US3856434A - Centrifugal fan wheel - Google Patents

Centrifugal fan wheel Download PDF

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Publication number
US3856434A
US3856434A US00407725A US40772573A US3856434A US 3856434 A US3856434 A US 3856434A US 00407725 A US00407725 A US 00407725A US 40772573 A US40772573 A US 40772573A US 3856434 A US3856434 A US 3856434A
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United States
Prior art keywords
plate
piece
center
nose
tail
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
US00407725A
Inventor
J Hoffmann
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AMERICAN DAVIDSON Inc
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Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US00407725A priority Critical patent/US3856434A/en
Priority to CA209,126A priority patent/CA979868A/en
Priority to GB4435174A priority patent/GB1477056A/en
Priority to JP1974123646U priority patent/JPS5325844Y2/ja
Application granted granted Critical
Publication of US3856434A publication Critical patent/US3856434A/en
Assigned to AMERICAN DAVIDSON, INC. reassignment AMERICAN DAVIDSON, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WESTINGHOUSE ELECTRIC CORPORATION
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
    • F04D29/28—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
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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
    • F01D5/147—Construction, i.e. structural features, e.g. of weight-saving hollow 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes

Definitions

  • This invention relates to centrifugal fan wheel blade assemblies.
  • the airfoil-type fan blades on a centrifugal fan wheel are extremely susceptible to wear in an erosive atmosphere.
  • the deterioration of these blades has been remedied in the past by either pre-fitting the blades with wear liners or rebuilding the entire wheel at the factory.
  • the blades are usually permanently affixed to the fan wheel, it is desirable to provide a blade assembly in which the worn part of the blades can be easily replaced without a substantial dismantlement of the fan wheel. Replacement of the entire blade often isnt necessary since it is the leading edge of the blade that is exposed to the full impact of the eroding particles entrapped in the moving gas stream, and it is usually the leading edge that first becomes worn and alters the airflow of the gas stream.
  • the leading edges of the blades comprise removable nosepieces which can be replaced easily and conveniently in the field.
  • This invention provides a fan wheel blade nose-piece assembly which may be easily replaced in the field.
  • a plurality of airfoil-type fan blades are mounted between the centerplate of the fan wheel and the sideplate.
  • Each fan blade has two sections: a nose-piece and a tail-piece.
  • the tail-piece is permanently secured between the center-plate and the side-plate and the nosepiece is removably secured between the center-plate and the side-plate.
  • the nosepiece is provided with an aperture, extending through the major axis of the nose-piece from the side-plate to the center-plate.
  • Bolt means extend through this aperture to removably secure the nose-piece between the side-plates of the fan wheel. Screws may be located in both the tail-piece and the nose-piece to secure the skin of the tail-piece to the nose-piece.
  • FIG. 1 is a side elevational view of the centrifugal fan and blade assembly partially cut away to show the location of one of the blades.
  • FIG. 2 is an enlarged vertical section of one of the blade assemblies showing an exploded view of the assembled relationship of the removable nose-piece and the permanently affixed tail-piece.
  • FIG. 3 is a vertical section of the fan wheel andblade assembly showing the location of the fan blades between the center-plate and the side-plate, and the bolt means removably securing the nose-piece between the plates.
  • FIG. 4 is an enlarged view of the removable bolt means of FIG. 3.
  • FIGS. 1 and 3 show a centrifugal fan wheel and blade assembly 1 having a center-plate l3 and side-plates l4 axially spaced from the center-plate.
  • a plurality of airfoil-type blades 2 are shown mounted to the wheel and between the center-plate l3 and the side-plates 14a and 14b.
  • the fan wheel 1 is symmetric about the center-plate 13, therefore, only the side of the wheel as shown will be discussed.
  • each airfoil-type blade 2 of the blade assembly consists of two segments: namely a nose-piece segment 4 defining the leading edge of the blade when assembled, and a tail-piece segment 3 defining the trailing edge of the blade when assembled.
  • the nose-piece 4 is removably secured to the skin of the tail-piece 3 by threaded fastening means 5 (i.e., screws); if desired, both the nose-piece 4 and the tail-piece 3 may be formed with aligned recessed apertures (not shown) to receive the threaded fastening means 5, and complementary flanges (not shown) to assist in pulling the skin surface of the tail-piece 3 flush with the surface of the nosepiece 4.
  • the blade 2 is positioned in a desirable location between the plates with only the tail-piece 3 permanently secured (such as by welding) between the center-plate 13 and the sideplate 14.
  • the nose-piece 4 is secured between the plates by the complementary arrangement of a thru bolt 6 and a central aperture 7 which extends through the major axis of the nose-piece 4 to receive the thru bolt as shown in FIGS. 1-4.
  • This complementary arrangement comprises the only means of securing the nose-piece between the plates; yet it is easily removed if field replacement of the nose-piece is desired.
  • a centrifugal fan wheel and blade assembly comprising, a center-plate, a side-plate axially spaced from said center-plate, a plurality of airfoil-type blades to be located between said center-plate and said side-plate, each of said airfoil blades having at least two segments including a nose-piece segment defining the leading edge of said airfoil in the assembled relation, said nosepiece segment being provided with an aperture extending longitudinally through the major axis of said nosepiece from the side-plate to the center-plate and a tailpiece segment defining the trailing edge of said airfoil in the assembled relation, means to permanently secure said tail-piece segment between said center-plate and said side-plate, and means to removably secure said nose-piece segment between said center-plate and said side-plate in the assembled relationship, wherein said removable securing means includes a bolt extending through said aperture and said centerand side-plates.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

