CN210464571U - Channel flow measuring equipment - Google Patents
Channel flow measuring equipment Download PDFInfo
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- CN210464571U CN210464571U CN201921825324.3U CN201921825324U CN210464571U CN 210464571 U CN210464571 U CN 210464571U CN 201921825324 U CN201921825324 U CN 201921825324U CN 210464571 U CN210464571 U CN 210464571U
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- doppler
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Abstract
The embodiment of the utility model provides a channel flow measuring equipment measures the velocity of flow through the Doppler method, adopts Doppler signal processor to carry out the analysis to the Doppler signal of ultrasonic probe transmission and calculates and obtain the velocity of flow, sends the velocity of flow for microcontroller, and microcontroller calculates instantaneous flow, divides the computational process of instantaneous flow for Doppler signal processor and microcontroller two like this and calculates, has shortened instantaneous flow's calculation cycle, and then makes the flow calculation in every calculation cycle more accurate. The number of the further Doppler method probe pairs is multiple, and each Doppler probe pair is arranged at different heights in the water measuring tank. The Doppler probe pairs are arranged at different heights, so that the velocity distribution rule of the fluid in the vertical direction can be measured, and the obtained instantaneous flow is more accurate.
Description
Technical Field
The utility model relates to a water conservancy technical field, more specifically say, relate to channel flow measuring equipment.
Background
The flow measurement of the channel comprises measuring modes such as a water measuring weir, a water measuring tank and the like. A weir, a building specifically constructed for flow testing, may be used to control the upstream and measured flow. The water measuring tank is a water measuring facility which is formed by building a tank-shaped building with a narrowed water flow section on a channel and an open tank and forming critical flow to measure the flow. The water measuring tank measures flow state distribution in the tank body through the ultrasonic probe, so that higher flow metering precision can be obtained. At present, the water measuring tank has the following problems in the application process, the time period for calculating the instantaneous flow is long, and the calculated flow error is large when the speed of the fluid changes fast.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a channel flow measurement equipment wants to shorten the calculation cycle of instantaneous flow, and then improves the accuracy of flow calculation.
In order to achieve the above object, the following solutions are proposed:
the utility model provides a channel flow measuring equipment, include:
a water measuring tank;
the Doppler method probe pair is arranged in the water measuring tank and comprises a first ultrasonic probe and a second ultrasonic probe;
a Doppler signal conditioning circuit connected with the second ultrasonic probe;
the analog-to-digital converter is connected with the Doppler signal conditioning circuit;
a Doppler signal processor connected with the analog-to-digital converter;
a microcontroller connected to the doppler signal processor;
the receiving and transmitting circuit is connected with the first ultrasonic probe and is also connected with the microcontroller; and the number of the first and second groups,
a water level gauge and a clock management unit connected with the microcontroller;
and the crystal oscillator is connected with the clock management unit.
The calculation process of the instantaneous flow is divided into a Doppler signal processor and a microcontroller for calculation, so that the calculation period of the instantaneous flow is shortened, and the flow calculation in each calculation period is more accurate.
Optionally, the channel flow measuring device further includes:
the time difference method probe pair is arranged in the water measuring tank and comprises a third ultrasonic probe and a fourth ultrasonic probe, and the third ultrasonic probe and the fourth ultrasonic probe are both connected with the receiving and transmitting circuit; and the combination of (a) and (b),
and the time delay processing circuit is respectively connected with the microcontroller and the receiving and transmitting circuit.
For purer fluid, the flow can be measured by a time difference method, and for fluid with higher impurity content, the flow velocity can be measured by a Doppler method, so that the channel flow measuring equipment is suitable for various fluids, and the applicability of the channel flow measuring equipment is improved.
Optionally, the third ultrasonic probe and the first ultrasonic probe are the same ultrasonic probe. The same ultrasonic probe is used as the ultrasonic probe for transmitting the pulse signal in the Doppler method probe pair and also used as the ultrasonic probe for transmitting the pulse signal in the time difference method probe pair, so that the use number of the ultrasonic probes is reduced, and the cost is reduced.
Optionally, the number of the doppler method probe pairs is multiple, and each doppler probe pair is installed in different areas of the same height in the water measuring tank. The obtained flow velocity is more accurate by measuring the flow velocities of different areas at the same height and calculating the average value.
