| 摘要 |
PURPOSE:To prevent the flow rate of discharge oil through a oil-feeding pump from branching into a bypass pipe by increasing pressure head at the oil-feeding pump inlet side of the bypass pipe more than that at the oil-feeding pump outlet side at oil-feeding rate. CONSTITUTION:A bypass pipe 6 is connected to the pipe passage 11 at an inlet side and an outlet side 12 of oil-feeding pump 3. And an opening section 7 at the upper stream side of the pipe 6 is fitted into the pipe passage 11 by providing a gap between the bypass pipe 6 and the inner wall of the pipe passage 11 and the opening 7 is arranged facing to the flow of insulating oil. With the oil-feeding pump 3 operated at an oul-feeding rating, the velocity head at a common oil-guide pipe 2 is converted to the pressure head at the inlet side of the pipe 6. On the other hand, there is no variation in the oil flow speed at the outlet 8 of the bypass pipe. Therefore, the pressure head at the opening 7 is always high as compared to that at the outlet 8 of the bypass pipe. In this way, the branching of the flow of oil by the pipe 6 can be prevented. Furthermore, insulating oil flows smoothly by the pipe 6 at self-cooling rate, and no pressure loss will be resulted. Therefore, a decrease in the flow rate of circulating oil can be prevented. |
