CN109469155A - A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line - Google Patents

A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line Download PDF

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Publication number
CN109469155A
CN109469155A CN201811371844.1A CN201811371844A CN109469155A CN 109469155 A CN109469155 A CN 109469155A CN 201811371844 A CN201811371844 A CN 201811371844A CN 109469155 A CN109469155 A CN 109469155A
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circular arc
arc line
whirlpool
water inlet
variable diameter
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CN109469155B (en
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杨帆
高慧
刘超
刘传洲
胡文竹
钱军
陈洁茹
张海军
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Yangzhou University
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Yangzhou University
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    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03BINSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00Use of pumping plants or installations; Layouts thereof
    • EFIXED CONSTRUCTIONS
    • E03WATER SUPPLY; SEWERAGE
    • E03FSEWERS; CESSPOOLS
    • E03F5/00Sewerage structures
    • E03F5/22Adaptations of pumping plants for lifting sewage

Abstract

The invention discloses a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, belongs to pump station engineering technical field.With hanging a height of constraint condition of the width dimensions of water inlet structure and oviduct, number of diameter changing is determinednNumerical value,Equal difference variable diameter circular arc line is depicted as plane curve, is made of reinforcing bar by plane curve, brushing antirust paint after production.Again according to the hanging high tensile elongation for determining equal difference variable diameter circular arc line of oviduct, plane curve is drawn into control whirlpool device, interval reinforcing is carried out using helix of the steel bar rod welding technique to control whirlpool device, after the completion of reinforcing, control whirlpool device is integrally placed in the cylinder shape groove of water inlet structure bottom plate, using plain concrete packing, ensure that packing rear top surface is identical as the elevation of top surface of water inlet structure and flatness, increase the overall stability of control whirlpool device with this, it avoids being chronically in water because of foundation bolt and operating unit vibrates and causes to control the case where whirlpool device integrally loosens loosely appearance.

Description

A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line
Technical field
The present invention relates to the water inlet structure of a kind of moist chamber type pump house and block fundamental mode pump house, especially box culvert-type water inlet flow channel and Open type intake pool, specifically a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, belongs to pump station engineering technology Field.
Background technique
Middle-size and small-size filling row's pumping plant frequently with moist chamber type pump house, the water inlet structure of the pump house mostly use box culvert-type water inlet structure or Open type intake pool, the water inlet structure are the structures that water supply pump oviduct and suction hose directly absorb water.For axial-flow pump and lead Leaf formula mixed-flow pump, oviduct and suction hose are the changeover portion between water inlet structure and blade wheel chamber's import, oviduct and suction hose Internal flow state is necessarily influenced by water inlet structure internal flow state.The main function of water inlet structure is to provide for unit fixed on water pump suction well Flow condition.If flow velocity is unevenly distributed inside water inlet structure, or even there are also vortex rope to generate, then will necessarily significantly reduce water pump Energy characteristics and cavitation performance, but also easily lead to pumping plant unit generate vibration, can not normal safe and stable operation.It is existing wet Room type pump house water inlet structure bottom often generates attached bottom whirlpool, and the generation in attached bottom whirlpool is often just at loudspeaker nozzle face water inlet structure bottom The periphery in plate region just enters inside water pump with water flow once generating, the security reliability of water pump is influenced, at present in various loudspeaker There may be attached bottom whirlpools in the case of pipe flying height.
