| 摘要 |
PURPOSE:To enhance the performance of a compressor through the nullification of the final clearance substantially, easily secure the strength of the central part for the enhancement of the reliability, and provide the possibility of easily reducing torque variation in the case the outside diameter of the compressor is made the same. CONSTITUTION:The outer wall transfer point G is set in the first polar coordinates system (X, Y) having the first origin 0, and a circle Cs having a diameter which is the revolutional radius (e), is drawn centering on the first origin 0. The transfer point P is set at a specified contact angle beta on this circle Cs, and the transfer point P is tied with the origin 0 by a straight line (m), and a normal is drawn to the outer wall transfer point G at a certain beginning angle alpha. The intersection C of the straight line (m) with the normal is determined, and in the second polar coordinates system having the second origin which is identical to this intersection C, part of the central part curve is determined which passes the outer wall transfer point G and the transfer point P smoothly and with which the outer wall curve is connected at the outer wall transfer point G smoothly. According to this constitution, the contact angle betacan be lessened, and the wrap angle be secured large.
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