EP2116763A1 - Inherently safe headlamp - Google Patents

Inherently safe headlamp Download PDF

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Publication number
EP2116763A1
EP2116763A1 EP09005701A EP09005701A EP2116763A1 EP 2116763 A1 EP2116763 A1 EP 2116763A1 EP 09005701 A EP09005701 A EP 09005701A EP 09005701 A EP09005701 A EP 09005701A EP 2116763 A1 EP2116763 A1 EP 2116763A1
Authority
EP
European Patent Office
Prior art keywords
intrinsically safe
led lighting
headlamp
lighting units
housing
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.)
Withdrawn
Application number
EP09005701A
Other languages
German (de)
French (fr)
Inventor
Davoud Shahrokhshahi
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.)
Boesha Technische Produkte GmbH and Co KG
Original Assignee
Boesha Technische Produkte GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Boesha Technische Produkte GmbH and Co KG filed Critical Boesha Technische Produkte GmbH and Co KG
Publication of EP2116763A1 publication Critical patent/EP2116763A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/19—Attachment of light sources or lamp holders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/39—Attachment thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/47—Passive cooling, e.g. using fins, thermal conductive elements or openings
    • F21S45/48—Passive cooling, e.g. using fins, thermal conductive elements or openings with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S45/00—Arrangements within vehicle lighting devices specially adapted for vehicle exteriors, for purposes other than emission or distribution of light
    • F21S45/40—Cooling of lighting devices
    • F21S45/49—Attachment of the cooling means
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • 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
    • F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
    • F21V29/50—Cooling arrangements
    • F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
    • F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
    • F21V29/76—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section
    • F21V29/763—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical parallel planar fins or blades, e.g. with comb-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
    • 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
    • F21W2131/00—Use or application of lighting devices or systems not provided for in codes F21W2102/00-F21W2121/00
    • F21W2131/40—Lighting for industrial, commercial, recreational or military use
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2113/00—Combination of light sources
    • F21Y2113/10—Combination of light sources of different colours
    • F21Y2113/13—Combination of light sources of different colours comprising an assembly of point-like light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the present invention relates to an intrinsically safe headlamp which is suitable and adapted for operation in potentially explosive atmospheres.
  • Intrinsically safe electrical equipment that is suitable and suitable for operation in potentially explosive atmospheres are already known from the prior art in numerous different embodiments. Electrical equipment is considered to be intrinsically safe if the energy in its circuits is kept low enough to prevent the generation of a spark or thermal effect that can cause an explosive atmosphere to explode (European Standard "Intrinsic Safety”: EN 60079-11: 2007) , To achieve the intrinsic safety of an electrical device, for example, special power supply devices are installed, which have a particularly high internal resistance. Intrinsically safe headlights are also known in the art. Such lights have during operation, however, only a relatively low light output. In addition, the lamps of the known from the prior art intrinsically safe headlight on a comparatively short life.
  • the present invention has for its object to provide an intrinsically safe> headlamp of the type mentioned, which achieves a high luminous efficacy in operation.
  • the intrinsically safe headlamp according to the invention which is suitable and adapted for operation in potentially explosive atmospheres, can be used, for example, in rail vehicles (especially in diesel and battery packs, in diesel, trolley and battery locomotives), in drum skid steer loaders, electrically operated shovel loaders, section tunneling machines (partial section) - and full-cut machines), local stages or the like are installed.
  • Another field of application of the intrinsically safe headlamp according to the invention is the illumination of objects which are monitored, for example, by means of a camera.
  • An advantage of the solution presented here is that with the help of light-emitting diodes, which are preferably so-called high-performance light-emitting diodes, a high luminous efficacy during operation of the intrinsically safe Headlamps can be achieved.
  • both the housing and the housing cover may be substantially cylindrically shaped.
  • the transparent pane which terminates the intrinsically safe headlight on the end and through which the light emitted by the LED lighting device can be transmitted during operation, preferably consists of a safety glass.
  • the LED lighting units can be individually switched on or off in groups.
  • each of the LED lighting units has a reflector.
  • each of the LED lighting units has at least one lens.
  • the reflectors and / or the lenses of the LED lighting units are designed to be interchangeable. Due to the interchangeable lenses and / or the exchangeable reflectors, the beam angle of the LED lighting units can be specifically adapted. Depending on the intended use, by a suitable choice of the lenses and / or the reflectors of the LED lighting units beam angle between about 5 ° and about 80 ° can be achieved.
  • the LED lighting units are attached to a light unit holder.
  • the light unit holder which may in particular be substantially disc-shaped, may be pre-equipped, for example, with the LED light units. So that the LED lighting units do not fail even with relatively strong, long-lasting vibrations, the LED lighting units are preferably mounted vibration-proof on the light unit holder. As a result, the reliability of the intrinsically safe headlamp can be increased.
  • a heat sink is attached to the light unit holder.
  • a single heat sink is provided for all the LED lighting units.
  • a plurality of heat sinks are provided, each of which is associated with at least one of the LED lighting units. If appropriate, a heat sink may also be assigned a plurality of LED lighting units.
  • the light unit holder is attached to a mounting plate.
  • the mounting plate is preferably arranged in the housing.
  • the at least one intrinsically safe Power supply device which is preferably a constant current source, is arranged on the mounting plate.
  • the at least one power supply device may be potted in a particularly advantageous embodiment with the mounting plate.
  • the at least one power supply device is first mounted on the mounting plate. Subsequently, a potting compound is applied and so shed the at least one power supply device to the mounting plate.
  • the intrinsically safe headlight can also have a number of intrinsically safe power supply devices (constant current sources), which are preferably attached to the mounting plate.
  • a particularly advantageous embodiment provides that a reflector is arranged on an inner wall of the housing cover.
  • At least one intrinsically safe electrical connection element is arranged on the housing, to which an electrical connection cable can be connected.
  • the electrical connection element may be, for example, an intrinsically safe connector.
  • the intrinsically safe headlamp comprises at least one flasher unit which is coupled at least to some of the LED lighting units.
  • the flasher is attached to the mounting plate.
  • the flasher unit may be potted with the mounting plate, for example.
  • the blinking frequency can be over Trim potentiometer, which is also housed in the housing of the intrinsically safe headlight, can be adjusted.
  • the light-emitting diodes of the LED light units can in particular have the colors white, green, red or blue.
  • all the color combinations listed above are possible, so that at least some of the LED lighting units can have different colors.
  • the LED lighting units are designed and switchable such that the intrinsically safe headlight has a low beam and a high beam function. When the high beam function is activated, areas at greater distances from the intrinsically safe headlight can also be illuminated.
  • the at least one power supply device is designed such that it can be operated with a supply voltage of 12.5 V (-10%,..., + 200%) DC and a total current of 1.5 A. is.
  • the LED lighting units have at least one light-emitting diode that can emit light in the red spectral range.
  • this group of LED lighting units whose light emitting diodes each emit light in the red spectral range, separately from the other LED lighting units switched on and off and thus activated and deactivated again, so that the intrinsically safe headlamp has a reversing light function or a brake light function.
  • the intrinsically safe headlamp can thus have a dipped-beam function, a high-beam function and a reversing light function (and possibly an additional brake light function), between which it is possible to switch between.
  • FIG. 1 showing an exploded view of an intrinsically safe headlamp 1 according to a preferred embodiment of the present invention.
  • the intrinsically safe headlight 1 comprises a substantially cylindrical housing 2, which defines a receiving space 20, and a corresponding, also substantially cylindrically shaped housing cover 3.
  • the housing 2 and the housing cover 3 are made of a metallic material, thereby the necessary To achieve stability.
  • the housing cover 3 is closed on one side by means of a transparent safety glass pane 31.
  • a reflector 32 is further arranged on an inner wall of the housing cover 3.
  • the housing cover 3 can be screwed to the housing 2 by means of a plurality of mounting screws 4, which engage in suitable mounting openings 5, which are provided on an outer wall of the housing 2 and each have an internal thread.
  • a total of three mounting screws 4 and three corresponding, provided with an internal thread mounting holes 5 are provided which are equidistantly distributed over the outer circumference of the housing cover 3 and the housing 2, so that the housing cover 3 via three attachment points securely on the housing. 2 can be attached.
  • the housing 2 and the housing cover 3 are made relatively compact in the assembled state, so that the operation of the intrinsically safe headlamp. 1 even with a comparatively limited, for the attachment of the intrinsically safe headlight 1 available space is possible.
  • the housing 2 in the embodiment shown here, moreover, three mounting tabs 21 (of which in the perspective view in FIG Fig. 1 however, only two are visible) that extend substantially orthogonally away from the outer wall 22 of the housing 2.
  • the intrinsically safe headlight 1 can be mounted via three attachment points at the point of use.
  • the intrinsically safe headlight 1 has an LED lighting device 6, which is accommodated within the housing 2 and comprises a plurality of LED lighting units 7.
  • the LED lighting device 6 has a total of twelve LED lighting units 7.
  • Each of the LED light units 7 in the embodiment shown here comprises in each case a high-performance light-emitting diode and an exchangeable lens and a replaceable reflector, so that depending on the intended use and choice of reflectors and / or the lenses beam angle between about 5 ° and about 80 ° can be achieved ,
  • the LED lighting device 6 further comprises a substantially disk-shaped light unit holder 8 having a first and a second mounting surface 80, 81, wherein the LED lighting units 7 are arranged on the first mounting surface 80 and on the second mounting surface 81, the first mounting surface 80th opposite, a heat sink 9 is attached.
  • the heat sink 9 which has a plurality of substantially mutually parallel cooling fins, the LED lighting units 7 passively cooled during operation of the intrinsically safe headlamp 1.
  • the light unit holder 8 and the heat sink 9 are separate components that are bolted together during assembly. Alternatively, however, there is also the possibility that the heat sink 9 is formed integrally with the light unit holder 8.
  • the LED lighting device 6 is mounted on a mounting plate 10 which is formed substantially annular.
  • three retaining bolts 11 are provided in the embodiment shown here, which extend substantially orthogonally away from the mounting plate 10.
  • the three retaining bolts 11 extend after assembly through corresponding through holes of the light unit holder 8 through and are secured by means of three nuts 14.
  • spacer bolts 15 Within the receiving space 20 of the housing 2, four spacer bolts 15 (of which in FIG Fig. 1 only two are recognizable) arranged, each having an internal thread.
  • the spacer bolts 15 are distributed in the circumferential direction on the inner wall of the housing 2.
  • the mounting plate 10 is placed on the spacer bolts 15 during assembly and with the help of four screws 16 which engage in the spacer bolt 15, screwed.
  • three intrinsically safe power supply devices are arranged in the embodiment presented here, which in the illustration in Fig. 1 However, are hidden by the mounting plate 10 and therefore are not visible.
  • the three power supply devices are on the mounting plate 10th mounted and then potted.
  • power supply devices are installed which have a particularly high internal resistance.
  • the power supply devices can operate, for example, with a supply voltage of 12.5 V (-10%, ..., + 200%) DC and a total current of 1.5 A.
  • two electrical terminal strips 17 are arranged within the housing.
  • two likewise intrinsically safe electrical connection elements 12, 13 are arranged on a rear wall 23 of the housing 2 in this embodiment, which can be designed in particular as an electrical connector or (with an additional terminal board) as a cable entry port.
  • To the intrinsically safe electrical connection elements 12, 13 can be connected from the outside in each case an electrical connection cable.
  • the electrical connection lines within the housing 2 are guided by the electrical connection elements 12, 13, which are preferably screwed into the housing rear wall 23 to the outside.
  • the intrinsically safe design of the headlight 1 ensures that the energy is kept low in its circuits so that no spark or thermal effect can arise, which can bring an explosive atmosphere to ignite ,
  • the intrinsically safe headlight 1 is also suitable for operation in potentially explosive areas.
  • the intrinsically safe headlamp 1 furthermore comprises a flasher unit which is coupled at least to some of the LED lighting units 7.
  • the Flasher mounted on the mounting plate 10 and potted with this.
  • the flashing frequency can be changed, for example, by means of a trimming potentiometer housed in the housing 2.
  • the light-emitting diodes which are installed in the LED lighting units 7 can be adapted specifically depending on the intended use of the intrinsically safe headlight 1.
  • the light-emitting diodes can have the colors white, green, red or blue.
  • all the color combinations listed above are possible, so that at least some LED lighting units can have different colors.
  • An advantage of using light-emitting diodes, which in this embodiment are so-called high-performance light-emitting diodes, consists in a high luminous efficacy, which can be achieved during the operation of the intrinsically safe headlight 1.
  • light-emitting diodes are characterized by a particularly long service life and low power consumption compared to other light sources.
  • the LED lighting units 7 may preferably be switchable such that the intrinsically safe headlight 1 has a low beam and a high beam function that can be selectively activated by a user. By activating the high-beam function of the intrinsically safe headlight 1, areas at a greater distance from the intrinsically safe headlight 1 can also be illuminated.
  • the LED lighting units 7 have a light-emitting diode that can emit light in the red spectral range.
  • the intrinsically safe headlamp 1 presented here can thus, in an advantageous embodiment, have a dipped beam function, a high beam function and a reversing light function (and optionally also a brake light function).
  • the intrinsically safe headlamp 1 described here can be installed, for example, in rail vehicles (diesel and battery packs, diesel, trolley and battery locomotives), drum skid steer loaders, electrically operated shovel loaders, track boring machines (partial and volute cutting machines), platforms or the like.
  • a possible variant of the wiring of the LED lighting device 6 in one of the aforementioned uses of the intrinsically safe headlight 1 will be explained below.
  • the LED lighting device 6 has a total of twelve LED lighting units 7. In this case, for example, with the help of three LED lighting units 7, whose light emitting diodes emit white light, a low beam function can be provided.
  • a combined high and low beam function can be provided.
  • the intrinsically safe headlamp 1 presented here is the illumination of objects which are monitored, for example, by means of a camera. Then, the twelve LED lighting units 7 of the LED lighting device 6 can each be equipped with a light-emitting diode that emits light in the white spectral range.

