CN211504262U - Open channel flowmeter for monitoring flow of rectangular channel - Google Patents
Open channel flowmeter for monitoring flow of rectangular channel Download PDFInfo
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- CN211504262U CN211504262U CN202020522071.9U CN202020522071U CN211504262U CN 211504262 U CN211504262 U CN 211504262U CN 202020522071 U CN202020522071 U CN 202020522071U CN 211504262 U CN211504262 U CN 211504262U
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Abstract
The utility model discloses an open channel flowmeter for monitoring the flow of a rectangular channel, which comprises a channel water flow form monitoring device and a flow monitoring controller which are arranged in the rectangular channel; the channel water flow form monitoring device comprises a vertical plate, a water facing side vertical plate and a back water side vertical plate which are connected with the vertical plate; the vertical board on the water side, the vertical board on the back water side and the vertical board form a vertical cylinder with a cross section of an isosceles triangle, the vertical board on the water side and the vertical board on the back water side are provided with filtering holes, a partition board is arranged in the vertical cylinder to separate an inner cavity of the vertical cylinder into an upstream side cylinder cavity and a downstream side cylinder cavity, the upstream side cylinder cavity and the downstream side cylinder cavity are respectively provided with an upstream side vertical pipe and a downstream side vertical pipe, and the filtering holes are formed in the circumferential surface of the upstream side vertical pipe and the. The utility model discloses broken through traditional current surveying method, carried out by monitoring sectional average flow through energy conservation and channel equation of continuity, eliminated the error that traditional current surveying mode transducer energy conversion brought, do not need the parameter to rate, had the advantage that measurement accuracy is high.
Description
Technical Field
The utility model belongs to the technical field of the open channel flow monitoring and specifically relates to an open channel flowmeter for rectangle channel flow monitoring is related to.
Background
The accurate monitoring of the flow of the water delivery open channel is the basis of water conservation in an irrigation area, the current means for monitoring and measuring the flow of the water delivery open channel mainly comprises a flow velocity area method, the core of the method is to monitor the average flow velocity of an overflowing section, and the methods for measuring the flow velocity comprise an electromagnetic method, an ultrasonic wave (time difference method), a Doppler method and a building flow measurement method. The electromagnetic method has the defect that the flow measurement limit of a large section is difficult to break through; the Doppler method is mainly used for measuring the strip flow velocity, and the accuracy is low; the flow is measured by an ultrasonic time difference method, and the adopted multichannel flow measuring equipment has strict requirements on field installation and high cost.
Disclosure of Invention
An object of the utility model is to provide an open channel flowmeter for rectangle channel flow monitoring that measurement accuracy is high, simple to operate.
In order to achieve the above purpose, the utility model adopts the following technical proposal:
the utility model discloses an open channel flowmeter for monitoring the flow of a rectangular channel, which comprises a channel water flow form monitoring device arranged in the rectangular channel and a flow monitoring controller arranged outside the rectangular channel; the channel water flow form monitoring device comprises an adherence vertical plate connected with the side wall of the channel, and a water facing side vertical plate and a back water side vertical plate connected with the adherence vertical plate; the water-facing side vertical plate, the water-backing side vertical plate and the wall-adhering vertical plate form a vertical cylinder with an isosceles triangle-shaped cross section, filter holes for eliminating water flow disturbance are formed in the surfaces of the water-facing side vertical plate and the water-backing side vertical plate, and a base is arranged at the lower cylinder opening of the vertical cylinder; a partition plate is arranged in the vertical cylinder to divide an inner cavity of the vertical cylinder into an upstream side cylinder cavity and a downstream side cylinder cavity, the cross sections of the upstream side cylinder cavity and the downstream side cylinder cavity are right-angled triangles, an upstream side vertical pipe and a downstream side vertical pipe are respectively arranged in the upstream side cylinder cavity and the downstream side cylinder cavity, and the peripheral surfaces of the upstream side vertical pipe and the downstream side vertical pipe are respectively provided with a filtering hole for eliminating water flow disturbance; the base is provided with an upstream side pressure water level monitor and a downstream side pressure water level monitor in an upstream side vertical pipe and a downstream side vertical pipe respectively, control interfaces of the upstream side pressure water level monitor and the downstream side pressure water level monitor are led out from an upper cylinder opening of the vertical cylinder through cables, and the control interfaces are connected with the flow monitoring controller through cables.
