Ring hole sprayer and smoke and fire cutting torch

Abstract

The invention discloses an annular hole spray head and a smoke and fire cutting torch, and relates to the technical field of special cutting equipment. The nozzle is provided with a hollow containing cavity and a communicating opening communicating with the hollow containing cavity. A plurality of nozzles are formed in the side wall of the nozzle and are uniformly distributed in the circumferential direction around the axis of the nozzle; each nozzle is communicated with the hollow accommodating cavity; an internal thread is arranged at the communicating opening and is in threaded connection with an external thread of a connecting interface pipe at the front end of a combustion chamber of the smoke and fire cutting torch; when the sealing ablation block is arranged in the hollow accommodating cavity, the sealing ablation block can block each nozzle; in the axis direction of the nozzle, one end, close to the connecting interface pipe, of the sealing ablation block can be pressed by the end part of the connecting interface pipe; and the sealing ablation block is made of a material which can be ablated and melted or vaporized by the melting jet flow. Sealing before working and quick opening during working can be guaranteed, the whole structure is simple, microminiaturization setting is supported, and the cutting effect is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of special cutting equipment, in particular to an annular hole nozzle and a pyrotechnic cutting torch. Background Art

[0002] With the increasing application of small-diameter oil pipes (such as 2 inches and 1.5 inches) in the oil and gas extraction industry, the working space of downhole cutting devices has become increasingly narrow, and the difficulty of operation has also increased. Limited by the size of the cutting head and the cutting efficiency, the mechanical internal cutter widely used in large-diameter oil pipes has been difficult to play a role. In contrast, pyrotechnic cutting has shown greater application potential due to its advantages such as strong flexibility, fast cutting speed, low cost and smooth incision. Therefore, in the current complex and changeable downhole operating environment, pyrotechnic cutting technology will become an ideal choice to solve the problem of oil pipe cutting. At the same time, for small-diameter continuous oil pipe cutting operations, the miniaturization technology of pyrotechnic cutting torches is becoming an important development direction.

[0003] The pyrotechnic cutting torch is a device that uses the thermal and pneumatic effects of pyrotechnic powder to achieve the cutting of metal pipes in oil fields. In order to meet the technical challenges of miniaturization, it is crucial to innovate the design of key components of pyrotechnic cutting tools, including combustion chambers, ignition systems, and nozzles. In particular, as a core component, it is necessary to support the sealing of the nozzle before work and to quickly open the nozzle to achieve cutting during work, and to simplify the structure to achieve miniaturization and ensure the cutting effect. Summary of the invention

[0004] The purpose of the present invention is to provide a ring hole nozzle and a pyrotechnic cutting torch to solve the problems existing in the above-mentioned prior art, which can ensure sealing before work and can be quickly opened during work, have a simple overall structure, support miniaturization settings, and ensure cutting effects.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides an annular hole nozzle, comprising a nozzle and a sealing ablation block; the nozzle has a hollow accommodating cavity and a connecting opening connected to the hollow accommodating cavity; a plurality of nozzles are arranged on the side wall of the nozzle, and each of the nozzles is evenly distributed circumferentially around the axis of the nozzle; each of the nozzles is connected to the hollow accommodating cavity; an internal thread is arranged at the connecting opening, and the internal thread is used for being threadedly connected with the external thread of a connecting interface pipe at the front end of a combustion chamber of a pyrotechnic cutting torch; when the sealing ablation block is arranged in the hollow accommodating cavity, the sealing ablation block can block each of the nozzles; and in the axial direction of the nozzle, one end of the sealing ablation block close to the connecting interface pipe can be crimped by the end of the connecting interface pipe; the material of the sealing ablation block is selected to be a material that can be melted or vaporized by molten jet ablation.

[0007] Preferably, the sealing ablation block has a hollow groove, and the opening of the hollow groove and the connecting opening are located on the same side; in the axial direction of the nozzle, the bottom of the hollow groove is lower than each of the nozzles.

