Exhaust filter screen structure

Abstract

The utility model discloses an exhaust filter screen structure which comprises a ventilation base plate, a first filter plate and a ventilation cover plate, a first cylinder part and a first positioning ring groove are formed on the ventilation base plate, first groove walls are arranged on the two radial sides of the first positioning ring groove respectively, and a first groove opening is formed in the first positioning ring groove. The first groove opening is formed between the two corresponding first groove walls, the first positioning ring grooves are formed in the inner side of the first cylinder part and are concentrically distributed at equal intervals, the first filtering disc comprises first activated carbon balls, and the first positioning ring grooves are correspondingly provided with the first activated carbon balls distributed in the circumferential direction; the first activated carbon balls are sunk into the corresponding first notches, a second barrel part and a grid are formed on the ventilation cover disc, the first activated carbon balls are arranged between the first groove walls and the grid, and the first barrel part is detachably connected with the second barrel part. The exhaust filter screen structure disclosed by the utility model is suitable for oil smoke emission application occasions.

Description

Technical Field

[0001] This utility model relates to the field of airflow filtration structures, specifically to an exhaust filter structure. Background Technology

[0002] Currently, range hoods exhaust cooking fumes outdoors through ducts. However, the exhaust airflow still contains a significant amount of smoke and grease, impacting the outdoor environment. If the exhaust vent faces a neighbor's window, the impact is even more severe. Existing exhaust filter structures use activated carbon filter cotton as the filter material. While this provides good filtration, it also significantly obstructs airflow, resulting in poor fume extraction. Furthermore, the activated carbon filter cotton is easily clogged with grease and requires frequent replacement. Therefore, the current exhaust filter structure is unsuitable for applications involving cooking fume emissions and needs improvement. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide an exhaust filter structure that is suitable for applications involving the emission of oil fumes.

[0004] The objective of this utility model is achieved through the following technical solution.

[0005] The exhaust filter structure disclosed in this utility model includes a ventilation chassis, a first filter disc, and a ventilation cover disc. The ventilation chassis forms a first cylindrical portion and a first positioning ring groove. The first positioning ring groove has first groove walls on both radial sides and a first groove opening between two corresponding first groove walls. The first positioning ring groove is located inside the first cylindrical portion and is concentrically distributed at equal intervals. The first filter disc includes first activated carbon balls. The first positioning ring groove is provided with circumferentially distributed first activated carbon balls, which are recessed into the corresponding first groove openings. The ventilation cover disc forms a second cylindrical portion and a grid. The first activated carbon balls are located between the first groove walls and the grid. The first cylindrical portion and the second cylindrical portion are detachably connected.

[0006] Preferably, one end of the first cylindrical portion has an outer step with a groove, and one end of the second cylindrical portion has an inner step with a hook. The outer step and the inner step are adapted to be inserted into each other, and the hook engages with the corresponding groove.

[0007] Preferably, the outer wall of the first cylindrical portion is aligned with the outer wall of the second cylindrical portion, a groove for inserting a screwdriver is formed on the first cylindrical portion, the groove communicates with the corresponding slot, and the groove is axially connected to the edge of the second cylindrical portion.

[0008] Preferably, the first groove has an inner chamfer.

[0009] Preferably, the exhaust filter structure of this utility model further includes a positioning plate and a second filter plate. The positioning plate and the second filter plate are disposed within the space enclosed by the ventilation base and the ventilation cover plate. The positioning plate is disposed between the second filter plate and the first filter plate. One side of the positioning plate is attached to the first filter plate, and a second positioning ring groove is formed on the corresponding other side of the positioning plate. Second groove walls are respectively provided on both radial sides of the second positioning ring groove. The second positioning ring groove has a second groove opening, which is located between two corresponding second groove walls. The second positioning ring grooves are concentrically distributed at equal intervals. The second filter plate includes a second activated carbon ball. The second positioning ring groove is respectively provided with circumferentially distributed second activated carbon balls. The second activated carbon balls are embedded in the corresponding second groove opening. The second filter plate is attached to the inner side of the grid.

[0010] Preferably, the second positioning ring groove is radially offset from the first positioning ring groove.

[0011] Compared with the prior art, the advantages of this utility model are as follows: by setting a ventilation chassis to form a first cylindrical part and a first positioning ring groove, the first positioning ring grooves are concentrically distributed at equal intervals, the first filter disc includes a first activated carbon ball, and the first positioning ring grooves are respectively provided with circumferentially distributed first activated carbon balls, the first activated carbon balls are embedded in the corresponding first groove openings, and the first cylindrical part and the second cylindrical part are detachably connected, so that the exhaust filter structure of this utility model has a weaker obstruction effect on the oil fume airflow, but still has a better filtration effect, thus making it suitable for oil fume emission applications. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the exhaust filter structure of this utility model.

[0013] Figure 2 This is an exploded view of the exhaust filter structure of this utility model.

[0014] Figure 3 This is a cross-sectional view of the exhaust filter structure of this utility model.

[0015] Figure 4 for Figure 3 A partial structural diagram.

[0016] Figure 5 This is a three-dimensional structural diagram of the combination of the ventilation chassis and the first filter disc of this utility model.

[0017] Figure 6 This is a three-dimensional structural diagram of the ventilation chassis of this utility model.

[0018] Figure 7 This is a cross-sectional structural diagram of the ventilation chassis of this utility model.

[0019] Figure 8 This is a three-dimensional structural diagram of the positioning disc of this utility model.

[0020] Figure 9 This is a three-dimensional structural diagram of the ventilation cover plate of this utility model.

[0021] Labeling: Ventilation chassis 1; First cylinder 11; Groove 111; Recess 1111; Outer step 112; First positioning ring groove 12; First groove wall 121; First groove opening 120; Inner chamfer 1201; Groove wall support 13; First filter disc 2; First activated carbon ball 200; Ventilation cover 3; Second cylinder 31; Hook 311; Inner step 312; Grid 313; Positioning disc 4; Groove wall support 41; Second positioning ring groove 42; Second groove wall 421; Second groove opening 420; Second filter disc 5; Second activated carbon ball 500. Detailed Implementation

[0022] The present invention will now be further described with reference to the accompanying drawings.

[0023] The exhaust filter structure of this utility model is as follows: Figures 1 to 4 As shown, it includes a ventilation chassis 1, a first filter plate 2, and a ventilation cover plate 3, as follows: Figure 6 and Figure 7 As shown, the ventilation chassis 1 has a first cylindrical portion 11 and a first positioning ring groove 12. First groove walls 121 are respectively provided on both radial sides of the first positioning ring groove 12, as shown... Figure 7 As shown, the first positioning annular groove 12 has a first slot 120, which is located between two corresponding first slot walls 121. Therefore, it can also be understood that the first positioning annular groove 12 is formed between two adjacent concentrically arranged first slot walls 121. The first positioning annular groove 12 is located on the inner side of the first cylindrical portion 11, as shown. Figure 6 and Figure 7 As shown, the first positioning ring grooves 12 are concentrically distributed at equal intervals; in other words, the spacing between the first positioning ring grooves 12 is equal in the radial direction. Figure 2 and Figure 5 As shown, the first filter plate 2 includes a first activated carbon ball 200, such as Figures 3 to 5As shown, the first positioning annular groove 12 is respectively provided with circumferentially distributed first activated carbon balls 200. In other words, as Figure 2 As shown, the first activated carbon balls 200 corresponding to each first positioning ring groove 12 constitute the disc-shaped structure of the first filter disc 2, as follows: Figure 4 As shown, the first activated carbon ball 200 is embedded in the corresponding first groove 120. That is, the first activated carbon ball 200 is partially disposed in the first positioning ring groove 12. The width of the first positioning ring groove 12 is smaller than the diameter of the first activated carbon ball 200, so that the first positioning ring groove 12 can position the first activated carbon ball 200 radially and axially (unidirectionally) along the first positioning ring groove 12. Figure 9 As shown, the ventilation cover 3 has a second cylindrical portion 31 and a grid 313, as Figure 4 As shown, the first activated carbon ball 200 is disposed between the first groove wall 121 and the grid 313. Specifically, the grid 313 includes concentric grid bars and radial grid bars, with each concentric grid bar and radial grid bar connected as a whole, and the radial grid bars connected as a whole with the second cylinder 31. The first cylinder 11 and the second cylinder 31 are detachably connected; for example, the first cylinder 11 and the second cylinder 31 can be glued together, and the first cylinder 11 and the second cylinder 31 can be separated by breaking the glue bond structure; for example, a screw can be used to pass through the first cylinder 11 in a direction parallel to the axis of the first cylinder 11 and screwed into the second cylinder 31, and the first cylinder 11 and the second cylinder 31 can be separated after removing the screw.

