Fan assembly

Abstract

The utility model relates to a fan assembly for assisting an electronic device in heat dissipation. The fan assembly has good heat dissipation performance. The fan assembly comprises a shell, a fan and a circuit board. A channel is formed in the shell. The fan is arranged in the channel and is suitable for rotating in the axis direction. The circuit board is electrically connected with the fan. The shell is provided with a first opening communicated with the channel in the axis direction, and the projection of the circuit board in the axis direction does not pass through the first opening.

Description

[0001] This application claims priority to Taiwan Patent Application No. 114201751, filed on February 20, 2025, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The utility model relates to a fan assembly, in particular to a fan assembly assisting electronic device heat dissipation. BACKGROUND

[0003] Heat dissipation is an important consideration for existing notebook computers in reducing size. In order to improve the heat dissipation capacity, in addition to increasing the speed of the heat dissipation fan or the area of the fan blade, the air inlet of the heat dissipation fan can also be expanded.

[0004] The existing heat dissipation fan installs the circuit board for controlling the fan at the rotating shaft of the heat dissipation fan, and is covered by the rotating disc of the fan blade. Although the area of the air inlet can be increased by changing the rotating disc of the fan blade and the size of the circuit board at the same time, thereby increasing the air inlet amount, because the circuit board has a certain area requirement, such a way has certain limitations. SUMMARY

[0005] The utility model provides a fan assembly with good heat dissipation performance.

[0006] To achieve the above advantages, an embodiment of the utility model provides a fan assembly, comprising: a housing, a fan and a circuit board. The housing has a channel inside. The fan is arranged in the channel and is adapted to rotate in the axial direction. The circuit board is electrically connected to the fan. The housing has a first opening communicating with the channel along the axial direction, and the projection of the circuit board in the axial direction does not pass through the first opening.

[0007] In an embodiment, the fan assembly further comprises a connecting line, the circuit board is electrically connected to the fan through the connecting line, and the circuit board does not contact the housing.

[0008] In an embodiment, the housing comprises a first wall, a second wall opposite to the first wall, and a side wall connected between the first wall and the second wall, the circuit board is arranged on the first wall and in the channel.

[0009] In an embodiment, the housing is recessed with a receiving groove on the first wall, the receiving groove communicates with the channel, and the circuit board is arranged in the receiving groove.

[0010] In an embodiment, the housing further comprises a second opening, the second opening is arranged on the first wall, and the first opening is arranged on the second wall.

[0011] In an embodiment, the housing comprises a first wall, a second wall opposite to the first wall, and a side wall connected between the first wall and the second wall, the first wall has an extension on an outer surface of the housing, the side wall is concavely provided with a recess toward the passage, the extension and the recess jointly surround a groove, and the circuit board is arranged in the groove.

[0012] In an embodiment, the housing has a third opening jointly surrounded by the first wall, the second wall, and the side wall, the passage communicates with the third opening, and the groove is adjacent to the third opening.

[0013] In an embodiment, the housing comprises a first wall, a second wall opposite to the first wall, and a side wall connected between the first wall and the second wall, the first wall, the second wall, and the side wall jointly surround an air outlet, the first wall is not parallel to the second wall, and the passage is tapered from the air outlet toward an inner portion of the passage.

[0014] In an embodiment, the passage comprises a pressurizing area, a setting area, and a communicating area, the communicating area is adjacent to the air outlet, the setting area is arranged between the pressurizing area and the communicating area and is adjacent to the first opening, the setting area is adapted to accommodate the fan, and an inner diameter of the pressurizing area is tapered from a side adjacent to the communicating area to a direction away from the communicating area.

[0015] In an embodiment, the fan comprises an impeller, the impeller has a central disc and a plurality of blades arranged around the central disc, and the central disc has a plurality of through holes toward a direction of an axis.

[0016] In an embodiment, the fan comprises an impeller, the impeller has a central disc and a plurality of blades arranged around the central disc, and the central disc has a conical portion protruding toward a direction of an axis.

