RU2426000C1 - Device to produce channel charge from rocket mix rocket solid propellant - Google Patents

Abstract

FIELD: engines and pumps.

SUBSTANCE: proposed device comprises case with barrel cup, cover with ledge that enter the barrel cup groove. Cover is made up of top and bottom parts with concentric joint to allow mutual displacement of said parts. Outer cover is additionally provided with elastic gasket fitting to collar. Outer and inner covers are rigidly and separately secured on aforesaid housing.

EFFECT: higher quality of solid propellant charges.

2 cl, 2 dwg

Description

The invention relates to the field of manufacture of solid fuel end-face and channel combustion, obtained by pouring (free or pressurized) fuel mass into a housing having a cuff with a groove on the free end and an elastic gasket.

The proposed solution relates to techniques for manufacturing rocket engines from mixed solid fuels, obtained by pouring (free or pressurized) fuel mass into a rigid body with one open end.

A device for forming charges of mixed solid fuel according to the patent of the Russian Federation 2194875 from 09/20/2001, adopted by the authors as a prototype.

The disadvantage of the prototype is that the free end of the cuff, abutting the lid both during assembly, and during filling and polymerization, can occupy an uncontrolled position - to bend, “flex”, and it is difficult to control and fix it during assembly - it is not visible and there is no access, and after filling it is generally impossible. This cuff behavior can cause delamination and cracking.

In addition, when forming charges in which the channel forming needle has a developed fuel contact surface that is close to or larger than the charge body, for example, due to several longitudinal ribs (“star-shaped” channel), the cap extraction force with the needle can be close or greater strength of the fastening of the fuel with the body, which is unacceptable, because it can lead to separation of the charge from the body. This is due to the fact that the adhesion force of the removed snap-in elements to the fuel is proportional to the area of their contact.

An object of the invention is to eliminate these disadvantages and improve the quality of the charge.

This goal is achieved by the fact that in the device for forming a channel charge from mixed solid fuel containing a housing with a cuff, a technological cover with a protrusion included in the cuff groove, the cover is made of two parts with a concentric connector, the possibility of their mutual axial movement and formation on the outer cover of the stepped girdle, while the cuff is additionally equipped with an elastic gasket adjacent to the girdle, and the outer and inner covers are rigidly and separately fixed to the housing lia.

It is also advisable that the width of the belt is performed in such a way that the stresses in the fuel in the zone of contact with the belt during disassembly with a given force are not more than 80% of the compressive strength of the fuel.

The proposed design of the forming tooling with the composite cover of the molding device is illustrated in FIG. 1, which shows a longitudinal section of the open end of the charge assembly with the forming tooling.

A cuff 2 is located on the inner surface of the housing 1 from the side of the open end, with an elastic gasket 3 protruding inward (towards the axis of the housing) (a skirt of thin elastic material, for example, rubber impregnated with nylon). The gasket 3 is attached to the cuff or can be performed along with it. The gasket 3 is adjacent to the stepped girdle 11 made on the outer cover.

The end cover consists of two parts. A flange 4 is fixed on the outer surface of the casing, to which one part of the end cover is fastened with the help of clamps 5 - the outer ring cover 6, which is centered on the outer landing surface of the casing.

The cover 6 is provided with an annular protrusion ("tooth") included in the groove of the cuff.

The other part of the end cap - the inner cap 7 - is mounted on the needle 9, forming a channel and having partially or throughout its length "star" shape (figure 2). A seal 10 is installed in the depth of the gap between the covers. The inner cover is fastened to the flange 4 with clamps 8.

When assembling the mold, a flange 4 and an outer cover 6 are installed on the housing 1, after which the fit of both the elastic strip 3 and the cuff itself is visually checked. In case of emergency, the gasket 3 can be spot-glued to the cover. In any case, the cuff and gasket already have an unequivocal position during assembly.

Then, the inner cover 7 with the needle 9 is mounted and fastened to the flange.

The device goes to fill.

During molding and polymerization, the internal pressure is perceived by both covers and transmitted through the flange to the product body.

The elastic pad serves as a kind of stopper for the end of the cuff and does not allow it to move, which is very favorable, and does not provoke delamination.

When disassembling, the inner cover with a needle is detached from the body and, when removed due to adhesion, pulls a charge, which is held both by the adhesion force of the charge and the body, and by supporting the end of the charge on the outer cover and its step girdle. The elastic gasket serves as an additional damper between the charge and the cover.

The choice of the width of the belt of the outer cover allows you to provide such a contact surface with the charge, in which the entire effort of removing the needle without taking into account the adhesion of the fuel to the body does not create compression stresses at the end of the charge that exceed the allowable for this fuel. Our studies have shown that these stresses should not exceed 80% of the compressive strength of the fuel, and on this basis it is necessary to choose the width of the girdle.

This eliminates the possibility of delamination of the fuel from the body when removing the inner cover with a needle.

When removing the outer cover, significant force impact on the charge does not occur.

Claims (2)

1. A device for forming a channel charge from a mixed rocket solid fuel, comprising a housing with a cuff, a cover with a protrusion included in the cuff groove, characterized in that the cover is made of two parts with a concentric connector and the possibility of their mutual axial movement and formation on the outside the cover of the stepped girdle, while the cuff is additionally equipped with an elastic gasket adjacent to the girdle, and the outer and inner covers are rigidly and separately fixed to the body of the product. 2. A device for forming a channel charge from a mixed rocket solid fuel according to claim 1, characterized in that the width of the belt is performed so that the stress in the fuel in the zone of contact with the belt during disassembly with a given force is not more than 80% of the tensile strength fuel compression.

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