Internal circulation heat dissipation fan

Abstract

This disclosure provides an internal circulation heat dissipation fan having a stator and an impeller. The impeller has a hub and multiple blades arranged around the hub, the hub having an inner shell and an outer shell sheathing the inner shell, the stator 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 side communicated to a space in the inner shell and another side communicated to outside of the outer shell, multiple heat dissipation vents are arranged in the internal flow channel and annually disposed. Each heat dissipation vent has two opposite edges respectively connected to the inner shell and the outer shell.

Description

[Technical Field]

[0001] This disclosure relates to fans, and more particularly to an internal circulation cooling fan with an internal flow channel for stator heat dissipation. [Previous Technology]

[0002] Modern fans often use potted stators for waterproofing. However, potted stators are not good at heat dissipation. To solve this problem, some modern fans have vents in the hub of their impellers to introduce airflow into the hub for stator cooling. Since the fan blades are located on the side of the hub, the vents are generally located at the top of the hub's axial direction. However, when external airflow passes through the hub, there is a risk of foreign objects being sucked into the vents.

[0003] In view of the above, the inventors have devoted themselves to researching and applying theoretical principles to solve the above-mentioned problems in the prior art, which is the goal of the inventors' improvement. [Summary of the Invention]

[0004] This disclosure provides an internal circulation cooling fan with an internal flow channel for stator heat dissipation.

[0005] This disclosure provides an internal circulation cooling fan, which includes a stator and an impeller. The stator includes a coil assembly. The impeller includes a hub and a plurality of fan blades arranged around the hub. The hub has an inner casing and an outer casing nested within the inner casing. The coil assembly is housed within the inner casing. An internal flow channel is formed between the inner casing and the outer casing. One side of the internal flow channel communicates with the inside of the inner casing and the other side communicates with the outside of the outer casing. A plurality of cooling blades are disposed within the internal flow channel. These cooling blades are arranged in a ring, and one side edge of each cooling blade is connected to one of the inner casing and the outer casing.

[0006] In one embodiment of this disclosure, the heat dissipation fins are disposed on the outer side of the inner casing.

[0007] In one embodiment of this disclosure, the heat dissipation fins are disposed on the inner side of the outer casing.

[0008] In one embodiment of this disclosure, the outer casing includes an outer cylinder and a top cover.

[0009] In one embodiment of this disclosure, the fan blades are disposed on the outer side of the outer cylinder.

[0010] In one embodiment of this disclosure, the heat dissipation blades are disposed on the top cover.

[0011] In one embodiment of this disclosure, at least a portion of the inner flow channel is defined between the top cover and the inner casing.

[0012] In one embodiment of this disclosure, at least a portion of the inner flow channel is defined between the outer cylinder and the inner casing.

[0013] In one embodiment of this disclosure, the inner cover is a cylindrical body with open ends.

[0014] In one embodiment of this disclosure, a bottom opening communicating with the inner flow channel is formed between the outer cover and the inner cover.

[0015] In one embodiment of this disclosure, a side outlet communicating with the inner flow channel is formed on the side of the outer casing.

[0016] In one embodiment of this disclosure, the stator includes a base, the coil assembly is fixed to the base, and the hub is pivotally mounted on the base.

[0017] In one embodiment of this disclosure, the two opposite side edges of each heat dissipation blade are respectively connected to the inner cover and the outer cover.

[0018] When the impeller rotates, the fan blades drive the airflow through the outside of the rotor, while the heat dissipation blades introduce the air in the inner casing into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades passes through the gap between the coil group and the rotor magnetic ring to cool the coil group.

Implementation Method

[0019] In the description of this disclosure, it should be understood that the terms "front side", "rear side", "left side", "right side", "front end", "rear end", "end", "longitudinal", "lateral", "vertical", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting conditions of this disclosure.

[0020] Unless otherwise defined herein, the terms "substantially" and "approximately" are used to describe and narrate small changes. When used in connection with an event or situation, the term may include the exact moment the event or situation occurred, or the point to which the event or situation occurred. For example, when used in connection 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%.

[0021] The detailed description and technical content of this disclosure will be explained in conjunction with the drawings below. However, the drawings are for illustrative purposes only and are not intended to limit this disclosure.

[0022] Figure 1 is an exploded perspective view of one of the internal circulation cooling fans according to the first embodiment of the present disclosure. Figure 2 is an exploded perspective view of one of the internal circulation cooling fans according to the first embodiment of the present disclosure. Figure 3 is another exploded perspective view of the internal circulation cooling fan according to the first embodiment of the present disclosure. Referring to Figures 1 to 3, the first embodiment of the present disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. In this embodiment, the internal circulation cooling fan also includes a fan frame 400 for accommodating the aforementioned impeller 200 and stator.

