JP2016194358A - Heat/earthquake resistant pipeline system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipeline system which achieves improved heat resistance and earthquake resistance.SOLUTION: A heat/earthquake resistant pipeline system 100 of the invention includes: a resin pipeline 200; a resin joint connecting the resin pipeline 200; an independent bubble type heat insulation material 300; and a fiber heat insulation material 400. The independent bubble type heat insulation material 300 covers an outer peripheral surface of the resin pipeline 200 connected by the joint at a part of the resin pipeline 200 in an axial direction. The fiber heat insulation material 400 covers the outer peripheral surface at another part in the axial direction. A fiber direction of the fiber heat insulation material 400 is mainly set along the outer peripheral surface of the resin pipeline 200. Further, an end surface of the fiber heat insulation material 400 contacts with an end surface of the independent bubble type heat insulation material 300.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a piping system. More specifically, the present invention relates to a piping system having both heat resistance and earthquake resistance.

Conventionally, metal piping has been widely used as piping capable of constructing a piping system having excellent heat resistance.
On the other hand, resin piping having various functions has been developed. For example, a plastic pipe for laying a pipe for a liquid, paste, and / or gaseous medium, as a multilayer pipe having high mechanical, chemical and thermal resistance, 2001-355767 (Patent Document 1) includes a pipe body composed of at least three layers having an inner layer and an outer layer made of a base material, and an intermediate layer made of a base material and at least one additional material. In which the inner and intermediate layers of the pipe are made of a polymer material and in the amorphous region of the inner and / or intermediate layer semi-crystalline polymer material in contact with the medium to be supplied, In particular, it contains additives for media with oxidizing and reducing action, and in the amorphous region of the polymer material of the intermediate layer, inside the pipe, fittings or molded parts Pipes characterized in that it contains fillers and / or additives as barrier materials to reduce the movement of the additive to the outer layer is disclosed from.

JP 2001-355767 A

  Piping systems using metal pipes are excellent in heat resistance, but they are easily rusted and seismic (strain resistant) due to the characteristics of the materials, and the workability and construction of piping due to being heavy. There is a problem of securing strength.

  On the other hand, among resin pipes, resin pipes can solve the problems of rust resistance, earthquake resistance, pipe workability, and building strength securing. For this reason, attempts have been made to replace metal piping with resin piping.

  However, the heat resistance of the resin pipe is lost due to the characteristics of the material. Although the above-mentioned multilayer structure resin pipe is improved in a certain degree of heat resistance, it does not reach the heat resistance enough to allow substitution of metal piping.

  In view of the above problems, an object of the present invention is to provide a piping system that achieves both improved heat resistance and earthquake resistance.

  In order to achieve the above object, the present invention includes the following inventions.

(1)
The heat-resistant and earthquake-resistant piping system of the present invention includes a resin pipe, a resin joint connecting the resin pipes, a closed cell type heat insulating material, and a fiber heat insulating material. The closed cell type heat insulating material covers the outer peripheral surface of the pipe connected by the joint in a part of the axial direction of the resin pipe. The fiber heat insulating material covers the outer peripheral surface at the other part in the axial direction, and the fiber direction is mainly along the outer peripheral surface of the resin pipe. Furthermore, the end surface of the fiber heat insulating material is in contact with the end surface of the closed cell heat insulating material.

  In this case, since the pipe and the joint are made of resin, the workability is excellent and the vibration resistance of the pipe system is excellent. And since the whole piping system is coat | covered with a heat insulating material with a fiber heat insulating material and a closed cell type heat insulating material, heat resistance is improved significantly.

And by using a fiber heat insulating material, it is excellent in workability, such as being easy to construct on site. In addition, because it is easier to deform than closed-cell insulation, even if there are irregular shapes such as strain, slight steps, irregularities, etc. on the surface shape of the piping system to be covered, the irregular shapes are absorbed. In addition, heat insulation is good because it is easy to contact the surface of the piping system.
Furthermore, when the fiber heat insulating material is freely deformable (for example, in the form of a sheet), when the shape of the piping system to be covered is complicated (for example, when the piping is a curved pipe, the connection boundary between the piping and the joint) Even when there is an irregular shape such as a step or unevenness, the degree of freedom for the shape is high.

  In addition, although the fiber heat insulating material has a continuous space, the fiber heat insulating material covering a part of the resin pipe in the axial direction has a fiber direction along the outer peripheral surface. Even if it comes into contact with the outer surface, the spreading direction of moisture or water is led mainly to the outer peripheral surface direction, which is the fiber direction, and hardly spreads in the radial direction. Therefore, it is difficult for moisture or water to reach the surface of the coated resin pipe. That is, even when the temperature in the resin pipe is relatively low, condensation is unlikely to occur, and wetting of the fiber heat insulating material on the surface of the resin pipe can be suppressed. For this reason, the rapid fall of the heat insulation effect by the wetting of a fiber heat insulating material can be prevented. Therefore, it is excellent in the heat insulation maintenance effect.

  Furthermore, since such a fiber heat insulating material and the closed cell type heat insulating material are aligned in the axial direction of the resin pipe and are in contact with each other at the end surfaces, the outer peripheral surface in which moisture or water is in the fiber direction of the fiber heat insulating material Even if it flows in the direction, the flow is blocked by the closed cell type heat insulating material and prevented from spreading further than that. Therefore, the risk of being affected by moisture or water is limited in part. Also in this point, the heat insulation maintenance effect is excellent.

