JPH0539293Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a high-pressure, high-speed cutting nozzle suitable for gas cutting of thick steel plates, for example, about 100 to 500 mm.

[Conventional technology]

The present inventors had previously proposed a high-pressure, high-speed cutting crater as shown in Figures 5 to 7 (Jetko Kosho 62).
−42257).

This cutting crater consists of three blocks, namely:
It consists of a cover 10 at the tip of the crater, a crater body 11 that is a communication part with a blowpipe (not shown), and a sleeve 12 that forms a divergent-type cutting oxygen nozzle. A sleeve 12 is placed inside this crater body 11.
It is constructed by incorporating.

This cutting port includes a first oxygen flow path 13 and a fuel gas flow path 14 arranged annularly around the central sleeve 12.
and a second oxygen flow path 15 are formed, and the tip of the cover 10 has a small circular inner heating flame recess 16a and an outer heating flame recess 16b arranged concentrically (see FIG. 6), or Annular groove 1 for annular internal heating flame
7a and annular groove 17b for external heating flame (see Figure 7)
is formed. The fuel gas flow path 14 is branched into an inner fuel gas flow path 14a and an outer fuel gas flow path 14b, and opens into the recesses 16a, 16b or the annular grooves 17a, 17b, where the first oxygen flow path is formed. 13 or the second oxygen flow path 15.

With this configuration, a high-pressure cutting oxygen stream It is formed. The heating flame groups A and B include inner and outer fuel gas flow paths 14a,
Fuel gas and oxygen flow path 13,1 injected from 14b
5 and the heating oxygen ejected from the recesses 16a, 16.
b or by forcibly mixing and burning in the annular grooves 17a and 17b.

As a result, due to the synergistic effect between the heating flame groups A and B, especially the heating flame group A is extended and held, thereby reducing the jet effect of the cutting oxygen jet flow ejected from the central divergent-shaped cutting oxygen hole. This allows for highly efficient cutting.

In order to form the above-mentioned oxygen flow path and fuel gas flow path, a plurality of oxygen holes and fuel gas holes are bored in the cover and the crater body, and when both are screwed together, We are trying to communicate with each other.

The outer surface of the upper end of the crater body is a tapered surface, and a circumferential groove for supplying fuel gas or oxygen is formed.By installing the crater body in a cover and screwing the blowpipe into the cover, the circumferential groove and the blowpipe are connected. A source of fuel gas or oxygen is adapted to be communicated.

[The problem that the idea aims to solve]

The inventors then put the above product into practical use,
After various studies, the following points for improvement were found.

(1) Since the cover and the crater body are fixed with screws, if these screws are not precisely concentric with the central axis, the joint surfaces of the cover and the crater body will not come into close contact, and oxygen and fuel gas will leak inside. There is a high risk of backfire, etc. due to mixing. Therefore, in order to avoid this, it takes time and effort to process the threads and finish the joint surfaces.

(2) It is necessary to drill a large number of oxygen and fuel gas flow paths in the cover that forms the tip of the crater, or to process complex shapes such as fuel gas grooves, which requires time and cost to process. It takes.

(3) The cover and the crater body are screwed together to form a fixed structure with no gaps, and when the blowpipe and cover are screwed together and fixed, the taper surface and the inner surface of the blowpipe do not match sufficiently. There is a risk that oxygen and fuel gas will mix and cause a flashback.

(4) In general, when cutting work requires intense ignition and extinguishing, the heating flame is not extinguished, the amount of heating oxygen and fuel gas is reduced, leaving a small pilot heating flame, and the flow rate is increased during actual work. I try to make it a large heated flame.

However, in this case, soot adheres to the annular recess of the cutting nozzle due to incomplete combustion of the heating flame, deteriorating the shape of the heating flame, so it is necessary to frequently clean the cutting nozzle.

The present invention takes these things into consideration and is easy to manufacture.
The purpose is to provide a cutting tip with better performance and higher safety.

