CN108757571A - A kind of square chest type two-way water inflow passage design method - Google Patents

A kind of square chest type two-way water inflow passage design method Download PDF

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CN108757571A
CN108757571A CN201810514376.2A CN201810514376A CN108757571A CN 108757571 A CN108757571 A CN 108757571A CN 201810514376 A CN201810514376 A CN 201810514376A CN 108757571 A CN108757571 A CN 108757571A
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formula
square chest
flow channel
oviduct
pump
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CN108757571B (en
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董亮
戈志鹏
刘厚林
代翠
王勇
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Jiangsu University
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Jiangsu University
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    • 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
    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/10Geometric CAD
    • G06F30/17Mechanical parametric or variational design

Abstract

The present invention provides a kind of design method of square chest type two-way water inflow passage.The geometric parameter of other side's box type bidirectional water inlet flow channel is designed, and the geometric parameter of the square chest type two-way water inflow passage includes the impeller center height H of Proportional coefficient K, pumpw, middle block board thickness BL, water flow passage oviduct inlet diameter DLDeng;The present invention carries out a kind of design of the main geometric parameters of the square chest type two-way water inflow passage of pumping plant using accurate formula design method, it can improve the reliability of pumping station operation, the hydraulic loss by pumping plant water inlet flow channel is reduced, while extending the service life of pump and the maintenance cycle of pumping plant.Since the design method of the present invention is different from traditional empirical method, therefore the security performance of pumping plant can be effectively improved, while pump work being made more to stablize.Moreover, also there are good economic benefits, be more advantageous to computer R. concomitans, make it possible Parametric designing.

Description

A kind of square chest type two-way water inflow passage design method
Technical field
The invention belongs to the research fields of pump, and in particular to a kind of pumping plant square chest type two-way water inflow passage design method.
Background technology
Under normal conditions, large pumping station is to reduce construction volume, while motor also being made to have a relatively better working environment, and one As intake pool and suction hose are combined into one, as water inlet flow channel.Basic demand to water inlet flow channel is runner exit section stream Speed is evenly distributed, velocity circulation zero, meets pump water inlet design requirement;Without reflux, without vortex (vortex rope) is harmful in runner, avoid Generate vibration, noise etc..Water inlet flow channel reasonable design or not directly affect safety, the economy of pump installation.
There are many patterns for water inlet flow channel, and various water inlet flow channels are all Forebay of Pumping Station and water pump vane although shape differs Changeover portion between room, effect are provided to preferably turn to and add during making flow enter water pump vane room from forebay Speed, to meet water pump vane as far as possible to the condition required by blade wheel chamber's import flow-shape.Water inlet flow channel can by water inlet direction It is divided into unidirectional water inflow runner and two-way water inflow passage, wherein two-way water inflow passage can intake on four sides, there is preferable hydraulic performance, Square chest type water inlet flow channel belongs to two-way, and square chest type two-way water inflow passage is suitable for vertical-type axial-flow pump and guide-vane Mixed-flow pump, shape are similar with the draft tube of the hydraulic turbine.
