EP0553598B1 - Ventilateur avec pales convexes - Google Patents

Ventilateur avec pales convexes Download PDF

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Publication number
EP0553598B1
EP0553598B1 EP19920830038 EP92830038A EP0553598B1 EP 0553598 B1 EP0553598 B1 EP 0553598B1 EP 19920830038 EP19920830038 EP 19920830038 EP 92830038 A EP92830038 A EP 92830038A EP 0553598 B1 EP0553598 B1 EP 0553598B1
Authority
EP
European Patent Office
Prior art keywords
fan
blades
blade
rotation
hub
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
EP19920830038
Other languages
German (de)
English (en)
Other versions
EP0553598A1 (fr
EP0553598B2 (fr
Inventor
Alessandro Spaggiari
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.)
Spal SRL
Original Assignee
Spal SRL
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8212062&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0553598(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Spal SRL filed Critical Spal SRL
Priority to DE1992609484 priority Critical patent/DE69209484T3/de
Priority to ES92830038T priority patent/ES2087501T5/es
Priority to EP19920830038 priority patent/EP0553598B2/fr
Publication of EP0553598A1 publication Critical patent/EP0553598A1/fr
Publication of EP0553598B1 publication Critical patent/EP0553598B1/fr
Application granted granted Critical
Publication of EP0553598B2 publication Critical patent/EP0553598B2/fr
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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • 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

Definitions

  • the invention relates to a fan generating an axial flow and equipped with convex or backward-curved blades, that is, blades curved in the opposite direction to the rotation direction of the fan.
  • Fans in general comprise a plurality of blades radiating outwards from a hub, said blades moving in a perpendicular plane to the said hub which supports them.
  • Each blade has a transversal dimension which is practically flat, and is inclined in such a way as to form a certain angle with respect to the rotation plane of the said fan.
  • the inclination is such that, when the fan rotates, the blades generate an air flow which is parallel to the rotation axis of the hub.
  • the "simplest” fans have straight blades, that is with the central longitudinal line of each blade being straight in the sense that is develops radially with respect to the hub to which it is keyed.
  • the prior art teaches fans with curved blades having their median line curved in the rotation direction of the fan or in the opposite direction, realising in this way a gradual penetration of the fanning surface of the blades in the air.
  • Patent US-PS 4.358.245 teaches an axial fan whose blades are curved in the rotation direction of the fan, and have an angle which grows according to the diameter of the blade at a certain point with respect to the maximum diameter of the same blade. The blade angle increases in the final 30% of the blade itself.
  • Patent US-A 4,569,632 teaches a fan of the type described above, whose blades curve backwards, that is in the opposite direction to the rotation direction of the fan itself, and are oriented in an inclination ratio with respect to the rotation plane which ratio diminishes constantly as the radius of the blade increases in the final 30% of its length.
  • German utility patent DE-U-89 03 903 teaches another fan of the type described above, whose blades curve backwards, and the projections, on a plane perpendicular to the axis of rotation of the fan, of the front edge and the rear edge are defined, starting from the hub of the fan, by a first straight radial section until the 25% of the radial length of the blade and then by a second section following two circumference arcs.
  • the aim of the present invention is to structure an axial-flow fan of the convex-blade type or backward-curving type in which an efficacy-silence compromise is reached.
  • the axial flow fan according to the invention is denoted by 1 and comprises a central hub 3 from which a plurality of blades 2 radiate out in angularly equidistanced radial directions.
  • the hub 3 is keyable on to a motor shaft (not illustrated)which places it in rotation about a common axis.
  • the blades 2 are of the convex type, curved backwards, that is, with their median lines curved in the opposite sense to the rotation direction of reciprocally connected by means of an external stiffening ring 4.
  • the blades 2 are also inclined with respect to the rotation direction of the fan 1 in such a way as to generate, during the said fan's 1 rotation, an air flow parallel to the common rotation axis.
  • the invention envisages that the maximum transversal dimension of the blades 2 is constant along their entire longitudinal development (see figures 3 and 4).
  • the twisting of the blades that is, the progressinve variation of the keying angle on the hub 3 starting from the said hub 3 towards the external ring 4, remains constant along the entire development of the blades 2 themselves, in the sense that the derivative calculated in successive points along the longitudinal development of the blade 2 defines a constantly varying angular coefficient at point after point.
  • each blade 2 is structured as if it had been cut out of a straight blade in which each of its transversal sections had been made to slide on to the immediately contiguous transversal section.
  • the present fan thus reaches the proposed aims of silence, thanks to the backwards curvature of the blades 2, and of high performance, thanks to the substantial conformation of the same blades 2 which is comparable to the performance of straight blades.

Landscapes

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

Claims (3)

  1. Un ventilateur axial avec les pales incurvées dans la direction inverse de la direction de rotation du ventilateur, constitué d'un pivot (3), à partir duquel les pales (2) rayonnent vers l'extérieur jusqu'à un cercle de renforcement externe (4), lesdites pales ayant une section formant un profil aérodynamique, caractérisé en ce que la corde (L) de chaque pale est constante sur la direction radiale du ventilateur.
  2. Un ventilateur axial selon la revendication 1, caractérisé en ce que les projections, sur un plan perpendiculaire à l'axe de rotation du ventilateur, des bords avant ou d'entrée (5) de la pale (2) et des bords arrière ou de sortie (6) de la pale (2) sont définis par deux arcs de cercle.
  3. Un ventilateur axial selon la revendication 1, caractérisé en ce que lesdites pales (2) présentent un pivotement ou, plus précisément, une variation progressive de l'angle d'attaque de la section aérodynamique de la pale, c'est-à-dire de l'angle formé par l'approche de la direction de l'air et la corde, en fonction du rayon du ventilateur, lequel pivotement est constant sur tout son développement longitudinal vers le cercle externe(4).
EP19920830038 1992-01-30 1992-01-30 Ventilateur avec pales convexes Expired - Lifetime EP0553598B2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE1992609484 DE69209484T3 (de) 1992-01-30 1992-01-30 Lüfter mit konvexen Schaufeln
ES92830038T ES2087501T5 (es) 1992-01-30 1992-01-30 Un ventilador con palas convexas.
EP19920830038 EP0553598B2 (fr) 1992-01-30 1992-01-30 Ventilateur avec pales convexes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19920830038 EP0553598B2 (fr) 1992-01-30 1992-01-30 Ventilateur avec pales convexes

Publications (3)

Publication Number Publication Date
EP0553598A1 EP0553598A1 (fr) 1993-08-04
EP0553598B1 true EP0553598B1 (fr) 1996-03-27
EP0553598B2 EP0553598B2 (fr) 1998-11-25

Family

ID=8212062

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920830038 Expired - Lifetime EP0553598B2 (fr) 1992-01-30 1992-01-30 Ventilateur avec pales convexes

Country Status (3)

Country Link
EP (1) EP0553598B2 (fr)
DE (1) DE69209484T3 (fr)
ES (1) ES2087501T5 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945627A1 (fr) 1998-03-23 1999-09-29 SPAL S.r.l. Ventilateur à courant axial
US6350104B1 (en) 1998-07-28 2002-02-26 Valeo Thermique Moteur Fan blade
US6554574B1 (en) * 1998-03-23 2003-04-29 Spal S.R.L. Axial flow fan

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2723408A1 (fr) * 1994-08-03 1996-02-09 Licentia Gmbh Ventilateur axial, en particulier pour une soufflante de refroidissement d'un moteur de vehicule automobile.
CN1061417C (zh) * 1997-08-19 2001-01-31 吴凤清 自然风电风扇
ITBO20040417A1 (it) * 2004-07-06 2004-10-06 Spal Srl Ventola a flusso assiale
US7937775B2 (en) 2005-08-09 2011-05-10 Microtek Medical, Inc. Surgical protective head gear assembly including high volume air delivery system

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1218244A (fr) * 1958-03-05 1960-05-09 Ventilateur d'évacuation des copeaux pour machines-outils
FR1315717A (fr) * 1960-12-19 1963-01-25 Lyonnaise Ventilation Ventilateur hélicoïde perfectionné
US4358245A (en) * 1980-09-18 1982-11-09 Bolt Beranek And Newman Inc. Low noise fan
DE3220574A1 (de) * 1982-06-01 1983-12-01 Siemens AG, 1000 Berlin und 8000 München Leitradloser axialventilator, insbesondere fuer elektromotorisch angetriebene kraftfahrzeug-kuehlerventilatoren
US4569632A (en) * 1983-11-08 1986-02-11 Airflow Research And Manufacturing Corp. Back-skewed fan
DE3724319A1 (de) * 1987-07-22 1989-02-09 Klifa Gmbh & Co Luefterrad fuer ein kuehlgeblaese
IT214345Z2 (it) * 1988-04-01 1990-05-03 Magneti Marelli Spa Ventilatore assiale particolarmente per autoveicoli

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945627A1 (fr) 1998-03-23 1999-09-29 SPAL S.r.l. Ventilateur à courant axial
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
US6350104B1 (en) 1998-07-28 2002-02-26 Valeo Thermique Moteur Fan blade

Also Published As

Publication number Publication date
DE69209484T2 (de) 1996-09-05
ES2087501T3 (es) 1996-07-16
ES2087501T5 (es) 1999-04-16
DE69209484D1 (de) 1996-05-02
EP0553598A1 (fr) 1993-08-04
EP0553598B2 (fr) 1998-11-25
DE69209484T3 (de) 1999-04-01

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