CN106951592B - Design method of dustpan type water inlet flow channel for pump station - Google Patents

Design method of dustpan type water inlet flow channel for pump station Download PDF

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CN106951592B
CN106951592B CN201710086005.4A CN201710086005A CN106951592B CN 106951592 B CN106951592 B CN 106951592B CN 201710086005 A CN201710086005 A CN 201710086005A CN 106951592 B CN106951592 B CN 106951592B
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meter
water inlet
pump
inlet
pump station
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CN106951592A (en
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朱荣生
李扬
王学吉
付强
司翔宇
张国玉
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Jiangsu University
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Jiangsu University
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    • GPHYSICS
    • G06COMPUTING; CALCULATING; COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00Computer-aided design [CAD]
    • G06F30/10Geometric CAD
    • G06F30/17Mechanical parametric or variational design

Abstract

The invention belongs to the field of application of pump stations, and relates to a design method of a dustpan type water inlet flow channel for a pump station. The design formula of the main geometric parameters of the dustpan type water inlet flow passage for the pump station is provided, and comprises the following steps: height H from impeller center to bottom plate of water inlet flow channelwLength X from inlet of water inlet channel to axis of pumpLWidth B of inlet section of water inlet runnerjInlet height H of water inlet channeljDiameter D of horn tube inletLSuction type rear wall distance XTMiddle partition plate thickness BLMiddle partition plate thickness BTAnd the like. The dustpan type water inlet flow passage for the pump station, which is designed by the invention, can improve the running reliability of the pump station and simultaneously prolong the service life of the pump and the maintenance period of the pump station. The design method of the flow passage size is different from the traditional method adopting relative values, and has a specific design calculation formula, 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 and is more beneficial to computer programming application and computer aided design.

