A fuel-fired, forced draft water heater is provided with a specially designed burner structure and combustion product flow path that permit the heater to operate with improved fuel efficiency, lowered CO and NOx emissions, and an improved water heat input distribution along the vertical length of th
A fuel-fired, forced draft water heater is provided with a specially designed burner structure and combustion product flow path that permit the heater to operate with improved fuel efficiency, lowered CO and NOx emissions, and an improved water heat input distribution along the vertical length of the heater. The water heater includes a vertically oriented tank with a vent plenum structure formed at the top end of the tank interior and having an outlet passage connectable to an external combustion product vent pipe. A submerged vertical burner tube extends downwardly from the vent plenum and has an open lower end extending into a submerged turn bowl disposed at the bottom end of the tank interior. Extending upwardly from the turn bowl within the tank interior are a plurality of vertical flue tubes that communicate the interiors of the turn bowl and the vent plenum. A vertically elongated perforated conical burner is disposed within the burner tube and is supplied with a throughflow of a pressurized fuel/air mixture that is ignited by an igniter mounted on the top end of the burner. During operation of the water heater, hot combustion products discharged from the conical burner are sequentially flowed downwardly through the burner tube into the submerged turn bowl, upwardly through the flue pipes into the vent plenum, and then outwardly through the vent plenum outlet passage.
대표청구항▼
A forced draft, fuel-fired water heater comprising: vertical tank having an internal chamber adapted to hold a quantity of water, said tank having a top end, a bottom end, an inlet for receiving pressurized water to be heated within said internal chamber, and an outlet for discharging pressurized he
A forced draft, fuel-fired water heater comprising: vertical tank having an internal chamber adapted to hold a quantity of water, said tank having a top end, a bottom end, an inlet for receiving pressurized water to be heated within said internal chamber, and an outlet for discharging pressurized heated water from said internal chamber; a vent plenum structure formed within a top end portion of said tank, downwardly adjacent the underside of said top end thereof, and defining a top end boundary of said internal chamber, said vent plenum structure having an outlet passage extending outwardly through said tank and connectable to an external combustion product vent pipe; an enclosed, hollow turn bowl structure disposed within a lower end portion of said internal chamber and having a top side wall; a vertically oriented burner tube extending through said internal chamber, said burner tube having a closed upper end positioned adjacent said top end of said tank, and an open lower end portion extending downwardly through said top side wall of said turn bowl structure and opening into the interior of said turn bowl structure; a spaced plurality of vertically oriented flue tubes extending through said internal chamber, said flue tubes having open upper end portions extending through the underside of said vent plenum structure and opening into the interior of said vent plenum structure, and open lower end portions extending through said top side wall of said turn bowl structure and opening into the interior of said turn bowl structure, each of said flue tubes, said burner tube and said turn bowl structure, during operation of said water heater, being submerged in and in intimate heat transfer contact with water within said internal chamber of said tank; a vertically elongated hollow burner structure supported within and extending along a major upper longitudinal portion of said burner tube, said hollow burner structure having a perforated vertical side wall portion spaced horizontally inwardly from the interior surface periphery of said burner tube; fuel/air delivery means for receiving fuel and air from sources thereof, creating a pressurized fuel/air mixture, and forcing the fuel/air mixture downwardly through the interior of said burner structure and outwardly through the side wall perforations thereof; and igniter means, associated with said burner structure, for igniting the pressurized fuel/air mixture exiting said burner structure to thereby create a pressurized flow of hot combustion products that sequentially flow downwardly through said burner tube into said turn bowl structure, upwardly through said flue tubes into said vent plenum structure, and then outwardly through said outlet passage of said vent plenum structure.
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Hughes Dennis R. ; Kramer David W. ; Ruark Darryl L. ; Potter Gary J. ; McCathern Martin P. ; Phillip Peter J., Combustion burner for a water heater.
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