JPH0121402B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a backfire prevention type gas blowpipe structure, and particularly to a blowpipe used for coating a base with a metal coating material. The present invention finds application in gas blowpipe configurations other than flame deposition of metal coatings. For example, the present invention can be used to weld, surface melt, cut, flame, and flame deposit non-metals.
However, the examples given here also have the ability to deposit metal coatings. The currently used term "backfire prevention" means that the blowpipe 2 avoids explosion of the gas mixture within the appliance.

Anti-backfire appliances have recently become known.
Particularly used in the flame spraying of powders, flashback protection was protected by special nozzle configurations.

In conventional devices of this type, the nozzle is supplied with a combustible gas which is already mixed and is therefore ignitable and also explosive at a position upstream of the nozzle. In modern constructions, the mixing of the gases no longer takes place at a suitable point in the device, but rather within the nozzle itself, with the mixing occurring substantially immediately before exiting the nozzle.

"Internal mixing" nozzles are known per se from cutting blowpipes, and this type has less flashback protection requirements than equipment used for metal coating production. Internal mixing cutting blowpipe nozzles are a different approach to this solution, but this approach is not completely satisfactory.

Although highly desirable, provision to prevent flashbacks in ordinary blowpipe systems is not possible with internal gas mixing nozzles, and special nozzles of unique design are required for use as special nozzles. must be carried out using appropriate equipment. What is noteworthy here is that, in contrast to a blowpipe that performs simple welding or cutting, a device that has the ability to spray powder with a flame has the ability to They present special problems such as balancing the mixing and dispensing of the powder with the carrying gas and the problem of sealing between metal interlocking surfaces. These problems are exacerbated by the fact that the end of each component gas supply line within the blowpipe body generally does not mate closely with the corresponding coupling opening of the internal gas mixing nozzle. For example, the nozzle is connected to the blowpipe body (which is roughly shaped like a gun or pistol).
The combination is not possible because the correlation of the combination is not suitable or it is not symmetrical.

Even in devices that have recently come into use,
This coupling problem has not been solved in an optimal manner. In this case, a fixed, immovable block is incorporated into the system, with small individual flow tubes in this part for channeling the gas component to the surface that mates with the nozzle. To ensure proper operation of the device, the nozzle must be firmly and tightly clamped against the metal bonding surface of the block. This tightening operation usually requires the use of a vise or similar tool, and therefore poses a particular disadvantage for coating operations, since nozzle changes are frequent. When replacing the nozzle, special care must be taken that a vise or similar tool is required to unthread the nozzle fastening parts.

Apart from this fact, tightening the entire system requires a complex operation and has the potential to damage not only the housing on its external side, but also the metal sealing surfaces. There is also gender. For example, repeated nozzle assembly and disassembly may inadvertently leave small amounts of powder molecules behind. Moreover, the multiple passages required in current mixing nozzle systems present unusual sealing problems at all joints and necessitate the use of soft annular sealing components that are subject to thermal loading. Moreover, since the heat generated in the nozzle is dissipated only through the main body of the blowpipe, the joint surface of the powder storage container is overheated.

One of the objects of the present invention is to provide an improved gas blowpipe structure having multiple types of nozzles for internal gas mixing.

Another object is to avoid the problems caused by conventional structures and to obtain a flash-back-proof gas blowpipe.

Still another object is to provide a blowpipe which allows the nozzle to be removed or replaced without fixing the blowpipe body.

Another object of the present invention is to provide a blowpipe whose nozzle can be easily replaced by simply holding it by hand. Use of a stop ring also includes using it only at a location relatively remote from the nozzle.

Another object is to provide a method for removably coupling an internal gas mixing nozzle to a blowpipe body. In this case, the upstream connecting ends of the passages in the nozzle may or may not align with the downstream connecting ends of the various supply passages of the blowpipe.

The foregoing objects and other features of the invention include a special intermediate adapter having an upstream end with an exchangeable connection to the blowpipe body and a downstream end with an exchangeable connection to the gas mixing nozzle; It consists in wearing the. The individual flow of the combustible gas components is maintained through the intermediate adapter, and this individuality is also maintained during the nozzle connection, for which no special oblique positioning is required. Although elastomeric (rubber) seals are not used in the nozzle connection, they can be safely used in the connection of the adapter body to the torch body.

