Turbocharger purge seal including axisymmetric supply cavity

A turbocharger (100), comprising

• a bearing housing (123), the bearing housing (123) including an axial bore (120);
• a turbine stage (12) connected to one end of the bearing housing (123);
• a compressor stage (14) connected to an opposed end of the bearing housing (123);
• a rotating assembly (125) including
• a shaft (20) having axis of rotation (21), the shaft (20) rotatably supported in the axial bore (120) via bearings (26, 128),
• a compressor impeller (18) mounted on the shaft (20), and
• an oil flinger (122) disposed on the shaft (20) between the bearings (26, 128) and the compressor impeller (18);
• a stationary insert (134) disposed in the axial bore (120) so as to surround the oil flinger (122), the stationary insert (134) defining a radially outward-facing surface (138);
• a purge seal (160) operatively positioned in an interface (131) between the stationary insert (134) and the oil flinger (122), the purge seal (160) configured to introduce pressurized fluid into the interface (131), and including an annular cavity (150) encircling the radially outward-facing surface (138) of the stationary insert (134), the cavity (150) forming a portion of a fluid path configured to deliver the pressurized fluid to the purge seal (160),
• wherein the stationary insert (134) includes at least one radial bore (139) that opens to both the cavity (150) and the interface (131), and forms another portion of the fluid path.