US20100074747A1 - Mini axial fan with an improved core shaft structure - Google Patents
Mini axial fan with an improved core shaft structure Download PDFInfo
- Publication number
- US20100074747A1 US20100074747A1 US12/234,712 US23471208A US2010074747A1 US 20100074747 A1 US20100074747 A1 US 20100074747A1 US 23471208 A US23471208 A US 23471208A US 2010074747 A1 US2010074747 A1 US 2010074747A1
- Authority
- US
- United States
- Prior art keywords
- fan
- mini
- hub
- axial fan
- axial
- 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
- 229920003023 plastic Polymers 0.000 claims abstract description 20
- 239000004033 plastic Substances 0.000 claims abstract description 20
- 230000004308 accommodation Effects 0.000 claims description 7
- 229910000677 High-carbon steel Inorganic materials 0.000 claims description 2
- QCWXUUIWCKQGHC-UHFFFAOYSA-N Zirconium Chemical compound [Zr] QCWXUUIWCKQGHC-UHFFFAOYSA-N 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 8
- 239000002184 metal Substances 0.000 abstract description 8
- 238000002347 injection Methods 0.000 abstract 1
- 239000007924 injection Substances 0.000 abstract 1
- 238000000465 moulding Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000001746 injection moulding Methods 0.000 description 3
- 230000008602 contraction Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000001595 contractor effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 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
- F04D25/062—Details of the bearings
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/046—Bearings
- F04D29/0467—Spherical bearings
-
- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
Definitions
- the present invention relates to a mini axial fan and, more particularly, to a mini axial fan with an improved core shaft structure for use in a computer or computer-related electronic apparatus as an effective heat dissipation device for forced air convection cooling.
- FIG. 9 shows a conventional mini axial fan for use in a computer or computer-related electronic apparatus for forced air convection cooling.
- the mini axial fan comprises a fan housing 10 , and a fan 20 rotatably mounted inside the fan housing 10 .
- the fan 20 comprises a fan hub 201 and a fan shaft 202 mounted in the fan hub 201 (see FIG. 10 ).
- the fan shaft 202 is pivotally coupled to a bearing in the fan housing 10 so that the fan 20 is rotatable relative to the fan housing 10 .
- the fan shaft 202 and the fan hub 201 are bonded together by means of insert molding, i.e., the fan shaft 202 is put in the mold of an insert molding machine by labor, and then a fluid plastic material is filled into the mold and molded into the desired fan 20 .
- This fan fabrication method has the drawbacks of low production efficiency and low precision. Further, expansion and contraction of the plastic material during molding may cause deformation or displacement of the fan shaft, affecting the precision of the mini axial fan. Because the design trend for modern electronic products is to achieve the characteristics of being light, thin, short and small, it's difficult for the aforesaid fan fabrication method to achieve these characteristics with the expected precision. Further, the manufacturing cost of this fan fabrication method is still relatively high.
- the present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a mini axial fan with an improved core shaft structure, which has metal pins respectively press-fitted into a respective plastic axle at each of two opposite sides of a plastic fan hub for rotatably supporting the fan unit inside a plastic fan housing, thereby eliminating the drawbacks of prior art insert molding technique, improving the production efficiency, and lowering the manufacturing cost.
- the mini axial fan comprises a fan housing and a fan unit mounted inside the fan housing.
- the fan housing comprises a plastic hub, which defines a backward hole, a plurality of plastic blades formed integral with and radially arranged around the periphery of the hub, two integrated plastic axles respectively extended from the front and back sides of the plastic hub at the center and axially aligned, each axle having a blind hole axially defined in the respective free end, and two metal pins respectively press-fitted into the blind holes of the axles for rotatably supporting the fan unit in the fan housing.
- the metal pins are respectively press-fitted into the blind holes of the plastic axles after injection molding of the plastic hub, the plastic blades and the plastic axles, and therefore the installation precision of the metal pins is free from the expansion and contraction effects of the plastic material during the injection molding of the fan unit, i.e., the invention eliminates the drawbacks of the aforesaid prior art mini axial fan design that employs an insert molding technique.
- FIG. 1 is an exploded view of a mini axial fan in accordance with the present invention.
- FIG. 2 is an assembly view of the mini axial fan shown in FIG. 1 .
- FIG. 3 is a sectional view of the mini axial fan in accordance with the present invention.