[0017] With the above description, the fan assembly of the present application can reduce the influence of the circuit board on the airflow passing through the first opening, and thus improve the heat dissipation capacity of the fan assembly, because the position of the circuit board is adjusted so that the projection of the circuit board along the direction of the axis of the fan in the fan assembly does not pass through the first opening.

[0018] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is an exploded schematic view of the fan assembly of the present application in an embodiment;

[0020] Figure 2 is Figure 1 a sectional view of the A-A section in the above-mentioned embodiment.

[0021] Figure 3 is a schematic view of the fan assembly of another embodiment of the present application after removal of the first cover member;

[0022] Figure 4 is a top view of the embodiment of the present application after removal of the first cover member; Figure 3

[0023] Figure 5 is a schematic view of the fan assembly of another embodiment of the present application after removal of the first cover member;

[0024] Figure 6 is a schematic view of the fan assembly of another embodiment of the present application after removal of the first cover member;

[0025] Figure 7 is a schematic view of the fan assembly of another embodiment of the present application after removal of the first cover member. DETAILED DESCRIPTION

[0026] In the following description of embodiments according to the present application, the terms such as "upper", "lower", etc. indicating the orientation or positional relationship are described based on the orientation or positional relationship shown in the drawings used, and the terms are merely used for the convenience of describing the present application and are not intended to limit the present application, i.e., are not intended to indicate or imply that the mentioned elements must have a specific orientation or be constructed in a specific orientation. In addition, the terms "first", "second", etc. mentioned in the specification or claims are merely used to name the elements or to distinguish different embodiments or ranges, and are not intended to limit the upper or lower limit of the number of elements.

[0027] Figure 1 is an exploded schematic view of the fan assembly of an embodiment of the present application, Figure 2 is a schematic view of the cross section at the A-A cross section line in Figure 1 As shown in Figure 1 and Figure 2 , the fan assembly 100 of an embodiment of the present application includes a housing 2, a fan 3, and a circuit board 4. The housing 2 has a passage 20 inside. The fan 3 is disposed in the passage 20 and is adapted to rotate in an axial direction A. The circuit board 4 is electrically connected to the fan 3. As shown in Figure 2 , the housing 2 has a first opening 2A communicating with the passage 20 in the axial direction A, and a projection of the circuit board 4 in the axial direction A does not pass through the first opening 2A.

[0028] The fan assembly 100 is used as a cooling fan in an electronic device (not shown), for example. The electronic device can be a notebook computer, and the fan assembly 100 can be a centrifugal fan, but is not limited thereto. As shown in Figure 1 and Figure 2 ​The shape of the illustrated fan assembly 100 (housing 2) can be designed in accordance with the shape of the electronic device, and can be a sheet-shaped assembly that is thin in the axial direction A, but wide in a second direction D2 perpendicular to the axial direction A and a third direction D3 perpendicular to the axial direction A and the second direction D2. The above-mentioned axial direction A, second direction D2, and third direction D3 refer to directions that extend bidirectionally in space along different orientations.

[0029] As shown in Figure 1 and Figure 2 , in particular, the housing 2 includes, for example, a first cover 21 and an opposite second cover 22. The first cover 21 has a second wall 21A. The first opening 2A is located on the second wall 21A. The second cover 22 has a first wall 22A opposite the second wall 21A when combined, a second opening 2B passing through the first wall 22A opposite the first opening 2A, and an arc-shaped side wall 22B surrounding the second opening 2B. The two opposite walls of the first wall 22A and the second wall 21A are, for example, parallel to each other, but are not limited thereto (see the embodiment description below for details). Figure 7

[0030] As shown in Figure 1 , the first cover 21 and the second cover 22 collectively surround a passage 20, a third opening 2C, and a fourth opening 2D communicating with the passage 20 through the second wall 21A, the first wall 22A, and the side wall 22B. The third opening 2C and the fourth opening 2D are, for example, adjacent to each other and respectively face the second direction D2 and the third direction D3, and are formed on different sides of the housing 2, but are not limited thereto.

