Range hood

Abstract

The application provides a range hood, comprising a shell, a volute assembly and an oil screen are arranged in the shell, the volute assembly is connected with an oil fume collecting device, the oil screen and the oil fume collecting device can generate an electric field with adsorption function, oil fume is ionized and charged when passing through the oil screen, and the oil fume collecting device adsorbs the charged oil fume particles, so that the collection of the oil fume particles is realized. The range hood provided by the application is connected with a positive electrode and the oil screen, a positive tungsten wire is arranged in the oil screen, the positive tungsten wire releases static electricity, so that the oil fume particles or dust carry positive charges, a negative electrode plate is fixed on a fixed ring through a screw, a positive and negative electric field is formed, the adsorption effect of the charged grease on the negative electrode plate is improved, and the grease deposition on the oil screen is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of kitchen equipment, and particularly relates to a range hood. Background Technology

[0002] Cooking fumes not only affect the cooking experience but also seriously impact the health of the cook. Furthermore, the difficulty in cleaning fumes that adhere to the cooking area affects the living experience, making it a long-standing problem affecting people's quality of life. To effectively remove cooking fumes, range hoods have become an essential kitchen appliance. Range hoods can absorb and remove cooking fumes during cooking, significantly improving the cooking experience and the user's quality of life.

[0003] In daily use, the worm gear of a range hood generates negative pressure by rotating, drawing kitchen fumes into the worm housing and expelling them into the atmosphere. Although the grease is separated from the fumes by the centrifugal force of the worm gear, as the usage time increases, more and more oil deposits accumulate on the worm gear blades, increasing the load on the worm gear and thus reducing the rotational speed and smoke extraction efficiency.

[0004] Cleaning the grease and fumes from a range hood often requires disassembling the entire hood. However, this can be very difficult for users unfamiliar with the structure and disassembly process of range hoods. Hiring professionals to clean it requires time and money, which affects the user experience and lifespan of the range hood, causing inconvenience to people's lives. Summary of the Invention

[0005] The main objective of this invention is to provide a range hood that solves the problem of grease buildup inside existing range hoods.

[0006] To achieve the above objectives, the specific technical solution of the range hood of the present invention is as follows:

[0007] This invention provides a range hood, including a housing, inside which a volute assembly and an oil filter are disposed. The volute assembly is connected to an oil fume collection device. The oil filter and the oil fume collection device can generate an electric field with adsorption function. When the oil fume passes through the oil filter, it is ionized and charged. The oil fume collection device adsorbs the charged oil fume particles, thereby realizing the collection of oil fume particles.

[0008] As a preferred embodiment of the present invention, a positive electrode component is provided on the oil screen to give the oil fume particles a positive charge; a negative electrode component is provided on the oil fume collection device to allow the oil fume particles to be adsorbed onto the oil fume collection device.

[0009] As a preferred embodiment of the present invention, the fume collection device includes a buffer structure, and the buffer structure and the negative electrode component are coaxially arranged so that the charged fume particles are adsorbed on the negative electrode component.

[0010] As a preferred embodiment of the present invention, a positive electric field is provided on the buffer structure to slow down the movement of positively charged oil fume particles when they approach the buffer structure, thereby achieving the adsorption of positively charged oil fume particles onto the negative electrode component.

[0011] In a preferred embodiment of the present invention, the buffer structure and the negative electrode assembly are fixedly connected, and the buffer structure is disposed between the negative electrode assembly and the volute assembly.

[0012] As a preferred embodiment of the present invention, the buffer structure includes a positioning ring, and a blocking member is provided at the center of the positioning ring. The blocking member is positively charged so that the positively charged oil fume particles and the positively charged blocking member repel each other, thereby reducing the running speed of the oil fume particles.

[0013] As a preferred embodiment of the present invention, a connecting rod is provided on the outer wall of the blocking member, and the connecting rod is fixedly connected to the side wall of the positioning ring so that the blocking member is fixed on the positioning ring.

[0014] As a preferred embodiment of the present invention, the volute assembly includes a front shell, the side wall of the front shell abutting against the connecting rod, and the front shell and the positioning ring are fixedly connected by fasteners so that the buffer structure is fixedly disposed between the front shell and the positioning ring.

