US20110127017A1 - Heat dissipation device and fan module thereof - Google Patents
Heat dissipation device and fan module thereof Download PDFInfo
- Publication number
- US20110127017A1 US20110127017A1 US12/641,209 US64120909A US2011127017A1 US 20110127017 A1 US20110127017 A1 US 20110127017A1 US 64120909 A US64120909 A US 64120909A US 2011127017 A1 US2011127017 A1 US 2011127017A1
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- US
- United States
- Prior art keywords
- fan
- assist
- hub
- rotor
- main
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000017525 heat dissipation Effects 0.000 title claims description 25
- 239000000758 substrate Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000013021 overheating Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
- F04D25/0613—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump the electric motor being of the inside-out type, i.e. the rotor is arranged radially outside a central stator
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/04—Units comprising pumps and their driving means the pump being fluid-driven
- F04D25/045—Units comprising pumps and their driving means the pump being fluid-driven the pump wheel carrying the fluid driving means, e.g. turbine blades
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
- F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
Definitions
- the disclosure generally relates to heat dissipation, and particularly to a heat dissipation device having an improved fan module.
- a typical heat dissipation device includes a heat sink and a cooling fan arranged on the heat sink.
- Electronic components are usually attached to a central portion of the heat sink, the location at which heat generated by the electronic component is primarily concentrated.
- the cooling fan includes an impeller.
- the impeller includes a hub and a plurality of blades around the hub. During operation of the cooling fan, the impeller rotates and produces airflow towards the heat sink. However, due to blocked access to the hub of the impeller, only a small portion of the airflow reaches the central portion of the heat sink immediately under the hub, such that heat concentrated at the central portion of the heat sink cannot be efficiently dissipated.
- FIG. 1 is a cross sectional, schematic view of a heat dissipation device in accordance with a first embodiment of the disclosure.
- FIG. 2 is an enlarged view of a fan module of the heat dissipation device of FIG. 1 .
- FIG. 3 is a cross sectional, schematic view of a fan module of a heat dissipation device in accordance with a second embodiment of the disclosure.
- the heat dissipation device is mounted on an electronic component 10 , such as a central processing unit (CPU), for dissipating heat therefrom.
- the heat dissipation device includes a heat sink 20 and a fan module 30 arranged on the heat sink 20 .
- the heat sink 20 includes a substrate 21 and a plurality of fins 23 extending perpendicularly up from the substrate 21 .
- the substrate 21 is attached to the electronic component 10 at a central portion of a bottom surface thereof.
- the fins 23 are parallel to and spaced from each other.
- An air channel 231 is defined between every two adjacent fins 23 .
- the fins 23 includes a plurality of inner fins 234 at a central portion of the heat sink 10 , and a plurality of outer fins 236 around the inner fins 234 .
- the inner fins 234 each have a length less than that of the outer fins 236 , and therefore a recess 232 is defined in the central portion of the heat sink 20 over the inner fins 234 .
- the fan module 30 includes a main fan 31 and an assist fan 33 located below the main fan 31 .
- the main and assist fans 31 , 33 are axial fans.
- the main fan 31 includes a frame 311 , a bearing system 313 , a stator 315 mounted on the frame 311 , and a rotor 317 covering the stator 315 .
- the frame 311 is mounted on the outer fins 236 of the heat sink 20 .
- the frame 311 is substantially rectangular and hollow.
- the frame 311 defines an air inlet 3111 at a top end thereof, and an air outlet 3112 at a bottom end thereof.
- a base 3113 is formed at a central portion of the bottom end of the frame 311 .
- the base 3113 is connected to the frame 311 via a plurality of ribs (not labeled).
- the air outlet 3112 is defined between the ribs.
- a central tube 3114 extends perpendicularly up from a central portion of the base 3113 .
- the bearing system 313 is received in the central tube 3114 of the frame 311 .
- the bearing system 313 includes a sleeve 3131 and a locking ring 3132 located below the sleeve 3131 .
- the sleeve 3131 is hollow and cylindrical, and the locking ring 3132 is annular.
