Punching nozzle for smoke and fire cutting torch

Abstract

The utility model discloses a punching nozzle for a smoke and fire cutting torch, which relates to the technical field of special cutting equipment under a petroleum well and comprises a nozzle, a plug and a plug. The nozzle is provided with a through communication channel; a spraying hole is formed in the side wall of the nozzle; the plug is provided with an accommodating cavity and a communicating port; the communicating port communicates with an opening in one end of the communicating channel; the plug is arranged in the communicating channel in a sealed mode and can move in the communicating channel along the axis of the communicating channel. The communicating channel, the communicating port and the accommodating cavity are coaxially arranged; when the plug blocks the ejection hole, the upper end of the plug is located in the communicating channel, the lower end of the plug is located in the communicating opening, and the inner diameter of the communicating opening is not smaller than the outer diameter of the plug; the plug is made of a material which can be ablated and melted or vaporized by the melting jet flow; and after the plug is impacted and ablated by the fusion jet flow, the upper end of the plug is lower than the ejection hole. And efficient and reliable punching operation can be realized by means of the smoke and fire cutting torch.

Description

Technical Field

[0001] The utility model relates to the technical field of special cutting equipment for petroleum wells, in particular to a perforating nozzle for a pyrotechnic cutting torch. Background Art

[0002] In downhole operations in the oilfield, drilling plays an important role in the completion, workover, and testing processes. Faced with the challenge of a stuck fracturing string, precise drilling operations can establish a sand flushing circulation channel, effectively clearing obstructions and thus resuming the operation process. During the workover process of the production tubing, drilling and oil drainage operations can not only safely control the well pressure, but also efficiently discharge the fluid in the well. In addition, the well pressure circulation channel established by drilling helps to remove impurities and debris in the wellbore, ensuring the smooth progress of the well pressure operation. The drilling operation is also a key step in installing some cutting tools and testing equipment. In short, drilling technology not only ensures the smooth progress of oil well construction, but is also a key link in improving operational efficiency and safety.

[0003] The pyrotechnic cutting torch is an ideal tool for eroding and cutting downhole oil pipes by burning pyrotechnic powder and spraying a high-temperature jet from a specially designed nozzle. It is highly efficient, reliable, and low-cost. Therefore, pyrotechnic cutting has broad application prospects for drilling downhole oil pipes. Utility Model Content

[0004] The purpose of the utility model is to provide a drilling nozzle for a pyrotechnic cutting torch, so as to solve the problems existing in the above-mentioned prior art and to achieve efficient and reliable drilling operation by relying on the pyrotechnic cutting torch.

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

[0006] The utility model provides a perforating nozzle head for a pyrotechnic cutting torch, comprising a nozzle, a plug and a plug; the nozzle has a through-communication passage, one end of the communication passage is used to communicate with a connecting interface pipe at the front end of a combustion chamber of the pyrotechnic cutting torch; and a spray hole is provided on a side wall of the nozzle; the plug has a receiving cavity and a communicating port communicating with the receiving cavity; the communicating port is connected to and communicates with an opening at one end of the communication passage away from the connecting interface pipe; the plug is sealingly arranged in the communicating passage and is movable in the communicating passage along the axis of the communicating passage; the communicating passage, the communicating port and the accommodating cavity are all coaxially arranged; when the plug is in a state of blocking the spray hole, the upper end of the plug is located in the communicating passage and the lower end of the plug is located in the communicating port, and the inner diameter of the communicating port is not less than the outer diameter of the plug; the material of the plug is a material that can be melted or vaporized by ablation of a molten jet; and after the plug is ablated by the molten jet, the upper end of the plug is lower than the spray hole.

[0007] Preferably, the plug is provided with a barb groove at one end close to the plug; the accommodating cavity is fixed with a barb buckle at the position of the barb groove; the barb groove can be snapped onto the barb buckle.

[0008] Preferably, the ejection hole includes at least two ejection hole groups, and each ejection hole group is arranged in parallel circumferentially around the axis of the nozzle; the ejection hole group includes multiple injection holes, and each injection hole is arranged in parallel along the axis direction of the nozzle; the center points of any three injection holes in two adjacent ejection hole groups are connected to form an equilateral triangle.

[0009] Preferably, one end of the nozzle is provided with an external thread for threaded connection with the internal thread of the connecting mouthpiece.

[0010] Preferably, an annular limiting ridge is provided inside the connecting channel at one end close to the connecting interface tube; a graphite tube is provided in the connecting channel on the side of the annular limiting ridge close to the connecting interface tube, and the length of the graphite tube is consistent with the length of the external threaded part of the nozzle.

