A large flow electrostatic atomization device

Abstract

The application discloses a large-flow electrostatic atomization device, which comprises a double-layer electrode plate, a groove box, a supporting rod, a liquid storage box and a peristaltic pump, wherein the double-layer electrode plate comprises a microporous sheet and a metal shielding electrode plate, the metal shielding electrode plate is provided with through holes, and the through holes correspond to the holes on the microporous sheet one by one; the liquid storage box is connected with a liquid injection unit; the microporous sheet is immersed in a circular shallow groove box; and the metal shielding electrode plate is connected with a negative high-voltage direct-current power supply; the microporous sheet is connected with a negative high-voltage direct-current power supply with a higher voltage than the metal shielding electrode plate; the device uses the dense small holes of the microporous sheet to greatly increase the atomization flow; the double-layer electrode plate can effectively eliminate the voltage edge effect between adjacent channels and enhance the stability of the atomized jet flow; and the application efficiency of the electrostatic atomization in multiple fields can be expanded.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of electrostatic atomization, and particularly relates to a large-flow electrostatic atomization device. BACKGROUND

[0002] Electrosprays (ES for short) is a new type of atomization technology based on the theory of charged multiphase flow, which is a charged droplet atomization mass transfer process with gas phase as the continuous phase. With the advantage of low energy consumption (milliwatt level), a large number of fine (nanoscale spray under certain control conditions), monodisperse (narrow droplet size spectrum, high uniformity of particle size), controllable (through electric field control to form a special charged two-phase flow), and high deposition rate (easily penetrate the surrounding gas medium and easily adsorb) charged microdroplets can be obtained. In today's industrial and agricultural fields such as pesticide spraying, industrial spraying, industrial dust removal and desulfurization, and particle coalescence separation, ES has been widely used.

[0003] In recent years, the research and application of ES mainly focuses on the multi-jet mode, because in this mode the flow supply can be greatly improved, thereby improving the production efficiency. The multi-jet mode is composed of multiple single-cone jets. Although this mode solves the problem of atomization flow of cone jets, it still has the defect that each single jet influences each other and is difficult to maintain stability. Therefore, the multi-jet mode still cannot make ES widely applied in many fields. SUMMARY

[0004] According to the deficiencies and shortcomings of the prior art, the present application provides a large-flow electrostatic atomization device. The array micro-hole thin plate is designed to replace the capillary tube in the traditional electrostatic atomization device, which not only increases the atomization flow but also solves the problem of capillary tube blockage. At the same time, the double-layer electrode plate of the device can effectively eliminate the voltage edge effect between adjacent channels, thereby enhancing the stability of the atomized jet. In addition, since the array micro-hole thin plate of the device is immersed in the circular shallow groove box, it does not require very strict flow supply, thereby reducing the cost of the liquid injection device.

[0005] The technical scheme adopted by the present application is as follows:

[0006] A large-flow electrostatic atomization device, comprising:

[0007] a liquid storage tank,

[0008] a metal shielding electrode plate arranged at the upper surface of the liquid storage tank, wherein through holes arranged in an array are formed on the metal shielding electrode plate; and the metal shielding electrode plate is connected to a negative high-voltage direct-current power supply.

[0009] A metal ground electrode plate is arranged above the metal shielding electrode plate, and the metal ground electrode plate is grounded.

[0010] A microporous sheet is arranged below the metal shielding electrode plate, and the microporous sheet is provided with through holes arranged in an array and corresponding to the through holes on the metal shielding electrode plate; the upper surface of the microporous sheet and the wall surface of the through holes of the microporous sheet are subjected to hydrophobic treatment; the microporous sheet is connected to a negative high-voltage direct-current power supply; and the negative high-voltage direct-current power supply connected to the microporous sheet is higher than the negative high-voltage direct-current power supply connected to the metal shielding electrode plate.

[0011] A groove box is arranged below the metal shielding electrode plate, and the groove box is connected to the liquid storage box 5 through a pump, and the bottom of the microporous sheet is submerged in the groove box.

[0012] Further, the microporous sheet is a circular plate with a diameter of 50 mm and a thickness of 0.5 mm, and the inside of the microporous sheet is provided with circular through holes arranged in an array, and the diameter of the circular through holes is 0.5 mm, and the distance between the centers of adjacent through holes is 3 mm.

[0013] Further, the microporous sheet is connected to an 8kv negative high-voltage direct-current power supply.

[0014] Further, the groove box is in the shape of a cylinder, and further, the upper edge portion of the groove box is provided with sawtooth-shaped drainage grooves, the distance from the groove bottom of the drainage grooves to the microporous sheet is 0.4 mm, and the drainage grooves are distributed at an angle of 30°.

[0015] Further, the liquid storage box is in the shape of a cylinder, and the material of the liquid storage box is nylon.

[0016] Further, the metal shielding electrode plate is in the shape of a circle with a diameter of 50 mm and a thickness of 0.5 mm, and the diameter of the through holes on the metal shielding electrode plate is 2 mm.

[0017] Further, the distance between the microporous sheet and the metal shielding electrode plate is 3 mm, and the materials of the microporous sheet and the metal shielding electrode plate are both red copper.

[0018] Further, the metal shielding electrode plate is connected to a 2kv negative high-voltage direct-current power supply.

[0019] Further, nylon is used to connect the metal ground electrode plate, the metal shielding electrode plate and the microporous sheet, and to connect the groove box and the liquid storage box.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. Because the microporous thin plate used in this device is immersed in the liquid surface, the circular holes, after hydrophobic treatment, automatically form an arc-shaped liquid cone using the surface tension of the liquid. This eliminates the need for expensive injection equipment such as syringe pumps, significantly reducing costs. Furthermore, since capillary drainage is not used, problems such as capillary blockage are fundamentally solved.

[0022] 2. To address the edge effect between adjacent through-holes in microporous thin plates, this device employs a double-layer electrode plate design. This device is simple to assemble, inexpensive, and exhibits high atomization stability.

[0023] 3. By adjusting the number of through holes on the microporous thin plate, different atomization flow rates can be obtained. Compared with traditional cone jets and multi-jet jets, it has the advantage of wide atomization flow rate adjustment and can be adapted to various production environments.

[0024] 4. Compared with the low flow rate of 1 to 10 μL / min of traditional electrostatic atomizing devices, the atomizing flow rate of this device can reach 1 mL to 10 mL / min, which is 2 to 3 orders of magnitude higher. Moreover, it can maintain the monodispersity of the atomized beam while atomizing at a high flow rate, which has obvious advantages. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of a high-flow electrostatic atomization device according to the present invention;

[0026] Figure 2 This is a two-dimensional structural schematic diagram of the microporous thin plate in this invention;

[0027] Figure 3 This is a two-dimensional structural schematic diagram of the metal shielding electrode plate in this invention;

[0028] Figure 4 This is a schematic diagram of the operation of the double-layer electrode plate in this invention;

[0029] Figure 5 This is a three-dimensional schematic diagram of the circular shallow groove box in this invention.

[0030] In the diagram, 1. Microporous thin plate, 2. Metal shielded electrode plate, 3. Groove box, 4. Support rod, 5. Liquid storage tank, 6. Peristaltic pump, 7. Metal ground electrode plate, 8. Support rod, 9. Water inlet, 10. Drainage channel, 11. Ground electrode, 12. -2kV DC power supply, 13. -8kV DC power supply Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the invention.

[0032] A high-flow electrostatic atomizing device, such as Figure 1 As shown, the system includes a microporous plate 1, a metal shielding electrode plate 2, a grooved box 3, a support rod 4, a liquid storage tank 5, a peristaltic pump 6, a metal ground electrode plate 7, a support rod 8, and a water inlet 9. The metal shielding electrode plate 2 has through holes, which correspond one-to-one with the holes on the microporous plate 1. The metal ground electrode plate 7 is connected to the liquid storage tank via a nylon support rod. The liquid storage tank 5 is connected to a liquid injection unit. The microporous plate 1 is immersed in the circular shallow grooved box 3, which is placed on the support rod 4, suspending it in the liquid storage tank 5. Liquid in the liquid storage tank 5 is pumped into the grooved box 3 by the peristaltic pump 6. Excess liquid in the grooved box 3 flows back into the liquid storage tank 5 through a serrated drainage channel 10, thus forming a liquid circulation system.

[0033] Microporous thin plate 1 Figure 2 As shown, the outer surface of the microporous plate is circular with a diameter of 50 mm and a thickness of 0.5 mm. The inner surface consists of an array of circular through-holes with a diameter of 0.5 mm, and the center-to-center distance between each through-hole is 3 mm. Furthermore, the upper surface of the microporous plate 1 and the interior of each through-hole on the microporous plate 1 are treated with hydrophobicity to allow the liquid inside the through-hole to form a meniscus.

[0034] like Figure 4 The metal shielding electrode plate 2 is circular in shape with a diameter of 50 mm and a thickness of 0.5 mm, and the diameter of a single through hole is 2 mm.

[0035] like Figure 5 To increase the stability of the atomized droplets and resist external disturbances, a double-layer electrode plate design was adopted. The distance between the microporous thin plate 1 and the metal shielding electrode plate 2 is 3mm, and the distance between the metal shielding electrode plate 2 and the metal ground electrode plate 7 is 20mm. The through holes on the metal shielding electrode plate 2 correspond one-to-one with the through holes on the microporous thin plate 1. The metal shielding electrode plate 2 is connected to a 2kV negative high-voltage DC power supply, and the microporous thin plate 1 is connected to an 8kV negative high-voltage DC power supply.

