Induction nozzle utilizing double-coil charging and restraining fog drop drifting and control method

Abstract

The invention discloses an induction nozzle utilizing double-coil charging and restraining droplet drifting and a control method, and relates to the technical field of plant protection spraying, the induction nozzle comprises a nozzle main body and a charging coil arranged close to a liquid inlet of the nozzle main body, and an anti-drifting coil is arranged at the nozzle outlet end of the nozzle main body; a nozzle of the nozzle main body is arranged in the middle of the nozzle main body and is coaxial with a first surrounding area of the charged coil; the charged coil is used for forming a first electric field in the first surrounding area, so that a liquid medicine medium sprayed by the nozzle is broken and charged, and charged fog drops are controlled to be located in the first surrounding area and advance towards a second surrounding area of the anti-floating coil; and the anti-floating coil forms a second electric field in the second surrounding area, and the second electric field is dynamically adjusted according to the external wind speed to restrain the charged fog drops. The coil electrode is adopted to simultaneously generate a charged electric field and a constraint magnetic field, and liquid droplet charging and trajectory constraint are completed in one step, so that unstable charging effect and safety risk caused by wetting the electrode by liquid droplets are avoided.

Description

Technical Field

[0001] The present application relates to the technical field of plant protection spraying, and in particular to an induction nozzle and a control method for utilizing dual coils for charging and restraining droplet drift. Background Art

[0002] Traditional crop protection operations suffer from low pesticide utilization rates in the field. A significant number of droplets do not adhere to the leaves of target crops, but instead drift into the soil, water, and air. Using electrostatic spraying significantly improves the adhesion rate of droplets to target crops, reducing pesticide consumption and avoiding environmental pollution. During the operation of inductive electrostatic spray nozzles, a high voltage must be applied to the charging electrode to ensure proper charging of the droplets. However, droplets carry a different charge through electrostatic induction, and under the influence of the electric field, they continuously drift toward the charging electrode, eventually causing some droplets to adhere to the surface of the charging electrode. The electric field deforms the attached droplets into a conical shape, generating corona discharge at the tip. Furthermore, as the attached droplets condense and dissipate, they attract and neutralize the charged droplets, reducing the overall charge quality of the droplets. Furthermore, when droplets are between the nozzle and the target crop, they are easily affected by wind, causing them to drift beyond the target crop, resulting in pesticide waste and environmental pollution.

[0003] The Chinese invention patent, "A Pneumatic Atomization Electrostatic Sprayer and Spray System," patent application number CN201810628110.0, discloses an electrostatic sprayer that utilizes high-speed atomization. This invention uses electrodes fixed at the nozzle to charge the droplets. However, during operation, the droplets of liquid medicine tend to drift and adhere to the electrodes, resulting in unstable charging. The Chinese invention patent, "A Combined Electrostatic Sprayer," patent application number CN202211716233.2, discloses a combined electrostatic sprayer that utilizes contoured electrodes and insulating resin to isolate the electrodes from the droplets. However, droplets can still drift toward the electrodes due to the electric field and adhere to the insulating housing, adversely affecting equipment safety and charging effectiveness. The Chinese invention patent, "An Anti-Drift Spraying Mechanism for Plant Protection UAVs," patent application number CN201921059145.3, discloses an anti-drift spraying mechanism for plant protection drones. This invention creates an air curtain around the spray area of ​​the sprayer to reduce the impact of external airflow on the droplets, thereby preventing them from drifting. However, the speed of the wind curtain airflow in the atmosphere decays rapidly, and at the same time, the wind curtain airflow will generate vortices. The irregular vortices will also affect the migration trajectory of the droplets, thereby causing the anti-drift effect to decay.

[0004] In summary, the existing nozzle products and patent applications in the field of electrostatic spraying cannot prevent the drift of droplets toward the electrodes to achieve stable and excellent charging effects. At the same time, they cannot effectively solve the problem of droplet drift in the atmosphere, resulting in waste of pesticides and environmental pollution. Summary of the Invention

[0005] In order to solve the above technical problems, this application proposes the following technical solutions: In the first aspect, an embodiment of the present application provides an induction nozzle that utilizes dual coils to charge and constrain the drift of droplets, comprising: a nozzle body, a charging coil arranged near the liquid inlet of the nozzle body, and an anti-drift coil arranged at the nozzle outlet end of the nozzle body; the nozzle of the nozzle body is arranged in the middle of the nozzle body and coaxial with the first surrounding area of ​​the charging coil; the charging coil is used to form a first electric field in the first surrounding area so that the liquid medium sprayed from the nozzle is broken and charged and the charged droplets are controlled to be within the first surrounding area and move into the second surrounding area of ​​the anti-drift coil; the anti-drift coil forms a second electric field in the second surrounding area, and the second electric field is dynamically adjusted according to the external wind speed to constrain the charged droplets.

