JP3477807B2 - Low temperature gas piping - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low temperature gas pipe.

[0002]

If BACKGROUND ART delivering the cold gas, usually, 5
As shown in, a pipe having a heat insulating material on the outside is used.

However, when the heat insulating material 2 is provided on the outside of the pipe 1, since the pipe 1 directly contacts the low temperature gas, the pipe 1 may be cracked due to low temperature brittleness. Material must be used.

Therefore, as shown in FIG. 6 , by providing a heat insulating material 2 inside the pipe 1, the pipe 1 is kept at room temperature so as not to come into direct contact with the low temperature gas.
Even if it is a normal material such as iron, it is possible to prevent the occurrence of cracks due to low temperature brittleness.

In this case, it is general that polyurethane foam or the like is used as the heat insulating material 2, and the heat insulating material 2 is bonded and fixed on the entire surface inside the pipe 1.

[0006] In the figure, 3 is an adhesion portion between the pipe 1 and the heat insulating material 2.

[0007]

However, the piping 1
When the heat insulating material 2 is provided so as to be adhered to the entire inside of the above, there are the following problems.

That is, the heat insulating material 2 such as polyurethane foam can exhibit the heat insulating effect without any problem when the temperature difference between the inner and outer surfaces is about 100 degrees or less, but the temperature difference between the inner and outer surfaces is more than 100 degrees. When it becomes large, as shown by the phantom line in FIG. 6 , shrinkage occurs on the low temperature side of the heat insulating material 2 such as polyurethane foam, and the heat insulating material 2 is bonded to the entire surface of the pipe 1 to restrain the deformation. Therefore, the heat insulating material 2 is cracked due to the contraction and deformation, which causes a problem that the heat insulating property cannot be exhibited.

In view of the above situation, it is an object of the present invention to provide a low temperature gas pipe which can prevent cracks from occurring in the heat insulating material when the heat insulating material is attached to the inside of the piping. Is.

[0010]

SUMMARY OF THE INVENTION According to the present invention, a plurality of heat insulating material blocks bent into a cylindrical surface along a pipe are arranged in the inner circumferential direction of the pipe with a gap between them. In addition, a plurality of rows are arranged in the longitudinal direction of the pipe with a gap between each other, each heat insulating material block is fixed to the pipe side at one point in the central portion, and a fibrous heat insulating material is laminated , In the state of being compressed in the stacking direction, in the gap between the heat insulating material blocks,
Filling and inserting in the compression direction toward the width direction of the gap, between the end faces of the adjacent heat insulating material blocks, and between the longitudinal side portions and the circumferential side portions of the inner peripheral surface of the adjacent heat insulating material blocks. , A band-shaped sealing member for sealing the gap portion is provided with a slack portion, some of the sealing members are provided with ventilation holes , and a heat insulating material is provided in one layer in the pipe.
There are a plurality of heat insulating material block, between the heat insulating material blocks adjacent in the circumferential Direction, a gap portion of the two-stage consisting of narrow gap portion of the inner peripheral side of the wide gap portion and the outer peripheral side, wide gap A heat insulating material plate having a width smaller than that of the wide gap portion is arranged in the step portion between the narrow gap portion and the narrow gap portion, and the laminated heat insulator is filled and inserted in the wide gap portion in the compression direction toward the width direction of the wide gap portion. In addition, the present invention relates to a low-temperature gas pipe characterized in that a laminated heat insulator is filled and inserted in the narrow gap portion with the compression direction being directed in the radial direction of the pipe.

In this case, the laminated heat insulating body may be formed by alternately laminating the fibrous heat insulating material and the convection suppressing membrane member.

[0012]

[0013]

[0014]

The operation of the present invention is as follows.

Since the pipe is kept at room temperature by providing the heat insulating material inside the pipe through which the low temperature gas flows, it is possible to prevent the low temperature gas from directly contacting the pipe and damaging the pipe.

In this case, the heat insulating material is composed of a heat insulating material block, and a plurality of heat insulating material blocks are arranged with a gap in each of the inner peripheral direction and the longitudinal direction of the pipe, and each heat insulating material block is provided at one point in the central portion. By fixing the heat insulating material block to the pipe side, each heat insulating material block can be freely deformed. Therefore, even when the heat insulating material block is contracted by the low temperature gas, the heat insulating material block is prevented from being damaged.

