WO2020107324A1 - Débitmètre électromagnétique et véhicule aérien sans pilote de protection de plante le comportant - Google Patents

Débitmètre électromagnétique et véhicule aérien sans pilote de protection de plante le comportant Download PDF

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Publication number
WO2020107324A1
WO2020107324A1 PCT/CN2018/118184 CN2018118184W WO2020107324A1 WO 2020107324 A1 WO2020107324 A1 WO 2020107324A1 CN 2018118184 W CN2018118184 W CN 2018118184W WO 2020107324 A1 WO2020107324 A1 WO 2020107324A1
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WO
WIPO (PCT)
Prior art keywords
electrode
electromagnetic flowmeter
bracket
side wall
pipe
Prior art date
Application number
PCT/CN2018/118184
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English (en)
Chinese (zh)
Inventor
黄稀荻
周乐
常子敬
孟祥�
潘国秀
Original Assignee
深圳市大疆创新科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 深圳市大疆创新科技有限公司 filed Critical 深圳市大疆创新科技有限公司
Priority to CN201880041248.9A priority Critical patent/CN110785637B/zh
Priority to PCT/CN2018/118184 priority patent/WO2020107324A1/fr
Publication of WO2020107324A1 publication Critical patent/WO2020107324A1/fr

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/56—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects
    • G01F1/58—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters
    • G01F1/588—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using electric or magnetic effects by electromagnetic flowmeters combined constructions of electrodes, coils or magnetic circuits, accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
    • B64D1/00—Dropping, ejecting, releasing, or receiving articles, liquids, or the like, in flight
    • B64D1/16—Dropping or releasing powdered, liquid, or gaseous matter, e.g. for fire-fighting
    • B64D1/18—Dropping or releasing powdered, liquid, or gaseous matter, e.g. for fire-fighting by spraying, e.g. insecticides

Definitions

  • the invention relates to the field of flow detection, in particular to an electromagnetic flowmeter and a plant protection drone with the electromagnetic flowmeter.
  • the electromagnetic flowmeter is an instrument that uses the principle of electromagnetic induction to measure the water flow according to the induced electromotive force generated by the conductor flowing through the external magnetic field. It is widely used in agricultural plant protection operations, food processing, industrial solvent filling and other scenarios.
  • an electromagnetic flow meter can be applied to a plant protection drone, and the spray flow rate and/or spray rate of the spray assembly can be detected by the electromagnetic flow meter.
  • Plant protection drones are very sensitive to load, and the existing electromagnetic flowmeters are limited in size, volume and weight, which is not conducive to the life of plant protection drones and also affects the installation of other components on plant protection drones.
  • the invention provides an electromagnetic flowmeter and a plant protection drone with the electromagnetic flowmeter.
  • an electromagnetic flowmeter including:
  • a pipe the pipe is provided on the bracket, and two open ends of the pipe are exposed outside the bracket;
  • Two electrodes two of the electrodes are disposed on opposite sides of the bracket, and the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, and can flow through the pipe
  • the liquid is in contact, and the detection ends of the two electrodes are arranged oppositely;
  • Two signal acquisition boards, two of the signal acquisition boards and two of the electrodes are correspondingly disposed on the same side of the bracket, and the signal acquisition board is used to acquire signals of the corresponding side electrodes;
  • Two coil assemblies the two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field
  • a control board which is electrically coupled to the two signal acquisition boards, and used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;
  • control board is integrated with one of the signal acquisition boards on the same circuit board.
  • a plant protection drone including:
  • Spraying assembly installed on the rack
  • a medicine box mounted on the rack;
  • An electromagnetic flowmeter for real-time detection of the spray flow of the spray assembly includes a bracket, a pipe, two electrodes, two signal acquisition boards, two coil assemblies, and a control board;
  • the duct is provided on the bracket, and two open ends of the duct are exposed outside the bracket, one of the open ends of the duct is communicated with the spraying assembly through a diversion tube, and the other open end is through a diversion
  • the tube is in communication with the medicine box;
  • the two electrodes are oppositely arranged on both sides of the bracket. After the detection ends of the two electrodes pass through the bracket and the side wall of the pipe, they can contact with the liquid flowing through the pipe. And the detection ends of the two electrodes are oppositely arranged;
  • Two of the signal acquisition boards and two of the electrodes are correspondingly arranged on the same side of the bracket, and the signal acquisition board is used to collect signals of the electrodes on the corresponding side;
  • the two coil assemblies are oppositely arranged on the other two sides of the bracket, and are used to generate an electromagnetic field
  • the control board is electrically coupled to the two signal acquisition boards, and is used to obtain the flow rate and/or velocity of the liquid flowing through the pipeline according to the signals collected by the two signal acquisition boards;
  • control board is integrated with one of the signal acquisition boards on the same circuit board.
  • the structural layout of the bracket, electrodes, signal acquisition board and coil assembly and the integrated arrangement of one of the signal acquisition board and the control board increase the compactness of the structure, thereby reducing The volume of the electromagnetic flowmeter and reduce the weight of the electromagnetic flowmeter.
  • FIG. 1 is an exploded view of the structure of an electromagnetic flowmeter in an embodiment of the invention
  • FIG. 2 is an exploded view of the electromagnetic flowmeter of the embodiment shown in FIG. 1 in another direction;
  • FIG. 3 is a perspective view of the electromagnetic flowmeter of the embodiment shown in FIG. 1;
  • FIG. 4 is a cross-sectional view of an electromagnetic flowmeter in an embodiment of the invention.
  • FIG. 5 is a partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 4;
  • FIG. 6 is a perspective view of an electrode in an embodiment of the invention.
  • FIG. 7 is a perspective view of an electrode fixing plate in an embodiment of the invention.
