| 摘要 |
The present invention relates to a dual venturi for a combustion device and, particularly, to a dual venturi for a combustion device which can adjust an amount of gas and air supplied to a burner side of a water heater and can efficiently control the quantity of heat by coupling a motor and a damper so as to increase a turn-down ratio so that the damper is rotated by the driving of the motor and the damper simultaneously opens or closes inlets of secondary air and gas. The dual venture includes: a housing having, on one side thereof, a discharge part coupled to a turbo fan, and having, on the inner side thereof, a predetermined space for allowing gas and air to flow therein; an air supply unit divided by a first partition wall (130) on the inner side of the housing into a first air supply unit and a second air supply unit; a gas supply unit formed on one lateral side of the housing and divided by a second partition wall into a first gas supply unit having a first opening part so as to be connected with the first air supply unit and a second gas supply unit having a second opening part so as to be connected with the second air supply unit; and an opening and closing means for blocking a flow of secondary air and secondary gas by blocking the second air supply unit and the second opening part when a combustion device needs a low quantity of heat, and for opening the second air supply unit and the second opening part when a high quantity of heat is needed. |
