| 摘要 |
PURPOSE:To remove a slidable part by supporting the thrust load by a pin crank equipped with thrust bearings having a radial bearing which are arranged between the back surface of the edge plate of a turning scroll and a casing and keeping the gap between the both scroll edge plates constant, in the turning scroll. CONSTITUTION:When operation is started, a turning scroll 106 supports the thrust load by with collar having thrust bearings 110 having a radial bearing which are arranged at several positions between the back surface of the edge plate 106a and a casing 102. Therefore, turning movement is performed, keeping a certain gap (c) between the edge plate 106a and the undersurface of a fixed scroll 101. Therefore, the inside of the casing 102 is formed into the vacuum range equal to a suction chamber 101a. Since, in this case, bearings 103, 107, and 110 are sealed by the grease having a low vapor pressure, outside leakage is prevented, and the communication of the above-described vacuum range to the atmospheric-pressure side through a shaft part is cut-off by the bearing apparatus 111. With such constitution, the slidable part between the both scrolls can be removed, and the sealing performance can be improved markedly. |
