Automatic cleaning device for extractor hood

Abstract

An automatic cleaning device for range hoods is disclosed. The range hood contains a graphite gill sieve made of graphite wire and a graphite wire mesh purification device. The automatic cleaning device consists of a programmable controller that controls the electrically heated graphite wires of the gill mesh, water mist nozzles, solenoid valves, temperature control switches, and the graphite wire mesh within the decorative panel. Utilizing the electrically heated graphite wire mesh, the programmable controller controls the heating of the graphite wires and water mist nozzles to perform water mist steam cleaning. Combined with the electrically heated graphite wires, this removes grease and stains, restoring the adsorption capacity and conductivity of the graphite wires. The device is reusable and does not produce secondary pollution.

Description

Technical Field

[0001] This invention relates to an automatic cleaning device for range hoods. The range hood is equipped with a graphite gill purification device surrounded by evenly distributed water mist nozzles. An intelligent programmable controller controls the graphite gill mesh to be electrically heated and then cleaned with electrically heated steam, achieving automatic cleaning of the range hood. The electrically heated graphite gill mesh removes contaminants from the graphite wires and restores the adsorption capacity and conductivity of the graphite wires. Background Technology

[0002] Currently, the market lacks range hoods with both fume purification and automatic cleaning functions suitable for home use. Most range hoods simply pass through a filter and are then exhausted outdoors. Furthermore, most household range hoods lack internal automatic cleaning capabilities, requiring professional cleaning after a period of use. Professional cleaning of range hoods is technically complex, often involving soaking and scrubbing with strong alkalis, which can burn skin and cause environmental pollution. As living standards improve, users have increasingly higher demands for indoor air quality, noise levels, daily maintenance, energy consumption, and maintenance costs. Due to the small size of household range hoods, simultaneously achieving fume purification and automatic cleaning presents significant technological challenges. Integrating fume purification and automatic cleaning would substantially increase costs, making the range hood market highly competitive. Therefore, innovative technology is key to market success. Summary of the Invention

[0003] To overcome the shortcomings of existing household range hoods' automatic cleaning function, the present invention aims to provide a graphite gill purification range hood that utilizes the high-voltage electrostatic field of a graphite gill purification device to purify pollutants. The graphite gill purification device is vertically installed on the top vent of the exhaust hood, with water mist nozzles evenly distributed around its perimeter. It uses electrically heated graphite wires and electrically heated steam to clean and remove pollutants from the graphite gill wire mesh and graphite gill wires, restoring the graphite wires' adsorption capacity and conductive discharge function.

[0004] Graphite fiber, as a high-performance carbon material, possesses the general properties of carbon fiber, including low density, high specific strength, high specific modulus, low coefficient of thermal expansion, thermal conductivity, electrical conductivity, high-temperature resistance, flame retardancy, corrosion resistance, fatigue resistance, wear resistance, ease of cleaning and maintenance, good flexibility, convenient winding, and ease of processing. Its unique three-dimensional ordered graphite layered structure gives it excellent mechanical, electrical, and adsorption properties, exhibiting hydrophobic and oleophilic characteristics. This allows it to effectively adsorb non-methane hydrocarbons and other oil fume particles, making it a promising candidate for oil fume purification. Graphite fiber purification devices can be boiled in water, soaked in detergent, or heated periodically to 290-300℃ using the conductive heating properties of graphite wires. This removes condensed oil and dirt from the graphite wire mesh, restoring its adsorption and conductive discharge capabilities.

[0005] A graphite gill purification device, made of graphite wire, is installed in a household range hood. Polluted airflow passes through a high-voltage electrostatic field between the cylindrical graphite gills and the graphite gill wire mesh. This field adsorbs oil fumes, dust, and VOCs from the polluted airflow. By controlling the electric field distance and ionization strength, ozone and plasma are generated, reacting with the pollutant particles to oxidize them and dissolve them, thus purifying the oil fumes. The graphite wires are then heated electrically, and steam cleaning is performed to remove contaminants from the graphite gill wire mesh and the wires themselves, restoring their adsorption and conductivity. A programmable controller controls the range hood, enabling intelligent cleaning. Maintenance is simple and convenient, with no secondary pollution. This protects the environment by reducing oil fume emissions, and prevents oil buildup on the range hood fan impeller, reducing cleaning costs.

[0006] The automatic cleaning device for the range hood consists of a programmable controller that controls the electrically heated graphite wires, water mist nozzles, and graphite wire mesh. The graphite gill purification device is vertically installed on the top vent of the range hood, with water mist nozzles and ultraviolet lamps evenly distributed around its perimeter. It utilizes electrically heated graphite wires and electrically heated steam to remove contaminants from the graphite gill mesh and graphite gill wires, restoring the adsorption capacity and conductive discharge function of the graphite wires.

[0007] Multiple identical decorative panels are installed inside the forward-leaning air vent of the fume hood. The frames of these decorative panels are the same size as the air vents of the fume hood and are tightly fitted inside the sloping air intake. Graphite mesh is installed within the frames, with the mesh lines interlacing to increase density and effectively trapping and adsorbing oil fumes and dust pollutants. The trapped pollutants condense on the mesh lines and flow along them into the oil collection box at the bottom of the fume hood.

[0008] The graphite gill purification range hood consists of a fume hood and a purification unit. The purification unit is located in the center of the top panel of the fume hood. Inside the purification unit, the top panel of the fume hood houses the air vents for the graphite gill purification device. Parallel graphite gill screens and graphite gill wire meshes are vertically fixed around the outer edge of the air vents. Multiple graphite gill wires of equal length are fixed at the intersections of the graphite gill screens. The fibers of the graphite gill wires extend equidistantly towards the graphite gill wire mesh and are connected to a high-voltage electrostatic power supply.

[0009] The range hood draws in cooking fumes under negative pressure through its intake vent. After passing through a graphite mesh filter on the vent's decorative panel, the fumes are then drawn into a high-voltage electrostatic field created by the graphite gill screen and mesh. The graphite gill fibers and mesh adsorb and intercept the cooking fumes, dust, and VOCs in the airflow. By controlling the electric field distance and intensity to exceed the ionization field strength of the gas, ozone and plasma are generated, reacting with pollutants to oxidize them and break them down, thus purifying the cooking fumes.

[0010] Graphite wires possess excellent electrical conductivity. By heating the graphite wires with electricity, the conductive heating effect is combined with electrically heated steam generated from sprayed water mist to clean the wires. This removes contaminants condensed on the graphite wires and the graphite gill screen, restoring their adsorption and electrical discharge capabilities. Furthermore, it does not cause secondary pollution and offers advantages such as simple structure, easy installation and maintenance, automatic cleaning of grease and grime, reduced maintenance costs for range hoods, and noise reduction.

