CN106870462B - A kind of design method of the elbow inlet passage of pumping plant - Google Patents
A kind of design method of the elbow inlet passage of pumping plant Download PDFInfo
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- CN106870462B CN106870462B CN201710085603.XA CN201710085603A CN106870462B CN 106870462 B CN106870462 B CN 106870462B CN 201710085603 A CN201710085603 A CN 201710085603A CN 106870462 B CN106870462 B CN 106870462B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/548—Specially adapted for liquid pumps
Abstract
The invention belongs to the application fields of pumping plant, and in particular to a kind of design method of the elbow inlet passage of pumping plant.Using a kind of design formula of the main geometric parameters of the elbow inlet passage of pumping plant of the invention, including：Impeller center to water inlet flow channel bottom plate height L, the inlet height M of water inlet flow channel, Proportional coefficient K, water inlet flow channel import to pump shaft line length X, the width B of water inlet flow channel inducer, the outer curvature radius R of water inlet flow channel bending section, the incurvature radius r of water inlet flow channel bending section, 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 inlet height h of water inlet flow channel bending section, height l of water inlet flow channel outlet section etc., the stability and high efficiency of pumping station operation can not only be improved, the service life of pump and the time between overhauls(TBO) of pumping plant are extended simultaneously.Moreover, also with good economic efficiency, be more advantageous to computer R. concomitans, make it possible Parametric designing.
Description
Technical field
The invention belongs to the application field of pumping plant, in particular to a kind of design method of elbow inlet passage.
Background technique
Under normal conditions, intake pool and suction hose are generally combined into one to reduce construction volume by large pumping station, as into
Water flow passage, while motor also being made to have relatively better working environment.General large pumping station uses vertical pump, but due to vertical
The axial dimension of pump is bigger, so reducing the height of pump house and the depth of pump house bottom plate as far as possible.However, too low pump house
Height and bottom plate depth influence whether Inlet flow pattern again, in some instances it may even be possible to cause the cavitation and its vibration of water pump, and can reduce pump
The economic benefit of the operational efficiency and reduction pumping plant stood, so, there is relatively high design for the water inlet flow channel of large pumping station
It is required that.
In addition, the variation of Inlet flow pattern necessarily causes the variation of water pump in pump station working condition, Inlet flow pattern is bad not only
The working efficiency of water pump is reduced, and the anti-cavitation performance of water pump can be reduced.Since water inlet flow channel directly affects water pump vane
The flow velocity and pressure of admission section are distributed, therefore are had a significant impact to the performance of water pump.Moreover, if water inlet flow channel
Geomery selection is improper, just very possible in water inlet flow channel to generate vortex, or even will form vortex rope, once vortex rope enters water
Strong vibration will occur for pump, water pump and unit.It can be seen that water inlet flow channel is an important component of pump works,
So must design to water inlet flow channel it is very rigorous.
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 is different
Changeover portion between room, effect are provided to preferably turn to and add during making water flow enter water pump vane room from forebay
Speed, to meet water pump vane as far as possible to 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, and elbow inlet passage belongs to unidirectional, and elbow inlet passage
Suitable for vertical-type axial-flow pump and guide vane mixed flow pump, shape is similar with the draft tube of the hydraulic turbine.
A kind of elbow inlet passage is disclosed in the patent that Patent No. 201220011514.3, provides one kind
The excellent elbow inlet passage of hydraulic performance, keeps hydraulic loss in runner relatively smaller, this for pumping station operation stability,
Safety and high efficiency all have very important significance.However, the main design parameters of elbow inlet passage are according to water conservancy
The empirical estimating of the staff of aspect is not provided with and improves accurate design scheme, and its design method ratio for providing
Broad not have specific aim generally, many special occasions may be difficult to achieve.The China that Patent No. 201410369192.3
A kind of elbow inlet passage is disclosed in patent of invention, also gives a kind of design method of elbow inlet passage, from very greatly
The hydraulic loss of elbow inlet passage is reduced in degree.However, its top for not providing elbow inlet passage inducer
The design formula of taper angle, therefore, design scheme are simultaneously not perfect, have very to the Inlet flow pattern of water inlet flow channel to a certain extent
It is big to influence.
Summary of the invention
For shortcoming existing for the above, the present inventor has invented a kind of setting for the elbow inlet passage of pumping plant
Meter method, does not only give the accurate design scheme of main design parameters system, and can by itself and computer R. concomitans,
Make it possible Parametric designing.
