US20050214142A1 - Fan frame and mold for making the same - Google Patents
Fan frame and mold for making the same Download PDFInfo
- Publication number
- US20050214142A1 US20050214142A1 US10/989,862 US98986204A US2005214142A1 US 20050214142 A1 US20050214142 A1 US 20050214142A1 US 98986204 A US98986204 A US 98986204A US 2005214142 A1 US2005214142 A1 US 2005214142A1
- Authority
- US
- United States
- Prior art keywords
- fan frame
- apertures
- mold
- fan
- support member
- 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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
Definitions
- the present invention relates generally to cooling fans for use in heat dissipation assemblies for cooling electronic packages, and more particularly to a fan frame of a cooling fan and a mold for making the fan frame.
- FIG. 3 illustrates a conventional cooling fan 100 having a frame 101 with an inner cavity, and a blade set 103 rotatably received in the inner cavity.
- Four through holes 105 are formed at corners of the frame 101 respectively.
- the through holes 105 allow fasteners such as screws to extend therethrough and engage in another member, such as a fan holder which is secured on a heat sink, thereby mounting the cooling fan 100 on the heat sink.
- the periphery of the frame 101 adjacent each hole 105 is thinner than adjacent portion of the frame 101 , and therefore forms a localized area of high stress also referred to as stress concentration at the thinner portion of the frame 101 . When the screw 105 engages in the hole 105 , these thinner portions of the frame 101 at the holes 105 are prone to be damaged.
- FIG. 4 illustrates a mold for making the frame 101 of the conventional fan 100 .
- the mold comprises a female mold 90 and a male mold 80 inserting into the female mold 90 .
- a gap 70 is formed between the female mold 90 and the male mold 80 .
- the gap 70 has a shape of the frame 101 .
- molten plastic is injected into the gap 70 , and the mold is cooled to freeze the plastic to form the shape of the frame 101 .
- each post 92 is slim, and is connected to the bottom wall of the female mold 90 with only one end of the post 92 joining with the bottom wall of the female mold 90 .
- This configuration will cause stress concentration at a joint area 94 .
- the post 92 is subject to vibration or shock during transportation of the mold or subject to unexpected radial force during the molding process, the post 92 is very likely to break off from the joint area 94 .
- the present invention is directed to cooling fan whose fan frame has an improved resistance to breakage due to stress concentration.
- the present invention is also directed to a mold for making the fan frame which has improved resistance against unexpected shock or force.
- a cooling fan in comprises a fan frame, a blade set rotably mounted in the fan frame, a support member abutting the fan frame, and a plurality of fasteners mounting the fan frame on the support member.
- the fan frame defines an inner cavity receiving the blade set, a plurality of circular through apertures for insertion of the fasteners respectively, and a plurality of slits communicating with the through apertures to allow the through apertures to be resiliently expandable.
- a mold for make a fan frame comprises a male mold and a female mold cooperatively define a gap resembling the shape of the fan frame therebetween.
- the female mold comprises a main part having a bottom wall and a plurality of sidewalls extending from the bottom wall.
- a plurality of posts having a same height extends perpendicularly from the bottom wall.
- a connecting plate is connected between the main part and each of the posts.
- FIG. 1 is an exploded view of a preferred embodiment of a heat dissipation assembly having a cooling fan embodying features of the present invention
- FIG. 2 is a top, cut view of a mold for the fan frame of FIG. 1 ;
- FIG. 3 is a perspective view of a conventional cooling fan
- FIG. 4 is an assembled, cross-sectional view of a mold for the conventional cooling fan of FIG. 5 ;
- FIG. 5 is a top, cross sectional view of the female mold along line A-A of FIG. 4 ;
- FIG. 6 is a cross-sectional view of the female mold along line B-B of FIG. 5 .
- a heat dissipation assembly according to a preferred embodiment of the present invention comprises a support member 30 , a cooling fan 10 , and a plurality of fasteners such as screws 20 for mounting the cooling fan 10 to the support member 30 .
- the cooling fan 10 comprises a fan frame 11 defining an inner cavity, and a blade set 12 rotatably received in the inner cavity of the fan frame 11 .
- a plurality of circular apertures 18 is defined in the fan frame 11 around the cavity, for insertion of the screws 20 thereinto respectively.
