Air inlet ring assembly, centrifugal fan and extractor hood

Abstract

The application relates to the technical field of kitchen electrical equipment, in particular to an air inlet ring assembly, a centrifugal fan and a range hood. The air ring assembly comprises an air ring main body surrounding the outer side of the air inlet of the fan, a plurality of pre-rotation assemblies and a power assembly, the plurality of pre-rotation assemblies are distributed on the air ring main body at intervals in a circle, and a pre-rotation flow channel is formed between the two adjacent pre-rotation assemblies; the connection between the plurality of pre-rotation assemblies and the air ring main body is rotary connection, the power assembly is arranged on the shell of the fan, and the power assembly drives the plurality of pre-rotation assemblies to deflect the same angle at the same time, so that the active and accurate control of the deflection angle of the pre-rotation assembly can be realized according to different working conditions, the inlet airflow can be guided in different degrees, different degrees of pre-rotation airflow can be generated, the reasonable deflection of the inlet airflow can be realized, the optimal pre-rotation effect can be achieved under different working conditions, the performance of the centrifugal fan can be improved, and the impact noise caused by airflow separation in the inlet airflow channel can be weakened.

Description

Technical Field

[0001] This application relates to the field of kitchen appliance technology, and in particular to an air inlet assembly, a centrifugal fan, and a range hood. Background Technology

[0002] The smoke extraction effect of a range hood is one of the important indicators of its quality. Among them, the multi-blade centrifugal fan, as the core component of the range hood, plays a decisive role in the smoke extraction effect. Due to the structure of the range hood and the air intake method of the centrifugal fan, the airflow at the air inlet of the centrifugal fan is uneven, making it difficult to improve the smoke extraction effect. Uneven airflow can also cause severe airflow diversion in the blade channel, reducing the effective airflow area, reducing fan efficiency, and significantly increasing the noise from the duct vortex impact. Therefore, uneven airflow at the centrifugal fan inlet seriously affects the smoke extraction effect of the range hood, easily pollutes the kitchen air environment, and affects the user experience.

[0003] To address the issue of uneven airflow in the fan, multi-blade centrifuges on the market typically incorporate pre-rotation measures at the air inlet to pre-rotate the airflow and adjust its angle as it enters the fan. However, existing pre-rotation measures have poor pre-rotation effects and cannot adjust the pre-rotation state according to the actual operating conditions of the fan. Summary of the Invention

[0004] The purpose of this invention is to provide an air inlet ring assembly, a centrifugal fan, and a range hood, so as to actively and accurately control the pre-rotation state, improve the pre-rotation effect, and make the airflow enter the centrifugal fan evenly and stably.

[0005] This invention provides an air inlet ring assembly for installation at the air inlet of a centrifugal fan. The air inlet ring assembly includes an air ring body, multiple pre-rotating components, and a power component. The air ring body is arranged around the outside of the air inlet of the centrifugal fan, and the multiple pre-rotating components are circumferentially spaced on the air ring body. The multiple pre-rotating components are rotatably connected to the air ring body, and each of the multiple pre-rotating components has a rotation axis parallel to the axial direction of the air inlet. The drive end of the power component is connected to the multiple pre-rotating components to drive the multiple pre-rotating components to rotate around their respective rotation axes.

[0006] Furthermore, the pre-swirl assembly includes a guide member, a transmission gear, and a rotating shaft; the axis of the rotating shaft is collinear with the rotation axis of the pre-swirl assembly, one end of the rotating shaft is rotatably connected to the wind ring body, and the other end of the rotating shaft is connected to the guide member; the transmission gear is connected to the guide member, the transmission gear is coaxially arranged with the rotating shaft, and the power assembly can drive the transmission gear to rotate around its own axis.

