CN206862427U - A kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter - Google Patents
A kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter Download PDFInfo
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- CN206862427U CN206862427U CN201720520484.1U CN201720520484U CN206862427U CN 206862427 U CN206862427 U CN 206862427U CN 201720520484 U CN201720520484 U CN 201720520484U CN 206862427 U CN206862427 U CN 206862427U
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Abstract
A kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter.Including supervisor and shunt pipe, water meter is installed on horizontal branch pipe, the flow of field dewatering outlet door is multiplied by the multiplication factor of demarcation for the meter reading of shunt pipe.Main pipeline is formed by straight length, reducer and tailpipe section are end to end successively, according to the ratio between the caliber of the tailpipe section and straight length of channel ordinary water level and elevation difference of field surface scientific design main pipeline, it is water inlet in the port insertion final stage channel of straight length, irrigation water enters supervisor by the miniature trash rack for metastomium of intaking and miniature gate diversion, 45 ° of elbows are connected in tailpipe section end, delivery port section is 0~30 ° with horizontal plane angle.Branch pipe is shunted using the differential pressure of Pitot tube differential pressure+Venturi tube, increases flowing pressure and flow, while measure using the Waterwheel-type water meter (or ultrasonic wave) of anti-clogging.The utility model is applied widely, and measurement accuracy is high, can ensure that full packages goes out stream, make current more unobstructed.
Description
Technical field
The utility model category field irrigation metering field, it is related to a kind of metering device of canal irrigation water, it is especially a kind of
Canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter.
Background technology
In order to solve the problems, such as the field water metering of canal irrigation area, it can meet that metering is realized in most final stage field dewatering outlet
Control needs, and fundamentally realizes and is preceding devising one by the management needs of " metering pack piece " to " being metered into family ", the applicant
Kind canal irrigation field dewatering outlet door Pitot tube shunting water meter, including supervisor and shunt pipe, a port insertion end of supervisor
It is water inlet in level channel, its other end is the upward main pipe elbow delivery port in right angle, and side is being responsible in shunt pipe design,
It is made up of the pressure-measuring pipe of right angle Pitot tube, horizontal branch pipe, water meter and vertical flow velocity direction, right angle Pitot tube is responsible for installed in flow
Near average rate point position, face supervisor's flow velocity direction, the horizontal segment of right angle Pitot tube is positioned at the inside of supervisor and apart from inwall
Fixed at 0.125D, D is the nominal diameter of supervisor, and the vertical section external port of right angle Pitot tube passes through elbow bend, horizontal branch pipe
Connected with the external port of pressure-measuring pipe, Waterwheel-type water meter is housed on horizontal branch pipe.
Due to a kind of above-mentioned canal irrigation field dewatering outlet door Pitot tube shunting water meter, its supervisor is with uniform diameters
Straight-tube shape, have the drawback that channel ordinary water level and elevation difference of field surface it is smaller when (be less than 20cm), only by less Pitot tube
Differential pressure, smaller by the flow of shunt pipe, the ratio of field dewatering outlet door flow and meter reading is high, is easily caused measuring accuracy
It is not high；Also, it is responsible for delivery port using the upward elbow in right angle, increases out flowing water position and resistance to water-flow, is unfavorable for current and leads to
Freely.Water meter is the core component of measurement, it is necessary to which more preferable working environment protection, to ensure its accuracy, is often used at present simultaneously
Water meter pool is protected, but existing water meter pool volume is big, and constructional difficulties are big, and cost is high.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, it is poor that the utility model provides a kind of canal irrigation field dewatering outlet door Pitot tube
Pressure shunting Venturi tube water meter, the scope of application is wider, and measurement accuracy is higher, can ensure that full packages goes out stream, reduce resistance to water-flow,
Make current more unobstructed.
The utility model solves the technical scheme that its technical problem uses：Including supervisor and shunt pipe, propped up in level
Water meter is installed, the supervisor is formed by straight length, reducer and tailpipe section are end to end successively, and the port of straight length is inserted on pipe
It is water inlet to enter in final stage channel, and irrigation water enters supervisor by the miniature trash rack for metastomium of intaking and miniature gate diversion,
The joint being connected with the tailpipe section end of supervisor is 45 ° of elbows, and the delivery port section peak of 45 ° of elbows is in vertical direction
Concordant with the tailpipe section top of supervisor, delivery port section is 0~30 ° with horizontal plane angle.
