CN210893263U

CN210893263U - Electromagnetic flowmeter, sprinkler and movable platform

Info

Publication number: CN210893263U
Application number: CN201921559897.6U
Authority: CN
Inventors: 舒展; 周乐; 常子敬
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-09-17
Filing date: 2019-09-17
Publication date: 2020-06-30
Anticipated expiration: 2029-09-17

Abstract

The utility model provides an electromagnetic flowmeter, sprinkler and movable platform, electromagnetic flowmeter includes: a housing; a set of conduits disposed in the housing, including at least two spaced apart conduits; a pair of excitation coils for applying a magnetic field to the fluid flowing through the at least two pipes, which are respectively arranged at both sides of the pipe group; a grounding member for grounding and electrically communicating with a fluid flowing through the pipe; at least two pairs of electrodes for detecting an electric potential induced by the fluid flowing in the pipe in the magnetic field, each pair of electrodes comprising two electrodes oppositely disposed on the side wall of each pipe, the detection end of each electrode passing through the side wall of the pipe and being capable of contacting the fluid flowing through the pipe. The utility model discloses integrateed two or more than two pipelines, detect fluidic flow in every pipeline respectively, need not to carry out the flow calibration to every pump to compact structure, light in weight.

Description

Electromagnetic flowmeter, sprinkler and movable platform

Technical Field

The utility model relates to a flow measurement technical field especially relates to electromagnetic flowmeter, sprinkler and movable platform.

Background

Along with plant protection unmanned aerial vehicle's popularization gradually, requirement to spraying the precision is higher and higher. The spraying flow is low, so that the spraying is leaked or the protection is not in place, and the high flow causes adverse effects such as seedling burning. In addition, the sprayed amount is an important parameter during plant protection operation, the precision of the existing liquid level meter is limited, and the statistical operation area of the flyer is influenced. In order to improve the control accuracy of spraying and the calculation accuracy of the sprayed amount, an electromagnetic flow meter is used. However, the current electromagnetic flow meter can only detect the total flow of multiple pumps, and cannot detect the flow of each pump individually.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

To the deficiency of the prior art, the embodiment of the utility model provides a first aspect provides an electromagnetic flowmeter, electromagnetic flowmeter includes:

a housing;

a tube bank disposed in the housing, the tube bank including at least two tubes disposed at intervals;

a pair of excitation coils for applying a magnetic field to the fluid flowing through the at least two pipes, the pair of excitation coils being respectively arranged at both sides of the pipe group;

a grounding member for grounding and electrically communicating with a fluid flowing through the pipe;

at least two pairs of electrodes for detecting an electric potential induced by the fluid flowing in the pipe in the magnetic field, each pair of electrodes comprising two electrodes oppositely disposed on the side wall of each pipe, the detection end of each electrode passing through the side wall of the pipe and being capable of contacting the fluid flowing through the pipe.

According to the utility model discloses a second aspect of the embodiment provides a sprinkler, sprinkler includes:

a medicine chest;

at least two water pumps for pumping fluid from the tank;

at least two spray heads for spraying the fluid; and

the embodiment of the utility model provides an electromagnetic flowmeter, electromagnetic flowmeter is used for real-time detection every the flow of water pump, electromagnetic flowmeter's every wherein one end intercommunication of pipeline one among at least two water pumps, the other end intercommunication one among at least two shower nozzles.

According to the utility model discloses a third aspect of the embodiment provides a movable platform, includes:

a movable platform body; and

carry on at least one on the movable platform body the embodiment of the utility model provides a sprinkler.

