KR20040052128A - Gas cutting torch having ignition apparatus - Google Patents

Abstract

PURPOSE: A gas welder having an ignition device is provided to prevent gas from being flowing back and to ignite the gas welder without using a match or a lighter by installing the ignition device in the gas welder. CONSTITUTION: A gas welder(100) includes a gas injection part(120), a gas conduit part(140), a gas adjusting part(150), a tip part(160), and a handle part(170). Gas is introduced into the gas injection part(120) from a temporary gas storing tank. The gas conduit part(140) guides gas in a predetermined direction. The gas adjusting part(150) adjusts an amount of gas. Gas is exhausted to an exterior through the tip part(160). A backfire preventing device is provided in order to prevent gas from flowing back into the gas welder(100). A user grips the gas welder(100) by using the handle part(170).

Description

Gas cutting torch having ignition apparatus

The present invention relates to a gas cutter equipped with an ignition device, and more particularly, is provided with an ignition device that is provided with an ignition device that can ignite a gas by simply pressing a button without a separate ignition device when the gas is ignited. It relates to a gas cutter.

In general, a gas cutting machine refers to a mechanism for cutting a metal by the heat of reaction between the metal and oxygen gas. The metal is mainly cut using oxygen acetylene, but in addition to acetylene, hydrogen, natural gas, coal gas, propane (Propane) Metals may be cut using a gas or the like as a combustion gas.

Such a gas cutter is usually configured to eject combustion gas together with oxygen, and the size of the cutter to be used varies depending on the thickness or size of the metal to be cut.

Specifically, such a gas cutting machine includes a pipe for sending oxygen to the main body, a plurality of pipes for sending combustion gas, and a valve device for adjusting the flow rate of the gas, and the injection hole has such a gas. It is configured to be ejected together.

Therefore, when a metal to be cut, i.e., steel, is provided, a conventional gas cutting machine mixes combustion gas and oxygen such as LPG and acetylene, which are emitted from the nozzle of the gas cutting machine, to heat the steel to about 1450 ° C. When the heated steel reaches the melting point, the steel is cut by blowing high pressure oxygen. More specifically, when 5 to 8 kg of high pressure oxygen is ejected to the steel having reached the melting point, the steel is combusted and converted to iron oxide having a lower melting point than the steel, thereby transforming into a molten liquid, which is a completely molten liquid. It has the principle of being cut to be blown off.

However, such a conventional gas cutter must be ignited first to cut metal, but since a conventional gas cutter is not provided with an ignition device, there is a problem in that a separate lighter or match is used to ignite the gas. do.

That is, in general, the cutting operation is performed outdoors with a thick fire protection glove, and when a separate lighter or match is used to ignite the gas, the problem of having to take off the thick fire protection glove and then ignite the gas. Is generated.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a gas cutting machine having an ignition device capable of igniting gas without using an external ignition device such as a lighter or a match.

In addition, another object of the present invention is a safety device, such as a specially invented flashback prevention device, such as a terminal for coupling the ignition gas tube and the coated piezoelectric wire and a device in which the ignition gas tube and the coated piezoelectric wire are embedded in the high-pressure pipe. It is to provide a gas cutting machine having a doubled and simple appearance.

1 is a perspective view showing an embodiment of a gas cutter equipped with an ignition device according to the present invention.

FIG. 2 is a longitudinal sectional view of the gas cutter shown in FIG. 1; FIG.

FIG. 3A is a schematic perspective view of a portion of the gas injection unit and the gas conduit unit of FIG. 1; FIG.

3B is an enlarged cross-sectional view of portion A of FIG. 2.

Figure 3c is a schematic exploded perspective view showing an enlarged automatic ignition apparatus.

4 is an enlarged cross-sectional view of a portion B of FIG. 2.

