EP0141099B1 - Warning device - Google Patents

Warning device Download PDF

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Publication number
EP0141099B1
EP0141099B1 EP84109896A EP84109896A EP0141099B1 EP 0141099 B1 EP0141099 B1 EP 0141099B1 EP 84109896 A EP84109896 A EP 84109896A EP 84109896 A EP84109896 A EP 84109896A EP 0141099 B1 EP0141099 B1 EP 0141099B1
Authority
EP
European Patent Office
Prior art keywords
casing
warning device
tubular holder
explosion
appliance head
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.)
Expired - Lifetime
Application number
EP84109896A
Other languages
German (de)
French (fr)
Other versions
EP0141099A2 (en
EP0141099A3 (en
Inventor
Reinhold Barlian
Martin Fischle
Karl-Heinz Lux
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to AT84109896T priority Critical patent/ATE59244T1/en
Publication of EP0141099A2 publication Critical patent/EP0141099A2/en
Publication of EP0141099A3 publication Critical patent/EP0141099A3/en
Application granted granted Critical
Publication of EP0141099B1 publication Critical patent/EP0141099B1/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F9/00—Devices preventing sparking of machines or apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V25/00—Safety devices structurally associated with lighting devices
    • F21V25/12—Flameproof or explosion-proof arrangements
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
    • G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
    • G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V31/00—Gas-tight or water-tight arrangements
    • F21V31/04—Provision of filling media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2111/00—Use or application of lighting devices or systems for signalling, marking or indicating, not provided for in codes F21W2102/00 – F21W2107/00

