Range hood

Abstract

The application discloses a range hood. The range hood comprises a body, a fan assembly arranged in the body, a flow guide assembly connected to the body, the flow guide assembly comprising a flow guide plate provided with a smoke suction port, and a flow regulation assembly arranged in an internal space surrounded by the body and the flow guide assembly, the flow regulation assembly comprising a flow regulation plate capable of moving, a flow regulation channel communicated with the smoke suction port being formed between the flow regulation plate and an inner wall of the internal space, and the flow regulation plate being used for adjusting the size of the flow regulation channel when the flow regulation plate moves. The range hood has the flow regulation assembly arranged in the internal space, the flow regulation plate is movably arranged, and the size of the flow regulation channel can be adjusted when the flow regulation plate moves, so that the vortex of the inlet air can be effectively reduced, and the air performance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, in particular to a range hood. BACKGROUND

[0002] With the improvement of people's living standards, island range hood gradually popular in large flat and villa. In order to match the whole kitchen scene, island range hood is far away from the stove, and the appearance is thin, which makes the smoke suction effect of island range hood worse. In the related art, in order to improve the smoke suction effect of range hood, the range hood comprises a flow guide assembly, and the flow guide assembly is provided with a smoke suction port. By changing the position of the flow guide assembly, the position of the smoke suction port is changed, and the smoke suction effect is improved. However, the internal flow space of such range hood is spacious, and the flow velocity of the airflow in the internal space of the range hood will be reduced sharply, and vortex loss is easy to occur. SUMMARY

[0003] The present application provides a range hood.

[0004] The range hood of the present application comprises:

[0005] A body, wherein a fan assembly is arranged in the body;

[0006] A flow guide assembly connected to the body, wherein the flow guide assembly comprises a flow guide plate provided with a smoke suction port;

[0007] A flow regulating assembly arranged in an internal space surrounded by the body and the flow guide assembly, wherein the flow regulating assembly comprises a flow regulating plate capable of moving, and a flow regulating channel is formed between the flow regulating plate and an inner wall of the internal space and connected to the smoke suction port, and the flow regulating plate is used to adjust the size of the flow regulating channel when moving.

[0008] The range hood described above is provided with a flow regulating assembly, and the flow regulating plate is movably arranged. When the flow regulating plate moves, the size of the flow regulating channel can be adjusted, so that the vortex of the inlet air can be effectively reduced, and the air performance can be improved.

[0009] In some embodiments, in the flow direction of the airflow, the flow regulating channel has a shape of first increasing, then decreasing and then increasing again.

[0010] In some embodiments, the flow regulating plate comprises a first plate and a second plate, the first plate is rotationally connected to the body and the second plate, and the second plate is rotationally connected to the flow guide assembly.

[0011] In some embodiments, the flow guide plate is provided with an air inlet mesh, the mesh area of the air inlet mesh forms the smoke suction port, the second plate and the air inlet mesh extend along the length direction of the range hood, and the length of the second plate is greater than or equal to the length of the air inlet mesh.

[0012] In some embodiments, the flow guiding assembly includes two flow guiding plates forming an included angle between them, and the flow rectifying assembly includes two flow rectifying plates, with one flow rectifying plate and a corresponding flow guiding plate disposed on the same side of the range hood.

[0013] In some embodiments, each of the air deflectors has a first air inlet screen and a second air inlet screen with relatively fixed positions. The air deflector assembly can switch between a first position and a second position relative to the main body. When the air deflector assembly is in the first position, the first air inlet screen is exposed outside the main body and the second air inlet screen is hidden inside the main body. When the air deflector assembly is in the second position, both the first air inlet screen and the second air inlet screen are exposed outside the main body. Both the first air inlet screen and the second air inlet screen are provided with the smoke inlet.

[0014] In some embodiments, the two rectifier plates are arranged symmetrically along the central axis of the width side of the range hood.

[0015] In some implementations, the two rectifier plates form a wedge-shaped structure.

[0016] In some embodiments, the range hood includes a drive assembly and a connection assembly. The drive assembly is connected to the flow guide assembly via the connection assembly. The drive assembly is used to drive the flow guide assembly to perform lifting and lowering movements via the connection assembly. At least a portion of the drive assembly and the connection assembly are located within the space enclosed by the two rectifier plates.

[0017] In some embodiments, the surface of the rectifier plate is provided with a sound-absorbing structure.

[0018] In some embodiments, the rectifier plate has perforations, and the sound-absorbing structure covers the perforations.

[0019] In some embodiments, the range hood includes a drive assembly and a connection assembly. The drive assembly is connected to the flow guiding assembly via the connection assembly. The drive assembly is used to drive the flow guiding assembly to move up and down via the connection assembly. The range hood is provided with an oil-proof cover inside. The oil-proof cover is located above the flow guiding assembly and covers at least a portion of the drive assembly and the connection assembly.

[0020] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, wherein:

[0022] Figure 1 is a perspective view of an extractor hood according to an embodiment of the application;

[0023] Figure 2 is another perspective view of an extractor hood according to an embodiment of the application;

[0024] Figure 3 is a cross-sectional view of an extractor hood according to an embodiment of the application;

[0025] Figure 4 is another cross-sectional view of an extractor hood according to an embodiment of the application;

[0026] Figure 5 is yet another perspective view of an extractor hood according to an embodiment of the application;

[0027] Figure 6 is yet another perspective view of an extractor hood according to an embodiment of the application;

[0028] Figure 7 is yet another cross-sectional view of an extractor hood according to an embodiment of the application;

[0029] Figure 8 is yet another cross-sectional view of an extractor hood according to an embodiment of the application;

[0030] Figure 9 is a structural view of a flow straightener according to an embodiment of the application;

[0031] Figure 10 is yet another perspective view of an extractor hood according to an embodiment of the application;

[0032] Figure 11 is yet another cross-sectional view of an extractor hood according to an embodiment of the application;

[0033] Figures 12 to 18 is a position view of a flow straightener according to an embodiment of the application;

[0034] Figure 19 is a side view of an extractor hood according to an embodiment of the application;

[0035] Figures 20 to 27 is a cross-sectional view of an extractor hood according to an embodiment of the application;

[0036] Figure 28 is an exploded view of an extractor hood according to an embodiment of the application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described below in detail with reference to the accompanying drawings, in which like or similar elements are denoted by the same or similar reference numerals, and the embodiments described below are examples for explaining the present application, and are not intended to be limiting of the present application.

