EP0609671B1 - Fan rotor - Google Patents
Fan rotor Download PDFInfo
- Publication number
- EP0609671B1 EP0609671B1 EP94100402A EP94100402A EP0609671B1 EP 0609671 B1 EP0609671 B1 EP 0609671B1 EP 94100402 A EP94100402 A EP 94100402A EP 94100402 A EP94100402 A EP 94100402A EP 0609671 B1 EP0609671 B1 EP 0609671B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- ring
- fastening
- fan
- fastening part
- 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
Links
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims abstract description 4
- 230000001154 acute effect Effects 0.000 claims abstract description 4
- 239000011151 fibre-reinforced plastic Substances 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims abstract 7
- 239000000835 fiber Substances 0.000 claims description 35
- 230000002787 reinforcement Effects 0.000 claims description 9
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 3
- 230000002457 bidirectional effect Effects 0.000 claims description 2
- 239000012783 reinforcing fiber Substances 0.000 description 22
- 238000010276 construction Methods 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
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
- F04D29/38—Blades
-
- 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
Definitions
- the invention relates to a fan impeller, in particular for cooling tower fans, with fan blades made of fiber-reinforced plastic, which are provided with reinforcing fibers which run essentially parallel and / or at an acute angle to the longitudinal axis of the blade for transferring the total forces acting on the blades into the impeller hub, these reinforcing fibers on radially inner end of the wing bundled tubular and are attached to the impeller hub by a fastening ring engaging on the outer surface and on the inner surface of the fiber bundle, preferably rotatable about the longitudinal axis of the wing.
- Fan impellers of the type described above are known in various designs.
- the bundle of reinforcing fibers emerging at the radially inner end of the wing is widened by an increase in diameter.
- a conical inner ring is inserted, which, due to its wedge effect on the fiber bundle, clamps the fiber bundle together with a conical outer ring in order to transfer the total forces acting on the wing into the impeller hub.
- This known construction not only has the disadvantage of a large axial extension of the clamping elements, but also results in relatively high loads on the reinforcing fibers depending on the wedge angle, in particular if these are arranged in the region of the inner and outer surface of the tubular fiber bundle.
- the invention has for its object to develop a fan impeller of the type described in such a way that on the one hand the axial length for the clamping of the tubular fiber bundle is shortened and on the other hand the design effort both for fastening the reinforcing fibers to the fastening elements and for the arrangement of these fastening elements the impeller hub is reduced and thus the manufacturing costs are reduced.
- the solution to this problem by the invention is characterized in that the end of the tubular bundled reinforcement fibers is formed radially outwards and forwards to form a semicircular arc, which has a convex surface facing the impeller hub in a rounded annular groove of a disc-like one Fastening part rests and with its concave surface facing the wing blade is clamped to the fastening part by a fastening ring.
- the fastening part projects with a centering projection into the interior of the tubular fiber bundle. This results in a particularly simple and safe way of centering the fiber bundle and thus the fan blade on the impeller hub.
- the fastening part and / or the fastening ring are made of plastic. This makes it possible to embed the end ring formed from the reinforcing fiber ends into the fastening parts in the case of a not yet hardened plastic of the wing neck, so that a very durable and dimensionally accurate production is achieved.
- the disk-shaped fastening part of the fan blade can be fastened to a bearing flange of the impeller hub by means of ring segments placed on the fastening ring and through the fastening ring, the end ring of the fiber bundle and the fastening part. In this way, only a few and simple components are required for the fastening according to the invention.
- the wing blade in addition to the reinforcing fibers, can be provided with surface reinforcement embedded in its surface, preferably made of bidirectional and / or multidirectional fiber mats.
- the neck of the tubular fiber bundle can be provided with a sheath according to a further feature of the invention.
- this sheath is provided with fibers running transversely to the reinforcing fibers. These fibers, which surround the tubular reinforcement fibers in a ring, protect the reinforcement fibers against expansion of the fiber bundle and increase the strength of the neck-like end of the fan blade.
- the fan impeller shown in Fig. 1 has three fan blades P, each consisting of a blade 1, which is connected to the impeller hub 10 via a wing neck 2.
- the fan blades P are made of fiber-reinforced plastic, hollow or solid, with a suitable cross-sectional profile.
