TWI512203B - Cooling fan - Google Patents

Description

Cooling fan

The invention relates to a cooling fan, in particular to a cooling fan which can ensure the normal operation of the fan wheel.

Today's electronic products are generally designed and developed in the direction of miniaturization. The cooling fans installed in various electronic products to provide a predetermined heat dissipation must also be designed to be lighter, thinner and shorter. Miniaturized electronic devices or electronic instruments. However, when the user uses the miniaturized electronic product, the heat radiating fan installed inside the miniaturized electronic product may be excessively pressed through the exterior of the miniaturized electronic product, thereby causing friction noise or even causing the cooling fan to operate. .

For example, as shown in FIG. 1 , a miniaturized electronic product notebook computer is taken as an example for illustration. The notebook computer 80 has a housing 801 having a member such as a panel or a keyboard. The notebook computer 80 is internally provided with a conventional cooling fan 8 including a fan combined with each other. a frame 81 and an upper cover 82. The fan frame 81 is internally provided with a rotatable one of the fan wheels 83; when the user taps or touches the panel or the keyboard of the casing 801 of the notebook computer 80, it may cause The housing 801 directly presses the upper cover 82 of the cooling fan 8. The upper cover 82 may further press the fan wheel 83, which may cause friction noise, or even cause the fan wheel 83 to fail to operate normally, resulting in poor heat dissipation. The life of the notebook computer 80 is greatly reduced.

For this reason, please refer to FIG. 2, which is a novel patent of the "heating fan" of the Republic of China No. M417596, which discloses another conventional cooling fan 9. Which heat dissipation The fan 9 generally includes a hollow barrel 91, a fixed column 92, a stator 93, and a fan wheel 94. The fixed column 92 has a fixed end 921 and a free end 922. The fixed end 922 is fixed to the hollow barrel 91. The stator 93 is coupled to the hollow barrel 91. The fan wheel 94 is rotatably coupled to the fixing post 92 by a bearing 95. The heat sink fan 9 can be installed inside the notebook computer having the keyboard 96. When the user taps the keyboard 96, the bottom edge of the keyboard 96 can abut the free end 922 of the fixed post 92 to prevent the keyboard 96 from pressing the fan wheel 94, ensuring that the fan wheel 94 can operate normally.

However, the cooling fan 9 must utilize the design of the fixing post 92 to prevent the keyboard 96 from pressing the fan wheel 94; therefore, in the process of mounting the cooling fan 9 inside the notebook computer, it protrudes from The free end 922 of the fixing post 92 outside the cooling fan 9 will easily occupy too much space inside the notebook computer, resulting in poor application efficiency of the internal assembly space of the notebook computer; and, if the axial height of the fixing post 92 is When the size is too large, the free end 922 of the fixing post 92 is more likely to interfere with the related components inside the notebook computer, thereby improving the assembly difficulty of the cooling fan.

The main purpose of the present invention is to provide a heat dissipating fan which can effectively prevent the user from excessively pressing the fan wheel through the exterior of the electronic product to prevent friction noise and ensure the normal operation of the fan wheel. .

A second object of the present invention is to provide a heat dissipating fan that is easy to assemble inside various electronic products and does not interfere with or occupy excessive space with related components inside the electronic product.

The cooling fan of the present invention comprises at least one frame, a certain subgroup, a fan wheel and at least one limiting member. The fan frame includes a substrate portion and a cover portion, and a side wall portion is disposed between the substrate portion and the cover portion, and at least one of the substrate portion, the cover portion and the side wall portion is provided with an air inlet and An air outlet; the stator assembly is disposed inside the fan frame; the fan wheel is rotatably coupled to the stator The fan wheel has a radial rotation range, and the fan wheel has a minimum spacing from the cover portion of the fan frame; the at least one limiting member is disposed on the substrate portion and the cover portion of the fan frame It is located outside the rotation range of the fan wheel.

