[0034] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. The present embodiment is implemented on the premise of the technical solutions of the present invention, and provides detailed embodiments and specific operation processes, but the protection scope of the present invention is not limited to the following described embodiment.
[0035] The multi-layer open channel portable current measuring device based on the water impulse principle of the present invention has the following structure: Figure 1-2 As shown, it includes a U-shaped hollow tube 5, a horizontal stage 6 is fixed at both ends of the U-shaped hollow tube 5, and a pressure sensor 1 is arranged at the center of the bottom; Each hollow light-weight steel ball 3 is connected with the U-shaped hollow tube 5 through the light-weight elastic steel ropes 4 arranged in parallel with each other; each light-weight elastic steel rope 4 is connected to the U-shaped hollow tube The end of 5 is provided with a tension sensor 2, the tension sensor 2 and the pressure sensor 1 are respectively connected to the data acquisition and transmission module 7 through the data transmission signal line 8, and the data acquisition and transmission module 7 is wirelessly connected to the controller 11.
[0036] The data transmission signal line 8 is built in the U-shaped hollow tube 5 , and the upper end passes through the horizontal stage 6 and is connected to the data acquisition and transmission module 7 .
[0037] Two levels 10 and two levels 10 are horizontally arranged on the horizontal stage 6 and are perpendicular to each other.
[0038] The data acquisition and transmission module 7 is connected to the controller 11 through the data transmission antenna 9 .
[0039] As a control center, the controller 11 is an intelligent display controller, which is used to receive the data measured by the sensors collected by the data collection and transmission module.
[0040] A leveling knob 12 in a vertical direction is also provided on the horizontal stage 6 .
[0041] There are 5 hollow lightweight steel balls 3.
[0042] The U-shaped hollow tube, light steel ball, and elastic steel rope horizontal stage of the present invention are all made of stainless steel, which can prevent deformation and corrosion in water and ensure the accuracy of current measurement.
[0043] The size of the U-shaped hollow tube, light-weight steel ball and elastic steel rope of the present invention can be determined by the technical personnel in the field according to the size of the channel suitable for the device during design and production.
[0044] The measuring principle of the present invention: the flow measuring device of the present invention divides the flow section into standard isosceles triangles and isosceles trapezoids, uses the formulas corresponding to different flow velocity areas at different levels to obtain multi-level flow values, and obtains the instantaneous flow of the entire flow section after accumulation. When the device and method are used in practice, the device is easy to operate and easy to learn, suitable for non-professionals to operate, and easy to popularize.
[0045] The present invention is based on the flow measurement method of the multi-layer open channel portable flow measurement device based on the principle of water impulse, and the specific operation steps are as follows:
[0046] Step 1. Put the current measuring device on the top of the channel, so that the bottom of the U-shaped hollow tube touches the bottom of the channel, and the leveling knob is used to adjust the level of the horizontal stage of the current measuring device; turn on the power of the current measuring device to start the measurement, measure The obtained data will be wirelessly transmitted to the controller through the data acquisition and transmission module, and the measured historical data and real-time data can be viewed on the controller.
[0047]Step 2. The water pressure felt by the device through the pressure sensor is converted to obtain the water head height of the channel section, that is, the water level H; A series of position "velocity meters" composed of lightweight elastic steel ropes) to measure the flow velocity V at different points 1-n (n depends on the layer determined by the depth of the channel), n=5 in the present invention, and further obtains the instantaneous flow value Q of the entire overflow section through multi-layer flow accumulation, such as Figure 3-5 The specific calculation method is as follows:
[0048]
[0049] of which: A n is the cross-sectional area of different cross-sectional shapes corresponding to hollow lightweight steel balls,
[0050]
[0051]
[0052] V n is the average flow velocity corresponding to the cross-sectional area of different cross-sectional shapes,
[0053]
[0054]
[0055]
[0056]
[0057]
[0058] where: L 1 , L 2 , L 3 , L 4 , L 5 are the initial lengths of 5 lightweight elastic steel ropes without external force; F 1-1 , F 1-2;F 2-1 , F 2-2;F 3-1 , F 3-2;F 4-1 , F 4-2;F 5-1 , F 5-2 Corresponding to the tensile force value of five pairs of tensile force sensors after being impacted by water to stabilize; M 1 =M 2 =M 3 =M 4 =M 5 =M is the mass of the hollow light steel ball; K is the elastic deformation value of the light elastic steel rope; H is the head height of the overcurrent section, which is obtained by the pressure sensor; ΔH is the vertical distance between the adjacent tension sensors.
[0059] At present, there are many kinds of current measuring devices at home and abroad, but due to low measurement accuracy, difficult installation and limitations of the use environment, their scope of use is limited, and it is difficult to popularize and use them on a large scale. The multi-layer open channel portable flow measurement device and method based on the principle of water impulse have simple structure, high measurement accuracy, low power consumption, and simple operation, which can solve the shortcomings of the current water measurement methods in irrigation areas to a certain extent, and can realize the online measurement of flow. and real-time monitoring, so it has broad application prospects.
[0060] The basic principles, main features and advantages of the present invention have been described above. Professionals in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments describe only the principles of the present invention. On the premise of departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements will all fall within the scope of the claimed invention.
