Power conversion assembly for a centrifugal fan device and centrifugal fan device

Abstract

This disclosure relates to a power conversion assembly (23) for a centrifugal fan device (100), characterized in that the power conversion assembly (23) comprises: a bracket (20) including a power mounting slot (202a); a power board (231) disposed in the power mounting slot (202a), wherein the power board (231) is configured to convert alternating current to direct current; and a cover (24) wherein the cover (24) is fixable to the bracket (20) to cover the power mounting slot (202a). Furthermore, this disclosure also relates to a centrifugal fan device (100).

Description

Technical Field

[0001] This disclosure relates to a power conversion component for a centrifugal fan device and a centrifugal fan device, particularly to a centrifugal fan device for indoor exhaust. Background Technology

[0002] Centrifugal fan units consist of a housing and a fan unit supported by the housing. Traditional indoor centrifugal fans are mostly driven by AC motors, which result in problems such as large size, high noise, and high energy consumption; some products use DC brushless motors, but require an external DC power adapter and cannot be directly connected to the AC power grid, which is inconvenient for users. Utility Model Content

[0003] In response to the aforementioned problems and needs, this disclosure proposes a power conversion assembly for a centrifugal fan device, the power conversion assembly comprising: a bracket including a power mounting slot; a power board disposed in the power mounting slot, wherein the power board is configured to convert alternating current (AC) to direct current (DC); and a cover, wherein the cover is fixable to the bracket to cover the power mounting slot.

[0004] According to a preferred embodiment, the power supply mounting slot has a first arc-shaped edge and a second arc-shaped edge that extend in at least a partial arc shape.

[0005] According to a preferred embodiment, the first arcuate edge is concentric with the outer edge of the bracket, and the second arcuate edge is concentric with the inner edge of the bracket.

[0006] According to a preferred embodiment, the power mounting slot includes a continuously extending protruding edge that protrudes upward from the top of the power mounting slot.

[0007] According to a preferred embodiment, the cover has a top plate and a cover circumferential wall connected to the top plate, wherein the lower edge of the cover circumferential wall facing the power mounting slot includes a continuously extending groove, wherein the groove is configured to mate with the shape of the convex edge.

[0008] According to a preferred embodiment, the convex edge is provided with an elastic sealing portion.

[0009] According to a preferred embodiment, the groove is provided with an elastic sealing portion.

[0010] According to a preferred embodiment, the outer side of the circumferential wall of the cover includes an outwardly protruding lug with a perforation, and a cover mounting post is provided in the region of the bracket adjacent to the power supply mounting slot, wherein the cover mounting post can be embedded in the perforation of the lug.

[0011] According to a preferred embodiment, the cover mounting post includes a screw hole, wherein the cover can be connected to the bracket by means of a bolt passing through the screw hole and the through hole.

[0012] According to a preferred embodiment, the bottom of the power mounting slot includes at least one protruding pin, and the power board includes a mounting hole through which the protruding pin can pass.

[0013] According to a preferred embodiment, the protruding pin is constructed in a stepped shape, thereby spacing the power board from the bottom of the power mounting slot.

[0014] This disclosure also provides a centrifugal fan device, which includes: a motor unit and the aforementioned power conversion component.

[0015] According to a preferred embodiment, the motor unit is arranged on the side of the bracket opposite to the power conversion assembly.

[0016] According to a preferred embodiment, the centrifugal fan device includes an input line and an output line, wherein the input line is configured to connect an AC power supply to the power supply board, and the output line is configured to connect the power supply board to the motor unit.

[0017] According to a preferred embodiment, the motor unit includes a brushless DC motor.

[0018] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings so that the features and advantages of the present disclosure can be readily understood. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. The drawings are merely illustrative of some embodiments of this disclosure and are not intended to limit all embodiments of this disclosure to them.

[0020] Figure 1 A perspective view of a centrifugal fan device according to one embodiment of the present disclosure is shown schematically.

[0021] Figure 2 schematically shown Figure 1 The disassembly diagram of the centrifugal fan unit shown is as follows;

[0022] Figure 3 A perspective view of a housing module according to one embodiment of the present disclosure is shown schematically;

[0023] Figure 4 A perspective view of a fan module according to one embodiment of the present disclosure is shown schematically.

