EP3431775B1 - Fastening of a mounting strut for a protective fan guard - Google Patents

Fastening of a mounting strut for a protective fan guard Download PDF

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Publication number
EP3431775B1
EP3431775B1 EP18184048.9A EP18184048A EP3431775B1 EP 3431775 B1 EP3431775 B1 EP 3431775B1 EP 18184048 A EP18184048 A EP 18184048A EP 3431775 B1 EP3431775 B1 EP 3431775B1
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EP
European Patent Office
Prior art keywords
leg
fastening
fan guard
set forth
protective fan
Prior art date
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EP18184048.9A
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German (de)
French (fr)
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EP3431775A1 (en
Inventor
Michael Eccarius
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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 EP3431775A1 publication Critical patent/EP3431775A1/en
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    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • 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
    • F05D2260/00—Function
    • F05D2260/30—Retaining components in desired mutual position
    • F05D2260/31—Retaining bolts or nuts

Definitions

  • the invention relates to a fastening device of a fastening strut for a fan protection grille and a fan protection grille with at least one fastening strut and such a fastening device.
  • Fan protection grilles are used, for example, in axial fans as protection against contact. They usually include a large number of concentric bars spaced apart in the radial direction. In addition, the fan guards are often designed three-dimensionally, with their radial edge section being formed by mainly axially spaced grid bars. Grid bars spaced radially and axially from one another can also be provided in order to form oblique courses.
  • the grille bars of the fan guards are fastened and stabilized in a fixed position with one another by fastening struts that run radially over the grille bars.
  • the fan protection grilles are attached to the fan or the fan motor via the ends of the fastening struts.
  • the invention is based on the object of improving the fastening of a protective grille and/or increasing the fatigue strength properties of the fastening elements required for this purpose.
  • a fan protection grille with at least one fastening strut and at least one fastening device for fastening the fastening strut of the fan protection grille which has at least one first leg extending in a longitudinal direction and which is designed to engage over a plurality of bars of the fan protection grille, the at least one first leg being a has a free longitudinal end, and the fastening device is arranged in the area of the free longitudinal end of the at least first leg.
  • the fastening device includes a first fastening sleeve and at least one second fastening sleeve, which cooperate in such a way that at least one clamping area receiving at least the first leg is supported.
  • the clamping area is bordered by at least a first collar provided on one of the fastening sleeves.
  • an exemplary embodiment of the fastening device is characterized in that the at least two fastening sleeves can be braced axially both against each other and against the leg for fixing the protective grille.
  • the at least two fastening sleeves can be clamped by a screw connection.
  • At least one of the fastening sleeves has a conical section directed in the axial direction, so that when the fastening sleeves are braced relative to one another as a result of the axial movement, a normal force Fn acts on the at least one leg.
  • a normal force Fn and an axial force Fax act on the at least one leg.
  • the clamping area is undersized compared to the leg, so that a clamping connection is formed in the fastened state.
  • a clamping force Fsp for bracing and/or clamping is realized in the clamping area by the first fastening sleeve and the at least one second fastening sleeve by means of a screw connection.
  • the fastening device is also aimed at designs in which the fastening strut has a second leg extending in the longitudinal direction essentially parallel to the first leg. Both legs are arranged in the clamping area and are held by the fastening device.
