An internal circulation range hood

Abstract

The application relates to the technical field of range hood, in particular to an inner circulation range hood, which comprises a smoke collecting cavity, an air duct system and a filtering system; the filtering system comprises a double-layer filtering assembly located at the air inlet of the smoke collecting cavity and an inner exhaust system located at the end of the air outlet of the air duct system; the double-layer filtering assembly comprises a first layer of oil-repellent filter screen and a second layer of activated carbon screen, the oil-repellent filter screen is used for separating oil stains, and the activated carbon screen is used for adsorbing gaseous pollutants; the inner exhaust system comprises a telescopic flue and an upper filtering assembly, one end of the telescopic flue is connected with the air duct system, the other end is connected with the upper filtering assembly, and the upper filtering assembly is communicated with an indoor space. Compared with the prior art, the application can flexibly adapt to the installation requirements of small-size spaces under the premise of ensuring effective filtering of oil fume, avoids the use of complex ion generators and other components, simplifies the internal structure and reduces the cost, so that an optimal balance among filtering efficiency, maintenance convenience, cost control and space adaptability is realized.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and more particularly to an internal circulation range hood. Background Technology

[0002] In the field of internal circulation range hoods, existing technologies mainly target specific scenarios where external exhaust of cooking fumes is not possible, such as apartments or rental properties without shared exhaust ducts or exhaust windows, as well as situations where external exhaust is restricted because the emission of cooking fumes may affect neighbors or the appearance of the city. These technologies provide different solutions to achieve internal circulation of cooking fumes.

[0003] In existing solutions, some use a filter grille with activated carbon fiber installed on the top of the range hood to filter the oil fumes; others use a centrifugal fan to separate the oil fumes and combine it with components such as a negative ion generator and activated carbon honeycomb panels to purify different pollutants in the oil fumes.

[0004] However, existing technologies have significant shortcomings. Some solutions rely directly on activated carbon cotton filtration without pre-separating the oil fumes, resulting in frequent filter material replacements. Furthermore, the filter grilles are inconvenient for users to disassemble and maintain, and the lack of decorative design affects aesthetics. Other solutions, while having good performance, have complex internal structures, high costs, and large equipment sizes, making them unsuitable for space-constrained scenarios such as budget apartments and rental properties. They struggle to achieve a good balance between filtration efficiency, ease of maintenance, cost control, and space adaptability. Utility Model Content

[0005] This application provides an internal circulation range hood to solve the technical problem that existing technologies struggle to achieve a good balance in terms of filtration efficiency, ease of maintenance, cost control, and space adaptability.

[0006] This application provides an internal circulation range hood, including: a smoke collection chamber, an air duct system, and a filtration system;

[0007] The filtration system includes a double-layer filtration assembly located at the air inlet of the smoke collection chamber, and an internal exhaust system located at the end of the air outlet of the duct system.

[0008] The dual-layer filtration assembly includes an oleophobic filter screen as the first layer and an activated carbon screen as the second layer. The oleophobic filter screen is used to separate oil and grease, and the activated carbon screen is used to adsorb gaseous pollutants.

[0009] The internal exhaust system includes a telescopic smoke pipe and an upper filter assembly. One end of the telescopic smoke pipe is connected to the air duct system, and the other end is connected to the upper filter assembly. The upper filter assembly is connected to the indoor space.

[0010] Furthermore, the dual-layer filter assembly also includes a filter screen support and an activated carbon support, the filter screen support and the activated carbon support are connected, the oleophobic filter screen is detachably connected to the filter screen support, and the activated carbon screen is detachably connected to the activated carbon support.

[0011] Furthermore, the oleophobic filter is an aluminum filter with an oleophobic coating on its surface; the main structure of the activated carbon mesh is a honeycomb-shaped PP flame-retardant mesh, with multiple activated carbon particles placed in each mesh hole; the PP flame-retardant mesh has a flame-retardant nylon mesh in front and a flame-retardant fiber filter cotton in the back, and its outer edge is fixed by a frame.

[0012] Furthermore, the double-layer filter assembly is flush with the surface of the air inlet of the smoke collection chamber to form an oil guiding slope. An oil cup is provided below the double-layer filter assembly. The oil in the smoke flows into the oil cup through the oil guiding slope after being filtered by the double-layer filter assembly.