- Fig. 4 it is shown schematically that in the blade 1 reinforcing fibers F are arranged in the impeller hub 10 for transferring the total forces acting on the blade, which run essentially parallel and / or at an acute angle to the longitudinal axis 3 of the blade, which are shown in FIGS 4 is located.
- reinforcing fibers F are bundled tubular at the radially inner end of the wing blade 1, the cross section of this fiber bundle 5 shown in FIG. 3 being circular or oval and the axial course being cylindrical or conical.
- each of the tubular bundled reinforcement fibers F is first deformed radially outward and then forward to form an approximately semicircular arc, so that all reinforcement fibers F form an end ring 6, the cross section of which can be seen in FIG. 3 .
- This illustration further shows that the convex, the impeller hub 10 facing surface of this end ring 6 rests in a rounded ring groove 9 of a disk-like fastening part 8.
- a fastening ring 7 which, like the fastening part 8, is preferably made of plastic.
- Both the fastening ring 7 and the disk-shaped fastening part 8 are made of a suitable material, preferably of reinforced plastic. This makes it possible to embed the end ring 6 formed by the reinforcing fibers F into the annular groove 9 of the fastening part 8 and to connect it to the fastening ring 7 as long as the plastic of the wing neck 2 has not yet hardened.
- the surfaces of the annular groove in the fastening part 8 and the fastening ring 7 are rounded off with large radii in order to avoid damage to the fiber bundle 5 and to create a fiber-appropriate derivation of the forces acting on the wing blade 1 via the end ring 6 formed by the fiber bundle 5 into the impeller hub 10 .
- the possibly pre-stressed reinforcing fibers F of the fiber bundle 5 run parallel to the longitudinal axis 3 of the wing and are essentially subjected to tensile stress and very low bending and compressive loads, but are not exposed to shear stresses, so that the described fastening of the reinforcing fibers F also has a high fatigue strength taking into account the large number of load cycles to which each fan blade P is subjected.
- each blade 1 can be rotated about its longitudinal axis 3 of the blade, if necessary also with a rotating fan impeller .
- a protective cover L preferably made of fibers running transversely to the reinforcing fibers F of the fiber bundle 5.
- the reinforcing fibers F of the wing blade 1 are only loaded with forces that can easily be absorbed by the reinforcing fibers F, namely essentially tensile forces and low bending and pressing forces.
- the reinforcing fibers F are also not subjected to coulter, cutting and tearing forces in the area of the wing neck 2 and are only exposed to harmless compressive forces due to the compression of the fastening ring 7 and the fastening part 8.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Reinforced Plastic Materials (AREA)
Abstract
Description
Die Erfindung betrifft ein insbesondere für Kühlturm-ventilatoren bestimmtes Ventilatorlaufrad mit aus faserverstärktem Kunststoff hergestellten Ventilatorflügeln, die mit im wesentlichen parallel und/oder spitzwinklig zur Flügellängsachse verlaufenden Armierungsfasern zur Abtragung der insgesamt auf den Flügel einwirkenden Kräfte in die Laufradnabe versehen sind, wobei diese Armierungsfasern am radial innenliegenden Ende des Flügels rohrförmig gebündelt und durch einen an der Außenfläche und einen an der Innenfläche des Faserbündels angreifenden Befestigungsring, vorzugsweise um die Flügellängsachse verdrehbar an der Laufradnabe befestigt sind.The invention relates to a fan impeller, in particular for cooling tower fans, with fan blades made of fiber-reinforced plastic, which are provided with reinforcing fibers which run essentially parallel and / or at an acute angle to the longitudinal axis of the blade for transferring the total forces acting on the blades into the impeller hub, these reinforcing fibers on radially inner end of the wing bundled tubular and are attached to the impeller hub by a fastening ring engaging on the outer surface and on the inner surface of the fiber bundle, preferably rotatable about the longitudinal axis of the wing.
