TWI583870B - Cooling fan with a coil substrate - Google Patents

Description

Axial induction motor fan

The present invention relates to a heat dissipating fan, and more particularly to a heat dissipating fan having a coil substrate and an axial air gap which can reduce the overall axial height.

Referring to FIG. 1 , a conventional cooling fan 9 is disclosed. The conventional cooling fan 9 includes a frame 91 , a coil substrate 92 , a driving circuit 93 , and a fan wheel 94 . The fan frame 92 is provided with an air inlet 911 and an air outlet 912. The fan frame 91 defines a base 913 between the air inlet 911 and the air outlet 912. The coil substrate 92 has an upper surface 921 and a lower surface. 922, the upper surface 921 can be formed into a plurality of coils 923 by means of wiring, the lower surface 922 is coupled to the base 913; the driving circuit 93 is electrically connected to the coil 923 of the coil substrate 92 by a wire 931; the fan wheel 94 The fan frame 91 is rotatably coupled to the inside of the fan frame 91, and the fan wheel 94 is provided with a permanent magnet 941 opposite to the coil substrate 92. Thereby, the driving circuit 93 can drive the fan wheel 94 to rotate by the coil substrate 92 and the permanent magnet 941, thereby generating an air flow to provide a predetermined heat dissipation function.

Moreover, today's electronic products have generally been developed in the direction of miniaturization, etc., because the coil substrate 92 and the permanent magnet 941 of the conventional heat dissipation fan 9 have an axial air gap, and the plurality of coils 923 are wired. It is disposed on the surface of the coil substrate 92. Therefore, by the axial air gap and the design of the coil substrate 92, the axial height of the heat dissipation fan 9 can be further reduced for mounting on a microelectronic device or an electronic device.

However, the above-mentioned conventional cooling fan 9 can reduce the axial height, but the above line The ring substrate 92 is mainly provided with the coil 923 by the upper surface 921, and the lower surface 922 is used for bonding to the base 913, so that the upper surface 921 and the lower surface 922 are not easy to be separately provided with electronic components, and therefore, Further, the wiring 931 is externally connected to the driving circuit 93 having electronic components, which not only causes inconvenience in assembly, but also easily occupies excessive space around the cooling fan 9. More importantly, even if the electronic component is forced to be disposed on the lower surface 922 of the coil substrate 92, the airflow generated by the rotation of the fan wheel 94 is less likely to flow to the lower surface 922 of the coil substrate 92 due to the shielding of the coil substrate 92. Between the pedestal 913 and the pedestal 913, the electronic component is not sufficiently dissipated. During the operation of the cooling fan 9, the electronic component is prone to overheating, resulting in a decrease in the service life of the cooling fan 9.

The following directional terms are used in the present invention, such as "before", "after", "left", "right", "upper (top)", "lower", "inside", "outside", The singularity of the present invention is intended to be illustrative only and not to limit the invention.

The present invention provides a heat dissipating fan which can be used to solve the above problem that the conventional heat dissipating fan does not easily dispose the electronic components on the coil substrate.

The heat dissipating fan of the present invention can also effectively dissipate heat for the electronic component when the electronic component is disposed on the coil substrate.

The heat dissipation fan of the present invention comprises a base, a coil substrate and a fan wheel. The susceptor is provided with a shaft portion; the coil substrate has a first surface and a second surface, and the coil substrate is provided with a through hole penetrating the first surface and the second surface, the first surface or A coil assembly is disposed between the first surface and the second surface, the second surface faces the base; the fan wheel includes a hub and a permanent magnet, the hub is provided with a central shaft and a plurality of blades, the central shaft The permanent magnet is coupled to the hub and has an axial air gap between the coil assembly and the coil assembly; wherein a permanent magnet of the fan wheel and a first surface of the coil substrate form a first a second channel is formed between the second surface of the coil substrate and the base, and the coil substrate is provided with a third channel connected between the first channel and the second channel, the first channel The second channel and the third channel together form a flow guiding space, and the second surface of the coil substrate is provided with at least one electronic component located in the second channel, wherein the inner peripheral wall of the through hole of the coil substrate and the shaft joint portion There is a spacing between the outer peripheral walls for forming the third passage described above.

Wherein the shaft joint has a maximum outer diameter, the through hole has a first minimum inner diameter, the first minimum inner diameter is greater than the maximum outer diameter, and the first minimum inner diameter has a gap with the maximum outer diameter The difference may range from 0.2% to 20%, preferably from 1% to 10%.

The one end surface of the hub facing the coil substrate is provided with a stopper portion, and a concave portion is formed inside the stopper portion, and the shaft portion extends into the recess portion toward one end of the hub.

