Valve, spraying device and unmanned aerial vehicle

Abstract

The utility model provides a valve, a spraying device and an unmanned aerial vehicle, relates to the technical field of aircrafts, and solves the technical problems that the valve consumes electricity and is high in water pressure loss during normal work. The valve comprises a valve body, a valve element assembly and a valve deck matched with the valve body, the valve body is provided with a first valve cavity and a second valve cavity, the valve deck is provided with a containing cavity for containing the valve element assembly, and the first valve cavity is communicated with the containing cavity through a first opening, and the second valve cavity is communicated with the containing cavity through a second opening. The valve element assembly comprises a valve clack, an elastic piece and two suction pieces, one end of the elastic piece abuts against the bottom wall of the containing cavity, the other end of the elastic piece plugs the valve clack at the first opening through elastic force, one of the two suction pieces is fixedly arranged on the bottom wall, and the other suction piece is connected to the valve clack. The valve does not need external power supply, saves electricity and is low in water pressure loss during normal work.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, and in particular to a valve, a spraying device and a drone. Background Art

[0002] The application of agricultural plant protection drones is increasing. As an important component of the pesticide spraying device, the valve controls the on-off of the liquid. If the valve is not installed, the liquid will leak along the nozzle under the liquid pressure.

[0003] The valves in the related technology are expensive to produce and use. For example, the solenoid valve needs to be powered to work, which consumes the power of the drone. Utility Model Content

[0004] The utility model aims to provide a valve, a spraying device and a UAV, so as to solve the technical problem of high cost of using valves in the UAV spraying system.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] In a first aspect, the utility model provides a valve, comprising a valve body, a valve core assembly and a valve cover matched with the valve body, wherein the valve body has a first valve cavity and a second valve cavity, and the valve cover has an accommodating cavity for accommodating the valve core assembly, wherein the first valve cavity is communicated with the accommodating cavity through a first opening, and the second valve cavity is communicated with the accommodating cavity through a second opening;

[0007] The valve core assembly includes a valve flap, an elastic member and two suction members, one end of the elastic member abuts against the bottom wall of the accommodating cavity, and the other end seals the valve flap at the first opening through elastic force, one of the two suction members is fixed on the bottom wall, and the other is connected to the valve flap.

[0008] According to at least one embodiment of the present utility model, the valve core assembly also includes a push portion, which includes a push plate and a first protrusion protruding from the push plate, the push plate is attached to the valve disc, at least part of the elastic member is sleeved on the first protrusion, and a suction member is arranged in the first protrusion.

[0009] According to at least one embodiment of the utility model, the pushing portion also includes a sleeve formed on the pushing plate and arranged in an annular manner outside the elastic member, the sleeve is slidably arranged in a sliding cavity of the accommodating cavity, and one end of the elastic member facing away from the pushing plate abuts against the bottom wall of the sliding cavity.

[0010] According to at least one embodiment of the present utility model, the accommodating cavity further has a second protruding portion, which is formed on the bottom wall of the accommodating cavity and protrudes toward the direction of the first protruding portion;

[0011] At least a portion of the elastic member is sleeved on the second protruding portion, and another of the suction members is disposed in the second protruding portion.

[0012] According to at least one embodiment of the present utility model, the position of the suction member on the second protruding portion is adjustable along the protruding direction of the second protruding portion.

[0013] According to at least one embodiment of the present utility model, the valve core assembly further comprises a deformation portion connected to the outer peripheral side of the valve disc, and a circumferential edge portion of the deformation portion is fixed between the valve cover and the valve body.

[0014] According to at least one embodiment of the present utility model, the cross-sectional shape of the deformation portion includes at least one curved section for facilitating deformation.

[0015] According to at least one embodiment of the present utility model, the valve cover further has a through hole formed on the wall surface, and a portion of the accommodating cavity located on a side of the valve flap away from the first opening is connected to the external environment through the through hole.

[0016] According to at least one embodiment of the present utility model, the valve body comprises a cylindrical shell, and the shell has a third opening that cooperates with the valve cover;

[0017] The valve body further comprises a connecting pipe located on the inner side of the bottom wall of the shell, wherein the inner peripheral side of the end of the connecting pipe close to the third opening forms the first opening; and the outer peripheral side of the end of the connecting pipe close to the third opening and the shell form the second opening;

[0018] The valve body further includes two water pipes, one of the two water pipes passes through the shell and is communicated with the communicating pipe, and the other water pipe is communicated with the inside of the shell.

