CN112154307A

CN112154307A - Electromagnetic flowmeter, sprinkler and movable platform

Info

Publication number: CN112154307A
Application number: CN201980033834.3A
Authority: CN
Inventors: 舒展; 周乐; 周万仁
Original assignee: SZ DJI Technology Co Ltd
Current assignee: SZ DJI Technology Co Ltd
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2020-12-29
Also published as: WO2021087705A1

Abstract

An electromagnetic flowmeter (40), a spraying device (200) and a movable platform (100), wherein a shell (41) of the electromagnetic flowmeter (40) is a conductive shell made of a first non-metal material, the shell (41) is grounded, and a detection electrode assembly (44) and a signal acquisition assembly (45) are arranged in the shell (41) so that the shell (41) can electromagnetically shield the detection electrode assembly (44) and the signal acquisition assembly (45).

Description

Electromagnetic flowmeter, sprinkler and movable platform

Technical Field

The application relates to the technical field of flow detection, in particular to an electromagnetic flowmeter, a spraying device and a movable platform.

Background

In order to spray flow and calculate the sprayed amount for the convenience of control, plant protection unmanned aerial vehicle's sprinkler includes water tank, electromagnetic flow meter and water pump usually, and the electromagnetic flow meter is connected between water tank and water pump for measure the flow of the liquid medicine of flowing through the water pump by the water tank. However, in order to realize functions such as ground connection and electromagnetic shield, the casing of current electromagnetic flowmeter generally all is metal material, and this weight and the cost greatly increased that has led to the electromagnetic flowmeter is unfavorable for using equipment such as plant protection unmanned aerial vehicle that is comparatively sensitive to the weight.

Disclosure of Invention

Based on this, the present application provides an electromagnetic flow meter, a sprinkler, and a movable platform, aiming to reduce the weight of the electromagnetic flow meter and to reduce the cost of the electromagnetic flow meter.

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

a housing;

the main body bracket at least partially penetrates through the shell and is connected with the shell;

a catheter arranged on the main body bracket;

a detection electrode assembly partially penetrating the liquid guide pipe to contact the liquid flowing through each liquid guide pipe;

the signal acquisition assembly is arranged on the main body bracket, is electrically connected with the detection electrode assembly and is used for acquiring signals of the detection electrode assembly;

the coil assembly is arranged on the main body bracket and used for generating an electromagnetic field;

the shell is a conductive shell made of a first non-metal material, the shell is grounded, and the detection electrode assembly and the signal acquisition assembly are arranged in the shell, so that the shell can electromagnetically shield the detection electrode assembly and the signal acquisition assembly.

According to a second aspect of the present application, there is provided a spraying device comprising:

a liquid supply tank;

the water pump is used for pumping liquid from the liquid supply tank;

the spray head is communicated with the water pump, and the water pump conveys liquid to the spray head and sprays the liquid out through the spray head;

the electromagnetic flowmeter is communicated between the liquid supply tank and the water pump and is used for detecting the flow and/or the speed of liquid flowing into the water pump from the liquid supply tank.

According to a third aspect of the present application, there is provided a movable platform comprising:

a movable body;

the spraying device is arranged on the movable main body.

The embodiment of the application provides an electromagnetic flowmeter, sprinkler and movable platform, because shell ground connection, detection electrode subassembly with signal acquisition board subassembly is all located in the shell, therefore the shell can be to detection electrode subassembly with signal acquisition board subassembly plays electromagnetic shield's effect, under the condition that does not increase extra electromagnetic shield cover, can avoid detection electrode subassembly through shell ground connection with signal acquisition board subassembly etc. receive the interference of external signal, shell ground connection realizes that electromagnetic shield's mode can not increase electromagnetic flowmeter's volume and weight, has also saved the cost of setting up extra electromagnetic shield cover simultaneously. In addition, the shell is a conductive shell made of the first non-metal material, the shell can be grounded to achieve electromagnetic shielding without using a metal shell, the density of the non-metal material is generally lower than that of the metal material, and the price of the non-metal material is generally lower than that of the metal material, so that the weight of the electromagnetic flowmeter can be greatly reduced and the cost of the electromagnetic flowmeter can be reduced by using the shell made of the non-metal material with conductivity.

Drawings

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

FIG. 1 is a schematic illustration of a movable platform provided by an embodiment of the present application;

FIG. 2 is an angular schematic view of a flow meter according to an embodiment of the present application;

FIG. 3 is a schematic view of another angle configuration of a flow meter according to an embodiment of the present application;

FIG. 4 is an exploded schematic view of a flow meter provided by an embodiment of the present application;

FIG. 5 is a schematic cross-sectional view of an angle of a flow meter provided by an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view of an angle of a flow meter provided by an embodiment of the present application;

FIG. 7 is a schematic cross-sectional view of an angle of a flow meter provided by an embodiment of the present application;

FIG. 8 is a schematic cross-sectional view of an angle of a flow meter provided by an embodiment of the present application;

FIG. 9 is a schematic view of a housing provided by an embodiment of the present application;

FIG. 10 is a schematic diagram of a portion of a flow meter provided in accordance with an embodiment of the present application, showing a signal acquisition assembly and a control board;

FIG. 11 is a partial schematic structural view of a flow meter provided by an embodiment of the present application showing a body support, a catheter and a second adapter;

FIG. 12 is an angular view of the housing according to an embodiment of the present application;

FIG. 13 is a schematic view of an alternative angle configuration of the housing provided by an embodiment of the present application;

fig. 14 is a schematic partial structural view of a flow meter provided in an embodiment of the present application, showing a first joint.

