IL300343A - Device for cutting a tubular structure - Google Patents
Device for cutting a tubular structureInfo
- Publication number
- IL300343A IL300343A IL300343A IL30034323A IL300343A IL 300343 A IL300343 A IL 300343A IL 300343 A IL300343 A IL 300343A IL 30034323 A IL30034323 A IL 30034323A IL 300343 A IL300343 A IL 300343A
- Authority
- IL
- Israel
- Prior art keywords
- pyrotechnic charge
- pyrotechnic
- projection part
- cutting device
- cutting
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims description 29
- 229910052751 metal Inorganic materials 0.000 claims description 16
- 239000002184 metal Substances 0.000 claims description 16
- 230000005540 biological transmission Effects 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 7
- 238000000926 separation method Methods 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 claims description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052709 silver Inorganic materials 0.000 claims description 3
- 239000004332 silver Substances 0.000 claims description 3
- 229910052718 tin Inorganic materials 0.000 claims description 3
- 239000011135 tin Substances 0.000 claims description 3
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052721 tungsten Inorganic materials 0.000 claims description 3
- 239000010937 tungsten Substances 0.000 claims description 3
- YSIBQULRFXITSW-OWOJBTEDSA-N 1,3,5-trinitro-2-[(e)-2-(2,4,6-trinitrophenyl)ethenyl]benzene Chemical compound [O-][N+](=O)C1=CC([N+](=O)[O-])=CC([N+]([O-])=O)=C1\C=C\C1=C([N+]([O-])=O)C=C([N+]([O-])=O)C=C1[N+]([O-])=O YSIBQULRFXITSW-OWOJBTEDSA-N 0.000 description 4
- 239000000028 HMX Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005474 detonation Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 4
- UZGLIIJVICEWHF-UHFFFAOYSA-N octogen Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)CN([N+]([O-])=O)C1 UZGLIIJVICEWHF-UHFFFAOYSA-N 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000002131 composite material Substances 0.000 description 3
- 230000000977 initiatory effect Effects 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- XTFIVUDBNACUBN-UHFFFAOYSA-N 1,3,5-trinitro-1,3,5-triazinane Chemical compound [O-][N+](=O)N1CN([N+]([O-])=O)CN([N+]([O-])=O)C1 XTFIVUDBNACUBN-UHFFFAOYSA-N 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 239000004106 carminic acid Substances 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B1/00—Explosive charges characterised by form or shape but not dependent on shape of container
- F42B1/02—Shaped or hollow charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D3/00—Particular applications of blasting techniques
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
- Sawing (AREA)
- Air Bags (AREA)
Description
Technical field The present invention relates to a device for cutting a tubular structure.
Prior art Devices for cutting tubular structures are in particular used in the oil industry (cutting of drill tubes or pipelines) or in the space domain (launcher separation).
To date, there are different solutions for cutting a tubular structure. The present invention relates to cutting devices which are integrated inside the tubular structure and which use a pyrotechnic charge for cutting the structure on command.
Document FR 2 491 387 discloses a pyrotechnic device for sectioning ducts. The device described in this document comprises a cylindrical body which contains a pyrotechnic charge, the body further being provided with ejection nozzles to direct the jet of reaction products after the ignition of the pyrotechnic charge. The device is placed in a duct at a location corresponding to that where the separation is to be carried out. The combustion products ejected by the nozzles hit the inner face of the duct and cut it in a plane transverse to its axis.
However, such a device has several drawbacks. The device described in the document FR 2 491 387 presents in particular a large overall dimension and a high mass, particularly because of the amount of pyrotechnic charge used. This type of device cannot be integrated into any type of tubular structure, particularly into launchers. Furthermore, the cutting is carried out by hot gases resulting from the combustion of the pyrotechnic charge. Consequently, depending on the thickness and/or the material of the wall to be cut, the cutting may take time, or even be incomplete, which is not compatible with instantaneous separation needs such as in the space domain or in the military.
