JP2006007230A - Liquid fuel torch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid fuel torch that is applicable to fusion-cutting/welding purpose using an inexpensive liquid fuel excellent in handleability and that is, for this purpose, capable of forming a stable flame suitable for the fusion-cutting/welding requiring safety and accuracy. <P>SOLUTION: This liquid fuel torch is equipped with a venturi section in a supporting gas path, a liquid fuel guiding path that guides the liquid fuel to the narrowest part or downstream thereof in the venturi section and that is separate from the supporting gas path, and a mixed gas guiding path that guides to the nozzle the mixed gas of the liquid fuel and the supporting gas, wherein the mixed gas is formed by the liquid fuel being diffusively atomized into the supporting gas at the venturi section and is partly vaporized and partly atomized/diffused. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid fuel torch.

  Torch used for fusing applications generally uses gaseous fuel, such as acetylene or liquefied petroleum gas, which is gaseous at normal temperature and pressure as fuel, and supplies oxygen-containing air or oxygen gas as a combustion aid to the torch crater. A flame is formed at the tip.

  Here, acetylene has a heat of combustion of 301.5 kcal / mol, which is much higher than hydrogen and natural gas. Therefore, if acetylene is burned with oxygen, a high temperature of about 3000 ° C. can be obtained. When applied, it is possible to quickly melt a relatively thick metal plate.

  However, acetylene is an unstable substance and will explode if handled incorrectly. Furthermore, since acetylene is relatively expensive, the acetylene can be used outside the acetylene manufacturing plant, and is supplied in a cylinder in order to have portability.

  However, since acetylene explodes when compressed, it cannot be liquefied and filled like normal fuel gas. Therefore, acetylene is filled in a cylinder filled with diatomaceous earth and soaked with acetone so as to be dissolved in the acetone. For this reason, even a general cylinder that can be filled with only 7 kg of acetylene has a mass of 70 kg, which is extremely poor in transportability and handling. Furthermore, the actual on-site running costs, including the cost of purchasing and periodic inspections related to the cylinder, and the cost of collecting and refilling the empty cylinder are extremely high.

  Here, some studies have been made on torches that use a liquid fuel with a relatively low boiling point (220 ° C. or lower) as a fuel, such as gasoline, which is liquid at normal temperature and normal pressure with a boiling point of 30 ° C. or higher. It was.

  In the initial stage of the study, a study was made using a torch for gaseous fuel such as acetylene, which is known as a type 1 cutter or a type 3 cutter in JIS B 6801 (Non-Patent Document 1).

  However, in such a torch based on a gas fuel torch, liquid fuel that is still in a liquid state is supplied to the crater, so a long flame (as long as about 1 m in length) as if it were a flamethrower. It was not possible to form a flame with a stable and practical shape that could be applied to applications such as fusing and welding.

  Therefore, recently, as a torch using liquid fuel, a felt-like porous material is set in an auxiliary gas passage such as oxygen gas, and the liquid fuel is continuously supplied to this to disperse the liquid fuel in a mist form. A torch of the type that forms a gas mixture and burns at the tip of the crater is now supplied.

In such an improved torch, the formation of a long flame such as the above-mentioned flamethrower was prevented, but in the flame, like a fireball or handheld (toy) fireworks spark In addition, a non-uniform combustion part is formed and a beeping sound is generated, and in some cases, combustion continues even if it goes out of the flame. Especially immediately after ignition, these fireballs and sparks are long, with a length of nearly 20 cm, It was obvious that the flame itself was orange and incompletely burned. For this reason, it is not a flame that can be used for actual, particularly precise fusing / welding, etc., and a combustion flame mixed with a low-temperature flame is unstable and requires extremely high temperatures such as fusing / welding and carefulness. Due to problems such as disturbing the mind of the worker immediately before performing the work or giving anxiety, practical use was difficult.
JIS B 6801

  The present invention improves the above-mentioned conventional problems, that is, it can be used for fusing and welding applications by using an inexpensive liquid fuel. At that time, it is also safe and stable for fusing and welding applications. It is an object to provide a liquid fuel torch capable of forming a flame that can be used and a liquid fuel torch system having such a liquid fuel torch.

