Fan device and extractor hood

Abstract

The utility model relates to a range hood technology field, more particularly, a kind of fan device and range hood.The fan device includes air guide main body, axial impeller, centrifugal impeller and drive assembly;Air guide main body is equipped with guide channel, and axial impeller and centrifugal impeller are rotatably arranged in guide channel, and sequentially arranged along the flow direction of airflow in guide channel;Drive assembly is connected with air guide main body, and is transmission connection with axial impeller and centrifugal impeller.The fan device is applied to range hood, it can improve the wind pressure and working wind volume of range hood, reduce operating noise, improve the effect that range hood resists public flue back pressure capacity and sucks cooking oil smoke.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and more specifically, to a fan device and a range hood. Background Technology

[0002] Conventional range hoods typically use multi-blade centrifugal fans as their power source. During peak kitchen usage times, when the back pressure in the shared exhaust duct is high, it's difficult to overcome the exhaust resistance at the rear, resulting in insufficient airflow and increased operating noise. This directly impacts the range hood's smoke extraction performance and the user experience. Furthermore, due to the limitations of the range hood's casing size, it's usually necessary to increase the centrifugal fan speed to further enhance its performance. This leads to increased aerodynamic noise from the fan, negatively affecting the user experience. Utility Model Content

[0003] The purpose of this utility model is to provide a fan device and a range hood that can improve the working wind pressure and working air volume of the range hood, reduce operating noise, enhance the range hood's ability to resist back pressure in the public flue, and improve the effect of removing cooking fumes.

[0004] The embodiments of this utility model can be implemented as follows: In a first aspect, this utility model provides a fan device, which includes an air guide body, an axial flow impeller, a centrifugal impeller, and a drive assembly; The air guide body is equipped with a flow guide channel, and both the axial flow impeller and the centrifugal impeller are rotatably installed in the flow guide channel and are arranged sequentially along the flow direction of the airflow in the flow guide channel; The drive assembly is connected to the air guide body and is also connected to the axial impeller and centrifugal impeller drive.

[0005] In an optional embodiment, the air guide body includes an air guide tube, an axial flow housing, and a centrifugal volute. The axial flow housing and the centrifugal volute are connected to both ends of the air guide tube and are both connected to the air guide tube to form a flow channel; The axial flow casing is equipped with an air inlet, and the centrifugal volute is equipped with an air outlet. The air inlet direction is perpendicular to the air outlet direction.

[0006] In an optional implementation, the drive assembly includes a drive unit, a first transmission member, and a second transmission member; The drive unit is connected to the air duct, and the drive unit is connected to the axial impeller via the first transmission component, and the drive unit is connected to the centrifugal impeller via the second transmission component.

[0007] In an optional embodiment, the drive unit includes a drive motor, and both the first transmission component and the second transmission component are drive-connected to the drive motor; or, the drive unit includes two drive motors, one of which is drive-connected to the first transmission component, and the other drive motor is drive-connected to the second transmission component.

[0008] In an optional embodiment, the fan device further includes rectifier blades disposed within the air guide body, the rectifier blades being provided with a mounting portion for mounting the drive unit.

[0009] In an optional embodiment, the first transmission component includes a first transmission shaft; the second transmission component includes a second transmission shaft and at least one rotating bracket, the rotating bracket being disposed inside the air guide duct, and the second transmission shaft being rotatably connected to the rotating bracket.

[0010] In an optional embodiment, one or both of the first and second drive shafts are connected to the drive unit via a speed change mechanism.

[0011] In an optional implementation, the air inlet is provided with an outwardly flared arc-shaped opening.

[0012] In an optional implementation, a filter module is provided inside the air duct.

[0013] Secondly, this utility model provides a range hood, which includes a range hood body, a smoke collection hood, a check valve, and the aforementioned fan device; The smoke hood and fan unit are both connected to the main body of the smoke machine. The smoke hood is connected to the air inlet of the guide channel, and the check valve is connected to the fan unit and the air outlet of the guide channel.

