Insulated piping and vacuum insulation modules

Abstract

To provide a heat insulating pipe and a vacuum heat insulating module, capable of easily recycling a pipe.SOLUTION: A heat insulating pipe comprises a pipe 11 and a vacuum heat insulating module 15 adhered to the pipe 11. The vacuum heat insulating module 15 comprises a vacuum heat insulating material 20 covering the periphery of the pipe 11, and adhesive sheet 30 (30a, 30b) located between the pipe 11 and the vacuum heat insulating material 20 and directly adhered to the pipe 11. The adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the respective members 20, 30 constituting the vacuum insulation module 15, and the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the respective members 20, 30 constituting the vacuum insulation module 15.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present embodiment relates to a thermal insulation pipe and a vacuum insulation module. [Background technology]

[0002] Conventionally, when installing insulation around pipes used for carrying cold water, etc., glass wool, urethane foam, etc., which are easy to install on-site, have been widely used. However, glass wool and urethane foam have an issue in that condensation occurs during use due to insufficient insulation performance, which has a negative impact on the pipes and the environment. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6566321 Summary of the Invention [Problem to be solved by the invention]

[0004] Patent Document 1 discloses a technique for wrapping a vacuum insulation material around the body plate of a hot water tank. However, when the vacuum insulation material is installed along a curved surface as in Patent Document 1, a gap is generated between the body plate of the hot water tank and the vacuum insulation material, and condensation may occur in this gap.

[0005] In addition, in the past, pipes have been collected and recycled by melting them to create new materials. However, when vacuum insulation material is placed around the pipes, if adhesive or the like used to adhere the vacuum insulation material remains on the surface of the pipes, it may be time-consuming to remove the adhesive.

[0006] The present disclosure provides insulated piping and vacuum insulation modules that can facilitate recycling of the piping. [Means for solving the problem]

[0007] The insulated piping according to this embodiment comprises a piping and a vacuum insulation module adhered to the piping, the vacuum insulation module including a vacuum insulation material covering the periphery of the piping, and an adhesive sheet located between the piping and the vacuum insulation material and adhered directly to the piping, the adhesive strength between the piping and the adhesive sheet being lower than any of the adhesive strengths between each of the components constituting the vacuum insulation module, and the adhesive strength between the piping and the adhesive sheet being lower than any of the breaking strengths of each of the components constituting the vacuum insulation module.

[0008] In the thermally insulated pipe according to this embodiment, the adhesive strength between the pipe and the adhesive sheet may be 20 N / 15 mm or less.

[0009] In the thermally insulated pipe according to this embodiment, the adhesive strength between the pipe and the adhesive sheet may be 10 N / 15 mm or less.

[0010] In the insulated piping according to this embodiment, the vacuum insulation material and the adhesive sheet may be bonded together by an adhesive layer.

[0011] In the insulated piping according to this embodiment, a fixing jig may be provided on the outside of the vacuum insulation material.

[0012] In the insulated piping according to the present embodiment, a first foam layer may be located between the vacuum insulation material and the adhesive sheet.

[0013] In the insulated piping of this embodiment, the vacuum insulation module may include a second foam layer arranged around the adhesive sheet, and the vacuum insulation material may be embedded in the second foam layer.

[0014] In the thermally insulated pipe according to this embodiment, a third foam layer may be located between the second foam layer and the adhesive sheet.

[0015] The vacuum insulation module of this embodiment is a vacuum insulation module that covers the periphery of piping, and includes a vacuum insulation material and an adhesive sheet that is fixed to the vacuum insulation material and exposed to the outside, wherein the adhesive strength between the stainless steel and the adhesive sheet is lower than any of the adhesive strengths between each of the components that make up the vacuum insulation module, and the adhesive strength between the stainless steel and the adhesive sheet is lower than any of the breaking strengths of each of the components that make up the vacuum insulation module. Effect of the Invention

[0016] According to this embodiment, it is possible to facilitate recycling of the pipes. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a thermally insulated pipe according to an embodiment. [Diagram 2] 2 is a cross-sectional view (cross-sectional view taken along line II-II in FIG. 1) along the longitudinal direction of the thermally insulated pipe according to the embodiment. [Diagram 3] 3 is a cross-sectional view (cross-sectional view taken along line III-III in FIG. 1) along a radial direction of a thermally insulated pipe according to an embodiment. [Figure 4] FIG. 2 is a cross-sectional view showing a vacuum insulation material alone. [Diagram 5] FIG. 1 is a diagram showing a method for measuring adhesive strength. [Figure 6] FIG. 2 is a schematic cross-sectional view showing an adhesive sheet. [Figure 7] 1 is a cross-sectional view showing a vacuum insulation module according to one embodiment. [Figure 8] 1A to 1C are diagrams illustrating a method for manufacturing a thermally insulated pipe according to an embodiment. [Figure 9] FIG. 4 is a longitudinal sectional view showing a thermally insulated pipe according to a first modified example. [Figure 10] FIG. 11 is a longitudinal sectional view showing a thermally insulated pipe according to a second modified example. [Figure 11] FIG. 11 is a longitudinal sectional view showing a thermally insulated pipe according to a third modified example. [Figure 12] FIG. 11 is a perspective view showing a heat insulating pipe according to a fourth modified example. [Figure 13] 13 is a radial cross-sectional view (cross-sectional view taken along line XIII-XIII in FIG. 12) showing a thermally insulated pipe according to Modification 4. FIG. [Figure 14] 14 is a cross-sectional view (cross-sectional view taken along line XIV-XIV in FIG. 12) taken along the longitudinal direction of the thermally insulated pipe according to Modification 4. FIG. [Figure 15] FIG. 13 is a radial cross-sectional view showing a thermally insulated pipe according to a fifth modified example. [Figure 16] FIG. 13 is a longitudinal sectional view showing a thermally insulated pipe according to a fifth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] An embodiment will be described below with reference to the drawings. Each of the figures shown below is a schematic illustration. Therefore, the size and shape of each part are appropriately exaggerated to facilitate understanding. In addition, it is possible to carry out appropriate modifications within the scope of the technical idea. In each of the figures shown below, the same parts are given the same reference numerals, and some detailed explanations may be omitted. In addition, the numerical values ​​such as dimensions of each member and the material names described in this specification are examples of an embodiment, and are not limited to these, and can be appropriately selected and used. In this specification, terms that specify shapes and geometric conditions, such as parallel, orthogonal, and vertical, are intended to include substantially the same state in addition to their strict meanings.