[Means to solve the problem]

In order to solve the above problem, the invention of the first claim provides a crater body and a cutting oxygen nozzle fitted in the center of the crater body, and the cutting oxygen nozzle is centered on the opening surface of the crater body. A high-pressure, high-speed cutting crater in which an oxygen injection port and a fuel gas injection port are formed concentrically and alternately in the radial direction, and a heated flame surrounding the cutting oxygen flow is formed from the oxygen injection port and the fuel gas injection port. In the above, the crater main body is composed of a base in which oxygen and fuel gas supply paths are formed, and a plurality of concentric cylindrical bodies screwed and attached to the distal end surface of the base, and the base end of the base A tapered blowpipe connection part is formed on the side to connect with the blowpipe for supplying oxygen and fuel gas, and the tip side of the crater main body has a male threaded part on the outer peripheral surface to be screwed into the blowpipe. , and a cylindrical cover forming an oxygen passage is loosely fitted between the inner circumferential surface of the inner circumferential surface and the outer circumferential surface of the blowpipe, and by threading the cover and the blowpipe, the blowpipe can be connected to the blowpipe. The blowpipe connection part is attached to the locking surface with the mouthpiece main body in close contact with the latter.

Further, the invention of the second claim is such that at least one cylindrical body of the crater body is provided with a branch hole for merging the oxygen supply path and the fuel gas supply path at the opening surface.

[Operation] In such a high-pressure, high-speed cutting nozzle, the oxygen and fuel gas injected from the oxygen injection port and the fuel gas injection port cause an annular heated flame to surround the cutting oxygen flow around the central cutting oxygen nozzle. In particular, the outer heated flame cylindrically covers and heats the inner heated flame, increasing the burning rate of this inner heated flame and also raising the temperature of the flame and increasing its length. This preserves the kinetic energy of the cutting oxygen flow and enhances the jet effect.

Since the base and the cylindrical body are screwed together and the oxygen supply passage and the fuel gas supply passage are formed between the opposing surfaces of the cylindrical bodies, the oxygen supply passage and the fuel gas supply passage are separated by the threaded surface. This prevents them from mixing and causing backfire.

The oxygen and fuel gas supply passages leading to these injection ports are formed on the opposing surfaces of the cylindrical bodies attached concentrically to the base, so they are processed by forming grooves or protrusions on the inner or outer surface of the cylindrical bodies. By forming this, it is sufficient to form an appropriate space, and processing is easy.

By loosely fitting the crater body into the cylindrical cover with some clearance, and screwing the cover and blowpipe together, the contact between the tapered surfaces of the crater body and the blowpipe causes the crater body to align with the axis. A force in the orthogonal direction acts, and the locking surface in the direction of the crater and the base end surface of the cover shift and center naturally, and the blowpipe and the crater body are brought into close contact, resulting in a mixture of oxygen and fuel gas. prevent.

Furthermore, in the cylindrical body inside the crater main body at the crater,
By drilling branch holes that branch from the oxygen supply path so that their openings alternate with the fuel gas supply path in the circumferential direction, the amount of oxygen supplied to the heated flame during the combustion reaction is increased, and the heating flame Incomplete combustion of fuel is prevented.

Note that a small circular hole may be formed in the cylindrical body by a groove and a protrusion, or a square hole may be formed by forming a groove on one side. Compared to a small hole with a circular cross section, a square hole has a slower flow velocity at the corner, and there are fewer problems with blowout (flame blowing away) even in the case of LP gas, where the combustion speed is slower than acetylene gas.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present application, and this high-pressure, high-speed cutting nozzle includes a nozzle main body 1,
It consists of a cutting oxygen nozzle (sleeve) 2 fitted in the center of the crater body 1.
It is composed of a base 3, a cylindrical cover 4, and two cylindrical bodies 5 and 6 that are screwed and attached to the base 3.

The cover 4 has a nut-shaped outer circumferential surface 4a on the distal end (hereinafter, the lower side is referred to as the distal end and the upper side as the proximal end in FIG. 1), and the outer circumferential surface of the proximal end has a male thread 4b for attaching a blowpipe screw. is formed. Further, the inner surface of the tip of the cover 4 has a tapered portion 4c such that the diameter becomes smaller toward the tip.

