TWI400033B - Heat dissipation fan - Google Patents

Description

Cooling fan

The invention relates to a heat dissipation fan, in particular to a rotor of a heat dissipation fan.

With the rapid development of electronic technology, the heat-generating electronic components such as the central processing unit are running faster and faster, and the heat generated during operation is also increased accordingly. To dissipate the heat to ensure the normal operation of the electronic components, the industry uses fans to the electronics. The component is cooled. The conventional fan generally includes a stator, a rotor, and a fan frame for accommodating the stator and the rotor. When energized, the magnetic field generated by the stator interacts with the rotor to drive the rotor to continuously operate relative to the stator and the fan frame, and generate wind when the blade rotates. Dissipate the heat. However, the fan has the following problems: First, in order to ensure the normal operation of the rotor, there must be a certain gap between the trailing end of the fan blade and the outer frame, so that the fan blade size is limited in a certain fan assembly space, thereby limiting the heat dissipation of the fan. Performance; Second, when the fan runs at high speed, the high-speed airflow at the end of the fan blade hits the stationary fan frame to generate a large noise.

In view of this, it is necessary to provide a cooling fan that can effectively reduce noise and obtain a larger blade design size in a limited space.

A cooling fan includes a base, a stator and a rotor. The axial sides of the fan respectively form an air inlet and an air outlet. The stator is fixed on the base. The rotor includes a hub and is disposed on the periphery of the hub. The plurality of blades further comprise a ring wall which is disposed around the periphery of the blade and connected to the tail end of the blade. The ring wall rotates with the rotor and directs the airflow generated when the fan is running from the air inlet to the air outlet side.

Compared with the prior art, in the present invention, the fan blade is connected to the ring wall, and the ring wall rotates along with the fan blade to guide the airflow to the air outlet. Since there is no gap between the fan blade and the ring wall, in the same size space, Compared with the conventional fan, the fan of the present invention can obtain a fan blade of a larger design size, thereby increasing the fan air volume. In addition, because the ring wall rotates with the rotor, the noise generated by the fan blade tail end air current hitting the stationary fan frame during the high speed operation of the conventional fan is reduced.

10, 40‧‧‧ base

12, 42‧‧‧ disc section

122, 422‧‧‧ column

14, 44‧‧ ‧ ribs

15, 45‧‧‧ air inlet

16, 46‧‧‧Locking

17, 47‧‧ vents

20‧‧‧ Stator

22‧‧‧ Stator core

24‧‧‧ coil

26‧‧‧ Circuit board

28‧‧‧Insulation frame

30, 50‧‧‧ rotor

32, 52‧‧ wheels

320‧‧‧ shaft

34‧‧‧ permanent magnet

36, 56‧‧‧ fan leaves

38, 58‧‧‧

48‧‧‧Border

581‧‧‧Guide

1 is an exploded perspective view of a first embodiment of a heat dissipation fan of the present invention.

Figure 2 is a perspective assembled view of Figure 1.

Figure 3 is a perspective view of another angle of the rotor of Figure 1.

4 is a perspective view of a base and a rotor used in a second embodiment of the heat dissipation fan of the present invention.

Referring to FIG. 1 to FIG. 3 together, the cooling fan includes a base 10, a stator 20 and a rotor 30. An air inlet port 15 and an air outlet port 17 are respectively formed on two axial sides of the fan.

The stator 20 includes a stator core 22, a coil 24, a circuit board 26, and two insulating frames 28. The stator core 22 is formed by stacking a plurality of silicon steel sheets, and includes a ring portion and a plurality of pole claws extending outward from the annular portion. The coil 24 is wound around the pole claws of the stator core 22, and the circuit board 26 is electrically connected to the coil 24. The coil 24 is powered. The two insulating frames 28 are respectively disposed at upper and lower ends of the stator core 22, and the coil 24 wound around the stator core 22 is separated from the stator core 22 to function as an insulator.

The base 10 includes a disk portion 12, a plurality of ribs 14 extending outwardly from the periphery of the disk portion 12, and a locking portion 16 provided at the end of each of the ribs 14. A center pillar 122 is protruded upward from the center of the disk portion 12, and a bearing (not shown) is received in the center pillar 122. The ribs 14 are strip-shaped and extend tangentially from the periphery of the disc portion 12 to form an end. The locking portion 16 is located at the end of the rib 14. The locking portion 16 has a cylindrical shape, and the top portion thereof communicates with the outside. The bottom portion defines a through hole for a fastener such as a screw (not shown) to pass through.

The rotor 30 includes an annular hub 32, a permanent magnet 34 attached to the inner wall of the hub 32, a plurality of blades 36 disposed around the periphery of the hub 32, and a ring wall 38 disposed around the periphery of the blade 36. A rotating shaft 320 is disposed in the center of the hub 32. The rotating shaft 320 extends vertically downward from the center of the hub 32 to form a free end. The permanent magnets 34 alternately form N and S poles in the circumferential direction. Each of the blades 36 extends radially outward from the periphery of the hub 32 to form a tail end. The ring wall 38 is annular, and is disposed around the periphery of the blade 36 and connected to the tail ends of all the blades 36, and the ring wall 38 The height is comparable to the height of the blade 36 along the axial direction of the fan to accommodate the fan blade 36 therebetween.