- the stator 315 includes a circuit board 3151 and a coil assembly 3152 located on the circuit board 3151 .
- the circuit board 3151 and the coil assembly 3152 are mounted around the central tube 3114 of the frame 311 .
- the rotor 317 is rotatably mounted around the coil assembly 3152 of the stator 315 .
- the rotor 317 includes a hub 3171 , a shaft 3172 , a plurality of blades 3173 , and a magnet 3174 .
- the hub 3171 is semi-enclosed, and includes a top wall 3175 and a sidewall 3176 extending perpendicularly down from an outer periphery of the bottom wall 3175 .
- a top end of the shaft 3172 is fixed at a central portion of the top wall 3175 of the hub 3171 .
- a middle portion of the shaft 3172 is received in the sleeve 3131 .
- a bottom end of the shaft 3172 defines an annular notch 3177 engaged with the locking ring 3132 to limit floating of the rotor 317 .
- the rotor 317 with the shaft 3172 is rotatable with respect to the bearing system 313 .
- the blades 3173 extend radially out from an outer circumferential surface of the sidewall 3176 of the hub 3171 .
- the magnet 3174 is annular, and contacted with an inner circumferential surface of the sidewall 3176 of the hub 3171 .
- the assist fan 33 is located under the hub 3171 of the main fan 31 , and received in the recess 232 of the heat sink 20 .
- the assist fan 33 has an outer diameter less than that of the main fan 31 .
- the assist fan 33 includes a frame 331 , a bearing system 333 , and a rotor 337 .
- the frame 331 of the assist fan 33 is mounted on the inner fins 234 of the heat sink 20 .
- the frame 331 has an outer diameter less than that of the frame 311 of the main fan 31 , and slightly larger than an outer diameter of the sidewall 3176 of the hub 3171 of the main fan 31 .
- the frame 331 is also substantially rectangular and hollow.
- the frame 331 defines an air inlet 3311 at a top end thereof, and an air outlet 3312 at a bottom end thereof.
- a base 3313 is formed at a central portion of the bottom end of the frame 331 .
- the base 3313 is connected to the frame 331 via a plurality of ribs (not labeled).
- the air outlet 3312 is defined between the ribs.
- a central tube 3314 extends perpendicularly up from a central portion of the base 3313 .
- the bearing system 333 is the same as the bearing system 313 of the main fan 31 except in dimensions.
- the bearing system 333 also includes a sleeve 3331 and a locking ring 3332 located below the sleeve 3331 .
- the rotor 337 is rotatably mounted around the central tube 3314 of the frame 331 .
- the rotor 337 includes a hub 3371 , a shaft 3372 , and a plurality of blades 3373 .
- the hub 3371 has an outer diameter much less than that of the hub 3171 of the main fan 31 .
- the hub 3371 also includes a top wall 3375 and a sidewall 3376 extending perpendicularly down from an outer periphery of the top wall 3375 .
- a top end of the shaft 3372 is fixed to a central portion of the top wall 3375 of the hub 3371 .
- a middle portion of the shaft 3372 is received in the sleeve 3331 .
- a bottom end of the shaft 3372 defines an annular notch 3377 engaged with the locking ring 3332 to limit floating of the rotor 337 .
- the rotor 337 with the shaft 3372 is rotatable with respect to the bearing system 333 .
- the blades 3373 extend radially out from an outer circumferential surface of the sidewall 3376 of the hub 3371 . Inner sides of the blades 3373 of the assist fan 33 adjacent to the hub 3371 are located within a range of a radius of the hub 3171 of the main fan 31 along a radial direction of the rotor 317 of the main fan 31 .
- Outer sides of the blades 3373 of the assist fan 33 away from the hub 3371 are located beyond the hub 3171 of the main fan 31 along the radial direction of the rotor 317 of the main fan 31 . This ensures that airflow from the main fan 31 is capable to flow towards outer portions of the blades 3373 of the assist fan 33 beyond the hub 3171 of the main fan 31 , and therefore pushes the rotor 337 of the assist fan 33 to rotate.
- the rotor 317 of the main fan 31 of the fan module 30 rotates and thus produces airflow.
