US20090028710A1 - Fan blade - Google Patents
Fan blade Download PDFInfo
- Publication number
- US20090028710A1 US20090028710A1 US11/892,192 US89219207A US2009028710A1 US 20090028710 A1 US20090028710 A1 US 20090028710A1 US 89219207 A US89219207 A US 89219207A US 2009028710 A1 US2009028710 A1 US 2009028710A1
- Authority
- US
- United States
- Prior art keywords
- flow
- blade
- fan impeller
- guiding section
- air
- 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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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
- 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
Definitions
- the present invention relates to a fan impeller structure, and more particularly to a practical structure having flow-dividing and flow-guiding blades that improve the turbulence near the leeward side of the conventional blades to reduce air resistance and enhance air flow quantity and operating efficiency.
- a conventional fan impeller structure includes a hub 10 having a plurality of blades 11 arranged in a radial manner around the periphery of the hub 10 .
- the fan impeller is driven by a motor (not shown), the surrounding air is driven to form a flow field as a result of the rotation of the fan impeller.
- each blade 11 of the fan impeller has a windward surface 12 and a leeward surface 13 .
- air is pushed by the windward surface 12 of the blade 11 such that the pressure adjacent to the leeward surface 13 of the blade 11 is abruptly dropped to form a zone of negative pressure.
- the zone of negative pressure will suck in its surrounding air and is subjected to the thrust of the windward surface 12 of next blade 11 to form a cycle.
- the present invention thus provides a fan impeller structure that targets at solving the turbulence in the proximity of the leeward surfaces of the blades of the conventional fan impeller structure, thereby smoothening the flow field to reduce the air resistance and increase the air flow quantity.
- the fan impeller includes a hub having a plurality of blades stretched in a radial manner around the periphery of the hub, in which each blade has a windward surface and a leeward surface, at least one flow-guiding section is disposed on the leeward surface, and the flow-guiding section is preferably located near the end portion of the outer edge of the blade and is mounted in a direction which is parallel to the radial direction of the fan impeller, such that the leeward surface of the blade is divided into an upper portion and a lower portion by the flow-guiding section.
- FIG. 1 is a schematic top view showing a conventional fan impeller structure
- FIG. 2 is a schematic side view showing the conventional fan impeller structure
- FIG. 3 is a schematic flow field driven by the blade of the conventional fan impeller structure
- FIG. 4 is a schematic view showing the three-dimensional appearance of the present invention.
- FIG. 5 is a schematic top view of the present invention.
- FIG. 6 is a schematic side view of the present invention.
- FIG. 7 is a schematic view showing the flow field driven by the blades of the present invention.
- FIG. 8 is a schematic view showing the flow field driven by the blades of another preferred embodiment of the present invention.
- the fan impeller structure therein includes:
- each blade 21 has a windward surface 22 and a leeward surface 23 , and at least a flow-guiding section 24 is mounted on the leeward surface 23 and is preferably located near the end portion of the outer edge of the blade 21 and is mounted in parallel to a radial direction of the fan impeller such that the leeward surface 23 of the fan blade 21 is divided into an upper portion and a lower portion by the flow-guiding section.
- FIG. 6 and FIG. 7 When the fan impeller is driven by a motor (not shown), its surrounding air is driven to form a flow field due to the rotation of the fan impeller. After air is sucked in a zone of negative pressure in the proximity of the leeward surface of the blade, the air sucked in from the top and bottom sides of the blade 21 respectively, due to the flow-dividing and flow-guiding effect of the flow-guiding section 24 , flows in a way more closely attached the surface of the blade 21 , so as to avoid eddies and noises arising from mutual flow collision and counteraction at the same time.
- An arc-like flow-guiding angle is designed on the flow-guiding section 25 and over the intersection of the flow-guiding section 25 and a blade 21 respectively, making air flow in a way more easily attached to the surface of the blade 21 to prevent the occurrence of small turbulence.
Abstract
The present invention relates to a fan impeller structure, which includes a hub having a plurality of blades distributed around the periphery of the hub in a radial manner. The blade has a windward surface and a leeward surface; at least a flow-guiding section is disposed on the leeward surface and is preferably located near the end portion of the outer edge of the blade and is mounted in parallel to the radial direction of the fan impeller. Therefore, when air is sucked in from the top and bottom sides of the blade respectively, the heat-dissipation performance loss resulting from the mutual collision of the air flow is avoided due to the flow-dividing and flow-guiding effect of the flow-guiding section.
Description
- The present invention relates to a fan impeller structure, and more particularly to a practical structure having flow-dividing and flow-guiding blades that improve the turbulence near the leeward side of the conventional blades to reduce air resistance and enhance air flow quantity and operating efficiency.
