| 摘要 |
<p>The axial cross-sectional area (B) of a concave portion (26b) is greater than a first channel area (A) at a portion where one opening of the channel and the concave portion overlap, and a second channel area (C) where the concave portion (26b) opens into a compression chamber, whereby the constricting of the channel area to cause resistance is eliminated. Therefore, the pressure of a back-pressure chamber (22) is prevented from exceeding the pressure of a communicating compression chamber (10), and the force exerted on the sliding surfaces of a fixed scroll (11) and a turning scroll (12) is prevented from increasing, improving reliability, particularly during high-speed and high-load operation.</p> |