[0038] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0039] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected. It can be a mechanical connection, or an electrical connection. It can be directly connected, or indirectly connected through an intermediate medium. It can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In the present application, unless otherwise explicitly specified and limited, "on" or "under" of a first feature to a second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, "on", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is horizontally higher than the second feature. "Below", "under" and "under" of the first feature to the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the first feature is horizontally lower than the second feature.

[0041] The disclosure herein provides many different embodiments or examples for implementing different structures of the present application. For the purpose of simplification of the present application, the components and arrangements of the particular examples are described herein. These are, of course, merely examples and are not intended to limit the present application. Further, the present application can repeat reference numerals and / or letters in various examples and this repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and / or configurations discussed. Further, the present application provides various examples of specific processes and materials, but one skilled in the art will appreciate that other processes and / or materials can be used.

[0042] Please refer to Figures 1 to 2 , Figures 5 to 6 , an oil smoke exhaust fan 100 of an embodiment of the present application comprises a flow guide assembly 14. As shown in Figure 1 , the flow guide assembly 14 of the embodiment can move up and down. The side of the flow guide assembly 14 presents a V-shaped structure, and the two flow guide plates 20 of the V-shaped structure are provided with an air inlet mesh, and the mesh area of the air inlet mesh can form a smoke suction port 22. When the flow guide assembly 14 is retracted, the side profile of the flow guide assembly 14 coincides with the side profile of the flow guide plate 20. The appearance consistency of the oil smoke exhaust fan 100 of the embodiment is good, and can meet the demand for compact space in the middle island scene. After the flow guide assembly 14 is retracted, the main air inlet mesh provided on the two flow guide plates 20 of the V-shaped structure of the whole machine can normally intake air, meeting the use demand of the user under the condition of oil smoke cleaning.

[0043] Figure 20 and Figure 21 , the flow guide assembly 14 of the oil smoke exhaust fan 100 (the fairing assembly 16 is hidden) of an embodiment of the present application is retracted, and the internal structure schematic diagram of the whole machine is shown. The first slide rail fixed plate 80 is fixed with the whole machine, for example, is fixedly connected with the inner wall of the machine frame assembly 30. The motor 76 is fixedly connected with the first slide rail fixed plate 80. The connecting plate 82 and the second slide rail fixed plate 84 are fixed on the cross beam 74, and the second slide rail fixed plate 84 is connected with the first slide rail fixed plate 80 through a slide rail. The connecting plate 82 is fixedly connected with the sliding block 78. When the motor 76 operates, the sliding block 78 is driven to realize linear motion in the up-down direction.

[0044] Figure 24 and Figure 25The figure is the internal structure schematic diagram of the range hood 100 (the rectifier assembly 16 is hidden) of the embodiment of the present application when the flow guide assembly 14 is opened. As shown in the figure, the V-shaped flow guide assembly 14 moves downward, the air inlet net moves downward to shorten the distance with the flue gas, and the smoke suction effect of the range hood is enhanced. The included angle between the two flow guide plates 20 of the V-shaped flow guide assembly 14 is reduced, which is beneficial to the diversion of the flue gas and the optimization of the space of the flow guide assembly 14. With the opening of the flow guide assembly 14, the auxiliary air inlet net is exposed, which can cooperate with the main air inlet net to achieve auxiliary flue gas capture and further enhance the smoke suction effect.

[0045] In Figure 24 and Figure 25 , the lower end of the connecting plate 82 and the second slide rail fixed plate 84 is fixedly connected with the flow guide assembly 14. The sliding block 78 drives the connecting plate 82 to move, and then drives the flow guide assembly 14 to move up and down. The second slide rail fixed plates 84 on both sides are fixedly connected with the slide rails, which play the functions of guiding and stabilizing. Figure 28 The figure is the explosion schematic diagram of the range hood 100 (the rectifier assembly 16 is hidden) of the embodiment of the present application.

[0046] Figure 22 and Figure 23 The figure is the internal flue gas flow schematic diagram of the range hood 100 (the rectifier assembly 16 is hidden) of the embodiment of the present application when the flow guide assembly 14 is retracted. After the flue gas enters the range hood 100, the flue gas contacts the connecting plate 82, the motor 76 and the like, resulting in the existence of oil stains on the surface of the connecting plate 82, the motor 76 and the like. The condensed oil not only has the risk of penetrating into the air inlet net, but also affects the operation of the motor 76. The motor 76 is a semi-open system, and after the oil stains enter, the motor 76 will run disorderly, and problems such as abnormal noise and vibration will occur. After the flue gas enters the range hood 100, the flow area suddenly increases, which is easy to produce vortex loss, resulting in the deterioration of air performance and noise.

[0047] Figure 26 and Figure 27 The figure is the internal flue gas flow schematic diagram of the range hood 100 (the rectifier assembly 16 is hidden) of the embodiment of the present application when the flow guide assembly 14 is opened. The flue gas flow when the flow guide assembly 14 is opened is similar to the flue gas flow when the flow guide assembly 14 is retracted, and the problems are similar.

[0048] Further, please refer to Figures 1 to 9The oil fume extractor 100 includes a body 12, a flow guide assembly 14, and a flow regulation assembly 16. The body 12 is provided with a fan assembly 18. The flow guide assembly 14 is movably connected to the body 12 and includes a flow guide plate 20 provided with a smoke suction opening 22. The flow regulation assembly 16 is located in an internal space 24 enclosed by the body 12 and the flow guide assembly 14 and includes a flow regulation plate 26 that is movable and forms a flow regulation passage 28 in communication with the smoke suction opening 22 between the flow regulation plate 26 and an inner wall of the internal space 24. The flow regulation plate 26 is used to adjust the flow space size of the flow regulation passage 28 when the flow regulation plate 26 is moved.

[0049] The oil fume extractor 100 is provided with the flow regulation assembly 16, and the flow regulation plate 26 is movably arranged. The flow space size of the flow regulation passage 28 can be adjusted when the flow regulation plate 26 is moved, so that the vortex of the inlet air can be effectively reduced, and the air performance can be improved. In addition, the flow regulation plate 26 is arranged, so that the internal space 24 enclosed by the body 12 and the flow guide assembly 14 is not too spacious, and the flow rate in the body 12 can be effectively reduced, and the noise can be optimized.

