JP2020051607A - Expansion joint - Google Patents

Abstract

To provide an expansion joint that prevents condensation of its outer surface even when there is a shrinkage of a vertical tube or the like disposed inside.SOLUTION: An expansion joint 21 has a first tube material 27, and a hollow part 45 having a hollow layer S1 formed inside, the hollow layer covering the first tube material 27 from outside or inside in radial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an expansion joint.

  DESCRIPTION OF RELATED ART Conventionally, in the piping system etc. which discards drainage from a building, a joint is used for connecting a pair of vertical pipes, a pair of horizontal pipes, etc. (for example, refer patent document 1). For example, by disposing one of a pair of vertical pipes at one end of the joint and arranging the other of the pair of vertical pipes at the other end of the joint, the pair of vertical pipes is connected to each other.

JP-A-2006-109194

For example, when drain water (cold condensed water) discharged from an air conditioner is allowed to flow into a vertical pipe or the like, dew condensation may occur on the vertical pipe or the outer surface of a joint. For this reason, it has been practiced to provide a foamed layer on the joints and the vertical pipes to enhance the heat insulating performance of the joints and the vertical pipes and to prevent dew condensation on the outer surfaces thereof.
However, the axial length of the vertical pipe or the like may shrink due to, for example, a temperature change. Then, the length of the vertical pipe or the like disposed in the joint changes before the vertical pipe or the like contracts, and the heat insulation performance of a portion of the joint where the vertical pipe or the like is not disposed may be insufficient. . In this case, there is a possibility that dew condensation occurs on the outer surface of this portion.

  The present invention has been made in view of such a problem, and an object thereof is to provide an expansion joint in which the outer surface is prevented from dew condensation even when a vertical pipe or the like arranged inside shrinks. I do.

In order to solve the above problems, the present invention proposes the following means.
The expansion joint according to the present invention is characterized by comprising a first pipe material and a hollow portion in which a hollow layer that covers the first pipe material from the outside or inside in the radial direction is formed.
According to the present invention, an expansion joint is constructed by arranging a vertical pipe or the like having a foamed layer in each axial end of the first pipe material. Thereafter, when the vertical pipe or the like contracts in the axial direction from a predetermined length, the range between the end before the length of the vertical pipe or the like changes in the axial direction and the end after the change in the axial direction. The hollow layer is arranged so as to include the hollow layer. In general, since the heat insulation performance of the hollow layer is higher than the heat insulation performance of the foam layer and the heat insulation performance of the pipe material, the outer surface of the expansion joint is condensed even when the vertical tube or the like contracts and the expansion layer disappears inside the expansion joint. Can be suppressed.

In the above expansion joint, the first tube and the hollow portion may be transparent.
According to the present invention, the position of the vertical pipe or the like disposed in the first pipe member can be visually recognized through the first pipe member and the hollow portion from outside the expansion joint.

Further, in the above expansion joint, the hollow portion covers the first pipe material from the outside or inside in the radial direction, and the second pipe material in which the hollow layer is formed between the second pipe material and the first pipe material; A first annular member and a second annular member which are provided apart from each other in the axial direction of one tube member and close the hollow layer from both sides in the axial direction may be provided.
According to the present invention, a hollow layer can be formed by the second tubular member, the first annular member, and the second annular member.

In the above expansion joint, the second pipe material covers the first pipe material from the outside in the radial direction, and the first annular member is connected to an outer peripheral surface of the first pipe material, so that the second pipe material is formed. And the second annular member may be connected to an inner peripheral surface of the second pipe member and contact the first pipe member.
According to the present invention, the hollow layer can be formed by the member connecting the first tubular member and the first annular member and the member connecting the second tubular member and the second annular member.

In the above expansion joint, the second tubular member covers the first tubular member from the radially inner side, and the first annular member and the second annular member are respectively connected to an outer peripheral surface of the second tubular member. Then, each of the first pipe members may come into contact with the first pipe member.
According to the present invention, a hollow layer can be formed by the first tubular member and the hollow portion connecting the second tubular member, the first annular member, and the second annular member.

  ADVANTAGE OF THE INVENTION According to the expansion joint of this invention, even if the vertical pipe etc. arrange | positioned inside shrink, it can suppress that an outer surface dew condensation.

It is a longitudinal section of a piping system in which the expansion joint of a 1st embodiment of the present invention is used. It is the A section enlarged view in FIG. It is a longitudinal section of a piping system in which the expansion joint of the modification of a 1st embodiment of the present invention is used. It is a longitudinal section of a piping system in which the expansion joint of the modification of a 1st embodiment of the present invention is used. It is a longitudinal section of a piping system in which the expansion joint of a 2nd embodiment of the present invention is used. It is a longitudinal section of a piping system in which the expansion joint of a 3rd embodiment of the present invention is used. It is a longitudinal section of a piping system in which the expansion joint of a 4th embodiment of the present invention is used. It is a perspective view of an expansion joint of a 5th embodiment of the present invention. It is a longitudinal cross-sectional view of the expansion joint.