A centrifugal fan wheel and blade assembly is provided, including a center-plate, a side-plate, and a plurality of twopiece airfoil-type blades located between the plates, each blade having a tail-piece permanently secured between the plates, and a nose-piece removably secured between the plates for field replacement.

Description

United States Patent [191 Hoffmann Dec. 24, 1974 CENTRIFUGAL FAN WHEEL 2,440,317 4/1948 Welsh 416/224 x 3,171,586 31965 A 416 18 [75] Inventor: Joseph NOW/00d 3,263,963 8/1966 11251116 et a1. 416/182 Mass 3,315,941 4/1967 Davies 416/224 Assignee: Westinghouse Electric Corporation, 3,398,883 Al'lByVltZ 4l6/224 Pittsburgh, Pa. 3,426,965 2/1969 Kullmg 416/224 [22] Filed: Oct 18, 1973 FOREIGN PATENTS OR APPLICATIONS 959,583 3/1957 Germany 416/186 M N 407,725 656,336 8/1951 Great Britain 416 224 52 U.S. c1 416/184, 416/186, 416/214, Primary ExaminerEverette Powell,
416/224 Attorney, Agent, or FlrmC. F. Renz [51] Int. Cl. F0411 17/16, F04d 29/30 [58] Field of Search 416/184, 186, 214, 224, [57] ABSTRACT 416/186 A A centrifu a1 fan wheel and blade assembly is pro- 'd d l d' l d l d l v1 e me u mg a center-p ate, a s1 e-p ate, an a p u- [56] References Clted rality of two-piece airfoil-type blades located between UNITED STATES PATENTS the plates, each blade having a tail-piece permanently 978,753 12/1910 Hurst 416/224 secured between the plates, and a nose-piece remov- 1,034,456 8/1912 Hurst ably secured between the plates for field replacement. 1,217,386 2/1917 Banner.. 1,327,812 1/1920 Exton 416/224 2 Claims, 4 Drawmg Flgllres FATENTEIJUEEZMSH Y SHEET 1 [IF 2 FIG. I.
BACKGROUND OF THE INVENTION This invention relates to centrifugal fan wheel blade assemblies.
The airfoil-type fan blades on a centrifugal fan wheel are extremely susceptible to wear in an erosive atmosphere. The deterioration of these blades has been remedied in the past by either pre-fitting the blades with wear liners or rebuilding the entire wheel at the factory. Since the blades are usually permanently affixed to the fan wheel, it is desirable to provide a blade assembly in which the worn part of the blades can be easily replaced without a substantial dismantlement of the fan wheel. Replacement of the entire blade often isnt necessary since it is the leading edge of the blade that is exposed to the full impact of the eroding particles entrapped in the moving gas stream, and it is usually the leading edge that first becomes worn and alters the airflow of the gas stream. Thus, it is desirable that the leading edges of the blades comprise removable nosepieces which can be replaced easily and conveniently in the field.
STATE OF THE PRIOR ART US Pat. No. 3,426,965 shows a centrifugal fan blade assembly which includes a removable frame. However, the nose-piece defining the leading edge of the blade is not removable nor is the tail-piece permanently secured to the fan wheel.
SUMMARY OF THE INVENTION This invention provides a fan wheel blade nose-piece assembly which may be easily replaced in the field. A plurality of airfoil-type fan blades are mounted between the centerplate of the fan wheel and the sideplate.
Each fan blade has two sections: a nose-piece and a tail-piece. The tail-piece is permanently secured between the center-plate and the side-plate and the nosepiece is removably secured between the center-plate and the side-plate. In the preferred form, the nosepiece is provided with an aperture, extending through the major axis of the nose-piece from the side-plate to the center-plate. Bolt means extend through this aperture to removably secure the nose-piece between the side-plates of the fan wheel. Screws may be located in both the tail-piece and the nose-piece to secure the skin of the tail-piece to the nose-piece.
DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of the centrifugal fan and blade assembly partially cut away to show the location of one of the blades.
FIG. 2 is an enlarged vertical section of one of the blade assemblies showing an exploded view of the assembled relationship of the removable nose-piece and the permanently affixed tail-piece.
FIG. 3 is a vertical section of the fan wheel andblade assembly showing the location of the fan blades between the center-plate and the side-plate, and the bolt means removably securing the nose-piece between the plates.
FIG. 4 is an enlarged view of the removable bolt means of FIG. 3.
DETAILED DESCRIPTION FIGS. 1 and 3 show a centrifugal fan wheel and blade assembly 1 having a center-plate l3 and side-plates l4 axially spaced from the center-plate. A plurality of airfoil-type blades 2 are shown mounted to the wheel and between the center-plate l3 and the side-plates 14a and 14b. The fan wheel 1 is symmetric about the center-plate 13, therefore, only the side of the wheel as shown will be discussed.
Referring also to FIGS. 2 and 4, each airfoil-type blade 2 of the blade assembly consists of two segments: namely a nose-piece segment 4 defining the leading edge of the blade when assembled, and a tail-piece segment 3 defining the trailing edge of the blade when assembled. It is preferred that the nose-piece 4 is removably secured to the skin of the tail-piece 3 by threaded fastening means 5 (i.e., screws); if desired, both the nose-piece 4 and the tail-piece 3 may be formed with aligned recessed apertures (not shown) to receive the threaded fastening means 5, and complementary flanges (not shown) to assist in pulling the skin surface of the tail-piece 3 flush with the surface of the nosepiece 4.
In the assembled relationship, the blade 2 is positioned in a desirable location between the plates with only the tail-piece 3 permanently secured (such as by welding) between the center-plate 13 and the sideplate 14. The nose-piece 4 is secured between the plates by the complementary arrangement of a thru bolt 6 and a central aperture 7 which extends through the major axis of the nose-piece 4 to receive the thru bolt as shown in FIGS. 1-4. This complementary arrangement comprises the only means of securing the nose-piece between the plates; yet it is easily removed if field replacement of the nose-piece is desired.
I claim:
1. A centrifugal fan wheel and blade assembly comprising, a center-plate, a side-plate axially spaced from said center-plate, a plurality of airfoil-type blades to be located between said center-plate and said side-plate, each of said airfoil blades having at least two segments including a nose-piece segment defining the leading edge of said airfoil in the assembled relation, said nosepiece segment being provided with an aperture extending longitudinally through the major axis of said nosepiece from the side-plate to the center-plate and a tailpiece segment defining the trailing edge of said airfoil in the assembled relation, means to permanently secure said tail-piece segment between said center-plate and said side-plate, and means to removably secure said nose-piece segment between said center-plate and said side-plate in the assembled relationship, wherein said removable securing means includes a bolt extending through said aperture and said centerand side-plates.
2. Apparatus of claim 1 wherein said nose-piece segment is removably secured to the skin of said tail-piece with threaded fasteners.

