import, along blade gap, to impact
Less mode streams primary blades, improves the flowing of vane inlet, reduces the exclusion of vane inlet；Fluid is along leaf simultaneously
Gap between piece, energy is supplemented for main blade suction surface, prevents primary blades entry zone from occurring flow separation, and play and wash away main lobe
The effect of piece wake zone, reduces the energy loss of wake zone.As shown in Fig. 2 can be seen that from the flow field of preferred example of the present invention
For the conventional centrifugal impeller of pump under identical operating condition, using the centrifugal pump impeller of the present invention, hence it is evident that inhibit runner whirlpool
The development in area, souring is played to wake zone, so as to reduce due to the energy loss that flow separation is produced, improves blade
Operating efficiency, so as to improve the hydraulic performance of centrifugal water pump.
Brief description of the drawings
Fig. 1 is the schematic diagram that whirlpool distribution occurs in conventional centrifugal pump impeller blade wake zone.
Fig. 2 is the schematic diagram that back blades centrifugal pump impeller suppression whirlpool flow field is distorted with import of the present invention.
Fig. 3 is the structural representation for one preferred example of centrifugal pump impeller of pump that the present invention distorts back blades with import.
Fig. 4 is the design process schematic diagram that import distorts back blades.
Fig. 5 is import distortion back blades and the three-dimensional modeling figure of primary blades.
Fig. 6 is to be compared using the centrifugal pump impeller product after the present invention with the cavitation performance under original three flows of impeller.
Embodiment
Details are as follows for the preferred embodiments of the present invention combination accompanying drawing：
Embodiment one：
Referring to Fig. 2, Fig. 3, Fig. 4 and Fig. 5, this distorts the centrifugal pump impeller of back blades with import, including connects with pump shaft key
The impeller hub 3 connect and some primary blades 8 being distributed on wheel hub 3, it is characterised in that：Be additionally provided with the wheel hub 3 quantity with
The equal import distortion back blades 7 of primary blades quantity.The import distortion back blades 7 and the structurally independent design of primary blades 8,
And the import distortion trailing edge of back blades 7 has the overlap distance of setting in axial direction with the leading edge of primary blades 8, in the angle overlap for circumferentially having setting
Degree；There is the gap of setting between adjacent back blades 7 and primary blades 8.Embodiment two：
The present embodiment and embodiment one are essentially identical, and special feature is as follows：
The import distortion back blades is located at the front of the leading edge of primary blades 8, between import distortion back blades 7 and primary blades 8
Relative position, on the basis of front side of vane, both overlap distances in axial direction are 0~10mm, and both are overlapping circumferential
Angle is 5~20 °, 1~10mm of gap length between adjacent back blades 7 and primary blades 8；The import distorts the import of back blades 7
Angle is 20~40 °；The entrance angle of the primary blades 8 is 25~50 °；The thickness at the end that becomes a mandarin of described import distortion back blades
Degree is less than or equal to the thickness at stream end.
Embodiment three：
Referring to Fig. 3, Fig. 4 and Fig. 5, import distortion back blades centrifugal pump impeller, including front shroud 1, back shroud 2 and pump shaft
The wheel hub 3 and the primary blades 8 that are distributed on wheel hub 3 of key connection, the quantity of primary blades 8 can for three, four or other quantity,
Blade quantity is mainly selected according to the design requirement of pump.Import distortion back blades 7 be located at primary blades 8 front end, and both
It is equal in quantity.
The present invention impeller can for grease sand, resin sand or paste gold sand casting impeller, or hot investment casting impeller,
Can be intermetallic composite coating impeller or welding impeller.
Can be using being designed by way of splitting, i.e., suitably being contracted to ready-made blade basis in the structure of primary blades 8
Short ready-made length of blade, and its entrance angle is suitably adjusted, so as to form new impeller primary blades.
Import distorts back blades 7 by selecting suitable back blades cornerite, import laying angle, outlet laying angle, draws three
Bar spatial streamline, fitting generation distortion back blades working face, thickeies to working face, ultimately generates and form one between primary blades 8
Determine the import distortion back blades of spatial joint clearance.
Import distorts the parameter selection range of back blades 7：40~50 ° of cornerite scope, 15~30 ° of import laying angle, outlet
20~30 ° of laying angle, both overlap distances of import distortion back blades 7 and primary blades 8 in axial direction are 0~10mm, in circumference
Both overlapping angles are 5~20 °, 1~10mm of gap length between adjacent back blades and primary blades.By parameterizing optimizing, enter
The combination of row different schemes.The thickness at the end that becomes a mandarin of import distortion back blades 7 is less than or equal to the thickness at stream end, if needed
Space rounding processing can be carried out.It is preferred by being carried out to above parameter, example is selected, three-dimensional modeling, its import distortion is carried out
Back blades and primary blades three-dimensional modeling are as shown in Figure 5.
The import laying angle of back blades, and the gap with primary blades formation are distorted by adjusting import, can effectively be pressed down
System is developed into boundary layer separation in blade surface and is formed whirlpool region due to the change of fluid inflow angle, passes through back blades
Drainage and gap formed jet, the form of fluid winding flow blade can be improved so that flowing it is more stable, effectively improve
The hydraulic performance of centrifugal pump under multi-state.
