TW201500653A - Balanceable fan - Google Patents

Abstract

A balanceable fan comprises a frame, a stator, and an impeller. The frame has a balance member. The stator has a substrate and a coil. The impeller rotatably couples with the shaft-coupling portion and has a permanent magnet. A gap is formed between the permanent magnet and the coli of the stator. Within the permanent magnet of the impeller has a magnetic force area. The magnetic force area is opposite to the balance member in axial direction. The substrate is disposed between the permanent magnet and the balance member to cover at least a part of the magnetic force area. In accordance with the above structure, it's solves the problem of the large magnetic force since to the permanent magnet faced to the balance member. The resistant force in the rotated impeller can be reduced and promotes the quality of fan's running.

Description

Cooling fan with balance function

The present invention relates to a heat dissipation fan, and more particularly to a heat dissipation fan that ensures a smooth rotation of a fan wheel.

It is known that there is a motor structure of a balance sheet, such as the new patent case of "brushless DC motor construction" of the Republic of China Announcement No. 423760. Referring to FIG. 1 , the conventional motor 8 generally includes a base 81 , a stator 82 , a rotor 83 , and a balance piece 84 . The base 81 has a shaft tube 811; the stator 82 is coupled to the outer peripheral wall of the shaft tube 811; the rotor 83 is provided with a shaft 831 and a permanent magnet 832, wherein the rotor 83 is rotatable by the shaft 831 The balance tube 84 is made of a magnetically permeable material, and the balance piece 84 is disposed on the base 81 and maintains a magnetic spacing (G) with the permanent magnet 832. Therefore, a magnetic attraction can be formed between the balance piece 84 and the permanent magnet 832, thereby facilitating the smooth rotation of the rotor 83.

When the conventional motor 8 is applied to the heat dissipation fan, the balance wheel 84 ensures that the fan wheel of the heat dissipation fan rotates smoothly; however, since the balance piece 84 is disposed between the base 81 and the permanent magnet 832, Therefore, it is difficult for the conventional motor 8 to further reduce the overall axial height; therefore, the conventional cooling fan is designed to be lighter, thinner and shorter, and the balance piece 84 must be sleeved and coupled to the base during assembly. The shaft tube 811 of the seat 81 also causes inconvenience in assembly.

In addition, the invention patent of "Motor and cooling fan with the motor" of the Republic of China Announcement No. I384732. Referring to FIG. 2, the conventional motor 9 includes a balance member. 91, a stator 92 and a rotor 93. The balance member 91 is provided with a shaft portion 911 and a magnetic sensing portion 912. The stator 92 is coupled to the balance member 91. The rotor 93 includes a rotating shaft 931 and a permanent magnet 932. The rotating shaft 931 is coupled to the shaft portion 911. The permanent magnet 932 and the magnetic sensitive portion 912 of the balancer 91 are magnetically attracted to each other. Thereby, the balance member 91 can be used to maintain the balanced rotation of the rotor 93.

When the above-mentioned other conventional motor 9 is applied to a heat dissipation fan, the balance member 91 is used. The fan frame base of the conventional heat dissipation fan is directly replaced, so that the balance piece 91 and the permanent magnet 932 of the rotor 93 do not need to be provided with a conventional balance piece, so as to effectively reduce the overall axial height of the heat dissipation fan and improve assembly. Convenience. However, it is easy for the permanent magnet 932 of the conventional motor 9 and the balance member 91 to be too large and directly opposed to each other, so that the axial magnetic attraction between the permanent magnet 932 and the balance member 91 is excessive. When the motor 9 is applied to a heat dissipating fan, the axial magnetic attraction force tends to increase the resistance when the fan wheel rotates, thereby affecting the operation quality of the cooling fan.

The main object of the present invention is to provide a cooling fan with a balance function for effectively reducing the axial magnetic attraction between the permanent magnet and the balance member.

In order to achieve the foregoing object, the cooling fan with balanced function of the present invention comprises at least one frame, a certain subgroup and a fan wheel. The fan frame includes a balance member, the outer peripheral edge of the balance member is provided with an outer frame portion, the outer frame portion is provided with an air inlet and an air outlet, and the balance member is provided with a shaft joint portion; the stator assembly includes a substrate and a coil assembly; and the fan wheel includes a central shaft and a permanent magnet rotatably coupled to the shaft portion, the permanent magnet forming an air gap with the coil assembly of the stator group; wherein the fan wheel The permanent magnet has an outer annular surface and an inner annular surface, and a magnetic attraction range is formed between the outer annular surface and the inner annular surface, the magnetic attraction range is axially opposite to the balance member, and the substrate of the stator assembly is located at the permanent Between the magnet and the balance member, for shielding at least a portion of the magnetic attraction range.

