Fujikoki Corporation

Mitsumi Electric Company Ltd.

Katsushi Sato

Yoshiki Watanabe

Takeshi Shinoda

Yuya Kato

Shinichi Nemoto

Kenji Yamabiraki

Masato Sugino

To provide a drainage pump capable of reducing the amount of drain water remaining in a drain pan. A drainage pump includes a housing, an impeller housed in the housing, and a motor with a drive shaft connected to the impeller. The housing includes a suction pipe in a cylindrical shape extending in an up-and-down direction. A suction port facing downward and a concave surface in an annular shape around the suction port are disposed at a lower end of the suction pipe.

Drainage pump

A drain pump that maintains pump performance and reduces noise and vibration accompanying water scooping of a rotary impeller includes a large-diameter blade divided into an inner blade and an outer blade. A radius of an impeller scooping up water is the sum of the lengths of the inner and outer blades in a radial direction. The large-diameter blade is divided at a position where the amount of generated air bubbles is large, and the inner and outer blades are alternately disposed. Accordingly, air bubbles are escaped to a downstream side in a rotational direction, so that the intensity of the collision between the blades and air bubbles is decreased reducing noise caused by the burst of air bubbles and vibration caused by a collision load of the flow of a gas-liquid mixture.

Drain pump

A motor includes a case which has a containing portion in which a rotor is contained, a bracket which closes an opening of the containing portion, the bracket having a through hole, and a conductive elastic member which is provided in the through hole. The conductive elastic member urges a conductive wire against an inner face of the through hole so as to fix the conductive wire.

Motor

Growing community of inventors

Tokyo, Japan

Katsushi Sato