Oil screen device and range hood

Abstract

The oil screen device comprises a first oil screen and a second oil screen which are sequentially arranged in the airflow direction of an air inlet, and further comprises an elastic reset module arranged on the second oil screen, and the elastic reset module comprises a fixed seat fixed relative to the second oil screen, a first oil screen and a second oil screen, the sliding part is arranged on the fixed seat, a guide limiting structure capable of enabling the sliding part to linearly slide in the direction parallel to the first direction is arranged between the sliding part and the fixed seat, and the sliding part is further provided with a connecting part used for being connected with a first oil screen; and the elastic piece is arranged between the sliding piece and the fixed seat and enables the sliding piece to always have a trend of moving relative to the fixed seat along the first direction. The elastic reset module integrates guiding and reset functions, and through buckle connection, a splayed tension spring and a limiting groove structure, it is ensured that the second oil screen does not deviate in linear motion. The symmetrically arranged tension springs counteract lateral force, and clamping is avoided.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to an oil filter device and a range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. Range hoods typically include top-mounted and side-mounted types. Side-mounted range hoods utilize the principle of vortex air pressure to absorb most of the fumes close to the stove in an arc, reducing adverse health effects. Furthermore, since the power source is closer to the stove, the suction efficiency is not significantly reduced. The grease filter is a crucial component of the range hood, used to filter grease. Traditional range hoods often have fixed, integrated grease filters. When cooking on one side, the range hood's airflow cannot effectively extract fumes, leading to smoke escaping easily at low settings and excessive noise at high settings, failing to achieve efficient and quiet suction.

[0003] To rationally allocate the air intake volume of a range hood and effectively utilize its airflow for fume extraction, Chinese utility model patent application CN202120687387.8 (authorization announcement number CN215570676U) discloses an air intake component and a range hood using the same component. The air intake component includes a panel with a first oil filter at the air inlet. Two first oil filters are present, with one end of each filter close to the other and the other end far apart. The component also includes a second oil filter, with each first oil filter corresponding to one second oil filter. The second oil filters can move away from or towards the other second oil filter. Each second oil filter can be in a first position and a second position. In the first position, the second oil filter cooperates with the first oil filter to fully open the air inlet. In the second position, the second oil filter cooperates with the first oil filter to partially open the air inlet. The position of the oil mesh is adjusted and reset via spring assemblies. The body of each spring assembly is fixed to the side of the first oil mesh facing inwards from the housing, and the pressure head of each spring assembly abuts against the opposite ends of the two second oil meshes. When the transmission rod drives the cam to rotate in a certain direction, the corresponding second oil mesh slides towards the corresponding elastic element, causing the elastic element to be compressed. When the transmission rod rotates in the opposite direction, the force of the cam on the stop on the second oil mesh disappears, and the second oil mesh slides back to its original position under the restoring force of the elastic element. A limiting guide rail is provided on the flange of the first oil mesh, and inserts that slide and engage with the limiting guide rail are formed at the upper and lower ends of the second oil mesh. The limiting guide rail serves to guide and limit the sliding of the second oil mesh. A limiting guide groove extending left and right is formed on the limiting guide rail, penetrating the end of the limiting guide rail of the corresponding first oil mesh away from the other first oil mesh; the penetrating end constitutes the entrance of the limiting guide groove.

[0004] However, the air intake assembly in the aforementioned patent application has certain shortcomings. First, the spring assembly for resetting the second oil screen and the guiding rail for guidance are relatively dispersed and installed in different areas of the oil screen. This makes the disassembly and assembly of the oil screen device cumbersome. Furthermore, the dispersed arrangement of the spring assembly and guiding rail in multiple areas of the oil screen creates several cleaning dead zones, increasing the difficulty of cleaning. Second, the spring assembly for resetting the second oil screen is mainly fixed to the side of the first oil screen facing the inside of the housing. This inevitably compresses the area of ​​the back of the first oil screen. Combined with the limited space occupied by the spring assembly's reset stroke, the area on the first oil screen suitable for opening ventilation holes is relatively smaller, resulting in a waste of some area of ​​the first oil screen.

[0005] Therefore, existing range hoods still need further improvement. Utility Model Content

[0006] The first technical problem to be solved by this utility model is to provide an oil mesh device in view of the current situation of the prior art. The oil mesh device is provided with a unit module that has both guiding and resetting functions, which simplifies the assembly process of the oil mesh device and reduces the difficulty of cleaning.

