JPS60253709A - Torch with head-mixer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a torch. More particularly, the present invention relates to a straight-cut or attachment-type cutting torch having multiple passageways for supplying cutting oxygen and an oxygen-fuel mixture.

In a particular aspect of the invention, the invention relates to an improvement in a cutting machine employing an integral head mixer.

The advent of welding quickly solved many of the problems that had previously plagued manufacturers. Instead of sending items back to the factory for repair, repair workers can now perform various repair tasks on-site by using torches such as cutting torches, welding torches, and heating torches. . Until now, Iro℃ and Rona type torches have been used. One conventional type is known as the injector type mixer, in which one of the gases flowing through the preheating tube is released in a high-velocity stream, sucking out the other gas and mixing with it. Heating is performed before using oxygen for cutting. In theory, injector-type mixers offer a lot more flexibility than other types of mixers. However, in actual use, the injector-type mixer is relatively inexpensive, provides long-lasting combustion in the event of backfire, and has the advantage that when using certain fuel gases such as acetylene, the torch will not ignite. There is a tendency to rise. Previous injector designers simplified the construction of the torch and
It has been attempted to alleviate difficult problems associated with conventional devices such as backfire.

One way in which conventional torch designers have attempted to eliminate the occurrence of flashbacks has been to use passages of extremely small diameter to supply, for example, oxygen and fuel gases.

A variety of conventional torches are disclosed in US patents.

This includes patents such as U.S. Pat. No. 2,198,342, which also shows the use of mixing screws.
U.S. Patent No. 1,26 originally published in April 918
No. 2,351 may be mentioned as another patent. US Pat. No. 1,276.893 shows an intricately designed passageway to prevent torch flashback. U.S. Pat. No. 2,263,655 shows a pipe compling with spiral fins. U.S. Patent No. 2,19
No. 8,342 shows the use of mixers and oxygen extraction jets. However, experience using torches disclosed in prior patents shows that when using different fuel gases, unless the mixer and mixer orifice are changed, combustion may persist when flashback occurs. It has been revealed that there is. As a result of the use of a large number of small diameter holes, it was found that the construction of a torch with holes drilled into the head from various directions was very expensive. Additionally, the use of multiple tubes welded to a common head with integral mixer passages has been relatively impractical and expensive.

This is because, in order to eliminate flashbacks, numerous passages are drilled to draw oxygen in and mix it with the fuel. U.S. Pat. No. 4,248,384 describes these difficult problems and suggests that one way to solve them is to use channels drilled at different diameters in the head. . The following US patent adopts a different approach from this patent. i.e., U.S. Patent No. 2,371,970L No. 2,52
No. 0,018 discloses another type of cutting torch using a chip mixer. U.S. Patent No. 3,091
, No. 281 also discloses a torch using a chip mixer. U.S. Pat. No. 4,022,441, assigned to the same assignee as the present application, is a patent for an invention by Lari Tahni that discloses a structure made of copper that dissipates heat and reduces backfire problems. Discloses the use of a spiral body. A related patent is US Pat. No. 4,409,002, but it is expensive to manufacture.

U.S. Pat. No. 4,248,384 and No. 4, listed above.
Despite the improved operability described in No. 409,002, further improvements can be made to reduce the cost of producing a torch with an integrated head mixer. It seems that there is.

Therefore, the prior patent provides a very simple and easy to use method for attaching an integrated head mixer to the cutting torch in order to alleviate the difficult problems associated with conventional torches such as sustained combustion during flashback. Please understand that we do not provide a head that is both targeted and easy to manufacture.

It is therefore an object of the present invention to eliminate the tendency for combustion to persist during flashback and the disadvantages associated with conventional torches, and to be economically and easily fabricated without the need for drilling numerous small diameter holes. To provide a torch configured to exhibit the usefulness of a torch equipped with an integrated head mixer.

Another object of the invention is the utility of a mixer torch having a mixer mounted in the head that operates using gaseous welding fuels, which alleviates the difficult problems associated with conventional torches. In addition to providing a cutting torch that is capable of
It is to provide a type of mixer.

Other objects of the invention will become more clearly understood from a perusal of the following description, made with reference to the bisexual drawings, in which: FIG.