[0006] In a possible implementation, an electrode holder is provided in the nozzle body, coil baffles are fixedly provided on the inner wall of the electrode holder in a circumferential arrangement, and the charged coil is wound on the coil baffles according to the arrangement of the coil baffles.

[0007] In one possible implementation, a coil cover is provided at the bottom of the charging coil, one end of the coil cover is connected to the motor support, and the other end extends along the inner wall of the nozzle outlet end to the outlet and is fixedly connected to the nozzle main body shell, forming a groove-shaped structure with the coil cover and the electrode support, and the charging coil is arranged in the groove-shaped structure.

[0008] In one possible implementation, the nozzle outlet end is a trumpet-shaped structure, the coil cover and the nozzle main body shell at the nozzle outlet end form a hollow gap, the anti-drifting coil is wound around the outer wall of the coil cover, and the diameter of the cross-section of the second surrounding area gradually increases from the first end of the trumpet-shaped structure close to the charged coil to the second end away from the charged coil.

[0009] In one possible implementation, a wire groove is provided between the electrode holder and the coil cover and the nozzle main body shell, and a wire hole is provided between the electrode holder and the coil cover. The charged coil is electrically connected to the external power supply device through the wire groove and the wire hole, and the anti-drifting coil is directly electrically connected to the external power supply device through the wire groove.

[0010] In a possible implementation, a wind speed current regulation module is arranged on the outer wall of the nozzle body shell, the wind speed current regulation module is electrically connected with the external power supply device, the wind speed current regulation module measures the wind speed, adjusts the current in the anti-drift coil according to the wind speed, dynamically regulates the magnetic field force in the second surrounding area of the anti-drift coil, and prevents the mist droplets from drifting horizontally to a large extent, thereby realizing mist droplet anti-drift.

[0011] In a second aspect, the embodiments of the present application provide a control method of the inductive nozzle for charging and restraining mist droplet drift by using double coils according to any possible implementation manner of the first aspect, and the control method comprises the following steps: controlling the nozzle at the liquid inlet of the inductive nozzle to spray liquid into the first surrounding area of the charging coil and determining the resultant velocity of the mist droplets under the action of the electric field force after the mist droplets are broken into mist droplets and charged; determining the Lorentz force for changing the movement of the mist droplets in the horizontal direction by using the horizontal velocity component in the resultant velocity, the mist droplet charge quantity and the magnetic field distribution in the charging coil; adjusting the first voltage of the charging coil to ensure that the trajectory of the circumferential movement of the mist droplets is always located in the first surrounding area; determining the coverage area radius of the mist droplets on the target crop in the spraying operation and the horizontal velocity of the mist droplets under the action of the external wind speed; adjusting the second voltage of the anti-drift coil according to the coverage area radius and the horizontal velocity of the mist droplets under the action of the external wind speed, regulating the space magnetic field of the second surrounding area of the anti-drift coil, restraining the drift trajectory of the mist droplets under the action of the external environment wind, and keeping the coverage area radius unchanged.

[0012] In a possible implementation, the determination of the Lorentz force for changing the movement of the mist droplets in the horizontal direction by using the horizontal velocity component in the resultant velocity, the mist droplet charge quantity and the magnetic field distribution in the charging coil comprises the following steps: establishing a coordinate system with the nozzle as the coordinate origin, and representing the spatial positions as x , y , z respectively; horizontally and vertically decomposing the resultant velocity of the mist droplets under the action of the electric field force after the mist droplets are charged to obtain the horizontal velocity component ; determining the magnetic field distribution in the charging coil , wherein: is the vacuum permeability, is the number of turns of the coil, is the current in the coil, R is the radius of the coil surrounding area, and x is the axial distance of the coil; determining the mist droplet charge quantity , wherein: is the vacuum permittivity, is the surface tension of the droplets, is the droplet radius, is the electric field strength in the area surrounded by the charged coil, , is the conductor resistivity, is the current density, , is the cross-sectional area of ​​the charged coil, is the current direction unit vector; Changing the Lorentz force of the droplet in the horizontal direction .

