Ultra-micro fan

Abstract

An ultra-micro fan is provided. The ultra-micro fan includes an outer casing base, a substrate, a bearing seat, a plurality of coil sets, a magnetic element and a blade assembly. The substrate is disposed on the outer casing base. The bearing seat is disposed on the outer casing base. The coil sets are disposed on the substrate and surrounds the bearing seat. The blade assembly includes a hub, a rotating shaft, an impeller, and a shielding ring. The impeller is disposed on the hub. The impeller includes a plurality of blades. The rotating shaft is connected to the hub. The rotating shaft is rotatably connected to the bearing seat. The magnetic element is disposed on the blade assembly. The shielding ring is connected to the impeller. The shielding ring corresponds to and surrounds the coil sets.

Description

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 777,182, filed Mar. 25, 2025, the entirety of which is incorporated by reference herein.

[0002] This Application claims priority of China Patent Application No. 202511295574.0, filed on Sep. 11, 2025, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTIONField of the Invention

[0003] The invention relates to an ultra-micro fan, and, in particular, it relates to an ultra-micro fan with noise reduction effect.Description of the Related Art

[0004] A conventional ultra-micro fan usually includes a plurality of coil sets to provide the electromagnetic force required to rotate the blades. Due to structural limitations and requirements on the arrangement of parts, there may be gaps between the coil sets. When the fan operates at high speed, airflow passes through these gaps and tends to generate unstable vortex airflow. The vortex airflow may repeatedly cause disturbance between the coil sets, resulting in a non-uniform distribution of airflow velocity, thereby reducing air outlet efficiency. Meanwhile, the generation of vortex airflow may also cause airflow resonance or turbulence, leading to increased noise during operation of the fan, which is incompatible with quiet system design. Such vortex airflow problems have become one of the critical challenges in fan design that cannot be ignored, particularly in applications such as wearable devices or mobile devices, where extremely high requirements for size, silence, and heat dissipation efficiency exist. Therefore, how to suppress the generation of vortex airflow and improve airflow stability and the operating silence of the fan is an important issue that needs to be improved in this technical field.BRIEF SUMMARY OF THE INVENTION

[0005] An embodiment of the invention provides an ultra-micro fan. The ultra-micro fan includes an outer casing base, a substrate, a bearing seat, a plurality of coil sets, a magnetic element, and a blade assembly. The substrate is disposed on the outer casing base. The bearing seat is disposed on the outer casing base. The coil sets are disposed on the substrate and surround the bearing seat. The blade assembly includes a hub, a rotating shaft, an impeller and a shielding ring. The impeller is disposed on the hub. The impeller includes a plurality of blades. The rotating shaft is connected to the hub. The rotating shaft is rotatably connected to the bearing seat. The magnetic element is disposed on the blade assembly. The shielding ring is connected to the impeller. The shielding ring corresponds to and surrounds the coil sets. The height of at least a portion of the shielding ring is lower than the height of the magnetic element.

[0006] In one embodiment, a first gap is formed between the bottom of the shielding ring and the substrate, the first gap is 0.2 mm to 1 mm, a second gap is formed between the inner wall of the shielding ring and the nearest coil set, and the second gap is 0.2 mm to 1 mm.

[0007] In one embodiment, an air gap is formed between the magnetic element and the coil sets, and the air gap extends along the radial direction of the blade assembly.

[0008] In one embodiment, the hub includes a shaft seat and a hub flange, the hub flange surrounds the shaft seat, the impeller includes an opening, the shaft seat passes through the opening, and the hub flange is connected to the impeller.

[0009] In one embodiment, the magnetic element is disposed on the hub flange.

[0010] In one embodiment, the impeller further includes a blade mounting portion, the blades are connected to the blade mounting portion, the blade mounting portion is connected to the hub flange, and the shielding ring is connected to the blade mounting portion.

[0011] In one embodiment, a fillet transition is formed at the connection between the blade mounting portion and the shielding ring.

[0012] In one embodiment, each blade includes a blade upper section and a blade lower section. The blade upper section is connected to the blade mounting portion and extends upward. The blade lower section is connected to the shielding ring and extends downward.

[0013] In one embodiment, the height of at least a portion of the blade lower section is lower than the height of the magnetic element, and the blade lower section corresponds to the coil sets.

[0014] In one embodiment, the ultra-micro fan further includes a bearing, wherein the bearing is disposed in the bearing seat, the rotating shaft is inserted into the bearing, and there is no magnetic element disposed between the bearing seat and the hub.