The flow monitoring controller includes:
the basic parameter input control module is used for inputting the width of the rectangular channel, the water blocking width of the vertical cylinder and monitoring control parameters and storing the parameters in a memory;
the control module is used for sending a control instruction, controlling the upstream side pressure water level monitor and the downstream side pressure water level monitor to synchronously acquire the cross section water levels of the channels monitored by the upstream side pressure water level monitor and the downstream side pressure water level monitor in a set monitoring time period according to a set acquisition frequency, and calculating the average water level in the set monitoring time period and the area of the overflow cross section of the average water level;
and the instantaneous flow monitoring and calculating module is used for calculating the instantaneous average flow of the monitored section in the set monitoring time period and calculating the average flow of the monitored section in the set monitoring time period.
The filtering holes arranged on the surfaces of the water facing side vertical plate and the back water side vertical plate and the peripheral surfaces of the upper side vertical pipe and the downstream side vertical pipe are rectangular vertical holes.
Openings are respectively arranged on the bottom pipe body walls of the upper and the downstream side vertical pipes, so that the canal water can smoothly enter the upper and the downstream side vertical pipes.
The utility model discloses broken through traditional current surveying method, through installing by monitoring section position department channel rivers form monitoring devices and channel lateral wall effect arouse by the change of monitoring section upper and lower reaches water level, carry out by monitoring section average flow's monitoring and calculation through energy conservation and channel equation of continuity. The method eliminates errors caused by energy conversion of the traditional flow measurement mode energy conversion device, does not need parameter calibration, and has the advantages of high measurement precision and simple and convenient installation and flow measurement.
Drawings
Fig. 1 is a schematic structural view of the device for monitoring water flow form in the open channel of the present invention.
Fig. 2 is an enlarged sectional view taken along line a-a of fig. 1.
Fig. 3 is a schematic structural diagram of the upstream side riser (or the downstream side riser) according to the present invention.
Fig. 4 is a schematic plan view of the channel water flow form monitoring device of the present invention arranged in a rectangular channel.
Fig. 5 is a schematic view of the channel water flow form monitoring device arranged on the vertical surface of the rectangular channel.
Fig. 6 is a block diagram of the circuit control system of the present invention.
Fig. 7 is a flow chart of the flow measurement method of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and the embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1-6, the open channel flowmeter for monitoring the flow of the rectangular channel of the present invention comprises a channel water flow form monitoring device disposed in the rectangular channel and a flow monitoring controller disposed outside the rectangular channel.
The channel water flow form monitoring device comprises an adherence vertical plate 2 connected with the channel side wall 1, a water facing side vertical plate 3 and a back water side vertical plate 4 connected with the adherence vertical plate 2; the water-facing side vertical plate 3, the backwater side vertical plate 4 and the wall-adhering vertical plate 2 form a vertical cylinder with an isosceles triangle-shaped cross section, as shown in fig. 2.
Filter holes 5.1 used for eliminating water flow disturbance are respectively and uniformly distributed on the surfaces of the upstream side vertical plate 3 and the downstream side vertical plate 4, and the filter holes 5.1 are of rectangular vertical hole structures, so that the water flow disturbance is easier to eliminate. A base 6 is arranged at the lower opening of the vertical cylinder; a partition plate 7 is arranged in the vertical cylinder to divide an inner cavity of the vertical cylinder into an upstream side cylinder cavity 8 and a downstream side cylinder cavity 9 with right-angled triangle cross sections, an upstream side vertical pipe 10 and a downstream side vertical pipe 11 are respectively arranged in the upstream side cylinder cavity 8 and the downstream side cylinder cavity 9, filtering holes 5.2 used for eliminating water flow disturbance are respectively formed in the peripheral surfaces of the upstream side vertical pipe 10 and the downstream side vertical pipe 11, and the filtering holes 5.2 are of rectangular vertical hole structures, so that the water flow disturbance is easier to eliminate; the bottom tube body walls of the upstream side vertical tube 10 and the downstream side vertical tube 11 are respectively provided with openings 12 so that the canal water can smoothly enter the upstream side vertical tube 10 and the downstream side vertical tube 11.