[0014] The beneficial effects of the fan device and range hood provided in this embodiment of the present invention include: This fan unit includes an air guide body, an axial impeller, a centrifugal impeller, and a drive assembly. The air guide body has a flow channel, within which both the axial and centrifugal impellers are rotatably mounted and arranged sequentially along the airflow direction within the channel. The drive assembly is connected to the air guide body and is also connected to the axial and centrifugal impellers via a transmission connection. This fan unit is used in range hoods, and it can increase the operating air pressure and air volume of the range hood, reduce operating noise, improve the range hood's resistance to back pressure from shared flues, and enhance the effectiveness of removing cooking fumes. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a cross-sectional view of the fan unit provided in this embodiment; Figure 2 This is a schematic diagram of the structure of the fan device provided in this embodiment; Figure 3 This is a schematic diagram of the structure of the range hood provided in this embodiment; Figure 4 This is a cross-sectional view of the range hood provided in this embodiment.

[0017] Icons: 100-Fan unit; 110-Air guide body; 120-Axial flow impeller; 130-Centrifugal impeller; 140-Drive assembly; 111-Air guide channel; 112-Air guide tube; 113-Axial flow casing; 114-Centrifugal volute; 115-Air inlet; 116-Air outlet; 141-Drive motor; 142-First drive shaft; 143-Second drive shaft; 144-Rotating bracket; 117-Rectifying blades; 118-Mounting part; 119-Arc-shaped flare; 200-Range hood; 210-Range hood body; 220-Smoke hood; 230-Check valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0019] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0020] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0021] In the description of this utility model, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0022] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0023] It should be noted that, where there is no conflict, the features in the embodiments of this utility model can be combined with each other.

[0024] The inventors discovered through research that range hoods use a built-in fan system to rotate and exhaust cooking fumes into a shared exhaust duct. However, for a stable fan system, higher back pressure inevitably leads to lower exhaust volume. As modern residential buildings become increasingly taller, more users are sharing the same exhaust duct, especially during peak kitchen usage times. This causes a surge in back pressure, directly reducing the range hood's performance and affecting its fume extraction efficiency. Conventional range hoods typically use multi-blade centrifugal fans as their power source. During peak kitchen usage times and when back pressure in the shared exhaust duct is high, these fans struggle to overcome the exhaust resistance at the rear, resulting in lower airflow and higher operating noise, directly impacting fume extraction and user experience. Furthermore, due to the limitations of the range hood's casing size, increasing the centrifugal fan speed is often necessary to further enhance its performance, leading to increased aerodynamic noise and negatively impacting the user experience.

[0025] Furthermore, based on the principle that multiple fans operating in series can accumulate working air pressure under the same working air volume, existing technologies also include range hoods with two fans in series. This uses two fans as the power source for the range hood, achieving higher working air pressure while maintaining relatively low fan speeds. However, this type of range hood with two built-in fans has a more complex internal flow channel, leading to additional flow losses and aerodynamic noise, while also increasing costs and hindering energy conservation.

[0026] For the reasons mentioned above, please refer to Figure 1 and Figure 2 This embodiment provides a fan device 100, which includes a guide body 110, an axial impeller 120, a centrifugal impeller 130, and a drive assembly 140. The air guide body 110 is provided with a flow guide channel 111. The axial flow impeller 120 and the centrifugal impeller 130 are rotatably arranged in the flow guide channel 111 and are arranged sequentially along the flow direction of the airflow in the flow guide channel 111. The drive assembly 140 is connected to the air guide body 110 and is also connected to the axial impeller 120 and the centrifugal impeller 130.

