EP3030792A1 - Impeller for axial fans - Google Patents

Impeller for axial fans

Info

Publication number
EP3030792A1
EP3030792A1 EP15730394.2A EP15730394A EP3030792A1 EP 3030792 A1 EP3030792 A1 EP 3030792A1 EP 15730394 A EP15730394 A EP 15730394A EP 3030792 A1 EP3030792 A1 EP 3030792A1
Authority
EP
European Patent Office
Prior art keywords
impeller
blade root
fastening segments
blade
sleeves
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.)
Granted
Application number
EP15730394.2A
Other languages
German (de)
French (fr)
Other versions
EP3030792B1 (en
Inventor
Frank Kinzer
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.)
TLT Turbo GmbH
Original Assignee
TLT Turbo GmbH
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 TLT Turbo GmbH filed Critical TLT Turbo GmbH
Publication of EP3030792A1 publication Critical patent/EP3030792A1/en
Application granted granted Critical
Publication of EP3030792B1 publication Critical patent/EP3030792B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F04D29/34—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
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • 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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646—Mounting or removal of fans
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/60—Assembly methods
    • 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
    • F05D2240/00—Components
    • F05D2240/20—Rotors

Definitions

  • the invention relates to an impeller for an axial fan with an impeller body having an outer impeller shell and a support disc having a hub for rotationally fixed connection to a drive shaft, wherein on the support disc a plurality of radially outwardly directed blades are arranged, each having a Have blade root and an airfoil.
  • An impeller for an axial fan often consists of an impeller body, a plurality of radially outwardly directed blades and elements for attachment of the blades on the impeller body.
  • Anströmhaube is provided to reduce vortex.
  • the impeller body includes, inter alia, an outer impeller shell for flow guidance, a support disk and a hub for the rotationally fixed coupling of a drive shaft.
  • the impeller body may be integrally formed and in this case z. B. be made by welding, casting or forging.
  • the impeller body and multi-part, z. B. be constructed with screwed individual components.
  • the blades as primarily aerodynamically active components generally comprise an airfoil and a blade root for attachment to the Schaufelrad emotions. Also for the blades come a variety of manufacturing processes, such. For example, forging, casting, pressing or milling into consideration.
  • the impeller of the axial fan comprises a cylindrical support disc and a plurality of blades, each having a blade root and an airfoil.
  • a jaw pair is provided in each case.
  • the jaws of each jaw pair are arranged for this purpose on both sides of the support plate and screwed to it. All jaws are identical in terms of their shape insofar as they are arbitrarily interchangeable.
  • Each jaw merges in its radially outwardly directed area into a radially outwardly facing skirt.
  • the partially overlapping aprons together on each side of the impeller form a circumferential hub ring for optimizing the flow guidance.
  • this known impeller When assembling this known impeller can also rotate the blades before clamping in a defined by the jaws picking test by tightening through bolts and nuts about their own longitudinal axis, so that the angle of attack of each blade can be set freely. Furthermore, two spacers and a clamping sleeve are added to each through-bolt.
  • a disadvantage of this embodiment is that the jaws are designed as pressed parts, castings or forgings with a comparatively complex three-dimensional geometry.
  • the object of the invention is therefore to provide an impeller for an axial fan, which can be manufactured inexpensively using primarily simple-shaped standard components.
  • an impeller for an axial fan with an impeller body having an outer impeller shell and a support disc having a hub for rotationally fixed connection to a drive shaft, wherein on the support disc a plurality of radially outwardly directed blades are arranged, each having a blade root and have an airfoil.
  • each blade root has a fastening portion which is positively received between two trapezoidal, triangular, or rectangular fastening segments arranged opposite each other on both sides of the support disk and the respective two opposite fastening segments and the support disk each have at least two through holes for receiving a short sleeve and a long sleeve and the attachment portion is firmly clamped by means of each inserted through the sleeves bolts and nuts between two opposite fastening segments, each blade root is guided in each case a recess of the support disk.
  • the impeller can be made using comparatively simple and therefore in the production of cost-effective items.
  • the invention also allows the reduction of the variety of parts by the extensive use of identical parts, even with different impeller sizes.
  • the sleeves are used inter alia to initiate the high radial forces in the support plate, which is not mandatory as a disc, but z. B. may also be designed as a spoke construction or the like.
  • the recesses each have a rectangular shape. Accordingly, the support disc between each two adjacent blade roots on a radially outwardly directed, trapezoidal material region or a gear-like peripheral contour.
  • the sleeves each have a collar on one side. It is preferably a short and a longer trained sleeve, each having a collar on one end face. The short and long sleeves are positively inserted in the fasteners and the support disk, the collar of the short and the long sleeve in its centering, however, not.
  • each blade root is guided in a bore of the impeller shell.
  • a shaft length of each first sleeve is substantially larger than a shaft length of each second sleeve.
  • each attachment portion of a blade root is a cylinder with at least one circumferentially circumferential annular groove.
  • the blades can be initially rotated arbitrarily about their longitudinal axis during assembly before the final tightening, so that the angle of attack of the blades and thus the media flow rate of the axial fan can be influenced.
  • such a cylinder geometry can be easily manufactured.
  • Figure 1 is a plan view of a section of an impeller according to the invention for an axial fan
  • Figure 2 is a cross-section along the section line of II-II of Figure 1;
  • FIG. 3 shows a cross section along the section line of III-III of Fig. 1st
  • FIG. 1 shows a plan view of a section of an impeller according to the invention for an axial fan.
  • the impeller 10 for an axial fan or axial fan has inter alia an impeller body 12 with an outer impeller shell 14 and a support plate 16.
  • a hub 18 is arranged for rotationally fixed connection with a drive shaft 20 centrally.
  • Attached to the support disk 16 are a plurality of blades, one blade of which is representatively designated by the reference numeral 22.
