Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1989-08-16
1990-11-06
Leung, Philip H.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
219349, H05B 302
Patent
active
049688715
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an infrared radiating element, hereinafter referred to generally as an IR-radiator.
Prior art IR-radiators of this kind comprise, in the main, a body structure on which there is supported one or more IR-lamps, each with a rearwardly located reflector. Several such IR-radiators my be incorporated in a common body structure. The body structure has hollows or cavities provided therein, for accommodating cooling and ventilating air, i.e. longitudinally extending hollows located beneath respective reflectors and transversally extending hollows and/or terminal communication hollows or channels for the supply and discharge of ventilation air. The hollows or cavities etc. of these known IR-radiators, however, are unsuitably configured and do not therefore provide an effective and uniform cooling effect. This applies paricularly to the region in which reflector and lamp lie in close proximity with one another. This region of the IR-radiator is not readily reached by the cooling air flows and since most of the heat generated is produced in this region of the radiator, the region is an immediate dimensioning factor with regard to the maximum amount of energy that can be taken out from the IR-radiator.
Accordingly, the object of the present invention is to provide an improved IR-radiator in which the ventilating and cooling air flows will act effectively on all parts of the reflector and on the IR-lamp, and which will have a higher maximum power output then known radiators of this kind, and generally constitute a step forward in the art.
To this end there is provided in accordance with the invention an infrared radiator of the aforesaid kind. Thus, because of the particular configuration of the inventive IR-radiator, cooling air will flow advantageously over the surfaces of the reflector.
According to one particularly advantageous embodiment of the invention, the ventilation hollows are configured in a manner to guide the ventilation air flows along the lower or front surfaces and in between reflector and the IR-source, thereby effectively cooling the hottest part of the IR-radiator.
The invention will now be described with reference to non-limiting and exemplifying combinable embodiments of the invention and with reference to the accompanying drawings, in which
FIG. 1 illustrates a first embodiment of the invention;
FIG. 2 is a sectional view taken on the line II--II in FIG. 1;
FIG. 3 illustrates a second embodiment of the invention;
FIG. 4 is a sectional view taken on the line IV--IV in FIG. 3;
FIG. 5 illustrates a third embodiment of the invention; and
FIG. 6 is a sectional view taken on the line VI--VI in FIG. 5.
FIGS. 1 and 2 are different sectional views of an infrared radiator of modular construction. Connected to both sides of illustrated IR-radiator are further IR-radiators, which may be of the same or a different kind. The illustrated IR-radiator comprises a body structure 10 having a cross-web 12, a central leg 14, two side legs 16 and two intermediate support legs 18. The central leg and the side legs each incorporate respective slots 20 and projections 22 for the attachment of a reflector 24. The reflector may be of any design kind, but will preferably comprise gold-coated, flexible metal foil. Gold has the best reflective properties and the greatest resistance to corrosion and is therefore used when particularly high radiation powers are desired. Located in front of each reflector is a respective IR-lamp 26 (not shown in detail) which comprises a lamp glass 28 and a helically configured filament 30.
The reflector 24 is caused to abut the side of the side legs 16, the free end surfaces 32 of the support legs 18 and against bearing or abutment surfaces 34 on the central leg 14. This arrangement of the reflector abutment surfaces ensures that the reflector can be brought to and held in a desired position so as to reflect IR-radiation in the manner desired. Furthermore, this abutment of the reflector with said surfaces will result in the formation of two longitudinally extend
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Evans Geoffrey S.
Infrarodteknik AB
Leung Philip H.
LandOfFree
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