Range hood

Abstract

The invention discloses a range hood, which comprises a smoke collecting box, a smoke outlet, a smoke outlet, a smoke outlet, a smoke outlet, a smoke outlet and a smoke outlet, wherein the front surface of the smoke collecting box is provided with a main smoke inlet; the air deflector assembly comprises air deflectors, and the air deflectors are arranged on the front side of the main smoke inlet at intervals, so that oil smoke flows to the main smoke inlet along the peripheries of the air deflectors; the air deflector assembly further comprises a turnup edge used for guiding oil flowing to the peripheral edge of the back face of the air deflector downwards, and the turnup edge is formed in a winding mode from outside to inside.

Description

Technical Field

[0001] This invention relates to an oil fume purification device, and more particularly to an oil fume extractor. Background Technology

[0002] As an essential kitchen appliance in every household, the range hood works by using a high-speed rotating impeller in the casing to draw in cooking fumes from the air inlet, filter the fumes using the impeller, and then expel the filtered fumes from the air outlet, thus purifying the kitchen air.

[0003] Commonly used side-draft range hoods typically feature a flip-up baffle to improve smoke collection. This baffle opens when the hood is operating, forming a smoke-collecting chamber. For example, Chinese Patent Application No. 202211159807.0 discloses a range hood comprising a smoke collection hood and a baffle. The baffle is movably connected to the smoke collection hood and has three states: closed, working, and cleaning. In these states, the angles formed by the baffle and the smoke collection hood are a1, a2, and a3, respectively, with a3 > a2 > a1. However, with this type of range hood, the open baffle obstructs the view, limiting the user's cooking visibility. Furthermore, the open baffle restricts the operating space during cooking, making it particularly unsuitable for tall cookware.

[0004] To address this, a range hood has been developed, such as the one disclosed in Chinese Patent Application No. 202310030720.1, which includes: a range hood housing with a base plate and a smoke inlet formed on the base plate; a fan assembly disposed within the range hood housing; and an air guide plate located outside the base plate, used to guide the fumes through the flow channel between the air guide plate and the base plate into the smoke inlet. This fixed air guide plate structure can solve the problem of the aforementioned baffle plate obstructing the view and occupying cooking space when opened; however, it generates some noise. The source of the noise is mainly related to protruding structural components inside the smoke channel, such as the oil guiding structure of the smoke inlet and decorative parts such as the panel. A common solution is to reduce the airflow velocity at the air inlet, but while reducing the airflow velocity solves the noise problem, it also reduces the smoke extraction effect to some extent.

[0005] Therefore, further improvements are needed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a range hood that reduces abrupt changes in airflow path and eliminates abnormal noise.

[0007] The technical solution adopted by the present invention to solve the above-mentioned technical problems is: a range hood, comprising: A smoke collection box, wherein the front of the smoke collection box is provided with a main smoke inlet; and An air guide plate assembly, the air guide plate assembly including air guide plates, the air guide plates being spaced apart on the front side of the main smoke inlet, so that the oil fumes flow along the outer periphery of the air guide plates to the main smoke inlet; Its features are: The air guide plate assembly also includes a flange for guiding the oil flowing to the outer periphery of the back of the air guide plate downward, the flange being rolled from the outside to the inside.

[0008] By forming a convenient shape around the back of the air guide plate, even if the oil around the air guide plate does not have time to flow to the lowest point, it can flow downwards along the flange for collection, reducing the accumulation of oil on the air guide plate assembly and the resulting dripping and hanging oil. If the flange is only a bending structure, it will cause abrupt changes in the airflow path, resulting in abnormal noise. By rolling the flange into shape, abrupt changes can be avoided, and abnormal noise can be eliminated while achieving oil guidance.

[0009] Preferably, to better avoid abrupt changes, the cross-section of the flange is annular.

[0010] Furthermore, to facilitate the setting of the main smoke inlet, the smoke collection box includes a box body with an open front side and a panel assembly set at the open front side of the box body. The panel assembly includes a panel and a panel support. The panel support is set on the side of the panel facing the inside of the box body. The panel has an opening. The panel support and the opening form a recessed platform that is recessed away from the panel. The main smoke inlet is opened on the platform.

