Range hood

Abstract

The utility model relates to a kind of range hood, comprising: fan frame, its inside is equipped with fan system;Smoke collecting hood is connected in the bottom of fan frame, and with the internal space of fan frame is communicated, the front portion of smoke collecting hood has air inlet;The inside of the smoke collecting hood defines vertically extending air inlet chamber, air inlet chamber has the left and right opposite noise reduction board assembly, the interval between the left and right two noise reduction board assembly gradually decreases from bottom to top, two noise reduction board assembly and the front and rear side wall of the smoke collecting hood define air inlet air duct, the air inlet air duct is also equipped with grid assembly for the airflow passing through is rectified.Occupational advantage is that: left and right noise reduction board assembly form smooth taper flow channel, reduce airflow in combination portion (especially top side) Acceleration separation and vortex generation, reduce noise from the source.On this basis, grid assembly carries out secondary rectification to airflow in air inlet air duct, suppresses turbulent flow pulsation and vortex shedding, avoids abnormal sound.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a low-noise, thin range hood. Background Technology

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. Due to space limitations in kitchens, ultra-thin range hoods with minimal front-to-back depth have emerged. However, as users' demands for noise reduction increase, they prefer lower noise levels while maintaining adequate airflow. Traditional ultra-thin range hoods have their fan system located at the bottom within the smoke collection chamber. This design places the noise source directly at the user, resulting in relatively high noise levels. Furthermore, due to space constraints and ultra-thin dimensions, there is no airflow guiding structure, and the grille is very close to the fan inlet, easily causing turbulent airflow and resulting in varying degrees of abnormal noise.

[0003] Chinese utility model patent application CN202221634004.1 discloses a flow guiding component for an ultra-thin wall-mounted range hood, including a range hood body and a smoke collection hood disposed on the range hood body. An air inlet is provided on the smoke collection hood, and a flap is hinged at the air inlet to open and close the air inlet. The component also includes a flow guide plate, with its two sides connected to the two side walls of the smoke collection hood, its upper end connected to the rear wall of the smoke collection hood, and its lower end inclined downwards from back to front, with the lower end of the flow guide plate connected to the front wall of the smoke collection hood after being inclined. A partition is disposed on the flow guide plate to divide the internal space of the smoke collection hood into two smoke exhaust channels. By incorporating a flow guide plate inside the range hood, the generation of turbulence and eddies inside the smoke collection hood is reduced, resulting in smoother airflow and reduced overall airflow noise.

[0004] While the aforementioned patent application improved the noise problem of thin-type smoke hoods to some extent by setting up a flow guiding component, it still has certain shortcomings: the width of the smoke hood is usually greater than the width of the fan frame (upper housing) above it, and the flow guiding plate in the aforementioned patent application is only set at the bottom of the air inlet of the smoke hood, failing to effectively solve the problem of the abrupt change in size between the top of the smoke hood and the narrower fan frame inlet. When the airflow flows from the wide smoke hood to the relatively narrow fan inlet, severe airflow contraction, separation, and vortices are easily generated at the joint (especially in the areas on both sides of the top of the smoke hood), which is a significant source of noise. In other words, the flow guiding plate of the existing technology mainly acts on the bottom of the smoke hood cavity, but lacks an effective rectification structure for the transition area near the fan inlet at the top of the smoke hood and the lateral cavity at the junction of the smoke hood and the fan frame. These areas are precisely the "disaster areas" where airflow acceleration, direction change, and turbulence and vortices are easily generated, and have not been fully optimized. Especially when the fan is running at high speed (high gear), the air volume and airflow velocity increase significantly. Existing airflow guiding structures cannot adequately suppress the strong vortex shedding, airflow impact, and turbulent pulsation generated by high-speed airflow at abrupt size changes and in complex cavities. As a result, abnormal noises (such as howling and buzzing) are still noticeable at high speeds, and the noise reduction effect is greatly reduced under high loads.

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

[0006] The technical problem to be solved by this utility model is to provide a range hood with good noise reduction effect, based on the current state of the technology.

[0007] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a range hood, comprising:

[0008] The fan frame contains the fan system.

[0009] A smoke hood is connected to the bottom of the fan frame and communicates with the internal space of the fan frame. The front of the smoke hood has an air inlet.

