FR2470757A1 - PYROTECHNIC CONNECTION WITH SEALED AND SELF-RELEASABLE PARTS - Google Patents

Abstract

THE PRESENT INVENTION CONCERNS A PYROTECHNICAL FITTING WITH WATERPROOF AND SELF-RELIEFING PARTS. THIS PYROTECHNIC CONNECTION ALLOWS THE TRANSMISSION OF A PYROTECHNIC SIGNAL WITHOUT POLLUTION OF THE ENVIRONMENT. IT IS CONSISTING OF TWO WATERPROOF PYROTECHNIC RELAYS 10 AND 14 MOUNTED AT THE END OF THE TWO TRANSMISSION CHAIN 4 AND 6 AND LIKELY TO BE SEPARATED WITHOUT HARM TO THE ENVIRONMENT, THE FIRST RELAY 10 DELIVERING A DETONATION SIGNAL WHICH TRANSMITTED SHOCK WAVE THROUGH FUNDS 24 AND 26 OF THE RELAYS AND STARTS THE EXPLOSIVE LOAD OF THE SECOND RELAY 14. APPLICATION TO THE TRANSMISSION OF A PYROTECHNIC SIGNAL, IN PARTICULAR IN STRUCTURAL LINK OR SEPARATION ASSEMBLIES.

Description

247075?

  The subject of the present invention is a pyrotechnic fitting with watertight and self-sealing parts

  the ignition is effected by shock between two pyroelectric relays

  technical- mounted on the same axis, charges explosive substances and whose envelopes remain

  before, during and after operation.

  This connection fits between two chains of

  pyrotechnic transmission, sheathed, watertight,

  each killed by a strand of detonating cord of

  It is known from French Patent No. 1,470,813 filed March 7, 1966, in the name of the TELEDYNE Company, a detonating device acting through a solid wall without perforating it in order to apply pressure. the outside a shock wave at high speed caused by an explosion, to trigger a blast or detonation on the face

internal of a screen.

  French patent 71 10502 filed March 1971, on behalf of the French State9 for 'dispositif

  pyrotechnic transmission system ", describes a pyrotechnic device

  technique for the linear transmission of a signal consisting of a cord leading to a triggering relay for a hollow charge with effect directed towards a downstream load preceded

  a priming relay for firing a second horn

  of water. The two load-relay assemblies are separated by one

  interval associated or not with a tubular spacer,

  filled with air or similar material Where the hollow charge is replaced by a flat charge9 it may be provided on the gap side of a coating

  conical or disc dug a groove.

  However, the relays of these various known pyrotechnic signal transmission systems are not watertight and self-agglomerating, and therefore can not be used in structural connection or separation assemblies requiring a non-hazardous environment.

polluted after operation.

  The present invention specifically relates to

  a pyrotechnic fitting with watertight and self-

  for the transmission of a pyrotechnic signal-from a first to a second pyrotechnic chain, which. overcomes these disadvantages. It includes two waterproof pyrotechnic relays mounted facing one axis and likely

  to be separated while maintaining their tightness, the said

  lais being arranged so that the first relay delivers a detonation signal as it transits in its form

  shock wave through the funds of the said relays and

  cent the explosive charge of the second relay. Thus, the

  cord according to the invention allows the uncoupling of two.

  component parts and it eliminates in the course of operation the possible deterioration of adjacent material, as well as it avoids the pollution of the environment. Such a connection

  can be used in the field of link structures

  sound or separation such as two stages of gear

  satellites, satellites or their launchers. It eliminates the deterioration of adjacent equipment such as electrical equipment in the vicinity of the connection and is liable to be damaged, since the transmission of the detonation signal between the two relays in contact and loaded with explosives is effected without perforation of neither of the two relay relays, so without heat and powder rejection, -rendable their separation without nuisance

after passing the signal.-

  - - - More precisely, the pyrotech-

  according to the invention comprises :: - -

  a first donor relay, with a sealed bottom,

  initiated by a first reinforcing relay crimped at the end

  mity of the first pyrotechnic chain, the assembly being secured to a first part-of separable structure, - a second relay receiver, bottom sealed, which initiates a second intensifier relay crimped at the end

  of the second pyrotechnic chain, the whole being

  the second part of the separable structure, and, the donor and receiver relays being engaged opposite one of

  the other in the bore of a positioning piece

  dull. clamping means for pressing the funds of the donor relay and the receiver relay against each other; means for sealing between each of said donor and receiver relays and said internal positioning part; means for sealing between each of said donor and receiver relays and the outside

the pyrotechnic connector.

  According to a preferred embodiment of the invention,

  vention, said first pyrotechnic chain.

  inside a first sleeve, the second cha does not

  pledge inside a second sleeve, the first and second chains being held respectively in the first and second sleeves, by a first and a second

nuts screwed into these.

