RU2737094C1 - Initiating device with delay of actuation - Google Patents

Abstract

FIELD: pyrotechnics.SUBSTANCE: invention relates to pyrotechnics and can be used to provide temporary delays in designs of igniters, for example, for pressure sources, gas generators, in pyroautomation systems for mechanical movement of structural elements, for engagement of fire circuit of fuses, etc. Device includes a housing with two coaxial channels separated by one indestructible barrier, one of which is intended for arrangement of transmitting charge, and the other is to accommodate successively slow charge from pyrotechnic composition, intermediate and located in the cap of the accelerating gas-generating charge, wherein the free space between the cap and the end surface of the body is filled with incompressible inert material which is polymerized after casting, flush with the housing end.EFFECT: high accuracy of operation of the device and improved manufacturability thereof.1 cl, 2 dwg

Description

The invention relates to the field of pyrotechnics and can be used to provide time delays in the designs of ignitors, for example, for pressure sources, gas generators, in pyroautomatics systems for mechanical movement of structural elements, for activating the fire chain of fuses, etc.

The problem solved by the claimed invention is to create a design of an initiating device with a stable deceleration time, which does not contain initiating explosives, which is triggered with high reliability, is safe in production and easy to manufacture.

The known design of the initiating device according to the patent) US 5175390 (publ. 29.12.1992), which is a detonator with a time delay, which contains a sleeve with a replacement charge made of three parts - two extreme and one intermediate, pressed between them. The extreme parts of the retarding charge are made in the form of caps equipped with a composition, the burning rate of which exceeds the burning rate of the composition of the intermediate part. The intermediate part includes five identical sections with a variable stepped section increasing in the direction of combustion propagation. This design of the retarding charge ensures the stability of the continuous combustion process for the required time under difficult operating conditions due to the artificial increase in the contact surface, which ensures high reliability of operation. The burning time is controlled by adjusting the height of the intermediate part of the retarding charge, which can be made of a smaller number of identical sections of variable cross-section.

The disadvantage of the known device is the complexity of the design and low-tech assembly, requiring a large number of operations.

It is also known an initiating device with a delayed response, which provides stability of operation and an increased ignitability. The device includes a housing in which a partition, receiving, retarding and igniting charges are placed in series. The baffle is made indestructible as a single whole by the body, and the receiving charge is adjacent to the baffle, the end face of the igniting charge is closed by a metal membrane, the membrane is made of equal thickness and a guide sleeve is connected to the body from its side to form a gas flow. Combustion of the igniting charge, activated from the initial impulse, heats up the housing baffle and ignites the receiving charge insert. Combustion is then transferred along the chain to the retarding charge, the sensitive ignition charge insert and the rest of the igniting charge. The membrane maintains the pressure of the gases of the burning compositions until the last composition that is included in the ignition charge burns out (patent RU 88125, published on October 27, 2009).

The use of an initial impulse ignition charge to initiate a retardation charge results in a variance in response time because here the initiator is a thermal pulse, and the conditions of combustion of the receiving charge depend on the parameters of the environment.

The closest in terms of the number of similar features to the claimed invention is the design of the initiating device according to patent RU2210722 (publ. 20.08.2003), selected as a prototype. This initiating device, which in a particular case performs the function of a pyrotechnic moderator, is a metal case with two coaxial channels separated by an indestructible barrier, one of which is designed to accommodate a detonating transmitting charge, and the other is intended to accommodate a retarding charge from a pyrotechnic composition (PTS), intermediate and located in the cap of the amplifying gas-generating charge. The cap is designed to prevent the charge from spilling out. The transmitting charge generates a shock wave in the housing and through an indestructible barrier initiates a retarding charge from the PFS, the combustion from which, after the required time has elapsed, is transferred to the intermediate charge, and from it to the booster gas-generating charge. Under the action of the pressure of the combustion products of the gas-generating charge, an effort is created from which an actuator is activated. for example, an impact detonating device that converts a mechanical impulse into a detonation one.

The disadvantage of the prototype is that. that under the action of the pressure of the PFS combustion products, the cap with the gas-generating charge can shift axially in the moderator housing, which leads to an increase in volume and, as a result, a pressure drop in the combustion zone, accompanied by a decrease in the velocity at the combustion front and an unregulated increase in the time delay. To eliminate this phenomenon, the end face of the cap relative to the end surface of the initiating device body should be installed with the minimum possible sinking, or better without it. If there is a tolerance field for the dimensions of the manufactured elements of the device and the cap is pressed in at a given pressure, the minimum depth of its sinking is ensured by selecting the mass of an intermediate charge located between the retarding and gas-generating charges. For this purpose, in each manufactured sample of the initiating device, it is necessary to measure the actual value of the PFS sinking relative to the end face of the initiating device body, the height of the cap with the gas-generating charge, and by calculation to determine the mass of the intermediate charge (with its subsequent weighing), which, at a given press-in pressure of the above-mentioned cap sinking relative to the end surface of the moderator housing. Naturally, such a retarder manufacturing process is complex, time consuming and not technologically advanced.

The technical result of the claimed invention is to ensure high accuracy of the device and improve the manufacturability of its manufacture.

The specified technical result is achieved due to the fact that in an initiating device with a response delay, which includes a housing with two coaxial channels separated by an indestructible obstacle, one of which is designed to accommodate a detonating transmitting charge, and the other is to place a sequentially retarding charge from a pyrotechnic composition, intermediate and located in the cap of the amplifying gas-generating charge, the novelty is that the free space between the cap and the end surface of the housing is filled with an incompressible inert material that polymerizes after pouring, flush with the end of the housing.

