| 摘要 |
<p>PURPOSE:To minimize the leak of pressure air by forming a chamfered part along the edge of each spiral vane and setting the chamfered part that it is increased with more external peripheral part of the vane and reduced with core internal peripheral part. CONSTITUTION:A vane 8a of a revolving spiral vane part 8 has a chamfered part 8c along the edge. The chamfered part 8c is increased with more external peripheral part 30a of the vane 8 and reduced with more internal peripheral part 30b. Similarly, a fixed spiral vane has such chamfered part. Pressure is increased at the more central point so that the difference between the pressure of compressed air and that in the neighboring section is increased, however, since the internal peripheral part 30b has a less chamfered part, the leak of pressure air may be minimized, whereby maintaining the efficiency. The differential pressure at the external peripheral part 30a is low, on account of which if the amount of chamfer is large, the efficiency may be maintained so that a deformation of an upper end of the vane as a result of bump may be prevented.</p> |
