| 摘要 |
<p>PURPOSE:To widen a passage area despite a small size and improve turbine efficiency as well as to make a manufacturing process ever so easy, by casting a partition plate halving a scroll passage solidly to a turbine housing, and setting up an on-off valve in side of these scroll passages. CONSTITUTION:A turbine scroll 4 is divided into two scroll passages (a) and (b) by a partition plate 6 consisting of a heat resisting metal, and an of-off valve 7 is set up in the one side scroll passage (a). And, a lever 10 is coupled with a shaft 21 of the on-off valve 7, and this lever 10 is driven by a solenoid actuator 9. And, an electric signal out of the pressure sensor 8 installed in an inlet of the turbine scroll 4 is inputted into an electronic controller 11, and when this pressure becomes less than the specified value, this solenoid actuator 9 is excited, having a rod 9a projected, the scroll passage (a) is closed by the on-off valve 7. With this constitution, inlet pressure in the scroll passage (b) is made higher, whereby a drop in rotational frequency of a turbine rotor 12 is checked.</p> |