[0011] The technical solution adopted by the automatic cleaning device for range hoods of the present invention is as follows: the automatic cleaning device for range hoods consists of a programmable controller that controls the heating of graphite wires in a graphite gill mesh, a water mist nozzle, a solenoid valve, a temperature control switch, and a graphite mesh inside a decorative panel.

[0012] The graphite gill purification range hood consists of a fume hood and a purification unit. The purification unit is located in the center of the top panel of the fume hood and is sealed with adhesive to prevent water mist and condensate leakage during cleaning. The graphite gill purification device, composed of a graphite gill screen and a graphite gill wire mesh, is positioned in the center of the purification unit within the top panel of the fume hood, with equal clearance from the four walls of the purification unit for airflow. A maintenance panel is located on the front panel of the purification unit, with its sides bent and secured to the unit with screws. Above the graphite gill purification device, a partition is installed, sealing it to the purification unit. The partition has a flared air vent, and the centrifugal fan inlet is installed on the axis of the flared air vent. The centrifugal fan casing outlet leads to the outdoor exhaust duct via a duct and a check valve. The lower front inclined panel of the fume hood has an air intake. Below the air intake is a guide rail and a pull-out oil collection box. The oil collection box can be inserted into the guide rail and pulled out for easy cleaning.

[0013] The exhaust hood features a forward-extending panel and a forward-sloping vent panel. The vent on the forward-sloping panel has borders on the left, right, top, and bottom. Multiple decorative panel frames are made in 2 to 3 evenly spaced pieces, facilitating disassembly and cleaning. The forward-sloping vent panel has multiple identical decorative panels, with frames matching the airflow vent area of ​​the exhaust hood. These panels are tightly fitted inside the vent of the sloping panel. The frames contain multiple layers of graphite mesh, with the mesh lines interlacing to increase density and effectively absorb and intercept pollutants. U-shaped guide channels are located on the four sides of the trapezoidal vent at the bottom of the exhaust hood and on the two sides of the vent on the sloping panel. These channels are of uniform depth, interconnected, and slightly sloped, connecting to the grease trap at the bottom of the range hood to intercept and temporarily store condensed wastewater and grease. The intercepted pollutants condense on the mesh lines and flow along them into the grease trap at the bottom of the range hood. A waist-shaped vent with a graphite gill purification device is located on the top panel of the fume hood. Below this waist-shaped vent, a trapezoidal vent connects to it. The trapezoidal vent has an opening of the same shape as the inner edge of the waist-shaped vent with the graphite gill device, extending into the inner edge of the waist-shaped vent and slightly higher than the top panel of the fume hood. A small guide gap is left between the waist-shaped vent on the trapezoidal vent and the inner edge of the waist-shaped vent on the top panel of the fume hood. The lower edge of the waist-shaped vent connects to four trapezoidal plates, with the lower edges of the four inclined plates inserted parallel to the center line of the U-shaped guide channel. The four inclined plates of the trapezoidal vent provide two-sided guidance, allowing cooking fumes and condensed oily / wastewater to flow along the plate surface into the U-shaped guide channel. The oily wastewater intercepted and condensed by the graphite gills and graphite gill mesh, as well as the wastewater generated from cleaning the graphite gills and graphite gill mesh, all flow onto the top plate of the fume hood. From there, it flows through the guide gaps onto the four inclined plates of the trapezoidal air vents and also into the U-shaped guide channel. Finally, through the U-shaped guide channel that connects to the four inclined plates of the trapezoidal air vents, it flows into the oil collection box at the bottom of the fume hood.

[0014] A control box is installed on the panel of the fume hood. Inside, there are power switches, electric heating steam cleaning switches, heating and decontamination switches, temperature control switches, speed control switches, lighting switches, fume alarms, motion sensors, temperature indicators, and fan speed displays. The control box also contains an intelligent programmable controller, a high-voltage electrostatic power supply, a power supply and power conduit, which leads to the centrifugal fan, graphite gills and graphite wire mesh and other components.

[0015] The graphite gill purification device consists of graphite gills and a graphite gill wire mesh. It is vertically installed in the center of the purification unit on the top plate of the fume hood, with equal spacing between it and the four walls of the purification unit for airflow. A waist-shaped air vent, the same size as the waist-shaped vent of the waist-shaped graphite gill purification device, is opened at the point where it overlaps with the top plate of the fume hood inside the purification unit. Parallel graphite gill screens and graphite gill wire mesh are vertically fixed around the waist-shaped vent. Multiple graphite gill wires of equal length are fixed at the intersection of the graphite gill screens. The spreading graphite gill wire fibers extend equidistantly towards the graphite gill wire mesh and are connected to the positive and negative electrodes of a high-voltage electrostatic discharge.

[0016] The graphite gill screen is a stainless steel mesh installed inside the graphite gill purification device, surrounding the edge of the waist-shaped air vent. The graphite gill screen is fixedly connected to the top plate of the waist-shaped screen and the bottom ring plate of the waist-shaped screen. At the intersections of the graphite gill screen's longitudinal and transverse sections, multiple graphite threads of equal length are wound and fixed as graphite gill threads, with their free ends spreading out to form graphite fibers. These multiple graphite gill threads are fixed to the stainless steel graphite gill screen, equidistant from the graphite gill wire mesh, maintaining an equal high-voltage electrostatic field distance. The top plate of the waist-shaped screen is a waist-shaped fixing plate similar to the waist-shaped air vent. The ring plate of the waist-shaped screen has an opening in the middle, identical to the waist-shaped air vent on the top plate of the fume hood, and its width is equal to the length of the graphite gill threads. The top plate and the ring plate are the same shape and size, with parallel outer edges. The graphite gill screen is vertically fixed between the top plate of the screen and the screen ring plate, and the screen ring plate is installed at the waist-shaped air outlet position of the top plate of the exhaust hood.

