EP2071193A1 - Bras composite pour pales de ventilateur axial - Google Patents

Bras composite pour pales de ventilateur axial Download PDF

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Publication number
EP2071193A1
EP2071193A1 EP07122730A EP07122730A EP2071193A1 EP 2071193 A1 EP2071193 A1 EP 2071193A1 EP 07122730 A EP07122730 A EP 07122730A EP 07122730 A EP07122730 A EP 07122730A EP 2071193 A1 EP2071193 A1 EP 2071193A1
Authority
EP
European Patent Office
Prior art keywords
shank
fan blades
composite
axial
ventilating fan
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Withdrawn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
EP07122730A
Other languages
German (de)
English (en)
Inventor
Ettore Giorgi
Marco Besani
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.)
Cofimco SRL
Original Assignee
Cofimco 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 Cofimco SRL filed Critical Cofimco SRL
Priority to EP07122730A priority Critical patent/EP2071193A1/fr
Priority to PCT/EP2008/067098 priority patent/WO2009074568A2/fr
Publication of EP2071193A1 publication Critical patent/EP2071193A1/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Withdrawn legal-status Critical Current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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
    • 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
    • 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
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/40—Organic materials
    • F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
    • F05D2300/603—Composites; e.g. fibre-reinforced
    • F05D2300/6034—Orientation of fibres, weaving, ply angle