[0013] In one possible implementation, the second voltage of the anti-drift coil is adjusted according to the radius of the coverage area and the horizontal velocity of the droplets under the external wind speed, and the spatial magnetic field of the second surrounding area of ​​the anti-drift coil is regulated to constrain the drift trajectory of the droplets under the external wind and maintain the coverage area radius unchanged, including: According to the horizontal velocity of the droplets under the action of external wind speed , the mass of the droplets , the charge of the droplets And coverage area radius Determine the magnetic field distribution of the anti-drift coil controlling the droplets in the coverage area of ​​the target crop ; According to the Obtaining the Lorentz force that constrains the droplets from the external wind .

[0014] In the embodiment of the present application, a coil electrode is used to simultaneously generate a charging electric field and a confining magnetic field, so that the charging and trajectory confinement of the liquid droplets are completed in one step, avoiding the droplets wetting the electrodes and causing unstable charging effects and safety risks; The anti-drift coil generates a magnetic field that constrains the trajectory of charged droplets, counteracting the effects of side winds and preventing them from drifting. The coil electrode voltage and current are adjustable to control droplet trajectory at varying charge-to-mass ratios, adapting to a variety of operating environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A cross-sectional view of an induction nozzle that utilizes dual coils for charging and restricting droplet drift, provided in an embodiment of the present application; Figure 2 A flow chart of a control method for an induction nozzle that utilizes dual-coil charging and restricts droplet drift, provided in an embodiment of the present application; Figure 3 Schematic diagram of the Lorentz force constraining the trajectory of charged droplets provided in an embodiment of the present application; Figure 1-3In the symbol, it is represented as: 1-Nozzle body, 2-Liquid inlet, 3-Charging coil, 4-Anti-drifting coil, 5-First surrounding area, 6-Nozzle, 7-Second surrounding area, 8-Electrode holder, 9-Coil baffle, 10-Coil cover, 11-Nozzle outlet, 12-Nozzle body shell, 13-Middle gap, 14-Wire groove, 15-Wind speed and current control module. DETAILED DESCRIPTION

[0016] The present invention will be described below with reference to the accompanying drawings and specific implementation methods.

[0017] See also Figure 1 The induction nozzle provided in this embodiment uses dual coils to charge and restrain the drift of droplets, including: a nozzle body, a charging coil arranged near the liquid inlet of the nozzle body, and an anti-drift coil arranged at the nozzle outlet end of the nozzle body; the nozzle of the nozzle body is arranged in the middle of the nozzle body and is coaxial with the first surrounding area of ​​the charging coil; the charging coil is used to form a first electric field in the first surrounding area so that the liquid medium sprayed from the nozzle is broken and charged and the charged droplets are controlled to be within the first surrounding area and move toward the second surrounding area of ​​the anti-drift coil; the anti-drift coil forms a second electric field in the second surrounding area, and the second electric field is dynamically adjusted according to the external wind speed to restrain the charged droplets.

[0018] An electrode holder is provided in the nozzle body, and coil baffles are fixedly provided on the inner wall of the electrode holder in a circumferential arrangement. The charged coil is wound on the coil baffles according to the arrangement of the coil baffles.

[0019] In this embodiment, a coil cover is provided at the bottom of the charging coil, one end of the coil cover is connected to the motor support, and the other end extends along the inner wall of the nozzle outlet end to the outlet and is fixedly connected to the nozzle main body shell, forming a groove-shaped structure with the coil cover and the electrode support, and the charging coil is arranged in the groove-shaped structure.

[0020] like Figure 1 As shown, the nozzle outlet end is a trumpet-shaped structure, the coil cover and the nozzle main body shell of the nozzle outlet end form a hollow gap, the anti-drifting coil is wound around the outer wall of the coil cover, and the diameter of the cross-section of the second surrounding area gradually increases from the first end of the trumpet-shaped structure close to the charged coil to the second end away from the charged coil.

[0021] In this embodiment, a wire groove is provided between the electrode holder and the coil cover and the nozzle main body shell, and a wire hole is provided between the electrode holder and the coil cover. The charged coil is electrically connected to the external power supply device through the wire groove and the wire hole, and the anti-drifting coil is directly electrically connected to the external power supply device through the wire groove.

[0022] A wind speed and current control module is provided on the outer wall of the nozzle main body shell, and the wind speed and current control module is electrically connected to the external power supply equipment. The wind speed and current control module measures the wind speed, adjusts the current in the anti-drift coil according to the wind speed, and dynamically controls the magnetic field force in the second coil to prevent the droplets from drifting horizontally and thus achieve anti-drifting of droplets.