One end of the limiting member is coupled to the base portion of the frame, and the other end extends toward the cover portion of the frame; or one end of the limiting member is coupled to the cover portion of the frame and the other end faces the fan The frame portion of the frame extends in the direction of the substrate.

The stator assembly includes a shaft seat and a coil set. The shaft seat is disposed on a base portion of the frame. The coil set is disposed at an outer periphery of the shaft seat. The fan wheel includes a rotating body, a central shaft and a permanent magnet. a plurality of blades are disposed on the outer circumference of the rotating body, the central shaft is coupled to a central portion of the rotating body, the central shaft is rotatably coupled to the shaft seat, and the permanent magnet is coupled to the rotating body and has gas between the rotating body and the coil assembly Gap.

The rotating body of the fan wheel has a top surface facing the cover portion of the fan frame, and the minimum spacing is a distance between a top surface of the rotating body and a cover portion of the fan frame.

The blade of the fan wheel has a leaf edge facing the cover portion of the frame, the minimum spacing being the distance between the blade edge of the blade and the cover portion of the frame.

The limiting member is adjacent to the air outlet of the fan frame; or the limiting member is located between the air outlet and a peripheral tangent of the radial rotation range, the peripheral tangent indicating that the radial rotation range is closest to the outlet Everything from the tuyere.

〔this invention〕

1‧‧‧Fan frame

11‧‧‧Parts Department

12‧‧‧ Covering Department

121‧‧‧Air inlet

13‧‧‧ Side wall

131‧‧‧air outlet

2‧‧‧stator group

21‧‧‧ shaft seat

22‧‧‧ coil group

3‧‧‧fan wheel

31‧‧‧Rotating body

311‧‧‧ leaves

312‧‧‧ top surface

313‧‧‧Foliage

32‧‧‧ center axis

33‧‧‧ permanent magnet

4, 4'‧‧‧ Limits

5‧‧‧Electronic products

51‧‧‧Shell

D1‧‧‧ minimum spacing

D2‧‧‧ distance

W‧‧‧radial rotation range

[study]

8‧‧‧ cooling fan

80‧‧‧Note Computer

801‧‧‧shell

81‧‧‧Fan frame

82‧‧‧Upper cover

83‧‧‧fan wheel

9‧‧‧ cooling fan

91‧‧‧ hollow barrel

92‧‧‧Fixed column

921‧‧‧ fixed end

922‧‧‧Free end

93‧‧‧ Stator

94‧‧‧fan wheel

95‧‧‧ bearing

96‧‧‧ keyboard

Figure 1: Schematic diagram of a conventional cooling fan device inside a notebook computer.

Figure 2: A schematic cross-sectional view of a conventional cooling fan unit inside a notebook computer.

Fig. 3 is an exploded perspective view showing the heat dissipation fan of the first embodiment of the present invention.

Fig. 4 is a sectional view showing the combination of the heat radiating fan of the first embodiment of the present invention.

Fig. 5 is an exploded perspective view showing the heat radiating fan of the second embodiment of the present invention.

Figure 6 is a sectional view showing the combination of the heat radiating fan of the second embodiment of the present invention.

Figure 7 is a cross-sectional view showing the inside of the notebook computer of the cooling fan of the present invention.

Fig. 8 is a cross-sectional view showing the number of the limiting members of the cooling fan of the present invention.

The above and other objects, features, and advantages of the present invention will become more apparent from the claims. The cooling fan of the present invention comprises a frame 1, a certain subgroup 2, a fan wheel 3 and at least one limiting member 4. The fan frame 1 is preferably a centrifugal fan frame structure capable of axially introducing and radially extracting airflow; the stator set 2 is coupled to the inside of the fan frame 1; the fan wheel 3 is rotatably coupled to the stator set 2 In order to drive the fan wheel 3 to rotate by the stator group 2.

The frame 1 can be a structural design of various geometric shapes, such as a polygon, a circle or an ellipse. In the preferred embodiment, the frame 1 is a square frame structure.

The fan frame 1 of the preferred embodiment of the present invention includes a substrate portion 11 and a cover portion 12, and a spacing between the substrate portion 11 and the cover portion 12 for the substrate portion 11 and the cover portion 12 The side wall portion 13 is disposed between the substrate portion 11, the cover portion 12 and the side wall portion 13 without limitation. In the embodiment, the side wall portion 13 is integrally molded and bonded. The cover portion 12 is an outer peripheral edge of the substrate portion 11, and the cover portion 12 is detachably coupled to the side wall portion 13. Furthermore, at least one of the substrate portion 11, the cover portion 12 and the side wall portion 13 is provided with an air inlet and an air outlet.

In the preferred embodiment of the present invention, the cover portion 12 of the fan frame 1 is provided with the air inlet 121, and the side wall portion 13 is provided with the air outlet 131; wherein the air inlet 121 and the air outlet 131 The position and the number of the arrangement can be changed in the form of a fan frame. For example, when the fan frame is a horizontal convection fan frame, the air inlet and the air outlet can be simultaneously disposed at opposite positions of the side wall portion 13; When the fan frame is a centrifugal fan frame having a double air inlet function, the air inlet ports are two, and are respectively disposed at opposite positions of the cover portion 12 and the substrate portion 11.

The stator assembly 2 of the preferred embodiment of the present invention is disposed inside the fan frame 1 and located between the substrate portion 11 and the cover portion 12; wherein the stator assembly 2 is provided for various combinations of the fan wheels 3, The structural design for driving the rotation of the fan wheel 3. As shown in FIG. 3, in the present embodiment, the stator assembly 2 includes a shaft seat 21 and a coil assembly 22. The axle seat 21 can be integrally or detachably coupled to the base plate portion 11 of the fan frame 1 for the fan wheel 3 to rotatably couple the coil assembly 22 (which may include components such as a silicon steel sheet, a coil or an insulating sleeve) The driving circuit (not shown) is electrically connected to the driving circuit (not shown) for driving the fan wheel 3 to rotate; wherein the stator group 2 drives the fan wheel 3 to rotate. The detailed structural composition and operation principle can be understood by those skilled in the art and will not be described.

The fan wheel 3 is rotatably coupled to the stator set 2, wherein the fan wheel 3 is designed to generate airflow during various rotations. Further, as shown in FIG. 4, the fan wheel 3 has a radial rotation range W. And the fan wheel 3 and the cover portion 12 of the fan frame 1 have a minimum distance D1.

In this embodiment, the fan wheel 3 includes a rotating body 31, a central shaft 32 and a permanent magnet 33. The rotating body 31 can be in the shape of a hub or a flat plate, and the rotating body 31 is provided with a plurality of blades on the outer circumference. The central shaft 32 is coupled to a central portion of the rotating body 31, and the central shaft 32 rotatably couples the shaft seat 21 of the stator assembly 2; the permanent magnet 33 is coupled to the rotating body 31 and faces the stator assembly 2. The coil group 22 has an air gap between the permanent magnet 33 and the coil group 22 of the stator group 2.

The limiting member 4 is disposed between the substrate portion 11 and the cover portion 12 of the fan frame 1. Please refer to FIG. 4 for matching, and the limiting member 4 is located in the radial rotation range of the fan wheel 3. W outside. In the preferred embodiment, the distance D2 between the limiting member 4 and at least one of the substrate portion 11 and the cover portion 12 (the distance D2 referred to in the full text of the present invention may also be zero) is less than the minimum spacing. D1.

