Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Masahiro Arinaga

Shoji Yamada

Kunihiko Kaga

Hiroshi Yoshikawa

Hitoshi Kikuchi

Yasuaki Kato

Katsuhisa Ootsuta

Yasuyoshi Makino

Yoshimi Iwamura

A blower that can reduce noise and enhance efficiency by improving a blade structure of the blower used for, for example, an outdoor equipment of an air conditioner. An impeller includes plural blades attached to a peripheral surface of a boss at intervals in a peripheral direction, and a trailing edge of the blade has a protrusion-shaped part in which its central part in a radial direction is curved to expand to a suction side. With such a structure, a discharge velocity of air can be made uniform along the radial direction of the blade, and it becomes possible to reduce noise and to enhance efficiency.

Blower including blades attached to a boss

A blower includes: an impeller on which there are arranged axial flow bladesmounted at circumferential intervals to an outer peripheral surface of a boss; a case surrounding the impeller; and a bell mouth cylindrically constricted to guide gas into the case, wherein an inner diameter of the bell mouth is smaller than an outer diameter of the impeller. Further, each blade has, in the radial direction, a sweepforward wing portion situated on the boss side and exhibiting a positive advance ratio value, and a sweepback wing portion situated on the outer peripheral side of the blade and exhibiting a negative advance ratio value, with the arc length of each blade increasing from the boss side toward the outer peripheral side. Therefore, it is possible to achieve an improvement in ventilation efficiently, through an increase in static pressure and to achieve a reduction in noise.

Blower

Growing community of inventors

Tokyo, Japan

Masahiro Arinaga