(2)
In the heat-resistant and earthquake-resistant piping system of the present invention, it is preferable that the fiber heat insulating material includes a thin tubular layer having a density higher than an average density inside a thick wall.

  With the thin tubular layer having a density higher than the average density, even if moisture or water comes into contact with the outer surface of the fiber heat insulating material, the moisture or water spread direction is mainly directed to the outer peripheral surface direction which is the fiber direction. Thus, it becomes more difficult to spread in the radial direction. Therefore, moisture or water is less likely to reach the surface of the resin pipe that is coated. For this reason, it is further excellent by the heat insulation maintenance effect.

(3)
The heat-resistant and earthquake-resistant piping system of the present invention preferably includes a coating layer that integrally covers the surfaces of the closed-cell heat insulating material and the fiber heat insulating material.

  The coating layer can make it difficult to contact the moisture or water fiber insulation. Even if moisture or water penetrates into the fiber insulation, the closed cell insulation and the fiber insulation are integrally covered by the coating layer, so that the contact state between both insulations is stabilized. Therefore, even if intruded moisture or water flows in the direction of the outer peripheral surface, which is the fiber direction of the fiber insulation, the flow is more effectively stopped by the closed cell insulation, and it is more effective to spread before that Is prevented. For this reason, it is further excellent by the heat insulation maintenance effect.

(4)
In the heat and earthquake resistant piping system according to (3) above, it is preferable that the maximum diameter of the fiber heat insulating material before being covered with the coating layer is larger than the maximum diameter of the closed cell heat insulating material.

  In this case, since the fiber heat insulating material has a compression margin corresponding to the difference between the maximum diameter and the maximum diameter of the closed cell type heat insulating material, it is appropriately compressed when covered with pressure by the coating layer, After coating, the outer peripheral surface of the fiber heat insulating material and the outer peripheral surface of the closed cell type heat insulating material are substantially flush with each other and have an appropriate diameter, and the inner peripheral surface of the fiber heat insulating material is pressed against the outer surface of the pipe The contact property of the fibers of the fiber heat insulating material to the outer surface of the pipe is good, and a preferable coating is realized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway external perspective view illustrating a configuration of a heat and earthquake resistant piping system according to a first embodiment. It is an external appearance perspective view explaining construction of the heat-resistant earthquake-resistant piping system in a 1st embodiment. It is an external appearance perspective view explaining construction of the heat-resistant earthquake-resistant piping system in a 1st embodiment. It is an external appearance perspective view explaining construction of the heat-resistant earthquake-resistant piping system in a 1st embodiment. It is a typical sectional view of a fireproof earthquake proof piping system in a 2nd embodiment. It is a typical sectional view of resin piping of a fireproof earthquake proof piping system in a 3rd embodiment.

[First Embodiment]
[Basic configuration]
FIG. 1 is a partially cutaway external perspective view illustrating the configuration of the heat and earthquake resistant piping system according to the first embodiment. A heat-resistant and earthquake-resistant piping system 100 shown in FIG. 1 includes a resin pipe 200, a closed cell type heat insulating material 300, a fixture 310, a fiber heat insulating material 400, a covering sheet 510, a decorative sheet 520, a restraining member 530, and a fixing base 700. .

[Resin piping]
The resin pipe 200 is a pipe used for a cold / hot water pipe, a cold water pipe, a hot water pipe, a water and sewage pipe, and the like. The resin constituting the resin pipe 200 is not particularly limited, but may be mainly composed of a polyolefin (polyethylene, polypropylene) resin. As a result, the piping itself has flexibility and good earthquake resistance can be obtained. In particular, polyethylene is preferable because it has good flexibility and particularly excellent earthquake resistance.
The resin pipe 200 may have a single layer structure or a multilayer structure. The resin constituting the resin pipe 200 (in the case of a multilayer structure, the resin constituting a part of the layers) may be a fiber reinforced resin or a foamed resin.

The resin pipe 200 is connected by a joint (not shown). The joint also has a polyolefin resin as a main component. As a result, since the connecting portion of the piping is also flexible, for example, even if a force that shifts the axial directions of the resin piping 200 connected to each other due to an earthquake or the like is applied, the joint is bent and both the resin piping 200 deviations can be followed. Therefore, earthquake resistance can be obtained as the entire heat and earthquake resistant piping system 100.
As will be described later, the outer peripheral surface of the illustrated resin pipe 200 is covered many times, but the outer peripheral surfaces of the joints connecting the resin pipes 200 are also similarly covered without being distinguished.

[Closed cell insulation and fixtures]
The closed cell type heat insulating material 300 supports the resin pipe 200 connected by a joint with a fixed base 700 such as a gantry. The closed cell type heat insulating material 300 is disposed at a position where the fixed base 700 exists, and is configured to surround the entire outer periphery of the resin pipe 200 at the position. The closed cell type heat insulating material 300 is larger in rigidity than the fiber heat insulating material 400 and also functions as a support material. The fixing device 310 is fitted on the outer peripheral surface thereof, and the fixing device 310 is directly fixed to the fixing base 700. Thus, the resin pipe 200 can be fixed. In addition, although it is preferable from points, such as dew condensation resistance, that the fixture 310 is arrange | positioned on the outer peripheral surface of the closed cell type heat insulating material 300 like this embodiment, The position of the fixture 310 is not limited to this but arbitrary May be placed in position.