Description

Design method of dustpan type water inlet flow channel for pump station
Technical Field
The invention belongs to the field of application of pump stations, and particularly relates to a design method of a dustpan type water inlet runner.
Background
In order to reduce the civil engineering quantity, a large-scale pump station generally combines a water pool and a water suction pipe into a whole and adopts a specially designed water inlet flow passage. The water inlet flow channel has various forms, although the forms of the different water inlet flow channels are different, the different water inlet flow channels are transition sections between the front pool of the pump station and the water pump impeller chamber, and the functions of the water inlet flow channel are to enable water flow to be better turned and accelerated in the process of entering the water pump impeller chamber from the front pool so as to meet the hydraulic design condition required by the water pump impeller to the inlet of the impeller chamber as much as possible. The pump station water inlet flow channel is inevitably different from a water inlet flow field provided by a standard pipeline in a laboratory, and the change of the water inlet condition inevitably causes the change of the working state of a water pump in the pump device. Poor water inlet flow patterns not only reduce the efficiency of the water pump, but also reduce the cavitation performance of the water pump. Therefore, the water conservancy design of the water inlet runner directly influences the working state of the water pump, and the worse the water inlet flow state is, the greater the influence on the actual performance of the water pump is. It can be seen that the water inlet channel is an important component of the water pump device.
The water inlet channel can be divided into a unidirectional water inlet channel and a bidirectional water inlet channel according to the water inlet direction, and can be divided into an elbow type, a bell type and a dustpan type according to the shape of the unidirectional water inlet channel. The dustpan type water inlet flow channel is widely applied in European countries such as the Netherlands, is used for large, medium and small pump stations, and has the advantages of simple shape and convenient construction. In recent years, skip-type runners have been used in China. The flow channel is applied to the energy-saving technical transformation of a small pump station for the first time in suburbs of Shanghai, and the flow channel is applied to a large pump station for the first time in a Jiangsu Liulao Jian pump station, and is expected to be more applied in future. The dustpan-shaped water inlet flow channel is between the elbow-shaped flow channel and the bell-shaped flow channel in terms of basic size, the requirement on the width of the flow channel is not as strict as that of the bell-shaped flow channel, and a vortex strip is not easy to generate.
The invention discloses a dustpan type water inlet flow channel in a Chinese invention patent with the patent number of 201510329842.6, provides a dustpan type water inlet flow channel with excellent hydraulic performance, belongs to the technical field of hydraulic engineering pump stations, and has the advantages of excellent hydraulic performance and simple and convenient application method. However, it does not give a specific design formula, and thus, it is difficult to combine it with computer programming applications and computer aided design. The chinese invention patent No. 201520411029.9 discloses a dustpan type water inlet channel, which has strong adaptability to the novel dustpan type water inlet channel, but the sizes of the channels are represented by relative values, which is not accurate enough.
Disclosure of Invention
Aiming at the defects, the invention provides a design method of a dustpan type water inlet flow passage for a pump station, which not only provides an accurate design scheme of a main design parameter system, but also is greatly helpful for computer programming application and computer aided design. The invention mainly aims to design a dustpan type water inlet flow channel aiming at a pump station, and achieves the purposes of improving the reliability and the high efficiency of the operation of the pump station by controlling relevant parameters of an inlet section, a bent section, an outlet section and the like of the water inlet flow channel, simultaneously enabling the pump to work more stably and reducing the possibility of pump station accidents. And the method can be better combined with a computer to be used, so that the parameterized design is possible.
Through improving several more important geometric parameters of dustpan type water inlet channel to improve and flow and reach stability and the security that improves the pump station, realize that the technical scheme that above-mentioned purpose was adopted is:
(1) height H from impeller center to bottom plate of water inlet flow channelwThe calculation formula is as follows:
Hw=0.063×(KD)2-(KD)4×10-4+9.7×10-6×(KD)2n+4.8×10-4n-2.84 (1)
in the formula:
Hw-pump station pump impeller center height, meter;
k is the proportionality coefficient;
d, the diameter of an impeller of a pump for a pump station is meter;
n-the rotation speed of the pump for the pump station, rpm.
(2) Width B of inlet section of water inlet runnerjThe calculation formula of (a) is as follows:
in the formula:
Bj-width of inlet section of water intake runner, meter;
d, the diameter of an impeller of a pump for a pump station is meter;
q-flow of pump station, meter3In seconds.
(3) Length X from inlet of water inlet channel to pump axisLThe calculation formula of (a) is as follows:
in the formula:
XL-the length of the inlet of the water intake channel to the pump axis, meter;
k is the proportionality coefficient;
n-the rotation speed of the pump for the pump station, rotation/min;
q-flow of pump station, meter3In seconds.
(4) Diameter D of horn tube inletLThe calculation formula of (a) is as follows:
DL=10.02D-25.13Q-12.27DQ+30.73Q2+2.515 (4)
in the formula:
DL-trumpet inlet diameter, meter;
q-flow of pump station, meter3A/second;
d, the diameter of an impeller of the pump for the pump station is meter.
(5) Thickness B of the middle partition plateLThe calculation formula of (a) is as follows:
in the formula:
BL-median septum thickness, meter;
d, the diameter of an impeller of the pump for the pump station is meter.
(6) Thickness B of the middle partition plateTThe calculation formula of (a) is as follows:
in the formula:
BT-median septum thickness, meter;
d, the diameter of an impeller of the pump for the pump station is meter.
(7) The calculation formula of the proportionality coefficient K is respectively as follows:
ns-specific speed of the pump for the pump station;
h, pump lift for a pump station, rice;
n-the rotation speed of the pump for the pump station, rpm.
(8) Inlet height H of water inlet channeljThe calculation formula of (a) is as follows:
Hj=1.052×10-14+0.6Bj-5.031×10-18n+5.494×10-16Bj 2+2.034×10-18nBj(8)
in the formula:
Hj-inlet height of the water inlet channel, rice;
Bj-width of inlet section of water intake runner, meter;
n-the rotation speed of the pump for the pump station, rpm.
(9) Suction chamber rear wall distance XTThe calculation formula of (a) is as follows:
in the formula:
XT-suction chamber rear wall distance, meter;
XLthe length of the inlet of the water inlet channel from the pump axis, in meters.
(10) Radius of curvature R of lower line of suction chamber1The calculation formula of (a) is as follows:
R1=120.4sin(0.02742XT-6.842×10-6) (10)
in the formula:
R1-radius of curvature of the lower edge of the suction chamber, meter;
XT-suction chamber rear wall distance, meter.
(11) The formula for the radius of curvature R of the upper boundary of the inducer is as follows:
in the formula:
r-radius of curvature of upper boundary of inlet section, meter;
Bjwidth of inlet section of water inlet channel, meter.
(12) Radius of curvature R of rear wall of suction chamberLThe calculation formula of (a) is as follows:
in the formula:
RL-radius of curvature of the suction back wall, meter;
Bjwidth of inlet section of water inlet channel, meter.
(13) Height H of horn tubeLThe calculation formula of (a) is as follows:
in the formula:
HL-trumpet height, meter;
DL-trumpet inlet diameter, meter;
q-flow of pump station, meter3A/second;
k is the proportionality coefficient.
(14) Distance H from impeller central line to outlet of horn tubePThe calculation formula of (a) is as follows:
HP=0.6906sin(0.522HL-0.01174) (14)
in the formula:
HP-distance from impeller center line to horn outlet, meter;
HLhorn height, meter.
(15) Distance H between lower edge line and horn tubeMThe calculation formula of (a) is as follows:
in the formula:
HM-the distance between the lower edge line and the flare, in metres;
HPdistance from impeller center line to bell-mouthed tube outlet, meter.
The design method of the main geometric parameters of the dustpan type water inlet flow passage for the pump station, which is relatively perfect and accurate, can be obtained by the steps.
Drawings
Fig. 1 is a front view of a dustpan type water inlet passage for a pump station.
Fig. 2 is a plan view of a dustpan type water inlet passage for a pump station.
In the figure, HwHeight of impeller center to bottom plate of water inlet channel, XLLength of inlet channel inlet to pump axis, BjWidth of inlet section of water inlet channel, HjInlet height of inlet channel, DLDiameter of the trumpet tube inlet, XTSuction-type rear wall distance, R1Radius of curvature of the lower edge of the suction chamber, BLThickness of the intermediate partition, BTThickness of the intermediate partition, HLHeight of the trumpet, R-radius of curvature of the upper boundary of the inlet section, RLRadius of curvature of suction chamber rear wall, HPDistance from impeller center line to flare outlet, HM-the distance between the lower edge line and the flare.
Detailed description of the invention
The invention is further described with reference to the following figures and detailed description. The invention determines the main geometric parameters of a dustpan type water inlet channel for a pump station by the following calculation formula, and the method comprises the following steps: height H from impeller center to bottom plate of water inlet flow channelwLength X from inlet of water inlet channel to axis of pumpLWidth B of inlet section of water inlet runnerjInlet height H of water inlet channeljDiameter D of horn tube inletLThe distance X between the back wall of the suction chamberTRadius of curvature R of lower edge of suction chamber1Middle partition plate thickness BLMiddle partition plate thickness BTHeight H of the horn tubeLRadius of curvature R of upper boundary of inlet section, suctionRadius of curvature R of the rear wall of the insertLThe distance H from the central line of the impeller to the outlet of the horn tubePAnd the distance H between the lower edge line and the horn tubeMAnd the like.
In the embodiment, the main geometric parameters of the dustpan type water inlet flow channel for the pump station are calculated by giving the flow Q of the design working condition, the lift H of the design working condition, the rotating speed n of the design working condition and the diameter D of the impeller inlet:
Hw=0.063×(KD)2-(KD)4×10-4+9.7×10-6×(KD)2n+4.8×10-4n-2.84 (1)
DL=10.02D-25.13Q-12.27DQ+30.73Q2+2.515 (4)
Hj=1.052×10-14+0.6Bj-5.031×10-18n+5.494×10-16Bj 2+2.034×10-18nBj(8)
R1=120.4sin(0.02742XT-6.842×10-6) (10)
HP=0.6906sin(0.522HL-0.01174) (14)
taking the inlet section of the invention as an example:
when Q is 0.6m3/s,Bj=3.25m,HjWhen the thickness is equal to 1.95m,
byIt can be obtained that v is 0.09m/s,
from the darcy formula:it is possible to obtain,
and (6) looking up a table to obtain: 0.1, i.e. Hf=4.1×10-5m, the local hydraulic loss is far less than that given by the traditional technology,
in the formula: hfLocal hydraulic loss along the way, m;
-a local drag coefficient;
v-average flow velocity over effective cross section in the pipe, m/s;
g-acceleration of gravity, m/s2
The local hydraulic loss of the inlet section is smaller than that obtained by the traditional technology, and the loss calculation of other parts is similar, so that the design of the invention is more accurate and reliable.
The invention adopts an accurate formula design method to design the main geometric parameters of the dustpan type water inlet channel for the pump station, and achieves the purposes of improving the reliability and the high efficiency of the operation of the pump station by controlling the relevant parameters of an inlet section, a bent section, an outlet section and the like of the water inlet channel. 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.
In summary, although the present invention is specifically described with reference to the embodiments, the present invention is not limited to the embodiments, and includes other embodiments and modifications within the scope of the present invention.