[0015] In the ultra-micro fan according to the embodiment of the invention, the shielding ring is disposed on the impeller of the blade assembly. The shielding ring correspondingly surrounds the coil sets, and the height of at least a portion of shielding ring is lower than the height of the magnetic element. Thus, a stable airflow guiding structure is formed for the fan operates. This design helps suppress vortex flows generated in the gaps between the coil sets, thereby improving the stability and directionality of airflow. Experimental results show that, compared with traditional designs without a shielding ring, the ultra-micro fan proposed in the embodiment of the invention can effectively reduce broadband noise by about 2 dB during operation, thereby significantly improving quietness. Meanwhile, the shielding ring also provides a certain protective effect, preventing external particles from entering the coil area, enhancing dustproof performance, and contributing to prolonging the lifespan and maintaining long-term operational stability of the fan. Overall, the ultra-micro fan according to the embodiment of the invention achieves substantial technical progress in enhancing fan quietness, airflow efficiency, and dustproof reliability.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

[0017] FIG. 1 is a perspective view of an ultra-micro fan according to an embodiment of the invention;

[0018] FIG. 2A is an exploded view of the ultra-micro fan according to the embodiment of the invention;

[0019] FIG. 2B is a partial exploded view of the ultra-micro fan according to the embodiment of the invention;

[0020] FIG. 3 is a partial sectional view of the ultra-micro fan according to the embodiment of the invention;

[0021] FIG. 4 shows a peripheral structure of the shielding ring according to the embodiment of the invention; and

[0022] FIG. 5 shows a detailed structure of the hub according to the embodiment of the invention.DETAILED DESCRIPTION OF THE INVENTION

[0023] The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0024] FIG. 1 is a perspective view showing an ultra-micro fan according to an embodiment of the invention. FIG. 2A is an exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 2B is a partial exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 3 is a partial sectional view showing the ultra-micro fan according to the embodiment of the invention. With reference to FIGS. 1, 2A, 2B, and 3, the ultra-micro fan F according to the embodiment of the invention includes an outer casing base 1, a substrate 2, a bearing seat 11, a plurality of coil sets 3, a magnetic element 4, and a blade assembly 5. The substrate 2 is disposed on the outer casing base 1. The bearing seat 11 is disposed on the outer casing base 1. The coil sets 3 are disposed on the substrate 2 and surround the bearing seat 11. The blade assembly 5 includes a hub 51, a rotating shaft 52, an impeller 53 and a shielding ring 54. The impeller 53 is disposed on the hub 51. The impeller 53 includes a plurality of blades 531. The rotating shaft 52 is connected to the hub 51. The rotating shaft 52 is rotatably connected to the bearing seat 11. The magnetic element 4 is disposed on the blade assembly 5. The shielding ring 54 is connected to the impeller 53. The shielding ring 54 corresponds to and surrounds the coil sets 3. The height of at least a portion of the shielding ring 54 is lower than the height of the magnetic element 4.

[0025] In one embodiment, the number of the coil sets 3 is four. The disclosure is not meant to restrict the invention.

[0026] FIG. 4 shows a peripheral structure of the shielding ring according to the embodiment of the invention. With reference to FIG. 4, in one embodiment, a first gap g1 is formed between the bottom of the shielding ring 54 and the substrate 2, and the first gap g1 is 0.2 mm to 1 mm. In one embodiment, the shielding ring 54 can provide noise reduction and dustproof effects. The disclosure is not meant to restrict the invention.

[0027] With reference to FIG. 4, in one embodiment, a second gap g2 is formed between the inner wall of the shielding ring 54 and the nearest coil set 3, and the second gap g2 is 0.2 mm to 1 mm. The disclosure is not meant to restrict the invention.

[0028] With reference to FIG. 3, in one embodiment, an air gap A is formed between the magnetic element 4 and the coil sets 3, and the air gap A extends along the radial direction of the blade assembly 5. Accordingly, an ultra-micro design purpose can be achieved. In one embodiment, the size of the ultra-micro fan is 5 mm to 20 mm. The disclosure is not meant to restrict the invention.

[0029] FIG. 5 is a view showing a detailed structure of the hub according to the embodiment of the invention. With reference to FIGS. 2A, 2B, 3, and 5, in one embodiment, the hub 51 includes a shaft seat 511 and a hub flange 512. The hub flange 512 surrounds the shaft seat 511. The impeller 53 includes an opening 532. The shaft seat 511 passes through the opening 532. The hub flange 512 is connected to the impeller 53.