The present invention makes it possible to easily and safely attach and detach a new nozzle by handling the gas mixing nozzle and the adapter unit that does not perform gas mixing as separate small assemblies. The removable connection point to the gas mixing nozzle is located at a safe "thermal distance" from the gas mixing nozzle. That is, away from the source of heat in the appliance. The nozzle and its adapter can be replaced by simply rotating a threaded connecting collar by hand, and the adapter can be connected to the blowpipe body by inserting and assembling. By keeping a stock of new gas mixing nozzles to which the individual adapter according to the invention is preassembled, replacement of the new nozzle can be completed and the interruption time of blowpipe work can be reliably minimized.

Nozzles that perform internal gas mixing can only provide a very small volume to complete the mixing, and since this is essentially the discharge part of the nozzle, there is little to no heat generation in the equipment. This is the smallest part, and in the pre-assembled nozzle and adapter presented here, this source of heat is necessarily located further away from the point of removable connection to the blowpipe body. In particular, since no gas mixing can occur within the adapter body, there is no potential source of heat generation within the adapter body. The concept of an adapter unit that does not perform gas mixing can be used not only in the linear arrangement described here, but also in bent or extended nozzle arrangements. . In the latter case, the discharge pipe axis of the gas mixing nozzle is either skewed in the longitudinal direction of the gas supplied through the adapter body at an angle, or is extended from the blowpipe body and skewed in the longitudinal direction. Thus, the removable connection point to the blowpipe body has a larger “thermal distance”.
will be held.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 depicts the entire head of a system for spraying powder by flame as an embodiment of the present invention, and it can be understood that only the nozzle connecting portion of the blowpipe body 3 is necessary for illustration. Therefore, the blowpipe body 3 may be understood to have a conventional shape, for example in the shape of a gun, with a pistol grip (not shown). The blowpipe body 3 is provided with separate and separate devices for supplying a flow of powder with conveying gas, for supplying a flow of fuel gas (e.g. acetylene) and for supplying a flow of oxygen. As can be seen, all of these have their individual downstream outflows opening into the circular coupling surface in the plane of FIG. 1. As shown in the figure,
The central passage 6' supplies the flow of powder together with the carrier gas, the first radially offset passage 4 accommodates the flow of fuel gas, and the second radially offset passage 4' (offset at an angle to passage 4) is used for oxygen. According to the invention, these flows are kept separate and have separate passages via an intermediate adapter part 5 to the nozzle 1 with internal gas mixing.

As shown, the adapter member 5 is generally cylindrical and elongated. It is characterized by having a short radial flange 10'' for connection with the blowpipe body 3 when the tightening sleeve or fitting 10 is threadedly connected to the blowpipe body 3.A key pin 3 in the body 3 ' protrudes from the body 3 for angular positioning of the adapter 5, and connects passages 6'-4-4' and 6-8''- in the blowpipe body.
8 ensures a defined alignment of the husband and wife at the upstream end face 2 of the adapter 5. The powder flow passage 6'-6 communicates with a similar central passage 6'' in the nozzle 1, thus connecting the connected member 3-
5-1 to form a first through passage, and at this time the discharge part is aligned with the discharge part axis of the nozzle.

For the purpose of having separate inlets in the gas mixing nozzle 1 to create an immiscible flow of fuel gas and oxygen, the downstream coupling end face 7 of the adapter 5 and the mating adjacent upstream end face of the nozzle 1 each have separate radial inlets. It has a shape that acts to form a longitudinally separated annular manifold. As shown in the figure, this shape is also present in the adapter 5, and the radially outward grooves 25 are manifolds for the fuel gas.
The radially inner groove 25' is a manifold for oxygen. These grooves 25-25' in conjunction with the planar upstream end face of the nozzle 1 form a complete manifold, and the first distributed multiplicity of nozzle inlet passages 17 form the grooves 25 of the fuel gas manifold. The second distributed multi-nozzle inlet passage 15 is open only towards the groove 25' of the oxygen manifold. These nozzle inlet passageways 15-17 are shown with chamfered upstream ends 9-9'.
The groove 25 of the fuel gas manifold is the groove 25 of the fuel gas manifold.
into one or more extension passages 8 within a radius of
As can be seen in the Figures and FIG. This is ensured by a closing sleeve 24 with a stopper.In a similar manner, the second dispensing slot 11'
One or more oxygen passages 8', which communicate with manifold grooves 25', are connected to slots 11', as seen in FIGS. 1 and 5.
is connected only to the oxygen inlet hole 8''; its exclusivity lies in the "O" located outside the axis of the slot 11'.
The slot 11' is sealed by the same sleeve 24 passing through the ring seal.

