CN206670698U - A kind of pipeline Pitot tube shunting water meter - Google Patents
A kind of pipeline Pitot tube shunting water meter Download PDFInfo
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- CN206670698U CN206670698U CN201720365006.8U CN201720365006U CN206670698U CN 206670698 U CN206670698 U CN 206670698U CN 201720365006 U CN201720365006 U CN 201720365006U CN 206670698 U CN206670698 U CN 206670698U
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Abstract
A kind of pipeline Pitot tube shunting water meter, including main pipeline and measurement branch pipe, two ends of main pipeline are provided with flange, water meter is connected in the duct by the flange at main pipeline both ends, measurement arms parallel is arranged on the sidepiece of main pipeline, measure Pitot tube of the branch pipe by an opening face flow velocity direction, one connecting branch and the pressure-measuring pipe of an opening vertical flow velocity direction are formed, Pitot tube is made up of a horizontal segment and a vertical section head and the tail connection, Pitot tube is arranged near the average rate point position of main pipeline, the horizontal segment of Pitot tube is located at the inside of main pipeline and fixed at its inwall 0.125D, D is the nominal diameter of flow supervisor, the vertical section external port of Pitot tube is communicated to the external port of pressure-measuring pipe by connecting branch, water meter is also equipped with connecting branch.The utility model manufacture craft is simple, and operation is easy for installation, and Maintenance and Repair workload is small, low cost；Can solve the problems, such as the water metering of piping transportation water irrigation engineering.
Description
Technical field
The utility model belongs to piping transportation water irrigation field of measuring techniques, is related to a kind of metering device of pipeline water delivery, especially
It is a kind of pipeline Pitot tube shunting water meter.
Background technology
At present, existing pipeline water delivery measuring instrument have rotor water gauge, pipeline spinner flowmeter, differential pressure flowmeter,
Restriction flowmeter, slit flowmeter, volume-displacement, electromagnetic flowmeter, ultrasonic flowmeter etc., general pipe diameter are got over
Greatly, price is higher, it is impossible to meets wide pipeline irrigation engineering, big, the anti-impurity of amount, the production needs of low cost.
The content of the invention
In order to overcome the above-mentioned deficiency of prior art, the utility model provides a kind of pipeline Pitot tube shunting water meter,
Do not limited by flow velocity, flow measurement scope is big, and amount crystal degree is high；It is easy for installation, it is simple in construction, do not consume the energy；Not by temperature, conductance
The physical parameters impacts such as rate, viscosity, adapt to the aqueduct installation of various calibers, high sensitivity；Manufacture craft is simple, operation peace
Dress is convenient, and Maintenance and Repair workload is small, low cost；Can solve the problems, such as the water metering of piping transportation water irrigation engineering.
The utility model solves the technical scheme that its technical problem uses：Including main pipeline and measurement branch pipe, main pipeline
Two ends be provided with flange, by the flange connection at main pipeline both ends in the duct, measurement arms parallel is set water meter
In the sidepiece of main pipeline, measurement branch pipe is by the Pitot tube in an opening face flow velocity direction, a connecting branch and an opening
The pressure-measuring pipe of vertical flow velocity direction is formed, and Pitot tube is made up of a horizontal segment and a rear end vertical section head and the tail connection, Pitot
For pipe near the average rate point position of main pipeline, the horizontal segment of Pitot tube is located at the inside of main pipeline and apart from its inwall
Fixed at 0.125D, D is the nominal diameter of flow supervisor, and the vertical section external port of Pitot tube is communicated to pressure measurement by connecting branch
The external port of pipe, is also equipped with water meter on connecting branch.