[0017] The graphite gill wire mesh surrounding the graphite gill screen is parallel and equidistant from the screen. The graphite gill wire mesh is equipped with symmetrical upper and lower wire hook supports for fixing the electrostatic wire mesh. These symmetrical wire hook supports are waist-shaped rings made of high-temperature resistant insulating material. Each wire hook support has a waist-shaped platform facing the upper electrostatic mesh plate and a protruding waist-shaped platform facing the lower electrostatic mesh ring plate at the center line of the waist-shaped ring. Screw holes are evenly distributed along the center line of the protrusions to fix them to the upper and lower electrostatic mesh plates. The inner and outer edges of the wire hook supports have evenly distributed long and short openings perpendicular to the center line of the protrusions. The width of each opening is greater than twice the diameter of the graphite wire. The long and short openings are staggered, and the difference in distance between the long and short openings extending towards the protrusions is equal to the spacing of the graphite wire. The long and short openings are offset by half the wire spacing, and the semi-circular section of the waist-shaped ring is offset by half the opening angle. A semi-circular groove with a diameter greater than twice the diameter of the graphite wire is provided at the base of the long and short openings to facilitate the winding and fixing of the graphite wire. The upper and lower waist-shaped ring wire hook supports have symmetrical openings of varying lengths. Graphite gill wire mesh is wound around each of the inner and outer openings, with two layers of parallel graphite wire mesh on both the inner and outer sides of the waist-shaped ring. The graphite wire mesh is offset from the adjacent layers by half a line distance. The semi-circular section of the waist-shaped ring is offset by half an opening angle. Each layer uses one graphite wire, wound sequentially from the inside out, around the opening of the wire hook support, with the graphite wires of the inner and outer layers parallel and insulated. The two ends of the graphite wires in each layer of graphite gill wire mesh are connected to a socket on the upper electrostatic mesh plate. The socket is connected to a high-voltage electrostatic power supply and a power source via an insulated power cord.

[0018] The upper electrostatic mesh plate and the lower electrostatic mesh ring plate are identical oblong plates. The lower electrostatic mesh ring plate has an oblong vent, while the upper electrostatic mesh plate is an oblong plate without a vent. Symmetrical mesh hook brackets are mounted on the upper and lower sides, with screw holes evenly distributed along the center line of the boss. ScrewIt is fixed between the upper electrostatic mesh plate and the lower electrostatic mesh ring plate. To ensure insulation, the mesh hook bracket, upper electrostatic mesh plate, and lower electrostatic mesh ring plate are made of high-temperature resistant insulating material. The graphite gill screen is fixedly connected to the upper electrostatic mesh plate and lower electrostatic mesh ring plate via insulating gaskets, insulating ceramic pillars, and insulating plates. It is ensured that the graphite gill wire mesh is parallel and insulated from the graphite gill screen, and that the top plate of the graphite gill purification device is insulated from the fume hood and the purification unit housing. The insulating plate is at the same height as the insulating ceramic pillars and is laid along the inner edge of the upper screen top plate and the lower screen ring plate without gaps, ensuring that the polluted airflow must pass through the graphite gill for purification.

[0019] The waist-shaped, barrel-shaped graphite gill wire mesh and graphite gill screen are equidistant and parallel, with power lines through insulated conduits connected to the positive and negative terminals of a high-voltage electrostatic power supply. Multiple graphite gill wires of equal length, fixed to the graphite gill screen, have their ends radiating outwards. Under the influence of the high-voltage electric field of the graphite gill screen and mesh, the repulsive force of like charges and the attractive force of unlike charges cause each bundle of multiple radiating graphite gill wire fibers to extend towards the graphite gill wire mesh. The high-voltage electrostatic field maintains an equal distance between the tips of each graphite gill fiber. Due to the point discharge effect of high-voltage electrostatics, the tips of the graphite gill fibers become a concentrated discharge area in the waist-shaped barrel. The small distance between the graphite gill fiber tips allows for oscillation, more effectively adsorbing particles of pollutants such as dust, VOCs, and oil fumes, or charging the particles so they are adsorbed by the electric field of the graphite gill wire fibers or the graphite gill wire mesh, thus purifying the airflow. When local airflow is disturbed, the graphite gill fibers oscillate with the flow. Due to the force generated by the electric field, the dynamic graphite gill fiber tips automatically maintain a uniform distribution in the flowing airflow. When dust, oil fumes, VOCs, or other pollutant particles, or particles with different charges, approach each other, the adsorption force pulls the graphite gill fiber tips closer together, improving the purification rate of airflow pollutants. The graphite gill fibers follow the direction of the airflow, and the airflow passes perpendicularly through the graphite gill mesh with a very small spacing, reducing electrostatic voltage, saving energy, increasing safety and reliability, and improving purification efficiency. By controlling the electric field distance and intensity, when it exceeds the ionization field strength of the gas, the gas is ionized, producing ozone and plasma that react with and decompose pollutant particles. After being purified by the graphite gill screen and graphite gill mesh of the graphite gill purification device, the airflow is discharged by a centrifugal fan, greatly improving the purification rate of airflow pollutants.

[0020] The graphite wire mesh utilizes the unique carbon-based active adsorption and hydrophobic-oleophilic properties of graphite fibers, effectively adsorbing VOCs, odors, and oil fume particles. The graphite wire mesh can effectively adsorb and intercept pollutants. However, after a period of use, the graphite wire mesh becomes covered in oil and grime, clogging the micropores of the graphite fibers, reducing the specific surface area, and causing the graphite wire mesh to gradually lose its adsorption capacity. The dirt on the surface of the graphite wire mesh also reduces its conductivity and the ability to discharge high-voltage electrostatic fields, further decreasing its ability to adsorb particulate matter. Regular cleaning of the graphite wire mesh is necessary to remove the dirt. The graphite wire mesh range hood is equipped with an automatic cleaning device. The automatic cleaning device consists of a programmable controller that controls the heating of the graphite wire mesh, water mist nozzles, solenoid valves, temperature control switches, and the graphite wire mesh within the decorative panel. The feature is that a normally closed temperature control switch is installed near the multi-layered, mutually insulated graphite wire mesh, the graphite wires of the graphite wire mesh are connected in series, the normally closed temperature control switch is connected to the power supply, and water mist nozzles are evenly distributed and facing the graphite wire mesh on the upper part of the outer periphery of the graphite wire mesh. The water mist nozzles are sealed to the water supply pipe via a solenoid valve.

[0021] For cleaning the multi-layered graphite mesh decorative panel, simply remove it and soak it in detergent solution for washing, or steam it to remove stains from the graphite mesh. The electric heating cleaning device offers two cleaning methods: electric cleaning and electrically heated steam cleaning.