[0031] In this embodiment, the passage 20 includes, for example, a plenum area 20A, a setting area 20B, and a communication area 20C. The setting area 20B is a region for accommodating the fan 3, and the first opening 2A is directly opposite the setting area 20B. The plenum area 20A is located at one end of the passage 20, and is an area that is arc-shaped around the setting area 20B surrounded by the side wall 22B. The communication area 20C is adjacent to the air outlet (the third opening 2C and the fourth opening 2D), and is located between the setting area 20B and the third opening 2C and the fourth opening 2D.

[0032] As shown in Figure 1 , in this embodiment, the first opening 2A and the second opening 2B are, for example, eccentrically arranged in the passage 20, and the first opening 2A and the second opening 2B are eccentric to the arc-shaped side wall 22B, and different sides of the fan 3 are different distances from the side wall 22B (see Figure 4 for further reference), but are not limited thereto.

[0033] As shown in Figure 1 and 2 ​As shown, the first opening 2A and the second opening 2B are, for example, air inlets of the fan assembly 100, i.e. the air inlets of the fan assembly 100 are located in the axial direction A of the fan 3. The profiles of the first opening 2A and the second opening 2B are, for example, circular, but are not limited thereto. The size of the first opening 2A can be the same as the size of the second opening 2B, and can correspond to the diameter of the fan 3. The centers of the first opening 2A and the second opening 2B can pass through the axis of the fan 3, but are not limited thereto.

[0034] As shown, Figure 1 and Figure 2 As shown, the third opening 2C and the fourth opening 2D are, for example, air outlets of the fan assembly 100. The profiles of the third opening 2C and the fourth opening 2D are, for example, rectangular, corresponding to the profiles of the first cover 21, the second cover 22 and the side wall 22B, but can be set as required. The sizes of the third opening 2C and the fourth opening 2D are not limited, for example, the same, but are not limited thereto. It should be understood that the directions of the third opening 2C and the fourth opening 2D can be set as required, so in other embodiments of the utility model, the housing 2 can have only one or more than three air outlets.

[0035] As shown, Figure 1 and Figure 2 As shown, in this embodiment, the second cover 22 has, for example, an expansion part 22C near the third opening 2C and the fourth opening 2D. In the direction along the axial direction A towards the first cover 21, the wall surface position of the expansion part 22C is different from the wall surface position of the first wall 22A. In this way, in the axial direction A, the inner diameter of the passage 20 near the fan 3 can be smaller than the inner diameter of the passage 20 near the third opening 2C and the fourth opening 2D, but is not limited thereto.

[0036] As shown, Figure 1 and Figure 2 As shown, in this embodiment, the first cover 21 further has, for example, a protruding part 21B protruding on the first cover 21 along the axial direction A and a plurality of convex parts 21C. The protruding part 21B can be adjacent to the third opening 2C and the fourth opening 2D and present an L type, but is not limited thereto. In the axial direction A, the wall surface position of the protruding part 21B is different from the position of the second wall 21A, which is suitable for expanding the cross-sectional area of the passage 20 at the third opening 2C and the fourth opening 2D.

[0037] The convex part 21C surrounds, for example, one side of the first opening 2A. The shape of the convex part 21C on the surface of the first cover 21 is not particularly limited, the size of the convex part 21C can be smaller than the size of the first opening 2A, and the height of the convex part 21C in the axial direction A can be the same as the height of the protruding part 21B, but is not limited thereto.

[0038] As shown, Figure 1As shown, in the present embodiment, the second cover 22 is provided with a plurality of ribs 221A extending toward the center of the second opening 2B, for example, on the second opening 2B, and a bearing portion 221 adapted to bear the fan 3 is jointly supported at the center of the second opening 2B. In the present embodiment, when installed, although both the first opening 2A and the second opening 2B are air inlets, because the bearing portion 221 affects the air intake amount, in the present embodiment, the first opening 2A is, for example, a main air inlet, and the second opening 2B is, for example, a secondary air inlet. It should be understood that in some embodiments, the fan assembly 100 can have only one of the first opening 2A and the second opening 2B as an air inlet, which can be set as needed.