[0023] In this embodiment, the stator includes a base 100 and a coil assembly 300. The base 100 is disposed within the fan frame 400. The impeller 200 includes a hub 210 and a plurality of fan blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot shaft 201. The fan blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0024] Referring to Figures 2 and 3, specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is overlaid on the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0025] Figure 4 is a transverse sectional view of one of the internal circulation cooling fans of the first embodiment disclosed herein. Figure 5 is a longitudinal sectional view at section line 5-5 shown in Figure 4. Referring to Figures 3 to 5, in this embodiment, the outer casing 212 includes an outer cylinder 2121 and a top cover 2122. The outer cylinder 2121 is a cylinder open at both ends. The top cover 2122 is arranged in an annular shape to match the shape of other rotor components and covers the outer cylinder 2121 to close one end of the outer cylinder 2121. In this embodiment, the fan blades 220 are disposed outside the outer cylinder 2121.

[0026] A portion of the inner flow channel 204 is defined between the top cover 2122 and the inner shell 211, while another portion is defined between the outer cylinder 2121 and the inner shell 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner shell 211, and the other side of the inner flow channel 204 communicates with the outside of the outer shell 212. Specifically, the top of the inner shell 211 has a connecting opening 205 to connect the internal space of the inner shell 211 to the inner flow channel 204, and a bottom opening 202 communicating with the inner flow channel 204 is formed between the bottom edge of the outer shell 212 and the bottom edge of the inner shell 211. In this embodiment, the bottom opening 202 is annular.

[0027] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or integrally formed. In this embodiment, these heat dissipation blades 230 are disposed on the outer side of the inner cover 211. One side edge 231 of the heat dissipation blade 230 is integrally formed with the inner cover 211, and the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122. The coil assembly 300 is fixed to the base 100 and housed within the inner cover 211. Specifically, the coil assembly 300 is potted and encapsulated, and the rotor magnetic ring 240 is arranged around the coil assembly 300 with a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of air guides 110, which correspond to the bottom end of the inner cover 211 and are arranged in a ring around the pivot 201.

[0028] Referring to Figure 5, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, and at the same time, the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the bottom opening 202 after passing through the inner flow channel 204.

[0029] Figure 6 is a perspective view of one of the internal circulation cooling fans according to the second embodiment of the present disclosure. Figure 7 is an exploded perspective view of one of the internal circulation cooling fans according to the second embodiment of the present disclosure. Referring to Figures 6 and 7, the second embodiment of the present disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Moreover, the internal circulation cooling fan of the present disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and stator.

[0030] In this embodiment, the stator includes a base 100 and a coil assembly 300, and the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0031] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is nested over the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0032] Figure 8 is a transverse sectional view of one of the internal circulation cooling fans according to the second embodiment of the present disclosure. Figure 9 is a longitudinal sectional view at section line 9-9 shown in Figure 8. Referring to Figures 7 to 9, in this embodiment, the outer casing 212 includes an outer cylinder 2121 and a top cover 2122. The outer cylinder 2121 is a cylinder open at both ends. The top cover 2122 is arranged in an annular shape to match the shape of other rotor components and covers the outer cylinder 2121 to close one end of the outer cylinder 2121. In this embodiment, the fan blades 220 are disposed outside the outer cylinder 2121.

[0033] The inner flow channel 204 is defined between the top cover 2122 and the inner shell 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner shell 211, and the other side of the inner flow channel 204 communicates with the outside of the outer shell 212. Specifically, the top of the inner shell 211 has a connecting opening 205 to connect the internal space of the inner shell 211 to the inner flow channel 204, and the side of the outer shell 212 forms a side outlet 203 communicating with the inner flow channel 204. In this embodiment, the outer edge of the top cover 2122 and the top edge of the outer cylinder 2121 are spaced apart to form a side outlet 203 extending around the side of the hub 210.

[0034] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or integrally formed. In this embodiment, these heat dissipation blades 230 are disposed on the outer side of the inner cover 211. One side edge 231 of the heat dissipation blade 230 is integrally formed with the inner cover 211, and the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0035] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is encapsulated with potting compound, and the rotor magnetic ring 240 is arranged around the coil assembly 300 with a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0036] Referring to Figure 9, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, and at the same time, the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the side outlet 203 after passing through the inner flow channel 204.

