An electrostatic adsorption component for cooking fumes and its preparation method

Abstract

This invention discloses an electrostatic adsorption component for oil fumes and its preparation method. The component includes a collecting electrode and a discharging electrode. The collecting electrode has a cylindrical structure with several layers and rows, while the discharging electrode has a rod-shaped structure. A discharging electrode is inserted into the inner cavity of each collecting electrode, and a self-cleaning layer is provided on the inner periphery of each collecting electrode and the outer periphery of each discharging electrode. The preparation method is as follows: Step 1, polishing the surfaces of the collecting and discharging electrodes; Step 2, etching the surfaces of the collecting and discharging electrodes; Step 3, dispersing with n-hexane; Step 4, sealing the tips of the discharge protrusions with wax; Step 5, spraying the surfaces of the collecting and discharging electrodes; Step 6, allowing the sprayed collecting and discharging electrodes to air dry. Beneficial effects: It can effectively improve the repellency of the electrostatic adsorption component for water and oil, further enhancing the dual-repellency effect. Integrating the discharge protrusions and the discharging electrode into a single structure increases its stability.

Description

Technical Field

[0001] This invention relates to an electrostatic adsorption component and its preparation method, and particularly to an electrostatic adsorption component for oil fumes and its preparation method. Background Technology

[0002] Cooking fumes contain a large number of harmful substances, polluting the atmosphere and harming human health. Traditional range hoods directly extract cooking fumes and other waste products, reducing indoor pollution but severely polluting the outdoor atmosphere. To address this problem, electrostatic adsorption range hoods have emerged. These hoods incorporate an electrostatic module, primarily composed of a discharge electrode and a collection electrode. The discharge tip of the discharge electrode generates a corona discharge under voltage, ionizing nearby air molecules into free electrons and positive ions. These electrons combine with airborne gases to form negative ions. These negative and positive ions then randomly collide with small solid particles and liquid droplets in the cooking fumes, forming charged particles. Under the influence of an applied electric field, these particles move in the direction opposite to their polarity, reaching the collection areas of the discharge and collection electrodes, thus purifying the cooking fumes. However, this leads to severe contamination in the collection areas of the collecting and discharging electrodes. Small solid particles and liquid droplets are deposited and adsorbed on the surfaces of these areas, forming grease and affecting the purification efficiency of the electrostatic range hood. This necessitates the regular disassembly and cleaning of the electrostatic module, significantly increasing the operating costs. Summary of the Invention

[0003] The main objective of this invention is to solve the problem of increased usage costs caused by the need for frequent cleaning of the collecting and discharging electrodes in existing electrostatic adsorption range hoods, and to provide an electrostatic adsorption component for oil fumes and its preparation method.

[0004] The electrostatic adsorption component for oil fumes provided by the present invention includes a collecting electrode and a discharging electrode. The collecting electrode has a cylindrical structure and is provided with several layers and rows. The discharging electrode has a rod-shaped structure. A discharging electrode is inserted into the inner cavity of each collecting electrode. A self-cleaning layer is provided on the inner periphery of each collecting electrode and the outer periphery of each discharging electrode.

[0005] Each cylindrical collector electrode has rounded corners at both ends.

[0006] Each rod-shaped discharge electrode has several rows of discharge protrusions arranged longitudinally at equal intervals. The discharge protrusions are an integral structure with the body of the discharge electrode. Each row of discharge protrusions has three or more evenly distributed around the periphery of the rod-shaped discharge electrode. A self-cleaning layer is also provided on the side wall of the discharge electrode of adjacent discharge protrusions. The two ends of the rod-shaped discharge electrode are set as hemispherical structures.

[0007] The self-cleaning layer has a dual-layer structure, consisting of a micro-nano etched layer and a superhydrophobic layer. The micro-nano etched layer is the inner layer, and the superhydrophobic layer is the outer layer. The dual-layer self-cleaning layer has the functions of self-cleaning, anti-fouling, and corrosion resistance.

[0008] The micro-nano etched layer is formed by acid etching, alkaline etching, salt solution etching, photolithography, or ion beam etching. The superbihydrophobic layer is formed by spraying or dip coating of organic, inorganic, or composite materials.

[0009] The method for preparing the electrostatic adsorption component for oil fumes provided by the present invention includes the following steps:

[0010] Step 1: Use 320-600 grit coarse sandpaper to polish the surfaces of the collecting electrode and the discharging electrode of the electrostatic adsorption component for oil fumes to a smooth finish.

[0011] Step 2: Etch the surface of the collecting electrode and the discharging electrode of the oil fume electrostatic adsorption component. Use 0.1wt% acetic acid, carbonic acid or other weak acid solution, ammonium monohydrate or other weak alkali solution or nickel chloride or cobalt chloride or other salt solution for immersion chemical etching, or use photolithography or ion beam etching to etch the surface of the collecting electrode and the discharging electrode.

