CN104373387B - A kind of bell-shaped suction box of hydraulic performance excellence and application process thereof - Google Patents

A kind of bell-shaped suction box of hydraulic performance excellence and application process thereof Download PDF

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Publication number
CN104373387B
CN104373387B CN201410583895.6A CN201410583895A CN104373387B CN 104373387 B CN104373387 B CN 104373387B CN 201410583895 A CN201410583895 A CN 201410583895A CN 104373387 B CN104373387 B CN 104373387B
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bell
round platform
suction box
diameter
shaped suction
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CN104373387A (en
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陆林广
徐磊
陆伟刚
李亚楠
王海
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Yangzhou University
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Yangzhou 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

Abstract

The bell-shaped suction box of hydraulic performance excellence and an application process thereof, belong to hydraulic engineering pumping plant technical field.Described bell-shaped suction box is provided with straight entry section, the bell section of turning to and round platform rectification section along water (flow) direction, and each section has different geometric properties and effect; The described bell section of turning to geometrical body complexity, that to be bell, bottom be shaped upper part is flat, plane shape is scroll casing shape, interiorly arrange water guide round platform, provides detailed polar coordinate representation figure and data sheet; The all sizes of described bell-shaped suction box all represent (with water pump vane diameter D for reference value) by relative value; The major parameter of described straight entry section and round platform rectification section can adjust within the specific limits according to the actual demand of pumping plant, to adapt to the requirement of different pumping plant.Bell-shaped suction box hydraulic performance provided by the invention is excellent, using method is easy, can ensure the designing quality of every pumping plant bell-shaped suction box, for guarantee the safe, stable of pumping plant and Effec-tive Function significant.

Description

A kind of bell-shaped suction box of hydraulic performance excellence and application process thereof
Technical field
The invention belongs to hydraulic engineering pumping plant technical field, be specifically related to a kind of bell-shaped suction box and application process thereof of hydraulic performance excellence, be mainly used in instructing numerous engineers and technicians to design the bell-shaped suction box of hydraulic performance excellence, the designing quality of every pumping plant bell-shaped suction box can be ensured, for guarantee the safe, stable of large pumping station and Effec-tive Function significant.
Background technique
Bell-shaped suction box is that more water inlet flow channel applied by the vertical pumping plant of big-and-middle-sized low lift, be specially adapted to the pumping plant that foundation condition is poor, be unsuitable for the side of deep-cutting, its effect guides current turn in order in the process flowing to water pump vane room from forebay and evenly accelerate, for the import of water pump vane room provides satisfactory fluidised form.The bell-shaped suction box of design hydraulic performance excellence is the necessary condition ensureing water pump safety, stable and Effec-tive Function.Bell-shaped suction box three-dimensional body is complicated, its design method adopts traditional geometrograph for a long time, seriously disconnect with the Three dimensional Turbulent Flow situation of current in bell-shaped suction box, designed runner can not meet the requirement of water pump vane to water inlet flow field, sometimes even can cause producing vortex rope in runner, have a strong impact on the stable operation of water pump assembly.
Summary of the invention
The object of this invention is to provide a kind of bell-shaped suction box and application process thereof of hydraulic performance excellence.The bell-shaped suction box flow direction-changing that application the present invention obtains is orderly, and without harmful fluidised form in runner, hydraulic performance is excellent, can be the import of water pump vane room and provides satisfactory fluidised form.