[0037] Figure 10 is a perspective view of one of the internal circulation cooling fans according to the third embodiment of this disclosure. Figure 11 is an exploded perspective view of one of the internal circulation cooling fans according to the third embodiment of this disclosure. Referring to Figures 10 and 11, the third embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Moreover, the internal circulation cooling fan of this disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and stator.

[0038] In this embodiment, the stator includes a base 100 and a coil assembly 300, and the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0039] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is nested outside the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0040] Figure 12 is a transverse sectional view of one of the internal circulation cooling fans according to the third embodiment of this disclosure. Figure 13 is a longitudinal sectional view at section line 13-13 shown in Figure 12. Referring to Figures 11 to 13, in this embodiment, the outer casing 212 includes an outer cylinder 2121 and a top cover 2122. The outer cylinder 2121 is a cylinder open at both ends. The top cover 2122 is arranged in an annular shape to match the shape of other rotor components and covers the outer cylinder 2121 to close one end of the outer cylinder 2121. In this embodiment, the fan blades 220 are disposed outside the outer cylinder 2121.

[0041] A portion of the inner flow channel 204 is defined between the top cover 2122 and the inner shell 211, while another portion of the inner flow channel 204 is defined between the outer cylinder 2121 and the inner shell 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner shell 211, and the other side of the inner flow channel 204 communicates with the outside of the outer shell 212. Specifically, the top of the inner shell 211 has a connecting opening 205 to connect the internal space of the inner shell 211 to the inner flow channel 204, the side of the outer shell 212 forms a side outlet 203 communicating with the inner flow channel 204, and a bottom opening 202 communicating with the inner flow channel 204 is formed between the bottom edge of the outer shell 212 and the bottom edge of the inner shell 211. In this embodiment, the outer edge of the top cover 2122 and the top edge of the outer cylinder 2121 are spaced apart to form a side outlet 203 extending around the side of the hub 210, and the bottom opening 202 is annular.

[0042] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or integrally formed. In this embodiment, these heat dissipation blades 230 are disposed on the outer side of the inner cover 211. One side edge 231 of the heat dissipation blade 230 is integrally formed with the inner cover 211, and the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0043] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is encapsulated with potting compound, and the rotor magnetic ring 240 is arranged around the coil assembly 300 with a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0044] Referring to Figure 13, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, and at the same time, the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the side outlet 203 and the bottom opening 202 after passing through the inner flow channel 204.

[0045] Figure 14 is a perspective view of one of the internal circulation cooling fans according to the fourth embodiment of this disclosure. Figure 15 is an exploded perspective view of one of the internal circulation cooling fans according to the fourth embodiment of this disclosure. Referring to Figures 14 and 15, the fourth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Moreover, the internal circulation cooling fan of this disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and stator.

[0046] In this embodiment, the stator includes a base 100 and a coil assembly 300, and the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0047] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is nested outside the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0048] Figure 16 is a transverse sectional view of one of the internal circulation cooling fans according to the fourth embodiment of this disclosure. Figure 17 is a longitudinal sectional view at section line 17-17 shown in Figure 16. Referring to Figures 15 to 17, in this embodiment, the outer casing 212 includes an outer cylinder 2121 and a top cover 2122. The outer cylinder 2121 is a cylinder open at both ends. The top cover 2122 is configured in a disc shape to match the shape of other rotor components, and the top cover 2122 covers the outer cylinder 2121 to close one end of the outer cylinder 2121. In this embodiment, the fan blades 220 are disposed outside the outer cylinder 2121.

[0049] A portion of the inner flow channel 204 is defined between the top cover 2122 and the inner shell 211, while another portion is defined between the outer cylinder 2121 and the inner shell 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner shell 211, and the other side of the inner flow channel 204 communicates with the outside of the outer shell 212. Specifically, the top of the inner shell 211 has a connecting opening 205 to connect the internal space of the inner shell 211 to the inner flow channel 204, and a bottom opening 202 communicating with the inner flow channel 204 is formed between the bottom edge of the outer shell 212 and the bottom edge of the inner shell 211. In this embodiment, the bottom opening 202 is annular.

[0050] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or integrally formed. In this embodiment, these heat dissipation blades 230 are disposed on the outer side of the inner cover 211. One side edge 231 of the heat dissipation blade 230 is integrally formed with the inner cover 211, and the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0051] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is a potted and encapsulated coil assembly, with the rotor magnetic ring 240 arranged around the coil assembly 300 and a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0052] Referring to Figure 17, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, and at the same time, the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the bottom opening 202 after passing through the inner flow channel 204.

