CN211317447U - Small-size open channel arbitrary water level velocity of flow detection device - Google Patents
Small-size open channel arbitrary water level velocity of flow detection device Download PDFInfo
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Abstract
A small-sized open channel arbitrary water level flow velocity detection device is characterized in that a cross-shaped integral frame structure is formed by a vertical longitudinal electronic water gauge and a transverse metal plate; one side of electron water gauge is provided with one and erects the row of probe, and the opposite side is fixed with a lead screw II and step motor I extends in the surface of water, the intermediate position of lead screw II is provided with a horizontal metal sheet, and through the step motor II of a fixed key fixedly connected with lead screw I and end on the horizontal metal sheet, the intermediate position is provided with a current meter, constitutes arbitrary water level velocity of flow detection device, this device simple structure, simple to operate, the current measurement precision is high, is particularly suitable for the arbitrary water level velocity of flow detection of small-size civilian channel.
Description
Technical Field
The invention relates to an open channel water level flow measuring device, in particular to a flow velocity detection device for standard small-sized open channel water level flow velocity.
Background
An ADCP Doppler current meter is the most commonly used current meter for measuring the current flow rate internationally in recent years, the principle of measuring the flow rate and the flow of a water body is to use a great amount of microorganisms and suspended matters existing in the water body as a medium for reflecting sound waves, when the water body moves relative to a measuring instrument, the detected sound waves reflected by the suspended matters in the water body generate Doppler frequency offset due to Doppler effect, the Doppler frequency offset reflects the relative speed of the water bottom, the water body and the measuring instrument, a receiving device only needs to receive echo waves of the detected sound waves and process the echo waves to obtain Doppler components, then the speed of the water body and the water bottom relative to the measuring instrument is calculated, and finally, the flow rate information can be calculated, generally, ADCP can play a role in measuring flow in some great rivers, but is not suitable for the current situation of irrigation district open channels in China, because the irrigation district open channels all belong to small standard channels, it is not necessary to load ADCP, and ADCP is better developed by combining high technology, and although it has high efficiency and accuracy, it is expensive.
The electric wave flow rate meter consists of detector, data measuring system, power source, etc. and has the working principle of emitting electromagnetic wave to water surface and receiving the reflected electromagnetic wave from water surface, and the frequency difference between the emitted electromagnetic wave and the reflected electromagnetic wave is known based on Doppler effect and is then determined by formula
Calculating the flow velocity of the water surface, wherein V represents the flow velocity of the water surface,
which represents the frequency at which the electromagnetic waves are emitted,
indicating the doppler frequency of the echo, C the propagation velocity of the electromagnetic wave in air,
the method is mainly suitable for measuring the water surface flow velocity of the flood, and is used in a heavy rain day to avoid the use in the heavy rain day and prevent the reflection of electromagnetic waves from being influenced by the heavy rain, thereby reducing the flow measurement precision.
Disclosure of Invention
The invention aims to solve the specific technical problem of directly measuring the channel flow through an electronic water gauge and a flow meter and provides a small-sized flow rate detection device for any water level of an open channel.
The invention adopts the following technical scheme to achieve the purpose of the invention.
A small-sized open channel arbitrary water level flow velocity detection device comprises a stepping motor, an electronic water gauge, a screw rod, a metal plate, a fixed key and a flow velocity meter; the method is characterized in that:
the water level flow velocity detection device is of a cross-shaped integral frame structure formed by a vertical longitudinal electronic water gauge and a transverse metal plate; one side of electron water gauge is provided with a vertical probe, and the opposite side is fixed with a lead screw II and extends in the surface of water with step motor I, the intermediate position of lead screw II is provided with a horizontal metal sheet, and through the step motor II of a fixed key fixedly connected with lead screw I and end on the horizontal metal sheet, the intermediate position is provided with a current meter, constitutes arbitrary water level velocity of flow detection device.
The water level flow velocity detection method of the water level flow velocity detection device is characterized in that an electronic water gauge is vertically placed in water to measure the water level, one end of the electronic water gauge extends out of the water level, a transverse metal plate is adjusted according to the water level to submerge the electronic water gauge in the water, a power supply is switched on, and the electronic water gauge measures the water level value; stretch into the average velocity of flow of a certain section of aquatic measurement with the current meter, select for use portable Doppler current meter, utilize the time difference method, gather instantaneous velocity of flow information, specific formula is:
d-the vertical distance between the two probes; m is the linear propagation times of the sound beam in water; theta-the angle between the sound beam and the water flow direction;
-the transit time of the acoustic beam in the positive direction of the water flow;
-the travel time of the acoustic beam in the direction of the water flow reversal; measuring flow rate and liquid level, i.e. using formula
And calculating the flow of the channel.
The technical scheme is implemented to realize that the flow in different water depths of a small channel and the flow in different width positions of the same cross section can be measured on the premise of not moving the flow measuring device.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
FIG. 2 is a schematic diagram of the operation of the apparatus of the present invention.
