JP2014005675A - Pipe with heat insulating layer and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pipe with a heat insulating layer for suppressing a heat insulating layer from being deformed against an external impact.SOLUTION: This pipe 100 with a heat insulating layer includes: an external pipe body 1 having an outer straight pipe section 11 and an outer branch section 12 branched from the outer straight pipe section 11; an internal pipe body 2 arranged in the external pipe body 1, having an inner straight pipe section 21 corresponding to the outer straight pipe section 11 and an inner branch section 22 branched from the inner straight pipe section 21, corresponding to the outer branch section 12; and a heat insulating layer 3 disposed between the external pipe body 1 and the internal pipe body 2.

Description

  The present invention relates to a tube with a heat insulating layer and a method for manufacturing the same, and more particularly to a tube with a heat insulating layer for preventing freezing of water in a water pipe and a method for manufacturing the same.

  In general, water pipes are buried in the ground, but when crossing rivers, they are laid on the ground as bridge bridge pipes. In this case, the tap water in the water pipe may be frozen in a cold region. Various techniques for preventing such freezing of tap water have been proposed.

  Patent Document 1 discloses a pipe for running water comprising a straight pipe for running water made of a polyethylene pipe and a belt-shaped heat insulating material (heat insulating layer) made of a foamed resin sheet so as to surround the pipe for running water. An anti-freezing structure (a tube with a heat insulating layer) is disclosed. This strip-shaped heat insulating material surrounds the running water pipe so that a seam is formed in the extending direction of the running water pipe. In addition, the flowing water pipe surrounded by the heat insulating material has an arc-shaped holding member disposed at a position facing the joint of the heat insulating material, and the flowing water pipe is partially held by the holding member.

JP 2004-257179 A

  However, in the structure for preventing freezing of the flowing water pipe disclosed in Patent Document 1, since the flowing water pipe is a straight tube, it is possible to easily attach a heat insulating material to the flowing water tube. When a pipe (vertical portion) is provided in a direction perpendicular to the direction in which the running water pipe extends in a part of the running pipe (straight pipe section) and the running water pipe is formed in a T shape, the shape of the running water pipe It is thought that it is necessary to shape the heat insulating material in advance so as to correspond to (T shape).

  For example, a method of preliminarily molding a heat insulating material that is divided in half (divided into two) so as to correspond to the T-shape of the flowing water pipe and mounting the formed heat insulating material on the flowing water pipe is conceivable. However, this method may be disadvantageous in that it requires a mold for molding a heat insulating material that is divided in half (two parts).

  As another method, for example, based on the outer peripheral surface shape (T-shape) of the running water pipe, a method of cutting out the foamed resin sheet (heat insulating material) and surrounding the running water pipe can be considered. In this method, the sheet-like straight pipe portion is cut out from the foamed resin sheet based on the outer peripheral surface shape of the straight pipe portion of the flowing water pipe, and the sheet shape is formed from the foamed resin sheet based on the outer peripheral surface shape of the vertical portion of the flowing water pipe. Cut out the vertical part. Then, the sheet-like straight pipe portion is curved around the straight pipe portion of the flowing water pipe, and the butted portion is fused to form a tubular horizontal portion. Further, the sheet-like vertical portion is curved around the vertical portion of the flowing water pipe, and the butted portion is fused to form a tubular vertical portion. Then, the butted portions of the tubular horizontal portion and the tubular vertical portion are welded. Thereby, a heat insulating material is formed so as to correspond to the T-shape of the running water pipe. However, in this method, since the thickness of the foamed resin sheet is thin, it is difficult to fuse the foamed resin sheets with each other, and when performing welding, the welding rod is shaped like a saddle to form a three-dimensional complicated trajectory. It is difficult to automate because it is necessary to move with In addition, when manual welding is performed, there is a problem that the variation in quality increases.

  Moreover, in the anti-freezing structure of the flowing water pipe disclosed in Patent Document 1, the outer peripheral surface of the heat insulating material surrounding the flowing water pipe is partially exposed, so that the external shock or the like There is a problem that the heat insulating material is easily deformed. From these viewpoints, there is a demand for a tube with a heat insulating layer that suppresses deformation of the heat insulating layer with respect to external impacts and that has little variation in quality, and a method for manufacturing the same.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a tube with a heat insulating layer capable of suppressing the heat insulating layer from being deformed by an external impact. And a method of manufacturing the same.

  As means for solving the above-mentioned problems, the tube with a heat insulating layer according to the present invention is configured as follows.

  That is, the heat insulating layer-equipped tube according to the present invention is disposed in the outer tube main body including an outer straight tube portion and an outer branch portion branched from the outer straight tube portion, and the outer straight tube portion. An inner pipe body including an inner straight pipe part corresponding to the inner straight pipe part and an inner branch part branched from the inner straight pipe part and disposed in the outer branch part, and between the outer pipe main body and the inner pipe main body And a heat insulating layer provided.

  According to the tube with a heat insulating layer having such a configuration, it is possible to suppress freezing of the water flowing in the inner tube main body by the heat insulating layer, and the outer peripheral surface of the heat insulating layer is exposed by the outer tube main body. Since it can suppress, it can suppress that a heat retention layer deform | transforms with respect to an external impact with an outer tube | pipe main body.

  As specific configurations of the present invention, the following plural ones are listed.

  In the tube with a heat insulating layer according to the present invention, preferably, a first engagement portion is provided on the outer peripheral surface of the inner straight tube portion of the inner tube main body, in the vicinity of the end of the inner branch portion of the inner tube main body. Is provided with a second engagement portion that engages with the first engagement portion of the inner straight pipe portion, and the inner pipe main body includes a first engagement portion of the inner straight pipe portion and a second engagement portion of the inner branch portion. It is comprised by engaging with two engaging parts. If comprised in this way, in an outer pipe | tube main body, an inner pipe | tube main body will be easily comprised by engaging the 1st engaging part of the said inner straight pipe part, and the 2nd engaging part of the said inner side branch part. can do.

