Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/46—Details, e.g. noise reduction means
  • F23D14/48—Nozzles
  • F23D14/56—Nozzles for spreading the flame over an area, e.g. for desurfacing of solid material, for surface hardening, or for heating workpieces
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/04—Re-forming tubes or rods
  • C03B23/043—Heating devices specially adapted for re-forming tubes or rods in general, e.g. burners
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/04—Re-forming tubes or rods
  • C03B23/045—Tools or apparatus specially adapted for re-forming tubes or rods in general, e.g. glass lathes, chucks
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
  • C03B23/00—Re-forming shaped glass
  • C03B23/04—Re-forming tubes or rods
  • C03B23/09—Reshaping the ends, e.g. as grooves, threads or mouths
  • C03B23/099—Reshaping the ends, e.g. as grooves, threads or mouths by fusing, e.g. flame sealing
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/20—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone
  • F23D14/22—Non-premix gas burners, i.e. in which gaseous fuel is mixed with combustion air on arrival at the combustion zone with separate air and gas feed ducts, e.g. with ducts running parallel or crossing each other
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/38—Torches, e.g. for brazing or heating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K5/00—Feeding or distributing other fuel to combustion apparatus
  • F23K5/002—Gaseous fuel
  • F23K5/005—Gaseous fuel from a central source to a plurality of burners
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2212/00—Burner material specifications
  • F23D2212/20—Burner material specifications metallic
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K2400/00—Pretreatment and supply of gaseous fuel
  • F23K2400/20—Supply line arrangements
  • F23K2400/201—Control devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
  • F23K2900/00—Special features of, or arrangements for fuel supplies
  • F23K2900/05001—Control or safety devices in gaseous or liquid fuel supply lines

Definitions

• the present invention relates generally to opposing flame flameworking benches useful for glass forming, and particularly to opposing flame flameworking benches for laboratory use.
• Flameworking benches find application in laboratory testing and in manufacturing-based testing of glass materials, particularly because standard practices for certain tests or analyses require that the material to be tested be in the form of a fiber or other specific shape within relatively tight dimensional tolerances.
• the test samples are typically prepared by a skilled worker drawing the required fiber shape, or forming any other required test sample shape, using a flameworking bench.
• the starting form of the glass may typically be a rod or tube or other form generated by the glass forming or glass making process under study, or produced from a laboratory melt.
• An opposing flame flameworking bench also known as a cross-burner bench, is often used for flameworking glass materials such as glass rods both for artistic and laboratory purposes.
• the typical opposing flame flameworking bench has two burners connected to and mounted above a typically horizontal bench surface, with the burners facing each other horizontally across a gap. When the burners are in operation, the flames from the burners approach the center of the gap from opposite sides.
• a glass article to be worked is heated and softened by an operator placing the article within the gap, allowing the article to be heated by the flames.
• the presence of two flames coming from opposite directions generally allows for quicker, more uniform and more controlled heating relative to a single flame.
• BGA Blister Gas Analysis
• glasses with annealing points of up to 800 ° C or greater, and with softening points of up to 1050°C or greater would desirably be handled on the same bench as glasses with annealing points as low as 400°C or less, and softening points of 470°C or less.
• the bench be standardized in such a way as to guarantee consistent performance across multiple installations in multiple locations.
• a portable cross-fire burner flameworking device includes a table, two or more gas hookups, two or more regulator and flow meter pairs respectively connected so as to be able to receive gas from the gas hookups, two or more control valves respectively connected so as to be able to receive gas from the regulator and flow meter pairs, and two burners having burner heads each connected so as to be able to receive gas from the two or more control valves mounted on the table.
• Each burner head has a burner face, and the burner faces are oriented towards each other at a distance.
• the two or more gas hookups are connected to the table so as to be portable therewith, the two or more regulator and flow meter pairs are connected to on the table so as to be portable together therewith, the two or more control valves are connected to the table so as to be portable therewith, and the two burner heads are likewise connected to the table so as to be portable together therewith. Further, at least one of the two burner heads is connected to the table via a moveable mount allowing the distance between the burner faces to be adjusted.
• Figure 1 is a diagrammatic plan view, approximately but not precisely to scale, of a presently preferred embodiment of a flameworking bench 10 of the present invention
• Figure 2 is a diagrammatic elevational view of the bench 10 of Figure 1
• Figure 3 is a perspective view of burners 24 and associated structures, showing, for convenience in depiction of details, only a portion of the table 12; and
• Figure 4 shows a closer view of the burner 24 and burner face 58 visible in Figure
• Figure 1 is a diagrammatic plan view, approximately but not precisely to scale, of a presently preferred embodiment of a flameworking device commonly referred to as a "bench" 10 of the present invention.
• Figure 2 is a diagrammatic elevational view of the bench 10 of Figure 1.
• Figure 3 is a perspective view of burners 24 and associated structures, showing, for convenience in depiction of details, only a portion of the table 12.
• Figure 4 shows a closer view of the burner 24 and burner face 58 visible in Figure 3.
• the bench 10 includes a table 12 preferably comprised of stainless steel or other high-temperature-resistant material with relatively low specific heat. This provides a durable surface that is quickly cooled after use.
• each regulator and instrument array includes, in order along the gas flow path, an adjustable regulator 48, a pressure indicator such as a pressure gauge 50, and a flow meter such as an in-line tubular flow meter 52.
• needle valves 22 at an edge (the front) of the table 12 control the flow and on/off status of the gases.
• Gas hoses 21 carrying the gases from the fittings 16 through the regulator and instrument arrays 20 to the needle valves 22 and then to the burner heads 24 are preferably enclosed and/ or sealed within the table 12 or at least integrated with it in such fashion as to constitute a single integrated product with limited user-serviceable parts. This helps ensure that each table performs identically or nearly identically over its useful life before replacement or refurbishing.
• the resulting flame bench 10 is portable, allowing for easy installation and set-up by simply attaching the table to an adequate support (which may also be a portable device), and connecting gas supplies to the fittings 16.
• the burner heads 24 face each other across a distance or gap 26.
• Each burner head 24 is supported on a pair of pipes 40, 42 (only one pipe of one pair is visible in Figure 2), which pipes 40, 42 also carry the fuel gas and, separately, the combined oxygen and air to the burner head 24.
• the pipes 40, 42 are in turn supported in a base 44 mounted on the table 12.
• At least one of the bases 44 is preferably mounted in a adjustable manner via a moveable mount, such as in a groove 28 with a screw 54 for fixing the base 44 at any desired point along the groove 28. This provides the capability to adjust the dimension of the gap 26.
• a tipping torch 32 a fuel and oxygen torch for forming ends or tips on fibers and other test structures formed at the bench, is desirably also mounted on the surface of the table 12, near the front burner 24 as shown in Figure 1.
• the tipping torch 32 may be mounted to the side and in back of the rear burner 24, as shown by the reference character 34, or both mounting positions may be provided on the table 12, with the position of the torch selectable by the user.
• the tipping torch 32 includes a pre-mixed flame tip 46 and a coupled base 48, the coupled base allowing replacement of the torch 32.
• Needle valves 30 at the front of the bench control gas flow to the tipping torch 32. Needle valves 30 and needle valves 22 are preferably protected by guards not shown in Figure 1, guard 31 and guard 23 respectively as shown in Figure 2, so that the valves are not accidentally turned.
• a preferably circular hole or depression 35 is desirably provided in the surface of the table 12.
• the hole 35 is preferably filled with a wooden cylinder or disk 36 having at least one hole 38 formed therein. Rods from which glass structures are being drawn or otherwise worked or formed may be held by placing them in the hole 38.
• the burner face 58 is that of a surface mixing burner including, in this example, nine (9) gas ports or nozzles 60.
• Each gas port 60 includes a central fuel gas pipe 62 through which fuel gas is to be conducted out of central passage 64.
• Surrounding the fuel gas pipe 62 is a concentric ring gas passage 66 formed between the face 58 of the burner 24 and the fuel gas pipe 62. The oxygen and air mixture determined by the regulator and needle valve settings is conducted out of the concentric ring gas passage 66.
• each burner head 24 is preferably formed of stainless steel or other high-temperature-resistant material with relatively low specific heat.
• the opposing flame (cross-burner) bench 10 of the present invention has several advantages.
• the use of surface mixing burners 24 eliminates the possibility of flash back, allowing for safer use of higher temperatures.
• the surface mix burners 24 also allow saving room and cost by eliminating the use of mixing chambers and valves.
• the surface mixture burners also provide another added feature increased distance without increased flame. Since mixing takes place beginning at and continuing even somewhat away from the burner face 58, and not in up-line from the burner face in a mixture chamber, the hottest part of the flame extends further from the burner face 58 with a surface mixing burner than with a pre-mix burner. As a result, the distance 26 between the burner faces 58 can be increased relative to premix burners, while still achieving the correct temperature range for glass sample preparation. This increased distance 26 gives the operator a larger working area. This increased distance can reduce instances of the operator accidentally bumping a work piece with molten glass against the surface 58 of the front burner 24. Such bumping can cause clogging of the burner and the hazards of uneven or unequal flame pressures.
• the adjustable distance 26 gives flexibility to the user to increase the materials range of the bench.
• the currently preferred adjustable distance 26 or range of adjustment is about 5 centimeters.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Manufacturing & Machinery (AREA)
• Gas Burners (AREA)
• Regulation And Control Of Combustion (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=39745507

Family Applications (1)

Country Status (4)

Family Cites Families (22)

• 2008
  • 2008-05-30 US US12/600,715 patent/US20100291496A1/en not_active Abandoned
  • 2008-05-30 JP JP2010510359A patent/JP2010529397A/ja not_active Ceased
  • 2008-05-30 WO PCT/US2008/006881 patent/WO2008150465A2/en active Application Filing
  • 2008-05-30 EP EP08767985A patent/EP2153129A2/de not_active Withdrawn

Non-Patent Citations (1)

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