WO2015060692A1

WO2015060692A1 - Gas cutter

Info

Publication number: WO2015060692A1
Application number: PCT/KR2014/010084
Authority: WO
Inventors: 강의창; 이명희
Original assignee: 주식회사 불불; 강의창
Priority date: 2013-10-25
Filing date: 2014-10-24
Publication date: 2015-04-30

Abstract

The purpose of the present invention is to provide a head for a gas cutter which, due to minimizing a pressure change occurrence caused by a pressure difference in a mixed gas passageway, is capable of maintaining preheating performance by smoothly spraying mixed gas and stably forming a flame, and which is capable of maximally inhibiting backfire occurrence caused by a mixed gas pressure difference within the head. In addition, the purpose of the present invention is to provide a head for a gas cutter which allows even an unskilled person to very promptly and conveniently combine a head frame and a tip, which constitute the head, in such a manner that an injecting flow path provided to the head frame and the mixed gas passageway provided to the tip are in communication with each other, simultaneously allowing the laminar flow movement of preheated oxygen and fuel gas by efficiently configuring the injecting flow path of an injecting part, which is capable of preventing backfire by minimizing the pressure difference within the mixed gas passageway after the preheated oxygen and the fuel gas are mixed, and which is capable of extending the life span by minimizing the heating of the head as well as being capable of increasing heat efficiency by improving the mixing ratio of the mixed gas, without allowing the flame to reach the head even if a backfire occurs.

Description

Gas cutting machine

The present invention relates to a gas cutter, and more particularly, to minimize the change in pressure of the mixed gas that is pre-oxygen and fuel gas for heating the workpiece to be ejected to facilitate the ejection of the mixed gas and at the same time backfire The present invention relates to a gas cutting machine capable of suppressing phenomena as much as possible.

In general, the gas cutter head is configured such that the cutting oxygen is injected into the center of the tip constituting the head and a preheat flame is formed to preheat the workpiece around the cutting oxygen, and the preheating flame is a gas supplied to the tip. It is formed by allowing the mixed gas produced by mixing the oxygen and fuel gas in a state to ignite.

Conventional gas cutters use a torch mixing method and a nozzle mixing method according to a method of mixing oxygen and fuel gas in order to form a preheated flame, which is defined as a type 1 cutter and a type 3 cutter in the KS B4601 standard. have.

Here, the type 1 cutter of the KS B4601 standard, which is a torch mixing method, allows oxygen and fuel gas to be mixed in a valve bundle provided with a handle part, and then mixed gas is supplied to the crater.

The torch mixing gas cutting machine is highly likely to cause backfire during use because the flame can flow into the inside of the valve bundle where the mixed gas is generated when a back fire occurs, and when the backfire occurs, it flows inside the valve bundle. As the valve bundle is heated by the flame, the operator may be burned or the life of the valve bundle may be shortened, and the rise of the pressure inside the valve bundle may lead to an accident that the fuel gas pipe or the fuel gas container is ruptured. There are disadvantages.

In addition, the type 3 cutter of the KS B4601 standard nozzle mixing method is a way that oxygen and fuel gas supplied through the valve bundle is reached to the nozzle in a separate path, mixed in the nozzle to produce a mixed gas.

The nozzle mixing gas cutting machine has the advantage of lowering the possibility of backfire, while it is difficult to stably supply fuel gas at a lower pressure than oxygen, which may take a long time to preheat the workpiece. In addition, when the pressure of the fuel gas is increased, there is a disadvantage that the risk of an accident when the backfire occurs increases.

In order to solve the shortcomings of the torch mixing method and the nozzle mixing method as described above, the mixing unit in which the mixed gas is generated through the Republic of Korea Patent Publication No. 10-2011-0041343 (hereinafter referred to as "prior art") of the gas cutting machine The head of the torch, a so-called head mixing method disposed in the head, has been proposed.

That is, as shown in FIG. 1, the gas cutter 1 includes a valve bundle 2 and a nozzle bundle 3 connected thereto. The valve bundle 2 is a portion into which oxygen and fuel gas in a gaseous state are introduced, and includes a supply port frame 21, a handle part 22, and a valve frame 23. Moreover, the nozzle bundle 3 is provided with the head 30 and the neck 31 which connects this head 30 to the valve bundle 2. Head 30 is composed of a tip 400 and the head frame 300 and the fastening member 500 for coupling the head frame 300 and the tip 400, the crater is formed at the tip. The neck 31 is composed of a fuel gas pipe 32, a preheated oxygen pipe 33, and a cut oxygen pipe 34. The neck 31 connects the head frame 300 and the valve frame 23 as shown.

2 shows a cross-sectional view of the valve bundle 2.

A fuel gas supply port 211 and an oxygen supply port 213 through which the fuel gas is supplied are formed in the supply port frame 21 constituting the valve bundle 2, and fuel gas through the fuel gas supply port 211. A fuel gas control valve 25 (see Fig. 1) that can adjust the flow rate of the is installed. One end of the handle portion 22 is coupled to the supply port frame 21. In addition, the handle portion 22 includes an exterior 221 and an inner tube 222. The exterior 221 is formed to have a shape in which the user can easily grip the outer circumferential surface when using the gas cutter 1. The space formed inside the exterior 221 is connected to the fuel gas supply port 211. The inner tube 222 is disposed in a space formed inside the outer 221, one end of the inner tube 222 is coupled to the supply port frame 21 and connected to the oxygen supply port 213.

Therefore, the handle portion 22 is a kind of double pipe shape, when the fuel gas flows into the fuel gas supply port 211, the fuel gas flow path formed in the space between the inner peripheral surface of the outer 221 and the outer peripheral surface of the inner tube 222 Oxygen flows through 224, and oxygen flowing into the oxygen supply port 213 flows through an oxygen passage 223 formed in the inner tube 222.

In addition, the other end of the handle 22 is coupled to the valve frame (23). As shown in the valve frame 23, a passage through which oxygen flowing from the handle 22 is formed is formed, and the oxygen flowing through the oxygen passage 223 is branched into the cutting oxygen and the preheated oxygen. Base 231 is formed.

Therefore, the oxygen flows into the valve frame 23 through the oxygen passage 223 is branched from the branch 231 is introduced into the cut oxygen pipe 34 and the preheated oxygen pipe 33, respectively. In the portion where the branch portion 231 of the valve frame 23 is formed, a cutting oxygen control valve 27 for adjusting the amount of cutting oxygen introduced into the cutting oxygen pipe 34 is installed, and the preheating formed in the valve frame 23 is performed. The preheated oxygen control valve 26 for adjusting the amount of preheated oxygen flowing into the preheated oxygen pipe 34 is provided in the flow path of oxygen.

Therefore, by adjusting the fuel gas control valve 25, the preheated oxygen control valve 26 and the cut oxygen control valve 27, respectively through the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34, respectively. The amount of fuel gas, preheated oxygen and cleaved oxygen flowing can be adjusted. Fuel gas, preheated oxygen and cut oxygen are introduced into the head frame 300 through the neck 31.

3 shows the configuration of the first example of the prior art of the head provided in the gas cutter in detail.

As shown, the head frame 300 in the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34, respectively connected to the fuel gas flow path 311, preheated oxygen flow path 312 and cutting An oxygen flow passage 313 is formed.

Therefore, 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 respectively a fuel gas flow path 311, a preheated oxygen flow path 312, and a cut oxygen flow path. Each flows through 313.

At this time, the mixed gas mixing unit provided in the head 30, the preheated oxygen discharge port of the injector 350 formed in the head frame 300 to the preheated oxygen introduced into the head frame 300 through the preheated oxygen flow path 312 The fuel is injected into the mixing space 351 through the 312a, and the fuel is in contact with the space formed around the injector 350 of the fuel gas introduced into the head frame 300 through the fuel gas flow path 311. The fuel gas and preheated oxygen are mixed in the mixing space 351 by ejecting the gas into the mixing space 351 through the gas outlet 311a.

On the other hand, the tip 400 is composed of the outer tip 430 and the inner tip 440, the inner tip 440 is disposed in the space formed in the outer tip 430, the inside of the tip 400 is cut oxygen passage 445 and the mixed gas passage 433 have a double tube shape.

In addition, by coupling the head frame 300 and the tip 400 by the fastening member 500, the mixing space portion 351 of the head frame 300 is connected to the mixed gas passage 433 of the tip 400 The cutting oxygen flow passage 313 of the head frame 300 is connected to the cutting oxygen passage 445 of the tip 400.

At this time, the tip 400 has an inner tip flange portion 440a for coupling with the head frame 300 at the upper end of the inner tip 440, the inner tip flange portion 440a of the head frame 300 A connection hole 440b connecting the mixing space 351 and the mixed gas passage 433 of the tip 400 is formed.

Therefore, the preheated oxygen and fuel gas are mixed in the mixing space 351 of the head frame 300, and the mixed gas mixed in the mixing space 351 is the outer tip through the connection hole 440b of the inner tip 440. 430 is introduced into the mixed gas passage 433 between the inner tip 440 and is discharged to the tip of the tip 400, the cutting oxygen is the inner tip through the cutting oxygen flow path 313 of the head frame 300 440 is introduced into the cutting oxygen passage 445 formed in the center and is discharged to the tip of the tip 400.

Accordingly, the workpiece is ignited by the mixed gas injected to the tip of the mixed gas passage 433, and the workpiece is sufficiently heated, and when the cutting oxygen is injected through the tip of the cut oxygen passage 445, the workpiece is removed. Oxidation can be done to cleavage.

In the prior art of the head mixing method, since the mixed gas mixing portion of the fuel gas and the preheated oxygen is disposed in the head frame, the occurrence of backfire is reduced, and the fuel portion is injected into the injecting portion by the preheating of the preheated oxygen, which is relatively higher than the fuel gas. By applying the injector method in which the suction of the fuel gas is stably supplied, there is an advantage that the preheating time of the workpiece is shortened.

However, the gas cutting machine according to the prior art has a cross sectional area size of the mixed gas passage 433 into which the mixed gas is introduced, rather than the cross sectional area of the mixing space 351 and the connection hole 440b where preheated oxygen and fuel gas are mixed. As it is formed to be about 10 times larger, a pressure difference occurs in a portion where the connection hole 440b of the inner tip 440 and the mixed gas passage 433 are connected, causing a problem of backfire.

As such, when a pressure change occurs due to a pressure difference in a passage through which the mixed gas flows, the injection of the mixed gas is not smooth and a stable flame cannot be formed during ignition, thus preheating performance is deteriorated, and the main causes of backfire. There is a problem that provides a cause.

In addition, even in the case of a general gas cutting machine, a pressure change occurs while reaching the tip of the tip after the preheated oxygen and fuel gas injected from the injecting unit are mixed, and thus, a backfire occurs frequently.

On the other hand, Figure 4 shows the configuration of the second example of the prior art of the head provided in the gas cutter in detail, Figure 5 is an exploded perspective view showing the tip 400 in the head of Figure 4, FIG. 6 is a side view of the tip of the tip 400 in FIG. 4, and the basic configuration of the gas cutter is similar to the above description.

That is, in the head frame 300, the fuel gas channel 311, the preheated oxygen channel 312, and the cut oxygen channel are connected to the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34, respectively. 313 is formed. Therefore, 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 respectively a fuel gas flow path 311, a preheated oxygen flow path 312, and a cut oxygen flow path. Each flows through 313.

In addition, the fastening member 500 and the head frame 300 are the rear end of the tip 400 by fastening the female screw portion 501 of the fastening member 500 and the male screw portion 301 of the head frame 300. The mounting groove 302 (see FIG. 5) formed at the tip of the frame 300 can be mounted and fixed.

As such, when the tip 400 is coupled to the head frame 300 by the fastening member 500, the tip 400 penetrates into the insertion hole 502 and protrudes toward the front end of the fastening member 500.

On the other hand, Figure 4 and Figure 5 shows the tip 400 used when the fuel gas is acetylene, acetylene-only tip 400 is composed of an outer tip 430 and the inner tip 440. The inner tip 440 is disposed in the space formed in the outer tip 430, the inside of the tip 400 has a double tube shape formed with a cutting oxygen passage 445 and the mixed gas passage 433. A connecting pipe 450 is fitted and fixed to the distal end portion of the cut oxygen passage 445, and a cut oxygen injection port 446 is formed at the end of the connecting pipe 450.

A plurality of slits 444 disposed radially are formed on the outer circumferential surface of the tip side of the inner tip 440 such that a mixed gas flows between the outer tip 430 and the inner tip 440, and the outer tip 430 The tip portion is formed longer than the tip portion of the inner tip 440, the through hole 433a is formed, the connecting pipe 450 is fitted into the through hole 433a is fixed, the cutting oxygen injection port ( A plurality of mixed gas ejection openings 435 are formed in the circumferential direction around the center 446, and the rear end of the mixed gas ejection opening 435 communicates with the mixed gas passage 433 through the slit 444.

