| 摘要 |
PURPOSE: A gas mixing structure is provided to restrict a disturbance in suction pressure of primary air by a method, wherein there is provided a controller for controlling a flow of the primary air for each of throats in such a way that a suction pressure approaches a uniform pressure when a manifold is installed. CONSTITUTION: Under a state in which a manifold is installed, a flow of primary air from a suction port is guided to each of throats(23) by the first to third walls(43-45), thereby suction pressure is increased more than that of before installation operation. In addition, since the first wall and the second wall(44) are higher than the third wall(45), a guiding amount of primary air caused by the first wall and the second wall(44) is increased more than a guiding amount of primary air caused by the third wall(45). Accordingly, the guiding amount for each of the throats(23) where the lowest suction pressure occurs before installing operation is increased, and the suction pressure at each of these throats(23) is increased more than that before the installing operation. Thus, under the installed state of the manifold, the suction pressure at each of the throats(23) may approach the uniform pressure.
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