EP2410187B1 - Protective guard assembly for ventilator - Google Patents

Protective guard assembly for ventilator Download PDF

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Publication number
EP2410187B1
EP2410187B1 EP20110170176 EP11170176A EP2410187B1 EP 2410187 B1 EP2410187 B1 EP 2410187B1 EP 20110170176 EP20110170176 EP 20110170176 EP 11170176 A EP11170176 A EP 11170176A EP 2410187 B1 EP2410187 B1 EP 2410187B1
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EP
European Patent Office
Prior art keywords
locking
protective grille
protective
passage opening
arrangement according
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.)
Active
Application number
EP20110170176
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German (de)
French (fr)
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EP2410187A1 (en
Inventor
Thomas Heli
Alfred Korwin
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.)
Ebm Papst Mulfingen GmbH and Co KG
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Ebm Papst Mulfingen GmbH and Co KG
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Publication of EP2410187A1 publication Critical patent/EP2410187A1/en
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Publication of EP2410187B1 publication Critical patent/EP2410187B1/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
    • F04D29/70—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
    • F04D29/62—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
    • 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

Definitions

  • the present invention relates to a protective grid arrangement for a fan, consisting of a rotating fan vorrad or nachordnenden cover with an air passage opening and a closing in the region of the passage opening for contact protection with the cover over several distributed over the circumference arranged detent connections or connectable protective grid.
  • the publication DE 20 2008 002 356 U1 describes various embodiments of a compact fan with a protective grid arrangement of the generic type described above.
  • the known compact fan has as cover a front panel with an air inlet opening, which is covered with a protective grid to protect against contact with the rotating fan parts or can be covered.
  • the protective grid can be locked by means of a clip connection with the front panel.
  • the protective grid in a first embodiment on its outer edge axially projecting locking elements which can be latched with locking lugs of the front panel.
  • the guard meshes only slightly with the axially protruding latching elements in the opening area, so that the grid itself protrudes significantly above the opening plane.
  • the attachment is solely dependent on the spring elasticity of the axially projecting locking elements.
  • the protective grid in another embodiment may also be integrally formed with the front panel and then also lie approximately in the opening plane.
  • a very similar grid arrangement is in the document US 2004/0033131 A1 described, however, no locking lugs are provided in the passage opening of the cover. Instead, the self-elastically deformable latching elements (tabs) of the protective grille (fan grill), which engage here in the manner of tongues or lugs, engage under the inner opening edge of the passage opening, wherein support ribs are provided in the upper and outer opening regions of the passage opening widening like a nozzle are based on the opening edge.
  • the protective grid is thus held in that the opening edge of the passage opening sits axially between the latching elements and the abutment ribs of the protective grid.
  • Each locking element is located in the region of the outer, radial end of a radial strut, which extends radially inwardly to the middle part of the protective grid.
  • the protective grid is designed so as to be elastically deformable such that each latching element for latching and releasing the latching connection can be moved under zone-wise, elastic deformation of the protective grid radially relative to the inner edge of the passage opening.
  • the locking element is bent itself (paragraph 0027, "bending the tabs 30").
  • the present invention is based on the object to improve a protective grid arrangement of the type described so that a safe and in particular play-free snap-fastening of the protective grid is ensured in the passage opening of the cover without protrusion of the protective grid.
  • the protective grid should be easy and quick to install and in particular also be solvable.
  • the invention provides that the locking elements are arranged on the outer edge of the protective grid in the lattice plane only pointing radially outward, wherein the protective grid in the region of each latching element is designed elastically deformable such that each latching element for latching and releasing the latching connection under regionally elastic deformation of Protective grid is movable radially relative to the associated locking projection.
  • this allows the protective grid to be inserted axially into the mouth region of the passage opening, wherein the axial insertion movement, the individual locking connections can be locked by axial, manual pressing, with the locking elements each in their entirety and without their own elastic deformation only under deformation of the adjacent protective grid Move radially radially and then engage the locking lugs form-locking detent radially outward.
  • a loosening of the locking connections is advantageously possible with the reverse direction of movement by manually in the region of each locking element, a radially inwardly acting release force is applied by the locking element to release the positive locking connection can move radially inward. In this way, the individual latching connections can be successively solved until the entire protective grid is released.
  • the invention achieves important advantages, in particular a very good and secure support by a correspondingly high radial spring force in the region of individual locking elements, wherein the height of this spring force can be specified by the material and shape-dependent deformation properties of the protective grid. Due to the recessed arrangement of the protective grille in the mouth region of the passage opening in combination with the configuration of the snap connections flow-favorable properties are also achieved, but especially for applications without protective grid, because the passage opening is designed almost without protruding parts.
  • the protective grid seen in the circumferential direction between each two adjacent locking elements on a radial support portion with an end-side contact contour for radial and axial contact on an opening edge of the passage opening of the cover.
  • the support sections are axially and radially free of play with an elastic contact force on the opening edge of the passage opening.
  • This elastic contact force is also effected by a partially elastic deformation of the protective grid itself by the support sections first come into contact when inserting the protective grid, and only after further impressions under elastic deformation of the protective grid, the latching of the locking elements with the associated locking lugs.
  • a backlash is achieved by elastic bias, which disturbing noise (vibrations) can be avoided during operation.
  • a protective grid arrangement according to the invention 1 consists of a cover 2 with a particular circular air passage opening 4.
  • the cover 2 is preceded by a rotating fan, not shown, wherein the passage opening 4 forms an air inlet for the air sucked by the fan.
  • the cover 2 are also arranged downstream of a fan, wherein the passage opening 4 would form a blowout.
