JP7442261B2 - Expansion joints - Google Patents

Description

The present invention relates to an expansion joint.

Conventionally, in piping systems for disposing of wastewater from buildings, joints are used to connect a pair of vertical pipes, a pair of horizontal pipes, etc. (see, for example, Patent Document 1). For example, the pair of vertical tubes are connected to each other by arranging one of the pair of vertical tubes at one end of the joint and the other of the pair of vertical tubes at the other end of the joint.

Japanese Patent Application Publication No. 2016-109194

For example, if drain water (cold condensed water) discharged from an air conditioner is allowed to flow inside a vertical pipe or the like, dew may form on the outer surface of the vertical pipe or a joint. For this reason, a foam layer is provided on the joints, vertical pipes, etc. to improve the heat insulation performance of the joints, vertical pipes, etc., and to prevent dew condensation on their outer surfaces.
However, the axial length of the vertical tube etc. may shrink due to temperature changes, for example. As a result, the length of the vertical pipes, etc. placed inside the joint changes compared to before the vertical pipes, etc. contracted, and the insulation performance of the parts of the joint where the vertical pipes, etc. are not placed inside may become insufficient. . In this case, there is a possibility that dew condensation may form on the outer surface of this portion.

The present invention was made in view of these problems, and an object of the present invention is to provide an expansion joint that suppresses dew condensation on the outer surface even if the vertical pipe etc. disposed inside the joint contract. do.

In order to solve the above problems, the present invention proposes the following means.
The expansion joint of the present invention includes a first pipe material in which an end of a vertical pipe is disposed, a hollow part in which a hollow layer covering the first pipe material from the outside or inside in the radial direction is formed, and the first pipe material . a locking part fixed to an inner circumferential surface of a first pipe material, the hollow part covers the first pipe material from the outside or inside in the radial direction, and the hollow layer is provided between the first pipe material and the first pipe material. a second tubular member formed, and a first annular member and a second annular member that are provided apart from each other in the axial direction of the first tubular member and close the hollow layer from both sides in the axial direction, The second pipe material covers the first pipe material from the outside in the radial direction, and the first annular member is connected to the outer peripheral surface of the first pipe material and contacts the second pipe material, and the first annular member is connected to the outer peripheral surface of the first pipe material and contacts the second pipe material. is connected to the inner circumferential surface of the second pipe material and contacts the first pipe material, and the hollow layer is arranged to include the range of the locking part in the axial direction of the first pipe material. In addition, the hollow layer is characterized in that it extends toward the vertical tube from the locking portion, and a portion of the hollow layer overlaps the vertical tube .
According to this invention, an expansion joint is constructed by arranging a vertical pipe or the like having a foam layer within each axial end of the first pipe material. After that, when the vertical pipe etc. contracts in the axial direction from a predetermined length, the range between the end before the length of the vertical pipe etc. changes and the end after the change in the axial direction is determined. A hollow layer is arranged so as to contain the Generally, the insulation performance of the hollow layer is higher than that of the foam layer and the insulation performance of the pipe material, so even if the vertical pipe etc. shrinks and there is no foam layer inside the expansion joint, condensation will still form on the outside of the expansion joint. can be suppressed.
Moreover, a hollow layer can be formed by the second pipe material, the first annular member, and the second annular member.

Further, another expansion joint of the present invention includes: a first pipe member in which an end portion of a vertical pipe is disposed; a hollow portion in which a hollow layer covering the first pipe member from the inside in the radial direction is formed; a locking part fixed to the inner circumferential surface of the first pipe material, the first pipe material and the hollow part are each made of transparent resin, and the hollow layer is arranged in the axial direction of the first pipe material. The hollow layer is arranged closer to the vertical tube than the locking portion, extends toward the vertical tube from the locking portion, and a part of the hollow layer overlaps the vertical tube. There is.
According to this invention, an expansion joint is constructed by arranging a vertical pipe or the like having a foam layer within each axial end of the first pipe material. After that, when the vertical pipe etc. contracts in the axial direction from a predetermined length, the range between the end before the length of the vertical pipe etc. changes and the end after the change in the axial direction is determined. A hollow layer is arranged so as to contain the Generally, the insulation performance of the hollow layer is higher than that of the foam layer and the insulation performance of the pipe material, so even if the vertical pipe etc. shrinks and there is no foam layer inside the expansion joint, condensation will still form on the outside of the expansion joint. can be suppressed.
Further, the positions of the vertical pipes and the like disposed within the first pipe can be visually confirmed from outside the expansion joint by passing through the first pipe and the hollow portion.