  Although the fixing mode of the fixing tool 310 and the fixing base 700 is not particularly limited, in the present embodiment, the fixing tool 310 has a screw portion 311 (see FIG. 2 described later), and the screw portion 311 is attached to the fixing base 700. It is fixed by being fastened. As a result, the resin pipe 200 connected by the joint is fixed to the fixed base 700.

  As a material of the closed cell type heat insulating material 300, a closed cell material (heat insulating material) having a heat insulating function is used. Thereby, heat insulation is performed at the portion where the resin pipe 200 is supported. As the closed cell type heat insulating material 300, one having a density higher than that of the fiber heat insulating material 400 described later is used. Accordingly, the rigidity to withstand and support the resin pipe 200 is ensured together with the function of insulating the resin pipe 200. For example, a foamable material is used, and more specifically, a foamed resin may be used. As the foamed resin, a hard resin such as a hard urethane resin may be used from the viewpoint of ensuring good heat insulation performance and rigidity. As the foaming material, for example, when the resin pipe 200 is a hot water pipe, inorganic foams such as vermiculite and sodium silicate may be used as appropriate. On the other hand, the material of the fixture 310 is preferably a metal.

[Fiber insulation]
The fiber heat insulating material 400 covers the entire outer peripheral surface of the resin piping 200 over the entire portion of the jointed resin piping 200 that is not covered with the closed cell heat insulating material 300. Therefore, the resin pipe 200 is excellent in heat resistance because both the part involved in fixing to the fixed base 700 and the part not involved, that is, the entire heat-resistant and earthquake-resistant piping system 100 are protected by the heat insulating material.

  Since the fiber heat insulating material 400 is composed of fibers, it is easier to deform than the closed cell heat insulating material 300. For this reason, the surface shape (for example, the surface shape of the resin pipe 200 and / or the joint, the surface shape near the boundary between the resin pipe 200 and the joint) of the joint pipe 200 connected to the joint is distorted, a small step or unevenness, etc. Even if the irregular shape exists, the irregular shape is absorbed and easily contacted with the surface of the heat-resistant seismic piping system 100, so that the heat insulation is good.

  The fiber heat insulating material 400 is configured such that the fibers are entangled three-dimensionally so as to contain a large amount of air and have a large specific surface area, and the direction of the fibers is mainly along the outer peripheral surface of the resin pipe 200. That is, an aspect in which most of the fibers are oriented in the circumferential direction when the fiber heat insulating material 400 is cut in a plane perpendicular to the axial direction, and a cross section in the case where the fiber heat insulating material 400 is cut in a surface including the shaft Most of the fibers are along the outer peripheral surface of the resin pipe 200 by being an aspect facing the axial direction in view and a combination aspect thereof. Three-dimensional entanglement between fibers is caused by fibers whose fiber directions are deviated from the circumferential direction and the axial direction (that is, the direction along the outer peripheral surface of the resin pipe 200), and the fiber heat insulating material 400 contains a lot of air. it can. On the other hand, since the relative amount of fibers facing the radial direction is small, the direction of the fibers constituting the fiber heat insulating material 400 is mainly along the outer peripheral surface of the resin pipe 200 as a whole.

  Since the fiber heat insulating material 400 is configured in this manner, even if the fiber heat insulating material 400 has a continuous space, even if moisture or water contacts the outer surface of the fiber heat insulating material 400, the moisture or water The spreading direction is guided mainly in the direction of the outer peripheral surface, which is the fiber direction, and hardly spreads in the radial direction. Accordingly, it is difficult for moisture or water to reach the surface of the resin pipe 200 that is covered. For this reason, it is excellent in the heat insulation maintenance effect.

  The fiber heat insulating material 400 configured as described above is in contact with the closed cell heat insulating material 300 at the end surfaces. For this reason, even if moisture or water flows in the direction of the outer peripheral surface, which is the fiber direction of the fiber heat insulating material 400, the flow is blocked by the closed cell heat insulating material 300 and is prevented from spreading further than that. Therefore, the risk of being affected by moisture or water is limited in part. Also in this point, it is excellent in the heat insulation maintenance effect.

  As the fibers constituting the fiber heat insulating material 400, inorganic fibers are preferably employed from the viewpoint of fire prevention and the like. Specific examples of the inorganic fiber include glass fiber, ceramic fiber, and artificial mineral fiber.

  Although the fiber diameter of the fiber which comprises the heat insulation fiber layer 400 is not specifically limited, For example, they are 5 micrometers or more and 10 micrometers or less. It is easy to maintain a shape in which fibers are entangled three-dimensionally by being an appropriate thickness not less than the above lower limit value, and it is easy to efficiently form an air phase by being an appropriate fineness not more than the above upper limit value. Therefore, preferable heat insulation can be provided. The fiber diameter is an average of the maximum diameters of the cross sections of the fibers constituting the heat insulating fiber layer 400.

