KR20200053852A - Gas cutting device - Google Patents

Abstract

Provided is a gas cutting apparatus which can make possible at least environmentally-friendly use of a mixture gas of hydrogen and oxygen (hydrox gas), reduce the thermal impact when cutting a parent metal of a rear plate (rear materials) or (high-strength) casting pieces through an optimized design for improving the diffusion of flames or the like, minimize the cutting width, and make it possible to rapidly cut such things. According to an embodiment of the present invention, the gas cutting apparatus comprises: an apparatus head including an oxygen flow path and a fuel gas flow path into which oxygen and fuel gas are introduced, respectively; an inner nozzle which is fastened with the apparatus head and includes an oxygen passage communicating with the oxygen flow path, and a cut groove; and an outer nozzle which is fastened with the apparatus head on the outside of the inner nozzle and forms a fuel gas passage communicating with the fuel gas flow path and the cut groove with the inner nozzle interposed therebetween. The cut groove of the inner nozzle has the bottom surface and an opened surface, which have different lengths from each other.

Description

Gas cutting device {GAS CUTTING DEVICE}

The present invention relates to a gas cutting device, preferably through at least an environmentally friendly water-oxygen mixed gas (hydrox gas) while using an optimized design, such as improving the diffusibility of the flame, thick plate (thick material) or ( High-strength) It relates to a gas cutting device that reduces heat effects when cutting a base material such as a cast, minimizes the cutting width, and enables rapid cutting.

The gas cutting of the base material (material) known so far is mainly based on fossil fuels such as LNG, for example, for supplying fossil fuels such as LNG, preheating oxygen and cutting (high pressure) oxygen to the nozzle, and preheating. The intensity of the flame was controlled by adjusting the supply of oxygen.

By the way, the nozzle hole (hole) to which oxygen for cutting is supplied increases in proportion to the thickness of the base material so that the air flow of oxygen can reach the base material (cast iron, etc.). When the melting loss width increases, the oxygen consumption increases.

That is, as the thickness of the base material increases, the nozzle hole and gas amount of the cutting oxygen must also increase proportionately, for example, several types of nozzles that can be used for each thickness of the base material must be prepared and replaced.

On the other hand, instead of fossil fuels such as LNG, a technique using a hydrogen-oxygen mixed gas is known. For example, in KR 10-2006-0129742 A (2006.12.18), a hydrogen-oxygen mixed gas Disclosed is a cutting device using.

However, the KR patent only schematically discloses a nozzle for a water / oxygen mixed gas, and does not reflect an optimized design of a nozzle that makes the cutting nozzle (device) more suitable for a water / oxygen mixed gas.

Particularly, in recent years, a gas cutting technique more optimized for a base material (material) having a thickness, such as a cast plate such as a thick plate, a thick material, or a slab, is required.

KR 10-2006-0129742 A (2006.12.18)

The present invention has been devised to solve the above-described conventional problems, and its purpose is to optimize the design, such as improving the diffusibility of the flame, while at least enabling the use of an environmentally friendly hydrogen-oxygen mixed gas. Through this, it is to provide a gas cutting device that reduces heat influence when cutting a base material such as a thick plate (thick material) or a (high strength) cast, minimizes the cutting width, and enables rapid cutting.

Gas cutting device of the present invention in one technical embodiment for achieving the above object, the device head including an oxygen flow path and a fuel gas flow path to which oxygen and fuel gas flow; And, fastened to the device head, the An internal nozzle including an oxygen passage and a cut groove communicating with the oxygen passage; And an outer nozzle which is fastened to the device head outside the inner nozzle and forms a fuel gas passage communicating with the fuel gas passage and the cut groove between the inner nozzles, wherein the cut groove of the inner nozzle comprises: The bottom surface and the opening surface may be configured to have different lengths.

Preferably, the cut grooves of the inner nozzle may be formed in an equilateral trapezoid, the base angles of which are the same, and the lengths of both diagonals are the same.

More preferably, the cut groove of the inner nozzle may be formed to have a smaller height at the outlet side where the fuel gas is externally ejected than the height at the inlet side where the fuel gas flows from the fuel gas passage.

In addition, the cut groove of the inner nozzle may further include an inclined step formed on the exit side of the cut groove, or the lower surface of the cut groove inclined in the radial direction from the entrance side to the exit side.

Preferably, the cut groove of the inner nozzle may be inclined in the longitudinal direction from the inlet side where the fuel gas is introduced from the fuel gas passage to the outlet side where the fuel gas is externally discharged, or may be curved at least partially in the longitudinal direction. .

