Flow guide mechanism and oil fume suction device

Abstract

The application relates to the technical field of oil fume suction equipment, in particular to a flow guide mechanism and an oil fume suction device. The flow guide mechanism comprises a flow guide component, the outer surface of the flow guide component comprises a flow resistance surface and a flow guide surface, the flow resistance surface is used for facing the air inlet direction of the air inlet, the flow guide surface is arranged on the leeward side of the flow resistance surface, the flow guide surface is arc-shaped, and the concave side of the arc-shaped surface faces the flow resistance surface. The oil fume suction device comprises the flow guide mechanism. Compared with the plate type and V type flow guide design in the prior art, the flow guide mechanism and the oil fume suction device have the advantages that the occupied space is small, the installation space is less limited, the air inlet flow field optimization demand of a large air volume air duct can be met, a good negative pressure effect can be formed at the air inlet, and thus the overflow of air flow under the air duct can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of kitchen fume extraction equipment technology, and in particular to a flow guiding mechanism and a kitchen fume extraction device. Background Technology

[0002] Users are constantly raising new requirements for the performance of range hoods. To meet these diverse performance needs, various types of range hoods have emerged. Although the structures of different types of range hoods differ, they all basically use flat or V-shaped baffles to solve the noise problem. These two traditional baffle designs are greatly affected by the installation space, and therefore, in cases where the space is unsuitable, they may even cause the flow field to deteriorate.

[0003] Currently, the air duct structure of large spaces is gradually being updated and upgraded, but there has been no improvement on the traditional air deflectors. Traditional flat air deflectors or V-shaped air deflectors are still used, which cannot meet the requirements. Summary of the Invention

[0004] The purpose of this application is to provide a flow guiding mechanism and a fume extraction device to solve, to a certain extent, the technical problem that the existing flow guiding structure cannot meet the air guiding requirements of the duct structure in a large space.

[0005] This application provides a flow guiding mechanism for being installed at the air inlet of the casing of a fume extraction device, the flow guiding mechanism being installed at the back of the casing;

[0006] The flow guiding mechanism includes a flow guiding component. The outer surface of the flow guiding component includes a flow blocking surface and a flow guiding surface. The flow blocking surface is used to face the air intake direction of the air inlet. The flow guiding surface is located on the leeward side of the flow blocking surface and is arc-shaped, with the concave side of the arc facing the flow blocking surface.

[0007] In the above technical solution, the flow guiding component further includes a flow guiding plate portion, a flow blocking plate portion and a back plate portion that are sequentially connected, and the flow guiding plate portion extends in an arc shape from one end connected to the flow blocking plate portion to one end connected to the back plate portion.

[0008] The guide plate, the baffle plate, and the back plate form a hollow cavity.

[0009] In any of the above technical solutions, the guide plate is further provided with a plurality of noise reduction through holes, and the plurality of noise reduction through holes penetrate the hollow cavity of the guide member.

[0010] In any of the above technical solutions, the diameter of the noise reduction through hole is further 2-2.5mm;

[0011] The distance between two adjacent noise reduction through holes is 8-10mm.

[0012] In any of the above technical solutions, the flow guiding mechanism further includes a layered sound-absorbing component, which is disposed in the hollow cavity and is attached to the flow guiding plate.

[0013] In any of the above technical solutions, the flow guiding mechanism further includes a snap-fit ​​component, which includes a first snap-fit ​​portion and a second snap-fit ​​portion connected in an L-shape;

[0014] The first snap-fit ​​portion is connected to the end of the guide plate portion along its length, and the other end of the second snap-fit ​​portion extends into the hollow cavity;

[0015] Both ends of the guide plate are provided with the snap-fit ​​members in the length direction, so that a snap-fit ​​space is formed between the snap-fit ​​members and the guide plate, and the layered sound-absorbing member is disposed in the snap-fit ​​space.