[0015] As a preferred embodiment of the present invention, the blocking member is a conical structure, with the tip of the conical structure facing the negative electrode assembly, so that the oil fume particles move at a reduced speed along the surface of the conical structure.

[0016] As a preferred embodiment of the present invention, the negative electrode assembly includes a fixing ring and a buffer structure connected together. A negative electrode plate is disposed on the inner side of the fixing ring and disposed on one side of the oil mesh so that positively charged oil fume particles are adsorbed onto the negative electrode plate.

[0017] As a preferred embodiment of the present invention, an oil guide groove is provided on the negative electrode plate, and an oil collection cup is provided below the oil guide groove, so that oil fume particles drip down along the oil guide groove into the oil collection cup.

[0018] As a preferred embodiment of the present invention, an oil guiding surface is provided on the side wall of the oil guiding groove. The oil guiding surface is an arc surface, so that the grease formed by the condensation of oil fume particles falls into the oil collecting cup along the arc surface under the action of gravity.

[0019] As a preferred embodiment of the present invention, the negative electrode plate is movably disposed on the inner wall of the fixed ring to adjust the adsorption capacity of the negative electrode plate for charged oil fume particles.

[0020] As a preferred embodiment of the present invention, the negative electrode plate includes two plates, which are respectively connected to the driving structure. The driving structure drives the two negative electrode plates to move closer or further away to change the adsorption capacity for charged oil fume particles.

[0021] As a preferred embodiment of the present invention, the driving structure includes an electric actuator that passes through an opening provided on the fixing ring so as to fix the electric actuator and the negative electrode plate together.

[0022] The range hood provided by this invention has the following advantages:

[0023] (1) The range hood provided by the present invention is connected to the oil mesh through the positive electrode. The oil mesh is provided with positively charged tungsten wire. The positively charged tungsten wire releases static electricity, so that the oil fume particles or dust are charged with positive charge. The negative electrode plate is fixed to the fixing ring by screws to form a positive and negative electric field, which improves the adsorption effect of charged grease on the negative electrode plate, thereby reducing the grease deposition on the oil mesh.

[0024] (2) A buffer structure is provided between the volute assembly and the oil fume collection device. Due to the repulsion between like charges, the positively charged grease slows down when it approaches the buffer structure, so that the charged grease eventually falls onto the negative electrode plate under the action of static electricity, thereby improving the grease collection and adsorption rate. Attached Figure Description

[0025] Figure 1 A cross-sectional view of the range hood provided by the present invention;

[0026] Figure 2 This is an exploded structural diagram of the range hood provided by the present invention;

[0027] Figure 3 Partial structural diagram of the range hood provided by this invention Figure 1 ;

[0028] Figure 4 Partial structural diagram of the range hood provided by this invention Figure 2 ;

[0029] Figure 5 This is a schematic diagram of the structure of the oil fume collection device provided by the present invention;

[0030] Figure 6 This is a cross-sectional view of the oil fume collection device provided by the present invention;

[0031] Figure 7 A partial structural schematic diagram of the oil fume collection device provided by the present invention;

[0032] Figure 8 A schematic diagram of the buffer structure provided by the present invention;

[0033] Figure 9 A schematic diagram of the overall structure of the buffer structure provided by the present invention;

[0034] Figure 10 Schematic diagram of the structure of the oil mesh and tungsten wire assembly provided by the present invention Figure 1 ;

[0035] Figure 11 Schematic diagram of the structure of the oil mesh and tungsten wire assembly provided by the present invention Figure 2 ;

[0036] Figure 12 This is a schematic diagram of the overall structure of the tungsten filament assembly provided by the present invention.

[0037] Explanation of markings in the diagram:

[0038] 1. Housing; 2. Motor; 3. Volute; 31. Front plate; 4. Impeller; 5. Knob structure; 6. Positioning ring; 7. Oil fume collection device; 71. Electric push rod; 72. Fixing ring; 73. Negative electrode plate; 731. Oil guide groove; 732. Oil guide surface; 74. Fastener; 75. Fixing plate; 76. Reinforcing rib; 8. Buffer structure; 81. Connecting rod; 811. Mounting hole; 82. Conical structure; 9. Oil screen; 10. Oil collection cup; 11. Tungsten wire assembly; 111. Electrode wire. Detailed Implementation

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0041] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0042] One embodiment of the present invention provides a range hood for absorbing and filtering cooking fumes. The structure of the range hood described below is illustrated using a side-draft range hood where cooking fumes enter from the side. This embodiment is merely illustrative and does not limit the technical scope of the present application. It is understood that in other embodiments, the range hood may also be a top-draft range hood, where cooking fumes enter from the bottom; this is not limited here.

