CN111279159A

CN111279159A - Electromagnetic flow meter and plant protection unmanned aerial vehicle who has this electromagnetic flow meter

Info

Publication number: CN111279159A
Application number: CN201880069256.4A
Authority: CN
Inventors: 黄稀荻; 周乐; 常子敬; 孟祥�
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2018-11-29
Filing date: 2018-11-29
Publication date: 2020-06-12
Anticipated expiration: 2038-11-29
Also published as: CN111279159B; WO2020107334A1

Abstract

An electromagnetic flow meter (4000) and a plant protection unmanned aerial vehicle having the electromagnetic flow meter (4000), the electromagnetic flow meter (4000) comprising: a housing (8) having an accommodation space; a bracket (1) installed in the accommodation space; the pipeline (2) is arranged on the bracket (1), and two open ends of the pipeline (2) are exposed out of the bracket (1); the two electrodes (3) are oppositely arranged on two sides of the bracket (1), the detection ends of the two electrodes (3) respectively penetrate through the side walls of the bracket (1) and the pipeline (2) and then are contacted with liquid flowing through the pipeline (2), and the detection ends of the two electrodes (3) are oppositely arranged; the two signal acquisition plates (4) are arranged on the same side of the bracket (1) corresponding to the two electrodes (3) and are used for acquiring signals of the electrodes (3) on the corresponding side; the two coil assemblies (5) are oppositely arranged on the other two sides of the bracket (1); at least one signal acquisition board (4) is provided with a grounding jack (61), the electromagnetic flowmeter (4000) further comprises a grounding connecting piece (500), and the grounding connecting piece (500) penetrates through the grounding jack (61) and is fixed on the inner side wall of the shell (8) so that the shell (8) is grounded.

Description

Electromagnetic flow meter and plant protection unmanned aerial vehicle who has this electromagnetic flow meter

Technical Field

The invention relates to the field of flow detection, in particular to an electromagnetic flowmeter and a plant protection unmanned aerial vehicle with the same.

Background

The electromagnetic flowmeter is an instrument for measuring water flow by using an electromagnetic induction principle to generate induced electromotive force according to the fact that a conductor flows through an external magnetic field, and is widely applied to scenes such as agricultural plant protection operation, food processing, industrial solvent filling and the like. In the related art, in order to reduce the interference of the external signal, the electromagnetic flowmeter is sealed in an electromagnetic shield case, and the external signal is prevented from interfering with the internal circuit of the electromagnetic flowmeter by the electromagnetic shield case. However, the additional electromagnetic shield can lead to the volume and the weight greatly increased of electromagnetic flowmeter, be unfavorable for using like plant protection unmanned aerial vehicle to the equipment that is more sensitive to volume and weight.

Disclosure of Invention

The invention provides an electromagnetic flowmeter and a plant protection unmanned aerial vehicle with the same.

Specifically, the invention is realized by the following technical scheme:

according to a first aspect of the present invention, there is provided an electromagnetic flow meter comprising:

a housing having a receiving space;

a bracket installed in the accommodating space;

the pipeline is arranged on the bracket, and two opening ends of the pipeline are exposed out of the bracket;

the two electrodes are oppositely arranged on two sides of the bracket, detection ends of the two electrodes can be contacted with liquid flowing through the pipeline after respectively penetrating through the bracket and the side wall of the pipeline, and the detection ends of the two electrodes are oppositely arranged;

the two signal acquisition boards and the two electrodes are correspondingly arranged on the same side of the bracket, and the signal acquisition boards are used for acquiring signals of the electrodes on the corresponding sides; and

the two coil assemblies are oppositely arranged on the other two sides of the bracket and are used for generating electromagnetic fields;

the electromagnetic flowmeter further comprises a grounding connecting piece, wherein at least one signal acquisition board is provided with a grounding jack, and the grounding connecting piece penetrates through the grounding jack to be fixed on the inner side wall of the shell, so that the shell is grounded.

According to a second aspect of the present invention, there is provided a plant protection drone, the plant protection drone comprising:

a frame;

the spraying assembly is arranged on the rack;

a medicine box mounted on the frame; and

an electromagnetic flowmeter for detecting the spray flow of the spray assembly in real time,

the electromagnetic flowmeter comprises a shell, a bracket, a pipeline, two electrodes, two signal acquisition boards, two coil assemblies and a grounding connecting piece;

the housing has a receiving space, and the bracket is mounted in the receiving space;

the pipeline is arranged on the bracket, two opening ends of the pipeline are exposed out of the bracket, one opening end of the pipeline is communicated with the spraying assembly through a flow guide pipe, and the other opening end of the pipeline is communicated with the pesticide box through a flow guide pipe;

the two signal acquisition plates and the two electrodes are correspondingly arranged on the same side of the bracket, and the signal acquisition plates are used for acquiring signals of the electrodes on the corresponding sides;

the two coil assemblies are oppositely arranged on the other two sides of the bracket and used for generating an electromagnetic field;

at least one of the signal acquisition boards is provided with a grounding jack, and the grounding connecting piece penetrates through the grounding jack and is fixed on the inner side wall of the shell, so that the shell is grounded.

According to the technical scheme provided by the embodiment of the invention, the grounding of the shell is realized through the matching of the grounding jack and the grounding connecting piece, and the shell can play a role of electromagnetic shielding.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

FIG. 1 is a structurally broken away view of an electromagnetic flow meter in one embodiment of the invention;

FIG. 2 is a structurally broken away view of the electromagnetic flowmeter of the embodiment of FIG. 1 in another orientation;

FIG. 3 is a perspective view of the electromagnetic flow meter of the embodiment shown in FIG. 1;

FIG. 4 is a cross-sectional view of an electromagnetic flow meter in an embodiment of the invention;

FIG. 5 is an enlarged partial view of the electromagnetic flow meter of the embodiment shown in FIG. 4;

FIG. 6 is a perspective view of an electrode in an embodiment of the present invention;

FIG. 7 is a perspective view of an electrode mounting plate in an embodiment of the present invention;

FIG. 8 is a schematic assembled view of a portion of the structure of an electromagnetic flow meter in an embodiment of the invention;

FIG. 9 is a schematic view of the electromagnetic flowmeter of the embodiment of FIG. 8 in another orientation;

FIG. 10 is a schematic view of the electromagnetic flowmeter of the embodiment of FIG. 8 in a further orientation;

FIG. 11 is a schematic view of the electromagnetic flowmeter of the embodiment of FIG. 8 in a further orientation;

FIG. 12 is a cross-sectional schematic view of an electromagnetic flow meter in an embodiment of the invention;

FIG. 13 is an enlarged partial view of the electromagnetic flow meter of the embodiment of FIG. 12;

FIG. 14 is another enlarged partial view of the electromagnetic flow meter of the embodiment of FIG. 12;

FIG. 15 is a perspective view of a portion of an electromagnetic flow meter in an embodiment of the invention;

fig. 16 is a perspective view of a plant protection drone in an embodiment of the present invention.

