Axial magnetic flux type millimeter-level miniature fan

Abstract

The utility model provides an axial magnetic flux type millimeter-level miniature fan, which comprises a base, a fan body, a fan blade, a fan blade, a fan blade and an axial magnetic flux type millimeter-level miniature fan, the flexible printed circuit board comprises a main board part and an extension section, the main board part is provided with a Hall sensor, and the extension section is provided with an electrical connection terminal and a driver; the coil printed circuit board stator comprises a front surface and a back surface, the front surface comprises a coil unit formed by a plurality of groups of metal windings, and a plurality of electrical contacts are formed on the back surface; a blade group; a magnetic rotor member coupled to the blade group and having a gap between the magnetic rotor member and each of the coil units; and a shell cover. The miniature fan has the advantages that the manufacturing and assembling cost is reduced, and the thin development trend of the miniature fan is facilitated. By means of the shape characteristic that the driver is moved out of the containing space of the base, the deformation degree is high, the height and the size of the fan can be further reduced, the thin development trend of the miniature fan is better facilitated, and the miniature fan has good practical progress and industrial utilization benefits.

Description

Technical Field

[0001] This utility model relates to micro fans, specifically to an axial flux type millimeter-level micro fan. Background Technology

[0002] Whether a miniature fan can achieve an ideal thin profile depends on the shape of its various components. Currently, the two existing structural forms commonly used in the industry each have their own problems.

[0003] The first existing structure involves etching copper wires into a printed circuit board and soldering the conductors on. While this process is simple, it has a significant drawback: it cannot be integrated with the system using flexible printed circuit board (FPCB) connectors.

[0004] Another existing structure involves soldering independently formed enameled wire coils onto a flexible circuit board. However, this structure faces significant challenges in terms of both technology and cost. Specifically, the bonding process between the enameled wire and the flexible circuit board is not only technically difficult but also time-consuming and costly, making it neither an ideal nor a practical method.

[0005] Given the problems with the two existing micro fan structures mentioned above, developing a more ideal and practical innovative structure has become a pressing direction and goal for relevant industries. Based on years of experience in the manufacturing, development, and design of related products, the creators conducted detailed design and careful evaluation to achieve this goal, and ultimately successfully developed a new, practical structure. Utility Model Content

[0006] The purpose of this invention is to provide an axial flux millimeter-level miniature fan.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] An axial flux-driven millimeter-scale miniature fan includes:

[0009] A base includes a receiving space having a central axis seat, and the receiving space also has an open side;

[0010] A flexible printed circuit board includes a main board portion and an extension portion, wherein the main board portion is disposed within a receiving space of a base, and the extension portion extends to the outside of one side of the receiving space. The main board portion is provided with a Hall sensor, and the extension portion is provided with an electrical connection terminal and a driver.

[0011] A coil printed circuit board stator, which is a rigid board type, includes a front side and a back side. The front side includes a coil unit composed of an array of metal windings, while the back side has several electrical contacts that are electrically connected to the main board of the flexible printed circuit board.

[0012] A blade assembly, which includes a rotating shaft for rotatably mounted on a central shaft seat in the accommodating space, is in a rotatable state;

[0013] A magnetic rotor component, coupled to the blade assembly and maintaining a gap between itself and the coil units of the coil printed circuit board stator; and

[0014] A cover for closing the opening side of the enclosure space.

[0015] In a further technical solution, the stator of the coil printed circuit board is also formed with a hole for fitting a central shaft seat assembled in the receiving space, and at least one positioning notch is formed on one side of the hole.

[0016] In a further technical solution, the flexible printed circuit board and the stator of the coil printed circuit board are also provided with positioning marks for relative positioning, which can be used as a basis for visual inspection to determine and confirm the assembly alignment angle when the two are assembled together.

[0017] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.

[0018] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.

[0019] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.

