WO2021243506A1

WO2021243506A1 - Liquid level meter, spraying assembly, and unmanned aerial vehicle

Info

Publication number: WO2021243506A1
Application number: PCT/CN2020/093703
Authority: WO
Inventors: 舒展; 孟祥�; 周万仁
Original assignee: 深圳市大疆创新科技有限公司
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2021-12-09
Also published as: CN113795732A

Abstract

Disclosed is a liquid level meter, comprising a measurement assembly (10) and a detection device (20). The measurement assembly (10) comprises a first measured unit (11), a second measured unit (12) and a connecting piece (13), wherein the connecting piece (13) is configured to flexibly connect the first measured unit (11) and the second measured unit (12); and after the first measured unit (11) rises to a first height in a liquid, the first measured unit (11) can drive the second measured unit (12) to float by means of the connecting piece (13). The detection device (20) can detect the position of at least one of the first measured unit (11) and the second measured unit (12), and generate a liquid level measurement signal on the basis of detected position information. In the liquid level meter, the second measured unit and the first measured unit are arranged in linkage manner, such that when the first measured unit exceeds a measurement range, the second measured unit can be detected, thereby increasing the total range of the liquid level meter. Further disclosed are a spraying assembly provided with the liquid level meter, and an unmanned aerial vehicle.

Description

Level gauges, spray components and unmanned aerial vehicles

Technical field

The embodiments of the present application relate to the technical field of aircraft, and in particular to a liquid level gauge, a spray assembly and an unmanned aerial vehicle.

Background technique

The level gauge generally includes a detection device and a float to be detected. The float floats on the liquid surface. The detection device is set on the water tank or on the fuselage. The float is close to the detection device and the detection device generates a signal. The detection device detects the position of the float. Calculate the height of the liquid level.

In the related technology, the length of the detection device is set to obtain the total range of the level gauge. Since the range of the detection device limits the total range of the entire level gauge, the detection device usually needs to be installed throughout the entire water tank. As a result, the cost of the overall level gauge is relatively high.

Summary of the invention

The embodiments of the present application provide a high-range liquid level gauge, spray assembly and unmanned aerial vehicle.

In a first aspect, the present application provides a level gauge, which includes:

The measuring assembly includes a first measured unit that can float in liquid, a second measured unit that can sink in the liquid, and a connecting piece; the connecting piece is configured to flexibly connect the first measured unit and the second measured unit A unit under test, and after the first unit under test rises to a first height in the liquid, the first unit under test can drive the second unit under test to float up through the connecting piece;

A detection device configured to detect the position of at least one of the first unit under test and the second unit under test, and generate a liquid level measurement signal based on the detected position information.

In a second aspect, the present application provides a spray assembly, the spray assembly includes: a water tank for containing liquid, a liquid drive device, a spray head assembly, and the liquid level gauge provided in the present application, the liquid drive device and the The water tank is in communication, the spray head assembly is in communication with the liquid driving device, and the liquid level gauge is at least partially arranged in the water tank.

In a third aspect, the present application provides an unmanned aerial vehicle. The unmanned aerial vehicle includes a central body, an arm, and a propeller. The central body includes the spray assembly provided in the present application, and one end of the arm is connected to The central body is connected, and the other end of the arm is connected to the propeller.

Based on the above, the positive effect of the level gauge provided by the present application is that the connecting piece is configured to flexibly connect the first unit under test and the second unit under test, and when the first unit under test is in After the liquid rises to the first height, the first unit under test can drive the second unit under test to float up through the connecting piece. As a result, the range of the level gauge is no longer limited by the detection range of the detection device, and the total range of the level gauge is increased.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of a liquid level gauge provided by an embodiment of the application;

2 is a schematic cross-sectional view of an assembly structure of a level gauge and a water tank provided by an embodiment of the application;

3 is a schematic cross-sectional view of the level gauge and the water tank when the liquid in the water tank in FIG. 2 is at a liquid level;

4 is a schematic cross-sectional view of the level gauge and the water tank when the liquid in the water tank in FIG. 2 is at another level;

5 is a partial cross-sectional view of the assembly structure of the liquid level gauge and the guide assembly provided by an embodiment of the application;

6 is a partial cross-sectional view of an assembly structure of a level gauge and a water tank provided by an embodiment of the application;

Fig. 7 is a partial cross-sectional view of the level gauge and the water tank when the liquid in the water tank in Fig. 6 is at a liquid level;

Fig. 8 is a partial cross-sectional view of the level gauge and the water tank when the liquid in the water tank in Fig. 6 is at another level;

FIG. 9 is a schematic diagram of the structure of an unmanned aerial vehicle provided by an embodiment of the application;

FIG. 10 is a schematic diagram of an exploded structure of FIG. 9;

FIG. 11 is a schematic cross-sectional view of FIG. 9.

detailed description

The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

It should be noted that in the description of this application, the terms "first" and "second" are only used to facilitate the description of different components, and cannot be understood as indicating or implying the order relationship, relative importance, or implicitly indicating what is indicated. The number of technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of this application. The terminology used in the specification of the application herein is only for the purpose of describing specific embodiments, and is not intended to limit the application.