Ventilatorlaufräder der voranstehend beschriebenen Art sind in verschiedenen Ausführungen bekannt. Bei diesen bekannten Konstruktionen wird das am radial innenliegenden Ende des Flügels rohrförmig austretende Bündel aus Armierungsfasern durch eine Durchmessererweiterung aufgeweitet. In den hierdurch entstehenden Hohlraum wird ein konischer Innenring eingesetzt, der durch seine Keilwirkung auf das Faserbündel zusammen mit einem konischen Außenring das Faserbündel einspannt, um die insgesamt auf den Flügel einwirkenden Kräfte in die Laufradnabe abzutragen.Fan impellers of the type described above are known in various designs. In these known constructions, the bundle of reinforcing fibers emerging at the radially inner end of the wing is widened by an increase in diameter. In the resulting cavity, a conical inner ring is inserted, which, due to its wedge effect on the fiber bundle, clamps the fiber bundle together with a conical outer ring in order to transfer the total forces acting on the wing into the impeller hub.
Diese bekannte Konstruktion hat nicht nur den Nachteil einer großen axialen Erstreckung der Einspannelemente, sondern ergibt abhängig vom Keilwinkel auch relativ hohe Belastungen der Armierungsfasern, insbesondere wenn diese im Bereich der Innen-und Außenfläche des rohrförmigen Faserbündels angeordnet sind.This known construction not only has the disadvantage of a large axial extension of the clamping elements, but also results in relatively high loads on the reinforcing fibers depending on the wedge angle, in particular if these are arranged in the region of the inner and outer surface of the tubular fiber bundle.
Der Erfindung liegt die Aufgabe zugrunde, ein Ventilatorlaufrad der eingangs beschriebenen Art derart weiterzubilden, daß einerseits die axiale Baulänge für die Einspannung des rohrförmigen Faserbündels verkürzt und andererseits der konstruktive Aufwand sowohl für die Befestigung der Armierungsfasern an den Befestigungselementen als auch für die Anordnung dieser Befestigungselemente an der Laufradnabe verringert und damit die Herstellkosten herabgesetzt werden.The invention has for its object to develop a fan impeller of the type described in such a way that on the one hand the axial length for the clamping of the tubular fiber bundle is shortened and on the other hand the design effort both for fastening the reinforcing fibers to the fastening elements and for the arrangement of these fastening elements the impeller hub is reduced and thus the manufacturing costs are reduced.
Die Lösung dieser Aufgabenstellung durch die Erfindung ist dadurch gekennzeichnet, daß das Ende der rohrförmig gebündelten Armierungsfasern unter Bildung eines halbkreisförmigen Bogens radial nach außen und nach vorn zu einem Abschlußring geformt ist, der mit seiner konvexen, der Laufradnabe zugewandten Oberfläche in einer ausgerundeten Ringnut eines scheibenartigen Befestigungsteiles anliegt und mit seiner konkaven, dem Flügelblatt zugewandten Oberfläche durch einen Befestigungsring mit dem Befestigungsteil verspannt ist.The solution to this problem by the invention is characterized in that the end of the tubular bundled reinforcement fibers is formed radially outwards and forwards to form a semicircular arc, which has a convex surface facing the impeller hub in a rounded annular groove of a disc-like one Fastening part rests and with its concave surface facing the wing blade is clamped to the fastening part by a fastening ring.
Durch die erfindungsgemäße Ausbildung eines Abschlußringes mit etwa halbkreisförmigem Querschnitt ergibt sich nicht nur eine axial sehr kurze Einspannlänge der Armierungsfasern, sondern zugleich eine einfache und sichere Einspannung, die zudem die Abtragung hoher Kräfte ermöglicht, ohne die halbkreisförmig gebogenen Armierungsfasern mit unzulässig hohen Spannkräften zu belasten. Gegenüber der bisherigen keilförmigen Einspannung sinken die Faserbelastungen, so daß die erfindungsgemäße Weiterbildung eine fasergerechte Einspannung und Kraftableitung ergibt.The inventive design of an end ring with an approximately semicircular cross-section not only results in an axially very short clamping length of the reinforcing fibers, but at the same time simple and secure clamping, which also allows the removal of high forces without loading the semicircularly curved reinforcing fibers with impermissibly high clamping forces. Compared to the previous wedge-shaped clamping, the fiber loads decrease, so that the further development according to the invention results in clamping and force dissipation that is appropriate for the fibers.
