CN102062116A - Gap diversion type axial-flow pump impeller - Google Patents
Gap diversion type axial-flow pump impeller Download PDFInfo
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- CN102062116A CN102062116A CN 201010607889 CN201010607889A CN102062116A CN 102062116 A CN102062116 A CN 102062116A CN 201010607889 CN201010607889 CN 201010607889 CN 201010607889 A CN201010607889 A CN 201010607889A CN 102062116 A CN102062116 A CN 102062116A
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Abstract
The invention relates to a gap diversion type axial-flow pump impeller which comprises a hub and a blade fixed on the hub, wherein a gap for diversion is opened on the blade. When fluid passes through the gap, a new boundary layer is produced on the back of the blade, which can bear the reverse pressure gradient of the fluid to effectively eliminate flow separation of the boundary layer, reduce energy loss and ensure relatively high efficiency of the axial-flow water pump under full working conditions.
Description
Technical field
The present invention relates to a kind of slit drainage type axial-flow pump impeller, belong to the field of fluid machinery category.
Background technique
Axial flow pump has the advantages that flow is big, lift is low, especially in basin water transfer, field irrigation, control flood and drain flooded fields, field such as municipal water supply, Water of Power Plant circulation is widely used, and the newly-built pumping plant in the project of South-to-North water diversion that China is implementing mostly needs to adopt axial flow pump.Axial flow pump efficient when design conditions point is higher, but efficient narrow range, the irregular operation zone is arranged.Axial flow pump is in actual moving process, and often the off-design operating point is easy to generate the boundary layer flow separation and forms and reflux, as shown in Figure 1 at the back side of impeller.The flow separation in boundary layer, cause causing very big trailing vortex resistance, and the trailing vortex resistance do not produce tens times of the suffered surface friction drag of flow separation in the boundary layer often, cause the loss of excessive power, directly influence the efficient of water pump.This shows that under certain incoming flow angle of attack, the flow separation in the boundary layer of control vacuum side of blade can effectively improve the service behaviour of impeller, thereby help to improve the full performance of operating condition of axial flow pump.Therefore, design a kind of effective elimination flow separation and the aial flow impeller of the trailing vortex resistance that causes is even more important.
Summary of the invention
The objective of the invention is to defective at the prior art existence, a kind of slit drainage type axial-flow pump impeller is provided, improves the full performance of operating condition of axial flow pump, eliminate the fluidal textures such as backflow that cause owing to boundary layer separation, avoid unnecessary energy loss, thereby improve the working efficiency of impeller.
For achieving the above object, the present invention adopts following technical proposals:
A kind of slit drainage type axial-flow pump impeller comprises wheel hub and is fixed on blade on the wheel hub that each blade has the slit one, and blade is divided into front vane and rear blade.
The gap position of described blade is positioned near blade inlet edge 5 ~ 40% chord length scopes.
The flow direction in described slit is that the average Normal direction of slit flow-passing surface becomes 10 ~ 60 ° angle with the axis of wheel hub.
The flow direction in described slit is that the average Normal direction of slit flow-passing surface becomes 10 ~ 60 ° angle with the string of a musical instrument of place aerofoil profile.
The runner direction in the slit of described blade should be complied with the flow direction of fluid in impeller.
The slit center line face of described blade be the space curved surface that is similar to vertical wheel hub, by front vane trailing edge and rear blade leading edge
The shape decision.
The gap width of described blade is of a size of 0.5 ~ 3 times maximum blade thickness size.
The present invention compared with prior art, have following conspicuous outstanding substantive distinguishing features and remarkable advantage: before flow separation takes place in the boundary layer of vacuum side of blade, the fluid of utilization by the slit is brought in the main flow the original boundary layer of vacuum side of blade and goes, thereby form new boundary layer, it can bear the contrary pressure gradient of fluid and avoid producing mobile separation.Slit of the present invention drainage type structure can effectively be eliminated the trailing vortex resistance that produces owing to flow separation, thereby has improved the working efficiency, particularly axial flow pump of the impeller efficient at off-design behaviour point, has finally guaranteed the full performance of operating condition of axial flow pump.
