EP1925879A1 - Housing for light fitting and light fitting providing this housing - Google Patents

Abstract

The housing has a housing upper part (2) and a housing lower part (4) for admission of light (1) and a light emission window. The housing upper part and the housing lower part are thermally coupled by attaching an intermediate layer (6) between the upper and lower part. Material of the intermediate layer is thermally conductive worse than the material used for the housing upper part and housing lower part. The upper part and the lower part forms two side areas (14,16) lying opposite to each other. Independent claims are also included for the following: (1) a light (2) a road lamp (3) a floodlight device (4) the use of the housing.

Description

The present invention relates to a housing for lighting fixtures, in particular for high-power LED lighting fixtures, comprising at least one upper housing part and at least one lower housing part, suitable for receiving at least one lighting fixture and containing at least one light exit window.

Furthermore, the invention relates to a luminaire, comprising at least one housing according to the invention and at least one luminaire present in the housing. Finally, the invention relates to a street lamp and a flood light device comprising at least one inventive housing or a lamp according to the invention and a mast base or a wire suspension.

The use of LED bulbs is steadily increasing, not least thanks to the longer life compared to conventional bulbs. In addition, in addition to LED bulbs that emit white or red light, such LED bulbs are now commercially available that emit blue light. In addition to the current trend to use LED bulbs as design elements in building interiors, LED bulbs are already used as car headlights or for other outdoor applications. According to the US 6,784,357 B1 For example, on-board LEDs can also be used for street lamps. Corresponding applications can also be found in the US 2006/0056169 A1 , of the KR 10 2001 0068027 A , of the KR 10 2003 0014953 A and the DE 20 2004 009 691 U1 described. To a place, a road or a way with a To illuminate LED bulbs as evenly as possible is in accordance with DE 203 17 444 U1 to use a transparent light-guiding body as a light-emitting device cover, which has a tapered edge on its side facing away from the light sources. Streetlights with ultra-bright LED bulbs to equip, is the DE 201 10 137U1 refer to. Ultra-bright light-emitting diodes are described as having a light intensity of at least 2000 mcd (milli-candela).

The DE 200 22 873 U1 discloses a luminaire with a receptacle for a luminous element and with a housing which at least partially surrounds a space provided for the luminous body, wherein the housing has an upper housing part and a lower housing part. Between the upper housing part and the lower housing part, at least one gap is provided, through which an exchange of air between the interior of the lamp surrounded by the housing and the outer space is possible. With such a luminaire should be able to achieve increased efficiency.

From the DE 39 11 900 C2 is a housing for an explosion-proof light with a trough-like upper part of at least one end provided with end caps section of an extruded profile whose cross-section is approximately U-shaped and has two outgoing from a flat bottom and integral with this leg, and one with the upper part to be connected translucent lid. This translucent lid is sealed from the top by means of a gasket. According to the DE 39 11 900 C2 have housing tops of explosion-proof lights then no longer have a one-piece shape when the lid is hinged to the upper part by means of a hinge and edge rests on the upper part and also if the extruded profile in a leg near the free end of the upper part extending in the longitudinal direction Has groove for receiving a portion of the upper part connecting the lid hinge.

Conventional LED luminaires, in particular those in which a plurality of LEDs are used, have to accept a loss of efficiency due to thermal heating, in particular during continuous operation. Without external cooling, it is quite possible to achieve a working temperature of 120 ° C. in the case of such LED lighting elements. To avoid even further heating of such LED luminous body are the associated power supplies mostly spatially separated from these installed, resulting in a complex housing design results. With permanently high operating temperatures, the lifespan of LEDs is also regularly reduced, which results in an increased maintenance effort for such luminous bodies.

It would therefore be desirable to be able to use LED luminous bodies, which are not associated with the above-described shortcomings of the prior art. It was therefore an object of the present invention to provide luminous bodies whose thermal behavior is maintained even in the case of a large number of individual luminous sources in a small space, i. with high packing density, can be controlled and in addition, however, many design options open.

Accordingly, a housing for lighting fixtures, in particular for LED lighting fixtures and high-performance LED lighting fixtures, found in which the upper housing part and the lower housing part by attaching at least one intermediate layer between the upper housing part and the lower housing part at least partially, in particular completely, are thermally decoupled, wherein the material of this intermediate layer is thermally less conductive than the material used for the upper housing part and the lower housing part, and wherein the upper housing part and the lower housing part form opposite first and second side areas, wherein at least one through opening extends from the first side area to the second side area ,

With the subdivision into the upper and lower part of the housing, according to the invention, an orientation of the housing in the room is not necessarily to be prescribed, although hereby a preferred orientation is reproduced. Upper and lower part can eg just as well represent the generic use of the housing front and rear. Also, when light is to be radiated upward, the lower part of the housing according to the invention come to rest over the upper part. Housing upper part and lower part can accordingly be described with first or second housing part readily.

In the case of the housing according to the invention, the housing upper part and the housing lower part are thermally decoupled at least in sections, in particular completely, and simultaneously form opposing first and second side regions, wherein at least one through opening extends from the first side region to the second side region.

In one embodiment, the first and second side regions each adjoin one another opposite to the side of the housing base which has the light exit window. This side having the light exit window is generally opposite the side covering the upper housing part, into which the first and second side areas pass. In general, no further geometric restrictions are imposed on the housing according to the invention over the previously described specifications. Of course, the lower housing part, although referred to as the lower part, can also be located above the housing upper part in certain applications, if e.g. the radiation exit from the light exit window in the vertical direction should point upwards. Of course, the upper housing part next to the lower housing part have one or more light emission windows. In the case of the housing according to the invention, the housing lower part is expediently designed to accommodate a lighting fixture, in particular a plurality of lighting fixtures. With the described inventive housing succeeds in a simple and efficient way to maintain a very low operating temperature even in continuous operation.

While the lighting fixture is housed regularly in the lower housing part, the upper housing part of the housing according to the invention is suitable for receiving electrical components for operating the lighting fixtures, for example LEDs, as well as optionally further devices. These electrical components may be, for example, transformers or constant current sources with transformers or power supplies. In order to establish a connection between, for example, the power supply units and the lighting fixtures, for example high-power LEDs, in a preferred embodiment the housing can additionally be equipped with at least one duct for receiving lines extending from the upper housing part into the lower housing part Conduit is made of a material that is less thermally conductive than the material used for the housing part and the housing lower part.

Thermally decoupled in the sense of the present invention, the lower housing part and the upper housing part are generally when a thermal equilibrium between the lower and upper part or a heat transfer through a material connection between the lower and upper part is limited or prevented. This can also be done, for example, in one embodiment, characterized in that the upper housing part and lower housing part are separated by a substantially circumferential air gap. In a particularly expedient and effective embodiment, the upper housing part and the lower housing part are in each case on opposite sides of a material intermediate layer. This thermal layer, which does not act as a thermal bridge but as a heat barrier, can be provided everywhere where the upper housing part and the lower housing part could come into contact with each other. Alternatively, this intermediate material layer can also act as a spacer in such a way that individual sections remain free and allow air to pass through.

The material for the intermediate layer preferably has a thermal conductivity 1 less than 0.5 W / mK, in particular less than 0.4 W / mK and particularly preferably not greater than 0.3 W / mK. For the determination of the thermal conductivity of the interlayer materials, the regulations according to DIN 1341 can be used.

Particularly preferably, a plastic material, in particular a polyalkylene oxide and / or a styrene (co) polymer, is used as the material for the intermediate layer and / or the conduit. Among these materials, polyoxymethylene (POM) and isotactic polystyrene are particularly preferable.

Particularly preferably, a plastic material, in particular a polyalkylene oxide and / or a styrene (co) polymer, is used as the material for the intermediate layer and / or the conduit. Among these materials, polyoxymethylene (POM) and isotactic polystyrene are particularly preferable.

