RU2305249C2 - Shell for laying of low-temperature false thermal target - Google Patents

Abstract

FIELD: means for delivery of materials for formation of artificial fogs or smoke screens launched from transport facilities and intended for their protection against enemy's weapon with thermal guidance systems.

SUBSTANCE: the shell has an engine and a cylindrical metal body with a bottom containing pyrotechnic, propellant and primer-ejection charge. The shell is made for axial rotation, and the pyrotechnic charge in the form of a set of combustible annular elements is laid in two pairs of semicylinders and compressed from two sides by a movable piston and the body bottom. Each annular element is based on fiberglass impregnated by a compound forming an infra-red radiation, and a fireproof material is applied an it. The annular elements located in one of the pairs of semicylinders are made with an increased inside diameters, and the body and the engine are coupled with slackening.

EFFECT: enhanced quality and reliability of laying and action of the low-temperature false thermal target.

1 dwg

Description

The present invention relates to the field of military equipment, and in particular to means of delivering materials for the formation of artificial fogs or smoke screens launched from vehicles and designed to protect them from enemy weapons with thermal guidance systems capable of spectrally emitting low-temperature thermal radiation from protected objects.

Systems have been developed and are in the arsenal of many countries that make it possible, with varying degrees of reliability, to protect military and civilian objects from missile, including high-precision enemy weapons.

However, guidance systems are currently used to circumvent standard protection systems by detecting the low-temperature component of the infrared radiation of the protected object, which necessitates the use of layered combined and expensive equipment and equipment. One of the solutions to this problem is the creation and use of projectiles of low-temperature false thermal targets.

Known smoke cartridge (US patent No. 4391197, CL 102-334, 09/19/1980) for the instant creation of a smoke screen containing a housing, inside which are sets of circular disk-shaped smoke bombs. Each of them has an axial hole and together they form a central hollow channel of the cartridge. Part of the smoke-generating composition of which the checker is made is turned directly into the central channel. Checkers are not interconnected and are easily separated after ejecting them from the body. At the rear end of the housing is a compartment containing a propellant with a moderator. When ignited, a stream of flame enters the central channel on one side and sets fire to all the checkers at once; simultaneously, the propellant throws them out of the case.

The disadvantages of the known design is that the resulting smoke screen acts near the protected object for a short period of time and has a small size. Therefore, this design is not able to fulfill the task of the invention.

As a prototype, the device for protecting the object according to the patent of the Russian Federation No. 2187062 (class 7 F41Н 9/06, F42В 5/155, dated 04/08/2000), including a projectile containing a cylindrical metal case equipped with aerosol-forming pyrotechnic, propellant and igniter, was selected -excessive charges; moreover, the pyrotechnic charge is made in the form of a set of combustible annular elements with an axial hole, which together form a central hollow channel, on one side of which there is an ignition-blow charge equipped with a moderator.

On the flight path, the projectile shoots off the bottom of the hull and throws a set of burning ring-shaped elements into the incoming air stream.

The disadvantages of this design is that although a thermal false target is formed in the form of burning ring-shaped elements floating in the air, their burning lasts for a short period of time and the resulting cloud is small. Therefore, the known design does not ensure the achievement of the technical task indicated below.

The technical task of the invention is to eliminate the above disadvantages, namely improving the quality and reliability of the formulation and operation of the low-temperature false thermal target.

The problem is solved in that the projectile for setting a low-temperature false thermal target contains an engine and a cylindrical metal body with a bottom containing pyrotechnic, propelling, and ignition-blow charges, and the pyrotechnic charge is made in the form of a set of combustible annular elements with an axial hole placed in the body cavity and forming a central hollow channel, on one side of which the specified ignition-blow charge is installed, equipped with a moderator. The projectile is axially rotatable, and the set of combustible ring-shaped elements is stacked in two pairs of half-cylinders and compressed on both sides by a movable piston and the bottom of the body, each ring-shaped element is made on the basis of fiberglass, impregnated with an infrared radiation-generating composition, and fire-retardant material is applied on it, moreover, the ring-shaped elements placed in one of the pairs of half-cylinders are made with an increased inner diameter, and the connection of the housing with the engine is made with an attenuation element.

The technical advantages of the proposed design compared to that described in the prototype are: 1) centrifugal forces transmitted from the rotation of the projectile contribute to the rapid expansion of the pairs of half-cylinders and the burning ring-shaped elements inside them; 2) the use in the last warp of fiberglass with a fire-retardant material deposited on it contributes to an increase in the duration of the specified false target by 5 ... 8 times, which is one of the main parameters of the effectiveness of the action; 3) the use of a movable piston, a pair of half-cylinders and the connection of the housing with the engine, made with a weakening element, allows you to keep the payload intact until it is dispersed in the oncoming air flow; 4) the use of ring-shaped elements with an increased inner diameter, placed in one of the pairs of half-cylinders, allows for the ejection of the payload from the cavity of the shell of the projectile to ensure a significant reduction in the time to exit to the mode, which increases the efficiency of the projectile. All together the listed features in their combination contribute to the reliability of the formulation and operation of the low-temperature false thermal target.

The essence of the proposed design is illustrated in the drawing and description thereof.

The projectile contains a turbojet engine 1 with a transitional bottom 2, a fuse 3, a cylindrical metal body 4, a piston 5, two pairs of half cylinders 6 with pyrotechnic ring-shaped elements 7 and 7 ′ placed therein. On the piston 5, on the one hand, a knockout charge 8 with a moderator 9 is placed, and on the other hand, an amplifying (igniter) charge 10, forming a flammable-knockout charge. Elements 7 and 7 ′ with axial holes form a cylindrical hollow channel 11 and are compressed along the axis of the projectile by a movable piston 5 and the bottom of the housing. Fire protection material is applied to each elements 7 and 7 ′. The connection of the housing 4 with the engine 1 is made with a weakening element.

The proposed design operates as follows.

At a predetermined portion of the projectile’s flight path, fuse 3 fires, a moderator 9 and an amplifying charge 10 ignite from it. Gases generated by the combustion of the latter ignite elements 7 and 7 ′ along the central channel 11 formed by them; a moderator 9 initiates a kick charge 8, the gases of which act on the piston 5 and push the elements 7 and 7 ′ out of the housing 4 through the half-cylinders 6 and shoot the engine 1 with the transition bottom 2. By centrifugal forces, the half-cylinders 6 and the burning elements 7 and 7 ′ are thrown to the sides; and elements 7 create a bright flash, and then the rest - a low-temperature false thermal target in the form of a cloud.

Flight tests of prototypes confirmed the correctness of the chosen design and the achievement of the required parameters.

Claims (1)

A projectile for setting a low-temperature false thermal target, comprising a motor and a cylindrical metal body with a bottom, including pyrotechnic, propelling, and ignition-blow charges, the pyrotechnic charge being made in the form of a set of combustible ring-shaped elements with an axial hole placed in the cavity of the body and forming a central hollow channel , on one side of which the specified ignition-blow charge with a moderator is installed, characterized in that it is made with the possibility of axial time a set of combustible ring-shaped elements of a pyrotechnic charge arranged in two pairs of half-cylinders and compressed on both sides by a movable piston and the bottom of the housing, each ring-shaped element is made on the basis of fiberglass impregnated with an IR-generating composition and flame retardant material is deposited on it, and the ring-shaped elements placed in one of the pairs of half-cylinders are made with an increased inner diameter, and the connection of the housing with the engine is made with an attenuation element.