Compared with prior art, a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube amount of the present utility model
Water meter, it is reducer pipe by the straight tube pipe for changing supervisor, i.e., is formed by straight length, reducer and tailpipe section are end to end successively,
It is in order to solve (to be less than 20cm) when channel ordinary water level and elevation difference of field surface are smaller, only by less Pitot tube differential pressure, by dividing
The flow of stream branch pipe is smaller, and the ratio of field dewatering outlet door flow and meter reading is high, is easily caused the problem of measuring accuracy is not high；
The joint being connected with the tailpipe section end of supervisor is 45 ° of elbows, and the delivery port section peak of 45 ° of elbows is in vertical direction
Concordant with the tailpipe section top of supervisor, delivery port section is 0~30 ° with horizontal plane angle, ensure that full packages goes out stream, reduces current
Resistance, make current more unobstructed.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the utility model one embodiment.
Fig. 2 is the structural representation of miniature gate in the utility model one embodiment.
Fig. 3 is the structural representation of miniature trash rack in the utility model one embodiment.
Fig. 4 is the schematic enlarged-scale view at totally-enclosed special miniature meter box in the utility model one embodiment.
In figure, 1, vertical notch, 2, straight length, 3, shunt pipe, 4, water meter, 5, reducer, 6, tailpipe section, 7,45 ° are curved
Head, the arc section of 8,45 ° of elbows, 9, delivery port section, 10, lifting gate grip hole, 11, miniature gate, 12, miniature block dirt
Grid, 12-1, ￠ 4mm reinforcing bar, 12-2, ￠ 4mm reinforcing bar, 13, the square plate of miniature trash rack, 14, totally-enclosed special micro-
Type meter box, 15, case lid, 16, filler.
Embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, the technical scheme in the embodiment of the utility model is clearly and completely described, it is clear that is retouched
The embodiment stated is part of the embodiment of the present utility model, rather than whole embodiments.Based on the reality in the utility model
Example is applied, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, is all belonged to
In the scope of protection of the utility model.
Fig. 1 shows a preferred embodiment of the present utility model, a kind of canal irrigation field dewatering outlet door Pitot in figure
Pipe differential pressure shunt Venturi tube water meter, including supervisor and shunt pipe 3, supervisor a port insertion final stage channel in be into
The mouth of a river, for irrigation water by water inlet diversion to being responsible for, its another end is delivery port, and water meter 4 is provided with horizontal branch pipe.
The flow (i.e. field dewatering outlet door) of supervisor passes through testing equipment Accurate Calibration with the reading of water meter 4 on shunt pipe 3, it is determined that point
The reading of water meter 4 and field dewatering outlet door flow of inlet water multiple proportion on branch pipe 3 are flowed, mark is multiplied by by the reading of water meter 4 of shunt pipe 3
Fixed multiplication factor is field dewatering outlet door flow of inlet water, realizes that measure control needs so as to meet most final stage field dewatering outlet
Will, fundamentally realize by the management of the use of water needs of " metering pack piece " to " being metered into family ", can solve canal irrigation area
Field water metering problem；Supervisor is by straight length 2, reducer 5 and tailpipe section 6 is end to end successively forms, the port of straight length 2
It is water inlet in insertion final stage channel, by water inlet diversion to being responsible for, supervisor's design of reducing tubular type solves irrigation water
(it is less than 20cm) when channel ordinary water level and smaller elevation difference of field surface, only by less Pitot tube differential pressure, passes through the flow of shunt pipe
Smaller, the ratio of field dewatering outlet door flow and meter reading is high, is easily caused the problem of measuring accuracy is not high；With the tail pipe of supervisor
The joint of 6 ends of section connection is 45 ° of elbows 7, i.e., the angle of the arc section 8 and horizontal plane of 45 ° of elbows is as can be seen from Figure 1
45 °, and the peak of delivery port section 9 of 45 ° of elbows 7 is concordant with the top of tailpipe section 6 of supervisor in vertical direction, delivery port is cut
Face 9 is 0~30 ° with horizontal plane angle, and the utility model is applied widely, and measurement accuracy is higher, can ensure that full packages goes out stream, subtract
Few resistance to water-flow, makes current more unobstructed.