[0019] (Insulated piping configuration) The configuration of the thermally insulated piping according to this embodiment will be described with reference to Figs.

[0020] As shown in Figs. 1 to 3, the insulated pipe 10 according to the present embodiment includes a pipe 11 and a vacuum insulation module 15 bonded to the pipe 11. The vacuum insulation module 15 includes a vacuum insulation material 20 that surrounds the pipe 11, and an adhesive sheet 30 that is located between the pipe 11 and the vacuum insulation material 20 and that is bonded directly to the pipe 11. In the present embodiment, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength between each member constituting the vacuum insulation module 15 (between the vacuum insulation material 20 and the adhesive sheet 30 in this case). The adhesive strength between the pipe 11 and the adhesive sheet 30 is also lower than the breaking strength of each member constituting the vacuum insulation module 15 (the breaking strength of the vacuum insulation material 20 and the breaking strength of the adhesive sheet 30 in this case).

[0021] The pipe 11 has an internal space through which liquid such as cold water flows. The pipe 11 has an overall cylindrical shape. The pipe 11 is located at the center of the radial direction DR of the thermally insulated pipe 10 and extends along a central axis CL. The pipe 11 has an outer surface 11a and an inner surface 11b, and the outer surface 11a and the inner surface 11b each have a circular cross section in the radial direction DR. In this specification, the central axis CL refers to the central axis of the cylinder that constitutes the pipe 11. The longitudinal direction DL refers to the direction along the central axis CL, and the radial direction DR refers to the direction perpendicular to the central axis CL.

[0022] As shown in FIG. 2, the outer diameter D1 of the pipe 11 is the distance between the central axis CL and the outer surface 11a. The inner diameter D2 of the pipe 11 is the distance between the central axis CL and the inner surface 11b. The thickness T1 of the pipe 11 is the distance between the inner surface 11b and the outer surface 11a along the radial direction DR. The outer diameter D1, the inner diameter D2, and the thickness T1 of the pipe 11 can be determined based on, for example, JIS G 3459. The pipe 11 may be made of stainless steel such as SUS304. However, the pipe 11 is not limited to this and may be made of a metal material such as aluminum, carbon steel, alloy steel, copper, or a resin material such as polyvinyl chloride, polyethylene, or polybutene.

[0023] As shown in Figs. 1 to 3, the vacuum insulation material 20 is wrapped around the piping 11 and suppresses temperature changes of liquids such as cold water flowing through the piping 11. The vacuum insulation material 20 is located on the outermost periphery of the insulated piping 10 and extends along the central axis CL. The vacuum insulation material 20 may be provided over the entire circumferential area of ​​the piping 11. Alternatively, the vacuum insulation material 20 may be provided over a portion of the circumferential area of ​​the piping 11. In this case, the vacuum insulation material 20 is preferably provided over 50% or more of the circumferential distance of the piping 11. Furthermore, the vacuum insulation material 20 may be provided over the entire longitudinal direction DL of the piping 11, or may be provided over a portion of the longitudinal direction DL.

[0024] The vacuum insulation material 20 has a polygonal cylindrical shape, and in this case, has a substantially regular octagonal cylindrical shape. The vacuum insulation material 20 has an outer surface 20a and an inner surface 20b, and the outer surface 20a and the inner surface 20b each have a polygonal (substantially regular octagonal) cross section in the radial direction DR. In this embodiment, the vacuum insulation material 20 does not directly contact the pipe 11 over the entire circumferential area, but this is not limited thereto, and a part of the vacuum insulation material 20 in the circumferential direction may directly contact the pipe 11.

[0025] The vacuum insulation material 20 has a plurality of grooves 21 extending parallel to the longitudinal direction of the pipe 11. That is, as shown in FIG. 4, the vacuum insulation material 20 has a plurality of grooves 21 (seven in this case) formed in advance along a direction corresponding to the longitudinal direction of the pipe 11. The grooves 21 are non-penetrating grooves that do not penetrate the vacuum insulation material 20 in the thickness direction. The vacuum insulation material 20 is wrapped around the pipe 11 in a cylindrical shape so that both circumferential ends 20c, 20d overlap each other, and is folded at the grooves 21 to form a polygonal cylindrical shape (see FIG. 8(c)). In this specification, the grooves 21 also include those that are already folded in this way. By forming a plurality of grooves 21 in the vacuum insulation material 20 in this way, the vacuum insulation material 20 made of a hard panel can be folded into a cylindrical shape and can be wrapped around the cylindrical pipe 11.

[0026] As shown in Fig. 2, the maximum outer diameter D3 of the vacuum insulation material 20 is the distance between the central axis CL and the vertex of the polygon that constitutes the outer surface 20a. The maximum inner diameter D4 of the vacuum insulation material 20 is the distance between the central axis CL and the vertex of the polygon that constitutes the inner surface 20b. The thickness T2 of the vacuum insulation material 20 is the distance between the inner surface 20b and the outer surface 20a, and is the distance measured at the center of the sides of the polygon that constitutes the inner surface 20b and the outer surface 20a. This thickness T2 may be 3 mm or more and 30 mm or less, and is preferably 5 mm or more and 15 mm or less.