Existing pumping plant is to obtain good flow condition, and diversion pier, deflector, deflection cone are often arranged in water inlet structure It is solid construction with counteracting vortex, these counteracting vortex such as the vortex lattice that disappears, consumptive material is more, and cast in situs needs shuttering, processing and manufacturing It is inconvenient.To solve this problem, (publication No. is 107938758 A of CN to Chinese invention patent, and the day for announcing is April 20 in 2018 Day) a kind of control whirlpool device based on fermat spiral is provided, which is that cored screw structure has well solved the whirlpool that disappears Problem more than device consumptive material, because the structure be cored screw structure easily exist reinforcing bar select it is improper caused by overall structure stablize Property it is poor, and the connection for controlling whirlpool device and intake pool bottom plate need to expend more foundation bolt, long-term unit runs and be immersed in water In easily lead to foundation bolt and loosen to cause that control whirlpool apparatus structure is unstable, and entire whirlpool apparatus structure shakiness of controlling will lead to control whirlpool There is inclination, outwells in device, and device control whirlpool function is caused to be lost, and control whirlpool device cannot play control whirlpool and make during pumping station operation With, cause unit operation stability to be affected, increase unit operation risk factor.Secondly, the control based on fermat spiral Then the drafting that whirlpool device processing and fabricating need to carry out in the plane curve using polar coordinates carries out processing and fabricating, apply in practical operation Worker person often temporarily to employ personnel often unclear to polar definition and understanding, needs professional technician aside to refer to It leads, otherwise easily leads to control whirlpool device processing and deviation occur, if control whirlpool device processing goes wrong, will lead to the control whirlpool of control device The performance of function reduces.Fermat spiral is equiangular spiral, using central point is that origin is needed by clockwise and the inverse time when drafting Needle direction draw, draw workload compared to equal difference variable diameter circular arc line workload mostly by about one time, workload increase and it is cumbersome.
Through analyzing, there is skill upgrading and improved space in existing vortex reducing means.It intakes and ties for small and medium-sized pumping station Existing solid vortex reducing means consumptive material that structure faces is more and the technical problem of existing hollow vortex reducing means structural stability difference, designs one Kind can inhibit attached bottom whirlpool generation and consumptive material is few, and good its meaning of control whirlpool device of structural stability and application value are very Greatly, it can not only solve the problems, such as the actual whirlpool that disappears of pump station engineering, improve flow condition, can also reduce processing and manufacturing cost, increase disappears The durability and reliability of whirlpool device, and the control whirlpool device can also be used to the industrial pumping plant for facing same problem.
Summary of the invention
To solve the common problem that above-mentioned small and medium-sized pumping station water inlet structure faces, the present invention devises a kind of based on equal difference change The water inlet structure control whirlpool device of diameter circular arc line, the invention design method is simple, convenient processing and manufacture, saves material, convenient for practical The popularization and application of engineering.
Technical scheme is as follows:
A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, characterized in that the control whirlpool device is located at water inlet Below oviduct in structure, the oviduct is connected to below suction hose;The control whirlpool device is made according to the following steps:
(1) using loudspeaker nozzle diameter D as constraint condition, total screw pitch L of equal difference variable diameter circular arc line should meet 1.25D≤L≤ 1.5D, total screw pitch L answer round numbers, and the variable diameter value of radius is m, the calculating formula of the variable diameter value m of radius are as follows:
M=L/n;
In formula: L is total screw pitch of equal difference variable diameter circular arc line, and n is number of diameter changing;
(2) according to the width L of water inlet structure1With the size of loudspeaker nozzle diameter D, rationally determine that number of diameter changing n's is specific Numerical value, n take 3-8;According to the number of diameter changing determined, circular arc line angle theta corresponding to equal difference increasing radius is 360 °/n;
(3) using loudspeaker nozzle central point water inlet structure bottom plate subpoint as plane coordinates center origin, stream side downstream To X-direction is defined as, Transverse to the flow direction is defined as Y-direction, defines plane coordinate system XOY with this;With the original of plane coordinates XOY Point is starting point, and using variable diameter value m as radius, central angle θ draws first segment circular arc along clockwise direction, can get first segment circle The terminal point coordinate (0,2mtan0.5 θ) of arc;
Again with the terminal point coordinate of first segment circular arc (0,2mtan0.5 θ) for starting point, equal difference variable diameter value 2m is radius, central angle For θ, second segment circular arc line is drawn along clockwise direction, can get the terminal of second segment circular arc;Again with the terminal of second segment circular arc As starting point, using equal difference variable diameter value 3m as radius, central angle θ draws third section circular arc line along clockwise direction;And so on Successively draw nth circular arc line;The circular arc line being sequentially connected constitutes equal difference variable diameter circular arc line, as controls the Plane Curved of whirlpool device Line;
(4) according to the hanging high L of oviduct2Determine the stretching height L of equal difference variable diameter circular arc line3Are as follows:
L3=(0.40-0.50) L2
Top is the start position of equal difference variable diameter circular arc line when equal difference variable diameter circular arc line vertical three-dimensional stretches;
(5) use reinforcing bar by processing and fabricating is carried out in proportion the plane curve in step (3), in rebar surface after production Brushing antirust paint, then by L in step (4)3Stretching height carry out stretched vertically arrangement;And the control whirlpool device after stretching is embedded It is located on same plumb line in the center and pump shaft line on the bottom plate of water inlet structure, making control whirlpool device.