Disclosure of the invention The aim of the invention is to propose a compact cutting device that ensures a reliable and instantaneous cutting of a tubular structure. This aim is achieved in particular thanks to a device for cutting a tubular structure comprising: - a base intended to be fixed inside a tubular structure, - a cover fixed on the base, - the base and the cover delimiting therebetween a blind inner peripheral housing, - a pyrotechnic charge extending in the blind inner peripheral housing and having an outer peripheral surface, - a projection part covering all or part of the outer peripheral surface of the pyrotechnic charge, - at least one pyrotechnic transmission line connected to the pyrotechnic charge.
By associating a metal part with a pyrotechnic charge, the cutting device of the invention allows forming, after ignition of the pyrotechnic charge, a metal jet which is projected at high speed towards the outside of the device. The device of the invention thus ensures a very effective cut of any structure present in the vicinity of the device, and this instantaneously. Furthermore, by disposing the pyrotechnic charge in a peripheral housing, its integration is optimized, which allows obtaining a very compact cutting device.
According to one particular characteristic of the cutting device of the invention, the pyrotechnic charge is formed of a plurality of adjacent unit blocks made of pyrotechnic material. The use of unit blocks facilitates their monitoring as well as the formation of the pyrotechnic charge in the blind inner peripheral housing, in particular by allowing adapting to different housing geometries. Furthermore, a pyrotechnic charge formed of unit blocks facilitates the mounting of the projection part in the cutting device, particularly when it is not segmented.
According to another particular characteristic of the cutting device of the invention, the outer peripheral surface of the pyrotechnic charge and the projection part have a dihedral profile. This shape allows better monitoring the projection of the material (metal) jet on the structure to be cut.
According to another particular characteristic of the cutting device of the invention, the latter comprises at least one inner groove connecting the center of the device with the blind inner peripheral housing, a pyrotechnic device (transmission line or charge) being present in said at least one groove in order to initiate the main charge ensuring the projection of the metal jet.
According to another particular characteristic of the cutting device of the invention, the projection part can be made of a metal material, preferably having a high density, chosen among: copper, silver, tin, tungsten, aluminum, or a composite material (plastic) filled with a metal powder.
According to another particular characteristic of the cutting device of the invention, the projection part has a thickness comprised between 0.1 mm and 3 mm.
According to another particular characteristic of the cutting device of the invention, the base comprises a bottom and an enclosure vertically extending from the bottom and surrounding the pyrotechnic charge, the cover sealingly closing the upper portion of the enclosure so as to contain the pyrotechnic charge inside the cutting device. The pyrotechnic charge is thus protected from the external environment, which particularly allows avoiding the formation of condensation, humidity or ice on the charge, which may degrade the cutting performance of the device.
According to another particular characteristic of the cutting device of the invention, the enclosure has a reduced thickness portion facing the metal projection part. This facilitates the projection of material (metal) towards the structure to be cut during the operation of the cutting device.
The invention also relates to a tubular structure comprising a wall delimiting an internal volume, the structure comprising at least one cutting device according to the invention, the separation device being fixed in the internal volume.
Brief description of the drawings [Fig. 1] Figure 1 is a schematic exploded perspective view of a cutting device in accordance with one embodiment of the invention, [Fig. 2] Figure 2 is a schematic sectional view of a tubular structure in which the cutting device of Figure 1 is fixed, [Fig. 3] Figure 3 is a schematic sectional view of the cutting device of Figure 2, [Fig. 4] Figure 4 is a schematic sectional view of the cutting device of Figure 2 before detonation, [Fig. 5] Figure 5 is a schematic sectional view of the cutting device of Figure 2 after detonation and ignition of the pyrotechnic charge.
