EP0293825B1 - Axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles - Google Patents

Axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles Download PDF

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Publication number
EP0293825B1
EP0293825B1 EP19880108677 EP88108677A EP0293825B1 EP 0293825 B1 EP0293825 B1 EP 0293825B1 EP 19880108677 EP19880108677 EP 19880108677 EP 88108677 A EP88108677 A EP 88108677A EP 0293825 B1 EP0293825 B1 EP 0293825B1
Authority
EP
European Patent Office
Prior art keywords
cooling
radiator
blade
axial fan
internal combustion
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
Application number
EP19880108677
Other languages
German (de)
French (fr)
Other versions
EP0293825A1 (en
Inventor
Lorella Annovazzi
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.)
Industrie Magneti Marelli SRL
Original Assignee
Industrie Magneti Marelli 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
Application filed by Industrie Magneti Marelli SRL filed Critical Industrie Magneti Marelli SRL
Publication of EP0293825A1 publication Critical patent/EP0293825A1/en
Application granted granted Critical
Publication of EP0293825B1 publication Critical patent/EP0293825B1/en
Expired 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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form

Definitions

  • the present invention relates in general to axial fans intended to be used for cooling the radiator of the cooling system of internal combustion engines for motor vehicles.
  • the invention concerns an axial fan rotor of the type comprising a hub carrying a ring of radial blades, of the type generally known from GB-A-388991.
  • the object of the present invention is to produce an axial fan rotor of the above-specified type, having a conformation which provides improved performance in terms of efficiency and quietness of operation.
  • each blade has the following combination of characteristics:
  • an axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles is generally indicated 1.
  • the rotor 1 which is conveniently made in one piece from moulded plastics material, comprises a central hub 2 from which a circumferential ring of curved radial blades 3 extends.
  • each blade 3 has a leading edge 3a which, as can clearly be seen in Figures 3 and 4, is curved backwardly (i.e. is concave towards the rear end of the hub 2) and has a hyperbolic profile when viewed both from the side ( Figure 3) and from the front ( Figure 4).
  • the trailing edge 3b of each blade 3 is straight.
  • each blade 3 is keyed and the successive cylindrical sections of the blade are twisted in respect to the hub 2 varies hyperbolically in dependence on the radial co-ordinate of the blade.
  • This angle also named as "blade setting” is defined as the pitch angle of the cylindrical helix (corresponding to the chord of the developed profile) on the plane normal to the fan axis.
  • the fan according to the invention enables a better performance and quieter operation to be achieved in use, compared with conventional rotors.

Landscapes

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

Description

  • The present invention relates in general to axial fans intended to be used for cooling the radiator of the cooling system of internal combustion engines for motor vehicles.
  • More particularly, the invention concerns an axial fan rotor of the type comprising a hub carrying a ring of radial blades, of the type generally known from GB-A-388991.
  • The object of the present invention is to produce an axial fan rotor of the above-specified type, having a conformation which provides improved performance in terms of efficiency and quietness of operation.
  • According to the invention, this object is achieved by virtue of the fact that each blade has the following combination of characteristics:
    • the leading edge is curved backwardly and has a hyperbolic profile when viewed both from the front and from the side;
    • the trailing edge is straight, and
    • the angle of keying and twisting of succesive cylindrical sections of the blade in respect to the hub is a hyperbolic function of the radial co-ordinate of the blade.
  • The invention will now be described in detail with reference to the appended drawings, provided purely by way of non-limiting example, in which:
    • Figure 1 is a schematic perspective view of an axial fan rotor according to the invention,
    • Figure 2 is a view taken on the arrow II of Figure 1, on an enlarged scale,
    • Figure 3 is a view taken on the arrow III of Figure 1, on an enlarged scale, and
    • Figure 4 is a view taken on the arrow IV of Figure 1, on an enlarged scale.
  • With reference to the drawings, an axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles is generally indicated 1.
  • The rotor 1, which is conveniently made in one piece from moulded plastics material, comprises a central hub 2 from which a circumferential ring of curved radial blades 3 extends. According to the invention, each blade 3 has a leading edge 3a which, as can clearly be seen in Figures 3 and 4, is curved backwardly (i.e. is concave towards the rear end of the hub 2) and has a hyperbolic profile when viewed both from the side (Figure 3) and from the front (Figure 4). The trailing edge 3b of each blade 3 is straight.
  • Furthermore, the angle at which each blade 3 is keyed and the successive cylindrical sections of the blade are twisted in respect to the hub 2 varies hyperbolically in dependence on the radial co-ordinate of the blade. This angle, also named as "blade setting", is defined as the pitch angle of the cylindrical helix (corresponding to the chord of the developed profile) on the plane normal to the fan axis.
  • By virtue of the above-described conformation, the fan according to the invention enables a better performance and quieter operation to be achieved in use, compared with conventional rotors.

Claims (1)

  1. An axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles, including a hub carrying a ring of radial blades, characterised in that each blade (3) has the following combination of characteristics:
    - the leading edge (3a) is curved backwardly and has a hyperbolic profile when viewed both from the front and from the side;
    - the trailing edge (3b) is straight, and
    - the angle of keying and twisting of successive cylindrical sections of the blade in respect to the hub is a hyperbolic function of the radial co-ordinate of the blade (3).
EP19880108677 1987-06-03 1988-05-31 Axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles Expired EP0293825B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT5337287U IT210736Z2 (en) 1987-06-03 1987-06-03 AXIAL FAN IMPELLER FOR COOLING THE RADIATOR OF THE REFRIGERATION CIRCUIT OF AN INTERNAL COMBUSTION ENGINE FOR MOTOR VEHICLES
IT5337287U 1987-06-03

Publications (2)

Publication Number Publication Date
EP0293825A1 EP0293825A1 (en) 1988-12-07
EP0293825B1 true EP0293825B1 (en) 1991-09-25

Family

ID=11282223

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880108677 Expired EP0293825B1 (en) 1987-06-03 1988-05-31 Axial fan rotor for cooling the radiator of the cooling system of an internal combustion engine for motor vehicles

Country Status (4)

Country Link
EP (1) EP0293825B1 (en)
DE (1) DE3865098D1 (en)
ES (1) ES2024590B3 (en)
IT (1) IT210736Z2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104005992A (en) * 2013-02-22 2014-08-27 珠海格力电器股份有限公司 Axial-flow fan

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB388991A (en) * 1932-07-09 1933-03-09 Rene De Mey Improvements in or relating to screw fan blades
US2390879A (en) * 1940-09-21 1945-12-11 B F Sturtevant Co Propeller fan
DE2029021A1 (en) * 1970-06-12 1971-12-16 SWF-Spezialfabrik für Autozubehör Gustav Rau GmbH, 7120 Bietigheim Low-noise impeller for a blower

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104005992A (en) * 2013-02-22 2014-08-27 珠海格力电器股份有限公司 Axial-flow fan

Also Published As

Publication number Publication date
IT210736Z2 (en) 1989-01-11
EP0293825A1 (en) 1988-12-07
DE3865098D1 (en) 1991-10-31
ES2024590B3 (en) 1992-03-01
IT8753372V0 (en) 1987-06-03

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