  Although the fiber length of the fiber which comprises the heat insulation fiber layer 400 is not specifically limited, For example, it exceeds 5 mm, Preferably it is 7 mm or more, More preferably, it is 9 mm or more. As a result, the shape in which the fibers are entangled is unlikely to collapse, and the heat insulating property that is preferably maintained can be provided. Although the upper limit contained in the range of the fiber length which comprises a heat insulation fiber layer is not specifically limited, For example, 20 mm, Preferably it may be 15 mm. The fiber length is an average of the lengths of the fibers constituting the heat insulating fiber layer 400.

In the present embodiment, the fiber heat insulating material 400 is made of glass wool having a density lower than that of the closed cell heat insulating material 300. Specifically, the density of the fiber heat insulating material 400 is, for example, 20 kg / m ³ or more and 100 kg / m ³ or less, preferably 45 kg / m ³ or more and 90 kg / m ³ or less. Thereby, a good heat insulating effect can be obtained. The fiber heat insulating material 400 may have a thickness that is substantially flush with the surface of the closed cell heat insulating material 300 or the surface of the fixture 310 fitted on the closed cell heat insulating material 300. Specifically, the thickness of the fiber heat insulating material 400 may be appropriately determined depending on the use and the nominal diameter of the resin pipe 200 so that a good heat insulating effect can be obtained. For example, it may be 2% to 400%, preferably 5% to 350%, more preferably 15% to 135% of the outer peripheral radius of the resin pipe 200.

[Coating sheet, decorative sheet, restraining member]
A cover sheet 510, a decorative sheet 520, and a restraining member 530 are covered in this order on the outer peripheral surfaces of the closed-cell heat insulating material 300, the fixture 310, and the fiber heat insulating material 400.
The covering sheet 510 integrally covers the surfaces of the closed cell heat insulating material 300, the fixture 310, and the fiber heat insulating material 400. As a result, the contact state between the closed cell type heat insulating material 300 and the fiber heat insulating material 400 is stabilized. Therefore, even if the infiltrated moisture or water flows in the direction of the outer peripheral surface, which is the fiber direction of the fiber heat insulating material 400, the flow is more effectively blocked by the closed cell heat insulating material 300 and spreads before that. More effectively prevented. Furthermore, since the gap is less likely to occur by stabilizing the contact state between the closed cell type heat insulating material 300 and the fiber heat insulating material 400, undesired heat transfer through the gap can also be suppressed.

  The material of the covering sheet 510 is preferably a non-permeable material. Specifically, a non-foamed resin, that is, a solid resin is preferable. By covering the surfaces of the closed cell heat insulating material 300 and the fiber heat insulating material 400 with such a water-impermeable covering sheet 510, the closed cell heat insulating material 300 and the fiber heat insulating material 400 are waterproofed, and the heat insulating property by wetting. Can be prevented. Further, since the covering sheet 510 also integrally covers the fixture 310, condensation of the fixture 310 can be prevented, and wetting of the closed cell heat insulating material 300 due to the condensation can also be prevented.

  Furthermore, the material of the covering sheet 510 is more preferably a polyolefin resin. Thereby, even if the resin piping 200 extends in the axial direction due to a temperature change and the gap between the closed cell type heat insulating material 300 and the fiber heat insulating material 400 is widened, the resin piping 200 and the covering sheet 510 are separated. Since the elongation is equal, the effect of suppressing heat transfer through the gap can be stably maintained.

The decorative sheet 520 covers the entire surface of the covering sheet 510. As a result, good appearance can be obtained. The decorative sheet 520 preferably has a metal film. The decorative sheet 520 may have a form in which a metal film is laminated on one surface of a base material. In this case, the substrate may be coated so as to be on the coating sheet 510 side, or the metal film may be coated so as to be on the coating sheet 510 side. In addition, the decorative sheet 520 may have a sandwich shape in which metal films are laminated on both sides of the base material.
More specifically, the decorative sheet 520 includes an aluminum glass cloth (ALGC) in which aluminum foil and glass cloth are bonded together, an aluminum craft (ALK) in which aluminum foil and craft paper are bonded together, and aluminum foil and split cloth. And aluminum split cloth (ALW).

  The surface of the decorative sheet 520 is covered with a restraining member 530. Thereby, the fiber heat insulating material 400 and the decorative sheet 520 laminated | stacked on the resin piping 200 can be restrained stably. The restraining member 530 can also prevent the decorative sheet 520 from peeling off. Restraint member 530 may be made of resin or metal, but is preferably made of metal from the viewpoint of fire resistance. The restraining member 530 is not particularly limited as long as the restraining member 530 has a shape capable of restraining the fiber heat insulating material 400 and the decorative sheet 520 and protecting the decorative sheet surface, but in the present embodiment, a mesh-like sheet is used.

[Construction]
2 to 5 are schematic external perspective views showing the construction process of the heat and earthquake resistant piping system 100 of the first embodiment.
As shown in FIG. 2, the resin pipe 200 is supported by the closed cell heat insulating material 300 at a position corresponding to the fixed base 700. In the present embodiment, the closed cell type heat insulating material 300 has a two-part configuration, and sandwiches the resin pipe 200 to support the resin pipe 200 and cover the entire outer peripheral surface thereof. Thereafter, the fixture 310 is fitted on the closed cell heat insulating material 300, and the screw portion 311 is fastened to the fixed foundation 700. As a result, the resin pipe 200 is fixed to the fixed base 700.

