Electromagnetic lead fish current meter

Abstract

The utility model relates to the technical field of water conservancy and hydrological survey, and discloses an electromagnetic lead fish flow velocity meter, which comprises an electromagnetic lead fish flow velocity meter head, an electromagnetic lead fish flow velocity meter tail is fixedly arranged on the rear surface of the electromagnetic lead fish flow velocity meter head, and a first hanging point is arranged on the outer surface of the electromagnetic lead fish flow velocity meter head, a speed measuring mechanism is arranged on the tail portion of the electromagnetic lead fish flow velocity meter, a shell of the lead fish is made of stainless steel 304 materials in a finish machining mode, the lead fish flow velocity meter can be soaked in various fluids for a long time and is stable in physical and chemical performance, the appearance is designed in combination with fluid mechanics, a fish body is an arc-shaped smooth curved surface, and simulation fins and empennages are designed in the middle of the fish body. The top of the fish body is provided with two balance lifting points, the fish body can be kept balanced and stable in a water body after being lifted by a measuring rope, and the device is wide in application drainage basin, convenient to install and use and capable of being used and measured at any time, and boundary layer separation and tail end vortexes which influence measurement are not generated by streamlines when liquid flows through the surface of the lead fish.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy and hydrological survey, in particular to an electromagnetic lead fish current meter. Background Art

[0002] The hydrological testing lead fish currently on the market is a lead measuring tool used to stabilize underwater measuring instruments and reduce deviation in rivers and streams. Its function is to install and fix the measuring instruments and keep them in a stable measuring state in the water flow.

[0003] The lead fish itself does not have a measurement function, but relies on a propeller current meter fixed on its body for measurement. This method is easily affected by water flow fluctuations and sediment impact in actual measurement applications. The propeller meter is prone to damage and loosening when working underwater for a long time, resulting in a large deviation between the measured flow rate and the actual reference value. In view of this, an electromagnetic lead fish current meter is proposed. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides an electromagnetic lead fish flow meter, which solves the problems of poor measurement range, accuracy and stability of the electromagnetic lead fish flow meter.

[0006] (II) Technical solution

[0007] In order to realize the above-mentioned integrated structural design, integrate the flow rate measurement system with the lead fish body, simplify the measurement installation process, and improve the measurement range, accuracy and stability, the utility model provides the following technical solutions: an electromagnetic lead fish flow meter, comprising an electromagnetic lead fish flow meter head, the rear surface of the electromagnetic lead fish flow meter head is fixedly installed with the electromagnetic lead fish flow meter tail, and the outer surface of the electromagnetic lead fish flow meter head is provided with a first hanging point;

[0008] Among them, a speed measuring mechanism is provided on the tail of the electromagnetic lead fish flowmeter, and the speed measuring mechanism includes an upper fin, a second hanging point, two side fins, a lower fin, a guide tube, a flow meter body, an iron core, a magnetic yoke, a magnetic coil and a signal electrode.

[0009] Preferably, the upper fin is fixedly mounted on the outer surface of the tail of the electromagnetic lead fish current meter, and the second hanging point is opened on the left surface of the upper fin.

[0010] Preferably, the two side fins are fixedly mounted on the outer surface of the tail of the electromagnetic lead fish current meter, and the lower fin is fixedly mounted on the outer surface of the tail of the electromagnetic lead fish current meter.

[0011] Preferably, the flow guide tube is arranged in the head of the electromagnetic lead fish flow meter and the tail of the electromagnetic lead fish flow meter;

[0012] The flow rate measuring device body is arranged in the head part and the tail part of the electromagnetic lead fish flow rate meter.

[0013] Preferably, the iron core is arranged in the body of the flow rate measuring device, and the magnetic yoke is sleeved on the outer surface of the iron core.

[0014] Preferably, the magnetic coil is sleeved on the outer surface of the magnetic yoke, the signal electrode is arranged in the flow rate measuring device body, and the signal electrode is electrically connected to the magnetic yoke.