  • FIG. 8 is an assembly schematic diagram of a part of the structure of an electromagnetic flowmeter in an embodiment of the invention.
  • FIG. 9 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in another direction;
  • FIG. 10 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in yet another direction;
  • FIG. 11 is a schematic structural view of the electromagnetic flowmeter of the embodiment shown in FIG. 8 in yet another direction;
  • FIG. 12 is a schematic cross-sectional view of an electromagnetic flowmeter in an embodiment of the invention.
  • FIG. 13 is a partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 12;
  • FIG. 14 is another partial enlarged view of the electromagnetic flowmeter of the embodiment shown in FIG. 12;
  • 15 is a perspective view of a partial structure of an electromagnetic flowmeter in an embodiment of the invention.
  • 16 is a perspective view of a plant protection drone in an embodiment of the invention.
  • Second seal; 40 Second seal ring; 50: Third seal; 100: First pipe connector; 110: Third stepped part; 120: First mounting part; 200: Second pipe connector; 210: The fourth step portion; 220: second mounting portion; 300: electric plug; 400: conductive connector; 500: ground connector.
  • the electromagnetic flowmeter 4000 may include a bracket 1, a pipe 2, an electrode 3, a signal acquisition board 4 and a coil assembly 5.
  • the pipe 2 is provided on the bracket 1, and the two open ends of the pipe 2 are exposed outside the bracket 1.
  • the pipeline 2 in this embodiment is used for liquid (for example, when the electromagnetic flowmeter 4000 is applied to a plant protection drone, the liquid may be water or liquid pesticide), optionally, the pipeline 2 in this embodiment is a straight pipeline 2.
  • the two open ends of the pipe 2 are exposed from the two opposite side walls of the bracket 1 respectively.
  • the material of the pipe 2 is the same as the material of the bracket 1, and the pipe 2 and the bracket 1 are integrally formed.
  • the electrode 3 in this embodiment includes two electrodes.
  • the two electrodes 3 are oppositely arranged on both sides of the bracket 1. After the detection ends of the two electrodes 3 pass through the side walls of the bracket 1 and the pipe 2 respectively, The liquid is in contact, and the detection ends of the two electrodes 3 are arranged oppositely.
  • the signal collection board 4 also includes two.
  • the two signal collection boards 4 and the two electrodes 3 are correspondingly disposed on the same side of the bracket 1.
  • the signal collection board 4 is used to collect signals of the corresponding side electrodes 3.
  • the signal acquisition board 4 on each side collects the signal of the electrode 3 on the corresponding side, thereby reducing signal interference.
  • the signal collecting board 4 of this embodiment can amplify and filter the collected signal, thereby reducing the noise of the signal.
  • the signal collecting board 4 is provided with a differential circuit and the signal collecting board 4 The collected signal of the electrode 3 will remove common mode noise through the differential circuit.
  • the coil assembly 5 of this embodiment also includes two coil assemblies 5, which are disposed on the other two sides of the bracket 1 oppositely.
  • the two coil assemblies 5 are used to generate an electromagnetic field, which is an alternating magnetic field.
  • the electromagnetic field generated by the two coil assemblies 5 can pass through the pipe 2 and enter the pipe 2.
  • the difference between the induced electromotive forces of the two electrodes 3 will also change accordingly.
  • the structural layout of the support 1, the electrode 3, the signal acquisition board 4 and the coil assembly 5 of the embodiment of the present invention increases the compactness between the structures, thereby reducing the volume of the electromagnetic flowmeter 4000 and reducing the weight of the electromagnetic flowmeter 4000 .
  • the electromagnetic flowmeter 4000 further includes a control board 6, which is electrically coupled to the two signal acquisition boards 4, and the control board 6 can be based on the signals collected by the two signal acquisition boards 4. Obtain the flow rate and/or velocity of the liquid flowing through the pipe 2.
  • the control board 6 is integrated with one of the signal acquisition boards 4 on the same circuit board. The integrated arrangement of one of the signal acquisition boards 4 and the control board 6 in the embodiment of the present invention further increases the compactness of the structure. Thereby, the volume of the electromagnetic flowmeter 4000 is reduced, and the weight of the electromagnetic flowmeter 4000 is reduced.
  • control board 6 and one of the signal acquisition boards 4 are provided on the same side of the bracket 1, and the control board 6 and the signal acquisition board 4 on the same side are connected through fixed connections (such as screw or bolt threaded fasteners)
  • the fixed connection forms an integral structure to increase the compactness of the structure, thereby reducing the volume of the electromagnetic flowmeter 4000.
  • the function of the control board 6 is integrated on one of the signal acquisition boards 4 and the two signal acquisition boards 4 are electrically coupled and connected.
  • the signal acquisition board 4 integrated with the function of the control board 6 is used to The signals collected by the two signal acquisition boards 4 acquire the flow rate and/or velocity of the liquid flowing through the pipeline 2.
  • B is the magnetic field strength
  • U is the induced electromotive force generated by the two electrodes 3
  • A is the cross-sectional area of the pipe 2
  • d is the diameter of the pipe 2
  • k is the correction factor, and the liquid in the pipe 2 can be considered
  • the rate is not uniform and other factors to set the size of k, so as to reduce the error between the flow rate Q of the liquid flowing through the pipeline 2 calculated by formula (1) and the actual flow rate of the liquid flowing through the pipeline 2 .
  • k is about 0.8, for example, k may be 0.8 ⁇ 0.05.
  • the volume method (the volume of liquid flowing through the pipeline 2 within a certain period of time) can be used to calibrate the size of k.
  • the rate of the liquid flowing through the pipe 2 can be calculated according to the flow Q of the liquid flowing through the pipe 2.
  • the bracket 1 is made of plastic material, which is convenient for magnetic field penetration, and can reduce the weight of the electromagnetic flowmeter 4000.