[0011] Furthermore, the structure of the recessed platform is as follows: the recessed platform includes a bottom wall and a peripheral wall formed on the outer periphery of the bottom wall. The peripheral wall extends from the outer periphery of the bottom wall toward the panel, thereby connecting with the rest of the panel support to form an integral unit. The main smoke inlet is opened on the bottom wall.

[0012] Furthermore, to prevent oil on the sink platform from flowing outwards across the panel and remaining on the outer surface of the panel, the portion of the panel located at the outer perimeter of the opening is at least higher than the corresponding position of the peripheral wall of the sink platform at its lowest point.

[0013] Furthermore, to minimize the abrupt change in airflow path caused by the panel protruding inward from the recessed platform at the opening, the outer perimeter of the front end of the recessed platform is circular, and the outer perimeter of the opening is elliptical. The major axis of the ellipse extends along the width of the range hood, and the minor axis extends vertically along the height of the range hood. This reduces the protrusion in areas of high airflow velocity, thus reducing noise.

[0014] Preferably, the length of the major axis of the ellipse is a, the length of the minor axis of the ellipse is b, and the value of a / b is in the range of 1.019~1.025, which ensures the oil-blocking structure of the panel at the edge of the opening and minimizes abrupt changes in the airflow path.

[0015] Furthermore, due to the high flow velocity at the opening and the main smoke inlet, the boundary layer airflow is prone to separation on the sharp surface of the untreated glass, forming irregular pulsations and generating low-frequency noise. In addition, the sharp surface can cause vortex shedding, forming periodic pressure fluctuations and resulting in high-frequency noise. Therefore, the panel has a chamfer formed at the outer periphery of the opening.

[0016] Furthermore, for the panel support, the main smoke inlet is closest to the fan and has the highest flow rate. This location, where the shape changes abruptly, is prone to generating abnormal noise. Therefore, the panel support has a rounded corner structure on the outer periphery of the main smoke inlet to eliminate abnormal noise.

[0017] Furthermore, the main smoke inlet is offset upwards relative to the countertop. The centerline of the main smoke inlet along the width of the range hood is designated as the first centerline. On either side of the first centerline, the rounded corner structure has at least two different rounded corner radii, with the larger radius positioned above the smaller radius. Since the flow velocity at the main smoke inlet is higher at the top and lower at the bottom, the radius of the rounded corner structure is matched to it to better eliminate noise.

[0018] Preferably, the fillet radius is set according to the flow velocity distribution, and the ratio of the maximum fillet radius to the minimum fillet radius on either side of the first center line is in the range of 4:1 to 5:1.

[0019] Furthermore, the radius of the rounded corners is set according to the flow velocity distribution. The range hood also includes a fan installed in the smoke collection box and an air outlet hood installed at the air outlet of the fan. With the first center line as the boundary, the maximum radius of the rounded corner structure on the side closer to the air outlet hood is greater than the maximum radius of the rounded corner structure on the side farther from the air outlet hood. The flow velocity is higher on the side closer to the air outlet hood and lower on the side farther from the air outlet hood. Thus, the radius of the rounded corner structure is adapted to it to better eliminate abnormal noise.

[0020] Compared with the prior art, the advantages of the present invention are: by forming a convenient shape around the back of the air guide plate, the oil around the air guide plate can flow downward along the flange even if it does not have time to flow to the lowest point, so as to be collected, reducing the accumulation of oil on the air guide plate assembly and the resulting dripping and hanging oil. If the flange is only a bending structure, it will cause abrupt changes in the airflow path, resulting in abnormal noise. By rolling the flange into shape, abrupt changes are avoided, and abnormal noise can be eliminated while achieving oil guidance. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a range hood according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the concealed air guide plate assembly of a range hood according to an embodiment of the present invention; Figure 3This is a cross-sectional view (front and rear vertical section, with the air inlet mesh hidden) of the range hood according to an embodiment of the present invention; Figure 4 for Figure 3 A magnified schematic diagram of part I; Figure 5 This is a schematic diagram of the air guide plate assembly of a range hood according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the panel of the panel assembly of the range hood according to an embodiment of the present invention; Figure 7 This is a schematic diagram of the panel support of the panel assembly of the range hood according to an embodiment of the present invention; Figure 8 for Figure 7 A schematic diagram of the outer contour of the main smoke inlet on the panel bracket. Detailed Implementation

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0023] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0024] See Figures 1-8 A range hood includes a smoke collection box 1 and a fan 2 disposed inside the smoke collection box 1.

