US20130202443A1 - Axial flow device - Google Patents
Axial flow device Download PDFInfo
- Publication number
- US20130202443A1 US20130202443A1 US13/367,374 US201213367374A US2013202443A1 US 20130202443 A1 US20130202443 A1 US 20130202443A1 US 201213367374 A US201213367374 A US 201213367374A US 2013202443 A1 US2013202443 A1 US 2013202443A1
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- United States
- Prior art keywords
- axial flow
- attack
- angle
- flow device
- blade
- 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
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003068 static effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 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
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/38—Blades
- F04D29/384—Blades characterised by form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/12—Blades
- F01D5/14—Form or construction
- F01D5/141—Shape, i.e. outer, aerodynamic form
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/34—Rotor-blade aggregates of unitary construction, e.g. formed of sheet laminae
-
- 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
- F05D2240/303—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 leading edge of a rotor blade
Definitions
- the present invention relates to an axial flow device, and in particular, to an axial flow device of which the blades each having a continuous angle of attack variation, in which the angle of attack of the tip portion is greater than the angle of attack of the root portion.
- FIG. 1 is a cross-sectional view of a blade of a conventional axial flow device
- the angle of attack of each blade is maintained the same from the root portion to the tip portion, and therefore there is no angle of attack variation between the root portion and the tip portion.
- FIG. 2A and FIG. 2B which are cross-sectional views of the root portion and the tip portion respectively of a blade of another conventional axial flow device
- the angle of attack ⁇ 2 of the tip portion is less than the angle of attack ⁇ 1 of the root portion.
- the main purpose of an axial flow device is to overcome resistance while transporting fluid from one point to another, and therefore the key issue is how to provide higher static pressure to overcome resistance so as to increase flow rate.
- both the foregoing blade designs are insufficient to provide higher flow rate while working, and therefore it is usually to increase the revolving speed of the axial flow device or using larger blades for increasing flow rate.
- Increasing the revolving speed of an axial flow device relatively increases the flow rate thereof, but it will cause the device to be damaged much faster resulting in a shorter service life. Keeping the blades in balance is another important factor to be taken into account when increasing the revolving speed in order to increase the flow rate. If the blades of the axial flow device are not arranged in balance, the blades will vibrate when starting the axial flow device, affecting the axial flow device quality and its service life. Therefore, it is not a good measure to increase flow rate simply by increasing the revolving speed. Further, increasing the revolving speed also results in waste of power and increase of heat. On the other hand, using larger blades for increasing flow rate is not a good idea as well.
- An object of this invention is to provide an axial flow device for providing higher static pressure to overcome resistance so as to achieve higher flow rate and improve efficiency of the axial flow device for reducing energy consumption without increasing the fabricating process complexity and manufacturing cost.
- the axial flow device of the present invention includes a hub having an outer periphery and a plurality of blades each having a root portion, a tip portion and a body portion between the root portion and the tip portion and projecting outward from the outer periphery of the hub.
- the root portion has a first angle of attack substantially in a range of 27 degrees to 45 degrees
- the tip portion has a second angle of attack substantially in a range of 37 degrees to 55 degrees
- the second angle of attack is greater than the first angle of attack.
- each blade is integrally formed based on a continuous angle of attack variation from the root portion through the body portion to the tip portion, in which the continuous angle of attack variation is substantially in a range of 27 degrees to 55 degrees.
- FIG. 1 is a cross-sectional view of a blade of a conventional axial flow device.
- FIG. 2A is a cross-sectional view of the root portion of a blade of another conventional axial flow device.
- FIG. 2B is a cross-sectional view of the tip portion of the blade shown in FIG. 2A .
- FIG. 3 is a perspective view of the axial flow device according to one preferred embodiment of the present invention.
- FIG. 4 is a top view of the axial flow device shown in FIG. 3 .
- FIG. 5 is a side view of the axial flow device shown in FIG. 3 .
- FIG. 6A is a cross-sectional view along line A-A shown in FIG. 4 .
- FIG. 6B is a cross-sectional view along line B-B shown in FIG. 4 .
- FIG. 7 is a diagram illustrating the angle of attack variation distribution of each blade of the axial flow device according to one embodiment of the present invention.
- FIG. 8A illustrates a blade with a straight planform.
