Reverse direction bearing cooling flow path for a cabin air compressor

A compressor comprising:

• a compressor rotor configured to compress air;
• a motor for driving the compressor rotor, the motor and compressor rotor disposed about a common axis, the motor comprising:
• a rotor shaft coupled to the compressor rotor and configured to drive the compressor rotor, the rotor shaft comprising a plurality of orifices;
• and
• a thrust shaft disposed at an opposite end of the motor from the rotor shaft;
• a tie rod disposed on the common axis and extending through the rotor shaft, thrust shaft, and the compressor rotor, the tie rod axially retaining the compressor rotor at a forward end and the motor at an aft end;
• a first journal bearing disposed concentrically about the common axis to radially support the rotor shaft, wherein the first journal bearing is disposed about the rotor shaft;
• a journal bearing support disposed concentrically about the first journal bearing;
• a cooling fluid inlet disposed adjacent to the journal bearing support and in fluid communication with the first journal bearing;
• and
• an annular heat shield, the annular heat shield and journal bearing support defining a first cavity therebetween, the first cavity open to the cooling fluid inlet;
• wherein the journal bearing support comprises an opening at an inner diameter opening to the first cavity and the journal bearing and the plurality of orifices of the rotor shaft;
• and
• wherein the opening is disposed adjacent to a forward end of the first journal bearing.