| 摘要 |
PROBLEM TO BE SOLVED: To provide a supporting metal fitting for a heat conductive pipe, where a fatigue crack or a creep crack is hard to occur even if thermal stress accompanying the repeat of start and stop of a boiler or thermal stress at stationary operation works, and a heat exchanger equipped with it, and a boiler. SOLUTION: This is a supporting metal fitting 2 which is attached to the external surface of the heat conductive pipes 1 being juxtaposed to constitute a heat exchanger, so as to prevent the mutual shifting and contact of the heat conductive pipes 1 and support one part of the load of the heat conductive pipes 1, and insertion metal 7 which has a linear expansion coefficient between those of the heat conductive pipe 1 and the supporting metal fitting 2 is put between the supporting metal fitting 2 and the heat conductive pipe 1, and the supporting metal 2 is connected to the heat conductive pipe 1. At this time, for at least one hand between the supporting metal 2 and the inserted metal 7, the tilt material where the linear expansion coefficient changes gently may be used, or as the inserted metal 7, the material lower in yield stress than the heat conductive pipe 1 and the supporting metal fitting 2 may be used. |