[0024] Figure 5A schematic top view of a fan blade assembly according to one embodiment of the present disclosure is shown;

[0025] Figure 6 This schematically illustrates a disassembled view of a fan module according to one embodiment of the present disclosure from another angle.

[0026] Figure 7 A schematic cross-sectional view of a fan module according to one embodiment of the present disclosure is shown.

[0027] Figure 8 A perspective view of a bracket according to one embodiment of the present disclosure is shown schematically;

[0028] Figure 9 schematically shown Figure 8 Enlarged view of region A shown

[0029] Figure 10 A perspective view of a housing module according to one embodiment of the present disclosure is shown schematically;

[0030] Figure 11 schematically shown Figure 10 An enlarged view of region B;

[0031] Figure 12 A schematic cross-sectional view of a centrifugal fan assembly according to the present disclosure is shown.

[0032] Figure 13 schematically shown Figure 12 An enlarged view of region C shown;

[0033] Figure 14 A power conversion assembly according to the present disclosure is illustrated schematically;

[0034] Figure 15 A partial view of a power conversion assembly according to this disclosure is schematically shown; and

[0035] Figure 16 A perspective view of the cover according to this disclosure is shown schematically from another angle. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0037] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0038] Figure 1 A centrifugal fan device 100 according to one embodiment of the present disclosure is illustrated schematically. Figure 2 The diagram schematically shows an anatomical representation of the centrifugal fan unit 100.

[0039] The centrifugal fan unit 100 mainly includes a housing module 1 and a fan module 2. According to this disclosure, the fan module 2 is detachably installed in the housing module 1 by means of a locking device.

[0040] like Figure 3 As shown, the housing module 1 mainly includes a circumferential housing wall 10 surrounding the periphery, a housing flange surface 11 extending radially outward from the top of the circumferential housing wall 10, and an air outlet channel 12 extending tangentially outward from the circumferential housing wall 10. The circumferential housing wall 10 defines an air inlet channel extending along the axial direction x, thereby the air inlet channel and the air outlet channel 12 are oriented perpendicularly to each other.

[0041] The housing module 1 also includes a baffle plate 14 integrally constructed with the circumferential wall 10 of the housing. The baffle plate 14 is arc-shaped, thereby dividing the internal space defined by the circumferential wall 10 of the housing into two sub-spaces of different areas. The larger sub-space has a cross-section similar to an ellipse and is constructed to accommodate the fan module 2. The smaller sub-space forms an arc-shaped air duct with the inner wall of the circumferential wall 10. This air duct is connected to the air outlet duct 12, which helps the airflow generated by the rotation of the centrifugal fan device 100, reduces airflow turbulence, and allows the airflow to flow smoothly along the air duct.

[0042] Furthermore, a baffle plate 13 is arranged at the opening of the air outlet duct 12. The baffle plate 13 includes a plurality of grilles arranged side by side and is configured to allow airflow only in the direction outward from the air outlet duct 12. This prevents air backflow.

[0043] like Figure 4 As shown, the fan module 2 includes at least a bracket 20, a fan blade unit 21, a motor unit 22, and a power conversion assembly 23. The fan blade unit 21 and the motor unit 22 are mounted on the bracket 20, and the fan module 2 as a whole is detachably mounted in the housing module 1 by means of the bracket 20.

[0044] The support 20 is constructed as a hollow cage-like structure.

[0045] Combination Figure 6 and Figure 7 The structure of the support 20 is described in detail. The support 20 includes a central section 201 with a generally circular bottom shape, surrounding sections 202 spaced radially relative to the central section 201, a plurality of support beams 203 extending between the central section 201 and the surrounding sections 202, and a circumferential wall 205 extending from the outer edge of the surrounding sections 202 in the axial direction x. Furthermore, an outwardly protruding positioning post 204 is provided on the side of the central section 201 facing the fan blade unit 21. It should be noted that the geometric center of the central section 201 may not coincide with the geometric center of the surrounding sections 202; that is, the central section 201 may be eccentrically arranged relative to the surrounding sections 202, thereby giving the surrounding sections 202 a width that varies circumferentially.