The utility model discloses electromagnetic flowmeter, sprinkler and movable platform are integrated in same electromagnetic flowmeter with two or more than two pipelines to can detect fluidic flow in every pipeline respectively, and the overall arrangement mode of pipeline, electrode and excitation coil among the electromagnetic flowmeter makes same can apply magnetic field to the fluid in many pipelines simultaneously to excitation coil, has increased compact structure nature, has reduced electromagnetic flowmeter's volume, and has alleviateed electromagnetic flowmeter's weight.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a cross-sectional view of an electromagnetic flow meter of an embodiment of the present invention in a first direction;

fig. 2 is a cross-sectional view of an electromagnetic flow meter of an embodiment of the present invention in a second orientation;

fig. 3 is a cross-sectional view of an electromagnetic flow meter of an embodiment of the present invention in a third orientation;

fig. 4 is a perspective view of the exterior of an electromagnetic flow meter housing in accordance with an embodiment of the present invention;

fig. 5 is a perspective view of the inside of the housing of the electromagnetic flow meter according to the embodiment of the present invention;

fig. 6 is a schematic view of a spraying device according to an embodiment of the present invention;

fig. 7 is a schematic diagram of a movable platform according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the present invention and are not intended to limit the invention to the particular embodiments described herein. Based on the embodiments of the present invention described in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

The electromagnetic flowmeter, the spraying device and the movable platform of the present invention will be described in detail with reference to the accompanying drawings. The features of the following examples and embodiments may be combined with each other without conflict.

As shown in fig. 1 to 5, an aspect of the present invention provides an electromagnetic flowmeter, which includes a housing 101, a pipe set disposed in the housing 101, the pipe set including at least two pipes 102 disposed at an interval; a pair of excitation coils 103 for applying a magnetic field to the fluid flowing through the at least two pipes 102, the pair of excitation coils 103 being respectively arranged at both sides of the pipe group; a grounding member for grounding and electrically communicating with a fluid flowing through the pipe 102; and at least two pairs of electrodes for detecting an electric potential induced by the fluid flowing in the pipe 102 in the magnetic field, each pair of electrodes respectively comprising two electrodes 104 oppositely disposed on the side wall of each pipe 102, the detection end of each electrode 104 passing through the side wall of the pipe 102 and being capable of contacting the fluid flowing through the pipe.

Alternatively, as shown in fig. 3, the casing 101 includes a housing 1011 having a receiving space therein for receiving the pipe 102, the exciting coil 103, the electrode 104, the electrode plate 105, etc., and having an opening at one side thereof, and a cover 1012 for covering the opening.

In this embodiment, the housing 1011 and the cover 1012 are formed of a conductive material, which includes a metal. The cover plate 1012 is in electrically conductive contact with the housing 1011, and optionally the cover plate 1012 is in direct contact with the housing 1011 for electrical contact. Optionally, the cover plate 1012 and/or the housing 1011 are aluminum structures, such as aluminum alloys. Further, the outer surface of the cover plate 1012 and/or the housing 1011 may be coated using laser etching techniques to prevent corrosion of the cover plate 1012 and/or the housing 1011.

Alternatively, with continued reference to FIG. 3, one of the open ends of the conduit 102 extends from the opposite open side wall of the housing 1011 and the other open end of the conduit 102 extends from the cover plate 1012. However, it is understood that the two open ends of the conduit 102 may also extend from other locations of the housing 101.

The pipe 102 in this embodiment is used for flowing a fluid, which is a fluid whose flow rate needs to be detected, for example, when the electromagnetic flowmeter 100 is applied to a plant protection unmanned aerial vehicle, the fluid may be water or liquid pesticide. Alternatively, the duct 102 of the present embodiment is a straight duct, and two open ends of the duct 102 are respectively exposed from two opposite sidewalls of the casing 101.

The embodiment of the present invention integrates at least two pipelines 102 in the same electromagnetic flowmeter 100, and detects the flow of each pipeline 102 respectively. The number of the pipes 102 is two or more, and may be specifically set according to actual needs, for example, four pipes 102 are shown in fig. 1, fig. 2, fig. 4, and fig. 5.

The at least two pipes 102 may be arranged in various ways, as long as the two pipes 102 are located in the electromagnetic field generated by the two excitation coils 103, so that the fluid in the pipes 102 can be subjected to the electromagnetic field to generate electromotive force.