Parallel passages 8, 8' occupying a large number of positions here.
Although it is stated that the groove portions 25, 25' and the slots 11, 11' are continuous, this is not absolutely necessary. The reason for this is that in both cases a single passage 8
Alternatively, a single passage 8' may be sufficient. In any case, the manifold groove 25-
25' assists in uniformly distributing each individual stream of gas and is only mixed in the nozzle 1 section.

In the structure described above, the intermediate adapter member 5
is considered to have the following five functions.

...The gas components to be supplied to the nozzle can be continuously separated and supplied separately.

...The discharge passage 4-4' in the blowpipe body is angularly offset, and the manifold groove 25
- 25', redirecting the discharge passages of the gas components in the form of separate discharge passages located concentrically in the radial direction.

...For fuel gas, a number of angularly positioned discharge passages 8 communicate with the manifold 25, and for oxygen, a number of angularly positioned discharge passages 8' communicate with the manifold 25'. By allowing the gas components to communicate, it is possible to uniformly distribute each gas component and improve the discharge condition around the surrounding area.

...The pre-assembly helps the installation function of the nozzle 1, thereby making the nozzle replacement work procedure extremely easy by replacing the pre-assembled product of the nozzle 1 plus adapter 5. In particular, it should not require the use of spanners or vises when changing the nozzle during special tasks, and... it should have a heat-insulating function, i.e., virtually separate the blowpipe body from the heat source. By increasing the distance between It has a part that allows it to emanate.

The internal gas mixing nozzle 1 shown in FIG.
-18 are installed adjacent to each other in the axial direction. The central one 13 of these members has a central hole that forms the nozzle portion 6'' in the powder flow path.
This central member 13 also has oxygen supply passages 8' having a number of angular positions;
5 and the passage 8' is not required since the groove 25' functions as a manifold around the circumference of the groove 25'. Near the downstream end of the central member 13, the radially outward grooves 20 are radially different and therefore intersect the alignment axis of the oxygen supply passage 15, and downstream of the grooves 20, this same alignment is Separate and corresponding gas mixing passages located at a number of angles surround the discharge of the powder and its carrier gas leaving the passage 6'' and also supply and maintain the flame pattern from the nozzle. As shown in the figure, the oxygen supply passage 15 is
5', and emit separate jets of oxygen beyond the grooves 20, each being discharged towards the center of the corresponding gas mixing passage 21.

The downstream end face 22 of the central member 13 is preferably tapered to be slightly conical;
This is press-fitted and therefore in an effective sealed assembly with the bore of the outer sleeve member 14, but in the axial direction between the groove 20 and the flange 16 on the outer side of the central member 13. The cylindrical surface becomes a continuous annular gap or manifold 19 on the circumference, which serves as a fuel gas passage to be supplied to the groove portion 20 . The upstream end surface of the hole in the sleeve member 14 is chamfered, and covers and overlaps the fuel gas supply passage 17 in the flange 16 of the center member 13 in the radial direction, and also overlaps the annular manifold groove 25 in the radial direction. . Actuation of the oxygen jet discharged from the restricting orifice 15 over the groove 20 into the separate mixing passage 21 draws fuel gas out of the manifold groove and into the mixing passage 21. Of course,
Since mixing begins when oxygen enters the groove 20, the groove 20 is sometimes a mixing manifold, although substantially all of the mixing occurs in separate discrete volumes of the passageway 21. Sometimes it is understood that there is. In this way, the two combustible gases are mixed over a relatively short length, substantially adjacent to the face of the nozzle discharge, resulting in premature ignition that can result in flashback. Not only is the amount of possible gas mixtures extremely small, but this extremely small volume can be further subdivided by locating multiple gas mixing passages at angularly distributed locations to achieve localized mixing. It means that

The nozzle 1 described above, i.e. the force-fitted center and sleeve parts 13-14, are connected to the threaded part of the adapter 5 at the downstream end face of the intermediate adapter 5 (via the flanges 16-18 of these parts). The coupling sleeve joint 23 allows for detachment, in the same manner as already described for the sleeve 10 for detachably coupling the adapter 5 to the blowpipe body 3. And as mentioned above, before using the blowpipe, attach the adapter member 5 to each nozzle 1.
It is preferable to prepare pre-assembled parts so that they are included. That is, since nozzle replacement can be performed simply by hand on the joint sleeve 10, nozzle replacement can be performed even during a given task.

Figure 6 shows a modification of the structure related to Figures 1 to 5, and the main difference is that
The illustrated adapter member assembly 5'' is itself an assembly of multiple parts, and can be distinguished from adapter members 5 having a much more substantial (non-hollow) shape. In particular, the adapter member 5'' has a separate terminal coupling head 5'-
5", and connecting pipe 12-12'-12" between
This creates the individuality of the flow that is needed. Thus, the upstream head 5' divides portions of the central passage 6 and simultaneously separate inlet passages 8'' and 8''' into separate combustion gas components into respective interstitial gas distribution areas 11-11'. However, in the latter case (ie 11-11') its radially outwardly directed limit is closed. In addition, the downstream head 5'' has a central passage 6, and at the same time a manifold groove 25-25' and a fuel gas and oxygen supply passage 8 connected thereto.
8'. Connecting tubes 12-12'-12'' are suitably connected to the bores in heads 5'-5'' by brazing or other methods. The connection between the nozzle 1 and the blowpipe body 3 can be understood as shown in FIG. It will be appreciated that the configuration shown in FIG. 6 does not absolutely require the use of the distribution slot technique shown at 11-11'. In other words, even if there is a slight deviation due to bending when forming the connecting pipes 12'-12'', the pipe 1
2' are directly connected, so that the inlet passage 8'' is connected to the downstream passage 8, and the inlet passage 8'' is directly connected to the downstream passage 8'.

The adapter member 40 in the embodiment of FIG.
It will be appreciated that there is an identity with adapter 5 in FIG. 1, so the same reference numerals will be used where applicable. The difference is that the creation of separate annular manifolds for each of the gas component streams is completed within the body of the adapter, shown here in the first extended body member 41 (downstream thereof). having a large screw hole on the end surface) and a second main body member or plug 4 assembled into the screw hole of the member 41
2. Radially located manifold grooves 43-44 are formed in the upstream end face of the plug 42 and individually mate with one or more fuel gas passages 8 and oxygen flow passages 8', respectively. The plug 42 also has a number of discharge passages 16' positioned in communication with the nozzle inlet passage 16, with a distal passage 17' similarly connected to the nozzle inlet passage 17, and a key pin. 45 to ensure the required alignment.

The arrangement in FIG. 8 is such that, if desired, a radially located annular manifold can be provided upstream of the nozzle 1 in the plane of the connection, if desired. It is also possible to achieve this with annular grooves, with the radial mating being achieved by grooves 25-25' or simply by the respective passages 8-8' in the planar radially downstream end face in adapter member 52. It shows what can be achieved.

In the structure of the nozzle shown in FIG.
1 volume, the mixing process actually begins after the oxygen is discharged as a separate jet (from orifice 15') through mixing manifold 20. In practice, since the oxygen is always supplied at a pressure substantially higher than the pressure of the fuel gas, the fuel gas distributed into the mixing manifold 20 is therefore distributed over the same number of mixing passages that locally mix the combustible components. It gets sucked inside.
However, the initiation of mixing causes the dispersion of the mixed gas from one passage through the manifold 20 to the adjacent passage 2.
1, one passage 2
There is a theoretical possibility that a flashback in manifold 1 could spread to a flashback in manifold 20 and also enter the adjacent passageway 21. As a way to ensure against this unlikely event,
In FIG. 9, the annular manifold 20 in FIG.
may be replaced with a number of radially inwardly perforated passageways 55 in the central nozzle member 13, each passageway 55 being connected to the orifice 1.
5' and the extending annular manifold 19 can be isolated from each other.
Such a structure literally ensures isolation of each gas component and allows separate mixing of each in the respective mixing passage 21.

