Mitsubishi Electric Corporation

Keisuke Oishi

Seiji Nakashima

Kosuke Sato

Koichi Obara

Yoshiki Sato

Tomonobu Izaki

An impeller includes a shroud on a first side with respect to a base, and blades. The shroud has protruding accommodations that open to a second side opposite to the first side, and has protrusions protruding to the first side from a blade main body of the blades accommodated therein. Each protruding accommodation has a first accommodation, and a second accommodation connected to an end in the extension direction thereof. The protrusion has a first projection and a second projection accommodated within the first and second accommodations respectively, and the first projection is fixed to the shroud while contacting and being fixed to a surface located on a side out of an inner surface thereof. The second projection is connected to an end in the extension direction of the first projection, and faces a surface on a side of an inner surface of the second accommodation via a gap.

Impeller, centrifugal blower, and indoor unit

A turbofan includes a boss rotatable about an axis, a main plate connected to the boss, a shroud having an intake hole, and a plurality of blades arranged between the main plate and the shroud. An undulating protrusion portion is arranged at a front edge portion of each blade. The undulating protrusion portion includes a plurality of protrusions. The pitches of the plurality of protrusions are formed so as to become smaller as approaching to the main plate side.

Growing community of inventors

Tokyo, Japan

Keisuke Oishi