[0050] Specifically, the oil fume extractor 100 can be a middle island oil fume extractor or an island oil fume extractor. The oil fume extractor 100 can be installed below a ceiling and above a cooking appliance. The cooking appliance can include a gas cooking appliance or an induction cooker. The cooking appliance can include one or more burners on which cooking utensils can be placed. The oil fume extractor 100 can be installed directly above the cooking appliance, and the flow guide assembly 14 corresponds to the position of the burners of the cooking appliance. When cooking, the oil fume extractor 100 is turned on to suck the smoke generated during cooking.

[0051] In an embodiment, the flow regulation plate 26 can be rotatably arranged in the oil fume extractor 100. The flow space size of the flow regulation passage 28 can be changed when the flow regulation plate 26 is rotated. The flow regulation plate 26 can be rotated with the lifting movement of the flow guide assembly 14, or a rotating mechanism of the flow regulation plate 26 can be arranged outside the flow guide assembly 14 to drive the flow regulation plate 26 to rotate. In other embodiments, the flow regulation plate 26 can also be arranged to perform lifting movement (without rotation or flipping movement). The lifting movement can be performed with the lifting of the flow guide assembly 14, or an additional lifting structure can be arranged to drive the flow regulation plate 26 to perform lifting movement. In an embodiment, the inclination angle of the flow guide plate 20 changes during the lifting of the flow guide assembly 14, and the inclination angle of the smoke suction opening 22 also changes accordingly. The inner wall of the flow guide plate 20 can constitute part of the inner wall of the internal space 24. Even if the flow regulation plate 26 only performs lifting movement without rotation or flipping movement, the lifting movement of the flow regulation plate 26 and the change of the inclination angle of the flow guide plate 20 together can also adjust the flow space size of the flow regulation passage 28. An air inlet mesh can be arranged on the flow guide plate 20, and the mesh area of the air inlet mesh can constitute the smoke suction opening 22.

[0052] In one embodiment, the body 12 comprises a rack assembly 30 and a fixing assembly 32, the fan assembly 18 is arranged in the rack assembly 30, the rack assembly 30 is fixedly connected to the fixing assembly 32, and the guide assembly 14 is movably connected to the fixing assembly 32. The inner wall of the internal space 24 surrounded by the body 12 and the guide assembly 14 can comprise the inner wall of the guide plate 20, the inner wall of the fixing assembly 32 and the inner wall of the rack assembly 30.

[0053] The fan assembly 18 can comprise a volute 34 and a fan 36, the fan 36 is arranged in the volute 34, the volute 34 is provided with an air inlet 38 and an air outlet 40 (see Figure 21 ), and the top of the rack assembly 30 can be provided with a check valve 42. When the fan 36 is started, the smoke is sucked through the air inlet 38 and the suction port 22, and is discharged to the check valve 42 through the air outlet 40. The check valve 42 is opened to discharge the smoke to the flue. The range hood 100 further comprises an oil cup 44, which can be arranged at the bottom of the guide assembly 14. The oil cup 44 can collect oil stains falling from the components of the range hood 100, such as the guide assembly 14, the rack assembly 30 and the rectifier plate 26.

[0054] The range hood 100 further comprises a decorative cover 46 (see Figure 28 ), which is sleeved on the outer periphery of the rack assembly 30 to make the range hood 100 more beautiful.

[0055] It can be understood that in other embodiments, the guide assembly 14 can be fixedly connected to the body 12, and the rectifier plate 26 can be driven by an additional driving mechanism.

[0056] In some embodiments, in the flow direction of the airflow, the rectifier channel 28 has a shape of first increasing, then decreasing and then increasing. In this way, the smoke suction effect and the noise reduction effect can be improved.

[0057] Specifically, when the fan assembly 18 works, the smoke is sucked from the suction port 22, and enters the rectifier channel 28 from the suction port 22. In the flow direction of the airflow, the rectifier channel 28 has a shape of first increasing, then decreasing and then increasing, so that the smoke entering the rectifier channel 28 first enters the larger rectifier channel 28 for diffusion, then enters the smaller rectifier channel 28 for acceleration, and then enters the larger rectifier channel 28 for deceleration. When the smoke is accelerated in the smaller rectifier channel 28, the flow rate of the smoke at the suction port 22 can be ensured, so that the smoke suction effect is improved. When the smoke is decelerated in the larger rectifier channel 28, the flow rate inside the rack assembly 30 can be reduced, so that the noise inside the range hood 100 is reduced, and the noise reduction effect is improved.

[0058] In Figure 4In the shown embodiment, the flue gas first enters the larger rectifying passage 28 marked as B, the smaller rectifying passage 28 marked as C, and then enters the larger rectifying passage 28 marked as D.

[0059] The above adjustment of the flow rate is to adjust the flow rate by adjusting the flow area at different positions in the range hood 100 under the same flow rate, wherein the flow area of the larger rectifying passage 28 is larger, and the flow area of the smaller rectifying passage 28 is smaller. The flow rate increases as the flow area decreases, and the flow rate decreases as the flow area increases. The flow area changes are respectively for the smoke suction port 22 (the front end of the range hood 100) and the inside of the range hood 100.

[0060] In some embodiments, please refer to Figure 9 The rectifying plate 26 includes a first plate 48 and a second plate 50, the first plate 48 is rotationally connected to the body 12 and the second plate 50, and the second plate 50 is rotationally connected to the flow guide assembly 14. In this way, the flow space size of the rectifying passage 28 can be adjusted by rotating the rectifying plate 26.

[0061] Specifically, in the embodiments of the present application, the first plate 48 and the second plate 50 are both flat cuboids. The range hood 100 further includes a driving assembly 52 and a connecting assembly 54, the driving assembly 52 is connected to the flow guide assembly 14 through the connecting assembly 54 and is used to drive the connecting assembly 54 to drive the flow guide assembly 14 to perform the lifting movement. The driving assembly 52 and the connecting assembly 54 can be arranged below the volute 34.

[0062] The upper end of the first plate 48 can be rotationally connected to the inside of the rack assembly 30, for example, the upper end of the first plate 48 can be rotationally connected to the upper end of the connecting assembly 54, the lower end of the first plate 48 is rotationally connected to the upper end of the second plate 50, and the lower end of the second plate 50 is rotationally connected to the lower end of the connecting assembly 54. The first plate 48 and the second plate 50 are connected in a V-shaped structure (please refer to Figure 4 An included angle (which can be greater than zero degrees and less than or equal to 180 degrees) is formed between the first plate 48 and the second plate 50.