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

Further, in the above expansion joint, the second pipe material covers the first pipe material from the inside in the radial direction, and the first annular member and the second annular member are respectively connected to the outer peripheral surface of the second pipe material. and may contact the first tube member, respectively.
According to this invention, a hollow layer can be formed by the first tube material and the hollow portion in which the second tube material, the first annular member, and the second annular member are connected.

Further, in the above expansion joint, the hollow part has a pair of divided bodies that cover the first pipe material from the outside in the radial direction, and each of the divided bodies has a space between the first pipe material and the hollow part. a tubular piece obtained by circumferentially dividing a second tubular material on which a layer is formed; a first annular member piece formed in a semicircular shape and extending radially inward from a first end of the tubular piece; a second annular member piece formed in a semicircular ring shape and extending radially inward from the second end of the tubular piece, and the hollow layer includes a pair of the tubular pieces and the first tubular member. may be formed between.
Further, in the above expansion joint, each of the divided bodies includes a first flange protruding from the radially inner end of the first annular member piece toward a side opposite to the second annular member piece. , a second flange protruding from the radially inner end of the second annular member piece toward a side opposite to the first annular member piece, and each of the divided bodies is integrally formed with resin. , and each of the divided bodies may be fixed to the first tube member.

According to the expansion joint of the present invention, even if the vertical pipe or the like disposed inside contracts, it is possible to suppress dew condensation on the outer surface.

1 is a longitudinal cross-sectional view of a piping system in which an expansion joint according to a first embodiment of the present invention is used. 2 is an enlarged view of part A in FIG. 1. FIG. It is a longitudinal cross-sectional view of the piping system in which the expansion joint of the modification of the 1st embodiment of the present invention is used. It is a longitudinal cross-sectional view of the piping system in which the expansion joint of the modification of the 1st embodiment of the present invention is used. FIG. 2 is a longitudinal sectional view of a piping system in which an expansion joint according to a second embodiment of the present invention is used. FIG. 3 is a longitudinal cross-sectional view of a piping system in which an expansion joint according to a third embodiment of the present invention is used. FIG. 7 is a longitudinal cross-sectional view of a piping system in which an expansion joint according to a fourth embodiment of the present invention is used. It is a perspective view of the expansion joint of a 5th embodiment of the present invention. It is a longitudinal cross-sectional view of the same expansion joint.

(First embodiment)
Hereinafter, a piping system in which a first embodiment of an expansion joint according to the present invention is used will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, a piping system 1 is used in a building 11, for example. 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 this embodiment, a first vertical pipe (vertical pipe) 61, and a second vertical pipe (vertical pipe) 66. Below, first, the vertical pipes 61 and 66 will be explained.

The first vertical pipe 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 into 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 thermoplastic resin composition for a foam layer containing a resin including a vinyl chloride resin and a foaming agent.
Note that the configuration of the first vertical tube 61 is not limited to this, and the first vertical tube may be configured by providing a heat insulating material on the outer peripheral surface of the vertical tube 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 in the same manner as the non-foamed inner layer 62, foamed layer 63, and non-foamed outer layer 64 of the first vertical pipe 61.

The expansion joint 21 includes a tube body 26, a first cap 41, and a second cap 51.
The tube body 26 includes a first tube material 27, a first annular member 28, a second tube material 29, a locking portion 30, and a holding portion 31. The first tube material 27 is formed into a circular tube shape. The first tube material 27 is arranged such that the axial direction of the first tube material 27 is along the vertical direction Z. In addition, the arrangement|positioning of the 1st pipe material 27 is not limited to this, You may arrange|position the 1st pipe material 27 so that the axial direction of the 1st pipe material 27 may intersect with the up-down direction Z.

The inner diameter of the first tube member 27 is constant regardless of its position in the vertical direction Z. The inner diameter of the first tube material 27 and the outer diameter of the vertical tubes 61 and 66 are approximately the same.
On the other hand, as shown in FIGS. 1 and 2, the outer diameter of the first tube material 27 is larger at the upper end (on the other axial side) Z2 than at the lower end (on the other axial side) Z1. . As a result, a stepped portion 27a is formed on the outer circumferential surface of the first tube member 27 at an intermediate portion in the vertical direction Z. It is preferable that the step portion 27a is formed over the entire circumference of the first tube member 27.
Further, as shown in FIG. 1, a plurality of protrusions 27b are formed on the outer circumferential surface of the first tube material 27, above the step portion 27a in an upper direction Z2. . The plurality of protrusions 27b are arranged apart from each other in the vertical direction Z.