Reach raising pumping station operation by controlling the relevant parameters such as inducer, bending section and outlet section of water inlet flow channel
Reliability and high efficiency, while keeping pump work more stable, and be able to extend the time between overhauls(TBO) of pumping plant.
To solve the above-mentioned problems, The present invention gives a kind of design methods of the elbow inlet passage of pumping plant.Pass through
Improve several important geometric parameters of elbow inlet passage, including Proportional coefficient K, impeller center to water inlet flow channel bottom plate
Height L, the length X of water inlet flow channel import to pump shaft line, the length P of water inlet flow channel inducer, water inlet flow channel inducer width
Spend the profile height h of B, water inlet flow channel inlet height M, water inlet flow channel induceri, water inlet flow channel inducer cross-sectional area Fi, into
The transitional radius r of water flow passage induceri, 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, water inlet flow channel outlet section
Height l, the height N of water inlet flow channel bending section, water inlet flow channel bending section inlet height h, reach raising pump to improve flowing
The stability and safety stood, in addition, it is impeller diameter that the invention patent, which takes water inlet flow channel outlet diameter,.
Realizing technical solution used by above-mentioned purpose is：
(1) Proportional coefficient K, the height L of impeller center to water inlet flow channel bottom plate, water inlet flow channel import to pump shaft line length
X, the length P of water inlet flow channel inducer, the calculation formula of the width B of water inlet flow channel inducer are as follows：
It is impeller diameter that the invention patent, which takes water inlet flow channel outlet diameter,
In formula：
K-proportionality coefficient；
Height of the L-impeller center to water inlet flow channel bottom plate, rice；
X-length of the water inlet flow channel import to pump shaft line, rice；
P-water inlet flow channel inducer length, rice；
B-water inlet flow channel inducer width, rice；
N-pumping plant pump revolving speed, rev/min；
D-pumping plant pump impeller diameter, rice；
Q-pumping plant pump flow, rice3/ the second；
nsThe specific speed of-pumping plant pump；
H-pumping plant pump lift, rice.
(2) calculation formula of the inlet height M of water inlet flow channel is：
M=-154.3-1.721Q+289.3B-0.002161Q2+0.8455QB-76.69B2 (6)
In formula：
M-water inlet flow channel inlet height, rice；
Q-pumping plant pump flow, rice3/ the second；
B-water inlet flow channel inducer width, rice.
(3) the profile height h of water inlet flow channel induceriCalculation formula be：
hi=202.9sin (0.000354M-0.00155)+1.024sin (0.1215M-3.477) (7)
In formula：
hiThe profile height of-water inlet flow channel inducer, rice；
M-water inlet flow channel inlet height, rice.
(4) the cross-sectional area F of water inlet flow channel induceriCalculation formula be：
Fi=-237.5B-0.8613+93.29 (8)
In formula：
FiThe cross-sectional area of-water inlet flow channel inducer, rice2；
B-water inlet flow channel inducer width, rice.
(5) the transitional radius r of water inlet flow channel induceriCalculation formula be：
In formula：
riThe transitional radius of-water inlet flow channel inducer, rice；
Q-pumping plant pump flow, rice3/ the second.
(6) the outer curvature radius R of water inlet flow channel bending section, incurvature radius r calculation formula be：
In formula：
R-water inlet flow channel bending section outer curvature radius, rice；
R-water inlet flow channel bending section incurvature radius, rice；
D-pumping plant pump impeller diameter, rice.
(7) the lower sideline angle of inclination beta of water inlet flow channel, the calculation formula of top taper angle α of water inlet flow channel inducer are：
In formula：
β-water inlet flow channel lower sideline inclination angle, degree；
α-water inlet flow channel inducer top taper angle, degree；
nsThe specific speed of-pumping plant pump；
H-pumping plant pump lift, rice；
N-pumping plant pump revolving speed, rev/min；
K-proportionality coefficient；
D-pumping plant pump impeller diameter, rice.
(8) the height l of water inlet flow channel outlet section, the calculation formula of the height N of water inlet flow channel bending section are：
N=-83.18D-6.283+4.633 (15)
In formula：
L-water inlet flow channel outlet section height, rice；
N-water inlet flow channel bending section height, rice；
Q-pumping plant pump flow, rice3/ the second；
K-proportionality coefficient；
D-pumping plant pump impeller diameter, rice.
(9) calculation formula of the inlet height h of water inlet flow channel bending section is：
In formula：
H-water inlet flow channel bending section inlet height, rice；
D-pumping plant pump impeller diameter, rice.