[0019] In a second aspect, the utility model provides a spraying device, comprising the valve described in the first aspect.

[0020] In a third aspect, the utility model provides a drone, comprising the spraying device described in the second aspect.

[0021] Among the one or more technical solutions provided in the exemplary embodiments of the present utility model, at least one of the following beneficial effects can be achieved.

[0022] When the water pressure entering the first valve cavity or the second valve cavity of the valve of the exemplary embodiment of the utility model is greater than the pressure of the elastic member, the water pressure pushes the valve flap to separate from the first opening, and the first valve cavity and the second valve cavity are connected through the accommodating cavity; when the water pressure pumped into the valve body is less than the pressure of the elastic member, the valve flap is restored and blocked on the first opening under the action of the elastic force of the elastic member, thereby disconnecting the first valve cavity and the second valve cavity. Compared with the solenoid valve in the prior art, the valve of the exemplary embodiment of the utility model does not require external power supply, and the valve can be opened and closed by the pumped water pressure, saving electricity.

[0023] Furthermore, when the valve is in a connected state, the elastic force of the elastic member changes linearly with the distance of compression, and the two suction members will decrease with the compression distance of the elastic member, and the magnetic attraction of the suction member has the characteristic of exponentially increasing with the reduction of distance. Based on this, when the valve is opened by the initial water pressure, the water pressure in its working state is lower than the initial water pressure, which means that the water pressure loss in the working state of the valve can be reduced, the water output is large, and it is suitable for low-pressure spraying systems, thereby saving the power of the water pump and reducing the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings illustrate exemplary embodiments of the present invention and are used to explain the principles of the present invention together with the description thereof, wherein these drawings are included to provide a further understanding of the present invention, and the accompanying drawings are included in and constitute a part of this specification;

[0025] Figure 1 It is a schematic diagram of the isometric structure of the valve and the hose according to the embodiment of the utility model;

[0026] Figure 2 It is a schematic diagram of a three-dimensional exploded structure of a valve and a hose according to an embodiment of the utility model;

[0027] Figure 3 It is a schematic diagram of the axonometric structure of a valve body according to an embodiment of the utility model;

[0028] Figure 4 It is a schematic diagram of the longitudinal cross-sectional structure of the valve (closed state) according to the embodiment of the utility model;

[0029] Figure 5 It is a schematic diagram of the longitudinal cross-sectional structure of the valve (open state) according to an embodiment of the utility model.

[0030] Figure numerals: 10, valve body; 11, water pipe; 111, second valve cavity; 112, second opening; 12, connecting pipe; 121, first valve cavity; 122, first opening; 13, shell; 21, valve flap; 211, deformation part; 22, suction part; 23, push part; 231, push plate; 232, sleeve; 233, first protrusion; 24, elastic part; 30, valve cover; 31, accommodating cavity; 32, sliding cavity; 33, through hole; 34, second protrusion; 40, hose; 41, clamp. DETAILED DESCRIPTION

[0031] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0032] The application of agricultural plant protection machines that spray pesticides in drones is constantly developing, and the valves in their spraying systems control the on and off of pesticides. If the valves are not installed, the liquid will leak along the nozzle under the liquid pressure. In related technologies, the valves in the spraying system are solenoid valves, which need to be powered when working, consuming the power of the drone. At the same time, the solenoid valves are prone to burn out when working for a long time or the voltage is unstable, and the replacement and maintenance costs are high.

[0033] In response to the above problems, the valve provided by the exemplary embodiment of the utility model utilizes hydraulic pressure to open the valve, thereby saving electricity. It utilizes the characteristics that the spring pressure changes linearly with the compression distance, and the suction force of the suction piece increases exponentially with the reduction of the distance. This makes the water pressure when the valve is in the working state lower than the initial working water pressure, thereby reducing water pressure loss, saving electricity, and keeping costs low.