[0046] The wind turbine unit 21 includes a first fixing ring 210, a second fixing ring 211, and a wind turbine assembly 212 with multiple blades extending between the first fixing ring 210 and the second fixing ring 211.

[0047] To achieve good hydrodynamic characteristics, in a preferred embodiment, the blades of the wind turbine assembly 212 are constructed with a curved shape in the radial direction r. Especially in the case of… Figure 5 In the exemplary top view, the blade assembly 212 includes 50 blades. As known to those skilled in the art, the angle between the tangent of the airfoil line at the inlet and the circumferential direction is defined as the inlet mounting angle of the blade, and the angle between the tangent of the airfoil line at the outlet and the circumferential direction is defined as the outlet mounting angle of the blade. In this embodiment, the inlet mounting angle β1 of each blade is 85° to 95°, preferably 92.4°. The outlet mounting angle β2 of each blade is 140° to 170°, preferably 155°. Furthermore, the diameter of the circle defined by the inner edge of the blade, i.e., its inlet, is defined as the inlet diameter D1 of the blade, and the diameter of the circle defined by the outer edge of the blade, i.e., its outlet, is defined as the outlet diameter D2 of the blade. In this embodiment, the ratio of the inlet diameter to the outlet diameter of the blade 23 is 0.75:1 to 0.9:1, preferably 0.868:1.

[0048] The blade unit 21 also includes a plurality of reinforcing ribs 213 arranged rotationally symmetrically in the x-axis direction. For example, four reinforcing ribs 213 are provided in this embodiment. These reinforcing ribs 213 extend in a stepped manner from the end of the blade assembly 212 away from the support 20 toward the support 20 and finally converge at the center of the blade assembly 212.

[0049] The motor unit 22 includes a stator core 220, a rotor shaft 221, and a motor drive circuit board 223.

[0050] The stator core 220 is inserted into the positioning post 204 of the central section 201 of the bracket 20. The stator core 220 can be composed of laminations made of core materials widely known to those skilled in the art, such as silicon steel sheets. The arrangement and shape of the silicon steel laminations are also known to those skilled in the art and will not be described in detail here. One end of the rotor shaft 221 is fixedly mounted relative to the fan blade unit 21, and the other end is rotatably arranged in the positioning post 204 by means of at least one bearing. The positioning post 204 is hollow, thereby forming a bearing chamber for the rotor shaft 221. For example, in this embodiment, one end of the rotor shaft 221 is interference-fitted into the mounting hole of the fan blade unit 21, and the other end is rotatably mounted in the bearing chamber provided by the positioning post 204 by means of a bearing 222. The motor drive circuit board 223 is mounted on the side of the central section 201 facing the fan blade unit 21. In addition, the motor unit 22 also includes magnetic rings, magnetic guide rings, etc., which are not specifically shown. Their structures are known to those skilled in the art and will not be described in detail here.

[0051] When the fan blade unit 21 and the motor unit 22 are mounted on the bracket 20 and installed in the housing unit 1 by means of the bracket 20, both the fan blade unit 21 and the motor unit 22 are located in the air inlet channel defined by the circumferential wall 10 of the housing. The central section 201 of the bracket 20 is offset in the axial direction x relative to the surrounding section 202 into the housing unit 1, that is, the central section 201 is closer to the fan blade unit 21 than the surrounding section 202. For example, Figure 7 As shown, the reference plane of the central section 201 is offset in the axial direction x towards the interior of the housing unit 1 compared to the reference plane of the surrounding section 202, wherein the offset amount h is approximately 10 mm. Furthermore, as previously described, the reinforcing ribs 213 of the fan unit 21 are constructed in a stepped manner. This not only increases the air intake area and prevents moisture accumulation, but also achieves efficient heat dissipation of the motor unit 22 through its arrangement in the air intake channel, solving the problem of motor overheating during operation.

[0052] A locking device is provided to facilitate quick and easy installation of the fan module 2 into the housing module 1. For example... Figures 8 to 13 As shown, the locking device includes a buckle 26 formed on the fan module 2 and a slot 16 formed on the housing module 1.