5 is an enlarged cross-sectional view of portion C of FIG. 2;

FIG. 6 is an enlarged cross-sectional view of part D of FIG. 2;

<Description of the symbols for the main parts of the drawings>

100: gas cutter 120: gas injection unit

140: gas conduit unit 150: gas control unit

160: tip portion 170: handle portion

180: automatic ignition device

As a configuration of the present invention for achieving the above object,

A gas injection unit into which oxygen and combustion gas are injected, a gas conduit unit through which oxygen and combustion gas injected into the gas injection unit pass, a gas control unit controlling a flow rate of oxygen and combustion gas passing through the gas conduit unit; In the gas cutting machine for cutting the metal by ejecting the gas burned to the outside, including a tip portion and the handle portion covering one side of the gas conduit portion is burned while the oxygen passing through the gas conduit and combustion gas to the outside, the gas The conduit portion is equipped with an ignition port that serves to ignite the combustion gas ejected to the tip portion; The handle portion includes a button protruding from a predetermined portion, a switching lever interlocked with the button, an electricity generating unit interlocked with the switching lever to emit electrical sparks to the ignition port, and interlocked with the switching lever to ignite the ignition port. It has a structural feature including an ignition gas supply unit for ejecting the gas.

The ignition port, and the ignition nozzle facing the tip; An ignition gas supply hole perforated to allow the ignition gas to be supplied to the ignition nozzle; and preferably mounted at a portion of the gas conduit adjacent to the tip portion.

The ignition gas supply unit includes: a gas temporary storage tank of a cylindrical shape in which an ignition gas outlet is formed; A driven rod interposed in the gas temporary storage tank and interlocked with the switching lever to flow back and forth to discharge the ignition gas into the ignition gas outlet; An spring interposed in the gas temporary storage tank and elastically supporting the driven rod to return to its original position; It is preferable to include; a support cap which supports the spring and communicates with the gas injection part to allow the ignition gas to flow into the gas temporary storage tank.

The electricity generating unit includes a trigger button pressed by the switching lever; It is preferable that it consists of a coated piezoelectric wire that serves as an electric transport so that the electricity generated by the triggering of the trigger button can be launched into the ignition nozzle,

A first flashback prevention device and a second flashback prevention device are respectively installed in the gas conduit part between the tip part and the ignition port and the gas injection part into which the oxygen is injected, thereby preventing backfire of the ignited combustion gas and oxygen. Is preferred,

The first flashback prevention device includes: a cylinder interposed on the gas conduit portion and having a flow path having a first equalization portion and a first change portion; A cylinder cap inserted and fixed to a first equal portion of the cylinder and having a first guide protrusion extending into the cylinder; A piston which is inserted into the first guide protrusion and flows a predetermined distance in the cylinder; It is preferably configured as; a sealing ball to selectively seal the first change portion while being moved by the piston.

On the other hand, the second flashback prevention device, the oxygen injection port and the combustion gas injection port formed with the flow path of the second equalizing portion and the second change portion, respectively; A fixed cap which is interposed in the second equal parts of the oxygen inlet and the combustion gas inlet, and has a second guide protrusion extending in the direction of the second changing part; It is preferably configured to include; a flow member which is inserted into the second guide projections and flows a predetermined distance inside the oxygen injection port and the combustion gas injection port to seal the second change unit.

The first flashback prevention device and the second flashback prevention device include: a first communication hole and a first inflow hole penetrating a plurality of outer peripheral surfaces of the piston and the flow member, respectively; First and second inflow holes penetrating a plurality of part surfaces corresponding to the first and second inflow holes, respectively, of the first and second guide protrusions; By further including the, when the combustion gas or oxygen backfire occurs, the first communication hole and the second communication hole, the first inlet hole and the second inlet hole is shifted mutually preferably to prevent the combustion gas or oxygen backfire prevention. .

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, these examples are only for illustrative purposes, and the technical idea of the present invention is not limited to these examples.

1 to 4 will be described in detail an embodiment of a gas cutter 100 provided with an ignition device according to the present invention.

As shown in the figure, the gas cutting machine 100 having an ignition device according to an embodiment of the present invention is a gas injection unit 120 is injected into the gas from the external gas temporary storage tank 185 and the like as a whole, and The gas conduit 140 to allow the injected gas to pass in a predetermined direction, the gas control unit 150 to adjust the flow rate of the gas passed in this way, and the gas passing through the gas conduit 140 is burned out. The tip portion 160 to be ejected, and the handle portion formed to catch the flashback device and the gas cutter 100 to prevent the gas burned by the tip portion 160 from being backfired as it enters the gas cutter 100. It consists of 170.

In more detail, the gas cutter 100 cuts the metal using combustion gas for blowing high pressure oxygen and a heating flame, and at least two gas supply pipes should be provided. The gas conduit section 140 of the gas cutter 100 of the present invention is a high-pressure pipe 141 mainly through which oxygen of a high pressure passes. It is mainly composed of a low pressure pipe 142 through which low pressure combustion gas passes.