By the main geometric parameters of the elbow inlet passage of the accurate pumping plant of the available comparatively perfect of above step
Design method.
Beneficial effects of the present invention are：
The design method is different from Conventional wisdom method, and the present invention is to the width of inducer, height, top taper angle and following
The parameters such as line inclination angle carry out a certain proportion of adjustment, reduce inducer to the collision hydraulic loss between bending section, substantially improve
The stability of Inlet flow pattern.In addition, being optimized by outer curvature radius to bending section and incurvature radius, to drop
Low bending section is to the vortex between outlet section and along journey hydraulic loss, while but also the flow-shape of water exit end is more steady,
To improve the stability, high efficiency and economy of pumping station operation to a certain extent.
Detailed description of the invention
Fig. 1 is a kind of sectional view of the elbow inlet passage of pumping plant.
Fig. 2 is a kind of plan view of the elbow inlet passage of pumping plant.
Fig. 3 is a kind of cross-section diagram of the elbow inlet passage inducer of pumping plant.
Specific implementation method
The present invention is further described with reference to the accompanying drawings and detailed description.
The present invention determines a kind of main geometric parameters of the elbow inlet passage of pumping plant by following formula,
Including：Height L of the impeller center to water inlet flow channel bottom plate, water inlet flow channel import to the length X of pump shaft line, Proportional coefficient K, water inlet
The length P of tunnel inlets section, the width B of water inlet flow channel inducer, water inlet flow channel inlet height M, water inlet flow channel bending section it is outer
Radius of curvature R, the incurvature radius r of water inlet flow channel bending section, the lower sideline angle of inclination beta of water inlet flow channel inducer, water inlet flow channel into
The profile height h of the top taper angle α of mouthful section, water inlet flow channel induceri, height l, the water inlet flow channel of water inlet flow channel outlet section it is curved
The cross-sectional area F of the height N of tune, water inlet flow channel induceri, water inlet flow channel inducer transitional radius ri, water inlet flow channel it is curved
Inlet height h of tune etc..
This embodiment is in given design operating condition flow Q, design conditions lift H, design conditions revolving speed n, pumping plant pump
Impeller diameter D calculates the main geometric parameters of the elbow inlet passage of pumping plant a kind of：
M=-154.3-1.721Q+289.3B-0.002161Q2+0.8455QB-76.69B2 (6)
hi=202.9sin (0.000354M-0.00155)+1.024sin (0.1215M-3.477) (7)
Fi=-237.5B-0.8613+93.29 (8)
N=-83.18D-6.283+4.633 (15)
By taking inducer of the present invention as an example：
Work as Q=5m3/ s, B=3.41m, when M=2.44m,
ByIt can obtain, v=0.6m/s,
By Darcy formula：It can obtain,
It tables look-up：ε=0.1, i.e. Hf=0.0018m, this parthydraulic loss are far smaller than the water that Conventional wisdom method provides
Power loss,
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。
Therefore, the inducer parthydraulic loss that the present invention provides more may be used than the hydraulic loss that Conventional wisdom method obtains
It leans on, other each section hydraulic loss algorithms are similarly.
The present invention carries out a kind of main geometric parameters of the elbow inlet passage of pumping plant using accurate formula design method
Design, the reliability of pumping station operation can be improved, while extending the service life of pump and the maintenance cycle of pumping plant.Due to this
The design method of invention is different from traditional empirical method, therefore can effectively improve the security performance of pumping plant, while making pump work more
Stablize.Moreover, also there are good economic benefits, be more advantageous to computer R. concomitans, make Parametric designing at
It is possible.
In conclusion illustrated for the invention patent referring to what embodiment was made, but the invention is not limited to upper
Embodiment is stated, also comprising the other embodiments and variation within the scope of present inventive concept.
Claims (9)
1. a kind of design method of the elbow inlet passage of pumping plant, which is characterized in that the elbow inlet passage it is main several
What parameter include Proportional coefficient K, the height L of impeller center to water inlet flow channel bottom plate, water inlet flow channel import to pump shaft line length
X, the width B of the length P of water inlet flow channel inducer, water inlet flow channel inducer, taking water inlet flow channel outlet diameter is impeller diameter, meter
It is as follows to calculate formula：
In formula：
K-proportionality coefficient；
Height of the L-impeller center to water inlet flow channel bottom plate, rice；
X-length of the water inlet flow channel import to pump shaft line, rice；
P-water inlet flow channel inducer length, rice；
B-water inlet flow channel inducer width, rice；
N-pumping plant pump revolving speed, rev/min；
D-pumping plant pump impeller diameter, rice；
Q-pumping plant pump flow, rice3/ the second；
nsThe specific speed of-pumping plant pump；
H-pumping plant pump lift, rice.
2. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the inlet height M of water inlet flow channel, and design formula is：
M=-154.3-1.721Q+289.3B-0.002161Q2+0.8455QB-76.69B2 (6)
In formula：
M-water inlet flow channel inlet height, rice；
Q-pumping plant pump flow, rice3/ the second；
B-water inlet flow channel inducer width, rice.
3. a kind of design method of the elbow inlet passage of pumping plant according to claim 2, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the profile height h of water inlet flow channel induceri, design formula is：
hi=202.9sin (0.000354M-0.00155)+1.024sin (0.1215M-3.477) (7)
In formula：
hiThe profile height of-water inlet flow channel inducer, rice；
M-water inlet flow channel inlet height, rice.
4. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the cross-sectional area F of water inlet flow channel induceri, design formula is：
Fi=-237.5B-0.8613+93.29 (8)
In formula：
FiThe cross-sectional area of-water inlet flow channel inducer, rice2；
B-water inlet flow channel inducer width, rice.
5. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the transitional radius r of water inlet flow channel induceri, design formula is：
In formula：
riThe transitional radius of-water inlet flow channel inducer, rice；
Q-pumping plant pump flow, rice3/ the second.
6. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the outer curvature radius R of water inlet flow channel bending section, incurvature radius r, and design formula is：
In formula：
R-water inlet flow channel bending section outer curvature radius, rice；
R-water inlet flow channel bending section incurvature radius, rice；
D-pumping plant pump impeller diameter, rice.
7. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the top taper angle α of the lower sideline angle of inclination beta of water inlet flow channel, water inlet flow channel inducer,
Design formula is：
In formula：
β-water inlet flow channel lower sideline inclination angle, degree；
α-water inlet flow channel inducer top taper angle, degree；
nsThe specific speed of-pumping plant pump；
H-pumping plant pump lift, rice；
N-pumping plant pump revolving speed, rev/min；
K-proportionality coefficient；
D-pumping plant pump impeller diameter, rice.
8. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the height N of the height l of water inlet flow channel outlet section, water inlet flow channel bending section, and design is public
Formula is：
N=-83.18D-6.283+4.633 (15)
In formula：
L-water inlet flow channel outlet section height, rice；
N-water inlet flow channel bending section height, rice；
Q-pumping plant pump flow, rice3/ the second；
K-proportionality coefficient；
D-pumping plant pump impeller diameter, rice.
9. a kind of design method of the elbow inlet passage of pumping plant according to claim 1, which is characterized in that the elbow
The geometric parameter of shape water inlet flow channel further includes the inlet height h of water inlet flow channel bending section, and design formula is：
In formula：
H-water inlet flow channel bending section inlet height, rice；
D-pumping plant pump impeller diameter, rice.
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| CN108757571B (en) * | 2018-05-25 | 2020-01-24 | 江苏大学 | Design method of square box type bidirectional water inlet flow passage |
| CN114595523B (en) * | 2021-09-08 | 2023-10-10 | 江苏大学镇江流体工程装备技术研究院 | Elbow-shaped water outlet flow passage hydraulic design method based on Dien vortex theory |
| CN113915045B (en) * | 2021-10-18 | 2023-04-28 | 扬州大学 | Mixed-flow water turbine draft tube with inclined bent cone |
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| JPH07127593A (en) * | 1993-11-05 | 1995-05-16 | Hitachi Ltd | Vertical shaft pump |
| CN202441654U (en) * | 2012-01-12 | 2012-09-19 | 姚文泉 | Elbow-shaped water inlet flow channel |
| CN104132000B (en) * | 2014-07-30 | 2015-05-20 | 扬州大学 | Elbow-shaped water inlet conduit with excellent hydraulic performance and application method thereof |
| CN104373387B (en) * | 2014-10-27 | 2015-08-19 | 扬州大学 | A kind of bell-shaped suction box of hydraulic performance excellence and application process thereof |
| CN104895145B (en) * | 2015-06-15 | 2016-06-01 | 扬州大学 | The dustpan-shaped inlet conduit of a kind of hydraulic performance excellence and application method thereof |
| CN105574288B (en) * | 2016-01-12 | 2017-05-17 | 扬州大学 | Method for designing water inlet conduit three-dimensional body flow surface of high-performance large-flow pump station |
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