The level gauge in the related art generally includes a detection device and a float to be detected. The float floats on the liquid surface. The detection device is set on the water tank or on the fuselage. The float is close to the detection device to cause the detection device to generate a signal. The position of the float is used to calculate the height of the liquid level. The length of the detection device is set to obtain the total range of the level gauge. Since the detection range of the detection device limits the total range of the entire level gauge, the detection device usually needs to be set throughout the entire water tank, which results in the overall The cost of the level gauge is higher. The detection device is generally installed on the fuselage. When the water tank is higher than the fuselage, it is difficult to install a detection device for measurement on the part of the water tank above the fuselage.

In view of this, the present application provides a liquid level gauge. The second measured unit and the first measured unit are linked together. When the liquid level exceeds the detection range of the detection device, that is, the first measured unit exceeds the detection range. For the detection range of the device, the second unit under test can be detected by the detection device, so that the range of the level gauge is no longer limited by the detection range of the detection device, and the total range of the level gauge is increased.

Hereinafter, some embodiments of the present application will be described in detail with reference to the accompanying drawings. Provided that there is no conflict between the various embodiments, the following embodiments and the features in the embodiments can be combined with each other.

Fig. 1 is a schematic diagram of the structure of a level gauge provided by an embodiment of this application; Fig. 2 is a schematic cross-sectional view of an assembly structure of a level gauge and a water tank provided by an embodiment of the application; Fig. 3 is a liquid level of the water tank in Fig. 2 Fig. 4 is a schematic cross-sectional view of the level gauge and the water tank when the liquid in the water tank in Fig. 2 is at another level; Fig. 5 is a schematic cross-sectional view of the level gauge and the water tank provided by an embodiment of the application A partial cross-sectional view of the assembly structure of the guide assembly; FIG. 6 is a partial cross-sectional view of an assembly structure of the level gauge and the water tank provided by the embodiment of the application; Cross-sectional view; Figure 8 is a partial cross-sectional view of the level gauge and the water tank when the tank liquid in Figure 6 is at another level.

Please refer to Figures 1 to 4, this embodiment provides a level gauge 100. The level gauge 100 includes a measurement assembly 10 and a detection device 20. The measurement assembly 10 includes a first measured unit 11 that can float in liquid and can The second unit under test 12 submerged in the liquid and the connector 13. The connector 13 is configured to flexibly connect the first unit under test 11 and the second unit under test 12, and after the first unit under test 11 rises to a first height in the liquid, the first unit under test 11 can pass through the connector 13 drives the second unit under test 12 to float up.

The detection device 20 is configured to detect the position of at least one of the first unit under test 11 and the second unit under test 12, and generate a liquid level measurement signal based on the detected position information.

The level gauge 100 is an instrument used to measure the liquid level, and the height of the liquid in the container is called the liquid level. The first unit under test 11 and the second unit under test 12 are components that can be detected by the detection device 20, and the types of the first unit under test 11 and the second unit under test 12 vary depending on the detection device 20 selected.

In this embodiment, the first unit under test 11 has buoyancy, which is greater than the sum of the gravity generated by the first unit under test 11, the second unit under test 12, and the connecting member 13. The second unit under test 12 is fixedly connected to the connecting member 13, and the second unit under test 12 can be submerged in liquid. It should be noted that the above description is not a limitation on the properties of the second tested unit 12, but only an explanation of the state of the second tested unit 12 in the liquid. It can be understood that the second unit under test 12 can sink in the liquid by its own gravity or the second unit under test 12 can be submerged in the liquid under the action of the connecting member 13.

The first tested unit 11 can move up and down with the rise and fall of the liquid level. The first tested unit 11 and the second tested unit 12 are flexibly connected by the connecting piece 13. The flexible connection should be understood as when the first tested unit 11 follows After the liquid level rises to the first height, the first unit under test 11 interacts with the connecting piece 13, which connects the second unit under test 12 with the first unit under test 11, and the second unit under test 12 with the first unit under test. A unit under test 11 is linked, so that the second unit under test 12 can float up with the first unit under test 11. The flexible connection can be realized by setting a connecting rope with the same length as the first height or setting a connecting rod 131. When the first unit under test 11 moves to the first height, the first unit under test 11 exerts a force on the connection member 13, and the connection member 13 can transmit the force to the second unit under test 12, making the second unit under test 12 12 floats up.

The detection device 20 can be a photoelectric sensor or a magnetic sensor, as long as it can detect the movement of the first unit 11 and the second unit 12 that change with the liquid level.

In the first way, the detection device 20 uses a photoelectric sensor. The first unit under test 11 and the second unit under test 12 can block or reflect light signals. The feedback optical signal generates a corresponding liquid level measurement signal.