[0007] Furthermore, the power assembly includes a gear ring, a drive gear, and a drive motor; the drive gear is connected to the drive end of the drive motor, and the drive motor is used to drive the drive gear to rotate; an internal gear portion is formed on the inner wall surface of the gear ring, and an external gear portion is formed on the outer wall surface of the gear ring; the gear ring is arranged around a plurality of pre-rotation components, and the transmission gears of the plurality of pre-rotation components respectively mesh with the internal gear portion of the gear ring, and the external gear portion of the gear ring meshes with the drive gear.

[0008] Furthermore, the guide member includes a first guide portion and a second guide portion that are spaced apart from each other along the axial direction of the rotating shaft; the transmission gear is disposed between the first guide portion and the second guide portion, and both sides of the transmission gear in the axial direction are respectively connected to the first guide portion and the second guide portion; so that the inner side of the gear ring can be inserted between the first guide portion and the second guide portion and mesh with the transmission gear.

[0009] Furthermore, the transmission gear and the rotating shaft are fixedly connected to the first guide portion; the transmission gear has a threaded hole, and the second guide portion has an installation hole for fasteners to pass through; the second guide portion is detachably connected to the transmission gear through the fasteners.

[0010] Furthermore, a first positioning part is formed on the end face of the transmission gear facing the second guide part, and a second positioning part is provided on the second guide part. The first positioning part and the second positioning part are matching protrusions and grooves, so that the second guide part is connected to the transmission gear at a predetermined installation angle.

[0011] Furthermore, there are multiple first positioning parts, which are distributed circumferentially around the threaded hole; there are also multiple second positioning parts, which are distributed circumferentially, and each of the multiple second positioning parts corresponds to one of the multiple first positioning parts.

[0012] Furthermore, both the first guide section and the second guide section are airfoil structures with streamlined shapes.

[0013] Furthermore, when the first guide portion and the second guide portion are airfoil structures, the side surface of the first guide portion facing the wind ring body is connected to the rotating shaft, and the transmission gear is connected to the other side surface of the first guide portion; the mounting hole is opened on the second guide portion, and the second positioning portion is formed on the side surface of the second guide portion facing the transmission gear.

[0014] Furthermore, the first and second guide portions are blade-shaped.

[0015] Furthermore, when the first guide portion and the second guide portion are blade-shaped, the first guide portion is provided with a first connecting portion perpendicular to the rotating shaft, and the rotating shaft and the transmission gear are respectively provided on both sides of the first connecting portion; the second guide portion is provided with a second connecting portion perpendicular to the rotating shaft, the mounting hole is opened on the second connecting portion, and the second positioning portion is formed on the side surface of the second connecting portion facing the transmission gear.

[0016] The present invention also provides a centrifugal fan, including the air inlet ring assembly described in any one of the preceding claims.

[0017] The present invention also provides a range hood, including the centrifugal fan described above.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] The air inlet ring assembly provided by this invention includes an air ring body, multiple pre-swirl components, and a power component. The air ring body is arranged around the outside of the air inlet of the fan, with the axis of the air inlet as its axis. Multiple pre-swirl components are distributed circumferentially on the air ring body, with the axis of the air inlet as their axis. A pre-swirl channel is formed between any two adjacent pre-swirl components. When the fan starts, the incoming airflow can enter the pre-swirl channel, and after being guided by the pre-swirl components to generate pre-swirl airflow, it flows into the air inlet. The connections between the multiple pre-swirl components and the air ring body are all rotatable connections. Each pre-swirl component has a rotation axis parallel to the axis of the air inlet, allowing each pre-swirl component to deflect around its own rotation axis. The power component is mounted on the fan casing. Multiple pre-swirl components are simultaneously connected to the drive end of the power component, so that the power component drives the multiple pre-swirl components to deflect simultaneously by the same angle, thereby causing different degrees of deflection in the direction of the incoming airflow after passing through the pre-swirl channel, generating different degrees of pre-swirl airflow. In practical use, the deflection angle of the pre-swirl component can be actively and precisely controlled according to different working conditions to guide the intake airflow to different degrees, generate different degrees of pre-swirl airflow, achieve reasonable deflection of the intake airflow, and thus achieve the optimal pre-swirl effect under different working conditions, thereby improving the performance of the centrifugal fan and reducing the impact noise caused by airflow separation in the intake channel.

