Venturi effect electrostatic nozzle and pesticide spraying device suitable for crop spraying

Abstract

The invention discloses a Venturi effect electrostatic nozzle and a pesticide spraying device that can be adapted to crop spraying. The invention solves the problems of poor spray penetration and spraying waste in the prior art, and has the beneficial effects of high droplet deposition efficiency and improved ecological environment. The scheme is as follows: a Venturi effect electrostatic nozzle that can be adapted to crop spraying, comprising a nozzle for conveying liquid medicine inside, the liquid medicine is sprayed out at the nozzle of the nozzle; a protective cover is arranged outside the nozzle, an air supply channel is formed between the protective cover and the nozzle, the inner diameter of the protective cover suddenly changes at the nozzle of the nozzle to form a Venturi effect area, and an electrostatic atomization component is arranged at the end of the protective cover to perform secondary atomization on the liquid medicine.

Description

Technical Field

[0001] The invention relates to the field of plant protection machinery, and in particular to a Venturi effect electrostatic spray head and a pesticide spraying device that can be adapted to spraying crops. Background Art

[0002] At present, pesticide control is the most common method of controlling crop diseases and insect pests. In particular, chemical pesticides are effective in controlling large-scale diseases and insect pests. Therefore, chemical pesticide control still occupies a dominant position in the field of plant protection. In the spraying of pesticides on crops, air-conveying sprayers, boom sprayers and induction electrostatic sprayers are mainly used. However, due to the large difference in the distance from the nozzle to the canopy height of the air-conveying sprayer, there is a phenomenon of uneven application of pesticides at different heights of crops and failure to spray higher plants; due to the poor spray penetration of the boom sprayer, there is a problem of uneven application of pesticides inside and outside the crops, resulting in a waste of resources; the induction electrostatic sprayer is not fully charged and has a low initial velocity, so that most of the droplets are deposited on the target close to the nozzle, which not only affects the spraying effect, but also pollutes the environment.

[0003] Therefore, it is very necessary to develop a Venturi effect electrostatic nozzle that can adapt to crop spraying. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the present invention provides a Venturi effect electrostatic nozzle that can be adapted to crop spraying. The Venturi effect is combined with two charging methods, namely, induction charging and corona charging, so that the droplets can obtain a higher initial velocity on the basis of being fully charged, thereby improving the droplet deposition efficiency, reducing the droplet drift and loss, and improving the ecological environment; and the wind force under the Venturi effect can make the droplets obtain a sufficient initial velocity when they are doing directional movement, thereby greatly improving the transportation distance of the droplets.

[0005] A specific scheme of a Venturi effect electrostatic sprinkler suitable for crop spraying is as follows:

[0006] A Venturi effect electrostatic sprinkler suitable for crop spraying, comprising:

[0007] The internal nozzle is used for delivering the liquid medicine, and the liquid medicine is sprayed out at the nozzle of the nozzle, and the nozzle is a variable diameter nozzle;

[0008] The protective cover is arranged outside the nozzle, and an air supply channel is formed between the protective cover and the nozzle. The inner diameter of the protective cover suddenly changes at the nozzle outlet to form a Venturi effect area, and an electrostatic atomization component is arranged at the end of the protective cover to perform secondary atomization on the liquid medicine.

[0009] The nozzle of the entire nozzle is used to transport the liquid medicine and spray it out through the nozzle, so that the liquid medicine completes the initial atomization. The wind force reaches the mutation point through the air supply channel. The gas here and the droplets sprayed out of the nozzle are combined in the Venturi effect area, so that the atomized droplets obtain a certain initial acceleration. Further, the droplets are fully charged under the action of the electrostatic atomization component, and then the droplets repel each other under the same charge, thereby achieving secondary atomization.

[0010] Furthermore, the outer diameter of the nozzle on one side close to the sudden change of the protective cover is larger than the outer diameter of the other side to increase the air supply speed because the air supply channel becomes narrower.

[0011] Furthermore, a nozzle is arranged at the nozzle mouth of the nozzle, and the diameter of the tube at the inlet inside the nozzle is larger than the diameter of the tube at the outlet, so as to increase the speed of the medicine liquid through the Venturi effect, and a step is arranged at the end of the nozzle to support the nozzle, the nozzle is threadedly connected to the nozzle, and a step is also arranged circumferentially of the nozzle. The back cap is arranged circumferentially of the nozzle, and the step is used to install an O-ring is arranged at the nozzle to improve the sealing performance, and the outlet end of the nozzle is arranged at the mutation point of the protective cover.

[0012] Furthermore, the protective cover includes a first section, a mutation section and a second section. The first section is a cylindrical protective cover arranged in the annular direction of the nozzle, the second section is a conical protective cover connected to the first section, and the mutation section is arranged between the first section and the second section.

[0013] Furthermore, the inner diameter of the sudden change section of the protective cover first gradually decreases and then gradually increases from the first section to the second section, the nozzle end is arranged at the inner diameter reduction section of the sudden change section, and the interior of the sudden change section is a smooth curved surface.

[0014] Furthermore, the electrostatic atomization component includes an induction electrode arranged on the side wall of the conical protective cover.

[0015] Furthermore, the electrostatic atomization component also includes an electric needle with one end connected to the induction electrode; there are multiple electric needles, and the multiple electric needles are evenly arranged on the induction electrode. The induction electrode and the electric needle are connected to the power supply equipment, so that the droplets can be fully charged under the double charging action.

[0016] Furthermore, a partition is provided in the air supply channel, a first through hole for the nozzle to pass through is provided in the center of the partition, a plurality of second through holes for air supply are provided on the side of the first through hole of the partition, and the transverse cross section of the second through hole is fan-shaped.

[0017] Furthermore, a pipe cap is provided at the end of the protective cover, an air inlet is opened on the side of the pipe cap, an air inlet pipe is provided at the air inlet, and the setting direction of the air inlet is perpendicular to the length direction of the nozzle or is arranged at a set angle;

[0018] The end of the nozzle protrudes from the pipe cap, which is made of non-metallic material to prevent leakage. The pipe cap and the cylindrical protective cover are connected by threads. A sealing ring is installed at the joint between the pipe cap and the nozzle, mainly to prevent the input gas from leaking out.

[0019] In order to overcome the deficiencies of the prior art, the present invention further provides a pesticide spraying device, which adopts the Venturi effect electrostatic nozzle that can adapt to crop spraying.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) In the present invention, the droplets are first formed by hydraulic extrusion at the nozzle, and then the droplets are charged by the conical induction electrode and the electric needle on the conical induction electrode. The droplets are further charged under the action of the electric field force to achieve secondary atomization, which is more suitable for crop spraying operations and more uniform pesticide application.

[0022] 2) The droplets of the present invention acquire an initial velocity under the action of the wind force sent from the air supply channel of the Venturi effect, thereby greatly improving the transport distance of the droplets.

[0023] 3) The present invention obtains negative charge at the nozzle through the droplets. When the negatively charged droplets reach the plants, the plant surface induces charges of opposite polarity to the electrode, so the positive charge is transferred to the plant surface and the negative charge is transferred to the plant root. According to the principle of opposites attract, the droplets are firmly attached to the plant surface, the droplet deposition efficiency is improved, the droplet drift and loss is reduced, and the ecological environment is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings in the specification, which constitute a part of the present application, are used to provide further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0025] Figure 1 It is a schematic diagram of the main view of the Venturi effect electrostatic nozzle of the present invention;

[0026] Figure 2 It is a schematic diagram of the explosion of the Venturi effect electrostatic nozzle of the present invention;

[0027] Figure 3 Schematic cross-sectional view of the Venturi effect electrostatic nozzle of the present invention;

[0028] Figure 4 Parts drawing of the partition;