In one embodiment, at least two conduits 102 may be arranged in parallel spaced apart relationship, as shown in FIG. 1; in another embodiment, the at least two pipes 102 may also be distributed in a fan shape; alternatively, the at least two conduits 102 may be arranged in a straight line. At least two of the conduits 102 may be equally spaced, as shown in fig. 1; or the spacing between at least two of the conduits 102 may be varied in a gradual manner, for example, the spacing between the plurality of conduits 102 may be gradually increased or decreased.

Two excitation coils 103 are respectively disposed on opposite sides of the pipe group of the plurality of pipes 102, and in one embodiment, the two excitation coils 103 are coaxially disposed. The two excitation coils 103 are used to generate electromagnetic fields that act simultaneously on the plurality of pipes 102 in the pipe set. In one embodiment, when the at least two pipes are arranged in parallel, the direction of the magnetic field formed by the two excitation coils 103 is substantially perpendicular to the extending direction of the at least two pipes 102. In one embodiment, the electromagnetic field is an alternating magnetic field, and the electromagnetic field generated by the two excitation coils 103 is capable of acting on the fluid within the pipe 102 through the pipe 102. When the flow rate of the fluid flowing through each pipe 102 changes, the difference between the induced electromotive forces of the two electrodes 104 changes under the action of the electromagnetic field.

In conjunction with fig. 1, the exciting coil 103 may include a core 1031 and a coil 1032 wound on the core 1031. Further, the excitation coil 103 further includes a coil holder 1033. In one embodiment, the iron core 1031 and the coil 1032 are provided with a vibration absorbing pad 1034 for preventing magnetic field fluctuation caused by vibration of the coil 1032. Further, a silicon steel sheet 1035 is further disposed on the shock-absorbing pressing sheet 1034 for constraining the magnetic field direction and reducing magnetic flux leakage.

The electromotive force induced by the fluid in each pipe 102 is detected by a pair of electrodes 104 provided on the pipes 102, respectively. The sensing ends of two electrodes 104 of a pair are oppositely disposed, and the sensing end of each electrode 104 passes through the sidewall of the pipe 102 and is capable of contacting a fluid flowing through the pipe 102. In one embodiment, the set of pipes includes four pipes 102, and each pipe 102 has a pair of electrodes, so that the electromagnetic flowmeter 100 includes four pairs of eight electrodes.

In one embodiment, in order to accurately detect the electromotive force of the fluid, each pair of the electrodes 104 is coaxially disposed, that is, the detection ends of the two electrodes 104 in each pair are opposite to each other, and the axes of the two electrodes 104 are located on the same straight line. The extending direction of the electrodes 104 is substantially perpendicular to the direction of the electromagnetic field generated by the excitation coil 103. And the direction of extension of the electrode 104 is substantially perpendicular to the direction of extension of the pipe 102. In one embodiment, the axes of the at least two pairs of electrodes 104 are located on the same plane, e.g., each pair of electrodes 104 is disposed at a central location of the pipe 102; meanwhile, the axis of the exciting coil 103 and the axis of the electrode 104 are located on the same plane. That is, in the present embodiment, the axial direction of the electrode 104, the axial direction of the excitation coil 103, and the axial direction of the pipe 102 are orthogonally distributed.

The utility model discloses with two or more than two pipeline 102 integration in same electromagnetic flowmeter 100 to can detect every pipeline 102's flow respectively, and pipeline 102, electrode 104 and excitation coil 103's layout mode among the electromagnetic flowmeter 100 makes same can be simultaneously to excitation coil 103 to the fluid in many pipelines 102 applys magnetic field, has increased compact structure nature, has reduced electromagnetic flowmeter 100's volume, and has alleviateed electromagnetic flowmeter 100's weight.

Further, the electromagnetic flowmeter 100 further includes two electrode plates 105, and the two electrode plates 105 are respectively located above the electrodes 104 on one side and are used for acquiring signals of at least two electrodes 104 on the corresponding side. In this embodiment, the electrode plate 105 on each side collects signals of at least two electrodes 104 on the corresponding side, so that signal interference can be reduced.

In one embodiment, the electrode 104 is compressed by a compression screw 106 over the electrode plate 105 and secured by an electrode tab 107 over the tube 102 to prevent the electrode 104 from falling off the tube 102 or the electrode plate 105.