- FIG. 8B illustrates a blade which is forwardly skewed.
- FIG. 8C illustrates a blade which is backwardly skewed.
- FIG. 8D illustrates a blade which is backwardly skewed in the region adjacent to the root portion and forwardly skewed in the region adjacent to the tip portion.
- FIG. 8E illustrates a blade which is forwardly skewed in the region adjacent to the root portion and backwardly skewed in the region adjacent to the tip portion.
- FIG. 9 illustrates a frame of the axial flow device according to the present invention.
- FIG. 10 is a diagram showing the characteristic curves of the axial flow device according to the present invention and the conventional axial flow device shown in FIG. 2A and FIG. 2B .
- An axial flow device 3 in one preferred embodiment of the present invention such as an axial flow fan or pump, includes a hub 31 having an outer periphery 311 and a plurality of blades 33 , in which each blade has a root portion 331 , a tip portion 335 and a body portion 333 between the root portion 331 and the tip portion 335 , and projects outward from the outer periphery 311 of the hub 31 . Furthermore, the root portion 331 has a first angle of attack ⁇ 1 substantially in a range of 27 degrees to 45 degrees as shown in FIG.
- the tip portion 335 has a second angle of attack ⁇ 2 substantially in a range of 37 degrees to 55 degrees as shown in FIG. 6B , and the second angle of attack ⁇ 2 is greater than the first angle of attack ⁇ 1 .
- each blade 33 is integrally formed based on a continuous angle of attack variation from the root portion 331 through the body portion 333 to the tip portion 335 , in which the continuous angle of attack variation is substantially in a range of 27 degrees to 55 degrees, and the angle difference ⁇ between the second angle of attack ⁇ 2 and the first angle of attack ⁇ 1 , which means ⁇ is equal to ⁇ 2 minus ⁇ 1 , is substantially in a range of 6 degrees to 28 degrees.
- FIG. 7 is a diagram illustrating the angle of attack variation distribution of each blade 33 of the axial flow device 3 according to one embodiment of the present invention, in which point O illustrates the angle of attack of the root portion 331 and point T illustrates the angle of attack of the tip portion 335 .
- the angle of attack uniformly varies from the root portion 331 through the body portion 333 to the tip portion 335 , in which the angle of attack of the tip portion 335 is greater than the angle of attack of the root portion 331 and the angle of attack increases gradually from the root portion 331 to the tip portion 335 .
- example 2 which is described by an increasing function of which the graph opens up as shown in FIG.
- the varying rate of the angle of attack increases from the root portion 331 through the body portion 333 to the tip portion 335 , in which the angle of attack of the tip portion 335 is greater than the angle of attack of the root portion 331 .
- the varying rate of the angle of attack decreases from the root portion 331 through the body portion 333 to the tip portion 335 , in which the angle of attack of the tip portion 335 is greater than the angle of attack of the root portion 331 .
- FIGS. 8A-8E illustrate several blade designs according to different aspects of the present invention.
- the blades 33 are “unskewed”: each blade 33 has a straight planform in which a radial center line of the blade 33 is straight and the blade chords perpendicular to the radial center line are uniformly distributed about the line.
- each blade 33 is forwardly skewed: the blade center line curves in the direction of rotation D of the axial flow device 3 .
- FIG. 8C each blade 33 is backwardly skewed: the blade center line curves away from the direction of rotation D of the axial flow device 3 .
- FIG. 8A the blades 33 are “unskewed”: each blade 33 has a straight planform in which a radial center line of the blade 33 is straight and the blade chords perpendicular to the radial center line are uniformly distributed about the line.
- each blade 33 is forwardly skewed: the blade center line curves in the direction of rotation D of the axial flow device 3
- each blade 33 is backwardly skewed in the region adjacent to the root portion 331 and forwardly skewed in the region adjacent to the tip portion 335 .
- each blade 33 is forwardly skewed in the region adjacent to the root portion 331 and backwardly skewed in the region adjacent to the tip portion 335 .
- the axial flow device 3 further includes a frame 4 , in which the plurality of blades 33 project outward radially from the outer periphery 311 of the hub 31 toward the frame 4 .
