JP3401600B2 - Vacuum insulated flexible hose - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum insulated flexible hose, for example, a vacuum used for supplying liquid hydrogen, liquid oxygen, etc. from a launch pad to a rocket at the time of launching the rocket. It relates to an insulated flexible hose. 2. Description of the Related Art A vacuum insulated flexible hose for performing heat insulation by applying a vacuum between a flexible inner pipe and an outer pipe is used to maintain a predetermined distance between the inner pipe and the outer pipe. A spacer is inserted between both tubes. As the conventional spacers, there are used spacers in which ring-shaped members are arranged at appropriate intervals, or spacers which are spirally wound around an inner tube in a state where a comb-shaped strip is set up. However, a ring-shaped spacer has a large contact area and a large volume,
There was a problem that heat invaded from the outer tube to the inner tube by heat conduction. Further, in the case where a comb-shaped strip is wound, the hose sometimes falls down when the hose is bent and loses its function as a spacer. Accordingly, an object of the present invention is to provide a vacuum insulated flexible hose provided with a spacer having a structure capable of obtaining sufficient heat insulating performance and following the bending of the hose. In order to achieve the above object, a vacuum insulated flexible hose according to the present invention provides vacuum insulation between a flexible inner tube and an outer tube to provide heat insulation. In a flexible hose, a plurality of small cylindrical strips disposed at predetermined intervals in a circumferential direction between the inner pipe and the outer pipe.
The pacer block is connected by a connecting wire , and the connecting wire is wound around the inner tube in a ring shape.
A plurality of cylindrical small piece-shaped spacers wound in a ring shape
A plurality columns over blocks in the axial direction of the inner tube, small pieces spacer block or the connecting wires between adjacent said axial direction, is characterized by being connected to each other in the axial direction of the connection wires. According to the above construction, since the spacer itself is in the form of small pieces, the penetration of heat from the outer tube to the inner tube due to heat conduction can be reduced. Further, since the small spacer blocks are connected by the connecting wires, they can sufficiently cope with the bending of the hose, and do not move even if the hose is bent. In particular, a predetermined position can be secured by arranging a plurality of small-piece-shaped spacer blocks in a ring shape and further connecting a plurality of adjacent ring-shaped small-piece-shaped spacer blocks with connection wires. Therefore, by appropriately setting the size and arrangement interval of each piece-shaped spacer block in accordance with the diameter of the hose and the minimum bending radius, it is possible to maintain necessary and sufficient heat insulation and flexibility while maintaining the interval between both pipes. Obtainable. An embodiment of the present invention will be described below. FIG.
FIG. 3 is a cross-sectional view illustrating a structure of a vacuum insulated flexible hose. A metal blade 2 for imparting rigidity to the inner tube 1 is mounted on the outer periphery of the flexible inner tube 1 having a bellows structure, and a super-insulation for heat reflection is further provided on the outer periphery of the metal blade 2. 3 is wound. The outer tube 4 into which the inner tube (hereinafter sometimes referred to as including super insulation 3) 1 is a flexible tube having a bellows structure similar to the inner tube. , A spacer 5 between the inner pipe 1 and the outer pipe 4.
Is provided, and holds a space serving as a vacuum heat insulating layer. The inner tube 1 and outer tube 4 of a vacuum insulated flexible hose for supplying a rocket with a low-temperature liquefied gas or the like are usually formed by processing a corrosion-resistant metal material such as stainless steel. The end of the outer tube 4 (not shown) and the outer periphery of the end of the inner tube 1 are hermetically sealed by a known method such as welding via a heat insulating tube or the like. The spacer 5 is formed by connecting a plurality of small columnar spacer blocks 10 at a substantially constant interval by a connecting wire 20. The spacer 5 is provided on the outer periphery of the superinsulation 3 at a substantially constant interval in the axial direction. It is wound and the axial position is fixed by the connection wire 21. As shown in FIG. 2, the small piece spacer block 10 has a circumferential groove 11 formed in the center of a columnar member, and a through hole 12 formed in the groove 11.
It is preferably formed of a material having a low coefficient of friction and a heat insulating property, for example, a fluororesin such as polytetrafluoroethylene. The length of the cylinder in the axial direction is determined by the length of the inner tube 1.
By setting it longer than the pitch of the unevenness of the bellows,
It is possible to prevent the ring-shaped connection from entering the valley portion of the bellows. As shown in FIG. 3, a connecting wire 20 for connecting the small piece spacer block 10 is inserted into the through hole 12 from one end of the through hole 12 and exits from the other end of the through hole 12. It goes around the inside of the concave groove 11 halfway and is inserted again into the through hole 12 from the same direction. The plurality of small spacer blocks 10
By sequentially attaching the connection wires 20 as described above, the connection is made at substantially constant intervals as shown in FIG. The spacers 5 formed by connecting the small piece spacer blocks 10 at substantially constant intervals in this manner are:
As shown in FIG. 5, it is wound around the outer circumference of the inner tube 1, and the ends of the connection wire 20 are connected to each other and fixed in a ring shape. Further, as shown in FIG. 1, a plurality of rows of the spacers 5 are arranged on the outer periphery of the inner tube 1 at substantially constant intervals in the axial direction, and the spacers 5 are connected by connecting wires 21. To restrict axial movement. The spacer 5 having such a structure is connected to the inner tube 1.
By providing the space between the outer tube 4 and the outer tube 4, the portion in contact with both tubes is the outer peripheral surface of the small spacer block 10, and by forming the small spacer block 10 in a cylindrical shape, Since the contact portion between the pipe 10 and the two pipes is in linear contact, the penetration of heat from the outer pipe 4 to the inner pipe 1 due to heat conduction can be greatly reduced. Each of the small piece spacer blocks 10
Are connected by a connecting wire 20, and furthermore, each spacer 5 is connected by a connecting wire 21,
The hose can sufficiently cope with bending, and does not move even if the hose is bent. Therefore, by appropriately setting the size and the arrangement interval of each small piece spacer block 10 according to the diameter of the hose and the minimum bending radius, it is possible to maintain the interval between the two tubes and to provide a necessary and sufficient heat insulating property and bending. Sex can be obtained. [0022] tail, vinegar pacer block, spherical, it may be appropriately used the rugby ball-shaped pieces shaped spacer block. As described above, in the vacuum insulated flexible hose of the present invention, spacers composed of a plurality of small-piece spacer blocks are provided at predetermined intervals between the inner tube and the outer tube. The heat insulation and the flexibility required for the hose can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a vacuum insulated flexible hose showing one embodiment of the present invention. FIG. 2 is a front view of a small piece spacer block. FIG. 3 is a sectional view taken along the line III-III of FIG. 2; FIG. 4 is a front view showing a state in which small piece-shaped spacer blocks are connected. FIG. 5 is a cross-sectional view showing a state in which a spacer is wound around the outer circumference of an inner tube. [Description of Signs] 1 ... Inner tube, 4 ... Outer tube, 5 ... Spacer, 10 ... Small piece spacer block, 11 ... Concave groove, 12 ... Through hole, 20 ... Connection wire, 21 ... Connection wire

