River flow velocity measuring device based on electromagnetic induction principle

Abstract

The utility model provides a river flow velocity measuring device based on an electromagnetic induction principle. The river flow velocity measuring device comprises a fish lead body, a detection channel which penetrates through the lead fish body is processed in the lead fish body, two electrodes and two electromagnetic coils are embedded in the side wall of the middle of the detection channel, connecting lines formed by the two electrodes and the two electromagnetic coils are perpendicular to each other, and the two electrodes and the two electromagnetic coils are led out from the outer wall of the lead fish body through leads; an insulating lining is further installed in the detection channel, and flow guide plates are installed on the two sides of the tail of the fish lead body. According to the utility model, the lead fish ensures that the posture of the detection device is always correct after entering water, the lead fish is hollow, a pipeline with a fixed size is formed, the excitation coil and the electrode are adopted in the pipeline to form an electromagnetic flowmeter for measuring the flow velocity of a river channel, no water resistance exists, the electromagnetic flowmeter is not influenced by sundries in the river, and the measurement effect is ensured.

Description

Technical Field

[0001] This utility model relates to a river flow velocity measuring device based on the principle of electromagnetic induction. Background Technology

[0002] In the field of hydrology, measuring river flow velocity is an important means of monitoring rainfall in areas through which rivers flow. By detecting river flow velocity, natural disasters such as floods can be predicted, preventing disasters for residents along the riverbanks. Current methods for monitoring river flow velocity use Doppler head weights. This method uses the weight of the head weight to ensure that the Doppler instrument does not drift with the current during measurement, thus ensuring measurement accuracy. However, this method places the Doppler instrument at the front of the head weight, and rivers often contain many floating debris such as branches and weeds, which can entangle or even damage the Doppler instrument. Therefore, a method that can prevent damage to the measuring instrument is needed.

[0003] For example, CN213688332U describes a wedge-shaped lead weight that can prevent aquatic plants from tangling around it. It avoids tangling by setting the shape of the lead weight to a wedge shape and monitors the flow by installing an electromagnetic current meter in the channel at the bottom. However, placing the electromagnetic current meter in the channel not only affects the flow rate of the river, but also the debris in the channel can damage the electromagnetic current meter. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a river flow velocity measuring device based on the principle of electromagnetic induction.

[0005] This utility model is achieved through the following technical solution.

[0006] This utility model provides a river flow velocity measuring device based on the principle of electromagnetic induction, including a lead fish body; a detection channel is machined through the center of the lead fish body, and two electrodes and an electromagnetic coil are respectively embedded in the side wall of the middle part of the detection channel. The lines formed by the two electrodes and the two electromagnetic coils are perpendicular to each other, and the two electrodes and the two electromagnetic coils are led out from the outer wall of the lead fish body through lead wires; an insulating liner is also installed in the detection channel, and flow guide plates are installed on both sides of the tail of the lead fish body.

[0007] Limiting grooves are machined at both ends of the detection channel. The limiting grooves are arc-shaped annular grooves. The two ends of the insulating liner opposite to the detection channel are machined with bends of the same shape as the limiting grooves.

[0008] The lead wires include two electrode leads and a magnetic circuit lead, both of which are embedded in the inner wall of the lead fish body. The lower ends of the two electrode leads are connected to two electrodes respectively, and the lower ends of the two magnetic circuit leads are connected to two electromagnetic coils respectively. The two electrode leads and the two magnetic circuit leads extend out of the lead fish body in parallel.

[0009] The electrode leads and magnetic circuit leads are respectively wrapped with shielding sleeves, and the outer wall of the lead fish body is provided with a protective sleeve that surrounds the electrode leads and magnetic circuit leads, and the inside of the protective sleeve is filled with sealant.

[0010] The protective sleeve is located on the top of the lead fish body.

[0011] Two electrodes and two electromagnetic coils are respectively located on the vertical and horizontal sides of the lead fish body. The front and rear ends of the top of the lead fish body are respectively fixed with a front hanging block and a rear hanging block.

[0012] The guide plate and the lead fish body are connected by a connecting plate, and the inner shape of the connecting plate fits the tail of the lead fish body.

[0013] The beneficial effects of this utility model are as follows: the lead weight ensures that the detection device maintains the correct posture after entering the water. The lead weight is hollow inside, forming a pipe of fixed size. An electromagnetic current meter is formed inside the pipe using an excitation coil and electrodes to measure the river flow velocity. There is no water resistance, and the electromagnetic current meter is not affected by debris in the river, thus ensuring the measurement effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the cross-sectional structure of the present invention;

[0016] Figure 3 This is a schematic diagram of the insulation layer assembly structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the insulation layer, motor, and coil structure of this utility model;

[0018] Figure 5 This is a schematic diagram of the guide plate assembly structure of this utility model;

[0019] In the diagram: 1-Guide plate, 2-Lead fish body, 3-Lead wire, 4-Sheath, 5-Front lifting block, 6-Insulating liner, 7-Detection channel, 8-Rear lifting block, 9-Connecting plate, 10-Limiting groove, 11-Shielding sleeve, 12-Electrode lead wire, 13-Magnetic circuit lead wire, 14-Electrode, 15-Electromagnetic coil, 16-Limiting ring. Detailed Implementation

[0020] The technical solution of this utility model is further described below, but the scope of protection is not limited to what is described.

