| 摘要 |
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.
|
