| 摘要 |
PROBLEM TO BE SOLVED: To provide an exhaust collection cylinder capable of obtaining an excellent noise reducing effect, a vibration combustion preventive effect, and waterproof performance, without causing a problem that the whole of the cylinder is enlarged in size.SOLUTION: First and second exhaust gas channels R1 and R2 are provided as exhaust gas channels for leading combustion exhaust gas passing through a heat exchanger 12 to an exhaust port 20. The first gas channel R1 is a channel which infiltrates the combustion exhaust gas to a rear side of a draining board 3, and then advances an upper side of the draining board 3 toward the exhaust port 20. The second exhaust gas channel R2 is a channel which makes a part of the combustion exhaust gas flow into a space portion 5 formed between the draining board 3 and a horizontal board portion 40 of a lower board 4, and then advances the part of the combustion exhaust gas toward the exhaust port 20. A ventilation hole 42 for making the combustion exhaust gas flow into the space portion 5 is provided on an uprising board portion 41 of the lower board 4, and opened in a generally horizontal direction. |