Therefore, when cutting oxygen is supplied from the cutting oxygen flow passage 313 to the center of the rear end surface of the tip 400, the cutting oxygen is injected into the cutting oxygen injection port 446 through the cutting oxygen passage 445 and the connection pipe 450. The fuel gas and the preheated oxygen supplied from the fuel gas passage 311 and the preheated oxygen passage 312 are mixed in the head frame 300, and the mixed gas flows into the mixed gas passage 433, and then the slit 444. It is injected into the mixed gas injection port 435 through the). The crater 449 is formed by the cutting oxygen injection sphere 446 and the mixed gas injection sphere 435.

As described above, the cutting oxygen injection sphere 446 is disposed at the center of the inner tip 440, the plurality of mixed gas injection sphere 435 is disposed in the circumferential direction around the cutting oxygen injection sphere 446. Here, when the mixed gas injected into the mixed gas injection port 435 is ignited and the workpiece is sufficiently heated, and the cutting oxygen is injected through the cutting oxygen injection port 446, the workpiece may be oxidized to cut the workpiece. .

For reference, the tip 400 on which the crater 449 is formed may have a shorter life than the head frame 300 because foreign matters such as metal oxides scattered at the same time may be attached during the cutting operation. . In addition, the fire power required for the cutting operation may be different depending on the physical properties of the workpiece to be cut. Therefore, the tip 400 is separated from the headframe 300 and combined to be used as needed.

However, in the conventional tip 400, a plurality of mixed gas injection ports 435 are disposed in the circumferential direction around the cutting oxygen injection port 446 at the front end of the outer tip 430. If a small foreign material is blocked by the inflow, there is a problem that is very difficult to remove the foreign matter, since the spark is formed by the mixed gas ejected through the plurality of mixed gas injection port 435, the portion where the mixed gas injection port 435 is formed Due to the non-formed portion, it is not possible to maintain a uniform flame and pressure in the circumferential direction centering the cut oxygen injection sphere 446, thereby degrading preheating performance.

In addition, since the tip 400 is configured to connect the cutting oxygen passage 445 of the inner tip 440 and the cutting oxygen injection port 446 of the outer tip 430 to the connecting pipe 450, the number of parts is increased. There is a disadvantage in that the assembling work is cumbersome, and the deviation of the center of the cutting oxygen injection sphere 446 and the center of the mixed gas injection sphere 435 is increased by the error generated during the assembly of the connecting pipe 450, the cutting performance This deterioration, there is a cumbersome problem that often occurs when the connection pipe 450 is separated by high heat during the cutting operation.

The present invention is to solve the problems of the prior art as described above, the object of the present invention, by minimizing the occurrence of the pressure change due to the pressure difference on the mixed gas passage, it is possible to smooth the mixed gas injection and stable By forming a flame, it is possible to maintain a preheating performance, and to provide a gas cutting machine capable of maximally suppressing the occurrence of backfire due to the mixed gas pressure difference in the head.

Another object of the present invention, in coupling the head frame and the tip constituting the head, the operation of combining the injecting flow path provided in the head frame and the mixed gas passage provided in the tip to communicate with each other very quickly even by the unskilled person In addition, the injecting flow path of the injecting part can be efficiently and conveniently configured to perform laminar flow of preheated oxygen and fuel gas, and minimize the pressure difference in the mixed gas passage after the preheated oxygen and fuel gas are mixed. It is possible to prevent backfire, and even if backfire occurs, the flame does not reach the head, and the mixing rate of the mixed gas is improved to increase the thermal efficiency and to minimize the heating of the head. have.

Still another object of the present invention is to prevent the tip flows with respect to the head frame even when used for a long time to prevent the injecting flow passages and the mixed gas passages which are in communication with each other, and to prevent the contact surface between the head frame and the tip. The present invention provides a gas cutting machine capable of preventing the mixed gas flowing through the mixed gas passage and the cut oxygen passage from being mixed with the cut oxygen.

Another object of the present invention, even when a small foreign material is introduced into the mixed gas injection port is clogged, it is very convenient and quick to remove the foreign matter, and the mixed gas injection port is formed in a circular shape is formed around the central cut oxygen injection port It is to provide a gas cutting machine that can improve the preheating performance by forming a flame and pressure uniformly.

Still another object of the present invention is to provide a gas cutting machine capable of preventing backfire of acetylene combustion gas by providing a structure of a tip suitable for this even when the fuel gas is acetylene.

To explain the above objects in more detail, if the tip end (crater) of the tip is clogged and the pressure in the mixed gas passage is changed, the flow of the mixed gas occurs due to the pressure difference, and the flame at the tip end has a change in pressure. Backfire occurs in the mixed gas during the movement. To reduce backfire as much as possible, one of the best ways to reduce backfire is to reduce the pressure change as much as possible while preheating oxygen and fuel gas are mixed to the tip end.

The preheating oxygen and fuel gas are supplied along the pipe to a certain section in the structure of the gas cutting machine, and the torch mixing method that is mixed in the handle part such as the pipeline according to the position where the preheated oxygen and fuel gas are mixed, the head mixing method that is mixed in the head, It can be divided into the tip mixing method that is mixed at the tip.

The present invention has the greatest object to prevent the phenomenon of backfire by minimizing the structural pressure change in the movement passage of the preheated oxygen and fuel gas mixed gas.

In order to achieve the object, first, in the injecting section until the preheating oxygen and fuel gas are mixed, the injection speed of the preheating oxygen should be increased to make laminar flow between the preheating oxygen and the fuel gas. In the injecting section, it is important to maintain the laminar flow between the preheated oxygen and the fuel gas in the injecting section, because if the preheated oxygen and the fuel gas do not maintain the laminar flow, the mixture may backfire to the injecting section. In general, when the flame is backfired, the preheated oxygen and the combustion gas are mixed, and when the laminar flow is injected separately, it is possible to minimize the phenomenon that backfire occurs up to the portion.

Second, when the preheated oxygen and fuel gas is injected in the laminar flow in the injecting section, after the preheated oxygen and fuel gas is mixed in the mixing chamber provided at the tip, the mixed gas is injected to the tip (crater) of the tip The aim is to minimize the change in pressure.

Third, the injection speed of preheated oxygen is increased in the injection section to create laminar flow between preheated oxygen and fuel gas, and the amount of fuel gas injected is also increased to increase the thermal power, thereby improving the efficiency of the gas cutting machine.

Fourth, the purpose is to minimize the pressure change by maintaining the airtight in the passage that the oxygen and gas injected to form the oil layer in the injection section to the mixing chamber.

The present invention for achieving the above object is a gas cutting machine having a valve bundle and a head and the nozzle bundle is bound to the gas flow oxygen and fuel gas respectively, the head is a fuel gas flow path and preheated oxygen A head frame including a flow path and a cutting oxygen flow passage, and a mixing space portion in which fuel gas flowing through the fuel gas flow passage and preheating oxygen flowing through the preheating oxygen flow passage are mixed; A tip having an outer tip and an inner tip connected to the mixing space of the head frame and having a mixed gas passage through which mixed gas is introduced and a cutting oxygen passage connected with a cutting oxygen flow path of the head frame to introduce cutting oxygen; And a fastening member for coupling the head frame and the tip, wherein the mixing space portion of the head frame is formed in a cylindrical shape in which a cutting oxygen flow path is located at the center, and the inner tip is formed in a tubular shape so that the inside of the head frame is cut. It becomes an oxygen passage, by connecting the upper end of the inner tip to the cutting oxygen flow path of the head frame is connected to the cutting oxygen flow path of the inner tip and the cutting oxygen flow path of the head frame, the mixing space portion and the inner circumference of the mixing space portion It is characterized by being formed by the space between the outer circumferential surface of the inner tip.

In another aspect, the present invention is characterized in that the cross-sectional area size of the portion where the mixing space of the head frame and the mixed gas passage of the tip is connected to the same or cross-sectional area size is minimized.

The present invention also provides a gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle, wherein the head comprises a fuel gas flow passage, a preheating oxygen flow passage, and a cutting oxygen flow passage. A head frame having an injection passage for supplying fuel gas introduced through the fuel gas passage and preheated oxygen introduced through the preheating oxygen passage; A tip having a mixed gas passage through which the mixed gas from the head frame flows and a cutting oxygen passage through which the cutting oxygen flows in connection with the cutting oxygen flow path of the head frame; And a fastening member for coupling the head frame and the tip, wherein the inner tip is formed in a tubular shape to have a cutting oxygen passage and an upper end of the inner tip is coupled to the cutting oxygen flow passage of the head frame. The cutting oxygen flow passage is connected, and the injection flow passage formed in the head frame is characterized in that it is configured to be connected to the mixed gas passage of the outer tip.

In addition, the present invention is characterized in that the coupling between the inner tip and the head frame constituting the tip is made by mutual screwing or fitting.

In addition, the present invention, the inner tip of the tip and the coupling of the head frame, the upper end of the inner tip in close contact with the bottom of the head frame, a portion away from the top of the inner tip in contact with the inner circumference of the head frame It is formed by forming a flange portion, the flange portion is characterized in that a plurality of through holes in the circumferential direction for communicating the mixing space portion and the mixed gas passage.

The present invention also provides a gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle, wherein the head comprises a fuel gas flow passage, a preheating oxygen flow passage, and a cutting oxygen flow passage. And a head frame having a mixing space portion in which fuel gas introduced through the fuel gas flow path and preheated oxygen introduced through the preheating oxygen flow path are mixed. A tip having an outer tip and an inner tip connected to the mixing space of the head frame and having a mixed gas passage through which mixed gas is introduced and a cutting oxygen passage connected with a cutting oxygen flow path of the head frame to introduce cutting oxygen; And a fastening member for coupling the head frame and the tip, wherein the cross-sectional area size of the portion where the mixing space of the head frame and the mixed gas passage of the tip are connected is the same or is formed to minimize the difference in the cross-sectional area size. There is a characteristic.

The present invention also provides a gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle, wherein the head comprises a fuel gas flow passage, a preheating oxygen flow passage, and a cutting oxygen flow passage. A head frame having an injecting part for laminar flow of fuel gas and preheated oxygen introduced through the fuel gas flow path and the preheated oxygen flow path through the injection flow path; A mixed gas passage formed of an outer tip and an inner tip and formed by a space between the outer tip and the inner tip and connected to the injection passage of the head frame, and formed at the center of the inner tip to cut the head frame. A tip having a cut oxygen passage connected to the oxygen passage; And a fastening member for coupling the head frame and the tip, and having an insertion groove formed at the rear end of the tip, and having an insertion protrusion fitted at the insertion groove at the rear end of the tip. The inner tip is assembled at a constant position, and the injecting flow path of the head frame and the mixed gas passage of the tip are connected by the space between the outer tip and the inner tip except the insertion protrusion of the inner tip. Characterized in that the mixing chamber is formed to mix the preheated oxygen and fuel gas introduced by the laminar flow in the injecting flow path.

In addition, the present invention, the head frame and the inner tip is in contact with the cutting oxygen flow path and the cutting oxygen passage is connected to the inclined contact surface is formed in the inner tip and the inclined contact groove is formed in the head frame in close contact with the inclined contact groove There is a characteristic.

In another aspect, the present invention, the gas cutter having a valve bundle for flowing the oxygen and fuel gas in the gas state and the nozzle bundle and the head bound to the valve bundle, the head is a fuel gas flow path and preheated oxygen flow path, cutting oxygen flow path And an injector and an injecting passage for circulating the preheated oxygen introduced through the fuel gas and the preheating oxygen passage, respectively, and the injecting passage is formed up to a flat bottom surface. At the same time, the bottom surface is characterized in that it comprises a head frame formed with a groove connected to the cutting oxygen flow passage.

In another aspect, the present invention, the upper end of the inner tip having a cutting oxygen passage is connected to the groove formed on the bottom surface of the head frame, the upper end of the outer tip having a mixed gas passage around the inner tip bottom of the head frame It is characterized in that the close contact with the surface is bound by the fastening member.

In addition, the present invention is a gas cutting machine having a valve bundle and a nozzle bundle and the head bound to the gas flow oxygen and fuel gas, respectively, the head is preheated oxygen pipe and fuel gas pipe constituting the nozzle bundle The injector is mounted, and a mixed gas pipe for supplying the mixed gas generated by flowing from the injector is bound to the head frame, and a cutting oxygen flow path and a mixed gas flow path are formed in the head frame so that the cutting oxygen flow path and the mixed gas flow path of the tip are formed. It is configured to be connected to each of the furnace, characterized in that the cross-sectional area of the mixed gas pipe of the nozzle bundle is formed to be the same as the cross-sectional area of the mixed gas flow path formed in the head frame or the difference in the size of the cross-sectional area is minimized.

In another aspect, the present invention is characterized in that the cross-sectional area for the connection portion of the mixed gas passage of the head frame and the mixed gas passage formed in the tip is the same or the difference in size of the cross-sectional area is minimized.

In addition, the present invention is a gas cutter having a valve bundle and a head and the nozzle bundle and the head bound to the gas flow oxygen and fuel gas, respectively, the valve bundle flows the fuel gas including the cutting oxygen and preheating oxygen, respectively The nozzle bundle includes a tip and a head frame having a crater formed at a tip end thereof, and the cutting oxygen flowing from the valve bundle flows into the tip. A flow path, an injection flow path through which the preheated oxygen and the fuel gas flow from the valve bundle flow into the tip, and a flow rate of the preheated oxygen flowed into the injection oil increase the flow rate of the injection gas. Injectors are formed to allow laminar flow through each other, and the rear end of the tip is connected to the cut oxygen flow path. The cutting oxygen inflow hole and the inflow hole connected to the injecting flow path are formed, respectively, and the preheated oxygen and the fuel gas introduced into the tip form vortices from the inflow hole to form a vortex to generate a flammable mixed gas. A mixing chamber having a larger cross-sectional area than that of the inlet hole is formed, and one end of the alignment tube is fixed to either the injecting flow path of the head frame or the mixed gas inlet hole of the tip, and the alignment when the head frame and the tip are combined. By fitting the exposed end of the tube to the injecting flow path or the mixed gas inlet hole on the other side, it is characterized in that it is configured to match the center of the injection gas inlet of the head frame and the mixed gas inlet hole of the tip.

In addition, the present invention is characterized in that the alignment tube is fixed to the injection passage of the head frame, the inner diameter of the injection passage and the inner diameter of the alignment tube is set to be the same.

In addition, the present invention is characterized in that the alignment tube is provided with a packing fitted to the outer circumference, the tip is formed with a packing groove into which the packing is inserted.

The present invention also provides a gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle, wherein the head forms a cutting oxygen flow path at the center and the cutting oxygen. A mixed gas flow path is formed between an inner tip having a cut oxygen injection port for ejecting cleaved oxygen at a distal end of the flow path, and inserted into an outer circumference of the inner tip, and a mixed gas flow path at the distal end of the mixed gas flow path. And a tip formed of an outer tip forming a mixed gas injection port, and a circular hole penetrating in a horizontal direction to form the mixed gas flow path at a distal end of the outer tip forming the mixed gas injection port, A circle having a diameter smaller than that of the circular hole at the leading end of the inner tip corresponding to the cutting oxygen injection port The cylindrical insert is formed, and the cylindrical insert is characterized in that a mixed gas flow port is formed on the outer circumferential surface of the position spaced apart from the end by a cylindrical gas inlet to the circular hole of the outer tip. .

In addition, the present invention is characterized in that the mixed gas flow port has a plurality of protrusions and spaces and is formed in a polygon and inscribed in a circular hole of the outer tip.

In addition, the present invention is characterized in that the mixed gas flow port is made of a protrusion inscribed in a circular hole of the outer tip and a groove formed around the periphery of the protrusion.

In addition, the present invention is characterized in that the mixed gas flow port is located at the end of the mixed gas flow path, and the length of the mixed gas injection port is longer than or equal to the outer diameter of the mixed gas injection port.

According to the gas cutting machine according to the present invention, since the mixed gas injected from the injector is configured to flow to the tip through the mixed gas flow path in the head frame having a predetermined cross-sectional area, at the connection portion between the mixed gas flow paths of the tip including the mixed gas flow path. The pressure difference generated can be reduced as much as possible, thereby keeping the pressure change in the headframe to a minimum.

As a result, the injection of the mixed gas to the front end of the mixed gas passage is performed smoothly to form a stable flame to maintain the preheating performance and to prevent the backfire phenomenon caused by the pressure difference in the mixed gas passage to the maximum. do.

According to the gas cutter according to the present invention, by fitting and fixing an alignment tube through which oxygen and gas flow between the injecting flow path of the head frame and the mixed gas inlet hole of the tip, the mixing with the mixing flow path when the head frame and the tip are combined Even inexperienced workers can match the gas inlet holes very quickly and conveniently, and prevent the flow of the tip to prevent the injecting flow path and the mixed gas inlet hole from shifting to each other. It has the effect of preventing backfire by maintaining confidentiality.

According to the gas cutting machine according to the present invention, when the cylindrical insertion portion of the inner tip is inserted into the circular hole of the outer tip, the mixed gas flow port formed in the cylindrical insertion portion is automatically inscribed in the circular hole and the circular hole of the outer tip. The center of the mixed gas injection port formed by the cylindrical insertion portion of the inner tip coincides with the center of the cut oxygen injection port formed in the center of the inner tip.

Accordingly, since the cross section of the mixed gas injection sphere is formed in a circular shape, it is possible to maintain a uniform flame and pressure in the circumferential direction around the cutting oxygen injection sphere, thereby improving the preheating performance, even when foreign matter is caught in the mixed gas injection sphere. Mixing gas injection port is exposed by a simple operation of disassembling the tip and the inner tip has a very convenient effect of removing foreign substances.

According to the gas cutting machine according to the present invention, even when the fuel gas is acetylene, by providing a structure of a tip suitable for this, there is an effect of preventing backfire of acetylene combustion gas.

1 is a front view showing the overall configuration of the gas cutter,

2 is a cross-sectional view of the valve bundle provided in the gas cutting machine,

3 is a cross-sectional view showing a first example of the prior art for the head provided in the gas cutting machine,

Figure 4 is a cross-sectional view showing a second example of the prior art for the head provided in the gas cutter,

5 is an exploded perspective view illustrating a tip in the head of FIG. 4;

FIG. 6 is a side view showing the tip of the tip in FIG. 4;

7 is a cross-sectional view showing a head for a gas cutter according to a first embodiment of the present invention;

FIG. 8 is a sectional view of principal parts showing a first modification of the head of the gas cutter according to the first embodiment of FIG.

FIG. 9 is a sectional view of principal parts showing a second modification of the head of the gas cutter according to the first embodiment of FIG.

FIG. 10 is a sectional view of principal parts showing a third modification of the head of the gas cutter according to the first embodiment of FIG.

11 is a cross-sectional view taken along the line I-I of FIG. 10;

12 is an exploded cross-sectional view showing a fourth modification of the head for the gas cutter according to the first embodiment of FIG.

FIG. 13 is a cross-sectional view of the gas cutting head shown in FIG. 12 assembled;

14 is an enlarged view of a portion “A” of FIG. 13;

15 is a cross-sectional view showing a head for a gas cutter according to a second embodiment of the present invention;

16 is a cross-sectional view showing a head for a gas cutter according to a third embodiment of the present invention;

17 is an exploded perspective view of an essential part of a head for a gas cutter according to the third embodiment of FIG. 16;

FIG. 18 is a perspective view of an assembled state of the tip in the gas cutter head according to the third embodiment of FIG. 16;

FIG. 19 is a front view showing the tip of the tip assembled in the gas cutting head according to the third embodiment of FIG.

20 is a sectional view of the main parts of the head of the gas cutter according to the third embodiment of FIG.

21 is a cross-sectional view showing a head for a gas cutter according to a fourth embodiment of the present invention;

FIG. 22 is an enlarged view of a portion “B” of FIG. 21;

FIG. 23 is an exploded cross-sectional view of the head for the gas cutter according to the fourth embodiment of FIG.

24 is an exploded perspective view of a tip in the head for a gas cutter according to the fourth embodiment of the present invention shown in FIG. 21;

25 is a view of the crater viewed from the direction "a" in FIG. 21,

FIG. 26 is a rear end view of the inner tip viewed from the direction “b” of FIG. 24; FIG.

FIG. 27 is a distal end view of the headframe according to the fourth embodiment of the FIG. 21 display;

FIG. 28 is an exploded sectional view of the head of the gas cutter showing the first modification of the fourth embodiment of FIG. 21;

FIG. 29 is a rear end view of the tip in FIG. 28;

FIG. 30 is a sectional view of the head frame of the gas cutter showing the second modification of the fourth embodiment of FIG.

FIG. 31 is a sectional view of the head frame of the gas cutter showing the third modification of the fourth embodiment of FIG.

32 is a cross-sectional view showing a head for a gas cutter according to a fifth embodiment of the present invention;

FIG. 33 is a perspective view illustrating a state in which a tip is disassembled in a gas cutting head according to the fifth embodiment of FIG. 32;

FIG. 34 is a side view showing the tip of a tip in the head for a gas cutter according to the fifth embodiment of FIG.

FIG. 35 is a cross-sectional view taken along the line II-II of FIG. 32;

36 is a cross-sectional view taken along the line III-III of FIG. 32;

FIG. 37 is a sectional view of a head for a gas cutter showing a modification to the fifth embodiment of FIG. 32;

FIG. 38 is an exploded perspective view of the tip in the gas cutter head shown in FIG. 37;

FIG. 39 is a side view showing the tip of the tip in the gas cutter head shown in FIG. 37;

40 is a cross-sectional view taken along the line IV-IV of FIG. 37;

FIG. 41 is a cross-sectional view taken along the line V-V in FIG.

The present invention provides a gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle, wherein the head forms a cutting oxygen flow passage in the center and the cutting oxygen flow passage. An inner tip having a cleaved oxygen injection port for ejecting cleaved oxygen at a distal end of the distal end, and inserted into an outer circumference of the inner tip to form a mixed gas flow path between the inner tip and ejecting the mixed gas at the distal end of the mixed gas flow path. A tip consisting of an outer tip forming a mixed gas injection port, and having a circular hole penetrating in a horizontal direction to form the mixed gas flow path at a distal end of the outer tip forming the mixed gas injection port; A cylindrical portion having a diameter smaller than that of the circular hole at the distal end portion of the inner tip, the same center as the cut oxygen injection port The cylindrical insert is formed, the cylindrical insert is formed on the outer circumferential surface of the position spaced apart from the end at the end of the circumference around the cylindrical insert is formed in the mixed gas flow inlet in contact with the circular hole of the outer tip, the mixed gas flow port is At the same time having a plurality of protrusions and spaces are formed in a polygon and inscribed in the circular hole of the outer tip, or the mixed gas flow opening is composed of a projection inscribed in the circular hole of the outer tip and a groove formed around the periphery of the protrusion There is a characteristic.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail in the written description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

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

First, in describing the embodiments of the present invention, the same parts as those of the above-described gas cutter will be described with the same reference numerals.

7 to 14 show a gas cutter according to the first embodiment of the present invention.

According to the first embodiment of the present invention, as shown in FIG. 7, the head 30 includes a head frame 300 and a tip 400, and a fastening member for coupling the head frame 300 and the tip 400. 500). The head frame 300 is connected to the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 to supply fuel gas, preheated oxygen, and cut oxygen to the fuel gas flow path 311 and the preheated oxygen flow path ( 312) and a cleaved oxygen flow path 313 is formed.

In addition, the head frame 300 is provided with a mixing space 351 for mixing fuel gas and preheated oxygen, the mixing space 351 is introduced into the head frame 300 through the preheated oxygen flow path 312. The preheated oxygen is ejected into the mixing space 351 through the preheated oxygen discharge port 312a of the injector 350 formed inside the headframe 300 and introduced into the headframe 300 through the fuel gas flow path 311. The fuel gas and the preheated oxygen are mixed in the mixing space 351 by ejecting the fuel gas into the mixing space 351 through the fuel gas outlet 311a which is in contact with the space formed around the injector 350. Be sure to

On the other hand, the tip 400 is composed of the outer tip 430 and the inner tip 440, the inner tip 440 is formed in a tubular shape is disposed in the space formed in the outer tip 430 to the inside of the tip 400 Has a double pipe shape in which a mixed gas passage 433 between the outer tip 430 and the inner tip 440 and the cutting oxygen passage 445 inside the inner tip 440 is formed, and the head is fastened by the fastening member 500. By combining the frame 300 and the tip 400, the mixing space portion 351 of the head frame 300 is connected to the mixed gas passage 433 of the tip 400 through the open lower portion, the head frame ( The cut oxygen passage 313 of 300 is connected to the cut oxygen passage 445 of the tip 400.

At this time, the mixing space portion 351 of the head frame 300 is formed in a cylindrical shape, the outlet of the cutting oxygen flow path 313 is located in the center, the upper end of the inner tip 440 cut of the head frame 300 By cutting the oxygen passage 445 of the inner tip 440 and the cutting oxygen passage 313 of the head frame 300 by coupling to the outlet of the oxygen passage 313, the mixing space portion 351 is It is formed by the space between the inner circumferential surface of the mixing space portion 351 and the outer circumferential surface of the inner tip 440.

In addition, the portion where the mixing space portion 351 of the head frame 300 and the mixed gas passage 433 of the tip 400 are formed to have the same cross-sectional area size or to minimize the size difference of the cross-sectional area. The pressure of the mixed gas in the mixing space 351 and the pressure of the mixed gas in the mixed gas passage 433 may be equal to each other or the pressure difference may be minimized.

In the first embodiment illustrated in FIG. 7, the inner tip 440 of the tip 400 is coupled to the head frame 300 by fitting, but is not limited thereto. The inner tip 440 and the head frame ( As another modified example of coupling 300, as shown in FIG. 8, threaded

portions

441a and 301a may be formed on the inner tip 440 and the head frame 300, and screwed together, as shown in FIG. Fit the inner tip 440 to the head frame 300 as described above, the fitting portion to the tapered portion (441b, 301b) shape to combine the head frame 300 and the tip 400 with the fastening member 500. At this time, the inner tip 440 and the head frame 300 may be more strongly in close contact.

In addition, FIG. 10 illustrates a case in which a flange portion 440a is formed on the inner tip 440 to be in contact with the inner circumferential surface of the head frame 300 to be coupled to the head frame 300. The upper end of the tip 440 is in close contact with the bottom surface of the head frame 300, and the flange portion 440a is formed at a portion away from the upper end of the inner tip 440 by mixing the space above the flange portion 440a The portion 351 is positioned, and the flange portion 440a may be formed by forming a plurality of through holes 440b in the circumferential direction to communicate the mixing space portion 351 with the mixed gas passage 433. .

In this case, it is preferable that the total cross-sectional area of the plurality of through holes 440b is formed so as not to be as different as possible from the cross-sectional area of the mixing space 351. As shown in FIG. 11, the through holes 440b and the through holes ( The connecting portion 440c between the 440b forms the size of the through hole 440b as large as possible, leaving only the minimum thickness having the structural strength sufficient to maintain the configuration of the flange portion. It is preferable to form such that the total cross-sectional area of the through hole 440b is 8/10 to 9/10.

Referring to the operation of the gas cutting head of this configuration is as follows.

As shown in FIG. 7, the preheated oxygen introduced into the head frame 300 through the preheated oxygen flow path 312 is mixed into the mixing space 351 through the preheated oxygen discharge outlet 312a connected to the preheated oxygen flow path 312. The fuel gas discharged and introduced into the head frame 300 through the fuel gas flow path 311 is discharged into the mixing space part 351 through the gas outlet port 311a of the space part 350a, and thus, the mixing space part ( In 351, a mixed gas of preheated oxygen and fuel gas is generated.

The mixed gas generated in the mixing space 351 is introduced into the mixed gas passage 433 between the outer tip 430 and the inner tip 440 directly connected to the mixing space 351 to the front end of the tip 400. The discharged oxygen is introduced into the cutting oxygen passage 445 of the inner tip 440 through the cutting oxygen flow passage 313 of the head frame 300 and discharged to the tip portion of the tip 400.

Therefore, if the mixed gas injected to the tip of the mixed gas passage 433 is ignited to sufficiently heat the workpiece (not shown) and the cut oxygen is injected through the tip of the cut oxygen passage 445, the workpiece is oxidized. Cutting of the workpiece can be done.

In this embodiment, the fuel gas and the preheated oxygen are mixed in the mixing space 351 provided in the head frame 300, the cross-sectional area of the mixing space 351 is the mixed gas passage 433 of the tip 400 By forming the same as the cross-sectional area of the), the pressure between the mixing space 351 and the mixed gas passage 433 may be the same or the pressure difference can be kept to a minimum.

Therefore, by minimizing the pressure change in the entire passage through which the mixed gas flows in the head 30, the mixed gas is smoothly sprayed to maintain preheating performance with stable flame formation, and at the same time, the pressure change due to the pressure difference on the mixed gas flowing passage. It is possible to suppress the backfire phenomenon caused by the generation as much as possible.

In addition, the present invention eliminates the need for the flange portion formed in the conventional inner tip in the process of forming the cross-sectional area of the mixing space 351 of the head frame 300 to be the same as the cross-sectional area of the mixed gas passage 433 of the tip 400. As a result, the manufacturing and assembly of the inner tip 440 is easier and there is an advantage that the total weight of the head can be reduced.

10 and 11, even when the flange portion 440a is formed on the inner tip 440 to be coupled to the head frame 300, a portion away from the upper end of the inner tip 440. By forming the flange portion 440a at the top, the mixing space portion 351 may be maintained on the flange portion 440a.

The plurality of through holes 440b formed in the flange portion 440a are formed such that the total cross-sectional area of the flange portion 440a does not differ as much as the cross-sectional area of the mixing space portion 351, and thus the mixing space portion 351 and the mixing space in which the mixed gas exists. The pressure difference on the flow passage of the mixed gas connected to the two through holes 440b and the mixed gas passage 433 can be minimized.

In the modified example shown in FIGS. 12 to 14, the outer tip 430 and the inner tip 440 may be in close contact with each other without forming the mixing space 351 in the head frame 300.

That is, the head frame 300 has a fuel gas flow path 311, a preheated oxygen flow path 312, and a cut oxygen flow path 313, respectively, and at the same time, the fuel gas and the preheated oxygen flow through the fuel gas flow path 311. An injector 350 and an injecting flow passage 352 are provided to distribute preheated oxygen flowing through the flow passage 312.

In this case, the injecting flow passage 352 is formed to the bottom surface 300a which is flat, and at the same time, a groove 313a which is connected to the cutting oxygen flow passage 313 is formed at the center of the bottom surface 300a.

The upper end of the inner tip 440 having the cut oxygen passage 445 is fitted into the groove 313a formed on the bottom surface 300a of the head frame 300, and is mixed around the inner tip 440. The upper end of the outer tip 430 having the gas passage 433 is in close contact with the bottom surface 300a of the head frame 300.

The outer diameter of the outer tip 430 may have the same outer diameter as the bottom surface 300a of the head frame 300 and may be coupled to the head frame 300 by screwing the fastening member 500 as described above.

Accordingly, the preheated oxygen and fuel gas supplied from the preheated oxygen discharge port 312a and the fuel gas discharge port 311a of the injector 350 provided in the head frame 300 through the injecting flow path 352 to the outer tip ( 430 and the inner tip 440 is directly discharged to the mixed gas passage 433 side.

Even in this case, as the preheated oxygen and fuel gas reach the mixed gas passage 433 having a large cross-sectional area in the course of flowing through the injecting passage 352, the flow rate is rapidly reduced and vortices are mixed with each other. Therefore, the larger the cross-sectional area of the injection passage 352 and the cross-sectional area of the mixed gas passage 433, the greater the effect of generating the vortex.

In addition, the mixing ratio of the preheated oxygen and fuel gas is increased to increase the thermal efficiency of the mixed gas injected into the crater of the tip 400, the effect of this modification is the same as described above, so the detailed description is omitted. do.

15 shows a gas cutting machine according to a second embodiment of the present invention.

According to the second embodiment of the present invention, as shown in FIG. 15, the head 30 has a head frame 300 and a tip 400, and a fastening member for coupling the head frame 300 and the tip 400 ( 500).

On the other hand, an external injector 350a is coupled to the fuel gas pipe 32 and the preheated oxygen pipe 33 of the nozzle bundle 3, and one mixed gas pipe 35 is connected to the head frame (from the external injector 350a). Bound to 300). In addition, as the cutting oxygen pipe 34 is directly bonded to the head frame 300, the mixed gas flow path 314 and the cutting oxygen flow path 313 are formed in the head frame 300.

Here, the cross-sectional area of the mixed gas pipe 35 and the cross-sectional area of the mixed gas flow path 314 formed in the head frame 300 are preferably the same without changing the diameter or to minimize the change, the mixing by this configuration Pressure changes can be prevented or kept to a minimum during gas flow.

On the other hand, the tip 400 is composed of the outer tip 430 and the inner tip 440, the inner tip 440 is formed in a tubular shape is disposed in the space formed in the outer tip 430, the tip of the 400 The interior has a double pipe shape in which the mixed gas passage 433 between the outer tip 430 and the inner tip 440 and the cut oxygen passage 445 inside the inner tip 440 are formed.

In addition, by combining the head frame 300 and the tip 400 by the fastening member 500, the mixed gas flow path 314 of the head frame 300 is connected to the mixed gas passage 433 of the tip 400. The cut oxygen flow passage 313 of the head frame 300 is connected to the cut oxygen passage 445 of the tip 400.

Here, the portion where the mixed gas passage 314 of the head frame 300 and the mixed gas passage 433 of the tip 400 are connected may form the same cross-sectional area or minimize the cross-sectional area to minimize the pressure of the mixed gas. It is desirable that no differences occur.

Referring to the operation of the gas cutting head 30 of the configuration according to the second embodiment as follows.

As shown in FIG. 15, the fuel gas and the preheated oxygen introduced through the fuel gas pipe 32 and the preheating oxygen pipe 33 generate the mixed gas through the external injector 350a and simultaneously to the mixed gas pipe 35. And is then supplied to the tip 400 via the mixed gas flow passage 314 in the headframe 300.

In addition, the mixed gas is introduced into the mixed gas passage 433 between the outer tip 430 and the inner tip 440 directly connected to the mixed gas flow path 314 is discharged to the tip of the tip 400, the cutting oxygen The cutting oxygen flow path 313 of the head frame 300 flows into the cutting oxygen passage 445 of the inner tip 440 and is discharged to the tip portion of the tip 400.

Accordingly, the mixed gas injected into the front end of the mixed gas passage 433 is ignited to sufficiently heat the workpiece, and then the cutting oxygen is injected through the cut oxygen passage 445 of the tip 400 to oxidize the workpiece. Cutting will be done.

In addition, in the second embodiment of the present invention, the mixed gas flow path 314 in the mixed gas pipe 35 and the head frame 300 in which the mixed gas generated by flowing from the external injector 350a has the same cross-sectional area or the change thereof is minimal. It is supplied to the tip 400 along, and then configured to be injected through the mixed gas passage 433, it is possible to suppress the occurrence of the pressure difference for the mixed gas or to maintain the minimum.

16 to 20 show a gas cutter head according to a third embodiment of the present invention.

As shown in FIG. 16, the third embodiment of the present invention includes a fuel gas flow path 311 connected to the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 in the head frame 300. ), A preheated oxygen flow passage 312 and a cut oxygen flow passage 313 is formed. Therefore, 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 respectively a fuel gas flow path 311, a preheated oxygen flow path 312, and a cut oxygen flow path. Respectively through 313.

An insertion hole 502 penetrating in the axial direction is formed in the fastening member 500, and an internal thread part 501 is formed on an inner circumferential surface thereof, and a female coupling part 501 is screwed to the outer circumferential surface of the front end of the head frame 300. A male screw portion 301 is formed.

Tip 400 is composed of a cylindrical outer tip 430 and the inner tip 440, the inner tip 440 is disposed in the space formed in the outer tip 430, by the central space of the inner tip 440 The cut oxygen passage 433 is formed, and has a double pipe shape in which the mixed gas passage 445 is formed by the space between the outer tip 430 and the inner tip 440.

The rear end of the tip 400 is coupled to the head frame 300 by the fastening member 500, the outer tip of the diameter larger than the insertion hole 502 of the fastening member 500 to the rear end of the outer tip 430 The flange portion 430a is formed.

Insertion hole by screwing the female threaded portion 501 of the fastening member 500 and the male threaded portion 301 of the head frame 300 while the outer tip flange portion 430a is held in the fastening member 500. The tip 400 penetrates to 502 and may be coupled to protrude in the direction of the distal end of the fastening member 500.

As shown in FIGS. 17 and 18, the tip 400 is assembled with the outer tip 430 and the inner tip 440, for example, two insertion grooves (eg, two insertion grooves) in the flange portion 430a of the outer tip. 431 is formed at 180 degree intervals. On the outer circumferential surface of the rear end of the inner tip 440, two insertion protrusions 441 fitted into the insertion groove 431 are also formed at intervals of 180 degrees.

Therefore, as shown in FIG. 19, when the insertion protrusion 441 of the inner tip 440 is inserted into the insertion groove 431 of the outer tip 430, the inner tip 440 with respect to the outer tip 430. Can be assembled at any time.

As shown in FIG. 20 in the assembled state of the tip 400 assembled as described above, the female screw portion 501 of the fastening member 500 and the male screw portion 301 of the head frame 300 are screwed to the head frame. When combined with the

tip

300 and 300, the cutting oxygen flow path 313 of the head frame 300 is connected to the cutting oxygen flow path 445 of the tip 400, the injection flow path of the head frame 300 352 is connected to the mixed gas passage 433 by the space between the outer tip 430 and the inner tip 440 except for the insertion protrusion 441 of the inner tip 440.

At this time, the space connecting the injecting flow passage 352 and the mixed gas passage 433 is a mixing chamber in which preheated oxygen and fuel gas are introduced into the laminar flow in the injecting flow passage 352 and mixed therein ( 353).

When the preheated oxygen and fuel gas flowing in the laminar flow in the injection passage 352 enter the mixing chamber 353 having a larger cross-sectional area than the injection passage 352, the flow rate is reduced and vortices are formed. The fuel gas is mixed to produce a mixed gas having flammability.

Therefore, the cutting oxygen supplied to the cutting oxygen passage 445 of the tip 400 is injected into the tip (furnace) of the cutting oxygen passage 445, and is generated in the mixing chamber 353 of the tip 400 to generate the mixed gas passage ( The mixed gas supplied to the 433 is injected into the tip (crater) of the mixed gas passage 433 to form a crater at the tip of the tip 400, and the ignition of the mixed gas injected from the tip of the mixed gas passage 433 is achieved. After the workpiece is sufficiently heated, the workpiece can be cut by the cut oxygen injected at the tip of the cut oxygen passage 445.

In addition, the third embodiment of the present invention, the head frame 300 and the inner tip 440 in contact with the cutting oxygen flow path 313 and the cutting oxygen passage 445, the inclined to the inner tip 440 A contact surface 445a is formed and an inclined contact groove 313b is formed in the head frame 300 to closely contact the inclined contact surface 445a.

Therefore, when the head frame 300 and the tip 400 are coupled, the inclined contact surface 445a of the inner tip 440 is in close contact with the inclined contact groove 313b of the head frame 300 to cut the mixed gas passage 433. By keeping the airtight between the oxygen passages 445 more reliably, it is possible to prevent the mixed gas and the cut oxygen flowing in both passages from mixing with each other.

In addition, the internal structure of the head frame 300 will be described with reference to FIG. 16. An injector 350 for mixing fuel gas and preheated oxygen is formed in the head frame 300. The injector 350 is formed at the center of the injecting chamber 350a connected to the end of the fuel gas flow path 311, the injecting core 350b provided in the injecting chamber 350a, and the injecting core 350b. The central channel 350c is formed, and the central channel 350c is connected to the preheated oxygen channel 312.

In addition, an injection passage 352 is formed in front of the central passage 350c of the injection core 350b, which is formed in succession with the injection chamber 350a, and the injection passage 352 has a head frame 300 and a tip ( When combined with 400 is connected to the mixing chamber (353).

Therefore, the fuel gas in the injection chamber 350a along with the preheated oxygen injected at a high speed from the central flow path 350c of the injecting core 350b and flows into the injection flow path 352 is injected along with the preheated oxygen. ), And the preheated oxygen and fuel gas introduced into the injection passage 352 undergo laminar flow when passing through the injection passage 352.

In addition, the length of the injection passage 352 may be shorter than that of the related art, and thus, the preheated oxygen and the fuel gas may be mixed in the injection passage 352 and flow in the mixed gas state as much as possible.

In the present embodiment, the laminar flow flows through preheated oxygen and fuel gas through the pipeline formed by the injecting flow passage 352, and the preheated oxygen flows through the center and the fuel gas flows through the edge. It refers to the flow of forming a layered structure without mixing with each other.

When the laminar flow of preheated oxygen and fuel gas reaches the mixing chamber 353 having a large cross-sectional area in the process of flowing into the mixing chamber 353 of the tip 400 through the injecting passage 352, the flow rate decreases rapidly. Vortex is formed and mixed with each other. Accordingly, the mixing rate of the preheated oxygen and the fuel gas is increased, thereby increasing the thermal efficiency of the mixed gas injected through the mixed gas passage 433.

As described above, according to the third embodiment of the present invention, the injector 350 is disposed in the headframe 300, so that flames do not flow into the injecting flow passage 352 even when backfire occurs during use. Since only up to), it is possible to obtain an effect that the possibility of an accident such as explosion due to backfire or overheating of the head frame 300 is very low.

For reference, partial mixing may occur at the interface between the preheated oxygen and fuel gas flowing in a layered structure, but a small amount of mixed gas may be generated. It does not have enough flammability to flow into 352.

In the present embodiment, 'laminar flow' refers to a fluid that maintains a layered structure so that flames do not flow into the injecting flow path 352 even though a portion of the preheated oxygen and fuel gas are mixed, and thus does not have sufficient flammability. . To this end, the length of the injection passage 352 may be formed to have a length such that the laminar flow is maintained.

On the other hand, the gas cutter head 30 of the present invention, since the fuel gas in the injecting chamber 350a is sucked into the injecting flow path 352 by the high-speed injection of preheated oxygen, which is relatively higher than the fuel gas, Unlike the method of relying on the supply pressure of the fuel gas, the fuel gas is stably supplied, so that a constant thermal power can be maintained.

In addition, since the injection passage 352 is disposed in the head frame 300, even if a backfire occurs during use, there is no possibility of causing a safety accident such as an explosion due to a flame.

As described above, the head frame 300 does not require a separate sealing member to prevent the fuel gas, preheated oxygen and cut oxygen are mixed with each other. That is, since the fuel gas, preheated oxygen, and 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 300 is heated by backfire or the like to deteriorate the sealing member. The mixing phenomenon of the fuel gas, preheated oxygen, and cleaved oxygen may not be generated due to the damage.

21 to 31 show a gas cutter according to a fourth embodiment of the present invention.

In the fourth embodiment of the present invention, as shown in Figs. 21 to 23, the fastening member 500 has an insertion hole 502 formed therein, and an internal thread portion 501 is formed on the inner circumferential surface thereof. A male screw portion 301 is formed on the outer circumferential surface of the front end of the head frame 300, and the male screw portion 301 of the head frame 300 is formed in a shape corresponding to the female screw portion 501 of the fastening member 500.

Accordingly, the fastening member 500 may be fastened to the head frame 300 as shown in FIGS. 21 and 23, wherein the rear end of the tip 400 is seated in a shape recessed in the front end of the head frame 300. After being seated in the groove 302, it is fixed by the fastening member 500. That is, the threaded portion 502 of the fastening member 500 and the male threaded portion 301 of the head frame 300 are coupled to each other.

As described above, when the tip 400 is coupled to the head frame 300 by the fastening member 500, the tip 400 penetrates into the insertion hole 502 and protrudes toward the front end of the fastening member 500. The tip 400 includes an outer tip 430 and the inner tip 440, the inner tip 440 is disposed in the space formed in the outer tip 430, the inside of the tip 400 as shown The cut oxygen passage 445 and the mixed gas passage 433 have a double tube shape.

An outer tip flange portion 430a having an expanded diameter is formed at the rear end of the outer tip 430, and an inner tip flange portion 440a having an expanded diameter at the rear end of the inner tip 440. Is formed. The inner tip flange portion 440a and the outer tip flange portion 430a are formed to have a corresponding outer diameter, and the inner tip flange portion 430a is formed to have a shape corresponding to the seating groove 302.

Therefore, when the tip 400 is fixed to the head frame 300 by the fastening member 500, the inner tip flange portion 440a is seated in the seating groove 302, the outer tip flange portion 430a is the inner tip It is pressed by the fastening member 500 in a state where it overlaps the flange portion 440a.

The outer diameter of the outer tip 430 and the outer diameter of the inner tip 440 have a shape that decreases toward the front end portion. The inner tip 440 has a cutting oxygen passage 445 formed in a shape penetrating the front end portion from the rear end, and the cutting end oxygen passage 445 forms a cutting oxygen injection port 446.

On the outer circumferential surface of the portion where the outer diameter of the inner tip 440 is reduced, a plurality of slits 444 disposed radially around the cut oxygen injection sphere 446 are formed. A through hole 433a is formed at the tip of the outer tip 430. When the inner tip 440 is inserted into the outer tip 430, the portion of which the outer diameter of the inner tip 440 is reduced is the through hole of the outer tip 430. 433a).

Here, the outer diameter of the portion of which the outer diameter of the inner tip 440 is reduced is formed to correspond to the inner diameter of the through hole 433a of the outer tip 430. In addition, the outer diameter of the middle portion of the inner tip 440 is formed smaller than the inner diameter of the middle portion of the outer tip 430.

Accordingly, when the inner tip 440 is inserted into the outer tip 430, a mixed gas passage 433 is formed between the outer circumferential surface of the inner tip 440 and the inner circumferential surface of the outer tip 430.

In addition, a mixed gas inlet hole 442 is formed through the inner tip flange 440a. At this time, the rear tip surface of the outer tip flange portion 430a is formed so that the mixed gas inlet hole 442 is not blocked by the outer tip flange portion 430a when it comes into contact with the inner tip flange portion 440a. The rear end of the mixed gas passage 433 is connected to the mixed gas inlet hole 442.

On the other hand, the mixing chamber connected to the front end of the mixed gas inlet hole 442 is formed at the rear end of the mixed gas passage 433, the cross-sectional area is formed to be wider than the mixed gas inlet hole (442). Here, the mixing chamber is not formed separately from the mixed gas passage 433 and refers to a portion of the rear end of the mixed gas passage 433.

When the preheated oxygen and fuel gas introduced into the mixed gas inlet hole 442 flow into the mixing chamber having a large cross-sectional area, the flow rate decreases and forms a vortex. In this process, the preheated oxygen and fuel gas are mixed to produce a flammable mixed gas. Is generated.

Therefore, when the cutting oxygen is supplied to the center of the rear end surface of the tip 400, the cutting oxygen is injected into the cutting oxygen injection port 446 through the cutting oxygen passage 445 and the preheated oxygen introduced into the mixed gas inlet hole 442. The fuel gas generates a mixed gas while passing through the mixing chamber of the mixed gas passage 433, and the mixed gas is injected into the through hole 433a through the slit 444 through the mixed gas passage 433.

As illustrated in FIG. 25, the crater 449 provided at the tip of the tip 400 is provided with a cutting oxygen injection sphere 446 and a mixed gas injection sphere 435, respectively. As described above, the cutting oxygen injection port 446 is disposed at the center of the inner tip 440, the mixed gas injection port 435 is disposed radially around the cutting oxygen injection port 446.

Here, the mixed gas injection port 435 is formed by the slit 444, is ignited by the mixed gas injected into the mixed gas injection port 435, and the workpiece is sufficiently heated, the cutting oxygen through the cutting oxygen injection port 446 Cutting of the workpiece can be done while is sprayed.

In addition, although the cross-sectional area of the mixed gas passage 433 may be differently formed as necessary, in the fourth embodiment of the present invention, the cross-sectional area is widest in the mixing chamber and the cross-sectional area decreases toward the mixed gas injection port 435 again. Have

This allows sufficient vortices to be generated during the preheating oxygen and fuel gas flowed from the mixed gas inlet hole 442 into the mixing chamber having a large cross-sectional area so that the mixing rate is improved, and the cross-sectional area is increased as it flows to the mixed gas injection port 435. As the flow rate increases, the flow rate is increased so that the mixed gas is injected from the fireball 449 at a sufficient flow rate to prevent backfire in the process.

The rear end of the cut oxygen passage 445 is disposed at the center of the rear end face of the inner tip flange 440a, and the mixed gas inlet hole 442 is disposed at the edge portion thereof. That is, in order to cut oxygen to be injected into the cutting oxygen injection port 446 and mixed gas to be injected into the mixed gas injection hole 435 as described above, cutting oxygen should be supplied to the cutting oxygen passage 445 and the mixed gas inlet hole In (442), preheated oxygen and fuel gas should be introduced.

Therefore, the mounting groove 302 formed at the front end of the head frame 300 coupled with the rear end surface of the inner tip flange portion 440a should also have a corresponding shape. The front end of the cutting oxygen flow path 313 is disposed at the center of the seating groove 302 formed at the front end of the head frame 300, and the front end of the injection flow path 352 is disposed at the periphery thereof. Here, the injection passage 352 is formed at the center of the injection cap 360.

Therefore, when the rear end surface of the inner tip 440 is fixed to the seating groove 302 of the head frame 300, the cutting oxygen passage 445 formed in the center of the inner tip 440 and the cutting oxygen formed in the head frame 300 The flow paths 313 are connected to each other. That is, the cutting oxygen flowing into the head frame 300 and flowing through the cutting oxygen flow passage 313 is injected into the cutting oxygen injection port 446 through the cutting oxygen passage 445 of the inner tip 440.

The preheated oxygen and fuel gas flowing through the injection passage 352 are introduced through the mixed gas inlet hole 332 and injected into the mixed gas injection hole 435.

On the other hand, the alignment pipe 370 is inserted into one of the injecting flow path 352 or the mixed gas inlet hole 442 of the head frame 300, for example, the injecting flow path 352 of the head frame 300. In a fixed state, the alignment tube 370 may be fitted into the mixed gas inlet hole 442 formed in the tip 400 when the tip 400 is coupled to the tip 400.

Therefore, the centers of the injecting channel 352 and the mixed gas inlet hole 442 coincide with each other, and the inner diameter of the injecting channel 352 and the inner diameter of the alignment tube 370 may be set to be the same.

On the contrary, although not shown, the alignment tube 370 is fixed to the mixed gas inlet hole 442 of the tip 400, and then the alignment tube 370 is coupled to the head frame 300 at the tip 400. The center of the injecting channel 352 and the mixed gas inlet hole 442 may be formed by fitting into the injecting channel 352 of FIG.

In addition, the outer periphery of the alignment tube 370 is provided with a packing 371 fitted into the circumferential surface, the packing groove 371a into which the packing 371 is inserted into the inner tip 440 of the tip 400. By forming a) it is possible to maintain the airtight between the alignment tube 370 and the inner tip 440 at the same time the head frame 300 and the tip 400 is coupled.

Therefore, the mixed gas flowing through the mixed gas passage 435 and the cut oxygen flowing through the cut oxygen passage 445 may be blocked by the packing 371.

In addition, the internal structure of the head frame 300 will be described. In the head frame 300, an injecting part in which fuel gas and preheated oxygen are mixed to generate a mixed gas is formed. The injecting part is formed by the fuel gas chamber 311b formed at the end of the fuel gas flow path 311, the injecting core 361 and the injecting cap 360 installed in the fuel gas chamber 311b.

The injecting core 361 has a cylindrical outer circumferential surface, and a preheated oxygen flow passage 312 is formed at the center thereof in the longitudinal direction. The preheated oxygen flow passage 312 is formed in a shape penetrating from the front end to the rear end of the injecting core 361 and is connected to the preheated oxygen injection hole 312b formed at the front end of the injecting core 361. The preheated oxygen injection hole 312b may be formed to have a diameter smaller than that of the preheated oxygen flow path 312.

A tapered surface 361a is formed outside the tip end of the injecting core 361. The tapered surface 361a is formed such that the outer diameter of the injecting core 361 decreases toward the distal end of the injecting core 361.

The rear end of the injecting core 361 is formed with a thread not shown. This threaded portion is coupled between the fuel gas passage 311 and the preheated oxygen passage 312 of the head frame 300 to form a fastening portion 311c as shown. That is, the injecting core 361 is coupled to the inner circumferential surface of the through hole formed in a shape connecting the fuel gas passage 311 and the preheating oxygen passage 312 of the head frame 300.

On the other hand, as described above, the injection cap 360 is spaced apart in front of the tip portion in which the tapered surface 361a of the injection core 361 is formed. The injecting cap 360 has a shape corresponding to the tapered surface 361a formed at the front end of the head frame 300. That is, the tapered surface 360a is formed at the rear end of the injecting cap 360, and the tapered surface 360a has a shape recessed toward the tip end direction.

Therefore, the injecting core 361 and the injecting cap 360 have a shape in which a part of the tapered surface 3601 of the injecting core 361 is inserted into a portion in which the tapered surface 360a of the injecting cap 360 is formed. Is placed.

Meanwhile, an injection passage 352 is formed at the center of the injection cap 360 in a shape penetrating the rear end portion from the front end portion in the longitudinal direction. The tip end of the injection passage 352 is disposed in the seating groove 302 of the head frame 300, and the rear end portion of the injection passage 352 is parallel to the preheated oxygen injection hole 312b of the injection core 361. Is placed.

The injection cap 360 may be coupled to the head frame 300 in a manner that is inserted into a through hole formed in the seating groove 302 of the head frame 300. At this time, although not shown, the injecting cap 360 may be coupled to the head frame 300 by welding or the like.

As described above, the injecting core 361 and the injecting cap 360 are spaced apart. Therefore, a gap is formed between the tapered surface 361a of the injecting core 361 and the tapered surface 360a of the injection cap 360, which is connected to the fuel gas chamber 311b.

The preheated oxygen flow path 361b formed at the center of the injecting core 361 is connected to the preheated oxygen flow path 312 formed at the head frame 300 at the rear end of the injection core 361. Therefore, the preheated oxygen introduced through the preheated oxygen flow passage 312 is introduced into the rear end of the injecting core 361 and injected into the preheated oxygen injection hole 312b via the preheated oxygen flow passage 361b. The preheated oxygen injected into the preheated oxygen injection hole 312b flows into the injection cap 360.

Here, the preheated oxygen injection hole 312b formed in the injecting core 361 has a smaller inner diameter than the preheated oxygen flow path 312, thereby increasing the flow rate of preheated oxygen injected through the preheated oxygen injection hole 312. This is to increase the effect that the fuel gas in the fuel gas chamber 311b is sucked between the two

tapered surfaces

361a and 360a.

That is, the tapered surface 361a of the injecting core 361 and the tapered surface 360a of the injecting cap 360 are injected by the preheated oxygen which is injected from the preheated oxygen injection hole 312b at high speed and flows into the injection flow passage 352. The low pressure is formed in the gap between the fuel cell and the fuel gas introduced into the fuel gas chamber 311b through the fuel gas flow path 311 between the two tapered surfaces 361a and 360a. 352 flows into.

The fuel gas chamber 311b is formed in a shape to surround a part of the injecting core 361 by being spaced apart from a portion where the tapered surface 361a is not formed among the outer circumferential surfaces of the injecting core 361. The volume of the fuel gas chamber 311b is formed to a size such that an appropriate amount of fuel gas may be mixed in the mixed gas in consideration of the fire power required in the fireball 349. That is, the volume of the fuel gas chamber 311b may be formed to be added or subtracted as needed, and thus the shape of the cut oxygen flow passage 313 may be changed.

Meanwhile, the preheated oxygen and fuel gas introduced into the injection passage 352 undergo laminar flow in the course of passing through the injection passage 352 and the alignment tube 370 connected thereto.

In the present embodiment, the laminar flow flows through the pipeline formed by the injecting flow passage 352 and the alignment pipe 370, and the preheated oxygen flows to the center portion and the edge portion flows through the preheated oxygen and fuel gas. Refers to the flow of fuel gas to form a layered structure without mixing with each other.

When the preheated oxygen and fuel gas flowing in the laminar flow reaches the mixing chamber having a large cross-sectional area in the process of flowing into the mixed gas passage 433 through the alignment pipe 370, the flow rate 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 alignment tube 370 and the cross-sectional area of the mixing chamber, the greater the effect of generating the vortex, and thus the mixing rate of preheated oxygen and fuel gas is increased, so that the mixed gas injected into the mixed gas injection port 435 The effect of increasing the thermal efficiency can be obtained.

Therefore, according to the fourth embodiment of the present invention, the structure in which the injecting unit is disposed in the head frame 300 does not allow the flame to flow into the alignment tube 370 even though backfire occurs during use. Since it reaches only the range indicated by BF at 21, it is possible to obtain an effect that the possibility of an accident such as explosion due to backfire or overheating of the headframe 300 is very low.

For reference, partial mixing may occur at the interface between the preheated oxygen and the fuel gas flowing in a layered structure, but a small amount of mixed gas may be generated. ) Does not have enough flammability to flow into.

That is, in the present embodiment, 'laminar flow' does not have sufficient flammability even when a portion of the preheated oxygen and fuel gas are mixed so that the flame is flowed while maintaining the layered structure so that the flame does not flow into the alignment tube 370. Say.

To this end, the length of the injection passage 352 and the alignment tube 370 may be formed to have a length such that laminar flow is maintained.

Although not shown, a diffuser portion having a shape of increasing in diameter toward the crater 449 is formed at the tip of the alignment tube 370, that is, the portion in which the alignment tube 370 is in contact with the mixing chamber, as needed. It is also possible to control the degree to which the vortex is generated during the gas flow into the mixing chamber.

On the other hand, since the fourth embodiment of the present invention is the fuel gas is sucked into the injecting flow path 352 by the high-speed injection of preheated oxygen, which is relatively higher than the fuel gas, the method depends on the supply pressure of the fuel gas Unlike the fuel gas is stably supplied, it is possible to obtain the effect of maintaining a constant thermal power.

28, the first modified example according to the fourth embodiment of the present invention includes a fuel connected to the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 in the head frame 300, respectively. The gas flow passage 311, the preheated oxygen flow passage 312, and the cut oxygen flow passage 313 are respectively formed.

Here, since the valve bundle including the fuel gas pipe 32 preheated oxygen pipe 33 and the cut oxygen pipe 34 may have the same structure as the valve bundle 2 described above, the description thereof will be omitted.

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 respectively a fuel gas flow path 311, a preheated oxygen flow path 312, and a cut oxygen flow path. Respectively through 313.

The configuration of the fastening member 500 is omitted because it is the same as the configuration and operation effects of the above-described embodiment.

The first modification of the fourth embodiment of the present invention is different from the fourth embodiment of the present invention in that a cooling passage 447 is formed in the flange portion 440a of the inner tip 440.

As shown in FIGS. 28 and 29, a cooling passage 447 is formed at the rear end surface of the tip, that is, the rear end surface of the inner tip flange portion 440a. The cooling passage 447 is formed in a groove shape through which the cutting oxygen flowing into the cutting oxygen passage 445 of the tip 400 flows through the cutting oxygen passage 313 of the head frame 300.

The cut oxygen passage 445 may include a straight cooling passage 447a and a curved cooling passage 447b. Here, the straight cooling passage 447a may be radially formed toward the edge of the flange portion 440a from the cut oxygen passage 445 disposed at the center of the flange portion 440a. The curved cooling flow path 447b is formed along the rear end edge of the flange portion 440a, and may have a shape in which ends of the straight cooling flow path 447a are connected to each other.

Therefore, in the process of cutting oxygen flowing into the cutting oxygen passage 445 of the tip 400 from the cutting oxygen passage 313 of the head frame 300, a part of the cutting oxygen is a straight cooling passage 447a and a curved cooling passage ( 447b).

At this time, since the cutting oxygen is a low temperature, when the cutting oxygen flows along the cooling flow path 447, the rear end surface of the tip 400 and the front end of the head frame 300 are in contact with the cutting oxygen is cooled. That is, even when the tip 400 is heated by the cutting operation or backfire, the heat conducted through the tip 400 is cooled by the cutting oxygen flowing through the cooling passage 447 and transferred to the head frame 300. This can be greatly reduced.

Therefore, the head frame 300 is prevented from being heated during operation, such as the tip 400, the head frame 300, the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 by heating. The rise in temperature can be suppressed.

Currently, the fuel gas pipe 32, the preheated oxygen pipe 33, and the cut oxygen pipe 34 are made of a copper alloy for preventing oxidation due to heating. The cooling action of the cooling flow path 447 as described above is used. Since oxidation can be prevented by, the material of the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34 is cheaper than the copper alloy and has excellent mechanical strength and can be replaced with a lightweight material You can get it.

The second modification according to the fourth embodiment of the present invention shown in FIG. 30 omits description of the same parts as the configuration of the above-described embodiment, and only the differences from the above-described embodiment will be described.

The head frame 300 connects the fuel gas flow path 311, the preheated oxygen flow path 312, and the cut oxygen flow path 313 to each other, and the distributor insertion hole 380a penetrates a part of the head frame 300 from the rear end toward the tip end thereof. ) Is formed, the dispenser is inserted into the dispenser insertion hole (380a). The dispenser includes a dispenser body 380.

The distributor body 380 is formed in a cylindrical shape, the cutting oxygen bypass groove 381 is formed on the outer circumferential surface of the distributor body 380. The cutting oxygen bypass groove 381 is formed in a shape embedded in the outer circumferential surface of the distributor main body 380, and is cut oxygen flow path of the outer circumferential surface of the distributor main body 380 when the distributor main body 380 is inserted into the distributor insertion hole 380a. Is formed at a position corresponding to 313.

Therefore, the part blocked by the distributor body 380 coupled to the distributor insertion hole 380a of the cutting oxygen flow passage 313 is connected through the cutting oxygen bypass groove 381, and thus cuts introduced into the cutting oxygen pipe 34. Oxygen may flow through the cut oxygen bypass groove 381a to the front end of the cut oxygen flow passage 313.

An injector 350 is installed at the front end of the distributor body 380. The injector 350 has a configuration similar to that of the embodiment described above. That is, the dispensing body 380 having the injector 350 is provided at the distal end of the dispensing insertion groove 380a of the head frame 300.

The preheated oxygen inlet hole 382 is formed in the distributor body 380, and a plurality of preheated oxygen inlet holes 382 may be formed radially from the outer circumferential surface of the distributor body 380 to the center part. Here, the preheated oxygen inflow hole 382 is formed at a position corresponding to the preheated oxygen flow path 312 of the outer peripheral surface of the distributor body 380 when the distributor body 380 is inserted into the distributor insertion hole 380a as shown. do.

On the other hand, the injecting core portion 350b is provided on the outer peripheral surface of the tip of the injector 350, and is formed in contact with the preheated oxygen flow path 311 at the center of the injecting core portion 350b. The preheated oxygen flow path 311 is formed to extend around the tip of the distributor body 380 along the center of the distributor body 380. In other words, the preheated oxygen flow path 311 is formed around the distal end portion of the distributor body 380 from the portion disposed at the center of the distributor body 380. Therefore, the preheated oxygen is injected to the tip of the distributor body 380 via the preheated oxygen flow path 311.

The head frame 300 has a shape corresponding to the injecting core part 350b and is spaced apart from the tip direction of the injecting core part 350b to correspond to the tapered surface shape of the injecting core part 350b. Towards the tapered surface of the shape recessed toward the leading end of the head frame 300 is formed.

A fuel gas chamber 311b connected to the fuel gas flow path 311 is formed around the injecting core unit 350b so that fuel gas introduced through the fuel gas pipe 32 passes through the fuel gas flow path 311 and then fuel gas. It flows into the chamber 311b.

Since the head frame 300 according to the present embodiment is very convenient in processing, the cost for manufacturing the head frame 300 can be saved. For reference, the effects on the alignment tube 370 are the same as those described with reference to FIG.

According to a third modified example of the fourth embodiment of the present invention illustrated in FIG. 31, a fuel gas connected to a fuel gas pipe 31, a preheated oxygen pipe 32, and a cut oxygen pipe 33 in the head frame 300, respectively. A flow path 311, a preheated oxygen flow passage 312 and a cut oxygen flow passage 313 are formed, respectively.

In the third modification according to the fourth embodiment of the present invention, the description of the same components as those described above will be omitted. That is, the valve bundle of the gas cutter includes a fuel gas pipe 32, a preheated oxygen pipe 33, and a cut oxygen pipe 34, and the one having the same structure as the valve bundle 2 described above may be applied.

The head frame 300 includes an injecting core 350b, an inner cap 440, and an outer cap 430, and the head frame 300 connects a fuel gas passage 311 and a preheated oxygen passage 312 to each other. Injecting core insertion hole (391) is formed in the shape to be. In addition, a cap insertion hole 392 is formed in the head frame 300 in a shape of connecting the preheated oxygen flow passage 312 and the cut oxygen flow passage 313 to each other.

As shown, the injecting core insertion hole 391 and the cap insertion hole 392 are formed to be connected to each other, the cap insertion hole 392 is formed to have a larger diameter than the injecting core insertion hole 391. The injection core 392 is inserted into the injection core insertion hole 391. A tapered surface 361a is formed at the distal end of the injecting core 361, and the tapered surface 361a is formed in a shape in which an outer diameter decreases toward the distal end of the injecting core 361.

The outer circumferential surface of the rear end of the injecting core 361 is formed in a shape corresponding to the inner circumferential surface of the injecting core insertion hole 391, and the outer circumferential surface of the injecting core 361 has a fuel gas flow path 311 and a preheating oxygen flow path. It is inserted into the injecting core insertion hole 391 so as to be arranged in a shape that blocks between the 312.

The preheated oxygen flow path 312 is formed in the injecting core 361, and the preheated oxygen flow path 312 is formed to penetrate the center of the injecting core 361 from the rear end to the front end. The preheated oxygen injection hole 312b having a diameter smaller than the preheated oxygen flow path 312 is formed at the tip end of the preheated oxygen flow path 312.

On the other hand, the inner cap 395 is inserted inside the cap insertion hole 392. The inner cap 395 has a disc shape, and the outer circumferential surface of the inner cap 395 is formed to have a shape corresponding to the inner circumferential surface of the cap insertion hole 392. The inner cap 395 is disposed in a shape to block between the preheated oxygen flow passage 312 and the cut oxygen flow passage 313 in the cap insertion hole 392.

Therefore, the preheated oxygen introduced into the preheated oxygen flow passage 312 is prevented from entering the cut oxygen flow passage 313 by the inner cap 395. The outer cap 396 is coupled in a shape to cover the cap insertion hole 392. The outer circumferential surface of the outer cap 396 is formed to have a shape corresponding to the inner circumferential surface of the rear end of the cap insertion hole 392, and the cutting oxygen flowing through the cutting oxygen flow passage 313 by the outer cap 396 is the head frame 300. ) It will not leak out.

Weld grooves are formed on the outer circumferential surface of the rear end of the injecting core 361, the outer circumferential surface of the inner cap 395, and the outer circumferential surface of the outer cap 396, respectively. The welding groove is formed in a shape that is open toward the rear end of the head frame 300.

Therefore, when the injecting core 361, the inner cap 395, and the outer cap 396 are to be coupled to the head frame 300, the tip of the head frame 300 is directed downward, that is, in the direction of gravity. Then, the injecting core 361 is seated inside the injecting core insertion hole 391, and a ring-shaped welding rod or powder-like welding material is inserted into the welding groove.

Thereafter, the inner cap 395 is inserted into the cap insertion hole 392. At this time, since the cap insertion hole 392 has a larger diameter than the injecting core insertion hole 391, a step is formed between the injecting core insertion hole 391 and the cap insertion hole 392, the inner cap 395 ) May be supported by this step and disposed inside the cap insertion hole 392. After the inner cap 395 is disposed, a ring-shaped electrode or a powdered welding material is inserted into the welding groove.

The outer circumferential surface of the outer cap 396 may be formed to be somewhat fitted to the inner circumferential surface of the cap insertion hole 392. Therefore, when the outer cap 396 is inserted into the cap insertion hole 392, the outer cap 396 can be maintained in the correct position.

After the outer cap 396 is disposed at a position covering the inlet of the cap insertion hole 392, that is, the cap insertion hole 392, a ring-shaped welding rod or a powder-like welding material is inserted into the welding groove.

Thereafter, a ring-shaped electrode or powder welding material inserted into the welding groove is welded, and as the method, ultrasonic welding or brazing may be used.

By welding the welding rod or powder in the powder state, the head frame 300, the injecting core 361, the inner cap 395 and the outer cap 396 are welded to each other and integrated. Therefore, even if the head frame 300 is heated by the heat conducted from the tip due to cutting operation or backfire, damage due to deterioration of the sealing member and the like described above does not occur, and thus fuel gas, preheating oxygen and cutting oxygen in the head frame. Can be prevented from mixing arbitrarily, and the headframe can be used semi-permanently.

In particular, the head frame 300, since the injecting core 361, the inner cap 395 and the outer cap 396 can be sequentially arranged in the head frame 300, welding can be performed, so that the head frame 300 of the head frame 300 The effect that manufacture becomes easy can be acquired.

On the other hand, the injecting cap portion is formed on the tip end side of the inside of the head frame 300 where the injecting core 361 is disposed. The injecting cap portion is spaced apart from the distal end of the injecting core 361 in the direction of the distal end of the head frame 300, and an injecting flow passage 352 is formed at the center thereof.

The periphery of the injection passage 352 has a tapered surface 360a having a shape recessed toward the front end of the head frame 300 toward the center so as to have a shape corresponding to the shape of the tapered surface 361a of the injection core 361. Is formed.

Therefore, the preheated oxygen injected into the preheated oxygen injection hole 312b at the tip of the injecting core 361 through the preheated oxygen flow passage 311 flows into the injecting flow passage 352, and thus the

tapered surfaces

360a and 361a The ambient pressure is relatively low. Therefore, the fuel gas flows into the injection passage 352 together with the preheated oxygen, and the fuel gas and the preheated oxygen flow in the injection passage 352 as described above.

32 to 41 show a gas cutter according to a fifth embodiment of the present invention.

32 and 33 is a tip used when the preheating gas is acetylene, and consists of an outer tip 430 and an inner tip 440. The inner tip 440 is disposed in a space formed in the outer tip 430 and at the same time, the inside of the tip 400 has a double tube shape in which a cutting oxygen passage 445 and a mixed gas passage 433 are formed.

The cut oxygen passage 445 is formed in the center of the inner tip 440 has a circular cross section, the front end portion of the cut oxygen passage 445 forms a cut oxygen injection port 446. The mixed gas flows through the mixed gas passage 433 between the outer tip 430 and the inner tip 440, and a tip portion of the mixed gas passage 433 forms a mixed gas injection port 434.

A horizontal circular hole 437 is formed at the distal end of the outer tip 430, and the distal end of the inner tip 440 corresponding to the circular hole 437 has the same center as the cut oxygen injection port 446. A horizontal cylindrical insert 447 having a diameter smaller than the hole 437 is formed.

Therefore, the mixed gas injection port 435 is formed by the gap between the circular hole 437 and the cylindrical insertion portion 447, and the mixed gas injection port 435 is formed in a circular shape centering on the cut oxygen injection port 446. .

In addition, the cylindrical insertion portion 447 is inscribed in the circular hole 437 of the outer tip 430 on the circumference having the same center as the cylindrical insertion portion 447 on the outer circumferential surface of the position spaced apart from the end by a certain length A gas flow port 448 is formed, and the mixed gas flow port 448 is configured such that a plurality of protrusions 448a are formed at equal intervals to have a space 448b.

As shown in FIG. 34, the outer peripheral surface of the cylindrical insert 447 is automatically inserted by inserting the cylindrical insert 447 of the inner tip 440 into the circular hole 437 of the outer tip 430. The gap between the inner circumferential surface of the circular hole 437 is kept constant in the circumferential direction, and can be assembled by matching the center position of the mixed gas jet port 435 formed with this gap with the center of the cut oxygen jet port 446. have.

Accordingly, when the cutting oxygen is supplied from the cutting oxygen flow passage 313 of the cutting oxygen pipe 34 to the center of the rear end surface of the tip 400, the cutting oxygen passes through the cutting oxygen passage 445 of the inner tip 440. The fuel gas and the preheated oxygen injected into the cutting oxygen injection port 446 of the fuel gas pipe 32 and the preheated oxygen flow path 312 of the preheated oxygen pipe 33 are connected to the head frame 300. ) And mixed gas flows into the mixed gas passage 433 to the mixed gas injection hole 435 through the space 448b between the protrusions 448a constituting the mixed gas flow port 448. Inflow is injected from the mixed gas injection port (435).

This will be described in detail with reference to FIGS. 35 and 36. FIG. 35 is a cross-sectional view illustrating a state in which the mixed gas flow holes 448 are formed in the cylindrical insertion portion 447 of the inner tip 440, and the plurality of protrusions 448a constituting the mixed gas flow holes 448 are outside. It is inscribed in a circular hole 437 of the tip 430, and a space 448b is formed between each of the protrusions 448a and is supplied to the mixed gas passage 433 through the space 448b. The mixed gas flows into the mixed gas injection port 435.

36 is a cross-sectional view of the distal end of the outer tip 430 and the inner tip 440, the crater 449 is formed by the cutting oxygen injection port 446 and the mixed gas injection port (435). As described above, the cutting oxygen injection sphere 446 is disposed in the center of the inner tip 440, the mixed gas injection sphere 435 is disposed around the cutting oxygen injection sphere 445 is formed in the same center as a circle, When the mixed gas injected into the mixed gas injection port 435 is ignited to sufficiently heat the workpiece, and the cutting oxygen is injected through the cut oxygen injection port 446, the workpiece is oxidized to cut the workpiece.

In addition, in the present invention, it is preferable that the plurality of protrusions 448a be formed in a polygon inscribed in a circular hole 437 of the outer tip 430. In the present embodiment, as an example of a polygon, six projections 448a and six spaces 448b inscribed in the inner circumferential surface of the circular hole 437 are formed by forming a hexagon.

Further, the plurality of protrusions 448a are positioned at the end portions of the mixed gas passage 433 side of the circular hole 437, and the length of the mixed gas injection hole 435 is longer than or equal to the outer diameter of the mixed gas injection hole 435. It is preferable to form it. When the length of the mixed gas injection port 435 is shorter than the outer diameter, the injection pressure of the mixed gas is lowered, so that the flame formed during ignition spreads widely, thereby lowering preheating performance. Therefore, the length of the mixed gas injection port 435 is longer than or equal to the outer diameter, it is preferable to maintain the preheating performance by preventing the flame formed during ignition spread.

32 and 33, when the cylindrical insert 447 of the inner tip 440 is fitted into the circular hole 437 of the outer tip 430, the assembly shown in FIG. As shown in 35, a plurality of protrusions 448a formed in the cylindrical insertion portion 447 are inscribed in the circular holes 437, and the cylindrical portions of the circular holes 437 and the inner tip 440 of the outer tip 430 are automatically inscribed. A uniform gap is formed between the insertion portions 447.

As shown in FIG. 36, the center of the mixed gas injection port 435 formed by the gap coincides with the center of the cut oxygen injection port 446 formed at the center of the inner tip 440. The cross section is formed in a circular shape, the assembly is simplified to minimize the center deviation of the cutting oxygen injection sphere 446 and the mixed gas injection sphere 435 due to the assembly error.

Therefore, the mixed gas supplied to the mixed gas passage 433 is injected into the mixed gas injection port 435 along the space 448b formed by the plurality of protrusions 448a constituting the mixed gas flow port 448, It is possible to maintain a uniform flame and pressure in the circumferential direction around the cutting oxygen injection sphere 446, thereby improving the preheating performance and cutting performance.

In addition, even when the foreign matter is caught in the mixed gas injection port 435 by mixing the simple action of disassembling the outer member 430 and the inner tip 440 by loosening the fastening member 500 screwed to the head frame 300. Since the gas injection port 435 is exposed, foreign matter removal is made very convenient.

On the other hand, Figure 37 is a cross-sectional view showing a modified example of the head of the gas cutter tip is assembled, Figure 38 is an exploded perspective view of the tip for the manual gas cutter shown in Figure 37, the same as the configuration in the embodiment described above The same code is used for the same reference numeral.

As described above, the tip 400 for the gas cutter consists of the outer tip 430 and the inner tip 440, the inner tip 440 is disposed in the space formed in the outer tip 430 and at the same time the tip 400 The inside of the cut oxygen passage 445 and the mixed gas passage 433 is formed.

The cut oxygen passage 445 is formed in the center of the inner tip 440 has a circular cross section, the front end portion of the cut oxygen passage 445 forms a cut oxygen injection port 446. The mixed gas flows through the mixed gas passage 433 between the outer tip 430 and the inner tip 440, and a tip portion of the mixed gas passage 433 forms the mixed gas injection port 435.

In addition, the cylindrical insert 447 is inscribed in the circular hole 437 of the outer tip 430 on the circumference having the same center as the cylindrical insert 447 on the outer circumferential surface of the position spaced at a certain length from the end A gas flow port 448 is formed, and the mixed gas flow port 448 includes a plurality of protrusions 448c and grooves 448d.

As shown in FIG. 39, by inserting the cylindrical insertion portion 447 of the inner tip 440 into the circular hole 437 of the outer tip 430, the outer peripheral surface of the cylindrical insertion portion 447 is automatically The gap between the inner circumferential surface of the circular hole 437 is kept constant in the circumferential direction, and can be assembled by matching the center position of the mixed gas jet port 435 formed with this gap with the center of the cut oxygen jet port 446. have.

Accordingly, when the cutting oxygen is supplied from the cutting oxygen flow passage 313 of the cutting oxygen pipe 34 to the center of the rear end surface of the tip 400, the cutting oxygen passes through the cutting oxygen passage 445 of the inner tip 440. The fuel gas and the preheated oxygen injected into the cutting oxygen injection port 446 of the fuel gas pipe 32 and the preheated oxygen flow path 312 of the preheated oxygen pipe 33 are connected to the head frame 300. Mixed within).