- FIG. 4 is a schematic sectional view of a part of the present invention, showing the conical point of the pin positioned in the recessed hole of the associated bearing.
- FIG. 5 is an oblique top view of the fan unit of the mini axial fan according to the present invention.
- FIG. 6 is an oblique bottom view of the fan unit of the mini axial fan according to the present invention.
- FIG. 7 is an exploded sectional view of the fan unit of the mini axial fan according to the present invention.
- FIG. 8 is a sectional assembly view of FIG. 7 .
- FIG. 9 is an oblique top view of a mini axial fan according to the prior art.
- FIG. 10 is a sectional view of the fan unit of the mini axial fan shown in FIG. 9 .
- a mini axial fan comprises a fan housing 1 and a fan unit 2 mounted in the fan housing 1 .
- the fan housing 1 is a plastic frame shell having a motor stator 11 mounted therein for driving the fan unit 2 .
- the fan housing 1 can be made in a rectangular shape as shown in the annexed drawings, in or any other geometric shape.
- the fan housing 1 comprises a circular fan accommodation chamber 12 , two bearing holders 13 disposed at top and bottom sides in the circular fan accommodation chamber 12 , a plurality of radial ribs 14 respectively equiangularly spaced around the bearing holders 13 and respectively connected between the bearing holders 13 and the peripheral wall of the fan housing 1 , and two bearings 15 formed of a metal or ceramic material and respectively mounted in the bearing holders 13 at an inner side.
- Each bearing 15 has a recessed hole 151 at the center for the positioning of a respective pin 27 of the fan unit 2 .
- the aforesaid motor stator 11 is an electric device mounted in between the bearing holders 13 for driving the fan unit 2 .
- the fan unit 2 comprises a hub 21 , which defines a backward hole 23 , a plurality of blades 22 radially arranged around the hub 21 , a motor rotor 24 mounted in the backward hole 23 inside the hub 21 , two axles 25 and 25 ′ respectively extending from the front and back sides of the hub 21 at the center and axially aligned and having a respective blind hole 26 axially defined in the respective free end, and two pins 27 respectively press-fitted into the blind holes 26 of the axles 25 and 25 ′ and terminating in a respective conical point 271 outside the axles 25 and 25 ′ (see FIGS. 7 and 8 ).
- the blades 22 can be configured to provide 3 D curves, or made in any of a variety of other shapes.
- the hub 21 , the blades 22 and the axles 25 and 25 ′ are injection-molded from plastics in one piece.
- the pins 27 are formed of high carbon steel or zirconium, having the characteristics of high hardness and excellent wear-resistance suitable for a prolonged service life of the fan.
- the fan unit 2 is mounted in the circular fan accommodation chamber 12 of the fan housing 1 to receive the motor stator 11 in the backward hole 23 of the hub 21 , i.e. the motor stator 11 and the motor rotor 24 are matched to each other.
- the conical points 271 of the pins 27 are respectively positioned in the recessed holes 151 of the bearings 15 (as shown in FIG. 4 ).
- the hub 21 , the blades 22 and the axles 25 and 25 ′ are injection-molded from plastics in one piece, and then the pins 27 are respectively press-fitted into the blind holes 26 of the axles 25 and 25 ′ by means of a tool (see FIG. 7 ), leaving the conical points 271 of the pins 27 protruded outside the axles 25 and 25 ′ (see FIG. 8 ).
- This design simplifies the fabrication of the fan 2 , facilitating molding and mold stripping operations. Therefore, the invention is suitable for mass production to lower the manufacturing cost.
- the fan unit 2 of the present invention meets the requirements of a mini axial fan having the characteristics of small size and high precision.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- (a) Field of the Invention
- The present invention relates to a mini axial fan and, more particularly, to a mini axial fan with an improved core shaft structure for use in a computer or computer-related electronic apparatus as an effective heat dissipation device for forced air convection cooling.