  In this case, preferably, the first engagement portion of the inner straight pipe portion of the inner pipe main body includes a first screw portion, and the second engagement portion of the inner branch portion of the inner pipe main body is the inner straight pipe. A second threaded portion that engages with the first threaded portion, and the inner tube body is configured by screwing the second threaded portion of the inner branch portion into the first threaded portion of the inner straight tube portion. It is characterized by that. If comprised in this way, in an outer pipe | tube main body, an inner pipe | tube main body can be easily comprised by engaging the 1st screw part of the said inner straight pipe part, and the 2nd screw part of the said inner side branch part. Can do.

  In the tube with a heat insulating layer according to the present invention, preferably, the heat insulating layer provided between the outer tube main body and the inner tube main body is made of a foam, and both end portions of the inner straight pipe portion are The heat insulation layer provided so as to protrude from both ends of the outer straight pipe portion and the foam is formed between the outer pipe main body and the inner pipe main body from the vicinity of both ends of the outer straight pipe portion. It is provided to the vicinity of the upper end portion of the branch portion. If comprised in this way, the heat insulation layer which consists of a foam will be provided in the whole part with which the outer side straight pipe part and the inner side straight pipe part have overlapped, and the whole part with which the outer side branch part and the inner side branch part have overlapped. Therefore, it can suppress effectively that the water which flows into an inner pipe main body freezes. Moreover, it can suppress effectively that the heat insulation layer which consists of a foam deform | transforms with respect to an external impact by an outer side straight pipe part and an outer side branch part.

  Moreover, in the tube with a heat insulating layer according to the present invention, preferably, the outer tube main body is more than the outer straight tube portion via an annular connection member disposed at each of both ends of the outer straight tube portion. The heat insulating layer further includes an outer short tube portion having a small diameter, and the heat insulating layer further includes a short tube portion side heat insulating layer made of a foam provided between the outer short tube portion and the inner straight tube portion. And If comprised in this way, it can suppress that the short tube part side heat retention layer which consists of a foam by an outer short tube part deform | transforms with respect to an external impact.

  Moreover, the manufacturing method of the pipe | tube with a heat retention layer by this invention is comprised as follows.

  That is, the method for manufacturing a tube with a heat retaining layer according to the present invention includes a step of forming an outer tube main body including an outer straight tube portion and an outer branch portion branched from the outer straight tube portion, and is inserted into the outer tube main body. Forming an inner pipe body including an inner straight pipe part corresponding to the outer straight pipe part and an inner branch part branching from the inner straight pipe part and corresponding to the outer branch part; and the outer pipe main body And a step of forming a heat insulating layer by injecting a heat insulating material between the inner tube main body and the inner tube main body.

  According to the method for manufacturing a tube with a heat insulating layer having such a configuration, it is possible to suppress freezing of water flowing in the inner tube main body by the heat insulating layer, and the outer peripheral surface of the heat insulating layer is exposed by the outer tube main body. Therefore, it is possible to suppress the heat insulating layer from being deformed by an external impact by the outer tube main body. In addition, unlike the method of cutting out the heat insulating material (heat insulating layer) so as to correspond to the T-shape of the pipe for flowing water and the case of manually welding the foamed resin sheets (heat insulating layer), it suppresses the variation in quality. can do.

  In the method for manufacturing a tube with a heat insulating layer according to the present invention, preferably, in the step of forming the inner tube main body, a first engagement portion is formed on an outer peripheral surface of the inner straight tube portion to form the outer tube main body. Inserting into the outer straight pipe part, forming a second engaging part in the vicinity of the end of the inner branch part and inserting it into the outer branch part of the outer pipe main body, and then first engaging the inner straight pipe part A step of forming the inner pipe main body by engaging the first engagement portion with the second engagement portion of the inner branch portion. If comprised in this way, an inner pipe main body can be easily assembled by engaging the 1st engaging part of an inner straight pipe part, and the 2nd engaging part of an inner side branch part in an outer pipe main body. it can.

  In this case, preferably, the first engagement portion of the inner straight pipe portion of the inner pipe main body includes a first screw portion, and the second engagement portion of the inner branch portion of the inner pipe main body is the inner straight pipe. A step of forming the inner pipe main body includes a second screw part engaged with the first screw part of the part, and the second screw part of the inner branch part is screwed into the first screw part of the inner straight pipe part. The process of forming the said inner pipe | tube main body is characterized by the above-mentioned. If comprised in this way, an inner pipe main body can be easily assembled by screwing the 2nd screw part of an inner side branch part in the 1st thread part of an inner straight pipe part in an outer pipe main body.

  Further, in the method for manufacturing a tube with a heat insulating layer according to the present invention, preferably, the step of forming the heat insulating layer is formed on the cover member after attaching the cover member so as to close both ends of the outer straight tube portion. A step of forming a heat insulating layer made of a foam between the outer tube main body and the inner tube main body by injecting a heat insulating material made of a foam from the injection hole formed. If comprised in this way, since it can suppress that the heat insulating material inject | poured in the outer pipe | tube main body protrudes outside by the cover member attached to the both ends of an outer side straight pipe part, an outer pipe | tube is easily A heat insulating layer made of a foam can be formed in the main body.

  In the method for manufacturing a tube with a heat insulating layer according to the present invention, preferably, the step of forming the heat insulating layer is a heat insulating material formed of a foam on the outer peripheral surface of the inner branch portion during the step of forming the inner tube main body. After the step of forming a branch portion side heat insulating layer made of foam between the outer branch portion and the inner branch portion by attaching a sheet, and the step of forming the inner tube body, the outer tube body and the Forming a straight tube portion side heat insulating layer made of foam between the outer straight tube portion and the inner straight tube portion by injecting a heat insulating material made of foam between the inner tube main body and the inner tube main body. It is characterized by that. If comprised in this way, it will suppress that the water which flows through the inner pipe main body freezes with the heat insulating layer (a straight pipe part side heat insulating layer and a branch part side heat insulating layer (heat insulating sheet)) which consists of two types of foams. be able to.

