| 摘要 |
PURPOSE:To enable to realize forced circulation without using a pump by a method wherein a conical spiral water tube is horiztonally arranged so as to face the large coil diametral part with larger pipe diameter against a burner and to raise up the small coil diametral part with smaller pipe diameter on the way. CONSTITUTION:A water chamber is formed between an outer tube 1 and an inner tube 2, at the lower end of which a combustion chamber 4 is formed. The conical spiral water tube 8, the pipe diameter at the large coil diametral part of having a larger diameter than that at its small coil diametral part, is horizontally arranged. A draw-in water tube 9 is connected to the large coil diametarl part and a draw-off hot water tube 10 is connected to the small coil diametral part, which is located high above the large coil diametral part by raising-up the water tube 8 on the ay. The draw-in water tube 9 is open near the upper end of the inner tube 2 in the water chamber and the draw-off hot water tube 10 is also open in the water chamber at the level lower than the outlet of the draw-in water tube 9. The large coil diametral part is arranged so as to face against the burner 7. The numerals 11 and 12 show vertical and horizontal U-tubes. |
