Range hood
By setting a smoke-blocking part and an inclined air inlet in the horizontal smoke-gathering chamber at the head of the range hood, the problem of oil fume escape is solved and the smoke extraction efficiency is improved.
Patent Information
- Application Number
- CN202423315488.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In existing range hoods, cooking fumes easily escape from the horizontal smoke collection chamber at the head of the smoke collection hood, resulting in reduced smoke extraction efficiency.
A first smoke-blocking part is provided on the front wall of the transverse smoke-collecting chamber at the head of the smoke hood, extending along the length of the smoke hood, and combined with a second smoke-blocking part to cut off the escape path of the oil fumes. An inclined upper air inlet is added to improve the smoke extraction effect.
By designing a smoke-blocking section, the escape of cooking fumes is reduced, the amount of smoke drawn from the upper air inlet is increased, and the smoke extraction efficiency of the range hood is improved.
Smart Images
Figure CN223649384U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of range hood technology, and in particular to a range hood. Background Technology
[0002] Range hoods are devices used to extract and exhaust cooking fumes, and have gradually become an indispensable household appliance for purifying the kitchen environment.
[0003] In range hoods, the bottom of the smoke collection hood has a downward-facing horizontal smoke-gathering chamber. An upward air inlet is located within this chamber to draw in and exhaust rising fumes. However, the relatively small thickness of the head limits the depth of the horizontal smoke-gathering chamber, causing fumes to easily escape and reducing the range hood's smoke extraction efficiency. Utility Model Content
[0004] The technical problem solved by this utility model is to provide a range hood that can effectively solve the technical problem in the prior art where oil fumes easily escape from the horizontal smoke collection chamber at the head of the smoke collection hood, reducing the smoke extraction efficiency.
[0005] The above-mentioned technical problems are solved by the following technical solutions:
[0006] A range hood includes a smoke collection hood, a transverse smoke collection chamber at the bottom of the head of the smoke collection hood, and an upper air inlet hole on the inner top wall of the transverse smoke collection chamber; a first smoke blocking part is provided on the inner front wall of the transverse smoke collection chamber along the width direction of the smoke collection hood, and the first smoke blocking part extends along the length direction of the smoke collection hood.
[0007] The range hood described in this utility model has the following advantages compared with the prior art:
[0008] By providing a first smoke-blocking part protruding from the inner front wall of the transverse smoke-gathering chamber at the head of the smoke hood, and extending along the length of the smoke hood, the first smoke-blocking part cuts off the escape path of the oil fumes, reducing the escape of oil fumes from the transverse smoke-gathering chamber. This facilitates the intake of oil fumes from the transverse smoke-gathering chamber into the smoke hood through the upper air inlet, thereby increasing the amount of smoke drawn through the upper air inlet and thus improving the smoke extraction efficiency of the range hood.
[0009] In one embodiment, the transverse smoke collection chamber is provided with a second smoke-blocking part on both inner sidewalls along the length direction of the smoke collection hood, and the second smoke-blocking part extends along the width direction of the smoke collection hood.
[0010] In one embodiment, the second smoke-blocking portion extends from the front end of the smoke collection hood along the width direction to the front end of the corresponding inner sidewall;
[0011] The two ends of the first smoke-blocking part extend to the two ends of the inner front wall along the length of the smoke collection hood, and are respectively connected to the front end of the second smoke-blocking part.
[0012] In one embodiment, along the width direction of the smoke hood, the distance between the first smoke-blocking portion and the outer edge of the inner front wall gradually decreases from the middle to both ends, so that the projection of the first smoke-blocking portion onto the inner front wall in a direction perpendicular to the inner front wall is V-shaped.
[0013] In one embodiment, along the length of the smoke hood, the height of the first smoke-blocking portion protruding from the inner front wall gradually decreases from the middle to both ends.
