WO2021087705A1

WO2021087705A1 - Electromagnetic flowmeter, spraying apparatus, and movable platform

Info

Publication number: WO2021087705A1
Application number: PCT/CN2019/115457
Authority: WO
Inventors: 舒展; 周乐; 周万仁
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2019-11-04
Filing date: 2019-11-04
Publication date: 2021-05-14
Also published as: CN112154307A

Abstract

An electromagnetic flowmeter (40), a spraying apparatus (200), and a movable platform (100), an outer shell (41) of the electromagnetic flowmeter being an electrically conductive shell made of a first non-metal material, the outer shell (41) being grounded, and a detection electrode assembly (44) and a signal collection assembly (45) both being disposed in the outer shell (41), such that the outer shell (41) can perform electromagnetic shielding of the detection electrode assembly (44) and the signal collection assembly (45).

Description

Electromagnetic flowmeter, spray device and movable platform

Technical field

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

Background technique

In order to facilitate the control of the spraying flow and calculation of the sprayed amount of spray, the spraying device of the plant protection drone usually includes a water tank, an electromagnetic flowmeter and a water pump. The electromagnetic flowmeter is connected between the water tank and the water pump to measure the medicine flowing from the water tank through the pump. The flow rate of the liquid. However, in order to achieve functions such as grounding and electromagnetic shielding, the casing of the existing electromagnetic flowmeter is generally made of metal material, which causes the weight and cost of the electromagnetic flowmeter to increase greatly, which is not conducive to the weight-sensitive plant protection drones. And so on equipment use.

Summary of the invention

Based on this, the present application provides an electromagnetic flowmeter, a spray device and a movable platform, which aim to reduce the weight of the electromagnetic flowmeter and reduce the cost of the electromagnetic flowmeter.

According to the first aspect of this application, this application provides an electromagnetic flowmeter, including:

shell;

The main body bracket at least partially penetrates the housing and is connected to the housing;

The catheter is set on the main body bracket;

The detection electrode assembly is partially pierced with the catheter to contact the liquid flowing through each of the catheters;

A signal collection component, which is arranged on the main body support, is electrically connected to the detection electrode component, and is used to collect the signal of the detection electrode component;

The coil assembly is arranged on the main body support and is used to generate an electromagnetic field;

Wherein, the housing is a conductive housing made of a first non-metallic material, and the housing is grounded, and the detection electrode assembly and the signal acquisition assembly are both provided in the housing, so that the housing can Electromagnetic shielding is performed on the detection electrode assembly and the signal acquisition assembly.

According to the second aspect of the present application, the present application provides a spraying device, including:

Supply tank

A water pump for pumping liquid from the liquid supply tank;

A spray head is connected to the water pump, and the water pump delivers liquid to the spray head and sprays it out through the spray head;

The above electromagnetic flowmeter is connected between the liquid supply tank and the water pump, and the electromagnetic flowmeter is used to detect the flow rate and/or rate of the liquid flowing into the water pump from the liquid supply tank.

According to the third aspect of this application, this application provides a movable platform including:

Movable body

The above-mentioned spraying device is installed on the movable body.

The embodiment of the present application provides an electromagnetic flow meter, a spray device, and a movable platform. Since the housing is grounded, the detection electrode assembly and the signal acquisition board assembly are both arranged in the housing, so the housing can interact with the detection electrode assembly. The signal acquisition board assembly plays the role of electromagnetic shielding. Without adding an additional electromagnetic shielding cover, the external signal interference of the detection electrode assembly and the signal acquisition board assembly can be avoided by grounding the shell, The method of grounding the shell to achieve electromagnetic shielding does not increase the volume and weight of the electromagnetic flowmeter, and at the same time saves the cost of setting up an additional electromagnetic shielding cover. In addition, the shell is a conductive shell made of the first non-metallic material, and the shell can be grounded to achieve electromagnetic shielding without using a metal shell. The density of non-metallic materials is usually lower than that of metal materials, and the price of non-metallic materials is usually The price is lower than that of metal materials, so the use of a conductive shell made of non-metallic materials can greatly reduce the weight of the electromagnetic flowmeter and reduce the cost of the electromagnetic flowmeter.

Description of the drawings

In order to explain the technical solutions of the embodiments of the present application more clearly, the following will briefly introduce the drawings used in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present application. Ordinary technicians can obtain other drawings based on these drawings without creative work.

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

FIG. 2 is a schematic structural diagram from a perspective of a flow meter provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram from another angle of the flowmeter provided by an embodiment of the present application;

Figure 4 is an exploded schematic diagram of a flow meter provided by an embodiment of the present application;

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

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

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

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

Figure 9 is a schematic diagram of a housing provided by an embodiment of the present application;

FIG. 10 is a partial structural diagram of a flow meter provided by an embodiment of the present application, in which a signal acquisition component and a control board are shown;

Figure 11 is a partial structural diagram of a flow meter provided by an embodiment of the present application, which shows the main body bracket, the catheter and the second joint;

FIG. 12 is a schematic structural view from one angle of a housing provided by an embodiment of the present application;

FIG. 13 is a schematic structural diagram from another angle of the housing provided by an embodiment of the present application;

Fig. 14 is a partial structural diagram of a flow meter provided by an embodiment of the present application, in which the first joint is shown.

