EP1571350B1 - Safety guard for fan - Google Patents

Safety guard for fan Download PDF

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Publication number
EP1571350B1
EP1571350B1 EP05004847A EP05004847A EP1571350B1 EP 1571350 B1 EP1571350 B1 EP 1571350B1 EP 05004847 A EP05004847 A EP 05004847A EP 05004847 A EP05004847 A EP 05004847A EP 1571350 B1 EP1571350 B1 EP 1571350B1
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EP
European Patent Office
Prior art keywords
support
support braces
wire
fan
safety guard
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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.)
Not-in-force
Application number
EP05004847A
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German (de)
French (fr)
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EP1571350A1 (en
EP1571350B2 (en
Inventor
Uwe Stadtmüller
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STADTMUELLER, UWE
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Individual
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Application filed by Individual filed Critical Individual
Priority to SI200530018T priority Critical patent/SI1571350T1/en
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Publication of EP1571350B1 publication Critical patent/EP1571350B1/en
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Publication of EP1571350B2 publication Critical patent/EP1571350B2/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

Definitions

  • the invention is based on a protective grille for fans and a method for its production.
  • Protective grids protect fan rotors, for example from axial fans, against external contact. They consist of generally arranged concentrically to the axis of rotation of the fan motor grid rings made of wire, which are attached to radially arranged support struts or support arms, usually welded. The support struts in turn consist of hairpin-like bent wire loops, as shown for example in DE 33 11 660 C2. Its spatial shape receives the protective grid by repeatedly bending this wire loops with different angles (DE 299 00 923 U1).
  • the protective grille on the wall, in which the fan is installed attached.
  • a screw on the hairpin-like bent so the outer circle of the protective grid descriptive end of the support struts inserted through the wire loop and bolted to the wall.
  • the inner circle of the protective grid end of the support struts of the fan motor with its stator or its bearing plate with the protective grid is firmly screwed.
  • the entire protective grid is coated, usually powder-coated.
  • the coating must be closed, ie no areas should remain uncoated, because such uncoated areas cause corrosion.
  • Such hidden spots, which are difficult or impossible to reach from the coating are present at the mounting locations of the support struts for the fan motor.
  • the support struts which terminate here as two parallel wires, provided on both sides with mounting plates, which connect the two wires together for technological reasons.
  • the Mounting pads are welded to the ends of the two wires.
  • a cavity, into which the coating material is difficult to form is formed between the attachment plates.
  • Another disadvantage is that attaching the metal plate associated with an additional technological effort.
  • the protective grid according to the invention with its characterizing features of claim 1 has the advantage that the support struts are designed at least at the attachment point for the fan motor constructive so that they have a wide contact surface for the bearing plate or the stator, but no more hidden areas , As a result, the critical attachment points can be completely coated in a simple manner, so that corrosion of the support struts is avoided due to a lack of coating from the inside.
  • the support struts are formed as endless loops, ie they are completely closed, so also the attachment point for the fan motor is just like her opposite end, which is attached to a wall, designed hairpin-like.
  • the wide contact surface for the stator bush or the end shield is flattened reached the inner hairpin-like bent end of the support strut.
  • This flattening also prevents the steel wire of the support strut, which is harder than the material of the end shield or the stator bushing of the fan motor, from pressing into the stator bush or the end shield at the attachment points, as a result of which the fan motor would become loose.
  • the flattening of the inner end of the support strut is also technologically much easier than welding the metal plate.
  • the outer hairpin-like bent end which is fastened to the wall, have a flattening, whereby in this area also a better investment of the support strut on the wall or the fastening means is achieved on the support strut.
  • the cross section of the two parallel legs of the support strut at its flattened end is equal to its output cross-section.
  • the end cross-section present after the flattening may of course also be smaller, as long as the strength requirements of the connection of the support struts to the fan or the wall are still met.
  • the flattening of the support strut on one side or on both sides to be available.
  • a one-sided flattening it goes without saying that the side of the support strut bearing against the bearing plate or the stator bushing of the fan must be flattened.
  • a two-sided flattening has the advantage that the fastening means used, for example, the screw or the nut rests on a flat surface.
  • the flattened surface of the inner end of the support strut as viewed in plan view, have a rectangular shape, d. H. the U-shaped course of the hairpin-like end of the support strut is straightened on the outside. This can be advantageous in cases in which the mounting surface of bearing plate or Statorbuchsc is relatively small and the round outlet of the support strut would interfere with this.
  • the inventive method for producing the support struts according to claim 7 has the advantage that the support strut much easier, namely without the use of additional parts to ensure a flat system for the fan, produce and coat.
  • the wire is formed into a closed loop and the two ends of the loop at the junction blunt or otherwise connected together, for example by welding.
  • the or the hairpin-like ends of the support strut by a machining, for example, milling or grinding produced.
  • a machining for example, milling or grinding produced.
  • the flattening by a forming process for example by upsetting to produce.
  • a sufficiently large transition from the larger to the smaller cross-section will have to be provided here as well, but a flattening produced in this way has a considerably higher strength, since the engagement in the material structure during forming is substantially lower than during a machining operation.
  • a material compaction is deliberately generated during the forming process. This is for example possible because the cross section of the support strut in the region of the flattening, so after the forming process, is smaller than the output cross-section.
  • the flattening of the or the ends of the support strut takes place after attaching the grid rings on the support struts in a single operation. This can be quite advantageous in terms of production engineering since the production time is reduced when using a multiple tool.
  • a support strut 1 which determines the spatial shape of the protective grid to recognize.
  • several support struts 1 are usually arranged at the same angle radially relative to one another and grid rings are fastened to them. It consists, as can be seen from Fig. 2, of a haarnadclartig bent closed Drahtschlaufc, wherein the ends of the wire in the region of the parallel course of the two wire legs are butt welded together. The connection point is indicated by a weld 2.
  • the wire loop has a long, dull-angled leg 3 and a short, at right angles to the long leg 1 angled leg 4, whose end is again bent at right angles, on.
  • an eyelet 5 Defected by the latter angulation, as seen from Fig. 2, an eyelet 5.
  • the eyelets 5 are therefore on an outer circle. With them, the protective grid is attached to a wall having an opening for the fan.
  • the depth of the protective grid is determined, which depends essentially on the installation depth of the fan.
  • the long, dull-angled leg 3 is angled once more at its free end, this short angled part 6 runs parallel to the eyelet 5. Its hairpin-like end is reduced in cross-section, so that the support strut 1, as shown in FIG.
  • the flattened eyelets 7 are located on an inner circle of the protective grid. At you the fan, for example, with its stator or its end shield, attached.
  • the inner eyelet 7 of the support strut to which the fan is attached flattened.
  • the flattening was done by an upsetting process, as a result, it comes in this area to a double-sided reduction in thickness and a flow of material in the longitudinal direction of the support strut, so that the flattened eyelet 7 slightly extended.
  • the radii-shaped outlet of the flattened eyelet 7 was separated, so that here a flat surface 8 is formed.
  • the thickness reduction of the flattened eyelet 7 is shown disproportionately strong in the drawing in order to illustrate the invention. In practice, the reduction in the thickness of the wire in this area is much lower. The degree of deformation may only be so strong that the structural changes associated with it do not result in a loss of strength.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Compressor (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)