- a portion of the airflow from the main fan 31 flows towards the outer fins 236 of the heat sink 20 via the air outlet 3112 of the main fan 31 , and then enters corresponding air passages 231 between the outer fins 236 , thereby taking heat away.
- Another portion of the airflow from the main fan 31 flows towards the blades 3373 of the assist fan 33 via the air outlet 3112 of the main fan 31 and the air inlet 3311 of the assist fan 33 , and therefore pushes the rotor 337 of the assist fan 33 to rotate to produce airflow.
- the airflow from the assist fan 33 flows towards the inner fins 234 of heat sink 20 via the air outlet 3312 of the assist fan 33 , and then enters corresponding air passages 231 between the inner fins 234 of heat sink 20 , thereby taking away the heat concentrated at the central portion of the heat sink 20 .
- the assist fan 33 is located below the hub 3171 of the rotor 317 of the assist fan 31 .
- the inner sides of the blades 3373 adjacent to the hub 3371 of the assist fan 33 are located within the range of the radius of the hub 3171 of the main fan 31 along the radial direction of the rotor 317 of the main fan 31 .
- Outer sides of the blades 3373 away from the hub 3371 of the assist fan 33 are located beyond the hub 3171 of the main fan 31 along the radial direction of the rotor 317 of the main fan 31 .
- the blades 3373 of the rotor 337 of the assist fan 33 are pushed to rotate by the airflow from the main fan 31 , and therefore produce airflow towards the central portion of the heat sink 20 .
- heat concentrated at the central portion of the heat sink 20 can be efficiently dissipated by the assist fan 33 .
- the blades 3373 of the rotor 337 of the assist fan 33 are pushed to rotate by the airflow from the main fan 31 . Therefore, a stator and a magnet are not required in the assist fan 33 .
- the hub 3371 of the assist fan 33 is reasonably smaller than the hub 3171 of the main fan 31 , and a blocked access to the hub 3371 of the assist fan 33 is relatively smaller.
- an airflow dead area under the hub 3171 of the main fan 31 is reduced, and the heat dissipation efficiency of the heat dissipation device is improved.
- a fan module 30 a of a heat dissipation device in accordance with a second embodiment is shown.
- the fan module 30 a of the second embodiment differs from the fan module 30 of the first embodiment only in the assist fan.
- a bearing system 333 a of the assist fan 33 a is received in a hub 3371 a of a rotor 337 a of the assist fan 33 a , with a sleeve 3331 a of the bearing system 333 a of the assist fan 33 a fixed to an inner circumferential surface of the hub 3371 a of the rotor 337 a of the assist fan 33 a .
- a shaft 3372 a of the assist fan 33 a is coaxial to the shaft 3172 of the main fan 31 .
- a top end of the shaft 3372 a of the assist fan 33 a is fixed at a central portion of a bottom surface of the base 3113 of the main fan 31 .
- a middle portion of the shaft 3372 a is received in the sleeve 3331 a of the bearing system 333 a .
- a bottom end of the shaft 3372 a defines an annular notch 3377 a engaged with a locking ring 3132 a of the bearing system 333 a , and thus the hub 3371 a of the assist fan 33 a is rotatable with respect to the shaft 3372 a .
- a portion of the airflow form the main fan 31 flows towards the blades 3373 a of the assist fan 33 a , and pushes the rotor 337 a and the bearing system 333 a of the assist fan 33 a to rotate around the shaft 3372 a , thereby producing airflow towards the central portion of the heat sink 20 .
- the frame is omitted, and thus, a size of the hub 3371 a of the assist fan 33 a in this embodiment can be further reduced relative to the first embodiment, and therefore a blocked access to the hub 3371 a of the assist fan 33 a is relatively smaller.
- the airflow dead area under the hub 3171 of the main fan 31 is reduced, and the heat dissipation efficiency of the heat dissipation device is further improved.