[0011] Preferably, when the plug is in a state of blocking the ejection hole, the outer diameter of one end of the plug is the same as the inner diameter of the corresponding position of the connecting channel, and the outer diameter of the other end of the plug is the same as the inner diameter of the connecting port; at least one first sealing ring groove is provided on the outer side wall of the plug near both ends, and a first sealing ring is provided in the first sealing ring groove.

[0012] Preferably, an annular gap is provided between the outer side wall between the two ends of the plug and the corresponding inner side wall of the communicating channel and part of the inner side wall of the communicating port.

[0013] Preferably, at least one first wrench blind hole is provided on the circumferential outer side wall of the nozzle.

[0014] Preferably, the internal thread provided at one end of the nozzle away from the connection interface pipe is threadedly connected to the external thread provided at the end of the plug; the end of the plug with the external thread is located at the same end as the connecting port; at least one second wrench blind hole is provided on the outer side wall of the plug.

[0015] Preferably, it also includes a sealing ring; the sealing ring is sleeved at the connection between the nozzle and the connecting interface pipe, a first limiting portion is provided on the outer side wall of the nozzle, and a second limiting portion corresponding to the first limiting portion is provided on the connecting interface pipe; the upper end portion of the sealing ring is located in the second limiting portion, and the lower end portion of the sealing ring is located in the first limiting portion; the positions of the nozzle and the connecting interface pipe corresponding to the sealing ring are both provided with at least one second sealing ring groove, and a second sealing ring is provided in the second sealing ring groove.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model provides a drilling nozzle for a pyrotechnic cutting torch, which realizes drilling by arranging a spray hole on the nozzle and cooperating with the injection of a molten jet; a plug that is easily ablated by the molten jet is provided, and relies on the cooperation of the pyrotechnic cutting torch. Before operation, the plug can achieve sealing of the spray hole, and during operation, it can be ablated by the molten jet, and under the pressure of the molten jet, the plug slides toward the side close to the accommodating cavity while abling, thereby realizing rapid opening of the spray hole; the easily ablated plug and the plug also cooperate to form a "molten pool" to prevent combustion products from blocking the spray hole; it can be applied to different types of oilfield operations, can meet various needs including well completion, well repair and logging processes, and provides a solution for drilling operations in different scenarios.

[0018] Furthermore, since a plug of a certain length is used for sealing, when ignition is carried out, the plug is pushed toward the accommodating cavity to cause the jet to be ejected, part of the plug is burned, and part is pushed downward. The barb groove provided therein cooperates with the barb buckle to lock the position of the plug, prevent the plug from rebounding, and ensure the continuity of the flame.

[0019] Furthermore, in order to better punch holes, the ejection holes are arranged to be composed of several ejection holes, and the center points of the three ejection holes of two adjacent ejection hole groups are connected to form an equilateral triangle. The flames ejected from the three adjacent ejection holes can jointly form a conical flame ejection. The use of three ejection holes forming an equilateral triangle can provide a complete ablation surface and avoid dead corners.

[0020] Furthermore, the nozzle is connected to the connecting interface pipe by thread, and its connection structure is simple and convenient.

[0021] Furthermore, the annular limiting ridge can limit the graphite tube and make the graphite tube have a threaded position corresponding to the nozzle. Since the thickness of the threaded part corresponding to the outside of the graphite tube is small, the setting of the graphite tube can reduce the high-temperature jet erosion of the threaded connection to the outside, thereby ensuring the connection strength between the nozzle and the connecting interface tube.

[0022] Furthermore, the plug achieves a sealing effect at both ends by using the first sealing ring and the sealing surface formed with one-to-one corresponding sizes, thereby ensuring good sealing performance.

[0023] Furthermore, an annular gap is provided at the outer side wall and the corresponding position between the two ends of the plug, which can reduce the friction resistance when the plug moves toward the accommodating cavity.

[0024] Furthermore, the first wrench blind hole provided on the nozzle can facilitate the threaded connection between the nozzle and the connecting interface pipe, thereby improving installation efficiency.

[0025] Furthermore, the nozzle and the plug are also connected by threads, which has a simple and convenient structure. The second wrench blind hole provided on the plug facilitates the threaded connection of the plug to the nozzle.

