Flow measuring system

Abstract

The utility model provides a flow measuring system, which relates to the technical field of water flow measurement, and comprises an up-flow bank, a radar water level gauge and a mounting structure, the up-flow bank is arranged on the bottom surface of a channel, the side wall of the up-flow bank is attached to the side wall of the channel, and the radar water level gauge is arranged in the up-flow bank. The flow rising ridge is provided with a first slope surface which is higher than the bottom surface of the channel and is gradually reduced in height along the water flow direction; the radar water level gauge is used for measuring the water flow depth on the first slope surface; the radar water level gauge is arranged above the first slope surface through the mounting structure; according to the utility model, the flow rising ridge is arranged on the bottom surface of the channel, so that the flow velocity of water flowing through the first slope surface on the flow rising ridge is increased, sediment in the water flow is prevented from depositing on the first slope surface, the water depth measured value measured by the radar water level gauge is the actual water depth value, and the accuracy of the water flow calculated according to the water depth measured value is further ensured.

Description

Technical Field

[0001] This utility model relates to the field of water flow measurement technology, and in particular to a flow measurement system. Background Technology

[0002] Open channel flow measurement is an effective measure for water conservation, improving irrigation quality and efficiency in irrigation districts. It is an important means of accurately diverting, conveying, distributing, and irrigating water during the implementation of water use plans, and it is also a major basis for determining and collecting water fees. Traditional flow measurement methods include using basic water gauges or measuring ropes to obtain water level data. The entire measurement process is cumbersome, time-consuming, and labor-intensive, and is easily affected by human factors, resulting in large reading errors. With the advancement of technology, many information-based flow measurement methods have emerged, such as using radar water level gauges for flow measurement.

[0003] In some irrigation areas in China, the silt content in irrigation water is extremely high during flood season, leading to the accumulation of large amounts of silt at the bottom of the channels. This causes significant deviations in the flow measurement results of radar water level gauges.

[0004] Therefore, a new flow measurement scheme is urgently needed to solve the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to provide a flow measurement system to solve the problems existing in the prior art. By setting a flow riser on the bottom of the channel, the flow velocity of the water flowing through the first slope of the flow riser is increased, avoiding the deposition of silt in the water on the first slope. The water depth measured by the radar water level gauge is the actual water depth, thereby ensuring the accuracy of the flow rate calculated based on the water depth measurement.

[0006] To achieve the above objectives, this utility model provides the following solution:

[0007] A flow measurement system includes a riser, a radar level gauge, and an installation structure. The riser is disposed on the bottom surface of a channel, and its sidewalls are abutted against the sidewalls of the channel. The riser has a first slope that is higher than the bottom surface of the channel and gradually decreases in height along the flow direction. The radar level gauge is used to measure the water depth on the first slope. The installation structure positions the radar level gauge above the first slope.

[0008] As one embodiment, the riser also has a second slope connected to the first slope, and the height of the second slope gradually increases along the water flow direction.

[0009] As one implementation, the length of the second slope is less than the length of the first slope along the direction of water flow.

[0010] As one embodiment, the mounting structure includes a bracket spanning across the channel, and the radar level gauge is fixed to the bracket.

[0011] As one embodiment, the installation structure includes a bracket spanning across the channel, a track arranged within the bracket along the span direction, and a self-propelled device for fixing the radar level gauge on the track.

[0012] As one embodiment, a measuring bridge is also included, which is disposed across the channel and adjacent to the support.

[0013] As one implementation method, guardrails are provided on both sides of the measuring bridge.

[0014] As one embodiment, it also includes bases disposed on both sides of the channel, with both ends of the bracket and both ends of the measuring bridge fixed on the bases.

[0015] This utility model also provides a flow measurement method based on the above-mentioned flow measurement system, including the following steps: setting up a flow riser on the bottom surface of the channel, the flow velocity of the water increases when it flows through the first slope of the flow riser, and no sediment can be deposited on the first slope; setting up a radar water level gauge above the first slope to measure the water depth on the first slope and calculate the flow rate of the channel.

[0016] This utility model has the following technical advantages over the prior art:

[0017] This invention increases the flow velocity of water flowing over the first slope of the channel by setting a riser on the bottom surface of the channel, thus preventing the deposition of silt in the water on the first slope. The water depth measured by the radar water level gauge is the actual water depth, thereby ensuring the accuracy of the water flow rate calculated based on the water depth measurement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the flow measurement system in one embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure and the measuring bridge in one embodiment of the present invention;

[0021] Figure 3 for Figure 2A structural diagram from another perspective.

