| 摘要 |
<p>[Problem] To provide a two-stage compression rotary compressor that can provide an inexpensive, highly efficient compression function, and that can also reduce installation space. [Solution] A multistage-compression rotary compressor is provided with first and second rotary compression elements (3, 4) via an intermediate partition plate (5), and the second rotary compression element (4) has an internal medium pressure structure configured from a roller (43) and a vane (44) in contact with the roller (43). Some coolant gas compressed into a high-pressure state by the second rotary compression element is fed into a spring chamber (412) within an upper cylinder (41). A bypass passage (45B) that applies some of the coolant gas with the vane (44) as a back pressure of the vane (44) is provided on the inside of an upper supporting member (45). In order to collect and return oil, which has been fed into a spring chamber (42) through the bypass passage (45B) with gas, to the inside of a sealed vessel (1A), a collection port (51A) opens when the vane (44) advances and a collection passage (51) that communicates with the space within the sealed vessel (1A) is provided inside the intermediate partition plate (5).</p> |