[0008] Preferably, an outer liner ring sleeve is fixedly provided on the outer side of the nozzle, and a plurality of outer constraint openings corresponding to the nozzle openings are provided on the outer liner ring sleeve; the outer liner ring sleeve has better ablation resistance than the nozzle.

[0009] Preferably, an inner lining ring is fixedly disposed in the hollow accommodating cavity, and a plurality of inner restraint openings corresponding to the nozzles are disposed on the inner lining ring; the inner lining ring has better ablation resistance than the nozzle.

[0010] Preferably, a limiting groove is provided on the inner bottom surface of the hollow accommodating cavity, and a limiting protrusion extends from the lower end of the lining ring sleeve; when the limiting protrusion is located in the limiting groove, the lining ring sleeve cannot rotate around the axis of the nozzle; the end of the lining ring sleeve away from the limiting protrusion can be crimped by the end of the connecting interface pipe.

[0011] Preferably, the upper end of the sealing ablation block is located in the connecting interface tube; and a sealing groove is provided on the circumferential outer wall of the sealing ablation block located in the connecting interface tube, and a sealing ring is provided in the sealing groove.

[0012] Preferably, an accessory connecting column is extended from one end of the nozzle away from the connection interface pipe, and an annular connecting groove is arranged on the accessory connecting column.

[0013] Preferably, high temperature resistant glue is provided between the outer side wall of the inner liner ring sleeve and the inner side wall of the hollow accommodating cavity and between the inner side wall of the outer liner ring sleeve and the outer side wall of the nozzle.

[0014] Preferably, the inner diameter of the outer constraint port is 0.5 mm to 1 mm larger than the inner diameter of the nozzle.

[0015] The present invention also provides a pyrotechnic cutting torch, comprising a ring-hole nozzle and a connecting interface pipe as described in any of the above items; the external thread arranged at the end of the connecting interface pipe is used for threaded connection with the internal thread of the nozzle; an inner tube is arranged inside the connecting interface pipe; a flow port is arranged at the end of the connecting interface pipe; an anti-burning ring is arranged between the inner tube and the flow port; the inner diameter of the inner tube is larger than the inner diameter of the anti-burning ring; the inner diameter of the anti-burning ring is larger than the inner diameter of the flow port.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] The annular hole nozzle provided by the present invention adopts a sealing ablation block that can be ablated, melted or vaporized by a molten jet, which can form a seal at each nozzle before working to isolate the internal and external environments. During operation, the molten jet is ejected from the combustion chamber, quickly burns the sealing ablation block and ejects from each nozzle, thereby achieving annular cutting of the target. Its simple structure can support miniaturized settings and can still have a good sealing effect at different sizes, which is a prerequisite for miniaturized settings. The setting of nozzles evenly distributed circumferentially can effectively control the ejection mode of the molten jet while ensuring structural strength, thereby improving cutting efficiency; the structure of the sealing ablation block combined with the nozzle breaks through the application limitations of traditional pyrotechnic cutting torches in small-diameter oil pipes, supports miniaturized settings, reduces the volume and weight of the tool string, and can be operated more flexibly in narrow or complex underground environments, significantly improving operating efficiency and convenience.

[0018] Furthermore, the hollow groove provided on the sealing ablation block can increase the contact area between the molten jet and the sealing ablation block when the molten jet flows to this position, thereby accelerating the burning speed of the sealing ablation block and making it respond more quickly.

[0019] Furthermore, the outer liner ring can form an external stabilizing structure for the nozzle, and the outer constraint port can constrain the ejected molten jet, thereby effectively controlling the ejection shape of the molten jet.

[0020] Furthermore, the inner lining ring can form an internal stabilizing structure for the nozzle, and the inner constraint port can constrain the molten jet entering the nozzle, making it enter the nozzle more stably and reliably; and it can reduce the impact of the molten jet on the nozzle inlet, thereby extending the service life of the nozzle.