Optionally, the number of the doppler method probe pairs is multiple, and each doppler probe pair is installed at a different height in the water measuring tank. The Doppler probe pairs are arranged at different heights, so that the velocity distribution rule of the fluid in the vertical direction can be measured, the obtained instantaneous flow is more accurate,
optionally, the distance between the doppler probes at the lower part of the water measuring tank is smaller than the distance between the doppler probes at the upper part of the water measuring tank.
Optionally, the water measuring tank includes: the Doppler flow measurement device comprises a water inlet flaring, a flow stabilization section, a flow measurement section and an assembly interface, wherein the Doppler method probe pair is arranged on the flow measurement section.
Optionally, the water measuring tank is made of the following materials: an aluminum alloy.
Optionally, the channel flow measuring device further includes: and the storage unit is connected with the microcontroller.
Optionally, the channel flow measuring device further includes: and the wireless transmission unit and/or the RS485 communication unit are connected with the microcontroller.
Compared with the prior art, the technical scheme of the utility model have following advantage:
according to the channel flow measuring equipment provided by the technical scheme, the flow velocity is measured by a Doppler method, the Doppler signal transmitted by the ultrasonic probe is analyzed and calculated by the Doppler signal processor to obtain the flow velocity, the flow velocity is sent to the microcontroller, and the microcontroller calculates the instantaneous flow, so that the calculation process of the instantaneous flow is divided into the Doppler signal processor and the microcontroller for calculation, the calculation period of the instantaneous flow is shortened, and the flow calculation in each calculation period is more accurate.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a channel flow measuring device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another channel flow measuring device provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of an arrangement of ultrasonic probes in a horizontal plane according to an embodiment of the present invention;
fig. 4 is a schematic view of an arrangement of an ultrasonic probe in another horizontal plane according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an arrangement of ultrasonic probes in a vertical plane according to an embodiment of the present invention;
fig. 6 is a schematic view of a water measuring tank according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another channel flow measuring device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
An embodiment of the utility model provides a channel flow measuring equipment, see fig. 1, this channel flow measuring equipment, include: the system comprises a water measuring tank 11, a first ultrasonic probe 12, a second ultrasonic probe 13, a Doppler signal conditioning circuit 14, an analog-to-digital converter 15, a Doppler signal processor 16, a microcontroller 17, a receiving and transmitting circuit 18, a water level gauge 19, a clock management unit 20 and a crystal oscillator 21.
The first ultrasonic probe 12 and the second ultrasonic probe 13 form a Doppler probe pair and are arranged in the water measuring tank 11. The microcontroller 17 is connected to the first ultrasound probe 12 via a receiving and transmitting circuit 18. The microcontroller 17 is connected to the second ultrasound probe 13 via a doppler signal processor 16, an analog-to-digital converter 15 and a doppler signal conditioning circuit 14 in that order. A water level gauge 19 and a clock management unit 20 connected to the microcontroller 17, respectively. The clock management unit 20 is connected to the crystal oscillator 21. The clock management unit 20 and the crystal oscillator 21 mainly perform clock matching for the microcontroller 17 and the doppler signal processor 16, so as to meet the clock requirement of the system.
The Doppler method for measuring the flow rate is suitable for the fluid with high impurity content. The principle that the channel flow measurement device provided by the embodiment measures flow by using a doppler method specifically comprises the following steps: the microcontroller 17 transmits the ultrasound pulse signal at the first ultrasound probe 12 via the receiving and transmitting circuit 18. The ultrasonic pulse signal emitted by the first ultrasonic probe 12 enters the moving fluid and is scattered into the second ultrasonic probe 13 by particles or bubbles or the like moving with the fluid, which can scatter the ultrasonic signal. The transmission signal and the reception signal are linked by the doppler effect, and the second ultrasonic probe 13 transmits the received doppler signal of the left area to the doppler signal conditioning circuit 14. The doppler signal is amplified and filtered by the doppler signal conditioning circuit 14, and then sent to the analog-to-digital converter 15. The analog signal is converted into a digital signal by the analog-to-digital converter 15 and then sent to the doppler signal processor 16. The Doppler signal processor 16 conducts FFT (fast Fourier transform) processing to obtain the frequency of flow velocity, and therefore the flow velocity of the left area is calculated, the Doppler signal processor 16 sends the calculated flow velocity to the microcontroller 17, the water level meter 19 sends the collected water surface height to the microcontroller 17, the microcontroller 17 measures the instantaneous flow of the water cross section by adopting a velocity area method, and the accumulated flow is obtained by integrating the instantaneous flow.