The air gap between the permanent magnet and the coil assembly of the stator set is an axial air gap or a radial air gap.

The outer circumference of the substrate of the stator set is located in or beyond the magnetic attraction range.

The surface of the substrate of the stator assembly forms the coil assembly, and the substrate is a wiring substrate, and the coil assembly is electrically connected to a driving circuit.

The stator assembly further includes at least one silicon steel sheet and an insulating sleeve. The surface of the substrate is provided with a driving circuit to form a circuit substrate. The insulating package is coupled to the outside of the silicon steel sheet, and the coil assembly is wound around the insulating package.

The outer circumference of the substrate of the stator set is provided with a plurality of notches.

The outer circumference of the substrate of the stator set is provided with a plurality of trimming edges.

The outer frame portion of the fan frame is combined with a cover plate, and the cover plate is provided with a through hole opposite to the air inlet of the outer frame portion.

The substrate of the stator set can shield at least a portion of the magnetic absorption range by using the above-mentioned cooling fan with a balance function, so as to solve the problem that the magnetic attraction between the permanent magnet and the balance member is excessively generated due to direct relative The utility model can effectively reduce the resistance when the fan wheel rotates, thereby improving the running quality of the cooling fan.

〔this invention〕

1‧‧‧Fan frame

11‧‧‧ Balance pieces

111‧‧‧Auxiliary air inlet

12‧‧‧Outer frame

121‧‧‧Air inlet

122‧‧‧air outlet

13‧‧‧Axis joint

14‧‧‧ Cover

141‧‧‧through hole

2‧‧‧stator group

21‧‧‧Substrate

211‧‧‧ outer periphery

22‧‧‧ coil group

3‧‧‧fan wheel

31‧‧‧ center axis

32‧‧‧ permanent magnet

321‧‧‧ outer annulus

322‧‧‧ Inner torus

4‧‧‧stator group

41‧‧‧Substrate

411‧‧‧ outer periphery

412‧‧‧ gap

413‧‧‧ trimming

42‧‧‧矽Steel sheet

43‧‧‧Insulation Kit

44‧‧‧ coil group

D‧‧‧Magnetic range

[study]

8‧‧‧Motor

81‧‧‧Base

811‧‧‧ shaft tube

82‧‧‧ Stator

821‧‧ wheels

83‧‧‧Rotor

831‧‧‧ shaft

832‧‧‧ permanent magnet

84‧‧‧ Balance film

G‧‧‧Magnetic spacing

9‧‧‧Motor

91‧‧‧ Balance pieces

911‧‧‧Axis joint

912‧‧‧Magnetic part

92‧‧‧ Stator

93‧‧‧Rotor

931‧‧‧Rotary axis

932‧‧‧ permanent magnet

Figure 1 is a combined cross-sectional view of a first conventional motor.

Figure 2 is a combined cross-sectional view of a second conventional motor.

3 is an exploded perspective view of a cooling fan with a balance function according to a first preferred embodiment of the present invention.

Fig. 4 is a sectional view showing the combination of a cooling fan having a balance function according to a first preferred embodiment of the present invention.

Fig. 5 is an exploded perspective view showing a cooling fan with a balance function according to a second preferred embodiment of the present invention.

Fig. 6 is a sectional view showing the combination of a cooling fan having a balance function according to a second preferred embodiment of the present invention.

FIG. 7 is a top plan view showing another preferred embodiment of the substrate of the cooling fan with balanced function according to the present invention.

FIG. 8 is a top plan view showing still another preferred embodiment of the substrate of the cooling fan with balanced function according to the present invention.

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

Referring to FIGS. 3 and 4, the cooling fan with balance function according to the first preferred embodiment of the present invention includes at least one frame 1, a certain subgroup 2, and a fan wheel 3. The fan frame 1 is a frame structure capable of introducing and extracting airflow, such as an axial fan frame, a centrifugal fan frame, or a horizontal convection fan frame. In the preferred embodiment, the fan frame 1 is a centrifugal fan. 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 to drive the fan wheel 3 to rotate by the stator set 2.