Reference numerals: 1000: a frame; 1100: a body; 1200: a foot rest; 1300: a horn; 2000: a spray assembly; 3000: a medicine chest; 4000: an electromagnetic flow meter; 1: a support; 11: an electrode mounting hole; 12: a containing groove; 13: a positioning and matching part; 2: a pipeline; 3: an electrode; 31: an electrical connection hole; 32: a boss; 33: a first step portion; 4: a signal acquisition board; 41: a conductive via; 5: a coil assembly; 51: a helical coil; 511: an iron core; 512: a coil; 52: a coil fixing plate; 6: a control panel; 61: a ground jack; 62: a second electrical connection portion; 7: an electrode fixing plate; 71: a first through hole; 72: positioning holes; 8: a housing; 81: a housing; 811: a second mounting boss; 8111: mounting grooves; 812: a second mounting hole; 82: a cover plate; 821: a second positioning portion; 822: a grounding projection; 823: a first mounting boss; 824: a first mounting hole; 825: an interface; 9: a signal line; 10: a first seal ring; 20: a first seal member; 30: a second seal member; 40: a second seal ring; 50: a third seal member; 100: a first pipe connector; 110: a third step portion; 120: a first mounting portion; 200: a second pipe joint; 210: a fourth step portion; 220: a second mounting portion; 300: an electric plug; 400: a conductive connection member; 500: a ground connection.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The electromagnetic flow meter and the plant protection unmanned aerial vehicle with the electromagnetic flow meter are described in detail below with reference to the attached drawings. The features of the following examples and embodiments may be combined with each other without conflict.

With reference to fig. 1 to 4, an embodiment of the present invention provides an electromagnetic flowmeter, and the electromagnetic flowmeter 4000 may include a support 1, a pipe 2, an electrode 3, a signal acquisition board 4, and a coil assembly 5. Wherein, the pipeline 2 is arranged on the bracket 1, and two open ends of the pipeline 2 are exposed out of the bracket 1. The pipeline 2 of this embodiment is used for supplying liquid (for example when electromagnetic flowmeter 4000 is used on plant protection unmanned aerial vehicle, liquid can be water or liquid pesticide) to flow through, and is optional, and the pipeline 2 of this embodiment is a straight pipeline 2, and two open ends of pipeline 2 expose from two relative lateral walls of support 1 respectively. Optionally, the material of the pipeline 2 is the same as that of the bracket 1, and the pipeline 2 and the bracket 1 are integrally formed.

The electrodes 3 of the embodiment comprise two electrodes 3, the two electrodes 3 are oppositely arranged at two sides of the bracket 1, the detection ends of the two electrodes 3 can be contacted with the liquid flowing through the pipeline 2 after respectively penetrating through the bracket 1 and the side wall of the pipeline 2, and the detection ends of the two electrodes 3 are oppositely arranged.

Furthermore, the signal acquisition boards 4 also include two, and two signal acquisition boards 4 and two electrodes 3 correspond and set up in the same one side of support 1, and signal acquisition board 4 is used for gathering the signal that corresponds side electrode 3. In this embodiment, the signal acquisition plate 4 on each side acquires the signal of the electrode 3 on the corresponding side, so that signal interference can be reduced. After the signal acquisition board 4 of this embodiment acquires the signal of the corresponding electrode 3, the signal acquired can be amplified, filtered, etc., so as to reduce the noise of the signal, for example, if the signal acquisition board 4 is provided with a differential circuit, the signal of the electrode 3 acquired by the signal acquisition board 4 can be subjected to common mode noise removal by the differential circuit.

Furthermore, the coil assemblies 5 of the present embodiment also include two coil assemblies 5, and the two coil assemblies 5 are oppositely disposed on the other two sides of the bracket 1. In the present embodiment, two coil assemblies 5 are used to generate an electromagnetic field, which is an alternating magnetic field, and the electromagnetic field generated by the two coil assemblies 5 can pass through the pipe 2 into the pipe 2. When the flow rate of the liquid flowing through the pipeline 2 changes, the difference of the induced electromotive forces of the two electrodes 3 also changes under the action of the electromagnetic field.

The structural layout mode of the bracket 1, the electrode 3, the signal acquisition board 4 and the coil assembly 5 increases the compactness among the structures, thereby reducing the volume of the electromagnetic flowmeter 4000 and lightening the weight of the electromagnetic flowmeter 4000.

In some embodiments, the electromagnetic flow meter 4000 further comprises a control board 6, the control board 6 is electrically coupled to the two signal collecting boards 4, and the control board 6 can obtain the flow rate and/or velocity of the liquid flowing through the pipeline 2 according to the signals collected by the two signal collecting boards 4. Optionally, the control board 6 and one of the signal acquisition boards 4 are integrated on the same circuit board, and the integration 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 reducing the volume of the electromagnetic flowmeter 4000 and reducing the weight of the electromagnetic flowmeter 4000. Optionally, the control board 6 and one of the signal acquisition boards 4 are disposed on the same side of the bracket 1, and the control board 6 and the signal acquisition board 4 on the same side are fixedly connected by a fixing connector (e.g., a threaded fastener such as a screw or a bolt) to form an integral structure, so as to increase the compactness of the structure and reduce the volume of the electromagnetic flowmeter 4000.

In other embodiments, the function of the control board 6 is integrated on one of the signal collecting boards 4, and the two signal collecting boards 4 are electrically coupled, in this embodiment, the signal collecting board 4 integrated with the function of the control board 6 obtains the flow rate and/or velocity of the liquid flowing through the pipeline 2 according to the signals collected by the two signal collecting boards 4.

The calculation formula of the flow rate Q of the liquid flowing through the pipeline 2 is as follows:

in the formula (1), B is the magnetic field intensity; 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 a correction coefficient, and the magnitude of k can be set in consideration of factors such as the fact that the velocity of the liquid in the pipe 2 is not uniform, thereby reducing the error between the flow rate Q of the liquid flowing through the pipe 2 obtained by the calculation of the formula (1) and the flow rate of the liquid actually flowing through the pipe 2.

Alternatively, k is approximately 0.8, for example, k may be 0.8 ± 0.05. For a particular size of electromagnetic flowmeter 4000 for a particular operating condition, the magnitude of k can be calibrated by volumetric means (the volume of liquid flowing through the pipe 2 over a period of time).

After calculating the flow rate Q of the liquid flowing through the pipe 2 according to the formula (1), the velocity of the liquid flowing through the pipe 2 can be calculated from the flow rate Q of the liquid flowing through the pipe 2.

Optionally, the bracket 1 is made of plastic, so that a magnetic field can penetrate through the bracket conveniently, and the weight of the electromagnetic flowmeter 4000 can be reduced. Of course, the material of the bracket 1 is not limited to plastic, and other materials which are light and easy to penetrate the magnetic field can be selected. Optionally, the bracket 1 may be in a square shape such as a cube or a cuboid, or in other regular shapes, and the shape of the bracket 1 may be specifically designed as required.

The following examples further illustrate the structure of the electromagnetic flowmeter 4000 by taking the bracket 1 as an example.

In this embodiment, the support 1 may include a first sidewall and a second sidewall oppositely disposed, wherein one electrode 3 is disposed on one side of the first sidewall, and the other electrode 3 is disposed on one side of the second sidewall. The first side wall and the second side wall are respectively provided with an electrode mounting hole 11, a through hole is formed in the position, corresponding to the electrode mounting hole 11, of the side wall of the pipeline 2, and the electrode mounting hole 11 is communicated with the corresponding through hole. The detection end of one of the electrodes 3 is at least partially exposed in the pipeline 2 after passing through the electrode mounting hole 11 of the first side wall and the corresponding through hole. The detection end of the other electrode 3 is at least partially exposed in the pipeline 2 after passing through the electrode mounting hole 11 of the second side wall and the corresponding through hole.

