JP3257659B2 - Pressure vessel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure vessel made of fiber-reinforced plastic used for a rocket motor case, for example.

[0002]

2. Description of the Related Art FIG. 4 is a view showing an end of a rocket motor case, which is a pressure vessel, on a nozzle mounting side. The rocket motor case 100 has a substantially spherical shape, and has a case body 101 made of fiber-reinforced plastic molded based on a filament winding method. An annular reinforcing member 102 is attached.

Further, such a rocket motor case 1
In the case of 00, stress concentration occurs on the case body 101 side due to an increase in internal pressure at a contact portion between the case body 101 and the reinforcing member 102. Rubber layer 1
03 is provided.

In the rocket motor case 100, a reinforcing member 102 having a rubber layer 103 is attached to a mandrel corresponding to the shape of the inside of the case, and a continuous fiber is wound around these surfaces to form the case body 101. However, at this time, generally, the adhesion between the rubber layer 103 and the fiber reinforced plastic formed based on the filament winding method is not so good.
A sheet 1 made of fiber-reinforced plastic is previously formed on the rubber layer 103.
04 is vulcanized and the fibers are wound around the sheet 104 so that sufficient adhesion to the case body 101 can be obtained.

[0005] Such a rocket motor case 100 is described, for example, in Japanese Patent Application No. 3-57869.

[0006]

By the way, the rocket motor case is subjected to a pressure resistance test for applying an internal pressure before use.
In this case, when an internal pressure is applied, the rubber layer 103 protrudes as indicated by the imaginary line in FIG. 4, and the rubber layer 103 may not be restored to the original state even if the pressure is removed due to shear deformation. Was.

In FIG. 5, the joint portion between the case main body 101 and the reinforcing member 102 is modeled and described. When the rubber layer 103 is pushed from the vertical direction in FIG. 5, the rubber layer 103 has a Poisson's ratio. Since it is large and has strong incompressible behavior, it tends to easily expand in the in-plane direction, which is the horizontal direction in FIG.

Therefore, the conventional rocket motor case 1
In the case of 00, after the pressure test, there is a problem that dimensions inside and outside of the case become small due to shear deformation of the rubber layer 103, which does not lead to a functional defect but is not preferable in quality. That was the challenge.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems. In a pressure vessel made of a fiber-reinforced plastic having a reinforcing member attached along the periphery of an opening, a container body and a reinforcing member are provided. It is an object of the present invention to provide a pressure vessel capable of preventing a shear deformation of a rubber layer during the pressure vessel.

[0010]

According to a first aspect of the present invention, there is provided a pressure vessel made of a fiber-reinforced plastic having a reinforcing member attached to a periphery of an opening.
A rubber layer is provided between the inner surface of the container body and the reinforcing member, and a reinforcing layer made of fiber-reinforced plastic is provided in the middle of the rubber layer. The above configuration is a means for solving the problem.

[0011]

In the pressure vessel according to the first aspect of the present invention, the restraining surface of the rubber layer is enlarged by the reinforcing layer, so that the rubber layer is prevented from being sheared, and the reinforcing layer is made of a fiber-reinforced plastic. Therefore, improvement in moldability and adhesiveness, reduction in weight, and the like are achieved.

Further, in the pressure vessel according to claim 2 of the present invention, the rubber layer is prevented from being sheared and deformed by the reinforcing layer, and when used as a rocket motor case, the laminated portion of the rubber layer and the reinforcing layer is used for the nozzle. It can be used as a flexible joint for performing a swing motion.

[0013]

FIG. 1 is a view for explaining an embodiment of a pressure vessel according to claims 1 and 3 of the present invention. Here, a rocket motor case is exemplified as the pressure vessel.

The rocket motor case 1 has a substantially spherical shape, and includes a case body (container body) 2 made of fiber-reinforced plastic molded based on a filament winding method. (Left side in FIG. 1) and tail portions (right side in FIG. 1) have openings 3 and 4,
Annular reinforcing members 5, 6 along the inner periphery of the openings 3, 4
Is installed.

Another closing member is attached to the head side opening 3 later, and a propulsion nozzle is attached to the tail side opening 4. The reinforcing members 5 and 6 are formed of metal or fiber-reinforced plastic, and a heat insulating material corresponding to the combustion temperature of the solid fuel is provided on the inner surface thereof. Care has been taken not to raise it above.

A rubber layer 7 is provided between the case main body 2 and the reinforcing member 6 at the contact portion between the case main body 2 and the reinforcing members 5 and 6, as shown in an enlarged view of the tail portion in FIG. Further, a reinforcing layer 8 made of a fiber reinforced plastic member is provided between the rubber layers 7.

The rubber layers 7, 7 divided into two parts have a total thickness dimension substantially equal to the thickness dimension of the conventional rubber layer (see FIG. 4), thereby making the rigidity equivalent to the conventional case. The thickness is such that stress concentration generated in the case main body 2 when a pressure is applied can be sufficiently reduced. On the other hand, the reinforcing layer 8
Is pressed by the rubber layers 7 and 7 in a direction along the surface when pressed, and thus has a thickness dimension that ensures sufficient strength to cope with the force. The rubber layers 7, 7 and the reinforcing layer 8 are vulcanized and bonded.

