| 摘要 |
1,173,190. Explosive cartridges. INSTITUT FRANCAIS DU PETROLE DES CARBURANTS ET LUBRIFIANTS. 21 Dec., 1967 [26 Dec., 1966; 13 Oct., 1967], No. 58229/67. Heading F3A. [Also in Division H4] In a system for electrically firing an explosive charge below a volume of liquid to generate seismic energy, the charge is located in the nose portion of a cartridge body having nose and head terminations, that end of the charge closer to the cartridge head is connected to a conducting element enclosed by the cartridge body part comprised between the head and the charge, the other end of the charge is connected through a second conducting element, at least partly external to the cartridge, to a third conducting element, and a current source is connected indirectly to the first and third conducting elements. In the Fig. 3 system the cartridge comprises electrically insulating body 7 with a head 8 which seats against member 2 to position the cartridge in relation to loading tube 1. The charge is contained in an insulating tube 11 with conducting end members 13, 14 which are linked by wire 12. Body 7 is provided with an external conductive coating 16 at the nose and encloses a tube 17 having a conductive coating 18. The firing circuit for exploding wire 12 to detonate the charge comprises electrode 3, water inside loading tube 1, coating 18, end member 13, wire 12, end member 14, coating 16, water surrounding the cartridge, and a return electrode (not shown). Modifications are described in which (a) tube 17 and coating 18 are replaced by an internal conductive coating on body 7, which coating may or may not make direct electrical contact with an extension of electrode 3; and (b) a conducting charge is used so that wire 12 is not required. In the Fig. 6 system the charge comprises a stable pulverulent component 23 (e.g. ammonium nitrate and/or aluminium powder) and a glass or plastic encapsulated stable liquid component 24 (e.g. nitrobenzene or dinitrotoluene). Water pressure forces the cartridge through the loading tube and then causes spiked sliding member 27 to break the capsule 24. The firing circuit comprises electrode 3, water in the loading tube, conductive coating 15, a pair of wires 25 which link coating 15 to a stud 26 traversing the cartridge nose, stud 26, and a yoke-shaped return electrode 33. Instead of pulverulent charge component 23, one or more encapsulated liquid components may be used. |
