| 摘要 |
<p>Provided is a gas compressor that supplies high-pressure back pressure to the vanes in the final stage of the compression step. A compressor main body (60) is provided in a housing (10) and has: a rotor (50) in which vane grooves (59) are formed; a cylinder (40) having an inner circumferential surface (41) the contour shape of which encloses the outer peripheral surface (52) of the rotor (50) from the outside; and five plate-like vanes (58), which are inserted into the vane grooves (59), and are provided so as to be capable of receiving back pressure from refrigerant oil (R) supplied from drain grooves (21, 31) to the vane grooves (59), and to protrude toward the inner circumferential surface (41) of the cylinder (40). A compression chamber (43), which compresses indrawn refrigerant gas (G) once per rotation of the rotor (50), is formed in the cylinder main body. The drain grooves (21, 31) communicate with the vane grooves (59) in a prescribed rotational angle range (α) of the rotor (50), and the vane grooves (59) form a closed space in another rotational angle range (β) that excludes the rotational angle range (α) wherein the drain grooves (21, 31) communicate with the vane grooves (59).</p> |