Description of reference signs:

1000. Movable platform; 100. Movable body; 200. Spraying device; 10. Liquid supply tank; 20. Water pump; 30. Sprinkler head; 40. Electromagnetic flowmeter;

41. Shell; 411, shell; 412, conductive layer; 413, bottom plate; 4131, through hole; 414, side wall portion; 415, accommodating cavity; 4151, opening;

42. Main body support; 421, end face; 422, diversion cone; 43, catheter; 44, detection electrode assembly; 441, detection electrode;

45. Signal acquisition component; 451. Signal acquisition board; 4511, electrical matching part; 452, electrical connector; 46, coil assembly; 461, coil; 462, iron core; 463, fixing frame; 47, control board; 471, Electrical connection

481. Buffer; 482, first joint; 4821, liquid inlet; 483, second joint; 484, first ground electrode; 485, second ground electrode; 486, cavity; 491, first seal; 492 , The second seal; 493, the third seal; 494, the electric plug.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of this application.

It should also be understood that the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit the application. As used in the specification of this application and the appended claims, unless the context clearly indicates other circumstances, the singular forms "a", "an" and "the" are intended to include plural forms.

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

The inventor of this application found that the spraying device of the plant protection drone usually includes a water tank, an electromagnetic flowmeter, a water pump, and a spray head connected to the water pump. The water pump draws liquid from the water tank and delivers the liquid to the spray head, and sprays the liquid out through the spray head. The shell used for the electromagnetic flowmeter is usually made of a metal material, which greatly increases the weight and cost of the flowmeter, which is not conducive to the use of weight-sensitive drones and other equipment.

In response to this discovery, the inventor of the present application has improved the electromagnetic flowmeter to effectively reduce the weight of the electromagnetic flowmeter and reduce the cost of the electromagnetic flowmeter. Specifically, the present application provides an electromagnetic flowmeter, including: a housing; a main body support, at least partially passing through the housing and connected to the housing; a catheter provided on the main body support; a detection electrode assembly, partly The catheter is pierced to contact the liquid flowing through each of the catheters; the signal acquisition board assembly is arranged on the main body support and is electrically connected to the detection electrode assembly for collecting the detection electrode assembly The signal; the coil assembly, which is provided on the main body support, is used to generate an electromagnetic field; wherein, the shell is a conductive shell made of a first non-metallic material, and the shell is grounded, the detection electrode assembly and The signal acquisition board components are all arranged in the housing, so that the housing can electromagnetically shield the detection electrode assembly and the signal acquisition board assembly.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. In the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

Referring to FIG. 1, an embodiment of the present application provides a movable platform 1000 including a movable body 100 and a spray device 200, and the spray device 200 is installed on the movable body 100. The mobile platform 1000 is used in the agricultural industry to spray pesticides, water and other liquids on agricultural products, forests, etc. The movable body 100 can realize movement, rotation, turning, etc., and the movable body 100 can drive the spraying device 200 to move to different positions or different angles to perform spraying operations in a preset area. The movable platform 1000 may include an agricultural spraying vehicle, an agricultural drone, or a human-powered spraying device, etc.; or the movable platform 1000 may be one of an agricultural spraying vehicle, an agricultural drone, or a human-powered spraying device in one form. In the form of agricultural spraying vehicles, agricultural drones or other types of human spraying devices.

The following description will be given by taking an example in which the movable platform 1000 is an agricultural drone and the sprayed liquid is a liquid medicine. It can be understood that the specific form of the movable platform 1000 is not limited to agricultural drones, and is not limited here.

Please refer to FIG. 1, in some embodiments, the spray 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 the liquid to be sprayed. The water pump 20 is used to extract liquid from the liquid supply tank 10. The spray head 30 is in communication with the water pump 20, and the water pump 20 delivers liquid to the spray head 30, and sprays the liquid out through the spray head 30, so as to perform the spraying operation. The electromagnetic flowmeter 40 is connected between the liquid supply tank 10 and the water pump 20. When the water pump 20 draws liquid from the liquid supply tank 10, the liquid in the liquid supply tank 10 flows through the electromagnetic flowmeter 40 to the water pump 20. At this time, the electromagnetic flowmeter 40 can detect the flow rate of the liquid flowing from the liquid supply tank 10 into the water pump 20 And/or rate.

It can be understood that the number of water pumps 20 can be designed according to actual requirements, for example, one, two, three or more. In some embodiments, the number of water pumps 20 is multiple, such as two, three, four or more, and the electromagnetic flowmeter 40 can detect the flow rate and/or of the liquid flowing from the liquid supply tank 10 into each water pump 20. Or rate. The water pumps 20 can work at the same time; it is also possible to select one or several water pumps 20 to work according to actual needs, and the remaining water pumps 20 do not work.

Please refer to FIGS. 4 to 8, where the electromagnetic flowmeter 40 includes a housing 41, a main body holder 42, a catheter 43, a detection electrode assembly 44, a signal acquisition assembly 45 and a coil assembly 46.

Referring to FIGS. 4 to 8, in some embodiments, the main body bracket 42 is connected to the housing 41. At least part of the main body bracket 42 penetrates the housing 41. The catheter 43 is arranged on the main body bracket 42. The detection electrode assembly 44 partially penetrates the catheter 43 to contact the liquid flowing through the catheter 43. The signal collection component 45 and the coil component 46 are both installed on the main body bracket 42. The signal collection component 45 is electrically connected to the detection electrode component 44 for collecting signals of the detection electrode component 44. The coil assembly 46 is used to generate an electromagnetic field.