  In the method for manufacturing a tube with a heat insulating layer according to the present invention, preferably, the step of forming the heat insulating layer includes an annular ring at each of both ends of the outer straight tube portion after the step of forming the inner tube main body. Injecting a heat insulating material made of a foam between the outer tube main body and the inner tube main body by fusing an outer short pipe portion having a diameter smaller than that of the outer straight pipe portion through a connecting member having a shape. The method further includes the step of forming a short tube portion side heat insulating layer made of a foam between the outer short tube portion and the inner straight tube portion. If comprised in this way, while being able to form the short tube part side heat insulation layer which consists of a foam easily between an outer short tube part and an inner straight pipe part, the short tube part side heat retention is carried out by the outer short tube part. It can suppress that a layer deform | transforms with respect to an external impact.

  According to the present invention, it is possible to suppress the heat insulating layer from being deformed by an external impact.

It is a whole perspective view which shows the pipe | tube with a heat insulation layer by 1st Embodiment of this invention. It is sectional drawing of the pipe | tube with a heat retention layer shown in FIG. It is sectional drawing which shows the inner side branch part of an inner pipe main body. It is a figure for demonstrating the manufacturing method of the outer side straight pipe part of an outer pipe | tube main body. It is a figure for demonstrating the connection method of an outer side straight pipe part and an outer side branch part. It is a figure for demonstrating the manufacturing method of the inner side straight pipe part of an inner pipe main body. It is a figure for demonstrating the method of inserting an inner side straight pipe part in an outer side straight pipe part. It is a figure for demonstrating the method of inserting an inner side branch part in an outer side branch part. It is a figure for demonstrating the method of inject | pouring a heat insulating material between an outer tube | pipe main body and an inner tube | pipe main body. It is a figure which shows the cover member used when inject | pouring a heat insulating material between an outer tube | pipe main body and an inner tube | pipe main body. It is a figure for demonstrating the method of inserting an inner side straight pipe part in the outer side straight pipe part by 2nd Embodiment of this invention. It is sectional drawing for demonstrating the method of welding and connecting the lower end part of the outer side straight pipe part of an outer pipe | tube main body. It is a figure which shows the example which provides a heat insulating sheet in the outer periphery of an inner side straight pipe part while providing a heat insulating sheet in the outer periphery of the inner side branch part by 3rd Embodiment of this invention. It is a figure which shows the example which forms a level | step-difference part in the both ends of the outer side straight pipe | tube part of the outer pipe | tube main body by 4th Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
With reference to FIGS. 1-3, the structure of the pipe | tube 100 with a heat retention layer by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the heat insulating layer-equipped tube 100 according to the first embodiment includes an outer tube main body 1 having a substantially T-shape. The outer tube body 1 is made of a polyethylene tube or the like. An inner tube body 2 having a smaller diameter than the outer tube body 1 is inserted into the outer tube body 1. The inner tube main body 2 has a substantially T shape corresponding to the shape of the outer tube main body 1. A heat insulating layer 3 is filled between the outer tube main body 1 and the inner tube main body 2. The heat retaining layer 3 is made of foam or the like, and more specifically, is made of foamed polyurethane, foamed polyethylene, foamed polystyrene, or the like. The heat insulating layer 3 prevents water flowing in the inner pipe main body 2 from freezing.

  Further, a flange portion 4 in which four screw attachment holes 4 a are formed is attached above the outer tube main body 1. In addition, an air valve (not shown) is attached to the flange portion 4.

  As shown in FIG. 2, the outer tube main body 1 includes an outer straight tube portion 11 that extends in the X direction and an outer branch portion 12 that extends from the vicinity of the center of the outer straight tube portion 11 in a substantially vertical direction (Y direction). ing. An opening 11a is formed in the vicinity of the central portion of the outer straight pipe portion 11, and this opening 11a is substantially perpendicular to the direction (X direction) in which the outer straight pipe portion 11 extends (Y direction). ) So as to protrude toward the center).

  The outer straight pipe portion 11 and the outer branch portion 12 are connected at the boundary portion 10. Specifically, the opening 11a of the outer straight pipe portion 11 and the lower end portion 12a of the outer branch portion 12 are connected by fusion bonding. A bead portion 11 b is formed near the opening 11 a of the outer straight pipe portion 11. A bead portion 12 b is formed in the vicinity of the lower end portion 12 a of the outer branch portion 12.

  The inner tube main body 2 inserted into the outer tube main body 1 is disposed in the inner straight tube portion 21 disposed in the outer straight tube portion 11 of the outer tube main body 1 and the outer branch portion 12 of the outer tube main body 1. And an inner branch portion 22. The length of the inner straight pipe portion 21 in the X direction is longer than the length of the outer straight pipe portion 11 in the X direction, and both end portions 21 a of the inner straight pipe portion 21 are both end portions of the outer straight pipe portion 11. Projects a predetermined length from 11c.

  The heat insulating layer 3 provided between the outer tube main body 1 and the inner tube main body 2 is filled from a position corresponding to both end portions 11c of the outer straight pipe portion 11 to a position corresponding to the upper end portion 12c of the outer branch portion 12 ( Injection). Further, the heat insulating layer 3 provided between the outer branch portion 12 and the inner branch portion 22 is filled up to a position where it contacts the lower surface 4 b of the flange portion 4. Further, the upper thickness D1 and the lower thickness D2 of the heat retaining layer 3 provided between the outer straight pipe portion 11 and the inner straight pipe portion 21 are substantially equal.