In the second way, the detection device 20 uses a magnetic sensor. The first unit under test 11 and the second unit under test 12 have magnetism and can generate a magnetic field. The detection device 20 is based on the first unit under test 11 and the second unit under test 12 The magnetic field signal fed back generates a corresponding liquid level measurement signal.

It should be noted that the detection device 20 is not limited to the above two implementation manners, and any manner in which the detection device 20 can detect the movement of the first unit under test 11 and the second unit under test 12 falls within the protection scope of this application.

In this embodiment, the Hall sensor 21 in the magnetic sensor is selected for specific description. The Hall sensor 21 is a magnetic field sensor made according to the Hall effect. The first unit under test 11 and the second unit under test 12 have magnets that can generate a magnetic field. The intensity of the magnetic field is different, and the detection device 20 distinguishes the first unit under test 11 and the second unit under test 12 according to the intensity of the magnetic field. The detection device 20 is arranged by a plurality of Hall sensors 21. When a magnet approaches a certain Hall sensor 21 on the detection device 20, the Hall sensor 21 senses the magnetic field and generates an electrical signal, which can be generated in combination with the position of the detection device 20 itself. The level measurement signal of the component under test.

It is understandable that the preset total range of the level gauge 100 is limited by the detection range of the detection device 20, and the detection range of the detection device 20 is determined by the number of sensors set. The connected first unit under test 11 and second unit under test 12 increase the total range preset by the level gauge 100 without changing the detection range of the detection device 20.

Please refer to Figures 2 to 4 for the specific working process. The container in Figure 2 is in an empty state. The first unit under test 11 and the second unit under test 12 are both located at the bottom of the container due to their own gravity. The detection device 20 can detect The position information to the first unit under test 11 and the second unit under test 12 is used to generate a liquid level measurement signal based on the position information.

The container in Figure 3 contains a certain amount of liquid, and the liquid level is below the first height. The first unit under test 11 floats on the liquid surface under its own buoyancy, while the second unit under test 12 is located at the bottom of the container. At this time, the detection device 20 can detect the first unit under test 11 and the second unit under test. 12 position information, based on the position information to generate a liquid level measurement signal.

The container in Figure 4 contains a certain amount of liquid, and the liquid level is above the first height. The first unit under test 11 floats above the liquid surface under its own buoyancy, while the second unit under test 12 floats up under the force of the first unit under test 11, at this time the first unit under test 11 has exceeded the detection device Outside the detection range of 20, the detection device 20 can only detect the position information of the second measured unit 12, and generate a liquid level measurement signal based on the position information.

By linking the second tested unit 12 with the first tested unit 11, when the liquid level exceeds the detection range of the detection device 20, that is, the first tested unit 11 exceeds the detection range of the detection device 20, and the second tested unit 11 The unit 12 can be detected by the detection device 20, so that the range of the level gauge 100 is no longer limited by the detection range of the detection device 20, and the preset total range of the level gauge 100 is equal to the detection range of the detection device 20 plus the first height , So as to realize the technical effect of increasing the total range of the liquid level gauge 100 without increasing the detection range of the detection device 20.

Further, the first height is less than or equal to the detection range of the detection device 20. The liquid level gauge 100 is continuously measured during the working process, and the liquid level can be detected at each position within the preset total range of the liquid level gauge 100. In this embodiment, the first height can be set to be less than or equal to the detection range of the detection device 20, that is, the length of the connecting member 13 is less than or equal to the detection range of the detection device 20. After the first unit under test 11 rises, the connection member 13 drives the second unit under test 12 to float up, and the level gauge 100 can continuously measure.

Further, the detection device 20 is arranged in a vertical direction and the bottom of the detection device 20 is flush with the lowest point of the liquid surface. The placement of the detection device 20 is generally set along the direction of movement of the liquid surface. The detection device 20 can be set perpendicular to the liquid surface or set at a certain angle with the liquid surface. When the detection device 20 is set perpendicular to the liquid surface, the detection device The length of 20 is the shortest and the detection efficiency is the highest. The bottom of the detection device 20 is flush with the lowest point of the liquid level, which is the state when no liquid is present, that is, the bottom of the detection device 20 is flush with the bottom of the container for liquid.

In some alternative embodiments, the preset total range of the level gauge 100 is equal to twice the detection range of the detection device 20, the first height is equal to the detection range of the detection device 20, and the first unit under test 11 and the second The length of the connecting member 13 between the tested units 12 is equal to the first height. Specifically, the first height is set to be equal to the detection range of the detection device 20, that is, the length of the connecting member 13 between the first tested unit 11 and the second tested unit 12 is equal to the first height, and the first tested unit 11 When it rises to the limit of the detection range of the detection device 20, the second tested unit 12 is then driven to float up. The second tested unit 12 can float up to one detection range. The total range of the level gauge 100 is two detection ranges. The total range of the level gauge 100 has doubled, and the range of the level gauge 100 has increased the most.