[0029] Figure 5 This is the pipe cap parts drawing;

[0030] Figure 6 This is the schematic diagram of the Venturi effect electrostatic nozzle;

[0031] Figure 7 Schematic diagram of the electrification process for crops;

[0032] Among them: 1. electric needle, 2. sensing electrode, 3. conical protective cover, 4. cylindrical protective cover, 5. nozzle, 6. back cap, 7. O-ring, 8. partition, 9. sealing ring, 10. pipe cap, 11. nozzle, 12. wire, 13. high-voltage electrostatic generator, 14. Venturi effect area, 15. air supply channel, 16. air inlet pipe, 17. liquid medicine delivery pipeline, 18. nozzle, 19. droplets, 20. plants, 21. soil. DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0035] As introduced in the background technology, there are deficiencies in the prior art. In order to solve the above technical problems, the present application proposes a Venturi effect electrostatic nozzle that can be adapted to crop spraying.

[0036] In a typical implementation of the present application, Figure 1-Figure 3 As shown, a Venturi effect electrostatic sprinkler suitable for crop spraying includes a nozzle 11 for conveying liquid medicine inside, the liquid medicine is sprayed out at the nozzle of the nozzle 11, and the nozzle is a variable diameter nozzle; a protective cover is arranged outside the nozzle 11, an air supply channel 15 is formed between the protective cover and the nozzle 11, the inner diameter of the protective cover suddenly changes at the nozzle of the nozzle to form a Venturi effect area 14, and an electrostatic atomization component is provided at the end of the protective cover to perform secondary atomization on the liquid medicine.

[0037] The nozzle 11 of the entire nozzle is used to transport the liquid medicine and spray it out through the nozzle, so that the liquid medicine completes the initial atomization. The wind reaches the mutation point of the protective cover through the air supply channel 15. The gas here and the droplets sprayed out of the nozzle are combined in the Venturi effect area 14, so that the atomized droplets obtain a certain initial acceleration. Further, the droplets are fully charged under the action of the electrostatic atomization component, and then the droplets repel each other under the same charge, thereby achieving secondary atomization.

[0038] The outer diameter of one side of the nozzle 11 near the mutation is larger than the outer diameter of the other side to increase the air supply speed, mainly for the purpose of forming a Venturi effect air supply channel 15. A nozzle 5 is arranged at the nozzle of the nozzle 11, and the nozzle 5 is assembled with the nozzle 11 by threads. The pipe diameter at the internal inlet of the nozzle 5 is larger than the pipe diameter at the outlet, and a step is arranged at the end of the nozzle 11 to support the nozzle 5. The nozzle 5 is threadedly connected to the nozzle, and a step is also arranged in the circumferential direction of the nozzle 5. The back cap 6 is arranged in the circumferential direction of the nozzle 5, and the back cap 6 is threadedly connected to the nozzle 5. The step of the nozzle 11 is used to install the O-ring 7 made of rubber material at the nozzle to improve the sealing performance.

[0039] Among them, the diameter of the tube at the inlet of the nozzle 5 is larger than the diameter of the tube at the outlet, and the outlet end of the nozzle 5 protrudes from the nozzle. Under the condition of constant gas pressure, flow velocity and flow rate at the inlet, according to the Bernoulli equation

[0040]

[0041] p1 is the pressure of air input;

[0042] p2 is the air pressure at the narrowest section of the Venturi effect tube (the narrowest part of the mutation section);

[0043] r1 is the air weight;

[0044] u1 is the velocity of the air inlet;

[0045] u2 is the air velocity in the narrowest section of the Venturi effect tube;

[0046] The gravitational acceleration is about 9.8 m / s 2 .

[0047] Through calculation, the corresponding nozzle outlet diameter can be set to obtain the corresponding flow rate.

