US3822103A - Flexible fan - Google Patents
Flexible fan Download PDFInfo
- Publication number
- US3822103A US3822103A US00318421A US31842172A US3822103A US 3822103 A US3822103 A US 3822103A US 00318421 A US00318421 A US 00318421A US 31842172 A US31842172 A US 31842172A US 3822103 A US3822103 A US 3822103A
- Authority
- US
- United States
- Prior art keywords
- fan
- edge portion
- leading edge
- flexible
- 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.)
- Expired - Lifetime
Links
- 238000010276 construction Methods 0.000 claims abstract description 6
- 238000005452 bending Methods 0.000 claims description 8
- 239000012260 resinous material Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 4
- 239000000057 synthetic resin Substances 0.000 abstract description 3
- 229920003002 synthetic resin Polymers 0.000 abstract description 3
- 238000001816 cooling Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 2
- 101100402341 Caenorhabditis elegans mpk-1 gene Proteins 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
- F04D29/382—Flexible blades
-
- 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
- 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
- F04D29/388—Blades characterised by construction
Definitions
- the invention relates to a flexible fan/comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the'flexible fan being characterized in that, a
- FIG.1 ' sum 1 or 3 FIG.1
- FIG. 5 is a distributive view of pressure operating the blades, when blades are flooded;
- FIG. 6 is a view showingthe deformed condition of blades when the blades are flooded; and t I FIG. 7 is a view similar to that of FIG; 2, illustrating,
- the reference numeral 10 designates a fan boss and a plurality of blades 11 are radially extended'from an outerperipheral portion 12 of the fan boss 10.
- the fan boss 10 and the blades 11 are integrally formed and made of such as synthetic resin.
- the reference numeral 13 is a pilot hole for connecting with a pulley seat, not shown,and a plurality of bolt holes 14 is provided on the fanboss 10.
- the ventilation isgenerally ventilated almost parallel. to a rotational axle, not shown, Accordingto FIG. 2, the incidence angle against a rotational direction 15 of a warpedline 16 of the blades 11 in a leading edge portion 18 is" zero or a little negative angle-is applied to the leading edge portion l8.
- the reference numeral 18a shows a leadingedge portion of a conventional blade, and assuming that an angle against a wing chord 17a of the leading edge portion 18a against the extension of the warped line 16 is [32, an angle a of inclination of the wingichord 17a againstthe rotational direction 15, is larger than the angle'fi of the leading-edge portion 18a and the leading edge portion 18a is spread from the rotational direction 15 in the upper direction (toward the radiator, not shown).
- a groove'20 is provided on the middle portion of the blade 11 soas to easily bend a trailingedge portion 19 of the blade 11 when the hydraulic pressure orwind pressure is operated to the blade-'11 as shown in .FIGSJI and 2.
- An arc-shaped groove or a thin face 21 may be formed on the trailing edge portion 19 of the blade in order to specially bend ing detailed description when considered in connection with the accompanying drawings, wherein like reference characters designate like or corresponding parts throughout the several views and wherein:
- FIG. 1 is a front view of the fan assembly of this inve'ntion,. but partially illustrated;
- FIG.' 2 is a sectional view taken along the line II'-II of FIG. 1;
- the groove 20 can be on a surface 22 or the inside surface 23, or on both the sur- 1 face 22 and the surface 23 as shownin FIG. 3.
- the ventilation speed of the surface 22 is swifter than I when on the inside 23 in the operating state, namely, Reynolds number ishigh and the fan efficiency is re-' I Jerusalem, therefore it is desirable to provide the groove 20 I on the inside 23. It is not necessary to provide the in this invention as viewed in FIG. 7.
- the impact force at this moment and the increasing pressure force on the inside 23 of the blade 11 are very large and the positive pressure is normally applied to the inside 23 of the leading edge portion .18 as shown in FIG. 5, but the negative pressure is supplied thereto in this invention.
- the positive pressure is provided on the inside 23 of the trailing edge portion 19 also in the normal blade or in the blade 11 according to this invention.
- the warped line 16 of the leading edge portion 18 of the blade 11 is almost parallel'to or at a slight negative angle to the rotational direction so that only the impact force is applied to the leading edge portion 18 also at the moment of arrival at the flooded area 24 or thereafter, and the water pressure is supplied to the inside 23 of the blade 11 at the trailing edge portion 19 as viewed in FIG. 5 so that only the trailing edge portion 19 tends to bend upwards in FIG. 6.
