JPH07198089A - Heat insulating pipe body and manufacture thereof - Google Patents

Abstract

PURPOSE:To shorten the time required for vacuum exhaust by providing a heat insulating layer with ceramic grain scattered between the wound layers of strip metallic foil in an heat insulating pipe body such as vacuum insulating double piping formed by covering the outer peripheral surface of the pipe body with the lap-wound layers of the strip metallic oil. CONSTITUTION:Strip metallic foil 4 are respectively pulled out of diameter enlarged reels 12, 13, and the end parts are fastened to the outer peripheral surface of a pipe body 2 by welding or the like. A driver is then actuated to rotate a mandrel 11 and thereby to rotate the pipe body 2. Utilizing this turning force, the strip metallic foil 4 round around the reels 12, 13 are wound at a right angle around the outer periphery of the pipe body 2. Simultaneously with this winding, ceramic grain 5 is scattered on the strip metallic foil 4 before being wound from a powder drop device 26, and the strip metallic foil 4 in the state of ceramic grain 5 being scattered on the inside is wound around the outer periphery of the pipe body 2. A heat insulating layer with desired wound layers is thereby formed at the outer periphery of the pipe body, and a rewinding preventive band 3 is wound around the outermost periphery of the metallic foil 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat insulating pipe used as an inner pipe (inner container) of a vacuum heat insulating double pipe, a vacuum heat insulating double container and the like, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Insulation pipes are used in various heat insulation pipes. For example, vacuum heat insulation double piping is used for liquid transportation pipes that transport ultra-low temperature fluids such as liquid nitrogen,
A heat insulating pipe is used as the inner pipe of the vacuum heat insulating double pipe. As shown in FIG. 8, a heat insulating pipe of this type usually has, on the outer periphery of the pipe 33, alternating multilayer winding layers (10 to 3) of strip-shaped aluminum foil 31 and dexter paper (asbestos paper) 32.
It is configured by providing 0 layers), and is generally manufactured as follows. That is, first, the aluminum foil 31 and the dexter paper 32 are combined to form a two-layered body, which is wound around the outer circumference of the tube body 33, and the outer circumferential surface of the tube body 33 is coated with multiple layers by wrapping layers. Being manufactured. The outermost layer of the heat insulating pipe body (inner pipe) thus obtained is covered with an outer pipe 34 with a space left between them, and in this state, a high vacuum is drawn between the outer pipe 34 and the inner pipe. Manufactures vacuum insulated double piping.

[0003]

However, since the dexterapaper 32 is highly water-absorbent, if the heat insulating pipe is manufactured in a high humidity atmosphere, the dexterapaper will be wound during the winding process. 32 absorbs moisture in the air and becomes a high water content state. For this reason, in the process of manufacturing a vacuum heat insulating double pipe using the heat insulating pipe body, if the inner and outer pipes are evacuated, the moisture becomes a resistance of the vacuum evacuation, which causes a problem that it takes a long time for the vacuum evacuation. .

The present invention has been made in view of the above circumstances, and an object thereof is to provide a heat insulating pipe body and a method for producing the heat insulating pipe body which can reduce the time required for vacuum evacuation.

[0005]

In order to achieve the above object, the present invention is to wrap a strip-shaped metal foil on the outer periphery of a tubular body and coat the outer peripheral surface of the tubular body with a wrapping layer of the strip-shaped metal foil. In the heat insulating pipe body, the heat insulating pipe body is provided with a heat insulating layer in which ceramic particles are scattered between the winding layers of the above-mentioned band-shaped metal foil, and the band metal foil is wound around the outer periphery of the pipe body. Then, in the manufacturing method of the heat insulating pipe body in which the outer peripheral surface of the pipe body is covered with the lap winding layer of the strip-shaped metal foil, the ceramic particles are dispersed on the portion of the strip-shaped metal foil before being wound on the outer periphery of the pipe body, and the inner side is made of ceramics. The above-mentioned strip-shaped metal foil is wound around the outer periphery of the tubular body in a state where particles are scattered, and the ceramic particles are sprinkled on the part of the strip-shaped metal foil following the wound strip-shaped metal foil, and the ceramic particles are scattered inside. By repeating the above winding, The preparation of the heat insulation pipe body provided with a heat insulating layer winding layers to the ceramic particles are scattered in the winding has been strip metallic foil as a second gist.