(1st Embodiment)
Hereinafter, a piping system in which the first embodiment of the expansion joint according to the present invention is used will be described with reference to FIGS.
As shown in FIG. 1, a piping system 1 is used for, for example, a building 11. An air conditioner (not shown) is connected to the piping system 1, and the piping system 1 discharges drain water generated by the air conditioner to the outside of the building 11.
The piping system 1 includes the expansion joint 21 of the present embodiment, a first vertical pipe (vertical pipe) 61, and a second vertical pipe (vertical pipe) 66. First, the vertical tubes 61 and 66 will be described below.

The first vertical tube 61 includes, for example, a non-foamed inner layer 62, a foamed layer 63, and a non-foamed outer layer 64.
The non-foamed inner layer 62, the foamed layer 63, and the non-foamed outer layer 64 are each formed in a tubular shape, and are arranged coaxially with each other. The foam layer 63 is fixed to the outer peripheral surface of the non-foamed inner layer 62. The non-foamed outer layer 64 is fixed to the outer peripheral surface of the foamed layer 63.
The non-foamed inner layer 62 and the non-foamed outer layer 64 are formed without foaming the vinyl chloride resin. The foam layer 63 is formed by foaming a foam layer thermoplastic resin composition containing a resin containing a vinyl chloride resin and a foaming agent.
The configuration of the first vertical pipe 61 is not limited to this, and the first vertical pipe may be configured by providing a heat insulating material on the outer peripheral surface of the vertical pipe formed without foaming the resin.
The second vertical pipe 66 includes a non-foamed inner layer 67, a foamed layer 68, and a non-foamed outer layer 69 which are configured similarly to the non-foamed inner layer 62, the foamed layer 63, and the non-foamed outer layer 64 of the first vertical pipe 61.

The expansion joint 21 includes a pipe main body 26, a first cap 41, and a second cap 51.
The tube main body 26 includes a first tube 27, a first annular member 28, a second tube 29, a locking portion 30, and a holding portion 31. The first pipe member 27 is formed in a circular tube shape. The first tube 27 is arranged so that the axial direction of the first tube 27 is along the vertical direction Z. The arrangement of the first tube 27 is not limited to this, and the first tube 27 may be arranged so that the axial direction of the first tube 27 intersects the vertical direction Z.

The inner diameter of the first pipe member 27 is constant regardless of the position in the vertical direction Z. The inner diameter of the first pipe member 27 and the outer diameter of the vertical pipes 61 and 66 are substantially equal to each other.
On the other hand, as shown in FIGS. 1 and 2, the outer diameter of the first pipe member 27 is larger at the end of the upper part (the other side in the axial direction) Z2 than at the end of the lower part (one side in the axial direction) Z1. . As a result, a step 27a is formed on the outer peripheral surface of the first tubular member 27 at the intermediate portion in the vertical direction Z. The step 27a is preferably formed over the entire circumference of the first pipe member 27.
Further, as shown in FIG. 1, a plurality of protrusions 27 b protruding radially outward of the first pipe material 27 are formed on the outer peripheral surface of the first pipe material 27 above Z2 above the step portion 27 a. . The plurality of protrusions 27b are arranged apart from each other in the vertical direction Z.

  An interval between the plurality of protrusions 27b is an interval for holding the expansion joint 21 on a wall surface by a support tool (shown by a two-dot chain line D in FIG. 1) having a holding portion. The holding portion of the support D holds the outer surface of the first pipe member 27 between the protrusions 27b, and the holding portion contacts the side surface of the protrusion 27b, so that the expansion joint 21 does not follow the expansion and contraction of the first vertical pipe 61. Fixed to

The first annular member 28 is formed in an annular shape. The first annular member 28 is arranged coaxially with the first tubular member 27 at a portion between the step portion 27a and the plurality of protrusions 27b on the outer peripheral surface of the first tubular member 27 in the vertical direction Z. The inner peripheral edge of the first annular member 28 is connected to the outer peripheral surface of the first tubular member 27.
The second pipe member 29 is formed in a circular tube shape. The second pipe member 29 is disposed coaxially with the first tube member 27, and covers an intermediate portion of the first tube member 27 in the vertical direction Z from the outside in the radial direction. The second pipe 29 is spaced apart from the first pipe 27 in the radial direction. The second pipe member 29 extends downward from the radially outer end of the first annular member 28 toward Z1. As shown in FIG. 2, the lower Z <b> 1 end of the second tubular member 29 is disposed above the stepped portion 27 a of the first tubular member 27 at Z <b> 2.
On the outer peripheral surface of the lower end portion of the second pipe member 29, a first locking portion 29a protruding outward in the radial direction is formed. The first locking portion 29a is preferably formed over the entire circumference of the second pipe member 29.

As shown in FIG. 1, the locking portion 30 is formed in an annular shape. The inner diameter of the locking portion 30 and the inner diameter of the first vertical pipe 61 are substantially equal to each other.
The locking portion 30 is disposed coaxially with the first tube 27 within the first tube 27. The outer peripheral edge of the locking portion 30 is fixed to the inner peripheral surface of the first tube 27. The lower surface of the locking portion 30 is formed flat and arranged along a horizontal plane. On the other hand, the upper surface of the locking portion 30 is gradually inclined downward Z1 as it approaches the axis of the first pipe member 27.
As shown in FIG. 2, in the up-down direction Z, the lower surface of the locking portion 30 and the end of the lower portion Z <b> 1 of the second tube 29 coincide with each other.

As shown in FIG. 1, the holding portion 31 is formed in a cylindrical shape. The holding portion 31 is disposed coaxially with the first tube 27 so as to cover the upper end of the first tube 27 from the outside in the radial direction. The lower end of the holding portion 31 is fixed to the outer peripheral surface of the upper end of the first pipe member 27. The upper end of the holding portion 31 protrudes above the first pipe member 27 in the Z2 direction.
On the outer peripheral surface of the upper end of the holding portion 31, a second locking portion 31a protruding outward in the radial direction is formed. The second locking portion 31a is preferably formed over the entire circumference of the holding portion 31.
The pipe main body 26 configured as described above is integrally formed without foaming a vinyl chloride resin or the like. In this case, the color of the tube main body 26 is colored gray, black, or the like.

A first sealing member 33 is held inside the upper end of the holding portion 31 in the radial direction. The first sealing member 33 is formed in an annular shape, and is disposed coaxially with the holding unit 31. In a natural state in which no external force acts on the first sealing member 33, the inner diameter of the first sealing member 33 is smaller than the inner diameter of the first tube 27. The first sealing member 33 is made of, for example, a resin softer than the pipe main body 26.
The first sealing member 33 is disposed above the first pipe member 27 at Z2.

The first cap 41 has a second annular member 42 and a first peripheral wall 43.
The second annular member 42 is formed in an annular shape, and is arranged coaxially with the first pipe member 27. The second annular member 42 is spaced apart from the first annular member 28 in a downward direction Z1. In a natural state in which no external force acts on the second annular member 42, the upper surface of the second annular member 42 is formed flat and arranged along a horizontal plane. In FIG. 2, the shape of the upper surface of the second annular member 42 in the natural state is indicated by a two-dot chain line.
At the inner peripheral edge of the lower surface of the second annular member 42, a concave portion 42a that is concave toward the upper side Z2 is formed. The concave portion 42a opens toward the inside in the radial direction. By forming the concave portion 42a in the second annular member 42, the length in the vertical direction Z is shorter at the inner peripheral edge of the second annular member 42 than at the portion other than the inner peripheral edge of the second annular member 42 ( A thin portion 42b (having a small thickness) is formed. The thin portion 42b is more easily deformed in the vertical direction Z than the portion other than the thin portion 42b in the second annular member 42. The thin portion 42b is formed on the upper surface of the inner peripheral edge of the second annular member 42. The thin portion 42b is preferably formed over the entire circumference of the second annular member 42.
The inner diameter of the second annular member 42 and the outer diameter of the lower end of Z1 below the step 27a of the first tubular member 27 are substantially equal to each other. The outer diameter of the thin portion 42b is larger than the outer diameter of the upper end of Z2 above the step portion 27a of the first pipe member 27.

As shown in FIGS. 1 and 2, the first peripheral wall portion 43 is formed in a cylindrical shape, and is disposed coaxially with the second annular member 42. The first peripheral wall portion 43 extends from the outer peripheral edge of the second annular member 42 upward Z2. The inner diameter of the first peripheral wall portion 43 is larger than the outer diameter of the second pipe material 29.
On the inner peripheral surface at the upper end of the first peripheral wall portion 43, a first locked portion 43a protruding inward in the radial direction is formed. The first locked portion 43a is preferably formed over the entire circumference of the holding portion 31. The inner diameter of the first locked portion 43a and the outer diameter of the second pipe member 29 are substantially equal to each other.
The first cap 41 configured as described above is integrally formed of a resin such as polypropylene (PP). The first cap 41 may be formed of a resin such as polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), and vinyl chloride.

The first cap 41 is fitted to the lower end of the second tube 29 of the tube main body 26.
More specifically, the second annular member 42 of the first cap 41 is in contact with the lower surface of the second pipe member 29 from below the lower surface Z1. The thin portion 42b of the second annular member 42 is in contact with the step 27a of the first tubular member 27 from below Z1 of the step 27a. Since the stepped portion 27a is disposed below the lower end of the second tubular member 29 at Z1, the inner peripheral edge side of the second annular member 42 is bent toward the lower portion Z1, and the elasticity of the second annular member 42 causes the stepped portion 27a. The thin portion 42b is in strong contact with
Therefore, the airtightness between the step portion 27a of the first pipe member 27 and the thin portion 42b of the first cap 41 can be improved. Further, even if the shape of the first cap 41 is distorted, the step portion 27a and the thin portion 42b can be reliably brought into contact. Since the thin portion 42b is more easily deformed than the portion other than the thin portion 42b in the second annular member 42, the thin portion 42b can be easily deformed.

The first peripheral wall portion 43 of the first cap 41 is arranged coaxially with the second pipe member 29 and covers the second pipe member 29 from the outside in the radial direction. As shown in FIG. 2, the first locked portion 43 a of the first peripheral wall portion 43 is locked to the first locking portion 29 a of the second pipe material 29 from above Z <b> 2 of the first locking portion 29 a.
Thus, the first cap 41 is fitted on the lower end of the second pipe member 29.