[0022] Multiple identical decorative panels are installed at the vents of the forward-tilted panel of the exhaust hood. Each decorative panel frame contains multiple layers of graphite mesh, with the mesh lines interlacing to increase density and effectively adsorb and intercept pollutants. Two to three evenly spaced panels are made according to the vent size for easy disassembly and cleaning. The decorative panel frames are the same size as the airflow vents of the exhaust hood and are installed tightly against the inclined panel's air intake. As the polluted airflow passes through the densely packed graphite mesh, inertial collision and carbon-based active adsorption adsorb and intercept pollutant particles, which then flow along the mesh into the oil collection box at the bottom of the range hood. U-shaped guide channels are located on the four sides of the lower part of the trapezoidal vent of the exhaust hood. The openings of these U-shaped channels face upwards and connect with the U-shaped guide channels on the lower left and right inclined edges of the forward-tilted panel vents. The openings of the left and right U-shaped guide channels face inwards. These U-shaped guide channels are of uniform depth, interconnected, and slightly sloped, connecting to the oil collection box at the bottom of the range hood to intercept and temporarily store condensed wastewater and grease. Remove the decorative panel from the forward-tilting panel vent and soak and wash it in detergent. Alternatively, you can steam or boil it to remove stains from the graphite lines.

[0023] Inside the range hood's purification unit, water mist nozzles are evenly distributed around the upper periphery of the graphite gill purification device, facing the graphite gill mesh. These nozzles are connected to the water inlet valve via solenoid valves. The water mist nozzles are wide-angle, fine atomizing nozzles, fixed to the upper part of the purification unit. The water mist is sprayed downwards, flowing along the vertical graphite lines of the graphite gill mesh, increasing the heating time of the water mist. The electric heating steam cleaning switch can be manually activated, or the electric heating steam cleaning program can be started by a programmable controller, which controls automatic cleaning and the opening and closing of the water inlet solenoid valve. A temperature control switch is installed on the electrostatic mesh plate of the graphite gill purification device, near the graphite gill mesh, and is fixed to the upper electrostatic mesh plate. The temperature control switch is a normally closed 300-degree switch, connected to the electric heating steam cleaning switch and power supply on the control panel. Graphite wires have good conductivity; therefore, the graphite wires of the multi-layer graphite gill mesh need to be connected in series before being connected to the temperature control switch and power supply to increase the resistance of the series-connected graphite wires and prevent short circuits.

[0024] The cleaning and maintenance of the range hood's purification unit and graphite gill purification device are performed manually by activating the electric steam cleaning switch, or automatically by initiating the electric steam cleaning program via a programmable controller. Electric steam cleaning utilizes the thermal effect of the conductive graphite wires and the vaporization of water mist to remove oil and grease from the graphite wires. Before initiating electric steam cleaning, connect the water inlet valve (connected to the solenoid valve) to the tap water pipe, open the water inlet valve, and the solenoid valve will control the water supply. The programmable controller will then initiate the electric steam cleaning process, shut off the centrifugal fan and high-voltage electrostatic power supply, and ensure the duct check valve is closed. When the electric heating steam cleaning switch is turned on, the power supply powers the solenoid valve, which in turn powers the series-connected graphite gill mesh via the temperature control switch and the graphite gill mesh socket. The graphite wires of the multi-layer graphite gill mesh are connected in series with the power source. The conductive heating effect heats the graphite wires to 290-300℃, opening the solenoid valve. The programmable controller then controls the water supply solenoid valve to pulse-spray fine water mist onto the multi-layer graphite gill mesh. The water mist vaporizes upon contact with the heated graphite wires, producing steam. The steam and hot water melt and dissolve any adhering oil or dirt on the graphite wires. The duct check valve remains closed, preventing steam from entering the outdoor exhaust duct. When the temperature drops, the temperature control switch reconnects the power, continuing to heat the graphite wires of the multi-layer graphite gill mesh, and the water mist nozzles continue to pulse-spray fine water mist. The heat effect, steam and hot water remove the oil and stains on the graphite line. The wastewater drips onto the top plate of the fume hood, flows through the guide gap to the four inclined plates of the trapezoidal air outlet, and the lower part of the four inclined plates of the trapezoidal air outlet is inserted into the center line of the U-shaped guide groove. The wastewater then flows through the guide groove to the oil collection box.

[0025] Electric steam cleaning removes oil and dirt from the surface of graphite wires. Only when the graphite wires are heated to 290-300℃, oxidizing the dirt clogging the micropores of the graphite fibers, can the graphite wires' adsorption capacity and conductive discharge performance be fully restored. A programmable controller keeps the timer running. When the predetermined time for electric steam cleaning is reached, the water mist spray stops. The programmable controller then controls the continued supply of power for heating. When the temperature of the multi-layer graphite gill mesh reaches 300℃, the temperature control switch activates, disconnecting the power supply and stopping power. When the temperature drops, the temperature control switch activates again, continuing power heating. The programmable controller keeps the timer running, controlling the power supply for heating until the temperature reaches 300℃ and the predetermined time is reached, ensuring the effectiveness of high-temperature heating, and then stops power. This completes the cleaning of the graphite wires and also dries the graphite wires and internal components of the casing. The conductive heating effect heats the graphite wires and also bakes the graphite gill mesh, removing oil and dirt and restoring the graphite wires' adsorption capacity and conductive discharge performance. It can be reused repeatedly without causing secondary pollution.

[0026] The graphite gill purification range hood is equipped with an intelligent programmable controller, whose control program can be programmed as needed. The automatic cleaning device can be manually controlled or activated by the intelligent programmable controller. Primarily, it should be intelligently controlled by a pre-programmed sequence, providing reminders of the cleaning cycle and time, the duration of automatic cleaning, and the cleaning process. This achieves automatic cleaning of the range hood, reducing grease buildup on the fan and exhaust pipes, and eliminating the time-consuming and labor-intensive process of professional cleaning.

[0027] Graphite wires possess advantages such as good conductivity, high-temperature resistance, flame retardancy, corrosion resistance, fatigue resistance, wear resistance, and ease of cleaning and maintenance. The decorative panel and graphite gill purification device can be removed and soaked in detergent or boiled for cleaning to remove stains. Cleaning and maintenance of the graphite gill purification device and its housing restores the adsorption activity and electrical conductivity of the device. The automatic cleaning device for graphite gill purification range hoods can also be used, based on the internal structure of other fume purifiers, by setting multiple layers of graphite wire mesh at the airflow cross-section to act as a fume purifier, connected to a high-voltage electrostatic interceptor to purify the fumes. A normally closed temperature control switch is installed near the multiple layers of graphite wire mesh, and the multiple layers are connected in series for electrically heated steam cleaning.

[0028] Compared with existing technologies, the present invention has the following advantages: The graphite gill purification range hood is equipped with an automatic cleaning device, making full use of the graphite gill purification setting. It combines the functions of oil fume purification and electric heating purification and cleaning, with one structure performing two functions, solving the two problems of oil fume purification and purification and cleaning in existing household range hoods.

