| 摘要 |
PURPOSE:To prevent a noise from occurring, by having the interconnecting hole installed in a first bearing opposed to the inner wall of a hermetically sealed vessel. CONSTITUTION:A compressive element 3 is provided with a cylinder 5, an upper bearing 6 and a lower bearing 7. An interconnecting hole 12, leading to an upper space 11 of the upper bearing 6 from the inside of a silencer 9, is installed in the cylinder 5, the upper bearing 6 and the lower bearing 7 through. The terminal part 13' is opened to a position to be opposed to the inner wall of a hermetically sealed vessel 1 on an outer circumferential part of the upper bearing. Therefore, high pressure gas jetted out of the interconnecting hole terminal part 13' will not directly collide with a rotator 21 of a power element 2, thus a noise due to vertical vibrations of a turning shaft 32 is preventable. |