[0053] Figure 18 is a perspective view of one of the internal circulation cooling fans according to the fifth embodiment of this disclosure. Figure 19 is an exploded perspective view of one of the internal circulation cooling fans according to the fifth embodiment of this disclosure. Referring to Figures 18 and 19, the fifth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Moreover, the internal circulation cooling fan of this disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and stator.

[0054] In this embodiment, the stator includes a base 100 and a coil assembly 300, and the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0055] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is nested over the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0056] Figure 20 is a transverse sectional view of one of the internal circulation cooling fans according to the fifth embodiment of this disclosure. Figure 21 is a longitudinal sectional view at section line 21-21 shown in Figure 20. Referring to Figures 19 to 21, in this embodiment, the outer casing 212 includes an outer cylinder 2121 and a top cover 2122. The outer cylinder 2121 is a cylinder open at both ends. The top cover 2122 is configured in a disc shape to match the shape of other rotor components, and the top cover 2122 covers the outer cylinder 2121 to close one end of the outer cylinder 2121. In this embodiment, the fan blades 220 are disposed outside the outer cylinder 2121.

[0057] A portion of the inner flow channel 204 is defined between the top cover 2122 and the inner shell 211, while another portion of the inner flow channel 204 is defined between the outer cylinder 2121 and the inner shell 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner shell 211, and the other side of the inner flow channel 204 communicates with the outside of the outer shell 212. Specifically, the top of the inner shell 211 has a connecting opening 205 to connect the internal space of the inner shell 211 to the inner flow channel 204, and a bottom opening 202 communicating with the inner flow channel 204 is formed between the bottom edge of the outer shell 212 and the bottom edge of the inner shell 211. In this embodiment, the bottom opening 202 is annular.

[0058] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or an integrally formed structure. In this embodiment, these heat dissipation blades 230 are disposed on the inner side of the outer cover 212. One side edge 232 of the heat dissipation blade 230 is integrally formed with the top cover 2122 of the outer cover 212, and the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0059] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is encapsulated with potting compound, and the rotor magnetic ring 240 is arranged around the coil assembly 300 with a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0060] Referring to Figure 21, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, while the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the bottom opening 202 after passing through the inner flow channel 204.

[0061] Figure 22 is a perspective view of one of the internal circulation cooling fans according to the sixth embodiment of this disclosure. Figure 23 is an exploded perspective view of one of the internal circulation cooling fans according to the sixth embodiment of this disclosure. Referring to Figures 22 and 23, the sixth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Moreover, the internal circulation cooling fan of this disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and stator.

[0062] In this embodiment, the stator includes a base 100 and a coil assembly 300, and the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0063] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212, with the outer cover 212 nested over the inner cover 211 to form the outer surface of the hub 210. In this embodiment, the outer cover 212 is a one-piece cover, and the inner cover 211 is an open-end cover. A rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between them.

[0064] FIG24 is a transverse sectional view of one of the internal circulation cooling fans according to the sixth embodiment of the present disclosure. FIG25 is a longitudinal sectional view at section line 25-25 shown in FIG24. Referring to FIG23 to FIG25, in this embodiment, the fan blades 220 are disposed outside the outer casing 212.

[0065] In this embodiment, one side of the inner flow channel 204 connects to the internal space of the inner cover 211, and the other side of the inner flow channel 204 connects to the outside of the outer cover 212. Specifically, the top of the inner cover 211 has a plurality of connecting openings 205 to connect the internal space of the inner cover 211 to the inner flow channel 204. In this embodiment, the connecting openings 205 are holes. A bottom opening 202 connecting the inner flow channel 204 is formed between the bottom edge of the outer cover 212 and the bottom edge of the inner cover 211. In this embodiment, the bottom opening 202 is annular.

[0066] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or an integrally formed structure. In this embodiment, these heat dissipation blades 230 are disposed on the inner side of the outer cover 212. One side edge 232 of the heat dissipation blade 230 is integrally formed with the top cover 2122 of the outer cover 212, and the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0067] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is encapsulated with potting compound, and the rotor magnetic ring 240 is arranged around the coil assembly 300 with a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0068] Referring to Figure 25, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, and at the same time, the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the bottom opening 202 after passing through the inner flow channel 204.

[0069] Figure 26 is a perspective view of one of the internal circulation cooling fans according to the seventh embodiment of this disclosure. Figure 27 is an exploded perspective view of one of the internal circulation cooling fans according to the seventh embodiment of this disclosure. Referring to Figures 26 and 27, the seventh embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a coil assembly 300. Moreover, the internal circulation cooling fan of this disclosure may also include a fan frame 400 as shown in Figure 1 of the first embodiment for accommodating the aforementioned impeller 200 and coil assembly 300.

[0070] In this embodiment, the impeller 200 includes a hub 210 and a plurality of blades 220. The hub 210 is pivotally mounted on the base 100 via a pivot 201. The blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0071] Specifically, the aforementioned hub 210 has an inner cover 211 and an outer cover 212. The outer cover 212 is fitted over the inner cover 211 to form the outer surface of the hub 210. The outer cover 212 can be a single-piece structure or a multi-piece assembled structure. In this embodiment, the inner cover 211 is a cylindrical body open at both ends, and a rotor magnetic ring 240 is provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart to form an inner flow channel 204 between the inner cover 211 and the outer cover 212.

[0072] FIG28 is a transverse sectional view of one of the internal circulation cooling fans of the seventh embodiment disclosed herein. FIG29 is a longitudinal sectional view at section line 29-29 shown in FIG28. Referring to FIG27 to FIG29, in this embodiment, the fan blades 220 are disposed outside the outer casing 212.

[0073] In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner cover 211, and the other side of the inner flow channel 204 communicates with the outside of the outer cover 212. Specifically, the top of the inner cover 211 has a connecting opening 205 to connect the internal space of the inner cover 211 to the inner flow channel 204. A bottom opening 202 communicating with the inner flow channel 204 is formed between the bottom edge of the outer cover 212 and the bottom edge of the inner cover 211. In this embodiment, the bottom opening 202 is annular.

[0074] A plurality of heat dissipation blades 230 are provided within the inner flow channel 204. These heat dissipation blades 230 are arranged in a ring, and each heat dissipation blade 230 has two opposing side edges 231, 232. The two side edges 231, 232 are respectively connected to the inner cover 211 and the outer cover 212. The connection can be abutting or integrally formed. In this embodiment, these heat dissipation blades 230 are disposed on the inner side of the outer cover 212. One side edge 232 of the heat dissipation blade 230 is integrally formed with the top cover 2122 of the outer cover 212, and the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0075] The coil assembly 300 is fixed to the base 100 and housed within the inner casing 211. Specifically, the coil assembly 300 is a potted and encapsulated coil assembly, with the rotor magnetic ring 240 arranged around the coil assembly 300 and a gap between the rotor magnetic ring 240 and the coil assembly 300. The top surface of the base 100 is provided with a plurality of guide vanes 110, which correspond to the bottom end of the inner casing 211 and are arranged in a ring around the rotating shaft 201.

[0076] Referring to Figure 29, when the impeller 200 rotates, the fan blades 220 can drive the airflow through the outside of the rotor, while the heat dissipation blades 230 can introduce the air in the inner casing 211 into the inner flow channel 204 to form an airflow. The airflow driven by the heat dissipation blades 230 passes through the gap between the coil group 300 and the rotor magnetic ring 240 to cool the coil group 300. The airflow is further discharged after passing through the inner flow channel 204. Specifically, the airflow is discharged from the bottom opening 202 after passing through the inner flow channel 204.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the patent scope of the present invention. Other equivalent variations that utilize the patent spirit of the present invention shall all fall within the patent scope of the present invention. [Simplified Explanation of the Diagram]

[0078] Figure 1 is a perspective exploded view of one of the internal circulation cooling fans of the first embodiment disclosed herein.

[0079] Figure 2 is a perspective view of one of the internal circulation cooling fans of the first embodiment disclosed herein.

[0080] Figure 3 is another exploded perspective view of the internal circulation cooling fan of the first embodiment disclosed herein.

[0081] Figure 4 is a cross-sectional view of one of the internal circulation cooling fans of the first embodiment disclosed herein.

[0082] Figure 5 is a longitudinal sectional view at section line 5-5 shown in Figure 4.

[0083] Figure 6 is a perspective view of one of the internal circulation cooling fans of the second embodiment disclosed herein.

[0084] Figure 7 is a perspective exploded view of one of the internal circulation cooling fans of the second embodiment disclosed herein.

[0085] Figure 8 is a cross-sectional view of one of the internal circulation cooling fans of the second embodiment disclosed herein.

[0086] Figure 9 is a longitudinal sectional view at section line 9-9 shown in Figure 8.