- FIG. 10 The effect of the present invention has been verified in experiments and the results of which are shown in FIG. 10 , in which an axial flow device according to the present invention is compared with a conventional axial flow device shown in FIG. 2A and FIG. 2B .
- the axial flow device according to the present invention attains higher static pressure, higher flow rate and overall better performance.
- the characteristic curve of the conventional axial flow device as shown in FIG.
- the instability region in the operational area 5 is significantly decreased as shown in FIG. 10 and thus it makes the axial flow device more efficient and attains higher flow rate at same static pressure compared with the conventional axial flow device. Accordingly, the axial flow device according to the present invention provides higher static pressure in operational area 5 to overcome resistance so as to achieve higher flow rate and improve efficiency of the axial flow device for reducing energy consumption without increasing the fabricating process complexity and manufacturing cost.
Abstract
An axial flow device includes a hub having an outer periphery and a plurality of blades each having a root portion, a tip portion and a body portion between the root portion and the tip portion and projecting outward from the outer periphery of the hub. Furthermore, the root portion has a first angle of attack, the tip portion has a second angle of attack, and the second angle of attack is greater than the first angle of attack. Specifically, each blade is integrally formed based on a continuous angle of attack variation from the root portion through the body portion to the tip portion.
Description
- The present invention relates to an axial flow device, and in particular, to an axial flow device of which the blades each having a continuous angle of attack variation, in which the angle of attack of the tip portion is greater than the angle of attack of the root portion.
- Traditionally, blade design of conventional axial flow devices, such as axial flow fans or pumps, can be roughly classified into two kinds as shown in
FIG. 1 ,FIG. 2A andFIG. 2B . In the first kind of blade design as shown inFIG. 1 , which is a cross-sectional view of a blade of a conventional axial flow device, the angle of attack of each blade is maintained the same from the root portion to the tip portion, and therefore there is no angle of attack variation between the root portion and the tip portion. In the second kind of blade design as shown inFIG. 2A andFIG. 2B , which are cross-sectional views of the root portion and the tip portion respectively of a blade of another conventional axial flow device, the angle of attack β2 of the tip portion is less than the angle of attack β1 of the root portion. - The main purpose of an axial flow device is to overcome resistance while transporting fluid from one point to another, and therefore the key issue is how to provide higher static pressure to overcome resistance so as to increase flow rate. However, both the foregoing blade designs are insufficient to provide higher flow rate while working, and therefore it is usually to increase the revolving speed of the axial flow device or using larger blades for increasing flow rate.
- Increasing the revolving speed of an axial flow device relatively increases the flow rate thereof, but it will cause the device to be damaged much faster resulting in a shorter service life. Keeping the blades in balance is another important factor to be taken into account when increasing the revolving speed in order to increase the flow rate. If the blades of the axial flow device are not arranged in balance, the blades will vibrate when starting the axial flow device, affecting the axial flow device quality and its service life. Therefore, it is not a good measure to increase flow rate simply by increasing the revolving speed. Further, increasing the revolving speed also results in waste of power and increase of heat. On the other hand, using larger blades for increasing flow rate is not a good idea as well. Larger blades result in higher manufacturing cost and cause larger size of an axial flow device, which is not practical in industrial applicability. Therefore, there is a need to achieve higher flow rate and improve efficiency of an axial flow device for reducing energy consumption without increasing the fabricating process complexity and manufacturing cost.
- An object of this invention is to provide an axial flow device for providing higher static pressure to overcome resistance so as to achieve higher flow rate and improve efficiency of the axial flow device for reducing energy consumption without increasing the fabricating process complexity and manufacturing cost.
- To solve the foregoing problem, the axial flow device of the present invention includes a hub having an outer periphery and a plurality of blades each having a root portion, a tip portion and a body portion between the root portion and the tip portion and projecting outward from the outer periphery of the hub. Furthermore, the root portion has a first angle of attack substantially in a range of 27 degrees to 45 degrees, the tip portion has a second angle of attack substantially in a range of 37 degrees to 55 degrees, and the second angle of attack is greater than the first angle of attack. Specifically, each blade is integrally formed based on a continuous angle of attack variation from the root portion through the body portion to the tip portion, in which the continuous angle of attack variation is substantially in a range of 27 degrees to 55 degrees.