[0013] Furthermore, the internal exhaust system also includes an upper decorative cover, which is installed inside the upper decorative cover along with the telescopic smoke pipe. Exhaust ports are provided on both sides of the upper decorative cover, and the air outlet of the upper filter assembly is connected to the exhaust ports.

[0014] Furthermore, the upper filter assembly includes an activated carbon box, an upper mounting plate, and two activated carbon blocks. The upper mounting plate is installed on the top of the activated carbon box, and the two activated carbon blocks are detachably installed on both sides of the activated carbon box.

[0015] Furthermore, the activated carbon block is provided with a sealing element and an activated carbon cover near the exhaust port. The activated carbon cover is located on the outside of the activated carbon block, and the sealing element is located between the activated carbon cover and the activated carbon block. A support plate is also provided on the side of the activated carbon block away from the exhaust port. The height of the support plate is higher than the bottom of the activated carbon block to support and limit the activated carbon block.

[0016] Furthermore, the activated carbon box has an air inlet channel at the bottom, and a hollow adapter is provided at the air inlet channel, with the telescopic smoke pipe connected to the adapter.

[0017] Furthermore, a lower decorative cover is provided below the upper decorative cover, the air duct system is installed inside the lower decorative cover, the upper decorative cover is inserted into the lower decorative cover, and the height of the upper decorative cover is adjusted according to the telescopic length of the telescopic smoke pipe.

[0018] Furthermore, the smoke collection chamber is also equipped with a flip-type smoke collection glass, which is rotatably connected to the smoke collection chamber. When the smoke machine is turned off, the flip-type smoke collection glass covers the air inlet of the smoke collection chamber. When the smoke machine is turned on, the flip-type smoke collection glass opens to form a smoke collection plate, and at the same time, the air inlet of the smoke collection chamber opens.

[0019] The technical solution provided in this application has the following advantages compared with the prior art:

[0020] This application utilizes a double-layer filtration system at the air inlet of the smoke collection chamber. The first layer, an oleophobic filter, pre-separates oil and significantly reduces the oil load on the second layer, the activated carbon filter, extending its effective lifespan and reducing replacement frequency. Furthermore, placing the filtration system at the air inlet, compared to the traditional top-mounted design, facilitates direct disassembly and maintenance, and the rational structural design enhances the equipment's aesthetics. In addition, the internal exhaust system at the end of the ductwork uses a telescopic smoke pipe in conjunction with the upper filtration system. This allows for flexible installation in small spaces while ensuring effective filtration of oil fumes, avoiding the use of complex ion generators and other components, simplifying the internal structure and reducing costs. This achieves an optimized balance between filtration efficiency, ease of maintenance, cost control, and space adaptability, making it more suitable for limited spaces such as apartments and rental properties. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0024] Figure 1 This is a schematic diagram of the structure of an internal circulation range hood provided in an embodiment of this application;

[0025] Figure 2 for Figure 1 Another perspective structural diagram;

[0026] Figure 3 for Figure 1 Exploded view of the dual-layer filter assembly;

[0027] Figure 4 for Figure 1 A partial structural exploded view of the upper and middle filter components;

[0028] Figure 5for Figure 4 Partial exploded view;

[0029] Figure 6 for Figure 1 Exploded view of the upper and middle filter components.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1. Smoke collection chamber; 11. Oil cup; 12. Flip-type smoke collection glass;

[0032] 2. Air duct system; 21. Lower decorative cover;

[0033] 3. Filtration system; 31. Double-layer filter assembly; 311. Oil-repellent filter screen; 312. Activated carbon screen; 313. Filter screen support; 314. Activated carbon support; 32. Internal exhaust system; 321. Upper filter assembly; 3211. Activated carbon box; 3212. Upper mounting plate; 3213. Activated carbon block; 3214. Sealing element; 3215. Activated carbon cover; 3216. Support plate; 322. Telescopic flue; 323. Upper decorative cover; 3231. Exhaust port; 324. Air intake channel; 325. Adapter. Detailed Implementation

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] The following disclosure provides numerous different embodiments or examples for implementing various structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples. Such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0036] For ease of description, spatial relative terms may be used in the text to describe the relative position or movement of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "front," "back," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure undergoes a positional flip, orientation change, or change of motion, these directional indications will change accordingly. For instance, an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions), and the spatial relative descriptors used in the text will be interpreted accordingly.