[0034] It should be noted that the valve of the utility model can be used in a spraying system, and can also be used to open and close other liquid or gas pipelines. The spraying system including the valve can be used in drones, and can also be applied to light and ultralight aircraft, light helicopters, gliders, delta wings, powered delta wings, paragliders, powered parachutes, hot air balloons, airships, aviation models, and aerospace models.

[0035] Figure 2 It is a schematic diagram of a three-dimensional exploded structure of a valve and a hose according to an embodiment of the utility model; Figure 5 Schematic diagram of the longitudinal cross-sectional structure of the valve (open state) according to the embodiment of the present utility model. Figure 2 and Figure 5As shown, the valve provided by the exemplary embodiment of the utility model includes a valve body 10, a valve core assembly and a valve cover 30 matched with the valve body 10, the valve body 10 has a first valve cavity 121 and a second valve cavity 111, the valve cover 30 has an accommodating cavity 31 for accommodating the valve core assembly, the first valve cavity 121 is connected to the accommodating cavity 31 through a first opening 122, and the second valve cavity 111 is connected to the accommodating cavity 31 through a second opening 112; the valve core assembly includes a valve flap 21, an elastic member 24 and two suction members 22, one end of the elastic member 24 abuts against the bottom wall of the accommodating cavity 31, and the other end blocks the valve flap 21 at the first opening 122 through elastic force, one of the two suction members 22 is fixedly arranged on the bottom wall of the accommodating cavity 31, and the other is connected to the valve flap 21.

[0036] It should be noted that the two suction members 22 may be two magnets with opposite polarities, one of the two suction members 22 may be a magnet, and the other may be a ferromagnetic metal sheet, and the following description will be made by taking the two suction members 22 as magnets as an example. It should also be noted that one of the two suction members 22 is connected to the valve flap 21, and may be directly connected to the valve flap 21, or indirectly connected to the valve flap 21 through a medium, for example, the suction member 22 is disposed on the push portion 23, and the push portion 23 is connected to the valve flap 21.

[0037] In practical applications, when the valve is in the closed state, Figure 4 As shown, Figure 4 1 is a schematic diagram of a longitudinal cross-sectional structure of a valve (closed state) according to an embodiment of the present invention. In the closed state, the valve flap 21 is blocked on the first opening 122 under the elastic force of the elastic member 24. At this time, the first valve cavity 121 is not connected to the accommodating cavity 31, that is, the first valve cavity 121 is not connected to the second valve cavity 111, and the water flow cannot enter the second valve cavity 111 from the first valve cavity 121; when the water pressure in the first valve cavity 121 continues to increase, when the water pressure is greater than the elastic force of the elastic member 24, the valve flap 21 moves downward, thereby opening the first opening 122. At this time, the first valve cavity 121 is connected to the second valve cavity 111 through the accommodating cavity 31 to form a passage, as shown in FIG. Figure 5 As shown, water flows from the first opening 122 into the accommodating chamber 31 and from the second opening 112 into the second valve chamber 111, and the valve is in an open working state. In the process of the elastic member 24 being continuously compressed, the elastic force of the elastic member 24 increases linearly as the compression distance shortens, and the two suction members 22 shorten as the distance of the valve flap 21 descends, and the suction force of the two increases exponentially as the compression distance shortens. Therefore, the water pressure of the valve in the working state can be lower than the water pressure during the initial working state, and the water pressure loss of the valve when connected is small, thereby increasing the flow rate, saving the power of the water pump, and reducing the cost. At the same time, compared with the solenoid valve, the valve provided by the exemplary embodiment of the utility model does not require an additional power supply device to work, saving electricity.

[0038] Exemplarily, the elastic member 24 may be a spring, or a rubber column or rubber sleeve with a certain elastic modulus. One suction member 22 may be fixedly disposed on the bottom wall of the accommodating cavity 31 , and another suction member 22 may be indirectly connected to the valve flap 21 through a pushing portion 23 .

[0039] like Figure 4 and Figure 5 As shown, the water flow direction of the valve provided by the exemplary embodiment of the utility model is from the first valve cavity 121 to the second valve cavity 111. In some embodiments, the water flow direction of the valve is from the second valve cavity 111 to the first valve cavity 121, and the same valve opening and closing effect can also be achieved, that is, when the valve is installed on the corresponding pipeline, the positive and negative directions of the water flow can be not distinguished.

