EP0524863A1 - Hélice de ventilateur - Google Patents

Hélice de ventilateur Download PDF

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Publication number
EP0524863A1
EP0524863A1 EP92402064A EP92402064A EP0524863A1 EP 0524863 A1 EP0524863 A1 EP 0524863A1 EP 92402064 A EP92402064 A EP 92402064A EP 92402064 A EP92402064 A EP 92402064A EP 0524863 A1 EP0524863 A1 EP 0524863A1
Authority
EP
European Patent Office
Prior art keywords
blades
ferrule
assembly
propeller
propeller according
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.)
Withdrawn
Application number
EP92402064A
Other languages
German (de)
English (en)
French (fr)
Inventor
Bernard Michel
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.)
Renault Trucks SAS
Original Assignee
Renault Vehicules Industriels SA
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 Renault Vehicules Industriels SA filed Critical Renault Vehicules Industriels SA
Publication of EP0524863A1 publication Critical patent/EP0524863A1/fr
Withdrawn legal-status Critical Current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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/326—Rotors specially for elastic fluids for axial flow pumps for axial flow fans comprising a rotating shroud

Definitions

  • Axial propeller fans are used in multiple applications whenever it is necessary to obtain air mixing.
  • it is conventional to accelerate the heat exchanges of the radiator or of the water / air heat exchanger, by placing in front of it. a propeller fan.
  • the propellers of these fans generally comprise a plurality of blades integral with a central hub which can be fixed by any suitable means on an axis driven in rotation.
  • Such a fan is significantly improved by having a cylindrical ferrule around the blades.
  • a ferrule can be fixed, the fan being driven in rotation inside the ferrule, leaving a gap between the end of the rotating blades and the fixed ferrule.
  • aerodynamic performance is obtained, which is clearly superior, as well as better performance and a lower noise level when the shell is integral with the blades. This is called a rotating ferrule, this being driven in rotation with the blades of the fan.
  • Rotating shrouds for propeller fans are currently produced in two ways.
  • the different blades of the fan propeller as well as the ferrule are obtained directly by molding a synthetic material.
  • the manufacture of such a fan propeller has drawbacks. in fact, the shell being integrated into the propeller manufacturing mold, it is necessary to provide as many molds as there are propeller diameters.
  • the blades of the fan propeller are made of metal, in particular light metal such as aluminum.
  • the rotating ferrule is then welded to the ends of the different blades of the propeller.
  • such an embodiment has the disadvantage of significantly increasing the complexity and the duration of manufacture.
  • the propeller fitted with its rotating ferrule welded has a significant weight which limits the operating characteristics of the fan.
  • the subject of the present invention is a fan propeller which eliminates the drawbacks of the embodiments of the prior art and which in particular makes it possible to simplify the manufacture and simply authorizes the production of a plurality of propellers of different diameters comprising each a rotating ferrule from a single type of large diameter propeller.
  • the invention thus allows the manufacture by molding of synthetic material in a single mold of the blades and of the central hub of a propeller which can be used in fans of different diameters.
  • the fan propeller according to the invention comprises a plurality of blades secured to a central hub and a rotating external cylindrical shell connecting the ends of the blades to each other.
  • the ferrule is a separate part from the assembly formed by the blades and the central hub and the blades are tightened with a circumferential and angular stress inside the ferrule so as to form an assembly.
  • the fitting of the attached ferrule with prestressed blades increases the mechanical strength of the blades, in particular by radial tightening of the latter.
  • the assembly of the ferrule with the blades can be completed, in an advantageous embodiment, by studs provided at the ends of at least some of the blades and cooperating with corresponding recesses made on the ferrule.
  • the pins can be provided in the vicinity of an edge of the respective blades, the shell then having recesses in the form of an open slot.
  • the studs can be provided in the central part of the respective blades, the ferrule then comprising recesses in the form of a through orifice.
  • the assembly formed by the blades and the central hub is obtained by molding a synthetic material.
  • the ferrule can be a closed part obtained by any suitable manufacturing process, for example by molding or stamping. It can be made of synthetic material of suitable rigidity or of metal, for example of light metal such as aluminum.
  • the ferrule can also be produced using one or more portions of strip wound, for example of aluminum, the ends of which are joined together to form a closed circumference.
  • the ferrule can be cut from a metal strip and then bent on the propeller, the ends of the strip being assembled after bringing together the prestressing of the blades. The assembly can be done by welding or by an appropriate device for hanging the ends of the strip.
  • the fan propeller according to the invention comprises four blades 1 secured to a central hub 2 the assembly being produced by molding a synthetic material.
  • An external cylindrical shell 3 produced here by way of example in aluminum is made integral with the ends of the blades 1 so as to constitute a rotating ferrule.
  • the ferrule 3 is a cylindrical part obtained for example by stamping.
  • the assembly of the ferrule 3 with the ends of the blades 1 is completed by studs 4 provided in the vicinity of an edge of each blade 1.
  • the studs 4 are inserted in open slots 5 in the form of an open slot provided on one of the edges of the periphery of the ferrule 3.
  • the ferrule 3 has a profile which is convex inwards, the assembly therefore having a toroidal shape improving the aerodynamic characteristics of the fan.
  • the assembly consisting of the blades 1 and the hub 2 is made of synthetic resin or any other light moldable material.
  • the total dimensions of the blades 1 can be greater than those of the propeller illustrated in FIGS. 1 to 3. In this case it suffices, in order to obtain the desired diameter, to cut the ends of the blades 1 while leaving the studs 4. This cutting is particularly easy to practice when using a synthetic material.
  • the ferrule is itself independently produced, for example from aluminum, and, in the illustrated embodiment, in the form of a closed cylindrical part.
  • the blades 1 are subjected to a bending force by means of a press.
  • the press can for example come to bear axially on the hub 2 while the ends of the blades are held in position. Taking into account the flexibility of the material used for the production of the blades 1 these are arched and it becomes possible, by taking advantage of the reduction in the total diameter of the propeller, to introduce it inside the ferrule 3.
  • the force exerted on the blades which are automatically assembled with a stress is released, preventing any risk of play in operation.
  • This constraint is preferably created both along the circumference, the diameter of the propeller before mounting in the ferrule being greater than the diameter of the ferrule and in an angular direction causing a torsional stress of the different blades 1.
  • the end of the blade 1 illustrated in FIG. 2 is therefore forcibly tightened against the bore of the ferrule 3.
  • one of the faces of the tenon 4 is tightened on the edge of the slot 5 on which it comes to support.
  • the ferrule is initially cut in the form of a metal strip and then bent on the propeller, the tightening realizing the constraints mentioned above.
  • the ends of the strip can be fixed by welding or by snap-fastening or any other suitable means.
  • the tenons 4 penetrate into recesses 6 in the form of through orifices made at appropriate locations on the periphery of the shell 3 and rest on one of the edges of the recesses 6.
  • the invention can be advantageously applied in particular to the production of a cooling fan for an internal combustion engine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP92402064A 1991-07-26 1992-07-17 Hélice de ventilateur Withdrawn EP0524863A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9109523A FR2679606A1 (fr) 1991-07-26 1991-07-26 Helice de ventilateur.
FR9109523 1991-07-26

Publications (1)

Publication Number Publication Date
EP0524863A1 true EP0524863A1 (fr) 1993-01-27

Family

ID=9415605

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92402064A Withdrawn EP0524863A1 (fr) 1991-07-26 1992-07-17 Hélice de ventilateur

Country Status (2)

Country Link
EP (1) EP0524863A1 (ja)
FR (1) FR2679606A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996019670A2 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Domestic fan
WO1996019669A1 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Fan
EP0930420A1 (de) * 1998-01-14 1999-07-21 Asea Brown Boveri AG Herstellungsverfahren eines beschaufelten Düsenrings
WO2002016776A1 (en) * 2000-08-22 2002-02-28 Capstone Turbine Corporation Shrouded rotary compressor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639886A (en) * 1950-11-17 1953-05-26 Thompson Prod Inc Shrouded wheel
US2853140A (en) * 1956-01-03 1958-09-23 Brookside Products Company Inc Resiliently mounted impeller blades
US3201857A (en) * 1963-03-21 1965-08-24 Torrington Mfg Co Method of making fan with slinger ring
EP0096255A1 (de) * 1982-06-01 1983-12-21 Siemens Aktiengesellschaft Elektromotorisch angetriebener Axialventilator, insbesondere für Kraftfahrzeug-Kühlerventilatoren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639886A (en) * 1950-11-17 1953-05-26 Thompson Prod Inc Shrouded wheel
US2853140A (en) * 1956-01-03 1958-09-23 Brookside Products Company Inc Resiliently mounted impeller blades
US3201857A (en) * 1963-03-21 1965-08-24 Torrington Mfg Co Method of making fan with slinger ring
EP0096255A1 (de) * 1982-06-01 1983-12-21 Siemens Aktiengesellschaft Elektromotorisch angetriebener Axialventilator, insbesondere für Kraftfahrzeug-Kühlerventilatoren

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996019670A2 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Domestic fan
WO1996019669A1 (en) * 1994-12-22 1996-06-27 Helpman Intellectual Properties B.V. Fan
NL9402191A (nl) * 1994-12-22 1996-08-01 Helpman Intellectual Propertie Ventilator.
WO1996019670A3 (en) * 1994-12-22 1996-09-12 Helpman Intellectual Propertie Domestic fan
EP0930420A1 (de) * 1998-01-14 1999-07-21 Asea Brown Boveri AG Herstellungsverfahren eines beschaufelten Düsenrings
WO2002016776A1 (en) * 2000-08-22 2002-02-28 Capstone Turbine Corporation Shrouded rotary compressor

Also Published As

Publication number Publication date
FR2679606B1 (ja) 1995-06-02
FR2679606A1 (fr) 1993-01-29

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