Abstract

The protective grid has radially mounted support webs (1) and is connectable to the ventilator. The support webs are made from closed wire loops bent U-shaped at their inner ends so that two ends (5,7) are hair-pin shaped and at least the inner end (7) of the webs is flattened. The cross-section of the two parallel arms of the support webs at the flattened end is the same as the output cross-section of the arms of the support web. Independent claim describes method for manufacturing grid by making the support webs as closed loops with the two wire ends butt-joined together so that the two ends have a hairpin shape.

Description

Stand der TechnikState of the art

Die Erfindung geht aus von einem Schutzgitter für Lüfter sowie einem Verfahren zu seiner Herstellung.The invention is based on a protective grille for fans and a method for its production.

Schutzgitter schützen Lüfterrotore, beispielsweise von Axiallüftern, gegen Berührung von außen. Sie bestehen aus im allgemeinen konzentrisch zur Drehachse des Lüftermotors angeordneten Gitterringen aus Draht, die an radial angeordneten Tragstreben bzw. Halterungsarmen befestigt, meist angeschweißt sind. Die Tragstreben wiederum bestehen aus haarnadelartig gebogenen Drahtschlaufen, wie sie beispielsweise in der DE 33 11 660 C2 gezeigt sind. Seine räumliche Gestalt erhält das Schutzgitter durch ein mehrfaches Abwinkeln dieser Drahtschlaufen mit unterschiedlichen Winkeln (DE 299 00 923 U1).Protective grids protect fan rotors, for example from axial fans, against external contact. They consist of generally arranged concentrically to the axis of rotation of the fan motor grid rings made of wire, which are attached to radially arranged support struts or support arms, usually welded. The support struts in turn consist of hairpin-like bent wire loops, as shown for example in DE 33 11 660 C2. Its spatial shape receives the protective grid by repeatedly bending this wire loops with different angles (DE 299 00 923 U1).

