Plural rate burner apparatus

Claim 2

A burner apparatus operable both at a high rate and at a low rate comprising an orifice member having an orifice for projecting a stream of gaseous fuel from a supply passageway, a tubular mixing member having one end adjacent the orifice member and adapted to receive a projected stream of fuel from the orifice, said mixing member having an opening adjacent the orifice member for allowing passage of air for entrainment in a stream of fuel from the orifice, a grid member over the other end of the mixing member, said grid member having a grid size sufficiently small to retain a flame and minimize flash back at the low rate of operation but sufficiently large to allow substantially free flow of gas at the high rate of operation, a flame sensing element mounted at a position laterally offset from the mixing member adjacent the other end of the mixing member in the path of a low rate flame, and a deflecting member disposed in a spaced position in front of the other end of the mixing member for deflecting a portion of a flame at the high rate of operation toward the flame sensing element.

Claim 3

A burner apparatus as claimed in claim 1 wherein the mixing member extends in a direction which is at least partially in a horizontal direction, and the flame sensing element is mounted above the other end of the mixing member.

Claim 4

A burner apparatus as claimed in claim 1 wherein the deflecting member is a disc mounted transverse to and intersecting an axis extending centrally through the mixing member.

Claim 5

A burner apparatus as claimed in claim 3 wherein the grid member and the disc are perpendicular to the axis of the mixing member.

Claim 6

A burner apparatus as claimed in claim 3 wherein the disc is spaced from the grid such that at a low rate a flame is retained by the grid member and at a high rate a flame is retained adjacent the periphery of the disc.

Claim 7

A burner apparatus as claimed in claim 1 wherein there is included a tubular fire box, and means for mounting the mixing member and flame sensing element longitudinally within the tubular fire box.

Claim 8

A burner apparatus operably both at a high rate and at a low rate comprising an orifice member having a orifice for projecting a stream of gaseous fuel; means for connecting the orifice member to a supply conduit; a tubular mixing member having a horizontal axis and one end adjacent the orifice member; said mixing member adapted to receive a projected stream of fuel from the orifice and having an opening adjacent the orifice member for allowing passage of air for entrainment in a stream of fuel from the orifice; a grid member mounted perpendicular to the axis of the mixing member over the other end of the mixing member; said grid member having a Grid size sufficiently small to retain a flame and minimize flash back at the low rate of operation but sufficiently large to allow substantially free flow of gas at the high rate of operation; a flame sensing element positioned above the other end of the mixing member, a tubular fire box extending coaxially along the axis of the mixing member; means for mounting the orifice member, the mixing member and the flame sensing element within the fire box; a disc coaxial and perpendicular to the axis of the mixing member; said disc having a diameter which is about equal to the diameter of the mixing member; means for mounting the disc spaced in front of the other opening of the tubular member such that a low rate flame extends upward from the grid member impinging upon the flame sensing element and a high rate flame extends radially outward from adjacent the periphery of the disc impinging upon the flame sensing element; and said tubular fire box having a diameter such that a high rate flame impinges upon the interior surface thereof.

Claim 9

A burner apparatus operably both at a high rate and at a low rate comprising an orifice member having a orifice for projecting a stream of gaseous fuel; means for connecting the orifice member to a supply conduit; a tubular mixing member having a horizontal axis and one end adjacent the orifice member; said mixing member adapted to receive a projected stream of fuel from the orifice and having an opening adjacent the orifice member for allowing passage of air for entrainment in a stream of fuel from the orifice; a grid member mounted perpendicular to the axis of the mixing member over the other end of the mixing member; said grid member having a Grid size sufficiently small to retain a flame and minimize flash back at the low rate of operation but sufficiently large to allow substantially free flow of gas at the high rate of operation; a flame sensing element positioned above the other end of the mixing member, a tubular fire box extending coaxially along the axis of the mixing member; means for mounting the orifice member, the mixing member and the flame sensing element within the fire box; a disc coaxial and perpendicular to the axis of the mixing member; said disc having a diameter which is about equal to the diameter of the mixing member; means for mounting the disc spaced in front of the other opening of the tubular member such that a low rate flame extends upward from the grid member impinging upon the flame sensing element and a high rate flame extends radially outward from adjacent the periphery of the disc impinging upon the flame sensing element; and said tubular fire box having a diameter such that a high rate flame impinges upon the interior surface thereof.

Claim 10

A burner apparatus as defined in claim 7 wherein, there is included a plurality of projections extending from side portions of the mixing member parallel to the axis of the mixing member toward the disc.