[0040] The elastic member 24 may be directly connected to the valve flap 21, or may be indirectly connected to the valve flap 21 through other components, such as Figure 2 and Figure 5 As shown, Figure 2 The valve core assembly further includes a push portion 23, which includes a push plate 231 and a first protrusion 233 protruding from the push plate 231. The push plate 231 is attached to the valve flap 21, at least part of the elastic member 24 is sleeved on the first protrusion 233, and a suction member 22 is disposed in the first protrusion 233.

[0041] When a part of the elastic member 24 is sleeved on the first protrusion 233, the end of the elastic member 24 stops at the side of the push plate 231 away from the valve disc 21, and the first protrusion 233 plays a role in positioning and fixing the elastic member 24. The first protrusion 233 can be a hollow cylindrical structure, and a suction member 22 can be fixed inside the cavity of the cylindrical structure by glue, etc. At this time, the suction member 22 is indirectly connected to one end of the elastic member 24. Exemplarily, the push plate 231 and the valve disc 21 can be bonded by glue. When the valve disc 21 is made of rubber or plastic, a receiving groove can also be set on the valve disc 21, and the circumferential edge of the push plate 231 is covered in the receiving groove.

[0042] Considering the stability of the valve flap 21 during movement, the valve flap 21 is exactly opposite to the first opening 122. Exemplarily, the push portion 23 further includes a sleeve 232 formed on the push plate 231 and arranged outside the elastic member 24. The sleeve 232 is slidably arranged in the sliding cavity 32 of the accommodating cavity 31, and one end of the elastic member 24 away from the push plate 231 abuts against the bottom wall of the sliding cavity 32.

[0043] Exemplarily, the sleeve 232 is cylindrical, and the first protrusion 233 is also cylindrical, and the annular space formed between the two can accommodate a portion of the elastic member 24. As a part of the accommodating cavity 31, the shape and size of the sliding cavity 32 match the shape and size of the sleeve 232, and the two form a guiding structure, so that when the valve flap 21 returns to the position of the first opening 122 during the reciprocating motion, it can accurately and completely block the first opening 122 without deviating from the position of the first opening 122.

[0044] In order to position the end of the elastic member 24 away from the valve flap 21, as shown in FIG. Figure 4 As shown, the second protrusion 34 is formed on the bottom wall of the accommodating cavity 31, is located in the accommodating cavity 31, and protrudes toward the direction of the first protrusion 233, that is, the valve cover 30 has a second protrusion 34; at least part of the elastic member 24 is sleeved on the second protrusion 34, and another suction member 22 is arranged in the second protrusion 34.

[0045] It should be noted that the second protrusion 34 on the bottom wall of the accommodating cavity 31 is actually the second protrusion 34 formed on the valve cover 30 and protruding inward, and the second protrusion 34 is opposite to the first protrusion 233. The second protrusion 34 can also be cylindrical, having a hollow cavity, and another suction member 22 is arranged in the cavity. Along the protruding direction of the second protrusion 34, the position of the other suction member 22 on the second protrusion 34 is adjustable, and the connection method of the other suction member 22 and the second protrusion 34 can also be glue bonding. Therefore, the distance between the two suction members 22 can be adjusted according to actual needs, and then the water output of the valve can be controlled by the difference in distance.

[0046] Considering that the liquid medicine entering the accommodating chamber 31 may corrode the push portion 23 and affect the sliding process between the sleeve 232 and the sliding chamber 32, for example, solid matter and scale in the liquid medicine may fill the gap between the two, causing uneven sliding. Figure 4 and Figure 5 As shown, the valve core assembly further includes a deformation portion 211 connected to the outer peripheral side of the valve flap 21 , the circumferential edge of the deformation portion 211 is fixed between the valve cover 30 and the valve body 10 , and the valve flap 21 is connected to the elastic member 24 .