As shown in FIG. 3, a fiber heat insulating material 400 is covered on the outer peripheral surface of the resin pipe 200 fixed to the fixed base 700. The fiber heat insulating material 400 covers the entire portion where the resin pipe 200 is exposed from the closed cell heat insulating material 300. In this embodiment, as the fiber heat insulating material 400, glass wool having an undivided structure that is formed into an annular shape that is cut to a predetermined length and that has a single notch that cuts a thick wall in the axial direction is used. . The glass wool having such a non-divided structure is deformed by expanding the cut portion and is sheathed on the resin pipe 200. As a result, the entire outer peripheral surface of the resin pipe 200 is thermally insulated.
At this time, the maximum diameter of the fiber heat insulating material 400 is larger than the maximum diameter of the closed cell heat insulating material 300.

  As shown in FIG. 4, the surfaces of the closed cell heat insulating material 300 (and the fixture 310) and the fiber heat insulating material 400 that cover the resin pipe 200 are integrally covered with a covering sheet 510. The covering sheet 510 is wound around the surface to be covered, for example, while delivering the sheet from a roll wound with a long body of the covering sheet 510. In particular, in the vicinity of the boundary with the fixed base 700, the surface of the closed cell type heat insulating material 300 and the boundary between the fixed base 700 and the closed cell type heat insulating material 300 are further shielded as much as possible. In order to stabilize the contact state between the end surfaces of the fiber heat insulating material 400 and the fiber heat insulating material 400, the closed cell type heat insulating material 300 and the covering sheet 510 are wound so as to intersect with each other.

  Further, since the fiber heat insulating material 400 has a compression margin corresponding to the difference between the maximum diameter of the fiber heat insulating material 300 and the maximum diameter of the closed cell heat insulating material 300, the covering sheet 510 is wound with pressure so as to be tightened. As a result, since the fiber heat insulating material 400 is appropriately compressed, after being wound by the covering sheet 510, the outer peripheral surface thereof and the outer peripheral surface of the closed cell heat insulating material 300 are substantially flush with each other to have an appropriate diameter. Become. At the same time, since the inner peripheral surface of the fiber heat insulating material 400 is pressed against the outer surface of the resin piping 200, the fiber contact property of the fiber heat insulating material 400 to the outer surface of the resin piping 200 is improved.

  After the covering sheet 510 is wound, the decorative sheet 520 is overlapped and wound around the entire surface of the covering sheet 510, and then the restraining member 530 is wound.

[Second Embodiment]
Hereinafter, a second embodiment in which the fiber heat insulating material is different from the first embodiment will be described. In the second embodiment, matters other than the fiber heat insulating material are the same as those in the first embodiment in the structure and the construction method, and thus the description thereof is omitted.

  FIG. 5 is a schematic cross-sectional view of the flameproof and earthquake resistant piping system 100a according to the second embodiment cut along a plane perpendicular to the axial direction. In FIG. 5, the display of the decorative sheet 520 and the restraining member 530 is omitted.

[Fiber insulation 400a]
The fiber heat insulating material 400a includes a plurality of thin layers 430 and a heat insulating layer 420 filling the space therebetween. The thin layer 430 is formed substantially concentrically with the outer peripheral surface of the fiber heat insulating material 400a. The thin layer 430 is configured to have a specific surface area smaller than that of the heat insulating layer 420. Since a layer having a small specific surface area (thin layer 430) exists inside the thick wall of the heat insulating fiber layer 400a, even if moisture or water comes into contact with the outer surface of the fiber heat insulating material 400a, the spreading direction of moisture or water is In contrast to being guided in the direction of the thin layer 430, it is more difficult to spread in the radial direction. Accordingly, moisture or water is less likely to reach the surface of the resin pipe 200 that is covered. Furthermore, in this embodiment, since there are many such thin layers 430 in the radial direction, moisture or water is more difficult to spread in the radial direction.

  The thin layer 430 is realized by making the fiber density larger than that of the heat insulating layer 420, containing a binder resin, or making the fiber density larger than that of the heat insulating layer 420 and containing a binder resin.

When the fiber density of the thin layer 430 is larger than the fiber density of the heat insulation layer 420, it is preferable that it is larger than the average density of the heat insulation fiber layer 400a. In this case, for example, the average density of the heat insulating fiber layer 400a may be 1.1 to 3 times, or 22 kg / m ^{3 to} 300 kg / m ³ , preferably 26 kg ^{3 to} 300 kg / m ³ , More preferably, it may be 50 kg / m ³ or more and 300 kg / m ³ or less. More preferably, the thin layer 430 has a specific surface area small enough to prevent moisture or water from passing therethrough. As a result, moisture or water is more difficult to permeate in the radial direction. Therefore, the progress of dew condensation on the outer surface of the resin pipe 200 can be further suppressed.

