US20100322800A1 - Cooling fan - Google Patents
Cooling fan Download PDFInfo
- Publication number
- US20100322800A1 US20100322800A1 US12/541,181 US54118109A US2010322800A1 US 20100322800 A1 US20100322800 A1 US 20100322800A1 US 54118109 A US54118109 A US 54118109A US 2010322800 A1 US2010322800 A1 US 2010322800A1
- Authority
- US
- United States
- Prior art keywords
- central tube
- insulating frame
- stator
- stator core
- cooling fan
- 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
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/60—Mounting; Assembling; Disassembling
- F04D29/64—Mounting; Assembling; Disassembling of axial pumps
- F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
- F04D29/646—Mounting or removal of 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
- 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
- F04D25/0646—Details of the stator
Definitions
- the present disclosure relates to a cooling fan, and particularly to a cooling fan having a stator firmly mounted thereon.
- heat-generating electric components such as CPUs (central processing units) are generating more and more heat which requires immediate dissipation. Cooling fans are commonly used in combination with heat sinks for cooling the CPUs.
- a typical cooling fan includes a fan housing forming a base at a central portion thereof, a stator mounted on the base and a rotor rotatably supported by the stator.
- the stator is mounted around a central tube formed at a central portion of the base and stuck to the central tube with glue.
- glue cannot firmly secure the stator on the central tube.
- the cooling fan may suffer a crash during transportation which may result in a separation of the stator from the central tube.
- FIG. 1 is a sectional view of a cooling fan in accordance with an exemplary embodiment.
- FIG. 2 is an exploded, isometric view of a stator and a central tube of a fan housing of the cooling fan of FIG. 1 , with a circuit board and coils being removed from the stator for clarity.
- FIG. 3 is a top plan view of the stator of FIG. 2 , also with the circuit board and the coils being removed for clarity.
- FIG. 4 is an enlarged view of a portion of the cooling fan of FIG. 1 , in which the stator is to be mounted to the central tube.
- FIG. 5 is an enlarged view of a circled portion V of FIG. 1 , in which the stator has been mounted to the central tube.
- FIG. 6 is a view similar to FIG. 2 , with the central tube of the fan housing of the cooling fan being modified.
- FIG. 1 shows a cooling fan 100 in accordance with an exemplary embodiment of the disclosure.
- the cooling fan 100 includes a fan housing 10 , a stator 20 and a rotor 30 received in the fan housing 10 .
- the rotor 30 includes a cylindrical hub 32 and a plurality of blades 38 .
- the hub 32 includes a top wall 322 and a sidewall 324 extending downwardly from a circumferential edge of the top wall 322 .
- a shaft 34 extends downwardly from a central portion of the top wall 322 and forms a free end 343 .
- the blades 38 extend radially and outwardly from an outer periphery of the sidewall 324 of the hub 32 .
- the stator 20 includes a PCB 26 (printed circuit board), a stator core 22 , upper and lower insulating frames 28 , 29 , and a plurality of stator coils 24 .
- the upper and lower insulating frames 28 , 29 are attached to top and bottom sides of the stator core 22 , respectively.
- the stator coils 24 are wound on the upper and lower insulating frames 28 , 29 and around the stator core 22 .
- the stator coils 24 are electrically separated from the stator core 22 by the upper and lower insulating frames 28 , 29 .
- the PCB 26 is attached to a bottom side of the lower insulating frame 29 and electrically connected with the stator coils 24 to control an electrical current flowing through the stator coils 24 .
- the stator core 22 includes an annular body 222 defining a through hole 40 therein and a plurality of claws 224 extending radially and outwardly from an outer periphery of the annular body 222 .
- Each claw 224 has a T-like shape and includes an arced wing 226 formed at a distal end thereof.
- the claws 224 are spaced from each other and evenly arranged around the annular body 222 along a circumferential direction of the annular body 222 .
- the wings 226 are arranged on an imaginary circle around the annular body 222 . Every two neighboring claws 224 and a corresponding portion of the annular body 222 between the two neighboring claws 224 cooperatively define a winding slot 228 thereamong.
- the upper insulating frame 28 has an outline corresponding to a profile of the stator core 22 .
