Smoke baffle driving structure and range hood

Abstract

The utility model relates to a kind of baffle drive structure and range hood.The baffle drive structure, including box, baffle and drive structure, baffle is rotatably connected in box, drive structure includes motor and connecting rod assembly;Connecting rod assembly includes crank and connecting rod, crank one end is fixed with output shaft, other end is articulated with connecting rod and forms first articulation point, the end of connecting rod away from crank is articulated with baffle and forms second articulation point;The distance L1 of the line between first articulation point and second articulation point to baffle rotation center in closed state is greater than or equal to 40mm;By using motor as power source, and by connecting rod assembly connection and driving baffle rotation, so that the distance L1 of the line between first articulation point and second articulation point to baffle rotation center in closed state is greater than or equal to 40mm, can significantly reduce the torque required by motor, reduce the situation that baffle is not closed tightly occurs.

Description

Technical Field

[0001] This utility model relates to the technical field of range hoods, and in particular to a smoke baffle drive structure and a range hood. Background Technology

[0002] As an important piece of equipment in modern kitchens, the design of the smoke baffle of a close-range suction range hood directly affects the efficiency of smoke absorption and the overall aesthetics of the machine.

[0003] Traditional near-suction models often use an electric push rod to drive the smoke baffle, which opens and closes by linear thrust. However, when the smoke baffle is closed, the lever arm from the center of rotation of the smoke baffle to the point of action of the electric push rod is short (usually only a few millimeters). This results in extremely high output requirements for the electric push rod, which can easily cause problems such as incomplete closure of the smoke baffle, reduced sealing, and even overload damage to the drive structure. Utility Model Content

[0004] Therefore, it is necessary to address the problem that the drive structure of traditional near-suction range hoods has a short lever arm when closed, which easily leads to problems such as incomplete closure of the smoke baffle and overload damage to the drive structure. A smoke baffle drive structure and range hood that can close tightly and have a smaller load on the drive structure should be provided.

[0005] This application provides a smoke baffle driving structure, including a housing, a smoke baffle, and a driving structure. The smoke baffle is rotatably connected to the housing. The driving structure includes a motor and a linkage assembly. The motor is fixed to the housing and drives the smoke baffle to switch between an open state and a closed state through the linkage assembly. The axis of the output shaft of the motor is parallel to the axis of the rotation center of the smoke baffle.

[0006] The connecting rod assembly includes a crank and a connecting rod. One end of the crank is fixed to the output shaft, and the other end is hinged to the connecting rod to form a first hinge point. The end of the connecting rod away from the crank is hinged to the smoke baffle to form a second hinge point.

[0007] In the closed state, the distance L1 from the line connecting the first hinge point and the second hinge point to the rotation center of the smoke baffle is greater than or equal to 40 mm.

[0008] In one embodiment, the smoke baffle is rotatably connected to the side plate of the housing, and the side plate is also fixed with a support base. The rotation center of the support base and the smoke baffle are located on the same reference plane, and the support base can abut against the smoke baffle to position it in a closed state.

[0009] In one embodiment, the crank and the output shaft are fixed to form a crank fixing point. In the closed state, the first hinge point is located behind the crank fixing point, and the second hinge point is located in front of the first hinge point. In the open state, the first hinge point is located in front of the crank fixing point, and the second hinge point is located in front of the first hinge point.

[0010] In one embodiment, the distance L1 from the line connecting the first hinge point and the second hinge point to the rotation center of the smoke baffle in the closed state is greater than the distance L2 from the line connecting the first hinge point and the second hinge point to the rotation center of the smoke baffle in the open state.

[0011] In one embodiment, the smoke baffle driving structure further includes a smoke baffle bracket, which is hinged to the housing and fixed to the smoke baffle. The connecting rod is located inside the smoke baffle bracket along the length of the housing and is hinged to the smoke baffle bracket to form the second hinge point.

[0012] In one embodiment, the connecting rod includes a first segment and a second segment forming an included angle. The second segment is hinged to the smoke baffle bracket to form a second hinge point. In the open state, the projection of the second segment along the length direction of the housing is completely located within the smoke baffle bracket.

[0013] In one embodiment, the drive structure further includes a hinge seat fixed to the housing; two bushings rotatably connected to the hinge seat are sleeved on the output shaft, wherein the first bushing is fixed to the output shaft, and there is a gap between the second bushing and the output shaft.

