CN208238853U - A kind of canal capacity automated watch-keeping facility - Google Patents
A kind of canal capacity automated watch-keeping facility Download PDFInfo
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- CN208238853U CN208238853U CN201820746493.7U CN201820746493U CN208238853U CN 208238853 U CN208238853 U CN 208238853U CN 201820746493 U CN201820746493 U CN 201820746493U CN 208238853 U CN208238853 U CN 208238853U
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- weir
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- crested
- level sensor
- crested weir
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Abstract
The utility model discloses a kind of canal capacity automated watch-keeping facilities, which is characterized in that including sharp-crested weir, liquid level sensor, sludge level sensor, data acquisition process unit；Wherein, the sharp-crested weir is mounted on selected canal capacity monitoring section position, the two sides at the weir plate edge of the sharp-crested weir are installed by one liquid level sensor respectively, the sludge level sensor is mounted on the side weir mouth bottom end that meets water of the sharp-crested weir, and the liquid level sensor, sludge level sensor pass through signal cable respectively and connect with the data acquisition process unit.Agricultural irrigation efficiency can be improved in the utility model, saves agricultural water, the cost for reducing water-measuring device, the accuracy and performance for enhancing water measure equipment, pushes the automation development of measuring technology.
Description
Technical field
The utility model relates to a kind of canal capacity automated watch-keeping facilities, belong to agricultural irrigation metering channel monitoring technology neck
Domain.
Background technique
China's water resource critical shortage, and the water consumption of agricultural irrigation area is very huge.Therefore, the water-saving work of agricultural irrigation area
Work must grab tight.Although irrigated area measuring technology cannot directly reduce Irrigation Water amount, it is the mark that irrigated area carries out plan irrigation
Ruler.Irrigated area is reasonably irrigated by this scale, the water consumption of agricultural irrigation area can be greatly reduced.So accelerating agriculture
The development of industry irrigated area measuring technology, accurately measures the water demand of agricultural irrigation area day part, each location, therefore, raising amount
Water technology reduces the cost of water-measuring device, enhances the accuracy and performance of water measure equipment, and the automation of measuring technology is pushed to send out
Exhibition saves water agricultural irrigation area particularly significant.
The water flow of farmland irrigated area channel is typically in the water in a canal fluidised form of Free Surface, can be based on open channel flow rate detection method pair
Carrying capacity is detected, and common open-channel meter mainly has weir formula and slot type two major classes, and principle is by flowing in detection canal
Body carries out phase relative to the liquid level for having predetermined distance on flowmeter position, further according to the structural property parameter of specific flowmeter
That answers is calculated fluid flow.
Traditional weir flowmeter can only monitor one-way flow, and the influence because of canal silting for flow monitoring is without pre-
Alert mechanism.Traditional flume flow meter is more demanding to channel, needs straight section of longer channel, upstream and downstream can not have an impact
The structures of flow condition, and one-way flow can only be surveyed.
Utility model content
The purpose of this utility model is to provide a kind of canal capacity automated watch-keeping facilities, are applicable in agricultural irrigation area and measure water conservancy project
Make, agricultural irrigation efficiency can be improved, saves agricultural water, the cost for reducing water-measuring device, the accuracy for enhancing water measure equipment
And performance, push the automation development of measuring technology.Canal capacity automated watch-keeping facility provided by the utility model, principle are
By liquid level of the fluid relative to predetermined distance on sharp-crested weir in detection canal, join further according to the architectural characteristic of specific flowmeter
Number carries out that fluid flow is calculated accordingly.
The technical solution adopted in the utility model is:
A kind of canal capacity automated watch-keeping facility, which is characterized in that passed including sharp-crested weir, liquid level sensor, sludge level
Sensor, data acquisition process unit；Wherein, the sharp-crested weir is mounted on selected canal capacity monitoring section position, the thin-walled
A liquid level sensor is installed in the two sides at the weir plate edge on weir respectively, and the sludge level sensor is mounted on the sharp-crested weir
The side weir mouth bottom end that meets water, the liquid level sensor, sludge level sensor pass through signal cable and the data respectively and acquire
Processing unit connection.
Further, position is closed in the side weir mouth lowest point that meets water that the sludge level sensor is mounted on the sharp-crested weir
It sets.