Gemäß einem weiteren Merkmal der Erfindung ragt das Befestigungsteil mit einem Zentrieransatz in das Innere des rohrförmigen Faserbündels hinein. Hierdurch wird auf besonders einfache und sichere Weise eine Zentrierung des Faserbündels und damit des Ventilatorflügels an der Laufradnabe erzielt.According to a further feature of the invention, the fastening part projects with a centering projection into the interior of the tubular fiber bundle. This results in a particularly simple and safe way of centering the fiber bundle and thus the fan blade on the impeller hub.
Bei einer bevorzugten Ausführungsform der Erfindung werden das Befestigungsteil und/oder der Befestigungsring aus Kunststoff hergestellt. Hierdurch ist ein Einbetten des aus den Armierungsfaserenden gebildeten Abschlußringes in die Befestigungsteile bei noch nicht ausgehärtetem Kunststoff des Flügelhalses möglich, so daß eine sehr haltbare und maßgenaue Fertigung erzielt wird.In a preferred embodiment of the invention, the fastening part and / or the fastening ring are made of plastic. This makes it possible to embed the end ring formed from the reinforcing fiber ends into the fastening parts in the case of a not yet hardened plastic of the wing neck, so that a very durable and dimensionally accurate production is achieved.
Gemäß einem weiteren Merkmal der Erfindung kann das scheibenförmige Befestigungsteil des Ventilatorflügels durch auf den Befestigungsring aufgesetzte Ringsegmente und durch den Befestigungsring, den Abschlußring des Faserbündels und das Befestigungsteil durchdringende Schrauben an einem Lagerflansch der Laufradnabe befestigt werden. Für die erfindungsgemäße Befestigung werden auf diese Weise nur wenige und einfache Bauteile benötigt.According to a further feature of the invention, the disk-shaped fastening part of the fan blade can be fastened to a bearing flange of the impeller hub by means of ring segments placed on the fastening ring and through the fastening ring, the end ring of the fiber bundle and the fastening part. In this way, only a few and simple components are required for the fastening according to the invention.
Das Flügelblatt kann erfindungsgemäß zusätzlich zu den Armierungsfasern mit einer in seine Oberfläche eingebetteten Flächenarmierung, vorzugsweise aus bidirektionalen und/oder multidirektionalen Fasermatten versehen sein.According to the invention, in addition to the reinforcing fibers, the wing blade can be provided with surface reinforcement embedded in its surface, preferably made of bidirectional and / or multidirectional fiber mats.
Um das radial innenliegende Ende jedes Ventilatorflügels gegen Beschädigungen zu schützen, kann gemäß einem weiteren Merkmal der Erfindung der Hals des rohrförmigen Faserbündels mit einer Hülle versehen werden. Bei einer bevorzugten Ausführungsform der Erfindung ist diese Hülle mit quer zu den Armierungsfasern verlaufenden Fasern versehen. Diese die rohrförmig angeordneten Armierungsfasern ringförmig umschließenden Fasern schützen die Armierungsfasern vor einer Aufweitung des Faserbündels und erhöhen die Festigkeit des halsartigen Endes des Ventilatorflügels.In order to protect the radially inner end of each fan blade against damage, the neck of the tubular fiber bundle can be provided with a sheath according to a further feature of the invention. In a preferred embodiment of the invention, this sheath is provided with fibers running transversely to the reinforcing fibers. These fibers, which surround the tubular reinforcement fibers in a ring, protect the reinforcement fibers against expansion of the fiber bundle and increase the strength of the neck-like end of the fan blade.
Auf der Zeichnung ist ein Ausführungsbeispiel eines erfindungsgemäßen Ventilatorlaufrades dargestellt, und zwar zeigen:
- Fig. 1
- die Ansicht eines dreiflügeligen Ventilatorlaufrades,
- Fig. 2
- eine Seitenansicht eines Ventilatorflügels in Blickrichtung des Pfeiles A in Fig. 1 gesehen,
- Fig. 3
- einen Längsschnitt durch das durch den Kreis B in Fig. 2 gekennzeichnete Ende des Ventilatorflügels und
- Fig. 4
- eine Seitenansicht eines Ventilatorflügels mit schematisch eingezeichneten Armierungsfasern.