- the upper insulating frame 28 includes a main body 282 corresponding to the annular body 222 of the stator core 22 and a plurality of protecting arms 284 corresponding to the claws 224 of the stator core 22 .
- the main body 282 is annular and defines a through hole 40 therein.
- the main body 282 has an inner diameter greater than that of the annular body 222 of the stator core 22 .
- the protecting arms 284 each are generally T-shaped. The protecting arms 284 extend radially and outwardly from an outer circumferential surface of a bottom edge of the main body 282 .
- the main body 282 and the protecting arms 284 form a plurality of flanges 286 at edges thereof.
- the flanges 286 extend downwardly from the edges of the main body 282 and the protecting arms 284 into the winding slots 228 of the stator core 22 , when the upper insulating frame 28 is attached to the stator core 22 .
- a plurality of protrusion tabs 281 extend inwardly from an inner circumferential surface of the bottom edge of the main body 282 in an opposite direction to the protecting arms 284 .
- the protrusion tabs 281 are evenly arranged along a circumferential direction of the main body 282 and protrude inwardly into the through hole 40 of the upper insulating frame 28 .
- Inner free ends of the protrusion tabs 281 cooperatively define an imaginary circle which has a diameter slightly smaller than the inner diameter of the annular body 222 of the stator core 22 .
- Each protrusion tab 281 is substantially trapezoid-shaped and aligned with a corresponding protecting arm 284 .
- Each protrusion tab 281 includes an outer end connected with the main body 282 . The inner free end of each protrusion tab 281 is located in the through hole 40 of the upper insulating frame 28 .
- the lower insulating frame 29 has a configuration similar to the upper insulating frame 28 .
- the lower insulating frame 29 also includes a main body 292 located at a central portion and a plurality of protecting arms 294 extending radially and outwardly from an outer circumferential surface of the main body 292 .
- the main body 292 also defines a through hole 40 therein.
- the through holes 40 of the annular body 222 of the stator core 22 and the main bodies 282 , 292 of the upper and lower insulating frames are aligned with each other to cooperatively define a mounting hole 50 through the stator 20 along an axial direction thereof.
- a plurality of flanges 296 extend upwardly from edges of the main body 292 and the protecting arms 294 for inserting into the winding slots 228 of the stator core 22 .
- the lower insulating frame 29 differs from the upper insulating frame 28 only in that the lower insulating frame 29 does not form the protrusion tabs 281 .
- the upper insulating frame 28 is attached to the top side of the stator core 22 , with the flanges 286 extending into the winding slots 228 to cover an upper portion of the stator core 22 .
- the protrusion tabs 281 of the upper insulating frame 28 are located on the annular body 222 of the stator core 22 with outer ends of the protrusion tabs 281 rested on the annular body 222 and the inner free ends of the protrusion tabs 281 protruding inwardly beyond the annular body 222 into the through hole 40 of the stator core 22 .
- the lower insulating frame 29 is attached to the bottom side of the stator core 22 .
- the flanges 296 of the lower insulating frame 29 extend into the winding slots 228 to cover a lower portion of the stator core 22 .
- the stator coils 24 are wound on the protecting arms 284 , 294 of the upper and lower insulating frames 28 , 29 , and electrically insulated from the stator core 22 by the upper and lower insulating frames 28 , 29 .
- the fan housing 10 includes a square-shaped hollow casing 12 , a base 14 arranged at a central portion of the casing 12 and a plurality of ribs 16 connecting the base 14 to the casing 12 .
- the fan housing 10 defines an air outlet 17 at a top side and an opposite air inlet 18 at a bottom side thereof.
- the base 14 is located at a center of the air inlet 18 .
- a central tube 15 extends upwardly from a central portion of the base 14 towards the air outlet 17 for mounting the stator 20 thereon.
- the casing 12 , the base 14 and the ribs 16 can be made of plastic material and integrally formed by plastic injection molding.
- the central tube 15 may be made of metal or plastic material. In this embodiment, the central tube 15 is made of copper.
- the central tube 15 is preformed first and then connected with the base 14 by insert molding technique, during the formation of the casing 12 .
- the central tube 15 is column-shaped and defines a through hole 150 therein along an axial direction thereof.
