Range hood with self-cleaning oil fume filter

Abstract

This utility model belongs to the field of range hood technology, specifically relating to a range hood with a self-cleaning oil fume filter. This range hood uses filter cotton with a gap layer instead of traditional activated carbon to filter oil fumes. This not only solves the problem of frequent oil retention and replacement after activated carbon becomes saturated, but also utilizes the gap structure of the filter cotton to allow the adsorbed oil to be automatically discharged by gravity, thus extending its service life. Furthermore, the filter cotton's flexibility effectively avoids noise problems caused by airflow vibration. The filter cotton can also be made of high-temperature resistant and flame-retardant materials, effectively eliminating the safety hazards posed by flammable materials. Its self-draining oil function effectively prevents the accumulation of large amounts of oil and mold growth, achieving self-cleaning while ensuring efficient oil fume filtration. This utility model has the advantages of simple and reliable structure, convenient maintenance, and safe and hygienic use.

Description

Technical Field

[0001] This utility model belongs to the field of range hood technology, specifically relating to a range hood with a self-cleaning oil fume filter. Background Technology

[0002] In existing range hood technology, to reduce the accumulation of cooking fumes inside the hood and decrease the frequency of internal cleaning, an activated carbon filter structure has been added. This solution relies on the adsorption function of activated carbon to reduce cooking fumes inside the range hood. However, activated carbon as a filter has many drawbacks: once saturated, the oil cannot be discharged from the activated carbon by its own weight, leading to frequent replacement of the activated carbon filter structure over long-term use; at the same time, cooking fumes accumulated in the activated carbon over a long period of time are prone to mold and odor, affecting kitchen hygiene; in addition, the granular activated carbon vibrates when the range hood is drawing in air, generating additional noise. Utility Model Content

[0003] The purpose of this invention is to overcome the problems of frequent replacement, easy mold growth and odor, and high noise in existing range hoods that use activated carbon as the filter structure, and to provide a range hood with a self-cleaning filter that uses filter cotton for oil fume filtration.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A range hood with a self-cleaning oil fume filter includes a range hood housing, within which a fan system is installed. The fan system includes a motor, an impeller, and a volute. The impeller is located inside the volute, and the motor is driven by the impeller. The air inlet and outlet of the volute are connected to the air inlet and outlet of the range hood housing, respectively. A filter is installed at the air inlet and / or outlet of the volute housing. The filter includes a filter housing and filter floss disposed within the filter housing. The filter floss comprises multiple overlapping layers, with the gaps between the layers set at an angle parallel to or less than 45° to the direction of gravity. Preferably, the gaps between the layers are set at an angle parallel to or less than 30° to the direction of gravity.

[0005] Compared with existing technologies, the range hood with a self-cleaning oil fume filter of this utility model uses filter cotton with a gap layer to replace traditional activated carbon for filtering oil fumes. This not only solves the problem of "activated carbon becoming saturated and prone to oil fume penetration after adsorption, leading to frequent replacements," but also allows the oil adsorbed by the filter cotton to be automatically discharged along the gap layer by its own gravity, achieving regeneration and extending its service life. It also effectively prevents the accumulation of oil stains and mold growth. In addition, the filter cotton is a porous and flexible material that will not vibrate due to the air intake of the range hood and has a certain sound absorption effect. At the same time, the filter cotton can be made of high-temperature resistant and flame-retardant cotton material, which can effectively eliminate the risk of combustion. The filter cotton achieves self-cleaning function while ensuring efficient oil fume filtration, and has the advantages of reliable function, safety and hygiene, and cost-effectiveness.

[0006] A range hood with a self-cleaning oil fume filter includes a range hood housing, within which a range hood duct and a fan are located. The range hood housing also has a range hood inlet and an air outlet communicating with the range hood duct. A filter is installed in the range hood inlet, air outlet, or range hood duct. The filter includes a filter housing and filter floss disposed within the filter housing. The filter floss comprises multiple stacked layers, with the gaps between the layers set at an angle parallel to or less than 45° to the direction of gravity. Preferably, the gaps between the layers are set at an angle parallel to or less than 30° to the direction of gravity.

