KR20140146554A - Gas cutting torch - Google Patents

Abstract

An objective of the present invention is to provide a manual gas cutter wherein a work of coupling an injecting flow channel of a head frame to an injecting gas introduction hole of a tip by corresponding the two to be in communication with each other is very promptly and conveniently performed by an unskilled person, mixing of mixed gas and cutting oxygen is prevented, and high-temperature heat transferred to a cutting oxygen flow channel of the head frame through the cutting oxygen flow channel is delayed, thereby preventing the head frame from being overheated. The manual gas cutter fixes one end of an aligning pipe at one side of either the injecting flow channel of the head frame or the injecting gas introduction hole of the tip, enables center portions of the injecting flow channel of the head frame and the injecting gas introduction hole of the tip to correspond to each other by fitting an exposed end of the aligning pipe into the injecting flow channel or injecting gas introduction hole at the other side when coupling the head frame to the tip, has the cutting oxygen flow channel disposed at the center portion of the tip, and has a connecting flow channel formed toward the outside in a radial direction from the cutting oxygen flow channel formed at a rear cross-section of the tip, wherein the connecting flow channel is configured to enable the cutting oxygen flow channel of the head frame to be in communication with the cutting oxygen flow channel of the tip.

Description

[0001] GAS CUTTING TORCH [0002]

The present invention relates to a manual gas cutting machine, and more particularly, to a manual gas cutting machine for heating a workpiece with a preheating flame and blowing off oxygen to cut the workpiece.

The manual gas cutter is generally provided with a cutter for ejecting gas and flame at the tip thereof, and a cutter for blowing cut oxygen to the center of the cutter and a preheating flame for preheating the cutter around the cutter. Here, the preheating flame is formed by igniting a mixed gas generated by mixing oxygen and fuel gas in a gaseous state supplied to a gas cutter.

Conventional manual gas cutting machines use a torch mixing method and a nozzle (kiln) mixing method according to the mixing method of oxygen and fuel gas to form a preheating flame. This is done by using a 1-type cutter and a 3-type cutter according to KS B4601 .

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

The manual gas cutter of the torch mixing type is likely to cause flame to enter into the valve bundle in which the mixed gas is generated when the backfire occurs, and when the backfire occurs, There is a high possibility that it may lead to an accident such as a rupture.

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

The manual gas cutter of the nozzle mixing method is advantageous in that the possibility of occurrence of backfire is lowered, but it is difficult to stably supply the fuel gas having relatively lower pressure than oxygen, so that it takes a long time to preheat the workpiece . In order to compensate for this, there is a drawback that when the pressure of the fuel gas is increased, the risk of accidents becomes high when backfire occurs.

In order to solve the disadvantages of the torch mixing method and the nozzle mixing method as described above, the applicant of the present invention has proposed an injection method in which a mixed gas is generated through a conventional method (hereinafter referred to as " prior art " A so-called " head mixing type " torch head disposed in the head of the additional manual gas cutter has been proposed.

The head mixing method according to the prior art has an advantage that an occurrence of backfire is minimized and an explosion force is considerably lowered even if backfire occurs and an accident or noise is minimized because the ejecting portion is disposed in the head. The fuel gas is supplied stably by applying the injector method in which the fuel gas is sucked in accordance with the injection of the preheated oxygen at high pressure, thereby shortening the preheating time of the material to be processed.

However, the manual gas cutting machine to which the head mixing method according to the prior art is applied is configured such that the tip and the ejecting gas injection hole formed in the head are aligned so as to communicate with each other and then joined by a nut, It is difficult for the skilled worker to accurately match the injecting gas injection holes with each other. However, there is a disadvantage in that it is not easy for an expert to accurately match the injecting gas injection holes.

Further, since the mutually facing surfaces of the head and the tip are in close contact with each other due to the tightening force of the nut, even if both injecting gas injection holes are precisely matched to each other and used for a long time, the nut is finely loosened, So that the supply of the mixed gas can not be smoothly performed, and a fine gap is formed between the contact surface of the head and the crusher, thereby maintaining the airtightness between the injecting gas injection hole and the cutting oxygen hole There is no problem.