In order to solve the above problems, the liquid fuel torch of the present invention is as described in claim 1,
A liquid fuel guide path having a venturi section in the auxiliary combustion gas path and guiding the liquid fuel to the venturi section, which is different from the auxiliary combustion path, and the liquid fuel is atomized and dispersed in the auxiliary combustion gas in the venturi section. A liquid fuel torch having a mixed gas guide path that leads to a crater of a mixed gas of a liquid fuel partially vaporized and partially atomized and dispersed and an auxiliary combustion gas.

  According to the liquid fuel torch of the present invention, liquid fuel such as gasoline, kerosene and other petroleums, alcohols, etc., which are inexpensive and easy to handle, can be used for fusing and welding applications. Thus, a liquid fuel torch capable of forming a stable flame, which can be applied to fusing and welding applications that require precision, is possible.

  An example (mainly a hand torch used for fusing) A of a liquid fuel torch according to the present invention will be described with reference to the drawings. The present invention is not limited to a fusing torch, but can be used as a hand torch in various fields such as fusing, welding, heating, melting, etc. Can be applied, and such a case is also included in the present invention.

  FIG. 1 shows an overall view thereof. The reference numeral 1 indicates oxygen gas (or air. However, oxygen gas is usually used for fusing applications. The oxygen gas or air is used as auxiliary gas and fusing as described later. An auxiliary combustion gas introduction part for introducing a gas) and a reference numeral 2 denotes a liquid fuel introduction part.

  The auxiliary combustion gas introduction part 1 and the liquid fuel introduction part 2 are connected to the in-grip auxiliary combustion gas pipe 4 and the in-grip liquid fuel pipe 5 that pass through the inside of the grip part 3 for the operator to hold and hold. The in-grip auxiliary combustion gas pipe 4 and the in-grip liquid fuel pipe 5 are connected to the flow rate adjusting part A1 of the fusing hand torch A.

  FIG. 2 shows a partially enlarged sectional view in the vicinity of the flow rate adjusting unit A1. The auxiliary combustion gas pipe 4 in the grip 3 branches into two in the flow rate adjusting part A1, and one of the auxiliary combustion gas pipes 4 is connected to an auxiliary gas path 4b, which is an auxiliary gas path during combustion of the liquid fuel, via the auxiliary gas path connection part 4a. The other is connected to the fusing oxidant gas path 6 which is the fusing oxidant gas path via the fusing oxidant gas path connecting portion 6a.

  These auxiliary combustion gas path connection portion 4a and fusing oxidation gas path connection portion 6a have fusing oxidation gas flow rate adjustment valve 4a1 and auxiliary combustion gas flow rate adjustment valve 6a1 (main) so that the flow rates of auxiliary combustion gas and fusing oxidation gas can be adjusted. In the example, both needle valves are provided (in the drawings, reference numerals are attached to the operation portions of the respective valves).

  On the other hand, the liquid fuel pipe 5 in the grip is connected to the liquid fuel guiding path 5b via the liquid fuel guiding path connecting portion 5a.

  In FIG. 2, a shaft 5b2 of a liquid fuel flow rate adjusting valve 5b1 (the reference numeral is attached to the valve operating portion in the drawing), which will be described in detail later, penetrates the liquid fuel guiding path 5b.

  Next, FIG. 3A shows a cross section of the crater vicinity portion A2 including the crater holding portion 8 and the crater 9. A venturi portion 7, that is, a partial narrow portion is provided in the auxiliary combustion gas path 4b. The liquid fuel guiding path 5b guides the liquid fuel in the venturi portion 7 and downstream of the narrowest flange portion 7a or the narrowest flange portion 7a (in this example, the narrowest flange portion 7a).

  In this example, the auxiliary combustion gas path 4b cannot be made too thin because the shaft 5b2 of the liquid fuel flow rate adjusting valve 5b1 penetrates inside. Therefore, a thin-diameter portion 5b3 made of a small-diameter pipe is provided at the tip thereof, and the liquid fuel is guided to the narrowest flange portion 7a of the venturi portion 7 (an enlarged view of the vicinity of the venturi portion 7 is shown in FIG. 3B). reference).