[0026] Furthermore, the provision of the sealing ring in conjunction with the provision of a second sealing ring can enhance the sealing effect of the connection between the nozzle and the connecting interface pipe. 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 following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0028] Figure 1 This is a schematic diagram of the external structure of the perforating nozzle for the pyrotechnic cutting torch provided by the utility model;

[0029] Figure 2 This is a schematic cross-sectional view of a perforated nozzle for a pyrotechnic cutting torch provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the nozzle in the perforated nozzle for the pyrotechnic cutting torch provided by the utility model;

[0031] Figure 4 This is a schematic structural diagram of a plug in a perforated nozzle for a pyrotechnic cutting torch provided by the present invention;

[0032] Figure 5 The utility model is a schematic structural diagram of a plug in a perforated nozzle for a pyrotechnic cutting torch.

[0033] In the picture:

[0034] 100-Punch nozzle for pyrotechnic cutting torch;

[0035] 10-nozzle; 11-connecting channel; 12-spray port group; 121-injection hole; 13-annular limiting ridge; 14-first wrench blind hole; 15-small limiting hole; 16-threaded connection hole;

[0036] 20- plug; 21- barb groove; 22- first sealing ring; 23- annular gap;

[0037] 30-plug; 31-accommodation cavity; 32-communication port; 33-barb buckle; 34-second wrench blind hole; 35-small cylindrical section; 36-annular groove;

[0038] 40-graphite tube;

[0039] 50-connecting interface pipe; 51-second sealing ring;

[0040] 60-Sealing ring. DETAILED DESCRIPTION

[0041] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0042] The purpose of the utility model is to provide a drilling nozzle for a pyrotechnic cutting torch, so as to solve the problems existing in the prior art and to achieve efficient and reliable drilling operation by relying on the pyrotechnic cutting torch.

[0043] 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 implementation methods.

[0044] Example 1

[0045] This embodiment provides a perforating nozzle 100 for a pyrotechnic cutting torch. Figures 1 to 5 As shown, it includes a nozzle 10, a plug 20 and a plug 30; the nozzle 10 has a through-going communication channel 11, one end of which is used to communicate with the connecting interface pipe 50 at the front end of the combustion chamber of the pyrotechnic cutting torch; and a spray hole is provided on the side wall of the nozzle 10; the plug 30 has a receiving cavity 31 and a communicating port 32 communicating with the receiving cavity 31; the communicating port 32 is connected to and communicates with the opening at one end of the communicating channel 11 away from the connecting interface pipe 50; the plug 20 is sealed and arranged in the communicating channel 11, and the plug 20 can It moves along the axis of the communicating channel 11 in the communicating channel 11; the communicating channel 11, the communicating port 32 and the accommodating cavity 31 are all coaxially arranged; when the plug 20 is in a state of blocking the ejection hole, the upper end of the plug 20 is located in the communicating channel 11, and the lower end of the plug 20 is located in the communicating port 32, and the inner diameter of the communicating port 32 is not less than the outer diameter of the plug 20; the material of the plug 20 is a material that can be melted or vaporized by the molten jet; and after the plug 20 is impacted and ablated by the molten jet, the upper end of the plug 20 is lower than the ejection hole.

[0046] By setting an ejection hole on the nozzle 10, drilling is achieved in conjunction with the injection of a molten jet; a plug 20 that is easily ablated by the molten jet is set, and relying on the cooperation of a pyrotechnic cutting torch, the plug 20 can seal the ejection hole before work, and during work, it can be ablated by the molten jet, and under the pressure of the molten jet, the plug 20 slides toward the side close to the accommodating cavity 31 while abling, thereby achieving rapid opening of the ejection hole; the easily ablated plug 20 and the plug 30 also cooperate to form a "molten pool" to prevent combustion products from blocking the ejection hole; it can be applied to different types of oilfield operations, and can meet various needs including completion, well repair and logging processes, providing a solution for drilling operations in different scenarios.

[0047] Among them, other relevant structural descriptions about the nozzle 10 are as follows:

[0048] Specifically, the nozzle 10 is a cylindrical structure with a slightly reduced diameter at the upper end and an external thread threadedly connected to the internal thread of the connecting interface pipe 50. This part is threadedly connected to the inside of the connecting interface pipe 50; a first limiting portion is provided below it, and two second sealing ring grooves are provided on the first limiting portion.

[0049] Among the optional solutions of this embodiment, it is more preferred that Figure 2 and Figure 3 As shown, one end of the nozzle 10 is provided with an external thread for threaded connection with the internal thread of the connecting mouthpiece 50. The nozzle 10 is threadedly connected to the connecting mouthpiece 50, and its connection structure is simple and convenient.