[0043] Specifically, the range hood includes a main housing 1, a panel assembly, a volute assembly 3, a centrifugal impeller 4, a drive motor 2, and a check valve assembly. The main housing 1 is a hollow shell structure with a right-angled triangular cross-section, and has a main receiving cavity. The panel assembly is installed on one side of the main housing 1. The panel assembly is angled towards the cooking area and includes an upper panel, a lower panel, and an oil filter 9. The oil filter 9 is located between the upper and lower panels, allowing cooking oil to pass through the oil filter 9 into the main receiving cavity of the main housing 1.

[0044] The volute 3 assembly is located within the main receiving cavity of the main housing 1, defining a smoke inlet channel that communicates with the oil mesh 9. The centrifugal impeller 4 is housed within the smoke inlet channel. The drive motor 2 is housed within the main receiving cavity of the main housing 1 and is connected to the centrifugal impeller 4. Driven by the drive motor 2, the centrifugal impeller 4 generates airflow into the smoke inlet channel. A check valve assembly is located at the top of the main housing 1 and connects the smoke inlet channel and the smoke pipe. The check valve assembly prevents smoke from the smoke pipe from flowing back into the smoke inlet channel.

[0045] When the range hood is working, the drive motor 2 drives the centrifugal impeller 4 to rotate and generate centrifugal force, which in turn creates negative pressure in the smoke inlet channel and forms an airflow that flows into the smoke inlet channel. The oil fumes outside the panel assembly pass through the oil mesh 9 and enter the smoke inlet channel, and then pass through the centrifugal impeller 4 and the check valve assembly and are discharged to the outside through the smoke pipe.

[0046] It is understood that the specific structure of the range hood is not the main inventive point of this application. The internal structure of the range hood can be set as needed, and will not be described in detail here.

[0047] During their research, the inventors discovered that the centrifugal impeller 4, used to generate negative pressure, and the volute 3 assembly, used to guide airflow, are core components of the range hood and located in the main area through which cooking fumes flow. Therefore, they are very prone to grease buildup. Grease deposits on the volute 3 assembly and the centrifugal impeller 4 affect the dynamic balance of the centrifugal impeller 4 during rotation, leading to decreased suction power and increased noise, severely impacting the range hood's performance. Furthermore, accumulated grease gradually breeds bacteria and odors, affecting the user experience and health, and causing secondary pollution to the indoor environment. In addition, the high grease content in the fumes emitted from the range hood is detrimental to environmental protection.

[0048] To address the problems caused by grease buildup inside range hoods, most range hoods on the market currently require manual cleaning of the interior, or are equipped with self-cleaning devices for automatic cleaning.

[0049] Manual cleaning requires disassembling the entire range hood, which is difficult for users unfamiliar with its structure and assembly. Hiring professionals for cleaning is time-consuming and expensive, thus affecting the user experience and lifespan of the range hood and causing inconvenience.

[0050] Self-cleaning technologies mainly fall into two categories: steam cleaning and thermal degreasing. Steam cleaning uses a water pump to draw water into a steam generator, which then uses nozzles to wash the inside of the range hood. Thermal degreasing involves heating the inside of the range hood to its melting point, causing the grease to melt and flow out. However, grease is a difficult-to-dissolve stain. During their research, the inventors discovered that the automatic cleaning effect of self-cleaning range hoods was uncontrollable, the self-cleaning devices were complex and consumed large amounts of water, and the wastewater was difficult to collect, thus failing to meet user requirements.

[0051] To solve the above problems, the housing 1 of this application is provided with an oil fume collection device 7. An electric field with adsorption function can be generated between the oil fume collection device 7 and the oil mesh 9, so that the oil fume particles are adsorbed onto the oil fume collection device 7 under the action of the electrostatic field.