Description of reference numerals:

1000. a movable platform; 100. a movable body; 200. a spraying device; 10. a liquid supply tank; 20. a water pump; 30. a spray head; 40. an electromagnetic flow meter;

41. a housing; 411. a housing; 412. a conductive layer; 413. a base plate; 4131. a through hole; 414. a sidewall portion; 415. an accommodating chamber; 4151. an opening;

42. a main body support; 421. an end surface portion; 422. a flow guide cone; 43. a catheter; 44. a detection electrode assembly; 441. a detection electrode;

45. a signal acquisition component; 451. a signal acquisition board; 4511. an electrical mating portion; 452. an electrical connection; 46. a coil assembly; 461. a coil; 462. an iron core; 463. a fixed mount; 47. a control panel; 471. an electrical connection portion;

481. a buffer member; 482. a first joint; 4821. a liquid inlet; 483. a second joint; 484. a first ground electrode; 485. a second ground electrode; 486. a cavity; 491. a first seal member; 492. a second seal member; 493. a third seal member; 494. an electric plug.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. 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 application.

It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

The inventor of this application discovers, plant protection unmanned aerial vehicle's sprinkler include water tank, electromagnetic flowmeter, water pump usually and with the shower nozzle of water pump intercommunication, the water pump extracts liquid and carries liquid to the shower nozzle in from the water tank, spray out the casing that the shell that is used for electromagnetic flowmeter adopted metal material to make usually through the shower nozzle with liquid, from this greatly increased the weight and the cost of flowmeter, be unfavorable for using to equipment such as unmanned aerial vehicle on duty comparatively sensitive to the weight.

In view of this finding, the inventors of the present application have made improvements to the electromagnetic flow meter to effectively reduce the weight and cost of the electromagnetic flow meter. Specifically, the present application provides an electromagnetic flow meter comprising: a housing; the main body bracket at least partially penetrates through the shell and is connected with the shell; a catheter arranged on the main body bracket; a detection electrode assembly partially penetrating the liquid guide pipe to contact the liquid flowing through each liquid guide pipe; the signal acquisition board assembly is arranged on the main body bracket, is electrically connected with the detection electrode assembly and is used for acquiring signals of the detection electrode assembly; the coil assembly is arranged on the main body bracket and used for generating an electromagnetic field; the shell is a conductive shell made of a first non-metal material, the shell is grounded, and the detection electrode assembly and the signal acquisition board assembly are arranged in the shell, so that the shell can electromagnetically shield the detection electrode assembly and the signal acquisition board assembly.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 1, an embodiment of the present application provides a movable platform 1000 including a movable body 100 and a spraying device 200, wherein the spraying device 200 is mounted on the movable body 100. The movable platform 1000 is used for spraying agricultural products, forest trees and the like with liquid such as pesticide, water and the like in the farming industry. The movable body 100 can move, rotate, turn, and the like, and the movable body 100 can drive the spraying device 200 to move to different positions or different angles to perform spraying operation in a preset area. The movable platform 1000 may include an agricultural spray truck, an agricultural drone, or a human powered spray device, etc.; or the movable platform 1000 in one form is one of an agricultural spray vehicle, an agricultural drone or a human spray device, and in another form is another of an agricultural spray vehicle, an agricultural drone or a human spray device.

The following description will be given by taking an example in which the movable platform 1000 is an agricultural unmanned aerial vehicle and the spraying liquid is a liquid medicine. It is to be understood that the particular form of the movable platform 1000 is not limited to agricultural drones and is not intended to be limiting herein.

Referring to fig. 1, in some embodiments, a spraying device 200 includes a liquid supply tank 10, a water pump 20, a spray head 30, and an electromagnetic flow meter 40.

The liquid supply tank 10 contains therein a liquid to be sprayed. The water pump 20 is used to pump liquid from the liquid supply tank 10. The nozzle 30 is connected to the water pump 20, and the water pump 20 supplies the liquid to the nozzle 30 and sprays the liquid through the nozzle 30, thereby performing a spraying operation. The electromagnetic flowmeter 40 is connected between the liquid supply tank 10 and the water pump 20. When the water pump 20 pumps the liquid from the liquid supply tank 10, the liquid in the liquid supply tank 10 flows to the water pump 20 through the electromagnetic flow meter 40, and at this time, the electromagnetic flow meter 40 can detect the flow rate and/or speed of the liquid flowing from the liquid supply tank 10 into the water pump 20.

It will be appreciated that the number of water pumps 20 may be designed according to the actual requirements, for example one, two, three or more. In some embodiments, where the number of water pumps 20 is multiple, such as two, three, four, or more, the electromagnetic flow meter 40 can detect the flow rate and/or velocity of the liquid flowing from the supply tank 10 into each water pump 20. The water pumps 20 can work simultaneously; one or more of the water pumps 20 can be selected to operate according to actual requirements, and the rest of the water pumps 20 do not operate.

Referring to fig. 4 to 8, the electromagnetic flowmeter 40 includes a housing 41, a main body frame 42, a catheter 43, a detection electrode assembly 44, a signal acquisition assembly 45, and a coil assembly 46.

