JPS55143349A - Heat exchanger - Google Patents

Abstract

PURPOSE: To improve heat exchanging efficiency by a mechanism wherein endothermic fins consisting of a plurality of tongue pieces with specified shape are fitted on the outer circumference of a heat exchanging cylinder body bing arranged to a flow path of a heating fluid in the heat exchanger for a hot-water storage type gas water heater.

CONSTITUTION: Endothermic fins 53 are formed in such a manner that tongue pieces c, d are made up among long cut lines a and adjacent long cut lines a by forming short cut lines b, which divide portions among the said long cut lines a into two equal portions, at regular intervals toward the center from the fringe in an outer fringe portion of a disc, and tongue pieces 532, 533 are built up by alternately tilting and raising and letting fall the tongue pieces c, d up and down. A large number of the endothermic fins 53 are fitted on the outer circumference of an outer cylinder 51 of a heat exchanger 50 in laminating shapes. According to this construction, combustion gas with a high temperature flows in a spiral passage P which the fins 53 form in a spiral current. Thus, high heat exchanging efficiency is obtained because the gas with the high temperature positively contacts with the outer cylinder 51 and the endothermic fins 53.

COPYRIGHT: (C)1980,JPO&Japio