| 摘要 |
<p>PURPOSE:To secure a discharge passage having a larger discharge area compared with the conventional one and a desired defined compression ratio and improve compression efficiency by providing a notched part which makes a particular contact point a reference, on the inner face of each of the semi-circular arc parts on the end sides of moving and stationary blades. CONSTITUTION:Notched parts 5 are provided on the inner faces of the semi-circular arc parts 1b, 2b on the end sides of a stationary blade 1 and a moving blade 2. The notched parts 5 are directed to small semi-circular arcs 1a, 2a side starting from contact points A1, A2 which are brought into contact with the outer peripheries of the semi-circular arcs 1a, 2a on the ends of the opposite side blades when the pressures of end compression chambers 6, 7 reached pressures which provide a desired pressure ratio. Thereby, a defined compression ratio can be obtained accompanying the revolution of the revolving scroll 2 while, when a revolving angle becomes larger than the angle which forms the end compression chambers 6, 7, the semi-circular arc 1b and the small semi-circular arc 2a, and the semi-circular arc 2b and the small semi-circular arc 1a which have been in contact respectively, are separated permitting both chambers 6, 7 to be simultaneously connected to a discharge port 4, to rapidly discharge a fluid from the discharge port 4 through a space which is made larger by the formation of the notched parts 5, 5 after design compression ratio, improving efficiency.</p> |