[0014] In one embodiment, the second bushing includes an annular baffle and a protrusion extending axially from the annular baffle. The protrusion includes a plurality of elastic buckles that can deform radially. The protrusion passes through the hinge seat to engage the hinge seat between the limiting protrusion of the elastic buckle and the annular baffle.

[0015] In one embodiment, the second bushing is made of plastic, and the gap between the inner diameter of the second bushing and the outer diameter of the output shaft is greater than or equal to 0.5 mm.

[0016] This application also provides a range hood, including the above-described smoke baffle drive structure.

[0017] The aforementioned smoke baffle drive structure uses a motor whose output shaft axis is parallel to the axis of the smoke baffle rotation center as a power source. The motor is connected to and drives the smoke baffle to rotate through a linkage assembly. This ensures that the distance L1 between the line connecting the first hinge point and the second hinge point in the closed state and the rotation center of the smoke baffle is greater than or equal to 40mm. This significantly reduces the torque required by the motor and reduces the occurrence of the smoke baffle not closing tightly. Attached Figure Description

[0018] Figure 1 This is a perspective view of the smoke baffle drive structure of this application in the open state;

[0019] Figure 2 This is a right view of the smoke baffle drive structure of this application with the side plate hidden in the closed state;

[0020] Figure 3 This is a schematic diagram showing the distance L1 from the line connecting the first hinge point and the second hinge point to the rotation center of the smoke baffle in the closed state.

[0021] Figure 4 This is a schematic diagram showing the distance L2 from the line connecting the first hinge point and the second hinge point to the center of rotation of the smoke baffle in the open state.

[0022] Figure 5 for Figure 4 A 3D view of the location of the drive structure.

[0023] Reference numerals: 100, housing; 110, side plate; 120, top plate; 200, smoke baffle; 300, drive structure; 310, motor; 311, output shaft; 320, connecting rod assembly; 321, crank; 322, connecting rod; 322a, first section; 322b, second section; 323, first hinge point; 324, second hinge point; 325, crank fixing point; 330, hinge seat; 340, second bushing; 341, annular baffle; 342, protrusion; 343, elastic buckle; 400, support seat; 500, smoke baffle bracket. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0025] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0030] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, this application provides a smoke baffle driving structure, including a housing 100, a smoke baffle 200, and a driving structure 300. The smoke baffle 200 is rotatably connected to the housing 100. The driving structure 300 includes a motor 310 and a linkage assembly 320. The motor 310 is fixed to the housing 100 and drives the smoke baffle 200 to switch between an open state and a closed state through the linkage assembly 320. The axis of the output shaft 311 of the motor 310 is parallel to the axis of rotation of the smoke baffle 200. The axes of the heart are parallel; the connecting rod assembly 320 includes a crank 321 and a connecting rod 322. One end of the crank 321 is fixed to the output shaft 311, and the other end is hinged to the connecting rod 322 to form a first hinge point 323. The end of the connecting rod 322 away from the crank 321 is hinged to the smoke baffle 200 to form a second hinge point 324. In the closed state, the distance L1 from the line connecting the first hinge point 323 and the second hinge point 324 to the rotation center of the smoke baffle 200 is greater than or equal to 40mm.

[0031] In this application, by using a motor 310 whose output shaft 311 axis is parallel to the axis of the rotation center of the smoke baffle 200 as a power source, and connecting and driving the smoke baffle 200 to rotate through a connecting rod assembly 320, the distance L1 from the line connecting the first hinge point 323 and the second hinge point 324 to the rotation center of the smoke baffle 200 in the closed state is greater than or equal to 40mm, which can significantly reduce the torque required by the motor 310 and reduce the occurrence of the smoke baffle 200 not closing tightly.

[0032] Specifically, when the motor 310 is running, its output shaft 311 drives the crank 321 to rotate, and the rotational motion is converted into the reciprocating swing of the smoke baffle 200 through the connecting rod 322, thereby realizing the switching between the closed and open states.

[0033] It should be understood that, according to the principle of mechanics (M=F×L), the torque (M) is determined by the driving force (F) and the lever arm (L). In this application, the output shaft 311 and the crank 321 fixed to the output shaft 311 can be regarded as a whole. Therefore, the first hinge point 323 on the crank 321 can be regarded as the actual force application point of the motor 310. That is to say, the position of the force application point of the motor 310 can be changed by the crank 321, thereby significantly increasing the equivalent lever arm length between the motor 310 and the rotation center of the smoke baffle 200 (compared to the short lever arm structure of the traditional electric push rod linear drive), thereby increasing the torque of the motor 310 on the smoke baffle 200.