[0027] Please refer to Figure 1 and Figure 2 and combined Figure 3 and Figure 4 The working principle of the fan unit 100 is as follows: The fan device 100 is used in the range hood 200. Its function is to generate negative pressure during operation, thereby drawing in the cooking fumes and expelling them from the room through the air duct and exhaust pipe. The fan unit 100 includes a guide body 110, an axial impeller 120, a centrifugal impeller 130, and a drive assembly 140. The guide body 110 has a guide channel 111, through which the oil fumes drawn in during operation flow towards the air duct. The axial impeller 120 and the centrifugal impeller 130 are rotatably arranged in the guide channel 111 and are arranged sequentially along the flow direction of the airflow in the guide channel 111. The drive assembly 140 is connected to the guide body 110 and is driven by the axial impeller 120 and the centrifugal impeller 130, thereby driving the axial impeller 120 and the centrifugal impeller 130 to rotate in the guide channel 111. Since the axial impeller 120 and the centrifugal impeller 130 are arranged sequentially along the airflow direction in the guide channel 111, that is, the axial impeller 120 is close to the air inlet end of the guide channel 111, in this way, the axial impeller 120 can be arranged closer to the smoke inlet of the smoke hood 220, thereby further reducing the height of the negative pressure zone of the smoke inlet and improving the smoke extraction effect; while the centrifugal impeller 130 is close to the exhaust end of the guide channel 111, so as to adjust its exhaust direction, so that the exhaust high-speed smoke can smoothly enter the common flue without bending, which can reduce the flow loss in the exhaust pipe and reduce aerodynamic noise. In summary, since the fan device 100 adopts the method of simultaneously setting axial flow impeller 120 and centrifugal impeller 130, and the axial flow impeller 120 has a large working air volume and the centrifugal impeller 130 has a high working air pressure, the fan device 100, when applied to the range hood 200, can improve the working air pressure and working air volume of the range hood, reduce operating noise, improve the range hood's ability to resist the back pressure of the public flue, and enhance the effect of removing cooking fumes.

[0028] Further, please refer to Figures 1-4In this embodiment, when configuring the air guide body 110, its function is to form a flow channel 111 to guide the flow of flue gas, and it can also be used to install the axial flow impeller 120, the centrifugal impeller 130 and the drive assembly 140. Based on this, the air guide body 110 of this embodiment includes an air guide tube 112, an axial flow housing 113 and a centrifugal volute 114. The axial flow housing 113 and the centrifugal volute 114 are connected to both ends of the air guide duct 112 and are both connected to the air guide duct 112 to form the air guide channel 111; The axial flow housing 113 is provided with an air inlet 115, and the centrifugal volute 114 is provided with an air outlet 116. The air inlet 115 is oriented in the direction of air intake (e.g., ...). Figure 2 The direction indicated by the middle arrow A) and the exhaust direction of the exhaust vent 116 (as shown by the middle arrow A) are similar. Figure 2 (The direction indicated by the middle arrow B) is perpendicular.

[0029] Thus, through the above structural arrangement, the axial flow housing 113 and the centrifugal volute 114 can be connected to both ends of the air guide duct 112 by the relative positions of the axial flow impeller 120 and the centrifugal impeller 130 in the guide channel 111. Moreover, the axial flow housing 113 and the centrifugal volute 114 are guided by the air guide duct 112, thereby simplifying the flue gas passage inside the fan device 100, reducing the air guide resistance, and the air guide duct 112 can also be used to install the drive assembly 140, thereby simplifying the installation of the drive assembly 140 and simplifying the overall structure of the fan device 100.

[0030] It should be noted that traditional fume extraction systems generally use multi-blade centrifugal fans as the power source and usually adopt a structure arrangement that keeps the air outlet vertical. This means that the exhaust airflow, after being accelerated by the fan, needs to pass through a bend before entering the common flue, resulting in significant flow loss and increased aerodynamic noise.

[0031] Based on the above, in this embodiment, the air inlet 115 of the axial flow housing 113 is perpendicular to the air outlet 116 of the centrifugal volute 114. That is, with the air guide duct 112 vertically arranged and the axial flow housing 113 and centrifugal volute 114 located at opposite ends, the centrifugal volute 114 adopts a transverse arrangement. This allows the high-speed flue gas from the exhaust outlet to smoothly enter the common flue without bending, reducing flow losses in the exhaust pipe and lowering aerodynamic noise. Therefore, in operation, when the drive assembly 140 drives the centrifugal impeller 130 to rotate, it can further increase the working air pressure and convert the upward gas movement direction to the direction along the exhaust outlet 116 on the transversely placed centrifugal volute 114.