[0020] The present invention also provides a centrifugal fan including the aforementioned air inlet ring assembly, thus the centrifugal fan also has the beneficial effects of the air inlet ring assembly.

[0021] The present invention also provides a range hood, including the centrifugal fan, and thus the range hood also has the beneficial effects of a centrifugal fan. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a centrifugal fan disposed in the air inlet ring assembly according to an embodiment of the present invention;

[0024] Figure 2 This is a partial structural schematic diagram of the air inlet ring assembly provided in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the airfoil-shaped guide provided in an embodiment of the present invention from a first-view perspective.

[0026] Figure 4 This is a schematic diagram of the airfoil-shaped guide provided in an embodiment of the present invention from a second perspective.

[0027] Figure 5 This is a schematic diagram of the blade-shaped flow guide provided in an embodiment of the present invention from a first-view perspective.

[0028] Figure 6 This is a schematic diagram of the blade-shaped flow guide provided in an embodiment of the present invention from a first-view perspective.

[0029] Figure label:

[0030] 1-Centrifugal fan, 11-Air inlet, 2-Fan ring body, 3-Pre-rotation assembly, 31-Guide component, 311-First guide section, 312-Second guide section, 313-Mounting hole, 314-Fastener, 315-Second positioning section, 316-First connecting section, 317-Second connecting section, 32-Transmission gear, 321-Threaded hole, 322-First positioning section, 33-Rotating shaft, 4-Power assembly, 41-Gear ring, 42-Drive gear, 43-Drive motor. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0033] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] The following reference Figures 1 to 6 The present application describes an air inlet assembly, a centrifugal fan, and a range hood according to some embodiments thereof.

[0037] The first aspect of this application provides an air inlet ring assembly.

[0038] Example 1

[0039] Embodiment 1 of this application provides an air inlet ring assembly, such as Figure 1 As shown, it is used to install at the air inlet 11 of the centrifugal fan 1 (hereinafter referred to as the fan) to pre-rotate the incoming airflow at the air inlet 11.

[0040] like Figure 1 and Figure 2As shown, the air inlet ring assembly provided in Embodiment 1 of this application includes an air ring body 2, multiple pre-swirl components 3, and a power component 4. The air ring body 2 is annular and is mounted on the outer casing of the fan. The air ring body 2 is arranged around the air inlet 11 of the fan with the axis of the air inlet 11 as the axis. Multiple pre-swirl components 3 are distributed circumferentially on the air ring body 2 with the axis of the air inlet 11 as the axis, and the multiple pre-swirl components 3 have the same deflection angle. It should be noted that the deflection angle of the pre-swirl component 3 refers to the angle between the length direction of the body of the pre-swirl component 3, i.e., the guiding direction, and the radial line of the circumference at its location. When the pre-swirl component 3 is arranged along the radial direction of the circumference at its location, the deflection angle of the pre-swirl component 3 is 0°. A pre-swirl flow channel is formed between any two adjacent pre-swirl components 3. When the fan starts, the intake airflow can enter the pre-swirl flow channel, generate pre-swirl airflow through the guidance of the pre-swirl components 3, and then flow into the air inlet 11.

[0041] The connections between the multiple pre-swirl components 3 and the main body 2 of the fan ring are all rotatable connections. Each pre-swirl component 3 has a rotation axis parallel to the axis of the air inlet 11, and the rotation axes of the multiple pre-swirl components 3 are distributed circumferentially at intervals around the axis of the air inlet 11, so that each pre-swirl component 3 can deflect around its own rotation axis, thereby giving the pre-swirl components 3 different deflection angles. The power component 4 is set on the outer casing of the fan, and the multiple pre-swirl components 3 are simultaneously connected to the drive end of the power component 4, so that the power component 4 drives the multiple pre-swirl components 3 to deflect at the same angle simultaneously, thereby causing the flow direction of the airflow after passing through the pre-swirl channel to be deflected to different degrees, generating pre-swirl airflow of different degrees.

