| 摘要 |
PURPOSE:To enhance a sealing effect so as to improve volumetric efficiency, by forming a hole, communicating with high pressure space in an enclosed vessel, in a scroll groove of fixed and turning scrolls so that high pressure gas is introduced to each scroll groove forcing each scroll to be brought into press contact. CONSTITUTION:An opening 2a of a frame 2, provided being arranged in an enclosed vessel 1, provides a main shaft 3 to be rotatably arranged, while the main shaft 3 mounts a centrifugal pump 3a and a rotor 5. And a turning scroll 7 is rotatably supported to a crankshaft part 3b formed in an upper part of the main shaft 3, while a fixed scroll 8 is fixed to a peripheral protrusion part 2b of the frame 2. In the above constitution, a scroll groove 7b of the turning scroll 7 forms a small hole 7d communicating with high pressure space 10 formed between an end plate 7a and the crankshaft part 3b. While a scroll groove 8b of the fixed scroll 8 forms a small hole 8d communicating with an oil reservoir 11 on an end plate 8a.
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