- the bending force is, however, absorbed by the groove 20 provided on the inside 23 of the blade 11. Therefore, the bending force does not influence the leading edge portion 18 and so the leading edge portion 18 of the blade 11 is not displaced with respect to face of the fan.
- the abovementioned rate to the chord length of the bent portion of the leading edge shows the rate against the chord length of the length projected to the bent portion of the leading edge on the chord length.
- said flexible fan having an angle a between a wing chord and the rotational direction of said fan blades and an angle B between said wing chord and a tangent line of a warped line in the'leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and percent.
- a flexible fan comprising:
- said flexible fan having anangle a between a wing chord and the rotational direction of said fan blades and an angle [3 between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.
Abstract
The invention relates to a flexible fan comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the flexible fan being characterized in that, alpha shows an angle of inclination of a wing chord against the rotational direction of the blade and beta shows an angle against the wing chord of a leading edge portion of the fan blades, and alpha </= beta is represented.
Description
United States Patent 1191 Hori et al.
11 3,822,103 July 2, 1974 [5 FLEXIBLE FAN [75] Inventors: Takanobu Hori; Masaharu Hayashi, both of Toyota; Motoharu Yoshida, lchimiya, all of Japan i 73 Assignee: Aisin SeikiKabushikiKaisha,
Kariya. Aichi Pref., Japan [22] Filed:' Dec. 26, 1972 1211 Appl. 1\16.5311;,421
[30] Foreign Application Priority Data [51] Int. Cl. F04d 29/38 58 Field f Search 416/132, 240, 241A [56] References Cited UNITED STATES PATENTS Antoni 416/132 x Japan 47 4800 521'u.s.c1.. ..416/-132,416 240,416/241 3,054,355 9/1962 Neely ..416/240x 3,409,968 1 1/1968 Denes' 3,584,969 6/1971 Aiki ct a1. 416/132 FOREIGN PATENTS OR APPLICATIONS 2,013,481 10/1970 Germany 416/132 Primary Examiner-Everette A. Powell, Jr. Attorney, Agent, or Firm-Pierce, Scheffler & Parker [57 ABSTRACT I The invention relates to a flexible fan/comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the'flexible fan being characterized in that, a
shows an angle of inclination of a wing chord against the rotational direction of the blade and B shows an angle against the wing chord of a leading edge portion of the-fan blades, and a 1 B is represented.
Clainis, 7 Drawing Figures PAIENIEDJuL 2:914 3.822.103
' sum 1 or 3 FIG.1
1 FLEXIBLE FAN BACKGROUND OF THE INVENTION that the road conditionsare satisfactory for running of the vehicle, if circumstances require the vehicle to run on a flooded road not only in the rainy season, but also Y in the normal state. In that case the water is driven up bythe front portion of the tire that is, the lowest portion of the fan is deformed and a lower part of the fan blade is flooded, sothat the blade is unusually deformed by the impact force of the water. The fan is susceptible to damage by contacting the radiator.
Therefore, in the conventional fan a large gap between the blade and the radiator is necessary in order to prevent'the fan from contacting with the radiator, or the thicknessof the leadingedge portion is reduced or a reinforced material is supplied. However, the cooling efficiency of the vehicle engine is reduced and an unreasonable arrangement in the engine compartment is necessary. The abovementioned drawbacks of the former is not fully overcome by the latter and further the weight of the fan blade is increased and the cooling efficiency of the vehicle engine is reduced in the latter.
SUMMARY OF THE INVENTION It is,itherefore, an object of the present invention to provide an improved fan assembly adapted for obviating the aforementioned drawbacks of the conventional fan assembly. I
It is another object of the present invention to provide an improved fan assembly for eliminating the displacement of thejleading edge portion of the blade toward the radiator when the blade encounters a flooded area. i c f It is still another object of the present invention to provide an improved fan assembly for raising the cooling efficiency of an engine by minimizing the gap between the radiator and the fan.
