EP2109126A2 - Explosion-proof control arrangement with explosion-proof housing - Google Patents

Explosion-proof control arrangement with explosion-proof housing Download PDF

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Publication number
EP2109126A2
EP2109126A2 EP09157308A EP09157308A EP2109126A2 EP 2109126 A2 EP2109126 A2 EP 2109126A2 EP 09157308 A EP09157308 A EP 09157308A EP 09157308 A EP09157308 A EP 09157308A EP 2109126 A2 EP2109126 A2 EP 2109126A2
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EP
European Patent Office
Prior art keywords
housing
plunger
control arrangement
arrangement according
membrane
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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.)
Granted
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EP09157308A
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German (de)
French (fr)
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EP2109126B1 (en
EP2109126A3 (en
Inventor
Hans Dr. Krause
Erich Wombacher
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Emerson Process Management GmbH and Co OHG
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Emerson Process Management GmbH and Co OHG
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Publication of EP2109126A2 publication Critical patent/EP2109126A2/en
Publication of EP2109126A3 publication Critical patent/EP2109126A3/en
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Publication of EP2109126B1 publication Critical patent/EP2109126B1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings
    • H01H9/042—Explosion-proof cases

Definitions

  • the invention relates to an explosion-proof control arrangement with an explosion-proof housing containing an electrical control unit with a mechanically operated input device for control commands, data or the like.
  • the invention has for its object to provide an explosion-proof control arrangement of the type mentioned, which is safe to operate and easy to handle and which can be made particularly inexpensive.
  • control arrangement having the features specified in claim 1.
  • Advantageous embodiments of the control arrangement are specified in the subclaims.
  • an outer wall of the explosion-proof housing is penetrated by one or more spaced-through bushings, which are flameproof and contain a longitudinally movably guided in a bore plunger, wherein the plunger on the inside of the housing a Head, which limits the mobility of the plunger outwardly as a stop, and wherein the inner ends of the plunger abut against a disposed on the inside of the housing wall, resilient member, which transmits an inwardly directed movement of the plunger on the input device.
  • the control arrangement according to the invention is easy to use, since the outer ends of the plungers can be actuated like pushbuttons with the finger.
  • the plunger which can be displaced inwardly by its actuation, can act in the interior of the housing in an analogous manner on a mechanically actuated input device of the control unit arranged there, for which purpose only one arrangement of the bushings corresponding to the input device is to be provided.
  • the design according to the invention has the further advantage that no fixed mechanical connection between the input device of the control unit and the actuating means arranged on the housing wall is required, and that the control unit located in the housing can be designed such that e.g. for maintenance purposes can also be operated directly when the housing is opened by removing the housing wall.
  • the arranged in the housing wall bushings with plungers are still easy and inexpensive to produce and insensitive to influences from inside and outside.
  • the resilient element is a membrane made of a rubber-elastic material, in particular silicone.
  • the membrane may furthermore have projecting nubs on the side facing away from the tappets, which dampen the transmission of force from the tappets to the input device and ensure that the input device can not be damaged in the prescribed impact test by means of a ball acting from outside on the housing.
  • a support body attached to the housing wall can be arranged on the inside of the membrane, which has recesses in the area of action of the plunger.
  • the freely deformable portions of the membrane are limited in their extent and ensures a uniform spring stiffness at the individual active sites.
  • the outer ends of the plungers are covered on the outside of the housing with a flexible Tastmembran, the edges of which are held by means attached to the housing panel. Through the Tastmembran the bushings are protected from the outside. Furthermore, markings for identifying the achievable by the operation of the plunger functions can be attached to the Tastmembran.