In addition, the gas injection unit 120 is formed at one end of the gas conduit unit 140 and is composed of an oxygen injection hole 121 through which oxygen is injected and a combustion gas injection hole 122 through which combustion gas is injected. In addition, the tip 160 is formed at the other end of the gas conduit 140, and is formed such that oxygen and combustion gas passing through the low pressure pipe 142 and the high pressure pipe 141 are ejected to the outside together.

In addition, the first gas conduit portion 122a and the second gas conduit portion 122b, which are two pipe conduits communicating with the combustion gas injection portion 122, respectively, and a support cap at the end of the first gas conduit portion 122a ( It has a configuration of the ignition gas supply unit 180 hermetically coupled by 192.

In the above-described configuration, by supplying only a small amount of ignition gas to the ignition opening 144 to be described later when the ignition gas is supplied by the operation of the ignition gas supply unit 184, the auto ignition can be performed, and the second gas conduit 122b ) Is configured to supply the combustion gas to the cutting nozzle 172 irrespective of the shielding of the ignition gas supply unit 184.

At this time, a gas lever 123 capable of controlling a flow rate of the injected combustion gas is mounted at a portion adjacent to the combustion gas inlet 122 into which the combustion gas is injected, and a gas conduit portion positioned at a portion adjacent to the tip 160. 140, the ignition port 144 is mounted toward the cutting nozzle 172 through which the gas of the tip unit 160 is ejected.

Hereinafter, the ignition port will be described in detail, the ignition port 144 is installed at an inclined angle of about 5 ° toward the cutting nozzle 172 of the tip portion 160, and the high pressure pipe 141 and the low pressure pipe 142 are installed. Installed across. Accordingly, oxygen and combustion gas passing through the high pressure pipe 141 and the low pressure pipe 142 pass through the ignition port 144. The ignition port 144 of the portion intersecting with the high pressure pipe 141 is located at the center thereof. The T-shaped through hole is formed so that high-pressure oxygen and combustion gas pass through the center through the T-shaped through hole of the ignition hole 144, and the ignition hole 144 of the portion intersected with the low pressure pipe 142 at the edge portion thereof. A through hole is formed so that the low pressure combustion gas passes through the ignition port 144 through the through hole at the edge portion.

That is, the T-hole is formed in the ignition opening 144 of the portion intersecting with the high-pressure pipe 141, and oxygen and combustion gas introduced into the high-pressure pipe 141 pass through the T-hole. When the 172 is not open, the oxygen and the combustion gas pass through the ignition port 144, and when the cutting nozzle 172 is opened, the oxygen and the combustion gas are almost the same due to the pressure difference. It passes in the cutting nozzle 172 direction.

Here, when the cutting nozzle 172 is not opened, the ignition nozzle 146 is formed inside the ignition hole 144 so that combustion gas passing in the ignition hole 144 direction may be ejected, such an ignition nozzle 146. Ignition gas supply port 148 is formed on one side of the ignition gas supply unit 184 to be supplied from the ignition gas supply unit 184 to be described later, and the other side of the ignition nozzle 146, the electricity generating unit 183 to be described later When electricity is generated from the coated piezoelectric wire 183b to which the electricity is transmitted is connected.

In addition, the portion of the gas conduit 140 close to the gas injection unit 120, the handle portion 170 is installed so that the user can comfortably hold the gas cutter 100, the adjacent side of the handle portion 170 is injected Gas control unit 150 that can adjust the flow rate of oxygen and combustion gas is installed.

Here, the handle portion 170 is formed of a metal or resin of the appropriate length and the appropriate thickness so as to hold the user comfortably, is installed, one handle portion 172 and the other handle portion 174 to facilitate disassembly and assembly. Divided into and tightly coupled by a fastening means such as a bolt nut, wrapped around the oxygen pipe 121a in communication with the high pressure pipe 141, and the second gas conduit portion 122b in communication with the low pressure pipe 142. Is installed. In addition, the gas control unit 150 is composed of a high pressure control valve 154 for adjusting the high pressure oxygen flow rate, and a low pressure control valve 155 for controlling the low pressure combustion gas flow rate.

On the other hand, the inner and outer one side of the handle portion 170 is provided with an automatic ignition device 180 for igniting the combustion gas of the gas cutter (100).

That is, the automatic ignition device 180 includes a button 181 formed to be pressed by a user, a switching lever 182 rotated by a predetermined angle as the button 181 is pressed, and the switching lever 182 has a predetermined angle. The ignition gas that interlocks with the switching lever 182 to splatter electricity as it is rotated and the switching lever 182 is rotated at an angle, interlocks with the switching lever 182 to eject a certain amount of ignition gas. Consisting of the supply unit 184, the button 181 is installed to be exposed to the outer side of the handle portion 170, the electricity generating unit 183 and the ignition gas supply unit 184 of the handle portion 170 It is installed inside, the switching lever 182 is installed to rotate at a predetermined angle from the handle portion 170, one end is installed to be exposed to the outside of the handle portion 170 with the button 181 and the other end of the electricity generating unit ( 183 and the gas supply unit 184 are installed in close proximity.

In detail, the electricity generating unit 183 has the same configuration as that of the ignition unit of the electronic ignition writer that is widely used, and the trigger button 183a is pressed by the movement of the switching lever 182. By loading, it is the structure which can generate electricity.

In detail, the button 181 is formed of a rubber material and a spring 189 or the like that can be pressed when the user presses and releases it back to its original state. It is fitted in (not shown).

In addition, the switching lever 182 has a flake shape refracted twice by about 90 ° in different directions. The switching lever 182 is rotatably installed at a central portion to be rotated at a predetermined angle, but is installed at a lower portion of the button 181. As described above, one end of the switching lever 182 is fitted inside the button, and the other end is installed to be close to or in contact with the electricity generating unit 183 and the ignition gas supply unit 184 and rotated at a predetermined angle. Therefore, when the user presses one end of the switching lever 182, the switching lever 182 is rotated by a predetermined angle and the other end of the switching lever 182 is interlocked a predetermined length toward the gas injection unit 120, the user switching When the lever 182 stops pressing and releases, the switching lever 182 is restored to its original position by the spring 189 to be described later.

On the other hand, the electricity generating unit 183 is installed inside the handle portion 170 as described above to generate electricity in conjunction with the switching lever 182, the electricity to ignite the combustion gas.

That is, the electricity generating unit 183 is installed inside the handle portion 172 of the handle portion 170 is installed near the other end of the switching lever 182 so that the switching lever 182 is gas injection portion 120 The ignition nozzle 146 of the ignition port 144 by the piezoelectric wire 183b embedded in the high-pressure pipe 141 is generated in conjunction with the switching lever 182 in accordance with a predetermined length movement in the () direction. It is connected to, and the electricity transmitted in this way is to ignite the ignition gas supplied to the inside of the ignition port 144 through the ignition gas supply port 148. The primary ignited flame reaches the cutting nozzle 172 of the tip 160 by the combustion gas or the like supplied to the ignition nozzle 146 of the ignition port 144, and the flame thus reached through the cutting nozzle 172. Secondary ignition of the combustion gas supplied.

In addition, the ignition gas supply unit 184 is installed and operated similarly to the electricity generating unit 183, the other end of the switching lever 182 while being installed inside the other handle portion 174 of the handle portion 170 It is installed in close proximity to the switching lever 182 is rotated by a predetermined angle, and acts to interlock the switching lever 182 with the electricity generating unit 183 to eject a certain amount of ignition gas to the ignition port 144, The gas temporary storage tank 185, driven rod 186, the spring and the support cap 192 and the like. At this time, the ignition gas supply unit 184 is installed so that one end thereof is close to the other end of the switching lever 182 or alternately, the other end is on the high-pressure pipe 141 located inside the handle portion 170 It is preferred to be installed.

Here, the gas temporary storage tank 185 is a portion in which a predetermined amount of ignition gas used for ignition of the combustion gas is temporarily stored, and is formed in a hollow cylinder shape, and the inside of the gas temporary storage tank 185. A piston-shaped driven rod 186 and a spring 189 are interposed therebetween, and a support cap 192 is mounted at the end of the gas temporary storage tank 185.

That is, three holes (Hole) are formed in the cylindrical gas temporary storage tank 185, the piston coupling hole is formed in the center in the direction in which the switching lever 182 is installed, the ignition gas outlet (185a) at the edge ) Is formed, and in the opposite direction, a support cap coupler to which the hollow support cap 192 is fitted is formed. Accordingly, the driven rod 186 is inserted into the piston coupler to flow back and forth by the switching lever 182 or the spring 189, the spring 189 is to move the driven rod 186 in the gas temporary storage tank 185. It is elastically supported, the support cap 192 serves to allow the gas to flow into the gas temporary storage tank 185 while supporting the spring (189).

In addition, the ignition gas outlet 185a is coupled to the ignition gas tube 191, the ignition gas tube 191 is molded tube 200, such as the piezoelectric wire 183b of the electricity generating unit 183 is coated. The piezoelectric wire 183b is connected to the ignition nozzle 146 of the ignition port 144 and is inserted into the pipe through the inside of the pipe of the high pressure pipe 141. By communicating with the ignition gas supply port 148, it has a configuration that can achieve automatic ignition.

In more detail, the operation principle of the auto ignition is to press the switching lever 182, the driven rod 186 is first variable, the ignition gas is discharged to the ignition port 144, the second switching As the lever 182 is further displaced rearward, the trigger button 183a of the electricity generating unit 183 is triggered, so that an electrical spark is generated in the ignition nozzle 146. The first ignition gas discharged is first ignited. To initiate flame discharge toward the cutting nozzle 172, and has an operating principle of automatic ignition by subjecting the combustion gas discharged through the cutting nozzle 172 to secondary ignition.

In addition, the gas terminal 145 is inserted into the end of the high-pressure pipe 141 toward the ignition gas supply unit 184, and the molding tube 200 in which the ignition gas tube 191 and the piezoelectric wire 183b are embedded. It serves to grip. Therefore, as described above, the ignition gas tube 191 and the piezoelectric wire 183b are connected to a corresponding portion of the ignition port 144 via the high pressure pipe 141 by one molding tube 200.

Here, the driven rod 186 is inserted into the gas temporary storage tank 185 of the role of the cylinder (Piston) and flows back and forth selectively, the combustion gas, that is, the ignition gas along the ignition gas tube 191 ignition port Bar 144 may be supplied to the bar, it is preferable that the O-ring (187, etc.) is installed to block the combustion gas when the combustion gas is shut off.

On the other hand, the gas cutter 100 of the present invention is provided with a backfire prevention device for preventing the gas burned by the tip portion 160 from being backfired while flowing into the gas cutter 100, and the backfire prevention device includes a tip portion 160 and The first flashback prevention device 110 interposed on the low pressure pipe 142 between the ignition holes 144, and the second flashback prevention device 130 is installed in the vicinity of the oxygen injection port 121.

First, referring to FIG. 5, the first flashback prevention device 110 will be described in detail. The first flashback prevention device 110 is a hollow cylinder 116 interposed on the low pressure pipe 142 as shown in the drawing. ), A cylinder cap 112 fitted in the direction of the tip portion 160 of the cylinder 116, and a piston 117 interposed inside the cylinder 116 and the piston 117 and the cylinder 116 are located. It is implemented with a sealing ball 119.

In more detail, a flow path is formed in the cylinder 116 so that gas can flow therein, and the flow path is not opened to a uniform size in the cylinder 116 as a whole, but the ignition hole 144 in the direction of the tip portion 160. Direction is uniformly opened in a certain sized flow path for a predetermined distance, and from the portion close to the ignition opening 144, it changes rapidly from this uniform sized flow path to a somewhat smaller flow rate. Therefore, hereinafter, a flow path having a uniform size inside the cylinder 116 will be referred to as a 'first equal portion 113', and a portion rapidly changed to a flow path having a smaller size will be referred to as a 'first change part 115'. Shall be.

At this time, the hollow cylinder cap 112 is fitted into the first equalizing portion 113 of the cylinder 116, and the piston is between the cylinder cap 112 and the first changing portion 115 of the cylinder 116. 117 is inserted into the cylinder cap 112, and a first guide protrusion 111 may be formed to guide the piston 117 to a portion extending into the cylinder 116. In addition, the piston 117 is formed in a circular rod shape, the end opposite to the first change portion 115 of the cylinder 116 is closed, the end opposite to the cylinder cap 112 is the first guide protrusion 111 It is opened by a hole of a predetermined size so that it can be fitted into. Accordingly, the piston 117 is reciprocated for a predetermined distance within the cylinder 116 while being fitted to the first guide protrusion 111 of the cylinder cap 112.

Meanwhile, a plurality of first communication holes 114 and second communication holes penetrating the first guide protrusion 111 of the cylinder cap 112 and the piston 117 fitted to the first guide protrusion 111, respectively ( 118 is formed, the first communication hole 114 and the second communication hole 118 is closed by selectively communicating with each other or the mutual displacement by the flow of the piston 117.

That is, the piston 117 is to be reciprocated in the cylinder 116, when the combustion gas flows from the gas inlet 120 toward the cutting nozzle 172, the first communication hole 114 and the second communication hole ( 118 is in communication with each other, and combustion gas is smoothly ejected toward the cutting nozzle 172. However, when the flame is diverged back from the cutting nozzle 172 to the gas inlet 120, a predetermined pressure is applied to the blocked portion of the piston 117. The first communication hole 114 and the second communication hole 118 are variably positioned in the direction of the gas inlet 120, and the gas supplied to the low pressure pipe 142 or the low pressure pipe 142 is reversed. Combustion gas to be shut off primarily.

At this time, the sealing ball 119 described above is interposed between the closed end of the piston 117 and the first change part 115 of the cylinder 116 opposite thereto, the sealing ball 119 is Likewise, when the piston 117 flows in the direction of the first changing part 115, the piston 117 is caught between the closed end of the piston 117 and the first changing part 115 of the cylinder 116, thereby lowering the low pressure pipe ( Secondly, the combustion gas supplied to the 142 or the gas flowing back through the low pressure pipe 142 is blocked more reliably.

On the other hand, the two second flashback prevention device 130 which is installed in the adjacent portions on the oxygen injection port 121 and the combustion gas injection hole 122, respectively, as shown in FIG. 6, the oxygen injection hole 121 and the combustion gas injection hole ( A fixed cap 124 interposed between and fixed to the adjacent portions of the 122, and a flow member 125 interposed between the end of the oxygen inlet 121 and the combustion gas inlet 122 and the fixed cap 124 for reciprocating flow. Is implemented as

More specifically, the oxygen inlet 121 and the combustion gas inlet 122, and a portion adjacent to these flow passages are formed in a predetermined size so that gas can flow therein, respectively, the passage is continuously uniform It is not formed in size but is formed in a uniform size. A portion of the oxygen inlet 121 and the combustion gas inlet 122 that are close to the end portion of the diameter changes rapidly. Therefore, hereinafter, a portion formed in a uniform size in a portion of the flow path in each of the portions adjacent to the oxygen injection hole 121 and the combustion gas injection hole 122 will be referred to as a 'second equal portion 132', and the oxygen injection hole 121 will be described. And a portion which approaches the end of each of the combustion gas injection holes 122 and changes rapidly to a smaller diameter, will be referred to as a 'second change part 134'.

Here, a hollow fixing cap 124 is inserted into and fixed to the second equalizing portion 132 of the flow path as described above, and a flow member 125 is disposed between the fixing cap 124 and the second changing portion 134. To be reciprocated.

At this time, the second cap projection 131 of a predetermined length is formed to be fixed to the fixed cap 124 so that the flow member 125 is inserted and flows in the direction of the second change part 134. Then, the flow member 125 is formed in a circular rod shape, the end opposite to the second change portion 134 is closed, the end opposite to the fixing cap 124 can be fitted to the second guide protrusion 131. It is opened to a predetermined size (Hall) so that. Accordingly, the flow member 125 is reciprocated for a predetermined distance in each of the flow paths adjacent to the oxygen inlet 121 and the combustion gas inlet 122 while being fitted to the second guide protrusion 131 of the fixed cap 124.

Here, the closed end of the flow member 125 is formed in a hemispherical shape so as to seal the second change portion 134, and the flow path of the second change portion 134 can be more accurately sealed around the hemispherical end portion. O-ring 129 is fitted so that it can be.

On the other hand, a plurality of first inlet holes 126 and second inlet holes are respectively formed at the ends of the second guide protrusion 131 of the fixing cap 124 and the flow member 125 fitted to the second guide protrusion 131. 127 is formed, and the first inflow hole 126 and the second inflow hole 127 are selectively communicated with each other by the flow of the flow member 125.