The base portion 3 has a tapered portion 3 with a smaller diameter on the base end side.
The sleeve 2 is loosely fitted along the axis of the truncated cone, and an annular first oxygen supply path 7 is formed between the outer surface of the sleeve 2 and the outer surface of the sleeve 2.
A sleeve loose fitting hole 3b is formed. The upper end of the base 3 has a recess 3c into which the flange 2a formed at the upper end of the sleeve 2 is inserted.
A female thread 3d is formed on the inner surface of the recess 3c, and a ring-shaped fixing nut 3e is screwed onto this female thread 3d to press the flange 2a from above and fix the sleeve 2.

The outer peripheral side of the lower end surface of the base 3 is a locking surface F that contacts the base end surface of the cover 4, and a locking convex portion 3f that projects in a cylindrical shape is formed on the center side of the base end surface.
The inner surface of this locking protrusion 3f has a female thread 3g that engages with the male thread 5a at the upper end of the first cylindrical body 5, and the outer surface has a male thread 3g that engages with the female thread 6a at the upper end of the second cylindrical body 6. 3h are formed respectively. The tapered portion 3a of the base portion 3 has three circumferential grooves 3 extending in the circumferential direction.
i, 3j, and 3k are formed, the first circumferential groove 3i has a communication hole 3l that communicates with the sleeve loose fitting hole 3, and the second circumferential groove 3j has a communication hole 3l that extends in the axial direction and is annular around the axis. A plurality of arranged fuel gas supply passages 8
The fuel gas holes 3m forming the third circumferential groove 3 are opened, and the third circumferential groove 3 is opened.
Oxygen holes 3n, which constitute a plurality of second oxygen supply passages 9 extending in the axial direction and arranged annularly around the axis, are opened in k. Note that the fuel gas hole 3
m is open at the distal end surface of the locking convex portion 3f.

The first cylindrical body 5 is screwed to the locking projection 3f at its base end, and a sleeve loose fitting hole 5b having the same diameter as the base 3 is formed along the axis. The inner tip side of the hole is fitted with a plurality of protrusions 5c of the sleeve 2 parallel to the axis.
This positions the sleeve 2 and also forms a first oxygen hole 5d between the grooves between the adjacent ridges 5c and the inner surface of the sleeve 2.

Further, the first cylindrical body 5 is diagonally bored to connect the inner circumferential surface (first oxygen supply path 7) of the first cylindrical body 5 and the distal end surface of the first cylindrical body 5. Oxygen branch holes (branch holes) 5k are formed. First cylindrical body 5
A plurality of short protrusions 5e are provided on the outer surface of the
However, a protrusion 5h is further formed on the tip side, and a second fuel gas hole 5i is formed between the groove of the protrusion 5h and the inner surface of the second cylindrical body 6. Further, reference numeral 5j denotes a first fuel gas hole which is diagonally bored through the first cylindrical body 5 and communicates the outer surface of the first cylindrical body 5 with the distal end surface of the first cylindrical body 5. This first fuel gas hole 5j
is opened between the opening of the oxygen branch hole 5k on the tip surface, and as a result, the oxygen branch hole 5k and the first
The fuel gas holes 5j are arranged alternately in the circumferential direction on the tip surface.

Further, the distal end surface of the first cylindrical body 5 is retreated from the distal end surface of the cover 4 in the proximal direction to form a recessed portion 5l.

The second cylindrical body 6 is screwed into the locking protrusion 3f at the base end, and communicates with the fuel gas hole 3m of the base 3 between the surfaces facing the first cylindrical body 5 on the inside. It forms a part of a fuel gas supply path 8, and this fuel gas supply path 8 is opened to the tip surface of the crater via the second fuel gas hole 5i and the first fuel gas hole 5j. The short protrusions 5e are for dividing the fuel gas supply path 8 into upper and lower chambers communicating with each other through a groove to suppress pulsations in the pressure of the fuel gas.