Claims (2)

1. A centrifugal fan wheel and blade assembly comprising, a center-plate, a side-plate axially spaced from said center-plate, a plurality of airfoil-type blades to be located between said center-plate and said side-plate, each of said airfoil blades having at least two segments including a nose-piece segment defining the leading edge of said airfoil in the assembled relation, said nose-piece segment being provided with an aperture extending longitudinally through the major axis of said nosepiece from the side-plate to the center-plate and a tail-piece segment defining the trailing edge of said airfoil in the assembled relation, means to permanently secure said tail-piece segment between said center-plate and said side-plate, and means to removably secure said nose-piece segment between said centerplate and said side-plate in the assembled relationship, wherein said removable securing means includes a bolt extending through said aperture and said center- and side-plates.
2. Apparatus of claim 1 wherein said nose-piece segment is removably secured to the skin of said tail-piece with threaded fasteners.
US00407725A 1973-10-18 1973-10-18 Centrifugal fan wheel Expired - Lifetime US3856434A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US00407725A US3856434A (en) 1973-10-18 1973-10-18 Centrifugal fan wheel
CA209,126A CA979868A (en) 1973-10-18 1974-09-12 Centrifugal fan wheel
GB4435174A GB1477056A (en) 1973-10-18 1974-10-14 Centrifugal fan wheel
JP1974123646U JPS5325844Y2 (en) 1973-10-18 1974-10-15

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Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4022540A (en) * 1975-10-02 1977-05-10 General Electric Company Frangible airfoil structure
US4090813A (en) * 1975-05-14 1978-05-23 Hitachi, Ltd. High-efficiency turbo-machine impellers
US4556364A (en) * 1981-07-23 1985-12-03 D. Wickham And Company Limited Centrifugal pumps
US4565495A (en) * 1983-08-11 1986-01-21 Electric Power Research Institute, Inc. Armoring system for an airfoil centrifugal fan
US4738594A (en) * 1986-02-05 1988-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Blades for axial fans
US4874293A (en) * 1988-11-08 1989-10-17 Gutzwiller H Leslie Modified centrifugal airfoil fan wheel
US4993918A (en) * 1989-05-19 1991-02-19 United Technologies Corporation Replaceable fairing for a turbine exhaust case
US5358379A (en) * 1993-10-27 1994-10-25 Westinghouse Electric Corporation Gas turbine vane
US5427503A (en) * 1991-03-15 1995-06-27 Toto Ltd. Multi-stacked circular plate fan provided with blades
US5693992A (en) * 1993-12-28 1997-12-02 Mitsubishi Denki Kabushiki Kaisha Cooling fan structure for AC generator
US6707181B1 (en) * 2002-11-15 2004-03-16 Visteon Global Technologies, Inc. Alternator fan
EP1489264A1 (en) * 2003-06-18 2004-12-22 Siemens Aktiengesellschaft Blade consisting of moduls
WO2007037699A1 (en) * 2005-09-27 2007-04-05 Umoe Mandal As Centrifugal fan
US20070140859A1 (en) * 2005-12-21 2007-06-21 Karl Schreiber Leading edge configuration for compressor blades of gas turbine engines
US20090047133A1 (en) * 2006-03-08 2009-02-19 Daikin Industries, Ltd. Impeller blade for centrifugal blower, blade-supporting rotator, impeller for centrifugal blower, and method for manufacturing impeller for centrifugal blower
US20130119796A1 (en) * 2010-08-04 2013-05-16 Mitsubishi Electric Corporation Rotary electric machine
FR2988785A1 (en) * 2012-03-28 2013-10-04 Snecma Blade for double flow turboshaft engine, has reinforcement extended into longitudinal dimension from edge, where reinforcements include anchoring units and/or fixing units for fixing reinforcements on blade
US20150026980A1 (en) * 2012-03-28 2015-01-29 Snecma Method for disassembling a reinforcement from a part
US9022731B2 (en) 2009-11-03 2015-05-05 Alessandro Seccareccia Centrifugal ceiling fan
EP2848817A3 (en) * 2013-09-12 2015-08-05 Mitsubishi Electric Corporation Centrifugal fan and air-conditioning apparatus
CN107401525A (en) * 2016-04-20 2017-11-28 庞克有限公司 Formed blades and blast fan
CN112901279A (en) * 2021-01-29 2021-06-04 大连理工大学 Turbine blade adopting bolt-fixed ceramic armor
US20210227718A1 (en) * 2020-01-16 2021-07-22 Champ Tech Optical (Foshan) Corporation Heat dissipation fan of electronic device

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978753A (en) * 1909-11-23 1910-12-13 Joseph Hurst Centrifugal pump.
US1034456A (en) * 1911-12-09 1912-08-06 Joseph Hurst Centrifugal pump.
US1217386A (en) * 1912-09-23 1917-02-27 Ingersoll Rand Co Blading construction for turbo-compressor impellers.
US1327812A (en) * 1919-06-06 1920-01-13 American Manganese Steel Co Sectional shoe for the runner-vanes of centrifugal pumps
US2440317A (en) * 1945-04-20 1948-04-27 William H Welsh Pump impeller
GB656336A (en) * 1948-01-19 1951-08-22 Stork Koninklijke Maschf Improvements in and relating to centrifugal fans
DE959583C (en) * 1955-01-15 1957-03-07 Babcock & Wilcox Dampfkessel W Changeable impeller for radial blower
US3171586A (en) * 1963-12-31 1965-03-02 Westinghouse Electric Corp Airfoil bladed fans
US3263963A (en) * 1964-11-05 1966-08-02 Worthington Corp Nozzle blade assembly comprising replaceable and adjustable nozzle blades
US3315941A (en) * 1965-04-27 1967-04-25 Rolls Royce Aerofoil blade for use in a hot fluid stream
US3398883A (en) * 1966-09-06 1968-08-27 Chicago Blower Corp Fan
US3426965A (en) * 1967-01-10 1969-02-11 American Standard Inc Centrifugal fan having removable blade section

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US978753A (en) * 1909-11-23 1910-12-13 Joseph Hurst Centrifugal pump.
US1034456A (en) * 1911-12-09 1912-08-06 Joseph Hurst Centrifugal pump.
US1217386A (en) * 1912-09-23 1917-02-27 Ingersoll Rand Co Blading construction for turbo-compressor impellers.
US1327812A (en) * 1919-06-06 1920-01-13 American Manganese Steel Co Sectional shoe for the runner-vanes of centrifugal pumps
US2440317A (en) * 1945-04-20 1948-04-27 William H Welsh Pump impeller
GB656336A (en) * 1948-01-19 1951-08-22 Stork Koninklijke Maschf Improvements in and relating to centrifugal fans
DE959583C (en) * 1955-01-15 1957-03-07 Babcock & Wilcox Dampfkessel W Changeable impeller for radial blower
US3171586A (en) * 1963-12-31 1965-03-02 Westinghouse Electric Corp Airfoil bladed fans
US3263963A (en) * 1964-11-05 1966-08-02 Worthington Corp Nozzle blade assembly comprising replaceable and adjustable nozzle blades
US3315941A (en) * 1965-04-27 1967-04-25 Rolls Royce Aerofoil blade for use in a hot fluid stream
US3398883A (en) * 1966-09-06 1968-08-27 Chicago Blower Corp Fan
US3426965A (en) * 1967-01-10 1969-02-11 American Standard Inc Centrifugal fan having removable blade section

Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4090813A (en) * 1975-05-14 1978-05-23 Hitachi, Ltd. High-efficiency turbo-machine impellers
US4022540A (en) * 1975-10-02 1977-05-10 General Electric Company Frangible airfoil structure
US4556364A (en) * 1981-07-23 1985-12-03 D. Wickham And Company Limited Centrifugal pumps
US4565495A (en) * 1983-08-11 1986-01-21 Electric Power Research Institute, Inc. Armoring system for an airfoil centrifugal fan
US4738594A (en) * 1986-02-05 1988-04-19 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Blades for axial fans
US4874293A (en) * 1988-11-08 1989-10-17 Gutzwiller H Leslie Modified centrifugal airfoil fan wheel
US4993918A (en) * 1989-05-19 1991-02-19 United Technologies Corporation Replaceable fairing for a turbine exhaust case
US5427503A (en) * 1991-03-15 1995-06-27 Toto Ltd. Multi-stacked circular plate fan provided with blades
US5358379A (en) * 1993-10-27 1994-10-25 Westinghouse Electric Corporation Gas turbine vane
AU672922B2 (en) * 1993-10-27 1996-10-17 Westinghouse Electric Corporation Gas turbine vane
US5693992A (en) * 1993-12-28 1997-12-02 Mitsubishi Denki Kabushiki Kaisha Cooling fan structure for AC generator
US6707181B1 (en) * 2002-11-15 2004-03-16 Visteon Global Technologies, Inc. Alternator fan
EP1489264A1 (en) * 2003-06-18 2004-12-22 Siemens Aktiengesellschaft Blade consisting of moduls
US20090252612A1 (en) * 2003-06-18 2009-10-08 Fathi Ahmad Blade and gas turbine
WO2007037699A1 (en) * 2005-09-27 2007-04-05 Umoe Mandal As Centrifugal fan
US20080232967A1 (en) * 2005-09-27 2008-09-25 Umoe Mandal As Centrifugal Fan
NO338320B1 (en) * 2005-09-27 2016-08-08 Umoe Mandal As centrifugal
US8133009B2 (en) 2005-09-27 2012-03-13 Umoe Mandal As Centrifugal fan
US20070140859A1 (en) * 2005-12-21 2007-06-21 Karl Schreiber Leading edge configuration for compressor blades of gas turbine engines
US7744346B2 (en) * 2005-12-21 2010-06-29 Rolls-Royce Deutschland Ltd & Co Kg Leading edge configuration for compressor blades of gas turbine engines
US20090047133A1 (en) * 2006-03-08 2009-02-19 Daikin Industries, Ltd. Impeller blade for centrifugal blower, blade-supporting rotator, impeller for centrifugal blower, and method for manufacturing impeller for centrifugal blower
US8732948B2 (en) 2006-03-08 2014-05-27 Daikin Industries, Ltd. Method of manufacturing impeller for centrifugal blower
US9022731B2 (en) 2009-11-03 2015-05-05 Alessandro Seccareccia Centrifugal ceiling fan
US9829009B2 (en) 2009-11-03 2017-11-28 P.A.C. International Inc. Centrifugal ceiling fan
US20130119796A1 (en) * 2010-08-04 2013-05-16 Mitsubishi Electric Corporation Rotary electric machine
US9013077B2 (en) * 2010-08-04 2015-04-21 Mitsubishi Electric Corporation Rotary electric machine
FR2988785A1 (en) * 2012-03-28 2013-10-04 Snecma Blade for double flow turboshaft engine, has reinforcement extended into longitudinal dimension from edge, where reinforcements include anchoring units and/or fixing units for fixing reinforcements on blade
US20150026980A1 (en) * 2012-03-28 2015-01-29 Snecma Method for disassembling a reinforcement from a part
US9920631B2 (en) * 2012-03-28 2018-03-20 Snecma Method for disassembling a reinforcement from a part
EP2848817A3 (en) * 2013-09-12 2015-08-05 Mitsubishi Electric Corporation Centrifugal fan and air-conditioning apparatus
CN107401525A (en) * 2016-04-20 2017-11-28 庞克有限公司 Formed blades and blast fan
CN107401525B (en) * 2016-04-20 2021-01-12 庞克有限公司 Formed blade and fan impeller
US20210227718A1 (en) * 2020-01-16 2021-07-22 Champ Tech Optical (Foshan) Corporation Heat dissipation fan of electronic device
CN112901279A (en) * 2021-01-29 2021-06-04 大连理工大学 Turbine blade adopting bolt-fixed ceramic armor
CN112901279B (en) * 2021-01-29 2022-03-29 大连理工大学 Turbine blade adopting bolt-fixed ceramic armor

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Publication number Publication date
JPS5065005U (en) 1975-06-12
JPS5325844Y2 (en) 1978-07-01
CA979868A (en) 1975-12-16
GB1477056A (en) 1977-06-22

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Effective date: 19841219