[0015] (III) Beneficial effects

[0016] Compared with the prior art, the utility model provides an electromagnetic lead fish flow meter, which has the following beneficial effects:

[0017] 1. The electromagnetic lead fish flowmeter, the shell of the lead fish is made of stainless steel 304 material, it can be immersed in various fluids for a long time, with stable physical and chemical properties, and the appearance is designed in combination with fluid mechanics. The fish body is an arc-shaped smooth surface with simulated fins and tail fins in the middle to ensure that when the liquid flows over the surface of the lead fish, the streamline does not produce boundary layer separation and tail vortex that affect the measurement. There are two balance hanging points on the top of the fish body. After being lifted by the measuring rope, it can ensure that the fish body remains balanced and stable in the water. It is suitable for a wide range of watersheds, easy to install and use, and can be measured whenever needed.

[0018] 2. The electromagnetic lead fish flowmeter has a mouth with a diameter of 40mm. It has a straight-through structure from the mouth to the tail, and there is no flow obstruction inside. When water flows through the belly of the fish, the flow rate does not change. The flow rate measurement system is located in the middle of the belly of the fish to monitor the flow rate of the water flowing through the belly of the fish in real time. The space between the flow rate measurement system and the outer shell is densely filled with lead filling technology. The flow rate detection electrodes are located at symmetrical positions on both sides of the guide tube in the belly of the fish to ensure that the axes of the two electrodes are perpendicular to the flow direction of the liquid. The detection electrode is made of 316L and has an arc surface. On the one hand, it reduces the wear caused by liquid impact, and on the other hand, it reduces the surface attachment of impurities in the fluid to the detection electrode. There is no spoiler inside, which does not change the water flow velocity. The measurement result is closer to the actual flow velocity of the measured basin, and the measurement range is large: (0.01-10) m / s, and the resolution is high: 0.001 m / s.

[0019] 3. The electromagnetic lead fish flow meter has good stability and high precision. The external structure is designed in combination with fluid mechanics, and the internal structure has no obstructions. It is stable and reliable for long-term use. It supports multiple power supply modes such as AC 220V, DC 24V, solar energy, and lithium batteries. The instrument has complete display output functions and can display measurement data such as flow rate, instantaneous flow, and hourly flow.

[0020] 4. The flow detection electrodes of this electromagnetic lead fish flow meter are located at symmetrical positions on both sides of the guide tube in the fish belly, ensuring that the axes of the two electrodes are perpendicular to the flow direction of the liquid. The detection electrode is made of 316L, and the head is in the form of an arc surface, which reduces the wear caused by liquid impact on the one hand, and reduces the surface adhesion of impurities in the fluid to the detection electrode on the other hand. The excitation system is composed of copper coil windings, iron cores, yokes and clamps. Corresponding positioning holes are designed inside the probe to ensure the relative position and matching accuracy of the above-mentioned parts after assembly, and to ensure the uniformity and stability of the working magnetic field provided by the excitation system. The measurement principle adopts Faraday's law of electromagnetic induction, combined with the characteristics of the hydrographic lead fish's own structure, and perfectly integrates the two. In the application of water velocity measurement, it is not only stable and reliable, but also has higher measurement accuracy and is closer to the true velocity value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of an electromagnetic lead fish current meter of the utility model;

[0022] Figure 2 This is a schematic diagram of the tail structure of the electromagnetic lead fish current meter of the utility model;

[0023] Figure 3 This is a schematic diagram of the tail structure of the electromagnetic lead fish current meter of the utility model;

[0024] Figure 4 The utility model is a schematic diagram of the internal structure of the electromagnetic lead fish current meter head.

[0025] In the figure: 1. Head of electromagnetic lead fish flowmeter; 2. Tail of electromagnetic lead fish flowmeter; 3. First hanging point; 4. Upper fin; 5. Second hanging point; 6. Side fin; 7. Lower fin; 8. Flow guide tube; 9. Flow meter body; 10. Iron core; 11. Magnetic yoke; 12. Magnetic coil; 13. Signal electrode. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] See also Figure 1-4 The utility model provides a new technical solution: an electromagnetic lead fish flow meter, comprising an electromagnetic lead fish flow meter head 1, an electromagnetic lead fish flow meter tail 2 is fixedly installed on the rear surface of the electromagnetic lead fish flow meter head 1, and a first hanging point 3 is opened on the outer surface of the electromagnetic lead fish flow meter head 1;

[0028] Among them, a speed measuring mechanism is provided on the tail 2 of the electromagnetic lead fish current meter, and the speed measuring mechanism includes an upper fin 4, a second hanging point 5, two side fins 6, a lower fin 7, a flow guide tube 8, a flow meter body 9, an iron core 10, a magnetic yoke 11, a magnetic coil 12 and a signal electrode 13.

