US20090169389A1 - Impeller and cooling fan using the same - Google Patents
Impeller and cooling fan using the same Download PDFInfo
- Publication number
- US20090169389A1 US20090169389A1 US11/964,923 US96492307A US2009169389A1 US 20090169389 A1 US20090169389 A1 US 20090169389A1 US 96492307 A US96492307 A US 96492307A US 2009169389 A1 US2009169389 A1 US 2009169389A1
- Authority
- US
- United States
- Prior art keywords
- impeller
- tip portion
- windward
- leeward
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
-
- 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
- F04D29/26—Rotors specially for elastic fluids
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/30—Vanes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2240/00—Components
- F05D2240/20—Rotors
- F05D2240/30—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor
- F05D2240/304—Characteristics of rotor blades, i.e. of any element transforming dynamic fluid energy to or from rotational energy and being attached to a rotor related to the trailing edge of a rotor blade
Definitions
- the present invention relates to impellers and cooling fans using the same, and more particularly to an impeller which can generate more airflow with a low level of noise.
- a cooling fan is used to produce an airflow which can remove heat from the electronic component.
- the cooling fan comprises a stator and an impeller being rotatable with respective to the stator.
- the impeller further comprises a hub and a plurality of blades radially and outwardly extending from the hub. In use, the blades of the impeller rotate around the stator to drive the airflow to flow towards the electronic component, thus cooling the electronic component continuously.
- Increasing a revolving speed of the impeller relatively increases the amount of airflow, therefore a heat dissipation efficiency is relatively improved.
- increasing the revolving speed may correspondingly cause a rise of a noise level generated by the cooling fan, thus making a user near the fan feel uncomfortable.
- the present invention in one aspect, provides an impeller which generates more airflow without generating more noise.
- the impeller includes a hub, and a plurality of blades radially extending from the hub.
- Each of the blades includes a windward surface and a leeward surface which has a different configuration with the windward surface.
- the windward surface has a tip portion selected from a group consisting of forward curved surface and planar surface.
- the leeward surface has a tip portion selected from a group consisting of planar surface and backward curved surface.
- the present invention in another aspect, provides a cooling fan using the impeller.
- the cooling fan includes a bottom housing, a top cover covering the bottom housing, and impeller and stator accommodated in a space formed between the bottom housing and the top cover.
- the impeller includes a hub, and a plurality of blades radially extending from the hub. Each of the blades includes a windward surface and a leeward surface which has a different configuration with the windward surface.
- the windward surface has a tip portion selected from a group consisting of forward curved surface and planar surface.
- the leeward surface has a tip portion selected from a group consisting of planar surface and backward curved surface.
- FIG. 1 is an exploded, isometric view of a cooling fan according to a preferred embodiment of the present invention.
- FIG. 2 is a top view of an impeller of the cooling fan of FIG. 1 .
- FIG. 3 is a top view of an impeller according to a second embodiment of the present invention.
- FIG. 4 is a top view of an impeller according to a third embodiment of the present invention.
- the cooling fan 10 includes a bottom housing 12 , a top cover 14 covering the bottom housing 12 , and an impeller 16 and a stator (not shown) accommodated in a space formed between the bottom housing 12 and the top cover 14 .
- the impeller 16 includes a hub 162 and a plurality of blades 164 radially and outwardly extending from the hub 162 .
- An air channel 122 is formed between free ends of the blades 164 and an inner surface of a sidewall of the bottom housing 12 of the cooling fan 10 .
- the impeller 16 rotates in the bottom housing 12 along a counterclockwise direction and drives an airflow to flow towards an air outlet 124 of the cooling fan 10 .
- each of the blades 164 includes a windward surface 164 a and a leeward surface 164 b which confronts the windward surface 164 a of a neighboring blade 164 .
- the windward surface 164 a has a tip portion 1641 which is a forward curved surface.
- An extension direction of the tip portion 1641 of the windward surface 164 a confronts to the rotation direction of the impeller 16 .
- the leeward surface 164 b has a tip portion 1642 which is a planar surface.
- the tip portions 1641 , 1642 of the windward and leeward surfaces 164 a, 164 b of the blades 164 of the impeller 16 are respectively to be forward curved surfaces and planar surfaces.
- the present impeller 16 generates more airflow than an impeller whose windward and leeward surfaces have planar tip portions, and generates less noise than an impeller whose windward and leeward surfaces have forward curved tip portions. Therefore, the windward surfaces 164 a impel more air to flow towards the air outlet 124 of the impeller 16 , and the leeward surfaces 164 b decrease noises generated during operation of the impeller 16 .
- the present impeller 16 is optimized to generate more airflow without generating more noise.
- the tip portion 2641 of the windward surface 264 a of the blade 264 is a planar surface
- the tip portion 2642 of the leeward surface 264 b of the blade 264 is a backward curved surface.