[0016] In any of the above technical solutions, the first snap-fit ​​portion is further provided with a first connecting through hole, and the flow guiding component is connected to the side plate in the width direction of the chassis through the first connecting through hole.

[0017] In any of the above technical solutions, the volute of the fume extraction device is further disposed on the back of the casing, and the bottom edge of the volute and the top edge of the flow guide member form a predetermined height difference;

[0018] The predetermined height difference is 5-10mm.

[0019] In any of the above technical solutions, the flow guiding mechanism further includes a connecting member, which includes a first fixing part, an extension part, and a second fixing part connected in a U-shape;

[0020] The volute of the fume extraction device is located on the back of the chassis. The first fixing part is used to connect with the bottom outer wall of the volute, and the second fixing part is used to connect with the outer wall of the volute that is opposite to the back of the fume extraction device.

[0021] The second fixing part is provided with a second connecting through hole, and the middle part of the flow guiding member in the length direction is connected to the connecting member through the second connecting through hole.

[0022] In any of the above technical solutions, the wall thickness of the guide plate portion is further 1.5-2.5mm;

[0023] The angle between the normal of the end of the guide plate that connects to the back plate and the normal of the end that connects to the baffle plate is 80-88°.

[0024] In any of the above technical solutions, the fume extraction device further includes an oil receiving component, which is disposed around the air inlet at the bottom of the casing;

[0025] The flow guiding mechanism is disposed at the top of the oil receiving component, and the flow guiding component gradually slopes downward from the middle to the end along the length direction of the flow guiding mechanism;

[0026] The inclination angle of the flow guiding component is 1-3°.

[0027] This application also provides a fume extraction device, including the flow guiding mechanism and the housing described in any of the above technical solutions.

[0028] Compared with the prior art, the beneficial effects of this application are as follows:

[0029] The airflow guiding mechanism provided in this application includes an airflow guiding component. The outer surface of the airflow guiding component includes a flow-blocking surface and a flow-guiding surface. The flow-guiding surface is formed in an arc shape. The flow-blocking surface prevents airflow from directly flowing into the chassis, and the arc-shaped flow-guiding surface optimizes the airflow field and reduces the impact of airflow on the internal walls of the chassis. Compared with the plate-type and V-type airflow guiding designs in the prior art, it occupies less space, is less restricted by installation space, and can meet the airflow field optimization requirements of large air volume duct structures. It can form a good negative pressure effect at the air inlet, thereby effectively reducing the overflow of airflow below the duct.

[0030] The fume extraction device provided in this application includes the aforementioned flow guiding mechanism, and thus can achieve all the beneficial effects of the aforementioned flow guiding mechanism. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a first structural schematic diagram of the flow guiding mechanism provided in Embodiment 1 of this application;

[0033] Figure 2 This is a schematic diagram of the second structure of the flow guiding mechanism provided in Embodiment 1 of this application;

[0034] Figure 3 A first structural schematic diagram of the connecting component of the flow guiding mechanism provided in Embodiment 1 of this application;

[0035] Figure 4This is a second structural schematic diagram of the connecting component of the flow guiding mechanism provided in Embodiment 1 of this application;

[0036] Figure 5 This is a first structural schematic diagram of the fume extraction device provided in Embodiment 2 of this application;

[0037] Figure 6 This is a schematic diagram of the second structure of the fume extraction device provided in Embodiment 2 of this application;

[0038] Figure 7 This is a schematic diagram of the third structure of the fume extraction device provided in Embodiment 2 of this application;

[0039] Figure 8 for Figure 7 A magnified view of a portion at point A;

[0040] Figure 9 This is a schematic diagram of the fourth structure of the fume extraction device provided in Embodiment 2 of this application;

[0041] Figure 10 This is a fifth structural schematic diagram of the fume extraction device provided in Embodiment 2 of this application;

[0042] Figure 11 This is a sixth structural schematic diagram of the fume extraction device provided in Embodiment 2 of this application;

[0043] Figure 12 for Figure 10 A magnified view of the area at point B;

[0044] Figure 13 This is a schematic diagram of the flow field simulation effect of the fume extraction device in this application.

