DIAPHRAGM SEAL PLATE

A first annular seal (46) is mounted on the housing (10) and extends into the space (32) between the compressor (26) and the turbine wheel (16). The seal (46) includes a main sealing and support section (54) adjacent the compressor (26) and an insulating section (86) adjacent the turbine wheel (16). The insulating section (86) is mounted on and generally spaced from the main support section (54). A peripheral groove (66) opens axially towards the turbine wheel (16) and is located at a radially outer extremity of the first seal (46). The groove (66) includes a first and second wall, with the first wall (70) located radially inward of the second wall (78). A mounting element (68) is attached to a radially inward side (69) of the first wall (70) to form a gap (75) between the first wall (70) and the mounting element (68). A second annular seal (74 ) includes an inner and outer edge. The inner edge (73) is sealingly engaged in the gap (75) and the second edge (79) is secured between a turbine side of the second wall (78) and the housing support (10).