[0025] The smoke collection box 1 includes a box body 11 with an open front side and a panel assembly 12 disposed at the open front side of the box body 11. The upper and lower edges of the panel assembly 12 extend to the upper and lower edges of the open front side of the box body 11, respectively, thereby closing the open front side of the box body 11. A main smoke inlet 13 is provided on the front of the smoke collection box 1. Preferably, the main smoke inlet 13 is located on the panel assembly 12 and at the center of the panel assembly 12 along the width direction of the range hood. The width direction of the range hood refers to the left-right direction when the user faces the range hood in its normal installation state. (See [reference needed]). Figure 1 As indicated by arrow X. The front of the smoke collection box 1 refers to the side of the range hood facing the user when it is in normal operating condition.

[0026] The panel assembly 12 includes a panel 121 and a panel bracket 122. The panel 121 is generally made of glass, which is easier to clean and maintain. The panel bracket 122 is located on the side of the panel 121 facing the inside of the housing 11. The panel 121 has an opening 123, and the panel bracket 122 forms a recessed platform 124 at the corresponding position of the opening 123, which is recessed away from the panel 121 (i.e., towards the inside of the housing 11).

[0027] The recessed platform 124 includes a bottom wall 1241 and a peripheral wall 1242 formed on the outer periphery of the bottom wall 1241. The peripheral wall 1242 extends from the outer periphery of the bottom wall 1241 toward the panel 121 until it reaches the outer periphery of the opening 123, thereby connecting integrally with the rest of the panel support 122. The aforementioned main smoke inlet 13 is formed on the bottom wall 1241, and its preferred cross-section is also circular, where the cross-section refers to the cross-section along the thickness direction of the bottom wall 1241. The main smoke inlet 13 is smaller than the opening 123. The peripheral wall 1242 is provided with secondary smoke inlets 14, which may be arc-shaped in general, and there are multiple secondary smoke inlets 14, which are arranged at intervals along the circumference of the peripheral wall 1242, thereby surrounding the outer periphery of the main smoke inlet 13. In this embodiment, there are six secondary smoke inlets 14, which can almost completely surround the outer periphery of the main smoke inlet 13. Optionally, the number or size of the secondary smoke inlets 14 can also be set as needed, so that they only partially surround the outer periphery of the main smoke inlet 13.

[0028] To prevent oil on the recessed platform 124 from flowing out of the panel 121, the outer periphery of the opening 123 on the panel 121 is typically located inside the outer periphery of the recessed platform 124. That is, the size of the opening 123 is smaller than the size of the area where the peripheral wall 1242 of the recessed platform 124 is in contact with the panel 121. Specifically, this ensures that the lowest edge of the panel 121 at the opening 123 is higher than the corresponding position of the peripheral wall 1242 of the recessed platform 124, preventing oil from flowing over the panel 121. Thus, the portion of the panel 121 at the outer periphery of the opening 123 forms a ring-shaped oil-blocking structure. Since this oil-blocking structure is a raised structure, it can also generate whistling noise from the airflow. Therefore, in this embodiment, the outer periphery of the opening 123 is designed as an ellipse, reducing the protrusion in areas of high airflow velocity, thereby reducing noise. See also... Figure 6The major axis of the ellipse extends along the width of the range hood, with a length of 'a'. The outer perimeter of the recessed platform 124 where its peripheral wall 1242 is in contact with the panel 121 (i.e., the front end of the peripheral wall 1242) is circular, and 'a' is the same as the diameter of this circle. Here, the oil flows downwards naturally due to gravity, and no oil-blocking structure is needed. The minor axis of the ellipse extends vertically along the height of the range hood, with a length of 'b', where 'a' > 'b', and the value of 'a / b' is within the range of 1.019 to 1.025.