Further, interval spiral is carried out to the control whirlpool device after stretching in step (5) using steel bar rod welding technique The reinforcement of weld of line is counted from the top of control whirlpool device, is welded between the 1st circle circular arc line and the 2nd circle circular arc line using steel bar rod It is fixed, then do not reinforced then between the 2nd circle circular arc line and the 3rd circle circular arc line, the 3rd circle and the 4th circle circular arc line use again steel bar rod into Row reinforcement of weld, and so on.
Further, on the bottom plate of water inlet structure, it is with subpoint of the oviduct central point on water inlet structure bottom plate The center of circle makes the cylinder shape groove that depth is (1.0-1.5) m using half, that is, 0.5L of total screw pitch as radius;
Control whirlpool device is integrally placed in cylinder shape groove, and the center of control whirlpool device and pump shaft line are located at same lead On vertical line, the circular arc line for being located at intake pool plate top surface control whirlpool device below is poured using plain concrete, so that control Whirlpool device can securely connect with the bottom plate of water inlet structure.
Beneficial effects of the present invention are as follows:
It is arranged on the water inlet structure bottom plate of moist chamber type pump house or block fundamental mode pump house a kind of based on equal difference variable diameter circular arc line Water inlet structure control whirlpool device can effectively destroy the energy concentration in attached bottom whirlpool, the root that attached bottom whirlpool generates be eliminated from source, if there is whirlpool Band destroys the continuity of vortex rope, achievees the purpose that eliminate vortex rope, be somebody's turn to do by easily being cut off by helix (circular arc line) when control whirlpool device Control whirlpool device can provide preferably inflow condition for water pump, it is ensured that the safe and stable operation of water pump.Equal difference variable diameter circular arc line is drawn System is to avoid the workload that the very complicated of fermat spiral is drawn based on polar coordinate system, practical operation based on rectangular coordinate system Middle construction personnel is often temporarily to employ personnel often unclear to polar definition and understanding, and professional and technical personnel in the field is needed to exist Side is instructed, and otherwise easily leads to control whirlpool device processing and deviation occurs, if control whirlpool device processing goes wrong, will lead to control The performance of the control whirlpool function of device reduces;It using central point is origin needs when drafting secondly, fermat spiral is equiangular spiral By drawing clockwise and counterclockwise, drafting workload compares the workload of equal difference variable diameter circular arc line mostly by about one time, workload It is more and more cumbersome.It is long to avoid foundation bolt together with the bottom slab concreting of water inlet structure for the bottom structure of the control whirlpool device Phase is in water get rusty etc. caused by loosening problem, while using steel bar rod welding technique and more ensuring total The structure of stability, the invention patent is more stable.A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, processing It is easy to make, material is saved, promotion and implementation are convenient for.
