Dust collecting apparatus for vacuum cleaner and vacuum cleaner including same

1. A dust collecting apparatus for a vacuum cleaner, comprising:

a first cyclone installed in a first case, and configured to separate dust from air introduced together with foreign materials and to discharge the dust to a first dust storage unit;

a second cyclone mounted above the first cyclone, and configured to separate fine dust from the air having dust separated therefrom by the first cyclone, and to discharge the fine dust to a second dust storage unit;

a compression assembly having at least a compression plate configured to compress the dust stored in the first dust storage unit, by at least partially performing a clockwise rotation in one direction along an outer circumferential surface of a second case which accommodates therein the second dust storage unit, and by at least partially performing a counterclockwise rotation in an opposite direction to the clockwise rotation;

a screw rotatably installed above the compression assembly, spirally extended along an outer circumference, and configured to guide collection of dust into the first dust storage unit;

a motor configured to transmit a driving force to the compression assembly such that the clockwise rotation and the counterclockwise rotation of the compression assembly are selectively performed; and

a gear unit installed between the compression assembly and the screw to transmit a rotational force of the compression assembly to the screw, and configured to rotate the screw only in a clockwise direction irrespective of a rotational direction of the compression assembly, wherein an outer circumference of the second case and an inner circumference of the screw are arranged to face each other at a spaced position, and the gear unit includes:

a first gear provided on the outer circumference of the second case and coupled to an upper side of the compression assembly so as to be rotatable together with the compression assembly;

a second gear spaced apart from the first gear and arranged on the inner circumference of the screw; and

a link gear provided between the first and second gears and connected to the first and second gears so as to transmit a rotational force of the first gear to the second gear.

2. The apparatus of claim 1 , wherein the link gear includes:

a first fixed gear arranged to be engaged with the second gear;

a second fixed gear arranged to be engaged with the second gear at a position spaced apart from the first fixed gear;

a third fixed gear installed to be spaced apart from the first and second gears, and arranged to be engaged with the first fixed gear; and

an orbiting gear configured to move to be selectively engaged with one of the second fixed gear and the third fixed gear in an engaged state with the first gear, in order to selectively transmit a rotational force of the first gear to one of the second fixed gear and the third fixed gear.

3. The apparatus of claim 2 , wherein a guide cut-out portion is formed on one surface of the screw in a circular arc shape, at a position spaced apart from the outer circumference of the first gear by a predetermined distance, and

wherein a rotational shaft of the orbiting gear is guided by the guide cut-out portion and moves between the second fixed gear and the third fixed gear along the circular arc shape of the guide cut-out portion.

4. The apparatus of claim 3 , wherein the first to third fixed gears are rotatably fixed to one surface of the screw.

5. The apparatus of claim 3 , wherein the guide cut-out portion is formed on one surface of the screw provided among the first gear, the second fixed gear and the third fixed gear.

6. The apparatus of claim 1 , wherein a guide vane is upward inclined in the one direction on an outer circumference of the screw, so as to collect dust blocked on the outer circumference of the screw to the first dust storage unit, by the clockwise rotation of the screw.

7. The apparatus of claim 6 , wherein the guide vane is provided in plurality, and

wherein the plurality of guide vanes are protruded in a diagonal direction from the outer circumference of the screw, and are spaced apart from each other with a predetermined interval therebetween along the outer circumference of the screw.

8. The apparatus of claim 1 , further comprising a lower cover portion hinge-coupled to the first case to form bottom surfaces of the first and second dust storage units, and the lower cover portion rotated by the hinge such that the dust and the fine dust are simultaneously discharged, thereby simultaneously opening the first and second dust storage units.

9. The apparatus of claim 8 , wherein the lower cover portion includes:

a first cover hinge-coupled to the first case, and configured to open and close an outlet of the first dust storage unit; and

a second cover connected to the first cover so as to open and close an outlet of the second dust storage unit, as the first cover is rotated by the hinge.

10. The apparatus of claim 9 , wherein the compression assembly includes:

a rotation gear rotatably connected to the motor which provides the driving force, and installed to the first cover so as to be exposed to outside of the dust collecting apparatus;

a first rotation portion arranged at an opposite side to the rotation gear on the basis of the first cover, and connected to the rotation gear through the first cover so as to be rotated together with the rotation gear when the rotation gear is rotated; and

a second rotation portion installed at the outer circumference of the second case in a spaced state by a predetermined distance, and formed to be engaged with the first rotation portion when the outlet of the second dust storage unit is closed by the lower cover portion,

wherein the compression plate is a dust compression rotation plate connected to the second rotation portion so as to be rotated together with the first and second rotation portions when the rotation gear is rotated, and configured to compress dust collected at the first dust storage unit while reciprocating.

11. The apparatus of claim 10 , further comprising a dust compression fixing plate fixed to a region between an inner circumferential surface of the first case and an outer circumferential surface of the second case, and configured to induce a reciprocating motion of the dust compression rotation plate and to restrict a movement of dust compressed by the dust compression rotation plate.

12. The apparatus of claim 10 , wherein the first rotation portion is provided with a plurality of protrusions spirally formed from its center;

wherein the second rotation portion is provided with accommodation portions for accommodating end parts of the protrusions, at a lower end thereof; and

wherein the first and second rotation portions are engaged with each other so as to be rotatable simultaneously, as the end parts of the protrusions are inserted into the accommodation portions.

13. The apparatus of claim 2 , wherein

the orbiting gear is configured to move to a position where the orbiting gear engages with the second fixed gear when the compression assembly rotates in the clockwise direction, and

the orbiting gear is configured to move to a position where the orbiting gear engages with the third fixed gear when the compression assembly rotates in the counterclockwise direction.

14. The apparatus of claim 13 , wherein

when the compression assembly rotates in the clockwise direction, the screw is configured to rotate in the clockwise direction by the driving force sequentially transmitted through the first gear, the orbiting gear, the second fixed gear, and the second gear, and

when the compression assembly rotates in a counterclockwise direction, the screw is configured to rotate in the clockwise direction by the driving force sequentially transmitted through the first gear, the orbiting gear, the third fixed gear, the first fixed gear, and the second gear.

15. The apparatus of claim 2 , wherein one of the first fixed gear and the second fixed gear is rotated in the same direction as the second gear.

16. A dust collecting apparatus for a vacuum cleaner, comprising:

a first cyclone installed in a first case, and configured to separate dust from air introduced together with foreign materials and to discharge the dust to a first dust storage unit;

a second cyclone mounted above the first cyclone, and configured to separate fine dust from the air having dust separated therefrom by the first cyclone, and to discharge the fine dust to a second dust storage unit;

a compression plate configured to compress the dust stored in the first dust storage unit by at least partially performing a rotation in a first rotational direction along an outer circumferential surface of a second case which accommodates therein the second dust storage unit, and by at least partially performing a rotation in a second rotational direction opposite to the first rotational direction;

a screw rotatably installed above the compression plate, spirally extended along an outer circumference, and configured to guide collection of dust into the first dust storage unit;

a motor configured to transmit a driving force to the compression plate such that the rotation in the first rotational direction and the rotation in the second rotational direction of the compression plate are selectively performed; and

a plurality of gears installed between the compression plate and the screw to transmit a rotational force of the compression plate to the screw, and configured to rotate the screw only in the first rotational direction irrespective of a rotational direction of the compression plate; wherein the screw includes a guide vane provided on an outer circumference of the screw and inclined upward in the first rotational direction such that the guide vane collects dust blocked on the outer circumference of the screw to the first dust storage unit by the rotation of the screw in the first rotational direction.

17. A dust collecting apparatus for a vacuum cleaner, comprising:

a first cyclone installed in a first case, and configured to separate dust from air introduced together with foreign materials and to discharge the dust to a first dust storage unit;

a second cyclone mounted above the first cyclone, and configured to separate fine dust from the air having dust separated therefrom by the first cyclone, and to discharge the fine dust to a second dust storage unit;

a compression plate configured to compress the dust stored in the first dust storage unit by at least partially performing a rotation in a first rotational direction along an outer circumferential surface of a second case which accommodates therein the second dust storage unit, and by at least partially performing a rotation in a second rotational direction opposite to the first rotational direction;

a screw rotatably installed above the compression plate, spirally extended along an outer circumference, and configured to guide collection of dust into the first dust storage unit;

a motor configured to transmit a driving force to the compression plate such that the rotation of the compression plate in the first rotational direction and the rotation of the compression plate in the second rotational direction are selectively performed;

a plurality of gears installed between the compression plate and the screw to transmit a rotational force of the compression plate to the screw, and configured to rotate the screw only in the first rotational direction irrespective of a rotational direction of the compression plate; and

a lower cover portion hinge-coupled to the first case to form bottom surfaces of the first and second dust storage units, the lower cover portion being configured to rotate by the hinge such that the dust and the fine dust are simultaneously discharged, thereby simultaneously opening the first and second dust storage units.