As shown in FIG. 1, a hollow layer that covers the first pipe member 27 from the outside in the radial direction by the first annular member 28, the second pipe member 29, and the second annular member 42 of the first cap 41 that constitute the tube main body 26. A hollow portion 45 in which S1 is formed is configured. The hollow layer S <b> 1 is formed between the first tube 27 and the second tube 29. The annular members 28 and 42 cover the hollow layer S1 from both sides in the vertical direction Z. The hollow layer S1 is formed of a fluid (gas) such as air. The hollow portion 45 (hollow layer S1) is formed in an annular shape over the entire circumference of the first tubular member 27. The hollow layer S1 covers an intermediate portion of the first pipe member 27 in the vertical direction Z.
Generally, the heat insulating performance of the hollow layer is higher than the heat insulating performance of the foam layer of the pipe formed of resin or metal and the heat insulating performance of the pipe material.
The upper end of the hollow layer S1 extends to Z2 above the upper surface of the locking portion 30. As shown in FIG. 2, in the vertical direction Z, the lower end of the hollow layer S <b> 1 and the lower surface of the locking portion 30 substantially match each other.

As shown in FIG. 1, the second cap 51 includes a third annular member 52 and a second peripheral wall 53.
The third annular member 52 is formed in an annular shape, and is arranged coaxially with the first pipe member 27. The inner diameter of the third annular member 52 and the outer diameter of the second vertical pipe 66 are substantially equal to each other.
The second peripheral wall 53 is formed in a cylindrical shape, and is disposed coaxially with the third annular member 52. The second peripheral wall portion 53 extends from the outer peripheral edge of the third annular member 52 downward Z1. The inner diameter of the second peripheral wall portion 53 is larger than the outer diameter of the holding portion 31.
A second locked portion 53a protruding radially inward is formed on the inner peripheral surface at the lower end of the second peripheral wall portion 53. The second locked portion 53a is preferably formed over the entire circumference of the second peripheral wall portion 53. The inner diameter of the second locked portion 53a and the outer diameter of the holding portion 31 are substantially equal to each other.
The second cap 51 configured as described above is integrally formed of the same material as the first cap 41.

The second cap 51 is fitted on the upper end of the holding portion 31 of the tube main body 26.
More specifically, the third annular member 52 of the second cap 51 is in contact with the upper surface of the holding portion 31 from above the upper surface Z2.
The second peripheral wall portion 53 of the second cap 51 is arranged coaxially with the holding portion 31 and covers the holding portion 31 from the outside in the radial direction. The second locked portion 53a of the second peripheral wall portion 53 is locked to the second locking portion 31a of the holding portion 31 from below Z2 of the second locking portion 31a.
Thus, the second cap 51 is fitted to the upper end of the holding section 31.

An annular second sealing member 56 is disposed below the locking portion 30 in the first pipe member 27 below Z1. The inner diameter and the outer diameter of the second sealing member 56 are substantially the same as the inner diameter and the outer diameter of the first vertical pipe 61, respectively. The second sealing member 56 is formed of the same material as the first sealing member 33. The second sealing member 56 is in contact with the lower surface of the locking portion 30 from below Z1 of the locking portion 30.
The above-mentioned first vertical pipe 61 is arranged so that its axis is along the vertical direction Z. The upper end of the first vertical pipe 61 is arranged inside the lower end of the first pipe 27. The first vertical pipe 61 is in contact with the second sealing member 56 from below Z <b> 1 of the second sealing member 56. The first vertical pipe 61 is locked to the locking portion 30 via the second sealing member 56, so that movement of the first vertical pipe 61 upward Z2 with respect to the pipe main body 26 is restricted. The space between the locking portion 30 and the first vertical tube 61 is watertightly sealed by the second sealing member 56.
In the vertical direction Z, the lower end of the hollow layer S1 extends downward Z1 to a position equivalent to the lower end of the second sealing member 56 or to a position Z1 below the lower end of the second sealing member 56. Is also good.
Further, the second sealing member 56 does not necessarily have to be provided on the expansion joint 21.

The second vertical pipe 66 is arranged so that the axis is along the vertical direction Z. The lower end of the second vertical pipe 66 is arranged inside the upper end of the first pipe 27. When arranging the second vertical pipe 66 in the first sealing member 33, the first sealing member 33 is elastically deformed, and the inner diameter of the first sealing member 33 is increased. And the second vertical pipe 66 are sealed watertight.
The lower end of the second vertical tube 66 is disposed at the middle of the hollow layer S1 in the vertical direction Z. The lower end of the second vertical tube 66 and the lower end of the hollow layer S1 are separated by a distance L1 in the vertical direction Z. The lower end of the second vertical pipe 66 and the upper end of the hollow layer S1 are separated by a distance L2 in the vertical direction Z.
The distance L <b> 1 is set such that the second vertical pipe 66 does not come into contact with the locking portion 30 even when the constructed second vertical pipe 66 extends in the vertical direction Z. On the other hand, the distance L2 is set such that the lower end of the second vertical pipe 66 is not disposed above the upper end of the hollow layer S1 Z2 even if the constructed second vertical pipe 66 contracts in the vertical direction Z. . In other words, in the vertical direction Z, the hollow layer S1 is arranged so as to include a range between the lower end before the length of the second vertical pipe 66 changes and the lower end after the change.