[0021] A river flow velocity measuring device based on the principle of electromagnetic induction includes a lead weight body 2; a detection channel 7 is machined through the center of the lead weight body, and two electrodes 14 and electromagnetic coils 15 are respectively embedded in the side wall of the middle part of the detection channel 7. The lines formed by the two electrodes 14 and the two electromagnetic coils 15 are perpendicular to each other, and the two electrodes 14 and the two electromagnetic coils 15 are all led out from the outer wall of the lead weight body 2 through lead wires 3; an insulating liner 6 is also installed inside the detection channel 7, and flow guide plates 1 are installed on both sides of the tail of the lead weight body 2. Figure 1 As shown, this application combines an electromagnetic current meter with a lead fish. An excitation coil and electrodes are installed inside the inner wall of the lead fish to form an electromagnetic current meter. The excitation coil and electrodes are protected by an insulating liner so that the channel inside the lead fish will not obstruct the river, and the electromagnetic current meter is also protected.

[0022] Furthermore, limiting grooves 10 are machined at the openings at both ends of the detection channel 7. The limiting grooves 10 are arc-shaped annular grooves. The two ends of the insulating liner 6 opposite to the detection channel 7 are machined with bends of the same shape as the limiting grooves 10. The bends of the insulating liner are embedded in the limiting grooves at both ends of the detection channel, so that the two ends of the insulating liner form flared openings, reducing the obstruction of the channel sidewalls to the river water.

[0023] Furthermore, the lead wire 3 includes two electrode leads 12 and a magnetic circuit lead 13. Both the electrode leads 12 and the magnetic circuit lead 13 are embedded in the inner wall of the lead fish body 2. The lower ends of the two electrode leads 12 are connected to two electrodes 14, and the lower ends of the two magnetic circuit leads 13 are connected to two electromagnetic coils 15. All two electrode leads 12 and two magnetic circuit leads 13 extend parallel to each other outside the lead fish body 2. The lead wire 3 is connected to a control console, where the PLC collects, converts, and records the acquired data.

[0024] Furthermore, in order to prevent the electrode leads and magnetic circuit leads from interfering with each other, the electrode leads 12 and magnetic circuit leads 13 are respectively wrapped with shielding sleeves 11, and the outer wall of the lead fish body 2 is provided with a protective sleeve 4 to surround the electrode leads 12 and magnetic circuit leads 13, and the protective sleeve 4 is filled with sealant.

[0025] Furthermore, to prevent the river from seeping into the lead fish along the lead wire, a sheath 4 is placed on top of the lead fish body 2, and the outlet of the lead wire is sealed with sealant.

[0026] Furthermore, two electrodes 14 and two electromagnetic coils 15 are respectively located on the vertical and horizontal sides of the lead fish body 2. The front and rear ends of the top of the lead fish body 2 are respectively fixed with a front hanging block 5 and a rear hanging block 8. The front and rear hanging blocks are connected to the cable through steel wire ropes, and the movement of the lead fish is controlled by a traction device.

[0027] Furthermore, the guide plate 1 and the lead weight body 2 are connected by a connecting plate 9, the inner shape of which fits the tail of the lead weight body 2. The guide plate ensures the lead weight's head is forward, guaranteeing its correct posture upon entry into the water.

Claims

1. A river flow velocity measuring device based on the principle of electromagnetic induction, comprising a lead fish body (2), characterized in that: The lead fish body (2) is provided with a detection channel (7) penetrating the center of the lead fish body (2), two electrodes (14) and two electromagnetic coils (15) are respectively embedded on the side wall of the middle part of the detection channel (7), the connecting lines of the two electrodes (14) and the two electromagnetic coils (15) are perpendicular to each other, and the two electrodes (14) and the two electromagnetic coils (15) are led out from the outer wall of the lead fish body (2) through lead wires (3); the detection channel (7) is further provided with an insulating lining (6), and the tail part of the lead fish body (2) is provided with a flow guide plate (1).

2. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 1, characterized in that: The two ends of the detection channel (7) are provided with limiting grooves (10), the limiting grooves (10) are arc-shaped grooves, and the two ends of the insulating lining (6) are provided with bending parts which are the same as the limiting grooves (10) in shape.

3. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 1, characterized in that: The lead wires (3) include two electrode lead wires (12) and magnetic circuit lead wires (13), the electrode lead wires (12) and the magnetic circuit lead wires (13) are embedded in the inner wall of the lead fish body (2), the lower ends of the two electrode lead wires (12) are connected with the two electrodes (14) respectively, the lower ends of the two magnetic circuit lead wires (13) are connected with the two electromagnetic coils (15) respectively, and the two electrode lead wires (12) and the two magnetic circuit lead wires (13) are parallelly led out of the lead fish body (2).

4. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 3, characterized in that: The electrode lead wires (12) and the magnetic circuit lead wires (13) are respectively wrapped with shielding sleeves (11), and the lead fish body (2) is provided with a sheath (4) which surrounds the electrode lead wires (12) and the magnetic circuit lead wires (13), and the sheath (4) is filled with sealing glue.

5. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 4, characterized in that: The sheath (4) is arranged on the top of the lead fish body (2).

6. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 1, characterized in that: The two electrodes (14) and the two electromagnetic coils (15) are arranged on the vertical direction and the horizontal direction of the lead fish body (2) respectively, and the lead fish body (2) is provided with a front hanging block (5) and a rear hanging block (8) which are respectively fixed on the front end and the rear end of the top of the lead fish body (2).

7. The river flow velocity measuring device based on the principle of electromagnetic induction according to claim 1, characterized in that: The flow guide plate (1) and the lead fish body (2) are connected through a connecting plate (9), and the inner side of the connecting plate (9) is matched with the tail part of the lead fish body (2).

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