| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent generation of surging noise due to reverse flow of blast while cooling a heat radiation plate. <P>SOLUTION: In a blower 1 forming an air duct 4 composed of a circumference part air duct 4a and a downstream air duct 4b, provided with a scroll casing 5 including a tongue part 7 projecting at a boundary position of the circumference part air duct 4a and the downstream air duct 4b, and having the heat radiation plate 6 arranged in the air duct 4, the heat radiation plate 6 is arranged along a tangential line L1 direction of a centrifugal fan 3 and has one end a1 thereof positioned in an upstream side of a diameter line L2 in a blast direction A, and has an extended line L4 of the plate 6 crossing (b) with a line L3 connecting the tongue part 7 and an outer circumference of a centrifugal fan 3 on a blow off port side of a scroll casing 5, and is arranged in a position where shortest distance S1 from an outer circumference of a centrifugal fan 3, shortest distance S2 from an inner wall surface of the scroll casing 5 and shortest distance S3 from an outer wall surface of the scroll casing 5 are each longer than the distance S between the centrifugal fan 3 and the tongue part 7. <P>COPYRIGHT: (C)2007,JPO&INPIT |
