WO1992000498A1 - Piezoelectrical igniter - Google Patents
Piezoelectrical igniter Download PDFInfo
- Publication number
- WO1992000498A1 WO1992000498A1 PCT/SE1991/000443 SE9100443W WO9200498A1 WO 1992000498 A1 WO1992000498 A1 WO 1992000498A1 SE 9100443 W SE9100443 W SE 9100443W WO 9200498 A1 WO9200498 A1 WO 9200498A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- piezoelectric crystal
- detonator
- fuse
- explosive substance
- detonating
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42D—BLASTING
- F42D1/00—Blasting methods or apparatus, e.g. loading or tamping
- F42D1/04—Arrangements for ignition
- F42D1/045—Arrangements for electric ignition
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
- F42C11/00—Electric fuzes
- F42C11/02—Electric fuzes with piezo-crystal
Definitions
- the present invention refers to a time-delay detonator of explosive
- explosive substance detonator for the entire detonator ready to be used with its built-in auxiliary system in the form of a piezoelectric crystal, capacitor, electronic time-delay, as well as fuse igniter, whereby the last term, fuse igniter, only refers to the detonator part itself in the form of, e.g., a fuse head or a thin-film detonator with an intensification charge.
- Swedish Patent 8703157-1 (PCT/SE88/00409) describes a new interferencesuppressing ignition system protected against outside influence in the form of a explosive substance detonator. It contains a. fuse igniter of a per se known type connected with an electronic time-delayed detonator, which in turn is connected with a transmitter that can convert energy generated during a detonation or, alternatively, another pyrotechnical combustion in the absolute proximity of the transmitter to an electrical current pulse strong enough to trigger the electronic time-delay detonator.
- One type of transmitter with the ability to generate the necessary current pulse from a detonation or the like suggested in the patent is a piezoelectric crystal providing a current pulse when it is influenced by a detonating fuse in its absolute proximity which is sufficient to charge the capacitor that in turn triggers the electronic time detonator with its time-delay adjusted in advance, whereupon the latter triggers the fuse igniter connected therewith and thus also the main charge.
- the safety requirements for explosive substance detonators are generally very high. Before introducing a new explosive substance detonator, one has to be certain that 1t cannot be accidentally triggerd through external influence. This applies not least for explosive substance detonators for interval blasting, where the charges are often very large.
- the present invention refers to a design of that part of the detonator, where the piezoelectric crystal generating the ignition pulse is located, providing maximum protection against accidental triggering, at the same time as it ensures the function of the piezoelectric crystal by forming a stable anvil between which and the detonating ignition fuse the piezoelectric crystal is compressed.
- the device according to the invention can thus be defined as an explosive substance detonator consisting of a piezoelectric crystal electrically connected to a fuse igniter that, during the triggering of the explosive substance detonator, is intended to be affected by the shock wave from a detonating charge or a pyrotechnical composition such as a low energy fuse or the like, so that it will emit a current pulse large enough to trigger the fuse igniter after potential intensification via a capacitor inserted between the piezoelectric crystal and the fuse igniter, which via a potential intensification charge or detonator in its turn triggers the main charge.
- the piezoelectric crystal is surrounded by a strong casing or shell through which a channel proceeds through which the shock wave from the detonating charge or the pyrotechnic composition can reach the piezoelectric crystal.
- the detonating composition thereby consists of a detonating fuse of, e.g., the low-energy type, the channel may continue through whereby the detonating fuse may proceed through several explosive substance detonators and thereby form the connecting link between these.
- the abovementioned casing or shell preferably consists of a piece of a tube consisting of metal or some other hard material a part of whose inside functions as an anvil or counter-support for one of the longer sides of the piezoelectric crystal, while between the other long side of the piezoelectric crystal and the corresponding inside of the tube, the actual channel proceeds.
- an intermediate anvil of metal or some other hard material with a circular-segment-shaped cross section is placed between the inside of the tube and the piezoelectric crystal and whose bulging side is in direct contact with the inside of the tube, while the piezoelectric crystal with one of its long sides is in direct contact with the flush side of the intermediate anvil.
- the remaining space in the protective tube next to the other long side of the piezoelectric crystal may be filled by an intermediate part consisting of, e.g., polycarbonate plastic and through this intermediate part the channel for the detonating low-energy fuse proceeds.