[0010] The interior of the smoke hood defines a vertically extending air inlet chamber, which contains two opposing noise reduction plate assemblies. The distance between the two noise reduction plate assemblies gradually decreases from bottom to top. The two noise reduction plate assemblies and the front and rear side walls of the smoke hood define an air inlet duct. The air inlet duct is also provided with a grille assembly for rectifying the airflow.

[0011] The range hood features two sets of noise-reducing panels arranged in the air intake chamber. The distance between these panels gradually decreases from bottom to top, forming a smooth, tapering flow channel. This effectively mitigates the abrupt change in size between the wide smoke hood and the narrow fan inlet, reducing accelerated separation and vortex generation of airflow at the junction (especially on the top and sides), thus lowering noise at its source. Furthermore, the grille assembly performs secondary airflow rectification within the air intake duct, suppressing turbulent pulsations and vortex shedding to prevent abnormal noises (such as whistling). Simultaneously, the noise-reducing panels and the front and rear side walls define the air intake duct, ensuring smooth airflow and reducing turbulent energy loss. The tapering structure of the air intake duct, combined with the grille, maintains stable airflow even at high speeds (high settings), suppressing high-speed impacts and vortices, significantly reducing noise intensity, and resulting in a significantly improved noise reduction effect compared to existing technologies.

[0012] As an improvement, the top of the smoke hood has a connection port for connecting to the bottom of the fan frame. On the left side of the smoke hood, the noise reduction plate assembly extends upwards at an angle from the bottom left side of the smoke hood to the left edge of the connection port. On the right side of the smoke hood, the noise reduction plate assembly extends upwards at an angle from the bottom right side of the smoke hood to the right edge of the connection port. The noise reduction plate assembly extends obliquely to the edge of the connection port, forming a smooth transition airflow channel and reducing airflow resistance. Furthermore, it also prevents airflow from impacting the top of the smoke hood, reducing noise and energy loss.

[0013] To ensure noise reduction effect and simplify the structure of the noise reduction panel assembly, the noise reduction panel assembly includes a noise reduction panel and a sound-absorbing component disposed on the back of the noise reduction panel, and the noise reduction panel has noise reduction holes distributed in local areas.

[0014] To accommodate the main air inlet at the bottom (especially considering that a deflector plate is often required at the main air inlet), the noise reduction plate includes a vertically extending section and an inclined section extending from the top of the vertical section downwards towards the middle of the smoke hood. The air inlet includes a main air inlet, which is arranged adjacent to the vertical section of the noise reduction plate. The sound-absorbing component is arranged on the back of the inclined section of the noise reduction plate.

[0015] As an improvement, the grille assembly is connected between the left and right noise reduction plate assemblies, and the grille assembly is inclined upwards from back to front. The backward-inclined grille guides the airflow upwards, reducing backflow and improving airflow efficiency. On the other hand, it also facilitates the diversion of oil towards the rear wall of the smoke hood.

[0016] As an improvement, the illustrated grille assembly includes an upper oil mesh grille and a lower grid grille, with air inlets distributed on the oil mesh grille. The lower grid grille can initially rectify the airflow and reduce turbulence. The upper oil mesh grille (with air inlets) can perform secondary rectification, and also facilitates the collection and guidance of dripping oil from above.

[0017] To ensure effective fume extraction, the fume hood features a vertically extending panel support at its front. The air inlet includes a main air inlet located at the lower part of the panel support and an auxiliary air inlet located at the upper part. The lower main air inlet can extract and exhaust regular fumes; the upper auxiliary air inlet supplements suction when the amount of fumes is large, capturing fumes that the main air inlet cannot extract in time, preventing escape.

[0018] Considering that a straight air inlet edge would cause fumes to spread to both sides, the main air inlet extends horizontally, and its top edge slopes upwards from both sides to the center, thus forming an inverted V-shape. This inverted V-shaped top edge guides fumes from both sides towards the center, expanding the negative pressure coverage and improving the fume extraction efficiency.

[0019] To better guide the oil and prevent it from dripping from the edge of the main air inlet, the main air inlet has a first oil-guiding flange at at least its top edge or left and right side edges, which bends and extends inward toward the inside of the fume hood. This first oil-guiding flange, especially in conjunction with the aforementioned inverted V-shaped top edge structure, can guide oil droplets to the left and right sides, preventing oil from passing through the main air inlet and dripping to the outside.

[0020] To better capture and exhaust cooking fumes, especially to match the conventional left and right cooking zones of the stove, at least two auxiliary air inlets are arranged sequentially on the left and right sides. The two or more auxiliary air inlets evenly distribute the air pressure, improving the efficiency of fume capture at the top.