The two-way water inflow passage form of the built pumping plant in China can substantially be divided into elbow to spelling formula two-way water inflow passage (wall pump of remonstrating with Stand), (Hebei leaf three dials pumping plant for box culvert-type two-way water inflow passage (such as Wuding County door pumping plant etc.) and square chest type two-way water inflow passage Deng), elbow imitates unidirectional elbow to spelling formula two-way water inflow passage, is laterally also shunk similar to unidirectional elbow inlet passage, practical to imitate Fruit shape blocks water at " bottleneck ", and one end slough range opposite with incoming prolongs expansion to runner exit, runner exit vertical centre into For water effluent speed much larger than stagnant water effluent speed, velocity flow profile is extremely uneven;Slough has vertical direction reflux, intensity to increase with flow Enhance greatly.For box culvert-type water inlet flow channel in no water guide cone and partition board, vertically and horizontally there is being apparent reflux in slough, And there is attached bottom vortex rope when (nearly slough side) on the inside of impeller center vertical line.In engineering whirlpool is flowed back and prevents to mitigate Band improves fluidised form frequently with measures such as partition board, water guide cones, but partition shape, adds position and have a significant effect to fluidised form, need to be through mould Type experiment could be determined specifically.Really water guide cone, water guide is arranged in square chest type water inlet flow channel in box culvert-type two-way water inflow passage Cone occupies whirlpool or vortex rope occurs space and prevents whirlpool from generating with this.This similar back wall distance of pattern two-way water inflow passage is very big Unidirectional bell-shaped suction box, intake for annular intake;Without apparent reflux and vortex rope in the case of Profile Design is rational.Side simultaneously The advantages that box type bidirectional water inlet flow channel is also simple in structure, easy for construction, bidirectional flow-through ability is strong, but its application time is not It is long, research is still lacked to its Hydraulic Design Method.To keep the Hydraulic Design of square chest type two-way water inflow passage more reasonable, realize with Investment as few as possible reaches best pumping plant performance, and the present invention provides a kind of two-way feed water flows of the square chest type of pumping plant The design method in road.
A kind of two-way water inflow passage is disclosed in the patent that Patent No. 201720296359.7, provides one kind The excellent square two-way water inflow passage experimental provision of hydraulic performance, keeps hydraulic loss in runner relatively smaller, this transports pumping plant Capable stability, safety and high efficiency all has very important significance.However, the main design parameters of its water inlet flow channel are According to the empirical estimating of the staff in terms of water conservancy, it is not provided with perfect accurate design scheme, and its setting of providing Meter method does not have generally specific aim, many special occasions may be difficult to achieve than broad.Patent No. 201020107757.8 Chinese invention patent in disclose a kind of novel box culvert-type two-way water inflow passage, also give a kind of two-way water inflow passage Design method, from the hydraulic loss for largely reducing two-way water inflow passage.However, its not provide box culvert-type two-way The specific design formula of water inlet flow channel relevant parameter is merely given as certain value range, therefore, design scheme and endless It is kind, have a significant impact to a certain extent to the Inlet flow pattern of water inlet flow channel.
Invention content
The purpose of the present invention is providing a kind of square chest type two-way water inflow passage design method regarding to the issue above, the present invention is logical Cross the box culvert, water suction horn mouth, the relevant parameters such as water guide cone of control water inlet flow channel reach improve pumping station operation reliability and High efficiency, while pump work being made more to stablize, and the time between overhauls(TBO) of pumping plant can be extended.The present invention, which does not only give, mainly to be set The accurate design scheme of parameter system is counted, and itself and computer R. concomitans can be made it possible Parametric designing.
The technical scheme is that:A kind of pumping plant square chest type two-way water inflow passage design method, including pass through improvement Several important geometric parameters of square chest type two-way water inflow passage include the impeller center height H of Proportional coefficient K, pumpw、 Water inlet flow channel import to the length X of pump shaft line, the length P of water inlet flow channel inducer, water inlet flow channel inducer width B, water inlet Cross-sectional area Fi, the water inlet flow channel of tunnel inlets height M, the profile height hi of water inlet flow channel inducer, water inlet flow channel inducer The transitional radius ri of inducer, the outer curvature radius R of water inlet flow channel bending section, water inlet flow channel bending section incurvature radius r, The top taper angle α of water inlet flow channel inducer, the lower sideline angle of inclination beta of water inlet flow channel inducer, the height of water inlet flow channel outlet section L, the inlet height h of the height N of water inlet flow channel bending section, water inlet flow channel bending section reaches the steady of raising pumping plant to improve flowing Qualitative and safety, in addition, it is impeller diameter that the present invention, which takes water inlet flow channel outlet diameter,.