All of the embodiments described above have achieved the objectives set forth herein and have made an important contribution to the efficient use of gas blowpipes, whether or not the coating material is used for flame spraying purposes. It will become clear. In all cases, nozzle replacement is obtained with a simple manual operation and is made easier by the use of the intermediate adapter device of the present invention. Furthermore, by ensuring that the mixing of the separated gas components takes place only in close proximity to the flame discharge, flashback is avoided and the source of heat is located far away from the separable joint in the blowpipe body. Also, sealing ring 2 made of elastomer (rubber)
8 can be made at or near this separated portion, so it will not be damaged. If this were not the case, it would be considered necessary to carry out cooling, by forcing cooling air under pressure to flow through the annular space in the coupling sleeve 10, for example from the sleeve 10 via the passage 30. It should be drained. In a similar manner, a flanged annular member 29 (fitting into the sleeve part 22 of the nozzle and to the coupling sleeve) with a discharge passage 29'
and if the coupling member is extended to the length proposed in the form of the sleeve 60, the sleeve 60
The entire annular space therein could form a path for the pressurized cooling air flow to be discharged via the exhaust passage 29'.

Since it is recommended to keep a stock of gas mixing nozzles 1 each pre-assembled with an adapter member 5, such pre-assemblies can be carried out in service areas away from areas where the blowpipe is used. As such, tightening tools such as spanners will be readily available in the service area. In order to facilitate the use of the wrench and the removal of the tightened nozzle and adapter preassembly, the tightening sleeve 23 and the body portion 26 of the adapter 5 are preferably the same as the parallel parts of the wrench.

Although the invention has been described in detail in its preferred form, it will be appreciated that various modifications and changes may be made therein without departing from the scope of the claims.

For example, another embodiment of the adapter member is illustrated in FIGS. 10 through 17, which shows a transverse passageway or slot 61. In the embodiment of FIG. 1, the gas-tight sealing of the slot or transverse passageway 11 or 11' is
This is due to the action of the sleeve 24 connected to the sealing ring 28. In the embodiment of FIG.
(Please note Figure 5) At the same time as the items described below, sealing (hermetic sealing) can be performed without using a sealing ring.

The sealing ring 28 is limited by thermal strain forces caused by flashbacks and therefore cannot have the desired long life under certain circumstances. That is, the purpose of the embodiment shown in FIG.
You are trying to get a seal that has a longer lifespan.

Therefore, with respect to FIG. 10, the adapter 67 is
It takes the form of a metal body 66 between the joint head 73 (faintly visible) of the gas blowpipe and the nozzle 72 (also faintly visible), the latter in the form of an internal mixing nozzle in this example. There is. That is, oxygen is supplied through passages 71, 71' and fuel gas is supplied through passages 70, 70', which together mix only in approximately the front third of nozzle 72.

Fuel supply line 70 on the gas blowpipe side of the adapter
and the oxygen supply lines 71 generally lie on a common circle, but the inlets of the supply passages 70', 71' which are remote from it are located in the annular passages 70'', 70 with different diameters with respect to the nozzle coupling passages. In order to accomplish this, passage 7 must be discharged.
A transverse or slotted connection must be made between 0,70' and passages 71,71'. This is done by means of transverse passages or slots 61, 62, which are fitted or made from the outside, and which are mutually connected. You also need to understand the fact that it must be sealed from the outside.

This was made possible by the embodiments shown in Figures 10 to 12, but in this case, 2
The best sealing was achieved by using a cover sleeve 63 that can be pushed up and sealing the entire circumference of the end face 65 with the metal body 66 of the adapter 67, that is, by performing a soldering joint.
As can be seen from FIGS. 11 and 12, the transverse passages or slots 61, 62 encompass the entire cross-section of the adapter except for residual web portions 74 of material which serve as passages corresponding to other passages. Therefore, the passages 70', 71' are arranged so as to accumulate at uniformly spaced positions on the periphery, and the annular passages 70'', 70
form.

In the embodiment shown in FIGS. 13 and 14, the transverse passages or slots 61, 62 are formed by simple perforations 6.
It is designed in the shape of 1', 62', the outer part of which is widened in diameter, into which a metal plug is inserted for sealing, and this plug has its open head surface soldered. It is sealed tightly. This perforation 6
1', 62' can, of course, also be designed to be a screw hole, into which a set screw can be screwed and the screw can be suitably sealed.

In particular, if the transverse passage or slot 61,
62 is designed to have an arcuate shape, for example (see dashed line 75 in FIG. 11), the cover sleeve 63
It is not absolutely necessary to have the following. In such a case, a small cover shell 64 (see FIG. 15) is sufficient, which covers its end face 65.
Perform soldering.

