| 摘要 |
1,133,257. Fire tube steam or hot water boilers. GENERALE THERMIQUE. 2 June, 1966 [4 June, 1965], No. 24617/66. Heading F4A. A triple pass return tube steam or hot water boiler 1, is provided with cross water tubes 13 at a downstream end of its flame tube 2 to improve the water circulation between the upper and lower parts of the water chamber. In a hot water boiler the cross-tubes are in the form of rings (Fig. 2, not shown), and in the steam boiler, in the form of elbows (Fig. 4, not shown).
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