If the electrode 3 is not tightly sealed with the electrode mounting hole 11, the liquid in the pipe 2 may leak through the electrode mounting hole 11 and enter the signal collection plate 4, which may cause a short circuit of the signal collection plate 4. Therefore, to prevent the liquid in the pipe 2 from leaking, in some embodiments, the outer side wall of the detection end of the electrode 3 abuts against the side wall of the through-hole. In other embodiments, the outer sidewall of the detection end of the electrode 3 is not connected to the sidewall of the through hole in an abutting manner, but a sealing ring is disposed between the detection end of the electrode 3 and the sidewall of the through hole, and the sealing ring may be a rubber sealing ring or a sealing ring made of other materials.

Optionally, with reference to fig. 5 and 6, a first step portion 33 is disposed at the detection end of the electrode 3, a second step portion (not labeled) is correspondingly disposed on a side wall of the through hole, the first step portion 33 and the second step portion are in abutting fit, and the electrode 3 is limited by the second step portion, so that the electrode 3 is prevented from being mounted excessively.

In some embodiments, referring to fig. 4, the electromagnetic flowmeter 4000 is further provided with a first sealing ring 10, the first sealing ring 10 is sleeved on the electrode 3, and the first sealing ring 10 is used for sealing a gap between the electrode 3 and the side wall of the electrode mounting hole 11, so as to further prevent liquid in the pipeline 2 from leaking. Specifically, a first sealing ring 10 is arranged 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, and the material of the first sealing ring 10 is not particularly limited in the embodiment of the present invention.

Further, with reference to fig. 4 to 6, 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 step surface, the boss 32 is in contact with the step surface, and the first seal ring 10 is provided on the side of the boss 32 away from the detection end of the electrode 3, thereby preventing the liquid from leaking from the electrode mounting hole 11.

Alternatively, the electrode 3 includes a plurality of cylindrical bodies with different diameters, as shown in fig. 6, the diameter of the portion of the electrode 3 between the end surface of the detection end and the end surface of the first step portion 33 < the diameter of the portion of the electrode 3 between the end surface of the first step portion 33 and the end surface of the boss 32 < the diameter of the portion of the electrode 3 between the end surface of the boss 32 and the end surface of the tail end of the electrode 3. Wherein, the tail end of the electrode 3 and the detection end of the electrode 3 are respectively positioned at two ends of the electrode 3.

In this embodiment, the electrode 3 can be taken out from the electrode mounting hole 11, which facilitates the maintenance and replacement of the electrode 3.

In order to make the two electrodes 3 generate induced electromotive force better, in some embodiments, the two electrodes 3 are arranged coaxially, i.e., the detection ends of the two electrodes 3 face each other. Further, the two coil assemblies 5 are also coaxially arranged. Alternatively, the axial direction of the electrode 3 is perpendicular to the axial direction of the coil block 5.

In addition, in order to position the electrode 3 in the holder 1 and prevent the electrode 3 from falling from the electrode mounting hole 11, optionally, in combination with fig. 1, 2, 4, 5 and 7, the electromagnetic flowmeter 4000 may further include two electrode fixing plates 7, where the electrode fixing plates 7 of the present embodiment include two electrode fixing plates 7, and the two electrode fixing plates 7 are used to fix the two electrodes 3 on the corresponding side walls of the holder 1, respectively.

Specifically, the electrode fixing plate 7 abuts against the electrode 3, and the electrode fixing plate 7 is mounted on the side wall of the bracket 1 through a quick release connector, so that the electrode 3 is positioned in the bracket 1. In the embodiment, the electrode fixing plate 7 is matched with the quick-release connecting piece, so that the electrode 3 is positioned in the bracket 1, and the electrode 3 is prevented from falling; and, install electrode fixing plate 7 on support 1 through quick detach spare, when electrode 3 needs to be changed or the maintenance, can directly dismantle quick detach connecting piece from support 1 to take out electrode 3 fast, convenient operation is swift.

The type of the quick release connector can be selected according to the requirement, and the quick release connector of the embodiment can include at least one of the following: threaded fasteners, snaps. Wherein the threaded fastener may be a screw or a bolt. It is understood that the type of quick release connector is not limited thereto, and other quick release configurations are possible.

Referring to fig. 7, the electrode fixing plate 7 of the present embodiment further includes a positioning hole 72, a first positioning portion is disposed at a corresponding position of the bracket 1, and the quick release member is fixed on the first positioning portion after penetrating through the positioning hole 72. Alternatively, the positioning hole 72 may include a plurality of positioning holes 72, for example, two positioning holes 72 may be provided at both sides of the first through hole 71, so as to more firmly fix the electrode fixing plate 7 to the support 1. Alternatively, referring to fig. 2, the side wall of the bracket 1 is provided with a receiving groove 12, and the electrode fixing plate 7 is mounted in the receiving groove 12, so that the electrode fixing plate 7 is more firmly mounted on the bracket 1.

The electrode holder plate 7 may be made of plastic or other light materials to reduce the weight of the electromagnetic flowmeter 4000.

In some embodiments, referring to fig. 7, 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 7 can position the electrode 3 in the bracket 1 more firmly by a sleeving fit manner, so as to prevent the electrode 3 from shaking. Optionally, a sleeve portion (not shown) is disposed on the end surface of the tail end of the electrode 3, and the electrode fixing plate 7 is sleeved on the sleeve portion through the first through hole 71. Considering further the compactness of the structural layout, optionally, the electrode fixing plate 7 is sandwiched between the electrode 3 and the signal collecting plate 4 on the corresponding side.

As a possible implementation manner, the signal acquisition board 4 and the electrode 3 on the corresponding side may be electrically coupled in a direct contact manner, for example, the signal acquisition board 4 is provided with a first electrical connection portion, the electrode 3 is provided with a first electrical mating portion, and the first electrical connection portion and the first electrical mating portion are connected in an insertion manner or a butt-joint manner to achieve the electrical coupling connection between the signal acquisition board 4 and the electrode 3 on the corresponding side.

As another possible implementation manner, the signal collecting plate 4 and the electrode 3 on the corresponding side may be electrically coupled by using an indirect connection manner, and optionally, in conjunction with fig. 1 and fig. 6, the tail end of the electrode 3 is provided with an electrical connection hole 31, and the signal collecting plate 4 is provided with a conductive hole 41. The electromagnetic flow meter 4000 may further include a conductive connector 400, wherein the conductive connector 400 includes two. The two conductive connecting members 400 are respectively matched with the conductive holes 41 of the signal acquisition plates 4 on the corresponding sides and the electric connection holes 31 of the electrodes 3, and specifically, the conductive connecting members 400 are fixedly connected with the electric connection holes 31 after penetrating through the conductive holes 41, so that the electrodes 3 and the signal acquisition plates 4 on the corresponding sides are electrically coupled. In the embodiment, the signal acquisition board 4 and the electrode 3 are fixedly connected through the conductive connecting piece 400, so that the stability of the electrical coupling connection between the signal acquisition board 4 and the electrode 3 is ensured. Alternatively, the conductive connector 400 is a threaded fastener, such as a conductive screw or a conductive bolt. Alternatively, the electric connection hole 31 and the conductive hole 41 are respectively provided therein with an electric contact terminal, and both ends of the conductive connection member 400 are respectively in electric contact with the electric contact terminal of the electric connection hole 31 and the electric contact terminal of the conductive hole 41.