Referring to fig. 4-8, in some embodiments, the body support 42 is coupled to the housing 41. At least a portion of the body support 42 extends through the housing 41. The catheter 43 is provided on the main body frame 42. The detection electrode assembly 44 is partially inserted through the liquid guide tube 43 to contact the liquid flowing through the inside of each liquid guide tube 43. The signal acquisition assembly 45 and the coil assembly 46 are both disposed on the main body support 42. The signal collecting assembly 45 is electrically connected with the detection electrode assembly 44 and is used for collecting signals of the detection electrode assembly 44. The coil assembly 46 is used to generate an electromagnetic field.

Wherein, the casing 41 is a conductive shell 411 made of a first non-metallic material, the casing 41 is grounded, and the detection electrode assembly 44 and the signal acquisition assembly 45 are both arranged in the casing 41, so that the casing 41 can electromagnetically shield the detection electrode assembly 44 and the signal acquisition assembly 45.

In the electromagnetic flowmeter 40 provided in the above embodiment, since the case 41 is grounded, and the detection electrode assembly 44 and the signal acquisition assembly 45 are both disposed in the case 41, the case 41 can perform an electromagnetic shielding function on the detection electrode assembly 44 and the signal acquisition assembly 45, and under the condition that no additional electromagnetic shielding cover is added, the interference that the detection electrode assembly 44 and the signal acquisition assembly 45 and the like receive external signals can be avoided by grounding the case 41, and the electromagnetic shielding mode achieved by grounding the case 41 does not increase the volume and weight of the electromagnetic flowmeter 40, and meanwhile, the cost for disposing the additional electromagnetic shielding cover is also saved. In addition, the housing 41 is the conductive housing 411 made of the first non-metallic material, and the housing 41 can be grounded to achieve electromagnetic shielding without using the metal housing 41, the density of the non-metallic material is generally lower than that of the metal material, and the price of the non-metallic material is generally lower than that of the metal material, so that the housing 41 made of the non-metallic material with conductivity can greatly reduce the weight of the electromagnetic flowmeter 40 and the cost of the electromagnetic flowmeter 40.

In some embodiments, the first non-metallic material comprises at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other materials that are electrically conductive and relatively light in weight. The conductive plastic is thermoplastic plastic material doped with metal particles and/or conductive nano particles. In some embodiments, the housing 41 is formed by mixing plastic and conductive filler material. It will be appreciated that the conductive filler material is highly conductive and needs to be present in sufficient quantity to enable contact between the particles of filler material to thereby enable the shell 41 to conduct electricity. Wherein the plastic comprises at least one of polyethylene, polypropylene, polyvinyl chloride, polybutylene, polystyrene, and the like. The conductive filling material comprises at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber, graphite fiber and the like.

Referring to fig. 9, in some embodiments, the housing 41 includes a shell 411 and a conductive layer 412. The housing 411 is made of a non-conductive plastic, i.e., the housing 411 is made of any plastic that does not have electrical conductivity. The conductive layer 412 is provided on the outer surface of the housing 411. Illustratively, a conductive paint or an electroless metal layer is sprayed on the housing 411, so that all or part of the surface of the housing 411 can be conductive, and the housing 411 can be grounded to achieve electromagnetic shielding.

In some embodiments, body support 42 is a frame made of plastic to further reduce the weight of electromagnetic flow meter 40 and to reduce the cost of electromagnetic flow meter 40. Of course, the material of the body bracket 42 is not limited to plastic, and other lighter materials may be selected as desired.

In some embodiments, the catheter 43 is made of a second non-metallic material to further reduce the weight of the electromagnetic flow meter 40 and to reduce the cost of the electromagnetic flow meter 40. The second non-metal material may be an insulating plastic, or any other material that is light and has no electrical conductivity. Insulating plastic refers to non-conductive plastic, i.e., plastic that does not have electrical conductivity. The insulating plastic includes at least one of Liquid Crystal Polymer (LCP), Polyphthalamide (PPA), or other non-conductive plastic.

In some embodiments, the catheter 43 is integrally formed with the body mount 42 to reduce assembly steps and improve manufacturing efficiency of the electromagnetic flow meter 40. In other embodiments, the catheter 43 and the main body frame 42 may be provided separately.

Referring to fig. 6 to 8 again, in some embodiments, the detection electrode assembly 44 includes two detection electrodes 441, and the two detection electrodes 441 are respectively disposed through two opposite sides of the liquid guiding tube 43. Specifically, the detection ends of both detection electrodes 441 are capable of contacting the liquid flowing through the liquid guide tube 43, and the detection ends of both detection electrodes 441 are disposed opposite to each other. In order to enable the two detection electrodes 441 to better generate induced electromotive force, the two detection electrodes 441 are coaxially disposed, i.e., the detection ends of the two detection electrodes 441 are opposite to each other.

In some embodiments, the detecting electrode 441 is made of a third non-metallic material with conductivity, and the electromagnetic flow meter 40 can detect the flow rate and/or velocity of the liquid in the liquid guide tube 43 without using a metal electrode, thereby further effectively reducing the weight of the electromagnetic flow meter 40 and the cost of the electromagnetic flow meter 40. The third non-metallic material includes at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other materials that are electrically conductive and relatively light in weight. Illustratively, the sensing electrode 441 is formed using a mixture of plastic and conductive filler material. It will be appreciated that the conductive filler material has a high conductivity and needs to be present in sufficient quantity to enable contact between the particles between the filler material to enable the detection electrode 441 to be conductive. Wherein the plastic comprises at least one of polyethylene, polypropylene, polyvinyl chloride, polybutylene, polystyrene, and the like. The conductive filling material comprises at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber, graphite fiber and the like.

