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  Burner with diffuser resistant to high operating temperaturesUSPTO Application #: 20060154191Title: Burner with diffuser resistant to high operating temperatures Abstract: A burner suppliable with a mixture of air and fuel, comprising a burner body provided with a diffuser in which openings are made for the passage and subsequent combustion of said mixture, said diffuser is divided into a plurality of diffuser elements that are adjacent to one another, each diffuser element being at least partially free to dilate in at least one direction. (end of abstract) Agent: Nixon & Vanderhye, PC - Arlington, VA, US Inventors: Massimo Gilioli, Giuseppe Fogliani, Stephanus Wijkmans, Massimo Dotti, Renzo Vecchi, Gunther Berthold, Wenzel Mach USPTO Applicaton #: 20060154191 - Class: 431129000 (USPTO) Related Patent Categories: Combustion, Burner Head Cover Operatively Interrelated With Igniter The Patent Description & Claims data below is from USPTO Patent Application 20060154191. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] The present invention relates to a burner, in particular to a premixed burner with a diffuser resistant to high temperatures. [0002] In burners subject to high operating temperatures, such as for example premixed burners, the high thermal stress may easily cause very great mechanical deformations and stress to the burner diffuser, which may lead to the breaking of the diffuser. This drawback occurs with any form of burner diffuser, but has been found to be particularly serious in burners with flat diffusers. To overcome this drawback, it has been proposed to use special materials to make the burner diffuser, for example a metal mesh, or a ceramic material. However, this leads to a significant increase in the cost of the burner if the metal mesh is used and significant fragility of the diffuser if a ceramic material is used. [0003] One object of the present invention is to provide a burner suitable for operating at high operating temperatures that is highly resistant to thermal stress without special materials being required to make the diffuser, which is simple and relatively cheap to build. [0004] According to the invention, a burner is provided that is suppliable with a mixture of air and fuel, comprising a burner body provided with a diffuser in which openings are made for the passage and subsequent combustion of the mixture, characterised in that the diffuser is divided into a plurality of diffuser elements that are adjacent to one another, each element being at least partially free to expand in at least one direction. [0005] The diffuser divided into a plurality of elements adjacent to one another, partially free to expand in at least one direction, has resistance to thermal stress that is significantly greater than is the case with a monobloc diffuser inasmuch as the heat expansions that occurs during burner operation on each diffuser element, induced by said temperature variations, is noticeably reduced, with a consequent noticeable reduction of deformation and of the mechanical stress induced by it. [0006] According to a preferred embodiment of the present invention, each diffuser element has a shape that is such as to give it great mechanical rigidity. [0007] This enables the flexional stability of each diffuser element to be improved, further increasing resistance to thermal stress. [0008] According to a further aspect of the present invention rigidity-varying means is provided that is suitable for diminishing the rigidity of the diffuser element in a direction parallel to its greater dimension. [0009] This enables mechanical stresses due to heat expansion in the direction of the greater dimension to be further diminished. [0010] The invention will now be disclosed by way of non-limiting examples by reference to the attached drawings in which: [0011] FIG. 1 is a perspective view of a burner according to the invention, with a diffuser having the shape of a cylindrical envelope; [0012] FIG. 2 is a view of the partially dismantled burner in FIG. 1; [0013] FIG. 3 is a view of a further burner according to the invention with a double diffuser having the shape of a cylindrical envelope; [0014] FIG. 4 is a perspective view of a first embodiment of a diffuser element according to the invention; [0015] FIG. 5 is a perspective view of a burner with a diffuser having a substantially flat shape; [0016] FIG. 6 is a perspective view of the diffuser elements of the burner in FIG. 5; [0017] FIG. 7 is an enlarged and fragmentary detail of FIG. 6, in which a flow-distributing element is shown that is fitted inside each diffuser element to make uniform the distribution of the flow of mixture to the openings of the diffuser element; [0018] FIG. 8 is a perspective view of the distributing element shown in FIG. 7; [0019] FIG. 9 is a perspective view of a further burner with a diffuser having a substantially flat shape; [0020] FIGS. 10 and 11 are perspective views of a second embodiment of a diffuser element of the burner according to the invention, integrated with a flow-distributing element; [0021] FIG. 12 is a cross section of the diffuser element of FIGS. 10 and 11; [0022] FIGS. 13 and 14 are perspective views of a third and of a fourth embodiment of a diffuser element of the burner according to the invention, integrated with a flow-distributing element; [0023] FIG. 15 is a perspective view of a fifth embodiment of a diffuser element of the burner according to the invention; [0024] FIG. 16 is a cross section of the diffuser element in FIG. 15; Continue reading... Full patent description for Burner with diffuser resistant to high operating temperatures Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Burner with diffuser resistant to high operating temperatures 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 Burner with diffuser resistant to high operating temperatures or other areas of interest. ### Previous Patent Application: Catalytic combustors keeping contained medium warm in response to hydrostatic valve Next Patent Application: Burner with stepped fuel injection Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Burner with diffuser resistant to high operating temperatures patent info. 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