Further, the crest of weir top surface of the sharp-crested weir is horizontal plane, at the top of the crest of weir of the sharp-crested weir with it is described
The upstream face intersection of sharp-crested weir forms sharp-edged.
Further, the sharp-edged thickness is between 1-2mm.
Further, the crest of weir side of the sharp-crested weir and the upstream face intersection of the sharp-crested weir form sharp-edged.
Further, the maximum allowable thickness at the top of the crest of weir that the weir plate thickness of the sharp-crested weir is greater than the sharp-crested weir
When, the downstream peristoma of the sharp-crested weir is designed as inclined-plane, and the weir crest face angle on the inclined-plane and the sharp-crested weir is not less than
45°。
Further, further include a precipitation rain fall sensor, connect by signal cable with the data acquisition process unit；
The sludge level sensor is the ultrasonic level gage of aqueous medium.
Further, unit is uploaded in monitoring by the remote mode progress data of GPRS channel at the data acquisition
The heart.
Further, the sharp-crested weir is rectangle thin-wall weir or triangle sharp-crested weir.
The canal capacity automated watch-keeping facility of the utility model mainly includes sharp-crested weir, liquid level sensor, sludge level biography
Sensor, precipitation rain fall sensor, data acquisition process unit and power supply unit；Sharp-crested weir is mounted on selected canal capacity monitoring section position
It sets；Liquid level sensor, sludge level sensor are mounted on sharp-crested weir by bracket, wherein liquid level sensor is mounted on weir plate
The two sides at edge, sludge level sensor are mounted on the following adjacent locations in side weir mouth lowest point that meet water, and sensor monitoring direction refers to
To underface；Sensor signal is transferred to data acquisition process unit by signal cable；Unit passes through GPRS at data acquisition
The remote mode of channel carries out data upload.The water level number that data acquisition process unit is passed back according to sharp-crested weir parameter and in real time
According to, calculate channel mean flow rate, instantaneous flow in real time using flow velocity/area-method, data acquisition process unit according to instantaneous flow,
The water time is spent multiplied by channel, obtains channel water Q；Wherein,CeFor discharge coefficient, g adds for gravity
Speed, beFor the effective width being calculated according to the liquid level of the weir plate size of sharp-crested weir and liquid level sensor acquisition, heFor
Effective head.
Sludge level sensor in the utility model pops one's head in using the ultrasonic level gage of aqueous medium and is mounted on weir
In the water of plate upstream, the sludge level sensor surface direction of the launch is towards underface, and when channel bottom does not deposit, it is monitored
Numerical value be a constant, when there is siltation to generate, because detecting head surface and canal bottom distance reduce, the numerical value of monitoring can also subtract
It is small, when reaching or less than a preset critical value, determine that siltation reaches the standard of scene cleaning.It in this way can be utmostly
It avoids influencing flow monitoring because of siltation.
The utility model is using the working principle of technical solution: real-time by the liquid level sensor being mounted on sharp-crested weir
Waterlevel data is sent to data acquisition process unit on acquisition sharp-crested weir weir, and data acquisition process unit is according to the water level received
Data calculate draining instantaneous flow, are denoted as Qs；Integrated flow is denoted as Q；Its flow can be calculated as follows:
Two classes can be divided into for rectangle thin-wall weir flow rate calculation formula: one is the formula (b/B ≠ 1) of basic weir shape；Its
Second is that the formula (b/B=1.0) without contracted weir.
Basic weir-type formula (b/B ≠ 1)
Kayts water-Ka Te formula
Q in formula-flow, the i.e. water amount of unit time；
Ce- discharge coefficient；
G-acceleration of gravity, m/ms2；
be- effective width, m；It is calculated according to weir plate size and liquid level；
he- effective head, m；By liquidometer come real-time measurement.
The utility model proposes the beneficial effect of technical solution be:
The feature that the structure for being utilized sharp-crested weir flow detection part is simple, flow detection range is wide, and pass through setting monitoring
Liquid level calculates flow, can provide irrigated area channel mud deposit depth data simultaneously.It is simple with structure, be easily installed, tie up
The feature that shield maintenance is convenient, flow detection range is wide, measurement accuracy is high well adapts to the metering of farmland irrigated area channel hydraulic pipeline
Property.
The utility model carries out remote transmission to monitoring parameters using equipment remote communications capability, between system components
Mutual independence increases the removable and maintainable of system so that device takes into account installation and protection.