- Fig. 1
- the view of a three-bladed fan impeller,
- Fig. 2
- a side view of a fan blade seen in the direction of arrow A in Fig. 1,
- Fig. 3
- a longitudinal section through the end marked by the circle B in Fig. 2 of the fan blade and
- Fig. 4
- a side view of a fan blade with schematically drawn reinforcing fibers.
Das in Fig. 1 dargestellte Ventilatorlaufrad hat drei Ventilatorflügel P, die jeweils aus einem Flügelblatt 1 bestehen, das über einen Flügelhals 2 mit der Laufradnabe 10 verbunden ist. Die Ventilatorflügel P sind aus faserverstärktem Kunststoff hohl oder massiv mit einem geeigneten Querschnittsprofil hergestellt. In Fig. 4 ist schematisch eingezeichnet, daß im Flügelblatt 1 Armierungsfasern F zur Abtragung der insgesamt auf den Flügel einwirkenden Kräfte in die Laufradnabe 10 angeordnet sind, die im wesentlichen parallel und/oder spitzwinklig zur Flügellängsachse 3 verlaufen, die in den Fig. 3 und 4 eingezeichnet ist.The fan impeller shown in Fig. 1 has three fan blades P, each consisting of a
Diese Armierungsfasern F sind am radial innenliegenden Ende des Flügelblattes 1 rohrförmig gebündelt, wobei der Querschnitt dieses in Fig. 3 eingezeichneten Faserbündels 5 kreisförmig oder oval und der axiale Verlauf zylindrisch oder konisch sein kann.These reinforcing fibers F are bundled tubular at the radially inner end of the
Wie die Fig. 3 zeigt, ist das Ende jeder der rohrförmig gebündelten Armierungsfasern F zuerst radial nach außen und anschließend nach vorn zu einem etwa halbkreisförmigen Bogen verformt, so daß alle Armierungsfasern F einen Abschlußring 6 bilden, dessen Querschnitt in Fig. 3 zu erkennen ist. Diese Darstellung zeigt weiterhin, daß die konvexe, der Laufradnabe 10 zugewandte Oberfläche dieses Abschlußringes 6 in einer ausgerundeten Ringnut 9 eines scheibenartigen Befestigungsteiles 8 anliegt. An der konkaven, dem Flügelblatt 1 zugewandten Oberfläche des Abschlußringes 6 liegt ein Befestigungsring 7 an, der ebenso wie das Befestigungsteil 8 vorzugsweise aus Kunststoff hergestellt ist.As shown in FIG. 3, the end of each of the tubular bundled reinforcement fibers F is first deformed radially outward and then forward to form an approximately semicircular arc, so that all reinforcement fibers F form an
Die gemäß Fig. 4 eine fächerartige Armierung des Flügelblattes 1 bildenden Armierungsfasern F werden an ihrem durch den Abschlußring 6 gebildeten Ende zwischen dem Befestigungsring 7 und dem Befestigungsteil 8 eingespannt und mit Hilfe dieser Teile an einem scheibenförmigen Flansch 10a der Laufradnabe 10 befestigt. Beim Ausführungsbeispiel geschieht diese Befestigung durch Schrauben 11, die sowohl den Flansch 10a der Laufradnabe 10 als auch das Befestigungsteil 8, den Abschlußring 6 und den Befestigungsring 7 durchdringen. Um die Schraubenkräfte auf eine größere Oberfläche zu verteilen, sind auf den Befestigungsring 7 Ringsegmente 12 aufgesetzt, die im Querschnitt in Fig. 3 zu erkennen sind.4 forming a fan-like reinforcement of the
Sowohl der Befestigungsring 7 als auch das scheibenförmige Befestigungsteil 8 sind aus einem geeigneten Werkstoff, vorzugsweise aus armiertem Kunststoff hergestellt. Hierdurch ist es möglich, den durch die Armierungsfasern F gebildeten Abschlußring 6 in die Ringnut 9 des Befestigungsteiles 8 einzubetten und mit dem Befestigungsring 7 zu verbinden, solange der Kunststoff des Flügelhalses 2 noch nicht ausgehärtet ist. Die Oberflächen der Ringnut im Befestigungsteil 8 und des Befestigungsringes 7 sind mit großen Radien ausgerundet, um Schädigungen des Faserbündels 5 zu vermeiden und eine fasergerechte Ableitung der auf das Flügelblatt 1 einwirkenden Kräfte über den durch das Faserbündel 5 gebildeten Abschlußring 6 in die Laufradnabe 10 zu schaffen. Die ggf. vorgespannten Armierungsfasern F des Faserbündels 5 verlaufen parallel zur Flügellängsachse 3 und sind im wesentlichen einer Zugbelastung und sehr geringen Biege- und Druckbelastungen unterworfen, jedoch keinen Scherbelastungen ausgesetzt, so daß die beschriebene Befestigung der Armierungsfasern F auch unter Berücksichtigung der großen Lastspielzahlen, denen jeder Ventilatorflügel P unterworfen ist, eine hohe Dauerfestigkeit hat.Both the