  • the fastening strut has a second leg extending in the longitudinal direction essentially parallel to the first leg, the first and second legs being formed in one piece in a hairpin shape and an open end of the hairpin shape determining the free longitudinal end.
  • the “hairpin shape” is defined as a U-shape comprising two at least essentially parallel legs, which is closed on one side by a substantially round transition, so that a U-shape is created, the respective leg length and curvature of the transition being variable.
  • the fastening device is preferably arranged between the first and second legs, viewed in the transverse direction.
  • the free longitudinal end of the fastening strut is due to the arrangement of the fastening device between stabilized on the two legs, enables a higher moment absorption at the attachment point of the fan protection grille and ensures an increased service life in operation.
  • first and/or the second leg have a substantially round cross-sectional shape.
  • the fastening element is arranged so that it is flush with the free longitudinal end of the leg or legs.
  • the invention further comprises a fan guard with at least one, preferably a plurality, of fastening struts described above and a corresponding number of fastening devices on each of the fastening struts.
  • a fan protection grille has several bars which are overlapped by the at least one fastening strut.
  • the free longitudinal end of the fastening strut and the fastening element arranged thereon protrude radially inwards relative to the area of the lattice bars and provide a connection point to the fan or fan motor.
  • FIG 1 is a fan protection grille 50 with a large number of circumferential bars 3 shown in a perspective view.
  • the fan protection grille 50 has four fastening struts 31 for mounting on a fan, between which shorter single-leg stiffening struts 30 are arranged, viewed in the radial direction.
  • the fastening struts 1 extend over all the bars 3 and each have the free longitudinal end at their radially inner sections.
  • Each of the fastening struts 31 is formed by two legs 11, 12 which run in a hairpin shape.
  • the closed U-shaped section protrudes radially beyond the fan protection grille 50 and each offers a connection point.
  • the shape of the fastening struts 31 is adapted to the course of the lattice bars 3, so that the fastening struts 1 have an outer, essentially vertical section, an adjoining radially extending section, and an adjoining oblique section.
  • the free longitudinal section adjoins the oblique section, in which the fastening struts 31 run straight in the radial direction.
  • the fastening device 13 is provided, which is also in the Figures 2 and 3 is shown in more detail.
  • Each fastening device 13 comprises according to Figure 2 and 3 two interlocking fastening sleeves 14, 15, which together form the clamping area 19, within which the leg ends of the legs 11, 12 are inserted.
  • Both fastening sleeves 14, 15 each have a collar 24, 25 which completely overlaps the legs 11, 12 and axially borders the clamping area 19.
  • a clamping force also acts on the two legs 11, 12, which increases due to the conical sections 56 as the two fastening sleeves 14, 15 get closer.
  • the fan protection grille 50 can also be tensioned. In the embodiment shown, this is done via a screw, not shown, which is guided through the screw hole 17 and can move the two fastening sleeves 14, 15 towards one another in the axial direction.
  • the clamping area 19 is undersized in the axial direction compared to the legs 11, 12, so that in the fastened state a clamping connection according to Fig. 2 is formed.
  • the fastening sleeves 14, 15 When clamped to one another, the fastening sleeves 14, 15 generate such an axial clamping force Fsp in the clamping area 19, which is sufficient so that both the required clamping forces of the clamping area 19 and the transverse forces that can be absorbed (perpendicular to the axial clamping force) are above the actually occurring transverse forces Fq.
  • transverse forces are absorbed by the collar 24 of the fastening sleeve 14.
  • the fastening device 13 is flush with the free longitudinal end of the legs 11, 12, which are round in cross section.

