CN114130563B

CN114130563B - Electromagnetic flowmeter, spraying system and unmanned aerial vehicle

Info

Publication number: CN114130563B
Application number: CN202111205108.0A
Authority: CN
Inventors: 舒展; 潘仑; 胡德琪
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2023-05-23
Anticipated expiration: 2039-11-04
Also published as: WO2021087653A1; CN114130563A; CN111630352A; CN111630352B

Abstract

The embodiment of the invention provides an electromagnetic flowmeter, a spraying system and an unmanned aerial vehicle, wherein the electromagnetic flowmeter comprises: a main body having an inlet and an outlet; a plurality of flow tubes disposed in the main body, the plurality of flow tubes communicating with the outside through an inlet and an outlet; each flow tube is provided with a pair of detection electrodes, and one end of each flow tube close to the inlet and one end close to the outlet are provided with grounding electrodes; the electromagnets are arranged in the main body, one side of each flow tube is adjacent to the electromagnet, and one electromagnet is arranged between two adjacent flow tubes; the electromagnet is arranged in the magnetic yoke shell, and the two ends of the magnetic yoke shell, which face the flow tube, are provided with magnetic flux ports. According to the technical scheme provided by the embodiment of the invention, the length of the grounding path can be effectively shortened, the anti-interference capability of the electromagnetic flowmeter is improved, and the reliability of grounding is improved.

Description

Electromagnetic flowmeter, spraying system and unmanned aerial vehicle

Technical Field

The invention relates to the technical field of machinery, in particular to an electromagnetic flowmeter, a spraying system and an unmanned aerial vehicle.

Background

With the continuous development of science and technology, many works replace manual work by machine equipment. For example, a plant protection unmanned aerial vehicle is a device widely used in agriculture and forestry plant protection operations. The plant protection unmanned aerial vehicle can replace people to realize spraying operation, and can spray medicaments, seeds, powder and the like. Taking spraying agent as an example, when the plant protection unmanned aerial vehicle performs spraying operation, in order to improve the control accuracy of spraying and the calculation accuracy of the sprayed drug quantity, an electromagnetic flowmeter is applied. Since the signal detected by the electromagnetic flowmeter is a differential signal, the electromagnetic flowmeter needs a potential reference point and needs to be grounded, i.e. the circuit board is connected with the water flow.

The existing grounding mode has the defects of long grounding path, easy interference, high weight and cost, unreliable grounding, high requirements on manufacturing and assembly precision and the like.

Disclosure of Invention

The present invention has been made in view of the above problems, and an electromagnetic flowmeter, a spraying system, and an unmanned aerial vehicle that solve the above problems are provided.

In one embodiment of the present invention, there is provided an electromagnetic flowmeter including:

a main body having an inlet and an outlet;

a plurality of flow tubes provided in the main body, the plurality of flow tubes communicating with the outside through the inlet and the outlet; each flow tube is provided with a pair of detection electrodes, and one end of the flow tube, which is close to the inlet, and one end of the flow tube, which is close to the outlet, are provided with grounding electrodes;

a plurality of electromagnets disposed within said body, one side of said flow tube adjacent said electromagnets;

wherein, one electromagnet is arranged between two adjacent flow pipes; the electromagnet is arranged in the magnetic yoke shell, and the two ends of the magnetic yoke shell, which face the flow tube, are provided with magnetic flux openings.

In one embodiment of the present invention, there is also provided an electromagnetic flowmeter including:

A main body having an inlet and an outlet;

a flow tube disposed within the body, the flow tube communicating with the outside through the inlet and the outlet; the flow tube is provided with a pair of detection electrodes, and one end of the flow tube, which is close to the inlet, and one end of the flow tube, which is close to the outlet, are both provided with grounding electrodes;

an electromagnet disposed within the body, one side of the flow tube adjacent the electromagnet,

wherein the flow tube is provided with a detection mounting hole,

the detection electrode is of a multi-section columnar structure, and one end part of the detection electrode extends into the detection mounting hole;

the detection electrode is provided with a first sealing structure, and the first sealing structure seals a gap between the detection electrode and the detection mounting hole.

In one embodiment of the present invention, there is also provided a spray system comprising:

the electromagnetic flowmeter described in the above;

the water tank is connected with the flow pipe through the inlet;

the pump is connected with the flow pipe through the outlet;

and the spraying device is connected with the pump.

In one embodiment of the present invention, there is also provided a unmanned aerial vehicle including: unmanned aerial vehicle body and set up unmanned aerial vehicle body on the spraying system of above-mentioned.

According to the technical scheme provided by the embodiment of the invention, the grounding of the electromagnetic flowmeter is realized through the grounding electrode at one end of the flow tube close to the inlet and one end close to the outlet, so that the grounding path length can be effectively shortened, the anti-interference capability of the electromagnetic flowmeter is improved, and the grounding reliability is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the drawings that are required to be used in the description of the embodiments or the conventional technology will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without any inventive effort for those skilled in the art.

FIG. 1 is a schematic diagram of an exploded structure of an electromagnetic flowmeter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an electromagnetic flowmeter according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of the plane A-A in FIG. 2;

FIG. 4 is a schematic cross-sectional view of the B-B plane in FIG. 2;

FIG. 5 is a schematic cross-sectional view of the C-C plane in FIG. 2;

FIG. 6 is a schematic view of the structure of the electromagnetic flowmeter provided in FIG. 2 in the absence of a body;

FIG. 7 is a schematic view of the structure of the electromagnetic flowmeter of FIG. 6 in the absence of electrode plates at another view angle;

FIG. 8 is a schematic cross-sectional view of the D-D plane in FIG. 7;

FIG. 9 is a schematic structural diagram of an electrode plate and a motherboard according to an embodiment of the present invention;

FIG. 10 is a schematic plan view of the structure of FIG. 9;

fig. 11 is a schematic plan view of a unmanned aerial vehicle with a spraying system according to an embodiment of the present invention;

fig. 12 is a schematic perspective view of a unmanned aerial vehicle with a spraying system according to an embodiment of the present invention.

Detailed Description

In order to enable those skilled in the art to better understand the present invention, the following description will make clear and complete descriptions of the technical solutions according to the embodiments of the present invention with reference to the accompanying drawings. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that in the description of the present invention, the terms "first," "second," and the like are merely used for convenience in describing the various elements and are not to be construed as indicating or implying a sequential relationship, relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the conventional technology, since the signal detected by the electromagnetic flowmeter is a differential signal, the electromagnetic flowmeter needs a potential reference point, and needs to be grounded, that is, the circuit board is connected with the water flow. The most grounding means currently used with electromagnetic flowmeters are,

the metal connector is contacted with water, the metal connector is connected with the metal shell, and the metal shell is conducted with the circuit board, so that the water flow and the circuit are connected. The inventor finds that the grounding mode has a plurality of defects through multiple practices, namely, the grounding path is too long and is easy to interfere. Secondly, the connector and the housing must be of metal, adding weight and cost. And thirdly, galvanic corrosion is easy to occur at the joint of the metal connector and the metal shell, and the grounding reliability is affected. And fourthly, the circuit board is connected with the measuring tube and the metal shell, has high requirements on manufacturing and assembly precision, and is not contacted with the shell or deformed under stress once errors occur.