[0007] The second technical problem to be solved by this utility model is to provide an oil mesh device in view of the current situation of the prior art. The oil mesh device is provided with a unit module that has both guiding and resetting functions, and can effectively avoid encroaching on the effective ventilation area of ​​the oil mesh.

[0008] The third technical problem to be solved by this utility model is to provide a range hood that uses the above-mentioned oil mesh device, in view of the current state of the prior art.

[0009] The technical solution adopted by this utility model to solve the first technical problem is as follows: an oil mesh device, including a first oil mesh and a second oil mesh arranged sequentially along the airflow direction at the air inlet of a range hood. The first oil mesh is provided with a first air inlet hole, and the second oil mesh is provided with a second air inlet hole. The second oil mesh is driven by a driving mechanism and can move linearly relative to the first oil mesh along a first direction, thereby changing the relative position of the second air inlet hole on the second oil mesh and the first air inlet hole on the first oil mesh.

[0010] It also includes a resilient reset module disposed on the second oil network, the resilient reset module comprising:

[0011] The fixing seat is fixed relative to the second oil mesh;

[0012] A sliding member is disposed on the fixed base. A guide limiting structure is provided between the sliding member and the fixed base to allow the sliding member to slide linearly in a direction parallel to the first direction. The sliding member also has a connecting part for connecting with the first oil mesh.

[0013] An elastic element is disposed between the sliding element and the fixed base, and the sliding element always has a tendency to move relative to the fixed base along the first direction.

[0014] The technical solution adopted by this utility model to solve the second technical problem is as follows: Both the first oil mesh and the second oil mesh have a first side and a second side opposite to each other in the direction of movement of the second oil mesh. The elastic reset module is disposed on the back of the second oil mesh and adjacent to the first side or the second side of the second oil mesh. The first side or the second side of the first oil mesh has a first flange folded towards the side where the second oil mesh is located. The connecting part of the sliding member is connected to the first flange. By disposing the elastic reset module on the back of the side of the second oil mesh and cooperating with the flange of the first oil mesh, the spatial layout is optimized, so that the first oil mesh and the second oil mesh can be arranged to overlap as much as possible, ensuring that there is enough area on the first oil mesh as an effective ventilation area. On the other hand, the elastic reset module being disposed on the back of the second oil mesh also allows the first oil mesh and the second oil mesh to be as close together as possible, ensuring uniform transmission of the reset force and avoiding motion interference problems.

[0015] To achieve a detachable connection between the first flange of the first oil mesh and the sliding member, the first flange has a snap-fit ​​engagement portion. The connecting portion on the sliding member is a snap-fit ​​element that can be detachably snapped into the snap-fit ​​engagement portion. When the snap-fit ​​element is engaged in the snap-fit ​​engagement portion, both are limited in the moving direction of the second oil mesh. The limiting cooperation between the snap-fit ​​engagement portion and the snap-fit ​​element ensures a secure connection, prevents the sliding member from disengaging during resetting, and improves reliability. "The snap-fit ​​element and the snap-fit ​​engagement portion limit the moving direction of the second oil mesh" can be understood as follows: after the first flange (first oil mesh) and the sliding member are connected via the aforementioned snap-fit ​​element and snap-fit ​​engagement portion, they remain fixed at least in the moving direction of the second oil mesh and cannot move relative to each other. The snap-fit ​​element can be a conventional insert or a protruding post structure with a snap-fit ​​groove, and the snap-fit ​​engagement portion can correspond to an insertion hole for inserting the insert or a limiting groove structure for the protruding post to be engaged.

[0016] The guide and limiting structure between the sliding member and the fixed seat can adopt a rib-groove sliding fit structure or a column-hole fit structure (such as a guide post or guide sleeve). To simplify the guide and limiting structure, one of the sliding member and the fixed seat is provided with a limiting groove, and the other with a limiting rib. The extending direction of the limiting groove is parallel to the moving direction of the second oil mesh. The limiting rib slides and limits the movement within the limiting groove, thus forming the guide and limiting structure. The combination of the limiting groove and the limiting rib strictly constrains the linear movement of the sliding member along the first direction, preventing deviation and improving reset accuracy and durability.

[0017] As an improvement, the fixing base is a housing, which includes a first wall plate for connecting to the second oil mesh and a second wall plate located away from the second oil mesh. The extending direction of the second wall plate is parallel to the extending direction of the second oil mesh. The sliding member includes a mounting plate and a clamping plate arranged side by side. The end of the mounting plate is connected to the end of the clamping plate, making the sliding member generally U-shaped. The mounting plate is slidably disposed within the housing, and the clamping plate is located outside the second wall plate, and is limited in engagement with the second wall plate through the limiting groove and limiting rib. The U-shaped sliding member and housing design simplifies the assembly process, reduces maintenance difficulty, and enhances the stability of the overall structure.