[0021] Furthermore, the inner liner ring sleeve adopts a structure in which a limiting protrusion cooperates with a limiting groove in the hollow accommodating cavity to achieve limitation of circumferential rotation, and an axial limit is formed by crimping the end of the interface pipe and the inner bottom surface of the hollow accommodating cavity. The structure is simple and convenient for processing, manufacturing and installation of the limit.

[0022] Furthermore, the upper end of the sealing ablation block is located in the connecting interface tube, and cooperates with the sealing ring to enhance the sealing effect of each nozzle, thereby ensuring stable and reliable sealing performance.

[0023] Furthermore, the accessory connection column can support the installation and use of the measuring instrument, making its installation easier and faster.

[0024] Furthermore, high temperature resistant glue is used when installing the inner liner ring sleeve and the outer liner ring sleeve, which can not only play an auxiliary fixing role, but also fill the corresponding gaps between the two and the nozzle to ensure better resistance to the jet.

[0025] Furthermore, the inner diameter of the outer constraint port is 0.5 mm to 1 mm larger than the inner diameter of the nozzle, which can reduce the possibility of rupture during jet impact and can effectively resist jet ablation, thereby achieving a good beam effect.

[0026] The present invention also provides a pyrotechnic cutting torch, in which an inner tube is arranged in the connecting interface tube, and an anti-burning ring is arranged between the inner tube and the flow port to withstand ultra-high temperature and avoid ablation of the flow port of the connecting interface tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the overall structure of the annular hole nozzle provided by the present invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure at AA in the middle;

[0030] Figure 3 A schematic diagram of the structure of the nozzle in the annular hole nozzle provided by the present invention;

[0031] Figure 4 A schematic diagram of the structure of the sealed ablation block in the annular hole nozzle provided by the present invention;

[0032] Figure 5 A schematic diagram of the structure of the outer liner ring sleeve in the annular hole nozzle provided by the present invention;

[0033] Figure 6 This is a schematic structural diagram of the inner liner ring sleeve in the annular hole nozzle provided by the present invention.

[0034] In the figure:

[0035] 10-nozzle; 11-hollow accommodating cavity; 12-connecting opening; 13-spout; 14-internal thread; 15-limiting groove; 16-accessory connecting column; 17-small threaded hole; 18-sprinkler connecting rib;

[0036] 20-sealing ablation block; 21-hollow groove; 22-sealing groove; 23-sealing ring;

[0037] 30- lining ring sleeve; 31- inner restraining opening; 32- limiting protrusion;

[0038] 40-outer liner ring; 41-outer restraining opening; 42-through hole;

[0039] 50-connection interface pipe; 51-flow port; 52-first limit step; 53-second limit step;

[0040] 60-inner tube;

[0041] 70-Anti-burning ring. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The purpose of the present invention is to provide a ring hole nozzle and a pyrotechnic cutting torch to solve the problems existing in the prior art, which can ensure the sealing before work and can be quickly opened during work, have a simple overall structure, support miniaturization settings, and ensure cutting effects.

[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0045] Embodiment 1

[0046] This embodiment provides a ring hole nozzle, which is mainly but not limited to the application on the pyrotechnic cutting torch, such as Figure 1 to Figure 6 As shown, it includes a nozzle 10 and a sealing ablation block 20; the nozzle 10 has a hollow accommodating chamber 11 and a connecting opening 12 connected to the hollow accommodating chamber 11; a plurality of nozzles 13 are arranged on the side wall of the nozzle 10, and each nozzle 13 is evenly distributed circumferentially around the axis of the nozzle 10; each nozzle 13 is connected to the hollow accommodating chamber 11; an internal thread 14 is arranged at the connecting opening 12, and the internal thread 14 is used for being threadedly connected with the external thread of the connecting interface pipe 50 at the front end of the combustion chamber of the pyrotechnic cutting torch; when the sealing ablation block 20 is arranged in the hollow accommodating chamber 11, the sealing ablation block 20 can block each nozzle 13; and in the axial direction of the nozzle 10, one end of the sealing ablation block 20 close to the connecting interface pipe 50 can be crimped by the end of the connecting interface pipe 50; the material of the sealing ablation block 20 is selected to be a material that can be melted or vaporized by molten jet ablation.