Definitions

  • the invention relates to an explosion-proof electrical signaling device with the features of the preamble of claim 1.
  • a warning lamp is known from the USA 4142179, which can be used in potentially explosive areas. This large-volume warning lamp is not intended for installation in a control cabinet or the like.
  • the lamp comprises a lighting element and control means which are electrically connected to the lighting element and are provided in a housing.
  • the housing has a passage that extends from the interior to the potentially explosive atmosphere and is so narrow that the atmosphere cannot enter the interior, but in the event of a short circuit, any hot gases can escape, which cool down, so that none Explosion can occur.
  • three quenching chambers are provided in the warning lamp for cooling the gas.
  • a control circuit is located in an explosion-proof enclosure of the warning lamp housing, which is connected upstream of the warning lamp. The prevention of an explosion in the event of damage is not achieved by electrotechnical intrinsic safety measures, but by fluidic cooling of the hot gases in the narrow threaded gaps of the warning lamp.
  • an explosion-proof indicator light is known, the light elements of which can consist of LEDs.
  • the light source is provided in a holder, in the explosion-proof interior of which the connections of the light source and a connecting line are firmly connected.
  • the interior is filled with casting resin.
  • the object of the invention is to develop a signaling device of the type described at the outset with the features of the preamble of claim 1 in such a way that pressure-resistant encapsulation is saved in the area of the device head and high intrinsic safety against explosion risk is achieved with simple means and the device head can be fastened in a control cabinet wall hole at any time can be assembled and disassembled or replaced in a potentially explosive atmosphere without special tools.
  • a western advantage is that there is a high level of electrical intrinsic safety against the risk of explosion, which means that pressure-tight encapsulation of the device head area is not necessary.
  • Another significant advantage is that the device head can be easily installed or replaced by hand in the potentially explosive area without the aid of special tools.
  • a separate insert body is provided, which is screwed to a front ring from behind and from the front.
  • a holding frame detachably connected to the device head is provided for the housing. A quickly connectable coaxial plug connection between the housing and the device head is achieved via a feed part.
  • the device head 1 shown in Fig. 1 is releasably attached to the front wall 2 of a cabinet or the like without special tools.
  • the device head has an insert body 3 which penetrates a hole 4 in the wall 2.
  • the insert body has a shoulder 5 which is supported on the outside 6 of the wall 2 with the interposition of a rubber-elastic seal 7.
  • a fastening nut 9, which is mounted on a threaded part 10 of the insert body 3, is screwed against the inside 8 of the wall 2.
  • the device head 1 also has a front ring 11 which is screwably mounted on a thread 12 formed on the shoulder 5 of the insert body 3 in the direction toward the outside 6 of the wall 2 and thereby overlaps a translucent cover 13 on its circumference and against the insert body 3 sets with the interposition of an elastic sealing washer 14.
  • the translucent cover 13 covers a lens 15, for example in the colors red, green, blue, yellow, etc., which in turn covers a signaling part designed here as a lighting element 16.
  • the luminous element 16 is arranged in the region of a reflector 17, which in the present exemplary embodiment is preferably made of plastic and whose reflector surface is white. It may also be expedient to provide the reflector 17 with a metallic reflection layer, which can be produced, for example, by metallization in a high vacuum (metal vapor deposition).
  • the lighting element (16) is particularly advantageous here as an optoelectronic CERLED lightweight part executed by preferably six to eight CERLED components 19 are arranged on a carrier plate 18, it also being within the scope of the invention, less, for example three or four, or more, for example fifteen, CERLED on the carrier plate - Arrange components 19.
  • the CERLED components essentially consist of a small ceramic carrier on which an LED chip is attached.
  • the ceramic carrier of the CERLED component 19 can expediently be provided with a conductive coating on four sides (surface, underside and both end faces).
  • the ceramic carrier the dimensions of which can be, for example, about 3.2 by 1.27 by 0.6 millimeters, is bonded on the top with an LED chip.
  • a crystal-clear plastic lens about 0.6 millimeters high is arranged above the LED chip, which comprehensively protects the LED chip on the top of the ceramic carrier.
  • This module or CERLED component 19 can be attached to corresponding conductor tracks with its conductive underside and / or with the conductive end faces on the carrier plate 18. It is also possible to apply individual lighting parts directly to a larger ceramic circuit board, so that a CERLED lighting unit is thus formed.
  • the lighting element 16 can also have one or more glow lamps, incandescent lamps, filaments, light-emitting diodes and the like.
  • the entire light-emitting element 16 is embedded in the reflector 17 in a casting part 20 which is translucent, so that the light emitted by the lighting element 16 can radiate through the casting part 20, the lens 15 and the cover 13 to the outside.
  • the reflector 17 is associated with a luminaire housing 21, the base wall 22 of which is penetrated by a contact bolt 23 which projects out of the insert body 3 at the bottom.
  • the contact pin 23 has an inner axial conductor 24, from which a connecting conductor 25 is guided to the lighting element 16.
  • the axial conductor 24 is located in a tubular insulating sleeve 26 which is somewhat shorter than the axial conductor 24, so that an upper connection end for the connecting conductor 25 and a lower contact part protrude on the opposite end faces of the insulating sleeve 26.
  • the insulating sleeve 26 is in turn surrounded by a metallic sleeve conductor 27, which is somewhat shorter than the insulating sleeve 26, so that the latter protrudes from the sleeve conductor 27 on both ends.
  • the sleeve conductor 27 has a collar 28 which rests in the lamp housing 21 on the inner surface of the base wall 22 for support.
  • a further connecting conductor 29 is preferably connected to the collar 28 by means of a solder connection, which is also led to the lighting element 16.
  • a housing 30 is associated with the device head 1, as is shown essentially in FIGS. 2 and 3.
  • the device head 1 is releasably attached to the housing 30 or detachably coupled to the housing 30, so that a complete signaling device 31 is provided in the coupling state.
  • the contact pin 23 of the device head 1 is located in a pipe socket 32 of the housing 30.
  • the pipe socket 32 and the contact pin 23 inserted therein together form a supply part 33 for the voltage supply to the signaling part or lighting element 16.
  • the pipe socket 32 has an insertion bevel 34 for the contact bolt 23 on the free inner edge area facing the device head 1.
  • an end flange 35 is formed which is supported on an inner surface of the housing 30.
  • a closure cap 36 is arranged in the region of the end flange 35, which closes the pipe socket 32 at its lower end region.
  • the closure cover 36 has on its side facing the interior of the pipe socket 32 a trough 37 into which the free end of the contact bolt 23 or the auxiliary conductor 24 protruding from the device head 1 can penetrate.
  • two electrically conductive base webs 38, 38 ′ are arranged, which are diametrically opposite one another and extend in the longitudinal direction of the pipe socket 32.
  • the base webs 38, 38 ' are overlapped at their free ends pointing in the direction of the housing head 1 by inwardly projecting wall parts 39 of the tube mount 32, thereby ensuring that the base webs 38, 38' are firmly held in the tube mount 32.
  • the base web 38 is somewhat shorter than the opposite base web 38 '.
  • a contact spring 40 formed integrally with the material is located on the base web 38, while a further contact spring 40 'is formed on the base web 38'.
  • the contact springs 40, 40 ' are directed obliquely inwards towards the center of the axis and the closure cover 36 of the pipe socket 32, so that the contact bolt 23 of the device head 1 can be inserted into the pipe socket 32 without hindrance and a permanent bending of the contact springs 40, 40' is avoided is.
  • the contact springs 40, 40 ' have corresponding contact tips at their free ends, the contact tip of the contact spring 40 resting on the free end region of the axial conductor 24 and the contact tip of the other contact spring 40' resting on the outer surface of the sleeve conductor 27.
  • Conductor connections 41, 41 ' are formed on the base webs 38, 38' and, in the present exemplary embodiment, in the region of the closure cover 36 are guided outwards at right angles in opposite directions out of the pipe socket 32.
  • Connections 42, 42 ′′, which lead to an electronic circuit board 43, are connected to the conductor connections 41, 41 ′.
  • the pipe socket 32 is surrounded on its outer circumference by a pressure piece 44 which is guided axially displaceably on the pipe socket 32 in its longitudinal direction.
  • the pressure piece 44 is spring-loaded in that a helical compression spring 45, which also surrounds the pipe socket 32, is supported at one end on the housing 30 and at the other end in a Ring groove of the pressure piece 44 engages and the latter pushes upwards towards the device head 1.
  • the housing 30 has an approximately hood-shaped holding frame 46, which is connected to the housing 30 by means of a releasable locking or clip lock.
  • a spring clip 47 is provided, which effects the releasable coupling between the device head 1 and the housing 30.
  • An explosion-proof, pressure-resistant space 48 is located under the pipe socket 32, approximately in the central region of the housing 30. At least one voltage limiter and a current limiter (not visible here) are stored in this pressure-proof space 48, so that the voltage supplied to the lighting element 16 in the device head 1 corresponds to the explosion protection Intrinsic safety (EN 50020) is limited to a maximum of 18 V and the maximum permissible current flowing here is limited to a maximum of 30 mA.
  • This provides a high level of explosion protection with simple means, without the device head 1 being subject to a special encapsulation and special fastening, but instead being able to be safely disconnected from the housing at any time without the voltage having to be switched off and other safety precautions being taken.
  • the device head 1 with the signaling part 16 and the feed part 33 is thus designed as an explosion protection intrinsic safety unit 49, starting from the outputs of the upstream voltage and current limiters in the pressure-resistant space 48.
  • the voltage limiter in the pressure-resistant space 48 of the housing 30 can advantageously be formed from two Zener diodes connected in parallel, while the current limiter can consist of an appropriately dimensioned resistor. Instead of the resistor, however, an electronic current limiter can also be provided.
  • the voltage limiter and the current limiter are expediently arranged on the electronic circuit board 43 in the pressure-resistant space 48.
  • a transformer 50 can also be arranged in the pressure-proof space 48, which, for example, transforms a higher voltage supplied to the signaling device 31 down to the operating voltage supplied to the signaling part 16.
  • a rectifier 51 can be arranged on the electronic circuit board 43, via which an AC voltage introduced is rectified for the operation of the lighting element 16.
  • it can be expedient to provide an electronic fuse 53 on the electronic circuit board 43 which can preferably be designed as a fuse.
  • the voltage limiter, the current limiter, the electronic circuit board 43, the transformer 50, the rectifier 51, the electrical fuse 52 and the connections 42, 42 ' are enclosed by a casting resin 53, so that a secure sealing seal against an explosion hazard.
  • An epoxy resin or a polyurethane can expediently be provided as the casting resin.
  • the casting resin 53 may be expedient to set the casting resin 53 or to select different designs in such a way that the parts stored in the pressure-resistant space 48, such as voltage limiters, current limiters, circuit board 43, transformer 50, rectifier 51 and electrical fuse 52, directly from an elastic, flexible wall area of the casting resin 53 or the like are enclosed and that the actual solid casting resin potting is subsequently formed on this elastic wall area. Due to the elastic wall area, a high level of serviceability is achieved even under extreme loads, such as vibrations and fluctuating temperature intervals, so that a high degree of long-term functionality is ensured in any case.
  • the parts stored in the pressure-resistant space 48 such as voltage limiters, current limiters, circuit board 43, transformer 50, rectifier 51 and electrical fuse 52, directly from an elastic, flexible wall area of the casting resin 53 or the like are enclosed and that the actual solid casting resin potting is subsequently formed on this elastic wall area. Due to the elastic wall area, a high level of serviceability is achieved even under extreme loads, such as vibrations and fluctuating temperature intervals,
  • a latching device 54 is arranged above the pressure-proof space 48 to the right of the pipe socket 32, which has two switching locks for a shift lever by means of a corresponding link guide.
  • the locking device 54 is assigned to the pressure piece 44 and is actuated by this.
  • a stroke compensation part 55 is actuated via the pressure piece 44, which has a pot bolt 56 in which a helical compensation spring 57 is mounted.
  • the stroke compensation part 55 is covered at the top by the holding frame 46.
  • a plunger 59 which penetrates the wall 61 in an axially displaceable manner in a cylindrical, explosion-proof gap passage 60 and projects into an explosion-proof, pressure-tightly encapsulated chamber 62.
  • this chamber 62 is located to the right of the pressure-proof space 48 or next to the electrical fuse 52.
  • a microswitch 63 is mounted in the pressure-proof chamber 62, and the plunger 59 acts against the switching pin 64 thereof. For certain switching functions, it may be expedient to arrange two microswitches in the chamber 62.
  • the pressure-resistant chamber 62 like the pressure-resistant space 48, is encapsulated with explosion-proof casting resin 53.
  • the end of a hose line 65 is cast in the casting resin 53 in the area under the pressure-resistant space 48.
  • the hose line 65 has individual conductors 66 which are associated with the corresponding electrical functional parts in the housing 30.
  • a further electrical component for a further function can advantageously be used in the free spaces, in particular in the pressure-resistant chamber 62. It can also be advantageous to supply the supplied voltage at the correct level (18 V) so that the transformer 50 in the pressure-resistant space 48 can be saved. In this case, the resulting free space can be used advantageously for other parts, such as electronic components (control elements, relays, microprocessors, etc.). This provides further expedient possible uses for the signaling device 31 according to the invention.
  • the housing 30 in contrast to the housing 30 of FIG. 2, the housing 30 'has line terminals 67, to which conductor parts 68 are associated, which are embedded in the casting resin 53. No hose line is provided here, but the housing 30 'can be connected to busbars or the like.
  • the signaling device 31 also has a device head 1 'which is designed as an explosion-protected illuminated pushbutton, switching light unit or light switch attachment.
  • the lamp housing 21, in which the lighting element 16 is mounted is designed somewhat differently.
  • the lens 15 ' is surrounded by a rubber-elastic sleeve 69 and mounted on a push button 70 which is axially displaceable in the direction against the housing 30' in the device head 1 '.
  • a pressure sleeve 71 is assigned to the pushbutton 70 in the insert body 3.
  • This pressure sleeve 71 has a helical spring 72 and acts upon actuation of the push button 70 against the pressure piece 40 surrounding the pipe socket 32, through which the switching stroke is transmitted via the latching device 54, the stroke compensation part 55 and the plunger 59 to the microswitch 63. It is therefore realized in this embodiment, a pressure switch signaling device, which has a light element 16 in the push button 70 for display, the feed part to the device head 1 'and this itself being fully explosion-proof, so that no additional safety precautions are necessary.
  • the device head 1 'with the lighting element 16 and the push button 70 is designed in particular as an explosion-protected switching light unit, which, independently of the proposed invention, already has the particular advantage in itself that a switch or button and a light unit are integrated into a single structural unit are explosion-proof.
  • an explosion protection switching light unit is not yet known.
  • a temperature fuse in the pressure-tightly encapsulated space 48. This ensures that a maximum outside temperature of, for example, 80 ° C is never exceeded.
  • Another essential feature of the invention is that in the device head 1, 1 'different colored and different types of light displays can be replaced easily and without special safety precautions, so that an optimal function display can always be achieved according to the respective requirements.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mining & Mineral Resources (AREA)
  • General Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Emergency Alarm Devices (AREA)
  • Audible And Visible Signals (AREA)
  • Burglar Alarm Systems (AREA)
  • Casings For Electric Apparatus (AREA)
  • Alarm Systems (AREA)
  • Telephone Function (AREA)
  • Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)

Abstract

The surveillance signal apparatus is preferably provided a signal lamp, as an illuminated switch or as an illuminated key. It comprises a casing with electrical and electronic connections and with an apparatus heat disengageably disposed at the casing. The apparatus head comprises a signal part provided with electric voltage and preferably an illuminating element. A voltage limiter and a current limiter are disposed in an explosion-proof and pressure tight encapsulated space of the casing and they are electrically predisposed to the signal part in the apparatus head via a feed part. The apparatus head with the signal part and the feed part are formed by the output of the voltage limiter and by the output of the current limiter as an explosion protection self safety unit.