The distance between the plurality of protrusions 27b is such that the expansion joint 21 can be gripped by a support tool (indicated by a chain double-dashed line D in FIG. 1) having a gripping portion for fixing the expansion joint 21 to a wall surface. The gripping portion of the support D grips the outer surface of the first tube material 27 between the protrusions 27b, and the gripping portion contacts the side surface of the protrusion 27b to prevent the expansion joint 21 from following the expansion and contraction of the first vertical tube 61. Fixed.

The first annular member 28 is formed in an annular shape. The first annular member 28 is disposed coaxially with the first tube 27 in the vertical direction Z at a portion between the stepped portion 27a and the plurality of protrusions 27b on the outer circumferential surface of the first tube 27. The inner peripheral edge of the first annular member 28 is connected to the outer peripheral surface of the first tube member 27.
The second tube material 29 is formed into a circular tube shape. The second tube material 29 is arranged coaxially with the first tube material 27, and covers an intermediate portion of the first tube material 27 in the vertical direction Z from the outside in the radial direction. The second tube material 29 is spaced apart from the first tube material 27 toward the outside in the radial direction. The second tube member 29 extends from the radially outer end of the first annular member 28 toward the downward direction Z1. As shown in FIG. 2, the lower Z1 end of the second tube 29 is disposed above the step 27a of the first tube 27 Z2.
A first locking portion 29a is formed on the outer circumferential surface of the lower end of the second tube member 29 and projects toward the outside in the radial direction. It is preferable that the first locking portion 29a is formed over the entire circumference of the second tube material 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 tube 61 are approximately the same.
The locking portion 30 is disposed within the first tube 27 coaxially with the first tube 27 . The outer peripheral edge of the locking portion 30 is fixed to the inner peripheral surface of the first tube member 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 toward the downward direction Z1 as it approaches the axis of the first tube member 27.
As shown in FIG. 2, in the vertical direction Z, the lower surface of the locking portion 30 and the lower end Z1 of the second tube member 29 are aligned with each other.

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

A first sealing member 33 is held inside the upper end portion of the holding portion 31 in the radial direction. The first sealing member 33 is formed in an annular shape and is arranged coaxially with the holding part 31. In a natural state where 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 member 27. The first sealing member 33 is made of, for example, a resin that is softer than the tube body 26.
The first sealing member 33 is arranged above the first tube member 27 Z2.

The first cap 41 includes a second annular member 42 and a first peripheral wall portion 43.
The second annular member 42 is formed in an annular shape and is arranged coaxially with the first tube member 27 . The second annular member 42 is spaced apart from the first annular member 28 in the downward direction Z1. In a natural state where 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 its natural state is shown by a chain double-dashed line.
A recessed portion 42a recessed toward the upper direction Z2 is formed in the inner peripheral edge portion of the lower surface of the second annular member 42. The recess 42a opens radially inward. By forming the recess 42a in the second annular member 42, the inner peripheral edge of the second annular member 42 has a shorter length in the vertical direction Z than the portion of the second annular member 42 other than the inner peripheral edge ( A thin wall portion 42b (thin thickness) is formed. The thin portion 42b is more easily deformed in the vertical direction Z than the portions of the second annular member 42 other than the thin portion 42b. The thin portion 42b is formed on the upper surface of the inner peripheral edge of the second annular member 42. It is preferable that the thin portion 42b be 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 portion of the first tube member 27 below the step portion 27a are approximately the same. The outer diameter of the thin portion 42b is larger than the outer diameter of the upper end portion of the step portion 27a of the first tube member 27 in the upper direction Z2.

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. As shown in FIGS. The first peripheral wall portion 43 extends from the outer peripheral edge of the second annular member 42 toward the upper direction Z2. The inner diameter of the first peripheral wall portion 43 is larger than the outer diameter of the second tube member 29.
A first locked portion 43a that protrudes radially inward is formed on the inner peripheral surface of the upper end portion of the first peripheral wall portion 43. It is preferable that the first locked portion 43a is 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 tube member 29 are approximately the same.
The first cap 41 configured as described above is integrally formed of resin such as polypropylene (PP). Note that the first cap 41 may be formed of a resin such as polyethylene (PE), acrylonitrile-butadiene-styrene (ABS), or vinyl chloride.