Further, a band-shaped sealing member for sealing a gap between end faces of adjacent heat insulating material blocks, and between side portions in the longitudinal direction and between side portions in the circumferential direction on the inner peripheral surface of the adjacent heat insulating material blocks. By providing a slack part and attaching it,
The low temperature gas is prevented from entering the gap between the heat insulating material blocks while permitting the deformation of the heat insulating material blocks.

At this time, the pressure inside and outside the heat insulating material is made uniform by providing ventilation holes in some of the sealing members.

Further, in a state in which a laminated heat insulating body in which fibrous heat insulating materials and convection suppressing film members are alternately laminated is compressed in the laminating direction, the width of the gap in the compression direction is set in the gap between the heat insulating material blocks. When the low temperature gas entering the gap is prevented from convection inside the gap by filling and inserting in the direction, and the size of the gap between the heat insulating blocks changes due to deformation of the heat insulating block. However, the laminated heat insulator can expand and contract and follow it.

When the above structure is implemented with a single layer of heat insulating material, a two-step gap portion is formed between the heat insulating material blocks adjacent to each other in the circumferential direction, and a wide gap portion on the inner peripheral side and a wide gap portion on the outer peripheral side are formed. Blocking the step with the narrow gap with a heat insulating material plate having a width smaller than that of the wide gap, and inserting the laminated heat insulator into the wide gap with the compression direction facing the width of the wide gap. This allows the laminated heat insulator to expand and contract to follow the change in the gap in the wide gap portion, and by filling and inserting the laminated heat insulator in the narrow gap portion with the compression direction being the radial direction of the pipe. , To enhance the function of shutting off low-temperature gas from piping.

[0021]

[0022]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 4 show a first embodiment of the present invention.

An example of providing one layer of heat insulating material 5 in the pipe 4 will be described.

The heat insulating material 5 is composed of a plurality of heat insulating material blocks 6 made of rigid polyurethane foam and having a substantially rectangular shape of a predetermined size.

The heat insulating material block 6 is bent into a cylindrical surface along the pipe 4, and the heat insulating material block 6 is provided with a wide gap portion 7 on the inner peripheral side and a narrow gap portion 8 on the outer peripheral side between them. A plurality of stepped gap portions 9 are arranged in the circumferential direction 10 of the inner circumference of the pipe 4.

Similarly, the heat insulating material blocks 6 are arranged in a plurality of rows in the longitudinal direction 12 of the pipe 4 with a gap portion 11 between them.

At this time, if necessary, the phase of the heat insulating material block 6 may be shifted between the rows.

Then, each heat insulating material block 6 is adhered and fixed to the pipe 4 side at one point in the central portion using an adhesive or the like.

In the figure, 13 is an adhesive fixing portion between the heat insulating material block 6 and the pipe 4.

Next, a heat insulating material plate 14 having a smaller width dimension than the wide gap portion 7 is arranged at the step between the wide gap portion 7 and the narrow gap portion 8.

On the other hand, fibrous heat insulating material 15 such as ceramic fiber or glass wool and convection suppressing membrane member 16 such as polyethylene terephthalate are alternately laminated to provide laminated heat insulators 17 to 19. 19
Is in a compressed state in the stacking direction.

For the wide gap portion 7, the compression direction is the width direction 20 of the wide gap portion 7 (the circumferential direction 10 of the pipe 4).
The laminated heat insulator 17 is filled in and inserted into the narrow gap portion 8 and the laminated heat insulator 18 is inserted into the narrow gap portion 8 in the radial direction 21 of the pipe 4.

Further, the laminated heat insulating body 19 is filled and inserted into the gap portion 11 between the heat insulating material blocks 6 between the rows so that the compression direction is the longitudinal direction 12 of the pipe 4.

The longitudinal direction 12 of adjacent heat insulating material blocks 6
A band-shaped sealing member 22 formed by coating glass cloth with aluminum for sealing the gap 9 between the end faces of the
Paste.

Similarly, in order to seal the gap 11 between the sides in the longitudinal direction 12 or between the sides in the circumferential direction 10 on the inner peripheral surface of the adjacent heat insulating material block 6, the glass cloth is coated with aluminum. Band-shaped seal members 23, 24
Paste.