  • the material of the bracket 1 is not limited to plastic, and other materials that are lighter in texture and easy to penetrate magnetic fields can be selected.
  • the bracket 1 may have a square shape such as a cube or a rectangular parallelepiped, or other regular shapes. Specifically, the shape of the bracket 1 may be designed according to needs.
  • the following embodiments further illustrate the structure of the electromagnetic flowmeter 4000 by taking the bracket 1 as a square as an example.
  • the bracket 1 may include a first side wall and a second side wall disposed oppositely, wherein one electrode 3 is provided on one side of the first side wall, and the other electrode 3 is provided on one side of the second side wall.
  • the first side wall and the second side wall are provided with electrode mounting holes 11 respectively, and the side wall of the pipe 2 is provided with a through hole corresponding to the position of the electrode mounting hole 11, and the electrode mounting hole 11 communicates with the corresponding through hole.
  • the outer side wall of the detection end of the electrode 3 abuts the side wall of the through hole.
  • the outer side wall of the detection end of the electrode 3 is not in abutting connection with the side wall of the through hole, but a sealing ring is provided between the detection end of the electrode 3 and the side wall of the through hole. It is a rubber sealing ring, and it can also be a sealing ring made of other materials.
  • the detection end of the electrode 3 is provided with a first stepped portion 33, and the side wall of the through hole is correspondingly provided with a second stepped portion (not shown), the first stepped portion 33 and the second The stepped portion abuts and fits, and the electrode 3 is limited by the second stepped portion to prevent the electrode 3 from being excessively installed.
  • the electromagnetic flowmeter 4000 is further provided with a first sealing ring 10 which is sleeved on the electrode 3, and the first sealing ring 10 is used to seal the electrode 3 with The gap between the side walls of the electrode mounting hole 11 further prevents the liquid in the pipe 2 from leaking.
  • a first sealing ring 10 is provided between each electrode 3 and the side wall of the corresponding electrode mounting hole 11.
  • the first sealing ring 10 may be a rubber sealing ring or a sealing ring made of other materials. The embodiment of the present invention does not specifically limit the material of the first sealing ring 10.
  • the side wall of the electrode 3 is provided with a boss 32
  • the side wall of the electrode mounting hole 11 is provided with a stepped surface
  • the boss 32 is in abutting connection with the stepped surface
  • the first seal ring 10 is provided at The side of the boss 32 away from the detection end of the electrode 3 is designed with such a structure to prevent liquid from leaking from the electrode mounting hole 11.
  • the electrode 3 includes a plurality of cylinders with different diameters.
  • the diameter of the portion between the detection end surface and the first step portion 33 on the electrode 3 is less than the diameter of the electrode 3 on the end surface of the first step portion 33
  • the tail end of the electrode 3 and the detection end of the electrode 3 are located at both ends of the electrode 3 respectively.
  • the electrode 3 can be taken out of the electrode mounting hole 11 to facilitate maintenance and replacement of the electrode 3.
  • the two electrodes 3 are arranged coaxially, that is, the detection ends of the two electrodes 3 are directly opposite. Further, the two coil assemblies 5 are also coaxially arranged. Optionally, the axial direction of the electrode 3 is perpendicular to the axial direction of the coil assembly 5.
  • the electromagnetic flowmeter 4000 may further include
  • the electrode fixing plate 7 includes two electrode fixing plates 7 in this embodiment.
  • the two electrode fixing plates 7 are used to respectively fix the two electrodes 3 on the corresponding side walls of the bracket 1.
  • the electrode fixing plate 7 is in contact with the electrode 3, and the electrode fixing plate 7 is installed on the side wall of the bracket 1 through a quick-release connection, thereby positioning the electrode 3 in the bracket 1.
  • the electrode fixing plate 7 cooperates with the quick release connector to position the electrode 3 in the bracket 1 to prevent the electrode 3 from falling; and, the quick fix piece is used to install the electrode fixing plate 7 on the bracket 1 and the electrode 3
  • the quick-release connector can be directly detached from the bracket 1, so that the electrode 3 can be quickly taken out, and the operation is convenient and quick.
  • the type of the quick release connector can be selected according to needs.
  • the quick release connector in this embodiment may include at least one of the following: threaded fasteners and snaps.
  • the threaded fasteners may be screws or bolts. It can be understood that the type of the quick release connector is not limited to this, and may be other quick release structures.
  • the electrode fixing plate 7 of this embodiment further includes a positioning hole 72.
  • a first positioning portion is provided at a corresponding position of the bracket 1, and the quick-release member passes through the setting hole 72 and is fixed on the first positioning portion.
  • the positioning holes 72 include a plurality, for example, the positioning holes 72 include two, and the two positioning holes 72 are provided on both sides of the first through hole 71, so as to more firmly fix the electrode fixing plate 7 on the bracket 1 .
  • the side wall of the bracket 1 is provided with an accommodating groove 12, the electrode fixing plate 7 is installed in the accommodating groove 12, and the electrode fixing plate 7 is more firmly installed on the bracket 1.
  • the electrode fixing plate 7 may be made of plastic or other lighter materials to reduce the weight of the electromagnetic flowmeter 4000.
  • the electrode fixing plate 7 is provided with a first through hole 71, the electrode fixing plate 7 is sleeved on the tail end of the electrode 3 through the first through hole 71, and the electrode fixing plate is sleeved and matched 7
  • the electrode 3 can be positioned more firmly in the bracket 1 to prevent the electrode 3 from shaking.
  • a sleeve portion (not shown) is provided on the end face of the electrode 3, and the electrode fixing plate 7 is sleeved on the sleeve portion through the first through hole 71.
