| 摘要 |
PURPOSE:To enlarge flow resistance of an exhaust passage part and improve efficiency of exhaust by providing a control part which controls an exhaust flow in a short, even if small, exhaust passage by means of a table plate outer and a table plate inner. CONSTITUTION:An exhaust flow control part 29a is formed through expanding a formative part of a short exhaust passage 28a for a table plate outer 25 into a passage 28a, and likewise, a control part 29b is formed through expanding a part of the table plate outer 25 which forms a long exhaust passage 28b into the passage 28b, then a table plate inner 27 is welded to said control parts 29a, 29b. The control part 29a is bigger in cubature than the control part 29b, and this balances with the long passage 28b with big flow resistance and the short passage 28a with small flow resistance, well balanced discharge of the exhaust from the rear end opening part of an exhaust passage 28 being performed. |
