EP3475580B1 - Fan wheel disc and fan wheel - Google Patents

Fan wheel disc and fan wheel Download PDF

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Publication number
EP3475580B1
EP3475580B1 EP17734033.8A EP17734033A EP3475580B1 EP 3475580 B1 EP3475580 B1 EP 3475580B1 EP 17734033 A EP17734033 A EP 17734033A EP 3475580 B1 EP3475580 B1 EP 3475580B1
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EP
European Patent Office
Prior art keywords
fan wheel
blade
disc
section
impeller
Prior art date
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EP17734033.8A
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German (de)
French (fr)
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EP3475580A1 (en
Inventor
Alexander Konzal
Erhard Gruber
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Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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Publication of EP3475580A1 publication Critical patent/EP3475580A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2205—Conventional flow pattern
    • F04D29/2222—Construction and assembly
    • 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • 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
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of fans

Definitions

  • the invention relates to an impeller with an impeller disc.
  • Impeller discs are used as base or cover discs on impellers for fans. Application examples include radial impellers or diagonal impellers. A distinction is made between one-piece, i. H. One-piece impellers from multi-piece, d. H. impellers composed of several parts.
  • the impeller blades are with the Connected base and/or cover plate, usually welded.
  • the impeller blades must be brought into a shape at their respective axial end edges that corresponds to the shape of the impeller disk. Since the impeller disks usually have differently curved and/or spherical sections from radially inside to radially outside, the axial end edges must be cut to length using sometimes complex spatial cuts, so that the axial end edges can be brought to rest flat on the impeller blade and fastened.
  • cutting guides for cutting the impeller blades to length are technically possible, for example by laser cutting, they are time-consuming and expensive. They are unsuitable for mass production.
  • the invention is therefore based on the object of providing a fan wheel which is designed in such a way that spatial cuts for cutting the fan wheel blades to length and their adaptation to spatially curved areas of the fan wheel disc can be dispensed with.
  • an impeller is proposed with the features of patent claim 1 comprising an impeller disk and at least one impeller blade, wherein the impeller disk comprises at least one area which is curved at least in sections from radially inward to radially outward.
  • connection level is clearly set to one level in advance and corresponds to a predefined level in space. Due to the fact that the blade connection surface runs exclusively within one plane, it can be provided that the axial end edges of the impeller blades to be fastened are also only along this one connection plane and are therefore not spatially curved or spherically cut to length. About a straight Section along the axial end edges of the impeller blades in this one predefined plane, the end edges can be brought into a shape that matches the impeller disk or the connection surfaces of the impeller disk. The axial end edges of the impeller blades therefore have the same course as each of the connection surfaces of the impeller disk and can be placed and fastened to the connection surfaces, for example welded, without further processing steps.
  • a large number of corresponding connection surfaces for a corresponding number of impeller blades are provided in the circumferential direction.
  • the adaptation of the impeller disk in the form according to the invention simplifies and accelerates the production of an impeller with a complex spatial component geometry.
  • the impeller disk is plastically deformed at least in sections along the at least one blade connection surface.
  • the plastic deformation enables the geometry of the impeller disk to be adapted precisely in the area where the impeller blades are connected, without influencing the flow of the other areas.
  • the at least one blade connection surface of the impeller disk is formed in a press-fit section, which is pressed into the impeller disk by plastic deformation in the axial direction.
  • the direction along the axis of rotation of the impeller disk is defined as the axial direction.
  • different axial press-in depths can be realized via the press-in section in order to shape the spatial extension of the connection surfaces within one connection plane, even if the fan wheel disc geometry has strong spatial curvatures when viewed in cross section. This means that the extension of the disk body of the impeller disk can run in other planes and, above all, curved, whereas the blade connection surface extends exclusively in the connection level.
  • the press-in section has a deformation section that is plastically deformed in the axial direction and protrudes axially relative to a disk surface and extends along the connection plane.
  • a deformation section that is plastically deformed in the axial direction and protrudes axially relative to a disk surface and extends along the connection plane.
  • the shape of the axially projecting deformation section which thus directly influences the flow, can also be adjusted.
  • the deformation section has an inlet section for the flow, seen in the circumferential direction, which forms a rounded leading edge.
  • the deformation section has a variable width along its extent in the circumferential direction.
  • an embodiment is advantageous in which the deformation section has a substantially oval shape or a cross-sectional shape of an airfoil profile in an axial plan view.
  • the latter is also an example of likewise included embodiment variant, in which the width of the deformation section along its extension in the circumferential direction in an outlet section is reduced in a fluidically favorable manner.
  • the fan wheel disk according to the invention can basically be used as a base disk or cover disk of a fan wheel, with the base disks usually having a large, horizontally flat section in which there is no problematic spatially curved geometry.