[0047] Exemplarily, the deformation portion 211 is an annular component, and its cross-sectional shape may include at least one bending segment that is convenient for deformation. The bending segment may be an arc-shaped bending segment, a rectangular bending segment, or a bending segment of other shapes that are easy to deform, which are not listed one by one here. For example, the cross-section of the deformation portion 211 is shaped as one or more serpentine bends, which extend in a direction away from the valve flap 21. When the circumferential edge of the deformation portion 211 is fixed between the valve cover 30 and the valve body 10, a bent groove is also provided between the valve cover 30 and the valve body 10 to cooperate with the circumferential edge of the deformation portion 211, thereby forming a sealing effect. The portion of the deformation portion 211 excluding the circumferential edge, that is, the serpentine bend in the middle portion, can be deformed, stretched or retracted, so that the valve flap 21 can move freely up and down under the action of water pressure, and the accommodating chamber 31 on the side of the valve flap 21 away from the first opening 122 is always isolated from the accommodating chamber 31 on the side of the valve flap 21 toward the first opening 122, thereby preventing the entry of liquid medicine and affecting the normal operation of the valve core assembly.

[0048] For example, the deformation part 211 can be made of plastic or rubber; the valve flap 21 can be made of plastic or rubber; when the deformation part 211 and the valve flap 21 are made of the same material, the valve flap 21 and the deformation part 211 can be integrally formed, and the stability is high. When the valve flap 21 is made of soft plastic or rubber, its sealing effect on the first opening 122 is better than that of a rigid material.

[0049] When the valve flap 21 has the deformable portion 211, the deformable portion 211 divides the accommodating cavity where the valve core assembly is located into a relatively closed space, such as Figure 4 and Figure 5 As shown, the valve cover 30 also has a through hole 33 formed on the wall surface, and the portion of the accommodating cavity 31 located on the side of the valve flap 21 away from the first opening 122 is connected to the external environment through the through hole 33. The provision of the through hole 33 can prevent the valve from affecting the internal pressure of the valve due to changes in temperature and altitude, thereby preventing the problem of unstable operation from occurring.

[0050] Figure 3 Schematic diagram of the isometric structure of the valve body according to the embodiment of the utility model. Figure 3 He Ru Figure 4As shown, in the valve provided by the exemplary embodiment of the utility model, the valve body 10 includes a cylindrical shell 13, and the shell 13 has a third opening that cooperates with the valve cover 30; the valve body 10 also includes a connecting pipe 12 located on the inner side of the bottom wall of the shell 13, and the inner peripheral side of the end of the connecting pipe 12 close to the third opening forms a first opening 122; the outer peripheral side of the end of the connecting pipe 12 close to the third opening forms a second opening 112 between the shell 13 and the outer peripheral side; the valve body 10 also includes two water pipes 11, one of the two water pipes 11 passes through the shell 13 and is connected to the connecting pipe 12, and the other water pipe 11 is connected to the shell 13.

[0051] In practical applications, the second opening 112 is an annular opening, which surrounds the outside of the first opening 122, and the connecting pipe 12 separates the two. One water pipe 11 passes through the cylindrical shell 13 and communicates with the connecting pipe 12, that is, it is connected to the first valve cavity 121; the other water pipe is connected to the cavity between the connecting pipe 12 and the shell 13, that is, it is connected to the second valve cavity 111. It can be understood that the shape and size of the valve flap 21 match the first opening 122, or are larger than the size of the first opening 122 so that the first opening 122 can be blocked. Exemplarily, one of the two water pipes 11 can be water inlet, and the other can be water outlet, and they can be used interchangeably. It can be understood that the shell 13 has a third opening that cooperates with the valve cover 30, and the cooperation between the two can be a threaded connection, and the peripheral edge of the corresponding deformation portion 211 is clamped in the third opening between the shell 13 and the valve cover 30.

[0052] For example, the valve body 10, valve cover 30, and push part 23 are all made of plastic injection molding, and the metal parts are standard parts. The overall cost is less than 10 yuan, which is much lower than the cost of tens of yuan of solenoid valves, which is beneficial to agricultural production and replacement. Compared with electromagnetic coils, since there is no coil, ferrite or other metal, it is light in weight and easy to use on drones; it also has the advantages of simple structure and easy maintenance and replacement.

[0053] Figure 1 Schematic diagram of the isometric structure of the valve and hose according to the embodiment of the utility model. Figure 1 and Figure 2 As shown, the valve provided by the exemplary embodiment of the utility model further includes two hoses 40 , and the two hoses 40 are fixedly connected to the two water pipes 11 of the valve through clamps 41 , respectively.