[0029] The automatic cleaning device for range hoods utilizes the electrically heated graphite wire mesh. Combined with the graphite gill purification structure of the range hood, an automatic cleaning system is implemented. A programmable controller regulates the heating of the graphite wire mesh and water mist nozzles, spraying water mist and steam for cleaning. This, combined with the electrically heated graphite wire mesh being baked, removes grease and stains, restoring the graphite wire mesh's adsorption capacity and conductivity. It is reusable and will not produce secondary pollution.

[0030] Graphite gill lines, graphite gill mesh, and graphite mesh for decorative panels are all made using graphite lines. Compared with metal materials, they are lightweight, have high tensile strength, are oil-resistant, water-resistant, corrosion-resistant, high-temperature resistant, easy to process, hydrophobic and oleophilic, easy to clean and maintain, and are also convenient to process and manufacture, safe and reliable, eliminating the dangers of metal welding and desoldering.

[0031] Inside the range hood's purification unit, the automatic cleaning device is equipped with water mist nozzles, solenoid valves, and a temperature control switch. Its simple structure facilitates intelligent control. A programmable controller manages the automatic cleaning device, reminding users of the cleaning cycle and time, automatically controlling the cleaning duration and process. This achieves automatic cleaning of the range hood, eliminating the time-consuming and labor-intensive process of traditional cleaning and the hassle of hiring professionals.

[0032] The water supply pipe, U-shaped guide channel, trapezoidal air outlet of the exhaust hood, and automatic cleaning device work together to form a simple and reliable structure. Electricity and water are easy to use in the kitchen environment. No disassembly is required for cleaning, and automatic cleaning is implemented.

[0033] The automatic cleaning device of the graphite gill purifier range hood operates on the same principle and structure as other fume purifiers, using heated steam for cleaning. It can also be used in commercial kitchen fume purification, industrial dust removal, and other specialized fields, demonstrating broad applicability. Attached Figure Description

[0034] Figure 1 This is a side cross-sectional view of an embodiment of the automatic cleaning device for range hoods of the present invention.

[0035] Figure 2 yes Figure 1 A top-view cross-sectional diagram of the automatic cleaning device for a range hood.

[0036] Figure 3 yes Figure 1 Enlarged cross-sectional schematic diagram of barrel-shaped graphite gill screen and graphite gill wire mesh.

[0037] Figure 4 yes Figure 1 A magnified schematic diagram of a partial side view section.

[0038] Figure 5 yes Figure 2 A magnified schematic diagram of a partial cross-section.

[0040] In the diagram, Z1 is the exhaust hood, Z2 is the control box, Z3 is the panel, Z4 is the purification unit chassis, Z5 is the oil collection box, Z6 is the exhaust hood top plate, Z7 is the waist-shaped air vent, Z8 is the air guide gap, Z9 is the trapezoidal air vent, Z10 is the air guide groove, Z11 is the power switch, Z12 is the power cord, Z13 is the intelligent programmable controller, Z14 is the decorative panel, Z15 is the high-voltage electrostatic power supply, Z16 is the temperature control switch, Z17 is the air vent frame, Z18 is the lighting lamp, Z19 is the nozzle, Z20 is the solenoid valve, Z21 is the water inlet pipe, Z22 is the water inlet valve, Z23 is the chassis inspection plate, and Z24 is the screw. F1. Motor; F2. Centrifugal fan; F3. Trumpet-shaped air outlet; F4. Baffle plate; F5. Centrifugal fan casing; F6. Exhaust pipe; F7. Check valve. L1. Barrel-shaped graphite gill, L2. Graphite gill line, L3. Screen top plate, L4. Screen ring plate, L5. Graphite gill screen, L6. Graphite gill line mesh, L7. Upper electrostatic mesh plate, L8. Lower electrostatic mesh ring plate, L9. Mesh hook bracket, L10. Insulating plate, L11. Graphite mesh, L12. Socket, L13. Screw, L14. Insulating ceramic post, L15. Insulating gasket, L16. Short opening, L17. Long opening. Detailed Implementation

[0041] The invention will be further illustrated by the examples shown in the accompanying drawings. Figure 1 This is a side cross-sectional view of an embodiment of the automatic cleaning device for range hoods of the present invention. Figure 2 This is a front view cross-sectional schematic diagram of the automatic cleaning device for range hoods of the present invention.

[0042] The technical solution adopted in the implementation example of the automatic cleaning device for range hoods of the present invention is as follows: the automatic cleaning device for range hoods consists of a programmable controller Z13 that controls the heating of the graphite wires of the graphite gill mesh L6, a water mist nozzle Z19, a solenoid valve Z20, a temperature control switch Z16, and a graphite mesh L11 inside the decorative panel Z14.

[0043] The graphite gill purification range hood consists of a fume hood Z1 and a purification unit Z4. The purification unit is located in the middle of the top plate Z6 of the fume hood and is sealed and fixed to the top plate to prevent water mist and condensate leakage during cleaning. The front panel of the purification unit has a maintenance panel Z23, which is bent on both sides and tightened onto the purification unit with screws Z24. The graphite gill purification device consists of a graphite gill screen L5 and a graphite gill wire mesh L6, located in the center of the purification unit within the top plate of the fume hood, with equal spacing between it and the four walls of the purification unit for airflow. A partition F4 is installed above the graphite gill purification device within the purification unit, sealing it in place. The partition has a flared air vent F3, and the centrifugal fan inlet is installed on the axis of the flared air vent. The centrifugal fan casing F5 outlet leads to the outdoor exhaust duct via duct F6 and check valve F7. The lower front inclined panel of the fume hood has an air intake. Below the air intake is a guide rail and a pull-out oil collection box Z5. The oil collection box can be inserted into the guide rail and pulled out for easy cleaning.

