| 摘要 |
PURPOSE:To prevent reverse flow of the open air to an internal air intake port, by a method wherein, in a running ram pressure utilizing open air intake system title device, an internal and open air switching damper controls an open air amount through regulation of the opening of an open air regulating damper during shut off of internal air. CONSTITUTION:When an open air regulating damper 8 is in a full opening position, the opening of an internal and open air switching damper 7, internal and open air are switched or mixed together to feed blast in a car room. Namely, when the internal and open air switching damper 7 is brought into an open air intake position, only the open air is taken in through an open air intake port 5. In this case, through regulation of the opening of the open air regulating damper 8, an intake open air amount is regulated. The regulation enables limitation of intake open air, and enables prevention of the reverse flow of it from an internal air intake port 4 to a car room. This constitution enables introduction of only the open air, and permits prevention of the reverse flow of the open air through the internal air intake port. |
