| 摘要 |
<P>PROBLEM TO BE SOLVED: To suitably prevent the production of drain in an exhaust passage even if an air supply passage and the exhaust passage are adjacent to each other. <P>SOLUTION: In a supply and exhaust tube 20, a communication hole 21 communicating with the air supply passage 18 is formed in the exhaust passage 5, and a venturi 22 for making the internal pressure of the exhaust passage 5 lower than the internal pressure of the air supply passage 18 and introducing a part of combustion air in the air supply passage 18 to the exhaust passage 5 through the communication hole 21 is provided at the upstream side of the flow of the combustion exhaust higher than the communication hole 21. <P>COPYRIGHT: (C)2013,JPO&INPIT |