- the central tube 15 includes a main section 154 , a fixing section 152 formed at a top end of the main portion 154 and a securing section 156 formed at a bottom end of the main section 154 .
- the fixing section 152 has a diameter smaller than that of the main section 154 , whereby a step 159 is formed between the fixing section 152 and the main section 154 .
- the diameter of the main portion 154 is smaller than that of the securing section 156 .
- the diameter of the fixing section 152 is equal to the diameter of the through hole 40 of the annular body 222 of the stator core 22 , such that the fixing section 152 can extend through the stator core 22 to mount the stator 20 around the central tube 15 .
- a chamfer 157 is formed at a top end of the fixing section 152 .
- An annular engaging slot 155 is defined around an outer circumferential surface of the fixing section 152 under the chamfer 157 .
- the engaging slot 155 is recessed inwardly from the outer circumferential surface of the central tube 15 for extension of the inner free ends of the protrusion tabs 281 of the upper insulating frame 28 therein.
- the diameter of the central tube 15 at the engaging slot 155 is not larger than that of the imaginary circle cooperatively defined by the inner free ends of the protrusion tabs 281 .
- An annular top flange 153 extends outwardly from an outer circumferential surface of a top end of the securing section 156
- an annular bottom flange 151 extends outwardly from an outer circumferential surface of a bottom end of the securing section 156 .
- the top and bottom flanges 153 , 151 are parallel to and spaced from each other.
- the securing section 156 is located between the top and bottom flanges 153 , 151 .
- the top and bottom flanges 153 , 151 each have a diameter greater than that of the securing section 156 .
- the base 14 has a portion (not labeled) extending into a space between the top and bottom flanges 153 , 151 to engage with the securing portion 156 of the central tube 15 , thereby securing the base 14 and the central tube 15 together.
- a top surface of the top flange 153 and a bottom surface of the bottom flange 151 are respectively coplanar to top and bottom surfaces of the base 14 , to enhance a connection of the central tube 15 and the base 14 and prevent the central tube 15 from separating from the base 14 .
- An inner annular flange 158 extends inwardly from an inner circumferential surface of a middle portion of the central tube 15 .
- a pair of bearings 80 are received in the through hole 150 of the central tube 15 .
- the top bearing 80 abuts a top surface of the annular flange 158 .
- a spring (not labeled) is sandwiched between a bottom surface of the annular flange 158 and the bottom bearing 80 .
- the stator 20 is pressed downwardly around the central tube 15 during which the fixing section 152 of the central tube 15 extends sequentially through the PCB 26 , the lower insulating frame 29 , the stator core 22 and the upper insulating frame 28 of the stator 20 .
- the fixing section 152 can extend through the PCB 26 , the lower insulating frame 29 and the stator core 22 easily.
- the inner free ends of the protrusion tabs 281 abut against the chamfer 157 of the fixing section 152 of the central tube 15 because the diameter of the imaginary circle cooperatively defined by the inner free ends of the protrusion tabs 281 is smaller than that of the fixing section 152 of the central tube 15 . Then the protrusion tabs 281 are caused to deform due to the urging force exerted thereon by the top end of the fixing section 152 of the central tube 15 . Guided by the chamfer 157 of the fixing section 152 of the central tube 15 , the protrusion tabs 281 are further deformed until they are moved to a position to enter the engaging slot 155 of the central tube 15 .
- the chamfer 157 of the fixing section 152 of the central tube 15 facilitates the assembly of the stator 20 onto the central tube 15 . Furthermore, since the protrusion tabs 281 are formed on the upper insulating frame 28 , an operator or user can easily check whether the protrusion tabs 281 are engaged into the engaging slot 155 completely to guarantee a good assembly quality of the stator 20 onto the central tube 15 .
- FIG. 6 shows a fan housing 60 according to an alternative embodiment; the fan housing 60 differs from the fan housing 10 of the previous embodiment in that a central tube 65 of this embodiment is made of plastic material and integrally formed with the base 64 by plastic injection molding.
- the central tube 65 defines a plurality of elongate engaging slots 655 therethrough along an axial direction of the central tube 65 .
- the engaging slots 655 each extend downwardly from a top end towards a bottom end of the central tube 15 .
