INTERNAL CIRCULATION HEAT DISSIPATION FAN

Description

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims the benefit of U.S. Provisional Ser. No. 63/738,834, filed Dec. 26, 2024, which is incorporated by reference herein.

BACKGROUND OF THE DISCLOSURE

Technical Field

This disclosure is directed to an internal circulation heat dissipation fan having an internal flow channel for dissipating heat from a stator.

Description of Related Art

A fan of related art has a waterproof stator potted with glue. It is difficult to dissipate heat from the stator potted with glue. In order to solve the issue mentioned above, another fan of related art has holes on a hub of an impeller thereof for introducing airflow into the hub to dissipate heat from the stator. In general, the hub is provided with fan blades on a lateral surface thereof, and the holes are therefore mostly arranged on a top of the hub relative to an axial direction. However, foreign objects may be sucking in through the holes when an external airflow passes through the hub.

In views of this, in order to solve the above disadvantage, the inventor studied related technology and provided a reasonable and effective solution in this disclosure.

SUMMARY OF THE INVENTION

This disclosure is directed to an internal circulation heat dissipation fan having an internal flow channel for dissipation heat from the stator.

This disclosure is directed to an internal circulation heat dissipation fan. The stator has an impeller. The stator has a coil seat. The impeller has a hub and a plurality of fan blades hub and surrounding the hub, the hub has an inner shell and an outer shell sheathing the inner shell, the coil seat is accommodated in the inner shell, an internal flow channel is defined between the inner shell and the outer shell, the internal flow channel has one side communicated with the inner shell and another side communicated to outside of the outer shell, the internal flow channel has a plurality of heat dissipation blades therein, the heat dissipation blades is annually arranged, and each of the heat dissipation blades has a side edge connected to one of the inner shell and the outer shell.

In one embodiment of this disclosure, wherein the heat dissipation blades are arranged outside of the inner shell.

In one embodiment of this disclosure, the heat dissipation blades are arranged on an internal surface of the outer shell.

In one embodiment of this disclosure, the outer shell has an outer cylinder and a top lid.

In one embodiment of this disclosure, the fan blades are arranged on an external surface of the outer cylinder.

In one embodiment of this disclosure, the heat dissipation blades are arranged on the top lid.

In one embodiment of this disclosure, at least a portion of the internal flow channel is defined between the outer cylinder and the inner shell.

In one embodiment of this disclosure, at least a portion of the internal flow channel is defined between the outer cylinder and the inner shell.

In one embodiment of this disclosure, the inner shell is tubular and opened at two ends thereof.

In one embodiment of this disclosure, the internal flow channel ha a bottom opening defined between the outer shell and the inner shell.

In one embodiment of this disclosure, the outer shell has a lateral exit disposed at a lateral side thereof and communicated with the internal flow channel.

In one embodiment of this disclosure, the stator has a base, the coil seat is fixed on the base, the hub is pivoted on the base.

In one embodiment of this disclosure, each of the heat dissipation blades has another side edge abutting against another one of the inner shell and the outer shell.

When the impeller is rotated, the fan blades may drive air to flow through an external side of the rotor, and the heat dissipation blades meanwhile introduce an airflow into the internal flow channel from the inner shell, the airflow driven by the heat dissipation blades passes the gap between coil seat and the rotor magnetic ring to cool the coil seat.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of an internal circulation heat dissipation fan according to the first embodiment of this disclosure.

FIG. 2 is a perspective view showing the internal circulation heat dissipation fan according to the first embodiment of this disclosure,

FIG. 3 is another exploded view of the internal circulation heat dissipation fan according to the first embodiment of this disclosure.

FIG. 4 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the first embodiment of this disclosure.

FIG. 5 is a cross-sectional view along a lateral direction at a cross section 5-5 as shown in FIG. 4.

FIG. 6 is a perspective view showing an internal circulation heat dissipation fan according to the second embodiment of this disclosure.

FIG. 7 is an exploded view of the internal circulation heat dissipation fan according to the second embodiment of this disclosure.

FIG. 8 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the second embodiment of this disclosure.

FIG. 9 is a cross-sectional view along a lateral direction at a cross section 9-9 as shown in FIG. 8.

FIG. 10 is a perspective view showing an internal circulation heat dissipation fan according to the third embodiment of this disclosure.