[0063] In the case that the connecting assembly 54 drives the flow guide assembly 14 to perform the lifting movement, the connecting assembly 54 drives the rectifying plate 26 to perform the lifting movement, so that the included angle between the first plate 48 and the second plate 50 changes. Specifically, please refer to Figure 8 When the flow guide assembly 14 is lowered, the included angle between the first plate 48 and the second plate 50 becomes larger, and the longitudinal dimension of the rectifying plate 26 in the flow direction of the airflow appears to be larger (more slender). Please refer to Figure 4, the angle between the first plate 48 and the second plate 50 can be reduced, and the rectifier plate 26 appears to be larger in the lateral dimension in the flow direction of the airflow. Thus, by adjusting the angle between the first plate 48 and the second plate 50, the rectifier plate 26 is adjusted in the longitudinal and lateral dimensions, and the flow space of the rectifier channel 28 is adjusted, and the size adjustment of the rectifier plate 26 is synchronized with the lifting movement of the flow guide assembly 14, which is simple in structure and easy to implement.

[0064] In one embodiment, please refer to Figure 9 , the upper end of the first plate 48 can be provided with a first shaft sleeve 56, and the first shaft sleeve 56 can be penetrated by a first rotating shaft to rotatably connect the upper end of the connecting assembly 54, the lower end of the first plate 48 can be provided with a second shaft sleeve 58, the upper end of the second plate 50 can be provided with a third shaft sleeve 60, the second shaft sleeve 58 and the third shaft sleeve 60 are alternately arranged, the lower end of the first plate 48 and the upper end of the second plate 50 can be rotatably connected by penetrating the second shaft sleeve 58 and the third shaft sleeve 60 with a second rotating shaft, and the lower end of the second plate 50 can be provided with a fourth shaft sleeve 62, and the fourth shaft sleeve 62 can be penetrated by a third rotating shaft to rotatably connect the lower end of the connecting assembly 54. In this embodiment, please refer to Figure 4 , the flow area of the rectifier channel 28 at the position of the second rotating shaft is reduced relative to the area of the air inlet net. By driving the movement of the rectifier plate 26 by the flow guide assembly 14, the flow area at the rear end of the air inlet net can be effectively adjusted. In this way, the flow rate of the flue gas after the air inlet net at the rear end of the air inlet net can be increased (under the same flue gas flow, the area is reduced, and the flow rate per unit area is increased), and the increase of the flow rate at the rear end of the air inlet net can effectively drive the flow rate at the front end of the air inlet net, and the increase of the flow rate at the front end of the air inlet net can enhance the smoke suction effect of the range hood 100.

[0065] In addition, when the flow guide assembly 14 is retracted, the first plate 48 can guide the oil stains in the volute 34 and the rack assembly 30, etc., to avoid the oil stains from dripping into the air inlet net.

[0066] In some embodiments, the flow guide plate 20 is provided with an air inlet net, the mesh area of the air inlet net forms the smoke suction port 22, the second plate 50 and the air inlet net extend along the length direction of the range hood 100, and the length of the second plate 50 is greater than or equal to the length of the air inlet net. In this way, the second plate 50 can effectively shield the mesh of the air inlet net, avoid the user from seeing the inside of the range hood 100 through the air inlet net, enhance the overall appearance of the appearance, and the second plate 50 can also guide the condensed oil stains to avoid the oil stains from dripping into the air inlet net.

[0067] Specifically, the second plate 50 is closer to the flow guide plate 20 than the first plate 48. Please refer to Figure 10 and Figure 11The second plate 50 can be extended horizontally along the guide plate 20. The length of the second plate 50 can be greater than or equal to the length of the air inlet mesh, so that when users look at the interior of the range hood 100 through the mesh of the air inlet mesh, they only see the second plate 50, avoiding the view of internal components and enhancing the overall aesthetic appeal. Furthermore, condensed grease can flow down the surface of the second plate 50 and be collected in the grease cup 44, preventing grease from dripping through the air inlet mesh and causing cleaning burden for the user. The length of the range hood 100 can be horizontal.

[0068] In some embodiments, the airflow guiding assembly 14 includes two airflow guiding plates 20 forming an included angle, and the airflow rectifying assembly 16 includes two airflow rectifying plates 26, with one airflow rectifying plate 26 and a corresponding airflow guiding plate 20 disposed on the same side of the range hood 100. This improves the smoke extraction effect.

[0069] Specifically, the included angle between the two guide plates 20 can be greater than zero degrees and less than 180 degrees. Viewed from the side (left or right) of the range hood 100, the connection between the two guide plates 20 roughly forms a V-shape. The mesh area of ​​the air inlet of each guide plate 20 can form a smoke inlet 22, meaning the smoke inlets 22 on both sides of the guide assembly 14 are V-shaped. When the fan 36 starts, it can draw smoke from both sides of the range hood 100, improving the smoke extraction effect.

[0070] During the raising and lowering process of the flow guide assembly 14, the tilt angle of the smoke inlet 22 can be changed. For example, during the lowering process of the flow guide assembly 14, the smoke inlet 22 descends and changes the tilt angle A of the smoke inlet 22 (the tilt angle A of the smoke inlet 22 increases during descent, and the increase in tilt angle A can optimize the negative pressure distribution; the tilt angle A of the flow guide plate 20 relative to the horizontal plane ranges from 35° to 65°, such as...). Figure 4 As shown. The lifting height of the flow guide assembly 14 can be 100 to 250 mm.

[0071] Please combine Figure 3 The volute 34 has two air inlets 38, which are located on opposite sides of the volute 34 (e.g., Figure 4 (As shown on the front and back sides), one of the guide vanes 20 is located below one of the air inlets 38, and the other guide vane 20 is located below the other air inlet 38. This can reduce the path of the smoke from the guide vane 20 to the volute 34 and improve the smoke extraction effect.

[0072] A rectifier plate 26 and a corresponding guide plate 20 are disposed on the same side of the range hood 100, so that rectifier channels 28 are provided on both sides (such as the front and rear sides) of the range hood 100. In this embodiment, the rectifier plates 26 on both sides can synchronously adjust the flow space size (such as the flow area size) of the rectifier channel 28 with the lifting and lowering movement of the guide assembly 14.

