| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a submerged bearing lubrication system capable of wetting a submerged bearing 34 by lubrication liquid and adjusting a pressure of lubrication liquid to be slightly higher than a pressure on the outside of a bearing case. SOLUTION: A shaft seal member is provided on both end sides in the axial direction of the bearing case to form a lubrication liquid chamber, the submerged bearing 34 is provided therein and is wetted by lubrication liquid, lubrication liquid discharged by a lubrication liquid pump 64 in an inflow pipe 60 is made to flow into the lubrication liquid chamber and is made to flow out in an outflow pipe 62, a lubrication liquid pressure sensor 68 and a flow adjusting valve 72 are provided in this outflow pipe 62, and a pressure sensor 76 is provided in a discharge elbow of a main pump 30. A pressure on the outside of the bearing case is computed based on a value detected by the pressure sensor 76, its position, and a difference in height of the submerged bearing 34 by pumping operation, the flow adjusting valve 72 is adjusted so that a pressure in the lubrication liquid chamber is slightly higher than the computed pressure, and the flow adjusting valve 72 is adjusted so that a pressure in the lubrication liquid chamber is slightly higher than atmospheric pressure by aerial operation in which discharged pressure is not detected by the pressure sensor 76.</p> |