[0021] As an improvement, a panel disposed on the top front side of the smoke hood is also included, which has at least a first state and a second state as its position changes with rotation:

[0022] In the first state, the panel covers the front of the smoke hood, and the lower edge of the panel extends to the bottom of the smoke hood, thereby blocking the main air inlet and the auxiliary air inlet together.

[0023] In the second state, the panel is tilted forward and opened relative to the smoke hood, exposing the main air inlet and the auxiliary air inlet.

[0024] The aforementioned panel is made of a single piece of glass, with the opening and closing mechanism located at the top of the fume hood rather than in the middle. This design effectively avoids the oil fume leakage problem that would occur if the panel were located in the middle, and also does not affect the smooth flow of oil fumes. The large panel design allows for effective collection of oil fumes when opened, reducing escape.

[0025] Considering the limited front-to-back dimensions of a slim range hood, a partial rearward recess forms a smoke buffer chamber on the front side of the panel support to further reduce smoke escape. The left-to-right dimensions of at least the upper region of this smoke buffer chamber gradually decrease from bottom to top. Both the main air inlet and the auxiliary air inlet are located within this smoke buffer chamber area. When a large amount of smoke rises rapidly during cooking, it may not be possible to draw all the smoke in immediately. In this case, some of the smoke can enter the smoke buffer chamber area and be drawn out through the upper auxiliary air inlet, effectively preventing smoke escape caused by a large volume of smoke in a short period.

[0026] To facilitate connection with the outer perimeter of the front part of the fume hood, at least the top edge and the left and right side edges of the panel bracket protrude forward relative to the main body of the panel bracket. The structural design of the forward-protruding top edge and left and right side edges of the panel bracket also causes the main body of the panel bracket to be relatively recessed, thereby forming a secondary buffer zone and further improving the problem of oil fume escape.

[0027] In order to guide the flue gas at the main air inlet and reduce the noise caused by airflow turbulence, a guide plate is also provided at the main air inlet of the panel bracket. The guide plate extends obliquely upward and backward from the lower edge of the main air inlet.

[0028] Compared with existing technologies, the advantages of this invention are as follows: The two sets of noise-reducing plate assemblies installed in the air intake chamber of the range hood have a gradually decreasing distance between them from bottom to top, forming a smooth, tapering flow channel. This effectively mitigates the abrupt change in size from the wide smoke hood to the narrow fan inlet, reducing accelerated separation and vortex generation of airflow at the junction (especially on the top sides), thus reducing noise at its source. Furthermore, the grille assembly performs secondary rectification of the airflow in the air intake duct, suppressing turbulent pulsations and vortex shedding, preventing abnormal noises (such as whistling). Simultaneously, the noise-reducing plate assemblies and the front and rear side walls define the air intake duct, ensuring smooth airflow and reducing turbulent energy loss. The tapering structure of the air intake duct, combined with the grille, maintains stable airflow even at high speeds (high settings), suppressing high-speed impacts and vortices, significantly reducing noise intensity, and resulting in a significantly improved noise reduction effect compared to existing technologies. Attached Figure Description

[0029] Figure 1 This is a three-dimensional structural diagram of the range hood according to an embodiment of the present utility model;

[0030] Figure 2 This is a vertical sectional view of the range hood of this utility model, cut along the front-to-back direction;

[0031] Figure 3 This is a vertical sectional view of the range hood of this utility model, cut along the left-right direction;

[0032] Figure 4 This is a three-dimensional structural diagram of the range hood according to an embodiment of the present utility model, with the panel removed.

[0033] Figure 5 This is a three-dimensional structural diagram of the front of the panel bracket according to an embodiment of the present utility model;