[0045] Figure label:

[0046] 1-Flow guiding mechanism; 10-Flow guiding component; 100-Baffle plate section; 101-Flow guiding plate section; 102-Back plate section; 11-Layered sound absorption component; 12-Snap-fit ​​component; 121-First snap-fit ​​part; 122-Second snap-fit ​​part; 13-Noise reduction through hole; 14-First connecting through hole; 15-Connecting component; 150-First fixing part; 151-Extension part; 152-Second fixing part; 16-Second connecting through hole; 2-Fume extraction device; 20-Chassis; 200-Chassis back plate; 21-Vortex; 22-Oil receiving component. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Example 1

[0051] See Figures 1 to 4 and combined Figures 5 to 13 As shown, an embodiment of this application provides a flow guiding mechanism 1, which is used to be installed at the air inlet of the casing 20 of the fume extraction device 2. Specifically, the air inlet is located below the air duct inside the casing 20 and is a channel for airflow to enter the air duct. The flow guiding mechanism 1 is used to be installed on the back of the casing 20, thereby blocking the part of the air inlet near the back of the casing 20 and guiding the airflow at the air inlet.

[0052] In this embodiment, the airflow guiding mechanism 1 includes an airflow guiding member 10. The outer surface of the airflow guiding member 10 includes a flow-blocking surface and a flow-guiding surface. The flow-blocking surface is used to face the airflow direction of the air inlet, thereby blocking the airflow on the windward side of the flow-blocking surface to prevent the airflow from flowing directly into the interior of the chassis 20 along the back of the chassis 20. On this basis, the flow-guiding surface is set on the leeward side of the flow-blocking surface, so that the airflow at the air inlet bypasses the flow-blocking surface and flows into the chassis 20 along the flow-guiding surface, thereby preventing the airflow from spreading in the inner edge area of ​​the chassis 20 and ensuring the flow field optimization effect.

[0053] The guide surface is arc-shaped, with the concave side facing the obstruction surface. In other words, the convex side of the arc is used to contact the airflow and guide it. This arc-shaped guide surface helps improve the overall smoothness of the airflow, reduces the diffusion and accumulation effects of airflow in the internal space, reduces aerodynamic turbulence fluctuations, and forms a better negative pressure area at the air inlet, increasing the air volume flowing into the air inlet. It is suitable for chassis 20 with a large air volume duct structure inside. Figure 13 As shown, the flow field simulation diagram of the flow guide component 10 when applied to the fume extraction device 2 is shown under three air intake volumes. The air intake volumes corresponding to the three simulation states gradually increase from left to right. It can be seen that the airflow field is smooth and the distribution is very uniform under the three states, indicating that the aerodynamic turbulence fluctuation is small.

[0054] Alternatively, it is understood that the arc is not necessarily a circular arc, but can also be part of an ellipse or other smooth curve. Furthermore, the arc can be set as a circular arc with a radius of 50mm. The circular arc structure is simple, easy to process, and ensures that the assembly does not interfere, while also achieving a better flow field optimization effect.

[0055] Optionally, the flow guide 10 is elongated. In use, the length direction of the flow guide 10 is consistent with the width direction of the chassis 20, and the two ends of the length direction of the flow guide 10 are respectively connected to the two side plates of the width direction of the chassis 20.

[0056] In other words, the total length of the airflow guide component 10 is determined based on the spatial dimensions of the chassis 20, and it is necessary to ensure that it covers the lower space of the airflow duct of the chassis 20.

[0057] For oil fume extraction devices with large air duct structures, the total length of the flow guide 10 is usually quite long, for example, it can reach 436 mm. In order to facilitate processing and assembly, the flow guide 10 can be set as a symmetrical structure including the midpoint of its own length direction as the plane of symmetry.