An upstream side pressure water level monitor 13 and a downstream side pressure water level monitor 14 are respectively arranged in the upper side vertical pipe 10 and the lower side vertical pipe 11 on the base 6, control interfaces and power interfaces of the upper side pressure water level monitor 13 and the downstream side pressure water level monitor 14 are respectively led out from an upper cylinder opening of the vertical cylinder through cables, and the control interface cables are connected with a flow monitoring controller.
As shown in fig. 6, the flow rate monitoring controller includes: the basic parameter input control module is used for inputting the width of the rectangular channel, the water blocking width of the vertical cylinder and monitoring control parameters (monitoring time period and acquisition frequency) and storing the parameters in the memory; the control module is used for sending a control instruction, controlling the upstream and downstream side pressure water level monitors 13 and 14 to synchronously acquire the cross section water levels of the channels monitored by the upstream and downstream side pressure water level monitors within a set monitoring time period according to a set acquisition frequency, and calculating the average water level within the set monitoring time period and the area of the overflow cross section under the average water level; and the instantaneous flow monitoring and calculating module is used for calculating the average flow of the monitored section within a set monitoring time period.
As shown in fig. 1-7, the flow measuring method of the open channel flowmeter of the present invention comprises the following steps:
s1, constructing the three-section flow measurement environment of the rectangular channel:
an open channel flowmeter is arranged on the channel side wall 1 of a specified monitored section Le in a channel 15, and the steps are as follows:
s1.1, placing a base 6 of a vertical cylinder at the bottom of a channel, overlapping a partition plate 7 in the vertical cylinder with a monitored section Le, fixing an adherence vertical plate 2 with the side wall of the channel, and extending an upper cylinder opening of the vertical cylinder above the channel 15;
s1.2, settingSetting the section where the upstream side vertical edge 16 of the water facing side vertical plate 3 is located as an upstream side monitoring section Ls, and setting the section where the downstream side vertical edge 17 of the water backing side vertical plate 4 is located as a downstream side monitoring section Lx; the upstream side pressure water level monitor 13 is used for a set monitoring period deltatThe water level of the upstream side monitoring section Ls is acquired according to a set acquisition frequency, and the downstream side pressure water level monitor 14 is used for monitoring the set monitoring time interval deltatCollecting the water level of the downstream side monitoring section Lx according to a set collection frequency;
s2, the control module sends out control instructions to control the upstream and downstream side pressure water level monitors 13 and 14 to be in a set monitoring time interval deltatSynchronously acquiring the water level data of the upstream side monitoring section Ls and the water level data of the downstream side monitoring section Lx according to the set acquisition frequency, and calculating the water level data in the set monitoring time interval deltatAverage water level hs data of inner upstream side monitoring section Ls, average water level hx data of downstream side monitoring section Lx, and average water passing area of monitored section Le
Data, average water passing area of upstream side monitoring section Ls
Data, average water passing area of downstream side monitoring section Lx
Data; wherein the average water passing area of the monitored cross section Le
Equal to the average water passing area of the upstream side monitoring section Ls
Subtracting the vertical cylinder water-blocking area below the average water level hs of the upstream monitoring section Ls (the vertical cylinder water-blocking area is the projection area of the vertical plate 3 on the water-facing side below the average water level hs of the monitoring section Ls and vertical to the channel axis);
s3, calculating the overflow of the monitored section Le:
the control module obtains the average water level hs data, the average water level hx data and the average water passing area
Data, mean water flow area
Data and mean water flow area
The data is output to an instantaneous flow monitoring and calculating module which deduces delta based on the parameters according to the three-section energy conservation principletThe time interval average flow calculation method comprises the following steps:
according to the principle of energy conservation of three sections, the instantaneous average total energy E of the upstream side monitoring section LsLSSubtracting the instantaneous average total energy E of the downstream monitoring section LxLxEqual to the mean momentum change Δ E of the monitored section LeLxWherein:
simultaneously according to channel water flow continuous equation Qs=Qx=QeComprises the following steps:
thereby obtaining
QsUpstream side monitoring section Ls at ΔtAverage flow over a period of time;
Qxdownstream side monitoring profile Lx at ΔtAverage flow over a period of time;
Qethe monitored cross section Le is at deltatAverage flow over a period of time;
m : Δtthe average mass of water flow flowing through three sections of Ls, Le and Lx in a time interval;
Vsupstream side monitoring section Ls at ΔtAverage flow rate over a period of time;
Vxdownstream side monitoring profile Lx at ΔtAverage flow rate over a period of time;
Vethe monitored cross section Le is at deltatAverage flow rate over a period of time;
g-acceleration of gravity.