[0037] To address the technical challenge of achieving a good balance between filtration efficiency, ease of maintenance, cost control, and space adaptability in existing technologies, this application provides an internal circulation range hood. This hood utilizes a double-layer filter assembly 31 at the air inlet of the smoke collection chamber 1. The first layer, an oleophobic filter 311, pre-separates oil and significantly reduces the oil load on the second layer, the activated carbon filter 312, extending its effective lifespan and reducing the frequency of replacement. Simultaneously, the internal exhaust system 32 at the end of the duct system 2 employs a telescopic smoke pipe 322 in conjunction with the upper filter assembly 321. This allows for flexible adaptation to small-space installation requirements while ensuring effective filtration of oil fumes, avoiding the use of complex ion generators and other components, simplifying the internal structure, and reducing costs. Thus, an optimized balance is achieved between filtration efficiency, ease of maintenance, cost control, and space adaptability.

[0038] Please see Figures 1 to 6 This application provides an internal circulation range hood, comprising: a smoke collection chamber 1, an air duct system 2, and a filtration system 3; the filtration system 3 includes a double-layer filter assembly 31 located at the air inlet of the smoke collection chamber 1, and an internal exhaust system 32 located at the air outlet of the air duct system 2; the double-layer filter assembly 31 includes a first layer of oleophobic filter 311 and a second layer of activated carbon mesh 312, the oleophobic filter 311 being used to separate oil stains, and the activated carbon mesh 312 being used to adsorb gaseous pollutants; the internal exhaust system 32 includes a telescopic smoke pipe 322 and an upper filter assembly 321, one end of the telescopic smoke pipe 322 being connected to the air duct system 2, and the other end being connected to the upper filter assembly 321, the upper filter assembly 321 being connected to the indoor space.

[0039] Specifically, in the implementation of the internal circulation range hood of this application, the fumes are first collected through the fume collection chamber 1 and then processed by the double-layer filter assembly 31 at the air inlet. The first layer of oleophobic filter 311 separates the oil stains in the fumes, and the second layer of activated carbon mesh 312 adsorbs the remaining gaseous pollutants. The preliminarily purified gas enters the duct system 2 and is transported to the internal exhaust system 32 at the end of the air outlet. In the internal exhaust system 32, one end of the telescopic smoke pipe 322 is connected to the duct system 2, and the other end is connected to the upper filter assembly 321. The gas is further processed by the upper filter assembly 321 and then connected to the indoor space to form an internal circulation. This structure achieves the stratified treatment of oil stains and gaseous pollutants through the graded purification of the double-layer filter assembly 31. Combined with the secondary filtration of the internal exhaust system 32 at the end of the duct system 2 and the flexible connection of the telescopic smoke pipe 322, the fume purification is completed and connected to the indoor environment without external exhaust, meeting the internal circulation requirements of specific scenarios.

[0040] like Figure 1-3 As shown, the dual-layer filter assembly 31 also includes a filter screen support 313 and an activated carbon support 314. The filter screen support 313 and the activated carbon support 314 are connected. The oleophobic filter screen 311 is detachably connected to the filter screen support 313, and the activated carbon screen 312 is detachably connected to the activated carbon support 314.

[0041] Specifically, the dual-layer filter assembly 31 is fixed by a filter screen support 313 and an activated carbon support 314, respectively. The two are mechanically connected to each other to form a stable support frame. The filter screen support 313 is located at the front end of the dual-layer filter assembly 31, and the activated carbon support 314 is located at the rear end, forming a spatially layered layout. The oleophobic filter screen 311 is detachably connected to the filter screen support 313 via a snap-fit ​​or sliding rail structure; the activated carbon screen 312 is detachably connected to the activated carbon support 314 via a knob or plug-in interface. Users can independently disassemble the oleophobic filter screen 311 (to clean oil stains) or the activated carbon screen 312 (to replace the adsorption material) without disassembling the entire filter system 3.