Currently, at the fixed pumping plant 44.3 ten thousand of national electromechanical irrigation, 23,950,000 kilowatts of total installed capacity power, wherein large size fills 4,020,000 kilowatts of pumping plant total installed capacity power is irrigate, medium and small electromechanical irrigation pumping plant total installed capacity power is just 19,930,000 kilowatts, and middle or small The most common water inlet structure of type pumping plant is box culvert-type water inlet flow channel or open type intake pool, and 90% is built in 20 generation in these pumping plants Discipline 60, the seventies, limit engineering specification and technical level at that time, either large or small problem occur in many small and medium-sized pumping stations.Country is Renovating for Large Or Medium Type Irrigation Areas and construction of water conservancy works project is carried out, these are conducive to the present invention in moist chamber type pumping plant It renovates middle application, and is applied in the construction of new pumping plant, vortex rope can be eliminated, it is ensured that pumping plant economy, stabilization and safety fortune Row.A kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line of the invention not only has the function of pressing down whirlpool, can also break The integrality of bad existing vortex rope, achievees the purpose that the whirlpool that disappears, improves the import flow condition of water pump, improve water pump safety and stability Stability then reduces the consumption of the energy, and the reduction bring economic benefit of this energy consumption, social influence all will be very Greatly.
Detailed description of the invention
Fig. 1 is schematic three dimensional views of the invention;
Fig. 2 is two views of the invention;
Fig. 3 is top view of the invention;
Fig. 4 is control whirlpool device schematic three dimensional views of the invention;
In figure: 1 suction hose, 2 water inlet structures, 3 oviducts, 4 control whirlpool devices, 5 water inlet structure bottom plates.
Specific embodiment
Below in conjunction with drawings and examples, the present invention is further elaborated.
As shown in Figure 1, a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, with the broad-ruler of water inlet structure Very little and oviduct hanging a height of constraint condition, determines the numerical value of number of diameter changing n, equal difference variable diameter circular arc line is depicted as Plane Curved Line is made of reinforcing bar by plane curve, brushing antirust paint after production.Again according to the hanging high determining equal difference variable diameter of oviduct Plane curve is drawn into control whirlpool device using Simple mechanical stretcher, is welded using steel bar rod by the tensile elongation of circular arc line Connection technology carries out interval reinforcing to the helix of control whirlpool device, and after the completion of reinforcing, control whirlpool device is integrally placed at water inlet structure bottom In the cylinder shape groove of plate, using plain concrete packing, it is ensured that the elevation of top surface and flatness of packing rear top surface and water inlet structure It is identical, increase the overall stability of control whirlpool device with this, avoids due to foundation bolt is chronically in water with operating unit vibration Cause to control the case where whirlpool device integrally loosens loosely appearance.Specific manufacturing step is as follows:
(1) using loudspeaker nozzle diameter D as constraint condition, comprehensively consider the mounting condition of control whirlpool device, equal difference variable diameter circular arc Total screw pitch L of line should meet 1.25D≤L≤1.5D, and total screw pitch L answers round numbers, and the variable diameter value of radius is m, the variable diameter value m of radius Calculating formula are as follows:
M=L/n;
In formula: L is total screw pitch of equal difference variable diameter circular arc line;N is number of diameter changing.
(2) according to the width L of water inlet structure1With the size of loudspeaker nozzle diameter D, rationally determine that number of diameter changing n's is specific Numerical value, n take 3-8, and according to Code for design of pumping cstations, if pumping plant is small pumping station, number of diameter changing n takes limit value on the lower side;During if pumping plant is Type pumping plant, number of diameter changing n take limit value on the upper side.According to the number of diameter changing determined, circular arc line angle theta corresponding to equal difference increasing radius For 360 °/n.
(3) using loudspeaker nozzle central point water inlet structure bottom plate subpoint as plane coordinates center origin, stream side downstream To X-direction is defined as, Transverse to the flow direction is defined as Y-direction, defines plane coordinate system XOY with this.With the original of plane coordinates XOY Point is starting point, and using variable diameter value m as radius, central angle θ draws first segment circular arc along clockwise direction, can get first segment circle The terminal point coordinate (0,2mtan0.5 θ) of arc;
Again with the terminal point coordinate of first segment circular arc (0,2mtan0.5 θ) for starting point, equal difference variable diameter value 2m is radius, central angle For θ, second segment circular arc line is drawn along clockwise direction, by the terminal that can get second segment circular arc;Again with the end of second segment circular arc Point is used as starting point, and using equal difference variable diameter value 3m as radius, central angle θ draws third section circular arc line along clockwise direction;With such Push away successively drafting nth circular arc line.The circular arc line being sequentially connected constitutes equal difference variable diameter circular arc line, as controls the plane of whirlpool device Curve.
(4) according to the hanging high L of oviduct2Determine the stretching height L of equal difference variable diameter circular arc line3Are as follows:
L3=(0.40-0.50) L2
Top is the start position coordinate (0,0) of equal difference variable diameter circular arc line when equal difference variable diameter circular arc line vertical three-dimensional stretches.
(5) use reinforcing bar by processing and fabricating is carried out in proportion the plane curve in step (3), in rebar surface after production Brushing antirust paint, then press L3Stretching height carry out stretched vertically arrangement.
(6) welding of interval helix is carried out to the control whirlpool device stretched in step (5) using steel bar rod welding technique Reinforce, such as: count from the top of control whirlpool device (from oviduct to runner bottom plate direction number), the 1st circle helix (circular arc line) and It is welded and fixed between 2nd circle helix (circular arc line) using steel bar rod, then the 2nd circle helix (circular arc line) and the 3rd circle helix It is not reinforced then between (circular arc line), the 3rd circle and the 4th circle helix (circular arc line) carry out reinforcement of weld using steel bar rod again, with this Analogize.
(7) on the bottom plate of water inlet structure, using subpoint of the oviduct central point on water inlet structure bottom plate as the center of circle, with Half, that is, 0.5L of total screw pitch is radius, the cylinder shape groove that production depth is (1.0-1.5) m, the size and control whirlpool dress of depth The structure size set is directly proportional.
(8) whirlpool device will be controlled integrally to be placed in the cylinder shape groove in step (7) on setting water inlet structure bottom plate, and controlled The center of whirlpool device and pump shaft line are located on same plumb line, to the spiral shell for being located at intake pool plate top surface control whirlpool device below Spin line is poured using plain concrete, so that control whirlpool device can securely connect with bottom plate, the plain concrete top surface after pouring is needed It keeps and the elevation of intake pool plate top surface is identical as flatness, the scene such as no protrusion occurs, and increases the entirety of control whirlpool device Stability.

Claims (3)

1. a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line, characterized in that the control whirlpool device is located at water inlet knot Below oviduct in structure, the oviduct is connected to below suction hose;The control whirlpool device is made according to the following steps:
(1) using loudspeaker nozzle diameter D as constraint condition, total screw pitch L of equal difference variable diameter circular arc line should meet 1.25D≤L≤1.5D, Total screw pitch L answers round numbers, and the variable diameter value of radius is m, the calculating formula of the variable diameter value m of radius are as follows:
M=L/n;
In formula: L is total screw pitch of equal difference variable diameter circular arc line, and n is number of diameter changing;
(2) according to the width L of water inlet structure1With the size of loudspeaker nozzle diameter D, the specific value of number of diameter changing n, n are rationally determined Take 3-8;According to the number of diameter changing determined, circular arc line angle theta corresponding to equal difference increasing radius is 360 °/n;
(3) using loudspeaker nozzle central point water inlet structure bottom plate subpoint as plane coordinates center origin, Parallel to the flow direction is fixed Justice is X-direction, and Transverse to the flow direction is defined as Y-direction, defines plane coordinate system XOY with this;Origin with plane coordinates XOY is Starting point, using variable diameter value m as radius, central angle θ draws first segment circular arc along clockwise direction, can get first segment circular arc Terminal point coordinate (0,2mtan0.5 θ);
Again with the terminal point coordinate of first segment circular arc (0,2mtan0.5 θ) be starting point, equal difference variable diameter value 2m be radius, central angle θ, Second segment circular arc line is drawn along clockwise direction, can get the terminal of second segment circular arc;Again using the terminal of second segment circular arc as Starting point, using equal difference variable diameter value 3m as radius, central angle θ draws third section circular arc line along clockwise direction;And so on successively Draw nth circular arc line;The circular arc line being sequentially connected constitutes equal difference variable diameter circular arc line, as controls the plane curve of whirlpool device;
(4) according to the hanging high L of oviduct2Determine the stretching height L of equal difference variable diameter circular arc line3Are as follows:
L3=(0.40-0.50) L2
Top is the start position of equal difference variable diameter circular arc line when equal difference variable diameter circular arc line vertical three-dimensional stretches;
(5) use reinforcing bar by processing and fabricating is carried out in proportion the plane curve in step (3), in rebar surface brushing after production Antirust paint, then by L in step (4)3Stretching height carry out stretched vertically arrangement;And by the control whirlpool device after stretching be embedded in into On the bottom plate of water-bound, it is located at the center for controlling whirlpool device and pump shaft line on same plumb line.
2. a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line according to claim 1, characterized in that adopt The reinforcement of weld for carrying out interval helix to the control whirlpool device after stretching in step (5) with steel bar rod welding technique, from control whirlpool The top of device is counted, the 1st circle circular arc line and the 2nd circle circular arc line between be welded and fixed using steel bar rod, then the 2nd circle circular arc line and It is not reinforced then between 3rd circle circular arc line, the 3rd circle and the 4th circle circular arc line use steel bar rod to carry out reinforcement of weld again, and so on.
3. a kind of water inlet structure control whirlpool device based on equal difference variable diameter circular arc line according to claim 1, characterized in that On the bottom plate of water inlet structure, using subpoint of the oviduct central point on water inlet structure bottom plate as the center of circle, with the half of total screw pitch That is 0.5L is radius, the cylinder shape groove that production depth is (1.0-1.5) m;
Control whirlpool device is integrally placed in cylinder shape groove, and the center of control whirlpool device and pump shaft line are located at same plumb line On, the circular arc line for being located at intake pool plate top surface control whirlpool device below is poured using plain concrete, so that control whirlpool dress Setting can securely connect with the bottom plate of water inlet structure.
CN201811371844.1A 2018-11-15 2018-11-15 Water inlet structure vortex control device based on equal-difference reducing arc line Active CN109469155B (en)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000303549A (en) * 1999-04-20 2000-10-31 Hitachi Ltd Suction passage for pump
JP2002089479A (en) * 2000-09-08 2002-03-27 Hitachi Ltd Suction water tank for vertical shaft pump
CN104818699A (en) * 2015-04-01 2015-08-05 扬州大学 1/4 elliptic cone conical table eddy eliminating device and method for closed intake pool
CN104895145A (en) * 2015-06-15 2015-09-09 扬州大学 Dustpan-shaped inflow channel with excellent hydraulic performance and application method of dustpan-shaped inflow channel
CN206174043U (en) * 2016-10-27 2017-05-17 扬州大学 Middle -size and small -size box culvert formula water intake structure for pump station
CN106759667A (en) * 2016-11-18 2017-05-31 武汉大学 Packaged type pumping plant intake pool vortex reducing means
CN107938758A (en) * 2017-11-29 2018-04-20 扬州大学 A kind of water inlet structure control whirlpool device based on fermat spiral

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000303549A (en) * 1999-04-20 2000-10-31 Hitachi Ltd Suction passage for pump
JP2002089479A (en) * 2000-09-08 2002-03-27 Hitachi Ltd Suction water tank for vertical shaft pump
CN104818699A (en) * 2015-04-01 2015-08-05 扬州大学 1/4 elliptic cone conical table eddy eliminating device and method for closed intake pool
CN104895145A (en) * 2015-06-15 2015-09-09 扬州大学 Dustpan-shaped inflow channel with excellent hydraulic performance and application method of dustpan-shaped inflow channel
CN206174043U (en) * 2016-10-27 2017-05-17 扬州大学 Middle -size and small -size box culvert formula water intake structure for pump station
CN106759667A (en) * 2016-11-18 2017-05-31 武汉大学 Packaged type pumping plant intake pool vortex reducing means
CN107938758A (en) * 2017-11-29 2018-04-20 扬州大学 A kind of water inlet structure control whirlpool device based on fermat spiral

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