CN203604248U - Blade structure for weakening leakage current and leakage vortex on blade top of axial flow pump - Google Patents
Blade structure for weakening leakage current and leakage vortex on blade top of axial flow pump Download PDFInfo
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- CN203604248U CN203604248U CN201320574194.7U CN201320574194U CN203604248U CN 203604248 U CN203604248 U CN 203604248U CN 201320574194 U CN201320574194 U CN 201320574194U CN 203604248 U CN203604248 U CN 203604248U
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Abstract
The utility model provides a blade structure for weakening leakage current and leakage vortex on blade top of an axial flow pump. The blade structure is characterized in that: the blade top of the axial flow pump is machined to a labyrinth type structure; the labyrinth type structure is zigzag and has certain gap, height, width, number of teeth, tooth top angle, etc. Through selecting an appropriate dimension of the zigzag structure, the blade structure has the beneficial effects of: enlarging energy loss of fluid which passes through the gap of blade tops by the axial flow pump through the labyrinth type structure on the blade tips, reducing leakage amount, weakening the leakage current and leakage vortex on the blade top, and improving hydraulic efficiency and operation stability of the axial flow pump.
Description
Technical field
The present invention relates to a kind ofly for weakening the blade structure of axial-flow pump leaf top leakage flow and leakage vortex, leaf top is designed to zigzag maze-type structure, belongs to fluid machinery product technical field.
Background technique
Axial-flow pump is because of features such as its flow are large, lift is low, simple in structure, easy to use, at farmland discharging-irrigating, control flood and drain flooded fields, the aspect such as urban water supply and sewerage, Inter-Basin Water Transfer Project is widely applied, the efficiency and the operation stability that therefore improve axial-flow pump have important practical significance.In axial-flow pump impeller, due to the structure characteristic of aial flow impeller, between impeller blade leaf top and runner envelope, unavoidably there is gap, although that the physical dimension in vane tip gap is compared with whole runner is very little, to blade passage nearly the mobile of 20% region exert an influence.Under the pressure-acting between axial flow pump blade inner working surface and suction surface, a part of flowing medium is crossed blade tip clearance, forms leakage flow.Leakage flow and main flow are entrainmented and are formed leaf top leakage vortex, leakage vortex whirlpool intensity and yardstick in the process of downstream increase gradually, stop up main flow, especially at low flow rate condition, easily induction axial-flow pump enters rotating stall unstable period, therefore, axial-flow pump leaf top leakage vortex stream field structure, Energy Transfer, load carrying capacity and loss important.The loss that leakage flow causes is relevant with leakage flow, and leakage flow is more, and the loss that leakage flow causes is larger.Therefore by someway leaf top leakage flow being hindered in leaf pressure on top surface face side, reduce its leakage rate to suction surface, more fluid is done work by impeller, can effectively reduce the adverse effect that leaf top leakage flow and leakage vortex cause impeller performance, can improve lift of pump and hydraulic efficiency, and improve the hydraulic stability of axial-flow pump.
Through retrieval, and published patent " a kind of axial flow pump impeller vane (application number: 02133456.0) ", it designs end of blade and leaf root part has adopted the blade that lengthens the distorted shape leaning forward.But this blade shape is more complicated, be difficult for processing, increase workload, and may not meet impeller original design in addition; Granted patent " a kind of high-efficiency axial-flow pump impeller (patent No.: ZL200920043160.9) ", its air foil shape by the different circumferential sections of adjustment blade obtains preferably hydraulic performance, but the traditional structure still adopting in the Ye Ding region of impeller blade.As can be seen here, the improvement of axial flow pump blade inner is at present mostly that the entirety of blade shape is changed, and not yet proposes a kind of blade squealer tip that improves to weaken the blade structure of leaf top leakage flow and leakage vortex.This patent is by invention axial-flow pump impeller leaf top end structure, throttling process in dependence gap and the kinetic energy dissipation in cavity are realized Fluid Sealing, simple in structure, can effectively weaken axial flow pump blade inner leaf top leakage flow and leakage vortex, finally improve hydraulic performance and the hydraulic stability of axial-flow pump.
Summary of the invention
The problem occurring in order to solve above-mentioned axial-flow pump leaf top leakage flow and leakage vortex, the object of the invention is to provide a kind of blade structure of axial-flow pump, in order to weaken axial-flow pump leaf top leakage flow and leakage vortex, improve impeller hydraulic efficiency, improve the operation stability of axial-flow pump.
The present invention for the technological scheme that its technical problem of solution adopts is: the leaf top of axial flow pump blade inner is designed to mazy end-face structure, this mazy end-face structure pattern is zigzag fashion, have certain throttle clearance, highly, the parameter attribute such as width, the number of teeth and Dendendum angle.Liquid between axial flow pump impeller vane runner is due to the differential pressure action between blade pressure surface and suction surface, pass through blade tip clearance, leak into suction surface from blade pressure surface, through the zigzag fashion labyrinth structure on leaf top, can increase fluid flow resistance, the fluid section kinetic energy of the blade tip clearance that makes to flow through is consumed, can reach the effect that reduces leakage rate, effectively suppress the formation of leaf top leakage vortex, reduced leakage loss, improved hydraulic efficiency and operation stability.
Blade structure of the present invention can be realized manufacture by digital control processing, directly process jagged maze-type structure at axial flow pump blade inner leaf top end place, processing method maturation, simple and convenient, be particularly useful for the axial flow pump impeller vane (more than impeller diameter 1000mm) of large pumping station.