[0044] The exhaust hood features a forward-extending panel Z3 and a forward-sloping panel. The left, right, top, and bottom edges of the air intake on the forward-sloping panel are bordered by Z17. Multiple decorative panels Z14 are framed in 2 to 3 evenly spaced pieces according to the size of the air intake, facilitating disassembly and cleaning. The forward-sloping panel air intake has multiple identical decorative panels, with frames of the same size as the exhaust hood's airflow openings. These panels are tightly fitted inside the inclined panel air intake. The frames contain multiple layers of graphite mesh L11, with the mesh lines interlacing to increase density and effectively absorb and intercept pollutants. U-shaped guide channels Z10 are located on the four sides of the trapezoidal air intake of the exhaust hood and on the two edges of the inclined panel air intake. These U-shaped guide channels are of uniform depth, interconnected, and slightly sloped, connecting to the oil collection box at the bottom of the range hood to intercept and temporarily store condensed wastewater and grease. The intercepted pollutants condense on the mesh lines and flow along them into the oil collection box at the bottom of the range hood. A waist-shaped vent for the graphite gill purification device L1 is located on the top plate of the fume hood. A trapezoidal vent Z9, connecting to the waist-shaped vent, is positioned below it. This trapezoidal vent has an opening of the same shape as the inner edge of the graphite gill waist-shaped vent, extending into the inner edge of the waist-shaped vent and slightly higher than the top plate of the fume hood. A small guide gap is left between the upper waist-shaped vent and the inner edge of the waist-shaped vent on the top plate of the fume hood. The lower edge of the trapezoidal waist-shaped vent connects to four trapezoidal plates, with the lower edges of the four inclined plates inserted parallel to the center line of the U-shaped guide groove. A small guide gap Z8 is left between the trapezoidal waist-shaped vent and the inner edge of the graphite gill waist-shaped vent. The lower edges of the four inclined plates of the trapezoidal vent are inserted parallel to the center line of the U-shaped guide groove. The four inclined plates of the trapezoidal vent have a two-sided guide function; the cooking fumes condensing on the four inclined plates flow along the plate surface into the U-shaped guide groove. The oily wastewater intercepted and condensed by the graphite gill screen and graphite gill wire mesh, as well as the wastewater generated from cleaning the graphite gill screen and graphite gill wire mesh, all flow onto the top plate of the fume hood. From there, it flows through the guide gaps onto the four inclined plates of the trapezoidal air vents, and also into the U-shaped guide channel. Finally, through the U-shaped guide channel that connects to the four inclined plates of the trapezoidal air vents, it flows into the oil collection box at the bottom of the fume hood.

[0045] A control box Z2 is installed on the exhaust hood panel Z3. Inside the control box are a power switch Z11, an electric heating steam cleaning switch, a heating and decontamination switch, a temperature control switch, a speed control switch, a lighting switch Z18, a smoke alarm, a motion sensor switch, a temperature indicator, a fan speed display, etc. The control box also contains an intelligent programmable controller Z13, a high-voltage electrostatic power supply Z15, a power supply and power conduit, which leads to the centrifugal fan F2, the graphite gill screen and graphite wire mesh and other components.

[0046] The graphite gill purification device L1 consists of a graphite gill screen L5 and a graphite gill wire mesh L6, which is vertically installed in the center of the purification unit on the top plate of the fume hood, with equal spacing between it and the four walls of the purification unit for airflow. A waist-shaped vent Z7, the same size as the waist-shaped vent of the waist-shaped graphite gill purification device, is opened at the position where it overlaps with the top plate of the fume hood inside the purification unit. Parallel graphite gill screens and graphite gill wire meshes are vertically fixed around the waist-shaped vent. Multiple graphite gill wires L2 of equal length are fixed at the intersection of the graphite gill screens, with the fibers of the spreading graphite gill wires extending equidistantly towards the graphite gill wire mesh and connected to the positive and negative electrodes of a high-voltage electrostatic discharge.

[0047] The graphite gill screen is a stainless steel mesh installed inside the graphite gill purification device, surrounding the edge of the waist-shaped air vent. The graphite gill screen is fixedly connected to the top plate L3 of the waist-shaped screen and the bottom ring plate L4 of the waist-shaped screen. At the intersections of the graphite gill screen's longitudinal and transverse sections, multiple graphite wires of equal length are wound and fixed as graphite gill wires, with their free ends spreading out to form graphite fibers. These multiple graphite gill wires of equal length are fixed to the stainless steel graphite gill screen, equidistant from the graphite gill wire mesh, maintaining an equal high-voltage electrostatic field distance. The top plate of the waist-shaped screen is a waist-shaped fixing plate similar to the waist-shaped air vent, and the ring plate has an opening in the middle, identical to the waist-shaped air vent on the top plate of the fume hood. The width of the ring plate is equal to the length of the graphite gill wires. The top plate and the ring plate of the screen are the same in shape and size, with parallel outer edges. The graphite gill screen is vertically fixed between the top plate and the ring plate. The ring plate is installed at the waist-shaped air vent position on the top plate of the exhaust hood.

[0048] The graphite gill wire mesh surrounding the graphite gill screen is parallel and equidistant from the screen. The graphite gill wire mesh is equipped with symmetrical upper and lower wire hook supports L9 for fixing the electrostatic wire mesh. These symmetrical wire hook supports are waist-shaped rings made of high-temperature resistant insulating material. Each wire hook support has a waist-shaped platform facing the upper electrostatic mesh plate L7 and a protruding waist-shaped platform facing the lower electrostatic mesh ring plate L8, with evenly distributed screw L13 holes along the center line of the protrusions. The screws L13 are used to fix the upper and lower electrostatic mesh plates. The inner and outer edges of the wire hook supports have evenly distributed long and short openings perpendicular to the center line of the protrusions. The width of each opening is greater than twice the diameter of the graphite wire. The long opening L17 and the short opening L16 are staggered, and the difference in distance between the long and short openings extending towards the protrusions is equal to the wire spacing of the wound graphite wire. The long and short openings are staggered by half the wire spacing, and the semi-circular section of the waist-shaped ring is staggered by half the opening angle. A semi-circular groove with a diameter greater than twice the diameter of the graphite wire is provided at the base of the long and short openings to facilitate the winding and fixing of the graphite wire. The long and short openings of the upper and lower waist-shaped ring mesh hook brackets are symmetrical. Graphite gill mesh is wound around the inner and outer openings in sequence. There are two layers of parallel graphite wire mesh on the inner and outer sides of the waist-shaped ring of the graphite gill screen, staggered by half the wire spacing from the graphite wires of the adjacent layers. The semi-circular section of the waist-shaped ring is staggered by half the opening angle. Each layer uses one graphite wire, first from the inside out, to wind parallel graphite gill mesh around the opening of the mesh hook bracket. The graphite wires of the inner and outer layers of graphite gill mesh are parallel and insulated. The two ends of the graphite wires of each layer of graphite gill mesh are connected to the socket L12 of the upper electrostatic mesh plate. The socket is connected to the high-voltage electrostatic power supply and the power supply via the insulated power line Z12.