Description

Die Erfindung betrifft ein explosionsgeschütztes elektrisches Meldegerät mit den Merkmalen des Oberbegriffs des Anspruchs 1.The invention relates to an explosion-proof electrical signaling device with the features of the preamble of claim 1.

Bei bekannten Meldegeräten dieser Art ist es nachteilig, daß bei einem Einsatz in explosionsgefährdeten Räumen oder dergleichen entsprechende druckfeste Kapselungen auch für den Gerätekopf vorzusehen sind und die Montage an der Frontplatte eines Schaltschrankes oder sonstigen Einrichtung nut mit einem Spezialwerkzeug durchzuführen ist, um ein unbeabsichtigtes lösen im gefährdeten Raum zu verhindern.In known signaling devices of this type, it is disadvantageous that when used in potentially explosive atmospheres or the like, corresponding pressure-resistant encapsulations must also be provided for the device head and the assembly on the front plate of a control cabinet or other device must be carried out using a special tool in order to solve an unintentional problem prevent endangered space.

Aus der USA 4142179 ist eine Warnlampe bekannt, die in explosionsgefährdeten Bereichen eingesetzt werden kann. Diese großvolumige Warnlampe ist nicht für den Einbau in einen Schaltschrank oder dergleichen vorgesehen. Die Lampe umfaßt ein Leuchtelement und Kontrollmittel, die mit dem Leuchtelement elektrisch verbunden und in einem Gehäuse vorgesehen sind. Das Gehäuse hat einen Durchgang, der sich vom Innenraum bis zur explosionsgefährdeten Atmosphäre erstreckt und so schmal ausgebildet ist, daß die Atmosphäre nicht in den Innenraum eintreten kann, wohl aber im Falle eines Kurzschlusses etwaige heiße Gase ausströmen läßt, die sich dabei abkühlen, sodaß keine Explosion entstehen kann. Dazu sind für die Abkühlung des Gases drei Löschkammern in der Warnlampe vorgesehen. In einem explosionsgeschützt gekapselten Raum des Warnlampengehäuses befindet sich eine Steuerschaltung, die der Warnleuchte vorgeschaltet ist. Die Verhinderung einer Explosion im Falle eines Schadens wird nicht durch elektrotechnische Eigensicherheitsmaßnamen, sondern durch strömungstechnische Abkühlung der heißen Gase in engen Gewindespalten der Warnlampe erzielt.A warning lamp is known from the USA 4142179, which can be used in potentially explosive areas. This large-volume warning lamp is not intended for installation in a control cabinet or the like. The lamp comprises a lighting element and control means which are electrically connected to the lighting element and are provided in a housing. The housing has a passage that extends from the interior to the potentially explosive atmosphere and is so narrow that the atmosphere cannot enter the interior, but in the event of a short circuit, any hot gases can escape, which cool down, so that none Explosion can occur. For this purpose, three quenching chambers are provided in the warning lamp for cooling the gas. A control circuit is located in an explosion-proof enclosure of the warning lamp housing, which is connected upstream of the warning lamp. The prevention of an explosion in the event of damage is not achieved by electrotechnical intrinsic safety measures, but by fluidic cooling of the hot gases in the narrow threaded gaps of the warning lamp.

Aus der DE-A-2531968 ist eine explosionsgeschützte Meldeleuchte bekannt, deren Leuchtelemente aus LEDs bestehen kann. Die Lichtquelle ist in einem Halter vorgesehen, in dessen explosionsgeschützen Innenraum die Anschlüsse der Lichtquelle und eine Verbindungsleitung fest verbunden sind. Der Innenraum ist mittels Giesharz ausgefüllt.From DE-A-2531968 an explosion-proof indicator light is known, the light elements of which can consist of LEDs. The light source is provided in a holder, in the explosion-proof interior of which the connections of the light source and a connecting line are firmly connected. The interior is filled with casting resin.

Die Aufgabe der Erfindung besteht darin, ein Meldegerät der eingangs beschriebenen Art mit den Merkmalen des Oberbegriffs des Anspruchs 1 dahingehend weiterzubilden, daß eine druckfeste Kapselung im Gerätekopfbereich eingespart und mit einfachen Mitteln eine hohe Eigensicherheit gegen Explosionsgefahr erzielt wird und der in einem Schaltschrankwandungsloch befestigbare Gerätekopf jederzeit im explosionsgefährdeten Raum ohne Spezialwerkzeug montiert und demontiert beziehungsweise ausgetauscht werden kann.The object of the invention is to develop a signaling device of the type described at the outset with the features of the preamble of claim 1 in such a way that pressure-resistant encapsulation is saved in the area of the device head and high intrinsic safety against explosion risk is achieved with simple means and the device head can be fastened in a control cabinet wall hole at any time can be assembled and disassembled or replaced in a potentially explosive atmosphere without special tools.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.

Ein westlicher Vorteil besteht darin, daß eine hohe elektrotechnische Eigensicherheit gegen Explosionsgefahr gegeben ist, wodurch eine druckfeste Kapselung des Gerätekopfbereiches nicht erforderlich ist. Ein weiterer wesentlicher Vorteil besteht darin, daß der Gerätekopf ohne Zuhilfenahme von speziellen Werkzeugen ausschließlich von Hand im explosionsgefährdeten Raum ohne weiteres installiert oder ausgewechselt werden kann. Dazu ist ein separater Einsatzkörper vorgesehen, der von hinten und von vorn mit einem Frontring verschraubt wird. Außerdem ist für das Gehäuse ein mit dem Gerätekopf lösbar verbundener Halterahmen vorgesehen. Über einen Zuführungsteil wird eine schnell kuppelbare Koaxialsteckverbindung zwischen dem Gehäuse und dem Gerätekopf erreicht.A western advantage is that there is a high level of electrical intrinsic safety against the risk of explosion, which means that pressure-tight encapsulation of the device head area is not necessary. Another significant advantage is that the device head can be easily installed or replaced by hand in the potentially explosive area without the aid of special tools. For this purpose, a separate insert body is provided, which is screwed to a front ring from behind and from the front. In addition, a holding frame detachably connected to the device head is provided for the housing. A quickly connectable coaxial plug connection between the housing and the device head is achieved via a feed part.

Zweckmäßige Ausgestaltungen und Weiterbildungen der Erfindung sind durch die Merkmale der Unteransprüche gekennzeichnet.Expedient refinements and developments of the invention are characterized by the features of the subclaims.

Weitere Vorteile und wesentliche Einzelheiten der Erfindung sind der nachfolgenden Beschreibung und der Zeichnung zu entnehmen, die in schematischer Darstellung bevorzugte Ausführungsformen als Beispiel zeigt. Es stellen dar:

  • Fig. 1 eine geschnittene Seitenansicht eines erfindungsgemäßen Gerätekopfes,
  • Fig. 2 eine geschnittene Seitenansicht eines erfindungsgemäßen Gehäuses für einen Gerätekopf ähnlich der Fig. 1 und
  • Fig. 3 eine geschnittene Seitenansicht eines erfindungsgemäßen Meldegerätes mit am Gehäuse gekuppeltem Gerätekopf.
Further advantages and essential details of the invention can be found in the following description and the drawing, which shows preferred embodiments as an example in a schematic representation. They represent:
  • 1 is a sectional side view of a device head according to the invention,
  • Fig. 2 is a sectional side view of a housing according to the invention for a device head similar to FIGS. 1 and
  • Fig. 3 is a sectional side view of a signaling device according to the invention with the device head coupled to the housing.

Der in der Fig. 1 dargestellte Gerätekopf 1 ist an der vorderen Wand 2 eines Schaltschrankes oder dergleichen ohne Spezialwerkzeug lösbar befestigt. Der Gerätekopf besitzt einen Einsatzkörper 3, der ein Loch 4 in der Wand 2 durchsetzt. Der Einsatzkörper besitzt eine Schulter 5, die an der Außenseite 6 der Wand 2 unter Zwischenlage einer gummielastischen Dichtung 7 abgestützt ist. Gegen die Innenseite 8 der Wand 2 ist eine Befestigungsmutter 9 geschraubt, die auf einem Gewindeteil 10 des Einsatzkörpers 3 gelagert ist. Außen weist der Gerätekopf 1 zudem einen Frontring 11 auf, der an einem an der Schulter 5 des Einsatzkörpers 3 ausgebildeten Gewinde 12 in Richtung gegen die Außenseite 6 der Wand 2 schraubbar gelagert ist und dabei eine durchscheinende Abdeckhaube 13 an ihrem Umfang übergreift und gegen den Einsatzkörper 3 unter Zwischenlage einer elastischen Dichtscheibe 14 festlegt. Die durchscheinende Abdeckhaube 13 überdeckt eine zum Beispiel in den Farben rot, grün, blau, gelb etc. ausgeführte Linse 15, die wiederum einen hier als Leuchtelement 16 ausgeführten Meldeteil überdeckt.The device head 1 shown in Fig. 1 is releasably attached to the front wall 2 of a cabinet or the like without special tools. The device head has an insert body 3 which penetrates a hole 4 in the wall 2. The insert body has a shoulder 5 which is supported on the outside 6 of the wall 2 with the interposition of a rubber-elastic seal 7. A fastening nut 9, which is mounted on a threaded part 10 of the insert body 3, is screwed against the inside 8 of the wall 2. Outside, the device head 1 also has a front ring 11 which is screwably mounted on a thread 12 formed on the shoulder 5 of the insert body 3 in the direction toward the outside 6 of the wall 2 and thereby overlaps a translucent cover 13 on its circumference and against the insert body 3 sets with the interposition of an elastic sealing washer 14. The translucent cover 13 covers a lens 15, for example in the colors red, green, blue, yellow, etc., which in turn covers a signaling part designed here as a lighting element 16.

Das Leuchtelement 16 ist im Bereich eines Reflektors 17 angeordnet, der beim vorliegenden Ausführungsbeispiel vorzugsweise aus Kunststoff besteht und dessen Reflektorfläche weiß ist. Es kann auch günstig sein, den Reflektor 17 mit einer metallischen Reflektionsschicht zu versehen, die zum Beispiel durch Metallisierung im Hochvakuum (Metallaufdampfung) hergestellt werden kann. Das Leuchtelement (16) ist hier insbesondere vorteilhaft als optoelektronisches CERLED-Leichtteil ausgeführt, indem auf einer Trägerplatte 18 vorzugsweise sechs bis acht CERLED-Bauteile 19 angeordnet sind, wobei es auch im Rahmen der Erfindung liegt, auf der Trägerplatte weniger, zum Beispiel drei oder vier, oder auch mehr, zum Beispiel fünfzehn, CERLED-Bauteile 19 anzuordnen. Die CERLED-Bauteile bestehen im wesentlichen aus einem kleinen Keramikträger, auf den ein LED-Chip aufgebracht ist. Der Keramikträger des CERLED-Bauteils 19 kann zweckmäßig auf vier Seiten (Oberfläche, Unterseite und beide Stirnseiten) mit einer leitenden Beschichtung versehen sein. Der Keramikträger, dessen Abmessungen zum Beispiel etwa 3,2 mal 1,27 mal 0,6 Millimeter betragen können, erhält auf der Oberseite einen LED-Chip aufgebondet. Über dem LED-Chip ist eine glasklare Plastiklinse von etwa 0,6 Millimeter Höhe angeordnet, die den LED-Chip auf der Oberseite des Keramikträgers umfassend sohützt. Dieser Baustein beziehungsweise CERLED-Bauteil 19 kann mit seiner leitenden Unterseite und/oder mit den leitenden Stirnseiten auf der Trägerplatte 18 an entsprechenden Leiterbahnen befestigt werden. Es ist auch möglich, einzelne Leuchtteile direkt auf einer größeren Keramikleiterplatte aufzubringen, so daß damit eine CERLED-Leuchteinheit gebildet ist. Das Leuchtelement 16 kann auch eine oder mehrere Glimmlampen, Glühlampen, Glühfäden, Leuchtdioden und dergleichen aufweisen. Das gesamte Leuchtelement 16 ist in dem Reflektor 17 in einem Vergußteil 20 eingebettet, das lichtdurchlässig ist, so daß das vom Leuchtelement 16 abgestrahlte Licht durch den Vergußteil 20, die Linse 15 und die Abdeckhaube 13 nach außen strahlen kann.The luminous element 16 is arranged in the region of a reflector 17, which in the present exemplary embodiment is preferably made of plastic and whose reflector surface is white. It may also be expedient to provide the reflector 17 with a metallic reflection layer, which can be produced, for example, by metallization in a high vacuum (metal vapor deposition). The lighting element (16) is particularly advantageous here as an optoelectronic CERLED lightweight part executed by preferably six to eight CERLED components 19 are arranged on a carrier plate 18, it also being within the scope of the invention, less, for example three or four, or more, for example fifteen, CERLED on the carrier plate - Arrange components 19. The CERLED components essentially consist of a small ceramic carrier on which an LED chip is attached. The ceramic carrier of the CERLED component 19 can expediently be provided with a conductive coating on four sides (surface, underside and both end faces). The ceramic carrier, the dimensions of which can be, for example, about 3.2 by 1.27 by 0.6 millimeters, is bonded on the top with an LED chip. A crystal-clear plastic lens about 0.6 millimeters high is arranged above the LED chip, which comprehensively protects the LED chip on the top of the ceramic carrier. This module or CERLED component 19 can be attached to corresponding conductor tracks with its conductive underside and / or with the conductive end faces on the carrier plate 18. It is also possible to apply individual lighting parts directly to a larger ceramic circuit board, so that a CERLED lighting unit is thus formed. The lighting element 16 can also have one or more glow lamps, incandescent lamps, filaments, light-emitting diodes and the like. The entire light-emitting element 16 is embedded in the reflector 17 in a casting part 20 which is translucent, so that the light emitted by the lighting element 16 can radiate through the casting part 20, the lens 15 and the cover 13 to the outside.

Der Reflektor 17 ist einem Leuchtengehäuse 21 zugehörig, dessen Grundwandung 22 von einem Kontaktbolzen 23 durchsetzt ist, der unten aus dem Einsatzkörper 3 herausragt. Der Kontaktbolzen 23 besitzt einen inneren Axialleiter 24, von dem ein Verbindungsleiter 25 zum Leuchtelement 16 geführt ist. Der Axialleiter 24 befindet sich in einer rohrförmigen Isolierhülse 26, die etwas kürzer ausgebildet ist als der Axialleiter 24, so daß ein oberes Anschlußende für den Verbindungsleiter 25 und ein unterer Kontaktteil an den gegenüberliegenden Stirnseiten der Isolierhülse 26 herausragen. Die Isolierhülse 26 ist wiederum von einem metallischen Hülsenleiter 27 umgeben, der etwas kürzer ist als die Isolierhülse 26, so daß letztere an beiden Stirnseiten aus dem Hülsenleiter 27 herausragt. Der Hülsenleiter 27 weist einen Bund 28 auf, der im Leuchtengehäuse 21 an der Innenfläche der Grundwandung 22 abstützend anliegt. Am Bund 28 ist ein weiterer Verbindungsleiter 29 vorzugzweise mittels Lötverbindung angeschlossen, der ebenfalls zum Leuchtelement 16 geführt ist.The reflector 17 is associated with a luminaire housing 21, the base wall 22 of which is penetrated by a contact bolt 23 which projects out of the insert body 3 at the bottom. The contact pin 23 has an inner axial conductor 24, from which a connecting conductor 25 is guided to the lighting element 16. The axial conductor 24 is located in a tubular insulating sleeve 26 which is somewhat shorter than the axial conductor 24, so that an upper connection end for the connecting conductor 25 and a lower contact part protrude on the opposite end faces of the insulating sleeve 26. The insulating sleeve 26 is in turn surrounded by a metallic sleeve conductor 27, which is somewhat shorter than the insulating sleeve 26, so that the latter protrudes from the sleeve conductor 27 on both ends. The sleeve conductor 27 has a collar 28 which rests in the lamp housing 21 on the inner surface of the base wall 22 for support. A further connecting conductor 29 is preferably connected to the collar 28 by means of a solder connection, which is also led to the lighting element 16.