[0022] Explanation of reference numerals in the attached figures:

[0023] 1. Flow ramp; 11. First slope; 12. Second slope; 2. Radar level gauge; 3. Installation structure; 31. Crossbeam; 32. Support leg; 4. Channel; 5. Measuring bridge; 51. Bridge body; 52. Bridge deck; 53. Guardrail; 54. Observation hole; 6. Base. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] The purpose of this invention is to provide a flow measurement system to solve the problems existing in the prior art. By setting a flow riser on the bottom of the channel, the flow velocity of the water flowing through the first slope of the flow riser is increased, which avoids the deposition of silt in the water on the first slope. The water depth measured by the radar water level gauge is the actual water depth, thereby ensuring the accuracy of the flow rate calculated based on the water depth measurement value.

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] Example 1:

[0028] like Figures 1-3 As shown, this embodiment provides a flow measurement system, including a riser sill 1, a radar level gauge 2, and an installation structure 3. The riser sill 1 is installed on the bottom surface of a channel 4, and its sidewalls are flush with the sidewalls of the channel 4 to ensure that water flows over the riser sill 1. The riser sill 1 has a first slope 11 that is higher than the bottom surface of the channel 4 and gradually decreases in height along the water flow direction. The installation structure 3 places the radar level gauge 2 above the first slope 11, enabling the radar level gauge 2 to measure the water flow depth at a certain cross section on the first slope 11.

[0029] In use, the radar level gauge 2 is installed above the first slope 11 via the mounting structure 3. When water flows over the first slope 11, the flow velocity increases under the action of gravity, preventing sediment from being deposited on the first slope 11. Since there is no sediment accumulation on the first slope 11, the measured value of the water flow depth at the measuring section on the first slope 11 obtained by the radar level gauge 2 is equal to the actual value of the water flow depth at that location, ensuring the accuracy of the flow rate calculated based on the water flow depth measurement value.

[0030] It should be noted that when the radar level gauge 2 is installed in a dry channel 4, its installation height relative to the bottom of the channel 4 at the measurement section can be measured (this can be obtained by the radar level gauge 2 itself). When water flows through, the radar level gauge 2 projects radar waves towards the water surface. After reflection from the water surface, the radar waves are received, providing the distance between the water surface and the bottom of the channel 4, which is the water depth measurement. However, when a large amount of silt accumulates on the bottom of the channel 4, the water flow is above the silt. When using the radar level gauge 2 to measure the water level, the water depth measurement is actually the sum of the actual water depth (distance from the water surface to the silt surface) and the thickness of the silt. Since the thickness of the silt is unknown, when there is a large amount of silt on the bottom of the channel 4, the water depth measurement obtained by the radar level gauge 2 is not the actual water depth, and the flow rate calculated based on this water depth measurement is inaccurate.

[0031] In this embodiment, by setting a riser sill 1 on the bottom surface of the channel 4, the flow velocity of the water flowing through the first slope 11 on the riser sill 1 is increased, which avoids the deposition of silt in the water on the first slope 11. The water depth measured by the radar water level gauge 2 is the actual water depth, thereby ensuring the accuracy of the flow rate calculated based on the water depth measurement value.

[0032] In addition, a steep slope is set at the bottom near the flow measurement section of the traditional channel 4. The water flowing over this steep slope also has the effect of flushing away the silt deposited on the bottom of channel 4. However, when the water flow in channel 4 has a high sediment content, a large amount of silt will accumulate in the upstream and downstream sections of the steep slope at the flow measurement section of channel 4. The steep slope at the flow measurement section will also gradually be silted up, so that the steep slope set at the flow measurement section loses its effect of accelerating the water flow velocity. After setting up a lift sill 1 at the bottom of the flow measurement section of channel 4, because the lift sill 1 itself has a certain height, even if the sediment content in the water flow is high, it will delay the time when the surface of the lift sill 1 will accumulate silt due to the silt accumulation upstream and downstream of channel 4. Thus, for a period of time, the water depth measured on the lift sill 1 will not be affected by the silt accumulation, reducing the frequency of silt removal.

[0033] Based on the structure of different channels 4 and the sediment content in the water flow within channels 4, the inclination angle of the first slope 11 can be reasonably set to form a steep slope, making the water flowing through the first slope 11 a rapid flow (Froude number Fr greater than 1).

[0034] Since there is a certain height difference between the apex of the first slope 11 and the bottom of the channel 4, in order to facilitate the flow of water through the first slope 11, the riser sill 1 in this embodiment also has a second slope 12 connected to the first slope 11; along the direction of water flow, the height of the second slope 12 gradually increases. In this embodiment, along the direction of water flow, the length of the second slope 12 is less than the length of the first slope 11.

[0035] In one embodiment, the installation structure 3 includes a bracket spanning across the channel 4, with the radar level gauge 2 fixedly mounted on the bracket. In use, the radar level gauge 2 and a flow velocity meter are used in conjunction. Multiple radar level gauges 2 are installed, and operators obtain a water level-flow rate relationship curve based on the measurement data from the radar level gauges 2 and the flow velocity meter at each location, and then calculate the flow rate. The plotting of the water level-flow rate relationship curve and the calculation of the flow rate based on it are techniques well-known to those skilled in the art, and will not be elaborated upon in this embodiment.

