Patent ID: 6907846
Filing Date: 2005-06-21
Classification: F24H,F28F,Y02B

Abstract:
1. A condensing gas boiler having a corrosion prevention structure of preventing corrosion caused by using heterogeneous metal, the condensing gas boiler comprising: a casing provided with a combustion chamber therein; a present heat exchanger arranged in the casing, which includes a first tubular tube made of a copper material having a plurality first thermal pins formed by processing an outer circumferential surface; a latent heat exchanger disposed at a distance from the present heat exchanger, which includes a second tubular tube whose inner portion is made of a copper material and whose outer portion is made of aluminum, having a plurality second thermal pins formed by processing an outer circumferential surface; end plates contacting and engaged with each other while the present heat exchanger and the latent heat exchanger are fixedly arranged in respective rows and installed in the casing; and a plurality of connection tubes which are mutually connected through a connection portion so that water can circulate through the present heat exchanger and the latent heat exchanger, wherein connection tubes which are made of a corrosion-resistant material are installed to have a broader area, and simultaneously connection tubes which are made of a corrosion-easy material are installed to have a smaller area, to thereby suppress galvanic corrosion through an unfavorable area ratio, and wherein an insulator for electrical insulation is provided between the end plates.