  When the binder resin is contained in the thin layer 430, the binder resin is coated between the fibers by coating the surface of the fibers with the binder resin. Accordingly, the specific surface area is reduced by reducing the distance between the fibers. Alternatively, the binder resin stably maintains a relatively high fiber density in the thin layer 430 by fixing the state in which the fibers are compressed and the specific surface area is reduced. It does not specifically limit as binder resin, For example, thermosetting resins, such as a phenol resin, are mentioned.

  The thickness of the thin layer 430 may be 0.3 mm or more and 7 mm, for example. It is preferable that it is 0.3 mm or more from the viewpoint that the inside of the heat insulating fiber layer 400a can be sufficiently partitioned, and that it is 7 mm or less is preferable from the viewpoint of maintaining good heat insulating performance as the whole heat insulating fiber layer 400a. From the viewpoint of making moisture or water difficult to permeate in the radial direction, the thickness of the thin layer 430 is more preferably not less than 0.5 mm and not more than 6 mm, and further preferably not less than 1 mm and not more than 5 mm.

[Manufacture of heat insulating fiber layer]
The heat insulating fiber layers 400 and 400a can be manufactured as follows, for example. First, glass wool is hot-pressed and formed into a sheet (Step 1). Then, the glass wool sheets are concentrically stacked many times (preferably, the long glass wool sheets are wound many times) to form a thick cylindrical member (step 2). Further, the glass wool sheets that overlap each other are fixed (step 3). In fixing in step 3, it may be baked and hardened by heat, or may be bonded using a binder resin. When a binder resin is used, it is preferably water-resistant.

  The thin layer 430 may be created by increasing the heating temperature of the hot press of step 1 and / or increasing the heating time; or by increasing the amount of binder resin in step 3; Two types of glass wool sheets having different heat press conditions in step 1 (that is, one of the glass wool sheets has a higher density) may be overlaid and wound in step 2 while being overlaid. Even if the glass wool sheet and a high-density sheet made of another material (material that can be fixed such as adhesion to glass) are overlapped, the step 2 is wound in the overlapped state. Yes; these methods may be combined arbitrarily.

[Third Embodiment]
FIG. 6 is a schematic cross-sectional view of the resin piping in the heat insulating piping system of the third embodiment. As elements other than the resin piping constituting the heat insulating piping system of the third embodiment, the elements in the first embodiment, the second embodiment, and the fourth embodiment described later can be combined without any particular limitation.

[Resin piping 200b]
In the resin pipe 200b shown in FIG. 6, the first layer 210b, the second layer 220b, and the third layer 230b are laminated in this order in the direction from the axis O to the outer periphery. Between each layer, an adhesive layer or the like may be interposed, or may not be interposed. In the resin pipe 200b, one or more other layers may be further laminated.

[First layer 210b, third layer 230b]
The first layer 210b and the third layer 230b do not contain an inorganic filler unlike the second layer 220b described later. The inner layer 210b coats the inner peripheral surface of the second layer 220b so that the inorganic filler contained in the second layer 220b is not mixed into the fluid flowing inside the resin pipe 200b. Further, the third layer 230b prevents surface roughening so that the inorganic filler contained in the second layer 220b is not exposed on the outer peripheral surface of the resin pipe 200b. Thereby, the outer peripheral surface of the resin pipe 200b becomes smooth. For example, the contact between the inner surface of the heat insulating fiber layer 400 and the outer peripheral surface of the resin pipe 200b becomes good, the air contacting the outer peripheral surface of the resin pipe 200b is reduced, and the occurrence of condensation can be suppressed.

  The thickness of the first layer 210b and the third layer 230b may be 0.5 mm or more. Thereby, good surface smoothness and impact resistance performance can be obtained. The upper limit value within the thickness range of the first layer and the third layer is not particularly limited, but is 10 mm, for example, considering compatibility with creep resistance.

  Both the first layer 210b and the third layer 230b are made of a thermoplastic resin. Thereby, the mechanical characteristics are uniform on both surfaces of the second layer 220b, and the manufacturing efficiency of the resin pipe 200b is good. Both the first layer 210b and the third layer 230b may be composed of a polyolefin resin as a main component. As polyolefin resin, what was illustrated above as resin which comprises the resin piping 200 of 1st Embodiment can be used without specifically limiting. The thermoplastic resin constituting the first layer 210b and the thermoplastic resin constituting the third layer 230b may be the same or different.

[Second layer 220b]
The second layer 220b is composed of a composite compound resin in which a thermoplastic resin that is a matrix resin contains an inorganic filler. Resin piping inherently has a larger coefficient of linear expansion than metal piping, so thermal expansion and contraction due to the flow of cold / hot water in the piping is large, but the second layer 220b is a resin containing an inorganic filler. Thermal expansion and contraction of the resin pipe 200b is moderately suppressed, and appropriate dimensional stability is obtained. Therefore, good creep resistance of the resin pipe 200b can be obtained. On the other hand, the thermal expansion / contraction of the allowable amount of the resin pipe 200b is similarly expanded and followed by the covering layer 510 to maintain heat retaining properties. In this case, a gap or distortion at the joint S (see FIG. 1) of the heat insulating fiber layer 400 can be preferably prevented. For this reason, the stable heat retention effect can be obtained in a wide temperature range.