Wie insbesondere die Fig. 3 erkennen läßt, benötigt die beschriebene Befestigung lediglich eine kurze axiale Baulänge. Durch einen in das Innere des rohrförmigen Faserbündels 5 hineinragenden Zentrieransatz des Befestigungsteils 8 ergibt sich eine einfache und wirkungsvolle Zentrierung des Flügelblattes 1 relativ zur Laufradnabe 10. Durch geeignete Maßnahmen kann jedes Flügelblatt 1 - ggf. auch bei umlaufendem Ventilatorlaufrad - um seine Flügellängsachse 3 verdreht werden. Zum Schutz des Faserbündels 5 kann dieses mit einer Schutzhülle L, vorzugsweise aus quer zu den Armierungsfasern F des Faserbündels 5 verlaufenden Fasern versehen werden. Diese das rohrförmige Faserbündel 5 ringförmig umschlingenden Fasern stellen eine zusätzliche Verstärkung des Flügelhalses 2 dar, welche die hohe Ermüdungsfestigkeit der beschriebenen Befestigung noch erhöht.As can be seen in particular in FIG. 3, the attachment described requires only a short axial length. A centering projection of the fastening
Insgesamt ergibt sich eine Konstruktion, bei der die Armierungsfasern F des Flügelblattes 1 ausschließlich mit Kräften belastet werden, die durch die Armierungsfasern F problemlos aufgenommen werden können, nämlich im wesentlichen Zugkräfte und geringe Biege- und Preßkräfte. Die Armierungsfasern F sind auch im Bereich des Flügelhalses 2 keinen Schar-, Schneide- und Reißkräften unterworfen und durch das Zusammenpressen des Befestigungsringes 7 und des Befestigungsteiles 8 nur unschädlichen Druckkräften ausgesetzt.Overall, there is a construction in which the reinforcing fibers F of the
- 11
- FlügelblattWing blade
- 22nd
- FlügelhalsWing neck
- 33rd
- FlügellängsachseLongitudinal wing axis
- 55
- FaserbündelFiber bundle
- 66
- AbschlußringEnd ring
- 77
- BefestigungsringMounting ring
- 88th
- BefestigungsteilFastener
- 99
- RingnutRing groove
- 1010th
- LaufradnabeImpeller hub
- 10a10a
- Flanschflange
- 1111
- Schraubescrew
- 1212th
- RingsegmentRing segment
- FF
- ArmierungsfaserReinforcing fiber
- LL
- SchutzhülleProtective cover
- PP
- VentilatorflügelFan blades
Claims (7)
- Fan rotor, especially for cooling-tower fans, with fan blades (P) which are made from fibre-reinforced plastic and which are provided with reinforcing fibres (F), running essentially parallel to and/or at an acute angle to the blade longitudinal axis (3), for transferring the forces acting as a whole on the fan blade (P) into the rotor hub (10), these reinforcing fibres (F) being bundled in tubular form at the radially inner end of the blade leaf (1) and being fastened to the rotor hub (10) preferably rotatably about the blade longitudinal axis, by means of a fastening ring engaging on the outer face and a fastening ring engaging on the inner face of the fibre bundle (5), characterized in that the end of the reinforcing fibres (F) bundled in tubular form is shaped radially outwards and forwards in a semicircular arc, to form an end ring (6) which bears with its convex surface confronting the rotor hub (10) in a rounded-out annular groove (9) of a disc-like fastening part (8) and which is braced with its concave surface confronting the blade leaf (1) together with the fastening part (8) by means of a fastening ring (7).
- Fan rotor according to Claim 1, characterized in that the fastening part (8) projects with a centring extension into the interior of the tubular fibre bundle (5).
- Fan rotor according to Claim 1 or 2, characterized in that the fastening part (8) and/or the fastening ring (7) are made from plastic.
- Fan rotor according to at least one of Claims 1 to 3, characterized in that the disc-shaped fastening part (8) of the fan blade (P) is fastened to a flange (10a) of the rotor hub (10) by means of screws (11) which press through ring segments (12) placed onto the fastening ring (7) and through the fastening ring (7), the end ring (6) and the fastening part (8).
- Fan rotor according to at least one of Claims 1 to 4, characterized in that the blade leaf (1) is provided, in addition to the reinforcing fibres (F), with a surface reinforcement embedded in its surface and preferably composed of bidirectional and/or multidirectional fibre mats.
- Fan rotor according to at least one of Claims 1 to 5, characterized in that the blade neck (2) of the tubular fibre bundle (5) is provided with a sheath (L).
- Fan rotor according to Claim 6, characterized in that the protective sheath (L) is provided with fibres running transversely relative to the reinforcing fibres (F).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BR9300312 | 1993-02-02 | ||
| BR9300312A BR9300312A (en) | 1993-02-02 | 1993-02-02 | IMPROVEMENT IN FIBER REINFORCED PLASTIC PAS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0609671A1 EP0609671A1 (en) | 1994-08-10 |
| EP0609671B1 true EP0609671B1 (en) | 1996-02-21 |
Family
ID=4055728
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94100402A Expired - Lifetime EP0609671B1 (en) | 1993-02-02 | 1994-01-13 | Fan rotor |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US5458465A (en) |
| EP (1) | EP0609671B1 (en) |
| AT (1) | ATE134423T1 (en) |
| BR (1) | BR9300312A (en) |
| DE (1) | DE59400122D1 (en) |
| ES (1) | ES2085803T3 (en) |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5494404A (en) * | 1993-12-22 | 1996-02-27 | Alliedsignal Inc. | Insertable stator vane assembly |
| SE506358C2 (en) * | 1996-04-17 | 1997-12-08 | Flaekt Ab | Rotor blade for attaching to a hub of a rotor, such as a vane for attaching to a fan hub |
| US5921754A (en) * | 1996-08-26 | 1999-07-13 | Foster-Miller, Inc. | Composite turbine rotor |
| SE514094C2 (en) * | 1999-05-19 | 2001-01-08 | Kamewa Ab | Ship propeller with detachable fixed blade |
| US6390777B1 (en) | 1999-09-01 | 2002-05-21 | Angelo Fan Brace Licensing, L.L.C. | Quick-connect fan blade mounting assembly |
| US6565436B1 (en) * | 2000-10-05 | 2003-05-20 | Igt | Gaming device having a weighted probability for selecting a bonus game |
| US7993103B2 (en) * | 2006-01-05 | 2011-08-09 | General Electric Company | Wind turbine blades and methods of attaching such blades to a hub |
| DE102006022272C5 (en) | 2006-05-11 | 2013-07-25 | Repower Systems Ag | Rotor blade connection |
| ES2394077T3 (en) * | 2007-03-06 | 2013-01-16 | Tecsis Tecnologia E Sistemas Avancados S.A. | Fan blade connection |
| US8091177B2 (en) | 2010-05-13 | 2012-01-10 | Robert Bosch Gmbh | Axial-flow fan |
| EP2554834B1 (en) * | 2011-08-02 | 2016-07-13 | Alstom Wind, S.L.U. | Rotor for a wind turbine |
| EP2888473B1 (en) * | 2012-06-22 | 2018-11-28 | LM Wind Power International Technology II ApS | A system and method to provide for accurate alignment when mounting a wind turbine blade |
| US9797257B2 (en) | 2012-12-10 | 2017-10-24 | General Electric Company | Attachment of composite article |
