| 摘要 |
PURPOSE:To remarkably decrease gas leaking from a preceding chamber at high pressure to a following chamber at low pressure via a clearance between adapted points so as to prevent a lowering of machine performance, by forming the section of an adapted surface between each spiral unit in an undulated shape thus increasing a contact length of the adapted point. CONSTITUTION:Overlapping a trigonometric sine function on the involute curve of a conventional spiral unit, the section of an adapted surface between spiral units 401 and 402 is formed in an undulated shape. In this way, a contact length of adapted points 410-1, 410-2, 411-1, 411-2 between the two spiral units 401, 402 is considerably increased as compared with the contact length in a conventional case. Accordingly, even if a slight clearance is generated in the adapted points 410-1, 410-2, 411-1, 411-2, a leak of gas, flowing from a preceding chamber at high pressure to a following chamber at low pressure, is remarkably decreased, thus a lowering of performance in a rotary fluid machine can be prevented. |