[0027] As shown in FIG. 4, the vacuum insulation material 20 may have a core material 22 and an exterior material 23. The core material 22 may be, for example, a porous material such as silica powder, a foam such as urethane polymer, or a fiber such as glass wool. When silica powder is used, the grooves 21 extending parallel to the longitudinal direction of the pipe 11 described above can be formed more easily than when other materials are used. For this reason, it is preferable to use silica powder as the core material 22, but the present invention is not limited to this. The exterior material 23 is a member that covers the outer periphery of the core material 22, and may be a flexible sheet in which a heat-sealed layer and a gas barrier layer are laminated in this order from the core material 22. The gas barrier layer may be a metal foil, a vapor deposition sheet in which a vapor deposition layer is formed on one side of a resin sheet, or the like. The metal foil may be, for example, aluminum. The vapor deposition layer may be, for example, aluminum, aluminum oxide, or silicon oxide.

[0028] As shown in FIG. 1 to FIG. 3, the adhesive sheet 30 is located between the pipe 11 and the vacuum insulation material 20. The adhesive sheet 30 is wrapped around the pipe 11 and functions as an adhesive layer for fixing the vacuum insulation material 20 to the pipe 11. The adhesive sheet 30 also fills the gap between the pipe 11 and the vacuum insulation material 20. The adhesive sheet 30 extends in a cylindrical shape along the central axis CL of the insulated pipe 10. The adhesive sheet 30 is preferably provided over the entire circumferential area between the pipe 11 and the vacuum insulation material 20. That is, the adhesive sheet 30 is preferably filled in the gap between the pipe 11 and the vacuum insulation material 20 over the entire circumferential area. The adhesive sheet 30 may be provided over the entire longitudinal direction DL of the pipe 11, or may be provided over a part of the longitudinal direction DL.

[0029] The adhesive sheet 30 has an outer surface 30a and an inner surface 30b. The outer surface 30a of the adhesive sheet 30 has a shape corresponding to the inner surface 20b of the vacuum insulation material 20, and has a polygonal (approximately regular octagonal) cross section in the radial direction DR. The inner surface 30b of the adhesive sheet 30 has a shape corresponding to the outer surface 11a of the pipe 11, and has a circular cross section in the radial direction DR.

[0030] As shown in FIG. 2, the maximum thickness T4 of the adhesive sheet 30 is the distance between the inner surface 30b and the outer surface 30a, and is the distance measured at the apex of the polygon constituting the inner surface 20b of the vacuum heat insulating material 20. This maximum thickness T4 may be 1 mm or more and 10 mm or less, and preferably 3 mm or more and 5 mm or less. The minimum thickness T5 of the adhesive sheet 30 is the distance between the inner surface 30b and the outer surface 30a, and is the distance measured at the center of the side of the polygon constituting the inner surface 20b of the vacuum heat insulating material 20. This minimum thickness T5 may be 0.1 mm or more and 9.9 mm or less, and preferably 0.5 mm or more and 3 mm or less. The thickness T6 of the adhesive sheet 30 before being adhered to the pipe 11 (see FIG. 6) may be 1 mm or more and 15 mm or less, and preferably 1 mm or more and 10 mm or less. It is preferable that the thickness T6 of the adhesive sheet 30 is larger than the maximum thickness T4 of the adhesive sheet 30 (T6>T4).

[0031] Next, the adhesive sheet 30 may be made of a material exhibiting elastic characteristics. The adhesive sheet 30 may be attached between the pipe 11 and the vacuum insulation material 20 in at least a partially shrunk state.

[0032] As described above, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the respective members constituting the vacuum insulation module 15. In the present embodiment, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B2 between the vacuum insulation material 20 and the adhesive sheet 30 constituting the vacuum insulation module 15 (adhesive strength of B1 < adhesive strength of B2).

[0033] Specifically, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 may be 0.2 N / 15 mm or more, preferably 0.4 N / 15 mm or more, and more preferably 1.0 N / 15 mm or more. Thereby, the vacuum insulation module 15 can be surely adhered to the pipe 11, and it is possible to prevent the vacuum insulation module 15 from peeling off from the pipe 11 when not intended.

[0034] Also, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 may be 20 N / 15 mm or less, preferably 15 N / 15 mm or less, and more preferably 10 N / 15 mm or less. Thereby, when the vacuum insulation module 15 is peeled off from the outer surface 11a of the pipe 11 in order to recover and recycle the pipe 11, it is possible to prevent the adhesive sheet 30 from remaining on the outer surface 11a of the pipe 11.

[0035] In this specification, the adhesive strength refers to the force required to peel one member from another member, and specifically, it can be measured as follows.

[0036] As shown in FIG. 5, a strip-shaped test piece 81 with a width of 15 mm is attached to an adherend 82. At this time, the test piece 81 is pressed against the adherend 82 with a 1 kg pressure roller (not shown). The work is performed under standard conditions of a temperature of 23±1°C and a relative humidity of 50±5%. The adherend surface of the test piece 81 is prevented from being contaminated by dust or the like. Next, while one end 81a of the test piece 81 is adhered to the adherend 82, the test piece 81 is folded back 180° so that the back faces (opposite faces of the adherend surface) of the test piece 81 overlap each other (see FIG. 5). Next, the other end 81b of the test piece 81 is pulled at a pulling speed of 300 mm / min using a tensile tester. Thereafter, the average value of the adhesive force until the adherend 82 is completely peeled off from the test piece 81 is measured, and this value is taken as the adhesive strength (N / 15 mm). As the tensile tester, an Instron 5565 (manufactured by Instron Japan) can be used.

[0037] The adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 can be achieved by using a plate made of the same material as the material constituting the pipe 11 as the adherend 82. For example, if the pipe 11 is made of SUS304, a SUS304 steel plate can be used as the adherend 82. This SUS304 steel plate has a surface finish of BA (cold rolling followed by bright heat treatment), a surface roughness of Ra: 50±25 nm as specified in JIS B 0601, and is free of dirt, discoloration, and numerous scratches.