[0024] like Figure 4 As shown, the oil fume airflow can enter the exhaust filter structure of this invention through the grid 313. The oil fume airflow comes into contact with each of the first activated carbon balls 200 of the first filter disc 2, allowing a larger amount of oil and soot in the oil fume airflow to be adsorbed onto the first activated carbon balls 200. The oil fume airflow then leaves the exhaust filter structure of this invention through the gaps between the first groove walls 121. Figure 6 As shown, the ventilation chassis 1 has groove wall supports 13, which are integrally connected to the inner wall of the first cylindrical section 11. Each first groove wall 121 is integrally connected to the groove wall supports 13. The number of groove wall supports 13 is set to four, and the groove wall supports 13 are evenly distributed circumferentially around the axis of the first cylindrical section 11. The grid 313 and the concentrically distributed first positioning ring grooves 12 can be understood as a ventilation net structure. Figure 5As shown, since the first activated carbon ball 200 has a spherical structure, the oil fume airflow can flow along the spherical surface of the first activated carbon ball 200. That is to say, the spherical surface has a guiding effect on the airflow, and a small amount of airflow can pass directly between adjacent first activated carbon balls 200. Therefore, the oil fume airflow is less obstructed, reducing the impact of the exhaust filter structure on the oil fume extraction effect of the range hood and preventing oil fumes from spreading in the kitchen. Because the oil fume airflow can flow along the spherical surface of the first activated carbon ball 200, it is beneficial to relatively increase the effective contact area between the oil fume airflow and the first activated carbon ball 200. If cubic activated carbon particles are used, the side of the cube facing away from the airflow direction is not easy to effectively contact the airflow, and the obstruction effect of cubic activated carbon particles on the airflow is more obvious. Therefore, the adsorption effect of the first filter plate 2 on smoke and oil is also better. By setting the first positioning annular groove 12, the first activated carbon balls 200 can be arranged circumferentially and abutting each other in the first positioning annular groove 12. Moreover, the first positioning annular groove 12 is evenly spaced and concentrically distributed, which is conducive to the uniform distribution of the first activated carbon balls 200, avoids the formation of local high wind resistance areas in the first filter disc 2, and helps to improve the airflow effect. At the same time, it also avoids the formation of filtration voids in the first filter disc 2. The exhaust filter structure of this utility model can be set in the exhaust vent cap on the external wall (such as the "Exhaust Vent Cap of Range Hood" with utility model patent publication number CN2395195Y), or the exhaust filter structure of this utility model can be set at the exhaust end of the range hood. After a period of use, the ventilation base 1 and ventilation cover 3 can be disassembled. The first activated carbon ball 200 of the first filter plate 2 can be poured out. Then, the ventilation base 1 can be laid flat, and new first activated carbon balls 200 can be poured into the ventilation base 1. The ventilation base 1 can be shaken horizontally to allow the first activated carbon balls 200 to fall into (sink into) the first groove 120. The empty space of the first positioning ring groove 12 can be filled with the first activated carbon balls 200 by hand, and then the ventilation cover 3 can be closed. As can be seen from the above, the exhaust filter structure of this utility model has a weak obstruction effect on the airflow of oil fumes, but it also has a good filtration effect, thus making it suitable for oil fume emission applications.

[0025] Furthermore, such as Figure 6 As shown, an outer step 112 is formed at one end of the first cylindrical portion 11, and a groove 111 is formed on the outer step 112, such as... Figure 9 As shown, an inner step 312 is formed at one end of the second cylindrical portion 31, and a hook 311 is formed on the inner step 312. The outer step 112 is arranged around the axis of the first cylindrical portion 11, and the inner step 312 is arranged around the axis of the second cylindrical portion 31. Figure 4As shown, the outer step 112 and the inner step 312 are fitted and inserted, thus making the first cylindrical part 11 and the second cylindrical part 31 radially positioned relative to each other. The hook 311 engages with the corresponding groove 111. During the assembly of the ventilation chassis 1 and the ventilation cover plate 3, the ventilation cover plate 3 is placed on the ventilation chassis 1 along the axial direction, so that the outer step 112 and the inner step 312 are inserted into each other. The edge of the first cylindrical part 11 pushes open the part of the second cylindrical part 31 where the hook 311 is formed, so that the hook 311 can pass over the edge of the first cylindrical part 11 and reach the groove 111. Then the second cylindrical part 31 elastically returns to its original position, so that the hook 311 enters into the corresponding groove 111, thereby enabling the ventilation chassis 1 and the ventilation cover plate 3 to be quickly assembled.

[0026] Furthermore, such as Figure 4 As shown, the outer wall of the first cylindrical portion 11 is aligned with the outer wall of the second cylindrical portion 31, meaning that the outer diameter of the first cylindrical portion 11 is equal to the outer diameter of the second cylindrical portion 31, and the first cylindrical portion 11 and the second cylindrical portion 31 are coaxially arranged. Figure 4 and Figure 6 As shown, a groove 1111 for inserting a screwdriver is formed on the first cylindrical part 11. The groove 1111 is connected to the corresponding snap-fit ​​groove 111. The groove 1111 is axially connected to the edge of the second cylindrical part 31 (i.e., in the direction parallel to the axis of the first cylindrical part 11). Thus, a flathead screwdriver can be inserted obliquely into the groove 1111 to pry the edge of the second cylindrical part 31, causing the corresponding snap hook 311 of the second cylindrical part 31 to move radially outward slightly. This causes the snap hook 311 to leave the corresponding snap-fit ​​groove 111. Then, the ventilation cover 3 is pulled axially away from the ventilation base 1 by hand, which makes it easy to separate the ventilation cover 3 from the ventilation base 1 and replace the first filter disc 2.

[0027] Furthermore, such as Figure 4 As shown, the first slot 120 has an inner chamfer 1201. In other words, the inner sides of the two first slot walls 121 of the first positioning ring groove 12 are respectively chamfered. Thus, the inner chamfer 1201 structure is more suitable for the spherical structure of the first activated carbon ball 200. When the first activated carbon ball 200 moves radially along the first positioning ring groove 12, the inner chamfer 1201 has an approximately surface blocking effect on the first activated carbon ball 200 (that is, the effective blocking range of the inner chamfer 1201 on the first activated carbon ball 200 is large), thus improving the positioning effect of the first activated carbon ball 200. If the inner chamfer 1201 is not provided, the first slot 120 will block the first activated carbon ball 200 linearly.

[0028] Furthermore, such as Figures 1 to 4As shown, the exhaust filter structure of this utility model also includes a positioning plate 4 and a second filter plate 5. The positioning plate 4 and the second filter plate 5 are disposed within the space enclosed by the ventilation base plate 1 and the ventilation cover plate 3. The positioning plate 4 is located between the second filter plate 5 and the first filter plate 2, with one side of the positioning plate 4 abutting against the first filter plate 2. Figure 4 and Figure 8 As shown, a second positioning ring groove 42 is formed on the opposite side of the positioning disc 4. Second groove walls 421 are respectively provided on both radial sides of the second positioning ring groove 42. A second groove opening 420 is formed in the second positioning ring groove 42, located between two corresponding second groove walls 421. The second positioning ring grooves 42 are concentrically distributed at equal intervals. The second filter disc 5 includes second activated carbon balls 500. The second positioning ring grooves 42 are respectively provided with circumferentially distributed second activated carbon balls 500, which are embedded in the corresponding second groove openings 420. Figure 3 and Figure 4 As shown, the second filter disk 5 is attached to the inner side of the grid 313 (in Figure 4 (From the visual direction downwards, to the left) That is to say, the first groove wall 121 and the positioning plate 4 are respectively located on both sides of the first filter plate 2, so that the positioning plate 4 can prevent the first activated carbon ball 200 from falling out of the first groove opening 120. For example, the second groove wall 421 is close to the first activated carbon ball 200, that is, the center of the first activated carbon ball 200 is roughly aligned with the second groove wall 421, and the second groove wall 421 and the grid 313 are respectively located on both sides of the second filter plate 5, so that the grid 313 prevents the second activated carbon ball 500 from leaving the second groove opening 420. For example, the center of the second activated carbon ball 500 is exactly aligned with the above-mentioned concentric grid strips. In the process of replacing the first filter plate 2 and the second filter plate 5, firstly, the first activated carbon ball 200 of the first filter plate 2 is put into each of the first positioning ring grooves 12, then the positioning plate 4 is placed on the first filter plate 2, then the second activated carbon ball 500 of the second filter plate 5 is distributed in each of the second positioning ring grooves 42, and finally the ventilation cover plate 3 is covered. In the embodiment where only the first filter disc 2 is provided, the first groove wall 121 is located to the left of the first activated carbon ball 200, while the grid 313 can be placed against the right side of the first activated carbon ball 200. The oil fume filtration effect is enhanced by providing the second filter disc 5. Figure 8 As shown, the positioning disk 4 also has a groove wall support 41. The second positioning ring groove 42 is integrated with the groove wall support 41. The outer end of the groove wall support 41 is attached to the inner wall of the first cylindrical part 11, so that the first cylindrical part 11 positions the positioning disk 4 radially along the first cylindrical part 11.