[0073] The single-sided rectification plate 26 can form a converging accelerating rectification channel 28 inside the flow guide assembly 14. Specifically, the converging accelerating rectification channel 28 can be located at the position of the second rotating shaft. In the present embodiment, the flow area of the rectification channel 28 at the position of the second rotating shaft is reduced relative to the area of the air inlet net. By driving the rectification plate 26 to move through the flow guide assembly 14, the flow area at the rear end of the air inlet net can be effectively adjusted. In this way, the flow rate of the flue gas after entering the flow guide plate 20 at the rear end of the air inlet net can be increased (under the same flue gas flow, the area is reduced, and the flow rate per unit area is increased). The increase in the flow rate at the rear end of the air inlet net can effectively drive the flow rate at the front end of the air inlet net, and the increase in the flow rate at the front end of the air inlet net can enhance the smoke suction effect of the range hood 100. The converging accelerating rectification channel 28 can ensure smooth air intake and avoid the generation of vortexes under low flow (small flue gas). At the same time, the flow rate of the flue gas is ensured, and the problem of low air intake flow rate and poor smoke suction effect caused by excessive air intake area is avoided. More specifically, under low flow, if the rectification assembly 16 is not provided, the flue gas will have a more severe speed reduction after entering the range hood 100, and the flow at the front end of the air inlet net will correspondingly decrease, which will result in poor smoke suction effect. The range hood 100 of the present embodiment can reduce the flow area of the rectification channel 28 at the position of the second rotating shaft under low flow, so that the flow rate can be ensured and the smoke suction effect can be ensured under low flow.

[0074] The single-sided rectification plate 26 (such as the first plate 48) forms a gradually expanding flow channel inside the rack assembly 30, which can reduce the flow rate of the flue gas, reduce the collision between air flows, and optimize the noise of the entire machine. Specifically, reducing the flow rate inside the rack assembly 30 can optimize the noise inside the range hood 100. It should be noted that the above adjustment of the flow rate is to adjust the flow rate by adjusting the flow area of the rectification channel 28 at different positions of the range hood 100 under the same flow. The flow rate increases when the area decreases, and the flow rate decreases when the area increases. The area change is respectively for the front end of the range hood 100 and the inside of the range hood 100.

[0075] Figures 7 to 8 FIG. 10 is a schematic diagram of the internal flue gas flow when the flow guide assembly 14 of the range hood 100 with the rectification assembly 16 is opened. The flue gas flow when the flow guide assembly 14 is opened is similar to the flue gas flow when the flow guide assembly 14 is retracted, and the improved problems are similar. Details are not expanded here.

[0076] It can be understood that in other embodiments, the rectification plates 26 on both sides can operate asynchronously, one side of the rectification plate 26 rotates synchronously with the lifting of the flow guide assembly 14. The other side can move through a separate driving mechanism or be set as a fixed rectification plate 26 (without rotation and flipping) to move up and down with the flow guide assembly 14. In other embodiments, the rectification plates 26 on both sides can move through separate driving mechanisms or be set as fixed rectification plates 26 (without rotation and flipping) to move up and down with the flow guide assembly 14.

[0077] It is understood that in other embodiments, the range hood 100 may also be provided with a guide plate 20 and a rectifier plate 26, which is not specifically limited here.

[0078] In some implementations, please refer to Figure 3 Each deflector 20 has a first air inlet mesh 64 and a second air inlet mesh 66 with relatively fixed positions. The deflector assembly 14 can switch between a first position and a second position relative to the main body 12. In the first position, the first air inlet mesh 64 is exposed outside the main body 12 and the second air inlet mesh 66 is hidden inside the main body 12. In the second position, both the first air inlet mesh 64 and the second air inlet mesh 66 are exposed outside the main body 12. Both the first air inlet mesh 64 and the second air inlet mesh 66 are provided with smoke inlets 22. In this way, by changing the position of the deflector assembly 14, the first air inlet mesh 64 can form a smoke inlet 22 alone or together with the second air inlet mesh 66, improving the negative pressure distribution and thus improving the smoke extraction effect.

[0079] Specifically, the air intake network may include a first air intake network 64 and a second air intake network 66. The first air intake network 64 may serve as the main air intake network, and the second air intake network 66 may serve as the auxiliary air intake network.

[0080] When the stove fumes are relatively low, the guide assembly 14 can be in the first position, and the range hood 100 draws in the fumes through the first air intake mesh 64. When the stove fumes are relatively high, the guide assembly 14 can be lowered to the second position, and the range hood 100 draws in the fumes through the first air intake mesh 64 and the second air intake mesh 66. On the one hand, the suction opening 22 formed by the two air intake meshes lowers, allowing it to get closer to the stove and improve the suction effect. On the other hand, during the raising and lowering process of the guide assembly 14, the tilt angle of the suction opening 22 of the air intake mesh can be changed, improving the negative pressure distribution and enhancing the suction effect. In addition, the range hood 100 may also include a controller and a fume sensor. The controller is electrically connected to the fume sensor, which is used to collect fume data. The controller is used to calculate the fume concentration based on the fume data and control the raising and lowering of the guide assembly 14 to a certain working position based on the fume concentration. This working position can be the first position, the second position, or other positions. The correspondence between the fume concentration and the working position can be pre-calibrated and stored in the range hood 100.

[0081] It is understood that the flow guide component 14 can also be located in other positions besides the first position and the second position. By controlling the lifting stroke of the flow guide component 14, the flow guide component 14 can be located in the first position, the second position and other positions to provide different smoking capabilities to adapt to the size of the smoke.

[0082] In one embodiment, the first position can be a position where the maximum stroke of the lifting and retracting of the flow guide assembly 14 is located, and the second position can be a position where the maximum stroke of the opening and lowering of the flow guide assembly 14 is located. Wherein, as shown in Figures 1 to 4 , when the flow guide assembly 14 is in the first position, the distance between the flow guide assembly 14 and the cooktop is the largest, or in other words, the distance between the oil cup 44 and the body 12 is the smallest; as shown in Figures 5 to 8 , when the flow guide assembly 14 is in the second position, the distance between the flow guide assembly 14 and the cooktop is the smallest, or in other words, the distance between the oil cup 44 and the body 12 is the largest. It can be understood that in other embodiments, the first position and the second position can also be other positions, which are not specifically limited here.