[0034] Of course, in some other embodiments, L1 can also be adjusted adaptively according to different actual conditions (such as the size of the space available to accommodate the motor 310 in the equipment, equipment cost, weight of the smoke baffle 200, etc.). For example, when the smoke baffle 200 is relatively light, L1 can also be less than 40mm, as long as the smoke baffle 200 can be closed tightly within the rated power range of the motor 310.

[0035] Specifically, motor 310 is a worm gear reducer motor.

[0036] It should be noted that in traditional designs, the rotation centers of the support base 400 and the smoke baffle 200 are mounted on different parts (for example, the support base 400 is located on the side plate 110, while the smoke baffle 200 is rotatably connected to the top plate 120). Due to the accumulation of multiple datum tolerances, such structures have alignment deviations when the smoke baffle 200 is closed, which can easily lead to single-sided gaps and make it difficult to close tightly.

[0037] In this regard, please refer to Figure 1 as well as Figure 3 As shown, in some embodiments, the smoke baffle 200 is rotatably connected to the side plate 110 of the housing 100. The side plate 110 is also fixed with a support 400. The rotation center of the support 400 and the smoke baffle 200 are located on the same reference plane. The support 400 can abut against the smoke baffle 200 to position it in the closed state.

[0038] By setting both the support base 400 and the smoke baffle 200 on the side plate 110, the rotation center of the smoke baffle 200 and the support point of the smoke baffle 200 when it is closed are unified on the same reference plane. In other words, the two references are unified, thereby avoiding tolerance accumulation and preventing the smoke baffle 200 from having a single-sided gap when it is closed.

[0039] In some embodiments, the surface of the support base 400 is provided with a damping layer to reduce the impact noise when the smoke baffle 200 is closed, while providing elastic compensation to eliminate gaps caused by machining tolerances.

[0040] For ease of description, in this application, the side where the front of the range hood is located is defined as the front side, the side where the back is located is defined as the rear side, and the horizontal direction of the front of the range hood is defined as the length direction of the housing 100.

[0041] Please combine Figure 3 as well as Figure 4 As shown, in some embodiments, the crank 321 and the output shaft 311 are fixed to form a crank fixing point 325. In the closed state, the first hinge point 323 is located behind the crank fixing point 325, and the second hinge point 324 is located in front of the first hinge point 323. In the open state, the first hinge point 323 is located in front of the crank fixing point 325, and the second hinge point 324 is located in front of the first hinge point 323.

[0042] Specifically, when the smoke baffle 200 is closed, the crank 321 moves along... Figure 3 Rotate clockwise around the output shaft 311 so that the first hinge point 323 is located behind the crank fixing point 325 (i.e., the output shaft 311). In other words, when the smoke baffle 200 is closed, the crank 321 folds and retracts towards the rear of the housing 100 to achieve a compact spatial layout of the connecting rod assembly 320, improving the utilization of the internal space of the housing 100 while reducing the risk of interference.

[0043] Please combine Figure 3 as well as Figure 4 As shown, in some embodiments, the distance L1 from the line connecting the first hinge point 323 and the second hinge point 324 to the rotation center of the smoke baffle 200 in the closed state is greater than the distance L2 from the line connecting the first hinge point 323 and the second hinge point 324 to the rotation center of the smoke baffle 200 in the open state.

[0044] By adjusting the distance between the line connecting the first hinge point 323 and the second hinge point 324 and the rotation center of the smoke baffle 200, a non-linear change in the lever arm length is achieved, so as to form a long lever arm in the closed state, enhance the closing torque, and ensure that the smoke baffle 200 can be closed tightly in the closed state.

[0045] Please combine Figure 1 as well as Figure 3 As shown, in some embodiments, the smoke baffle drive structure further includes a smoke baffle bracket 500, which is hinged to the housing 100 and fixed to the smoke baffle 200. The connecting rod 322 is located inside the smoke baffle bracket 500 (near the air inlet of the housing 100) along the length of the housing 100.

[0046] Specifically, the smoke baffle 200 is indirectly hinged to the housing 100 through the smoke baffle bracket 500. The smoke baffle bracket 500 is L-shaped, with its horizontal part fixed to the smoke baffle 200 with screws, and its vertical part provided with hinge holes for rotatably connecting with the rotating shaft assembly on the side plate 110.

[0047] The smoke baffle bracket 500 unifies the rotation center of the smoke baffle 200 and the second hinge point 324 of the drive mechanism to the same reference plane (side plate 110), thus avoiding deviations in the motion trajectory caused by installation tolerances.