[0030] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the magnetic element 4 is disposed on the hub flange 512.

[0031] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the impeller 53 further includes a blade mounting portion 533. The blades 531 are connected to the blade mounting portion 533, and the blade mounting portion 533 is connected to the hub flange 512.

[0032] With reference to FIGS. 3 and 4, in one embodiment, the shielding ring 54 is connected to the blade mounting portion 533.

[0033] With reference to FIGS. 3 and 4, in one embodiment, a fillet transition 534 is formed at the connection between the blade mounting portion 533 and the shielding ring 54. The fillet transition 534 is utilized to avoid stress concentration, to prolong the lifespan of the blade assembly 5, and to reduce turbulent flow. The disclosure is not meant to restrict the invention.

[0034] With reference to FIG. 4, in one embodiment, each blade 531 includes a blade upper section 531A and a blade lower section 531B. The blade upper section 531A is connected to the blade mounting portion 533 and extends upward. The blade lower section 531B is connected to the shielding ring 54 and extends downward.

[0035] With reference to FIG. 4, in one embodiment, the height of at least a portion of the blade lower section 531B is lower than the height of the magnetic element 4, and the blade lower section 531B corresponds to the coil sets 3.

[0036] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the ultra-micro fan further includes a bearing 12. The bearing 12 is disposed in the bearing seat 11, and the rotating shaft 52 is inserted into the bearing 12.

[0037] With reference to FIG. 3, in one embodiment, there is no magnetic element disposed between the bearing seat 11 and the hub 51. Accordingly, the axial height of the fan can be reduced to achieve an ultra-micro design purpose. The disclosure is not meant to restrict the invention.

[0038] In the ultra-micro fan according to the embodiment of the invention, the shielding ring is disposed on the impeller of the blade assembly. The shielding ring correspondingly surrounds the coil sets, and the height of at least a portion of shielding ring is lower than the height of the magnetic element. Thus, a stable airflow guiding structure is formed for the fan operates. This design helps suppress vortex flows generated in the gaps between the coil sets, thereby improving the stability and directionality of airflow. Experimental results show that, compared with traditional designs without a shielding ring, the ultra-micro fan proposed in the embodiment of the invention can effectively reduce broadband noise by about 2 dB during operation, thereby significantly improving quietness. Meanwhile, the shielding ring also provides a certain protective effect, preventing external particles from entering the coil area, enhancing dustproof performance, and contributing to prolonging the lifespan and maintaining long-term operational stability of the fan. Overall, the ultra-micro fan according to the embodiment of the invention achieves substantial technical progress in enhancing fan quietness, airflow efficiency, and dustproof reliability.

[0039] While the invention has been described by way of example and in terms of the preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Examples

Embodiment Construction

[0023]The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0024]FIG. 1 is a perspective view showing an ultra-micro fan according to an embodiment of the invention. FIG. 2A is an exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 2B is a partial exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 3 is a partial sectional view showing the ultra-micro fan according to the embodiment of the invention. With reference to FIGS. 1, 2A, 2B, and 3, the ultra-micro fan F according to the embodiment of the invention includes an outer casing base 1, a substrate 2, a bearing seat 11, a plurality of coil sets 3, a magnetic element 4, and a blade assembly 5. The substrate 2 is disposed on the outer casing base 1. The bearing seat 11 is di...

CROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Application No. 63 / 777,182, filed Mar. 25, 2025, the entirety of which is incorporated by reference herein.

[0002] This Application claims priority of China Patent Application No. 202511295574.0, filed on Sep. 11, 2025, the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTIONField of the Invention

[0003] The invention relates to an ultra-micro fan, and, in particular, it relates to an ultra-micro fan with noise reduction effect.Description of the Related Art

[0004] A conventional ultra-micro fan usually includes a plurality of coil sets to provide the electromagnetic force required to rotate the blades. Due to structural limitations and requirements on the arrangement of parts, there may be gaps between the coil sets. When the fan operates at high speed, airflow passes through these gaps and tends to generate unstable vortex airflow. The vortex airflow may repeatedly cause disturbance between the coil sets, resulting in a non-uniform distribution of airflow velocity, thereby reducing air outlet efficiency. Meanwhile, the generation of vortex airflow may also cause airflow resonance or turbulence, leading to increased noise during operation of the fan, which is incompatible with quiet system design. Such vortex airflow problems have become one of the critical challenges in fan design that cannot be ignored, particularly in applications such as wearable devices or mobile devices, where extremely high requirements for size, silence, and heat dissipation efficiency exist. Therefore, how to suppress the generation of vortex airflow and improve airflow stability and the operating silence of the fan is an important issue that needs to be improved in this technical field.BRIEF SUMMARY OF THE INVENTION