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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 eine Befestigungsvorrichtung einer Befestigungsstrebe für ein Lüfterschutzgitter sowie ein Lüfterschutzgitter mit wenigstens einer Befestigungsstrebe und einer derartigen Befestigungsvorrichtung.The invention relates to a fastening device of a fastening strut for a fan protection grille and a fan protection grille with at least one fastening strut and such a fastening device.

Lüfterschutzgitter werden beispielsweise bei Axiallüftern als Berührschutz eingesetzt. Sie umfassen üblicherweise eine Vielzahl von konzentrischen in radialer Richtung beabstandeten Gitterstäben. Zudem sind die Lüfterschutzgitter häufig dreidimensional ausgebildet, wobei ihr radialer Randabschnitt durch hauptsächlich axial beabstandete Gitterstäbe gebildet ist. Auch zueinander radial und axial beabstandete Gitterstäbe können vorgesehen sein, um schräge Verläufe auszubilden.Fan protection grilles are used, for example, in axial fans as protection against contact. They usually include a large number of concentric bars spaced apart in the radial direction. In addition, the fan guards are often designed three-dimensionally, with their radial edge section being formed by mainly axially spaced grid bars. Grid bars spaced radially and axially from one another can also be provided in order to form oblique courses.

Durch radial über die Gitterstäbe verlaufende Befestigungsstreben werden die Gitterstäbe der Lüfterschutzgitter miteinander positionsfest befestigt und stabilisiert. Zudem werden die Lüfterschutzgitter über die Enden der Befestigungsstreben an dem Lüfter bzw. dem Lüftermotor befestigt. Diese Anbindungsstellen sind hohen Belastungen ausgesetzt, da zum einen die durch den Betrieb des Lüftermotors erzeugten Biege- und Rotationsmomente, zum anderen im Betrieb erzeugte Schwingungen aufgenommen werden müssen. Die Anbindungsstelle der Befestigungsstrebe muss deshalb äußerst stabil ausgebildet sein, um Brüche der Strebe oder der Befestigungsmittel zu verhindern. Entsprechende Anforderungen werden generell auch an die Befestigungslösung der Streben gestellt.The grille bars of the fan guards are fastened and stabilized in a fixed position with one another by fastening struts that run radially over the grille bars. In addition, the fan protection grilles are attached to the fan or the fan motor via the ends of the fastening struts. These connection points are exposed to high loads because, on the one hand, the Bending and rotational moments generated by the operation of the fan motor, and vibrations generated during operation must be absorbed. The connection point of the fastening strut must therefore be extremely stable in order to prevent breakage of the strut or the fastening means. Corresponding requirements are generally also placed on the fastening solution for the struts.

Stand der Technik zu derartigen Befestigungsstreben und Lüfterschutzgittern ist beispielsweise in der DE 20 2016 103 323 U1 , DE 299 00 923 U1 , der DE 10 2015 004 019 A1 oder der DE 33 11 660 C2 offenbart.The state of the art for such fastening struts and fan guards is, for example, in DE 20 2016 103 323 U1 , DE 299 00 923 U1 , the DE 10 2015 004 019 A1 or the DE 33 11 660 C2 disclosed.

Nachteilig an bekannten Lösungen ist insbesondere die nicht immer ausreichende Vermeidung von Querkraftbelastungen und die häufig einteilig oder stoffschlüssig realisierten Befestigungsmittel am oder in Schutzgitterelementen wie beispielsweise Tragstreben.The disadvantage of known solutions is, in particular, the insufficient avoidance of transverse force loads and the fastening means, which are often implemented in one piece or in a cohesive manner, on or in protective grid elements such as support struts.

Der Erfindung liegt die Aufgabe der Verbesserung der Befestigung eines Schutzgitters und/oder die Steigerung der Dauerfestigkeitseigenschaften der dazu erforderlichen Befestigungselemente zu Grunde.The invention is based on the object of improving the fastening of a protective grille and/or increasing the fatigue strength properties of the fastening elements required for this purpose.

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

Erfindungsgemäß wird ein Lüfterschutzgitter mit mindestens einer Befestigungsstrebe und mindestens einer Befestigungsvorrichtung zur Befestigung der Befestigungsstrebe des Lüfterschutzgitter vorgeschlagen, das zumindest einen sich in einer Längsrichtung erstreckenden ersten Schenkel aufweist, der ausgebildet ist, mehrere Gitterstäbe des Lüfterschutzgitters zu übergreifen, wobei der zumindest eine erste Schenkel ein freies Längsende aufweist, und im Bereich des freien Längsendes des zumindest ersten Schenkels die Befestigungsvorrichtung angeordnet ist. Die Befestigungsvorrichtung umfasst eine erste Befestigungshülse und wenigstens eine zweite Befestigungshülse, die derart zusammenwirken, dass wenigstens ein zumindest den ersten Schenkel aufnehmender Klemmbereich unterstützt ist.According to the invention, a fan protection grille with at least one fastening strut and at least one fastening device for fastening the fastening strut of the fan protection grille is proposed, which has at least one first leg extending in a longitudinal direction and which is designed to engage over a plurality of bars of the fan protection grille, the at least one first leg being a has a free longitudinal end, and the fastening device is arranged in the area of the free longitudinal end of the at least first leg. The fastening device includes a first fastening sleeve and at least one second fastening sleeve, which cooperate in such a way that at least one clamping area receiving at least the first leg is supported.

In einer Ausführung der Befestigungsvorrichtung ist vorgesehen, dass der Klemmbereich durch wenigstens einen ersten an einer der Befestigungshülsen vorgesehenen Bund berandet ist.In one embodiment of the fastening device it is provided that the clamping area is bordered by at least a first collar provided on one of the fastening sleeves.