[0083] Please refer to Figures 1-4 , when the flow guide assembly 14 is in the first position, the second air inlet net 66 is hidden in the body 12 as a whole or in most part, and does not participate in smoking or has a small degree of participation in smoking. Please refer to Figures 5-8 , when the flow guide assembly 14 is in the second position, the second air inlet net 66 is exposed outside the body 12 as a whole or in most part, and participates in smoking or has a large degree of participation in smoking.

[0084] No matter in the first position or the second position, or other positions, the first air inlet net 64 is exposed outside the body 12 as a whole or in most part, and participates in smoking. The first air inlet net 64 can include an outer air inlet net and an inner air inlet net, and the outer air inlet net and the inner air inlet net partially overlap. Both the outer air inlet net and the inner air inlet net can be detachably mounted on the flow guide plate 20 to facilitate cleaning of the air inlet net. In addition, a glass panel is also mounted on the flow guide plate 20 to facilitate cleaning of the flow guide plate 20.

[0085] The smoking port 22 formed by the first air inlet net 64 can serve as a lower smoking port 22, and the smoking port 22 formed by the second air inlet net 66 can serve as an upper smoking port 22, so as to form a lower smoking port 22 for main suction and an upper smoking port 22 for auxiliary suction.

[0086] In one embodiment, the first air inlet net 64 and / or the second air inlet net 66 can be mounted at different openings of the flow guide plate 20. In one embodiment, the first air inlet net 64 and / or the second air inlet net 66 can be formed by directly punching holes on the flow guide plate 20. The mesh area formed by the air inlet net can form a smoking port 22. The degree of participation of different air inlet nets in smoking gas is changed by the lifting movement of the flow guide assembly 14.

[0087] The positions of the first air inlet net 64 and the second air inlet net 66 are relatively fixed, that is, the relative positions between the first air inlet net 64 and the second air inlet net 66 do not change regardless of the position of the guide assembly 14, so that the problem of smoke accumulation in the sliding parts caused by mutual sliding between different air inlet nets and difficult to clean can be avoided.

[0088] Please refer to Figure 19 The fixed assembly 32 includes a sliding sleeve 68 and two opposite side plates 70, each of which is provided with a sliding groove 72, the sliding sleeve 68 passes through the sliding groove 72, the upper end of the guide plate 20 is rotatably connected to the sliding sleeve 68, the sliding groove 72 is obliquely downward along the horizontal plane, and the sliding sleeve 68 can move along the sliding groove 72. During the lowering process of the guide assembly 14, the guide plate 20 can rotate around the axis of the sliding sleeve 68, the upper end of the guide plate 20 can move obliquely downward along the sliding groove 72, and the upper ends of the two guide plates 20 are close to each other. During the lifting process of the guide assembly 14, the guide plate 20 can rotate in the opposite direction around the axis of the sliding sleeve 68, the upper end of the guide plate 20 can move obliquely upward along the sliding groove 72, and the upper ends of the two guide plates 20 are away from each other.

[0089] The lower end of the guide plate 20 is rotatably connected to the connecting assembly 54. In an embodiment, the connecting assembly 54 includes a through beam 74, the through beam 74 is fixedly connected to the guide assembly 14, and the lower end of the guide plate 20 is rotatably connected to the through beam 74.

[0090] In some embodiments, please refer to Figure 4 The two rectifying plates 26 are symmetrically arranged along the central axis L1 of the width side of the range hood 100. In this way, the structure of the range hood 100 can be simplified, and the rectifying effect on the oil fume is good.

[0091] Specifically, the two rectifying plates 26 symmetrically arranged along the central axis of the width side of the range hood 100 can be basically the same on the connecting structure for connecting the rectifying plates 26 inside the range hood 100, and there is no need to separately provide different connecting structures to connect the rectifying plates 26 on different sides, thereby simplifying the structure of the range hood 100. The two symmetrically arranged rectifying plates 26 have basically the same influence on the airflow on the other side, and the influence on the airflow on the other side of one rectifying plate 26 is basically the same as that of the other rectifying plate 26, which cancels out each other, avoids causing additional airflow disturbance, and improves the rectifying effect. The width side of the range hood 100 can be a side along the front-rear direction. The length side of the range hood 100 can be a side along the left-right direction.

[0092] In addition, the two guide plates 20 can also be symmetrically arranged along the central axis L1 of the width side of the range hood 100.

[0093] It can be understood that in other embodiments, the two rectifying plates 26 can also be asymmetrically arranged.

[0094] In some embodiments, the two rectifying plates 26 form a wedge-shaped structure. In this way, the wedge-shaped structure can be adjusted in size as a whole, thereby adjusting the flow space size of the rectifying channel 28.

[0095] Specifically, in the present embodiment, the rectifying plate 26 comprises a first plate 48 and a second plate 50 connected by rotation, and the two sides of the range hood 100 are provided with the rectifying plate 26. The two rectifying plates 26 on the two sides form a wedge-shaped structure, which can be located below the volute 34 and at the inlet of the rack assembly 30. The wedge-shaped structure synchronously operates when the flow guide assembly 14 moves up and down. Specifically, please refer to Figure 8 When the flow guide assembly 14 is lowered, the lateral size of the wedge-shaped structure becomes smaller, the longitudinal size becomes larger, and the wedge-shaped structure becomes more slender. Please refer to Figure 4 When the flow guide assembly 14 is raised, the lateral size of the wedge-shaped structure becomes larger, the longitudinal size becomes smaller, and the wedge-shaped structure becomes more bulky. That is, the rectifying plate 26 can move with the up and down movement of the flow guide assembly 14. When the flow guide assembly 14 moves downward, the air inlet area formed by the first air inlet net 64 and the second air inlet net 66 increases, and the wedge-shaped structure formed by the rectifying plate 26 becomes more slender, thereby synchronously increasing the air inlet area of the rectifying channel 28 under the premise of ensuring the rectifying characteristics. Therefore, the rectifying plate 26 can dynamically adjust the air inlet area inside the range hood 100 according to the stroke change of the flow guide assembly 14.