The outer surface of the second cylindrical body 6 has a tapered portion 6b on the tip side corresponding to the tapered portion 4c of the cover 4, and has a plurality of protrusions 6 at the center of the outer surface in the axial direction.
c is formed to have a slight gap with the inner surface of the cover 4. The second cylindrical body 6 is formed shorter than the cover 4, and its distal end surface is located on the same plane as the distal end surface of the first cylindrical body 5. With the above configuration, the space between the outer surface of the second cylindrical body 6 and the inner surface of the cover 4 communicates with the second oxygen hole 3n of the base 3 and constitutes a part of the second oxygen supply path 9. This second
Like the fuel gas supply path, the oxygen supply path 9 is divided into upper and lower chambers communicated by the groove of the protrusion 6c.

To assemble the high-pressure, high-speed cutting nozzle configured as described above, the sleeve 2 is inserted into the sleeve loose fitting hole 3b of the base 3, and the sleeve 2 is fixed by screwing the fixing nut 3e into the recess 3c. Furthermore, the first cylindrical body 5 and the second cylindrical body 6 are screwed and fixed to the locking convex portion 3f of the base 3, and the combined body is inserted into the cover 4, and the external thread 4b on the outer surface of the cover 4 is inserted. It is screwed onto a blowpipe (not shown). As a result, the tapered surface of the inner surface of the blowpipe comes into contact with the tapered part 3a of the base 3, the fuel gas supply path of the blowpipe is connected to the second circumferential groove 3j of the base 3, and the oxygen supply path is connected to the cut oxygen hole 2b of the sleeve 2 and the base 3. Oxygen and fuel gas are supplied to the high-pressure, high-speed cutting nozzle through communication with the first circumferential groove 3i and the third circumferential groove 3k, respectively.

When the cutting nozzle and the blowpipe are connected in this way and the valve of the blowpipe is opened, the oxygen supplied from the first circumferential groove 3i passes through the first oxygen supply path 7, with some of the oxygen flowing through the oxygen branch hole 5k and the rest flowing through the oxygen branch hole 5k. The oxygen is injected into the recesses 5l from the first oxygen holes 5d.

On the other hand, the fuel gas supplied from the second circumferential groove 3j passes through the fuel gas hole 3m and the fuel gas supply path 8, and part of it is from the first fuel gas hole 5j and the rest is from the second fuel gas hole 3m.
The fuel is injected from the fuel gas holes 5i into the recesses 5l. As a result, the fuel gas and oxygen are forcibly mixed in the recess 5l to form a heating flame group A and a heating flame group B.

These heating flame groups heat the material to be cut, and at the same time are injected from the cutting oxygen hole 2b to cover the cutting oxygen flow, so that the heating flames have a synergistic effect with each other, and in particular, the inner heating flame A is elongated. death,
The above-mentioned protection effect of the cutting oxygen flow and heating effect of the material to be cut are enhanced.

In the high-pressure, high-speed cutting crater described above, the fuel gas supply path 8 is connected to the oxygen supply paths 7 and 9 by means of a threaded surface.
Since the cutting nozzle is airtightly partitioned, the fuel gas and oxygen will not mix inside the cutting nozzle, regardless of the dimensional accuracy of the parts. Also, there is a gap S between the outer surface of the protrusion 6c of the second cylindrical body 6 and the inner surface of the cover 4, and when the male screw 4b of the cover 4 is screwed and fixed to the blowpipe, the inner surface of the blowpipe 1
The taper part 3a contacts the blowpipe, the mouthpiece body 1 is centered with respect to the blowpipe, and the taper part 3a and the inner surface of the blowpipe come into close contact. Therefore, dangerous situations such as backfires are prevented, and there is no need for strict dimensional accuracy in manufacturing the members, which saves time and effort in manufacturing and reduces costs.

Furthermore, the oxygen branch hole 5k and the first fuel gas hole 5j
are arranged alternately in the circumferential direction on the tip surface of the first cylindrical body 5, so that an increased amount of oxygen is injected from the vicinity of the heating flame, increasing the amount of oxygen supplied to the heating flame. As a result, in the cutting nozzle of this embodiment, incomplete combustion of the pilot heating flame and the like and generation of soot due to the incomplete combustion of the pilot heating flame etc. can be prevented. Further, since sufficient oxygen is supplied to the heating flame group A and also affects the heating flame group B, the heating flame is strengthened, so there is also the effect that the cutting ability is improved.

