Centrifugal compressor driven by high-speed motor and air blower

The utility model relates to a centrifugal compressor driven by a high-speed motor and an air blower. In the prior art, in a conventional centrifugal compressor, leaked compressed gas which comes fromthe back surface of an impeller of the centrifugal compressor and has a high temperature of 100-170 DEG C heats a bearing so as to exceed the heat-resistant temperature of the bearing. In the prior art, a bearing is far away from an impeller in order to solve the problem. As a result, the problems that the whole rotor is lengthened, the critical rotating speed of the rotor is reduced, the rotor cannot operate at a high speed, and sufficient output pressure cannot be obtained are solved. According to the technical scheme, the passage for discharging the leaked compressed gas is additionally arranged, so that the amount of the high-temperature gas leaked to the bearing can be reduced. And finally, the following effects can be achieved: the length of the rotor is shortened, the critical rotating speed is increased,