[0029] Furthermore, the upper fin 4 is fixedly mounted on the outer surface of the tail 2 of the electromagnetic lead fish current meter, and the second hanging point 5 is opened on the left surface of the upper fin 4 .

[0030] Furthermore, two side fins 6 are fixedly mounted on the outer surface of the tail 2 of the electromagnetic lead fish current meter, and the lower fin 7 is fixedly mounted on the outer surface of the tail 2 of the electromagnetic lead fish current meter.

[0031] Further, the flow guide tube 8 is arranged in the head 1 of the electromagnetic lead fish flow meter and the tail 2 of the electromagnetic lead fish flow meter;

[0032] The flow rate measuring device body 9 is arranged in the head 1 and the tail 2 of the electromagnetic lead fish flow meter.

[0033] Furthermore, the iron core 10 is disposed in the flow velocity measuring device body 9 , and the yoke 11 is sleeved on the outer surface of the iron core 10 .

[0034] Furthermore, the magnetic coil 12 is sleeved on the outer surface of the magnetic yoke 11, the signal electrode 13 is arranged in the flow velocity measuring device body 9, and the signal electrode 13 is electrically connected to the magnetic yoke 11;

[0035] The electromagnetic lead fish flowmeter adopts Faraday's law of electromagnetic induction as its measuring principle. The key components of the flow measurement system include the excitation coil, signal electrode, iron core, magnetic yoke, etc. The components are assembled together in advance, and then the assembly is placed in the mold for making the lead fish and cast as a whole. In the belly of the lead fish, a flow tube with a diameter of 40mm is reserved. The axis of the flow tube is parallel to the water flow measurement line. The inner wall of the flow tube is smooth and has no flow obstructions. The water flow velocity inside the flow tube is consistent with the external water flow velocity. By measuring the flow velocity in the flow tube, the water flow velocity of the measurement line can be known.

[0036] The shell of the lead fish is made of stainless steel 304 and can be immersed in various fluids for a long time. It has stable physical and chemical properties and its appearance is designed in combination with fluid mechanics. The fish body is an arc-shaped smooth surface with simulated fins and tail fins in the middle to ensure that when the liquid flows over the surface of the lead fish, the streamlines do not produce boundary layer separation and tail vortex that affect the measurement. There are two balance hanging points on the top of the fish body. After being lifted by the measuring rope, the fish body can be ensured to remain balanced and stable in the water.

[0037] The fish mouth opens to a diameter of 40mm, and it is a straight-through structure from the fish mouth to the fish tail with no flow obstructions inside. When water flows through the fish's belly, the flow rate does not change. The flow rate measurement system is located in the middle of the fish's belly, which is used to monitor the flow rate of the water flowing through the fish's belly in real time. The space between the flow rate measurement system and the outer shell is densely filled with lead pouring technology.

[0038] Furthermore, the flow velocity detection electrodes are located at symmetrical positions on both sides of the flow guide tube 8 in the fish belly, ensuring that the axes of the two electrodes are perpendicular to the liquid flow direction. The detection electrode is made of 316L and the head is in the form of an arc surface. On the one hand, it reduces the wear caused by liquid impact, and on the other hand, it reduces the surface adhesion of impurities in the fluid to the detection electrode. There is no spoiler inside, and the water flow velocity is not changed. The measurement result is closer to the actual flow velocity of the measured basin, and the measurement range is large: (0.01-10) m / s, and the resolution is high: 0.001 m / s.