[0048] More specifically, the side plates 110 on both sides of the housing 100 are hinged with smoke baffle brackets 500, one of which is hinged to the connecting rod 322. The two ends of the smoke baffle 200 along the length of the housing 100 are fixed to the two smoke baffle brackets 500 respectively, thereby eliminating the unilateral eccentric torque as much as possible and improving the stability of the smoke baffle 200 when rotating.

[0049] Please combine Figure 1 as well as Figure 3 As shown, in some embodiments, the connecting rod 322 includes a first segment 322a and a second segment 322b forming an included angle. The second segment 322b is hinged to the smoke baffle bracket 500 to form a second hinge point 324. In the open state, the projection of the second segment 322b along the length of the housing 100 is completely located within the smoke baffle bracket 500, so that in the open state, the second segment 322b is completely hidden within the smoke baffle bracket 500, reducing the number of moving parts exposed on the front of the housing 100, improving the overall aesthetics of the equipment, and also reducing the risk of oil accumulation.

[0050] In addition, the two-stage design enables the crank 321 to drive the first stage 322a of the connecting rod to drive the second stage 322b to perform a compound motion with an elliptical trajectory, so that the second hinge point 324 will generate secondary deceleration when it is close to the closed state, thereby achieving a torque amplification effect.

[0051] Specifically, the angle between the first segment 322a and the second segment 322b ranges from 120° to 160°. Preferably, the angle between the first segment 322a and the second segment 322b is 145°.

[0052] Please combine Figure 4 as well as Figure 5 As shown, in some embodiments, the drive structure 300 further includes a hinge seat 330 fixed to the housing 100; two bushings rotatably connected to the hinge seat 330 are sleeved on the output shaft 311, wherein the first bushing is fixed to the output shaft 311, and there is a gap between the second bushing 340 and the output shaft 311.

[0053] Specifically, a first bushing and a second bushing 340 are respectively fitted at both ends of the output shaft 311. The first bushing is interference-fitted with the output shaft 311 and fixed near the motor 310 to provide main support. The second bushing 340 is clearance-fitted with the output shaft 311 (clearance ≥ 0.5 mm) and fixed on the hinge seat 330 on the side away from the motor 310 to form floating support.

[0054] It is understandable that when the motor shaft undergoes eccentric deformation due to the cyclic load of the crank 321, the clearance design of the second bushing 340 can adaptively accommodate the offset and avoid hard friction.

[0055] Compared to traditional single-sleeve support structures, where radial runout of the motor output shaft can easily lead to motion jamming, and where double-rigid-sleeve designs are prone to shaft-hole interference due to machining errors or installation deviations, resulting in abnormal noise and motor overload, this application provides stable support while allowing for adaptive fine-tuning through a differentiated sleeve fit design, thereby ensuring smooth operation of the output shaft 311.

[0056] In some embodiments, the second bushing 340 is made of a material with a thermal expansion coefficient that differs greatly from that of the output shaft 311 (such as a combination of POM and steel shaft), and the gap is adjusted adaptively by temperature difference to prevent jamming due to thermal expansion and contraction.

[0057] Please refer to Figure 5 As shown, in some embodiments, the second bushing 340 includes an annular baffle 341 and a protrusion 342 protruding axially from the annular baffle 341. The protrusion 342 includes a plurality of elastic buckles 343 that can deform radially. The protrusion 342 passes through the hinge seat 330 to engage the hinge seat 330 between the limiting protrusion of the elastic buckle 343 and the annular baffle 341. Compared with traditional fixing methods such as bolt connection, it can effectively improve installation efficiency.

[0058] Specifically, during the assembly process, the protrusion 342 is aligned with the shaft hole of the hinge seat 330, and pressure is applied to make it pass through the shaft hole of the hinge seat 330. After the elastic buckle 343 passes through the shaft hole, it automatically opens and clamps the hinge seat 330 through the limiting barb and the annular baffle 341 to achieve axial locking.

[0059] In some embodiments, the second bushing 340 is made of plastic, and the gap between the inner diameter of the second bushing 340 and the outer diameter of the output shaft 311 is greater than or equal to 0.5 mm. Preferably, the second bushing 340 is made of POM (polyoxymethylene).