In the figure: 1-a stepping motor I; 2-an electronic water gauge; 3-a screw rod I; 4-a fixed bond; 5-a probe; 6-screw mandrel II; 7-a flow meter; 8-step motor II; 9-metal plate.
Detailed Description
The following provides a further detailed description of specific embodiments of the present invention.
As shown in fig. 1 and fig. 2, the device for detecting the flow rate of any water level of the small open channel comprises a stepping motor I1, an electronic water gauge 2, a screw rod I3, a fixed key 4, a probe 5, a screw rod II 6, a flow meter 7, a stepping motor II 8 and a metal plate 9, wherein the water level flow rate detection device is of a cross-shaped integral frame structure formed by a vertical longitudinal electronic water gauge 2 and a transverse metal plate 9; one side of this electron water gauge 2 is provided with a vertical probe 5, and the opposite side is fixed with a lead screw II 6 and its step motor I1 and extends in the surface of water, the intermediate position of lead screw II 6 is provided with a horizontal metal sheet 9, and through the step motor II 8 of fixed key 4 fixedly connected with a lead screw I3 and end on the horizontal metal sheet 9, the intermediate position is provided with a current meter 7, constitutes arbitrary water level velocity of flow detection device.
When the device is used for measuring the flow of a channel, the electronic water gauge 2 is vertically placed in water to measure the water level, one end of the electronic water gauge extends out of the water level, the transverse metal plate 9 is adjusted according to the water level to be submerged in the water, the power supply is switched on, and the water level value is measured through the sensor; control step motor I with the remote controller and make horizontal metal sheet reciprocate when certain degree of depth, utilize step motor II to make the current meter horizontal slip on the horizontal metal sheet to certain section position, measure the average velocity of flow of certain section, the device chooses portable Doppler current meter for use, and the principle is the time difference method, gathers instantaneous velocity of flow information, and specific formula is:
in the formula: d-the vertical distance between the two probes; m is the linear propagation times of the sound beam in water; theta-the angle between the sound beam and the water flow direction;
-the transit time of the acoustic beam in the positive direction of the water flow;
-the travel time of the acoustic beam in the direction of the water flow reversal; after the flow rate and the liquid level are measured, the formula can be used
And calculating the flow of the channel.
Example 1
The implementation of the water level flow velocity method-based arbitrary water level flow velocity detection device for the small channel comprises the following steps:
(1) the device includes the electron water gauge, two step motor, two lead screws, a current meter, with the vertical aquatic of putting into of electron water gauge, the surface of water is extended to one end, a lead screw is fixed to the adjacent side of electron water gauge, a step motor is equipped with to the upper end of pole, there is a horizontal metal sheet on this vertical lead screw, a same fixed lead screw on the board, a step motor is also equipped with to the one end of lead screw, simultaneously still have a current meter on this horizontal lead screw, two step motor will drive horizontal metal sheet and reciprocate and the current meter is removed from the side.
(2) After the device is placed in a channel, the transverse metal plate is adjusted according to the water level to submerge the device in water, and after all the devices are ready, the power supply is switched on.
(3) The stepping motor is controlled by a remote controller, and the current meter is adjusted to a desired position, so that the purpose of detecting the flow rate of any water level in a small channel is achieved.
The device's current surveying principle is that electron water gauge measures the water level, and the current meter need stretch into the aquatic and measure a certain sectional average velocity of flow, this for convenience chooses portable doppler current meter for use, utilizes the time difference method, can gather instantaneous velocity of flow information, and the time difference method utilizes the time difference to calculate the velocity of flow as the name suggests, and specific formula is as follows:
in the formula: d-the vertical distance between the two probes; m is the linear propagation times of the sound beam in water; theta-the angle between the sound beam and the water flow direction;
-the transit time of the acoustic beam in the positive direction of the water flow;
-the travel time of the acoustic beam in the direction of the water flow reversal; measuring the flow rate and liquid level, i.e. using the formula
The flow of the channel is calculated, so that the purpose of detecting the flow velocity of any water level is achieved.
Claims (1)
1. A small-sized open channel arbitrary water level flow velocity detection device comprises a stepping motor, an electronic water gauge, a screw rod, a metal plate, a fixed key and a flow velocity meter; the method is characterized in that:
the water level and flow velocity detection device is of a cross-shaped integral frame structure formed by a vertical longitudinal electronic water gauge (2) and a transverse metal plate (9); one side of electron water gauge (2) is provided with one and erects row probe (5), and the opposite side is fixed with lead screw II (6) and step motor I (1) extends in the surface of water, the intermediate position of lead screw II (6) is provided with a horizontal metal sheet (9), and through fixed key (4) fixedly connected with lead screw I (3) and step motor II (8) of end on horizontal metal sheet (9), the intermediate position is provided with a current meter (7), constitutes arbitrary water level velocity of flow detection device.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113623002A (en) * | 2021-08-04 | 2021-11-09 | 安徽理工大学 | Flood disaster early warning system and method for subway station hall and tunnel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113623002A (en) * | 2021-08-04 | 2021-11-09 | 安徽理工大学 | Flood disaster early warning system and method for subway station hall and tunnel |
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