[0047] By adopting a sealing ablation block 20 that can be melted or vaporized by a molten jet, it can form a seal at each nozzle 13 before working, isolating the internal and external environments. During operation, the molten jet is ejected from the combustion chamber, quickly burns the sealing ablation block 20 and ejects from each nozzle 13, thereby achieving circumferential cutting of the target. Its simple structure can support miniaturized settings and can still have a good sealing effect under different sizes, which is the premise of miniaturized settings. The setting of the nozzles 13 evenly distributed in the circumference can effectively control the ejection mode of the molten jet while ensuring the structural strength, thereby improving the cutting efficiency; the sealing ablation block 20 used in combination with the structure of the nozzle 10 breaks through the application limitations of traditional pyrotechnic cutting torches in small-diameter oil pipes, supports miniaturized settings, reduces the volume and weight of the tool string, and can be operated more flexibly in narrow or complex underground environments, significantly improving operating efficiency and convenience.

[0048] Among them, description of other related structures on the nozzle 10:

[0049] Specifically, the hollow accommodating chamber 11 in the nozzle 10 is a hollow cylindrical shape, and its outer contour includes a first cylinder, a second cylinder and a third cylinder fixedly connected together in sequence from top to bottom; and the outer diameter gradually decreases from top to bottom. The hollow accommodating chamber 11 includes a connecting chamber and a liner shelf chamber, the connecting chamber is close to the connecting opening 12, and the inner diameter of the connecting chamber is larger than the inner diameter of the liner shelf chamber; the connecting chamber is located in the first cylinder, and an internal thread 14 is provided on the inner side wall of the connecting chamber, the liner shelf chamber is located in the second cylinder, and the upper end portion of the liner shelf chamber is located in the first cylinder.

[0050] Specifically, the nozzle 13 is circular, which can effectively control the ejection of the molten jet.

[0051] Specifically, the inner diameter of the nozzle 13 is 5 mm to 10 mm.

[0052] Specifically, the number of nozzles 13 is determined according to the outer diameter of the nozzle 10. In principle, the straight-line distance between two points at the thinnest part of the nozzle 13 (e.g. Figure 2 As shown, the minimum distance between two adjacent nozzles 13, that is, the weakest point of the nozzle connecting rib 18 between two adjacent nozzles 13) should be greater than 1 mm.

[0053] Specifically, the nozzles 13 are located on the outer side wall of the second cylinder, and two small threaded holes 17 are symmetrically provided on the outer side wall of the second cylinder below each nozzle 13 for assembling accessories.

[0054] Specifically, the third cylinder forms an accessory connecting column 16, and an annular connecting groove is provided on the outer side wall thereof for connecting a measuring instrument below.

[0055] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 3 As shown, an accessory connection column 16 is extended from one end of the nozzle 10 away from the connection interface tube 50, and an annular connection groove is provided on the accessory connection column 16. The accessory connection column 16 can support the installation and use of the measuring instrument, making its installation simpler and faster.

[0056] Among them, descriptions of other related structures of the sealed ablation block 20 are as follows:

[0057] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 4 As shown, the sealing ablation block 20 has a hollow groove 21, and the opening of the hollow groove 21 is located on the same side as the communication opening 12; in the axial direction of the nozzle 10, the bottom of the hollow groove 21 is lower than each nozzle 13. The hollow groove 21 provided on the sealing ablation block 20 can increase the contact area between the molten jet and the sealing ablation block 20 when the molten jet flows to this position, thereby accelerating the burning speed of the sealing ablation block 20 and making it respond more quickly.

[0058] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 4 As shown, the upper end of the sealing ablation block 20 is located in the connection interface tube 50; and a sealing groove 22 is provided on the circumferential outer wall of the sealing ablation block 20 located in the connection interface tube 50, and a sealing ring 23 is provided in the sealing groove 22. The upper end of the sealing ablation block 20 is located in the connection interface tube 50, and cooperates with the sealing ring 23 to enhance the sealing effect of each nozzle 13, ensuring stable and reliable sealing performance.

