Turbo fluid machine

A turbo fluid machine comprising:

• a housing having an impeller chamber, a turbine chamber, a motor chamber located between the impeller chamber and the turbine chamber, a first shaft hole located between the impeller chamber and the motor chamber and communicated with the impeller chamber and the motor chamber, and a second shaft hole located between the motor chamber and the turbine chamber and communicated with the motor chamber and the turbine chamber;
• an electric motor accommodated in the motor chamber;
• an impeller accommodated in the impeller chamber, and configured to compress a cathode gas with rotation of the electric motor so as to supply the cathode gas to a fuel cell;
• a turbine accommodated in the turbine chamber and rotated by exhaust from the fuel cell;
• a drive shaft inserted through the first shaft hole and the second shaft hole, and connecting the electric motor, the impeller, and the turbine;
• and
• a sealing member disposed between the second shaft hole and the drive shaft to seal a gap between the motor chamber and the turbine chamber, wherein
• the sealing member includes a first sealing member and a second sealing member that is located away from the first sealing member and between the first sealing member and the turbine chamber in an axial direction of the drive shaft,
• the drive shaft, the second shaft hole, the first sealing member, and the second sealing member cooperate to form a reservoir in which water contained in the exhaust is stored, and
• the housing has a water discharge passage which is communicated with the reservoir and through which the water is discharged from the reservoir to an outside of the housing,
• wherein the drive shaft further comprises a seal carrier arranged on a portion of the drive shaft,
• wherein the first sealing member is disposed in a first diameter portion of the seal carrier, and the second sealing member is disposed in a second diameter portion of the seal carrier, and
• wherein the seal carrier, the second shaft hole, the first sealing member, and the second sealing member cooperate to form the reservoir.