| 摘要 |
PURPOSE:To provide for good pneumatic bearing performance by forming many communication holes on a cylindrical turning casing which is rotatably fitted in a casing, each of said communication holes consisting of an air sump which is formed at the opening on the internal side thereof and a small diameter hole which is formed at the opening on the external side thereof. CONSTITUTION:A displacement type rotary compressor has a casing 1 which contains a center housing 2 having a cylindrical internal peripheral face 2a and inside the casing 1 a turning sleeve 5 is rotatably placed. The turning sleeve 5 eccentrically contains a rotor 7 having a plurality of vanes 17 as slidable in the radial directions. Compressed air is guided into the clearance between the turning sleeve 5 and the casing 1 via a plurality of communication holes 9 which are formed on the turning sleeve 5, whereby forming a pneumatic bearing. Each of the through-holes 19 consists of both a reamed air sump 20 which is formed at the internal opening part 19a and a small diameter hole which is formed at the external opening part 19b. The performance of the pneumatic bearing may be thereby improved remarkably. |