BRIEF DESCRIPTION OF THE DRAWINGS Various other objects," features and attendant advantages of this invention will be more fully appreciated as the same becomes better understood from the follow- 2 FIG. 5 is a distributive view of pressure operating the blades, when blades are flooded;
FIG. 6 is a view showingthe deformed condition of blades when the blades are flooded; and t I FIG. 7 is a view similar to that of FIG; 2, illustrating,
however, a fourth embodiment of this invention:
DESCRIPTION OF THE ILLUSTRATED I I EMBODIMENTS Referring now to the drawings, and more particularly to FIG. 1 thereof, the fanassembly of this invention will be described hereinbelow in detail.
In this Figure, the reference numeral 10 designates a fan boss and a plurality of blades 11 are radially extended'from an outerperipheral portion 12 of the fan boss 10. The fan boss 10 and the blades 11 are integrally formed and made of such as synthetic resin. The reference numeral 13 isa pilot hole for connecting with a pulley seat, not shown,and a plurality of bolt holes 14 is provided on the fanboss 10. The ventilation isgenerally ventilated almost parallel. to a rotational axle, not shown, Accordingto FIG. 2, the incidence angle against a rotational direction 15 of a warpedline 16 of the blades 11 in a leading edge portion 18 is" zero or a little negative angle-is applied to the leading edge portion l8. That is to say, supposing that an angle of inclination of a wing chord 17 against the rotational direction 15 of the warped line 16v is a and angle 6,, against the wing chord 17 of the leading edge portion 18 is nearly equal to the angled, or the angle [3, is only larger-than the angle a Next referring to FIG. 2, the reference numeral 18a shows a leadingedge portion of a conventional blade, and assuming that an angle against a wing chord 17a of the leading edge portion 18a against the extension of the warped line 16 is [32, an angle a of inclination of the wingichord 17a againstthe rotational direction 15, is larger than the angle'fi of the leading-edge portion 18a and the leading edge portion 18a is spread from the rotational direction 15 in the upper direction (toward the radiator, not shown). A groove'20 is provided on the middle portion of the blade 11 soas to easily bend a trailingedge portion 19 of the blade 11 when the hydraulic pressure orwind pressure is operated to the blade-'11 as shown in .FIGSJI and 2. An arc-shaped groove or a thin face 21 may be formed on the trailing edge portion 19 of the blade in order to specially bend ing detailed description when considered in connection with the accompanying drawings, wherein like reference characters designate like or corresponding parts throughout the several views and wherein:
FIG. 1 isa front view of the fan assembly of this inve'ntion,. but partially illustrated;
FIG.' 2 is a sectional view taken along the line II'-II of FIG. 1;
the trailing edge portion 19 thereof as viewed in FIG. 7.
As to the arrangement of the groove 20, it can be on a surface 22 or the inside surface 23, or on both the sur- 1 face 22 and the surface 23 as shownin FIG. 3. When the groove 20 is, however, provided on the surface 22 the ventilation speed of the surface 22 is swifter than I when on the inside 23 in the operating state, namely, Reynolds number ishigh and the fan efficiency is re-' I duced, therefore it is desirable to provide the groove 20 I on the inside 23. It is not necessary to provide the in this invention as viewed in FIG. 7.
When the blade 11 reaches a flooded area 24 in the increasing state of the number of fan rotation as seen groove 20, thearc-shaped groove, or the thin face 21 in FIG. 6, the impact force at this moment and the increasing pressure force on the inside 23 of the blade 11 are very large and the positive pressure is normally applied to the inside 23 of the leading edge portion .18 as shown in FIG. 5, but the negative pressure is supplied thereto in this invention. The positive pressure is provided on the inside 23 of the trailing edge portion 19 also in the normal blade or in the blade 11 according to this invention.
However, when the blade 11 reaches the flooded area 24 the blade 11 is bent almost parallel to the warped line 16a of the blade 11 in the normal fan and passes the flooded area 24, and then the blade 11 is restored to the original state.
The warped line 16 of the leading edge portion 18 of the blade 11 is almost parallel'to or at a slight negative angle to the rotational direction so that only the impact force is applied to the leading edge portion 18 also at the moment of arrival at the flooded area 24 or thereafter, and the water pressure is supplied to the inside 23 of the blade 11 at the trailing edge portion 19 as viewed in FIG. 5 so that only the trailing edge portion 19 tends to bend upwards in FIG. 6. The bending force is, however, absorbed by the groove 20 provided on the inside 23 of the blade 11. Therefore, the bending force does not influence the leading edge portion 18 and so the leading edge portion 18 of the blade 11 is not displaced with respect to face of the fan.