[0032] Please refer to Figures 1-4 When the drive assembly 140 is configured, its function is to drive the axial flow impeller 120 and the centrifugal impeller 130 to rotate in the guide channel 111. Based on this, the drive assembly 140 includes a drive unit, a first transmission component and a second transmission component. The drive unit is connected to the air duct 112, and the drive unit is connected to the axial flow impeller 120 through the first transmission component, and the drive unit is connected to the centrifugal impeller 130 through the second transmission component.

[0033] Furthermore, based on the above structure, the drive unit serves as a power source to drive the axial impeller 120 and the centrifugal impeller 130 to rotate in the guide channel 111. Therefore, depending on the usage requirements, the axial impeller 120 and the centrifugal impeller 130 can be driven independently or connected in series through the same power source. That is, when configuring the drive unit, it can include one drive motor 141 as needed, and both the first transmission component and the second transmission component are connected to the drive motor 141. In other words, the axial impeller 120 and the centrifugal impeller 130 are driven by the operation of one drive motor 141. Alternatively, the drive unit can include two drive motors 141, one of which is connected to the first transmission component, and the other is connected to the second transmission component. In other words, the axial impeller 120 and the centrifugal impeller 130 are driven independently.

[0034] In this embodiment, a drive motor 141 is used to drive the first transmission component and the second transmission component to rotate the axial impeller 120 and the centrifugal impeller 130. This configuration simplifies the structure of the drive assembly 140 and realizes the series connection of the axial impeller 120 and the centrifugal impeller 130, thereby reducing its operating cost.

[0035] When installing the aforementioned drive motor 141, this embodiment employs a fan device 100 that also includes rectifier blades 117 disposed within the air guide body 110. Specifically, these blades can be connected to the air guide duct 112, the axial flow housing 113, or the centrifugal volute 114. Furthermore, the rectifier blades 117 are provided with a mounting portion 118 for mounting the drive unit. The mounting portion 118 can be a support or mounting hole located at the center of the hub of the rectifier blades 117. Thus, by configuring the air guide body 110, it can both guide and rectify airflow within the air guide duct 112 and also serve to mount the drive motor 141, thereby reducing the resistance of the drive motor 141 to the airflow within the air guide duct 112.

[0036] Please refer to Figures 1-4In this embodiment, the first transmission component, when configuring the first and second transmission components, includes a first transmission shaft 142; while the second transmission component includes a second transmission shaft 143 and at least one rotating bracket 144. The rotating bracket 144 is disposed within the air guide duct 112, and the second transmission shaft 143 is rotatably connected to the rotating bracket 144. That is, both the first and second transmission components adopt a transmission shaft configuration to simplify their transmission structure. Furthermore, since the rectifier blades 117 are relatively close to the axial flow impeller 120, the distance between the drive motor 141 and the axial flow impeller 120 is smaller than the distance between the drive motor 141 and the centrifugal impeller 130. Therefore, at least one rotating bracket 144 is provided within the air guide duct 112 to improve the stability of the second transmission shaft 143. Moreover, multiple rotating brackets 144 can be provided along the axis of the air guide duct 112.

[0037] In addition, in the embodiments of this utility model, when the axial impeller 120 and the centrifugal impeller 130 are driven to rotate by a drive motor 141, they can rotate synchronously or differentially. Based on this, one or both of the first drive shaft 142 and the second drive shaft 143 are connected to the drive unit through a speed change mechanism. That is, a speed change mechanism can be provided at the connection between the first drive shaft 142 and the drive motor 141 or at the connection between the second drive shaft 143 and the drive motor 141 as needed to adjust their rotation speed, thereby meeting the requirements of air volume and air pressure of the cylinder.

[0038] Therefore, in conjunction with the above, it can be seen that in the embodiments of this utility model, direct transmission with the drive unit can be achieved by configuring the first drive shaft 142 and the second drive shaft 143 as described above. Alternatively, a speed-changing mechanism can be set at the connection between the first drive shaft 142 and the drive motor 141 or at the connection between the second drive shaft 143 and the drive motor 141 to adjust its rotation speed, thereby achieving indirect transmission. In this way, the drive assembly 140 can achieve transmission connection with the axial impeller 120 and the centrifugal impeller 130 through various transmission connection methods.