In der Regel sind die Schutzgitter an der Wandung, in die der Lüfter eingebaut wird, befestigt. Hierzu wird jeweils eine Schraube an dem haarnadelartig gebogenen, also dem den Außenkreis des Schutzgitters beschreibenden Ende der Tragstreben durch die Drahtschlaufe hindurch gesteckt und mit der Wandung verschraubt. An dem gegenüberliegenden, also auf dem Innenkreis des Schutzgitters liegenden Ende der Tragstreben ist der Lüftermotor mit seiner Statorbuchse bzw. seinem Lagerschild mit dem Schutzgitter fest verschraubt. Diese Verbindungsstellen haben eine hohe Belastung auszuhalten. Über sie werden das Biegemoment, das der Lüftermotor auf das Schutzgitter ausübt, das durch die Rotation hervorgerufene Moment sowie alle anderen durch die Lüfterfunktion bedingten Kräfte, wie Schwingungen, An- und Abbremsmomente u. a. auf das Schutzgitter übertragen. Daher müssen diese Verbindungsstellen besonders stabil ausgebildet sein. Zur Gewährleistung einer möglichst breiten Anlagefläche zwischen Statorbuchse bzw. Lagerschild und Tragstrebe sind deshalb auch die offenen Enden der beiden parallel verlaufenden Schenkel der Drahtschlaufe mittels zweier Metallplättchen miteinander verbunden.In general, the protective grille on the wall, in which the fan is installed, attached. For this purpose, in each case a screw on the hairpin-like bent, so the outer circle of the protective grid descriptive end of the support struts inserted through the wire loop and bolted to the wall. At the opposite, so lying on the inner circle of the protective grid end of the support struts of the fan motor with its stator or its bearing plate with the protective grid is firmly screwed. These joints have to endure a high load. About them, the bending moment, which exerts the fan motor on the guard, the rotation caused by the moment and all other forces caused by the fan function, such as vibrations, arrival and Abbremsmomente u. a. transferred to the protective grid. Therefore, these joints must be made particularly stable. To ensure the widest possible contact surface between the stator bush or bearing plate and support strut therefore the open ends of the two parallel legs of the wire loop are connected to each other by means of two metal plates.

Zum Korrosionsschutz wird das gesamte Schutzgitter beschichtet, meist pulverbeschichtet. Die Beschichtung muss geschlossen sein, d. h. es dürfen keine Bereiche unbeschichtet bleiben, denn von solchen unbeschichteten Bereichen geht Korrosion aus. Derartige verdeckte Stellen, die von der Beschichtung schwer oder nicht erreicht werden, sind an den Befestigungsstellen der Tragstreben für den Lüftermotor vorhanden. Wie oben erwähnt, sind die Tragstreben, die hier als zwei parallele Drähte auslaufen, aus technologischen Gründen beiderseits mit Befestigungsplättchen versehen, die die beiden Drähte miteinander verbinden. Die Befestigungsplättchen sind an die Enden der beiden Drähte angeschweißt. Dadurch bildet sich zwischen den Befestigungsplättchen ein Hohlraum, in den das Beschichtungsmaterial nur schwer gelangt. Insbesondere zu den von Draht und Befestigungsplättchen gebildeten Innenkanten gelangt kaum Beschichtungsmaterial hin, so dass gerade diese Innenkanten häufig zu korrodieren beginnen und das Schutzgitter dadurch unbrauchbar wird. Nachteilig ist ferner, dass das Anbringen der Metallplättchen mit einem zusätzlichen technologischen Aufwand verbunden.For corrosion protection, the entire protective grid is coated, usually powder-coated. The coating must be closed, ie no areas should remain uncoated, because such uncoated areas cause corrosion. Such hidden spots, which are difficult or impossible to reach from the coating, are present at the mounting locations of the support struts for the fan motor. As mentioned above, the support struts, which terminate here as two parallel wires, provided on both sides with mounting plates, which connect the two wires together for technological reasons. The Mounting pads are welded to the ends of the two wires. As a result, a cavity, into which the coating material is difficult to form, is formed between the attachment plates. In particular, to the inner edges formed by wire and mounting plates barely reaches coating material, so that just these inner edges often begin to corrode and the protective grid is thus unusable. Another disadvantage is that attaching the metal plate associated with an additional technological effort.

