TWI537479B - Dissipating fan - Google Patents

Description

Cooling fan

The present invention relates to a heat dissipating fan, and more particularly to a heat dissipating fan which can be stably rotated by magnetic attraction.

Referring to FIG. 1 , the conventional cooling fan 9 generally includes a metal base 91 , a stator 92 , and a fan wheel 93 . The metal base 91 has a shaft tube 911 at the center; the stator 92 is coupled to the outer peripheral wall of the shaft tube 911; the fan wheel 93 includes a hub 931 and a permanent magnet 932. The hub 931 is rotatably coupled by a rotating shaft 933. In the shaft tube 911, the permanent magnet 932 is disposed on the inner peripheral wall of the hub 931, and an air gap is formed between the permanent magnet 932 and the stator 92; thereby, when the cooling fan 9 is actuated, current can be input to the shaft The stator 92 allows the stator 92 to drive the fan wheel 93 to rotate by the air gap. Similar to the detailed structural composition and operation principle of the conventional cooling fan 9, the invention patent of the "Fan frame seat and the cooling fan having the fan frame" of the Republic of China No. I447304 is disclosed.

In the axial direction of the rotating shaft 933 of the fan wheel 93, the hub 931 and the metal base 91 have a radial rotation range D1. Since the permanent magnet 932 is disposed on the inner peripheral wall of the hub 931, the permanent magnet The 932 is located within the radial rotation range D1. The permanent magnet 932 and the metal base 91 have a magnetic attraction range D2. The permanent magnet 932 can magnetically interact with the metal base 91 through the magnetic attraction range D2 to utilize the magnetic attraction of the two. The fan wheel 93 is caused to rotate smoothly.

However, as shown in FIG. 2, since the metal base 91 has a magnetic conductive effect, the magnetic lines of force M generated by the permanent magnet 932 can pass through the metal base 91. The magnetic flux M generated by the permanent magnet 932 is concentrated on both sides of the suction range D2, so that the axial magnetic attraction between the permanent magnet 932 and the metal base 91 is excessive, and the excessive axial magnetic attraction force is instead It is easy to increase the resistance when the fan wheel 93 rotates, thereby affecting the operation quality of the cooling fan.

The "transparent portion" as defined in the following text refers to a portion of the metal base that is not magnetically attracted to the permanent magnet. The transparent portion may be designed as a through hole or the like, or may be completely made of plastic material or The partially coated through hole is not limited in the present invention.

The invention provides a heat dissipating fan, which can effectively avoid the increase of the resistance of the rotation of the fan wheel due to the excessive magnetic attraction force during the smooth rotation of the fan wheel by the magnetic attraction.

The cooling fan of the invention comprises a frame, a stator and a fan. The fan frame has a metal base, and the metal base is provided with a shaft joint; the stator is coupled to the fan frame; the fan wheel includes a hub, a plurality of blades and a permanent magnet, and the hub is rotatably coupled to the fan frame An axial joint of the fan frame, the plurality of blades being coupled to an outer peripheral wall of the hub, the permanent magnet being disposed on an inner peripheral wall of the hub, and an air gap between the permanent magnet and the stator; wherein the hub and the metal base Between the seats, there is a radial rotation range; the permanent magnet and the metal base have a magnetic absorption range, and the metal base is provided with a transparent portion in the radial rotation range, and the transparent portion is located at the magnetic portion Outside the suction range, the through-hole portion is a plurality of through holes, and the inner peripheral walls of the plurality of through holes respectively have an outer edge, wherein the outer edge is a portion of the inner peripheral wall of the through hole farthest from the shaft portion; the permanent The magnet has an inner side facing the shaft joint; in the axial direction of the fan wheel, an inner side surface of the permanent magnet is aligned with a side edge of the outer portion.

Wherein the metal base has an upper surface facing the hub, the upper surface having an area corresponding to the radial rotation range, and the distribution area of the transparent portion occupies 20% of the area Ninety percent.