[0053] In a preferred embodiment, a plurality of snap fasteners 26 and a corresponding number of slots 16 may be provided. For example, an even number of snap fasteners 26 and a corresponding number of slots 16 may be provided that are radially opposed to each other.

[0054] The snap fastener 26 is formed on the bracket 20 of the fan module 2. The snap fastener 26 includes a spring piece 261 protruding outward along the axial direction x relative to the circumferential wall 205 of the bracket 20, and a protrusion 262 formed on the spring piece 261 protruding outward toward the circumferential wall 10 of the housing. A partition groove 263 is provided on both sides of the spring piece 261, thereby separating the spring piece 261 from the circumferential wall 205 of the bracket and improving the elasticity of the spring piece 261 and the protrusion 262. The root of the spring piece 261 is provided with a rounded transition to avoid stress concentration and prevent the snap fastener 26 from breaking due to stress during operation.

[0055] The protrusion 262 includes a top surface 262a pointing towards the circumferential wall 10 of the housing and two opposing guide ramps 262b in the axial direction x, wherein each guide ramp 262b forms an obtuse angle relative to the spring tab 261. Thus, the protrusion 262 has a generally trapezoidal cross-section. This trapezoidal structure ensures that the latch 26 can smoothly engage and disengage relative to the slot 16.

[0056] The slot 16 is formed on the circumferential wall 10 of the housing. In a preferred embodiment, the slot 16 is constructed as a through hole with a rectangular cross-section on the circumferential wall 10 of the housing.

[0057] In a preferred embodiment, the size of the slot 16 can be slightly larger than that of the buckle 16. This ensures that the engagement and disengagement processes are smooth while also achieving a stable shape fit connection between the slot 16 and the buckle 16.

[0058] Once the buckle 26 is embedded in the slot 16, it is not visible from the outside, thus avoiding the adverse visual impact caused by the buckle being exposed, and improving the overall aesthetics and flatness of the product.

[0059] When the fan module 2 needs to be installed in the housing module 1, the bracket 20, along with the fan blade unit 21, motor unit 22, and power conversion assembly 23 mounted on the bracket 20, is inserted through the opening in the circumferential wall 10 of the housing. During this process, the circumferential wall 10 of the housing presses the protrusion 262 of the latch 262 along one of the guide ramps 262b of the protrusion 262, causing the protrusion 262 to shift radially inward. When the top surface 262a of the protrusion 262 slides into the slot 16, the protrusion 262 returns to its radially outward position, thereby achieving the engagement of the latch 26 in the slot 16. Thus, the fan module 2 is installed in the housing module 1. In this state, the circumferential wall 205 of the bracket rests against the circumferential wall 10 of the housing, and the spring tab 261 of the latch 26 protrudes beyond the circumferential wall 10 along the axial direction x, facilitating access and operation of the latch 26 by the operator.

[0060] When it is necessary to remove the fan module 2 from the housing module 1, the operator can apply a radially inward squeezing force to the spring piece 261 of the latch 26, thereby causing the spring piece 261 to elastically deform and the protrusion 262 to disengage from the slot 16. At the same time, the fan module 2 is pulled out of the housing module 1 along the axial direction.

[0061] This modular design allows operators to quickly replace the fan module 2 manually without the need for additional tools, facilitating maintenance and timely replacement of the fan module 2 in case of damage.

[0062] As previously described, the central section 201 of the support 20 is arranged eccentrically relative to the surrounding section 202. Consequently, the surrounding section 202 has a varying width. For example... Figure 4 and Figure 6 As shown, a power conversion assembly 23 is arranged on the side of the surrounding section 202 away from the motor unit 22. This power conversion assembly 23 includes a power mounting slot 202a disposed in a relatively wide area of ​​the surrounding section 202, and a power board 231 disposed in the power mounting slot 202a. The power board 231 is designed to convert AC power supplied by the AC power grid into DC power for use by the motor unit 22. In this case, the centrifugal fan device can employ a motor unit 22 constructed as an external rotor brushless DC motor. Therefore, no additional external power adapter is required, and the centrifugal fan device according to this disclosure can be directly connected to the AC power grid.