[0007] Compared with existing technologies, the range hood with a self-cleaning oil fume filter of this utility model uses filter cotton with a gap layer to replace traditional activated carbon for filtering oil fumes. This not only solves the problem of "activated carbon becoming saturated and prone to oil fume penetration after adsorption, leading to frequent replacements," but also allows the oil adsorbed by the filter cotton to be automatically discharged along the gap layer by its own gravity, achieving regeneration and extending its service life. It also effectively prevents the accumulation of oil stains and mold growth. In addition, the filter cotton is a porous and flexible material that will not vibrate due to the air intake of the range hood and has a certain sound absorption effect. At the same time, the filter cotton can be made of high-temperature resistant and flame-retardant cotton material, which can effectively eliminate the risk of combustion. The filter cotton achieves self-cleaning function while ensuring efficient oil fume filtration, and has the advantages of reliable function, safety and hygiene, and cost-effectiveness.

[0008] Furthermore, it also includes an oil collection tank for collecting oil stains, which is connected to the filter; in addition to its oil absorption function, the filter cotton is designed in such a way that the oil inside the filter cotton is discharged into the oil collection tank under the action of gravity, thereby achieving efficient oil fume filtration while also realizing a self-cleaning function.

[0009] Furthermore, the cotton layer includes multiple first and second cotton layers stacked at intervals. The mass per unit volume of the second cotton layer is lighter than that of the first cotton layer. The second cotton layer is set to be parallel to the direction of gravity or at an angle of less than 45°. Preferably, the mass per unit volume of the second cotton layer is lighter than that of the first cotton layer, and the second cotton layer is set to be parallel to the direction of gravity or at an angle of less than 30°. With this arrangement, the cotton layers can simultaneously absorb oil and allow the absorbed oil to be automatically discharged between the cotton layers by gravity, thereby extending its service life and ensuring efficient oil fume filtration while achieving a self-cleaning function.

[0010] Furthermore, the thickness of the second layer is less than that of the first layer; the average porosity of the second layer is greater than that of the first layer; this configuration allows the second layer to have a better oil fume adsorption effect.

[0011] Furthermore, the surfaces of each cotton layer are bonded together by low-melting-point fibers; this arrangement allows the cotton layers to be connected and formed by low-melting-point fibers, resulting in a good overall structural shape of the filter cotton.

[0012] Furthermore, the gap between each cotton layer is set at an angle parallel to or less than 45° to the ventilation direction. Preferably, the gap between each cotton layer is set at an angle parallel to or less than 45° to the ventilation direction.

[0013] Furthermore, the cotton layer is integrally formed with at least one end of its adjacent cotton layer, and the integrally formed end is not located on the lower side when the filter cotton is installed; all cotton layers are configured to be integrally formed with adjacent cotton layers.

[0014] Alternatively, a fiber-shaping thin layer bonded with low-melting-point fibers may be provided on one side of the filter cotton, and the fiber-shaping thin layer is not located on the underside of the filter cotton when it is installed.

[0015] Furthermore, the filter cotton contains water-repellent fibers mixed and intertwined; or, the filter cotton contains water-repellent fibers and flame-retardant fibers mixed and intertwined.

[0016] Furthermore, the filter housing has a placement cavity with an opening on one side, in which the filter cotton is placed. The other side of the filter housing has an air inlet mesh. The placement cavity is rectangular or circular, and the shape of the filter cotton corresponds to the shape of the placement cavity. With this design, the filter cotton is easy and convenient to install, and the product manufacturing efficiency is high.

[0017] Furthermore, a detachable mesh plate is provided on one side of the housing opening. The detachable mesh plate is detachably installed inside the housing, and the filter cotton is confined between the detachable mesh plate and the air inlet mesh. With this arrangement, the filter cotton is fixed by the detachable mesh plate installed inside the housing, resulting in a good fixing effect.

[0018] Alternatively, the outer periphery of the filter cotton is fixed to the placement cavity by adhesive bonding; with this arrangement, the filter cotton is firmly connected in the filter housing and is not easily separated from the filter housing.

[0019] Furthermore, it also includes an oil guide hole located on the lower side of the filter housing, which connects to the mounting cavity; this design allows the oil that settles during the self-cleaning process of the filter cotton to be discharged through the oil guide hole, resulting in a better self-cleaning effect for the filter cotton.

[0020] Furthermore, the filter housing and the volute are detachably connected on the outside of the air inlet; this design makes it convenient for users to install and remove the filter cotton.

[0021] Furthermore, the filter housing and the volute are detachably connected to each other on the outside of the air inlet via a rotating connection structure; the rotating connection structure is a threaded connection structure; with this design, it is convenient for users to install and remove the filter.

