Evaporation device for volatile substances

#The present invention relates to a device to evaporate volatile substances, in particular insecticides and/or aromatics.

#Devices of this type for evaporation of volatile substances are generally known. For example, evaporation devices are known where a small plate is introduced into an evaporation device, impregnated with an active ingredient, and heated in order to evaporate the active ingredient. Another known method utilizes a container for retaining a volatile substance within the housing of an evaporation device. The container utilizes a wick that, via capillary action, conveys the substance to be evaporated out of the container. The container is located next to a heating element such as a ceramic block, and the wick end protrudes from the container so that the substance is evaporated via radiant heat emitted by the heating element. The evaporate then escapes from the housing into the surrounding environment via aeration slits in the housing.

#European patent 0 943 344 A1 discloses such as device for the evaporation of volatile substances, in particular of insecticides and/or aromatics. The disclosed device utilizes a housing with a heating apparatus that incorporates a ceramic heating block as its heating element. The disclosed device further utilizes a container for retaining a substance to be evaporated. The container can be connected to the housing, and a wick can be inserted into the container. The operative function of the disclosed device requires the wick end to protrude from the container and into a wick recess within the heating block to effect the evaporation of the substance within the container.

#The construction designed to carry out the present invention will hereinafter be described, together with the features thereof.

#The invention will be more readily understood from a reading of the following specification and by reference to the accompanying drawings forming a part thereof, wherein an example of the present invention is shown and wherein:

#FIG. 1 is a schematic enlarged top view of a heating device with a heating block with two wick openings and one central heating element ATI=according to the invention;

#Referring to the drawings, the invention will now be described in more detail. In the drawings, like numbers represent like elements throughout the several views. A preferred embodiment of the present innovation is depicted in FIG. 1 through FIG. 14.

#FIGS. 1, 2 and 3 illustrate different views of an evaporation device 2 for the evaporation of volatile substances, in particular of insecticides and/or aromatics ATI which includes a heating device 1. FIG. 3 shows the heating device having a heating block 1, which is preferably made of ceramic, having a generally oval form. An electric resistance element 3, serving as the heating element, is located approximately in the central area of the heating block 1 as seen from above. Two wick openings 4, 5 form passage openings in the heating block 1. The wick openings are identical and equidistant from the resistance element 3. This provides a symmetric placement of the wick openings 4, 5 about the resistance element 3. FIG. 8 is a section through the heating block 1 along line A—A.

#FIG. 7 illustrates resistance element 3 schematically without heating block 1. A rod-shaped resistance body 6 is preferably made of ceramic with a certain content of A1203, and is coated with a resistance layer 7 of metal oxide, e.g. a nickel-chrome alloy layer. To set a given resistance value, this resistance layer 7 is cut in a helical form into resistance layer 7, preferably by means of laser spiral cutting, so that a helicoidal cut is formed around cylindrical resistance body 6. A metal cap 8, 9 is preferably pressed on either end of the coated, rod-shaped body 6 for an electrical connection to resistance layer 7. An electric line 10, 11, preferably insulated copper wire, is welded to each cap 8, 9.