By having the second layer 220b as described above, the linear expansion coefficient x of the resin pipe 200b may be 7.0 × 10 ⁻⁵ / ° C. or less, preferably 5.0 × 10 ⁻⁵ / ° C. or less. .

(Material of second layer 220b-matrix resin)
The matrix resin in the second layer 220b is a thermoplastic resin, preferably a polyolefin resin. As the polyolefin-based resin, a resin similar to the resin constituting the first layer 210b and the third layer 230b may be used. More preferably, the matrix resin of the second layer 220b is the same as the resin constituting the first layer 210b and the third layer 230b. As a result, the adjacent layers are easily compatible with each other, and interface peeling can be effectively suppressed.

(Material of second layer 220b-inorganic filler)
Examples of the inorganic filler contained in the second layer 220b include inorganic fibers such as glass fiber, carbon fiber, ceramic fiber, and boron fiber; aluminum hydroxide, magnesium hydroxide, calcium carbonate, magnesium carbonate, calcium silicate, and magnesium silicate. Inorganic substances such as calcium oxide, magnesium oxide, alumina powder, crystalline silica, amorphous silica, aluminum nitride powder, boron nitride powder, and aluminum borate whisker. From the viewpoint of obtaining better creep resistance, the fibers are preferably inorganic fibers such as glass fibers. Said fiber can be used individually or in combination of multiple types.
Moreover, as a method for retaining the matrix resin in such a fiber, all known methods can be adopted.

  When inorganic fibers are included in the second layer 220b, the fibers may be surface-treated. For example, when the fiber is glass fiber, examples of the surface treatment agent include methacryl silane, acrylic silane, amino silane, imidazole silane, vinyl silane, and epoxy silane. Of these, aminosilane is preferred.

  As an aspect in which these fibers are arranged, an aspect in which continuous fibers are arranged in the longitudinal direction, an aspect in which continuous fibers arranged in the longitudinal direction, and continuous fibers intersecting with the continuous fibers are arranged, and a finite length is provided. The aspect by which the fiber of this is arranged is mentioned.

  When inorganic fiber is contained in the second layer 220b, the fiber length of the fiber is the fiber length of the fibers constituting the heat insulating fiber layers 400 and 400a (see FIG. 2 of the first embodiment and FIG. 3 of the second embodiment). Shorter. Thereby, the moldability is good and the orientation of the fibers can be easily controlled. Preferably, the fiber length of the fibers included in the second layer 220b is 5 mm or less. By setting the fiber length of the fiber within this range, the strength, rigidity, dimensional stability and elongation at high temperature of the molded body are effectively increased. From the viewpoint of more effectively increasing the strength, rigidity, dimensional stability and elongation at high temperature of the molded body, the fiber length of the fiber is preferably 3 mm or less, preferably 1 mm or less. Although the lower limit contained in the said fiber length range is not specifically limited, From a viewpoint of intensity | strength and rigidity, it may be 0.05 mm, for example, Preferably it may be 0.1 mm. The fiber length is an average length of fibers included in the second layer 220b.

  When inorganic fiber is contained in the second layer 220b, the fiber diameter of the fiber is the fiber diameter of the fibers constituting the heat insulating fiber layers 400 and 400a (see FIG. 2 of the first embodiment and FIG. 3 of the second embodiment). Greater than. Thereby, preferable strength and rigidity can be provided. Preferably, the fiber diameter of the fibers included in the second layer 220b may be 5 μm or more and 50 μm or less, more preferably 12 μm or more and 50 μm or less. By setting the fiber diameter within this range, the strength, rigidity, dimensional stability, and elongation at high temperature of the molded body are effectively increased. From the viewpoint of further effectively increasing the strength, rigidity, dimensional stability and elongation at high temperature of the molded body, the fiber diameter of the fiber is preferably 10 μm or more and 20 μm or less, more preferably 12 μm or more and 14 μm or less. . The fiber diameter is the average of the maximum diameters of the cross sections of the fibers included in the second layer 220b.

  The amount of the inorganic filler contained in the second layer 220b is 10% by weight or more and less than 60% by weight based on 100% by weight of the entire resin composition for producing the second layer 220b. By setting the amount of the inorganic filler to be equal to or higher than the above lower limit value, good dimensional stability of the resin pipe 200b can be obtained. By making the amount of the inorganic filler not more than the above upper limit value, good moldability can be obtained, and furthermore, the failure mode of the second layer 220b can be easily changed to ductile failure. Therefore, brittle fracture of the second layer 220b can be made difficult to occur.

(Second layer material-polyolefin sizing agent)
Further, when inorganic fibers are included in the second layer 220b, the fibers may be converged by a polyolefin sizing agent. The polyolefin sizing agent is not particularly limited as long as the fibers can be converged, but is specifically polyolefin. The polyolefin may be the same as the matrix resin. That is, if the matrix resin is polyethylene, the sizing agent may also be polyethylene. Further, the polyolefin as the sizing agent includes a modified polyolefin. Specific examples of the polyolefin sizing agent include maleic acid-modified polyolefin and silane-modified polyolefin. From the viewpoint of providing the second layer 220b with a low linear expansion coefficient, the polyolefin sizing agent is preferably a silane-modified polyolefin, and the fibers are preferably glass fibers.

