CN205714923U - A kind of diagonal pumps - Google Patents

A kind of diagonal pumps Download PDF

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Publication number
CN205714923U
CN205714923U CN201620207697.4U CN201620207697U CN205714923U CN 205714923 U CN205714923 U CN 205714923U CN 201620207697 U CN201620207697 U CN 201620207697U CN 205714923 U CN205714923 U CN 205714923U
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CN
China
Prior art keywords
diagonal pumps
inducer
blade
pump shaft
runner
Prior art date
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Expired - Fee Related
Application number
CN201620207697.4U
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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
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Jiangsu University
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Priority to CN201620207697.4U priority Critical patent/CN205714923U/en
Application granted granted Critical
Publication of CN205714923U publication Critical patent/CN205714923U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Abstract

This utility model provides a kind of diagonal pumps, including pump shaft, inducer, cylinder urceolus and bend loss, described pump shaft passes described cylinder urceolus and described bend loss, on described pump shaft, blade is installed, the inner chamber wall of described inducer is made up of upstream chamber wall and runner envelope wall two parts, described upstream chamber wall is the conical surface, and described runner envelope wall is cambered surface, and described runner envelope wall is tangent with the internal face of described cylinder urceolus;Described blade is positioned at the runner envelope of described inducer, described upstream chamber wall and runner envelope wall intersection and has cannelure.Diagonal pumps of the present utility model can weaken the intensity of import department's blade-tip leakage flow, reduces its impact on impeller internal flowing, improves oblique flow pump performance, the appearance in effective suppression " hump " district and the operation stability of raising diagonal pumps.