Here, in the rocket motor case 1, a reinforcing member 6 (5) having a rubber layer 7 and a reinforcing layer 8 is attached to a mandrel corresponding to the shape inside the case, and continuous fibers are wound around these surfaces. By the case body 2
At this time, a fiber-reinforced plastic sheet 9 is bonded to the outer rubber layer 7 by vulcanization in advance, and the fiber is wound on the sheet 9 so that sufficient contact with the case body 2 is achieved. Adhesiveness is obtained.

The rocket motor case 1 having the above-described structure is described by modeling a joint portion between the case body 2 and the reinforcing member 6 in FIG. 2. When the rubber layer 7 is viewed from the vertical direction in FIG. When the rubber layer 7 is pushed to extend in the in-plane direction, which is the left-right direction in FIG. 2, the reinforcing layer 8 made of fiber-reinforced plastic does not extend in the in-plane direction. As a result, the shear deformation of the rubber layer 7 is prevented.

Therefore, even when the rocket motor case 1 of the above embodiment is subjected to a pressure test in which an internal pressure is applied, the rubber layer 7 is only elastically deformed and does not undergo shearing deformation. Very good quality is maintained, since the inner and outer dimensions are never reduced.

FIG. 3 is a view for explaining an embodiment of the pressure vessel according to claims 2 and 3 of the present invention. In this embodiment, a rocket motor case is illustrated as the pressure vessel.

The rocket motor case 11 has four rubber layers 7 and three reinforcing layers between the case body 2 and an annular reinforcing member 6 provided along the inner periphery of the opening 4 on the tail side thereof. 8 is provided.

Each of the rubber layers 7 does not necessarily have to have the same thickness, but in this embodiment, each has almost the same thickness. Each reinforcing layer 8 is made of a member made of fiber reinforced plastic, and has substantially the same thickness. These rubber layer 7 and reinforcing layer 8
Are vulcanized and adhered to each other, and a sheet 9 made of fiber reinforced plastic is applied to the surface of the outer rubber layer 7 in order to improve the adhesion to the case body 2 formed based on the filament winding method. It is sulfuric acid bonded.

In the rocket motor case 11 having the above structure, the rubber layer 7 is prevented from being sheared and deformed by the reinforcing layer 8 and the propulsion nozzle is attached to the reinforcing member 6 as in the previous embodiment. In the state, the nozzle can be swung by the elastic deformation of each rubber layer 7. That is,
The joint portion composed of the rubber layer 7 and the reinforcing layer 8 can be used as a flexible joint of the movable nozzle.
In this case, the thickness of each reinforcing layer 8 is made larger than that of the above-described embodiment, so that the reinforcing layer 8 has sufficient strength to cope with the pressure received during the swinging movement of the nozzle.

[0025]

As described above, according to the pressure vessel according to the first aspect of the present invention, in the pressure vessel made of fiber reinforced plastic in which the reinforcing member is attached along the periphery of the opening, the reinforcing layer is used. Since the constraining surface of the rubber layer between the container body and the reinforcing member is in an enlarged state, it is possible to secure a thickness dimension of the rubber layer capable of sufficiently relaxing the stress concentration of the container body, and further, it is possible to secure the rubber layer. Can be prevented, and good quality can be maintained even after a pressure test. Further, by employing a fiber reinforced plastic for the reinforcing layer, the moldability of the reinforcing layer and the adhesiveness to the rubber layer can be further improved, and furthermore, the weight can be reduced.

According to the pressure vessel according to the second aspect of the present invention, as in the first aspect, the rubber layer is prevented from being sheared and deformed by the reinforcing layer. The laminated portion of the reinforcing layer can be used as a flexible joint for performing the swing motion of the nozzle.

[0027]

[Brief description of the drawings]

FIG. 1 is a sectional view illustrating a rocket motor case as one embodiment of a pressure vessel according to claims 1 and 3 of the present invention.

FIG. 2 is a cross-sectional explanatory view modeling a joint portion between a case body and a reinforcing member in FIG. 1;

FIG. 3 is a sectional view illustrating an open end of a rocket motor case as an embodiment of the pressure vessel according to claims 2 and 3 of the present invention.

FIG. 4 is a cross-sectional view illustrating an open end of a rocket motor case as a conventional pressure vessel.

FIG. 5 is a cross-sectional explanatory view modeling a joint portion between a case body and a reinforcing member in FIG. 4;

[Explanation of symbols]

 1 11 Rocket motor case (pressure vessel) 2 Case body (vessel body) 4 Opening 6 Reinforcement member 7 Rubber layer 8 Reinforcement layer

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-57869 (JP, A) JP-A-3-124946 (JP, A) JP-A-64-35134 (JP, A) JP-A-57-57 16239 (JP, A) JP-A-5-256196 (JP, A) JP-A-6-1415 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F02K 9 / 32-9 / 34 F16J 12/00 F02K 9/60

Claims (2)

(57) [Claims] 1. A fiber-reinforced plastic pressure vessel having a reinforcing member attached to the periphery of an opening, comprising a rubber layer between an inner surface of a container body and the reinforcing member, and a fiber interposed between the rubber layers. A pressure vessel comprising a reinforcing layer made of reinforced plastic. 2. The pressure vessel according to claim 1, comprising a plurality of reinforcing layers.