In order to solve the problems, the invention provides an electromagnetic flowmeter, a spraying system and an unmanned aerial vehicle, which can effectively shorten the length of a grounding path, improve the anti-interference capability of the electromagnetic flowmeter and improve the reliability of grounding.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The following embodiments and features of the embodiments may be combined with each other without conflict. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

Fig. 1 is an exploded view of an electromagnetic flowmeter according to an embodiment of the present invention, fig. 2 is a view of an electromagnetic flowmeter according to an embodiment of the present invention, fig. 3 is a view of a cross-section of A-A in fig. 2, fig. 4 is a view of a cross-section of B-B in fig. 2, and fig. 1 to 4 are combined together.

In one embodiment of the present invention, there is provided an electromagnetic flowmeter including: a main body 10, a plurality of flow tubes 20, and a plurality of electromagnets 30.

Wherein the body 10 has an inlet and an outlet. A plurality of flow tubes 20 are provided in the main body 10, and the plurality of flow tubes 20 communicate with the outside through an inlet and an outlet. Each flow tube 20 is provided with a pair of detection electrodes 21, and one end of the flow tube 20 near the inlet and one end near the outlet are both provided with a ground electrode 22. A plurality of electromagnets 30 are disposed within the body 10, one side of the flow tube 20 being adjacent to the electromagnets 30.

Wherein an electromagnet 30 is disposed between two adjacent flow tubes 20. The electromagnet 30 is disposed within a yoke housing having flux ports at its ends facing the flow tube 20.

In the embodiment of the present invention, the main body 10 is understood to be a housing of an electromagnetic flowmeter, and the flow tube 20 and the electromagnet 30 are disposed in the main body 10, where the main body 10 provides protection for the components therein. The main body 10 has an inlet and an outlet for the flow tube 20 to communicate with the outside of the main body 10.

One possible way of implementing the flow tube 20 is that the flow tube 20 is a tubular member, disposed within the body 10, within which fluid can flow. Another implementation manner of the flow tube 20 is that the electromagnetic flowmeter includes a flow tube body, where at least one flow channel is disposed on the flow tube body, and fluid can flow in the flow channel, and the flow channel is the flow tube 20.

A pair of detection electrodes 21 is provided on the flow tube 20, and the detection electrodes 21 extend into the flow tube 20 to be in contact with the fluid. The direction of the magnetic field generated by the electromagnet 30, the direction of the fluid flow in the flow tube 20, and the detection direction of the detection electrode 21 are distributed in an orthogonal manner. When the conductive fluid flows through the magnetic field perpendicular to the flow direction, the conductive fluid induces an induced voltage proportional to the average flow velocity, which is detected by the two detection electrodes 21 that are in direct contact with the conductive fluid. The induced voltage detected by the detection electrode 21 is proportional to the magnetic field strength and the water flow speed, and the magnitude of the fluid flow can be reversely deduced by the voltage value detected by the detection electrode 21. In the embodiment of the present invention, when the electromagnet 30 works, the polarity of the electromagnet 30 facing one end of the flow tube 20 needs to be changed rapidly and repeatedly, so as to form an alternating magnetic field, and avoid charge accumulation in the flow tube 20, which affects the detection of the induced voltage by the detection electrode 21, and thus affects the calculation of the fluid flow. Grounding of the electromagnetic flowmeter can be achieved through the grounding electrode 22 at one end of the flow tube 20 close to the inlet and one end close to the outlet, the grounding path length can be effectively shortened, the anti-interference capability of the electromagnetic flowmeter is improved, and the grounding reliability is improved.

The electromagnet 30 can be externally placed in a magnetic field through the magnetic flux ports at the two ends of the magnetic yoke shell, so that the flow tubes 20 at the two ends are positioned in the magnetic field, and the magnetic fields of the two flow tubes 20 are provided by the electromagnet 30 positioned between the two flow tubes, so that the two flow tubes are symmetrical, and the problem of inconsistent magnetic fields is avoided. Meanwhile, the yoke housing is wrapped on the outer surface of the electromagnet 30, so that leakage of a magnetic field generated after the coil 33 is electrified can be prevented.

The technical scheme provided by the embodiment of the invention includes, but is not limited to, that the electromagnetic flowmeter can be used on equipment such as agricultural plant protection unmanned aerial vehicles, pesticide spraying vehicles, manual spraying devices, greening spraying equipment and the like. The grounding electrode 22 is used for grounding, compared with the prior art, the grounding path is short, the anti-interference capability is strong, the metal connector and the metal shell are not used for grounding, the weight and the manufacturing cost are reduced, the situation of galvanic corrosion at the joint of the metal connector and the metal shell can not occur, and the grounding reliability is high. Meanwhile, the ground electrode 22 is arranged on the flow tube 20, and the installation mode can refer to the installation mode of the detection electrode, so that the method is simple and easy to realize. In order to better realize the detection of the induced voltage by the detection electrode 21, referring to fig. 1, 4 and 5, in the embodiment of the present invention, a first electrode plate 40, a second electrode plate 41 and an electrical connector 42 are further disposed in the main body 10. One of the pair of detection electrodes 21 is electrically connected to the first electrode plate 40, and the other is electrically connected to the second electrode plate 41. The ground electrode 22 is electrically connected to the first electrode plate 40 or the second electrode plate 41. The electric connector 42 bypasses the magnetic field formed by the electromagnet 30 and is electrically connected to the first electrode plate 40 and the second electrode plate 41, respectively. One end of the detection electrode 21 stretches into the flow pipe 20 to be in contact with fluid, the other end of the detection electrode is connected with the first electrode plate 40 or the second electrode plate 41, and the first electrode plate 40 and the second electrode plate 41 are connected through an electric connecting piece 42, so that a signal detection loop is formed by the detection electrode 21, the first electrode plate 40, the electric connecting piece 42, the second electrode plate 41 and the detection electrode 21, and detection of induced voltage by the detection electrode 21 is better realized. The electrical connection 42 bypasses the magnetic field created by the electromagnet 30 to avoid interference from alternating magnetic fields.

Meanwhile, one end of the ground electrode 22 is extended into the flow tube 20 to contact with fluid, and the other end is connected with the first electrode plate 40 or the second electrode plate 41, and the ground electrode 22 is used for realizing the grounding of the first electrode plate 40 or the second electrode plate 41, so that the grounding path is short, and the anti-interference capability is improved.