Description of the embodiments Figure 1 shows a cutting device 100 in accordance with one embodiment. The cutting device 100 comprises a base 110, a cover 120, a pyrotechnic charge 130, a pyrotechnic transmission line 140 and a projection part 150. The base 110 includes a bottom 111 and an enclosure 112 delimiting the outer periphery of the cutting device 100. The enclosure 112 includes on its external surface lugs 113 which extend outwards and which are intended to allow the fixing of the cutting device at a determined position in a tubular structure to be cut. In the example described here, the lugs 113 cooperate with fixing tabs 12 secured to a tubular structure 10 to be cut (Figure 2). Other fixing means than lugs can of course be envisaged for fixing the cutting device of the invention in a tubular structure.
The cover 120 is fixed on the base 110 by means of screws 170 which cooperate with tappings 141 formed in the bottom 111 of the base 110. Again, the screws 1and the tappings 141 are only one example of fixing means and other fixing/clamping means can of course be used to fix the cover 120 on the base 110. In the example described here, washers 142 are further used to reinforce the sealing between the base and the cover at their connection points. A positioning pin 143 is also used here to facilitate the positioning between the cover and the base.
Once assembled together, the base 110 and the cover 120 delimit therebetween a blind inner peripheral housing 160 (Figure 3). In the example described here, the blind inner peripheral housing 160 is formed by shoulders 115 and 121 present respectively in the base 110 and the cover 120. According to variants, the blind inner peripheral housing is formed by a shoulder present only in the base or in the cover, the cover or the base closing the low or top portion of the housing in this case.
The blind inner peripheral housing 160 is intended to receive the pyrotechnic charge 130. The pyrotechnic charge has a shape corresponding to that of the housing 160.
The pyrotechnic charge 130 has an inner peripheral surface 130b in contact with the housing 160 and an outer peripheral surface 130a.
The projection part 150 has an inner peripheral surface 150b in contact with the outer peripheral surface 130a of the pyrotechnic charge. In the example described here, the projection part covers the entire outer peripheral surface 130a.
The projection part 150 is preferably made of metal material and has a shape corresponding at least partly to the shape of the outer peripheral surface of the pyrotechnic charge in order to better monitoring the high–speed projection of the metal during the combustion of the pyrotechnic charge.
In the example described here, the outer peripheral surface 130a of the pyrotechnic charge 130 has a dihedral profile (Figure 3). Likewise, the projection part 150 has a corresponding dihedral profile so that the inner peripheral surface 150b matches the shape of the outer peripheral surface 130a of the pyrotechnic charge.
Other shapes having a profile turned towards the outside of the cutting device can of course be envisaged.
The metal material or the metal filler of the composite used for the projection part is preferably a material having good ductility and a high volume mass or density. The material or the metal filler can be chosen in particular among: copper, silver, tin, tungsten and aluminum.
The projection part has a thickness preferably comprised between 0.1 mm and mm.
The pyrotechnic charge 130 is preferably formed of a plurality of adjacent unit blocks 131 as in the example described here. The use of unit blocks facilitates the formation of the pyrotechnic charge in the blind inner peripheral housing and consequently the manufacture and monitoring of the cutting device. A pyrotechnic charge formed of unit blocks particularly facilitates the mounting of the projection part in the cutting device because the latter is preferably not segmented. The pyrotechnic charge can be made from pulverulent (powder), granular or composite materials (mixture with a binder) using energy substances such as cyclotrimethylenetrinitramine (RDX), octogen (HMX), hexanitrostilbene (HNS).
The cutting device 100 also comprises a pyrotechnic transmission line 1connected, on the one hand, to a primer 125 and, on the other hand, to the pyrotechnic charge 130. More specifically, in the example described here, the pyrotechnic transmission line 140 is housed in half–grooves 114 and 124 present respectively in the base 110 and the cover 120, the half–grooves 114 and 1forming a groove inside the cutting device which extends here on the entire diameter of the cutting device 100 so as to form two diametrically opposite points of initiation of the pyrotechnic charge 130.
According to variants, the pyrotechnic transmission line can be housed in a groove extending in a single direction from the primer, the line forming in this case a single initiation point, or be housed in several grooves extending in several directions from the primer, the line forming in this case as many points of initiation of the pyrotechnic charge as different directions from the primer.