[0039] The flow rate detection electrodes are located symmetrically on both sides of the flow guide tube in the fish belly, ensuring that the axes of the two electrodes are perpendicular to the liquid flow direction. The detection electrode is made of 316L and has an arc surface at the head. On the one hand, it reduces the wear caused by liquid impact, and on the other hand, it reduces the surface adhesion of impurities in the fluid to the detection electrode.

[0040] The excitation system is composed of copper coil winding, iron core, yoke and clamps. Corresponding positioning holes are designed inside the probe to ensure the relative position and matching accuracy of the above parts after assembly, and to ensure the uniformity and stability of the working magnetic field provided by the excitation system.

[0041] The conversion circuit is developed using the STM32 microcontroller and consists of the following basic units: a constant current source excitation circuit using a low-frequency excitation square wave, a differential preamplifier, a main amplifier with a low-pass filter, a synchronous sampling and holding circuit, a conversion circuit for analog current output, frequency output and flow integration, a peripheral storage device, a digital communication circuit, a power supply circuit, etc.

[0042] Furthermore, the electromagnetic lead fish flowmeter has good stability and high precision; the external structure is designed in combination with fluid mechanics, and the internal structure has no obstructions. It is stable and reliable for long-term use, supports multiple power supply modes such as AC 220V, DC 24V, solar energy, and lithium batteries, and the instrument has complete display output functions and can display measurement data such as flow rate, instantaneous flow, and hourly flow.

[0043] Working principle: The electromagnetic lead fish flowmeter adopts Faraday's law of electromagnetic induction as its measuring principle. The key components of the flow measurement system include the excitation coil, signal electrode, iron core, magnetic yoke, etc. The components are assembled together in advance, and then the assembly is placed in the mold for making the lead fish and cast as a whole. In the belly of the lead fish, a flow tube with a diameter of 40mm is reserved. The axis of the flow tube is parallel to the water flow measurement line. The inner wall of the flow tube is smooth and has no flow obstructions. The water flow velocity inside the flow tube is consistent with the external water flow velocity. By measuring the flow velocity in the flow tube, the water flow velocity of the measurement line can be known.

[0044] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electromagnetic lead fish current meter, comprising an electromagnetic lead fish current meter head (1), an electromagnetic lead fish current meter tail (2) fixedly mounted on the rear surface of the electromagnetic lead fish current meter head (1), characterized in that: The outer surface of the head (1) of the electromagnetic lead fish current meter is provided with a first hanging point (3); The tail (2) of the electromagnetic lead fish current meter is provided with a speed measuring mechanism, which comprises an upper fin (4), a second suspension point (5), two side fins (6), a lower fin (7), a flow guide tube (8), a flow meter body (9), an iron core (10), a magnetic yoke (11), a magnetic coil (12) and a signal electrode (13).

2. An electromagnetic lead fish current meter according to claim 1, characterized in that: The upper fin (4) is fixedly mounted on the outer surface of the tail (2) of the electromagnetic lead fish current meter, and the second hanging point (5) is opened on the left surface of the upper fin (4).

3. An electromagnetic lead fish current meter according to claim 1, characterized in that: The two side fins (6) are fixedly mounted on the outer surface of the tail portion (2) of the electromagnetic lead fish current meter, and the lower fin (7) is fixedly mounted on the outer surface of the tail portion (2) of the electromagnetic lead fish current meter.

4. An electromagnetic lead fish current meter according to claim 1, characterized in that: The flow guide tube (8) is arranged in the head (1) and the tail (2) of the electromagnetic lead fish flow meter; The flow rate measuring device body (9) is arranged in the head (1) and the tail (2) of the electromagnetic lead fish flow meter.

5. The electromagnetic lead fish current meter according to claim 1, characterized in that: The iron core (10) is arranged in the flow rate measuring device body (9), and the magnetic yoke (11) is sleeved on the outer surface of the iron core (10).

6. The electromagnetic lead fish current meter according to claim 1, characterized in that: The magnetic coil (12) is sleeved on the outer surface of the magnetic yoke (11), the signal electrode (13) is arranged in the flow rate measuring device body (9), and the signal electrode (13) is electrically connected to the magnetic yoke (11).

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