CN106438475A - Diagonal flow pump inhibiting blade tip leakage flow - Google Patents

Diagonal flow pump inhibiting blade tip leakage flow Download PDF

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Publication number
CN106438475A
CN106438475A CN201610828287.6A CN201610828287A CN106438475A CN 106438475 A CN106438475 A CN 106438475A CN 201610828287 A CN201610828287 A CN 201610828287A CN 106438475 A CN106438475 A CN 106438475A
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CN
China
Prior art keywords
flow
tip leakage
blade tip
runner
diagonal
Prior art date
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.)
Pending
Application number
CN201610828287.6A
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Chinese (zh)
Inventor
张德胜
刘俊龙
耿琳琳
石磊
陈健
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Jiangsu University
Original Assignee
Jiangsu University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jiangsu University filed Critical Jiangsu University
Priority to CN201610828287.6A priority Critical patent/CN106438475A/en
Publication of CN106438475A publication Critical patent/CN106438475A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/40Casings; Connections of working fluid
    • F04D29/406Casings; Connections of working fluid especially adapted for liquid pumps

Abstract

The invention relates to a diagonal flow pump inhibiting blade tip leakage flow. The diagonal flow pump comprises an inlet section, a cylindrical outer barrel and a bent pipe section; a pump shaft penetrates through the cylindrical outer barrel and the bent pipe section; the face of an inner cavity of the inlet section is composed of a suction chamber wall face and a runner chamber wall face; an impeller is installed at the top end of the pump shaft and located in a runner chamber; the suction chamber wall face is a circular conical face, and the runner chamber wall face is a circular arc face; and a plurality of arc-shaped bosses are distributed on the periphery of the surface of the runner chamber wall face. According to the diagonal flow pump inhibiting blade tip leakage flow, the distance between the flange of each blade and the runner chamber wall face can be decreased by arranging the annular bosses, namely, the blade tip clearances are decreased, accordingly, the blade tip leakage rate is decreased, the strength of blade tip leakage vortex formed through mutual action of the blade tip leakage flow and main flow can also be reduced, and thus the inner flow stability of the impeller can be improved to a certain degree; and meanwhile, stalling can also be effectively inhibited from occurring, accordingly, the stability of the diagonal flow pump is improved, and the 'hump' phenomenon is inhibited from occurring.

