Internal circulation heat dissipation fan

Abstract

This disclosure provides an internal circulation cooling fan, comprising a stator and an impeller. The stator includes a coil assembly. The impeller includes 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, and an internal flow channel is formed between the inner and outer casings. 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 cooling blades are disposed within the internal flow channel, the cooling blades being arranged in a ring, and one side edge of each cooling blade connecting to one of the inner and outer casings.

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. Background 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 guide 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 this, the inventor has devoted himself to researching and applying theoretical principles to address the aforementioned problems in the prior art, which is the target of the inventor's 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, comprising a stator and an impeller. The stator includes a coil assembly. The impeller includes 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, and an internal flow channel is formed between the inner and outer casings. 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 cooling blades are disposed within the internal flow channel, and the cooling blades are arranged in a ring, with one side edge of each cooling blade connected to one of the inner and outer casings.

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

[0007] In one embodiment of this disclosure, a plurality of the heat dissipation blades 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, a plurality of the fan blades are disposed on the outer side of the outer cylinder.

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

[0011] In one embodiment of this disclosure, at least a portion of the internal 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 casing is a cylindrical body open at both ends.

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

[0015] In one embodiment of this disclosure, a side outlet communicating with the internal 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 opposite side edge of each of the heat dissipation blades abuts against another of the inner or outer casing.

[0018] When the impeller rotates, the fan blades drive the airflow through the outside of the rotor, while the heat dissipation blades introduce air from the inner casing into the airflow to form an airflow. The airflow driven by the heat dissipation blades cools the coil assembly by passing through the gap between the coil assembly and the rotor magnetic ring. Attached Figure Description

[0019] Figure 1 This is an exploded perspective view of an internal circulation cooling fan according to the first embodiment of this disclosure.

[0020] Figure 2 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the first embodiment of this disclosure.

[0021] Figure 3 This is another exploded perspective view of the internal circulation cooling fan according to the first embodiment of this disclosure.

[0022] Figure 4 This is a cross-sectional view of an internal circulation cooling fan according to the first embodiment of this disclosure.

[0023] Figure 5 yes Figure 4 The longitudinal sectional view at section line 5-5 is shown.

[0024] Figure 6 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to a second embodiment of the present disclosure.

[0025] Figure 7 This is an exploded perspective view of an internal circulation cooling fan according to the second embodiment of the present disclosure.

[0026] Figure 8 This is a cross-sectional view of an internal circulation cooling fan according to a second embodiment of the present disclosure.

[0027] Figure 9 yes Figure 8 The longitudinal sectional view at section line 9-9 is shown.

[0028] Figure 10 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the third embodiment of this disclosure.

[0029] Figure 11 This is an exploded perspective view of an internal circulation cooling fan according to a third embodiment of the present disclosure.

[0030] Figure 12 This is a cross-sectional view of an internal circulation cooling fan according to a third embodiment of the present disclosure.

[0031] Figure 13 yes Figure 12 The longitudinal sectional view at section line 13-13 is shown.

[0032] Figure 14 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the fourth embodiment of this disclosure.

[0033] Figure 15 This is an exploded perspective view of an internal circulation cooling fan according to the fourth embodiment of this disclosure.

[0034] Figure 16 This is a cross-sectional view of an internal circulation cooling fan according to the fourth embodiment of this disclosure.

[0035] Figure 17 yes Figure 16 The longitudinal sectional view at section line 17-17 is shown.

[0036] Figure 18 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the fifth embodiment of this disclosure.

[0037] Figure 19 This is an exploded perspective view of an internal circulation cooling fan according to the fifth embodiment of this disclosure.

[0038] Figure 20 This is a cross-sectional view of an internal circulation cooling fan according to the fifth embodiment of this disclosure.

[0039] Figure 21 yes Figure 20 The longitudinal sectional view at section line 21-21 is shown.

[0040] Figure 22 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the sixth embodiment of this disclosure.

