KR101488432B1 - No back fire gas cutting torch - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0002] The present invention relates to an anti-backlash gas cutting machine for heating a material to be processed by a preheating flame and ejecting cutting oxygen to cut the material to be processed.
According to the present invention, a branch portion is formed in the valve bundle so that oxygen is branched into cutoff oxygen and preheated oxygen to flow respectively into the nozzle bundle. The nozzle bundle includes a tip having a tip at a tip end thereof, A preheating oxygen flow path from the valve bundle and an ejecting flow channel in which the fuel gas flows to the tip and a preheating oxygen flow flowing into the ejecting flow channel are increased so that the fuel gas flows through the ejecting flow channel A cut-off oxygen inflow hole connected to the cut-off oxygen flow path and an inflow hole connected to the ejecting flow channel are formed at the rear end of the tip, respectively, and a tip of the mixed gas inflow hole So that the preheated oxygen and the fuel gas flow into a vortex so that a combustible mixture gas is generated. Wherein one end of the aligning tube is fixed to either one of the ejecting channel of the head frame or the mixed gas inflow hole of the tip and the exposed end of the aligning tube is connected to the other end And the center of the injecting flow path and the center of the mixed gas inflow hole coincide with each other.

Description

BACK BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a gas-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas cutting machine, and more particularly, to a gas cutting machine that heats a workpiece with a preheating flame and ejects cutting oxygen to cut the workpiece.

The cutter of the gas cutting machine is generally constructed so that cutting oxygen is injected into the center thereof and a preheating flame for preheating the material to be cut around the cutter is formed. The preheating flame is formed by causing the mixed gas generated by mixing the gaseous oxygen and the fuel gas supplied to the gas cutter to be ignited.

Conventional gas-cutting machines use a torch mixing method and a nozzle (kiln) mixing method according to a method of mixing oxygen and fuel gas to form a preheating flame. For this, a 1-type cutter and a 3-type cutter according to KS B4601 .

Here, a type 1 cutter according to the KS B4601 standard, which is a torch mixing method, is a system in which oxygen and fuel gas are mixed in a valve bundle provided with a handle, and then a mixed gas is supplied to the furnace.

The gas cutting machine of the torch mixing type has a high possibility of flame inflow into the valve bundle in which the mixed gas is generated when back fire occurs, The flame may cause the valve bundle to heat up, resulting in burns of the operator, shortening the life of the valve bundle, and possibly causing the fuel gas pipe or the fuel gas container to rupture due to the pressure rise inside the valve bundle. .

On the other hand, the 3-type cutter according to the KS B4601 standard, which is a nozzle mixing method, is a method in which oxygen and fuel gas supplied through a valve bundle reach a nozzle through a separate path and mixed in a nozzle to generate a mixed gas.

The nozzle-mixing type gas-cutting machine has the advantage of reducing the possibility of backfire, but it is difficult to stably supply the fuel gas of relatively low pressure than oxygen, so that it may take a long time to preheat the material to be processed There are disadvantages. To compensate for this, increasing the pressure of the fuel gas increases the risk of accidents when backfire occurs.

In order to solve the disadvantages of the torch mixing method and the nozzle mixing method as described above, the present applicant has proposed a mixing method in which a mixed gas is generated through the prior art (Korean Patent Laid-Open Publication No. 10-2011-0041343) Quot; torch head " which is a so-called head mixing system disposed in the head of the gas cutting machine.

Since the head mixing method according to the prior art is arranged in the mixing part head, the occurrence of backfire is minimized, and even if backfire occurs, the explosive force is considerably lowered so that accident or noise is minimized. In the mixing part, The fuel gas is supplied stably by applying the injector method in which the fuel gas is sucked in accordance with the injection of the high-pressure preheated oxygen, thereby shortening the preheating time of the material to be processed.

However, in the gas cutting apparatus using the head mixing method according to the prior art, since oxygen and gas are partially mixed in the head to allow the mixed gas to pass through the head, when the mixed gas pressure in the tip portion and the mixed gas pressure in the head are generated There is a problem that backfire phenomenon occurs.

Also, even in the case of a general torch, a back pressure is frequently generated after the oxygen and gas injected from the injecting part are mixed with each other to reach the tip of the tip, so that backflushing frequently occurs.

In the prior art, the tip and the mixed gas injection holes formed in the head are aligned so as to communicate with each other, and then they are coupled by the nut. However, since there is no means for facilitating the operation of making the mixed gas injection holes coincide with each other, , But there is a drawback in that it is not easy for an expert to easily match the mixed gas injection holes.

Further, since the facing surfaces of the head and the tip are in close contact with each other due to the tightening force of the nut, even if the two mixed gas injection holes are precisely matched to each other and used for a long time, the nut is finely loosened, The mixed gas injection holes are displaced so that the supply of the mixed gas is not smooth, and if a fine gap is formed between the contact surfaces of the head and the tip, airtightness between the mixed gas injection hole and the cut oxygen hole can not be maintained There is a problem that backfire occurs.

Korean Patent Laid-Open Publication No. 10-2011-0041343 (title of the invention: head of torch, publication date: April 21, 2011)

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to prevent the backflow by minimizing the pressure difference of the mixed gas passage after the preheating oxygen and the combustion gas are laminarly moved in the injecting part, Even if backflushing occurs, the flame can not reach the head. Even if the head is heated, the hermetically sealed state of the ejecting portion can be maintained, and the structure of the head can be simplified to save time and cost in manufacturing, The present invention is to provide an anti-backlash gas cutting machine capable of increasing thermal efficiency and minimizing heating of the head, thereby prolonging the service life.

It is another object of the present invention to provide a method of assembling a nozzle head for a head frame, in which an injection channel provided in a head frame and a mixed gas inflow hole provided in a tip communicate with each other, And to provide a back-flushing gas cutter which can be produced.

It is a further object of the present invention to provide a head frame which can prevent the tip from flowing to the head frame even when used for a long time, And to prevent a mixed gas flowing in the gas flow path and the cut oxygen flow path from being mixed with the cut oxygen.

When the tip of the tip is clogged and the pressure changes in the mixed gas passage, the flow of the mixed gas due to the pressure difference is changed. When the tip of the tip moves to the side where the pressure changes, Backfire occurs in the gas. To minimize backfire, one of the best ways to reduce backfire is to reduce the pressure change as much as possible while the preheated oxygen and fuel gas are mixed and moving to the tip of the tip.

The preheating oxygen and fuel gas in the structure of the gas cutting machine are supplied along the pipe up to a certain section and are mixed with the preheating oxygen and the fuel gas at the position where the fuel gas is mixed, Tip mixing method which is mixed at tip.

An object of the present invention is to minimize the structural pressure change in a moving path of mixed gas in which oxygen and gas are mixed in the mixing methods.

In order to accomplish this purpose, it is necessary to move the oil layer between the oxygen and the gas by increasing the injection speed of the oxygen in the ejecting section until the first gas and oxygen are mixed. It is important to maintain the oil layer between the oxygen and the gas in the injection section because the oxygen and gas can not maintain the oil layer in the ejecting section and may be backfired to the injecting portion when mixed. In general, when the flame is backfired, oxygen and gas are mixed, and when the flame is injected separately, it is possible to minimize backfire to that portion.

In the second injection interval, oxygen and gas are injected into the oil layer to minimize the change in pressure until the oxygen and gas injected subsequently are mixed and the mixed gas is injected to the tip of the tip. have.