[0039] As shown, Figure 1 and Figure 2 The fan 3, for example, has an impeller 31 and a motor 32 adapted to drive the impeller 31 to rotate. The rotation axis of the motor 32 is the same as the axis of the fan 3, the extension direction of the rotation axis is the same as the axis direction A, and the motor 32 can be a direct current brushless motor 32, but is not limited thereto. The impeller 31, for example, has a central disc 311 rotating around the rotation axis and a plurality of blades 312 arranged around the central disc 311.

[0040] The central disc 311, for example, is bowl-shaped, is adapted to accommodate the motor 32 and is directly driven by the motor 32 to rotate. In the present embodiment, the disc surface of the central disc 311 can be planar, and the direction of the disc surface is toward the axis direction A, but is not limited thereto.

[0041] In the present embodiment, the central disc 311, for example, can be provided with a plurality of through holes 311A arranged in a ring around the axis, for example, 6, but is not limited thereto. The through holes 311A are arranged in a ring and are adapted to allow a portion of the airflow to pass through the motor 32, so as to improve the heat dissipation capacity of the motor 32, thereby increasing the rotation speed of the motor 32 and improving the rotation speed of the fan 3.

[0042] The blades 312 are connected to the central disc 311 and are arranged in a spiral shape, for example, in the radial direction of the fan 3, and are adapted to rotate to generate airflow when indirectly driven by the motor 32 through the central disc 311. As shown, Figure 2 In the present embodiment, in the axis direction A, the shape of the blades 312, for example, has a neck between the end away from the axis and the end close to the central disc 311, so that the height of the end of the blades 312 away from the axis is greater than the height of the end of the blades 312 close to the axis, but is not limited thereto. The angle of the blades 312 can be determined according to the required air exhaust direction. In the present embodiment, when the fan 3 rotates, the fan 3 exhausts air along the second direction D2 and the third direction D3 (centrifugal direction) perpendicular to the axis direction A toward the periphery of the fan 3, but the detailed design of the fan 3 is not limited thereto.

[0043] The circuit board 4 is, for example, a board including a substrate, electronic components disposed on the substrate, and protrusions such as solder points. The substrate has, for example, a printed circuit, and the substrate can be a flexible substrate or a rigid substrate. The electronic components are, for example, resistors, chips, light emitting diodes, and the like, but are not limited thereto. As shown in Figure 1 and Figure 2 In the present embodiment, the circuit board 4 is connected to an electronic device (not shown, which is a notebook computer in the present embodiment) by a wire 41. The circuit board 4 is, for example, adapted to provide a control signal required to operate the fan 3 to control the operation mode of the fan 3 such as the start and rotation speed of the fan 3, but the function thereof can be set as required.

[0044] As shown in Figure 1 and Figure 2 In the present embodiment, the circuit board 4 is not in direct contact with the housing 2, but is electrically connected to the motor 32 by a connection wire 42. The connection wire 42 is, for example, an electrically conductive wire, and the connection wire 42 is, for example, passed through the second cover member 22, extends along the rib 221A to the bearing portion 221, and is connected to the motor 32, but is not limited thereto. With the configuration, the position of the circuit board 4 can be arranged in the electronic device as required and away from the housing 2 by the flexible connection wire 42, and thus the circuit board 4 does not affect the flow of the air flow.

[0045] It should be understood that, in the present embodiment, the circuit board 4 is separated from the housing 2, and thus the shape of the circuit board 4 is not particularly limited, and in some embodiments, the circuit board 4 can be directly integrated with the main board or other board of the electronic device such as a notebook computer.