[0029] Because the flow velocity at opening 123 and the main smoke inlet 13 is relatively high, reaching 10 m / s, the boundary layer airflow is prone to separation on the sharp surface of the untreated glass, forming irregular pulsations and generating low-frequency noise (100-4000 Hz). Furthermore, the sharp surface can trigger vortex shedding, creating periodic pressure fluctuations and resulting in high-frequency noise. Therefore, the outer perimeter of panel 121 at opening 123 is chamfered to form chamfer 1231. The chamfer size is controlled within the range that glass can be processed, i.e., a radius between 2 and 2.5 mm (normal glass chamfer is 1 mm). Chamfering significantly reduces abnormal noise.

[0030] The fan 2 is housed within the casing 11 and has a first air inlet 21 facing the front of the range hood and a second air inlet 22 facing the rear of the range hood. An air inlet mesh 23 can be installed at the first air inlet 21 for filtration and rectification. The smoke collection box 1 also includes an air guide ring 15, which is a complete ring or arc shape. The front end of the air guide ring 15 is closely attached to the outer periphery of the main smoke inlet 13, and the rear end of the air guide ring 15 is closely attached to the outer periphery of the first air inlet 21. Thus, the first air inlet 21 is only in fluid communication with the main smoke inlet 13, and the fumes entering from the main smoke inlet 13 can only enter the first air inlet 21, which constitutes the main smoke intake channel. Fumes entering the casing 11 from the secondary smoke inlet 14 flow to the rear of the casing 11 and enter the fan 2 through the second air inlet 22, which constitutes the secondary smoke intake channel.

[0031] Therefore, the main smoke inlet channel and the secondary smoke inlet channel are separated by the main smoke inlet 13, the secondary smoke inlet 14 and the guide ring 15, so that the oil fume airflow is diverted in front, avoiding a series of problems caused by the diversion of the oil fume airflow after it enters the air duct of the range hood, and ensuring that the airflow will not interfere with each other in the oil fume channel to form turbulence, turbulence and chaotic flow.

[0032] For the panel bracket 122, the main smoke inlet 13 is closest to the fan 2 and has the highest flow rate. This location is abrupt in shape and is prone to generating abnormal noise. Therefore, the panel bracket 122 has a rounded corner structure 126 on the outer periphery of the main smoke inlet 13 to eliminate abnormal noise.

[0033] The range hood also includes an air guide plate assembly 3, which includes air guide plates 31 spaced apart on the front side of the opening 123. This allows cooking fumes to enter the opening 123 along the outer periphery of the air guide plates 31, forming a 360° circumferential suction. In this embodiment, the air guide plates 31 are approximately circular, and their dimensions are adapted to the opening 123, i.e., substantially the same. Along the width direction of the range hood, one side of the air guide plates 31 can be rotatably connected to the panel assembly 12, while the opposite side is detachably connected to the panel assembly 12, preferably via a snap-fit ​​32. This allows the air guide plate assembly 3 to be easily opened for cleaning of the back of the air guide plates 31 and the panel assembly 12.

[0034] After prolonged cooking, the oil on the air guide plate 31 may not have enough time to flow to its lowest point and will instead drip or sag along the sides, making cleaning difficult. To address this, a flange 33 is formed on the outer periphery of the back side of the air guide plate 31 (the side facing the main smoke inlet 13). If the flange 33 were simply a bent structure, it would produce noise. Therefore, in this embodiment, the flange 33 is formed by rolling from the outside in (from the outer periphery inwards), and its cross-section (the cross-section coinciding with or parallel to the axial direction of the air guide plate 31) is annular. Due to manufacturing limitations, this annular shape may have a partial gap at the end instead of being a closed loop. This rolled shape is more regular, without abrupt changes in shape, reducing abrupt changes in the airflow path and eliminating noise while effectively guiding oil. The starting point of the flange 33 can be approximately located in the middle of the height direction of the air guide plate 31, and the ending point of the flange 33 is preferably located at the bottom of the air guide plate 31. Preferably, there are two flanges 33, which are formed on both sides of the air guide plate 31 along the width direction of the range hood and are arranged symmetrically. The flanges 33 are used to collect oil. The oil on the air guide plate 31 will flow down from the top due to gravity. Due to the presence of the flanges 33, the oil will be collected along the flanges 33 to the bottom of the back plate 32.

[0035] The air guide plate assembly 3 also includes an oil receiving component 34. The oil receiving component 33 is located at the bottom of the air guide plate 31, and in a horizontal projection, the end point projection of the flange 33 falls within the projection of the oil receiving component 33. Therefore, the oil receiving component 34 can completely collect the oil flowing down along the flange 33, and also collect the oil flowing directly down along the air guide plate 31 to the bottom. The oil receiving component 34 guides the oil flowing down from the air guide plate 31 and flange 33 to the recessed platform 124 of the panel assembly 12. An oil drain hole 125 can be provided at the bottom of the recessed platform 124, allowing the oil guided by the oil receiving component 34 to enter the smoke collection box 1.

[0036] The front end of the peripheral wall 1242 of the recessed platform 124 can be symmetrically arranged along both the width and vertical directions of the range hood to accommodate double-burner cooktops. The main smoke inlet 13 is offset relative to the recessed platform 124 along the width direction of the range hood to match the first air inlet 21 of the fan 2 (usually the installation position of the fan 2 is limited by the installation of the air outlet hood 5 at its outlet). In this embodiment, it is offset to the right. The main smoke inlet 13 is offset upward relative to the recessed platform 124. When the oil fume airflow enters the main smoke inlet 13 along the outer periphery of the guide plate 31, the resistance at the bottom is greater than the resistance at the top (airflow path is larger at the bottom and smaller at the top), and the flow velocity is larger at the top and smaller at the bottom. Therefore, the rounded corner radii of the rounded corner structure 126 are not all the same. See Figure 7 and Figure 8 Where X1 represents the center line of the main smoke inlet 13 in the width direction of the range hood (denoted as the first center line X1), and X2 represents the center line of the main smoke inlet 13 in the vertical direction (denoted as the second center line X2). On both sides of the first center line X1, the following conditions must be met: the rounded corner structure 126 has at least two different rounded corner radii, and the part with the larger rounded corner radius is located above the part with the smaller rounded corner radius. For any side of the first center line X1, the ratio of the maximum rounded corner radius to the minimum rounded corner radius ranges from 4:1 to 5:1. In this embodiment, the rounded corner structure 126 located to the left of the first center line X1 is divided into four equal parts, with rounded corner radii of R3, R5, R9, and R14 (in mm) from bottom to top. The rounded corner structure located to the right of the first center line X1 is divided into three equal parts, with rounded corner radii of R3, R6, and R12 (in mm) from bottom to top. Furthermore, taking the first center line X1 as the boundary, the maximum radius of the rounded corner structure 126 on the side closer to the air outlet hood 5 is greater than the maximum radius of the rounded corner structure 126 on the side farther from the air outlet hood 5.

[0037] Since the air guide plate assembly 3 in this invention is fixedly installed when the range hood is working, there is no problem of obstructing the view or restricting the cooking space. Using this air guide plate assembly 3, the cooking visibility is good and the cooking operation space is large. However, its smoke collection ability is limited. Therefore, baffles 16 are respectively provided on both sides of the housing 11 along the width direction of the range hood. The baffles 16 extend forward from the front edge of the housing 11, thus extending forward beyond the panel assembly 12. The baffles 16 can isolate the oil fumes on both sides, preventing the oil fumes from escaping to the sides, and also prevent the surrounding airflow from affecting the smoke intake, improving the anti-interference ability of the range hood in smoke extraction and exhaust. Preferably, each baffle 16 can be gradually tilted from back to front towards the direction of another baffle 16 to guide and gather the oil fumes to the air guide plate assembly 3.

[0038] The top of the housing 11 also extends forward beyond the panel assembly 12. Thus, the portion of the top of the housing 11 that extends beyond the panel assembly 12 constitutes the top smoke collection part 112. At the same time, the top smoke collection part 112 also isolates the influence of the top airflow on the smoke entering the middle of the range hood, thereby improving the range hood's anti-interference ability.

[0039] By using the side baffles 16 and the top smoke collection part 112, combined with the central ring suction smoke intake, the range hood achieves full ring suction of the oil fume airflow, enabling good smoke extraction even without the rotating baffles of a side-suction range hood. The overall front-to-back dimensions are controlled within 400mm, reducing the risk of bumping your head.

[0040] The aforementioned fan 2 can be controlled by a voice module. A controller, a voice receiving module, and a voice parsing module can be installed on the range hood. The voice receiving module receives user commands, and the voice parsing module parses the commands. Based on the parsed commands, the controller controls the fan 2 to perform corresponding operations, thereby realizing intelligent control of the range hood and improving the user experience.

