| 摘要 |
PURPOSE:To eliminate the immersion of liquid from a pump side to a motor side by driving sealing means between a motor and a pump when the internal pressure of the motor decreases to the specified value or lower. CONSTITUTION:The internal pressure of a motor 11 is measured by a detector 32, and inputted to an instruction unit 38 of control means 33. The unit 38 outputs a stop command 39 when discriminating that the motor pressure becomes the specified value of lower on the basis of a signal from the detector 32 and operates a pressurizing unit 37. When the unit 37 is operated, the pressure is supplied through a connecting pipe 36 to a hollow ring 35 of sealing means 31. In this manner, the ring 35 closely contacts a motor shaft 5 to interrupt the immersion of high pressure liquid from a pump 16 side through a gap 22 to the motor 11 side. |