[0022] Alternatively, the rotary connection structure includes at least two retainers located on the outer periphery of the filter housing and a retaining block located at the corresponding installation position of the volute. The retaining block includes an upper inlet portion and a lower retaining portion. The outer diameter of the retaining portion is smaller than the outer diameter of the inlet portion. The retainer is provided with a retaining hole, which includes an inlet and a locking port that communicate with each other. The shape of the inlet is adapted to the inlet portion, and the inner diameter of the locking port is adapted to the outer diameter of the retaining portion. The inlet portion enters from the inlet portion and rotates circumferentially to engage the retaining portion with the locking port to connect the filter cotton to the volute. The filter cotton is rotated in the opposite direction to move the retaining portion to the inlet portion to disassemble the filter cotton from the volute.

[0023] Furthermore, the oil collection tank is equipped with chemical decomposition and purification materials, microbial decomposition and purification materials, or oil-absorbing materials for breaking down oil stains. Alternatively, the oil stains entering the oil collection tank are either naturally dried or disposed of. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the fan system in Example 1.

[0025] Figure 2 Explosion of the fan system in Example 1 Figure 1 .

[0026] Figure 3 Explosion of the fan system in Example 1 Figure 2 .

[0027] Figure 4 A schematic diagram of a filter. Figure 5 This is a schematic diagram of a folded filter cotton.

[0028] Figure 6 This is a schematic diagram of filter cotton that includes a gap layer, a cotton layer, and a fiber shaping thin layer.

[0029] Figure 7 Schematic diagrams of range hoods with self-cleaning oil fume filters in Examples 1 and 2. Figure 1 .

[0030] Figure 8 These are schematic diagrams of the range hoods with self-cleaning oil fume filters in Examples 1 and 2. Figure 2 .

[0031] Example 1: Reference numerals in the attached drawing of a range hood with a self-cleaning oil fume filter: Range hood housing 1, fan system 6, motor 62, air inlet of volute 64, air outlet of volute 65, volute 61, air inlet of range hood housing 3, air outlet of range hood housing 30, filter 63, filter housing 66, filter cotton 67, cotton layer 691, low melting point fiber 671, range hood air duct 51, gap layer 693, fiber shaping thin layer 692, mounting cavity 661, air inlet mesh 662, air inlet grille 663, card seat 681, card block 682, guide part 683, card connection part 684, card inlet 685, locking port 686, disassembly and assembly mesh plate 677, oil guide hole 660.

[0032] Example 2: Reference numerals in the attached drawing for a range hood with a self-cleaning oil fume filter. Range hood housing 1, fan system 6, motor 62, air inlet of volute 64, air outlet of volute 65, volute 61, filter cotton 67, oil collection tank 14, cotton layer 691, low melting point fiber 671, range hood duct 51, range hood air inlet 3, range hood air outlet 30, gap layer 693, fan 6. Detailed Implementation

[0033] The specific embodiments of this utility model are described below with reference to the accompanying drawings. In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model 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 this utility model.

[0034] Example 1: See Figures 1 to 8This utility model discloses a range hood with a self-cleaning oil fume filter, comprising a range hood housing 1, within which a fan system 6 is provided. The fan system 6 includes a motor 62, an impeller, and a volute 61. The impeller is disposed within the volute 61, and the motor 62 is driven by the impeller. The air inlet 64 and air outlet 65 of the volute 61 are respectively connected to the air inlet 3 and air outlet 30 of the range hood housing 1. A filter 63 is provided at the air inlet 64 and / or air outlet 65 of the volute 61. The filter 63 includes a filter housing 66 and filter cotton 67 disposed within the filter housing 66. The filter cotton 67 comprises multiple overlapping cotton layers 691, with the gap layer 693 between the cotton layers 691 set at an angle parallel to or less than 45° to the direction of gravity. Preferably, the gap layer 693 between the cotton layers 691 is set at an angle parallel to or less than 30° to the direction of gravity.

[0035] Compared with existing technologies, the range hood with a self-cleaning oil fume filter 63 of this utility model uses filter cotton 67 with a gap layer 693 to replace traditional activated carbon for filtering oil fume airflow. This not only solves the problem of "activated carbon easily becoming saturated due to oil retention after adsorption, resulting in oil fume penetration and frequent replacement", but also allows the oil adsorbed by the filter cotton 67 to be automatically discharged along the gap layer 693 by its own gravity, achieving the purpose of regeneration and extending the service life. It can also effectively prevent the problem of excessive oil accumulation and mold growth. In addition, the filter cotton 67 is a porous material with flexibility, so it will not vibrate due to the air intake of the range hood and will have a certain sound absorption effect. At the same time, the filter cotton 67 can also be made of high temperature resistant and flame retardant cotton material, which can effectively eliminate the risk of combustion. The filter cotton 67 achieves self-cleaning function while ensuring efficient oil fume filtration, and has the advantages of reliable function, safety and hygiene, and cost saving.

