Electric heating – Heating devices – Resistive element: igniter type
Patent
1986-09-22
1988-09-06
Goldberg, E. A.
Electric heating
Heating devices
Resistive element: igniter type
219275, 118726, F22B 128
Patent
active
047695285
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to devices for the evaporation of active ingredients incorporated in a carrier.
2. Description of the Prior Art
In the known apparatus German Auslegeschrift No. 2,730,855, the active ingredient carrier in the form of a plate and for the purpose of evaporation of the active ingredients it is placed with its whole surface against the electric heating means which are situated behind a window in the housing and are heated to the operating temperature.
Intense evaporation of active ingredients can be achieved by this arrangement but the more intense the rate of evaporation the sooner will the reserve of active ingredients in the active ingredient plate be exhausted, with the result that the plate must be replaced after a relatively short time if a constant rate of evaporation of active ingredient over a considerable period is required.
SUMMARY OF THE INVENTION
It is an object of the present invention to improve an apparatus of the type indicated so that correctly dosed evaporation of active ingredients as required for the given circumstances can be achieved by simple means and over a much longer period of time than with known apparatus without the need to replace the active ingredient carrier.
The solution to this problem is characterised in that the active ingredient carrier is in the form of a column and optionally is inserted replaceably, with its longitudinal dimension vertically, in a sleeve which is adapted to the active ingredient carrier in its form and dimensions and is open at the top and bottom, and in that optionally the sleeve is arranged inside the housing so as to be spaced apart from the housing wall on all sides, which housing has exhaust gas openings only at the top.
Due to these measures, the surface area of active ingredient carrier facing the electric heating means and therefore exposed to the heating for evaporation of the active ingredients is relatively small compared with the volume of active ingredient carrier.
This not only ensures a well controlled rate of evaporation of active ingredients but also enables the capacity of the active ingredient carrier to be increased without any increase in the surface area of active ingredient carrier exposed to the action of the heating means.
Furthermore, the stream of air which flows upwards through the exhaust gas duct bounded by the sleeve and the wall of the housing and which has also been heated by the heating means absorbs the evaporated active ingredients by suction and carries them along at relatively high speed so that the evaporated active ingredients are uniformly distributed in the surrounding atmosphere at an hitherto unobtainable speed.
It is advantageous if the sleeve and the active ingredient carrier are situated at a vertical distance from the heating means, inter alia in order that less heat resistant and therefore less expensive materials may be used for the sleeve.
One advantageous further development of the apparatus described above consists in that the distance of the sleeve with active ingredient carrier from the heating means is adjustable.
This enables the intensity of evaporation to be altered by altering the distance of the sleeve with active ingredient carrier from the heating means, for example so that a constant rate of evaporation of active ingredient can be maintained over a prolonged period of operation.
Furthermore, for increasing the exchange of heat by convection, it is advantageous to arrange the sleeve with active ingredient carrier centrally above the heating means and to ensure that the radiant area of the heating means is greater than the area of the end face of active ingredient carrier exposed to the heating means.
One variation for selectively altering the degree of evaporation of active ingredient is characterised by electric heating means having an adjustable operating temperature.
An embodiment of the invention is described below by way of example with reference to the drawings, in which
BRIEF DESCRIPTION OF THE FIGURES
REFERENCES:
patent: 4482799 (1984-11-01), Pricenski et al.
patent: 4543467 (1985-09-01), Eisele et al.
Hautmann Horst
von Philipp Fritz
Globol-Werk GmbH
Goldberg E. A.
Lateef M. M.
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