[0012] Step 3: Prepare a superhydrophobic material suspension by mixing micron-sized polytetrafluoroethylene powder, octadecyltrichlorosilane and water in a molar ratio of 0.5:2:1, ultrasonically disperse for 10 minutes to ensure thorough mixing, let stand for 2 hours, and then add n-hexane for dispersion.

[0013] Step 4: Seal the tip of the discharge protrusion on the discharge electrode with wax;

[0014] Step 5: Use a spray gun to spray the suspension obtained in Step 3 onto the etched collecting electrode and discharging electrode surfaces, or directly immerse the etched collecting electrode and discharging electrode in the superhydrophobic material suspension obtained in Step 3 for 12 hours.

[0015] Step 6: Allow the coated collecting electrode and discharging electrode to air dry, or remove the submerged collecting electrode and discharging electrode from the solution, rinse with n-hexane, and allow to air dry.

[0016] The working principle of this invention is as follows:

[0017] The electrostatic adsorption component for oil fumes provided by this invention allows oil fumes to roll freely and fall off the surface of the device, achieving a stain-resistant effect. When the electrostatic range hood uses the electrostatic adsorption component provided by this invention, the charged oil fume particles move under the action of the electric field. The oil fumes accumulate in the cylindrical collecting electrode and rod-shaped discharging electrode areas, and under the action of gravity and lateral wind force, they detach from the electrostatic adsorption component and flow into the subsequent oil fume collection cup. The collecting electrode is composed of several cylindrical units arranged in dense layers and columns, with rounded corners at the front and rear ends of each cylindrical unit. This reduces the resistance when oil fumes enter the cylinder and makes it easier for the collected solid-liquid mixture to slide off and be collected.

[0018] Each collector electrode has a double-layer self-cleaning structure consisting of a micro / nano etched layer and a superhydrophobic layer on its inner periphery and outer periphery, respectively. The micro / nano etched layer is formed using acid etching, alkaline etching, salt solution etching, photolithography, or ion beam etching. This creates a relatively uniform micro / nano dual-scale structure on the inner periphery of the collector electrode and the outer periphery of the discharge electrode, increasing the specific surface area of ​​the collector and discharge electrodes. This allows droplets to form an air cushion at the interface when they contact the surfaces of the collector and discharge electrodes, which helps to increase the contact angle and improve the superhydrophobic performance. The superhydrophobic layer is composed of a superhydrophobic material and is prepared by spraying or dip coating. Coating the surface of the micro / nano etched layer with a superhydrophobic material effectively reduces the surface energy and further improves the superhydrophobic properties of the electrostatic module.

[0019] The rod-shaped discharge electrode has several discharge protrusions evenly spaced longitudinally. The discharge protrusions and the discharge electrode are integrated into a single structure, with rounded corners at the joint. The discharge protrusions undergo only micro-nano etching. This ensures the conductivity of the discharge protrusions, allowing the ionization process to occur normally. Simultaneously, adhesion is less likely to occur at the joint, ensuring smooth removal of oil fumes.

[0020] The beneficial effects of this invention are:

[0021] The electrostatic adsorption component for oil fumes and its preparation method provided by this invention can effectively improve the repellency of the electrostatic adsorption component for water and oil by performing surface treatment on the component. This allows the charged solid-liquid mixture that moves to the rod-shaped region of the collecting electrode and the discharging electrode under the action of an electric field to reach a super-dual-hydrophobic state on the component surface, thereby generating a self-cleaning phenomenon. The dual-hydrophobic effect can be further improved by combining the micro-nano etched layer and the super-dual-hydrophobic layer.

[0022] The discharge protrusion and rod-shaped discharge electrode are integrated into a single structure to increase stability. Drawing inspiration from the connection between thorns or rose thorns and rods, the joint between the discharge protrusion and the rod-shaped discharge electrode is rounded to prevent the solid-liquid mixture from adhering at the joint. Attached Figure Description

[0023] Figure 1This is a schematic diagram of the overall structure of the electrostatic adsorption component for oil fumes described in this invention.

[0024] Figure 2 This is a partial cross-sectional structural diagram of the electrostatic adsorption component for oil fumes described in this invention.

[0025] Figure 3 This is a schematic diagram of the longitudinal cross-sectional structure of the discharge electrode described in this invention.

[0026] Figure 4 This is a schematic diagram of the transverse cross-sectional structure of the discharge electrode described in this invention.