- As shown in
FIG. 1 andFIG. 2 , a conventional fan impeller structure includes ahub 10 having a plurality ofblades 11 arranged in a radial manner around the periphery of thehub 10. When the fan impeller is driven by a motor (not shown), the surrounding air is driven to form a flow field as a result of the rotation of the fan impeller. - Together with the illustration of
FIG. 2 andFIG. 3 , eachblade 11 of the fan impeller has awindward surface 12 and aleeward surface 13. When the fan impeller rotates, air is pushed by thewindward surface 12 of theblade 11 such that the pressure adjacent to theleeward surface 13 of theblade 11 is abruptly dropped to form a zone of negative pressure. To achieve the pressure balance, the zone of negative pressure will suck in its surrounding air and is subjected to the thrust of thewindward surface 12 ofnext blade 11 to form a cycle. - Whereas, after the zone of negative pressure of the aforementioned fan impeller sucks in its surrounding air, the air sucked in from the top and bottom sides of the
blade 11 respectively will meet at the end portion of theleeward surface 13 to form aturbulence zone 14, and due to continuous collision and counterbalancing effect the air flow inside theturbulence zone 14 results in eddies and noises which lowers the air flow quantity and affects the heat-dissipation performance. - In view of the foregoing concern, the present invention thus provides a fan impeller structure that targets at solving the turbulence in the proximity of the leeward surfaces of the blades of the conventional fan impeller structure, thereby smoothening the flow field to reduce the air resistance and increase the air flow quantity.
- The fan impeller includes a hub having a plurality of blades stretched in a radial manner around the periphery of the hub, in which each blade has a windward surface and a leeward surface, at least one flow-guiding section is disposed on the leeward surface, and the flow-guiding section is preferably located near the end portion of the outer edge of the blade and is mounted in a direction which is parallel to the radial direction of the fan impeller, such that the leeward surface of the blade is divided into an upper portion and a lower portion by the flow-guiding section.
- Consequently, when air is sucked in from the top and bottom sides of the blade respectively, eddies, noises and efficacy loss resulting from mutual collision and counteraction of air flow can be avoided due to the flow-dividing and flow-guiding functions of the flow-guiding section, and the wind shear acted on the blade is alleviated, so as to enhance the stability and achieve the optimized heat-dissipation effect.
-
FIG. 1 is a schematic top view showing a conventional fan impeller structure; -
FIG. 2 is a schematic side view showing the conventional fan impeller structure; -
FIG. 3 is a schematic flow field driven by the blade of the conventional fan impeller structure; -
FIG. 4 is a schematic view showing the three-dimensional appearance of the present invention; -
FIG. 5 is a schematic top view of the present invention; -
FIG. 6 is a schematic side view of the present invention; -
FIG. 7 is a schematic view showing the flow field driven by the blades of the present invention; and -
FIG. 8 is a schematic view showing the flow field driven by the blades of another preferred embodiment of the present invention. - To make the object, features and efficacy of the present invention more comprehensive, preferred embodiments of the present invention are enumerated along with the detailed illustrative description.
- Please also refer to
FIG. 4 andFIG. 5 . The fan impeller structure therein includes: - a
hub 20 having a plurality ofblades 21 distributed in a radial manner around the periphery of thehub 20, in which theblades 21 are selected from either type of axial-flow blade or blower blade (the one shown inFIG. 4 andFIG. 5 pertains to a blower blade), eachblade 21 has awindward surface 22 and aleeward surface 23, and at least a flow-guidingsection 24 is mounted on theleeward surface 23 and is preferably located near the end portion of the outer edge of theblade 21 and is mounted in parallel to a radial direction of the fan impeller such that theleeward surface 23 of thefan blade 21 is divided into an upper portion and a lower portion by the flow-guiding section. - Further refer to
FIG. 6 andFIG. 7 . When the fan impeller is driven by a motor (not shown), its surrounding air is driven to form a flow field due to the rotation of the fan impeller. After air is sucked in a zone of negative pressure in the proximity of the leeward surface of the blade, the air sucked in from the top and bottom sides of theblade 21 respectively, due to the flow-dividing and flow-guiding effect of the flow-guidingsection 24, flows in a way more closely attached the surface of theblade 21, so as to avoid eddies and noises arising from mutual flow collision and counteraction at the same time. - Moreover, when air is closely flowing along the surface of the
blade 21, on the one hand, it will generate an thrust on theblade 21, and on the other hand, it can alleviate the wind shear effect acted on theblade 21 to enhance its stability, thereby providing the optimized heat-dissipation performance. - Besides, please refer to
FIG. 8 . An arc-like flow-guiding angle is designed on the flow-guidingsection 25 and over the intersection of the flow-guidingsection 25 and ablade 21 respectively, making air flow in a way more easily attached to the surface of theblade 21 to prevent the occurrence of small turbulence. - In sum, by means of the design of the flow-guiding
section 24 on theleeward surface 23 of theblade 21 of the fan impeller in the present invention, the mutual collision and counteraction of the air sucked in from the top and bottom sides of theblade 21 respectively can be avoided due to the flow-dividing and flow-guiding effect of the flow-guidingsection 24, so as to maintain the normal air flow quantity and the heat-dissipation performance of the blade. From the above-mentioned characteristics those features not only have a novelty among similar products and a progressiveness but also have an industry utility. - While the invention has been described in terms of what is presently considered to be the most practical and preferred embodiments, it is to be understood that the invention needs not be limited to the disclosed embodiments. On the contrary, it is intended to cover various modifications and similar arrangements included within the spirit and scope of the appended claims, which are to be accorded with the broadest interpretation so as to encompass all such modifications and similar structures.