[0038] Furthermore, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the breaking strength of each member constituting the vacuum insulation module 15. In this embodiment, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than both the breaking strength of the vacuum insulation material 20 constituting the vacuum insulation module 15 and the breaking strength of the adhesive sheet 30. This prevents the vacuum insulation module 15 from being damaged when the vacuum insulation module 15 is peeled off from the pipe 11 in order to recover and recycle the pipe 11. As a result, the vacuum insulation module 15 can be peeled off smoothly from the pipe 11.

[0039] In this specification, the breaking strength refers to the force at which one component breaks before it is peeled off from the other component when an attempt is made to peel the one component from the other component, and specifically, it can be determined in a manner substantially similar to the method for measuring adhesive strength described above.

[0040] It is preferable to use an adhesive material such as a self-adhesive sheet or a weakly adhesive sheet as the material for the adhesive sheet 30. In this case, the adhesive sheet 30 has adhesiveness on both the inner surface 30b and the outer surface 30a. This allows the vacuum insulation material 20 to be easily fixed to the pipe 11, and also eliminates any gaps between them, preventing moisture in the air from directly contacting the outer surface 11a of the cooled pipe 11.

[0041] In this specification, a self-adhesive sheet refers to a polymeric sheet that can be attached to a substrate without the use of any other adhesive or bonding agent, without the application of additional pressure or heat, and without the use of mechanical means such as thumb tacks, screws, staples, nails, wire, etc., and has a vertical peel force of 8N or more against borosilicate glass.

[0042] Specifically, when the adhesive sheet 30 is composed of a self-adhesive sheet, the self-adhesive sheet may contain an acrylic adsorbent, a silicone adsorbent, or an olefin-based elastomer adsorbent. The acrylic adsorbent, silicone adsorbent, or olefin-based elastomer adsorbent has high adhesive strength, is only slightly reduced in adhesive strength even in a low-temperature environment, and deterioration is suppressed, so that it can withstand long-term use.

[0043] As shown in Fig. 7, when the adhesive sheet 30 is a self-adhesive sheet, the self-adhesive sheet may be a material having a large number of minute recesses 31 at least on the inner surface 30b. When the inner surface 30b of this adhesive sheet 30 is pressed against, for example, the pipe 11 which is the adherend, a vacuum is created inside the recesses 31, and the sheet adheres closely to the pipe 11 which is the adherend. That is, each recess 31 functions as a suction cup and adheres to the pipe 11. In this case, since the adhesive sheet 30 does not use adhesive, glue, or the like, it is possible to prevent adhesive, glue, or the like from remaining on the pipe 11 after the adhesive sheet 30 is peeled off.

[0044] The self-adhesive sheet constituting the adhesive sheet 30 may contain a polymer of a monomer mixture. The monomer mixture may contain two types of multifunctional urethane (meth)acrylates that have two or more (meth)acryloyl groups in one molecule and have different hardnesses when cured alone. By adjusting the hardness of each of the two types of multifunctional urethane (meth)acrylates contained in this monomer mixture, the adhesiveness of the self-adhesive sheet to the adherend can be appropriately adjusted. The hardness means the hardness measured with a type A durometer in accordance with JIS K6253-3.

[0045] In addition, the adhesiveness of the self-adhesive sheet to the adherend can also be adjusted by adjusting the crosslink density between the molecules of the adhesive material that constitutes the adhesive sheet 30. That is, by increasing the crosslink density of the adhesive material, the adhesiveness to the adherend decreases, and by decreasing the crosslink density of the adhesive material, the adhesiveness to the adherend increases. Therefore, by adjusting the crosslink density of the adhesive material, the adhesiveness of the self-adhesive sheet to the adherend can be appropriately adjusted.

[0046] When the adhesive sheet 30 is composed of a weakly adhesive (weakly sticky) sheet, the adhesive sheet 30 has an adhesive layer on the inner surface 30b side. The adhesive layer can be one that has an adhesive effect and is weakly adhesive. The weakly adhesive adhesive can be one that is made of a rubber-based material such as natural rubber (NR), styrene rubber (SBR), synthetic natural rubber (IR), or chloroprene rubber (CR) and a solvent, or an emulsion-type acrylic adhesive can be used. In addition, silicone-based, polyvinyl ether-based, or other adhesives can be used as the weakly adhesive adhesive. An organic solvent is generally used as the solvent.

[0047] FIG. 6 shows a vacuum insulation module 15 that covers the periphery of the pipe 11, before being attached to the pipe 11. The vacuum insulation module 15 includes a vacuum insulation material 20 and an adhesive sheet 30 that is fixed to the vacuum insulation material 20 and exposed to the outside. In this case, the adhesive strength between the stainless steel and the adhesive sheet 30 is lower than the adhesive strength between each of the members that constitute the vacuum insulation module 15. Specifically, the adhesive strength between the stainless steel and the adhesive sheet 30 is lower than the adhesive strength of the boundary surface B2 between the vacuum insulation material 20 and the adhesive sheet 30. Furthermore, the adhesive strength between the stainless steel and the adhesive sheet 30 is lower than the breaking strength of each of the members that constitute the vacuum insulation module 15. Specifically, the adhesive strength between the stainless steel and the adhesive sheet 30 is lower than the breaking strength of the vacuum insulation material 20 that constitutes the vacuum insulation module 15 and the breaking strength of the adhesive sheet 30. This makes it possible to prevent adhesive or the like from remaining on the outer surface 11a of the pipe 11 when the vacuum insulation module 15 is peeled off from the stainless steel pipe 11 in order to recover and recycle the pipe 11. In this embodiment, the vacuum insulation module 15 in this state before being adhered to the pipe 11 is also provided.

[0048] (Insulated piping manufacturing method) Next, a method for manufacturing the thermally insulated pipe 10 according to this embodiment will be described with reference to Figures 8(a) to 8(d). Figures 8(a) to 8(d) are cross-sectional views showing the method for manufacturing the thermally insulated pipe 10 according to this embodiment.