[0048] The protective cover includes a first section, a sudden change section and a second section. The first section is a cylindrical protective cover 4 arranged in the annular direction of the nozzle, and the second section is a conical protective cover 3 connected to the first section. The sudden change section is arranged between the first section and the second section. The inner diameter of the sudden change section of the protective cover gradually decreases from the first section to the second section and then gradually increases. The end of the nozzle is arranged at the inner diameter reduction section of the sudden change section. The increase in the inner diameter of the protective cover forms a Venturi effect area. The inside of the sudden change section is a smooth curved surface to smoothly allow the transported air to enter the Venturi effect area 14, and the outlet end of the nozzle 5 is arranged at the sudden change section. The cylindrical protective cover 4 is made of insulating material, and the conical protective cover 3 is also made of insulating material.

[0049] The electrostatic atomization component includes an induction electrode 2 disposed on the side wall of the conical protective cover, so that the induction electrode 2 is also conical. The electrostatic atomization component also includes an electric needle 1 connected to the conical protective cover 3 at one end; there are multiple electric needles 1, and the multiple electric needles 1 are evenly arranged on the induction electrode 2. The induction electrode 2 and the electric needle 1 are respectively connected to the power supply device 13 through a wire 12, and the power supply device 13 is an electrostatic generator. Another wire 12 is connected to the nozzle 5, which can make the droplets fully charged under the double charging action. The induction electrode 2 and the electric needle 1 are connected together by welding, and the induction electrode 2 and the conical protective cover 3 are bonded together.

[0050] When working, connect the electrostatic generator, close the switch, the electrostatic generator starts working, and the sensing electrode and the electric needle are negatively high. The pressurized liquid enters the nozzle 5 from the nozzle 11. At the nozzle, due to the reduction of the cross-sectional area of ​​the infusion channel, the flow rate is greatly increased, that is, part of the pressure head is converted into the velocity head. When it is ejected from the nozzle at high speed, the liquid is broken and atomized into fine droplets under the action of the internal and external pressure difference and the air impact force. In the sensing electrode 2, since the droplets are conductors, coupled with the effect of the DC high voltage, the sensing electrode and the droplets form a path, and current passes through, so the droplets carry the same charge as the sensing electrode. At the same time, the electric needle 1 generates a local electric field sufficient to ionize the surrounding air, forming positive ions and negative ions. The positive ions tend to be neutralized by the electric needle 1, and the negative ions are carried away by the passing droplets. The droplets charged by the sensing electrode 2 and the electric needle 1 carry the same charge as the electrodes, that is, negative charge. Due to the repulsion between the surface charges of the droplets and the influence of the Rayleigh limit, the droplets continue to split and further refine. Under the action of the electrostatic field between the nozzle 5 and the target 20, the mist droplets have a certain tendency to move toward the target.

[0051] A partition 8 is provided in the air supply channel 15. A first through hole for the nozzle 11 to pass through is provided in the center of the partition 8. A plurality of second through holes for air supply are provided on the side of the first through hole of the partition. The transverse cross section of the second through hole is fan-shaped. The partition 8 and the nozzle 11 are assembled by threading. Figure 4 shown.

[0052] A pipe cap 10 is provided at the end of the protective cover. Figure 5 As shown, an air inlet is opened on the side of the pipe cap 10, and an air inlet pipe 16 is arranged at the air inlet. The arrangement direction of the air inlet is perpendicular to the length direction of the nozzle 11 or arranged at a set angle. The air inlet pipe is connected to the fan to provide wind support;

[0053] The end of the nozzle 11 is provided with a protruding pipe cap, which is made of non-metallic material to prevent leakage. The pipe cap and the cylindrical protective cover are connected by threads. A rubber sealing ring 9 is installed at the joint between the pipe cap 10 and the nozzle, mainly to prevent leakage of the input gas.

[0054] In order to overcome the deficiencies of the prior art, the present invention further provides a pesticide spraying device, which uses the Venturi effect electrostatic nozzle that can adapt to crop spraying, and the liquid supply component is connected to the end of the spray pipe 11 to supply liquid.