  An opening 21 b is formed in the vicinity of the central portion of the inner straight pipe portion 21 of the inner pipe main body 2. A branch joint 23 is attached to the inner straight pipe portion 21 so as to surround the opening 21b. This branch joint 23 is attached to the outer peripheral surface of the inner straight pipe portion 21 so as to surround the opening portion 21b by EF (electrofusion) bonding described later. Further, a screw portion 23 a for attaching the inner branch portion 22 of the inner pipe main body 2 is formed on the inner surface of the branch joint 23. The screw portion 23a is an example of the “first engagement portion” and the “first screw portion” in the present invention.

  As shown in FIG. 3, the inner branch portion 22 includes a bushing 24 attached to the branch joint 23 of the inner straight pipe portion 21. In the vicinity of the lower end portion of the outer surface of the bushing 24, a groove portion 24a is formed. An O-ring 25 is attached to the groove 24a. The O-ring 25 is an example of the “seal member” in the present invention. A screw part 24b such as a parallel screw is formed above the groove part 24a. The screw portion 24b is an example of the “second engaging portion” and the “second screw portion” in the present invention. Further, a screw portion 24 c is formed in the vicinity of the upper end portion of the bushing 24.

  A socket 26 is attached above the bushing 24. A screw portion 26 a is formed in the vicinity of the lower end portion of the inner surface of the socket 26, and the socket 26 and the bushing 24 are fixed by screwing the screw portion 26 a into the screw portion 24 c of the bushing 24. Further, a screw portion 26 b is formed in the vicinity of the upper end portion of the inner surface of the socket 26.

  A nipple 27 is attached above the socket 26. A screw portion 27 a is formed near the lower end portion of the outer surface of the nipple 27, and the screw portion 27 a is screwed into the screw portion 26 b of the socket 26, whereby the nipple 27 and the socket 26 are fixed. Further, the inner peripheral surface 4 c of the flange portion 4 is attached to the outer peripheral surface of the upper end portion 27 b of the nipple 27. Further, as shown in FIG. 2, the upper end portion 12 c of the outer branch portion 12 is formed lower than the upper end portion of the nipple 27, and the lower surface 4 b of the flange portion 4 is in contact with the upper end portion 12 c of the outer branch portion 12. doing.

  Further, the inner straight pipe portion 21 and the inner branch portion 22 are fixed by screwing the screw portion 24b of the bushing 24 of the inner branch portion 22 into the screw portion 23a of the branch joint 23 attached to the inner straight pipe portion 21. The step portion 24 d of the bushing 24 is disposed in contact with the upper end portion 23 b of the branch joint 23. Further, the space between the bushing 24 (inner branch portion 22) and the branch joint 23 (inner straight pipe portion 21) is sealed (sealed) by an O-ring 25 attached to the groove portion 24a of the bushing 24.

  Next, with reference to FIG. 2 and FIGS. 4-13, the manufacturing method of the pipe | tube 100 with a heat retention layer by 1st Embodiment of this invention is demonstrated.

  First, in the step of forming the outer straight pipe portion 11 of the outer pipe main body 1, as shown in FIG. 4, an opening 11a is formed in a part (near the center) of the outer straight pipe portion 11 formed by extrusion molding or the like. Form. At this time, the bowl-shaped mold 5 is disposed below the opening 11a. Next, the vicinity of the opening 11a is heated below the melting point of the tube material. Thereafter, by pulling the mold 5 upward, the opening 11a is formed so as to protrude upward. Thereby, the outer straight pipe part 11 (refer FIG. 2) of the outer pipe | tube main body 1 is formed.

  Next, in the step of forming the outer tube main body 1, the outer straight tube portion 11 and the outer branch portion 12 are connected by butt fusion. In this step, a heater plate (not shown) is disposed between the opening 11a of the outer straight pipe portion 11 and the lower end portion 12a of the outer branch portion 12, and the opening 11a and the lower end portion 12a are mutually connected. After the end faces are heated and melted, the end faces are fused together by pressure bonding. As a result, as shown in FIG. 5, the opening 11 a of the outer straight pipe portion 11 and the lower end portion 12 a of the outer branch portion 12 are fused (connected) at the boundary portion 10. At this time, a bead portion 11 b is formed in the vicinity of the opening portion 11 a of the outer straight pipe portion 11, and a bead portion 12 b is formed in the vicinity of the lower end portion 12 a of the outer branch portion 12. In addition, you may remove the bead part formed in the inner surface of the outer side straight pipe part 11 and the outer side branch part 12 with a horuseau etc. as needed. Thereby, the outer tube main body 1 is formed.

  Next, as shown in FIG. 6, as a method of manufacturing the inner straight pipe portion 21, in the step of forming the inner straight pipe portion 21 of the inner pipe main body 2, EF (electrofusion) bonding is performed in the vicinity of the center portion of the pipe 210. Thus, the branch joint 230 is fused. In other words, a heating wire embedded in the branch joint 230 is heated by energizing from a controller (not shown), the inner surface of the branch joint 230 and the outer surface of the pipe 210 are heated and melted, and the pipe 210 and the branch joint are fused. 230 is integrated. Thereafter, the two terminals 230a of the branch joint 230 are cut. Next, an opening 21b is formed in a portion surrounded by the branch joint 230 on the outer peripheral surface of the pipe 210 so that the pipe 210 and the branch joint 230 are connected. Thereby, the inner straight pipe part 21 is formed.

  Next, as shown in FIG. 7, in the step of forming the inner pipe main body 2, the inner straight pipe part 21 is inserted into the outer straight pipe part 11 of the outer pipe main body 1. At this time, the branch joint 23 of the inner straight pipe portion 21 is disposed at a position where it overlaps with the outer branch portion 12 of the outer pipe main body 1.