Detailed description of the invention
The utility model is described further with reference to the accompanying drawing:
Fig. 1 is canal capacity automated watch-keeping facility (triangle sharp-crested weir) scheme of installation of the utility model.
Fig. 2 is canal capacity automated watch-keeping facility (rectangle thin-wall weir) scheme of installation of the utility model.
Fig. 3 is rectangular weir (basic weir-type) schematic diagram.
Fig. 4 is rectangle thin-wall weir schematic diagram.
(a) sharp-crested weir main view, (b) sharp-crested weir Section A-A figure, (c) sharp-crested weir part B partial enlargement diagram, (d)
Sharp-crested weir top view, (e) sharp-crested weir C portion partial enlargement diagram.
Fig. 5 is that sharp-crested weir is connected schematic diagram；
Wherein, 1- rectangular weir, 11- triangular-notch weir, 2- liquid level sensor, 3- sludge level sensor, 4- precipitation rain fall sensor, 5-
Data acquisition process unit, 6- power supply unit, 44- crest of weir side, 45- crest of weir top surface, 46- weir plate upstream face, 47- are sharp
Edge, 64- liquid level sensor L-type support, 65- sludge level sensor u-bracket.
Specific embodiment
The canal capacity automated watch-keeping facility in the example of the utility model is carried out with reference to the accompanying drawing clear and complete
Description.
Canal capacity automated watch-keeping facility described in the utility model is as shown in Figure 1, mainly include sharp-crested weir, level sensing
Device 2, sludge level sensor 3, precipitation rain fall sensor 4, data acquisition process unit 5 and power supply unit 6；Sharp-crested weir can be rectangle
Weir 1 or triangular-notch weir 11 are mounted on canal capacity monitoring section position；Liquid level sensor 2, sludge level sensor 3 pass through bracket
Installation (liquid level sensor L-type support 64 and sludge level sensor u-bracket 65, as shown in Figure 5) is on sharp-crested weir, wherein
Liquid level sensor 2 is mounted on the two sides of the top edge of the weir plate of sharp-crested weir, and sludge level sensor 3 is mounted on the crest of weir of sharp-crested weir
Meet water the following adjacent locations of side weir mouth, and sludge level sensor monitoring direction is downwardly directed；Sensor signal passes through signal cable
It is transferred to data acquisition process unit；Unit carries out data upload by the remote mode of GPRS channel at data acquisition.This reality
Different amount water sharp-crested weirs is designed according to different channel widths, depth and water amount with novel, should be as far as possible located at weir straight
(water flow, less than 0.5, has segment length straight enough, is suitable for surveying in unhurried current situation or Floyd's algorithm in horizontal riverbed close with the row of rectangle
Measure one section of riverbed of desired neighbouring flow measuring structure or hydraulic structure upstream) on.But if crest of weir effective area and upper
Trip riverbed area does not then require the shape in riverbed so that approach velocity can be ignored compared to very little.
The waterlevel data acquired in real time by liquid level sensor, data acquisition process unit receive waterlevel data, calculate
Instantaneous flow is drained, Q is denoted as；Its flow can be calculated as follows:
Q in formula-flow
Ce- discharge coefficient；
G-acceleration of gravity, unit m/ms2；
be- effective width, unit m；
he- effective head, unit m.
Canal capacity automated watch-keeping facility (rectangle thin-wall weir) scheme of installation of the utility model is as shown in Figure 2.
The requirement of rectangle thin-wall weir crest of weir
Basic weir shape is that rectangular aperture is equipped on a vertical thin plate.Weir plate wants smooth, firm, and perpendicular to quaywall
The upstream face in riverbed close with row, weir plate must be smooth, as shown in Figure 3.
Crest of weir top surface 45 is a horizontal plane, in itself and 46 intersection of weir plate upstream face formation sharp-edged 47.Perpendicular to
The weir crest sharp-edged thickness that weir plate planar survey arrives should be between 1-2mm.Crest of weir side 44 be it is vertical, intersect with weir plate upstream face
Place forms sharp-edged 47.For the extreme case of contracted weir, weir crest is stretched over riverbed two sides, and the quaywall by weir crest is plane, and
It is smooth.Rectangle thin-wall weir weir crest and crest of weir two sides schematic diagram are as shown in Figure 4.