Die Erfindung und ihre VorteileThe invention and its advantages

Das erfindungsgemäße Schutzgitter mit seinen kennzeichnenden Merkmalen des Patentanspruches 1 hat demgegenüber den Vorteil, dass die Tragstreben zumindest an der Befestigungsstelle für den Lüftermotor konstruktiv so ausgeführt sind, dass sie eine breite Anlagefläche für das Lagerschild bzw. die Statorbuchse besitzen, jedoch keine verdeckten Bereiche mehr aufweisen. Dadurch können auch die kritischen Befestigungsstellen auf einfache Weise vollständig beschichtet werden, so dass eine Korrosion der Tragstreben aufgrund einer mangelhaften Beschichtung von vom herein vermieden wird.The protective grid according to the invention with its characterizing features of claim 1 has the advantage that the support struts are designed at least at the attachment point for the fan motor constructive so that they have a wide contact surface for the bearing plate or the stator, but no more hidden areas , As a result, the critical attachment points can be completely coated in a simple manner, so that corrosion of the support struts is avoided due to a lack of coating from the inside.

Das wird dadurch erreicht, dass die Tragstreben als endlose Schlaufen ausgebildet werden, d. h. sie sind vollständig geschlossen, also auch die Befestigungsstelle für den Lüftermotor ist genauso wie ihr gegenüberliegendes Ende, das an einer Wandung befestigt wird, haarnadelartig gestaltet. Die breite Anlagefläche für die Statorbuchse bzw. das Lagerschild wird durch eine Abflachung des inneren haarnadelartig gebogenen Endes der Tragstrebe erreicht. Diese Abflachung verhindert auch, dass sich der gegenüber dem Material des Lagerschilds bzw. der Statorbuchse des Lüftermotors härtere Stahldraht der Tragstrebe an den Befestigungsstellen in die Statorbuchse bzw. das Lagerschild eindrückt, infolgedessen es zu einer Lockerung des Lüftermotors kommen würde. Das Abflachen des inneren Endes der Tragstrebe ist außerdem technologisch wesentlich einfacher als das Anschweißen der Metallplättchen.This is achieved in that the support struts are formed as endless loops, ie they are completely closed, so also the attachment point for the fan motor is just like her opposite end, which is attached to a wall, designed hairpin-like. The wide contact surface for the stator bush or the end shield is flattened reached the inner hairpin-like bent end of the support strut. This flattening also prevents the steel wire of the support strut, which is harder than the material of the end shield or the stator bushing of the fan motor, from pressing into the stator bush or the end shield at the attachment points, as a result of which the fan motor would become loose. The flattening of the inner end of the support strut is also technologically much easier than welding the metal plate.

Selbstverständlich kann auch das äußere haarnadelartig gebogene Ende, das an der Wandung befestigt wird, eine Abflachung aufweisen, wodurch in diesem Bereich ebenfalls eine bessere Anlage der Tragstrebe an der Wandung bzw. der Befestigungsmittel an der Tragstrebe erreicht wird.Of course, the outer hairpin-like bent end, which is fastened to the wall, have a flattening, whereby in this area also a better investment of the support strut on the wall or the fastening means is achieved on the support strut.

Nach einer vorteilhaften Ausgestaltung der Erfindung ist der Querschnitt der beiden parallel verlaufenden Schenkel der Tragstrebe an ihrem abgeflachten Ende gleich ihrem Ausgangsquerschnitt. Das hat den Vorteil, dass sich das Biegemoment der Tragstrebe in diesem Bereich nicht verringert, d. h. die Tragstrebe behält ihre gerade für diesen Bereich der Befestigung des Lüfters notwendige Stabilität.According to an advantageous embodiment of the invention, the cross section of the two parallel legs of the support strut at its flattened end is equal to its output cross-section. This has the advantage that the bending moment of the support strut does not decrease in this area, d. H. the support strut retains its necessary stability for this area of attachment of the fan.

Bei einem ausreichend großen Ausgangsquerschnitt kann der nach der Abflachung vorhandene Endquerschnitt natürlich auch geringer sein, so lange die Festigkeitsanforderungen der Verbindung der Tragstreben mit dem Lüfter bzw. der Wandung noch gegeben sind.In the case of a sufficiently large output cross-section, the end cross-section present after the flattening may of course also be smaller, as long as the strength requirements of the connection of the support struts to the fan or the wall are still met.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann die Abflachung der Tragstrebe einseitig oder auch beidseitig vorhanden sein. Bei einer einseitigen Abflachung ist selbstverständlich die an dem Lagerschild bzw. der Statorbuchse des Lüfters anliegende Seite der Tragstrebe abzuflachen. Eine beidseitige Abflachung hat den Vorteil, dass auch das verwendete Befestigungsmittel, beispielsweise die Schraube oder die Mutter an einer ebenen Fläche anliegt.According to a further advantageous embodiment of the invention, the flattening of the support strut on one side or on both sides to be available. In the case of a one-sided flattening, it goes without saying that the side of the support strut bearing against the bearing plate or the stator bushing of the fan must be flattened. A two-sided flattening has the advantage that the fastening means used, for example, the screw or the nut rests on a flat surface.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung kann die abgeflachte Fläche des inneren Endes der Tragstrebe, in der Draufsicht betrachtet, eine rechteckige Form aufweisen, d. h. der U-förmige Verlauf des haarnadelartigen Endes der Tragstrebe ist außen begradigt. Das kann in den Fällen von Vorteil sein, in denen die Montagefläche von Lagerschild bzw. Statorbuchsc verhältnismäßig klein ist und der runde Auslauf der Tragstrebe hier stören würde.According to a further advantageous embodiment of the invention, the flattened surface of the inner end of the support strut, as viewed in plan view, have a rectangular shape, d. H. the U-shaped course of the hairpin-like end of the support strut is straightened on the outside. This can be advantageous in cases in which the mounting surface of bearing plate or Statorbuchsc is relatively small and the round outlet of the support strut would interfere with this.

Das erfindungsgemäße Verfahren zur Herstellung der Tragstreben nach Anspruch 7 hat den Vorteil, dass sich die Tragstrebe wesentlich einfacher, nämlich ohne Verwendung zusätzlicher Teile zur Gewährleistung einer flächigen Anlage für den Lüfter, herstellen und beschichten lässt. Der Draht wird zu einer geschlossenen Schlaufe geformt und die beiden Enden der Schlaufe an dcr Verbindungsstelle stumpf oder auf andere Weise miteinander verbunden, beispielsweise durch Schweißen.The inventive method for producing the support struts according to claim 7 has the advantage that the support strut much easier, namely without the use of additional parts to ensure a flat system for the fan, produce and coat. The wire is formed into a closed loop and the two ends of the loop at the junction blunt or otherwise connected together, for example by welding.

Nach einer vorteilhaften Ausgestaltung des Verfahrens wird das bzw. werden die haarnadelartigen Enden der Tragstrebe durch eine spanende Bearbeitung, beispielsweise Fräsen oder Schleifen hergestellt. Hier muss allerdings ein scharfer Übergang von dem schwächeren zum stärkeren Querschnitt wegen der Kerbwirkung, die von jeder spanend hergestellten Innenkante ausgeht, vermieden werden. Mit einem ausreichend großen Radius bzw. einem keilförmigen Übergang in diesem Bereich kann das Problem schon gelöst sein.According to an advantageous embodiment of the method, the or the hairpin-like ends of the support strut by a machining, for example, milling or grinding produced. Here, however, a sharp transition from the weaker to the thicker cross section due to the notch effect emanating from each machined inner edge avoided become. With a sufficiently large radius or a wedge-shaped transition in this area, the problem can already be solved.

Wesentlich günstiger ist es, nach einer weiteren vorteilhaften Ausgestaltung der Erfindung die Abflachung durch einen Umformvorgang, beispielsweise durch Stauchen, herzustellen. Natürlich wird auch hier ein ausreichend großer Übergang vom größeren zum kleineren Querschnitt vorgesehen werden müssen, jedoch weist eine so hergestellte Abflachung eine wesentlich höhere Festigkeit auf, da der Eingriff in das Materialgefüge beim Umformen wesentlich geringer ist als bei einer spanenden Bearbeitung. Durch den Umformvorgang wird sogar infolge der mit dieser Technologie verbundenen Materialverfestigung eine Erhöhung der Festigkeit der Tragstrebe in diesem Bereich erreicht.It is much cheaper, according to a further advantageous embodiment of the invention, the flattening by a forming process, for example by upsetting to produce. Of course, a sufficiently large transition from the larger to the smaller cross-section will have to be provided here as well, but a flattening produced in this way has a considerably higher strength, since the engagement in the material structure during forming is substantially lower than during a machining operation. By the forming process, an increase in the strength of the support strut is achieved in this area even as a result of the material hardening associated with this technology.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung wird bei dem Umformvorgang bewusst eine Materialverdichtung erzeugt. Das ist beispielsweise dadurch möglich, dass der Querschnitt der Tragstrebe im Bereich der Abflachung, also nach dem Umformvorgang, kleiner ist als der Ausgangsquerschnitt.According to a further advantageous embodiment of the invention, a material compaction is deliberately generated during the forming process. This is for example possible because the cross section of the support strut in the region of the flattening, so after the forming process, is smaller than the output cross-section.

Nach einer weiteren vorteilhaften Ausgestaltung der Erfindung erfolgt das Abflachen des bzw. der Enden der Tragstrebe nach dem Befestigen der Gitterringe auf den Tragstreben in einem einzigen Arbeitsgang. Das kann fertigungstechnisch durchaus von Vorteil sein, da sich bei Verwendung eines Mehrfachwerkzeug die Fertigungszeit reduziert.According to a further advantageous embodiment of the invention, the flattening of the or the ends of the support strut takes place after attaching the grid rings on the support struts in a single operation. This can be quite advantageous in terms of production engineering since the production time is reduced when using a multiple tool.

Weitere Vorteile und vorteilhafte Ausgestaltungen der Erfindung sind der nachfolgenden Beispielbeschreibung, der Zeichnung und den Ansprüchen entnehmbar.Further advantages and advantageous embodiments of the invention are the following example description, the drawings and claims removed.

Zeichnungdrawing

Ein Ausführungsbeispiel der Erfindung ist in den Zeichnungen dargestellt und im Folgenden näher beschrieben. Es zeigen

  • Fig. 1 die Seitenansicht der erfindungsgemäßen Tragstrebe und
  • Fig. 2 die Draufsicht auf diese Tragstrebe.
An embodiment of the invention is illustrated in the drawings and described in more detail below. Show it
  • Fig. 1 is a side view of the support strut according to the invention and
  • Fig. 2 is a plan view of this support strut.

Aus der in Fig. 1 dargestellten Seitenansicht ist die Form einer erfindungsgemäßen Tragstrebe 1, die die räumliche Gestalt des Schutzgitters bestimmt, zu erkennen. Zur Herstellung eines hier nicht dargestellten Schutzgitters wcrdcn mehrere Tragstreben 1 in der Regel im gleichen Winkel radial zueinander angeordnet und Gitterringe an ihnen befestigt. Sie besteht, wie aus Fig. 2 erkennbar, aus einer haarnadclartig gebogenen geschlossenen Drahtschlaufc, wobei die Enden des Drahtes im Bereich des parallelen Verlaufs der beiden Drahtschenkel stumpf miteinander verschweißt sind. Die Verbindungsstelle ist durch eine Schweißnaht 2 angedeutet. Die Drahtschlaufe weist einen langen, stumpf abgewinkelten Schenkel 3 und einen kurzen, rechtwinklig zu dem langen Schenkel 1 abgewinkelten Schenkel 4, dessen Ende nochmals rechtwinklig abgewinkelt ist, auf. Durch letztere Abwinkelung entstcht, wie aus Fig. 2 erkennbar, eine Öse 5. Bei dem Schutzgitter liegen die Ösen 5 demzufolge auf einem äußeren Kreis. Mit ihnen wird das Schutzgitter an einer Wand, die eine Öffnung für den Lüfter aufweist, befestigt. Durch die Länge des rechtwinklig abgewinkelten Schenkels 4 der Tragstrebe 1 ist die Tiefe des Schutzgitters bestimmt, die sich im wesentlichen nach der Einbautiefe des Lüfters richtet. Der lange, stumpf abgewinkelte Schenkel 3 ist an seinem freien Ende ein weiteres mal abgewinkelt, wobei dieser kurze abgewinkelte Teil 6 parallel zu der Öse 5 verläuft. Sein haarnadelartiges Ende ist im Querschnitt reduziert, so dass die Tragstrebe 1, wie aus Fig. 2 ersichtlich, an diesem inneren Ende eine abgeflachte Öse 7 aufweist, d. h. die senkrecht zu der durch die Drahtschlaufe gebildeten Ebene gemessene Dicke des Drahtes ist an diesem Ende geringer als in seinen übrigen Verlauf. Die abgeflachten Ösen 7 liegen auf einem inneren Kreis des Schutzgitters. An Ihnen wird der Lüfter, beispielsweise mit seiner Statorbuchse oder seinem Lagerschild, befestigt.From the side view shown in Fig. 1, the shape of a support strut 1 according to the invention, which determines the spatial shape of the protective grid to recognize. To produce a protective grid, not shown here, several support struts 1 are usually arranged at the same angle radially relative to one another and grid rings are fastened to them. It consists, as can be seen from Fig. 2, of a haarnadclartig bent closed Drahtschlaufc, wherein the ends of the wire in the region of the parallel course of the two wire legs are butt welded together. The connection point is indicated by a weld 2. The wire loop has a long, dull-angled leg 3 and a short, at right angles to the long leg 1 angled leg 4, whose end is again bent at right angles, on. Defected by the latter angulation, as seen from Fig. 2, an eyelet 5. In the protective grid, the eyelets 5 are therefore on an outer circle. With them, the protective grid is attached to a wall having an opening for the fan. By the length of the right angle angled Leg 4 of the support strut 1, the depth of the protective grid is determined, which depends essentially on the installation depth of the fan. The long, dull-angled leg 3 is angled once more at its free end, this short angled part 6 runs parallel to the eyelet 5. Its hairpin-like end is reduced in cross-section, so that the support strut 1, as shown in FIG. 2, at this inner end a flattened eyelet 7, ie the measured perpendicular to the plane formed by the wire loop thickness of the wire is smaller at this end as in its remaining course. The flattened eyelets 7 are located on an inner circle of the protective grid. At you the fan, for example, with its stator or its end shield, attached.

Im vorliegenden Beispiel wurde nur die innere Öse 7 der Tragstrebe, an der der Lüfter befestigt wird, abgeflacht. Dabei erfolgte die Abflachung durch einen Stauchvorgang, infolgedessen es in diesem Bereich zu einer beidseitigen Dickenreduzierung und zu einem Materialfluss in Längsrichtung der Tragstrebe kommt, so dass sich die abgeflachte Öse 7 etwas verlängerte. Damit diese Verlängerung die Montage des Lüfters nicht behindert, wurde der radienförmige Auslauf der abgeflachten Öse 7 abgetrennt, so dass hier eine ebene Fläche 8 entstanden ist. Die Dickenreduzierung der abgeflachten Öse 7 ist in der Zeichnung überproportional stark dargestellt, um die Erfindung zu verdeutlichen. In der Praxis ist die Dickenreduzierung des Drahtes in diesem Bereich wesentlich geringer. Der Umformgrad darf nur so stark sein, dass die mit ihm verbundenen Gefügeveränderungen keinen Festigkeitsverlust zur Folge haben.In the present example, only the inner eyelet 7 of the support strut to which the fan is attached, flattened. The flattening was done by an upsetting process, as a result, it comes in this area to a double-sided reduction in thickness and a flow of material in the longitudinal direction of the support strut, so that the flattened eyelet 7 slightly extended. In order for this extension does not hinder the installation of the fan, the radii-shaped outlet of the flattened eyelet 7 was separated, so that here a flat surface 8 is formed. The thickness reduction of the flattened eyelet 7 is shown disproportionately strong in the drawing in order to illustrate the invention. In practice, the reduction in the thickness of the wire in this area is much lower. The degree of deformation may only be so strong that the structural changes associated with it do not result in a loss of strength.

BezugszahlenlisteLIST OF REFERENCE NUMBERS

11
Tragstrebesupporting strut
22
SchweißnahtWeld
33
Stumpf abgewinkelter SchenkelStump angled thigh
44
Rechtwinklig abgewinkelter SchenkelRight angled leg
55
Öseeyelet
66
Abgewinkelter TeilAngled part
77
Abgeflachte ÖseFlattened eyelet
88th
Ebene FlächePlane area

Claims (11)

  1. A safety guard for fans, mainly consisting of radially arranged support braces (1) to which mesh rings are attached as a rule concentrically relative to each other, wherein the support braces (1) consist of bent wire loops if required, and at least on a part of the support braces (1) at their inner end at least a flat surface for the attachment of the fan is provided, characterized in at least the support braces (1) connectable with the fan consist of a closed wire loop also bent U-shape at their inner end so that both ends (5, 7) of the support braces (1) are formed hairpin like and that at least the inner end (7) of the support braces (1) is flattened.
  2. The safety guard according to claim 1, characterized in that the cross section of the two parallel running legs of the support brace (1) at each of their flattened ends (7) is equal to the original cross section of the legs of the support brace (1).
  3. The safety guard according to claim 1, characterized in that the cross section of the two parallel running legs of the support brace (1) at each of its flattened ends (7) is smaller than the original cross section of the legs of the support brace (1).
  4. The safety guard according to claim 3, characterized in that the flat of the end or ends (7) of the support brace (1) is formed through a one sided reduction of the cross section of the wire of the wire loop on the side of the wire facing the fan.
  5. The safety guard according to claim 3, characterized in that the flat is formed through a reduction of the cross section of the wire on both sides.
  6. The safety guard according to claims 1 to 5, characterized in that at least the inner flattened end (7) of the support brace (1) has a rectangular shape in top view.
  7. A method for the manufacture of a safety guard for fans consisting of mainly radially arranged multiply bent support braces (1) if required, which are bent into longitudinal loops from stretched wire before mesh rings as a rule arranged concentrically relative to one another are attached to these, wherein at least on a part of the support braces (1) at each of their inner ends at least one flat surface for connection with the fan is provided, characterized in that at least the support braces (1) accommodating the fan are bent in form of a closed loop and the two wire ends are butt joined with each other so that both ends (5, 7) of the wire loop have a hairpin type shape, and that at least the hairpin type bent end (7) of the support braces (1) facing to the inside is flattened in the area of their connection with the fan.
  8. The method according to claim 7, characterized in that the flattening of the end or the ends of the support braces (1) is carried out through machining, for example milling or grinding.
  9. The method according to claim 7, characterized in that the flattening of the end or the ends of the support braces (1) is carried out through non cutting processing, for example upsetting.
  10. The method according to claim 9, characterized in that with the non-cutting manufacture of the flat in this area material compaction occurs simultaneously.
  11. The method according to claims 7 to 10, characterized in that the flattening of the end or the ends (7) of the support braces (1) takes place after the attachment of the mesh rings on the support braces (1) in a single operation.
EP05004847.9A 2004-03-05 2005-03-04 Safety guard for fan Not-in-force EP1571350B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200530018T SI1571350T1 (en) 2004-03-05 2005-03-04 Safety guard for fan

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011375A DE102004011375A1 (en) 2004-03-05 2004-03-05 Protective grille for fans and method for its manufacture
DE102004011375 2004-03-05

Publications (3)

Publication Number Publication Date
EP1571350A1 EP1571350A1 (en) 2005-09-07
EP1571350B1 true EP1571350B1 (en) 2007-02-21
EP1571350B2 EP1571350B2 (en) 2016-09-28

Family

ID=34745439

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05004847.9A Not-in-force EP1571350B2 (en) 2004-03-05 2005-03-04 Safety guard for fan

Country Status (5)

Country Link
EP (1) EP1571350B2 (en)
AT (1) ATE354732T1 (en)
DE (2) DE102004011375A1 (en)
ES (1) ES2282941T3 (en)
SI (1) SI1571350T1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015004019A1 (en) * 2015-03-26 2016-09-29 Uwe Stadtmüller Guard; Method for producing a protective grille for fans
DE102016111516A1 (en) * 2016-06-23 2017-12-28 Ebm-Papst Mulfingen Gmbh & Co. Kg Mounting strut for a fan guard

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7202133U (en) † 1972-01-21 1972-04-13 Gebr Trox Gmbh FASTENING ARMS FOR AXIAL FANS
DE3210164C2 (en) * 1982-03-19 1984-09-13 Rohde & Schwarz GmbH & Co KG, 8000 München Device for fastening a fan in a housing wall of an electrical device
DE3311660A1 (en) * 1983-03-30 1984-10-04 Siemens AG, 1000 Berlin und 8000 München Axial fan
US4836751A (en) * 1988-07-25 1989-06-06 Liu Ssu Liu Detachable electric fan
DE4412193C1 (en) * 1994-04-08 1995-08-31 Guentner Gmbh Hans Drive motor unit for cooling fans
DE10003428B4 (en) * 1999-01-26 2010-09-09 Uwe Stadtmüller Method and apparatus for welding protective grids for fans driven by an electric external rotor motor
DE10111397B4 (en) * 2001-03-09 2010-04-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Protective grille for fans

Also Published As

Publication number Publication date
EP1571350A1 (en) 2005-09-07
ES2282941T3 (en) 2007-10-16
DE502005000383D1 (en) 2007-04-05
DE102004011375A1 (en) 2005-09-22
ATE354732T1 (en) 2007-03-15
SI1571350T1 (en) 2007-08-31
EP1571350B2 (en) 2016-09-28

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