Air vent device for vehicle

1. An air vent device for a vehicle, comprising:

an air duct being a single passage where air flows;

a partition wall mounted on an air discharge portion of the air duct and configured to divide the air discharge portion into a main vent and an auxiliary vent;

a plurality of horizontal wings disposed upstream of the partition wall with respect to a flow path of the air in an interior of the air duct, the plurality of horizontal wings being vertically pivotable together due to manipulation of a main knob and configured to adjust a vertical wind direction of air; and

an air volume control wing included in the plurality of horizontal wings and configured to distribute an air volume discharged into an interior of the vehicle through the main vent and an air volume discharged into the interior of the vehicle through the auxiliary vent,

wherein the air volume control wing includes a flat wing arranged parallel to other horizontal wings of the plurality of horizontal wings, and a guide wing bent downward to extend from a rear end portion of the flat wing at a predetermined angle,

wherein the partition wall is mounted to be closer to the auxiliary vent than the main vent in the air discharge portion of the air duct such that a size of the main vent is formed to be larger than that of the auxiliary vent, and a distance between a distal rear end of the guide wing and a top of the air duct is greater than a distance between the distal rear end of the guide wing and a bottom of the air duct, and

wherein the guide wing partially blocks air flow through the auxiliary vent when the horizontal wings are rotated in a first direction, and the guide wing is disposed substantially parallel with the air duct and above the partition wall when the horizontal wings are fully rotated in a second direction, the second direction being opposite to the first direction.

2. The air vent device of claim 1 , wherein:

the air volume control wing is located behind the partition wall and pivoted at an angle for discharging the air upward;

when the air volume control wing is arranged in a horizontal state, the flat wing is located at a position that is higher than that of the partition wall; and

when the air volume control wing is pivoted at an angle for discharging the air downward, the flat wing is located to face a rear distal end of the partition wall.

3. The air vent device of claim 1 , wherein when the plurality of horizontal wings including the air volume control wing are pivoted at an angle for discharging the air upward, a ratio of a length ranging from a distal rear end of the guide wing to a top surface of the air duct to a length ranging from the distal rear end of the guide wing to a bottom surface of the air duct is set as a ratio of 95:5.

4. The air vent device of claim 3 , wherein the plurality of horizontal wings including the air volume control wing are pivoted upward at an angle of about 25° so as to discharge the air upward in a horizontal arrangement state.

5. The air vent device of claim 1 , wherein when the plurality of horizontal wings including the air volume control wing are arranged in a horizontal state so as to discharge the air in a linear direction, a ratio of a length ranging from a distal rear end of the guide wing to atop surface of the air duct to a length ranging from the distal rear end of the guide wing to a bottom surface of the air duct is set as a ratio of 80:20.

6. The air vent device of claim 1 , wherein when the plurality of horizontal wings including the air volume control wing are pivoted at an angle for discharging the air downward, a ratio of a length ranging from a distal rear end of the guide wing to atop surface of the air duct to a length ranging from the distal rear end of the guide wing to a bottom surface of the air duct is set at a ratio of 65:35.

7. The air vent device of claim 6 , wherein the plurality of horizontal wings including the air volume control wing are pivoted downward at an angle of about 25° so as to discharge the air downward in a horizontal arrangement state.

8. The air vent device of claim 1 , wherein a first nozzle cover on which the main knob is mounted is installed at an outlet of the main vent, and a second nozzle cover on which a dummy knob is mounted is installed at the auxiliary vent.

9. The air vent device of claim 8 , wherein the main knob includes a knob body slidably mounted on the first nozzle cover, and a knob bar formed in a rear end portion of the knob body and connected to one among the plurality of horizontal wings.

10. The air vent device of claim 8 , wherein the first nozzle cover includes:

a quadrangular external nozzle frame having pivot shafts which are formed on a top surface and a bottom surface of the external nozzle frame and engaged with an upper portion and a lower portion of the main vent;

a quadrangular internal nozzle frame disposed to be spaced apart from an inner surface of the external nozzle frame;

a plurality of connection bars configured to integrally connect the external nozzle frame to the internal nozzle frame; and

a main knob mounting bar connected between an upper portion and a lower portion of the internal nozzle frame.

11. The air vent device of claim 10 , wherein front-rear lengths of an upper bar and a lower bar of the internal nozzle frame are formed to be smaller than those of a left bar and a right bar of the internal nozzle frame so as to secure directionality of a vertical wind direction of the air.