[0049] The upper electrostatic mesh plate and the lower electrostatic mesh ring plate are identical waist-shaped plates. The lower electrostatic mesh ring plate has a waist-shaped air vent, while the upper electrostatic mesh plate is a waist-shaped plate without an air vent. Symmetrical mesh hook brackets are mounted on top and bottom, with evenly distributed screw holes along the center line of the boss. Screw It is fixed between the upper electrostatic mesh plate and the lower electrostatic mesh ring plate. To ensure insulation, the mesh hook bracket, upper electrostatic mesh plate, and lower electrostatic mesh ring plate are made of high-temperature resistant insulating material. The graphite gill screen is fixedly connected to the upper electrostatic mesh plate and lower electrostatic mesh ring plate via insulating gasket L15, insulating ceramic column L14, and insulating plate L10. This ensures that the graphite gill wire mesh is parallel and insulated from the graphite gill screen, and that the top plate of the graphite gill purification device is insulated from the fume hood and purification unit. The insulating plate is at the same height as the insulating ceramic column and is laid along the inner edge of the upper screen top plate and lower screen ring plate without gaps, ensuring that the polluted airflow must pass through the graphite gill purification device for purification.

[0050] The waist-shaped, barrel-shaped graphite gill wire mesh and graphite gill screen are equidistant and parallel, with power lines through insulated conduits connected to the positive and negative terminals of a high-voltage electrostatic power supply. Multiple graphite gill wires of equal length, fixed to the graphite gill screen, have their ends radiating outwards. Under the influence of the high-voltage electric field of the graphite gill screen and mesh, the repulsive force of like charges and the attractive force of unlike charges cause each bundle of multiple radiating graphite gill wire fibers to extend towards the graphite gill wire mesh. The high-voltage electrostatic field maintains an equal distance between the tips of each graphite gill fiber. Due to the point discharge effect of the high-voltage electrostatic field, the tips of the graphite gill fibers become a concentrated discharge area in the waist-shaped barrel. The small distance between the graphite gill fiber tips allows for oscillation, more effectively adsorbing particles of pollutants such as dust, fumes, and VOCs, or charging the particles so they are adsorbed by the electric field of the graphite gill wire fibers or the graphite gill wire mesh, thus purifying the airflow. When local airflow is disturbed, the graphite gill fibers oscillate with the flow. Due to the force generated by the electric field, the dynamic graphite gill fiber tips automatically maintain a uniform distribution in the flowing airflow. When dust, oil fumes, VOCs, or other pollutant particles, or particles with different charges, approach each other, the adsorption force pulls the graphite gill fiber tips closer together, improving the purification rate of airflow pollutants. The graphite gill fibers follow the direction of the airflow, and the airflow passes perpendicularly through the graphite gill mesh with a very small spacing, reducing electrostatic voltage, saving energy, increasing safety and reliability, and improving purification efficiency. By controlling the electric field distance and intensity, when it exceeds the ionization field strength of the gas, the gas is ionized, producing ozone and plasma that react with and decompose pollutant particles. After being purified by the graphite gill screen and graphite gill mesh of the graphite gill purification device, the airflow is discharged by a centrifugal fan, greatly improving the purification rate of airflow pollutants.

[0051] The graphite wire mesh utilizes the unique carbon-based active adsorption and hydrophobic-oleophilic properties of graphite fibers, effectively adsorbing VOCs, odors, and oil fume particles. The graphite wire mesh can effectively intercept, adsorb, and purify pollutants. However, after a period of use, the graphite wire mesh becomes covered in oil and grime, clogging the micropores of the graphite fibers, reducing the specific surface area, and causing the graphite wire mesh to gradually lose its adsorption capacity. The dirt on the surface of the graphite wire mesh also reduces its conductivity, the ability to discharge high-voltage electrostatic fields, and its ability to adsorb particulate matter. Regular cleaning of the graphite wire mesh is necessary to remove the dirt. The graphite wire mesh range hood is equipped with an automatic cleaning device. The automatic cleaning device consists of a programmable controller controlling the electrically heated graphite wire mesh, water mist nozzles, a solenoid valve Z20, a temperature control switch Z16, and the graphite wire mesh within the decorative panel. The feature is that a normally closed temperature control switch is installed near the multi-layered, mutually insulated graphite wire mesh, the graphite wires of the graphite wire mesh are connected in series, the normally closed temperature control switch is connected to the power supply, and water mist nozzles are evenly distributed and facing the graphite wire mesh on the upper part of the outer periphery of the graphite wire mesh. The water mist nozzles are sealed to the water supply pipe via a solenoid valve.

[0052] For cleaning the multi-layered graphite mesh decorative panel frame, simply remove it and soak it in detergent solution for washing, or steam it to remove stains from the graphite mesh. The electric heating cleaning device offers two cleaning methods: electric cleaning and electrically heated steam cleaning.

[0053] Multiple identical decorative panels are installed inside the forward-tilted panel vent of the fume hood. Each decorative panel frame contains multiple layers of graphite mesh, with the mesh lines interlacing to increase density and effectively adsorb and intercept pollutants. Two to three evenly spaced panels are made according to the vent size for easy disassembly and cleaning. The decorative panel frames are the same size as the airflow vents of the fume hood and are installed tightly against the inclined panel vent. As the polluted airflow passes through the densely packed graphite mesh, inertial collision and carbon-based active adsorption adsorb and intercept pollutant particles, which then flow along the mesh into the oil collection box at the bottom of the range hood. U-shaped guide channels are located on the four sides of the lower trapezoidal vent of the fume hood. The openings of these U-shaped channels face upwards and connect with the U-shaped guide channels on the lower left and right inclined edges of the forward-tilted panel vent. The openings of the left and right U-shaped guide channels face inwards. These U-shaped guide channels are of uniform depth, interconnected, and slightly sloped, connecting to the oil collection box at the bottom of the range hood to intercept and temporarily store condensed wastewater and grease. Remove the decorative panel from the forward-tilting panel vent and soak and wash it in detergent. Alternatively, you can steam or boil it to remove stains from the graphite lines.

[0054] Inside the range hood's purification unit, water mist nozzles are evenly distributed around the upper periphery of the graphite gill purification device, facing the graphite gill mesh. These nozzles are connected to the water inlet pipe Z21 and water inlet valve Z22 via solenoid valves. The water mist nozzles are wide-angle, fine atomizing nozzles, fixed to the upper part of the purification unit. The water mist is sprayed from top to bottom, flowing along the vertical graphite lines of the graphite gill mesh, increasing the heating time of the water mist. The electric heating steam cleaning switch can be manually activated, or the electric heating steam cleaning program can be started by the programmable controller, which controls the automatic cleaning process and the opening and closing of the water inlet solenoid valve. A temperature control switch is installed on the electrostatic mesh plate of the graphite gill purification device, near the graphite gill mesh, and is fixed to the upper electrostatic mesh plate. The temperature control switch is a normally closed 300-degree switch, connected to the electric heating steam cleaning switch and power supply on the control panel. Graphite wires have good conductivity; therefore, the graphite wires of the multi-layer graphite gill mesh need to be connected in series before being connected to the temperature control switch and power supply to increase the resistance of the series-connected graphite wires and prevent short circuits.