[0027] The annotations in the image above are as follows:

[0028] 1. Collector electrode 2. Discharge electrode 3. Micro / nano etched layer 4. Superbihydrophobic layer

[0029] 5. Discharge protrusion. Detailed Implementation

[0030] Please see Figures 1 to 4 As shown:

[0031] The electrostatic adsorption component for oil fumes provided by the present invention includes a collecting electrode 1 and a discharging electrode 2. The collecting electrode 1 has a cylindrical structure and is provided with several layers and rows. The discharging electrode 2 has a rod-shaped structure. A discharging electrode 2 is inserted into the inner cavity of each collecting electrode 1. A self-cleaning layer is provided on the inner periphery of each collecting electrode 1 and the outer periphery of each discharging electrode 2.

[0032] Each cylindrical collector electrode 1 has rounded corners at both ends.

[0033] Each rod-shaped discharge electrode 2 has several discharge protrusions 5 arranged longitudinally at equal intervals. The discharge protrusions 5 are integral with the body of the discharge electrode 2. Each row of discharge protrusions 5 is set to four, and the four discharge protrusions 5 are arranged symmetrically in pairs. A self-cleaning layer is also provided on the side wall of the discharge electrode 2 of adjacent discharge protrusions 5. The two ends of the rod-shaped discharge electrode 2 are set to hemispherical structures.

[0034] The self-cleaning layer has a double-layer structure, consisting of a micro-nano etched layer 3 and a super-hydrophobic layer 4. The micro-nano etched layer 3 is the inner layer, and the super-hydrophobic layer 4 is the outer layer. The double-layer self-cleaning layer has the functions of self-cleaning, anti-fouling and corrosion resistance.

[0035] The micro-nano etched layer 3 is formed by acid etching, alkaline etching, salt solution etching, photolithography, or ion beam etching. The superbihydrophobic layer 4 is formed by spraying or dipping organic materials, inorganic materials, or composite materials.

[0036] The method for preparing the electrostatic adsorption component for oil fumes provided by the present invention includes the following steps:

[0037] Step 1: Use 320-600 grit coarse sandpaper to polish the surfaces of the collecting electrode 1 and the discharging electrode 2 of the oil fume electrostatic adsorption component until they are shiny.

[0038] Step 2: Perform surface etching on the collecting electrode 1 and discharging electrode 2 of the oil fume electrostatic adsorption component. Use 0.1wt% acetic acid, carbonic acid or other weak acid solution, ammonium monohydrate or other weak alkali solution or nickel chloride or cobalt chloride or other salt solution for immersion chemical etching, or use photolithography or ion beam etching to etch the surface of the collecting electrode 1 and discharging electrode 2.

[0039] Step 3: Prepare a superhydrophobic material suspension by mixing micron-sized polytetrafluoroethylene powder, octadecyltrichlorosilane and water in a molar ratio of 0.5:2:1, ultrasonically disperse for 10 minutes to ensure thorough mixing, let stand for 2 hours, and then add n-hexane for dispersion.

[0040] Step 4: Seal the tip of the discharge protrusion 5 on the discharge electrode 2 with wax;

[0041] Step 5: Use a spray gun to spray the suspension obtained in step 3 onto the etched surfaces of the collecting electrode 1 and the discharging electrode 2, or directly immerse the etched collecting electrode 1 and the discharging electrode 2 in the superhydrophobic material suspension obtained in step 3 for 12 hours.

[0042] Step 6: Allow the coated collecting electrode 1 and discharging electrode 2 to air dry, or remove the submerged collecting electrode 1 and discharging electrode 2 from the solution, rinse with n-hexane, and allow to air dry.

[0043] The working principle of this invention is as follows:

[0044] The electrostatic adsorption component for oil fumes provided by this invention allows oil fumes to roll freely and fall off the surface of the device, achieving a stain-resistant effect. When the electrostatic range hood uses the electrostatic adsorption component provided by this invention, the charged oil fume particles move under the action of the electric field. The oil fumes accumulate in the area of ​​the cylindrical collecting electrode 1 and the rod-shaped discharging electrode 2, and under the action of gravity and lateral wind force, they detach from the electrostatic adsorption component and flow into the subsequent oil fume collection cup. The collecting electrode 1 is composed of several cylindrical units arranged in dense layers and columns, with rounded corners at the front and rear ends of each cylindrical unit. This reduces the resistance when oil fumes enter the cylinder and makes it easier for the collected solid-liquid mixture to slide off and be collected.