First object of the present invention is achieved through the following technical solutions, a kind of bell-shaped suction box of hydraulic performance excellence, it is provided with straight entry section, the bell section of turning to and round platform rectification section 3 sections along water (flow) direction, and each section has different geometric properties and effect; Dividing pier in arranging in straight entry section, arranges water guide round platform in the bell section of turning to;
Each physical dimension of described bell-shaped suction box represents (with water pump vane diameter D for reference value, the unit of D is m, lower same) with relative value, and its length L is 4.1D, entrance width B 1for 2.85D, height H are 1.4D; Described straight entry section is positioned at described bell-shaped suction box foremost, and its inside is provided with middle dividing pier, and the upper and lower sideline of runner and plane shape line are straight line, and section configuration is rectangle, length L jkfor 3.07D, entrance width B 1for 2.85D, inlet height H 1for 1.52D, base angle of inclination beta are 5 °, import top board radius of arc R=0.25D+0.2m, the length L of described middle dividing pier gfor 2.5D, thickness B g=0.174D+0.191m, head radius of arc R g1=0.48D, afterbody radius of arc R g2=2.86D, its flow channels is made up of runner inner wall and middle dividing pier outer wall, and the effect of this section guides current to enter runner from Forebay of Pumping Station, meets the requirement that pump house superstructure is arranged simultaneously;
After the described bell section of turning to is positioned at straight entry section, it is characterized in that shaped upper part to be bell, bottom be that flat, plane shape is scroll casing shape, its inside is provided with water guide round platform, this segment length L zxfor 1.89D, height H zxfor 0.97D, entrance width B 2for 2.85D, inlet height H 2for 0.91D, the base diameter D of described water guide round platform dfor 1.32D, upper diameter D sfor 1.1D l(D lfor the diameter of water pump vane hub body blade wheel chamber admission section, D lunit be m, lower with), height H zxfor 0.97D, its flow channels is made up of runner inner wall and water guide round platform outer wall, for accurately expressing the three-dimensional body of this section, provide polar coordinate representation figure and the data sheet of this section of bell-shaped curve, plane scroll casing shape curve and water guide round platform curve, the data sheet of bell-shaped curve comprises coordinate points numbering, angle [alpha] ziand radius R zi, the data sheet of plane spiral case curve comprises coordinate points numbering, angle [alpha] wiand radius R wi, the data sheet of water guide round platform curve comprises coordinate points numbering, angle [alpha] diand radius R di, the effect of this section guides current to do 90 ° in an orderly manner turn to and accelerate, and ensure in the process harmful fluidised form not to occur;
After described round platform rectification section is positioned at the bell section of turning to, it is characterized in that flow channels is made up of runner inner wall and round platform outer wall, the shape of generatrix of its inside and outside wall is straight line, its height H zlthe inner diameter D of=0.1065D+0.4367m, outlet n2with outer diameter D w2be respectively 0.88D and D l, its import inner diameter D n1for 0.94D, import outer diameter are D w1, D w1with the upper diameter D of water guide round platform sequal, the effect of this section does last adjustment and acceleration to the current flowing to water pump vane room, to enter blade wheel chamber with ensureing uniform fluid flow.
Second object of the present invention is achieved through the following technical solutions, and a kind of application process of bell-shaped suction box of hydraulic performance excellence, comprises the following steps:
(1) bell-shaped suction box is provided with straight entry section, the bell section of turning to and round platform rectification section 3 sections successively along water (flow) direction, and the relative value that all to adopt with water pump vane diameter D by the physical dimension of each section be reference value represents; Described bell-shaped suction box length L is 4.1D, entrance width B 1for 2.85D, height H are 1.4D; Described straight entry section is positioned at described bell-shaped suction box foremost, it is characterized in that inside is provided with middle dividing pier, and the upper and lower sideline of runner and plane shape line are straight line, and section configuration is rectangle, its length L jkfor 3.07D, entrance width B 1for 2.85D, inlet height H 1for 1.52D, base angle of inclination beta are 5 °, import top board radius of arc R=0.25D+0.2m, the length L of described middle dividing pier gfor 2.5D, thickness B g=0.174D+0.191m, head radius of arc R g1=0.48D, afterbody radius of arc R g2=2.86D, its flow channels is made up of runner inner wall and middle dividing pier outer wall, and the effect of this section guides current to enter runner from Forebay of Pumping Station, meets the requirement that pump house superstructure is arranged simultaneously;
