Impeller rotor seal runner with divergent guide surface

An apparatus for an aircraft powerplant, comprising:

• an impeller rotor configured to rotate about an axis, the impeller rotor including a plurality of fluid circuits arranged circumferentially about the axis within the impeller rotor, and each of the plurality of fluid circuits including a first outlet passage, a second outlet passage and an inlet passage fluidly coupled to the first outlet passage and the second outlet passage in parallel;
• and
• a seal runner projecting axially out from the impeller rotor to a distal end of the seal runner, the seal runner including a bore, a plurality of ports, an inner guide surface and an outer land surface, the seal runner extending circumferentially about the axis and radially between the inner guide surface and the outer land surface, each of the plurality of ports fluidly coupling the first outlet passage of at least one of the plurality of fluid circuits to the bore, the inner guide surface forming a radial outer peripheral boundary of the bore, the inner guide surface radially diverging away from the axis as the inner guide surface extends axially away from the impeller rotor, and the inner guide surface angularly offset from the axis by an angle less than fifteen degrees;
• the seal runner comprising an endwall, a sidewall and a rim, the sidewall projecting axially out from the endwall to the distal end of the seal runner, and the rim projecting radially out from the sidewall to an outer end of the rim, wherein a flat of the rim at the outer end of the rim engages a flat of the impeller rotor.

An apparatus for an aircraft powerplant, comprising:

• an impeller rotor configured to rotate about an axis, the impeller rotor including a plurality of fluid circuits arranged circumferentially about the axis within the impeller rotor, and each of the plurality of fluid circuits including a first outlet passage, a second outlet passage and an inlet passage fluidly coupled to the first outlet passage and the second outlet passage in parallel;
• a seal runner projecting axially out from the impeller rotor to a distal end of the seal runner, the seal runner including a bore, a plurality of ports, an inner guide surface and an outer land surface, the seal runner extending circumferentially about the axis and radially between the inner guide surface and the outer land surface, each of the plurality of ports fluidly coupling the first outlet passage of at least one of the plurality of fluid circuits to the bore, the inner guide surface forming a radial outer peripheral boundary of the bore, the inner guide surface radially diverging away from the axis as the inner guide surface extends axially away from the impeller rotor;
• and
• a lip seal circumscribing and radially sealingly engaging the outer land surface, the lip seal axially overlapping the inner guide surface;
• wherein the seal runner comprises:
• an endwall;
• a sidewall projecting axially out from the endwall to the distal end of the seal runner;
• and
• a rim projecting radially out from the sidewall to an outer end of the rim,
• wherein the rim is seated in a recess in the impeller rotor;
• and
• wherein the rim comprises a flat disposed at the outer end of the rim, and the flat of the rim contacts a flat of the impeller rotor.