- the channel, for its part may be lined with a thin metal tube.
- the piezoelectric crystal will be surrounded by a forceful cover protecting it from any influence apart from the one intended, i.e., the compression of the crystal that can be effected during a detonation inside the protective tube.
- other components contained in the explosive substance detonator e.g., its capacitor, the time-delay circuit connected with the capacitor, as well as the fuse igniter are effectively protected against the influence of the detonation.
- the tube functions as a counter support, and an anvil against the shock wave is thereby obtained through actual compression of the piezoelectric crystal and the current pulse thereby generated.
- Suitable material for the protective tube is steel or some other metal or other rigid material, whereas the explosive substance detonator is cast or welded integrally into a plastic shell.
- Figures 1 and 2 show sectional front and side views of the explosive substance detonator according to the invention. It consists of an outer shell 1, a protective tube of steel or some other solid material 2, an anvil 3, a piezoelectric crystal 8, a fill-in part in this case consisting of
- polycarbonate plastic 4 provided with a through-channel 5 for a detonating low-energy fuse 6 (shown in Fig. 2).
- the channel 5 is lined on the inside with a thin slightly deformable metal tube 7.
- the latter is normally included in order to make it easy to manufacture hermetically sealed explosive substance detonators.
- the fill-in part 4 may be manufactured of any suitable material allowing a sufficiently large part of the shock wave from the detonating low-energy fuse to reach the piezoelectric crystal 8 in order for it to sufficiently compress, so that it may produce the desired current pulse.
- the piezoelectric crystal 8 is connected via two electric conductors 9 and 10 to a capacitor 11 which in turn is connected to an electronic time-delay detonator 12 via the electric conductors 13 and 14. Moreover, a fuse head 17 placed in direct contact with an intensification charge 18 is connected to the electronic time-delay detonator 12 via two conductors 15 and 16.
- the shock wave travels through the fill-in part 4 and compresses the piezoelectric crystal 8 against the anvil 3 whereby a current pulse proceeds through the cables 9 and 10 charging the capacitor 11 which discharges over the electronic time detonator 12 that after an adjusted interval triggers the fuse head 17 and the charge 18, whereby the main charge is detonated.
- the steel pipe 2 protects the piezoelectric crystal 8 against any other influences even those that in reality result in the shell of the explosive substance detonator 1 will being destroyed.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Air Bags (AREA)
- Fuel-Injection Apparatus (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
- Inorganic Insulating Materials (AREA)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91912879A EP0505513B1 (en) | 1990-07-02 | 1991-06-20 | Piezoelectrical igniter |
DE69106341T DE69106341T2 (de) | 1990-07-02 | 1991-06-20 | Piezoelektrischer zünder. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9002305A SE467597B (sv) | 1990-07-02 | 1990-07-02 | Piezoelektrisk taendare |
SE9002305-2 | 1990-07-02 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992000498A1 true WO1992000498A1 (en) | 1992-01-09 |
Family
ID=20379909
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1991/000443 WO1992000498A1 (en) | 1990-07-02 | 1991-06-20 | Piezoelectrical igniter |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0505513B1 (sv) |
AT (1) | ATE116427T1 (sv) |
AU (1) | AU8201291A (sv) |
DE (1) | DE69106341T2 (sv) |
SE (1) | SE467597B (sv) |
WO (1) | WO1992000498A1 (sv) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5173569A (en) * | 1991-07-09 | 1992-12-22 | The Ensign-Bickford Company | Digital delay detonator |