- the fan frame 11 has a square outer periphery and the through apertures 18 are arranged at corners of the fan frame 11 respectively. Understandably, the outer periphery of the fan frame 11 can be round or other shapes according to practice.
- the fan frame 11 at each corner thereof splits so as to make each aperture 18 open outwardly, thereby defining a slit 19 at each of the corners to communicate with both a corresponding aperture 18 and an exterior of the fan frame 11 . These slits 19 allow the through apertures 18 to be resiliently expandable.
- the support member 30 is an element for mounting the fan frame 11 and varying with situations in which the cooling fan 10 is used.
- the cooling fan 10 cooperates with a heat sink to cool an electronic package
- the support member 30 is the heat sink if the cooling fan 10 is directly secured to the heat sink.
- the support member 30 is the fan holder.
- the cooling fan 10 is mounted to a wall of a computer enclosure at a venting hole thereof for ventilation of the computer enclosure, the support member is the wall of the computer enclosure.
- FIG. 2 a mold for making the fan frame 11 is shown.
- FIG. 2 only shows a female mold 50 .
- the female mold 50 comprises a bottom wall 52 and four sidewalls 54 extending perpendicularly from sides of the bottom wall 52 to cooperatively define an inner space therebetween.
- Four cylindrical posts 56 having a same height extend perpendicularly and upwardly from the bottom wall 52 , near the respective corners of the female mold 50 .
- a connecting plate 58 extends in a radial direction from a periphery of each post 56 to a junction of two adjacent sidewalls 54 .
- a junction line of each post 56 and a corresponding connecting plate 58 is parallel to the axis of the post 56 .
- Each connecting plate 58 has a same height with the post 56 .
- the conventional male mold such as the male mold 80 shown in FIG. 4
- the male mold 80 may be adopted to cooperate with the female mold 80 of the present invention to mold the fan frame 11 .
- the male mold 80 is received in the inner space of the female mold 50 .
- a gap resembling the shape of the fan frame is formed between the male mold 80 and the female mold 50 .
- molten plastic material is injected into the gap. After the molten plastic solidify to form the fan frame 11 , the male mold 80 is withdrawn from the female mold 50 . Then the fan frame 11 is removed from the female mold 50 .
- each post 56 connects to the main part of the female mold 50 not only by its bottom end fixed to the bottom wall 52 of the female mold 50 , but also by its periphery fixed to the connecting plate 58 which is connected to the sidewalls 54 .
- This arrangement greatly increases the joining force between the post 56 and the main part of the female mold 50 .
- the post 56 is thus able to withstand greater shock during transportation and radial force during molding process or machining of the post 56 itself.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
A heat dissipation assembly includes a fan frame (11), a blade set (12) rotably mounted in the fan frame, a support member (30) abutting the fan frame, and a number of fasteners (20) mounting the fan frame on the support member. The fan frame defines an inner cavity receiving the blade set, a number of circular through apertures (18) for insertion of the fasteners respectively, and a number of slits (19) communicating with the through apertures to allow the through apertures to be resiliently expandable. For making the fan frame, a female mold (50) includes a number of posts (56) extending therefrom, and a connecting plate (58) connected between a main part of the female mold and each post.
Description
- 1. Field of the Invention
- The present invention relates generally to cooling fans for use in heat dissipation assemblies for cooling electronic packages, and more particularly to a fan frame of a cooling fan and a mold for making the fan frame.