Generally, the ratio between the tailpipe section 6 of main pipeline described in embodiment and the caliber of straight length 2 is 0.6-1.0.Can
According to channel ordinary water level and elevation difference of field surface situation, the different ratio of reasonable selection, when channel ordinary water level and elevation difference of field surface are big, to lead to
Taken large values during often greater than 50cm, channel ordinary water level and elevation difference of field surface hour, generally less than 20cm gets the small value, such as value can be
0.6th, 0.7,0.8 or 1.0 etc..
For the ease of according to design irrigation quantity open and close, in prior art designs, can be set after water inlet with stream
The miniature gate 11 that the caliber of amount supervisor coincide.For further optimization design, the present embodiment is after the water inlet of the supervisor
Portion adds a miniature trash rack 12 good with supervisor's goodness of fit, and miniature trash rack 12 and miniature gate 11 are front and rear to arrange, miniature
Trash rack 12 is located at the front met to current, is placed on jointly in the vertical notch 1 of supervisor's water inlet metastomium, in supervisor's water inlet
Rear portion has vertical notch 1 (first half fluting being responsible for), and the thickness that miniature gate 11 and miniature trash rack 12 are added is with hanging down
Consistent to the width of notch 1, miniature trash rack 12 plays a part of filtering, prevents weeds, debris enter from blocking this water meter.
Referring to Fig. 2 and Fig. 3, when existing miniature gate 11, when being designed to the board plug structure that top is square, bottom is circular,
The miniature trash rack 12 in the present embodiment is then designed as with consistent with miniature gate 11 in top is square, lower semicircular
The outer shape of shape, its square top is square plate and fence, and lower semicircular shape is fence, and semicircular fence can be logical
Cross vertical fence bar to be formed by the way that φ 4mm reinforcing bar 12-2 connections are integral in bottom, more specifically realize organization plan
Can be the reinforcing bar 12-1 using φ 4mm as fence bar, bar spacing 40mm, top is square be fixed into lower semicircular shape it is whole
Body forms miniature trash rack 12.The size of the semicircle fence of the size of the semicircular-shaped lower portion of plate and miniature trash rack 12 with
The caliber of supervisor coincide, the square top of plate and the square plate of miniature trash rack 12 all with notch clamping, back card/back board
Square and semi-circular portion is blocked to the internal diameter formation of supervisor jointly, and shielded area moves downward gradual increase with gate,
Flow control is realized, until block to form flow closing completely, and the fence of miniature trash rack 12 is always positioned at shape inside pipeline
The stop of paired weeds debris.But the concrete structure not limited to this of miniature gate 11, other can realize that irrigation quantity is opened and closed
The structure type closed, therefore the profile of miniature trash rack 12 can also have a variety of change shapes therewith, as long as can realize
Obstruct weeds, the structure type of debris effect is applicable.In addition, in the upper end of miniature gate 11 and miniature trash rack 12
Can be that miniature gate 11 and miniature trash rack 12 increase by lifting gate grip hole 10 to open up lifting gate grip hole 10
Handle, it is more convenient for operating.
For from material, the square plate 13 of the miniature trash rack can use PVC board to make, and its fence is from thin
Reinforcement fabrication forms.Other routines can meet that the material of use environment needs also can be selected.
As the preferred design of the present embodiment, the water meter 4 installed on the horizontal branch pipe selects small-bore waterwheel
Formula water meter or ultrasonic water meter or electromagnetism water meter.Waterwheel-type water meter is particularly preferably used, the water meter anti-blocking performance is excellent, energy
The winding of silt and weeds in water is prevented, is applicable the water containing a small amount of weeds and solid small particles, is widely used in agricultural irrigation use
The metering of the occasion such as water and sewage disposal.
As shown in Figure 1 and Figure 4, for the safe and stable operation of digital preservation water meter 4, according to the appearance and size of water meter 4, only exist
The outside of water meter 4 installs totally-enclosed special miniature meter box 14.Water meter 4 is placed in totally-enclosed special miniature meter box 14, with water
The shunt pipe 3 that table 4 connects passes totally-enclosed special miniature meter box 14, shunt pipe 3 and totally-enclosed special miniature meter box
14 carry out encapsulation process, such as the gap location between shunt pipe 3 and totally-enclosed special miniature meter box 14 using filler 16
Sealed using glass cement or spunyarn as filler 16；Can also be totally-enclosed special miniature further in order to easy to maintenance
Meter box 14 designs the structure that the grade easy access of case lid 15 is checked；The totally-enclosed special miniature meter box 14, it is rational in infrastructure, take
Batch production integral manufacturing, fast and easy installation.Wherein, the special miniature meter box of the totally-enclosed from PVC, fiberglass,
Ceramics or concrete etc. are prefabricated, and when the material of the special miniature meter box of totally-enclosed is prefabricated for C30 concretes, totally-enclosed is special micro-
The wall thickness of type meter box is set to 30mm, when its material is ceramic, wall thickness 10mm, and when its material is PVC, wall thickness 5mm, and it is complete
The usual setting scope of the wall thickness of closed special miniature meter box is 5-30mm.