FIG. 11 is an exploded view of the internal circulation heat dissipation fan according to the third embodiment of this disclosure.

FIG. 12 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the third embodiment of this disclosure.

FIG. 13 is a cross-sectional view along a lateral direction at a cross section 13-13 as shown in FIG. 12.

FIG. 14 is a perspective view showing an internal circulation heat dissipation fan according to the fourth embodiment of this disclosure.

FIG. 15 is an exploded view of the internal circulation heat dissipation fan according to the fourth embodiment of this disclosure.

FIG. 16 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the fourth embodiment of this disclosure.

FIG. 17 is a cross-sectional view along a lateral direction at a cross section 17-17 as shown in FIG. 16.

FIG. 18 is a perspective view showing an internal circulation heat dissipation fan according to the fifth embodiment of this disclosure.

FIG. 19 is an exploded view of the internal circulation heat dissipation fan according to the fifth embodiment of this disclosure.

FIG. 20 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the fifth embodiment of this disclosure.

FIG. 21 is a cross-sectional view along a lateral direction at a cross section 21-21 as shown in FIG. 20.

FIG. 22 is a perspective view showing an internal circulation heat dissipation fan according to the sixth embodiment of this disclosure.

FIG. 23 is an exploded view of the internal circulation heat dissipation fan according to the sixth embodiment of this disclosure.

FIG. 24 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the sixth embodiment of this disclosure.

FIG. 25 is a cross-sectional view along a lateral direction at a cross section 25-25 as shown in FIG. 24.

FIG. 26 is a perspective view showing an internal circulation heat dissipation fan according to the seventh embodiment of this disclosure.

FIG. 27 is an exploded view of the internal circulation heat dissipation fan according to the seventh embodiment of this disclosure.

FIG. 28 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the seventh embodiment of this disclosure.

FIG. 29 is a cross-sectional view along a lateral direction at a cross section 29-29 as shown in FIG. 28.

DETAILED DESCRIPTION

The technical contents of this disclosure will become apparent with the detailed description of embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.

It should be understood that the orientations or positional relationships in this disclosure which are indicated by the terms such as “front side”, “rear side”, “left side”, “right side”, “front end”, “rear end”, “end”, “vertical”, “horizontal”, “top” and “bottom” are based on the orientations or positional relationships as shown in the drawings. These are only used for describing this disclosure and simplifying the description rather than indicating or implying that the device or element have a specific orientation or be constructed and operated in a specific orientation, and it should not be considered as limitations of the scopes of this disclosure.

The terms used herein without additional definition such as “substantially” and “approximately” are used to describe and illustrate small changes. When used in an event or situation, the term may include the precise moment at which the event or situation occurs, and a close approximation to moment the event or situation occurs. For example, when combined with a numerical value, the term may include a range of variation less than or equal to ±10% of the numerical value, such as less than or equal to ±5%, less than or equal to ±4%, less than or equal to ±3%, less than or equal to ±2%, less than or equal to ±1%, less than or equal to ±0.5%, less than or equal to ±0.1%, or less than or equal to ±0.05%.

Detailed descriptions and technical contents of this disclosure is described in the flowing paragraph with reference to the drawings. However, the drawings are attached only for illustration and are not intended to limit this disclosure.

FIG. 1 is an exploded view of an internal circulation heat dissipation fan according to the first embodiment of this disclosure. FIG. 2 is a perspective view showing the internal circulation heat dissipation fan according to the first embodiment of this disclosure. FIG. 3 is another exploded view of the internal circulation heat dissipation fan according to the first embodiment of this disclosure. According to FIGS. 1 to 3, the first embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. According to this embodiment, the internal circulation heat dissipation fan further has a fan frame 400 allowing the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The hub 210 is pivoted on the base 100 via a rotation shaft 201. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

According to FIGS. 2 and 3, specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 4 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the first embodiment of this disclosure. FIG. 5 is a cross-sectional view along a lateral direction at a cross section 5-5 as shown in FIG. 4. according to this embodiment as shown in FIGS. 3 to 5, the outer shell 212 has an outer cylinder 2121 and a top lid 2122, the outer cylinder 2121 is tubular and opened at two ends thereof, the top lid 2122 is a ring corresponding to other elements, and the outer cylinder 2121 has one end covered by the top lid 2122, thereby closing the end. According to this embodiment, the fan blades 220 are disposed on an external surface of the outer cylinder 2121.