[0018] Considering that a single elastic element can easily lead to uneven force on the sliding element, affecting the reset balance, as an improvement, there are two elastic elements located inside the housing and symmetrically arranged on both sides of the mounting plate of the sliding element. Symmetrical arrangement of elastic elements on both sides applies a balanced reset force, prevents the sliding element from tilting, and extends its service life.

[0019] The aforementioned elastic element can employ various existing technologies, including compression springs, torsion springs, leaf springs, and other elastic components. However, to better cooperate with the aforementioned sliding element and fixed base, the elastic element is a tension spring. The sliding element also includes connecting branches extending to the left and right sides respectively from the position where the end of the mounting plate connects to the end of the clamping plate. Each of the two connecting branches is provided with a first hanging part. The housing is also provided with a second hanging part in the area located on the left and right sides of the mounting plate. The two ends of the two tension springs are respectively connected to the corresponding first and second hanging parts.

[0020] The aforementioned "first holding part" connected to the "second holding part" can adopt a hole, hook, or column structure that can fix the end of the tension spring and withstand tension. For example, a simple through hole or blind hole can be used, allowing the hook of the tension spring to pass through directly; or it can be designed as a U-shaped or L-shaped hook, which makes installation and disassembly convenient.

[0021] Further improvements include an arrangement where the distance between the two tension springs gradually increases along the first direction, forming a figure-eight shape. This figure-eight spring layout disperses the force and fixes the spring positions, preventing them from falling off and ensuring stable output of elastic force. The figure-eight spring design aligns the resultant force direction with the first direction, eliminating lateral force components and improving reset efficiency.

[0022] To adjust the airflow on both sides of the air inlet to accommodate different cooking conditions, the first oil mesh has a first air inlet area and a second air inlet area, each with a first air inlet hole, arranged sequentially along the moving direction of the second oil mesh. There are two second oil meshes, also arranged sequentially along the moving direction. One second oil mesh faces the first air inlet area of ​​the first oil mesh, and the other faces the second air inlet area of ​​the first oil mesh. Elastic reset components on the two second oil meshes are correspondingly arranged on two sides of the two second oil meshes that are close to or far from each other. Generally, the two air inlet areas on the first oil mesh can be two areas on a single integrated oil mesh, or they can be air inlet areas corresponding to two independent sub-oil meshes. Preferably, the first oil mesh includes two sub-oil meshes arranged sequentially along the moving direction of the second oil mesh, with each sub-oil mesh corresponding to the first air inlet area and the second air inlet area of ​​the first oil mesh, respectively.

[0023] To address the issue of excessively tight or loose adhesion between the oil meshes, which could affect smooth movement or sealing, multiple support members are provided on the first or second oil mesh to separate the front side of the second oil mesh from the back side of the first oil mesh. The first and second oil meshes are also magnetically attached together. The support members maintain the distance between the two oil meshes, reducing friction area and ensuring flexible relative movement. Magnetic attachment ensures stable adhesion and facilitates user disassembly and installation. The combined use of support members and magnetic attachment balances mobility, secure adhesion, and ease of assembly and disassembly.

[0024] To further mitigate the swaying or deviation issues during the movement of the second oil mesh, the first oil mesh has two sides parallel to its moving direction with a second flange folded towards the back. The ends of these two second flanges each have a limiting stop edge bent towards the central region of the first oil mesh. Each limiting stop edge defines a limiting groove between itself, the corresponding second flange, and the main body of the first oil mesh. The two sides of the second oil mesh parallel to its moving direction are correspondingly limited within these two limiting grooves. The limiting grooves and limiting stops cooperate to constrain the movement trajectory of the second oil mesh, preventing derailment and ensuring smooth movement.

[0025] Considering that the limiting edge may obstruct the installation or removal of the second oil mesh, the side of the second oil mesh opposite to one of the limiting edges has an installation notch recessed toward the central area of ​​the second oil mesh to allow the corresponding limiting edge to pass through. The installation notch design facilitates the passage of the limiting edge, simplifies the assembly process, and maintains the limiting function.

[0026] The technical solution adopted by this utility model to solve the third technical problem is: a range hood, including a housing, an air inlet on the housing, and an oil screen at the air inlet, characterized in that: the oil screen adopts the oil screen device described above.