[0020] The working principle and advantages of this utility model are as follows:

[0021] This utility model provides an axial flux-type millimeter-level micro fan, comprising: a base including a receiving space, a central shaft seat within the receiving space, and an opening side of the receiving space; a flexible printed circuit board including a main board portion and an extension portion, the main board portion being placed within the receiving space, the extension portion extending to the outside of one side of the receiving space, the main board portion having a Hall sensor, and the extension portion having an electrical connection terminal and a driver; a coil printed circuit board stator, which is a rigid board type, the coil printed circuit board stator including a front side and a back side, the front side including a coil unit composed of an array of metal windings, and the back side having several electrical contacts electrically connected to the main board portion of the flexible printed circuit board; a blade assembly including a rotating shaft for rotatably disposed on the central shaft seat of the receiving space; a magnetic rotor component, combined with the blade assembly and maintaining a gap between it and each coil unit of the coil printed circuit board stator; and a cover for closing the assembly on the opening side of the receiving space.

[0022] Based on the aforementioned innovative structural form and technical features, this utility model, compared to existing technologies, perfectly combines rigid and flexible board structures, thus significantly reducing winding processes and simplifying components. This results in lower manufacturing and assembly costs, and further reduces the fan height and volume, facilitating the trend towards thinner microfans. Furthermore, by moving the driver outside the base housing space, its deformability is high, and the fan height and volume can be further reduced, further promoting the trend towards thinner microfans. Therefore, it possesses superior practical advancements and industrial benefits.

[0023] Another objective of this invention is that the stator of the coil printed circuit board is further provided with a hole for fitting a central shaft seat assembled in the receiving space, and a positioning notch is formed on one side of the hole. With this design, when the stator of the coil printed circuit board and the flexible printed circuit board are subjected to surface bonding technology, it can be used as a sensing positioning mark, thus having further advantages and practical progress.

[0024] Another objective of this invention is to provide a basis for visual inspection and confirmation of the alignment angle of the flexible printed circuit board and the coil printed circuit board stator by forming relative positioning marks. This design allows the two to be assembled together, thus providing further advantages and practical advancements. Attached Figure Description

[0025] Appendix Figure 1 This is an exploded perspective view of the main components of an embodiment of this utility model;

[0026] Appendix Figure 2 This is a perspective view of an embodiment of the present utility model;

[0027] Appendix Figure 3 This is a top view of a partial component of an embodiment of the present utility model;

[0028] Appendix Figure 4 This is a schematic diagram of the back side of the coil printed circuit board stator according to an embodiment of the present invention;

[0029] Appendix Figure 5 This is a combined sectional view of an embodiment of the present utility model;

[0030] Appendix Figure 6 This is an embodiment of the present invention in which a flexible printed circuit board and a coil printed circuit board stator are formed with relative positioning marks.

[0031] In the above figures: 10. Base; 11. Accommodation space; 12. Central shaft seat; 13. Opening side; 20. Flexible printed circuit board; 21. Main board section; 22. Extension section; 23. Hall sensor; 24. Electrical connection terminal; 25. Driver; 30. Coil printed circuit board stator; 31. Front; 32. Back; 33. Metal winding; 34. Coil unit; 35. Electrical contact; 36. Sleeve hole; 37. Positioning notch; 40. Blade assembly; 41. Shaft; 50. Magnetic rotor component; H. Gap; 60. Housing cover; 71, 72. Positioning marks. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0033] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.

[0034] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.

[0035] Please see Figures 1 to 5 The image shown is a preferred embodiment of the axial flux type millimeter-level micro fan of this utility model. This embodiment is for illustrative purposes only and is not limited to this structure in the patent application.