Description of drawings
Fig. 1 tradition axial flow pump impeller blade boundary layer flow is separated the flow field schematic representation that produces the trailing vortex district;
Fig. 2 slit drainage type axial-flow pump impeller structural representation;
Fig. 3 slit drainage type axial flow pump impeller vane structural representation;
Fig. 4 adopts the flow field schematic representation behind the drainage type impeller blade of slit.
Embodiment
In order to make technological means and the effect easy to understand understanding thereof that the present invention realizes, below preferred embodiment further set forth the present invention in conjunction with the accompanying drawings.
Embodiment one: referring to Fig. 2 and Fig. 3, this slit drainage type axial-flow pump impeller comprises wheel hub 1 and fixes blade 2 on it, has slit 6 in the middle of the described blade, thereby blade 2 is divided into front vane 3 and rear blade 4.
Embodiment two: present embodiment and embodiment one are basic identical, specialization is as follows: with reference to accompanying drawing 2 and accompanying drawing 3, the impeller of axial flow pump is made of wheel hub 1 and fixed thereon 's blade 2, wherein blade 2 is distributed on the wheel hub 1, the quantity of blade 2 can be three, four or other quantity, mainly selectes blade quantity according to the designing requirement of pump.
The impeller of present embodiment can or be stuck with paste the gold sand casting impeller for grease sand, resin sand, and perhaps the impeller of precision casting also can be processed impeller or welding impeller for metal.In addition, the thought of present embodiment is removed and is used on the impeller of axial flow pump, also can be used for centrifugal or the mixed-flow impeller blade.No matter be which kind of impeller blade, the opening direction in slit 6 should be complied with the flow direction of fluid, and the position is in distance blade inlet edge 5 ~ 40% chord length scopes simultaneously.
The impeller of present embodiment by processing that blade 2 is cracked, is divided into front vane 3 and rear blade 4 with blade 2.The runner direction in slit 6 will be complied with the flow direction of fluid, leading edge 5 distances that slit 6 aperture positions are positioned at blade 2 are 5 ~ 40% chord length places, the average Normal direction of slit 6 streamwise slit flow-passing surfaces and the string of a musical instrument angle in the aerofoil profile plane, place are 10 ~ 60 °, the average Normal direction of slit 6 streamwise slit flow-passing surfaces becomes 10 ~ 60 ° angle with the axis with wheel hub 1, slit 6 center line faces are the space curved surface that is similar to vertical wheel hub 1, by the decision of the shape of front vane 3 trailing edges and rear blade 4 leading edges, the width dimensions span in slit 6 is 0.5 ~ 3 times maximum blade thickness size.
Axial flow pump is in the efficient the best at optimum operating condition point place, but in the general using process, axial flow pump often operates at off-design behaviour point place.Traditional aial flow impeller in rotation process, just thereby fluid produces the working efficiency that the flow separation in boundary layer influences blade soon after being everlasting by blade inlet edge 5, as Fig. 1.And by the employing processing of cracking, segment fluid flow enters into the runner of impeller by slit 6, thereby forms new boundary layer, and it can bear the contrary pressure gradient of fluid, has eliminated the flow separation in boundary layer, as shown in Figure 4.Because the disappearance of separation zone, flow resistance reduces greatly, thereby can promote the full performance of operating condition of axial flow pump.
Claims (7)
1. slit drainage type axial-flow pump impeller comprises wheel hub (1) and fixes blade (2) on it, it is characterized in that having slit (6) in the middle of the described blade, thereby blade (2) is divided into front vane (3) and rear blade (4).
2. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: described slit (6) are positioned at 5 ~ 40% chord length positions near the leading edge (5) of blade (2).
3. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: the flow direction of described slit (6) is that the average Normal direction of slit flow-passing surface becomes 10 ~ 60 ° angle with the axis of wheel hub (1).
4. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: the width of described slit (6) is 0.5 ~ 3 times of blade (2) maximum ga(u)ge.
5. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: the runner direction of described slit (6) should be complied with the flow direction of fluid in impeller.
6. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: the flow direction of described slit (6) is that the average Normal direction of slit flow-passing surface becomes 10 ~ 60 ° angle with the string of a musical instrument of place aerofoil profile.
7. slit according to claim 1 drainage type axial-flow pump impeller is characterized in that: described slit (6) center line face is for being similar to the space curved surface of vertical wheel hub (1), by the shape decision of front vane (3) trailing edge and rear blade (4) leading edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607889 CN102062116A (en) | 2010-12-28 | 2010-12-28 | Gap diversion type axial-flow pump impeller |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010607889 CN102062116A (en) | 2010-12-28 | 2010-12-28 | Gap diversion type axial-flow pump impeller |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102062116A true CN102062116A (en) | 2011-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010607889 Pending CN102062116A (en) | 2010-12-28 | 2010-12-28 | Gap diversion type axial-flow pump impeller |
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| CN (1) | CN102062116A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777418A (en) * | 2012-07-09 | 2012-11-14 | 广东美的电器股份有限公司 | Axial flow wind wheel and air-conditioning outdoor unit |
| CN103233914A (en) * | 2013-05-23 | 2013-08-07 | 上海大学 | Guide axial flow pump impeller |
| CN109098974A (en) * | 2018-07-27 | 2018-12-28 | 江苏大学 | It is a kind of can gas-liquid delivery high-lift multi-stage side channel pump |
| CN110552909A (en) * | 2019-09-18 | 2019-12-10 | 兰州理工大学 | Spiral axial flow impeller with non-coaxial surface drainage |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS555458A (en) * | 1978-06-28 | 1980-01-16 | Hitachi Ltd | Tandem impeller |
| JPH04132897A (en) * | 1990-09-25 | 1992-05-07 | Hitachi Ltd | Pump impeller |
| CN1087973A (en) * | 1993-07-10 | 1994-06-15 | 王传彬 | The control that the turbulent flow of fan blade separates with boundary layer |
| CN1103137A (en) * | 1993-08-02 | 1995-05-31 | 赫德森产品公司 | Extruded aluminum fan blade |
| CN1930394A (en) * | 2004-03-18 | 2007-03-14 | 弗兰克·丹尼尔·洛特里翁特 | Turbine and rotor therefor |
| CN101571142A (en) * | 2009-05-26 | 2009-11-04 | 上海大学 | Groove suction vane for pump |
-
2010
- 2010-12-28 CN CN 201010607889 patent/CN102062116A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS555458A (en) * | 1978-06-28 | 1980-01-16 | Hitachi Ltd | Tandem impeller |
| JPH04132897A (en) * | 1990-09-25 | 1992-05-07 | Hitachi Ltd | Pump impeller |
| CN1087973A (en) * | 1993-07-10 | 1994-06-15 | 王传彬 | The control that the turbulent flow of fan blade separates with boundary layer |
| CN1103137A (en) * | 1993-08-02 | 1995-05-31 | 赫德森产品公司 | Extruded aluminum fan blade |
| CN1930394A (en) * | 2004-03-18 | 2007-03-14 | 弗兰克·丹尼尔·洛特里翁特 | Turbine and rotor therefor |
| CN101571142A (en) * | 2009-05-26 | 2009-11-04 | 上海大学 | Groove suction vane for pump |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102777418A (en) * | 2012-07-09 | 2012-11-14 | 广东美的电器股份有限公司 | Axial flow wind wheel and air-conditioning outdoor unit |
| CN102777418B (en) * | 2012-07-09 | 2015-04-15 | 美的集团股份有限公司 | Axial flow wind wheel and air-conditioning outdoor unit |
| CN103233914A (en) * | 2013-05-23 | 2013-08-07 | 上海大学 | Guide axial flow pump impeller |
| CN109098974A (en) * | 2018-07-27 | 2018-12-28 | 江苏大学 | It is a kind of can gas-liquid delivery high-lift multi-stage side channel pump |
| CN110552909A (en) * | 2019-09-18 | 2019-12-10 | 兰州理工大学 | Spiral axial flow impeller with non-coaxial surface drainage |
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Application publication date: 20110518 |