Alternatively, the signal acquisition board 4 is fixed to the bracket 1 by fasteners, which may be screws, bolts or other quick-release members.

The bracket 1 of the present embodiment may further include a third sidewall and a fourth sidewall which are oppositely disposed, wherein one coil assembly 5 is disposed on one side of the third sidewall, and the other coil assembly 5 is disposed on one side of the fourth sidewall. 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, and the arrangement mode of the electrode 3 and the coil assembly 5 in the embodiment is adopted, so that the structure of the electromagnetic flowmeter 4000 is more compact, and the size of the electromagnetic flowmeter 4000 is reduced.

Referring to fig. 1, 2 and 4, the coil assembly 5 may include a spiral coil 51 and a coil fixing plate 52, the spiral coil 51 includes a core 511 and a coil 512 wound on the core 511, the coil fixing plate 52 is fixedly connected to corresponding sidewalls of the bracket 1, and the coil fixing plate 52 and the corresponding sidewalls of the bracket 1 surround to form a receiving space in which the core 511 and the coil 512 are received, thereby sealing the electromagnetic field in the bracket 1 through the coil fixing plate 52. Optionally, the coil fixing plate 52 is a metal plate, such as an iron plate or a steel plate, and the metal plate can shield the electromagnetic field generated by the coil assembly 5, so as to seal the electromagnetic field in the bracket 1.

In this embodiment, the bracket 1 may further include a fifth sidewall and a sixth sidewall which are oppositely disposed, one of the open ends of the duct 2 extends from the fifth sidewall, and the other open end of the duct 2 extends from the sixth sidewall. In this embodiment, the arrangement direction of the first sidewall and the second sidewall, the arrangement direction of the third sidewall and the fourth sidewall, and the arrangement direction of the fifth sidewall and the sixth sidewall are perpendicular to each other, respectively.

Optionally, the pipe 2 is a pipe 2, and the axis of the spiral coil 51 is arranged substantially perpendicular to the extending direction of the pipe 2, so that the structural layout of the electromagnetic flowmeter 4000 is more compact.

Referring to fig. 1 to 3, the electromagnetic flowmeter 4000 further includes a housing 8, the housing 8 having a receiving space, and the holder 1 being mounted in the receiving space. Optionally, the housing 8 includes a housing 81 and a cover plate 82, an opening is disposed on one side of the housing 81, the cover plate 82 is used for covering the opening, and the bracket 1, the electrode 3, the signal acquisition board 4, the coil assembly 5 and the control board 6 are disposed in the housing 81.

In some embodiments, cover 82 is fixedly attached to frame 1. Optionally, a second positioning portion 821 is disposed on the cover plate 82, a positioning matching portion 13 is disposed on the bracket 1, and the second positioning portion 821 is connected to the positioning matching portion 13, so that the cover plate 82 is fixedly connected to the bracket 1. The second positioning portion 821 and the positioning matching portion 13 can be matched by plugging or other methods.

In addition, the material of the housing 81 and the cover plate 82 can be selected according to the requirement, and optionally, the cover plate 82 and/or the housing 81 are of an aluminum structure, such as an aluminum alloy. Further, the outer surface of the cover plate 82 and/or the housing 81 may be coated using laser etching technology to prevent corrosion of the cover plate 82 and/or the housing 81.

In some embodiments, cover plate 82 is in electrically conductive contact with housing 81, and optionally, cover plate 82 is in direct contact with housing 81 to make electrical contact. Further, with reference to fig. 8 to 11, the signal acquisition board 4 and/or the control board 6 are provided with a ground jack 61, and the electromagnetic flowmeter 4000 of the present embodiment may further include a ground connector 500, where the ground connector 500 is fixed on the inner side wall of the housing 8 through the ground jack 61, for example, the ground connector 500 is fixed on the cover plate 82 through the ground jack 61, so that the cover plate 82 and the housing 81 are grounded. This embodiment passes through the cooperation of ground connection jack 61 and ground connection connecting piece 500, realizes the ground connection of shell 8, and shell 8 can play electromagnetic shield's effect, and this embodiment can avoid signal acquisition board 4, control panel 6 etc. to receive external signal interference through the ground connection of shell 8 under the condition that does not increase extra electromagnetic shield cover, and the mode that shell 8 ground connection realized the electromagnetic shield can not increase electromagnetic flowmeter's volume and weight, and electromagnetic flowmeter's application scope is wide.

Optionally, the ground connector 500 is a threaded fastener, such as a screw or bolt.

As a feasible implementation manner, the grounding jacks 61 are disposed on the signal acquisition boards 4, optionally, one of the signal acquisition boards 4 is disposed adjacent to the cover plate 82, and the grounding jack 61 is disposed on the signal acquisition board 4 disposed adjacent to the cover plate 82, so that the grounding connector 500 is convenient to connect the grounding jack 61 and the housing 8.

As another possible implementation, the ground jack 61 is disposed on the control board 6, and optionally, the control board 6 is disposed adjacent to the cover plate 82, so as to facilitate the ground connector 500 to connect the ground jack 61 and the housing 8.

Optionally, with reference to fig. 9 to 11 and fig. 15, the cover plate 82 is provided with a grounding protrusion 822 facing the side wall of the opening, the grounding connector 500 passes through the grounding jack 61 and then is detachably connected to the grounding protrusion 822, the control board 6 and the grounding protrusion 822 are detachably connected through the grounding connector 500, and when the signal acquisition board 4 or the control board 6 needs to be maintained, the grounding connector 500 is directly detached from the grounding protrusion 822, which is convenient and fast.

In addition, if the joint between housing 81 and cover plate 82 is not sealed well, and water (mainly moisture in the air) flows into housing 81 from the gap between the opening periphery of housing 81 and cover plate 82, signal acquisition board 4 and control board 6 in housing 81 may be short-circuited by water, and other components in housing 81 may be damaged by water, and electromagnetic flowmeter 4000 may be damaged. In this regard, in conjunction with fig. 12 and 13, the junction of the housing 81 and the cover plate 82 is provided with a first seal 20, and this first seal 20 is used to prevent water (mainly moisture in the air) from flowing into the housing 81 from the gap between the opening periphery of the housing 81 and the cover plate 82. The first sealing member 20 may be a rubber sealing member, or may be a sealing member made of other materials, and the material of the first sealing member 20 is not particularly limited in the embodiment of the present invention.

Alternatively, one of the open ends of the duct 2 extends from the side wall of the housing 81 opposite the opening, and the other open end of the duct 2 extends from the cover 82. It will be appreciated that the two open ends of the conduit 2 may also extend from other locations of the housing 8.

With reference to fig. 1 to 3 and 8 to 12, the electromagnetic flowmeter 4000 of this embodiment may further include a first pipe connector 100 and a second pipe connector 200, where the first pipe connector 100 is connected to one of the open ends of the pipe 2, and the second pipe connector 200 is connected to the other open end of the pipe 2. The first pipe joint 100 and the second pipe joint 200 can be connected with an external structure, so that the electromagnetic flowmeter 4000 can be connected with the external structure.