To achieve the above objectives, it is possible to eliminate the tendency for flashback and sustained combustion when using certain fuels, such as acetylene, and to reduce the flexibility associated with a one-piece head mixer torch. According to the invention, a torch equipped with the following is proposed. A straight line cutting torch or torch and torch combination has three sections: a cutting oxygen valve and passage, a preheating oxygen valve and passage, a fuel gas valve and a passage, and a tip end for identification of the tip to the head. It consists of a head having a head passage through which cutting oxygen passes and a head passage through which a mixture of fuel and oxygen passes, and has been improved as described below. That is,
A torch improved in accordance with the present invention further includes an integral head mixer having a preheated oxygen passage and a fuel passage in the head, and a mixer and a fuel passage disposed within the preheated oxygen passage. a mixer insert with mating sealing means for inhibiting the flow of preheated oxygen through the insert, the mixer insert having a central hole with an inlet end of the central hole at a temperature of communicating with the preheating oxygen passageway and having its discharge end communicating with a passageway consisting of at least six small holes, the small holes extending radially outwardly at an acute angle downstream with respect to the longitudinal axis of the central hole; It is characterized by extending in the direction. A passageway consisting of apertures terminates downstream of the sealing means and directs the flow of preheated oxygen into an annular groove through which fuel passes. Since the area of the annular space between the insert and the wall of the head passageway through which the mixture passes is approximately the same as the total area of the passageway consisting of the small holes, the preheated element is heated within the head within a short time. It mixes well with the fuel, eliminating the problem of dangerous and damaging flashbacks. According to an advantageous embodiment of the invention, the insert includes first and second holes aligned in a horizontal direction, the first hole being sized to a first diameter. and a heat dissipating spiral, 'while the second hole has a second diameter smaller than the tenth diameter.
and extending generally outwardly from the sealing means to a passageway comprising a stoma. The sealing means consists of retainable debris, an insert and a recess formed in the preheated oxygen passageway. The channel consisting of small holes has four small holes (and the ratio of the area of the annular space to the total area of the channel consisting of small holes is 0.4:1 to 2).
It is desirable that the ratio be within a range of up to 1:1. Preferably, the area ratio is 1.1:1.

The present invention utilizes the preheated oxygen and fuel flow described in U.S. Patent No. 4.40.
It is based on the surprising discovery that the flow of the torch disclosed in No. 9,002 can be reversed, saving manufacturing and assembly costs.

The present invention will now be described in detail with reference to the accompanying drawings, which illustrate embodiments of the invention.

Now, if you refer to Figure 1, you can see that the cut-F! The fr type 1-chi 11 is not shown in the figure. The cutting torch 11 has a torch head 2 with a tip end 29
7, a main body 31, and a connecting tube 66 surrounded by a case 34.

Although detailed explanation of the content of the invention is omitted,
The six tubes 33 are welded, silver brazed, etc., as described in U.S. Pat. No. 4,248,384, a summary of which is incorporated herein by reference. It is integrally connected to the torch head 27 by. As can be seen from FIGS. 1 and 7, the six tubes include a cutting oxygen tube 35 with a cutting oxygen passageway 37 running lengthwise through it, and a cutting oxygen passageway 41 with a passageway 41 through which fuel and oxygen can pass. It is composed of a fuel tube 39 extending longitudinally therethrough, and a preheated oxygen tube 43 extending longitudinally with a passage 45 through which preheated oxygen passes. These tubes are each integrally fixed to the main body 61 by welding, silver brazing, etc., and are connected to the cutting oxygen valve 4.
It is connected to a cutting oxygen passage 47 to which a cylinder 8 is attached, a preheating oxygen passage communicating with a preheating oxygen valve 49, and a fuel passage communicating with a fuel valve 51.

The torch head, like that used by welders, is
・It is a so-called right-angle bending torch head, and the tip of the torch can be bent downward by about 90 degrees from the main body of the torch, making it easy to observe the progress of work. In other cases, the torch head may have other orientations, such as a straight head, such as those employed in mechanical bath welding operations. It can be anything.

As shown, the torch head 27 includes a threaded portion 59 near the tip end 29, which threaded portion 59 is typically covered by a thread protector prior to retaining the torch tip.

As can be seen in FIG. 7, the torch head 27 includes a fuel passage 63 and a cutting oxygen passage 65.