[0042] In an optional embodiment, the oleophobic filter 311 is an aluminum filter with an oleophobic coating on its surface; the main structure of the activated carbon mesh 312 is a honeycomb-shaped PP flame-retardant mesh, with multiple activated carbon particles placed in each mesh hole, a flame-retardant nylon mesh in front of the PP flame-retardant mesh, a flame-retardant fiber filter cotton in the back, and the outer edge is fixed by a frame.

[0043] Specifically, in practical applications, the oleophobic filter 311 and activated carbon mesh 312 in this embodiment form an oil-stain separation layer by combining the aluminum filter with an oleophobic coating. The oleophobic properties of the coating make it easier for oil droplets in the fumes to adhere and collect before being discharged. The honeycomb-shaped PP flame-retardant mesh of the activated carbon mesh 312 provides a supporting carrier for the activated carbon particles. The flame-retardant nylon mesh and flame-retardant fiber filter cotton placed at the front and back respectively play a protective and auxiliary filtration role. The frame fixes each layer of the structure to form a whole. This structure improves oil-stain separation efficiency and facilitates filter cleaning through the oleophobic coating. The honeycomb mesh design increases the contact area between the activated carbon particles and the gas to enhance the adsorption effect. The combination of multiple flame-retardant materials improves safety while achieving pollutant filtration, and the fixed frame ensures stable connection of all components.

[0044] Furthermore, such as Figure 3 As shown, the upper parts of the filter support 313 and activated carbon support 314 are connected by means of rivets, and their lower parts are respectively fixed to the smoke collection chamber 1 of the range hood, forming a stable triangular connection. The first layer of the air intake filter assembly consists of two aluminum filters arranged side by side. The aluminum filters are made up of multiple layers of porous aluminum mesh stacked together. The holes are generally spatial rhomboid in shape. When stacked, the size and position of the holes in each layer are staggered to increase the contact area with the oil fumes. They are fixed with a frame, and quick-release buckles are installed on the upper part and pins are installed on the lower part to fix them inside the aluminum filter support 313. The oil fumes filtered by the aluminum filter will pass through the second layer of activated carbon mesh 312. The number of activated carbon meshes 312 corresponds to the number of aluminum filters. The whole is fixed with an aluminum frame, with pins on the lower part and a fixed piece with holes on the upper part. The activated carbon mesh 312 is fixed in the activated carbon mesh 312 support using screws with anti-slip heads that do not require tools, so that it can be quickly removed and replaced.

[0045] It is understood that, in addition to aluminum, the oleophobic filter 311 in this embodiment can also be made of metal materials such as stainless steel or galvanized steel, or non-metallic materials such as polypropylene (PP) or ABS engineering plastics, depending on the specific circumstances. Metal materials can achieve oil-stain separation through surface oleophobic coating treatment, combining corrosion resistance and structural strength; non-metallic materials can achieve the same oleophobic effect by relying on their own surface characteristics or additional coating design, and have the advantages of being lightweight and cost-effective. All types of materials can meet the requirements for intercepting and separating oil droplets in cooking fumes.

[0046] As shown in 1-2, the double-layer filter assembly 31 is flush with the air inlet surface of the smoke collection chamber 1 to form an oil guiding slope. An oil cup 11 is provided below the double-layer filter assembly 31. The oil in the smoke flows into the oil cup 11 through the oil guiding slope after being filtered by the double-layer filter assembly 31.

[0047] Specifically, the double-layer filter assembly 31 and the air inlet of the smoke collection chamber 1 are installed in a planar alignment manner. The surface of the assembly and the surface of the air inlet form a continuous flat slope, and the slope angle design conforms to the characteristics of fluid mechanics. The oil cup 11 is directly set below the double-layer filter assembly 31. The oil guiding slope extends to the edge of the opening of the oil cup 11 to form a guide channel. The surface of the assembly is specially treated to enhance the flow performance of oil. When the high-temperature oil and gas rise and encounter the aluminum filter screen, they will condense on the porous aluminum filter screen surface. After accumulation, they flow into the oil cup 11 along the aluminum filter screen surface and the surface of the range hood, without dripping onto the stove. The activated carbon mesh 312 and the bracket are set inside the air inlet of the smoke collection chamber 1. A small amount of oil accumulation will also flow into the oil cup 11 along the inside of the smoke collection chamber 1.