[0058] In this embodiment, since the flow obstruction and flow guidance effects of the flow guiding member 10 are both achieved through the outer surface, its internal structure has no effect on its flow obstruction and flow guidance effects.

[0059] Therefore, by configuring the flow guiding member 10 to include a flow guiding plate portion 101, a flow blocking plate portion 100, and a back plate portion 102 that are sequentially connected, and by configuring the flow guiding plate portion 101, the flow blocking plate portion 100, and the back plate portion 102 to form a hollow cavity, the flow guiding member 10 is configured as a hollow structure. Compared with configuring the flow guiding member 10 as a solid structure, this can save material costs and also help to achieve lightweighting.

[0060] The guide plate portion 101 extends in an arc shape from one end connected to the baffle plate portion 100 to the other end connected to the back plate portion 102, thereby forming a guide surface through the outer surface of the guide plate portion 101.

[0061] It is understandable that the flow-blocking surface is formed by the outer surface of the baffle plate portion 100, and the back plate portion 102 faces the back of the chassis 20 by the outer surface of the back plate portion 102. As long as the flow-blocking function of the baffle plate portion 100 is not affected, the supporting function of the back plate portion 102 for the baffle plate portion 100 and the guide plate portion 101 can be set to any shape. Furthermore, in order to simplify the structure, both the baffle plate portion 100 and the back plate portion 102 can be set to a flat plate shape.

[0062] Optionally, the back plate portion 102, the baffle portion 100, and the guide plate portion 101 are formed by bending the same piece of sheet material.

[0063] Optionally, the wall thickness of the deflector portion 101 is 1.5-2.5mm, such as 1.5mm, 2mm or 2.5mm, which not only saves materials but also meets the requirements for noise reduction.

[0064] The normal line at the end of the guide vane section 101 that connects to the back plate section 102 is the first normal line, and the normal line at the end of the guide vane section 101 that connects to the baffle plate section 100 is the second normal line. The included angle between the first normal line and the second normal line is 80-88°, for example, 80°, 83°, 85° or 88°. The reason for not setting the included angle to 90° is to minimize the risk of spatial interference between the guide vane member 10 and surrounding components without affecting the overall smoothness of airflow.

[0065] In an optional embodiment, to optimize the sound absorption and noise reduction effect of the flow guide member 10, a plurality of noise reduction through holes 13 are provided on the flow guide plate 101. The plurality of noise reduction through holes 13 penetrate the hollow cavity of the flow guide member 10. Through the plurality of noise reduction through holes 13 penetrating the hollow cavity on the flow guide plate 101, a porous sound absorption effect is formed. After the airflow passes through the noise reduction through holes 13, it rubs against the inner wall surface of the flow guide plate 101 and causes the air in the hollow cavity to vibrate. In this process, the sound wave energy is converted into heat energy and consumed, thereby reducing noise radiation.

[0066] Among them, the sound absorption effect of micropores is relatively high, so the aperture of the noise reduction through hole 13 should not be set too large. The diameter of the noise reduction through hole 13 should be set to 2-2.5mm, such as 2mm, 2.3mm or 2.5mm, which can improve the noise reduction effect of the noise reduction through hole 13.

[0067] Furthermore, in order to ensure a certain porosity and thus the sound absorption effect, the distance between two adjacent noise reduction through holes 13 is 8-10mm, such as 8mm, 9mm or 10mm.

[0068] Optionally, multiple noise reduction through holes 13 are arranged in an array on the guide plate portion 101, and further, they can be set to an array shape in the form of multiple rows and columns.

[0069] In this embodiment, the hollow cavity provides sufficient space for the layered sound-absorbing component 11. To improve the sound absorption effect, the layered sound-absorbing component 11 is installed in the hollow cavity. The layered sound-absorbing component 11 is attached to the guide plate, thereby utilizing the characteristics of the layered sound-absorbing component 11 to absorb part of the air in the airflow passing through the noise reduction through-hole 13, thereby enhancing the noise reduction effect on the basis of porous sound absorption.

