To provide an inexpensive turbofan by constituting a configuration having no regulation in a shape of a blade of the turbofan to facilitate improvement of performance and constituting a simple mold structure while reducing its weight and improving productivity.
Since the blade 5 of the turbofan is made hollow and is attached to a main plate 4, a complicated mold is unnecessary, and design of free blade shape becomes possible to provide the turbofan having high performance. By molding the blade by blow molding or pouring high pressure gas, a wall face of the blade 5 is uniform and its thickness becomes small. By providing a first fitting part 9 in the blade 5 and a second fitting part 11 in a suction ring 10 and fitting them mutually, it can be assembled without fixing by ultrasonic welding and bonding to provide the simple turbofan.
COPYRIGHT: (C)2005,JPO&NCIPI
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