  • the electrode fixing plate 7 is sandwiched between the electrode 3 and the signal acquisition plate 4 on the corresponding side.
  • the signal acquisition board 4 and the electrode 3 on the corresponding side may be electrically coupled by direct contact.
  • the signal acquisition board 4 is provided with a first electrical connection portion
  • the electrode 3 is provided with a first The electrical mating part, the first electrical connecting part and the first electrical mating part are connected in a plug-in or docking manner to realize the electrical coupling connection between the signal acquisition board 4 and the electrode 3 on the corresponding side.
  • an indirect connection can be used to realize electrical coupling between the signal acquisition board 4 and the electrode 3 on the corresponding side.
  • the end of the electrode 3 is provided with an electrical connection.
  • the connection hole 31 and the signal acquisition board 4 are provided with conductive holes 41.
  • the electromagnetic flowmeter 4000 may further include conductive connectors 400, wherein the conductive connectors 400 include two.
  • the two conductive connectors 400 respectively cooperate with the conductive holes 41 of the signal acquisition board 4 on the corresponding side and the electrical connection holes 31 of the electrodes 3.
  • the conductive connector 400 passes through the conductive holes 41 and is fixedly connected to the electrical connection holes 31.
  • the electrode 3 and the signal acquisition board 4 on the corresponding side are electrically coupled.
  • the signal collection board 4 and the electrode 3 are fixedly connected by the conductive connection member 400 to ensure the stability of the electrical coupling connection between the signal collection board 4 and the electrode 3.
  • the conductive connector 400 is a threaded fastener, such as a conductive screw or a conductive bolt.
  • the electrical connection holes 31 and the conductive holes 41 are respectively provided with electrical contact terminals, and both ends of the conductive connection member 400 are in electrical contact with the electrical contact terminals of the electrical connection holes 31 and the electrical contact terminals in the conductive holes 41, respectively.
  • the signal acquisition board 4 is fixed on the bracket 1 by fasteners, and the fasteners may be screws, bolts, or other quick-release parts.
  • the bracket 1 of this embodiment may further include a third side wall and a fourth side wall disposed oppositely, wherein one coil component 5 is provided on one side of the third side wall, and the other coil component 5 is provided on a side of the fourth side wall side.
  • the arrangement direction of the first side wall and the second side wall is perpendicular to the arrangement direction of the third side wall and the fourth side wall.
  • the arrangement of the electrode 3 and the coil assembly 5 of this embodiment is adopted to make the electromagnetic flowmeter
  • the structure of 4000 is more compact, thereby reducing the volume of electromagnetic flowmeter 4000.
  • the coil assembly 5 may include a spiral coil 51 and a coil fixing plate 52, the spiral coil 51 includes an iron core 511 and a coil 512 wound on the iron core 511, the coil fixing plate 52 and the bracket 1
  • the corresponding side walls of the are fixedly connected, and the corresponding side walls of the coil fixing plate 52 and the bracket 1 surround to form a receiving space, and the iron core 511 and the coil 512 are contained in the receiving space, so that the electromagnetic field is sealed in the bracket 1 by the coil fixing plate 52 .
  • the coil fixing plate 52 is a metal plate such as an iron plate or a steel plate. The metal plate can block the electromagnetic field generated by the coil assembly 5 and seal the electromagnetic field in the bracket 1.
  • the bracket 1 may further include a fifth side wall and a sixth side wall disposed oppositely, one of the open ends of the pipe 2 extends from the fifth side wall, and the other open end of the pipe 2 extends from the sixth side wall Reach out.
  • the arrangement direction of the first side wall and the second side wall, the arrangement direction of the third side wall and the fourth side wall, and the arrangement direction of the fifth side wall and the sixth side wall are respectively perpendicular.
  • the pipeline 2 is a pipeline 2
  • the axis of the spiral coil 51 is arranged substantially perpendicular to the extending direction of the pipeline 2
  • the structure layout of the electromagnetic flowmeter 4000 is more compact.
  • the electromagnetic flowmeter 4000 further includes a housing 8, the housing 8 has a housing space, the bracket 1 is installed in the housing space.
  • the housing 8 includes a housing 81 and a cover plate 82, an opening is provided on one side of the housing 81, the cover plate 82 is used to cover the opening, the holder 1, the electrode 3, the signal acquisition board 4, the coil assembly 5 and the control
  • the plates 6 are all provided in the casing 81.
  • the cover 82 is fixedly connected to the bracket 1.
  • a second positioning portion 821 is provided on the cover plate 82, and a positioning and matching portion 13 is provided on the bracket 1.
  • the second positioning portion 821 is connected to the positioning and matching portion 13, so that the cover plate 82 is fixedly connected to the bracket 1.
  • the second positioning portion 821 and the positioning and matching portion 13 can be mated by plug-in connection or other methods.
  • the materials of the housing 81 and the cover plate 82 can be selected according to needs.
  • the cover plate 82 and/or the housing 81 are aluminum structures, such as aluminum alloy.
  • the outer surface of the cover plate 82 and/or the casing 81 can be coated with laser engraving technology to prevent corrosion of the cover plate 82 and/or the casing 81.
  • the cover plate 82 is in conductive contact with the housing 81.
  • the cover plate 82 is in direct contact with the housing 81 to achieve electrical contact.
  • the signal acquisition board 4 and/or the control board 6 are provided with a ground jack 61.
  • the electromagnetic flowmeter 4000 of this embodiment may further include a ground connection 500, and the ground connection 500 passes through the ground
  • the socket 61 is fixed on the inner side wall of the housing 8, for example, the grounding connector 500 is fixed to the cover plate 82 through the ground socket 61, so that the cover plate 82 and the housing 81 are grounded. This embodiment realizes the grounding of the housing 8 through the cooperation of the ground jack 61 and the ground connector 500.
