EP0409757B1 - Apparatus for ventilation and cooling of a housing support of an emitter - Google Patents

Abstract

Device for ventilation and cooling of a housing support of at least one emitter, in particular a UV emitter, the said emitter being in the form of a rod disposed substantially at the focus of a reflector constituted on the one hand by two longitudinal reflective walls disposed facing each other and on the other hand by a longitudinal reflecting shield partially masking the junction space between two walls of a same reflector, the adjacent walls of two reflectors joining each other in a V-shaped sector, characterised in that it consists in one or more perforated air tubes (7) for the distribution of cooling air connected at their respective ends by ducts forming collectors, the said tube or tubes being substantially parallel to the emitting rod or rods and being disposed outside the reflectors (5), their axes being substantially in the same plane as the emitting rods.

Description

The subject of the present invention is a ventilation and cooling device for a cassette supporting at least one transmitter, in particular UV, said transmitter being in the form of a rod placed substantially at the focus of a reflector consisting of a part of two longitudinal reflective walls arranged opposite and the other part of a longitudinal reflecting shield partially masking the junction between two walls of the same reflector, the neighboring walls of two contiguous reflectors joining in a sector in V.

Cassettes of this type are already known and have for example been the subject of patent issued EP 0 127 496 in the name of the applicant.

Cassettes of this type generally have a thickness close to 200 mm.

Ventilation is ensured by a conventional fan placed on the back of the cassette.

For certain specific applications, such as for example printing dryers on paper or on canvas, the cassettes cannot have a thickness greater than approximately 65 mm. Such a thickness no longer allows the use of a fan which, in any event, would cool only a small part of the elements of the cassette.

It is therefore necessary to propose a specific ventilation and cooling device for the UV emitter support cassettes which allows normal use thereof.

According to the invention, this result is obtained with a ventilation and cooling device for a cassette supporting at least one transmitter, in particular UV, said transmitter being in the form of a rod placed substantially at the focus of a reflector consisting on the one hand of two longitudinal reflecting walls arranged opposite and on the other hand of a reflecting longitudinal shield partially masking the junction between two walls of the same reflector, the neighboring walls of two contiguous reflectors joining in a V-shaped sector, characterized in that it consists of one or more perforated cooling air distribution tubes connected at their respective ends by ramps forming collectors, the said tube or said tubes being substantially parallel to the one or more emitting rods and being arranged outside the reflectors, their axes being substantially in the same plan as those of the transmitting rods.

Thanks to other modifications to the cassettes and transmitters, which will be explained below, the ventilation can be further optimized.

The invention will be better understood with the aid of the description given below of an embodiment given by way of nonlimiting example, with reference to the appended drawing which is a cross-sectional view of a cassette. according to the invention.

The cassette, generally referenced (1), essentially comprises a frame (2) and a cover (3).

• des cannes émettrices UV (4) ;
• des réflecteurs (5)
• des boucliers (6)

Inside the cassette are housed:

• UV emitting rods (4);
• reflectors (5)
• shields (6)

This structure is strictly identical to that of EP 0 127 496 and will not be described in more detail.

According to the invention, ventilation and cooling are provided by a plurality of perforated tubes (7), mutually parallel and parallel to the rods.

These tubes can be of any section, for example cane, circular, rectangular, oval, etc.

• entre le bouclier et le réflecteur correspondant pour venir lécher l'émetteur par le dessus ;
• à la base extérieure des réflecteurs qui seront à cette fin munis de perforations par exemple au sommet (8) du V ou au bas (9) du réflecteur pour les portions longitudinales latérales ;
• au travers du couvercle (3) par des orifices (10) ménagés dans celui-ci.

Ventilation will take place through all possible routes, namely:

• between the shield and the corresponding reflector to come and lick the transmitter from above;
• at the outer base of the reflectors which will be provided for this purpose with perforations, for example at the top (8) of the V or at the bottom (9) of the reflector for the longitudinal side portions;
• through the cover (3) by orifices (10) formed therein.

The ventilation between the shield and the reflector also has the function of maintaining an anti-pollution pressure above the treated products.

The ventilation in the tubes (7) will be pressurized with adjustable flow rates, cane by cane. The air from the rods comes from a support ramp, not shown, and is evacuated on the radiating face of the cassette as on the back of the latter. The air is then taken upstream and downstream of said cassette by usual extraction means (2) to be evacuated or recycled. There is of course balancing of the streams and pressures in order to avoid any rise or fall in temperature which is asymmetrical.

Claims (5)

1. A ventilation and cooling device for a cartridge supporting at least one emitter, in particular a UV emitter, said emitter being in the form of a rod arranged substantially at the focal point of a reflector consisting, on the one hand, of two longitudinal reflective walls arranged facing each other and, on the other hand, of a longitudinal reflecting shield partially masking the gap joining two walls of a same reflector, the neighboring walls of two adjacent reflectors meeting in a V-shaped sector, which device consists of one or more perforated cooling air-distribution tubes (7) connected at their respective ends by inclined plates forming collectors, said tube or tubes being substantially parallel to the emitting rod or rods and being arranged outside the reflectors (5), their axes being substantially in the same plane as the emitting rods.
2. The device as claimed in claim 1, wherein the tubes (7) are parallel to each other and parallel to the emitting rods (4).
3. The device as claimed in either of claims 1 and 2, wherein the tubes have a square, circular, rectangular or oval cross-section.
4. The device as claimed in any one of claims 1 to 3, wherein the ventilation takes place:

   - between the shield and the corresponding reflector in order to lap against the emitter from above;

   - at the outer base of the reflectors which will, for this purpose, be provided with perforations, for example at the peak (8) of the V or at the bottom (9) of the reflector for the lateral longitudinal portions;

   - through the cover (3) by way of orifices (10) provided in the latter.
5. The device as claimed in any one of claims 1 to 4, wherein the ventilation in the tubes (7) is pressurized at rates which can be adjusted for each rod.

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