Wherein, the housing 41 is a conductive housing 411 made of a first non-metallic material, and the housing 41 is grounded. The detection electrode assembly 44 and the signal acquisition assembly 45 are both arranged in the housing 41 so that the housing 41 can contact the detection electrode assembly 44. And the signal acquisition component 45 for electromagnetic shielding.

In the electromagnetic flowmeter 40 provided in the above embodiment, since the housing 41 is grounded, the detection electrode assembly 44 and the signal acquisition assembly 45 are both arranged in the housing 41, so the housing 41 can electromagnetically shield the detection electrode assembly 44 and the signal acquisition assembly 45. Function, without adding an additional electromagnetic shielding cover, grounding the housing 41 can avoid interference from external signals received by the detection electrode assembly 44 and the signal acquisition component 45. The housing 41 is grounded to achieve electromagnetic shielding without increasing electromagnetic The volume and weight of the flow meter 40 also save the cost of installing an additional electromagnetic shield. In addition, the housing 41 is a conductive housing 411 made of the first non-metallic material. The housing 41 can be grounded to achieve electromagnetic shielding without using the metal housing 41. The density of non-metallic materials is usually lower than that of metal materials. The price of the material is usually lower than that of the metal material. Therefore, the housing 41 made of conductive non-metallic material can greatly reduce the weight of the electromagnetic flowmeter 40 and reduce the cost of the electromagnetic flowmeter 40.

In some embodiments, the first non-metallic material includes at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other conductive and light-weight materials. Among them, conductive plastic refers to a thermoplastic plastic material mixed with metal particles and/or conductive nanoparticles. In some specific embodiments, the housing 41 is formed by using a mixture of plastic and conductive filler material. It can be understood that the conductive filler material has high conductivity and needs a sufficient amount to enable the particles between the filler materials to contact, so that the shell 41 can conduct electricity. Wherein, the plastic includes at least one of polyethylene, polypropylene, polyvinyl chloride, polybutene, polystyrene and the like. The conductive filler material includes at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber, graphite fiber, and the like.

Please refer to FIG. 9, in some embodiments, the housing 41 includes a housing 411 and a conductive layer 412. The housing 411 is made of non-conductive plastic, that is, the housing 411 is made of any non-conductive plastic. The conductive layer 412 is provided on the outer surface of the housing 411. Exemplarily, a conductive paint or an electroless metal plating layer is sprayed on the housing 411, so that all or part of the surface of the housing 411 can be electrically conductive, so that the housing 411 can be grounded to achieve electromagnetic shielding.

In some embodiments, the main body bracket 42 is a bracket made of plastic, so as to further reduce the weight of the electromagnetic flowmeter 40 and reduce the cost of the electromagnetic flowmeter 40. Of course, the material of the main body bracket 42 is not limited to plastic, and other lighter materials can be selected according to requirements.

In some embodiments, the catheter 43 is made of a second non-metallic material to further reduce the weight of the electromagnetic flowmeter 40 and reduce the cost of the electromagnetic flowmeter 40. Wherein, the second non-metallic material may be an insulating plastic, or any other material with a lighter texture and no conductivity. Insulating plastic refers to non-conductive plastic, that is, 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 plastics.

In some embodiments, the catheter 43 and the main body bracket 42 are integrally formed to reduce the assembly process and improve the processing efficiency of the electromagnetic flowmeter 40. In other embodiments, the catheter 43 and the main body bracket 42 may also be provided separately.

Please refer to FIGS. 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 penetrated on opposite sides of the catheter 43. Specifically, the detection ends of the two detection electrodes 441 can pass through the catheter 43 to be in contact with the liquid flowing through the catheter 43, and the detection ends of the two detection electrodes 441 are arranged oppositely. In order to enable the two detection electrodes 441 to better generate induced electromotive force, the two detection electrodes 441 are arranged coaxially, that is, the detection ends of the two detection electrodes 441 are aligned.

In some embodiments, the detection electrode 441 adopts an electrode made of a third non-metallic material with conductivity. The electromagnetic flowmeter 40 can detect the flow rate and/or velocity of the liquid in the catheter 43 without using a metal electrode, and further The weight of the electromagnetic flowmeter 40 is effectively reduced and the cost of the electromagnetic flowmeter 40 is reduced. The third non-metallic material includes at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other conductive and light-weight materials. Exemplarily, the detection electrode 441 is formed by using a mixture of plastic and conductive filler material. It can be understood that the conductive filler material has high conductivity and needs a sufficient amount to enable contact between particles between the filler materials, so that the detection electrode 441 can conduct electricity. Wherein, the plastic includes at least one of polyethylene, polypropylene, polyvinyl chloride, polybutene, polystyrene and the like. The conductive filler material includes at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber, graphite fiber, and the like.

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

In some embodiments, the detection electrode 441 adopts a multi-section columnar structure, and the detection electrode 441 is in clearance fit with the catheter 43 to facilitate the disassembly and assembly of the detection electrode 441. In order to improve the sealing performance between the detection electrode 441 and the catheter 43, a radial sealing ring is also provided between the detection electrode 441 and the catheter 43. Compared with the end face seal, the end face of the detection electrode 441 in the embodiment of the present application does not need Too much pressing force can ensure the sealing effect between the detection electrode 441 and the catheter 43, and prevent the liquid in the catheter 43 from flowing to the catheter 43 from the gap between the detection electrode 441 and the catheter 43 And the housing 41, so as to prevent the signal acquisition assembly 45 or other components from being damaged due to contact with water.

In some embodiments, the detection electrode 441 is in close contact with the signal collection component 45, and a conductive copper layer is arranged around the electrode hole of the signal collection component 45 to facilitate the electrical connection between the signal collection component 45 and the detection electrode 441. The signal collection component 45 and the detection electrode 441 can be soldered, thereby improving the contact reliability between the signal collection component 45 and the detection electrode 441. In order to improve the solderability of the detection electrode 441, the surface of the detection electrode 441 may be tin-plated.

Please refer to FIGS. 6 to 8 again. In some embodiments, the signal acquisition component 45 includes two signal acquisition boards 451, and the two signal acquisition boards 451 are electrically connected. The two signal collection boards 451 and the two detection electrodes 441 are correspondingly arranged on the same side of the main body bracket 42, and the two signal collection boards 451 are used to collect the signals of the corresponding side detection electrodes 441. The signal collection board 451 on each side collects the signal of the detection electrode 441 on the corresponding side, which can reduce signal interference.

Please refer to FIGS. 4 to 6 again. In some embodiments, the coil assembly 46 includes a coil 461, an iron core 462 and a fixing frame 463, and the coil 461 is wound on the iron core 462. The iron core 462 is arranged on the fixing frame 463 to restrict the direction of the magnetic field and reduce the phenomenon of magnetic leakage. The fixing frame 463 is installed on the main body bracket 42 or the catheter 43. The fixing frame 463 and the main body support 42 or between the fixing frame 463 and the catheter 43 can be connected in any suitable manner according to requirements, for example, by integral molding, or detachably connected by screws, bolts, buckles, or the like. Optionally, 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 can better generate an induced electromotive force.

The number of the coil assembly 46 can be set according to actual requirements, for example, it is designed to be one, two or more, as long as a magnetic field can be generated to generate an induced electromotive force in the detection in the catheter 43. When the number of catheters 43 is multiple and the number of coil assemblies 46 is multiple, the multiple coil assemblies 46 are symmetrically distributed in the middle of each catheter 43, so that the target position in each catheter 43 The magnetic field strength is basically the same to ensure the accuracy of flow detection. The target position is the position where the detection end or measurement plane of the detection electrode assembly 44 in each catheter 43 is located.

Please refer to FIGS. 4 to 6 again. Illustratively, the number of catheters 43 is four, which are arranged in parallel with each other, respectively, the

catheters

43a, 43b, 43c, and 43d, and the liquid flow direction is from top to bottom. The two detection electrodes 441 are arranged in the front-rear direction. The number of the coil assembly 46 is two, which are arranged symmetrically in the middle of the four catheters 43, that is, between the

catheters

43a and 43b, and between the

catheters

43c and 43d. The magnetic field direction is left and right, and The liquid flows vertically. The ions of the liquid flowing through the catheter 43 are deflected under the action of the electromagnetic field, and an electromotive force along the front and rear directions is generated. The magnitude of the electromotive force can be detected by using the detection electrode assembly 44. The electromagnetic flowmeter 40 adopts the detection principle of electromagnetic induction. The arrangement of the electromagnetic field, the catheter 43 and the two detection electrodes 441 are orthogonally distributed. The electromotive force and magnetic field strength are all proportional to the water flow speed and are detected by the detection electrode 441. The voltage thus reverses the size of the water flow.

It should be noted that the number of detection electrode assemblies 44 is the same as the number of catheters 43, and each catheter 43 is correspondingly provided with a detection electrode assembly 44. The number of the coil assembly 46 can be the same as or different from the number of the catheter 43, which is not limited here. Optionally, when the number of the coil components 46 is multiple, the multiple coil components 46 are coaxially arranged, so that the detection electrode 441 can better generate the induced electromotive force.

Please refer to FIGS. 4 and 6 to 8. In some embodiments, the electromagnetic flowmeter 40 further includes a control board 47. The control board 47 is electrically connected to the signal collection component 45, and is used to obtain the flow rate and/or rate of the liquid flowing through the catheter 43 according to the signal collected by the signal collection component 45. The control board 47 and the coil assembly 46 are disposed opposite to the two sides of the main body bracket 42. The control board 47 is electrically connected to one of the signal acquisition boards 451.

The number of catheters 43 can be set according to actual needs, for example, one, two, three or more. Please refer to FIG. 10. In some embodiments, the number of catheters 43 is at least two. The middle of the control board 47 is provided with an electrical connection portion 471, one of the signal acquisition boards 451 is provided with an electrical mating portion 4511, and the electrical connection portion 471 is electrically connected to the electrical mating portion 4511, so as to realize the electrical connection between the control board 47 and the signal acquisition component 45. Connection to improve the accuracy of flow detection. Specifically, one of the signal acquisition boards 451 is arranged adjacent to the control board 47, and the electrical matching portion 4511 is provided on the signal acquisition board 451 arranged adjacent to the control board 47 to facilitate the electrical connection portion 471 of the control board 47 to connect to the electrical matching portion. 4511, so as to realize the electrical connection between the signal acquisition component 45 and the control board 47.

Please refer to FIG. 5, illustratively, the number of catheters 43 is four, from left to right are

catheters

43a, 43b, 43c, 43d, and the electrical connection portion 471 and the electrical matching portion 4511 are respectively located on the control board 47 And the middle of one of the signal acquisition boards 451, so that the control board 47 and one of the signal acquisition boards 451 are electrically connected at the middle of each catheter 43, so as to ensure the detection circuit of the

catheter

43a, 43b and the catheter The detection loop lengths of 43c and 43d are approximately the same or have little difference, thereby improving the accuracy of flow detection.