Abstract

The headlight has a housing cover (3) attached at a housing (2), and an intrinsically safe power supply for operating an LED lighting device (6) accommodated within the housing and/or within the housing cover. The LED lighting device has a set of LED lighting units (7) each comprising a reflector and a lens, where the reflectors and/or the lenses of the LED lighting units are exchangeable. The LED lighting units and a radiator (9) are attached to a lighting unit holder (8), where the lighting unit holder is attached at a mounting plate (10).

Description

Die vorliegende Erfindung betrifft einen eigensicheren Scheinwerfer, der für einen Betrieb in explosionsgefährdeten Bereichen geeignet und eingerichtet ist.The present invention relates to an intrinsically safe headlamp which is suitable and adapted for operation in potentially explosive atmospheres.

Eigensichere elektrische Geräte, die für einen Betrieb in explosionsgefährdeten Bereichen geeignet und eingerichtet sind, sind aus dem Stand der Technik in zahlreichen unterschiedlichen Ausführungsformen bereits bekannt. Elektrische Geräte werden dann als eigensicher bezeichnet, wenn die Energie in ihren Stromkreisen so gering gehalten wird, dass kein Funke oder thermischer Effekt entstehen kann, der eine explosionsfähige Atmosphäre zur Zündung bringen kann (Europäische Norm "Eigensicherheit": EN 60079-11:2007). Um die Eigensicherheit eines elektrischen Geräts zu erreichen, werden zum Beispiel spezielle Stromversorgungseinrichtungen verbaut, die einen besonders hohen Innenwiderstand aufweisen. Eigensichere Scheinwerfer sind aus dem Stand der Technik ebenfalls bekannt. Derartige Scheinwerfer haben während des Betriebs allerdings nur eine relativ geringe Lichtausbeute. Darüber hinaus weisen die Leuchtmittel der aus dem Stand der Technik bekannten eigensicheren Scheinwerfer eine vergleichsweise geringe Lebensdauer auf.Intrinsically safe electrical equipment that is suitable and suitable for operation in potentially explosive atmospheres are already known from the prior art in numerous different embodiments. Electrical equipment is considered to be intrinsically safe if the energy in its circuits is kept low enough to prevent the generation of a spark or thermal effect that can cause an explosive atmosphere to explode (European Standard "Intrinsic Safety": EN 60079-11: 2007) , To achieve the intrinsic safety of an electrical device, for example, special power supply devices are installed, which have a particularly high internal resistance. Intrinsically safe headlights are also known in the art. Such lights have during operation, however, only a relatively low light output. In addition, the lamps of the known from the prior art intrinsically safe headlight on a comparatively short life.

Hier setzt die vorliegende Erfindung an.This is where the present invention begins.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen eigensicheren> Scheinwerfer der eingangs genannten Art zur Verfügung zu stellen, der im Betrieb eine hohe Lichtausbeute erreicht.The present invention has for its object to provide an intrinsically safe> headlamp of the type mentioned, which achieves a high luminous efficacy in operation.

Diese Aufgabe wird durch einen eigensicheren Scheinwerfer mit den Merkmalen des Anspruchs 1 gelöst. Die Unteransprüche betreffen vorteilhafte Weiterbildungen der Erfindung.This object is achieved by an intrinsically safe headlamp with the features of claim 1. The subclaims relate to advantageous developments of the invention.

Gemäß Anspruch 1 umfasst ein erfindungsgemäßer eigensicherer Scheinwerfer

  • ein Gehäuse,
  • eine Gehäuseabdeckung, die am Gehäuse angebracht ist und eine transparente Scheibe aufweist,
  • eine LED-Leuchteinrichtung, die innerhalb des Gehäuses und/oder innerhalb der Gehäuseabdeckung untergebracht ist und eine Mehrzahl von LED-Leuchteinheiten mit mindestens einer Leuchtdiode aufweist,
  • mindestens eine eigensichere Stromversorgungseinrichtung für den Betrieb der LED-Leuchteinrichtung.
According to claim 1 comprises an inventive intrinsically safe headlight
  • a housing,
  • a housing cover which is attached to the housing and has a transparent disk,
  • an LED lighting device, which is housed within the housing and / or within the housing cover and having a plurality of LED lighting units with at least one light emitting diode,
  • at least one intrinsically safe power supply device for the operation of the LED lighting device.

Der erfindungsgemäße eigensichere Scheinwerfer, der für einen Betrieb in explosionsgefährdeten Bereichen geeignet und eingerichtet ist, kann zum Beispiel in Schienenflurfahrzeuge (insbesondere in Diesel- und Akkukatzen, in Diesel-, Fahrdraht- und Akkulokomotiven), in Walzenschrämlader, elektrisch betriebene Schaufellader, Streckenvortriebsmaschinen (Teilschnitt- und Vollschnittmaschinen), Ortsbühnen oder dergleichen eingebaut werden. Ein weiteres Anwendungsgebiet des erfindungsgemäßen eigensicheren Scheinwerfers bildet die Beleuchtung von Objekten, die zum Beispiel mittels einer Kamera überwacht werden. Ein Vorteil der hier vorgestellten Lösung besteht darin, dass mit Hilfe von Leuchtdioden, die vorzugsweise so genannte Hochleistungs-Leuchtdioden sind, eine hohe Lichtausbeute während des Betriebs des eigensicheren Scheinwerfers erreicht werden kann. Leuchtdioden zeichnen sich darüber hinaus im Vergleich zu anderen Leuchtmitteln durch eine besonders hohe Lebensdauer und durch einen geringen Stromverbrauch aus. Ein Vorteil der eigensicheren Ausführung des erfindungsgemäßen Scheinwerfers besteht darin, dass kein aufwendiger Gehäuseaufbau erforderlich ist, um den Betrieb in explosionsgefährdeten Bereichen zu ermöglichen. Sowohl das Gehäuse als auch die Gehäuseabdeckung können zum Beispiel im Wesentlichen zylindrisch geformt sein. Die transparente Scheibe, die den eigensicheren Scheinwerfer endseitig abschließt und durch die während des Betriebs das von der LED-Leuchteinrichtung emittierte Licht transmittiert werden kann, besteht vorzugsweise aus einem Sicherheitsglas. Die LED-Leuchteinheiten können einzeln oder auch gruppenweise ein- und ausschaltbar ausgeführt sein.The intrinsically safe headlamp according to the invention, which is suitable and adapted for operation in potentially explosive atmospheres, can be used, for example, in rail vehicles (especially in diesel and battery packs, in diesel, trolley and battery locomotives), in drum skid steer loaders, electrically operated shovel loaders, section tunneling machines (partial section) - and full-cut machines), local stages or the like are installed. Another field of application of the intrinsically safe headlamp according to the invention is the illumination of objects which are monitored, for example, by means of a camera. An advantage of the solution presented here is that with the help of light-emitting diodes, which are preferably so-called high-performance light-emitting diodes, a high luminous efficacy during operation of the intrinsically safe Headlamps can be achieved. In addition, light-emitting diodes are characterized by a particularly long service life and low power consumption compared to other light sources. An advantage of the intrinsically safe design of the headlight according to the invention is that no complex housing construction is required to allow operation in potentially explosive atmospheres. For example, both the housing and the housing cover may be substantially cylindrically shaped. The transparent pane, which terminates the intrinsically safe headlight on the end and through which the light emitted by the LED lighting device can be transmitted during operation, preferably consists of a safety glass. The LED lighting units can be individually switched on or off in groups.

In einer bevorzugten Ausführungsform wird vorgeschlagen, dass jede der LED-Leuchteinheiten einen Reflektor aufweist. Um zum Beispiel eine Bündelung des von jeder der LED-Leuchteinheiten während des Betriebs emittierten Lichts erreichen zu können, sieht eine besonders vorteilhafte Ausführungsform vor, dass jede der LED-Leuchteinheiten mindestens eine Linse aufweist. Durch die Kombination einer Linse und eines Reflektors kann die Abstrahlcharakteristik jeder LED-Leuchteinheit gezielt eingestellt und an die jeweiligen Gegebenheiten angepasst werden. In einer vorteilhaften Ausführungsform besteht die Möglichkeit, dass die Reflektoren und/oder die Linsen der LED-Leuchteinheiten austauschbar ausgeführt sind. Durch die auswechselbaren Linsen und/oder die auswechselbaren Reflektoren kann der Abstrahlwinkel der LED-Leuchteinheiten gezielt angepasst werden. Je nach Verwendungszweck können durch eine geeignete Wahl der Linsen und/oder der Reflektoren der LED-Leuchteinheiten Abstrahlwinkel zwischen etwa 5° und etwa 80° erreicht werden.In a preferred embodiment, it is proposed that each of the LED lighting units has a reflector. In order to be able to achieve, for example, bundling of the light emitted by each of the LED lighting units during operation, a particularly advantageous embodiment provides that each of the LED lighting units has at least one lens. By combining a lens and a reflector, the emission characteristics of each LED lighting unit can be adjusted specifically and adapted to the respective circumstances. In an advantageous embodiment, there is the possibility that the reflectors and / or the lenses of the LED lighting units are designed to be interchangeable. Due to the interchangeable lenses and / or the exchangeable reflectors, the beam angle of the LED lighting units can be specifically adapted. Depending on the intended use, by a suitable choice of the lenses and / or the reflectors of the LED lighting units beam angle between about 5 ° and about 80 ° can be achieved.

Um die Montage des eigensicheren Scheinwerfers zu vereinfachen, kann in einer vorteilhaften Ausführungsform vorgesehen sein, dass die LED-Leuchteinheiten an einer Leuchteinheitenhalterung angebracht sind. Die Leuchteinheitenhalterung, die insbesondere im Wesentlichen scheibenförmig ausgebildet sein kann, kann zum Beispiel mit den LED-Leuchteinheiten vorbestückt sein. Damit die LED-Leuchteinheiten auch bei relativ starken, lang andauernden Erschütterungen nicht ausfallen, sind die LED-Leuchteinheiten vorzugsweise rüttelsicher an der Leuchteinheitenhalterung montiert. Dadurch kann die Betriebssicherheit des eigensicheren Scheinwerfers erhöht werden.In order to simplify the mounting of the intrinsically safe headlamp, it can be provided in an advantageous embodiment that the LED lighting units are attached to a light unit holder. The light unit holder, which may in particular be substantially disc-shaped, may be pre-equipped, for example, with the LED light units. So that the LED lighting units do not fail even with relatively strong, long-lasting vibrations, the LED lighting units are preferably mounted vibration-proof on the light unit holder. As a result, the reliability of the intrinsically safe headlamp can be increased.

Um während des Betriebs des eingensicheren Scheinwerfers eine passive Kühlung der LED-Leuchteinheiten zu ermöglichen und dadurch die Ausfallsicherheit der Leuchtdioden zu erhöhen, ist in einer besonders vorteilhaften Ausführungsform vorgesehen, dass an der Leuchteinheitenhalterung ein Kühlkörper angebracht ist. In dieser Ausführungsform ist ein einziger Kühlkörper für alle LED-Leuchteinheiten vorgesehen. Alternativ besteht auch die Möglichkeit, dass mehrere Kühlkörper vorgesehen sind, denen jeweils mindestens eine der LED-Leuchteinheiten zugeordnet ist. Gegebenenfalls können einem Kühlkörper auch mehrere LED-Leuchteinheiten zugeordnet sein.In order to allow passive cooling of the LED light units during operation of the captive headlamp and thereby increase the reliability of the light-emitting diodes, it is provided in a particularly advantageous embodiment that a heat sink is attached to the light unit holder. In this embodiment, a single heat sink is provided for all the LED lighting units. Alternatively, it is also possible that a plurality of heat sinks are provided, each of which is associated with at least one of the LED lighting units. If appropriate, a heat sink may also be assigned a plurality of LED lighting units.

In einer weiteren vorteilhaften Ausführungsform kann vorgesehen sein, dass die Leuchteinheitenhalterung an einer Montageplatte befestigt ist. Die Montageplatte ist vorzugsweise im Gehäuse angeordnet.In a further advantageous embodiment it can be provided that the light unit holder is attached to a mounting plate. The mounting plate is preferably arranged in the housing.

Um die Montage des eigensicheren Scheinwerfers weiter zu vereinfachen, besteht in einer bevorzugten Ausführungsform die Möglichkeit, dass die mindestens eine eigensichere Stromversorgungseinrichtung, die vorzugsweise eine Konstantstromquelle ist, an der Montageplatte angeordnet ist.
Die mindestens eine Stromversorgungseinrichtung kann in einer besonders vorteilhaften Ausführungsform mit der Montageplatte vergossen sein. Bei dieser Ausführungsform wird die mindestens eine Stromversorgungseinrichtung zunächst an der Montageplatte montiert. Anschließend wird eine Vergussmasse aufgebracht und so die mindestens eine Stromversorgungseinrichtung mit der Montageplatte vergossen. Der eigensichere Scheinwerfer kann gemäß einer vorteilhaften Weiterbildung auch mehrere eigensichere Stromversorgungseinrichtungen (Konstantstromquellen) aufweisen, die vorzugsweise an der Montageplatte angebracht sind.In order to further simplify the mounting of the intrinsically safe headlamp, in a preferred embodiment there is the possibility that the at least one intrinsically safe Power supply device, which is preferably a constant current source, is arranged on the mounting plate.
The at least one power supply device may be potted in a particularly advantageous embodiment with the mounting plate. In this embodiment, the at least one power supply device is first mounted on the mounting plate. Subsequently, a potting compound is applied and so shed the at least one power supply device to the mounting plate. According to an advantageous development, the intrinsically safe headlight can also have a number of intrinsically safe power supply devices (constant current sources), which are preferably attached to the mounting plate.

Um die Lichtausbeute während des Betriebs des eigensicheren Scheinwerfers weiter zu erhöhen, sieht eine besonders vorteilhafte Ausführungsform vor, dass an einer Innenwand der Gehäuseabdeckung ein Reflektor angeordnet ist.In order to further increase the luminous efficacy during operation of the intrinsically safe headlamp, a particularly advantageous embodiment provides that a reflector is arranged on an inner wall of the housing cover.

Es besteht in einer besonders bevorzugten Ausführungsform die Möglichkeit, dass am Gehäuse mindestens ein eigensicheres elektrisches Anschlusselement angeordnet ist, an das ein elektrisches Anschlusskabel anschließbar ist. Das elektrische Anschlusselement kann zum Beispiel ein eigensicherer Steckverbinder sein.There is in a particularly preferred embodiment, the possibility that at least one intrinsically safe electrical connection element is arranged on the housing, to which an electrical connection cable can be connected. The electrical connection element may be, for example, an intrinsically safe connector.

Um dem eigensicheren Scheinwerfer zusätzlich eine Blinkfunktion zur Verfügung zu stellen, wird in einer bevorzugten Ausführungsform vorgeschlagen, dass der eigensichere Scheinwerfer mindestens einen Blinkgeber umfasst, der zumindest mit einigen der LED-Leuchteinheiten gekoppelt ist. Vorzugsweise ist der Blinkgeber an der Montageplatte angebracht. Der Blinkgeber kann zum Beispiel mit der Montageplatte vergossen sein. Die Blinkfrequenz kann über ein Trimmpotentiometer, das ebenfalls im Gehäuse des eigensicheren Scheinwerfers untergebracht ist, eingestellt werden.In order to additionally provide the intrinsically safe headlamp with a flashing function, it is proposed in a preferred embodiment that the intrinsically safe headlamp comprises at least one flasher unit which is coupled at least to some of the LED lighting units. Preferably, the flasher is attached to the mounting plate. The flasher unit may be potted with the mounting plate, for example. The blinking frequency can be over Trim potentiometer, which is also housed in the housing of the intrinsically safe headlight, can be adjusted.

Die Leuchtdioden der LED-Leuchteinheiten können insbesondere die Farben weiß, grün, rot oder blau haben. Optional sind auch alle vorstehend aufgeführten Farbkombinationen möglich, so dass zumindest einige der LED-Leuchteinheiten unterschiedliche Farben haben können.The light-emitting diodes of the LED light units can in particular have the colors white, green, red or blue. Optionally, all the color combinations listed above are possible, so that at least some of the LED lighting units can have different colors.

In einer besonders vorteilhaften Ausführungsform ist vorgesehen, dass die LED-Leuchteinheiten so ausgebildet und derart schaltbar sind, dass der eigensichere Scheinwerfer eine Abblendlicht- und eine Fernlichtfunktion aufweist. Bei Aktivierung der Fernlichtfunktion können auch Bereiche in größerer Entfernung vom eigensicheren Scheinwerfer ausgeleuchtet werden.In a particularly advantageous embodiment, it is provided that the LED lighting units are designed and switchable such that the intrinsically safe headlight has a low beam and a high beam function. When the high beam function is activated, areas at greater distances from the intrinsically safe headlight can also be illuminated.

In einer besonders vorteilhaften Ausführungsform wird vorgeschlagen, dass die mindestens eine Stromversorgungseinrichtung derart ausgebildet ist, dass sie mit einer Versorgungsspannung von 12,5 V (-10%, ..., +200%) DC und einem Gesamtstrom von 1,5 A betreibbar ist. Dadurch wird im Vergleich zu den aus dem Stand der Technik bekannten Lösungen ein extrem großer Versorgungsspannungsbereich, innerhalb dessen die mindestens eine Stromversorgungseinrichtung betrieben werden kann, zur Verfügung gestellt.In a particularly advantageous embodiment, it is proposed that the at least one power supply device is designed such that it can be operated with a supply voltage of 12.5 V (-10%,..., + 200%) DC and a total current of 1.5 A. is. As a result, in comparison with the solutions known from the prior art, an extremely large supply voltage range within which the at least one power supply device can be operated is made available.

Ferner besteht in einer weiteren vorteilhaften Ausführungsform die Möglichkeit, dass zumindest einige der LED-Leuchteinheiten mindestens eine Leuchtdiode aufweisen, die Licht im roten Spektralbereich emittieren kann. Vorzugsweise kann diese Gruppe von LED-Leuchteinheiten, deren Leuchtdioden jeweils Licht im roten Spektralbereich emittieren, separat von den übrigen LED-Leuchteinheiten ein- beziehungsweise ausgeschaltet und damit aktiviert und wieder deaktiviert werden, so dass der eigensichere Scheinwerfer eine Rückfahrlichtfunktion oder auch eine Bremslichtfunktion aufweist. Der eigensichere Scheinwerfer kann in einer vorteilhaften Ausführungsform somit eine Abblendlichtfunktion, eine Fernlichtfunktion und eine Rückfahrlichtfunktion (und gegebenenfalls eine zusätzliche Bremslichtfunktion) aufweisen, zwischen denen umgeschaltet werden kann.Furthermore, in a further advantageous embodiment, there is the possibility that at least some of the LED lighting units have at least one light-emitting diode that can emit light in the red spectral range. Preferably, this group of LED lighting units whose light emitting diodes each emit light in the red spectral range, separately from the other LED lighting units switched on and off and thus activated and deactivated again, so that the intrinsically safe headlamp has a reversing light function or a brake light function. In an advantageous embodiment, the intrinsically safe headlamp can thus have a dipped-beam function, a high-beam function and a reversing light function (and possibly an additional brake light function), between which it is possible to switch between.

Weitere Merkmale und Vorteile der vorliegenden Erfindung werden deutlich anhand der nachfolgenden Beschreibung eines bevorzugten Ausführungsbeispiels unter Bezugnahme auf die beiliegende Fig. 1, die eine Explosionsansicht eines eigensicheren Scheinwerfers 1 gemäß einem bevorzugten Ausführungsbeispiel der vorliegenden Erfindung zeigt.Other features and advantages of the present invention will become apparent from the following description of a preferred embodiment with reference to the accompanying drawings Fig. 1 showing an exploded view of an intrinsically safe headlamp 1 according to a preferred embodiment of the present invention.

Der eigensichere Scheinwerfer 1 umfasst ein im Wesentlichen zylindrisch ausgeführtes Gehäuse 2, welches einen Aufnahmeraum 20 festlegt, und eine damit korrespondierende, ebenfalls im Wesentlichen zylindrisch geformte Gehäuseabdeckung 3. Das Gehäuse 2 und die Gehäuseabdeckung 3 sind aus einem metallischen Werkstoff hergestellt, um dadurch die notwendige Stabilität zu erreichen. Die Gehäuseabdeckung 3 ist einseitig mittels einer transparenten Sicherheitsglasscheibe 31 abgeschlossen. An einer Innenwand der Gehäuseabdeckung 3 ist ferner ein Reflektor 32 angeordnet.The intrinsically safe headlight 1 comprises a substantially cylindrical housing 2, which defines a receiving space 20, and a corresponding, also substantially cylindrically shaped housing cover 3. The housing 2 and the housing cover 3 are made of a metallic material, thereby the necessary To achieve stability. The housing cover 3 is closed on one side by means of a transparent safety glass pane 31. On an inner wall of the housing cover 3, a reflector 32 is further arranged.

Die Gehäuseabdeckung 3 kann mit Hilfe mehrerer Montageschrauben 4, die in passende Montageöffnungen 5 eingreifen, welche an einer Außenwand des Gehäuses 2 vorgesehen sind und jeweils ein Innengewinde aufweisen, mit dem Gehäuse 2 verschraubt werden. In dem hier gezeigten Ausführungsbeispiel sind insgesamt drei Montageschrauben 4 sowie drei damit korrespondierende, mit einem Innengewinde versehene Montageöffnungen 5 vorgesehen, die äquidistant über den Außenumfang der Gehäuseabdeckung 3 beziehungsweise des Gehäuses 2 verteilt sind, so dass die Gehäuseabdeckung 3 über drei Befestigungspunkte sicher am Gehäuse 2 befestigt werden kann. Das Gehäuse 2 und die Gehäuseabdeckung 3 sind im montierten Zustand relativ kompakt ausgeführt, so dass der Betrieb des eigensicheren Scheinwerfers 1 auch bei einem vergleichsweise beschränkten, für die Anbringung des eigensicheren Scheinwerfers 1 zur Verfügung stehenden Platz möglich ist.The housing cover 3 can be screwed to the housing 2 by means of a plurality of mounting screws 4, which engage in suitable mounting openings 5, which are provided on an outer wall of the housing 2 and each have an internal thread. In the embodiment shown here, a total of three mounting screws 4 and three corresponding, provided with an internal thread mounting holes 5 are provided which are equidistantly distributed over the outer circumference of the housing cover 3 and the housing 2, so that the housing cover 3 via three attachment points securely on the housing. 2 can be attached. The housing 2 and the housing cover 3 are made relatively compact in the assembled state, so that the operation of the intrinsically safe headlamp. 1 even with a comparatively limited, for the attachment of the intrinsically safe headlight 1 available space is possible.

Das Gehäuse 2 weist in dem hier gezeigten Ausführungsbeispiel darüber hinaus drei Befestigungslaschen 21 (von denen in der perspektivischen Darstellung in Fig. 1 jedoch nur zwei zu erkennen sind) auf, die sich im Wesentlichen orthogonal von der Außenwand 22 des Gehäuses 2 weg erstrecken. Mit Hilfe der drei Befestigungslaschen 21 kann der eigensichere Scheinwerfer 1 über drei Befestigungspunkte am Ort des Gebrauchs montiert werden.The housing 2, in the embodiment shown here, moreover, three mounting tabs 21 (of which in the perspective view in FIG Fig. 1 however, only two are visible) that extend substantially orthogonally away from the outer wall 22 of the housing 2. With the help of the three fastening tabs 21, the intrinsically safe headlight 1 can be mounted via three attachment points at the point of use.

Ferner weist der eigensichere Scheinwerfer 1 eine LED-Leuchteinrichtung 6 auf, die innerhalb des Gehäuses 2 untergebracht ist und eine Mehrzahl von LED-Leuchteinheiten 7 umfasst. In dem hier gezeigten Ausführungsbeispiel weist die LED-Leuchteinrichtung 6 insgesamt zwölf LED-Leuchteinheiten 7 auf. Jede der LED-Leuchteinheiten 7 umfasst in dem hier gezeigten Ausführungsbeispiel jeweils eine Hochleistungsleuchtdiode sowie eine auswechselbare Linse und einen auswechselbaren Reflektor, so dass je nach Verwendungszweck und Wahl der Reflektoren und/oder der Linsen Abstrahlwinkel zwischen etwa 5° und etwa 80°erreicht werden können.Furthermore, the intrinsically safe headlight 1 has an LED lighting device 6, which is accommodated within the housing 2 and comprises a plurality of LED lighting units 7. In the exemplary embodiment shown here, the LED lighting device 6 has a total of twelve LED lighting units 7. Each of the LED light units 7 in the embodiment shown here comprises in each case a high-performance light-emitting diode and an exchangeable lens and a replaceable reflector, so that depending on the intended use and choice of reflectors and / or the lenses beam angle between about 5 ° and about 80 ° can be achieved ,

Die LED-Leuchteinrichtung 6 weist ferner eine im Wesentlichen scheibenförmige Leuchteinheitenhalterung 8 mit einer ersten und einer zweiten Montagefläche 80, 81 auf, wobei an der ersten Montagefläche 80 die LED-Leuchteinheiten 7 angeordnet sind und an der zweiten Montagefläche 81, die der ersten Montagefläche 80 gegenüberliegt, ein Kühlkörper 9 angebracht ist. Mit Hilfe des Kühlkörpers 9, der mehrere im Wesentlichen parallel zueinander angeordnete Kühllamellen aufweist, können die LED-Leuchteinheiten 7 während des Betriebs des eigensicheren Scheinwerfers 1 passiv gekühlt werden. In dem hier dargestellten Ausführungsbeispiel sind die Leuchteinheitenhalterung 8 und der Kühlkörper 9 separate Bauteile, die bei der Montage miteinander verschraubt werden. Alternativ besteht jedoch auch die Möglichkeit dass der Kühlkörper 9 integral mit der Leuchteinheitenhalterung 8 ausgebildet ist.The LED lighting device 6 further comprises a substantially disk-shaped light unit holder 8 having a first and a second mounting surface 80, 81, wherein the LED lighting units 7 are arranged on the first mounting surface 80 and on the second mounting surface 81, the first mounting surface 80th opposite, a heat sink 9 is attached. With the help of the heat sink 9, which has a plurality of substantially mutually parallel cooling fins, the LED lighting units 7 passively cooled during operation of the intrinsically safe headlamp 1. In the embodiment shown here, the light unit holder 8 and the heat sink 9 are separate components that are bolted together during assembly. Alternatively, however, there is also the possibility that the heat sink 9 is formed integrally with the light unit holder 8.

Die LED-Leuchteinrichtung 6 ist an einer Montageplatte 10 montiert, die im Wesentlichen ringförmig ausgebildet ist. Zur Befestigung der LED-Leuchteinrichtung 6 an der Montageplatte 10 sind in dem hier gezeigten Ausführungsbeispiel drei Haltebolzen 11 vorgesehen, die sich im Wesentlichen orthogonal von der Montageplatte 10 weg erstrecken. Die drei Haltebolzen 11 erstrecken sich nach der Montage durch entsprechende Durchbohrungen der Leuchteinheitenhalterung 8 hindurch und werden mit Hilfe dreier Muttern 14 gesichert. Innerhalb des Aufnahmeraums 20 des Gehäuses 2 sind in diesem Ausführungsbeispiel zur Befestigung der Montageplatte 10 vier Abstandsbolzen 15 (von denen in Fig. 1 nur zwei erkennbar sind) angeordnet, die jeweils ein Innengewinde aufweisen. Die Abstandsbolzen 15 sind dabei in Umfangsrichtung verteilt an der Innenwand des Gehäuses 2 befestigt. Die Montageplatte 10 wird beim Zusammenbau auf die Abstandsbolzen 15 aufgesetzt und mit Hilfe von vier Schrauben 16, die in die Abstandsbolzen 15 eingreifen, verschraubt.The LED lighting device 6 is mounted on a mounting plate 10 which is formed substantially annular. For fixing the LED lighting device 6 to the mounting plate 10, three retaining bolts 11 are provided in the embodiment shown here, which extend substantially orthogonally away from the mounting plate 10. The three retaining bolts 11 extend after assembly through corresponding through holes of the light unit holder 8 through and are secured by means of three nuts 14. Within the receiving space 20 of the housing 2, four spacer bolts 15 (of which in FIG Fig. 1 only two are recognizable) arranged, each having an internal thread. The spacer bolts 15 are distributed in the circumferential direction on the inner wall of the housing 2. The mounting plate 10 is placed on the spacer bolts 15 during assembly and with the help of four screws 16 which engage in the spacer bolt 15, screwed.

An der nach der Montage in den Aufnahmeraum 20 des Gehäuses 2 weisenden Fläche der Montageplatte 10 sind in dem hier vorgestellten Ausführungsbeispiel drei eigensichere Stromversorgungseinrichtungen (eigensichere Konstantstromquellen) angeordnet, die in der Darstellung in Fig. 1 allerdings durch die Montageplatte 10 verdeckt sind und daher nicht zu erkennen sind. Die drei Stromversorgungseinrichtungen werden an der Montageplatte 10 montiert und anschließend vergossen. Um die Eigensicherheit des Scheinwerfers 1 zu erreichen, werden Stromversorgungseinrichtungen verbaut, die einen besonders hohen Innenwiderstand aufweisen. Die Stromversorgungseinrichtungen können beispielsweise mit einer Versorgungsspannung von 12,5 V (-10%, ..., +200%) DC und einem Gesamtstrom von 1,5 A arbeiten. Ferner sind innerhalb des Gehäuses zwei elektrische Klemmenleisten 17 angeordnet. Darüber hinaus sind an einer Rückwand 23 des Gehäuses 2 in diesem Ausführungsbeispiel zwei ebenfalls eigensicher ausgeführte elektrische Anschlusselemente 12, 13 angeordnet, die insbesondere als elektrische Steckverbinder oder (mit einem zusätzlichen Klemmbrett) als Leitungseinführungsstutzen ausgeführt sein können. An die eigensicheren elektrischen Anschlusselemente 12, 13 kann von außen jeweils ein elektrisches Anschlusskabel angeschlossen werden. Die elektrischen Anschlussleitungen innerhalb des Gehäuses 2 werden durch die elektrischen Anschlusselemente 12, 13, die vorzugsweise in die Gehäuserückwand 23 eingeschraubt sind, nach außen geführt.At the after installation in the receiving space 20 of the housing 2 facing surface of the mounting plate 10 three intrinsically safe power supply devices (intrinsically safe constant current sources) are arranged in the embodiment presented here, which in the illustration in Fig. 1 However, are hidden by the mounting plate 10 and therefore are not visible. The three power supply devices are on the mounting plate 10th mounted and then potted. In order to achieve intrinsic safety of the headlight 1, power supply devices are installed which have a particularly high internal resistance. The power supply devices can operate, for example, with a supply voltage of 12.5 V (-10%, ..., + 200%) DC and a total current of 1.5 A. Furthermore, two electrical terminal strips 17 are arranged within the housing. In addition, two likewise intrinsically safe electrical connection elements 12, 13 are arranged on a rear wall 23 of the housing 2 in this embodiment, which can be designed in particular as an electrical connector or (with an additional terminal board) as a cable entry port. To the intrinsically safe electrical connection elements 12, 13 can be connected from the outside in each case an electrical connection cable. The electrical connection lines within the housing 2 are guided by the electrical connection elements 12, 13, which are preferably screwed into the housing rear wall 23 to the outside.