[0041] Figure 23 This is an exploded perspective view of an internal circulation cooling fan according to the sixth embodiment of this disclosure.

[0042] Figure 24 This is a cross-sectional view of an internal circulation cooling fan according to the sixth embodiment of this disclosure.

[0043] Figure 25 yes Figure 24 The longitudinal sectional view at section line 25-25 is shown.

[0044] Figure 26 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the seventh embodiment of this disclosure.

[0045] Figure 27 This is an exploded perspective view of an internal circulation cooling fan according to the seventh embodiment of this disclosure.

[0046] Figure 28 This is a cross-sectional view of an internal circulation cooling fan according to the seventh embodiment of this disclosure.

[0047] Figure 29 yes Figure 28 The longitudinal sectional view at section line 29-29 is shown.

[0048] The annotations in the attached figures are explained as follows:

[0049] 100: Base

[0050] 110: Deflector

[0051] 200: Impeller

[0052] 201: Shaft

[0053] 202: Bottom opening

[0054] 203: Side Exit

[0055] 204:Inner flow channel

[0056] 205: Connecting Port

[0057] 210: Wheel hub

[0058] 211: Inner casing

[0059] 212: Outer casing

[0060] 2121:Outer cylinder

[0061] 2122: Top Cover

[0062] 220: Fan blade

[0063] 230: Heat dissipation blades

[0064] 231, 232: Lateral edge

[0065] 240: Rotor magnetic coil

[0066] 300: Coil Group

[0067] 400: Sector frame. Detailed Implementation

[0068] 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, and 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, and therefore should not be construed as a limitation of this disclosure.

[0069] Unless otherwise defined, the terms "substantially" and "approximately" are used to describe and narrate small changes. When combined with an event or situation, the term may include the exact moment the event or situation occurred, or an approximate point in time. For example, when combined with a numerical value, the term may include a range of variation less than or equal to ±10% of the 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%.

[0070] The detailed description and technical content of this disclosure will be explained in conjunction with the accompanying drawings. However, the accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure.

[0071] Figure 1 This is an exploded perspective view of an internal circulation cooling fan according to the first embodiment of this disclosure. Figure 2 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the first embodiment of this disclosure. Figure 3 This is another exploded perspective view of the internal circulation cooling fan according to the first embodiment of this disclosure. (See also...) Figures 1 to 3 The first embodiment of this 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 mounting the aforementioned impeller 200 and stator.

[0072] 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 201. The fan blades 220 are disposed on the outer wall of the hub 210 and arranged radially around the hub 210.

[0073] See Figure 2 and Figure 3Specifically, 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 assembly 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.

[0074] Figure 4 This is a cross-sectional view of an internal circulation cooling fan according to the first embodiment of this disclosure. Figure 5 yes Figure 4 The longitudinal sectional view at section line 5-5 is shown. (See also...) 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 cylindrical body open at both ends. The top cover 2122 is arranged in a ring 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 on the outside of the outer cylinder 2121.

[0075] 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. 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.

[0076] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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 are arranged in a ring around the bottom of the inner cover 211 and centered on the pivot 201.

[0077] See Figure 5 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 inside the inner casing 211 into the airflow 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 then 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.

[0078] Figure 6 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to a second embodiment of the present disclosure. Figure 7 This is an exploded perspective view of an internal circulation cooling fan according to a second embodiment of this disclosure. (See attached diagram.) Figure 6 and Figure 7 The second embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and stator.

[0079] 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.

[0080] 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.

[0081] Figure 8 This is a cross-sectional view of an internal circulation cooling fan according to a second embodiment of the present disclosure. Figure 9 yes Figure 8 The longitudinal sectional view at section line 9-9 is shown. (See also...) 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 cylindrical body open at both ends. The top cover 2122 is arranged in a ring 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 on the outside of the outer cylinder 2121.