In the existing electromagnetic flowmeter, the potentials of the liquid flowing through the pipeline at different positions of the pipeline may be different, and the potential benchmarks referred to when the two electrodes detect may be inconsistent, so that the measurement accuracy is low. In this embodiment, the first pipe connector 100 is fixedly connected to the cover plate 82, and the first pipe connector 100 is electrically connected to the cover plate 82 and grounded. Further, the second pipe connector 200 is fixedly connected to the housing 81, and the second pipe connector 200 is electrically connected to the housing 81 and grounded. The first pipe connector 100 and the second pipe connector 200 are grounded, so that the liquid potential in the pipe 2 is 0, and the two electrodes 3 detect electromotive force by using the 0 potential of the liquid as a reference, thereby improving the detection precision. In addition, if the first pipe connector 100 and the second pipe connector 200 are connected to the opening end of the pipe 2, they are easy to fall off, in this embodiment, the first pipe connector 100 is fixed on the cover plate 82, and the second pipe connector 200 is fixed on the housing 81, so that the first pipe connector 100 and the second pipe connector 200 can be prevented from falling off, and the stability of the electromagnetic flowmeter 4000 is improved.

The fixed connection mode between the first pipe connector 100 and the cover plate 82 can be designed as required, for example, in an embodiment, with reference to fig. 12 and 13, a first mounting boss 823 is arranged on the cover plate 82, a second through hole is arranged in the first mounting boss 823, the second through hole is communicated with one of the opening ends of the pipe 2, and the first pipe connector 100 is sleeved on the first mounting boss 823. In this embodiment, since the first mounting boss 823 is provided on the cover plate 82, the first mounting boss 823 is also grounded. First pipe connector 100 is nested on first installation boss 823 and realizes the electric conduction between first pipe connector 100 and first installation boss 823 to realize the ground connection of first pipe connector 100. In addition, the first pipe connector 100 is sleeved on the first mounting boss 823, so that the first pipe connector 100 can be stably fixed on the cover plate 82. Optionally, the first mounting boss 823 is circular.

Optionally, the inner side wall of the first pipe joint 100 is provided with a third step portion 110, and the third step portion 110 abuts against the end face of the top end of the first mounting boss 823, so that the first pipe joint 100 and the first mounting boss 823 can be mounted in place. Further, third step portion 110 and first installation boss 823 are equipped with second sealing member 30 between the terminal surface of the open end far away from pipeline 2, and this second sealing member 30 is used for preventing water in pipeline 2 from flowing into casing 81 from the clearance between first pipe connector 100 and first installation boss 823, and then has avoided signal acquisition board 4, control panel 6 etc. in casing 81 to meet the water short circuit, and has avoided other parts in casing 81 to meet the water damage. The second sealing member 30 may be a rubber sealing member, or may be a sealing member made of other materials, and the material of the second sealing member 30 is not particularly limited in the embodiment of the present invention.

Optionally, the cover plate 82 is provided with a plurality of first mounting holes 824, the first pipe joint 100 includes a first mounting portion 120, and the first mounting portion 120 is respectively and fixedly connected to the plurality of first mounting holes 824 through a threaded fastener, so as to achieve stable connection between the first pipe joint 100 and the cover plate 82. The plurality of first mounting holes 824 are spaced apart so that the first pipe 2 can be more stably coupled to the cover plate 82 from various orientations. Wherein the threaded fastener may be a screw or a bolt.

The fixing connection between the second pipe connector 200 and the housing 81 can also be designed according to the requirement, for example, in an embodiment, with reference to fig. 12 and 14, a second mounting boss 811 is provided on the housing 81, the second mounting boss 811 is provided with a third through hole, and the second pipe connector 200 is sleeved on the second mounting boss 811. In this embodiment, since second mounting boss 811 is provided on housing 81, second mounting boss 811 is also grounded. The second pipe connector 200 is fitted over the second fitting boss 811 to achieve electrical conduction between the second pipe connector 200 and the second fitting boss 811, thereby achieving grounding of the second pipe connector 200. In addition, second pipe joint 200 is fitted over second fitting boss 811, and second pipe joint 200 can be stably fixed to housing 81. Optionally, the second mounting boss 811 is annular.

Optionally, a second sealing ring 40 is disposed between an inner side wall of second pipe connector 200 and an outer side wall of second mounting boss 811, and second sealing ring 40 is used to prevent water from flowing into housing 81 from the outside of housing 81 through a gap between first pipe connector 100 and second mounting boss 811, so as to prevent signal collecting board 4, control board 6 and the like in housing 81 from being short-circuited when encountering water, and prevent other components in housing 81 from being damaged when encountering water. Alternatively, referring to fig. 14, an outer sidewall of the second mounting boss 811 is provided with a mounting groove 8111, and the second sealing ring 40 is received in the mounting groove 8111. The second sealing ring 40 may be a rubber sealing ring, or a sealing ring made of other materials, and the material of the second sealing ring 40 is not particularly limited in the embodiment of the present invention.

Optionally, the inner side wall of the second pipe joint 200 is provided with a fourth step portion 210, and the fourth step portion 210 abuts against the end surface of the top end of the second mounting boss 811, so as to ensure that the second pipe joint 200 and the second mounting boss 811 can be mounted in place. Further, a third sealing element 50 is arranged between the top ends of the fourth step portion 210 and the second mounting boss 811, so as to prevent water in the pipe 2 from flowing into the housing 81 from the gap between the second pipe connector 200 and the second mounting boss 811, thereby preventing the signal acquisition board 4, the control board 6 and the like in the housing 81 from being short-circuited when encountering water, and preventing other components in the housing 81 from being damaged when encountering water. The third sealing member 50 may be a rubber sealing member, or may be a sealing member made of other materials, and the material of the third sealing member 50 is not particularly limited in the embodiment of the present invention.

Optionally, the housing 81 is provided with a plurality of second mounting holes 812, and the second pipe joint 200 includes a second mounting portion 220; the second mounting portion 220 is fixedly connected to the second mounting holes 812 by means of screw fasteners, respectively, so as to stably connect the second pipe connector 200 to the housing 81. The plurality of second mounting holes 812 are spaced apart to more stably fix the second pipe joint 200 to the housing 81 from various orientations. Wherein the threaded fastener may be a screw or a bolt.

In addition, the first pipe connector 100 and the second pipe connector 200 of the present embodiment may be made of stainless steel, which is not easily oxidized, so as to prevent the first pipe connector 100 and the second pipe connector 200 from being oxidized and conductive. If the first pipe joint 100 and the second pipe joint 200 are electrically conductive, the detection reference of the two electrodes 3 is not 0 potential, and the detection reference of the two electrodes 3 may also change with the passage of time, resulting in a decrease in the detection accuracy of the electromagnetic flowmeter 4000. Of course, the first pipe joint 100 and the second pipe joint 200 may be made of other materials that are not easily oxidized.

Optionally, the contact portions of the first pipe connector 100 and the second pipe connector 200 with the cover plate 82 and the housing 81 are passivated to prevent the first pipe connector 100 and the second pipe connector 200 from being oxidized and conducting.