[0070] Furthermore, this solution, which adds layered sound-absorbing components 11, can simplify or even replace the complex noise reduction structure inside the fume extraction device 2, thereby improving the feasibility of implementing the overall noise reduction solution.

[0071] Alternatively, the layered sound-absorbing component 11 can be a layer of noise-reducing cotton that is tightly attached to the inner side of the guide plate portion 101.

[0072] In an optional embodiment, in order to facilitate the fixing of the layered sound-absorbing component 11, the flow guiding component 10 further includes a snap-fit ​​component 12. The snap-fit ​​component 12 includes a first snap-fit ​​portion 121 and a second snap-fit ​​portion 122 connected in an L-shape. It can be understood that the included angle between the first snap-fit ​​portion 121 and the second snap-fit ​​portion 122 does not have to be an absolute 90°, as long as it is approximately 90°.

[0073] The first snap-fit ​​portion 121 is connected to the end of the guide plate portion 101 in the longitudinal direction, and the other end of the second snap-fit ​​portion 122 extends into the hollow cavity, thereby forming a gap between the second snap-fit ​​portion 122 and the inner surface of the guide plate portion 101, which allows the end of the layered sound-absorbing member 11 to be inserted.

[0074] The layered sound-absorbing member 11 is configured to completely adhere to the guide plate portion 101 along its length. Each end of the guide plate portion 101 has a snap-fit ​​member 12, allowing both ends of the layered sound-absorbing member 11 to engage with the snap-fit ​​members 12 at both ends of the guide plate portion 101. This creates a snap-fit ​​space between the snap-fit ​​members 12 and the guide plate portion 101, within which the layered sound-absorbing member 11 is positioned. In other words, the layered sound-absorbing member 11 can be reliably fixed using the snap-fit ​​members 12.

[0075] Optionally, multiple snap-fit ​​members 12 are provided at both ends of the guide plate portion 101 along its length direction, thereby improving the stability of the layered sound-absorbing member 11.

[0076] In this embodiment, as one way to connect the flow guiding mechanism 1 to the chassis 20, the first snap-fit ​​part 121 is provided with a first connecting through hole 14. The flow guiding member 10 is connected to the side plate of the chassis 20 in the width direction through the first connecting through hole 14, so that the flow guiding member 10 can be fixed to the chassis 20 by screws and the first connecting through hole 14. Specifically, the chassis 20 has two opposing side plates in the width direction, and snap-fit ​​parts with first connecting through holes 14 are installed on both sides of the flow guiding member 10 in the length direction. The first connecting through holes 14 of the snap-fit ​​parts on both sides are connected to the two side plates of the chassis 20 respectively, so that the two ends of the flow guiding member 10 in the length direction can be fixed to the two side plates in the width direction of the chassis 20 respectively.

[0077] In other words, the snap-fit ​​component 12 serves a dual fixing function: on the one hand, it acts as a fixing structure between the airflow guide component 10 and the chassis 20, and on the other hand, it acts as a fixing structure between the airflow guide component 10 and the layered sound-absorbing component 11.

[0078] Furthermore, in order to form a large airflow duct within the chassis 20, a large-radius, wide volute 21 is provided inside the chassis 20. The volute 21 of the fume extraction device 2 is located at the back of the chassis 20. Specifically, the volute 21 is installed on the back panel 200 of the chassis, and the airflow guide 10 is installed below the volute 21. To avoid spatial interference between the volute 21 and the airflow guide 10, a predetermined height difference is formed between the bottom edge of the volute 21 and the top edge of the airflow guide 10. The predetermined height difference is 5-10mm, for example, 5mm, 6mm, 7mm, 8mm, 9mm, or 10mm.

[0079] In this embodiment, as another implementation of connecting the flow guiding mechanism 1 to the chassis 20, the flow guiding mechanism 1 further includes a connecting member 15, which includes a first fixing part 150, an extension part 151, and a second fixing part 152 connected in a U-shape. Optionally, the first fixing part 150, the extension part 151, and the second fixing part 152 can all be configured as plates.

[0080] The volute 21 of the fume extraction device 2 is located on the back of the housing 20. The first fixing part 150 is used to connect with the bottom outer wall of the volute 21. Specifically, in the use state, the first fixing part 150 is connected to the bottom of the circumferential outer wall of the volute 21. In order to stably connect the first fixing part 150 with the volute 21, the first fixing part 150 is welded to the volute 21, for example, by spot welding.

[0081] The second fixing part 152 is used to connect to the outer wall of the volute 21 opposite to the back of the fume extraction device 2. Specifically, in the use state, the second fixing part 152 is connected to one of the axial end faces of the volute 21 opposite to the back plate 200 of the casing. In order to stably connect the second fixing part 152 to the volute 21, the second fixing part 152 is welded to the volute 21, for example, by spot welding.

[0082] Alternatively, in order to increase the welding area between the second fixing part 152 and the volute 21, the second fixing part 152 can be set to be longer than the first fixing part 150.

[0083] The second fixing part 152 is provided with a second connecting through hole 16. The middle part of the flow guiding member 10 in the length direction is connected to the connecting member 15 through the second connecting through hole 16. Specifically, the flow guiding member 10 can be directly fixed to the connecting member 15 by screws and the second connecting through hole 16, which makes the fixing of the flow guiding member 10 more efficient and quick. Moreover, the connecting member 15 has a simple structure, strong stability, and can also play a role in increasing the structural rigidity of the volute 21 at the bottom of the volute 21.

[0084] It is understandable that the scheme of fixing the flow guide member 10 by connecting member 15 and the scheme of fixing the flow guide member 10 by snap-fit ​​member 12 can be used in combination or separately. Generally, using one of them alone can meet the fixing requirements of the flow guide member 10, but if there are special fixing requirements, the two can be used in combination.

[0085] In this embodiment, the fume extraction device 2 also includes an oil receiving component 22, which is arranged around the air inlet at the bottom of the casing 20.

[0086] The flow guiding mechanism 1 is located at the top of the oil receiving component 22. The flow guiding component 10 gradually slopes downward from the middle to the end along the length direction of the flow guiding mechanism 1. So when oil drips onto the surface of the flow guiding component 10 or into the hollow cavity, the oil can flow into the oil receiving component 22 under the action of gravity along the downward slope of the flow guiding component 10, thus avoiding the long-term accumulation of oil on the flow guiding component 10, which would affect the flow guiding effect and noise reduction effect of the flow guiding component 10.

[0087] Specifically, the angle of inclination of the flow guide member 10 is 1-3°, for example 1°, 1.3°, 2°, 2.5° or 3°.

[0088] Example 2

[0089] Combination Figures 1 to 4 See also Figures 5 to 13As shown, Embodiment 2 provides a fume extraction device 2, which includes the flow guiding mechanism 1 in Embodiment 1. The technical features of the flow guiding mechanism 1 disclosed in Embodiment 1 are also applicable to this embodiment, and the technical features of the flow guiding mechanism 1 disclosed in Embodiment 1 will not be described again.

[0090] The fume extraction device 2 in this embodiment has the advantages of the flow guiding mechanism in Embodiment 1. The advantages of the flow guiding mechanism 1 disclosed in Embodiment 1 will not be repeated here.

[0091] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention. In addition, those skilled in the art can understand that although some embodiments described herein include certain features included in other embodiments but not other features, combinations of features of different embodiments are meant to be within the scope of the present invention and form different embodiments. For example, any one of the claimed embodiments can be used in any combination. The information disclosed in this background section is only intended to enhance the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form implying that such information constitutes prior art known to those skilled in the art.

