Electric resistance heating devices – Heating devices – Vaporizer
Patent
1991-12-06
1993-06-22
Walberg, Teresa J.
Electric resistance heating devices
Heating devices
Vaporizer
392392, 392405, F24F 610
Patent
active
052221865
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for vaporizing active substances, perfumes or similar volatile substances, consisting of a housing comprising an electrical heating means and a container for the liquid to be vaporized which is connectable to the housing and in which a wick or the like is mounted by means of which the liquid is supplied to the heating means, and the wick passes through the heating means at a through passage adapted to the wick, the heating means further consisting of a ceramic heating body with an electrical heating coil let into said body.
Such apparatuses are known in the art.
The known apparatuses are disadvantageous in many respects. In particular, the constructional form is very complicated because a great number of individual parts have to be assembled together and these parts are technically complicated to manufacture. A further disadvantage is that in the known apparatuses according to the preamble the heating body is formed as circular disc which has a centre hole serving to receive the wick end. The heating coil is inserted bent into the ceramic heating body, following the shape thereof, and this leads firstly to assembly difficulties and secondly makes a properly located supplying and arrangement of the heating coil in the heating body extremely difficult. Moreover, due to the necessarily provided bending of the heating coil the distance between the individual convolution flights of the heating coil on the inside is relatively very small but on the outside relatively large and this results in an ununiform heating load which is detrimental to the life of the heating coil. Furthermore, in the known apparatuses the wick configuration is disadvantageous because the proper supply of liquid from the container to the heating means is not always ensured, as practical experience has shown.
Proceeding from this prior art, the problem underlying the invention is to provide an apparatus of the type according to the preamble which with simple production has high functional reliability and a long life.
To solve this problem it is proposed that the heating body comprises a recess extending tangentially to its through passage which is made rectilinear and into which the heating coil is inserted and which is filled with potting composition, the electrical leads of the heating coil being led out of the heating body substantially coaxially to the heating coil.
This configuration achieves that the heating body itself is simpler to make than hitherto and in particular also a uniform heat load is obtained after the proper arrangement of the heating coil. The arrangement of the heating coil itself involves no problems at all because said coil can be inserted into the rectilinear recess and finally fixed there by potting or casting composition. It is of course also possible instead of the single arrangement of a heating coil to arrange two heating coils extending for example parallel to each other on either side of the through passage in the surface of the heating body, the latter then having to have two parallel recesses for this purpose. The ceramic composition of the heating body itself effects the heat conduction and thus a uniform distribution within the entire heating body of the heat produced by the heating coil so that the through passage is heated largely uniformly and thus a uniform emission of aromatic substance from the wick end disposed in the through passage can be achieved.
A preferred further development is seen in that the heating body is a substantially triangular flat disc, the through passage is formed extending transversely to the area extent of the disc near one tip thereof and near the edge opposite said tip the recess for the heating coil is arranged.
This configuration is firstly compact and secondly saves material and as a result a more economical configuration is obtained whilst retaining the advantage of assembly and efficiency.
A preferred further development is seen in that the heating coil has a length corresponding substantially to the diameter of the through passage
REFERENCES:
patent: 3431393 (1969-03-01), Katsuda
patent: 5038394 (1991-08-01), Hasegawa
Fischer Jurgen
Hautmann Horst
Schimanski Georg
Globol GmbH
Walberg Teresa J.
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