In the piping system 1 constructed as described above, after the construction, the second vertical pipe 66 contracts in the vertical direction Z, and the second vertical pipe 66 moves upward Z2 with respect to the pipe main body 26. Also, if the moving distance is equal to or less than the distance L2, there is a portion overlapping the second vertical pipe 66 and the hollow layer S1 in the vertical direction Z. For this reason, even if cold drain water flows in the piping system 1, the heat of the drain water is less likely to be transmitted to the outer surface of the expansion joint 21, and the outer surface of the expansion joint 21 is less likely to condense.
On the other hand, even if the second vertical pipe 66 extends in the up-down direction Z after being installed and the second vertical pipe 66 moves downward Z1 with respect to the pipe main body 26, the moving distance is not more than the distance L1. In this case, the second vertical pipe 66 does not contact the locking portion 30 of the pipe main body 26. Accordingly, it is possible to prevent the second vertical pipe 66 from contacting the locking portion 30 and applying a stress to the second vertical pipe 66.

As described above, according to the expansion joint 21 of the present embodiment, the vertical pipes 61 and 66 are arranged in each end of the first pipe 27 in the vertical direction Z. At this time, when the second vertical pipe 66 contracts in the vertical direction Z from a predetermined length, the lower end before and after the length of the second vertical pipe 66 changes in the vertical direction Z. And the hollow layer S1 is arranged so as to include the range between. In general, the heat insulation performance of the hollow layer is higher than the heat insulation performance of the foam layer and the heat insulation performance of the pipe material, so that the second vertical pipe 66 contracts and the foam layer 68 of the second vertical pipe 66 is formed inside the expansion joint 21. Even when the expansion joint 21 disappears, it is possible to suppress dew condensation on the outer surface of the expansion joint 21.
Since the hollow portion 45 includes the first annular member 28, the second tubular member 29, and the second annular member 42, the first annular member 28, the second tubular member 29, and the second annular member 42 form the hollow layer S1. be able to.

In addition, the first pipe member 27 and the hollow portion 45 constituting the expansion joint 21 may be transparent. The term “transparent” used herein includes colorless transparent and colored transparent. In this case, the expansion joint 21 can be formed of an acrylic resin, a polycarbonate resin, or the like.
By configuring like the expansion joint 21 of this modified example, the positions of the vertical pipes 61 and 66 arranged in the first pipe member 27 can be transmitted from the outside of the expansion joint 21 to the first pipe member 27 and the hollow portion 45, respectively. And can be visually recognized.
Note that the first cap 41, the locking portion 30, and the like do not have to be transparent.

Like the expansion joint 21A of the piping system 1A shown in FIG. 3, a first cap 76 may be provided instead of the first cap 41 of the expansion joint 21 of the present embodiment. In this modification, the first locking portion 29a is not formed on the second pipe member 29.
The first cap 76 includes a second annular member 77, a first peripheral wall 78, and a third peripheral wall 79.
The second annular member 77 is formed in an annular shape similarly to the second annular member 42, and is arranged coaxially with the first pipe member 27. The outer diameter of the second annular member 77 and the outer diameter of the second tubular member 29 are substantially equal to each other. The inner peripheral edge of the second annular member 77 is in contact with the step 27a of the first pipe member 27 from below Z1 of the step 27a.

The peripheral wall portions 78 and 79 are each formed in an annular shape, and are arranged coaxially with the second annular member 77. The first peripheral wall portion 78 is fixed to an inner peripheral edge on the upper surface of the second annular member 77. The inner diameter of the first peripheral wall portion 78 and the outer diameter of a portion of the first pipe member 27 at a position Z2 above the step portion 27a are substantially equal to each other. The first peripheral wall portion 78 is in contact with the outer peripheral surface of the first tubular member 27 above the stepped portion 27a at a position Z2.
The third peripheral wall portion 79 is fixed to a radially intermediate portion on the upper surface of the second annular member 77 so as to cover the first peripheral wall portion 78 from the outside in the radial direction. The outer diameter of the third peripheral wall portion 79 and the inner diameter of the second tubular material 29 are substantially equal to each other. The outer peripheral surface of the third peripheral wall portion 79 is in contact with the inner peripheral surface of the second pipe member 29.
The first cap 76 is formed of the same material as the first cap 41.

  The pipe members 27 and 29 and the first cap 76 are fixed to each other by a connection portion (not shown) formed by a known adhesive or adhesive. By the first annular member 28, the second tubular member 29, and the second annular member 77 of the first cap 76 that constitute the tube main body 26, a hollow layer S2 that covers the first tubular member 27 from the outside in the radial direction is formed inside. A hollow portion 81 is configured.

With the expansion joint 21A of the modified example configured as described above, the same effect as the expansion joint 21 of the present embodiment can be obtained.
Further, by connecting the pipes 27, 29 and the first cap 76 at the connection portion, the airtightness between the pipes 27, 29 and the first cap 76 can be improved.

Further, like the expansion joint 21B of the piping system 1B shown in FIG. 4, a foam material (second annular member) 86 may be provided instead of the first cap 76 of the expansion joint 21A of the modified example.
In this modification, a step portion 29b is formed on the inner peripheral surface of the second pipe member 29. The inner diameter of a portion Z1 below the step portion 29b in the second pipe member 29 is larger than the inner diameter of a portion Z2 above the step portion 29b in the second tube member 29. The step 29b and the step 27a of the first pipe member 27 have the same position in the vertical direction Z.