[0055] The cleaning and maintenance of the range hood's purification unit and graphite gill purification device are performed manually by activating the electric steam cleaning switch, or automatically by initiating the electric steam cleaning program via a programmable controller. Electric steam cleaning utilizes the thermal effect of the conductive graphite wires and the vaporization of water mist to remove oil and grease from the graphite wires. Before initiating electric steam cleaning, connect the water inlet valve (connected to the solenoid valve) to the water supply pipe, open the water inlet valve, and the solenoid valve will control the water mist nozzles on the water inlet pipe. The programmable controller will then initiate the electric steam cleaning process, shut off the centrifugal fan and high-voltage electrostatic power supply, and ensure the duct check valve is closed. When the electric heating steam cleaning switch is turned on, the power supply powers the solenoid valve, which in turn powers the series-connected graphite gill mesh via the temperature control switch and the graphite gill mesh socket. The graphite wires of the multi-layer graphite gill mesh are connected in series with the power source. The conductive heating effect heats the graphite wires to 290-300℃, opening the solenoid valve. The programmable controller then controls the water supply solenoid valve to pulse-spray fine water mist onto the multi-layer graphite gill mesh. The water mist vaporizes upon contact with the heated graphite wires, producing steam. The steam and hot water melt and dissolve any adhering oil or dirt on the graphite wires. The duct check valve remains closed, preventing steam from entering the outdoor exhaust duct. When the temperature drops, the temperature control switch reconnects the power, continuing to heat the graphite wires of the multi-layer graphite gill mesh, and the water mist nozzles continue to pulse-spray fine water mist. The heat effect, steam and hot water remove the oil and stains on the graphite line. The wastewater drips onto the top plate of the fume hood, flows through the guide gap to the four inclined plates of the trapezoidal air outlet, and the lower part of the four inclined plates of the trapezoidal air outlet is inserted into the center line of the U-shaped guide groove. The wastewater then flows through the guide groove to the oil collection box.

[0056] Electric steam cleaning removes oil and dirt from the surface of graphite wires. Only when the graphite wires are heated to 290-300℃, oxidizing the dirt clogging the micropores of the graphite fibers, can the graphite wires' adsorption capacity and conductive discharge performance be fully restored. A programmable controller keeps the timer running. When the predetermined time for electric steam cleaning is reached, the water mist spray stops. The programmable controller then controls the continued supply of power for heating. When the temperature of the multi-layer graphite gill mesh reaches 300℃, the temperature control switch activates, disconnecting the power supply and stopping power. When the temperature drops, the temperature control switch activates again, continuing power heating. The programmable controller keeps the timer running, controlling the power supply for heating until the temperature reaches 300℃ and the predetermined time is reached, ensuring the effectiveness of high-temperature heating, and then stops power. This completes the cleaning of the graphite wires and also dries the graphite wires and internal components of the casing. The conductive heating effect heats the graphite wires and also bakes the graphite gill mesh, removing oil and dirt and restoring the graphite wires' adsorption capacity and conductive discharge performance. It can be reused repeatedly without causing secondary pollution.

[0057] The graphite gill purification range hood is equipped with an intelligent programmable controller, whose control program can be programmed as needed. The automatic cleaning device can be manually controlled or activated by the intelligent programmable controller. Primarily, it should be intelligently controlled by a pre-programmed sequence, providing reminders of the cleaning cycle and time, the duration of automatic cleaning, and the cleaning process. This achieves automatic cleaning of the range hood, reducing grease buildup on the fan and exhaust pipes, and eliminating the time-consuming and labor-intensive process of professional cleaning.

[0058] Graphite wire boasts advantages such as excellent conductivity, high-temperature resistance, flame retardancy, corrosion resistance, fatigue resistance, wear resistance, and ease of cleaning and maintenance. The decorative panel and graphite gill purification device can be removed and soaked in detergent for washing, or steamed for cleaning to remove stains. Cleaning and maintenance of the graphite gill purification device and its housing restores the device's adsorption activity and electrical conductivity. The automatic cleaning mechanism of the graphite gill purification range hood utilizes a structure similar to other fume purifiers, employing heated steam cleaning. It can also be used in commercial kitchen exhaust hoods for fume purification, industrial dust removal, and other specialized fields, demonstrating broad applicability.

Claims

1. An automatic cleaning device for a range hood, comprising a programmable controller controlling a series connection of multiple layers of mutually insulated graphite wire mesh, a water mist nozzle, a solenoid valve, a temperature control switch, and a power supply, characterized in that: A normally closed temperature control switch is installed near the multi-layered, mutually insulated graphite wire mesh. The graphite wires of the graphite wire mesh are connected in series. The normally closed temperature control switch is connected to the power supply. Water mist nozzles are evenly distributed and face the graphite wire mesh on the upper part of the outer periphery. The water mist nozzles are sealed to the water supply pipe via a solenoid valve.

2. The automatic cleaning device for a range hood according to claim 1, characterized in that: Water mist nozzles are evenly distributed around the graphite gill purification device, facing the graphite gill mesh, and connected to the water supply valve via a solenoid valve.

3. The automatic cleaning device for a range hood according to claim 1, characterized in that: A normally closed temperature control switch is installed on the waist-shaped mesh top plate of the graphite gill purification device near the multi-layer graphite wire mesh that is mutually insulated. The multi-layer graphite wire mesh is connected in series and then connected in series with the normally closed temperature control switch and the power supply.

4. The automatic cleaning device for a range hood according to claim 1, characterized in that: The trapezoidal air vent of the range hood extends into the top panel vent, slightly higher than the top panel, leaving a small guide gap with the inner edge of the top panel vent. The four sides of the lower sloping plate of the trapezoidal air vent are inserted into the guide groove, and the guide grooves on both sides of the front inclined panel air intake vent connect to the oil collection box at the bottom of the exhaust hood.

5. The automatic cleaning device for a range hood according to claim 1, characterized in that: Multiple decorative panels are tightly installed inside the front inclined panel vent of the fume hood. Graphite wire mesh is installed within the frame of the multiple decorative panels, and the graphite wire mesh is interwoven back and forth.

6. The automatic cleaning device for a range hood according to claim 1, characterized in that: At both ends of the multi-layer graphite wire mesh, it is fixed to the air vents on the top plate of the smoke exhaust hood via insulating ceramic pillars and insulating plates.

7. The automatic cleaning device for a range hood according to claim 1, characterized in that: Install the partition and fix it to the purification box. Concentrically fix the centrifugal fan on the horn-shaped air outlet of the partition.

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