Ferner ist ein Ausführungsbeispiel der Befestigungsvorrichtung dadurch gekennzeichnet, dass die wenigstens zwei Befestigungshülsen axial sowohl gegeneinander als auch gegenüber dem Schenkel zur Festlegung des Schutzgitters verspannbar sind.Furthermore, an exemplary embodiment of the fastening device is characterized in that the at least two fastening sleeves can be braced axially both against each other and against the leg for fixing the protective grille.

Vorzugsweise wird bei der Befestigungsvorrichtung vorgesehen, dass die wenigstens zwei Befestigungshülsen durch eine Verschraubung verspannbar sind.It is preferably provided in the fastening device that the at least two fastening sleeves can be clamped by a screw connection.

Erfindungsgemäß weist bei der Befestigungsvorrichtung wenigstens eine der Befestigungshülsen einen in Axialrichtung gerichteten konischen Abschnitt auf, so dass beim Verspannen der Befestigungshülsen zueinander infolge der Axialbewegung eine Normalkraft Fn auf den wenigstens einen Schenkel wirkt.According to the invention, in the fastening device, at least one of the fastening sleeves has a conical section directed in the axial direction, so that when the fastening sleeves are braced relative to one another as a result of the axial movement, a normal force Fn acts on the at least one leg.

Ferner ist als Ausführung umfasst, dass im Klemmzustand nach der Festlegung durch wenigstens eine Schulter des Bundes und wenigstens eines konischen Bereiches im Klemmbereich zur Aufnahme des wenigstens einen Schenkels eine Normalkraft Fn und eine Axialkraft Fax auf den wenigstens einen Schenkel einwirken.Furthermore, it is included as an embodiment that in the clamping state, after being fixed by at least one shoulder of the collar and at least one conical area in the clamping area for receiving the at least one leg, a normal force Fn and an axial force Fax act on the at least one leg.

Bei der Befestigungsvorrichtung ist der Klemmbereich gegenüber dem Schenkel untermaßig dimensioniert, sodass im befestigten Zustand eine Klemmverbindung gebildet ist.In the fastening device, the clamping area is undersized compared to the leg, so that a clamping connection is formed in the fastened state.

In einer vorteilhaften Weiterbildung ist vorgesehen, dass im Klemmbereich durch die erste Befestigungshülse und die wenigstens eine zweite Befestigungshülse eine Spannkraft Fsp zur Verspannung und/oder Klemmung durch eine Schraubenverbindung realisiert ist.In an advantageous development, it is provided that a clamping force Fsp for bracing and/or clamping is realized in the clamping area by the first fastening sleeve and the at least one second fastening sleeve by means of a screw connection.

Die Spannkraft wird vorzugsweise derart gewählt, dass sowohl die erforderlichen Klemmkräfte des Klemmbereiches als auch die aufnehmbaren Querkräfte über den real auftretenden Querkräften Fq liegen, wobei die Querkräfte gebildet werden durch Fq= µ * Fsp (µ entspricht der Reibungszahl zwischen den verklemmten aneinander anliegenden Bauteilen, welche die Querkraft aufnehmen).The clamping force is preferably selected in such a way that both the required clamping forces of the clamping area and the transverse forces that can be absorbed are above the actually occurring transverse forces Fq, whereby the transverse forces are formed by Fq = µ * Fsp (µ corresponds to the coefficient of friction between the clamped, adjacent components, which absorb the shear force).

Die Befestigungsvorrichtung ist auch auf Ausführungen gerichtet, bei denen die Befestigungsstrebe einen sich in Längsrichtung im Wesentlichen parallel zu dem ersten Schenkel erstreckenden zweiten Schenkel aufweist. Beide Schenkel sind im Klemmbereich angeordnet und werden von der Befestigungsvorrichtung gehalten.The fastening device is also aimed at designs in which the fastening strut has a second leg extending in the longitudinal direction essentially parallel to the first leg. Both legs are arranged in the clamping area and are held by the fastening device.

In einer Weiterbildung ist vorgesehen, dass die Befestigungsstrebe einen sich in Längsrichtung im Wesentlichen parallel zu dem ersten Schenkel erstreckenden zweiten Schenkel aufweist, wobei der erste und der zweite Schenkel einteilig in einer Haarnadelform ausgebildet sind und ein offenes Ende der Haarnadelform das freie Längsende bestimmt. Die "Haarnadelform" ist definiert als zwei zumindest im Wesentlichen parallele Schenkel umfassende U-Form, die einseitig durch einen im Wesentlichen runden Übergang geschlossen ist, so dass eine U-Form entsteht, wobei die jeweilige Schenkellänge und Krümmung des Übergangs variabel sind. Dabei wird vorzugsweise die Befestigungsvorrichtung in der Querrichtung gesehen zwischen dem ersten und zweiten Schenkel angeordnet. Das freie Längsende der Befestigungsstrebe ist durch die Anordnung der Befestigungsvorrichtung zwischen den beiden Schenkeln stabilisiert, ermöglicht eine höhere Momentaufnahme am Befestigungspunkt des Lüfterschutzgitters und gewährleistet eine gesteigerte Lebensdauer im Betrieb.In a further development it is provided that the fastening strut has a second leg extending in the longitudinal direction essentially parallel to the first leg, the first and second legs being formed in one piece in a hairpin shape and an open end of the hairpin shape determining the free longitudinal end. The “hairpin shape” is defined as a U-shape comprising two at least essentially parallel legs, which is closed on one side by a substantially round transition, so that a U-shape is created, the respective leg length and curvature of the transition being variable. The fastening device is preferably arranged between the first and second legs, viewed in the transverse direction. The free longitudinal end of the fastening strut is due to the arrangement of the fastening device between stabilized on the two legs, enables a higher moment absorption at the attachment point of the fan protection grille and ensures an increased service life in operation.

Als vorteilhafte Variante kann ferner vorgesehen werden, dass der erste und/oder der zweite Schenkel eine im Wesentlichen runde Querschnittsform aufweisen.As an advantageous variant, it can also be provided that the first and/or the second leg have a substantially round cross-sectional shape.

Im Bereich des freien Längsendes der Befestigungsstrebe wird das Befestigungselement so angeordnet, dass es bündig mit dem freien Längsende des bzw. der Schenkel abschließt.In the area of the free longitudinal end of the fastening strut, the fastening element is arranged so that it is flush with the free longitudinal end of the leg or legs.

Die Erfindung umfasst ferner ein Lüfterschutzgitter mit wenigstens einer, vorzugsweise einer Vielzahl von vorstehend beschriebenen Befestigungsstreben und einer entsprechenden Anzahl an Befestigungsvorrichtungen an jeder der Befestigungsstreben. Ein derartiges Lüfterschutzgitter weist mehrere Gitterstäbe auf, die von der wenigstens einen Befestigungsstrebe übergriffen sind. Das freie Längsende der Befestigungsstrebe und das daran angeordnete Befestigungselement stehen gegenüber dem Bereich der Gitterstäbe nach radial innen hervor und bieten einen Anbindungspunkt an den Lüfter oder Lüftermotor.The invention further comprises a fan guard with at least one, preferably a plurality, of fastening struts described above and a corresponding number of fastening devices on each of the fastening struts. Such a fan protection grille has several bars which are overlapped by the at least one fastening strut. The free longitudinal end of the fastening strut and the fastening element arranged thereon protrude radially inwards relative to the area of the lattice bars and provide a connection point to the fan or fan motor.

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
ein Lüfterschutzgitter in einer perspektivischen Ansicht mit Befestigungsstreben und Befestigungsvorrichtungen;
Fig. 2
eine Befestigungsvorrichtung am freien Ende einer der Befestigungsstreben in vergrößerter Detailansicht;
Fig. 3
eine Schnittansicht durch die Befestigungsvorrichtung.
Other advantageous developments of the invention are characterized in the subclaims or are shown in more detail below together with the description of the preferred embodiment of the invention with reference to the figures. Show it:
Fig. 1
a fan guard in a perspective view with fastening struts and fastening devices;
Fig. 2
a fastening device at the free end of one of the fastening struts in an enlarged detailed view;
Fig. 3
a sectional view through the fastening device.

Gleiche Bezugszeichen benennen gleiche Teile in allen Ansichten.Like reference numerals designate like parts throughout all views.