[0014] In one embodiment, the inner side of the first smoke-blocking part in the width direction is inclined from top to bottom toward the back plate of the smoke hood along the height direction of the smoke hood, and the inner side is connected to the inner front wall at an angle.
[0015] In one embodiment, the inclination angle of the inner side relative to the height direction of the smoke hood is α, then 0°<α≤30°.
[0016] In one embodiment, the outer side of the first smoke-blocking part in the width direction is connected to the inner front wall by a rounded transition.
[0017] In one embodiment, the end of the first smoke-blocking portion away from the inner front wall includes two guide surfaces connected at an included angle;
[0018] Alternatively, one end of the inner side of the first smoke-blocking part in the width direction is connected to one end of the outer side to form two guide edges connected at an included angle.
[0019] In one embodiment, the upper air inlet includes a first air inlet and a second air inlet. The inner top wall is provided with a plurality of first air inlets spaced apart along the length direction of the smoke hood, and the first air inlets extend along the width direction of the smoke hood. The inner top wall is also provided with a second air inlet extending along the length direction of the smoke hood, and the second air inlet is located between the front end of the first air inlet along the width direction of the smoke hood and the inner front wall.
[0020] Alternatively, the upper air inlet is inclined along the width direction of the smoke hood. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the first structure of the smoke collection hood provided in Embodiment 1 of this utility model;
[0022] Figure 2 This is a partial structural schematic diagram of the smoke collection hood provided in Embodiment 1 of this utility model;
[0023] Figure 3 This is a cross-sectional view of the smoke collection hood provided in Embodiment 1 of this utility model;
[0024] Figure 4 yes Figure 3 Enlarged view of point A in the middle;
[0025] Figure 5 This is a schematic diagram of the second structure of the smoke collection hood provided in Embodiment 1 of this utility model;
[0026] Figure 6 yes Figure 5 Enlarged view at point B in the middle;
[0027] Figure 7 This is a partial structural schematic diagram of the smoke collection hood provided in Embodiment 2 of this utility model.
[0028] The component names and labels in the diagram are as follows:
[0029] 100. Smoke hood; 10. Front side panel; 101. Vertical smoke collection chamber; 20. Back panel; 30. Smoke collection plate; 40. Head;
[0030] 1. Horizontal smoke collection chamber; 11. Inner top wall; 12. Inner front wall; 121. Outer edge; 13. Inner side wall; 2. First smoke baffle; 21. Inner side; 22. Outer side; 23. Guide surface; 24. Guide edge; 3. Second smoke baffle; 4. First air inlet; 5. Second air inlet. Detailed Implementation
[0031] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.
[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0034] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.
[0035] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0036] Example 1
[0037] like Figure 1 and Figure 2 As shown, this embodiment proposes a range hood, which includes a smoke collection hood 100 and a fan box. The smoke collection hood 100 includes a front side plate 10, a back plate 20, and a smoke gathering plate 30. A vertical smoke gathering chamber 101 is formed on the front side plate 10, and a lower air inlet is formed inside the vertical smoke gathering chamber 101. The smoke gathering plate 30 is movably installed on the front side plate 10 and can be opened or closed manually or automatically. When the range hood is not working, the smoke gathering plate 30 covers the front end of the vertical smoke gathering chamber 101. When the range hood is working, the smoke gathering plate 30 flips relative to the front side plate 10 and opens the vertical smoke gathering chamber 101 to draw the oil fumes generated by the stove opening below the smoke collection hood 100 into the smoke collection chamber of the smoke collection hood 100 through the lower air inlet.
[0038] A downward-facing horizontal smoke-gathering chamber 1 is provided at the bottom of the head 40 of the smoke hood 100. An upper air inlet is provided on the inner top wall 11 of the horizontal smoke-gathering chamber 1, allowing air to rise from the stove opening (along...). Figure 3The fumes (in the direction indicated by the middle arrow) are drawn into the smoke collection chamber through the upper air inlet. A blower box is installed on the top of the smoke collection hood 100, and a fan assembly is installed inside the blower box to discharge the fumes from the smoke collection chamber to the outside. In this embodiment, the inner top wall 11 of the transverse smoke collection chamber 1 is a separate oil mesh plate, with an upper air inlet on the oil mesh plate. In other embodiments, the inner top wall 11 of the transverse smoke collection chamber 1 can also be integrally formed at the bottom end of the head 40.
