Rotary device

1. A rotary device comprising:

a housing;

an impeller disposed in the housing;

a rotor disposed in the housing and configured to drive the impeller; and

a labyrinth seal disposed between the impeller and the rotor in the housing and configured to control an amount of air injected through the impeller to cool the rotor,

wherein a flow path opening that penetrates through the rotor is formed inside the rotor along a rotational axis of the rotor, and

wherein the labyrinth seal comprises a teeth portion having a predetermined number of steps provided in the labyrinth seal.

2. The rotary device of claim 1 , wherein the rotary device further comprises:

first bearings supporting the rotor;

a second bearing supporting the rotor;

a diffuser fixedly coupled to the housing and supporting the rotor; and

a motor configured to generate rotational power to drive the rotor, and

wherein the housing comprises a first cooling flow path and a second cooling flow path,

wherein the first cooling flow path is formed so that the air injected through the impeller is ejected through the labyrinth seal, the second bearing, the first bearings, and the rotor, and

wherein the second cooling flow path is formed so that the air injected through the impeller is ejected through the diffuser, the motor, and the rotor.

3. The rotary device of claim 2 , wherein the first cooling flow path is formed so that the air injected through the impeller is compressed in the labyrinth seal and then ejected through the second bearing, and the first bearings.

4. The rotary device of claim 2 , wherein the second cooling flow path is formed so that the air injected through the impeller passes through the diffuser and is ejected through the motor.

5. The rotary device of claim 1 , wherein the rotor comprises:

a fastening rod which forms a framework of the rotor;

permanent magnets disposed on the fastening rod and are assembled to the inside of the housing; and

a sleeve member which surrounds the permanent magnets.

6. The rotary device of claim 5 , wherein the impeller is coupled to the rotor by the fastening rod.

7. The rotary device of claim 1 , wherein the teeth portion of the labyrinth seal is formed to be inclined with respect to a direction from the rotor toward the impeller.

8. The rotary device of claim 7 , wherein the teeth portion of the labyrinth seal has a single step.

9. The rotary device of claim 1 , wherein a gap is formed between the labyrinth seal and the rotor.

10. The rotary device of claim 2 , wherein air moving along the first and second cooling flow paths is joined at the flow path opening of the rotor.

11. The rotary device of claim 10 , wherein the air joined at the flow path opening of the rotor is supplied into the impeller.

12. The rotary device of claim 11 , wherein the air supplied to the impeller is recirculated through the first and second cooling paths.

13. A rotary device comprising:

a housing;

an impeller disposed in the housing;

a rotor disposed in the housing and configured to drive the impeller;

first bearings supporting the rotor;

a second bearing supporting the rotor;

a motor configured to generate rotational power to drive the rotor; and

a diffuser fixedly coupled to the housing and supporting the rotor and comprising a labyrinth seal disposed between the impeller and the rotor in the housing, and configured to control an amount of air injected through the impeller to cool the rotor, the first bearings, the second bearing and the motor,

wherein the housing comprises a first cooling flow path, and a second cooling flow path,

wherein a first portion of the air injected through the impeller passes through the labyrinth seal, the second bearing, the first bearings, and the rotor via the first cooling flow path, and

wherein a second portion of the air injected through the impeller passes through the diffuser, the motor, and the rotor via the second cooling flow path.

14. The rotary device of claim 13 , wherein the rotor comprises a flow path opening penetrating through the rotor, and

wherein the first portion and the second portion of the air are joined at the flow path opening of the rotor.

15. The rotary device of claim 14 , wherein the first portion and the second portion of the air joined at the flow path opening of the rotor are re-supplied into the impeller.

16. The rotary device of claim 15 , wherein the first portion and the second portion of the air re-supplied to the impeller are recirculated through the first and second cooling paths.