[0063] like Figure 14 , Figure 15 As shown, the power mounting slot 202a extends at least partially along the surrounding section 202, and includes two arcuately extending edges, namely a first arcuate edge and a second arcuate edge. In a preferred embodiment, the first arcuate edge is arranged radially outside the second arcuate edge. Correspondingly, the bracket 20 is constructed in a similar annular shape and has an outer edge and an inner edge, wherein the first arcuate edge is concentric with the outer edge of the bracket 20, and the second arcuate edge is concentric with the inner edge of the bracket 20. This allows the power mounting slot 202a to obtain the largest possible accommodating area within a limited space.

[0064] The power board 231 is shaped to fit into the power mounting slot 202a. An input line 232 and an output line 233 are respectively provided at both ends of the power board 231. When the centrifugal fan device 100 is powered on, the input line 232 connects the input terminal of the power board 231 to an external AC power grid, inputting AC power into the power board 231; the power board 231 rectifies and steps down the AC power, for example, 120V / 60Hz, into DC power, for example, 24V; the input line 233 connects the output terminal of the power board 231 to the motor drive circuit board 223 of the motor unit 22, outputting the DC power converted by the power board 231 to the motor drive circuit board 223 to drive the centrifugal fan device 100. The motor drive circuit board 223 is arranged on the side of the central section 201 of the bracket 20 facing the motor unit 22, such that the motor drive circuit board 223 and the power board 231 are located on different sides of the bracket 20. To connect the output line 232 from the power board 231 to the motor drive circuit board 223, a through hole is made in the support beam 203 to allow the output line 232 to pass through.

[0065] The power mounting slot 202a includes at least one protruding pin 206 extending upward from the bottom, and a mounting hole corresponding to the position of the protruding pin 206 is provided on the power board 231. When the power board 231 is arranged in the power mounting slot 202a, the protruding pin 206 passes through the mounting hole, thereby achieving pre-positioning of the power board 231 in the power mounting slot 202a. To a certain extent, the protruding pin 206 acts as a foolproof design to prevent the power board 231 from being installed in the power mounting slot 202a at an incorrect angle. Furthermore, the protruding pin 206 spacees the power board 231 from the bottom of the power mounting slot 202a, thereby allowing the power board 231 to be "suspended" in the power mounting slot 202a. This design reduces contact between the power board 231 and other components, maximizing circuit operation safety.

[0066] The centrifugal fan unit 100 also provides a cover 24 for the power supply board 231. For example... Figure 16 As shown, the cover 24 includes a top plate 240 and a cover circumferential wall 241 connected to the top plate 240, wherein the shape of the cover circumferential wall 241 is adapted to the shape of the power supply mounting groove 202a.

[0067] A perforated lug 243 is provided on the outer side of the circumferential wall 241 of the cover 24. Correspondingly, a cover mounting post 207 with a screw hole is provided in the area adjacent to the power mounting slot 202a in the surrounding section 202 of the bracket 20. When the cover 24 covers the power mounting slot 202a, the cover mounting post 207 passes through the perforation in the lug 243 and the cover 24 is fixed to the power mounting slot 202a by means of bolts 27. Thus, the bolt connection between the cover 24 and the bracket 20 is located outside the contact area between the circumferential wall 241 of the cover and the power mounting slot 202a, thereby not affecting the seal of the cover 24 on the power mounting slot 202a. This protects the power board 231 from external environmental interference, such as preventing dust, moisture, etc. from entering the power mounting slot 202a and shortening the service life of the power board 231.

[0068] To further enhance the protective effect of the cover 24 on the power board 231, a continuously extending protruding edge 208 is provided on the edge of the power mounting groove 202a. Correspondingly, a continuously extending groove 242 is provided on the lower edge of the cover circumferential wall 241 facing the power mounting groove 202a. The protruding edge 208 and the groove 242 are shaped to fit together, so that when the cover 24 covers the power mounting groove 202a, the protruding edge 208 can be fitted into the groove 242. Thus, a tight seal is achieved between the cover 24 and the power mounting groove 202a.