In some embodiments, the electromagnetic flowmeter 100 further comprises a main board 108, wherein the main board 108 is electrically coupled to the two electrode plates 105, respectively, and the main board 108 is capable of calculating the flow rate of the fluid flowing through each of the pipes 102 according to the signals collected by each pair of electrode plates 105. The flow rate Q of the fluid flowing through each pipe 102 is calculated as follows:

wherein B is the magnetic field strength; u is the induced electromotive force measured by the two electrodes 104; a is the cross-sectional area of the conduit 102; d is the diameter of the pipe 102; k is a correction coefficient for reducing an error between the flow rate Q of the liquid flowing through the pipe 102 obtained by the calculation of the formula and the flow rate of the liquid actually flowing through the pipe 102.

Illustratively, after calculating the flow rate Q of the liquid flowing through the pipe 102, the velocity of the liquid flowing through the pipe 102 can also be calculated according to the flow rate Q of the liquid flowing through the pipe 102.

Optionally, the main board 108 is integrated with one of the electrode plates 105 on the same circuit board, thereby further increasing the compactness of the structure, reducing the volume of the electromagnetic flow meter 100, and reducing the weight of the electromagnetic flow meter 100. In other embodiments, it is also possible to integrate the function of the main board 108 on one of the electrode plates 105 and to electrically couple the two electrode plates 105.

In one embodiment, pins 116 are provided on motherboard 108 for a quick-connect connection of electromagnetic flowmeter 100 to a line plug.

Since the signals collected by the two electrode plates 105 need to be collected to the main board 108 for processing, one of the electrode plates 105 needs to be connected to the main board 108 through a signal line. When a signal line crosses an electromagnetic field, a closed conductor loop is caused to exist in the electromagnetic field. And because the electromagnetic field in the electromagnetic flowmeter is an alternating magnetic field, if the plane of a signal loop is not parallel to the direction of the magnetic field, induced electromotive force is generated under the influence of the changed magnetic field to interfere with a measurement signal, so that the stability of a flow velocity signal is influenced, and the measurement accuracy is reduced.

In order to solve the above problem, the embodiment of the present invention connects two electrode plates 105 through a Flexible Printed Circuit (FPC) 109. The flexible circuit board 109 is conveniently bent so that the electrode plates 105 at both sides can be more conveniently connected. The direction of the flexible circuit board 109 is parallel to the direction of the magnetic field, so that the projection area of the conductor loop in the direction of the electromagnetic field is reduced as much as possible, differential interference is suppressed in a reasonable range to reduce the interference degree, the difference among individuals is effectively controlled, and the difference of the assembled flowmeter is ensured to be small.

Specifically, referring to fig. 2, both ends of the flexible circuit board 109 are electrically coupled to the two electrode plates 105, respectively, and the flexible circuit board 109 is disposed around the outside of the end of one of the excitation coils 103. The two excitation coils 103 of the present embodiment are coaxially arranged, the plurality of pipes 102 are arranged in parallel, and the routing direction of the flexible circuit board 109 intersects with the axes of the two excitation coils 103, is substantially perpendicular to the extending direction of the pipes 102, and is perpendicular to the axes of the excitation coils 103. The structural design mode can enable the signal loop plane to be parallel to the magnetic field direction, thereby eliminating the influence of differential interference on signals to the maximum extent and improving the measurement accuracy of the electromagnetic flowmeter 100.

Further, a shock absorbing material 110 is provided between the flexible circuit board 109 and the exciting coil 103 for stabilizing a space between the flexible circuit board 109 and the exciting coil 103. The shock absorbing material 110 may be made of a flexible material to prevent the flexible circuit board 109 from being worn. The flexible material can be a foam piece or a rubber piece, and can also be other flexible materials.

The implementation manner of the flexible circuit board 109 connected to the two electrode plates 105 can be selected as required, for example, in some embodiments, the two ends of the flexible circuit board 109 are detachably connected to the corresponding electrode plates 105 through the electrical connectors to implement the electrical coupling connection of the two electrode plates 105. Further alternatively, both ends of the flexible circuit board 109 are connected to the center positions of the side edges of the two electrode plates 105, respectively.