[0034] Figure 6 This is a three-dimensional structural diagram of the back of the panel bracket according to an embodiment of the present utility model. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0036] In the specification and claims of this utility model, terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," are used to describe various exemplary structural parts and elements of this utility model. However, the use of these terms is merely for the purpose of explanation and is based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this utility model can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0037] Figures 1-6 This illustration shows a preferred embodiment of the range hood of this utility model. The range hood includes a housing and a fan system 11 disposed within the housing. The housing generally includes a fan frame 10 and a smoke collection hood 20 disposed at the bottom of the fan frame 10, with the inner cavity of the fan frame 10 communicating with the inner cavity of the smoke collection hood 20. An air inlet is provided on the front side wall of the smoke collection hood 20, allowing external fumes to enter the smoke collection hood 20 through the air inlet. The fan system 11 is generally a centrifugal fan, disposed within the fan frame 10. When the centrifugal fan operates, it generates negative pressure, allowing external fumes to be drawn into the smoke collection hood 20 through the air inlet. An oil cup is provided at the bottom of the smoke collection hood 20, which is a long strip extending laterally to collect oil stains flowing down from the smoke collection hood 20. The front of the smoke hood 20 is also provided with a panel 60 that can deflect back and forth relative to the smoke hood 20. The panel 60 is connected to the main body of the smoke hood 20 through a hinge mechanism. Specifically, it can deflect forward to open the air inlet and deflect backward to block and close the air inlet. The hinge mechanism used to drive the smoke baffle to deflect can be a conventional hinge mechanism in the prior art, which will not be described in detail here.

[0038] See 2- Figure 4In this embodiment, the front and rear depths of the fume hood 20 are basically the same, meaning that when the panel 60 is in the closed state, it is essentially vertically extending. Therefore, the air inlet chamber defined within the fume hood 20 is also essentially a vertically extending chamber structure. The left and right dimensions of the fume hood 20 are larger than the left and right dimensions of the fan frame 10. Thus, the left and right sides of the fume hood 20 have shoulders protruding to the left or right relative to the fan frame 10, respectively. The top of the fume hood 20 has a connection port 22 that communicates with the bottom of the fan frame 10, allowing the vertical air inlet chamber formed inside the fume hood 20 to communicate with the inner cavity of the fan frame 10. The front of the fume hood 20 has a panel support 50, with a main air inlet 51 at the bottom and an auxiliary air inlet 52 at the top for drawing in fumes. When the panel 60, which can be tilted back and forth, is tilted back into position, it can cover the panel support 50, thus simultaneously closing the main air inlet 51 and the auxiliary air inlet 52.

[0039] In this embodiment, the panel 60 has at least two states depending on its rotation position: In the first state, the panel 60 covers the front of the fume hood 20, and its lower edge extends to the bottom of the fume hood 20, thus blocking both the main air inlet 51 and the auxiliary air inlet 52; in the second state, the panel 60 is tilted forward relative to the fume hood 20 and opened, exposing the main air inlet 51 and the auxiliary air inlet 52. The panel 60 is a single piece of glass, with its opening and closing mechanism located at the top of the fume hood 20 rather than in the middle. This design effectively avoids the problem of oil fume leakage when the panel 60 is located in the middle area, and also does not affect the smoothness of the oil fume intake or flow field. The large panel 60 design allows for effective collection of oil fumes when opened, reducing escape.

[0040] See Figures 4-6 In some embodiments, the front side of the panel support 50 is partially recessed to form a flue gas buffer chamber 53, the upper left and right dimensions of which gradually decrease from bottom to top, forming an inverted V-shaped flue gas buffer space. The bottom of the flue gas buffer chamber 53 extends left and right to the left and right edges of the panel support 50. The main air inlet 51 and auxiliary air inlet 52 mentioned above are both located in the area of ​​the flue gas buffer chamber 53. The left and right dimensions of the main air inlet 51 are basically the same as the left and right dimensions of the flue gas buffer chamber 53, that is, it also extends left and right to the left and right edges of the panel support 50. There are two auxiliary air inlets 52 arranged left and right at intervals, each auxiliary air inlet 52 is a strip-shaped opening extending left and right, and the two auxiliary air inlets 52 correspond to the dual-burner cooking area, enhancing the efficiency of top oil fume capture. During cooking, a large amount of oil fumes can be temporarily stored in the buffer chamber. The oil fumes that the main air inlet 51 cannot exhaust in time are guided to the auxiliary air inlet 52 by the tapering structure and are drawn in through the upper auxiliary air inlet 52 to prevent escape.

[0041] The top and left and right side edges 500 of the panel bracket 50 protrude forward, forming a support when closed with the panel 60. The forward-protruding structure of the top and left and right side edges of the panel bracket 50 also causes the main body of the panel bracket 50 to be recessed backward, forming a secondary buffer cavity to enhance the buffering effect.