The recessed portion has a second minimum inner diameter that is greater than the maximum outer diameter and smaller than the first minimum inner diameter.

At least one air hole is disposed between the outer peripheral edge of the coil substrate and the through hole, and the at least one air hole penetrates the first surface and the second surface of the coil substrate, and the air hole is configured to form the third channel.

Wherein, a plurality of fixing members are disposed between the second surface of the coil substrate and the base.

The coil substrate is coupled to the outer peripheral wall of the shaft portion by the through hole.

The outer periphery of the base is connected to a frame, and the frame is provided with an air inlet and an air outlet.

The heat dissipation fan of the present invention can be provided with an electronic element on the second surface of the coil substrate In order to improve the assembly convenience of the electronic component, and through the structural design of the flow guiding space, the airflow generated by the rotation of the fan wheel can flow in the flow guiding space to fully dissipate heat for the electronic component. In order to improve the service life of the cooling fan.

〔this invention〕

1‧‧‧Base

11‧‧‧Axis joint

12‧‧‧ bearing

13‧‧‧ frame

131‧‧‧air inlet

132‧‧‧air outlet

2‧‧‧Coil substrate

21‧‧‧ first surface

22‧‧‧ second surface

23‧‧‧Perforation

24‧‧‧ coil set

25‧‧‧ stomata

26‧‧‧Fixed parts

3‧‧‧fan wheel

31‧‧·wheels

311‧‧‧ center axis

312‧‧‧ blades

313‧‧‧stops

314‧‧‧Depression

32‧‧‧ permanent magnet

D1‧‧‧Maximum outer diameter

D2‧‧‧first minimum inner diameter

D3‧‧‧ second smallest inner diameter

S‧‧‧ Diversion space

S1‧‧‧ first channel

S2‧‧‧ second channel

S3‧‧‧ third channel

I‧‧‧Electronic components

[study]

9‧‧‧ cooling fan

91‧‧‧Fan frame

911‧‧‧ air inlet

912‧‧ vents

913‧‧‧Base

92‧‧‧Coil substrate

921‧‧‧ upper surface

922‧‧‧ lower surface

923‧‧‧ coil

93‧‧‧Drive Circuit

931‧‧‧ wiring

94‧‧‧fan wheel

941‧‧‧ permanent magnet

Figure 1: An exploded perspective view of a conventional cooling fan.

Fig. 2 is an exploded perspective view showing the axial induction motor fan of the first embodiment of the present invention.

Fig. 3 is a sectional view showing the combination of the axial induction motor fan of the first embodiment of the present invention.

Fig. 4 is an exploded perspective view showing the fan of the axial induction motor of the second embodiment of the present invention.

Fig. 5 is a sectional view showing the combination of the axial induction motor fan of the second embodiment of the present invention.

Figure 6 is a sectional view showing the combination of the axial induction motor fan of the third embodiment of the present invention.

The above and other objects, features and advantages of the present invention will become more <RTIgt;

Referring to Figures 2 and 3, the axial induction motor fan of the present invention comprises a base 1, a coil substrate 2 and a fan wheel 3. The susceptor 1 is detachably coupled to the coil substrate 2, and the fan wheel 3 is rotatably coupled to the susceptor 1.

The base 1 is provided with a shaft joint portion 11 which is of various structural design capable of rotatably coupling the above-mentioned fan wheel 3. In this embodiment, the shaft joint portion 11 is a hollow shaft tube, and the shaft tube inner portion may be provided with a shaft tube inner assembly, and the shaft tube inner assembly may include at least one bearing 12 for the fan wheel 3 to be rotatable. In combination, for example, the bearing 12 may be a ball bearing or an oil-impregnated bearing, etc.; or the shaft tube internal assembly may also include components such as a dustproof sheet, an oil-resistant sheet or a wear-resistant sheet, as will be understood by those skilled in the art. The invention is not limited.

The outer periphery of the base 1 can also be connected to a frame body 13. The frame body 13 is provided with an air inlet 131 and an air outlet 132, so that the base 1 can cooperate with the frame 13 to form an axial flow. The fan frame structure such as a fan frame, a centrifugal fan frame or a horizontal convection fan frame is not limited in the present invention. In this embodiment, the base 1 is matched with the frame 13 to form a centrifugal fan frame.