With reference to fig. 1, 3, 4 and 5, the electromagnetic flowmeter 100 of the present embodiment may further include a first pipe connector 111 and a second pipe connector 112, where the first pipe connector 111 is connected to one of the open ends of the pipe 102, and the second pipe connector 112 is connected to the other open end of the pipe 102. The first pipe joint 111 and the second pipe joint 112 may be connected to an external structure, so as to connect the electromagnetic flowmeter 100 to the external structure. In one embodiment, the first and second pipe joints 111, 112 are both made of a metallic material.

In order to prevent the first pipe joint 111 and the second pipe joint 112 from falling off, in this embodiment, the first pipe joint 111 is fixed to the cover plate 1012, and the second pipe joint 112 is fixed to the housing 1011, so as to improve the stability of the electromagnetic flowmeter 100. The fixed connection between the first pipe connector 111 and the cover plate 1012 and between the second pipe connector and the housing 1011 can be designed according to the requirement, for example, in an embodiment, referring to fig. 3, the connection can be made by using a fastening nut 113.

Optionally, referring to fig. 1, the joints between first and

second conduit connectors

111 and 112 and conduit 102 are provided with a sealing member 114, and the sealing member 114 is used to prevent the liquid in conduit 102 from flowing into housing 101 from the gap at the joint, thereby avoiding short circuit of electrode plate 105, main board 108, etc. in housing 1011 and avoiding damage of other components in housing 101 in the event of water. The sealing element 114 may be a rubber sealing element or a sealing element made of other materials.

In order to avoid the difference in potential reference between the two electrodes during detection caused by the difference in potential of the fluid flowing through the pipe 102 at different positions of the pipe 102, both the first pipe connector 111 and the second pipe connector 112 need to be grounded (connected to water). In this embodiment, the fluid in the pipe 102, the first pipe joint 111, the housing 101 (including the cover plate 1012 and the housing 1011), and the second pipe joint 112 are electrically conducted to form a grounding path, and the first pipe joint 111, the housing 101, and the second pipe joint 112 form the grounding member, as shown in fig. 3. Grounding of the first and second pipe joints 111 and 112 enables the electrode 104 to detect an electromotive force with reference to the 0 potential of the liquid, thereby improving the accuracy of the detection. Meanwhile, the grounding of the casing 101 is realized, so that the casing 101 can play a role of electromagnetic shielding, and therefore, under the condition that no additional electromagnetic shielding cover is added, the electrode plate 105, the main board 108 and the like are prevented from being interfered by external signals through the grounding of the casing 101, and meanwhile, the volume and the weight of the electromagnetic flowmeter cannot be increased.

In one embodiment, in order to prevent the liquid in the pipe 102 from leaking through the electrode mounting hole and causing short circuit of the electrode plate 105, in some embodiments, a sealing ring 115, which may be a rubber sealing ring or a sealing ring made of other materials, may also be disposed at the electrode mounting hole of the pipe 102.

To sum up, the utility model discloses electromagnetic flowmeter is with two or the pipeline integration more than two in same electromagnetic flowmeter to can detect fluidic flow in every pipeline respectively, and the overall arrangement mode of pipeline, electrode and excitation coil in the electromagnetic flowmeter makes same can exert magnetic field to the fluid in many pipelines simultaneously to excitation coil, has increased compact structure nature, has reduced electromagnetic flowmeter's volume, and has alleviateed electromagnetic flowmeter's weight.

According to a second aspect of an embodiment of the present invention, there is provided a spraying device, see fig. 6, fig. 6 showing a schematic view of a spraying device according to an embodiment of the present invention, the spraying device 600 comprising a medicine box 610; at least two water pumps 620 for pumping the fluid in the drug tank; at least two spray heads 640 for spraying the fluid; and the utility model discloses first aspect electromagnetic flowmeter 630, electromagnetic flowmeter 630 is used for real-time detection every water pump 620's flow, every of electromagnetic flowmeter 630 wherein one end intercommunication of pipeline one of at least two water pumps 620, the other end intercommunication one of at least two shower nozzles 640.

