US3360051A - Propeller fans with variable-pitch blades - Google Patents

Propeller fans with variable-pitch blades Download PDF

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Publication number
US3360051A
US3360051A US612239A US61223967A US3360051A US 3360051 A US3360051 A US 3360051A US 612239 A US612239 A US 612239A US 61223967 A US61223967 A US 61223967A US 3360051 A US3360051 A US 3360051A
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US
United States
Prior art keywords
propeller
pitch
hub
axis
ventilator
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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
US612239A
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English (en)
Inventor
Achille Maurice Marie
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.)
CALOR APP ELECTRO DOMESTIQUES
CALOR APPAREILS ELECTRO-DOMESTIQUES
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CALOR APP ELECTRO DOMESTIQUES
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Filing date
Publication date
Application filed by CALOR APP ELECTRO DOMESTIQUES filed Critical CALOR APP ELECTRO DOMESTIQUES
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Publication of US3360051A publication Critical patent/US3360051A/en
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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
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F04D29/362—Blade mountings adjustable during rotation

Definitions

  • the invention essentially relates to a propeller fan of a variable-pitch type, more particularly adapted for home use, and wherein the propeller blades are rotatively mounted on pivot pins substantially at right angles to the rotational axis to the propeller and journalled in bearings provided in the propeller-driving hub; said pivot pins are solid with stud means shifted in relation to the rotational axis of said pivot pins, said stud means engaged by a propeller-pitch controlling member presenting an annular configuration and freely sliding along the longitudinal direction of the fan-driving shaft.
  • the propeller fan comprises two annular members mounted and freely rotating around said fan-driving shaft located and pressed between said controlling member and the fixed frame structure of the fan, said annular members forming between them at least one cam face and being relatively rotated around the rotational axis of said propeller, a control arm member being provided and associated with at least one of said annular members.
  • the present invention has essentially for its object a propeller fan of the variable-pitch type, adapted more particularly for home use.
  • fans for home use are driven by single-phase asynchronous electromotors of the split pole type and these motors operate satisfactorily only at a well-defined speed value; under these conditions, it is not possible to properly vary the air fiow produced by these fans by simply altering the propeller speed. Therefore, if it is desired to vary the air delivery of a fan of this type, a variable pitch propeller must be used. In this case a constructional complication arises and as a rule in known light apparatus it is not possible to modify the pitch angel of the propeller blades during the fan operation.
  • a fan according to this invention is of the type wherein the propeller blades are rotatably mounted on pivot pins disposed substantially at right angles to the rotational axis of the propeller and journalled in bearings provided within the propeller-driving hub; these pivot pins are solid with studs or the like, which are shifted in relation to the axis of rotation of said pivot pins; said studs are driven into a translatory motion parallel to the rotational axis of the propeller and also kept in proper position by means of a propellerpitch controlling member which presents an annular configuration and slides with a certain play along the fandriving shaft.
  • Another feature of the fan is to comprise two annular members mounted around the propeller-driving shaft, said shaft being left to rotate freely within said Patented Dec. 26, 1967 ICC annular members, these said annular members are located and pressed between said propeller-pitch controlling member and the fixed frame structure of the fan, and said annular members form between them at least one cam face and may possibly be driven into a relative rotation around the rotational axis of the propeller by means of a control arm or the like, solid with at least one of said annular members.
  • one of the aforementioned annular members is fixed in regard to the frame structure of the fan, the second being mobile according to a rotation determined by said control arm, thus allowing variations in the pitch of the propeller.
  • the aforementioned fixed annular member comprises said cam faces forming an annular cam; the second annular member is mounted in an intermediate position between said cam and said controlling member which allows variations in the pitch of the propeller.
  • a slip ring or the like is inserted between said pitch controlling member and said intermediate member.
  • said intermediate member cannot revolve bodily with the propeller and the friction member interposed between said member and the member controlling the pitch angle will reduce to a suitable value the frictional forces tending to counteract the propeller rotation due to the axial reaction force urging the propeller against said friction member.
  • variable pitch angle system notably the hub, the blade pivot pins rigid with their studs, the control cam, etc. consist of moulded synthetic material such as notably injection-moulded thermoplastic material.
  • FIGURE 1 is an axial sectional view with parts broken away showing the fan propeller and a device for controlling the pitch angle variation according to the teachings of this invention
  • FIGURE 2 is a view similar to FIGURE 1 from which the various component elements of the pitch angle control system have been removed; this figure is substantially a section taken upon the line IIII of FIGURE 3;
  • FIGURE 3 is a sectional view of the propeller, with parts broken away and taken substantially along the line IIIIII of FIGURE 2, and
  • FIGURE 4 is a perspective exploded view of two component elements forming part of the propeller variable pitch-angle device illustrated in FIGURE 1.
  • This shaft 3 is rotatably driven from a conventional electromotor (not shown).
  • the hub 2 is rigidly assembled with the shaft 3 for example by means of a set screw 4 and a socket 5 fitting on the outer end 3a of shaft 3.
  • Each blade 1 is mounted on the hub 2 by means of a pivot pin 6 journalled in a bearing consisting of a pair of aligned holes 7, 8 formed in the hub 2. More particularly the holes 7 are formed in the casing 2a of hub 2 and the other holes 8 are formed in lugs 2b formed integrally 3 with the hub 2 and extending within the casing 2a parallel to the hub axis.
  • the pivot pins 6 are rigid with projections such as studs, fingers or the like 9 (see FIGURE 3) which are shifted in relation to the axes of rotation of said pivot pins 6 in bearings '7, 8.
  • the studs 9 engage fork-shaped notches 10 formed in an annular member 11 adapted to move in a direction parallel to the axis of rotation of shaft 3.
  • This member 11 is adapted to slide with a small clearance on said shaft 3 due to its central bore 12.
  • the member 11 of course rotates bodily with the shaft 3, hub 2 and blades 1 of the propeller.
  • the friction socket 13 engages an inner shoulder 14a of an annular member 14 shown more clearly in FIG- URE 4.
  • the member 14 has a cylindrical configuration with a bore 15 fitting with a certain play on the shaft 3 and three radial arms 16.
  • One arm 16 is rigid with a control lever 17.
  • These arms 16 of socket 14 engage cam faces 18 formed in a second annular member forming cam 19 rigid with the frame structure 20 of the fan.
  • This cam member 19 comprises a central bore 21 permitting the frictionless passage of shaft 3.
  • the cylindrical journal surface 14b of socket 14 slidably engages a bore 22 of corresponding diameter formed in cam member 19.
  • the apparatus is assembled as follows:
  • the parts 19, 14 and 13 are slipped thereon in succession.
  • the various pivot pins 6 are properly positioned in the hub bearings 7 and 8, whereafter the blades 1 are secured by inserting them into the splits ends of said pivot pins 6 which are thus caused to straddle the relevant edge of the corresponding blade.
  • These pivot pins 6 are cemented or welded on the blades.
  • the blades 1 are properly inclined and each stud 9 is engaged into the corresponding form 10 of member 11, and the resulting assembly is engaged on the free end of shaft 3.
  • the hub 2 is secured on shaft 3 by means of the set screw 4.
  • the number of arms 16 may be modified and the cam faces 18 may be formed on member 14 instead of member 19, and on the other hand the radial arms 16 may be rigid with member 19 instead of member 14.
  • the cam face 18 is notched, each notch corresponding to a predetermined pitch angle.
  • this cam face 18 may be smooth and in this case some detent-positioning means must be provided to retain the control lever 17 in the selected pitch position.
  • the greater part or the whole of the component elements of the device described hereinabove are made of synthetic moulded material such as an injection-moulded thermoplastic material.
  • a ventilator more particularly adapted for home use, of adjustable pitch propeller type comprising a fixed frame structure, a rotatable driving hub, pivot pins, adjustable pitch propeller blades rotatively mounted on said pivot pins substantially at right angles to the rotational axis of said hub, stub means shifted in relation to the rotational axis of said pivot pins, said pivot pins being solid with said stud means, a propeller pitch controlling member engaging said stud means and presenting an annular configuration and freely sliding around said hub and along the axis of said ventilator, two annular members mounted around said hub which freely rotates therein, said annular members being located and pressed between said pitch controlling member and said fixed frame structure, cam face means provided between said annular members, the first one of said annular members being fixed in regard to said frame structure, the second one being rotatively movable around the ventilator axis and a control arm member associated with said second one of said annular members, whereby on rotation of said arm member around the ventilator axis said second member rotate
  • a ventilator according to claim 2 including arms solid with said second annular member and wherein said cam faces are notched and are abutted against said arms, each of said arms engaging one notch of said cam face, according to the position of said control arm member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US612239A 1966-02-01 1967-01-27 Propeller fans with variable-pitch blades Expired - Lifetime US3360051A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR47983A FR1494085A (fr) 1966-02-01 1966-02-01 Ventilateur à hélice à pas variable

Publications (1)

Publication Number Publication Date
US3360051A true US3360051A (en) 1967-12-26

Family

ID=8600248

Family Applications (1)

Application Number Title Priority Date Filing Date
US612239A Expired - Lifetime US3360051A (en) 1966-02-01 1967-01-27 Propeller fans with variable-pitch blades

Country Status (6)

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US (1) US3360051A (en)van)
BE (1) BE693347A (en)van)
DE (1) DE1958560U (en)van)
ES (1) ES336252A1 (en)van)
FR (1) FR1494085A (en)van)
GR (1) GR33079B (en)van)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4832573A (en) * 1987-11-27 1989-05-23 General Motors Corporation Integral connection for plastic water pump impeller
EP0277906A3 (en) * 1987-02-02 1990-01-31 United Technologies Corporation Composite disk for supporting fan blades

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4221541A (en) * 1977-02-28 1980-09-09 Axial International Aktiengesellschaft Fan comprising a blade pitch control mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2360571A (en) * 1942-11-30 1944-10-17 Donald E Meehan Propeller
US2792897A (en) * 1951-07-13 1957-05-21 Svenska Flaektfabriken Ab Device for reversing fan blades
US2851114A (en) * 1949-06-20 1958-09-09 Allen M Rossman Adjustable pitch propeller

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2360571A (en) * 1942-11-30 1944-10-17 Donald E Meehan Propeller
US2851114A (en) * 1949-06-20 1958-09-09 Allen M Rossman Adjustable pitch propeller
US2792897A (en) * 1951-07-13 1957-05-21 Svenska Flaektfabriken Ab Device for reversing fan blades

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0277906A3 (en) * 1987-02-02 1990-01-31 United Technologies Corporation Composite disk for supporting fan blades
US4832573A (en) * 1987-11-27 1989-05-23 General Motors Corporation Integral connection for plastic water pump impeller

Also Published As

Publication number Publication date
DE1958560U (de) 1967-04-13
GR33079B (el) 1967-10-31
ES336252A1 (es) 1968-02-16
BE693347A (en)van) 1967-07-03
FR1494085A (fr) 1967-09-08

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