The internal flow channel 204 has one portion defined between the top lid 2122 and the inner shell 211, and the internal flow channel 204 has another portion defined between the outer cylinder 2121 and the inner shell 211. According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, a bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211, and the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an external side of the inner shell 211, one of the side edges 231 of the heat dissipation blade 230 is formed as one-piece with inner shell 211, and another side edge 232 of the heat dissipation blade 230 abuts against the top lid 2122. The coil seat 300 is fixed on the base 100 and communicate in the inner shell 211. Specifically, the coil seat 300 is potted, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 5, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the bottom opening 202 through the internal flow channel 204.

FIG. 6 is a perspective view showing an internal circulation heat dissipation fan according to the second embodiment of this disclosure. FIG. 7 is an exploded view of the internal circulation heat dissipation fan according to the second embodiment of this disclosure. According to FIGS. 6 and 7, the second embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 8 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the second embodiment of this disclosure. FIG. 9 is a cross-sectional view along a lateral direction at a cross section 9-9 as shown in FIG. 8. According to this embodiment as shown in FIGS. 7 to 9, the outer shell 212 has an outer cylinder 2121 and a top lid 2122, the outer cylinder 2121 is tubular and opened at two ends thereof, the top lid 2122 is a ring corresponding to other elements, and the outer cylinder 2121 has one end covered by the top lid 2122, thereby closing the end. According to this embodiment, the fan blades 220 are disposed on an external surface of the outer cylinder 2121.

The internal flow channel 204 is defined between the top lid 2122 and the inner shell 211. According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, the outer shell 212 has a lateral exit 203 disposed at a lateral side thereof and communicated with the internal flow channel 204. According to this embodiment, an outer edge of the top lid 2122 is spaced from a top edge of the outer cylinder 2121, thereby defining a lateral exit 203 extended on a lateral surface of the hub 210.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an external side of the inner shell 211, one of the side edges 231 of the heat dissipation blade 230 is formed as one-piece with inner shell 211, and another side edge 232 of the heat dissipation blade 230 abuts against the top lid 2122.

The coil seat 300 is fixed on the base 100 and communicate in the inner shell 211. Specifically, the coil seat 300 is potted, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 9, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the lateral exit 203 through the internal flow channel 204.

FIG. 10 is a perspective view showing an internal circulation heat dissipation fan according to the third embodiment of this disclosure. FIG. 11 is an exploded view of the internal circulation heat dissipation fan according to the third embodiment of this disclosure. According to FIGS. 10 and 11, the third embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 12 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the third embodiment of this disclosure. FIG. 13 is a cross-sectional view along a lateral direction at a cross section 13-13 as shown in FIG. 12. According to this embodiment as shown in FIGS. 11 to 13, the outer shell 212 has an outer cylinder 2121 and a top lid 2122, the outer cylinder 2121 is tubular and opened at two ends thereof, the top lid 2122 is a ring corresponding to other elements, and the outer cylinder 2121 has one end covered by the top lid 2122, thereby closing the end. According to this embodiment, the fan blades 220 are disposed on an external surface of the outer cylinder 2121.

The internal flow channel 204 has one portion defined between the top lid 2122 and the inner shell 211, and the internal flow channel 204 has another portion defined between the outer cylinder 2121 and the inner shell 211. According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, the outer shell 212 has a lateral exit 203 disposed at a lateral side thereof and communicated with the internal flow channel 204, a bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211. According to this embodiment, an outer edge of the top lid 2122 is spaced from a top edge of the outer cylinder 2121, thereby defining a lateral exit 203 extended on a lateral surface of the hub 210. Furthermore, the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an external side of the inner shell 211, one of the side edges 231 of the heat dissipation blade 230 is formed as one-piece with inner shell 211, and another side edge 232 of the heat dissipation blade 230 abuts against the top lid 2122.

The coil seat 300 is fixed on the base 100 and communicate in the inner shell 211. Specifically, the coil seat 300 is potted, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 13, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the lateral exit 203 and the bottom opening 202 through the internal flow channel 204.