[0042] In practical use, the deflection angle of the pre-swirl component 3 can be changed by driving the power component 4 according to different working conditions. For example, under the condition of small intake air volume, the fan speed is high, which will make the airflow at the air inlet 11 extremely uneven, and even a large area of ​​backflow zone will appear. At this time, the deflection angle of the pre-swirl component 3 can be adjusted by the power component 4 to make the pre-swirl component 3 have a larger deflection angle. The pre-swirl component 3 with a larger deflection angle guides the intake airflow to a certain extent, so as to enhance the stability of the airflow and improve the performance of the fan. Under the condition of large intake air volume, the fan speed is low, the intake airflow is smooth, and the airflow at the air inlet 11 is also relatively uniform. At this time, the pre-swirl component 3 can be adjusted by the power component 4 to make the pre-swirl component 3 have a smaller deflection angle or no deflection angle, so as to reduce the additional flow resistance brought by the pre-swirl component 3 to the intake airflow.

[0043] Therefore, by setting a power component 4 that can drive the pre-swirl component 3 to deflect at different angles, active and precise control of the deflection angle of the pre-swirl component 3 can be achieved. This allows for different degrees of guidance of the intake airflow under different working conditions, generating different degrees of pre-swirl airflow, and achieving reasonable deflection of the intake airflow. This results in the optimal pre-swirl effect under different working conditions, thereby improving the performance of the centrifugal fan 1 and reducing the impact noise caused by airflow separation in the intake airflow channel.

[0044] Furthermore, even when the same fan operates at the same speed in different range hood housings, the uniformity of the airflow at its inlet is inconsistent. Different fan models also require different levels of rectification. By setting the power component 4 to actively and precisely adjust the deflection angle of the pre-swirl component 3 to generate a reasonable rectification state, the consistency of the application performance of the same fan platform can also be improved.

[0045] In the embodiments, preferably, as shown in the example, Figure 2 and Figure 3 As shown, the pre-swirl assembly 3 includes a flow guide 31, a transmission gear 32, and a rotating shaft 33. The flow guide 31, as the main body for pre-swirl of the incoming airflow, is rotatably connected to the wind ring body 2 via the rotating shaft 33. Specifically, the axis of the rotating shaft 33 is collinear with the axis of rotation of the pre-swirl assembly 3, and one end of the rotating shaft 33 in the length direction is rotatably connected to the wind ring body 2, while the other end of the rotating shaft 33 in the length direction is connected to the flow guide 31. The rotating shaft 33 can rotate relative to the wind ring body 2 around its own axis, thereby enabling the flow guide 31 to rotate relative to the wind ring body 2.

[0046] The transmission gear 32 is connected to the guide member 31, and the axis of the transmission gear 32 is collinear with the axis of the rotating shaft 33. The power assembly 4 can drive the transmission gear 32 to rotate, thereby driving the guide member 31 to deflect. In this embodiment, preferably, the power assembly 4 includes a gear ring 41, a drive gear 42, and a drive motor 43. The axis of the drive gear 42 is parallel to the axis of the rotating shaft 33, and the drive gear 42 is connected to the drive end of the drive motor 43 mounted on the fan housing. The drive motor 43 can drive the drive gear 42 to rotate around the axis of the drive gear 42. The gear ring 41 is annular, with an internal gear portion formed on its inner wall and an external gear portion formed on its outer wall. The gear ring 41 is arranged around the axis of the air inlet 11 and surrounds the outer side of multiple pre-rotation components 3. The transmission gears 32 of the multiple pre-rotation components 3 mesh with the internal gear portion of the gear ring 41. The external gear portion of the gear ring 41 meshes with the drive gear 42. Thus, when the drive motor 43 drives the drive gear 42 to rotate, it can transmit power through the gear ring 41, causing the transmission gear 32 to rotate, thereby causing the guide member 31 to deflect. Therefore, by controlling the rotation angle of the drive gear 42 by the drive motor 43, the deflection angle of the guide member 31 can be precisely controlled. This allows for active and precise control of the deflection angle of the guide member 31 according to different operating conditions, enabling the intake airflow to achieve the optimal pre-rotation effect under different operating conditions and improving the performance of the centrifugal fan 1.