-
FIG. 3 illustrates aconventional cooling fan 100 having aframe 101 with an inner cavity, and a blade set 103 rotatably received in the inner cavity. Four throughholes 105 are formed at corners of theframe 101 respectively. The throughholes 105 allow fasteners such as screws to extend therethrough and engage in another member, such as a fan holder which is secured on a heat sink, thereby mounting thecooling fan 100 on the heat sink. The periphery of theframe 101 adjacent eachhole 105 is thinner than adjacent portion of theframe 101, and therefore forms a localized area of high stress also referred to as stress concentration at the thinner portion of theframe 101. When thescrew 105 engages in thehole 105, these thinner portions of theframe 101 at theholes 105 are prone to be damaged. -
FIG. 4 illustrates a mold for making theframe 101 of theconventional fan 100. The mold comprises afemale mold 90 and amale mold 80 inserting into thefemale mold 90. Agap 70 is formed between thefemale mold 90 and themale mold 80. Thegap 70 has a shape of theframe 101. In molding, molten plastic is injected into thegap 70, and the mold is cooled to freeze the plastic to form the shape of theframe 101. - Referring to
FIGS. 5 and 6 , in order to form the thoughholes 105 of theframe 101, fourposts 92 are formed on a bottom wall of thefemale mold 90. Eachpost 92 is slim, and is connected to the bottom wall of thefemale mold 90 with only one end of thepost 92 joining with the bottom wall of thefemale mold 90. This configuration will cause stress concentration at ajoint area 94. When thepost 92 is subject to vibration or shock during transportation of the mold or subject to unexpected radial force during the molding process, thepost 92 is very likely to break off from thejoint area 94. - For the foregoing reasons, there is a need for a fan frame which has an improved resistance against breakage, and also there is a need for a mold molding the fan frame which has an improved resistance against unexpected shock or force.
- The present invention is directed to cooling fan whose fan frame has an improved resistance to breakage due to stress concentration.
- The present invention is also directed to a mold for making the fan frame which has improved resistance against unexpected shock or force.
- A cooling fan in according with a preferred embodiment of the present invention comprises a fan frame, a blade set rotably mounted in the fan frame, a support member abutting the fan frame, and a plurality of fasteners mounting the fan frame on the support member. The fan frame defines an inner cavity receiving the blade set, a plurality of circular through apertures for insertion of the fasteners respectively, and a plurality of slits communicating with the through apertures to allow the through apertures to be resiliently expandable.
- A mold for make a fan frame according to a preferred embodiment of the present invention comprises a male mold and a female mold cooperatively define a gap resembling the shape of the fan frame therebetween. The female mold comprises a main part having a bottom wall and a plurality of sidewalls extending from the bottom wall. A plurality of posts having a same height extends perpendicularly from the bottom wall. A connecting plate is connected between the main part and each of the posts.
- Other objects, advantages and novel features of the present invention will be drawn from the following detailed description of the preferred embodiments of the present invention with attached drawings, in which:
-
FIG. 1 is an exploded view of a preferred embodiment of a heat dissipation assembly having a cooling fan embodying features of the present invention; -
FIG. 2 is a top, cut view of a mold for the fan frame ofFIG. 1 ; -
FIG. 3 is a perspective view of a conventional cooling fan; -
FIG. 4 is an assembled, cross-sectional view of a mold for the conventional cooling fan ofFIG. 5 ; -
FIG. 5 is a top, cross sectional view of the female mold along line A-A ofFIG. 4 ; and -
FIG. 6 is a cross-sectional view of the female mold along line B-B ofFIG. 5 . - Referring to
FIG. 1 , a heat dissipation assembly according to a preferred embodiment of the present invention comprises asupport member 30, acooling fan 10, and a plurality of fasteners such asscrews 20 for mounting thecooling fan 10 to thesupport member 30. - The
cooling fan 10 comprises afan frame 11 defining an inner cavity, and a blade set 12 rotatably received in the inner cavity of thefan frame 11. A plurality ofcircular apertures 18 is defined in thefan frame 11 around the cavity, for insertion of thescrews 20 thereinto respectively. In this exemplificative embodiment, thefan frame 11 has a square outer periphery and thethrough apertures 18 are arranged at corners of thefan frame 11 respectively. Understandably, the outer periphery of thefan frame 11 can be round or other shapes according to practice. Thefan frame 11 at each corner thereof splits so as to make eachaperture 18 open outwardly, thereby defining aslit 19 at each of the corners to communicate with both acorresponding aperture 18 and an exterior of thefan frame 11. Theseslits 19 allow thethrough apertures 18 to be resiliently expandable. - The