The geometric parameter of a kind of square chest type two-way water inflow passage design method, other side's box type bidirectional water inlet flow channel is set Meter, the geometric parameter of the square chest type two-way water inflow passage includes the impeller center height H of Proportional coefficient K, pumpw, interval plate thickness Spend BL, water flow passage oviduct inlet diameter DL, the relevant parameter of pump is impeller diameter D, the rotating speed n of the flow Q of pump, pump, pump are raised Journey H, calculation formula are as follows:
DL=(0.63K2- 24.17K+9.95) D formulas four
In formula:
K --- proportionality coefficient, dimensionless number;
The rotating speed of n --- pump, r/min;
ω --- the angular speed of pump operating, rad/s;
D --- impeller diameter, m;
The flow of Q --- pump, m3/s;
The lift of H --- pump, m;
G --- acceleration of gravity, m/s2
Hw--- the impeller center height of pump, m;
DL--- oviduct inlet diameter, m;
BL--- middle block board thickness, m.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes the width of water inlet flow channel inducer Bj, design formula is:
Bj=(- 0.4268 × sin (0.6682K π) -4.093 × e-0.04K+4.82)·BLFormula six
In formula:
Bj--- the width of water inlet flow channel inducer, m;
BL--- middle block board thickness, m;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes the inlet height of water inlet flow channel Hj, design formula is:
Hj=(0.079K2-3.051K+2.035)·BjFormula seven
In formula:
Bj--- the width of water inlet flow channel inducer, m;
Hj--- water inlet flow channel inlet height, m;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes water inlet flow channel import to pump shaft line Length XL, design formula is:
In formula:
XL--- water inlet flow channel import to the length of pump shaft line, m;
Hw--- the impeller center height of pump, m;
G --- acceleration of gravity, m/s2
The lift of H --- pump, m;
The flow of Q --- pump, m3/s;
ω --- the angular speed of pump operating, rad/s;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes the top diameter d of water guide cone1With The base diameter d of water guide cone2, wherein water guide cone top diameter d1With the impeller hub diameter d of water pump0It is equal, the bottom of water guide cone Diameter d2With the water suction horn mouth diameter D of water pumpLEqual, design formula is:
d1=d0Formula nine
d2=DLFormula ten
In formula:
d0--- impeller hub diameter, m;
DL--- oviduct inlet diameter, m.
In said program, the square chest type two-way water inflow passage further includes the geometric parameter of the inner wall line of oviduct, i.e., and 1/4 Long axis length A and minor axis length B, design formula in elliptic curve function are:
A=(3.043e0.028K-1.644·e0.037)·d1Formula 11
In formula:
The long axis length of 1/4 ellipse of inner wall line of A --- oviduct, m;
The minor axis length of 1/4 ellipse of inner wall line of B --- oviduct, m;
d1--- the top diameter of water guide cone, m;
d2--- the base diameter of water guide cone, m;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes septum plate length B in anti-whirlpoolHIf Counting formula is:
BH=(2.026e0.03K-5.218)·DLFormula 13
In formula:
BH--- septum plate length in anti-whirlpool, m;
DL--- oviduct inlet diameter, m;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes oviduct height HL, design public affairs Formula is:
In formula:
HL--- oviduct height, m;
DL--- oviduct inlet diameter, m;
K --- proportionality coefficient, dimensionless number.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes oviduct outlet and impeller center The distance between line HP, design formula is:
HP=0.6908sin (6.82HL+ 32.631) formula 15
In formula:
HP--- oviduct exports the distance between impeller center line, m;
HL--- oviduct height, m.
In said program, the geometric parameter of the square chest type two-way water inflow passage further includes between box culvert floor and oviduct Distance HB, formula is:
HB=Hw-Hp-HLFormula 16
In formula:
HB--- the distance between box culvert floor and oviduct, m;
Hw--- the impeller center height of pump, m;
HL--- oviduct height, m;
HP--- oviduct exports the distance between impeller center line, m.
Compared with prior art, the beneficial effects of the invention are as follows:The present invention is carried out a kind of using accurate formula design method The design of the main geometric parameters of the square chest type two-way water inflow passage of pumping plant can improve the reliability of pumping station operation, reduce By the hydraulic loss of pumping plant water inlet flow channel, while extending the service life of pump and the maintenance cycle of pumping plant.Due to the present invention Design method be different from traditional empirical method, therefore the security performance of pumping plant can be effectively improved, while pump work being made more to stablize. Moreover, also have good economic benefits, be more advantageous to computer R. concomitans, make Parametric designing become can Energy.
Description of the drawings
Fig. 1 is a kind of front view of pumping plant square chest type two-way water inflow passage;
Fig. 2 is a kind of vertical view of pumping plant square chest type two-way water inflow passage.
H in figurewThe impeller center height of-pump, BL- middle block board thickness, DL- water flow passage oviduct inlet diameter, Hj— The inlet height of water inlet flow channel, XLThe import of-water inlet flow channel is to the length of pump shaft line, BjThe width of-water inlet flow channel inducer, A- The long axis length of 1/4 elliptic function in the inner wall line of oviduct, the short axle of 1/4 elliptic function is long in the inner wall line of B- oviducts Degree, BHSeptum plate length, H in-anti-whirlpoolL- oviduct height, HP- oviduct exports the distance between impeller center line, HB— The distance between box culvert floor and oviduct.
Specific implementation mode
Invention is further described in detail with reference to the accompanying drawings and detailed description, but protection scope of the present invention It is not limited to this.
The present embodiment is respectively pumping plant square chest type shown in Fig. 1 and Fig. 2 by taking pumping plant square chest type two-way water inflow passage as an example The front view and vertical view of two-way water inflow passage;The present invention determines that a kind of square chest type of pumping plant is double by following calculation formula To the impeller center height H of the main geometric parameters of water inlet flow channel, including pumpw, middle block board thickness BL, water flow passage oviduct import Diameter DL, Proportional coefficient K, water inlet flow channel inlet height Hj, water inlet flow channel import to pump shaft line length XL, water inlet flow channel into The width B of mouth sectionj, water guide cone top diameter d1, water guide cone base diameter d2, oviduct inner wall line in 1/4 elliptic function Long axis length A and minor axis length B, anti-whirlpool in septum plate length BH, oviduct height HL, oviduct outlet with impeller center line it Between distance HP, the distance between box culvert floor and oviduct HBDeng.
This embodiment be the design conditions flow Q pumped in given pumping plant, design conditions lift H, design conditions rotating speed n, Impeller inlet diameter D determines a kind of main geometric parameters of the pumping plant that hydraulic performance is excellent square chest type two-way water inflow passage. Such as certain project pumping plant water inlet flow channel is designed, pumping plant pump design conditions flow Q=26m3/ s, rated head H are 6m, Rated speed n is 120r/min, and impeller inlet diameter D is 3.1m, can with the design method and computer automatic programming of the present invention Easily to obtain the geometric modeling of double-box type water inlet flow channel.The specific geometric data of water inlet flow channel is as follows:
DL=(0.63K2- 24.17K+9.95) D=3.76m (4)
Bj=(- 0.4268 × sin (0.6682K π) -4.093 × e-0.04K+4.82)·BL=3.5m (6)
Hj=(0.079K2-3.051K+2.035)·Bj=2.37m (7)
d1=d0=0.36m (9)
d2=DL=3.76m (10)
A=(3.043e0.028K-1.644·e0.037K)·d1=0.76m (11)
BH=(2.026e0.03-5.218)·DL=4.2m (13)
HP=0.6908sin (6.82HL+ 32.631)=0.43m (15)
HB=Hw-Hp-HL=0.86m (16)
By taking inducer of the present invention as an example:
Q=26m3/ s, BjWhen=3.50m, Hj=2.37m,
ByIt can obtain, v=3.13m/s,
Inducer hydraulic loss is calculated by Darcy formula,
In formula:
Hf- partially along journey hydraulic loss, m;
ε-coefficient of partial resistance;
Mean flow rate in v-pipeline on effective cross-section, m/s;
G-acceleration of gravity, m/s2
Through tabling look-up, for large pumping station generally use concrete duct, i.e. coefficient of partial resistance ε=0.1, H is obtainedf= The runner hydraulic loss of 0.05m, the design of Conventional wisdom method are nearly all more than 1m, therefore the local hydraulic damage that the design method obtains Lose two orders of magnitude smaller than the hydraulic loss that Conventional wisdom method designs, water delivery excellent effect.
