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A fuel-fired, condensing type forced air heating furnace is provided with an improved hot combustion gas-to-air heat exchange system which includes a generally drum-shaped primary heat exchanger having an outlet end connected to a first end of a transfer manifold whose second end is connected the in

A fuel-fired, condensing type forced air heating furnace is provided with an improved hot combustion gas-to-air heat exchange system which includes a generally drum-shaped primary heat exchanger having an outlet end connected to a first end of a transfer manifold whose second end is connected the inlet end of a fin-and-tube type secondary heat exchanger which is spaced laterally apart from, faces, and extends generally parallel to the primary heat exchanger. A radial discharge fuel burner end portion is coaxially positioned within an inlet end of the primary heat exchanger and, during furnace operation, a draft inducer fan draws burner combustion gases sequentially through the primary heat exchanger, the transfer manifold and the secondary heat exchanger while air to be heated is flowed externally over these heat transfer elements. The overall heating efficiency of the furnace is improved, and the fabrication cost of the furnace is reduced, by the use of the radial discharge burner, a perforated baffle wall which improves the air heating capacity of the manifold, and a weldless mechanical crimp roll joint construction used to fabricate and interconnect the primary heat exchanger and transfer manifold.

대표청구항 ▼

A fuel-fired, condensing type forced air heating furnace comprising: a housing having a heating chamber with an air inlet opening and a supply air outlet opening, and a return chamber communicating with said heating chamber through said air inlet opening and having a return air intake opening; a gen

A fuel-fired, condensing type forced air heating furnace comprising: a housing having a heating chamber with an air inlet opening and a supply air outlet opening, and a return chamber communicating with said heating chamber through said air inlet opening and having a return air intake opening; a generally cylindrical primary heat exchanger extending along a central longitudinal axis and disposed within said heating chamber, said primary heat exchanger having a generally circular front inlet end wall and generally circular rear discharge end wall spaced apart from said front inlet end wall along said central longitudinal axis; a transfer manifold disposed within said heating chamber and having a first end portion extending outwardly across and covering said rear discharge end wall of said primary heat exchanger, and a second end portion extending from said primary heat exchanger toward said return chamber in a direction generally transverse to said central longitudinal axis; a condensing heat exchanger disposed within said heating chamber and positioned between said primary heat exchanger and said air inlet opening, said condensing heat exchanger having an inlet end operatively connected to said second end portion of said transfer manifold, and an outlet end, said rear discharge end wall of said primary heat exchanger having diametrically opposite first and second peripheral portions spaced apart in said transverse direction, said second peripheral portion being positioned between said first peripheral portion and said condensing heat exchanger; fuel/air burner means for generating an annular, generally radially directed flame pattern coaxially disposed within an inlet end portion of said primary heat exchanger and for producing hot combustion gases within said inlet end portion of said primary heat exchanger; discharge opening means, formed in only an upper half of said rear discharge end wall of said primary heat exchanger through only said first peripheral portion thereof, for flowing said hot combustion gases from the interior of said primary heat exchanger into said first end portion of said transfer manifold; draft inducer fan means having an inlet operatively connected to said outlet end of said condensing heat exchanger, said draft inducer fan means being operative to draw said hot combustion gases sequentially through said primary heat exchanger discharge opening means, said transfer manifold and said condensing heat exchanger and then discharge the combustion gases; and supply blower means for sequentially flowing air to be heated into said return chamber through said return air intake opening, into said heating chamber through said air inlet opening, through said heating chamber and externally across said condensing heat exchanger, said transfer manifold and said primary heat exchanger, and outwardly through said supply air outlet opening, the positioning of said discharge opening means in only said first peripheral portion of said rear discharge end wall of said primary heat exchanger causing essentially all of the hot combustion gases discharged from said primary heat exchanger to flow in said transverse direction along generally the entire outer side surface area of said rear discharge end wall and through the entire length of said first end portion of said transfer manifold to thereby prevent short circuiting of the discharged combustion gases flowing from said primary heat exchanger to said condensing heat exchanger through said transfer manifold.