The pyrotechnic transmission line 140 is here formed of a plurality of cylindrical unit blocks 141 which are placed against each other so as to form a detonating cord or a detonating transmission charge using energy substances such as cyclotrimethylenetrinitramine (RDX), octogen (HMX) or hexanitrostilbene (HNS).
The cutting device of the invention is preferably designed so as to isolate the pyrotechnic charge from the external environment in order to avoid in particular the formation of condensation or ice in contact with the charge that could reduce the cutting performance. In the example described here, the base and the cover together form a sealed casing for the pyrotechnic charge. More specifically, the base 1comprises an enclosure 112 which extends from the bottom 111 and which surrounds the pyrotechnic charge 130. The cover 120 sealingly closes the upper portion of the enclosure 112 so as to contain the pyrotechnic charge 130 inside the cutting device 100 (Figure 3). In order to reinforce the sealing, the cutting device 1comprises a seal 123 intended to be housed in a groove 122 present on the periphery of the cover 120 allowing a sealed closure of the base 110 by the cover 120. As already indicated, washers 142 can also be used to reinforce the sealing between the base and the cover at their connection points by the screws 170.
A portion 1120 of the enclosure 112 located facing the metal projection part preferably has a thickness smaller than the other portions of the enclosure so as not to interfere with the projection of metal during the operation of the cutting device (Figure 3). For example, the portion 1120 can be made of aluminum and have a thickness E1120 of about 0.2 mm, while the rest of the enclosure 120 has a thickness E120 of about 5 mm for ensuring good rigidity and lightness of the part.
In the example described here, the insulation of the pyrotechnic charge is further reinforced by the projection part 150 which covers its outer peripheral surface 130a.
The operation of the cutting device 100 will now be explained. As illustrated in Figure 2, the cutting device 100 is fixed in the internal volume 13 of a tubular structure 10, here by the lugs 113 which cooperate with fixing tabs 12 secured to a tubular structure 10 to be cut. The cutting device 100 is placed perpendicularly to the axis X of the tubular structure 10 so as to position the outer periphery of the device and, consequently, the pyrotechnic charge 130 and the projection part 150 facing the inner surface 11a of the wall 11 of the structure 10 (Figure 4). The primer 125 is connected to a detonator embedded in the structure 10 (not represented in Figures 2, 4 and 5). In response to a cutting command, the detonator acts on the primer 125, for example with a mechanical shock or an electrical signal, in order to start the explosive process. The primer 125 then transmits a detonation to the pyrotechnic transmission line 140 which itself transmits a detonation to the pyrotechnic charge 130. Once the pyrotechnic charge 130 has been ignited, the projection part 150 is projected at very high speed in the form of a metal jet 180 in the direction of the wall of the tubular structure 10 after having broken the reduced thickness portion 11of the enclosure 112. The metal jet 180 then passes through the wall 11 thus ensuring the cutting of the tubular structure 10 as illustrated in Figure 5.
The presence of the primer 125 is not essential. In other embodiments, the pyrotechnic transmission line can be directly connected to a detonator or initiator embedded in the tubular structure.
In the example described above, the tubular structure has a circular shape in section while the cutting device also has a circular shape. By "tubular structure", is meant here any hollow structure delimited by a wall to be cut, the structure being in particular able to present in section an oval, square, rectangular shape, etc. The geometry of the cutting device can be easily adapted to present corresponding oval, square, rectangular shapes, etc. so that the cutting device of the invention is not limited to a circular shape.
The cutting device of the invention is particularly, but not exclusively, suitable for the cutting of ducts, for example in the oil industry, for the separation of stages or the controlled destruction of a propellant in the space domain, or even for the neutralization of arming devices.
