Aircraft spraying device

Abstract

The present invention provides a spraying device for an aircraft, comprising: a box arranged on the aircraft body and storing liquid; a first pipeline, a first medium pump for pumping liquid installed in the first pipeline; a first nozzle connected to the first pipeline; a one-way valve installed between the first medium pump and the first nozzle, the one-way valve opens when the first medium pump pumps liquid to allow liquid to pass through and flow to the first nozzle, and closes when the first medium pump stops pumping liquid to prevent liquid from passing through and flowing to the first nozzle, the sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle is greater than the target height liquid column pressure, and the target height liquid column pressure is greater than or equal to the liquid column pressure between the one-way valve and the first nozzle. The present invention solves the problem in the prior art that the pressure nozzle cannot be opened because of the presence of gas in the pressure nozzle by setting an anti-drip valve in the pressure nozzle, and the automatic exhaust needs to be realized by adding a solenoid valve, resulting in a relatively complex pipeline structure and a relatively large pipeline structure.

Description

Technical Field

[0001] The invention relates to the technical field of aircraft spraying, and in particular to a spraying device for an aircraft. Background Art

[0002] A drone is a remotely controlled or autonomously flying aircraft, consisting of an aircraft and a control station. The aircraft system includes the fuselage, power unit, navigation and flight control. It does not carry an operator, can fly automatically or be remotely guided, and can carry tools for aerial operations. It is widely used in industries such as industry, agriculture, and military. Agricultural plant protection drones are often used to replace manual aerial operations. They can spray pesticides, seeds, powders, etc. through ground remote control or GPS flight control.

[0003] Aircraft generally use pressure nozzles for spraying operations. To prevent liquid dripping, the pressure nozzles in the prior art are provided with anti-drip valves and the opening pressure of the pressure valves is increased to prevent liquid dripping. However, when the pressure nozzle is opened, the pumping pressure is very low due to the gas inside the pipeline of the pressure nozzle, and the pressure nozzle cannot be opened. Therefore, it is necessary to automatically exhaust the gas in the pipeline by providing a solenoid valve, which results in a more complex and bulky pipeline structure and increases the cost.

[0004] In view of this, it is necessary to improve the drone spraying mechanism in the prior art to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to disclose a spraying device for an aircraft so as to solve the problem in the prior art that when an anti-drip valve is provided in the pressure nozzle, the pressure nozzle cannot be opened due to the presence of gas inside the pressure nozzle, and automatic exhaust needs to be achieved by adding a solenoid valve, resulting in a more complicated and bulky pipeline structure.

[0006] To achieve one of the above purposes, the present invention provides a spraying device for an aircraft, comprising:

[0007] A tank arranged on the aircraft body and used to store liquid;

[0008] a first pipeline connected to the box, wherein the first pipeline is equipped with a first medium pump for pumping liquid; and

[0009] a first nozzle extending in a direction away from the aircraft body and communicating with the first pipeline;

[0010] A one-way valve is installed between the first medium pump and the first nozzle, and the one-way valve is configured to open when the first medium pump pumps liquid to allow the liquid to pass through and flow to the first nozzle, and to close when the first medium pump stops pumping liquid to prevent the liquid from passing through and flowing to the first nozzle. The sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle is greater than the target height liquid column pressure, and the target height liquid column pressure is greater than or equal to the liquid column pressure between the one-way valve and the first nozzle.

[0011] As a further improvement of the present invention, the target height liquid column pressure is the liquid column pressure between the highest liquid level in the box and the lowest level of the first nozzle, and the opening pressure of the one-way valve is greater than the target height liquid column pressure.

[0012] As a further improvement of the present invention, the sum of the minimum working pressure of the first medium pump and the target height liquid column pressure is greater than the sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle.

[0013] As a further improvement of the present invention, it also includes:

[0014] a second pipeline connected to the box, wherein a second medium pump is disposed on the second pipeline; and

[0015] A second nozzle extending in a direction away from the aircraft body, connected to the second pipeline and away from the first nozzle.

[0016] As a further improvement of the present invention, the first nozzle is configured as a pressure nozzle, and the second nozzle is configured as a pressure nozzle or a centrifugal nozzle.

[0017] As a further improvement of the present invention, the end of the first pipeline forms at least two first branches respectively penetrating the corresponding first hollow machine arms, and the free end of each first branch is equipped with the first nozzle, and the one-way valve is arranged in the first branch;

[0018] The end of the second pipeline forms at least two second branches which respectively penetrate the corresponding second hollow machine arms, and the free end of each second branch is equipped with the second nozzle.