It is understood that when the housing 41 and the detection electrode 441 are both formed by mixing plastic and conductive filling material, the third non-metallic material may be the same as or different from the first non-metallic material, and is not limited herein.

In some embodiments, the detecting electrode 441 has a multi-segment cylindrical structure, and the detecting electrode 441 is in clearance fit with the catheter 43, so as to facilitate the assembly and disassembly of the detecting electrode 441. In order to improve the sealing performance between the detection electrode 441 and the catheter 43, a radial sealing ring is further arranged between the detection electrode 441 and the catheter 43, compared with end face sealing, the end face of the detection electrode 441 of the embodiment of the present application can ensure the sealing effect between the detection electrode 441 and the catheter 43 without too much pressing force, and prevent liquid in the catheter 43 from flowing from a gap between the detection electrode 441 and the catheter 43 to a gap between the catheter 43 and the housing 41, thereby preventing the signal acquisition assembly 45 or other components from being damaged due to water.

In some embodiments, detection electrode 441 is in intimate contact with signal acquisition assembly 45, and a conductive copper layer is disposed around the electrode hole of signal acquisition assembly 45 to facilitate electrical connection of signal acquisition assembly 45 to detection electrode 441. The signal collection member 45 and the detection electrode 441 may be additionally soldered, thereby improving contact reliability between the signal collection member 45 and the detection electrode 441. In order to improve solderability of the detection electrode 441, the surface of the detection electrode 441 may be plated with tin.

Referring again to fig. 6-8, in some embodiments, the signal acquisition assembly 45 includes two signal acquisition boards 451, and the two signal acquisition boards 451 are electrically connected. The two signal collecting plates 451 are disposed on the same side of the main body frame 42 corresponding to the two detection electrodes 441, and the two signal collecting plates 451 are used for collecting signals of the detection electrodes 441 on the corresponding side. The signal of the detection electrode 441 on the corresponding side is collected by the signal collecting plate 451 on each side, so that signal interference can be reduced.

Referring again to fig. 4 to 6, in some embodiments, the coil assembly 46 includes a coil 461, a core 462 and a fixing frame 463, wherein the coil 461 is wound on the core 462. The iron core 462 is disposed on the fixing frame 463 for restricting the magnetic field direction and reducing the magnetic flux leakage. The fixing frame 463 is attached to the main body frame 42 or the catheter 43. Any suitable connection between the fixing frame 463 and the main body frame 42 or between the fixing frame 463 and the catheter 43 may be used, as desired, for example, by integral molding, or by detachable connection via screws, bolts, snaps, etc. Alternatively, the axial direction of the detection electrode 441 is perpendicular to the axial direction of the coil assembly 46, that is, the axial direction of the detection electrode 441 is perpendicular to the length extension direction of the iron core 462, so that the detection electrode 441 better generates induced electromotive force.

The number of coil assemblies 46 can be set according to practical requirements, for example, one, two or more coil assemblies can be designed, as long as the magnetic field can be generated to generate the induced electromotive force for detection in the catheter 43. When the number of the liquid guide pipes 43 is multiple and the number of the coil assemblies 46 is multiple, the multiple coil assemblies 46 are symmetrically distributed in the middle of each liquid guide pipe 43, so that the magnetic field intensity at the target position in each liquid guide pipe 43 is basically consistent, and the flow detection precision is ensured. The target location is the location in each of the catheters 43 where the sensing end or measuring plane of the electrode assembly 44 is located.

Referring to fig. 4 to 6 again, the number of the liquid guiding tubes 43 is four, and the

liquid guiding tubes

43a, 43b, 43c, and 43d are arranged in parallel, and the liquid flowing direction is from top to bottom. The two detection electrodes 441 are disposed in the front-rear direction. The number of the coil assemblies 46 is two, and the coil assemblies are symmetrically arranged in the middle of the four liquid guide pipes 43, namely between the

liquid guide pipes

43a and 43b and between the

liquid guide pipes

43c and 43d, and the magnetic field direction is in the left-right direction and is perpendicular to the liquid flow. The ions of the liquid flowing through the liquid guide tube 43 are deflected by the electromagnetic field to generate an electromotive force in the front-rear direction, and the magnitude of the electromotive force can be detected by the detection electrode assembly 44. This electromagnetic flowmeter 40 adopts electromagnetic induction's detection principle, and the electromagnetic field, catheter 43 and two detection electrode 441 arrange the three and be the orthogonal distribution, and electromotive force and magnetic field intensity are all in direct proportion with water velocity, thereby the size of the backward thrust rivers flow through detection electrode 441 detection voltage.

It should be noted that the number of the detection electrode assemblies 44 is the same as that of the liquid guide tubes 43, and each liquid guide tube 43 is provided with the detection electrode assembly 44. The number of coil assemblies 46 may be the same as or different from that of the catheters 43, and is not limited herein. Alternatively, when the number of the coil assemblies 46 is plural, the plural coil assemblies 46 are coaxially arranged so that the detection electrode 441 better generates induced electromotive force.

Referring to fig. 4, 6-8, in some embodiments, electromagnetic flowmeter 40 further includes a control board 47. The control board 47 is electrically connected to the signal acquisition assembly 45 for acquiring the flow rate and/or velocity of the liquid flowing through the liquid guide tube 43 according to the signal acquired by the signal acquisition assembly 45. The control board 47 is disposed opposite to the coil block 46 on both sides of the main body support 42. The control board 47 is electrically connected to one of the signal collecting boards 451.

The number of the liquid guide tubes 43 can be set according to actual requirements, for example, one, two, three or more. Referring to fig. 10, in some embodiments, the number of the liquid guiding tubes 43 is at least two. The middle part of control panel 47 is equipped with electric connection 471, is equipped with electric cooperation portion 4511 on one of them signal acquisition board 451, and electric connection portion 471 is connected with electric cooperation portion 4511 electricity to realize control panel 47 and signal acquisition assembly 45's electricity and be connected, with the improvement flow detection precision. Specifically, one of them signal acquisition board 451 sets up adjacent with control panel 47, and electricity cooperation portion 4511 is located on the signal acquisition board 451 that sets up adjacent with control panel 47, makes things convenient for electric connection portion 471 of control panel 47 to connect electricity cooperation portion 4511 to realize signal acquisition subassembly 45 and control panel 47's electricity and be connected.

Referring to fig. 5, for example, the number of the liquid guide tubes 43 is four, the

liquid guide tubes

43a, 43b, 43c, and 43d are arranged in sequence from left to right, the electrical connection part 471 and the electrical matching part 4511 are respectively located in the middle of the control board 47 and one of the signal collecting boards 451, so that the control board 47 and one of the signal collecting boards 451 are electrically connected in the middle of each liquid guide tube 43, thereby ensuring that the lengths of the detection circuits of the

liquid guide tubes

43a and 43b are substantially the same or the difference is not large, and further improving the flow rate detection accuracy.

In some embodiments, the detection circuitry is disposed on the signal acquisition board 451, and the signal is relatively weak. The processing circuits of the power signal and the signal such as operation, amplification and the like are arranged on the control board 47, the signal is relatively strong, the interference of a strong signal to a weak signal is avoided, and therefore the flow detection precision is ensured.

When the movable platform 1000 such as an agricultural unmanned aerial vehicle is in scenes such as an operation process, the signal acquisition assembly 45 in the agricultural unmanned aerial vehicle is easy to vibrate or shake, so that electromagnetic interference is easy to generate, and the flow detection precision of the flow is further reduced. Referring to fig. 5 and 6 again, in order to buffer the vibration of the signal collecting assembly 45 and generate electromagnetic interference, the electromagnetic flowmeter 40 further includes a buffer 481 to ensure the accuracy of flow detection. The buffer 481 is provided between the housing 41 and the signal collecting assembly 45.

In some embodiments, the housing 41 may be grounded by directly contacting the signal acquisition assembly 45, or the housing 41 may be grounded by electrically connecting the housing 41 and the signal acquisition assembly 45 through a ground connector, which is not limited herein. The ground connection may be a screw, bolt, wire or other conductive member, etc.

Of course, the housing 41 may be grounded by directly contacting the control board 47, or the housing 41 may be grounded by electrically connecting the housing 41 and the control board 47 through a ground connector, which is not limited herein.

In some embodiments, the buffer 481 is made of a soft material having conductivity and elasticity. On one hand, the buffer 481 can buffer the vibration of the signal acquisition assembly 45, and reduce or avoid the electromagnetic interference generated by the vibration of the signal acquisition assembly 45. On the other hand, the buffer member 481 has conductivity, and the case 41 can be electrically connected to the signal collecting assembly 45 through the buffer member 481, thereby grounding the case 41 and electromagnetically shielding the detection electrode assembly 44 and the signal collecting assembly 45. The buffer 481 may be made of any flexible material having conductivity and elasticity, such as at least one of a conductive foam or a conductive sponge, as required.

Referring to fig. 6, in some embodiments, the signal collecting assembly 45 further includes an electrical connector 452, and two ends of the electrical connector 452 are electrically connected to the two signal collecting boards 451, respectively. The two signal acquisition boards 451 are electrically connected through an electric connector 452, so as to form a signal detection loop. The electrical connector 452 may include at least one of a flexible flat cable, a flexible circuit board, and a flexible flat cable. In some embodiments, the direction of extension of the electrical connections 452 intersects the axis of the coil assembly 46. Specifically, the extending direction of the electrical connector 452 intersects the length extending direction of the ferrite core 462. The extending direction of the electrical connector 452 is the extending direction of the two electrical connection ends connected to the two signal collecting boards 451.

In some embodiments, because the annular flexible circuit board is difficult to manufacture, an embodiment of the present application uses a flexible circuit board to be bent around, and then two reinforcing plates are glued to form the signal acquisition assembly 45 having the signal acquisition board 451 and the electrical connection member 452, which is easy to manufacture.

In some embodiments, the signal collecting board 451 is a hard circuit board, and the signal collecting board 451 can directly press the detecting electrode 441, the first grounding electrode 484 or the second grounding electrode 485 to perform an electrode pressing function without adding an additional electrode pressing piece and a screw for locking the electrode pressing piece, so that the structure is compact, the material and assembly cost is reduced, and the weight of the electromagnetic flowmeter 40 is reduced. The effect of this design is more pronounced when the number of detection electrodes 441, first ground electrodes 484, and second ground electrodes 485 is greater.

Because the electromagnetic field in the electromagnetic flowmeter 40 is an alternating magnetic field, if the plane formed by the signal detection loop is not parallel to the direction of the magnetic field, the plane can be influenced by the changing magnetic field to generate induced electromotive force to interfere the measurement signal, and the existence of the interference can influence the stability of the flow velocity signal and reduce the detection precision. In order to avoid or reduce the interference, the extending direction of the electrical connector 452 is perpendicular to the length extending direction of the iron core 462, so that the signal detection loop of the signal acquisition assembly 45 is approximately parallel to the magnetic field direction, thereby ensuring the stability of the flow velocity signal and improving the detection accuracy.