[0006]

In other words, the heat insulating pipe of the present invention is constituted by providing a heat insulating layer in which ceramic particles are scattered between winding layers of a strip-shaped metal foil wound around the outer periphery of the pipe, and the ceramic particles are the above-mentioned Since it has much less water absorption than the paper, it absorbs less water even when it is installed in a high-humidity atmosphere, and thus vacuum exhaust can be performed in a short time. Moreover, since the ceramic particles are scattered in the heat insulating layer provided between the winding layers of the strip-shaped metal foil, the voids between the ceramic particles serve as air passages during vacuum evacuation, so that the vacuum evacuation can be performed efficiently. Become. Further, the manufacturing method of the present invention, by scattering the ceramic particles in the portion of the strip-shaped metal foil before being wound around the outer periphery of the pipe body, the strip-shaped metal foil in the state where the ceramic particles are scattered inside the pipe body By winding around the outer periphery and repeating this, a heat insulating layer in which ceramic particles are scattered is provided between the winding layers of the strip-shaped metal foil.
As a result, the heat insulation pipe body of the present invention can be efficiently manufactured, and at the same time, continuous manufacture is possible.

Next, the present invention will be described in detail.

The heat-insulating pipe body of the present invention is obtained by using the pipe body, the strip-shaped metal foil wound around the pipe body, and the ceramic particles dispersed on the strip-shaped metal foil.

As the above-mentioned tubular body, various tubular products such as metal pipes, synthetic resin pipes, synthetic resin pipes whose surface is vapor-deposited or plated with metal are used.

The strip-shaped metal foil wound around the tubular body is not particularly limited, and various metal foils can be used. The thickness of these metal foils is 5 to 300.
μm, preferably 5 to 100 μm, more preferably 5 to
It is set to 30 μm. Among the above metal foils, in particular,
The use of a metal foil having a high melting temperature and good radiation efficiency, such as stainless steel foil, copper foil or nickel foil, gives good results.

As the ceramic particles, forsterite (2MgO.SiO ₂ ), magnesia (Mg)
O) and particles of a ceramic material such as alumina (Al ₂ O ₃ ) can be used alone or in combination.
The particle size of such ceramic particles is usually 5 to 20.
The thickness is about 0 μm, preferably 15 to 50 μm (thus, the thickness of the heat insulating layer formed between the winding layers of the band-shaped metal foils that are overwound is substantially the same as that).

In the present invention, the above-mentioned raw materials are used to manufacture, for example, a heat insulating pipe by an apparatus as shown in FIG. 1 or 6.
That is, in the method of FIG. 1, first, the mandrel 1 that is connected to a driving device such as the motor 16 and is rotatably provided.
The tubular body 2 is fitted on the outer peripheral side of the tubular body 1, and a plurality of rotatable reels 12 and 13 around which the strip-shaped metal foil 4 is wound are fixed along one side of the tubular body 2. At this time, reel 1
The direction in which the strip-shaped metal foil 4 is pulled out from the wires 2 and 13 is perpendicular to the tube body 2. The reels 12 and 13 are rotatably fitted over the outer circumferences of the reel support bases 20 and 21, and the brake support pawls (hidden and invisible) are provided on the outer peripheries of the reel support bases 20 and 21. Body is reel 1
2 and 13 are pressed against the inner peripheral surface of the cylinder to exert a braking action,
It serves as a resistance when the strip-shaped metal foil 4 is pulled out. In addition, the strip-shaped metal foil 4 wound around the reels 12 and 13 is set so that the end portions of the strip-shaped metal foil 4 slightly overlap with each other when wound around the tube body 2. And in Figure 2,
A powder dropping device 26 as shown in FIG. 3 is arranged in the upper space between the mandrel 11 and the reels 12 and 13. Ceramic particles 5 are filled in the powder dropping device 26, and the ceramic particles 5 are wound around the tube body 2 from a powder dropping port 26a formed in the lower end surface of the powder dropping device 26. It is dropped onto the immediately preceding strip-shaped metal foil 4. Also,
This powder dropping device 26 is provided with a shutter 26b as shown in FIG.
Is configured to vertically rotate the connecting plate 26c about the axis X by a driving device (not shown) to open and close the powder dropping port 26a. In addition, 14 and 15 are reel supporting bases 20,
A shaft body to which 21 is attached, 16a is a motor 1 which is connected to the right end portion 11a of the mandrel 11 via a connecting member 17.
The output shafts 6 and 18, 19 are support bases for rotatably supporting the end portions of the shaft bodies 14, 15, and 22 is a support base for rotatably supporting the end portions of the mandrel 11.