From the viewpoint of favorably converging the fibers, the density of the polyolefin sizing agent is preferably 0.85 g / cm ³ or more, and preferably 1.1 g / cm ³ or less.
From the viewpoint of favorably converging the fibers, the MFR (melt mass flow rate) of the polyolefin sizing agent is preferably 0.01 g / 10 min or more, and preferably 16 g / 10 min or less. The MFR is a value measured under conditions of a temperature of 190 ° C. and a load of 2.16 kgf based on JIS K7210.

  Any method may be used for converging the fibers with the polyolefin sizing agent. The amount of the fiber with respect to 100 parts by weight of the total of the matrix resin and the polyolefin sizing agent is preferably 6 parts by weight or more, more preferably 12 parts by weight or more, still more preferably 19 parts by weight or more, preferably 533 parts by weight or less. Is 171 parts by weight or less, more preferably 138 parts by weight or less. By setting the amount of fibers in the above range, the strength, dimensional stability and elongation at high temperature of the molded body are effectively increased.

(Second layer material-compatibilizer)
Further, the second layer 220b may include a compatibilizer. Examples of the compatibilizer include modified polyolefin and chlorinated polyolefin. Examples of the modified polyolefin include maleic acid-modified polyolefin and silane-modified polyolefin. One type of compatibilizer may be used alone, or two or more types may be used in combination. From the viewpoint of providing the second layer 220b with a low linear expansion coefficient, the compatibilizing agent is preferably silane-modified polyolefin, and the inorganic filler is preferably glass fiber.

  The modified polyolefin as the compatibilizer is distinguished from the modified polyolefin as the sizing agent. The amount of the compatibilizing agent contained in the second layer 220b is 0.5 wt% or more and 20 wt% or less, preferably 1 wt% or more, based on 100 wt% of the entire resin composition for producing the second layer 220b. 10% by weight or less. By setting the content of the compatibilizer in such a range, the strength, dimensional stability, and elongation at high temperature of the molded body are effectively increased. From the viewpoint of further effectively increasing the strength, dimensional stability and high temperature elongation of the molded body, the amount of the compatibilizing agent contained in the second layer 220b is preferably 2 wt% or more and 10 wt% or less. Preferably they are 2 weight% or more and 9 weight% or less.

[Layer thickness ratio]
The ratio of each layer of the resin pipe 200b is such that when the relative thickness of the first layer 210b is 1, the thickness of the second layer 220b is 2 or more and 6 or less, preferably 3 or more and 5 or less, and the relative thickness of the third layer 230b is 0. It is preferably 5 or more and 2 or less. By setting the thickness of each layer to such a ratio, it is possible to obtain good surface smoothness and impact resistance by the first layer 210b and the third layer 230b, and good creep resistance by the second layer 220b. it can.

[Manufacturing]
The resin pipe 200b prepares a resin composition for manufacturing the first layer 210b and the third layer 230b and a resin composition for manufacturing the second layer 220b, respectively, and molds it using a molding machine. It does not specifically limit as a molding machine, A single screw extruder, a biaxial different direction parallel extruder, a biaxial different direction conical extruder, a biaxial same direction extruder, etc. are mentioned. Furthermore, when forming using a molding machine, the shaping mold, the resin temperature, and the like are not particularly limited.

  Preferred embodiments of the present invention are as described above, but the present invention is not limited to them, and various other embodiments are possible without departing from the spirit of the present invention.

[Correspondence between each part in embodiment and each component of claim]
In this specification, the heat-resistant and earthquake-resistant piping system 100 corresponds to a “heat-resistant and earthquake-resistant piping system”, the resin piping 200 and 200 b corresponds to “piping”, and the closed cell type heat insulating material 300 is “closed cell type heat insulating material”. The fiber heat insulating materials 400 and 400a correspond to the “fiber heat insulating material”, the thin layer 430 corresponds to the “tubular thin layer”, and the layer of the covering sheet 510 corresponds to the “covering layer”.

DESCRIPTION OF SYMBOLS 100 Heat-resistant earthquake-resistant piping system 200, 200b Resin piping 300 Closed cell type heat insulating material 400, 400a Fiber heat insulating material 430 Thin layer (tubular thin layer)
510 Coating sheet (coating layer)

Claims (4)

Resin piping,
A resin joint connecting the resin pipes;
In a part of the axial direction of the resin pipe, a closed cell type heat insulating material covering the outer peripheral surface of the resin pipe connected by the resin joint,
A fiber heat insulating material covering the outer peripheral surface in the other part of the axial direction, having a fiber direction mainly along the outer peripheral surface of the resin pipe, and an end surface being in contact with an end surface of the closed cell heat insulating material Fiber insulation material,
Including heat-resistant and earthquake-resistant piping system.   The heat-resistant and earthquake-resistant piping system according to claim 1, wherein the fiber heat insulating material includes a thin tubular layer having a density higher than an average density inside a thick wall.   The heat-resistant and earthquake-resistant piping system according to claim 1 or 2, further comprising a coating layer that integrally covers surfaces of the closed-cell heat insulating material and the fiber heat insulating material. The heat-resistant and earthquake-resistant piping system according to claim 3, wherein a maximum diameter of the fiber heat insulating material before being covered with the covering layer is larger than a maximum diameter of the closed-cell heat insulating material.

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