With reference to fig. 1 to 3, 8 to 11, and 15, the electromagnetic flow meter 4000 of the present embodiment further includes an electrical plug 300, where the electrical plug 300 is used to connect an external power source, so that the electromagnetic flow meter 4000 is powered on. Optionally, with reference to fig. 1 and fig. 15, the control board 6 is provided with a second electrical connection portion 62, the cover 82 is provided with a socket 825, the second electrical connection portion 62 is received in the socket 825, and the electrical plug 300 and the second electrical connection portion 62 are inserted into and mated in the socket 825.

Because two electrodes 3 must be located the electromagnetic field both sides, and the signal of two electrodes 3 need correspond the signal acquisition board 4 of side respectively and amplify and/or fall the noise processing, the signal that two signal acquisition boards 4 gathered need finally be gathered to control panel 6 and can realize handling. Since the two signal acquisition boards 4 are also oppositely arranged on two sides of the bracket 1, one signal acquisition board 4 needs to be connected to the control board 6 through the signal wire 9, and due to structural limitation, the signal wire 9 can cross the electromagnetic field, which can cause a closed conductor loop to exist in the electromagnetic field. And because the electromagnetic field in the electromagnetic flowmeter is an alternating magnetic field, if the plane formed by the conductor loops is not parallel to the direction of the magnetic field, the interference is called differential interference, and the interference is influenced by the changed magnetic field to generate induced electromotive force to interfere the measurement signal. The existence of differential interference can affect the stability of a flow velocity signal and reduce the measurement accuracy, an effective solution is lacked in the industry for a long time, and the problem cannot be solved well by means of manual adjustment, software evasion and the like.

At present, most of electromagnetic flowmeters are designed to finely adjust the mechanical structure of the position of a signal wire, and after the electromagnetic flowmeters are assembled, differential interference signals are observed manually, and the mechanical structure is finely adjusted manually, so that the interference signals are reduced. The method has low efficiency, the adjusting effect is difficult to accurately evaluate, and the method is not suitable for large-scale use of mass production products.

Manual fine adjustment can only be used in small-batch customized flowmeter manufacturing, and the scheme cannot realize large-scale mass production, cannot ensure the consistency of products, and cannot use objective indexes to measure the effectiveness of adjustment; the software evasion method avoids interfering signal time by setting accurate sampling time, shortens the sampling time of effective signals, and limits the upper limit of excitation frequency if interference cannot be effectively inhibited in a high-frequency excitation scene, and seriously affects signal measurement if the interference is too large particularly under the condition that signals are weak in a micro electromagnetic flowmeter.

In contrast, the embodiment of the invention reduces the projection area of the conductor loop formed by the signal wire in the electromagnetic field direction as much as possible by adjusting the direction of the signal wire, suppresses differential interference within a reasonable range to reduce the interference degree, effectively controls the difference among individuals, and ensures that the difference of the assembled flowmeter is smaller.

With reference to fig. 1 and 9 to 11, the electromagnetic flowmeter 4000 may further include a signal line 9, both ends of the signal line 9 are electrically coupled to the two signal collecting boards 4 (one of the signal collecting boards 4 is also the control board 6), respectively, the two spiral coils 51 of the present embodiment are coaxially arranged, the arrangement direction of the signal line 9 intersects with the axes of the two spiral coils 51, and the signal line 9 is disposed around the outside of the end of one of the coil assemblies 5. The signal line 9 and the two signal acquisition boards 4 form a structure similar to a 'door'.

It should be noted that, in the embodiment of the present invention, the arrangement direction of the signal line 9 refers to an extending direction of the signal line 9 for connecting two connection ends of two signal acquisition boards 4.

According to the embodiment of the invention, through the reasonably designed structure limit between the signal wire 9 and the two signal acquisition boards 4, the projection area of a conductor loop formed by the signal wire 9 in the electromagnetic field direction is reduced as much as possible, the influence of differential interference on signals can be eliminated, the measurement precision of the electromagnetic flowmeter 4000 is improved, the difference among individuals is effectively controlled, the assembled flowmeter is ensured to have small difference, and the signal consistency of the electromagnetic flowmeter 4000 is better.

Alternatively, the pipe 2 is a straight pipe 2, and the signal line 9 is arranged substantially perpendicular to the extending direction of the pipe 2. Because the axis of the spiral coil 51 is perpendicular to the extending direction of the pipeline 2, the central axis of the signal wire 9 is also perpendicular to the axis of the spiral coil 51, and the projection of the conductor loop formed by the signal wire 9 in the electromagnetic field direction is a point, therefore, the structural design mode can minimize the projection area of the conductor loop formed by the signal wire 9 in the electromagnetic field direction, thereby eliminating the influence of differential interference on signals to the maximum extent and improving the measurement accuracy of the electromagnetic flowmeter 4000. It is understood that the signal line 9 is substantially perpendicular to the extending direction of the pipe 2, which means that the included angle between the signal line 9 and the extending direction of the pipe 2 is 90 ° ± error value, i.e. within the allowable error range, the signal line 9 can be considered to be substantially perpendicular to the extending direction of the pipe 2.

Alternatively, the two electrodes 3 are coaxially arranged, and the central axis of the signal line 9 is arranged coplanar with the central axis of the electrodes 3. Because the axis of the spiral coil 51 is perpendicular to the axis of the electrode 3, the axis of the signal wire 9 is also perpendicular to the axis of the spiral coil 51, and the projection of the conductor loop formed by the signal wire 9 in the electromagnetic field direction is a point, the structural design mode can minimize the projection area of the conductor loop formed by the signal wire 9 in the electromagnetic field direction, thereby eliminating the influence of differential interference on the signal to the maximum extent and improving the measurement accuracy of the electromagnetic flowmeter 4000.

Optionally, the signal line 9 has a preset width and a preset length, the width direction of the signal line 9 is parallel to the extending direction of the pipeline 2, and the layout mode can also enable the central axis of the signal line 9 to be perpendicular to the axis of the spiral coil 51, so that the influence of differential interference on the signal is eliminated to the maximum extent, and the measurement accuracy of the electromagnetic flowmeter 4000 is improved. It should be noted that, in the embodiment of the present invention, the width of the signal line 9 refers to a width of the signal line 9 perpendicular to the arrangement direction of the signal line 9. Wherein 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 wire 9 can be designed according to the needs, in order to increase the compactness of the structure and reduce the volume of the electromagnetic flowmeter 4000, optionally, the signal wire 9 is a sheet structure, and the signal wire 9 is arranged basically parallel to the side wall of the bracket 1.

Furthermore, in some embodiments, the support 1 is square, and the signal wires 9 are arranged along the symmetry axis of the side wall of the support 1, so as to ensure that the arrangement direction of the signal wires 9 intersects the axes of the two spiral coils 51 as much as possible, so as to eliminate the influence of differential interference on the signal as much as possible.

With reference to fig. 9 to 11, the signal line 9 of the present embodiment may be disposed on one side of the third sidewall or the fourth sidewall, so as to ensure that the arrangement direction of the signal line 9 intersects with the axes of the two spiral coils 51 as much as possible. Optionally, the middle of the signal wire 9 is substantially parallel to the surface of the third sidewall or the fourth sidewall, so as to ensure that the signal wire 9 is perpendicular to the axis of the spiral coil 51, thereby eliminating the influence of differential interference on the signal as much as possible and improving the measurement accuracy of the electromagnetic flowmeter 4000. It is to be understood that the middle of the signal line 9 is substantially parallel to the surface of the third sidewall or the fourth sidewall means that the middle of the signal line 9 is completely parallel to the surface of the third sidewall or the fourth sidewall, or the middle of the signal line 9 is substantially parallel to the surface of the third sidewall or the fourth sidewall.