Dem Gerätekopf 1 ist ein Gehäuse 30 zugehörig, wie es im wesentlichen in den Fig. 2 und 3 dargestellt ist. Der Gerätekopf 1 ist dabei an dem Gehäuse 30 lösbar befestigt beziehungsweise mit dem Gehäuse 30 lösbar gekuppelt, so daß im Kupplungszustand ein komplettes Meldegerät 31 gegeben ist. Der Kontaktbolzen 23 des Gerätekopfes 1 befindet sich dabei in einer Rohrfassung 32 des Gehäuses 30. Die Rohrfassung 32 und der in diese eingesteckte Kontaktbolzen 23 bilden gemeinsam einen Zuführungsteil 33 für die Spannungszuführung zum Meldeteil beziehungsweise Leuchtelement 16.A housing 30 is associated with the device head 1, as is shown essentially in FIGS. 2 and 3. The device head 1 is releasably attached to the housing 30 or detachably coupled to the housing 30, so that a complete signaling device 31 is provided in the coupling state. The contact pin 23 of the device head 1 is located in a pipe socket 32 of the housing 30. The pipe socket 32 and the contact pin 23 inserted therein together form a supply part 33 for the voltage supply to the signaling part or lighting element 16.

Die Rohrfassung 32 besitzt an dem dem Gerätekopf 1 zugewandten freien Innenrandbereich eine Einführschräge 34 für den Kontaktbolzen 23. Am anderen Ende der Rohrfassung 32 ist ein Stirnflansch 35 ausgebildet, der sich an einer Innenfläche des Gehäuses 30 abstützt. Außerdem ist im Bereich des Stirnflansches 35 ein Verschlußdekkel 36 angeordnet, der die Rohrfassung 32 an ihrem unteren Endbereich verschließt. Der Verschlußdeckel 36 besitzt an seiner dem Innenraum der Rohrfassung 32 zugewandten Seite eine Mulde 37, in die das aus dem Gerätekopf 1 herausragende freie Stirnende des Kontaktbolzens 23 beziehungsweise des Auxialleiters 24 eindringen kann.The pipe socket 32 has an insertion bevel 34 for the contact bolt 23 on the free inner edge area facing the device head 1. At the other end of the pipe socket 32, an end flange 35 is formed which is supported on an inner surface of the housing 30. In addition, a closure cap 36 is arranged in the region of the end flange 35, which closes the pipe socket 32 at its lower end region. The closure cover 36 has on its side facing the interior of the pipe socket 32 a trough 37 into which the free end of the contact bolt 23 or the auxiliary conductor 24 protruding from the device head 1 can penetrate.

An der Innenfläche der Rohrfassung 32 sind zwei elektrisch leitende Grundstege 38, 38' angeordnet, die einander diametral gegenüberliegen und sich in Längsrichtung der Rohrfassung 32 erstrecken.On the inner surface of the pipe socket 32, two electrically conductive base webs 38, 38 ′ are arranged, which are diametrically opposite one another and extend in the longitudinal direction of the pipe socket 32.

Die Grundstege 38, 38' sind an ihren in Richtung zum Gehäusekopf 1 weisenden freien Enden von nach innen überstehenden Wandungsteilen 39 der Rohrfassung 32 übergriffen, wodurch ein fester Halt der Grundstege 38, 38' in der Rohrfassung 32 sichergestellt ist. Der Grundsteg 38 ist etwas kürzer ausgebildet als der gegenüberliegende Grundsteg 38'. Am Grundsteg 38 befindet sich eine materialeinheitlich angeformte Kontaktfeder 40, während am Grundsteg 38' eine weitere Kontaktfeder 40' ausgebildet ist. Die Kontaktfedern 40, 40' sind schräg nach innen in Richtung zur Achsmitte und zum Verschlußdeckel 36 der Rohrfassung 32 gerichtet, so daß der Kontaktbolzen 23 des Gerätekopfes 1 behinderungsfrei in die Rohrfassung 32 eingesteckt werden kann und eine bleibende Verbiegung der Kontaktfedern 40, 40' vermieden ist. Die Kontaktfedern 40, 40' besitzen an ihren freien Enden entsprechende Kontaktkuppen, wobei die Kontaktkuppe der Kontaktfeder 40 am freien Stirnendbereich des Axialleiters 24 und die Kontaktkuppe der anderen Kontaktfeder 40' an der Außenfläche des Hülsenleiters 27 anliegt. An den Grundstegen 38, 38' sind Leiteranschlüsse 41, 41' ausgebildet, die beim vorliegenden Ausführungsbeispiel im Bereich des Verschlußdeckels 36 rechtwinklig in entgegengesetzten Richtungen aus der Rohrfassung 32 heraus nach außen geführt sind. An den Leiteranschlüssen 41,41' sind Verbindungen 42, 42" angeschlossen, die zu einer Elektronik-Leiterplatte 43 führen.The base webs 38, 38 'are overlapped at their free ends pointing in the direction of the housing head 1 by inwardly projecting wall parts 39 of the tube mount 32, thereby ensuring that the base webs 38, 38' are firmly held in the tube mount 32. The base web 38 is somewhat shorter than the opposite base web 38 '. A contact spring 40 formed integrally with the material is located on the base web 38, while a further contact spring 40 'is formed on the base web 38'. The contact springs 40, 40 'are directed obliquely inwards towards the center of the axis and the closure cover 36 of the pipe socket 32, so that the contact bolt 23 of the device head 1 can be inserted into the pipe socket 32 without hindrance and a permanent bending of the contact springs 40, 40' is avoided is. The contact springs 40, 40 'have corresponding contact tips at their free ends, the contact tip of the contact spring 40 resting on the free end region of the axial conductor 24 and the contact tip of the other contact spring 40' resting on the outer surface of the sleeve conductor 27. Conductor connections 41, 41 'are formed on the base webs 38, 38' and, in the present exemplary embodiment, in the region of the closure cover 36 are guided outwards at right angles in opposite directions out of the pipe socket 32. Connections 42, 42 ″, which lead to an electronic circuit board 43, are connected to the conductor connections 41, 41 ′.

Die Rohrfassung 32 ist an ihrem Außenumfang von einem Druckstück 44 umgeben, das an der Rohrfassung 32 in dessen Längsrichtung axial verschiebbar geführt ist. Das Druckstück 44 ist federbelastet, indem eine schraubenförmige Druckfeder 45, die die Rohrfassung 32 ebenfalls umgibt, mit ihrem einen Ende am Gehäuse 30 abgestützt ist und mit ihrem anderen Ende in eine Ringnut des Druckstücks 44 eingreift und letzteres nach oben in Richtung zum Gerätekopf 1 drückt. Oben weist das Gehäuse 30 einen in etwa haubenförmigen Halterahmen 46 auf, der mit dem Gehäuse 30 mittels einer lösbaren Rast- beziehungsweise Klipsarretierung verbunden ist. An der dem Gerätekopf 1 zugewandten oberen Seite des Halterahmens 46 ist ein Federbügel 47 vorgesehen, der die lösbare Kupplung zwischen dem Gerätekopf 1 und dem Gehäuse 30 bewirkt.The pipe socket 32 is surrounded on its outer circumference by a pressure piece 44 which is guided axially displaceably on the pipe socket 32 in its longitudinal direction. The pressure piece 44 is spring-loaded in that a helical compression spring 45, which also surrounds the pipe socket 32, is supported at one end on the housing 30 and at the other end in a Ring groove of the pressure piece 44 engages and the latter pushes upwards towards the device head 1. At the top, the housing 30 has an approximately hood-shaped holding frame 46, which is connected to the housing 30 by means of a releasable locking or clip lock. On the upper side of the holding frame 46 facing the device head 1, a spring clip 47 is provided, which effects the releasable coupling between the device head 1 and the housing 30.

Unter der Rohrfassung 32 befindet sich etwa im mittleren Bereich des Gehäuses 30 ein explosionsgeschützter druckfester Raum 48. In diesem druckfesten Raum 48 sind mindestens ein hier nicht sichtbarer Spannungsbegrenzer und ein Strombegrenzer gelagert, wodurch die dem Leuchtelement 16 im Gerätekopf 1 zugeführte Spannung entsprechend der Explosionsschutz-Eigensicherheit (EN 50020) auf maximal 18 V und der hier höchstzulässig fließende Strom auf maximal 30 mA begrenzt sind. Damit ist mit einfachen Mitteln eine hohe Explosionsschutzsicherheit gegeben, ohne daß der Gerätekopf 1 einer besonderen Kapselung und Spezialbefestigung unterliegt, sondern statt dessen jederzeit gefahrlos vom Gehäuse getrennt werden kann, ohne daß die Spannung abgeschaltet werden muß und andere Sicherheitsvorkehrungen zu treffen sind. Der Gerätekopf 1 mit dem Meldeteil 16 und dem Zuführungsteil 33 ist somit ansgehend von den Ausgängen der vorgeschalteten Spannungs- und Strombegrenzer im druckfesten Raum 48 erfindungsgemäß als Explosionsschutz-Eigensicherheitseinheit 49 ausgebildet.An explosion-proof, pressure-resistant space 48 is located under the pipe socket 32, approximately in the central region of the housing 30. At least one voltage limiter and a current limiter (not visible here) are stored in this pressure-proof space 48, so that the voltage supplied to the lighting element 16 in the device head 1 corresponds to the explosion protection Intrinsic safety (EN 50020) is limited to a maximum of 18 V and the maximum permissible current flowing here is limited to a maximum of 30 mA. This provides a high level of explosion protection with simple means, without the device head 1 being subject to a special encapsulation and special fastening, but instead being able to be safely disconnected from the housing at any time without the voltage having to be switched off and other safety precautions being taken. The device head 1 with the signaling part 16 and the feed part 33 is thus designed as an explosion protection intrinsic safety unit 49, starting from the outputs of the upstream voltage and current limiters in the pressure-resistant space 48.

Der Spannungsbegrenzer im druckfesten Raum 48 des Gehäuses 30 kann vorteilhaft aus zwei parallel geschalteten Zenerdioden gebildet sein, während der Strombegrenzer aus einem entsprechend bemessenen Widerstand bestehen kann. Anstelle des Widerstandes kann jedoch auch ein elektronischer Strombegrenzer vorgesehen werden.The voltage limiter in the pressure-resistant space 48 of the housing 30 can advantageously be formed from two Zener diodes connected in parallel, while the current limiter can consist of an appropriately dimensioned resistor. Instead of the resistor, however, an electronic current limiter can also be provided.

Der Spannungsbegrenzer und der Strombegrenzer sind zweckmäßig auf der Elektronik-Leiterplatte 43 im druckfesten Raum 48 angeordnet. Auf dieser Elektronik-Leiterplatte 43 kann zudem ein Transformator 50 im druckfesten Raum 48 angeordnet sein, der zum Beispiel eine dem Meldegerät 31 zugeführte höhere Spannung auf die dem Meldeteil 16 zugeführte Betriebsspannung herabtransformiert. Dazu kann ein Gleichrichter 51 auf der Elektronik-Leiterplatte 43 angeordnet sein, über den eine eingeleitete Wechselspannung für den Betrieb des Leuchtelements 16 gleichgerichtet wird. Außerdem kann es zweckmäßig sein, auf der Elektronik-Leiterplatte 43 eine Elektrosicherung 53 vorzusehen, die vorzugsweise als Schmelzsicherung ausgeführt sein kann.The voltage limiter and the current limiter are expediently arranged on the electronic circuit board 43 in the pressure-resistant space 48. On this electronic circuit board 43, a transformer 50 can also be arranged in the pressure-proof space 48, which, for example, transforms a higher voltage supplied to the signaling device 31 down to the operating voltage supplied to the signaling part 16. For this purpose, a rectifier 51 can be arranged on the electronic circuit board 43, via which an AC voltage introduced is rectified for the operation of the lighting element 16. In addition, it can be expedient to provide an electronic fuse 53 on the electronic circuit board 43, which can preferably be designed as a fuse.

Zur druckfesten Kapselung der vorbeschriebenen Teile im Gehäuse 30 sind der Spannungsbegrenzer, der Strombegrenzer, die Elektronik-Leiterplatte 43, der Transformator 50, der Gleichrichter51, die Elektrosicherung 52 und die Verbindungen 42, 42' von einem Gießharz 53 umschlossen, so daß ein sicherer Vergußabschluß gegen eine Explosionsgefahr gegeben ist. Als Gießharz kann zweckmäßig ein Expoxidharz oder auch ein Polyurethan vorgesehen werden. Darüber hinaus kann es günstig sein, das Gießharz 53 so einzustellen beziehungsweise derart verschiedene Ausführungen zu wählen, daß die im druckfesten Raum 48 gelagerten Teile, wie Spannungsbegrenzer, Strombegrenzer, Leiterplatte 43, Transformator 50, Gleichrichter 51 und Elektrosicherung 52, unmittelbar von einem elastischen, nachgiebigen Wandungsbereich des Gießharzes 53 oder dergleichen umschlossen sind und daß anschließend an diesen elastischen Wandungsbereich der eigentliche feste Gießharzverguß ausgebildet ist. Durch den elastischen Wandungsbereich wird eine hohe Gebrauchstüchtigkeit auch bei extremen Beanspruchungen, wie zum Beispiel bei Schwingungen und schwankenden Temperaturintervallen, erzielt, so daß in jedem Falle eine hohe Dauerfunktionstüchtigkeit gegeben ist.For the pressure-resistant encapsulation of the above-described parts in the housing 30, the voltage limiter, the current limiter, the electronic circuit board 43, the transformer 50, the rectifier 51, the electrical fuse 52 and the connections 42, 42 'are enclosed by a casting resin 53, so that a secure sealing seal against an explosion hazard. An epoxy resin or a polyurethane can expediently be provided as the casting resin. In addition, it may be expedient to set the casting resin 53 or to select different designs in such a way that the parts stored in the pressure-resistant space 48, such as voltage limiters, current limiters, circuit board 43, transformer 50, rectifier 51 and electrical fuse 52, directly from an elastic, flexible wall area of the casting resin 53 or the like are enclosed and that the actual solid casting resin potting is subsequently formed on this elastic wall area. Due to the elastic wall area, a high level of serviceability is achieved even under extreme loads, such as vibrations and fluctuating temperature intervals, so that a high degree of long-term functionality is ensured in any case.

Über dem druckfesten Raum 48 ist beim vorliegenden Ausführungsbeispiel rechts neben der Rohrfassung 32 eine Rasteinrichtung 54 angeordnet, die für einen Schalthebel mittels entsprechender Kulissenführung zwei Schaltarretierungen besitzt. Die Rasteinrichtung 54 ist dem Druckstück 44 zugeordnet und wird durch dieses betätigt. Zudem wird über das Druckstück 44 ein Hubausgleichsteil 55 betätigt, das einen Topfbolzen 56 aufweist, in dem eine schraubenförmige Ausgleichsfeder 57 gelagert ist. Das Hubausgleichsteil 55 ist oben vom Halterahmen 46 überdeckt. Unter der Grundwand 58 des Topfbolzens 56 befindet sich ein Stößel 59, der in einer zylindrischen, explosionssicheren Spaltdurchführung 60 die Wandung 61 axial verschiebbar durchsetzt und in eine explosionsgeschützt druckfest gekapselte Kammer 62 hineinragt. Diese Kammer 62 befindet sich in der gezeigten Darstellung rechts neben dem druckfesten Raum 48 beziehungsweise neben der Elektrosicherung 52. In der druckfesten Kammer 62 ist ein Mikroschalter 63 gelagert, gegen dessen Schalstift 64 der Stößel 59 wirkt. Für bestimmte Schaltfunktionen kann es günstig sein, zwei Mikroschalter in der Kammer 62 anzuordnen. Die druckfeste Kammer 62 ist ebenso wie der druckfeste Raum 48 mit einem Gießharz 53 explosionsgeschützt vergossen.In the present exemplary embodiment, a latching device 54 is arranged above the pressure-proof space 48 to the right of the pipe socket 32, which has two switching locks for a shift lever by means of a corresponding link guide. The locking device 54 is assigned to the pressure piece 44 and is actuated by this. In addition, a stroke compensation part 55 is actuated via the pressure piece 44, which has a pot bolt 56 in which a helical compensation spring 57 is mounted. The stroke compensation part 55 is covered at the top by the holding frame 46. Under the base wall 58 of the pot bolt 56 there is a plunger 59 which penetrates the wall 61 in an axially displaceable manner in a cylindrical, explosion-proof gap passage 60 and projects into an explosion-proof, pressure-tightly encapsulated chamber 62. In the illustration shown, this chamber 62 is located to the right of the pressure-proof space 48 or next to the electrical fuse 52. A microswitch 63 is mounted in the pressure-proof chamber 62, and the plunger 59 acts against the switching pin 64 thereof. For certain switching functions, it may be expedient to arrange two microswitches in the chamber 62. The pressure-resistant chamber 62, like the pressure-resistant space 48, is encapsulated with explosion-proof casting resin 53.

Bei dem in der Fig. 2 dargestellten Ausführungsbeispiel ist im Bereich unter dem druckfesten Raum 48 das Ende einer Schlauchleitung 65 im Gießharz 53 eingegossen. Die Schlauchleitung 65 besitzt Einzelleiter 66, die den entsprechenden elektrischen Funktionsteilen im Gehäuse 30 zugehörig sind. Es besteht auch die Möglichkeit, auch nur eine einzige oder mehrere Einzelleitungen, die also nicht zu einer Schlauchleitung zusammengefasst sind, unten im Gehäuse 30' einzugie- ßen. Es ist zwar grundsätzlich möglich, das in der Fig. 2 dargestellte Gehäuse 30 mit dem darüber dargestellten Gerätekopf 1 der Fig. 1 zu keppeln, doch ist dieses nicht ganz zweckmäßig, da der Gerätekopf gemäß der Fig. 1 als reine Meldeleuchte ausgeführt ist, so daß hierfür kein Mikroschalter und auch kein Hubausgleichsteil sowie keine Rasteinrichtung erforderlich sind. In die freien Räume, insbesondere in die druckfeste Kammer 62, kann vorteilhaft ein weiteres elektrisches Bauelement für eine weitere Funktion eingesetzt werden. Es kann auch vorteilhaft sein, die zugeführte Spannung gleich in der richtigen Höhe (18 V) zuzuführen, so daß der Transformator 50 im druckfesten Raum 48 eingespart werden kann. Der sich dadurch ergebende freie Raum kann in diesem Falle vorteilhaft für andere Teile, wie zum Beispiel elektronische Bauelemente (Steuerelemente, Relais, Mikroprozessor etc.) genutzt werden. Dadurch sind weitere zweckmäßige Anwendungsmöglichkeiten für das erfindungsgemäße Meldegerät 31 gegeben.In the embodiment shown in FIG. 2, the end of a hose line 65 is cast in the casting resin 53 in the area under the pressure-resistant space 48. The hose line 65 has individual conductors 66 which are associated with the corresponding electrical functional parts in the housing 30. There is also the possibility of pouring even one or more individual lines, which are therefore not combined to form a hose line, into the bottom of the housing 30 '. Although it is possible in principle to cull the housing 30 shown in FIG. 2 with the device head 1 of FIG. 1 shown above, this is not entirely expedient since the device head according to FIG. 1 is a mere message is carried out light, so that no microswitch and no stroke compensation part and no locking device are required. A further electrical component for a further function can advantageously be used in the free spaces, in particular in the pressure-resistant chamber 62. It can also be advantageous to supply the supplied voltage at the correct level (18 V) so that the transformer 50 in the pressure-resistant space 48 can be saved. In this case, the resulting free space can be used advantageously for other parts, such as electronic components (control elements, relays, microprocessors, etc.). This provides further expedient possible uses for the signaling device 31 according to the invention.

Bei dem in der Fig. 3 dargestellten Ausführungsbeispiel weist im Unterschied zum Gehäuse 30 der Fig. 2 das Gehäuse 30' Leitungsklemmen 67 auf, denen Leiterteile 68 zugehörig sind, die im Gießharz 53 eingebettet sind. Hier ist also keine Schlauchleitung vorgesehen, sondern das Gehäuse 30' kann an Stromschienen oder dergleichen angeschlossen werden.In the exemplary embodiment shown in FIG. 3, in contrast to the housing 30 of FIG. 2, the housing 30 'has line terminals 67, to which conductor parts 68 are associated, which are embedded in the casting resin 53. No hose line is provided here, but the housing 30 'can be connected to busbars or the like.

Bei dem in der Fig. 3 dargestellten Ausführungsbeispiel weist das erfindungsgemäße Meldegerät 31 zudem einen Gerätekopf 1' auf, der als explosionsgeschüzter Leuchttaster, Schaltleuchteinheit beziehungsweise Leuchtschaltervorsatz ansgebildet ist. Dazu ist das Leuchtengehäuse 21, in dem das Leuchtelement 16 gelagert ist, etwas anders gestaltet. Außerdem ist die Linse 15' von einer gummielastischen Manschette 69 umgeben und an einem Drucktaster 70 gelagert, der in Richtung gegen das Gehäuse 30' im Gerätekopf 1' axial verschiebbar ist. Dem Drucktaster 70 ist im Einsatzkörper 3 eine Druckhülse 71 zugeordnet. Diese Druckhülse 71 weist eine Schraubenfeder 72 auf und wirkt bei Betätigung des Drucktasters 70 gegen das die Rohrfassung 32 umgebende Druckstück 40, durch das der Schaltungshub über die Rasteinrichtung 54, das Hubausgleichsteil 55 und den Stößel 59 auf den beziehungsweise die Mikroschalter 63 übertragen wird. Es ist demnach bei diesem Ausführungsbeispiel ein Druckschalter-Meldegerät verwirklicht, das zur Anzeige ein Leuchtelement 16 im Drucktaster 70 besitzt, wobei der Zuführungsteil zum Gerätekopf 1' und dieser selbst in vollem Umfang explosionsgeschützt eingensicher sind, so daß keine zusätzlichen Sicherheitsvorkehrungen notwendig sind. Konkret ist hier der Gerätekopf 1' mit dem Leuchtelement 16 und dem Drucktaster 70 insbesondere als explosionsgeschützte Schaltleuchteinheit ausgebildet, die auch unabhängig von dem Erfindungsvorschlag bereits für sich allein betrachtet den besonderen Vorteil aufweist, daß ein Schalter beziehungsweise Taster und eine Leuchteinheit zu einer einzigen Baueinheit integriert sind, die explosionsgeschützt ist. Eine derartige Explosionsschutz-Schaltleuchteinheit ist bisher nicht bekannt.In the exemplary embodiment shown in FIG. 3, the signaling device 31 according to the invention also has a device head 1 'which is designed as an explosion-protected illuminated pushbutton, switching light unit or light switch attachment. For this purpose, the lamp housing 21, in which the lighting element 16 is mounted, is designed somewhat differently. In addition, the lens 15 'is surrounded by a rubber-elastic sleeve 69 and mounted on a push button 70 which is axially displaceable in the direction against the housing 30' in the device head 1 '. A pressure sleeve 71 is assigned to the pushbutton 70 in the insert body 3. This pressure sleeve 71 has a helical spring 72 and acts upon actuation of the push button 70 against the pressure piece 40 surrounding the pipe socket 32, through which the switching stroke is transmitted via the latching device 54, the stroke compensation part 55 and the plunger 59 to the microswitch 63. It is therefore realized in this embodiment, a pressure switch signaling device, which has a light element 16 in the push button 70 for display, the feed part to the device head 1 'and this itself being fully explosion-proof, so that no additional safety precautions are necessary. Specifically, here the device head 1 'with the lighting element 16 and the push button 70 is designed in particular as an explosion-protected switching light unit, which, independently of the proposed invention, already has the particular advantage in itself that a switch or button and a light unit are integrated into a single structural unit are explosion-proof. Such an explosion protection switching light unit is not yet known.

Zur Vermeidung einer unzulässig hohen Übertemperatur an der Außenseite des Gehäuses 30, 30' kann es zweckmäßig sein, im druckfest gekapselten Raum 48 eine Temperatursicherung anzuordnen. Diese gewährleistet, daß eine maximale Außentemperatur von zum Beispiel 80°C in keinem Falle überschritten wird.To avoid an inadmissibly high excess temperature on the outside of the housing 30, 30 ', it may be expedient to arrange a temperature fuse in the pressure-tightly encapsulated space 48. This ensures that a maximum outside temperature of, for example, 80 ° C is never exceeded.

Ein weiteres wesentliches Merkmal der Erfindung besteht darin, daß im Gerätekopf 1, 1' verschiedenfarbige und verschiedenartige Leuchtanzeigen einfach und ohne besondere Sicherheitsvorkehrungen ausgewechselt werden können, so daß entsprechend den jeweiligen Erfordernissen stets eine optimale Funktionsanzeige erzielt werden kann.Another essential feature of the invention is that in the device head 1, 1 'different colored and different types of light displays can be replaced easily and without special safety precautions, so that an optimal function display can always be achieved according to the respective requirements.

