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  Burner for fabricating optical fiber preformUSPTO Application #: 20060177788Title: Burner for fabricating optical fiber preform Abstract: A burner used for fabricating an optical fiber perform is disclosed. The burner includes a burner housing, a first body formed with a plurality of spraying ports, and a second body aligned in a length direction of the first body. At least a part of the first body is accommodated in the burner housing. At least a part of the second body is accommodated in the burner housing. An oxidizing agent is fed into the second body along an outer peripheral surface of the second body and a fuel is fed into the second body along an inner peripheral surface of the first body. The oxidizing agent is uniformly mixed with the fuel in the first body and a mixture thereof is exhausted to an exterior through the spraying ports. The fuel and the oxidizing agent are separately fed into the burner and mixed with each other in the burner, thereby preventing the backfire phenomenon. Since the mixture of the fuel and the oxidizing agent is sprayed to the exterior after the fuel has been sufficiently mixed with the oxidizing agent in the burner, it is possible to obtain the perfect combustion for the mixing gas. (end of abstract) Agent: Cha & Reiter, LLC - Paramus, NJ, US Inventors: Gu-Young Kang, Yeong-Seop Lee USPTO Applicaton #: 20060177788 - Class: 431354000 (USPTO) Related Patent Categories: Combustion, Mixer And Flame Holder The Patent Description & Claims data below is from USPTO Patent Application 20060177788. Brief Patent Description - Full Patent Description - Patent Application Claims
CLAIM OF PRIORITY [0001] This application claims priority to an application entitled "Burner For Fabricating Optical Fiber Preform," filed with the Korean Intellectual Property Office on Feb. 4, 2005 and assigned Serial No. 2005-10564, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an optical fiber. More particularly, the present invention relates to an apparatus for fabricating silica glass such as an optical fiber preform. [0004] 2. Description of the Related Art [0005] In general, an optical fiber preform is fabricated using a vapor-phase deposition method or a sol-gel method. According to the sol-gel method, a liquid-phase raw material is input into a mold. The mold is heated so that the liquid-phase raw material is changed into a gel-phase material. The gel-phase material is then sintered forming fabricating silica glass. The sol-gel method is performed under a low temperature atmosphere, which reduces the manufacturing cost of the silica glass. In addition, this also enables the composition of the silica glass to be easily adjusted. [0006] The vapor-phase deposition method includes a modified chemical vapor deposition (MCVD) method, a vapor-phase axial deposition (VAD) method and an outside vapor deposition (OVD) method. According to the vapor-phase deposition method, a solid optical fiber preform is fabricated through a vapor reaction under a high-temperature atmosphere of about 1800.degree. C. The vapor-phase deposition method requires expensive manufacturing equipment in order to fabricate the optical fiber preform while causing low productivity. However, the vapor-phase deposition method can obtain a high-quality optical fiber preform. When performing the vapor-phase deposition method, a burner is used in order to promote deposition of an evaporated raw material. [0007] As shown in FIGS. 1 and 2, conventional burners 10 and 20 used for fabricating optical fiber preforms include combustion units 11 and 21 formed with a plurality of spraying ports 12 and 22, which are aligned with a predetermined pattern. The conventional burners 10 and 20 also include at least one pair of pipes 13, 15, 23, and 25 connected to the combustion units 11 and 21 in order to feed fuels and oxidizing agents into the combustion units 11 and 21. The pipes 13, 15, 23, and 25 are connected to fuel storage tanks and oxidizing agent storage tanks (not shown) and integrally unified at predetermined positions of the burners 10 and 20. Mixing regions 17 and 27 are formed in the unified portions of the pipes to mix the fuels with the oxidizing agents before they are fed into the combustion units 11 and 21. Since the fuels are uniformly mixed with the oxidizing agents before they are fed into the combustion units 11 and 21, the burners 10 and 20 can obtain perfect combustion at a relatively high-temperature. [0008] However, if the temperature of the mixture exceeds the combustion point or if ignition occurs by an ignition source the conventional burners 10 and 20 may cause explosion or combustion in the mixing regions before the mixture of the fuels and the oxidizing agents are fed into the combustion units. Such a phenomenon is called a "backfire." In order to prevent the backfire, one proposed method is to suppress any temperature increase in the mixing regions and control a cut-off order of the fuels and the oxidizing agents when turning off the burners, but the backfire problem still remains. [0009] FIG. 3 shows another conventional burner 30 for fabricating the optical fiber preform. As shown in FIG. 3, the conventional burner 30 includes a combustion unit 31 formed with a fuel injection port 33 and an oxidizing agent injection port 35. The fuel and the oxidizing agent are injected into the combustion unit 31 through the fuel injection port 33 and an oxidizing agent injection port 35. In this state, the fuel is exhausted through an exhaust port 32 formed at a center of the combustion unit 31 and the oxidizing agent is exhausted around the fuel. The fuel is mixed with the oxidizing agent in a mixing region 37 formed at an end of the combustion unit 31 so that the mixture of the fuel and the oxidizing agent is burned in the mixing region 37. [0010] Such a conventional burner is called a "dispersing burner." According to the dispersing burner, the fuel and the oxidizing agent are separately exhausted from the combustion unit and mixed with each other at an end of the combustion, so explosions only rarely occur. However, since the fuel and the oxidizing agent may be burned even if the fuel is not sufficiently mixed with the oxidizing agent, density of a mixing gas is irregularly formed in flames exhausted from the conventional burner. This causes unstable flames and imperfect combustion. SUMMARY OF THE INVENTION [0011] One aspect of the present invention relates to a burner for fabricating an optical fiber preform, capable of preventing a backfire phenomenon. [0012] Another aspect of the present invention relates to a burner for fabricating an optical fiber preform, capable of obtaining stable flames and a perfect combustion by allowing fuels to be sufficiently mixed with oxidizing agents. [0013] One embodiment of the present invention is directed to a burner used for fabricating an optical fiber perform. The burner includes a burner housing; a first body formed with a plurality of spraying ports, at least a part of the first body being accommodated in the burner housing; and a second body aligned in a length direction of the first body, at least a part of the second body being accommodated in the burner housing, an oxidizing agent being fed into the second body along an outer peripheral surface of the second body and a fuel being fed into the second body along an inner peripheral surface of the first body. The oxidizing agent is uniformly mixed with the fuel in the first body and a mixture thereof is exhausted to an exterior through the spraying ports. BRIEF DESCRIPTION OF THE DRAWINGS [0014] The above and other aspects, features and embodiments of the present invention will be more apparent from the following detailed description taken in conjunction with the accompanying drawings, in which: [0015] FIG. 1 is a side sectional view illustrating a conventional burner for fabricating an optical fiber preform; [0016] FIG. 2 is a side sectional view illustrating another conventional burner for fabricating an optical fiber preform; [0017] FIG. 3 is a side sectional view illustrating still another conventional burner for fabricating an optical fiber preform; [0018] FIG. 4 is a side sectional view illustrating a burner for fabricating an optical fiber preform according to a first embodiment of the present invention; [0019] FIG. 5 is a plan view of a burner shown in FIG. 4; [0020] FIG. 6 is a side sectional view illustrating a burner for fabricating an optical fiber preform according to a second embodiment of the present invention; and Continue reading... Full patent description for Burner for fabricating optical fiber preform Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Burner for fabricating optical fiber preform 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 for fabricating optical fiber preform or other areas of interest. ### Previous Patent Application: Quartz glass single hole nozzle for feeding fluid and quartz glass multihole burner head for feeding fluid Next Patent Application: Orthodontic system Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Burner for fabricating optical fiber preform patent info. 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