The cooling fan of the invention comprises a frame, a stator and a fan. The fan frame has a metal base, and the metal base is provided with a shaft joint; the stator is coupled to the fan frame; the fan wheel includes a hub, a plurality of blades and a permanent magnet, and the hub is rotatably coupled to the fan frame An axial joint of the fan frame, the plurality of blades being coupled to an outer peripheral wall of the hub, the permanent magnet being disposed on an inner peripheral wall of the hub, and an air gap between the permanent magnet and the stator; wherein the hub and the metal base Between the seats, there is a radial rotation range; the permanent magnet and the metal base have a magnetic absorption range, and the metal base is provided with a transparent portion in the radial rotation range, and the transparent portion is located at the magnetic portion Outside the suction range, the through-hole portion is a plurality of through holes, and the inner peripheral walls of the plurality of through holes respectively have an outer edge, wherein the outer edge is a portion of the inner peripheral wall of the through hole farthest from the shaft portion; the permanent The magnet has an inner side facing the shaft joint; in the axial direction of the fan wheel, an inner side surface of the permanent magnet is aligned with a side edge of the outer portion; the metal base is further provided with a plurality of auxiliary air inlets; The suction range is located between the air permeable portion and the auxiliary air inlet, and the inner peripheral walls of the plurality of auxiliary air inlets respectively have an inner edge, and the inner edge is a portion of the inner peripheral wall of the auxiliary air inlet that is closest to the shaft joint and The inner edge is located in the radial rotation range; the permanent magnet has an outer side facing away from the shaft joint; and the outer side surface of the permanent magnet is aligned with the inner edge of the auxiliary air inlet in the axial direction of the fan wheel.

Wherein the metal base has an upper surface facing the hub, the upper surface having an area corresponding to the radial rotation range, and the distribution area of the transparent portion occupies 20% of the area Ninety percent.

By designing the transparent portion, the magnetic lines of force generated by the permanent magnet can be dispersed to reduce the axial magnetic attraction between the permanent magnet and the metal base, thereby reducing the resistance when the fan wheel rotates. Improve the smoothness of running.

〔this invention〕

1‧‧‧Fan frame

11‧‧‧Metal base

111‧‧‧Upper surface

112‧‧‧Auxiliary air inlet

1121‧‧‧ inside edge

12‧‧‧ Side wall

121‧‧‧Air inlet

122‧‧‧air outlet

13‧‧‧Axis joint

14‧‧‧ Cover

141‧‧‧Perforation

15‧‧‧The Department

151‧‧‧ outer edge

2‧‧‧stator

3‧‧‧fan wheel

31‧‧·wheels

32‧‧‧ blades

33‧‧‧ permanent magnet

331‧‧‧ inside

332‧‧‧Outside

D1‧‧‧radial rotation range

D2‧‧‧Magnetic range

M1‧‧‧ magnetic lines

M2‧‧‧ magnetic line

[study]

9‧‧‧ cooling fan

91‧‧‧Metal base

911‧‧‧ shaft tube

92‧‧‧ Stator

93‧‧‧fan wheel

931‧‧·wheels

932‧‧‧ permanent magnet

933‧‧‧ shaft

D1‧‧‧radial rotation range

D2‧‧‧Magnetic range

M‧‧‧ magnetic lines

Fig. 1 is a sectional view showing a combination of a conventional cooling fan.

Fig. 2 is a partial cross-sectional view showing a conventional cooling fan.

Fig. 3 is an exploded perspective view showing the cooling fan of the present invention.

Fig. 4 is a sectional view showing the assembly of the heat radiating fan of the present invention.

Fig. 5 is a partial cross-sectional view showing a cooling fan of the present invention.

Figure 6 is a top plan view of the cooling fan of the present invention.

Fig. 7 is a top plan view showing the auxiliary air inlet of the cooling fan of the present invention.

Fig. 8 is a partial cross-sectional view showing the auxiliary air inlet of the cooling fan of the present invention.

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

Referring to FIGS. 3 and 4, the heat dissipation fan of the present invention may include a frame 1, a stator 2, and a fan wheel 3. The inside of the fan frame 1 is configured to receive the stator 2 and the fan wheel 3, and the stator 2 is used to drive the rotation of the fan wheel 3.

The fan frame 1 has a metal base 11 made of a magnetically permeable material. The metal base 11 is provided with a side wall portion 12 and a shaft joint portion 13. The side wall portion 12 is provided with an air inlet 121 and an air outlet 122. The fan frame 1 can be a hollow frame structure of various shapes that can be coupled to the stator 2 and the fan wheel 3, and the shaft portion 13 can be a metal shaft tube or a plastic shaft tube. Limit it. In this embodiment, the fan frame 1 can further include a cover 14 . The cover 14 is provided with a through hole 141 , and the cover 14 can be coupled to the air inlet 121 of the side wall portion 12 . The air inlet 121 communicates with the inside of the metal base 11 to prevent the member assembled inside the frame 1 from coming off by the cover 14.

The stator 2 is coupled to the fan frame 1. The stator 2 can be selectively coupled to the shaft portion 13 of the fan frame 1 or the surface of the metal base 11, which is not limited in the present invention. In this embodiment, the stator 2 is sleeved on the outer peripheral wall of the shaft joint portion 13 of the fan frame 1. The stator 2 is designed to drive various rotations of the fan wheel 3.

The fan wheel 3 includes a hub 31, a plurality of blades 32, and a permanent magnet 33. The hub 31 is rotatably coupled to the shaft portion 13 of the fan frame 1, and the plurality of blades 32 are coupled to the outer peripheral wall of the hub 31. The permanent magnet 33 is disposed on the inner peripheral wall of the hub 31, and an air gap is formed between the permanent magnet 33 and the stator 2.

Further, in the axial direction of the fan wheel 3, the hub 31 and the metal base 11 have a radial rotation range D1, and the permanent magnet 33 is located in the radial rotation range D1. The permanent magnet 33 and the metal base 11 have a magnetic attraction range D2. Thereby, the metal base 11 is provided with a transparent portion 15 in the radial rotation range D1, and the transparent portion 15 is located outside the magnetic attraction range D2.

When the heat dissipation fan of the present invention is actuated, an electric current is input to the stator 2, so that the stator 2 can generate an alternating magnetic field through an air gap between the permanent magnets 33 for driving the rotation of the fan wheel 3; The magnetic attraction range D2 between the permanent magnet 33 and the metal base 11 is magnetically attracted to the metal base 11 to promote the smooth rotation of the fan wheel 3.

Referring to FIG. 5, when the magnetic lines M1 and M2 generated by the permanent magnet 33 pass through the metal base 11 on opposite sides of the magnetic attraction range D2 by the magnetic conduction of the metal base 11, Since the metal base 11 is provided with the transparent portion 15 on the side of the magnetic attraction range D2, the permanent magnet 33 passes through the magnetic field line M1 on the side of the transparent portion 15 and passes through the permanent magnet 33. The magnetic force line M2 provided on one side of the transparent portion 15 can be relatively dispersed, whereby the present invention can utilize the transparent portion 15 to prevent axial magnetic attraction between the permanent magnet 33 and the metal base 11 If the rotation is too large, the resistance of the fan wheel 3 is reduced to improve the running quality of the cooling fan. Further, by the design of the transparent portion 15, the axis between the permanent magnet 33 and the metal base 11 can be reduced. The magnetic attraction, but still does not affect the magnetic attraction between the permanent magnet 33 and the metal base 11, so that the fan wheel 3 can be smoothly rotated.

Moreover, as shown in FIGS. 4 and 5, the through-hole portion 15 may be a plurality of transparent portions. The inner peripheral wall of the plurality of through holes respectively has an outer edge 151 which is a portion of the inner peripheral wall of the through hole which is farthest from the axial portion 13 , and the permanent magnet 33 has a portion facing the shaft portion An inner side surface 331 of the first inner side 331 of the first embodiment, the inner side surface 331 of the permanent magnet 33 is preferably aligned with the outer side edge 151 of the transparent portion 15; thereby, the permanent magnet 33 passes through the through hole The magnetic force line M1 on the side of the hollow portion 15 can be more dispersed to further reduce the resistance when the fan wheel 3 rotates.

Moreover, as shown in FIG. 6, the metal base 11 has an upper surface 111 facing the hub 31, and the upper surface 111 has an area corresponding to the radial rotation range D1 (ie, located in the hub 31). The area within the axial projection range, and including the transparent portion 15), the distribution area of the transparent portion 15 preferably accounts for 20% to 90% of the area of the area; In addition to the required magnetic attraction between the permanent magnet 33 and the metal base 11, the permeable portion 15 can be further utilized to effectively reduce the resistance when the fan wheel 3 rotates.

Further, as shown in FIGS. 7 and 8, the metal base 11 may be provided with a plurality of auxiliary air inlets 112, and the magnetic attraction range D2 between the permanent magnets 33 and the metal base 11 is preferably located in the above-mentioned manner. The space portion 15 is disposed between the air inlet portion 15 and the auxiliary air inlet port 112. The metal base 11 is respectively disposed on the opposite sides of the magnetic attraction range D2, and the auxiliary air inlet portion 112 and the auxiliary air inlet port 112 (which can be regarded as another Therefore, the magnetic lines M1 and M2 on both sides of the magnetic attraction range D2 can be dispersed more so that the permanent magnet 33 can more effectively reduce the resistance when the fan wheel 3 rotates. The plurality of auxiliary air inlets 112 may be selected to be outside the radial rotation range D1; or the inner peripheral walls of the plurality of auxiliary air inlets 112 respectively have an inner edge 1121, and the inner edge 1121 is the auxiliary air inlet 112. The inner peripheral wall is located closest to the axial portion 13 , and the inner edge 1121 is preferably located within the radial rotation range D1 ; thereby, the permanent magnet 33 has an outer side facing away from the shaft portion 13 . 332, in the axial direction of the fan wheel 3, the outer side 332 of the permanent magnet 33 is preferably tangential to the inner edge 1121 of the auxiliary air inlet 112; Therefore, the magnetic force line M2 of the permanent magnet 33 passing through the auxiliary air inlet 112 side can be more dispersed to further reduce the resistance when the fan wheel 3 rotates.