[0052] In this way, oil droplets entering the oil mesh 9 can be adsorbed onto the oil fume collection device 7 under the action of the electric field, thereby preventing grease from accumulating on the volute 3 body and the centrifugal impeller 4. This avoids problems such as decreased suction power and increased noise in the range hood equipped with the volute 3 component due to grease accumulation, ensuring that the performance of the range hood is always maintained at a high level. Moreover, the oil fume collection device 7 also improves the grease separation of oil fumes, thereby preventing grease from being emitted into the environment and polluting the air, thus improving the environmental performance of the range hood.

[0053] Please continue reading. Figure 1 The range hood provided by this invention has an oil fume collection device 7 and a volute 3 assembly sequentially arranged inside its housing 1. An oil mesh 9 is provided on the housing 1, which is generally in direct contact with the outside air, allowing cooking fumes to be drawn into the air duct through the oil mesh 9. A positive electrode assembly is fixedly connected to the oil mesh 9. Oil fume particles become positively charged after passing through the positive electrode assembly on the oil mesh 9. A negative electrode assembly is provided on the oil fume collection device 7, attracting the positively charged oil fume particles to the negative electrode assembly, thus achieving the collection of oil fume particles.

[0054] Furthermore, the volute 3 assembly includes a motor 2, which is connected to the impeller 4 and the knob structure 5. The volute 3 assembly is provided with a front plate 31, which is connected to the oil fume collection device 7. The above-mentioned volute 3 assembly is a structure in the prior art, and the specific operation process will not be described in detail here.

[0055] like Figures 10 to 12 As shown, the positive electrode component is a tungsten filament assembly 11, which is fixedly connected to the oil mesh 9. When the tungsten filament assembly 11 is energized, the oil mesh 9 becomes positively charged, thereby making the oil fume particles passing through the oil mesh 9 positively charged. An electrode wire 111 is provided on the tungsten filament assembly 11, which is connected to the power supply to energize the tungsten filament assembly 11.

[0056] Furthermore, the tungsten filament assembly 11 is fixed with 3M adhesive to secure the positively charged tungsten filament, and the tungsten filament assembly 11 is fixed to the oil mesh 9 with silicone adhesive. It is understood that the installation method of the tungsten filament assembly 11 is not limited to this. In some other embodiments, the positive electrode assembly can be installed by integrating the tungsten filament assembly 11 into a mounting frame, and then mounting the mounting frame to the oil mesh 9 using clips or screws.

[0057] Furthermore, in some embodiments, the tungsten filament assembly 11 is disposed at the oil filter 9 at the air inlet of the range hood. The positively charged tungsten filament releases 6000 volts of static electricity, connecting the oil filter 9 to the positive electrode. When the range hood is turned on, as oil fume particles pass through the oil filter 9, the grease becomes positively charged in the positive electric field. When the positively charged grease passes through the oil fume collection device 7, it is attracted to the negative electrode component and eventually adsorbed and collected on the negative electrode component. An electric field with adsorption function can be generated between the positive electrode tungsten filament assembly 11 and the negative electrode component. Thus, after the tungsten filament assembly 11 and the oil fume collection device 7 are energized, an electric field is generated, and oil droplets entering the smoke inlet channel are adsorbed onto the negative electrode component under the adsorption effect of the electric field.

[0058] like Figures 2 to 7 As shown, the oil fume collection device 7 provided by the present invention includes a negative electrode assembly and a buffer structure 8. The negative electrode assembly, buffer structure 8, and volute 3 assembly are coaxially arranged to form an air inlet channel, through which oil fume particles are drawn into the air inlet channel. The coaxial arrangement of the negative electrode assembly, buffer structure 8, and volute 3 assembly maximizes the air intake, thereby drawing more oil fume particles into the air inlet channel.

[0059] In some specific embodiments, the negative electrode assembly includes a fixing ring 72 connected to a buffer structure 8. A negative electrode plate 73 is disposed on the inner side of the fixing ring 72 and is located on one side of the oil mesh 9, so that positively charged oil fume particles are adsorbed onto the negative electrode plate 73. It is understood that the shapes of the accessory assembly, the buffer structure 8, and the volute 3 assembly are adapted to allow more oil fume particles to be drawn into the air intake channel created between the negative electrode assembly, the buffer structure 8, and the volute 3 assembly, thus preventing the oil fume adsorption device from obstructing the air intake channel.