In Figur 1 ist ein Lüfterschutzgitter 50 mit einer Vielzahl von umlaufenden Gitterstäben 3 in einer perspektivischen Ansicht dargestellt. In Umfangsrichtung verteilt weist das Lüfterschutzgitter 50 zur Montage an einem Lüfter vier Befestigungsstreben 31 auf, zwischen denen jeweils in radialer Richtung gesehen kürzere einschenklige Versteifungsstreben 30 angeordnet sind. Die Befestigungsstreben 1 übergreifen alle Gitterstäbe 3 und weisen an ihren radial innen liegenden Abschnitten jeweils das freie Längsende auf. Jede der Befestigungsstreben 31 ist durch zwei Schenkel 11, 12 gebildet, die in einer Haarnadelform verlaufen. Im radial außen liegenden Bereich der Befestigungsstreben 31 steht der jeweils geschlossene U-förmige Abschnitt radial über das Lüfterschutzgitter 50 hervor und bietet jeweils eine Anbindungsstelle. Die Form der Befestigungsstreben 31 ist an den Verlauf der Gitterstäbe 3 angepasst, so dass die Befestigungsstreben 1 einen äußeren im Wesentlichen vertikal verlaufenden, einen sich daran anschließenden radial verlaufenden, einen sich daran anschließenden schrägen Abschnitt aufweisen. An den schrägen Abschnitt schließt sich der freie Längsabschnitt an, in dem die Befestigungsstreben 31 gerade in radialer Richtung verlaufen. In diesem Abschnitt ist jeweils die Befestigungsvorrichtung 13 vorgesehen, die auch in den Figuren 2 und 3 näher gezeigt ist.In Figure 1 is a fan protection grille 50 with a large number of circumferential bars 3 shown in a perspective view. Distributed in the circumferential direction, the fan protection grille 50 has four fastening struts 31 for mounting on a fan, between which shorter single-leg stiffening struts 30 are arranged, viewed in the radial direction. The fastening struts 1 extend over all the bars 3 and each have the free longitudinal end at their radially inner sections. Each of the fastening struts 31 is formed by two legs 11, 12 which run in a hairpin shape. In the radially outer area of the fastening struts 31, the closed U-shaped section protrudes radially beyond the fan protection grille 50 and each offers a connection point. The shape of the fastening struts 31 is adapted to the course of the lattice bars 3, so that the fastening struts 1 have an outer, essentially vertical section, an adjoining radially extending section, and an adjoining oblique section. The free longitudinal section adjoins the oblique section, in which the fastening struts 31 run straight in the radial direction. In this section, the fastening device 13 is provided, which is also in the Figures 2 and 3 is shown in more detail.