Definitions

  • the present invention concerns a shank for supporting the blades of a fan, in particular axial fans used in industry.
  • axial fans are mainly used in large heat exchangers, condensers, cooling towers and similar applications, their purpose being to cool down water, steam or other types of fluids.
  • the axial fan is placed below or above the heat exchanger, the blades of the fan lying on an horizontal plan, and their diameter ranges up to 12-13 meters (42 feet).
  • the fan is influenced by the weight of the shank-blade block.
  • the weight of the shank-blade block tends to bend downwardly the shank which connects the blade to the fan's hub, proportionally to the flexibility of the shank.
  • the fan is influenced by the vibrations consequent to the rotation of the blades.
  • the centrifugal force is a function of the weight and of the rotational velocity of the fan.
  • the air load is a function of the rotational speed and of the wing airfoil.
  • a first kind of known fan realizes the blade and the shank in one single element made of fibreglass.
  • the first drawback of the shank-blade block made of fibreglass consists in that it is a rigid system.
  • Another kind of known fan realizes a rigid link between the blade and the hub by means of a shank made of steel associated with an extruded aluminium blade.
  • the steel shank is subject to mechanical fatigue. Due to the horizontal position of the fan and to the rigidity of the shank-blade group, the air load acting on the blade cooperates with the weight of the shank-blade group resulting in shank bending. One side of the pipe is compressed and the opposite side is extended, the bending forces acting on the shank during the fan functioning resulting in fatigue stress of the pipe.
  • the aim of the present invention is to provide a shank for axial fan blades suitable to overcome the drawback afflicting the known solutions.
  • one object of the present invention is to provide a shank for axial fan blades with improved flexibility in order to realize a flexible link between the blade and the fan hub.
  • Another object of the present invention is to provide a shank for axial fan blades with improved resistance to chemical attack, thus to improving the fan liability also when it is working in aggressive environment.
  • another object of the present invention is to provide a shank for axial fan blades which is lighter with respect to the known type of steel shank, thus reducing the total weight of the shank-blade group and the bending stress on the shank itself.
  • a further object of the present invention is to provide a shank for axial fan blades which is suitable to efficiently discharge electrostatic charge, thus fulfilling the requirements of the ATEX norms concerning the safety of the fan when it is working in explosive environment.
  • a shank for axial ventilating fan blades said fan comprising an axial rotation shaft and an hub at the end of said shaft, the fan further comprising a plurality of blades each one of said blades being connected to said hub by means of a shank which is realized independently from said blade and which is steady connected to said blade by means of fixing elements, characterized in that said shank is made of composite material.
  • the blade shank for axial fans according to the present invention is characterized by the fact that said composite material comprises at least a resin in which fibers are impregnated by means of filament winding or pultrusion.
  • the present invention refers in particular to a blade shank for axial fans as described more fully in the claims, which are an integral part of this description.
  • the shank 1 according to the present invention has the shape of a tube, i.e. with an annular cross section, with a nominal thickness of about 10 mm.
  • the wall thickness depends upon the general dimension of the fan, therefore it can vary as a function of the diameter of the fan and of the surface of the blades.
  • Different shape of the shank could be considered, e.g. rectangular or polygonal cross section.
  • the shank 1 is fixed to the blade 2, just partially shown in figure 3 , by means of fixation means.
  • fixation means can comprise bolts 3 and specially designed threaded inserts 4 suitable to be inserted in the shank 1 in order to avoid deformations of the shank consequent to the tightening of the bolts.
  • both the elements 1, 2 are provided with one or more holes suitable to receive a bolt 3. Then, the threaded insert 4 is inserted into the shank in a position which corresponds to said holes and the bolt 3 is inserted and tightened.
  • the fixation of the shaft 1 to the blade 2 can be achieved with a plurality of bolts.
  • a couple of bolts diametrically opposed with respect to the diameter of the shank More in detail, it is preferable to provide at least a couple of bolts diametrically opposed with respect to the diameter of the shank. More preferably, a plurality of couples should be provided along the shank part which results inserted into the blade profile.
  • shank 1 At its opposite end the shank 1 is connected to the hub of the axial fan by means of connecting means.
  • the connecting means comprise pillow blocks 5a, 5b generally made of aluminium, are tightened by means of tightening means, e.g. the bolts 7a, 7b, surrounding the shank 1.
  • tightening means e.g. the bolts 7a, 7b
  • a metallic insert 6 is conveniently inserted into the shank 1.
  • the shank is made of composite material whose properties give to the shank a suitable flexibility and rigid links, and at the same time gives a high chemical resistance.
  • the composite shank can be constructed with two different technologies, filament winding, as shown in figure 1 , and pultrusion, as shown in figure 2 .
  • the best fiber orientation is around 20° with respect to the shank axis A.
  • the best lamination sequence is to apply two layers of +/-45°at the outer and inner surfaces of the tube and to manufacture the rest of the tube in uniaxial fibers, as shown in figure 5 .
  • the fibers are impregnated in resin which can comprise polyester or vinylester, the latter having a better chemical and mechanical resistance.
  • the composite shank has an higher flexibility with respect to the known solutions which comprise a steel shank or a fibreglass moulded shank-blade block.
  • conductive reinforcing fibers like carbon fibers, can be inserted in the resin while producing the composite shank.
  • the composite shank for axial fan blades has improved flexibility, thus realizing a flexible link between the blade and the fan hub.
  • the flexibility of the shank allows to reduce the vibrations consequent to the air load and to the rotational velocity of the fan and transmitted from the blades to the whole structure.
  • the composite shank according to the present invention has an improved resistance to chemical attack, thus improving the fan liability also when it is working in aggressive environment.
  • a further object achieved by the composite shank for axial fan blades according to the present invention is lighter with respect to the known type of shanks, thus reducing the total weight of the shank-blade block, the bending stress on the shank itself and the vibrations consequent to the fan rotation.
  • a further object achieved by the composite shank according to the present invention is to provide a shank for axial fan blades which is suitable to efficiently discharge electrostatic charge, thus fulfilling the requirements of the ATEX norms concerning the safety of the fan when it is working in explosive environment.
  • Another object achieved by the present invention is to provide a shank for axial fan blades which has an improved mechanical resistance in particular with respect to mechanical fatigue.
EP07122730A 2007-12-10 2007-12-10 Bras composite pour pales de ventilateur axial Withdrawn EP2071193A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP07122730A EP2071193A1 (fr) 2007-12-10 2007-12-10 Bras composite pour pales de ventilateur axial
PCT/EP2008/067098 WO2009074568A2 (fr) 2007-12-10 2008-12-09 Axe composite pour pales de ventilateur axial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07122730A EP2071193A1 (fr) 2007-12-10 2007-12-10 Bras composite pour pales de ventilateur axial

