| 摘要 |
<p>PURPOSE:To make the movement of a movable wall part smooth and prevent delay in movement by interposing rotors between the movable wall part for changing the passage width of diffuser part and a supporting face, and providing a seal member at a part excluding the supporting face so as to dissolve friction with the movable wall part. CONSTITUTION:The optimum passage width B of a diffuser part 26 is computed by a control unit 34 from the air flow quantity passing a centrifugal compressor 22 and a pressure ratio between an inlet and an outlet. The rod 33a of an actuator 33 is moved forward/backward by the control unit 34 so as to move a movable wall part 29 along the supporting face 27a of a wall part 27 to set the passage width B of the diffuser part 26 to the optimum value. Since three balls 31 are interposed between the movable wall part 29 and the supporting face 27a of the wall part 27 on one side, the movable wall part 29 can be moved smoothly. A seal member 32 is further interposed between the back face 29a of the movable wall part 29 and the opposed face 27b of the wall part 27 excluding the supporting face 27a of the wall part 27 along which the movable wall part 29 is slided. Friction and delay in movement can be thereby prevented.</p> |
