Brush-type charge made out of the ballistite solid rocket propellant with the igniter

FIELD: chemical industry; other industries; production of the brush-type charges made out of ballistite solid rocket propellant with the igniters.

SUBSTANCE: the invention is pertaining to the brush-type charges made out of ballistite solid rocket propellant with the igniter. The igniter contains the batch fitting of the smoky rifle blasting powder in the casing located in the central cavity of the internozzle space of the back head of the engine. The igniter batch fitting contains the coarse fraction of the smoky rifle blasting powder, the mass share of which in the batch fitting is determined by the given ratio. The invention improves reliability of the charge operation at the negative temperature of the surrounding medium.

EFFECT: the invention ensures the improved reliability of the charge operation at the negative temperature of the surrounding medium.

2 tbl

 

The invention relates to devices, rocket - charge of solid rocket fuel and explosives, in particular supplementary sweeping charges of fuel ballistic type igniters nozzle location.

Usage charges the brush type is typical for pulsed solid-propellant short (0,01-0,02) time used in the systems melee (engines antitank grenade launchers, pturs, flamethrowers and the like). The charges are in the form of a bundle tonkoslojnikh fuel tubing (or other elements of the profile), attached to the front bottom of the camera solid rocket motor holding structure.

Fuel charges are conitnue (pyroxylin) or dibasic (ballistic) powder, processed by extrusion. The use of ballistic fuels are preferred. Their production is carried out using high-energy additives, EXPLOSIVES, modifiers burning speed, which provides a high ballistic quality of the used fuels and charge of them.

The brush fire charges is igniters placed in peoplefrom the volume of the solid rocket motor is the input side of the nozzle, or in the Central cavity megaplug space of the bottom.

As the igniter composition mostly use granular smoky gun powder in the form of a mechanical mixture of potassium with the litres, sulfur and coal.

Of the known devices, in this way, you can mark the device brush charges pyroxylin and ballistic fuels and their igniters for RPG USA UM-235 (U.S. patent No. 3278356, CL 156-294), French LRAC-ACL-89F1 ("Military technology and Economics", vol. With, 1976, 6; U.S. Pat. 1351422, F42B), APILAS ("Foreign military vehicles", ser. I, 1981, 12 (60), 16), taken as analogues of the present invention.

In the above analogues of the ignition charge is igniters, smoky gun powder in plastic case or aluminum foil installed in the critical section of the nozzle and performs the role of the forcing device (plugs).

It is known device, the solid-propellant charge and liner on the nozzle plate, so low-side charge blade clamp and containing a portion of the igniter composition - smoky gun powder (U.S. Pat. Of the Russian Federation No. 2062344, F02K 9/08, 1993).

This device is used as a prototype of the present invention.

The drawbacks and prototype are as follows.

Actuation of the igniter, solving the problem of reliable ignition of the surface of the brush charge, is associated with considerable force on the fuel cell shock wave of combustion products from the igniter according to the scheme impact forces compression of the fuel rods, sealed at the ends to secure the left.

Force of combustion products from the igniter greatly exacerbated by the cumulative effect of the inlet nozzle section or cavity that runs in the nozzle plate to accommodate the body of the igniter.

When used as an igniter compositions of fine-grained smoky gunpowder (for example, PE-2, PE-1 according to GOST 1028-79, as it is practiced on a mass scale) force gas igniter for the fuel elements of the brush charge more because with decreasing grain size igniter composition increases the rate of gasification and power of the shock wave generated gases.

The lower hinge igniter composition to reduce the impact on fuel charges may result in the delay of ignition due to the lower value of the specific heat per unit of surface charge.

The impact of the shock waves of combustion products from the igniter causes the elements of the charge voltages in excess of the level allowed by the strength of the fuel. The latter is usually characterized by the ability of the material of the charge (fuel) without destruction to take shock loads, namely its specific toughness andto.

The value of the specific toughness varies for different types of Oplev, especially in extreme temperatures (-40÷50° (C)outside the mechanical glass transition fuel.

And if pyroxylin (koritnik) fuels, the specific impact strength is retained at low temperatures high enough (10-14 kg·cm/cm2)for ad ballistic fuels, received by now widely used to brush the charges, the value of the specific toughness is much lower (5 to 6 kgf·cm/cm2).

Insufficient toughness of the fuel elements when ignited, the brush charge leads to mechanical damage and then their destruction with the emission of unburned fragments of fuel, resulting in lower ballistic qualities of the charge and the shot in General, first - level and range of the basic parameter values muzzle velocity of the shot.

The problem to which the invention is directed, is to develop a system device "brush charge - igniter" with high reliability at extreme temperatures of combat application.

This task is especially important, because of the domestic samples have lower temperature boundary of the combat application minus 50°and foreign - minus 31-32°C.

Fasting is undertaken the task is solved with respect to the igniter devices of the brush charges with a hinge smoky gun powder.

The solution to this problem suggested by combining (mixing) large (for example, CSDP-2, CSDP-1) and small (PE-2, PE-1) fractions smoky gunpowder in the mounting of the igniter brush charge.

A massive proportion of the coarse fraction in the sample proposed to appoint ratio

where α - mass fraction coarse fraction (CSDP) in the sample smoky gunpowder;

m - hitch smoky gunpowder igniter, g;

W - free volume of the housing of the igniter cm3;

0,8÷0,9 - bulk density of smoke of gunpowder, g/cm3.

For example, in the igniter charge free amount W of the housing of the igniter 4,33 cm3the proposed ratio of (1) a combination of external and internal coarse-grained (mCSDPand fine-grained (mPE) fractions smoky gunpowder will be: (table 1).

2,1
Table 1
αmCSDPmPEm
0*03,53,5
0,41,21,83,0
0,51,451,452,9
0,61,71,12,8
0,80,552,65
1,0*2,502,5

About the effectiveness of the proposed technical solutions show experimental data muzzle velocity V, m/s shot Metis-2" with the same party brush charges H ballistic solid rocket fuel at a temperature of minus 50°With igniter in a plastic case hemispherical shape, placed in a similar recess megaplug space of the bottom of the solid obtained in the limit (*) versions of the sample smoky gunpowder (α=0 and α=1).

Table 2
αHitchV0m/sV0TUm/s , not less thanVcp.m/sProbabilistic deviation rvm/s
0PDA, 3.5 g53,3; 50.5; 44,8; to 49.9; 44,65048,62,56
1CSDP, 2.5 g53,3; 52,1; 54,4; 53,3; 53.5; 53,65053,50,52

The charge brush type of ballistic solid rocket fuel igniter is placed in the Central cavity of the nozzle plate and containing the nave is of the SSI smoky gun powder, characterized in that the mass fraction of coarse fraction in the sample (CSDP) is a value determined by the ratio

where α - mass fraction CSDP;

m - hitch smoky gunpowder igniter, g;

W - free volume of the housing of the igniter cm3;

0,8...0,9 - bulk density of smoke of gunpowder, g/cm3.



 

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