Description

A kind of diagonal pumps
Technical field
This utility model relates to a kind of diagonal pumps, particularly relates to the diagonal pumps that a kind of big flow, low lift, efficient district are relatively wide.
Background technology
The specific speed of diagonal pumps is higher, and performance is between axial-flow pump and centrifugal pump.Thus the advantage that diagonal pumps have had axial-flow pump and centrifugal pump concurrently, i.e. have that lift excursion changes district smooth, efficient width at 3 ~ 30m and lift and power curve, anti-cavitation performance is good, be easy to the advantages such as startup, it is mainly used in the fields such as agricultural drainage and irrigation, municipal administration plumbing, project of South-to-North water diversion, power plant's confession recirculated water, regional water transfer, the most gradually to nuclear power, the development of naval vessel hydraulic jet propulsion aspect.
There is gap between diagonal pumps wheel rim and runner envelope, when impeller rotates, the static pressure of blade pressure surface is higher than suction surface, and fluid flows to suction surface from pressure face through blade tip clearance under the effect of pressure reduction and forms blade-tip leakage flow.Blade-tip leakage flow interacts with main flow and forms blade tip leakage vortex, and this not only can affect diagonal pumps internal flow state, and the most also can block runner affects the operation stability of diagonal pumps.Low flow rate condition lower blade inlet incidence angle increases, fluid easily forms whirlpool in vane inlet suction surface generation flow separation, further reduction along with flow, flow separation aggravates the spin intensity of whirlpool simultaneously the most therewith also can be increased, the static pressure of vane inlet suction surface then can reduce rapidly, promoting pressure face to increase with suction surface pressure reduction, leaf top leakage rate increases, and then increases diagonal pumps internal flow unstability.Additionally, blade-tip leakage flow can increase the main flow circumferential speed component at adjacent blades import wheel rim, the angle of attack at impeller inlet wheel rim increases, and causes the critical stall point of diagonal pumps to offset to big direction of the traffic, affects the safe operation of diagonal pumps.
Through retrieval, in terms of improving diagonal pumps stability, Jiangsu University " a kind of diagonal pumps impeller Hydraulic Design Method " (application number: CN201410711980), this patent gives the design formula of the main geometry design parameter of impeller, makes the hydraulic efficiency of diagonal pumps impeller and diagonal pumps stability be increased by this method for designing.This patent is to improve the slope of impeller and stability in terms of the Hydraulic Design of impeller and this patent is to improve the stability of diagonal pumps by weakening blade-tip leakage flow intensity suppression impeller rotating stall at runner envelope grooved wall surface.
Utility model content
In order to reduce the blade-tip leakage flow impact on diagonal pumps performance, the particularly appearance in diagonal pumps " hump " district under suppression low flow rate condition, improve the operation stability of diagonal pumps, this utility model provides a kind of diagonal pumps the most efficient, easy to process.
For realizing above-mentioned utility model purpose, the technical scheme that this utility model is taked is: a kind of diagonal pumps, including pump shaft, inducer, cylinder urceolus and bend loss, described pump shaft passes described cylinder urceolus and described bend loss, being provided with blade on described pump shaft, the inner chamber wall of described inducer is made up of upstream chamber wall and runner envelope wall two parts, and described upstream chamber wall is the conical surface, described runner envelope wall is cambered surface, and described runner envelope wall is tangent with the internal face of described cylinder urceolus;Described blade is positioned at the runner envelope of described inducer, described upstream chamber wall and runner envelope wall intersection and has cannelure.
In such scheme, the impeller inlet limit of described blade is just to described upstream chamber wall and runner envelope wall intersection.
In such scheme, the longitudinal section of described cannelure is J-shaped shape.
In such scheme, described pump shaft being provided with runner boss, described blade is fixed on described runner boss by fillister head screw.
In such scheme, described runner boss being additionally provided with water guide cone, described water guide cone is fixedly mounted on described runner boss end by hexagon socket cap head screw.
In such scheme, described inducer and described cylinder urceolus, described cylinder urceolus and described bend loss are all bolted to connection, between described inducer and described cylinder urceolus, between described cylinder urceolus and described bend loss all by concavo-convex chimeric by the way of position.
In such scheme, described inducer, described cylinder urceolus and described bend loss are all to be sealed by O RunddichtringO.
In such scheme, being also equipped with diffuser on described pump shaft, described diffuser is positioned on pump shaft, installs a deep groove ball bearing in described diffuser, it is respectively provided with the left oil sealing of bearing and the right oil sealing of bearing at two ends, deep groove ball bearing left and right, outside described diffuser, stator is installed.
In such scheme, described pump shaft is additionally provided with angular contact ball bearing, packing ring oil sealing and shaft coupling.