[0019] As a further improvement of the present invention, a multi-way adapter connected to at least two first branches is installed at the end of the first pipeline;

[0020] A multi-way adapter connected to at least two second branches is installed at the end of the second pipeline.

[0021] As a further improvement of the present invention, the box is connected to a three-way valve, and a first output end and a second output end of the three-way valve are connected to the first pipeline and the second pipeline respectively.

[0022] As a further improvement of the present invention, the first pipeline and / or the second pipeline is equipped with a flow meter for detecting liquid flow.

[0023] As a further improvement of the present invention, the first medium pump is configured as a diaphragm pump.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The spraying device of the aircraft of the present invention pumps the liquid flowing from the box to the first pipeline to the first nozzle through the first medium pump, so as to spray the liquid on the target object through the first nozzle. Due to the function of the one-way valve configured between the first medium pump and the first nozzle, the one-way valve is opened only when the first medium pump pumps the liquid to allow the liquid to pass through and flow to the first nozzle, and is closed when the first medium pump stops pumping the liquid to prevent the liquid from passing through and flowing to the first nozzle, and because the sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle is greater than the target height liquid column pressure, when the first medium pump stops pumping the liquid, it can prevent the remaining liquid in the pipeline between the one-way valve and the first nozzle from dripping from the first nozzle. In this way, the spraying device of the aircraft of the present invention can achieve the purpose of anti-drip without providing an anti-drip valve in the first nozzle. Moreover, the present invention reduces the opening pressure of the first nozzle without providing an anti-drip valve, so that the first medium pump can open the pressure nozzle without exhausting air, thereby solving the problem in the prior art that when an anti-drip valve is provided in the pressure nozzle, the pressure nozzle cannot be opened due to the presence of gas inside the pressure nozzle, and automatic exhaust needs to be achieved through a newly added solenoid valve, resulting in a more complicated and bulky pipeline structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic structural diagram of an aircraft according to an embodiment of the present invention;

[0027] Figure 2 A schematic structural principle diagram of a spraying device for an aircraft according to an embodiment of the present invention;

[0028] Figure 3 for Figure 2 A schematic enlarged structural diagram at center A;

[0029] Figure 4 for Figure 2 A schematic enlarged structural diagram of the interior of the first hollow machine arm at B in the middle;

[0030] Figure 5 The figure is a schematic connection structure diagram of a first medium pump, a one-way valve and a first nozzle according to an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention is described in detail below in conjunction with the various embodiments shown in the accompanying drawings, but it should be noted that these embodiments are not limitations of the present invention, and any equivalent transformations or substitutions in functions, methods, or structures made by ordinary technicians in the field based on these embodiments are all within the scope of protection of the present invention.

[0032] Combination Figures 1 to 5 To illustrate, this embodiment provides a spraying device for an aircraft, which includes: a box 101 arranged on the aircraft body 10 and storing liquid; a first pipeline 102 connected to the box 101, the first pipeline 102 is equipped with a first medium pump 103 for pumping liquid; and a first nozzle 104 extending in a direction away from the aircraft body 10 and connected to the first pipeline 102. The spraying device for the aircraft of this embodiment also includes a second pipeline 105 connected to the box 101, the second pipeline 105 is equipped with a second medium pump 106; and a second nozzle 107 extending in a direction away from the aircraft body 10, connected to the second pipeline 105 and away from the first nozzle 104. In this embodiment, the first medium pump 103 is configured as a diaphragm pump or a plunger pump or a peristaltic pump. Preferably, the first medium pump 103 of this embodiment is configured as a diaphragm pump. The first nozzle 104 of this embodiment is generally configured as a pressure nozzle. The second nozzle 107 is configured as a pressure nozzle or a centrifugal nozzle or other types of nozzles, which will not be described in detail. In this embodiment, two different types of nozzles can be set to spray the target object, which is convenient for the spraying device to be used in spraying scenes with different requirements, so as to improve the applicability of the spraying device of the aircraft.

