| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pump device capable of suppressing an impact force acting on an impeller even when a water-hammer action is generated by opening/closing of a valve.SOLUTION: A pump device includes: a rotary shaft 42 which is inserted into a first intermediate casing 70 and a second intermediate casing 80 laminated and arranged in an axial direction; a first impeller 71 which is accommodated in the first intermediate casing 70 and mounted on the rotary shaft 42 via a sleeve 48; and a second impeller 81 which is accommodated in the second intermediate casing 80 and mounted on the rotary shaft 42 via a submerged bearing 43. The submerged bearing 43 includes: an annular rotary part 44 mounted on an outer peripheral surface of the rotary shaft 42; an annular fixing part 45 provided being separated in a radial direction of the rotary shaft 42 with respect to the rotary part 44, and mounted on the second intermediate casing 80; and a plurality of protrusions 46 protruding from the fixing part 45 to the rotary part 44 side, formed being in contact with the outer peripheral surface of the rotary part 44 and arranged in the circumferential direction at intervals.</p> |