[0029] Furthermore, such as Figure 3 and Figure 4As shown, the second positioning ring groove 42 is radially offset from the first positioning ring groove 12. For example, the outermost second positioning ring groove 42 is approximately aligned with the middle position of the outermost first positioning ring groove 12 and the second (from the outside to the inside) first positioning ring groove 12. The spacing of the second positioning ring groove 42 is equal to the spacing of the first positioning ring groove 12. This allows the oil fume airflow to meander through the second filter disc 5 and the first filter disc 2, enabling the oil fume airflow to come into full contact with the activated carbon. This is beneficial for enhancing the adsorption effect of oil and dust in the oil fume airflow. Since both the second activated carbon ball 500 and the first activated carbon ball 200 can guide the oil fume airflow, the oil fume airflow passes through the exhaust filter structure of this utility model in an arc path. Therefore, the exhaust filter structure of this utility model still has the advantage of low wind resistance.

Claims

1. An exhaust filter structure, characterized in that: The system includes a ventilation chassis (1), a first filter disc (2), and a ventilation cover disc (3). The ventilation chassis (1) forms a first cylindrical portion (11) and a first positioning ring groove (12). The first positioning ring groove (12) has first groove walls (121) on both radial sides. The first positioning ring groove (12) has a first slot (120) between two corresponding first groove walls (121). The first positioning ring groove (12) is located inside the first cylindrical portion (11). The first positioning ring grooves (12) are concentrically spaced and equally spaced. The first filter disc (2) includes a first activated carbon ball (200), and the first positioning ring groove (12) is respectively provided with the first activated carbon ball (200) distributed in a circumferential direction. The first activated carbon ball (200) is embedded in the corresponding first groove (120). The ventilation cover disc (3) forms a second cylindrical part (31) and a grid (313). The first activated carbon ball (200) is disposed between the first groove wall (121) and the grid (313). The first cylindrical part (11) and the second cylindrical part (31) are detachably connected.

2. The exhaust filter structure according to claim 1, characterized in that: One end of the first cylindrical part (11) has an outer step (112) and a groove (111) is formed on the outer step (112). One end of the second cylindrical part (31) has an inner step (312) and a hook (311) is formed on the inner step (312). The outer step (112) and the inner step (312) are adapted to be inserted into each other, and the hook (311) is engaged with the corresponding groove (111).

3. The exhaust filter structure according to claim 2, characterized in that: The outer wall of the first cylindrical part (11) is aligned with the outer wall of the second cylindrical part (31). A groove (1111) for inserting a screwdriver is formed on the first cylindrical part (11). The groove (1111) is connected to the corresponding snap groove (111). The groove (1111) is axially connected to the edge of the second cylindrical part (31).

4. The exhaust filter structure according to claim 1, characterized in that: The first slot (120) has an inner chamfer (1201).

5. The exhaust filter structure according to claim 1, characterized in that: It also includes a positioning plate (4) and a second filter plate (5), which are disposed within the space enclosed by the ventilation base plate (1) and the ventilation cover plate (3). The positioning plate (4) is disposed between the second filter plate (5) and the first filter plate (2). One side of the positioning plate (4) is attached to the first filter plate (2), and a second positioning ring groove (42) is formed on the other side of the positioning plate (4). Second groove walls (421) are respectively provided on the radial sides of the second positioning ring groove (42). The groove (42) is formed with a second groove opening (420), the second groove opening (420) is located between two corresponding second groove walls (421), the second positioning ring grooves (42) are concentrically distributed at equal intervals, the second filter disc (5) includes a second activated carbon ball (500), the second positioning ring groove (42) is respectively provided with the second activated carbon ball (500) distributed circumferentially, the second activated carbon ball (500) is embedded in the corresponding second groove opening (420), and the second filter disc (5) is attached to the inner side of the grid (313).

6. The exhaust filter structure according to claim 5, characterized in that: The second positioning ring groove (42) is radially offset from the first positioning ring groove (12).

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