FIG. 14 is a perspective view showing an internal circulation heat dissipation fan according to the fourth embodiment of this disclosure. FIG. 15 is an exploded view of the internal circulation heat dissipation fan according to the fourth embodiment of this disclosure. According to FIGS. 14 and 15, the fourth embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 16 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the fourth embodiment of this disclosure. FIG. 17 is a cross-sectional view along a lateral direction at a cross section 17-17 as shown in FIG. 16. According to this embodiment as shown in FIGS. 15 to 17, the outer shell 212 has an outer cylinder 2121 and a top lid 2122, the outer cylinder 2121 is tubular and opened at two ends thereof, the top lid 2122 is a circular disk corresponding to other elements of the rotor. The top lid 2122 covers the outer cylinder 2121 to close one end of the outer cylinder 2121. According to this embodiment, the fan blades 220 are disposed on an external surface of the outer cylinder 2121.

The internal flow channel 204 has one portion defined between the top lid 2122 and the inner shell 211, and the internal flow channel 204 has another portion defined between the outer cylinder 2121 and the inner shell 211. According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, a bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211, and the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an external side of the inner shell 211, one of the side edges 231 of the heat dissipation blade 230 is formed as one-piece with inner shell 211, and another side edge 232 of the heat dissipation blade 230 abuts against the top lid 2122.

The coil seat 300 is fixed on the base 100 and accommodated in the inner shell 211, specifically, the coil seat 300 is potted coil seat, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 17, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the bottom opening 202 through the internal flow channel 204.

FIG. 18 is a perspective view showing an internal circulation heat dissipation fan according to the fifth embodiment of this disclosure. FIG. 19 is an exploded view of the internal circulation heat dissipation fan according to the fifth embodiment of this disclosure. According to FIGS. 18 and 19, the fifth embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 20 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the fifth embodiment of this disclosure. FIG. 21 is a cross-sectional view along a lateral direction at a cross section 21-21 as shown in FIG. 20. According to this embodiment as shown in FIGS. 19 to 21, the outer shell 212 has an outer cylinder 2121 and a top lid 2122, the outer cylinder 2121 is tubular and opened at two ends thereof, the top lid 2122 is a circular disk corresponding to other elements of the rotor. The outer cylinder 2121 top lid 2122 has one end covered with the outer cylinder 2121, thereby closing the end. According to this embodiment, the fan blades 220 are disposed on an external surface of the outer cylinder 2121.

The internal flow channel 204 has one portion defined between the top lid 2122 and the inner shell 211, and the internal flow channel 204 has another portion defined between the outer cylinder 2121 and the inner shell 211. According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, a bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211, and the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an internal side of the outer shell 212, one of the side edges 232 of the heat dissipation blade 230 is formed as one-piece with the top lid 2122 of the outer shell 212, and another side edge 231 of the heat dissipation blade 230 abuts against the inner shell 211.

The coil seat 300 is fixed on the base 100 and communicate in the inner shell 211. Specifically, the coil seat 300 is potted, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 21, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the bottom opening 202 through the internal flow channel 204.

FIG. 22 is a perspective view showing an internal circulation heat dissipation fan according to the sixth embodiment of this disclosure. FIG. 23 is an exploded view of the internal circulation heat dissipation fan according to the sixth embodiment of this disclosure. According to FIGS. 22 and 23, the sixth embodiment of this disclosure provides an internal circulation heat dissipation fan at least having an impeller 200 and a stator. Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the stator mentioned above to be arranged thereon.

According to this embodiment, the stator has a base 100 and a coil seat 300, the base 100 is arranged in the fan frame 400, the impeller 200 has a hub 210 and a plurality of fan blades 220. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210. According to this embodiment, the outer shell 212 may be a shell formed as one piece, and the inner shell 211 may be a shell with one opened end, a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 24 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the sixth embodiment of this disclosure. FIG. 25 is a cross-sectional view along a lateral direction at a cross section 25-25 as shown in FIG. 24. According to this embodiment as shown in FIGS. 23 to 25, the fan blades 220 are disposed on an external surface of the outer shell 212.

According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204, and the communicating opening 205 according to this embodiment has holes. A bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211, and the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an internal side of the outer shell 212, one of the side edges 232 of the heat dissipation blade 230 is formed as one-piece with the top lid 2122 of the outer shell 212, and another side edge 231 of the heat dissipation blade 230 abuts against the inner shell 211.

