KR200216450Y1 - A welding torch - Google Patents

Abstract

The present invention relates to a welding torch, in the prior art, there was a problem that the risk of explosion always exists because a backfire of a welding spark or a backflow of a spark that causes an explosion during a welding operation is always present. When the flame is ignited by injecting a mixing chamber in which a combustible gas and a retardant gas are mixed to form a welding gas, an injector which causes the welding gas mixed in the mixing chamber to be mixed with the outside air and ejected, and a welding gas mixed with the outside air in the injector It includes a fireball for generating a welding spark, and a backfire prevention means for preventing backfire and backflow generated during the welding operation inside the mixing chamber.

Description

Welding torch {A welding torch}

The present invention relates to a welding torch, and more particularly, to a welding torch that can stably block backfire generated during a welding process.

In general, welding is a method of locally melt bonding two or several metals, and various types of welding methods are used.

Among many different welding methods, gas welding is a combustible gas such as acetylene, hydrogen, propane, methane gas and oxygen or air with various properties such as high flame temperature, fast burning rate, large calorific value and microchemical reaction with molten metal. It is a method of melt-bonding a metal using the heat generated in the combustion process of the mixed gas which mixed the retardant gases, such as these.

Such gas welding usually uses a welding torch shown in FIG. 1.

The welding torch shown in FIG. 1 includes a mixing chamber 1 in which flammable gases such as acetylene and oxygen are mixed with each other to form a welding gas, and the welding gas mixed in the mixing chamber is blown out by mixing with outside air. There is an injector 6, which consists of a crater 7 for generating a welding spark when the spark is ignited from the outside by spraying the welding gas mixed with the outside air.

In the mixing chamber 1, first and second hose connecting ports 3 and 4 are respectively connected to a non-shown combustible gas cylinder and a rubber hose of a retardant gas cylinder, respectively. ) And a control nut 5 for adjusting the flow rate of the retardant gas is formed so that the combustible gas and the retardant gas are mixed therein.

Thus, the mixing chamber 1 which mixes flammable gas and retardant gas has a structure as shown in FIG.

1 and 2, the mixing chamber consists of a first annular housing 10 and a second annular housing 11 inserted inside the first annular housing.

Therefore, between the inner circumference of the first annular housing 10 and the outer circumference of the second annular housing 11, a combustible gas passage 12 (hereinafter, referred to as a first gas) through which a combustible gas supplied through the first hose connector 3 flows. And a retardant gas passage 13 (hereinafter referred to as a second gas passage) through which the retardant gas supplied through the second hose connecting opening 4 flows inside the second annular housing 11. 1 is formed to be isolated from the gas passage.

In addition, inside the second gas passage 13 inside the second annular housing, there is a needle valve 14 that adjusts the flow rate of the combustible gas while moving by the adjustment nut 5 outside the mixing chamber.

When welding is performed through a conventional welding torch having such a configuration, the cock is opened to allow the combustible gas to be ejected from the crater 7 through the injector 6 through the first gas passage 12.

Then, after igniting using the ignition lighter, by adjusting the adjustment nut 5 to adjust the flow rate of the retardant gas by the needle valve 14 to adjust the welding spark to weld.

In addition, the conventional welding torch is combined with oxygen or air when the outside air flowing through the oxygen or the fireball, which is a retardant gas supplied into the housing of the mixing chamber, flows back through the first gas passage and flows into the flammable gas cylinder. If there is a problem that backfire and explosion occurs by the characteristics of the flammable gas having an explosive property.

Therefore, conventionally, a flashback arrestor such as a check valve is attached to the flammable gas cylinder to prevent backflow during welding.

However, the conventional welding torch is equipped with a flashback arrestor to prevent explosion due to backflow and flashback, but the safety is insufficient for the risk that can occur when backflow and flashback occurs, and frequent explosion accidents have occurred.

Accordingly, the present invention has an object to provide a welding torch that effectively prevents backflow and backfire, thereby improving the safety of the welding operation.

Therefore, the welding torch according to the present invention, in order to achieve the above object, a mixing chamber in which a combustible gas and a retardant gas are mixed to form a welding gas, and an injector for allowing the welding gas mixed in the mixing chamber to be mixed with the outside air and ejected; It is characterized in that it comprises a fireball for generating a welding spark when the spark is ignited by injecting a welding gas mixed with the outside air from the injector, and a backfire prevention means for preventing backfire and backflow generated during the welding operation inside the mixing chamber.

1 is a view for explaining a conventional welding torch.