Claims (18)

1. Explosion-protected electrical warning device (31), especially indicator light, illuminated push-button, illuminated switch, which can be fixed in a hole (4) of a front panel, with a casing (30, 30') having electrical connections and with an appliance head (1, 1') detachably fixed on the casing, which contains a signalling section (16) supplied with electric voltage, characterised by the following features:
a) the appliance head (1, 1') has an insert body (3) passing through the wall hole (4), fixed on the internal side (8) of the wall (2),
b) outside, a front ring (11) is screwed onto a thread (12) of the insert body (3),
c) the casing (30, 30') is provided on a retaining frame (46) which is detachably fixed with the appliance head (1, 1'),
d) in an explosion-protected encapsulated space (48) of the casing (30, 30'), a voltage limiter and a current limiter are arranged and connected in series to the signalling section (16) in the appliance head (1, 1') via a feeding section (33),
e) the feeding section (33) has a tubular holder (32) arranged on the casing (30, 30'), in which electrical contact springs (40, 40') are arranged, and a contact bolt (23) provided on the appliance head (1, 1') which is supported in the tubular holder (32),
f) the appliance head (1, 1') with the signalling section (16) and the feeding section (13) are designed from the output of the voltage limiter and of the current limiter on as an explosion-protection intrinsic safety unit (49).
2. Warning device according to the above Claim, characterised in that at least one Zener diode as a voltage limiter and one electrical resistance as an electronic current limiter are connected in series to the signalling section (16) in the appliance head (1, 1') and are arranged in the space (48) of the casing (30, 30').
3. Warning device according to one of the above Claims, characterised in that the voltage limiter and the current limiter and also a rectifier (51) connected in series to the signalling section (16) and a transformer (50) arranged before the voltage limiter and the current limiter, and also an electrical fuse (53) are arranged on a printed board (43) in the space (48) of the casing (30,30'), and that between the feeder section (33) of the explosion-protection intrinsic safety unit (49) and the printed board (43), connections (42, 42') are arranged in the space (48) of the casing (30, 30').
4. Warning device according to one of the above Claims, characterised in that the space (48) of the casing (30, 30') at least containing the voltage limiter and the current limiter is enclosed by a casting resin (53) and that the components embedded in the casting resin (53), such as voltage limiter, current limiter, transformer (50), are preferably enclosed by an elastic wall zone of the casting resin (53).
5. Warning device according to one of the above Claims, characterised in that the casing (30, 30') has line terminals (67) with conductor components (68) enclosed in the casting resin (53) near to the space (48) containing the voltage limiter and the current limiter.
6. Warning device according to one of the above Claims, characterised in that, on one underside of the casing (30,30'), an electrical lead (65) debouching into the latter is arranged with at least one strand (66) and is enclosed in the casting resin (53).
7. Warning device according to one of the above Claims, characterised in that a face flange (35) of the tubular holder (32) of the feeder section (33) lies against an inside face of the casing (30, 30') above the space (48), that the tubular holder (32) on the face side turned towards the space (48) of the casing (30, 30') is blocked via a sealing cover (36) and that the sealing cover (36) of the tubular holder (32) has a trough (37) for accepting one front end of the contact bolt (23).
8. Warning device according to one of the above Claims, characterised in that, on the face side of the tubular holder (32) in the zone of the sealing cover (36), conductor connections (41, 41') of the contact springs (40, 40') are led into the zone of the casting resin (53) and that the contact springs (40, 40') going out from the inside face of the tubular holder (32) of the feeder section (33) are directed obliquely inwards towards the sealing cover (36).
9. Warning device according to one of the above Claims, characterised in that basic webs (38, 38') of the contact springs (40, 40') of the feeder section (33) are overlapped by wall sections (39) of the tubular holder (32) and that a lead-in bevel (34) is constructed at the end zone of the tubular holder (32) turned towards the appliance head (1, 1').
10. Warning device according to one of the above Claims, characterised in that the tubular holder (32) of the feeder section (33) is arranged in the zone of a pressure spring (45) acting in the lengthwise direction of the tubular holder (32), one end of which is supported on the casing (30, 30') and the other end of which is supported on a thrust piece (44), which, against the force of the pressure spring (45) in a direction against the casing (30, 30'), is mounted so that it is guided on the latter.
11. Warning device according to one of the above Claims, characterised in that at least one microswitch (63) which can be operated via the thrust piece (44) is arranged in an explosion-protected encapsulated chamber (62) of the casing (30, 30') near to the space (48) containing the voltage limiter and the current limiter.
12. Warning devices according to one of the above Claims, characterised in that, between the thrust piece (44) and the microswitch (63), a stroke-compensating component (55) is arranged, which has a pot-bolt (56) with a positively supported compensating spring (57) in it, that, between a basic wall (58) of the pot-bolt (56) and the microswitch (63), a tappet (69) is arranged in the chamber (62) of the casing (30, 30'), which is guided so that it can be slid axially in an explosion-proof through gap (60) in the wall (61) of the casing (30, 30'), that a notch mechanism (54) with two switch arresting devices is assigned to the thrust piece (44) and that the more or less cowl- shaped retaining frame (46) overlaps the thrust piece (44) with the pressure spring (45) and also the stroke-compensating component (55) and the notch mechanism (54).
13. Warning device according to one of the above Claims, characterised in that the contact bolt (23) of the feeder section (33) has an axial conductor (24) arranged in the insulating sleeve (26), against which lies a contact spring (40) of the tubular holder (32), and has on the insulating sleeve (26) an external sleeve conductor (27), against which the other contact spring (40') lies, and that the contact bolt (23) of the appliance head (1, 1') is arranged with a collar (28) in a lamp casing (21) and that connecting leads (25, 29) are led from the collar (28) and from the axial conductor (24) to the signalling section designed as a lighting element (16).
14. Warning device according to one of the above Claims, characterised in that the lighting element (16) is arranged in a reflector (17) of the lamp casing (21) and is embedded in a translucent encapsulation section (20).
15. Warning device according to any one of the above Claims, characterised in that the lighting element (16) of the appliance head (1, 1') is covered by a preferably colored (red, green) lens (15, 15') and that the appliance head (1) has, above the lighting element (16) and the lens (15), preferably a translucent canopy (13).
16. Warning device according to one of the above Claims, characterised in that the lighting element (16) in the appliance head (1, 1') is designed with a ceramic holder and bonded-on LED chip as a CERLED (19) and is designed with a carrier plate (18) and at least two, preferably about five to twenty, optoelectronic lighting components as a CERLED lighting unit.
17. Warning device according to one of the above Claims, characterised in that the appliance head (1') is designed with the lighting element
(16) and a push-button (70) as an explosion-protected switch light unit and that the external lens (15') of the lighting element (16) is arranged in the push-button (70) which can be shifted axially in the appliance head (1') in a direction towards the casing (30'), a thrust sleeve (71) which can be axially shifted against the force of a coil spring (72) being assigned to the push-button, acting against the thrust piece (44) surrounding the tubular holder (32).
EP84109896A 1983-09-14 1984-08-20 Warning device Expired - Lifetime EP0141099B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84109896T ATE59244T1 (en) 1983-09-14 1984-08-20 REPORTING DEVICE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3333135 1983-09-14
DE19833333135 DE3333135A1 (en) 1983-09-14 1983-09-14 REPORTING DEVICE

Publications (3)

Publication Number Publication Date
EP0141099A2 EP0141099A2 (en) 1985-05-15
EP0141099A3 EP0141099A3 (en) 1987-08-12
EP0141099B1 true EP0141099B1 (en) 1990-12-19

Family

ID=6209031

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84109896A Expired - Lifetime EP0141099B1 (en) 1983-09-14 1984-08-20 Warning device

Country Status (5)

Country Link
US (1) US4600977A (en)
EP (1) EP0141099B1 (en)
JP (1) JPS6095698A (en)
AT (1) ATE59244T1 (en)
DE (2) DE3333135A1 (en)

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Also Published As

Publication number Publication date
JPH0410674B2 (en) 1992-02-26
JPS6095698A (en) 1985-05-29
EP0141099A2 (en) 1985-05-15
ATE59244T1 (en) 1991-01-15
US4600977A (en) 1986-07-15
DE3483773D1 (en) 1991-01-31
DE3333135A1 (en) 1985-03-28
EP0141099A3 (en) 1987-08-12
DE3333135C2 (en) 1989-06-08

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