JPH0820059B2 - Fusing tube for fusing - Google Patents
Fusing tube for fusingInfo
- Publication number
- JPH0820059B2 JPH0820059B2 JP21024090A JP21024090A JPH0820059B2 JP H0820059 B2 JPH0820059 B2 JP H0820059B2 JP 21024090 A JP21024090 A JP 21024090A JP 21024090 A JP21024090 A JP 21024090A JP H0820059 B2 JPH0820059 B2 JP H0820059B2
- Authority
- JP
- Japan
- Prior art keywords
- fusing
- tube
- flashback
- oxygen
- fuel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は吹管内に逆火防止機構を設けた溶断用吹管に
係り、特に被加工物である鉄板等に該吹管の火口を近接
させたときに発生する逆火を防止する機構を設けた溶接
吹管若くは切断吹管に関する。TECHNICAL FIELD The present invention relates to a fusing tube for blowout having a flashback prevention mechanism provided inside the tube, and particularly, the crater of the tube is made to be close to an iron plate or the like which is a workpiece. The present invention relates to a welding blow pipe or a cutting blow pipe provided with a mechanism for preventing flashback that sometimes occurs.
「従来の技術］ 従来より、酸素／燃料ガスの予混合ガスを利用した金
属の溶接、切断に使用するための吹管において、逆火を
防ぐために種々方策が採られているが、今なおしばしば
逆火による事後例が報じられている。"Prior Art" Conventionally, various measures have been taken to prevent flashback in a blow pipe used for welding and cutting metal using a premixed gas of oxygen / fuel gas, but it is still often reverse. A post-fire example has been reported.
かかる欠点を解消するために、吹管と燃料ガス供給源
との間の流路に、逆火を防止する装置を設置すべく種々
提案されている。In order to eliminate such drawbacks, various proposals have been made to install a device for preventing flashback in the flow path between the blow pipe and the fuel gas supply source.
例えば労働安全衛生規則では、水封式安全器が規定さ
れており、アセチレンは水面下に配設された逆正弁を経
て供給する構造となっており、逆火してきても燃焼波は
水面によって阻止される構成となっている。For example, the Occupational Safety and Health Regulations stipulate a water-sealed cutout, and acetylene has a structure in which it is supplied through a reverse positive valve installed below the surface of the water. It is configured to be blocked.
また、特公昭33−7983号及び特公昭34−7226号におい
ては、逆火による燃焼波の前面を走る圧縮波によって逆
止弁を閉じ、一方燃焼波の実体は迂回路を経て逆止弁に
到るべく構成し、逆止弁の機械的慣性による弁閉止に致
るまでの時間遅れを該迂回路によって解消し逆火を阻止
する乾式安全器を提供している。In JP-B-33-7983 and JP-B-34-7226, the check valve is closed by the compression wave running in front of the combustion wave due to the backfire, while the substance of the combustion wave passes through the detour to the check valve. (EN) A dry-type safety device configured as much as possible to prevent a backfire by eliminating a time delay until a valve is closed due to mechanical inertia of a check valve by the detour.
更にISO 5175においては、溶断用吹管の附属器具とし
て、逆火防止器を規定している。この種の逆火防止器
は、吹管とアセチレン用ホースとの間に接続可能に小型
化したものであり、内蔵する焼結合金によって燃焼波を
冷却消滅させ逆火を防止するように構成している。In addition, ISO 5175 stipulates a flashback suppressor as an accessory for blowout pipes. This type of flashback suppressor is a miniaturized one that can be connected between the blowpipe and the acetylene hose, and is constructed so that the combustion wave is cooled and extinguished by the built-in sintered alloy to prevent flashback. There is.
「発明が解決しようとする技術的課題」 しかしながら前記従来技術における水封安全器に於て
は、水を利用するためにアセチレン容器毎に備えること
が困難で、工場施設内のアセチレン配管の中途或いは止
端に設置し、ゴムホースを介して吹管と接続されるに過
ぎない。"Technical problem to be solved by the invention" However, in the water-sealed safety device according to the above-mentioned conventional technology, it is difficult to provide water for each acetylene container, and the acetylene pipe in the factory facility is not provided or It is installed at the toe and is only connected to the blow pipe via a rubber hose.
また乾式安全器にあっては、構成が複雑で定期的な保
全点検が必要なこと、装置全体が大きく、又高価である
ことも相俟ってアセチレン容器に装備されているに過ぎ
ない。Further, in the dry type safety device, the structure is complicated, periodical maintenance and inspection are required, and the entire device is large and expensive.