Filling the free space between the cap and the end surface of the body with an incompressible inert material, polymerizing after washing, flush with the end of the body, ensures that there is no axial shift of the retarding charge during its combustion, thereby ensuring the exact operating time of the initiating device, and the magnitude of the PFS sinking does not need to be measured and can fluctuate within the limits due to the presence of a tolerance field for the geometric dimensions of the elements of the initiating device located in the zone of the gas-generating charge.

FIG. 1 shows a diagram of the inventive device, FIG. 2 is a diagram of a detonation relay, the design of which includes the claimed initiating device, where:

1 - body of the initiating device:

2 - channel for placing a detonating transfer charge:

3 - receiving retarding charge;

4 - intermediate charge;

5 - cap;

6 - booster gas-generating charge:

7 - incompressible inert material;

8 - bushing;

9 - piston-striker;

10 - detonating device;

11 - striker.

An example of a specific implementation of the inventive device can serve as an initiating device containing a steel body L in which there are two coaxial channels, separated by an indestructible barrier. One channel (2) is designed to accommodate a detonating transmitting charge made of high explosives (BVV). for example, based on heating elements. The other channel contains a receiving delayed charge of the 3rd MTS, an intermediate charge 4 from MTS or BVV and an amplifying gas-generating charge 6 from BVV placed in the cap 5. Here, the cap 5 with the gas-generating charge 6, with a constant mass of the intermediate charge 4, deliberately sinks relative to the end of the housing 1 and the magnitude of this sinking. that does not need to be measured, can fluctuate within the limits due to the presence of a tolerance field for the geometric dimensions of the elements of the initiator located in the area of the gas-generating charge, and the free space between the cap and the end surface of the moderator body 1 is filled with an incompressible inert material 7, polymerized after pouring it into free cavity above the cap 5. flush with the end of the body 1. To install the initiating device in the detonation relay structure, the body 1 is screwed into the steel sleeve 8. The body 1 rests with its end on the piston-striker 9. held by the flange in the sleeve 8. Behind the piston - the drummer, through the air gap guaranteed by the design of the detonation relay, a mechanical detonating device (DU) 10 based on the BVV is located, made in accordance with the declared design under the patent RU 2103661 (publ. 27.01.1998, bull. No. 3).

Upon detonation of the transmitting charge placed in channel 2, a shock wave is generated in housing 1, which, after passing through an indestructible obstacle, ignites the receiving retarding charge 3. From the receiving retarding charge 3, after the required time has elapsed, combustion is transferred to the intermediate charge 4, and from it to the gas-generating charge 6. Under the action of the force created by the pressure of the combustion products of the gas-generating charge 6. the flange on the piston-striker 9 is cut off and the latter produces a dynamic effect on the firing pin 11 DU 10, in which the mechanical impulse is converted into a detonation one. Further, from the detonation relay, the detonation spreads into the blast circuit attached to it or an explosive circuit in the form of a DS. or in an intermediate amplifier detonator. This design of the claimed initiating device assumes not only the exclusion of the possibility of moving the receiving retarding charge 3 during the combustion of the PFS due to the incompressibility of the inert material 7, which guarantees the necessary accuracy of the time delay, but also a significant simplification of the technology of equipping the body 1 of the initiating device, since in this case there is no need intentions in each assembly unit of the amount of sinking of the charge 3 from the ASG, the height of the cap 5 with the gas-generating charge 6 and the choice, depending on the result obtained, of a specific mass of the intermediate charge 4.

To test the effectiveness of the claimed invention, three batches of detonation relays were tested, differing in that the first of them used an initiating device. in which the cap 5 with the gas generating charge 6 was sunk relative to the end surface of the body by 0.2-0.4 mm and this free volume was not filled with anything; in the second, the sinking of the cap 5 relative to the body 1 was eliminated by selecting the mass of the intermediate charge 4; and in the third, the free volume above the cap 5 with the gas generating charge 6 was filled with the VGO-1 GU 38.303-04-0 sealant, and the sinking depth of the cap 5 with the same mass of the intermediate charge 4 ranged from 0.38-0.47 mm.

In all initiating devices, the PTS according to patent RU2297404 (publ. 20.04.2007, bull. No. 11) was used as a receiving retarding charge, the thickness of the barrier between the transmitting and receiving and retarding charges with a diameter of the latter of 1.5 mm was 1.8 mm. the gas generating charge was made from HMX.

The tests were carried out on 6 samples of the detonation relay of each batch. As a result, it was found that the average detonation delay time, standard deviation and coefficient of variation were for the first batch, respectively: 1.10 ms, 0.32 ms and 29%; for the second - 0.71 ms, 0.07 ms and 9.9%; for the third - 0.72 ms, 0.04 ms and 5.6%.

From a comparison of the results of these tests, it follows that the elimination of the possibility of displacement of the cap with a gas-generating charge during the operation of initiating devices in the detonation relays of the second and third batches leads to both a decrease in the response time and a significant increase in its stability. It can be seen that the initiating devices in the detonation relays of the second and third batches, made according to two different design schemes and differing in equipment technology, but the timing parameters of the actuation are practically the same.

Claims (1)

An initiating device with a response delay, including a housing with two coaxial channels separated by an indestructible obstacle, one of which is designed to accommodate a transmitting charge, and the other is intended to accommodate a sequentially retarding charge from a pyrotechnic composition, an intermediate and an amplifying gas-generating charge located in the cap, characterized in that the free space between the cap and the end surface of the body is filled with an incompressible inert material that polymerizes after pouring, flush with the end face of the body.

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