In some embodiments, the detection circuit is arranged on the signal acquisition board 451, and the signal is relatively weak. The power signal and signal processing circuits such as calculation and amplification are arranged on the control board 47. The signal is relatively strong, which avoids the interference of the strong signal to the weak signal, thereby ensuring the accuracy of flow detection.

When the agricultural drone or other mobile platform 1000 is in operation and other scenarios, the signal collection component 45 in the agricultural drone is prone to vibration or shaking, which easily generates electromagnetic interference, thereby reducing the accuracy of flow detection. Please refer to FIGS. 5 and 6 again. In order to buffer the electromagnetic interference caused by the vibration of the signal acquisition component 45, the electromagnetic flowmeter 40 further includes a buffer 481 to ensure the accuracy of flow detection. The buffer 481 is arranged between the housing 41 and the signal collection assembly 45.

In some embodiments, the housing 41 can be grounded by directly contacting the signal acquisition component 45, or the housing 41 can be grounded by conductively connecting the housing 41 and the signal acquisition component 45 through a ground connection, which is not limited herein. The ground connection can be a screw, a bolt, a wire, or other conductive members.

Of course, the housing 41 can also be grounded by directly contacting the control board 47, or the housing 41 can be grounded by conductively connecting the housing 41 and the control board 47 through a ground connection, which is not limited here.

In some embodiments, the buffer 481 is made of a soft material with conductivity and elasticity. On the one hand, the buffer 481 can buffer the vibration of the signal collection component 45, and reduce or avoid electromagnetic interference caused by the vibration of the signal collection component 45. On the other hand, the buffer 481 has conductivity, and the housing 41 can be electrically connected to the signal collection assembly 45 through the buffer 481, so as to realize the grounding of the housing 41 and electromagnetic shielding of the detection electrode assembly 44 and the signal collection assembly 45. The buffer 481 can be selected from any conductive and elastic flexible material, such as at least one of conductive foam or conductive sponge.

Please refer to FIG. 6, in some embodiments, the signal acquisition component 45 further includes an electrical connector 452, and two ends of the electrical connector 452 are electrically connected to the two signal acquisition boards 451 respectively. The two signal acquisition boards 451 are electrically connected through the electrical connector 452, thereby forming 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 extending direction of the electrical connector 452 intersects the axis of the coil assembly 46. Specifically, the extension direction of the electrical connector 452 intersects the length extension direction of the iron core 462. The extension direction of the electrical connector 452 is the extension direction of the two electrical connection ends connected to the two signal collection boards 451.

In some embodiments, due to the difficulty of manufacturing a ring-shaped flexible circuit board, an embodiment of the present application uses a flexible circuit board to be bent around, and then two reinforcing plates are glued to form a signal acquisition board 451 and an electrical connector 452. The signal acquisition component 45 is easy to manufacture.

In some embodiments, the signal acquisition board 451 adopts a rigid circuit board, and the signal acquisition board 451 can directly compress the detection electrode 441, the first ground electrode 484 or the second ground electrode 485 to act as an electrode pressing sheet. There is no need to add additional electrode pressing pieces and screws for locking the electrode pressing pieces, the structure is compact, the material and assembly costs are reduced, and the weight of the electromagnetic flowmeter 40 is reduced. When the number of detection electrodes 441, first ground electrodes 484, and second ground electrodes 485 is large, the effect brought by this design is better and more significant.

Since 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, it will be affected by the changing magnetic field to generate induced electromotive force and interfere with the measurement signal. The existence of such interference will affect The stability of the flow rate signal reduces the detection accuracy. In order to avoid or reduce this interference, the extension direction of the electrical connector 452 is perpendicular to the length extension direction of the iron core 462, so that the signal detection loop of the signal acquisition component 45 is approximately parallel to the direction of the magnetic field, thereby ensuring the stability of the flow rate signal and improving Detection accuracy.

Referring to Figures 5, 7 and 8, in some embodiments, the electromagnetic flowmeter 40 further includes a first joint 482 and a second joint 483, the first joint 482 and the second joint 483 are respectively connected to the catheter 43 The liquid inlet end and the liquid outlet end are both installed on the housing 41. Specifically, the first joint 482 is connected to the liquid inlet end of the catheter 43 to flow in, and the second joint 483 is connected to the liquid outlet end of the catheter 43. The first joint 482 may be connected to an external structure such as a liquid storage tank through a pipeline, and the second structure may be connected to an external structure such as the water pump 20 through a pipeline, so as to realize the connection of the electromagnetic flowmeter 40 and the external structure.

In some embodiments, the first joint 482, the main body bracket 42 and the housing 41 are inserted through the first joint 482, the main body bracket 42 and the housing 41 by means of screws, nuts, etc., so that the first joint 482, the main body bracket 42 and the housing 41 are locked and fixed. The liquid pipe 43 is integrally formed, the catheter 43 and the main body bracket 42 are integrally formed, and the second joint 483 penetrates through the end of the housing 41 away from the first joint 482 and is snap-connected to the housing 41. This design can prevent the first pipe and the The second pipe falls off, which improves the stability of the electromagnetic flowmeter 40. In other embodiments, the first joint 482 and the second joint 483 may be connected to the main body bracket 42, the housing 41 or the catheter 43 in any other suitable manner. For example, the first joint 482 and the main body bracket 42 are integrally formed, The main body bracket 42 and the housing 41 are locked by a fastener, the second joint 483 is screwed to the housing 41, and the like.

In the existing electromagnetic flowmeter 40, the potential of the liquid flowing through the catheter 43 may be different at different positions of the catheter 43, and the potential reference referenced by the two detection electrodes 441 may be inconsistent during detection, resulting in detection The accuracy is low. For this, in some embodiments, both the first connector 482 and the second connector 483 are electrically conductive and are electrically connected to the housing 41, and the housing 41 is electrically connected to the signal acquisition component 45 or the control board 47, so the first connector 482 and The second joint 483 can be grounded through the housing 41. The grounding of the first joint 482 and the second joint 483 makes the liquid potential in the catheter 43 zero, and the two detection electrodes 441 both detect the electromotive force based on the zero potential of the liquid, thereby improving the accuracy of flow detection. In some embodiments, the first connector 482, the main body bracket 42 and the housing 41 are penetrated through conductive screws or nuts, so that the first connector 482 and the housing 41 are locked and fixed and electrically connected.

Wherein, the first joint 482 and the second joint 483 may be made of any suitable conductive material, for example, a conductive metal material or a non-metallic conductive material. In some embodiments, the non-metallic conductive material includes at least one of carbon nanotubes, graphene, carbon fibers, conductive plastics, and other conductive and light-weight materials to further reduce the weight of the electromagnetic flowmeter 40 and The cost of the electromagnetic flowmeter 40 is reduced.

In some embodiments, both the first joint 482 and the second joint 483 are made of non-conductive plastic, so as to reduce the weight of the electromagnetic flowmeter 40 and reduce the cost of the electromagnetic flowmeter 40. Please refer to Figure 4, Figure 5, Figure 7 and Figure 8, in order to improve the accuracy of flow detection, the electromagnetic flowmeter 40 also includes a first ground electrode 484 and a second ground electrode 485, the first ground electrode 484 and the second ground electrode 485 can The catheter 43 is partially penetrated to contact the liquid flowing through the catheter 43. Both the first ground electrode 484 and the second ground electrode 485 are electrically connected to the signal acquisition component 45 or the control board 47, so that the potential of the liquid in the catheter 43 is zero, and the two detection electrodes 441 are based on the zero potential of the liquid. The electromotive force is detected, thereby improving the accuracy of flow detection.

In some embodiments, the first ground electrode 484 and the second ground electrode 485 can be arranged at any suitable position as required, as long as the detection electrode assembly 44 is arranged between the first ground electrode 484 and the second ground electrode 485. Specifically, the first ground electrode 484, the detection electrode assembly 44, and the second ground electrode 485 are sequentially spaced apart along the extension direction of the catheter 43. More specifically, the first ground electrode 484 and the second ground electrode 485 are respectively provided at the liquid inlet end and the liquid outlet end of the catheter 43.

Referring to Figure 11, in conjunction with Figures 5 and 7, in some embodiments, the first joint 482 has a liquid inlet 4821, the main body bracket 42 has an end face 421, and the first joint 482 and the end face 421 cooperate to form a cavity 486. Both the liquid inlet 4821 and the catheter 43 are in communication with the cavity 486. The first joint 482, the end face 421 and the housing 41 are penetrated by a locking member such as a screw, so that the first joint 482, the main body bracket 42 and the housing 41 are locked and fixed.

Please refer to FIG. 11, in conjunction with FIG. 5, in some embodiments, the number of catheters 43 is at least two, and each catheter 43 is in communication with the cavity 486. The electromagnetic flowmeter 40 further includes a diversion cone 422, which extends along the end surface 421 toward the liquid inlet 4821 of the first joint 482. The guide cone 422 cooperates with the first joint 482 to make the liquid in the liquid inlet 4821 of the first joint 482 move stably to the detection end or the measurement plane of the detection electrode assembly 44, avoiding direct impact of the liquid flowing out of the first joint 482 The detection end or measurement plane located in the catheter 43 causes problems such as flow velocity reduction, energy loss, and pressure drop and vortex generation, which reduces fluid rotation along the axis and other unstable motions, thereby improving flow measurement accuracy.

In some embodiments, the centerline of the diversion cone 422 and the centerline of the first joint 482 substantially coincide. Specifically, the center line of the diversion cone 422 and the center line of the first joint 482 approximately coincide. The diversion cone 422 is arranged directly opposite to the liquid inlet 4821 of the first joint 482 to ensure that the diversion cone 422 can adjust the flow field and/or flow direction of the liquid flowing into each liquid guide tube 43, and avoid the liquid flowing out of the outlet end cavity 486 It directly impacts the detection end or measurement plane of the electromagnetic flowmeter 40, thereby improving the flow measurement accuracy of the electromagnetic flowmeter 40. The diversion cone 422 can be integrally formed with the main body bracket 42 or can be arranged separately, which is not limited here.

In some embodiments, the cross-sectional area of the end of the diversion portion away from the main body bracket 42 is smaller than the cross-sectional area of the end adjacent to the main body bracket 42, so that the liquid flowing in the liquid inlet 4821 of the first joint 482 is smoothly diverted to each guide液管43。 Liquid pipe 43.

Referring to FIGS. 12 and 13, in some embodiments, the housing 41 has a bottom plate 413 and a side wall portion 414. The bottom plate 413 has a through hole 4131, and the through hole 4131 is used for the catheter 43 to pass through or the second connector 483 to pass through. The side wall portion 414 and the bottom plate 413 are connected to form a receiving cavity 415 communicating with the through hole 4131. The accommodating cavity 415 is used for accommodating at least a part of the main body bracket 42, that is, a part of the main body bracket 42 is accommodated in the accommodating cavity 415, or the entire main body bracket 42 is accommodated in the accommodating cavity 415. The accommodating cavity 415 has an opening 4151 for the main body bracket 42 to enter the accommodating cavity 415. The side wall portion 414 is connected to the main body bracket 42 so as to fix the main body bracket 42 on the housing 411. The side wall portion 414 and the main body bracket 42 can be connected and fixed by any suitable connection method, for example, the main body bracket 42 is locked and fixed on the side wall portion 414 by a locking member such as a screw. The catheter 43, the detection electrode assembly 44, the signal acquisition assembly 45, the coil assembly 46 and part of the main body holder 42 enter the accommodating cavity 415 from the opening 4151. The catheter 43 or the second joint 483 penetrates through the hole 4131 and is partially exposed. The housing 41 is external to facilitate assembly and connection with external structures.

Referring to FIGS. 5, 7 and 8, in some embodiments, a first sealing member 491 is provided between the first joint 482 and the end surface 421 of the main body bracket 42, and the first sealing member 491 is used to prevent the cavity 486 The liquid inside leaks from the gap between the first joint 482 and the end surface 421 of the main body bracket 42, thereby improving the sealing performance of the electromagnetic flowmeter 40.

If the sealing between the main body bracket 42 and the housing 41, or the connection between the second joint 483 and the housing 41 is not good, the water outside the housing 41 (mainly moisture in the air) will easily escape from the main body bracket 42 and the housing 41. The gap between the housing 41 or the gap between the housing 41 and the second connector 483 flows into the housing 41, which may cause the signal acquisition board 451 and the control board 47 in the housing 41 to meet water and short-circuit, and may also cause the Other parts are damaged when exposed to water, thereby causing damage to the electromagnetic flowmeter 40. To this end, please refer to Figures 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 is used to prevent water from passing through the gap between the main body bracket 42 and the housing 41 Flows into the housing 41. The second joint 483 and the housing 41 are provided with a third sealing member 493, and the third sealing member 493 is used to prevent water from flowing into the housing 41 from the gap between the second joint 483 and the housing 41.

Wherein, the first sealing member 491, the second sealing member 492, and the third sealing member 493 can be made of at least one of rubber, silica gel, or other sealing materials. The materials of the first sealing member 491, the second sealing member 492, and the third sealing member 493 may be the same or different, and are not limited herein.

Referring to FIGS. 4 and 8, in some embodiments, the electromagnetic flowmeter 40 further includes an electrical plug 494, which is used to connect to an external power source, so that the electromagnetic flowmeter 40 is energized to work.

Hereinafter, the assembly process of the electromagnetic flowmeter 40 will be described by taking the catheter 43 and the main body bracket 42 integrally formed, and the second joint 483 and the catheter 43 integrally formed as an example.

The detection electrode assembly 44 is arranged on the catheter 43. The coil assembly 46 is installed on one side of the main body bracket 42 through a quick release. The signal collection assembly 45 is installed on the main body bracket 42 through a quick-release part, wherein the catheter 43 passes through the signal acquisition assembly 45, and the catheter 43 is located between the two signal acquisition boards 451. The control board 47 is installed on the other opposite side of the main body bracket 42 through a quick release piece. The main body bracket 42 with the catheter 43, the detection electrode assembly 44, the coil assembly 46, the signal acquisition assembly 45 and the control board 47 is installed on the housing 41 through a quick release. The end surface 421 is fastened to the housing 41 through the first joint 482 and the end surface 421 of the main body bracket 42 through a quick release tool, thereby completing the assembly of the electromagnetic flowmeter 40. Among them, the quick-release parts can be screws, screws or other quick-release parts, which are not limited here.

The above are only specific implementations of this application, but the protection scope of this application is not limited to this. Anyone familiar with the technical field can easily think of various equivalents within the technical scope disclosed in this application. Modifications or replacements, these modifications or replacements shall be covered within the scope of protection of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

Claims

An electromagnetic flowmeter, which is characterized in that it comprises:

shell;

The main body bracket at least partially penetrates the housing and is connected to the housing;

The catheter is set on the main body bracket;

The detection electrode assembly is partially pierced with the catheter to contact the liquid flowing through each of the catheters;

A signal collection component, which is arranged on the main body support, is electrically connected to the detection electrode component, and is used to collect the signal of the detection electrode component;

The coil assembly is arranged on the main body support and is used to generate an electromagnetic field;

Wherein, the housing is a conductive housing made of a first non-metallic material, and the housing is grounded, and the detection electrode assembly and the signal acquisition assembly are both arranged in the housing, so that the housing can Electromagnetic shielding is performed on the detection electrode assembly and the signal acquisition assembly.
The electromagnetic flowmeter according to claim 1, wherein the electromagnetic flowmeter further comprises:

The first joint and the second joint are respectively connected to the liquid inlet end and the liquid outlet end of the catheter, and both are installed on the housing.
The electromagnetic flowmeter according to claim 2, wherein the first connector and the second connector are both conductive and electrically connected to the housing, so that the first connector and the second connector The connector is grounded.
The electromagnetic flowmeter according to claim 3, wherein the first joint and the second joint are both made of non-metallic conductive materials; and/or, the first joint and the second joint All are made of conductive metal materials.
The electromagnetic flowmeter according to claim 2, wherein the first joint and the second joint are both made of non-conductive plastic.
The electromagnetic flowmeter according to claim 5, wherein the electromagnetic flowmeter further comprises:

Both the first ground electrode and the second ground electrode are electrically connected to the signal acquisition component; the first ground electrode and the second ground electrode can partially penetrate the catheter to contact the fluid flowing through the catheter The liquid in the tube.
The electromagnetic flowmeter according to claim 6, wherein the first ground electrode and the second ground electrode are respectively provided at the liquid inlet end and the liquid outlet end of the catheter; and/or, The first ground electrode, the detection electrode assembly, and the second ground electrode are sequentially spaced apart along the extension direction of the catheter.
The electromagnetic flowmeter according to claim 3, wherein the first joint has a liquid inlet, the main body bracket has an end face, the first joint cooperates with the end face to form a cavity, and the inlet Both the liquid port and the catheter are in communication with the cavity.
The electromagnetic flowmeter according to claim 8, wherein the number of the catheter is at least two.
The electromagnetic flowmeter according to claim 9, wherein each of the catheters is in communication with the cavity; and/or, the number of the detection electrode assemblies is the same as the number of the catheters.
The electromagnetic flowmeter according to claim 1, wherein the first non-metallic material comprises at least one of carbon nanotubes, graphene, carbon fibers, and conductive plastics.
The electromagnetic flowmeter according to claim 11, wherein the housing is formed by mixing plastic and conductive filler material.
The electromagnetic flowmeter according to claim 12, wherein the plastic includes at least one of polyethylene, polypropylene, polyvinyl chloride, polybutene, or polystyrene; and/or, the conductive filler The material includes at least one of carbon fiber, carbon black, metal conductive powder, metalized glass fiber, and graphite fiber.
The electromagnetic flowmeter according to claim 11, wherein the housing comprises:

The shell is made of non-conductive plastic;

The conductive layer is arranged on the outer surface of the casing.
The electromagnetic flowmeter according to claim 1, wherein the catheter is made of a second non-metallic material.
The electromagnetic flowmeter according to claim 15, wherein the second non-metallic material comprises insulating plastic.
The electromagnetic flowmeter according to claim 16, wherein the insulating plastic comprises at least one of liquid crystal polymer and polyphthalamide.
The electromagnetic flowmeter according to claim 1, wherein the housing has:

Bottom plate with through holes;

The side wall part is connected with the bottom plate to form an accommodating cavity for accommodating at least a part of the main body bracket, and the accommodating cavity is communicated with the through hole and connected with the main body bracket.
The electromagnetic flowmeter according to claim 18, wherein the main body bracket has an end face, and the end face is connected to a side of the side wall away from the bottom plate.
The electromagnetic flowmeter according to any one of claims 1-19, wherein the detection electrode assembly comprises:

Two detection electrodes are respectively pierced on opposite sides of the catheter.
The electromagnetic flowmeter according to claim 20, wherein the detection electrode is an electrode made of a third non-metallic material with conductivity.
The electromagnetic flowmeter according to claim 21, wherein the third non-metallic material comprises at least one of carbon nanotubes, graphene, carbon fibers, and conductive plastics.
The electromagnetic flowmeter according to claim 20, wherein the signal acquisition component comprises:

Two signal acquisition boards, the two signal acquisition boards and the two detection electrodes are correspondingly arranged on the same side of the main body support, and the two signal acquisition boards are used to collect the signals of the detection electrodes on the corresponding side.
The electromagnetic flowmeter according to claim 23, wherein the electromagnetic flowmeter further comprises:

The buffer is arranged between the housing and the signal acquisition component, and is used to buffer the vibration of the signal acquisition component.
The electromagnetic flowmeter according to claim 24, wherein the buffer member is made of a soft material with conductivity and elasticity.
The electromagnetic flowmeter according to claim 25, wherein the buffer member comprises at least one of conductive foam or conductive sponge.
The electromagnetic flowmeter according to claim 24, wherein the signal acquisition component further comprises:

The two ends of the electrical connector are respectively electrically connected to the two signal acquisition boards.
The electromagnetic flowmeter according to claim 27, wherein the buffer member is provided between the housing and the electrical connection member.
The electromagnetic flowmeter according to claim 27, wherein the electrical connector comprises at least one of a flexible flat cable, a flexible circuit board, and a flexible flat cable.
The electromagnetic flowmeter according to claim 27, wherein the extension direction of the electrical connector intersects the axis of the coil assembly.
A spraying device, characterized in that it comprises:

Supply tank

A water pump for pumping liquid from the liquid supply tank;

A spray head is connected to the water pump, and the water pump delivers liquid to the spray head and sprays it out through the spray head;

The electromagnetic flowmeter according to any one of claims 1-30, which is connected between the liquid supply tank and the water pump, and the electromagnetic flowmeter is used to detect the liquid flowing into the water pump from the liquid supply tank The flow rate and/or rate.
A movable platform, characterized in that it comprises:

Movable body

The spray device of claim 31, which is installed on the movable body.
The movable platform according to claim 32, wherein the movable platform comprises:

At least one of agricultural drones, agricultural spraying vehicles, and human spraying devices.