Claims (4)
1. A fan impeller structure, comprising:
a hub;
a plurality of blades disposed in a radial manner around a periphery of said hub;
a windward surface and leeward surface located on each said blade; and
at least one flow-guiding section disposed on said leeward surface.
2. The fan impeller structure of claim 1 , wherein said at least one flow-guiding section is located near an end portion of an outer edge of said blade and is mounted in parallel to a radial direction of said fan impeller to divide said leeward surface of said blade into an upper portion and a lower portion.
3. The fan impeller structure of claim 1 , wherein an arc-like flow-guiding angle is formed on said flow-guiding section and over an intersection of said flow-guiding section and said blade respectively.
4. The fan impeller structure of claim 1 , wherein said blade is selected from one type of axial-flow blade and blower blade.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW096127255A TW200905084A (en) | 2007-07-26 | 2007-07-26 | Fan impeller structure |
TW096127255 | 2007-07-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20090028710A1 true US20090028710A1 (en) | 2009-01-29 |
Family
ID=40295523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/892,192 Abandoned US20090028710A1 (en) | 2007-07-26 | 2007-08-21 | Fan blade |
Country Status (2)
Country | Link |
---|---|
US (1) | US20090028710A1 (en) |
TW (1) | TW200905084A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110064570A1 (en) * | 2009-09-16 | 2011-03-17 | O'connor John F | High Efficiency Low-Profile Centrifugal Fan |
CN105003462A (en) * | 2015-09-01 | 2015-10-28 | 吉首大学 | Dirt retention-preventing bifurcated fan impeller with inverted water drop-shaped blades |
US20160310013A1 (en) * | 2011-07-25 | 2016-10-27 | Cheetah Medical, Inc. | Method and system for monitoring hemodynamics |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113775542A (en) * | 2020-06-10 | 2021-12-10 | 英业达科技有限公司 | Fan impeller |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1536306A (en) * | 1924-02-06 | 1925-05-05 | Ingersoll Rand Co | Radial impeller |
US20020159885A1 (en) * | 2001-04-27 | 2002-10-31 | Te Liang | Heat dissipating fan |
US20030017048A1 (en) * | 2001-07-17 | 2003-01-23 | Lin Pao Lung | Structure of a fan |
US20030063976A1 (en) * | 2001-09-28 | 2003-04-03 | Sunonwealth Electric Machine Industry Co., Ltd. | Impeller structure |
US7713030B2 (en) * | 2005-12-12 | 2010-05-11 | International Business Machines Corporation | Fan with improved heat dissipation |
-
2007
- 2007-07-26 TW TW096127255A patent/TW200905084A/en not_active IP Right Cessation
- 2007-08-21 US US11/892,192 patent/US20090028710A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1536306A (en) * | 1924-02-06 | 1925-05-05 | Ingersoll Rand Co | Radial impeller |
US20020159885A1 (en) * | 2001-04-27 | 2002-10-31 | Te Liang | Heat dissipating fan |
US20030017048A1 (en) * | 2001-07-17 | 2003-01-23 | Lin Pao Lung | Structure of a fan |
US20030063976A1 (en) * | 2001-09-28 | 2003-04-03 | Sunonwealth Electric Machine Industry Co., Ltd. | Impeller structure |
US7713030B2 (en) * | 2005-12-12 | 2010-05-11 | International Business Machines Corporation | Fan with improved heat dissipation |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110064570A1 (en) * | 2009-09-16 | 2011-03-17 | O'connor John F | High Efficiency Low-Profile Centrifugal Fan |
EP2336573A2 (en) | 2009-09-16 | 2011-06-22 | The Bergquist-Torrington Company | High efficiency low-profile centrifugal fan |
US8647051B2 (en) | 2009-09-16 | 2014-02-11 | The Bergquist Torrington Company | High efficiency low-profile centrifugal fan |
US20160310013A1 (en) * | 2011-07-25 | 2016-10-27 | Cheetah Medical, Inc. | Method and system for monitoring hemodynamics |
US20160310016A1 (en) * | 2011-07-25 | 2016-10-27 | Cheetah Medical, Inc. | Method and system for monitoring hemodynamics |
US20160310014A1 (en) * | 2011-07-25 | 2016-10-27 | Cheetah Medical, Inc. | Method and system for monitoring hemodynamics |
CN105003462A (en) * | 2015-09-01 | 2015-10-28 | 吉首大学 | Dirt retention-preventing bifurcated fan impeller with inverted water drop-shaped blades |
Also Published As
Publication number | Publication date |
---|---|
TWI334903B (en) | 2010-12-21 |
TW200905084A (en) | 2009-02-01 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: SUNONWEALTH ELECTRIC MACHINE INDUSTTRY CO., LTD., Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:HORNG, ALEX;LI, MING-TSUNG;REEL/FRAME:019782/0187 Effective date: 20070810 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |