JPH09292026A - Very high pressure light tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a weight of a very high pressure light tank. SOLUTION: A tank consists of a thin wall ductile material made liner 2 having a base while having an air-tight property formed by a means of welding in a nearly spherical shape, and a fiber reinforced plastic material arranged on the liner 2 integratedly therewith. In this case, the joining line of welding B is arranged on a position apart from the base 1 for a prescribed distance, a wall thickness is formed thinner gradually toward the welding line, and deformation of each part of the fiber reinforced plastic material 5 is nearly uniformalized so as to arrange a fiber layer in a multilayer and superposingly. In the outer peripheral surface of the spherical shaped liner 2, the wall thickness is formed equally in a range 1 near the base, a gradient thereof is set to 1/4 to 1/35 in a range 2, a gradient thereof is set to 1/120 and less in a range 3, the wall thickness is thinned gradually toward an outer, and multilayers are laminated in order so as to uniformalize deformation of each part and flow of stress.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultra-high pressure lightweight tank applied to a high-pressure gas tank of an attitude control device for satellites and rockets, a high-pressure gas tank of a flying vehicle, etc., which requires ultra-high pressure and severe weight reduction.

[0002]

2. Description of the Related Art A spherical tank 6 made of titanium alloy shown in FIG. 4 has been used as a high-pressure gas tank of conventional attitude control devices for satellites and rockets. In the figure, 1 is a mouthpiece, 7 is a fixture, and B and C are welding points.

[0003]

The high-pressure gas tank of the attitude control device for satellite uses titanium alloy, which has the highest specific strength among the metallic materials, but the weight occupancy rate in the device is still 20%. high. The weight of satellites is managed in gram order, and the merit of weight saving is very high.

When a composite material having a higher specific strength is used to reduce the weight, there are the following problems. High precision airtightness is required for a long time (about 3 years). Sufficient strength against severe vibration and acceleration when launching a rocket is required.

[0005]

The present invention employs the following means to solve the above-mentioned problems. That is, the ultra-high pressure lightweight tank of the present invention comprises a liner made of a thin ductile material having an airtightness, which is welded and formed in a substantially spherical shape with a base, and a fiber-reinforced plastic material arranged on the liner and integrated. In the constructed ultra-high pressure lightweight tank, the joint line of the welding is arranged at a position separated from the mouthpiece by a predetermined distance, and the wall thickness gradually decreases from the mouthpiece toward the same weld line and each part of the fiber-reinforced plastic material It is characterized in that a plurality of fiber layers are superposed and arranged so that the deformation is substantially uniform.

In another ultra-high pressure lightweight tank of the present invention, the wall thickness is reduced on the outer peripheral surface of the spherical liner along the geodesic line of the liner with the axis of the die as a reference, as the fiber reinforced plastic material is separated from the die. It is characterized in that it is sequentially wound into multiple layers and integrated to form a composite material, and the arrangement and thickness distribution of the fibers are set so that the displacement in each part of the fiber reinforced plastic material is uniform.

In still another ultra-high pressure lightweight tank of the present invention, on the outer peripheral surface of the spherical liner, the region 1 near the mouthpiece has the same thickness and the region 2 next has a gradient of 1/4 to 1/35, The region 3 is characterized in that the layers are sequentially laminated so as to gradually decrease toward the outer edge with a gradient of 1/120 or less and the deformation and stress flow of each part are made uniform.

Still another ultra-high pressure lightweight tank of the present invention is characterized in that the liner is a titanium alloy and the fiber-reinforced plastic material is a carbon fiber-reinforced plastic material.

In the above, the thickness of the liner of the die where stress concentrates gradually decreases as it moves away from the die, so that the stress flow is made uniform. Further, since the welding line portion where stress is likely to be concentrated is also separated from the die by a predetermined distance, the degree of concentration is reduced.

Further, the fibers of the fiber-reinforced plastic which is the composite material are arranged so that the deformation of each part is substantially uniform. Therefore, each part is uniformly deformed, and the stress is evenly distributed. As described above, it has airtightness,
In addition, an ultra-high pressure lightweight tank that is lightened by a composite material having sufficient strength can be obtained.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. In FIG. 1, the liner 2 is a spherical body made of titanium alloy, and the die 1 is arranged on the left and right of the axis C.
A region having an apex angle of 4 ° with respect to a line connecting the center O of the tank to the axis CL of the base 1 is a region 1, and a range having an apex angle of 4 ° to 9 ° is a region 2 and a vertex of 9 ° to 90 ° Area 3 with a corner
And

The die 1 has the same thickness in the area 1, and has a gradient of 1/4 to 1/35 in the area 2, and the thickness gradually decreases as the distance from the die 1 increases. Further, at the edge B separated by 20 mm or more from the outer edge A of the region 2, the next liner member 2 is welded. Further, the outer edge C of the region 3 is welded to the liner member on the opposite side. The wall thickness of the liner 2 gradually decreases toward the outer edge C in the region 3 with a slope of 1/120 or less. As shown in FIG. 3, the gradient is defined by Δt / L from the length L of the arc and the difference Δt between the wall thicknesses at the inner and outer edges.

On the outer peripheral surface of the liner 2, with reference to the axis CL,
As shown in FIG. 2, CFRP (carbon fiber forced plastic) is sequentially wound in N layers by in-plane winding (winding along a geodesic line) and integrated to form a composite material. Therefore, although the number of laminated layers is small near the mouthpiece 1, the wall thickness is large. On the other hand, as the distance from the die 1 increases, the thickness of each layer decreases, but the number of layers increases. In consideration of these matters, the fiber arrangement and the wall thickness distribution are set so that the displacements at the respective parts are uniform.

In the above, since the wall thickness of the liner 2 in the part of the die where stress is concentrated gradually decreases as it moves away from the die, the stress flow is made uniform. In addition, since the welding line B where stress is easily concentrated is also separated from the base 1 by a predetermined distance,
Concentration is reduced.

Further, the fibers of CFRP5, which is a composite material, are distributed so that the deformation of each part is substantially uniform. Therefore, each part is uniformly deformed, and the stress is evenly distributed.

As described above, it is possible to obtain an ultra-high pressure lightweight tank which is airtight and has sufficient strength and which is approximately 40% lighter than the conventional titanium alloy by the composite material of the liner 2 and CFRP5. It was

[0017]

As described above, according to the present invention, a significant weight reduction can be obtained as compared with the conventional titanium alloy tank. Airtightness is also sufficiently maintained by the liner.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 is a diagram showing how to wind fibers of the same form.

FIG. 3 is an explanatory diagram of the same form.

FIG. 4 is a sectional view of a conventional example.

[Explanation of symbols]

 1 Clasp 2 Liner 5 CFRP 6 Titanium alloy 7 Fixing bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hisato Kato 5-717-1, Fukahori-cho, Nagasaki-shi, Nagasaki Sanhishi Heavy Industries Ltd. Nagasaki Research Institute (72) Inventor Yukumi Toyama 6 Hikoshimaenoura-cho, Shimonoseki, Yamaguchi Prefecture No. 16-1 Mitsubishi Heavy Industries Ltd. Shimonoseki Shipyard

Claims (4)

[Claims] 1. An ultra-high pressure and light weight composed of an airtight thin-walled ductile material liner that has a base and is welded in a substantially spherical shape, and a fiber-reinforced plastic material that is disposed on the liner and integrated. In the tank, the welding joining line is arranged at a position separated from the die by a predetermined distance, and the thickness gradually decreases from the die toward the welding line, and the deformation of each part of the fiber reinforced plastic material becomes substantially uniform. An ultra-high pressure lightweight tank characterized by arranging multiple layers of fiber layers. 2. The fiber-reinforced plastic material is wound around the outer peripheral surface of the spherical liner along a geodesic line of the liner with respect to the axis of the die so that the wall thickness becomes thinner as the distance from the die increases, and the fibers are integrated. 2. The ultra-high pressure lightweight tank according to claim 1, wherein the composite material is formed into a composite material, and the fiber arrangement and wall thickness distribution are set so that the displacement of each part of the fiber reinforced plastic material is uniform. 3. On the outer peripheral surface of the spherical liner, a region 1 near the die has the same thickness, and a region 1 next has a gradient 1 /.
4. The method according to claim 1, wherein the thickness is set to 4 to 1/35, and the deformation and stress flow in each part are made uniform by sequentially laminating multiple layers in the region 3 with a gradient of 1/120 or less and gradually decreasing toward the outer edge. High pressure lightweight tank. 4. The ultra-high pressure lightweight tank according to claim 1, wherein the liner is a titanium alloy, and the fiber-reinforced plastic material is a carbon fiber-reinforced plastic material.