Mitsubishi Denki Kabushiki Kaisha

Katsumi Ohashi

Takashi Ikeda

Hiroshi Yoshikawa

Sou Suzuki

Makoto Yoshihashi

Satoshi Chiguchi

A cross flow having a volute is disclosed which is less noisy during its operation. A volute-portion starting radius which is the length of a segment O-F.sub.1 at a volute-portion starting point F.sub.1 is R.sub.1 ; a maximum volute radius which is the length of a segment O-F.sub.2 at the outlet portion starting point F.sub.2 is R.sub.M ; a maximum volute angle which is an angle formed by the segment O-F.sub.2 and O-F.sub.1 is .varies.M; a point on the volute portion having a distance to the center O of the rotating shaft is R.sub.J =(R.sub.1 +R.sub.M)/2; an angle .varies..sub.J is formed by a segment connecting that point and the center 0 of the rotating shaft; the segment O-F.sub.1 is .varies..sub.M /2 (=F.sub.1 -O-F.sub.J); a volute portion of a scroll casing is formed into a circular arc such that R.sub.1 &lt;R.sub.J &lt;R.sub.M, and the circular arc passes through the points F.sub.1, F.sub.J, and F.sub.2.

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Tokyo, Japan

Katsumi Ohashi