In S2, the set monitoring period Δ t is selected between 5 seconds and 60 seconds, the collection frequency is 2-3 times per second, and the average water level hs data of the upstream side monitoring section Ls and the average water level hx data of the downstream side monitoring section Lx are calculated once every monitoring period t; when calculating the average water level hs data and the average water level hx data, a maximum value and a minimum value are respectively removed and then an average value is obtained.
Claims (4)
1. The utility model provides an open channel flowmeter for monitoring of rectangle channel flow which characterized in that: the device comprises a channel water flow form monitoring device arranged in a rectangular channel and a flow monitoring controller arranged outside the rectangular channel; the channel water flow form monitoring device comprises an adherence vertical plate connected with the side wall of the channel, and a water facing side vertical plate and a back water side vertical plate connected with the adherence vertical plate; the water-facing side vertical plate, the water-backing side vertical plate and the wall-adhering vertical plate form a vertical cylinder with an isosceles triangle-shaped cross section, filter holes for eliminating water flow disturbance are formed in the surfaces of the water-facing side vertical plate and the water-backing side vertical plate, and a base is arranged at the lower cylinder opening of the vertical cylinder; a partition plate is arranged in the vertical cylinder to divide an inner cavity of the vertical cylinder into an upstream side cylinder cavity and a downstream side cylinder cavity, the cross sections of the upstream side cylinder cavity and the downstream side cylinder cavity are right-angled triangles, an upstream side vertical pipe and a downstream side vertical pipe are respectively arranged in the upstream side cylinder cavity and the downstream side cylinder cavity, and the peripheral surfaces of the upstream side vertical pipe and the downstream side vertical pipe are respectively provided with a filtering hole for eliminating water flow disturbance; the base is provided with an upstream side pressure water level monitor and a downstream side pressure water level monitor in an upstream side vertical pipe and a downstream side vertical pipe respectively, control interfaces of the upstream side pressure water level monitor and the downstream side pressure water level monitor are led out from an upper cylinder opening of the vertical cylinder through cables, and the control interfaces are connected with the flow monitoring controller through cables.
2. The open channel flow meter for rectangular channel flow monitoring of claim 1, wherein: the flow monitoring controller includes:
the basic parameter input control module is used for inputting the width of the rectangular channel, the water blocking width of the vertical cylinder and monitoring control parameters and storing the parameters in a memory;
the control module is used for sending a control instruction, controlling the upstream side pressure water level monitor and the downstream side pressure water level monitor to synchronously acquire the cross section water levels of the channels monitored by the upstream side pressure water level monitor and the downstream side pressure water level monitor in a set monitoring time period according to a set acquisition frequency, and calculating the average water level in the set monitoring time period and the area of the overflow cross section of the average water level;
and the instantaneous flow monitoring and calculating module is used for calculating the instantaneous average flow of the monitored section in the set monitoring time period and calculating the average flow of the monitored section in the set monitoring time period.
3. The open channel flow meter for rectangular channel flow monitoring of claim 1 or 2, wherein: the filtering holes arranged on the surfaces of the water facing side vertical plate and the back water side vertical plate and the peripheral surfaces of the upper side vertical pipe and the downstream side vertical pipe are rectangular vertical holes.
4. The open channel flow meter for rectangular channel flow monitoring of claim 1 or 2, wherein: openings are respectively arranged on the bottom pipe body walls of the upper and the downstream side vertical pipes, so that the canal water can smoothly enter the upper and the downstream side vertical pipes.
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| CN202020522071.9U CN211504262U (en) | 2020-04-10 | 2020-04-10 | Open channel flowmeter for monitoring flow of rectangular channel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543903A (en) * | 2022-01-28 | 2022-05-27 | 水利部水土保持监测中心 | Portable torque type flow measuring device and flow measuring method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114543903A (en) * | 2022-01-28 | 2022-05-27 | 水利部水土保持监测中心 | Portable torque type flow measuring device and flow measuring method |
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