[0049] First, as shown in Fig. 8(a), a pipe 11 is prepared. This pipe 11 may be a new pipe prepared for making the thermally insulated pipe 10. Alternatively, an existing pipe 11 may be used, and a vacuum insulation module 15 may be attached on-site.

[0050] Next, as shown in Fig. 8(b), the vacuum insulation module 15 is prepared. The vacuum insulation module 15 includes a vacuum insulation material 20 and an adhesive sheet 30 exposed to the outside. In this case, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength between each of the members constituting the vacuum insulation module 15.

[0051] Next, as shown in FIG. 8(c), the vacuum insulation module 15 is arranged around the piping 11. Specifically, the vacuum insulation module 15 is wrapped around the outer surface 11a of the piping 11 in a cylindrical shape and fixed. At this time, the adhesive sheet 30 of the vacuum insulation module 15 is adhered to the outer surface 11a of the piping 11. The vacuum insulation module 15 is preferably wrapped around the entire circumference of the piping 11. As described above, the vacuum insulation material 20 has a plurality of grooves 21. Therefore, the vacuum insulation material 20 is folded at each groove 21 to form a polygonal cylindrical shape. In addition, it is preferable that both circumferential ends 20c, 20d of the vacuum insulation material 20 are overlapped with each other. Note that since the adhesive sheet 30 itself has adhesive force, the vacuum insulation module 15 can be fixed to the adhesive sheet 30 simply by wrapping the vacuum insulation module 15 around the piping 11. At this time, it is preferable to elastically deform the adhesive sheet 30 in the thickness direction (radial direction) so that the adhesive sheet 30 becomes thinner than the initial thickness T6 (see FIG. 7). This ensures strong adhesion between the adhesive sheet 30 and the pipe 11 and the vacuum insulation material 20, making it difficult for gaps to form between them.

[0052] In this manner, as shown in FIG. 8(d), a thermally insulated pipe 10 including the pipe 11 and the vacuum insulation module 15 bonded to the pipe 11 is obtained.

[0053] A liquid such as cold water is passed through the pipe 11 of the thus obtained thermally insulated pipe 10. At this time, the surface of the pipe 11 becomes lower than the surrounding temperature, and if the temperature is lower than the dew point, condensation may occur on the surface of the pipe 11.

[0054] In contrast, according to the present embodiment, a cylindrical vacuum insulation material 20 is wrapped around the piping 11. Generally, the vacuum insulation material 20 has higher insulation performance than insulation materials such as glass wool. Therefore, by disposing the vacuum insulation material 20 around the piping 11, it is possible to more effectively suppress the occurrence of condensation on the surface of the piping 11. In this case, since the vacuum insulation material 20 has high insulation performance, the vacuum insulation material 20 can be made thinner than when glass wool or the like is used. As a result, the entire insulated piping 10 can be made thin, and the structure around the insulated piping 10 can be prevented from becoming unnecessarily large. In addition, in the case of insulation materials such as glass wool and urethane foam, water vapor penetrates into the insulation material, so there is a risk of condensation occurring inside the insulation material. However, since the vacuum insulation material 20 is covered with the exterior material 23 having high gas barrier properties as described above, it is extremely unlikely that water vapor from the outside penetrates into the interior, so it is possible to suppress the occurrence of condensation inside the vacuum insulation material 20.

[0055] Further, according to this embodiment, an adhesive sheet 30 is provided between the pipe 11 and the vacuum insulation material 20. This allows the pipe 11 and the vacuum insulation material 20 to be in close contact with each other without any gaps, and prevents condensation from occurring in the space between the pipe 11 and the vacuum insulation material 20. Even if the distance between the pipe 11 and the vacuum insulation material 20 changes due to thermal expansion, the adhesive sheet 30 absorbs this change, so that it is possible to prevent a gap from occurring between the pipe 11 and the vacuum insulation material 20 and to prevent condensation from occurring in the gap. In this way, by preventing condensation from occurring on the surface of the pipe 11 or between the pipe 11 and the vacuum insulation material 20, it is possible to prevent the pipe 11 from corroding due to condensation and water droplets falling from the pipe 11 from affecting the surroundings.

[0056] According to this embodiment, the vacuum insulation material 20 is polygonal tubular. This allows the vacuum insulation material 20, which is difficult to bend to a small radius of curvature, to be wrapped around the small diameter pipe 11 without bending the vacuum insulation material 20. When the pipe 11 is cylindrical and the vacuum insulation material 20 is polygonal tubular, the interval between the pipe 11 and the vacuum insulation material 20 is not uniform in the circumferential direction. In contrast, in this embodiment, since the adhesive sheet 30 is provided between the pipe 11 and the vacuum insulation material 20, even if the interval between the pipe 11 and the vacuum insulation material 20 is not uniform, the adhesive sheet 30 can be filled in the entire area between the pipe 11 and the vacuum insulation material 20. This prevents a gap from being generated between the pipe 11 and the vacuum insulation material 20, and prevents condensation from occurring.

[0057] Incidentally, the pipe 11 of the thermally insulated pipe 10 is discarded after being used for a certain period of time. Alternatively, the pipe 11 of the thermally insulated pipe 10 may be replaced with a new one. In such cases, the pipe 11 is recycled by being collected, melted, and made into new material. When collecting the pipe 11, first, the vacuum insulation module 15 is peeled off and removed from the pipe 11, and then the pipe 11 is removed and collected. For this reason, it is desirable to prevent other materials from adhering to the pipe 11 as much as possible.

