To prevent the occurrence of flow separation and an eddy current in a connected portion where a column pipe of a pump device and a discharge pipe are orthogonal to each other.
A pull-out type device (100) includes: a column pipe (102); an in-water motor pump (104) disposed in the column pipe (102); a discharge pipe (122) that is perpendicularly connected to the column pipe at the downstream side of flow (124) between the column pipe and the in-water motor pump; and a separation preventing structure (150) that provides a continuous surface where an inner circumferential surface of the discharge pipe is extended at the corner of orthogonally-connected portion of the column pipe to the discharge pipe, and that suppresses the flow from separating from the inner circumferential wall of the discharge pipe.
KATO KEIJI
SUGAYA TAKASHI
HONDA SHUICHIRO
| JPS6032599U | 1985-03-05 | |||
| JPS5740109A | 1982-03-05 | |||
| JPS58138293A | 1983-08-17 |
| US2590797A | 1952-03-25 |
Toru Miyamae
Yamazaki Kosaku
Yukio Kanegae
Koichi Kushida
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