The foam material 86 is formed in an annular shape, and is arranged coaxially with the first tube material 27. The foam material 86 is formed of a non-breathable foam material such as foamed polyethylene and foamed rubber.
The foam material 86 is arranged between the first tube material 27 and the second tube material 29. The foam material 86 is locked to the steps 27a and 29b from below Z1 of the steps 27a and 29b. The lower surface of the foam material 86 and the lower end surface of the second pipe material 29 are flush.
The pipe members 27 and 29 and the foam material 86 are fixed to each other by the above-mentioned connecting portion (not shown).

The first annular member 28, the second pipe member 29, and the foam material 86 constituting the pipe main body 26 form a hollow portion 88 in which a hollow layer S3 that covers the first pipe member 27 from the outside in the radial direction is formed. .
With the expansion joint 21B of the modified example configured as described above, the same effect as the expansion joint 21 of the present embodiment can be obtained.

(2nd Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 5. However, the same portions as those in the above embodiment will be denoted by the same reference numerals, and the description thereof will be omitted. Only different points will be described.
As shown in FIG. 5, the expansion joint 91 of the present embodiment used for the piping system 2 includes a first pipe main body 96, a second pipe main body 106, and a second cap 51.

The first pipe main body 96 includes a first pipe member 27, a first annular member 98, and a first spacer 99.
The first annular member 98 is formed in an annular shape, and is arranged coaxially with the first pipe member 27. The first annular member 98 extends radially outward from an intermediate portion of the outer peripheral surface of the first pipe member 27 in the vertical direction Z. The first annular member 98 is connected to the first tube 27.
The first spacer 99 is formed in a cylindrical shape, and is arranged coaxially with the first pipe member 27. The first spacer 99 extends upward from the radially intermediate portion of the upper surface of the first annular member 98 toward Z2. A gap is formed between the first spacer 99 and the first pipe member 27 in the radial direction.

The second pipe main body 106 includes a second pipe member 107, a second annular member 108, and a holding unit 109.
The second pipe 107 is formed in a cylindrical shape, and is arranged coaxially with the first pipe 27. The second tube 107 covers the first tube 27 from the outside in the radial direction. The inner diameter of the second pipe member 107 and the outer diameter of the first spacer 99 are substantially equal to each other. The outer diameter of the second pipe member 107 and the outer diameter of the first annular member 98 are substantially equal to each other. The first spacer 99 is fitted into the second pipe member 107, and the lower end of the second pipe member 107 is in contact with the upper surface of the first annular member 98.
The second annular member 108 is formed in an annular shape, and is arranged coaxially with the second pipe member 107. The second annular member 108 extends radially inward from the inner peripheral surface at the upper end of the second tubular member 107. The second annular member 108 is connected to the upper end of the second pipe 107. The inner diameter of the second annular member 108 and the inner diameter of the first tube 27 are substantially equal to each other. The lower surface of the second annular member 108 is in contact with the upper end of the first tube 27 from above the first tube 27. The second annular member 108 is arranged so as to be separated from the first annular member 98 upward Z2.

The first pipe main body 96 and the second pipe main body 106 are fixed to each other by the above-described connecting portion (not shown).
The hollow layer S5 that covers the first pipe member 27 from the outside in the radial direction is formed by the first annular member 98 forming the first pipe main body 96 and the second pipe member 107 and the second annular member 108 forming the second pipe main body 106. A hollow portion 111 formed inside is configured.
The second tubular member 107, the first annular member 98, and the second annular member 108 surround the hollow layer S5 together with the first tubular member 27.

The holding portion 109 is formed in an annular shape, and is fixed to the upper surface of the second annular member 108. The first sealing member 33 is held on the inner peripheral surface side of the holding section 109. On the outer peripheral surface of the holding portion 109, a second locking portion 109a configured similarly to the second locking portion 31a of the holding portion 31 is formed.
The second cap 51 is fitted on the upper end of the holding portion 109 of the second pipe main body 106.

As described above, according to the expansion joint 91 of the present embodiment, even when the vertical pipes 61 and 66 arranged inside contract, the outer surface can be prevented from dew condensation.
Furthermore, the hollow layer S5 is formed by the first pipe main body 96 connecting the first pipe member 27 and the first annular member 98 and the second pipe main body 106 connecting the second pipe member 107 and the second annular member 108. be able to.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 6, but the same portions as those in the above embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.
As shown in FIG. 6, the expansion joint 116 of the present embodiment used for the piping system 3 includes a pipe main body 121, a hollow portion 131, and a second cap 51.

The tube main body 121 includes a first tube 122, a third annular member 123, and a third tube 124.
The first pipe member 122 is formed in a tubular shape. The first pipe member 122 is arranged such that the axial direction of the first pipe member 122 is along the vertical direction Z. Note that the direction in which the first pipe member 122 is arranged is not limited to this.
On the outer peripheral surface of the upper end of the first tubular member 122, a second locking portion 122a configured similarly to the second locking portion 31a of the holding portion 31 is formed.
The third annular member 123 is formed in an annular shape, and is arranged coaxially with the first pipe member 122. The third annular member 123 protrudes radially inward from the lower end of the first tubular member 122.
The third tubular member 124 is formed in a circular tubular shape, and is disposed coaxially with the third annular member 123. The third pipe member 124 extends downward from the inner peripheral edge of the third annular member 123 toward Z1. The inner diameter of the third pipe member 124 and the outer diameter of the first vertical pipe 61 are substantially equal to each other.