[0039] Furthermore, as can be seen from the above, its axial impeller 120 is arranged closer to the smoke inlet of the smoke collection hood 220, which can further reduce the height of the negative pressure zone of the smoke inlet and thus improve the smoke extraction effect. That is, its axial casing 113 is located near the smoke collection hood 220 of the air guide body 110. Therefore, in order to improve its smoke collection function, an outward arc-shaped flare 119 is provided at the air inlet 115 of the axial casing 113. Furthermore, in configuring the aforementioned rectifier blades 117, this embodiment adopts the method of installing them on the axial flow housing 113, thereby enabling both the axial flow impeller 120 and the rectifier blades 117 to be installed on the axial flow housing 113, and providing an outwardly flared arc-shaped vent 119 at its air inlet 115. Thus, when the axial flow impeller 120 is in working state, the drive motor 141 drives the axial flow impeller 120 to rotate and do work, thereby forming a negative pressure zone. The rectifier blades 117 have the function of rectifying, diffuser and decelerating the flowing gas in the axial flow housing 113, and the arc-shaped vent 119 design at the lower end of the axial flow housing 113 further enhances the suction effect.

[0040] In order to improve the filtration effect of flue gas, a filter module is installed inside the air duct 112.

[0041] In summary, the fan unit 100 adopts a series combination of axial impeller 120 and centrifugal impeller 130, which can effectively improve the working air pressure and air volume of the range hood, enhance its resistance to back pressure of the common flue, and improve the effect of removing cooking fumes. Moreover, its centrifugal volute 114 adopts a transverse arrangement structure, which can effectively reduce the flow loss of high-speed flue gas in the exhaust pipe. Furthermore, the axial impeller 120 is arranged closer to the smoke inlet of the smoke collection hood 220, which can further reduce the height of the negative pressure zone at the smoke inlet, which is conducive to improving the smoke extraction effect. In addition, the axial impeller 120 and the centrifugal impeller 130 are driven by the same power source, which is conducive to cost reduction and energy saving, coordinated control, and the drive motor 141 is installed in the mounting part 118 of the rectifier blade 117, which has little obstruction to the internal flue gas flow, reduces impact noise, and can also reduce the blockage of the centrifugal impeller 130 inlet, thereby improving working efficiency and improving the heat dissipation environment of the drive motor 141, thus further extending its service life.

[0042] Based on the above, please refer to Figures 1-4 This embodiment also provides a range hood 200, which includes a range hood body 210, a smoke collection hood 220, a check valve 230, and the aforementioned fan device 100. The smoke collection hood 220 and the fan device 100 are both connected to the range hood body 210, and the smoke collection hood 220 is connected to the air inlet 115 of the guide channel 111. The check valve 230 is connected to the fan device 100 and is connected to the air outlet of the guide channel 111.

[0043] When the range hood 200 is running, the axial impeller 120 and centrifugal impeller 130 generate suction as they rotate. The oil fume airflow enters the range hood from the smoke inlet located at the lower end of the smoke collection hood 220. It first enters the axial casing 113, and under the action of the axial impeller 120 and the rectifier blades 117, it rotates, accelerates, diffuses, and rectifies. Then, it enters the centrifugal volute 114 through the guide duct 112. The oil fume airflow is again accelerated by the rotation of the centrifugal impeller 130 and diffused by the centrifugal volute 114, and finally discharged to the outside area of ​​the range hood through the outlet of the check valve 230.