[0027] Compared with the prior art, the advantages of this utility model are as follows: The elastic reset module set on the second oil mesh has a connecting part of its sliding member used to connect with the first oil mesh, while the fixed seat is fixed relative to the second oil mesh. A guide limiting structure is also configured between the sliding member and the fixed seat to allow the sliding member to slide linearly in a direction parallel to the first direction. That is, the elastic reset module used for resetting the second oil mesh also has a guiding function, which ensures the stability of the reciprocating movement of the second oil mesh (including the process of movement driven by the driving mechanism and the reset process). This integrated modular unit structure design avoids some problems caused by the relatively dispersed installation of the reset module and guide module in different areas of the oil mesh in the prior art. Only the modular elastic reset module needs to be installed on the second oil mesh, which simplifies the assembly process of the oil mesh device and reduces the cleaning difficulty. Attached Figure Description

[0028] Figure 1 This is a three-dimensional structural diagram of the oil mesh device of Embodiment 1 of this utility model from a frontal angle;

[0029] Figure 2 This is a three-dimensional structural diagram of the oil mesh device of Embodiment 1 of this utility model from the rear angle;

[0030] Figure 3 This is a cross-sectional perspective view of the oil mesh device of Embodiment 1 of this utility model, cut along the moving direction of the second oil mesh.

[0031] Figure 4 This is a three-dimensional structural diagram of the oil mesh unit on the right side of the oil mesh device in Embodiment 1 of this utility model. The second oil mesh is in an inclined angle state during the installation process.

[0032] Figure 5 This is a three-dimensional structural diagram of the elastic reset module of Embodiment 1 of this utility model, with the tension spring in a contracted state;

[0033] Figure 6 This is an exploded view of the elastic reset module of Embodiment 1 of this utility model;

[0034] Figure 7 This is a three-dimensional structural diagram of the sliding component of the elastic reset module in Embodiment 1 of this utility model;

[0035] Figure 8 This is a three-dimensional structural diagram of the elastic reset module of Embodiment 1 of this utility model, with the tension spring in a stretched state;

[0036] Figure 9 This is a sectional perspective view of the oil mesh device of Embodiment 1 of this utility model, cut along the direction perpendicular to the movement of the second oil mesh.

[0037] Figure 10 This is a three-dimensional structural diagram of a portion of the oil mesh device according to Embodiment 2 of this utility model;

[0038] Figure 11 This is a three-dimensional structural diagram of Embodiment 2 of the present invention. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0040] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0041] Example 1

[0042] Figures 1-9 This illustration shows a preferred embodiment of the oil filter device of this utility model and a range hood using the oil filter device. The range hood includes a housing and a centrifugal fan disposed within the housing. The housing generally includes a fan frame and a smoke collection hood disposed at the bottom of the fan frame, with the inner cavity of the fan frame communicating with the inner cavity of the smoke collection hood. An air inlet is provided on the front side wall of the smoke collection hood, through which external smoke can enter the smoke collection hood. The centrifugal fan is disposed within the fan frame; when the centrifugal fan operates, it generates negative pressure, drawing external oil fumes into the smoke collection hood through the air inlet. An oil filter device is also provided at the air inlet of the smoke collection hood for filtering oil fumes.

[0043] The three-dimensional structural diagrams of the oil mesh device in this embodiment from the front and back angles are shown below. Figure 1 and Figure 2 As shown. The oil mesh device includes a first oil mesh 21 and a second oil mesh 31 disposed on the back of the first oil mesh 21, which are arranged sequentially along the airflow direction at the air inlet. The first oil mesh 21 is provided with a first air inlet hole 210, and the second oil mesh 31 is provided with a second air inlet hole 310, wherein the air inlets of both are strip-shaped holes with the same extension direction.

[0044] The first oil mesh 21 has two air inlet zones arranged sequentially along the moving direction of the second oil mesh 31 (generally along the left-right direction), namely the first air inlet zone 211 and the second air inlet zone 212, each with a first air inlet hole 210. The second oil mesh 31 has two sections, also arranged in the same direction, one corresponding to the first air inlet zone 211 of the first oil mesh 21, and the other corresponding to the second air inlet zone 212. Specifically, the first oil mesh 21 is composed of two sub-oil meshes 21a arranged along the moving direction of the second oil mesh 31, forming the first air inlet zone 211 and the second air inlet zone 212, respectively. The second oil mesh 31 can be moved linearly relative to the first oil mesh 21 along the first direction A1 by a drive mechanism, causing the overlap area between the second air inlet hole 310 and the first air inlet hole 210 to change, thereby adjusting the air intake volume.