The cut oxygen passageway 65 is described in U.S. Pat. No. 4,248,384.
Attach the torch tip to the tip end 2 as shown in
It ends in the middle of the torch head part that is fixed at 9. The fuel passage 66 terminates at an eccentric position with respect to the torch head portion and is perforated, as shown in FIG. 8, to form an annular mixing chamber for mixing fuel and oxygen. Concentric holes are provided. This passage cooperates with a torch tip secured to the tip end 29 to mix the fuel and oxygen. As is well known, a torch tip secured to the tip end 29 has a centrally disposed passageway for passing cutting oxygen and a plurality of concentrically arranged passageways for passing a mixture of fuel and oxygen. It has a passageway. Any commonly used torch tip may be used.

This is because U.S. Pat. As illustrated in U.S. Pat. This is because the cutting oxygen passage is isolated from the fuel and oxygen chamfers and passages by sealably abutting shoulders.The contents of both of the aforementioned patents are incorporated herein by reference. mentioned in.

Generally, the torch tip and torch head are made of copper alloy,
It is made from a corrosion-resistant metal such as stainless steel.

Each of the torch tubes 63 is constructed to have a substantially single-hole structure and can be sealed upstream of the torch head 27 to define sealed passages for passage of cutting oxygen, preheating oxygen, and fuel, respectively. Fixed. The torch tube can also be made from any material commonly used for metal tubes, such as bronze or stainless steel.

The main body 31 is usually made of a corrosion-resistant metal alloy such as a copper alloy, and is designed to withstand relatively rough handling by welders, field workers, and the like. ing. As shown, valves 48, 49 and 5
1 is provided in the main body 31.

Oxygen flow control valves and disconnection oxygen valves are both commonly used and are disclosed in U.S. Pat. No. 3,875.038 to Richard W. Miller, assigned to Victor Equinopnont. as disclosed in other patents such as .

As is well known, upstream fittings 55 and 57 are capable of sealing with hoses and hose connectors extending from high pressure regulators connected to pressurized containers of high pressure oxygen and high pressure fuel gases such as acetylene, respectively. It is connected to the.

The cutting oxygen flow control valve 48 may be any cutting oxygen flow control valve currently in common use. Cutting oxygen flow control valves have changed little over the years; a good performing cutting oxygen flow control valve 48 is that illustrated in U.S. Pat. No. 2,198,342. The illustrated disconnection oxygen flow control valve 48 has a bottom chamber 67, and when a lever 69 is pushed down at one pivot point 75, a resilient member 71 is released from the valve seat and pushed through the valve. The Boznoto Chano/Gu-67 is connected to the lever 69 so that oxygen flows.
is connected to. The lever 69 of the cutting oxygen flow control valve 48 is pivotably mounted so that it can be operated by the welder's thumb or hand, as shown. Lever 69 is a moat, US Patent No. 4.248
．． As illustrated in the No. 384 patent, it may be arranged to be operated by a finger or the like, as long as the valve throat operates within the valve to control the flow of oxygen.

It is often the case that the arrangement of the levers is changed within the same run (1') of the torch.

As mentioned above, previously known preheat tube assemblies include a diffuser section within the torch to provide mixing upstream of the torch head 27. but,
In the present invention, the fuel and mixed oxygen or preheated oxygen have separate passages so that no mixing occurs before reaching the torch head 27. More specifically, as shown in FIG. 8, fuel passage 41 communicates with passage 79 through passage 77 to mix fuel and oxygen. A preheated oxygen tube 46 with an internal passageway 45 communicates with a preheated oxygen passageway 81 within the torch head 47, as shown in FIG.

A mixer insert 83 is inserted into the preheated oxygen passageway 81 and the preheated oxygen passageway 81 has a retaining sealing means 85 which retains a sealing means 85 comprising a matingly formed shoulder and indentation. We are prepared. To be more specific,
Shoulder 87 of mixer insert 83 engages recess 89 to prevent preheated oxygen from flowing back into the fuel passage. As you can clearly see from the drawing, tube 43
holds the mixer insert 86 in place against the walls of the recess 89. Figure 4! llFigure 6 1
As shown in the figure, the mixer insert 86 has a central hole 91 whose inlet end communicates with the preheat oxygen passageway and whose outlet end comprises at least three small holes It ends at aisle 93. The small holes in the passageway 9 extend radially outwardly at an acute angle with respect to the longitudinal axis of the central hole 91, and are directed downwardly during use to ensure a thorough mixing of the fuel and preheated oxygen. extends to 7
F. A hole 593 terminates downstream of the sealing means and directs preheated oxygen into the annular slot 92 shown in FIG. S-R-S9
2, allowing the preheated oxygen and fuel to mix well. An annular space 92 has an annular area between the mixer insert 83 and the wall 94 of the torch head passage approximately equal to the total area of the passageway comprising the stoma. Preferably, the ratio of the area of the annular passage to the area of the passage consisting of small holes is in the range 04:1 to 2.1:it, in particular 1.1:i. Preferably, the passageway consists of at least six small holes. It has already been shown that a passage consisting of two small holes is insufficient to effect good mixing within a short distance within a 1.-chi head.

As shown, the middle hole 91 is a first hole 95 having a first diameter.
The heat dissipating spiral body 97 as shown in FIG. 6 is housed therein. The center hole 91 is still the first hole 95
The second hole 99 is substantially aligned with the first hole 99 and has a second diameter smaller than the first one-page diameter. Second hole 9? extends outwardly generally from the sealing means to a passageway 93 comprising a stoma.

As shown in FIG. 8, the passageway 79 for passing the fuel and oxygen mixture has a frusto-conical section terminating in a small diameter passageway 103 to attach the torch tip to the torch head 27. After ignition, the fuel and oxygen mixture is directed through the passageway 106 into the annular mixing region of the torch tip. If necessary, good results can be obtained by simply using the passageway 106.

In the illustrated example shown in FIGS. 3b to 6, the tip 105 of the insert 86 is conical with an apex angle of approximately 50°. The diameter of the passageway, which consists of four small holes spaced 90' apart, is approximately 0.89 m.
m (0,0351 nch ) and extends at an angle of approximately 65° with respect to the central long axis shown in FIG. The area of the annular groove R-s between the tip 105 and the wall 94 shown in FIGS. 1 and i3b is 1.4
8 key 2 (0,00231n2) to 6.26 JCO,
DO971n2).

The mixer insert 86 has a reduced diameter section 111 to hold the copper D4 wire in place.

If desired, the tip 105 may be formed into a frusto-conical shape without adversely affecting performance or mixing of fuel and preheated oxygen.

The above-described components shown in the accompanying drawings are preferably made from corrosion-resistant materials, such as copper alloys, to resist corrosion and provide good thermal conductivity.

To explain the use of the torch 11, the torch 11 is assembled as shown in the diagram according to the above-mentioned procedure, and then
Oxygen and fuel inlet passages 55 and 57 are connected with appropriate hoses communicating with oxygen and fuel sources and are fitted with valves. A torch tip inserted into the torch tip end 29 provides the required heating frame. By adjusting the fuel flow control valve, a heated flame is obtained. When the workpiece is heated until the metal melts, the lever 69 is pushed down to open the cutting oxygen flow rate control valve and begin cutting. By further supplying oxygen for cutting, the metal material is roughly melted, and the molten metal flows out from the cut section. In this way, the necessary work is completed. The cutting oxygen flow control valve is closed. The oxygen and flow control valves are then closed until it is necessary to use the torch again. A manually operated cutting torch, which is the general form of the invention described herein, is disclosed in U.S. Pat. A cutting torch attachment that can access the valve may be used. Large scale heating tips may be used for large scale cutting operations, sometimes performed using cutting and torch assemblies. Advantageously, automated mechanical torches are employed for carrying out the invention.

An advantage of the present invention is that the vertically formed mixer-like insert in conjunction with the special design of the passageway through which the fuel and oxygen mixture flows is more economical than conventional drilled torch heads; Despite being able to exhibit all the advantages of a head mixer torch with very little fire hazard, it eliminates the disadvantages associated with traditional torches, and uses a large amount of fuel. The aim is to provide an economical 1-chi that can be used.

It can thus be seen that the present invention has achieved the objectives originally stated.

Although the invention has been described in terms of particular forms, what has been disclosed herein is intended to be illustrative only, and details of construction and use may be made without departing from the spirit and scope of the invention. Please understand that it is okay to make various changes in the combination and arrangement of parts.