The coil substrate 2 has a first surface 21 and a second surface 22, and the coil substrate 2 is provided with a through hole 23 extending through the first surface 21 and the second surface 22. The first surface 21 is provided with a hole The coil assembly 24 has the second surface 22 facing the base 1. In this embodiment, the coil assembly 24 is of various structural designs capable of driving the rotation of the fan wheel 3, for example, the coil assembly 24 can be disposed on the coil substrate by using, for example, a printed circuit, a coreless winding, or an electroforming process. The first surface 21 of the second surface 21, or the coil assembly 24 may be disposed between the first surface 21 and the second surface 22 of the coil substrate 2. Compared with the conventional stator having a silicon steel sheet, the steel sheet may be omitted in the present case. In order to effectively reduce the axial height of the coil substrate 2.

The second surface 22 of the coil substrate 2 is provided with at least one electronic component I, which can be used to supply power or control the operation of the coil assembly 24. In addition, in the present invention, in addition to the coil assembly 24 disposed on the first surface 21 of the coil substrate 2, and the electronic component 1 disposed on the second surface 22, the first component may be selected according to actual needs. The extra space of the surface 21 is provided with a portion of the electronic component 1.

The fan wheel 3 includes a hub 31 and a permanent magnet 32. The hub 31 is provided with a central shaft 311 and a plurality of blades 312. The central shaft 311 rotatably couples the shaft joint portion 11. The permanent magnet 32 is coupled to the hub 31. The permanent magnet 32 is opposed to the coil assembly 24 to form an axial air gap. Thereby, when a current is input to the coil assembly 24, the coil assembly 24 can be caused to generate an alternating magnetic field by an axial air gap with the permanent magnet 32 for driving the rotation of the fan wheel 3.

The heat dissipation fan of the present invention has a structural design for dissipating heat from the electronic component 1. As shown in FIG. 3, a permanent magnet 32 of the fan wheel 3 and the first surface 21 of the coil substrate 2 can be formed. a first channel S1, a second channel S2 is formed between the second surface 22 of the coil substrate 2 and the pedestal 1, and the electronic component I is located in the second channel S2. The coil substrate 2 is provided with a third channel S3. The third channel S3 is connected between the first channel S1 and the second channel S2. The first channel S1, the second channel S2 and the third channel S3 are combined. A flow guiding space S.

Moreover, the third channel S3 of the coil substrate 2 is configured to be connectable between the first channel S1 and the second channel S2, and the present invention is not limited to the structural space type. In the embodiment shown in FIG. 3, the inner peripheral wall of the through hole 23 of the coil substrate 2 and the outer peripheral wall of the shaft portion 11 have a spacing, which can be used to form the third passage S3; The central shaft 311 has an axial direction. The shaft joint portion 11 has a maximum outer diameter D1 in a direction perpendicular to the axial direction. The through hole 23 has a first minimum inner diameter D2, and the first minimum inner diameter D2 is greater than The maximum outer diameter D1, the first minimum inner diameter D2 and the maximum outer diameter D1 have a gap, and the difference may range from 0.2% to 20% of the maximum outer diameter D1, or the difference is The percentage of the maximum outer diameter D1 is in the range of 1% to 10%, whereby the third channel S3 formed by the spacing can be sufficient without occupying too much area of the coil substrate 2. The channel size is sufficient for the airflow to flow smoothly, so as to combine the convenience of the coil assembly 24 and improve the heat dissipation effect of the electronic component 1. Alternatively, in the embodiment shown in FIGS. 4 and 5, at least one air hole 25 is provided between the outer periphery of the coil substrate 2 and the through hole 23, and the at least one air hole 25 penetrates the first surface 21 of the coil substrate 2. And a second surface 22, the air hole 25 is used to form the third channel S3.

Further, as shown in FIG. 6, a stopper portion 313 is formed on a side surface of the hub 31 facing the coil substrate 2, and a recessed portion 314 is formed inside the stopper portion 313 in the axial direction perpendicular to the central axis 311. In the direction of the recess 314, the recessed portion 314 has a second minimum inner diameter D3 that is greater than the maximum outer diameter D1 and smaller than the first minimum inner diameter D2, whereby the shaft portion 11 faces the One end of the hub 31 can extend into the recessed portion 314. When the fan wheel 3 is introduced into the first passage S1, the stopping action of the stopping portion 313 can ensure that the airflow can be directly introduced. Up to the second passage S3 to lift the gas The conduction effect of the flow.

Further, as shown in FIG. 3, a plurality of fixing members 26 may be disposed between the second surface 22 of the coil substrate 2 and the susceptor 1 for supporting and fixing the coil substrate 2, and the coil substrate 2 and the base The second channel S2 may be formed between the seats 1 for smoothly accommodating the electronic component I; or, as shown in FIG. 5, the coil substrate 2 may be directly coupled to the shaft portion 11 by the through holes 23. The outer peripheral wall can also form the second channel S2 between the coil substrate 2 and the susceptor 1 for accommodating the electronic component I; or, as shown in FIG. 6, directly on the coil The electronic component I between the substrate 2 and the susceptor 1 forms the second channel S2.

Referring to Figures 3, 5 and 6, when the axial induction motor fan of the present invention is used to dissipate the electronic component I, the coil assembly 24 can drive the fan wheel 3 to rotate through the axial air gap; Thereby, the fan wheel 3 can simultaneously flow through the flow guiding space S formed by the first channel S1, the second channel S2 and the third channel S3 in the process of introducing and deriving the airflow for The electronic component I located in the second channel S2 performs heat dissipation.

In summary, the axial induction motor fan of the present invention can directly use the second surface 22 of the coil substrate 2 to dispose the electronic component I, thereby having a larger assembly margin in the assembly configuration of the electronic component I. Improve assembly convenience. Furthermore, by the structural design of the flow guiding space S, the airflow generated by the rotation of the fan wheel 3 is more likely to flow in the flow guiding space S to fully target the second channel S2 located in the guiding space S. The electronic component I dissipates heat, thereby effectively preventing the electronic component I from overheating, thereby improving the service life of the cooling fan.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

1‧‧‧Base

11‧‧‧Axis joint

12‧‧‧ bearing

2‧‧‧Coil substrate

21‧‧‧ first surface

22‧‧‧ second surface

23‧‧‧Perforation

24‧‧‧ coil set

26‧‧‧Fixed parts

3‧‧‧fan wheel

31‧‧·wheels

311‧‧‧ center axis

312‧‧‧ blades

32‧‧‧ permanent magnet

D1‧‧‧Maximum outer diameter

D2‧‧‧first minimum inner diameter

S‧‧‧ Diversion space

S1‧‧‧ first channel

S2‧‧‧ second channel

S3‧‧‧ third channel

I‧‧‧Electronic components

Claims (9)

An axial induction motor fan includes: a base, the base is provided with a shaft joint; a coil substrate having a first surface and a second surface opposite to each other, and the coil substrate is provided with the through hole a perforation of the first surface and the second surface, a first coil or a combination of the first surface and the second surface, the second surface facing the base; a fan wheel, the fan wheel comprising a hub and a permanent magnet, the hub is provided with a central shaft and a plurality of blades, the central shaft is coupled with the shaft joint, the permanent magnet is coupled to the hub and has an axial air gap with the coil assembly; wherein the fan A first channel is formed between the permanent magnet of the wheel and the first surface of the coil substrate, a second channel is formed between the second surface of the coil substrate and the base, and the coil substrate is connected to the first channel And a third channel between the second channel, the first channel, the second channel and the third channel together form a flow guiding space, and the second surface of the coil substrate is provided with at least one electron in the second channel element Wherein an interval between the inner side of the coil substrate of the perforated peripheral wall of the outer peripheral wall of the shaft portion, the spacing is to form the third passage. The axial induction motor fan of claim 1, wherein the shaft joint has a maximum outer diameter, and the through hole has a first minimum inner diameter, the first minimum inner diameter being greater than the maximum outer diameter, There is a gap between the first minimum inner diameter and the maximum outer diameter, and the difference ranges from 0.2% to 20% of the maximum outer diameter. The axial induction motor fan of claim 1, wherein the shaft joint has a maximum outer diameter, and the through hole has a first minimum inner diameter, the first minimum inner diameter being greater than the maximum outer diameter, There is a gap between the first minimum inner diameter and the maximum outer diameter, and the difference ranges from 1% to 10% of the maximum outer diameter. The axial induction motor fan of claim 2, wherein the hub has a stop portion facing a side surface of the coil substrate, and a recess portion is formed inside the stopper portion, and the shaft portion is formed. The recess is projected toward one end of the hub. The axial induction motor fan of claim 4, wherein the recess has a second minimum inner diameter that is greater than the maximum outer diameter and smaller than the first minimum inner diameter. The axial induction motor fan of claim 1, wherein at least one air hole is disposed between the outer circumference of the coil substrate and the through hole, and the at least one air hole penetrates the first surface and the second surface of the coil substrate The surface is configured to form the third passage. The axial induction motor fan according to claim 1 or 2, wherein a plurality of fixing members are provided between the second surface of the coil substrate and the base. The axial induction motor fan according to claim 6, wherein the coil substrate is coupled to an outer peripheral wall of the shaft portion by the through hole. The axial induction motor fan of claim 1, wherein the outer periphery of the base is connected to a frame, and the frame is provided with an air inlet and an air outlet.