[0005] An embodiment of the invention provides an ultra-micro fan. The ultra-micro fan includes an outer casing base, a substrate, a bearing seat, a plurality of coil sets, a magnetic element, and a blade assembly. The substrate is disposed on the outer casing base. The bearing seat is disposed on the outer casing base. The coil sets are disposed on the substrate and surround the bearing seat. The blade assembly includes a hub, a rotating shaft, an impeller and a shielding ring. The impeller is disposed on the hub. The impeller includes a plurality of blades. The rotating shaft is connected to the hub. The rotating shaft is rotatably connected to the bearing seat. The magnetic element is disposed on the blade assembly. The shielding ring is connected to the impeller. The shielding ring corresponds to and surrounds the coil sets. The height of at least a portion of the shielding ring is lower than the height of the magnetic element.

[0006] In one embodiment, a first gap is formed between the bottom of the shielding ring and the substrate, the first gap is 0.2 mm to 1 mm, a second gap is formed between the inner wall of the shielding ring and the nearest coil set, and the second gap is 0.2 mm to 1 mm.

[0007] In one embodiment, an air gap is formed between the magnetic element and the coil sets, and the air gap extends along the radial direction of the blade assembly.

[0008] In one embodiment, the hub includes a shaft seat and a hub flange, the hub flange surrounds the shaft seat, the impeller includes an opening, the shaft seat passes through the opening, and the hub flange is connected to the impeller.

[0009] In one embodiment, the magnetic element is disposed on the hub flange.

[0010] In one embodiment, the impeller further includes a blade mounting portion, the blades are connected to the blade mounting portion, the blade mounting portion is connected to the hub flange, and the shielding ring is connected to the blade mounting portion.

[0011] In one embodiment, a fillet transition is formed at the connection between the blade mounting portion and the shielding ring.

[0012] In one embodiment, each blade includes a blade upper section and a blade lower section. The blade upper section is connected to the blade mounting portion and extends upward. The blade lower section is connected to the shielding ring and extends downward.

[0013] In one embodiment, the height of at least a portion of the blade lower section is lower than the height of the magnetic element, and the blade lower section corresponds to the coil sets.

[0014] In one embodiment, the ultra-micro fan further includes a bearing, wherein the bearing is disposed in the bearing seat, the rotating shaft is inserted into the bearing, and there is no magnetic element disposed between the bearing seat and the hub.

[0015] In the ultra-micro fan according to the embodiment of the invention, the shielding ring is disposed on the impeller of the blade assembly. The shielding ring correspondingly surrounds the coil sets, and the height of at least a portion of shielding ring is lower than the height of the magnetic element. Thus, a stable airflow guiding structure is formed for the fan operates. This design helps suppress vortex flows generated in the gaps between the coil sets, thereby improving the stability and directionality of airflow. Experimental results show that, compared with traditional designs without a shielding ring, the ultra-micro fan proposed in the embodiment of the invention can effectively reduce broadband noise by about 2 dB during operation, thereby significantly improving quietness. Meanwhile, the shielding ring also provides a certain protective effect, preventing external particles from entering the coil area, enhancing dustproof performance, and contributing to prolonging the lifespan and maintaining long-term operational stability of the fan. Overall, the ultra-micro fan according to the embodiment of the invention achieves substantial technical progress in enhancing fan quietness, airflow efficiency, and dustproof reliability.BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

[0017] FIG. 1 is a perspective view of an ultra-micro fan according to an embodiment of the invention;

[0018] FIG. 2A is an exploded view of the ultra-micro fan according to the embodiment of the invention;

[0019] FIG. 2B is a partial exploded view of the ultra-micro fan according to the embodiment of the invention;

[0020] FIG. 3 is a partial sectional view of the ultra-micro fan according to the embodiment of the invention;

[0021] FIG. 4 shows a peripheral structure of the shielding ring according to the embodiment of the invention; and

[0022] FIG. 5 shows a detailed structure of the hub according to the embodiment of the invention.DETAILED DESCRIPTION OF THE INVENTION

