JP2009156518A - Fusing nozzle for metallic body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fusing nozzle capable of easily obtaining standard flame to prevent attachment of fusing scrap and slag by suppressing increase of a burner diameter of a nozzle tip, and improving fusing accuracy by throttling the standard flame to high-speed strong frame and increasing a fusing speed. <P>SOLUTION: In this fusing nozzle for the metallic body applying a nozzle shaft center portion as a fuel flow channel, and provided with a primary-side supporting gas flow channel or a secondary-side supporting gas flow channel at its circumference, the primary-side or secondary-side supporting gas flow channel is provided with a fixed spiral throttle slit flow channel and a rotating spiral slit flow channel disposed at the downstream side of the fixed spiral throttle slit flow channel and having the spiral direction opposite to the spiral throttle slit flow channel, a plurality of permanent magnets are arranged at the circumference of a fuel flow channel in a state that S-poles and N-poles are positioned along the nozzle axial direction, and a conical cylindrical ejector discharging and forming the outside air thin film flow at the circumference of the flame from the nozzle tip portion, is connected with the nozzle tip portion. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention gives a self-swirl flow with a conventional gas pressure such as oxygen, ejects a combustion oxidizing gas swirling at a high speed from a nozzle crater, and has a conventional metal body fusing contrast of 20 by the pinch effect and the Coanda effect. The present invention relates to a fusing nozzle for metal bodies that can reduce the cost by at least%.

Fusing of a metal body is one in which a metal is oxidized by a combustion flame of oxygen and fuel gas from a fusing nozzle and melted and cut. In general, depending on the type of metal to be cut and the fusing thickness Select the fusing nozzle, allocate the auxiliary gas such as fuel gas and oxygen, and adjust the injection pressure appropriately to set the required flame power and fusing pressure of the combustion flame (heating flame) to obtain the standard flame It is not necessary, and many years of experience and know-how are required.
In addition, it is important to make the heating flame a standard flame by adjusting the flame power and oxygen pressure in order to prevent sticking during fusing, which greatly affects the fusing work efficiency and the finish of the fusing surface. In a flame in which the oxygen pressure is excessively increased, the melting cross section becomes uneven, and the heated fusing part is cooled, thereby prolonging the fusing time.
If the flame is too large, the melted opening of the metal body is stepped down and the oxide adheres to the lower surface in large quantities. On the other hand, if the temperature is too small, the temperature will not rise sufficiently and the fusing time will be increased, resulting in a jagged melting section due to incomplete flame passage to the lower surface.

For this reason, inexperienced people are expensive, but oxygen is increased to make it an over-oxidized flame rather than a standard flame, and there is no excess or deficiency with respect to fuel gas such as acetylene gas, propane gas, etc. However, there is an urgent need to improve the fuel gas consumption, the dust ash and the amount of smoke, increase the heat load on the worker, and cause damage due to air pollution.
An experienced expert judges that a standard flame is light reddish purple at the center of the flame, and this part is 3000-3500 ° C. The over-oxidized flame has a purple color as a whole, and the acetylene gas-excess flame is indistinguishable from the light red color. Therefore, in general, when a standard flame is used, the oxygen pressure in the heating crater decreases when the oxygen port for fusing is opened. It becomes a gas excess flame and heating temperature falls.
In this way, the fusing with the fusing nozzle looks simple, but the outlet diameter of the fusing nozzle is increased to φ15 to φ20 in order to increase the diameter of the flame, especially when the thickness of the metal body increases. Since the generation amount of the metal oxide is further increased, it is necessary to consider the prevention of such adhesion at the same time, and since it receives the radiant heat of the molten heat insulation, it does not change to receive a heavy work load.

Thus, the structure of the fusing nozzle for the metal body generally has a nozzle shaft core portion as a straight flow fuel flow path, and a straight flow primary side auxiliary gas flow path is disposed in a single layer around the fuel flow path. Alternatively, there is a configuration in which a primary side auxiliary gas flow path and a secondary side auxiliary gas flow path are formed and arranged in a double manner.
For example, a steel material in which the nozzle shaft core portion is a straight flow fuel hydrocarbon gas flow path, and a primary flow auxiliary oxygen gas flow path and a secondary flow oxygen gas flow path are arranged around the straight flow. In the fusing nozzle, the fuel oxygen gas discharged from the nozzle tip and the primary auxiliary oxygen gas are instantaneously mixed and burned at the contact portion, which causes the Coanda effect to flow along the secondary auxiliary oxygen gas flow. It becomes a straight laminar flow, secures a point contact cutting part with a circular cutting area on the steel surface and moves it forward to melt the steel.
However, when the point-contact cutting part moves forward, if the already melted part adheres even at one place during the progress, it becomes the nucleus and attaches the cut fallen object to generate iron oxide of Fe + O2 → Fe2O3. Remelting heat is generated by heat and firmly fixed.
For this reason, the removal of the adhering matter fixed after the melting is accompanied by a complicated operation requiring a great amount of labor, time and cost.
For this reason, the conventional problem is to make the point contact cutting part of the circular cutting area formed by the flame from the fusing nozzle an appropriate small area part and to increase the fusing width in order to increase the temperature and secure the necessary fusing pressure. The purpose was to improve the fusing speed and fusing accuracy by making it narrow and uniform.