- The detailed technology and above preferred embodiments implemented for the present invention are described in the following paragraphs accompanying the appended drawings for people skilled in this field to well appreciate the features of the claimed invention.
- The foregoing aspects and many of the accompanying advantages of this invention will become more readily appreciated as the same becomes better understood by reference to the following detailed description when taken in conjunction with the accompanying drawings, wherein:
-
FIG. 1 is a cross-sectional view of a blade of a conventional axial flow device. -
FIG. 2A is a cross-sectional view of the root portion of a blade of another conventional axial flow device. -
FIG. 2B is a cross-sectional view of the tip portion of the blade shown inFIG. 2A . -
FIG. 3 is a perspective view of the axial flow device according to one preferred embodiment of the present invention. -
FIG. 4 is a top view of the axial flow device shown inFIG. 3 . -
FIG. 5 is a side view of the axial flow device shown inFIG. 3 . -
FIG. 6A is a cross-sectional view along line A-A shown inFIG. 4 . -
FIG. 6B is a cross-sectional view along line B-B shown inFIG. 4 . -
FIG. 7 is a diagram illustrating the angle of attack variation distribution of each blade of the axial flow device according to one embodiment of the present invention. -
FIG. 8A illustrates a blade with a straight planform. -
FIG. 8B illustrates a blade which is forwardly skewed. -
FIG. 8C illustrates a blade which is backwardly skewed. -
FIG. 8D illustrates a blade which is backwardly skewed in the region adjacent to the root portion and forwardly skewed in the region adjacent to the tip portion. -
FIG. 8E illustrates a blade which is forwardly skewed in the region adjacent to the root portion and backwardly skewed in the region adjacent to the tip portion. -
FIG. 9 illustrates a frame of the axial flow device according to the present invention. -
FIG. 10 is a diagram showing the characteristic curves of the axial flow device according to the present invention and the conventional axial flow device shown inFIG. 2A andFIG. 2B . - The detailed explanation of the present invention is described as following. The described preferred embodiments are presented for purposes of illustrations and descriptions, and they are not intended to limit the scope of the present invention.
- Please refer to
FIG. 3 ,FIG. 4 andFIG. 5 . Anaxial flow device 3 in one preferred embodiment of the present invention, such as an axial flow fan or pump, includes ahub 31 having anouter periphery 311 and a plurality ofblades 33, in which each blade has aroot portion 331, atip portion 335 and abody portion 333 between theroot portion 331 and thetip portion 335, and projects outward from theouter periphery 311 of thehub 31. Furthermore, theroot portion 331 has a first angle of attack α1 substantially in a range of 27 degrees to 45 degrees as shown inFIG. 6A , thetip portion 335 has a second angle of attack α2 substantially in a range of 37 degrees to 55 degrees as shown inFIG. 6B , and the second angle of attack α2 is greater than the first angle of attack α1. Specifically, as shown inFIG. 5 , eachblade 33 is integrally formed based on a continuous angle of attack variation from theroot portion 331 through thebody portion 333 to thetip portion 335, in which the continuous angle of attack variation is substantially in a range of 27 degrees to 55 degrees, and the angle difference α between the second angle of attack α2 and the first angle of attack α1, which means α is equal to α2 minus α1, is substantially in a range of 6 degrees to 28 degrees. -
FIG. 7 is a diagram illustrating the angle of attack variation distribution of eachblade 33 of theaxial flow device 3 according to one embodiment of the present invention, in which point O illustrates the angle of attack of theroot portion 331 and point T illustrates the angle of attack of thetip portion 335. In example 1, which is described by a linear increasing function as shown inFIG. 7 , the angle of attack uniformly varies from theroot portion 331 through thebody portion 333 to thetip portion 335, in which the angle of attack of thetip portion 335 is greater than the angle of attack of theroot portion 331 and the angle of attack increases gradually from theroot portion 331 to thetip portion 335. In example 2, which is described by an increasing function of which the graph opens up as shown inFIG. 7 , the varying rate of the angle of attack increases from theroot portion 331 through thebody portion 333 to thetip portion 335, in which the angle of attack of thetip portion 335 is greater than the angle of attack of theroot portion 331. In example 3, which is described by an increasing function of which the graph opens down as shown inFIG. 7 , the varying rate of the angle of attack decreases from theroot portion 331 through thebody portion 333 to thetip portion 335, in which the angle of attack of thetip portion 335 is greater than the angle of attack of theroot portion 331. -
