CN108757571B - Design method of square box type bidirectional water inlet flow passage - Google Patents

Design method of square box type bidirectional water inlet flow passage Download PDF

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CN108757571B
CN108757571B CN201810514376.2A CN201810514376A CN108757571B CN 108757571 B CN108757571 B CN 108757571B CN 201810514376 A CN201810514376 A CN 201810514376A CN 108757571 B CN108757571 B CN 108757571B
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formula
pump
water inlet
inlet
type bidirectional
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CN108757571A (en
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董亮
戈志鹏
刘厚林
代翠
王勇
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Tongxiang Zhimeng Intellectual Property Operation Co ltd
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Jiangsu University
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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
    • F04D29/406—Casings; Connections of working fluid especially adapted for liquid pumps
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/17—Mechanical parametric or variational design

Abstract

The invention provides a design method of a square box type bidirectional water inlet flow passage. Designing geometric parameters of a square box type bidirectional water inlet flow passage, wherein the geometric parameters of the square box type bidirectional water inlet flow passage comprise a proportionality coefficient K and a central height H of an impeller of a pumpwMiddle partition plate thickness BLThe water flow channel is provided with a horn-shaped pipe inletDiameter DLEtc.; the invention adopts an accurate formula design method to design the main geometric parameters of the square box type bidirectional water inlet flow passage for the pump station, can improve the operation reliability of the pump station, reduces the hydraulic loss of the water inlet flow passage of the pump station, and simultaneously prolongs the service life of the pump and the maintenance period of the pump station. The design method of the invention is different from the traditional experience method, so that the safety performance of the pump station can be effectively improved, and the pump works more stably. Moreover, the method also has good economic effect, is more favorable for being combined with a computer to be used, and enables parametric design to be possible.

Description

Design method of square box type bidirectional water inlet flow passage
Technical Field
The invention belongs to the research field of pumps, and particularly relates to a design method of a square box type bidirectional water inlet flow passage for a pump station.
Background
Under the general condition, large-scale pump station also makes the motor have better operational environment in order to reduce the construction volume simultaneously, generally unites two into one intake pond and suction pipe, is the runner of intaking promptly. The basic requirements of the water inlet flow channel are that the flow velocity distribution of the cross section of the outlet of the flow channel is uniform, the velocity circulation is zero, and the water inlet design requirements of the pump are met; the flow channel has no backflow and no harmful vortex (vortex band), thereby avoiding generating vibration, noise and the like. Whether the water inlet flow channel is reasonably designed directly influences the safety and the economical efficiency of the pump device.
The water inlet channels are in various forms, although the shapes of the water inlet channels are different, the water inlet channels are transition sections between the pump station forebay and the water pump impeller chamber, and the water inlet channels are used for better steering and accelerating the water flow in the process of entering the water pump impeller chamber from the forebay so as to meet the requirements of the water pump impeller on the water flow state of the inlet of the impeller chamber as far as possible. The water inlet channel can be divided into a one-way water inlet channel and a two-way water inlet channel according to the water inlet direction, wherein the two-way water inlet channel can feed water from four sides and has better hydraulic performance, the square box type water inlet channel belongs to two-way, and the square box type two-way water inlet channel is suitable for a vertical axial-flow pump and a guide vane type mixed flow pump and has a shape similar to a tail water pipe of a water turbine.
The two-way water inlet flow channel form of the built pump station in China can be roughly divided into an elbow butt-joint two-way water inlet flow channel (a jiajimen pump station and the like), a box culvert two-way water inlet flow channel (such as a martial door pump station and the like) and a square box type two-way water inlet flow channel (a Hebei leaf three-dial pump station and the like), the elbow butt-joint two-way water inlet flow channel simulates a one-way elbow shape, the side direction is also similar to the one-way elbow-shaped water inlet flow channel to shrink, the actual effect forms bottleneck water blocking, the range of a dead water area at one end opposite to incoming flow is expanded to the outlet of the flow channel, the flow velocity of the water inlet side; the dead water zone has a vertical backflow direction, and the strength of the dead water zone is increased along with the increase of the flow. When the box culvert type water inlet flow channel is free of the water guide cone and the partition plate, the dead water area has obvious backflow in the vertical direction and the horizontal direction, and a bottom attached vortex strip is arranged on the inner side (the side close to the dead water area) of the center vertical line of the impeller. In order to reduce backflow and prevent vortex strips from being generated in engineering, measures such as a partition plate and a water guide cone are often adopted to improve the flow state, but the shape and the additionally arranged position of the partition plate have obvious influence on the flow state and can be determined specifically through model tests. The square box type water inlet channel is characterized in that a water guide cone is arranged in a box culvert type bidirectional water inlet channel, and occupies a vortex or vortex band generation space so as to prevent the generation of the vortex. The type of bidirectional water inlet channel is similar to a unidirectional bell-shaped water inlet channel with a large rear wall distance, and water inlet is annular water inlet; and no obvious backflow and vortex band exist under the condition of reasonable profile design. Meanwhile, the square box type bidirectional water inlet flow passage has the advantages of simple structure, convenience in construction, strong bidirectional overflowing capacity and the like, but the application time is short, and the hydraulic design method is still lack of research. The invention provides a design method of a square box type bidirectional water inlet flow passage for a pump station, which aims to ensure that the hydraulic design of the square box type bidirectional water inlet flow passage is more reasonable and realize the purpose of achieving the best performance of a water pump device with the least investment.
The patent No. 201720296359.7 discloses a two-way water inlet channel, which provides a square two-way water inlet channel experimental device with excellent hydraulic performance, and the hydraulic loss in the channel is relatively smaller, which is of great significance to the stability, safety and high efficiency of the operation of a pump station. However, the main design parameters of the water inlet channel are estimated according to the experience of workers in the aspect of water conservancy, a perfect and accurate design scheme is not provided, the design method is wide and general, no pertinence exists, and the design method can be difficult to realize in many special occasions. The invention discloses a novel box culvert type bidirectional water inlet channel in a Chinese invention patent with the patent number of 201020107757.8, and also provides a design method of the bidirectional water inlet channel, so that the hydraulic loss of the bidirectional water inlet channel is reduced to a great extent. However, a specific design formula of relevant parameters of the box culvert type bidirectional water inlet channel is not provided, and only a certain value range is provided, so that the design scheme is not perfect, and the water inlet flow state of the water inlet channel is greatly influenced to a certain extent.
Disclosure of Invention
The invention aims to provide a design method of a square box type bidirectional water inlet flow channel, aiming at the problems, the invention improves the reliability and the high efficiency of the operation of a pump station by controlling relevant parameters of a box culvert, a water absorption bell mouth, a water guide cone and the like of the water inlet flow channel, simultaneously enables the pump to work more stably, and can prolong the overhaul period of the pump station. The invention not only provides an accurate design scheme of a main design parameter system, but also can be combined with a computer for application, so that parametric design becomes possible.
The technical scheme of the invention is as follows: a design method of square box type bidirectional water inlet channel for pump station includes improving several more important geometric parameters of square box type bidirectional water inlet channel including proportionality coefficient K and central height H of impeller of pumpwThe pump station comprises a water inlet flow channel, a length X from an inlet of the water inlet flow channel to a pump axis, a length P of an inlet section of the water inlet flow channel, a width B of the inlet section of the water inlet flow channel, a height M of the inlet of the water inlet flow channel, a section height hi of the inlet section of the water inlet flow channel, a section area Fi of the inlet section of the water inlet flow channel, a transition circle radius ri of the inlet section of the water inlet flow channel, an outer curvature radius R of a bent section of the water inlet flow channel, an inner curvature radius R of the bent section of the water inlet flow channel, a top gradual shrinkage angle alpha of the inlet section of the water inlet flow channel, a lower line inclination angle beta of the inlet section of the water inlet flow channel, a height l of an outlet section of the water inlet flow channel, a height N of the bent section of the water inlet flow channel and an inlet height h of the bent section of the.
Design method of square box type bidirectional water inlet flow passage and square box type bidirectional water inlet flow passageThe geometric parameters of the square box type bidirectional water inlet flow passage are designed, and the geometric parameters of the square box type bidirectional water inlet flow passage comprise a proportionality coefficient K and the impeller center height H of the pumpwMiddle partition plate thickness BLDiameter D of water flow channel flared pipe inletLThe related parameters of the pump are the diameter D of the impeller, the flow Q of the pump, the rotating speed n of the pump and the lift H of the pump, and the calculation formula is as follows:
Figure BDA0001673579000000021
Figure BDA0001673579000000022
Figure BDA0001673579000000023
DL＝(0.63K2-24.17K + 9.95). D formula IV
Figure BDA0001673579000000031
In the formula:
k is a proportionality coefficient and is a dimensionless number;
n is the rotation speed of the pump, r/min;
ω -angular velocity of pump operation, rad/s;
d-impeller diameter, m;
q-flow of the pump, m3/s；
H-pump head, m;
g-acceleration of gravity, m/s2；
Hw-the pump impeller center height, m;
DL-flare inlet diameter, m;
BLseptum thickness, m.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet channel further include the width B of the inlet section of the water inlet channeljThe design formula is as follows:
Bj＝(-0.4268×sin(0.6682Kπ)-4.093×e-0.04K+4.82)·BLformula six
In the formula:
Bjthe width of the inlet section of the water inlet channel, m;
BL-septal plate thickness, m;
k is a proportionality coefficient and is a dimensionless number.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet runner further include the inlet height H of the water inlet runnerjThe design formula is as follows:
Hj＝(0.079K2-3.051K+2.035)·Bjformula seven
In the formula:
Bjthe width of the inlet section of the water inlet channel, m;
Hj-inlet height, m, of the inlet channel;
k is a proportionality coefficient and is a dimensionless number.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet channel further include the length X from the inlet of the water inlet channel to the axis of the pumpLThe design formula is as follows:
Figure BDA0001673579000000041
in the formula:
XLthe length, m, from the inlet of the water inlet channel to the pump axis;
Hw-the pump impeller center height, m;
g-acceleration of gravity, m/s2；
H-pump head, m;
q-flow of the pump, m3/s；
ω -angular velocity of pump operation, rad/s;
k is a proportionality coefficient and is a dimensionless number.
In the above solution, the geometric parameters of the square box type bidirectional water inlet flow passage further includeDiameter d of the tip of the water cone1And the diameter d of the bottom of the water cone2Wherein the diameter d of the top of the water guide cone1Diameter d of impeller hub of water pump0Equal, bottom diameter d of the water cone2Diameter D of water suction bell mouth of water pumpLEqual, the design formula is:
d1＝d0nine-degree of expression
d2＝DLFormula ten
In the formula:
d0-impeller hub diameter, m;
DLthe diameter of the flare entrance, m.
In the above scheme, the square box type bidirectional water inlet channel further comprises geometric parameters of an inner wall line of the flared tube, namely a major axis length a and a minor axis length B in an 1/4 elliptic curve function, and the design formula is as follows:
A＝(3.043·e0.028K-1.644·e0.037)·d1formula eleven
Figure BDA0001673579000000042
In the formula:
a-major axis length of the oval line, m, of the flare's inner wall line 1/4;
b-minor axis length, m, of the elliptical line of the inner wall line 1/4 of the flare;
d1-the diameter of the top of the water cone, m;
d2-the diameter of the bottom of the water cone, m;
k is a proportionality coefficient and is a dimensionless number.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet runner further include the length B of the vortex-proof middle partition plateHThe design formula is as follows:
BH＝(2.026e0.03K-5.218)·DLthirteen formula
In the formula:
BH-vortex breaker plate length, m;
DL-flare inlet diameter, m;
k is a proportionality coefficient and is a dimensionless number.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet runner further include the height H of the horn tubeLThe design formula is as follows:
Figure BDA0001673579000000051
in the formula:
HL-flare height, m;
DL-flare inlet diameter, m;
k is a proportionality coefficient and is a dimensionless number.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet flow passage further include a distance H between the outlet of the flared tube and the central line of the impellerPThe design formula is as follows:
HP＝0.6908sin(6.82HL+32.631) formula fifteen
In the formula:
HPthe distance, m, between the bell-mouthed tube outlet and the impeller centerline;
HLthe flare height, m.
In the above scheme, the geometric parameters of the square box type bidirectional water inlet runner further include the distance H between the box culvert floor and the horn tubeBThe formula is as follows:
HB＝Hw-Hp-HLsixteen formula
In the formula:
HB-the distance, m, between the box culvert floor and the bell pipes;
Hw-the pump impeller center height, m;
HL-flare height, m;
HPthe distance between the bell-mouthed tube outlet and the impeller centre line, m.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts an accurate formula design method to design the main geometric parameters of the square box type bidirectional water inlet flow passage for the pump station, can improve the operation reliability of the pump station, reduces the hydraulic loss of the water inlet flow passage of the pump station, and simultaneously prolongs the service life of the pump and the maintenance period of the pump station. The design method of the invention is different from the traditional experience method, so that the safety performance of the pump station can be effectively improved, and the pump works more stably. Moreover, the method also has good economic effect, is more favorable for being combined with a computer to be used, and enables parametric design to be possible.
Drawings
FIG. 1 is a front view of a square box type bidirectional intake runner for a pump station;
fig. 2 is a top view of a square box type bidirectional water inlet flow passage for a pump station.
In the figure HwHeight of impeller center of pump, BLThickness of the intermediate partition, DLDiameter of water flow channel flared inlet, HjInlet height of inlet channel, XLLength of inlet channel inlet to pump axis, BjWidth of inlet section of water inlet channel, A-length of major axis of 1/4 elliptic function in inner wall line of trumpet, B-length of minor axis of 1/4 elliptic function in inner wall line of trumpet, BHLength of vortex-preventing intermediate partition plate HLHeight of Horn tube HPDistance between the flare outlet and the impeller centerline, HB-the distance between the box culvert floor and the bell pipes.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and detailed description, but the scope of the present invention is not limited thereto.
In this embodiment, a square box type bidirectional water inlet channel for a pump station is taken as an example, and fig. 1 and fig. 2 are respectively a front view and a top view of the square box type bidirectional water inlet channel for the pump station; the invention determines the main geometric parameters of a square box type bidirectional water inlet flow passage for a pump station by the following calculation formula, including the impeller center height H of the pumpwMiddle partition plate thickness BLDiameter D of water flow channel flared pipe inletLIn proportion ofNumber K, inlet height H of inlet channeljLength X from inlet of water inlet channel to axis of pumpLWidth B of inlet section of water inlet runnerjDiameter d of the tip of the water cone1Diameter d of the bottom of the water cone2Length A of long axis and length B of short axis of 1/4 elliptic function in inner wall line of horn tube, and length B of vortex-proof middle partition plateHHeight H of the horn tubeLDistance H between the outlet of the horn tube and the central line of the impellerPDistance H between box culvert floor and horn tubeBAnd the like.