The first cap 41 is fitted onto the lower end of the second tube member 29 of the tube body 26 .
More specifically, the second annular member 42 of the first cap 41 is in contact with the lower surface of the second tube member 29 from below Z1 of this lower surface. The thin portion 42b of the second annular member 42 contacts the step portion 27a of the first tube member 27 from below Z1 of the step portion 27a. Since the stepped portion 27a is disposed below the lower end of the second tube member 29, the inner circumferential edge side of the second annular member 42 is bent toward the downward direction Z1, and the elastic force of the second annular member 42 causes the stepped portion 27a to The thin wall portion 42b is in strong contact with the.
Therefore, the airtightness between the stepped portion 27a of the first tube member 27 and the thin portion 42b of the first cap 41 can be improved. Moreover, even if the shape of the first cap 41 is distorted, the stepped portion 27a and the thin portion 42b can be brought into contact with each other reliably. Since the thin portion 42b is more easily deformed than the portions of the second annular member 42 other than the thin portion 42b, the thin portion 42b can be easily deformed.

The first circumferential wall portion 43 of the first cap 41 is arranged coaxially with the second tube 29 and covers the second tube 29 from the outside in the radial direction. As shown in FIG. 2, the first locked portion 43a of the first peripheral wall portion 43 is locked to the first locking portion 29a of the second tube member 29 from above Z2 of the first locking portion 29a.
In this way, the first cap 41 is fitted onto the lower end of the second tube member 29.

As shown in FIG. 1, a hollow layer that covers the first tube material 27 from the outside in the radial direction is formed by the first annular member 28, the second tube material 29, and the second annular member 42 of the first cap 41, which constitute the tube body 26. A hollow portion 45 is formed in which S1 is formed. The hollow layer S1 is formed between the first pipe material 27 and the second pipe material 29. The annular members 28 and 42 close 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 tube material 27. The hollow layer S1 covers an intermediate portion of the first tube member 27 in the vertical direction Z.
Generally, the heat insulation performance of the hollow layer is higher than the heat insulation performance of the foam layer of piping formed of resin or metal, and the heat insulation performance of the pipe material.
The upper end of the hollow layer S1 extends up 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 S1 and the lower surface of the locking part 30 substantially coincide with each other.

As shown in FIG. 1, the second cap 51 includes a third annular member 52 and a second peripheral wall portion 53.
The third annular member 52 is formed in an annular shape and is arranged coaxially with the first tube member 27 . The inner diameter of the third annular member 52 and the outer diameter of the second vertical tube 66 are approximately the same.
The second peripheral wall portion 53 is formed in a cylindrical shape and is arranged 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 toward the downward direction 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 that protrudes radially inward is formed on the inner peripheral surface of the lower end portion 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 approximately the same.
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 onto the upper end of the holding portion 31 of the tube 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 Z2 of this upper surface.
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 Z1 of the second locking portion 31a.
In this way, the second cap 51 is fitted onto the upper end of the holding part 31.

An annular second sealing member 56 is disposed below the locking portion 30 in the first tube member 27 Z1. The inner diameter and outer diameter of the second sealing member 56 are approximately the same as the inner diameter and outer diameter of the first vertical tube 61, respectively. The second sealing member 56 is made 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 part 30 from the lower side Z1 of the locking part 30.
The first vertical tube 61 described above is arranged with its axis along the vertical direction Z. The upper end of the first vertical tube 61 is disposed within the lower end of the first tube 27 . The first vertical tube 61 is in contact with the second sealing member 56 from below Z1. By locking the first vertical tube 61 with the locking portion 30 via the second sealing member 56, movement of the first vertical tube 61 upward Z2 with respect to the tube body 26 is restricted. The second sealing member 56 provides a watertight seal between the locking portion 30 and the first vertical tube 61 .
In addition, 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 lower Z1 than the lower end of the second sealing member 56. Good too.
Further, the second sealing member 56 does not necessarily have to be provided on the expansion joint 21.

