Ebara Corporation

Tetsutaro Fujiwara

Shoji Ito

Kikuichi Mori

Kenichi Kajiwara

Sou Kuroiwa

Seiichi Toguchi

Aki Ishikawa

Seiichiro Yamada

A multistage pump according to the present invention has a plurality of intermediate casings () formed by press-forming a steel plate. The intermediate casing has a cylindrical side portion (), a stage flat portion () with which an axial end face of an adjacent intermediate casing is held in contact, a stage side portion () extending axially from the stage flat portion, and a bottom portion () extending radially inward from the stage side portion. A relief plate () having an outer circumferential end face which is held in contact with an inner surface of a cylindrical side portion of the adjacent intermediate casing is attached to the bottom portion of the intermediate casing. The relief plate, the stage side portion, the stage flat portion, and the inner surface of the cylindrical side portion of the adjacent intermediate casing form a space in which an O-ring () is fitted.

Multistage pump

A submerged pump used, for example, in a duplex treating tank for sewage includes a pump casing including an inlet portion, a pump chamber and a discharge portion, and a motor for driving and rotating an impeller provided in the pump chamber. The motor is integrally secured to the pump casing. The pump casing has at least two subcasings assembled together, at least one of the subcasings having a projection defining a narrowed passage portion. An obtusely oriented air vent hole is provided in the lower casing.

Submerged Pump

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Tokyo, Japan

Tetsutaro Fujiwara