- (b) Description of the Prior Art
-
FIG. 9 shows a conventional mini axial fan for use in a computer or computer-related electronic apparatus for forced air convection cooling. According to this design, the mini axial fan comprises afan housing 10, and afan 20 rotatably mounted inside thefan housing 10. Thefan 20 comprises afan hub 201 and afan shaft 202 mounted in the fan hub 201 (seeFIG. 10 ). Thefan shaft 202 is pivotally coupled to a bearing in thefan housing 10 so that thefan 20 is rotatable relative to thefan housing 10. According to the aforesaid mini axial fan design, thefan shaft 202 and thefan hub 201 are bonded together by means of insert molding, i.e., thefan shaft 202 is put in the mold of an insert molding machine by labor, and then a fluid plastic material is filled into the mold and molded into the desiredfan 20. This fan fabrication method has the drawbacks of low production efficiency and low precision. Further, expansion and contraction of the plastic material during molding may cause deformation or displacement of the fan shaft, affecting the precision of the mini axial fan. Because the design trend for modern electronic products is to achieve the characteristics of being light, thin, short and small, it's difficult for the aforesaid fan fabrication method to achieve these characteristics with the expected precision. Further, the manufacturing cost of this fan fabrication method is still relatively high. - The present invention has been accomplished under the circumstances in view. It is one object of the present invention to provide a mini axial fan with an improved core shaft structure, which has metal pins respectively press-fitted into a respective plastic axle at each of two opposite sides of a plastic fan hub for rotatably supporting the fan unit inside a plastic fan housing, thereby eliminating the drawbacks of prior art insert molding technique, improving the production efficiency, and lowering the manufacturing cost.
- To achieve this and other objects of the present invention, the mini axial fan comprises a fan housing and a fan unit mounted inside the fan housing. The fan housing comprises a plastic hub, which defines a backward hole, a plurality of plastic blades formed integral with and radially arranged around the periphery of the hub, two integrated plastic axles respectively extended from the front and back sides of the plastic hub at the center and axially aligned, each axle having a blind hole axially defined in the respective free end, and two metal pins respectively press-fitted into the blind holes of the axles for rotatably supporting the fan unit in the fan housing.
- According to the present invention, the metal pins are respectively press-fitted into the blind holes of the plastic axles after injection molding of the plastic hub, the plastic blades and the plastic axles, and therefore the installation precision of the metal pins is free from the expansion and contraction effects of the plastic material during the injection molding of the fan unit, i.e., the invention eliminates the drawbacks of the aforesaid prior art mini axial fan design that employs an insert molding technique.
-
FIG. 1 is an exploded view of a mini axial fan in accordance with the present invention. -
FIG. 2 is an assembly view of the mini axial fan shown inFIG. 1 . -
FIG. 3 is a sectional view of the mini axial fan in accordance with the present invention. -
FIG. 4 is a schematic sectional view of a part of the present invention, showing the conical point of the pin positioned in the recessed hole of the associated bearing. -
FIG. 5 is an oblique top view of the fan unit of the mini axial fan according to the present invention. -
FIG. 6 is an oblique bottom view of the fan unit of the mini axial fan according to the present invention. -
FIG. 7 is an exploded sectional view of the fan unit of the mini axial fan according to the present invention. -
FIG. 8 is a sectional assembly view ofFIG. 7 . -
FIG. 9 is an oblique top view of a mini axial fan according to the prior art. -
FIG. 10 is a sectional view of the fan unit of the mini axial fan shown inFIG. 9 . - As shown in the annexed drawings in detail, a mini axial fan comprises a
fan housing 1 and afan unit 2 mounted in thefan housing 1. - As shown in
FIGS. 13 , thefan housing 1 is a plastic frame shell having amotor stator 11 mounted therein for driving thefan unit 2. Thefan housing 1 can be made in a rectangular shape as shown in the annexed drawings, in or any other geometric shape. Thefan housing 1 comprises a circularfan accommodation chamber 12, twobearing holders 13 disposed at top and bottom sides in the circularfan accommodation chamber 12, a plurality ofradial ribs 14 respectively equiangularly spaced around thebearing holders 13 and respectively connected between thebearing holders 13 and the peripheral wall of thefan housing 1, and twobearings 15 formed of a metal or ceramic material and respectively mounted in thebearing holders 13 at an inner side. Each bearing 15 has arecessed hole 151 at the center for the positioning of arespective pin 27 of thefan unit 2. Theaforesaid motor stator 11 is an electric device mounted in between thebearing holders 13 for driving thefan unit 2. - Referring to