During assembly, the stator 20 is sleeved on the center pillar 122, the rotor 30 is disposed on the stator 20, the rotating shaft 320 of the rotor 30 is disposed in the bearing in the center pillar 122, and the rotor 30 is located inside all the locking portions 16. Upon energization, the coil 24 of the stator 20 produces an induced magnetic field that interacts with the permanent magnets 34 on the rotor 30 to drive the rotor 30 to rotate relative to the stator 20. When the rotor 30 rotates, the airflow on the air inlet 15 side is discharged to the air outlet 17 side, thereby generating an air flow to dissipate heat from the heat-generating electronic components (not shown). Compared with the prior art, in the present invention, the blade 36 is connected to the ring wall 38, and the ring wall 38 rotates along with the blade 36 to guide the airflow from the space between the ring wall 38 and the blade 36 to the side of the air outlet 17, because There is no gap between the fan blade 36 and the ring wall 38. Therefore, in the same size space, the fan blade 36 of the fan of the present invention has a larger size than the conventional fan, thereby increasing the fan air volume. In addition, since the ring wall 38 rotates together with the rotor 30, the noise generated by the collision of the airflow at the trailing end of the fan blade against the stationary fan frame during the high-speed operation of the conventional fan is reduced, so that the present invention further reduces the heat dissipation effect of the fan. The noise.

FIG. 4 shows a base 40 and a rotor 50 according to a second embodiment of the present invention. As in the above embodiment, the rotor 50 defines an air inlet 45 and an air outlet 47 along the axial sides of the fan. 40 also includes a disk portion 42, a plurality of ribs 44, and a plurality of locking portions 46. The peripheral edge of the blade 56 of the rotor 50 is provided with a ring wall 58 that is connected to the trailing ends of all of the blades 56 to receive all of the blades 56 therein. Different from the above embodiment, the base 40 further includes a frame 48 located at the periphery of the disk portion 42. The frame 48 has a square outer side and an inner side of the frame 48 is curved at four corners of the frame 48. A substantially circular opening is formed, and the disk portion 42 is located at the center of the opening. The locking portions 46 are respectively located at the four corners of the frame 48. The ribs 44 extend outward from the disk portion 42 to be connected to the frame 48, so that the disk portion 42 and the frame 48 are integrally connected. In this embodiment, The design of the frame 48 enhances the strength of the base 40, so that the heat dissipation fan is stronger. The frame 48 can also be integrally formed with the disk portion 42 and the ribs 44, and the process is simple. The height of the annular wall 58 of the rotor 50 is greater than the height of the end of the blade 56 along the axial direction of the fan. The bottom end of the annular wall 58 is flush with the bottom end of the end of the blade 56, and the top end thereof is flared outwardly on the side of the air inlet 45. Forming a guiding portion 581, the guiding portion 581 forms a tapered flow path along the air inlet 45 toward the air outlet 47, guiding more airflow into the fan, increasing the speed of the airflow, thereby reducing fan running noise and Increasing the size of the fan blade 56 further enhances fan performance.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

10‧‧‧Base

12‧‧‧Disc

122‧‧‧中柱

14‧‧‧ Ribs

16‧‧‧Locking

20‧‧‧ Stator

22‧‧‧ Stator core

24‧‧‧ coil

26‧‧‧ Circuit board

28‧‧‧Insulation frame

30‧‧‧Rotor

32‧‧·wheels

36‧‧‧ fan leaves

38‧‧‧Circle

Claims (5)

A cooling fan includes a base, a stator and a rotor. The axial sides of the fan respectively form an air inlet and an air outlet. The stator is fixed on the base. The rotor includes a hub and is disposed on the periphery of the hub. The plurality of blades are improved in that the rotor further comprises a ring wall which is disposed on the periphery of the blade and connected to the tail end of the blade, and the ring wall rotates with the rotor and directs the airflow generated by the fan to be guided from the air inlet to the air outlet side. The ring wall is outwardly flared on the air inlet side of the fan to form a guiding portion, and the guiding portion forms a tapered flow path along the air inlet to the air outlet. The heat dissipation fan of claim 1, wherein the height of the ring wall is equal to the height of the blade along the axial direction of the fan, and the upper and lower ends of the ring wall are flush with the tail end of the fan blade. The heat dissipation fan of claim 1, wherein a central portion of the base defines a disc portion, the stator is disposed on the disc portion, and a plurality of ribs are disposed on a periphery of the disc portion, and each rib is from the disc portion. The peripheral edge extends outward to form an end, and each rib end is provided with a locking portion for fixing the fan, and the rotor is located inside all the locking portions. The heat dissipating fan of claim 1, wherein a central portion of the base forms a disc portion, and a periphery of the disc portion forms a frame, and the plurality of ribs extend from the periphery of the disc portion to the frame and are connected to the frame, and the frame is arranged There are a plurality of locking portions for fixing the fan. The heat dissipation fan of claim 4, wherein the outer side of the frame is square, the inner side of the frame is curved at four corners, and the locking portion is located at four corners of the frame.