[0054] In order to further illustrate the working principle of the valve, a calculation process is given as an example below.

[0055] The valve design requirements for the agricultural spraying system of drones include: (1) The valve must ensure that no liquid drops when the drone is stationary or in flight; (2) There should not be excessive water pressure loss when the fluid passes through the valve; (3) The valve should automatically close when the water pump stops.

[0056] The given parameters of the drone include: (1) the height difference between the drone's water tank and the end spray is less than 1.2m, the fluid pressure difference is 1.2m, and the converted pressure is 0.012Mpa; (2) the maximum head of the water pump is 13m, the converted pressure is 0.13Mpa, and the maximum flow rate is 24L per minute; (3) the maximum working flow rate of the spray disc is 12L per minute; (4) the instantaneous acceleration of the drone is 0.5g.

[0057] 1) When the water pump spraying does not work:

[0058] The valve disc 21 is Figure 4 The hydrostatic pressure P 静 =1.2m water pressure*(1g+0.5g)=0.018Mpa (the value of the drone acceleration process);

[0059] Hydrostatic pressure F of valve disc 21 静水 = hydrostatic pressure * force area = P 静水 *S1=0.018Mpa*(Π*R 2 )≈1.4N; R is 5mm, S1 is the cross-sectional area of ​​the connecting pipe 12;

[0060] Preload force required for valve disc 21 sealing deformation: F 预紧 ≈0.8N;

[0061] F 磁吸 =(B1*B2*A) / (2μ0*d 2 ),

[0062] where F 磁吸 is the suction force, B1 and B2 are the magnetic induction intensities of the two magnets, A is the contact area of ​​the two magnets, d is the distance between the two magnets, and μ0 is the vacuum magnetic permeability; specifically, when the valve is closed, d = 3.6 mm, F 3.6磁吸 ≈0.7N;

[0063] Spring force F 弹 = kx,

[0064] Where k is the elastic coefficient, x is the deformation; k = 1000 N / m; pre-compression x = 3 mm;

[0065] When the valve is closed, F 弹 =3N≥F 静水 +F 预紧 +F3.6磁吸 =2.9N; thus the valve can ensure sealing and prevent liquid from dripping.

[0066] 2) When the water pump starts spraying:

[0067] F 初始 =F 弹 -F 3.6磁吸 =2.3N;

[0068] P 初始 =F 初始 / S1=2.3N / 0.0000785㎡≈0.03Mpa, which is converted into a water column height of 3 meters;

[0069] The maximum head of the water pump is 13 meters, and the maximum pressure is 0.13Mpa>0.03Mpa. The initial water pump needs to provide 3m water pressure power to meet the starting requirements.

[0070] 3) When the water pump sprays continuously:

[0071] The water pump continues to supply water, and the valve disc 21 moves to Figure 5 In the position shown, the distance between the two suction members 22 changes from d=3.6 mm to d=1.6 mm, shortened by 2 mm;

[0072] F 3.6磁吸 / F 1.6磁吸 =1.62 / 3.62;

[0073] F 1.6磁吸 =(3.62 / 1.62)*F 3.6磁吸 ≈3.54N;

[0074] At this time, the spring pressure is F 弹 =k*(X 预压 +X 工作 )=1000N / m*(0.003m+0.002m)=5N;

[0075] The pressure F of water on the valve disc 21 (4工作) =5N-3.54N=1.46N;

[0076] Water pressure is P (水工作) =F (4工作) / S1≈0.0186Mpa, the converted water column pressure is about 1.86m;

[0077] The water pressure during operation is 1.86m<initial working water pressure 3m, so the water pressure required for the valve to operate is smaller.

[0078] 4) When the water pump stops spraying:

[0079] The distance between the two magnets is 3.6 mm, F 3.6磁吸 ≈3.54N; the spring pressure at this time is F 弹 =5N;

[0080] Hydrostatic pressure 1.2m (including interference) + water pressure generated by the acceleration of the drone, F 静水 ≈1.4N;

[0081] F 弹 =5N>F 3.6磁吸 +F 静水 =4.94N, the elastic force of the spring is greater, and the valve disc 21 is driven by the spring to return to the position as shown in FIG. Figure 4 Position shown.