[0087] Figure 10 is a perspective view of one of the internal circulation cooling fans of the third embodiment disclosed herein.

[0088] Figure 11 is a perspective exploded view of one of the internal circulation cooling fans of the third embodiment disclosed herein.

[0089] Figure 12 is a cross-sectional view of one of the internal circulation cooling fans of the third embodiment disclosed herein.

[0090] Figure 13 is a longitudinal sectional view at section line 13-13 shown in Figure 12.

[0091] Figure 14 is a perspective view of one of the internal circulation cooling fans of the fourth embodiment disclosed herein.

[0092] Figure 15 is an exploded perspective view of one of the internal circulation cooling fans of the fourth embodiment disclosed herein.

[0093] Figure 16 is a cross-sectional view of one of the internal circulation cooling fans of the fourth embodiment disclosed herein.

[0094] Figure 17 is a longitudinal sectional view at section line 17-17 shown in Figure 16.

[0095] Figure 18 is a perspective view of one of the internal circulation cooling fans of the fifth embodiment disclosed herein.

[0096] Figure 19 is a perspective exploded view of one of the internal circulation cooling fans of the fifth embodiment disclosed herein.

[0097] Figure 20 is a cross-sectional view of one of the internal circulation cooling fans of the fifth embodiment disclosed herein.

[0098] Figure 21 is a longitudinal sectional view at section line 21-21 shown in Figure 20.

[0099] Figure 22 is a perspective view of one of the internal circulation cooling fans of the sixth embodiment disclosed herein.

[0100] Figure 23 is a perspective exploded view of one of the internal circulation cooling fans of the sixth embodiment disclosed herein.

[0101] Figure 24 is a cross-sectional view of one of the internal circulation cooling fans of the sixth embodiment disclosed herein.

[0102] Figure 25 is a longitudinal sectional view at section line 25-25 shown in Figure 24.

[0103] Figure 26 is a perspective view of one of the internal circulation cooling fans of the seventh embodiment disclosed herein.

[0104] Figure 27 is a perspective exploded view of one of the internal circulation cooling fans of the seventh embodiment disclosed herein.

[0105] Figure 28 is a cross-sectional view of one of the internal circulation cooling fans of the seventh embodiment disclosed herein.

[0106] Figure 29 is a longitudinal sectional view at section line 29-29 shown in Figure 28.

Claims

1. An internal circulation cooling fan, comprising: A stator includes a coil assembly; and an impeller including a hub and a plurality of blades arranged around the hub. The hub has an inner casing and an outer casing nested within the inner casing. The coil assembly is housed within the inner casing. An internal flow channel is formed between the inner casing and the outer casing. One side of the internal flow channel communicates with the interior of the inner casing and the other side communicates with the exterior of the outer casing. A plurality of heat dissipation blades are disposed within the internal flow channel. These heat dissipation blades are arranged in a ring, and one side edge of each heat dissipation blade is connected to one of the inner casing and the outer casing. The stator includes a base, the coil assembly is fixed to the base, and the hub is pivotally mounted on the base via a pivot. A plurality of guide vanes are provided on the top surface of the base. These guide vanes are arranged in a ring around the bottom end of the inner casing and centered on the pivot.

2. The internal circulation cooling fan as described in claim 1, wherein the cooling fins are disposed on the outside of the inner casing.

3. The internal circulation cooling fan as described in claim 1, wherein the cooling blades are disposed inside the outer casing.

4. The internal circulation cooling fan as described in claim 1, wherein the outer casing includes an outer cylinder and a top cover.

5. An internal circulation cooling fan as described in claim 4, wherein the fan blades are disposed outside the outer casing.

6. An internal circulation cooling fan as described in claim 4, wherein the cooling fins are disposed on the top cover.

7. The internal circulation cooling fan as described in claim 4, wherein at least a portion of the internal flow channel is defined between the top cover and the inner casing.

8. The internal circulation cooling fan as described in claim 4, wherein at least a portion of the internal flow channel is defined between the outer cylinder and the inner casing.

9. The internal circulation cooling fan as described in claim 4, wherein the inner casing is a cylindrical body open at both ends.

10. The internal circulation cooling fan as described in claim 1, wherein a bottom opening communicating with the internal flow channel is formed between the outer casing and the inner casing.

11. The internal circulation cooling fan as described in claim 1, wherein the side of the outer casing has a side outlet communicating with the internal flow channel.

12. The internal circulation cooling fan as described in claim 1, wherein the opposite side edge of each of the cooling blades abuts against the other of the inner casing and the outer casing.