[0023] The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0024] FIG. 1 is a perspective view showing an ultra-micro fan according to an embodiment of the invention. FIG. 2A is an exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 2B is a partial exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 3 is a partial sectional view showing the ultra-micro fan according to the embodiment of the invention. With reference to FIGS. 1, 2A, 2B, and 3, the ultra-micro fan F according to the embodiment of the invention includes an outer casing base 1, a substrate 2, a bearing seat 11, a plurality of coil sets 3, a magnetic element 4, and a blade assembly 5. The substrate 2 is disposed on the outer casing base 1. The bearing seat 11 is disposed on the outer casing base 1. The coil sets 3 are disposed on the substrate 2 and surround the bearing seat 11. The blade assembly 5 includes a hub 51, a rotating shaft 52, an impeller 53 and a shielding ring 54. The impeller 53 is disposed on the hub 51. The impeller 53 includes a plurality of blades 531. The rotating shaft 52 is connected to the hub 51. The rotating shaft 52 is rotatably connected to the bearing seat 11. The magnetic element 4 is disposed on the blade assembly 5. The shielding ring 54 is connected to the impeller 53. The shielding ring 54 corresponds to and surrounds the coil sets 3. The height of at least a portion of the shielding ring 54 is lower than the height of the magnetic element 4.

[0025] In one embodiment, the number of the coil sets 3 is four. The disclosure is not meant to restrict the invention.

[0026] FIG. 4 shows a peripheral structure of the shielding ring according to the embodiment of the invention. With reference to FIG. 4, in one embodiment, a first gap g1 is formed between the bottom of the shielding ring 54 and the substrate 2, and the first gap g1 is 0.2 mm to 1 mm. In one embodiment, the shielding ring 54 can provide noise reduction and dustproof effects. The disclosure is not meant to restrict the invention.

[0027] With reference to FIG. 4, in one embodiment, a second gap g2 is formed between the inner wall of the shielding ring 54 and the nearest coil set 3, and the second gap g2 is 0.2 mm to 1 mm. The disclosure is not meant to restrict the invention.

[0028] With reference to FIG. 3, in one embodiment, an air gap A is formed between the magnetic element 4 and the coil sets 3, and the air gap A extends along the radial direction of the blade assembly 5. Accordingly, an ultra-micro design purpose can be achieved. In one embodiment, the size of the ultra-micro fan is 5 mm to 20 mm. The disclosure is not meant to restrict the invention.

[0029] FIG. 5 is a view showing a detailed structure of the hub according to the embodiment of the invention. With reference to FIGS. 2A, 2B, 3, and 5, in one embodiment, the hub 51 includes a shaft seat 511 and a hub flange 512. The hub flange 512 surrounds the shaft seat 511. The impeller 53 includes an opening 532. The shaft seat 511 passes through the opening 532. The hub flange 512 is connected to the impeller 53.

[0030] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the magnetic element 4 is disposed on the hub flange 512.

[0031] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the impeller 53 further includes a blade mounting portion 533. The blades 531 are connected to the blade mounting portion 533, and the blade mounting portion 533 is connected to the hub flange 512.

[0032] With reference to FIGS. 3 and 4, in one embodiment, the shielding ring 54 is connected to the blade mounting portion 533.

[0033] With reference to FIGS. 3 and 4, in one embodiment, a fillet transition 534 is formed at the connection between the blade mounting portion 533 and the shielding ring 54. The fillet transition 534 is utilized to avoid stress concentration, to prolong the lifespan of the blade assembly 5, and to reduce turbulent flow. The disclosure is not meant to restrict the invention.

[0034] With reference to FIG. 4, in one embodiment, each blade 531 includes a blade upper section 531A and a blade lower section 531B. The blade upper section 531A is connected to the blade mounting portion 533 and extends upward. The blade lower section 531B is connected to the shielding ring 54 and extends downward.

[0035] With reference to FIG. 4, in one embodiment, the height of at least a portion of the blade lower section 531B is lower than the height of the magnetic element 4, and the blade lower section 531B corresponds to the coil sets 3.

[0036] With reference to FIGS. 2A, 2B, and 3, in one embodiment, the ultra-micro fan further includes a bearing 12. The bearing 12 is disposed in the bearing seat 11, and the rotating shaft 52 is inserted into the bearing 12.

[0037] With reference to FIG. 3, in one embodiment, there is no magnetic element disposed between the bearing seat 11 and the hub 51. Accordingly, the axial height of the fan can be reduced to achieve an ultra-micro design purpose. The disclosure is not meant to restrict the invention.

