COMPACT SPIRAL-THROUGHFLOW HEATING UNIT WHICH CAN OPERATE AT HIGH PRESSURES

摘要

The invention relates to a spiral-throughflow heating unit for electrical devices for preparing hot beverages, having a tubular carrier with at least one electrical heat conductor structure provided using the thick-film technique on the outer side of said tubular carrier and with in each case one encircling, outwardly pointing flange at the two ends of said tubular carrier, having a core element which is arranged in the tubular carrier and which has at least one web which runs around in a spiral shape on the lateral surface of the core, wherein two adjacent web flanks form a flow channel with the lateral surface, which flow channel is substantially sealingly closed off in the outward direction with respect to a flow duct by the inner side of the tubular carrier, having a first and a second end piece with in each case one port which communicates with the flow duct, wherein the end pieces are in each case fixedly connected at their end of the tubular carrier to the core element, and wherein the unit composed of the end pieces and the core element is composed of at least two parts which are in engagement with one another by means of at least one snap-action connection and which are mechanically clamped in such a way that seals which are arranged between the tubular carrier and the respective end pieces are loaded with a contact pressure which is sufficient to ensure that the seals are water-tight and vapour-tight.