support member 30 is an element for mounting thefan frame 11 and varying with situations in which thecooling fan 10 is used. Suppose thecooling fan 10 cooperates with a heat sink to cool an electronic package, thesupport member 30 is the heat sink if thecooling fan 10 is directly secured to the heat sink. However, if a fan holder is used to retain thecooling fan 10 on the heat sink, thesupport member 30 is the fan holder. Suppose another situation, thecooling fan 10 is mounted to a wall of a computer enclosure at a venting hole thereof for ventilation of the computer enclosure, the support member is the wall of the computer enclosure. - Referring to
FIG. 2 , a mold for making thefan frame 11 is shown.FIG. 2 only shows afemale mold 50. Thefemale mold 50 comprises abottom wall 52 and foursidewalls 54 extending perpendicularly from sides of thebottom wall 52 to cooperatively define an inner space therebetween. Fourcylindrical posts 56 having a same height extend perpendicularly and upwardly from thebottom wall 52, near the respective corners of thefemale mold 50. A connectingplate 58 extends in a radial direction from a periphery of eachpost 56 to a junction of twoadjacent sidewalls 54. A junction line of eachpost 56 and acorresponding connecting plate 58 is parallel to the axis of thepost 56. Each connectingplate 58 has a same height with thepost 56. - The conventional male mold, such as the
male mold 80 shown inFIG. 4 , may be adopted to cooperate with thefemale mold 80 of the present invention to mold thefan frame 11. Themale mold 80 is received in the inner space of thefemale mold 50. A gap resembling the shape of the fan frame is formed between themale mold 80 and thefemale mold 50. In molding thefan frame 11, molten plastic material is injected into the gap. After the molten plastic solidify to form thefan frame 11, themale mold 80 is withdrawn from thefemale mold 50. Then thefan frame 11 is removed from thefemale mold 50. - In the
fan frame 11 according to the present invention, theslits 19 allow thefan frame 11 adjacentcorresponding apertures 18 to resiliently deform to expand theapertures 18, therefore eliminate the stress concentration phenomena of the fan frame at theapertures 18. In the mold according to the present invention, eachpost 56 connects to the main part of thefemale mold 50 not only by its bottom end fixed to thebottom wall 52 of thefemale mold 50, but also by its periphery fixed to theconnecting plate 58 which is connected to thesidewalls 54. This arrangement greatly increases the joining force between thepost 56 and the main part of thefemale mold 50. Thepost 56 is thus able to withstand greater shock during transportation and radial force during molding process or machining of thepost 56 itself. - It is understood that the invention may be embodied in other forms without departing from the spirit thereof. The above-described examples and embodiments are to be considered in all respects as illustrative and not restrictive, and the invention is not to be limited to the details given above.
Claims (13)
1. A heat dissipation assembly comprising:
a fan frame defining an inner cavity, a plurality of circular through apertures around the inner cavity, a plurality of slits communicating with the through apertures to allow the through apertures to be resiliently expandable;
a blade set rotatably mounted in the inner cavity;
a support member supporting the fan frame thereon; and
a plurality of fasteners extending through the through apertures respectively and engaging with the support member so as to mount the fan frame on the support member.
2. The assembly as described in claim 1 , wherein the fan frame has a square outer periphery with the through apertures defined at corners thereof respectively.
3. The assembly as described in claim 1 , wherein the slits are in communication with an exterior of the fan frame thereby making the through apertures open outwardly.
4. The assembly as described in claim 1 , wherein the fasteners are screws.
5. The assembly as described in claim 1 , wherein the support member is a fan holder that is secure to a heat sink.
6. The assembly as described in claim 1 , wherein the support member is a heat sink.
7. The assembly as described in claim 1 , wherein the support member is a wall of a computer case.
8. A mold for making a fan frame, the mold comprising:
a male mold; and
a female mold comprising a main part having a bottom wall and a plurality of sidewalls extending from the bottom wall to cooperatively define an inner space therebetween for receiving the male mold therein, the male mold and the female mold cooperatively defining a gap resembling the shape of the fan frame therebetween, a plurality of posts having a same height extending perpendicularly from the bottom wall, a connecting plate connected between the main part and each of the posts.
9. The mold as described in claim 8 , wherein the connecting plate has a same height with the post.
10. The mold as described in claim 9 , wherein the connecting plate is connected to a junction of two adjacent sidewalls.
11. The mold as described in claim 8 , wherein the connecting plate is perpendicular to the bottom wall.
12. A fan for heat dissipation, comprising:
a blade set; and
a fan frame receiving said blade set so as to keep said blade set operatable therein, said fan frame having a plurality of through apertures disposed around said blade set, each of said through apertures extending through said fan frame to expose to outside of said fan frame at two opposing ends thereof, and at least one slit formed with said each of said through apertures to allow said each of said through apertures communicating with outside of said fan frame from a face of said each of said through apertures other than said two opposing ends.