Jede Befestigungsvorrichtung 13 umfasst gemäß Figur 2 und 3 zwei ineinander greifende Befestigungshülsen 14, 15, die miteinander den Klemmbereich 19 bilden, innerhalb dem die Schenkelenden der Schenkel 11, 12 eingeschoben sind. An der ersten Befestigungshülse 14 ist ein senkrechter Axialsteg 16, an der zweiten Befestigungshülse 15 ein in Axialrichtung gerichteter konischer Abschnitt 56 in Form eines seitlichen Anlageschenkels für die Schenkel 11, 12 ausgebildet. Beide Befestigungshülsen 14, 15 weisen jeweils einen die Schenkel 11, 12 vollständig übergreifenden Bund 24, 25 auf, welche den Klemmbereich 19 axial beranden. Beim Verspannen der Befestigungshülsen 14, 15 zueinander wirkt infolge der Axialbewegung eine Normalkraft auf die beiden Schenkel 11, 12. Zudem wirkt im Klemmzustand nach der Festlegung durch die Schultern des jeweiligen Bundes 24 und der konischen Abschnitte 56 im Klemmbereich 19 eine auch eine Klemmkraft auf die beiden Schenkel 11, 12 ein, die aufgrund der konischen Abschnitte 56 mit zunehmender Annäherung der beiden Befestigungshülsen 14, 15 ansteigt. Durch Verspannung der beiden Befestigungshülsen 14, 15 in axialer Richtung kann auch das Lüfterschutzgitter 50 verspannt werden. In der gezeigten Ausführung erfolgt dies über eine nicht dargestellte Schraube, die durch das Verschraubungsloch 17 geführt wird und die beiden Befestigungshülsen 14, 15 in axialer Richtung aufeinander zu bewegen kann. Der Klemmbereich 19 ist in axialer Richtung gesehen gegenüber den Schenkeln 11, 12 untermaßig dimensioniert, sodass im befestigten Zustand eine Klemmverbindung gemäß Fig. 2 gebildet ist. Die Befestigungshülsen 14, 15 erzeugen im zueinander verspannten Zustand im Klemmbereich 19 eine derartige axiale Spannkraft Fsp, die ausreicht, dass sowohl die erforderlichen Klemmkräfte des Klemmbereiches 19 als auch die aufnehmbaren Querkräfte (senkrecht zur axialen Spannkraft) über den real auftretenden Querkräften Fq liegen. Zudem werden Querkräfte von dem Bund 24 der Befestigungshülse 14 aufgenommen. Die Befestigungsvorrichtung 13 schließt bündig mit dem freien Längsende der im Querschnitt runden Schenkel 11, 12 ab.Each fastening device 13 comprises according to Figure 2 and 3 two interlocking fastening sleeves 14, 15, which together form the clamping area 19, within which the leg ends of the legs 11, 12 are inserted. On the first fastening sleeve 14 there is a vertical axial web 16, on the second fastening sleeve 15 there is an axially directed conical section 56 in the form of a lateral contact leg for the Legs 11, 12 are formed. Both fastening sleeves 14, 15 each have a collar 24, 25 which completely overlaps the legs 11, 12 and axially borders the clamping area 19. When clamping the fastening sleeves 14, 15 to one another, a normal force acts on the two legs 11, 12 as a result of the axial movement. In addition, in the clamping state, after being fixed by the shoulders of the respective collar 24 and the conical sections 56 in the clamping area 19, a clamping force also acts on the two legs 11, 12, which increases due to the conical sections 56 as the two fastening sleeves 14, 15 get closer. By tensioning the two fastening sleeves 14, 15 in the axial direction, the fan protection grille 50 can also be tensioned. In the embodiment shown, this is done via a screw, not shown, which is guided through the screw hole 17 and can move the two fastening sleeves 14, 15 towards one another in the axial direction. The clamping area 19 is undersized in the axial direction compared to the legs 11, 12, so that in the fastened state a clamping connection according to Fig. 2 is formed. When clamped to one another, the fastening sleeves 14, 15 generate such an axial clamping force Fsp in the clamping area 19, which is sufficient so that both the required clamping forces of the clamping area 19 and the transverse forces that can be absorbed (perpendicular to the axial clamping force) are above the actually occurring transverse forces Fq. In addition, transverse forces are absorbed by the collar 24 of the fastening sleeve 14. The fastening device 13 is flush with the free longitudinal end of the legs 11, 12, which are round in cross section.

Claims (13)

