An electrostatic spray ultra-high voltage induction charging device with capacitor in front

Abstract

The present invention relates to the field of agricultural plant protection, and specifically discloses an electrostatic spray ultra-high voltage induction charging device with a capacitor in front, comprising a spray system, an electrostatic generator, a high voltage capacitor, and a contact electrode; the electrostatic generator is connected to the upper plate of the high voltage capacitor; the lower plate of the high voltage capacitor is connected to the contact electrode; the contact electrode is arranged inside the liquid medicine pipeline and close to the nozzle, and is in direct contact with the spray liquid flow; an induction charging electric field is formed between the upper plate of the high voltage capacitor and the spray liquid flow. The electrostatic spray ultra-high voltage induction charging device of the present invention can use a larger voltage to induction charge the spray liquid flow, thereby increasing the charging capacity of the droplets; in addition, the electrostatic spray ultra-high voltage induction charging device can effectively prevent the droplets from being reversely attracted to the induction electrode and wetting the nozzle, thereby improving the stability of charging.

Description

Technical Field

[0001] The present invention relates to the field of agricultural plant protection, and in particular to an electrostatic spray ultra-high voltage induction charging device with a capacitor placed in front. Background Art

[0002] Electrostatic spraying of pesticide liquids is a common and highly effective method of plant protection. Its core lies in enhancing the deposition and coating effect of droplets on plant surfaces through electrostatic force.

[0003] like Figure 2 As shown in the figure, in traditional electrostatic spray systems, induction electrodes are typically placed in the area where the spray stream emerges or is initially atomized, charging the droplets through an induced electric field. Specifically, the induction electrode and the spray stream form a capacitor-like structure, with the induction electrode serving as the upper plate, the spray stream as the lower plate, and air as the insulating medium between them. This creates an electrostatic induced charging field, causing the droplets to carry a charge of the opposite polarity to that of the induction electrode.

[0004] However, this post-capacitor method (i.e., the spray stream is atomized first and then charged) has the following inherent limitations:

[0005] First, if the distance between the sensing electrode and the spray liquid flow is far, the induced electric field strength will be significantly attenuated; according to Coulomb's law, the electric field force is inversely proportional to the square of the distance, so as the distance increases, the liquid induced electric field strength will be significantly weakened, and the weaker induced electric field will have less attraction to the charges in the spray liquid flow, resulting in the inability to effectively separate the polarized positive and negative charges in the spray liquid flow, thereby reducing the charge of the droplets and weakening the deposition efficiency of the electrostatic spray.

[0006] Secondly, if the sensing electrode is too close to the nozzle, a higher voltage must be applied to ensure effective charging, which will increase the induced electric field strength between the spray liquid flow and the sensing electrode. As a result, under the action of the induced electric field, the molecules in the air medium will be ionized, turning the originally insulating air medium into a conductive channel, which can easily cause the air medium to break down under the action of the strong induced electric field. After the air medium is broken down, the insulation performance is lost, forming a local conductive channel, which causes the electric field to be distorted. After being charged, the droplets carry a charge with the opposite polarity to the sensing electrode, so they will be subject to a strong reverse Coulomb attraction. Under the action of this reverse Coulomb attraction, they are attracted back to the surface of the sensing electrode and flow along the sensing electrode, eventually wetting the nozzle.

[0007] As the nozzle surface is wetted by droplets, the local electric field becomes further distorted, making the electric field distribution near the nozzle uneven. This makes the charging process of the spray flow unstable, seriously reducing the consistency and reliability of charging. At the same time, the droplets lose some charge during the process of reverse Coulomb attraction and contact with the sensing electrode, resulting in a decrease in the charge-to-mass ratio of the droplets, ultimately affecting the charge intensity, atomization quality, and deposition uniformity of the droplets.