In the embodiment of the present invention, one possible connection manner of the detection electrode 21 and the flow tube 20 is that one end of the detection electrode 21 is connected to the first electrode plate 40 or the second electrode plate 41. In an embodiment of the present invention, the detection electrode 21 includes, but is not limited to, being made of a corrosion-resistant metal material, such as stainless steel, titanium alloy, or the like. For the dismouting of convenient detection electrode 21, can adopt clearance fit between detection electrode 21 and the detection mounting hole, the cover has the sealing washer on the detection electrode 21, and the sealing washer is radial sealing washer, compares the terminal surface seal, and the terminal surface of detection electrode 21 need not too big clamp force and can guarantee sealed effect. The detection electrode 21 and the first electrode plate 40 or the second electrode plate 41 can be connected through screws, or the detection electrode 21 and the first electrode plate 40 or the second electrode plate 41 can be welded, for example, the end face of the detection electrode 21 is tightly contacted with the first electrode plate 40 or the second electrode plate 41, electrode holes are formed in the first electrode plate 40 or the second electrode plate 41, conductive copper sheets are arranged around the electrode holes, the detection electrode 21 extends into the electrode holes, and the first electrode plate 40 or the second electrode plate 41 is connected with the circuit board through soldering. Further, in order to improve the solderability of the detection electrode 21, the surface of the detection electrode 21 may be tinned in advance. The first electrode plate 40 and the second electrode plate 41 can be made of hard circuit boards, can act as electrode pressing sheets, directly press the detection electrode 21, and avoid adding additional electrode pressing sheets and screws, thereby saving the electrode pressing sheets and screws, reducing the material and assembly cost, and enabling the structure of the electromagnetic flowmeter to be more compact.

In the embodiment of the present invention, the connection mode of the ground electrode 22 and the flow tube 20 may refer to the connection mode of the detection electrode 21 and the flow tube 20. One possible way to connect the ground electrode 22 to the flow tube 20 is to provide a ground mounting hole in the flow tube 20. The ground electrode 22 has a multi-stage columnar structure, and one end portion of the ground electrode 22 extends into the ground mounting hole, and the other end is connected to the first electrode plate 40 or the second electrode plate 41. Further, to prevent fluid within the flow tube 20 from escaping through the ground mounting hole, a second sealing structure is provided on the ground electrode 22 that seals the gap between the ground electrode 22 and the ground mounting hole. The second sealing structure includes, but is not limited to, a seal ring.

In an embodiment of the present invention, the ground electrode 22 includes, but is not limited to, being fabricated from a corrosion resistant metallic material, such as stainless steel, titanium alloy, or the like. In order to facilitate the disassembly and assembly of the grounding electrode 22, clearance fit can be adopted between the grounding electrode 22 and the grounding installation hole, a sealing ring is sleeved on the grounding electrode 22, the sealing ring is a radial sealing ring, and compared with end face sealing, the sealing effect can be ensured without too large pressing force on the end face of the grounding electrode 22. The ground electrode 22 and the first electrode plate 40 or the second electrode plate 41 may be connected by screws, or the ground electrode 22 and the first electrode plate 40 or the second electrode plate 41 may be welded.

Referring to fig. 5 and 6, in order to avoid the impact on the electrical connector 42 when the electromagnetic flowmeter vibrates, in the embodiment of the present invention, the shock absorbing member 43 is disposed on the electrical connector 42, and the shock absorbing member 43 prevents the vibration of the electrical connector 42. The shock absorbing member 43 includes, but is not limited to, shock absorbing foam, which may be adhered to the electrical connection member 42 while being connected to other components. When the electromagnetic flowmeter vibrates, the influence of vibration on the electric connector 42 can be relieved through the buffering effect of the shock absorber 43, so that signal transmission of the electric connector 42 is ensured, and electromagnetic interference caused by vibration of the electric connector 42 is prevented. The damper 43 may be provided around the vicinity of the electric connector 42 instead of on the electric connector 42, thereby preventing the electric connector 42 from vibrating to generate electromagnetic interference.

In the above embodiment, in order to process the signal of the detection electrode 21, it is necessary to connect the detection electrode 21 with an external processing device, and one possible way is to connect the detection electrode 21 with an external processing device through the first electrode plate 40 or the second electrode plate 41, so that the signal of the detection electrode 21 is processed by the external processing device, for example, the induced voltage of the detection electrode 21 is amplified, filtered, shaped by a converter, and sent to the MCU (Microcontroller Unit, micro control unit) to complete the display and output control of the instantaneous flow and the accumulated flow.

Further, in order to avoid signal transmission with an external processing unit, the transmission path is too long, which results in signal attenuation. With continued reference to fig. 1 and 4-6, in one possible embodiment of the present invention, a motherboard 44 is also provided within the body 10. The main board 44 is electrically connected to the electromagnet 30, and is electrically connected to the first electrode plate 40 or the second electrode plate 41. The main board 44 is provided with a quick connector 45, and the quick connector 45 extends outwards through an electrical connector on the main body 10. The main board 44 is provided with a power supply unit, a signal processing unit and an arithmetic unit, wherein the power supply unit can supply power to the electromagnet 30, the signal processing unit is used for amplifying, filtering and shaping the induced voltage of the detection electrode 21, and the arithmetic unit can calculate the flow rate of the fluid in the flow tube 20 through the induced voltage detected by the detection electrode 21. One possible implementation of the quick connector 45 is a pin, which is used for connecting the electromagnetic flowmeter with an external processing device, and can transmit the signal processed by the motherboard 44 to the processing device.

For example, referring to fig. 5 and 6, in one possible embodiment of the present invention, the electrical connection 42 may be implemented by an FPC (Flexible Printed Circuit, flexible circuit board) that bypasses the magnetic field formed by the electromagnet 30, ensuring that the signal detection loop plane is parallel to the magnetic field direction and thus not disturbed by the alternating magnetic field. The detection electrode 21 and the first electrode plate 40 or the second electrode plate 41 may be connected by a compression screw. The first electrode plate 40 is electrically connected to the main board 44 through a connector. The detection electrode is connected with the first electrode plate and the second electrode plate to form a detection circuit, and the signal is relatively weak. The power supply signal and the processing circuit are arranged on the main board, the signals are relatively strong, and the interference of strong signals on weak signals is avoided, so that the detection accuracy is ensured.

In the embodiment of the present invention, when the conductive fluid passes through the flow tube 20, that is, when the conductive fluid cuts magnetic lines of force to generate induced voltage, the fluid itself is used as zero potential, and at this time, a positive potential is generated on one detection electrode 21, and a negative potential is generated on the other detection electrode 21, so that the induced voltage is continuously changed. Thus, the main board 44 needs to be at zero potential and conductive with the conductive fluid so as to form a symmetrical input loop. Since the output induced voltage of the detection electrode 21 is small, it is usually only a few millivolts. In order to improve the anti-interference capability of the electromagnetic flowmeter, the zero potential in the input loop must be grounded, and the ground potential is zero potential. If the external interference signal is caused by poor or no grounding, the error occurs in the main board 44 receiving the induction power of the detection electrode 21, and the error reporting form is as follows: empty pipe, zero signal or negative signal.