ISO 5175に規定される逆火防止器は、小型で、特に手
持ち吹管の場合にあっても重量感を与えないため吹感に
取付可能である点は優れているものの、構造が複雑なた
めに必要な保全点検が欠かすことが出来ないこと、また
価格に比べて期待される効果が評価されていないため
か、一般的な普及を見るに致っていない。The flashback suppressor specified in ISO 5175 is small, and even if it is a hand-held blow tube, it is excellent in that it can be attached to the blow feeling because it does not give a feeling of weight, but due to its complicated structure Perhaps because the necessary maintenance inspections are indispensable and the expected effect compared with the price has not been evaluated, it is not enough to see general spread.
本発明はかかる従来技術の欠点に鑑み、実質的に機械
的動作部材を採用する事なく複雑な構造を避け、又特に
手持ち吹管内に組込み可能に小型軽量化し、正確且つ確
実に而も経時的精度劣化が生ぜず実質的に保全点検が不
要の吹管用逆火防止機構を設けた溶断用吹管を提供する
事を目的とする。In view of the above-mentioned drawbacks of the prior art, the present invention avoids a complicated structure substantially without employing a mechanical operating member, and is particularly compact and lightweight so that it can be incorporated in a hand-held blow tube, and it can be accurately and reliably maintained over time. An object of the present invention is to provide a blowout blower tube provided with a blowback flashback prevention mechanism that does not substantially deteriorate the accuracy and does not require maintenance inspection.
「課題を解決する為の技術手段」 本発明は、火口部先端を被加工物に極力近接させた際
に該火口部内の混合ガスの圧力が上昇するように、燃焼
ガス通路の所定個所に一又は複数の絞り機構を設けたこ
とを特徴とする溶断用吹管を提案する。“Technical Means for Solving the Problem” The present invention is designed to prevent the tip of the crater portion from approaching the workpiece as much as possible so that the pressure of the mixed gas in the crater portion rises so that the combustion gas passage has a predetermined location. Alternatively, a blowing tube for fusing is proposed which is provided with a plurality of throttle mechanisms.
より具体的には、イ）該溶断用吹管は酸素及び燃料ガ
スを混合するミクシング部を有する吹管であるので、該
ミクシング部に至近位置の燃料ガス通路に前記絞り機構
を設ける。ロ）該溶断用吹管には酸素／燃料ガス混合部
に供給する燃料ガスの開閉制御を行う燃料バルブを有す
るので、該燃料バルブの弁体上流側に前記絞り機構を設
ける。更に、ハ）該燃料バルブの入口側に取り付けたホ
ース口内部に前記絞り機構を設けたことを特徴とする溶
断用吹管を提案する。More specifically, (a) the fusing tube for blowing is a blowing tube having a mixing portion for mixing oxygen and fuel gas, so that the throttle mechanism is provided in the fuel gas passage located in the vicinity of the mixing portion. B) Since the fusing tube for blowing has a fuel valve for controlling the opening and closing of the fuel gas supplied to the oxygen / fuel gas mixing portion, the throttle mechanism is provided on the upstream side of the valve body of the fuel valve. Further, c) a blowing tube for fusing, which is characterized in that the throttling mechanism is provided inside the hose port attached to the inlet side of the fuel valve.
なお、溶断用吹管は、単に溶接用吹管及び切断用吹管
に限定されず、加熱吹管、スカーフィング吹管、ガウジ
ング吹管等の手持ち吹管、更に、機械に搭載する吹管も
含む。Note that the fusing tube for fusing is not limited to the welding blowing tube and the cutting blowing tube, and includes a hand-held blowing tube such as a heating blowing tube, a scarfing blowing tube, and a gouging blowing tube, and also a blowing tube mounted on a machine.
また後記実施例では、予混合炎として酸素／アセチレ
ン炎で説明しているが、本発明の燃料ガスはアセチレン
のみに限定されず、例えばLPガス、エチレン、水素等を
用いてもよい。Further, in the examples described later, the oxygen / acetylene flame is described as the premixed flame, but the fuel gas of the present invention is not limited to acetylene, and for example, LP gas, ethylene, hydrogen or the like may be used.
「作用」 かかる技術手段によれば、点火したままの状態で火口
を鉄板に押し付けたとき、燃料ガス通路中に設けた絞り
機構により該火口部内のガス圧力が高くなり、従って混
合ガスが火口から噴出する速度も速くなり、火口に於け
る混合ガスの燃焼速度より大となり逆火を起こさない。
即ち、第２図の酸素／アセチレンの混合比と火口におけ
る流速との関係図に於て▲▼の経路をたどり、途
中ｄ点において炎がブローし逆火を防ぐいことが可能と
なる。[Operation] According to the technical means, when the crater is pressed against the iron plate in a state of being ignited, the gas pressure in the crater portion is increased by the throttle mechanism provided in the fuel gas passage, so that the mixed gas is discharged from the crater. The jetting speed also becomes faster, which is higher than the burning speed of the mixed gas at the crater, and does not cause flashback.
That is, in the relationship diagram between the oxygen / acetylene mixture ratio and the flow velocity at the crater shown in FIG. 2, it is possible to follow the route of ▼ and blow the flame at point d to prevent flashback.
又、絞り機構をホース継手等に設けたオリフィスであ
るなら、経時的な劣化等もなく、長期間に亙って逆火防
止作用を維持できる。Further, if the orifice mechanism is provided with the throttle mechanism in the hose joint or the like, it is possible to maintain the flashback prevention function for a long period of time without deterioration over time.
更に、保全を必要と考えられる点は、オリフィスに塵
埃が詰ることで、これはフィルタを設けることで容易に
排除できる。Further, a point that requires maintenance is that the orifice is clogged with dust, which can be easily eliminated by providing a filter.
「実施例」 以下、図面に基づいて本発明の実施例を例示的に詳し
く説明する。但しこの実施例に記載されている構成部品
の寸法、材質、形状、その相対配置などは特に特定的な
記載がない限りは、この発明の範囲をそれのみに限定す
る趣旨ではなく単なる説明例に過ぎない。[Examples] Examples of the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative positions and the like of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely examples, unless otherwise specified. Not too much.
第１図は、本発明が適用される手持ち吹管の断面図で
あり、同図において、１は酸素ホース（不図示）と接続
する酸素ホース口で、袋ナット２によって吹管の後部本
体３に固着される。酸素通路は、該後部本体３と前部本
体６とに漏洩不能にろう付けされた内部パイプ４、前部
本６内に削孔された酸素通路27を経て、針弁棒22がミク
サノズル23背面と接する空間29に致る部材によって形成
される。FIG. 1 is a cross-sectional view of a hand-held blow tube to which the present invention is applied. In FIG. 1, 1 is an oxygen hose port connected to an oxygen hose (not shown), which is fixed to a rear main body 3 of a blow tube by a cap nut 2. To be done. The oxygen passageway passes through the inner pipe 4 which is brazed to the rear body 3 and the front body 6 so as not to leak, and the oxygen passage 27 which is drilled in the front body 6, and the needle valve rod 22 is connected to the rear surface of the mixer nozzle 23. It is formed by a member that fills the space 29 that contacts with.
一方、アセチレン通路は、アセチレン供給装置に接続
したアセチレンホース（不図示）と接続し後部本体３に
袋ナット２によって固着されたアセチレンホース口11、
燃料バルブ10、後部本体３と前部本体６と漏洩不能にろ
う付けされた内部パイプ５、前部本体６に削孔された燃
料通路28を経て、ミクサノズル23の前面の空間30に致る
部材によって形成される。On the other hand, the acetylene passage is connected to an acetylene hose (not shown) connected to the acetylene supply device, and the acetylene hose port 11, which is fixed to the rear body 3 by the cap nut 2,
A member that fills the space 30 in front of the mixer nozzle 23 through the fuel valve 10, the rear main body 3, the front main body 6, the leak-proof brazed internal pipe 5, and the fuel passage 28 drilled in the front main body 6. Formed by.
なお、７は後部本体３と前部本体６とにろう付けさ
れ、作業者が吹管を握る握り管である。Reference numeral 7 is a grip pipe brazed to the rear main body 3 and the front main body 6 so that an operator grips the blow pipe.
更に、混合ガス通路は、内部に削成されたスロート31
及び拡大部32、袋ナット25によって前部本体６に螺着さ
れる混合管24、他の一端は火口台40に漏洩不能にろう付
けされた混合ガス管26、及び火口台40を経て火口41のポ
ート42に致る部材によって形成される。In addition, the mixed gas passage has a throat 31
And the enlarged portion 32, the mixing pipe 24 screwed to the front body 6 by the cap nut 25, the mixed gas pipe 26 brazed at the other end to the crater base 40 so as not to leak, and the crater 41 via the crater base 40. Is formed by a member that fits in the port 42 of the.