Please refer to FIGS. 1-2. In some alternative embodiments, the level gauge 100 further includes a guide assembly 30 for guiding the movement direction of the first unit under test 11 and the second unit under test 12. In order to enable the first unit under test 11 and the second unit under test 12 to move smoothly up and down with the liquid surface, on the basis of this embodiment, the guide assembly 30 can adopt a structure that can realize a guide function in the prior art, such as a guide Guide structures such as rails, guide rods 31 or guide grooves. The guide assembly 30 can even make the first unit under test 11 and the second unit under test 12 move up and down smoothly, increasing the stability and measurement accuracy of the level gauge 100.

Further, the guide assembly 30 includes a guide rod 31 arranged in a vertical direction, and the first tested unit 11 and the second tested unit 12 can slide relative to the guide rod 31. Specifically, the guide assembly 30 includes a guide rod 31 arranged in a vertical direction, that is, the guide rod 31 is arranged perpendicular to the liquid surface, the first tested unit 11 and the second tested unit 12 and the guide rod 31 can slide relatively, and the guide rod 31 Guide the first measured unit 11 and the second measured unit 12 to move in the vertical direction, so that the first measured unit 11 and the second measured unit 12 move more smoothly, and improve the working accuracy and reliability of the level gauge 100 .

Further, the guide rod 31 is provided with a sliding rail 311, the first unit under test 11 is provided with a first sliding groove 111 that is adapted to the sliding rail 311, and the second unit under test 12 is provided with a sliding rail 311 that is adapted to The second chute 121. Specifically, the slide rail 311 is arranged along the extension direction of the guide rod 31, the cross section of the slide rail 311 is adapted to the cross section of the first slide groove 111 and the second slide groove 121, and the slide rail 311 slides with the first slide groove 111 Connected, the sliding rail 311 is slidably connected with the second sliding groove 121.

Furthermore, the sliding rail 311 is provided on the outer surface of the guide rod 31. The first sliding groove 111 is a through hole passing through the first tested unit 11, and the first tested unit 11 is sleeved on the guide rod 31. The second sliding groove 121 is a through hole passing through the second tested unit 12, and the second tested unit 12 is sleeved on the guide rod 31. The entire outer surface of the guide rod 31 is used as the sliding rail 311, and correspondingly, the first sliding groove 111 is a through hole that penetrates the first unit under test 11. The guide rod 31 can be a rod type such as a round rod or a square rod. The corresponding through hole can be a round hole or a square hole. In this embodiment, the guide rod 31 selects a round rod and the through hole selects a round hole. Be explained. The aperture of the through hole is slightly larger than the outer diameter of the guide rod 31. The guide rod 31 passes through the first sliding groove 111 and the second sliding groove 121, so that the first tested unit 11 and the second tested unit 12 are sleeved on the guide rod 31 Above, the first unit under test 11 and the second unit under test 12 can slide along the guide rod 31. This kind of guiding structure is compact, convenient for installation and later maintenance.

In some alternative embodiments, the length of the guide rod 31 is greater than or equal to the total range of the liquid level gauge 100. Since the first measured unit 11 moves up and down with the rise and fall of the liquid level, the movement distance of the first measured unit 11 on the guide rod 31 will be greater than or equal to the total range of the liquid level gauge 100, in order to make the first measured unit 11 move up and down. Both the measuring unit 11 and the second measured unit 12 can be guided during movement, and the length of the guide rod 31 is set to be greater than or equal to the total range of the liquid level gauge 100.

Referring to FIG. 5, in some alternative embodiments, the guide assembly 30 includes a guide tube 32 arranged in a vertical direction, and the first tested unit 11 and the second tested unit 12 can slide in the guide tube 32. Specifically, the guide assembly 30 includes a guide tube 32 arranged in a vertical direction, that is, the guide tube 32 is arranged perpendicular to the liquid surface. Relatively sliding, the guide tube 32 guides the first measured unit 11 and the second measured unit 12 to move in the vertical direction, so that the movement direction of the first measured unit 11 and the second measured unit 12 is more stable, and the level gauge 100 is improved. The working accuracy and reliability are high.

Further, the guide tube 32 is provided with an inner slide groove 321, the first tested unit 11 is provided with a first slide 112 adapted to the inner slide groove 321, and the second measured unit 12 is provided with an inner slide groove 321. A second sliding block 122 that is compatible. In order to make the movement state of the first unit under test 11 and the second unit under test 12 in the guide tube 32 more stable, not just to maintain the stability of the movement direction, an inner chute 321 is provided in the guide tube 32. 321 extends along the direction in which the guide tube 32 is arranged, that is, the inner sliding groove 321 is arranged in the vertical direction. The first unit under test 11 is provided with a matching first slider 112, the second unit under test 12 is provided with a matching second slider 122, the first unit under test 11, the second unit under test 12 and the inner slide The groove 321 is relatively slidable, so that the movement state of the first tested unit 11 and the second tested unit 12 in the guide tube 32 is kept stable and will not roll in the guide tube 32.