The reels 12 and 13 arranged as described above
The strip-shaped metal foils 4 are pulled out from the respective ends, and the ends thereof are fixed to the outer peripheral surface of the tubular body 2 by welding or the like. After that, the drive unit 16 is operated to rotate the mandrel 11 to rotate the tube body 2, and the rotational force is used to move the strip-shaped metal foil 4 wound around the reels 12 and 13 onto the tube body 2. Wrap it around the outer periphery at a right angle. Simultaneously with this winding, the powder dropping device 26 sprays the ceramic particles 5 on the portion of the strip-shaped metal foil 4 before the winding, and the ceramic particles 5 inside.
The strip-shaped metal foil 4 is wound around the outer periphery of the tubular body 2 in a scattered state, and further, the ceramic particles 5 are squeezed from the powder dropping device 26 to the portion of the strip-shaped metal foil 4 following the wound strip-shaped metal foil 4. The strip-shaped metal foil 4 is continuously wound with the ceramic particles 5 scattered on the inside. The winding of the strip-shaped metal foil 4 and the ceramic particles 5 around the winding portion.
By repeating the above-mentioned spraying, the heat insulating layer of a desired winding layer is formed on the outer periphery of the tubular body 2 (the band-shaped metal foil 4 wound in layers and the heat insulating layer in which the ceramic particles 5 formed between the winding layers are scattered). Form). Next, a band 3 for preventing rewinding is provided on the outermost circumference of the strip-shaped metal foil 4 wound in multiple layers.
0 is wound at predetermined intervals as shown in FIG.
0a is laid down from the standing state and the strip-shaped metal foil 4 is fixed. Then, the tube body 2 covered with the lap winding layer of the strip-shaped metal foil 4 is removed from the mandrel 11. In this way, the desired heat insulating tube is obtained. Such a heat insulating tube
For example, as shown in FIG. 5, it is used as an inner tube of vacuum heat insulation double piping. In FIG. 5, reference numeral 2 denotes a tube body in the heat insulating tube body. The tube body 2 has a plurality of strip-shaped metal foils 4 wound around its outer peripheral surface 2a, and the outer peripheral surface 2a of the tube body 2 and the strip-shaped metal foil. 4 and between the strip-shaped metal foils 4, a heat insulating layer in which ceramic particles 5 are scattered is formed. Three
Is an outer pipe, 7 is an exhaust pipe used for vacuuming, and 8 is a filter attached to the exhaust pipe 7.

On the other hand, in the method of FIG. 6, first, the motor 1
The tubular body 2 is externally fitted to a mandrel 11 that is rotatably connected to a driving device such as 6 and the left annular body (left dummy annular body) 46 is in contact with the left end edge of the tubular body 2.
Is in contact with the right edge, the right annular body (right dummy annular body)
47 is externally fitted. Further, a first screw shaft 44 having a reel support base 52 attached thereto so as to be capable of advancing and retracting by a screw mechanism is disposed along one side of the tubular body 2. More specifically, the reel support base 52 has a first guide arm portion 58 provided with a sliding hole (hidden and invisible).
And a first guide rod 54 is supported by both support bases 53 that rotatably support the end of the first screw shaft 44, and the first guide rod 54 is inserted into the sliding hole. As a result, rotation of the reel support base 52 with respect to the first screw shaft 44 is prevented, and rotation of the first screw shaft 44 causes the reel support base 52 to move along the first screw shaft 44. Has become. Then, the reel 42 around which the strip-shaped metal foil 4 is wound is rotatably and detachably fitted onto the outer periphery of the reel support base 52. Also, the reel support base 52
Similar to the device of FIG. 1, a claw body for braking (hidden and invisible) is provided on the outer periphery of the. A U-shaped support portion 55a is provided on the reel support base 52 in a protruding manner, and ridges are provided on both left and right sides of a flat plate-shaped guide portion 55b supported and fixed by the U-shaped support portion 55a. , Acts as a guide to send the strip-shaped metal foil 4 pulled out from the reel 42 obliquely toward the mandrel 11. This allows
The strip-shaped metal foil 4 is fitted to the mandrel 11 at the inclination angle of the guide part 55b, and the annular bodies 4 on the left and right sides.
It is spirally wound around the outer circumference of 6,47. A second screw shaft 45 is arranged above one side of the mandrel 11 while looking down at the spirally wound strip-shaped metal foil 4. The second screw shaft 45 is attached to the belt 63.
The rotation of the output shaft 16a of the motor 16 causes the belt 4 to rotate by the rotation of the second screw shaft 45.
The first screw shaft 44 rotates via the shaft 9. The second screw shaft 45 has a drop device support table 61.
However, by a screw mechanism, it is adapted to move along the second screw shaft 45 in synchronization with the spirally wound strip-shaped metal foil 4. The second screw shaft 45 of the drop device support base 61
Along with the first screw shaft 44 of the reel support base 52, the rotational force of the second screw shaft 45,
This is performed by the rotation preventing action of the second guide arm portion 59 and the second guide rod 60, and is performed in synchronization with the movement of the reel support base 52 by the action of the belt 49 connecting the two shafts 44, 45. As shown in FIG. 7, the powder dropping device 4 having the same structure as that shown in FIG.
3 (only the length in the left-right direction is short) is provided so that the ceramic particles 5 are dropped onto the portion of the strip-shaped metal foil 4 that is spirally wound. In FIG. 6, 50, 5
Reference numerals 1, 64 and 65 are pulleys, and 57 is a support base that rotatably supports the end portion of the second screw shaft 45.