[0048] like Figure 1 and Figure 4-6 As shown, the internal exhaust system 32 also includes an upper decorative cover 323. The upper decorative cover 323 and the telescopic smoke pipe 322 are installed inside the upper decorative cover 323. Both sides of the upper decorative cover 323 are provided with exhaust ports 3231. The air outlet of the upper filter assembly 321 is connected to the exhaust port 3231.

[0049] Specifically, the upper decorative cover 323 completely covers the telescopic flue 322 and the upper filter assembly 321, forming a sealed cavity. The dual exhaust port 3231 design features symmetrical gas emission channels on the left and right side walls of the decorative cover. The airflow connection structure allows direct connection between the air outlet of the upper filter assembly 321 and the exhaust port 3231 of the decorative cover, eliminating the need for detours. In this structure, the upper decorative cover 323 serves both a protective function and a gas guiding function. The dual exhaust ports 3231 achieve equal pressure distribution of airflow, allowing purified gas to be directly discharged into the indoor space via the upper decorative cover 323, thus ensuring smooth internal circulation. Simultaneously, the integrated design eliminates traditional bypass pipes, improving space utilization.

[0050] like Figure 5-6 As shown, the upper filter assembly 321 includes an activated carbon box 3211, an upper mounting plate 3212, and two activated carbon blocks 3213. The upper mounting plate 3212 is installed on the top of the activated carbon box 3211, and the two activated carbon blocks 3213 are detachably installed on both sides of the activated carbon box 3211.

[0051] Specifically, the activated carbon box 3211 serves as the core carrier, providing a gas filtration chamber. Its hollow internal structure accommodates activated carbon blocks 3213. An upper mounting plate 3212 is fixed to the top of the activated carbon box 3211, anchoring the entire upper filter assembly 321 to a wall or ceiling. The activated carbon blocks 3213 consist of two independent units, detachably mounted on the left and right sides of the activated carbon box 3211 via sliding rails or snap-fit ​​mechanisms. Purified gas enters the activated carbon box 3211 through the telescopic flue 322, adsorbs residual pollutants by the activated carbon blocks 3213 on both sides, and is then discharged. When disassembly is required, the user can independently remove either the left or right activated carbon block 3213 for cleaning or replacement without disassembling the entire assembly. This structure creates a parallel adsorption path between the activated carbon blocks 3213 on both sides, doubling the filtration area and significantly improving the removal rate of gaseous pollutants. Furthermore, if one activated carbon block 3213 fails, the other side maintains basic filtration functionality.

[0052] like Figure 5-6 As shown, the activated carbon block 3213 is also provided with a sealing element 3214 and an activated carbon cover 3215 near the exhaust port 3231. The activated carbon cover 3215 is located on the outside of the activated carbon block 3213, and the sealing element 3214 is located between the activated carbon cover 3215 and the activated carbon block 3213. The side of the activated carbon block 3213 away from the exhaust port 3231 is also provided with a support plate 3216. The height of the support plate 3216 is higher than the bottom of the activated carbon block 3213 to support and limit the activated carbon block 3213.

[0053] Specifically, the upper mounting plate 3212 fixes the entire assembly to a suitable position on the wall. Activated carbon is installed on both sides of the internal exhaust system 32. The activated carbon is a one-piece molded honeycomb structure and can be removed or inserted from its respective side along with the activated carbon cover 3215. The sealing element 3214 is made of sealing silicone, which serves to seal and limit the activated carbon cover 3215. The support plate 3216 installed inside supports the activated carbon and limits its depth. The activated carbon box 3211 redirects the vertical airflow to the horizontal sides.

[0054] like Figure 6 As shown, the activated carbon box 3211 has an air inlet channel 324 at the bottom, and a hollow adapter 325 is provided at the air inlet channel 324. The telescopic smoke pipe 322 is connected to the adapter 325.