[0008] In summary, due to problems such as limited electric field strength, easy breakdown of the air medium, and reverse attraction of droplets to wet the nozzle, the traditional inductive charging method can usually only use a charging voltage of about 1-8kV, which cannot fully improve the charging capacity of the droplets. This limits the further improvement of the effect of electrostatic spraying technology. Summary of the Invention

[0009] In order to overcome the shortcomings of the existing technology, the present invention provides an electrostatic spray ultra-high voltage induction charging device with a capacitor in front. The electrostatic spray ultra-high voltage induction charging device can use a larger voltage to inductively charge the spray liquid flow, thereby increasing the charging capacity of the droplets; in addition, the electrostatic spray ultra-high voltage induction charging device can effectively prevent the droplets from being reversely attracted to the induction electrode and wetting the nozzle, thereby improving the stability of the charging.

[0010] The technical solution of the present invention to solve the above technical problems is:

[0011] A capacitor-fronted electrostatic spray ultra-high voltage induction charging device comprises a spray system, an electrostatic generator, a high-voltage capacitor and a contact electrode, wherein the electrostatic generator is connected to the upper plate of the high-voltage capacitor to provide electrostatic high voltage to the upper plate of the high-voltage capacitor; the lower plate of the high-voltage capacitor is connected to the contact electrode; the contact electrode is arranged inside the liquid medicine pipeline in the spray system and close to the nozzle of the spray system, and is in direct contact with the spray liquid flow; an induction charging electric field is formed between the upper plate of the high-voltage capacitor and the spray liquid flow.

[0012] Preferably, the spray system includes a liquid storage tank, a diaphragm pump and a nozzle, wherein the liquid storage tank, the diaphragm pump and the nozzle are connected through the liquid medicine pipeline; the liquid storage tank is used to store the liquid medicine; and the diaphragm pump is used to transport the liquid medicine through the liquid medicine pipeline to the nozzle for atomization.

[0013] Preferably, the distance between the contact electrode and the nozzle is less than or equal to 1 cm.

[0014] Preferably, the contact electrode adopts an annular structure, and the contact electrode is coaxially arranged with the liquid medicine pipeline.

[0015] Preferably, the contact electrode is made of brass.

[0016] Preferably, a solid insulating medium is provided in the high voltage capacitor.

[0017] Preferably, the solid insulating medium includes ceramic or epoxy resin.

[0018] Preferably, the positive electrode of the electrostatic generator is connected to the upper plate of the high-voltage capacitor, and the negative electrode is grounded.

[0019] Preferably, the electrostatic generator provides electrostatic high voltage to the upper plate of the high-voltage capacitor to cause the upper plate of the high-voltage capacitor to be positively charged, while the lower plate of the high-voltage capacitor is negatively charged. Under the polarization separation effect of electrostatic induction, the conductive ions in the spray liquid flow undergo directionally migration to cause the spray liquid flow to be negatively charged before it is atomized.

[0020] Preferably, the directional migration direction of the conductive ions is: the negative charges in the spray liquid flow gather near the nozzle and the contact electrode to cause the spray liquid flow near the nozzle and the contact electrode to be negatively charged; the positive charges in the spray liquid flow move in the direction away from the nozzle and the contact electrode to cause the spray liquid flow away from the nozzle and the contact electrode to be positively charged.

[0021] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0022] 1. The upper plate of the high-voltage capacitor in the electrostatic spray ultra-high voltage induction charging device of the present invention is connected to the upper plate of the electrostatic generator, and the lower plate is connected to the contact electrode, and the high-voltage capacitor adopts an insulating medium with better insulation capability, thereby preventing the high-voltage capacitor from being broken down by high voltage; based on the high-voltage resistance characteristics of the high-voltage capacitor, the electrostatic spray ultra-high voltage induction charging device of the present invention can use a voltage of 10-40kV or even higher to inductively charge the spray liquid flow, thereby enhancing the charging capacity of the droplets, and thus helping to improve the electrostatic spray charging and coverage effects.