[0036] In another embodiment, the installation structure 3 includes a bracket spanning across the channel 4. A track is installed within the bracket along the span direction, and a self-propelled device for fixing the radar level gauge 2 is mounted on the track. Driven by the self-propelled device, the radar level gauge 2 can reciprocate on the track. When the water flow velocity in the channel 4 is high, the water surface will fluctuate significantly, leading to a large deviation in water depth measurement and making it impossible to effectively measure the actual water depth. The array-type radar flow meter can scan the water surface from one side of the channel 4 to the other, forming a water surface line. Through a certain algorithm, the water depth at the measurement section of the channel 4 can be calculated very accurately. With the aid of a proprietary algorithm (refer to the algorithm disclosed in invention patent number 2023112228304), the flow rate of the channel 4 can be calculated without calibrating the channel 4 water level-flow relationship curve, making measurement more convenient and eliminating the influence of waves caused by rapid currents, ensuring accurate measurement data.

[0037] The track and self-propelled device inside the support can be made using conventional technology, and their structure will not be described in detail in this embodiment.

[0038] In this embodiment, the flow measurement system also includes a measuring bridge 5 spanning across the channel 4 and adjacent to the support. The bridge deck 52 of the measuring bridge 5 has observation holes 54 for placing a flow meter during manual verification. To ensure the safety of personnel walking on the bridge deck 52, guardrails 53 are installed on both sides of the measuring bridge 5 in this embodiment. The guardrails 53 can be welded from seamless steel pipes, with the bottom end welded to a first metal connector. The bridge body 51 of the measuring bridge 5 is a steel structure, including long steel beams on both sides spanning the channel 4 and short steel beams welded between the crossbeams 31. Steel plates are installed on the long and short steel beams to form the bridge deck 52. Second metal connectors are welded to the steel beams, and the first and second metal connectors are bolted together to fix the guardrails 53. Furthermore, the bolted connection facilitates disassembly and replacement when the guardrails 53 are damaged.

[0039] In this embodiment, the flow measurement system also includes bases 6 disposed on both sides of the channel 4, with both ends of the support and both ends of the measuring bridge 5 fixed to the bases 6. Specifically, the bases 6 can be reinforced concrete structures. The support includes a crossbeam 31 and legs 32 located at both ends of the crossbeam 31, with a track disposed in the crossbeam 31, and the legs 32 fixed to the bases 6. Both ends of the bridge body 51 of the measuring bridge 5 are fixed to the bases 6, and both the bridge body 51 and the legs 32 can be connected to the bases 6 by anchor bolts.

[0040] Example 2:

[0041] This embodiment provides a flow measurement method based on the above-mentioned flow measurement system, including the following steps: a flow riser 1 is set on the bottom surface of the channel 4, the flow velocity of the water increases when it flows through the first slope 11 on the flow riser 1, and no sediment can be deposited on the first slope 11; a radar water level gauge 2 is set above the first slope 11 to measure the water flow depth of a section on the first slope 11 and calculate the flow rate of the channel 4.

[0042] Any adaptive changes made according to actual needs are within the protection scope of this utility model.

[0043] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A flow measuring system, characterized by include: A flow riser is provided on the bottom surface of the channel, the sidewall of the flow riser is attached to the sidewall of the channel, and the flow riser has a first slope that is higher than the bottom surface of the channel and gradually decreases in height along the direction of water flow. A radar level gauge, used to measure the depth of water flow on the first slope; And an installation structure, wherein the installation structure positions the radar level gauge above the first slope.

2. The flow measuring system of claim 1, wherein, The riser also has a second slope connected to the first slope, and the height of the second slope gradually increases along the direction of water flow.

3. The flow measuring system of claim 2, wherein, Along the direction of water flow, the length of the second slope is less than the length of the first slope.

4. The flow measuring system of claim 1, wherein, The installation structure includes a bracket spanning across the channel, and the radar level gauge is fixed to the bracket.

5. The flow measuring system of claim 1, wherein, The installation structure includes a bracket spanning across the channel, with a track inside the bracket along the span direction, and a self-propelled device for fixing the radar level gauge on the track.

6. The flow measuring system of claim 4 or 5, wherein, It also includes a measuring bridge that spans across the channel and is adjacent to the support.

7. The flow measurement system according to claim 6, characterized in that, Guardrails are installed on both sides of the measuring bridge.

8. The flow measuring system of claim 7, wherein, It also includes bases set on both sides of the channel, with both ends of the bracket and both ends of the measuring bridge fixed on the bases.

Images