In the third injection section, the injection speed of oxygen is increased to form a layer between oxygen and gas, and at the same time, the amount of gas injected is increased to increase the thermal power, thereby improving the efficiency of the gas cutting machine.

Fourth, the purpose is to maintain airtightness in the passage through which the oxygen and gas injected in the oil layer reach the mixing chamber in the ejecting section, thereby minimizing the pressure change.

In order to accomplish the above object, the present invention provides a gas cutting machine having a valve bundle in which gaseous oxygen and fuel gas flow respectively, and a nozzle bundle coupled to the valve bundle and having an etched hole, And a head frame having a tip formed with a cutter at a tip end thereof and a head frame coupled to the tip, wherein the tip of the nozzle is connected to the tip of the nozzle, A cutoff oxygen flow path through which the cut oxygen introduced from the valve bundle flows into the tip, an ejecting flow channel through which the preheated oxygen and the fuel gas introduced from the valve bundle flow into the tip, To increase the flow rate of the preheated oxygen so that the fuel gas flows laminar flow through the ejecting channel A cut oxygen inflow hole communicating with the cutoff oxygen flow path and an inflow hole communicating with the ejecting flow channel are formed at the rear end of the tip, and the tip is laminarly flowed from the inflow hole into the tip, A mixed chamber having a cross sectional area wider than that of the inflow hole is formed so that the preheated oxygen and the fuel gas flow into a vortex so that a flammable mixture gas is generated, An end of an alignment tube through which oxygen and a gas are supplied is fixed to either one of the head frame and the tip, and when the head frame and the tip are coupled to each other, the exposed end of the alignment tube is fitted to the other of the ejecting channels or the mixed gas inflow hole, And the center of the mixed gas inflow hole of the tip is made to coincide with the center of the injecting flow path of the tip.

The alignment tube is fixed to the ejecting channel of the head frame, and the inner diameter of the ejecting channel and the inner diameter of the aligning tube are set to be the same, and the packing is fitted to the outer circumference of the aligning tube, And the tip is formed with a packing groove into which the packing is inserted.

According to the present invention having such a characteristic configuration, a flammable mixed gas in which preheated oxygen and fuel gas are mixed is generated in the tip, thereby minimizing the pressure difference of the mixed gas by the short flow path in the tip, As a result, the life of the torch, including the tip and head, can be extended and the safety of the operator can be maintained.

According to the present invention, by disposing the ejecting portion in the head, it is possible to minimize the possibility of occurrence of an accident caused by the decline of the thermal power due to lack of fuel gas and the backfire, and at the same time, the thermal power can be improved, And cost savings.

The present invention is characterized in that an alignment tube through which oxygen and gas flow is fitted between and fixed to the injecting flow path of the head frame and the mixed gas inlet hole of the tip to thereby match the mixing flow path and the mixed gas inlet hole It is possible to perform the operation very quickly and conveniently even if it is unskilled, and it is possible to prevent the flow of the tip and prevent the jetting flow path and the mixed gas inflow hole from being shifted from each other, .

According to the present invention, there is provided a packing which is fitted on an outer periphery of an alignment pipe, and a packing groove into which the packing is inserted is formed on a mixed gas inflow hole of the tip, The airtightness between the head frame or the tip can be maintained and even if a minute gap is formed between the head frame and the tip due to the long use, the packing keeps the airtightness between the cut- .

1 is a front view of a gas cutter according to a first embodiment of the present invention;
Fig. 2 is a cross-sectional view of the valve bundle of the gas cutter shown in Fig. 1
Fig. 3A is a cross-sectional view of the head of the gas cutter shown in Fig.
3B is a detailed enlarged view of the portion "A" shown in FIG. 3A
Fig. 4 is an exploded cross-sectional view of the head shown in Fig.
FIG. 5 is an exploded perspective view of the tip shown in FIG.
Fig. 6 is a view of the crater section viewed from the direction indicated by VI in Fig.
Fig. 7 is a rear end view of the inner tip viewed in the direction indicated by VII in Fig. 5
Fig. 8 is a front view of the head frame shown in Fig.
9 is an exploded cross-sectional view of the head of the gas cutting machine according to the second embodiment of the present invention
10 is a rear end view of the tip shown in Fig. 9
11 is a cross-sectional view of a head frame of a gas cutter according to a third embodiment of the present invention
12 is a cross-sectional view of a head frame of a gas cutter according to a fourth embodiment of the present invention

The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated and described in the drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a gas cutter according to a first embodiment of the present invention. Referring to FIG. 1, a gas cutter 1 according to an embodiment of the present invention includes a valve bundle 2 and a nozzle bundle 3.

The valve assembly 2 includes a supply port frame 21, a grip portion 22, and a valve frame 23 in which the oxygen and fuel gas flow in a gaseous state. The nozzle bundle (3) includes a head (35) and a neck (31) connected to the head (35).

The head 35 includes a tip 300 having a tip end (349 of FIG. 3A) formed at its tip and a fastening member 310 for coupling the tip 300 to the head frame 320. The neck 31 includes a fuel gas pipe 32, a preheated oxygen pipe 33, and a cut oxygen pipe 34. The neck 31 connects the head frame 320 and the valve frame 23.

The tip 300 having the cutter 349 shown in FIG. 3A is likely to be adhered with foreign matter such as metal oxide which is scattered while a lot of heat is applied during the cutting operation. Therefore, the life of the tip 300 is shorter than that of the head frame 320 . In addition, the thermal power required for the cutting operation may differ depending on the physical properties of the material to be cut (not shown). Accordingly, the tip 300 may be detachably coupled to the head frame 320 so that the tip 300 can be used as needed.

Fig. 2 shows a valve bundle cross-sectional view of the gas cutter shown in Fig. The valve bundle 2 will be described with reference to FIGS. 1 and 2. FIG.

A fuel gas supply port 211 and an oxygen supply port 213 for supplying fuel gas are formed in the supply port frame 21 constituting the valve assembly 2, A fuel gas control valve 25 is provided to control the inflow amount of the fuel gas. The rear end of the handle portion 22 is engaged with the supply port frame 21.

The handle (22) includes an outer tube (221) and an inner tube (222). The outer tube 221 is formed to have a shape that allows the user to easily grasp the outer circumferential surface when using the gas cutter 1. The space formed inside the outer tube 221 is connected to the fuel gas supply port 211. The inner pipe 222 is disposed in a space formed inside the outer pipe 221. The rear end of the inner pipe 222 is coupled to the supply port frame 21 and connected to the oxygen supply port 213. [

Therefore, when the fuel gas flows into the fuel gas supply port 211, the fuel gas flows into the fuel gas supply port 211, which is formed in the space between the inner circumferential surface of the outer tube 222 and the outer circumferential surface of the outer tube 221, Oxygen flowing through the flow path 224 and flowing into the oxygen supply port 213 flows through the oxygen flow path 223 formed in the inner pipe 222.

The distal end portion of the handle portion 22 is engaged with the valve frame 23. As shown in the figure, a passage through which oxygen flows from the handle portion 22 is formed in the valve frame 23. The oxygen flow channel 223 is branched into branch oxygen and preheated oxygen, (231) are formed.

The oxygen flowing into the valve frame 23 through the oxygen flow path 223 branches at the branching portion 231 and flows into the cut oxygen pipe 34 and the preheated oxygen pipe 33 respectively. A cutoff oxygen control valve 27 is provided at a portion of the valve frame 23 where the branched portion 231 is formed to control the amount of cutoff oxygen introduced into the cutoff oxygen pipe 34, The oxygen flow path is provided with a preheating oxygen control valve 26 for regulating the amount of preheated oxygen introduced into the preheated oxygen pipe 34.

Therefore, by regulating the fuel gas control valve 25, the preheating oxygen control valve 26 and the cutoff oxygen control valve 27, respectively, it is possible to control the fuel gas flow rate through the fuel gas pipe 32, the preheated oxygen pipe 33, The amount of flowing fuel gas, preheated oxygen, and cut oxygen can be controlled.

The fuel gas, the preheated oxygen, and the cut oxygen flow into the head frame 320 through the neck 31, which will be described with reference to Figs. 3A to 8.

For reference, the valve assembly 2 described above may be modified to have a structure different from that described above as long as fuel gas, preheated oxygen, and cut oxygen are supplied to the head frame 320, respectively.

Figure 3a shows a cross-sectional view of the gas cutter head shown in Figure 1, Figure 3b shows a detail enlarged view of the "A" part shown in Figure 3a, Are shown.

3A, 3B and 4, the head frame 320 is provided with a fuel gas flow path 324 connected to the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34, A flow path 325 and a cutoff oxygen flow path 326 are formed.

Therefore, the fuel gas, the preheated oxygen, and the cut oxygen introduced from the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 are supplied to the fuel gas flow path 324, the preheated oxygen flow path 325, And flows through the flow path 326, respectively.

The insertion hole 311 is formed through the fastening member (310 in FIG. 3A, FIG. 4), and a threaded portion 312 is formed on the inner peripheral surface thereof. The threaded portion 322 of the head frame 320 is formed in a shape corresponding to the threaded portion 312 of the fastening member 310. The threaded portion 322 of the head frame 320 is formed on the outer peripheral surface of the distal end portion of the head frame 320.

3A and 4, the rear end of the tip 300 may be formed into a shape embedded in the distal end of the head frame 320. As shown in FIGS. 3A and 4, the fastening member 310 may be fastened to the head frame 320, And is fixed by the fastening member 310 after it is seated in the seating groove 321. The threaded portion 312 of the fastening member 310 and the threaded portion 322 of the head frame 320 are fastened to each other to form a fastening portion 313.

When the tip 300 is coupled to the head frame 320 by the fastening member 310, the tip 300 penetrates through the insertion hole 311 and protrudes toward the distal end of the fastening member 310. The tip 300 includes an outer tip 330 and an inner tip 340 that are disposed in a space formed within the outer tip 330 so that the interior of the tip 300, A cut-off oxygen flow path 345 and a mixed gas flow path 333 are formed.

5, an exploded perspective view of the tip shown in FIG. 3A is shown. Referring to FIG. 5, a flange portion 331 having an expanded diameter is formed at the rear end of the outer tip 330, A flange portion 341 having an expanded diameter is also formed at the rear end of the flange portion 340.

The flange portion 341 of the inner tip 340 and the flange portion 331 of the outer tip 330 are formed to have corresponding outer diameters and the flange portion 341 of the inner tip 340 is formed in the seating groove 321 And is formed to have a corresponding shape.

3A, when the tip 300 is fixed to the head frame 320 by the fastening member 310, the flange portion 341 of the inner tip 340 is seated in the seating groove 321 And the flange portion 331 of the outer tip 330 is pressed by the fastening member 310 while overlapping the flange portion 341 of the inner tip 340. [

As shown in Fig. 5, the outer diameter of the outer tip 330 and the outer diameter of the inner tip 340 have a shape decreasing in the direction of the tip end. A cut oxygen passage 345 is formed in the inner tip 340 so as to penetrate the distal end portion from the rear end and a tip end of the cut oxygen passage 345 forms a cutoff oxygen injection hole 346.

A plurality of slits 344 arranged radially around the cutoff oxygen injection port 346 are formed on the outer circumferential surface of the portion where the outer diameter of the inner tip 340 is reduced. A through hole 332 is formed at the distal end of the outer tip 330. When the inner tip 340 is inserted into the outer tip 330, 332).

Here, the outer diameter of the reduced outer diameter portion of the inner tip 340 is formed to correspond to the inner diameter of the through hole 332 of the outer tip 330.

The outer diameter of the middle portion of the inner tip 340 is formed to be smaller than the inner diameter of the middle portion of the outer tip 330. [ 3A, when the inner tip 340 is inserted into the outer tip 330, a mixed gas flow path 333 is formed between the outer peripheral surface of the inner tip 340 and the inner peripheral surface of the outer tip 330 .

A mixed gas inflow hole 342 is formed in the flange portion 341 of the inner tip 340. At this time, when the rear end face of the flange portion 331 of the outer tip 330 comes into contact with the flange portion 341 of the inner tip 340, the front end of the mixed gas inflow hole 342 comes into contact with the flange portion 331 So that the rear end of the mixed gas flow path 333 is connected to the mixed gas inflow hole 342.

A mixed chamber is formed at the rear end of the mixed gas flow channel 333 and connected to the front end of the mixed gas inlet hole 342. The cross sectional area of the mixed chamber is larger than that of the mixed gas inlet hole 342. Here, the mixing chamber is not formed separately from the mixed gas flow path 333 but refers to a part of the rear end of the mixed gas flow path 333.

When the preheated oxygen and the fuel gas introduced into the mixed gas inflow hole 342 are introduced into the mixing chamber having a wide sectional area, the flow velocity is reduced and a vortex is formed. In this process, preheated oxygen and fuel gas are mixed, .

Thus, when the cut oxygen is supplied to the rear end center portion of the tip 300, the cut oxygen is injected into the cutoff oxygen injection port 346 through the cutoff oxygen flow path 345, and the preheated oxygen And the fuel gas generate a mixed gas while passing through the mixing chamber of the mixed gas flow path 333 and the mixed gas is injected into the through hole 332 through the slit 344 through the mixed gas flow path 333. This will be described with reference to FIG.

FIG. 6 shows the fire wall viewed from the direction indicated by VI in FIG. 3A. Referring to FIG. 6, a cut-off oxygen injection hole 346 and a mixed gas injection hole 347 are formed in the cutter 349, respectively.

As described above, the cutoff oxygen injection port 346 is disposed at the center of the inner tip 340, and the mixed gas ejection port 347 is disposed radially around the cutoff oxygen injection port 346.

The mixed gas injection port 347 is formed by a slit (344 in FIG. 5). The mixed gas injection port 347 is filled with a mixed gas injected into the mixed gas injection port 347 to sufficiently heat the material to be processed. Cutting of the material to be processed can be performed while the cutting oxygen is sprayed.

Referring again to FIGS. 3A and 4, the cross-sectional area of the mixed gas flow path 333 may be differently formed as required. However, in the first embodiment of the present invention, the cross- The cross-sectional area decreases again.

As a result, sufficient vortex is generated in the process of flowing the preheated oxygen and the fuel gas introduced from the mixed gas inflow hole 342 into the mixing chamber having a wide cross-sectional area so that the mixing ratio is improved. Thereafter, as the mixed gas is injected into the mixed gas injection port 347, So that the mixed gas is injected from the crater 349 at a sufficient flow rate and is prevented from backfiring in the process.

Fig. 7 shows the rear end of the inner tip viewed in the direction indicated by VII in Fig. 7, a rear end portion of the cutoff oxygen flow path 345 is disposed at the center rear portion of the flange portion 341 of the inner tip 340, and a mixed gas inflow hole 342 is disposed at an edge portion thereof.

That is, as described above, in order to inject the cutting oxygen into the cutoff oxygen injection port 346 and inject the mixed gas into the mixed gas injection port 347, cut oxygen must be supplied to the cutoff oxygen flow path 345, The preheated oxygen and the fuel gas must be introduced into the second heat exchanger 342.

Therefore, the seating groove (321 in Fig. 4) formed at the tip of the head frame 420, which is engaged with the rear end surface of the flange portion 341 of the inner tip 340, must also have a corresponding shape. This will be described with reference to FIG.

Fig. 8 shows a front end portion of the head frame shown in Fig. 3A. 8, the distal end of the cutting oxygen flow path 326 is disposed at the center of the seating groove (321 in Fig. 4) formed at the distal end of the head frame 320, and the distal end portion of the ejecting flow path 362 . Here, the ejecting channel 362 is formed at the center of the injecting cap 360, which will be described later.

7, when the rear end surface of the inner tip 340 is fixed to the seating groove 321 of the head frame 350, the cutting oxygen flow path 345 formed at the center portion of the inner tip 340, And a cut-off oxygen flow path 326 formed in the cutter 320 are connected to each other. That is, the cutoff oxygen that flows into the head frame 320 and flows through the cutoff oxygen flow path 326 is injected into the cutoff oxygen injection port (346 in FIG. 6) via the cutoff oxygen flow path 345 of the inner tip 340.

The preheating oxygen and the fuel gas flowing through the ejecting channel 362 flow through the mixed gas inlet hole 342 and are injected into the mixed gas injection hole 347 of FIG.

In the present embodiment, as shown in Figs. 3A to 5, the ejection of the head frame 320 can be performed by either one of the ejecting channel 362 of the head frame 320 or the mixed gas inflow hole 342, The alignment tube 370 is fitted to the mixed gas inflow hole 342 formed in the tip 300 when the tip 300 is coupled with the alignment tube 370 fixed on the flow path 362 side .

Therefore, the center of the injecting channel 362 and the center of the mixed gas inlet hole 342 are aligned with each other, and the inner diameter of the ejecting channel 362 and the inner diameter of the aligning pipe 370 can be set to be the same.

In contrast, although not shown, the alignment tube 370 is fixed to the mixed gas inflow hole 342 of the tip 300, and the alignment tube 370 is fixed to the tip 320 at the time of coupling with the head frame 320. [ The injecting flow path 362 and the mixed gas inflow hole 342 may be arranged to coincide with each other.

The packing 371 is inserted into the inner tip 340 of the tip 300 so that the packing 371 is inserted into the packing 371. So that the airtightness between the alignment tube 370 and the inner tip 340 can be maintained while the head frame 320 and the tip 300 are coupled with each other.

Therefore, it is possible to prevent the mixed gas flowing into the mixed gas flow path 333 and the cut oxygen flowing into the cut oxygen flow path 345 from being mixed with each other by the packing 371.

3A and 4, the internal structure of the head frame 320 will be described. In the head frame 320, a fuel gas and preheated oxygen are mixed to form an ejecting portion for generating a mixed gas. The injecting portion is formed by a fuel gas chamber 327 formed at an end of the fuel gas flow path 324, an ejecting core 350 installed in the fuel gas chamber 327, and an injection cap 360.

The ejecting core 350 has a cylindrical outer circumferential surface, and a preheated oxygen flow path 352 is formed along the longitudinal direction at the center. The preheating oxygen passage 352 is formed to penetrate from the front end to the rear end of the ejecting core 350 and connected to the preheating oxygen injection hole 353 formed at the tip of the ejecting core 350. The preheating oxygen spray hole 353 may be formed to have a smaller diameter than the preheated oxygen passage 352. The operation of the preheating oxygen injection hole 353 will be described below again.

A tapered surface 351 is formed on the outer side of the front end of the ejecting core 350. The tapered surface 351 is formed such that the outer diameter of the injecting core 350 decreases toward the tip of the ejecting core 350.

At the rear end of the ejecting core 350, unillustrated threads are formed. The threaded portion is coupled between the fuel gas flow path 324 of the head frame 320 and the preheated oxygen flow path 325 to form a fastening portion 354 as shown in the figure. That is, the ejecting core 350 is coupled to the inner circumferential surface of the through hole formed in a shape connecting the fuel gas flow path 324 and the preheating oxygen flow path 325 of the head frame 320.

Meanwhile, as described above, the injection cap 360 is spaced apart from the front end of the tip portion of the ejecting core 350 where the tapered surface 351 is formed.

The injection cap 360 has a shape corresponding to the tapered surface 351 formed at the distal end of the head frame 320. That is, a tapered surface 361 is formed at the rear end of the injection cap 360, and the tapered surface 361 has a shape embedded in the tip direction.

The ejecting core 350 and the injecting cap 360 are formed such that a part of the portion where the tapered surface 351 of the ejecting core 350 is formed is inserted into the portion where the tapered surface 361 of the injecting cap 360 is formed .

Meanwhile, an ejecting channel 362 is formed in the central portion of the injecting cap 360 so as to extend from the leading end to the trailing end along the longitudinal direction. 8, the rear end portion of the ejecting flow path 362 is disposed in the mounting groove 321 of the head frame 320, and the rear end portion of the ejecting flow path 362 is preheated And is disposed in parallel with the oxygen injection hole 353.

The ejecting cap 360 can be engaged with the head frame 320 in such a manner that the ejecting cap 360 is inserted into the through hole formed in the seating groove 321 of the head frame 320. [ At this time, although not shown, the injecting cap 360 may be coupled to the head frame 320 by welding or the like.

As previously described, the ejecting core 350 and the injecting cap 360 are spaced apart. Therefore, a gap is formed between the tapered surface 351 of the ejecting core 350 and the tapered surface 361 of the injecting cap 360, and this gap is connected to the fuel gas chamber 327.

The preheating oxygen passage 352 formed at the center of the ejecting core 350 is connected to the preheating oxygen passage 325 formed in the head frame 320 at the rear end of the ejecting core 350. Therefore, the preheated oxygen introduced through the preheating oxygen passage 325 flows into the rear end of the ejecting core 350 and is injected into the preheated oxygen injection hole 353 through the preheating oxygen passage 352.

The preheated oxygen injected into the preheating oxygen injection hole 353 flows into the injecting cap 360. The preheating oxygen injection hole 353 formed in the ejecting core 350 has an inner diameter smaller than that of the preheating oxygen passage 352. This increases the flow rate of the preheated oxygen injected through the preheating oxygen injection hole 353 So that the effect of sucking the fuel gas in the fuel gas chamber 327 between the two tapered surfaces 351 and 361 is increased.

The tapered surface 351 of the ejecting core 350 and the tapered surface 361 of the injecting cap 360 are formed by the preheating oxygen which is injected at a high speed from the preheating oxygen injection hole 353 and flows into the ejecting flow path 362 The fuel gas introduced into the fuel gas chamber 327 through the fuel gas flow path 324 flows through the two tapered surfaces 351 and 361 to the injecting flow path 362 Lt; / RTI >

The fuel gas chamber 327 is formed in a shape that surrounds a part of the ejecting core 350 from the outer circumferential surface of the ejecting core 350, as shown, away from the portion where the tapered surface 351 is not formed. The volume of the fuel gas chamber 327 is formed to a size such that a proper amount of the fuel gas can be mixed into the mixed gas in consideration of the thermal power required in the furnace (349 in FIG. 6).

That is, the volume of the fuel gas chamber 327 may be formed so that the volume of the fuel gas chamber 327 may be increased or decreased as needed, so that the shape of the cutoff oxygen flow path 326 may be changed. This will be described below with reference to FIG.

As described above, the preheating oxygen and the fuel gas flowing into the ejecting flow channel 362 are subjected to laminar flow in the process of passing through the ejecting flow channel 362 and the alignment pipe 370 connected thereto.

In the 'laminar flow' herein, the preheating oxygen and the fuel gas flow through the duct formed by the ejecting channel 362 and the aligning pipe 370, the preheated oxygen flows at the center thereof, Refers to that the fuel gas flows and forms a layered structure without mixing with each other and flows.

When the laminar flow preheated oxygen and fuel gas reach the mixing chamber having a wide cross-sectional area in the course of flowing into the mixed gas flow path 333 through the alignment pipe 370, the flow velocity is rapidly reduced and vortices are formed and mixed with each other. At this time, the larger the difference between the cross-sectional area of the aligning pipe 370 and the cross-sectional area of the mixing chamber, the greater the effect of generating the vortex. Accordingly, the mixing ratio of the preheated oxygen and the fuel gas is increased, The thermal efficiency of the mixed gas is increased.

Accordingly, the gas cutting device 1 according to the first embodiment of the present invention (as shown in FIG. 1) can prevent the flame from entering the alignment tube 370) and reaches the mixing chamber, that is, the flame reaches the range indicated by BF in FIG. 3A, so that it is very unlikely that an accident such as explosion due to backfire or overheating of the head frame 320 is caused Effect can be obtained.

For reference, partial mixing occurs at the interface between the preheated oxygen and the fuel gas flowing in the layered structure, and a trace amount of the mixed gas may be generated. However, when only a slight amount of the mixed gas is generated, 370). ≪ / RTI >

That is, the 'laminar flow' in the present specification means that the flame does not have sufficient flammability even if a part is mixed during the flow of the preheated oxygen and the fuel gas, and flows while maintaining the layered structure so that the flame does not flow into the alignment pipe 370 .

For this, the length of the ejecting channel 362 and the alignment pipe 370 may be formed to have a length enough to maintain the laminar flow, and as shown in the drawing, the ejecting core 350 having the preheating oxygen channel 352 formed therein, The injecting flow path 362, the inflow hole 342, and the mixing chamber may be arranged in a line.

Although not shown, a diffuser portion having a shape in which the diameter of the front end of the aligning pipe 370, that is, the portion of the aligning pipe 370 that is in contact with the mixing chamber is increased toward the pipe (349 in FIG. 3A) It is possible to control the degree to which the vortex is generated during the flow of oxygen and fuel gas into the mixing chamber.

On the other hand, the gas cutter 1 according to the first embodiment of the present invention sucks the fuel gas in the fuel gas chamber 327 into the ejecting flow path 362 by the high-speed injection of the preheating oxygen having a relatively higher pressure than the fuel gas The fuel gas is stably supplied unlike the system which depends on the supply pressure of the fuel gas, so that a constant thermal power can be maintained.

Further, since the ejecting flow path 362 is disposed in the head frame 320, there is no possibility that a safety accident such as an explosion due to a flame is caused even if backflushing occurs during use.

As described above, the head frame 320 does not require a separate sealing member for preventing the fuel gas, the preheated oxygen, and the cut oxygen from mixing with each other. That is, since the fuel gas, the preheated oxygen, and the cut oxygen can be prevented from being arbitrarily mixed without using a sealing member made of an elastic material such as rubber, the head frame 320 is heated by backfire or the like, It is possible to obtain the effect that the mixing of the fuel gas, the preheating oxygen and the cutting oxygen due to the damage caused by the burning is not generated.

9 is an exploded cross-sectional view of a head portion of a gas cutter according to a second embodiment of the present invention. 9, a fuel gas flow path 424, a preheated oxygen flow path 425, and a cut-off oxygen flow path 425, which are connected to the fuel gas pipe 32, the preheated oxygen pipe 33, And an oxygen flow path 426 are formed.

Here, the valve bundle (not shown) including the preheated oxygen pipe 33 and the cut oxygen pipe 34 of the fuel gas pipe 32 has the same structure as the valve bundle 2 described with reference to Figs. 1 and 2 The description will be omitted.

The fuel gas, preheated oxygen, and cut oxygen introduced from the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 are supplied to the fuel gas flow path 424, the preheated oxygen flow path 425, (426).

An insertion hole 411 is formed through the fastening member 410, and a threaded portion 412 is formed on the inner peripheral surface of the fastening member 410. The threaded portion 422 of the head frame 420 is formed in a shape corresponding to the threaded portion 412 of the fastening member 410.

The tip 400 includes an outer tip 430 and an inner tip 440. The inner tip 440 is disposed in the space formed in the outer tip 430 so that the interior of the tip 400 has a double tube shape in which the cutoff oxygen flow path 445 and the mixed gas flow path 433 are formed.

The flange portion 431 formed in the outer tip 430 and the flange portion 441 formed in the inner tip 440 and the inflow hole 442 are formed in the flange portion of the outer tip 330 described with reference to Figs. 331 and the flange portion 441 and the inflow hole 442 of the inner tip 440 are the same in structure and operation and the fastening member 410 and the head frame 420 have the same fastening structure, The description of the first embodiment of the present invention will be omitted.

However, the second embodiment differs from the first embodiment in that the cooling channel 471b is formed in the flange portion 441 of the inner tip 440, .

A seating groove 421 in which the rear end of the inner tip 440 is seated is formed at the front end of the head frame 420 in which the threaded portion 422 is formed. The tip of the cutoff oxygen flow path 426 is disposed at the center of the seating groove 421 so that when the tip 400 is coupled to the head frame 420, Flows into the rear end portion of the cutoff oxygen flow path 445 formed in the front end portion and flows toward the front end portion.

(Not shown) is formed at the tip of the tip 400. Since the tip of the tip 400 has the same structure as that of the tip 349 shown in FIG. 6, the description will be omitted. Therefore, the cut oxygen that has flowed to the distal end of the cutoff oxygen flow path 445 is injected into the cutoff oxygen injection port (see 346 in FIG. 6) of the firebox formed at the tip of the tip 400. The cutting oxygen injection port of the tip 400 is disposed at the center of the firebox.

On the other hand, a plurality of mixed gas ejection openings (not shown, see 347 in FIG. 6) are radially arranged around the cutoff oxygen ejection openings (not shown) arranged at the center of the tip of the tip 400, The mixed gas flowing through the mixed gas flow path 433 is injected.

Thus, in order to inject the mixed gas into the mixing gas injection port of the fire wall formed at the tip of the tip 400, the mixed gas must flow into the inlet hole 442. The mounting groove 421 of the head frame 420 which is engaged with the rear end surface of the flange portion 441 of the inner tip 440 is provided with the inlet hole 442 when the flange portion 431 is seated in the mounting groove 421, An ejecting channel 462 is disposed at a position corresponding to the position of the rear end of the ejector 462.

The ejecting channel 462 is formed in a shape passing through the center of the injection cap 460 disposed at the tip end of the seating groove 421 of the frame 420 as shown in the figure. Since the injection cap 460 is formed in the same shape as the injection cap 360 described with reference to FIGS. 3A, 4 and 8, the description of the shape of the injection cap 460 is omitted. Here, the injecting cap 460 is included in the injecting portion formed in the head frame 420.

The injecting portion is formed in the head frame 420. The injecting portion is provided with a fuel gas chamber 427 formed at an end of the fuel gas flow path 424, an ejecting core 450 installed in the fuel gas chamber 427, (460).