[0069] In a preferred embodiment, an elastic material, such as silicone, can be provided at the protruding edge 208 or in the groove 242 to further improve the sealing effect. Particularly preferably, an elastic material, such as silicone, can be provided in both the protruding edge 208 and the groove 242.

[0070] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms “first,” “second,” and similar terms used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, “an” or “a” and similar terms do not necessarily indicate a quantity limitation. Terms such as “comprising” or “including” mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as “upper,” “lower,” “left,” and “right” are used only to indicate relative positional relationships; these relative positional relationships may change accordingly when the absolute position of the described object changes.

[0071] The exemplary embodiments of the present invention have been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the concept of the present invention, and various combinations can be made to the various technical features and structures proposed by the present invention without exceeding the protection scope of the present invention, which is determined by the appended claims.

Claims

1. A power conversion assembly (23) for a centrifugal fan arrangement (100), characterized by, The power conversion component (23) includes: The bracket (20) includes a power supply mounting slot (202a); A power board (231) arranged in the power mounting slot (202a), wherein the power board (231) is configured to convert alternating current (AC) to direct current (DC); and Cover (24). The cover (24) can be fixed on the bracket (20) to cover the power supply mounting slot (202a).

2. The power conversion assembly (23) of claim 1, characterized in that, The power mounting slot (202a) has a first arc-shaped edge and a second arc-shaped edge that extend at least partially in an arc shape.

3. The power conversion assembly (23) of claim 2, characterized by The first arc-shaped edge is concentric with the outer edge of the bracket (20), and the second arc-shaped edge is concentric with the inner edge of the bracket (20).

4. The power conversion assembly (23) of claim 1, characterized by The power mounting slot (202a) includes a continuously extending protruding edge (208) that protrudes upward from the top of the power mounting slot (202a).

5. The power conversion assembly (23) of claim 4, characterized by The cover (24) has a top plate (240) and a cover circumferential wall (241) connected to the top plate (240), wherein the lower edge of the cover circumferential wall (241) facing the power mounting groove (202a) includes a continuously extending groove (242), wherein the groove (242) is shaped to fit the protrusion (208).

6. The power conversion assembly (23) of claim 5, characterized by The protruding edge (208) is provided with an elastic sealing part.

7. The power conversion assembly (23) of claim 5, characterized by The groove (242) is provided with an elastic sealing part.

8. The power conversion assembly (23) of claim 5, characterized by The outer side of the circumferential wall (241) of the cover includes an outwardly protruding lug (243) with a perforation, and a cover mounting post (207) is provided in the region of the bracket (20) adjacent to the power mounting slot (202a), wherein the cover mounting post (207) can be inserted into the perforation of the lug (243).

9. The power conversion assembly (23) of claim 8, characterized by The cover mounting post (207) includes a screw hole, wherein the cover (24) can be connected to the bracket (20) by means of a bolt (27) passing through the screw hole and the through hole.

10. The power conversion assembly (23) of claim 1, characterized by The bottom of the power mounting slot (202a) includes at least one protrusion (206), and the power board (231) includes a mounting hole through which the protrusion (206) can pass.

11. The power conversion assembly (23) of claim 10, characterized by The protruding pin (206) is constructed in a stepped manner, thereby spacing the bottom of the power board (231) and the power mounting slot (202a) from each other.

12. A centrifugal fan arrangement (100), characterized by The centrifugal fan unit (100) includes: Motor unit (22), and The power conversion component (23) according to any one of claims 1 to 11 above.

13. The centrifugal fan device (100) according to claim 12, characterized in that The motor unit (22) is arranged on the side of the bracket (20) away from the power conversion assembly (23).

14. The centrifugal fan device (100) according to claim 13, characterized in that The centrifugal fan device (100) includes an input line (232) and an output line (233), wherein the input line (232) is configured to connect an AC power supply to the power board (231), and the output line (233) is configured to connect the power board (231) to the motor unit (22).

15. The centrifugal fan arrangement (100) according to claim 12, characterized in that The motor unit (22) includes a brushless DC motor.

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