The limiting member 4 of the preferred embodiment of the present invention can be roughly divided into the following embodiments: as shown in FIGS. 3 and 4, the limiting member 4 of the first embodiment is disclosed, and one end of the limiting member 4 is disclosed. The cover portion 12 of the fan frame 1 is coupled to the base portion 11 of the fan frame 1 and extends axially. The limiting member 4 is preferably adjacent to the air outlet 131 so as to be relatively far away from the fan frame 1 . Therefore, the limiting member 4 is prevented from affecting the airflow of the flow channel of the fan frame 1; in addition, the combination of one end of the limiting member 4 and the cover portion 12 of the fan frame 1 may be metal stamping or plastic In the embodiment, the cover portion 12 is a metal cover plate, and the limiting member 4 is formed by stamping and bending the metal substrate; further, in the embodiment, the fan wheel 3 The rotating body 31 has a top surface 312 facing the cover portion 12 of the fan frame 1. The minimum spacing D1 refers to the distance between the top surface 312 of the rotating body 31 and the cover portion 12 of the fan frame 1; Thereby, the distance D2 between the limiting member 4 and the substrate portion 11 is smaller than the minimum spacing D1.

As shown in FIGS. 5 and 6, the limiting member 4' of the second embodiment is disclosed. One end of the limiting member 4' is coupled to the base portion 11 of the frame 1 and the other end is facing the cover of the frame 1. The plate portion 12 extends axially, and the limiting member 4' is located between the air outlet 131 and a peripheral tangential line of the radial rotation range W. The peripheral tangential line means that the radial rotation range W is closest to the air outlet 131. In addition, the manner in which one end of the limiting member 4' and the substrate portion 11 of the fan frame 1 are combined may be metal stamping or plastic molding. In the present embodiment, the substrate portion 11 is disclosed. For the plastic substrate, the limiting member 4' is integrally formed from the plastic substrate; further, in the embodiment, the blade 311 of the fan wheel 3 has a leaf edge 313 facing the cover portion 12 of the fan frame 1, the foregoing The minimum distance D1 is the distance between the leaf edge 313 of the blade 311 and the cover portion 12 of the fan frame 1; thereby, the distance D2 between the limiting member 4' and the cover portion 12 is less than the minimum between From D1.

Further, based on the teachings of the limiting members 4, 4' of the first and second embodiments, the limiting members 4, 4' of the present invention are mainly disposed between the substrate portion 11 and the cover portion 12 of the fan frame 1. And in addition to the radial rotation range W of the fan wheel 3, the limiting member 4, 4' can be combined with the substrate portion 11 and the cover portion 12 of the fan frame 1 to achieve the same purpose and function. The setting position can still be covered by the technical concept of the present invention, and therefore, the binding position of the limiting members 4, 4' of the present invention is not limited. For example, those skilled in the art can also combine the limiting member to the side wall portion 13 of the fan frame 1. It is understood by those skilled in the art, and the description is not repeated herein. For example, in the heat dissipation fan of the first embodiment, the heat dissipation fan of the present invention can be mounted inside the casing 51 of an electronic product 5 (such as a notebook computer) in actual use. The body 51 has a member such as a panel or a keyboard; when the user taps or touches a member such as a panel or a keyboard of the housing 51 of the electronic product 5, the distance between the limiting member 4 and the substrate portion 11 The structural design of D2 is smaller than the minimum spacing D1. Even if the housing 51 directly presses the cover portion 12 of the cooling fan of the present invention, the limiting member 4 can be used to ensure the spacing between the fan wheel 3 and the cover portion 12. The fan wheel 3 can be operated normally, thereby improving the service life of the electronic product 5.

Further, also based on the teachings of the stoppers 4, 4' of the first and second embodiments described above, the number of the stoppers 4, 4' of the present invention may be at least one. For example, as shown in FIGS. 3 to 6, the number of the limiting members 4, 4' is one; or, as shown in FIG. 8, the cover portion 12 of the frame 1 is combined with the limiting member 4 as For example, the number of the limiting members 4 may also be several (the limiting member 4' of the second embodiment is also applicable), and the plurality of limiting members 4 have a spacing therebetween, whereby the limiting member 4 can provide A few points of support for better anti-stress effects.

In summary, the heat dissipating fan of the present invention can be designed to prevent the user from being excessively externalized via the electronic product 5 when the heat dissipating fan is assembled inside the various electronic products 5 by the structural design of the limiting member 4, 4'. Press the fan wheel 3 to ensure the normal operation of the fan wheel effect.

Moreover, the heat dissipating fan of the present invention can be disposed between the substrate portion 11 and the cover portion 12 of the fan frame 1 by using the limiting member 4, 4', and is located outside the radial rotation range W of the fan wheel 3. The design prevents the limiting member 4, 4' from protruding outside the fan frame 1; therefore, the cooling fan of the present invention is mounted inside the electronic product 5 as compared with the conventional cooling fan 9 as shown in FIG. In the process, it does not occupy too much space inside the electronic product 5, and does not interfere with the related components inside the electronic product 5, and therefore has the effect of improving assembly convenience.

1‧‧‧Fan frame

11‧‧‧Parts Department

12‧‧‧ Covering Department

121‧‧‧Air inlet

13‧‧‧ Side wall

131‧‧‧air outlet

2‧‧‧stator group

21‧‧‧ shaft seat

22‧‧‧ coil group

3‧‧‧fan wheel

31‧‧‧Rotating body

311‧‧‧ leaves

312‧‧‧ top surface

32‧‧‧ center axis

33‧‧‧ permanent magnet

4‧‧‧Limited parts

Claims (11)

A heat dissipating fan comprising: a frame comprising a substrate portion and a cover portion, wherein a side wall portion is disposed between the substrate portion and the cover portion, wherein the substrate portion, the cover portion and the side wall portion are At least one portion is provided with an air inlet and an air outlet; a certain subgroup is disposed inside the fan frame; a fan wheel is rotatably coupled to the stator group, the fan wheel has a radial rotation range, and the fan wheel and the fan wheel a minimum spacing between the cover portions of the fan frame; and at least one limiting member disposed between the substrate portion and the cover portion of the fan frame and outside the rotation range of the fan wheel, the limiting member and the limiting member The distance between the substrate portion and at least one of the cover portions is less than the minimum pitch. The heat dissipation fan of claim 1, wherein one end of the limiting member is coupled to the substrate portion of the frame and the other end extends toward the cover portion of the frame. The heat dissipation fan of claim 1, wherein one end of the limiting member is coupled to the cover portion of the frame and the other end extends toward the substrate portion of the frame. The heat dissipation fan of claim 1, wherein a distance between the limiting member and at least one of the substrate portion and the cover portion is zero. The heat dissipation fan of claim 1, wherein the stator assembly includes a shaft seat and a coil assembly, the shaft seat is disposed on a base portion of the frame, and the coil assembly is disposed outside the shaft seat. In the periphery, the fan wheel comprises a rotating body, a central shaft and a permanent magnet, and the rotating body is provided on the outer circumference a plurality of blades, the central shaft being coupled to a central portion of the rotating body, the central shaft being rotatably coupled to the shaft seat, the permanent magnet being coupled to the rotating body and having an air gap with the coil assembly. The heat dissipation fan of claim 5, wherein the rotating body of the fan wheel has a top surface facing the cover portion of the fan frame, the minimum spacing being a top surface of the rotating body and a cover of the fan frame The distance between the plates. The heat dissipation fan of claim 6, wherein the blade of the fan wheel has a leaf edge facing the cover portion of the fan frame, the minimum spacing being a leaf edge of the blade and a cover portion of the fan frame The distance between them. The heat dissipation fan of claim 1, wherein the limiting member is adjacent to the air outlet of the fan frame. The heat dissipating fan of claim 1, wherein the limiting member is located between the air outlet and a peripheral tangent of the radial rotation range, the peripheral tangent indicating that the radial rotation range is the closest. Everything in the air outlet. The heat dissipation fan of claim 1, wherein the number of the limiting members is one. The heat dissipation fan of claim 1, wherein the number of the limiting members is several.