[0039] Because the thickness of the head 40 is relatively small, the depth of the horizontal smoke collection chamber 1 is limited, which makes it easy for oil fumes to escape from the horizontal smoke collection chamber 1, reducing the smoke extraction efficiency of the range hood.
[0040] To solve the above problems, such as Figure 1 and Figure 2 As shown, in this embodiment of the range hood, a first smoke-blocking part 2 protrudes from the inner front wall 12 of the transverse smoke-collecting chamber 1 along the width direction (front-back direction in the figure) of the smoke collection hood 100. The first smoke-blocking part 2 extends along the length direction (left-right direction in the figure) of the smoke collection hood 100. By providing the first smoke-blocking part 2 protruding from the inner front wall 12 of the transverse smoke-collecting chamber 1 at the head 40 of the smoke collection hood 100, and extending along the length direction of the smoke collection hood 100, the first smoke-blocking part 2 cuts off the escape path of the fumes, reducing the escape of fumes from the transverse smoke-collecting chamber 1. This facilitates the intake of fumes from the transverse smoke-collecting chamber 1 into the smoke collection hood 100 through the upper air inlet, increasing the amount of smoke drawn through the upper air inlet and thus improving the smoke extraction efficiency of the range hood.
[0041] like Figure 3 and Figure 4 As shown, the inner front wall 12 of the transverse smoke collection chamber 1 is inclined downwards towards the front of the smoke collection hood 100 along the height direction (vertical direction in the figure) of the smoke collection hood 100, in order to absorb the rising oil fumes and increase the smoke collection volume. Since most of the oil fumes escape from the inner front wall 12, a first smoke-blocking part 2 is provided at the inner front wall 12 to cut off the escape path of the oil fumes, so that the oil fumes that are about to escape are blocked and guided by the first smoke-blocking part 2 along the... Figure 4 The direction indicated by the middle arrow returns to the horizontal smoke collection chamber 1, which facilitates the upper air inlet to draw the oil fumes into the smoke collection hood 100.
[0042] like Figure 1 and Figure 2 As shown, along the width direction of the smoke hood 100, the distance between the first smoke-blocking part 2 and the outer edge 121 of the inner front wall 12 gradually decreases from the middle to both ends, so that the projection of the first smoke-blocking part 2 onto the inner front wall 12 in a direction perpendicular to the inner front wall 12 is V-shaped. That is, based on the inclined setting of the inner front wall 11, by setting the first smoke-blocking part 2 as a pressed shape with the middle position recessed backward, when water droplets (water vapor in the flue gas) or oil fumes condense into oil droplets, they can be projected onto the end face of the first smoke-blocking part 2 away from the inner front wall 12 along... Figure 2 The trajectory indicated by the middle arrow guides the flow from the center to the left and right sides to the two inner walls 13 of the transverse smoke collection chamber 1 along the length of the smoke collection hood 100, in order to improve the situation where oil or water droplets fall.
[0043] Furthermore, along the length of the smoke hood 100, the height of the first smoke-blocking part 2 protruding from the inner front wall 12 gradually decreases from the middle to both ends. It should be noted that, along the direction perpendicular to the inner front wall 12, the end of the first smoke-blocking part 2 furthest from the inner front wall 12 is the top, and the distance between the top of the first smoke-blocking part 2 and the inner front wall 12 is the height of the first smoke-blocking part 2 protruding from the inner front wall 12. Specifically, the end of the first smoke-blocking part 2 furthest from the inner front wall 12 includes two guide surfaces 23 connected at an included angle, thereby allowing oil or water droplets to be rapidly guided along the two guide surfaces 23 to the two inner sidewalls 13 of the transverse smoke-collecting chamber 1.
[0044] like Figure 2 As shown, the angle between the projection of each guide surface 23 onto the inner front wall 12 in a direction perpendicular to the inner front wall 12 and the outer edge 121 of the inner front wall 12 is β, where 7°≤β≤30°. The angle β can be 7°, 10°, 15°, 20°, 25°, or 30°, etc., to ensure that the projection of the first smoke-blocking part 2 onto the inner front wall 12 in a direction perpendicular to the inner front wall 12 is V-shaped. The maximum height of the first smoke-blocking part 2 protruding from the inner front wall 12 is h, where 5mm≤h≤8mm. The maximum height h is the distance between the top of the intersection of the two guide surfaces 23 and the inner front wall 12. The maximum height h can be 5mm, 6mm, 7mm, or 8mm, etc., to ensure that the first smoke-blocking part 2 has a good smoke-blocking effect. If the maximum height h is too large, the tilt angle of the two guide surfaces 23 will increase, easily causing oil or water droplets on the two guide surfaces 23 to fall off, affecting the guiding effect. If the maximum height h is too small, it will weaken the blocking effect of the first smoke-blocking part 2 on the escaping fumes.
[0045] like Figure 4 As shown, the inner side 21 of the first smoke-blocking part 2 in the width direction is inclined downwards towards the back plate 20 of the smoke-collecting hood 100 along the height direction of the smoke-collecting hood 100, and the inner side 21 is connected to the inner front wall 12 at an angle, so that the first smoke-blocking part 2 cuts off the escape path of the oil fumes through the inner side 21, so that the oil fumes change the flow direction and flow back into the transverse smoke-collecting chamber 1. The width direction of the first smoke-blocking part 2 is parallel to the inner front wall 12.
[0046] In this embodiment, as Figure 4As shown, the inclination angle of the inner side surface 21 relative to the height direction of the smoke collection hood 100 is α, where 0° < α ≤ 30°. Specifically, the inclination angle α can be 5°, 10°, 15°, 20°, 25°, or 30°, etc., to ensure that the first smoke-blocking part 2 has a good blocking and guiding effect on the escaping fumes. If the inclination angle α is too large, the angle between the inner side surface 21 and the inner front wall 12 will be too large, weakening the blocking and guiding effect on the fumes.
[0047] In one embodiment, the outer side 22 of the first smoke-blocking part 2 in the width direction is connected to the inner front wall 12 by a rounded corner. By providing a rounded corner between the outer side 22 and the inner front wall 12, the rising fumes can be smoothly drawn into the transverse smoke-collecting cavity 1 after passing through the outer edge 121 and the outer side 22 of the inner front wall 12, thereby improving the smoke-collecting efficiency of the upper air inlet.
[0048] like Figures 1-5 As shown, the two inner sidewalls 13 of the transverse smoke collection chamber 1 along the length of the smoke collection hood 100 are each provided with a second smoke baffle 3, which extends along the width of the smoke collection hood 100. Specifically, the second smoke baffle 3 is a strip-shaped pressed structure of equal height. By setting the second smoke baffle 3, the escape of oil fumes from the left and right sides of the transverse smoke collection chamber 1 can be effectively reduced, further improving the problem of oil fume escape in the transverse smoke collection chamber 1, thereby improving the smoke extraction efficiency of the range hood. At the same time, the second smoke baffle 3 can also work with the first smoke baffle 2 to guide oil droplets or water droplets, so that the oil droplets and water droplets guided down by the first smoke baffle 2 continue to slide down along the second smoke baffle 3, preventing oil droplets and water droplets from falling in the transverse smoke collection chamber 1.
[0049] It should be noted that the first smoke-blocking part 2 can be integrally formed from the inner front wall 12 of the transverse smoke-collecting cavity 1 by stamping, and the second smoke-blocking part 3 can be integrally formed from the inner side wall 13 of the transverse smoke-collecting cavity 1 by stamping. Of course, the first smoke-blocking part 2 and the second smoke-blocking part 3 are separate components from the transverse smoke-collecting cavity 1. That is, the first smoke-blocking part 2 can be fixedly installed to the inner front wall 12 of the transverse smoke-collecting cavity 1 by welding, snap-fitting, or screws, and the second smoke-blocking part 3 can be fixedly installed to the inner front wall 12 of the transverse smoke-collecting cavity 1 by welding, snap-fitting, or screws.
[0050] In one embodiment, the second smoke-blocking part 3 extends from the front end of the smoke collection hood 100 along its width direction to the front end of the corresponding inner sidewall 13. The two ends of the first smoke-blocking part 2 extend to the two ends of the inner front wall 12 along the length direction of the smoke collection hood 100, and are respectively connected to the front ends of the second smoke-blocking parts 3. Through this arrangement, the left and right ends of the first smoke-blocking part 2 are respectively connected to or integrated with the front ends of the two second smoke-blocking parts 3, so that oil droplets or water droplets can flow along the two guide surfaces 23 of the first smoke-blocking part 2 to the left and right sides and then continue to flow along the second smoke-blocking parts 3, reducing the risk of water droplets or oil droplets falling and further improving the guiding effect on oil droplets and water droplets. In other embodiments, the left and right ends of the first smoke-blocking part 2 may not contact the front ends of the two second smoke-blocking parts 3, so that oil droplets or water droplets flow along the two guide surfaces 23 to the left and right inner sidewalls 13 and then continue to flow downwards along the left and right inner sidewalls 13.
[0051] In one embodiment, such as Figure 5 and Figure 6 As shown, the upper air inlet includes a first air inlet 4 and a second air inlet 5. Multiple first air inlets 4 are spaced apart along the length of the smoke hood 100 on the inner top wall 11, and the first air inlets 4 extend along the width of the smoke hood 100. The inner top wall 11 also has a second air inlet 5 extending along the length of the smoke hood 100, located between the front end of the first air inlet 4 along the width of the smoke hood 100 and the inner front wall 12. Specifically, the multiple first air inlets 4 are spaced apart in the left-right direction, and there is one second air inlet 5 extending in the left-right direction. This allows the fumes passing through the gaps between the multiple first air inlets 4 to be absorbed by the second air inlet 5, reducing the escape of fumes and improving the smoke extraction efficiency of the upper air inlet.
[0052] Specifically, the width of the second air inlet 5 is greater than 8mm to maximize its smoke extraction area and improve smoke extraction efficiency. Alternatively, multiple second air inlets 5 can be spaced along the width of the smoke hood 100, based on the space between the front end of the first air inlet 4 and the inner front wall 12. Furthermore, the second air inlets 5 are positioned as close as possible to the inner front wall 12 to absorb as much of the escaping fumes as possible, further reducing the escape of fumes.
[0053] In another embodiment, the upper air inlet is inclined along the width direction of the smoke collection hood 100, so that the upper air inlet is inclined in the front-to-back direction, which can also reduce the escape of oil fumes and improve the smoke extraction efficiency of the upper air inlet.
[0054] Example 2
[0055] like Figure 7As shown, this embodiment proposes a range hood, which has a basically the same structure as the range hood in Embodiment 1. The main difference between the range hood in this embodiment and that in Embodiment 1 is that one end of the inner side 21 of the first smoke-blocking part 2 in the width direction is connected to one end of the outer side 22, forming two guide edges 24 connected at an included angle. By setting the first smoke-blocking part 2, the escape path of the fumes is cut off, so that the fumes that are about to escape are blocked and guided by the first smoke-blocking part 2 along... Figure 7 The direction indicated by the middle arrow returns to the horizontal smoke collection chamber 1, which facilitates the upper air inlet to draw the oil fumes into the smoke collection hood 100.