  • the impeller not shown, can be designed as axial fan, radial fan or diagonal fan.
  • a protective grid 6 can be fastened to the cover part 2 in the region of the passage opening 4.
  • a plurality of, in particular at least three circumferentially spaced latching connections 8 are provided.
  • Each of these latching connections 8 consists of a latching lug 10 fixedly arranged in the region of the passage opening 4 and a latching element 12 arranged on the protective lattice 6.
  • the locking elements 12 do not protrude axially from the protective grid 6, but are practically arranged on the outer edge of the protective grid 6 in the lattice plane.
  • the term "lattice plane” does not mean that the entire protective grid 6 must lie exactly in one plane, but rather the protective grid 6 can also be a lattice shape curved overall slightly convexly outwards. It is only essential that the locking elements 12 are arranged facing away from the outer edge of the protective grid 6 only radially outward.
  • the protective grid 6 is formed so resiliently deformable at least in the region of each locking element 12, that each locking element 12 for locking or releasing the locking connection 8 under regional elastic deformation of the protective grid 6, but without its own elastic deformation, radially relative to the associated locking projection 10 is movable. This radial movement is in Fig. 2 and 3 each illustrated by a double arrow 14.
  • the preferably circular passage opening 4 of the cover part 2 is preferably formed with an opening edge 16 which narrows in a nozzle-like manner from an outer side to an inner side facing the fan wheel.
  • This opening edge 16 has, in particular, a surface that is convexly curved in longitudinal section. Alternatively, it could also be a cone-shaped inclined surface.
  • the locking lugs 10 are arranged in the tapered region of the opening edge 16. As a result, the protective grid 6 can be supported not only radially but also axially on the opening edge 16.
  • each locking element 12 has a radially outwardly projecting, fork-like end portion 18 which engages around the associated locking projection 10 of the cover 2 in the circumferential direction on both sides.
  • each latching element 12 has a surface contour of the opening edge 16 of the passage opening 4 adapted support contour 20 such that the end portion 18 can be supported on its support contour 20 radially and axially on the opening edge 16.
  • a radial support section 22 is arranged in each case between two adjacent latching elements 12 for the play-free support of the protective grid 6, wherein each support section 22 has an end-side contact contour 24 for radial and axial abutment on the opening edge 16 of the passage opening 4.
  • the support portions 22 are arranged relative to the latching elements 12 such that in the latched state of the protective grid 6, the support portions 22 axially and radially rest with no play on the opening edge 16 with a resilient contact force. This contact force is generated by slight regional deformation (axial deflection) of the protective grid 6.
  • the protective grid 6 in adaptation to the circular passage opening 4 from a central, in particular circular disk-shaped central portion 26 and a plurality of concentric, each spaced over radial safety distances circular or annular protective struts 28.
  • this may also be annular.
  • the protective grid 6 has, in the region of each latching element 12, a radially inwardly extending latching strut 30 which ends at one of the protective struts 28 spaced radially from the middle section 26.
  • each locking strut 30 does not extend as far as the middle part 26, so that a radial deformation of the protective strut (s) connected to or via the locking strut 30 is possible with a certain radial force.
  • the height of the required radial force - except for the material and / or shape-dependent spring elasticity of the individual protection struts 28 of the protective grid 6 - also depends on the number of with the respective locking strut 30 connected protection struts 28 from.
  • each locking element 12 is connected via the locking strut 30 with five protection struts 28, so that the radial spring force is generated in common by the deformation of the five struts 28.
  • the amount of radial spring force on the number of involved in the elastic deformation protection struts 28 can be specified.
  • each locking element 12 and the associated locking projection 10 cooperate when joining the connection on non-designated inclined surfaces, that during locking by an axial joining movement automatically elastic radial movement of each locking element 12 is effected under regional elastic deformation of the protective grid 6. In the latched state, a positive locking is then achieved in the axial direction, because a so-called undercut angle between locking surfaces of locking lug 10 and locking element 12 is greater than / equal to 90 °.
  • each support portion 22 is formed by a free, radially projecting end of a radially inwardly extending continuously to the central portion 26 supporting strut 32 of the protective grid 6.
  • a high radial stability of the protective grid 6 is achieved, in particular in the case of an even number of support sections 22 and support struts 32 with radially symmetric distribution, because then two support struts 32 are diametrically opposite each other on a common diameter line, so that in the direction of this diameter line almost no elastic deformation in the radial direction is possible.
  • the protective grid 6 may be formed as a one-piece molded part made of plastic.
  • the protective grid 6 may also consist at least partially of metal, in particular of a metal wire.
  • the cover 2 is preferably formed as a plastic molded part, wherein the locking lugs 10 are integrally formed.
  • the cover 2 as in Fig. 1 to 3 recognizable - overall annular with a likewise circular outer contour (eg as a so-called "wall ring") or as a housing / wall part with any, eg rectangular or square outer contour with optionally rounded or bevelled corners (eg as "Frontpiatte”) may be formed.
  • the protective grid 6 has at least three, in particular as shown, four locking elements 12 in a radially symmetrical circumferential distribution. This also applies accordingly to the number and arrangement of the locking struts 30, the support sections 22 and the support struts 32nd
  • the number of circular or annular protection struts 28 is dependent on the size of the passage opening 4 to be covered and the maximum safety distances between the adjacent protection struts 28.
  • seven protection struts 28 are provided concentrically around the central central part 26 around, each locking element 12 is connected via the associated locking strut 30 with the five outer protection struts 28. Deviating from this preferred embodiment but also any other embodiments are possible.

Description

Die vorliegende Erfindung betrifft eine Schutzgitter-Anordnung für einen Lüfter, bestehend aus einem einem rotierenden Lüfterrad vor- oder nachzuordnenden Abdeckteil mit einer Luft-Durchlassöffnung und einem im Bereich der Durchlassöffnung diese zum Berührungsschutz verschließend mit dem Abdeckteil über mehrere über den Umfang verteilt angeordnete Rastverbindungen verbundenen oder verbindbaren Schutzgitter.The present invention relates to a protective grid arrangement for a fan, consisting of a rotating fan vorrad or nachordnenden cover with an air passage opening and a closing in the region of the passage opening for contact protection with the cover over several distributed over the circumference arranged detent connections or connectable protective grid.

Die Veröffentlichung DE 20 2008 002 356 U1 beschreibt verschiedene Ausführungen eines Kompaktlüfters mit einer Schutzgitter-Anordnung der oben beschriebenen, gattungsgemäßen Art. Der bekannte Kompaktlüfter weist als Abdeckteil eine Frontplatte mit einer Lufteinlassöffnung auf, die mit einem Schutzgitter zum Schutz gegen Berührungen der rotierenden Lüfterteile abgedeckt ist oder abgedeckt werden kann. Dabei kann das Schutzgitter mittels einer Klipsverbindung mit der Frontplatte verrastet werden. Dazu weist das Schutzgitter in einer ersten Ausführung an seinem Außenrand axial vorstehende Rastelemente auf, die mit Rastansätzen der Frontplatte verrastbar sind. Das Schutzgitter greift nur mit den axial vorstehenden Rastelementen etwas in den Öffnungsbereich ein, so dass das Gitter selbst deutlich über die Öffnungsebene vorsteht. Dabei ist die Befestigung allein abhängig von der Federelastizität der axial vorstehenden Rastelemente. Alternativ zu dieser verrastbaren Ausführung kann das Schutzgitter in einer anderen Ausführung auch einstückig mit der Frontplatte ausgebildet sein und dann auch etwa in der Öffnungsebene liegen.The publication DE 20 2008 002 356 U1 describes various embodiments of a compact fan with a protective grid arrangement of the generic type described above. The known compact fan has as cover a front panel with an air inlet opening, which is covered with a protective grid to protect against contact with the rotating fan parts or can be covered. In this case, the protective grid can be locked by means of a clip connection with the front panel. For this purpose, the protective grid in a first embodiment on its outer edge axially projecting locking elements which can be latched with locking lugs of the front panel. The guard meshes only slightly with the axially protruding latching elements in the opening area, so that the grid itself protrudes significantly above the opening plane. The attachment is solely dependent on the spring elasticity of the axially projecting locking elements. As an alternative to this latchable embodiment, the protective grid in another embodiment may also be integrally formed with the front panel and then also lie approximately in the opening plane.

Eine sehr ähnliche Schutzgitter-Anordnung ist in dem Dokument US 2004/0033131 A1 beschrieben, allerdings sind dabei in der Durchlassöffnung des Abdeckteils keine Rastansätze vorgesehen. Stattdessen untergreifen die selbst elastisch verformbaren, hier zungen- oder lappenartig axial und radial abstehend ausgebildeten Rastelemente (tabs) des Schutzgitters (fan grill) den inneren Öffnungsrand der Durchlassöffnung, wobei im oberen und äußeren Öffnungsbereich der sich düsenartig erweiternden Durchlassöffnung Anlagerippen (support ribs) vorgesehen sind, die sich auf dem Öffnungsrand abstützen. Im montierten Zustand wird somit das Schutzgitter dadurch gehalten, dass der Öffnungsrand der Durchlassöffnung axial zwischen den Rastelementen und den Anlagerippen des Schutzgitters sitzt. Jedes Rastelement befindet sich im Bereich des äußeren, radialen Endes einer radialen Strebe, die radial nach Innen bis zum Mittelteil des Schutzgitters verläuft.A very similar grid arrangement is in the document US 2004/0033131 A1 described, however, no locking lugs are provided in the passage opening of the cover. Instead, the self-elastically deformable latching elements (tabs) of the protective grille (fan grill), which engage here in the manner of tongues or lugs, engage under the inner opening edge of the passage opening, wherein support ribs are provided in the upper and outer opening regions of the passage opening widening like a nozzle are based on the opening edge. In the assembled state, the protective grid is thus held in that the opening edge of the passage opening sits axially between the latching elements and the abutment ribs of the protective grid. Each locking element is located in the region of the outer, radial end of a radial strut, which extends radially inwardly to the middle part of the protective grid.

Das Schutzgitter ist im Bereich jedes Rastelementes derart federelastisch verformbar ausgebildet, dass jedes Rastelement zum Verrasten und Lösen der Rastverbindung unter bereichsweiser, elastischer Verformung des Schutzgitters radial relativ zu dem inneren Rand der Durchlassöffnung bewegbar ist. (Absätze 0026-0027, Abb. 4). Hierbei wird das Rastelement selbst gebogen (Absatz 0027, "bending the tabs 30").In the region of each latching element, the protective grid is designed so as to be elastically deformable such that each latching element for latching and releasing the latching connection can be moved under zone-wise, elastic deformation of the protective grid radially relative to the inner edge of the passage opening. (Paragraphs 0026-0027, Fig. 4 ). Here, the locking element is bent itself (paragraph 0027, "bending the tabs 30").

Der vorliegenden Erfindung liegt die Aufgabe zu Grunde, eine Schutzgitter-Anordnung der beschriebenen Art so zu verbessern, dass ohne Überstand des Schutzgitters eine sichere und insbesondere auch spielfreie Rastbefestigung des Schutzgitters in der Durchlassöffnung des Abdeckteils gewährleistet ist. Das Schutzgitter soll einfach und schnell montierbar und insbesondere auch lösbar sein.The present invention is based on the object to improve a protective grid arrangement of the type described so that a safe and in particular play-free snap-fastening of the protective grid is ensured in the passage opening of the cover without protrusion of the protective grid. The protective grid should be easy and quick to install and in particular also be solvable.

Erfindungsgemäß wird dies durch die Merkmale des unabhängigen Anspruchs 1 erreicht. Vorteilhafte Ausgestaltungen der Erfindung sind in den abhängigen Ansprüchen sowie der nachfolgenden Beschreibung enthalten.This is achieved by the features of independent claim 1 according to the invention. Advantageous embodiments of the invention are contained in the dependent claims and the following description.

Demnach ist erfindungsgemäß vorgesehen, dass die Rastelemente am Außenrand des Schutzgitters in dessen Gitterebene nur radial nach außen weisend angeordnet sind, wobei das Schutzgitter im Bereich jedes Rastelementes derart federelastisch verformbar ausgebildet ist, dass jedes Rastelement zum Verrasten und Lösen der Rastverbindung unter bereichsweiser elastischer Verformung des Schutzgitters radial relativ zu dem zugehörigen Rastansatz bewegbar ist. Vorteilhafterweise kann hierdurch das Schutzgitter axial in den Mündungsbereich der Durchlassöffnung eingesetzt werden, wobei durch die axiale Einsetzbewegung die einzelnen Rastverbindungen durch axialen, manuellen Pressdruck verrastet werden können, wobei sich die Rastelemente jeweils in ihrer Gesamtheit und ohne eigene elastische Verformung nur unter Verformung des angrenzenden Schutzgitter-Bereiches radial bewegen und dann die Rastansätze formschlüssig rastend radial nach außen hintergreifen. Ein Lösen der Rastverbindungen ist vorteilhafterweise mit umgekehrter Bewegungsrichtung möglich, indem im Bereich jedes Rastelementes manuell eine radial nach innen wirkende Lösekraft aufgebracht wird, durch die sich das Rastelement zur Freigabe der formschlüssigen Rastverbindung radial nach innen bewegen lässt. Auf diese Weise können die einzelnen Rastverbindungen nacheinander gelöst werden, bis das gesamte Schutzgitter gelöst ist.Accordingly, the invention provides that the locking elements are arranged on the outer edge of the protective grid in the lattice plane only pointing radially outward, wherein the protective grid in the region of each latching element is designed elastically deformable such that each latching element for latching and releasing the latching connection under regionally elastic deformation of Protective grid is movable radially relative to the associated locking projection. Advantageously, this allows the protective grid to be inserted axially into the mouth region of the passage opening, wherein the axial insertion movement, the individual locking connections can be locked by axial, manual pressing, with the locking elements each in their entirety and without their own elastic deformation only under deformation of the adjacent protective grid Move radially radially and then engage the locking lugs form-locking detent radially outward. A loosening of the locking connections is advantageously possible with the reverse direction of movement by manually in the region of each locking element, a radially inwardly acting release force is applied by the locking element to release the positive locking connection can move radially inward. In this way, the individual latching connections can be successively solved until the entire protective grid is released.

Durch die Erfindung werden wichtige Vorteile erreicht, insbesondere eine sehr gute und sichere Halterung durch eine entsprechend hohe radiale Federkraft im Bereich der einzelnen Rastelemente, wobei die Höhe dieser Federkraft durch die material- und formabhängigen Verformungseigenschaften des Schutzgitters vorgegeben werden kann. Durch die versenkte Anordnung des Schutzgitters im Mündungsbereich der Durchlassöffnung in Kombination mit der Ausgestaltung der Rastverbindungen werden zudem strömungsgünstige Eigenschaften erreicht, insbesondere aber auch für Anwendungen ohne Schutzgitter, weil die Durchlassöffnung nahezu ohne vorstehende Teile ausgestaltet ist.The invention achieves important advantages, in particular a very good and secure support by a correspondingly high radial spring force in the region of individual locking elements, wherein the height of this spring force can be specified by the material and shape-dependent deformation properties of the protective grid. Due to the recessed arrangement of the protective grille in the mouth region of the passage opening in combination with the configuration of the snap connections flow-favorable properties are also achieved, but especially for applications without protective grid, because the passage opening is designed almost without protruding parts.

In bevorzugter Ausgestaltung der Erfindung weist das Schutzgitter in Umfangsrichtung gesehen jeweils zwischen zwei benachbarten Rastelementen einen radialen Stützabschnitt mit einer endseitigen Anlagekontur zur radialen und axialen Anlage auf einem Öffnungsrand der Durchlassöffnung des Abdeckteils auf. Vorzugsweise liegen hierbei im verrasteten Zustand des Schutzgitters die Stützabschnitte axial und radial spielfrei mit einer elastischen Anlagekraft auf dem Öffnungsrand der Durchlassöffnung auf. Diese elastische Anlagekraft wird ebenfalls durch eine bereichsweise elastische Verformung des Schutzgitters selbst bewirkt, indem beim Einsetzen des Schutzgitters zunächst die Stützabschnitte zur Anlage gelangen, und erst nach einem weitergehenden Eindrücken unter elastischer Verformung des Schutzgitters erfolgt das Verrasten der Rastelemente mit den zugehörigen Rastansätzen. Dadurch wird eine Spielfreiheit durch elastische Vorspannung erreicht, wodurch im Betrieb auch störende Geräusche (Schwingungen) vermieden werden.In a preferred embodiment of the invention, the protective grid seen in the circumferential direction between each two adjacent locking elements on a radial support portion with an end-side contact contour for radial and axial contact on an opening edge of the passage opening of the cover. Preferably, in the latched state of the protective grid, the support sections are axially and radially free of play with an elastic contact force on the opening edge of the passage opening. This elastic contact force is also effected by a partially elastic deformation of the protective grid itself by the support sections first come into contact when inserting the protective grid, and only after further impressions under elastic deformation of the protective grid, the latching of the locking elements with the associated locking lugs. As a result, a backlash is achieved by elastic bias, which disturbing noise (vibrations) can be avoided during operation.

Weitere besondere Ausführungsmerkmale werden in der Beschreibung noch erläutert werden.Other particular features will be explained in the description.