  • the cover disks are often strongly curved from radially inside to radially outside. Such a curvature is present in a fan wheel disk tapering in a funnel shape towards the axis of rotation, which represents an exemplary embodiment of the invention.
  • Part of the invention is a multi-part impeller that includes at least one impeller disk.
  • the impeller typically includes a plurality, but at least one, impeller blades having first and second axial facing edges.
  • one of the axial front edges has a shape that corresponds to the press-in section of the impeller disk.
  • a corresponding shape can also generally be provided on both a cover disk and a base disk, in which press-in sections are formed on the corresponding disks and front edges of the impeller blades.
  • the invention is then used both on the cover pane and on the bottom pane. In such a case, the impeller blades are also cut to length on both axial end edges in one plane each.
  • the impeller it is provided according to the invention that at least one of the axial front edges of the at least one impeller blade runs completely along the connection plane. This ensures that the front edge faces the blade connection surface on the impeller blade fits and lies flat against it.
  • the impeller blades are therefore trimmed or cut to length along their front edge in such a way that they are geometrically adapted to the respective blade connection surface of the impeller disk and the front edge surface and blade connection surface run in the same plane.
  • the end edge of the at least one fan wheel blade facing the fan wheel disk runs completely within the press-in section of the fan wheel disk and rests on the blade connection surface on the axial side.
  • the blade connection area is determined by the axial bottom area of the press-in section.
  • the axial end edge of the at least one impeller blade is curved in an axial plan view.
  • Inherently curved impeller blades can be implemented without any problems, since their front edges are not only cut along a line, but along a defined plane.
  • the shape of the connection surfaces, press-in sections and/or deformation sections then preferably have a correspondingly curved shape.
  • a fan wheel disc 1 designed as a cover disc is shown in a view from below and a side view.
  • the impeller disk 1 has a flow opening 2 in the central area around the axis of rotation R.
  • the disk body of the impeller disk 1 is funnel-shaped and has an area 3 that defines the funnel shape and extends in a curved manner from radially inward to radially outward.
  • the disc body transitions from an extension at the radial peripheral edge 22, which essentially corresponds to a radial plane, to an extension at the flow opening edge 21, which essentially corresponds to an axial plane.
  • a plurality of circumferentially spaced blade attachment surfaces 4 are formed, to which axial end faces of impeller blades are attached, as is shown in FIGS Figures 3 and 4 is shown by way of example.
  • Each of the blade connection surfaces 4 extends over its entire length from radially inside to radially outside along the defined connection plane E.
  • Each blade connection surface 4 is formed in a press-fit section 6 that is plastically deformed into the disk surface 9 , in each case on the axial bottom surface of the respective press-fit section 6 .
  • the plastic deformation of the press-in sections 6 penetrates the entire disc body and forms an axially protruding deformation section 7 on the axially opposite side of the disc surface 9, which extends along the connection plane E, as shown in FIG figure 2 can be seen.
  • the disk connection surfaces 4 axially opposite outer surfaces 14 run parallel to the disk connection surfaces 4. Due to the plastic deformation, the deformation sections 7 each form opposite the Disc body axially projecting side walls 5, the slope and shape is fluidically adjustable.
  • the disk connection surfaces 4 run from radially inside to radially outside and in the circumferential direction over an angle of more than 30°.
  • the press-in sections 5 extend from the radial peripheral edge 22 to a radially inner area of the impeller disk 1, in which their course changes into an exclusive axial extension.
  • the disk connection surfaces 4 each have the shape of an airfoil profile with a maximum width B, with the disk connection surfaces 4 tapering from the maximum width B in both flow directions.
  • the deformation sections 7 each have an inlet section 11 with a rounded leading edge 13 and an outlet section 12 tapering essentially to a point.
  • FIG 3 is an impeller 30 with an impeller disc 1 according to FIG Figures 1 and 2 shown in a side view.
  • the impeller 30 has a plurality of impeller blades 16 spaced apart in the circumferential direction, which are fastened with their respective lower axial front edge to the bottom disk 17 and with their respective upper axial front edge to the impeller disk 1 designed as a cover disk.
  • the upper axial end edges extend over the entire surface, bearing against the disc connection surfaces 4 within the press-in sections 6 and therefore along the connection plane E.
  • the impeller blades 16 penetrate the disc body of the impeller disc 1 with their axial edges and are surrounded by the deformation sections 7.
  • the upper front edge surfaces of the impeller blades 16 have a shape that corresponds to the disk connection surfaces 4, so that the shape of the disk connection surfaces 4 in figure 1 is referenced.
  • the curved shape of each of the impeller blades 16 is also understandable.
  • the impeller blades 1 are spaced radially inwards relative to a radial peripheral edge of the bottom disk 17 .
  • the Fan wheel disk 1 like the disk connection surfaces 4, the fan wheel blades 16 run up to their radial peripheral edge 22 and, in the exemplary embodiment shown, are essentially flush.

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

Description

Die Erfindung betrifft ein Gebläserad mit einer Gebläseradscheibe.The invention relates to an impeller with an impeller disc.

Gebläseradscheiben werden als Boden- oder Deckscheiben bei Gebläserädern für Ventilatoren eingesetzt. Anwendungsbeispiele sind unter Anderem Radialgebläseräder oder Diagonalgebläserader. Dabei unterscheidet man einteilige, d. h. aus einem Teil gefertigte Gebläseräder von mehrteiligen, d. h. aus mehreren Teilen zusammengesetzten Gebläserädern.Impeller discs are used as base or cover discs on impellers for fans. Application examples include radial impellers or diagonal impellers. A distinction is made between one-piece, i. H. One-piece impellers from multi-piece, d. H. impellers composed of several parts.

Druckschriftlicher Stand der Technik ist beispielsweise offenbart in den Schriften DE 20 2015 105 729 U1 oder DE 20 2011 052 411 U1 . Weitere Druckschriften des Stands der Technik im vorliegenden technischen Gebiet sind durch die Dokumente US 2007/098556 A1 , JP 2007-120445 A , US 2002/028138 A1 , US 6,416,285 B1 und JP 2001-140789 A bekannt.Printed prior art is disclosed, for example, in the documents DE 20 2015 105 729 U1 or DE 20 2011 052 411 U1 . Other prior art references in the present technical field are through the documents U.S. 2007/098556 A1 , JP 2007-120445 A , U.S. 2002/028138 A1 , US 6,416,285 B1 and JP 2001-140789 A known.

Bei mehrteiligen Gebläserädern werden die Gebläseradschaufeln mit der Boden- und/oder Deckscheibe verbunden, zumeist verschweißt. Die Gebläseradschaufeln müssen hierfür an ihren jeweiligen axialen Stirnkanten in eine Form gebracht werden, die der Form der Gebläseradscheibe entspricht. Nachdem die Gebläseradscheiben zumeist von radial innen nach radial au-βen unterschiedlich gekrümmte und/oder sphärische Abschnitte aufweisen, müssen die axialen Stirnkanten über teilweise komplexe räumliche Schnittführungen abgelängt werden, so dass die axialen Stirnkanten flächig an der Gebläseradschaufel zur Anlage gebracht und befestigt werden können. Derartige Schnittführungen zum Ablängen der Gebläseradschaufeln sind zwar technisch möglich, beispielsweise durch Laserschneiden, jedoch zeit- und kostenaufwendig. Für die Massenfertigung sind sie ungeeignet.In multi-piece impellers, the impeller blades are with the Connected base and/or cover plate, usually welded. For this purpose, the impeller blades must be brought into a shape at their respective axial end edges that corresponds to the shape of the impeller disk. Since the impeller disks usually have differently curved and/or spherical sections from radially inside to radially outside, the axial end edges must be cut to length using sometimes complex spatial cuts, so that the axial end edges can be brought to rest flat on the impeller blade and fastened. Although such cutting guides for cutting the impeller blades to length are technically possible, for example by laser cutting, they are time-consuming and expensive. They are unsuitable for mass production.

Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Gebläserad bereitzustellen, das derart ausgebildet ist, dass auf räumliche Schnitte zur Ablängung der Gebläseradschaufeln und deren Anpassung an räumlich gekrümmte Bereiche der Gebläseradscheibe verzichtet werden kann.The invention is therefore based on the object of providing a fan wheel which is designed in such a way that spatial cuts for cutting the fan wheel blades to length and their adaptation to spatially curved areas of the fan wheel disc can be dispensed with.

Diese Aufgabe wird durch die Merkmalskombination gemäß Patentanspruch 1 gelöst.This object is achieved by the combination of features according to claim 1.

Erfindungsgemäß wird ein Gebläserad mit den Merkmalen des Patentanspruchs 1 umfassend eine Gebläseradscheibe und mindestens eine Gebläseradschaufel, wobei die Gebläseradscheibe mindestens einen sich zumindest abschnittsweise von radial innen nach radial außen gekrümmt erstreckenden Bereich umfasst, vorgeschlagen..According to the invention, an impeller is proposed with the features of patent claim 1 comprising an impeller disk and at least one impeller blade, wherein the impeller disk comprises at least one area which is curved at least in sections from radially inward to radially outward.

Die Anbindungsebene ist vorab eindeutig auf eine Ebene festgelegt und entspricht einer vordefinierten Ebene im Raum. Dadurch, dass die Schaufelanbindungsfläche ausschließlich innerhalb einer Ebene verläuft, kann vorgesehen werden, dass die axialen Stirnkanten der zu befestigenden Gebläseradschaufeln ebenfalls nur entlang dieser einen Anbindungsebene und mithin nicht räumlich gekrümmt oder sphärisch abzulängen sind. Über einen geraden Schnitt entlang der axialen Stirnkanten der Gebläseradschaufeln in dieser einen vordefinierten Ebene können die Stirnkanten in eine zu der Gebläseradscheibe bzw. den Anbindungsflächen der Gebläseradscheibe passende Form gebracht werden. Die axialen Stirnkanten der Gebläseradschaufeln weisen mithin denselben Verlauf auf wie jede der Anbindungsflächen der Gebläseradscheibe und können ohne weitere Bearbeitungsschritte an die Anbindungsflächen gesetzt und befestigt, beispielsweise verschweißt werden. In einer Ausführungsform ist in Umfangsrichtung eine Vielzahl von entsprechenden Anbindungsflächen für eine entsprechende Anzahl von Gebläseradschaufeln vorgesehen. Die Anpassung der Gebläseradscheibe in der erfindungsgemäßen Form vereinfacht und beschleunigt die Herstellung eines Gebläserads mit komplexer räumlicher Bauteilgeometrie.The connection level is clearly set to one level in advance and corresponds to a predefined level in space. Due to the fact that the blade connection surface runs exclusively within one plane, it can be provided that the axial end edges of the impeller blades to be fastened are also only along this one connection plane and are therefore not spatially curved or spherically cut to length. About a straight Section along the axial end edges of the impeller blades in this one predefined plane, the end edges can be brought into a shape that matches the impeller disk or the connection surfaces of the impeller disk. The axial end edges of the impeller blades therefore have the same course as each of the connection surfaces of the impeller disk and can be placed and fastened to the connection surfaces, for example welded, without further processing steps. In one embodiment, a large number of corresponding connection surfaces for a corresponding number of impeller blades are provided in the circumferential direction. The adaptation of the impeller disk in the form according to the invention simplifies and accelerates the production of an impeller with a complex spatial component geometry.

Erfindungsgemäß ist vorgesehen, dass die Gebläseradscheibe entlang der mindestens einen Schaufelanbindungsfläche zumindest abschnittsweise plastisch verformt ist. Die plastische Verformung ermöglicht eine Anpassbarkeit der Gebläseradscheibengeometrie genau in dem Bereich der Anbindung der Gebläseradschaufeln, ohne die übrigen Bereiche strömungstechnisch zu beeinflussen.According to the invention, it is provided that the impeller disk is plastically deformed at least in sections along the at least one blade connection surface. The plastic deformation enables the geometry of the impeller disk to be adapted precisely in the area where the impeller blades are connected, without influencing the flow of the other areas.

Erfidungsgemäß wird dabei die mindestens eine Schaufelanbindungsfläche der Gebläseradscheibe in einem Einpressabschnitt ausgebildet ist, der durch plastische Verformung in axialer Richtung in die Gebläseradscheibe eingedrückt ist. Als axiale Richtung ist hierbei die Richtung entlang der Rotationsachse der Gebläseradscheibe definiert. Über den Einpressabschnitt sind ferner unterschiedliche axiale Einpresstiefen realisierbar, um die räumliche Erstreckung der Anbindungsflächen innerhalb der einen Anbindungsebene zu gestalten, selbst wenn die Gebläseradscheibengeometrie im Querschnitt gesehen starke räumliche Krümmungen aufweist. Das bedeutet, die Erstreckung des Scheibenkörpers der Gebläseradscheibe kann in anderen Ebenen und vor allem gekrümmt verlaufen, wohingegen sich die Schaufelanbindungsfläche ausschließlich in der Anbindungsebene erstreckt.According to the invention, the at least one blade connection surface of the impeller disk is formed in a press-fit section, which is pressed into the impeller disk by plastic deformation in the axial direction. In this case, the direction along the axis of rotation of the impeller disk is defined as the axial direction. Furthermore, different axial press-in depths can be realized via the press-in section in order to shape the spatial extension of the connection surfaces within one connection plane, even if the fan wheel disc geometry has strong spatial curvatures when viewed in cross section. This means that the extension of the disk body of the impeller disk can run in other planes and, above all, curved, whereas the blade connection surface extends exclusively in the connection level.

In einem Ausführungsbeispiel weist der Einpressabschnitt einen in axialer Richtung plastisch verformten und gegenüber einer Scheibenoberfläche axial vorstehenden Verformungsabschnitt auf, der sich entlang der Anbindungsebene erstreckt. Das bedeutet, dass die plastische Verformung der Gebläseradscheibe zur Erzeugung der Schaufelanbindungsflächen so stark ist, dass die Verformungsabschnitte auf einer axialen Seite der Gebläseradscheibe hervortreten, die der Seite gegenüberliegt, auf der die Gebläseradschaufeln angeordnet werden. Die Bildung eines vorstehenden Verformungsabschnitts erweitert die geometrische Anpassbarkeit der Schaufelanbindungsflächen der Gebläseradscheibe, so dass eine Erstreckung innerhalb der einen Anbindungsebene realisierbar ist, selbst wenn die Krümmung des Scheibenkörpers der Gebläseradscheibe im Bereich der Scheibenanbindungsflächen stark oder unstetig gekrümmt ist. Der Verlauf des Einpressabschnitts wird über den Verformungsabschnitt so angepasst, dass die Anbindungsflächen entlang der einen Schaufelanbindungsebene für die Stirnkanten der Gebläseradschaufeln unabhängig von der Erstreckung des benachbarten Scheibenflächenkörpers verlaufen.In one exemplary embodiment, the press-in section has a deformation section that is plastically deformed in the axial direction and protrudes axially relative to a disk surface and extends along the connection plane. This means that the plastic deformation of the impeller disk to produce the blade connection surfaces is so great that the deformation sections protrude on an axial side of the impeller disk which is opposite to the side on which the impeller blades are arranged. The formation of a protruding deformation section expands the geometric adaptability of the blade connection surfaces of the impeller disk, so that an extension within one connection plane can be realized, even if the curvature of the disk body of the impeller disk is sharply or discontinuously curved in the area of the disk connection surfaces. The course of the press-in section is adjusted via the deformation section in such a way that the connection surfaces run along the one blade connection plane for the end edges of the impeller blades independently of the extent of the adjacent disk surface body.

Die Form des axial vorstehenden und somit die Strömung unmittelbar beeinflussenden Verformungsabschnitts ist ebenfalls anpassbar. So wird in einer Ausführung vorgesehen, dass der Verformungsabschnitt in Umfangsrichtung gesehen einen Einlaufabschnitt für die Strömung aufweist, der eine abgerundete Anströmkante bildet.The shape of the axially projecting deformation section, which thus directly influences the flow, can also be adjusted. In one embodiment, it is provided that the deformation section has an inlet section for the flow, seen in the circumferential direction, which forms a rounded leading edge.

In einer Weiterbildung weist der Verformungsabschnitt entlang seiner Erstreckung in Umfangsrichtung eine variable Breite auf. Insbesondere ist eine Ausführung vorteilhaft, bei welcher der Verformungsabschnitt in einer axialen Draufsicht eine im Wesentlichen ovale Form oder eine Querschnittsform eines Tragflächenprofils aufweist. Letztere ist auch ein Beispiel der ebenfalls umfassten Ausführungsvariante, bei der sich die Breite des Verformungsabschnitts entlang seiner Erstreckung in Umfangsrichtung in einem Auslaufabschnitt strömungstechnisch günstig verringert.In a development, the deformation section has a variable width along its extent in the circumferential direction. In particular, an embodiment is advantageous in which the deformation section has a substantially oval shape or a cross-sectional shape of an airfoil profile in an axial plan view. The latter is also an example of likewise included embodiment variant, in which the width of the deformation section along its extension in the circumferential direction in an outlet section is reduced in a fluidically favorable manner.

Die erfindungsgemäße Gebläseradscheibe ist grundsätzlich als Bodenscheibe oder Deckscheibe eines Gebläserads einsetzbar, wobei die Bodenscheiben zumeist einen großflächig horizontal ebenen Abschnitt aufweisen, in dem keine problematische räumlich gekrümmte Geometrie vorliegt. Die Deckscheiben sind jedoch häufig von radial innen nach radial außen stark gekrümmt. Eine derartige Krümmung liegt bei einer trichterförmig zur Rotationsachse zulaufenden Gebläseradscheibe vor, die ein Ausführungsbeispiel der Erfindung darstellt.The fan wheel disk according to the invention can basically be used as a base disk or cover disk of a fan wheel, with the base disks usually having a large, horizontally flat section in which there is no problematic spatially curved geometry. However, the cover disks are often strongly curved from radially inside to radially outside. Such a curvature is present in a fan wheel disk tapering in a funnel shape towards the axis of rotation, which represents an exemplary embodiment of the invention.

Teil der Erfindung ist ein mehrteilig ausgebildetes Gebläserad, das zumindest eine Gebläseradscheibe umfasst.Part of the invention is a multi-part impeller that includes at least one impeller disk.

Das Gebläserad umfasst üblicherweise eine Vielzahl, jedoch mindestens eine Gebläseradschaufel mit einer ersten und zweiten axialen Stirnkante. In einer vorteilhaften Lösung wird vorgesehen, dass eine der axialen Stirnkanten eine zu dem Einpressabschnitt der Gebläseradscheibe korrespondierende Form aufweist. Auch ist eine entsprechende Formgebung generell sowohl an einer Deck- und Bodenscheibe vorsehbar, bei der Einpressabschnitte an entsprechend beiden Scheiben und Stirnkanten der Gebläseradschaufeln ausgebildet sind. Die Erfindung findet dann Anwendung sowohl an der Deckscheibe als auch an der Bodenscheibe. Auch die Ablängung der Gebläseradschaufeln erfolgt in einem solchen Fall an beiden axialen Stirnkanten in jeweils einer Ebene.The impeller typically includes a plurality, but at least one, impeller blades having first and second axial facing edges. In an advantageous solution, it is provided that one of the axial front edges has a shape that corresponds to the press-in section of the impeller disk. A corresponding shape can also generally be provided on both a cover disk and a base disk, in which press-in sections are formed on the corresponding disks and front edges of the impeller blades. The invention is then used both on the cover pane and on the bottom pane. In such a case, the impeller blades are also cut to length on both axial end edges in one plane each.

Bei dem Gebläserad wird erfindungsgemäß vorgesehen, dass zumindest eine der axialen Stirnkanten der mindestens einen Gebläseradschaufel vollständig entlang der Anbindungsebene verläuft. Hierdurch wird gewährleistet, dass die Stirnkante zur Schaufelanbindungsfläche an der Gebläseradschaufel passt und flächig daran anliegt. Die Gebläseradschaufeln sind mithin entlang ihrer Stirnkante so beschnitten bzw. abgelängt, dass sie geometrisch an die jeweilige Schaufelanbindungsfläche der Gebläseradscheibe angepasst sind und die Stirnkantenfläche und Schaufelanbindungsfläche in derselben Ebene verlaufen.In the case of the impeller, it is provided according to the invention that at least one of the axial front edges of the at least one impeller blade runs completely along the connection plane. This ensures that the front edge faces the blade connection surface on the impeller blade fits and lies flat against it. The impeller blades are therefore trimmed or cut to length along their front edge in such a way that they are geometrically adapted to the respective blade connection surface of the impeller disk and the front edge surface and blade connection surface run in the same plane.

In einer Weiterbildung verläuft die der Gebläseradscheibe zuweisende Stirnkante der mindestens einen Gebläseradschaufel vollständig innerhalb des Einpressabschnitts der Gebläseradscheibe und liegt axialseitig an der Schaufelanbindungsfläche an. Die Schaufelanbindungsfläche wird dabei durch die axiale Bodenfläche des Einpressabschnitts bestimmt. Über die axiale Tiefe des Einpressabschnitts und dessen diesbezüglichen Verlauf ist ebenfalls eine geometrische Anpassung der Schaufelanbindungsfläche an die Stirnkante der Gebläseradschaufel in eine und dieselbe Ebene möglich.In a further development, the end edge of the at least one fan wheel blade facing the fan wheel disk runs completely within the press-in section of the fan wheel disk and rests on the blade connection surface on the axial side. The blade connection area is determined by the axial bottom area of the press-in section. A geometric adaptation of the blade connection surface to the front edge of the impeller blade in one and the same plane is also possible via the axial depth of the press-in section and its course in this regard.

In einer Weiterbildung ist ferner vorgesehen, dass die axiale Stirnkante der mindestens einen Gebläseradschaufel in einer axialen Draufsicht gekrümmt ausgebildet ist. In sich gekrümmte Gebläseradschaufeln sind unproblematisch umsetzbar, da deren Stirnkanten nicht nur entlang einer Linie, sondern entlang einer festgelegten Ebene beschnitten werden. Die Formgebung der Anbindungsflächen, Einpressabschnitte und/oder Verformungsabschnitte weisen dann vorzugsweise eine entsprechend gekrümmte Form auf.In a development, it is also provided that the axial end edge of the at least one impeller blade is curved in an axial plan view. Inherently curved impeller blades can be implemented without any problems, since their front edges are not only cut along a line, but along a defined plane. The shape of the connection surfaces, press-in sections and/or deformation sections then preferably have a correspondingly curved shape.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet bzw. werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführung der Erfindung anhand der Figuren näher dargestellt. Es zeigen:

Fig. 1
eine Ansicht von unten auf eine Gebläseradscheibe;
Fig. 2
eine Seitenansicht der Gebläseradscheibe aus Figur 1 ;
Fig. 3
eine Seitenansicht eines Gebläserads mit einer Gebläseradscheibe gemäß der Fig. 1 und 2.
Other advantageous developments of the invention are characterized in the dependent claims or are presented in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
1
a bottom view of an impeller disk;
2
Figure 1 shows a side view of the impeller disk figure 1 ;
3
a side view of an impeller with an impeller disk according to the Figures 1 and 2 .

Die Figuren zeigen beispielhaft eine Ausführungsform der Erfindung, wobei gleiche Bezugszeichen gleiche Teile in allen Ansichten benennen.The figures show an exemplary embodiment of the invention, with the same reference symbols denoting the same parts in all views.

In den Figuren 1 und 2 ist eine Gebläseradscheibe 1 ausgebildet als Deckscheibe in einer Ansicht von unten und einer Seitenansicht dargestellt. In dem um die Rotationsachse R liegenden Zentralbereich hat die Gebläseradscheibe 1 eine Strömungsöffnung 2. Der Scheibenkörper der Gebläseradscheibe 1 ist trichterförmig und weist einen die Trichterform bestimmenden sich von radial innen nach radial außen gekrümmt erstreckenden Bereich 3 auf. Der Scheibenkörper geht dabei von einer Erstreckung am radialen Umfangsrand 22, die im Wesentlichen einer Radialebene entspricht, in eine Erstreckung an der Strömungsöffnungskante 21 über, die im Wesentlichen einer Axialebene entspricht. In diesem gekrümmten Bereich 3 ist eine Vielzahl von in Umfangsrichtung beabstandeter Schaufelanbindungsflächen 4 ausgebildet, an denen axiale Stirnseiten von Gebläseradschaufeln befestigt werden, wie es in den Figuren 3 und 4 beispielhaft gezeigt ist. Jede der Schaufelanbindungsflächen 4 erstreckt sich über ihre jeweils gesamte Länge von radial innen nach radial außen entlang der festgelegten Anbindungsebene E.In the Figures 1 and 2 a fan wheel disc 1 designed as a cover disc is shown in a view from below and a side view. The impeller disk 1 has a flow opening 2 in the central area around the axis of rotation R. The disk body of the impeller disk 1 is funnel-shaped and has an area 3 that defines the funnel shape and extends in a curved manner from radially inward to radially outward. The disc body transitions from an extension at the radial peripheral edge 22, which essentially corresponds to a radial plane, to an extension at the flow opening edge 21, which essentially corresponds to an axial plane. In this curved region 3, a plurality of circumferentially spaced blade attachment surfaces 4 are formed, to which axial end faces of impeller blades are attached, as is shown in FIGS Figures 3 and 4 is shown by way of example. Each of the blade connection surfaces 4 extends over its entire length from radially inside to radially outside along the defined connection plane E.

Jede Schaufelanbindungsfläche 4 ist in einem in die Scheibenoberfläche 9 plastisch verformten Einpressabschnitt 6, jeweils auf der axialen Bodenfläche des jeweiligen Einpressabschnitts 6 ausgebildet. Die plastische Verformung der Einpressabschnitte 6 durchdringt den gesamten Scheibenkörper und bildet auf der axial gegenüberliegenden Seite der Scheibenoberfläche 9 jeweils einen axial vorstehenden Verformungsabschnitt 7, der sich jeweils entlang der Anbindungsebene E erstreckt, wie in Figur 2 zu erkennen ist. Die den Scheibenanbindungsflächen 4 axial gegenüberliegenden Außenflächen 14 verlaufen parallel zu den Scheibenanbindungsflächen 4. Durch die plastische Verformung bilden die Verformungsabschnitte 7 jeweils gegenüber dem Scheibenkörper axial vorstehende Seitenwände 5, deren Steigung und Form strömungstechnisch anpassbar ist. Die Scheibenanbindungsflächen 4 verlaufen in der gezeigten Ausführung von radial innen nach radial außen und in Umfangsrichtung über einen Winkel von über 30°. Die Einpressabschnitte 5 erstrecken sich von dem radialen Umfangsrand 22 bis zu einem radial innen liegenden Bereich der Gebläseradscheibe 1, in dem ihr Verlauf in eine ausschließliche Axialerstreckung übergeht. Die Scheibenanbindungsflächen 4 weisen in einer axialen Draufsicht jeweils die Form eines Tragflächenprofils mit einer maximalen Breite B auf, wobei sich die Scheibenanbindungsflächen 4 von der maximalen Breite B in beide Strömungsrichtungen verjüngen. Die Verformungsabschnitte 7 weisen hierzu jeweils einen Einlaufabschnitt 11 mit einer abgerundeten Anströmkante 13 und einen im Wesentlichen spitz zulaufenden Auslaufabschnitt 12 auf.Each blade connection surface 4 is formed in a press-fit section 6 that is plastically deformed into the disk surface 9 , in each case on the axial bottom surface of the respective press-fit section 6 . The plastic deformation of the press-in sections 6 penetrates the entire disc body and forms an axially protruding deformation section 7 on the axially opposite side of the disc surface 9, which extends along the connection plane E, as shown in FIG figure 2 can be seen. The disk connection surfaces 4 axially opposite outer surfaces 14 run parallel to the disk connection surfaces 4. Due to the plastic deformation, the deformation sections 7 each form opposite the Disc body axially projecting side walls 5, the slope and shape is fluidically adjustable. In the embodiment shown, the disk connection surfaces 4 run from radially inside to radially outside and in the circumferential direction over an angle of more than 30°. The press-in sections 5 extend from the radial peripheral edge 22 to a radially inner area of the impeller disk 1, in which their course changes into an exclusive axial extension. In an axial plan view, the disk connection surfaces 4 each have the shape of an airfoil profile with a maximum width B, with the disk connection surfaces 4 tapering from the maximum width B in both flow directions. For this purpose, the deformation sections 7 each have an inlet section 11 with a rounded leading edge 13 and an outlet section 12 tapering essentially to a point.

In Figur 3 ist ein Gebläserad 30 mit einer Gebläseradscheibe 1 gemäß der Figuren 1 und 2 in einer Seitenansicht dargestellt. Das Gebläserad 30 weist eine Vielzahl von in Umfangsrichtung beabstandeten Gebläseradschaufeln 16 auf, die mit ihrer jeweiligen unteren axialen Stirnkante an der Bodenscheibe 17 und mit ihrer jeweiligen oberen axialen Stirnkante an der als Deckscheibe ausgebildeten Gebläseradscheibe 1 befestigt sind. Die oberen axialen Stirnkanten erstrecken sich vollflächig anliegend an den Scheibenanbindungsflächen 4 innerhalb der Einpressabschnitte 6 und mithin entlang der Anbindungsebene E. Die Gebläseradschaufeln 16 durchdringen dabei mit ihren axialen Stinkanten den Scheibenkörper der Gebläseradscheibe 1 und werden von den Verformungsabschnitten 7 umschlossen. Die oberen Stirnkantenflächen der Gebläseradschaufeln 16 weisen eine zu den Scheibenanbindungsflächen 4 korrespondierende Form auf, so dass diesbezüglich auf die Form der Scheibenanbindungsflächen 4 in Figur 1 verwiesen wird. Dabei ist auch die in sich gekrümmte Form jeder der Gebläseradschaufeln 16 nachvollziehbar. Die Gebläseradschaufeln 1 sind gegenüber einem radialen Umfangsrand der Bodenscheibe 17 nach radial innen beabstandet. An der Gebläseradscheibe 1 verlaufen die Gebläseradschaufeln 16 wie die Scheibenanbindungsflächen 4 bis zu ihrem radialen Umfangsrand 22 und schlie-ßen im gezeigten Ausführungsbeispiel im Wesentlichen bündig ab.In figure 3 is an impeller 30 with an impeller disc 1 according to FIG Figures 1 and 2 shown in a side view. The impeller 30 has a plurality of impeller blades 16 spaced apart in the circumferential direction, which are fastened with their respective lower axial front edge to the bottom disk 17 and with their respective upper axial front edge to the impeller disk 1 designed as a cover disk. The upper axial end edges extend over the entire surface, bearing against the disc connection surfaces 4 within the press-in sections 6 and therefore along the connection plane E. The impeller blades 16 penetrate the disc body of the impeller disc 1 with their axial edges and are surrounded by the deformation sections 7. The upper front edge surfaces of the impeller blades 16 have a shape that corresponds to the disk connection surfaces 4, so that the shape of the disk connection surfaces 4 in figure 1 is referenced. The curved shape of each of the impeller blades 16 is also understandable. The impeller blades 1 are spaced radially inwards relative to a radial peripheral edge of the bottom disk 17 . At the Fan wheel disk 1, like the disk connection surfaces 4, the fan wheel blades 16 run up to their radial peripheral edge 22 and, in the exemplary embodiment shown, are essentially flush.

Claims (12)

  1. A fan wheel (30) comprising a fan wheel disc (1) and at least one fan wheel blade (16), said fan wheel disc (1) comprising at least one region which extends in a curved manner at least in sections from radially inside to radially outside, in which a blade attachment surface (4) is formed at least in sections, at which an axial end side of the at least one fan wheel blade (16)is fixedly connected, wherein the blade attachment surface (4) extends at least in some sections within the curved region of the fan wheel disc (1) within a two-dimensional connecting plane (E), wherein the axial end edge of the at least one fan wheel blade (16) extends entirely along the two-dimensional connecting plane (E), characterized in that the fan wheel disc (1) is plastically deformed along the at least one blade attachment surface (4) at least in some sections, and in that the at least one blade attachment surface (4) is formed in a press-in section (6) which is pressed by plastic deformation in an axial direction into the fan wheel disc (1).
  2. The fan wheel according to the claim 1, characterized in that the press-in section (6) comprises a deformation section (7) which is plastically deformed in axial direction and protrudes axially with respect to a disc surface (19) and which extends along the connecting plane (E).
  3. The fan wheel according to the preceding claim, characterized in that, viewed in circumferential direction, the deformation section (7) comprises an inlet section (11) which forms a rounded off leading edge (13).
  4. The fan wheel according to one of the two preceding claims, characterized in that the deformation section (7) has a variable width (B) along its extension in circumferential direction.
  5. The fan wheel (according to the preceding claim, characterized in that the width (B) of the deformation section (7) decreases along its extension in circumferential direction in an outlet section (12).
  6. The fan wheel according to any one of the preceding claims, characterized in that the fan wheel disc (1) is designed as bottom disc or cover disc of the fan wheel (30).
  7. A fan wheel (30) according to one of the preceding claims, characterized in that it is having a multi-part design.
  8. The fan wheel according claim 1, wherein the at least one fan wheel blade (1) comprises a first and a second axial end edge, wherein the first axial end edge has a shape corresponding to the press-in section (6) of the fan wheel disc (1).
  9. The fan wheel according to claim 1 or 8, characterized in that the first axial end edge of the at least one fan wheel blade (16) extends entirely within the press-in section (6) of the fan wheel disc (1) and is in contact with the blade attachment surface (4) on the axial side.
  10. The fan wheel according to claim 9, characterized in that the first axial end edge of the at least one fan wheel blade (16) is designed in a curved manner in an axial top view.
  11. The fan wheel according to any one of the preceding Claims 1 to 10, characterized in that the fan wheel disc (1) is designed in the shape of a funnel.
  12. The fan wheel according to any one of the preceding Claims 1 to 11 comprising moreover an additional fan wheel disc which is fastened to the second axial end edge of the at least one fan wheel blade (16).
EP17734033.8A 2016-06-28 2017-06-22 Fan wheel disc and fan wheel Active EP3475580B1 (en)

Applications Claiming Priority (2)

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DE102016111830.3A DE102016111830A1 (en) 2016-06-28 2016-06-28 Blower wheel and impeller
PCT/EP2017/065463 WO2018001872A1 (en) 2016-06-28 2017-06-22 Fan wheel disc and fan wheel

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EP3475580A1 EP3475580A1 (en) 2019-05-01
EP3475580B1 true EP3475580B1 (en) 2023-08-02

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US (1) US10920786B2 (en)
EP (1) EP3475580B1 (en)
CN (1) CN205876803U (en)
DE (1) DE102016111830A1 (en)
WO (1) WO2018001872A1 (en)

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DE102021119121A1 (en) * 2021-07-23 2023-01-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Radial or diagonal impeller with modified blade edge

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CN205876803U (en) 2017-01-11
US10920786B2 (en) 2021-02-16
US20190120245A1 (en) 2019-04-25
WO2018001872A1 (en) 2018-01-04
EP3475580A1 (en) 2019-05-01

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