  Next, as shown in FIG. 8, the above-described inner branch portion 22 is inserted into the outer branch portion 12 of the outer tube main body 1. Then, the screw part 24 b of the bushing 24 of the inner branch part 22 is screwed into the screw part 23 a of the branch joint 23 attached to the inner straight pipe part 21. Thereby, the inner side straight pipe part 21 and the inner side branch part 22 are fixed. Then, the step portion 24 d of the bushing 24 comes into contact with the upper end portion 23 b of the branch joint 23. Further, the space between the bushing 24 (inner branch portion 22) and the branch joint 23 (inner straight pipe portion 21) is sealed (sealed) by an O-ring 25 attached to the groove portion 24a of the bushing 24. Further, a predetermined gap is formed between the outer straight pipe portion 11 and the inner straight pipe portion 21. A predetermined gap is formed between the outer branch portion 12 and the inner branch portion 22.

  Next, as shown in FIG. 9, in the step of forming the heat insulating layer 3, the heat insulating layer 3 is formed by injecting (filling) the heat insulating material between the outer tube main body 1 and the inner tube main body 2. . Specifically, as shown in FIGS. 9 and 10, two metal lid members 6 having an annular shape are attached to both end portions 11 c of the outer straight pipe portion 11. The lid member 6 includes an annular portion 61 and an upright portion 62 that extends in a direction substantially perpendicular to the annular portion 61. The annular part 61 is formed with an attachment hole 6a attached to the inner straight pipe part 21 and an injection hole 6b for injecting a heat insulating material. The attachment hole 6 a of the lid member 6 is inserted into the inner straight pipe portion 21 and brought into contact with both end portions 11 c of the outer straight pipe portion 11. Thereafter, one of the injection holes 6b formed in the two lid members 6 is closed, and a heat insulating material made of a foamed material such as polyurethane foam, polyethylene foam or polystyrene is injected from the other injection hole 6b. And the lid | cover member 6 is removed after completion | finish of injection | pouring of a heat insulating material. Thereby, the tube 100 with a heat insulating layer shown in FIG. 2 is formed.

  As described above, according to the heat retaining layer-equipped tube 100 according to the first embodiment, the effects listed below can be obtained.

  In 1st Embodiment, as above-mentioned, the pipe | tube 100 with a heat retention layer is the outer pipe | tube main body 1 containing the outer side straight pipe part 11 and the outer side branch part 12 branched from the outer side straight pipe | tube part 11, and the outer pipe | tube main body 1 An inner pipe main body 2 including an inner straight pipe part 21 corresponding to the outer straight pipe part 11 and an inner branch part 22 branched from the inner straight pipe part 21 and corresponding to the inside of the outer branch part 12, A heat insulating layer 3 including foamed polyurethane or the like provided between the outer tube main body 1 and the inner tube main body 2 is provided. Thereby, it can suppress that the water which flows through the inner pipe main body 2 by the heat insulation layer 3 freezes, and can suppress that the outer peripheral surface of the heat insulation layer 3 becomes exposed by the outer pipe main body 1. Therefore, the outer tube main body 1 can suppress the heat insulating layer 3 from being deformed by an external impact.

  In the first embodiment, as described above, the inner pipe main body 2 is configured by screwing the screw part 24 b of the inner branch part 22 into the screw part 23 a of the inner straight pipe part 21. Thereby, in the outer pipe main body 1, the inner pipe main body 2 can be easily configured by engaging the screw portion 23 a of the inner straight pipe portion 21 and the screw portion 24 b of the inner branch portion 22.

  In the first embodiment, as described above, the screw portion 23a of the inner straight pipe portion 21 and the inner portion of the inner straight pipe portion 21 are engaged with the screw portion 23a of the inner straight pipe portion 21 and the screw portion 24b of the inner branch portion 22. An engagement portion between the branch portion 22 and the screw portion 24 b is sealed by the O-ring 25. Thereby, when water flows into the inner pipe main body 2, it is possible to prevent water from leaking from the engagement portion between the screw part 23 a of the inner straight pipe part 21 and the screw part 24 b of the inner branch part 22. .

  In the first embodiment, as described above, the heat insulating layer 3 is provided between the outer tube main body 1 and the inner tube main body 2 from the vicinity of both end portions 11c of the outer straight tube portion 11 and the upper end portion of the outer branch portion 12. It is provided up to about 12c. Thereby, the heat insulating layer 3 made of foamed polyurethane or the like is formed on the entire portion where the outer straight tube portion 11 and the inner straight tube portion 21 overlap and the entire portion where the outer branch portion 12 and the inner branch portion 22 overlap. Since it is injected (filled), it is possible to effectively suppress freezing of water flowing into the inner pipe main body 2. Further, the outer straight pipe portion 11 and the outer branch portion 12 can suppress the heat insulating layer 3 from being deformed by an external impact.

  Moreover, in 1st Embodiment, after attaching the cover member 6 so that the both ends 11c of the outer side straight pipe part 11 may be plugged as mentioned above, it consists of foaming polyurethane etc. from the injection hole 6b formed in the cover member 6. By injecting the heat insulating material, the heat insulating layer 3 made of foamed polyurethane or the like is formed. Thereby, since it can suppress that the heat insulating material inject | poured in the outer pipe | tube main body 1 protrudes outside by the cover member 6 attached to the both ends 11c of the outer side straight pipe part 11, an outer pipe | tube is easily The heat retaining layer 3 can be formed in the main body 1.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. In the second embodiment, the inner straight pipe portion is inserted when the inner straight pipe portion is inserted into the outer straight pipe portion due to the relatively small diameter of the outer straight pipe portion (the thickness of the heat retaining layer is thin). An insertion method in the case where it is difficult to insert a part of the tube in contact with the outer straight pipe portion will be described.