[0045] Each sub-oil mesh 21a of the first oil mesh 21, combined with its corresponding second oil mesh 31, constitutes an oil mesh unit. This embodiment employs two symmetrically arranged oil mesh units, joined together to form an integrated device. The second oil mesh 31 of the two oil mesh units can move independently to adapt to different cooking conditions on the left and right sides of the range hood. The drive mechanism is typically located in the junction area of ​​the two oil mesh units, and motion control can be achieved using existing technologies such as a drive motor and lever or cam transmission.

[0046] See Figure 4Taking a single oil mesh unit as an example, both the first oil mesh 21 and the second oil mesh 31 are square structures, with the second oil mesh 31 being slightly smaller than the first oil mesh 21. The first oil mesh 21 (i.e., sub-oil mesh 21a) has first flanges 221 on both sides of the first direction A1, folding towards the side where the second oil mesh 31 is located, with their extension direction perpendicular to the first direction A1. On both sides perpendicular to the first direction A1, second flanges 222 are provided, folding towards the side where the second oil mesh 31 is located, with their extension direction parallel to the first direction A1. The end edges of both second flanges 222 have limiting edges 223 that bend towards the central region of the first oil mesh 21. Each limiting edge 223 defines a limiting groove 220 between itself, the corresponding second flange 222, and the main body of the first oil mesh 21. The two sides of the second oil mesh 31, parallel to its moving direction, are correspondingly limited within the two limiting grooves 220. This structural design helps enhance the support and flow guidance functions of the oil mesh, while ensuring the stable movement of the second oil mesh 31 on the back. The outer periphery of the second oil mesh 31 also has a third flange 33 folded towards the back. The inner side of the second flange 222 of the first oil mesh 21 (that is, the side facing the third flange 33 of the second oil mesh 31) has a support protrusion (not shown) protruding towards the second oil mesh 31. The support protrusion has multiple protrusions arranged sequentially along the length direction of the second flange 222, and the surface is an arc-shaped curved surface structure. The outer side of the third flange 33 of the second oil mesh 31 contacts the support protrusion on the second flange 222 of the first oil mesh 21, reducing the frictional contact area between the two oil mesh flanges and ensuring the flexibility of the movement of the second oil mesh 31.

[0047] To facilitate the installation of the second oil mesh 31 on the back of the first oil mesh 21, at least one side of the second oil mesh 31 opposite to the limiting edge 223 has an installation notch 32 that is recessed toward the central region of the second oil mesh 31 so that the corresponding limiting edge 223 can pass through.

[0048] The second oil mesh 31 is also provided with a plurality of support members 34 for separating the front side of the second oil mesh 31 from the back side of the first oil mesh 21. The support members 34 can be integrally formed with the second oil mesh 31 by heat fusion. Figure 2 As shown, two rows of support members 34 are placed between the second oil mesh 31 and the first oil mesh 21, with four support members 34 in each row. The first oil mesh 21 and the second oil mesh 31 are also attracted together by magnetic members 35. Specifically, combined with... Figure 9 The row of oil mesh 31 on the side adjacent to its installation notch 32 (such as...) Figure 2Two additional magnets are provided in the upper support member 34 for adsorbing the first oil mesh 21. Magnets are also provided in the upper left and upper right support members 34 of the second oil mesh 31 to adsorb the upper end of the second oil mesh 31. The lower end of the second oil mesh 31 is limited by the limiting edge 223 of the first oil mesh 21, which solves the risk of falling off due to the lack of magnets at the lower end.

[0049] Both the first oil mesh 21 and the second oil mesh 31 have a first side and a second side opposite to each other in the moving direction of the second oil mesh 31. One of the two sides of the second oil mesh 31 in the moving direction can cooperate with the drive mechanism, and the other side is provided with an elastic reset module 4. The elastic reset module 4 cooperates with the first oil mesh 21 and acts on the second oil mesh 31, causing the second oil mesh 31 to move and reset along the second direction A2. The second direction A2 is opposite to the first direction A1. The elastic reset module 4 includes a fixed base 41, an elastic element 43, and a sliding element 42.