- Planar surfaces can generate more airflow than backward curved surfaces and generate less noise than forward curved surfaces. Therefore, the present impeller 26 can generate more airflow than an impeller whose windward and leeward surfaces have backward curved tip portions, and generate less noise than an impeller whose windward and leeward surfaces have planar tip portions.
- the present impeller 26 is optimized to generate more airflow without generating more noise.
- the tip portion 3641 of the windward surface 364 a of the blade 364 is a forward curved surface
- the tip portion 3642 of the leeward surface 364 b of the blade 364 is a backward curved surface. Therefore, the present impeller 36 can generate more airflow than an impeller whose windward and leeward surfaces have backward curved tip portions or planar tip portions, and generate less noise than an impeller whose windward and leeward surfaces have forward curved tip portions.
- the present impeller 36 is optimized to generate more airflow without generating more noise.
- the tip portions 1641 , 2641 , 3641 of the windward surfaces 164 a, 264 a, 364 a and the tip portions 1642 , 2642 , 3642 of the leeward surfaces 164 b, 264 b, 364 b of the blades 164 , 264 , 364 of the impeller 16 , 26 , 36 are different types of surfaces which have different capabilities in driving airflow and decreasing noise. Therefore, the present impeller 16 , 26 , 36 can be optimized to generate more airflow without generating more noise.
Abstract
Description
- 1. Technical Field
- The present invention relates to impellers and cooling fans using the same, and more particularly to an impeller which can generate more airflow with a low level of noise.
- 2. Description of Related Art
- With continuing development of the electronic technology, electronic components such as CPUs generate more and more heat which is required to be dissipated immediately.
- Conventionally, a cooling fan is used to produce an airflow which can remove heat from the electronic component. The cooling fan comprises a stator and an impeller being rotatable with respective to the stator. The impeller further comprises a hub and a plurality of blades radially and outwardly extending from the hub. In use, the blades of the impeller rotate around the stator to drive the airflow to flow towards the electronic component, thus cooling the electronic component continuously.
- Increasing a revolving speed of the impeller relatively increases the amount of airflow, therefore a heat dissipation efficiency is relatively improved. However, increasing the revolving speed may correspondingly cause a rise of a noise level generated by the cooling fan, thus making a user near the fan feel uncomfortable.
- What is needed, therefore, is an impeller which can overcome the above-mentioned disadvantage.
- The present invention, in one aspect, provides an impeller which generates more airflow without generating more noise. The impeller includes a hub, and a plurality of blades radially extending from the hub. Each of the blades includes a windward surface and a leeward surface which has a different configuration with the windward surface. The windward surface has a tip portion selected from a group consisting of forward curved surface and planar surface. The leeward surface has a tip portion selected from a group consisting of planar surface and backward curved surface.
- The present invention, in another aspect, provides a cooling fan using the impeller. The cooling fan includes a bottom housing, a top cover covering the bottom housing, and impeller and stator accommodated in a space formed between the bottom housing and the top cover. The impeller includes a hub, and a plurality of blades radially extending from the hub. Each of the blades includes a windward surface and a leeward surface which has a different configuration with the windward surface. The windward surface has a tip portion selected from a group consisting of forward curved surface and planar surface. The leeward surface has a tip portion selected from a group consisting of planar surface and backward curved surface.
- Other advantages and novel features of the present impeller and cooling fan will become more apparent from the following detailed description of preferred embodiments when taken in conjunction with the accompanying drawings, in which:
-
FIG. 1 is an exploded, isometric view of a cooling fan according to a preferred embodiment of the present invention. -
FIG. 2 is a top view of an impeller of the cooling fan ofFIG. 1 . -
FIG. 3 is a top view of an impeller according to a second embodiment of the present invention. -
FIG. 4 is a top view of an impeller according to a third embodiment of the present invention. - Reference will now be made to the drawing figures to describe the preferred embodiment in detail.