[0036] In one embodiment, the filter cotton 67 is made of high-temperature resistant and flame-retardant cotton material; this design can effectively eliminate the safety hazards caused by flammable materials and improve the safety of product use.

[0037] See Figure 6 and Figure 7 In one embodiment, it also includes an oil collection tank 14 for collecting oil stains, which is connected to the filter 63; in addition to having an oil absorption function, the filter cotton 67 is configured such that the oil in the filter cotton 67 is discharged into the oil collection tank 14 under the action of gravity, thereby achieving efficient oil fume filtration of the filter cotton 67 while realizing a self-cleaning function.

[0038] In one embodiment (not shown), the cotton layer 691 includes a plurality of first and second cotton layers stacked at intervals. The mass per unit volume of the second cotton layer is lighter than that of the first cotton layer. The second cotton layer is set to be parallel to the direction of gravity or at an angle of less than 45°. Preferably, the second cotton layer is set to be parallel to the direction of gravity or at an angle of less than 30°. With this arrangement, the cotton layers can both absorb oil and allow the absorbed oil to be automatically discharged between the cotton layers by gravity, thereby extending its service life and ensuring efficient oil fume filtration while achieving a self-cleaning function.

[0039] In one embodiment, the thickness of the second cotton layer is less than that of the first cotton layer; the average porosity of the second cotton layer is greater than that of the first cotton layer; this configuration allows the second cotton layer to have a better oil fume adsorption effect.

[0040] In one embodiment, the surfaces of each cotton layer 691 are bonded together by low-melting-point fibers 671, and the gap layer 693 is configured such that when the filter cotton 67 is pulled by a force along the arrangement direction of the cotton layers 691 and the gap layer 693, it only cracks along the gap layer 693; with this configuration, the cotton layers 691 are connected and formed by the low-melting-point fibers 671, and the overall structure of the filter cotton 67 has a good shaping effect.

[0041] In one embodiment, the gap layer 693 between the cotton layers 691 is set at an angle parallel to or less than 45° to the ventilation direction. Preferably, the gap layer 693 between the cotton layers 691 is set at an angle parallel to or less than 30° to the ventilation direction. In one embodiment, the cotton layer 691 is integrally formed with at least one end of its adjacent cotton layer 691, and the integrally formed end is not located on the lower side when the filter cotton 67 is installed; all cotton layers 691 are configured to be integrally formed with adjacent cotton layers 691.

[0042] See Figure 5 In one embodiment, a fiber-shaping thin layer 692, which is made of low-melting-point fibers bonded together, is also provided on one side of the filter cotton. The fiber-shaping thin layer 692 is not located on the underside of the filter cotton when it is installed.

[0043] In one embodiment, the filter cotton 67 contains a mixture of water-repellent fibers; or, the filter cotton 67 contains a mixture of water-repellent fibers and flame-retardant fibers.

[0044] See Figures 1 to 5In one embodiment, the filter housing 66 is provided with an inner opening cavity 661, the filter cotton 67 is placed in the cavity 661, the outer side of the filter housing 66 is provided with an air inlet mesh 662, the cavity 661 is rectangular or circular, and the shape of the filter cotton 67 corresponds to the shape of the cavity 661; with this arrangement, the filter cotton 67 is easy and convenient to install, and the product manufacturing efficiency is high.

[0045] See Figure 4 In one embodiment, a detachable mesh plate 677 is installed on one side of the opening of the mounting cavity 661. The detachable mesh plate is detachably installed in the mounting cavity 661 by means of a screw clip structure or an interference fit. The filter cotton 67 is confined between the detachable mesh plate 677 and the air inlet mesh 662. With this arrangement, the filter cotton 67 is fixed by the detachable mesh plate 677 in the mounting cavity 661, and the fixing effect is good.

[0046] See Figure 4 In one embodiment, an oil guide hole 660 is provided on the lower side of the filter housing 66, and the oil guide hole 660 is connected to the mounting cavity 661; with this arrangement, the oil that has settled in the filter cotton 67 can be discharged from the oil guide hole 660, and the self-cleaning effect of the filter cotton 67 is better.

