| 摘要 |
A variable geometry turbine having a turbine wheel (5), an inlet passageway (9), a movable wall member (11) being moveable axially to vary the width of the inlet passageway, an annular seal (127) being mounted to one of the movable wall member (11) and an adjacent housing member (103) to provide a seal between adjacent surfaces of the movable wall member (11) and housing member(103) respectively, wherein a bypass passage (150) is provided in the other of said movable wall member (11) and housing member (103), the bypass passage (150) extending from an inlet bypass port (151) to an outlet bypass port (152), said inlet and outlet bypass ports (151, 152) being axially spaced from each other and provided in said adjacent surface of said other of the movable wall member (11) and housing member (103), arranged such that as the movable wall member (11) moves axially, the annular seal (127) moves axially relative to the inlet and outlet bypass ports (151, 152) so as to vary the extent of flow that may pass from a region of the cavity inboard (113) of the seal, through the bypass passage (150). |