The result of the experiment between the fan accord- I ing to this invention and the fan according to conventional type is showed as follows;
Fan of this leading edge of fan (number of fan rotations 3000-3500 r.p.m.)
The abovementioned rate to the chord length of the bent portion of the leading edge shows the rate against the chord length of the length projected to the bent portion of the leading edge on the chord length.
lt is desirable, that the rate to the chord length'of one piece construction and made of synthetic res- Y inous material; said flexible fan having an angle a between a wing chord and the rotational direction of said fan blades and an angle B between said wing chord and a tangent line of a warped line in the'leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and percent.
2. The flexible fan as set forth in claim 1, wherein a groove is provided on said fan blade so that the trailing bent portion is 8-30 percent. But when the rate reaches over 8-3O percent the cooling efficiency becomes bad, and when the rate is under 20-24 percent the effect for preventing the bending becomes-little.
Obviously many changes and modifications of the edge portion of said fan blade is easily bent.
3. The flexible fan as set forth in claim 2, wherein said groove is formed on said trailing edgeportion.
4. The flexible fan as set forth in claim 2, wherein a thin face is formed on said trailing edge portion.
5. A flexible fan comprising:
a boss portion; and
a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made. of synthetic resinous material;
said flexible fan having anangle a between a wing chord and the rotational direction of said fan blades and an angle [3 between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.
6. The flexible fan as set forth in claim 5, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
7. The flexible fan as set forth in claim 6, wherein said groove is formed on said trailing edge portion.
8. The flexible fan as set forth in claim 6, wherein a thin face is formed on said trailing edge portion.
Claims (8)
1. A flexible fan comprising: a boss portion; and a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made of synthetic resinous material; said flexible fan having an angle Alpha between a wing chord and the rotational direction of said fan blades and an angle Beta between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which Alpha is not greater than Beta , said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and 30 percent.
2. The flexible fan as set forth in claim 1, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
3. The flexible fan as set forth in claim 2, wherein said groove is formed on said trailing edge portion.
4. The flexible fan as set forth in claim 2, wherein a thin face is formed on said trailing edge portion.
5. A flexible fan comprisinG: a boss portion; and a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made of synthetic resinous material; said flexible fan having an angle Alpha between a wing chord and the rotational direction of said fan blades and an angle Beta between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which Alpha is not greater than Beta , said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.
6. The flexible fan as set forth in claim 5, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
7. The flexible fan as set forth in claim 6, wherein said groove is formed on said trailing edge portion.
8. The flexible fan as set forth in claim 6, wherein a thin face is formed on said trailing edge portion.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP47004800A JPS512646B2 (en) | 1972-01-08 | 1972-01-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3822103A true US3822103A (en) | 1974-07-02 |
Family
ID=11593831
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00318421A Expired - Lifetime US3822103A (en) | 1972-01-08 | 1972-12-26 | Flexible fan |
Country Status (3)
Country | Link |
---|---|
US (1) | US3822103A (en) |
JP (1) | JPS512646B2 (en) |