The seal members 23 and 24 are provided with a required slack portion 26 in order to correspond to the shrinkage of the heat insulating material block 6.
Be provided.

Further, although the seal members 22 to 24 are attached with a gap in the drawing, in reality, the seal members 22 to 24 are attached so that there is no gap.

Further, ventilation holes 25 are provided in some of the sealing members 22 to 24.

It is preferable that a very small number of the ventilation holes 25 are provided in the upper half of the pipe 4.

Next, the operation will be described.

In the present invention, the low temperature gas flows in the longitudinal direction 12 along the heat insulating material 5 provided inside the pipe 4.

As described above, by providing the heat insulating material 5 on the inner side of the pipe 4, the low temperature gas is prevented from directly contacting the pipe 4, and the pipe 4 is kept at room temperature. The generation of cracks is prevented, and it is not necessary to use a high-grade material that is resistant to low temperature brittleness as the pipe 4.

At this time, the heat insulating material 5 is composed of a plurality of heat insulating material blocks 6. However, since the various sealing members 22 to 24 are attached between the adjacent heat insulating material blocks 6, the low temperature gas is kept in the heat insulating material block 6. It is prevented that the gaps 9 and 11 between the gaps and the low-temperature gas that has entered the gaps 9 and 11 convect the gaps 9 and 11 in the circumferential direction 10 and the longitudinal direction 12, and thus, inside the pipe 4. It becomes possible to feed the low temperature gas without any trouble.

However, if the gaps 9 and 11 are completely sealed, a pressure difference will be generated between the inside and outside of the heat insulating material 5, so that the sealing members 22 to
A very small number of ventilation holes 25 are provided in 24.
The ventilation hole 25 is provided in the upper half of the pipe 4 so that the low temperature gas is unlikely to enter the gaps 9 and 11.

Then, the low-temperature gas slightly entering from the ventilation holes 25 is discharged from the laminated heat insulators 17 provided in the gaps 9 and 11.
The convection is blocked by 19 and contact with the pipe 4 is prevented.

In particular, in the laminated heat insulators 17 to 19, since a large number of convection suppressing film members 16 are interposed, a high convection suppressing effect can be obtained.

When a low-temperature gas such as a low-temperature nitrogen gas vaporized from liquid nitrogen, such as a low-temperature nitrogen gas at a temperature of about minus 100 degrees or less, flows through the inside of the pipe 4, the inside and outside surfaces of the heat insulating material block 6 are covered. Since the temperature difference is 100 degrees or more,
The inner surface side of the heat insulating material block 6 contracts and the heat insulating material block 6
Will be deformed similarly to the case of FIG.

Even in such a case, according to the present invention, the gap portions 9 and 11 are formed between the heat insulating material blocks 6, and each heat insulating material block 6 is bonded at one point of the central adhesive fixing portion 13 with an adhesive or the like. Since the heat insulating material block 6 is bonded and fixed to the pipe 4 side by using, the heat insulating material block 6 can be freely deformed according to the temperature gradient, and the heat insulating material block 6 is prevented from cracking.

At this time, since the seal members 23 and 24 are provided with the slack portion 26, even if the heat insulating material block 6 is deformed, the seal members 23 and 24 can follow the deformation, and the seal member 23. , 24 is prevented from destroying the sealing property.

On the inner surface side where the amount of deformation of the heat insulating material block 6 increases due to direct contact with the low temperature gas, the size of the wide gap portion 7 in the circumferential direction 10 of the adjacent heat insulating material blocks 6 changes. Is the width dimension of the heat insulating material plate 14 provided at the step between the wide gap portion 7 and the narrow gap portion 8,
Since the width is made smaller than that of the wide gap portion 7, the wide gap portion 7 and the narrow gap portion 8 can be blocked even if the gap changes, and the laminated heat insulator 17 is compressed in the wide gap portion 7 in the compression direction. Since the filling is inserted in the width direction 20 of the above, the laminated heat insulating body 17 expands and contracts according to the change in the size of the gap, and a good convection prevention effect can be maintained.

[0052]

[0053]

[0054]

[0055]

[0056]

[0057]

[0058]

[0059]

[0060]

[0061]

[0062]

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0064]

As described above, according to the low temperature gas pipe of the present invention, when the heat insulating material is provided inside the pipe, it is possible to prevent the heat insulating material from cracking. It can be effective.