Compared to existing flowmeter, a kind of pipeline Pitot tube shunting water meter of the present utility model, managed using standardization
Part makes, and is provided with main pipeline and measurement branch pipe, and two ends of main pipeline are provided with flange, and water meter passes through main pipeline two
In the duct, measurement arms parallel is arranged on the sidepiece of main pipeline, and measurement branch pipe is by an opening face for the flange connection of end
The pressure-measuring pipe of the Pitot tube in flow velocity direction, a connecting branch and an opening vertical flow velocity direction is formed, and Pitot tube is by one
Horizontal segment and a rear end vertical section head and the tail connection composition, Pitot tube are arranged near the average rate point position of main pipeline, Pitot tube
Horizontal segment be located at the inside of main pipeline and at its inwall 0.125D fix, D be flow supervisor nominal diameter, Pitot tube
Vertical section external port the external port of pressure-measuring pipe is communicated to by connecting branch, water meter is also equipped with connecting branch, is utilized
Pitot tube difference gauge principle, total flow and the measurement branch pipe meter reading of main pipeline pass through testing equipment Accurate Calibration, determine water
Meter reading and main pipeline total flow multiple proportion, the multiplication factor i.e. main pipeline that demarcation is multiplied by by measurement branch pipe meter reading always flow
Amount；Principle of the present utility model is reliable, is not limited by flow velocity, and amplification ratio M is same, and flow measurement scope is big, and amount crystal degree is high；Metering
Table is arranged in bypass, and simple in construction, resistance piece is small, and the loss of flood peak is small, does not influence main conduit flow, and negotiability is big, does not consume
The energy；Not by physical parameters impacts such as temperature, electrical conductivity, viscosity, the aqueduct installation of various calibers, high sensitivity are adapted to；
Manufacture craft is simple, and operation is easy for installation, and Maintenance and Repair workload is small, low cost；Design science, simple in construction, cost is low, peace
Tubulature reason is convenient；Can be the water metering for solving the problems, such as piping transportation water irrigation engineering, to promote the whole nation in management of the use of water
Agricultural water price overall reform, agricultural water overall control, quota management provide technical products and supported, for agricultural water conservation emission reduction, subtract
Active promoting function is played in few agricultural non-point source pollution, will produce huge social benefit, economic benefit and environmental benefit.
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.
In figure, 1, flange, 2, the horizontal segment of Pitot tube, 3, the vertical section of Pitot tube, 4, connecting branch, 5, water meter, 6, survey
Pressure pipe, 7, main pipeline, 8, flange.
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 the structural representation of one preferred embodiment of the utility model, a kind of pipeline Pitot tube in figure
Shunting water meter, main pipeline 7 and measurement branch pipe are provided with, and two ends of main pipeline 7 are provided with flange 1,8, water meter
Connected in the duct by the flange 1,8 at the both ends of main pipeline 7, measurement arms parallel is arranged on the sidepiece of main pipeline 7, measurement branch
The pressure-measuring pipe 6 of the Pitot tube in Guan Youyi opening face flow velocity direction, a connecting branch 4 and an opening vertical flow velocity direction
Form, Pitot tube is made up of a horizontal segment and a rear end vertical section head and the tail connection, and Pitot tube is arranged on the average rate of main pipeline 7
Near point position, the horizontal segment 2 of Pitot tube is located at the inside of main pipeline 7 and fixed at its inwall 0.125D, and D is flow master
The nominal diameter of pipe, the external port of vertical section 3 of Pitot tube are communicated to the external port of pressure-measuring pipe 6 by connecting branch 4, in connection branch
Water meter 5 is also equipped with pipe 4, when the water meter 5 is preferably by the strong Waterwheel-type Impeller Design of anti-blockage capability, is applicable containing few
The water of amount and solid small particles, can be widely applied to the metering of the occasions such as agricultural irrigation water and sewage disposal, anti-blocking performance is excellent
It is different, the winding of silt and weeds in water can be prevented, is a kind of detachable anti-blockage type water meter, is adapted to agricultural irrigation water metering.
A kind of concrete structure scheme that can be realized as the present embodiment is that the caliber of the main pipeline 7 is ￠
200mm, its length are 1000mm, and the caliber for measuring branch pipe takes ￠ 20mm, and the length of the horizontal segment 2 of Pitot tube is 50mm, Pitot
The horizontal segment 2 of pipe uses DN20mm Waterwheel-type water meters away from supervisor inwall 25mm, water meter 5.
In order to improve measurement accuracy, it is preferable that the main pipeline 7 selects the resistance coefficient of inner wall smooth with measurement branch pipe
PVC small, that the loss of flood peak is small is made.
Technical principle of the present utility model：
Pass through water W=∑s Q in a certain cross-section of rivertT,For 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 (distance of the tube wall to pipeline average rate point) about in 0.25R, this is to smooth certainly about between 7-11
Pipeline derives.To rough tube, due to having bigger shear force at tube wall, it will prevent more flow of fluid.It is i.e. certain
Reynolds number, when roughness increases, velocity distribution curve then becomes slightly sharp, and y values may increase.Equally, certain roughness bar
Under part, Reynolds number increase, y values reduce, and in some standards, substitute into (3) formula with n=7, y=0.242R is as mean flow rate point
Position, that is, measure inner-walls of duct be pipeline 0.121D at flow velocity, as mean velocity in sectionWater can be calculated
The flow Q of section.