  • the housing 8 can play the role of electromagnetic shielding.
  • the housing 8 is grounded. Grounding can avoid the signal acquisition board 4, control board 6, etc. from being interfered by external signals.
  • the way in which the housing 8 is grounded to achieve electromagnetic shielding does not increase the volume and weight of the electromagnetic flowmeter, and the electromagnetic flowmeter has a wide range of applications.
  • the ground connection 500 is a threaded fastener, such as a screw or bolt.
  • the ground jack 61 is provided on the signal acquisition board 4, optionally, one of the signal acquisition boards 4 is adjacent to the cover board 82, and the ground jack 61 is located adjacent to the cover board 82 On the signal acquisition board 4 provided, it is convenient for the ground connection 500 to connect the ground jack 61 and the housing 8.
  • the ground jack 61 is provided on the control board 6.
  • the control board 6 is provided adjacent to the cover plate 82 to facilitate the ground connector 500 to connect the ground jack 61 and the housing 8.
  • the side wall of the cover plate 82 facing the opening is provided with a ground protrusion 822.
  • the ground connector 500 passes through the ground jack 61 and is detachably connected to the ground protrusion 822 by The ground connector 500 detachably connects the control board 6 and the ground protrusion 822.
  • the ground connector 500 can be directly removed from the ground protrusion 822, which is convenient and quick .
  • the connection between the housing 81 and the cover 82 is not well sealed, water (mainly moisture in the air) may flow into the housing 81 from the gap between the opening edge of the housing 81 and the cover 82
  • the signal acquisition board 4 and the control board 6 in the housing 81 may be short-circuited when encountering water, and other components in the housing 81 may be damaged due to water, thereby causing damage to the electromagnetic flowmeter 4000.
  • the connection between the housing 81 and the cover plate 82 is provided with a first seal 20, which is used to prevent water (mainly moisture in the air) from the housing 81.
  • the gap between the peripheral edge of the opening and the cover plate 82 flows into the housing 81.
  • the first sealing member 20 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the first sealing member 20.
  • one of the open ends of the pipe 2 protrudes from the side wall of the housing 81 opposite the opening, and the other open end of the pipe 2 protrudes from the cover plate 82. It can be understood that the two open ends of the pipe 2 can also protrude from other positions of the housing 8.
  • the electromagnetic flowmeter 4000 of this embodiment may further include a first pipe connector 100 and a second pipe connector 200, one of the first pipe connector 100 and the pipe 2 The open end is connected, and the second pipe connector 200 is connected to the other open end of the pipe 2.
  • the first pipe connector 100 and the second pipe connector 200 can be connected to an external structure, so as to realize the connection between the electromagnetic flowmeter 4000 and the external structure.
  • the liquid flowing through the pipeline may have different potentials at different positions of the pipeline, and the potential reference referred to when the two electrodes are detected may be inconsistent, resulting in low measurement accuracy.
  • the first pipe connector 100 and the cover plate 82 are fixedly connected, and the first pipe joint 100 and the cover plate 82 are electrically connected to ground.
  • the second pipe connector 200 is fixedly connected to the casing 81, and the second pipe joint 200 and the casing 81 are electrically connected to ground.
  • the grounding of the first pipe connector 100 and the second pipe connector 200 makes the liquid potential in the pipe 2 zero, and both electrodes 3 detect the electromotive force based on the zero potential of the liquid, thereby improving the detection accuracy.
  • first pipe connector 100 and the second pipe connector 200 are only connected to the open end of the pipe 2, it is easy to fall off.
  • the first pipe connector 100 is fixed to the cover 82 to connect the second pipe
  • the head 200 is fixed on the casing 81, which can prevent the first pipe connector 100 and the second pipe connector 200 from falling off and improve the stability of the electromagnetic flowmeter 4000.
  • the fixed connection between the first pipe connector 100 and the cover plate 82 can be designed as required.
  • the cover plate 82 is provided with a first mounting boss 823
  • a mounting boss 823 is provided with a second through hole, the second through hole communicates with one of the open ends of the pipe 2, and the first pipe connector 100 is sleeved on the first mounting boss 823.
  • the first mounting boss 823 is also grounded.
  • the first pipe connector 100 is sleeved on the first mounting boss 823 to realize electrical conduction between the first pipe connector 100 and the first mounting boss 823, thereby achieving grounding of the first pipe connector 100.
  • the first pipe connector 100 is sleeved on the first mounting boss 823, and the first pipe connector 100 can be stably fixed on the cover plate 82.
  • the first mounting boss 823 has a circular ring shape.
  • a third step portion 110 is provided on the inner side wall of the first pipe connector 100, and the third step portion 110 abuts the end surface of the top end of the first mounting boss 823 to ensure that the first pipe connector 100 and the first The mounting boss 823 can be installed in place.
  • a second seal 30 is provided between the third step portion 110 and the end surface of the first mounting boss 823 away from the open end of the pipe 2, the second seal 30 is used to prevent water in the pipe 2 from the first pipe
  • the gap between the connector 100 and the first mounting boss 823 flows into the housing 81, thereby preventing the signal acquisition board 4, the control board 6 and the like in the housing 81 from being short-circuited with water, and avoiding the other in the housing 81 Parts are damaged due to water.
  • the second sealing member 30 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the second sealing member 30.
  • the cover plate 82 is provided with a plurality of first mounting holes 824, and the first pipe connector 100 includes a first mounting portion 120, and the first mounting portion 120 is respectively fixed to the plurality of first mounting holes 824 by threaded fasteners
  • the connection realizes a stable connection between the first pipe connector 100 and the cover 82.
  • the plurality of first mounting holes 824 are spaced apart, so that the first pipe 2 can be fixed to the cover 82 more stably from different directions.