[0047] In this embodiment, preferably, as follows: Figure 2 and Figure 3 As shown, the guide member 31 includes a first guide portion 311 and a second guide portion 312 arranged at intervals along the axial direction of the rotating shaft 33. A transmission gear 32 is disposed between the first guide portion 311 and the second guide portion 312, with one side of the transmission gear 32 connected to the first guide portion 311 and the other side connected to the second guide portion 312. The gap formed between the first guide portion 311 and the second guide portion 312 is adapted to the thickness of the gear ring 41, allowing the inner side of the gear ring 41 to be inserted between the first guide portion 311 and the second guide portion 312 and mesh with the transmission gear 32. Therefore, the first guide portion 311 and the second guide portion 312 axially limit the gear ring 41, enabling the gear ring 41 to stably mesh with the transmission gears 32 of the multiple pre-rotating components 3.

[0048] In this embodiment, preferably, as follows: Figure 3 and Figure 4 As shown, the transmission gear 32 and the rotating shaft 33 are both fixedly mounted on the first guide section 311, and the second guide section 312 located above the first guide section 311 is detachably connected to the transmission gear 32.

[0049] Preferably, such as Figure 4As shown, the transmission gear 32 is provided with a threaded hole 321, which can be located at the axis of the transmission gear 32. The second guide portion 312 is provided with a mounting hole 313, and a fastener 314 passes through the mounting hole 313. The fastener 314 can be screwed to the transmission gear 32 through the threaded hole 321, thereby detachably mounting the second guide portion 312 onto the transmission gear 32. Therefore, by making the upper second guide portion 312 a detachable connection, it is convenient to assemble and disassemble the gear ring 41 between the first guide portion 311 and the second guide portion 312. At the same time, the gap between the second guide portion 312 and the first guide portion 311 can be adjusted to meet the assembly of the gear ring 41, limit the position of the gear ring 41 without hindering its rotation.

[0050] The first guide portion 311 and the second guide portion 312 have a predetermined assembly angle. To ensure accurate assembly of the first guide portion 311 and the second guide portion 312, in this embodiment, preferably, as follows: Figure 4 As shown, a first positioning part 322 is provided on the end face of the transmission gear 32 facing the second guide part 312. The first positioning part 322 is a protrusion. A second positioning part 315 is provided on the second guide part 312. The second positioning part 315 is a groove that matches the first positioning part 322. When the second guide part 312 is installed on the transmission gear 32 at the correct angle, the first positioning part 322 can be inserted into the second positioning part 315, so as to realize the quick and accurate assembly of the first guide part 311 and the second guide part 312.

[0051] It should be noted that the first positioning part 322 can also be a groove, and the second positioning part 315 can be a protrusion that matches the first positioning part 322.

[0052] Preferably, there are multiple first positioning parts 322, which are distributed circumferentially around the threaded hole 321; there are also multiple second positioning parts 315, which are also distributed circumferentially, and each of the multiple second positioning parts 315 corresponds to one of the multiple first positioning parts 322.

[0053] In the first embodiment of this application, preferably, as Figure 3 and Figure 4 As shown, the air guide 31 is an airfoil structure with a streamlined shape, so that the first air guide 311 and the second air guide 312 are airfoil structures with the same shape. By setting the air guide 31 as an airfoil structure with a streamlined shape, the low drag characteristic of the airfoil structure can be fully utilized, which can effectively reduce the impact noise of the inlet airflow on the air guide 31, and also has a smoother air guiding effect.