[Brief description of drawings]

FIG. 1 is a schematic front view of a first embodiment of the present invention.

FIG. 2 is a partially enlarged perspective view of FIG.

FIG. 3 is a view taken along the line III-III in FIG.

FIG. 4 is a view taken along the line IV-IV in FIG.

FIG. 5 is a schematic view of a conventional example in which a heat insulating material is provided on the outer peripheral side of the pipe .
It is a side view.

FIG. 6 is a schematic front view when a heat insulating material is provided on the inner peripheral side of the pipe .
It is a figure.

[Explanation of symbols]

4 Piping 5 Thermal Insulation 6 Thermal Insulation Block 7 Wide Gap 8 Narrow Gap 9, 11 Gap 10 Circumferential Direction 12 Longitudinal Direction 13 Adhesive Fixing Part 14 Heat Insulation Plate 15 Fibrous Heat Insulation 16 Convection Suppression Membrane Member 17- 19 laminated heat insulator 20 width direction 22 to 24 sealing member 25 vent hole 26 slack portion

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Yamanishi Shin-Nakahara-cho, Isogo-ku, Yokohama-shi, Kanagawa 1st, Ishikawajima-Harima Heavy Industries Co., Ltd. (72) Inventor Masasuke Nakajima Shin-chu, Isogo-ku, Yokohama-shi, Kanagawa Haramachi No. 1 Ishikawajima-Harima Heavy Industry Co., Ltd. Technical Research Institute (72) Inventor Tatsuji Hira 1 Shin-Nakahara-cho, Isogo-ku Yokohama-shi, Kanagawa Kanagawa Prefecture Ishikawajima-Harima Heavy Industry Co., Ltd. Technical Research Institute (72) Inventor Morioka Mikio Kanagawa Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. Technical Research Laboratory (1) Shin-Nakahara-cho, Isogo-ku (72) Inventor Kunio Ohori 1st Shin-Nakahara-cho, Isogo-ku, Yokohama, Kanagawa Prefecture Ishikawajima-Harima Heavy Industries Co., Ltd. Technical Research Center (56) References HEI 5-141594 (JP, A) JP 54-75659 (JP, A) JP 54-30561 (JP, A) Kai-56-113894 (JP, A) JP-A-56-131888 (JP, A) Actual-open Sho-58-31493 (JP, U) Actual-open Sho-50-55956 (JP, U) Actual-open Sho-54-163363 ( JP, U) Actual development 56-44290 (JP, U) Actual development 56-157498 (JP, U) Actual development 54-165359 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16L 59/14 F17D 1/02

Claims (2)

(57) [Claims] 1. A plurality of heat insulating material blocks bent into a cylindrical surface along a pipe are arranged in the inner circumferential direction of the pipe with a gap portion between them, and a gap is provided between them. A plurality of rows arranged in the longitudinal direction of the pipe having parts, each heat insulating material block is fixed to the pipe side at one point in the center, and a laminated heat insulator in which fibrous heat insulating materials are laminated is compressed in the laminating direction. In the gap portion between the heat insulating material blocks, the compression direction is filled and inserted in the width direction of the gap portion, between the end surfaces of the adjacent heat insulating material blocks, and the longitudinal direction in the inner peripheral surface of the adjacent heat insulating material blocks. Between the sides of the seal or between the sides in the circumferential direction, a band-shaped seal member that seals the gap is installed by providing a slack portion, some of the seal members are provided with ventilation holes , and a heat insulating material is provided in the pipe. Insulated on multiple layers
Consists of a heat insulating material block, between the heat insulating material blocks adjacent in the circumferential Direction, a gap portion of the two-stage consisting of narrow gap portion of the inner peripheral side of the wide gap portion and the outer peripheral side, wide gap portion and the narrow A heat insulating material plate having a smaller width dimension than the wide gap portion is arranged in the step portion with the wide gap portion, and the laminated heat insulating body is filled and inserted in the wide gap portion with the compression direction facing the width direction of the wide gap portion, A low-temperature gas pipe, wherein a laminated heat insulator is filled and inserted in a narrow gap portion with a compression direction directed in a radial direction of the pipe. 2. The low temperature gas pipe according to claim 1, wherein the laminated heat insulator is constituted by alternately laminating a fibrous heat insulating material and a convection suppressing membrane member.