[0058] According to this embodiment, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength between each of the members constituting the vacuum insulation module 15 (between the vacuum insulation material 20 and the adhesive sheet 30). The adhesive strength between the pipe 11 and the adhesive sheet 30 is also lower than the breaking strength of each of the members constituting the vacuum insulation module 15 (in this case, the breaking strength of the vacuum insulation material 20 and the breaking strength of the adhesive sheet 30). Therefore, when the vacuum insulation module 15 is peeled off from the pipe 11, the adhesive sheet 30, which has the lowest adhesive strength, is preferentially peeled off from the pipe 11. In this case, the members constituting the vacuum insulation module 15 (between the vacuum insulation material 20 and the adhesive sheet 30) are not peeled off, and the adhesive sheet 30 remains on the vacuum insulation module 15 side. Furthermore, the members constituting the vacuum insulation module 15 (vacuum insulation material 20 and adhesive sheet 30) themselves are not broken. This allows the adhesive sheet 30 to be removed smoothly from the pipe 11 without remaining on the outer surface 11a of the pipe 11. As a result, after removing the vacuum insulation module 15, materials (adhesive, etc.) different from the material (e.g., stainless steel, etc.) constituting the pipe 11 do not adhere to the pipe 11, making it easy to recycle the pipe 11. In addition, there is no need to remove the adhesive, etc. from the pipe 11.

[0059] (Modification) Next, various modified examples of the present embodiment will be described with reference to Fig. 9 to Fig. 16. Fig. 9 to Fig. 16 are diagrams showing modified examples of heat-insulated piping. In Fig. 9 to Fig. 16, the same parts as those shown in Fig. 1 to Fig. 8 are given the same reference numerals and detailed description thereof will be omitted.

[0060] (Variation 1) In the insulated piping 10 shown in Figure 9, an adhesive layer 41 is interposed between the vacuum insulation material 20 and the adhesive sheet 30 of the vacuum insulation module 15, and the vacuum insulation material 20 and the adhesive sheet 30 are bonded together by the adhesive layer 41.

[0061] In Fig. 9, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the members constituting the vacuum insulation module 15. That is, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B3 between the adhesive sheet 30 and the adhesive layer 41, and lower than the adhesive strength of the interface B4 between the adhesive layer 41 and the vacuum insulation material 20 (adhesive strength of B1 < adhesive strength of B3, adhesive strength of B4). Further, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the members (adhesive sheet 30, adhesive layer 41, vacuum insulation material 20) constituting the vacuum insulation module 15. Note that, as the material of the adhesive layer 41, acrylic-based, epoxy-based, silicone-based adhesives, etc. can be used. The material of the adhesive layer 41 is appropriately set according to the temperature of the fluid flowing inside the pipe 11 and the environment in which the pipe 11 is installed.

[0062] According to this modification example, by adhering the vacuum insulation material 20 and the adhesive sheet 30 with the adhesive layer 41, the adhesive strength between the members constituting the vacuum insulation module 15 can be made higher. Thereby, when peeling the vacuum insulation module 15 from the pipe 11, it can be made more certain that the adhesive sheet 30 does not remain on the pipe 11 side. Further, since the adhesive strength between the adhesive sheet 30 and the pipe 11 can be increased, it is possible to prevent the vacuum insulation module 15 from peeling from the pipe 11 when not intended.

[0063] (Modification Example 2) In the heat-insulated pipe 10 shown in Fig. 10, an adhesive layer 41 is interposed between the vacuum insulation material 20 and the adhesive sheet 30 of the vacuum insulation module 15, and the vacuum insulation material 20 and the adhesive sheet 30 are adhered by the adhesive layer 41.

[0064] Furthermore, a fixing jig 42 is provided outside the vacuum heat insulating material 20, and the vacuum heat insulating module 15 is more firmly fixed to the pipe 11 by the fixing jig 42. As the fixing jig 42, for example, a metal or resin band can be used. In this case, first, the vacuum heat insulating module 15 may be temporarily fixed to the pipe 11 using the adhesive force of the adhesive sheet 30, and then the vacuum heat insulating module 15 may be fixed to the pipe 11 by the fixing jig 42.

[0065] In FIG. 10, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the members constituting the vacuum heat insulating module 15. That is, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B3 between the adhesive sheet 30 and the adhesive layer 41, and lower than the adhesive strength of the interface B4 between the adhesive layer 41 and the vacuum heat insulating material 20 (adhesive strength of B1 < adhesive strength of B3, adhesive strength of B4). Also, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the members (adhesive sheet 30, adhesive layer 41, vacuum heat insulating material 20) constituting the vacuum heat insulating module 15.

[0066] According to this modification, even when the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is insufficient, the vacuum heat insulating module 15 can be firmly fixed to the pipe 11 using the fixing jig 42. Thereby, it is possible to prevent the vacuum heat insulating module 15 from peeling off from the pipe 11 when not intended.

[0067] (Modification 3) In the heat insulating pipe 10 shown in FIG. 11, a first foam layer 43 is located between the vacuum heat insulating material 20 and the adhesive sheet 30 of the vacuum heat insulating module 15, and an adhesive layer 41 is located between the first foam layer 43 and the vacuum heat insulating material 20. In this case, the adhesive sheet 30 and the first foam layer 43 are directly adhered by the adhesive force of the adhesive sheet 30, and the first foam layer 43 and the vacuum heat insulating material 20 are adhered by the adhesive layer 41.

[0068] The first foam layer 43 is disposed around the pipe 11 and suppresses temperature changes in a liquid such as cold water flowing through the pipe 11. The first foam layer 43 may exhibit a desired heat insulation property. For example, polystyrene foam such as extrusion-foamed polystyrene and bead-foamed polystyrene, polyurethane foam such as soft urethane foam and rigid urethane foam, polyethylene foam such as high-expansion polyethylene, and foamed heat insulating materials such as phenolic foam can be mentioned.

[0069] In FIG. 11, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the members constituting the vacuum insulation module 15. That is, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B5 between the adhesive sheet 30 and the first foam layer 43, and lower than the adhesive strength of the interface B6 between the first foam layer 43 and the adhesive layer 41, and lower than the adhesive strength of the interface B7 between the adhesive layer 41 and the vacuum insulation material 20 (adhesive strength of B1 < adhesive strengths of B5, B6, B7). Further, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the members (adhesive sheet 30, first foam layer 43, adhesive layer 41, vacuum insulation material 20) constituting the vacuum insulation module 15.