In some embodiments, there is a space between the signal line 9 and the third sidewall or the fourth sidewall, and the distance between the signal line 9 and the coil assembly 5 in the third sidewall or the fourth sidewall is increased, so that interference of the signal line 9 on an electromagnetic field when transmitting a signal is reduced. Further, a spacer is provided between the coil fixing plate 52 and the signal line 9, and the spacer is used to keep a space between the signal line 9 and the coil fixing plate 52, so as to ensure that the space between the signal line 9 and the coil assembly 5 in the third side wall or the fourth side wall is stable. The spacer may be made of a hard material or a flexible material. Alternatively, the spacer is made of a deformable material, preventing the signal line 9 from being worn, and extending the service life of the signal line 9. The spacing piece can be a foam piece or a rubber piece, and can also be other flexible pieces.

The implementation manner of connecting the signal line 9 and the two signal acquisition boards 4 can be selected as required, for example, in some embodiments, two ends of the signal line 9 are detachably connected to the corresponding signal acquisition boards 4 through electrical connectors, respectively, to implement the electrical coupling connection of the two signal acquisition boards 4.

In other embodiments, one end of the signal line 9 is integrally formed with one of the signal collecting boards 4, and the other end of the signal line 9 is provided with an electrical connector for detachable connection with the electrical connector of the other signal collecting board 4, so that the signal line 9 is not easy to lose, and such a design does not cause trouble to the installation of the signal collecting board 4 and reduces the weight of the electromagnetic flowmeter 4000. It can be understood that the electrical connector of the signal line 9 and the electrical connector of the signal acquisition board 4 are a male connector and a female connector which are matched with each other, and the male connector and the female connector can be matched to realize the electrical coupling connection of the signal line 9 and the signal acquisition board 4.

Further alternatively, both ends of the signal line 9 are connected to the center positions of the sides of the two signal collecting boards 4, respectively, so as to ensure that the axes of the two spiral coils 51 pass through the signal line 9.

The signal line 9 of this embodiment can be the FPC line, and the FPC line is conveniently buckled to can connect the signal acquisition board 4 of relative setting in support 1 both sides more conveniently. It is understood that the signal line 9 may be other types of conductive lines.

It is to be understood that the layout manners of the signal lines 9 in the above embodiments may be combined with each other.

In addition, in an alternative embodiment, the two signal acquisition boards 4 are overlapped through the signal transmission circuit board to realize signal transmission, and the two signal acquisition boards 4 and the signal transmission board form a structure similar to a shape like a Chinese character 'men', so that the influence of differential interference on signals is eliminated, and the measurement accuracy of the electromagnetic flowmeter 4000 is improved.

It is worth mentioning that the electromagnetic flow meter 4000 of the above embodiment can be applied to a plant protection unmanned aerial vehicle or other devices with a liquid channel.

Referring to fig. 16, an embodiment of the present invention further provides a plant protection unmanned aerial vehicle, where the plant protection unmanned aerial vehicle may include a rack 1000, a spraying assembly 2000 installed on the rack 1000, a medicine box 3000 installed on the rack 1000, and the electromagnetic flowmeter 4000 for spraying flow rate according to the above embodiment, where the electromagnetic flowmeter 4000 is used to detect the spraying assembly 2000 in real time, and the structure and the working principle of the electromagnetic flowmeter 4000 may refer to the description of the above embodiment, and are not described herein again.

In the present embodiment, one of the open ends of the pipe 2 of the electromagnetic flow meter 4000 communicates with the spraying assembly 2000 through the flow guide pipe, and the other open end of the pipe 2 communicates with the medicine box 3000 through the flow guide pipe. Specifically, one of the open ends of the pipeline 2 is connected to the flow guide pipe through a first pipeline connector 100 and communicated with the spraying assembly 2000, and the other open end of the pipeline 2 is connected to the flow guide pipe through a second pipeline connector 200 and communicated with the medicine box 3000.

The electromagnetic flowmeter 4000 of this embodiment is small, light in weight, uses this electromagnetic flowmeter 4000 on plant protection unmanned aerial vehicle, can not influence the installation of other structures of plant protection unmanned aerial vehicle to can not bring great heavy burden for plant protection unmanned aerial vehicle, improved plant protection unmanned aerial vehicle's duration.

The rack 1000 may include a body 1100 and a foot rest 1200 attached to both sides of the bottom of the body 1100. Further, the rack 1000 may further include a horn 1300 coupled to both sides of the body 1100. The spray assembly 2000 of this embodiment includes at least a spray head, and optionally, the spray assembly 2000 is mounted on an end of the horn 1300 remote from the body 1100. Optionally, plant protection unmanned aerial vehicle is many rotor unmanned aerial vehicle, including the screw, the screw is located horn 1300 and is kept away from the one end of fuselage 1100, sprays subassembly 2000 and is located the screw below. Optionally, the medicine box 3000 is mounted at the bottom of the fuselage 1100 and between the two foot rests 1200. Optionally, the electromagnetic flow meter 4000 is provided at the outlet of the medicine box 3000.

In this embodiment, after the control board 6 acquires the spraying flow rate of the spraying assembly 2000, the spraying flow rate is sent to the flight controller of the plant protection unmanned aerial vehicle, and the water yield of the pesticide box 3000 is controlled by the flight controller according to the spraying flow rate sent by the control board 6 and the spraying flow rate of the actual demand.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The electromagnetic flow meter and the plant protection unmanned aerial vehicle with the electromagnetic flow meter provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims

1. An electromagnetic flow meter, comprising:

a housing having a receiving space;

a bracket installed in the accommodating space;

2. An electromagnetic flowmeter as set forth in claim 1 wherein said housing comprises a case having an opening in one side thereof and a cover plate for covering said opening and being in electrically conductive contact with said case, one of said open ends of said pipe extending from a side wall of said case opposite said opening and the other open end of said pipe extending from said cover plate;

one of the signal acquisition boards is arranged adjacent to the cover board, the grounding jack is arranged on the signal acquisition board which is arranged adjacent to the cover board, and the grounding connecting piece penetrates through the grounding jack and is fixed on the cover board, so that the cover board and the shell are grounded.

3. The electromagnetic flowmeter of claim 2, further comprising a control board electrically coupled to each of the two signal acquisition boards, the control board being configured to obtain a flow rate and/or a velocity of the liquid flowing through the pipeline based on the signals acquired by the two signal acquisition boards;

the control panel and one of the signal acquisition boards are integrated on the same circuit board.

4. The electromagnetic flowmeter of claim 2 or 3, wherein the side wall of the cover plate facing the opening is provided with a grounding projection, and the grounding connector passes through the grounding jack and is detachably connected with the grounding projection.

5. An electromagnetic flow meter according to claim 2, wherein the junction of the housing and the cover plate is provided with a first seal for preventing water from flowing into the housing from a gap between the open periphery of the housing and the cover plate.

