| 摘要 |
PURPOSE:To secure sufficient lubrication even if there occur any faults in pipings of an oil supply device and in such an emergency as loss of alternate current source, by connecting an oil feed line for supplying lubricating oil to a bearing portion with an oil deliver line for delivering lubricating oil from an oil tank provided on a periphery of the bearing portion to a gas separating tank, and providing a bypass line including a lubricating oil pumping device. CONSTITUTION:There is provided a bypass line 25 on the way of an oil feed line 17 and an oil deliver line 6, which bypass line includes a direct current source driven pump 20, a relief valve 12b, a pressure gauge 14b, a pressure switch 15b, a filter 10b, electrically powered selector valves 21a and 21b on a suction side, and electrically powered selector valves 22a and 22b on a tank side. In the case that any faults occur in an oil supply device 16, electric signal is fed from a pressure switch 15a to the pressure switch 15b and simultaneously the electrically powered selector valves 22b and 22a are operated to open and close, thereby to feed oil in a gas separating tank 24 through the selector valve 22b, the filter 10b, and the selector valve 21a. Then, the oil pressure is controlled to a required value by the pump 20 and the relief valve 12b, and thereafter oil is fed through the oil feed line 17 to a thrust bearing surface. Thus, emergency state may be avoided. |
