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  Sealed combustion gas-fired infrared heaterUSPTO Application #: 20060183066Title: Sealed combustion gas-fired infrared heater Abstract: A gas fired infrared heater is provided that includes a burner, a combustion chamber, a cooling air passage for supplying cooling air to the combustion chamber, a combustion air passage for supplying combustion air to the burner; and an outlet passage allowing combustion product gases to exit the combustion chamber. The cooling air passage is separate from the combustion air passage. The cooling air passage and the combustion air passage both draw from the same pressure zone into which combustion products exit. (end of abstract) Agent: Westerman, Hattori, Daniels & Adrian, LLP - Washington, DC, US Inventor: John E. Eichenlaub USPTO Applicaton #: 20060183066 - Class: 431326000 (USPTO) Related Patent Categories: Combustion, Porous, Capillary, Particulate Or Sievelike Flame Holder, E.g., Radiant Surface Burner, Etc. The Patent Description & Claims data below is from USPTO Patent Application 20060183066. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates to a gas-fired infrared heating apparatus; particularly a heating apparatus that completely segregates an incoming combustion air flow from an incoming radiation-transmissive panel cooling air flow, both of which draw from the pressure zone to which combustion products exit, and that segregates both from the combustion chamber itself. BACKGROUND OF THE INVENTION [0002] A heating device having a fuel-fired radiant burner has long been used for heating various enclosures. The heating device here described includes a thin, radiation-transmissive panel that transmits infrared radiation into the space to be heated (e.g., room, tent) and also seals a combustion chamber which houses a radiant from the space being heated. To maintain the integrity of the heating device, the panel must be cooled. [0003] One way to cool the panel is to have a stream of cooling air flow (e.g., by convection) over the panel. An additional way to cool the panel is to provide a coolant outside the combustion chamber. Another way to cool the panel is to use suction generated when combustion air is entrained by gas jets in infrared-generating burners. However, one problem with this approach is that turbulence in the flame area creates enough admixture of combustion products with incoming combustion air to interfere with clean combustion (e.g., these units produced too much carbon monoxide from recirculation.) Another problem with this approach is that back drafts can cause impaired combustion, carbon monoxide formation, or snuffing of the flame. [0004] Accordingly, there is a need for a heating device that satisfies the following conditions, specifically an apparatus that seals off a combustion chamber from the space to be heated and prevents air in the combustion chamber from being used for combustion. SUMMARY OF THE INVENTION [0005] It is an object of the present invention to provide a heating apparatus that seals off a combustion chamber from a heated space and supplies all combustion air to the burner with no possibility of admixture with combustion chamber gases. [0006] One aspect of the present invention includes a burner, a combustion chamber, a cooling air passage for supplying cooling air to the combustion chamber, a combustion air passage for supplying combustion air to the burner, and an outlet passage allowing combustion product gases to exit the combustion chamber. In this apparatus, the cooling air is separate from the entering combustion air. [0007] Thus, according to the present invention, it is possible for the heating apparatus to draw cooling air in without using gas-jet entrainment of the burner by, in part, entraining considerable air as hot products move upward through the outlet passage. BRIEF DESCRIPTION OF THE DRAWINGS [0008] A preferred embodiment of the present invention will be described with reference to the accompanying drawings, wherein: [0009] FIG. 1 is a cross-sectional view of a heater of the invention; [0010] FIG. 2 is a cross-sectional view of a second embodiment of the invention; [0011] FIG. 3 is a cross-sectional view of a third embodiment of the invention; [0012] FIG. 4 is a cross-sectional view of a forth embodiment of the invention; [0013] FIG. 5 is a cross-sectional view of a fifth embodiment of the invention; [0014] FIG. 6 is a cross-sectional view of a sixth embodiment of the invention; [0015] FIG. 6b is a planar view of the sixth embodiment of the invention; and [0016] FIG. 7 is a cross-sectional view of a seventh embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION [0017] Embodiments of the present invention will be described hereinafter with reference to the accompanying drawings. [0018] Referring to FIG. 1, the heater of the invention is designated by a reference numeral 2, and as shown in an exemplary position as being secured to a ceiling 4 of an enclosure to be heated (e.g., tent, bathroom, ice-fishing shanty, mobile home, etc.) A combustion chamber 6 is provided with generally upright side walls 8, 10, a front and rear wall (not shown) and a bottom wall 12, with a radiation-transmissive port therein. The port may extend between the side walls 8, 10 and the front and rear walls of the combustion chamber 6, although it may be desirable, in some instances, to have a smaller port. A sealing barrier 14 is located to close the port, and may be fastened by clamps, spline in groove, or the like (not shown) to the periphery of the front, rear, and side walls of the combustion chamber 6. [0019] The sealing barrier 14 is desirably of a thin, flexible plastic material which ordinarily softens or melts below 1000.degree. F. Preferred materials for the panel include such thermoplastics as polytetrafluoroethylene (Teflon "TFE", a trademarked product of E. I. DuPont DeNemours and Company, Inc.) which has an infrared transmissivity of approximately 0.88, poly (tetrafluoroethylene-hexafluoropropylene) (Teflon "FEP", manufactured by the DuPont Company) which has an infrared transmissivity of 0.97, and polyester materials such as poly (ethyleneterephthalate) a product sold under the name Mylar by the DuPont Company and which has an infrared transmissivity of approximately 0.77. Teflon FEP film having a thickness of approximately 0.002 inches is preferred, since this material is flexible, is highly transmissive of infrared radiation, and is more resistant to high temperatures than many other polymeric materials. Continue reading... Full patent description for Sealed combustion gas-fired infrared heater Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Sealed combustion gas-fired infrared heater patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Sealed combustion gas-fired infrared heater or other areas of interest. ### Previous Patent Application: Oil lamp and methods of using the same Next Patent Application: Gas combustion device Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Sealed combustion gas-fired infrared heater patent info. 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