The invention has the beneficial effects as follows, by axial flow pump blade inner leaf top end maze-type structure, leaf top leakage flow can be hindered in leaf pressure on top surface face side, reduce its leakage rate to suction surface, more fluid is done work by impeller, and the energy that small leakage flow induction produces leakage vortex can significantly reduce, and reduces to greatest extent the adverse effect that leaf top leakage flow and leakage vortex cause impeller performance, improve lift of pump and hydraulic efficiency, and improve the hydraulic stability of axial-flow pump.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and the present invention is further described.
Fig. 1 is the schematic diagram of axial-flow pump impeller in pump case.
Fig. 2 is in accompanying drawing 1, a kind of local enlarged diagram of blade structure that weakens axial-flow pump leaf top leakage flow and leakage vortex that the present invention is mentioned.
Fig. 3 is the blade tip zigzag fashion maze-type structure amplification view of Fig. 2.
In figure, the 1st, impeller blade, the 2nd, impeller hub, the 3rd, runner envelope, 4 is impeller clearance, the 5th, leaf top, the 6th, pressure side, the 7th, suction surface, the 8th, zigzag fashion labyrinth structure, the 9th, leaf top leakage flow and leakage vortex, the 10th, impeller channel main flow, the 11st, wheel hub surface.
In Fig. 3, C represents blade tip clearance size, and H represents sawtooth height, and W represents the facewidth, and α represents addendum angle, D
2represent blade rim external diameter.
Embodiment
In the part schematic diagram 1 of axial-flow pump, comprise the impeller blade (1) of axial-flow pump, impeller hub (2), runner envelope (3), impeller clearance (4) and leaf top (5).Zigzag fashion maze-type structure of the present invention designs in Ye Ding (5), and the distance between impeller blade (1) and the wall of runner envelope (3) is impeller clearance (4).Impeller blade is fixed on impeller hub (2) by fixed block.Liquid (10) between axial flow pump impeller vane runner is due to the differential pressure action between blade pressure surface (7) and suction surface (6), by blade tip clearance (4), leak into suction surface (6) from blade pressure surface (7), through the zigzag fashion labyrinth structure (8) on leaf top, increase fluid flow resistance, the fluid section kinetic energy of blade tip clearance of making to flow through is consumed, thereby reduce blade tip clearance leakage rate, and suppress the formation of leaf top leakage vortex.Impeller blade leaf top saw profile of tooth labyrinth structure (8) in Fig. 2, its crown place flow section is little, and flow velocity increases, and liquid produces jet phenomenon, and pressure energy is converted into kinetic energy, and pressure significantly reduces; When liquid enters the large cavity inside between two rectangular teeths, because Cavity Flow cross section is larger, flow rate of liquid reduces, and forms large vortex at the cavity inside of leaf top saw profile of tooth labyrinth structure (8), and the part kinetic energy of fluid is dissipated.Due to the kinetic energy dissipation effect in throttling and the sealed chamber at crown place, thereby reduction hydrodynamic pressure, reach the effect of sealing, thereby reduced the leakage flow that impeller clearance (4) is located, effectively suppressed the formation of leaf top leakage flow and leakage vortex (9).In conjunction with the major parameter of Fig. 3 leaf top saw profile of tooth maze-type structure, blade tip clearance C, value is a thousandth (being D2/1000) of blade rim external diameter; The number of teeth is definite by the thickness of blade outer rim aerofoil profile, and it equals the ratio of thickness and width W; It (is 3D that sawtooth height H is got 3/1000ths to 5/1000ths of blade rim external diameter
2≤ H≤5D
2/ 1000); Height H is (H/S) with the ratio of width S
opt≈ 0.5; Addendum angle α span is 30 °～35 °.
Claims (1)
1. a blade structure that weakens axial-flow pump leaf top leakage flow and leakage vortex, is applied to axial-flow pump impeller, it is characterized in that: this blade and blade top adopts maze-type structure, and its cross section is zigzag fashion, and sawtooth height H is got blade rim D outer diameter
23/1000ths to 5/1000ths between, sawtooth height H is about 0.5 with the ratio of width W, addendum angle α span is 30 °～35 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574194.7U CN203604248U (en) | 2013-09-06 | 2013-09-06 | Blade structure for weakening leakage current and leakage vortex on blade top of axial flow pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320574194.7U CN203604248U (en) | 2013-09-06 | 2013-09-06 | Blade structure for weakening leakage current and leakage vortex on blade top of axial flow pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203604248U true CN203604248U (en) | 2014-05-21 |
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ID=50716925
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320574194.7U Expired - Fee Related CN203604248U (en) | 2013-09-06 | 2013-09-06 | Blade structure for weakening leakage current and leakage vortex on blade top of axial flow pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203604248U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275880A (en) * | 2015-10-16 | 2016-01-27 | 江苏大学 | Flow mixing type nuclear main pump |
| CN113123995A (en) * | 2021-04-21 | 2021-07-16 | 清华大学 | Fish-friendly axial-flow type vane pump |
-
2013
- 2013-09-06 CN CN201320574194.7U patent/CN203604248U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275880A (en) * | 2015-10-16 | 2016-01-27 | 江苏大学 | Flow mixing type nuclear main pump |
| CN105275880B (en) * | 2015-10-16 | 2019-02-05 | 江苏大学 | A kind of mixed-flow core main pump |
| CN113123995A (en) * | 2021-04-21 | 2021-07-16 | 清华大学 | Fish-friendly axial-flow type vane pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20150906 |
|
| EXPY | Termination of patent right or utility model |