In the embodiment, the main geometric parameters of the square box type bidirectional water inlet flow channel for the pump station with excellent hydraulic performance are determined according to the design working condition flow Q, the design working condition lift H, the design working condition rotating speed n and the impeller inlet diameter D of the pump for the given pump station. For example, for a certain project of pump station inlet channel design, the pump for the pump station is designed to have the working condition flow Q equal to 26m3And/s, the rated lift H is 6m, the rated rotating speed n is 120r/min, the impeller inlet diameter D is 3.1m, and the geometric shape of the double-box type water inlet runner can be easily obtained by the design method and the automatic programming of the computer. The specific geometric data of the water inlet flow channel are as follows:
Figure BDA0001673579000000061
Figure BDA0001673579000000062
Figure BDA0001673579000000063
DL＝(0.63K2-24.17K+9.95)·D＝3.76m (4)
Bj＝(-0.4268×sin(0.6682Kπ)-4.093×e-0.04K+4.82)·BL＝3.5m (6)
Hj＝(0.079K2-3.051K+2.035)·Bj＝2.37m (7)
Figure BDA0001673579000000071
d1＝d0＝0.36m (9)
d2＝DL＝3.76m (10)
A＝(3.043·e0.028K-1.644·e0.037K)·d1＝0.76m (11)
BH＝(2.026e0.03-5.218)·DL＝4.2m (13)
Figure BDA0001673579000000073
HP＝0.6908sin(6.82HL+32.631)＝0.43m (15)
HB＝Hw-Hp-HL＝0.86m (16)
taking the inlet section of the invention as an example:
Q＝26m3/s，Bjwhen Hj is 3.50m and Hj is 2.37m,
by
Figure BDA0001673579000000074
It can be obtained that v is 3.13m/s,
the hydraulic loss of the inlet section is calculated by the Darcy formula,
Figure BDA0001673579000000075
in the formula:
Hflocal hydraulic loss along the way, m;
ε -local drag coefficient;
v-average flow velocity over effective cross section in the pipe, m/s;
g-gravity additionSpeed, m/s2；
Through table lookup, a concrete pipeline is usually adopted for a large-scale pump station, namely the local resistance coefficient epsilon is 0.1, and H is obtainedfThe hydraulic loss of the flow channel designed by the traditional empirical method is almost more than 1m, so that the local hydraulic loss obtained by the design method is two orders of magnitude smaller than that designed by the traditional empirical method, and the water delivery effect is excellent.
The invention reads a plurality of groups of numerical simulation calculation results, and adopts an accurate formula design method to design the main geometric parameters of the square box type bidirectional water inlet flow passage for the pump station, thereby improving the operation reliability of the pump station, reducing the hydraulic loss of the water inlet flow passage passing through the pump station, and simultaneously prolonging the service life of the pump and the maintenance period of the pump station. The design method of the invention is different from the traditional experience method, so that the safety performance of the pump station can be effectively improved, and the pump works more stably. Moreover, the method also has good economic effect, is more favorable for being combined with a computer to be used, and enables parametric design to be possible.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (10)

1. A design method of a square box type bidirectional water inlet flow passage is characterized in that geometric parameters of the square box type bidirectional water inlet flow passage are designed, and the geometric parameters of the square box type bidirectional water inlet flow passage comprise a proportionality coefficient K and a central height H of an impeller of a pumpwMiddle partition plate thickness BLDiameter D of water flow channel flared pipe inletLThe calculation formula is as follows:
Figure FDA0002155295140000011
Figure FDA0002155295140000012
Figure FDA0002155295140000013
DL＝(0.63K2-24.17K + 9.95). D formula IV
In the formula:
k is a proportionality coefficient and is a dimensionless number;
n is the rotation speed of the pump, r/min;
ω -angular velocity of pump operation, rad/s;
d-impeller diameter, m;
q-flow of the pump, m3/s；
H-pump head, m;
g-acceleration of gravity, m/s2；
Hw-the pump impeller center height, m;
DL-flare inlet diameter, m;
BLseptum thickness, m.
2. The method of claim 1, wherein the geometric parameters of the box-type bi-directional penstock further include the width B of the penstock inducer intake sectionjThe design formula is as follows:
Bj＝(-0.4268×sin(0.6682Kπ)-4.093×e-0.04K+4.82)·BLformula six
In the formula:
Bjthe width of the inlet section of the water inlet channel, m;
BL-septal plate thickness, m;
k is a proportionality coefficient and is a dimensionless number.