[0046] Figure 3 is a schematic view of the fan assembly of another embodiment of the present application after the first cover member is removed. Figure 4 is Figure 3 a top view of the embodiment of Figure 3 and Figure 4 In the embodiment shown in Figure 3 , Figure 4 The fan assembly 100a includes a housing 2a, a fan 3, and a circuit board 4a. Hereinafter, because the first cover member 21 of the housing 2a and the design of the fan 3 can be the same as those of the aforementioned embodiments, only the parts of the housing 2a and the circuit board 4a that are different from those of the aforementioned embodiments will be described. Figure 1

[0047] As shown in Figure 3 ​As shown, in the present embodiment, the housing 2a also comprises a first cover 21 (not shown) and a second cover 22. The first cover 21 can refer to the aforementioned embodiments and thus will not be described again. The second cover 22, for example, is recessed with a receiving groove 23 of the communication passage 20 on the first wall 22A along the axial direction A, and the receiving groove 23 is adapted to receive the circuit board 4a so that the circuit board 4a is connected to the housing 2a and positioned in the passage 20, and the projection of the circuit board 4a does not pass through the first opening 2A.

[0048] Please refer to Figure 1 , Figure 3 and Figure 4 As shown, on the first wall 22A of the second cover 22, the receiving groove 23 is located on the side close to the fourth opening 2D around the second opening 2B. In more detail, the receiving groove 23 is, for example, provided in the region between the fourth opening 2D and the second opening 2B covered by the fan 3 in the communication region 20C, but not limited thereto. In the present embodiment, a part of the receiving groove 23 also extends from the communication region 20C into the plenum region 20A and is located between the side wall 22B and the second opening 2B (see Figure 1 ) to present an arc shape, but not limited thereto. The depth of the receiving groove 23 can correspond to the thickness of the substrate of the circuit board 4a or the overall height of the substrate of the circuit board 4a and electronic components, but not limited thereto.

[0049] It should be understood that because the side wall surface of the receiving groove 23 can help improve the structural strength of the second cover 22, the shape and configuration position of the receiving groove 23 can be set according to requirements and are not limited to the above examples. In the embodiments not shown in the figure, a groove similar to the receiving groove 23 can also be provided on the second wall 21A of the first cover 21.

[0050] According to the above Figure 3 embodiments, from the perspective of avoiding the projection of the circuit board 4a in the axial direction A passing through the first opening 2A, in the embodiments not shown in the figure, the above-mentioned receiving groove 23 can also be replaced by a through hole (not shown) provided on the first wall 22A and / or the second wall 21A, and the circuit board 4a is set as a plate member (as part of the wall of the passage 20) filling the through hole, or the circuit board 4a covers the through hole as a plate member constituting the bottom of the receiving groove 23, but not limited thereto.

[0051] Figure 5 is a schematic view of the fan assembly after removing the first cover of another embodiment of the utility model. In Figure 5 the embodiment shown in the figure, the fan assembly 100b also comprises a housing 2b, a fan 3 and a circuit board 4b. Below, because the design of the fan 3 can be the same as the previous embodiments, the same parts will not be described again and only the parts of the housing 2b and the circuit board 4b different from the aforementioned Figure 1 embodiment and Figure 3 embodiment will be described.

[0052] like Figure 1 and Figure 5 As shown, in this embodiment, the first cover 21 of the housing 2b ( Figure 5 (Not shown) Please refer to the above. Figure 1 The second cover 22 has, for example, an extension 51 and a recess 52. The extension 51 extends from the first wall 22A in a third direction D3 toward a direction away from the fan 3 and is located on the outer surface of the housing 2b without communicating with the channel 20. The recess 52 is recessed from the outer surface of the side wall 22B toward the channel 20. The extension 51 and the recess 52 together surround a groove 5. The groove 5 is suitable for receiving the circuit board 4b. In a specific location, the recess 52 is located, for example, next to the third opening 2C and offset to the same side as the eccentric fan 3, such that the groove 5 is located next to the third opening 2C, but is not limited thereto.