[0054] When the guide member 31 has an airfoil structure, one end of the rotating shaft 33 is fixedly disposed on the lower surface of the first guide part 311 facing the wind ring body 2, and the transmission gear 32 is disposed on the upper surface of the first guide part 311, and the transmission gear 32 is coaxially disposed with the rotating shaft 33. A mounting hole 313 for fastener 314 is opened on the second guide part 312 at a position directly opposite to the threaded hole 321 of the transmission gear 32, so as to connect the second guide part 312 and the transmission gear 32, thereby realizing the assembly of the first guide part 311 and the second guide part 312, and forming a gap between the first guide part 311 and the second guide part 312 for mounting the gear ring 41.

[0055] Example 2

[0056] Embodiment 2 of this application provides another air inlet ring assembly. The air inlet ring assembly of Embodiment 2 is similar to the air inlet ring assembly of Embodiment 1, except that the shape and structure of the guide 31 are different. In the following text, the differences between Embodiment 2 and Embodiment 1 will be mainly described.

[0057] Unlike Figure 3 The airfoil structure guide 31 shown in Embodiment 2, as... Figure 5 and Figure 6 As shown, the guide member 31 is blade-shaped, and the first guide part 311 and the second guide part 312 are also adapted blade-shaped, so that the two are assembled at intervals along the axial direction of the rotating shaft 33 to form a complete guide blade.

[0058] For the blade-shaped first guide section 311, a first connecting section 316 is provided on the first guide section 311 to install the rotating shaft 33 and the transmission gear 32. The first connecting section 316 is perpendicular to the rotating shaft 33, and one end of the rotating shaft 33 is perpendicularly connected to the lower surface of the first connecting section 316. The transmission gear 32 is fixedly disposed on the upper surface of the first connecting section 316. Similarly, for the blade-shaped second guide section 312, a second connecting section 317 perpendicular to the rotating shaft 33 is provided on the second guide section 312. The mounting hole 313 for fastener 314 is opened on the second connecting section 317, thereby completing the detachable assembly between the blade-shaped first guide section 311 and the second guide section 312. There is still a gap between the first guide section 311 and the second guide section 312 for installing the gear ring 41.

[0059] The second aspect of this application provides a centrifugal fan 1, including a fan ring assembly of any of the above embodiments. The fan ring assembly is mounted on the housing of the centrifugal fan 1 and is arranged around the air inlet 11 of the centrifugal fan 1.

[0060] In the second aspect, the centrifugal fan 1 includes a fan ring assembly, and therefore the centrifugal fan 1 has all the beneficial effects of the fan ring assembly, which will not be elaborated here.

[0061] A third aspect of this application provides a range hood, including the centrifugal fan 1 described in the above embodiments.

[0062] In the third aspect, the range hood includes a centrifugal fan 1, and therefore the range hood has all the beneficial effects of the centrifugal fan 1, which will not be elaborated here.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air inlet ring assembly for installation at the air inlet (11) of a centrifugal fan (1); characterized in that, The air inlet ring assembly includes an air ring body (2), multiple pre-rotation components (3) and a power component (4). The wind ring body (2) is arranged around the outside of the air inlet (11) of the centrifugal fan (1), and a plurality of pre-rotation components (3) are distributed in a circular interval on the wind ring body (2), and the plurality of pre-rotation components (3) have the same deflection angle. Multiple pre-rotation components (3) are rotatably connected to the wind ring body (2), and each of the multiple pre-rotation components (3) has a rotation axis parallel to the axial direction of the air inlet (11); The drive end of the power component (4) is connected to the plurality of pre-spinning components (3) to drive the plurality of pre-spinning components (3) to rotate around their own rotation axes respectively; The pre-spin assembly (3) includes a guide (31), a transmission gear (32), and a rotating shaft (33). The axis of the rotating shaft (33) is collinear with the axis of rotation of the pre-rotating component (3). One end of the rotating shaft (33) is rotatably connected to the wind ring body (2), and the other end of the rotating shaft (33) is connected to the guide (31). The transmission gear (32) is connected to the guide (31), the transmission gear (32) is coaxially arranged with the rotating shaft (33), and the power component (4) can drive the transmission gear (32) to rotate around its own axis; The power assembly (4) includes a gear ring (41), a drive gear (42), and a drive motor (43). The drive gear (42) is connected to the drive end of the drive motor (43), and the drive motor (43) is used to drive the drive gear (42) to rotate. The inner wall surface of the gear ring (41) is formed with an internal gear portion, and the outer wall surface of the gear ring (41) is formed with an external gear portion; the gear ring (41) is arranged around a plurality of pre-rotation components (3), the transmission gears (32) of the plurality of pre-rotation components (3) respectively mesh with the internal gear portion of the gear ring (41), and the external gear portion of the gear ring (41) meshes with the driving gear (42); The flow guide (31) includes a first flow guide (311) and a second flow guide (312) that are spaced apart from each other along the axial direction of the rotating shaft (33). The transmission gear (32) is disposed between the first guide section (311) and the second guide section (312), and the two sides of the transmission gear (32) in the axial direction are respectively connected to the first guide section (311) and the second guide section (312); The inner side of the gear ring (41) can be inserted between the first guide portion (311) and the second guide portion (312) and mesh with the transmission gear (32).