[0042] In this embodiment, the main air inlet 51 on the panel bracket 50 has an inverted V-shaped top edge, that is, it tilts upward from the left and right sides towards the middle. In this way, as the flue gas flows from the outside to the inside through the main air inlet 51, it gradually gathers towards the middle. Since the opening area of ​​the main air inlet 51 gradually increases from the sides towards the middle, according to Bernoulli's principle, the pressure is lower where the airflow velocity is higher. Therefore, the airflow on the upper side of the left and right sides of the main air inlet 51 also gathers towards the middle, forming a rotating trapping cyclone, so that the fumes can be better drawn in and prevent the fumes from escaping from the sides.

[0043] The top edge and left and right side edges of the main air inlet 51 bend and extend into the smoke hood 20 to form the first oil-guiding flange 511, preventing oil droplets from overflowing. Based on the inverted V-shaped top edge structure of the main air inlet 51, the first oil-guiding flange 511 is provided to guide oil droplets to the left and right sides, and finally flow down from the side, preventing oil from dripping directly from the top edge.

[0044] In this embodiment, the smoke hood 20 is also provided with a guide plate 54 at the main air inlet 51. The bottom edge of the guide plate 54 is connected to the lower edge of the main air inlet 51. The guide plate 54 extends backward and upward as a whole to guide the airflow smoothly into the chamber and reduce the inlet turbulence noise.

[0045] In some embodiments, the smoke hood 20 is further provided with symmetrical noise reduction plate assemblies in its air inlet chamber. The left noise reduction plate assembly extends upward at an angle from the bottom left side of the smoke hood 20 to the left edge of the top connection port 22. The right noise reduction plate assembly extends upward at an angle from the bottom right side of the smoke hood 20 to the right edge of the connection port 22. The distance between the left and right noise reduction plate assemblies gradually decreases from bottom to top, forming a smoothly tapering flow channel. This tapering flow channel connects the smoke hood 20 to the inlet of the fan frame 10, eliminating abrupt changes in size and suppressing vortex and separation noise generated by the airflow on both sides of the top.

[0046] Each noise reduction panel assembly includes a noise reduction panel 31 and a sound-absorbing component 32 disposed on the back of the noise reduction panel 31. The noise reduction panel 31 includes a vertical section 311 (near the side wall of the smoke hood 20) and an inclined section 312 (extending inclinedly from the top of the vertical section 311 towards the middle of the smoke hood 20). The sound-absorbing component 32 is attached to the back of the inclined section 312 of the noise reduction panel 31 and is made of porous sound-absorbing cotton material. The noise reduction holes 310 on the noise reduction panel 31 are mainly distributed in a local area of ​​the vertical section 311 of the noise reduction panel 31.

[0047] In some embodiments, the tapered air inlet duct 21 is further provided with a grille assembly 40. Specifically, the grille assembly 40 is laterally connected between the left and right noise reduction plate assemblies, and is inclined from back to front and upward. The grille assembly 40 adopts a double-layer grille structure, wherein the lower layer is a grid grille 42, which is composed of parallel grid bars, to initially rectify the airflow and reduce turbulence. The upper layer is an oil mesh grille 41, which covers the grid grille 42 and has dense air inlet holes 410 on its surface to further rectify the airflow and collect oil droplets. The grille assembly 40 is designed with an overall inclination, which can guide the airflow upward to converge, while guiding the oil to the rear side wall of the smoke hood 20 to prevent oil droplets from passing through the grille.

[0048] In this embodiment, the range hood features two sets of noise-reducing plate assemblies arranged in the air inlet chamber. The distance between the left and right noise-reducing plate assemblies gradually decreases from bottom to top, forming a smooth, tapering flow channel. This effectively mitigates the abrupt change in size from the smoke collection hood 20 (wide) to the fan inlet (narrow), reducing the accelerated separation and vortex generation of airflow at the junction (especially on the top and sides), thus reducing noise at the source. Furthermore, the grille assembly 40 performs secondary rectification of the airflow in the air inlet duct 21, suppressing turbulent pulsations and vortex shedding, and preventing abnormal noises (such as whistling). Simultaneously, the noise-reducing plate assemblies and the front and rear side walls define the air inlet duct, ensuring smooth airflow and reducing turbulent energy loss. The tapering structure of the air inlet duct 21, combined with the grille, maintains stable airflow even at high speeds (high gears) and increased air volume, suppressing high-speed impacts and vortices, significantly reducing noise intensity, and resulting in a significantly improved noise reduction effect compared to existing technologies.