[0038] In the ultra-micro fan according to the embodiment of the invention, the shielding ring is disposed on the impeller of the blade assembly. The shielding ring correspondingly surrounds the coil sets, and the height of at least a portion of shielding ring is lower than the height of the magnetic element. Thus, a stable airflow guiding structure is formed for the fan operates. This design helps suppress vortex flows generated in the gaps between the coil sets, thereby improving the stability and directionality of airflow. Experimental results show that, compared with traditional designs without a shielding ring, the ultra-micro fan proposed in the embodiment of the invention can effectively reduce broadband noise by about 2 dB during operation, thereby significantly improving quietness. Meanwhile, the shielding ring also provides a certain protective effect, preventing external particles from entering the coil area, enhancing dustproof performance, and contributing to prolonging the lifespan and maintaining long-term operational stability of the fan. Overall, the ultra-micro fan according to the embodiment of the invention achieves substantial technical progress in enhancing fan quietness, airflow efficiency, and dustproof reliability.

[0039] While the invention has been described by way of example and in terms of the preferred embodiments, it should be understood that the invention is not limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Examples

Embodiment Construction

[0023]The following description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.

[0024]FIG. 1 is a perspective view showing an ultra-micro fan according to an embodiment of the invention. FIG. 2A is an exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 2B is a partial exploded view showing the ultra-micro fan according to the embodiment of the invention. FIG. 3 is a partial sectional view showing the ultra-micro fan according to the embodiment of the invention. With reference to FIGS. 1, 2A, 2B, and 3, the ultra-micro fan F according to the embodiment of the invention includes an outer casing base 1, a substrate 2, a bearing seat 11, a plurality of coil sets 3, a magnetic element 4, and a blade assembly 5. The substrate 2 is disposed on the outer casing base 1. The bearing seat 11 is di...

Claims

1. An ultra-micro fan, comprising:an outer casing base;a substrate, disposed on the outer casing base;a bearing seat, disposed on the outer casing base;a plurality of coil sets, disposed on the substrate and surrounding the bearing seat;a magnetic element; anda blade assembly, comprising a hub, a rotating shaft, an impeller and a shielding ring, wherein the impeller is disposed on the hub, the impeller comprises a plurality of blades, the rotating shaft is connected to the hub, the rotating shaft is rotatably connected to the bearing seat, the magnetic element is disposed on the blade assembly, the shielding ring is connected to the impeller, the shielding ring corresponds to and surrounds the coil sets, and a height of at least a portion of the shielding ring is lower than a height of the magnetic element.

2. The ultra-micro fan as claimed in claim 1, wherein a first gap is formed between a bottom of the shielding ring and the substrate, the first gap is 0.2 mm to 1 mm, a second gap is formed between an inner wall of the shielding ring and the nearest coil set, and the second gap is 0.2 mm to 1 mm.

3. The ultra-micro fan as claimed in claim 1, wherein an air gap is formed between the magnetic element and the coil sets, and the air gap extends along a radial direction of the blade assembly.

4. The ultra-micro fan as claimed in claim 1, wherein the hub comprises a shaft seat and a hub flange, the hub flange surrounds the shaft seat, the impeller comprises an opening, the shaft seat passes through the opening, and the hub flange is connected to the impeller.

5. The ultra-micro fan as claimed in claim 4, wherein the magnetic element is disposed on the hub flange.

6. The ultra-micro fan as claimed in claim 5, wherein the impeller further comprises a blade mounting portion, the blades are connected to the blade mounting portion, the blade mounting portion is connected to the hub flange, and the shielding ring is connected to the blade mounting portion.

7. The ultra-micro fan as claimed in claim 6, wherein a fillet transition is formed at a connection between the blade mounting portion and the shielding ring.

8. The ultra-micro fan as claimed in claim 6, wherein each blade comprises a blade upper section and a blade lower section, the blade upper section is connected to the blade mounting portion and extends upward, and the blade lower section is connected to the shielding ring and extends downward.

9. The ultra-micro fan as claimed in claim 8, wherein the height of at least a portion of the blade lower section is lower than the height of the magnetic element, and the blade lower section corresponds to the coil sets.

10. The ultra-micro fan as claimed in claim 4, further comprising a bearing, wherein the bearing is disposed in the bearing seat, the rotating shaft is inserted into the bearing, and there is no magnetic element disposed between the bearing seat and the hub.

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