2. The air inlet ring assembly according to claim 1, characterized in that, The transmission gear (32) and the rotating shaft (33) are fixedly connected to the first guide section (311); The transmission gear (32) has a threaded hole (321), and the second guide part (312) has an installation hole (313) for fasteners (314) to pass through. The second guide part (312) is detachably connected to the transmission gear (32) through the fasteners (314).

3. The air inlet ring assembly according to claim 2, characterized in that, The transmission gear (32) has a first positioning part (322) formed on the end face facing the second guide part (312), and the second guide part (312) is provided with a second positioning part (315). The first positioning part (322) and the second positioning part (315) are matching protrusions and grooves, so that the second guide part (312) is connected to the transmission gear (32) at a predetermined installation angle.

4. The air inlet ring assembly according to claim 3, characterized in that, The number of the first positioning parts (322) is multiple, and the multiple first positioning parts (322) are distributed circumferentially around the threaded hole (321); The number of the second positioning parts (315) is also multiple, and the multiple second positioning parts (315) are distributed in a circular interval, and the multiple second positioning parts (315) correspond one-to-one with the multiple first positioning parts (322).

5. The air inlet ring assembly according to claim 3, characterized in that, Both the first guide section (311) and the second guide section (312) are airfoil structures with streamlined shapes.

6. The air inlet ring assembly according to claim 5, characterized in that, When the first guide section (311) and the second guide section (312) are airfoil structures, the side surface of the first guide section (311) facing the wind ring body (2) is connected to the rotating shaft (33), and the transmission gear (32) is connected to the other side surface of the first guide section (311). The mounting hole (313) is formed on the second guide portion (312), and the second positioning portion (315) is formed on the side surface of the second guide portion (312) facing the transmission gear (32).

7. The air inlet ring assembly according to claim 3, characterized in that, The first guide section (311) and the second guide section (312) are blade-shaped.

8. The air inlet ring assembly according to claim 7, characterized in that, When the first guide section (311) and the second guide section (312) are blade-shaped, the first guide section (311) is provided with a first connecting section (316) perpendicular to the rotating shaft (33), and the rotating shaft (33) and the transmission gear (32) are respectively provided on both sides of the first connecting section (316); The second guide portion (312) is provided with a second connecting portion (317) perpendicular to the rotating shaft (33), the mounting hole (313) is opened on the second connecting portion (317), and the second positioning portion (315) is formed on the side surface of the second connecting portion (317) facing the transmission gear (32).

9. A centrifugal fan (1), characterized in that, Includes the air inlet ring assembly as described in any one of claims 1-8.

10. A range hood, characterized in that, Includes the centrifugal fan (1) as described in claim 9.

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