The hollow portion 131 includes a second tubular member 132, a first annular member 133, and a second annular member 134.
The second tube 132 is formed in a circular tube shape and is arranged coaxially with the first tube 122. The second tube member 132 covers the first tube member 122 from the inside in the radial direction. The inner diameter of the second pipe member 132 and the outer diameter of the second vertical pipe 66 are substantially equal to each other.
The first annular member 133 is formed in an annular shape, and is arranged coaxially with the second tubular member 132. The first annular member 133 protrudes radially outward from the outer peripheral surface of the lower end of the second tubular member 132. The first annular member 133 is connected to the second pipe 132. The first annular member 133 is in contact with the inner peripheral surface of the first pipe member 122 from the radial inside.
The second annular member 134 is formed in an annular shape, and is arranged coaxially with the second tubular member 132. The second annular member 134 protrudes radially outward from the outer peripheral surface of the upper end of the second tubular member 132. The second annular member 134 is connected to the second pipe 132. The second annular member 134 is disposed so as to be separated from the first annular member 133 in the upward direction Z2. The second annular member 134 is in contact with the inner peripheral surface of the first pipe member 122 from the inside in the radial direction. The upper end of the second annular member 134 is disposed below the upper end of the first tube member 122 of the tube main body 121 at Z1.

The cross-sectional shape of the hollow portion 131 including the axis of the first pipe member 122 is formed in a C-shape that opens outward in the radial direction.
The second tubular member 132, the first annular member 133, and the second annular member 134 that constitute the hollow portion 131 form a hollow layer S7 that covers the first tubular member 122 from the radial inside.
The tube main body 121 and the hollow portion 131 may be fixed to each other by the above-described connecting portion, or may not be fixed to each other.

The first sealing member 33 is held radially inside the first pipe member 122 and above Z <b> 2 above the hollow portion 131.
The second cap 51 is fitted on the upper end of the first tube member 122 of the tube body 121.

As described above, according to the expansion joint 116 of the present embodiment, even if the vertical pipes 61 and 66 arranged inside contract, the outer surface can be prevented from dew condensation.
Further, the hollow layer S7 can be formed by the first tube member 122 of the tube main body 121 and the hollow portion 131 in which the second tube member 132, the first annular member 133, and the second annular member 134 are connected to each other.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. 7, but the same parts as those in the above embodiment will be denoted by the same reference numerals, and description thereof will be omitted. Only different points will be described.
As shown in FIG. 7, the piping system 4 includes vertical pipes 61 and 66, an expansion joint 141 of the present embodiment, and a drain trap 151.

The expansion joint 141 is configured such that, in the expansion joint 21 of the first embodiment, the lower Z1 end of the second pipe 29 extends to near the lower Z1 end of the first pipe 27. The hollow layer S1 extends below the locking portion 30 to Z1.
The upper end of the connection pipe (vertical pipe) 146 is arranged in the lower end of the first pipe 27 of the expansion joint 141. The connection pipe 146 is a resin drain pipe having no foam layer.

The configuration of the drain trap 151 is not particularly limited as long as it can prevent the backflow of the drain water. For example, the drain trap 151 includes a trap body 152, a lid 153, a trap 154, a reduced diameter portion 155, and an upper receiving port 156. In addition, the lid unit 153, the trap unit 154, and a connecting member 159 described later constitute a trap unit 157.
The upper receiving port 156, the reduced diameter portion 155, and the trap main body 152 are arranged in the order of the upper receiving port 156, the reduced diameter portion 155, and the trap main body 152 from the upper part Z2 to the lower part Z1.

The trap body 152 is formed in a cylindrical shape extending along the vertical direction Z. An opening 152 a penetrating through the trap body 152 in the radial direction is formed on a side surface of the trap body 152.
The lid 153 is formed in a bottomed cylindrical shape. The lid 153 is arranged so that the bottom wall faces inward in the radial direction, and is fitted into the opening 152 a of the trap body 152.
The lid 153 is detachably attached to the opening 152a of the trap body 152, and seals the opening 152a of the trap body 152.
The trap portion 154 is disposed in the trap body 152 so as to be separated from the inner peripheral surface of the trap body 152. The trap unit 154 is a funnel-shaped receiving container formed of a flexible material such as silicone rubber.

The trap section 154 is connected to the lid section 153 via a connecting member 159. The connecting member 159 can pass through the opening 152a of the trap body 152.
The reduced diameter portion 155 is provided at the upper end of the trap body 152. For example, the reduced diameter portion 155 is formed in a cylindrical shape extending along the vertical direction Z. The outer diameter and the inner diameter of the reduced diameter portion 155 gradually increase, respectively, as going upward Z2.
The upper receiving port 156 is provided at the upper end of the reduced diameter portion 155. The upper receiving port 156 is formed in a cylindrical shape, and extends upward from the outer edge of the reduced diameter portion 155 toward Z2. The upper receiving port 156 has a foamed resin layer 156a inside.
The inner diameter of the upper receiving port 156 and the outer diameter of the connection pipe 146 are equivalent to each other. The lower end of the connection pipe 146 is disposed in the upper receiving port 156.