Referring to fig. 5, 7 and 8, in some embodiments, the electromagnetic flow meter 40 further includes a first joint 482 and a second joint 483, and the first joint 482 and the second joint 483 are respectively connected to the liquid inlet end and the liquid outlet end of the liquid guide tube 43 and are both mounted on the housing 41. Specifically, the first joint 482 is connected to the inlet end of the liquid guide tube 43 for inflow, and the second joint 483 is connected to the outlet end of the liquid guide tube 43. First joint 482 accessible pipeline is connected with exterior structure such as liquid reserve tank, and exterior structure such as second structure accessible pipeline is connected with water pump 20 to realize being connected of electromagnetic flowmeter 40 and exterior structure.

In some embodiments, the first joint 482, the main body support 42 and the housing 41 are fastened and fixed by fastening members such as screws and nuts, the second joint 483 is integrally formed with the catheter 43, the catheter 43 is integrally formed with the main body support 42, and the second joint 483 is fastened and connected to one end of the housing 41 far away from the first joint 482 and the housing 41 in a snap-fit manner, so that the first pipeline and the second pipeline can be prevented from falling off, and the stability of the electromagnetic flow meter 40 is improved. In other embodiments, the first joint 482 and the second joint 483, and the main body frame 42, the housing 41 or the catheter 43 may be connected by any other suitable connection method, such as integrally molding the first joint 482 and the main body frame 42, locking the main body frame 42 and the housing 41 by a locking member, screwing the second joint 483 and the housing 41, and the like.

In the conventional electromagnetic flow meter 40, the potentials of the liquid flowing through the liquid guide tube 43 at different positions of the liquid guide tube 43 may be different, and the potential references referred to when the two detection electrodes 441 detect may be different, thereby resulting in low detection accuracy. In this regard, in some embodiments, the first and

second connectors

482 and 483 are both electrically conductive and are electrically connected to the housing 41, and the housing 41 is electrically connected to the signal acquisition assembly 45 or the control board 47, such that the first and

second connectors

482 and 483 can be grounded via the housing 41. The grounding of the first joint 482 and the second joint 483 makes the liquid potential in the liquid guide tube 43 zero, and both the detection electrodes 441 detect electromotive force with the zero potential of the liquid as a reference, thereby improving the flow rate detection accuracy. In some embodiments, the first connector 482, the main body bracket 42 and the housing 41 are fastened and electrically connected by an electrically conductive screw or nut, etc. passing through the first connector 482, the main body bracket 42 and the housing 41.

The first and

second contacts

482 and 483 may be made of any suitable conductive material, such as a conductive metal material or a non-metallic conductive material. In some embodiments, the non-metallic, electrically conductive material comprises at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other electrically conductive and lightweight materials to further reduce the weight of electromagnetic flow meter 40 and reduce the cost of electromagnetic flow meter 40.

In some embodiments, first fitting 482 and second fitting 483 are both made of non-conductive plastic to reduce the weight of electromagnetic flow meter 40 and to reduce the cost of electromagnetic flow meter 40. Referring to fig. 4, 5, 7 and 8, in order to improve the flow rate detection accuracy, the electromagnetic flowmeter 40 further includes a first ground electrode 484 and a second ground electrode 485, and the first ground electrode 484 and the second ground electrode 485 can partially penetrate through the liquid guide tube 43 to contact the liquid flowing through the liquid guide tube 43. The first grounding electrode 484 and the second grounding electrode 485 are both electrically connected with the signal acquisition assembly 45 or the control panel 47, so that the liquid potential in the liquid guide tube 43 is zero, and the two detection electrodes 441 both detect electromotive force by using the zero potential of the liquid as a reference, thereby improving the flow detection precision.

In some embodiments, first ground electrode 484 and second ground electrode 485 may be positioned at any suitable location as desired, so long as detection electrode assembly 44 is positioned between first ground electrode 484 and second ground electrode 485. Specifically, the first ground electrode 484, the detection electrode assembly 44, and the second ground electrode 485 are sequentially provided at intervals in the extending direction of the catheter 43. More specifically, a first ground electrode 484 and a second ground electrode 485 are provided at the inlet end and the outlet end of the liquid guide tube 43, respectively.

Referring to fig. 11 in conjunction with fig. 5 and 7, in some embodiments, the first connector 482 has an inlet port 4821, the main body frame 42 has an end surface 421, the first connector 482 and the end surface 421 cooperate to form a cavity 486, and both the inlet port 4821 and the liquid guide tube 43 communicate with the cavity 486. A locking member such as a screw is inserted through the first joint 482, the end surface portion 421 and the housing 41, thereby locking and fixing the first joint 482, the body frame 42 and the housing 41.

Referring to fig. 11 in conjunction with fig. 5, in some embodiments, the number of liquid conduits 43 is at least two, and each liquid conduit 43 is in communication with cavity 486. The electromagnetic flow meter 40 further comprises a flow guide cone 422, the flow guide cone 422 extending along the end surface portion 421 in a direction towards the liquid inlet 4821 of the first joint 482. The guide cone 422 and the first joint 482 are matched to enable the liquid in the liquid inlet 4821 of the first joint 482 to stably move to the detection end or the measurement plane of the detection electrode assembly 44, so that the problems of flow rate reduction, energy loss and pressure drop and vortex generation caused by the fact that the liquid flowing out of the first joint 482 directly impacts the detection end or the measurement plane in the liquid guide pipe 43 are avoided, unstable movement of the fluid along the rotation of an axis and the like is reduced, and the flow measurement accuracy is improved.