Claims (6)
1.[Claim 1] A device for cutting (100) a tubular structure (10) comprising: - a base (110) intended to be fixed inside a tubular structure, - a cover (120) fixed on the base,- the base and the cover delimiting therebetween a blind inner peripheral housing (160),- a pyrotechnic charge (130) extending in the blind inner peripheral housing (160) and having an outer peripheral surface (130a),- a projection part (150) covering all or part of the outer peripheral surface (130a) of the pyrotechnic charge (130),- at least one pyrotechnic transmission line (140) connected to the pyrotechnic charge (130),characterized in that the outer peripheral surface of the pyrotechnic charge (130a) and the projection part (150) have a concave dihedral profile.
2.[Claim 2] The device according to claim 1, wherein the pyrotechnic charge (130) is formed of a plurality of adjacent unit blocks (131) made of pyrotechnic material.
3.[Claim 3] The device according to claim 1 or 2, comprising at least one inner groove connecting the center of the device with the blind inner peripheral housing (160), a pyrotechnic transmission line (140) being present in said at least one groove.
4.[Claim 4] The device according to any one of claims 1 to 3, wherein the projection part (150) is made of a metal material chosen among: copper, silver, tin, tungsten and aluminum.
5.[Claim 5] The device according to claim 4, wherein the metal projection part (150) has a thickness comprised between 0.1 mm and 3 mm.
6.[Claim 6] The device according to any one of claims 1 to 5, wherein the base (110) comprises a bottom (111) and an enclosure (112) vertically extending from the bottom and surrounding the pyrotechnic charge (130), the cover (120) sealingly closing the upper portion of the enclosure (112) so as to contain the pyrotechnic charge inside the cutting device (100).[Claim ?]The device according to claim 6, wherein the enclosure (112) has a reduced thickness portion (1120) facing the metal projection part (150).[Claim 8] A tubular structure (10) comprising a wall (11) delimiting an internal volume (13), the structure comprising at least one cutting device (100) according to any one of claims 1 to 7, the separation device being fixed in the internal volume.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR2008300A FR3113256B1 (en) | 2020-08-05 | 2020-08-05 | Device for cutting a tubular structure |
| PCT/FR2021/051447 WO2022029391A1 (en) | 2020-08-05 | 2021-08-05 | Device for cutting a tubular structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| IL300343A true IL300343A (en) | 2023-04-01 |
Family
ID=74553877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| IL300343A IL300343A (en) | 2020-08-05 | 2021-08-05 | Device for cutting a tubular structure |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4193118A1 (en) |
| FR (1) | FR3113256B1 (en) |
| IL (1) | IL300343A (en) |
| WO (1) | WO2022029391A1 (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4724105A (en) * | 1980-03-18 | 1988-02-09 | Pengo Industries, Inc. | Apparatus for cutting pipe and method pertaining thereto |
| US4352397A (en) | 1980-10-03 | 1982-10-05 | Jet Research Center, Inc. | Methods, apparatus and pyrotechnic compositions for severing conduits |
| DE8700717U1 (en) * | 1987-01-16 | 1987-09-17 | Battelle-Institut eV, 6000 Frankfurt | Device for explosively separating a thick-walled steel pipe |
| US6644099B2 (en) * | 2001-12-14 | 2003-11-11 | Specialty Completion Products | Shaped charge tubing cutter performance test apparatus and method |
| US9574416B2 (en) * | 2014-11-10 | 2017-02-21 | Wright's Well Control Services, Llc | Explosive tubular cutter and devices usable therewith |
-
2020
- 2020-08-05 FR FR2008300A patent/FR3113256B1/en active Active
-
2021
- 2021-08-05 WO PCT/FR2021/051447 patent/WO2022029391A1/en active Application Filing
- 2021-08-05 EP EP21762754.6A patent/EP4193118A1/en active Pending
- 2021-08-05 IL IL300343A patent/IL300343A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| EP4193118A1 (en) | 2023-06-14 |
| FR3113256A1 (en) | 2022-02-11 |
| WO2022029391A1 (en) | 2022-02-10 |
| FR3113256B1 (en) | 2023-04-28 |
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