- Referring to
FIG. 1 , thecooling fan 10 includes abottom housing 12, atop cover 14 covering thebottom housing 12, and animpeller 16 and a stator (not shown) accommodated in a space formed between thebottom housing 12 and thetop cover 14. - The
impeller 16 includes ahub 162 and a plurality ofblades 164 radially and outwardly extending from thehub 162. Anair channel 122 is formed between free ends of theblades 164 and an inner surface of a sidewall of thebottom housing 12 of thecooling fan 10. In operation of thecooling fan 10, theimpeller 16 rotates in thebottom housing 12 along a counterclockwise direction and drives an airflow to flow towards anair outlet 124 of thecooling fan 10. - Referring to
FIG. 2 , each of theblades 164 includes awindward surface 164 a and aleeward surface 164 b which confronts thewindward surface 164 a of a neighboringblade 164. Thewindward surface 164 a has atip portion 1641 which is a forward curved surface. An extension direction of thetip portion 1641 of thewindward surface 164 a confronts to the rotation direction of theimpeller 16. Theleeward surface 164 b has atip portion 1642 which is a planar surface. - In the
present impeller 16, thetip portions leeward surfaces blades 164 of theimpeller 16 are respectively to be forward curved surfaces and planar surfaces. Thepresent impeller 16 generates more airflow than an impeller whose windward and leeward surfaces have planar tip portions, and generates less noise than an impeller whose windward and leeward surfaces have forward curved tip portions. Therefore, thewindward surfaces 164 a impel more air to flow towards theair outlet 124 of theimpeller 16, and theleeward surfaces 164 b decrease noises generated during operation of theimpeller 16. Thus, thepresent impeller 16 is optimized to generate more airflow without generating more noise. - Referring to
FIG. 3 , a second embodiment of thepresent impeller 26 is shown. In this embodiment, thetip portion 2641 of the windward surface 264 a of theblade 264 is a planar surface, and thetip portion 2642 of theleeward surface 264 b of theblade 264 is a backward curved surface. Planar surfaces can generate more airflow than backward curved surfaces and generate less noise than forward curved surfaces. Therefore, thepresent impeller 26 can generate more airflow than an impeller whose windward and leeward surfaces have backward curved tip portions, and generate less noise than an impeller whose windward and leeward surfaces have planar tip portions. Thepresent impeller 26 is optimized to generate more airflow without generating more noise. - Referring to
FIG. 4 , a third embodiment of thepresent impeller 36 is shown. In this embodiment, thetip portion 3641 of thewindward surface 364 a of theblade 364 is a forward curved surface, whilst thetip portion 3642 of theleeward surface 364 b of theblade 364 is a backward curved surface. Therefore, thepresent impeller 36 can generate more airflow than an impeller whose windward and leeward surfaces have backward curved tip portions or planar tip portions, and generate less noise than an impeller whose windward and leeward surfaces have forward curved tip portions. Thepresent impeller 36 is optimized to generate more airflow without generating more noise. - In the hereinabove embodiments of the
present impeller tip portions windward surfaces tip portions leeward surfaces blades impeller present impeller - It is to be understood, how ever, that even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and function of the invention, 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 (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/964,923 US20090169389A1 (en) | 2007-12-27 | 2007-12-27 | Impeller and cooling fan using the same |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/964,923 US20090169389A1 (en) | 2007-12-27 | 2007-12-27 | Impeller and cooling fan using the same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090169389A1 true US20090169389A1 (en) | 2009-07-02 |
Family
ID=40798675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/964,923 Abandoned US20090169389A1 (en) | 2007-12-27 | 2007-12-27 | Impeller and cooling fan using the same |
Country Status (1)
Country | Link |
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US (1) | US20090169389A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140079541A1 (en) * | 2012-09-18 | 2014-03-20 | Asustek Computer Inc. | Electronic device |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2083996A (en) * | 1935-02-02 | 1937-06-15 | Breuer Electric Mfg Co | Centrifugal fan |
US6254342B1 (en) * | 1998-01-08 | 2001-07-03 | Matsushita Electric Industrial Co., Ltd. | Air supplying device |
US20020114698A1 (en) * | 2001-02-19 | 2002-08-22 | Japan Servo Co., Ltd. | Axial flow fan |
US6699016B1 (en) * | 2001-06-12 | 2004-03-02 | Peter Dean | Boat propeller |
-
2007
- 2007-12-27 US US11/964,923 patent/US20090169389A1/en not_active Abandoned
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2083996A (en) * | 1935-02-02 | 1937-06-15 | Breuer Electric Mfg Co | Centrifugal fan |
US6254342B1 (en) * | 1998-01-08 | 2001-07-03 | Matsushita Electric Industrial Co., Ltd. | Air supplying device |
US20020114698A1 (en) * | 2001-02-19 | 2002-08-22 | Japan Servo Co., Ltd. | Axial flow fan |
US6699016B1 (en) * | 2001-06-12 | 2004-03-02 | Peter Dean | Boat propeller |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20140079541A1 (en) * | 2012-09-18 | 2014-03-20 | Asustek Computer Inc. | Electronic device |
US9416793B2 (en) * | 2012-09-18 | 2016-08-16 | Asustek Computer Inc. | Electronic device |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: FU ZHUN PRECISION INDUSTRY (SHEN ZHEN) CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HWANG, CHING-BAI;ZHAO, ZHI-HUI;LIN, RAN;REEL/FRAME:020292/0950 Effective date: 20071225 Owner name: FOXCONN TECHNOLOGY CO., LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HWANG, CHING-BAI;ZHAO, ZHI-HUI;LIN, RAN;REEL/FRAME:020292/0950 Effective date: 20071225 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |