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  Advanced commercial range burnerUSPTO Application #: 20060154193Title: Advanced commercial range burner Abstract: A gas-fired burner including a cylindrical burner housing having a premixed fuel/air opening. Disposed within the cylindrical burner housing is a cylindrical burner ring which forms at least one row of a plurality of burner ports. The cylindrical burner ring is sized relative to the burner housing such that an annular space is formed between the burner housing and the burner ring. Upper and lower annular rings extend between the burner ring and the burner housing, thereby enclosing the annular space. Disposed within the burner ring is a secondary air flow restrictor for controlling the flow of secondary air to the flame. A multi-finger grate having alternating long and short fingers is disposed above the burner housing. (end of abstract) Agent: Mark E. Fejer Gas Technology Institute - Des Plaines, IL, US Inventors: John A. Bowman, Steven Casey USPTO Applicaton #: 20060154193 - Class: 431354000 (USPTO) Related Patent Categories: Combustion, Mixer And Flame Holder The Patent Description & Claims data below is from USPTO Patent Application 20060154193. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to a burner system for range top applications. More particularly, this invention relates to partially premixed, gas-fired burners for use in atmospheric range tops. Range tops to which this invention is particularly applicable are commercial range tops. [0003] 2. Description of Related Art [0004] Conventional gas-fired burners for commercial range tops are atmospheric, partially premixed burner systems having overall thermal efficiencies in the low to mid 40's percent range. In conventional gas-fired burner systems, the flame is produced by a circular burner ring which produces flames which are generally in contact only with the perimeter bottom of a pot or pan (cooking surface). [0005] Most efforts to improve the thermal efficiency have focused on powered burner systems for fully premixed operation of burners with shorter flame length characteristics that allow the burner to be located closer to the cooking surface, thereby increasing thermal efficiency. One effort to improve thermal efficiency is an internal multiple flame port burner developed jointly by a number of Japanese gas companies. This burner is said to improve heating efficiency by 10-25%. The main feature of this burner is a relatively long flame which extends from the center of the burner ring. As a result, during cooking, the flame contacts the center of the cooking surface and spreads outwardly therefrom. [0006] Notwithstanding improvements made to date, room for improvements still remains. SUMMARY OF THE INVENTION [0007] Accordingly, it is one object of this invention to provide a gas-fired burner system for range top applications which provides higher thermal efficiencies than conventional burner systems, typically in the range of about 46-50%. [0008] It is another object of this invention to provide a gas-fired burner system for range top applications having significantly faster times-to-boil than conventional burner systems. [0009] It is yet a further object of this invention to provide a gas-fired burner system for range top applications that is capable of operating at higher firing rates than conventional burner systems without increasing the space occupied by conventional burner systems (i.e. footprint). [0010] These and other objects of this invention are addressed by a gas-fired burner comprising a cylindrical burner housing having a premixed fuel/air opening. Disposed within the cylindrical burner housing is a cylindrical burner ring having a top end and a bottom end, which cylindrical burner ring forms at least one row of a plurality of burner ring ports. The cylindrical burner ring is sized relative to the burner housing such that an annular space is formed between the burner housing and the burner ring. Upper and lower annular rings extend between the burner ring and the burner housing, thereby enclosing the annular space. Disposed within the interior space enclosed by the burner ring at a distance from the top end of the burner ring is a secondary air flow restriction means for controlling the flow of secondary air to the flame. A multi-finger grate having alternating long and short fingers extending above the interior space enclosed by the burner ring is disposed above the burner housing. In addition to providing support for the cooking surface, the multi-finger grate is also a significant factor in the operation of the burner. The burner in accordance with this invention provides as much as a 33% faster time-to-boil than conventional burner systems, thermal efficiencies in the range of about 46-50% and higher firing rates within the same burner footprint--30,000 Btu/hour versus 26,000 Btu/hour. BRIEF DESCRIPTION OF THE DRAWINGS [0011] These and other objects and features of this invention will be better understood from the following detailed description taken in conjunction with the drawings wherein: [0012] FIG. 1 is a perspective view of a burner in accordance with one embodiment of this invention; [0013] FIG. 2 is a cross-sectional view of the burner of FIG. 1 taken along the line II-II; [0014] FIG. 3 is a perspective view of the burner in FIG. 1 showing secondary air flow restriction means in accordance with one embodiment of this invention; [0015] FIG. 4 is a perspective view of a cylindrical burner ring for a burner in accordance with one embodiment of this invention; [0016] FIG. 5 is a perspective view of a cylindrical burner ring for a burner in accordance with another embodiment of this invention; and [0017] FIG. 6 is a diagram showing the 3-2-1 pattern of ports formed by the cylindrical burner ring in accordance with one embodiment of this invention. DETAILED DESCRIPTION OF THE PRESENTLY PREFERRED EMBODIMENTS [0018] The burner system of this invention for range top applications, typically commercial range top applications, comprises four basic components--a cylindrical burner ring with inwardly firing burner ports, secondary air flow control surfaces, a burner housing to hold and enclose the outer surface of the burner ring and to distribute a mixture of fuel and air around the burner ring, and a range top grate. These four components function together to provide the improvements previously described compared to conventional range top burners while complying with ANSI emission and efficiency standards. These improvements result from two primary aspects of the burner system--1) the burner ring and secondary air flow control surfaces, which produce a larger and more uniform heat flux area on the bottom surface of a cooking vessel, particularly large pots, that yields significantly faster time-to-boil and higher thermal efficiency than conventional systems; and 2) the shape and arrangement of the burner ports in the burner ring, the shape and spacing of the secondary air flow control surface(s), and the spacing of the grate assembly, which permit higher firing rates through flame paths that are sufficiently long enough yet limited in the extent to which the flame impinges upon comparatively cold surfaces to fully react the fuel and air and to minimize carbon monoxide emissions. [0019] A gas-fired burner system for range top applications in accordance with one embodiment of this invention is shown in FIGS. 1 and 2. Burner system 10 comprises a cylindrical wall 111 defining a burner housing, which burner housing forms a premixed fuel/air opening 12 for introducing a mixture of fuel and air into the housing. Cylindrical burner ring 13 having a top end 14 and a bottom end 15, as shown in FIGS. 4 and 5, is disposed within the burner housing, forming annular space 16 between cylindrical burner ring 13 and cylindrical wall 11, as shown most clearly in FIG. 2. Extending between top end 14 of cylindrical burner ring 13 and cylindrical wall 11 is a substantially planar upper annular ring 19 and extending between bottom end 15 of cylindrical burner ring 13 and cylindrical wall 11 is a substantially planar lower annular ring 17, whereby annular space 16 is fully enclosed. [0020] Cylindrical burner ring 13 forms at least one row of burner ports 18. In accordance with one particularly preferred embodiment of this invention, burner ports 18 are in the form of vertically elongated slots. In the burner ring configuration shown in FIG. 4, in accordance with one embodiment of this invention, vertically elongated burner ports or slots 18 extend all the way through the top end of burner ring 13. By way of example, burner ring 13 measures approximately 6'' in outer diameter and 1/8'' in thickness. The burner ports are approximately 0.063'' wide by about 1'' long. Continue reading... Full patent description for Advanced commercial range burner Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Advanced commercial range burner 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. 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