| 摘要 |
<p>PURPOSE:To facilitate capacity control in a capacity controller where suction vanes disposed in a casing on a suction side of a centrifugal impeller is opened or closed for capacity control by providing a bypass mechanism for bypassing discharge gas toward the suction side in association with the opening or closing operation of the suction vanes. CONSTITUTION:During operation in a turbocompressor, refrigerant gas sucked into a casing 1A on a suction side reaches an impeller 13 through a plurality of suction vanes 10a, 10b, where a pressure of the refrigerant gas is increased to be discharged. The suction vanes 10a, 10b are drivingly opened or closed according to a load by a control motor or the like so that a suction gas quantity is regulated for capacity control. When a load is reduced and the suction vanes 10a, 10b are closed to the vicinity of surging, a rod 15 is opened against a spring 14 by a cam 12 fixed to a vane driving shaft 11. Consequently, compressed gas is bypassed toward the suction vanes 10a, 10b from a gas inlet 16a through a gas outlet.</p> |