Abstract
An exemplary fan module includes a main fan and an assist fan. The main and assist fans each include a rotor which includes a hub and a plurality of blades around the hub. The assist fan is located below the hub of the main fan. Inner sides of the blades of the assist fan adjacent to the hub of the assist fan are located within a range of a radius of the hub of the main fan along a radial direction of the rotor of the main fan. Outer sides of the blades of the assist fan away from the hub of the assist fan are located beyond the hub of the main fan along the radial direction of the rotor of the main fan. The blades of the assist fan are pushed to rotate by airflow from the main fan to produce airflow towards a heat sink.
Description
- This application is related to a co-pending application entitled “FAN MODULE AND HEAT DISSIPATION DEVICE INCORPORATING THE SAME” (attorney docket number US 30707), assigned to the same assignee of this application and filed on the same date.
- 1. Technical Field
- The disclosure generally relates to heat dissipation, and particularly to a heat dissipation device having an improved fan module.
- 2. Description of Related Art
- A typical heat dissipation device includes a heat sink and a cooling fan arranged on the heat sink. Electronic components are usually attached to a central portion of the heat sink, the location at which heat generated by the electronic component is primarily concentrated. The cooling fan includes an impeller. The impeller includes a hub and a plurality of blades around the hub. During operation of the cooling fan, the impeller rotates and produces airflow towards the heat sink. However, due to blocked access to the hub of the impeller, only a small portion of the airflow reaches the central portion of the heat sink immediately under the hub, such that heat concentrated at the central portion of the heat sink cannot be efficiently dissipated.
- What is needed, therefore, is a heat dissipation device and a fan module of the heat dissipation device which can overcome the described limitations.
- Many aspects of the present embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.
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FIG. 1 is a cross sectional, schematic view of a heat dissipation device in accordance with a first embodiment of the disclosure. -
FIG. 2 is an enlarged view of a fan module of the heat dissipation device ofFIG. 1 . -
FIG. 3 is a cross sectional, schematic view of a fan module of a heat dissipation device in accordance with a second embodiment of the disclosure. - Referring to
FIG. 1 , a heat dissipation device in accordance with a first embodiment is shown. The heat dissipation device is mounted on anelectronic component 10, such as a central processing unit (CPU), for dissipating heat therefrom. The heat dissipation device includes aheat sink 20 and afan module 30 arranged on theheat sink 20. - The
heat sink 20 includes asubstrate 21 and a plurality offins 23 extending perpendicularly up from thesubstrate 21. Thesubstrate 21 is attached to theelectronic component 10 at a central portion of a bottom surface thereof. Thefins 23 are parallel to and spaced from each other. Anair channel 231 is defined between every twoadjacent fins 23. Thefins 23 includes a plurality ofinner fins 234 at a central portion of theheat sink 10, and a plurality ofouter fins 236 around theinner fins 234. Theinner fins 234 each have a length less than that of theouter fins 236, and therefore arecess 232 is defined in the central portion of theheat sink 20 over theinner fins 234. - The
fan module 30 includes amain fan 31 and anassist fan 33 located below themain fan 31. The main and assistfans - Referring to
FIG. 2 , themain fan 31 includes aframe 311, abearing system 313, astator 315 mounted on theframe 311, and arotor 317 covering thestator 315. - The
frame 311 is mounted on theouter fins 236 of theheat sink 20. Theframe 311 is substantially rectangular and hollow. Theframe 311 defines anair inlet 3111 at a top end thereof, and anair outlet 3112 at a bottom end thereof. Abase 3113 is formed at a central portion of the bottom end of theframe 311. Thebase 3113 is connected to theframe 311 via a plurality of ribs (not labeled). Theair outlet 3112 is defined between the ribs. Acentral tube 3114 extends perpendicularly up from a central portion of thebase 3113. - The