[0070] According to this modified example, by interposing the first foam layer 43 between the pipe 11 and the vacuum insulation material 20, the pipe 11 and the vacuum insulation material 20 can be brought into close contact without a gap, and the occurrence of dew condensation in the space between the pipe 11 and the vacuum insulation material 20 can be suppressed.

[0071] (Modified Example 4) In the heat-insulated pipe 10 shown in FIGS. 12 to 14, the vacuum insulation module 15 includes an adhesive sheet 30 directly adhered to the pipe 11 and a second foam layer 44 disposed around the adhesive sheet 30, and the vacuum insulation material 20 is embedded in the second foam layer 44. The second foam layer 44 is disposed around the pipe 11. A plurality of vacuum insulation materials 20 are embedded in the second foam layer 44 at intervals in the longitudinal direction DL.

[0072] The second foam layer 44 is disposed around the piping 11 and suppresses temperature changes of liquids such as cold water flowing through the piping 11. As shown in FIG. 14, in the longitudinal direction DL, the second foam layer 44 has a first region 44a in which the vacuum insulation material 20 is embedded and a second region 44b in which the vacuum insulation material 20 is not embedded. The first region 44a and the second region 44b are alternately disposed along the longitudinal direction DL. The first region 44a and the second region 44b may be integrally formed from one insulating material (e.g., polyurethane foam). Alternatively, the first region 44a and the second region 44b may be manufactured separately from each other and then integrated by bonding or the like. The second region 44b is an area that can be cut when the vacuum insulation module 15 is applied to the piping 11. For this reason, it is preferable that the first region 44a and the second region 44b are distinguishable from each other from the outside so as not to cut the first region 44a by mistake.

[0073] The second foam layer 44 may be made of any material that exhibits the desired insulating properties, and examples of such materials include polystyrene foams such as extruded polystyrene and bead method polystyrene, polyurethane foams such as soft urethane foam and hard urethane foam, polyethylene foams such as highly expanded polyethylene, and foam insulation materials such as phenol foam.

[0074] 13, the pipe 11 may be covered by two second foam layers 44 having the same configuration. In this case, each of the second foam layers 44 covers half of the circumferential direction of the pipe 11. In addition, in a cross section in the radial direction DR, the second foam layer 44 and the vacuum insulation material 20 each extend in a substantially arc shape.

[0075] In FIG. 14, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the members constituting the vacuum insulation module 15. That is, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B8 between the adhesive sheet 30 and the second foam layer 44, and lower than the adhesive strength of the interface B9 between the second foam layer 44 and the vacuum insulation material 20 (adhesive strength of B1 < adhesive strength of B8, adhesive strength of B9). Further, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the members (adhesive sheet 30, second foam layer 44, vacuum insulation material 20) constituting the vacuum insulation module 15.

[0076] According to this modification, a plurality of vacuum insulation materials 20 are embedded in the second foam layer 44 at intervals in the longitudinal direction DL. Thereby, when attaching the vacuum insulation module 15 around the pipe 11, even if an error occurs between the length of the pipe 11 and the length of the vacuum insulation module 15, the second region 44b in the second foam layer 44 where the vacuum insulation material 20 does not exist can be cut to adjust the length of the second foam layer 44. For this reason, it is possible to suppress the vacuum from being destroyed by cutting the vacuum insulation material 20 and the heat insulation performance of the vacuum insulation material 20 from being greatly reduced.

[0077] (Modification 5) In the heat-insulating pipe 10 shown in FIGS. 15 and 16, the vacuum insulation module 15 includes an adhesive sheet 30 directly adhered to the pipe 11 and a second foam layer 44 disposed around the adhesive sheet 30, and the vacuum insulation material 20 is embedded in the second foam layer 44. Further, a third foam layer 45 and an adhesive layer 41 are located between the second foam layer 44 and the adhesive sheet 30. In this case, the adhesive sheet 30 and the third foam layer 45 are directly adhered by the adhesive force of the adhesive sheet 30, and the third foam layer 45 and the second foam layer 44 are adhered by the adhesive layer 41.

[0078] In FIG. 16, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the adhesive strengths between the members constituting the vacuum insulation module 15. That is, the adhesive strength of the interface B1 between the pipe 11 and the adhesive sheet 30 is lower than the adhesive strength of the interface B10 between the adhesive sheet 30 and the third foam layer 45, and lower than the adhesive strength of the interface B11 between the third foam layer 45 and the adhesive layer 41, and lower than the adhesive strength of the interface B12 between the adhesive layer 41 and the second foam layer 44, and lower than the adhesive strength of the interface B9 between the second foam layer 44 and the vacuum insulation material 20 (adhesive strength of B1 < adhesive strength of B10, B11, B12, B9). Further, the adhesive strength between the pipe 11 and the adhesive sheet 30 is lower than any of the breaking strengths of the members (adhesive sheet 30, third foam layer 45, adhesive layer 41, second foam layer 44, vacuum insulation material 20) constituting the vacuum insulation module 15.

[0079] According to this modified example, since the third foam layer 45 is interposed between the pipe 11 and the vacuum insulation material 20, the pipe 11 and the vacuum insulation material 20 can be brought into close contact without a gap, and the occurrence of dew condensation in the space between the pipe 11 and the vacuum insulation material 20 can be suppressed.

[0080] In addition, since the configuration of the heat-insulated pipe 10 shown in FIGS. 15 and 16 is substantially the same as that of the modified example shown in FIGS. 12 to 14, detailed description thereof is omitted.

[0081] [Embodiment] Next, a specific example in the present embodiment will be described.

[0082] (Example 1) A vacuum insulation module shown in Figure 6 was produced. In this vacuum insulation module, a self-adhesive sheet (SOFRYL, manufactured by JSR Corporation) was used as the adhesive sheet. A fumed silica core material was used as the core material of the vacuum insulation material, and a barrier film containing aluminum-deposited PET was used as the exterior material of the vacuum insulation material. The adhesive strength between the SUS304 steel plate and the adhesive sheet was measured using the method described above (see Figure 5), and was 0.49 N / 15 mm. Similarly, the adhesive strength between the adhesive sheet and the vacuum insulation material was measured, and was 1.38 N / 15 mm. In this case, no material breakage occurred in the adhesive sheet and the vacuum insulation material.