FIGS. 8A-8E illustrate several blade designs according to different aspects of the present invention. InFIG. 8A , theblades 33 are “unskewed”: eachblade 33 has a straight planform in which a radial center line of theblade 33 is straight and the blade chords perpendicular to the radial center line are uniformly distributed about the line. InFIG. 8B , eachblade 33 is forwardly skewed: the blade center line curves in the direction of rotation D of theaxial flow device 3. InFIG. 8C , eachblade 33 is backwardly skewed: the blade center line curves away from the direction of rotation D of theaxial flow device 3. InFIG. 8D , eachblade 33 is backwardly skewed in the region adjacent to theroot portion 331 and forwardly skewed in the region adjacent to thetip portion 335. InFIG. 8E , eachblade 33 is forwardly skewed in the region adjacent to theroot portion 331 and backwardly skewed in the region adjacent to thetip portion 335. Moreover, as illustrates inFIG. 9 , theaxial flow device 3 further includes aframe 4, in which the plurality ofblades 33 project outward radially from theouter periphery 311 of thehub 31 toward theframe 4. - The effect of the present invention has been verified in experiments and the results of which are shown in
FIG. 10 , in which an axial flow device according to the present invention is compared with a conventional axial flow device shown inFIG. 2A andFIG. 2B . As shown inFIG. 10 , at the same rotational speed, the axial flow device according to the present invention attains higher static pressure, higher flow rate and overall better performance. Especially, in the characteristic curve of the conventional axial flow device as shown inFIG. 10 , there is an instability region, which is the concave section of the curve in theoperational area 5, arising from point X1 through point X2, point X3 to point X4, and it causes the conventional axial flow device to surge and stall; however, in the characteristic curves of the axial flow device according to the present invention, the instability region in theoperational area 5 is significantly decreased as shown inFIG. 10 and thus it makes the axial flow device more efficient and attains higher flow rate at same static pressure compared with the conventional axial flow device. Accordingly, the axial flow device according to the present invention provides higher static pressure inoperational area 5 to overcome resistance so as to achieve higher flow rate and improve efficiency of the axial flow device for reducing energy consumption without increasing the fabricating process complexity and manufacturing cost. - Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.
Claims (12)
1. An axial flow device, comprising:
a hub having an outer periphery; and
a plurality of blades, wherein each blade has a root portion, a tip portion and a body portion between the root portion and the tip portion and projects outward from the outer periphery of the hub, wherein the root portion has a first angle of attack and the tip portion has a second angle of attack, wherein the second angle of attack is greater than the first angle of attack, wherein the blade is integrally formed based on a continuous angle of attack variation from the root portion through the body portion to the tip portion.
2. An axial flow device according to claim 1 , wherein the continuous angle of attack variation is substantially in a range of 27 degrees to 55 degrees.
3. An axial flow device according to claim 1 , wherein the first angle of attack is substantially in a range of 27 degrees to 45 degrees.
4. An axial flow device according to claim 1 , wherein the second angle of attack is substantially in a range of 37 degrees to 55 degrees.
5. An axial flow device according to claim 1 , wherein the angle of attack uniformly varies from the root portion through the body portion to the tip portion.
6. An axial flow device according to claim 1 , wherein the varying rate of the angle of attack increases from the root portion through the body portion to the tip portion.
7. An axial flow device according to claim 1 , wherein the varying rate of the angle of attack decreases from the root portion through the body portion to the tip portion.
8. An axial flow device according to claim 1 , wherein each blade is forwardly skewed.
9. An axial flow device according to claim 1 , wherein each blade is backwardly skewed.
10. An axial flow device according to claim 1 , wherein each blade is backwardly skewed in the region adjacent to the root portion and forwardly skewed in the region adjacent to the tip portion.
11. An axial flow device according to claim 1 , wherein each blade is forwardly skewed in the region adjacent to the root portion and backwardly skewed in the region adjacent to the tip portion.
12. An axial flow device according to claim 1 , further comprising a frame, wherein the plurality of blades project outward radially from the outer periphery of the hub toward the frame.
