| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that, for the rotating power of a conventional rotation type ventilator, the wind pressure of outside air blown in from an upwind opening corresponding to 1/4 of the overall outer periphery of an outer periphery multiblade fan or a fan similar to the multiblade fan is mainly used, and thus, since wind and rain blown in from the upwind opening is discharged by the other 3/4 portion of the fan, this may lower atmospheric pressure in a building depending on the structure and use state of the building and cause wind and rain to flow back to the inside of the building in the case of rain. <P>SOLUTION: Two types of large and small multiblade fans each having one central shaft therein are built in the rotation type ventilator. The multiblade fans are arranged leaving a small interval so as to be rotated freely, and shapes of rotating blades and the orientation of a vortex forming the blades are set to be reverse to each other. Thus, while the multiblade fans are rotated reversely to each other, air in building is merged and discharged to the same direction. As a result, a backflow of wind and rain to the inside of the building can be completely prevented and an air discharge capacity can be drastically increased. <P>COPYRIGHT: (C)2011,JPO&INPIT |