| US9777579B2 (en) | 2012-12-10 | 2017-10-03 | General Electric Company | Attachment of composite article |
| JP6210459B2 (en) * | 2014-11-25 | 2017-10-11 | 三菱重工業株式会社 | Impeller and rotating machine |
| JP6475767B2 (en) * | 2017-02-09 | 2019-02-27 | 三菱重工業株式会社 | Wind turbine blade and method for reinforcing wind turbine blade |
| FR3120249B1 (en) * | 2021-03-01 | 2023-12-29 | Safran Aircraft Engines | Blade comprising a composite material structure and associated manufacturing method |
| FR3123885B1 (en) * | 2021-06-15 | 2023-06-16 | Safran Aircraft Engines | NON-FULL TURBOMACHINE RECTIFIER EQUIPPED WITH STATOR BLADES FIXED TO PIVOTS AND CORRESPONDING TURBOMACHINE |
| FR3124825B1 (en) | 2021-06-30 | 2023-05-26 | Safran Aircraft Engines | PROPELLER FOR AN AIRCRAFT TURBOMACHINE WITH A VARIABLE-PITCHED BLADE AND A GEARED COUNTERWEIGHT DEVICE |
| FR3132123B1 (en) * | 2022-01-21 | 2023-12-08 | Safran Aircraft Engines | Turbomachine secondary flow rectifier blade, turbomachine provided therewith |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB163536A (en) * | 1920-03-16 | 1921-05-26 | Henry Charles Watts | Improvements relating to air screws |
| GB165548A (en) * | 1920-04-01 | 1921-07-01 | Henry Leitner | Improvements in screw-propellers |
| GB493145A (en) * | 1937-03-31 | 1938-09-30 | Bruno Jablonsky | Pressed articles, particularly airscrew blades, of laminated wood and method of manufacturing the same |
| FR835724A (en) * | 1937-03-31 | 1938-12-29 | Improvements to aerial propellers and propeller blades or wings, and manufacturing process | |
| US2182812A (en) * | 1938-02-10 | 1939-12-12 | Lougheed Victor | Air propeller blade |
| DE2113189A1 (en) * | 1971-03-18 | 1972-09-28 | Karberg & Hennemann Kg | Fan wheel blade for axial fans and process for their production |
| US4407635A (en) * | 1979-01-08 | 1983-10-04 | Trw Inc. | Aircraft propeller assembly with composite blades |
| US4260332A (en) * | 1979-03-22 | 1981-04-07 | Structural Composite Industries, Inc. | Composite spar structure having integral fitting for rotational hub mounting |
| DE3710321C1 (en) * | 1987-03-28 | 1988-06-01 | Mtu Muenchen Gmbh | Fan blade, especially for prop fan engines |
| US4915590A (en) * | 1987-08-24 | 1990-04-10 | Fayette Manufacturing Corporation | Wind turbine blade attachment methods |
| DE3826378A1 (en) * | 1988-08-03 | 1990-02-08 | Mtu Muenchen Gmbh | FIBER TECHNICAL PROPELLER BLADES |
| DE3844191A1 (en) * | 1988-12-29 | 1990-07-05 | Mtu Muenchen Gmbh | SHOVEL FOOT FASTENING FOR A FIBER TECHNICAL ROTOR SHOVEL |
| US5096384A (en) * | 1990-07-27 | 1992-03-17 | The Marley Cooling Tower Company | Plastic fan blade for industrial cooling towers and method of making same |
-
1993
- 1993-02-02 BR BR9300312A patent/BR9300312A/en not_active IP Right Cessation
-
1994
- 1994-01-13 ES ES94100402T patent/ES2085803T3/en not_active Expired - Lifetime
- 1994-01-13 EP EP94100402A patent/EP0609671B1/en not_active Expired - Lifetime
- 1994-01-13 AT AT94100402T patent/ATE134423T1/en not_active IP Right Cessation
- 1994-01-13 DE DE59400122T patent/DE59400122D1/en not_active Expired - Fee Related
- 1994-02-02 US US08/191,433 patent/US5458465A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR9300312A (en) | 1993-07-27 |
| ATE134423T1 (en) | 1996-03-15 |
| EP0609671A1 (en) | 1994-08-10 |
| ES2085803T3 (en) | 1996-06-01 |
| US5458465A (en) | 1995-10-17 |
| DE59400122D1 (en) | 1996-03-28 |
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