[0033] Specifically, the aircraft body 10 is extended with at least two first hollow arms and at least two second hollow arms. The end of the first pipeline 102 forms at least two first branches that respectively penetrate the corresponding first hollow arms, and the free end of each first branch is equipped with a first nozzle 104. Among them, the one-way valve 108 can be arranged in the first branch; the one-way valve 108 can also be arranged on the outside of the first hollow arm, specifically, the one-way valve 108 is connected through a connecting pipeline 115, one end of the connecting pipeline 115 is connected to the first nozzle 104, and the other end of the connecting pipeline penetrates the first hollow arm and is connected to the first branch. A multi-way adapter (such as Figure 3The three-way adapter 111 shown in the figure is used to connect at least two first branches that respectively pass through the corresponding first hollow machine arms through the three-way adapter 111. In this embodiment, the three-way adapter 111 connects two first branches (first branch 1091' and first branch 1092') that pass through the corresponding first hollow machine arms (first hollow machine arm 1091 and first hollow machine arm 1092). Similarly, the end of the second pipeline 105 forms at least two second branches that respectively pass through the corresponding second hollow machine arms, and the free end of each second branch is equipped with a second nozzle 107. A multi-way adapter (such as Figure 3 The three-way adapter 112 shown in the figure is used to connect at least two second branches respectively penetrating the corresponding second hollow arms through the three-way adapter 112. In this embodiment, the three-way adapter 112 connects two second branches (second branch 1101' and second branch 1102') penetrating the corresponding second hollow arms (second hollow arm 1101 and second hollow arm 1102), and the free ends of the first hollow arms (first hollow arm 1091 and first hollow arm 1092) and the second hollow arms (second hollow arm 1101 and second hollow arm 1102) are both equipped with propellers 20 above, and the first nozzle 104 and the second nozzle 107 are respectively arranged below the propeller 20.

[0034] The box 101 of the present embodiment is connected with a three-way valve 113, and the first output end and the second output end of the three-way valve 113 are respectively connected to the first pipeline 102 and the second pipeline 105. A flow meter 114 for detecting the liquid flow is configured in the first pipeline 102 or the second pipeline 105 to monitor the overall flow of the spraying device. It is worth noting that a two-way valve is respectively arranged in the first pipeline 102 and the second pipeline 105, and the flow meter 114 is arranged at one end of the two-way valve. When only one pipeline in the first pipeline 102 and the second pipeline 105 is working, if the flow meter 114 is not arranged in the working first pipeline 102 (that is, the flow meter 114 is arranged in the non-working second pipeline 105), the two-way valve in the second pipeline 105 can be plugged in to connect the flow meter 114 to the first pipeline 102 required to work, that is, only the port where the flow meter 114 is connected to the second pipeline 105 is transferred to the two-way valve of the first pipeline 102, which is convenient for replacement and convenient for users to disassemble and maintain. Furthermore, since the liquid in the box 101 is diverted to the first pipeline 102 and the second pipeline 105 through the three-way valve 113, the error of the liquid flow rate flowing to the first pipeline 102 and the second pipeline 105 is very small, thus, the overall flow rate of the spraying device can be obtained by setting a flow meter 114 in one of the first pipeline 102 and the second pipeline 105, so that compared with the solution of setting a flow meter in each pipeline, this embodiment can save the cost of the spraying device, simplify the combination of the spraying device, and reduce the volume of the spraying device. Of course, this embodiment can set a flow meter in each pipeline according to the actual working conditions to monitor the flow in each pipeline respectively.

[0035] The two-way valve, three-way adapter 111, three-way adapter 112 and three-way valve 113 of this embodiment are generally configured to be pluggable, so that maintenance personnel can disassemble, repair and inspect the aircraft's spraying device, which greatly improves the applicability of the spraying device.

[0036] In the above embodiment, a one-way valve 108 is installed between the first medium pump 103 and the first nozzle 104 (specifically, the one-way valve 108 is arranged in each first hollow machine arm), and the sum of the working pressure (i.e., the minimum working pressure) of the first medium pump 103 and the pressure of the target height liquid column is greater than the sum of the opening pressure of the one-way valve 108 and the opening pressure of the first nozzle 104. Among them, the minimum working pressure refers to the pressure generated when the first medium pump 103 is turned on or when there is air. In this way, when the first medium pump 103 pumps liquid, even if there is air inside when it is just turned on so that the pumping pressure is less than its normal working pressure, the one-way valve 108 can be opened normally to allow the liquid to pass through in the C direction and flow to the first nozzle 104, so as to achieve spraying on the target object through the first nozzle, and the first medium pump 103 can work normally without exhausting the air in the pipeline to increase the pumping pressure of the first medium pump 103, thereby improving the overall convenience of operation. Furthermore, the opening pressure of the first nozzle 104 can be selected to be 0, and the minimum working pressure of the first medium pump is greater than the opening pressure of the one-way valve. At this time, normal opening can be achieved without considering the target height liquid column pressure, further simplifying the structural design and selection methods, and ensuring the applicability of the overall structure.