A lower port 160 is provided at the lower end of the trap body 152. The inner diameter of the lower receiving port 160 and the outer diameter of the first vertical pipe 61 are substantially equal to each other. The upper end of the first vertical tube 61 is disposed in the lower receiving port 160 via the third sealing member 161. The drain trap 151 does not need to include the third sealing member 161.
In this example, in the vertical direction Z, a region where the upper receiving port 156 of the drain trap 151 and the connection pipe 146 overlap with each other is insulated by the foamed resin layer 156a of the upper receiving port 156.
In the drain trap 151 configured as described above, the trap unit 157 is detachable from the trap main body 152.

  Even with the expansion joint 141 of the present embodiment described above, even if the second vertical pipe 66 and the connection pipe 146 arranged inside contract, the condensation on the outer surface can be suppressed.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9, but the same parts as those in the above embodiment will be denoted by the same reference numerals, and the description thereof will be omitted. explain.
As shown in FIGS. 8 and 9, the expansion joint 171 of the present embodiment includes a first pipe 27, a hollow portion 176, and a second cap 51.
The hollow portion 176 is a cover that covers the first pipe member 27 from the outside in the radial direction, and is formed in a cylindrical shape as a whole. The hollow part 176 is constituted by a pair of divided bodies 177 formed by dividing the hollow part 176 into two on a plane including the central axis of the hollow part 176.
Each divided body 177 includes a tubular piece 178, a first annular member piece 179, and a second annular member piece 180.

The tubular piece 178 covers the first pipe member 27 from the outside in the radial direction. The pair of tubular pieces 178 constitute a second tubular material 178A. That is, the pair of tubular pieces 178 are configured by dividing the second pipe 178A in the circumferential direction.
The first annular member 179 is formed in a semi-annular shape. The first annular member piece 179 extends radially inward from the upper end of the tubular piece 178. The pair of first annular member pieces 179 constitute a first annular member 179A.
A flange 183 projecting upward Z2 is formed at a radially inner end of the first annular member 179.
The second annular member 180 is formed in a semi-annular shape. The second annular member 180 extends radially inward from the lower end of the tubular piece 178. A pair of second annular member pieces 180 constitutes a second annular member 180A.
A flange 184 projecting downward Z1 is formed at a radially inner end of the second annular member 180.

Each divided body 177 is integrally formed of resin or the like. Each divided body 177 is fixed to the first pipe member 27 by an adhesive (not shown) disposed between the outer peripheral surface of the first pipe member 27 and the flanges 183 and 184.
A hollow layer S9 is formed between the second tube 178A and the first tube 27 of the hollow portion 176.

  Even with the expansion joint 171 of the present embodiment described above, even if the vertical pipe arranged inside shrinks, it is possible to suppress condensation on the outer surface.

As described above, the first to fifth embodiments of the present invention have been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the configuration does not deviate from the gist of the present invention. Change, combination, deletion, etc. are also included. Further, it goes without saying that the configurations shown in the embodiments can be used in appropriate combinations.
For example, in the first to fifth embodiments, the first pipe and the second pipe are integrally formed by a gas injection method to form an expansion joint having a hollow layer, and the expansion joint has a diameter larger than that of the hollow layer. The inner part in the direction may be the first pipe, and the outer part of the expansion joint in the radial direction from the hollow layer may be the second pipe.

The expansion joint need not include the locking portion 30, the first sealing member 33, and the second cap 51.
Although the pipe connected by the expansion joint is a pair of vertical pipes, it may be a pair of horizontal pipes.

21, 21A, 21B, 91, 116, 141, 171 Expansion joint 27, 122 First pipe 28, 98, 133, 179A First annular member 29, 107, 132, 178A Second pipe 42, 77, 108, 134, 180A second annular member 45, 81, 88, 111, 131, 176 hollow portion 86 foam material (second annular member)
S1, S2, S3, S5, S7, S9 hollow layer

Claims (5)

A first tube,
A hollow portion in which a hollow layer that covers the first pipe material from the outside or inside in the radial direction is formed,
An expansion joint comprising:   The expansion joint according to claim 1, wherein the first pipe member and the hollow portion are each transparent. The hollow portion,
A second pipe member that covers the first tube member from the outside or the inside in the radial direction, and the hollow layer is formed between the first tube member and the first tube member;
A first annular member and a second annular member that are provided apart from each other in the axial direction of the first pipe member and block the hollow layer from both sides in the axial direction;
The expansion joint according to claim 1 or 2, further comprising: The second tube material covers the first tube material from the outside in the radial direction,
The first annular member is connected to an outer peripheral surface of the first tube, and contacts the second tube,
4. The expansion joint according to claim 3, wherein the second annular member is connected to an inner peripheral surface of the second pipe, and contacts the first pipe. 5. The second pipe material covers the first pipe material from the inside in the radial direction,
4. The expansion joint according to claim 3, wherein the first annular member and the second annular member are respectively connected to an outer peripheral surface of the second tubular member, and each contact the first tubular member. 5.

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