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

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems in the prior art, and it is an object of the present invention to provide a head frame, The present invention also provides a manual gas cutter that can be quickly and conveniently operated by an unskilled person.

Further, according to the present invention, it is possible to prevent the tip from flowing to the head frame even when used for a long time, thereby preventing the communicating injecting flow path and the injecting gas inflow hole from being displaced from each other, And a passive gas cutter capable of preventing mixing of the mixed gas flowing in the cutoff oxygen flow path and the cutoff oxygen.

In addition, the present invention is characterized in that a connection channel is formed between the cut-off oxygen flow path of the head frame and the cut-off oxygen flow path of the tip to delay the transfer of the high heat to the cutoff oxygen flow path of the head frame through the cut- And to provide a passive gas cutting machine capable of preventing as much as possible.

According to an aspect of the present invention, there is provided a head frame including a cutoff oxygen passage and an ejecting passage provided in a head frame, a cutoff oxygen passage provided in the tip and an injecting gas inflow hole communicating with each other, And a head coupled to the tip of the head so as to be brought into close contact with each other by a tightening force of a fastening member, the manual gas cutter comprising: And the tip end of the aligning tube is engaged with the other of the ejecting channel or the injecting gas inlet hole when the head frame and the tip are coupled to each other, It features a manual gas cutter to match the center of the ball.

Further, the present invention is characterized in that the aligning tube is fixed to the ejecting channel of the head frame, and the inner diameter of the ejecting channel and the inner diameter of the aligning tube are set to be the same.

Further, the present invention is characterized by a manual gas cutter having a packing fitted to the outer periphery of the aligning tube, and the tip has a packing groove into which the packing is inserted.

In addition, the present invention is characterized in that the tip is composed of an outer tip and an inner tip, a mixed gas flow path is formed between the outer tip and the inner tip, and the outer tip and the inner tip are inserted into the fastening member, Wherein each of the flange portions has the same outer diameter and the coupling member is provided with an alignment hole which is inserted and received together with the flange portions overlapping each other.

Further, according to the present invention, the cutoff oxygen flow path and the ejecting flow path provided in the head frame, the cutoff oxygen flow path provided in the tip, and the injecting gas inflow hole are communicated with each other to be coupled by a fastening member, A cutting gas channel is disposed at the center of the tip and a connection formed radially outward from the cut oxygen channel is formed at the rear end face of the tip, And the connecting passage is characterized by a manual gas cutter for causing a cut-off oxygen flow path of the head frame and a cut-off oxygen flow path of the tip to communicate with each other.

According to the present invention having such a characteristic configuration, an alignment tube fixed to one of the ejecting channel of the head frame and the ejecting gas introducing hole of the tip is inserted into the other ejecting channel or the ejecting gas The injecting flow path of the head frame and the center of the injecting gas inflow hole of the tip can be exactly matched with each other by a simple operation of fitting the inflow hole, Can be performed very quickly and conveniently even if the operator is not skilled, and the tip can be prevented from flowing to the head frame by the aligning tube, so that the ejecting channel and the ejecting gas inflow hole can be displaced Thus, it is possible to smoothly supply the gas.

Further, according to the present invention, there is provided a gasket for a gasket, comprising a packing fitted to an outer periphery of an alignment pipe, and a packing groove into which the packing is inserted is formed on an injection gas inflow hole side of the tip, It is possible to maintain the airtightness between the head frame or the tip provided with the nozzle and to maintain the airtightness between the cut-off oxygen flow path and the injecting gas inflow hole even when a minute gap is formed between the head frame and the tip due to long- .

Further, according to the present invention, since the inner tip constituting the tip and the flange portion formed on the outer tip are sandwiched together in an overlapping manner in the alignment hole of the fastening member, the inner tip So that the assembling property of the tip is improved, and the gas passages in the circumferential direction are uniformly arranged in a concentric circular shape, so that the flow of the gas is smoothly maintained.

Further, according to the present invention, a connection channel is formed in an outer radial direction from a cut-off oxygen flow channel disposed at the center of the tip, and the cut-off oxygen channel of the head frame and the cut- It is a useful invention that can prevent the head frame from being overheated by delaying the heat transfer through the connection passage than when the high temperature is directly transmitted to the cutoff oxygen passage of the head frame.

1 is a front view of a manual gas cutter according to the present invention;
2 is a cross-sectional view of a valve assembly in a manual gas cutter according to the present invention.
3 is a sectional view showing the head of the nozzle bundle in the manual gas cutting machine of the present invention.
Figure 4 is an exploded cross-sectional view of the head shown in Figure 3;
5 is an exploded perspective view showing the tip in Fig. 3;
Fig. 6 is a side view showing the tip of the tip in Fig. 3; Fig.
FIG. 7 is a side view showing the rear end of the tip in FIG. 3; FIG.
8 is a side view showing a front end portion of the head frame in Fig. 3;
9 is a cross-sectional view of a head of another embodiment in the manual gas cutter of the present invention.
10 is an exploded cross-sectional view of the head shown in Fig.
11 is an exploded perspective view showing the tip in Fig.
12 is a side view showing the tip of the tip in Fig.
13 is a side view showing the rear end of the tip in Fig.

Hereinafter, a preferred embodiment of a manual gas cutter according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a manual gas cutter according to the present invention. As shown in FIG. 1, a manual gas cutter 1 includes a valve assembly 2 and a nozzle assembly 3 connected thereto.

The valve assembly 2 is a portion into which gaseous oxygen and fuel gas are introduced and has a supply port frame 21, a handle portion 22 and a valve frame 23.

The nozzle bundle 3 has a head 35 and a neck 31 connecting the head 35 to the valve bundle 2. [

The head 35 is composed of a tip 300 having a tip end portion (349 in Fig. 3) formed therein, a head frame 320, and a fastening member 310 coupling the tip 300 and the head frame 320. The neck 31 includes a fuel gas pipe 32, a preheated oxygen pipe 33, and a cut oxygen pipe 34. The neck 31 connects the head frame 320 and the valve frame 23 as shown.

For reference, the tip 300 having the cutter 349 may have a shorter lifetime than the head frame 320 because a large amount of heat is applied to the tip 300 and foreign materials such as metal oxide scattered may adhere thereto . In addition, the thermal power required for the cutting operation may differ depending on the physical properties of the material to be cut (not shown). Accordingly, it is preferable that the tip 300 is detachably coupled to the head frame 320 so that the tip 300 can be used as needed.

FIG. 2 is a sectional view of a valve bundle of the manual gas cutter shown in FIG. 1, and the valve bundle 2 will be described with reference to FIGS. 1 and 2. FIG.

A fuel gas supply port 211 and an oxygen supply port 213 are formed in the supply port frame 21 of the valve assembly 2 so as to supply the fuel gas and the flow rate of the fuel gas through the fuel gas supply port 211 A fuel gas control valve 25 is provided. The rear end of the handle portion 22 is engaged with the supply port frame 21.

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

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

The distal end portion of the handle portion 22 is engaged with the valve frame 23.

As shown in the figure, a passage through which oxygen flows from the handle portion 22 is formed in the valve frame 23, and the oxygen introduced through the oxygen flow path 223 is branched into cutoff oxygen and preheated oxygen 231 are formed.

The oxygen introduced into the valve frame 23 through the oxygen flow path 223 branches at the branching section 231 and flows into the cut oxygen pipe 34 and the preheated oxygen pipe 33 respectively.

A cutoff oxygen control valve 27 is provided at a portion of the valve frame 23 where the branched portion 231 is formed to control the amount of cutoff oxygen introduced into the cutoff oxygen pipe 34, The oxygen flow path is provided with a preheating oxygen control valve 26 for regulating the amount of preheated oxygen introduced into the preheated oxygen pipe 34.

Therefore, by controlling the fuel gas regulating valve 25, the preheating oxygen regulating valve 26 and the cutting oxygen regulating valve 27, it is possible to control the flow rate of the fuel gas flowing through the fuel gas pipe 32, the preheating oxygen pipe 33 and the cut oxygen pipe 34 The amount of fuel gas, the amount of preheated oxygen, and the amount of cut oxygen, respectively.

The fuel gas, the preheated oxygen, and the cut oxygen flow into the head frame 320 through the neck 31, which will be described with reference to Figs. 3 to 6.

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

3 is a sectional view of the head in the manual gas cutter shown in Fig. 1, and Fig. 4 is an exploded cross-sectional view of the head shown in Fig. 3 and Fig. 4 together. Fig.

3 and 4, the head frame 320 includes a fuel gas flow path 324, a preheated oxygen flow path 325, and a fuel gas flow path 322 connected to the fuel gas pipe 32, the preheated oxygen pipe 33 and the cut oxygen pipe 34, And a cutoff oxygen flow path 326 are formed.

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

An insertion hole 311 is formed through the fastening member 310, and a threaded portion 312 is formed on an inner peripheral surface of the fastening member 310.

The threaded portion 322 of the head frame 320 is formed in a shape corresponding to the threaded portion 312 of the fastening member 310. The threaded portion 322 of the head frame 320 is formed on the outer peripheral surface of the distal end portion of the head frame 320.

3 by fastening the threaded portion 312 of the fastening member 310 and the threaded portion 322 of the head frame 320 to the rear end of the head frame 320 And can be seated and fixed in the seating groove 321 formed at the distal end.

When the tip 300 is coupled to the head frame 320 by the fastening member 310, the tip 300 penetrates through the insertion hole 311 and protrudes toward the distal end of the fastening member 310.

The tip 300 includes an outer tip 330 and an inner tip 340 that are disposed in a space formed within the outer tip 330 so that the interior of the tip 300, Has a double pipe shape in which a cutoff oxygen flow path (345) and a mixed gas flow path (333) are formed.

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

The flange portion 341 of the inner tip 340 and the flange portion 331 of the outer tip 330 are formed to have the same outer diameter and a portion of the flange portion 341 of the inner tip 340 is formed to have the same diameter as that of the head frame 320 So that it is inserted into the seating groove 321.

3, when the tip 300 is fixed to the head frame 320 by the fastening member 310, a part of the flange portion 341 of the inner tip 340 is inserted into the seating groove 321 And the flange portion 331 of the outer tip 330 is pressed by the fastening member 310 in a state overlapping with the flange portion 341 of the inner tip 340. [

A flange portion 331 of the outer tip 330 and a flange portion 341 of the inner tip 340 are partially overlapped between the insertion hole 311 and the threaded portion 312 of the fastening member 310 The alignment hole 313 is formed in the flange portion of the outer tip 330 when the tip 300 is coupled to the head frame 320 331 and the flange portion 341 of the inner tip 340 are inserted into the alignment hole 313 so that the centers of the outer tip 330 and the inner tip 340 are automatically aligned. Therefore, the assembling property of the tip 300 can be improved, and the gas flow in the circumferential direction can be made uniform in a concentric manner, so that the flow of gas can be smooth.

An injecting gas inflow hole 342 is formed in the flange portion 341 of the inner tip 340 and a rear end face of the flange portion 331 of the outer tip 330 is connected to the flange portion 341 of the inner tip 340, The injection gas inflow hole 342 is formed to be connected to the mixed gas flow path 333.

5, the outer diameter of the outer tip 330 and the outer diameter of the inner tip 340 have shapes that decrease toward the distal end. A cut oxygen passage 345 is formed in the inner tip 340 so as to penetrate the distal end portion from the rear end and a tip end of the cut oxygen passage 345 forms a cutoff oxygen injection hole 346.

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

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

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

Therefore, when cutting oxygen is supplied to the center of the rear end surface of the tip 300, the cut oxygen is injected into the cutoff oxygen injection port 346 through the cutoff oxygen flow path 345 and the mixed oxygen introduced into the injecting gas inflow hole 342 The gas is injected into the mixed gas injection port 347 between the through hole 332 and the slit 344 through the slit 344 through the mixed gas flow path 333. This will be described with reference to FIG.

FIG. 6 is a side view showing the tip of the tip in FIG. 3. Referring to FIG. 6, the cutter 349 is formed by the cutoff oxygen injection port 346 and the mixed gas injection port 347.

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

The mixed gas injection port 347 is formed by a slit 344 in FIG. 5, and is filled with a mixed gas injected into the mixed gas injection port 347 to sufficiently heat the material to be processed (not shown) When cutting oxygen is injected through the injection port 346, the material to be processed (not shown) is oxidized and cutting of the material to be processed (not shown) can be performed.

7 is a side view showing a rear end portion of the tip in FIG. 3, wherein the rear end portion of the cut oxygen passage 345 is disposed at the center rear portion of the flange portion 341 of the inner tip 340, A connection channel 348 is formed in the outer radial direction of the flange portion 341 from the connection groove 345. The connection channel 348 is connected to the cutoff oxygen flow path 326 of the head frame 320 and the inner tip 340, The cut-off oxygen flow path 345 is communicated. An injection gas inflow hole (342 in FIG. 3) is disposed at the edge of the cutoff oxygen flow path 345.

That is, as described above, in order to inject the cutting oxygen into the cutting oxygen injection port 346 and inject the mixed gas into the mixed gas injection port 347, cutting oxygen must be supplied to the cutting oxygen flow path 345, The injecting gas must flow into the hole 342.

The connection passage 348 is connected to the connection passage 348 through the cutoff oxygen passage 345 of the tip 300 and the heat transfer is performed through the connection passage 348 rather than when the high heat is directly transferred to the cutoff oxygen passage 326 of the head frame 320. [ Thereby preventing the head frame 320 from overheating.

Fig. 8 shows a front end portion of the head frame 320 shown in Fig.

Referring to Fig. 8, the front end of the cut-off oxygen flow path 326 and the tip end of the ejecting flow path 362 are disposed in the seating groove (321 in Fig. 4) formed at the tip end portion of the head frame 320. Fig.

At this time, either one of the ejecting channel 362 of the head frame 320 or the ejecting gas inlet hole 342 of the tip 300, for example, as shown in Figs. 3 to 5 in this embodiment, The alignment tube 360 is inserted into the ejecting gas inlet hole 342 of the tip 300 when the tip 300 is coupled with the alignment tube 360, The inner diameter of the ejecting channel 362 and the inner diameter of the aligning pipe 360 are set equal to each other so that the center of the ejecting channel 362 is aligned with the center of the ejecting gas inlet hole 342. [ .

Although not shown, the alignment tube 360 is fixed to the injection gas inflow hole 342 of the tip 300. When the alignment tube 360 is coupled with the head frame 320, The injecting flow path 362 and the ejecting gas inflow hole 342 may be made to coincide with each other by being fitted to the ejecting flow path 362 of the ejecting gas inlet port 362. [

The packing 300 has a packing 363 fitted to the outer circumferential surface of the aligning tube 360 and a packing groove 364 for inserting the packing 363 into the inner tip 340 of the tip 300. So as to maintain the airtightness between the alignment tube 360 and the head frame 320 and the inner tip 340 provided with the alignment tube 360 simultaneously with the coupling of the head frame 320 and the tip 300 . Therefore, it is possible to prevent the mixture gas flowing into the mixed gas flow path 333 from being mixed with the cut oxygen flowing into the cut oxygen flow path 345 by the packing 363.

3 and 4, the internal structure of the head frame 320 will be described.

A fuel gas and preheated oxygen are injected into the head frame 320 to form an ejecting portion where the ejecting gas is generated. The ejecting portion is formed by a fuel gas chamber 327 formed at the end of the fuel gas flow path 324, and an ejecting core 350 provided in the fuel gas chamber 327.

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

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

On the other hand, as described above, a tapered surface 361 having a shape corresponding to the tapered surface 351 is formed in front of the tip end portion of the ejecting core 350 where the tapered surface 351 is formed.

Therefore, a gap is formed between the tapered surface 351 and the tapered surface 361, and this gap is connected to the fuel gas chamber 327.

The preheating oxygen passage 352 formed at the center of the ejecting core 350 is connected to the preheating oxygen passage 325 formed in the head frame 320 at the rear end of the ejecting core 350. Therefore, the preheated oxygen introduced through the preheating oxygen passage 325 flows into the rear end of the ejecting core 350 and is injected into the preheated oxygen injection hole 353 through the preheating oxygen passage 352. The preheated oxygen injected into the preheating oxygen injection hole 353 flows into the ejecting flow path 362.

In this process, the spacing between the tapered surface 351 and the tapered surface 361 of the ejecting core 350 is set to a low pressure by the flow of the preheated oxygen injected at a high speed, so that the fuel gas flow path 324 The fuel gas flowing into the fuel gas chamber 327 flows between the two tapered surfaces 351 and 361 and flows into the ejecting flow path 362 together with the preheated oxygen.

As described above, the preheating oxygen and the fuel gas introduced into the ejecting channel 362 are injected into the ejecting channel 362 and the ejecting gas inlet hole 342 connected thereto. Thereafter, the gas is injected into the mixed gas injection port (347 in Fig. 6) via the mixed gas flow path 333.

1) of the manual gas cutter according to the embodiment of the present invention has a structure in which the ejecting portion is disposed in the head frame 320 as described above, even if backflushing occurs during use, (362), so that it is possible to obtain an effect that the possibility of an accident such as an explosion is extremely low.

In addition, since the fuel gas in the fuel gas chamber 327 is sucked into the ejecting channel 362 and injected by the high-speed injection of the preheating oxygen having a relatively higher pressure than the fuel gas, a method that depends on the supply pressure of the fuel gas The fuel gas can be supplied stably and the constant thermal power can be maintained.

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

10 is an exploded cross-sectional view, and Fig. 11 is an exploded perspective view of a tip constituting the head, in which the tip 300 of the above-described embodiment is provided with the fuel gas Is used exclusively in the case of LPG, and the tip 400 of the present embodiment is used exclusively when the fuel gas is acetylene. Therefore, only the configuration of the tip is different, and the remaining components are the same, so that the tip can be used in accordance with the fuel gas.

Hereinafter, the configuration and operation of the acetylene tip 400 will be described. The structure of the head frame 320 is given the same reference numerals as those of the above-described embodiment, and the detailed configuration and operation will be omitted.

The tip 400 of another embodiment shown in Figures 9-11 comprises an outer tip 430 and an inner tip 440. The inner tip 440 is disposed in the space formed in the outer tip 430 so that the interior of the tip 400 has a double tube shape in which the cutoff oxygen flow path 445 and the mixed gas flow path 433 are formed.

11, a flange portion 431 having an enlarged diameter is formed at the rear end of the outer tip 430, and a flange portion 431 having an enlarged diameter is formed at a rear end of the inner tip 440, A flange portion 441 having an expanded diameter is formed at the end portion.

At this time, the flange portion 431 of the outer tip 430 is formed to have a larger diameter than the flange portion 441 of the inner tip 440, and has an assembly hole 434 into which the flange portion 441 is fitted A portion of the flange portion 431 is inserted into the alignment hole 313 of the fastening member 310 and the remaining portion is inserted into the seating groove 321 of the head frame 320. [

9, when the tip 400 is fixed to the head frame 320 by the fastening member 310, a part of the flange portion 431 of the outer tip 430 is inserted into the seating groove 321, And the flange portion 441 of the inner tip 440 is pressed and fixed by the fastening member 310 while being inserted into the assembly hole 434 formed in the flange portion 431 of the outer tip 430. [

It is preferable that the flange portion 431 of the outer tip 430 and the flange portion 441 of the inner tip 440 are fixed by welding or fixed by press fitting, The gas flow can be smoothly performed by improving the assemblability and uniformly maintaining the gas passages in the circumferential direction in a concentric manner.

The flange 441 of the inner tip 440 is formed with an injecting gas inlet hole 442 through which the mixed gas flow path 433 is connected and is cut into a shape extending from the rear end of the inner tip 440 to the tip end. An oxygen flow path 445 is formed and a connection pipe 450 is fixed to the distal end of the cutoff oxygen flow path 445. An end of the connection pipe 450 forms a cutoff oxygen injection port 446.