In the method shown in FIG. 6, the strip-shaped metal foil 4 is pulled out from the reel 42 arranged as described above, and its end portion is fixed to the outer peripheral surface on one end side of the left dummy annular body 46 by welding or the like. After that, the drive device 16 is operated to rotate the mandrel 11 and the second screw shaft 45, thereby rotating the tubular body 2 and the left and right dummy annular bodies 46 and 47, and utilizing this rotational force, the reel is rotated. The strip-shaped metal foil 4 wound around 42 is spirally wound around the outer periphery of the left dummy annular body 46. Simultaneously with this winding, from the powder dropping device 43, the ceramic particles 5 are applied to the portion of the strip-shaped metal foil 4 before being wound.
And the strip-shaped metal foil 4 is spirally wound around the outer circumference of the tube body 2 with the ceramic particles 5 scattered inside. In this case, the first screw shaft 44 is connected to the second screw shaft 44 via the belt 49.
Since the reel support base 52 is gradually moved to the right side in the figure by the rotation of the screw shaft 45 of, the strip-shaped metal foil 4 is slightly displaced in the axial direction of the mandrel 11 (to the right side in the figure). It is wound with a slight shift. In this way, the strip-shaped metal foil 4 is sprayed with the ceramic particles 5 and is transferred from the outer peripheral surface of the left dummy annular body 46 to the tubular body 2.
And the outer peripheral surface of the right dummy annular body 47. By the way, when the strip-shaped metal foil 4 is suddenly wound around the tubular body 2, the strip-shaped metallic foil 4 is wound at an angle with a slight shift, so that the number of windings is increased at the left end portion (winding start portion) of the tubular body 2. Will run out. The same applies to the right end portion (winding end portion) of the tubular body 2. Therefore, in the present invention, the dummy annular bodies 46 and 47 are provided on the left and right of the tubular body 2,
The winding start portion and the winding end portion of the strip-shaped metal foil 4 are positioned on the left and right dummy annular bodies 46 and 47. As a result, the strip-shaped metal foil 4 wound around the tubular body 2 becomes
Even if any part is taken, it becomes a layer of the same number of turns.
In this manner, the strip-shaped metal foil 4 wound around the entire tubular body 2
A band 30 for preventing rewinding is wound around the outer periphery of the belt at predetermined intervals in the axial direction to fix the band-shaped metal foil 4. Then, the tube body 2 covered with the lap winding layer of the strip-shaped metal foil 4 is removed from the mandrel 11. In this way, the desired heat insulating tube is obtained.

Next, the present invention will be explained based on examples.

[0017]

Example 1 As a strip-shaped metal foil, width 30 cm, thickness 15 μm
The stainless steel foil of No. 1 was used, and this was put on the apparatus shown in FIG. 1 and wound (20 layers) around the outer circumference of the stainless steel inner tube. At this time, ceramic particles having an average particle diameter of 20 μm were scattered, and the ceramic particles were scattered between the wound layers of the stainless steel foil to obtain a desired heat insulating tube. A vacuum heat insulation double pipe as shown in FIG. 5 was constructed using this heat insulation pipe body, and the vacuum evacuation time was significantly shortened. Also,
The heat insulation performance was also good.