The fan frame 1 can be a hollow frame structure that can be accommodated in the stator set 2 and the fan wheel 3 and can be introduced in the axial direction and in the radial direction. The hollow frame structure can be various geometric shapes. The structural design, such as a polygon, a circle or an ellipse, etc.; in the preferred embodiment, the frame 1 is a square frame structure.

The fan frame 1 mainly includes a balance member 11 , and the balance member 11 is a member that can be magnetically attracted to a permanent magnet. For example, the balance member 11 can be a metal plate or the like; the outer periphery of the balance member 11 is provided with a The outer frame portion 12 is provided with an air inlet 121 and an air outlet 122 for introducing and extracting airflow, and the balance member 11 is provided with a shaft joint portion 13 to For the above-mentioned fan wheel 3 combined.

Moreover, the outer frame portion 12 of the fan frame 1 is preferably combined with a cover plate 14 The through hole 141 is opposite to the air inlet 121 of the outer frame portion 12.

The stator set 2 is disposed inside the fan frame 1 and coupled to the balance member 11; wherein the stator set 2 is of various structural designs for driving the fan wheel 3 to rotate after the combination of the fan wheel 3 is used. In the preferred embodiment, the stator assembly 2 has a substrate 21, and the substrate 21 is coupled to the outer periphery of the shaft portion 13. The surface of the substrate 21 can be provided with at least one coil group 22 by way of wiring, electroforming, or the like. The substrate 21 can be configured as a wiring substrate. The coil assembly 22 is electrically connected to a driving circuit (not shown) for driving the fan wheel 3 to rotate.

The fan wheel 3 is provided with a central shaft 31 and a permanent magnet 32, and the central shaft 31 The air gap is formed in the axial joint between the permanent magnet 32 and the coil assembly 22 of the stator assembly 2. In the preferred embodiment, the air gap is an axial air gap.

Moreover, please refer to FIG. 4, the permanent magnet 32 of the above-mentioned fan wheel 3 has An outer annular surface 321 and an inner annular surface 322 are formed. A magnetic attraction range D is formed between the outer annular surface 321 and the inner annular surface 322. The magnetic attraction range D is axially opposite to the balance member 11. Between the permanent magnet 32 and the balance member 11 for shielding at least a portion of the magnetic attraction range D. More specifically, the substrate 21 has an outer peripheral edge 211, and the outer peripheral edge 211 can be located in the magnetic attraction range D or Exceeding the magnetic attraction range D; in the preferred embodiment, the outer periphery 211 of the substrate 21 extends beyond the magnetic attraction range D to shield all of the magnetic absorption range D.

Please refer to FIGS. 5 and 6 for the balance function of the second preferred embodiment of the present invention. The cooling fan can also include a frame 1, a certain subgroup 4 and a fan wheel 3. The structural features and composition of the fan frame 1 and the fan wheel 3 are substantially the same as those of the first preferred embodiment described above, and are not described herein.

The stator assembly 4 of the second preferred embodiment of the present invention comprises a substrate 41, at least one A silicon steel sheet 42, an insulating sleeve 43, and a coil assembly 44. A driving circuit is disposed on a surface of the substrate 41 to form a circuit substrate, and the silicon steel sheet 42 may be a single member, or the silicon steel sheet 42 may be a plurality of The insulating package 43 is integrally formed on the outside of the silicon steel sheet 42 . The coil assembly 44 is wound around the insulating sleeve 43 . The substrate 41 is also located between the permanent magnet 32 and the balance member 11 for shielding. At least a portion of the magnetic attraction range D is lived. Furthermore, the balance member 11 of the embodiment may preferably be provided with at least one auxiliary air inlet 111 to increase the air intake amount of the heat dissipation fan.

Moreover, referring again to FIG. 6, in the preferred embodiment, the coil assembly 44 Forming a radial air gap with the permanent magnet 32, compared with the first preferred embodiment shown in FIG. 4, the corresponding magnet of the permanent magnet 32 and the balance member 11 of the heat dissipating fan having a radial air gap The suction area is relatively small. Therefore, in order to ensure that the balance member 11 can maintain the basic balance and stability of the fan wheel 3, in the preferred embodiment, the outer circumference 411 of the substrate 41 is located in the magnetic attraction range D. The substrate 41 is used to shield only a portion of the magnetic attraction range D; more specifically, as shown in FIG. 7, the outer periphery 411 of the substrate 41 is preferably provided with a plurality of notches 412, or As shown in FIG. 8, the outer periphery 411 of the substrate 41 is preferably provided with a plurality of trimming edges 413, so that the permanent magnet 32 can pass through the substrate 41 only under the condition that only one part of the magnetic attraction range D is shielded. The notch 412 or the trim 413 maintains a predetermined magnetic attraction effect with the balance member 11, so that the fan wheel 3 can simultaneously have the advantages of rotational balance and smooth rotation.

