To prevent a supply gas amount to a burner 2 from being lowered when a turbo fan is used as a combustion fan 12 and an inner pressure of a combustion casing 1 is raised by closing of an air supply and exhaust passage and gas injection from a gas nozzle 7a is restrained.
In the forced air supply type combustion device, a target rotational frequency of the combustion fan 12 set in accordance with a required combustion amount of the burner 2 is increased and corrected in accordance with increase of a closing degree of the air supply and exhaust passage, and a target current of a gas proportional valve 9 set in accordance with the required combustion amount is increasingly corrected in correspondence with increase of the closing degree. The smaller the target rotational frequency and the target current are, the larger the increase and correction amounts of the target rotational frequency and the target current when the closing degree is increased are.
| JPH07324730A | 1995-12-12 | |||
| JP2003240229A | 2003-08-27 | |||
| JPS63134239U | 1988-09-02 |
Susumu Hori
Takeshi Sagi
Kenichi Homma
Tsuyoshi Kagaya