RU118365U1 - SOLID ROCKET FUEL CHARGE - Google Patents

Abstract

The solid propellant charge, armored at the end, contains a body, a one-piece bottom, a deformation compensator, characterized in that the deformation compensator is made in the form of an elastic cuff, and the cuff ends with a loop that goes into the charge channel, and the end of the loop is fastened to the bottom of the body, while the length of the loop from the points of attachment with the charge and the bottom of the body ensures the movement of the end and the bottom relative to each other, without causing separation stresses in the charge.

Description

The proposed utility model relates to the field of rocket technology, namely, to the design of the bonded charge of a solid fuel rocket engine (solid propellant rocket engine) and can be widely used for cruise missiles, etc.

One of the problems when designing a solid propellant solid propellant charge having a body with an integral bottom is the reduction of the separation voltage at the end bonded to the charge body.

Known charge design according to US patent No. 3616646 C. 60-255 IPC F02K 9/04, announced March 24, 1970, published November 5, 1971, according to which a compensator for deformation of the end part (front and rear) of the charge is patented. The strain compensator provides a decrease in the voltage in the charge during operation of the solid-propellant solid propellant rocket and with deep cooling of the charge. Between the charge and the body is a layer of thermal insulation. The deformation compensator is glued to the charge in its end part and can be made of various elastomers - for example, rubber rubber. A gap is provided in the strain relief, occupying part of the thickness of the burning charge dome. An end gap does not occur in a charge with a strain compensator, which is especially often the case with a charge of a conventional design into which gases can penetrate, causing pressure peaks in the combustion chamber. By the time when the combustion front in the charge moving in the radial direction appears to be at a larger radius than the height of the gap in the strain relief, the deformation of the end region of the charge decreases. This design of the charge adopted by the authors as a prototype.

The disadvantage of this prototype design is the presence of a volumetric deformation compensator, which increases the passive weight of the solid propellant structure and worsens the quality factor, including by reducing the mass of fuel. In addition, a decrease in the end deformation outside the gap may not be sufficient, which can lead to the mechanical destruction of the charge casing.

The objective of this utility model is to optimize the mass characteristics and reduce the passive charge weight, as well as increase the reliability of its operation by eliminating the separation voltages at the end of the charge.

The technical result of the proposed utility model is achieved due to the fact that the end of the charge is reserved by a thin elastic cuff material that is not fastened to the bottom of the casing, which is a deformation compensator, which ensures free movement of the end of the charge without causing tearing stresses in it. The cuff ends with a loop, the end of which is attached to the thermal insulation layer of the one-piece body bottom. The length of the loop provides free movement of the end of the charge and eliminates the penetration of gas into the attractive space. The presence of a thin cuff armoring the end face of the charge reduces the passive weight of the charge, which almost completely eliminates the separation voltage at the end of the charge.

The essence of the utility model is presented in the figures.

Figure 1 shows the charge with a cuff and a loop, where

1 - charge;

2 - solid propellant rocket hull;

3 - one-piece bottom of the housing;

4 - a layer of thermal insulation of the bottom;

5 - elastic cuff;

6 - air gap between the layer of thermal insulation of the bottom and the cuff;

7 - cuff loop;

Figure 2 presents the cuff loop before loading, where:

8 - section of the end of the cuff loop;

9 - place of fastening the cuff with the end of the charge.

Figure 3 presents the cuff loop in the extended state due to cooling or in the presence of pressure in the combustion chamber.

The presence of a deformation compensator made in the form of an elastic cuff in the charge design provides a high fill factor of the combustion chamber, a high coefficient of mass perfection, and a low passive charge weight. The elimination of the occurrence of tear-off stresses at the end of the charge increases the reliability of the charge.

The charge of solid rocket fuel works as follows. When charge 1 is triggered by gas pressure in the housing 2, the integral bottom 3 deforms by stretching the loop 7 of the elastic cuff 5 between the point of attachment of the cuff to the end face of charge 9 and the portion of the end of the loop 8 attached to the integral bottom by thermal insulation layer 4. When deep cooling, charge 1 is axially deformed direction, decreasing in length, also stretching the loop of the cuff 7. This increases the air gap 6 between the layer of thermal insulation of the bottom and the cuff. The presence of an elastic cuff completely eliminates tear-off stresses at the end of the charge, and the loop of the cuff when stretched eliminates the ingress of hot gases into the air gap 6.

The efficiency of the charge of solid rocket fuel, in which a cuff with a loop was used, was tested at the stage of testing prototypes in the manufacture of charges at the Perm Powder Plant and fire bench tests at FSUE NIIPM.

Claims (1)

The solid rocket fuel charge, booked at the end, contains a housing, an integral bottom, a deformation compensator, characterized in that the deformation compensator is made in the form of an elastic cuff, the cuff ending with a loop extending into the charge channel and the end of the loop fastened to the bottom of the casing, the length of the loop from the fastening points with the charge and the bottom of the body provides movement of the end and bottom relative to each other, without causing tear-off stresses in the charge.