[0045] Each collector electrode 1 and the discharge electrode 2 has a double-layer self-cleaning layer consisting of a micro / nano etched layer 3 and a superhydrophobic layer 4 on its inner periphery and outer periphery, respectively. The micro / nano etched layer 3 is formed by acid etching, alkaline etching, salt solution etching, photolithography, or ion beam etching. This creates a relatively uniform micro / nano dual-scale structure on the inner periphery of the collector electrode 1 and the outer periphery of the discharge electrode 2, increasing the specific surface area of ​​the collector electrode 1 and the discharge electrode 2. This allows droplets to form an air cushion at the interface when they contact the surfaces of the collector electrode 1 and the discharge electrode 2, which helps to increase the contact angle and improve the superhydrophobic performance. The superhydrophobic layer 4 is composed of a superhydrophobic material and is prepared by spraying or dip coating. Coating the surface of the micro / nano etched layer 3 with a superhydrophobic material to form the superhydrophobic layer 4 effectively reduces the surface energy and further improves the superhydrophobic properties of the electrostatic module.

[0046] The rod-shaped discharge electrode 2 has several discharge protrusions 5 evenly spaced longitudinally. The discharge protrusions 5 and the discharge electrode 2 are an integral structure with rounded corners at the joint. The discharge protrusions 5 are only subjected to micro-nano etching. This ensures the conductivity of the discharge protrusions, allowing the ionization process to occur normally. At the same time, it prevents adhesion at the joint, ensuring that oil fumes can be easily removed.

Claims

1. An electrostatic adsorption component for cooking fumes, characterized in that: It includes a collecting electrode and a discharging electrode. The collecting electrode has a cylindrical structure and is provided with several layers and rows. The discharging electrode has a rod-shaped structure. The rod-shaped discharging electrode is inserted into the inner cavity of the collecting electrode. A self-cleaning layer is provided on the inner periphery of the collecting electrode and the outer periphery of the rod-shaped discharging electrode. The self-cleaning layer is a two-layer structure comprising a micro-nano etched layer and a superhydrophobic layer, wherein the micro-nano etched layer is the inner layer and the superhydrophobic layer is the outer layer. The rod-shaped discharge electrode is also provided with multiple discharge protrusions. The discharge protrusions are integral with the body of the rod-shaped discharge electrode and the joint between them is rounded. The self-cleaning layer is also provided on the discharge electrode sidewall of the adjacent discharge protrusions. The tip of the discharge protrusion is not provided with the super-dual hydrophobic layer.

2. The electrostatic adsorption component for oil fumes according to claim 1, characterized in that: Both ends of the collecting electrode are designed with rounded corners.

3. The electrostatic adsorption component for oil fumes according to claim 1, characterized in that: The rod-shaped discharge electrode has several rows of discharge protrusions equidistantly arranged in its longitudinal direction. Each row of discharge protrusions has three or more evenly distributed around the periphery of the rod-shaped discharge electrode, and both ends of the rod-shaped discharge electrode are set as hemispherical structures.

4. The electrostatic adsorption component for oil fumes according to claim 1, characterized in that: The micro-nano etched layer is formed by acid etching, alkaline etching, salt solution etching, photolithography, or ion beam etching, and the superbihydrophobic layer is formed by spraying or dipping organic materials, inorganic materials, or composite materials.

5. A method for preparing an electrostatic adsorption component for oil fumes, characterized in that: The method includes the following steps: Step 1: Use 320-600 grit coarse sandpaper to polish the surfaces of the collecting electrode and the discharging electrode of the electrostatic adsorption component for oil fumes to a smooth finish. Step 2: Perform surface etching on the collecting electrode and discharging electrode of the oil fume electrostatic adsorption component. Use a 0.1wt% solution of weak acid such as acetic acid or carbonic acid, a weak alkali such as ammonium monohydrate, or a salt such as nickel chloride or cobalt chloride for immersion chemical etching, or use photolithography or ion beam etching to etch the surface of the collecting electrode and discharging electrode, thereby forming a micro-nano etched layer on the surface of the collecting electrode and discharging electrode. Step 3: Prepare a superhydrophobic material suspension by mixing micron-sized polytetrafluoroethylene powder, octadecyltrichlorosilane and water in a molar ratio of 0.5:2:1, ultrasonically disperse for 10 minutes to ensure thorough mixing, let stand for 2 hours, and then add n-hexane for dispersion. Step 4: Seal the tip of the discharge protrusion on the discharge electrode with wax; Step 5: Use a spray gun to spray the suspension obtained in Step 3 onto the etched collecting electrode and discharging electrode surfaces, or directly immerse the etched collecting electrode and discharging electrode in the superhydrophobic material suspension obtained in Step 3 for 12 hours. Step 6: Allow the sprayed collecting electrode and discharging electrode to air dry, or remove the submerged collecting electrode and discharging electrode from the solution, rinse with n-hexane, and allow to air dry to form a superhydrophobic double layer.

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