The beneficial effects of the utility model: (1) this utility model runner envelope wall structure compared with traditional diagonal pumps is different, this utility model diagonal pumps runner envelope wall circumferencial direction is dispersed with cannelure.Can form backflow when fluid flows into cannelure, the backflow in cannelure can not only weaken the intensity of import department's blade-tip leakage flow with blade-tip leakage flow to a certain extent when interacting, and reduces its impact on impeller internal flowing, improves the stability of diagonal pumps.Blade-tip leakage flow peripheral speed at impeller inlet can also be weakened simultaneously, thus reduce blade-tip leakage flow to adjacent blades import to flow circumferential speed component and then to reduce the angle of attack, the effective generation suppressing stall, thus improve the stability of diagonal pumps, the appearance of suppression " hump " phenomenon.(2) cannelure can also effectively reduce the adverse pressure gradient of impeller inlet under low flow rate condition, and effectively the generation of suppression backflow, reduces flow losses.
Accompanying drawing explanation
Fig. 1 is the general assembly drawing of this utility model diagonal pumps.
Fig. 2 is that the A in Fig. 1 is to cross section left view.
Fig. 3 is partial enlarged drawing at B in Fig. 1.
Fig. 4 is unslotted and the diagonal pumps external characteristic curve figure having cannelure.
In figure: 1. inducer, 2. hexagon socket cap head screw, 3. water guide cone, 4. blade, 5. fillister head screw, 6. bolt, 7. stator, 8. cylinder urceolus, 9. bend loss, 10. mechanical seal, 11. angular contact ball bearings, 12. packing ring oil sealings, 13. shaft couplings, 14. cannelures, 15. impeller inlet limits, 16. runner envelope walls, 17. runner bosses, 18. diffusers, the 19. left oil sealings of bearing, the flat cheese head screw of hexagonal in 20., 21. deep groove ball bearings, the 22. right oil sealings of bearing, 23.O RunddichtringO, 24. pump shafts, 25. upstream chamber walls.
Detailed description of the invention
With detailed description of the invention, this utility model is described in further detail below in conjunction with the accompanying drawings.
By Fig. 1 Fig. 2 and Fig. 3 it can be seen that this diagonal pumps are by inducer 1, hexagon socket cap head screw 2, water guide cone 3, blade 4, fillister head screw 5, bolt 6, stator 7, cylinder urceolus 8, bend loss 9, mechanical seal 10, angular contact ball bearing 11, packing ring oil sealing 12, shaft coupling 13, cannelure 14, runner boss 17, diffuser 18, the left oil sealing of bearing 19, the flat cheese head screw of interior hexagonal 20, deep groove ball bearing 21, the right oil sealing of bearing 22;O RunddichtringO 23, pump shaft 24.Inducer 1 is attached fixing with cylinder urceolus 8 by bolt 6, inducer 1 and cylinder urceolus 8 by concavo-convex chimeric by the way of carry out positioning and ensureing concentricity;Cylinder urceolus 8 and bend loss 9 are also to be attached fixing by flange by bolt 6, are also the modes using concavo-convex embedding in order to ensure quick and easy for installation and concentricity the outer drum flange of accuracy cylinder and bend loss flange;The inner chamber wall of inducer 1 is made up of upstream chamber wall 25 and runner envelope wall 16 two parts, and described upstream chamber wall 25 is in the conical surface, and described runner envelope wall 16 is in cambered surface, and described runner envelope wall 16 is tangent with the internal face of described cylinder urceolus 8;Described blade 4 is positioned at the runner envelope of described inducer 1, and the impeller inlet limit 15 of described blade 4 is the most just to described upstream chamber wall 25 and runner envelope wall 16 intersection.Described upstream chamber wall 25 and runner envelope wall 16 intersection have the cannelure 14 that longitudinal section is J-shaped shape.Inducer 1, cylinder urceolus 8 and bend loss 10 are all to be sealed by O RunddichtringO 22;Water guide cone 3 hexagon socket cap head screw 2 is fixed on runner boss 17;Impeller inlet is not only carried out stream and plays guide functions by water guide cone, moreover it is possible to determine the runner boss 17 axial location on pump shaft 24;Blade 4 is fixed on runner boss 17 by fillister head screw 5;One deep groove ball bearing 21 is installed in diffuser 18, is realized the connection of stationary parts and rotatable parts by zanjon bearing;Be respectively provided with the left oil sealing of bearing 19 and the right oil sealing of bearing 22 at deep groove ball bearing about 21 two ends, the corrosion of bearing is caused in the gap preventing liquid from passing through between pump shaft 24 and diffuser 18 in entering deep groove ball bearing 21, in addition with anti-impurity effect;Angular contact ball bearing 11, packing ring oil sealing 12 and shaft coupling 13 it is additionally provided with on pump shaft 24.Shaft coupling 13 connects pump shaft 25 and machine shaft.
It is to use CFD simulation softward this utility model diagonal pumps unslotted obtained and the external characteristic curve figure having cannelure as shown in Figure 4, this utility model diagonal pumps specific speed 829r/min, inducer diameter 200mm, impeller inlet diameter 90.43mm, impeller outlet diameter 107.88mm, impeller blade number 3, the stator number of blade 5, exducer diameter 250mm, rotating speed 1450r/min, degree of depth h=1mm of groove, length l=26mm of groove.As can be seen from the figure, slot under big flow rate working conditions less to diagonal pumps performance impact, but the lift difference of the lift and unslotted having cannelure along with the reduction of flow is gradually increased, illustrate that under low flow rate condition, cannelure has obvious action to reducing diagonal pumps blade-tip leakage flow intensity, thus be greatly improved the stability of diagonal pumps fluid flow inside.