[0041] The term "fluid connectivity" as used in this invention refers to the spatial relationship between two components or parts (hereinafter referred to as the first part and the second part, respectively), that is, a fluid (gas, liquid, or a mixture of both) can flow from the first part along a flow path and / or be transported to the second part. This can be a direct connection between the first part and the second part, or an indirect connection between the first part and the second part through at least one third party. This third party can be a fluid channel such as a pipe, channel, conduit, air guide ring, hole, groove, or a chamber that allows fluid to flow through, or a combination of the above.

Claims

1. A range hood, comprising: a hood (1), a front side of the hood (1) being provided with a main smoke inlet (13); and a baffle assembly (3) comprising a baffle (31) arranged at a front side of the main smoke inlet (13) in a spaced-apart manner so that flue gas flows along an outer periphery of the baffle (31) to the main smoke inlet (13); characterized in that: the baffle assembly (3) further comprises a turned-up edge (33) for guiding oil flowing to an outer peripheral edge at a back side of the baffle (31) downward, the turned-up edge (33) being formed by being rolled up from outside to inside. a cross section of the turned-up edge (33) is in the shape of a circular ring.

2. The hood according to claim 1, characterized in that: the hood (1) comprises a box body (11) with an open front side and a panel assembly (12) provided at the open front side of the box body (11), the panel assembly (12) comprising a panel (121) and a panel support (122) provided at a side of the panel (121) facing the inside of the box body (11), the panel (121) being provided with an opening (123), the panel support (122) and the opening (123) corresponding positions forming a sunken platform (124) recessed in a direction away from the panel (121), the main smoke inlet (13) being formed on the sunken platform (124).

3. The hood according to claim 1, characterized in that: the sunken platform (124) comprises a bottom wall (1241) and a peripheral wall (1242) formed at an outer periphery of the bottom wall (1241), the peripheral wall (1242) extending from the outer periphery of the bottom wall (1241) in a direction towards the panel (121) so as to be connected integrally with the rest of the panel support (122), the main smoke inlet (13) being formed on the bottom wall (1241).

4. The hood according to claim 3, characterized in that: a portion of the panel (121) at an outer peripheral edge of the opening (123) is at least higher than a corresponding position of the peripheral wall (1242) of the sunken platform (124) at the lowest point.

5. The hood according to claim 4, characterized in that: an outer peripheral edge of a front side end of the peripheral wall (1242) of the sunken platform (124) is circular, and an outer peripheral edge of the opening (123) is elliptical, with a major axis of the ellipse extending in a width direction of the range hood and a minor axis of the ellipse extending up and down in a height direction of the range hood.

6. The hood according to claim 5, characterized in that: a length of the major axis of the ellipse is a, a length of the minor axis of the ellipse is b, and a value of a / b is in a range of 1.019-1.

025.

7. The hood according to claim 6, characterized in that: the panel (121) forms a chamfer (1231) at an outer peripheral edge of the opening (123).

8. The hood according to claim 3, characterized in that: the panel support (122) is provided with a round corner structure (126) at an outer peripheral edge of the main smoke inlet (13).

9. The hood according to claim 3, characterized in that: the main smoke inlet (13) is upwardly offset relative to the sunken platform (124), a center line of the main smoke inlet (13) in a width direction of the range hood is denoted as a first center line (X1), and on both sides of the first center line (X1), there are at least two different radii of the round corner structure (126), and a portion with a larger radius of the round corner structure (126) is located above a portion with a smaller radius of the round corner structure (126).

10. The hood according to claim 9, characterized in that: on either side of the first center line (X1), a ratio of a maximum radius of the round corner structure (126) to a minimum radius of the round corner structure (126) is in a range of 4:1-5:

1.

11. The hood according to claim 10, characterized in that: ​ 12. The hood according to claim 10, characterized in that: The range hood further comprises a fan (2) arranged in the smoke collecting box (1) and an air outlet cover (5) arranged at the air outlet of the fan (2), and the maximum fillet radius of the fillet structure (126) near the side of the air outlet cover (5) is greater than the maximum fillet radius of the fillet structure (126) away from the side of the air outlet cover (5) with the first center line (X1) as the boundary.

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