[0050] Among the optional solutions of this embodiment, it is more preferred that Figure 2 As shown, an annular limiting ridge 13 is provided within the communication channel 11 at one end near the connection port 50. A graphite tube 40 is disposed within the communication channel 11 on the side of the annular limiting ridge 13 near the connection port 50. The length of the graphite tube 40 matches the length of the externally threaded portion of the nozzle 10. The annular limiting ridge 13 restrains the graphite tube 40 and aligns it with the threaded portion of the nozzle 10. Because the thickness of the threaded portion of the graphite tube 40 corresponding to the outside is small, the provision of the graphite tube 40 reduces the risk of high-temperature jets eroding the threaded connection, thereby ensuring the strength of the connection between the nozzle 10 and the connection port 50.

[0051] Specifically, the communication channel 11 below the annular limiting ridge 13 forms a close sealing surface corresponding to the upper end of the plug 20; the outer diameter of the communication channel 11 between the two ends of the plug 20 is slightly increased.

[0052] Specifically, a small limiting hole 15 and a threaded connection hole 16 are provided at the lower end of the nozzle 10, and the inner diameter of the small limiting hole 15 is smaller than the inner diameter of the threaded connection hole 16; an internal thread for threaded connection with the plug 30 is provided on the inner side wall of the threaded connection hole 16; a protruding ring is provided at the position of the plug 30 corresponding to the small limiting hole 15, and the protruding ring is located in the small limiting hole 15.

[0053] Specifically, the graphite tube 40 is inserted from the upper end of the nozzle 10 , and the bottom end thereof abuts against the limiting ridge.

[0054] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 3 As shown, the ejection holes include at least two ejection hole groups 12, each of which is arranged circumferentially and in parallel around the axis of the nozzle 10. The ejection hole groups 12 include multiple injection holes 121, each of which is arranged parallel to the axis of the nozzle 10. The center points of any three injection holes 121 in two adjacent ejection hole groups 12 are connected to form an equilateral triangle. To facilitate drilling, the ejection holes are arranged to form an equilateral triangle consisting of multiple injection holes 121. The center points of the three injection holes 121 in two adjacent ejection hole groups 12 are connected to form an equilateral triangle. The flames ejected from these three adjacent injection holes 121 can form a cone-shaped flame. The use of three injection holes 121 forming an equilateral triangle can provide a complete ablation surface, avoiding blind spots.

[0055] Specifically, the inner diameter of the injection hole 121 is 5 mm to 10 mm; each nozzle group 12 includes 2 to 5 injection holes 121; the margin between two adjacent injection holes 121 is 1 mm to 3 mm; the injection holes 121 of two adjacent nozzle groups 12 are staggered in sequence in the axial direction of the nozzle 10, that is, the line connecting the center points of any three injection holes 121 of two adjacent nozzle groups 12 forms an equilateral triangle with a side length of 6 mm to 13 mm.

[0056] Among the optional solutions of this embodiment, it is more preferred that Figure 1 、 Figure 2 and Figure 3 As shown, at least one first blind wrench hole 14 is provided on the circumferential outer side wall of the nozzle 10. The first blind wrench hole 14 provided on the nozzle 10 facilitates the threaded connection between the nozzle 10 and the connecting mouthpiece 50, thereby improving installation efficiency.

[0057] Specifically, the number of the first wrench blind holes 14 can be set according to actual needs, such as being set to 4, which are evenly distributed on the outer wall of the nozzle 10 in the circumferential direction.

[0058] Among them, other relevant structural descriptions about the plug 30 are as follows:

[0059] Among the optional solutions of this embodiment, it is more preferred that Figure 1 、 Figure 2 and Figure 4 As shown, the internal threads on the end of the nozzle 10 away from the connection mouthpiece 50 are threadedly connected to the external threads on the end of the plug 30; the externally threaded end of the plug 30 is located at the same end as the communication port 32; and at least one second blind wrench hole 34 is provided on the outer wall of the plug 30. The nozzle 10 and the plug 30 are also threadedly connected, which is simple and convenient. The second blind wrench hole 34 on the plug 30 facilitates the threaded connection of the plug 30 to the nozzle 10.

[0060] Specifically, the number of the second wrench blind holes 34 can be set according to actual needs, such as 4, which are evenly distributed circumferentially around the axis of the plug 30.