[0047] Or see Figures 1 to 3 In one embodiment, the outer periphery of the filter cotton 67 is fixed to the placement cavity 661 by adhesive bonding; with this arrangement, the filter cotton 67 is firmly connected in the filter housing 66 and is not easily separated from the filter housing 66. Figures 1 to 3 Separation occurs.

[0048] See Figures 1 to 4 In one embodiment, the outer side of the filter housing 66 is an air intake grille 663, and the air intake mesh 662 is formed in the air intake grille 663. With this arrangement, the air intake grille 663 on the outer side of the filter housing 66 ensures air intake while fixing the filter cotton 67 and preventing the filter cotton 67 from falling off the filter housing 66.

[0049] See Figures 1 to 4 In one embodiment, the filter housing 66 and the volute housing 61 are detachably connected to each other on the outside of the air inlet 64; with this arrangement, the filter cotton 63 is easy to install and remove, making it convenient for users.

[0050] In one embodiment, the filter housing 66 and the volute housing 61 are located outside the air inlet 64 and are detachably connected by a rotating connection structure; the rotating connection structure is a threaded connection structure (not shown in the figure); with this setting, it is convenient for users to install and remove the filter cotton 63.

[0051] See Figures 1 to 4 In this embodiment, the rotary connection structure includes at least two retaining seats 681 disposed on the outer periphery of the filter housing 66 and retaining blocks 682 disposed on the outer periphery of the volute 61 body at the air inlet 64, corresponding to the retaining seats 681. Each retaining block 682 includes an upper inlet portion 683 and a lower retaining portion 684. The outer diameter of the retaining portion 684 is smaller than the outer diameter of the inlet portion. The retaining seats 681 are provided with retaining holes, which include interconnected insertion holes. The filter element 683 has an inlet 685 and a locking inlet 686. The shape of the inlet 685 is adapted to the guide portion 683, and the inner diameter of the locking inlet 686 is adapted to the outer diameter of the locking portion 684. The guide portion 683 enters from the inlet 685 and rotates circumferentially to make the locking portion 684 cooperate with the locking inlet 686 to connect the filter element 63 to the volute 61. The filter element 63 is rotated in the opposite direction to move the locking portion 684 to the inlet 685 to disassemble the filter element 63 from the volute 61.

[0052] Example 2 See Figure 6 and Figure 7 The main difference between this embodiment and Embodiment 1 is that the range hood with a self-cleaning oil fume filter includes a range hood housing 1, within which a range hood duct 51 and a fan 6 are provided. The fan 6 is the fan system 6 of Embodiment 1. The range hood housing 1 also has a range hood inlet 3 and a range hood outlet 30 communicating with the range hood duct 51. A filter (not shown) is provided in the range hood inlet 3, the range hood outlet 30, or the range hood duct 51. The filter includes a filter housing and filter cotton 67 disposed within the filter housing 66. The filter cotton 67 includes multiple overlapping cotton layers 691 with gap layers 693 set at an angle parallel to or less than 45° to the direction of gravity. Preferably, the filter cotton 67 includes multiple overlapping cotton layers 691 with gap layers 693 set at an angle parallel to or less than 30° to the direction of gravity.

[0053] Compared with existing technologies, the range hood with a self-cleaning oil fume filter 63 of this utility model uses filter cotton 67 with a gap layer 693 to replace traditional activated carbon for filtering oil fume airflow. This not only solves the problem of "activated carbon easily becoming saturated due to oil retention after adsorption, resulting in oil fume penetration and frequent replacement", but also allows the oil adsorbed by the filter cotton 67 to be automatically discharged along the gap layer 693 by its own gravity, achieving the purpose of regeneration and extending the service life. It can also effectively prevent the problem of excessive oil accumulation and mold growth. In addition, the filter cotton 67 is a porous material with flexibility, so it will not vibrate due to the air intake of the range hood and will have a certain sound absorption effect. At the same time, the filter cotton 67 can also be made of high temperature resistant and flame retardant cotton material, which can effectively eliminate the risk of combustion. The filter cotton 67 achieves self-cleaning function while ensuring efficient oil fume filtration, and has the advantages of reliable function, safety and hygiene, and cost saving.

[0054] In the above embodiments, the filter cotton and fiber shaping thin layer can be made of existing conventional chemical fiber materials, such as flame-retardant fibers, low-melting-point fibers, water-repellent fibers, etc. This utility model does not involve the improvement of materials, but uses existing materials.

[0055] In one embodiment, the oil collection tank 14 is equipped with chemical decomposition and purification materials, microbial decomposition and purification materials, or oil-absorbing materials for decomposing oil stains. Alternatively, the oil stains entering the oil collection tank 14 are either naturally dried or disposed of.

[0056] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A range hood with a self-cleaning oil fume filter, comprising a range hood housing, a fan system disposed within the range hood housing, the fan system comprising a motor, an impeller, and a volute, the impeller being disposed within the volute housing, the motor being driven by the impeller, and the air inlet and outlet of the volute housing being connected to the air inlet and air outlet of the range hood housing, respectively; characterized in that, A filter is provided at the air inlet and / or air outlet of the volute, the filter comprising a filter housing and filter cotton disposed within the filter housing; The filter cotton comprises multiple layers stacked on top of each other, with the gap between the layers set at an angle parallel to or less than 45° to the direction of gravity.

2. A range hood with a self-cleaning oil fume filter, comprising a range hood housing, an air duct and a fan inside the housing, and an air inlet and an air outlet communicating with the air duct; characterized in that, A filter is provided in the air inlet, air outlet, or air duct of the range hood. The filter includes a filter housing and filter cotton disposed inside the filter housing. The filter cotton comprises multiple layers stacked on top of each other, with the gap between the layers set at an angle parallel to or less than 45° to the direction of gravity.

3. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, It also includes an oil collection tank for collecting oil sludge, which is connected to the filter.

4. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The cotton layer includes multiple first cotton layers and second cotton layers stacked at intervals. The second cotton layer has a lighter mass per unit volume than the first cotton layer. The second cotton layer is set to be parallel to the direction of gravity or at an angle of less than 45°.

5. The range hood with a self-cleaning oil fume filter according to claim 4, characterized in that, The thickness of the second cotton layer is less than that of the first cotton layer; The average porosity of the second cotton layer is greater than that of the first cotton layer.

6. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The surfaces of each cotton layer are bonded together by low-melting-point fibers.

7. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The gap between each layer of cotton is set at an angle parallel to the ventilation direction or less than 45°.

8. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The cotton layer is integrally formed with at least one end of its adjacent cotton layer, and the integrally formed end is not located on the lower side when the filter cotton is installed; all cotton layers are configured to be integrally formed with adjacent cotton layers.

9. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, A fiber-shaping thin layer bonded with low-melting-point fibers is also provided on one side of the filter cotton. The fiber-shaping thin layer is not located on the underside of the filter cotton when it is installed.

10. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The filter cotton contains water-repellent fibers mixed and intertwined; or, the filter cotton contains water-repellent fibers and flame-retardant fibers mixed and intertwined.

11. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The filter housing has a placement cavity with an opening on one side, and the filter cotton is placed in the placement cavity. The other side of the filter housing has an air inlet mesh.

12. The range hood with a self-cleaning oil fume filter according to claim 11, characterized in that, The detachable mesh plate is installed on one side of the opening of the placement cavity. The detachable mesh plate can be detachably installed inside the placement cavity, and the filter cotton is confined between the detachable mesh plate and the air inlet mesh.

13. The range hood with a self-cleaning oil fume filter according to claim 11, characterized in that, It also includes an oil guide hole located on the lower side of the filter housing, which connects to the mounting cavity.

14. The range hood with a self-cleaning oil fume filter according to claim 1 or 2, characterized in that, The filter housing and the volute are detachably connected on the outside of the air inlet.

15. The range hood with a self-cleaning oil fume filter according to claim 14, characterized in that, The filter housing and the volute are located on the outside of the air inlet and can be detachably connected by a rotating connection structure. The rotary connection structure is a threaded connection structure; Alternatively, the rotary connection structure includes a retainer on the outer periphery of the filter housing and a retaining block at the corresponding installation position on the volute. The retaining block includes an upper inlet portion and a lower retaining portion. The outer diameter of the retaining portion is smaller than the outer diameter of the inlet portion. The retainer is provided with a retaining hole. The retaining hole includes an inlet and a locking port that are interconnected. The shape of the inlet is adapted to the inlet portion, and the inner diameter of the locking port is adapted to the outer diameter of the retaining portion.

16. The range hood with a self-cleaning oil fume filter according to claim 3, characterized in that, The oil collection tank is equipped with chemical decomposition and purification materials, microbial decomposition and purification materials, or oil-absorbing materials for decomposing oil stains.

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