[0060] In some embodiments, the fixing ring 72 is an annular plate structure, and a negative electrode plate 73 is provided on the inner wall of the fixing ring 72. An oil guide groove 731 is provided on the negative electrode plate 73, and an oil collection cup 10 is provided below the oil guide groove 731. Oil fume particles drip down the oil guide groove 731 into the oil collection cup 10. An oil guide surface 732 is provided on the side wall of the oil guide groove 731. The oil guide surface 732 is an arc surface, so that the grease formed by the condensation of oil fume particles falls into the oil collection cup 10 under the action of gravity. When there is a large amount of charged grease in the oil fume, the area of ​​the negative electrode plate 73 affects the adsorption of charged grease to a certain extent. In order to increase the contact area between the negative electrode plate 73 and the grease, an air guide groove is designed on the negative electrode plate 73. This effectively increases the contact area between the negative electrode plate 73 and the grease, and at the same time, the heat on the negative electrode plate 73 is carried away when the oil fume airflow passes through the air guide groove, causing the adsorbed grease to condense and be easily collected into the oil cup.

[0061] In a preferred embodiment, the negative electrode plate 73 is provided with multiple mounting plates, which are perpendicular to the negative electrode plate 73 and are evenly spaced on the negative electrode plate 73. An oil guiding groove 731 is formed between two adjacent mounting plates, so that oil fume particles condense in the oil guiding groove 731 and slide down into the oil collection cup 10 due to gravity. It is understood that the housing 1 of the range hood has an inclined side wall, and the negative electrode assembly is located on one side of the housing 1. The inclination angle of the negative electrode assembly is the same as the inclination angle of the housing 1. Due to the inclined oil guiding surface 732, grease slides down through the oil guiding surface 732 into the oil collection cup 10.

[0062] In some specific embodiments, the surface of the mounting plate is set as an arc surface. The distance between the arc surface of the mounting plate near the buffer structure 8 and the negative electrode plate 73 is greater than the distance between the arc surface of the mounting plate near the oil mesh 9 and the negative electrode plate 73. This allows grease to slide down the arc surface to the oil collection cup 10. The charged grease will eventually adhere to the negative electrode plate 73 under electrostatic adsorption. As the amount of adsorbed grease increases, an oil film will form on the negative electrode plate 73, which will weaken the electrostatic adsorption effect of the negative electrode plate 73 to a certain extent. In order to transfer the grease electrostatically collected by the negative electrode plate 73 in a timely and effective manner, the shape of the air guide channel is designed with an oil guiding arc. The grease adsorbed on the negative electrode plate 73 is subjected to gravity and drips down the oil guiding arc into the inside of the range hood, and finally flows back into the oil cup along the inner wall of the range hood, thereby effectively solving the problem of grease accumulation on the negative electrode plate 73 affecting the electrostatic adsorption effect. Of course, it is understandable that the structure of the mounting plate can be adapted to fit the different shapes of the range hood housing 1, as long as it can maximize the flow of grease particles into the oil collection cup 10.

[0063] Furthermore, the negative electrode plate 73 is movably disposed on the inner wall of the fixing ring 72 to adjust the adsorption capacity of the negative electrode plate 73 for charged oil fume particles. It is understood that adjusting the distance between the two negative electrode plates 73 can adjust the magnitude of the negative electrode electric field, thereby changing the adsorption capacity generated by the negative electrode assembly. In a preferred embodiment, two negative electrode plates 73 are included, each connected to a driving structure. The driving structure drives the two negative electrode plates 73 to move closer or further apart to change the adsorption capacity for charged oil fume particles. The range hood has a large air inlet, and the grease in the fumes is unevenly distributed. Some positively charged grease is far from the negative electrode plate 73 and therefore experiences less electrostatic attraction. Under the suction of the range hood, it is drawn into the volute 3 assembly before reaching the negative electrode plate 73. To effectively improve the adsorption capacity of the negative electrode plate 73 for charged grease, a driving structure is set on the negative electrode plate 73 of the electrostatic fume collection device 7. When the smoke sensor detects that the fume concentration is too high, the negative electrode plate 73 moves towards the center under the action of the driving structure, reducing the distance to the charged grease, effectively improving the electrostatic adsorption force, improving the grease capture efficiency, and preventing grease from escaping.