In recent information, as introduced in Patent Document 1, a cutting oxygen channel is provided in the shaft core portion of the fusing nozzle, a single fuel gas channel is provided on the outer side, and a Coanda is provided at the tip of the cutting oxygen channel. There is one in which a constricted portion composed of a concave conical surface and a convex conical surface for generating a spiral flow is fixedly formed. This is a type in which the cutting oxygen discharge flow is located at the center of the fuel gas discharge flow from the fusing nozzle and the outer fuel gas is burned. The structural structure is not specified, and the quantitative effect of reducing the fusing width, raising the fusing temperature, and increasing the fusing rate is unknown. Further, it is considered that there is a limit to the reduction of the point contact cutting portion having the circular cutting area.
JP 2000-176737 A

The object of the present invention is to focus on high-speed and powerful flames in an energy-saving manner, to improve the fusing accuracy by speeding up the fusing speed of the metal body, and at the same time, preventing adhesion of fusing debris and noro to the metal body, and safety It provides a fusing nozzle that enables environmentally friendly fusing work.

That is, according to the present invention, the complete combustion of the fuel gas from the fusing nozzle, the long-distance injection of the flame, and the point contact cutting portion of the circular cutting area formed by the flame on the surface of the metal body is made an appropriate small area portion. High temperature of 3300 to 3800 ° C and necessary fusing pressure are ensured, and the fusing speed and fusing are made uniform by making the fusing width uniform from small to very thick, without unduly increasing the nozzle tip diameter. Fusing that is friendly to the global environment and advantageously improves the working environment by improving accuracy and preventing fusing waste and sticking and backfire, etc., so that safe fusing work and generation of greenhouse gases are minimized. A nozzle is provided.

The technical conditions characterized by the present invention are as follows (1) to (7).
(1) In a fusing nozzle for a metal body in which a nozzle shaft core portion is a fuel flow path, and a helping gas flow path is formed around the fuel flow path, a fixed spiral throttle slit flow path is provided in the helping gas flow path. A fusing nozzle for a metal body, characterized in that a rotating spiral slit channel in the direction opposite to the spiral of the spiral throttle slit channel is interposed downstream thereof.
(2) In the fusing nozzle for a metal body in which the nozzle shaft core portion is a fuel flow path, and the primary side auxiliary gas flow path and the secondary side auxiliary gas flow path are formed around the fuel flow path, the secondary side A metal body characterized in that a fixed spiral throttle slit channel and a rotary spiral slit channel in a direction opposite to the spiral throttle slit channel are interposed downstream of the gas channel in the gas channel. Fusing nozzle.
(3) In the fusing nozzle for a metal body in which the nozzle shaft core portion is a fuel flow path and the primary side auxiliary gas flow path and the secondary side auxiliary gas flow path are formed around the fuel flow path, the secondary side A primary spiral gas flow path is interposed in the gas flow path, and a downstream spiral slit flow path in the direction opposite to the spiral throttle slit flow path is interposed downstream of the fixed spiral throttle slit flow path. A fusing nozzle for a metal body, characterized in that a straight flow slit channel or a spiral slit channel that rotates together with the rotary spiral slit channel is interposed in a path.
(4) characterized in that a plurality of permanent magnets are arranged around the fuel flow path along the nozzle axis direction with a plurality of permanent magnets, and the opposing poles between the permanent magnets are the same. The fusing nozzle for a metal body according to any one of (1) to (3).
(5) At the outer periphery of the front part of the outer tube of the fusing nozzle, suck the ambient air from the rear inflow port, and place the throttle port at the front part with a narrow annular gap from the front end of the fusing nozzle outer tube, The metal body according to any one of (1) to (4), wherein a conical cylindrical ejector that discharges and forms an outer air film flow around the flame from the tip of the fusing nozzle is screwed and connected. Fusing nozzle.
(6), for the metal body according to any one of (1) to (2), characterized in that the rotary spiral slit flow path is formed by a single spiral swirl flow forming ring provided rotatably. Fusing nozzle.
(7), characterized in that the rotary spiral slit channel and the straight flow slit channel or the spiral slit channel are formed by a double spiral swirl flow forming ring provided rotatably (3) The fusing nozzle for a metal body according to any one of (5).