The second vertical tube 66 is arranged with its axis along the vertical direction Z. The lower end of the second vertical tube 66 is disposed within the upper end of the first tube 27 . When arranging the second vertical tube 66 inside the first sealing member 33, the first sealing member 33 is elastically deformed and the inner diameter of the first sealing member 33 becomes large. and the second vertical pipe 66 are watertightly sealed.
The lower end of the second vertical tube 66 is disposed at an intermediate portion 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 tube 66 and the upper end of the hollow layer S1 are separated by a distance L2 in the vertical direction Z.
The distance L1 is set so that even if the constructed second vertical pipe 66 extends in the vertical direction Z, the second vertical pipe 66 does not come into contact with the locking portion 30. On the other hand, the distance L2 is set so that even if the constructed second vertical pipe 66 contracts in the vertical direction Z, the lower end of the second vertical pipe 66 will not be placed above the upper end of the hollow layer S1 Z2. . In other words, in the vertical direction Z, the hollow layer S1 is arranged so as to include the range between the lower end before the length of the second vertical tube 66 changes and the lower end after the change.

In the piping system 1 constructed as described above, after 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 body 26. However, if the moving distance is less than the distance L2, there is a portion that overlaps the second vertical pipe 66 and the hollow layer S1 in the vertical direction Z. Therefore, even if cold drain water flows through the piping system 1, the heat of the drain water is less likely to be transferred to the outer surface of the expansion joint 21, and dew condensation is less likely to occur on the outer surface of the expansion joint 21.
On the other hand, even if the second vertical pipe 66 extends in the vertical direction Z after construction and moves downward Z1 with respect to the pipe main body 26, even if the moving distance is less than the distance L1. For example, the second vertical tube 66 does not come into contact with the locking portion 30 of the tube body 26. Therefore, stress is suppressed from being applied to the second vertical tube 66 due to the second vertical tube 66 coming into contact with the locking portion 30 .

As explained above, according to the expansion joint 21 of this embodiment, the vertical pipes 61 and 66 are arranged within each end of the first pipe material 27 in the vertical direction Z. At that time, when the second vertical tube 66 contracts from a predetermined length in the vertical direction Z, the lower end of the second vertical tube 66 before the length changes and the lower end after the change in the vertical direction Z. The hollow layer S1 is arranged so as to include the range between . Generally, 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 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 if it runs out, dew condensation on the outer surface of the expansion joint 21 can be suppressed.
Since the hollow part 45 includes the first annular member 28, the second pipe material 29, and the second annular member 42, the first annular member 28, the second pipe material 29, and the second annular member 42 form the hollow layer S1. be able to.

Note that the first pipe material 27 and the hollow portion 45 that constitute the expansion joint 21 may each be transparent. Transparent here includes colorless transparent and colored transparent. In this case, the expansion joint 21 can be made of acrylic resin, polycarbonate resin, or the like.
By configuring the expansion joint 21 of this modified example, the positions of the vertical pipes 61 and 66 arranged in the first pipe material 27 can be transmitted from the outside of the expansion joint 21 through the first pipe material 27 and the hollow part 45, respectively. and can be visually recognized.
Note that the first cap 41, the locking portion 30, etc. 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 in place of the first cap 41 of the expansion joint 21 of this embodiment. Note that in this modification, the second tube member 29 does not have the first locking portion 29a.
The first cap 76 includes a second annular member 77 , a first peripheral wall portion 78 , and a third peripheral wall portion 79 .
The second annular member 77 is formed in an annular shape like the second annular member 42, and is arranged coaxially with the first tube member 27. The outer diameter of the second annular member 77 and the outer diameter of the second tube member 29 are approximately the same. The inner peripheral edge of the second annular member 77 is in contact with the step 27a of the first tube 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 the inner peripheral edge of the upper surface of the second annular member 77 . The inner diameter of the first peripheral wall portion 78 and the outer diameter of the portion of the first tube member 27 above the step portion 27a at Z2 are approximately the same. The first circumferential wall portion 78 is in contact with the outer circumferential surface of the first tube member 27 above the step portion 27a Z2.
The third peripheral wall portion 79 is fixed to a radially intermediate portion of 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 tube member 29 are approximately the same. The outer circumferential surface of the third circumferential wall portion 79 is in contact with the inner circumferential surface of the second tube member 29 .
The first cap 76 is made of the same material as the first cap 41.

The tube materials 27, 29 and the first cap 76 are fixed to each other by a connecting portion (not shown) formed with a known adhesive or adhesive material. The first annular member 28, the second pipe material 29, and the second annular member 77 of the first cap 76 forming the pipe body 26 form a hollow layer S2 that covers the first pipe material 27 from the outside in the radial direction. A hollow portion 81 is configured.