[0055] Specifically, in this embodiment, a dedicated air inlet channel 324 is provided at the center of the bottom of the activated carbon box 3211. The adapter 325 adopts a cylindrical or conical hollow structure with a smooth and unobstructed inner wall. The lower end of the adapter 325 is connected to the telescopic smoke pipe 322 by an interference fit or thread, and the upper end of the adapter 325 forms a flange-type sealed connection with the air inlet channel 324. The air inlet channel 324 serves as the inlet for gas to enter the activated carbon box 3211. The hollow adapter 325 connects the telescopic smoke pipe 322 and the air inlet channel 324, forming an airflow transmission path, allowing the gas discharged from the air duct system 2 to enter the interior of the activated carbon box 3211 through the telescopic smoke pipe 322 and the adapter 325. This structure, through the hollow design and positioning of the adapter 325, ensures the smooth introduction of gas from the telescopic smoke pipe 322 to the activated carbon box 3211, while utilizing the connecting function of the adapter 325 to achieve a stable connection between the telescopic smoke pipe 322 and the activated carbon box 3211.

[0056] like Figure 2 As shown, a lower decorative cover 21 is provided below the upper decorative cover 323. The air duct system 2 is installed inside the lower decorative cover 21, and the upper decorative cover 323 is inserted into the lower decorative cover 21. The height of the upper decorative cover 323 is adjusted according to the telescopic length of the telescopic smoke pipe 322.

[0057] Specifically, the upper decorative cover 323 is located directly above the lower decorative cover 21, forming a vertically stacked structure. The lower decorative cover 21 serves as a fixed base, housing the air duct system 2. The upper decorative cover 323 is inserted into the lower decorative cover 21 via a plug-in method (such as a sleeve or slide rail structure), achieving a seamless connection. The telescopic movement of the telescopic flue 322 directly drives the upper decorative cover 323 to move up and down. When the telescopic flue 322 extends, the upper decorative cover 323 rises; when the telescopic flue 322 shortens, the upper decorative cover 323 lowers (the adjustable height of the upper decorative cover 323 is not less than 250mm, adapting to different installation heights). The adjustment process is completed through the physical deformation of the flue, requiring no additional power device.

[0058] like Figure 2 As shown, the smoke collection chamber 1 is also equipped with a flip-plate smoke collection glass 12. The flip-plate smoke collection glass 12 is rotatably connected to the smoke collection chamber 1. When the smoke machine is turned off, the flip-plate smoke collection glass 12 covers the air inlet of the smoke collection chamber 1. When the smoke machine is turned on, the flip-plate smoke collection glass 12 opens to form a smoke collection plate, and at the same time, the air inlet of the smoke collection chamber 1 opens.

[0059] Specifically, the flip-type smoke collection glass 12 is connected to the side wall of the smoke collection chamber 1 via a hinge or pivot, achieving a rotation range of 0°-90°. A damping structure is incorporated in the rotating parts to ensure smooth opening and closing. In the off state, the flip-type glass completely covers the air inlet of the smoke collection chamber 1, forming a sealed surface. In the on state, the flip-type glass rotates open to a preset angle (e.g., 30°-90°), forming a guide smoke collection plate, simultaneously opening the air inlet of the smoke collection chamber 1 to provide a channel for the intake of cooking fumes. This structure, through its rotating connection design, allows the flip-type smoke collection glass 12 to function as both an air inlet shield and a smoke collection plate. When off, it prevents dust and debris from entering the smoke collection chamber 1, keeping the interior clean; when on, the unfolded smoke collection plate expands the area where cooking fumes gather, and together with the opening of the air inlet, improves the efficiency of fume collection.

[0060] like Figure 1-2 As shown, the range hood is in the shape of a "7" and has an ultra-thin, close-range suction design. Its small exposed volume does not obstruct the pot. At the same time, the internal exhaust system 32 of the upper decorative cover 323, with its filtration method and adjustable height structure, can be matched with any type of range hood, such as European style or side suction type.

[0061] Specifically, the range hood adopts an ultra-thin, near-suction design in the shape of a "7". Its overall shape is slanted, with a thin body that sits close to the cooktop area. The exposed portion is compact, allowing it to be placed above or on top of cookware without obstructing the cooking space. The upper decorative cover 323, as part of the internal exhaust system 32, integrates a filter component to purify the gas exhausted from the duct system 2. The upper decorative cover 323 is connected to the main body of the range hood (or the lower decorative cover 21 or the main body) via a plug-in or sliding structure, and its height can be adjusted vertically to match the top space structure of different range hood types (such as European-style and side-suction types).

