초록 ▼

A centrifugal blower comprising a siroco fan having a plurality of blowing fans, and a scroll casing forming a spiral draft passage at an external side of the siroco fan, where a siroco fan is so mounted that spiral centers (0.sub.2,0.sub.3) comprising the draft passage of the scroll casing are deta

A centrifugal blower comprising a siroco fan having a plurality of blowing fans, and a scroll casing forming a spiral draft passage at an external side of the siroco fan, where a siroco fan is so mounted that spiral centers (0.sub.2,0.sub.3) comprising the draft passage of the scroll casing are detached from a center (0.sub.1) of the siroco fan at a predetermined distance, such that a spiral curve of the scroll casing is simply changed to a non-linear curve to thereby enable to increase a flow rate even at a low revolution of the siroco fan and to reduce noise.

대표청구항 ▼

[ What is claimed is:] [1.]1. A blower, comprising:a fan having a plurality of blades and a fan center; anda casing having a spiral forming a spiral passage around said fan, said spiral having a spiral center spaced-apart from said fan center by a predetermined distance, wherein said spiral of said

[ What is claimed is:] [1.]1. A blower, comprising:a fan having a plurality of blades and a fan center; anda casing having a spiral forming a spiral passage around said fan, said spiral having a spiral center spaced-apart from said fan center by a predetermined distance, wherein said spiral of said casing is an Archimedean spiral or an logarithmic spiral. [9.]9. A blower, comprising:a fan having a plurality of blades and a fan center; anda casing having a spiral forming a spiral passage around said fan, said spiral having a spiral center spaced-apart from said fan center by a predetermined distance, wherein a scroll start point and a scroll end point of said spiral are on the same line such that a scroll angle varies from zero (0) degree to 360 degrees.10. The blower of claim 9, wherein said predetermined distance (D) between said fan center of said fan and said spiral center of said spiral is to satisfy a formula, 0