In some embodiments, the centerline of the deflector cone 422 is substantially coincident with the centerline of the first joint 482. Specifically, the centerline of the cone 422 is substantially coincident with the centerline of the first joint 482. The flow guiding cone 422 is disposed opposite to the liquid inlet 4821 of the first joint 482, so as to ensure that the flow guiding cone 422 can adjust the flow field and/or the flow direction of the liquid flowing into each liquid guiding tube 43, and prevent the liquid flowing out of the outlet end cavity 486 from directly impacting the detection end or the measurement plane of the electromagnetic flow meter 40, thereby improving the flow measurement accuracy of the electromagnetic flow meter 40. The guiding cone 422 may be integrally formed with the main body bracket 42, or may be separately disposed, which is not limited herein.

In some embodiments, the cross-sectional area of the flow guide portion at the end away from the main body support 42 is smaller than the cross-sectional area at the end adjacent to the main body support 42, so that the liquid flowing through the liquid inlet 4821 of the first joint 482 can be smoothly guided to each liquid guide tube 43.

Referring to fig. 12 and 13, in some embodiments, the housing 41 has a bottom plate 413 and side wall portions 414. The bottom plate 413 has a through hole 4131 for the liquid guide tube 43 to pass through or for the second connector 483 to pass through. The side wall portion 414 is connected to the bottom plate 413 to form a housing chamber 415 communicating with the through hole 4131. The accommodating cavity 415 is used for accommodating at least part of the main body support 42, that is, a part of the main body support 42 is accommodated in the accommodating cavity 415, or the whole main body support 42 is accommodated in the accommodating cavity 415. The receiving cavity 415 has an opening 4151 for the body mount 42 to enter into the receiving cavity 415. The side wall portion 414 is connected to the main body holder 42, thereby fixing the main body holder 42 to the housing 411. The side wall portions 414 and the main body frame 42 may be fixedly connected by any suitable connection means, such as by fastening the main body frame 42 to the side wall portions 414 by fasteners such as screws. The liquid guide pipe 43, the detection electrode assembly 44, the signal acquisition assembly 45, the coil assembly 46 and part of the main body bracket 42 enter the accommodating cavity 415 from the opening 4151, and the liquid guide pipe 43 or the second connector 483 penetrates through the through hole 4131 to be partially exposed outside the shell 41 so as to be convenient for assembly and connection with an external structure.

Referring to fig. 5, 7 and 8, in some embodiments, a first sealing member 491 is disposed between the first joint 482 and the end surface 421 of the body bracket 42, and the first sealing member 491 is used for preventing the liquid in the cavity 486 from leaking out from the gap between the first joint 482 and the end surface 421 of the body bracket 42, thereby improving the sealing performance of the electromagnetic flowmeter 40.

If the sealing property at the joint between the main body support 42 and the casing 41 or between the second connection 483 and the casing 41 is poor, water (mainly moisture in the air) outside the casing 41 easily flows into the casing 41 from the gap between the main body support 42 and the casing 41 or from the gap between the casing 41 and the second connection 483, which may cause the signal collection board 451, the control board 47, and the like in the casing 41 to be short-circuited by water, and may cause other components in the casing 41 to be damaged by water, thereby causing the electromagnetic flow meter 40 to be damaged. For this reason, referring to fig. 5, 7 and 8, a second sealing member 492 is provided between the main body bracket 42 and the housing 41, and the second sealing member 492 serves to prevent water from flowing into the housing 41 from a gap between the main body bracket 42 and the housing 41. The second joint 483 and the housing 41 are provided with a third seal 493, and the third seal 493 serves to prevent water from flowing into the housing 41 from a gap between the second joint 483 and the housing 41.

The first sealing member 491, the second sealing member 492 and the third sealing member 493 may be made of at least one of rubber, silicone, or other sealing materials. The first seal 491, the second seal 492, and the third seal 493 may be made of the same material or different materials, and are not limited thereto.

Referring to fig. 4 and 8, in some embodiments, electromagnetic flow meter 40 further includes an electrical plug 494, wherein electrical plug 494 is configured to be connected to an external power source to electrically operate electromagnetic flow meter 40.

The assembly process of the electromagnetic flow meter 40 will be described below by taking an example in which the liquid guide tube 43 is integrally formed with the main body frame 42, and the second joint 483 is integrally formed with the liquid guide tube 43.

The detection electrode assembly 44 is provided on the catheter 43. The coil assembly 46 is mounted to one side of the body frame 42 by a quick release member. The signal acquisition assembly 45 is mounted on the main body bracket 42 through a quick release member, wherein the liquid guide tube 43 penetrates through the signal acquisition assembly 45, and the liquid guide tube 43 is positioned between the two signal acquisition boards 451. The control plate 47 is mounted to the other opposite side of the main body bracket 42 through a quick release. The main body mount 42 having the catheter 43, the detection electrode assembly 44, the coil assembly 46, the signal acquisition assembly 45 and the control board 47 is attached to the housing 41 by quick release members. The end surface portion 421 is fastened and fixed to the case 41 by a quick release member penetrating the first joint 482 and the end surface portion 421 of the body bracket 42, thereby completing the assembly of the electromagnetic flowmeter 40. The quick release member may be a screw, or other quick release members, which is not limited herein.