It is sharp-edged for guarantee weir crest upstream edge and crest of weir two sides, by its processing and polishing, perpendicular to the upstream of weir plate
Face cannot have indentation burr, cannot be wiped and be put down with coated abrasive, if weir plate is also thicker than the maximum allowable thickness at the top of crest of weir,
Downstream peristoma will be used as inclined-plane.The angle in the inclined-plane and weir crest face is not less than 45 °.
3. flow rate calculation formula
Two classes can be divided into for rectangle thin-wall weir flow rate calculation formula: one is the formula (b/B ≠ 1) of basic weir shape；Its
Second is that the formula (b/B=1.0) without contracted weir.
Basic weir-type formula (b/B ≠ 1)
Kayts water-Ka Te formula
Q in formula-flow
Ce- discharge coefficient
G-acceleration of gravity, m/ms2
be- effective width, m
he- effective head, m
1 rectangular thin-wall Kayts water-Ka Te formula use condition of table
| h/P | h(m) | b(m) | P(m) | (B-b)/2/(m) |
| ≤2.5 | ≥0.03 | ≥0.15 | ≥0.10 | ≥0.10 |
CeValue can be acquired by formula listed by table 2.For the median of b/B, CeValue is determined by interpolation.
Flow coefficient CeBe as two variables function it is tests determined.
B in formula-the crest of weir width measured, m；
The nearly channel width of B row, m
The head of h measurement, m
The height of P weir crest, m
Effective width and head calculation formula are
be=b+Kb
he=h+Kh
K in formulab、Kh- to the corrected value of the combined influence of viscous force and surface tension, wherein KbIt is the function of b/B, by reality
Test determination；KhFor the weir built in strict conformity with regulation, which can use constant 0.001m.
2 rectangle thin-wall weir discharge coefficient table of table
According to rectangle thin-wall weir size and table look-up:
C can be obtained by b/B=1.5 (crest of weir is wide)/2.5 (river is wide)=0.6e=0.593+0.18h/p；By h/p=0.8
(head)/1 (weir crest height)=0.8 can obtain Ce=0.593+0.18 × 0.8=0.737；
K can be checked inb=3.6=0.0036m；So be=b+Kb=1.5+0.0036=1.5036
he=0.8+0.001=0.801
So
The 3 1.5m rectangular weir stage-discharge table of comparisons (water level unit: m, flux unit L/s) of table
| Water level | 0.000 | 0.05 | 0.1 | 0.15 | 0.2 | 0.25 | 0.3 | 0.35 |
| Flow | 0.0000 | 30.773 | 87.035 | 177.75 | 251.54 | 356.04 | 474.16 | 605.39 |
| Water level | 0.4 | 0.45 | 0.5 | 0.55 | 0.6 | 0.65 | 0.7 | 0.75 |
| Flow | 749.39 | 905.93 | 1074.83 | 1256.03 | 1449.43 | 1655.00 | 1872.92 | 2102.61 |
| Water level | 0.8 | |||||||
| Flow | 2344.69 |
4. installation requirement
Weir should be located at straight horizontal and rectangle by sharp-crested weir installation as far as possible in addition to the general provision for following mill weir installation
(water flow, less than 0.5, has segment length straight enough, is suitable for the neighbouring of measurement request in unhurried current situation or Floyd's algorithm in row nearly riverbed
One section of riverbed of flow measuring structure or hydraulic structure upstream) on.But if crest of weir effective area and upstream channel area phase
Than very little, so that approach velocity can be ignored, then the shape in riverbed is not required.
When weir crest height very little or h/p very big more than the bottom of riverbed, the nearly riverbed bottom of row should smooth, smooth and water
It is flat.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, the skill of this field
Art personnel, it is to be appreciated that any modification made within the spirit and principle of the present invention, equivalent replacement or improvement etc.,
It should be included within the scope of protection of this utility model, protection scope is subject to those as defined in claim.
Claims (9)
1. a kind of canal capacity automated watch-keeping facility, which is characterized in that including sharp-crested weir, liquid level sensor, sludge level sensing
Device, data acquisition process unit；Wherein, the sharp-crested weir is mounted on selected canal capacity monitoring section position, the sharp-crested weir
The two sides at weir plate edge one liquid level sensor is installed respectively, the sludge level sensor is mounted on the sharp-crested weir
Meet water side weir mouth bottom end, and the liquid level sensor, sludge level sensor pass through respectively at signal cable and the data acquisition
Manage unit connection.
