VERTICAL SHAFT PUMP

PROBLEM TO BE SOLVED: To provide a vertical shaft pump in which flowing-in of heat generated at a sliding portion between a bearing device and a rotary shaft toward the rotary shaft side can be suppressed.SOLUTION: The vertical shaft pump comprises a vertically extending and rotating rotary shaft; an impeller fixed to a lower end of the rotary shaft and rotated together with the rotary shaft; and a bearing device for supporting the rotary shaft. The bearing device uses pumped water as lubricating liquid during a water pumping operation and can be operated under no-lubrication sliding with no lubricating liquid during idling operation. An outer circumferential surface of the rotary shaft at a portion supported by the bearing device is provided with a shaft sleeve and an inner circumferential surface of the shaft sleeve is provided with a groove for suppressing transmission of a sliding friction heat generated at the bearing device to the rotary shaft.SELECTED DRAWING: Figure 2 【課題】軸受装置と回転軸との摺動部で発生する熱の回転軸側への流入を抑制することのできる立軸ポンプを得る。【解決手段】立軸ポンプは、鉛直方向に延び回転する回転軸と、この回転軸の下端部側に固定され前記回転軸と共に回転する羽根車と、前記回転軸を支持する軸受装置とを備える。前記軸受装置は、揚水運転時には揚水を潤滑液として使用し、空転運転時には潤滑液のない無潤滑摺動で運転可能なものであり、前記軸受装置で支持される部分の前記回転軸の外周面には軸スリーブを設け、該軸スリーブの内周面側には、前記軸受装置で発生する摺動摩擦熱が回転軸側に伝達されるのを抑制するための溝が設けられている。【選択図】図２