[0096] More specifically, when the flow of the range hood 100 is large (such as the smoke is large), the flow area at the position of the second rotating shaft can be increased by the movement of the corresponding mechanism, so that the problem of the noise increase of the range hood 100 due to the insufficient air inlet area caused by the flow increase can be avoided. When the flow of the range hood 100 is small (such as the smoke is small), the flow area at the position of the second rotating shaft can be reduced by the movement of the corresponding mechanism, so that the problem of the front end flow speed reduction of the range hood 100 and the deterioration of the smoke suction effect caused by the excessive air inlet area due to the flow reduction can be avoided. In addition, the mechanism for adjusting the shape of the rectifying plate 26 can be the flow guide assembly 14, that is, the shape adjustment of the rectifying plate 26 is synchronized with the up and down movement of the flow guide assembly 14. The mechanism for adjusting the shape of the rectifying plate 26 can also be independent of the flow guide assembly 14, which can be synchronized with the up and down movement of the flow guide assembly 14 or performed at different times. Herein, no specific limitation is made.

[0097] In summary, the range hood 100 in the present embodiment can control the flow speed inside the range hood 100 and outside the range hood 100 (air inlet net) within a certain range, and balance the smoke suction effect and noise of the range hood 100.

[0098] In some embodiments, the rectifying plate 26 can also be provided as shown in Figures 12 to 18 It should be noted that, Figures 12 to 18is a schematic diagram, only shows the distribution form of the rectifier plate 26 inside the range hood 100, and other components of the range hood 100 are omitted. In addition, those skilled in the art can also make various changes, modifications, replacements and modifications based on the embodiments of the rectifier plate 26 provided in the present application to obtain other embodiments, and these other embodiments are also within the protection scope of the present application.

[0099] In some embodiments, please refer to Figure 3 The range hood 100 includes a driving assembly 52 and a connecting assembly 54, the driving assembly 52 is connected to the flow guide assembly 14 through the connecting assembly 54, the driving assembly 52 is used to drive the flow guide assembly 14 to move up and down through the connecting assembly 54, and at least part of the driving assembly 52 and the connecting assembly 54 is located in the space surrounded by the two rectifier plates 26. In this way, the oil pollution of at least part of the driving assembly 52 and the connecting assembly 54 can be reduced, the service life of the related components can be enhanced, and the problems such as movement jamming, shaking, abnormal sound and the like caused by oil pollution can be reduced.

[0100] Specifically, at least part of the driving assembly 52 and the connecting assembly 54 is located in the space surrounded by the two rectifier plates 26, when the flue gas enters the inside of the range hood 100, the rectifier plate 26 will block most of the flue gas, so that the flue gas entering the space surrounded by the two rectifier plates 26 is greatly reduced, the oil pollution of at least part of the driving assembly 52 and the connecting assembly 54 can be effectively reduced, the service life of the related components can be enhanced, and the problems such as movement jamming, shaking, abnormal sound and the like caused by oil pollution can be reduced.

[0101] In one embodiment, the driving assembly 52 can include a motor 76 and a sliding block 78, part or all of the motor 76 can be located in the space surrounded by the two rectifier plates 26, and part or all of the sliding block 78 can be located in the space surrounded by the two rectifier plates 26. In one embodiment, the motor 76 can be a push rod motor 76. When the motor 76 is started, it can drive the sliding block 78 to move up and down, and drive the connecting assembly 54 and the flow guide assembly 14 to move up and down. It can be understood that in other embodiments, the motor 76 can also be other types of motors 76, and is not limited to the push rod motor 76. For example, the driving assembly 52 can include a gear set or a lead screw, and the rotation of the motor 76 driving shaft is converted into the up and down movement of the sliding block 78 through the gear set or the lead screw.

[0102] The connecting assembly 54 can include a cross beam 74, a first slide rail fixing plate 80, a connecting plate 82, and a second slide rail fixing plate 84. The first slide rail fixing plate 80 is fixed to the whole machine, for example, fixed to the inner wall of the rack assembly 30. The motor 76 is fixed to the first slide rail fixing plate 80. The connecting plate 82 and the second slide rail fixing plate 84 are fixed to the cross beam 74, and the second slide rail fixing plate 84 is connected to the first slide rail fixing plate 80 through a slide rail. The connecting plate 82 is fixed to the slide block 78. When the motor 76 operates, the slide block 78 is driven to realize linear motion in the up-down direction.

[0103] In an embodiment, the whole connecting assembly 54 can be located in the space surrounded by the two straightening plates 26. In an embodiment, part of the connecting assembly 54 can be located in the space surrounded by the two straightening plates 26, for example, one or more of the cross beam 74, the first slide rail fixing plate 80, the connecting plate 82, the second slide rail fixing plate 84, and the slide rail can be located in the space surrounded by the two straightening plates 26, or part of one or more of them can be located in the space surrounded by the two straightening plates 26, and the like, which are not limited herein.

[0104] In some embodiments, the surface of the straightening plate 26 is provided with a sound absorption structure (not shown in the figure). In this way, the noise inside the range hood 100 can be reduced.

[0105] Specifically, when the flue gas flows inside the range hood 100, it can cause wind noise and may also cause vibration of the straightening plate 26. By providing a sound absorption structure on the surface of the straightening plate 26, the noise caused by wind noise and / or vibration of the straightening plate 26 can be eliminated, achieving the effect of noise reduction.

[0106] The sound absorption structure can include porous and fluffy structural members, such as glass wool, PU cotton, and the like. More specifically, the sound absorption structure can include: porous sound absorption materials (the surface attached with a film can also solve the problem of oil penetration), thin-walled vibration sound absorption structure, resonant cavity sound absorption structure, and the like, which are not limited herein.

[0107] Please refer to Figure 7 The surface of the straightening plate 26 can include a first surface 86 facing the inner wall of the rack assembly 30, the inner wall of the fixing assembly 32, and the inner wall of the guide plate 20, and a second surface 88 facing the connecting assembly 54, and at least one of the first surface 86 and the second surface 88 is provided with a sound absorption structure. In other embodiments, the entire surface of the straightening plate 26 can also be provided with a sound absorption structure.

[0108] In some embodiments, the straightening plate 26 is provided with perforations (not shown in the figure), and the sound absorption structure covers the perforations. In this way, the noise reduction effect can be improved.

[0109] Specifically, the perforations can pass through the first surface 86 and the second surface 88. The perforations are provided in the rectifying plate 26, and a perforated plate can be formed. With a proper opening rate, the perforated plate can reduce the noise inside the range hood 100. The specific opening rate can be determined through simulation or testing. In addition, the perforated plate can also have the effects of protecting the sound-absorbing structure, beautiful appearance, and the like.