[0023] 2. The electrostatic spray ultra-high voltage induction charging device of the present invention adopts a capacitor (induced electric field) pre-placement method, so that the spray liquid flow can be negatively charged before being atomized. When the liquid flows through the area of the contact electrode, it is only affected by the electrostatic field induced by the upper plate of the high-voltage capacitor. Therefore, the droplets can obtain a stable negative charge (the upper plate is positive). When the spray liquid flow is naturally ejected outward, no reverse attraction occurs. At the same time, because the droplets themselves have obtained a strong charge, this is conducive to enhancing the subsequent deposition effect, thereby effectively preventing the droplets from being reversely attracted to the induction electrode and wetting the nozzle, thereby improving the stability of the charging.

[0024] 3. The electrostatic spray ultra-high voltage induction charging device of the present invention arranges the contact electrode inside the liquid medicine pipeline and close to the nozzle, ensuring the effective separation of positive and negative charges in the solution and the effectiveness of droplet charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the electrostatic spray ultra-high voltage induction charging device of the present invention.

[0026] Figure 2 Schematic diagram of the structure of a traditional induction charging device.

[0027] In the figure: 1. Liquid storage tank; 2. Diaphragm pump; 3. Liquid pipeline; 4. Nozzle; 5. Electrostatic generator; 6. High-voltage capacitor; 7. Contact electrode; 8. Spray liquid flow; 9. Sensing electrode. DETAILED DESCRIPTION

[0028] The present invention will be described in further detail below with reference to the embodiments and drawings, but the embodiments of the present invention are not limited thereto.

[0029] See also Figure 1 The capacitor-front electrostatic spray ultra-high voltage induction charging device of the present invention comprises a spray system, an electrostatic generator 5, a high-voltage capacitor 6 and a contact electrode 7, wherein:

[0030] The spray system includes a liquid storage tank 1, a diaphragm pump 2 and a nozzle 4, wherein the liquid storage tank 1, the diaphragm pump 2 and the nozzle 4 are connected through the liquid medicine pipeline 3; the liquid storage tank 1 is used to store liquid medicine; the diaphragm pump 2 is used to transport the liquid medicine through the liquid medicine pipeline 3 to the nozzle 4 for atomization;

[0031] The electrostatic generator 5 is connected to the upper plate of the high-voltage capacitor 6 to provide electrostatic high voltage to the upper plate of the high-voltage capacitor 6, and the negative electrode is grounded; the high-voltage capacitor 6 has a reliable insulating medium to prevent the upper plate and the lower plate of the high-voltage capacitor 6 from being broken down by high voltage, and the lower plate of the high-voltage capacitor 6 is connected to the contact electrode 7; the contact electrode 7 is arranged inside the liquid medicine pipeline 3 in the spray system and close to the nozzle 4 of the spray system, and is in direct contact with the spray liquid flow 8 to attract the charge in the spray liquid flow 8 with the opposite polarity to the upper plate of the high-voltage capacitor 6, so that when the spray liquid flow 8 is atomized to generate droplets, it carries the charge with the opposite polarity to the upper plate of the high-voltage capacitor 6, completing the droplet charging process;

[0032] An induced charging electric field is formed between the upper plate of the high-voltage capacitor 6 and the spray liquid flow 8 .

[0033] In this embodiment, the contact electrode 7 must be installed in a position close to the nozzle 4, and the distance is generally preferably within 1 cm; according to the polarization separation principle in induced charging: the formed induced charging electric field will attract charges of opposite polarity to be enriched at the nozzle 4, and charges of the same polarity will diffuse along the liquid pipeline 3 toward the liquid storage tank 1 due to the repulsive effect; therefore, the contact electrode 7 must not be placed at a position away from the nozzle 4 or throughout the entire liquid pipeline 3. For example, the contact electrode 7 extends along the conveying direction of the liquid pipeline 3 or extends in the opposite direction. In this way, the flow path of the spray liquid flow 8 is long and the flow is turbulent, which causes the positive and negative charges to mix again, resulting in the failure of polarization separation, and then the inability to effectively separate the positive and negative charges, and the charging capacity is greatly reduced.

[0034] In addition, the electrostatic generator 5 can provide an electrostatic high voltage of up to 10-40kV or higher, depending on the ability of the insulating medium in the high-voltage capacitor 6 to prevent high-voltage breakdown; wherein, the high-voltage capacitor 6 can be selected from the high-voltage capacitor 6 available on the market to achieve high-voltage breakdown protection within the range of 10-50kV; or a high-voltage capacitor 6 can be designed separately to increase the voltage application range of the electrostatic generator 5.

