Gas-fired heater means

Claim 1

Improved gas-fired space heater means, comprising in combination: (a) a first duct-like member being provided with an interior and an exterior, said member having opposite front and rear ends, said front end being provided with a combustion supporting gas plenum, said plenum having an inlet and an outlet, said outlet being in flow communication with means for receiving, mixing and igniting a mixture of pressurized fuel gas and a combustion supporting gas within said interior, said rear end having an exhaust conduit means in fluid communication with the interior of said first duct and an exhaust outlet located adjacent to said front end, said first duct-like member being provided with first baffle means therein; (b) a second duct-like member, surrounding said first duct-like member and said exhaust conduit means and having opposite forward and rearward ends, with said forward and rearward ends of said second duct-like member being respectively located adjacent to said front and rear ends of said first duct-like member, said second duct-like member being provided with second baffle plates disposed to deflect the flow of a pressurized fluid into contact with all sides of said exterior of said first duct-like member, said second duct-like member including an aperture for receiving said exhaust outlet; (c) said second duct-like member having a fluid inlet opening located proximate to one of said opposite front and rear ends of said first duct-like member and a pressurized fluid outlet opening located between said opposite front and rear ends of said first duct-like member; (d) means for supplying a stream of said pressurized fluid to said inlet opening of said second duct-like member for discharge through said outlet opening of said second duct-like member after having passed over the exterior of and received heat from said first duct-like member and said exhaust conduit means to supply heated fluid to a space via second conduit means connected said outlet opening of said second duct-like member; (e) combustion supporting gas intake means are provided with an inlet adjacent to said fluid outlet opening of said second duct-like member and positioned adjacent said second baffle plates and between said first and second duct-like members, said combustion supporting gas intake means outlet being in fluid communication with said plenum inlet for diverting a portion of said stream of pressurized fluid into said front end of said first duct-like member for mixing and ignition therein with said fuel gas; and (f) temperature-responsive control means for controlling the flow of said combustion supporting gas through said combustion supporting gas intake means in inverse proportion to the temperature of said combustion supporting gas, said temperature-responsive control means including a valve means in said plenum outlet, said valve means being operable in response to a temperature sensing means.