  In the tube 101 with a heat retaining layer according to the second embodiment, as shown in FIG. 11, when the diameter of the outer straight tube portion 111 is relatively small (the heat retaining layer is thin), the inner straight tube portion 21 is disposed outside. When inserting into the straight pipe portion 111, it is difficult to insert due to the corner portion 230 b of the branch joint 23 fused to the outer peripheral surface of the inner straight pipe portion 21 coming into contact with the outer straight pipe portion 111. It becomes. In this case, the lower end portion 11d of the outer straight pipe portion 111 can be opened in the radial direction by cutting the lower end portion 11d of the outer straight pipe portion 111 along the axial direction. As a result, the inner diameter of the outer straight pipe portion 111 can be increased. That is, the inner straight pipe portion 21 (branch joint 23) can be inserted into the outer straight pipe portion 111 while the lower end portion 11d of the outer straight pipe portion 111 is opened in the radial direction.

  And after inserting the inner side straight pipe part 21 in the outer side straight pipe part 111, as shown in FIG. 12, the cutting part is joined by welding the lower end part 11d of the outer side straight pipe part 111. As shown in FIG. In addition, the other structure and manufacturing method of 2nd Embodiment are the same as that of the said 1st Embodiment.

  As described above, according to the heat retaining layer-equipped tube 101 according to the second embodiment, the effects listed below can be obtained.

  In the second embodiment, as described above, when the screw part 23a is formed on the outer peripheral surface of the inner straight pipe part 21 and inserted into the outer straight pipe part 11, the inner straight pipe part 21 in which the screw part 23a is formed. Is difficult to insert into the outer straight pipe portion 11, a portion of the outer straight pipe portion 11 opposite to the outer branch portion 12 is cut in the axial direction (X direction) to obtain a cut portion (lower end portion 11d). ) In the radial direction, the inner straight pipe portion 21 is inserted into the outer straight pipe portion 11, and then the cut portion (lower end portion 11d) of the outer straight pipe portion 11 is joined by welding. Accordingly, when the radial length of the inner straight pipe portion 21 in which the screw portion 23a is formed is partially larger than the radial length of the outer straight pipe portion 11, the inner straight pipe portion 11 can be easily The inner straight pipe portion 21 can be accommodated in the inner wall. The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. In the third embodiment, unlike the first embodiment in which a heat insulating material is injected between the outer tube main body 1 and the inner tube main body 2 to provide a heat insulating layer as a whole, the outer straight pipe portion and the inner straight pipe portion are arranged. An example in which a heat insulating layer is provided between the pipe portion and a heat insulating sheet is provided between the outer branch portion and the inner branch portion will be described.

  In the tube 102 with a heat retaining layer according to the third embodiment, as shown in FIG. 13, a boundary portion 10 between the outer straight pipe portion 11 and the outer branch portion 12 among the outer tube main body 1 and the inner pipe main body 2. A heat insulating layer 3a formed by injecting a heat insulating material is provided in the lower part from the vicinity. Between the outer tube main body 1 and the inner tube main body 2, a belt-shaped heat insulating sheet 3 b is provided in the upper part from the vicinity of the boundary part 10 between the outer straight pipe part 11 and the outer branch part 12. The heat insulating sheet 3b is made of a foam or the like, and more specifically, is made of foamed polyurethane, foamed polyethylene, foamed polystyrene, or the like. This heat insulation sheet 3b suppresses freezing of water flowing from the vicinity of the boundary portion 10 between the outer straight tube portion 11 and the outer branch portion 12 between the outer tube main body 1 and the inner tube main body 2 from freezing. doing. The heat insulating sheet 3b is attached so as to integrally surround the outer periphery of the socket 26 and the nipple 27. Further, the outer peripheral surface of the heat insulating sheet 3 b is in full contact with the inner peripheral surface of the outer branch portion 12. The heat insulating layer 3a is an example of the “straight tube portion side heat insulating layer” of the present invention, and the heat insulating sheet 3b is an example of the “branch portion side heat insulating layer” of the present invention.

  As a method of attaching the heat insulating sheet 3b to the socket 26 and the nipple 27, in the step of forming the inner pipe main body 2, the heat insulating sheet 3b is inserted into the socket 26 before the inner branch portion 22 is inserted into the outer branch portion 12. And attached to the outer periphery of the nipple 27. Thereafter, the socket 26 and the nipple 27 (inner branch part 22) to which the heat insulating sheet 3b is attached are inserted into the outer branch part 12. Then, the screw part 24 b of the bushing 24 of the inner branch part 22 is screwed into the screw part 23 a of the branch joint 23 attached to the inner straight pipe part 21. Thereby, the inner straight pipe part 21 and the inner branch part 22 are fixed, and the inner pipe main body 2 is formed. Then, the heat insulating layer 3a is formed between the outer straight tube portion 11 and the inner straight tube portion 21 by injecting the heat insulating material in the same manner as the step of forming the heat insulating layer of the first embodiment described above. In addition, the other structure and manufacturing method of 3rd Embodiment are the same as that of the said 1st Embodiment.

  As described above, according to the heat retaining layer-equipped tube 102 according to the third embodiment, the effects listed below can be obtained.

  In 3rd Embodiment, while providing the thermal insulation layer 3a which consists of foaming polyurethane etc. between the outer side straight pipe part 11 and the inner side straight pipe part 21, as above-mentioned, between the outer side branch part 12 and the inner side branch part 22 Is provided with a heat insulating sheet 3b made of foamed polyurethane or the like. Thereby, it can suppress that the water which flows through the inner pipe main body 2 freezes with two types of heat retention layers (the heat retention layer 3a and the heat retention sheet 3b). The remaining effects of the third embodiment are similar to those of the aforementioned first embodiment.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG. In the fourth embodiment, an example in which stepped portions are provided at both ends of the outer straight pipe portion will be described.