6. The electromagnetic flowmeter of claim 2, further comprising a first conduit connector and a second conduit connector, wherein the first conduit connector is in communication with an open end of the conduit extending out of the cover plate, and the second conduit connector is in communication with an open end of the conduit extending out of the housing;

and, first pipe connection head with apron fixed connection, second pipe connection head with casing fixed connection.

7. The electromagnetic flowmeter of claim 6 wherein the cover plate is provided with a first mounting boss having a second through-hole communicating with the open end of the conduit;

the first pipeline connector is sleeved on the first mounting boss.

8. The electromagnetic flowmeter of claim 7, wherein the inner sidewall of the first pipe joint is provided with a third step portion, and the third step portion abuts against the end face of the top end of the first mounting boss.

9. The electromagnetic flow meter according to claim 8, wherein a second sealing member is provided between the third step portion and an end surface of the first mounting boss remote from the open end of the pipe, for preventing water in the pipe from flowing into the housing from a gap between the first pipe joint and the first mounting boss.

10. The electromagnetic flowmeter of claim 6 wherein the cover plate defines a plurality of first mounting holes, the first pipe joint including a first mounting portion;

the first installation part is fixedly connected with the first installation holes through threaded fasteners.

11. The electromagnetic flow meter according to claim 6 or 7, wherein a second mounting boss is provided on the case, the second mounting boss being provided with a third through hole;

the second pipeline connector is sleeved on the second mounting boss.

12. An electromagnetic flow meter according to claim 11, wherein a second seal ring is provided between the inner side wall of the second pipe connector and the outer side wall of the second mounting boss for preventing water from flowing into the housing from the outside of the housing through a gap between the first pipe connector and the second mounting boss.

13. The electromagnetic flow meter according to claim 11, wherein the second pipe joint has a fourth step portion on an inner side wall thereof, and the fourth step portion abuts against an end surface of a tip end of the second mounting boss.

14. An electromagnetic flow meter according to claim 13, wherein a third seal is provided between the fourth step and the top end of the second mounting boss for preventing water in the pipe from flowing into the housing from a gap between the second pipe joint and the second mounting boss.

15. An electromagnetic flow meter according to claim 6 or 10, wherein the housing is provided with a plurality of second mounting holes, the second pipe joint comprising a second mounting portion;

the second installation part is fixedly connected with the plurality of second installation holes through threaded fasteners.

16. The electromagnetic flowmeter of claim 6 wherein the first and second conduit connectors are stainless steel;

the first pipeline connector and the second pipeline connector are respectively passivated at the contact part of the cover plate and the shell.

17. The electromagnetic flowmeter of claim 1 wherein the ground connection is a threaded fastener.

18. An electromagnetic flowmeter as set forth in claim 1 wherein said support comprises first and second oppositely disposed sidewalls, one of said electrodes being disposed on one side of said first sidewall and the other of said electrodes being disposed on one side of said second sidewall;

the first side wall and the second side wall are respectively provided with an electrode mounting hole, and the position of the pipeline side wall corresponding to the electrode mounting hole is provided with a through hole;

the detection end of one electrode is at least partially exposed in the pipeline after passing through the electrode mounting hole of the first side wall and the corresponding through hole, and the detection end of the other electrode is at least partially exposed in the pipeline after passing through the electrode mounting hole of the second side wall and the corresponding through hole.

19. The utility model provides a plant protection unmanned aerial vehicle, its characterized in that, plant protection unmanned aerial vehicle includes:

a frame;

the spraying assembly is arranged on the rack;

a medicine box mounted on the frame; and

20. The unmanned aerial vehicle for plant protection of claim 19, wherein the housing comprises a housing and a cover plate, the housing has an opening on one side, the cover plate is used for covering the opening and is in conductive contact with the housing, one of the open ends of the pipe extends from a side wall of the housing opposite to the opening, and the other open end of the pipe extends from the cover plate;

21. The unmanned aerial vehicle for plant protection as claimed in claim 20, wherein the electromagnetic flow meter further comprises a control board, the control board is electrically coupled to the two signal collecting boards, and the control board is configured to obtain a flow rate and/or a velocity of the liquid flowing through the pipeline according to the signals collected by the two signal collecting boards;

the control panel and the signal acquisition board on the same side are integrally arranged on the same circuit board.

22. The unmanned aerial vehicle for plant protection as claimed in claim 20 or 21, wherein the cover plate is provided with a grounding protrusion on a side wall facing the opening, and the grounding connector passes through the grounding jack and then is detachably connected to the grounding protrusion.

23. A plant unmanned aerial vehicle as claimed in claim 20, wherein the junction of the housing and the cover plate is provided with a first seal for preventing water from flowing into the housing from a gap between the open periphery of the housing and the cover plate.

24. The plant protection unmanned aerial vehicle of claim 20, wherein the electromagnetic flow meter further comprises a first pipe connector and a second pipe connector, the first pipe connector is communicated with an opening end of the pipe extending out of the cover plate, and the second pipe connector is communicated with an opening end of the pipe extending out of the housing;

25. The plant protection unmanned aerial vehicle of claim 24, wherein the cover plate is provided with a first mounting boss, the first mounting boss is provided with a second through hole, and the second through hole is communicated with the opening end of the pipeline;

the first pipeline connector is sleeved on the first mounting boss.

26. The unmanned aerial vehicle for plant protection of claim 25, wherein the inner side wall of the first pipe connector is provided with a third step portion, and the third step portion abuts against the end face of the top end of the first mounting boss.

27. The unmanned aerial vehicle for plant protection of claim 26, wherein a second sealing member is disposed between the third step portion and an end surface of the first mounting boss away from the open end of the pipe for preventing water in the pipe from flowing into the housing from a gap between the first pipe connector and the first mounting boss.

28. The plant protection unmanned aerial vehicle of claim 24, wherein the cover plate is provided with a plurality of first mounting holes, and the first pipe connector comprises a first mounting portion;

29. A plant protection unmanned aerial vehicle according to claim 24 or 25, wherein the housing is provided with a second mounting boss provided with a third through hole;

the second pipeline connector is sleeved on the second mounting boss.

30. The plant protection unmanned aerial vehicle of claim 29, wherein a second seal ring is disposed between an inner side wall of the second pipe connector and an outer side wall of the second mounting boss, and is used for preventing water from flowing into the housing from the outside of the housing through a gap between the first pipe connector and the second mounting boss.

31. The unmanned aerial vehicle for plant protection of claim 29, wherein the inner side wall of the second pipe connector is provided with a fourth step portion, and the fourth step portion abuts against the end face of the top end of the second mounting boss.

32. The unmanned aerial vehicle for plant protection of claim 31, wherein a third seal is disposed between the fourth step and the top end of the second mounting boss for preventing water in the pipe from flowing into the housing from a gap between the second pipe connector and the second mounting boss.

33. A plant protection unmanned aerial vehicle as claimed in claim 24 or 28, wherein the housing is provided with a plurality of second mounting holes, and the second pipe connector comprises a second mounting portion;

34. The plant protection unmanned aerial vehicle of claim 24, wherein the first and second pipe connectors are stainless steel;

35. The plant protection drone of claim 19, wherein the ground connection is a threaded fastener.

36. The unmanned aerial vehicle for plant protection of claim 19, wherein the frame comprises a first sidewall and a second sidewall disposed opposite to each other, one of the electrodes being disposed on one side of the first sidewall and the other electrode being disposed on one side of the second sidewall;