Durch den eigensicheren Aufbau des Scheinwerfers 1 (insbesondere der Stromversorgungseinrichtungen sowie der elektrischen Anschlusselemente 12, 13) wird erreicht, dass die Energie in seinen Stromkreisen so gering gehalten wird, dass kein Funke oder thermischer Effekt entstehen kann, der eine explosionsfähige Atmosphäre zur Zündung bringen kann. Somit eignet sich der eigensichere Scheinwerfer 1 auch für einen Betrieb in explosionsgefährdeten Bereichen.Due to the intrinsically safe design of the headlight 1 (in particular the power supply devices and the electrical connection elements 12, 13) ensures that the energy is kept low in its circuits so that no spark or thermal effect can arise, which can bring an explosive atmosphere to ignite , Thus, the intrinsically safe headlight 1 is also suitable for operation in potentially explosive areas.

Um zumindest einigen der LED-Leuchteinheiten 7 des eigensicheren Scheinwerfers 1 eine zusätzliche Blinkfunktion zur Verfügung zu stellen, besteht die Möglichkeit, dass der eigensichere Scheinwerfer 1 darüber hinaus einen Blinkgeber umfasst, der zumindest mit einigen der LED-Leuchteinheiten 7 gekoppelt ist. Vorzugsweise ist der Blinkgeber an der Montageplatte 10 angebracht und mit dieser vergossen. Die Blinkfrequenz kann zum Beispiel über ein Trimmpotentiometer, das im Gehäuse 2 untergebracht ist, verändert werden.In order to provide an additional flashing function for at least some of the LED lighting units 7 of the intrinsically safe headlamp 1, there is the possibility that the intrinsically safe headlamp 1 furthermore comprises a flasher unit which is coupled at least to some of the LED lighting units 7. Preferably, the Flasher mounted on the mounting plate 10 and potted with this. The flashing frequency can be changed, for example, by means of a trimming potentiometer housed in the housing 2.

Die Leuchtdioden, die in den LED-Leuchteinheiten 7 verbaut sind, können abhängig vom Verwendungszweck des eigensicheren Scheinwerfers 1 spezifisch angepasst werden. Die Leuchtdioden können insbesondere die Farben weiß, grün, rot oder blau haben. Optional sind auch alle vorstehend aufgeführten Farbkombinationen möglich, so dass zumindest einige LED-Leuchteinheiten unterschiedliche Farben haben können. Ein Vorteil der Verwendung von Leuchtdioden, die in diesem Ausführungsbeispiel so genannte Hochleistungsleuchtdioden sind, besteht in einer hohen Lichtausbeute, die während des Betriebs des eigensicheren Scheinwerfers 1 erreicht werden kann. Leuchtdioden zeichnen sich darüber hinaus im Vergleich zu anderen Leuchtmitteln durch eine besonders hohe Lebensdauer und durch einen geringen Stromverbrauch aus.The light-emitting diodes which are installed in the LED lighting units 7 can be adapted specifically depending on the intended use of the intrinsically safe headlight 1. In particular, the light-emitting diodes can have the colors white, green, red or blue. Optionally, all the color combinations listed above are possible, so that at least some LED lighting units can have different colors. An advantage of using light-emitting diodes, which in this embodiment are so-called high-performance light-emitting diodes, consists in a high luminous efficacy, which can be achieved during the operation of the intrinsically safe headlight 1. In addition, light-emitting diodes are characterized by a particularly long service life and low power consumption compared to other light sources.

Die LED-Leuchteinheiten 7 können vorzugsweise derart schaltbar sein, dass der eigensichere Scheinwerfer 1 eine Abblendlicht- und eine Fernlichtfunktion aufweist, die von einem Benutzer wahlweise aktiviert werden können. Durch eine Aktivierung der Fernlichtfunktion des eigensicheren Scheinwerfers 1 können auch Bereiche in größerer Entfernung vom eigensicheren Scheinwerfer 1 ausgeleuchtet werden.The LED lighting units 7 may preferably be switchable such that the intrinsically safe headlight 1 has a low beam and a high beam function that can be selectively activated by a user. By activating the high-beam function of the intrinsically safe headlight 1, areas at a greater distance from the intrinsically safe headlight 1 can also be illuminated.

Ferner besteht die Möglichkeit, dass zumindest einige der LED-Leuchteinheiten 7 eine Leuchtdiode aufweisen, die Licht im roten Spektralbereich emittieren kann. Vorzugsweise kann diese Gruppe von LED-Leuchteinheiten 7, deren Leuchtdioden Licht im roten Spektralbereich emittieren, separat von den übrigen LED-Leuchteinheiten 7 ein- beziehungsweise ausgeschaltet werden, so dass dem eigensicheren Scheinwerfer 1 auch eine Rückfahrlichtfunktion (mit rotem Licht) und/oder eine Bremslichtfunktion (mit rotem Licht) zur Verfügung gestellt werden kann. Der hier vorgestellte eigensichere Scheinwerfer 1 kann somit in einer vorteilhaften Ausführungsform eine Abblendlichtfunktion, eine Fernlichtfunktion und eine Rückfahrlichtfunktion (und optional auch eine Bremslichtfunktion) aufweisen.Furthermore, there is the possibility that at least some of the LED lighting units 7 have a light-emitting diode that can emit light in the red spectral range. Preferably, this group of LED lighting units 7, whose LEDs emit light in the red spectral range, separately from the other LED lighting units 7 are switched on or off, so that the intrinsically safe headlight 1 also a reverse light function (with red light) and / or a brake light function (with red light) can be provided. The intrinsically safe headlamp 1 presented here can thus, in an advantageous embodiment, have a dipped beam function, a high beam function and a reversing light function (and optionally also a brake light function).

Der hier beschriebene eigensichere Scheinwerfer 1 kann zum Beispiel in Schienenflurfahrzeuge (Diesel- und Akkukatzen, Diesel-, Fahrdraht- und Akkulokomotiven), Walzenschrämlader, elektrisch betriebene Schaufellader, Streckenvortriebsmaschinen (Teilschnitt- und Volischnittmaschinen), Ortsbühnen oder dergleichen eingebaut werden. Eine mögliche Variante der Beschaltung der LED-Leuchteinrichtung 6 bei einer der vorstehend genannten Verwendungen des eigensicheren Scheinwerfers 1 soll nachfolgend erläutert werden. Wie oben bereits erwähnt, weist die LED-Leuchteinrichtung 6 in dem hier gezeigten Ausführungsbeispiel insgesamt zwölf LED-Leuchteinheiten 7 auf. Dabei kann zum Beispiel mit Hilfe von drei LED-Leuchteinheiten 7, deren Leuchtdioden weißes Licht emittieren, eine Abblendlichtfunktion zur Verfügung gestellt werden. Durch Zuschaltung von sechs weiteren LED-Leuchteinheiten 7, deren Leuchtdioden ebenfalls weißes Licht emittieren, kann eine kombinierte Fern- und Abblendlichtfunktion bereitgestellt werden. Drei separat aktivierbare LED-Leuchteinheiten 7, deren Leuchtdioden Licht im roten Spektralbereich emittieren, können zusätzlich eine Rückfahrlichtfunktion und/oder eine Bremslichtfunktion zur Verfügung stellen. Sofern der eigensichere Scheinwerfer 1 einen Blinkgeber aufweist, der mit denjenigen LED-Leuchteinheiten 7 gekoppelt ist, die Licht im roten Spektralbereich emittieren, kann zusätzlich eine Blinklichtfunktion (in der Farbe rot) bereitgestellt werden.The intrinsically safe headlamp 1 described here can be installed, for example, in rail vehicles (diesel and battery packs, diesel, trolley and battery locomotives), drum skid steer loaders, electrically operated shovel loaders, track boring machines (partial and volute cutting machines), platforms or the like. A possible variant of the wiring of the LED lighting device 6 in one of the aforementioned uses of the intrinsically safe headlight 1 will be explained below. As already mentioned above, in the exemplary embodiment shown here, the LED lighting device 6 has a total of twelve LED lighting units 7. In this case, for example, with the help of three LED lighting units 7, whose light emitting diodes emit white light, a low beam function can be provided. By connecting six further LED lighting units 7, whose light emitting diodes also emit white light, a combined high and low beam function can be provided. Three separately activatable LED lighting units 7, whose LEDs emit light in the red spectral range, can additionally provide a reversing light function and / or a brake light function. If the intrinsically safe headlight 1 has a flasher unit which is coupled to those LED lighting units 7 which emit light in the red spectral range, an additional flashing light function (red in color) can be provided.

Ein weiteres mögliches Anwendungsgebiet des hier vorgestellten eigensicheren Scheinwerfers 1 bildet die Beleuchtung von Objekten, die beispielsweise mittels einer Kamera überwacht werden. Dann können die zwölf LED-Leuchteinheiten 7 der LED-Leuchteinrichtung 6 jeweils mit einer Leuchtdiode bestückt sein, die Licht im weißen Spektralbereich emittiert.Another possible application of the intrinsically safe headlamp 1 presented here is the illumination of objects which are monitored, for example, by means of a camera. Then, the twelve LED lighting units 7 of the LED lighting device 6 can each be equipped with a light-emitting diode that emits light in the white spectral range.

Claims (15)

Eigensicherer Scheinwerfer (1), geeignet für einen Betrieb in explosionsgefährdeten Bereichen, umfassend - ein Gehäuse (2), - eine Gehäuseabdeckung (3), die am Gehäuse (2) angebracht ist und eine transparente Scheibe (31) aufweist, - eine LED-Leuchteinrichtung (6), die innerhalb des Gehäuses (2) und/oder innerhalb der Gehäuseabdeckung (3) untergebracht ist und eine Mehrzahl von LED-Leuchteinheiten (7) mit mindestens einer Leuchtdiode aufweist, und - mindestens eine eigensichere Stromversorgungseinrichtung für den Betrieb der LED-Leuchteinrichtung (6). Intrinsically safe headlamp (1), suitable for operation in potentially explosive atmospheres a housing (2), a housing cover (3) which is attached to the housing (2) and has a transparent disk (31), - An LED lighting device (6) which is housed within the housing (2) and / or within the housing cover (3) and having a plurality of LED lighting units (7) with at least one light emitting diode, and - At least one intrinsically safe power supply device for the operation of the LED lighting device (6). Eigensicherer Scheinwerfer (1) nach Anspruch 1, dadurch gekennzeichnet, dass jede der LED-Leuchteinheiten (7) einen Reflektor aufweist.Intrinsically safe headlamp (1) according to claim 1, characterized in that each of the LED lighting units (7) comprises a reflector. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass jede der LED-Leuchteinheiten (7) mindestens eine Linse aufweist.Intrinsically safe headlamp (1) according to one of claims 1 or 2, characterized in that each of the LED lighting units (7) has at least one lens. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 2 oder 3, dadurch gekennzeichnet, dass die Reflektoren und/oder die Linsen der LED-Leuchteinheiten (7) austauschbar ausgeführt sind.Intrinsically safe headlamp (1) according to one of claims 2 or 3, characterized in that the reflectors and / or the lenses of the LED lighting units (7) are designed to be interchangeable. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die LED-Leuchteinheiten (7) an einer Leuchteinheitenhalterung (8) angebracht sind.Intrinsically safe headlamp (1) according to one of claims 1 to 4, characterized in that the LED lighting units (7) are mounted on a light unit holder (8). Eigensicherer Scheinwerfer (1) nach Anspruch 5, dadurch gekennzeichnet, dass an der Leuchteinheitenhalterung (8) mindestens ein Kühlkörper (9) angebracht ist.Intrinsically safe headlight (1) according to claim 5, characterized in that at least one heat sink (9) is attached to the light unit holder (8). Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, dass die Leuchteinheitenhalterung (8) an einer Montageplatte (10) angebracht ist.Intrinsically safe headlight (1) according to one of claims 5 or 6, characterized in that the light unit holder (8) is mounted on a mounting plate (10). Eigensicherer Scheinwerfer (1) nach Anspruch 7, dadurch gekennzeichnet, dass die mindestens eine Stromversorgungseinrichtung an der Montageplatte (10) angeordnet ist.Intrinsically safe headlight (1) according to claim 7, characterized in that the at least one power supply device is arranged on the mounting plate (10). Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 7 oder 8, dadurch gekennzeichnet, dass die mindestens eine Stromversorgungseinrichtung mit der Montageplatte (10) vergossen ist.Intrinsically safe headlamp (1) according to one of claims 7 or 8, characterized in that the at least one power supply device with the mounting plate (10) is cast. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, dass an einer Innenwand der Gehäuseabdeckung (3) ein Reflektor (32) angeordnet ist.Intrinsically safe headlight (1) according to one of Claims 1 to 9, characterized in that a reflector (32) is arranged on an inner wall of the housing cover (3). Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 10, dadurch gekennzeichnet, dass am Gehäuse (2) mindestens ein eigensicheres elektrisches Anschlusselement (12, 13) angeordnet ist, an das ein elektrisches Anschlusskabel anschließbar ist.Intrinsically safe headlamp (1) according to one of claims 1 to 10, characterized in that the housing (2) at least one intrinsically safe electrical connection element (12, 13) is arranged, to which an electrical connection cable can be connected. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 11, dadurch gekennzeichnet, dass der eigensichere Scheinwerfer (1) mindestens einen Blinkgeber umfasst, der zumindest mit einigen der LED-Leuchteinheiten gekoppelt ist.Intrinsically safe headlamp (1) according to one of claims 1 to 11, characterized in that the intrinsically safe headlamp (1) comprises at least one flasher unit which is coupled at least to some of the LED lighting units. Eigensicherer Scheinwerfer (1) nach Anspruch 12, dadurch gekennzeichnet, dass der Blinkgeber an der Montageplatte (10) angebracht ist.Intrinsically safe headlight (1) according to claim 12, characterized in that the flasher unit is mounted on the mounting plate (10). Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 13, dadurch gekennzeichnet, dass die LED-Leuchteinheiten (7) so ausgebildet und derart schaltbar sind, dass der eigensichere Scheinwerfer (1) eine Abblendlicht- und eine Fernlichtfunktion aufweist.Intrinsically safe headlamp (1) according to one of claims 1 to 13, characterized in that the LED lighting units (7) are designed and switchable such that the intrinsically safe headlamp (1) has a low beam and a high beam function. Eigensicherer Scheinwerfer (1) nach einem der Ansprüche 1 bis 14, dadurch gekennzeichnet, dass die mindestens eine Stromversorgungseinrichtung derart ausgebildet ist, dass sie mit einer Versorgungsspannung von 12,5 V (-10%, ..., +200%) DC und einem Gesamtstrom von 1,5 A betreibbar ist.Intrinsically safe headlight (1) according to one of claims 1 to 14, characterized in that the at least one power supply device is designed such that it with a supply voltage of 12.5 V (-10%, ..., + 200%) DC and a total current of 1.5 A is operable.
EP09005701A 2008-04-25 2009-04-23 Inherently safe headlamp Withdrawn EP2116763A1 (en)

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