US5435248A (en) * | 1991-07-09 | 1995-07-25 | The Ensign-Bickford Company | Extended range digital delay detonator |
WO1995020746A1 (en) * | 1994-01-27 | 1995-08-03 | Tpp Technological Industries Ltd. | Autonomous electric detonator |
US5485788A (en) * | 1994-09-27 | 1996-01-23 | Hughes Missile Systems Company | Combination explosive primer and electro-explosive device |
WO1997001076A1 (en) * | 1995-06-23 | 1997-01-09 | Ibq Indústrias Químicas Ltda. | Electronic delay detonator |
FR2814804A1 (fr) * | 2000-10-04 | 2002-04-05 | Denis Dubois | Dispositif de securite electronique sans desalignement de chaine pyrotechnique |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19916952B4 (de) * | 1999-04-15 | 2010-04-15 | Diehl Stiftung & Co.Kg | Nichtletaler elektromagnetischer Wirkkörper |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO137975B (no) * | 1973-10-31 | 1978-02-20 | Ici Ltd | Anordning for utf¦relse av undervannssprengning |
US4648320A (en) * | 1984-04-19 | 1987-03-10 | Diehl Gmbh & Co. | Detonator triggering device |
SE459123B (sv) * | 1987-08-14 | 1989-06-05 | Bert Jonsson | Taendsystem samt saett att initiera detsamma |
-
1990
- 1990-07-02 SE SE9002305A patent/SE467597B/sv not_active IP Right Cessation
-
1991
- 1991-06-20 AU AU82012/91A patent/AU8201291A/en not_active Abandoned
- 1991-06-20 EP EP91912879A patent/EP0505513B1/en not_active Expired - Lifetime
- 1991-06-20 AT AT91912879T patent/ATE116427T1/de not_active IP Right Cessation
- 1991-06-20 DE DE69106341T patent/DE69106341T2/de not_active Expired - Fee Related
- 1991-06-20 WO PCT/SE1991/000443 patent/WO1992000498A1/en active IP Right Grant
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NO137975B (no) * | 1973-10-31 | 1978-02-20 | Ici Ltd | Anordning for utf¦relse av undervannssprengning |
US4648320A (en) * | 1984-04-19 | 1987-03-10 | Diehl Gmbh & Co. | Detonator triggering device |
SE459123B (sv) * | 1987-08-14 | 1989-06-05 | Bert Jonsson | Taendsystem samt saett att initiera detsamma |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5173569A (en) * | 1991-07-09 | 1992-12-22 | The Ensign-Bickford Company | Digital delay detonator |
GB2257776A (en) * | 1991-07-09 | 1993-01-20 | Ensign Bickford Co | Digital delay detonator |
GB2257776B (en) * | 1991-07-09 | 1994-05-25 | Ensign Bickford Co | Digital delay detonator |
US5377592A (en) * | 1991-07-09 | 1995-01-03 | The Ensign-Bickford Company | Impulse signal delay unit |
US5435248A (en) * | 1991-07-09 | 1995-07-25 | The Ensign-Bickford Company | Extended range digital delay detonator |
EP0677164A1 (en) * | 1992-12-22 | 1995-10-18 | The Ensign-Bickford Company | Digital delay unit |
EP0677164A4 (en) * | 1992-12-22 | 1996-04-10 | Ensign Bickford Co | DIGITAL DELAY UNIT. |
WO1995020746A1 (en) * | 1994-01-27 | 1995-08-03 | Tpp Technological Industries Ltd. | Autonomous electric detonator |
US5485788A (en) * | 1994-09-27 | 1996-01-23 | Hughes Missile Systems Company | Combination explosive primer and electro-explosive device |
WO1997001076A1 (en) * | 1995-06-23 | 1997-01-09 | Ibq Indústrias Químicas Ltda. | Electronic delay detonator |
GB2319075A (en) * | 1995-06-23 | 1998-05-13 | Ibq Ind Quimicas Ltda | Electronic delay detonator |
GB2319075B (en) * | 1995-06-23 | 1999-05-12 | Ibq Ind Quimicas Ltda | Electronic delay detonator |
AU706146B2 (en) * | 1995-06-23 | 1999-06-10 | Ibq Industrias Quimicas Ltda | Electronic delay detonator |
FR2814804A1 (fr) * | 2000-10-04 | 2002-04-05 | Denis Dubois | Dispositif de securite electronique sans desalignement de chaine pyrotechnique |
Also Published As
Publication number | Publication date |
---|---|
DE69106341D1 (de) | 1995-02-09 |
EP0505513B1 (en) | 1994-12-28 |
EP0505513A1 (en) | 1992-09-30 |
SE9002305L (sv) | 1992-01-03 |
AU8201291A (en) | 1992-01-23 |
DE69106341T2 (de) | 1995-06-08 |
SE467597B (sv) | 1992-08-10 |
ATE116427T1 (de) | 1995-01-15 |
SE9002305D0 (sv) | 1990-07-02 |
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