Priority Applications (1)
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US13/367,374 US20130202443A1 (en) | 2012-02-07 | 2012-02-07 | Axial flow device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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US13/367,374 US20130202443A1 (en) | 2012-02-07 | 2012-02-07 | Axial flow device |
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US20130202443A1 true US20130202443A1 (en) | 2013-08-08 |
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ID=48903042
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US13/367,374 Abandoned US20130202443A1 (en) | 2012-02-07 | 2012-02-07 | Axial flow device |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD910834S1 (en) * | 2018-12-05 | 2021-02-16 | Asia Vital Components Co., Ltd. | Impeller for a fan |
US11248620B2 (en) * | 2018-09-21 | 2022-02-15 | Techtronic Cordless Gp | Electric blower with an axial fan and motor for sweeping and cleaning |
CN114377569A (en) * | 2022-01-17 | 2022-04-22 | 江苏大学镇江流体工程装备技术研究院 | Bionic blade for stirring non-Newtonian fluid |
US11359641B1 (en) * | 2021-10-14 | 2022-06-14 | Stokes Technology Development Ltd. | Air moving device with blade tip of variable curvature |
USD980965S1 (en) * | 2019-05-07 | 2023-03-14 | Carrier Corporation | Leading edge of a fan blade |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4411598A (en) * | 1979-12-12 | 1983-10-25 | Nissan Motor Company, Limited | Fluid propeller fan |
US5112192A (en) * | 1990-07-26 | 1992-05-12 | General Signal Corporation | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities |
US6071077A (en) * | 1996-04-09 | 2000-06-06 | Rolls-Royce Plc | Swept fan blade |
US6328533B1 (en) * | 1999-12-21 | 2001-12-11 | General Electric Company | Swept barrel airfoil |
US6733241B2 (en) * | 2002-07-11 | 2004-05-11 | Hunter Fan Company | High efficiency ceiling fan |
US7108486B2 (en) * | 2003-02-27 | 2006-09-19 | Snecma Moteurs | Backswept turbojet blade |
US7413410B2 (en) * | 2005-03-21 | 2008-08-19 | Hunter Fan Company | Ceiling fan blade |
-
2012
- 2012-02-07 US US13/367,374 patent/US20130202443A1/en not_active Abandoned
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4411598A (en) * | 1979-12-12 | 1983-10-25 | Nissan Motor Company, Limited | Fluid propeller fan |
US5112192A (en) * | 1990-07-26 | 1992-05-12 | General Signal Corporation | Mixing impellers and impeller systems for mixing and blending liquids and liquid suspensions having a wide range of viscosities |
US6071077A (en) * | 1996-04-09 | 2000-06-06 | Rolls-Royce Plc | Swept fan blade |
US6328533B1 (en) * | 1999-12-21 | 2001-12-11 | General Electric Company | Swept barrel airfoil |
US6733241B2 (en) * | 2002-07-11 | 2004-05-11 | Hunter Fan Company | High efficiency ceiling fan |
US7108486B2 (en) * | 2003-02-27 | 2006-09-19 | Snecma Moteurs | Backswept turbojet blade |
US7413410B2 (en) * | 2005-03-21 | 2008-08-19 | Hunter Fan Company | Ceiling fan blade |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11248620B2 (en) * | 2018-09-21 | 2022-02-15 | Techtronic Cordless Gp | Electric blower with an axial fan and motor for sweeping and cleaning |
USD910834S1 (en) * | 2018-12-05 | 2021-02-16 | Asia Vital Components Co., Ltd. | Impeller for a fan |
USD980965S1 (en) * | 2019-05-07 | 2023-03-14 | Carrier Corporation | Leading edge of a fan blade |
US11359641B1 (en) * | 2021-10-14 | 2022-06-14 | Stokes Technology Development Ltd. | Air moving device with blade tip of variable curvature |
CN114377569A (en) * | 2022-01-17 | 2022-04-22 | 江苏大学镇江流体工程装备技术研究院 | Bionic blade for stirring non-Newtonian fluid |
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Owner name: APPLIED THERMALFLUID ANALYSIS CENTER, LTD., TAIWAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TZENG, YIH-WEI;REEL/FRAME:027660/0774 Effective date: 20120207 |
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