- the engaging slots 655 are parallel to and spaced from each other around a circumferential direction of the central tube 65 .
- a width of each engaging slot 655 is substantially equal to that of each of the protrusion tabs 281 of the upper insulating frame 28 .
- the protrusion tabs 281 are received and engaged in the engaging slots 655 , respectively.
- the engagement of the protrusion tabs 281 in the spaced engaging slots 655 not only restricts an upward movement of the stator 20 away from the central tube 65 , but also a rotation of the stator 20 relative to the central tube 65 along the circumferential direction of the central tube 65 .
Abstract
Description
- 1. Technical Field
- The present disclosure relates to a cooling fan, and particularly to a cooling fan having a stator firmly mounted thereon.
- 2. Description of Related Art
- With continuing development of electronic technology, heat-generating electric components such as CPUs (central processing units) are generating more and more heat which requires immediate dissipation. Cooling fans are commonly used in combination with heat sinks for cooling the CPUs.
- A typical cooling fan includes a fan housing forming a base at a central portion thereof, a stator mounted on the base and a rotor rotatably supported by the stator. The stator is mounted around a central tube formed at a central portion of the base and stuck to the central tube with glue. However, the glue cannot firmly secure the stator on the central tube. For example, the cooling fan may suffer a crash during transportation which may result in a separation of the stator from the central tube.
- Therefore, a cooling fan is desired to overcome the above described shortcoming.
-
FIG. 1 is a sectional view of a cooling fan in accordance with an exemplary embodiment. -
FIG. 2 is an exploded, isometric view of a stator and a central tube of a fan housing of the cooling fan ofFIG. 1 , with a circuit board and coils being removed from the stator for clarity. -
FIG. 3 is a top plan view of the stator ofFIG. 2 , also with the circuit board and the coils being removed for clarity. -
FIG. 4 is an enlarged view of a portion of the cooling fan ofFIG. 1 , in which the stator is to be mounted to the central tube. -
FIG. 5 is an enlarged view of a circled portion V ofFIG. 1 , in which the stator has been mounted to the central tube. -
FIG. 6 is a view similar toFIG. 2 , with the central tube of the fan housing of the cooling fan being modified. -
FIG. 1 shows acooling fan 100 in accordance with an exemplary embodiment of the disclosure. Thecooling fan 100 includes afan housing 10, astator 20 and arotor 30 received in thefan housing 10. - The
rotor 30 includes acylindrical hub 32 and a plurality ofblades 38. Thehub 32 includes atop wall 322 and asidewall 324 extending downwardly from a circumferential edge of thetop wall 322. Ashaft 34 extends downwardly from a central portion of thetop wall 322 and forms afree end 343. Theblades 38 extend radially and outwardly from an outer periphery of thesidewall 324 of thehub 32. - The
stator 20 includes a PCB 26 (printed circuit board), astator core 22, upper and lowerinsulating frames stator coils 24. The upper and lowerinsulating frames stator core 22, respectively. Thestator coils 24 are wound on the upper and lowerinsulating frames stator core 22. Thus, thestator coils 24 are electrically separated from thestator core 22 by the upper and lowerinsulating frames insulating frame 29 and electrically connected with thestator coils 24 to control an electrical current flowing through thestator coils 24. - Referring to
FIGS. 2 and 3 , thestator core 22 includes anannular body 222 defining a throughhole 40 therein and a plurality ofclaws 224 extending radially and outwardly from an outer periphery of theannular body 222. Eachclaw 224 has a T-like shape and includes anarced wing 226 formed at a distal end thereof. Theclaws 224 are spaced from each other and evenly arranged around theannular body 222 along a circumferential direction of theannular body 222. Thewings 226 are arranged on an imaginary circle around theannular body 222. Every two neighboringclaws 224 and a corresponding portion of theannular body 222 between the two neighboringclaws 224 cooperatively define awinding slot 228 thereamong. - The upper
insulating frame 28 has an outline corresponding to a profile of thestator core 22. The upperinsulating frame 28 includes amain body 282 corresponding to theannular body 222 of thestator core 22 and a plurality of protectingarms 284 corresponding to theclaws 224 of thestator core 22. Themain body 282 is annular and defines a throughhole 40 therein. Themain body 282 has an inner diameter greater than that of theannular body 222 of thestator core 22. The protectingarms 284 each are generally T-shaped. The protectingarms 284 extend radially and outwardly from an outer circumferential surface of a bottom edge of themain body 282. Themain body 282 and the protectingarms 284 form a plurality offlanges 286 at edges thereof. Theflanges 286 extend downwardly from the edges of themain body 282 and the protectingarms 284 into thewinding slots 228 of thestator core 22, when the upperinsulating frame 28 is attached to thestator core 22. - A plurality of
protrusion tabs 281 extend inwardly from an inner circumferential surface of the bottom edge of themain body 282 in an opposite direction to the protectingarms 284. Theprotrusion tabs 281 are evenly arranged along a circumferential direction of themain body 282 and protrude inwardly into thethrough hole 40 of the upper insulatingframe 28. Inner free ends of theprotrusion tabs 281 cooperatively define an imaginary circle which has a diameter slightly smaller than the inner diameter of theannular body 222 of thestator core 22. Eachprotrusion tab 281 is substantially trapezoid-shaped and aligned with a correspondingprotecting arm 284. Eachprotrusion tab 281 includes an outer end connected with themain body 282. The inner free end of eachprotrusion tab 281 is located in the throughhole 40 of the upper insulatingframe 28. - The lower
insulating frame 29 has a configuration similar to the upper insulatingframe 28. The lowerinsulating frame 29 also includes amain body 292 located at a central portion and a plurality of protectingarms 294 extending radially and outwardly from an outer circumferential surface of themain body 292. Themain body 292 also defines a throughhole 40 therein. The throughholes 40 of theannular body 222 of thestator core 22 and themain bodies mounting hole 50 through thestator 20 along an axial direction thereof. A plurality offlanges 296 extend upwardly from edges of themain body 292 and the protectingarms 294 for inserting into thewinding slots 228 of thestator core 22. The lowerinsulating frame 29 differs from the upper insulatingframe 28 only in that the lowerinsulating frame 29 does not form theprotrusion tabs 281. - The upper
insulating frame 28 is attached to the top side of thestator core 22, with theflanges 286 extending into thewinding slots 228 to cover an upper portion of thestator core 22. Theprotrusion tabs 281 of the upper insulatingframe 28 are located on theannular body 222 of thestator core 22 with outer ends of theprotrusion tabs 281 rested on theannular body 222 and the inner free ends of theprotrusion tabs 281 protruding inwardly beyond theannular body 222 into thethrough hole 40 of thestator core 22. The lowerinsulating frame 29 is attached to the bottom side of thestator core 22. Theflanges 296 of the lowerinsulating frame 29 extend into thewinding slots 228 to cover a lower portion of thestator core 22. Thestator coils 24 are wound on the protectingarms insulating frames stator core 22 by the upper and lowerinsulating frames - Referring back to
FIG. 1 , thefan housing 10 includes a square-shapedhollow casing 12, abase 14 arranged at a central portion of thecasing 12 and a plurality ofribs 16 connecting thebase 14 to thecasing 12. Thefan housing 10 defines anair outlet 17 at a top side and anopposite air inlet 18 at a bottom side thereof. Thebase 14 is located at a center of theair inlet 18. Acentral tube 15 extends upwardly from a central portion of the base 14 towards theair outlet 17 for mounting thestator 20 thereon. Thecasing 12, thebase 14 and theribs 16 can be made of plastic material and integrally formed by plastic injection molding. Thecentral tube 15 may be made of metal or plastic material. In this embodiment, thecentral tube 15 is made of copper. Thecentral tube 15 is preformed first and then connected with the base 14 by insert molding technique, during the formation of thecasing 12. - Referring to
