| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bidirectional axial fan and a tunnel ventilation system which are simple, excellent in aerodynamic characteristics, low at running cost, and excellent in maintainability and safety. <P>SOLUTION: The bidirectional axial fan is provided with an impeller 3 with a plurality of rotor blades 1 attached to a hub, a casing 6 installed in the circumference of the impeller 3 and a rotation drive device 4 to rotate the impeller 3. The rotor blades 1 forms a shaft unsymmetrical blade profile which is unsymmetrical with respect to a center shaft of a blade section at the blade section vertical to the blade center shaft expanding from the rotation center to the radial direction. The rotation drive device 4 is a rotation drive device which performs one-way rotation, and comprised of a phase reversing drive mechanism 11 which reverses the impeller 3 and the one-way drive device so as to rotate the rotation shaft 9 for 180 degrees. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