13. The fan as described in claim 12 , wherein said each of said through apertures is resiliently extendable along a direction perpendicular to an extending direction of said at least one slit.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CNU200420044248XU CN2698566Y (en) | 2004-03-27 | 2004-03-27 | Mould for making fan frame |
CN200420044248.X | 2004-03-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050214142A1 true US20050214142A1 (en) | 2005-09-29 |
Family
ID=34775179
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/989,862 Abandoned US20050214142A1 (en) | 2004-03-27 | 2004-11-15 | Fan frame and mold for making the same |
Country Status (2)
Country | Link |
---|---|
US (1) | US20050214142A1 (en) |
CN (1) | CN2698566Y (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080189840A1 (en) * | 2007-02-09 | 2008-08-14 | Warren Francis Knoff | Thermal liner |
CN114654674A (en) * | 2022-04-05 | 2022-06-24 | 东台迈盛智能科技有限公司 | Aerogenerator blade mould of built-in rapid cooling mechanism |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5486980A (en) * | 1993-03-30 | 1996-01-23 | Thermalloy, Inc. | Method and apparatus for dissipating thermal energy |
US5677829A (en) * | 1995-06-07 | 1997-10-14 | Thermalloy, Inc. | Fan attachment clip for heat sink |
US6398492B1 (en) * | 1998-12-31 | 2002-06-04 | Halla Climate Control Corp. | Airflow guide stator vane for axial flow fan and shrouded axial flow fan assembly having such airflow guide stator vanes |
US6561762B1 (en) * | 2001-11-14 | 2003-05-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Housing structure of a fan |
US6640882B2 (en) * | 2001-07-31 | 2003-11-04 | Agilent Technologies, Inc. | Removable mounting clip attaches a motorized fan to an active heat sink and then the entire assembly to a part to be cooled |
US6654246B2 (en) * | 2002-03-29 | 2003-11-25 | Hon Hai Precision Ind. Co. Ltd. | Heat sink assembly with fixing members |
US6947281B2 (en) * | 2002-02-28 | 2005-09-20 | Sun Microsystems, Inc. | Cooling units |
-
2004
- 2004-03-27 CN CNU200420044248XU patent/CN2698566Y/en not_active Expired - Fee Related
- 2004-11-15 US US10/989,862 patent/US20050214142A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5486980A (en) * | 1993-03-30 | 1996-01-23 | Thermalloy, Inc. | Method and apparatus for dissipating thermal energy |
US5677829A (en) * | 1995-06-07 | 1997-10-14 | Thermalloy, Inc. | Fan attachment clip for heat sink |
US6398492B1 (en) * | 1998-12-31 | 2002-06-04 | Halla Climate Control Corp. | Airflow guide stator vane for axial flow fan and shrouded axial flow fan assembly having such airflow guide stator vanes |
US6640882B2 (en) * | 2001-07-31 | 2003-11-04 | Agilent Technologies, Inc. | Removable mounting clip attaches a motorized fan to an active heat sink and then the entire assembly to a part to be cooled |
US6561762B1 (en) * | 2001-11-14 | 2003-05-13 | Sunonwealth Electric Machine Industry Co., Ltd. | Housing structure of a fan |
US6947281B2 (en) * | 2002-02-28 | 2005-09-20 | Sun Microsystems, Inc. | Cooling units |
US6654246B2 (en) * | 2002-03-29 | 2003-11-25 | Hon Hai Precision Ind. Co. Ltd. | Heat sink assembly with fixing members |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080189840A1 (en) * | 2007-02-09 | 2008-08-14 | Warren Francis Knoff | Thermal liner |
CN114654674A (en) * | 2022-04-05 | 2022-06-24 | 东台迈盛智能科技有限公司 | Aerogenerator blade mould of built-in rapid cooling mechanism |
Also Published As
Publication number | Publication date |
---|---|
CN2698566Y (en) | 2005-05-11 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HON HAI PRECISION INDUSTRY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KU, CHIN-LONG;YEH, CHIN-WEN;REEL/FRAME:016000/0814 Effective date: 20041110 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |