DE102004015561A1 - Lamp for a fluorescent tube has a closed casing translucent on a radiating side for holding the fluorescent lamp/tube mounted in the casing's end parts with caps mounted on a front side - Google Patents

Abstract

A thermal collar (4) surrounds a fluorescent lamp/tube with a preset clearance and borders on a translucent casing's (3) end parts (2). The axial length of the thermal collar is designed so that the area of the lengthwise stretch of the fluorescent lamp's inner electrodes is covered over.

Description

The The invention relates to a luminaire with a closed, at least on the emission side translucent housing for receiving at least one end capped in housing end parts held and contacted fluorescent lamp.

to shine These types are known and used in practice in many ways used both indoors and outdoors. It is also known that in these lights, depending on the environmental conditions, especially at lower temperatures a noticeable loss of luminous flux can already occur what is already for Lighting applies, for example, used in railway stations, car parks and the like are, where quite temperatures in the range of + 30 ° C to -30 ° C depending can occur from the respective season.

The Extent of ascertainable luminous flux loss can depend on the type of Assembly of the Luminaires used fluorescent lamps be dependent.

From the DE 40 12 588 C2 a luminaire for low ambient temperatures is known, which is preferably used in cold stores and in which the respective fluorescent lamp surrounded by a plurality of concentric tubes formed by air layers and between the adjacent layers of air such a narrow air gap is formed that virtually no heat resistance affecting gas flows between can adjust the adjacent air layers. Although this known lamp assembly is for special applications, such as cold room light, advantageously used, but associated with a corresponding effort and thus comparatively high production costs.

task The present invention is a luminaire of the initially mentioned Art in such a way that on the one hand at low temperatures occurring undesirable Luminous flux losses are at least largely avoided and the other measures provided for this purpose are not detrimental Effects on luminaire operation or normal efficiency or higher Temperatures have, with the measures to be taken simultaneously only one require minimal design and material overhead allowed to.

Is solved this object according to the invention essentially in that adjacent to the housing end parts in each case one the fluorescent lamp with a predeterminable distance enclosing thermal sleeve is provided, whose axial length is dimensioned so that at least the region of the longitudinal extent the inner electrodes of the respective fluorescent lamp covered is.

By the at both housing end parts provided thermal sleeves and their design or Sizing is done at a minimal, essentially on the Use of two short pipe sections limiting effort achieved that especially in connection with T5 fluorescent lamps of 16 mm diameter the previously unavoidable at low temperatures light losses and possibly also occurring malfunctions as far as possible eliminated can be.

By the both ends provided thermal sleeves will also be a complete independence achieved by the respective assembly of the fluorescent lamp, because it is always ensured that the electrodes of the fluorescent lamp located in the area of a thermal sleeve. Lamp replacement can therefore be carried out without problems and without observing special installation instructions.

The Length of respective thermal sleeve is preferably in dependence from the wattage, i. the lamp power, so chosen that the stamp side on the fluorescent lamp associated longer inner electrode of the fluorescent lamp covered by the thermal sleeve. As a result of this Demand arise in connection with T5 fluorescent lamps for thermal sleeve lengths in the Range of about 60 to 100 mm.

Of the radial distance between the respective fluorescent tube and the associated Thermal sleeve is dependent to choose from the internal volume of the closed housing, with different Volume a change This radial distance is provided. The optimal effects of Thermal sleeve are thus based on a possibly by experiments to be determined vote of the volume between the fluorescent tube and Thermal sleeve on the one hand and the volume of the closed housing on the other.

To the Purposes of simplification and facilitation of assembly and / or Replacement of the respective fluorescent lamp is the free end the thermal sleeve preferably in the manner of an introduction aid formed, this particular funnel-shaped introduction guide executed as a separate component may be that with the thermal sleeve conveniently by clamping coupling is connectable.

Although the thermal sleeve could be integrally formed with the housing end portion, but preferably the thermal sleeve on the respective housing end portion is detachable, in particular via a Clamp guide, held.

Regarding the choice of material of the thermal sleeve provides a high degree of freedom, and it may, for example, consist of a temperature-resistant, especially clear plastic material, one with a thermal radiation reflective material coated plastic part or too Made of metal.

To a further embodiment can for Purpose of optimizing the thermal sleeve at least in Area of one of its ends querschnittsverringernde elements for Specification of a permissible Air exchange with the housing interior exhibit. These cross-sectional reducing elements are preferably integrally formed on the thermal sleeve or by deformation the thermal sleeve formed.

The in already mentioned Way preferably with T5 fluorescent lamps, in particular 16 mm in diameter used thermal sleeves can be used with all types of covers, regardless of whether it is mirrored or mirrored in a predeterminable way Covers acts.

The The invention will be explained in more detail below with reference to the drawing, wherein the single figure of the drawing in perspective view one End portion of a lamp according to the invention shows, the other end is formed in a similar manner.

According to the drawing, the lamp shown comprises a suitable for ceiling or wall side solidification carrier housing 1 , which is used to hold ballasts, cables and the like and on the end parts 2 a translucent housing 3 is held.

The free ends of the housing 3 are preferably sealing in a formally adapted groove of the respective end parts 2 recorded so that the two end parts 2 and the case 3 set a closed space.

In the illustrated embodiment, the housing 3 formed for receiving a fluorescent lamp, but it goes without saying that by appropriate housing dimensioning and a receiving space for a plurality of fluorescent lamps, which are parallel to each other, can be created.

The end parts 2 are provided with passage openings for the respective double ended fluorescent lamp, which is contacted in the region of the end parts.

According to the invention is adjacent to each end part 2 and the passage opening for the fluorescent lamp, a thermal sleeve 4 provided, which has a predeterminable radial distance from the fluorescent lamp and extending over a likewise predeterminable length portion of the fluorescent lamp, not shown in the drawing.

The thermal sleeve 4 could in principle be in one piece with the end part 2 be formed, but preferably and as shown in the drawing, it is in the thermal sleeve 4 around a separate part, that with respect to the end part 2 by means of several distributed around the circumference holding elements 6 is fixed, which is the thermal sleeve 4 hold clamped.

Preferably, at the free end of the thermal sleeve 4 an introductory aid 5 intended for the fluorescent lamp. Such an introduction aid 5 For example, it may be funnel-shaped, have guide ribs on the inside and clamped to the thermal sleeve 4 be connected.

By the use of a comparatively short pipe section existing and thus requiring only a small amount of material Thermal sleeves are possible especially with T5 fluorescent lamps of preferably 16 mm diameter, in the range of the function of the fluorescent lamp at different and in particular low temperatures critical electrodes a largely temperature-stable Zone or a not exposed to strong temperature fluctuations Create a zone that, surprisingly, enables the functionality the fluorescent lamp in a wide temperature range and in particular also in a range of lower temperatures to ensure and disturbing light losses to avoid.

While the radial distance between the fluorescent lamp and the thermal sleeve 4 is preferably selected as a function of the volume between the housing 3 and the end parts 2 is enclosed, the axial length of the thermal sleeve depends on the power or wattage of the respective fluorescent lamp and is preferably taking into account the different wattages in the range of 60 to 100 mm.

It is important that the longer inner electrode of the fluorescent lamp is covered by the thermal sleeve. The position of the longer inner electrode is marked in the case of fluorescent lamps, in particular in the case of the T5 fluorescent lamp, by means of a stamp imprint provided on an end region of the fluorescent tube. In particular, reference is made in this connection to the Appropriate marking of T5 fluorescent tubes from Osram.

Although in the drawing is a continuous translucent housing 3 shown, but this case 3 can also - as is known in principle - be mirrored in a predeterminable manner.

The Thermo sleeves preferably consist of a likewise translucent Plastic material, since they optically virtually impossible in this way but it can also be used in certain applications be advantageous to realize thermal sleeves, which are made of special coated plastic material or also made of metal.

To mention is also that through the solubility the thermal sleeves the basic version with and without Thermal sleeve can be used and thus a equipment of lights with thermal cuffs easily and quickly possible if this requires the special purpose.

1

support housing

2

end

3

trans lucentes casing

4

Thermo collar

5

introduction Help

6

supporting member

Claims (13)

Luminaire with a closed, at least radiating side translucent housing for receiving at least one end capped, held in the housing end portions and contacted fluorescent lamp, characterized in that adjacent to the housing end portions ( 2 ) in each case one the fluorescent lamp with a predeterminable distance enclosing thermal sleeve ( 4 ) is provided, whose axial length is dimensioned so that at least the region of the longitudinal extent of the inner electrodes of the respective fluorescent lamp is covered. Luminaire according to claim 1, characterized in that the length of the Themanzschette ( 4 ) is selected as a function of the wattage so that the with respect to their positioning of the stamp page on the fluorescent lamp associated longer inner electrode of the fluorescent lamp is covered. Luminaire according to claim 2, characterized in that the length of the thermal sleeve ( 4 ) is selected in the range of 60 to 100 mm depending on the wattage. Luminaire according to one of the preceding claims, characterized in that the fluorescent lamps used are T5 lamps, which on one side have two different lengths of internal electrodes. Luminaire according to one of the preceding claims, characterized in that the radial distance between the fluorescent tube and thermal sleeve in dependence on the internal volume of the closed housing ( 3 ) is selected, with a different volume, a change in the radial distance is provided. Luminaire according to one of the preceding claims, characterized in that the free end of the thermal sleeve ( 4 ) in the form of an introductory aid ( 5 ) is designed for the fluorescent lamp. Luminaire according to claim 6, characterized in that the preferably funnel-shaped insertion aid ( 5 ) of the thermal sleeve ( 4 ) is designed as a separate, can be coupled with the thermal sleeve component. Luminaire according to one of the preceding claims, characterized in that the thermal sleeve ( 4 ) at the respective housing end part ( 2 ) detachable, in particular via a clamping guide ( 6 ) is held. Luminaire according to one of the preceding claims, characterized in that the thermal sleeve ( 4 ) consists of a temperature-resistant, especially crystal-clear plastic material. Luminaire according to one of the preceding claims, characterized in that the thermal sleeve ( 4 ) consists of a plastic part coated with a heat radiation reflecting material. Luminaire according to one of the preceding claims, characterized in that the thermal sleeve ( 4 ) consists of metal. Luminaire according to one of the preceding claims, characterized in that the thermal sleeve ( 4 Has at least in the region of its free end querschnittsverringernde elements for specifying a permissible air exchange with the housing interior. Luminaire according to one of the preceding claims, characterized in that the thermal sleeves used in conjunction with T5 fluorescent lamps ( 4 ) in combination with all Va variants of closed, non-mirrored and, to a certain extent, mirrored covers ( 3 ) can be used.