The fusing nozzle according to the present invention has the above-described configuration, and appropriately includes the complete combustion of the fuel gas from the fusing nozzle, the long-distance injection of the flame, and the point contact cutting portion of the circular cutting area formed by the flame on the surface of the metal body. With a small area, a high temperature of 3300 to 3800 ° C and the necessary fusing pressure are ensured, and the fusing width is made uniform and small from small to very thick, without unduly increasing the nozzle tip diameter. The fusing speed and fusing accuracy are improved, and at the same time, fusing debris and adhesion are prevented, backfire due to radiant heat is prevented, and the fusing work environment can be advantageously improved. Furthermore, although the fusing nozzle of the present invention is slightly expensive, the above effect can be enjoyed by using only the conventional metal fusing device and replacing only the nozzle body. Above all, the production cost of the nozzle can be recovered in a short time due to the effect of saving fuel gas and oxygen gas.

The function and effect of the characteristic structure of the fusing nozzle for a metal body of the present invention will be described in detail below.
In the fusing nozzle of the present invention, a spiral slit flow path of a rotatable spiral swirl flow forming ring is desired in the primary side auxiliary gas path or the secondary side auxiliary gas path, and a spiral in the reverse direction is provided upstream thereof. By making the helical throttle slit flow path of a fixed spiral throttle ring formed with a throttle slit, the auxiliary gas flow is once squeezed by the spiral throttle slit ring to increase the pressure, and the discharge pressure flow is changed to the spiral of the spiral swirl flow forming ring. The spiral swirl flow forming ring is caused to collide and flow into the slit flow path, and the spiral swirl flow forming ring is reliably rotated at high speed by this strong reaction, and this rotation causes the high-speed spiral swirl flow to flow through the spiral slit flow path. It is applied and ejected at high speed from the nozzle crater.
The auxiliary gas flow (primary side auxiliary gas flow or secondary side auxiliary gas flow) ejected from the crater crater is ejected from the center of the nozzle crater as a fuel flux, liquid fuel flux or fuel. The coanda effect and the pinch effect flow at high speed directly (single) around the mixed flux of gas and gasification flux or through the inner side auxiliary gas flow to the gas fuel or liquid fuel flux (double) It creates a phenomenon that reduces the flame to about 20%, and the Joule heat naturally improves and raises the flame temperature. This has the effect of increasing the flame speed and distance by 1.5 to 2.0 times the fusing pressure maintaining distance when no swirl flow is given to the auxiliary gas flow, and greatly improving the combustion fusing efficiency.
Further, since the auxiliary gas flow of this high-speed swirling produces a pinch effect as described above, the point contact cutting portion with respect to the metal body is formed in an appropriate small area portion, and an increase in the nozzle crater diameter is increased. It can be reduced by 20% due to the narrowing effect, and the fusing width range is kept slightly uniform to increase the fusing depth and speed.Fused molten iron, slag, noro, etc. are divided by the swirling flow flame and finely melted. It is removed by dropping and rotating and dropping, and it is eliminated by the centrifugal force effect of the swirling flow flame without adhering to the melted part of the metal body and the surface in the vicinity thereof, thereby preventing sphere growth of the droplet and eliminating its removal work. It exhibits excellent operational effects such as.
The spiral angle of the spiral slit flow path of the spiral swirl flow forming ring and the reverse spiral angle of the spiral throttle ring are in the range of 3 to 45 degrees, preferably 5 to 35 degrees, depending on the type and viscosity of the metal body to be melted. By selecting an arbitrary combination, the spiral swirl flow forming ring can be rotated at a high speed of about 600 rpm, the melt pressure maintaining distance of the auxiliary gas flow, and the melt removal effect by the centrifugal force effect by the spiral swirl flow Can be adjusted to an optimum state.
For these reasons, not only general SS materials and relatively thin metal plates of 60 mm or less, but also SCM-435 and 440, Werten materials, etc., can be cut with high precision, and a steel grade of about 1000 mm thick and viscous. It can be applied to fusing without problems.

Thus, in the double spiral swirl flow forming ring in the configuration of (7), the auxiliary gas flow path is divided into the primary side 303 and the secondary side 305 as shown in the specific examples shown in FIGS. In this case, a spiral flow is imparted to the primary side auxiliary gas flow 303 and the secondary side auxiliary gas flow 305. By rotating the spiral slit channel provided with a right angle or a small number of spirals, the number of swirls of the discharge flow from the spiral slit channel 305 outside the discharge flow is increased to, for example, 8/10. The effect of the effect and the pinch effect is achieved more effectively, and the flame becomes a compressed Tornelji flame due to the spiral swirling flow of the primary side auxiliary gas becomes a compressed Tornergy flame due to the helical swirling flow of the secondary side auxiliary gas. Longer distances, and the cutting speed is usually 25-30% when compared with the same cutting ratio as the thick plate Place your experience 40 percent to close to improve. Moreover, the combustion fusing efficiency can be remarkably increased and the fuel gas reduction effect can be obtained with certainty.
Therefore, when the straightness of the flame is doubled, the same amount, the same pressure, and the same area ratio can melt a double-thick metal body, but it depends on the composition and viscosity of the metal body. The degree of straightness of the flame is not 100% proportional. For example, carbon steel is not proportional as the carbon content is low. General mild steel has a maximum straightness increase of 20%, and steel materials rich in carbon, manganese, silicon, chromium, nickel, molybdenum, etc. have a greater effect of increasing the amount.
In general, SS materials can be easily blown with normal straightness, but special steels containing the above components have fusing resistance due to viscosity nearly twice that of SS materials. In addition, vaporized flux is mixed into the fuel gas and alloyed with the melted part metal and the flux component to increase the viscosity, but the melting point can be lowered to increase the degree of straight travel and the fusing speed can be increased rapidly.

On the other hand, for example, the fuel gas and the primary side auxiliary combustion gas are mixed and ignited at the moment of exiting the nozzle tip to ignite and form a flame, but in order to achieve complete mixed combustion, as in the configuration of (4), 30,000 to 40,000 By arranging Gaussian permanent magnets, fuel gas and gasification flux mixed with it are forcibly passed through the strong demagnetizing field of the NN pole and SS pole of the arrayed permanent magnets, and these molecular gases are passed through. It is activated to eliminate any unburned gas.
In addition, by arranging the ejector 500 having the configuration (5) to cover the outer periphery of the front end of the fusing nozzle, the flow of the rear part of the ejector located at the outer peripheral edge of the fusing nozzle due to the ejector effect due to the primary side and secondary side auxiliary combustion gas pressure difference. Ambient ambient air is sucked in from the inlet 501 and a laminar flow of ambient air thin film is discharged from the throttle port 502 at the tip of the ejector, and this ambient air thin film flow flows around the flame from the tip of the fusing nozzle to flow a large amount of ambient air. To prevent contamination, drastically reduce the generation of nitric oxide, which is a warming gas, and when cutting a metal body in a straight line, the molten iron, slag, noro, etc., from which the outside air thin film flow is melted are shown on the rear side (melting section of the metal body). Since it is removed without pulling on the lower end), the cutting speed is increased efficiently, and the radiant heat to the worker is shielded to prevent backfire and a safe and clean working environment with no crater damage. Improvement to.

Furthermore, in general, fusing of a metal body is to blow off the generated oxide at the same time as oxidizing and burning the metal. However, the following conditions are necessary for easily fusing the metal body with a narrower cutting width.
(1) The temperature at which a metal oxidizes and burns is made lower than the melting point temperature of the metal.
(2) To make the melting point temperature of the metal oxide generated by combustion lower than the melting point temperature of the metal and to have fluidity.
The fusing nozzle of the present invention further increases the capability of the burner flame due to a synergistic effect with the spiral swirling auxiliary gas flow by mixing and supplying the vaporized gas fusing flux and fuel gas to the fuel flow path. By improving, the conditions (1) and (2) above are ensured, the metal is oxidized and burned at high speed, and the generated oxide is blown away without adhesion, and the metal body is finished with high precision, narrow width and high quality. It realizes that it cuts.
The flux vaporization technology for gas fusing has been invented by the present inventors and filed in Japanese Patent Application No. 2007-287820 and introduced in detail.

The best mode for carrying out the present invention is provided with the technical conditions described in the above features, and specific embodiments thereof will be introduced in detail in the following examples.

A fusing nozzle N1 for a metal body shown in FIG. 1 is a fuel (fuel gas and vaporization flex) flow path in which a nozzle core is circumferentially arranged in an inner tube 100 and a bearing holder tube 115 that forms an extension thereof. 101, and a peripheral gas (oxygen gas) flow path 103 formed by an outer tube 102 therearound, the auxiliary gas flow path 103 having a fixed spiral throttle slit flow path 104, and the helical throttle downstream thereof. The slit flow path 104 is a fusing nozzle that desires a rotating multi-strand spiral slit flow path 105 in the reverse spiral direction.
The rotary spiral slit flow path 105 is formed by a spiral slit 108 of a single spiral swirl flow forming ring 107 attached to the outer periphery of a bearing holder tube 115 via a bearing 106 so as to be rotatable around a nozzle axis. . The single spiral swirl flow forming ring 107 is supported by screwing the tip portion thereof to the inner periphery of the tip end portion of the bearing holder tube 115 with a screw 109 forming the fuel flow path 100A.
The spiral slits 108 are spirally formed at regular intervals along the nozzle axis, and the spiral angle is inclined 20 degrees to the right from the axial direction toward the nozzle tip.
The spiral throttle slit channel 104 is formed by a spiral throttle slit 114 provided in the large-diameter portion 113 at the front portion of the cylindrical body 112 fitted and fixed to the outer periphery of the inner tube 100. The spiral diaphragm slits 114 are formed at regular intervals along the outer periphery of the large-diameter portion, and the spiral angle is inclined 20 degrees to the left from the axial direction toward the nozzle tip.
This fusing nozzle N1 is a fixed type in which the spiral slit flow path 105 of the rotatable single spiral swirl flow forming ring 107 is desired for the auxiliary gas flow path 101 and is formed by a reverse spiral throttle slit 114 on the upstream side thereof. By making the spiral throttle slit flow path 104 of the helical throttle slit 114 desired, the auxiliary gas flow is once throttled by the spiral throttle slit flow path 104 to increase the pressure, and the discharge pressure flow is changed to the spiral slit 108 of the single spiral swirl flow forming ring 107. Nozzle crater by causing the spiral swirl flow forming ring 107 to rotate at a high speed from the axial direction toward the nozzle tip to the right by this powerful reaction and to impart a high-speed spiral swirl to the gas flow passing through it. Thus, the pinch effect of the flame can be obtained with certainty. If the spiral throttle slit channel 104 is not installed, it is extremely difficult and hardly expected to rotate the single spiral swirl flow forming ring 107 only by the introduction of the gas flow into the spiral slit 108.

A fusing nozzle N2 for a metal body shown in FIG. 2 has a fuel flow channel 201 in which a nozzle shaft core portion is formed by an inner tube 200, and a straight hole in a bearing holder tube 211 that forms an intermediate tube 202 and an extension portion around the fuel flow channel 201. A secondary side auxiliary gas flow path 203 formed on the outer peripheral surface of the intermediate pipe 202 and the bearing holder pipe 211 and an inner peripheral face of the outer pipe 204, and the secondary side Fusing with the auxiliary gas flow path 205 interposing a fixed helical throttle slit flow path 206 and a rotary spiral slit flow path 207 in the reverse spiral direction of the spiral throttle slit flow path 206 downstream thereof. Nozzle.
The rotary spiral slit channel 207 is formed by a spiral slit 210 of a single spiral swirl flow forming ring 209 attached to the outer periphery of the intermediate pipe 202 via a bearing 208 so as to be rotatable around a nozzle axis. .
The spiral slits 210 are spirally formed at regular intervals along the outer periphery of the ring, and the spiral angle is inclined 20 degrees to the left from the axial direction toward the nozzle tip.
The spiral throttle slit channel 201 is formed by a spiral throttle slit 215 provided in the front large-diameter portion 214 of the cylindrical body 213 fitted and fixed to the outer periphery of the intermediate tube 202. The spiral diaphragm slits 215 are spirally formed at equal intervals along the nozzle axis, and the spiral angle is inclined 20 degrees to the right from the axial direction toward the nozzle tip.
The spiral throttle slit channel 215 once squeezes the secondary side auxiliary gas to increase the pressure, and causes the discharge pressure flow to collide and flow into the spiral slit 210 of the single spiral swirl flow forming ring 209, and with this strong reaction, the single spiral swirl flow The forming ring 209 is rotated at a high speed to the right from the axial direction toward the nozzle tip, and a high-speed spiral swirling flow is imparted to the auxiliary gas flow passing through the forming ring 209 so that the spiral swirling jet is ejected from the nozzle crater to ensure the pinch effect of the flame. To get.

3 and FIGS. 4-1 to 4-7 and FIG. 6, the fusing nozzle N3 for a metal body has a nozzle shaft core portion formed by screwing the bearing holder tube 320 and the inner tube 300 together. 301, a secondary side auxiliary gas channel 305 formed by the intermediate side tube 302 and a secondary side auxiliary gas channel 305 formed by the outer pipe 304 are formed around the secondary side auxiliary gas channel 305. In addition, a fixed spiral throttle slit channel 306 and a rotary spiral slit channel 307 in the reverse spiral direction of the spiral throttle slit channel 306 are disposed downstream of the fixed spiral throttle channel 306 so that the primary side auxiliary gas flow The tip of the path 303 is a fusing nozzle constituted by a spiral slit channel 308 that rotates with the spiral slit channel 307 and is formed in the same manner as the spiral slit channel 307.
The rotary spiral slit channel 307 and the spiral slit channel 308 are formed by a spiral slit 312 provided in the outer peripheral part 311a of the double spiral swirl flow forming ring 311 and a spiral slit 313 provided in the inner peripheral part 311b. . The double spiral swirl flow forming ring 311 is located between the outer periphery of the inner tube 300 and the outer tube 304, and the center portion functions as an extension of the intermediate tube 302 and functions as a bearing on the rear outer periphery of the bearing holder tube 320. It is attached via 309 so as to be rotatable around the nozzle axis.
As shown in FIG. 4-6, the spiral slit 312 is formed in multiple spirals at equal intervals along the outer periphery of the ring, and the spiral angle is inclined 20 degrees to the left from the axial direction toward the nozzle tip. As shown in FIG. 4A, the spiral slits 313 are formed in multiple lines at equal intervals in the same direction as the spiral slits 312 and with a slightly weaker spiral angle of 15 degrees. As shown in FIG. 5, the spiral slit 312 and the spiral slit 313 have the same width at the bottom and the upper open surface.
The spiral throttle slit channel 306 is formed by a spiral throttle slit 319 provided in the large diameter portion 318 provided in the outer periphery of the tip portion of the intermediate tube 302. As shown in FIG. 4-6, the spiral throttle slit 319 is formed in multiple spirals at equal intervals along the outer periphery of the large diameter portion 318, and the spiral angle is an axis that is opposite to the spiral slit 312, that is, toward the nozzle tip. It is tilted 20 degrees to the left from the heart direction.
The spiral throttling slit 319 pressurizes the secondary auxiliary gas flow passing therethrough and collides with the spiral slit 312 of the outer peripheral portion 311a of the double spiral swirl flow forming ring 311 to cause the double spiral swirl flow forming ring 311 to be As shown by the arrow R shown in FIG. The rotation of the double spiral swirl flow forming ring 311 causes a spiral swirl flow (spiral) to flow between the primary auxiliary gas from the spiral slit 313 of the inner peripheral portion 311b and the secondary auxiliary gas flow from the spiral slit 312 of the outer peripheral portion 311a. The spiral swirl flow S1 and the spiral swirl flow S2 shown in FIG. 6 are discharged.
In FIG. 6 which shows the fusing state of the metal body 1000, it discharges from the spiral slit 312 of the outer peripheral part 311a by the number of spiral turns of the spiral swirl flow S1 discharged from the spiral slit 313 of the inner peripheral part 311b of the double spiral swirl flow forming ring 311. The number of turns of the spiral swirl flow S2 is increased by 1.2 to 1.8 times by adding a difference to the spiral angle, thereby effectively producing the Coanda effect and the pinch effect. Spiral swirl flow S1 of the side assisted gas becomes a compression Tornelji flame by the spiral swirl flow S2 of the secondary auxiliary gas, the speed is increased and the straightness is doubled and the distance is increased. This usually improves by 25-40%. Moreover, the combustion fusing efficiency can be remarkably increased and the fuel gas reduction effect can be obtained with certainty. The melted iron, slag, noro, etc. are cut off by the swirling flow flame to form fine droplets, which are removed by rotating and dropping, and are attached to the fusing portion of the metal body and its nearby surface by the centrifugal force effect of the swirling flow flame. Without removing it, it prevents the sphere growth of the droplets and eliminates the removal work.
In addition, the outside air thin film flow Ar from the ejector flows around the flame H from the tip of the fusing nozzle to prevent a large amount of outside air from being mixed, greatly reducing the generation of nitric oxide, which is a warming gas, and reducing the metal body. When cutting straight, molten iron, slag, Noro D, etc., from which the outside air thin film flow Ar has been melted, are removed without pulling on the rear surface (the bottom of the molten cross section of the metal body). Shields the radiant heat of the fire, prevents backfire and improves the work environment without a crater damage and a safe and clean environment.

In the fusing nozzle for a metal body shown in FIGS. 1 to 3, any of the spiral slits 108, 210, 312 and 313 and the spiral throttle slits 114, 215 and 319 are arranged at the center of the slit as shown in the cross-sectional view of FIG. The line C is placed on a so-called axial line J that faces the nozzle axis, the bottom surface is a flat surface, and the width of the bottom surface and the upper open surface are the same.

In the fusing nozzle for a metal body shown in FIGS. 1 to 3, a spacer 401 is disposed on the outer periphery of the inner pipes 100, 200, and 300 that form the fuel flow path by positioning the S pole and the N pole along the nozzle axis direction. A plurality of permanent magnets 400 are arranged, and the counter poles between the permanent magnets are made the same polarity of NN and SS as shown in the figure to form an antiferromagnetic field, thereby activating the combustion gas and vaporization flux and increasing the reaction efficiency.