[0083] Example 2 A vacuum insulation module was produced in the same manner as in Example 1, except that a self-adhesive sheet (Fitcell α C-150, manufactured by Technoflow One Co., Ltd.) was used as the adhesive sheet. The adhesive strength between the SUS304 steel plate and the adhesive sheet was measured by the above-mentioned method (see FIG. 5), and was found to be 2.27 N / 15 mm. Similarly, the adhesive strength between the adhesive sheet and the vacuum insulation material was found to be 3.85 N / 15 mm. In this case, no material breakage occurred in the adhesive sheet and the vacuum insulation material.

[0084] Comparative Example 1 A vacuum insulation module shown in FIG. 11 was produced. In this vacuum insulation module, an acrylic adhesive was used as the adhesive layer, and a urethane foam was used as the first foam layer. An acrylic adhesive was used as the adhesive sheet. The vacuum insulation material used was the same as that in Example 1. When the adhesive strength between the SUS304 steel plate and the adhesive sheet was measured by the above-mentioned method (see FIG. 5), the urethane foam, which is the first foam layer, broke. The breaking strength when the material broke was 14.30 N / 15 mm. Similarly, when the adhesive strength between the adhesive sheet and the first foam layer and the adhesive strength between the first foam layer and the adhesive layer were measured, the urethane foam, which is the first foam layer, broke. The adhesive strength between the adhesive layer and the vacuum insulation material was 19.12 N / 15 mm.

[0085] Comparative Example 2 A vacuum insulation module was produced in the same manner as in Example 1, except that a pressure sensitive adhesive sheet (NSD-100, manufactured by Nippa Corporation) was used as the adhesive sheet. The adhesive strength between the SUS304 steel plate and the adhesive sheet was measured by the above-mentioned method and found to be 22.25 N / 15 mm. The adhesive strength between the adhesive sheet and the vacuum insulation material was also found to be 20.50 N / 15 mm. In this case, no material breakage occurred in the adhesive sheet and the vacuum insulation material.

[0086] The vacuum insulation modules according to Example 1-2 and Comparative Example 1-2 were each adhered to a pipe made of SUS304, and then the vacuum insulation modules were peeled off from the pipe.

[0087] The results are shown in the table below. In the table below, "peeling (no peeling)" means that after the vacuum insulation module was peeled off, there was (wasn't) peeling between the components that make up the vacuum insulation module. "Adhesive residue (no adhesive residue)" means that adhesive remained (wasn't) on the outer surface of the piping after the vacuum insulation module was peeled off. "Fracture (no fracture)" means that after the vacuum insulation module was peeled off, one of the components that make up the vacuum insulation module broke (none of them broke).

[0088] [Table 1]

[0089] As a result, in the vacuum insulation module of Example 1-2, after the vacuum insulation module was peeled off, no peeling occurred between the components constituting the vacuum insulation module, and no adhesive remained on the outer surface of the piping. In the vacuum insulation module of Comparative Example 1, the first foam layer constituting the vacuum insulation module was broken, so adhesive remained on the outer surface of the piping. In the vacuum insulation module of Comparative Example 2, after the vacuum insulation module was peeled off, peeling occurred between the vacuum insulation material and the adhesive sheet constituting the vacuum insulation module, and adhesive remained on the outer surface of the piping.

[0090] It is also possible to combine the multiple components disclosed in the above embodiment and modified examples as necessary. Alternatively, some components may be deleted from all the components shown in the above embodiment and modified examples. [Explanation of symbols]

[0091] 10 Insulated piping 11 Piping 15 Vacuum insulation module 20 Vacuum insulation material 21 Groove 22 Core material 23 Exterior materials 30 Adhesive Sheet 41 Adhesive layer 42 Fixture 43 First foam layer 44 Second foam layer 45 Third foam layer

Claims

1. Piping and a vacuum insulation module bonded to the piping; The vacuum insulation module comprises: A vacuum insulation material covering the periphery of the piping; An adhesive sheet located between the pipe and the vacuum insulation material and directly attached to the pipe, The adhesive strength between the piping and the adhesive sheet is lower than any of the adhesive strengths between the members constituting the vacuum insulation module, The adhesive strength between the piping and the adhesive sheet is lower than the breaking strength of any of the components constituting the vacuum insulation module.

2. 2. The insulated pipe according to claim 1, wherein the adhesive strength between the pipe and the adhesive sheet is 20 N / 15 mm or less.

3. 3. The insulated pipe according to claim 1, wherein the adhesive strength between the pipe and the adhesive sheet is 10 N / 15 mm or less.

4. The insulated pipe according to claim 1 , wherein the vacuum insulation material and the adhesive sheet are bonded together by an adhesive layer.

5. The insulated pipe according to claim 1 , further comprising a fixing jig provided on an outer side of the vacuum insulation material.

6. The insulated pipe according to claim 1 , wherein a first foam layer is positioned between the vacuum insulation material and the adhesive sheet.

7. 4. The insulated piping of claim 1, wherein the vacuum insulation module includes a second foam layer disposed around the adhesive sheet, and the vacuum insulation material is embedded within the second foam layer.

8. The insulated pipe of claim 7 , wherein a third foam layer is located between the second foam layer and the adhesive sheet.

9. A vacuum insulation module that covers the periphery of a pipe, Vacuum insulation material, An adhesive sheet fixed to the vacuum insulation material and exposed to the outside, The adhesive strength between the stainless steel and the adhesive sheet is lower than any of the adhesive strengths between the members constituting the vacuum insulation module, A vacuum insulation module, wherein the adhesive strength between the stainless steel and the adhesive sheet is lower than the breaking strength of any of the components constituting the vacuum insulation module.

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