FIG. 2 , thecentral tube 15 is column-shaped and defines a throughhole 150 therein along an axial direction thereof. Thecentral tube 15 includes amain section 154, a fixingsection 152 formed at a top end of themain portion 154 and asecuring section 156 formed at a bottom end of themain section 154. The fixingsection 152 has a diameter smaller than that of themain section 154, whereby astep 159 is formed between the fixingsection 152 and themain section 154. The diameter of themain portion 154 is smaller than that of the securingsection 156. The diameter of the fixingsection 152 is equal to the diameter of the throughhole 40 of theannular body 222 of thestator core 22, such that the fixingsection 152 can extend through thestator core 22 to mount thestator 20 around thecentral tube 15. Achamfer 157 is formed at a top end of the fixingsection 152. An annularengaging slot 155 is defined around an outer circumferential surface of the fixingsection 152 under thechamfer 157. The engagingslot 155 is recessed inwardly from the outer circumferential surface of thecentral tube 15 for extension of the inner free ends of theprotrusion tabs 281 of the upper insulatingframe 28 therein. The diameter of thecentral tube 15 at theengaging slot 155 is not larger than that of the imaginary circle cooperatively defined by the inner free ends of theprotrusion tabs 281. - An annular
top flange 153 extends outwardly from an outer circumferential surface of a top end of the securingsection 156, and anannular bottom flange 151 extends outwardly from an outer circumferential surface of a bottom end of the securingsection 156. The top andbottom flanges section 156 is located between the top andbottom flanges bottom flanges section 156. Thebase 14 has a portion (not labeled) extending into a space between the top andbottom flanges portion 156 of thecentral tube 15, thereby securing thebase 14 and thecentral tube 15 together. A top surface of thetop flange 153 and a bottom surface of thebottom flange 151 are respectively coplanar to top and bottom surfaces of thebase 14, to enhance a connection of thecentral tube 15 and thebase 14 and prevent thecentral tube 15 from separating from thebase 14. - An inner
annular flange 158 extends inwardly from an inner circumferential surface of a middle portion of thecentral tube 15. A pair ofbearings 80 are received in the throughhole 150 of thecentral tube 15. Thetop bearing 80 abuts a top surface of theannular flange 158. A spring (not labeled) is sandwiched between a bottom surface of theannular flange 158 and thebottom bearing 80. - Referring to
FIGS. 4 and 5 , in assembly of the coolingfan 100, thestator 20 is pressed downwardly around thecentral tube 15 during which thefixing section 152 of thecentral tube 15 extends sequentially through thePCB 26, the lower insulatingframe 29, thestator core 22 and the upper insulatingframe 28 of thestator 20. As an inner diameter of each of thePCB 26, the lower insulating 29 and thestator core 22 is not smaller than the diameter of the fixingsection 152 of thecentral tube 15, the fixingsection 152 can extend through thePCB 26, the lower insulatingframe 29 and thestator core 22 easily. However, when thestator 20 continuously moves downwardly, the inner free ends of theprotrusion tabs 281 abut against thechamfer 157 of the fixingsection 152 of thecentral tube 15 because the diameter of the imaginary circle cooperatively defined by the inner free ends of theprotrusion tabs 281 is smaller than that of the fixingsection 152 of thecentral tube 15. Then theprotrusion tabs 281 are caused to deform due to the urging force exerted thereon by the top end of the fixingsection 152 of thecentral tube 15. Guided by thechamfer 157 of the fixingsection 152 of thecentral tube 15, theprotrusion tabs 281 are further deformed until they are moved to a position to enter theengaging slot 155 of thecentral tube 15. In this state, a bottom of thestator core 22 abuts on thestep 159 of thecentral tube 15. Theprotrusion tabs 281 resume their original state and engage in theengaging slot 155 of thecentral tube 15. Thus, thestator 20 is fixed to thecentral tube 15 firmly. - In the embodiment, the
chamfer 157 of the fixingsection 152 of thecentral tube 15 facilitates the assembly of thestator 20 onto thecentral tube 15. Furthermore, since theprotrusion tabs 281 are formed on the upper insulatingframe 28, an operator or user can easily check whether theprotrusion tabs 281 are engaged into theengaging slot 155 completely to guarantee a good assembly quality of thestator 20 onto thecentral tube 15. -