  In the tube 103 with a heat retaining layer according to the fourth embodiment, an annular connection member 7 is disposed at each of both end portions 11 c of the outer straight tube portion 11. The diameter of the connecting member 7 is formed substantially equal to the diameter of the outer straight pipe portion 11. Further, the outer edge portion 7a of the connecting member 7 is bonded to both end portions 11c of the outer straight pipe portion 11 by hot melt (adhesive) or the like, and is then bonded by ultrasonic welding (ultrasonic welding).

  Further, the inner edge portion 7 b of the connecting member 7 is disposed at a predetermined interval from the outer peripheral surface of the inner straight pipe portion 21. In addition, an outer short tube portion 13 is disposed on a portion of the connecting member 7 opposite to the outer straight tube portion 11. The outer short tube portion 13 is formed smaller than the inner diameter of the outer straight tube portion 11 and shorter than the axial length of the outer straight tube portion 11. The end 13a on the connection member 7 side of the outer short tube portion 13 is bonded to the inner edge portion 7b of the connection member 7 by hot melt (adhesive) or the like, and then fused by ultrasonic fusion (ultrasonic welding). ing. As a result, a stepped portion 14 is formed between the outer straight tube portion 11 and the outer short tube portion 13.

  The step 14 is formed by inserting the inner straight pipe portion 21 into the outer straight pipe portion 11 and inserting the inner branch portion 22 into the outer branch portion 12 in the step of forming the inner pipe main body 2. Done after. And after the level | step-difference part 14 is formed, the heat insulation layer 3a is inserted between the outer side straight pipe part 11 and the inner side straight pipe part 21 by inject | pouring a heat insulating material between the outer pipe | tube main body 1 and the inner pipe | tube main body 2. Is formed, and a heat insulating layer 3 c is formed between the outer short tube portion 13 and the inner straight tube portion 21. The heat insulating layer 3c is an example of the “short tube portion side heat insulating layer” in the present invention. Moreover, in 4th Embodiment, although the example which provides the heat insulation sheet | seat 3b between the outer side branch part 12 and the inner side branch part 22 is shown, it is outside by providing a heat insulating material, without providing the heat insulation sheet | seat 3b. A heat insulating layer may be formed integrally with the heat insulating layers 3 a and 3 c between the branch portion 12 and the inner branch portion 22. In addition, the other structure and manufacturing method of 4th Embodiment are the same as that of the said 1st Embodiment.

  As described above, according to the tube 103 with a heat insulating layer according to the fourth embodiment, the effects listed below can be obtained.

  In the fourth embodiment, as described above, the heat insulating layer 3 c made of foamed polyurethane or the like is provided between the outer short tube portion 13 and the inner straight tube portion 21. Thereby, it can suppress that the heat retention layer 3c which consists of a polyurethane foam etc. by the outer short tube part 13 deform | transforms with respect to an external impact. The remaining effects of the fourth embodiment are similar to those of the aforementioned first embodiment.

-Other embodiments-
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first to fourth embodiments, an example in which the outer pipe main body is configured from the outer straight pipe part and the outer branch part extending in a substantially vertical direction with respect to the outer straight pipe part has been described. It is not limited to this. In the present invention, as long as the outer straight pipe part and the outer branch part are branched, the outer branch part is not limited to the case of extending in a substantially vertical direction with respect to the outer straight pipe part.

  Moreover, in the said 1st-4th embodiment, although the inner pipe | tube main body was shown from the inner side straight pipe part and the inner side branch part extended in a substantially perpendicular direction with respect to the inner side straight pipe part, the present invention showed It is not limited to this. In the present invention, as long as the inner straight pipe portion and the inner branch portion are branched, the inner branch portion is not limited to extending in a substantially vertical direction with respect to the inner straight pipe portion.

  Moreover, in the said 1st-4th embodiment, although the heat retention layer which consists of a foam was shown as an example of a heat retention layer, this invention is not limited to this. For example, as long as it is possible to suppress freezing of water flowing in the inner pipe main body, a heat insulating layer other than the foam may be used.

  Moreover, in the said 1st-4th embodiment, the branch joint which has a thread part in the outer peripheral surface of an inner straight pipe part as an example of the 1st engaging part of an inner straight pipe part, and the 2nd engaging part of an inner branch part Although the example which comprises a thread part in the lower end part of an inner side branch part and engages with each other thread part was shown, the present invention is not limited to this. For example, if it is possible to engage the inner straight pipe part and the inner branch part, a screw part may be formed directly on the outer peripheral surface of the inner straight pipe part and engaged with the screw part of the inner branch part. Good. Also, if it is possible to engage the inner straight pipe portion and the inner branch portion, the inner pipe main body is provided by engaging the inner straight pipe portion and the inner branch portion with engaging portions other than the threaded portions and engaging each other. May be configured.

  Moreover, in the said 1st-4th embodiment, although the O-ring was shown as an example of a sealing member, this invention is not limited to this. For example, as long as it is possible to seal between the inner straight pipe portion and the inner branch portion, a sealing member other than the O-ring may be used.

  Moreover, in the said 1st-4th embodiment, as an example of the process of forming an outer pipe | tube main body, after forming an outer straight pipe part and an outer side branch part separately by extrusion molding, it fuse | melts, and an outer pipe | tube is carried out. Although the example which forms a main body was shown, this invention is not limited to this. For example, as an example of the step of forming the outer tube main body, the outer tube main body can be integrally formed by injection molding or the like.

  INDUSTRIAL APPLICABILITY The present invention can be used for a tube with a heat insulating layer and a method for manufacturing the same, and more specifically, can be used for a tube with a heat insulating layer that prevents freezing of water in a water pipe and a method for manufacturing the same.

