Oil burner apparatus

Claim 2

Oil burner apparatus comprising a burner pot having a sidewall with an upper edge and a bottom wall, air-opening means in the pot bottom, a blast tube having upper and lower ends and mounted within the burner pot, said upper end of said blast tube being disposed below said upper edge of said burNer pot, a refractory ring extending across the burner pot near the upper edge thereof and spaced from the side of the pot, an inversion cap supported near the upper edge of the burner pot, said refractory ring being located between said blast tube and said inversion cap, a combustion chamber between the inversion cap and the refractory ring, passage means in the pot and in communication with the combustion chamber and with the blast tube below said refractory ring, and means for injecting a combustible mixture of air and fuel upwardly through the blast tube and the refractory ring to impinge on the inversion cap to be burned in the combustion chamber, said inversion cap deflecting any unburned portions of the mixture downwardly through the passage means for reentrainment in the mixture flowing upwardly through the blast tube.

Claim 3

Oil burner apparatus as claimed in claim 1 in which said inversion cap is spaced above the upper edge of the burner pot to define therewith a flame outlet passage from said combustion chamber.

Claim 4

Oil burner apparatus as claimed in claim 1 in which said passage means includes a recirculation chamber below the refractory ring, and a return passage between the combustion chamber and the recirculation chamber and defined by an outer edge surface of said refractory ring and an inner surface of said sidewall of said burner pot.

Claim 5

Oil burner apparatus as claimed in claim 1 including a flame barrier and dispersing screen extending across the burner pot intermediate the height of the blast tube.

Claim 6

Oil burner apparatus as claimed in claim 4 in which said passage means comprises an upper space between the blast tube and the refractory ring and a relatively small lower space between said blast tube and the bottom wall of the burner pot.

Claim 7

Oil burner apparatus as claimed in claim 1 in which said sidewall of the burner pot is cylindrical, said blast tube being cylindrical and concentrically mounted with respect to the sidewall of the pot.

Claim 8

Oil burner apparatus as claimed in claim 1 in which said injecting means comprises an ejector nozzle, pump means for supplying air to and through the nozzle, and oil supply means for directing unpressurized oil to the nozzle, said oil being drawn into the nozzle by the flow of air through the latter.

Claim 9

Oil burner apparatus as claimed in claim 7 in which said oil supply means comprises a reservoir in communication with the atmosphere, pump means for supplying oil to the reservoir, float-controlled means for maintaining the oil in the reservoir at a predetermined level, and passage means extending from the reservoir to the nozzle to direct oil to said nozzle.

Claim 10

Oil burner apparatus as claimed in claim 8 in which said air pump means and said oil pump means comprise an air pump and a liquid pump respectively mounted for operation on a common power-driven shaft.

Claim 11

Oil burner apparatus as claimed in claim 1 in which said injecting means comprises a nozzle and a pumping unit, said pumping unit having a body, an air pump within said body for supplying air at a predetermined low pressure to the nozzle, an oil pump and an oil reservoir within the body, an oil circuit for transmitting pressure oil from the oil pump to the oil reservoir and from said oil reservoir to the nozzle, and means for maintaining the oil delivered to the nozzle at atmospheric pressure, whereby said oil is discharged from said nozzle by the flow of air therethrough.

Claim 12

Oil burner apparatus as claimed in claim 10 including a pressure control valve in the oil circuit whereby oil below a predetermined high level is stopped from reaching the reservoir.

Claim 13

Oil burner apparatus as claimed in claim 11, and including means for controlling the level of oil in the reservoir.

Claim 14

Oil burner apparatus as claimed in claim 10 in which said air and oil pumps are driven by a common shaft, said shaft having a bearing receiving lubricating oil from the oil circuit, said body having a groove encircling the shaft at one end thereof, said aIr pump having an air circuit including a duct communicating with the groove whereby air flowing through said groove acts as an oil seal.

Claim 15

Oil burner apparatus as claimed in claim 4 in which said sidewall of the burner pot is of cylindrical formation, said blast tube being concentric with the cylindrical wall and having a lower end spaced above said bottom wall to provide a radially extending lower passage, and an upper end spaced from the refractory ring to provide a radially extending upper passage, said lower and upper passages forming part of said passage means.

Claim 16

Oil burner apparatus as claimed in claim 14 in which said air-opening means comprises an opening in the bottom wall of the burner pot beneath the blast tube, said injecting means being positioned to direct the combustible mixture through said opening and into the blast tube.

Claim 17

Oil burner apparatus as claimed in claim 14 including oil supply means in which said oil supply means comprises a reservoir in communication with the atmosphere, pump means for supplying oil to the reservoir, float-controlled means for maintaining the oil in the reservoir at a predetermined level, and passage means extending from the reservoir to said nozzle.

Claim 18

Oil burner apparatus as claimed in claim 16 including air pump means in which said air pump means and said oil pump means comprise an air pump and a liquid pump respectively mounted for operation on a common power-driven shaft.

Claim 19

Oil burner apparatus as claimed in claim 15 in which said injecting means comprises a pumping unit having a body, a driven shaft journaled in the body, an air pump operable by the driven shaft, a nozzle directed into the opening in the bottom wall of the burner pot, an air circuit connecting the air pump to the nozzle, an oil pump operable by the driven shaft, said body having a reservoir, an oil circuit for transmitting pressure oil from the oil pump to the reservoir and from said reservoir to the nozzle, and means for maintaining the oil within the oil reservoir at atmospheric pressure.

Claim 20

Oil burner apparatus as claimed in claim 18 in which said air pump supplies primary air to the burner, said primary air inducing secondary combustion-supporting air into the burner through the bottom wall opening.

Claim 21

An oil burner apparatus which comprises a burner jacket having a sidewall extending from an upstream end to a downstream end of said jacket, an upstream end wall spanning said upstream end of said burner jacket, a blast tube having an inlet end and a discharge end and mounted within said burner jacket to define with said sidewall thereof an elongated and generally annular recirculation passage, said discharge end of said blast tube being disposed upstream of said downstream end of said burner jacket and opening generally into a primary combustion zone, a combustible mixture supply means disposed for the supply of a combustible fuel/air mixture generally axially into said inlet end of said blast tube through an opening in said upstream end wall of said burner jacket, means forming a first transfer passage for the transfer of gaseous material into said generally annular recirculation passage after the passage of such material through said blast tube, means forming a second transfer passage for the transfer of gaseous material from said annular recirculation passage into said blast tube in general proximity to said inlet end thereof, a deflector cap mounted on said burner jacket generally at said downstream end thereof to define said primary combustion zone, a centrally apertured and generally circular refractory disc mounted within said burner jacket in general proximity to said discharge end of said blast tube for impingement by gaseous material discharging therefrom, said refractory disc being of smaller diameter than said burner jacket so as to define therewith an annular gap constituting said first transfer passage and said refractory disc together with said deflector cap generally defining said primary combustion zone.

Claim 22

An oil burner apparatus which comprises a burner jacket having a sidewall extending from an upstream end to a downstream end of said jacket, an upstream end wall spanning said upstream end of said burner jacket, a blast tube having an inlet end and a discharge end and mounted within said burner jacket to define with said sidewall thereof an elongated and generally annular recirculation passage, said discharge end of said blast tube being disposed upstream of said downstream end of said burner jacket and opening generally into a primary combustion zone, a combustible mixture supply means disposed for the supply of a combustible fuel/air mixture generally axially into said inlet end of said blast tube through an opening in said upstream end wall of said burner jacket, means forming a first transfer passage for the transfer of gaseous material into said generally annular recirculation passage after the passage of such material through said blast tube, means forming a second transfer passage for the transfer of gaseous material from said annular recirculation passage into said blast tube in general proximity to said inlet end thereof, a deflector cap mounted on said burner jacket generally at said downstream end thereof to define said primary combustion zone, a centrally apertured and generally circular refractory disc mounted within said burner jacket in general proximity to said discharge end of said blast tube for impingement by gaseous material discharging therefrom, said refractory disc being of smaller diameter than said burner jacket so as to define therewith an annular gap constituting said first transfer passage and said refractory disc together with said deflector cap generally defining said primary combustion zone.

Claim 23

An oil burner apparatus as defined in claim 20 in which said inlet end of said blast tube is axially spaced apart from said upstream end wall of said burner jacket thereby to provide an annular passage constituting said second transfer passage.

Claim 24

An oil burner apparatus as defined in claim 21 in which said blast tube and said sidewall of said burner jacket are generally cylindrical, said blast tube being generally concentrically mounted so as to define with said burner jacket said recirculation passage.