かかる機構によれば、酸素、アセチレンの供給圧力を
夫々３〜6kgf/cm2（以下、圧力は絶対圧力）、1.3〜1.6
kgf/cm2程度に調整し、吹管にゴムホースを介して供給
し、燃料バルブ10及びミクサバルブ20を適宜開き、火口
41の先で点火すれば火口41に酸素／アセチレン予混合炎
が形成される。燃料バルブ10及びミクサバルブ20は、夫
々ツマミ13或いはツマミ21を回動することにより、弁棒
14或いは針弁棒22が螺動し夫々のガス流量（混合比）が
調節できる。According to this mechanism, the supply pressures of oxygen and acetylene are 3 to 6 kgf / cm 2 (hereinafter, the pressure is absolute pressure) and 1.3 to 1.6, respectively.
Adjust to about kgf / cm 2 , supply to the blow pipe through a rubber hose, open the fuel valve 10 and the mixer valve 20 appropriately, and open the crater.
When ignited at the tip of 41, an oxygen / acetylene premixed flame is formed at the crater 41. The fuel valve 10 and the mixer valve 20 are operated by rotating the knob 13 or the knob 21, respectively, so that the valve rod
14 or the needle valve rod 22 is screwed to adjust each gas flow rate (mixing ratio).
なお、鋼のガス溶接においては酸素とアセチレンの流
量比は1.1:1程度が適当であるとされており、またガス
切断においても同様の流量比が準用されており、その流
量はポート42の直径の大きさによるが、0.1〜1m3/h程度
である。It should be noted that in gas welding of steel, a flow rate ratio of oxygen and acetylene of 1.1: 1 is said to be appropriate, and the same flow rate ratio is also applied for gas cutting.The flow rate is the diameter of port 42. Depending on the size, it is about 0.1 to 1 m 3 / h.
更に第１図（Ｂ）に、燃料バルブ10のホース継手部18
の内部に、本願発明の特徴とする絞り機構としてのオリ
フィス15、及び焼結合金製のフィルタ16をオルフィスね
じ17によって固定した例を示す。Further, in FIG. 1 (B), the hose joint portion 18 of the fuel valve 10 is
An example in which an orifice 15 as a throttle mechanism, which is the feature of the present invention, and a filter 16 made of a sintered alloy are fixed in the inside by means of an Orphis screw 17 is shown.
また第１図（Ｃ）において本願発明の特徴である絞り
機構の他の実施例として、燃料バルブの継手部18と接続
する側に削成されたオルフィス15a（オリフィスの直径1
mm程度）とともに圧入されたフィルタ16を備えたホース
口11（内径５〜6mm程度）を示す。Further, as shown in FIG. 1 (C), as another embodiment of the throttle mechanism which is the feature of the present invention, an Orphis 15a (orifice diameter 1
The hose port 11 (about 5 to 6 mm in inner diameter) is provided with the filter 16 press-fitted together with (about mm).
更に第１図（Ａ）において、前部本体６に削孔された
燃料通路28の内径を必要な程度に細くして、該絞り機構
としても良い。Further, in FIG. 1 (A), the inner diameter of the fuel passage 28 drilled in the front main body 6 may be made as thin as necessary to form the throttle mechanism.
次にかかる実施例の作用を中心に第２図により説明す
る。Next, the operation of this embodiment will be mainly described with reference to FIG.
第２図は、横軸は酸素／アセチレン予混合ガスの容積
比率％，縦軸にポート42に於ける予混合ガスの流速を採
ったときのポートに形成される予混合炎の態様を示す概
念図である。また、縦軸には、該流速が得られる火口内
部の予混合ガスの圧力も重ねて採り、図中には破線で経
路を示している。In FIG. 2, the horizontal axis represents the oxygen / acetylene premixed gas volume ratio%, and the vertical axis represents the premixed flame formed in the port when the flow velocity of the premixed gas in the port 42 is taken. It is a figure. The vertical axis also shows the pressure of the premixed gas inside the crater at which the flow velocity can be obtained, and the path is indicated by a broken line in the figure.
第２図において、Ｉの領域は、酸素に比べてアセチレ
ンの割合が大きいため、ポートには煤を含む炎が形成さ
れる。IIの領域は、溶接作業・切断作業を行う予混合炎
の領域で、IIIの領域は炎が形成されない領域で、IIとI
IIの領域境界では、しばしば炎がブローするか、ポート
から浮き上がった炎が見られる。IVの領域は、問題とす
る逆火領域で、予混合ガスの流速が小さいときに逆火を
することが分る。混合比が化学当量混合比（アセチレ
ン：酸素＝1:2.5＝28.6:71.4）のとき速度が最高になる
ことが期待されるが、実際には多少アセチレンの濃度が
過剰の点（アセチレン：酸素＝35:65）に最高速度に達
する。In FIG. 2, in the region I, the proportion of acetylene is larger than that of oxygen, so a flame containing soot is formed in the port. Area II is a premixed flame area where welding and cutting work is performed, and area III is an area where no flame is formed.
At the II boundary, flames often blow or rise from the port. The IV region is the flashback region in question, and it can be seen that flashback occurs when the flow velocity of the premixed gas is low. It is expected that the speed will be highest when the mixing ratio is a chemical equivalence mixing ratio (acetylene: oxygen = 1: 2.5 = 28.6: 71.4), but in reality, the concentration of acetylene is slightly excessive (acetylene: oxygen = The maximum speed is reached at 35:65).
逆火領域IVが混合ガスの流速が小さい領域に在り、且
つ混合ガスの燃焼反応が速い組成では流速が大きく膨れ
ることは、ポートにおける混合ガスの流速と、その混合
比における混合ガスの燃焼速度との拮抗により、言換え
ると、前者の速度より後者の速度が勝ったときに逆比が
起こると理解すれば、当然の帰結となる。The flashback region IV is in a region where the flow velocity of the mixed gas is small, and the flow velocity greatly expands in a composition in which the combustion reaction of the mixed gas is fast, because the flow velocity of the mixed gas at the port and the burning velocity of the mixed gas at the mixing ratio are In other words, it is a natural consequence of understanding that the inverse ratio occurs when the speed of the latter exceeds the speed of the former by the antagonism of.
逆火領域IVを理解するため、燃料バルブ10とミクサバ
ルブ20を同時に操作し混合比を一定に保ちながら閉止す
る事例を見てみる。第２図に於て、作業をしていた予混
合炎の位置がＡ点であったとすると、上記の条件ではＡ
点から垂直に流速を下げ、ｂ点で逆火領域IVに達し炎は
吹管内部に侵入し逆火する。To understand flashback region IV, let's look at an example where fuel valve 10 and mixer valve 20 are simultaneously operated to close while maintaining a constant mixing ratio. In FIG. 2, assuming that the position of the premixing flame that was being worked is point A, under the above conditions, A
The flow velocity is reduced vertically from the point, reaches the flashback region IV at the point b, and the flame penetrates the inside of the blow tube and flashes back.
逆火現象は大別して２種類あり、パチッと音を立てて
逆火し続いて混合管24の拡大部32からスロート31にかけ
て混合ガス管26内部で接続して燃焼を続ける場合（持続
逆火）と、単にパチッと音を立てて逆火はするものの、
混合ガス管内部で持続して燃焼しない場合（狭義の逆
火）とがある。狭義の逆火と持続逆火の機構が不明であ
るので、第２図に於て両者を区別して表していない。し
かし、持続逆火は逆火領域IVの中に含まれることは確か
である。There are roughly two types of flashback phenomena, and when flashback occurs with a clicking sound and then the combustion is continued by connecting inside the mixed gas pipe 26 from the expanded portion 32 of the mixing pipe 24 to the throat 31 (continuous flashback). And, although it makes a snapping sound and flashback,
There are cases where combustion does not continue inside the mixed gas pipe (narrowly defined flashback). Since the mechanism of flashback in a narrow sense and continuous flashback is unknown, they are not shown separately in Fig. 2. However, continuous flashback is certainly included in flashback area IV.
第２の事例として、本発明の絞り機構を設けていない
従来技術の吹管において、点火したまま火口41を鉄板に
押し付けた場合を考えてみる。As a second example, consider a case where a blast mouth 41 is pressed against an iron plate while being ignited in a conventional blow tube in which the throttle mechanism of the present invention is not provided.
ミクサバルブ20は、開いたままであるので酸素は噴出
し続ける。前記のとおり、酸素、アセチレンの供給圧力
は夫々３〜6kgf/cm2、1.3〜1.6kgf/cm2程度であるの
で、ミクサノズル23から噴出する酸素の圧力と噴出先の
雰囲気の圧力との比が1.89である間は、酸素の噴出速度
はその温度に於ける音速である。しかし、ミクサノズル
23を噴出した酸素は、混合ガス管26に流入するよりも多
量に、燃料通路28、内部管５、燃料バルブ10、ホース口
11を経て、アセチレンホースに致り、両者の圧力が等し
くなるまで逆流を続ける。言換えると、ポート42が完全
に閉塞するまでの短時間に於ては、混合ガス管内の圧力
は当初の水柱数10mmから殆ど変化せず、火口内部の圧力
が上昇しないまま酸素濃度が高くなる方向▲▼に
移動し、途中ｃ点に於て逆火する（第２図参照）。The mixer valve 20 remains open so that oxygen continues to blow out. As the oxygen supply pressure of acetylene are each 3~6kgf / cm 2, because it is about 1.3~1.6kgf / cm 2, the ratio between the pressure of the oxygen pressure and ejection destination of the atmosphere to be ejected from Mikusanozuru 23 While at 1.89, the oxygen ejection rate is the speed of sound at that temperature. But the mixer nozzle
The amount of oxygen ejected from 23 is larger than that flowing into the mixed gas pipe 26, the fuel passage 28, the inner pipe 5, the fuel valve 10, the hose port.
After 11, hit the acetylene hose and continue backflow until both pressures become equal. In other words, in the short time until the port 42 is completely closed, the pressure inside the mixed gas pipe hardly changes from the initial water column number of 10 mm, and the oxygen concentration rises without increasing the pressure inside the crater. It moves in the direction ▲ ▼ and flashes back at point c (see Fig. 2).
最後の事例として、本発明の絞り機構を設けた溶断用
吹管において、点火したまま火口41を鉄板に押し付けた
場合を考えてみる。As a final example, consider a case in which the crater 41 is pressed against the iron plate while ignited in the fusing tube for blowout provided with the throttle mechanism of the present invention.
混合ガス管内の圧力は、絞り機構により逆流が阻止さ
れるので、当初の水柱数10mmから（酸素供給圧力）/1.8
9に致るまで上昇する。ポート42が完全に閉塞するまで
の短時間に於ては、火口内部の圧力は第２図の▲
▼線を辿って直線的に上昇する。このように上昇する
圧力を受けて、ポート42から吐出する混合ガスの速度も
上昇しながら、また酸素濃度も高くなりながら第２図の
▲▼線を辿って上昇し、ポート42が閉塞すること
により、流速がゼロとなるＤ点に致る。途中ｄ点でブロ
ー線を過り炎は消火する。Since the backflow of the pressure inside the mixed gas pipe is blocked by the throttling mechanism, the initial number of water columns is 10 mm (oxygen supply pressure) /1.8
Rise until you hit 9. For a short time until the port 42 is completely closed, the pressure inside the crater is ▲ in Fig. 2.
▼ Follow the line and rise linearly. In response to such rising pressure, the speed of the mixed gas discharged from the port 42 increases, and the oxygen concentration also increases, following the ▲ ▼ line in FIG. Thus, the point reaches the point D where the flow velocity becomes zero. The flame extinguishes by passing the blow line at point d on the way.
このように、絞り機構を設けることにより、第２図に
於ける経路は逆火領域IVより離れる方向に遷移するの
で、無装備の溶断用吹管に比べて安全な吹管を影響する
ことができる。As described above, by providing the throttling mechanism, the path in FIG. 2 shifts in the direction away from the flashback region IV, so that the safe blow pipe can be affected as compared with the unblown blow blow pipe.
なお、該絞り機構がミクサノズル23の前部の空間30に
近ければ近いほど、混合ガス管26の圧力（ポートに於け
る流速）を急勾配に上昇することが期待される。従っ
て、燃料通路28そのものを絞り機構とするなら、好まし
い効果を得られる（第１図参照）。It is expected that the closer the throttle mechanism is to the space 30 in the front part of the mixer nozzle 23, the steeperly the pressure of the mixed gas pipe 26 (the flow velocity at the port) will rise. Therefore, if the fuel passage 28 itself is a throttling mechanism, a desirable effect can be obtained (see FIG. 1).
但し、燃料通路28の削孔径は設計製作段階で決定さ
れ、想定したポート径以上の大きな火口については、使
用不能となる。この観点から、ホース口11または燃料バ
ルブ10の継手部18に絞り機構を設けることは、好ましい
解決方法となる。特に、ホース口に絞り機構を設けるな
らば、ポート42の直径が大幅に違う火口を付替えて使用
する際にも、夫々の流量に対応する各種オリフィス15a
を備えた複数のホース口11の中から選択し対応すること
が出来る。However, the hole diameter of the fuel passage 28 is determined at the designing and manufacturing stage, and a crater larger than the assumed port diameter cannot be used. From this point of view, providing a throttle mechanism at the hose port 11 or the joint portion 18 of the fuel valve 10 is a preferable solution. In particular, if a throttling mechanism is installed at the hose port, various orifices 15a corresponding to the respective flow rates can be used even if the crater with a significantly different diameter of the port 42 is used.
It is possible to respond by selecting from a plurality of hose openings 11 equipped with.
今一度第２図に立返って、本願発明の予混合炎がポー
トを閉塞されたとき消火するまでの経路▲▼を参
照して、絞り機構の在るべき姿を考えてみる。Referring back to FIG. 2 again, let us consider the ideal form of the throttle mechanism by referring to the path (▼) until the premixed flame of the present invention extinguishes when the port is blocked.
絞り機構は少なくとも火口のポート口径に応じた最大
流量を満足するものでなくてはならない。更に、必要以
上に規制しなくても、ポート42を閉塞したときポートに
於ける流速（混合ガス管26の圧力）の上昇勾配が、少な
くとも逆火領域IVのｂ点に於ける接線の勾配と等しけれ
ば満足できる。The throttling mechanism must satisfy at least the maximum flow rate corresponding to the port diameter of the crater. Further, even if it is not regulated more than necessary, when the port 42 is closed, the rising gradient of the flow velocity (pressure of the mixed gas pipe 26) at the port is at least equal to the gradient of the tangent line at point b of the flashback region IV. If they are equal, we can be satisfied.
即ち、溶断用吹管に使用される予混合炎の混合比は略
1:1であり、第２図の上では炎の作業点Ａは▲▼
線及びその上方延長線上に在り、また、逆火領域IVのｂ
点から頂上にかけて曲率が上に凸の曲線であるので、上
記勾配条件を満足するなら混合炎の経路▲▼線
は、逆火領域IVを過ることはなく、途中ｄ点でブローし
て消火する。即ち、逆火することのない吹管を提供でき
たことになる。That is, the mixing ratio of the premixed flame used for the blowout blow tube is almost
It is 1: 1 and the working point A of the flame is ▲ ▼ in Fig. 2.
On the line and its extension, and b in flashback area IV
Since the curvature is a convex curve from the point to the top, if the above-mentioned gradient condition is satisfied, the line ▲ ▼ of the mixed flame does not pass through the flashback region IV, and blows at the point d on the way to extinguish the fire. To do. That is, it means that a blow tube that does not flash back can be provided.
なお、ISO 5172に於て吹管の逆火試験を、この火口を
押し付ける方法に依って吹管の耐逆火性能を試験する方
法が規定されている。即ち、銅板の表面に４本の溝を掘
り、その上を点火した火口を押し付けながら滑らせる。
１回の試験で、５回完全に閉塞し、４本の溝を通るとき
４回一部閉塞することになり、この試験を１分間に５回
連続して行う。即ち、火口は、１分間に５×５＝25回完
全に閉塞され、５×４＝20回一部閉塞されることにな
る。合否判定基準は、この試験を行って持続逆火を起こ
してはならないとしている。但し、炎の条件は、供給者
が指定する流量を基準にしている。In addition, ISO 5172 stipulates a method of testing the flashback resistance of the blowpipe by performing a flashback test of the blowpipe by pressing the crater. That is, four grooves are dug in the surface of the copper plate, and the ignited crater is pressed against the groove and made to slide.
One test results in complete closure 5 times and partial closure 4 times when passing through 4 grooves, and this test is performed 5 times continuously for 1 minute. That is, the crater is completely blocked 5 × 5 = 25 times per minute and partially blocked 5 × 4 = 20 times per minute. Pass / Fail criteria stipulate that this test should not be used to cause a continuous flashback. However, the flame condition is based on the flow rate specified by the supplier.
任意に選択した同種火口２本について、直径1.0mmの
オリフィスを設けたホース口11と通常のホース口を付替
えて試験をした結果を、次の表に示す。The following table shows the test results of two arbitrarily selected craters of the same type, with the hose port 11 provided with an orifice having a diameter of 1.0 mm and the normal hose port replaced.
僅か数例ではあるが、オリフィスが（持続）逆火を防
止することに効果が有ることが分る。 It can be seen that, in just a few examples, the orifice is effective in preventing (continuous) flashback.
「効果」 以上記載した如く本発明によれば、吹管内部或いは吹
管に附属するホース口に絞り機構を設けたものであるた
めに、ことさら装置として準備することなく、火口が鉄
板等に押し付けられたときに逆火を防止できる吹管を提
供できる。[Effect] As described above, according to the present invention, since the throttle mechanism is provided inside the blower pipe or at the hose mouth attached to the blower pipe, the crater is pressed against the iron plate or the like without further preparing as a device. A blow tube that can prevent flashback can be provided.
絞り機構をオリフィスとしたことで、確実に而も経時
的精度劣化が生じる事のない逆火防止の吹管を提供し得
る。By using the throttle mechanism as an orifice, it is possible to reliably provide a blowback tube for preventing flashback without causing accuracy deterioration with time.
