Structure for cooling leakage air of centrifugal compressor adopting high-speed motor

The invention relates to an improved structure of a compressor or an air blower, in particular to a structure for cooling leakage air of a centrifugal compressor adopting a high-speed motor. A runner is formed in a shell (5) on the back face of an impeller (2) of the centrifugal compressor and a centrifugal air blower adopting the high-speed motor, or/and an impeller shaft seal (6) is internally provided with a runner. Cooling liquid is led into the runner and cools air leaking from the back face of the impeller (2). The cooled leakage air cools an air bearing (7), and the cooled leakage air is led into a gap between a motor rotor (9) and a motor stator to cool the motor (8). Thus, a gap between the seal and the bearing does not need to be reserved, and the length of rotors of the compressor and the air blower can be reduced so that the rotating speed of the rotors can be increased. The air usage amount of compressed air can be greatly reduced, and the work efficiency of the whole compressor is improved. 本发明涉