KR200280213Y1 - Gas torch with built-in prevention device of backfire - Google Patents

Abstract

The present invention relates to a gas welder with a built-in backlash prevention device, and more particularly, a backfire prevention device capable of double-blocking gas and flame backfire by incorporating a backfire prevention device inside a gas welder with a backflow prevention device. Relates to a built-in gas welder.

The present invention is a gas welder composed of a torch tip, a tip body and a tip body hinge integrally formed to achieve the above object,

A connection nut engaged with one end of the tip body hinge and having a thread formed along an inner circumference thereof;

A screw thread is formed on the outer circumference at one end to be coupled and fixed to the thread of the connection nut, and a coupling groove having a thread is formed along the inner circumference at an inner side of the other end, and a gas passage pipe penetrates into the longitudinal direction. First binder;

A flashback housing provided with a screw thread at an outer circumference of one end thereof to be coupled to a screw thread formed in the coupling groove of the first coupling body;

A joint pipe inserted into the other end of the flashback housing;

A second coupling member having a coupling groove at an inner side thereof so that the other end of the fitting pipe is inserted into and coupled to the inner end thereof, and having a screw thread formed at an outer periphery of the other end thereof, and having a gas passage pipe penetrating into the longitudinal direction;

A coupling groove having a thread formed along an inner circumference at one end thereof is provided at an inner side thereof, and a screw thread is provided at the other end of the outer circumference thereof so that it can be coupled to a screw thread formed at the outer circumference of the second coupling body. A backflow prevention housing having a narrow nozzle-shaped passage;

A check valve embedded in the backflow prevention housing, having a plurality of mixed gas passage tubes perforated at one end of the outer periphery, and provided with packing at the other end of the periphery;

A connection nut having a thread formed along an inner circumference thereof so as to be fixedly coupled with a thread of the backflow prevention housing;

A gas injection pipe having one end engaged with the connection nut, a gas injection hole at the other end thereof, and a plurality of single layers formed at the outer periphery thereof;

It is fitted to the outer periphery of the first assembly, the handle portion formed to be spaced apart slightly to the outside of the flashback housing and the fitting, the backflow prevention housing; has a configuration comprising a.

Description

Gas torch with built-in prevention device of backfire}

The present invention relates to a gas welder with a built-in backlash prevention device, and more particularly, a backfire prevention device capable of double-blocking gas and flame backfire by incorporating a backfire prevention device inside a gas welder with a backflow prevention device. Relates to a built-in gas welder.

Until now, a gas welder using a low pressure acetylene gas has been used a lot, but in recent years, a gas welder using a high pressure LPG has been popularized.

However, the gas welder is the most important factor to maintain the stability of the gas flame, when the gas pressure is unstable or inadequate, the gas salt becomes unstable due to contamination of the torch tip, clogging or overheating of the torch tip, accordingly, Difficulties in cutting work or the flame was backfired.

On the other hand, the flashback phenomenon is that when the flow rate of the gas flowing into the torch housing of the welder, which mixes and regulates oxygen and fuel gas, is very low, only a "beep" sound is heard, but no flame is generated at the torch tip. This is because the flow rate of the gas flowing out of the tip is less than the speed of the flame delivered in the gas, that is, the combustion speed, so that the flame flows back into the tip.

If a flashback phenomenon occurs during the cutting operation, not only can the burner get burned, but in severe cases, it may cause a gas explosion and cause a fatal problem.To prevent such a flashback phenomenon, various kinds of flashback prevention devices have been As developed, Korean Utility Model (No. 225486) "Torch with Gas Flashback Arrestor" is connected to the oxygen line 103 and the gas line 105 at the rear, like a general gas welder, and a welder tip ( 107 is located, the high-pressure oxygen valve 109, the preheated oxygen valve 111 and the gas control valve 113 and the like is installed in each line connection portion of the housing (102).

Here, the flashback arrestor 121 is installed inside the gas control valve 113 connected to the gas line 105, and the high pressure LPG is transferred from the LPG barrel to the gas line 105 of the welder 101 through the gas hose. When supplied, the valve spool 123 in the flashback arrestor 121 is ejected from the rubber coating wall 125 by high pressure and normally discharges gas to the welder tip through the welder housing 102.

However, when the amount of supply gas decreases and backfire occurs in the gas, the spool 123 is brought into close contact with the rubber coating wall 125 by the backflow gas, thereby preventing the gas from flowing back through the gas line 105. At this time, while the spool 129 blocking the gas outlet 127 is lowered by the pressure of the reversed gas, the reversed gas is discharged into the atmosphere, whereby the pressure in the housing 102 is lowered and the spool 129 is released. It rises again and closes the outlet 127. At the same time, the gas introduced from the gas line 103 pushes the spool 123 into the housing 102 where the pressure is lowered and is supplied to the welder tip.

As described above, although the backfire phenomenon can be prevented even through the conventional gas welder 101, when the backfire is discharged directly through the outlet, not only the cutting worker can be burned but also the explosion of the gas in severe cases. A fatal problem could have occurred that could cause.

In addition, the gas welder is integrally formed with a gas mixing chamber, and the flashback arrestor itself has a complicated structure such as a spool or a spring, thereby increasing the weight of the torch, and as a result, the worker may easily feel fatigue when working. In addition, the work efficiency is lowered, and the work time is also increased, which requires security.

The present invention is designed to solve the above problems, the flame is backfired is extinguished in the backfire prevention housing in which the mesh is interpolated, the gas backflow through the backfire prevention housing is double safety to block the backflow prevention housing formed with a check valve The technical problem is to provide a gas welder with a built-in flashback prevention device that can be completely structured to prevent safety accidents.

Another technical problem of the present invention is to reduce the volume and weight of the gas welder itself, thereby increasing the work efficiency, reducing the work time, and reducing the maintenance effort, and greatly improving the convenience of use. Another technical problem is to provide a gas welder with a built-in flashback prevention device.

1 is a gas welder equipped with a conventional flashback prevention device

2 is a front view of a gas welder built-in flashback prevention device according to the present invention

3 is a cross-sectional view of a gas welder built-in flashback prevention device according to the present invention

4 is a cross-sectional view taken along the line A-A of the gas welder with a flashback prevention device according to the present invention

Figure 5 is a cross-sectional view showing a backflow prevention state of the gas welder with a backfire prevention device according to the present invention

6 is a cross-sectional view showing a gas injection state of the gas welder equipped with a flashback prevention device according to the present invention

Explanation of symbols on the main parts of the drawings

1: mixed gas injection hole 3: mixed gas injection pipe

5: Backflow prevention housing 7: Connection nut

9: check valve 11: packing

13: joint pipe 15: flashback housing

17: Network 19: connecting nut

21: tip body hinge 23: tip body

25: tip head 27: tip

29: handle portion 31: the first assembly

33: mixed gas passage pipe 35: second binder

In the gas welder with a built-in flash prevention device of the present invention for achieving the above technical problem in the gas welder consisting of a torch tip, a tip body and a tip body hinge integrally formed,

A connection nut engaged with one end of the tip body hinge and having a thread formed along an inner circumference thereof;

A screw thread is formed on the outer circumference at one end to be coupled and fixed to the thread of the connection nut, and a coupling groove having a thread is formed along the inner circumference at an inner side of the other end, and a gas passage pipe penetrates into the longitudinal direction. First binder;

A flashback housing provided with a screw thread at an outer circumference of one end thereof to be coupled to a screw thread formed in the coupling groove of the first coupling body;

A joint pipe inserted into the other end of the flashback housing;

A second coupling member having a coupling groove at an inner side thereof so that the other end of the fitting pipe is inserted into and coupled to the inner end thereof, and having a screw thread formed at an outer periphery of the other end thereof, and having a gas passage pipe penetrating into the longitudinal direction;

A coupling groove having a thread formed along an inner circumference at one end thereof is provided at an inner side thereof, and a screw thread is provided at the other end of the outer circumference thereof so that it can be coupled to a screw thread formed at the outer circumference of the second coupling body. A backflow prevention housing having a narrow nozzle-shaped passage;

A check valve embedded in the backflow prevention housing, having a plurality of mixed gas passage tubes perforated at one end of the outer periphery, and provided with packing at the other end of the periphery;

A connection nut having a thread formed along an inner circumference thereof so as to be fixedly coupled with a thread of the backflow prevention housing;

A gas injection pipe having one end engaged with the connection nut, a gas injection hole at the other end thereof, and a plurality of single layers formed at the outer periphery thereof;

It is fitted to the outer periphery of the first assembly, the handle portion formed to be spaced apart slightly to the outside of the flashback housing and the fitting, the backflow prevention housing; has a configuration comprising a.

On the other hand, the inside of the flashback housing is preferably formed by interpolating a metallic mesh of the metal material, and the inside of the backflow prevention housing is a plurality of mixed gas passage pipes perforated at the outer periphery, the other end One side outer periphery is preferably formed with a check valve provided with a packing.

Therefore, according to the gas welder with a built-in flashback arrestor having the above configuration, when the cutting operation is normally performed, the mixed gas injected through the mixed gas inlet opens the check valve formed inside the backflow prevention housing at high speed. , The mixed gas passing through the backflow preventer is normally discharged from the torch tip through the fitting pipe, the flashback housing and the tip body.

However, at this time, when the gas pressure decreases due to a decrease in the mixing ratio of oxygen and gas, and the outflow velocity of the gas flowing out of the tip decreases, backflow and backfire occur, and the flame causes the tip, tip head, and tip body due to the backflow and backfire. Through the flame prevention housing is reached, the mesh formed inside the flame arrest housing to extinguish the flame to be backfired.

Here, the flame is extinguished by the flashback arrestor, but the backflow gas passes through the mesh and passes through the joint pipe to the backflow prevention housing. At this time, the gas flowing back at high speed pushes the check valve inside the backflow prevention housing to a high pressure. As a result, the check valve has a configuration capable of completely blocking the gas flowing back while closing the expansion / reduction nozzle formed inside the backflow prevention housing.

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

2 to 3 is a front view and a cross-sectional view of a gas welder with a built-in flashback prevention device according to the present invention, a torch tip 27, a tip body 23 and a tip body hinge integrally formed with a tip head 25 In the gas welder composed of 21,

A connection nut 19 engaged with one end of the tip body connector 21 and having a thread formed along an inner circumference thereof;

A screw thread is formed on the outer circumference at one end to be coupled to the thread of the connection nut 19, and a coupling groove having a thread is formed along the inner circumference at an inner side of the other end, and penetrates into the longitudinal direction and passes through the gas passage. A first assembly 31 provided with a tube;

A flashback preventing housing (15) provided with a screw thread at an outer periphery of one end thereof so as to be coupled to a screw thread formed in the coupling groove of the first coupling member (31);

A joint pipe 13 inserted and inserted into the other end of the flashback housing 15;

A second coupling member (35) having a coupling groove formed at an inner side thereof so that the other end of the fitting pipe (13) is inserted into and coupled to the inner end thereof, and having a thread formed at an outer periphery of the other end thereof, and having a gas passage pipe penetrating into the longitudinal direction;

A coupling groove having a thread formed along an inner circumference at one end thereof is provided at an inner side thereof so as to be coupled to a screw thread formed at the outer circumference of the second coupling member 35, and a thread is provided at the other end of the outer circumference thereof. A backflow prevention housing 5 having an enlarged and reduced nozzle-shaped passage therein;

A check valve embedded in the backflow prevention housing 5 and having a plurality of mixed gas passage tubes 33 perforated at one end of the outer periphery and having a packing 11 at the outer periphery of the other end;

A connection nut (7) having a thread formed along an inner circumference thereof to be fixedly coupled with the thread of the backflow preventing housing (5);

A gas injection pipe (3) having one end engaged with the connection nut (7), the other end having a mixed gas injection hole (1), and a plurality of single layers formed at the outer periphery;

It is fitted to the outer circumference of the first assembly 31, the handle portion 29 formed to be somewhat spaced apart to the outside of the flashback housing (15) and the fitting pipe (13), the backflow prevention housing (5); Has a configuration.

