RU2453721C2 - Rocket engine inserted solid-propellant face-combustion charge - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: rocket engine inserted solid-propellant face-combustion charge is armored on sides and front end face and comprises rubber-metal scuff plate and, at least, three round keys. Said scuff plate comprises steel disk and shaft with central through bore arranged on charge front end face. Keys are arranged regularly along central trough bore of the shaft with clearance between scuff plate and propellant element through which charge is armored. Keys are made from armoring coat material while steel disk is provided with pin.

EFFECT: simplified production, higher reliability.

2 dwg

Description

The patented invention relates to an end-to-end combustion charge and can be used in the design, development, and manufacture of charges from solid fuel to rocket engines.

Known designs of plug-in end-face charges made in the form of a channelless monoblock of cylindrical shape, armored along the side surface and front end. Such charges are freely inserted into the combustion chamber and are fixed in it by means of a mounting unit located between the front bottom of the combustion chamber and the armored end of the charge. In this case, the attachment point is glued with an intermediate fastening adhesive composition to the front end of the charge or screwed to it with screws. On the opposite side, the attachment unit joins the engine cover with a threaded shank, such as, for example, according to US patent No. 2479828, class. 102-98, filed November 20, 47, and the patent of Germany No. 2117401, class. F02K 9/04, published on March 29, 73, or using a special profile insert, such as, for example, according to the FRG patent No. 1128344, class. 78d, claimed October 7, 1965

The main disadvantages of such designs are: firstly, the lack of a solution to the problem of simultaneously gluing the mount and applying the armor coating on the end-face charge during the manufacturing process. Secondly, the technological complexity of fastening the front end of the charge to the mount, which does not guarantee failure-free operation of the charge under the action of operational loads: temperature drop, vibration, shock action of overloads, including axial overloads with the direction towards the nozzle bottom, acting when the rocket is ejected from starting devices, etc., since the fastening is carried out using intermediate elements having different physical and mechanical (FMX) with an armor coating and fuel, thermal strong and strength characteristics. Moreover, for bonding, it is necessary to develop a special technological process and materials for gluing, since charge reservation and gluing of the attachment site are carried out separately.

As a prototype of the invention, the design of the attachment node, corresponding to the description of US patent No. 2479828, class. 102-98, filed Nov. 20, 477, published Aug. 23, 1949

The disadvantage of this design is the presence of an intermediate adhesive connection for fastening the front end of the charge to the mount, which degrades the performance of the charge due to the manifestation of dangerous stress concentrations at the junction due to the difference in FMX, thermal and strength characteristics of the layer "mount node-adhesive joint-armor plating- fuel".

An object of the invention is to simplify the manufacturing technology of the charge by combining the operations of booking a fuel cell charge and fastening it using a rubber plate, which improves the performance when exposed to external factors.

The solid-propellant solid-propellant end-face charge of the rocket engine, armored along the side surface and the front end, contains a rubber-metal plate consisting of a steel disk and a shank with a central through hole located on the side of the front end of the charge. In accordance with the invention, the charge is equipped with “crackers” of round shape, at least three pieces, evenly installed around the central through hole of the shank, with a gap between the plate and the fuel element through which the charge is reserved, while “crackers” are made of material of the same composition as the armor coating, and the steel disk is equipped with a finger.

The technical result of the present invention is a combination of a rubber-metal plate consisting of a steel disk pressed into rubber and a shank with a central hole for supplying the armor mass located on the front end side, and “crackers” guaranteeing uniform distribution, thickness and withdrawal of the armor mass on the side surface and front end of the charge when booking. In this case, the shape of the “crackers”, their location and the change in the orifice of the hole in the shank creates the possibility of regulating the flow of the armor mass and changing the technological modes of booking the charge and gluing the attachment point to it. The manufacture of “crackers” from material of the same composition as the armor coating, but previously cured, reduces contact stresses at the junction of crackers with the armor coating and accelerates the charge manufacturing process.

Figure 1 shows the attachment unit of the solid-state plug-in end-face combustion charge in the combustion chamber of a rocket engine:

1 - steel disk;

2 - a shank with a central through hole;

3 - finger;

4 - rubber plates;

5 - fuel cell charge;

6 - “crackers”;

7 - air gap to fill the booking mass.

Figure 2 presents a diagram of the fastening of the charge in the combustion chamber of a rocket engine:

8 - armor coating;

9 - charge with a mount;

10 - rocket engine housing;

11 - front bottom of the combustion chamber of a rocket engine.

The rubber-metal plate is a steel disk (1) with a shank (2) and a finger (3), pressed into the rubber of the plate (4). On the side of the plate mounting to the charge fuel cell (5), the rubber has a plate shape. In the shank (2), a through central hole is made for supplying an armor composition through it. Between the inner surface of the plate (4) and the end of the fuel cell charge (5) before booking, an air gap (7) is provided by at least three round “crackers” (6) made of the same material as the armor coating (8), pre cured. "Rusks" (6) are arranged evenly around the circumference on the inner surface of the plate (figure 1).

In the process of booking a fuel element (5), the armor mass is fed through an opening in the shank into the air gap (7) formed by the plate (4) and the front end of the fuel element (5) by means of “crackers” (6). During curing of the armor mass, the plate (4) is simultaneously glued to the fuel element (5) and the fuel element is booked. "Crackers" made from the material of the armor plating, during the polymerization of the armor plating, form a reliable uniform armor plating layer on the front end.

The finger (3) provides fixation of the charge (9) in the combustion chamber from rotation. Using the shank (2), the charge is attached to the front bottom (11) of the combustion chamber of the rocket engine (figure 2). Thus, the rubber-metal plate reliably fixes the charge in the combustion chamber of a rocket engine through fastening with armor plating of the front end of the charge.

The advantage of the proposed design is the simplification of manufacturing technology, the exclusion of intermediate adhesive bonding, reducing the range of materials used and increasing the efficiency of the charge.

The proposed method of securing a solid-state end-face solid-fuel charge using a rubber-metal plate in a rocket engine was successfully applied when practicing a number of charges at the FKP PPZ and OCHZ FSUE NII PM.

Claims (1)

Insert solid propellant end-face charge of a rocket engine, armored on the lateral surface and front end, containing a rubber-metal plate consisting of a steel disk and a shank with a central through hole located on the front of the front end of the charge, characterized in that the charge is provided with “crackers” of round shape less than three pieces evenly installed around the central through hole of the shank, with a gap between the plate and the fuel element through which the armored e charge, the "biscuit" made of a material of the same composition as the Book coating and steel disk is provided with a finger.

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