More preferably, the cut groove of the inner nozzle is smaller in height from the inlet side where the fuel gas flows from the fuel gas passage to the outlet side where the fuel gas is externally ejected, and in addition to the inclination of the bottom surface thereof in the radial direction. It may be formed inclined in the longitudinal direction from the inlet side to the outlet side.

In addition, the gas cutting device of the present invention of another technical embodiment, the device head including an oxygen flow path and a fuel gas flow path through which oxygen and fuel gas flow; And, the fastener is connected to the device head, and the oxygen passage to communicate with the oxygen flow path An inner nozzle including a furnace and a cut groove; And an outer nozzle which is fastened to the device head outside the inner nozzle and forms a fuel gas passage communicating with the fuel gas passage and the cut groove between the inner nozzles, wherein the cut groove of the inner nozzle comprises: The height of the fuel gas flows from the inlet side where the fuel gas flows from the fuel gas passage to the outlet side where the fuel gas is discharged, and the bottom thereof is inclined in the radial direction, or is configured to be inclined in the longitudinal direction from the inlet side of the cut groove to the outlet side. Can be.

Preferably, the cut groove of the inner nozzle may be configured to be inclined in the longitudinal direction from the inlet side to the outlet side, in addition to the smaller inclination in the radial direction from the inlet side to the outlet side.

More preferably, the external nozzle is composed of an external nozzle body fastened to the device head and an external nozzle tip fastened to the external nozzle body, wherein the external nozzle or the internal nozzle surrounded by the external nozzle tip The covering section of the distal end of the can be varied.

At this time, in the covering section of the front end of the inner nozzle, one of the outer nozzles or the outer nozzle tips having different lengths is selectively fastened to the device head or the outer nozzle body, or the device head or the outside of the outer nozzle or outer nozzle tip When fastening with the nozzle body, it can be changed by adjusting the fastening depth or fastening through the thickness adjustment ring.

Preferably, the external nozzle is composed of an external nozzle body that is fastened to the device head and an external nozzle tip that is fastened to the external nozzle body, and the outer nozzle or a tip of the external nozzle tip is cut from the internal nozzle. A second cut groove that selectively communicates with the groove may be further formed.

At this time, the second cut groove of the outer nozzle or the outer nozzle tip, depending on the degree of rotation when fastening the device head of the outer nozzle or the outer nozzle tip and the outer nozzle body, or through the thickness adjustment ring, the inner nozzle The cut grooves can be matched to be in communication or staggered with each other.

In addition, a plurality of cut grooves of the inner nozzle are formed along the outer edge of the inner nozzle, and the fuel gas may include a mixture of water and oxygen.

The gas cutting device of the present invention may use fossil fuels such as LNG, but when cutting a base material based on an environmentally friendly hydrogen-oxygen mixed gas (hydrox gas), it improves flame characteristics and the like to optimize the design environment. Can provide

That is, the present invention, while using at least a water-oxygen mixed gas, while reducing the upper melt width of the base material during gas cutting to reduce the thermal deformation of the base material due to the heat effect, it is also possible to reduce the generation of fume by reducing the melting loss Provides the effect.

In addition, ultimately, the present invention reduces the cutting time of a base material, such as a cast piece having a thickness, while reducing fuel costs, and also increases the effect of increasing the removal rate of a lower burr of the base material during gas cutting. Is to provide.

1 and 2 is an overall configuration diagram showing the overall configuration of the gas cutting device of the embodiments according to the present invention
Figure 3 is a main part side and front configuration diagram showing the device of the present invention of Figure 1
Figure 4 is a main part side and front configuration diagram showing the device of the present invention of Figure 2
5 is a main part side and front configuration diagram showing another embodiment of the device of the present invention of FIG.
Figure 6 is a main part side view showing another embodiment of the device of the present invention of Figure 5
Figure 7 is a main part side and front configuration diagram showing another embodiment of the device of the present invention of Figure 4
8 is a main part side and front configuration diagram showing another embodiment of the apparatus of the present invention of FIG.
9 is a main part side and front configuration diagram showing still another embodiment of the device of the present invention of FIGS. 5 and 7
10 is a main part side and front configuration diagram showing another embodiment of the apparatus of the present invention of FIG.
11 is a main part side and front configuration diagram showing another embodiment of the apparatus of the present invention of FIG.
12 is a main part side and front configuration diagram showing another embodiment of the apparatus of the present invention of FIGS. 10 and 11
13 to 17 are main part side views showing various embodiments of a variable state of an inner nozzle covering section by an external nozzle or the like in the apparatus of the present invention.
18 to 20 are main part side and front configurations and enlarged views showing still another embodiment of the apparatus of the present invention of FIGS.

Hereinafter, the present invention will be described in detail through exemplary drawings. It should be noted that in adding reference numerals to the components of each drawing, the same components have the same reference numerals as possible even though they are displayed on different drawings. In addition, in describing the present invention, when it is determined that detailed descriptions of related well-known structures or functions may obscure the subject matter of the present invention, detailed descriptions thereof will be omitted.

Hereinafter, preferred embodiments of the present invention will be described in detail.

First, in FIGS. 1 to 3, the gas cutting apparatus 100 according to the present invention is illustrated in an overall configuration view and a main part side view.

That is, as shown in FIGS. 1 and 3, the gas cutting device 100 according to the present invention is a device having flow paths 112 and 114 through which oxygen (O ₂ ) and fuel gas (HG) are introduced. The inner nozzle 140, which is fastened to the head 110, the device head 110, and the oxygen passage 120 through which oxygen is ejected and the cut grooves 130 through which fuel gas is ejected, are respectively formed. While being fastened to the device head 110 outward, it may be basically provided, including an outer nozzle 160 that forms a fuel gas passage 150 communicating with the cut groove between the inner nozzles.

In addition, as shown in FIGS. 1 and 2, the device head 110 has an integral (screw) fastening part 116 having a predetermined length in which the inner nozzle 140 and the outer nozzle 160 are fastened in a screw form, respectively. (118) may be further included.

In addition, as shown in FIG. 2, in the gas cutting apparatus 100 of the present invention, the outer nozzle 160, the outer nozzle body 162 fastened to the fastening portion 118 of the device head 10 , It may be provided as an outer nozzle tip 164 that is screwed to the fastening portion 166 provided on the outer nozzle body 162.

In addition, as shown in FIG. 3, the cut grooves 130 of the inner nozzle 140 may be dug (processed) at equal intervals along the circumferential direction with an outer edge of the tip of the inner nozzle to form a plurality. .

Therefore, oxygen (O ₂ ) is supplied to the oxygen passage 112 (which is not shown in the oxygen supply line is connected) formed through the central side of the device head 110, at the same time fuel gas (HG) is the device head 110 ) Is supplied to the fuel gas passage 114 (not shown fuel gas supply line is connected), these are the oxygen passage 120 through the center of the inner nozzle 140 and the inner nozzle 160 and the outside It is introduced (injected) into the fuel gas passage 150 formed between the nozzles 160.

And, the fuel gas (HG) is an outer edge of the inner nozzle 140 communicating with the fuel gas passage 150, a plurality of integrally dug along the circumferential direction to form a groove (processed) cut groove 130 ), And is externally ejected from the end (tip), and oxygen is ejected from the end of the central oxygen passage 120 of the inner nozzle 140.

At this time, each of the front end portion 160a of the external nozzle tip 164 fastened to the external nozzle body 162 shown in FIG. 2 or the external nozzle 160 shown in FIG. 1, as shown in FIG. The inner nozzle 140 is in the form of being in close contact with the tip portion 140a, and thus the opening face 134 of the top cross-section of the cut groove 130 is partially surrounded by the tip of the outer nozzle or the outer nozzle tip. Becomes.

Therefore, high-pressure oxygen for cutting the base material of the cast iron or the like is ejected from the end (the tip portion) of the central oxygen passage 120 of the tip portion 140a of the inner nozzle 140, and the fuel gas (HG) is the inner nozzle 140 ) Is ejected in the form of surrounding the oxygen at the end (tip) of the cut groove 130, and ignited thereon to form the flame (flame) for cutting the base material.

On the other hand, the fuel gas used in the gas nozzle device 100 of the present invention, which is described in the present embodiment, may preferably be a water-oxygen mixed gas (hydrox gas, HG). However, it is not necessarily limited to this.

For example, in the gas cutting device 100 of the present invention shown in FIGS. 1 and 2, preferably, a water / oxygen mixed gas (HG) is linked through the fuel gas flow path 114 of the device head 110. It can be supplied through the supply line.

As is known, the water-oxygen mixed gas (HG) as described above can be obtained through electrolysis of water (H ₂ O), and oxygen is included in this process, so that the existing oxygen for preheating is unnecessary.

However, instead of the water-oxygen mixed gas (HG), the fuel gas flow path 114 is supplied with preheated oxygen (O ₂ ) through multiple connected supply lines, and then fossil fuel (LNG) is supplied to the oxygen flow path It is also possible to form a flame like the high-pressure oxygen supplied to (112).

That is, the gas cutting apparatus 100 of the present invention may be both a fossil fuel furnace or a mixture of water and oxygen (HG) as fuel gas.

However, in the case of using fossil fuels, the oxygen nozzle hole becomes large in proportion to the thickness of the cast steel when cutting the cast steel, etc., which increases the oxygen nozzle hole when the base material thickness increases, resulting in a large cutting width of the cast steel when cutting the base material, and eventually melting loss. Meanwhile, oxygen consumption also increases.

Thus, preferably, in this embodiment, at least a water-oxygen mixed gas (HG) can be used as the fuel gas.

The water-oxygen mixed gas (HG) may form a straight flame rather than fossil fuel, and thus has a large cutting effect with a small amount of heat, a small cutting loss surface, and may be a more environmentally friendly fuel.

In the case of LNG (CH ₄ ), which is fossil fuel, a lot of by-products are generated due to combustion by 'C' when cutting, but the amount of fume generated is large, but the mixture of water and oxygen (HG) is 'C' by cutting H ₂ By reducing the adverse effects caused by ', it is possible to reduce the generation of fume even with an environmentally friendly gas itself.

In particular, as in the following description of the present embodiment, the gas cutting device 100 of the present invention can provide a cutting device that is more optimized in the use of a mixed water-oxygen gas (HG).

However, in the following description of the present embodiment, the water-oxygen mixed gas (HG) and the like are collectively described as fuel gas (HG).

Next, FIG. 4 shows a gas cutting device 100 according to another embodiment of the present invention.

That is, as shown in Figure 4, the cut groove 130 of the inner nozzle 140 of the device of the present invention, (instead of the rectangular cut groove 140 shown in Figure 3), the top cross section of the cut groove on the lower side The bottom surface 132 and the upper opening surface 134 may be provided in a form having different lengths (X) (Y).

More preferably, the cut grooves 130 of the inner nozzle 140 are provided in equal (reverse) equilateral trapezoids having opposite base angles (a) of the bottom surface 132 and equal lengths of the diagonal lines (b) at both sides. It may be, for example, it may be designed to reduce the cross-sectional area of 0.6 to 0.9 times the cross-sectional area of the rectangular cut groove 140 shown in FIG. 3.

In this case, the equilateral trapezoidal cut groove 130 of the present invention shown in FIG. 4 enhances the intensity of the flame of the fuel gas when the pressure of the fuel gas HG is the same pressure, and the speed at which the flame is delivered to the base material And this will enable high-speed cutting of base materials such as cast steel with a thickness of 100 mm or more, which is difficult to cut, for example, and will also reduce the occurrence of burrs (cutting snow). It will reduce the defect factors.

For example, according to the known Bernoulli equation, the mass flow rate (m) = density * area * velocity (ρ × A × V), where the equilateral trapezoidal cut groove 130 of the inner nozzle 140 of FIG. 4 When the cross-sectional area (A2) is reduced to 0.6 to 0.9 times the cross-sectional area (A1) of the rectangular cut groove in Fig. 3, in the case of the same density (ρ constant) and incompressible flow, m1 = ρ1 x A1 x V1 = m2 = ρ2 x (0.6 ∼0.9) A2 × V2, ρ1 × A1 × V1 = ρ2 × (0.6-0.9) A2 × V2, and thus V2 = V1 × A1 / (0.6-0.9) A2, V2 = V1 / (0.6-0.9) = (1.66 ~ 1.11) m / s.

That is, when the same density (ρ is constant) and the fuel gas is an incompressible flow, the cross-sectional area (A2) of the cut groove (130) of the inner nozzle (140) of the present invention is a cross-sectional area (A2) of the equilateral trapezoid of the rectangle of FIG. ), The cross-sectional area decreases, so the flow velocity (V) increases, and the flow rate of the fuel gas does not change with the law of conservation of mass.

Therefore, in the gas cutting apparatus 100 of the present invention, as shown in FIG. 4, the area of the cut grooves 130 provided in the circumferential direction (at equal intervals) as the outer edge of the inner nozzle 140 is rectangular to equilateral trapezoidal. It can be seen that, when designed by reducing (reducing) a part, the flow velocity of the fuel gas increases in the case of the same density and incompressible flow.

In addition, in the case of the inner nozzle cut groove 130 of the present invention, the bottom 132 (short side) of the lower side has a smaller area of contact with the fuel gas than the long sides of both sides, thereby reducing the frictional force of the fuel gas. It will make the flow rate faster.

Therefore, in the case of the gas cutting apparatus 100 of the present invention, through the improvement of the structure of the inner nozzle cut groove 130 through which fuel gas (HG) passes and is ejected externally, the speed at which the flame is delivered to the base material is increased and the flame spreads. By further forming, it is possible to more quickly cut the cast pieces having a thickness, etc., and to increase the burr removal rate of the base material during cutting.

Meanwhile, preferably, the lengths (X, Y) of the lower bottom surface 132 and the upper opening surface 134 on the front end face of the cut groove 130 of the inner nozzle 140 of FIG. 4 are different, The improvement of the structure formed in an isosceles trapezoid shape is not necessarily limited to the mixed water-oxygen gas (HG), and may be applicable even when using fossil fuels.

Next, FIG. 5 shows another embodiment of the gas cutting apparatus 100 of the present invention of FIG. 4.

That is, as shown in Figure 5, the cut groove 130 of the inner nozzle 140 of the device of the present invention, the height 'H1 of the inlet side (130a) of the fuel gas (HG) flows from the fuel gas passage 150 The height 'H2' of the outlet side 130b from which the fuel gas is externally ejected may be formed differently, specifically, the outlet of the cut groove than the height 'H1' of the inlet side 130a of the cut groove 130 It is to make the height 'H2' of the side 130b smaller.

However, here, the position of the inlet side 130a of the cut groove 130 is not an inclined portion that is initially connected to the fuel gas passage 150 during processing of the cut groove 130, as in the enlarged view of FIG. 5. It means the position that starts the plane through the inclined portion, and therefore the entrance height 'H1' also means the height on the plane.

In addition, in the following description of the present embodiment, the entrance side 130a of the cut groove is based on the position described above.

On the other hand, as the height gradually decreases from the entrance side 130a of the inner nozzle cut groove 130 to the exit side 130b, the bottom surface 132 of the cut groove is inclined in a radial direction, for example, of an acute angle It can be made to have a depth angle (c).

Therefore, as shown by the arrow in FIG. 5, the fuel gas HG ejected from the end (the front end) of the inner nozzle cut groove 130 is a flame formed from the center toward the outside in the radial direction of the inner nozzle. Diffusion can be achieved.

For example, the water-oxygen mixed gas (HG) forms a straight flame to provide the maximum cutting effect with a small amount of heat, but the upper melting width of the base material (cast steel) is higher than that of fossil fuels due to its high temperature of 2500 ° C or higher. Large phenomena may occur.

However, the gas cutting unit 100 of the present invention shown in FIG. 5 increases the diffusibility of the flame to further diffuse the straight flame of the water-oxygen mixed gas (HG), so that the (high-speed) cutting of the base material is possible. In doing so, the melting area of the upper surface of the base material is reduced, which will reduce the cutting width and make the cutting of the thick base material stably.

On the other hand, as shown in Figure 6, the diffusion of such a flame, the inclined step toward the outer edge from the center in the radial direction of the inner nozzle 140 on the underside 132 side of the outlet side 130b of the inner nozzle 140 (136) ). (Refer to the arrow of fuel gas (HG))

Next, FIG. 7 shows another embodiment of the gas cutting apparatus 100 of the present invention of FIG. 4.

That is, as illustrated in FIG. 7, the cut groove 130 of the inner nozzle 140 is an outlet through which fuel gas is externally ejected from the inlet side 70a through which the fuel gas flows from the fuel gas passage 150. The side 70b may be inclined in the longitudinal direction in a plane, for example, to have a rotation angle d.

In this case, since the fuel gas (HG) of FIG. 7 is ejected from the end of the cut groove of the inner nozzle while rotating, as shown by the arrow, the fuel gas is rotated through a stream of high-pressure oxygen ejected from the center of the inner nozzle, In this way, when the flame is rotated, the concentration of the flame transferred to the cutting base material is provided, and the diffusion of the flame described above is also provided.

That is, as described above, when the flame is rotated and diffused, as described above, there is no problem even when using a water-oxygen mixed gas (HG) having a straight flame property to increase the upper melting width of the base material.

Alternatively, as shown in FIG. 8, the cut groove 130 of the inner nozzle 140 of the present invention may be provided in a shape that is curved at least partially in its longitudinal direction on a plane. In this case, as shown in Fig. 7, the flame will be rotated and diffused.

