Patent Number: 6,332,755

Title: Blower and method for molding housing thereof

Abstract: The present invention provides a blower that improves the P-Q characteristic and reduces noise. The apparatus is a blower that sucks air inside through slits (6) provided in an annular wall (2), wherein the blade thickness near a blade end s is progressively reduced toward the front end, and the location F of the maximum thickness gradually moves back toward a blade trailing edge side u2 so as to make the blade advance angle near the front end larger than in other locations. In addition, the width of a slit is made wider in sections near a spacer than in other sections. Alternatively, notches are provided in the outer perimeter of annular plates near the spacers so as to reduce the radial length of the annular plates. This arrangement improves the P-Q characteristic and reduces noise.

Inventors: Fujinaka; Hiroyasu (Yonago, JP), Otsuka; Shigeru (Yonago, JP)

Assignee: Matsushita Electric Industrial Co., Ltd.

International Classification: F04D 29/66 (20060101); F04D 29/52 (20060101); F04D 29/40 (20060101); F04D 029/66 ()

Expiration Date: 12/25/2018