[0044] By employing the aforementioned fan device 100, the range hood 200 can simultaneously utilize an axial impeller 120 and a centrifugal impeller 130, thereby increasing the working air pressure and air volume, reducing operating noise, enhancing the range hood's resistance to back pressure in the common flue, and improving the effectiveness of removing cooking fumes. Furthermore, the axial impeller 120 is positioned closer to the smoke inlet of the smoke collection hood 220, which can further reduce the height of the negative pressure zone at the smoke inlet, thereby improving the smoke extraction effect. Furthermore, the axial impeller 120 and the centrifugal impeller 130 share the same drive motor 141, which simplifies the drive structure, reduces manufacturing costs and power consumption, and makes it easier to coordinate and control the fan while combining two different impeller structures. Moreover, the drive motor 141 is located on the rectifier blades 117, which reduces obstruction to the internal flue gas flow, reduces impact noise, and since the drive motor 141 is located in the guide channel 111 of the air duct 112, its heat dissipation environment is good, which can further improve its service life. Based on the configuration of the axial impeller 120 and centrifugal impeller 130 described above, an axial flow housing 113 and a centrifugal volute 114 are respectively installed on the air guide duct 112. At this time, the air inlet 115 of the axial flow housing 113 can be perpendicular to the air outlet 116 of the centrifugal volute 114. That is, with the air guide duct 112 set vertically and the axial flow housing 113 and the centrifugal volute 114 located at its two ends, the centrifugal volute 114 adopts a horizontal arrangement structure. The high-speed flue gas at the outlet of the flue can smoothly enter the common flue without bending, which can reduce the flow loss in the exhaust pipe and reduce aerodynamic noise.

[0045] It should be noted that, based on the above structure, when installing the range hood 200, since its centrifugal volute 114 adopts a horizontal arrangement structure, the centrifugal volute 114 can be fixedly installed with the wall to improve structural stability, or it can be hidden in the ceiling or inside the cabinet to further block the transmission of noise.

[0046] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model.

Claims

1. A fan device, characterized in that: The fan unit includes an air guide body, an axial flow impeller, a centrifugal impeller, and a drive assembly; The air guide body is provided with a flow guide channel. The axial flow impeller and the centrifugal impeller are rotatably arranged in the flow guide channel and are arranged sequentially along the flow direction of the airflow in the flow guide channel. The drive assembly is connected to the air guide body and is also connected to the axial impeller and the centrifugal impeller via a transmission.

2. The fan device according to claim 1, characterized in that: The air guide body includes an air guide tube, an axial flow casing, and a centrifugal volute. The axial flow housing and the centrifugal volute are connected to both ends of the air guide tube and are in communication with the air guide tube to form the air guide channel; The axial flow housing is provided with an air inlet, and the centrifugal volute is provided with an air outlet. The air inlet direction is perpendicular to the air outlet direction.

3. The fan device according to claim 2, characterized in that: The drive assembly includes a drive unit, a first transmission component, and a second transmission component; The drive unit is connected to the air guide tube, and the drive unit is connected to the axial flow impeller through the first transmission component, and the drive unit is connected to the centrifugal impeller through the second transmission component.

4. The fan device according to claim 3, characterized in that: The drive unit includes a drive motor, and the first transmission component and the second transmission component are both connected to the drive motor; or, the drive unit includes two drive motors, one of which is connected to the first transmission component and the other of which is connected to the second transmission component.

5. The fan device according to claim 3, characterized in that: The fan device also includes rectifier blades disposed within the air guide body, and the rectifier blades are provided with mounting portions for mounting the drive unit.

6. The fan device according to claim 3, characterized in that: The first transmission component includes a first transmission shaft; the second transmission component includes a second transmission shaft and at least one rotating bracket, the rotating bracket being disposed inside the air guide duct, and the second transmission shaft being rotatably connected to the rotating bracket.

7. The fan device according to claim 6, characterized in that: One or both of the first and second drive shafts are connected to the drive unit via a speed change mechanism.

8. The fan device according to claim 2, characterized in that: The air inlet is provided with an outward-flaring arc-shaped flare.

9. The fan device according to claim 2, characterized in that: A filter module is installed inside the air duct.

10. A range hood, characterized in that: The range hood includes a main body, a smoke collection hood, a check valve, and a fan device as described in any one of claims 1-9; The smoke hood and the fan device are both connected to the main body of the smoke machine, and the smoke hood is connected to the air inlet of the guide channel. The check valve is connected to the fan device and is connected to the air outlet of the guide channel.

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