[0053] In this embodiment, the outline of the circuit board 4b is provided on the extension 51, for example, corresponding to the shape of the extension 51, and is not provided on the surface of the sidewall 22B, but is not limited thereto. In other embodiments, the first cover 21 (e.g. Figure 1 The circuit board 4b may also have an extension corresponding to the extension 51 (not shown in the figure), and the circuit board 4b may be disassembled into two electrically connected circuit boards and located on different extensions, but is not limited thereto.

[0054] It should be understandable, although in Figure 5 In this embodiment, the housing 2b does not have a fourth opening 2D, but in similar embodiments not shown in the figure, a corresponding position may be provided. Figure 1 The embodiment is located on the third party D3 and Figure 5 The fourth opening 2D opposite the central groove 5.

[0055] According to the above embodiments, from the viewpoint of preventing the projection of the circuit board 4b in the axial direction A from passing through the first opening 2A, in embodiments not shown, the circuit board 4b can be configured as a plate connected to the same position on the second cover 22 instead of the extension 51, but this is not a limitation. Furthermore, in another embodiment not shown, the extension 51 on the second cover and the corresponding extension on the first cover can be configured in other positions, for example, in... Figure 1 The fourth opening 2D is opposite to the third opening 2C, and the sidewall may not have a recess 52.

[0056] Figure 6 This is a cross-sectional view of the fan assembly in another configuration of this utility model after the first cover has been removed. Figure 6 In the illustrated embodiment, the fan assembly 100c also includes a housing 2, a fan 3, and a circuit board 4. In this embodiment, only the design of the fan 3 differs from the previous embodiment, while the housing 2 and circuit board 4 are as described above.Figure 1 、 Figure 3 and Figure 5 of the embodiments, and thus are not described in detail.

[0057] As shown in Figure 6 , in the present embodiment, the disc surface of the center disc 311' of the fan 3 is, for example, convex toward the axial direction A and has a conical portion 311B tapered toward the first opening 2A (refer to Figure 1 ) by the motor 32. Specifically, the disc surface edge of the center disc 311' is recessed toward the direction of the motor 32 (comparable to Figure 2 ) without changing the arrangement position of the impeller 31 and without changing the position of the center point of the center disc 311'. With this configuration, the gas flowing through the center disc 311' is prevented from being obstructed by the edge of the center disc 311', and the intake amount from the first opening 2A (not shown in the figure) can be increased.

[0058] Figure 7 is a cross-sectional view of a fan assembly according to still another aspect of the present application. In the embodiment shown in Figure 7 , because the housing 2c is changed only in the aspect different from the other embodiments described above, only the changed part of the housing 2c is described below.

[0059] As shown in Figure 1 and Figure 7 , in the embodiment of Figure 7 , the housing 2c is, for example, set in an aspect in which the second wall 21A' of the first cover 21 is not parallel to the first wall 22A' of the second cover 22 at the time of installation, so that the passage 20 (refer to Figure 1 ) is tapered along the third direction D3 from the fourth opening 2D toward the inside (the pressurization region 20A) of the passage 20. Specifically, for example, the first cover 21 is set in a manner inclined to be installed on the second cover 22, so that the two wall surfaces opposite to each other of the first wall 22A and the second wall 21A are not parallel to each other. With this configuration, the inner diameter of the passage 20 (refer to the comparison between the inner diameter Rl and the inner diameter R2 on the left and right sides in Figure 7 ) is tapered not only in the portion of the communication region 20C from the fourth opening 2D toward the fan 3, but also in the inner diameter of the passage 20 in the entire pressurization region 20A from the side adjacent to the communication region 20C toward the direction away from the communication region 20C, so that the gas entering the passage 20 is further pressurized to increase the flow speed of the gas when the gas exits the passage 20.

[0060] It should be understood that in the embodiment of Figure 7 , the inner diameter of the passage 20 (see Figure 1 ) is tapered only along the third direction D3, but in other embodiments, the inner diameter of the passage 20 can also be tapered along the second direction D2 or simultaneously along the second direction D2 and the third direction D3 in a similar manner.