Continued on the front page (72) Inventor Hisae Momose 10 Oecho, Minato-ku, Nagoya-shi, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Nagoya Aircraft Works (72) Inventor Masanobu Hirano 10 Oecho, Minato-ku, Nagoya-shi, Aichi Mitsubishi Heavy Industries, Ltd. Inside Nagoya Aircraft Works (72) Inventor Hideyuki Waki 6-2 Kojimacho, Kawasaki-ku, Saiwai-ku, Kawasaki City, Kanagawa Prefecture Inside (72) Inventor Tatsuya Hoshino 6-2 Kojimacho, Kawasaki-ku, Saiwai-ku, Kawasaki City, Kanagawa Prefecture (56) References JP-A-60-101391 (JP, A) Jiko 30-11986 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16L 59 / 00-59/22

Claims (1)

(57) [Claim 1] In a vacuum insulated flexible hose for performing heat insulation by evacuating a space between a flexible inner tube and an outer tube, a circumference is provided between the inner tube and the outer tube. disposed of at predetermined intervals in the direction
Wire connecting multiple cylindrical strip spacer blocks
And connect the connecting wire to the outer circumference of the inner pipe.
And wound in a ring shape.
Multiple cylindrical small spacer blocks in the axial direction of the inner tube
Row, and the strip-shaped spacer blocks adjacent in the axial direction.
The connection wires in the axial direction.
Vacuum insulated flexible hoses which are connected to each other by a wire .