| 摘要 |
PROBLEM TO BE SOLVED: To prevent mixing of exhaust gas toward the supply side at the time of back wind. SOLUTION: In this supply and exhaust tube 1, a back wind protective plate 7 is provided in an exhaust port 4. Since exhaust port area S0 becomes smaller than exhaust passage area S1 in the exhaust tube 2, flow speed (injection speed) of exhaust gas becomes faster, and exhaust gas is emitted and diffused farther. Consequently, mixing of exhaust gas into a supply air port 5 can be prevented at the time of back wind, and combustion performance can be maintained favorable. Since the back wind protective plate 7 is provided at the exhaust port 2, direct blow of wind into the exhaust port 2 can be prevented. Exhaust can thus be smoothly discharged even at the time of strong wind, and favorable combustion performance can be maintained. COPYRIGHT: (C)2005,JPO&NCIPI
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