In summary, the heat dissipation fan of the present invention can effectively disperse the magnetic lines M1 and M2 generated by the permanent magnet 33 by the design of the transparent portion to reduce the relationship between the permanent magnet 33 and the metal base 11 . The axial magnetic attraction force, in turn, reduces the resistance when the fan wheel 3 rotates, thereby improving the smoothness of the operation.

Although the present invention has been disclosed in the above-described preferred embodiments, it is not intended to limit the present invention, and it is still within the spirit and scope of the present invention to make various modifications and modifications to the above embodiments. The technical scope of the protection is created, so the scope of protection of this creation is subject to the definition of the patent application scope attached.

1‧‧‧Fan frame

11‧‧‧Metal base

111‧‧‧Upper surface

12‧‧‧ Side wall

121‧‧‧Air inlet

122‧‧‧air outlet

13‧‧‧Axis joint

14‧‧‧ Cover

141‧‧‧Perforation

15‧‧‧The Department

151‧‧‧ outer edge

2‧‧‧stator

3‧‧‧fan wheel

31‧‧·wheels

32‧‧‧ blades

33‧‧‧ permanent magnet

331‧‧‧ inside

332‧‧‧Outside

Claims (4)

A cooling fan includes: a frame having a metal base, the metal base is provided with a shaft joint; a stator, the stator is coupled to the fan frame; and a fan wheel, the fan wheel includes a a hub, a plurality of blades and a permanent magnet, the hub being rotatably coupled to the shaft portion of the frame, the plurality of blades being coupled to an outer peripheral wall of the hub, the permanent magnet being disposed on an inner peripheral wall of the hub, and the An permanent space between the permanent magnet and the stator; wherein the hub has a radial rotation range between the hub and the metal base; and a magnetic attraction range between the permanent magnet and the metal base, the metal base is a permeable portion is disposed in the radial rotation range, the permeable portion is located outside the magnetic attraction range, the permeable portion is a plurality of through holes, and the inner peripheral walls of the plurality of through holes respectively have an outer edge, and the outer edge is The inner peripheral wall of the through hole is farthest from the axial portion; the permanent magnet has an inner side facing the axial portion; and the inner side of the permanent magnet is aligned with the through hole in the axial direction of the fan wheel Ministry Side edges. The heat dissipation fan of claim 1, wherein the metal base has an upper surface facing the hub, the upper surface having an area corresponding to the radial rotation range, and a distribution area of the transparent portion It accounts for 20% to 90% of the area. A cooling fan includes: a frame having a metal base, the metal base is provided with a shaft joint; a stator, the stator is coupled to the fan frame; and a fan wheel, the fan wheel includes a a hub, a plurality of blades and a permanent magnet, the hub being rotatably coupled to the shaft portion of the frame, the plurality of blades being coupled to an outer peripheral wall of the hub, the permanent magnet being disposed on an inner peripheral wall of the hub, and the An air gap between the permanent magnet and the stator; The radial hub has a radial rotation range between the hub and the metal base; the permanent magnet and the metal base have a magnetic absorption range, and the metal base is provided with a transparent portion in the radial rotation range. The permeable portion is located outside the magnetic attraction range, and the permeable portion is a plurality of through holes, and the inner peripheral walls of the plurality of through holes respectively have an outer edge, and the outer edge is the inner peripheral wall of the through hole from the shaft portion a farthest portion; the permanent magnet has an inner side facing the shaft portion; in an axial direction of the fan wheel, an inner side surface of the permanent magnet is aligned with a side edge of the transparent portion; the metal base is separately provided There are a plurality of auxiliary air inlets; the magnetic attraction range is located between the air permeability portion and the auxiliary air inlet, and the inner peripheral walls of the plurality of auxiliary air inlets respectively have an inner edge, and the inner edge is the inner circumferential wall distance of the auxiliary air inlet a portion closest to the shaft portion and the inner edge is located in the radial rotation range; the permanent magnet has an outer side facing away from the shaft portion; and an outer side of the permanent magnet in the axial direction of the fan wheel Aligned to the inner edges of the auxiliary intake of air. The heat dissipation fan of claim 3, wherein the metal base has an upper surface facing the hub, the upper surface having an area corresponding to the radial rotation range, and a distribution area of the transparent portion It accounts for 20% to 90% of the area.