| 摘要 |
PURPOSE:To suppress the power of the shaft of a blower at low value, and to eliminate the need for installation of a muffler by arranging an air preheater at the suction side of air for combustion of the blower and elevating the temperature of air for combustion flowing into the blower. CONSTITUTION:Air A for combustion flows into the steam type air preheater 6 by the sucking force of the blower 7. The steam type air preheater 6 also functions as the adjustment of the flow of air A for combustion violently flowing toward the blower 7 by the action of a heat transfer pipe, etc. incorporated. Accordingly, strong suck-in sounds are reduced by mounting the air preheater 6, and the muffler need not be installed particularly. Since air A for combustion, temperature thereof is elevated by the steam type air preheater 6, flows into the blower 7, the density of air for combustion lowers, and the power of the shaft of the blower 7 is suppressed at low value. |
