| 摘要 |
PURPOSE:To suppress the disturbance of secondary air by providing a laminated smoothing plate comprising a porous plate and honey-comb grid at the upstream of a secondary air port with the honey-comb grid positioned at the downstream. CONSTITUTION:Since secondary air is compulsorily supplied from the end surface of a secondary air chamber 17, the flows of secondary air are irregular. However, in the upstream zone of a secondary air port 18, the flows of secondary air are all smoothed by the honey-comb grid 20 at the downstream side of the porous plate 19. Since the porous plate 19 at the downstream side is partitioned in small spaces by the honey-comb grid 20, a rapid expansion thereof is suppressed so that the disturbance at the edges of the porous plate 19 is reduced. Therefore, the secondary air having small disturbance at the edges of the porous plate 19 is reduced. Therefore, the secondary air having small disturbance is supplied to a secondary air port 18 and a flame is stabilized and a noise is reduced.
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