[0061] Specifically, the plug 30 is a cylindrical structure with one end closed, and a stepped shaft is provided at the upper end, which is first small and then large. Each stepped shaft corresponds to the small limit hole 15 and the threaded connection hole 16 of the nozzle 10 from top to bottom; the lower end of the plug 30 transitions to the small cylindrical section 35 through a conical surface (specifically, the transition cone angle is 30°~60°), and an annular groove 36 is opened in the middle of the small cylindrical section 35 for connecting the measuring instrument below.

[0062] Specifically, the inner diameter of the upper connecting port 32 of the plug 30 is equivalent to the outer diameter of the end of the plug 20 , and together they constitute the sealing surface of the lower end of the plug 20 . The inner diameter of the accommodating cavity 31 of the plug 30 is slightly larger than the inner diameter of the connecting port 32 .

[0063] Specifically, the distance from the bottom of the lowest injection hole 121 of the nozzle 10 to the inner bottom surface of the plug 30 is slightly greater than the length of the plug 20 by 20 mm to 30 mm, which facilitates the formation of a "molten pool" and prevents the combustion products of the ignition agent from blocking the injection hole 121.

[0064] Among them, other relevant structural descriptions about the plug 20 are as follows:

[0065] Among the optional solutions of this embodiment, it is more preferred that Figure 2 and Figure 5 As shown, the end of the plug 20 near the plug 30 is provided with a barb groove 21; the accommodating cavity 31 is fixedly provided with a barb buckle 33 in the position of the barb groove 21; the barb groove 21 can be snapped onto the barb buckle 33. Because the plug 20 is of a certain length for sealing, when ignition is carried out, the plug 20 is pushed toward the accommodating cavity 31, causing the jet to be ejected. Part of the plug 20 is ablated, and part is pushed downward. The barb groove 21 and the barb buckle 33 can lock the position of the plug 20, preventing the plug 20 from rebounding and ensuring the continuity of the flame.

[0066] Among the optional solutions of this embodiment, it is more preferred that Figure 2As shown, when the plug 20 is blocking the ejection hole, the outer diameter of one end of the plug 20 is the same as the inner diameter of the corresponding position of the communication channel 11, and the outer diameter of the other end of the plug 20 is the same as the inner diameter of the communication opening 32. At least one first sealing ring groove is provided on the outer wall of the plug 20 near both ends, and a first sealing ring 22 is disposed in the first sealing ring groove. The first sealing ring 22 and the corresponding sealing surface form a sealing effect at both ends of the plug 20, ensuring good sealing performance.

[0067] Among the optional solutions of this embodiment, it is more preferred that Figure 2 As shown, an annular gap 23 is formed between the outer wall between the two ends of the plug 20 and the corresponding inner wall of the communication channel 11 and a portion of the inner wall of the communication opening 32. The annular gap 23 is provided between the outer wall between the two ends of the plug 20 and the corresponding position, which can reduce the friction resistance when the plug 20 moves into the accommodating cavity 31.

[0068] Specifically, the plug 20 is a rod-shaped structure with thicker ends and slightly thinner in the middle, with adjacent portions transitioned by chamfers, and two first sealing ring grooves are respectively provided on the side walls of the two thicker ends.

[0069] Specifically, the plug 20 is fed into the nozzle 10 from the lower end, and its top end surface abuts against the annular ridge in the nozzle 10 and forms a sealing surface together with the side wall of the communication channel 11 below.

[0070] Specifically, the length of the annular gap 23 of the plug 20 in the axial direction of the nozzle 10 is greater than the length of the ejection hole in the axial direction of the nozzle 10, that is, the plug 20 is ensured to cover each ejection hole 121 in the axial direction of the nozzle 10 to ensure the sealing effect.

[0071] Specifically, the plug 20 is made of aluminum alloy, copper alloy, polyetheretherketone (PEEK), or other materials with low melting points, easy ablation, easy melting, or easy vaporization properties.

[0072] Among them, regarding other related instructions:

[0073] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2As shown, the nozzle 10 and the connecting pipe 50 also include a sealing ring 60. The sealing ring 60 is mounted on the outer wall of the nozzle 10 and the connecting pipe 50. A first stopper is provided on the outer wall of the nozzle 10, and a second stopper corresponding to the first stopper is provided on the connecting pipe 50. The upper end of the sealing ring 60 is located within the second stopper, and the lower end of the sealing ring 60 is located within the first stopper. The nozzle 10 and the connecting pipe 50 are both provided with at least one second sealing ring groove corresponding to the sealing ring 60, and the second sealing ring 51 is provided in the second sealing ring groove. The provision of the sealing ring 60 and the provision of the second sealing ring 51 can enhance the sealing effect at the connection between the nozzle 10 and the connecting pipe 50.