bearing system 313 is received in thecentral tube 3114 of theframe 311. Thebearing system 313 includes asleeve 3131 and alocking ring 3132 located below thesleeve 3131. Thesleeve 3131 is hollow and cylindrical, and thelocking ring 3132 is annular. - The
stator 315 includes acircuit board 3151 and acoil assembly 3152 located on thecircuit board 3151. Thecircuit board 3151 and thecoil assembly 3152 are mounted around thecentral tube 3114 of theframe 311. - The
rotor 317 is rotatably mounted around thecoil assembly 3152 of thestator 315. Therotor 317 includes ahub 3171, ashaft 3172, a plurality ofblades 3173, and amagnet 3174. Thehub 3171 is semi-enclosed, and includes atop wall 3175 and asidewall 3176 extending perpendicularly down from an outer periphery of thebottom wall 3175. A top end of theshaft 3172 is fixed at a central portion of thetop wall 3175 of thehub 3171. A middle portion of theshaft 3172 is received in thesleeve 3131. A bottom end of theshaft 3172 defines anannular notch 3177 engaged with thelocking ring 3132 to limit floating of therotor 317. Therotor 317 with theshaft 3172 is rotatable with respect to thebearing system 313. Theblades 3173 extend radially out from an outer circumferential surface of thesidewall 3176 of thehub 3171. Themagnet 3174 is annular, and contacted with an inner circumferential surface of thesidewall 3176 of thehub 3171. - The
assist fan 33 is located under thehub 3171 of themain fan 31, and received in therecess 232 of theheat sink 20. Theassist fan 33 has an outer diameter less than that of themain fan 31. Theassist fan 33 includes aframe 331, abearing system 333, and arotor 337. - The
frame 331 of theassist fan 33 is mounted on theinner fins 234 of theheat sink 20. Theframe 331 has an outer diameter less than that of theframe 311 of themain fan 31, and slightly larger than an outer diameter of thesidewall 3176 of thehub 3171 of themain fan 31. Theframe 331 is also substantially rectangular and hollow. Theframe 331 defines anair inlet 3311 at a top end thereof, and anair outlet 3312 at a bottom end thereof. Abase 3313 is formed at a central portion of the bottom end of theframe 331. Thebase 3313 is connected to theframe 331 via a plurality of ribs (not labeled). Theair outlet 3312 is defined between the ribs. Acentral tube 3314 extends perpendicularly up from a central portion of thebase 3313. - The
bearing system 333 is the same as thebearing system 313 of themain fan 31 except in dimensions. Thebearing system 333 also includes asleeve 3331 and alocking ring 3332 located below thesleeve 3331. - The
rotor 337 is rotatably mounted around thecentral tube 3314 of theframe 331. Therotor 337 includes ahub 3371, ashaft 3372, and a plurality ofblades 3373. Thehub 3371 has an outer diameter much less than that of thehub 3171 of themain fan 31. Thehub 3371 also includes atop wall 3375 and asidewall 3376 extending perpendicularly down from an outer periphery of thetop wall 3375. A top end of theshaft 3372 is fixed to a central portion of thetop wall 3375 of thehub 3371. A middle portion of theshaft 3372 is received in thesleeve 3331. A bottom end of theshaft 3372 defines anannular notch 3377 engaged with thelocking ring 3332 to limit floating of therotor 337. Therotor 337 with theshaft 3372 is rotatable with respect to thebearing system 333. Theblades 3373 extend radially out from an outer circumferential surface of thesidewall 3376 of thehub 3371. Inner sides of theblades 3373 of theassist fan 33 adjacent to thehub 3371 are located within a range of a radius of thehub 3171 of themain fan 31 along a radial direction of therotor 317 of themain fan 31. Outer sides of theblades 3373 of theassist fan 33 away from thehub 3371 are located beyond thehub 3171 of themain fan 31 along the radial direction of therotor 317 of themain fan 31. This ensures that airflow from themain fan 31 is capable to flow towards outer portions of theblades 3373 of theassist fan 33 beyond thehub 3171 of themain fan 31, and therefore pushes therotor 337 of theassist fan 33 to rotate. - During operation, the
rotor 317 of themain fan 31 of thefan module 30 rotates and thus produces airflow. A portion of the airflow from themain fan 31 flows towards theouter fins 236 of theheat sink 20 via theair outlet 3112 of themain fan 31, and then enters correspondingair passages 231 between theouter fins 236, thereby taking heat away. Another portion of the airflow from themain fan 31 flows towards theblades 3373 of theassist fan 33 via theair outlet 3112 of themain fan 31 and theair inlet 3311 of theassist fan 33, and therefore pushes therotor 337 of theassist fan 33 to rotate to produce airflow. The airflow from theassist fan 33 flows towards theinner fins 234 ofheat sink 20 via theair outlet 3312 of theassist fan 33, and then enters correspondingair passages 231 between theinner fins 234 ofheat sink 20, thereby taking away the heat concentrated at the central portion of theheat sink 20. - In the present heat dissipation device, the assist
fan 33 is located below thehub 3171 of therotor 317 of theassist fan 31. The inner sides of theblades 3373 adjacent to thehub 3371 of theassist fan 33 are located within the range of the radius of thehub 3171 of themain fan 31 along the radial direction of therotor 317 of themain fan 31. Outer sides of theblades 3373 away from thehub 3371 of theassist fan 33 are located beyond thehub 3171 of themain fan 31 along the radial direction of therotor 317 of themain fan 31. Theblades 3373 of therotor 337 of theassist fan 33 are pushed to rotate by the airflow from themain fan 31, and therefore produce airflow towards the central portion of theheat sink 20. Thus, heat concentrated at the central portion of theheat sink 20 can be efficiently dissipated by theassist fan 33. This prevents theelectronic component 10 at the central portion of thesubstrate 21 of theheat sink 20 from overheating. In addition, theblades 3373 of therotor 337 of theassist fan 33 are pushed to rotate by the airflow from themain fan 31. Therefore, a stator and a magnet are not required in theassist fan 33. Thehub 3371 of theassist fan 33 is reasonably smaller than thehub 3171 of themain fan 31, and a blocked access to thehub 3371 of theassist fan 33 is relatively smaller. Thus, an airflow dead area under thehub 3171 of themain fan 31 is reduced, and the heat dissipation efficiency of the heat dissipation device is improved. - Referring to
FIG. 3 , afan module 30 a of a heat dissipation device in accordance with a second embodiment is shown. Thefan module 30 a of the second embodiment differs from thefan module 30 of the first embodiment only in the assist fan. - In this embodiment, there is no frame in an
assist fan 33 a of thefan module 30 a. Abearing system 333 a of theassist fan 33 a is received in ahub 3371 a of arotor 337 a of theassist fan 33 a, with asleeve 3331 a of thebearing system 333 a of theassist fan 33 a fixed to an inner circumferential surface of thehub 3371 a of therotor 337 a of theassist fan 33 a. Ashaft 3372 a of theassist fan 33 a is coaxial to theshaft 3172 of themain fan 31. A top end of theshaft 3372 a of theassist fan 33 a is fixed at a central portion of a bottom surface of thebase 3113 of themain fan 31. A middle portion of theshaft 3372 a is received in thesleeve 3331 a of thebearing system 333 a. A bottom end of theshaft 3372 a defines anannular notch 3377 a engaged with a locking ring 3132 a of thebearing system 333 a, and thus thehub 3371 a of theassist fan 33 a is rotatable with respect to theshaft 3372 a. During operation, a portion of the airflow form themain fan 31 flows towards theblades 3373 a of theassist fan 33 a, and pushes therotor 337 a and thebearing system 333 a of theassist fan 33 a to rotate around theshaft 3372 a, thereby producing airflow towards the central portion of theheat sink 20. - In the
present fan module 30 a, the frame is omitted, and thus, a size of thehub 3371 a of theassist fan 33 a in this embodiment can be further reduced relative to the first embodiment, and therefore a blocked access to thehub 3371 a of theassist fan 33 a is relatively smaller. Thus, the airflow dead area under thehub 3171 of themain fan 31 is reduced, and the heat dissipation efficiency of the heat dissipation device is further improved. - It is to be understood, however, that even though numerous characteristics and advantages of the present embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.
Claims (18)
1. A fan module, comprising:
a main fan comprising a rotor, the rotor of the main fan comprising a hub and a plurality of blades around the hub; and
an assist fan located below the hub of the main fan, the assist fan comprising a rotor, the rotor of the assist fan comprising a hub and a plurality of blades around the hub, inner sides of the blades of the assist fan adjacent to the hub of the assist fan being located within a range of a radius of the hub of the main fan along a radial direction of the rotor of the main fan, outer sides of the blades of the assist fan away from the hub of the assist fan being located beyond the hub of the main fan along the radial direction of the rotor of the main fan, the blades of the assist fan pushed to rotate by airflow from the main fan to produce airflow.
2. The fan module of claim 1 , wherein the assist fan further comprises a bearing system and a shaft, the bearing system of the assist fan fixed in the hub of the rotor of the assist fan, a top end of the shaft of the assist fan fixed on the main fan, the rotor and the bearing system of the assist fan being rotatable with respect to the shaft of the assist fan.
3. The fan module of claim 2 , wherein the main fan further comprises a base supporting the rotor of the main fan, the top end of the shaft of the assist fan fixed on the base of the main fan.
4. The fan module of claim 2 , wherein the bearing system of the assist fan comprises a sleeve and a locking ring located below the sleeve, the sleeve fixed on an inner circumferential surface of the hub of the rotor of the assist fan, a middle portion of the shaft of the assist fan received in the sleeve, a bottom end of the shaft of the assist fan defining a notch engaged with the locking ring of the bearing system of the assist fan.
5. The fan module of claim 1 , wherein the assist fan further comprises a base and a bearing system, a central tube extending upwardly from the base of the assist fan, the bearing system of the assistant fan received in the central tube of the assistant fan, the rotor of the assist fan further comprising a shaft with a top end fixed on the hub of the rotor of the assist fan, and a bottom end rotatably mounted in the bearing system.
6. The fan module of claim 5 , wherein the hub of the rotor of the assist fan is disposed around the central tube.
7. The fan module of claim 5 , wherein the bearing system of the assist fan comprises a sleeve and a locking ring located below the sleeve, a middle portion of the shaft of the assist fan received in the sleeve, a bottom end of the shaft of the assist fan defining a notch engaged with the locking ring of the bearing system of the assist fan.
8. The fan module of claim 1 , wherein the main fan defines an air outlet at a bottom end thereof, airflow from the main fan flowing towards the blades of the rotor of the assist fan via the air outlet of the main fan.
9. The fan module of claim 1 , wherein the assist fan has an outer diameter less than that of the main fan.
10. A heat dissipation device, comprising:
a heat sink; and
a fan module arranged on the heat sink, the fan module comprising:
a main fan comprising a rotor, the rotor of the main fan comprising a hub and a plurality of blades around the hub; and
an assist fan located below the hub of the main fan, the assist fan comprising a rotor, the rotor of the assist fan comprising a hub and a plurality of blades around the hub, inner sides of the blades of the assist fan adjacent to the hub of the assist fan being located within a range of a radius of the hub of the main fan along a radial direction of the rotor of the main fan, outer sides of the blades of the assist fan away from the hub of the assist fan being located beyond the hub of the main fan along the radial direction of the rotor of the main fan, the blades of the assist fan pushed to rotate by airflow from the main fan to produce airflow.
11. The heat dissipation device of claim 10 , wherein the heat sink defines a recess in a central portion thereof, the assist fan of the fan module received in the recess.
12. The heat dissipation device of claim 10 , wherein the assist fan further comprises a bearing system and a shaft, the bearing system of the assist fan fixed in the hub of the rotor of the assist fan, a top end of the shaft of the assist fan fixed on the main fan, the rotor and the bearing system of the assist fan being rotatable with respect to the shaft of the assist fan.
13. The heat dissipation device of claim 12 , wherein the main fan further comprises a base supporting the rotor of the main fan, the top end of the shaft of the assist fan fixed on the base of the main fan.
14. The heat dissipation device of claim 12 , wherein the bearing system of the assist fan comprises a sleeve and a locking ring located below the sleeve, the sleeve fixed on an inner circumferential surface of the hub of the rotor of the assist fan, a middle portion of the shaft of the assist fan received in the sleeve, a bottom end of the shaft of the assist fan defining a notch engaged with the locking ring of the bearing system of the assist fan.
