US 12,276,421 B2
Collective exhaust system
Takahide Hasegawa, Kakogawa (JP); and Atsushi Ushio, Akashi (JP)
Assigned to NORITZ CORPORATION, Hyogo (JP)
Filed by NORITZ CORPORATION, Hyogo (JP)
Filed on Jun. 20, 2022, as Appl. No. 17/844,690.
Claims priority of application No. 2021-103863 (JP), filed on Jun. 23, 2021.
Prior Publication US 2022/0412558 A1, Dec. 29, 2022
Int. Cl. F23N 5/24 (2006.01)
CPC F23N 5/245 (2013.01) [F23N 2225/10 (2020.01); F23N 2225/20 (2020.01); F23N 2233/06 (2020.01); F23N 2235/04 (2020.01); F23N 2241/04 (2020.01)] 4 Claims
OG exemplary drawing
 
1. A collective exhaust system comprising:
a plurality of combustion devices comprising blowing parts and exhaust pipes;
a collective exhaust duct to which the exhaust pipes of the plurality of combustion devices are respectively connected; and
check valves respectively provided between the exhaust pipes and the collective exhaust duct,
wherein the collective exhaust system is configured to detect a closing failure of the check valves by performing, in a non-combustion state where one of the blowing parts of the plurality of combustion devices is stopped and all the other blowing parts are driven with a predetermined blower capacity, a backflow determination from the collective exhaust duct to the combustion device with the stopped blowing part, and by performing the backflow determination for the plurality of combustion devices in the non-combustion state.