The present invention carries out a kind of pumping plant by the result of calculation of the multigroup numerical simulation of reading using accurate formula design method The design of the main geometric parameters of square chest type two-way water inflow passage, can improve the reliability of pumping station operation, and reduction passes through The hydraulic loss of pumping plant water inlet flow channel, while extending the service life of pump and the maintenance cycle of pumping plant.Due to setting for the present invention Meter method is different from traditional empirical method, therefore can effectively improve the security performance of pumping plant, while pump work being made more to stablize.Not only In this way, it also has good economic benefits, be more advantageous to computer R. concomitans, make it possible Parametric designing.
The series of detailed descriptions listed above is illustrated only for possible embodiments of the invention, They are all without departing from equivalent embodiment made by technical spirit of the present invention or change not to limit the scope of the invention It should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of square chest type two-way water inflow passage design method, which is characterized in that the geometric parameters of other side's box type bidirectional water inlet flow channel Number is designed, and the geometric parameter of the square chest type two-way water inflow passage includes the impeller center height H of Proportional coefficient K, pumpw、 Middle block board thickness BL, water flow passage oviduct inlet diameter DL, calculation formula is as follows:
DL=(0.63K2- 24.17K+9.95) D formulas four
In formula:
K --- proportionality coefficient, dimensionless number;
The rotating speed of n --- pump, r/min;
ω --- the angular speed of pump operating, rad/s;
D --- impeller diameter, m;
The flow of Q --- pump, m3/s;
The lift of H --- pump, m;
G --- acceleration of gravity, m/s2
Hw--- the impeller center height of pump, m;
DL--- oviduct inlet diameter, m;
BL--- middle block board thickness, m.
2. the design method of square chest type two-way water inflow passage according to claim 1, which is characterized in that the square chest type is double Further include the width B of water inlet flow channel inducer to the geometric parameter of water inlet flow channelj, design formula is:
Bj=(- 0.4268 × sin (0.6682K π) -4.093 × e-0.04K+4.82)·BLFormula six
In formula:
Bj--- the width of water inlet flow channel inducer, m;
BL--- middle block board thickness, m;
K --- proportionality coefficient, dimensionless number.
3. the design method of square chest type two-way water inflow passage according to claim 2, which is characterized in that the square chest type is double Further include the inlet height H of water inlet flow channel to the geometric parameter of water inlet flow channelj, design formula is:
Hj=(0.079K2-3.051K+2.035)·BjFormula seven
In formula:
Bj--- the width of water inlet flow channel inducer, m;
Hj--- water inlet flow channel inlet height, m;
K --- proportionality coefficient, dimensionless number.
4. the design method of square chest type two-way water inflow passage according to claim 1, which is characterized in that the square chest type is double Further include length X of the water inlet flow channel import to pump shaft line to the geometric parameter of water inlet flow channelL, design formula is:
In formula:
XL--- water inlet flow channel import to the length of pump shaft line, m;
Hw--- the impeller center height of pump, m;
G --- acceleration of gravity, m/s2
The lift of H --- pump, m;
The flow of Q --- pump, m3/s;
ω --- the angular speed of pump operating, rad/s;
K --- proportionality coefficient, dimensionless number.
5. square chest type two-way water inflow passage design method according to claim 1, which is characterized in that the square chest type is two-way The geometric parameter of water inlet flow channel further includes the top diameter d of water guide cone1With the base diameter d of water guide cone2, wherein at the top of water guide cone Diameter d1With the impeller hub diameter d of water pump0It is equal, the base diameter d of water guide cone2With the water suction horn mouth diameter D of water pumpLPhase Deng design formula is:
d1=d0Formula nine
d2=DLFormula ten
In formula:
d0--- impeller hub diameter, m;
DL--- oviduct inlet diameter, m.
