| 摘要 |
In a circulation pump for taking in hot water from an intake portion (34) of a pump casing (33) and discharging the hot water from a discharge portion (35) by rotating a rotating shaft (37) to rotate an impeller (40) disposed in the pump casing (33) and for circulating cooling water in a motor casing (10) while cooling the cooling water with a circulating cooling mechanism (43), a hot water inflow preventing means (an external cooling water supply mechanism (48) or a pump (57)) for preventing the hot water in the pump casing (33) from flowing into the motor casing (10) by generating a stream of water in the motor casing (10) at least during warm standby in which the rotating shaft (37) is stopped is provided. |