  Other features and advantages of the

  will appear better on reading the description

  following examples of implementation given for

  and in no way limiting, with reference to the figures

  nexées, in which a - Figure 1 is a sectional view of a pyrotechnic connector according to the invention,

  FIG. 2 is a sectional view of a variable

the embodiment of the invention.

  In Figure 1, designated by the general reference 2, the pyrotechnic fitting according to the invention-. The connection 2 allows the transmission of a pyrotechnic signal

  in the direction of the arrow A, a first pyro chain

  technique 4 to a second pyrotechnic chain.

  pyrotechnic 4, constituted by a strand of chalk

  tonant surrounded by a sheath 5, is completed by a first

  reinforcing relay 8, crimped at its end and

  giant in a first pyrotechnic relay 10, said relay donor. The second pyrotechnic chain 6 constituted by a strand of detonating cord surrounded by a sheath 7 is

  the same way, ended by a second reinforced relay

  12 crimped at its end and engaging in a se-

  pyrotechnic relay relay 14, said relay receiver. The re-

  The donor beam 10 and the receiver relay 14 are engaged opposite each other along the same axis inside an internal positioning piece 16. This piece 16

  is pierced with a series of bores of different diameters.

  The narrower central bore 18 receives the relay

  10. In a second bore 20 of the position piece

  central portion 16 is engaged shoulder portion 22 of the receiver relay 14. The bottoms 24 and 26 of these two relays are in contact, The first pyrotechnic chain 4, terminated by

  the reinforcing relay 8 engages within a first

  sleeve 28, while the second pyrotechnic chain

  that 6 ended by the intensifying relay 12 engages inside a second sleeve 30 integral with the structure 31. The first sleeve 28 is screwed on said

  internal positioning piece 16 which is itself solidified

  The structures 29 and 31 are capable of being separated from one another. These are for example two stages of ballistic missiles, satellites or launchers. A first nut 32 holds the end of the first pyrotechnic chain inside the first sleeve 28. In a similar manner, a second nut 34 holds the end of the second pyrotechnic chain inside the second sleeve 30. Two nuts 49 and 50 secure the coupling assembly to the

structural frames 29 and 31.

  The pyrotechnic connector according to the invention

  carries clamping means to press one against the other

  The bottoms 24 and 26 of the donor relay 10 and of the receiver relay 14 are the following. These clamping means consist of a helical spring 36 housed inside the bore 37 of said internal positioning piece 16, and compressed

  between the donor relay 10 and the first sleeve 28.

  In order to prevent any possibility of pollution of the ambient environment by gas or powder jets, the pyrotechnic connector 2 according to the invention comprises means for sealing between each of said

  donor relay 10 and receiver 14, and said position piece

centralization 16.

  These means are constituted by different joints

  O-rings: an O-ring 38 placed between the relay

  neur 10 in the bore 18, and on the other hand, a toroidal seal

  that centering 40 placed in the receiver relay 14 of

the bore 20.

  The pyrotechnic connector 2 further comprises means for ensuring a seal between the donor relay and the outside of the pyrotechnic connector. These means consist of different seals an O-ring 42 placed in a groove of the first booster relay 8D a seal 44 placed between the internal positioning piece

  16 and said first sleeve 28. On the other hand 2 on the re-

  In this embodiment, the means for ensuring a seal between the receiving relay Ad and Il @ below the pyrotechnic connector 2 consist of an O-ring 46 placed in a groove of the intensifying relay 12 and a seal 48 placed between the receiver relay 14 and the said second relay. sleeve 300 The operation of relay 2 is as follows. A

  detonator (not shown) initiates the transmission chain.

  4 to detonate the explosive of the donor relay l0.

  The detonation signal delivered by this donor relay is sufficiently energetic to transit in the form of a wave

  shock through the watertight bulkheads 24 and 26

  killed by the relay funds, and to start the explosive of the

  receiving relay 14, in order to transmit the pyro signal

  6. After the passage of the signal, without perforation of any of the two bottoms 24 and

  26, the two donor and receiver relays can be separated

  Res no nuisance to the environment.

  In the variant embodiment of the connection re-

  shown in FIG. 2, the first pyrotechnic relay, referred to as a "donor" relay 10, receives the pyrotechnic signal from the first transmission chain 4 constituted by a strand of detonating cord surrounded by a sheath 5 and terminated

  by an intensifying relay 8 crimped at its end.

  The second pyrotechnic relay, called relay relay

  receiver "14", initiated by relay 10 retransmits the signal

  pyrotechnic to a second chain of transmission 6 con-

  staggered by a strand of detonating cord surrounded by a sheath 7 and terminated by a reinforcing relay 12 crimped at its end. The donor relay 10 and the receiver relay 14 'are engaged opposite one another, on the same axis, in a positioning piece 16' whose end 16'a

  shaped like a truncated cone receives the end 14'a also

  the truncated cone of relay 141, the funds

  24 and 26 of these two relays in contact.

  The first pyrotechnic chain 4 engages inside a sleeve 28 'whose internal end comes to rest on the donor relay 10, said chain being screwed into said sleeve 28' by means of a nut 32. This sleeve 28 'is itself screwed into the room 16'

  secured to a frame 29 of the structure.

  The second pyrotechnic chain 6 engages inside a sleeve 30 whose inner end 30a

  is screwed on the rear portion 14'b of the relay 14 '.

  The sleeve 30 is secured to a structural frame

  -31 while the second chain 6 is screwed into the man-

  30 by means of a nut 34. Two nuts 49 and 50

  fastened the entire fitting to the frames

of structure 29 and 31.

  The clamping means for pressing one against the other the bottoms 24 and 26 of the donor relay 10 and the receiving relay 14 'are constituted by the internal positioning piece 16' screwed onto the sleeve 28 'and by a counter nut 51 leaning internally on a flange 28'a of the sleeve 28 ', and screwed on the outer portion 16'b of the piece 16. Such a screw system and

  locking nut ensures better resistance to

brations of the entire fitting.

  The sealing of the "donor" part of the coupling is provided by a seal 52 situated between the relay 10 and the

  sleeve 28 'while the sealing of the "receiving" part

  "is provided by a joint, in this case a joint

  glue between the relay 14 'and the sleeve 30.

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Claims (6)

  1. Pyrotechnic connection with watertight parts and   autolargable for the transmission of a pyrotechnic signal   than a first to a second pyrotechnic chain, characterized in that it comprises:   - a first relay (10), donor, thoroughly   che (24), initiated by a first intensifying relay (8) crimped at the end of the first pyrotechnic chain (4), the assembly being integral with a first separable structure part (29), -a second relay ( 14), receiver, with a sealed bottom (26), which initiates a second intensifying relay (12) crimped at the end of the second pyrotechnic chain (6),   the whole being attached to the second part of the structure   separable head (31) and the donor (10) and receiver (14) relays being engaged in a bore of a workpiece   internal positioning (16), the funds (24 and 26)   said relays in contact therewith - clamping means for pressing one against   the other the funds of the donor relay and the relay   dreamer; means for sealing between each of said donor (10) and receiver (14) relays and said internal positioning piece (16); means for sealing between each of said donor (10) and receiver (14) relays and   the outside of the pyrotechnic fitting.   2. Pyrotechnic connection according to the claim   1, characterized in that said first pyro chain   technique (4) engages inside a first sleeve (28), the second chain (6) engages inside a second sleeve (30), the first and second chains (4 and 6) being respectively held in the first and second sleeves (28 and 30) by first and second   nuts (32 and 34) screwed into these.   3. Pyrotechnic connection according to the claim   1j, characterized in that the clamping means for   the funds of the donor relay and of the receiver relay are counterbalanced by a spring (36) housed inside the bore (37) of the internal positioning part (16) and compressed between the donor relay (10 and the first sleeve (28).   4. Pyrotechnic connection according to the claim   1, characterized in that the clamping means for pressing one against the other the bottoms of the donor relay (10) and the receiver relay (14 ') comprise a conical connection between said receiver relay (10) and the piece of   internal positioning (16 ') and a screw   killed by said positioning piece resting on the donor rim (10) and screwed onto the first sleeve (28 ') and by a locknut (51) resting on a flange (281a) of said first sleeve (28'). ) and screwed on the part   external (161b) of said positioning piece (16).   S Pyrotechnic connection according to the claim   1, characterized in that the means for ensuring   between each of said donor relays (10) and   (14) and said internal positioning piece (16) 8 are constituted by a seal (38 and 40) placed between each   relays and the bore (18, 20) of the position piece   internally (16) in which they are engaged.   6. Pyrotechnic connection according to the claims   1 and 2, characterized in that the means for   seal between the donor relay (10) and the   inside the pyrotechnic connector (2) are constituted by   a seal (42) placed between said first reinforcing relay   - tor (8) and said first sleeve (28), and by a joint   (44) placed between the latter and said positioning piece internally (16).   7. Pyrotechnic connection according to the claims   1 and 2, characterized in that the means for   between the receiver relay (14) and the   inside the pyrotechnic connector (2) are constituted by   a seal (46) placed between said second reinforcing relay   tor (12) and said second sleeve (30) and by a seal (48) placed between said second sleeve (30) and the receiver relay (14).