The ejecting core 450 has a cylindrical outer circumferential surface, and the preheated oxygen flow path 452 is formed along the longitudinal direction at the central portion as described above. The preheating oxygen flow path 452 is formed so as to penetrate from the front end portion to the rear end portion of the ejecting core 450. The tip end portion of the preheating oxygen flow path 452 is located at a position where the flange portion 441 is seated in the seating groove 421 And is connected to the inflow hole 442.

A tapered surface is formed on the outer side of the front end of the ejecting core 450. Since the tapered surface 351 has the same shape as the tapered surface 351 described with reference to FIGS. 3A and 4, .

The rear end of the ejecting core 450 is disposed between the fuel gas passage 424 and the preheating oxygen passage 425 formed in the head frame 420. The ejecting core 450 is disposed so as to connect the fuel gas passage 424 and the preheating oxygen passage 425 of the head frame 420 and is integrally formed with the head frame 420.

As described above, the injection cap 460 described above is spaced apart from the front end of the front end of the ejecting core 450 having the tapered surface. A tapered surface is formed at the rear end of the injecting cap 460. The tapered surface has an inclined shape corresponding to the tapered surface formed at the tip of the ejecting core 450 toward the tip. The central portion of the tapered surface of the embedded shape of the injecting cap 460 is connected to the rear end of the ejecting passage 462.

Therefore, the ejecting core 450 and the injection cap 460 are disposed such that a part of the portion where the tapered surface of the ejecting core 450 is formed is inserted into the portion where the tapered surface of the injecting cap 460 is formed. The ejecting cap 460 may be coupled to the head frame 420 in a manner that the ejecting cap 460 is inserted into the through hole formed in the seating groove 421 of the head frame 420 and may be integrally formed with the head frame 420.

When the injecting cap 460 is integrally formed with the head frame 420, the front end portion and the rear end portion of the head frame 420 may be formed around the portion denoted by CL in the drawing, . Therefore, the manufacture of the head frame 420 can be made very simple.

Further, the head frame 420 does not require a separate sealing member to prevent the fuel gas, the preheated oxygen, and the cut oxygen from mixing with each other. That is, even when the head frame 420 is heated during the cutting operation, the effect that the fuel gas, the preheated oxygen, and the cut oxygen are mixed arbitrarily can be obtained.

On the other hand, as in the fuel gas chamber 327 described with reference to FIGS. 3A and 4, the fuel gas chamber 427 is formed by a low pressure formed by the flow of preheated oxygen injected at high speed through the ejecting channel 462 And is a space into which the fuel gas flows so as to flow into the ejecting flow path 462 together with the preheated oxygen to flow laminar.

The fuel gas chamber 427 of the present embodiment is formed so that its volume is smaller than the fuel gas chamber 327 of the first embodiment of the present invention (1 of FIG. 1) Taking into account the required thermal power in a crater (not shown), a proper amount of the fuel gas is formed into a size capable of being mixed into the mixed gas.

As described above, the volume of the fuel gas chamber 427 can be formed so as to be increased or decreased as needed, so that the shape of the cut-off oxygen flow path 426 can be changed according to the cutoff oxygen flow path of the first embodiment (1) 3a and 327 of FIG. That is, the shape of the cutoff oxygen flow path 426 may be formed in a suitable shape according to needs, such as the volume of the fuel gas chamber 427.

Fig. 10 shows the rear end of the tip shown in Fig. Referring to FIGS. 9 and 10 together, a cooling passage 471 is formed in the rear end surface of the tip 400, that is, the rear end surface of the flange portion 441. The cooling channel 471 is formed in a groove shape through which cut oxygen flowing into the cutoff oxygen flow channel 445 of the tip 400 flows through the cutoff oxygen flow channel 426 of the head frame 420.

The cutoff oxygen flow path 445 may include a linear cooling flow path 471a and a curved cooling flow path 471b. Here, the linear cooling flow path 471a may be formed radially from the cutoff oxygen flow path 445 disposed at the center of the flange portion 441 toward the edge of the flange portion 441. The curved cooling passage 471b is formed along the rear edge of the flange portion 441 and may have a shape that connects the ends of the linear cooling passage 471a to each other as shown in the figure.

A part of the cutoff oxygen flows into the linear cooling flow path 471a and the curved cooling flow path 445 in the course of flowing the cutting oxygen into the cutting oxygen flow path 445 of the tip 400 from the cutting oxygen flow path 426 of the head frame 420. [ Can be flowed along the line 471b.

At this time, since the cutting oxygen is at a low temperature, when the cutting oxygen flows along the cooling channel 471, the rear end surface of the tip 400 in contact with the cutting oxygen and the tip end of the head frame 420 are cooled. That is, even when the tip 400 is heated by cutting or backfiring, the heat conducted through the tip 400 is cooled by the cutting oxygen flowing through the cooling channel 471, Can be greatly reduced.

The head frame 420, the fuel gas pipe 32, the preheated oxygen pipe 33, the cut oxygen pipe 34, and the like can be prevented from being heated during the operation, Can be suppressed.

As a material of the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34, a copper alloy is used to prevent oxidation due to heating. The cooling of the cooling channel 471 It is possible to replace the material of the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34 with a material which is cheaper than the copper alloy and has excellent mechanical strength and is light in weight, Can be obtained.

On the other hand, as in the first embodiment described above, any one of the jetting passage 462 of the head frame 420 or the mixed gas inlet hole 442, that is, The alignment tube 470 is fitted into the mixed gas inlet hole 442 formed in the tip 400 at the time of coupling with the tip 400 while the alignment tube 470 is fixed to the side of the ejecting channel 462 .

Therefore, the center of the injecting flow channel 462 and the center of the mixed gas inlet hole 442 coincide with each other, and the inner diameter of the ejecting flow channel 462 and the inner diameter of the aligning pipe 470 can be set to be the same.

A packing 472 is inserted into the inner tip 440 of the tip 400 so that the packing 472 is inserted into the packing groove 474 So that the airtightness between the alignment tube 470 and the inner tip 440 can be maintained while the head frame 420 and the tip 400 are coupled to each other.

Therefore, it is possible to prevent the mixed gas flowing into the mixed gas flow path 433 and the cut oxygen flowing into the cut oxygen flow path 445 from being mixed with each other by the packing 472, and the same effects as those of the first embodiment Can be obtained.

11 shows a head frame cross-sectional view of a gas cutter according to a third embodiment of the present invention. 11, a fuel gas flow path 524, a preheating oxygen flow path 525, and a cut-off oxygen flow path 524, which are respectively connected to the fuel gas pipe 32, the preheating oxygen pipe 33 and the cut oxygen pipe 34, And a flow path 526 are formed.

Here, the valve bundle of the gas cutter according to the third embodiment of the present invention not shown includes the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34, see FIGS. 1 and 2 The same structure as that of the valve assembly 2 described above can be applied, so that the description thereof will be omitted.

In addition, the gas cutting apparatus according to the third embodiment of the present invention, which is not shown, can be applied to any one of the aforementioned tips (300 in FIG. 3A and 400 in FIG. 9).

The head frame 520 is connected to a distributor insertion hole 528 which penetrates a part of the head frame 520 from the rear end to the front end portion while connecting the fuel gas passage 524, the preheating oxygen passage 525, And a distributor is inserted and connected to the distributor insertion hole 528. The distributor includes a distributor body 550.

The distributor body 550 is formed in a cylindrical shape, and a cutoff oxygen bypass groove 556 is formed on the outer peripheral surface of the distributor body 550. The cutoff oxygen bypass groove 556 is formed on the outer circumferential surface of the distributor main body 550. When the distributor main body 550 is inserted into the distributor insertion hole 528, (526).

The portion of the cutoff oxygen flow path 526 blocked by the distributor body 550 coupled to the distributor insertion hole 528 is connected through the cutoff oxygen bypass groove 556. Therefore, The cut oxygen can flow to the distal end of the cutoff oxygen flow path 526 through the cutoff oxygen bypass groove 556.

An ejecting core portion 555 is formed at the front end of the distributor main body 550. A tapered surface 551 is formed on the outer circumferential surface of the ejecting core portion 555 in such a manner that the outer diameter thereof decreases toward the front end of the distributor body 550.

A preheating oxygen inflow hole 554 is formed in a portion of the distributor main body 550 that is in the tip direction rather than the portion where the cutoff oxygen bypass groove 556 is formed and in the rear end direction than the portion where the tapered surface 551 is formed.

A plurality of preheating oxygen inflow holes 554 may be formed radially from the outer circumferential surface of the distributor body 550 to the center thereof. The preheating oxygen inflow hole 554 is formed at a position corresponding to the preheated oxygen flow path 525 in the outer peripheral surface of the distributor body 550 when the distributor body 550 is inserted into the distributor insertion hole 528 do.

On the other hand, a preheating oxygen passage 552 is formed in the center of the ejecting core portion 555. The preheating oxygen flow path 552 is formed to be connected to the preheating oxygen inflow hole 554 from the front end of the distributor body 550 along the center of the distributor body 550. In other words, the preheating oxygen passage 552 is connected to the tip of the distributor body 550 from a portion disposed at the center of the distributor body 550 of the preheating oxygen inflow hole 554.

Therefore, the preheated oxygen introduced into the preheating oxygen inflow hole 554 is injected to the tip of the distributor main body 550 via the preheated oxygen flow path 552.

The head frame 520 is formed with an ejecting cap portion 561 having a shape corresponding to the ejecting core portion 555 and spaced apart from the ejecting core portion 555 in the leading direction. An ejecting passage 562 is formed at the center of the ejecting cap portion 561 and a periphery of the ejecting passage 562 is formed in a shape corresponding to the shape of the tapered surface 551 of the ejecting core portion 555, A tapered surface having a shape embedded toward the front end of the head frame 520 is formed.

A fuel gas chamber 527 connected to the fuel gas passage 524 is formed around the ejecting core portion 555 so that the fuel gas introduced through the fuel gas pipe 32 passes through the fuel gas passage 524, And then flows into the chamber 527.

The preheated oxygen injected into the preheating oxygen injection hole 553 formed at the tip of the ejecting core portion 555 through the preheating oxygen flow path 552 flows into the ejecting flow path 562 and the tapered surface 551 ) Is relatively low. Therefore, the fuel gas in the fuel gas chamber 527 flows into the ejecting flow channel 562 together with the preheated oxygen, and the fuel gas and the preheated oxygen in the ejecting flow channel 562 undergo laminar flow as described above.

3a or 310 of FIG. 9) is received in the seating groove 521 formed in the front end of the head frame 520, and the rear end of the above- The tip 300 or 400 and the head frame 520 may be fixed to the threaded portion 522 formed at the tip of the head frame 520. [

As described above, in the third embodiment of the present invention, the ejecting portion can be formed by the ejecting core portion 555, the ejecting cap portion 561, and the fuel gas chamber 527 in the head frame 520.

The portion between the tapered surface 551 and the preheating oxygen inflow hole 554 in the outer peripheral surface of the distributor main body 550 and the portion between the preheating oxygen inflow hole 554 and the cutoff oxygen bypass groove 556, The portion between the detour groove 556 and the rear end of the distributor body 550 can be welded to the inner peripheral surface of the distributor insertion hole 528, respectively.

The welded joint as described above is welded to the portion between the tapered surface 551 and the preheated oxygen inflow hole 554 in the outer peripheral surface of the distributor main body 550 and the preheated oxygen inflow hole 554 and the cutoff oxygen bypass groove 556, Welding grooves 557a, 557b and 557c are formed in the portions between the cut-off oxygen bypass groove 556 and the rear end of the distributor body 550 and the ring grooves 557a, 557b and 557c are formed in the welding grooves 557a, (Not shown) or a welded material (not shown) in a powder state, and then heating this portion to weld a welding rod (not shown) or a welded material (not shown).

As such a welding method, a method such as ultrasonic welding or brazing can be used. The fuel gas, the preheated oxygen, and the cut oxygen can be prevented from arbitrarily mixing in the head frame 520 by the welded portions 558a, 558b, and 558c formed in the above manner, Even if the head frame 520 is heated by heat, damage due to the deterioration of the sealing member or the like described above does not occur, so that the head frame 520 can be used semi-permanently.

In particular, since the head frame 520 according to the present embodiment is very easy to process, the manufacturing cost of the head frame 520 can be saved. For reference, the operation effect on the alignment tube 570 is the same as that described with reference to FIG. 9, and thus description thereof is omitted.

12 is a sectional view of a head frame of a gas cutting machine according to a fourth embodiment of the present invention. 12, a fuel gas flow path 624, a preheated oxygen flow path 625, and a cut oxygen path 624, which are respectively connected to the fuel gas pipe 32, the preheating oxygen pipe 33, and the cut oxygen pipe 34 in the head frame 620, And a flow path 626 are respectively formed.

Here, the valve bundle of the gas cutter according to the fourth embodiment of the present invention not shown includes the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34, see FIGS. 1 and 2 The same structure as that of the valve assembly 2 described above can be applied, so that the description thereof will be omitted.

In addition, the gas cutting apparatus according to the fourth embodiment of the present invention, which is not shown, can be applied to any one of the aforementioned tips (300 in FIG. 3A and 400 in FIG. 9).

The head frame 620 includes an ejecting core 650, an inner cap 654 and an outer cap 655. A fuel gas flow path 624 and a preheating oxygen flow path 625 are connected to each other An ejecting core insertion hole 628 is formed. A cap inserting hole 629 is formed in the head frame 620 to connect the preheating oxygen flow path 625 and the cutoff oxygen flow path 626 to each other.

The ejecting core insertion hole 628 and the cap insertion hole 629 are connected to each other and the cap insertion hole 629 is formed to have a larger diameter than the ejecting core insertion hole 628. [

An ejecting core 650 is inserted into the ejecting core insertion hole 628. A tapered surface 651 is formed at the tip of the ejecting core 650. The tapered surface 651 is formed to have a reduced outer diameter toward the tip of the ejecting core 650.

The outer circumferential surface of the rear end portion of the ejecting core 650 is formed in a shape corresponding to the inner circumferential surface of the ejecting core insertion hole 628. The outer circumferential surface of the rear end portion of the ejecting core 650 is connected to the fuel gas passage 624, Is inserted into the ejecting core insertion hole 628 so as to be disposed in a shape blocking the gap between the projecting portions 625.

A preheating oxygen flow path 652 is formed in the ejecting core 650. The preheating oxygen flow path 652 is formed to penetrate the center portion of the ejecting core 650 from the rear end to the front end. A preheating oxygen spray hole 653 having a diameter smaller than that of the preheating oxygen passage 652 is formed at the tip of the preheating oxygen passage 652.

On the other hand, an inner cap 654 is inserted into the cap inserting hole 629. The outer surface of the inner cap 654 is formed to have a shape corresponding to the inner circumferential surface of the cap insertion hole 629. The inner cap 654 is disposed in such a shape as to block the space between the preheated oxygen passage 625 and the cut oxygen passage 626 in the cap inserting hole 629.

Therefore, the preheated oxygen introduced into the preheated oxygen flow path 625 is prevented from flowing into the cut oxygen flow path 626 by the inner cap 654. The outer cap 655 is coupled in a shape covering the cap insertion hole 629. [ The outer circumferential surface of the outer cap 655 is formed to have a shape corresponding to the inner circumferential surface of the rear end portion of the cap insertion hole 629 and the cut oxygen flowing in the cut oxygen passage 626 by the outer cap 655 is supplied to the head frame 620 ) To the outside.

Weld grooves 650a, 654a, and 655a are formed on the outer peripheral surface of the rear end portion of the ejecting core 650, the outer peripheral surface of the inner cap 654, and the outer surface of the outer cap 655, respectively. The welding grooves 650a, 654a and 655a are formed in an open shape in the rear end direction of the head frame 620 as shown in the figure.

Therefore, when the ejecting core 650, the inner cap 654, and the outer cap 655 are to be coupled to the head frame 620, the leading end of the head frame 620 is moved downward, that is, toward the gravity direction And then an ejecting core 650 is placed on the inside of the ejecting core insertion hole 628 and a ring shaped welding rod (not shown) or a powdered welding material (not shown) is attached to the welding groove 650a Is inserted.

Then, the inner cap 654 is inserted into the cap inserting hole 629. At this time, since the cap insertion hole 629 has a diameter larger than the ejecting core insertion hole 629, a step is formed between the ejecting core insertion hole 629 and the cap insertion hole 629, and the inner cap 654 May be supported by this step and disposed inside the cap inserting hole 629.

After the inner cap 654 is disposed, a ring-shaped welding rod (not shown) or a powdered welding material (not shown) is inserted into the welding groove 654a.

The outer circumferential surface of the outer cap 655 may be formed to be somewhat interference fit on the inner circumferential surface of the cap insertion hole 629. Therefore, when the outer cap 655 is inserted into the cap inserting hole 629, the outer cap 655 can be held in the correct position.

After the outer cap 655 is disposed at the position of the cap inserting hole 629, that is, at a position covering the cap inserting hole 629, a ring-shaped electrode (not shown) A welding material (not shown) is inserted.

Thereafter, a ring-shaped welding rod (not shown) inserted into the welding grooves 650a, 654a, 655a or a welding material (not shown) in a powder state is fused to the welding grooves 650a, 654a, 655a. Can be used.

The head frame 650, the ejecting core 650, the inner cap 654 and the outer cap 655 are welded to each other by welding (not shown) or a welding material (not shown) 650b, 654b, and 655b. Therefore, even if the head frame 620 is heated by the heat conducted from the tip (300 in FIG. 3A) due to the cutting operation or backfiring, damage caused by deterioration of the sealing member or the like described above does not occur. The fuel gas, the preheating oxygen, and the cutting oxygen may be prevented from being mixed arbitrarily, and the head frame 520 may be used semi-permanently.

Particularly, since the head frame 620 can be welded after the ejecting core 650, the inner cap 654 and the outer cap 655 are sequentially disposed in the head frame 620, The effect of facilitating manufacture can be obtained.

On the other hand, an ejecting cap portion 661 is formed on the tip end side of the portion of the inside of the head frame 620 where the ejecting core 650 is disposed. The ejecting cap portion 661 is spaced apart from the leading end of the ejecting core 650 in the direction of the front end of the head frame 620 and an ejecting passage 662 is formed at the center thereof.

The circumferential edge of the ejecting channel 662 is formed with a tapered surface having a shape embedded toward the front end of the head frame 520 toward the center so as to have a shape corresponding to the shape of the tapered surface 551 of the ejecting core 650.

A fuel gas chamber 627 connected to the fuel gas passage 624 is formed around the ejecting core portion 650 so that the fuel gas introduced through the fuel gas pipe 32 passes through the fuel gas passage 624, And enters the chamber 627.

The preheated oxygen injected into the preheating oxygen injection hole 653 at the front end of the ejecting core 650 through the preheating oxygen flow path 652 flows into the ejecting flow path 662 and accordingly the periphery of the tapered surface 651 The pressure is relatively low. Therefore, the fuel gas in the fuel gas chamber 627 flows into the ejecting flow channel 662 together with the preheated oxygen, and in the ejecting flow channel 662, the fuel gas and the preheated oxygen flow laminar as described above.

As described above, in the fourth embodiment of the present invention, the ejecting portion can be formed by the ejecting core portion 650, the ejecting cap portion 661, and the fuel gas chamber 627 in the head frame 620. For reference, the operation effect on the alignment tube 670 is the same as that described with reference to FIG. 9, and therefore, detailed description thereof will be omitted.

Although the gas cutter according to the embodiment of the present invention has been described above, the spirit of the present invention is not limited to the embodiments disclosed herein. Those skilled in the art will recognize that other embodiments may easily be suggested by adding, changing, deleting, or adding elements within the scope of the spirit of the present invention. will be.

1: gas cutter 2: valve bundle
3: nozzle bundle 32: fuel gas pipe
33: preheated oxygen tube 34: cut oxygen tube
35: Head 300: Tip
310: fastening member 320: head frame
324: fuel gas flow path 325: preheated oxygen flow path
326: Cutoff oxygen flow path 327: Fuel gas chamber
330: outer tip 331: flange portion
332: through hole 333: mixed gas flow path
340: inner tip 341: flange portion
342: mixed gas inflow hole 345: cut oxygen flow path
346: Cutting oxygen injection port 347: Mixed gas injection port
348: packing groove 350: injection core
353: Preheating oxygen sprayer 360: Injecting cap
362: Injecting channel 370: Alignment tube
371: Packing

Claims (3)

1. A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow respectively and a nozzle bundle coupled to the valve bundle,
Wherein the valve bundle has a flow path through which fuel gas containing cutting oxygen and preheated oxygen flows respectively,
Wherein the nozzle bundle includes a head frame having a tip and a tip,
A cut-off oxygen flow path through which the cut oxygen introduced from the valve bundle flows into the tip, an ejecting flow channel through which the preheated oxygen and the fuel gas introduced from the valve bundle flow into the tip, An injecting portion for increasing the flow rate of the preheated oxygen flowing into the injecting flow channel and laminarly flowing the fuel gas through the injecting flow channel,
And a cut-off oxygen inflow hole communicating with the cut-off oxygen flow path and an inflow hole communicating with the ejecting flow channel are formed at the rear end of the tip, and the tip is filled with the preheated oxygen flowing in from the inflow hole, A mixing chamber having a cross-sectional area wider than that of the inflow hole is formed so that the gas forms a vortex to generate a combustible gas mixture,
One end of the aligning tube is fixed to either the ejecting channel of the head frame or the mixed gas inlet hole of the tip, and the exposed end of the aligning tube when the head frame is coupled with the tip is connected to the other ejecting channel So that the center of the mixed gas inflow hole of the jetting channel of the head frame and the tip is made to coincide with each other. The anti-backlash gas cutter according to claim 1, wherein the alignment tube is fixed to an ejecting channel of a head frame, and an inner diameter of the ejecting channel and an inner diameter of the aligning pipe are set to be the same. The backfill gas cutter according to claim 1 or 2, wherein the alignment tube has a packing fitted around its periphery, and the tip has a packing groove into which the packing is inserted.

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