[0059] Specifically, the sealing ablation block 20 is a cylinder with a stepped structure, the outer diameter of its upper end corresponds to the inner diameter of the connecting interface pipe 50, and the sealing groove 22 is arranged at a position corresponding to the connecting interface pipe 50 at its upper end; the outer diameter of the lower end of the sealing ablation block 20 is consistent with the inner diameter of the liner ring sleeve 30, and the hollow groove 21 is cylindrical, which ensures that the position thickness of each corresponding nozzle 13 remains consistent.

[0060] Specifically, the sealing ablation block 20 is made of aluminum alloy, copper alloy, or polyetheretherketone (PEEK), which are materials with low melting points, easy ablation, easy melting or vaporization properties.

[0061] Specifically, the wall thickness of the sealing ablation block 20 must meet the pressure to be borne in the well, and in principle, the thinner the better.

[0062] Among them, the relevant description about the inner liner ring sleeve 30 and the outer liner ring sleeve 40 provided on the nozzle 10 is as follows:

[0063] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 6As shown, a liner ring 30 is fixedly arranged in the hollow accommodation cavity 11, and a plurality of inner restraint ports 31 corresponding to each nozzle 13 are arranged on the liner ring 30; the liner ring 30 has better ablation resistance than the nozzle 10. The liner ring 30 can form an internal stable structure for the nozzle 10, and the inner restraint ports 31 can restrain the molten jet entering the nozzle 13, so that it can enter the nozzle 13 more stably and reliably; and it can reduce the impact of the molten jet on the inlet of the nozzle 13, thereby extending the service life of the nozzle 10.

[0064] Specifically, the inner liner ring 30 is a thin-walled tubular structure, and is provided with a plurality of inner restraining openings 31 having the same number and diameter as the nozzles 13 .

[0065] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 6 As shown, the inner bottom surface of the hollow accommodating chamber 11 is provided with a limiting groove 15, and the lower end of the liner ring sleeve 30 extends with a limiting protrusion 32; when the limiting protrusion 32 is located in the limiting groove 15, the liner ring sleeve 30 cannot rotate around the axis of the nozzle 10; the end of the liner ring sleeve 30 away from the limiting protrusion 32 can be crimped by the end of the connecting interface pipe 50. The liner ring sleeve 30 uses the limiting protrusion 32 to cooperate with the limiting groove 15 in the hollow accommodating chamber 11 to limit the circumferential rotation, and the axial limit is formed by the crimping of the end of the connecting interface pipe 50 and the inner bottom surface of the hollow accommodating chamber 11. The structure is simple and convenient for processing, manufacturing and installation.

[0066] Specifically, the limiting groove 15 is a half annular groove, and the limiting protrusion 32 is a half annular protrusion.

[0067] Specifically, the material of the liner ring sleeve 30 is graphite to withstand the ultra-high temperature of the jet.

[0068] Specifically, the thickness of the liner ring 30 is 1.5 mm to 3 mm.

[0069] In the optional scheme of this embodiment, it is more preferred that Figure 1 and Figure 5 As shown, an outer liner ring sleeve 40 is fixedly arranged outside the nozzle 10, and a plurality of outer constraint openings 41 corresponding to the nozzle openings 13 are arranged on the outer liner ring sleeve 40; the outer liner ring sleeve 40 has better ablation resistance than the nozzle 10. The outer liner ring sleeve 40 can form an external stable structure for the nozzle 10, and the outer constraint openings 41 can constrain the ejected molten jet, effectively controlling the ejection shape of the molten jet.

[0070] In the optional scheme of this embodiment, it is more preferred that the inner diameter of the outer constraint port 41 is 0.5 mm to 1 mm larger than the inner diameter of the nozzle 13. The inner diameter of the outer constraint port 41 is 0.5 mm to 1 mm larger than the inner diameter of the nozzle 13, which can reduce the rupture during the jet impact and can effectively resist jet ablation, thereby achieving a good beam effect.

[0071] Specifically, the outer liner ring sleeve 40 is also a thin-walled tubular structure.

[0072] Specifically, a through hole 42 corresponding to the small threaded hole 17 on the nozzle 10 is formed on the side wall of the outer liner ring sleeve 40, and the outer liner ring sleeve 40 is sleeved on the outside of the nozzle 10 (specifically, it is sleeved on the outside of the second cylinder of the nozzle 10, the length of the outer liner ring sleeve 40 is consistent with that of the second cylinder, and the outer diameter of the outer liner ring sleeve 40 is consistent with the outer diameter of the first cylinder), and the outer liner ring sleeve 40 is fixed by riveting or threaded connection, and each external constraint port 41 corresponds to each nozzle 13 one by one.

[0073] Specifically, the outer liner ring sleeve 40 is made of high temperature resistant materials such as tungsten copper alloy, molybdenum alloy or ceramics; in addition to the above-mentioned materials, any high temperature resistant material that can meet the requirements can be used.

[0074] Specifically, the thickness of the outer liner ring sleeve 40 is 1 mm to 2 mm.

[0075] Specifically, the inner liner sleeve 30 and the outer liner sleeve 40 have better ablation resistance than the nozzle 10, and also have to have a certain strength. The inner liner sleeve 30 has a higher requirement for compressive strength, and the outer liner sleeve 40 has a higher requirement for tensile strength. The outer liner sleeve 40 needs a certain strength to avoid failure due to damage during the downhole process, as well as damage caused by jet impact.

[0076] Among them, regarding other related instructions:

[0077] In the optional scheme of this embodiment, preferably, high temperature resistant glue is provided between the outer wall of the inner liner ring sleeve 30 and the inner wall of the hollow accommodating cavity 11, and between the inner wall of the outer liner ring sleeve 40 and the outer wall of the nozzle 10. When the inner liner ring sleeve 30 and the outer liner ring sleeve 40 are installed, the high temperature resistant glue is used, which can not only play an auxiliary fixing role, but also fill the corresponding gap between the two and the nozzle 10 to ensure better bearing of the jet.

[0078] Specifically, by using the inner liner sleeve 30 and the outer liner sleeve 40 made of high temperature resistant materials such as graphite, tungsten copper alloy, etc., the nozzle 10 can effectively resist jet impact and ablation and maintain long-term stable working performance.

[0079] Embodiment 2

[0080] This embodiment provides a pyrotechnic cutting torch, such as Figure 1 As shown, it includes the annular hole nozzle and the connecting interface pipe 50 as in the first embodiment; the external thread arranged at the end of the connecting interface pipe 50 is used for threaded connection with the internal thread 14 of the nozzle 10; an inner tube 60 is arranged in the connecting interface pipe 50; a flow port 51 is arranged at the end of the connecting interface pipe 50; an anti-burning ring 70 is arranged between the inner tube 60 and the flow port 51; the inner diameter of the inner tube 60 is larger than the inner diameter of the anti-burning ring 70; the inner diameter of the anti-burning ring 70 is larger than the inner diameter of the flow port 51.

[0081] An inner tube 60 is disposed in the connecting interface tube 50 , and an anti-burning ring 70 is disposed between the inner tube 60 and the flow opening 51 to withstand ultra-high temperatures and avoid ablation of the flow opening 51 of the connecting interface tube 50 .

[0082] Specifically, a first limiting step 52 and a second limiting step 53 are provided in the flow port 51 of the connecting interface tube 50. The first limiting step 52 is used to crimp the upper end of the sealing ablation block 20, and the second limiting step 53 is used to crimp the upper end of the liner ring sleeve 30 to prevent the sealing ablation block 20 and the liner ring sleeve 30 from moving up and down.

[0083] In order to better use the nozzle 10, the front end of the combustion chamber of the miniaturized pyrotechnic cutting torch should be processed with a matching connecting interface pipe 50, and the connecting interface pipe 50 is a thick-walled tubular structure.

