Improvements in continuous step water heaters with axily parallel heat exchanger pipes (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in continuous-flow water heaters with axially parallel heat exchanger tubes, characterized in that for driving a drilling tool, the straight inner flanks per se are inclined by the narrow sides of the tubular channel in the area of the place of deflection, forming a constriction, in such a way, that during the lateral advance of the tool towards the inclined surfaces this cut the central line between the tubes at least in a third part of the length of the place of deviation, and because at penetrate into the place of deviation exceeding the ends of the tubes said tool presents between them the same lateral inclinations as the inner side flanks, and because the spacing between axes of the tubes of a pair of these corresponds to a maximum of three times the inner radius of the tube. (Machine-translation by Google Translate, not legally binding)