A plurality of radially arranged slits 444 are formed in the outer peripheral surface on the distal end side of the inner tip 440 so that mixed oxygen flows between the outer tip 430 and the inner tip 440, The distal end of the outer tip 430 is longer than the distal end of the inner tip 440 to form a through hole 432. The connection tube 450 is fitted and fixed to the through hole 432, And a rear end of the mixed gas injection port 435 communicates with the mixed gas flow path 433 through the slit 444. The mixed gas injection holes 435 are formed in the circumferential direction.

The cut oxygen is injected into the cutoff oxygen injection port 446 through the cutoff oxygen flow path 445 and the connection pipe 450 and the mixed gas inflow path 433 Is injected into the mixed gas injection port 435 through the slit 444. This will be described with reference to FIG.

FIG. 12 is a side view showing the tip of the tip in FIG. 9, and referring to FIG. 12, the cutter 449 is formed by the cutoff oxygen injection port 446 and the mixed gas injection port 435.

As described above, the cutoff oxygen injection port 446 is disposed in the center of the inner tip 440, and the mixed gas ejection ports 435 are disposed in the circumferential direction around the cutoff oxygen injection port 446.

Here, the mixed gas injected into the mixed gas injection port 435 is ignited to sufficiently heat the material to be processed (not shown). When the cut oxygen is injected through the cutoff oxygen injection port 446, the material to be processed (not shown) And the cutting of the material to be processed (not shown) can be performed.

13 is a side view showing a rear end portion of the tip 400 in FIG. 9. Referring to FIG. 13, a rear end portion of the cutoff oxygen flow path 445 is disposed at the center rear portion of the flange portion 441 of the inner tip 440, A connection channel 448 formed in the outer radial direction of the flange portion 441 from the cutoff oxygen channel 445 is provided and the connection channel 448 is connected to the cutoff oxygen flow path 326 and the cut-off oxygen flow path 445 of the inner tip 440 are communicated with each other. In addition, an ejecting gas inflow hole (442 in FIG. 10) and a packing groove 464 are disposed at the edge of the cutoff oxygen flow path 445.

That is, as described above, in order to inject the cutting oxygen into the cutoff oxygen injection port 446 and inject the mixed gas into the mixed gas injection port 435, cutting oxygen must be supplied to the cutoff oxygen flow path 445, 433). ≪ / RTI >

At this time, the connection passage 448 is connected to the connection passage 448 through the cutoff oxygen passage 445 of the tip 400 through the connection passage 448 rather than when the high heat is directly transferred to the cutoff oxygen passage 326 of the head frame 320. [ Thereby preventing the head frame 320 from overheating.

When the LPG is used as the fuel gas, the tip 400 is mounted on the head frame 320 and used as the fuel 300. In this case, When acetylene is used as the gas, the acetylene tip 400 may be attached to the head frame 320 and used.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to be illustrative of the present invention and not to be construed as limiting the scope of the present invention as defined by the appended claims. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

1: Manual gas cutter 2: Valve bundle
3: nozzle bundle 32: fuel gas pipe
33: preheated oxygen tube 34: cut oxygen tube
35: Head 300, 400: Tip
310: fastening member 320: head frame
324: fuel gas flow path 325: preheated oxygen flow path
326: Cutoff oxygen flow path 327: Fuel gas chamber
330, 430: outer tip 331, 431:
333, 433: Mixed gas flow path 340, 430: Inner tip
341: flange portion 342, 442: injecting gas inflow hole
344, 444: slit 345, 445:
346,446: Cutting oxygen nozzle 347,435: Mixing gas nozzle
348,448: Connection channel 360: Alignment tube
362: Injecting flow path 363: Packing
363,464: packing groove 450: connector

Claims (1)

The cut-off oxygen flow path provided in the head frame and the jetting channel, the cut-off oxygen flow path provided in the tip, and the injecting gas inflow hole are communicated with each other to be coupled by a fastening member, 1. A manual gas cutter having a head coupled to be in tight contact with a clamping force,
A cut-off oxygen flow path is disposed in the center of the tip, and a connection flow path formed radially outward from the cut-off oxygen flow path is formed in the rear end surface of the tip, And the gas is supplied to the gas passage.

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