  • the blade 22 has a blade root 24 and an airfoil 26.
  • the blade root 24 of the blade 22 is, like all others, firmly clamped between two oppositely mounted on the support plate 16 trapezoidal, rectangular or triangular fastening segments, of which only one front trapezoidal, rectangular or triangular fastening segment 28 is visible.
  • each two oppositely positioned on the support plate 16 fastening segments and their connection to the support plate 16 by means of at least two bolts 30 to 36 and here equally concealed nuts.
  • the blade 22 Prior to clamping the fastening segments, the blade 22, like the others, can be pivoted freely around its axis of rotation 38 so that optimal angles of attack of the blades 22 of the rotor 10 can be set for different application scenarios.
  • FIG. 2 illustrates a cross-section along the section line of II-II of FIG. 1.
  • the fastening segment 28 is braced by means of the threaded bolts 32, 36 and the nuts 40, 42 screwed onto these with a further fastening segment 44 disposed opposite to the support disk 16, and with the support disk 16 connected.
  • Above the two fastening segments 28, 44 extends between the fastening segments 28, 44 clamped blade root 24 of the blade 22nd
  • Each bolt 32, 36 is in each case in a long sleeve 46 and a short sleeve 48 and another long sleeve 50 and another short sleeve 52 added, whose better illustrative overview half unsigned shafts are separated by an annular gap 54, 56 from each other ,
  • the sleeves 46 to 52 each have a hollow cylindrical shape and the annular gaps 54, 56 may also be approximately zero in width.
  • the likewise not designated shaft length of the long sleeves 46, 50 is substantially larger than a shaft length of the short sleeves 48, 52.
  • the sleeves 46 to 52 are each in a cylindrical through hole 58, 60, which are the two fastening segments 28, 44 and the support plate sixteenth completely penetrated, added.
  • a radial clearance between the sleeves 46 to 52 and the through holes 58, 60 is preferably of the order of zero.
  • a slight interference fit may be provided.
  • the through holes 58, 60 may each have cylindrical counterbores 62 to 68 in which the sleeves 46 to 52 are received.
  • a respective collar 70, 72, 74 or 76 of the sleeves 46 to 52 is not positively received, but only the shafts of the sleeves 46 to 52.
  • the countersinks 62 to 68 are in each case in non-designated and away from the support plate 16 tops of the two Attachment segments 28, 44 introduced. Between the inner sides 78, 80 of the two fastening segments 28, 44 and the support disk 16 is here in each case an axial gap 82, 84, each clearly smaller than the annular gaps 54, 56 between the long and the short sleeve 46, 48 and the other long and another short sleeve 50, 52.
  • the sleeves 46 to 52 serve primarily to accommodate the axial centrifugal forces acting on the blades high centrifugal forces, while the collars 70, 72, 74, 76 have a similar function for the heads of bolts and the nuts as conventional, separate pads.
  • the hidden here screw bolts and all other bolts are used in sleeves of the same structural design. It is important that the fastening segments 28, 44 do not necessarily rest on the support plate 16 - d. H. both axial gaps 82, 84 in this constellation are greater than zero - but nevertheless can.
  • FIG. 3 shows a cross section along the section line of III-III of FIG. 1.
  • the underside of the blade 26 of the blade 22 preferably integrally formed blade root 24 has a contoured mounting portion 90.
  • the contoured mounting portion 90 is formed as a cylinder 92 with a recessed, circumferentially encircling annular groove 94.
  • Each fastening segment 28, 44 has a recess 96, 98 symbolized by a dotted line, in which the fastening section 90 is received in a form-fitting manner with an exact fit.
  • a bore 100 for the implementation of the fastening portion 90 of the blade root 24 is introduced.
  • an approximately rectangular recess 102 is inserted below the blade root 24, which is necessary for receiving the blade root 24. Accordingly, a circumferential contour of the support plate 16 is formed like a toothed wheel, such that in each case a radially outwardly directed trapezoidal material region remains between each two adjacent recesses.
  • Both the bore 100 and the recess 102 serve to optimize the guidance of the blade 22 on the support disk 16.

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

Abstract

The invention relates to an impeller (10) for an axial fan, comprising an impeller body (12), which has an outer impeller jacket (14) and a carrying disk (16) having a hub (18) for connecting to a drive shaft (20) in a rotationally fixed manner, wherein a plurality of blades (22) directed radially outward is arranged on the carrying disk (16), which blades each have a blade root (24) and a blade airfoil (26). According to the invention, each blade root (24) has a fastening section (90), which is accommodated in a positive-locking manner between two fastening segments (28, 44) arranged oppositely on either side of the carrying disk (16), the two opposite fastening segments (28, 44) and the carrying disk (16) each have at least two through bores (58, 60) for accommodating a long sleeve (46, 50) and a short sleeve (48, 52), and the fastening section (90) can be firmly clamped between two opposite fastening segments (28, 44) by means of threaded bolts (30, 32, 34, 36) inserted through the sleeves (46, 48, 50, 52) and by means of nuts (40, 42), wherein each blade root (24) is guided in a cut-out (102) in the carrying disk (16). As a result of the design according to the invention, the impeller (10) can be produced economically, predominantly using individual parts having a comparatively simple geometric form.

Description

Laufrad für Axiallüfter  Impeller for axial fan
Stand der Technik State of the art
Die Erfindung bezieht sich auf ein Laufrad für einen Axiallüfter mit einem Laufradkörper, der einen äußeren Laufradmantel sowie eine Tragscheibe mit einer Nabe zur drehfesten Verbindung mit einer Antriebswelle aufweist, wobei an der Tragscheibe eine Vielzahl von radial nach außen gerichteten Schaufeln angeordnet sind, die jeweils einen Schaufelfuß und ein Schaufelblatt aufweisen. The invention relates to an impeller for an axial fan with an impeller body having an outer impeller shell and a support disc having a hub for rotationally fixed connection to a drive shaft, wherein on the support disc a plurality of radially outwardly directed blades are arranged, each having a Have blade root and an airfoil.
In der Technik finden Axialventilatoren verbreitet Anwendung. Ein Laufrad für einen Axialventilator besteht vielfach aus einem Laufradkörper, mehreren radial auswärts gerichteten Schaufeln und Elementen zur Befestigung der Schaufeln am Laufradkörper. Darüber hinaus ist oftmals eine am Laufradkörper befestigte Anströmhaube zur Verringerung von Wirbeln vorgesehen. Der Laufradkörper umfasst unter anderem einen äußeren Laufradmantel zur Strömungsführung, eine Tragscheibe sowie eine Nabe zur drehfesten Ankopplung einer Antriebswelle. Der Laufradkörper kann einstückig ausgebildet sein und in diesem Fall z. B. durch Schweißen, Gießen oder Schmieden hergestellt sein. Darüber hinaus kann der Laufradkörper auch mehrteilig, z. B. mit verschraubten Einzelkomponenten aufgebaut sein. Die Schaufeln als vorrangig aerodynamisch wirksame Bauteile umfassen im Allgemeinen ein Schaufelblatt sowie einen Schaufelfuß zur Befestigung am Schaufelradkörper. Auch für die Schaufeln kommen unterschiedlichste Herstellungsverfahren, wie z. B. beispielsweise Schmieden, Gießen, Pressen oder auch Fräsen in Betracht. Axial fans are widely used in the art. An impeller for an axial fan often consists of an impeller body, a plurality of radially outwardly directed blades and elements for attachment of the blades on the impeller body. In addition, often attached to the impeller body Anströmhaube is provided to reduce vortex. The impeller body includes, inter alia, an outer impeller shell for flow guidance, a support disk and a hub for the rotationally fixed coupling of a drive shaft. The impeller body may be integrally formed and in this case z. B. be made by welding, casting or forging. In addition, the impeller body and multi-part, z. B. be constructed with screwed individual components. The blades as primarily aerodynamically active components generally comprise an airfoil and a blade root for attachment to the Schaufelradkörper. Also for the blades come a variety of manufacturing processes, such. For example, forging, casting, pressing or milling into consideration.
Aus der DE 10 2006 001 909 B4 ist ein Laufrad für einen Axialventilator oder einen Axiallüfter bekannt. From DE 10 2006 001 909 B4 an impeller for an axial fan or an axial fan is known.
BESTÄTIGUNGSKOPIE Das Laufrad des Axialventilators umfasst eine zylindrische Tragscheibe sowie eine Vielzahl von Schaufeln, die jeweils einen Schaufelfuß und ein Schaufelblatt aufweisen. Zum mechanisch festen Einspannen einer jeden Schaufel ist jeweils ein Klemmbackenpaar vorgesehen. Die Klemmbacken eines jeden Klemmbackenpaares sind zu diesem Zweck beidseits der Tragscheibe angeordnet und mit dieser verschraubt. Alle Klemmbacken sind bezüglich ihrer Gestalt insoweit identisch, als dass sie beliebig gegeneinander austauschbar sind. Jede Klemmbacke geht in ihrem radial auswärts gerichteten Bereich in eine radial nach außen weisende Schürze über. Die sich partiell überlappenden Schürzen bilden zusammen auf jeder Seite des Laufrades einen umlaufenden Nabenring zur Optimierung der Strömungsführung. Bei Zusammenbau dieses vorbekannten Laufrads lassen sich zudem die Schaufeln vor dem Festspannen in einem von den Klemmbacken definierten Aufnahmenest durch das Anziehen von Durchsteckschrauben und Muttern um ihre eigene Längsachse verdrehen, so dass sich der Anstellwinkel einer jeden Schaufel frei festlegen lässt. Weiterhin sind auf jeder Durchsteckschraube zwei Distanzstücke sowie eine Spannhülse aufgenommen. CONFIRMATION COPY The impeller of the axial fan comprises a cylindrical support disc and a plurality of blades, each having a blade root and an airfoil. For mechanically fixed clamping of each blade a jaw pair is provided in each case. The jaws of each jaw pair are arranged for this purpose on both sides of the support plate and screwed to it. All jaws are identical in terms of their shape insofar as they are arbitrarily interchangeable. Each jaw merges in its radially outwardly directed area into a radially outwardly facing skirt. The partially overlapping aprons together on each side of the impeller form a circumferential hub ring for optimizing the flow guidance. When assembling this known impeller can also rotate the blades before clamping in a defined by the jaws picking test by tightening through bolts and nuts about their own longitudinal axis, so that the angle of attack of each blade can be set freely. Furthermore, two spacers and a clamping sleeve are added to each through-bolt.
Von Nachteil bei dieser Ausführungsform ist, dass die Klemmbacken als Pressteile, Gussteile oder Schmiedeteile mit einer vergleichsweise komplexen dreidimensionalen Geometrie ausgeführt sind.  A disadvantage of this embodiment is that the jaws are designed as pressed parts, castings or forgings with a comparatively complex three-dimensional geometry.
Aufgabe der Erfindung ist es daher, ein Laufrad für einen Axiallüfter anzugeben, das sich unter vorrangiger Verwendung von einfach geformten Standardbauteilen kostengünstig fertigen lässt. The object of the invention is therefore to provide an impeller for an axial fan, which can be manufactured inexpensively using primarily simple-shaped standard components.
Offenbarung der Erfindung Disclosure of the invention
Es wird ein Laufrad für einen Axiallüfter mit einem Laufradkörper offenbart, der einen äußeren Laufradmantel sowie eine Tragscheibe mit einer Nabe zur drehfesten Verbindung mit einer Antriebswelle aufweist, wobei an der Tragscheibe eine Vielzahl von radial nach außen gerichteten Schaufeln angeordnet sind, die jeweils einen Schaufelfuß und ein Schaufelblatt aufweisen. There is disclosed an impeller for an axial fan with an impeller body having an outer impeller shell and a support disc having a hub for rotationally fixed connection to a drive shaft, wherein on the support disc a plurality of radially outwardly directed blades are arranged, each having a blade root and have an airfoil.
Erfindungsgemäß weist jeder Schaufelfuß einen Befestigungsabschnitt auf, der zwischen zwei jeweils beidseitig gegenüberliegend an der Tragscheibe angeordneten trapez-, dreieck-, oder rechteckförmigen Befestigungssegmenten formschlüssig aufgenommen ist und die jeweils zwei gegenüberliegenden Befestigungssegmente sowie die Tragscheibe weisen jeweils mindestens zwei Durchgangsbohrungen zur Aufnahme einer kurzen Hülse und einer langen Hülse auf und der Befestigungsabschnitt ist mit Hilfe von jeweils durch die Hülsen gesteckten Schraubbolzen und Muttern zwischen jeweils zwei gegenüberliegenden Befestigungssegmenten fest einspannbar, wobei jeder Schaufelfuß in jeweils einer Ausnehmung der Tragscheibe geführt ist. According to the invention, each blade root has a fastening portion which is positively received between two trapezoidal, triangular, or rectangular fastening segments arranged opposite each other on both sides of the support disk and the respective two opposite fastening segments and the support disk each have at least two through holes for receiving a short sleeve and a long sleeve and the attachment portion is firmly clamped by means of each inserted through the sleeves bolts and nuts between two opposite fastening segments, each blade root is guided in each case a recess of the support disk.
Infolge dieser konstruktiven Ausgestaltung kann das Laufrad unter Verwendung vergleichsweise einfacher und daher in der Herstellung kostengünstiger Einzelteile gefertigt werden. Darüber hinaus ergibt sich insbesondere eine vereinfachte Fertigung der Schaufelfüße. Die Erfindung ermöglicht ferner die Reduzierung der Teilevielfalt durch die weitgehende Verwendung von Gleichteilen auch bei unterschiedlichen Laufradbaugrößen. Darüber hinaus ergibt sich eine deutliche Gewichtsverringerung im Vergleich zu den herkömmlichen Bauarten. Die Hülsen dienen unter anderem zur Einleitung der hohen Radialkräfte in die Tragscheibe, die nicht zwingend als Scheibe, sondern z. B. auch als eine Speichenkonstruktion oder dergleichen ausgeführt sein kann. Die Ausnehmungen verfügen jeweils über eine rechteckförmige Formgebung. Demzufolge weist die Tragscheibe zwischen jeweils zwei benachbarten Schaufelfüßen einen radial auswärts gerichteten, trapezförmigen Materialbereich bzw. eine zahnradähnliche Umfangskontur auf.  As a result of this structural design, the impeller can be made using comparatively simple and therefore in the production of cost-effective items. In addition, in particular results in a simplified production of the blade roots. The invention also allows the reduction of the variety of parts by the extensive use of identical parts, even with different impeller sizes. In addition, there is a significant reduction in weight compared to the conventional types. The sleeves are used inter alia to initiate the high radial forces in the support plate, which is not mandatory as a disc, but z. B. may also be designed as a spoke construction or the like. The recesses each have a rectangular shape. Accordingly, the support disc between each two adjacent blade roots on a radially outwardly directed, trapezoidal material region or a gear-like peripheral contour.
Im Fall einer vorteilhaften Weiterbildung ist vorgesehen, dass zwischen jeweils zwei gegenüberliegenden Befestigungssegmenten und der Tragscheibe mindestens ein Axialspalt besteht. Gemäß einer Weiterbildung weisen die Hülsen jeweils einseitig einen Bund auf. Bevorzugt handelt es sich um eine kurze und eine länger ausgebildete Hülse, die an einer Stirnseite jeweils einen Bund aufweisen. Die kurzen und die langen Hülsen sind in den Befestigungselementen und der Tragscheibe formschlüssig gesteckt, der Bund der kurzen und der langen Hülse in seiner Zentrierung jedoch nicht.  In the case of an advantageous development, it is provided that at least one axial gap exists between in each case two opposite fastening segments and the carrier disk. According to a further development, the sleeves each have a collar on one side. It is preferably a short and a longer trained sleeve, each having a collar on one end face. The short and long sleeves are positively inserted in the fasteners and the support disk, the collar of the short and the long sleeve in its centering, however, not.
Hierdurch ist eine zumindest einseitige axiale Lagebegrenzung der Hülse in den Durchgangsbohrungen gegeben. Darüber hinaus sind für jede Durchgangsbohrung bzw. jeden Schraubbolzen mit Mutter nur zwei zusätzliche Teile zu montieren.  As a result, an at least one-sided axial position limitation of the sleeve in the through holes is given. In addition, only two additional parts are to be mounted for each through hole or bolt with nut.
Bei einer günstigen Ausführungsform ist jeder Schaufelfuß in einer Bohrung des Laufradmantels geführt.  In a favorable embodiment, each blade root is guided in a bore of the impeller shell.
Hierdurch wird die Lagefixierung der Schaufeln am Laufradkörper verbessert.  As a result, the positional fixation of the blades is improved on the impeller body.
Im Fall einer weiteren Ausführungsform besteht zwischen Schäften einer jeden kurzen und einer jeden langen Hülse ein Ringspalt. Dadurch können fertigungsbedingt auftretende Toleranzen ausgeglichen werden. Gegebenenfalls kann der Axialspalt zwischen Tragscheibe und Befestigungssegment bis auf fast null reduziert werden. In the case of another embodiment, there is an annular gap between shanks of each short and each long sleeve. This can occur due to manufacturing Tolerances are compensated. Optionally, the axial gap between the support disk and mounting segment can be reduced to almost zero.
Nach Maßgabe einer weiteren vorteilhaften Ausgestaltung ist eine Schaftlänge jeder ersten Hülse wesentlich größer als eine Schaftlänge jeder zweiten Hülse. According to a further advantageous embodiment, a shaft length of each first sleeve is substantially larger than a shaft length of each second sleeve.
Hierdurch ist zumindest bei der längeren Hülse eine einfache Sichtkontrolle der Montagelage der Hülse von einer Seite der Tragscheibe aus gegeben, ferner erfolgt eine gleichmäßige Übertragung der Schaufelfliehkräfte auf beide Befestigungssegmente.  As a result, at least in the case of the longer sleeve, a simple visual inspection of the mounting position of the sleeve is given from one side of the carrier disk, and there is also a uniform transmission of the blade centrifugal forces to both fastening segments.
In einer technisch vorteilhaften Weiterbildung überdecken jeweils zwei gegenüberliegende Befestigungssegmente jeweils eine Aussparung der Tragscheibe mit einem jeweils darin geführten Befestigungsabschnitt einer Schaufel. In Verbindung mit den Hülsen ist hierdurch eine besonders zuverlässige und mechanisch hochbelastbare Lagefixierung der Schaufeln an der Tragscheibe gegeben. In a technically advantageous development, in each case two opposite fastening segments each cover a recess of the support disk with a fastening section of a blade guided in each case. In conjunction with the sleeves, this provides a particularly reliable and mechanically highly loadable positional fixing of the blades on the carrier disc.
Bei einer vorteilhaften Weiterbildung ist jeder Befestigungsabschnitt eines Schaufelfußes ein Zylinder mit mindestens einer umfangseitig umlaufenden Ringnut. In an advantageous development of each attachment portion of a blade root is a cylinder with at least one circumferentially circumferential annular groove.
Hierdurch lassen sich die Schaufeln bei der Montage vor dem endgültigen Festspannen zunächst beliebig um ihre Längsachse drehen, so dass die Anstellwinkel der Schaufeln und damit der Mediendurchsatz des Axiallüfters beeinflusst werden kann. Darüber hinaus lässt sich eine solche Zylindergeometrie leicht fertigen.  As a result, the blades can be initially rotated arbitrarily about their longitudinal axis during assembly before the final tightening, so that the angle of attack of the blades and thus the media flow rate of the axial fan can be influenced. In addition, such a cylinder geometry can be easily manufactured.
Kurze Beschreibung der Zeichnungen Brief description of the drawings
Anhand der Zeichnung soll die Erfindung nachstehend eingehender beschrieben werden. With reference to the drawing, the invention will be described below in more detail.
Es zeigt: It shows:
Figur 1 eine Draufsicht auf einen Ausschnitt eines erfindungsgemäßen Laufrades für einen Axiallüfter; Figur 2 einen Querschnitt entlang der Schnittlinie von II-II von Fig. 1 ; und Figure 1 is a plan view of a section of an impeller according to the invention for an axial fan; Figure 2 is a cross-section along the section line of II-II of Figure 1; and
Figur 3 einen Querschnitt entlang der Schnittlinie von III-III von Fig. 1. 3 shows a cross section along the section line of III-III of Fig. 1st
Ausführungsformen embodiments
Die Figur 1 zeigt eine Draufsicht auf einen Ausschnitt eines erfindungsgemäßen Laufrades für einen Axiallüfter. 1 shows a plan view of a section of an impeller according to the invention for an axial fan.
Das Laufrad 10 für einen nicht dargestellten Axiallüfter oder Axialventilator weist unter anderem einen Laufradkörper 12 mit einem äußeren Laufradmantel 14 sowie einer Tragscheibe 16 auf. An der im Wesentlichen scheibenförmigen bzw. zylindrischen Tragscheibe 16 des Laufradkörpers 12 ist zentrisch eine Nabe 18 zur drehfesten Verbindung mit einer Antriebswelle 20 angeordnet. An der Tragscheibe 16 ist eine Vielzahl von Schaufeln befestigt, von denen eine Schaufel repräsentativ mit der Bezugsziffer 22 versehen ist. Die Schaufel 22 verfügt über einen Schaufelfuß 24 sowie ein Schaufelblatt 26. Der Schaufelfuß 24 der Schaufel 22 ist, wie alle übrigen auch, zwischen zwei gegenüberliegend an der Tragscheibe 16 befestigten trapez-, rechteck- oder dreieckförmigen Befestigungssegmenten fest eingespannt, von denen hier nur ein vorderes trapez-, rechteck- oder auch dreieckförmiges Befestigungssegment 28 sichtbar ist. Die mechanische Verspannung der jeweils zwei gegenüberliegend an der Tragscheibe 16 positionierten Befestigungssegmente sowie deren Verbindung mit der Tragscheibe 16 erfolgt mit Hilfe von mindestens zwei Schraubbolzen 30 bis 36 sowie hier gleichermaßen verdeckt liegenden Muttern. Vor dem Verspannen der Befestigungssegmente lässt sich die Schaufel 22, wie die übrigen auch, jeweils frei um ihre Drehachse 38 verschwenken, so dass sich für unterschiedliche Anwendungsszenarien optimale Anstellwinkel der Schaufeln 22 des Laufrads 10 einstellen lassen.  The impeller 10 for an axial fan or axial fan, not shown, has inter alia an impeller body 12 with an outer impeller shell 14 and a support plate 16. At the substantially disc-shaped or cylindrical support disk 16 of the impeller body 12, a hub 18 is arranged for rotationally fixed connection with a drive shaft 20 centrally. Attached to the support disk 16 are a plurality of blades, one blade of which is representatively designated by the reference numeral 22. The blade 22 has a blade root 24 and an airfoil 26. The blade root 24 of the blade 22 is, like all others, firmly clamped between two oppositely mounted on the support plate 16 trapezoidal, rectangular or triangular fastening segments, of which only one front trapezoidal, rectangular or triangular fastening segment 28 is visible. The mechanical tension of each two oppositely positioned on the support plate 16 fastening segments and their connection to the support plate 16 by means of at least two bolts 30 to 36 and here equally concealed nuts. Prior to clamping the fastening segments, the blade 22, like the others, can be pivoted freely around its axis of rotation 38 so that optimal angles of attack of the blades 22 of the rotor 10 can be set for different application scenarios.
Die Figur 2 illustriert einen Querschnitt entlang der Schnittlinie von II-II von Fig. 1. FIG. 2 illustrates a cross-section along the section line of II-II of FIG. 1.
Das Befestigungssegment 28 ist mittels der Schraubbolzen 32, 36 und den auf diese aufgeschraubten Muttern 40, 42 mit einem gegenüberliegend an der Tragscheibe 16 angeordneten, weiteren Befestigungssegment 44 verspannt und mit der Tragscheibe 16 verbunden. Dasselbe gilt für die hier verdeckten Schraubbolzen 30, 34 mit ihren zugehörigen Muttern. Oberhalb der beiden Befestigungssegmente 28, 44 verläuft der zwischen den Befestigungssegmenten 28, 44 eingespannte Schaufelfuß 24 der Schaufel 22.The fastening segment 28 is braced by means of the threaded bolts 32, 36 and the nuts 40, 42 screwed onto these with a further fastening segment 44 disposed opposite to the support disk 16, and with the support disk 16 connected. The same applies to the here concealed bolts 30, 34 with their associated nuts. Above the two fastening segments 28, 44 extends between the fastening segments 28, 44 clamped blade root 24 of the blade 22nd
Jeder Schraubbolzen 32, 36 ist jeweils in einer langen Hülse 46 und einer kurzen Hülse 48 sowie einer weiteren langen Hülse 50 und einer weiteren kurzen Hülse 52 aufgenommen, deren der besseren zeichnerischen Übersicht halber nicht bezeichneten Schäfte jeweils durch einen Ringspalt 54, 56 voneinander separiert sind. Die Hülsen 46 bis 52 weisen jeweils eine hohlzylindrische Form auf und die Ringspalte 54, 56 können auch ungefähr eine Breite von null aufweisen. Each bolt 32, 36 is in each case in a long sleeve 46 and a short sleeve 48 and another long sleeve 50 and another short sleeve 52 added, whose better illustrative overview half unsigned shafts are separated by an annular gap 54, 56 from each other , The sleeves 46 to 52 each have a hollow cylindrical shape and the annular gaps 54, 56 may also be approximately zero in width.
Die gleichfalls nicht bezeichnete Schaftlänge der langen Hülsen 46, 50 ist wesentlich größer als eine Schaftlänge der kurzen Hülsen 48, 52. Die Hülsen 46 bis 52 sind jeweils in einer zylindrischen Durchgangsbohrung 58, 60, die die beiden Befestigungssegmente 28, 44 sowie die Tragscheibe 16 vollständig durchsetzt, aufgenommen. Ein Radialspiel zwischen den Hülsen 46 bis 52 sowie den Durchgangsbohrungen 58, 60 liegt vorzugsweise in der Größenordnung von null. Gegebenenfalls kann auch eine leichte Presspassung vorgesehen sein. Die Durchgangsbohrungen 58, 60 können jeweils zylindrische Senkungen 62 bis 68 aufweisen, in denen die Hülsen 46 bis 52 aufgenommen sind. Ein jeweiliger Bund 70, 72, 74 oder 76 der Hülsen 46 bis 52 ist nicht formschlüssig aufgenommen, sondern nur die Schäfte der Hülsen 46 bis 52. Die Senkungen 62 bis 68 sind hierbei jeweils in nicht bezeichnete und von der Tragscheibe 16 weggerichtete Oberseiten der beiden Befestigungssegmente 28, 44 eingebracht. Zwischen den Innenseiten 78, 80 der beiden Befestigungssegmente 28, 44 und der Tragscheibe 16 besteht hier exemplarisch jeweils ein Axialspalt 82, 84, der jeweils deutlich kleiner als die Ringspalte 54, 56 zwischen der langen und der kurzen Hülse 46, 48 sowie der weiteren langen und weiteren kurzen Hülse 50, 52 ist. Die Hülsen 46 bis 52 dienen vorrangig zur Aufnahme der bei Axiallüftern auf die Schaufeln einwirkenden hohen Zentrifugalkräfte, während die Bünde 70, 72, 74, 76 eine ähnliche Funktion für die Köpfe von Schraubbolzen sowie die Muttern wie konventionelle, separate Unterleger haben. The likewise not designated shaft length of the long sleeves 46, 50 is substantially larger than a shaft length of the short sleeves 48, 52. The sleeves 46 to 52 are each in a cylindrical through hole 58, 60, which are the two fastening segments 28, 44 and the support plate sixteenth completely penetrated, added. A radial clearance between the sleeves 46 to 52 and the through holes 58, 60 is preferably of the order of zero. Optionally, a slight interference fit may be provided. The through holes 58, 60 may each have cylindrical counterbores 62 to 68 in which the sleeves 46 to 52 are received. A respective collar 70, 72, 74 or 76 of the sleeves 46 to 52 is not positively received, but only the shafts of the sleeves 46 to 52. The countersinks 62 to 68 are in each case in non-designated and away from the support plate 16 tops of the two Attachment segments 28, 44 introduced. Between the inner sides 78, 80 of the two fastening segments 28, 44 and the support disk 16 is here in each case an axial gap 82, 84, each clearly smaller than the annular gaps 54, 56 between the long and the short sleeve 46, 48 and the other long and another short sleeve 50, 52. The sleeves 46 to 52 serve primarily to accommodate the axial centrifugal forces acting on the blades high centrifugal forces, while the collars 70, 72, 74, 76 have a similar function for the heads of bolts and the nuts as conventional, separate pads.
Entsprechend zum vorstehend erläuterten Aufbau sind die hier verdeckten Schraubbolzen sowie alle weiteren Schraubbolzen in Hülsen gleicher konstruktiver Ausgestaltung eingesetzt. Von Bedeutung ist, dass die Befestigungssegmente 28, 44 nicht zwingend an der Tragscheibe 16 anliegen - d. h. beide Axialspalte 82, 84 in dieser Konstellation größer als null sind - aber gleichwohl können.  According to the structure described above, the hidden here screw bolts and all other bolts are used in sleeves of the same structural design. It is important that the fastening segments 28, 44 do not necessarily rest on the support plate 16 - d. H. both axial gaps 82, 84 in this constellation are greater than zero - but nevertheless can.
Die Figur 3 zeigt einen Querschnitt entlang der Schnittlinie von III-III von Fig. 1. Der unterseitig am Schaufelblatt 26 der Schaufel 22 bevorzugt integral ausgebildete Schaufelfuß 24 verfügt über einen konturierten Befestigungsabschnitt 90. Der konturierte Befestigungsabschnitt 90 ist als Zylinder 92 mit einer darin eingelassenen, umfangsseitig umlaufenden Ringnut 94 ausgeformt. Jedes Befestigungssegment 28, 44 verfügt über eine mit einer punktierten Linie symbolisierte Aussparung 96, 98, in der der Befestigungsabschnitt 90 passgenau formschlüssig aufgenommen ist. Durch das Anziehen der Schraubbolzen (vgl. Fig. 1 , 2) werden die Befestigungssegmente 28, 44 mit dem konturierten Befestigungsabschnitt 90 des Schaufelfußes 24 mechanisch verspannt, wodurch sich im Zusammenspiel mit dem Formschluss und den Hülsen 46 bis 52 eine mechanisch in höchstem Maße zuverlässige Befestigung der Schaufel 22 an der Tragscheibe 16 ergibt. FIG. 3 shows a cross section along the section line of III-III of FIG. 1. The underside of the blade 26 of the blade 22 preferably integrally formed blade root 24 has a contoured mounting portion 90. The contoured mounting portion 90 is formed as a cylinder 92 with a recessed, circumferentially encircling annular groove 94. Each fastening segment 28, 44 has a recess 96, 98 symbolized by a dotted line, in which the fastening section 90 is received in a form-fitting manner with an exact fit. By tightening the bolts (see Fig. 1, 2), the fastening segments 28, 44 mechanically clamped to the contoured mounting portion 90 of the blade root 24, whereby in interaction with the positive connection and the sleeves 46 to 52 a mechanically highly reliable Attachment of the blade 22 to the support plate 16 results.
In den Laufradmantel 14 ist eine Bohrung 100 zur Durchführung des Befestigungsabschnitts 90 des Schaufelfußes 24 eingebracht. In die Tragscheibe 16 ist unterhalb des Schaufelfußes 24 eine in etwa rechteckförmige Ausnehmung 102 eingebracht, die zur Aufnahme des Schaufelfußes 24 notwendig ist. Demzufolge ist eine Umfangskontur der Tragscheibe 16 zahnradartig ausgebildet, dergestalt, dass zwischen jeweils zwei benachbarten Ausnehmungen jeweils ein radial auswärts gerichteter trapezförmiger Materialbereich verbleibt. Sowohl die Bohrung 100 als auch die Ausnehmung 102 dienen zur Optimierung der Führung der Schaufel 22 an der Tragscheibe 16. Zwischen den Innenseiten 78, 80 der beiden Befestigungssegmente 28, 44 und der Tragscheibe 16 bestehen wiederum die Axialspalte 82, 84. Die übrigen nicht bezeichneten bzw. nicht dargestellten Schaufeln des Laufrades 10 sind auf dieselbe Art und Weise mit der Tragscheibe 16 verbunden.  In the impeller shell 14, a bore 100 for the implementation of the fastening portion 90 of the blade root 24 is introduced. In the support plate 16, an approximately rectangular recess 102 is inserted below the blade root 24, which is necessary for receiving the blade root 24. Accordingly, a circumferential contour of the support plate 16 is formed like a toothed wheel, such that in each case a radially outwardly directed trapezoidal material region remains between each two adjacent recesses. Both the bore 100 and the recess 102 serve to optimize the guidance of the blade 22 on the support disk 16. Between the inner sides 78, 80 of the two fastening segments 28, 44 and the support disk 16 again consist of the axial gaps 82, 84. The rest not designated or not shown blades of the impeller 10 are connected in the same manner with the support disk 16.

Claims

Patentansprüche claims
1. Laufrad (10) für einen Axiallüfter mit einem Laufradkörper (12), der einen äußeren Laufradmantel (14) sowie eine Tragscheibe (16) mit einer Nabe (18) zur drehfesten Verbindung mit einer Antriebswelle (20) aufweist, wobei an der Tragscheibe (16) eine Vielzahl von radial nach außen gerichteten Schaufeln (22) angeordnet ist, die jeweils einen Schaufelfuß (24) und ein Schaufelblatt (26) aufweisen, dadurch gekennzeichnet, dass jeder Schaufelfuß (24) einen Befestigungsabschnitt (90) aufweist, der zwischen zwei jeweils beidseitig gegenüberliegend an der Tragscheibe (16) angeordneten Befestigungssegmenten (28, 44) formschlüssig aufgenommen ist und die jeweils zwei gegenüberliegenden Befestigungssegmente (28, 44) sowie die Tragscheibe (16) jeweils mindestens zwei Durchgangsbohrungen (58, 60) zur Aufnahme von Hülsen (46, 48, 50, 52) aufweisen und der Befestigungsabschnitt (90) mit Hilfe von jeweils durch die Hülsen (46, 48, 50, 52) gesteckten Schraubbolzen (30, 32, 34, 36) und Muttern (40, 42) zwischen jeweils zwei gegenüberliegenden Befestigungssegmenten (28, 44) fest einspannbar ist, wobei jeder Schaufelfuß (24) in jeweils einer Ausnehmung (102) der Tragscheibe (16) geführt ist. An impeller (10) for an axial fan with an impeller body (12) having an outer impeller shell (14) and a support disc (16) with a hub (18) for non-rotatable connection to a drive shaft (20), wherein on the support disc (16) a plurality of radially outwardly directed blades (22) are arranged, each having a blade root (24) and an airfoil (26), characterized in that each blade root (24) has a mounting portion (90) which between two fastening segments (28, 44) arranged on both sides opposite one another on the support disk (16) are positively accommodated and the respective two opposite fastening segments (28, 44) and the support disk (16) each have at least two through bores (58, 60) for receiving sleeves (46, 48, 50, 52) and the fixing portion (90) by means of respectively by the sleeves (46, 48, 50, 52) inserted screw bolts (30, 32, 34, 36) and Mu (40, 42) between each two opposite fastening segments (28, 44) is firmly clamped, each blade root (24) in each case a recess (102) of the support disc (16) is guided.
2. Laufrad (10) nach Anspruch 1 , wobei zwischen jeweils zwei gegenüberliegenden Befestigungssegmenten (28, 44) und der Tragscheibe (16) mindestens ein Axialspalt (82, 84) besteht. Second impeller (10) according to claim 1, wherein between each two opposite fastening segments (28, 44) and the support disc (16) at least one axial gap (82, 84).
3. Laufrad (10) nach Anspruch 1, wobei jeweils zwei gegenüberliegende Befestigungssegmente (28, 44) spaltfrei an der Tragscheibe (16) anliegen. 3. impeller (10) according to claim 1, wherein in each case two opposite fastening segments (28, 44) abut gap-free on the support disc (16).
4. Laufrad (10) nach einem der Ansprüche 1 bis 3, wobei die Hülsen (46, 48, 50, 52) jeweils einseitig einen Bund (70, 72, 74, 76) aufweisen und der Schaft zumindest bereichsweise formschlüssig in jeweils einer der Durchgangsbohrungen (58, 60) in den Befestigungssegmenten (28, 44) aufgenommen ist. 4. impeller (10) according to any one of claims 1 to 3, wherein the sleeves (46, 48, 50, 52) on each side a collar (70, 72, 74, 76) and the shaft at least partially positively in each one of Through holes (58, 60) in the fastening segments (28, 44) is received.
5. Laufrad (10) nach einem der Ansprüche 1 bis 4, wobei jeder Schaufelfuß (24) in einer Bohrung (100) des Laufradmantels (14) geführt ist. 5. impeller (10) according to any one of claims 1 to 4, wherein each blade root (24) in a bore (100) of the impeller shell (14) is guided.
6. Laufrad (10) nach einem der Ansprüche 1 bis 5, wobei zwischen Schäften jeder langen Hülse (46, 50) und jeder kurzen Hülse (48, 52) ein Ringspalt (54, 56) besteht. 6. impeller (10) according to any one of claims 1 to 5, wherein between shanks of each long sleeve (46, 50) and each short sleeve (48, 52) an annular gap (54, 56).
7. Laufrad (10) nach einem der Ansprüche 1 bis 6, wobei eine Schaftlänge jeder langen Hülse (46, 50) wesentlich größer als eine Schaftlänge jeder kurzen Hülse (48, 52) ist. The impeller (10) of any one of claims 1 to 6, wherein a shaft length of each long sleeve (46, 50) is substantially greater than a shaft length of each short sleeve (48, 52).
8. Laufrad (10) nach einem der Ansprüche 1 bis 7, wobei jeweils zwei gegenüberliegende Befestigungssegmente (28, 44) jeweils eine Ausnehmung (102) der Tragscheibe (16) mit einem jeweils darin geführten Befestigungsabschnitt (90) einer Schaufel (22) überdecken. 8. impeller (10) according to any one of claims 1 to 7, wherein each two opposite fastening segments (28, 44) each cover a recess (102) of the support disc (16) with a respectively guided therein fixing portion (90) of a blade (22) ,
9. Laufrad (10) nach einem der Ansprüche 1 bis 8, wobei jeder Befestigungsabschnitt (90) eines Schaufelfußes (24) ein Zylinder (92) mit mindestens einer umfangseitig umlaufenden Ringnut (94) ist. 9. impeller (10) according to any one of claims 1 to 8, wherein each fixing portion (90) of a blade root (24) is a cylinder (92) having at least one circumferentially circumferential annular groove (94).
EP15730394.2A 2014-06-24 2015-06-16 Impeller for axial fans Active EP3030792B1 (en)

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RU2645887C2 (en) 2018-02-28
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WO2015197167A1 (en) 2015-12-30
AU2015281410B2 (en) 2017-10-26
US10132326B2 (en) 2018-11-20
CN105637227A (en) 2016-06-01
AU2015281410A1 (en) 2016-03-24
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US20170122335A1 (en) 2017-05-04
RU2016115551A (en) 2017-10-26

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