Anhand eines in der Zeichnung veranschaulichten, bevorzugten Ausführungsbeispiels soll die Erfindung genauer erläutert werden. Dabei zeigen:

Fig. 1
eine Perspektivansicht einer erfindungsgemäßen Schutzgitter-Anordnung im verbundenen, verrasteten Zustand der Bestandteile,
Fig. 2
eine entlang der Schnittlinie II-II in Fig. 1 halb geschnittene Perspektivansicht der erfindungsgemäßen Schutzgitter-Anordnung,
Fig. 3
eine Ausschnittvergrößerung des Bereiches III in Fig. 2,
Fig. 4
eine Draufsicht nur des Schutzgitters,
Fig. 5
einen Diagonalschnitt des Schutzgitters in der Ebene V-V gemäß Fig. 4 und
Fig. 6
eine Perspektivansicht des Schutzgitters nach Fig. 4.
Reference to an illustrated in the drawing, preferred embodiment, the invention will be explained in more detail. Showing:
Fig. 1
a perspective view of a protective grid arrangement according to the invention in the connected, locked state of the components,
Fig. 2
one along the section line II-II in Fig. 1 half-cut perspective view of the protective grid arrangement according to the invention,
Fig. 3
a detail enlargement of the area III in Fig. 2 .
Fig. 4
a top view only of the protective grid,
Fig. 5
a diagonal section of the protective grid in the plane VV according to Fig. 4 and
Fig. 6
a perspective view of the protective grid according to Fig. 4 ,

In den verschiedenen Figuren der Zeichnung sind gleiche Teile stets mit den gleichen Bezugszeichen versehen.In the various figures of the drawing, like parts are always provided with the same reference numerals.

Wie sich zunächst aus Fig. 1 bis 3 ergibt, besteht eine erfindungsgemäße Schutzgitter-Anordnung 1 aus einem Abdeckteil 2 mit einer insbesondere kreisförmigen Luft-Durchlassöffnung 4. Das Abdeckteil 2 wird einem nicht dargestellten rotierenden Lüfterrad vorgeordnet, wobei die Durchlassöffnung 4 einen Lufteinlass für die vom Lüfterrad angesaugte Luft bildet. Alternativ kann selbstverständlich das Abdeckteil 2 auch einem Lüfterrad nachgeordnet werden, wobei die Durchlassöffnung 4 eine Ausblasöffnung bilden würde. Das nicht dargestellte Lüfterrad kann als Axiallüfter, Radiallüfter oder auch Diagonallüfter ausgebildet sein.As it turned out first Fig. 1 to 3 results, a protective grid arrangement according to the invention 1 consists of a cover 2 with a particular circular air passage opening 4. The cover 2 is preceded by a rotating fan, not shown, wherein the passage opening 4 forms an air inlet for the air sucked by the fan. Alternatively, of course, the cover 2 are also arranged downstream of a fan, wherein the passage opening 4 would form a blowout. The impeller, not shown, can be designed as axial fan, radial fan or diagonal fan.

Um aus Sicherheitsgründen die Durchlassöffnung 4 zum Schutz vor unbeabsichtigten Berührungen des rotierenden Lüfterrades zu verschließen, kann an dem Abdeckteil 2 im Bereich der Durchlassöffnung 4 ein Schutzgitter 6 befestigt werden. Dazu sind mehrere, und zwar insbesondere mindestens drei über den Umfang verteilt angeordnete Rastverbindungen 8 vorgesehen. Jede dieser Rastverbindungen 8 besteht aus einem fest im Bereich der Durchlassöffnung 4 angeordneten Rastansatz 10 und einem an dem Schutzgitter 6 angeordneten Rastelement 12.In order to close the passage opening 4 for reasons of safety against unintentional contact with the rotating fan wheel, a protective grid 6 can be fastened to the cover part 2 in the region of the passage opening 4. For this purpose, a plurality of, in particular at least three circumferentially spaced latching connections 8 are provided. Each of these latching connections 8 consists of a latching lug 10 fixedly arranged in the region of the passage opening 4 and a latching element 12 arranged on the protective lattice 6.

Erfindungsgemäß ist hierbei vorgesehen, dass die Rastelemente 12 nicht axial vom Schutzgitter 6 vorstehen, sondern praktisch am Außenrand des Schutzgitters 6 in dessen Gitterebene angeordnet sind. Der Begriff "Gitterebene" bedeutet jedoch nicht, dass das gesamte Schutzgitter 6 genau in einer Ebene liegen muss, vielmehr kann es sich bei dem Schutzgitter 6 auch um eine insgesamt leicht konvex nach außen gewölbte Gitterform handeln. Wesentlich ist nur, dass die Rastelemente 12 vom Außenrand des Schutzgitters 6 nur radial nach außen weisend angeordnet sind. Erfindungsgemäß ist hierbei weiterhin vorgesehen, dass das Schutzgitter 6 zumindest im Bereich jedes Rastelementes 12 derart federelastisch verformbar ausgebildet ist, dass jedes Rastelement 12 zum Verrasten oder Lösen der Rastverbindung 8 unter bereichsweiser elastischer Verformung des Schutzgitters 6, jedoch ohne eigene elastische Verformung, radial relativ zu dem zugehörigen Rastansatz 10 bewegbar ist. Diese radiale Bewegung ist in Fig. 2 und 3 jeweils durch einen Doppelpfeil 14 veranschaulicht.According to the invention it is provided that the locking elements 12 do not protrude axially from the protective grid 6, but are practically arranged on the outer edge of the protective grid 6 in the lattice plane. However, the term "lattice plane" does not mean that the entire protective grid 6 must lie exactly in one plane, but rather the protective grid 6 can also be a lattice shape curved overall slightly convexly outwards. It is only essential that the locking elements 12 are arranged facing away from the outer edge of the protective grid 6 only radially outward. According to the invention, it is further provided that the protective grid 6 is formed so resiliently deformable at least in the region of each locking element 12, that each locking element 12 for locking or releasing the locking connection 8 under regional elastic deformation of the protective grid 6, but without its own elastic deformation, radially relative to the associated locking projection 10 is movable. This radial movement is in Fig. 2 and 3 each illustrated by a double arrow 14.