The modified expansion joint 21A configured in this manner can also provide the same effects as the expansion joint 21 of this embodiment.
Furthermore, by connecting the tube materials 27, 29 and the first cap 76 at the connecting portion, the airtightness between the tube materials 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 foamed material (second annular member) 86 may be provided instead of the first cap 76 of the expansion joint 21A of the modification.
In this modification, a stepped portion 29b is formed on the inner peripheral surface of the second tube member 29. The inner diameter of the portion of the second tube material 29 that is below the step portion 29b at Z1 is larger than the inner diameter of the portion of the second tube material 29 that is above the step portion 29b and Z2. This stepped portion 29b and the stepped portion 27a of the first tube member 27 are at 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 member 27 . The foam material 86 is made of a foamable material that does not have air permeability, such as foamed polyethylene or 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 engaged with the step portions 27a, 29b from the lower side Z1 of the step portions 27a, 29b. The lower surface of the foam material 86 and the lower end surface of the second tube member 29 are flush with each other.
The tube materials 27, 29 and the foam material 86 are fixed to each other by the aforementioned connecting portion (not shown).

The first annular member 28, the second tube material 29, and the foamed material 86 that constitute the tube body 26 constitute a hollow portion 88 in which a hollow layer S3 that covers the first tube material 27 from the outside in the radial direction is formed. .
The modified expansion joint 21B configured in this manner can also provide the same effects as the expansion joint 21 of this embodiment.

(Second embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. 5. Parts that are the same as those in the previous embodiment are given the same reference numerals, and their explanation will be omitted, and only different points will be explained.
As shown in FIG. 5, the expansion joint 91 of this embodiment used in the piping system 2 includes a first pipe main body 96, a second pipe main body 106, and a second cap 51.

The first tube body 96 includes a first tube 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 tube member 27 . The first annular member 98 extends from a middle portion of the outer circumferential surface of the first tube member 27 in the vertical direction Z toward the outside in the radial direction. 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 tube member 27 . The first spacer 99 extends from the radially intermediate portion of the upper surface of the first annular member 98 toward the upper direction Z2. A gap is formed in the radial direction between the first spacer 99 and the first tube member 27.

The second tube body 106 includes a second tube material 107, a second annular member 108, and a holding portion 109.
The second tube material 107 is formed in a cylindrical shape and is arranged coaxially with the first tube material 27. The second tube material 107 covers the first tube material 27 from the outside in the radial direction. The inner diameter of the second tube material 107 and the outer diameter of the first spacer 99 are approximately the same. The outer diameter of the second tube member 107 and the outer diameter of the first annular member 98 are approximately the same. A first spacer 99 is fitted into the second tube 107 , and the lower end of the second tube 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 tube member 107. The second annular member 108 extends radially inward from the inner circumferential surface at the upper end of the second tube member 107 . The second annular member 108 is connected to the upper end of the second tube 107. The inner diameter of the second annular member 108 and the inner diameter of the first tube member 27 are approximately the same. The lower surface of the second annular member 108 is in contact with the upper end of the first tube 27 from above Z2. The second annular member 108 is arranged so as to be spaced apart from the first annular member 98 in an upward direction Z2.

The first tube body 96 and the second tube body 106 are fixed to each other by the aforementioned connecting portion (not shown).
The first annular member 98 constituting the first tube body 96 and the second tube material 107 and second annular member 108 constituting the second tube body 106 form a hollow layer S5 that covers the first tube material 27 from the outside in the radial direction. A hollow portion 111 is formed inside.
The second pipe material 107, the first annular member 98, and the second annular member 108 surround the hollow layer S5 together with the first pipe material 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 part 109. A second locking portion 109a configured similarly to the second locking portion 31a of the holding portion 31 is formed on the outer peripheral surface of the holding portion 109.
The second cap 51 is fitted onto the upper end of the holding portion 109 of the second tube body 106.

As explained above, according to the expansion joint 91 of this embodiment, even if the vertical tubes 61 and 66 arranged inside contract, it is possible to suppress dew condensation on the outer surface.
Furthermore, a hollow layer S5 is formed by the first tube body 96 in which the first tube material 27 and the first annular member 98 are connected, and the second tube body 106 in which the second tube material 107 and the second annular member 108 are connected. be able to.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. 6. Parts that are the same as those in the previous embodiment are given the same reference numerals, explanations thereof will be omitted, and only different points will be explained.
As shown in FIG. 6, the expansion joint 116 of this embodiment used in the piping system 3 includes a pipe body 121, a hollow portion 131, and a second cap 51.

