device for the evaporation of volatile substances, in particular insecticides and / or fragrances

摘要

The vaporizer comprises upper and lower body halves with a wick (6) connecting the substance to be vaporized to dispersal vents (9) in the upper half. The heater is a rod of ceramic coated with a conductive layer and connected at each end to an electrical plug (26). The conductive layer is cut away e.g. in a spiral to form a conductive path of desired length and resistance and thus operating temperature. Independent claims are also included for (a) The vaporizer where heater rod is encapsulated in a block of high thermal conductivity (b) The vaporizer with heater close to the wick end.