Claims (9)

1. diagonal pumps, including pump shaft (24), inducer (1), cylinder urceolus (8) and bend loss (9), described pump shaft (24) passes described cylinder urceolus (8) and described bend loss (9), blade (4) is installed on described pump shaft (24), it is characterized in that, the inner chamber wall of described inducer (1) is made up of upstream chamber wall (25) and runner envelope wall (16) two parts, described upstream chamber wall (25) is in the conical surface, described runner envelope wall (16) is in cambered surface, described runner envelope wall (16) is tangent with the internal face of described cylinder urceolus (8);Described blade (4) is positioned at the runner envelope of described inducer (1), and described upstream chamber wall (25) and runner envelope wall (16) intersection have cannelure (14).
A kind of diagonal pumps the most according to claim 1, it is characterised in that the impeller inlet limit (15) of described blade (4) is just to described upstream chamber wall (25) and runner envelope wall (16) intersection.
A kind of diagonal pumps the most according to claim 1 and 2, it is characterised in that the longitudinal section of described cannelure (14) is J-shaped shape.
A kind of diagonal pumps the most according to claim 1 and 2, it is characterised in that being provided with runner boss (17) on described pump shaft (24), described blade (4) is fixed on described runner boss (17) by fillister head screw (5).
A kind of diagonal pumps the most according to claim 4, it is characterised in that being additionally provided with water guide cone (3) on described runner boss (17), described water guide cone (3) is fixedly mounted on described runner boss (17) end by hexagon socket cap head screw (2).
A kind of diagonal pumps the most according to claim 1 and 2, it is characterized in that, described inducer (1) and described cylinder urceolus (8), described cylinder urceolus (8) and described bend loss (9) all connect by bolt (6) is fixing, between described inducer (1) and described cylinder urceolus (8), between described cylinder urceolus (8) and described bend loss (9) all by concavo-convex chimeric by the way of position.
A kind of diagonal pumps the most according to claim 6, it is characterised in that described inducer (1), described cylinder urceolus (8) and described bend loss (9) are all to be sealed by O RunddichtringO (23).
A kind of diagonal pumps the most according to claim 4, it is characterized in that, diffuser (18) it is also equipped with on described pump shaft (24), described diffuser (18) is positioned on pump shaft (24), one deep groove ball bearing (21) is installed in described diffuser (18), be respectively provided with the left oil sealing of bearing (19) and the right oil sealing of bearing (22) at deep groove ball bearing (21) two ends, left and right, described diffuser (18) outside is provided with stator (7).
A kind of diagonal pumps the most according to claim 4, it is characterised in that be additionally provided with angular contact ball bearing (11), packing ring oil sealing (12) and shaft coupling (13) on described pump shaft (24).
CN201620207697.4U 2016-03-18 2016-03-18 A kind of diagonal pumps Expired - Fee Related CN205714923U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201620207697.4U CN205714923U (en) 2016-03-18 2016-03-18 A kind of diagonal pumps

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201620207697.4U CN205714923U (en) 2016-03-18 2016-03-18 A kind of diagonal pumps

Publications (1)

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CN205714923U true CN205714923U (en) 2016-11-23

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105673553A (en) * 2016-03-18 2016-06-15 江苏大学 Diagonal flow pump
CN106932031A (en) * 2017-03-29 2017-07-07 苏州亚思科精密数控有限公司 A kind of accurate measurement fluid flowmeter
CN107063361A (en) * 2017-03-29 2017-08-18 苏州亚思科精密数控有限公司 A kind of fluid flowmeter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105673553A (en) * 2016-03-18 2016-06-15 江苏大学 Diagonal flow pump
CN106932031A (en) * 2017-03-29 2017-07-07 苏州亚思科精密数控有限公司 A kind of accurate measurement fluid flowmeter
CN107063361A (en) * 2017-03-29 2017-08-18 苏州亚思科精密数控有限公司 A kind of fluid flowmeter

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20161123

Termination date: 20180318