The embodiment of the utility model provides another kind of channel flow measuring equipment, see fig. 2, this channel flow measuring equipment still includes for the channel flow measuring equipment that fig. 1 shows: a third ultrasound probe 22, a fourth ultrasound probe 23 and a time delay processing circuit 24. The third ultrasonic probe 22 and the fourth ultrasonic probe 23 form a pair of time-difference probes, and are also arranged in the water measuring tank 11. The third ultrasonic probe 22 and the fourth ultrasonic probe 23 are both connected to the receiving and transmitting circuit 18. The time delay processing circuit 24 is connected to the microcontroller 17 and the receiving and transmitting circuit 18, respectively. The channel flow measuring device provided by the embodiment can also measure the flow velocity by a time difference method.
The principle that channel flow measuring equipment provided by the embodiment measures flow velocity through a time difference method specifically comprises the following steps: the microcontroller 17 transmits the ultrasound pulse signal at the third ultrasound probe 22 via the receiving and transmitting circuit 18. The ultrasonic pulse signal emitted by the third ultrasonic probe 22 enters the fourth ultrasonic probe 23 through the moving fluid. The fourth ultrasonic probe 23 receives the pulse signal and then sends the pulse signal to the time delay processing circuit 24 through the receiving and transmitting circuit 18. The time delay processing circuit 24 obtains the flight time of the pulse signal and sends the flight time to the microcontroller 17. After receiving the time of flight, the microcontroller 17 transmits an ultrasonic pulse signal at the fourth ultrasonic probe 23 through the receiving and transmitting circuit 18. The ultrasonic pulse signal emitted by the fourth ultrasonic probe 23 enters the third ultrasonic probe 22 through the fluid in motion. The third ultrasonic probe 22 receives the pulse signal and then sends the pulse signal to the time delay processing circuit 24 through the receiving and transmitting circuit 18. The time delay processing circuit 24 obtains the flight time of the pulse signal and sends the flight time to the microcontroller 17. The microcontroller 17 calculates the flow rate from the two time-of-flight calculations. The water level gauge 19 sends the collected water level to the microcontroller 17. The microcontroller 17 will measure the instantaneous flow of the water section using the velocity area method and obtain the cumulative flow by integrating the instantaneous flow.
When the channel flow measuring equipment measures the flow velocity by adopting a time difference method, the time of the time difference method is calculated by adopting an external time delay processing circuit 24, and the calculated flight time is sent to the microcontroller 17. The calculation process of the instantaneous flow is divided into the time delay processing circuit 24 and the microcontroller 17 for calculation, so that the calculation period of the instantaneous flow is shortened, and the flow calculation in each calculation period is more accurate.
In a particular embodiment, the third ultrasound probe 22 and the first ultrasound probe 12 are the same ultrasound probe, the arrangement of the three ultrasound probes being seen in fig. 3. The same ultrasonic probe is used as the ultrasonic probe for transmitting the pulse signal in the Doppler method probe pair and also used as the ultrasonic probe for transmitting the pulse signal in the time difference method probe pair, so that the use number of the ultrasonic probes is reduced, and the cost is reduced.
In some embodiments, the number of doppler probe pairs is multiple, each doppler probe pair being mounted in a different area at the same height in the water tank 11, and fig. 4 shows two doppler probe pairs. The obtained flow velocity is more accurate by measuring the flow velocities of different areas at the same height and calculating the average value. The flow velocity distribution condition on the plane can be measured in more detail by measuring the flow velocity of different areas on one water flow plane according to different flow states such as vortex, oblique flow, backflow and the like. And the unreasonable calculated flow rate can be removed, and a reasonable flow rate is selected to calculate an average value.
In some embodiments, there are a plurality of doppler probe pairs, each mounted at a different height within the water tank 11, and four doppler probe pairs are shown with reference to fig. 5. All doppler probe pairs were divided into 4 layers, layer 1 at height 1/8H. Layer 2 is at height 1/4H. Layer 3 is at height 1/2H. Layer 4 is at height 7/8H. A water level gauge 19 is located at the very middle of the top of the water tank 11. In most cases, the water flow passing through the box body is not full of pipes, so that the ultrasonic probes are densely distributed at the lower part of the box body, and the utilization rate of the ultrasonic probes is improved. The Doppler probe pairs are arranged at different heights, so that the water flow distribution rule in the vertical direction can be measured, the obtained instantaneous flow is more accurate,
referring to fig. 6, the water measuring tank 11 includes: water inlet flaring, a steady flow section, a flow measuring section and an assembly interface. The Doppler method probe pair and the time difference method probe pair are both arranged on the flow measuring section of the water measuring tank 11. And (4) water inlet flaring, and eddy reduction is carried out on water flow entering the box body. The water flow fully flows in the steady flow section, and a stable flow state is obtained in the flow measurement section. The assembly interface ensures good assembly of the measuring device, the gate and other equipment. In one embodiment, the water-measuring tank 11 is made of aluminum alloy, and the water level gauge 19 is an ultrasonic water level gauge.