  • the threaded fasteners may be screws or bolts.
  • the fixed connection between the second pipe connector 200 and the housing 81 can also be designed as required.
  • the housing 81 is provided with a second mounting boss 811
  • the second mounting boss 811 is provided with a third through hole
  • the second pipe connector 200 is sleeved on the second mounting boss 811.
  • the second mounting boss 811 is also grounded.
  • the second pipe connector 200 is sleeved on the second mounting boss 811 to realize electrical conduction between the second pipe connector 200 and the second mounting boss 811, thereby achieving grounding of the second pipe connector 200.
  • the second pipe connector 200 is sleeved on the second mounting boss 811, and the second pipe connector 200 can be stably fixed on the housing 81.
  • the second mounting boss 811 has a circular ring shape.
  • a second sealing ring 40 is provided between the inner side wall of the second pipe connector 200 and the outer side wall of the second mounting boss 811, and the second sealing ring 40 is used to prevent water from passing outside the housing 81
  • the gap between the first pipe connector 100 and the second mounting boss 811 flows into the housing 81, thereby preventing the signal acquisition board 4, control board 6 and the like in the housing 81 from being short-circuited with water, and avoiding the housing 81
  • the other parts inside are damaged by water.
  • the outer wall of the second mounting boss 811 is provided with a mounting groove 8111, and the second sealing ring 40 is accommodated in the mounting groove 8111.
  • the second sealing ring 40 may be a rubber sealing ring or a sealing ring made of other materials. The embodiment of the present invention does not specifically limit the material of the second sealing ring 40.
  • the inner wall of the second pipe connector 200 is provided with a fourth stepped portion 210, and the fourth stepped portion 210 is in contact with the end surface of the top end of the second mounting boss 811 to ensure that the second pipe connector 200 and the second The mounting boss 811 can be installed in place.
  • a third seal 50 is provided between the fourth step portion 210 and the top end of the second mounting boss 811 to prevent water in the pipe 2 from passing between the second pipe connector 200 and the second mounting boss 811 The gap between them flows into the housing 81, thereby preventing the signal acquisition board 4, the control board 6 and the like in the housing 81 from being short-circuited with water, and preventing other components in the housing 81 from being damaged by water.
  • the third sealing member 50 may be a rubber sealing member or a sealing member of other materials. The embodiment of the present invention does not specifically limit the material of the third sealing member 50.
  • the housing 81 is provided with a plurality of second mounting holes 812
  • the second pipe connector 200 includes a second mounting portion 220; the second mounting portion 220 is respectively fixed to the plurality of second mounting holes 812 by threaded fasteners
  • the connection realizes a stable connection between the second pipe connector 200 and the housing 81.
  • the plurality of second mounting holes 812 are spaced apart, so that the second pipe connector 200 can be more stably fixed to the housing 81 from different directions.
  • the threaded fasteners may be screws or bolts.
  • first pipe connector 100 and the second pipe connector 200 in this embodiment may be made of stainless steel, which is not easy to be oxidized, thereby preventing the first pipe connector 100 and the second pipe connector 200 from oxidizing and conducting electricity. If the first pipe connector 100 and the second pipe connector 200 are electrically conductive, the detection reference of the two electrodes 3 is not 0 potential, and with time, the detection reference of the two electrodes 3 may also change, resulting in electromagnetic The detection accuracy of the flow meter 4000 decreases.
  • the first pipe connector 100 and the second pipe connector 200 can also be made of other materials that are not easily oxidized.
  • the parts where the first pipe connector 100 and the second pipe connector 200 are in contact with the cover plate 82 and the housing 81 are passivated to prevent the oxidation of the first pipe connector 100 and the second pipe connector 200 Conductive.
  • the electromagnetic flowmeter 4000 of this embodiment further includes an electric plug 300, which is used to connect an external power source, so that the electromagnetic flowmeter 4000 is powered on.
  • the control board 6 is provided with a second electrical connection portion 62
  • the cover plate 82 is provided with a plug interface 825
  • the second electrical connection portion 62 is accommodated in the plug interface 825
  • the electric plug 300 is connected to The second electrical connection portion 62 is mated in the socket 825.
  • the two electrodes 3 Since the two electrodes 3 must be located on both sides of the electromagnetic field, and the signals of the two electrodes 3 need to be amplified and/or noise-reduced corresponding to the signal acquisition board 4 on the side, the signals collected by the two signal acquisition boards 4 need to be finally aggregated to the control Only board 6 can be processed. Since the two signal acquisition boards 4 are also relatively arranged on both sides of the bracket 1, one of the signal acquisition boards 4 needs to be connected to the control board 6 through the signal line 9, due to structural limitations, the signal line 9 will pass through the electromagnetic field, which is It will cause a closed conductor loop in the electromagnetic field.
  • the electromagnetic field in the electromagnetic flowmeter is an alternating magnetic field
  • the plane formed by the conductor loop is not parallel to the direction of the magnetic field, it will be affected by the changing magnetic field to generate an induced electromotive force and interfere with the measurement signal.
  • This interference is called Differential interference.
  • the existence of differential interference will affect the stability of the flow rate signal and reduce the measurement accuracy. For a long time, the industry lacked effective solutions. Relying on manual adjustments and software evasion methods cannot solve this problem very well.
  • the embodiments of the present invention reduce the projected area of the conductor loop formed by the signal line in the direction of the electromagnetic field by adjusting the direction of the signal line, and suppress the differential interference within a reasonable range to reduce the degree of interference and effectively control the individual The difference between them ensures that the assembled flow meter has a small difference.