The specific structure of the electromagnetic flowmeter 630 may adopt the structure of the electromagnetic flowmeter in each of the above embodiments, and is not described herein again.

Optionally, the spraying device further comprises: and the controller automatically controls the water pump to spray according to a preset spraying task according to the preset spraying task. The preset spraying tasks may be stored in a memory. The preset spraying task can be set according to the requirement.

Optionally, the spraying device further comprises: and the wireless communication device is electrically connected with the controller and is used for receiving a spray head control instruction of a user and sending the spray head control instruction to the controller so as to control the switching device. The wireless communication device can be arranged independently or in the controller.

In one embodiment, the wireless communication device may also receive the preset spraying tasks and store the spraying tasks in the memory. For example, the preset spraying task may be received before the spraying job is performed, or may be received during the spraying job.

Optionally, the spraying device further comprises: and the ground control end is used for being in communication connection with the wireless communication device, and a user can send the spray head control instruction through the ground control end. Optionally, the ground control terminal includes at least one of: remote controller, cell-phone, panel computer, ground base station.

Optionally, the wireless communication device can be in communication connection with the ground control terminal. Specifically, the communication mode of the wireless communication device and the ground control terminal may be a line-of-sight communication mode or a non-line-of-sight communication mode. The line-of-sight communication mode can be WIFI, Bluetooth and the like. The non-line-of-sight communication method can be a communication network such as 2G, 3G, 4G, 5G and the like.

According to a third aspect of the embodiments of the present invention, a movable platform is provided, fig. 7 shows a schematic diagram of a movable platform 700 according to an embodiment of the present invention, referring to fig. 7, the movable platform 700 includes: a movable platform body 710 and a spraying device 720.

A spraying device 720 is carried on the movable platform body 710; the specific structure of the spraying device 710 can be referred to the spraying devices of the above embodiments.

Optionally, the movable platform comprises an unmanned aerial vehicle, or a ground vehicle. The ground vehicle can be a ground robot, an agricultural machine, and the like.

In one embodiment, the movable platform is an unmanned aerial vehicle, and the movable platform body includes a central body and a plurality of horn arms, and the horn arms are fixedly or rotatably connected with the central body.

Further, the movable platform body further comprises a landing gear. The medication box may be attached to the central body or to the landing gear. The electromagnetic flow meter may be attached to a horn or a central body.

According to the utility model discloses a sprinkler can be used for automatic spraying. In one embodiment, the utility model discloses sprinkler is applied to movable platform, and movable platform that has sprinkler can spray to external environment, for example, be used for plant irrigation or liquid medicine such as agricultural, forestry to spray. In certain embodiments, the movable platform comprises at least one of an unmanned aerial vehicle or a ground vehicle. When the spraying device is applied to the unmanned aerial vehicle, the platform body is a fuselage of the unmanned aerial vehicle. This unmanned vehicles can be plant protection unmanned aerial vehicle. When the spraying device is applied to ground vehicles such as automobiles, the platform body is the automobile body of the automobile. The vehicle may be an autonomous vehicle or a semi-autonomous vehicle.

The utility model discloses electromagnetic flowmeter, sprinkler and movable platform are integrated in same electromagnetic flowmeter with two or more than two pipelines to can detect fluidic flow in every pipeline respectively, need not to carry out flow calibration to every pump, the overall arrangement mode of pipeline, electrode and excitation coil among the electromagnetic flowmeter makes same can be simultaneously to the excitation coil fluid application magnetic field in many pipelines, has increased compact structure nature, has reduced electromagnetic flowmeter's volume, and has alleviateed electromagnetic flowmeter's weight.

It will be understood by those skilled in the art that all of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where such features are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.

Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.

Technical terms used in the embodiments of the present invention are only used to illustrate specific embodiments and are not intended to limit the present invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Further, the use of "including" and/or "comprising" in the specification is intended to specify the presence of stated features, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, and/or components.