[0082] The inner flow channel 204 is defined between the top cover 2122 and the inner casing 211. In this embodiment, one side of the inner flow channel 204 communicates with the internal space of the inner casing 211, and the other side of the inner flow channel 204 communicates with the outside of the outer casing 212. Specifically, the top of the inner casing 211 has a connecting opening 205 to connect the internal space of the inner casing 211 to the inner flow channel 204, and the side of the outer casing 212 has 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.

[0083] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0084] 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0085] See Figure 9 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 inside the inner casing 211 into the airflow 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 then 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.

[0086] Figure 10 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the third embodiment of this disclosure. Figure 11 This is an exploded perspective view of an internal circulation cooling fan according to a third embodiment of this disclosure. (See attached diagram.) Figure 10 and Figure 11 The third embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and stator.

[0087] 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.

[0088] 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.

[0089] Figure 12 This is a cross-sectional view of an internal circulation cooling fan according to a third embodiment of the present disclosure. Figure 13 yes Figure 12The longitudinal sectional view at section line 13-13 is shown. (See also...) 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 cylindrical body open at both ends. The top cover 2122 is arranged in a ring 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 on the outside of the outer cylinder 2121.

[0090] 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 the side of the outer shell 212 forms a side outlet 203 communicating with 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 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.

[0091] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0092] 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0093] See Figure 13When 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 inside the inner casing 211 into the airflow 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 then 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.

[0094] Figure 14 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the fourth embodiment of this disclosure. Figure 15 This is an exploded perspective view of an internal circulation cooling fan according to the fourth embodiment of this disclosure. (See attached diagram) Figure 14 and Figure 15 The fourth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and stator.

[0095] 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.

[0096] 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.

[0097] Figure 16 This is a cross-sectional view of an internal circulation cooling fan according to the fourth embodiment of this disclosure. Figure 17 yes Figure 16 The longitudinal sectional view at section line 17-17 is shown. (See also...) 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 cylindrical body open at both ends. The top cover 2122 is configured in a disc 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 on the outside of the outer cylinder 2121.

[0098] 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. 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.

[0099] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 232 of the heat dissipation blade 230 abuts against the top cover 2122.

[0100] 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 surrounding 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0101] See Figure 17 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 inside the inner casing 211 into the airflow 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 then 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.

[0102] Figure 18 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the fifth embodiment of this disclosure. Figure 19 This is an exploded perspective view of an internal circulation cooling fan according to the fifth embodiment of this disclosure. (See attached diagram.) Figure 18 and Figure 19The fifth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and stator.

[0103] 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.

[0104] 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.

[0105] Figure 20 This is a cross-sectional view of an internal circulation cooling fan according to the fifth embodiment of this disclosure. Figure 21 yes Figure 20 The longitudinal sectional view at section line 21-21 is shown. (See also...) 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 cylindrical body open at both ends. The top cover 2122 is configured in a disc 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 on the outside of the outer cylinder 2121.

[0106] 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. 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.

[0107] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0108] 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0109] See 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 inside the inner casing 211 into the airflow 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 then 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.

[0110] Figure 22 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the sixth embodiment of this disclosure. Figure 23 This is an exploded perspective view of an internal circulation cooling fan according to the sixth embodiment of this disclosure. (See attached diagram) Figure 22 and Figure 23 The sixth embodiment of this disclosure provides an internal circulation cooling fan, which includes at least an impeller 200 and a stator. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and stator.

[0111] 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.

[0112] 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, with a rotor magnetic ring 240 provided on the inner wall of the inner cover 211. The inner cover 211 and the outer cover 212 are spaced apart, forming an inner flow channel 204 between them.

[0113] Figure 24 This is a cross-sectional view of an internal circulation cooling fan according to the sixth embodiment of this disclosure. Figure 25 yes Figure 24 The longitudinal sectional view at section line 25-25 is shown. (See also...) Figures 23 to 25 In this embodiment, the fan blades 220 are disposed on the outside of the outer casing 212.

[0114] In this embodiment, one side of the inner flow channel 204 connects to the internal space of the inner casing 211, and the other side of the inner flow channel 204 connects to the outside of the outer casing 212. Specifically, the top of the inner casing 211 has a plurality of connecting openings 205 to connect the internal space of the inner casing 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 casing 212 and the bottom edge of the inner casing 211. In this embodiment, the bottom opening 202 is annular.

[0115] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0116] 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0117] See Figure 21When 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 inside the inner casing 211 into the airflow 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 then 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.

[0118] Figure 26 This is a three-dimensional schematic diagram of an internal circulation cooling fan according to the seventh embodiment of this disclosure. Figure 27 This is an exploded perspective view of an internal circulation cooling fan according to the seventh embodiment of this disclosure. (See attached diagram) Figure 26 and Figure 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. Furthermore, the internal circulation cooling fan of this disclosure may also include components as in the first embodiment. Figure 1 The frame 400 shown is provided for mounting the aforementioned impeller 200 and coil assembly 300.

[0119] 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.

[0120] 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.

[0121] Figure 28 This is a cross-sectional view of an internal circulation cooling fan according to the seventh embodiment of this disclosure. Figure 29 yes Figure 28 The longitudinal sectional view at section line 29-29 is shown. (See also...) Figures 27 to 29 In this embodiment, the fan blades 220 are disposed on the outside of the outer casing 212.

[0122] In this embodiment, one side of the inner flow channel 204 connects to the internal space of the inner casing 211, and the other side of the inner flow channel 204 connects to the outside of the outer casing 212. Specifically, the top of the inner casing 211 has a connecting opening 205 to connect the internal space of the inner casing 211 to the inner flow channel 204. A bottom opening 202 connecting the inner flow channel 204 is formed between the bottom edge of the outer casing 212 and the bottom edge of the inner casing 211. In this embodiment, the bottom opening 202 is annular.

[0123] A plurality of heat dissipation blades 230 are arranged in a ring within the inner flow channel 204. Each heat dissipation blade 230 has two opposing side edges 231 and 232, which are respectively connected to the inner cover 211 and the outer cover 212. The connection can be either abutting or integrally formed. In this embodiment, the 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, while the other side edge 231 of the heat dissipation blade 230 abuts against the inner cover 211.

[0124] 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 surrounding 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 are arranged in a ring around the bottom end of the inner casing 211 and centered on the rotating shaft 201.

[0125] See 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 inside the inner casing 211 into the airflow 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 then 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.

[0126] The above description is merely a preferred embodiment of this invention and is not intended to limit the patent scope of this invention. Other equivalent variations that utilize the patent spirit of this invention should also fall within the patent scope of this invention.

Claims

1. An internal circulation cooling fan, comprising: A stator contains a coil group; and An impeller includes a hub and a plurality of blades arranged around the hub. The hub has an inner casing and an outer casing nested inside the inner casing. The coil assembly is housed within the inner casing. An inner flow channel is formed between the inner casing and the outer casing. One side of the inner 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 heat dissipation blades are disposed within the inner flow channel. The plurality of 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.

2. The internal circulation cooling fan as claimed in claim 1, wherein a plurality of the cooling blades are disposed on the outer side of the inner casing.

3. The internal circulation cooling fan as described in claim 1, wherein a plurality of the cooling blades are disposed on the inner side of the outer casing.

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

5. The internal circulation cooling fan as described in claim 4, wherein a plurality of the fan blades are disposed on the outer side of the outer cylinder.

6. The internal circulation cooling fan as described in claim 4, wherein a plurality of the cooling blades are disposed on the top cover.

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

10. The internal circulation cooling fan as claimed 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 claimed 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 claimed in claim 1, wherein the stator includes a base, the coil assembly is fixed to the base, and the hub is pivotally mounted on the base.

13. The internal circulation cooling fan as claimed in claim 1, wherein the opposite side edge of each of the cooling blades abuts against another of the inner casing or the outer casing.

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