When connecting the adapter 67 to the gas blowpipe (all coupling and retaining elements, such as cap sleeves or similar parts, are omitted in the drawings), it is possible to push the sleeve 63 or the shell 64. If this is not possible, it is possible to cut a flat wide annular groove 76 into the metal body 76, as shown in FIG. She is made to insert it right away. In this case, the annular groove 76
This should also be properly flattened, leaving enough room within its width to make the solder joint. In the case of the shell 64, the grooves 76 need not, of course, be completely round in their entirety, although for manufacturing reasons it is preferred that the annular grooves 76 be round. (This is simply because the work is done on a lathe.) Since the sleeves 63 and 64 have relatively thin wall sections and are divided, they have considerable elasticity.
The sleeve is pushed up onto the adapter and pushed into the annular groove 76.

However, if other structural conditions permit, the annular groove 76 may be used with one end or the other of the adapter 67 (strictly speaking, in this case there is no annular groove, and the metal body 66 Since there is only one external stage), a continuous sleeve can be pushed up onto the external stage.

The gas blowpipe side of the sleeve 63 has an annular flange 6
3', which also acts as a retaining flange for the cap sleeve which is screwed onto the gas blowpipe head 73, so that the adapter 67 has the shape of a retaining flange. There is an advantage that there is no need to cut the material to a corresponding thickness.

(1) Regarding the product, the adapter has a mounting part that can be attached to and detached from the gas blowpipe upstream thereof, and a device that receives the mounting part that can be attached and detached from the gas mixing nozzle downstream thereof, and the adapter has a central axis. an elongated body, the body having a first passage device for individually supplying oxygen to the attached nozzles; and a second passage device for individually supplying fuel gas to the attached nozzles; 1st
and the second passageway device have a single upstream end opening, but are separated from each other at the upstream end of the adapter. The first flow device has a first annular manifold at a downstream end face of the body, which is at a first radius with respect to the axis, and a formation of the first annular manifold has a first annular manifold. The installed nozzles cooperate with a plurality of angularly distributed openings for the installed nozzles to individually communicate the gases of the first manifold. The second passage device has a second annular manifold formation at the downstream end face of the body, which is at a second radius with respect to the axis, and which has a second annular manifold formation at the downstream end of the body.
The manifold formation cooperates with a second angularly distributed plurality of mounted nozzle openings to individually communicate gas of the second manifold to the mounted nozzles. The first and second plurality of openings are located with different geometries in the periphery and radial direction of the axis, and the annular portions of the dimensions are located radially with respect to each other. Fire-proof gas blowpipe equipment.

(2) In the device according to claim 12, the first and second manifold forming portions include:
A flashback prevention gas blowpipe appliance characterized by discrete annular grooves present on the downstream end face of the adapter.

(3) The apparatus of claim 12, wherein the first and second manifold formations cooperate with radially located annular grooves in adjacent upstream ends of the installed nozzle. A flashback-proof gas blowpipe appliance, characterized in that the adapter has a flat radial surface at the downstream end face for the purpose of the invention.

(4) Regarding products, for gas blowpipes that spray powder or emit flames,
An adapter that can be attached and detached at its upstream end has a mounting method that allows it to be attached and detached from a gas mixing, powder spraying, or flaming nozzle at its downstream end. an elongated body having a passageway passing through the center for supplying powder or other effluent, the body having a second passageway device for individually supplying oxygen to the attached nozzle; a third passage device for individually supplying fuel gas to the installed nozzles, the second and third passage devices having a single upstream end opening, which is connected to the central passage; and angularly diverge from each other at the upstream end face of the adapter, the second passage device having a first radial region at the downstream end face of the body and outside the central passageway. a first annular manifold formation, the first annular manifold formation having a plurality of first annular manifold formations configured to direct gas in the first manifold individually to the installed nozzles; The third passage device operates with angularly distributed openings and has a second annular manifold formation at the downstream end face of the body and at a second radius outside the central passage. Moreover, the second annular manifold forming part allows the gas of the second manifold that flows individually to the attached nozzle to be transferred to the second annular manifold forming part of the attached nozzle.
working with a plurality of angularly distributed apertures, the first and second plurality of apertures being annular with different dimensions about the central passageway and radially relative to the central passageway; 1. A backfire-proof gas blowpipe appliance, characterized in that the annular portions are positioned with mutually different dimensions in the radial direction.