Die bevorzugt kreisförmige Durchlassöffnung 4 des Abdeckteils 2 ist vorzugsweise mit einem sich düsenartig von einer Außenseite zu einer dem Lüfterrad zugewandten Innenseite hin verjüngenden Öffnungsrand 16 ausgebildet. Dieser Öffnungsrand 16 weist insbesondere eine im Längsschnitt konvex gekrümmt verlaufende Oberfläche auf. Alternativ könnte es sich auch um eine konusartige Schrägfläche handeln. Hierbei sind nun die Rastansätze 10 im sich verjüngenden Bereich des Öffnungsrandes 16 angeordnet. Dadurch kann sich das Schutzgitter 6 nicht nur radial, sondern auch axial an dem Öffnungsrand 16 abstützen.The preferably circular passage opening 4 of the cover part 2 is preferably formed with an opening edge 16 which narrows in a nozzle-like manner from an outer side to an inner side facing the fan wheel. This opening edge 16 has, in particular, a surface that is convexly curved in longitudinal section. Alternatively, it could also be a cone-shaped inclined surface. Here, the locking lugs 10 are arranged in the tapered region of the opening edge 16. As a result, the protective grid 6 can be supported not only radially but also axially on the opening edge 16.

Dazu ist einerseits vorgesehen, dass jedes Rastelement 12 einen radial nach außen ragenden, gabelartigen Endabschnitt 18 aufweist, der den zugehörigen Rastansatz 10 des Abdeckteils 2 in Umfangsrichtung beidseitig umgreift. Hierdurch wird eine Sicherung des Schutzgitters 6 gegen Verdrehen um die Öffnungsachse erreicht. Im freien Endbereich des gabelartigen Endabschnittes 18 weist jedes Rastelement 12 eine an die Oberflächenkontur des Öffnungsrandes 16 der Durchlassöffnung 4 angepasste Auflagekontur 20 derart auf, dass sich der Endabschnitt 18 über seine Auflagekontur 20 radial und axial auf dem Öffnungsrand 16 abstützen kann.For this purpose, it is provided on the one hand, that each locking element 12 has a radially outwardly projecting, fork-like end portion 18 which engages around the associated locking projection 10 of the cover 2 in the circumferential direction on both sides. As a result, a backup of the protective grid 6 is achieved against rotation about the opening axis. In the free end region of the fork-like end section 18, each latching element 12 has a surface contour of the opening edge 16 of the passage opening 4 adapted support contour 20 such that the end portion 18 can be supported on its support contour 20 radially and axially on the opening edge 16.

Andererseits ist für die spielfreie Abstützung des Schutzgitters 6 in Umfangsrichtung jeweils zwischen zwei benachbarten Rastelementen 12 ein radialer Stützabschnitt 22 angeordnet, wobei jeder Stützabschnitt 22 eine endseitige Anlagekontur 24 zur radialen und axialen Anlage auf dem Öffnungsrand 16 der Durchlassöffnung 4 aufweist. Vorzugsweise sind hierbei die Stützabschnitte 22 relativ zu den Rastelementen 12 derart angeordnet, dass im verrasteten Zustand des Schutzgitters 6 die Stützabschnitte 22 axial und radial spielfrei mit einer elastischen Anlagekraft auf dem Öffnungsrand 16 aufliegen. Diese Anlagekraft wird durch geringfügige bereichsweise Verformung (axiale Durchbiegung) des Schutzgitters 6 erzeugt. Für die Anlage der Stützabschnitte 22 sind im Bereich des Öffnungsrandes 16 vorteilhafterweise keine zusätzlichen, vorstehenden Elemente vorgesehen, vielmehr ist der Öffnungsrand 16 in diesen Bereichen zur direkten Anlage der Stützabschnitte 22 glattflächig und dadurch - für Anwendungen des Abdeckteils 2 ohne das Schutzgitter 6 - strömungsgünstig ausgebildet.On the other hand, a radial support section 22 is arranged in each case between two adjacent latching elements 12 for the play-free support of the protective grid 6, wherein each support section 22 has an end-side contact contour 24 for radial and axial abutment on the opening edge 16 of the passage opening 4. Preferably, in this case the support portions 22 are arranged relative to the latching elements 12 such that in the latched state of the protective grid 6, the support portions 22 axially and radially rest with no play on the opening edge 16 with a resilient contact force. This contact force is generated by slight regional deformation (axial deflection) of the protective grid 6. For the installation of the support portions 22 advantageously no additional, protruding elements are provided in the region of the opening edge 16, but the opening edge 16 in these areas for direct contact of the support portions 22 smooth surface and thus - for applications of the cover 2 without the protective grid 6 - aerodynamically designed ,