The tube body 121 includes a first tube material 122, a third annular member 123, and a third tube material 124.
The first tube material 122 is formed into a circular tube shape. The first tube material 122 is arranged such that the axial direction of the first tube material 122 is along the vertical direction Z. Note that the direction in which the first tube material 122 is arranged is not limited to this.
A second locking portion 122a configured similarly to the second locking portion 31a of the holding portion 31 is formed on the outer peripheral surface of the upper end portion of the first tube member 122.
The third annular member 123 is formed in an annular shape and is arranged coaxially with the first tube member 122. The third annular member 123 projects from the lower end of the first tube member 122 toward the inside in the radial direction.
The third tube member 124 is formed into a circular tube shape and is arranged coaxially with the third annular member 123. The third tube member 124 extends from the inner circumferential edge of the third annular member 123 toward the downward direction Z1. The inner diameter of the third tube material 124 and the outer diameter of the first vertical tube 61 are approximately the same.

The hollow portion 131 includes a second pipe member 132, a first annular member 133, and a second annular member 134.
The second tube material 132 is formed into a circular tube shape and is arranged coaxially with the first tube material 122. The second tube material 132 covers the first tube material 122 from the inside in the radial direction. The inner diameter of the second tube material 132 and the outer diameter of the second vertical tube 66 are approximately the same.
The first annular member 133 is formed in an annular shape and is arranged coaxially with the second tube member 132. The first annular member 133 protrudes radially outward from the outer circumferential surface of the lower end portion of the second tube member 132. The first annular member 133 is connected to the second pipe member 132. The first annular member 133 contacts the inner peripheral surface of the first tube member 122 from the inside in the radial direction.
The second annular member 134 is formed in an annular shape and is arranged coaxially with the second tube member 132. The second annular member 134 protrudes radially outward from the outer peripheral surface of the upper end of the second tube member 132. The second annular member 134 is connected to the second tube 132. The second annular member 134 is arranged so as to be spaced apart from the first annular member 133 in an upward direction Z2. The second annular member 134 contacts the inner circumferential surface of the first tube 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 body 121 in the lower direction Z1.

A cross-sectional shape of the hollow portion 131 including the axis of the first tube member 122 is formed in a C-shape with an open radial outer side.
The second tube material 132, the first annular member 133, and the second annular member 134 that constitute the hollow portion 131 form a hollow layer S7 inside that covers the first tube material 122 from the inside in the radial direction.
The tube body 121 and the hollow part 131 may be fixed to each other by the above-mentioned connection part, or may not be fixed to each other.

The first sealing member 33 is held inside the first tube member 122 in the radial direction and above the hollow portion 131 Z2.
The second cap 51 is fitted onto the upper end of the first tube member 122 of the tube body 121.

As explained above, according to the expansion joint 116 of this embodiment, even if the vertical pipes 61 and 66 arranged inside contract, it is possible to suppress dew condensation on the outer surface.
Furthermore, the hollow layer S7 can be formed by the first tube material 122 of the tube body 121, and the hollow portion 131 in which the second tube material 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. Parts that are the same as those in the previous embodiment are given the same reference numerals, and their explanation will be omitted, and only the different points will be explained.
As shown in FIG. 7, this piping system 4 includes vertical pipes 61 and 66, an expansion joint 141 of this embodiment, and a drain trap 151.

The expansion joint 141 is configured in the expansion joint 21 of the first embodiment such that the lower Z1 end of the second pipe member 29 extends to the vicinity of the lower Z1 end of the first pipe member 27. The hollow layer S1 extends below the locking portion 30 to a position Z1.
An upper end of a connecting pipe (vertical pipe) 146 is disposed within the lower end of the first pipe member 27 of the expansion joint 141 . The connecting pipe 146 is a resin drain pipe without a foam layer.

The structure of the drain trap 151 is not particularly limited as long as it can prevent backflow of drain water. For example, the drain trap 151 includes a trap body 152, a lid portion 153, a trap portion 154, a reduced diameter portion 155, and an upper receptacle 156. In addition, the trap unit 157 is comprised by the lid part 153, the trap part 154, and the connection member 159 mentioned later.
The upper socket 156, the reduced diameter part 155, and the trap main body 152 are arranged in this order from the upper Z2 toward the lower Z1.