In addition, as shown in FIG. 9, in the case of the gas cutting device 100 of the present invention, as described in FIGS. 5 and 7, the cut groove 130 of the inner nozzle 140 is inlet side 130a In addition to having a depth angle (c) of an acute angle in which the base 132 is inclined in the radial direction as the height becomes smaller from) to the exit side 130b, it is flat to the exit side 70b from the entrance side 70a. It is possible to have a rotation angle (d) that is inclined in the longitudinal direction.

That is, it may be possible to process the cut groove 130 to have the depth angle of the acute angle and the inclined rotation angle simultaneously.

Therefore, it will be possible to simultaneously spread and rotate the flame than in the case of FIG. 9.

In the end, in the case of the gas cutting apparatus 100 of the present invention shown in Figs. 4 to 9 so far, the upper surface of the base material is melted even when a mixed gas of water / oxygen (HG) having straightness and high temperature characteristics of the flame is used. By reducing the phenomenon of widening, it is possible to provide a more optimized gas cutting environment.

Next, in FIGS. 10 to 12, in the gas cutting apparatus 100 of the present invention described above with reference to FIGS. 5, 7 and 9, the cut groove 130 of the inner nozzle 140 is rectangular as shown in FIG. 3. It also shows that it is applicable in the case of.

That is, the gas cutting apparatus 100 of the present invention, whether the cut groove 130 of the inner nozzle 140 is rectangular or an equilateral trapezoid, further increases the spreadability and rotation of the flame, the inner nozzle cut groove 130 The height decreases from the inlet side 130a toward the outlet side 130b, such that the bottom surface 132 is inclined in the radial direction, for example, to have a depth angle c of an acute angle, and / or an outlet side from the inlet side 130a. For example, it may be made to have a rotation angle d, for example, to be inclined in the longitudinal direction with 130b.

In this case also, it will be possible to improve the cutting efficiency through the diffusion of the flame as described above.

Next, as described above, the gas cutting device 100 of the present invention, as shown in FIG. 1, has an integral external nozzle 160 fastened to the device head 110, or, as shown in FIG. 2, the device head It may be composed of an outer nozzle body 162 fastened to (10), and an outer nozzle tip 164 fastened to the outer nozzle body 162.

On the other hand, as shown in Figures 13 to 17, in the gas cutting apparatus 100 of the present invention, the outer nozzle 160 or the outer nozzle tip 164 is surrounded by the tip of the inner nozzle 140 covering section (covering section, CS) may be variable. (However, in FIGS. 13 to 17, the outer nozzle tip 164 is mainly shown, but the integral outer nozzle 160 as shown in FIG. 1 is of course applicable. )

That is, the covering section CS of the inner nozzle tip portion 140a is such that the outer nozzle 160 or the tip portion 160a of the outer nozzle tip 164 surrounds the tip portion 140a of the inner nozzle 140. In other words, varying the covering section CS of the inner nozzle tip 140a means that the degree of enclosing the tip of the inner nozzle can be adjusted with the tip of the outer nozzle or the outer nozzle tip.

For example, as shown in FIGS. 13 to 15, when the outer nozzles 160 or the outer nozzle tips 164 having different lengths are prepared and one of them is selectively fastened to the device head 110, the inner nozzles The front end covering section may be adjusted.

Alternatively, as shown in FIGS. 1 and 2 and 13 to 15, when the external head 160 or the external nozzle tip 164 having the same length is fastened to the device head 110 or the external nozzle body 162, the Even if the fastening depth (FD) is adjusted, the degree to which the tip portions 160a of the outer nozzles cover the tip portion 140a of the inner nozzle 140 can be adjusted.

Or, when fastening the device head 110 or the outer nozzle body 162 of the integral outer nozzle 160 or the outer nozzle tip 164 having the same length, as shown in Figure 16, a plurality of thickness adjustment ring having the same thickness It may be possible to fasten through 180 or, as shown in FIG. 17, through thickness adjusting rings 180 having various thicknesses. At this time, it is natural that the thickness of the thickness adjustment ring 180 is appropriately set in advance.

Therefore, in the case of the gas cutting apparatus 100 of the present invention shown in FIGS. 13 to 17, the front end portion 160a of the integral outer nozzle 160 of FIG. 1 or the outer nozzle tip 164 of FIG. 2 is an inner nozzle ( It is possible to vary the covering section (CD), which encloses (covers) the tip portion 140a of 140), encloses it in conformity (covers the tip portion to be on the same line), or surrounds it in a more protruding shape. do.

In the end, in the gas cutting apparatus 100 of the present invention, the range of the flame (diffusion degree) by the fuel gas (HG) ejected from the end (tip) of the cut groove 130 of the inner nozzle 140 is adjusted. Is to make things possible.

For example, in the case of a thin material having a thin base material, as shown in FIG. 15, the tip portion 160a of the outer nozzles 160 and 164 protrudes more than the tip portion 140a of the inner nozzle 140 to increase the flame range. You can narrow it down.

Conversely, when the thickness of the base material is thick, as shown in FIGS. 13 and 14, the tip portions 160a of the outer nozzles 160 and 164 are made to protrude or coincide less than the tip portions 140a of the inner nozzle 140, If a portion of the tip portion 140a of the inner nozzle 140 is opened or covered, the range of the flame may be widened.

Accordingly, the gas cutting apparatus 100 of the present invention shown in FIGS. 13 to 17 enables at least the adjustment of the volcanic range of the flame, thereby enabling optimal cutting in response to the (thickness) characteristic of the cutting base material. This will make it possible to reduce the thermal deformation or upper melt width by reducing the thermal effect of the base material.

For example, even in the case of the gas cutting apparatus 100 of the present invention shown in FIGS. 13 to 17, at least an appropriate range of flame is adjusted when using a water-oxygen mixed gas (HG) having a straight flame property and a high temperature property. This will provide a more optimized design environment for gas cutting.

Next, FIGS. 18 to 20 show other embodiments of the gas cutting apparatus 100 of the present invention.

That is, as shown in FIGS. 18 and 19, in the gas cutting device 100 of the present invention, the inner outer nozzle 160 of FIG. 1 or the outer nozzle tip 164 of FIG. 2 (to the tip side) has its inner surface. Optionally, a second cut groove 170 that can communicate with the cut groove 130 of the inner nozzle 140 may be further provided.

The second cut groove 170 of the outer nozzle of the present invention, preferably when fastening with the device head 110 or the outer nozzle body 162 of the outer nozzle 160 or the outer nozzle tip 164 Depending on the degree of rotation, it is arranged to match or stagger the cut groove 130 of the inner nozzle.

That is, as shown in FIGS. 18 and 19, when the device head 110 or the outer nozzle body 162 of the integral outer nozzle 160 or the outer nozzle tip 164 is fastened, the rotation degree is adjusted to adjust the inner nozzle cut groove ( 130) and when the second cut groove 170 on the outer nozzle side coincides, the fuel gas may be further diffused and ejected from the front end of the device, thereby making it possible to further adjust the degree of flame spread.

This makes it possible to adjust the degree of diffusion of the flame even when using a water-oxygen mixed gas (HG) having the linear flame characteristics described above, thereby providing a more suitable cutting environment for cutting base metals such as cast iron.

On the other hand, as shown in Figure 20, the second cut groove 170 may be appropriately provided in various forms such as a rectangular (square) (not shown), equilateral trapezoid, semicircular, triangular, etc. as described above in cross section.

Accordingly, according to the gas cutting device of the present invention described so far, fossil fuels such as LNG can be used, but preferably, when cutting a base material based on an environmentally friendly water / oxygen mixed gas, flame characteristics, etc. It will be improved to provide a more optimized cutting environment.

That is, while using at least a water-oxygen mixed gas, it is possible to reduce the upper melt width of the base material during gas cutting to reduce the thermal deformation of the base material due to heat influence, and also to reduce the generation of fume by reducing the melting loss.

Accordingly, while cutting the cutting time of the base material such as a cast piece having a thickness, it is possible to reduce the fuel cost, and to increase the removal rate of the lower burr of the base material during gas cutting.

The above description is merely illustrative of the technical idea of the present invention, and those of ordinary skill in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present specification and drawings are not intended to limit the technical spirit of the present invention, but to explain the technical spirit of the present invention, and the scope of the technical spirit of the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the claims below, and all technical spirits within the equivalent range should be interpreted as being included in the scope of the present invention.

100 .... Gas cutting device 110 .... Device head
112 .... Oxygen flow path 114 .... Fuel gas flow path
116,118,166 .... Joint part 120 .... Oxygen passage
130 .... Inner nozzle cut groove 130a .... Cut groove entrance
130b .... Cut groove exit 132 .... Bottom of cut groove (lower)
136 .... Inclined step 134 .... Cut groove (upper) opening
140 .... Internal nozzle 150 .... Fuel gas passage
160 .... External nozzle 162 .... External nozzle body
164 .... External nozzle tip 170 .... 2nd cut groove
180 .... thickness adjustment ring HG .... fuel gas
H1 .... Height of the entrance side of the inner nozzle cut groove
H2 .... Height of the outlet side of the inner nozzle cut groove

Claims (13)

A device head including an oxygen passage and a fuel gas passage through which oxygen and fuel gas flow;
An inner nozzle that is fastened to the device head and includes an oxygen passage communicating with an oxygen passage, and a cut groove; And,
An external nozzle that is fastened to the device head outside the internal nozzle and forms a fuel gas passage between the internal nozzle and the fuel gas passage and a cut groove;
Consisting of, including
The cut groove of the inner nozzle, the gas cutting device having a different length of the bottom surface and the opening surface.
According to claim 1,
A gas cutting device in which the cut grooves of the inner nozzle are formed in equilateral trapezoids having the same base angles and equal lengths of the diagonals on both sides.
According to claim 1,
The cut groove of the inner nozzle is a gas cutting device formed to have a smaller height on the outlet side where the fuel gas is externally ejected than on the inlet side where the fuel gas flows from the fuel gas passage.
According to claim 3,
The cut groove of the inner nozzle decreases in height as it goes from the inlet side to the outlet side, and the bottom surface is inclined in the radial direction.
Gas cutting device further comprises an inclined step formed on the outlet side of the cut groove.
According to claim 1,
The cut groove of the inner nozzle is inclined in the longitudinal direction from the inlet side where the fuel gas flows from the fuel gas passage to the outlet side where the fuel gas is externally ejected.
A gas cutting device that is curved at least partially in the longitudinal direction.
According to claim 1,
The cut groove of the inner nozzle decreases in height from the inlet side where the fuel gas flows from the fuel gas passage to the outlet side where the fuel gas is discharged to the outside, and in addition to the inclination of the bottom surface in the radial direction, the outlet from the inlet side Gas cutting device inclined in the longitudinal direction to the side. A device head including an oxygen passage and a fuel gas passage through which oxygen and fuel gas flow;
An inner nozzle that is fastened to the device head and includes an oxygen passage and a cut groove communicating with the oxygen passage; And,
An outer nozzle that is fastened to the device head outside the inner nozzle and forms a fuel gas passage between the inner nozzle and the cut gas groove and the cut groove;
Consisting of, including
The cut groove of the inner nozzle decreases in height from the inlet side where the fuel gas flows from the fuel gas passage to the outlet side where the fuel gas is externally ejected, and the bottom surface thereof is inclined in the radial direction.
Gas cutting device inclined in the longitudinal direction from the inlet side to the outlet side.
The method of claim 7,
The cut groove of the inner nozzle is smaller in height as it goes from the inlet side to the outlet side, and in addition to its inclined radial direction, the gas cutting device inclined in the longitudinal direction from the inlet side to the outlet side.
The method according to any one of claims 1 to 8,
The external nozzle is composed of an external nozzle body fastened to the device head and an external nozzle tip fastened to the external nozzle body,
A gas cutting device in which the outer nozzle or the covering section (CS) of the tip of the inner nozzle surrounded by the outer nozzle tip is variable.
The method of claim 9,
The covering section of the tip of the inner nozzle,
One of the external nozzles or external nozzle tips of different lengths is selectively fastened to the device head or the external nozzle body, or
When fastening the device head or external nozzle body of the external nozzle or external nozzle tip, adjust the fastening depth (FD) or fasten it through a thickness adjustment ring,
Variable gas cutting device.
The method according to any one of claims 1 to 8,
The external nozzle is composed of an external nozzle body fastened to the device head and an external nozzle tip fastened to the external nozzle body,
A gas cutting device further comprising a second cut groove at least selectively communicating with the cut groove of the inner nozzle at the tip of the outer nozzle or the outer nozzle tip. The method of claim 11,
The second cut groove of the outer nozzle or the outer nozzle tip, when fastened with the outer nozzle or the device head of the outer nozzle tip or the outer nozzle body, depending on the degree of rotation, or through the thickness adjustment ring of the inner nozzle A gas cutting device that is aligned with the cut groove or is staggered with each other.
The method of claim 1 or 7,
A plurality of cut grooves of the inner nozzle is formed along the outer edge of the inner nozzle,
The fuel gas is a gas cutting device containing a mixed water-oxygen gas.

Images