FIG. 6 shows afan housing 60 according to an alternative embodiment; thefan housing 60 differs from thefan housing 10 of the previous embodiment in that acentral tube 65 of this embodiment is made of plastic material and integrally formed with the base 64 by plastic injection molding. Thecentral tube 65 defines a plurality of elongate engagingslots 655 therethrough along an axial direction of thecentral tube 65. The engagingslots 655 each extend downwardly from a top end towards a bottom end of thecentral tube 15. The engagingslots 655 are parallel to and spaced from each other around a circumferential direction of thecentral tube 65. A width of eachengaging slot 655 is substantially equal to that of each of theprotrusion tabs 281 of the upper insulatingframe 28. In assembly, theprotrusion tabs 281 are received and engaged in the engagingslots 655, respectively. The engagement of theprotrusion tabs 281 in the spaced engagingslots 655 not only restricts an upward movement of thestator 20 away from thecentral tube 65, but also a rotation of thestator 20 relative to thecentral tube 65 along the circumferential direction of thecentral tube 65. - It is to be understood, however, that even though numerous characteristics and advantages of the disclosure have been set forth in the foregoing description, together with details of the structure and function 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 (10)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN200910303466.8 | 2009-06-19 | ||
CN2009103034668A CN101929472A (en) | 2009-06-19 | 2009-06-19 | Cooling fan |
Publications (1)
Publication Number | Publication Date |
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US20100322800A1 true US20100322800A1 (en) | 2010-12-23 |
Family
ID=43354555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/541,181 Abandoned US20100322800A1 (en) | 2009-06-19 | 2009-08-14 | Cooling fan |
Country Status (2)
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US (1) | US20100322800A1 (en) |
CN (1) | CN101929472A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090047148A1 (en) * | 2007-08-15 | 2009-02-19 | Delta Electronics, Inc. | Fan and bearing bracket thereof |
CN105650010A (en) * | 2014-11-14 | 2016-06-08 | 富瑞精密组件(昆山)有限公司 | Fan |
US20170248145A1 (en) * | 2016-02-25 | 2017-08-31 | Johnson Electric S.A. | Outer-rotor motor and blower having the same |
US20180320701A1 (en) * | 2017-05-02 | 2018-11-08 | Asia Vital Components Co., Ltd. | Fan central barrel coupling structure |
US11682933B2 (en) * | 2018-12-03 | 2023-06-20 | Nidec Corporation | Motor and fan motor |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103835961A (en) * | 2012-11-23 | 2014-06-04 | 富瑞精密组件(昆山)有限公司 | Cooling fan |
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US6005312A (en) * | 1994-07-14 | 1999-12-21 | Matsushita Electric Industrial Co., Ltd. | High speed, high torque multipole brushless motor |
US7230357B2 (en) * | 2002-11-26 | 2007-06-12 | Ebm- Papst St. Georgen Gmbh & Co. Kg | External rotor motor and method for assembling such a motor |
US6759772B1 (en) * | 2002-12-18 | 2004-07-06 | Delta Electronics, Inc. | Fastening structure for securing stator of motor |
US20040264817A1 (en) * | 2003-05-13 | 2004-12-30 | Fuminori Satoji | Fluid bearing device |
US20050046286A1 (en) * | 2003-09-01 | 2005-03-03 | Sunonwealth Electric Machine Industry Co., Ltd. | Axial tube assembly for a motor |
US20090047148A1 (en) * | 2007-08-15 | 2009-02-19 | Delta Electronics, Inc. | Fan and bearing bracket thereof |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090047148A1 (en) * | 2007-08-15 | 2009-02-19 | Delta Electronics, Inc. | Fan and bearing bracket thereof |
US8974196B2 (en) * | 2007-08-15 | 2015-03-10 | Delta Electronics, Inc. | Fan and bearing bracket thereof |
CN105650010A (en) * | 2014-11-14 | 2016-06-08 | 富瑞精密组件(昆山)有限公司 | Fan |
US20170248145A1 (en) * | 2016-02-25 | 2017-08-31 | Johnson Electric S.A. | Outer-rotor motor and blower having the same |
US20180320701A1 (en) * | 2017-05-02 | 2018-11-08 | Asia Vital Components Co., Ltd. | Fan central barrel coupling structure |
US10539144B2 (en) * | 2017-05-02 | 2020-01-21 | Asia Vital Components Co., Ltd. | Fan central barrel coupling structure |
US11682933B2 (en) * | 2018-12-03 | 2023-06-20 | Nidec Corporation | Motor and fan motor |
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CN101929472A (en) | 2010-12-29 |
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