Claims

1. A flow guiding mechanism, characterized in that, The air inlet is installed at the air inlet of the enclosure of the fume extraction device. The air guiding mechanism is installed at the back of the enclosure. The air guiding mechanism blocks the part of the air inlet near the back of the enclosure and guides the airflow at the air inlet. The flow guiding mechanism includes a flow guiding component. The outer surface of the flow guiding component includes a flow blocking surface and a flow guiding surface. The flow blocking surface is used to face the air intake direction of the air inlet. The flow guiding surface is located on the leeward side of the flow blocking surface and the flow guiding surface is arc-shaped with the concave side of the arc facing the flow blocking surface. The flow guiding component is elongated, and in use, the length direction of the flow guiding component is consistent with the width direction of the chassis; The flow guiding component includes a flow guiding plate portion, a flow blocking plate portion, and a back plate portion that are sequentially connected. The flow guiding plate portion extends in an arc shape from one end connected to the flow blocking plate portion to the other end connected to the back plate portion. The guide plate, the baffle plate, and the back plate form a hollow cavity.

2. The flow guiding mechanism according to claim 1, characterized in that, The wall thickness of the guide plate is 1.5-2.5 mm; The angle between the normal of the end of the guide plate that connects to the back plate and the normal of the end that connects to the baffle plate is 80-88°.

3. The flow guiding mechanism according to claim 1, characterized in that, The flow guide plate is provided with multiple noise reduction through holes, which penetrate the hollow cavity of the flow guide component.

4. The flow guiding mechanism according to claim 3, characterized in that, The diameter of the noise reduction through-hole is 2-2.5mm; The distance between two adjacent noise reduction through holes is 8-10mm.

5. The flow guiding mechanism according to claim 3, characterized in that, It also includes a layered sound-absorbing component, which is disposed in the hollow cavity and is attached to the guide plate portion.

6. The flow guiding mechanism according to claim 5, characterized in that, It also includes a snap-fit ​​component, which includes a first snap-fit ​​portion and a second snap-fit ​​portion connected in an L-shape; The first snap-fit ​​portion is connected to the end of the guide plate portion along its length, and the other end of the second snap-fit ​​portion extends into the hollow cavity; Both ends of the guide plate are provided with the snap-fit ​​members in the length direction, so that a snap-fit ​​space is formed between the snap-fit ​​members and the guide plate, and the layered sound-absorbing member is disposed in the snap-fit ​​space.

7. The flow guiding mechanism according to claim 6, characterized in that, The first snap-fit ​​part is provided with a first connecting through hole, and the flow guiding component is connected to the side plate in the width direction of the chassis through the first connecting through hole.

8. The flow guiding mechanism according to claim 7, characterized in that, The volute of the fume extraction device is located at the back of the chassis, and the bottom edge of the volute and the top edge of the air guide member form a predetermined height difference. The predetermined height difference is 5-10mm.

9. The flow guiding mechanism according to claim 6, characterized in that, The flow guiding mechanism also includes a connecting member, which includes a first fixing part, an extension part, and a second fixing part connected in a U-shape. The volute of the fume extraction device is located on the back of the chassis. The first fixing part is used to connect with the bottom outer wall of the volute, and the second fixing part is used to connect with the outer wall of the volute that is opposite to the back of the fume extraction device. The second fixing part is provided with a second connecting through hole, and the middle part of the flow guiding member in the length direction is connected to the connecting member through the second connecting through hole.

10. The flow guiding mechanism according to claim 1, characterized in that, The fume extraction device also includes an oil receiving component, which is arranged around the air inlet at the bottom of the chassis; The flow guiding mechanism is disposed at the top of the oil receiving component, and the flow guiding component gradually slopes downward from the middle to the end along the length direction of the flow guiding mechanism; The inclination angle of the flow guiding component is 1-3°.

11. A fume extraction device, characterized in that, Includes the flow guiding mechanism and the chassis as described in any one of claims 1 to 10.

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