FIGS. 5˜8 , thefan unit 2 comprises ahub 21, which defines abackward hole 23, a plurality ofblades 22 radially arranged around thehub 21, amotor rotor 24 mounted in thebackward hole 23 inside thehub 21, twoaxles hub 21 at the center and axially aligned and having a respectiveblind hole 26 axially defined in the respective free end, and twopins 27 respectively press-fitted into theblind holes 26 of theaxles conical point 271 outside theaxles FIGS. 7 and 8 ). Theblades 22 can be configured to provide 3D curves, or made in any of a variety of other shapes. Thehub 21, theblades 22 and theaxles pins 27 are formed of high carbon steel or zirconium, having the characteristics of high hardness and excellent wear-resistance suitable for a prolonged service life of the fan. - Thus, as shown in
FIGS. 1 and 2 , thefan unit 2 is mounted in the circularfan accommodation chamber 12 of thefan housing 1 to receive themotor stator 11 in thebackward hole 23 of thehub 21, i.e. themotor stator 11 and themotor rotor 24 are matched to each other. At the same time, theconical points 271 of thepins 27 are respectively positioned in the recessedholes 151 of the bearings 15 (as shown inFIG. 4 ). When the mini axial fan is assembled (as shown inFIG. 2 ), it can be used in a computer or computer-related electronic apparatus as an effective heat dissipation device for forced air convection cooling. - During the fabrication of the core shaft structure of the mini axial fan, the
hub 21, theblades 22 and theaxles pins 27 are respectively press-fitted into theblind holes 26 of theaxles FIG. 7 ), leaving theconical points 271 of thepins 27 protruded outside theaxles FIG. 8 ). This design simplifies the fabrication of thefan 2, facilitating molding and mold stripping operations. Therefore, the invention is suitable for mass production to lower the manufacturing cost. After injection molding of thehub 21, theblades 22 and theaxles pins 27 are accurately fastened to theblind holes 26 of theaxles fan unit 2 of the present invention meets the requirements of a mini axial fan having the characteristics of small size and high precision. Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.
Claims (6)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/234,712 US20100074747A1 (en) | 2008-09-22 | 2008-09-22 | Mini axial fan with an improved core shaft structure |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/234,712 US20100074747A1 (en) | 2008-09-22 | 2008-09-22 | Mini axial fan with an improved core shaft structure |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100074747A1 true US20100074747A1 (en) | 2010-03-25 |
Family
ID=42037861
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/234,712 Abandoned US20100074747A1 (en) | 2008-09-22 | 2008-09-22 | Mini axial fan with an improved core shaft structure |
Country Status (1)
Country | Link |
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US (1) | US20100074747A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100074746A1 (en) * | 2008-09-25 | 2010-03-25 | Risun Expanse Corp. | Fan positioning structure |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568243A (en) * | 1981-10-08 | 1986-02-04 | Barry Wright Corporation | Vibration isolating seal for mounting fans and blowers |
US4861237A (en) * | 1985-11-07 | 1989-08-29 | Shicoh Engineering Co., Ltd. | Axial-flow fan apparatus |
US5492458A (en) * | 1994-01-04 | 1996-02-20 | Horng; Alex | Stator of electric fan |
US6009919A (en) * | 1997-12-18 | 2000-01-04 | Rumbley, Iii; Edward R | Method for converting a ball and socket to a dowel pin joint on a water jet loom and product produced thereby |
-
2008
- 2008-09-22 US US12/234,712 patent/US20100074747A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4568243A (en) * | 1981-10-08 | 1986-02-04 | Barry Wright Corporation | Vibration isolating seal for mounting fans and blowers |
US4861237A (en) * | 1985-11-07 | 1989-08-29 | Shicoh Engineering Co., Ltd. | Axial-flow fan apparatus |
US5492458A (en) * | 1994-01-04 | 1996-02-20 | Horng; Alex | Stator of electric fan |
US6009919A (en) * | 1997-12-18 | 2000-01-04 | Rumbley, Iii; Edward R | Method for converting a ball and socket to a dowel pin joint on a water jet loom and product produced thereby |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100074746A1 (en) * | 2008-09-25 | 2010-03-25 | Risun Expanse Corp. | Fan positioning structure |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: YU, CHIEN-CHUN,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:YU, CHIEN-CHUN;YU, CHUNG-LUNG;YANG, YU-CHING;REEL/FRAME:021560/0854 Effective date: 20080917 |
|
AS | Assignment |
Owner name: YU, CHUNG-LUNG,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YU, CHIEN-CHUN;REEL/FRAME:021840/0566 Effective date: 20081107 Owner name: YANG, YU-CHING,TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:YU, CHIEN-CHUN;REEL/FRAME:021840/0566 Effective date: 20081107 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |