Electric resistance heating devices – Heating devices – Vaporizer
Patent
1997-11-06
1999-11-23
Walberg, Teresa
Electric resistance heating devices
Heating devices
Vaporizer
261 99, F24F 608, B01D 4716
Patent
active
059915072
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention refers to a vaporizer for vaporizing highly volatile liquids, especially liquid insecticides, comprising a receptacle for said liquid, a wick absorbing said liquid, and a heating element associated with said wick.
2. Description of the Related Art
A vaporizer of this type is known from DE 37 37 272 C2. In the case of this known vaporizer, a receptacle is arranged in a housing, said receptacle being introduced in the housing from below and being adapted to be secured therein e.g. by means of screws. The receptacle is filled with a highly volatile liquid, especially a liquid insecticide. For vaporizing the liquid by heating, a wick is inserted in said receptacle through an upper opening, an upper end of said wick projecting beyond the receptacle, whereas the lower end thereof is immersed in the liquid. A heating element is arranged the upper end of the wick the heating element surrounds said wick and which heats an upper portion thereof so as to vaporize the liquid sucked up from the receptacle.
This known vaporizer is disadavantageous insofar as it is comparatively difficult to refill the receptacle because said receptacle must be removed from the housing together with the wick. Furthermore, the wick must be removed from the upper end of the receptacle so that additional liquid can be poured into the receptacle. For this purpose, the wick can, for example, be secured in position in a separate holder attachement, which is adapted to be screwed onto the upper end of the receptacle. Analogously, a renewed insertion of the wick and of the receptacle into the housing, when the receptacle has been refilled, is comparatively complicated.
Furthermore, it is also disadvantageous that the lower end of the wick has to be positioned accurately so as to suck up the liquid in the receptacle completely. When the lower end of the wick is positioned at a distance from the receptacle base, a liquid residue that cannot be used will remain in the receptacle.
OBJECTS AND SUMMARY OF THE INVENTION
Hence, it is the object of the present invention to improve a vaporizer of the type mentioned at the beginning in such a way that it can be handled more easily and that it can simultaneously be guaranteed that the liquid contained in the receptacle can be vaporized completely.
This object is achieved in that the wick is arranged in spaced relationship with said receptacle and is connected thereto via a supply line used for supplying the liquid.
In this way, the receptacle can be handled and filled independently of the wick. The receptacle can be filled without being removed from a respective housing, since, in contrast to e.g. DE 37 37 272 C2, no wick projects beyond the upper end of the receptacle. In addition, it is no longer necessary to position the wick in the receptacle in such a way that the liquid can be sucked up completely. The wick is now supplied with said liquid via the supply line until the receptacle is completely empty. A further advantage is that the vaporizer according to the present invention is ready for use within a shorter period of time because the liquid need not be transported along the whole wick towards the heating element by means of the capillary action or the like. The liquid flows via the supply line within a comparatively short period of time directly to the wick, which has, in comparison with DE 37 37 272 C2, comparatively small dimensions.
In order to guarantee that the receptacle empties completely in the most simple manner, the wick is arranged below the receptacle. In this way, the liquid can flow automatically to the wick without further aids, such as pumps or the like being required.
The wick can be produced from various materials in a manner known per se. Such materials are, for example, various fibers, such as felt, cotton or the like. The wick is preferably made from an inorganic, porous material. Such materials are ceramics, glass fibres, plaster, bentonite, kaoline, talcum, diatomaceous earth, perlite, etc. The wic
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patent: 4467177 (1984-08-01), Zobele
patent: 4748314 (1988-05-01), Desage
patent: 5602958 (1997-02-01), Vergnes
Paik Sam
Perycut-Chemie AG
Walberg Teresa
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