2. amount water principle
From hydraulics：In the steady flow of aqueduct (main pipeline 7 i.e. of the present utility model) straightway, its streamline
For parallel lines, two cross section being parallel to each other A and B are taken on aqueduct, two cross-section of river A, B mean flow raties are equal,
Two cross-section of river energy equations are：
Hw ' is frictional head loss in AB sections, if A, B distance are shorter, and tube wall is smooth, then hw '=0, i.e. A, B two crosses water
Section gross energy is equal：
Have a little 1 on A sections, put an opening face flow velocity direction Pitot tube, B sections have a little 2,1,2 two point positioned at same
One horizontal plane, head difference will be produced by putting one Open Side Down 6,1,2 liang of pipe of pressure-measuring pipe of vertical flow velocity direction：
From above deriving, it is in when 1 position is located at tube wall 0.121DThen 1,2 liang of Guan Ruo is by connecting branch
Pipe 4 connects, and installs water meter 5 on connecting branch 4, then passes through the flow of connecting branch 4：
Flow through aqueduct total flow
Ratio：
D, d is constant, then M is constant.
Pass through aqueduct total Water
W------ aqueducts cross water inventory within the t periods
Water amount of the w----- water meters 5 within the t periods, i.e. difference of reading.
It is i.e. directly proportional to the water amount of water meter 5 by the water amount of aqueduct, it is unrelated with flow velocity.
By measuring branch pipe watermeter flowing rateIt is smaller, to ensure to have enough flows by measuring branch
Pipe, measurement accuracy is improved, the total ξ of measurement branch pipe should be madeBranchIt is small as far as possible, that is, smooth circular arc bent angle is made, uses inner wall smooth
Material make.
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 (4)
1. a kind of pipeline Pitot tube shunting water meter, it is characterized in that：Including main pipeline (7) and branch pipe is measured, main pipeline (7)
Two ends are provided with flange (1,8), and water meter is connected in the duct by the flange (1,8) at main pipeline (7) both ends, measurement branch
Pipe is set in parallel in the sidepiece of main pipeline (7), Pitot tube of the measurement branch pipe by an opening face flow velocity direction, a connection branch
The pressure-measuring pipe (6) for managing (4) and an opening vertical flow velocity direction is formed, and Pitot tube is by a horizontal segment and a rear end vertical section
Head and the tail connection composition, Pitot tube are arranged near the average rate point position of main pipeline (7), and the horizontal segment (2) of Pitot tube is positioned at supervisor
The inside in road (7) and the fixation at its inwall 0.125D, D are the nominal diameter of flow supervisor, and the vertical section (3) of Pitot tube is outside
Port is communicated to the external port of pressure-measuring pipe (6) by connecting branch (4), and water meter (5) is also equipped with connecting branch (4).
2. a kind of pipeline Pitot tube shunting water meter according to claim 1, it is characterized in that：It is described to be arranged on connection branch
Water meter (5) on pipe (4) selects Waterwheel-type water meter.
3. a kind of pipeline Pitot tube shunting water meter according to claim 2, it is characterized in that：The main pipeline (7)
Caliber is ￠ 200mm, and its length is 1000mm, and the caliber for measuring branch pipe takes ￠ 20mm, and the length of the horizontal segment (2) of Pitot tube is
50mm, it uses DN20mm Waterwheel-type water meters away from supervisor inwall 25mm, water meter (5).
4. a kind of pipeline Pitot tube shunting water meter according to claim 1 or 2 or 3, it is characterized in that：The main pipeline
(7) it is made with measurement branch pipe from the PVC of inner wall smooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720365006.8U CN206670698U (en) | 2017-04-07 | 2017-04-07 | A kind of pipeline Pitot tube shunting water meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720365006.8U CN206670698U (en) | 2017-04-07 | 2017-04-07 | A kind of pipeline Pitot tube shunting water meter |
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| Publication Number | Publication Date |
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| CN206670698U true CN206670698U (en) | 2017-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955790A (en) * | 2018-08-23 | 2018-12-07 | 苏州东剑智能科技有限公司 | A kind of drainage type ultrasonic instrument |
-
2017
- 2017-04-07 CN CN201720365006.8U patent/CN206670698U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108955790A (en) * | 2018-08-23 | 2018-12-07 | 苏州东剑智能科技有限公司 | A kind of drainage type ultrasonic instrument |
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