Air/fuel ratio control means for dual fuel burners

Claim 2

In a burner of the type having a combustion chamber, fuel inlet means and air inlet means for admission of fuel and air to the combustion chamber, metering valve means in said fuel inlet means and damper means in said air inlet means, and a linkage between said metering valve means and said damper means, the improvement comprising means permitting lost motion in said linkage for permitting said metering valve means to be partially opened while the damper means remains closed and for opening said damper means only after said metering valve has been opened to a predetermined extent.

Claim 3

The improvement of claim 1 wherein said lost motion means comprises slot means slidably receiving rod means of said linkage for allowing travel of said rod means in said slot while said damper means remains closed.

Claim 4

In a burner of the type having a combustion chamber, fuel inlet means and air inlet means for admission of fuel and air to the combustion chamber, metering valve means in said fuel inlet means and damper means in said air inlet means, and a linkage between said metering valve means and said damper means, the improvement comprising means permitting lost motion in said linkage for permitting said metering valve means to be partially opened while the damper means remains closed and for opening said damper means only after said metering valve has been opened to a predetermined extent, said damper means comprising a flat generally rectangular damper body, a leading edge portion bent at an obtuse angle with respect to said body and a following edge portion bent at an obtuse angle with respect to said body; said edge portions being bent in opposite directions with respect to said body.

Claim 5

In a burner of the type having a combustion chamber, fuel inlet means and air inlet means for admission of fuel and air to the combustion chamber, metering valve means in said fuel inlet means and damper means in said air inlet means, and a linkage between said metering valve means and said damper means, the improvement comprising means permitting lost motion in said linkage for permitting said metering valve means to be partially opened while the damper means remains closed and for opening said damper means only after said metering valve has been opened to a predetermined extent, said damper means comprising a flat generally rectangular damper body, a leading edge portion bent at an obtuse angle with respect to said body and a following edge portion bent at an obtuse angle with respect to said body; said edge portions being bent in opposite directions with respect to said body.

Claim 6

The improvement of claim 3 wherein said fuel inlet means includes a gaseous fuel supply line and a liquid fuel inlet line, the metering valve means comprising a valve in said gaseous fuel supply line and a second valve in said liquid fuel inlet line, said valves being coupled for concordant actuation.

Claim 7

A linkage for coordinating the opening of an air damper in a burner with the opening of two fuel supply valves comprising shaft means coupled to said fuel supply valves for rotation corresponding to opening and closing motion of the valves, crank means fixed on said shaft means, a linking rod pivotally secured at one end to said crank means, the other end of said linking rod being slidably and pivotally received in a slot defined in means fixed to said air damper for limited movement of said linking rod while the air damper remains stationary, one of said valves being actuated by the rotation of a member having a camming surface in contact with a piston of said one valve.

Claim 8

A linkage for coordinating the opening of an air damper in a burner with the opening of two fuel supply valves comprising shaft means coupled to said fuel supply valves for rotation corresponding to opening and closing motion of the valves, crank means fixed on said shaft means, a linking rod pivotally secured at one end to said crank means, the other end of said linking rod being slidably and pivotally received in a slot defined in means fixed to said air damper for limited movement of said linking rod while the air damper remains stationary, one of said valves being actuated by the rotation of a member having a camming surface in contact with a piston of said one valve.

Claim 9

The linkage of claim 5 wherein said means fixed to said air damper is an angle having a leg extending generally perpendicular to a body portion of said damper, said slot being defined in said leg.

Claim 10

An air damper for a burner having a flat rectangular body, and two opposite edge portions integrally formed with said body and extending parallel to the axis of rotation of said damper, each said edge portion being bent to form an obtuse angle with respect to the plane of said body, said edge portions extending in generally opposite directions with respect to said body, and means secured to said body and having a leg extending generally perpendicular to said body, said leg means defining a slot extending generally perpendicular to said body.

Claim 11

An air damper for a burner having a flat rectangular body, and two opposite edge portions integrally formed with said body and extending parallel to the axis of rotation of said damper, each said edge portion being bent to form an obtuse angle with respect to the plane of said body, said edge portions extending in generally opposite directions with respect to said body, and means secured to said body and having a leg extending generally perpendicular to said body, said leg means defining a slot extending generally perpendicular to said body.