[0110] In some embodiments, the range hood 100 includes a driving assembly 52 and a connecting assembly 54, the driving assembly 52 is connected to the flow guide assembly 14 through the connecting assembly 54, and the driving assembly 52 is used to drive the flow guide assembly 14 to move up and down through the connecting assembly 54. The range hood 100 is internally provided with an oil-proof cover 90, as shown in Figure 4 The oil-proof cover is located above the rectifying assembly 16 and covers at least part of the driving assembly 52 and the connecting assembly 54. In this way, the influence of the oil stains dripping inside the range hood 100 on the driving assembly 52 and the connecting assembly can be further reduced. In addition, the oil stains dripping inside the rack assembly 30 can be further guided to avoid dripping into the air inlet net.

[0111] Specifically, the oil-proof cover 90 can be fixed inside the rack assembly 30 and can be located between the rectifying assembly 16 and the volute 34. The oil-proof cover 90 can be generally in a U-shaped or V-shaped structure or other oil-proof structure. The opening of the oil-proof cover 90 faces downward, and in the length direction, the oil-proof cover 90 can cover the driving assembly 52 and the connecting assembly 54. The oil-proof cover 90 can guide the oil stains dripping from above the oil-proof cover 90 to the rectifying assembly 16 below, the rectifying plate 26 can then drip the oil stains and guide the oil stains to the oil cup 44, avoiding dripping into the air inlet net.

[0112] In summary, the range hood 100 of the embodiments of the present application can achieve the beneficial effects, including but not limited to:

[0113] 1. The rectifying assembly 16 can be rotatably movable and can dynamically rectify with the lifting of the flow guide assembly 14. It can correspondingly set a smaller flow-through space at low flow and match a larger flow-through space at high flow. Not only can it effectively reduce the vortex of the inlet air and improve the air performance, but also can effectively reduce the flow rate inside the rack and optimize the noise.

[0114] 2. The air inlet net forms an accelerated flow channel, accelerates the inlet air, and ensures the smoke suction effect.

[0115] 3. The rectifying plate 26 in a wedge-shaped structure is arranged at the lower end of the volute 34 and the inlet of the rack assembly 30, and forms a converging air inlet cross section at the inlet of the rack assembly 30, which can effectively reduce the directional radiation noise at the air inlet net.

[0116] 4. The rectifier assembly 16 is located on both sides of the drive assembly 52 and the connecting assembly 54, which can reduce the oil stains on the drive assembly 52 and the connecting assembly 54, enhance the service life of the connecting assembly 54, and reduce movement jamming, shaking, abnormal noise, etc. caused by oil stains.

[0117] 5. When the airflow guiding component 14 retracts, the first plate 48 can guide the oil stains inside the volute 34 and frame assembly 30, preventing oil stains from dripping through the air inlet mesh. The second plate 50 can effectively cover the mesh openings of the air inlet mesh, preventing users from seeing the inside of the range hood 100 through the air inlet mesh, thus improving the appearance. The second plate 50 can also guide condensed oil stains, preventing them from dripping through the air inlet mesh.

[0118] 6. Perforate the rectifier plate 26 and place sound-absorbing material on the rectifier plate 26 to further optimize the noise of the whole machine.

[0119] 7. The rectifier assembly 16 can also be configured asymmetrically, with the asymmetrical configuration achieved through independent movement control of the rectifier plate 26. This allows for targeted adjustment of the air intake on one side based on user needs, further ensuring optimal performance.

[0120] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0121] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A range hood, characterized in that, include: The main body contains a fan assembly; A flow guiding assembly is connected to the main body. The flow guiding assembly includes a flow guiding plate, and the flow guiding plate is provided with a smoke inlet. A rectifier assembly is located in the internal space enclosed by the main body and the airflow guiding assembly. The rectifier assembly includes a movable rectifier plate. A rectifier channel communicating with the smoke inlet is formed between the rectifier plate and the inner wall of the internal space. The rectifier plate is used to adjust the size of the flow space of the rectifier channel when it is in motion. In the direction of airflow, the rectifier channel has a shape that first increases, then decreases, and then increases again.

2. The range hood according to claim 1, characterized in that, The rectifier plate includes a first plate and a second plate, the first plate being rotatably connected to the body and the second plate, and the second plate being rotatably connected to the flow guiding assembly.

3. The range hood according to claim 2, characterized in that, The guide plate is provided with an air inlet mesh, the mesh area of ​​which forms the smoke inlet. The second plate and the air inlet mesh extend along the length of the range hood, and the length of the second plate is greater than or equal to the length of the air inlet mesh.

4. The range hood according to claim 1, characterized in that, The flow guiding assembly includes two flow guiding plates forming an included angle between them. The rectifier assembly includes two rectifier plates, with one rectifier plate and a corresponding flow guiding plate disposed on the same side of the range hood.

5. The range hood according to claim 4, characterized in that, Each of the air guide plates is provided with a first air inlet screen and a second air inlet screen in relatively fixed positions. The air guide component can switch between a first position and a second position relative to the main body. When the air guide component is in the first position, the first air inlet screen is exposed outside the main body and the second air inlet screen is hidden inside the main body. When the air guide component is in the second position, both the first air inlet screen and the second air inlet screen are exposed outside the main body. Both the first air inlet screen and the second air inlet screen are provided with the smoke inlet.

6. The range hood according to claim 4, characterized in that, The two rectifier plates are arranged symmetrically along the central axis of the width side of the range hood.

7. The range hood according to claim 4, characterized in that, The two rectifier plates form a wedge-shaped structure.

8. The range hood according to claim 4, characterized in that, The range hood includes a drive assembly and a connection assembly. The drive assembly is connected to the flow guide assembly through the connection assembly. The drive assembly is used to drive the flow guide assembly to move up and down through the connection assembly. At least a portion of the drive assembly and the connection assembly are located within the space enclosed by the two rectifier plates.

9. The range hood according to claim 1, characterized in that, The surface of the rectifier plate is provided with a sound-absorbing structure.

10. The range hood according to claim 9, characterized in that, The rectifier plate has perforations, and the sound-absorbing structure covers the perforations.

11. The range hood according to claim 1, characterized in that, The range hood includes a drive assembly and a connection assembly. The drive assembly is connected to the flow guiding assembly through the connection assembly. The drive assembly is used to drive the flow guiding assembly to move up and down through the connection assembly. The range hood is equipped with an oil-proof cover inside. The oil-proof cover is located above the flow guiding assembly and covers at least a part of the drive assembly and the connection assembly.

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