[0050] The fixing base 41 can be fixed to the back of the second oil mesh 31 by screws. The fixing base 41 is a cuboid shell, which includes a shell body 411 with an opening and a cover 412. The cover 412 is connected to the opening of the shell body 411 by a snap-fit ​​structure. The aforementioned elastic member 43 and sliding member 42 are both provided inside the shell. A clearance opening 410 is provided on the side wall of the shell facing the first flange 221 of the first oil mesh 21, through which the sliding member 42 can enter and exit the shell. The sliding member 42 has a U-shaped structure, including a mounting plate 421 and a clamping plate 422. The end of the mounting plate 421 is connected to the end of the clamping plate 422, and a corresponding snap-fit ​​member 425 is provided at the connection position as a connection part for connecting with the first oil mesh 21. The mounting plate 421 of the sliding member 42 is inserted into the shell of the fixing base 41, and the clamping plate 422 is located on the outside of the shell. The fixing base 41 has a first wall plate for abutting and connecting with the second oil mesh 31 and a second wall plate that is away from the second oil mesh 31. The first wall plate is the cover 412, and the second wall plate is a side wall plate on the shell body 411 opposite to the cover 412. A limiting groove 4110 is formed on the outer wall surface of the second wall plate of the fixing base 41, and the limiting groove 4110 extends along the moving direction of the second oil mesh 31. A limiting rib 4221 is provided on the inner side of the clamping plate 422. The limiting rib 4221 cooperates with the limiting groove 4110 to restrict the sliding member 42 to slide only in the left and right direction (that is, in the direction parallel to the first direction A1).

[0051] There are two elastic elements 43, which can be tension springs. The two tension springs are symmetrically arranged on both sides of the mounting plate 421. One end of the spring is hooked onto the first holding part 424 (a column structure) of the connecting support 423 of the sliding member 42, and the other end is hooked onto the second holding part 415 (a column structure) inside the housing of the fixed base 41. The two springs are arranged in a figure-eight shape, and the resultant force direction is consistent with the movement direction of the second oil mesh 31. There are two connecting supports 423 on the sliding member 42, both located at the junction of the mounting plate 421 and the clamping plate 422, and extending to the left and right sides respectively from the junction (the extension direction is basically perpendicular to the movement direction of the second oil mesh 31).

[0052] The connecting part on the sliding member 42 for connecting with the first oil mesh 21 is a snap-fit ​​member 425. The side of the first oil mesh 21 is provided with a first flange 221 that folds towards the second oil mesh 31. The first flange 221 has a snap-fit ​​engagement part 2211. Specifically, the snap-fit ​​member 425 of the sliding member 42 is a protruding post structure with a concave snap-fit ​​groove 22110. The snap-fit ​​engagement part 2211 on the first flange 221 is designed as a V-shaped limiting groove. During installation, the edge of the limiting groove of the first flange 221 can be snapped into the snap-fit ​​groove of the protruding post of the sliding member 42, thereby limiting the movement of the first flange 221 and the sliding member 42 in the direction of movement of the second oil mesh 31, so that the two remain fixed and cannot move relative to each other. When the drive mechanism pushes the second oil mesh 31 to move, the sliding member 42 slides with the second oil mesh 31, and the tension spring is stretched; after the drive mechanism stops, the restoring force of the tension spring resets the second oil mesh 31. In some embodiments, the portion of the first flange 221 where the snap-fit ​​engagement portion 2211 is located is recessed toward the center of the first oil mesh 21, thereby forming a receiving recess 2210 on the first flange 221. After the snap-fit ​​member 425 is installed in place, the end of the protruding post portion is correspondingly received in the receiving recess 2210, avoiding protrusion relative to the outer wall surface of the first flange 221.

[0053] Taking the right-side oil mesh unit as an example, the process of installing the second oil mesh 31 onto the first oil mesh 21 is as follows: First, insert the lower end of the second oil mesh 31 diagonally downward into the lower end of the first oil mesh 21, then abut the rightmost side of the second oil mesh 31 against the first flange 221 of the first oil mesh 21; flip the second oil mesh 31 downward, and the upper end of the second oil mesh 31 is attracted to the first oil mesh 21 by a magnet. During the flipping process of the second oil mesh 31, the snap fastener 425 of the elastic reset module 4 snaps into the snap fastener engagement 2211 of the first flange 221 of the first oil mesh 21, at which point the second oil mesh 31 and the first oil mesh 21 are fixedly installed. The method for removing the second oil mesh 31 from the first oil mesh 21 is the reverse of the above: the user grasps the upper end of the second oil mesh 31 and lifts it upwards, causing the magnet at the upper end of the second oil mesh 31 to separate from the first oil mesh 21; during the upward flipping of the second oil mesh 31, the latch 425 of the elastic reset module 4 disengages from the first flange 221 of the first oil mesh 21, causing the second oil mesh 31 to separate from the first oil mesh 21. Then, the second oil mesh 31 is taken out diagonally upwards, and the disassembly is completed.

[0054] In this embodiment, the elastic reset module 4 provided on the second oil mesh 31 has a connecting part of its sliding member 42 used to connect with the first oil mesh 21, while the fixed base 41 is fixed relative to the second oil mesh 31. A guide and limiting structure is also configured between the sliding member 42 and the fixed base 41, allowing the sliding member 42 to slide linearly in a direction parallel to the first direction A1. In other words, the elastic reset module 4, used for resetting the second oil mesh 31, also has a guiding function, ensuring the stability of the reciprocating movement of the second oil mesh 31 (including the process of movement driven by the driving mechanism and the reset process). This integrated modular unit structure design avoids some problems caused by the relatively dispersed installation of the reset module and guide module in different areas of the oil mesh in the prior art. Only the modular elastic reset module 4 needs to be installed on the second oil mesh 31, simplifying the assembly process of the oil mesh device and reducing cleaning difficulty. The elastic reset module 4 integrates guiding and reset functions, ensuring that the second oil mesh 31 moves linearly without deviation through a snap-fit ​​connection, a figure-eight spring, and a limiting groove 220 structure. Symmetrically arranged springs counteract lateral forces and prevent jamming. The magnetic attraction and support component 34 are designed to balance stability and ease of cleaning. Those skilled in the art can, based on the embodiments described, select different drive mechanisms (such as linear motors, manual levers) or elastic components 43 (such as torsion springs, leaf springs, compression springs) to achieve similar effects, all of which fall within the protection scope of this utility model.

[0055] Example 2

[0056] Figure 10 and Figure 11This illustration shows another preferred embodiment of the oil filter device and range hood of the present invention. The difference between this embodiment and Embodiment 1 lies only in the specific mating structure between the latching member 425 of the sliding member 42 and the latching engagement portion 2211 on the first flange 221 of the first oil filter 21. Specifically, the latching member 425 on the sliding member 42 is a pin, which is also located at the connection position between the mounting plate 421 and the clamping plate 422 of the sliding member 42, extending towards the side where the first oil filter 21 is located. The rear edge of the first flange 221 has a folded edge 22111 extending towards the central region of the first oil filter 21, and this folded edge 22111 has a through-hole 22112. During installation, the insert of the sliding member 42 can be inserted into the insertion hole 22112 on the folded edge 22111 of the first flange 221, thereby limiting the movement of the first flange 221 and the sliding member 42 in the moving direction of the second oil mesh 31, so that the two remain fixed and cannot move relative to each other.

[0057] Based on the above embodiments, other embodiments can be obtained by replacing and improving the relevant technical features. For example, the support member 34 and the magnet can also be set on the first oil mesh 21, and are not limited to being set on the second oil mesh 31. Furthermore, the limiting stop 223 on the first oil mesh 21 can be omitted, and multiple magnetic strips (such as neodymium iron boron magnets) can be embedded in the edges of the first oil mesh 21 and the second oil mesh 31 to make them adhere to each other. During disassembly, the user can separate the oil mesh with a little force, making it easy to clean.

Claims

1. An oil screen device, comprising a first oil screen (21) and a second oil screen (31) arranged in sequence along the airflow direction at the air inlet of an extractor hood, the first oil screen (21) being provided with first air inlet holes (210), the second oil screen (31) being provided with second air inlet holes (310), the second oil screen (31) being driven by a driving mechanism to move linearly relative to the first oil screen (21) in a first direction (A1) so as to change the relative position of the second air inlet holes (310) on the second oil screen (31) and the first air inlet holes (210) on the first oil screen (21); characterized in that further comprising an elastic reset module (4) provided on the second oil screen (31), the elastic reset module (4) comprising: a fixed seat (41) fixed relative to the second oil screen (31); a sliding member (42) provided on the fixed seat (41), the sliding member (42) and the fixed seat (41) being provided with a guide limiting structure allowing the sliding member (42) to slide linearly in a direction parallel to the first direction (A1), the sliding member (42) further having a connecting portion for connecting with the first oil screen (21); an elastic member (43) provided between the sliding member (42) and the fixed seat (41) and allowing the sliding member (42) to always have a tendency to move relative to the fixed seat (41) in the first direction (A1).

2. An oil screen device according to claim 1, characterized in that: The first oil screen (21) and the second oil screen (31) each have a first side and a second side opposite in the moving direction of the second oil screen (31), the elastic reset module (4) is provided on the back of the second oil screen (31) and adjacent to the first side or the second side of the second oil screen (31), the first oil screen (21) has a first flange (221) folded towards the side where the second oil screen (31) is located on the first side or the second side of the first oil screen (21), and the connecting portion of the sliding member (42) is connected with the first flange (221).

