Air supply system for a vehicle

An air supply system for vehicles comprising:

• a motor part adapted to rotate a rotary shaft mounted at the center thereof;
• a motor housing adapted to receive the motor part vertically inserted and mounted to the center thereof and having an air flow channel vertically formed on the outer periphery of the motor part;
• an inlet duct coupled to the upper end of the motor housing for guiding air introduced through an inlet thereof to the air flow channel of the motor housing;
• an impeller coupled to the lower end of the rotary shaft for compressing the air while rotating together with the rotary shaft;
• and
• an outlet duct coupled to the lower end of the motor housing for compressing the air passing through the air flow channel of the motor housing by the impeller and discharging the compressed air to an outlet thereof,
• wherein the outlet duct comprises:
• an impeller receiving portion formed on the inner lower end thereof for rotatably receiving the impeller therein and communicating with the air flow channel;
• a diffuser passageway adapted for converting kinetic energy of the air blown through the impeller into pressure, the diffuser passageway having a first passageway extending in a radial direction of the impeller receiving portion and a second passageway extending from the first passageway in an axial direction of the rotary shaft;
• and a volute communicatingly formed on the upper portion of the diffuser passageway for collecting air compressed while passing through the diffuser passageway and sending the collected air toward the outlet.