Description

A kind of diagonal pumps of suppression blade-tip leakage flow
Technical field
The present invention relates to a kind of diagonal pumps, more particularly, to a kind of diagonal pumps that can suppress blade-tip leakage flow.
Background technology
Guide vane mixed flow pump is otherwise known as diagonal pumps, and performance, between axial-flow pump and centrifugal pump, has that flow is big, anti-vapour The advantages of erosion is functional, high efficient district scope is wide, therefore extensively applies agricultural drainage and irrigation, municipal plumbing, project of South-to-North water diversion, electricity Factory supplies the fields such as recirculated water, regional water transfer, in recent years also gradually to nuclear power, the development of naval vessel hydraulic jet propulsion aspect.
There is gap, the static pressure of blade pressure surface is higher than suction surface therefore leaf between diagonal pumps wheel rim and runner envelope Top leakage stream is to flow towards suction surface from pressure, and that is, flow direction is contrary with impeller direction of rotation, blade-tip leakage flow and main flow Interaction can form the flowing that blade tip leakage vortex affects in runner, additionally, blade-tip leakage flow also can make adjacent blades import wheel The circumferential speed component to flow at edge increases, and promotes the angle of attack at impeller inlet wheel rim to increase, and then leads to the flowing in this region Separate to strengthen and stall even occurs, " hump " in head curve, and then affects the flow stability in the pump housing.
Through retrieval, in terms of improving diagonal pumps stability, a kind of Jiangsu University's " oblique flow impeller of pump Hydraulic Design Method " (Shen Please number:CN201410711980), this patent gives the design formula of the main geometry design parameter of impeller, by this design side Method makes the hydraulic efficiency of oblique flow impeller of pump and diagonal pumps stability be increased.This patent is the Hydraulic Design from impeller Aspect improving the slope of impeller and stability and this patent proposes a kind of brand-new runner envelope, by reducing blade-tip leakage flow To weaken the impact to inlet velocity for the leakage stream, and then the purpose reaching suppression impeller stall and improving diagonal pumps stability.
Content of the invention
In order to reduce the impact to diagonal pumps performance for the blade-tip leakage flow, prevent oblique flow pump lift curve under low flow rate condition " hump " phenomenon occurs, improves the operation stability of diagonal pumps, the invention provides a kind of structure is simply efficient, easy to process Diagonal pumps.
For achieving the above object, the technical scheme that the present invention takes is:A kind of diagonal pumps of suppression blade-tip leakage flow, Including inducer, cylinder outer tube and bend loss, pump shaft passes through described cylinder outer tube and bend loss, the inner cavity surface of described inducer by Suction chamber wall and runner envelope wall composition, the top of described pump shaft is provided with impeller, and described impeller is located at runner interior, described Suction chamber wall is taper seat, and described runner envelope wall is arc surface, and the surface surrounding of described runner envelope wall is distributed with some Individual arc boss.
In such scheme, described arc boss extends to runner envelope wall from suction chamber wall and runner envelope wall intersection With cylinder outer tube inner wall face intersection.
In such scheme, the radian of described arc boss is identical with the radian of described runner envelope wall.
In such scheme, the longitudinal section of described arc boss is square-section.
In such scheme, the quantity of described arc boss is 24, and described arc boss is by being distributed in described runner envelope On the arc surface of wall.
Beneficial effects of the present invention:(1) annular boss can reduce the distance of blade rim to runner envelope wall and reduce Blade tip clearance, and then leakage rate is also determined in reduction, the blade tip leakage vortex intensity that blade-tip leakage flow is formed with main flow interaction also can Reduce therewith, therefore can improve Flow in Impeller stability to a certain extent.(2) the most of blade-tip leakage flow of another aspect Can be stopped by runner envelope wall annular boss makes it can not flow to adjacent blades import, and it is strong that this not only can reduce blade-tip leakage flow Degree, moreover it is possible to weaken the impact that blade-tip leakage flow to flow circumferential speed component to adjacent blades import, effectively suppresses the product of stall Raw, thus improving the stability of diagonal pumps, the appearance of suppression " hump " phenomenon.
Brief description
Fig. 1 is the general assembly drawing of diagonal pumps of the present invention.
Fig. 2 is suction chamber wall and the runner envelope wall structure schematic diagram of the present invention.
Fig. 3 is profile at B in Fig. 1.
Fig. 4 is inducer left view.
Fig. 5 is the diagonal pumps external characteristic curve figure of conventional rotary room and runner envelope of the present invention.
In figure:1. inducer, 2. hexagon socket cap head screw, 3. water guide cone, 4. impeller, 5. fillister head screw, 6. bolt, 7. stator, 8. cylinder outer tube, 9. bend loss, 10. mechanical seal, 11. angular contact ball bearings, 12. packing ring oil sealings, 13. shaft couplings, 14. suction chamber walls, 15. runner envelope walls, 16. arc boss, 17. runner wheels are firm, 18. diffusers, 19. bearing enclosures, and 20. The flat cheese head screw of interior hexagonal, 21. deep groove ball bearings, 22. sealing rings, 23. pump shafts.
Specific embodiment
With specific embodiment, the present invention is described in further detail below in conjunction with the accompanying drawings.
By Fig. 1 to Fig. 4 as can be seen that the diagonal pumps of the present embodiment are by inducer 1, hexagon socket cap head screw 2, water guide Cone 3, impeller 4, fillister head screw 5, bolt 6, stator 7, cylinder outer tube 8, bend loss 9, mechanical seal 10, angular contact ball bearing 11, packing ring oil sealing 12, shaft coupling 13, runner wheel firm 17, diffuser 18, the left oil sealing of bearing 19, the flat cheese head screw 20 of interior hexagonal, deep Ditch ball bearing 21, sealing ring 22, pump shaft 23.Inducer 1 passes through bolt 6 and is attached fixing with cylinder outer tube 8, inducer 1 He Cylinder outer tube 8 by concavo-convex chimeric by way of positioned and ensured concentricity;Cylinder outer tube 8 and bend loss 9 are also by bolt 6 It is attached fixing by flange, in order to ensure the outer drum flange of quick and easy for installation and concentricity accuracy cylinder and bend pipe Duan Falan be also using concavo-convex embedded by the way of;The inner chamber wall of inducer 1 is by suction chamber wall 14 and 15 liang of runner envelope wall Part is constituted, and described suction chamber wall 14 is in the conical surface, and described runner envelope wall 15 is in arc surface, on described runner envelope wall 15 all Even be dispersed with 24 arc boss 16, arc boss 16 extends to runner locular wall from upstream chamber wall and runner envelope wall intersection Face and cylinder outer tube inner wall face intersection, and the radian phase of the radian of arc boss 16 and the arc surface of runner envelope wall 15 With the rectangular cross-section of arc boss 16;The runner that described blade 4 is located at described inducer 1 is indoor, the impeller of described blade 4 Inlet side is just just to described upstream chamber wall 14 and runner envelope wall 15 intersection.Inducer 1, cylinder outer tube 8 and bend pipe Section 10 is all to be sealed by sealing ring 22;Water guide cone 3 hexagon socket cap head screw 2 is fixed on runner wheel firm 17;Leaf Piece 4 is fixed on runner wheel firm 17 by fillister head screw 5;In diffuser 18, a deep groove ball bearing 21 is installed, by depth The connection of stationary parts and rotatable parts realized by ditch bearing;At deep groove ball bearing 21 about two ends equipped with bearing enclosure 19;Pump shaft It is additionally provided with angular contact ball bearing 11, packing ring oil sealing 12 and shaft coupling 13 on 23.Shaft coupling 13 connects pump shaft 24 and machine shaft.
It is the diagonal pumps of the present invention obtaining with simulation softward and the external characteristic curve figure having cannelure as shown in Figure 5, Oblique flow pump specific angular speed n of the present inventions=829, inducer diameter D1=200mm, impeller inlet diameter D2=180.86mm, impeller goes out Mouth diameter D3=215.76mm, several pieces Z of impeller blade1=4, several pieces Z of stator blade2=5, exducer diameter D4=250mm, turns Fast n=1450r/min, the depth of section h of arc boss 161=1.5mm, width d1=1mm, blade tip clearance h2=2mm.Fig. 5 is Using runner envelope diagonal pumps simulated performance curve of the present invention and the performance curve comparison diagram using conventional rotary room diagonal pumps, in figure H1And H2It is conventional rotary room diagonal pumps simulation lift and runner envelope diagonal pumps of the present invention simulation lift respectively.Can be very from figure Will become apparent from runner envelope of the present invention diagonal pumps performance is improved it is obvious that especially in 0.6Qopt-0.8QoptThe most obvious.

