Axial flow compressor

1. An axial flow compressor for compressing a working fluid, comprising:

an electric motor including a rotating shaft;

a compression portion including a driving shaft connected without a speed-up gear to the rotating shaft of the electric motor and a rotor rotating together with the driving shaft, the compression portion driving the driving shaft and thereby compressing a working fluid; and

a velocity reducing portion having a space for reducing a flow velocity of a working fluid discharged from a discharge opening of the compression portion, wherein:

the rotating shaft of the electric motor is connected to an end of the driving shaft on the side of the discharge opening; and

the velocity reducing portion is disposed so as to surround the electric motor.

2. The axial flow compressor according to claim 1 , wherein the velocity reducing portion extends beyond the electric motor in the axial direction of the driving shaft.

3. The axial flow compressor according to claim 1 , wherein the driving shaft of the compression portion and the rotating shaft of the electric motor are connected by a vibration damping portion.

4. The axial flow compressor according to claim 2 , wherein the driving shaft of the compression portion and the rotating shaft of the electric motor are connected by a vibration damping portion.