[0037] In order to ensure that the one-way valve 108 is closed when the first medium pump 103 stops pumping liquid, so as to prevent the liquid from passing through and flowing to the first nozzle 104, the sum of the opening pressure of the one-way valve 108 and the opening pressure of the first nozzle 104 is greater than the target height liquid column pressure, wherein the target height liquid column pressure is greater than or equal to the liquid column pressure between the one-way valve and the first nozzle, so as to avoid the target liquid column pressure being too large and thus conducting the one-way valve 108. Further, when the opening pressure of the first nozzle 104 is 0, the opening pressure of the one-way valve 108 is greater than the target height liquid column pressure, and the target liquid column pressure is less than the atmospheric pressure. At this time, even if the first nozzle 104 has no opening pressure, the liquid column in the pipeline will not drip, which can effectively play a drip-proof effect. In the actual aerial spraying process, the height of the liquid column in the pipeline is easily changed due to the change of the aircraft's attitude, so the target height liquid column pressure is the liquid column pressure between the highest liquid level in the box and the lowest level of the first nozzle. By setting the maximum liquid column pressure, it is ensured that even if the maximum liquid is stored in the pipeline, the liquid in the pipeline can be automatically prevented from dripping from the first nozzle 104 when the first medium pump 103 stops pumping liquid, which can effectively solve the dripping problem of the spraying device at any stage. Therefore, the first nozzle of this embodiment can achieve automatic drip prevention without setting an anti-drip valve.

[0038] For example, the opening pressure of the first nozzle is F1, the target height liquid column pressure is F2, the one-way valve opening pressure is F3, and the minimum opening pressure of the first medium pump is F4. At the time of initial conduction, F4+F2>F3+F1, ensuring that the one-way valve can be opened smoothly, and smooth conduction can be achieved without exhaust. After that, the pressure generated by the first medium pump is much greater than F4, which can ensure smooth operation. When the spraying device needs to be turned off, the first medium pump is turned off, and it does not generate pressure. Since F3+F1>F2, the liquid column in the pipeline will not drip. The anti-drip effect can be achieved through the structural design of the pipeline itself, and there is no need to install complex structures such as anti-drip valves, which significantly saves costs. In one embodiment, if F1=0, then F4+F2>F3>F2, and the appropriate one-way valve, first medium pump, and liquid column height can be determined according to this formula, thereby greatly simplifying the selection process of the one-way valve and the first medium pump, and greatly improving work efficiency.

[0039] In this embodiment, the above structure is also applicable to non-pressure nozzles. For example, the second nozzle can be a centrifugal nozzle, then F1 = 0, as long as F4 + F2 > F3 > F2 is satisfied, the automatic opening and automatic anti-drip functions can be achieved. The one-way valve is set in the second branch, and the one-way valve is installed between the second medium pump and the second nozzle to achieve the same effect. The specific process will not be repeated.

[0040] It should be noted that when the liquid needs to be pumped to the first nozzle 104 through the one-way valve 108 by the first medium pump 103 to spray the target object, even if gas is generated in the first medium pump 103, since the pressure generated by the presence of gas in the first medium pump 103 is much greater than the opening pressure of the one-way valve 108, the one-way valve 108 can be opened without exhausting the pipeline where the first medium pump 103 is located, so that the liquid flows to the first nozzle 104 and sprays the target object through the first nozzle 104. Therefore, this embodiment prevents the problem that the first nozzle cannot be opened due to the presence of gas in the first nozzle when an anti-drip valve is set in the first nozzle, thereby avoiding the problem that the pipeline structure is more complicated and the pipeline structure is relatively large by automatically exhausting the first nozzle by adding a solenoid valve.