While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. An electromagnetic flow meter, comprising:

a housing;

a catheter arranged on the main body bracket;

2. The electromagnetic flow meter according to claim 1, further comprising:

the first joint and the second joint are respectively communicated with the liquid inlet end and the liquid outlet end of the liquid guide pipe and are arranged on the shell.

3. The electromagnetic flow meter of claim 2, wherein the first and second terminals are each electrically conductive and are each electrically connected to the housing to ground the first and second terminals.

4. The electromagnetic flow meter of claim 3, wherein the first and second connectors are each made of a non-metallic, electrically conductive material; and/or the first joint and the second joint are made of conductive metal materials.

5. The electromagnetic flowmeter of claim 2 wherein said first junction and said second junction are each made of a non-conductive plastic.

6. The electromagnetic flow meter according to claim 5, further comprising:

the first grounding electrode and the second grounding electrode are electrically connected with the signal acquisition assembly; the first ground electrode and the second ground electrode can be partially disposed through the catheter to contact liquid flowing through the catheter.

7. The electromagnetic flowmeter of claim 6 wherein the first ground electrode and the second ground electrode are disposed at the inlet end and the outlet end of the liquid conduit, respectively; and/or the first grounding electrode, the detection electrode assembly and the second grounding electrode are sequentially arranged at intervals along the extending direction of the liquid guide pipe.

8. The electromagnetic flow meter according to claim 3, wherein the first connector has an inlet port, the main body support has an end surface portion, the first connector and the end surface portion cooperate to form a cavity, and the inlet port and the liquid guide tube are both in communication with the cavity.

9. The electromagnetic flowmeter of claim 8 wherein the number of conduits is at least two.

10. The electromagnetic flow meter of claim 9, wherein each of the liquid conduits is in communication with the cavity; and/or the number of detection electrode assemblies is the same as the number of catheters.

11. The electromagnetic flow meter of claim 1, wherein the first non-metallic material comprises: at least one of carbon nanotubes, graphene, carbon fibers and conductive plastics.

12. The electromagnetic flowmeter of claim 11 wherein said housing is formed from a blend of plastic and conductive filler material.

13. The electromagnetic flow meter of claim 12, wherein the plastic comprises at least one of polyethylene, polypropylene, polyvinyl chloride, polybutylene, or polystyrene; and/or the conductive filling material comprises at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber and graphite fiber.

14. The electromagnetic flow meter of claim 11, wherein the housing comprises:

the shell is made of non-conductive plastic;

and the conducting layer is arranged on the outer surface of the shell.

15. The electromagnetic flow meter of claim 1, wherein the catheter is made of a second non-metallic material.

16. The electromagnetic flow meter of claim 15, wherein the second non-metallic material comprises a dielectric plastic.

17. The electromagnetic flowmeter of claim 16 wherein the insulating plastic comprises at least one of a liquid crystal polymer, a polyphthalamide.

18. The electromagnetic flow meter according to claim 1, wherein the case has:

a base plate having a through hole;

and the side wall part is connected with the bottom plate to form an accommodating cavity used for accommodating at least part of the main body bracket, and the accommodating cavity is communicated with the through hole and is connected with the main body bracket.

19. The electromagnetic flow meter according to claim 18, wherein the body mount has an end surface portion connected to a side of the side wall portion remote from the bottom plate.

20. The electromagnetic flowmeter of any of claims 1-19 wherein said sensing electrode assembly comprises:

two detection electrodes respectively penetrate through two opposite sides of the liquid guide pipe.

21. The electromagnetic flowmeter of claim 20 wherein said sensing electrode is an electrode made of a third non-metallic material having an electrical conductivity.

22. The electromagnetic flow meter of claim 21, wherein the third non-metallic material comprises: at least one of carbon nanotubes, graphene, carbon fibers and conductive plastics.

23. The electromagnetic flowmeter of claim 20 wherein the signal acquisition assembly comprises:

the two signal acquisition boards are used for acquiring signals of the corresponding detection electrodes.

24. The electromagnetic flow meter of claim 23, further comprising:

the buffer piece is arranged between the shell and the signal acquisition assembly and used for buffering the vibration of the signal acquisition assembly.

25. The electromagnetic flow meter according to claim 24, wherein said buffer member is made of a flexible material having conductivity and elasticity.

26. The electromagnetic flow meter of claim 25, wherein the buffer comprises at least one of a conductive foam or a conductive sponge.

27. The electromagnetic flowmeter of claim 24 wherein the signal acquisition assembly further comprises:

and two ends of the electric connector are respectively and electrically connected with the two signal acquisition boards.

28. The electromagnetic flowmeter of claim 27 wherein said buffer is disposed between said housing and said electrical connector.

29. The electromagnetic flow meter of claim 27, wherein the electrical connections comprise at least one of a flexible flat cable, a flexible circuit board, and a flex cable.

30. The electromagnetic flowmeter of claim 27 wherein the electrical connections extend in a direction that intersects the axis of the coil assembly.

31. A spraying device, comprising:

a liquid supply tank;

the water pump is used for pumping liquid from the liquid supply tank;

the electromagnetic flow meter of any one of claims 1-30, in communication between the supply tank and the water pump, the electromagnetic flow meter being configured to detect a flow rate and/or velocity of liquid flowing from the supply tank into the water pump.

32. A movable platform, comprising:

a movable body;

the spray device of claim 31, mounted on the movable body.

33. The movable platform of claim 32, wherein the movable platform comprises:

at least one of an agricultural unmanned aerial vehicle, an agricultural spray vehicle and a manpower spraying device.