[0035] In this embodiment, the insulating medium of the high-voltage capacitor 6 can be ceramic, epoxy resin, etc., so even if an ultra-high voltage (such as 40-60 kV) is applied, the insulating medium will not break down.

[0036] In addition, the structure and material of the contact electrode 7 can be optimized, such as adopting a ring structure, brass material, etc., to facilitate fixation inside the drug liquid pipeline 3 and increase the contact area between the electrode and the drug liquid.

[0037] See also Figure 1 The working principle of the capacitor-front electrostatic spray ultra-high voltage induction charging device of the present invention is:

[0038] During operation, the electrostatic generator 5 provides electrostatic high voltage to the upper plate of the high-voltage capacitor 6. The lower plate of the high-voltage capacitor 6 is connected to the contact electrode 7 provided inside the liquid medicine pipeline 3 and near the nozzle 4. The contact electrode 7 is in direct contact with the spray liquid flow 8 in the liquid medicine pipeline 3. Under the action of the electrostatic field, the upper plate of the high-voltage capacitor 6 has a certain electrical property (such as "+" charge), and the lower plate of the high-voltage capacitor 6 has a "-" charge. Under the polarization separation effect of electrostatic induction, the conductive ions in the spray liquid flow 8 undergo directional migration, wherein, The negative charges in the spray liquid flow 8 are gathered near the nozzle 4 and the contact electrode 7, so as to cause the spray liquid flow 8 near the nozzle 4 and the contact electrode 7 to be charged with a "-" charge, and the positive charges in the spray liquid flow 8 move in the direction away from the nozzle 4 and the contact electrode 7, so as to cause the spray liquid flow 8 away from the nozzle 4 and the contact electrode 7 to be charged with a "+" charge; in this way, the spray liquid flow 8 can be charged with a "-" charge before it is atomized, so that when the spray liquid flow 8 at the nozzle 4 is atomized to generate droplets, the droplets are charged with a "-" charge, thereby completing the charging process of the droplets.

[0039] During the above process, the contact electrode 7 must be placed near the nozzle 4, rather than through the liquid medicine pipeline 3 or the liquid storage tank 1. The proximity of the contact electrode 7 to the nozzle 4 allows the polarization separation of the final section of the spray liquid stream 8 before injection to occur directly in the strong electric field. Because the velocity of the spray liquid stream 8 near the nozzle 4 gradually accelerates and contracts, a complete and stable positive and negative charge separation structure is easily formed there. After the spray liquid stream 8 is ejected from the nozzle 4, the charged droplets instantly break away from the liquid column, effectively avoiding reverse attraction.

[0040] At this time, if the contact electrode 7 runs through the entire liquid medicine pipeline 3 or is set inside the liquid storage tank 1, the positive and negative charges will be mixed again due to the long path and turbulent flow of the spray liquid flow 8, the polarization separation will fail, and the charging capacity will be greatly reduced.

[0041] See also Figure 2 Compared to the traditional post-capacitor method, an induced charging electric field (capacitor electric field) is formed between the induction electrode 9 and the spray liquid stream 8. If the distance between the two is too far, the charging effect will be poor, and if the distance between the two is too close, the charging voltage will be limited. If the voltage is too high, the charged droplets will be attracted to the induction electrode 9 and wet the nozzle 4, causing the induction charging to begin to transition to contact charging. This makes the charging process unstable and the overall charging effect worse, reducing the charge-to-mass ratio of the droplets. This has been documented in existing research papers. Therefore, due to this limitation, traditional induction-charged electrostatic spray devices can generally only use a charging voltage of 1-8kV, which seriously affects the further improvement of charging efficiency.

[0042] In addition, in traditional induction charging, the air between the induction electrode 9 and the spray liquid flow 8 is used as an insulating medium, but when the voltage is too high, the air will be broken down; in the present invention, since the high-voltage capacitor 6 contains a reliable insulating medium, the insulating medium breakdown caused by excessive voltage can be avoided, so a higher charging voltage can be used to improve the charging capacity.

