| 摘要 |
PROBLEM TO BE SOLVED: To improve performance of a blower by reducing collision loss in a centrifugal blower including a backward impeller. SOLUTION: In the backward impeller for the centrifugal blower provided with a casing and a multiple blade impeller rotatably supported in the casing, a plurality of blades having chord length from an outer circumference edge to a middle of an inner circumference edge of the impeller are provided along a circumference of the impeller with even intervals, and roughly triangular extension parts making a leading edge part bent forward in a rotary direction in a stream line shape and making the leading edge reach an inner edge part of the impeller are provided at the leading edge part of each plurality of blades. The multiple blade impeller is formed by bending end part of the blade in an impeller outer circumference edge side into a rotary direction of the impeller. COPYRIGHT: (C)2007,JPO&INPIT
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