Based on the above technical concept of a cooling fan with a balanced function, the present invention can be The balance member 11 directly replaces the base of the fan frame of the conventional heat dissipation fan, thereby achieving various functions such as reducing structural complexity, improving assembly convenience, reducing manufacturing cost, and reducing axial height; wherein the balance member 11 and the permanent are utilized. The magnetic attraction of the magnets 32 enables the cooling fan of the present invention to properly maintain the rotational balance and rotational stability of the fan wheel 3 during operation, stationary or starting; more importantly, the cooling fan of the present invention can further borrow The substrate 21, 41 of the stator sets 2, 4 shields at least a portion of the magnetic attraction range D to solve the problem that the permanent magnet 32 and the balance member 11 are excessively magnetically generated. The resistance of the fan wheel 3 is reduced, thereby improving the running quality 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‧‧‧Fan frame

11‧‧‧ Balance pieces

12‧‧‧Outer frame

121‧‧‧Air inlet

122‧‧‧air outlet

13‧‧‧Axis joint

14‧‧‧ Cover

141‧‧‧through hole

2‧‧‧stator group

21‧‧‧Substrate

211‧‧‧ outer periphery

22‧‧‧ coil group

3‧‧‧fan wheel

31‧‧‧ center axis

32‧‧‧ permanent magnet

321‧‧‧ outer annulus

322‧‧‧ Inner torus

D‧‧‧Magnetic range

Claims (11)

A cooling fan with a balance function, comprising: a frame, comprising a balance member, the outer peripheral edge of the balance member is provided with an outer frame portion, the outer frame portion is provided with an air inlet and an air outlet, and the balance member is provided with a a shaft portion; a certain subgroup comprising a substrate and a coil assembly; and a fan wheel including a central shaft and a permanent magnet rotatably coupled to the shaft portion, the permanent magnet and the stator assembly An air gap is formed between the coil groups; wherein the permanent magnet of the fan wheel has an outer annular surface and an inner annular surface, and a magnetic attraction range is formed between the outer annular surface and the inner annular surface, the magnetic absorption range and the balance The members are axially opposed to each other, and the substrate of the stator assembly is located between the permanent magnet and the balance member for shielding at least a portion of the magnetic attraction range. A cooling fan having a balancing function according to the first aspect of the patent application, wherein an air gap between the permanent magnet and the coil group of the stator group is an axial air gap. A cooling fan having a balancing function according to claim 1 of the patent application, wherein an air gap between the permanent magnet and the coil group of the stator group is a radial air gap. A cooling fan having a balanced function according to claim 1, 2 or 3, wherein an outer circumference of the substrate of the stator group is located in the magnetic attraction range. A cooling fan having a balanced function according to claim 1, 2 or 3, wherein an outer circumference of the substrate of the stator group exceeds the magnetic attraction range. The heat dissipating fan having the balance function according to the first, second or third aspect of the patent application, wherein the substrate surface of the stator group forms the coil group, the substrate is a wiring substrate, and the coil group is electrically connected to a driving circuit. A cooling fan having a balance function according to the first, second or third aspect of the patent application, wherein the stator assembly further comprises at least one silicon steel sheet and an insulation kit, the substrate surface is provided with a driving circuit to form a circuit substrate, and the insulation The kit is attached to the outside of the silicon steel sheet. The coil assembly is wound around the insulation kit. A cooling fan having a balanced function according to claim 1, 2 or 3, wherein the outer circumference of the substrate of the stator set is provided with a plurality of notches. A cooling fan having a balanced function according to claim 1, 2 or 3, wherein the outer circumference of the substrate of the stator set is provided with a plurality of trimming edges. According to the heat-dissipating fan with the balance function of claim 1, 2 or 3, wherein the outer frame portion of the fan frame is combined with a cover plate, the cover plate is provided with a through hole, and the through hole and the outer frame portion are inserted The tuyere is opposite. A cooling fan having a balanced function according to claim 1, 2 or 3, wherein the balance member is provided with at least one auxiliary air inlet.