DESCRIPTION OF SYMBOLS 1 Outer tube main body 11 Outer straight pipe part 12 Outer branch part 13 Outer short pipe part 2 Inner pipe main body 21 Inner straight pipe part 22 Inner branch part 23a Thread part (1st engaging part, 1st thread part)
24b Screw part (second engagement part, second screw part)
25 O-ring (seal member)
3 Thermal insulation layer 3a Thermal insulation layer (straight pipe side thermal insulation layer)
3b Thermal insulation sheet (Branch side thermal insulation layer)
3c Thermal insulation layer (short pipe side thermal insulation layer)
6 Lid member 7 Connection member 100, 101, 102, 103 Tube with heat insulation layer

Claims (11)

An outer pipe main body including an outer straight pipe part and an outer branch part branched from the outer straight pipe part;
An inner pipe main body disposed in the outer pipe main body, including an inner straight pipe portion corresponding to the outer straight pipe portion, and an inner branch portion branching from the inner straight pipe portion and corresponding to the outer branch portion;
A tube with a heat insulating layer, comprising a heat insulating layer provided between the outer tube main body and the inner tube main body. In the tube with a heat insulating layer according to claim 1,
A first engagement portion is provided on the outer peripheral surface of the inner straight pipe portion of the inner tube main body,
In the vicinity of the end of the inner branch portion of the inner tube main body, a second engagement portion that engages with the first engagement portion of the inner straight tube portion is provided,
The inner tube main body is configured by engaging a first engagement portion of the inner straight tube portion with a second engagement portion of the inner branch portion, and the heat retaining layer-attached tube. In the tube with a heat insulating layer according to claim 2,
The first engaging part of the inner straight pipe part of the inner pipe main body includes a first screw part,
The second engagement portion of the inner branch portion of the inner tube main body includes a second screw portion that engages with the first screw portion of the inner straight tube portion,
The inner tube main body is constituted by a second threaded portion of the inner branch portion being screwed into a first threaded portion of the inner straight tube portion. In the tube with a heat insulating layer according to any one of claims 1 to 3,
The heat insulating layer provided between the outer tube main body and the inner tube main body is made of a foam,
Both end portions of the inner straight pipe portion are provided so as to protrude from both end portions of the outer straight pipe portion,
The heat insulating layer made of the foam is provided between the outer tube main body and the inner tube main body from the vicinity of both ends of the outer straight pipe portion to the vicinity of the upper end of the outer branch portion. A tube with a heat insulating layer. In the heat insulating tube according to any one of claims 1 to 4,
The outer pipe main body further includes an outer short pipe part having a diameter smaller than that of the outer straight pipe part via an annular connection member disposed at each of both ends of the outer straight pipe part,
The heat insulating layer further includes a short tube portion side heat insulating layer made of a foam provided between the outer short tube portion and the inner straight tube portion. Forming an outer tube main body including an outer straight tube portion and an outer branch portion branched from the outer straight tube portion;
An inner pipe body is formed which is inserted into the outer pipe body and includes an inner straight pipe portion corresponding to the outer straight pipe portion, and an inner branch portion branching from the inner straight pipe portion and corresponding to the outer branch portion. And a process of
And a step of forming a heat insulating layer by injecting a heat insulating material between the outer tube main body and the inner tube main body. In the manufacturing method of the pipe | tube with a heat insulating layer of Claim 6,
The step of forming the inner tube main body includes forming a first engagement portion on the outer peripheral surface of the inner straight tube portion and inserting the first engagement portion into the outer straight tube portion of the outer tube main body, and in the vicinity of the end of the inner branch portion. After the second engaging portion is formed and inserted into the outer branch portion of the outer tube main body, the first engaging portion of the inner straight tube portion and the second engaging portion of the inner branch portion are engaged. By this, the manufacturing method of the pipe | tube with a heat retention layer characterized by including the process of forming the said inner pipe | tube main body. In the manufacturing method of the pipe | tube with a heat insulation layer of Claim 7,
The first engaging part of the inner straight pipe part of the inner pipe main body includes a first screw part,
The second engagement portion of the inner branch portion of the inner tube main body includes a second screw portion that engages with the first screw portion of the inner straight tube portion,
The step of forming the inner pipe main body includes a step of forming the inner pipe main body by screwing the second screw portion of the inner branch portion into the first screw portion of the inner straight pipe portion. Manufacturing method of tube with heat insulation layer. In the manufacturing method of the pipe | tube with a heat retention layer of any one of Claims 6-8,
The step of forming the heat insulating layer includes the step of injecting a heat insulating material made of foam from an injection hole formed in the lid member after attaching the lid member so as to close both ends of the outer straight pipe portion. The manufacturing method of the pipe | tube with a heat insulating layer characterized by including the process of forming the heat insulating layer which consists of a foam between an outer pipe | tube main body and the said inner pipe | tube main body. In the manufacturing method of the pipe | tube with a heat retention layer of any one of Claims 6-9,
The step of forming the heat insulating layer includes a step of attaching a heat insulating sheet made of a foam to the outer peripheral surface of the inner branch portion during the step of forming the inner pipe main body. Injecting a heat insulating material made of foam between the outer tube main body and the inner tube main body after the step of forming the branch portion side heat insulating layer made of foam and the step of forming the inner tube main body And a step of forming a straight tube portion side heat insulating layer made of foam between the outer straight tube portion and the inner straight tube portion. In the manufacturing method of the pipe | tube with a heat retention of any one of Claims 6-10,
The step of forming the heat retaining layer is smaller in diameter than the outer straight pipe portion through an annular connecting member at each of both ends of the outer straight pipe portion after the step of forming the inner pipe main body. Foaming between the outer short tube portion and the inner straight tube portion is performed by fusing the outer short tube portion and injecting a heat insulating material made of a foam between the outer tube main body and the inner tube main body. The manufacturing method of the pipe | tube with a heat insulating layer characterized by further including the process of forming the short pipe part side heat insulating layer which consists of a body.

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