  With such a configuration, the venturi unit 7 is formed by atomizing and dispersing the liquid fuel in the auxiliary combustion gas, a part of which is vaporized and a part of the atomized and dispersed liquid fuel and the auxiliary gas is formed. Is done.

  If the liquid fuel is to be guided in the venturi portion 7 upstream of the narrowest flange portion 7a, the auxiliary combustion gas may flow back into the liquid fuel pipe due to the pressure generated in the venturi portion. A mixed gas in which mist-like liquid fuel is dispersed cannot be obtained, and there is a risk of backfire on the fuel pipe side, which is very dangerous.

  The mixed gas obtained at the downstream side of the venturi section 7 is guided to the crater 9 by the mixed gas guiding path 8a. The nozzle shaft portion 9a of the crater 9 has a hook-shaped fitting portion 9a1, and this fitting portion 9a1 is fitted into the fitting portion 8b of the crater holding portion 8, and the crater 9 is connected to the crater holding portion 8 together with screw means. It is detachably fixed by the holder inner hole 8c.

  A narrow through hole 9a2 is provided in the bowl-shaped fitting portion 9a1, and the mixed gas guided from the mixed gas guiding path 8a passes through the thin through hole 9a2, and thus is dispersed in the mixed gas. The atomized liquid fuel is further refined.

  The outer shape of the crater 9 is substantially cylindrical, and is composed of a throttle-shaped portion 9b and a cylindrical-shaped portion 9c that narrow toward the tip. In this example, the throttle-shaped portion 9c is a part of a spherical surface or a spheroid. The curved surface is convex outward (in this example, a part of a spherical surface).

  Even when the crater 9 is likely to be heated (overheated), for example, during gouging work, particularly in the work of drilling a hole in the center of the iron plate, the crater 9 may be heated by the curved surface that protrudes outward on the crater side surface. Since the flow of air supplied from the side to the tip of the crater 9 is stably maintained (confirmed using incense smoke), the crater can be prevented from overheating and effectively prevent backfire. Can do.

  As shown in FIG. 3 (c), which is a partially enlarged sectional view, the crater first that supplies the mixed gas along the inner wall of the substantially cylindrical crater 9 toward the tip of the crater 9 is provided inside the crater 9. Connected to the supply passage 9d and the crater first supply passage 9d, the mixed gas supplied by the crater first supply passage 9d toward the tip of the crater 9 is reversed toward the crater 9 base (crater holding portion 8 side). The crater second supply path 9e that guides in the direction and the crater second supply path 9e is connected to the crater second supply path 9e, and the mixed gas guided toward the base of the crater 9 by the crater second supply path 9e is reversed again. There is a preheating gas supply path consisting of a crater final supply path 9f to be supplied to the tip, and the vicinity of the connection portion between the crater first supply path 9d and the crater second supply path 9e, which is a turning point of the mixed gas in the guiding direction ( (It may be around 200 ° C) even when using the torch. Alternatively, a felt 10 made of carbon fiber is disposed as a fiber lump made of heat-resistant fiber that does not deteriorate (in the present invention, in addition to such carbon fiber, quartz fiber having sufficient heat resistance, Inorganic fibers such as heat-resistant glass fibers and silicon carbide fibers, and metal (alloy) fibers can be used.

  Here, since the mixed gas is supplied along the inner wall of the substantially cylindrical crater 9 by the crater first supply path 9d, the crater 9 is actively heated as will be described later. As a result, the liquid fuel dispersed in mist in the mixed gas is heated and evaporated. The side surface of the crater 9 and the wall forming the first supply path are made of copper or a copper alloy (copper in this example) having excellent heat conductivity, so that the heat at the tip of the crater is effectively transferred. At the same time, heating of the tip of the crater can be effectively prevented.