GB (1) | GB1379701A (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3914068A (en) * | 1972-01-25 | 1975-10-21 | Sueddeutsche Kuehler Behr | Fan for motor vehicles |
US4063826A (en) * | 1975-05-20 | 1977-12-20 | Waldemar Riepe | Flexible, oscillating blade liquid pump |
US4515511A (en) * | 1982-12-31 | 1985-05-07 | Siemens Aktiengesellschaft | Axial fan with blades that automatically adjust to the direction of rotation |
US4671739A (en) * | 1980-07-11 | 1987-06-09 | Robert W. Read | One piece molded fan |
US6554574B1 (en) * | 1998-03-23 | 2003-04-29 | Spal S.R.L. | Axial flow fan |
US6558123B1 (en) * | 1998-03-23 | 2003-05-06 | Spal S.R.L. | Axial flow fan |
US20090047131A1 (en) * | 2007-08-14 | 2009-02-19 | Neumann Joel G | Electrical Generation Device - Turbine Rotor Shape For Electrical Power Generation From Moving Fluid |
US20120100006A1 (en) * | 2010-10-22 | 2012-04-26 | Rolls-Royce Plc | Blade |
US10539157B2 (en) | 2015-04-08 | 2020-01-21 | Horton, Inc. | Fan blade surface features |
WO2022037850A1 (en) * | 2020-08-17 | 2022-02-24 | Siemens Aktiengesellschaft | Fan, and dynamoelectric machine comprising a fan |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS53103907U (en) * | 1977-01-26 | 1978-08-22 | ||
JPS6247800U (en) * | 1985-09-12 | 1987-03-24 |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1798299A (en) * | 1926-12-31 | 1931-03-31 | Antoni Ugo | Rotary flexible propeller |
US3054355A (en) * | 1961-04-25 | 1962-09-18 | Lord Mfg Co | Pump |
US3409968A (en) * | 1966-10-03 | 1968-11-12 | Borg Warner | Method of making a slotted blade by extruding |
DE2013481A1 (en) * | 1969-03-21 | 1970-10-08 | Hill, Aubrey Colin, Warrnambool (Australien) | Propeller |
US3584969A (en) * | 1968-05-25 | 1971-06-15 | Aisin Seiki | Flexible blade fan |
-
1972
- 1972-01-08 JP JP47004800A patent/JPS512646B2/ja not_active Expired
- 1972-12-26 US US00318421A patent/US3822103A/en not_active Expired - Lifetime
-
1973
- 1973-01-08 GB GB103373A patent/GB1379701A/en not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1798299A (en) * | 1926-12-31 | 1931-03-31 | Antoni Ugo | Rotary flexible propeller |
US3054355A (en) * | 1961-04-25 | 1962-09-18 | Lord Mfg Co | Pump |
US3409968A (en) * | 1966-10-03 | 1968-11-12 | Borg Warner | Method of making a slotted blade by extruding |
US3584969A (en) * | 1968-05-25 | 1971-06-15 | Aisin Seiki | Flexible blade fan |
DE2013481A1 (en) * | 1969-03-21 | 1970-10-08 | Hill, Aubrey Colin, Warrnambool (Australien) | Propeller |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3914068A (en) * | 1972-01-25 | 1975-10-21 | Sueddeutsche Kuehler Behr | Fan for motor vehicles |
US4063826A (en) * | 1975-05-20 | 1977-12-20 | Waldemar Riepe | Flexible, oscillating blade liquid pump |
US4671739A (en) * | 1980-07-11 | 1987-06-09 | Robert W. Read | One piece molded fan |
US4515511A (en) * | 1982-12-31 | 1985-05-07 | Siemens Aktiengesellschaft | Axial fan with blades that automatically adjust to the direction of rotation |
US6554574B1 (en) * | 1998-03-23 | 2003-04-29 | Spal S.R.L. | Axial flow fan |
US6558123B1 (en) * | 1998-03-23 | 2003-05-06 | Spal S.R.L. | Axial flow fan |
US20090047131A1 (en) * | 2007-08-14 | 2009-02-19 | Neumann Joel G | Electrical Generation Device - Turbine Rotor Shape For Electrical Power Generation From Moving Fluid |
US7997870B2 (en) | 2007-08-14 | 2011-08-16 | B N Balance Energy Solutions, Llc | Turbine rotor for electrical power generation |
US20120100006A1 (en) * | 2010-10-22 | 2012-04-26 | Rolls-Royce Plc | Blade |
US8668456B2 (en) * | 2010-10-22 | 2014-03-11 | Rolls-Royce Plc | Blade |
US10539157B2 (en) | 2015-04-08 | 2020-01-21 | Horton, Inc. | Fan blade surface features |
US10662975B2 (en) * | 2015-04-08 | 2020-05-26 | Horton, Inc. | Fan blade surface features |
WO2022037850A1 (en) * | 2020-08-17 | 2022-02-24 | Siemens Aktiengesellschaft | Fan, and dynamoelectric machine comprising a fan |
Also Published As
Publication number | Publication date |
---|---|
GB1379701A (en) | 1975-01-08 |
JPS4874607A (en) | 1973-10-08 |
JPS512646B2 (en) | 1976-01-28 |
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