更に、機械に搭載する複数の切断吹管にあっては、切
断される鉄板の熱歪等による凹凸が有っても火口が鉄板
に当り、そのために起こる逆火の心配をしなくても済む
吹管を提供し得る。Further, in a plurality of cutting blowers installed in a machine, even if there is unevenness due to thermal distortion of the iron plate to be cut, the crater hits the iron plate, and there is no need to worry about flashback due to that. Can be provided.
等の種々の著効を有す。It has various remarkable effects.
第１図（Ａ）（Ｂ）（Ｃ）は本発明の構成を示す正面図
で、第１図（Ａ）は全体構成を示す断面図、第１図
（Ｂ）（Ｃ）は、本実施例に係わる燃料バルブ継手部、
ホース口内部を示す要部断面図、第２図は、横軸に混合
ガスの酸素／アセチレン予混合ガスの容積比率％、縦軸
に火口のポートに於ける混合ガスの流速（及び火口内部
の混合ガスの圧力）を採ったときの炎の状態、及び本発
明の作用を示す図である。1 (A), (B) and (C) are front views showing the constitution of the present invention, FIG. 1 (A) is a sectional view showing the whole constitution, and FIGS. Fuel valve fitting according to example,
FIG. 2 is a cross-sectional view of the main part showing the inside of the hose mouth. In FIG. 2, the horizontal axis shows the oxygen / acetylene premixed gas volume ratio% of the mixed gas, and the vertical axis shows the flow rate of the mixed gas at the crater port (and the inside of the crater). It is a figure which shows the state of the flame when taking the pressure of mixed gas), and the effect | action of this invention.
Claims (4)
に該火口部内のガス圧力が上昇するように、燃料ガス通
路の所定個所に一又は複数の絞り機構を設けたことを特
徴とする溶断用吹管1. One or a plurality of throttling mechanisms are provided at predetermined locations in the fuel gas passage so that the gas pressure in the crater portion rises when the tip of the crater portion is brought as close as possible to the workpiece. Blow tube for fusing
を有する溶断用吹管において、前記ミクシング部に至近
位置の燃料ガス通路に絞り機構を設けたことを特徴とす
る溶断用吹管2. A fusing tube for fusing having a mixing portion for mixing oxygen and fuel gas, wherein a constriction mechanism is provided in a fuel gas passage located in the vicinity of the mixing portion.
スの開閉制御を行う燃料バルブを有する溶断用吹管にお
いて、該燃料バルブの弁体上流側に絞り機構を設けたこ
とを特徴とする溶断用吹管3. A fusing tube for fusing, which has a fuel valve for controlling opening / closing of a fuel gas supplied to an oxygen / fuel gas mixing portion, wherein a throttle mechanism is provided upstream of the valve body of the fuel valve. Fusing tube for fusing
スの開閉制御を行う燃料バルブを有する溶断用吹管にお
いて、該燃料バルブの入口側に取り付けたホース口内部
に絞り機構を設けたことを特徴とする溶断用吹管4. A blowout pipe having a fuel valve for controlling opening / closing of a fuel gas supplied to an oxygen / fuel gas mixing section, wherein a throttle mechanism is provided inside a hose port attached to an inlet side of the fuel valve. Fusing tube for fusing
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21024090A JPH0820059B2 (en) | 1990-08-10 | 1990-08-10 | Fusing tube for fusing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21024090A JPH0820059B2 (en) | 1990-08-10 | 1990-08-10 | Fusing tube for fusing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0493506A JPH0493506A (en) | 1992-03-26 |
| JPH0820059B2 true JPH0820059B2 (en) | 1996-03-04 |
Family
ID=16586105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21024090A Expired - Lifetime JPH0820059B2 (en) | 1990-08-10 | 1990-08-10 | Fusing tube for fusing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0820059B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2410200B (en) * | 2004-01-23 | 2007-01-03 | Irwin Ind Tool Co | Efficient vaporization torch valve |
| JP4803712B2 (en) * | 2005-08-31 | 2011-10-26 | 第一産業株式会社 | Gas stabilizer flame stabilizer |
| KR100799356B1 (en) * | 2007-07-26 | 2008-01-30 | 제이아이산업(주) | Cock-pin handle with stopper function |
| KR100827836B1 (en) * | 2007-10-20 | 2008-05-07 | 제이아이산업(주) | Safety handle for gas torch with stopper function |
| CN110355534B (en) * | 2019-07-29 | 2021-04-09 | 湖州阳力钢结构有限公司 | Steel structure steel pipe machining method |
-
1990
- 1990-08-10 JP JP21024090A patent/JPH0820059B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0493506A (en) | 1992-03-26 |
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