US3822103A - Flexible fan - Google Patents

Flexible fan Download PDF

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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
Application number
US00318421A
Other languages
English (en)
Inventor
T Hori
M Hayashi
M Yoshida
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Application granted granted Critical
Publication of US3822103A publication Critical patent/US3822103A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04D29/32—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.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00318421A 1972-01-08 1972-12-26 Flexible fan Expired - Lifetime US3822103A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47004800A JPS512646B2 (fi) 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 (fi)
JP (1) JPS512646B2 (fi)
GB (1) GB1379701A (fi)

Cited By (10)

* Cited by examiner, † Cited by third party
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 (de) * 2020-08-17 2022-02-24 Siemens Aktiengesellschaft Lüfter und dynamoelektrische maschine mit einem lüfter

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53103907U (fi) * 1977-01-26 1978-08-22
JPS6247800U (fi) * 1985-09-12 1987-03-24

Citations (5)

* Cited by examiner, † Cited by third party
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 (de) * 1969-03-21 1970-10-08 Hill, Aubrey Colin, Warrnambool (Australien) Schiffsschraube
US3584969A (en) * 1968-05-25 1971-06-15 Aisin Seiki Flexible blade fan

Patent Citations (5)

* Cited by examiner, † Cited by third party
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 (de) * 1969-03-21 1970-10-08 Hill, Aubrey Colin, Warrnambool (Australien) Schiffsschraube

Cited By (13)

* Cited by examiner, † Cited by third party
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 (de) * 2020-08-17 2022-02-24 Siemens Aktiengesellschaft Lüfter und dynamoelektrische maschine mit einem lüfter

Also Published As

Publication number Publication date
GB1379701A (en) 1975-01-08
JPS512646B2 (fi) 1976-01-28
JPS4874607A (fi) 1973-10-08

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