In some alternative embodiments, the length of the guide tube 32 is greater than or equal to the total range of the liquid level gauge 100. Since the first measured unit 11 moves up and down with the rise and fall of the liquid level, the movement distance of the first measured unit 11 in the guide tube 32 will be greater than or equal to the total range of the liquid level gauge 100. Both the measuring unit 11 and the second measured unit 12 can be guided during movement, and the length of the guide tube 32 is set to be greater than or equal to the total range of the liquid level gauge 100.

In some alternative embodiments, the connecting member 13 includes a rigid connecting rope, one end of the rigid connecting rope is connected to the first tested unit 11, and the other end of the rigid connecting rope is connected to the second tested unit 12. Specifically, the connecting member 13 includes a rigid connecting rope. After the first tested unit 11 moves to the first height, the first tested unit 11 pulls the second tested unit 12 to move upward through the connecting member 13, and the rigid connecting rope will not The length changes due to the force, so that the distance between the first unit under test 11 and the second unit under test 12 is kept constant, and the measurement stability of the level gauge 100 is improved.

Please refer to Figures 1-2. In some alternative embodiments, the connecting member 13 includes a connecting rod 131. A top portion 132 is provided near the top of the connecting rod 131, and the second unit under test 12 is fastened to the connecting rod 131. , The first unit under test 11 is arranged between the second unit under test 12 and the top 132, and the first unit under test 11 can slide relative to the connecting rod 131. Specifically, the connecting rod 131 is provided with an abutting top 132 at a position close to the top end, the second tested unit 12 is fixedly connected to the connecting rod 131, and the first tested unit 11 is provided between the second tested unit 12 and the abutting top 132, The first unit under test 11 moves between the second unit under test 12 and the top 132. The abutment portion 132 is provided with a sliding hole 133 adapted to the guide rod 31 so that the connecting member 13 can slide relative to the guide rod 31. When the first unit under test 11 floats against the top 132 following the liquid surface, the first unit under test 11 drives the connecting rod 131 to move upward together, and the second unit under test 12 fixed on the connecting rod 131 follows the connecting rod. 131 moves upward, and the detection device 20 detects the movement of the second measured unit 12 and can also reflect the movement position of the first measured unit 11, that is, it can generate a liquid level measurement signal.

Furthermore, the second unit under test 12 is fastened to the bottom end of the connecting rod 131, and the abutting top 132 is formed by bending the top end of the connecting rod 131. In order to make full use of the length of the connecting rod 131, the second tested unit 12 is fastened to the bottom end of the connecting rod 131, and the top portion 132 is formed by bending the top end of the connecting rod 131, which is convenient for processing and manufacturing.

Please refer to Figure 2 and Figures 6-8. In some alternative embodiments, the detection range of the detection device 20 is 1/N times the total range of the level gauge 100, where N is greater than or equal to 3 Positive integer. The number of measuring components 10 is N-1, the maximum distance between the first measured unit 11 and the second measured unit 12 of the M-th measuring component 10 is M/N times the total range of the level gauge 100, where M ∈[1,N].

In order to increase the total range of the level gauge 100, the technical effect of increasing the total range of the level gauge 100 can be achieved by increasing the number of measurement components 10 without increasing the detection range of the detection device 20. The total range needs to be increased by N times, where N is a positive integer greater than or equal to 2. It is necessary to add N-1 sets of measuring components 10. At the same time, the maximum distance between the first measured unit 11 and the second measured unit 12 of the M-th measuring component 10, that is, the first height of the M-th measuring component 10, is The separation distance between the first unit under test 11 and the second unit under test 12 for linkage.

Please refer to Figures 6-8. For example, when the total range of the level gauge 100 needs to be doubled, that is, the detection range of the detection device 20 is 1/2 times the total range of the level gauge 100. It is necessary to provide a first set of measurement components 10A. The first set of measurement components 10A include a first unit under test 11A, a second unit under test 12A, and a connector 13A. Wherein, the length value of the connecting piece 13A is equal to the first height value. When the first measured unit 11A is raised to the first height, the first measured unit 11A can drive the connecting piece 13A to move upward, that is, drive the first measured unit 13A to move upward. The second unit under test 12A moves upward. After the first tested unit 11A exceeds the detection range of the detection device 20, the second tested unit 12A is still within the detection range of the detection device 20, and the detection device 20 can also detect the movement of the second tested unit 12A to generate liquid Bit measurement signal.

When the total range of the level gauge 100 needs to be increased by 2 times, that is, the detection range of the detection device 20 is 1/3 times of the total range of the level gauge 100. It is necessary to add a second set of measurement components 10B on the basis of the above-mentioned embodiments, and the first height of the second set of measurement components 10B is 2/3 times the total range. That is, the length value of the connecting piece 13B of the second set of measuring assembly 10B is equal to 2/3 times the total range.

