| 摘要 |
PROBLEM TO BE SOLVED: To improve balancing of a centrifugal fan by preventing blades from being warped, and reducing deformation of a main plate and a shroud.SOLUTION: A first blade section 18 comprises a main plate 21 and a plurality of blades 22 extending from the main plate 21, and a distal end of each of the blades 22 includes a first flat end portion 27 and a connecting end portion 29. A second blade section 19 comprises an annular shroud 23 and a blade fixing part 24 for fixing the blades 22 protruding from an inner surface of the shroud 23. The blade fixing part 24 includes: a first horizontal flat face 33, which can be brought into contact with the first flat end portion 27, provided between a first supporting portion 35 and a second supporting portion 36 and a connecting face extending from an inner end of the first horizontal flat face 33 to the shroud. A space 37 is provided between the connecting end portion of the first blade section 18 and the connecting face of the second blade section 19, and the first flat end portion 27 includes a welding protrusion 27a which protrudes from the first flat end portion 27. |