Claims (5)

1. a kind of diagonal pumps of suppression blade-tip leakage flow, including inducer(1), cylinder outer tube(8)And bend loss(9), pump shaft (23)Through described cylinder outer tube(8)And bend loss(9), described inducer(1)Inner cavity surface by suction chamber wall(14)With turn Engineer room wall(15)Composition, described pump shaft(23)Top impeller is installed(4), described impeller(4)Indoor positioned at runner, it is special Levy and be, described suction chamber wall(14)For taper seat, described runner envelope wall(15)For arc surface, described runner envelope wall (15)Surface surrounding several arc boss is distributed with(16).
2. a kind of diagonal pumps of suppression blade-tip leakage flow according to claim 1 are it is characterised in that described arc boss (16)From suction chamber wall(14)With runner envelope wall(15)Intersection extends to runner envelope wall(15)With cylinder outer tube inner wall Face intersection.
3. a kind of diagonal pumps of suppression blade-tip leakage flow according to claim 3 are it is characterised in that described arc boss (16)Radian and described runner envelope wall(15)Radian identical.
4. a kind of diagonal pumps of the suppression blade-tip leakage flow according to Claims 2 or 3 are it is characterised in that described arc is convex Platform(16)Longitudinal section be square-section.
5. a kind of diagonal pumps of suppression blade-tip leakage flow according to claim 4 are it is characterised in that described arc boss (16)Quantity be 24, described arc boss(16)By being distributed in described runner envelope wall(15)Arc surface on.
CN201610828287.6A 2016-09-18 2016-09-18 Diagonal flow pump inhibiting blade tip leakage flow Pending CN106438475A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610828287.6A CN106438475A (en) 2016-09-18 2016-09-18 Diagonal flow pump inhibiting blade tip leakage flow

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610828287.6A CN106438475A (en) 2016-09-18 2016-09-18 Diagonal flow pump inhibiting blade tip leakage flow

Publications (1)

Publication Number Publication Date
CN106438475A true CN106438475A (en) 2017-02-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109882448A (en) * 2019-02-25 2019-06-14 江苏大学 A kind of mixed-flow pump runner envelope with arc-shaped pumping groove

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063848A (en) * 1976-03-24 1977-12-20 Caterpillar Tractor Co. Centrifugal compressor vaneless space casing treatment
US4212585A (en) * 1978-01-20 1980-07-15 Northern Research And Engineering Corporation Centrifugal compressor
US4714406A (en) * 1983-09-14 1987-12-22 Rolls-Royce Plc Turbines
CN1096347A (en) * 1993-03-04 1994-12-14 Abb管理有限公司 Has the centrifugal compressor that can make the stable casing that flows
CN1281953A (en) * 1999-07-15 2001-01-31 株式会社日立制作所 Turbomachine
CN105673553A (en) * 2016-03-18 2016-06-15 江苏大学 Diagonal flow pump

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063848A (en) * 1976-03-24 1977-12-20 Caterpillar Tractor Co. Centrifugal compressor vaneless space casing treatment
US4212585A (en) * 1978-01-20 1980-07-15 Northern Research And Engineering Corporation Centrifugal compressor
US4714406A (en) * 1983-09-14 1987-12-22 Rolls-Royce Plc Turbines
CN1096347A (en) * 1993-03-04 1994-12-14 Abb管理有限公司 Has the centrifugal compressor that can make the stable casing that flows
CN1281953A (en) * 1999-07-15 2001-01-31 株式会社日立制作所 Turbomachine
CN105673553A (en) * 2016-03-18 2016-06-15 江苏大学 Diagonal flow pump

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109882448A (en) * 2019-02-25 2019-06-14 江苏大学 A kind of mixed-flow pump runner envelope with arc-shaped pumping groove

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Application publication date: 20170222