4 is a cross-sectional view taken along line AA of a gas welder incorporating a backfire prevention device according to the present invention, and a mesh-shaped mesh 17 made of metal is formed inside the backfire prevention housing 15, and the backfire prevention housing 15 The handle portion 29 is formed to be somewhat spaced apart to the outside of the.

Figure 5 is a cross-sectional view showing a backflow prevention state of the gas welder with a built-in flashback prevention device according to the present invention, the gas backflow due to the instability of the gas through the tip body and the flashback housing and the fitting pipe to the backflow prevention housing (5) This leads to.

At this time, the gas flowing back at a high speed pushes the check valve 9 provided in the backflow prevention housing 5, and the check valve 9 is flowed back by closing the gas inlet formed inside the backflow prevention housing. It has a configuration to block the gas.

Here, the packing 11 formed by the outer circumference of the check valve 9 serves to completely block the gas entering into the fine space formed between the check valve 9 and the gas inlet.

Figure 6 is a cross-sectional view showing a gas injection state of the gas welder equipped with a flashback prevention apparatus according to the present invention, when the pressure of the mixed gas outflow is stronger than the pressure of the backflow gas, the mixed gas is closed the gas inlet While pushing the check valve 9, the gas inlet is opened.

Therefore, the mixed gas passes through a plurality of mixed gas passage pipes 33 formed as one end of the check valve 9 and flows out through the tip through the fitting pipe 13 and the flashback housing and the tip body.

According to the gas welder with a built-in flashback prevention device according to the present invention, the flame to be backfired is extinguished in the flashback prevention housing in which the mesh is interpolated, and the gas flowed back through the flashback prevention housing is blocked in the backflow prevention housing formed with a check valve. Double safety structure prevents safety accidents. In addition, as the gas mixing chamber is separately formed outside the gas welder, the volume of the gas welder itself becomes smaller and lighter, and thus, work efficiency can be increased, and It can produce excellent effects that can save time.

On the other hand, since the coupling structure has a coupling structure by screwing or connecting nut, if a part is broken or breaks down, only that part can be replaced. It can be reused after cleaning to prevent contamination, blockage or overheating inside the gas welder, and to reduce the labor-related maintenance, and greatly improve the convenience of use.

Claims (2)

In the gas welder consisting of a torch tip, a tip body integrally formed with the tip head and a tip body hinge, A connection nut engaged with one end of the tip body hinge and having a thread formed along an inner circumference thereof; A screw thread is formed on the outer circumference at one end to be coupled and fixed to the thread of the connection nut, and a coupling groove having a thread is formed along the inner circumference at an inner side of the other end, and a gas passage pipe penetrates into the longitudinal direction. First binder; A flashback housing provided with a screw thread at an outer circumference of one end thereof to be coupled to a screw thread formed in the coupling groove of the first coupling body; A joint pipe inserted into the other end of the flashback housing; A second coupling member having a coupling groove at an inner side thereof so that the other end of the fitting pipe is inserted into and coupled to the inner end thereof, and having a screw thread formed at an outer periphery of the other end thereof, and having a gas passage pipe penetrating into the longitudinal direction; A coupling groove having a thread formed along an inner circumference at one end thereof is provided at an inner side thereof, and a screw thread is provided at the other end of the outer circumference thereof so that it can be coupled to a screw thread formed at the outer circumference of the second coupling body. A backflow prevention housing having a narrow nozzle-shaped passage; A check valve embedded in the backflow prevention housing, having a plurality of mixed gas passage tubes perforated at one end of the outer periphery, and provided with packing at the other end of the periphery; A connection nut having a thread formed along an inner circumference thereof so as to be fixedly coupled with a thread of the backflow prevention housing; A gas injection pipe having one end engaged with the connection nut, a gas injection hole at the other end thereof, and a plurality of single layers formed at the outer periphery thereof; A gas welder with a built-in backlash preventing device, comprising: a handle portion fitted to the outer circumference of the first assembly and formed to be spaced apart slightly to the outside of the backfire prevention housing and the fitting pipe and the backflow prevention housing. The gas welder with a built-in flashback preventing device according to claim 1, wherein a metal mesh is inserted into the backside of the flashback housing.