Suitable plastic materials further include styrenic copolymers such as ABS, ASA, MABS, MBS and SAN. Also suitable are polyamides, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polycarbonates, polyvinyl chloride, polyacrylonitrile, polyolefins such as polyethylene and polypropylene, polyethersulfones, polyimides, polyketones, poly (meth) acrylates, Polyphenylene ethers, polyphenylene sulfides, polyphenylene sulfones, polystyrenes, polysulfones, polytetrafluoroethylene, polyurethanes in impact-modified and non-impact modified form and any desired mixtures of the abovementioned polymers. Of course, it is also possible to use copolymeric forms of the abovementioned plastics.

The passage opening from the first to the second side region of the housing according to the invention preferably extends substantially almost over the entire length of the housing. Depending on the size of the housing, one or more through holes may be attached. This passage opening allows a particularly effective removal of generated by the luminous body and / or power supplies thermal energy. This succeeds particularly effective in that protrude into the passage opening a plurality of spaced cooling fins which are at least partially thermally coupled to the housing lower part. It can be provided that the cooling fins are predominantly aligned substantially parallel. Particularly advantageously, a plurality of cooling fins, in particular all cooling fins, extends from the first side region to the second side region. A particularly advantageous removal of generated heat also takes place in that the cooling fins are aligned substantially perpendicular to the common longitudinal axis of the upper housing part and lower housing part and / or to the surface defined by the light emission window. It can also be provided that the cooling fins extend in the direction of the lower housing part to the upper housing part. Particularly advantageous in this case is such an embodiment of the housing, in which the cooling fins extend in the direction of the upper housing part, but this does not reach, but rather leave an open passage gap. The cooling ribs preferably extend in the direction from the housing lower part to the housing upper part no more than more than three quarters of the extent of the passage opening present in this direction. Accordingly, such housing according to the invention are of particular advantage, in which at least the majority of cooling fins, in particular all cooling fins, are not in contact with the upper housing part.

In the housing according to the invention the upper housing part and / or the lower housing part and / or at least one cooling rib, preferably made of aluminum or an aluminum alloy. Very particular preference is given to all of the abovementioned components made of aluminum or an aluminum alloy manufactured. In this case, in an advantageous embodiment, the plurality of cooling fins, in particular all cooling fins, are integral with the lower housing part. The cooling fins are expediently arranged above the lighting fixture mounted in the lower housing part and thus ensure a particularly efficient dissipation of the heat generated by the lighting fixtures.

Surprisingly, it has been found that such housing particularly well meet the application profile described above, in which the upper housing part and / or the lower housing part and / or the cooling fins by means of milling and / or after the sand, mold or die casting, in particular the AluminiumDruckgußverfahren , have been produced. Preferably, all of the above-described housing components are produced by die casting. In particular, when LEDs, for example high-power LEDs, are used with the housing according to the invention as a lighting fixture, it has proven particularly expedient to accommodate the associated power supply units in the housing upper part. In this way, a particularly compact housing design succeeds.

The housing according to the invention can also be equipped with a mounting adapter for attachment to, for example, light poles. As far as the housing according to the invention is not subject to any special design restrictions, a variety of forms of mounting adapters can be connected to the housing. In this way, it is readily possible to attach the housing according to the invention to existing light poles via said mounting adapter.

A further development of the housing according to the invention provides, in addition to equip this with at least one pipe for heat dissipation, also known as heat pipes.

The object underlying the invention is further achieved by a lamp or lamp comprising at least one housing according to the invention and at least one present in the housing lower part or, mounted lighting fixture. These may be lights or lamps for indoor as well as outdoor applications. With the luminaire according to the invention, at least preferably come as lighting fixture an LED bulb, in particular high-performance LED bulbs used. Such lighting fixtures particularly preferably comprise a multiplicity of LEDs or high-power LEDs, for example at least four or in particular at least 16 such lighting fixtures. These may be mounted on a printed circuit board (also called printed circuit board or printed circuit board), such as an aluminum board. Accordingly, a luminaire according to the invention or the associated housing according to the invention can be equipped with a multiplicity of circuit boards on which one or more lighting elements in the form of, for example, LEDs are present. Of course, lighting fixtures with at least 64 LEDs, at least 256 or at least 512 LEDs, such as high-power LEDs, mounted on one or more boards, can be installed in the housing according to the invention. For the production of suitable boards came next to eg aluminum or aluminum alloys on plastic materials, in particular based on epoxy resins are used. Particularly suitable are fillers or fibers, in particular glass fibers, provided Epoxidharzformmassen. Conveniently, sinkers which are made essentially of or on the basis of aluminum or an aluminum alloy may be provided at least in regions with at least one dielectric layer.

High-power LEDs in the sense of the present invention are in particular those LEDs which have a power consumption of at least one watt.

It has proved to be particularly advantageous that very high packing densities can be realized with the luminaires according to the invention. For example, it is possible to obtain packing densities of at least 16 LEDs, in particular high-power LEDs, per 180 cm ² or less, in particular per 150 cm ² or less, and particularly preferably per 120 cm ² or less. Moreover, it is possible to obstruct 16 LEDs, in particular 16 high-power LEDs, on an area smaller than 110 cm ² , for example 106 cm ² or less.

Of course, the emission characteristics of the lighting fixtures can also be varied in a variety of ways known to the person skilled in the art for the luminaires according to the invention. Particularly preferably, lighting fixtures, in particular LED lighting means with a Batwing radiation characteristic and very particularly preferably those with a Lambertian radiation characteristic are used. In particular, allow the latter bulbs Secondary optics with a narrow beam angle. Furthermore, at least one lighting fixture can be equipped with a primary and optionally secondary optical system. Here, the primary optical system may be a primary reflector and the secondary optical system may be a secondary reflector.

Furthermore, an expedient embodiment of the luminaire according to the invention provides that at least one LED lamp is equipped with at least one, in particular electrically insulated, heat sink.

The object underlying the invention is further achieved by a Innensowie by an outdoor lamp, such as a street lamp or a floodlight device comprising at least one inventive housing or a lamp according to the invention and a mast base or a suspension, such as a wire suspension.

The invention is based on the surprising finding that, by means of a suitable housing design, a luminous element or even a high-performance luminous body equipped with a large number of high-power LEDs can be obtained whose working temperature can be maintained even at low temperatures even in continuous operation that it requires additional cooling aid. For example, it is possible to keep the continuous operating temperature for street lamps according to the invention, which are equipped with a plurality of high-power LEDs, below 50 ° C. In this way, not only the efficiency of the lamps according to the invention can be kept constant high. The life of such filament is not adversely affected. This gives a very low maintenance lamp. In addition, the modular design of the housing according to the invention allows a simple and efficient installation. The housing design according to the invention proves to be very robust, for example against vibration. Finally, with the housing according to the invention or the luminaires according to the invention, LED illuminants can be obtained which can readily replace conventional high-current applications and thus ensure much greater electromagnetic compatibility.

Figur 1

eine perspektivische Draufsicht auf eine erfindungsgemäße Leuchte,

Figur 2

eine Draufsicht auf das Lichtaustrittsfenster des Gehäuseunterteils der Leuchte gemäß Fig. 1 und

Figur 3

eine Seitenansicht der Leuchte gemäß Fig. 1.

Further advantages, features and applications of the present invention will become apparent from the following description of a preferred embodiment in conjunction with the accompanying drawings. In these drawings show

FIG. 1

a perspective top view of a lamp according to the invention,

FIG. 2

a plan view of the light exit window of the housing base of the lamp according to Fig. 1 and

FIG. 3

a side view of the lamp according to Fig. 1 ,

FIG. 1 shows the perspective representation of a lamp 1 according to the invention with an upper housing part 2, a lower housing part 4 and an intermediate layer 6 of, for example, polyoxymethylene. The cooling fins 10 are integrally connected to the lower housing part 4. The lower housing part 4, the cooling fins 8 and the lower housing part 2 are made in this embodiment of aluminum by die casting. The upper housing part 2 and the lower housing part 4 are not in direct contact. This is ensured by acting as a thermal barrier interlayer 6. The cooling fins 10 are not in direct contact with the upper housing part 2. The cooling fins 10 are present in a through opening 8 formed by the lower housing part 4 and the upper housing part 2. This through-opening 8 extends from a first side region 14 of the housing 1 to an opposite second side region 16. Above the cooling ribs 10, preferably still a gap 30 remains. The cooling ribs 10 are oriented essentially parallel to one another and extend at approximately the same distance over the entire length as well as the entire width of the passage opening 8. The side portions 14 and 16 of the housing 1 are formed by the side walls of the upper housing part 2 and lower housing part 4 substantially. In the illustrated embodiment, there is a light exit opening 20 (not shown) on the underside of the lower housing part 4. Opposite this light exit surface, the upper housing part 2 has a housing cover 18. A fastening device 22 of the mast adapter 12 can be attached to this housing cover 18.

FIG. 2 is a plan view of the bottom or the light exit opening having side of the lamp 1 and the lower housing part 4 again. The light exit surface 20 extends substantially over the entire extent of the lower housing part 4. In the illustrated embodiment, a total of four boards 26 are shown in aluminum, which are each equipped with 16 high-power LEDs 24 in the lower housing part. Suitable high-power LEDs are, for example, those of the Lumileds type Luxeon Emitter LXHL BW 02 with a Batwing light intensity distribution.

FIG. 3 shows the lamp 1 according to the invention in side view. In addition to the already for the FIGS. 1 and 2 described elements are the FIG. 3 Passage channels 28 refer to, which may for example also be made of polyoxymethylene, and in which lines are laid from the present in the upper housing part 2 power supplies to the luminaries 26 in the lower housing part 4. So that these ducts 28 from the outset not come as possible thermal bridges in question, their execution in the form of poor thermal conductivity plastics, which are also thermally stable, has proven to be very beneficial. Becomes particularly clear in the FIG. 3 the remaining in the passage opening 8 above the cooling fins 10 gap 30. In this way, a very efficient heat dissipation succeeds.

The features disclosed in the foregoing description, in the drawings and in the claims may be essential both individually and in any combination for the realization of the invention in its various embodiments.

LIST OF REFERENCE NUMBERS

1

casing

2

Housing top

4

Housing bottom

6

Material interlayer

8th

Through opening

10

cooling fins

12

Mastadapter

14

first page area

16

second page area

18

Cover part of the upper housing part

20

Light-emitting surface

22

Fastening device of the mast adapter

24

LED light

26

circuit board

28

duct

30

gap

Claims (32)

Housing for lighting fixtures, comprising at least one upper housing part and at least one lower housing part, suitable for receiving at least one lighting fixture and containing at least one light exit window, characterized in that
the upper housing part and the lower housing part are thermally decoupled by attaching at least one intermediate layer between the upper housing part and the lower housing part, wherein the material of this intermediate layer is thermally less conductive than the material used for the upper housing part and the lower housing part, and that the upper housing part and the lower housing part are opposite forming first and second side regions, wherein at least one through opening extends from the first side region to the second side region. The housing of claim 1, further comprising
at least one duct for receiving lines extending from the upper housing part into the lower housing part, wherein this duct is made of a material which is thermally less conductive than the material used for the upper housing part and the lower housing part. Housing according to claim 1 or 2, characterized in that
the material for the intermediate layer and / or the conduit channel comprises a plastic material, in particular a polyalkylene oxide and / or a styrene (co) polymer. Housing according to claim 3, characterized in that
the material for the intermediate layer and / or the conduit channel polyoxymethylene (POM) and / or isotactic polystyrene. Housing according to one of the preceding claims, characterized in that protrude into the through-hole a plurality of spaced cooling fins which are at least partially thermally coupled to the housing lower part. Housing according to claim 5, characterized in that
the cooling fins are predominantly aligned substantially parallel. Housing according to claim 5 or 6, characterized in that
the plurality of cooling fins extend from the first side region to the second side region. Housing according to one of claims 5 to 7, characterized in that
the cooling fins are aligned substantially perpendicular to the common longitudinal axis of the upper housing part and the lower housing part and / or to the surface defined by the light emission window. Housing according to one of claims 5 to 8, characterized in that
the cooling fins extend in the direction from the lower housing part to the upper housing part. Housing according to claim 9, characterized in that
at least the majority of the cooling fins or all the cooling fins are not in contact with the housing upper part. Housing according to one of the preceding claims, characterized in that the upper housing part and / or the lower housing part and / or at least one cooling rib are made of aluminum or an aluminum alloy. Housing according to one of claims 5 to 11, characterized in that
the plurality of cooling fins or all cooling fins are integral with the lower housing part. Housing according to one of the preceding claims, characterized in that the upper housing part and / or the lower housing part and / or the cooling ribs are produced by means of milling and / or by the sand, mold or die casting method. Housing according to one of the preceding claims, characterized by
at least one power supply in the upper housing part. Housing according to one of the preceding claims, further comprising
a mounting adapter for attachment to light poles. Housing according to one of the preceding claims, further comprising
at least one pipe for heat dissipation (heat pipe). Housing according to one of the preceding claims, characterized in that the lighting fixture is a high-power LED lighting fixture. Luminaire, comprising at least one housing according to one of the preceding claims and at least one light source present in the housing lower part. Luminaire according to claim 18, characterized in that
the lighting fixture comprises at least one LED lamp, in particular high-power LED lamp. Luminaire according to claim 18 or 19, characterized in that
the lighting fixture comprises at least four, in particular at least 16, LEDs, in particular mounted on at least one printed circuit board. Luminaire according to one of claims 18 to 20, characterized in that the lighting fixture comprises at least 64 LEDs, in particular mounted on at least one circuit board. Luminaire according to claim 21, characterized in that the lighting fixture comprises at least 256, in particular at least 512, LEDs, in particular mounted on at least one circuit board. Luminaire according to one of claims 20 to 22, characterized in that
the board is made essentially of or on the basis of aluminum or an aluminum alloy or of a plastic material, in particular of or based on epoxy resins. Luminaire according to one of claims 18 to 23, characterized in that
at least one lighting fixture is equipped with a primary optical system or with a primary and a secondary optical system. Luminaire according to claim 24, characterized in that
the primary optical system comprises a primary reflector and the secondary optical system comprises a secondary reflector. Luminaire according to one of claims 18 to 25, characterized by
a packing density of at least 16 LEDs, in particular 16 high-power LEDs, per 180 cm ² or less, in particular per 110 cm ² or less. Luminaire according to one of claims 18 to 26, characterized in that
the lighting fixture, in particular the LED lamp, has a Batwing or Lambertian emission characteristic. Luminaire according to one of claims 18 to 27, characterized in that
at least one LED lamp is equipped with at least one, in particular electrically insulated, heat sink. Luminaire according to one of claims 23 to 28, characterized in that
the board is essentially made of or on the basis of aluminum or an aluminum alloy at least partially provided with at least one dielectric layer. Street lamp, comprising at least one housing according to one of claims 1 to 17 and / or at least one lamp according to one of claims 18 to 29 and a mast base or a cable suspension. Floodlight device comprising at least one housing according to one of claims 1 to 17 and / or at least one luminaire according to one of claims 18 to 29 and a mast base or a cable suspension. Use of a housing according to one of claims 1 to 17 or a luminaire according to one of claims 18 to 29 for street lamps, floodlights or explosion-proof lamps.

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