It will be seen that from table 1, the present invention-centrifugal pump impeller with import distortion back blades be applied to certain centrifugal pump
On product, under 1450r/min rotating speed, in addition to indivedual operating points under low discharge, rest working conditions point lift and efficiency are all
Improve, high efficient district has obtained widening significantly.Meanwhile, table 2 is using centrifugal pump product the facing under three flows after the present invention
Boundary net positive suction head (NPSHc), it can see and also changed using the cavitation performance of centrifugal pump product after the present invention from table 2 and Fig. 6
It is kind.
Certain centrifugal pump of table 1 and the performance of centrifugal pump data pair that back blades is distorted with import being designed based on the impeller
Than
The NPSH of two kinds of impellers under the different flow of table 2cValue
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the description in above-described embodiment and specification is explanation
The principle of the present invention, on the premise of spirit and scope is not departed from, the present invention can also changes and improvements, these changes
It all fall within the protetion scope of the claimed invention with improvement.The scope of protection of present invention by appended claims and its
Equivalent is defined.
Claims (5)
1. a kind of centrifugal pump impeller that back blades is distorted with import, including the impeller hub (3) that be connected with pump shaft key and uniformly
In some primary blades (8) on wheel hub (3), it is characterised in that：It is equal with primary blades quantity that quantity is additionally provided with the wheel hub (3)
Import distortion back blades (7).The import distortion back blades (7) and the structurally independent design of primary blades (8), and import is turned round
Bent back blades (7) trailing edge, in the overlap distance for axially having setting, has the overlapping angle of setting with primary blades (8) leading edge in circumference；
There is the gap of setting between adjacent back blades (7) and primary blades (8).
2. the centrifugal pump impeller according to claim 1 that back blades is distorted with import, it is characterised in that：The import is turned round
Bent back blades is located at the front of primary blades (8) leading edge, and import distorts the relative position between back blades (7) and primary blades (8), with
On the basis of front side of vane, both overlap distances in axial direction are 0~10mm, are 5~20 ° in both circumferential overlapping angles,
1~10mm of gap length between adjacent back blades (7) and primary blades (8).
3. the centrifugal pump impeller according to claim 1 that back blades is distorted with import, it is characterised in that：The import is turned round
Bent back blades (7) entrance angle is 20~40 °.
4. the centrifugal pump impeller according to claim 1 that back blades is distorted with import, it is characterised in that：The primary blades
(8) entrance angle is 25~50 °.
5. the centrifugal pump impeller according to claim 1 that back blades is distorted with import, it is characterised in that：Described import
The thickness for distorting the end that becomes a mandarin of back blades is less than or equal to the thickness at stream end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710541106.6A CN107120307A (en) | 2017-07-05 | 2017-07-05 | The centrifugal pump impeller of back blades is distorted with import |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710541106.6A CN107120307A (en) | 2017-07-05 | 2017-07-05 | The centrifugal pump impeller of back blades is distorted with import |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107120307A true CN107120307A (en) | 2017-09-01 |
Family
ID=59730589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710541106.6A Pending CN107120307A (en) | 2017-07-05 | 2017-07-05 | The centrifugal pump impeller of back blades is distorted with import |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107120307A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201225317Y (en) * | 2008-09-02 | 2009-04-22 | 上海东方泵业(集团)有限公司 | Centrifugal pump impeller |
| CN201250795Y (en) * | 2008-09-18 | 2009-06-03 | 上海东方泵业(集团)有限公司 | Integral casting impeller |
| CN201250803Y (en) * | 2008-09-18 | 2009-06-03 | 上海东方泵业(集团)有限公司 | Centrifugal pump |
| CN201269219Y (en) * | 2008-09-19 | 2009-07-08 | 上海东方泵业(集团)有限公司 | Guide vane |
| CN101660542A (en) * | 2008-08-28 | 2010-03-03 | 上海大学 | Impeller of centrifugal pump |
| CN201661512U (en) * | 2010-08-16 | 2010-12-01 | 柳州桂滨铸造有限公司 | Slurry pump impeller |
-
2017
- 2017-07-05 CN CN201710541106.6A patent/CN107120307A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101660542A (en) * | 2008-08-28 | 2010-03-03 | 上海大学 | Impeller of centrifugal pump |
| CN201225317Y (en) * | 2008-09-02 | 2009-04-22 | 上海东方泵业(集团)有限公司 | Centrifugal pump impeller |
| CN201250795Y (en) * | 2008-09-18 | 2009-06-03 | 上海东方泵业(集团)有限公司 | Integral casting impeller |
| CN201250803Y (en) * | 2008-09-18 | 2009-06-03 | 上海东方泵业(集团)有限公司 | Centrifugal pump |
| CN201269219Y (en) * | 2008-09-19 | 2009-07-08 | 上海东方泵业(集团)有限公司 | Guide vane |
| CN201661512U (en) * | 2010-08-16 | 2010-12-01 | 柳州桂滨铸造有限公司 | Slurry pump impeller |
Non-Patent Citations (1)
| Title |
|---|
| 李随波等: "缝隙引流叶片对低比转速离心泵性能的影响", 《上海大学学报（自然科学版）》 * |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20170901 |
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| RJ01 | Rejection of invention patent application after publication |