In the embodiment of the invention, the grounding electrode 22 is connected with the first electrode plate 40 or the second electrode plate 41, and a grounding loop of the electromagnetic flowmeter is formed by the grounding electrode 22 at one end of the flow tube close to the inlet, namely the grounding electrode 22 at one end of the flow tube close to the outlet (the first electrode plate 40 or the second electrode plate 41). The conductive fluid contacts the ground electrode 22, and the ground electrode 22 is connected to the first electrode plate 40 or the second electrode plate 41, thereby realizing the flow of the ground current and the grounding of the electrode plates.

With continued reference to fig. 3, in an embodiment of the present invention, one way in which electromagnet 30 may be implemented is that electromagnet 30 includes: support frame 31, iron core 32, coil 33 and shock attenuation preforming 34. The support 31 includes a support column and limiting plates disposed at opposite ends of the support column, and the support column has a through cavity. The core 32 is disposed within the interior cavity of the support column. The coil 33 is wound around the outer surface of the support post and is located between the two limiting plates. Wherein the support frame 31 is used to provide support for the coil 33, the diameter of the inner cavity of the support column is matched with the outer diameter of the core 32, and the "matching" herein means that the diameter of the inner cavity of the support column may be slightly larger or slightly smaller than the outer diameter of the core 32. When the diameter of the inner cavity of the support column is slightly larger than the outer diameter of the iron core 32, the iron core 32 can be connected in the inner cavity of the support column in a bonding, welding, clamping and other modes. When the diameter of the inner cavity of the support column is slightly smaller than the outer diameter of the iron core 32, the iron core 32 can be extruded into the inner cavity of the support column, the inner cavity of the support column is in interference connection with the iron core 32, and the inner cavities of the iron core 32 and the support column are connected in a bonding, welding, clamping mode and the like mode for ensuring the connection strength. The coil 33 is disposed between the two limiting plates. Through the limiting plates at the opposite ends of the support column, the coil 33 can be limited along the axial direction of the coil 33, and the coil 33 is prevented from moving axially on the support column.

In order to prevent the magnetic field fluctuation caused by the vibration of the coil 33, the electromagnet 30 is further provided with a damping presser piece 34, and the damping presser piece 34 is made of rubber material or silica gel material. The shock absorbing presser pieces 34 are arranged in such a manner that the shock absorbing presser pieces 34 are respectively connected with the limiting plate and the main body 10. Alternatively, the shock absorbing pads 34 are connected to the limiting plate and the flow tube 20, respectively. It should be noted that the above two modes may be implemented separately or may be implemented in combination, which is not limited herein. The supporting frame 31 can be extruded through the damping pressing sheet 34, and when the supporting frame 31 vibrates, the damping pressing sheet 34 can prevent the supporting frame 31 from moving, so that magnetic field fluctuation caused by vibration of the coil 33 is prevented. Further, the damping presser piece 34 may be disposed between the coil 33 and the limiting plate to prevent the coil 33 from moving relative to the support column due to vibration. Further, the damping press piece 34 can also extend into the inner cavity of the support column to press the iron core 32, so as to prevent the iron core 32 from moving relative to the support column due to vibration.

Further, in the embodiment of the present invention, in order to restrict the magnetic field direction of the electromagnet 30, reduce magnetic leakage, and prevent the external magnetic field from interfering with the electromagnet 30, a yoke plate or a yoke housing is further disposed on the electromagnet 30. Wherein the yoke plate or yoke shell includes, but is not limited to, being made of silicon steel sheet. The arrangement of the yoke plate or yoke housing may be set according to different arrangements of the electromagnet 30. In the embodiment of the present invention, the number of the flow tubes is at least one, and when the number of the flow tubes is different, the electromagnet 30 is arranged in different ways in order to ensure that one side of each flow tube is adjacent to the electromagnet.

Taking two flow tubes 20 as an example, one implementation is that there are two flow tubes 20 and two electromagnets 30, and two flow tubes 20 are located between the two electromagnets 30. The side of the electromagnet 30 facing away from the flow tube 20 is provided with a yoke plate. Alternatively, the electromagnet 30 is disposed within a yoke housing having a flux opening at an end of the yoke housing facing the flow tube 20. When the electromagnet 30 is in use, the orientation of the iron core 32 is the orientation of the magnetic field of the electromagnet 30. To achieve the flow tube 20 in a magnetic field, one end of the core 32 is required to face the flow tube 20, the other end faces away from the flow tube 20, and the end of the electromagnet 30 facing away from the flow tube 20 is the end of the core 32 facing away from the flow tube 20. The magnetic field direction of the electromagnet 30 can be restrained through the magnetic yoke plate, so that magnetic leakage is reduced, and meanwhile, the electromagnet 30 is prevented from being disturbed by an external magnetic field. In addition to the use of the yoke plate 35 to prevent leakage, a yoke housing may be used, which is wrapped around the outer surface of the electromagnet 30 to prevent leakage of the magnetic field generated after the coil 33 is energized.

Taking four flow tubes 20 as an example, four flow tubes 20 are shown in fig. 1 to 6. One way to achieve this is that, referring to fig. 3, the flow tubes 20 are four, with every two flow tubes 20 forming a flow tube set. The number of electromagnets 30 is two. An electromagnet 30 is disposed between two flow tubes 20 in each flow tube set. The electromagnet 30 is disposed within a yoke housing having flux ports at its ends facing the flow tube 20. The electromagnet 30 can carry out magnetic field outward through the magnetic flux ports at the two ends of the magnetic yoke shell, so that the flow tubes 20 at the two ends are positioned in the magnetic field, the magnetic fields of the two flow tubes 20 are provided by the same electromagnet 30 and are symmetrical, and the problem of inconsistent magnetic fields is avoided. Meanwhile, the yoke housing is wrapped on the outer surface of the electromagnet 30, so that leakage of a magnetic field generated after the coil 33 is electrified can be prevented.

Further, in the embodiment of the present invention, when the electromagnetic flowmeter is used, no matter how many flow pipes 20 are, the conductive fluid enters the same water tank into different flow pipes 20, so no matter how many flow pipes 20 are, the conductive fluid can be communicated with the outside through the same inlet connector. Taking the flow tube 20 as four examples, referring to fig. 1-3, one possible way is to further include a water dividing fitting 23. The water diversion joint 23 is connected with the inlet of the main body 10, a diversion cone 24 is arranged in the water diversion joint 23, the diversion cone 24 divides the inner cavity of the water diversion joint 23 into two water diversion channels, and each water diversion channel is respectively communicated with one flow tube group. The conductive fluid at the inlet can be respectively led into different water diversion channels through the diversion cone 24, and the conductive fluid entering the water diversion channels can further respectively enter different flow pipes 20.

Further, when the flow tube 20 is implemented by means of a flow tube body, referring to fig. 7 and 8, the guide cone 24 may also be provided on the flow tube body, and disposed corresponding to the water inlet position of the water diversion joint.

Further, to ensure that the conductive fluid smoothly enters each flow tube 20, referring to fig. 3, 7 and 8, the end of the flow tube 20 facing the water diversion channel is provided with a guiding curved surface 25. Depending on the distance between the flow tube 20 and the flow cone 24, the curvature of the guide curve 25 may vary, and one way to achieve this is to have a smaller curvature of the guide curve 25 on the flow tube 20 closer to the flow cone 24.

Further, in order to integrate the four flow tubes 20 into one body, the electromagnetic flowmeter of the present invention further includes a fixing plate 26, see fig. 1, 3 and 6. A fixing plate 26 is located between the water diversion joint 23 and the end face of the inlet. Four flow tubes 20 are secured to the fixed plate 26 and communicate with the water diversion channels through the fixed plate 26. When the flow tube 20 is implemented by means of a flow tube body, referring to fig. 7 and 8, the fixing plate 26 may also be provided on the flow tube body.

With continued reference to fig. 1 and 3, an outlet connector 27 is provided at an end of each flow tube 20 adjacent to the outlet, and the outlet connector 27 is connected to the main body 10. Communication between the flow tube 20 and the outside is achieved by the outlet connection 27, from which outlet connection 27 fluid flows out of the flow tube 20.

In one possible embodiment of the invention, the outlet connector 27 comprises a flange connector and a connector nut. The flange joint is detachably connected to the main body 10 and communicates with the corresponding flow tube 20. Alternatively, the flange joint is integrally formed with the flow tube 20. The joint nut is sleeved outside the flange joint and is detachably connected with the flange joint. When the flange joint is detachably connected to the main body 10, the flange joint may be connected to the main body 10 by a fastener such as a screw. A sealing ring is provided at the junction of the flange joint and the flow tube 20 to prevent fluid from overflowing the flow tube 20 from the junction of the flange joint and the flow tube 20. The flange joint and the joint nut are provided with threads which are matched with each other for use, and the joint nut can be connected to the flange joint in a screwed manner. The connection between the flange joint and the external pipeline can be realized through the joint nut, and one realizable mode is that the joint nut is sleeved on the external pipeline, then the external pipeline is connected with the flange joint, and then the joint nut is connected on the flange joint. When the joint nut is connected to the flange joint, the joint nut presses the external pipeline, thereby fixing the external pipeline to the flange joint.

Taking four flow tubes 20 as an example, the number of flow tubes 20 is large, and if the detection electrodes 21 on the flow tubes 20 form a signal loop through one electrical connection 42, the detection accuracy is affected due to the difference in detection loop length. To avoid this, referring to fig. 1, 5, 9 and 10, in one embodiment of the present invention, one of the pair of detection electrodes 21 of the two flow tube sets is connected to the same first electrode plate 40. The other detection electrode 21 is connected to the second electrode plate 41, wherein the second electrode plate 41 to which the other detection electrode 21 located in a different flow tube group is connected is different. The different second electrode plates 41 are connected to the same first electrode plate 40 through different electrical connectors 42, respectively. In this way, the first electrode plate 40 is used for being connected with the main board 44, the second electrode plate 41 is divided into two pieces, the two pieces of second electrode plate 41 are respectively connected with the first electrode plate 40 through different electrical connectors 42, the first electrode plate 40 is connected with the main board 44 through connectors, and the connectors are arranged at the middle position of the first electrode plate 40. In this arrangement, the detection loop lengths of the detection electrodes 21 in the different flow tube groups are not greatly different and are approximately equal, so that the detection accuracy can be effectively improved.

One of the two flow tube sets is connected to the first electrode plate 40, and the other one of the pair of detection electrodes 21 is connected to the second electrode plate 41, wherein the first electrode plate 40 and the second electrode plate 41 connected to the detection electrodes 21 in the different flow tube sets are different. The first electrode plate 40 and the second electrode plate 41 connected to the detection electrode 21 in the same flow tube group are connected by an electrical connector 42. In this way, the first electrode plate 40 is used for being connected to the main board 44, the first electrode plate 40 is divided into two pieces, the second electrode plate 41 is also divided into two pieces, and the two second electrode plates 41 are respectively connected to the corresponding first electrode plates 40 through different electrical connectors 42. The two first electrode plates 40 are connected with the main board 44 through connectors, and the connectors are arranged at the middle positions of the two first electrode plates 40. In this arrangement, the detection loop lengths of the detection electrodes 21 in the different flow tube groups are not greatly different and are approximately equal, so that the detection accuracy can be effectively improved.

Further, referring to fig. 1 to 4, in one embodiment of the present invention, there is provided an electromagnetic flowmeter comprising: a main body 10, a flow tube 20 and an electromagnet 30.

Wherein the body 10 has an inlet and an outlet. The flow tube 20 is provided in the main body 10, and the flow tube 20 communicates with the outside through an inlet and an outlet. The flow tube 20 is provided with a pair of detection electrodes 21, and the end of the flow tube 20 near the inlet and the end near the outlet are provided with grounding electrodes 22. The electromagnet 30 is disposed within the body 10, with one side of the flow tube 20 adjacent the electromagnet 30.

Wherein the flow tube 20 is provided with a detection mounting hole. The detection electrode 21 has a multi-segment columnar structure, and one end portion of the detection electrode 21 extends into the detection mounting hole. The detection electrode 21 is provided with a first sealing structure, and the first sealing structure seals a gap between the detection electrode 21 and the detection mounting hole.

In the embodiments of the present invention, under the condition that the structures do not conflict, features in the following embodiments and the above-described embodiments may be combined and referred to each other, and will not be described herein again. When the detection electrode 21 is connected, one end portion of the detection electrode 21 extends into the detection mounting hole, and the other end is connected to the first electrode plate 40 or the second electrode plate 41. To prevent fluid within the flow tube 20 from escaping through the sensing mounting hole, the gap between the sensing electrode 21 and the sensing mounting hole is sealed by a first sealing structure, including but not limited to a seal ring.

For example, when the flow tube 20 is one, the electromagnet 30 may be one, with one end of the electromagnet 30 facing the flow tube 20 and one end facing away from the flow tube 20. One end facing the flow tube 20 provides a magnetic field to the flow tube 20 and one end facing away from the flow tube 20 is provided with a yoke plate. Alternatively, the electromagnet 30 is disposed within a yoke housing having a flux opening at an end of the yoke housing facing the flow tube 20. When the electromagnet 30 is in use, the orientation of the iron core 32 is the orientation of the magnetic field of the electromagnet 30. To achieve the flow tube 20 in a magnetic field, one end of the core 32 is required to face the flow tube 20, the other end faces away from the flow tube 20, and the end of the electromagnet 30 facing away from the flow tube 20 is the end of the core 32 facing away from the flow tube 20. The magnetic field direction of the electromagnet 30 can be restrained through the magnetic yoke plate, so that magnetic leakage is reduced, and meanwhile, the electromagnet 30 is prevented from being disturbed by an external magnetic field. In addition to the use of the yoke plate 35 to prevent leakage, a yoke housing may be used, which is wrapped around the outer surface of the electromagnet 30 to prevent leakage of the magnetic field generated after the coil 33 is energized.

Taking two flow tubes 20 as an example, one implementation is that there are two flow tubes 20 and two electromagnets 30, and two flow tubes 20 are located between the two electromagnets 30. The side of the electromagnet 30 facing away from the flow tube 20 is provided with a yoke plate. Alternatively, the electromagnet 30 is disposed within a yoke housing having a flux opening at an end of the yoke housing facing the flow tube 20.

Alternatively, two flow tubes 20 may be provided, one electromagnet 30, with one electromagnet 30 positioned between the two flow tubes 20. The electromagnet 30 is disposed within a yoke housing having flux ports at its ends facing the flow tube 20. The electromagnet 30 can carry out magnetic field outward through the magnetic flux ports at the two ends of the magnetic yoke shell, so that the flow tubes 20 at the two ends are positioned in the magnetic field, the magnetic fields of the two flow tubes 20 are provided by the same electromagnet 30 and are symmetrical, and the problem of inconsistent magnetic fields is avoided. Meanwhile, the yoke housing is wrapped on the outer surface of the electromagnet 30, so that leakage of a magnetic field generated after the coil 33 is electrified can be prevented.

Example 2

On the basis of embodiment 1, referring to fig. 11 and fig. 12 correspondingly, an embodiment of the present invention further provides a spraying system, including: electromagnetic flowmeter 50, water tank 60, pump 70 and spray device 80. The electromagnetic flowmeter 50 can be realized by the electromagnetic flowmeter described in embodiment 1 described above.

Specifically, referring to fig. 11 and 12, the spray system includes: electromagnetic flowmeter 50, water tank 60, pump 70 and spray device 80.

The electromagnetic flowmeter 50 includes: a main body 10, a flow tube 20 and an electromagnet 30. The body 10 has an inlet and an outlet. The flow tube 20 is provided in the main body 10, and the flow tube 20 communicates with the outside through an inlet and an outlet. The flow tube 20 is provided with a pair of detection electrodes 21, and the end of the flow tube 20 near the inlet and the end near the outlet are provided with grounding electrodes 22. The electromagnet 30 is disposed within the body 10, with one side of the flow tube 20 adjacent the electromagnet 30. The water tank 60 is connected to the flow tube 20 through an inlet. The pump 70 is connected to the flow tube 20 through an outlet. The shower device 80 is connected to the pump 70.

For example, the electromagnetic flowmeter 50 has four flow pipes 20, and the pump 70 has four pumps. Four flow tubes 20 are connected to the water tank 60 through inlets, respectively, each flow tube is connected to four pumps 70 through outlets, respectively, each pump 70 is connected to at least one spray device 80, respectively. In use, the plurality of spraying devices 80 are symmetrically arranged left and right, two pumps 70 are responsible for the left spraying, and the other two pumps 70 are responsible for the right spraying. The four flow pipes in the electromagnetic flowmeter 50 correspondingly monitor the flow of the two pumps 70 on the left side of spraying and the flow of the two pumps 70 on the right side of spraying, so as to ensure that the spraying is uniform on the left and right sides of the machine body.

The technical scheme provided by the embodiment of the invention is that the spraying system comprises, but is not limited to, equipment which can be used for agricultural plant protection unmanned aerial vehicles, pesticide spraying vehicles, manual spraying devices, greening spraying equipment and the like. The electromagnetic flowmeter 50 is grounded through the grounding electrode 22, and compared with the prior art, the electromagnetic flowmeter has the advantages of short grounding path, strong anti-interference capability, no need of grounding by using a metal connector and a metal shell, weight and manufacturing cost reduction, no occurrence of galvanic corrosion at the joint of the metal connector and the metal shell, and high grounding reliability. Meanwhile, the ground electrode 22 is arranged on the flow tube 20, and the installation mode can refer to the installation mode of the detection electrode 21, so that the method is simple and easy to realize.

Example 3

On the basis of embodiment 1 and embodiment 2, correspondingly, referring to fig. 11 and fig. 12, an embodiment of the present invention further provides an unmanned aerial vehicle, including: unmanned aerial vehicle body 90 and set up the sprinkler system on unmanned aerial vehicle body 90. The sprinkling system can be realized by the sprinkling system described in the above-described embodiment 2, and the electromagnetic flowmeter 50 in the sprinkling system can be realized by the electromagnetic flowmeters in the embodiments 1 and 2.

Specifically, referring to fig. 11 and 12, the unmanned aerial vehicle includes: unmanned aerial vehicle body 90 and set up the sprinkler system on unmanned aerial vehicle body 90.

The spraying system comprises: electromagnetic flowmeter 50, water tank 60, pump 70, and a plurality of showers 80. The electromagnetic flowmeter 50 includes: a main body 10, a flow tube 20 and an electromagnet 30. The body 10 has an inlet and an outlet. The flow tube 20 is provided in the main body 10, and the flow tube 20 communicates with the outside through an inlet and an outlet. The flow tube 20 is provided with a pair of detection electrodes 21, and the end of the flow tube 20 near the inlet and the end near the outlet are provided with grounding electrodes 22. The electromagnet 30 is disposed within the body 10, with one side of the flow tube 20 adjacent the electromagnet 30. The water tank 60 is connected to the flow tube 20 through an inlet. The pump 70 is connected to the flow tube 20 through an outlet. A plurality of spray devices 80 are connected to the pump 70.

Referring to fig. 11, taking two flow pipes 20 as an example, the number of flow pipes 20 is two, each flow pipe 20 is connected to at least two pumps 70 through an outlet, and each pump 70 is connected to at least one spraying device 80. Spray device 80 includes, but is not limited to, a spray head. As shown in fig. 11, the unmanned aerial vehicle is configured with 4 pumps 70, i.e., (1) (2) (3) (4) pumps 70 in fig. 11. Each pump 70 is connected with two spraying devices 80, namely (1) the pump 70 is connected with two spray heads a and b, (2) the pump 70 is connected with two spray heads c and d, (3) the pump 70 is connected with two spray heads h and g, and (4) the pump 70 is connected with two spray heads e and f. To ensure the spray uniformity of the left and right sides of the unmanned aerial vehicle body 90, the plurality of spray devices 80 are symmetrically distributed on both sides of the unmanned aerial vehicle body 90 along the first axis 91. The showers 80 on the same side communicate with the same flow tube 20 with respect to the first axis 91. As shown in fig. 11, the extending direction of the first axis 91 is the longitudinal direction of the unmanned aerial vehicle. I.e. a, b, c, d four spray heads and e, f, g, h four spray heads are symmetrically distributed along the first axis 91. In most cases, only two pumps 70 are operated, one being responsible for the left hand spraying of the unmanned aerial vehicle body 90 and one being responsible for the right hand spraying of the unmanned aerial vehicle body 90, each pump 70 monitoring the flow of one pump 70 through one flow tube 20, an electromagnetic flowmeter 50 with two flow tubes 20 being sufficient to meet the operational requirements. When needs large-traffic spraying, four pumps just can open fully, and wherein two pumps 70 are responsible for unmanned aerial vehicle body 90 left side's spraying, and two other pumps 70 are responsible for unmanned aerial vehicle body 90 right side's spraying. At this time, there is still a requirement for flow uniformity of the left and right sides of the unmanned aerial vehicle body 90, one flow tube 20 of the electromagnetic flowmeter 50 is used for monitoring flow of the two pumps 70 on the left side of the spray, and the other flow tube 20 is used for monitoring flow of the two pumps 70 on the right side of the spray, so as to ensure that the left and right sprays of the unmanned aerial vehicle body 90 are uniform.

Further, when the pump 70 on the same side is different, and the flow rates of the pump on the same side are different, in order to ensure the spray uniformity of the left and right sides of the unmanned aerial vehicle body 90, in the embodiment of the present invention, the spraying devices 80 on the same side are symmetrically distributed along the second axis 92 of the unmanned aerial vehicle body 90. The second axis 92 extends in the width direction of the unmanned aerial vehicle. Because the unmanned aerial vehicle sprays when flying back and forth, even if the front and back flow is different, the dosage sprayed on crops is the sum of the front and back pump 70 flow, and the flow on the left side and the right side is still consistent. Meanwhile, the situation that the spraying is missed or the protection is not in place can be avoided.

Taking four flow tubes 20 as an example, the number of flow tubes 20 is four, each flow tube 20 is connected with at least one pump 70 through an outlet, and each pump 70 is connected with at least one spraying device 80. When the four pumps 70 start to work, two pumps 70 are responsible for the spraying on the left side of the unmanned aerial vehicle body 90, and the other two pumps 70 are responsible for the spraying on the right side of the unmanned aerial vehicle body 90. The four flow pipes 20 in the electromagnetic flowmeter 50 correspondingly monitor the flow of the two pumps 70 on the left side of spraying and the flow of the two pumps 70 on the right side of spraying, so as to ensure that the unmanned aerial vehicle body 90 sprays evenly left and right.

In order to facilitate the control of the electromagnetic flowmeter 50 on the unmanned aerial vehicle, in the embodiment of the present invention, the unmanned aerial vehicle body 90 is further provided with a controller and a control switch coupled with the controller. The controller and the control switch may be disposed inside the unmanned aerial vehicle body 90, and thus, are not shown in the drawings. The control switch is coupled to the electromagnetic flowmeter 50, and the controller controls the operating state of the electromagnetic flowmeter 50 through the control switch. The electromagnetic flowmeter 50 can be controlled by a user through the controller, so that the flow of the spraying system can be detected by the user conveniently, and the spraying efficiency of the unmanned aerial vehicle is improved.

Still further, in one embodiment of the present invention, a controller is coupled to the pump 70, and the controller controls the operation state of the electromagnetic flowmeter 50 by controlling the switch according to the operation state of the pump 70. The controller may monitor the operation of the pump 70 and if the pump 70 is activated, indicating that a spraying operation is required, the controller may control the operation of the electromagnetic flowmeter 50 to detect the flow of fluid during the spraying operation. If the pump 70 is stopped, indicating that the spraying operation is completed, the controller may control the electromagnetic flowmeter 50 to operate and stop. The control process can be completed in the flight process of the unmanned aerial vehicle, the flow can be accurately detected at the spraying starting point, and the flow detection is finished at the spraying end point, so that the sprayed medicine quantity is accurately obtained, and the statistical operation area is more accurate.

The controller controls the operation state of the electromagnetic flowmeter 50 by a control switch according to the operation state of the pump 70, and is an automatic control mode of the electromagnetic flowmeter 50. In the embodiment of the present invention, a manual control manner of the electromagnetic flowmeter 50 is also provided, which is specifically as follows:

the unmanned aerial vehicle further comprises a ground control end, the ground control end is coupled with the controller, and the controller receives control signals of the ground control end and controls the working state of the electromagnetic flowmeter 50 through the control switch according to the control signals. The ground control terminal can remotely send a control signal to the controller, so that the controller controls the working state of the electromagnetic flowmeter 50 through the control switch according to the control signal. A user can control the controller on the unmanned aerial vehicle on the ground through the ground control end, and the unmanned aerial vehicle is not required to be stopped on the ground.

For example, the unmanned aerial vehicle flies above the farmland, and the user can send a control signal for starting the electromagnetic flowmeter 50 to the controller through the ground control end at this time, and the controller controls the electromagnetic flowmeter 50 to start according to the control signal at this time so as to detect the spraying flow rate when the unmanned aerial vehicle sprays the operation. When the spraying operation is completed, the user can send a control signal for closing the electromagnetic flowmeter 50 to the controller through the ground control end, and at the moment, the controller controls the switch to control the electromagnetic flowmeter 50 to be closed according to the control signal.

The technical solutions of the related spraying system and electromagnetic flowmeter described in embodiment 3 and the technical solutions described in embodiment 1 and embodiment 2 can be referred to each other and used for reference, and will not be described in detail here.

In summary, according to the technical scheme provided by the embodiment of the invention, the electromagnetic flowmeter is grounded through the grounding electrode, and compared with the traditional technology, the electromagnetic flowmeter has the advantages of short grounding path, strong anti-interference capability, no use of a metal connector and a metal shell for grounding, weight and manufacturing cost reduction, no occurrence of galvanic corrosion at the joint of the metal connector and the metal shell, and high grounding reliability. Meanwhile, the grounding electrode is arranged on the flow tube, and the installation mode can refer to the installation mode of the detection electrode, so that the method is simple and easy to realize.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electromagnetic flowmeter, comprising:

a main body having an inlet and an outlet;

a plurality of flow tubes provided in the main body, the plurality of flow tubes communicating with the outside through the inlet and the outlet; a pair of detection electrodes are arranged on each flow tube, and a grounding electrode is arranged at one end of each flow tube close to the inlet and one end of each flow tube close to the outlet;

wherein, one electromagnet is arranged between two adjacent flow pipes; the electromagnet is arranged in the magnetic yoke shell, and the two ends of the magnetic yoke shell, which face the flow tubes, are provided with magnetic flux openings, so that the two flow tubes are both positioned in the magnetic field.

2. The electromagnetic flowmeter of claim 1, wherein the main body is further provided with a first electrode plate, a second electrode plate and an electrical connector;

one of the pair of detection electrodes is electrically connected with the first electrode plate, and the other detection electrode is electrically connected with the second electrode plate;

the grounding electrode is electrically connected with the first electrode plate or the second electrode plate;

The electric connecting piece bypasses a magnetic field formed by the electromagnet and is respectively and electrically connected with the first electrode plate and the second electrode plate;

the flow tube is provided with a grounding mounting hole and a detection mounting hole; the grounding electrode is of a multi-section columnar structure, one end part of the grounding electrode extends into the detection mounting hole, and the other end of the grounding electrode is connected with the first electrode plate or the second electrode plate;

the grounding electrode is provided with a second sealing structure, and the second sealing structure seals a gap between the grounding electrode and the grounding mounting hole.

3. The electromagnetic flowmeter of claim 1, further comprising a water-splitting joint;

the water diversion joint is connected with the inlet of the main body, a diversion cone is arranged in the water diversion joint, the inner cavity of the water diversion joint is divided into two water diversion channels by the diversion cone, and each water diversion channel is respectively communicated with one flow tube group.

4. An electromagnetic flowmeter, comprising:

a main body having an inlet and an outlet;

A plurality of electromagnets disposed within said body, one side of said flow tube adjacent said electromagnets,

wherein each flow tube is provided with a detection mounting hole,

each detection electrode is of a multi-section columnar structure, and one end part of each detection electrode extends into the detection mounting hole;

a first sealing structure is arranged on each detection electrode, and seals a gap between the detection electrode and the detection mounting hole;

the water diversion connector is connected with the inlet of the main body, a flow guide cone is arranged in the water diversion connector, the inner cavity of the water diversion connector is divided into two water diversion channels by the flow guide cone, and each water diversion channel is respectively communicated with one flow tube group.

5. The electromagnetic flowmeter of claim 4, wherein the main body is further provided with a first electrode plate, a second electrode plate and an electrical connector;

The electric connecting piece bypasses a magnetic field formed by the electromagnet and is respectively and electrically connected with the first electrode plate and the second electrode plate.

6. The electromagnetic flowmeter of claim 5, wherein the electrical connection member is provided with a damper member by which the electrical connection member is prevented from vibrating.

7. The electromagnetic flowmeter of claim 5, wherein a main board is further provided in the main body;

the main board is electrically connected with the electromagnet and the first electrode plate or the second electrode plate;

the main board is provided with a quick plug-in interface which extends outwards through an electrical connection port on the main body;

one end of the detection electrode is connected with the first electrode plate or the second electrode plate.

8. The electromagnetic flowmeter of claim 5 wherein the flow tube has a ground mounting hole disposed thereon; the grounding electrode is of a multi-section columnar structure, one end part of the grounding electrode extends into the detection mounting hole, and the other end of the grounding electrode is connected with the first electrode plate or the second electrode plate;

9. The electromagnetic flowmeter of claim 1 or 4, wherein the electromagnet comprises:

the support comprises a support column and limiting plates arranged at two opposite ends of the support column, and the support column is provided with a through cavity;

the iron core is arranged in the inner cavity of the supporting column;

the coil is wound on the outer surface of the support column and is positioned between the two limiting plates;

the damping pressing piece is respectively connected with the limiting plate and the main body; and/or

The damping pressing piece is respectively connected with the limiting plate and the flow tube.

10. An electromagnetic flowmeter according to claim 3 or 4, wherein the end of the flow tube facing the water diversion channel is provided with a guiding curved surface.

11. The electromagnetic flowmeter of claim 3 or 4, further comprising a fixed plate;

the fixing plate is positioned between the water diversion joint and the end face of the inlet;

the flow tube is fixed on the fixed plate and is communicated with the water diversion channel through the fixed plate.

12. The electromagnetic flowmeter of claim 1 or 4, wherein one of the pair of detection electrodes in two of the flow tube sets is connected to the same first electrode plate;

The other detection electrode is connected with a second electrode plate, wherein the second electrode plate connected with the other detection electrode in the different flow tube groups is different;

the different second electrode plates are respectively connected with the same first electrode plate through different electric connecting pieces;

or alternatively

One of the detection electrodes in the pair is connected with a first electrode plate, and the other detection electrode is connected with a second electrode plate, wherein the first electrode plate and the second electrode plate which are connected with the detection electrodes in different flow tube groups are different;

the first electrode plate and the second electrode plate which are connected with the detection electrode in the same flow tube group are connected through an electric connecting piece.

13. The electromagnetic flowmeter of claim 1 or 4, wherein an end of each of the flow tubes near the outlet is provided with an outlet connector in communication with the flow tube, the outlet connector being connected to the main body.

14. The electromagnetic flowmeter of claim 13, wherein the outlet connector comprises a flange connector and a connector nut;

The flange joint is detachably connected with the main body and is communicated with the corresponding flow pipe;

the joint nut is sleeved outside the flange joint and detachably connected with the flange joint.

15. A spray system, comprising:

the electromagnetic flowmeter of any of claims 1-14;

the water tank is connected with the flow pipe through the inlet;

the pump is connected with the flow pipe through the outlet;

and the spraying device is connected with the pump.

16. An unmanned aerial vehicle, comprising: the unmanned aerial vehicle body and set up the sprinkler system of claim 15 on the unmanned aerial vehicle body.

17. The unmanned aerial vehicle of claim 16, wherein there are two of the flow tubes, each of the flow tubes being connected to at least two of the pumps through the outlet, each of the pumps being connected to at least one of the spray devices;

the spraying devices are symmetrically distributed on two sides of the unmanned aerial vehicle body along the first axis;

the spraying devices positioned on the same side are communicated with the same flow pipe relative to the first axis;

The extending direction of the first axis is the length direction of the unmanned aerial vehicle.

18. The unmanned aerial vehicle of claim 17, wherein the spray devices on the same side are symmetrically distributed along a second axis of the unmanned aerial vehicle body;

the extending direction of the second axis is the width direction of the unmanned aerial vehicle.

19. The unmanned aerial vehicle of claim 16, wherein the number of flow tubes is four, each of the flow tubes being connected to at least one of the pumps through the outlet, each of the pumps being connected to at least one of the showers.

20. The unmanned aerial vehicle of claim 16, wherein the unmanned aerial vehicle body is further provided with a controller and a control switch coupled to the controller;

the control switch is coupled with the electromagnetic flowmeter, and the controller controls the working state of the electromagnetic flowmeter through the control switch.

21. The unmanned aerial vehicle of claim 20, wherein the controller is coupled to the pump, the controller controlling the operating state of the electromagnetic flowmeter via the control switch according to the operating state of the pump; or alternatively, the process may be performed,

The unmanned aerial vehicle further comprises a ground control end, the ground control end is coupled with the controller, and the controller receives a control signal of the ground control end and controls the working state of the electromagnetic flowmeter through the control switch according to the control signal.