  • the bushings are preferably designed as screwed into threaded bores in the housing wall threaded bushes made of metal, which have a cylindrical bore in which a plunger is guided with matching cylindrical portion.
  • the bushings may be formed with a fitting bore in the housing wall, in which the plunger is guided.
  • the bushings containing the bushings Housing wall is a cover plate releasably connected to the housing.
  • the drawing shows a cross section through an explosion-proof control assembly 1, which is disposed in the portion of a wall 2 of an explosion-proof housing and for actuating an in-housing electrical control unit with mechanically operated input device is determined.
  • the control arrangement 1 has a plurality of flame-penetration-resistant bushings 3 penetrating the wall 2.
  • Each bushing 3 consists of a threaded bushing 4 which is screwed with an external thread in a hole 2 penetrating the wall.
  • a cylindrical plunger 6 is arranged longitudinally displaceable, the length of which is greater than the thickness of the wall 2.
  • the on the inside 7 of the end 2 lying to the wall of the plunger 6 is provided with a Lenticular head 8 of larger diameter provided which forms a cooperating with the end of the bushing 3 stop and thereby limits the outward movement of the plunger 6.
  • the outer end of the plunger 6 is rounded like a cap and forms a raised on the outside 9 of the wall 2 knobs when the head 8 abuts against the threaded bushing 4.
  • a membrane 10 is arranged, which covers all bushings 3.
  • the membrane 10 is preferably made of a flexible silicone material.
  • the membrane 10 is thickened and thereby forms inwardly projecting spherical knobs 11.
  • the membrane 10 is held by a shaped sheet metal support body 12 on the wall 2.
  • the support body 12 is secured in its projecting beyond the membrane 10 edge region by screws, not shown, on the wall 2.
  • the support body 12 at two opposite ends angled retaining tabs 13, on which an input device for a control unit arranged in the housing can be fastened such that the buttons, switches or the like of the input device directly opposite the knobs 11 at a small distance or touch the knobs 11 ,
  • the support body 12 has in the region of the knobs 11 in particular circular recesses 14, through which the knobs 11 extend therethrough.
  • the bushings 3 are covered with a flexible tactile membrane 15. Furthermore, a recessed in the sensing range of the Tastmembran 15 aperture 16 is provided, with which the Tastmembran 15 is held on the wall 2.
  • the tactile membrane 15 is pressed against the wall 2 from the outside, for example, with a finger, then the plunger 6 resting against the tactile membrane 15 at this point is moved inwards and the head 8 of the plunger 6 is lifted off the threaded bushing 4. As a result of the movement of the head 8, the nub 11 resting against it is pressed inwards, whereby the flexible membrane 10 deforms elastically. The inward movement of the knob 11 then serves to confirm the input device associated with the knob. If the tactile membrane 15 is then released, the diaphragm 10 springs back into its original position and thereby pushes the plunger 6 outwards again until it comes to rest with its head 8 against the threaded bushing 4.
  • the described explosion-proof control arrangement consists of only a few parts and is simple and inexpensive to produce.
  • the tight fit of the tappet guide in the threaded bushing the required flame resistance is guaranteed. If there is an explosion inside the housing, the plungers are securely held in place by their heads. Covering the bushings inside and out with the help of membranes protects them from soiling, so that the easy movement of the plungers over long periods of use remains ensured.

Abstract

The arrangement (1) has an explosion-proof housing including an electrical control with an input device e.g. switch. Ducts (3) penetrate into an outer wall (2) of the housing. The ducts include a pusher (6) longitudinally and movably guided into a cylindrical bore (5). The pusher includes a lenticular head (8) on an inner side of the housing. The head outwardly defines maneuverability of the pusher as a stop. An inner end of the pusher lies at a resilient flexible element, which is arranged on the inner side and transfers inwardly directed movement of the pusher to the input device.

Description

Die Erfindung betrifft eine explosionssichere Steueranordnung mit einem explosionssicheren Gehäuse, das eine elektrische Steuereinheit mit einer mechanisch zu betätigenden Eingabevorrichtung für Steuerbefehle, Daten oder dergleichen enthält.The invention relates to an explosion-proof control arrangement with an explosion-proof housing containing an electrical control unit with a mechanically operated input device for control commands, data or the like.

Die Übermittlung von beispielsweise Steuerbefehlen an eine in einem explosionssicheren Gehäuse angeordnete Steuereinheit bereitet gewisse Schwierigkeiten, weil die auf der Außenseite des Gehäuses vorzusehenden Mittel zur Befehlseingabe explosionssicher ausgeführt sein müssen. Bekannt sind hierfür u.a. optische und magnetische Einrichtungen, bei denen Sensoren im Gehäuse angeordnet sind, die optische oder magnetische Veränderungen auf der Außenseite des Gehäuses registrieren. Optisch arbeitende Steueranordnungen sind empfindlich gegen eine Beeinflussung durch Fremdlicht, so dass die Sicherheit des Betriebes nicht gewährleistet ist. Magnetisch arbeitende Einrichtungen sind umständlich in der Handhabung, da ein geeignetes, magnetisches Element zur Betätigung verfügbar sein muss. Beide Lösungen haben weiterhin den Nachteil, dass im Falle einer Wartung oder Reparatur eine Bedienung der Steuereinheit nach dem Öffnen des Gehäuses nicht ohne weiteres möglich ist.The transmission of, for example, control commands to a control unit arranged in an explosion-proof enclosure presents certain difficulties because the command input means to be provided on the outside of the enclosure must be explosion-proof. Are known u.a. optical and magnetic devices in which sensors are arranged in the housing that register optical or magnetic changes on the outside of the housing. Optically operating control arrangements are sensitive to interference by extraneous light, so that the safety of the operation is not guaranteed. Magnetic devices are cumbersome to handle since a suitable magnetic element must be available for actuation. Both solutions have the further disadvantage that in the case of maintenance or repair operation of the control unit after opening the housing is not readily possible.

Der Erfindung liegt die Aufgabe zugrunde, eine explosionssichere Steueranordnung der eingangs genannten Art zu schaffen, die betriebssicher und einfach zu handhaben ist und die besonders kostengünstig hergestellt werden kann.The invention has for its object to provide an explosion-proof control arrangement of the type mentioned, which is safe to operate and easy to handle and which can be made particularly inexpensive.

Die genannte Aufgabe wird durch eine Steueranordnung mit den in Anspruch 1 angegebenen Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Steueranordnung sind in den Unteransprüchen angegeben.The stated object is achieved by a control arrangement having the features specified in claim 1. Advantageous embodiments of the control arrangement are specified in the subclaims.

Bei der explosionssicheren Steueranordnung nach der Erfindung ist eine äußere Wand des explosionssicheren Gehäuses von einer oder mehreren, in einem Abstand voneinander angeordneten Durchführungen durchdrungen, die flammendurchschlagsfest ausgeführt sind und einen in einer Bohrung längsbeweglich geführten Stößel enthalten, wobei die Stößel auf der Innenseite des Gehäuses einen Kopf aufweisen, der die Beweglichkeit der Stößel nach außen als Anschlag begrenzt, und wobei die inneren Enden der Stößel an einem auf der Innenseite der Gehäusewand angeordneten, federnd nachgiebigen Element anliegen, welches eine nach innen gerichtete Bewegung der Stößel auf die Eingabevorrichtung überträgt.In the explosion-proof control arrangement according to the invention, an outer wall of the explosion-proof housing is penetrated by one or more spaced-through bushings, which are flameproof and contain a longitudinally movably guided in a bore plunger, wherein the plunger on the inside of the housing a Head, which limits the mobility of the plunger outwardly as a stop, and wherein the inner ends of the plunger abut against a disposed on the inside of the housing wall, resilient member, which transmits an inwardly directed movement of the plunger on the input device.