Claims (9)

1. A design method of a dustpan type water inlet flow passage for a pump station provides main geometric parameters of the dustpan type water inlet flow passage: height H from impeller center to bottom plate of water inlet flow channelwWidth B of inlet section of water inlet runnerjLength X from inlet of water inlet channel to axis of pumpLDiameter D of horn tube inletLMiddle partition plate thickness BLMiddle partition plate thickness BTAnd the proportionality coefficient K is characterized by the following relation:
Hw=0.063×(KD)2-(KD)4×10-4+9.7×10-6×(KD)2n+4.8×10-4n-2.84 (1)
DL=10.02D-25.13Q-12.27DQ+30.73Q2+2.515 (4)
in the formula:
Hw-pump station pump impeller center height, meter;
k is the proportionality coefficient;
d, the diameter of an impeller of a pump for a pump station is meter;
Bj-width of inlet section of water intake runner, meter;
XL-the length of the inlet of the water intake channel to the pump axis, meter;
DL-trumpet inlet diameter, meter;
BL-median septum thickness, meter;
BT-median septum thickness, meter;
q-flow of pump station, meter3A/second;
n-the rotation speed of the pump for the pump station, rotation/min;
h, pump lift for a pump station, rice;
ns-specific speed of pump for pump station.
2. The design method of the dustpan type inlet channel for the pump station according to claim 1, wherein the geometric parameters of the dustpan type inlet channel further include the inlet height H of the inlet channeljThe design formula is as follows:
Hj=1.052×10-14+0.6Bj-5.031×10-18n+5.494×10-16Bj 2+2.034×10-18nBj(8)
in the formula:
Hj-inlet height of the water inlet channel, rice;
Bj-width of inlet section of water intake runner, meter;
n-the rotation speed of the pump for the pump station, rpm.
3. The pump station according to claim 1The design method of the dustpan type water inlet flow passage is characterized in that the geometric parameters of the dustpan type water inlet flow passage also comprise the distance X between the back wall of the suction chamber and the back wall of the suction chamberTThe design formula is as follows:
in the formula:
XT-suction chamber rear wall distance, meter;
XLthe length of the inlet of the water inlet channel from the pump axis, in meters.
4. The design method of the dustpan type inlet channel for the pump station according to claim 3, wherein the geometric parameters of the dustpan type inlet channel further include the curvature radius R of the lower edge of the suction chamber1The design formula is as follows:
R1=120.4sin(0.02742XT-6.842×10-6) (10)
in the formula:
R1-radius of curvature of the lower edge of the suction chamber, meter;
XT-suction chamber rear wall distance, meter.
5. The design method of the dustpan type inlet channel for the pump station according to claim 1, characterized in that the geometric parameters of the dustpan type inlet channel further include an inlet section upper boundary curvature radius R, and the design formula is as follows:
in the formula:
r-radius of curvature of upper boundary of inlet section, meter;
Bjwidth of inlet section of water inlet channel, meter.
6. The design method of the dustpan type water inlet channel for the pump station according to claim 1, characterized in that the design method is characterized in thatThe geometric parameters of the dustpan type water inlet flow passage also comprise the curvature radius R of the rear wall of the suction chamberLThe design formula is as follows:
in the formula:
RL-radius of curvature of the suction back wall, meter;
Bjwidth of inlet section of water inlet channel, meter.
7. The design method of the dustpan type inlet channel for the pump station according to claim 1, wherein the geometric parameters of the dustpan type inlet channel further include the height H of the bell-mouthed tubeLThe design formula is as follows:
in the formula:
HL-trumpet height, meter;
DL-trumpet inlet diameter, meter;
q-flow of pump station, meter3A/second;
k is the proportionality coefficient.
8. The design method of the dustpan type inlet channel for the pump station according to claim 7, wherein the geometric parameters of the dustpan type inlet channel further include the distance H from the center line of the impeller to the outlet of the bell-shaped pipePThe design formula is as follows:
HP=0.6906sin(0.522HL-0.01174) (14)
HP-distance from impeller center line to horn outlet, meter;
HLhorn height, meter.
9. The design method of the dustpan type water inlet channel for the pump station according to claim 8, wherein the design method is characterized in thatCharacterized in that the geometric parameters of the dustpan type water inlet flow channel also comprise the distance H between the lower sideline and the trumpet tubeMThe design formula is as follows:
in the formula:
HM-the distance between the lower edge line and the flare, in metres;
HPdistance from impeller center line to bell-mouthed tube outlet, meter.
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CN111691367B (en) * 2020-07-15 2021-08-10 江苏大学镇江流体工程装备技术研究院 Dustpan-shaped water inlet flow channel

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