3. An oil screen apparatus according to claim 2, wherein: The first flange (221) has a buckle joint portion (2211), and the connecting portion of the sliding member (42) is a buckle member (425) detachably buckled into the buckle joint portion (2211), in the state that the buckle member (425) is buckled into the buckle joint portion (2211), the two are limited in the moving direction of the second oil screen (31).

4. An oil screen device according to any one of claims 1 to 3, characterized in that: One of the sliding member (42) and the fixed seat (41) is provided with a limiting sliding groove (4110), and the other is provided with a limiting convex rib (4221), the extending direction of the limiting sliding groove (4110) is parallel to the moving direction of the second oil screen (31), and the limiting convex rib (4221) is slidingly limited in the limiting sliding groove (4110), thereby forming the guide limiting structure.

5. An oil screen apparatus as defined in claim 4, wherein: The fixed seat (41) is a shell which comprises a first wall plate for connecting with the second oil screen (31) and a second wall plate which is opposite to the second oil screen (31) and extends in parallel with the second oil screen (31), the sliding member (42) comprises a mounting plate (421) and a clamping plate (422) which are arranged side by side, the end of the mounting plate (421) is connected with the end of the clamping plate (422), so that the sliding member (42) is in U shape as a whole, the mounting plate (421) is slidingly arranged in the shell, and the clamping plate (422) is located outside the second wall plate and is limited and matched with the second wall plate through the limiting sliding groove (4110) and the limiting convex rib (4221).

6. An oil screen apparatus according to claim 5, wherein: The elastic members (43) are two, which are arranged symmetrically on the two sides of the mounting plate (421) of the sliding member (42).

7. An oil screen apparatus according to claim 6, characterized in that: The elastic members (43) are tension springs, the sliding member (42) further comprises connecting branches (423) which extend to the left and right sides respectively from the positions where the ends of the mounting plate (421) are connected with the ends of the clamping plate (422), the first hanging parts (424) are arranged on the two connecting branches (423), and the second hanging parts (415) are further arranged in the regions on the left and right sides of the mounting plate (421) in the shell respectively, and the two ends of the two tension springs are connected with the corresponding first hanging parts (424) and second hanging parts (415) respectively.

8. An oil screen apparatus according to claim 7, characterized in that: The distance between the two tension springs gradually increases along the first direction (A1) and is arranged in a shape of eight characters.

9. An oil mesh device according to any one of claims 1 to 3, characterized in that: The first oil screen (21) has the first air inlet area (211) and the second air inlet area (212) which are arranged in sequence along the moving direction of the second oil screen (31) and are both distributed with the first air inlet hole (210), the second oil screen (31) is also arranged in sequence along the moving direction of the second oil screen (31) and has two, one of which is opposite to the first air inlet area (211) of the first oil screen (21), and the other is opposite to the second air inlet area (212) of the first oil screen (21), and the elastic reset assemblies on the two second oil screens (31) are arranged on the two side portions of the two second oil screens (31) which are close to or away from each other.

10. An oil mesh device according to any one of claims 1 to 3, characterized in that: The first oil screen (21) or the second oil screen (31) is further provided with a plurality of supporting members (34) for spacing the front side of the second oil screen (31) from the back of the first oil screen (21), and the first oil screen (21) and the second oil screen (31) are further adsorbed together through the magnetic member (35).

11. An oil mesh device according to any one of claims 1 to 3, characterized in that: Both sides of the first oil screen (21) parallel to the moving direction of the second oil screen (31) have a second flange (222) folded towards the back, and the end edges of both the second flanges (222) have a limiting flange (223) folded towards the middle area of the first oil screen (21), each limiting flange (223) and the corresponding second flange (222) and the main body of the first oil screen (21) define a limiting groove (220), and the two sides of the second oil screen (31) parallel to the moving direction thereof are correspondingly limited in the two limiting grooves (220).

12. An oil screen apparatus according to claim 11, characterized in that: The side of the second oil screen (31) opposite to the limiting flange (223) has a mounting gap (32) recessed towards the middle area of the second oil screen (31) for the corresponding limiting flange (223) to pass through.

13. A range hood comprising a housing, an air inlet being formed in the housing, and an oil screen being arranged at the air inlet, characterized in that: The oil screen adopts the oil screen device of any one of claims 1-12.

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