| 摘要 |
PROBLEM TO BE SOLVED: To prevent the backflow of combustion exhaust gas from a combustion machine in a combustion operating state to combustion machines in non-combustion operating states through a collected exhaust pipe.SOLUTION: In a combined combustion device having a plurality of combustion machines 2 each having a burner 4, a blowing fan 5, a collected exhaust pipe 10 and for coupling the plurality of combustion machines 2, and check valves 7 opened by the rotation of the blowing fan 5 for preventing the backflow of the combustion exhaust gas to the respective combustion machines 2 from the collected exhaust pipe 10 in the case that a part of the combustion machines 2 of the plurality of combustion machines 2 is in a combustion operating state and the other combustion machines 2 are continuously in non-combustion operating states for a time not shorter than a predetermined operation stop reference time, the blowing fans 5 of the other combustion machines 2 are rotated in a certain time. |