[Brief explanation of the drawing]

FIG. 1 is an inverted, partially cutaway view of a cutting torch constructed in accordance with one embodiment of the present invention. 2 is an inverted, partially cutaway view of a one-piece head mixer constructed in accordance with the embodiment shown in FIG. 1; FIG. Figure 3a is an inverted view with the area of the annular space around the mixer insert cut away and viewed in an enlarged view, and Figure 6b shows the mixer shown in Figure 3a and the annular space around the mixer. FIG. FIG. 4 is an end view of the mixer insert. FIG. 5 is an axial cross-sectional view of the mixer inosert shown in FIG. 4; FIG. 6 is an axial cross-sectional view of the mixer insert shown in FIG. 4 with a heat dissipation screw inserted into the first central hole and a reduced diameter section attached; FIG. 7 is an end view of the torch head shown in FIG. 1, viewed from the tube end side, with a partial cutaway showing the arrangement of the passageway that guides the fuel and oxygen mixture to the tip; It is illustrated. FIG. 8 is a partial sectional view of the torch taken along the line VM--■ in FIG. 7. 11... Cutting torch, 627... Torch head,
29. Chip end, 31.. Main body, 33.. Connection tube, 34.. Case, 35.. Oxygen tube, 4.
8...Oxygen valve for cutting, 49...Preheating nitrogen pulp,
51...Fuel valve, 67...Bottle/bar, 69...Lever"-, 75...Pivot point, 83...Mixer insert, 85...Engaging sealing means , 87・
・・Shoulder, 89・Dent, 91・Center hole, 92・
・Annular space is −S, 93・°・Passway consisting of small holes, 95
... first hole, 96 ... heat dissipation spiral body, 99 ... second hole, 111 ... diameter reduction part. Patent Application Agent, Patent Attorney, Yuki Yamazaki, Sote, Shinsei, Yu1j, Tadashi (Method), 1985 7
Commissioner of the Japan Patent Office on March 3, 1985 (1985) Title of the invention 1 to 52163 with a head mixer 3 Relationship with the person making the amendment Name of the applicant who held the title Title: Victor Equipment Company 4 Agent

Claims (6)

[Claims] (1) A cutting oxygen valve and passage, a preheating oxygen valve and passage, a fuel gas tube and passage, a tip end for fixing the tip, and a head passage for passing cutting oxygen and a fuel An improved torch apparatus comprising a head having a head passage for passing a mixture of gases therethrough, the apparatus further comprising an integral head mixer having a fuel passage and a preheated oxygen passage in the head; a mixer inosert with an engaging seal disposed in the mixer insert for inhibiting flow of preheated oxygen through the mixer insert, the mixer insert having a central hole; The inlet end of the central hole communicates with the preheating oxygen passageway, and the outlet end thereof communicates with a passageway consisting of at least three small holes, the small holes forming an acute angle with respect to the longitudinal axis of the central hole and having a radius. extending outwardly in a direction, and the passageway formed by the aperture terminating downstream of the sealing means;
The flow of preheated oxygen gas is directed into an annular space defined by the discharge end of the insert and the preheated oxygen passage, and a connecting line between the fuel passage and the preheated oxygen passage is configured to a head passage through which the mixture passes, which is in communication with an annular passage through which the fuel and oxygen are mixed, and which serves to intimately mix the fuel and oxygen; The area of the annular groove formed between the ring and the wall surface is approximately equal to the total area of the passage made up of small holes, so that the preheated oxygen is mixed well with the fuel in a short time within the head. A torch device characterized in that it is capable of preventing dangerous and damaging backfire. (2) The first and second inserts are arranged in a substantially straight line.
a central hole, the first hole being sized to a first diameter and containing a heat dissipating screw;
a hole sized to a second diameter smaller than the diameter of the first hole and extending generally outwardly from the sealing means at a passageway comprising the aperture. A torch device according to claim 1. (3) A torch according to claim 1, characterized in that the sealing device consists of a retainable shoulder and a recess formed in the insert and in the preheating oxygen passage. Device. (4) A torch device according to claim 1, characterized in that a passageway consisting of at least four small holes is provided to allow the fuel to be thoroughly mixed. (5) The ratio of the area of the annular space around the discharge end of the passage rounded by the small hole to the total area of the passage consisting of the small hole is in the range from 04=1 to J2.1:11. A torch device according to claim 1. (6) The torch device of claim 5, wherein said ratio is approximately 1.1:1.