That is, the flow member 125 is to be reciprocated in the flow path close to the oxygen inlet 121 and the combustion gas inlet 122, respectively, the first inlet when the flow member 125 flows in the fixed cap 124 direction The hole 126 and the second inflow hole 127 communicate with each other to smoothly supply combustion gas and oxygen.

However, when a backfire phenomenon such as a combustion gas or a flame occurs, the flow member 125 flows in the direction of the second change unit 134 in a flow path close to the oxygen injection hole 121 and the combustion gas injection hole 122, respectively. While the first inlet hole 126 and the second inlet hole 127 are shifted from each other, the first inlet hole 126 and the second inlet hole 127 are provided with primary blocking of oxygen or combustion gas or flame supplied from the high pressure pipe 141 or the low pressure pipe 142.

When the flow member 125 flows in the direction of the second change unit 134, the hemispherical end portion of the flow member 125 is inserted into the second change unit 134 on the flow path to secondary the flame and the like. Carry out a block.

In addition, when the flow member 125 flows in the direction of the second change part 134, the O-ring 129 fitted around the hemispherical end portion seals the flow path of the second change part 134 more accurately. In addition, it is configured to block backfire flames.

Hereinafter, the operation and effects of the gas cutter 100 provided with the present invention ignition device configured as described above will be described in detail.

First, when oxygen and combustion gas are respectively supplied to the oxygen injection port 121 and the combustion gas injection port 122 of the gas cutter 100 according to the present invention, the user is provided with the gas lever 123 of the gas injection unit 120. The low pressure control valve 155 of the gas control unit 150 is opened to a predetermined portion to allow combustion gas to flow into the gas cutter 100.

At this time, the combustion gas is introduced into the gas inlet 120 is discharged and supplied by a predetermined amount to the cutting nozzle 172 of the tip portion 160 and the gas temporary storage tank 185 of the automatic ignition device 180, respectively.

Thereafter, the user presses the button 181 exposed to the handle part to ignite the combustion gas in the ignition port 144 and simultaneously ignite the combustion gas in the cutting nozzle 172.

That is, when the user presses the button 181, the switching lever 182 installed on the lower side of the button 181 is rotated at an angle, and the triggering button 183a of the electricity generating unit 183 and the ignition gas supply unit 184 The driven rod 186 is pushed a certain distance. Accordingly, the driven rod 186 of the ignition gas supply unit 184 is pushed back from the gas temporary storage tank 185, the combustion gas stored in the gas temporary storage tank 185 by the push of the driven rod 186. The gas is transferred into the ignition port 144 through the ignition gas outlet 185a, the ignition gas tube 191, the ignition gas supply port 148, and the like of the gas temporary storage tank 185. At the same time, when the switching lever 182 is further rotated, the trigger button 183a of the electricity generating unit 183 is pressed to generate predetermined electricity, and the generated electricity is coated piezoelectric wire 183b. By splashing the electrical flame on the ignition nozzle 146 of the ignition port 144 through the), the ignition gas that has already reached the ignition port is first ignited, and flames are emitted to the combustion gas flowing out to the cutting nozzle 172. It has the operation principle of performing auto ignition by performing secondary ignition.

Therefore, the inside of the ignition port 144 is first ignited by the electricity of the coated piezoelectric wire 183b and the ignition gas supplied to the ignition gas supply port 148, and the flame by the primary ignition is the ignition port 144. The cutting nozzle 172 of the tip portion 160 is reached by the high pressure oxygen and combustion gas supplied to the ignition nozzle 146 of FIG. 2, and the flame thus reached is equal to the combustion gas supplied through the cutting nozzle 172. It is to be graded.

Then, the user cuts the metal by supplying high pressure oxygen to the cutting nozzle 172 by opening the high pressure control valve 154 according to the progress of the process.

The above-mentioned flashback prevention device has the same technical idea as "Korean Utility Model Registration Application No. 2002-0004156" filed February 8, 2002 by the inventor of the present invention, and prevents the flashback prevention of the gas cutting machine. As it is configured in an optimized part, it is possible to realize the prevention of backfire such as combustion gas, flame and oxygen, and to prevent the safety accidents caused by the flame backfire, and to prevent the device from being damaged.

As described above, since the ignition device 180 is provided with the ignition device according to the present invention, since the ignition device 180 is provided in the gas cutter itself, it is possible to ignite the gas by pressing the button 181. This will solve all the problems of igniting the gas with a lighter or a match without taking off the fire protection gloves.

In addition, since the gas cutting device provided with the ignition device according to the present invention is provided with a backfire prevention device in two portions, all the problems caused by backfired gas are prevented.

As described above, since the gas cutting machine equipped with the ignition device according to the present invention is provided with the ignition device in the gas cutting machine itself, it is possible to ignite the gas by pressing a button once. It is effective in solving all the problems of igniting the gas with a match or the like.

In addition, since the gas cutting device provided with the ignition device according to the present invention has a backfire prevention device installed in two parts, any problems caused by backfired gas are all prevented.

Claims (8)

A gas injection unit into which oxygen and combustion gas are injected, a gas conduit unit through which oxygen and combustion gas injected into the gas injection unit pass, a gas control unit controlling a flow rate of oxygen and combustion gas passing through the gas conduit unit; In the gas cutting machine for cutting the metal by ejecting the gas burned to the outside, including a tip portion and a handle portion for covering one side of the gas conduit as the oxygen and combustion gas passing through the gas conduit is ejected to the outside, The gas conduit portion is equipped with an ignition port that serves to ignite the combustion gas ejected to the tip portion; The handle portion has a button protruding from a predetermined portion, A switching lever interlocked with the button, An electricity generating unit interlocking with the switching lever and emitting an electrical spark to the ignition port; And an ignition device including an ignition gas supply unit interlocked with the switching lever to eject the ignition gas to the ignition port. The method of claim 1, wherein the ignition port, An ignition nozzle facing the tip; And an ignition gas supply hole perforated so that the ignition gas can be supplied to the ignition nozzle, wherein the gas cutting unit is mounted at a portion of the gas conduit adjacent to the tip. According to claim 1, wherein the ignition gas supply unit, A gas temporary storage tank of a cylindrical shape having an ignition gas outlet; A driven rod interposed in the gas temporary storage tank and interlocked with the switching lever to flow back and forth to discharge the ignition gas into the ignition gas outlet; A spring interposed in the gas temporary storage tank and elastically supporting the driven rod to return to its original position; And a support cap which supports the spring and communicates with the gas injection part to allow the ignition gas to flow into the gas temporary storage tank. According to claim 1, wherein the electricity generating unit, A trigger button pressed by the switching lever; And a coated piezoelectric wire, which serves as an electric transporter, so that electricity generated by the triggering of the triggering button can be released to the ignition nozzle. The combustion according to claim 1, wherein a first flashback prevention device and a second flashback prevention device are respectively installed in the gas conduit portion between the tip portion and the ignition port and the gas injection portion in which the oxygen is injected. A gas cutting machine, characterized in that to prevent backfire of gas and oxygen. The method of claim 5, wherein the first flashback arrestor, A cylinder interposed on the gas conduit part and having a flow path having a first equalization part and a first change part; A cylinder cap inserted and fixed to a first equal portion of the cylinder and having a first guide protrusion extending into the cylinder; A piston which is inserted into the first guide protrusion and flows a predetermined distance in the cylinder; Gas cutting machine characterized in that consisting of; sealing ball for selectively sealing the first change portion while being moved by the piston. The method of claim 5, wherein the second flashback prevention device, An oxygen injection hole and a combustion gas injection hole each having a flow path of the second equalizing portion and the second changing portion; A fixed cap which is interposed in the second equal parts of the oxygen inlet and the combustion gas inlet, and has a second guide protrusion extending in the direction of the second changing part; And a flow member fitted to the second guide protrusion to flow the predetermined distance inside the oxygen injection hole and the combustion gas injection hole to seal the second change part. The method according to any one of claims 5 to 7, The first flashback prevention device and the second flashback prevention device include: a first communication hole and a first inflow hole penetrating a plurality of outer peripheral surfaces of the piston and the flow member, respectively; First and second inflow holes penetrating a plurality of part surfaces corresponding to the first and second inflow holes, respectively, of the first and second guide protrusions; By further including, when the combustion gas or oxygen backfire occurs, the first communication hole and the second communication hole, the first inlet hole and the second inlet hole is shifted mutually to prevent backfire of the combustion gas or oxygen to perform Gas cutters.