[0023] Corresponding to the induction nozzle provided in the above embodiment that utilizes dual coils to charge and constrain the drift of droplets, the present application also provides an embodiment of a method for controlling an induction nozzle that utilizes dual coils to charge and constrain the drift of droplets.

[0024] See also Figure 2 The induction nozzle control method of this embodiment using dual-coil charging and restricting droplet drift includes: S101, controlling the nozzle at the liquid inlet of the induction nozzle to spray liquid into the first surrounding area of ​​the charging coil and determining the combined velocity of the liquid after it breaks into charged droplets under the action of the electric field force.

[0025] S102 , determining a Lorentz force that changes the horizontal motion of the droplet using a horizontal velocity component in the resultant velocity, the charge of the droplet, and the magnetic field distribution within the charging coil.

[0026] The coordinate system is established with the nozzle as the coordinate origin, and the spatial positions are respectively x 、 y 、 z The horizontal velocity component is obtained by decomposing the total velocity of the droplet under the action of the electric field force horizontally and vertically. .

[0027] Determine the magnetic field distribution within the charged coil ,in: is the vacuum permeability, Number of coil turns, is the current in the coil, R is the radius of the coil surrounding area, and x is the axial distance of the coil.

[0028] Determine the droplet charge ,in: is the dielectric constant of vacuum, is the surface tension of the droplets, is the droplet radius, an electric field strength in a region surrounding the charged coil, , a resistivity of the conductor, a current density, , a cross-sectional area of the charged coil, a unit vector of the current direction.

[0029] a Lorentz force changing the horizontal movement of the droplets . Referring to Figure 3 a schematic diagram of an electrostatic induction nozzle for restricting the trajectory of the charged droplets by a Lorentz force.

[0030] S103, adjusting the first voltage of the charged coil to ensure that the trajectory of the circumferential movement of the droplets is always located in the first surrounding region.

[0031] S104, determining the coverage area radius of the droplets on the target crop in the pesticide application operation and the horizontal velocity of the droplets under the action of the external wind speed.

[0032] S105, adjusting the second voltage of the anti-drift coil according to the coverage area radius and the horizontal velocity of the droplets under the action of the external wind speed, and adjusting the space magnetic field of the second surrounding region of the anti-drift coil to restrict the drift trajectory of the droplets under the action of the external environment wind and keep the coverage area radius unchanged.

[0033] determining the magnetic field distribution of the anti-drift coil for controlling the droplets in the coverage area of the target crop according to the horizontal velocity of the droplets under the action of the external wind speed , the mass of the droplets , the charge of the droplets and the coverage area radius ; obtaining the Lorentz force for restricting the droplets under the action of the external environment wind according to the .

[0034] ​In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. Among them, A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can be represented by: a, b, c, ab, ac, bc, or abc, where a, b, c can be single or multiple.

[0035] The above description is merely a specific embodiment of the present application. Any person skilled in the art may easily conceive of variations or substitutions within the technical scope disclosed in this application, and such variations or substitutions shall be within the scope of protection of this application. The scope of protection of this application shall be subject to the scope of protection of the claims.

Claims

1. An induction nozzle that uses dual coils to charge and constrain droplet drift, characterized in that: It includes: a nozzle body, a charged coil arranged near the liquid inlet of the nozzle body, and an anti-drift coil arranged at the nozzle outlet end of the nozzle body; the nozzle of the nozzle body is arranged in the middle of the nozzle body and is coaxial with the first surrounding area of ​​the charged coil; the charged coil is used to form a first electric field in the first surrounding area so that the liquid medium sprayed by the nozzle is broken and charged and the charged droplets are controlled to be in the first surrounding area and move into the second surrounding area of ​​the anti-drift coil; the anti-drift coil forms a second electric field in the second surrounding area, and the second electric field is dynamically adjusted according to the external wind speed to constrain the charged droplets.

2. The induction nozzle utilizing dual coils for charging and restricting droplet drift according to claim 1 is characterized in that: An electrode holder is provided in the nozzle body, and coil baffles are fixedly provided on the inner wall of the electrode holder in a circumferential arrangement. The charged coil is wound on the coil baffles according to the arrangement of the coil baffles.

3. The induction nozzle according to claim 2, which utilizes dual coils to charge and constrain the drift of droplets, is characterized in that: A coil cover is provided at the bottom of the charging coil, one end of the coil cover is connected to the motor support, and the other end extends along the inner wall of the nozzle outlet end to the outlet and is fixedly connected to the nozzle main body shell, forming a groove-shaped structure with the coil cover and the electrode support, and the charging coil is arranged in the groove-shaped structure.