[0061] Through the description of the different embodiments above, it should be understood that, Figure 1 The central disc 311 in the embodiments is provided with a through hole 311A, Figure 6 The central disc 311 in the embodiments has a conical part 311B and Figure 7 In the embodiments, the first wall 22A and the second wall 21A are arranged to be non-parallel, and the like, which can be used in combination with or in combination with the above-mentioned Figure 1 、 Figure 3 Or Figure 5 The circuit board is arranged on the different positions of the shell, and can be selected or combined according to the requirements.

[0062] Through the above description, the fan assembly of the utility model can reduce the influence of the circuit board on the airflow passing through the first opening, thereby improving the heat dissipation capacity of the fan assembly, because the position of the circuit board is adjusted, so that the projection of the circuit board along the axial direction of the fan in the fan assembly does not pass through the first opening.

[0063] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as above, it is not intended to limit the utility model. Any skilled person in the art can make some changes or modifications to the above-mentioned methods and technical contents without departing from the scope of the utility model technical scheme, and the equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above-mentioned embodiments according to the technical essence of the utility model still belong to the scope of the utility model technical scheme.

Claims

1. A fan assembly, characterized in that, include: A shell with an internal channel; A fan is disposed within the channel and is adapted to rotate in one axial direction; A circuit board that is electrically connected to the fan; The housing has a first opening along the axial direction that connects to the channel, and a projection of the circuit board in the axial direction does not pass through the first opening.

2. The fan assembly as claimed in claim 1, characterized in that, The fan assembly further includes a connecting wire through which the circuit board is electrically connected to the fan, and the circuit board does not contact the housing.

3. The fan assembly as claimed in claim 1, characterized in that, The housing includes a first wall, a second wall opposite to the first wall, and a side wall connecting the first wall and the second wall. The circuit board is disposed on the first wall and disposed within the channel.

4. The fan assembly as claimed in claim 3, characterized in that, The housing has a recessed storage groove in the first wall, which is connected to the channel, and the circuit board is disposed in the storage groove.

5. The fan assembly as claimed in claim 4, characterized in that, The housing further includes a second opening disposed on the first wall, and the first opening is disposed on the second wall.

6. The fan assembly as claimed in claim 1, characterized in that, The housing includes a first wall, a second wall opposite to the first wall, and a side wall connecting the first wall and the second wall. The first wall has an extension on the outer surface of the housing. The side wall is recessed toward the channel. The extension and the recess together form a groove, and the circuit board is disposed in the groove.

7. The fan assembly as claimed in claim 6, characterized in that, The housing has a third opening formed by the first wall, the second wall and the side wall, the channel communicates with the third opening, and the groove is adjacent to the third opening.

8. The fan assembly as claimed in claim 1, characterized in that, The housing includes a first wall, a second wall opposite to the first wall, and a side wall connecting the first wall and the second wall. The first wall, the second wall, and the side wall together surround a third opening. The first wall is not parallel to the second wall, so that the channel gradually narrows from the third opening toward the interior of the channel.

9. The fan assembly as claimed in claim 8, characterized in that, The channel includes a pressurization zone, a mounting zone, and a connecting zone. The connecting zone is adjacent to the third opening. The mounting zone is located between the pressurization zone and the connecting zone and is adjacent to the first opening. The mounting zone is adapted to accommodate the fan. An inner diameter of the pressurization zone gradually narrows from the side adjacent to the connecting zone toward the direction away from the connecting zone.

10. The fan assembly as claimed in claim 1, characterized in that, The fan includes an impeller having a central disk and a plurality of blades arranged around the central disk, the central disk having a plurality of through holes facing the axial direction.

11. The fan assembly as claimed in claim 1, characterized in that, The fan includes an impeller having a central disk and a plurality of blades arranged around the central disk, the central disk having a conical portion protruding toward the axis.

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