[0064] In a preferred embodiment, the drive structure includes an electric actuator 71 that passes through an opening in a fixing ring 72 to securely connect the electric actuator 71 to the negative electrode plate 73. A fixing plate 75 is provided on the bottom surface of the electric actuator 71, and the fixing plate 75 is fixedly connected to the fixing ring 72 to more firmly fix the electric actuator 71 to the fixing plate 75. Reinforcing ribs 76 are provided on the fixing plate 75; the number and shape of the reinforcing ribs 76 are not specifically limited here, as long as they serve to strengthen the fixing plate 75. A fixing hole is provided at the end of the electric actuator 71, and the electric actuator 71 and the negative electrode plate 73 are fixedly connected by a fastener 74. Of course, it is understood that the fastener 74 can be a screw or other fixing structure, as long as it can securely connect the electric actuator 71 and the negative electrode plate 73.

[0065] In some embodiments, two negative electrode plates 73 are symmetrically arranged on the inner wall of the fixing ring 72, so that the ends of the two negative electrode plates 73 have a movable distance. Of course, it is understood that the arc length of the negative electrode plate 73 is less than half the arc length of the fixing ring 72, so that the two negative electrode plates 73 can move relative to each other on the inner wall of the fixing ring 72.

[0066] like Figure 8 and Figure 9 As shown, a positive electric field is provided on the buffer structure 8 to slow down the movement of positively charged oil fume particles when they approach the buffer structure 8, thereby adsorbing the positively charged oil fume particles onto the negative electrode component. The charged grease is mainly subjected to two forces: electrostatic force and the negative pressure suction of the range hood. Under the action of the negative pressure suction of the volute 3 component, the grease has an extremely high movement speed. Even with the tangential electrostatic attraction, when the negative pressure suction is much greater than the electrostatic force, the grease will not be able to fall onto the negative electrode plate 73 due to its high speed. Therefore, a buffer structure 8 connected to the positive electrode is designed in the middle of the air inlet duct. Due to the repulsion of like charges, the positively charged grease will slow down to a certain extent when it approaches the conical structure 82, so that the charged grease will eventually fall onto the negative electrode plate 73 under the action of electrostatic force.

[0067] In some specific embodiments, the buffer structure 8 includes a positioning ring 6, with a blocking element at its center. The blocking element carries a positive charge, causing the positively charged oil fume particles to repel each other, thereby reducing the running speed of the oil fume particles. A connecting rod 81 is provided on the outer wall of the blocking element, and the connecting rod 81 is fixedly connected to the side wall of the positioning ring 6, so that the blocking element is fixed on the positioning ring 6. The volute 3 assembly includes a front shell, the side wall of which abuts against the connecting rod 81. The front shell and the positioning ring 6 are fixedly connected by fasteners 74, so that the buffer structure 8 is fixedly disposed between the front shell and the positioning ring 6.

[0068] In a preferred embodiment, the blocking element is a conical structure 82, with the tip of the conical structure 82 facing the negative electrode assembly, so that the oil fume particles move at a reduced speed along the surface of the conical structure 82. The outer wall of the conical structure 82 can guide the oil fume particles. During high-speed operation, the oil fume particles are decelerated by the positively charged conical outer wall and adsorbed onto the negative electrode assembly, so that more oil fume particles are adsorbed onto the negative electrode assembly, preventing the high-speed oil fume particles from directly entering the volute 3 assembly.

[0069] The aforementioned range hood has an oil fume collection device 7 installed inside the housing 1, and a tungsten filament assembly 11 installed on the oil filter 9. This tungsten filament assembly 11 works simultaneously with the range hood. Oil fumes entering the housing 1 are adsorbed onto the oil fume collection device 7 under the influence of an electric field, thus preventing grease from depositing on the volute 3 and centrifugal impeller 4. This prevents the centrifugal impeller 4 from becoming unbalanced due to excessive grease accumulation, thus avoiding a decline in the range hood's performance. Simultaneously, because the oil fume collection device 7 can adsorb grease from the oil fumes, it effectively improves the grease separation rate of the oil fumes, reducing the grease content in the fumes discharged from the range hood and thus improving the environmental performance of the range hood. Compared to existing technologies, the range hood of this application does not require complete disassembly for cleaning the volute 3 assembly and centrifugal impeller 4, nor does it require a complex self-cleaning device, and it does not generate wastewater or other cleaning waste, thus bringing convenience to people's lives without placing additional pressure on environmental protection.