[0036] The working process of this invention will be further explained below:

[0037] Using ethanol as the atomizing medium, the ethanol is loaded into a syringe, and the flow rate is adjusted to 20 ml / h before being injected into the liquid storage tank 5. When the liquid to be atomized fills the circular shallow groove tank 3 and forms a meniscus on the upper surface of the microporous thin plate 1, two DC voltage sources are turned on. The meniscus emits a jet, which is further broken into small droplets under the action of the double-layer electrode plate, thus obtaining a large number of sustainable, monodisperse, and highly controllable atomized droplets.

[0038] If the control of the atomization flow is needed, the number of the through holes on the array micro-hole sheet 1 and the matched metal shielding electrode plate 2 are changed.

[0039] During the whole process, the upper surface of the through hole is treated with hydrophobicity, the formation of the meniscus is completely controlled by the surface tension of the liquid, and the self-regulation ability is good, and the design of the double-layer electrode plate also makes the jet emitted by the meniscus have better stability.

[0040] The above examples are only used to illustrate the design idea and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and to implement it, and the protection scope of the present application is not limited to the above examples. Therefore, any equivalent changes or modifications made according to the principles and design ideas disclosed by the present application are within the protection scope of the present application.

Claims

1. A large flow rate electrostatic atomization device, characterized by, The utility model relates to a liquid atomization device, comprising: a liquid storage tank (5), a metal shielding electrode plate (2) arranged on the upper surface of the liquid storage tank (5), the metal shielding electrode plate (2) being provided with through holes arranged in an array, and the metal shielding electrode plate (2) being connected to a negative high-voltage direct-current power supply; a metal ground electrode plate (7) arranged above the metal shielding electrode plate (2), the metal ground electrode plate (7) being connected to the ground; a microporous sheet (1) arranged below the metal shielding electrode plate (2), the microporous sheet (1) being provided with through holes arranged in an array and corresponding to the through holes of the metal shielding electrode plate (2), the upper surface of the microporous sheet (1) and the wall surface of the through holes of the microporous sheet (1) being subjected to hydrophobic treatment, the microporous sheet (1) being connected to a negative high-voltage direct-current power supply, the negative high-voltage direct-current power supply connected to the microporous sheet (1) being higher than the negative high-voltage direct-current power supply connected to the metal shielding electrode plate (2), the atomization flow being adjusted by adjusting the number of through holes on the microporous sheet (1), and the atomization flow being 1 mL to 10 mL / min. a groove tank (3) arranged below the metal shielding electrode plate (2), the groove tank (3) being connected to the liquid storage tank (5) by a pump, the bottom of the microporous sheet (1) being submerged in the groove tank (3), the liquid in the liquid storage tank (5) being input into the groove tank (3) by a peristaltic pump (6), and the excess liquid in the groove tank (3) being returned to the liquid storage tank (5) from a sawtooth-shaped drainage groove (10), thereby forming a liquid circulation system.

2. A high flow electrostatic atomization device according to claim 1, wherein, The microporous sheet (1) is a circular plate with a diameter of 50 mm and a thickness of 0.5 mm, and the internal part of the microporous sheet (1) is provided with circular through holes arranged in an array, the diameter of the circular through holes being 0.5 mm, and the distance between the centers of adjacent through holes being 3 mm.

3. A high flow electrostatic atomization device according to claim 2, wherein, The microporous sheet (1) is connected to an 8-kV negative high-voltage direct-current power supply.

4. A high flow rate electrostatic atomizer according to claim 1, 2 or 3, characterized in that The groove tank (3) is in the shape of a cylinder.

5. A high flow electrostatic atomization device according to claim 4, wherein The upper edge part of the groove tank (3) is provided with a sawtooth-shaped drainage groove (10), the distance from the groove bottom of the drainage groove (10) to the microporous sheet (1) being 0.4 mm, and the drainage groove being distributed at an angle of 30°.

6. A high flow electrostatic atomization device according to claim 4, wherein The liquid storage tank (5) is in the shape of a cylinder, and the material of the liquid storage tank is nylon.

7. A high flow electrostatic atomization device according to claim 4, wherein The metal shielding electrode plate (2) is in the shape of a circle with a diameter of 50 mm and a thickness of 0.5 mm, and the diameter of the through holes on the metal shielding electrode plate (2) is 2 mm.

8. A high flow electrostatic atomization device according to claim 7, wherein, The distance between the microporous sheet (1) and the metal shielding electrode plate (2) is 3 mm, and the materials of the microporous sheet (1) and the metal shielding electrode plate (2) are both purple copper.

9. A high flow electrostatic atomizer as defined in claim 8, wherein The metal shielding electrode plate is connected to a 2-kV negative high-voltage direct-current power supply.

10. A high flow electrostatic atomization device according to claim 1, wherein The metal ground electrode plate (7), the metal shielding electrode plate (2), and the microporous sheet (1) are connected by nylon, and the groove tank (3) and the liquid storage tank (5) are also connected by nylon.

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