The coil seat 300 is fixed on the base 100 and communicate in the inner shell 211. Specifically, the coil seat 300 is potted, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 25, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the bottom opening 202 through the internal flow channel 204.

FIG. 26 is a perspective view showing an internal circulation heat dissipation fan according to the seventh embodiment of this disclosure. FIG. 27 is an exploded view of the internal circulation heat dissipation fan according to the seventh embodiment of this disclosure. According to the seventh embodiment of this disclosure as shown in FIGS. 26 and 27, the stator has a base 100 and a coil seat 300, Furthermore, the internal circulation heat dissipation fan of this embodiment may have a fan frame 400 as shown in FIG. 1 of the first embodiment to allow the impeller 200 and the coil seat 300 mentioned above to be arranged thereon.

According to this embodiment, the impeller 200 has a hub 210 and a plurality of fan blades 220. The hub 210 is pivoted on the base 100 via a rotation shaft 201. The fan blades 220 are arranged on an external surface of the hub 210 and radially disposed to surround the hub 210.

Specifically, the hub 210 mentioned above has an inner shell 211 and an outer shell 212, the outer shell 212 sheathes the inner shell 211 to form the external surface of the hub 210, the outer shell 212 may be a structure of one-piece or a structure of multi-pieces assembly. According to this embodiment, the inner shell 211 is a tube opened at two ends thereof, and a rotor magnetic ring 240 is arranged on an internal surface of the inner shell 211. The inner shell 211 is spaced from the outer shell 212 so as to define an internal flow channel 204 between the inner shell 211 and the outer shell 212.

FIG. 28 is a cross-sectional view along a lateral direction of the internal circulation heat dissipation fan according to the seventh embodiment of this disclosure. FIG. 29 is a cross-sectional view along a lateral direction at a cross section 29-29 as shown in FIG. 28. According to this embodiment as shown in FIGS. 27 and 29, the fan blades 220 are disposed on an external surface of the outer shell 212.

According to this embodiment, the internal flow channel 204 has one side communicated to an inner space of the inner shell 211, and the internal flow channel 204 has another side communicated to outside of the outer shell 212. Specifically, the inner shell 211 has a communicating opening 205 on a top end thereof to communicate a space in the inner shell 211 to the internal flow channel 204. A bottom opening 202 is defined between a lower edge of the outer shell 212 and a lower edge of the inner shell 211, and the bottom opening 202 according to this embodiment is of a ring shape.

A plurality of heat dissipation blades 230 are arranged in the internal flow channel 204, the heat dissipation blades 230 are radially arranged, each of the heat dissipation blades 230 has two side edges (231, 232) opposite to each other, and the two side edges (231, 232) are respectively connected to the inner shell 211 and outer shell 212 with connections of directly contacting or forming as one piece. According to this embodiment, the heat dissipation blades 230 are disposed on an internal side of the outer shell 212, one of the side edges 232 of the heat dissipation blade 230 is formed as one-piece with the top lid 2122 of the outer shell 212, and another side edge 231 of the heat dissipation blade 230 abuts against the inner shell 211.

The coil seat 300 is fixed on the base 100 and accommodated in the inner shell 211, specifically, the coil seat 300 is potted coil seat, the rotor magnetic ring 240 is disposed to surround the coil seat 300, and a gap is defined between the rotor magnetic ring 240 and the coil seat 300. The base 100 has a plurality of static blade 110 on a top thereof, the static blade 110 are radially arranged corresponding to a lower end of the inner shell 211 about the rotation shaft 201 as a center.

According to FIG. 29, when the impeller 200 is rotated, the fan blades 220 may drive an air to flow through an external side of the rotor, and the heat dissipation blades 230 meanwhile introduce an airflow into the internal flow channel 204 from the inner shell 211, the airflow driven by the heat dissipation blades 230 passes the gap between coil seat 300 and the rotor magnetic ring 240 to cool the coil seat 300, and the air flow is further exhausted through the internal flow channel 204. Specifically, the air flow is exhausted from the bottom opening 202 through the internal flow channel 204.

While this disclosure has been described by means of specific embodiments, numerous modifications and variations may be made thereto by those skilled in the art without departing from the scope and spirit of this disclosure set forth in the claims.