Please refer to FIG. 6, when the liquid level is within the detection range of the detection device 20, the first measured unit 11A of the first set of measurement assembly 10A and the first measured unit 11B of the second set of measurement assembly 10B are both in the detection device When the detection range of 20 is within the detection range, the detection device 20 can detect it.

Please refer to FIG. 7, when the liquid level is outside the detection range of the detection device 20, about 1/2 of the total range, the first measured unit 11A of the first set of measurement assembly 10A drives the first set of measurement assembly 10A. The second unit under test 12A moves upward. At this time, the second measured unit 12A of the first set of measurement assembly 10A has not exceeded the detection range, and the level measurement signal can be generated by detecting the second measured unit 12A of the first set of measurement assembly 10A.

Please refer to Figure 8. When the liquid level is at about 2/3 of the total range, the first set of measuring components 10A is outside the detection range, and the first unit under test 11B of the second set of measuring components 10B is also in the detection range. Out of range. The first measured unit 11B of the second set of measuring assembly 10B presses against the connecting piece 13B of the second set of measuring assembly 10B and pushes the connecting piece 13B to float upward, thereby driving the second measured unit 12B provided on the connecting piece 13B to float upwards , The second measured unit 12B is located within the detection range, and the detection device 20 generates a liquid level measurement signal by detecting the second measured unit 12B of the second measurement assembly 10B. By analogy, by adding the number of measurement components 10, the total range is doubled.

Please refer to Figures 1-2. In some alternative embodiments, the first unit under test 11 includes a first magnet, and the second unit under test 12 includes a second magnet. The magnetic force generated by the first magnet and the second magnet The generated magnetism is not equal. Detection device 20 The detection device 20 is arranged by a plurality of Hall sensors 21. In order to facilitate the distinction between the first unit under test 11 and the second unit under test 12, a first magnet is provided in the first unit under test 11, and a first magnet is provided in the second unit under test. The measuring unit 12 is provided with a second magnet, and the magnetic field strength of the first magnet is different from the magnetic field strength of the second magnet. It may be that the magnetic field strength of the first magnet is greater than the magnetic field strength of the second magnet, or the magnetic field strength of the first magnet is smaller than the magnetic field strength of the second magnet.

Further, the detection device 20 includes a plurality of Hall sensors 21, and the plurality of Hall sensors 21 are arranged in a vertical direction. The detection device 20 includes a plurality of Hall sensors 21, and the vertical direction is the direction perpendicular to the liquid surface. When the detection device 20 is arranged perpendicular to the liquid surface, the length of the detection device 20 is the shortest and the detection efficiency is the highest.

In some alternative embodiments, the direction of the magnetic field of the first magnet is opposite to the direction of the magnetic field of the second magnet. In order to prevent the first unit under test 11 and the second unit under test 12 from being attracted together when the liquid level is low, the direction of the magnetic field of the first magnet is set opposite to that of the second magnet.

In some optional embodiments, in order to prevent the first unit under test 11 and the second unit under test 12 from being attracted together when the liquid level is low, the first unit under test 11 and the second unit under test 12 A limit part 14 is provided, and the limit part 14 is used to separate the first unit under test 11 and the second unit under test 12 to prevent the first unit under test 11 and the second unit under test 12 from being attracted to each other. The limit part 14 is made of a non-magnetic material, and can be made of plastic or non-magnetic stainless steel or other materials. The limiting portion 14 can be fixed on the first unit under test 11 or the second unit under test 12 as long as the first unit under test 11 and the second unit under test 12 can be separated.

Further, the limiting portion 14 is a cylinder, the lower end of the limiting portion 14 is connected to the second unit under test 12, and the upper end of the limiting portion 14 extends upward. The limiting portion 14 is cylindrical, the lower end of the limiting portion 14 is fixed on the second tested unit 12, the limiting portion 14 extends upward from the second tested unit 12, and the limiting portion 14 is away from the second tested unit 12 One end is used to press against the first unit under test 11.

In some optional embodiments, the second unit under test 12 includes a float, the float has buoyancy, and the buoyancy generated by the float is less than the gravity of the second unit under test 12. In order to make it easier for the first measured unit 11 to drive the second measured unit 12 to move, a float is provided in the second measured unit 12. The buoyancy generated by the float is less than the gravity of the second measured unit 12, so Make the second unit under test 12 easier to be pulled.

9 is a schematic diagram of the structure of an unmanned aerial vehicle provided by an embodiment of the application; FIG. 10 is a schematic diagram of an exploded structure of FIG. 9; FIG. 11 is a schematic cross-sectional view of FIG. 9.

Please refer to Figure 2 and Figures 9-11. An embodiment of the present application provides a spray assembly (not shown). The spray assembly includes: a water tank 200 for containing liquid, a liquid driving device (not shown), and a spray head assembly (Not shown) and the liquid level gauge 100 provided in the above embodiments, the liquid driving device is in communication with the water tank 200, the spray head assembly is in communication with the liquid driving device, and the level gauge 100 is at least partially disposed in the water tank 200.

