EP2085691B1 - Lamp - Google Patents

Abstract

The lamp has a reflector (13) forming a retaining area (15) for a lighting unit, and a base part (17) and a housing (11) connected to the reflector. A container (47) accommodating a ballast and an air conducting wall (23) screening the container against the disturbing heat effect are arranged in the housing, in such a manner that a flow channel (25) projecting in the direction of an air outlet opening (29) is formed between the housing and the air conducting wall. The flow channel remains in flow connection with the retaining area over an air inlet opening (27) formed in the base part.

Description

The present invention relates to a luminaire, in particular a suspended luminaire, having a reflector forming a receiving space for a luminous means, a bottom part and a housing adjoining the reflector at the bottom, at least partially engaging in the housing an electronic component, in particular a ballast receiving receptacle and at least one of the container against disturbing heat radiation shielding Luftleitwandung is provided and between the housing and the Luftleitwandung a tapering in the direction of an air outlet opening flow channel is formed.

Illuminants of any kind do not convert a considerable part of the power consumed by them into light but into heat, so that the luminaires carrying the illuminants become correspondingly hot. When using bulbs of high power, the temperature of the housing of the luminaire of the type mentioned can reach values that lead to the failure or destruction of housed in the housing temperature-sensitive electronic components. This applies, for example, to a ballast which offers the possibility of dimming a high-pressure gas discharge lamp or regulating its power as a function of the brightness of the ambient light. In known luminaires, such electronic components are therefore arranged at a sufficient distance from the housing. This has an additional installation effort result and also leads to an aesthetically unsatisfactory appearance. Furthermore, it may be due to of long line lengths between the electronic components and the luminaire also come to malfunction.

A lamp of the type specified is from the US 2006/232984 A1 , Paragraphs [0010] - [0014], [0088] and Figure 23 are known. In this known lamp, the reflector space limiting bottom part is formed by the bottom wall of the engaging in the housing container. An outer collar surrounds the reflector and is configured so that heated air from the interior of the reflector can be dissipated through openings to the outside and at the same time prevents leakage of light through the openings as possible. An annular flange forms a component of the outer collar and in this flange openings are provided which allow the escape of heated air. The outer collar is connected via the flange to the housing. Tapered flow channels are formed between the flange and the outer collar.

From the WO 2004/018934 A1 a recessed luminaire is known in which a substantially U-shaped holder for a transformer is inserted into the end region of the luminaire housing. The side walls of the U-shaped brackets extend obliquely up to the respective housing wall and are provided with a plurality of air passage openings, which serve for ventilation purposes.

Object of the present invention is to provide a luminaire of the type mentioned, which makes it possible to arrange electronic components even when using bulbs of high power in the housing.

This object is essentially achieved in that two diametrically opposed Luftleitwandungen to form flow channels between the Luftleitwandungen and the inner wall of the housing are provided in the housing and the flow channels via at least one formed in the bottom part air inlet opening in flow communication with the receiving space, and that the container is held in the free space between and at a distance from the two diverging Luftleitwandungen.

In particular, for the case that a light source is used with very high power, it is advantageous if at least one cold air duct is provided between each flow channel and the container receiving the electronic components whose at least one inlet opening formed in the housing and the outlet opening in the outflow of the one Suction effect in the cold air duct causing heated air of the associated flow channel is located. On the one hand, this causes a further cooling of the heated air emerging from the flow channel. On the other hand, the cold air duct is a kind of cooling jacket for the container receiving space.

Further advantageous embodiments and features of the invention are specified in the dependent claims and / or will be explained below in connection with the description of two embodiments.

Fig. 1

eine aufgebrochene Perspektivansicht einer Hängeleuchte gemäß einer ersten Ausführungsform der Erfindung,

Fig. 2

eine Darstellung der Hängeleuchte aus Fig. 1 von unten,

Fig. 3

einen Ausschnitt aus einer Draufsicht auf die Hängeleuchte von Fig. 1, und

Fig. 4

einen Axialschnitt durch eine Hängeleuchte gemäß einer zwei- ten Ausführungsform der Erfindung.

They show, in each case in a schematic representation,

Fig. 1

1 is a broken perspective view of a suspension lamp according to a first embodiment of the invention,

Fig. 2

a representation of the hanging lamp Fig. 1 from underneath,

Fig. 3

a detail of a top view of the pendant of Fig. 1 , and

Fig. 4

an axial section through a pendant lamp according to a second embodiment of the invention.

In Fig. 1 a pendant lamp is shown with a cylindrical housing 11 made of stainless steel, at the lower end of a cup-shaped reflector 13 connects, which forms a receiving space 15 for a non-illustrated illuminant and which is supported on a separately formed bottom plate 17 on the housing 11. Through the center of the bottom plate 17 extends through a bulb holder 19, which extends into the receiving space 15 and into which the light source for the lamp, for example a high-pressure gas discharge lamp, can be screwed.

The bulb holder 19 is supported on the reflector 13 opposite side of the bottom plate 17 on a housing-fixed support member 55 to which an air guide 21 is fixed, which is formed as a U-shaped angle plate. The two with respect to a housing axis 31 ( Fig. 2 ) opposite leg surfaces of the angle plate each form a substantially planar Luftleitwandung 23 and are connected to each other via a parallel to the bottom plate 17 extending base wall 51.

The support member 55 is welded to the underside of the base wall 51, holds the bulb holder 19 and is further bolted to the housing 11. In addition, two bolts are attached to the support member 55, which extend in the direction of the reflector 13 and which serve to hold the bottom plate 17.

The Luftleitwandungen 23 and the base wall 51 abut with their lateral boundary edges respectively on the inner wall of the housing 11. In principle, however, it is also possible that the Luftleitwandungen 23 and / or the base wall 51 are arranged slightly spaced from the inner wall of the housing 11.

The Luftleitwandungen 23 extend at an acute angle to the housing axis 31 obliquely upward and are inclined towards the outside to the housing 11, so that between the Luftleitwandungen 23 and the housing 11, tapered flow channels 25 are formed. The cross section of the flow channels 25 is thereby reduced along the housing axis 31 in the flow direction by more than 50% in each case. The two flow channels 25 may be at their lower ends, i. in the region of the bottom plate 17 and the base wall 51, fluidly connected to one another or else be separated from each other.

The bottom plate 17 has in the region of the flow channels 25 each have a group of air inlet slots 27 ( Fig. 2 ), through which the flow channels 25 are respectively fluidly connected to the receiving space 15 for the lighting means. At their upper end, the flow channels 25 each pass into an air outlet opening 29 (FIG. Fig. 3 ). The respective air outlet opening 29 is bounded by the end of the respective Luftleitwandung 23 and the respective Luftleitwandung 23 opposite housing.

Between the two flow channels 25 a lying within the housing 11 space 33 is provided in the distance to the two Luftleitwandungen 23 a particular flat-square ballast 35 is received for a high-pressure gas discharge lamp. The ballast 35 is housed in a container 47 for this purpose. The container 47 dives only partially into the free space 33. In addition, the container 47 is radially beyond the housing 11 with its two lateral ends. This is made possible by two diametrically opposite, formed in the housing 11 recesses into which the container 47 engages without contact. With further miniaturization, a container can be used which finds a total space within the housing.

The air guide 21 is connected via two support elements 49, of which in Fig. 1 only one is recognizable, connected to the container 47, via which the suspension of the suspension can be done. Each of the two support members 49 is formed as a threaded tube, on which a spacer sleeve is pushed, which extends between the container 47 and the base wall 51, wherein the fixation of the container 47 and the Luftleitteils 21 takes place on each other screwed onto the ends of the threaded tube nuts , Within at least one of the threaded tubes run the electrical leads for the lamp.

The above based on the Fig. 1 to 3 Hanging lamp described is at least substantially mirror-symmetrical design.

In operation, heated by the light source in the receiving space 15 of the reflector 13 heated air due to the there formed hot air accumulation through the air inlet slots 27 in the two flow channels 25th There, the heated air flows due to the upwardly tapering cross-section of the two flow channels 25 continues to accelerate around the two flow channels 25 through the both sides of the ballast 35th and at this spaced-apart air outlet openings 29 to leave again. Since the heated air has a low static pressure due to its speed, it also comes to a rapid mixing with cooler ambient air and appropriate air discharge. Since the Luftleitwandungen 23 and the base wall 51 rest against the inner wall of the housing 11 or are arranged only slightly spaced therefrom, penetrates little or little heated air into the free space 33, in which the ballast 35 is received.

Due to the above-described construction, the ballast 35 is optimally protected against disturbing heating.

For the pendant lamp according to Fig. 4 is provided in addition to the air guide 21, which is used to form the flow channels 25, which can be regarded as a first cooling stage, another air guide 37 with two leg surfaces or Luftleitwandungen 39 and a base wall 53. The further air guide part 37 is formed at least substantially identically to the air guide part 21 and arranged downstream of it in the flow direction. The Luftleitwandungen 39 and the base wall 53 of the further Luftleitteils 37 are located with their lateral boundary edges on the housing inner wall or may be arranged slightly spaced from the housing inner wall.

As a result, two diametrically opposed cold air ducts 41 are created between the ballast 35 receiving container 47 and the flow channels 25 through the first air guide 21 and the other air guide 37. The cold air ducts 41 represent a second cooling stage, which is connected downstream of the first cooling stage in a cascade.

The cold air channels 41 are divided into the housing 11 formed cold air inlet slots 43, which in Fig. 4 can be seen in the form of dashed lines. The two cold air channels 41 are connected to one another at their lower ends in the area of the cold air inlet space located between the base wall 51 and the base wall 53. In principle, however, it is also conceivable that at least one separate cold air inlet slot is provided for each of the two cold air ducts 41 and the two cold air ducts 41 are fluidically separated from one another.

The air inlet slots 27 of the flow channels 25 are in the view in Fig. 4 arranged on both sides of the housing axis 31. The cold air inlet slots 43 of the cold air channels 41 are in the view in Fig. 4 arranged in front of the housing axis 31. The air inlet slots 27 are therefore offset in the circumferential direction of the housing 11 relative to the cold air inlet slots 43 each by 90 °.

Furthermore, the cold air ducts 41 each have a cold air outlet opening 45 which lie in the outflow region of the respective associated flow duct 25. The cold air outlet opening 45 of each cold air channel 41 is bounded by the end of the Luftleitwandung 23 of the associated flow channel 25 and the end of the further Luftleitwandung 39 of the cold air duct 41. The mutual distance of the ends of the Luftleitwandungen 23, 39 of the flow channel 25 and cold air channel 41 in the flow direction is greater than the distance between the Luftleitwandungen 23, 39 of the channels 29, 41 in the direction of a normal to the Luftleitwandungen 23, 39.

In contrast to the suspension lamp according to the Fig. 1 to 3 takes place according to the hanging lamp Fig. 4 in addition a cold air intake instead. The cold air is heated by the ascending in the flow channels 25 Air in the manner of a Venturi nozzle or water jet pump thereby sucked from outside the housing 11 through the cold air inlet slots 43 and through the cold air channels 41 to be mixed in the outflow of the flow channels 25 with the heated air from the flow channels 25. Here, the cold air channels 41 create a barrier of cold air, which effectively prevents heat transfer from the heated air flowing through the flow channels 25 to the ballast 35.

Due to the advanced structure according to Fig. 4 For example, the ballast 35 can be better protected against excessive heating.

In principle, it is possible that further cooling stages are provided in the manner of the second cooling stage, in which case each further cooling stage of the respective preceding cooling stage is connected downstream according to the type described above. This is particularly advantageous in the case of further increasing power of the lighting means and an associated increased need for cooling or heat dissipation.

LIST OF REFERENCE NUMBERS

11

casing

13

reflector

15

Recording room for a light source

17

ground

19

Lamp holder

21

air guide

23

air guide

25

flow channel

27

Air inlet slot

29

Air outlet opening

31

housing axis

33

free space

35

ballast

37

another air guide

39

further air duct wall

41

Cold air duct

43

Cold air inlet slot

45

Cold air outlet opening

47

container

49

supporting member

51

base wall

53

another base wall

55

support part

Claims (11)

1. A lamp, in particular a hanging lamp having a reflector (13) forming a receiving space (15) for a lighting means, a base part (17) and a housing (11) adjacent to the base side of the reflector (13), wherein a container (47) receiving electronic components, in particular a ballast and which at least partially engages the housing (11) and at least one air guiding wall (23) shielding the container (47) from interfering effects of heat are provided and a flow passage (25) tapering in the direction of an air exit opening (29) is formed between the housing (11) and the air guiding wall (23),
   characterized in that
   two diametrically opposed air guiding walls (23) are provided in the housing (11) for the formation of flow passages (25) between the air guiding walls (23) and the interior wall of the housing (11), and the flow passages (25) are in flow connection with the receiving space (15) via at least one air inlet opening (27) formed in the base part (17) and in that the container (47) is supported in the free space (33) between and spaced apart from the two diverging air guiding walls (23).
2. A lamp in accordance with claim 1 characterized in that the air guiding walls (23) are formed by the two limb surfaces of an air guiding part (21) which in an axial section is at least substantially U-shaped or V-shaped, in particular is formed by an angled sheet metal part, wherein the lateral boundary edges of these limb surfaces end in close proximity to the housing wall or at least partially abut there.
3. A lamp in accordance with claim 2 characterized in that the container (47) is fixedly connected to a base wall (51) connecting the two limb surfaces (23) via at least one support element (49), wherein the support element (49) is preferably formed from a pipe stub simultaneously serving for the lead guidance.
4. A lamp in accordance with one of claim 2 or claim 3 characterized in that at least one support part (55) connected at the housing (11) is connected to the air guiding part (21).
5. A lamp in accordance with claim 4 characterized in that the support part (55) is formed for the holding of a lighting means socket (19) passing through the base part (17).
6. A lamp in accordance with any one of the preceding claims characterized in that at least one cool air passage (41) is provided between each flow passage (25) and the container (47) receiving the electronic components whose at least one inlet opening (43) is formed in the housing wall and whose exit opening (45) is situated in the exit flow region of the heated air of the associated flow passage (25) causing a suction action in the cool air passage (41).
7. A lamp in accordance with claim 6 characterized in that each cool air passage (41) is formed by the air guiding wall (23) associated with the flow passage (25) and a further air guiding wall (39) spaced apart therefrom and at least substantially parallel thereto.
8. A lamp in accordance with claim 7 characterized in that the air exit opening (29) of the flow passage (25) is bounded by the end of the associated air guiding wall (23) and the housing wall opposing this and the cool air exit opening (45) is bounded by the ends of the air guiding walls (23, 39) of the flow passage (25) and cool air passage (41).
9. A lamp in accordance with claim 8 characterized in that the mutual vertical separation of the ends of the air guiding walls (23, 39) of the flow passage (25) and the cool air passage (41) is larger than the normal spacing between the air guiding walls (23, 39) of the passages (25, 41).
10. A lamp in accordance with any one of the claims 6 to 9 characterized in that the cool air inlet opening (43) and the air inlet opening (27) of the flow passage (25) are offset from one another in the circumferential direction of the housing (11).
11. A lamp in accordance with any one of the preceding claims characterized in that the base part (17) is formed as a part separate from the reflector and is formed as the reflector support.

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