Referring to fig. 7, the channel flow rate measuring apparatus further includes: a storage unit 24 connected with the microcontroller 17, a wireless transmission unit 25 and an RS485 communication unit 26. The storage unit 24 is used to expand the storage space of the microcontroller 17, and meet the storage requirements of system variables, logs and the like. The wireless transmission unit 25 meets the requirements of wireless transmission and debugging of the system, and can be remotely controlled and debugged. The RS485 communication unit 26 adopts a corresponding communication protocol, and meets the requirement of wired remote transmission.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the present specification, the emphasis points of the embodiments are different from those of the other embodiments, and the same and similar parts among the embodiments may be referred to each other.
The above description of the disclosed embodiments of the invention enables one skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An apparatus for channel flow measurement, comprising:
a water measuring tank;
the Doppler method probe pair is arranged in the water measuring tank and comprises a first ultrasonic probe and a second ultrasonic probe;
a Doppler signal conditioning circuit connected with the second ultrasonic probe;
the analog-to-digital converter is connected with the Doppler signal conditioning circuit;
a Doppler signal processor connected with the analog-to-digital converter;
a microcontroller connected to the doppler signal processor;
the receiving and transmitting circuit is connected with the first ultrasonic probe and is also connected with the microcontroller; and the number of the first and second groups,
a water level gauge and a clock management unit connected with the microcontroller;
and the crystal oscillator is connected with the clock management unit.
2. The channel flow measuring apparatus of claim 1, further comprising:
the time difference method probe pair is arranged in the water measuring tank and comprises a third ultrasonic probe and a fourth ultrasonic probe, and the third ultrasonic probe and the fourth ultrasonic probe are both connected with the receiving and transmitting circuit; and the combination of (a) and (b),
and the time delay processing circuit is respectively connected with the microcontroller and the receiving and transmitting circuit.
3. The channel flow measurement apparatus of claim 2, wherein the third ultrasonic probe and the first ultrasonic probe are the same ultrasonic probe.
4. The channel flow measuring apparatus of claim 1, wherein said doppler probe pair is plural in number, each said doppler probe pair being mounted in different areas of the same elevation within said water measurement tank.
5. The channel flow measuring apparatus of claim 1, wherein said doppler probe pairs are plural in number, each said doppler probe pair being mounted at a different height within said water measurement tank.
6. The channel flow measurement apparatus of claim 5, wherein the spacing between the Doppler probes at the lower portion of the water meter tank is less than the spacing between the Doppler probes at the upper portion of the water meter tank.
7. The channel flow measuring apparatus of claim 1, wherein the waterbox comprises:
the Doppler flow measurement device comprises a water inlet flaring, a flow stabilization section, a flow measurement section and an assembly interface, wherein the Doppler method probe pair is arranged on the flow measurement section.
8. The channel flow measurement apparatus of claim 7, wherein the waterbox is made of:
an aluminum alloy.
9. The channel flow measuring apparatus of claim 1, further comprising:
and the storage unit is connected with the microcontroller.
10. The channel flow measuring apparatus according to any one of claims 1 to 9, further comprising:
and the wireless transmission unit and/or the RS485 communication unit are connected with the microcontroller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921825324.3U CN210464571U (en) | 2019-10-28 | 2019-10-28 | Channel flow measuring equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921825324.3U CN210464571U (en) | 2019-10-28 | 2019-10-28 | Channel flow measuring equipment |
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| CN210464571U true CN210464571U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110567543A (en) * | 2019-10-28 | 2019-12-13 | 北京奥特美克科技股份有限公司 | channel flow measuring equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110567543A (en) * | 2019-10-28 | 2019-12-13 | 北京奥特美克科技股份有限公司 | channel flow measuring equipment |
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