After the described bell section of turning to is positioned at straight entry section, it is characterized in that shaped upper part to be bell, bottom be that flat, plane shape is scroll casing shape, its inside is provided with water guide round platform, this segment length L zxfor 1.89D, height H zxfor 0.97D, entrance width B 2for 2.85D, inlet height H 2for 0.91D, the base diameter D of described water guide round platform dfor 1.32D, upper diameter D sfor 1.1D ld l, height H zxfor 0.97D, its flow channels is made up of runner inner wall and water guide round platform outer wall, and the bell-shaped curve of this section, plane spiral case curve and water guide round platform curve all provide polar coordinate representation figure and data sheet, and the data sheet of bell-shaped curve comprises coordinate points numbering, angle [alpha] ziand radius R zi, the data sheet of plane spiral case curve comprises coordinate points numbering, angle [alpha] wiand radius R wi, the data sheet of water guide round platform curve comprises coordinate points numbering, angle [alpha] diand radius R di, the effect of this section guides current to do 90 ° in an orderly manner turn to and accelerate, and ensure in the process harmful fluidised form not to occur;
After described round platform rectification section is positioned at the bell section of turning to, it is characterized in that flow channels is made up of runner inner wall and round platform outer wall, the shape of generatrix of its inside and outside wall is straight line, its height H zlthe inner diameter D of=0.1065D+0.4367m, outlet n2with outer diameter D w2be respectively 0.88D and D l, its import inner diameter D n1for 0.94D, import outer diameter are D w1(with the upper diameter D of water guide round platform sequal), the effect of this section does last adjustment and acceleration to the current flowing to water pump vane room, to enter blade wheel chamber with ensureing uniform fluid flow;
(2) the straight entry section utilizing step (1) to determine, the bell section of turning to and round platform rectification section geometric parameter, calculate the actual required size of this pumping plant water inlet flow channel according to the water pump vane diameter D that pumping plant is intended adopting;
(3) height H of round platform rectification section is determined according to step (2) zl, the actual demand according to pumping plant strengthens or reduces H on the basis of step (2) zl, adjustment H zltime, the inner diameter D of this section of import n1with outer diameter D w1, outlet inner diameter D n2with outer diameter D w2all remain unchanged;
(4) the length L of straight entry section is determined according to step (2) jk, lengthen on the basis of step (3) according to the needs that pumping plant superstructure is arranged or shorten L jk, at adjustment L jkwhile the length L of the described middle dividing pier of corresponding adjustment g, adjustment L jkand L gtime, tunnel inlets height H 1remain unchanged;
(5) determine the base angle of inclination beta of straight entry section according to step (2), strengthen according to the needs that this section is connected with Forebay of Pumping Station or reduce β on the basis of step (4), during adjustment β, the height of this section of each section remains unchanged;
(6) according to the geometric parameter of the described bell-shaped suction box converted and after adjustment, in mapping software, required bell-shaped suction box single line drawing is drawn;
According to step (3), (4), (5) to round platform rectification section H zlwith straight entry section L jk, L g, β is when adjusting, and do not change the geometric parameter of the determined bell section of turning to of step (2).
Compared with prior art, the present invention has following beneficial effect:
The first, bell-shaped suction box hydraulic performance of the present invention is excellent, and using method is easy, studying, being convenient to numerous engineers and technicians and adopting without the need to carrying out the complicated Optimum Hydraulic Design based on CFD; The quality of every pumping plant bell-shaped suction box design can be ensured, for guarantee the safe, stable of large pumping station and Effec-tive Function significant.
The second, bell-shaped suction box provided by the invention is provided with straight entry section, the bell section of turning to and round platform rectification section 3 sections along water (flow) direction, and dividing pier in arranging in straight entry section, arranges water guide round platform in the bell section of turning to; Described straight entry section is for guiding Forebay of Pumping Station incoming flow, and described middle dividing pier is for eliminating the transverse flow speed in the incoming flow of forebay; The effect of the described bell section of turning to guides current to do 90 ° in an orderly manner turn to and accelerate, and current can be made to avoid harmful fluidised form such as attached wall vortex rope, vortex rope of the attached end occurs in work 90 ° of processes turned to; Described round platform rectification section is used for the current that adjustment further flows into from the bell section of turning to, and makes it flow to the import of water pump vane room even, straightly; In order, evenly, without harmful fluidised form in runner, hydraulic performance is excellent for the bell-shaped suction box flow direction-changing that application the present invention obtains.
3rd, according to the statistics to built pumping plant bell-shaped suction box key dimension, relative value (with water pump vane diameter D for the reference value) difference of its length, width and height is less, bell-shaped suction box strong adaptability provided by the invention; The all sizes of runner all represent by relative value, for general big-and-middle-sized vertical pumping plant, these relative values are multiplied by water pump vane diameter D and can obtain required channel size; The length of runner, height and inclination angle, base can adjust within the specific limits according to the actual demand of pumping plant.
4th, bell-shaped suction box hydraulic performance provided by the invention is excellent: 1. according to for many years to the achievement in research of bell-shaped suction box, selects wherein through abundant Optimum Hydraulic Design and strict testing property and the bell-shaped suction box of application of succeeding; 2. the main hydraulic performance index of described bell-shaped suction box is as follows: runner exit velocity flow profile uniformity V u>=97%; Runner exit current enter the average angle of water pump vane room runner loss of head Δ h≤0.15m during design discharge.
Accompanying drawing explanation
Fig. 1 a is the longitudinal section schematic diagram of bell-shaped suction box single line drawing of the present invention;
Fig. 1 b is the floor map of bell-shaped suction box single line drawing of the present invention;
Fig. 2 a is bell-shaped suction box bell-shaped curve schematic diagram of the present invention;
Fig. 2 b is bell-shaped suction box plane spiral case curve synoptic diagram of the present invention;
Fig. 2 c is bell-shaped suction box water guide round platform curve synoptic diagram of the present invention;
Fig. 3 is the longitudinal section schematic diagram of bell-shaped suction box Level Change of the present invention;
Fig. 4 a is the longitudinal section schematic diagram that bell-shaped suction box length of the present invention changes;
Fig. 4 b is the floor map that bell-shaped suction box length of the present invention changes;
Fig. 5 is the longitudinal section schematic diagram that inclination angle, bell-shaped suction box base of the present invention changes.
In figure: 1 straight entry section, the 2 bell sections of turning to, 3 round platform rectification sections, dividing pier in 4,5 water guide round platforms, 6 bell-shaped curves, 7 plane spiral case curves, 8 water guide round platform curves, 9 pump spindle center lines, 10 impeller central lines.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Object of the present invention: (1) provides a kind of and can be applicable to the bell-shaped suction box that foundation condition is poor, be unsuitable for the side's of deep-cutting pumping plant, this runner is through strict test, prove that its hydraulic performance is excellent, and obtain general successful Application at the large pumping station being unsuitable for the side of deep-cutting; (2) bell-shaped suction box provided is provided with straight entry section 1, the bell section of turning to 2 and round platform rectification section 3 along water (flow) direction, dividing pier 4 in arranging in straight entry section 1, in the bell section of turning to 2, water guide round platform 5 is set, wherein, straight entry section 1 and round platform rectification section 3 provide span, and the bell section of turning to 2 of geometrical body complexity provides polar coordinate representation figure and the data sheet of detailed bell-shaped curve 6, plane spiral case curve 7 and water guide round platform curve 8; (3) the runner physical dimension provided all represents (with water pump vane diameter D for reference value) with relative value, each for described bell-shaped suction box physical dimension relative value is multiplied by pumping plant intend the water pump vane diameter D adopted the actual required size of this pumping plant water inlet flow channel; (4) geometric parameter of straight entry section 1 and round platform rectification section 3 can adjust within the specific limits according to the actual demand of pumping plant, to adapt to the difference needs of different pumping plant to main geometric parameters such as flow channel length, height and inclination angles, base; (5) adjustment of straight entry section 1 and round platform rectification section 3 geometric parameter does not change the geometric parameter of the bell section of turning to 2.
(1) the bell-shaped suction box hydraulic performance provided is excellent;
1. according to for many years to the achievement in research of bell-shaped suction box, select wherein through abundant Optimum Hydraulic Design and strict testing property and the bell-shaped suction box of application of succeeding;
2. the main hydraulic performance index of described bell-shaped suction box is as follows:
Runner exit water velocity distribution consistency degree V u>=97%;
Runner exit current enter the average angle of water pump vane room
The runner loss of head Δ h≤0.15m of design discharge.
(2) the bell-shaped suction box geometrical body presentation provided;
1. described bell-shaped suction box is divided into straight entry section 1, the bell section of turning to 2 and round platform rectification section 3 along water (flow) direction, dividing pier 4 in arranging in straight entry section 1, in the bell section of turning to 2, arrange water guide round platform 5;
2. the described bell section of turning to 2 geometrical body is complicated, it is the core of bell-shaped suction box design, its effect makes current carry out 90 ° in an orderly manner to turn to, current are that 4 directional steerings 90 ° enter from front, rear, left and right in this section, fluidised form is comparatively complicated, the quality of this section of the Hydraulic Design is very large on the impact of runner hydraulic performance, designs improper even may causing attached wall vortex rope or vortex rope of the attached end occur, thus badly influences the safety and stability of water pump; This section of geometric parameter comprises length L zx, height H zx, entrance width B 2with inlet height H 2, for accurately expressing the three-dimensional body of this section, provide polar coordinate representation figure and the data sheet of bell-shaped curve 6, plane spiral case curve 7 and water guide round platform curve 8, the data sheet of bell-shaped curve 6 comprises coordinate points numbering, angle [alpha] ziand radius R zi, the data sheet of plane spiral case curve 7 comprises coordinate points numbering, angle [alpha] wiand radius R wi, the data sheet of water guide round platform curve 8 comprises coordinate points numbering, angle [alpha] diand radius R di;
3. before described straight entry section 1 is positioned at the bell section of turning to 2, be the changeover portion between Forebay of Pumping Station and the bell section of turning to 2, the geometric parameter of this section comprises runner straight entry segment length L jk, entrance width B 1, inlet height H 1, base angle of inclination beta, tunnel inlets top board radius of arc R;
4., after described round platform rectification section 3 is positioned at the bell section of turning to 2, its effect carries out last rectification and acceleration, its Hydraulic Design convection current road outlet stream velocity flow profile uniformity V to the current flowed out from the bell section of turning to 2 uthe average angle of water pump vane room is entered with current impact is very large, and the geometric parameter of this section comprises frustum cone height H zl, import inner diameter D n1with outer diameter D w1, outlet inner diameter D n2with outer diameter D w2;
5. dividing pier 4 in arranging in described straight entry section 1, its effect mainly meets the needs that flow passage structure is arranged, is also conducive to adjusting the current entering runner from forebay simultaneously; Described middle dividing pier 4 is divided into head arc section, middle part straight section and afterbody arc section, and its geometric parameter comprises middle dividing pier length L g, thickness B g, head radius of arc R g1, afterbody radius of arc R g2;
6. in the described bell section of turning to 2, arrange water guide round platform 5, its effect is that its geometric parameter comprises the base diameter D of described water guide round platform 5 for stoping the below of the bell section of turning to 2 to produce the vortex rope of the attached end that water pump can be caused to vibrate d, upper diameter D s, height H zxwith water guide round platform curve 8.
(3) the bell-shaped suction box application process being convenient to promote is set up;
1. each for described bell-shaped suction box physical dimension relative value being multiplied by water pump vane diameter D that pumping plant intends adopting must size needed for this pumping plant water inlet flow channel reality;
2. the height H of round platform rectification section 3 is 1. determined according to step zl, strengthen on step basis 1. according to the actual demand of pumping plant or reduce H zl, adjustment H zltime, the inner diameter D of this section of import n1with outer diameter D w1, outlet inner diameter D n2with outer diameter D w2all remain unchanged;
3. the length L of straight entry section 1 is 1. determined according to step jk, lengthen on step basis 2. according to the needs that pumping plant superstructure is arranged or shorten L jk, at adjustment L jkwhile the length L of the described middle dividing pier 4 of corresponding adjustment g, adjustment L jkand L gtime, tunnel inlets height H 1remain unchanged;
4. 1. determine the base angle of inclination beta of straight entry section 1 according to step, the needs be connected with Forebay of Pumping Station according to this section strengthen or reduce β on step basis 3., and during adjustment β, the height of this section of each section remains unchanged;
5. according to the geometric parameter of the described bell-shaped suction box converted and after adjustment, in mapping software, required bell-shaped suction box single line drawing is drawn;
According to step 2., 3., 4. to the H of round platform rectification section 3 zlwith the L of straight entry section 1 jk, L g, β is when adjusting, and do not change the geometric parameter of the step 1. determined bell section of turning to 2.
Embodiment 1
(1) bell-shaped suction box of the present invention is as follows:
With water pump vane diameter D for reference value.Bell-shaped suction box length L provided by the invention is 4.1D, entrance width B 12.85D and 1.4D is respectively with height H; The length L of described straight entry section 1 jkfor 3.07D, entrance width B 1for 2.85D, inlet height H 1for 1.52D, base angle of inclination beta are 5 °, import top board radius of arc R=0.25D+0.2m, the length L of middle dividing pier 4 gfor 2.5D, thickness B g=0.174D+0.191m, head radius of arc R g1=0.48D, afterbody radius of arc R g2=2.86D; The length L of the described bell section of turning to 2 zxfor 1.89D, height H zxfor 0.97D, entrance width B 2for 2.85D, inlet height H 2for 0.91D, the base diameter D of water guide round platform 5 dfor 1.32D, upper diameter D sfor 1.1D ld l, height H zxfor 0.97D, numbering, the angle [alpha] of this section of each coordinate points of bell-shaped curve 6 ziand radius R ziin table 1, each coordinate points position as shown in Figure 2 a (distance of true origin O and pump spindle center line 9 be 0.678D, be 0.429D with the distance of impeller central line 10), numbering, the angle [alpha] of each coordinate points of plane spiral case curve 7 wiand radius R wiin table 2, each coordinate points position is (true origin O is positioned at the intersection point of pump spindle center line 9 and round platform rectification section 3 Outlet Section) as shown in Figure 2 b, numbering, the angle [alpha] of each coordinate points of water guide round platform curve 8 diand radius R diin table 3, each coordinate points position as shown in Figure 2 c (distance of true origin O and pump spindle center line 9 be 0.662D, be 0.429D with the distance of impeller central line 10); The height H of described round platform rectification section 3 zlthe inner diameter D of=0.1065D+0.4367m, outlet n2with outer diameter D w2be respectively 0.88D and D l, its import inner diameter D n1for 0.94D, import outer diameter are D w1(with the upper diameter D of water guide round platform sequal); In table 1, table 2 and table 3, the radius of each coordinate points is relative value (with water pump vane diameter D for reference value).
The data sheet of the bell section of the turning to bell-shaped curve of table 1
The data sheet of the table 2 bell section of turning to plane spiral case curve
The data sheet of the table 3 bell section of turning to water guide round platform curve
(2) application process of the present invention is as follows:
1. the relative value of each for described bell-shaped suction box physical dimension being multiplied by water pump vane diameter D that pumping plant intends adopting must size needed for this pumping plant water inlet flow channel reality, and the coordinate points data of the bell-shaped curve 6 of the bell section of turning to 2 of described bell-shaped suction box, plane spiral case curve 7 and water guide round platform curve 8 can be called in excel form and be carried out unifying process;
2. the height H of described bell-shaped suction box round platform rectification section 3 is 1. determined according to step zl=0.1065D+0.4367m, strengthens according to the actual demand of pumping plant or reduces H on step basis 1. zl, adjustment H zlthe inner diameter D of Shi Yuantai rectification section 3 import n1with outer diameter D w1, outlet inner diameter D n2with outer diameter D w2remain unchanged; Adjustment mode as shown in Figure 3, H ' in figure zlwith H " zlrepresent the height H of round platform rectification section 3 respectively zlheight after increasing and reducing; Round platform rectification section height H zladjustment amount be not more than 0.15D;
3. the length L of described bell-shaped suction box straight entry section 1 is 1. determined according to step jkfor 3.07D, lengthen on step basis 2. according to the needs that pumping plant superstructure is arranged or shorten L jk, the length L of the described middle dividing pier 4 of corresponding adjustment simultaneously g, adjustment L jkand L gtime tunnel inlets height H 1remain unchanged; Adjustment L jkand L gmode as shown in Figure 4, in figure, L ' jkwith L ' grepresent the length of the import straightway 1 after the lengthening of import straightway 1 and dividing pier 4 respectively, L " jkwith L " grepresent the length of the import straightway 1 after the shortening of import straightway 1 and dividing pier 4 respectively;
4. 1. determine that the base angle of inclination beta of described bell-shaped suction box straight entry section 1 is 5 ° according to step, the needs be connected with Forebay of Pumping Station according to the bell section of turning to 2 strengthen or reduce β on step basis 3., its adjustment amount is not more than 5 °, and during adjustment β, the height of this section of each section remains unchanged; The mode of adjustment β as shown in Figure 5, in figure, β ' and β " represent respectively import straightway 1 base angle of inclination beta increase and after reducing angle;
5. according to the geometric parameter of the described bell-shaped suction box converted and after adjustment, in AUTO CAD software, required bell-shaped suction box single line drawing is drawn;
The adjustment of above-mentioned round platform rectification section 3 and straight entry section 1 geometric parameter does not all change the geometrical body of the bell section of turning to 2.

Claims (10)

1. a bell-shaped suction box, is characterized in that, described bell-shaped suction box comprises the straight entry section arranged along water (flow) direction, the bell section of turning to and round platform rectification section, arranges water guide round platform in the bell section of turning to; Described straight entry section is positioned at described bell-shaped suction box foremost, and in described straight entry section, middle part is provided with middle dividing pier along water (flow) direction;
Each physical dimension of described bell-shaped suction box represents with relative value, and with water pump vane diameter D for reference value, the length L of bell-shaped suction box is 4.1D, entrance width B 1for 2.85D, height H are 1.4D;
The effect of described straight entry section is the needs of adaptation pump house superstructure layout and guides current to enter runner from Forebay of Pumping Station, and upper and lower sideline and the plane shape line of straight entry section are straight line, and section configuration is rectangle, its length L jkfor 3.07D, entrance width B 1for 2.85D, inlet height H 1for 1.52D, base angle of inclination beta are 5 °, import top board radius of arc R=0.25D+0.2m; The length L of described middle dividing pier gfor 2.5D, thickness B g=0.174D+0.191m, head radius of arc R g1=0.48D, afterbody radius of arc R g2=2.86D; The flow channels of straight entry section is made up of runner inner wall and middle dividing pier outer wall;
After the described bell section of turning to is positioned at straight entry section, the bell section of turning to guides current to do 90 ° in an orderly manner and turns to and accelerate; That to be bell, bottom be is flat for the shaped upper part of the bell section of turning to, plane shape is scroll casing shape, bellly turns to segment length L zxfor 1.89D, height H zxfor 0.97D, entrance width B 2for 2.85D, inlet height H 2for 0.91D; The base diameter D of described water guide round platform dfor 1.32D, upper diameter D sfor 1.1D l, height H zxfor 0.97D, D lfor the diameter of water pump vane hub body blade wheel chamber admission section; The flow channels of the bell section of turning to is made up of runner inner wall and water guide round platform outer wall;
After described round platform rectification section is positioned at the bell section of turning to, the flow channels of round platform rectification section is made up of runner inner wall and round platform outer wall, the effect of round platform rectification section does last adjustment and acceleration to the current flowing to water pump vane room, to enter blade wheel chamber with ensureing uniform fluid flow; The shape of generatrix of its runner inner wall, round platform outer wall is straight line, round platform rectification section height H zlthe inner diameter D of=0.1065D+0.4367m, outlet n2for 0.88D, outer diameter D w2for D l, round platform rectification section import inner diameter D n1for 0.94D, import outer diameter are D w1, D w1with the upper diameter D of described water guide round platform sequal.
2. bell-shaped suction box according to claim 1, is characterized in that, the described bell section of turning to comprises bell curved surface, plane spiral case curved surface, water guide round platform curved surface.
3. bell-shaped suction box according to claim 2, is characterized in that, the bell-shaped curve of described bell curved surface adopts bell-shaped curve data representation, and bell-shaped curve data sheet comprises coordinate points numbering, angle [alpha] ziand radius R zi.
4. bell-shaped suction box according to claim 2, is characterized in that, the plane spiral case curve of described plane spiral case curved surface adopts plane spiral case curve data to represent, plane spiral case curve data table comprises coordinate points numbering, angle [alpha] wiand radius R wi.
5. bell-shaped suction box according to claim 2, is characterized in that, the water guide round platform curve of described water guide round platform curved surface adopts water guide round platform curve data to represent, water guide round platform curve data table comprises coordinate points numbering, angle [alpha] diand radius R di.
6. an application process for bell-shaped suction box, is characterized in that, comprises the following steps:
(1) bell-shaped suction box is provided with straight entry section, the bell section of turning to and round platform rectification section 3 sections successively along water (flow) direction, and the relative value that all to adopt with water pump vane diameter D by the physical dimension of each section be reference value represents; Described straight entry section is positioned at described bell-shaped suction box foremost, and in straight entry section, middle part is provided with middle dividing pier along water (flow) direction, and the upper and lower sideline of runner and plane shape line are straight line, and section configuration is rectangle, its length L jkfor 3.07D, entrance width B 1for 2.85D, inlet height H 1for 1.52D, base angle of inclination beta are 5 °, import top board radius of arc R=0.25D+0.2m, the length L of described middle dividing pier gfor 2.5D, thickness B g=0.174D+0.191m, head radius of arc R g1=0.48D, afterbody radius of arc R g2=2.86D, straight entry section flow channels is made up of runner inner wall and middle dividing pier outer wall, and the effect of straight entry section is the needs of adaptation pump house superstructure layout and guides current to enter runner from Forebay of Pumping Station;
After the described bell section of turning to is positioned at straight entry section, that to be bell, bottom be the bell section of turning to shaped upper part is flat, plane shape is scroll casing shape, and the bell intersegmental part that turns to is provided with water guide round platform, bellly turns to segment length L zxfor 1.89D, height H zxfor 0.97D, entrance width B 2for 2.85D, inlet height H 2for 0.91D, the base diameter D of described water guide round platform dfor 1.32D, upper diameter D sfor 1.1D l, height H zxfor 0.97D, D lfor the diameter of water pump vane hub body blade wheel chamber admission section; The bell section of turning to flow channels is made up of runner inner wall and water guide round platform outer wall, and the bell section of turning to guides current to do 90 ° in an orderly manner and turns to and accelerate;
After described round platform rectification section is positioned at the bell section of turning to, flow channels is made up of runner inner wall and round platform outer wall, and the shape of generatrix of its inside and outside wall is straight line, its height H zlthe inner diameter D of=0.1065D+0.4367m, outlet n2with outer diameter D w2be respectively 0.88D and D l, its import inner diameter D n1for 0.94D, import outer diameter are D w1with the upper diameter D of water guide round platform sequal, the effect of this section does last adjustment and acceleration to the current flowing to water pump vane room, to enter blade wheel chamber with ensureing uniform fluid flow;
(2) the straight entry section utilizing step (1) to determine, the bell section of turning to and round platform rectification section geometric parameter, calculate the actual required size of this pumping plant water inlet flow channel according to the water pump vane diameter D that pumping plant is intended adopting;
(3) height H of round platform rectification section is determined according to step (2) zl, the actual demand according to pumping plant strengthens or reduces H on the basis of step (2) zl, adjustment H zltime, the inner diameter D of this section of import n1with outer diameter D w1, outlet inner diameter D n2with outer diameter D w2all remain unchanged;
(4) the length L of straight entry section is determined according to step (2) jk, lengthen on the basis of step (3) according to the needs that pumping plant superstructure is arranged or shorten L jk, at adjustment L jkwhile the length L of the described middle dividing pier of corresponding adjustment g, adjustment L jkand L gtime, tunnel inlets height H 1remain unchanged;
(5) determine the base angle of inclination beta of straight entry section according to step (2), strengthen according to the needs that this section is connected with Forebay of Pumping Station or reduce β on the basis of step (4), during adjustment β, the height of this section of each section remains unchanged;
(6) according to the geometric parameter of the described bell-shaped suction box converted and after adjustment, in mapping software, required bell-shaped suction box single line drawing is drawn;
According to step (3), (4), (5) to round platform rectification section H zlwith straight entry section L jk, L g, β is when adjusting, and do not change the geometric parameter of the determined bell section of turning to of step (2).
7. the application process of bell-shaped suction box according to claim 6, is characterized in that, the described bell section of turning to comprises bell curved surface, plane spiral case curved surface, water guide round platform curved surface.
8. the application process of bell-shaped suction box according to claim 7, is characterized in that, the bell-shaped curve of described bell curved surface adopts bell-shaped curve data representation, and bell-shaped curve data sheet comprises coordinate points numbering, angle [alpha] ziand radius R zi.
9. the application process of bell-shaped suction box according to claim 7, is characterized in that, the plane spiral case curve of described bell curved surface adopts plane spiral case curve data to represent, plane spiral case curve data table comprises coordinate points numbering, angle [alpha] wiand radius R wi.
10. the application process of bell-shaped suction box according to claim 7, is characterized in that, the water guide round platform curve of described water guide round platform curved surface adopts water guide round platform curve data to represent, water guide round platform curve data table comprises coordinate points numbering, angle [alpha] diand radius R di.
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