[0041] It can be seen that the spraying device of the aircraft of this embodiment pumps the liquid flowing from the box 101 to the first pipeline 102 to the first nozzle 104 through the first medium pump 103, so as to spray the liquid on the target object through the first nozzle 104. Due to the function of the one-way valve 108 configured between the first medium pump 103 and the first nozzle 104, the one-way valve 108 is opened only when the first medium pump 103 pumps the liquid to allow the liquid to pass through and flow to the first nozzle 104, and is closed when the first medium pump 103 stops pumping the liquid, preventing the liquid from passing through and flowing to the first nozzle 104. And due to the mutual adaptation of the opening pressure of the one-way valve 108, the minimum working pressure of the first medium pump 103, the target height liquid column pressure, and the opening pressure of the first nozzle, the automatic opening and closing of the spraying device and the prevention of dripping are realized. In this way, the spraying device of the aircraft in this embodiment can achieve the purpose of anti-drip without providing an anti-drip valve in the first nozzle, thereby solving the problem in the prior art that when an anti-drip valve is provided in the pressure nozzle, the pressure nozzle cannot be opened due to the presence of gas inside the pressure nozzle, and automatic exhaust needs to be achieved through a newly added solenoid valve, resulting in a more complicated and bulky pipeline structure.

[0042] It should be noted that the target object involved in this embodiment is configured as crops, and the spraying device of the aircraft of this embodiment sprays the canopy of the crops when the aircraft flies above the crops. The liquid involved in this embodiment is generally configured as liquid medicine or water. In addition, the setting positions of the first nozzle 104 and the second nozzle 107 of this embodiment can be configured according to the actual working conditions. For example, the first nozzle 104 can be configured at the front end of the flight direction of the aircraft, or at the rear end of the flight direction of the aircraft. Alternatively, the first nozzle 104 can be configured on one side of the aircraft, and the second nozzle 107 can be configured on the other side of the aircraft, and so on. In other words, the assembly positions of the first nozzle 104 and the second nozzle 107 can be assembled according to the pipeline connection positions with the first pipeline 102 and the second pipeline 105, respectively, and no detailed description is given for this.

[0043] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A spraying device for an aircraft, characterized in that: include: A tank arranged on the aircraft body and used to store liquid; a first pipeline connected to the box, wherein a first medium pump for pumping liquid is installed in the first pipeline; as well as, a first nozzle extending in a direction away from the aircraft body and communicating with the first pipeline; Wherein, a one-way valve is installed between the first medium pump and the first nozzle, and the one-way valve is configured to open when the first medium pump pumps liquid to allow liquid to pass through and flow to the first nozzle, and to close when the first medium pump stops pumping liquid to prevent liquid from passing through and flowing to the first nozzle. The sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle is greater than the target height liquid column pressure, the target height liquid column pressure is greater than or equal to the liquid column pressure between the one-way valve and the first nozzle, and the target height liquid column pressure is the liquid column pressure between the highest liquid level in the box and the lowest level of the first nozzle.

2. The spraying device according to claim 1, characterized in that The opening pressure of the one-way valve is greater than the target height liquid column pressure.

3. The spraying device according to claim 1, characterized in that The sum of the minimum working pressure of the first medium pump and the target height liquid column pressure is greater than the sum of the opening pressure of the one-way valve and the opening pressure of the first nozzle.

4. The spraying device according to any one of claims 1 to 3, characterized in that: Also includes: a second pipeline connected to the box, wherein a second medium pump is arranged on the second pipeline; as well as, A second nozzle extending in a direction away from the aircraft body, connected to the second pipeline and away from the first nozzle.

5. The spraying device according to claim 4, characterized in that The first nozzle is configured as a pressure nozzle, and the second nozzle is configured as a pressure nozzle or a centrifugal nozzle.

6. The spraying device according to claim 4, characterized in that The end of the first pipeline forms at least two first branches respectively penetrating the corresponding first hollow machine arms, and the free end of each first branch is equipped with the first nozzle, and the one-way valve is arranged in the first branch; The end of the second pipeline forms at least two second branches which respectively penetrate the corresponding second hollow machine arms, and the free end of each second branch is equipped with the second nozzle.

7. The spraying device according to claim 6, characterized in that A multi-way adapter connected to at least two first branches is installed at the end of the first pipeline; A multi-way adapter connected to at least two second branches is installed at the end of the second pipeline.

8. The spraying device according to claim 4, characterized in that The box body is connected to a three-way valve, and a first output end and a second output end of the three-way valve are connected to the first pipeline and the second pipeline respectively.

9. The spraying device according to claim 8, characterized in that The first pipeline and / or the second pipeline is equipped with a flow meter for detecting liquid flow.

10. The spraying device according to claim 4, characterized in that The first medium pump is configured as a diaphragm pump.

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