(5) Regarding the product, the adapter has a mounting part on its upstream end surface that can be attached to and detached from a gas blowpipe, and a mounting part on its downstream end surface that can be attached to and detached from a gas mixing nozzle. contains an elongated body having a central axis;
The main body has a first passage device for individually supplying oxygen to the attached nozzles, and a second passage device for individually supplying fuel gas to the attached nozzles, and the first and second passage devices The passage device has a single upstream end opening that is separated from one another at the upstream end of the adapter, and the first flow device has a first opening within a first radius within the body. The manifold has an annular manifold and a plurality of angularly distributed passageways communicate with openings in the first corresponding plurality of downstream end faces for discharging the gases of the first manifold. The second flow device also has a second annular manifold within a second radius within the body, and has a number of angularly distributed passageways for discharging the gas of the second manifold. , a backfire prevention type gas blowpipe appliance, characterized in that the second plurality of downstream end face openings communicate with each other.

(6) The device of claim 16, wherein the first and second plurality of openings are in an annular portion having different dimensions about the axis and radially relative to the axis. 1. A flashback prevention type gas blowpipe device, characterized in that the annular portions of said dimensions are radially oriented toward each other and accumulate positions.

(7) A gas mixing blowpipe nozzle having an attachment part that can be attached to and removed from the gas blowpipe in the upstream part, and a discharge part for mixed oxygen and fuel gas in an annular part within a certain dimension around the central axis in the downstream part. in which the nozzle has a body, the body having an upstream end surface thereof which can be assembled end-to-end with a gas blowpipe, and the body having a mixing chamber arrangement concentrically distributed about the axis in the vicinity of a downstream portion thereof; The main body also has a plurality of mixed gas discharge passages connected to the mixing chamber device to allow the nozzle to perform a discharge operation, and separate first and second inlet passage devices are arranged to discharge the incoming fuel gas and the incoming fuel gas. an inlet passage arrangement for the fuel gas supply including an elongated cylindrical manifold surrounding the oxygen inlet passage arrangement; A flashback prevention type gas blowpipe appliance, characterized in that the cylindrical manifold is modified to have the mixing chamber device and passages distributed on the circumference.

(8) The improvement set forth in claim 18, wherein the mixing chamber device is an annular mixing manifold around the shaft.

(9) The improvement as claimed in claim 18, wherein the mixing chamber arrangement contains a number of individual radially inwardly directed fuel gas passages and also includes a similar oxygen inlet passage arrangement. including a plurality of individually longitudinally extending passageways, each of which has a different one of said radially inwardly extending passageways.
The cylindrical manifold intersects with
A flashback-proof gas blowpipe appliance characterized in that it is in common communication with all said radially inward passageways.