[0043] In summary, the present invention utilizes a system solution that uses a capacitor in front (charging first and then atomization), a high-voltage resistant insulating medium instead of an air medium, and a contact electrode 7 arranged close to the nozzle 4. This system solution can effectively solve the problems of droplets being attracted in the opposite direction and the air medium being broken down by high voltage in traditional inductive charging methods, and increases the charging voltage threshold, thereby helping to improve the inductive charging effect.

[0044] Finally, the present invention significantly improves the insulation withstand voltage performance by introducing a high-voltage capacitor 6 between the electrostatic generator 5 and the contact electrode 7, and adopts the solid insulating medium in the high-voltage capacitor 6 instead of the air medium used in the traditional induction charging method, effectively avoiding the occurrence of dielectric breakdown under high-voltage electric fields. Because the induced electric field is constructed by the high-voltage capacitor 6, the contact electrode 7 and the spray liquid flow 8 are isolated from the potential, thereby preventing the negatively charged droplets from being reversely attracted to the surface of the induction electrode, avoiding the nozzle 4 from being wetted and the electric field distortion, thereby significantly improving the stability of the droplet charging and the reliability of the spray system, allowing the induction charging to operate stably at higher voltages and enhancing the operation effect of the electrostatic spray.

[0045] The above are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above contents. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention should be equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. An electrostatic spray ultra-high voltage induction charging device with a capacitor in front, characterized in that: The invention comprises a spray system, an electrostatic generator, a high-voltage capacitor, and a contact electrode, wherein the electrostatic generator is connected to the upper plate of the high-voltage capacitor to provide electrostatic high voltage to the upper plate of the high-voltage capacitor; the lower plate of the high-voltage capacitor is connected to the contact electrode; the contact electrode is arranged inside the liquid medicine pipeline of the spray system and close to the nozzle of the spray system, and is in direct contact with the spray liquid flow; an induced charging electric field is formed between the upper plate of the high-voltage capacitor and the spray liquid flow; The electrostatic generator provides electrostatic high voltage to the upper plate of the high-voltage capacitor, causing the upper plate of the high-voltage capacitor to be positively charged, while the lower plate of the high-voltage capacitor is negatively charged. Under the polarization separation effect of electrostatic induction, the conductive ions in the spray liquid flow undergo directionally migration, causing the spray liquid flow to be negatively charged before it is atomized. The directional migration direction of the conductive ions is: the negative charges in the spray liquid flow gather near the nozzle and the contact electrode to cause the spray liquid flow near the nozzle and the contact electrode to be negatively charged; the positive charges in the spray liquid flow move in the direction away from the nozzle and the contact electrode to cause the spray liquid flow away from the nozzle and the contact electrode to be positively charged.

2. The capacitor-fronted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The spray system includes a liquid storage tank, a diaphragm pump and a nozzle, wherein the liquid storage tank, the diaphragm pump and the nozzle are connected through the liquid medicine pipeline; the liquid storage tank is used to store liquid medicine; the diaphragm pump is used to transport the liquid medicine through the liquid medicine pipeline to the nozzle for atomization.

3. The capacitor-fronted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The distance between the contact electrode and the nozzle is less than or equal to 1 cm.

4. The capacitor-fronted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The contact electrode adopts an annular structure and is coaxially arranged with the liquid medicine pipeline.

5. The capacitor-pre-mounted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The contact electrodes are made of brass.

6. The capacitor-fronted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The high voltage capacitor is provided with a solid insulating medium.

7. The capacitor-pre-mounted electrostatic spray ultra-high voltage induction charging device according to claim 6, characterized in that: The solid insulating medium includes ceramic or epoxy resin.

8. The capacitor-pre-mounted electrostatic spray ultra-high voltage induction charging device according to claim 1, characterized in that: The positive electrode of the electrostatic generator is connected to the upper plate of the high-voltage capacitor, and the negative electrode is grounded.

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