[0062] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0063] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0064] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0065] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0066] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification should not be construed as necessarily referring to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0068] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Since these modifications and variations fall within the scope of the claims and their equivalents, this application also intends to include these modifications and variations.

[0069] The above description describes specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A range hood with internal circulation, characterized in that, include: Smoke collection chamber, air duct system and filtration system; The filtration system includes a double-layer filtration assembly located at the air inlet of the smoke collection chamber, and an internal exhaust system located at the end of the air outlet of the duct system. The dual-layer filtration assembly includes an oleophobic filter screen as the first layer and an activated carbon screen as the second layer. The oleophobic filter screen is used to separate oil and grease, and the activated carbon screen is used to adsorb gaseous pollutants. The internal exhaust system includes a telescopic smoke pipe and an upper filter assembly. One end of the telescopic smoke pipe is connected to the air duct system, and the other end is connected to the upper filter assembly. The upper filter assembly is connected to the indoor space.

2. The internal circulation range hood according to claim 1, characterized in that, The dual-layer filter assembly also includes a filter screen support and an activated carbon support, the filter screen support and the activated carbon support are connected, the oleophobic filter screen is detachably connected to the filter screen support, and the activated carbon screen is detachably connected to the activated carbon support.

3. The internal circulation range hood according to claim 2, characterized in that, The oleophobic filter is an aluminum filter with an oleophobic coating on its surface; the main structure of the activated carbon mesh is a honeycomb-shaped PP flame-retardant mesh, with multiple activated carbon particles placed in each mesh hole. The PP flame-retardant mesh is provided with a flame-retardant nylon mesh in front and a flame-retardant fiber filter cotton in the back, and its outer edge is fixed by a frame.

4. The internal circulation range hood according to claim 1 or 3, characterized in that, The dual-layer filter assembly is flush with the surface of the air inlet of the smoke collection chamber to form an oil guiding slope. An oil cup is provided below the dual-layer filter assembly. The oil in the smoke flows into the oil cup through the oil guiding slope after being filtered by the dual-layer filter assembly.

5. The internal circulation range hood according to claim 1, characterized in that, The internal exhaust system also includes an upper decorative cover, which is installed inside the upper decorative cover along with the telescopic smoke pipe. Both sides of the upper decorative cover are provided with exhaust ports, and the air outlet of the upper filter assembly is connected to the exhaust ports.

6. The internal circulation range hood according to claim 5, characterized in that, The upper filter assembly includes an activated carbon box, an upper mounting plate, and two activated carbon blocks. The upper mounting plate is installed on the top of the activated carbon box, and the two activated carbon blocks are detachably installed on both sides of the activated carbon box.

7. The internal circulation range hood according to claim 6, characterized in that, The activated carbon block is also provided with a sealing element and an activated carbon cover near the exhaust port. The activated carbon cover is located on the outside of the activated carbon block, and the sealing element is located between the activated carbon cover and the activated carbon block. The activated carbon block is also provided with a support plate on the side away from the exhaust port. The height of the support plate is higher than the bottom of the activated carbon block to support and limit the activated carbon block.

8. The internal circulation range hood according to claim 7, characterized in that, The activated carbon box has an air inlet channel at the bottom, and a hollow adapter is provided at the air inlet channel. The telescopic smoke pipe is connected to the adapter.

9. The internal circulation range hood according to claim 5, characterized in that, A lower decorative cover is provided below the upper decorative cover. The air duct system is installed inside the lower decorative cover. The upper decorative cover is inserted into the lower decorative cover. The height of the upper decorative cover is adjusted according to the telescopic length of the telescopic smoke pipe.

10. The internal circulation range hood according to claim 1, characterized in that, The smoke collection chamber is also equipped with a flip-type smoke collection glass, which is rotatably connected to the smoke collection chamber. When the smoke machine is turned off, the flip-type smoke collection glass covers the air inlet of the smoke collection chamber. When the smoke machine is turned on, the flip-type smoke collection glass opens to form a smoke collection plate, and at the same time, the air inlet of the smoke collection chamber opens.

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