Die erfindungsgemäße Steueranordnung ist einfach zu bedienen, da die äußeren Enden der Stößel wie Drucktasten mit dem Finger betätigt werden können. Die durch ihre Betätigung nach innen verschiebbaren Stößel können im Inneren des Gehäuses in analoger Weise auf eine mechanisch zu betätigende Eingabevorrichtung der dort angeordneten Steuereinheit einwirken, wozu lediglich eine der Eingabevorrichtung entsprechende Anordnung der Durchführungen vorzusehen ist. Die erfindungsgemäße Gestaltung hat weiterhin den Vorteil, dass keine feste mechanische Verbindung zwischen der Eingabevorrichtung der Steuereinheit und den an der Gehäusewand angeordneten Betätigungsmittel erforderlich ist, und dass die im Gehäuse befindliche Steuereinheit so ausgeführt sein kann, dass sie z.B. für Wartungszwecke auch unmittelbar betätigt werden kann, wenn das Gehäuse durch Abnahme der Gehäusewand geöffnet ist. Die in der Gehäusewand angeordneten Durchführungen mit Stößeln sind weiterhin einfach und kostengünstig herstellbar und unempfindlich gegenüber Einwirkungen von innen und außen.The control arrangement according to the invention is easy to use, since the outer ends of the plungers can be actuated like pushbuttons with the finger. The plunger, which can be displaced inwardly by its actuation, can act in the interior of the housing in an analogous manner on a mechanically actuated input device of the control unit arranged there, for which purpose only one arrangement of the bushings corresponding to the input device is to be provided. The design according to the invention has the further advantage that no fixed mechanical connection between the input device of the control unit and the actuating means arranged on the housing wall is required, and that the control unit located in the housing can be designed such that e.g. for maintenance purposes can also be operated directly when the housing is opened by removing the housing wall. The arranged in the housing wall bushings with plungers are still easy and inexpensive to produce and insensitive to influences from inside and outside.

Besonders vorteilhaft ist eine Ausgestaltung der erfindungsgemäßen Steueranordnung, bei der das federnd nachgiebige Element eine Membran aus einem gummielastischen Material, insbesondere Silikon, ist. Durch eine solche Membran werden die Durchführungen von dem Innenraum des Gehäuses getrennt und der Gehäuseinnenraum zusätzlich abgedichtet. Die Federwirkung der Membran sorgt hierbei gleichzeitig dafür, dass die Stößel nach jeder Betätigung in ihre Grundstellung zurück bewegt und in dieser Stellung gehalten werden. Die Membran kann erfindungsgemäß weiterhin auf der den Stößeln abgekehrten Seite vorstehende Noppen haben, die die Kraftübertragung von den Stößeln auf die Eingabevorrichtung dämpfen und dafür sorgen, dass bei der vorgeschriebenen Schlagprüfung mittels einer von außen auf das Gehäuse einwirkenden Kugel die Eingabevorrichtung nicht beschädigt werden kann.Particularly advantageous is an embodiment of the control arrangement according to the invention, in which the resilient element is a membrane made of a rubber-elastic material, in particular silicone. Through such a membrane the bushings are separated from the interior of the housing and the housing interior is additionally sealed. At the same time, the spring action of the membrane ensures that the plungers are moved back into their basic position after each actuation and held in this position. According to the invention, the membrane may furthermore have projecting nubs on the side facing away from the tappets, which dampen the transmission of force from the tappets to the input device and ensure that the input device can not be damaged in the prescribed impact test by means of a ball acting from outside on the housing.

Zur Abstützung und Befestigung der Membran kann auf der Innenseite der Membran ein an der Gehäusewand befestigter Stützkörper angeordnet sein, der im Wirkungsbereich der Stößel Ausnehmungen aufweist. Durch den Stützkörper werden die frei verformbaren Abschnitte der Membran in ihrer Ausdehnung begrenzt und eine gleichmäßige Federsteifigkeit an den einzelnen Wirkstellen gewährleistet.For supporting and securing the membrane, a support body attached to the housing wall can be arranged on the inside of the membrane, which has recesses in the area of action of the plunger. By the support body, the freely deformable portions of the membrane are limited in their extent and ensures a uniform spring stiffness at the individual active sites.

Nach einem weiteren Vorschlag der Erfindung sind die äußeren Enden der Stößel auf der Außenseite des Gehäuses mit einer flexiblen Tastmembran bedeckt, deren Ränder mittels einer auf dem Gehäuse befestigten Blende gehalten sind. Durch Die Tastmembran sind die Durchführungen von außen geschützt. Weiterhin können auf der Tastmembran Markierungen zur Kennzeichnung der durch die Betätigung der Stößel erzielbaren Funktionen angebracht sein.According to a further proposal of the invention, the outer ends of the plungers are covered on the outside of the housing with a flexible Tastmembran, the edges of which are held by means attached to the housing panel. Through the Tastmembran the bushings are protected from the outside. Furthermore, markings for identifying the achievable by the operation of the plunger functions can be attached to the Tastmembran.

Die Durchführungen sind vorzugsweise als in Gewindebohrungen in der Gehäusewand eingeschraubte Gewindebuchsen aus Metall ausgeführt, die eine zylindrische Bohrung haben, in der ein Stößel mit passendem zylindrischen Abschnitt geführt ist. Alternativ können die Durchführungen mit einer Passbohrung in der Gehäusewand ausgebildet sein, in welcher der Stößel geführt ist. Weiterhin ist es zweckmäßig, wenn die die Durchführungen enthaltende Gehäusewand eine lösbar mit dem Gehäuse verbundene Deckelplatte ist. Hierdurch sind die in dem Gehäuse befindlichen Geräte für Wartungs- oder Reparaturzwecke von der in der Regel freiliegenden Betätigungsseite aus gut zugänglich.The bushings are preferably designed as screwed into threaded bores in the housing wall threaded bushes made of metal, which have a cylindrical bore in which a plunger is guided with matching cylindrical portion. Alternatively, the bushings may be formed with a fitting bore in the housing wall, in which the plunger is guided. Furthermore, it is expedient if the bushings containing the bushings Housing wall is a cover plate releasably connected to the housing. As a result, the devices located in the housing for maintenance or repair of the usually exposed operating side are easily accessible.

Die Erfindung wird nachfolgend anhand eines Ausführungsbeispiels näher erläutert, das in der Zeichnung dargestellt ist.The invention will be explained in more detail with reference to an embodiment which is shown in the drawing.

Die Zeichnung zeigt einen Querschnitt durch eine explosionssichere Steueranordnung 1, die in dem Abschnitt einer Wand 2 eines explosionssicheren Gehäuses angeordnet und zur Betätigung einer in dem Gehäuse befindlichen elektrischen Steuereinheit mit mechanisch zu betätigender Eingabevorrichtung bestimmt ist.The drawing shows a cross section through an explosion-proof control assembly 1, which is disposed in the portion of a wall 2 of an explosion-proof housing and for actuating an in-housing electrical control unit with mechanically operated input device is determined.

Die Steueranordnung 1 weist mehrere, die Wand 2 durchdringende, flammendurchschlagfeste Durchführungen 3 auf. Jede Durchführung 3 besteht aus einer Gewindebuchse 4, die mit einem Außengewinde in eine die Wand 2 durchdringende Bohrung eingeschraubt ist. Die Gewindebuchse 4 hat eine durchgehende zylindrische Bohrung 5. In der Bohrung 5 ist ein zylindrischer Stößel 6 längsverschiebbar angeordnet, dessen Länge größer ist als die Dicke der Wand 2. Das auf der Innenseite 7 der zur Wand 2 liegende Ende des Stößels 6 ist mit einem linsenförmigen Kopf 8 größeren Durchmessers versehen, der einen mit dem Ende der Durchführung 3 zusammenwirkenden Anschlag bildet und dadurch die nach außen gerichtete Bewegung des Stößels 6 begrenzt. Das äußere Ende des Stößels 6 ist kappenartig abgerundet und bildet einen auf der Außenseite 9 der Wand 2 erhabenen Noppen, wenn der Kopf 8 an der Gewindebuchse 4 anliegt.The control arrangement 1 has a plurality of flame-penetration-resistant bushings 3 penetrating the wall 2. Each bushing 3 consists of a threaded bushing 4 which is screwed with an external thread in a hole 2 penetrating the wall. In the bore 5, a cylindrical plunger 6 is arranged longitudinally displaceable, the length of which is greater than the thickness of the wall 2. The on the inside 7 of the end 2 lying to the wall of the plunger 6 is provided with a Lenticular head 8 of larger diameter provided which forms a cooperating with the end of the bushing 3 stop and thereby limits the outward movement of the plunger 6. The outer end of the plunger 6 is rounded like a cap and forms a raised on the outside 9 of the wall 2 knobs when the head 8 abuts against the threaded bushing 4.

Auf der Innenseite 7 der Wand 2 ist eine Membran 10 angeordnet, die sämtliche Durchführungen 3 überdeckt. Die Membran 10 besteht vorzugsweise aus einem flexiblen Silikonmaterial. An den Stellen, an denen die Köpfe 8 der Stößel 6 an der Membran 10 anliegen, ist die Membran 10 verdickt und bildet dadurch nach innen vorspringende ballige Noppen 11. Die Membran 10 ist durch einen aus Blech geformten Stützkörper 12 auf der Wand 2 festgehalten. Der Stützkörper 12 ist in seinem über die Membran 10 hinausragenden Randbereich durch nicht dargestellte Schrauben an der Wand 2 befestigt. Weiterhin weist der Stützkörper 12 an zwei entgegengesetzten Enden abgewinkelte Haltelaschen 13 auf, an denen eine Eingabevorrichtung für eine im Gehäuse angeordnete Steuereinheit derart befestigbar ist, dass die Tasten, Schalter oder dergleichen der Eingabevorrichtung den Noppen 11 unmittelbar in geringem Abstand gegenüberliegen oder die Noppen 11 berühren. Der Stützkörper 12 weist im Bereich der Noppen 11 insbesondere kreisförmige Ausnehmungen 14 auf, durch die sich die Noppen 11 hindurch erstrecken.On the inside 7 of the wall 2, a membrane 10 is arranged, which covers all bushings 3. The membrane 10 is preferably made of a flexible silicone material. At the points where the heads 8 of the plunger 6 abut against the membrane 10, the membrane 10 is thickened and thereby forms inwardly projecting spherical knobs 11. The membrane 10 is held by a shaped sheet metal support body 12 on the wall 2. The support body 12 is secured in its projecting beyond the membrane 10 edge region by screws, not shown, on the wall 2. Furthermore, the support body 12 at two opposite ends angled retaining tabs 13, on which an input device for a control unit arranged in the housing can be fastened such that the buttons, switches or the like of the input device directly opposite the knobs 11 at a small distance or touch the knobs 11 , The support body 12 has in the region of the knobs 11 in particular circular recesses 14, through which the knobs 11 extend therethrough.

Auf der Außenseite 9 der Wand 2 sind die Durchführungen 3 mit einer flexiblen Tastmembran 15 abgedeckt. Weiterhin ist eine im Tastbereich der Tastmembran 15 ausgesparte Blende 16 vorgesehen, mit der die Tastmembran 15 an der Wand 2 gehalten ist.On the outside 9 of the wall 2, the bushings 3 are covered with a flexible tactile membrane 15. Furthermore, a recessed in the sensing range of the Tastmembran 15 aperture 16 is provided, with which the Tastmembran 15 is held on the wall 2.

Wird von außen beispielsweise mit einem Finger die Tastmembran 15 gegen die Wand 2 gedrückt, so wird hierdurch der an dieser Stelle an der Tastmembran 15 anliegende Stößel 6 nach innen bewegt und der Kopf 8 des Stößels 6 von der Gewindebuchse 4 abgehoben. Durch die Bewegung des Kopfes 8 wird der an ihm anliegende Noppen 11 nach innen gedrückt, wobei sich die flexible Membran 10 elastisch verformt. Die nach innen gerichtete Bewegung des Noppens 11 dient dann zur Bestätigung der dem Noppen zugeordneten Eingabevorrichtung. Wird die Tastmembran 15 anschließend losgelassen, so federt die Membran 10 in ihre ursprüngliche Lage zurück und schiebt dadurch den Stößel 6 wieder nach außen, bis dieser mit seinem Kopf 8 wieder an der Gewindebuchse 4 zur Anlage gelangt.If the tactile membrane 15 is pressed against the wall 2 from the outside, for example, with a finger, then the plunger 6 resting against the tactile membrane 15 at this point is moved inwards and the head 8 of the plunger 6 is lifted off the threaded bushing 4. As a result of the movement of the head 8, the nub 11 resting against it is pressed inwards, whereby the flexible membrane 10 deforms elastically. The inward movement of the knob 11 then serves to confirm the input device associated with the knob. If the tactile membrane 15 is then released, the diaphragm 10 springs back into its original position and thereby pushes the plunger 6 outwards again until it comes to rest with its head 8 against the threaded bushing 4.

Die beschriebene explosionssichere Steueranordnung besteht nur aus wenigen Teilen und ist einfach und kostengünstig herstellbar. Durch die enge Passung der Stößelführung in den Gewindebuchsen ist die erforderliche Flammendurchschlagsfestigkeit gewährleistet. Kommt es zu einer Explosion im inneren des Gehäuses, so werden die Stößel durch ihre Köpfe in ihrer Lage sicher festgehalten. Die Abdeckung der Durchführungen innen und außen mit Hilfe von Membranen schützt diese vor Verschmutzung, so dass die leichte Verschiebbarkeit der Stößel über lange Nutzungszeiträume gewährleistet bleibt.The described explosion-proof control arrangement consists of only a few parts and is simple and inexpensive to produce. The tight fit of the tappet guide in the threaded bushing the required flame resistance is guaranteed. If there is an explosion inside the housing, the plungers are securely held in place by their heads. Covering the bushings inside and out with the help of membranes protects them from soiling, so that the easy movement of the plungers over long periods of use remains ensured.

Claims (10)

Explosionssichere Steueranordnung mit einem explosionssicheren Gehäuse, das eine elektrische Steuereinheit mit einer mechanisch zu betätigenden Eingabevorrichtung enthält, wobei eine äußere Wand (2) des Gehäuses von wenigstens einer Durchführung (3) durchdrungen ist, die flammendurchschlagsfest ausgeführt ist und einen in einer Bohrung (5) längsbeweglich geführten Stößel (6) enthält, wobei der Stößel (6) auf der Innenseite (7) des Gehäuses einen Kopf (8) aufweist, der die Bewegbarkeit des Stößels (6) nach außen als Anschlag begrenzt und wobei das innere Ende des Stößels (6) an einem auf der Innenseite (7) der Wand angeordneten, federnd nachgiebigen Element anliegt, welches eine nach innen gerichtete Bewegung des Stößels (6) auf die Eingabevorrichtung überträgt.Explosion-proof control arrangement with an explosion-proof housing, which contains an electrical control unit with a mechanically operated input device, wherein an outer wall (2) of the housing is penetrated by at least one bushing (3), which is made flameproof and one in a bore (5) longitudinally movably guided plunger (6), wherein the plunger (6) on the inside (7) of the housing has a head (8) which limits the mobility of the plunger (6) outwardly as a stop and wherein the inner end of the plunger ( 6) abuts against a resilient element disposed on the inside (7) of the wall, which transmits an inward movement of the plunger (6) to the input device. Steueranordnung nach Anspruch 1, dadurch gekennzeichnet, dass das federnd nachgiebige Element eine Membran (10) aus einem gummielastischen Material, insbesondere Silikon, ist.Control arrangement according to claim 1, characterized in that the resilient element is a membrane (10) made of a rubber-elastic material, in particular silicone. Steueranordnung nach Anspruch 2, dadurch gekennzeichnet, dass die Membran (10) auf der des Stößels (6) abgekehrten Seite einen vorstehenden Noppen (11) aufweist.Control arrangement according to claim 2, characterized in that the membrane (10) on the side facing away from the plunger (6) side has a protruding nubs (11). Steueranordnung nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass auf der Innenseite der Membran (10) ein an der Gehäusewand befestigter Stützkörper (12) angeordnet ist, der im Wirkungsbereich des Stößels eine Ausnehmung (14) aufweist.Control arrangement according to one of claims 2 or 3, characterized in that on the inside of the membrane (10) a fixed to the housing wall supporting body (12) is arranged, which has a recess (14) in the region of action of the plunger. Steueranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die äußeren Enden des Stößels (6) auf der Außenseite (9) des Gehäuses mit einer flexiblen Tastmembran (15) bedeckt ist.Control arrangement according to one of the preceding claims, characterized in that the outer ends of the plunger (6) on the outer side (9) of the housing with a flexible Tastmembran (15) is covered. Steueranordnung nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Ränder der Tastmembran (15) mittels einer auf dem Gehäuse befestigte Blende (16) gehalten sind.Control arrangement according to the preceding claim, characterized in that the edges of the feeler membrane (15) are held by means of a cover (16) fixed on the housing. Steueranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Durchführung (3) in einer Gewindebohrung in der Gehäusewand (2) eingeschraubte Gewindebuchse (4) aufweist.Control arrangement according to one of the preceding claims, characterized in that the passage (3) has a threaded bore in the housing wall (2) screwed threaded bushing (4). Steueranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Durchführung (3) eine in der Gehäusewand (2) ausgebildete Passbohrung aufweist, in denen der Stößel (6) geführt ist.Control arrangement according to one of the preceding claims, characterized in that the passage (3) has a fitting bore formed in the housing wall (2) in which the plunger (6) is guided. Steueranordnung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die die Durchführung (3) aufweisende Gehäusewand (2) eine lösbar mit dem Gehäuse verbundene Deckelplatte ist.Control arrangement according to one of the preceding claims, characterized in that the housing (2) having the lead-through (3) is a cover plate detachably connected to the housing. Steueranordnung nach einem der vorhergehenden Ansprüche, gekennzeichnet durch mehrere in einem Abstand voneinander angeordnete, flammendurchschlagsfeste Durchführungen (3), die jeweils gemeinsam auf der Innenseite der Gehäusewand (2) der Membran (10) und der Außenseite der Gehäusewand (2) der Tastmembran (15) zugeordnet sind.Control arrangement according to one of the preceding claims, characterized by a plurality of spaced-apart, flame-proof bushings (3), which in each case together on the inside of the housing wall (2) of the membrane (10) and the outside of the housing wall (2) of the Tastmembran (15 ) assigned.
EP09157308.9A 2008-04-09 2009-04-03 Explosion-proof control arrangement with explosion-proof housing Active EP2109126B1 (en)

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DE102008018074A DE102008018074A1 (en) 2008-04-09 2008-04-09 Explosion-proof control arrangement with an explosion-proof housing

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EP2109126A2 true EP2109126A2 (en) 2009-10-14
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9006590B2 (en) 2011-08-03 2015-04-14 Rosemount Analytical Inc. Flame-quenching keypad assembly

Citations (3)

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Publication number Priority date Publication date Assignee Title
DE2617965A1 (en) * 1976-04-24 1977-10-27 Bbc Brown Boveri & Cie PRESSURE-RESISTANT HOUSING WITHOUT GAP
DE3406295A1 (en) * 1983-02-23 1984-08-30 Karl 7108 Möckmühl Kapfer Explosion-proof illuminated switch and illuminated push button
DE19757023A1 (en) * 1997-12-20 1999-06-24 Eao Esa Elektro Zweigniederlas Switch arrangement with explosion protection

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Publication number Priority date Publication date Assignee Title
GB9021188D0 (en) * 1990-09-28 1990-11-14 Telektron Ltd Membranes keyboard for pressurisation protection systems

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Publication number Priority date Publication date Assignee Title
DE2617965A1 (en) * 1976-04-24 1977-10-27 Bbc Brown Boveri & Cie PRESSURE-RESISTANT HOUSING WITHOUT GAP
DE3406295A1 (en) * 1983-02-23 1984-08-30 Karl 7108 Möckmühl Kapfer Explosion-proof illuminated switch and illuminated push button
DE19757023A1 (en) * 1997-12-20 1999-06-24 Eao Esa Elektro Zweigniederlas Switch arrangement with explosion protection

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9006590B2 (en) 2011-08-03 2015-04-14 Rosemount Analytical Inc. Flame-quenching keypad assembly

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EP2109126A3 (en) 2014-03-05
DE102008018074A1 (en) 2009-10-15

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