[0060] It is understandable that dry friction can easily occur between the bushing and the output shaft 311 due to lubrication deterioration. While plastic materials can have both self-lubricating properties and deformation compensation capabilities, precise matching of the clearance is required to prevent loosening or jamming. Therefore, in this application, a second bushing 340 made of plastic is selected, and the clearance between the inner diameter of the second bushing 340 and the outer diameter of the output shaft 311 is controlled to be greater than or equal to 0.5 mm. This ensures that when the eccentricity of the output shaft 311 reaches 0.5 mm, the second bushing 340 contacts the output shaft 311 and plays a limiting and lubricating role, limiting further eccentricity of the output shaft 311, thereby effectively solving the problem of jamming when the output shaft 311 is double-supported.

[0061] This application also provides a range hood, including the above-described smoke baffle drive structure.

[0062] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A smoke baffle driving structure, characterized in that, The device includes a housing (100), a smoke baffle (200), and a drive structure (300). The smoke baffle (200) is rotatably connected to the housing (100). The drive structure (300) includes a motor (310) and a linkage assembly (320). The motor (310) is fixed to the housing (100) and drives the smoke baffle (200) to switch between an open state and a closed state through the linkage assembly (320). The axis of the output shaft (311) of the motor (310) is parallel to the axis of the rotation center of the smoke baffle (200). The connecting rod assembly (320) includes a crank (321) and a connecting rod (322). One end of the crank (321) is fixed to the output shaft (311), and the other end is hinged to the connecting rod (322) to form a first hinge point (323). The end of the connecting rod (322) away from the crank (321) is hinged to the smoke baffle (200) to form a second hinge point (324). In the closed state, the distance L1 between the line connecting the first hinge point (323) and the second hinge point (324) and the rotation center of the smoke baffle (200) is greater than or equal to 40mm.

2. The smoke baffle driving structure according to claim 1, characterized in that, The smoke baffle (200) is rotatably connected to the side plate (110) of the housing (100). The side plate (110) is also fixed with a support base (400). The rotation center of the support base (400) and the smoke baffle (200) are located on the same reference plane. The support base (400) can abut against the smoke baffle (200) to position it in the closed state.

3. The smoke baffle driving structure according to claim 1, characterized in that, The crank (321) and the output shaft (311) are fixed to form a crank fixing point (325). In the closed state, the first hinge point (323) is located behind the crank fixing point (325), and the second hinge point (324) is located in front of the first hinge point (323). In the open state, the first hinge point (323) is located in front of the crank fixing point (325), and the second hinge point (324) is located in front of the first hinge point (323).

4. The smoke baffle driving structure according to claim 1, characterized in that, In the closed state, the distance L1 between the line connecting the first hinge point (323) and the second hinge point (324) to the rotation center of the smoke baffle (200) is greater than the distance L2 between the line connecting the first hinge point (323) and the second hinge point (324) to the rotation center of the smoke baffle (200) in the open state.

5. The smoke baffle driving structure according to claim 1, characterized in that, The smoke baffle drive structure also includes a smoke baffle bracket (500), which is hinged to the housing (100) and fixed to the smoke baffle (200). The connecting rod (322) is located inside the smoke baffle bracket (500) along the length direction of the housing (100) and is hinged to the smoke baffle bracket (500) to form the second hinge point (324).

6. The smoke baffle driving structure according to claim 5, characterized in that, The connecting rod (322) includes a first segment (322a) and a second segment (322b) forming an included angle. The second segment (322b) is hinged to the smoke baffle bracket (500) to form the second hinge point (324). In the open state, the projection of the second segment (322b) along the length direction of the box (100) is completely located within the smoke baffle bracket (500).

7. The smoke baffle driving structure according to claim 1, characterized in that, The drive structure (300) also includes a hinge seat (330) fixed to the housing (100). Two bushings that are rotatably connected to the hinge seat (330) are sleeved on the output shaft (311). The first bushing is fixed to the output shaft (311), and there is a gap between the second bushing (340) and the output shaft (311).

8. The smoke baffle driving structure according to claim 7, characterized in that, The second bushing (340) includes an annular baffle (341) and a protrusion (342) protruding axially from the annular baffle (341). The protrusion (342) includes a plurality of elastic buckles (343) that can deform radially. The protrusion (342) passes through the hinge seat (330) to engage the hinge seat (330) between the limiting protrusion of the elastic buckle (343) and the annular baffle (341).

9. The smoke baffle driving structure according to claim 7, characterized in that, The second bushing (340) is made of plastic, and the gap between the inner diameter of the second bushing (340) and the outer diameter of the output shaft (311) is greater than or equal to 0.5 mm.

10. A range hood, characterized in that, Includes the smoke baffle driving structure as described in any one of claims 1 to 9.

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