[0018]

Example 2 As a strip-shaped metal foil, width 30 cm, thickness 30 μm
The stainless steel foil of No. 1 was used, and this was put on the device shown in FIG. 6 and wound (20 layers) around the outer circumference of the stainless steel inner tube. The ceramic particles to be sprayed had an average particle size of 10 μm. When the vacuum heat insulating double pipe shown in FIG. 5 was constructed using the obtained heat insulating pipe, excellent effects were obtained as in the case of the above examples.

In the apparatus shown in FIGS. 1 and 6, the ceramic particles 5 in the powder dropping device 26 are connected to the powder dropping port 2
Although it is made to fall from 6a by natural fall, it is not limited to this and a blade for stirring is provided in the powder dropping device 26, and the rotation of this blade is used to move the ceramic particles 5 from the powder dropping port 26a. You may make it fall.

Further, in each of the above examples, the heat insulating layer in which the ceramic particles 5 are scattered is provided between the winding layers of the strip-shaped metal foil 4 wound around the outer periphery of the tubular body 2, but the present invention is not limited to this. A heat insulating layer in which the ceramic particles 5 are scattered may be provided between arbitrary winding layers.

[0021]

As described above, the heat insulating pipe body of the present invention is
It is configured by providing a heat insulating layer in which ceramic particles are scattered between the winding layers of a strip-shaped metal foil wound around the outer periphery of the tubular body, and the ceramic particles have very low water absorption compared to the above-mentioned dexter paper. Even if it is constructed in a high-humidity atmosphere, it absorbs little water, and thus vacuum exhaust can be performed in a short time.
Moreover, since ceramic particles are scattered in the heat insulating layer provided between the winding layers of the strip-shaped metal foil, during vacuum evacuation,
The voids between the ceramic particles serve as air flow paths, so that vacuum exhaust can be performed efficiently. Further, the manufacturing method of the present invention, by scattering the ceramic particles in the portion of the strip-shaped metal foil before being wound around the outer periphery of the pipe body, the strip-shaped metal foil in the state where the ceramic particles are scattered inside the pipe body It is wound around the outer circumference. Then, repeating that the ceramic particles are sprinkled and wound on the portion of the strip-shaped metal foil following the wound strip-shaped metal foil, and the heat-insulating layer in which the ceramic particles are scattered between the winding layers of the stacked strip-shaped metal foil. Is provided. As a result, the heat insulation pipe body of the present invention can be efficiently manufactured, and at the same time, continuous manufacture is possible.

[Brief description of drawings]

FIG. 1 is a view of the manufacturing apparatus of the heat insulating pipe as viewed from above.

FIG. 2 is an explanatory diagram of a main part of the manufacturing apparatus.

FIG. 3 is an explanatory diagram of a powder dropping device used in the manufacturing apparatus.

FIG. 4 is a cross-sectional view showing a usage state of the band.

FIG. 5 is a partial cross-sectional view of a vacuum heat insulating double pipe using the heat insulating pipe body of the example of the present invention.

FIG. 6 is a view of another example of the manufacturing apparatus for the heat insulating pipe as viewed from above.

FIG. 7 is an explanatory diagram of a main part of another example of the manufacturing apparatus.

FIG. 8 is a partial cross-sectional view of a conventional vacuum heat insulating double pipe.

[Explanation of symbols]

 2 Tubular body 4 Stainless steel foil 5 Ceramic particles

[Procedure amendment]

[Submission date] February 18, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

[Figure 1]

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 7]

[Figure 6]

[Figure 8]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location F16L 59/06 // B32B 15/01 A

Claims (2)

[Claims] 1. An adiabatic tube body, wherein a strip-shaped metal foil is wound around the outer periphery of the pipe body and the outer peripheral surface of the pipe body is covered with a lap winding layer of the strip-shaped metal foil, wherein A heat-insulating pipe body, wherein a heat-insulating layer in which ceramic particles are scattered is provided between winding layers. 2. A method for producing a heat-insulating pipe body, wherein a strip-shaped metal foil is wound around the outer periphery of the pipe body and the outer peripheral surface of the pipe body is covered with a lap winding layer of the strip-shaped metal foil, before being wound on the outer periphery of the pipe body. Ceramic particles are scattered on the strip-shaped metal foil portion, and the strip-shaped metal foil is wound around the outer periphery of the pipe body in a state where the ceramic particles are scattered inside, and the strip-shaped metal foil portion following the rolled strip-shaped metal foil. Insulating layer, in which the ceramic particles are scattered, is provided between the winding layers of the band-shaped metal foil which are overlapped by repeating the above-mentioned winding with the ceramic particles scattered inside. How to make a tube.