2. canal capacity automated watch-keeping facility as described in claim 1, which is characterized in that the sludge level sensor installation
In the side weir mouth lowest point adjacent locations that meet water of the sharp-crested weir.
3. canal capacity automated watch-keeping facility as described in claim 1, which is characterized in that table at the top of the crest of weir of the sharp-crested weir
Face is horizontal plane, forms sharp-edged with the upstream face intersection of the sharp-crested weir at the top of the crest of weir of the sharp-crested weir.
4. canal capacity automated watch-keeping facility as claimed in claim 3, which is characterized in that the sharp-edged thickness 1-2mm it
Between.
5. canal capacity automated watch-keeping facility as claimed in claim 3, which is characterized in that the crest of weir side of the sharp-crested weir with
The upstream face intersection of the sharp-crested weir forms sharp-edged.
6. canal capacity automated watch-keeping facility as claimed in claim 5, which is characterized in that when the weir plate thickness of the sharp-crested weir
When greater than maximum allowable thickness at the top of the crest of weir of the sharp-crested weir, the downstream peristoma of the sharp-crested weir is designed as inclined-plane, and
The weir crest face angle of the inclined-plane and the sharp-crested weir is not less than 45 °.
7. canal capacity automated watch-keeping facility as described in claim 1, which is characterized in that it further include a precipitation rain fall sensor,
It is connect by signal cable with the data acquisition process unit；The sludge level sensor is the supersonic liquid level of aqueous medium
Meter.
8. canal capacity automated watch-keeping facility as described in claim 1, which is characterized in that unit passes through at the data acquisition
The remote mode of GPRS channel carries out data and is uploaded to monitoring center.
9. canal capacity automated watch-keeping facility as described in claim 1, which is characterized in that the sharp-crested weir is rectangle thin-wall weir
Or triangle sharp-crested weir.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820746493.7U CN208238853U (en) | 2018-05-18 | 2018-05-18 | A kind of canal capacity automated watch-keeping facility |
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|---|---|---|---|
| CN201820746493.7U CN208238853U (en) | 2018-05-18 | 2018-05-18 | A kind of canal capacity automated watch-keeping facility |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109752053A (en) * | 2019-03-04 | 2019-05-14 | 北京建筑大学 | The inlet for stom water flow measurement device of energy auto-flushing |
| CN109974804A (en) * | 2019-03-29 | 2019-07-05 | 湖南都江工程科技有限公司 | One kind installing fixed apparatus for examination and repair based on Doppler's open-channel meter |
| CN110017874A (en) * | 2019-04-24 | 2019-07-16 | 中国水利水电科学研究院 | Runoff measuring device and diameter flow measuring method |
| CN110441833A (en) * | 2019-09-10 | 2019-11-12 | 长江水利委员会长江科学院 | A kind of super large range weir formula atomization self-operated measuring unit and method |
| CN110763289A (en) * | 2019-10-14 | 2020-02-07 | 朱晓璞 | River course cross section measuring device |
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2018
- 2018-05-18 CN CN201820746493.7U patent/CN208238853U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109752053A (en) * | 2019-03-04 | 2019-05-14 | 北京建筑大学 | The inlet for stom water flow measurement device of energy auto-flushing |
| CN109752053B (en) * | 2019-03-04 | 2024-03-26 | 北京建筑大学 | Automatic flushing gutter inlet flow measuring device |
| CN109974804A (en) * | 2019-03-29 | 2019-07-05 | 湖南都江工程科技有限公司 | One kind installing fixed apparatus for examination and repair based on Doppler's open-channel meter |
| CN109974804B (en) * | 2019-03-29 | 2020-08-14 | 湖南都江工程科技有限公司 | Installation, fixation and maintenance device based on Doppler open channel flowmeter |
| CN110017874A (en) * | 2019-04-24 | 2019-07-16 | 中国水利水电科学研究院 | Runoff measuring device and diameter flow measuring method |
| CN110441833A (en) * | 2019-09-10 | 2019-11-12 | 长江水利委员会长江科学院 | A kind of super large range weir formula atomization self-operated measuring unit and method |
| CN110763289A (en) * | 2019-10-14 | 2020-02-07 | 朱晓璞 | River course cross section measuring device |
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Granted publication date: 20181214 |