3. According toThe method of claim 2, wherein the geometric parameters of the box-type bi-directional inlet further comprise the inlet height H of the inletjThe design formula is as follows:
Hj＝(0.079K2-3.051K+2.035)·Bjformula seven
In the formula:
Bjthe width of the inlet section of the water inlet channel, m;
Hj-inlet height, m, of the inlet channel;
k is a proportionality coefficient and is a dimensionless number.
4. The method of claim 1, wherein the geometric parameters of the box-type bi-directional inlet further comprise the length X from the inlet of the inlet to the pump axisLThe design formula is as follows:
Figure FDA0002155295140000021
in the formula:
XLthe length, m, from the inlet of the water inlet channel to the pump axis;
Hw-the pump impeller center height, m;
g-acceleration of gravity, m/s2；
H-pump head, m;
q-flow of the pump, m3/s；
ω -angular velocity of pump operation, rad/s;
k is a proportionality coefficient and is a dimensionless number.
5. The design method of square box type bidirectional intake runner of claim 1, wherein the geometric parameters of the square box type bidirectional intake runner further include the top diameter d of the water guide cone1And the diameter d of the bottom of the water cone2Wherein the diameter d of the top of the water guide cone1Diameter of impeller hub of water pumpd0Equal, bottom diameter d of the water cone2Diameter D of water suction bell mouth of water pumpLEqual, the design formula is:
d1＝d0nine-degree of expression
d2＝DLFormula ten
In the formula:
d0-impeller hub diameter, m;
DLthe diameter of the flare entrance, m.
6. The design method of the square box type bidirectional water inlet flow passage of claim 5, wherein the square box type bidirectional water inlet flow passage further comprises the geometric parameters of the inner wall line of the flared pipe, namely the length A of the major axis and the length B of the minor axis in the 1/4 elliptic curve function, and the design formula is as follows:
A＝(3.043·e0.028K-1.644·e0.037K)·d1formula eleven
Figure FDA0002155295140000022
In the formula:
a-major axis length of the oval line, m, of the flare's inner wall line 1/4;
b-minor axis length, m, of the elliptical line of the inner wall line 1/4 of the flare;
d1-the diameter of the top of the water cone, m;
d2-the diameter of the bottom of the water cone, m;
k is a proportionality coefficient and is a dimensionless number.
7. The design method of the square box type bidirectional intake runner of claim 1, wherein the geometric parameters of the square box type bidirectional intake runner further include the length B of the vortex breaker plateHThe design formula is as follows:
BH＝(2.026e0.03K-5.218)·DLthirteen formula
In the formula:
BH-vortex breaker plate length, m;
DL-flare inlet diameter, m;
k is a proportionality coefficient and is a dimensionless number.
8. The method of claim 1, wherein the geometric parameters of the box-type bidirectional penstock further include a flare height HLThe design formula is as follows:
Figure FDA0002155295140000031
in the formula:
HL-flare height, m;
DL-flare inlet diameter, m;
k is a proportionality coefficient and is a dimensionless number.
9. The method of claim 8, wherein the geometric parameters of the box-type bidirectional intake runner further include a distance H between the bell-mouthed outlet and the center line of the impellerPThe design formula is as follows:
HP＝0.6908sin(6.82HL+32.631) formula fifteen
In the formula:
HPthe distance, m, between the bell-mouthed tube outlet and the impeller centerline;
HLthe flare height, m.
10. The method of claim 9, wherein the geometric parameters of the square box type bidirectional intake runner further include a distance H between a box culvert floor and a bell pipeBThe formula is as follows:
HB＝Hw-Hp-HLsixteen formula
In the formula:
HB-the distance, m, between the box culvert floor and the bell pipes;
Hw-the pump impeller center height, m;
HL-flare height, m;
HPthe distance between the bell-mouthed tube outlet and the impeller centre line, m.
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CN106870462B (en) * 2017-02-17 2018-11-23 江苏大学镇江流体工程装备技术研究院 A kind of design method of the elbow inlet passage of pumping plant

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