The flow path for oxygen and fuel gas at the tip of the cutting crater has a close-packed and complicated design to increase injection energy and improve efficiency. It is sufficient to form grooves or protrusions on the inner or outer surface of the
This process involves cutting and grooving, which is much easier than conventional drilling, and also allows for smoother surfaces and more precise machining.

3 and 4 show a second embodiment, in which a second oxygen hole 6 is obliquely formed at the tip of the second cylindrical body 6.
e to direct the oxygen flow inward, thereby increasing the combustion efficiency of the fuel gas and improving the heating effect.

In the above embodiment, a branch flow path is provided in the oxygen supply path, thereby obtaining a unique effect.
Since the crater main body 1 is composed of the base 3, the first cylindrical body 5, and the second cylindrical body 6, it is only necessary to perforate each individual part, which makes the work easy and allows for fine workmanship. can.

In the above embodiment, the cutting oxygen supply hole 2b is of a divergent type, but it is of course possible to apply the cutting oxygen supply hole 2b to a straight type.

[Effect of idea]

As detailed above, the present invention has the following effects.

The device of the first claim forms a tapered blowpipe connection part on the proximal end side of the crater body, and has a male thread on the tip side of the crater body that loosely fits the crater body inside and screws the blowpipe on the outer surface. By attaching a cylindrical cover having a cylindrical shape and forming a locking surface that locks the base end surface of the cover on the crater body, the contact between the tapered surfaces of the blowpipe and the crater body causes the core of the crater body and the blowpipe to The vent body, blowpipe, and cover are integrated by screwing together the cover and the blowpipe. Therefore, the contact surfaces of the blowpipe and the mouthpiece body are in close contact with each other, making it possible to construct a highly safe firepit that does not cause backfire.

Further, since the main parts are divided, the work for forming the oxygen and fuel gas supply passages can be done more easily.

In addition, in the invention of the second claim, sufficient oxygen is supplied to the heating flame, so the generation of soot in the heating flame is prevented, and the heating flame is strengthened.
The effect of improving cutting ability can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the first embodiment of this invention.
Fig. 2 is a plan view thereof, Fig. 3 is a side sectional view of the second embodiment, Fig. 4 is a plan view thereof, Fig. 5 is a side sectional view of the conventional example, Fig. 6 is a plan view thereof, and Fig. 7 The figure is a plan view of another conventional example. 1... Crater body, 2... Cutting oxygen nozzle, 3...
... base, 5 ... first cylindrical body, 6 ... second cylindrical body,
7...First oxygen supply path, 8...Fuel gas supply path,
9...Second oxygen supply path.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A crater body and a cutting oxygen nozzle fitted in the center of the crater body, and an oxygen injection port centered on the cutting oxygen nozzle on the opening surface of the crater body. and fuel gas injection ports are formed concentrically and alternately in the radial direction, and the oxygen and fuel gas from the oxygen injection ports and the fuel gas injection ports form a heated flame containing a cutting oxygen flow. In the cutting crater, the crater body is composed of a base in which oxygen and fuel gas supply paths are formed, and a plurality of concentric cylindrical bodies screwed and attached to the tip surface of the base, A tapered blowpipe connection part is formed on the base end side to connect with the blowpipe for supplying oxygen and fuel gas, and a male screw part is formed on the outer peripheral surface of the tip side of the crater body to be screwed into the blowpipe. and a cylindrical cover that forms an oxygen passage between the inner circumferential surface and the outer circumferential surface of the crater body is loosely fitted, and by screwing this cover and the blowpipe, the crater body A high-pressure, high-speed cutting nozzle characterized in that the blowpipe connecting portion is attached to a locking surface of the blowpipe with the nozzle main body in close contact with the nozzle body. (2) At least one cylindrical body inside the crater body has a branch hole branching from the oxygen supply path,
2. The high-pressure, high-speed cutting nozzle according to claim 1, wherein the openings are formed so as to alternate with the fuel gas supply passage in the circumferential direction.