[0036] The axial flux-type millimeter-scale micro fan comprises the following components: a base 10 including a receiving space 11, the receiving space 11 having a central shaft seat 12, the receiving space 11 having an opening side 13; a flexible printed circuit board 20 (FPC) including a main board 21 and an extension 22, wherein the main board 21 is placed within the receiving space 11 of the base 10, and the extension 22 extends to the outside of one side of the receiving space 11; the main board 21 is provided with a Hall sensor 23, and the extension 22 is provided with an electrical connection terminal 24 and a driver 25; and a coil printed circuit board (FPC). The stator 30 (PCB) is a rigid board type. This coil printed circuit board stator 30 includes a front side 31 and a back side 32. The front side 31 includes coil units 34 composed of an array of metal windings 33, while the back side 32 has several electrical contacts 35 electrically connected to the main board portion 21 of the flexible printed circuit board 20. A blade assembly 40 includes a rotating shaft 41 for rotatably mounting on a central shaft seat 12 within the accommodating space 11 (e.g., ...). Figure 5 (As shown); a magnetic rotor component 50 is attached to the blade assembly 40 and maintains a gap H between itself and each coil unit 34 of the coil printed circuit board stator 30 (as shown). Figure 5 (as shown); a cover 60 for closing the opening side 13 of the accommodating space 11.

[0037] like Figure 1 and Figure 3 As shown, in this example, the coil printed circuit board stator 30 is further formed with a sleeve hole 36 to accommodate the central shaft seat 12 assembled in the receiving space 11, and at least one positioning notch 37 is formed on one side of the sleeve hole 36. The positioning notch 37 shown in this example is mainly used as a sensing positioning mark when the coil printed circuit board stator 30 and the flexible printed circuit board 20 are subjected to surface mount technology (SMT) process.

[0038] like Figure 6 As shown, in this example, the flexible printed circuit board 20 and the coil printed circuit board stator 30 are also provided with positioning marks 71 and 72 for relative positioning, so as to serve as a basis for visual inspection to determine and confirm the assembly alignment angle when the two are assembled together.

[0039] Based on the above-described structural composition and technical features, the advantages of this axial flux millimeter-level micro fan in practical applications include:

[0040] (1) The rigid board (i.e., coil printed circuit board stator 30) and the flexible board (i.e. flexible printed circuit board 20) structure are perfectly combined. This can greatly save the winding process and simplify the components, thereby achieving the advantage of reducing manufacturing and assembly costs. The height and volume of the fan can be further reduced, which is more conducive to the development trend of thinner micro fans.

[0041] (2) The driver 25 (i.e. the driver IC) is moved to the outside of the base 10 housing space 11, which makes it more deformable and the height and volume of the fan can be further reduced, thus making it more conducive to the development trend of miniature fans.

[0042] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. An axial flux-driven millimeter-scale miniature fan, characterized in that: include: A base includes a receiving space having a central axis seat, and the receiving space also has an open side; A flexible printed circuit board includes a main board portion and an extension portion, wherein the main board portion is disposed within a receiving space of a base, and the extension portion extends to the outside of one side of the receiving space. The main board portion is provided with a Hall sensor, and the extension portion is provided with an electrical connection terminal and a driver. A coil printed circuit board stator, which is a rigid board type, includes a front side and a back side. The front side includes a coil unit composed of an array of metal windings, while the back side has several electrical contacts that are electrically connected to the main board of the flexible printed circuit board. A blade assembly, which includes a rotating shaft for rotatably mounted on a central shaft seat in the accommodating space, is in a rotatable state; A magnetic rotor component, coupled to the blade assembly and maintaining a gap between itself and the coil units of the coil printed circuit board stator; and A cover for closing the opening side of the enclosure space.

2. The axial flux millimeter-level micro fan according to claim 1, characterized in that: The stator of the coil printed circuit board is also formed with a hole for fitting a central shaft seat assembled in the receiving space, and at least one positioning notch is formed on one side of the hole.

3. The axial flux millimeter-level micro fan according to claim 1, characterized in that: The flexible printed circuit board and the stator of the coil printed circuit board are also provided with positioning marks for relative positioning, which can be used as a basis for visual inspection to determine the assembly alignment angle when the two are assembled together.

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