Patent ID: 11946643
Assignee: NORITZ CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 5:
6. A combustion apparatus comprising:
a combustion mechanism that burns a fuel;
an air blowing fan that supplies air for combustion to the combustion mechanism;
an exhaust vent through which combustion gas in the combustion mechanism is discharged;
a check valve arranged in a supply and exhaust passage from the air blowing fan to the exhaust vent,
the check valve being opened and closed in accordance with a relationship between a gas pressure in the supply and exhaust passage and a biasing force in a closing direction; and
a controller that performs a failure diagnosis for detecting an open failure of the check valve when a phenomenon in which the gas pressure is lower than a predetermined normal pressure range is detected in a diagnosis rotation speed region, the diagnosis rotation speed region being set within a rotation speed range of the air blowing fan in which a degree of opening of the check valve changes with an increase in a rotation speed of the air blowing fan when the check valve is normally opened and closed, wherein
the controller detects a closed failure of the check valve, when a phenomenon in which the gas pressure is higher than the normal pressure range in the diagnosis rotation speed region, at the time of the failure diagnosis.