4. The induction nozzle utilizing dual coils for charging and restricting droplet drift according to claim 3 is characterized in that: The nozzle outlet end is a trumpet-shaped structure, and the coil cover and the nozzle main body shell at the nozzle outlet end form a hollow gap. The anti-drifting coil is wound around the outer wall of the coil cover. From the first end of the trumpet-shaped structure close to the charged coil to the second end away from the charged coil, the diameter of the cross-section of the second surrounding area gradually increases.

5. The induction nozzle utilizing dual coils for charging and restricting droplet drift according to claim 4 is characterized in that: A wire groove is provided between the electrode holder and the coil cover and the nozzle main body shell, and a wire hole is provided between the electrode holder and the coil cover. The charged coil is electrically connected to the external power supply device through the wire groove and the wire hole, and the anti-drifting coil is directly electrically connected to the external power supply device through the wire groove.

6. The induction nozzle utilizing dual coils for charging and restricting droplet drift according to claim 5, characterized in that: A wind speed and current control module is provided on the outer wall of the nozzle main body shell, and the wind speed and current control module is electrically connected to the external power supply equipment. The wind speed and current control module measures the wind speed, adjusts the current in the anti-drift coil according to the wind speed, and dynamically controls the magnetic field force in the second coil to prevent the droplets from drifting horizontally and thus achieve anti-drifting of droplets.

7. A control method for an induction nozzle utilizing dual-coil charging and mist droplet drift restraining according to any one of claims 1 to 6, characterized in that: include: Control the nozzle at the liquid inlet of the induction nozzle to spray the liquid into the first surrounding area of ​​the charging coil and determine the combined velocity of the liquid after it breaks into charged droplets under the action of the electric field force; Determining a Lorentz force that changes the horizontal motion of the droplets using a horizontal velocity component in the resultant velocity, a charge of the droplets, and a magnetic field distribution within the charging coil; adjusting the first voltage of the charging coil to ensure that the trajectory of the circular motion of the mist droplets is always within the first surrounding area; Determine the coverage radius of the target crop and the horizontal velocity of the droplets under the influence of external wind speed during the spraying operation; The second voltage of the anti-drift coil is adjusted according to the radius of the coverage area and the horizontal speed of the droplets under the action of the external wind speed, and the spatial magnetic field of the second surrounding area of ​​the anti-drift coil is regulated to constrain the drift trajectory of the droplets under the action of the external environmental wind and keep the coverage area radius unchanged.

8. The control method of the induction nozzle using dual-coil charging and mist droplet drift restraining according to claim 7, characterized in that: The method of determining the Lorentz force that changes the horizontal motion of the droplets by utilizing the horizontal velocity component in the resultant velocity, the charge of the droplets, and the magnetic field distribution within the charging coil comprises: The coordinate system is established with the nozzle as the coordinate origin, and the spatial positions are respectively x 、 y 、 z express; The horizontal velocity component is obtained by decomposing the total velocity of the droplets under the action of the electric field force horizontally and vertically. ; Determine the magnetic field distribution within the charged coil ,in: is the vacuum permeability, Number of coil turns, is the current in the coil, R is the radius of the coil surrounding area, and x is the axial distance of the coil; Determine the droplet charge ,in: is the dielectric constant of vacuum, is the surface tension of the droplets, is the droplet radius, is the electric field strength in the area surrounded by the charged coil, , is the conductor resistivity, is the current density, , is the cross-sectional area of ​​the charged coil, is the current direction unit vector; Changing the Lorentz force of the droplet in the horizontal direction .

9. The control method of an induction nozzle utilizing dual-coil charging and mist droplet drift restriction according to claim 7, characterized in that: The second voltage of the anti-drifting coil is adjusted according to the radius of the coverage area and the horizontal velocity of the droplets under the action of the external wind speed, and the spatial magnetic field of the second surrounding area of ​​the anti-drifting coil is regulated to constrain the drift trajectory of the droplets under the action of the external environmental wind and keep the coverage area radius unchanged, including: According to the horizontal velocity of the droplets under the action of external wind speed , the mass of the droplets , the charge of the droplets And coverage area radius Determine the magnetic field distribution of the anti-drift coil controlling the droplets in the coverage area of ​​the target crop ; According to the Obtaining the Lorentz force that constrains the droplets from the external wind .

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