[0055] like Figure 7 As shown, the droplets acquire negative charges at the nozzle. When the negatively charged droplets 19 reach the plants 20, the plant surface induces charges of opposite polarity to the electrodes, so that the positive charges are transferred to the plant surface and the negative charges are transferred to the plant roots in the soil 21. Based on the principle of opposites attract, the droplets are firmly attached to the plant surface.

[0056] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A Venturi effect electrostatic nozzle suitable for crop spraying, characterized in that: include: The internal nozzle is used for delivering the liquid medicine, and the liquid medicine is sprayed out at the nozzle of the nozzle, and the nozzle is a variable diameter nozzle; A protective cover is arranged outside the nozzle, an air supply channel is formed between the protective cover and the nozzle, the inner diameter of the protective cover suddenly changes at the nozzle outlet to form a Venturi effect area, and an electrostatic atomization component is arranged at the end of the protective cover to perform secondary atomization on the liquid medicine; The outer diameter of the nozzle on one side close to the protective cover mutation is larger than the outer diameter of the other side to increase the air supply speed, the main purpose of which is to form a Venturi effect air supply channel; The protective cover comprises a first section, a sudden change section and a second section. The first section is a cylindrical protective cover arranged in the annular direction of the nozzle. The second section is a conical protective cover connected to the first section. The sudden change section is arranged between the first section and the second section. The inner diameter of the sudden change section of the protective cover gradually decreases from the first section to the second section and then gradually increases. The nozzle end is arranged at the inner diameter reduction section of the sudden change section. The nozzle is provided at the nozzle opening, the diameter of the nozzle at the inlet is larger than the diameter of the nozzle at the outlet, and the nozzle outlet protrudes from the nozzle. When the gas pressure, flow velocity and flow rate at the inlet are constant, according to the Bernoulli equation ； is the air input pressure; It is the air pressure at the narrowest part of the mutation section; It is the weight of air; is the velocity of the air inlet; is the air velocity at the narrowest part of the mutation section; The gravitational acceleration is about 9.8 m / s 2 , Through calculation, if you want to get the corresponding flow rate, you can set the corresponding nozzle outlet diameter; The electrostatic atomization component includes an induction electrode arranged on the side wall of the conical protective cover; The electrostatic atomization component further includes an electric needle with one end connected to the induction electrode; there are a plurality of electric needles, and the plurality of electric needles are evenly arranged on the induction electrode; The induction electrode and the electric needle are connected to a power supply device through wires respectively. The power supply device is an electrostatic generator. Another wire is connected to the nozzle, so that the droplets can be fully charged under the double charging effect.

2. A Venturi effect electrostatic nozzle suitable for crop spraying according to claim 1, characterized in that: The end of the nozzle is provided with a step to support the nozzle, the nozzle is threadedly connected to the nozzle, a step is also provided in the circumferential direction of the nozzle, and a back cap is provided in the circumferential direction of the nozzle; The outlet end of the nozzle is arranged at the sudden change of the protection cover.

3. The Venturi effect electrostatic nozzle for crop spraying according to claim 1, characterized in that: A partition is arranged in the air supply channel, a first through hole for the nozzle to pass through is arranged at the center of the partition, and a plurality of second through holes for air supply are arranged on the side of the first through hole of the partition.

4. The Venturi effect electrostatic nozzle suitable for crop spraying according to claim 1, characterized in that: A pipe cap is arranged at the end of the protective cover, and an air inlet is opened on the side of the pipe cap. The arrangement direction of the air inlet is perpendicular to the length direction of the nozzle or arranged at a set angle; The end of the nozzle is protruded from the tube cap.

5. The Venturi effect electrostatic nozzle suitable for crop spraying according to claim 1, characterized in that: The mutation section has a smooth transition.

6. A pesticide spraying device, characterized in that: A Venturi effect electrostatic nozzle suitable for crop spraying as claimed in any one of claims 1 to 5.

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