The water tank 200 is a container for liquid. The liquid driving device is electrically connected to the controller. The liquid driving device sucks and pressurizes the liquid in the water tank 200, and delivers the liquid to the spray head assembly. The spray head assembly can change the spray pattern and liquid flow rate. Spray pesticides, fertilizers, water and other liquids. The level gauge 100 can improve the spraying accuracy and detect the remaining amount of medicine in time, so as to provide a basis for realizing functions such as reasonable route planning and interruption of the medicine.

Further, the first unit under test 11, the second unit under test 12, the connecting member 13 and the detection device 20 are all arranged in the water tank 200, and the detection device 20 extends from the lowest point of the liquid level along the height direction of the water tank 200. In some embodiments, the detection device 20 is disposed in the water tank 200, and the detection device 20 is powered and communicated wirelessly. The detection device 20 is closer to the measurement assembly 10, and the detection is more accurate and sensitive.

In some alternative embodiments, the first tested unit 11, the second tested unit 12, and the connecting member 13 are provided in the water tank 200, the detection device 20 is provided outside the water tank 200, and the detection device 20 has the lowest liquid level from the liquid. The point extends in the height direction of the water tank 200. The detection device 20 is arranged outside the water tank 200, that is, on the body where the water tank 200 is installed. The detection device 20 can be directly connected to the controller with a wire, which reduces the cost and improves the signal stability. In order to increase the capacity of the water tank 200, the water tank 200 is generally designed to be higher than the fuselage, and the part of the water tank 200 higher than the fuselage is not provided with a detection device 20 at the corresponding position of the fuselage. By providing the measuring assembly 10 in the above-mentioned embodiment, the technical effect of detecting the water tank 200 higher than the body part can be realized.

Please refer to Figures 9-11. An embodiment of the present application provides an unmanned aerial vehicle. The unmanned aerial vehicle includes a central body 310, an arm 320, and a propeller 330. The central body 310 includes the spraying assembly provided in the foregoing embodiment. One end is connected to the central body 310, and the other end of the arm 320 is connected to the propeller 330.

Specifically, the water tank 200 is installed on the central body 310, and the water tank 200 contains pesticides, fertilizers, water and other liquids required for spraying. A plurality of machine arms 320 are arranged extending outward from the central body 310. The plurality of machine arms 320 are centered on the central body 310, and the plurality of machine arms 320 are evenly distributed along the circumferential direction of the yaw axis. Propellers 330 are arranged on the machine arms 320.

Further, the central body 310 includes a housing 311, the housing 311 is provided with an installation position 312 for installing the water tank 200, and the detection device 20 is provided on the housing 311. The housing 311 of the center body 310 is provided with a mounting position 312 to load the water tank 200, and the mounting position 312 is used to install a fixed water tank 200 to prevent the water tank 200 from moving during the movement of the UAV. The mounting position 312 can be a fixed bracket or a fixed slot. The embodiment takes the fixing bracket as an example. The fixing bracket includes a plurality of fixing rods, one end of the fixing rod is fixed to the housing 311 by a screw, and the other end of the fixing rod is fixed to the water tank 200 by a screw.

In some alternative embodiments, the installation position 312 includes an installation groove 313 whose shape matches the shape of the water tank 200, and the detection device 20 is provided on the groove wall of the installation groove 313. Specifically, the shape of the installation groove 313 is adapted to the shape of the water tank 200, the installation groove 313 is provided on the top of the housing 311, the water tank 200 can be directly put into the installation groove 313 from above the housing 311, and the detection device 20 is provided in the installation groove On the tank wall of 313, when the water tank 200 is put into the installation tank 313, the detection device 20 automatically reaches the working position, and the level gauge 100 can perform the measurement normally.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the application, not to limit it; although the application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or equivalently replace some or all of the technical features; these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present application. Scope.

Claims

A liquid level gauge, which is characterized in that it comprises:

The measuring assembly includes a first measured unit that can float in liquid, a second measured unit that can sink in the liquid, and a connecting piece; the connecting piece is configured to flexibly connect the first measured unit and the second measured unit A unit under test, and after the first unit under test rises to a first height in the liquid, the first unit under test can drive the second unit under test to float up through the connecting piece;

A detection device configured to detect the position of at least one of the first unit under test and the second unit under test, and generate a liquid level measurement signal based on the detected position information.
The liquid level gauge according to claim 1, wherein the first height is less than or equal to the detection range of the detection device.
The liquid level gauge according to claim 2, wherein the detection device is arranged in a vertical direction and the bottom of the detection device is flush with the lowest point of the liquid surface.
The level gauge according to claim 2, wherein the preset total range of the level gauge is equal to twice the detection range of the detection device, and the first height is equal to the detection range of the detection device. Range, the length of the connecting piece between the first unit under test and the second unit under test is equal to the first height.
The liquid level gauge according to any one of claims 1 to 4, wherein the liquid level gauge further comprises a guide assembly, and the guide assembly is used to guide the first unit to be measured and the second unit to be measured The direction of movement of the unit.
The liquid level gauge according to claim 5, wherein the guide assembly comprises a guide rod arranged in a vertical direction, and the first unit to be measured and the second unit to be measured are slidable relative to the guide rod .
The liquid level gauge according to claim 6, wherein the guide rod is provided with a slide rail, the first measured unit is provided with a first slide groove adapted to the slide rail, and the first The two tested units are provided with a second sliding groove adapted to the sliding rail.
The liquid level gauge according to claim 7, wherein the slide rail is provided on the outer surface of the guide rod;