In addition, the outside air is sucked from the rear inlet 501 to the outer periphery of the front part of the fusing nozzle, and the front throttle port 502 is positioned with a narrow annular gap from the outer periphery of the fusing nose tip and fusing from here. A conical cylindrical ejector 500 that discharges and forms a laminar external air thin film flow around the flame from the nozzle tip is screwed together.
The effect of installing the ejector 500 has the effect of preventing global warming as described above, which will be described in detail below.
We have seen the use of fossil fuels, deforestation, pollution and mismanagement of arable soil, and the concentration of carbon dioxide, which has been attracting the most attention as a greenhouse gas in the atmosphere, has increased by 5% over the last 100 years. I am letting. The fuel gas from the fusing nozzle is also a fossil fuel, which must be burned as efficiently as possible to reduce the amount of warming gas.
Combustion of fossil fuel gas generally consists of unburned fuel gas if it is not completely burned, carbon dioxide gas generated by combustion, and air that is abruptly entrained by a high-speed combustion flame of 5 kg / cm2 from the nozzle tip. A large amount of nitric oxide is generated by combustion. When the fuel gas is methane gas, unburned methane is 21 times the greenhouse gas of carbon dioxide gas, and nitric oxide gas is 310 times the greenhouse gas of carbon dioxide gas.
The fusing nozzle of each example is 100% completely burned by the pinch effect of the flame, and there is no unburned fuel gas, but the ejector 500 is also a laminar outside air thin film around the flame from the tip of the fusing nozzle Nitrogen monoxide, which is a warming gas 310 times that of carbon dioxide gas, can form a flow to completely prevent large amounts of outside air from being entrained and drastically reduce the amount of nitric oxide generated by one-third. The drastic reduction effect of gas is attracting attention as a very important fact from the national scale and the global scale.

Next, an assembly example of the fusing nozzle will be described with reference to FIGS. 4-1 to 4-7 using the fusing nozzle N3 shown in FIG. 3 as a model.
4-1 to 4-7 mainly describe the vertical cross section of each part at each assembly step, and the main slit constituent parts, that is, the spiral slit 312, the spiral slit 313, and the spiral aperture slit 319 are shown. A side view is shown in parallel with the longitudinal sectional view.
In the first step shown in FIG. 4-1, the bearing 309 is fitted and fixed to the outer periphery of the rear portion of the bearing holder tube 320, and the inner peripheral portion of the double spiral swirl flow forming ring 311 is screwed and joined to FIG. It is assumed that unit 1 is shown.
In the second step shown in FIG. 4B, the outer peripheral portion 311a is attached and fixed to the inner peripheral portion 311b of the double spiral swirl flow forming ring 311 of the unit 1, and the unit 2 shown in FIG.
In the third step shown in FIG. 4-3, the inner tube 300 is screwed and joined to the rear portion of the bearing holder tube 320 of the unit 2 to form the unit 3 shown in FIG. 4-4.
In the fourth step shown in FIG. 4-4, the permanent magnet 400 and the holding spacer 401 are mounted on the outer periphery of the inner tube 300 of the unit 3 to obtain the unit 4 shown in FIG. 4-5.
The fifth step shown in FIG. 4-5 slidably fits the inner periphery of the front end of the intermediate pipe 302 into the outer periphery of the outer periphery 311a of the double spiral swirl flow forming ring 311 in the unit 4. The two screwing portions 702 are screwed and joined to the rear portion of the intermediate tube 302, and the first screwing portion 701 of the nozzle holder 700 is screwed and joined to the rear portion of the inner tube 300 to form the unit 5 shown in FIG.
In the sixth step shown in FIG. 4-6, the unit 5 is inserted into the outer tube 304 (nozzle case), and the rear portion of the outer tube 304 (nozzle case) is screwed and joined to the third screwed portion of the nozzle holder 700. The unit 6 shown in FIG.
4-7, in the seventh step, the rear portion of the ejector 500 is screwed and joined to the outer periphery of the distal end portion of the outer tube 304 of the unit 6, although not shown. Thereafter, an adapter of each gas supply pipe is connected to the rear part of the nozzle holder 700, and is used for gas cutting of a metal body.

As described in detail in the effect of the invention, the fusing nozzle according to the present invention is a complete combustion of fuel gas from the fusing nozzle, a long-distance injection of the flame, and the circular cut area formed by the flame on the surface of the metal body. The contact cutting part is made into an appropriate small area part, ensuring a high temperature of 3300 to 3800 ° C and the necessary fusing pressure, and fusing width from small to very thick without unreasonably increasing the nozzle tip diameter. Excellent effect of improving the fusing work environment by improving the fusing speed and flawing accuracy at the same time and preventing fouling debris from sticking and preventing backfire due to radiant heat. It presents. Furthermore, although the fusing nozzle of the present invention is slightly expensive, the above effect can be enjoyed by using only the conventional metal fusing device and replacing only the nozzle body. Above all, the nozzle production cost can be recovered in a short period of time due to the effect of saving fuel gas and oxygen gas.

As an example of the fusing nozzle of the present invention, it is a longitudinal cross-sectional explanatory diagram of a specific example of a double structure in which a nozzle shaft core is a fuel gas flow channel and an auxiliary combustion gas flow channel is disposed around it. As an example of the fusing nozzle of the present invention, it is a longitudinal cross-sectional explanatory view of a specific example of a triple structure in which a nozzle shaft core is a fuel gas flow channel and auxiliary combustion gas flow channels are arranged around it. As an example of the fusing nozzle of the present invention, it is a longitudinal cross-sectional explanatory view of another specific example of a triple structure in which the nozzle axis is a fuel gas flow path and auxiliary combustion gas flow paths are arranged around it. It is explanatory drawing which introduced the 1st step of the assembly example of the fusing nozzle of FIG. It is explanatory drawing which introduced the 2nd step of the assembly example of the fusing nozzle of FIG. It is explanatory drawing which introduced the 3rd step of the assembly example of the fusing nozzle shown in FIG. It is explanatory drawing which introduced the 4th step of the assembly example of the fusing nozzle of FIG. It is explanatory drawing which introduced the 5th step of the assembly example of the fusing nozzle shown in FIG. It is explanatory drawing which introduced the 6th step of the assembly example of the fusing nozzle shown in FIG. It is explanatory drawing which introduced the 7th step of the assembly example of the fusing nozzle of FIG. It is a cross-sectional view from arrow AA of the unit 6 of the fusing nozzle of FIGS. 4-7. It is explanatory drawing which shows the fusing condition of the metal body by the fusing nozzle of FIG.

Explanation of symbols

N1 fusing nozzle
100 inner pipe
115 Bearing holder tube
101 Fuel flow path
102 outer pipe
103 Assisted gas flow path
104 Fixed spiral throttle slit channel
105 Rotating multi-spiral spiral slit channel
106 Bearing
107 single spiral swirl forming ring
108 Spiral slit
N2 fusing nozzle
200 inner pipe
201 Fuel flow path
202 Intermediate pipe
211 Bearing holder tube
203 Primary side gas flow path
205 Secondary gas flow path
206 Fixed spiral diaphragm slit flow path
207 Rotary spiral slit channel
208 Bearing
209 Single spiral swirl forming ring
210 Spiral slit
N3 fusing nozzle
320 Bearing holder tube
300 inner pipe
301 Fuel flow path
302 Intermediate pipe
303 Primary gas flow path
304 outer pipe
305 Secondary gas flow path
306 Fixed spiral throttle slit channel
307 Rotating spiral slit channel
308 Spiral slit channel
309 Bearing
311 Double spiral swirl forming ring
311a Outer part
312 Spiral slit
311b Inner circumference
313 Spiral slit
318 Large diameter part
319 Spiral diaphragm slit

Claims (7)

In a fusing nozzle for a metal body in which a nozzle shaft core portion is a fuel flow path, and a auxiliary gas flow path is formed around the fuel flow path, a fixed spiral throttling slit flow path and a downstream of the auxiliary gas flow path A fusing nozzle for a metal body, characterized in that a rotating spiral slit channel having a spiral direction opposite to the spiral throttle slit channel is interposed. In a fusing nozzle for a metal body in which a nozzle shaft core portion is a fuel flow path and a primary side auxiliary gas flow path and a secondary side auxiliary gas flow path are formed around the fuel flow path, the secondary side auxiliary gas flow path A fusing nozzle for a metal body, characterized in that a fixed-type spiral throttling slit channel and a rotating-type spiral throttling channel in the reverse spiral direction of the spiral throttling slit channel are interposed downstream thereof. . In a fusing nozzle for a metal body in which a nozzle shaft core portion is a fuel flow path and a primary side auxiliary gas flow path and a secondary side auxiliary gas flow path are formed around the fuel flow path, the secondary side auxiliary gas flow path A fixed spiral throttle slit flow path and a rotary spiral slit flow path in the direction opposite to the spiral throttle slit flow path downstream from the fixed spiral throttle flow path, A fusing nozzle for a metal body, characterized by interposing a straight flow slit channel or a spiral slit channel that rotates together with a rotating spiral slit channel. 2. A plurality of permanent magnets are arranged around the fuel flow path along a nozzle axis direction with a south pole and a north pole, and the opposing poles between the permanent magnets have the same polarity. The fusing nozzle for a metal body according to any one of claims 3 to 4. At the outer periphery of the fusing nozzle tip, the ambient air is sucked from the rear inlet, and the front throttle is positioned with a narrow annular gap from the fusing nozzle outer tube tip, from here the fusing nozzle tip 5. The fusing nozzle for a metal body according to claim 1, wherein a conical cylindrical ejector that discharges and forms an outer air film flow around the flame is screwed and connected. The fusing nozzle for a metal body according to any one of claims 1 to 2, wherein the rotating spiral slit channel is formed by a single spiral swirl flow forming ring that is rotatably provided. 6. The rotary spiral slit channel and the straight flow slit channel or spiral slit channel are formed by a double spiral swirl flow forming ring that is rotatably provided. The fusing nozzle for metal bodies as described in any one.

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