[0082] As can be seen from the above, the valve of the exemplary embodiment of the utility model is applied in the spraying system of the drone, which can meet the requirements that there should be no excessive water pressure loss when the valve is working, the valve automatically closes when the water pump stops, and there is no liquid dripping when the drone is stationary or flying. The maximum flow rate of the valve can reach 16L per minute, the water output is large, and the pressure loss of the liquid is small, which is suitable for low-pressure spraying systems. Furthermore, since the liquid does not need to pass through tiny holes, but through the first opening 122 and the second opening 112, the valve can pass 1.5mm particles, or 4mm flake scale or pesticide residues, and is not easy to clog.

[0083] The exemplary embodiment of the present utility model further provides a spraying device, comprising the valve in the above embodiment.

[0084] An exemplary embodiment of the utility model further provides a drone, comprising the spraying device in the above embodiment.

[0085] Compared with the prior art, the advantages of the spraying device and the drone of the exemplary embodiment of the utility model are the same as those of the above-mentioned valve, which will not be repeated here.

[0086] Those skilled in the art should understand that the above embodiments are only for the purpose of clearly illustrating the present invention, and are not intended to limit the scope of the present invention. For those skilled in the art, other changes or modifications may be made based on the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A valve, characterized in that: The invention comprises a valve body, a valve core assembly and a valve cover matched with the valve body, wherein the valve body has a first valve cavity and a second valve cavity, the valve cover has an accommodating cavity for accommodating the valve core assembly, the first valve cavity is communicated with the accommodating cavity through a first opening, and the second valve cavity is communicated with the accommodating cavity through a second opening respectively; The valve core assembly includes a valve flap, an elastic member and two suction members, one end of the elastic member abuts against the bottom wall of the accommodating cavity, and the other end seals the valve flap at the first opening through elastic force, one of the two suction members is fixed on the bottom wall, and the other is connected to the valve flap.

2. The valve according to claim 1, characterized in that: The valve core assembly further comprises a push portion, the push portion comprising a push plate and a first protrusion protruding from the push plate, the push plate is attached to the valve flap, at least part of the elastic member is sleeved on the first protrusion, and one of the suction members is disposed in the first protrusion; A second protrusion is formed on the bottom wall of the accommodating cavity, and the second protrusion protrudes toward the direction of the first protrusion; At least a portion of the elastic member is sleeved on the second protruding portion, and another of the suction members is disposed in the second protruding portion.

3. The valve according to claim 2, characterized in that: The pushing portion further comprises a sleeve formed on the pushing plate and arranged around the elastic member, the sleeve is slidably arranged in a sliding cavity of the accommodating cavity, and one end of the elastic member away from the pushing plate abuts against a bottom wall of the sliding cavity.

4. The valve according to claim 3, characterized in that: Along the protruding direction of the second protruding portion, the position of the suction member on the second protruding portion is adjustable.

5. The valve according to any one of claims 1 to 4, characterized in that: The valve core assembly further comprises a deformation portion connected to the outer peripheral side of the valve disc, and a peripheral edge portion of the deformation portion is fixed between the valve cover and the valve body.

6. The valve according to claim 5, characterized in that The cross-sectional shape of the deformation portion includes at least one curved section for facilitating deformation.

7. The valve according to claim 5, characterized in that The valve cover also has a through hole formed on the wall surface, and a portion of the accommodating cavity located on a side of the valve flap away from the first opening is communicated with the external environment through the through hole.

8. The valve according to claim 5, characterized in that The valve body comprises a cylindrical shell, and the shell has a third opening matched with the valve cover; The valve body further comprises a connecting pipe located on the inner side of the bottom wall of the shell, wherein the inner peripheral side of the end of the connecting pipe close to the third opening forms the first opening; and the outer peripheral side of the end of the connecting pipe close to the third opening and the shell form the second opening; The valve body further includes two water pipes, one of the two water pipes passes through the shell and is communicated with the communicating pipe, and the other water pipe is communicated with the inside of the shell.

9. A spraying device, characterized in that: A valve comprising the valve according to any one of claims 1 to 8.

10. A drone, characterized in that: Comprising the spraying device as claimed in claim 9.

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