  Further, the flow of the mixed gas is reversed by the crater first supply path 9d and the crater second supply path 9e, but at this time, of the liquid fuel existing in the form of mist in the remaining mixed gas Large particles are not accompanied by the return of the direction of the mixed gas flow due to their inertia, and go straight as they are, so that the mixed gas is induced between the first crater supply passage 9d and the second crater supply passage 9e. Absorbed by the felt 10 made of carbon fiber as a fiber lump made of heat-resistant fiber that does not melt or deteriorate even when the torch is used, which is provided in the vicinity of the connection portion that is the turning point of the direction. Here, the liquid fuel absorbed in the felt 10 made of carbon fiber is evaporated by the heat transferred from the tip of the crater 9, and the vaporized vapor is mixed again with the mixed gas, and then the crater second supply path. 9d flows toward the base of the crater 9 In this way, this liquid fuel torch has a folding guide path that is folded back near the crater, and a fuel trap / volatilization promoting section that captures the non-volatile liquid of fuel at the folding point and promotes volatilization of the captured liquid fuel. Have.

  The mixed gas after that is removed after the relatively large liquid fuel remaining by the reversal of the gas flow formed by the crater second supply path 9e and the crater final supply path 9f is removed. Is finally guided to the nozzle 9g of the crater 9 (in this example, integrated with the nozzle shaft portion 9a).

  The nozzle 9g of the crater 9 has a truncated cone shape, and has a nozzle groove 9g1 that constitutes a crater final supply path through which a mixed gas passes and guides the nozzle tip.

  Here, the mixed gas is directly guided to the nozzle tip (nozzle opening 9h) by the nozzle groove 9g1, but in this example, the crater final supply passage 9f is formed by a narrow narrow passage and an open passage wider than the narrow passage. Has been.

  That is, it is considered that the unvaporized fuel remaining in the mixed gas as fine droplets is finally vaporized by the heat of the nozzle while passing through the crater final supply path. At this time, as shown in FIG. When the nozzle portion 9g ′ side surface is completely blocked, leaving the nozzle groove 9g1 ′, and the crater final supply path is only the nozzle groove 9g1 ′, the fine particles of the liquid fuel are vaporized in the nozzle groove 9g1 ′, When expanded, it becomes a massive fuel gas with almost no oxygen, and reaches the nozzle opening 9h 'and burns, resulting in partial incomplete combustion, and a part of the flame having a different combustion temperature. At the same time, an abnormal noise called a bee is produced.

  However, in this example, the side surface of the nozzle 9g is sealed with the first portion (the rearmost portion) 9g2 and the rearmost portion (tip portion) 9g3 leaving the nozzle groove 9g1, but the side surface is not sealed at the intermediate portion 9g4. First, since the mixed gas once throttled in the narrow narrow passage portion by the nozzle groove 9g1 of the first portion (the rearmost portion) 9g2 is released in the gas reservoir portion 9i that is an open passage portion wider than the narrow passage portion, Since the lump is eliminated and the gas becomes more uniform and is supplied to the nozzle groove 9g1 of the last portion (tip portion) 9g3 reaching the nozzle opening 9h, the reduction due to partial incomplete combustion as described above is solved. The operator can concentrate on the work.

  Further, in this example, a nozzle opening 9h that blows out the mixed gas to the outside from the crater tip 9j is provided on the base side, and the crater tip is generated by the heat of the flame formed in the nozzle opening 9h during use. 9j is heated. For this reason, the temperature in the vicinity of the carbon fiber felt 10 filled in the vicinity of the connection portion that is the turning point of the mixed gas in the induction direction between the crater first supply path 9d and the crater second supply path 9e increases, The granular liquid fuel soaked in the felt 10 is volatilized effectively, and the heat of the crater tip 9j heated by the heat of the flame is transferred to the nozzle 9g to heat the nozzle 9g. The residual granular liquid fuel is completely eliminated.

  Although the nozzle shaft portion 9a and the nozzle 9g are integrated as described above, a fusing oxidation gas hole 9k connected to the fusing oxidation gas passage 6 is provided in the center of the nozzle shaft portion 9a and the nozzle 9g, and this torch is fusing. In the case of use, fusing oxidation gas (usually oxygen gas) passes through fusing oxidation gas hole 9k and is supplied to fusing gas opening 9l provided together with nozzle opening h.

  In the above, the liquid fuel torch A (melting torch) according to the present invention has been described. Here, similarly, the auxiliary combustion gas path 4b ′ has the venturi portion 7 ′ and the innermost portion of the venturi portion 7 ′. A liquid fuel guiding path 5b ′ different from the auxiliary combustion gas path 4b ′ for guiding the liquid fuel to the narrow part, and a part formed by atomizing and dispersing the liquid fuel in the auxiliary combustion gas in the venturi section 7 ′ As an example of a liquid fuel torch A ′ (melting torch) having a mixed gas guiding path 8a ′ for introducing a mixed gas of liquid fuel and auxiliary combustion gas partially vaporized and dispersed into the crater 9 FIG. 4 shows a partial cross section of the crater vicinity A2 ′ composed of the crater holding portion 8 ′ and the crater 9 ′.

  Also in this example, the auxiliary combustion gas path 4b ′ is provided with a venturi portion 7 ′, that is, a partially narrowed portion. Unlike the liquid fuel torch A, the auxiliary combustion gas path 4b ′ is not in the auxiliary combustion gas path 4b ′. A liquid fuel guiding path 5b ′ is provided outside, and the liquid fuel guiding path 5b ′ guides the liquid fuel to the narrowest flange portion 7a ′ in the venturi section 7 ′ by the auxiliary guiding path 5b4 ′. 4 is a needle valve shaft for adjusting the flow rate of the liquid fuel. Further, the external shape of the crater 9 'of this example A' is generally used, and is substantially cylindrical, and is constituted by a narrowed shape portion 9b 'and a cylindrical shape portion 9c' that become narrower toward the tip thereof. The constricted portion 9b 'has a truncated cone shape. (In this type of crater, the flow of the surrounding air tends to be disturbed, so it is relatively overheated during gouging work, in particular, when making a hole in the center of the iron plate. ).

  Further, the liquid fuel torch A ″ (melting torch) according to the present invention will be described with reference to a partial model diagram (FIG. 5). The liquid fuel torch A ″ is similar to the liquid fuel torches A and A ′ and the auxiliary combustion gas path. A liquid fuel guiding path 5b ″ separate from the auxiliary combustion gas path 4b ″, which has a venturi section 7 ″ in 4b ″ and guides the liquid fuel to the narrowest flange portion 4b3 ″ in the venturi section 7 ″; In the venturi section 7 ″, the liquid fuel is atomized and dispersed in the auxiliary combustion gas, partly vaporized and partly the atomized and dispersed liquid fuel and auxiliary gas are guided to the crater 9 ″. A liquid fuel torch having a mixed gas guiding path 8a ″, but the venturi section 7 ″ is in the vicinity of a flow rate adjusting section (not shown), and as a result, the mixed gas is longer than the liquid fuel torch A and A ′. When using the taxiway 8a " A heat transfer body 8d "made of copper is provided to transfer the heat of the crater holder 8" heated by the heat from the mouth, and the mixed gas is heated to vaporize the liquid fuel in the mixed gas. To be promoted.

  Here, a liquid fuel torch system of the present invention is a liquid fuel torch system having the above liquid fuel torch, comprising a liquid fuel supply path for supplying liquid fuel to the liquid fuel torch, and a liquid fuel tank, The sampling port for supplying the liquid fuel to the liquid fuel supply path of the liquid fuel tank is provided near the bottom of the liquid fuel tank and spaced from the bottom, and is liquidated by an air pump connected to the liquid fuel tank. The inside of the fuel tank can be pressurized, and the liquid fuel tank has a sealable injection hole for injecting fuel into the inside, and a cylindrical shape connected to the injection hole and penetrating into the tank This is a liquid fuel torch system that includes an over-injection prevention cylinder portion that prevents injection of a predetermined amount or more of liquid fuel.

  Here, a model cross-sectional view of an example B of such a liquid fuel tank is shown in FIG. In FIG. 6, a sampling port 11b for supplying liquid fuel to the liquid fuel supply path 11a of the liquid fuel tank B is provided near the inner bottom portion 11c of the liquid fuel tank B and spaced from the bottom portion 11c. The liquid fuel tank B can be pressurized by an air pump 11d connected to the fuel tank B, and the liquid fuel tank B can inject the liquid fuel 12 into the sealable injection hole. 11e and a cylindrical over-injection prevention cylinder portion 11f connected to the injection hole 11e and penetrating into the tank B.

  FIG. 6 shows a state in which a predetermined amount of liquid fuel 12 has been injected, and even if more liquid fuel 12 is to be injected, it does not enter tank B. For this reason, a sufficient space is secured above the liquid level in the tank, and the inside of the tank B by injecting air into the tank by the air pump 11d connected to a position higher than the liquid level of the fuel 12 inside the tank B. By pressurization, it can be confirmed by a predetermined upper limit pressure (pressure gauge 11g. If the tank internal pressure becomes abnormally high for some reason, the safety valve 11j is activated to release the internal pressure. The pressure inside the tank B is maintained within a predetermined pressure range even when the 11 liquid level of the fuel inside the tank B is lowered due to the use of the fuel. ing.

  Reference numerals 11h and 11i in FIG. 7 denote liquid amount confirmation windows, respectively, and the inside of the tank B can be seen through the liquid amount confirmation windows. Further, the cylindrical over-injection preventing cylindrical portion 11f can be removed, and the water accumulated in the bottom portion can be discharged when water is mixed as a result of use inside the tank. Even when a small amount of water accumulates in the tank B bottom portion 11c, the sampling port 11b is provided away from the liquid fuel tank B bottom portion 11c, so that the water is prevented from being supplied to the torch. ing.

  By providing a pressure adjusting unit (configured by a diaphragm type pressure regulator) for controlling the supply pressure of the liquid fuel to the liquid fuel torch within a certain range between the liquid fuel tank B and the liquid fuel torch. Thus, more stable fuel supply is possible, and a stable flame can be stably obtained for a longer time.

  Moreover, when a fusing test of the iron plate was performed using the liquid fuel torch system having the hand torch A and the liquid fuel tank B, a stable flame could be obtained immediately after ignition, and a conventional acetylene gas was used. Processing was possible at the same processing speed as the hand torch.

  The liquid fuel torch of the present invention uses a liquid fuel such as gasoline that is extremely cheap compared to an acetylene torch, and obtains a stable flame that can be precisely welded and blown without partial incomplete combustion. be able to.

It is a figure which shows the whole liquid fuel torch A which concerns on this invention. 3 is a partially enlarged cross-sectional view of the vicinity of a flow rate adjustment part A1 of the liquid fuel torch A. (A) It is sectional drawing about the crater vicinity part A2 which consists of the crater holding part 8 and the crater 9 of the liquid fuel torch A. (B) It is an enlarged view of the venturi part 7 vicinity. (C) It is a partial expanded sectional view inside a crater. It is a fragmentary sectional view about crater vicinity part A2 'which consists of crater holding | maintenance part 8' and crater 9 'of liquid fuel torch A' concerning the present invention. It is a partial model sectional view of liquid fuel torch A "(melting torch) concerning the present invention. It is a model sectional view of example B of a liquid fuel tank used with a liquid fuel torch system of the present invention.

Explanation of symbols

A, A ′, A ″ Liquid fuel torch according to the present invention A1 Flow rate adjusting part A2, A2 ′ Near crater B Liquid fuel tank 1 Auxiliary gas introduction part 2 Liquid fuel introduction part 3 Grip part 4 Auxiliary gas pipe in grip 4a Auxiliary combustion Gas path connection 4a1 Fusing oxidizing gas flow rate regulating valve 4b, 4b ', 4b "Auxiliary combustion gas path 4b3, 4b3', 4b3" Narrowest flange 5 Liquid fuel pipe in grip 5a Liquid fuel induction path connection 5b, 5b 'Liquid Fuel guiding path 5b1 Liquid fuel flow rate adjusting valve 5b2, 5b2 'Liquid fuel flow rate adjusting valve shaft 5b3 Small diameter part 5b4' Auxiliary guiding path 6, 6 'Fusing oxidizing gas path 6a Fusing oxidizing gas path connecting part 6a1 Auxiliary gas flow rate Control valve 7, 7 ', 7 "Venturi section 7a, 7a' Narrowest part of venturi section 8, 8 'Tinder holding section 8a, 8a', 8a" Mixed gas Conductor 8b Fitting portion 8c Holder inner hole 8d "Heat transfer body 9, 9 'Tinder 9a Nozzle shaft portion 9a2 Through hole 9a1 Hook-like fitting portion 9b, 9b' Narrow shape portion 9c, 9c 'Cylindrical portion 9d Tinder 1st supply path 9e Tinder second supply path 9f Tinder final supply path 9g Nozzle 9g1 Nozzle groove 9g2 First part (most part)
9g3 last part (tip part)
9h Nozzle opening 9i Gas reservoir 9j Tip end 9k Oxidation gas hole for cutting 9l Fusing gas opening 10 Felt 11a made of carbon fiber Liquid fuel supply path 11b Sampling port 11c Bottom 11d Air pump 11e Injection hole 11f Cylindrical over-injection Prevention cylinder portion 11g Pressure gauge 11h, 11i Liquid amount confirmation window 11j Safety valve 12 Fuel

Claims (8)

  A liquid fuel induction path different from the auxiliary combustion gas path, which has a venturi section in the auxiliary combustion gas path and guides the liquid fuel downstream from the narrowest section or the narrowest section in the venturi section; It is formed by atomizing and dispersing liquid fuel in the auxiliary combustion gas, partly vaporized, partly gas atomized, and partly atomized and dispersed liquid fuel and auxiliary gas guiding passage that leads to the crater A liquid fuel torch characterized by that.   A crater having a substantially cylindrical shape, and connected to the crater first supply path, the crater first supply path for supplying the mixed gas along the substantially cylindrical inner wall toward the tip of the crater; A crater second supply path that guides the mixed gas supplied by the crater first supply path toward the tip of the crater toward the crater base, and the crater second supply path that is connected to the crater second supply path. Use of a torch in the vicinity of the connecting portion between the first crater supply passage and the second crater supply passage, having a preheating supply passage composed of a crater final supply passage for supplying the mixed gas guided toward the base to the tip of the crater 2. The liquid fuel torch according to claim 1, wherein a fiber lump made of heat-resistant fibers that does not melt or deteriorate even at times is disposed.   3. The liquid fuel torch according to claim 2, wherein the crater final supply path has a narrow bottleneck part and an open road part wider than the bottleneck part.   A nozzle opening that blows out the mixed gas toward the outside from the tip of the crater is provided, and the tip of the crater is heated by the heat of the flame formed in the nozzle opening when the liquid fuel torch is used. The liquid fuel torch according to any one of claims 1 to 3, wherein   The outer shape of the crater is composed of a narrowed portion and a cylindrical portion that narrow toward the tip, and the narrowed portion is composed of a curved surface that protrudes outward. The liquid fuel torch according to any one of claims 1 to 4.   6. A heat transfer body for transferring heat from a crater is provided in a mixed gas path through which the mixed gas flows between the venturi section and a crater. Liquid fuel torch.   A liquid fuel torch system having the liquid fuel torch according to any one of claims 1 to 6, comprising a liquid fuel supply path for supplying liquid fuel to the liquid fuel torch, and a liquid fuel tank, A sampling port for supplying the liquid fuel to the liquid fuel supply path of the liquid fuel tank is provided near the bottom of the liquid fuel tank and apart from the bottom, and is provided by an air pump connected to the liquid fuel tank. The liquid fuel tank can be pressurized, and the liquid fuel tank has a sealable injection hole for injecting fuel into the interior, and a cylinder connected to the injection hole and penetrating into the tank. A liquid fuel torch system comprising a cylindrical over-injection prevention cylinder portion, and the cylinder portion prevents injection of a predetermined amount or more of liquid fuel.   The liquid fuel torch system according to claim 7, further comprising a pressure adjusting unit between the liquid fuel tank and the liquid fuel torch.

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