  • the electromagnetic flowmeter 4000 may further include a signal line 9. Both ends of the signal line 9 are electrically connected to two signal acquisition boards 4 (one of which is also a control board 6 ). Coupling connection, the two helical coils 51 of this embodiment are arranged coaxially, the arrangement direction of the signal line 9 intersects the axes of the two helical coils 51, and the signal line 9 is arranged around the end of one of the coil assemblies 5 .
  • the signal line 9 and the two signal acquisition boards 4 form a “gate”-like structure.
  • the arrangement direction of the signal wires 9 refers to the extending direction of the two connecting ends of the signal wires 9 used to connect the two signal acquisition boards 4.
  • the structural limit between the signal line 9 and the two signal acquisition boards 4 is rationally designed to minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, which can eliminate differential interference on the signal.
  • the effect of the electromagnetic flowmeter 4000 improves the measurement accuracy of the electromagnetic flowmeter 4000, and effectively controls the differences between the individuals, ensuring that the difference in the assembled flowmeter is small, so that the electromagnetic flowmeter 4000 has better signal consistency.
  • the pipeline 2 is a straight pipeline 2, and the signal line 9 is arranged substantially perpendicular to the extending direction of the pipeline 2. Since the axis of the spiral coil 51 is perpendicular to the extending direction of the pipe 2, the central axis of the signal line 9 and the axis of the spiral coil 51 are also perpendicular to each other, and the projection of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field is a point, so This structural design method can minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, thereby maximally eliminating the effect of differential interference on the signal and improving the measurement accuracy of the electromagnetic flowmeter 4000.
  • the extending direction of the signal line 9 and the pipeline 2 is substantially perpendicular means that the angle between the signal line 9 and the extending direction of the pipeline 2 is 90° ⁇ an error value, that is, within the allowable error range, the signal line 9 can be considered It is substantially perpendicular to the extending direction of the pipe 2.
  • the two electrodes 3 are arranged coaxially, and the central axis of the signal line 9 is arranged coplanar with the central axis of the electrode 3. Since the axis of the spiral coil 51 is perpendicular to the central axis of the electrode 3, the central axis of the signal line 9 and the axis of the spiral coil 51 are also perpendicular to each other, and the projection of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field is a point, so This structural design method can minimize the projection area of the conductor loop formed by the signal line 9 in the direction of the electromagnetic field, thereby maximally eliminating the effect of differential interference on the signal and improving the measurement accuracy of the electromagnetic flowmeter 4000.
  • the signal line 9 has a preset width and a preset length, and the width direction of the signal line 9 is parallel to the extending direction of the pipe 2.
  • This layout method can also make the central axis of the signal line 9 and the axis of the spiral coil 51 perpendicular to each other , And to the greatest extent eliminate the effect of differential interference on the signal, improve the measurement accuracy of the electromagnetic flowmeter 4000.
  • the width of the signal line 9 refers to the width of the signal line 9 perpendicular to the arrangement direction of the signal line 9.
  • the preset width can be determined according to the number of signal paths between the two signal acquisition boards 4.
  • the shape of the signal line 9 can be designed according to needs, in order to increase the compactness of the structure to reduce the volume of the electromagnetic flowmeter 4000, optionally, the signal line 9 is a sheet structure, and the signal line 9 is substantially parallel to the support 1 The sidewall is set.
  • the bracket 1 is square, and the signal wires 9 are arranged along the symmetry axis of the side wall of the bracket 1 to ensure that the arrangement direction of the signal wires 9 intersects the axes of the two helical coils 51 as much as possible. It is possible to eliminate the effect of differential interference on the signal.
  • the signal line 9 of this embodiment may be provided on one side of the third side wall or the fourth side wall, as far as possible to ensure that the arrangement direction of the signal line 9 intersects the axes of the two spiral coils 51.
  • the middle of the signal line 9 is substantially parallel to the surface of the third side wall or the fourth side wall to ensure that the axis of the signal line 9 and the spiral coil 51 are perpendicular to eliminate the effect of differential interference on the signal as much as possible and improve the electromagnetic The measurement accuracy of the flowmeter 4000.
  • the middle of the signal line 9 is substantially parallel to the surface of the third side wall or the fourth side wall means that the middle of the signal line 9 is completely parallel to the surface of the third side wall or the fourth side wall, or the The middle portion is approximately parallel to the surface of the third side wall or the fourth side wall.
  • the spacer is provided between the coil fixing plate 52 and the signal line 9, and the spacer is used to make a gap between the signal line 9 and the coil fixing plate 52 to ensure the signal line 9 and the third side wall or the fourth side wall
  • the spacing between the inner coil assemblies 5 is stable.
  • the spacer can be made of hard material or flexible material.
  • the spacer is made of a material that can be deformed to prevent the signal line 9 from being worn and extend the service life of the signal line 9.
  • the spacer can be foam or rubber, or other flexible parts.
  • the implementation method of connecting the signal line 9 to the two signal acquisition boards 4 can be selected according to needs.
  • the two ends of the signal line 9 are detachably connected to the corresponding signal acquisition boards 4 through electrical connectors, respectively.
  • the two signal acquisition boards 4 are electrically coupled.
  • one end of the signal line 9 is integrally formed with one of the signal acquisition boards 4, and the other end of the signal line 9 is provided with an electrical connector, which is detachable from the electrical connector of the other signal acquisition board 4 Connection, the signal line 9 is not easy to lose, and this design will not cause trouble to the installation of the signal acquisition board 4 and reduce the weight of the electromagnetic flowmeter 4000.
  • the electrical connector of the signal line 9 and the electrical connector of the signal acquisition board 4 are a male head and a female head that cooperate with each other, and the cooperation of the male head and the female head can realize the electrical connection between the signal line 9 and the signal acquisition board 4. Coupling connection.
  • the two ends of the signal line 9 are respectively connected to the center positions of the sides of the two signal acquisition boards 4 so as to ensure that the axes of the two spiral coils 51 pass through the signal line 9.