Erfindungsgemäß besteht das Schutzgitter 6 in Anpassung an die kreisförmige Durchlassöffnung 4 aus einem zentrischen, insbesondere kreisscheibenförmigen Mittelteil 26 und mehreren konzentrischen, jeweils über radiale Sicherheitsabstände beabstandeten kreisförmigen bzw. kreisringförmigen Schutzstreben 28. Alternativ zu dem kreisscheibenförmigen Mittelteil 26 kann dieses auch ringförmig ausgebildet sein. Das Schutzgitter 6 weist im Bereich jedes Rastelementes 12 eine radial nach innen verlaufende Raststrebe 30 auf, die an einer der radial von dem Mittelteil 26 beabstandeten Schutzstreben 28 endet. Erfindungsgemäß verläuft jede Raststrebe 30 nicht bis zu dem Mittelteil 26, so dass mit einer bestimmten Radialkraft eine radiale Verformung der mit der bzw. über die Raststrebe 30 verbundenen Schutzstrebe(n) möglich ist. Hierbei hängt die Höhe der erforderlichen Radialkraft - außer von der material- und/oder formabhängigen Federelastizität der einzelnen Schutzstreben 28 des Schutzgitters 6 - auch von der Anzahl der mit der jeweiligen Raststrebe 30 verbundenen Schutzstreben 28 ab. Bei dem dargestellten, bevorzugten Ausführungsbeispiel ist jedes Rastelement 12 über die Raststrebe 30 mit fünf Schutzstreben 28 verbunden, so dass die radiale Federkraft bei Verformung gemeinsam von den fünf Schutzstreben 28 erzeugt wird. Somit kann die Höhe der radialen Federkraft über die Anzahl der an der elastischen Verformung beteiligten Schutzstreben 28 vorgegeben werden.According to the invention, the protective grid 6 in adaptation to the circular passage opening 4 from a central, in particular circular disk-shaped central portion 26 and a plurality of concentric, each spaced over radial safety distances circular or annular protective struts 28. Alternatively to the circular disk-shaped central portion 26, this may also be annular. The protective grid 6 has, in the region of each latching element 12, a radially inwardly extending latching strut 30 which ends at one of the protective struts 28 spaced radially from the middle section 26. According to the invention, each locking strut 30 does not extend as far as the middle part 26, so that a radial deformation of the protective strut (s) connected to or via the locking strut 30 is possible with a certain radial force. Here, the height of the required radial force - except for the material and / or shape-dependent spring elasticity of the individual protection struts 28 of the protective grid 6 - also depends on the number of with the respective locking strut 30 connected protection struts 28 from. In the illustrated preferred embodiment, each locking element 12 is connected via the locking strut 30 with five protection struts 28, so that the radial spring force is generated in common by the deformation of the five struts 28. Thus, the amount of radial spring force on the number of involved in the elastic deformation protection struts 28 can be specified.

Es sei noch erwähnt, dass jedes Rastelement 12 und der zugehörige Rastansatz 10 beim Fügen der Verbindung derart über nicht bezeichnete Schrägflächen zusammenwirken, dass beim Verrasten durch eine axiale Fügebewegung selbsttätig eine elastische Radialbewegung jedes Rastelementes 12 unter bereichsweiser elastischer Verformung des Schutzgitters 6 bewirkt wird. Im verrasteten Zustand wird dann in axialer Richtung ein Formschluss erreicht, weil ein so genannter Hinterschneidungswinkel zwischen Rastflächen von Rastansatz 10 und Rastelement 12 größer/gleich 90° ist.It should be noted that each locking element 12 and the associated locking projection 10 cooperate when joining the connection on non-designated inclined surfaces, that during locking by an axial joining movement automatically elastic radial movement of each locking element 12 is effected under regional elastic deformation of the protective grid 6. In the latched state, a positive locking is then achieved in the axial direction, because a so-called undercut angle between locking surfaces of locking lug 10 and locking element 12 is greater than / equal to 90 °.

In weiterer bevorzugter Ausgestaltung ist jeder Stützabschnitt 22 von einem freien, radial vorstehenden Ende einer radial nach innen durchgehend bis zu dem Mittelteil 26 verlaufenden Tragstrebe 32 des Schutzgitters 6 gebildet. Hierdurch wird eine hohe radiale Stabilität des Schutzgitters 6 erreicht, und zwar insbesondere im Falle einer geradzahligen Anzahl von Stützabschnitten 22 und Tragstreben 32 bei radialsymmetrischer Verteilung, weil dann je zwei Tragstreben 32 diametral gegenüberliegend auf einer gemeinsamen Durchmesserlinie liegen, so dass in Richtung dieser Durchmesserlinie nahezu keine elastische Verformung in radialer Richtung möglich ist.In a further preferred embodiment, each support portion 22 is formed by a free, radially projecting end of a radially inwardly extending continuously to the central portion 26 supporting strut 32 of the protective grid 6. In this way, a high radial stability of the protective grid 6 is achieved, in particular in the case of an even number of support sections 22 and support struts 32 with radially symmetric distribution, because then two support struts 32 are diametrically opposite each other on a common diameter line, so that in the direction of this diameter line almost no elastic deformation in the radial direction is possible.

Es ist zweckmäßig, das Schutzgitter 6 als einstückiges Formteil aus Kunststoff auszubilden. Alternativ kann aber das Schutzgitter 6 auch zumindest teilweise aus Metall, insbesondere aus einem Metalldraht, bestehen.It is expedient to form the protective grid 6 as a one-piece molded part made of plastic. Alternatively, however, the protective grid 6 may also consist at least partially of metal, in particular of a metal wire.

Auch das Abdeckteil 2 ist bevorzugt als Kunststoff-Formteil gebildet, wobei die Rastansätze 10 einstückig angeformt sind. Dabei kann das Abdeckteil 2 - wie in Fig. 1 bis 3 erkennbar - insgesamt ringförmig mit einer ebenfalls kreisförmigen Außenkontur (z.B. als so genannter "Wandring") oder als Gehäuse-/Wandungsteil mit beliebiger, z.B. rechteckiger oder quadratischer Außenkontur mit gegebenenfalls abgerundeten oder abgeschrägten Ecken (z.B. als "Frontpiatte") ausgebildet sein.Also, the cover 2 is preferably formed as a plastic molded part, wherein the locking lugs 10 are integrally formed. In this case, the cover 2 - as in Fig. 1 to 3 recognizable - overall annular with a likewise circular outer contour (eg as a so-called "wall ring") or as a housing / wall part with any, eg rectangular or square outer contour with optionally rounded or bevelled corners (eg as "Frontpiatte") may be formed.

Das Schutzgitter 6 weist mindestens drei, insbesondere wie dargestellt vier Rastelemente 12 in einer radialsymmetrischen Umfangsverteilung auf. Dies gilt entsprechend auch für die Anzahl und Anordnung der Raststreben 30, der Stützabschnitte 22 und der Tragstreben 32.The protective grid 6 has at least three, in particular as shown, four locking elements 12 in a radially symmetrical circumferential distribution. This also applies accordingly to the number and arrangement of the locking struts 30, the support sections 22 and the support struts 32nd

Die Anzahl der kreisförmigen bzw. kreisringförmigen Schutzstreben 28 ist von der Größe der zu überdeckenden Durchlassöffnung 4 und den maximalen Sicherheitsabständen zwischen den benachbarten Schutzstreben 28 abhängig. Im dargestellten Beispiel sind sieben Schutzstreben 28 konzentrisch um das zentrische Mittelteil 26 herum vorgesehen, wobei jedes Rastelement 12 über die zugehörige Raststrebe 30 mit den fünf äußeren Schutzstreben 28 verbunden ist. Abweichend von dieser bevorzugten Ausführung sind aber auch beliebige andere Ausführungsformen möglich.The number of circular or annular protection struts 28 is dependent on the size of the passage opening 4 to be covered and the maximum safety distances between the adjacent protection struts 28. In the example shown, seven protection struts 28 are provided concentrically around the central central part 26 around, each locking element 12 is connected via the associated locking strut 30 with the five outer protection struts 28. Deviating from this preferred embodiment but also any other embodiments are possible.

Claims (10)

  1. A protective grille arrangement (1) for a ventilator, consisting of a cover part (2) with an air passage opening (4) and of a protective grille (6) connected or connectable in the region of the passage opening (4) to the cover part (2) via a plurality of locking connections (8), arranged distributed over the circumference, so as to close the passage opening (4) as protection against contact, wherein each locking connection (8) consists of a locking lug (10) arranged in the passage opening (4) and a locking element (12) arranged on the protective grille (6), and wherein the protective grille (6) consists, in conformity with the circular passage opening (4), of a centric middle part (26) and a plurality of concentric, circular protective struts (28), wherein the locking elements (12) are arranged at the outer edge of the protective grille (6), in its grille plane, so as to only be directed radially outwards, wherein the protective grille (6) is in the region of each locking element (12) resiliently deformable in such a manner that each locking element (12) is, in order to lock and release the locking connection (8), movable radially relative to the associated locking lug (10) accompanied by elastic, region-wise deformation of the protective grille (6), however without its own elastic deformation, and wherein in the region of each locking element (12), the protective grille (6) has a radially inwards running locking strut (30) which ends at one of the protective struts (28), at a radial distance from the middle part (26).
  2. A protective grille arrangement according to claim 1, characterised in that the passage opening (4) of the cover part (2) has an opening edge (16), tapering in a nozzle-like manner from an outer side toward an inner side, with a surface running obliquely in the longitudinal section, in particular in a convexly curved manner.
  3. A protective grille arrangement according to claim 1 or 2, characterised in that each locking element (12) of the protective grille (6) has a radially outwards projecting, fork-like end portion (18) embracing the associated locking lug (10) of the cover part on both sides in the circumferential direction.
  4. A protective grille arrangement according to claim 2 or 3, characterised in that in the free end region, each locking element (12) has a bearing contour (20) adapted to the surface contour of the opening edge (16) of the passage opening (4) of the cover part (2).
  5. A protective grille arrangement according to any one of claims 2 to 4, characterised in that in the circumferential direction, between every two adjacent locking elements (12), the protective grille (6) has a radial supporting portion (22) with an end contact contour (24) for radial and axial contact with the opening edge (16) of the passage opening (4) of the cover part (2), wherein in the locked state of the protective grille (6), the supporting portions (22) preferably rest axially and radially without play on the opening edge (16) with an elastic contact force.
  6. A protective grille arrangement according to any one of claims 1 to 5, characterised in that each locking element (12) and the associated locking lug (10) cooperate in such a manner via inclined surfaces on the one hand and via locking surfaces on the other hand that, upon joining and locking, an elastic radial motion of each locking element (12) is effected automatically via the inclined surfaces by an axial joining motion and an axial form lock is guaranteed via the locking surfaces after the locking.
  7. A protective grille arrangement according to claim 5 or 6, characterised in that each supporting portion (22) is formed by a free, radially projecting end of a carrier strut (32), running continuously and radially inwards to the middle part (26), of the protective grille (6).
  8. A protective grille arrangement according to any one of claims 1 to 7, characterised in that the protective grille (6) is in the form of a one-piece shaped part of plastics material.
  9. A protective grille arrangement according to any one of claims 1 to 7, characterised in that the protective grille (6) is composed at least partially of a metal, in particular a metal wire.
  10. A protective grille arrangement according to any one of claims 1 to 9, characterised in that the protective grille (6) has at least three, in particular four, locking elements (12) in a radially symmetrical circumferential distribution.
EP20110170176 2010-07-24 2011-06-16 Protective guard assembly for ventilator Active EP2410187B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201020010623 DE202010010623U1 (en) 2010-07-24 2010-07-24 Protective grille arrangement for fans

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EP2410187A1 EP2410187A1 (en) 2012-01-25
EP2410187B1 true EP2410187B1 (en) 2013-03-06

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US (1) US9080580B2 (en)
EP (1) EP2410187B1 (en)
CN (1) CN102345624B (en)
DE (1) DE202010010623U1 (en)
DK (1) DK2410187T3 (en)
ES (1) ES2401895T3 (en)
PT (1) PT2410187E (en)

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Publication number Publication date
PT2410187E (en) 2013-03-18
EP2410187A1 (en) 2012-01-25
US9080580B2 (en) 2015-07-14
CN102345624B (en) 2015-05-20
DK2410187T3 (en) 2013-06-03
CN102345624A (en) 2012-02-08
US20120020772A1 (en) 2012-01-26
DE202010010623U1 (en) 2011-11-02
ES2401895T3 (en) 2013-04-25

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