[0074] Specifically, the first limiting portion and the second limiting portion are both formed by reducing their diameters, and the first limiting portion and the second limiting portion together form a complete limiting ring groove.

[0075] Specifically, both the first sealing ring 22 and the second sealing ring 51 can be O-rings.

[0076] Specifically, before operation, the plug 20 and the two sealing surfaces of the nozzle 10 and the plug 30 isolate the interior from the downhole environment, effectively maintaining the pressure balance inside the cutting tool. During operation, the plug 20 is under the combined action of the jet pressure and ablation to quickly expose the injection hole 121 and form a "molten pool" in time, and the molten metal jet is ejected from the injection hole 121 to achieve drilling.

[0077] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A perforating nozzle for a pyrotechnic cutting torch, characterized by: Includes nozzles, plugs and stoppers; The nozzle has a through-going communication passage, one end of which is used to communicate with the connecting interface pipe at the front end of the combustion chamber of the pyrotechnic cutting torch; and a spray hole is provided on the side wall of the nozzle; The plug has an accommodating cavity and a communication port communicating with the accommodating cavity; the communication port is connected to and communicates with an opening at one end of the communication channel away from the connection interface pipe; The plug is sealed and disposed in the communication channel, and the plug is movable in the communication channel along the axis of the communication channel; The communication channel, the communication port, and the accommodating cavity are all coaxially arranged; when the plug is in a state of blocking the ejection hole, the upper end of the plug is located in the communication channel, and the lower end of the plug is located in the communication port, and the inner diameter of the communication port is not less than the outer diameter of the plug; The material of the plug is a material that can be melted or vaporized by a molten jet ablation; After the plug is impacted and ablated by the molten jet, the upper end of the plug is lower than the ejection hole.

2. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: The end of the plug close to the plug head is provided with a barb groove; the accommodating cavity is fixed with a barb buckle at the position of the barb groove; the barb groove can be snapped onto the barb buckle.

3. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: The ejection hole comprises at least two ejection hole groups, each of which is arranged in parallel circumferentially around the axis of the nozzle; the ejection hole group comprises a plurality of ejection holes, each of which is arranged in parallel along the axis of the nozzle; A line connecting the center points of any three injection holes in two adjacent injection port groups forms an equilateral triangle.

4. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: One end of the nozzle is provided with an external thread for threaded connection with the internal thread of the connecting mouthpiece.

5. The perforating nozzle for a pyrotechnic cutting torch according to claim 4, characterized in that: An annular limiting ridge is provided inside one end of the communication channel close to the connection interface pipe; A graphite tube is provided in the communicating channel on one side of the annular limiting ridge close to the connecting interface pipe, and the length of the graphite tube is consistent with the length of the external threaded portion of the nozzle.

6. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: When the plug is in a state of blocking the ejection hole, the outer diameter of one end of the plug is the same as the inner diameter of the corresponding position of the communication channel, and the outer diameter of the other end of the plug is the same as the inner diameter of the communication port; At least one first sealing ring groove is provided on the outer side walls of the stopper near both ends, and a first sealing ring is provided in the first sealing ring groove.

7. The perforating nozzle for a pyrotechnic cutting torch according to claim 6, characterized in that: An annular gap is formed between the outer side wall between the two ends of the plug and the corresponding inner side wall of the communicating channel and part of the inner side wall of the communicating port.

8. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: At least one first wrench blind hole is provided on the circumferential outer side wall of the nozzle.

9. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: The internal thread provided on the end of the nozzle away from the connection mouthpiece is threadedly connected to the external thread provided on the end of the plug; One end of the plug having an external thread is located at the same end as the communication port; At least one second wrench blind hole is provided on the outer side wall of the plug.

10. The perforating nozzle for a pyrotechnic cutting torch according to claim 1, characterized in that: Also included is a sealing ring; The sealing ring is sleeved at the connection between the nozzle and the connecting interface pipe, a first limiting portion is provided on the outer wall of the nozzle, and a second limiting portion corresponding to the first limiting portion is provided on the connecting interface pipe; The upper end portion of the sealing ring is located in the second limiting portion, and the lower end portion of the sealing ring is located in the first limiting portion; At least one second sealing ring groove is provided at the position of the nozzle and the connecting interface pipe corresponding to the sealing ring, and a second sealing ring is provided in the second sealing ring groove.

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