Vacuum cleaner with detachable cord reel unit

1. A vacuum cleaner, comprising:

a main body;

a brush assembly connected to the main body; and

a cord reel unit attachable to and detachable from a discharging portion of the main body, the cord reel unit comprising a power cord and a cooling fan formed therein;

wherein the cooling fan is configured to stop driving automatically when the cord reel unit is mounted in the main body,

wherein the power cord is configured to be cooled by an air stream discharged through the discharging portion, and

wherein the cooling fan is configured to start driving automatically to cool the power cord when the cord reel unit is detached from the main body.

2. The vacuum cleaner of claim 1 , wherein:

the discharging portion is recessed inward the main body so that the cord reel unit is mounted therein; and

the discharging portion comprises a hooking portion formed thereon to secure the cord reel unit in place.

3. The vacuum cleaner of claim 2 , wherein the cord reel unit comprises a supporting portion provided on the cord reel unit to contact an inner surface of the hooking portion to releasably attach the cord reel unit to the discharging portion.

4. The vacuum cleaner of claim 1 , wherein the cord reel unit comprises:

a motor comprising a motor shaft driving the cooling fan;

a connecting pipe surrounding the motor shaft;

a reel comprising the power cord, the reel being connected to an outer circumference of the connecting pipe; and

a front cover and a rear cover configured to cover the cooling fan, the motor, the connecting pipe, and the reel,

wherein the reel and the motor shaft are configured to be rotated independently from each other.

5. The vacuum cleaner of claim 4 , wherein:

the power cord comprises a power input terminal and a plug; and

the rear cover comprises:

a feed port through which the plug is configured to be drawn out; and

a plug securing portion to secure the plug in place.

6. The vacuum cleaner of claim 4 , wherein the connecting pipe comprises:

a tubular bearing member; and

a flange connected to an end of the tubular bearing member.

7. The vacuum cleaner of claim 4 , further comprising a switch formed on an outer surface of the front cover or the rear cover, the switch being configured to:

drive the cooling fan when the cord reel unit is detached from the main body; or

stop the cooling fan when the cord reel unit is attached to the main body.

8. The vacuum cleaner of claim 6 , wherein the tubular bearing member of the connecting pipe extends through a reel center hole, and is thereby rotatably connected to the reel.