  • the signal line 9 in this embodiment may be an FPC line, and the FPC line is convenient to be bent, so that the signal acquisition boards 4 relatively disposed on both sides of the bracket 1 can be more conveniently connected. It can be understood that the signal line 9 may also be other types of wires.
  • the two signal acquisition boards 4 are connected by a signal transmission circuit board to realize signal transmission.
  • the two signal acquisition boards 4 and the signal transmission board form a similar "gate" shape structure, thereby eliminating differential interference pairs The influence of the signal improves the measurement accuracy of the electromagnetic flowmeter 4000.
  • the electromagnetic flowmeter 4000 of the above embodiment can be applied to plant protection drones or other devices with liquid channels.
  • an embodiment of the present invention further provides a plant protection drone, which may include a rack 1000, a spray assembly 2000 installed on the rack 1000, a medicine box 3000 installed on the rack 1000, and The electromagnetic flowmeter 4000 of the spraying flow in the above embodiment, wherein the electromagnetic flowmeter 4000 is used to detect the spraying assembly 2000 in real time, the structure and working principle of the electromagnetic flowmeter 4000 can be referred to the description of the above embodiment, and will not be repeated here.
  • one of the open ends of the pipe 2 of the electromagnetic flowmeter 4000 communicates with the spraying assembly 2000 through a diversion tube, and the other open end of the pipe 2 communicates with the medicine box 3000 through a diversion tube.
  • one of the open ends of the pipe 2 is connected to the sprinkler assembly 2000 through the first pipe connector 100 to connect with the guide tube, and the other open end of the pipe 2 is connected to the guide pipe through the second pipe connector 200 to connect with the medicine box 3000 connectivity.
  • the electromagnetic flowmeter 4000 of this embodiment is small in size and light in weight.
  • the application of the electromagnetic flowmeter 4000 to a plant protection drone will not affect the installation of other structures of the plant protection drone, and will not bring about a greater impact on the plant protection drone.
  • the heavy load has improved the endurance of plant protection drones.
  • the rack 1000 may include a body 1100 and a tripod 1200 connected to both sides of the bottom of the body 1100. Further, the rack 1000 may further include arms 1300 connected to both sides of the fuselage 1100.
  • the spray assembly 2000 of this embodiment includes at least a spray head.
  • the spray assembly 2000 is installed at an end of the arm 1300 away from the fuselage 1100.
  • the plant protection drone is a multi-rotor drone, including a propeller.
  • the propeller is disposed at an end of the arm 1300 away from the fuselage 1100, and the spray assembly 2000 is located below the propeller.
  • the medicine box 3000 is installed at the bottom of the fuselage 1100, and is located between the two tripods 1200.
  • the electromagnetic flowmeter 4000 is provided at the water outlet of the medicine box 3000.
  • the control board 6 after obtaining the spray flow of the spray assembly 2000, the control board 6 sends the spray flow to the flight controller of the plant protection drone, and the flight controller according to the spray flow sent by the control board 6 and the actual demanded spray The flow rate controls the water output of the medicine box 3000.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Measuring Volume Flow (AREA)

Abstract

L'invention concerne un débitmètre électromagnétique (4000) et un véhicule aérien sans pilote de protection de plante comportant le débitmètre électromagnétique (4000). Le débitmètre électromagnétique (4000) comprend : un cadre de support (1) ; une conduite (2) disposée au niveau du cadre de support (1), deux extrémités ouvertes de la conduite (2) étant exposées par le cadre de support (1) ; deux électrodes (3) disposées à l'opposé l'une de l'autre sur deux côtés du cadre de support (1), les extrémités de détection des deux électrodes (3) traversant les parois latérales du cadre de support (1) et de la conduite (2), respectivement, et pouvant entrer en contact avec le liquide s'écoulant dans la conduite (2), et les extrémités de détection des deux électrodes (3) étant disposées à l'opposé l'une de l'autre ; deux panneaux d'acquisition de signal (4), les deux panneaux d'acquisition de signal (4) et les deux électrodes (3) étant disposées de manière correspondante sur le même côté du cadre de support (1), et les panneaux d'acquisition de signal (4) étant utilisés pour acquérir des signaux provenant des électrodes (3) sur le côté correspondant à ceux-ci ; deux composants de bobine (5) disposés à l'opposé l'un de l'autre sur un autre côté du cadre de support (1) ; et une carte de commande (6) couplée électriquement et respectivement connectée aux deux panneaux d'acquisition de signaux (4), et utilisée pour obtenir, en fonction des signaux recueillis par les deux panneaux d'acquisition de signaux (4), un débit et/ou une vitesse du liquide s'écoulant dans la conduite (2), la carte de commande (6) et l'un des panneaux d'acquisition de signal (4) étant intégrés l'un à l'autre et disposés sur la même carte de circuit imprimé. Le débitmètre électromagnétique (4000) présente une conception compacte et une taille réduite, est léger, et peut être appliqué à des véhicules aériens sans pilote de protection de plante pour effectuer des opérations de pulvérisation.
PCT/CN2018/118184 2018-11-29 2018-11-29 Débitmètre électromagnétique et véhicule aérien sans pilote de protection de plante le comportant WO2020107324A1 (fr)

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CN201880041248.9A CN110785637B (zh) 2018-11-29 2018-11-29 电磁流量计和具有该电磁流量计的植保无人机
PCT/CN2018/118184 WO2020107324A1 (fr) 2018-11-29 2018-11-29 Débitmètre électromagnétique et véhicule aérien sans pilote de protection de plante le comportant

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CN116734934B (zh) * 2023-08-11 2023-11-14 德阳市新泰自动化仪表有限公司 一种紧凑型电磁流量计、安装方法及测流量方法

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