2 is a cross-sectional view for explaining a gas mixing chamber in a conventional welding torch.

Figure 3 is a cross-sectional view for explaining the gas mixing chamber in the welding torch according to the present invention.

※ Explanation of code about main part of drawing ※

1,20: gas mixing chamber 6: injector

7: crater 10,11,21,22: annular housing

12,13,23,24: Gas passage 26: Stair part

30: flashback prevention ring

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

The welding torch according to the present invention has a mixing chamber 20 in which a flammable gas such as acetylene and oxygen used for welding and oxygen are mixed with each other to form a welding gas. There is an injector (6), it is composed of a crater (7) for generating a welding spark when the spark is ignited from the outside by spraying the welding gas mixed with the outside air, the back flow and backfire generated during the welding operation inside the mixing chamber (20) Flashback prevention means for preventing the is provided.

Here, since the injector 6 and the crater 7 are the same as the conventional welding torch, a description thereof will be referred to a conventional welding torch, and a detailed description thereof will be omitted. Hereinafter, the mixing chamber 20 which is the main part of the present invention will be omitted. ) And flashback prevention measures in detail.

1 and 3, the mixing chamber 20 is coupled to the first and second annular housings 21 and 22 such that an inner circumference of the first annular housing 21 and an outer circumference of the second annular housing 22 are provided. A first gas passage 23 through which flammable gas flows is formed, a delayed gas flows inside the second annular housing 22, and a needle valve 14 operated by an adjustment nut 5 outside the mixing chamber is provided. The second gas passage 24 is provided so that the flow rate of the retardant gas is adjusted.

And, the backfire prevention means is installed in the first gas passage 23 to prevent backfire.

The flashback prevention means installed in the first gas passage 23 has a step portion 26 formed at a position at which the inner diameter is changed at the inner circumference of the first annular housing 21 so that the inner circumference and the first circumference of the first annular housing 21 are formed. 2 annular housing (22) forming a space between the outer periphery, the flashback prevention ring (30) for opening and closing the first gas passage while sliding in a certain distance from side to side by the gas pressure flowing through the first gas passage Is done.

Here, the gap between the outer diameter and the inner diameter of the flashback prevention ring 30 (that is, the thickness of the ring) is formed to be engaged with the first gas passage 23.

The welding torch according to the present invention having such a configuration enables welding by keeping the first gas passage 23 continuously open during the welding operation.

In other words, when the combustible gas supply process is described, when the cock 2 of the mixing chamber is opened to supply the combustible gas, the combustible gas enters the first gas passage 23 through the first hose connection port 3 in the combustible gas cylinder. Supplied.

The supplied flammable gas flows through the first gas passage 23 to slide the flashback prevention ring 30 toward the injector 6 by the gas supply pressure to closely contact the step portion 26.

Accordingly, the first gas passage 23 continuously maintains an open state to enable continuous supply of flammable gas, and the combustible gas supplied from the first gas passage 23 is discharged from the second gas passage 24. Welding is performed by mixing with the delayed gas supplied.

When backfire occurs during the welding process through such a process, the backfire is blocked by the backfire prevention means according to the present invention.

That is, when the outside air or the retardant gas flows back into the first gas passage 23 in the injector 6 direction, the backfire prevention ring 30 caught by the step portion 26 is introduced by the inflow pressure of the gas flowing back. It engages with the first gas passage 23 while slidingly moving in the direction opposite to the combustible gas supply direction, thereby quickly blocking the inflow of the gas flowing backward to prevent backfire.

As described above, the welding torch according to the present invention blocks backfire in the mixing chamber to prevent explosion of the gas cylinder due to backflow and backfire, and to relieve anxiety felt by the welding worker during welding. It will improve the safety of welding operation.

Claims (2)

Welding torch, A mixing chamber in which combustible gas and retardant gas are mixed to form a welding gas; An injector for causing the welding gas mixed in the mixing chamber to be mixed with the outside air and ejected; A crater for injecting a welding gas mixed with outside air from the injector to generate a welding spark when the spark is ignited; And a backfire prevention means for preventing backfire and backflow generated during the welding operation in the mixing chamber. The method according to claim 1, The flashback prevention means, A step portion is formed at a predetermined position in the inner annular housing of the mixing chamber to form a space in the combustible gas passage between the outer annular housing of the mixing chamber installed inside the first annular housing; And a backfire prevention ring inserted and inserted into the space to open and close the combustible gas passage while slidingly driving left and right by the gas pressure flowing through the combustible gas passage.