The corresponding structures, materials, acts, and equivalents of all means or step plus function elements in the claims below, if any, are intended to include any structure, material, or act for performing the function in combination with other claimed elements as specifically claimed. The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limited to the invention in the form disclosed. Various modifications and alterations will become apparent to those skilled in the art without departing from the scope and spirit of this invention. The embodiments described in this application are intended to better explain the principles and the practical application of the invention and to enable others skilled in the art to understand the invention.

The flow chart described in the present invention is merely an example, and various modifications and changes can be made to the drawings or the steps in the present invention without departing from the spirit of the present invention. For instance, the steps may be performed in a differing order, or steps may be added, deleted or modified. It will be understood by those skilled in the art that all or part of the above-described embodiments may be implemented and equivalents thereof may be made to the claims of the present invention while remaining within the scope of the invention.

Claims

1. An electromagnetic flow meter, comprising:

a housing;

2. An electromagnetic flowmeter according to claim 1 wherein at least two of said conduits are spaced apart in parallel or are arranged in a fan-like pattern.

3. An electromagnetic flowmeter according to claim 1 wherein at least two of said conduits are in a linear array.

4. An electromagnetic flowmeter according to claim 1 wherein at least two of said conduits are equally spaced or the spacing between at least two of said conduits varies in a gradual manner.

5. The electromagnetic flowmeter of claim 1 wherein the direction of the magnetic field formed by the pair of excitation coils is substantially perpendicular to the direction of extension of the pipe and substantially perpendicular to the direction of extension of the electrodes.

6. An electromagnetic flowmeter according to claim 1 wherein the direction of extension of said electrodes is substantially perpendicular to the direction of extension of said conduit.

7. An electromagnetic flowmeter according to claim 1 wherein each pair of said electrodes are coaxially disposed, said pair of excitation coils being coaxially disposed, the axial directions of said electrodes, said excitation coils and said pipe being orthogonally disposed.

8. An electromagnetic flowmeter according to claim 1 wherein the axes of said at least two conduits lie in the same plane.

9. An electromagnetic flowmeter according to claim 1 wherein the axes of said at least two pairs of electrodes lie in the same plane.

10. The electromagnetic flowmeter of claim 1 further comprising two electrode plates, each of said electrode plates being in contact with a respective one of said electrodes for collecting signals from said respective one of said electrodes.

11. The electromagnetic flowmeter of claim 10 wherein the two electrode plates are connected by a flexible wiring board, the flexible wiring board being oriented parallel to the direction of the magnetic field.

12. The electromagnetic flowmeter of claim 10, further comprising a main board electrically coupled to each of the two electrode plates for calculating a flow rate of fluid flowing through each of the conduits based on signals collected by the two electrode plates.

13. The electromagnetic flowmeter of claim 12 wherein each of said conduits has first and second conduit connectors connected to respective ends thereof, said first and second conduit connectors being in electrical communication with fluid in said conduit, said first and second conduit connectors being in electrical communication with said housing, respectively, said housing being in electrical communication with said main plate, wherein said first conduit connector, said housing, and said second conduit connector comprise said ground member, and wherein said first conduit connector, said housing, said main plate, and said second conduit connector form a ground path.

14. The electromagnetic flowmeter of claim 1 wherein said excitation coil comprises a core and a coil surrounding said core, said core and said coil having damping plates with silicon steel plates disposed thereon.

15. A spraying device, characterized in that it comprises:

a medicine chest;

at least two water pumps for pumping fluid from the tank;

at least two spray heads for spraying the fluid; and

the electromagnetic flowmeter of any of claims 1 to 14, configured to detect a flow rate of each of the water pumps in real time, wherein each of the pipes of the electromagnetic flowmeter has one end in communication with one of the at least two water pumps and another end in communication with one of the at least two spray heads.

16. A movable platform, comprising:

a movable platform body;

at least one sprinkler according to claim 15 mounted on the movable platform body.

17. The movable platform of claim 16, wherein the movable platform comprises an unmanned aerial vehicle or a ground vehicle.