More similar to technical principle of the present utility model is designed as agricultural shunt type flowmeter.Agricultural shunting water meter
Be supervisor with venturi (Venturi) pipe, connect a branched pipe at its trunnion position, the import of branched pipe be located at supervisor it is upper or with it is upper
Swimming position is connected, installation water meter among branch pipe.The pressure difference and the pressure difference of branch pipe of water meter supervisor is identical, this pressure difference (H) with
The main conduit flow (Q) of water meter and branch pipe flow (q) it is square directly proportional.The main conduit flow of water meter and the ratio of branch pipe flow
Value M is constant in certain pressure differential range, unrelated with magnitude of pressure differential.The branch pipe water amount measured by water meter be multiplied by M values i.e. based on
Total water amount of pipe.
Technical principle of the present utility model is as follows：
Pass through water in a certain cross-section of riverFor a certain fixed pressure conduit section, mistake
Water cross-sectional area S is known constant, Q to be askedt, a demand goes out.From hydraulics, on round pipe active cross-section,
Each point flow velocity, but velocity flow profile is regular follows, if it is possible to a point of the cross-section of river is found, the flow velocity can represent whole
If the mean flow rate of individual circle cross section, then, as long as test measures the flow velocity of the point, so that it may calculate the stream for flowing through the pipeline
Amount.
1. the determination of average rate point position：
Hydraulics teaches that the rate of flow of fluid distribution in pipeline has laminar flow and turbulent two classes, the speed of fluid
Distribution is relevant with viscosity, caliber, the speed of fluid, and the flow regime of fluid is generally characterized with reynolds number Re.When Re≤
It is laminar flow when 2320, Re is turbulent flow when being much larger than 2320.Shown by a host of facts, the velocity flow profile of round pipe is mostly turbulent shape
State.Turbulent condition can be represented with the Ni Gulazi empirical equations in hydrodynamics：
In formula：U (r) --- the flow velocity of any point in round pipe；
Vc --- the flow velocity in round pipe on central shaft；
The radius of R --- round pipe；
Distance of r --- the measured point to circular shaft center；
The Reynolds number index of n --- pipeline fluid.
By the Line Integral to formula (1), then divided by the area of a circle, you can obtain mean flow rate
Generally, the Reynolds number of turbulent pipeline is both greater than 5000, is calculated by Ni Gulazi experimental datas or by relevant formula, n
Value can then obtain y about in 0.25R, this is that smooth tube is derived certainly about between 7-11.To rough tube, due to
There is bigger shear force at tube wall, it will prevent more flow of fluid.I.e. certain Reynolds number, when roughness increases, speed
Distribution curve then becomes slightly sharp, and y values may increase.Equally, under the conditions of certain roughness, Reynolds number increase, y values reduce,
In some standards, (3) formula is substituted into n=7, positions of the y=0.242R as mean flow rate point, that is, measures inner-walls of duct as pipe
The 0.121D in road0The flow velocity at place, as mean velocity in sectionCross-section of river A flow Q can be calculated.
2. amount water principle
From hydraulics：In the steady flow of aqueduct straightway, two cross-section of river A, B flows are equal, and two cross water
Section energy equation is：
Main conduit flow's formula is：
In formula：hAB--- the pressure difference of AB point-to-point transmissions；
D --- tailpipe section diameter；
For shrinkage factor；
μ --- discharge coefficient, determined by experiment.
Shunt pipe flow formula is：
In formula：hAB--- the pressure difference of AB point-to-point transmissions；
εBranch--- the total local loosening of branch pipe；
D --- branch pipe water meter nominal diameter.
Show that flow-rate ratio is by formula (2), (3)：
D, d, ρ are constant in formula, and μ is the constant related to D, d, ρ.If ε branch keeps constant constant, flow-rate ratio m
Also it is constant.