6. square chest type two-way water inflow passage design method according to claim 5, which is characterized in that the square chest type is two-way Water inlet flow channel further includes the geometric parameter of the inner wall line of oviduct, i.e. long axis length A and short axle in 1/4 elliptic curve function are long B is spent, design formula is:
A=(3.043e0.028K-1.644·e0.037K)·d1Formula 11
In formula:
The long axis length of 1/4 ellipse of inner wall line of A --- oviduct, m;
The minor axis length of 1/4 ellipse of inner wall line of B --- oviduct, m;
d1--- the top diameter of water guide cone, m;
d2--- the base diameter of water guide cone, m;
K --- proportionality coefficient, dimensionless number.
7. the design method of square chest type two-way water inflow passage according to claim 1, which is characterized in that the square chest type is double Further include septum plate length B in anti-whirlpool to the geometric parameter of water inlet flow channelH, design formula is:
BH=(2.026e0.03-5.218)·DLFormula 13
In formula:
BH--- septum plate length in anti-whirlpool, m;
DL--- oviduct inlet diameter, m;
K --- proportionality coefficient, dimensionless number.
8. the design method of square chest type two-way water inflow passage according to claim 1, which is characterized in that the square chest type is double Further include oviduct height H to the geometric parameter of water inlet flow channelL, design formula is:
In formula:
HL--- oviduct height, m;
DL--- oviduct inlet diameter, m;
K --- proportionality coefficient, dimensionless number.
9. the design method of square chest type two-way water inflow passage according to claim 8, which is characterized in that the square chest type is double Further include the distance between oviduct outlet and impeller center line H to the geometric parameter of water inlet flow channelP, design formula is:
HP=0.6908sin (6.82HL+ 32.631) formula 15
In formula:
HP--- oviduct exports the distance between impeller center line, m;
HL--- oviduct height, m.
10. the design method of square chest type two-way water inflow passage according to claim 9, which is characterized in that the square chest type The geometric parameter of two-way water inflow passage further includes the distance between box culvert floor and oviduct HB, formula is:
HB=Hw-Hp-HLFormula 16
In formula:
HB--- the distance between box culvert floor and oviduct, m;
Hw--- the impeller center height of pump, m;
HL--- oviduct height, m;
HP--- oviduct exports the distance between impeller center line, m.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110593188A (en) * 2019-09-11 2019-12-20 扬州大学 Series water inlet flow passage of front-located shaft type tubular pump device and application method thereof

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CN201704726U (en) * 2010-01-28 2011-01-12 扬州大学 Novel box culvert-type two-way water inflow passage
CN204476865U (en) * 2015-01-21 2015-07-15 扬州大学 The serial inclined outlet passage of hydraulic performance excellence
CN106837855A (en) * 2017-02-08 2017-06-13 江苏大学 A kind of double suction bilayer two blade impeller and its method for designing
CN106870462A (en) * 2017-02-17 2017-06-20 江苏大学镇江流体工程装备技术研究院 A kind of method for designing of the elbow inlet passage of pumping plant
CN106897512A (en) * 2017-02-17 2017-06-27 江苏大学镇江流体工程装备技术研究院 A kind of method for designing of the bell-shaped suction box of pumping plant

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070243061A1 (en) * 2006-04-18 2007-10-18 Taylor Mark D Seal between rotor blade platforms and stator vane platforms, a rotor blade and a stator vane
CN201704726U (en) * 2010-01-28 2011-01-12 扬州大学 Novel box culvert-type two-way water inflow passage
CN204476865U (en) * 2015-01-21 2015-07-15 扬州大学 The serial inclined outlet passage of hydraulic performance excellence
CN106837855A (en) * 2017-02-08 2017-06-13 江苏大学 A kind of double suction bilayer two blade impeller and its method for designing
CN106870462A (en) * 2017-02-17 2017-06-20 江苏大学镇江流体工程装备技术研究院 A kind of method for designing of the elbow inlet passage of pumping plant
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110593188A (en) * 2019-09-11 2019-12-20 扬州大学 Series water inlet flow passage of front-located shaft type tubular pump device and application method thereof

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