The first sliding groove is a through hole passing through the first tested unit, and the first tested unit is sleeved on the guide rod;

The second sliding groove is a through hole passing through the second tested unit, and the second tested unit is sleeved on the guide rod.
The liquid level gauge according to claim 6, wherein the length of the guide rod is greater than or equal to the total range of the liquid level gauge.
The liquid level gauge according to claim 5, wherein the guide assembly comprises a guide tube arranged in a vertical direction, and the first unit to be measured and the second unit to be measured are slidable in the guide tube.
The liquid level gauge according to claim 10, wherein the guide tube is provided with an inner slide groove, and the first measured unit is provided with a first sliding block adapted to the inner slide groove, and The second tested unit is provided with a second sliding block adapted to the inner sliding groove.
The liquid level gauge according to claim 10, wherein the length of the guide tube is greater than or equal to the total range of the liquid level gauge.
The level gauge according to any one of claims 1 to 4, wherein the connecting member comprises a rigid connecting rope, one end of the rigid connecting rope is connected to the first measured unit, and the rigid connecting The other end of the rope is connected with the second unit under test.
The liquid level gauge according to any one of claims 1 to 4, wherein the connecting piece comprises a connecting rod, and a position of the connecting rod near the top end is provided with an abutting top; the second measured unit is fastened On the connecting rod; the first unit to be tested is arranged between the second unit to be tested and the top portion, and the first unit to be tested can slide relative to the connecting rod.
The liquid level gauge according to claim 14, wherein the second measured unit is fastened to the bottom end of the connecting rod, and the abutting top part is formed by bending the top end of the connecting rod.
The level gauge according to any one of claims 1-4, wherein the detection range of the detection device is 1/N times the total range of the level gauge, wherein N is greater than or equal to 3 Positive integer;

The number of the measuring components is N-1, and the maximum distance between the first measured unit and the second measured unit of the M-th measuring component is M/N times the total range of the level gauge, where M∈ [1, N].
The liquid level gauge according to any one of claims 1 to 4, wherein the first measured unit includes a first magnet, the second measured unit includes a second magnet, and the first magnet The generated magnetic force is not equal to the magnetic force generated by the second magnet.
The liquid level gauge according to claim 17, wherein the detection device comprises a plurality of Hall sensors, and the plurality of Hall sensors are arranged in a vertical direction.
The liquid level gauge according to claim 17, wherein the direction of the magnetic field of the first magnet is opposite to the direction of the magnetic field of the second magnet.
The liquid level gauge according to claim 17, wherein a limit part is provided between the first measured unit and the second measured unit, and the limit part is used to separate the first The unit under test and the second unit under test prevent the first unit under test and the second unit under test from being attracted to each other.
The level gauge according to claim 20, wherein the limiting portion is a cylinder, the lower end of the limiting portion is connected to the second measured unit, and the upper end of the limiting portion extends upward .
The liquid level gauge according to claim 1, wherein the second measured unit comprises a float, the float has buoyancy, and the buoyancy generated by the float is less than the gravity of the second measured unit .
A spray assembly, characterized in that the spray assembly comprises a water tank for containing liquid, a liquid drive device, a spray head assembly, and the liquid level gauge according to any one of claims 1-22, and the liquid drive device In communication with the water tank, the spray head assembly is in communication with the liquid driving device, and the liquid level gauge is at least partially arranged in the water tank.
The spray assembly of claim 23, wherein the first unit to be tested, the second unit to be tested, the connecting piece, and the detection device are all provided in the water tank, and the detection The device extends from the lowest point of the liquid level in the height direction of the water tank.
The spray assembly of claim 23, wherein the first unit to be tested, the second unit to be tested, and the connecting member are provided in the water tank, and the detection device is provided in the water tank In addition, the detection device extends from the lowest point of the liquid level of the liquid along the height direction of the water tank.
An unmanned aerial vehicle, characterized by comprising a central body, an arm and a propeller, the central body comprising the spray assembly according to any one of claims 23 to 25, and one end of the arm and the center The other end of the arm is connected with the propeller.
The unmanned aerial vehicle according to claim 26, wherein the central body comprises a housing, the housing is provided with an installation position for installing the water tank, and the detection device is provided on the housing.
The unmanned aerial vehicle according to claim 27, wherein the installation position comprises an installation groove, the shape of the installation groove is adapted to the shape of the water tank, and the detection device is provided in the installation groove. Groove wall.