Claims

1. A range hood, comprising: A fan frame (10) is provided with a fan system (11) inside; A smoke hood (20) is connected to the bottom of the fan frame (10) and communicates with the internal space of the fan frame (10). The front of the smoke hood (20) has an air inlet. The feature is that: the interior of the smoke hood (20) defines a vertically extending air inlet chamber, the air inlet chamber has left and right opposite noise reduction plate assemblies, the distance between the left and right noise reduction plate assemblies gradually decreases from bottom to top, the two noise reduction plate assemblies and the front and rear side walls of the smoke hood (20) define an air inlet duct (21), and the air inlet duct (21) is also provided with a grille assembly (40) for rectifying the passing airflow.

2. The range hood according to claim 1, characterized in that: The top of the smoke hood (20) has a connection port (22) for connecting to the bottom of the fan frame (10). The noise reduction plate assembly is located on the left side of the smoke hood (20) and extends upward from the bottom left side of the smoke hood (20) to the left edge of the connection port (22). The noise reduction plate assembly is located on the right side of the smoke hood (20) and extends upward from the bottom right side of the smoke hood (20) to the right edge of the connection port (22).

3. The range hood according to claim 2, characterized in that: The noise reduction plate assembly includes a noise reduction plate (31) and a sound-absorbing component (32) disposed on the back of the noise reduction plate (31). The noise reduction plate (31) has noise reduction holes (310) distributed in a local area.

4. The range hood according to claim 3, characterized in that: The noise reduction plate (31) includes a vertically extending vertical section and an inclined section (312) extending from the top of the vertical section (311) downwards toward the middle of the smoke hood (20). The air inlet includes a main air inlet (51), which is arranged adjacent to the vertical section (311) of the noise reduction plate (31). The sound-absorbing element (32) is arranged on the back of the inclined section (312) of the noise reduction plate (31).

5. The range hood according to any one of claims 1 to 4, characterized in that: The grille assembly (40) is connected between the two noise reduction plate assemblies on the left and right sides, and the grille assembly (40) is inclined from back to front and upward as a whole.

6. The range hood according to claim 5, characterized in that: The grid assembly (40) shown includes an upper oil mesh grid (41) and a lower grid bar grid (42), with air inlets (410) distributed on the oil mesh grid (41).

7. The range hood according to any one of claims 1 to 4, characterized in that: The front of the smoke hood (20) has a vertically extending panel support (50), and the air inlet includes a main air inlet (51) opened at the lower part of the panel support (50) and an auxiliary air inlet (52) opened at the upper part of the panel support (50).

8. The range hood according to claim 7, characterized in that: The main air inlet (51) extends in the left and right direction, and the top edge of the main air inlet (51) extends upward from the left and right sides to the middle position, so that the top edge of the main air inlet (51) is in an inverted V shape.

9. The range hood according to claim 8, characterized in that: The main air inlet (51) has a first oil guide flange (511) that bends inward toward the smoke hood (20) at at least the top edge or the left and right side edges.

10. The range hood according to claim 7, characterized in that: The auxiliary air inlet (52) has at least two arranged sequentially on the left and right sides.

11. The range hood according to claim 7, characterized in that: It also includes a panel (60) rotatably disposed on the top front side of the smoke hood (20), the panel (60) having at least a first state and a second state as its position changes with rotation: In the first state, the panel (60) covers the front of the smoke hood (20), and the lower edge of the panel (60) extends to the bottom of the smoke hood (20), thereby blocking the main air inlet (51) and the auxiliary air inlet (52) together. In the second state, the panel (60) is deflected forward relative to the smoke hood (20) and opened, exposing the main air inlet (51) and the auxiliary air inlet (52).

12. The range hood according to claim 7, characterized in that: The front side of the panel support (50) has a partially recessed flue gas buffer cavity (53). The left and right dimensions of at least the upper part of the flue gas buffer cavity (53) gradually decrease from bottom to top. The main air inlet (51) and the auxiliary air inlet (52) are both arranged in the area where the flue gas buffer cavity (53) is located.

13. The range hood according to claim 12, characterized in that: At least the top edge and the left and right side edges of the panel bracket (50) protrude forward relative to the main body of the panel bracket (50).

14. The range hood according to claim 7, characterized in that: The panel bracket (50) is also provided with a guide plate (54) at the main air inlet (51), which extends obliquely upward from the lower edge of the main air inlet (51).

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