[0084] Specifically, the anti-burning ring 70 is made of graphite.

[0085] Specifically, the pyrotechnic cutting torch also includes other necessary components, including but not limited to a main unit, an ignition unit, and matching reagents, etc. The other necessary components are existing parts and will not be described in detail here.

[0086] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A ring hole nozzle, characterized in that: including a nozzle and a sealed ablative block; The nozzle has a hollow accommodating cavity and a communicating opening communicating with the hollow accommodating cavity; a plurality of nozzles are arranged on the side wall of the nozzle, and each of the nozzles is evenly distributed circumferentially around the axis of the nozzle; each of the nozzles is communicated with the hollow accommodating cavity; an internal thread is arranged at the communicating opening, and the internal thread is used for threading connection with the external thread of the connecting interface pipe at the front end of the combustion chamber of the pyrotechnic cutting torch; When the sealing ablation block is arranged in the hollow accommodating cavity, the sealing ablation block can block each of the nozzles; and in the axial direction of the nozzle, one end of the sealing ablation block close to the connecting interface pipe can be crimped by the end of the connecting interface pipe; The sealing ablation block is made of a material that can be melted or vaporized by a molten jet ablation.

2. The ring hole nozzle according to claim 1, characterized in that: The sealing ablation block has a hollow groove, and the opening of the hollow groove and the communicating opening are located on the same side; In the axial direction of the nozzle, the bottom of the hollow groove is lower than each of the nozzles.

3. The ring hole nozzle according to claim 1, characterized in that: An outer liner ring sleeve is fixedly arranged on the outside of the nozzle, and a plurality of outer restraint openings corresponding to the nozzle openings are arranged on the outer liner ring sleeve; The outer liner ring has better ablation resistance than the nozzle.

4. The ring hole nozzle according to claim 3, characterized in that: An inner lining ring is fixedly arranged in the hollow accommodating cavity, and a plurality of inner restraint openings corresponding to the nozzles are arranged on the inner lining ring; The liner ring has better ablation resistance than the nozzle.

5. The ring hole nozzle according to claim 4, characterized in that: The inner bottom surface of the hollow accommodating cavity is provided with a limiting groove, and the lower end of the lining ring sleeve is extended with a limiting protrusion; When the limiting protrusion is located in the limiting groove, the liner ring cannot rotate around the axis of the nozzle; One end of the lining ring sleeve away from the limiting protrusion can be crimped by the end of the connecting interface pipe.

6. The ring hole nozzle according to claim 1, characterized in that: The upper end of the sealing ablation block is located in the connecting interface tube; A sealing groove is arranged on the circumferential outer wall of the sealing ablation block located in the connecting interface tube, and a sealing ring is arranged in the sealing groove.

7. The ring hole nozzle according to claim 1, characterized in that: An accessory connecting column is extended from one end of the nozzle away from the connecting mouthpiece, and an annular connecting groove is arranged on the accessory connecting column.

8. The ring hole nozzle according to claim 4, characterized in that: High temperature resistant glue is provided between the outer side wall of the inner liner ring sleeve and the inner side wall of the hollow accommodating cavity and between the inner side wall of the outer liner ring sleeve and the outer side wall of the nozzle.

9. The ring hole nozzle according to claim 3, characterized in that: The inner diameter of the outer constraint port is 0.5 mm to 1 mm larger than the inner diameter of the nozzle port.

10. A pyrotechnic cutting torch, characterized in that: It comprises a ring hole nozzle and a connecting interface pipe as claimed in any one of claims 1 to 9; The external thread provided at the end of the connecting interface pipe is used for threaded connection with the internal thread of the nozzle; An inner tube is arranged inside the connecting interface tube; a flow port is arranged at the end of the connecting interface tube; an anti-burning ring is arranged between the inner tube and the flow port; the inner diameter of the inner tube is larger than the inner diameter of the anti-burning ring; the inner diameter of the anti-burning ring is larger than the inner diameter of the flow port.

Images