15. The heat dissipation device of claim 10 , wherein the assist fan further comprises a base and a bearing system, a central tube extending upwardly from the base of the assist fan, the bearing system of the assistant fan received in the central tube of the assistant fan, the rotor of the assist fan further comprising a shaft with a top end fixed on the hub of the rotor of the assist fan, and a bottom end rotatably mounted in the bearing system.
16. The fan module of claim 15 , wherein the hub of the rotor of the assist fan is disposed around the central tube.
17. The fan module of claim 15 , wherein the bearing system of the assist fan comprises a sleeve and a locking ring located below the sleeve, a middle portion of the shaft of the assist fan received in the sleeve, a bottom end of the shaft of the assist fan defining a notch engaged with the locking ring of the bearing system of the assist fan.
18. The fan module of claim 10 , wherein the assist fan has an outer diameter less than that of the main fan.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW098141252A TW201120319A (en) | 2009-12-02 | 2009-12-02 | Fan module and heat disspation device incorporating the same |
TW98141252 | 2009-12-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20110127017A1 true US20110127017A1 (en) | 2011-06-02 |
Family
ID=44067958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/641,209 Abandoned US20110127017A1 (en) | 2009-12-02 | 2009-12-17 | Heat dissipation device and fan module thereof |
Country Status (2)
Country | Link |
---|---|
US (1) | US20110127017A1 (en) |
TW (1) | TW201120319A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160076547A1 (en) * | 2014-09-15 | 2016-03-17 | Speedtech Energy Co.,Ltd. | Solar fan |
EP3156875A1 (en) * | 2015-10-16 | 2017-04-19 | Giga-Byte Technology Co., Ltd. | Heat dissipation module, display card assembly and electronic device |
CN112012948A (en) * | 2019-05-31 | 2020-12-01 | 台达电子工业股份有限公司 | Counter-rotating fan structure |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6367542B1 (en) * | 2001-03-27 | 2002-04-09 | Foxconn Precision Components Co., Ltd. | Heat sink assembly with dual fans |
US6533559B2 (en) * | 2001-05-11 | 2003-03-18 | Hsieh Hsin-Mao | Heat dissipating fan with multiple layers of blades |
US6648065B2 (en) * | 2001-05-18 | 2003-11-18 | Delta Electronics, Inc. | Heat-dissipating module |
US20080124232A1 (en) * | 2006-11-23 | 2008-05-29 | Delta Electronics, Inc. | Serial fan assembly and connection structure thereof |
-
2009
- 2009-12-02 TW TW098141252A patent/TW201120319A/en unknown
- 2009-12-17 US US12/641,209 patent/US20110127017A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6367542B1 (en) * | 2001-03-27 | 2002-04-09 | Foxconn Precision Components Co., Ltd. | Heat sink assembly with dual fans |
US6533559B2 (en) * | 2001-05-11 | 2003-03-18 | Hsieh Hsin-Mao | Heat dissipating fan with multiple layers of blades |
US6648065B2 (en) * | 2001-05-18 | 2003-11-18 | Delta Electronics, Inc. | Heat-dissipating module |
US20080124232A1 (en) * | 2006-11-23 | 2008-05-29 | Delta Electronics, Inc. | Serial fan assembly and connection structure thereof |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160076547A1 (en) * | 2014-09-15 | 2016-03-17 | Speedtech Energy Co.,Ltd. | Solar fan |
US9657742B2 (en) * | 2014-09-15 | 2017-05-23 | Speedtech Energy Co., Ltd. | Solar fan |
EP3156875A1 (en) * | 2015-10-16 | 2017-04-19 | Giga-Byte Technology Co., Ltd. | Heat dissipation module, display card assembly and electronic device |
US9904332B2 (en) | 2015-10-16 | 2018-02-27 | Giga-Byte Technology Co., Ltd. | Heat dissipation module, display card assembly and electronic device |
CN112012948A (en) * | 2019-05-31 | 2020-12-01 | 台达电子工业股份有限公司 | Counter-rotating fan structure |
Also Published As
Publication number | Publication date |
---|---|
TW201120319A (en) | 2011-06-16 |
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