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US3285502A - Balanced fan construction - Google Patents

Balanced fan construction Download PDF

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Publication number
US3285502A
US3285502A US427735A US42773565A US3285502A US 3285502 A US3285502 A US 3285502A US 427735 A US427735 A US 427735A US 42773565 A US42773565 A US 42773565A US 3285502 A US3285502 A US 3285502A
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United States
Prior art keywords
legs
spider
center
fan
angle
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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
US427735A
Inventor
John A Wooden
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Brookside Corp
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Brookside Corp
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Publication date
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Priority to US427735A priority Critical patent/US3285502A/en
Application granted granted Critical
Publication of US3285502A publication Critical patent/US3285502A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • 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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/328—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with unequal distribution of blades around the hub
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/662—Balancing of rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S416/00—Fluid reaction surfaces, i.e. impellers
    • Y10S416/50—Vibration damping features

Definitions

  • the primary object of the present invention is to provide a rotatable member such as a fan having a plurality of radially extending legs with the angle between the longitudinal axes of any two of said legs differing in magnitude from the angle between any other two of said legs, the angular spacing of the legs being such as to dynamically balance the member about its axis of rotation, whereby pulse rate frequency noise is minimized.
  • a rotatable member such as a fan having a plurality of radially extending legs with the angle between the longitudinal axes of any two of said legs differing in magnitude from the angle between any other two of said legs, the angular spacing of the legs being such as to dynamically balance the member about its axis of rotation, whereby pulse rate frequency noise is minimized.
  • the present invention is embodied in a rotatable member such as the fan spider 10.
  • the spider is provided with a central aperture 11 and a series of bolt holes 12 which permit the spider to be assembled with a pulley or other mounting structure.
  • Extending radially from the central portion of the spider are legs 13.
  • the legs 13 are enlarged somewhat and provided with rivet holes 14 to permit fan blades (not shown) to be attached to the enlarged portions of the legs.
  • the legs may be twisted or skewed in the intermediate area 16 to provide the proper pitch for the fan blades when mounted on the legs.
  • the legs are uniformly shaped so that their centers of gravity are uniformly spaced from the center of the spider.
  • the fan blades to be attached to the legs are, of course, also of uniform configuration and weight so that in the completed assembly the effective centers of gravity of the radially extending legs and the fan blades mounted thereon will be uniformly spaced about the center of the spider.
  • each of the legs is disposed so that the angle between the longitudinal axes of any two 3,285,502 Patented Nov. 15, 1966 of the legs differs in magnitude from the angle between the longitudinal axes of any other two of the legs.
  • the angular spacing of the legs is nonuniform, however, the spacing of the legs being such that the structure is dynamically balanced about the center of the spider. The spacing is such that this balance occurs automatically without the addition of weights to one or more of the legs, or the subtraction of weight from one or more of the legs.
  • the spider embodied in the present invention lends itself to mass production since it can be stamped or otherwise formed completely balanced and subtraction or addition of supplementary weights is not required for balancing the structure. Because of the staggered and unequally spaced legs on the spider objectionable and energy loss due to pulse rate frequency noise is minimized.
  • a fan spider having a plurality of radially extending legs, said legs each being adapted to have identical fan blades secured thereto, the angle between the longitudinal axes of any two of said legs diifering in magnitude from the angle between the longitudinal axes of any other two of said legs, the center of gravity of each of said legs being equidistant from the center of said spider, the angular spacing of said legs being such as to dynamically balance said spider about its center without the addition or subtraction of mass to or from said legs.
  • a rotatable member having a plurality of radially extending elements, the angle between the longitudinal axes of any two of said elements dififering in magnitude from the angle between the longitudinal axes of any other two of said elements, the center of gravity of each of said elements being equidistant from the axis of rotation of said member, the angular spacing of said elements being such as to dynamically balance said member about its axis of rotation without the addition or subtraction of mass to or from said elements.

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

Description

Nov. 15, 1966 J. A. WOODEN 3,285,502
BALANCED FAN CONSTRUCTION Filed Jan. 25, 1965 IN VENT 0R. JOHN A.WOODEN BY I WZ/WSM WM AHarneqs United States Patent 3,285,502 BALANCED FAN CONSTRUCTION John A. Wooden, Indianapolis, Ind., assignor to Brookside Corporation, McCordsville, Ind., a corporation of Indiana Filed Jan. 25, 1965, Ser. No. 427,735 2 Claims. (Cl. 230132) a This invention relates generally to air moving fans and particularly to a fan construction which minimizes pulse rate frequency noise and energy loss.
It has, in the past, been recognized that a member, such as a fan, rotating about a central axis and with equal spacing of its blades, will emit a definite tone or siren effect when obstructions are present in the air stream induced by the fan. Analysis of this noise tone indicates that it has a frequency equal to the product of the rpm. of the rotating member and the number of legs extending radially from the rotating member. In the trade the noise produced as referred to above is often identified as pulse rate frequency noise. It is, of couse, highly desirable that this noise, and consequent energy loss be minimized.
The primary object of the present invention is to provide a rotatable member such as a fan having a plurality of radially extending legs with the angle between the longitudinal axes of any two of said legs differing in magnitude from the angle between any other two of said legs, the angular spacing of the legs being such as to dynamically balance the member about its axis of rotation, whereby pulse rate frequency noise is minimized.
This and other objects will become apparent as the description proceeds with reference to the accompanying drawing showing a front view of a fan spider, the fan blades being omitted, which embodies the present invention.
Referring to the drawing, the present invention is embodied in a rotatable member such as the fan spider 10. The spider is provided with a central aperture 11 and a series of bolt holes 12 which permit the spider to be assembled with a pulley or other mounting structure. Extending radially from the central portion of the spider are legs 13.
At their outer ends the legs 13 are enlarged somewhat and provided with rivet holes 14 to permit fan blades (not shown) to be attached to the enlarged portions of the legs. The legs may be twisted or skewed in the intermediate area 16 to provide the proper pitch for the fan blades when mounted on the legs. It will be noted that the legs are uniformly shaped so that their centers of gravity are uniformly spaced from the center of the spider. The fan blades to be attached to the legs are, of course, also of uniform configuration and weight so that in the completed assembly the effective centers of gravity of the radially extending legs and the fan blades mounted thereon will be uniformly spaced about the center of the spider.
It will be noted that each of the legs is disposed so that the angle between the longitudinal axes of any two 3,285,502 Patented Nov. 15, 1966 of the legs differs in magnitude from the angle between the longitudinal axes of any other two of the legs. The angular spacing of the legs is nonuniform, however, the spacing of the legs being such that the structure is dynamically balanced about the center of the spider. The spacing is such that this balance occurs automatically without the addition of weights to one or more of the legs, or the subtraction of weight from one or more of the legs. The spider embodied in the present invention lends itself to mass production since it can be stamped or otherwise formed completely balanced and subtraction or addition of supplementary weights is not required for balancing the structure. Because of the staggered and unequally spaced legs on the spider objectionable and energy loss due to pulse rate frequency noise is minimized.
While the invention has been disclosed and described in some detail in the drawings and foregoing description, they are to be considered as illustrative and not restrictive in character, as other modifications may readily suggest themselves to persons skilled in this are and within the broad scope of the invention, reference being bad to the appended claims.
The invention claimed is:
1. A fan spider having a plurality of radially extending legs, said legs each being adapted to have identical fan blades secured thereto, the angle between the longitudinal axes of any two of said legs diifering in magnitude from the angle between the longitudinal axes of any other two of said legs, the center of gravity of each of said legs being equidistant from the center of said spider, the angular spacing of said legs being such as to dynamically balance said spider about its center without the addition or subtraction of mass to or from said legs.
2. A rotatable member having a plurality of radially extending elements, the angle between the longitudinal axes of any two of said elements dififering in magnitude from the angle between the longitudinal axes of any other two of said elements, the center of gravity of each of said elements being equidistant from the axis of rotation of said member, the angular spacing of said elements being such as to dynamically balance said member about its axis of rotation without the addition or subtraction of mass to or from said elements.
References Cited by the Examiner UNITED STATES PATENTS 1,525,814 2/1925 Lasche 25339 1,868,008 7/1932 Gardner 230-- 3,006,603 10/1961 Caruso et a1. 25339 FOREIGN PATENTS 79,778 8/ 1955 Denmark. 768,037 5/1955 Germany. 421,964 1/1935 Great Britain.
MARTIN P. SCHWADRON, Primary Examiner.
HENRY F. RADUAZO, Examiner.

Claims (1)

1. A FAN SPIDER HAVING A PLURALITY OF RADIALLY EXTENDING LEGS, SAID LEGS EACH BEING ADAPTED TO HAVE IDENTICAL FAN BLADES SECURED THERETO, THE ANGLE BETWEEN THE LONGITUDINAL AXES OF ANY TWO OF SAID LEGS DIFFERING IN MAGNITUDE FROM THE ANGLE BETWEEN THE LONGITUDINAL AXES OF ANY OTHER TWO OF SAID LEGS, THE CENTER OF GRAVITY OF EACH OF SAID LEGS BEING EQUIDISTANT FROM THE CENTER OF SAID SPIDER, THE ANGULAR SPACING OF SAID LEGS BEING SUCH AS TO DYNAMICALLY BALANCE SAID SPIDER ABOUT ITS CENTER WITHOUT THE ADDITION OR SUBTRACTION OF MASS TO OR FROM SAID LEGS.
US427735A 1965-01-25 1965-01-25 Balanced fan construction Expired - Lifetime US3285502A (en)

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Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628888A (en) * 1970-02-24 1971-12-21 Brookside Corp Light weight fan assembly
JPS4950810U (en) * 1972-08-08 1974-05-04
US4132504A (en) * 1976-04-07 1979-01-02 General Signal Corporation Liquid ring pump
US4273515A (en) * 1976-04-07 1981-06-16 General Signal Corporation Liquid ring pump
US5505590A (en) * 1994-04-26 1996-04-09 Freudenberg-Nok General Partnership Composite torque converter components
US5588618A (en) * 1994-05-04 1996-12-31 Eurocopter France Counter-torque device with rotor and flow-straightening stator, both of which are ducted, and phase modulation of the blades of the rotor, for helicopter
US5634611A (en) * 1994-05-04 1997-06-03 Eurocopter France Counter-torque device with rotor and flow straightening stator, both of which are ducted, and inclined flow-straightening vanes
US20020197162A1 (en) * 2000-04-21 2002-12-26 Revcor, Inc. Fan blade
US20030223875A1 (en) * 2000-04-21 2003-12-04 Hext Richard G. Fan blade
US20040101407A1 (en) * 2002-11-27 2004-05-27 Pennington Donald R. Fan assembly and method
US20090014581A1 (en) * 2004-07-16 2009-01-15 Bell Helicopter Textron Inc. Counter-Torque Device for a Helicopter
US20180187699A1 (en) * 2016-12-30 2018-07-05 Asustek Computer Inc. Centrifugal fan
EP2122182B1 (en) * 2007-02-23 2019-05-01 SEW-EURODRIVE GmbH & Co. KG Ventilator wheel, system and transmission line

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1525814A (en) * 1923-10-31 1925-02-10 Aeg Construction of elastic-fluid turbines to prevent breakage of blades due to vibrations
US1868008A (en) * 1931-04-04 1932-07-19 Automotive Fan & Bearing Co Fan
GB421964A (en) * 1933-11-09 1935-01-02 Sulzer Ag Improvements in or relating to rotary pumps
DE768037C (en) * 1940-02-11 1955-05-26 Messerschmitt Boelkow Blohm Impeller for gas turbines with intermittent supply of propellant
US3006603A (en) * 1954-08-25 1961-10-31 Gen Electric Turbo-machine blade spacing with modulated pitch

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1525814A (en) * 1923-10-31 1925-02-10 Aeg Construction of elastic-fluid turbines to prevent breakage of blades due to vibrations
US1868008A (en) * 1931-04-04 1932-07-19 Automotive Fan & Bearing Co Fan
GB421964A (en) * 1933-11-09 1935-01-02 Sulzer Ag Improvements in or relating to rotary pumps
DE768037C (en) * 1940-02-11 1955-05-26 Messerschmitt Boelkow Blohm Impeller for gas turbines with intermittent supply of propellant
US3006603A (en) * 1954-08-25 1961-10-31 Gen Electric Turbo-machine blade spacing with modulated pitch

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3628888A (en) * 1970-02-24 1971-12-21 Brookside Corp Light weight fan assembly
JPS4950810U (en) * 1972-08-08 1974-05-04
US4132504A (en) * 1976-04-07 1979-01-02 General Signal Corporation Liquid ring pump
US4273515A (en) * 1976-04-07 1981-06-16 General Signal Corporation Liquid ring pump
US5505590A (en) * 1994-04-26 1996-04-09 Freudenberg-Nok General Partnership Composite torque converter components
US5588618A (en) * 1994-05-04 1996-12-31 Eurocopter France Counter-torque device with rotor and flow-straightening stator, both of which are ducted, and phase modulation of the blades of the rotor, for helicopter
US5634611A (en) * 1994-05-04 1997-06-03 Eurocopter France Counter-torque device with rotor and flow straightening stator, both of which are ducted, and inclined flow-straightening vanes
US20050123404A1 (en) * 2000-04-21 2005-06-09 Revcor, Inc. Fan blade
US20020197162A1 (en) * 2000-04-21 2002-12-26 Revcor, Inc. Fan blade
US20030223875A1 (en) * 2000-04-21 2003-12-04 Hext Richard G. Fan blade
US6712584B2 (en) 2000-04-21 2004-03-30 Revcor, Inc. Fan blade
US6814545B2 (en) 2000-04-21 2004-11-09 Revcor, Inc. Fan blade
US20040101407A1 (en) * 2002-11-27 2004-05-27 Pennington Donald R. Fan assembly and method
US6942457B2 (en) 2002-11-27 2005-09-13 Revcor, Inc. Fan assembly and method
US20060088418A1 (en) * 2002-11-27 2006-04-27 Revcor, Inc. Fan assembly and method
US20090014581A1 (en) * 2004-07-16 2009-01-15 Bell Helicopter Textron Inc. Counter-Torque Device for a Helicopter
US8286908B2 (en) * 2004-07-16 2012-10-16 Bell Helicopter Textron Inc. Counter-torque device for a helicopter
US8640984B2 (en) 2004-07-16 2014-02-04 Bell Helicopter Textron Inc. Counter-torque device for a helicopter
EP2122182B1 (en) * 2007-02-23 2019-05-01 SEW-EURODRIVE GmbH & Co. KG Ventilator wheel, system and transmission line
US20180187699A1 (en) * 2016-12-30 2018-07-05 Asustek Computer Inc. Centrifugal fan
US10519979B2 (en) * 2016-12-30 2019-12-31 Asustek Computer Inc. Centrifugal fan

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