In formula：W --- water meter crosses water inventory within the t periods；
Water amount of w --- the water meter within the t periods, water meter reading difference twice as before and after water flowing.
It can be drawn by formula (5)：The water inventory excessively of water meter is directly proportional to water meter water amount within the same period, with water supply
Pressure difference is unrelated.This is the amount water principle of the water meter.
The water meter principle is reliable, is not limited by flow velocity, and amplification ratio M is constant in certain pressure differential range, with pressure difference
Size is unrelated, and flow measurement scope is big, and amount crystal degree is high；Gauge table is arranged in bypass, and simple in construction, resistance piece is small, the loss of flood peak
It is small, main conduit flow is not influenceed, negotiability is big, does not consume the energy；Not by physical parameters impacts such as temperature, electrical conductivity, viscosity, fit
The aqueduct of various calibers is answered to install, high sensitivity；Manufacture craft is simple, and operation is easy for installation, and Maintenance and Repair workload is small,
Low cost.
It is described above, only it is preferred embodiment of the present utility model, any formal limit is not done to the utility model
System, it is every according to the technical essence of the utility model, any simple modification and equal change are made to above example, is fallen
Enter within the scope of protection of the utility model.
Claims (8)
1. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunts Venturi tube water meter, including supervisor and shunt pipe (3),
Water meter (4) is installed on horizontal branch pipe, it is characterized in that：It is described supervisor by straight length (2), reducer (5) and tailpipe section (6) according to
Secondary end to end composition, the interior port insertion final stage channel of straight length (2) is water inlet, and irrigation water passes through water inlet diversion to master
Pipe, the joint being connected with tailpipe section (6) end of supervisor is 45 ° of elbows (7), and the delivery port section (9) of 45 ° of elbows (7) is most
High point is concordant with tailpipe section (6) top of supervisor in vertical direction, and delivery port section (9) are 0~30 ° with horizontal plane angle.
2. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 1 shunts Venturi tube water meter, its
It is characterized in：Ratio between the tailpipe section (6) of the main pipeline and the caliber of straight length (2) is 0.6-1.0.
3. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 1 or 2 shunts Venturi tube water meter,
It is characterized in that：A miniature trash rack (12) good with supervisor's goodness of fit is added in the water inlet metastomium of the supervisor, it is miniature to block
Dirty grid (12) and the front and rear arrangement of miniature gate (11), are placed in the vertical notch (1) of supervisor's water inlet metastomium jointly.
4. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 3 shunts Venturi tube water meter, its
It is characterized in：The miniature trash rack (12) has consistent with miniature gate (11) in top is square, the outside of lower semicircular shape
Shape, it is square plate and fence that its top is square, and lower semicircular shape is fence, top is square be fixed into lower semicircular shape it is whole
Body forms miniature trash rack (12).
5. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 4 shunts Venturi tube water meter, its
It is characterized in：The square plate (13) of the miniature trash rack is made using PVC board, and its fence is made from fine steel rib.
6. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 1 or 2 shunts Venturi tube water meter,
It is characterized in that：The water meter (4) installed on the horizontal branch pipe, preferentially select Waterwheel-type water meter either ultrasonic water meter or electricity
Magnetic water meter.
7. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 1 or 2 shunts Venturi tube water meter,
It is characterized in that：According to the shape of water meter (4), totally-enclosed special miniature meter box (14) only is installed in the outside of water meter (4).
8. a kind of canal irrigation field dewatering outlet door Pitot tube differential pressure according to claim 7 shunts Venturi tube water meter, its
It is characterized in：Described totally-enclosed special miniature meter box (14) is pre-formed from PVC, fiberglass, ceramics or concrete.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720520484.1U CN206862427U (en) | 2017-05-11 | 2017-05-11 | A kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720520484.1U CN206862427U (en) | 2017-05-11 | 2017-05-11 | A kind of canal irrigation field dewatering outlet door Pitot tube differential pressure shunting Venturi tube water meter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921919A (en) * | 2021-01-29 | 2021-06-08 | 河北工程大学 | Metering device is irrigated to accuracy |
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2017
- 2017-05-11 CN CN201720520484.1U patent/CN206862427U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112921919A (en) * | 2021-01-29 | 2021-06-08 | 河北工程大学 | Metering device is irrigated to accuracy |
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