[0056] Specifically, the first smoke-blocking part 2 has a roughly triangular cross-section and is a pressed structure. The top of the first smoke-blocking part 2 protruding from the inner front wall 12 includes two guide edges 24 connected at an included angle. Based on the inclined arrangement of the inner front wall 12, water droplets or oil droplets can be guided on the two guide edges 24 to the two inner sidewalls 13 along the transverse smoke-collecting cavity 1, thus improving the situation where oil droplets or water droplets fall.
[0057] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A range hood, characterized in that, The range hood includes a smoke collection hood (100), and a transverse smoke collection chamber (1) is provided at the bottom of the head (40) of the smoke collection hood (100). An upper air inlet is provided on the inner top wall (11) of the transverse smoke collection chamber (1). A first smoke blocking part (2) is provided on the inner front wall (12) of the transverse smoke collection chamber (1) along the width direction of the smoke collection hood (100). The first smoke blocking part (2) extends along the length direction of the smoke collection hood (100).
2. The range hood according to claim 1, characterized in that, The transverse smoke collection chamber (1) has two inner sidewalls (13) protruding with second smoke blocking parts (3) along the length direction of the smoke collection hood (100), and the second smoke blocking parts (3) extend along the width direction of the smoke collection hood (100).
3. The range hood according to claim 2, characterized in that, The second smoke-blocking part (3) extends from the front end of the smoke collection hood (100) in the width direction to the front end of the corresponding inner sidewall (13); The two ends of the first smoke-blocking part (2) extend to the two ends of the inner front wall (12) along the length direction of the smoke collection hood (100), and are respectively connected to the front end of the second smoke-blocking part (3).
4. The range hood according to claim 1, characterized in that, Along the width direction of the smoke hood (100), the distance between the first smoke-blocking part (2) and the outer edge (121) of the inner front wall (12) gradually decreases from the middle to both ends, so that the projection of the first smoke-blocking part (2) on the inner front wall (12) in a direction perpendicular to the inner front wall (12) is V-shaped.
5. The range hood according to claim 4, characterized in that, Along the length of the smoke hood (100), the height of the inner front wall (12) of the first smoke baffle (2) gradually decreases from the middle to both ends.
6. The range hood according to claim 5, characterized in that, The inner side (21) of the first smoke-blocking part (2) is inclined from top to bottom toward the back plate (20) of the smoke-collecting hood (100) along the height direction of the smoke-collecting hood (100), and the inner side (21) is connected to the inner front wall (12) at an angle.
7. The range hood according to claim 6, characterized in that, If the inclination angle of the inner side surface (21) relative to the height direction of the smoke hood (100) is α, then 0°<α≤30°.
8. The range hood according to claim 6, characterized in that, The outer side (22) of the first smoke-blocking part (2) in the width direction is connected to the inner front wall (12) by a rounded corner transition.
9. The range hood according to claim 5, characterized in that, The first smoke-blocking part (2) has two guide surfaces (23) connected at an included angle at one end away from the inner front wall (12); Alternatively, one end of the inner side (21) of the first smoke-blocking part (2) in the width direction is connected to one end of the outer side (22) to form two guide edges (24) connected at an angle.
10. The range hood according to any one of claims 1 to 9, characterized in that, The upper air inlet includes a first air inlet (4) and a second air inlet (5). The inner top wall (11) is provided with a plurality of first air inlets (4) at intervals along the length direction of the smoke hood (100). The first air inlets (4) extend along the width direction of the smoke hood (100). The inner top wall (11) is also provided with a second air inlet (5) extending along the length direction of the smoke hood (100). The second air inlet (5) is located between the front end of the first air inlet (4) along the width direction of the smoke hood (100) and the inner front wall (12). Alternatively, the upper air inlet is inclined along the width direction of the smoke hood (100).