After the mixed gas flows into the mixed gas passage 433, the mixed gas flows into the mixed gas injection port 435 through the grooves 448d between the projections 448c constituting the mixed gas flow port 448 and enters the mixed gas injection port ( 435.

This will be described in detail with reference to FIGS. 40 and 41. 40 is a cross-sectional view showing a state in which the mixed gas flow port 448 is formed in the cylindrical insertion portion 447 of the inner tip 440. The mixed gas flow port 448 has a plurality of protrusions 448c having an outer tip ( 440 is inscribed in a circular hole 437, and a groove 448d is formed between the projections 448c, and the mixed gas supplied to the mixed gas passage 433 through the grooves 448d. May be linearly introduced into the mixed gas injection port (435).

41 is a cross-sectional view of the distal end portion of the outer tip 430 and the inner tip 440. As described above, the crater 449 is formed by the cutting oxygen injection port 446 and the mixed gas injection port 435. The cutting oxygen injection port 446 is disposed at the center of the inner tip 440, and the mixed gas injection hole 435 is disposed around the cutting oxygen injection port 446 and is formed in a circular shape with the same center.

Accordingly, when the mixed gas injected into the mixed gas injection port 435 is ignited to sufficiently heat the workpiece, and the cutting oxygen is injected through the cutting oxygen injection port 446, the workpiece is oxidized to cut the workpiece. .

Further, the mixed gas flow port 448 is located at the end of the circular hole 437 on the side of the mixed gas passage 433, and the length of the mixed gas injection port 435 is longer than the outer diameter of the mixed gas injection port 435. It is preferable to form similarly.

When the length of the mixed gas injection port 435 is shorter than the outer diameter, the injection pressure of the mixed gas is lowered, so that the flame formed during ignition spreads widely, so that the preheating performance may be lowered. It is better to make it longer or the same so that the flame formed during ignition does not spread.

Gas cutter tip 400 of the present invention having such a configuration, when the cylindrical insertion portion 447 of the inner tip 440 is assembled into the circular hole 437 of the outer tip 430, as shown in FIG. Likewise, the projections 448c of the mixed gas flow holes 448 formed in the cylindrical insertion portion 447 are automatically inscribed in the circular holes 437 and the circular holes 437 and the inner tips 440 of the outer tip 430 are automatically inscribed. A uniform gap is formed between the cylindrical inserts 447.

In addition, as shown in FIG. 41, the center of the mixed gas injection port 435 formed by the gap coincides with the center of the cut oxygen injection port 435 formed at the center of the inner tip 440, and the mixed gas injection port 435 ) Has a circular cross section, and the assembly is simplified to minimize the center deviation of the cutting oxygen injection sphere 435 and the center of the mixed gas injection sphere 435 due to the assembly error.

Therefore, the mixed gas supplied to the mixed gas passage 433 is injected into the mixed gas injection port 435 through the grooves 448d formed by the plurality of protrusions 448c, and thus the mixed gas does not flow, and cutting is performed. Since it is possible to maintain a uniform flame and pressure around the oxygen injection port 446, it is possible to improve the preheating performance and cutting performance.

In addition, even when the foreign matter is caught in the mixed gas injection port 435 by mixing the simple action of disassembling the outer tip 430 and the inner tip 440 by releasing the fastening member 500 screwed to the head frame 300. Since the gas injection port 435 is exposed, foreign matter removal is made very convenient.

The embodiments described so far are merely illustrative of the preferred embodiments of the present invention, and the scope of the present invention is not limited to the described embodiments, and those skilled in the art within the technical spirit and claims of the present invention. It will be understood that various changes, modifications, or substitutions may be made thereto, and such embodiments are to be understood as being within the scope of the present invention.

According to the present invention, even when the fuel gas is acetylene in the gas cutting machine, by providing a tip structure suitable for this, the acetylene combustion gas can be prevented from being backfired to stably cut the workpiece, thereby promoting the development of technology and contributing to industrial development. can do.

Claims

A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head may include a head frame including a fuel gas flow passage, a preheating oxygen flow passage, and a cutting oxygen flow passage, and a mixing space part in which fuel gas flowing through the fuel gas flow passage and preheating oxygen flowing through the preheating oxygen flow passage are mixed with each other;

A tip having an outer tip and an inner tip connected to the mixing space of the head frame and having a mixed gas passage through which mixed gas is introduced and a cutting oxygen passage connected with a cutting oxygen flow path of the head frame to introduce cutting oxygen; And

It includes a fastening member for coupling the head frame and the tip,

The mixing space of the head frame is formed in a cylindrical shape in which the cutting oxygen flow path is located at the center, and the inner tip is formed in a tubular shape so that the inside thereof becomes the cutting oxygen flow path, and the upper end of the inner tip is cut oxygen flow path of the head frame. The cutting oxygen passage of the inner tip and the cutting oxygen flow path of the head frame are coupled to each other, and the mixing space portion is formed by a space between an inner circumference of the mixing space and an outer circumference of the inner tip. Gas cutter.
The gas cutting machine according to claim 1, wherein the size of the cross section of the portion where the mixing space of the head frame and the mixed gas passage of the tip are connected is the same or the size of the cross section is minimized.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head has a fuel gas flow path, a preheated oxygen flow path and a cut oxygen flow path, and a head having an injection flow path for supplying fuel gas flowing through the fuel gas flow path and preheated oxygen flowing through the preheated oxygen flow path. frame;

A tip having a mixed gas passage through which the mixed gas from the head frame flows and a cutting oxygen passage through which the cutting oxygen flows in connection with the cutting oxygen flow path of the head frame; And

It includes a fastening member for coupling the head frame and the tip,

The inner tip is formed in a tubular shape to have a cutting oxygen passage and at the same time the upper end of the inner tip is coupled to the cutting oxygen passage of the head frame so that the cutting oxygen passage and the cutting oxygen passage are connected, and the injection passage formed in the head frame is Gas cutter, characterized in that configured to be connected to the mixed gas passage of the outer tip.
The gas cutter according to any one of claims 1 to 3, wherein the coupling between the inner tip and the head frame constituting the tip is made by screwing or fitting each other.
According to any one of claims 1 to 3, Combination of the inner tip of the tip and the head frame, the upper end of the inner tip in close contact with the bottom of the head frame, a portion away from the upper end of the inner tip And a flange portion which is supported in contact with the inner circumferential surface of the head frame, wherein the flange portion has a plurality of through holes for circumferentially communicating the mixing space portion and the mixed gas passage.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head may include a head frame including a fuel gas flow passage, a preheating oxygen flow passage, and a cutting oxygen flow passage, and a mixing space part in which fuel gas flowing through the fuel gas flow passage and preheating oxygen flowing through the preheating oxygen flow passage are mixed with each other;

A tip having an outer tip and an inner tip connected to the mixing space of the head frame and having a mixed gas passage through which mixed gas is introduced and a cutting oxygen passage connected with a cutting oxygen flow path of the head frame to introduce cutting oxygen; And

It includes a fastening member for coupling the head frame and the tip,

Gas cutting machine, characterized in that the cross-sectional area size of the portion where the mixing space of the head frame and the mixed gas passage of the tip is the same or formed so as to minimize the difference in the cross-sectional area size.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head includes a fuel gas flow path, a preheated oxygen flow path, and a cut oxygen flow path, and an injecting part for laminar flow of fuel gas and preheated oxygen flowing through the fuel gas flow path and the preheated oxygen flow path through an injecting flow path. One headframe;

A mixed gas passage formed of an outer tip and an inner tip and formed by a space between the outer tip and the inner tip and connected to the injection passage of the head frame, and formed at the center of the inner tip to cut the head frame. A tip having a cut oxygen passage connected to the oxygen passage; And

It includes a fastening member for coupling the head frame and the tip,

An insertion groove is formed at the rear end of the outer tip of the tip, and an insertion protrusion is formed at the rear end of the inner tip so that the inner tip is assembled at a predetermined position with respect to the outer tip.

By the space between the outer tip and the inner tip except the insertion protrusion of the inner tip, the injection flow path of the head frame and the mixed gas passage of the tip and at the same time pre-heated by laminar flow flow in the injection flow path A flashback preventing gas cutter, characterized in that a mixing chamber is formed in which oxygen and fuel gas are mixed.
The method of claim 7, wherein the head frame and the inner tip is in contact with the cutting oxygen flow path and the cutting oxygen communication path, the inner tip is formed with an inclined contact surface and the head frame is formed with an inclined contact groove in close contact with the inclined contact surface Flashback gas cut, characterized in that.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head has a fuel gas flow path, a preheated oxygen flow path, and a cut oxygen flow path, respectively, and an injector and an injecting flow path for circulating the fuel gas flowing through the fuel gas flow path and the preheated oxygen flowed through the preheated oxygen flow path. And the injecting flow passage comprises a head frame formed with a flat bottom surface and a recess formed in the bottom surface thereof with a groove connected to the cutting oxygen flow passage.
10. The method of claim 9, wherein the upper end of the inner tip having a cutting oxygen passage is inserted into the groove formed on the bottom surface of the head frame, the upper end of the outer tip having a mixed gas passage around the inner tip of the head frame The gas cutter, characterized in that the close contact with the bottom surface is bound by the fastening member.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head has an injector mounted on the preheated oxygen pipe and fuel gas pipe constituting the nozzle bundle, and a mixed gas pipe for supplying the mixed gas generated by flowing from the injector is bound to the head frame, and the head frame has a cutting oxygen flow path. And a mixed gas passage formed to be connected to the cutting oxygen passage and the mixed gas passage of the tip, respectively, and the cross-sectional area of the mixed gas pipe of the nozzle bundle is the same as the cross-sectional area of the mixed gas passage formed in the head frame or the difference in size of the cross-sectional area is minimized. The head of the gas cutter, characterized in that formed so as to.
12. The head of the gas cutter as set forth in claim 11, wherein the cross section of the mixed gas passage of the head frame and the mixed gas passage formed at the tip is the same or the cross section size is minimized.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The valve bundle has a flow path for flowing the fuel gas, including the cutting oxygen and preheated oxygen, respectively,

The nozzle bundle includes a tip and the head frame is coupled to the tip is formed craters,

Inside the head frame is a cutting oxygen flow path in which the cutting oxygen introduced from the valve bundle flows to the tip, an injection flow path in which the preheated oxygen and the fuel gas flows from the valve bundle flows to the tip; Injectors are formed to increase the flow rate of the preheated oxygen flowing into the injecting oil so that the fuel gas is laminar flow through the injecting flow passage,

A rear end of the tip is formed with a cutting oxygen inlet hole connected to the cutting oxygen flow path and an inlet hole connected to the injecting flow path, respectively, and inside the tip, the preheated oxygen and the fuel flowed through the laminar flow from the inlet hole. A mixing chamber having a larger cross-sectional area than the inlet is formed so that the gas forms a vortex to produce a flammable mixed gas.

One end of the alignment tube is fixed to one of the injecting flow path of the head frame or the mixed gas inlet of the tip, and when the head frame and the tip are combined, the exposed end of the alignment pipe is injected into the other injection flow path or the mixed gas inflow. And a gas cutter configured to match the center of the injection gas inlet of the head frame and the mixed gas inlet hole of the tip by fitting into the ball.
The gas cutting machine according to claim 13, wherein the alignment tube is fixed to the injection passage of the head frame, and the inner diameter of the injection passage and the inner diameter of the alignment tube are set to be the same.
The gas cutting machine according to claim 13 or 14, wherein the alignment tube includes a packing fitted to an outer circumference thereof, and the tip has a packing groove into which the packing is inserted.
A gas cutter having a valve bundle in which gaseous oxygen and fuel gas flow, and a nozzle bundle and a head bound to the valve bundle,

The head has a mixed gas flow path formed between the inner tip and the inner tip having a cutting oxygen injection port forming a cutting oxygen flow channel at the center and ejecting cutting oxygen at the distal end of the cutting oxygen flow path. To form, and comprises a tip consisting of an outer tip to form a mixed gas injection port for ejecting the mixed gas to the front end of the mixed gas flow path,

A circular hole penetrating in the horizontal direction is formed at the tip end of the outer tip forming the mixed gas injection port, and the tip of the inner tip corresponding to the circular hole has the same center as the cut oxygen injection port. And a cylindrical insertion portion having a diameter smaller than that of the circular hole, and the cylindrical insertion portion is inscribed in a circular hole of the outer tip on the circumference centering the cylindrical insertion portion on an outer circumferential surface of a position spaced a predetermined length from the end. Gas cutting machine, characterized in that is formed.
17. The gas cutting machine according to claim 16, wherein the mixed gas flow port has a plurality of protrusions and spaces and is formed in a polygon and inscribed in a circular hole of the outer tip.
The gas cutting machine according to claim 16, wherein the mixed gas flow opening comprises a protrusion inscribed in a circular hole of the outer tip, and a groove formed around the protrusion.
19. The gas according to any one of claims 16 to 18, wherein the mixed gas flow port is located at the end of the mixed gas flow path, and the length of the mixed gas injection port is longer than or equal to the outer diameter of the mixed gas injection port. cutter.