  1. A protective fan guard (50) with at least one mounting strut and at least one fastening device for fastening the mounting strut of the protective fan guard (50), having a first leg (11) that extends in a longitudinal direction and engages over a plurality of guard bars (3) of the protective fan guard (50), wherein the at least one first leg (11) has a free longitudinal end and the fastening device (13) is arranged in the vicinity of the free longitudinal end of the at least one leg (11), wherein the fastening device (13) comprises a first fastening sleeve (14) and at least one second fastening sleeve (15) which engage in one another and form a clamping region (19) which receives the at least one first leg (11) and within which the leg end of the at least one first leg (11) is inserted, wherein a vertical axial web (16) is embodied on the first fastening sleeve (14) and a conical portion (56) which is oriented in the axial direction is embodied on the second fastening sleeve (15) in the form of a lateral contact leg for the leg (11), and wherein the protective fan guard (50) is braced through bracing of the two fastening sleeves (14, 15).
  2. The protective fan guard as set forth in claim 1, characterized in that the clamping region (19) is bordered by at least one first collar (24) that is provided on one of the fastening sleeves.
  3. The protective fan guard as set forth in at least one of the preceding claims, characterized in that the at least two fastening sleeves (14, 15) can be braced axially relative both to one another and to the leg (11) in order to secure the protective fan guard.
  4. The protective fan guard as set forth in the preceding claim, characterized in that the at least two fastening sleeves (14, 15) can be braced by means of a screw connection.
  5. The protective fan guard as set forth in the preceding claim, characterized in that, upon bracing of the fastening sleeves (14, 15) to one another, a normal force Fn acts on the at least one leg (11) as a result of the axial movement.
  6. The protective fan guard as set forth in at least one of preceding claims 2 to 5, characterized in that, in the clamping state after securement by means of at least one shoulder of the collar (24) and of at least one conical region in the clamping region (19), a normal force Fn and an axial force Fax act upon the at least one leg (11) for the purpose of receiving the at least one leg (11).
  7. The protective fan guard as set forth in at least one of the preceding claims. characterized in that the clamping region (19) is undersized relative to the leg (11), so that a clamp connection is formed in the fastened state.
  8. The protective fan guard as set forth in at least one of the preceding claims, characterized in that a clamping force Fsp for bracing and/or clamping is achieved in the clamping region (19) by the first fastening sleeve (14) and the at least one second fastening sleeve (15) by means of a screw connection.
  9. The protective fan guard as set forth in the preceding claim, characterized in that the clamping force is selected such that both the required clamping forces of the clamping region (19) and the supportable transverse forces are greater than the actually occurring transverse forces Fq, the transverse forces being constituted by Fq = µ * Fsp.
  10. The protective fan guard as set forth in the preceding claim, characterized in that the mounting strut has a second leg (12) which extends in the longitudinal direction substantially parallel to the first leg (11), and both legs (11, 12) are arranged in the clamping region.
  11. The protective fan guard as set forth in the preceding claim, characterized in that the first and second legs (11, 12) are integrally formed in a hairpin shape and an open end of the hairpin shape defines the free longitudinal end.
  12. The protective fan guard as set forth in any one of the preceding claims, characterized in that the first and/or the second leg (11, 12) have a substantially round cross-sectional shape.
  13. The protective fan guard as set forth in at least one of the preceding claims, characterized in that it ends flush with the free longitudinal end of the at least first leg (11).
EP18184048.9A 2017-07-19 2018-07-17 Fastening of a mounting strut for a protective fan guard Active EP3431775B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017116287.9A DE102017116287A1 (en) 2017-07-19 2017-07-19 Attachment of a fixing brace for a fan guard

Publications (2)

Publication Number Publication Date
EP3431775A1 EP3431775A1 (en) 2019-01-23
EP3431775B1 true EP3431775B1 (en) 2024-02-14

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Application Number Title Priority Date Filing Date
EP18184048.9A Active EP3431775B1 (en) 2017-07-19 2018-07-17 Fastening of a mounting strut for a protective fan guard

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EP (1) EP3431775B1 (en)
DE (1) DE102017116287A1 (en)

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601222A (en) * 1944-10-04 1948-04-30 Berkeley & Young Ltd Improvements in, or relating to, electric fans
DE3311660A1 (en) 1983-03-30 1984-10-04 Siemens AG, 1000 Berlin und 8000 München Axial fan
US5271588A (en) * 1992-07-17 1993-12-21 General Electric Company Multi-piece tube clamp
DE29900923U1 (en) 1999-01-20 2000-07-06 ebm Werke GmbH & Co., 74673 Mulfingen Arrangement for the vibration-isolating bracket of an electric motor
DE10111397B4 (en) * 2001-03-09 2010-04-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Protective grille for fans
WO2008037023A1 (en) * 2006-09-28 2008-04-03 Black Adda Pty Ltd Attachment clamp for a pair of elongate members
DE202009010930U1 (en) * 2009-08-14 2009-11-26 Tiemann Schutz-Systeme Gmbh Attachment for mesh fencing
DE102011121025A1 (en) * 2011-08-18 2013-02-21 Ziehl-Abegg Ag Motor suspension for fans, preferably axial fans, and method for producing a ventilation grille of such engine mount
DE102015004019A1 (en) * 2015-03-26 2016-09-29 Uwe Stadtmüller Guard; Method for producing a protective grille for fans
DE202016103323U1 (en) 2016-06-23 2016-07-06 Ebm-Papst Mulfingen Gmbh & Co. Kg Mounting strut for a fan guard

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EP3431775A1 (en) 2019-01-23
DE102017116287A1 (en) 2019-01-24

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