Exhaust structure for clothes dryer in apartment building

1. An exhaust structure for a clothes dryer in an apartment building, comprising:

at least one riser pipe mounted in a vertical direction crossing every floor of a building to discharge exhaust gas;

a plurality of branch pipes branched from the riser pipe to a household in the every floor to guide exhaust gas from the household to the riser pipe;

a fan mounted above a top of the riser pipe, the fan operating in proportion to the amount of exhaust gas in the riser pipe,

wherein at least one of the plurality of branch pipes is configured as a branch pipe for a dryer to guide the exhaust gas from the clothes dryer provided in the household to the riser pipe;

a first pressure sensor to sense a pressure in the riser pipe; and

a second pressure sensor to sense a pressure in each of the plurality of branch pipes.

2. The exhaust structure according to claim 1 , further comprising:

a motor to apply a driving force to the fan;

and

a motor controller to control operation of the motor according to a pressure sensed by the first pressure sensor.

3. The exhaust structure according to claim 2 , wherein the motor controller controls operation of the motor according to the amount of exhaust gas in the riser pipe measured based on the pressure sensed by the first pressure sensor.

4. The exhaust structure according to claim 1 , wherein each of the plurality of branch pipes has at least one of a backflow preventive damper to prevent backflow of the exhaust gas and a fire damper therein.

5. The exhaust structure according to claim 1 , wherein each of the plurality of branch pipes has at least one of a lint filter to filter lint and a carbon monoxide filter to filter carbon monoxide therein.

6. The exhaust structure according to claim 5 ,

wherein the second pressure sensor provided in front of the lint filter to sense a pressure in each of the plurality of branch pipes.

7. The exhaust structure according to claim 6 , further comprising:

a filter controller to determine whether the lint filter is blocked based on the pressure sensed by the second pressure sensor.

8. The exhaust structure according to claim 7 , wherein the filter controller determines whether the lint filter is blocked by comparing the sensed pressure with a reference pressure.

9. The exhaust structure according to claim 8 , wherein when the lint filter is blocked, the filter controller informs a user visually and acoustically that the lint filter is blocked.

10. The exhaust structure according to claim 1 , further comprising:

a drain structure provided under the riser pipe to drain water condensed from the exhaust gas.

11. The exhaust structure according to claim 10 , further comprising:

an outdoor air pipe connected to a lower portion of the riser pipe, the outdoor air pipe communicating with an exterior.

12. The exhaust structure according to claim 1 , wherein the plurality of branch pipes are connected to the riser pipe with a predetermined downward inclination.

13. The exhaust structure according to claim 1 , wherein at least one of the plurality of branch pipes is configured as a branch pipe for kitchen or a branch pipe for bathroom which is connected to the branch pipe for dryer.

14. The exhaust structure according to claim 13 , wherein the branch pipe for kitchen or the branch pipe for bathroom has a backflow preventive damper to prevent backflow of the exhaust gas from the clothes dryer therein.

15. The exhaust structure according to claim 14 , wherein the branch pipe for kitchen or the branch pipe for bathroom further has a fire damper therein.

16. The exhaust structure according to claim 13 , wherein the branch pipe for dryer has a constant air volume damper therein.

17. The exhaust structure according to claim 16 , wherein the branch pipe for dryer has at least one of a lint filter to filter lint and a carbon monoxide filter to filter carbon monoxide therein.