Publications (1)

Publication Number Publication Date
EP2071193A1 true EP2071193A1 (fr) 2009-06-17

Family

ID=39400982

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07122730A Withdrawn EP2071193A1 (fr) 2007-12-10 2007-12-10 Bras composite pour pales de ventilateur axial

Country Status (2)

Country Link
EP (1) EP2071193A1 (fr)
WO (1) WO2009074568A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016075575A1 (fr) * 2014-11-11 2016-05-19 Cofimco S.R.L. Unité de pale pour ventilateurs industriels
CN112969570A (zh) * 2018-10-30 2021-06-15 赛峰飞机发动机公司 叶片的纤维增强体的纤维的杂化

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918977A (en) * 1956-06-25 1959-12-29 Koppers Co Inc Blade assembly
GB1165738A (en) * 1966-11-01 1969-10-01 Cooling Dev Ltd Improvements in and relating to Fan-Type Impellers and to Blade Assemblies for use therewith
FR2427494A1 (fr) * 1978-06-01 1979-12-28 Neu Sa Perfectionnement aux pales pour ventilateurs helicoides de tres grand diametre
US4884948A (en) * 1987-03-28 1989-12-05 Mtu Motoren-Und Turbinen Union Munchen Gmbh Deflectable blade assembly for a prop-jet engine and associated method
EP1195527A1 (fr) * 2000-10-05 2002-04-10 Diandra S.A. Ventilateur axial
US6378322B1 (en) * 2001-02-28 2002-04-30 General Shelters Of Texas S.B., Ltd. High-performance molded fan

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2918977A (en) * 1956-06-25 1959-12-29 Koppers Co Inc Blade assembly
GB1165738A (en) * 1966-11-01 1969-10-01 Cooling Dev Ltd Improvements in and relating to Fan-Type Impellers and to Blade Assemblies for use therewith
FR2427494A1 (fr) * 1978-06-01 1979-12-28 Neu Sa Perfectionnement aux pales pour ventilateurs helicoides de tres grand diametre
US4884948A (en) * 1987-03-28 1989-12-05 Mtu Motoren-Und Turbinen Union Munchen Gmbh Deflectable blade assembly for a prop-jet engine and associated method
EP1195527A1 (fr) * 2000-10-05 2002-04-10 Diandra S.A. Ventilateur axial
US6378322B1 (en) * 2001-02-28 2002-04-30 General Shelters Of Texas S.B., Ltd. High-performance molded fan

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016075575A1 (fr) * 2014-11-11 2016-05-19 Cofimco S.R.L. Unité de pale pour ventilateurs industriels
CN107002707A (zh) * 2014-11-11 2017-08-01 可风可意大利公司 用于工业风扇的叶片单元
US20170314569A1 (en) * 2014-11-11 2017-11-02 Cofimco S.R.L. Blade unit for industrial fans
CN107002707B (zh) * 2014-11-11 2019-08-13 可风可意大利公司 用于工业风扇的叶片单元
US10533572B2 (en) * 2014-11-11 2020-01-14 Cofimco S.R.L. Blade unit for industrial fans
CN112969570A (zh) * 2018-10-30 2021-06-15 赛峰飞机发动机公司 叶片的纤维增强体的纤维的杂化
CN112969570B (zh) * 2018-10-30 2023-07-07 赛峰飞机发动机公司 叶片的纤维增强体的纤维的杂化

Also Published As

Publication number Publication date
WO2009074568A3 (fr) 2009-08-27
WO2009074568A2 (fr) 2009-06-18

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