(10) Adapter 6 for flashback prevention type gas blowpipe device
7, it has a metal body 66 with a powder carrying gas passage in the center and a fuel and gas passage brought in from the gas blowpipe equipment side around the periphery, and this passage has transverse passages or slots (cuts) 61, 6.
2, this slot is covered from the outside and the transverse passage leads to the nozzle connection end of the gas blowpipe, but in the adapter the transverse passages 61, 62 are covered by a cover sleeve 63 or a cover closed by a shell 64 and a sleeve 63 or cover shell 64
An adapter for a blowpipe instrument, characterized in that the adapter is sealed along an end surface 65 to a metal body 66 of an adapter 67.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the axis of the head end face of the gas blowpipe according to the present invention in the longitudinal direction. 2 is a view showing the end of a surface that connects one upstream end surface of the component parts shown in FIG. 1, and a sectional view taken along the line -- in FIG. 1; Figure 3 is a view showing the downstream end face or the end of the nozzle coupling face of the component in Figure 2, and the line in Figure 1.
A sectional view cut along. FIG. 4 is a sectional view taken along the line - in FIG. 1. FIG. 5 is a sectional view taken along the line - in FIG. 1. FIG. 6 is a simplified cross-sectional view, partially cut in the longitudinal direction, of another embodiment. 7 and 8 are cross-sectional views showing other embodiments similar to FIG. 1. FIG. 9 is a sectional view taken along the line - in FIG. 1. This shows a structure in which the parts of the combustible gas mixing part of the nozzle have been modified. FIG. 10 is a longitudinal sectional view showing one embodiment of the gas blowpipe adapter. FIG. 11 is a cross-sectional view taken along line XI--XI in FIG. 10. FIG. 12 is a cross-sectional view taken along line XII--XII in FIG. 10. FIG. 13 is a cross-sectional view similar to FIG. 11 but showing a different embodiment. FIG. 14 is a cross-sectional view similar to FIG. 12, but showing a different embodiment. FIG. 15 is a perspective view of a gas blowpipe adapter with a cover shell. FIG. 16 is a cross-sectional view with another embodiment and gas blowpipe adapter. and FIG. 17 is a cross-sectional view of the use of a cover sleeve on the adapter. In the figure, 1... nozzle, 3... blowpipe body, 4,
4', 4''...passage, 5...adapter, 6-6'-6''...
Powder passage, 7...downstream joint end surface, 8-8'-8''...fuel gas passage, 9, 9'...upstream end, 11, 11'...
Slot, 13, 14...Flanged member, 15...
Oxygen gas passage, 16...flange, 17...fuel gas passage, 20...groove, 21...gas mixing passage, 22...
Downstream end face, 23... Sleeve joint, 25, 25'...
Manifold groove, 28... O ring, 30... Sleeve joint, 40... Adapter member, 41... Member, 4
2...Plug, 43, 44...Annular groove, 45...Key,
50, 51... Annular groove, 52... Intermediate adapter, 61
...Slot, 63...Sleeve, 64...Ciel, 6
6... Metal body, 67... Adapter, 70, 70'... Fuel gas passage, 71, 71'... Oxygen passage, 72... Nozzle, 76... Groove.

Claims (1)

[Claims] 1. The replaceable nozzle 1 has passages 8, 8' for introducing two combustible gas components up to its connection point;
It has passages 15 and 17 with an annular manifold passage 19 provided therebetween, and a sleeve member 14, and has the purpose of mixing each component of the combustible gas in the ring-shaped structure 20 inside this nozzle. powder flow passages 6, 6' extending into the nozzle;
This blowpipe is of a flashback prevention type in which a metal coating material having a diameter of 6" is sprayed onto a metal substrate, and a separable intermediate adapter element 5 is provided with slots 11 and 11' for distributing gas components, and It is connected to channels 8'', 8 extending from the coupling surface 2 with the element 5 and from there communicates the channels 8, 8' to the nozzle 1, in which the channels 8 are connected via channels 17 and an annular manifold 19. A sleeve member 14 having a central member 13 and a flange, in which ring-shaped grooves 20 are connected at a certain interval in the nozzle connection side direction, and an annular manifold 19 for the front surface 27 of the nozzle 1 is located within these downstream end faces 22. A flashback prevention type gas blowpipe device characterized in that the other passage 8' is connected to another passage 15 by a groove 20 within the nozzle 1. 2. The central member 13 and the sleeve member 14 have flanges 16, 18 adjacent to each other, and these flanges are fixed to the intermediate member by a sleeve joint 23,
The flashback prevention type gas blowpipe appliance according to claim 1, wherein a passage 17 is provided in the flange 16 at the center. 3 adapter element 5 is two adapter elements 5',
5'', then connecting pipes 12, 12', 1
2'', and their connecting pipes are the powder passage 6 and the passages 8, 8'.
The flashback-preventing gas blowpipe appliance described in item 1 or 2. 4. The sleeve member 14 and the center member 13, together with their adjacent flanges 16 and 18, are separably fixed to the adapter element 5 by the sleeve joint 23, and the integrated nozzle 1 and adapter element 5 form a coupling member. 10. A flashback prevention type gas blowpipe appliance according to claim 2 or 3, which is separably fixed to the blowpipe main body 3 by a blowpipe 10. 5. A flashback-proof gas blowpipe appliance as claimed in any one of claims 1 to 4, in which the distribution slots 11, 11' are arranged in the intermediate member 24 of the intermediate adapter element 5. 6 Flanged member 1 adjacent to downstream end surface 22
3 and the sleeve member 14 have slightly conical circumferential surfaces. A flashback prevention type gas blowpipe appliance as claimed in any one of claims 1 to 5.