[0070] The range hood provided by this invention connects to the oil filter 9 via a positive electrode. The oil filter 9 contains a positively charged tungsten filament that releases static electricity, causing oil fume particles or dust to become positively charged. A negative electrode plate 73 is fixed to a fixing ring 72 by screws, forming positive and negative electric fields. This enhances the adsorption effect of charged grease on the negative electrode plate 73, reducing grease deposition on the oil filter 9. A buffer structure 8 is provided between the volute 3 assembly and the oil fume collection device 7. Due to the repulsion of like charges, the positively charged grease slows down when it approaches the buffer structure 8, causing the charged grease to eventually fall onto the negative electrode plate 73 under the influence of static electricity, thus improving the grease collection and adsorption rate.

[0071] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A range hood, characterized in that, It includes a housing, inside which a volute assembly and an oil mesh are installed. The volute assembly is connected to an oil fume collection device. The oil mesh and the oil fume collection device can generate an electric field with adsorption function. When the oil fume passes through the oil mesh, it is ionized and charged. The oil fume collection device adsorbs the charged oil fume particles, thereby realizing the collection of oil fume particles. A positive electrode component is installed on the oil mesh to give the oil fume particles a positive charge; a negative electrode component is installed on the oil fume collection device to allow the oil fume particles to be adsorbed onto the oil fume collection device. The fume collection device includes a buffer structure, which is coaxially arranged with the negative electrode component so that charged fume particles are adsorbed onto the negative electrode component. A positive electric field is provided on the buffer structure to slow down the movement of positively charged oil fume particles when they approach the buffer structure, thereby adsorbing the positively charged oil fume particles onto the negative electrode component. The buffer structure includes a positioning ring, with a blocking element at the center of the positioning ring. The blocking element carries a positive charge so that the positively charged oil fume particles and the positively charged blocking element repel each other, thereby reducing the running speed of the oil fume particles. The blocking component has a conical structure with the tip of the conical structure facing the negative electrode assembly, so that the oil fume particles move at a reduced speed along the surface of the conical structure.

2. The range hood according to claim 1, characterized in that, The buffer structure is fixedly connected to the negative electrode assembly, and the buffer structure is located between the negative electrode assembly and the volute assembly.

3. The range hood according to claim 1, characterized in that, A connecting rod is provided on the outer wall of the blocking component, and the connecting rod is fixedly connected to the side wall of the positioning ring so that the blocking component is fixed on the positioning ring.

4. The range hood according to claim 3, characterized in that, The volute assembly includes a front housing, the sidewall of which abuts against a connecting rod. The front housing and the positioning ring are fixedly connected by fasteners so that the buffer structure is fixedly disposed between the front housing and the positioning ring.

5. The range hood according to claim 1, characterized in that, The negative electrode assembly includes a fixing ring and a buffer structure. A negative electrode plate is provided on the inner side of the fixing ring and is located on one side of the oil mesh so that positively charged oil fume particles are adsorbed onto the negative electrode plate.

6. The range hood according to claim 5, characterized in that, An oil guide groove is provided on the negative electrode plate, and an oil collection cup is provided below the oil guide groove. Oil fume particles drip down the oil guide groove into the oil collection cup.

7. The range hood according to claim 6, characterized in that, The side wall of the oil guide groove is provided with an oil guide surface, which is an arc surface, so that the grease formed by the condensation of oil fume particles falls into the oil collection cup along the arc surface under the action of gravity.

8. The range hood according to claim 5, characterized in that, The negative electrode plate is movably mounted on the inner wall of the fixed ring to adjust its adsorption capacity for charged oil fume particles.

9. The range hood according to claim 8, characterized in that, The negative electrode plate consists of two plates, which are connected to the driving structure. The driving structure drives the two negative electrode plates to move closer or further apart to change their adsorption capacity for charged oil fume particles.

10. The range hood according to claim 9, characterized in that, The drive structure includes an electric actuator that passes through an opening in the fixing ring to fix the electric actuator and the negative electrode plate.

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