| 摘要 |
PURPOSE:To form a seal part having a sufficiently large sealing area and decrease internal leak for enhancement of the efficiency by forming a flat surface at the periphery of each of a plurality of rotors engaged by one another, wherein the flat surface is arranged so that it approaches to or slides on the inner surface of a casino. CONSTITUTION:In a casing 5 provided with a suction hole 6 and discharge hole 7, a plurality of threaded rotors 1a, 1b meshing with each other through threaded grooves 3a, 3b are borne in such a way as rotating synchronously. The rotors 1a, 1b are rotated through rotary shafts 2a, 2b, and the suction, compression. and discharge of the fluid are conducted through utilization of the capacity change of the spaces 11, 12 which are bounded by the rotors 1a, 1b and easing 5 in between. Therein a flat surface is formed on the peripheral surface of each rotor 1a, 1b as approaching to or sliding with the inner surface of the easing 5. Thereby a seal part is formed which has a sufficiently large sealing area. |
