US 12,644,596 B2Granted

Gas furnace with heat exchanger

AssigneeDaikin Comfort Technologies Manufacturing, L.P.

InventorsSien Fong Goh, Jianmin Zhang

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Abstract

A furnace assembly has a fuel gas manifold connectable to a fuel gas supply that has fuel gas nozzles connectable to inshot burners. Each burner fires a flame and includes an air entrance section and a static air mixer including vanes with the mixer configured to fully mix the flow of fuel gas and the flow of ambient air flowing through the mixer into a fully mixed mixture. Each burner also includes a metal fiber mesh burner surface defines a surface where combustion of the fully mixed mixture occurs to create the flame. The furnace assembly also includes a heat exchanger in communication with the inshot burners and comprising tubes and a blower downstream of the heat exchanger and in fluid communication with the tubes and operable to create a negative pressure in the heat exchanger and pull the flows of fuel gas and ambient air into the burners.

Claims20

Dependent claims

A furnace assembly for use with a fuel gas from a fuel gas supply, comprising:

a fuel gas manifold connectable to the fuel gas supply and comprising fuel gas nozzles;
inshot burners, each burner connectable to a fuel gas nozzle and configured to fire a flame and comprising:
a fuel gas nozzle retainer configured to attach to one of the fuel gas nozzles for receiving a flow of fuel gas into the burner;
an air entrance section comprising an opening configured to allow entrance of a flow of ambient air into the burner;
a venturi tube section comprising a converging inlet section and a diverging outlet section that communicates through a restricted throat;
a static air mixer located in the throat and comprising vanes configured to fully mix the flow of fuel gas and the flow of ambient air flowing through the mixer into a fully mixed mixture;
and
a metal fiber mesh burner surface located in the outlet section, wherein the mesh burner surface comprises a concave portion and defines a surface where combustion of the fully mixed mixture occurs to create the flame;
a heat exchanger in communication with the inshot burners and comprising tubes;
and
a blower downstream of the heat exchanger and in fluid communication with the tubes, the blower operable to create a negative pressure in the heat exchanger and pull the flows of fuel gas and ambient air into the burners.

8 more elements

Dependencies are inferred from the claim text.