The trap body 152 is formed in a cylindrical shape extending along the vertical direction Z. An opening 152a that penetrates the trap body 152 in the radial direction is formed in the side surface of the trap body 152.
The lid portion 153 is formed in a cylindrical shape with a bottom. The lid portion 153 is disposed such that the bottom wall portion faces inward in the radial direction, and is fitted into the opening 152a of the trap body 152.
The lid portion 153 is removably 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 arranged within the trap body 152 so as to be spaced apart from the inner peripheral surface of the trap body 152. The trap portion 154 is a funnel-shaped receiving container made 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 inner diameter of the reduced diameter portion 155 gradually increase toward the upper direction Z2.
The upper socket 156 is provided at the upper end of the reduced diameter portion 155 . The upper receptacle 156 is formed in a cylindrical shape and extends from the outer edge of the reduced diameter portion 155 toward the upper direction Z2. The upper socket 156 includes a foamed resin layer 156a inside.
The inner diameter of the upper socket 156 and the outer diameter of the connecting pipe 146 are equal to each other. A lower end portion of the connecting tube 146 is disposed within the upper receptacle 156 .

A lower receptacle 160 is provided at the lower end of the trap body 152. The inner diameter of the lower socket 160 and the outer diameter of the first vertical tube 61 are approximately the same. The upper end portion of the first vertical tube 61 is disposed within the lower socket 160 with a third sealing member 161 interposed therebetween. Note that the drain trap 151 does not need to include the third sealing member 161.
In this example, a region where the upper socket 156 of the drain trap 151 and the connecting pipe 146 overlap in the vertical direction Z is insulated by the foamed resin layer 156a of the upper socket 156.
In the drain trap 151 configured in this way, the trap unit 157 can be attached to and detached from the trap body 152.

The expansion joint 141 of this embodiment described above can also prevent dew condensation on the outer surface even if the second vertical pipe 66 and the connecting pipe 146 arranged inside contract.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. 8 and 9. Parts that are the same as those in the previous embodiment are given the same reference numerals, and their explanation will be omitted, and only the different points will be omitted. explain.
As shown in FIGS. 8 and 9, the expansion joint 171 of this embodiment includes a first pipe member 27, a hollow portion 176, and a second cap 51.
The hollow portion 176 is a cover that covers the first tube member 27 from the outside in the radial direction, and is formed in a circular tube shape as a whole. The hollow portion 176 is constituted by a pair of divided bodies 177 that are formed by dividing the hollow portion 176 into two along a plane that includes the central axis of the hollow portion 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 tube member 27 from the outside in the radial direction. The pair of tubular pieces 178 constitute a second tube member 178A. That is, the pair of tubular pieces 178 are configured by dividing the second tubular member 178A in the circumferential direction.
The first annular member piece 179 is formed in a semicircular 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 that protrudes upward Z2 is formed at the radially inner end of the first annular member piece 179.
The second annular member piece 180 is formed in a semicircular shape. The second annular member piece 180 extends radially inward from the lower end of the tubular piece 178. The pair of second annular member pieces 180 constitute a second annular member 180A.
A flange 184 that protrudes downward Z1 is formed at the radially inner end of the second annular member piece 180.

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

The expansion joint 171 of the present embodiment described above can also prevent dew condensation on the outer surface even if the vertical pipe disposed inside contracts.

As mentioned above, the first to fifth embodiments of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and the configuration is within the scope of the gist of the present invention. This also includes changes, combinations, deletions, etc. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations.
For example, in the first to fifth embodiments, the first pipe material and the second pipe material 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 material, and the part of the expansion joint radially outer than the hollow layer may be the second pipe material.

The expansion joint does not need to include the locking part 30, the first sealing member 33, and the second cap 51.
Although the pipes connected by the expansion joint are a pair of vertical pipes, they may also be a pair of horizontal pipes.

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

Claims (6)

a first tube member in which the end of the vertical tube is disposed;
a hollow portion in which a hollow layer is formed to cover the first pipe material from the outside or the inside in the radial direction;
a locking portion fixed to the inner circumferential surface of the first pipe material;
Equipped with
The hollow part is
a second tube material that covers the first tube material from the outside or inside in the radial direction and has the hollow layer formed between it and the first tube material;
a first annular member and a second annular member that are provided apart from each other in the axial direction of the first tube material and close the hollow layer from both sides in the axial direction;
has
The second pipe material covers the first pipe material from the outside in the radial direction,
The first annular member is connected to an outer circumferential surface of the first tube and contacts the second tube,
The second annular member is connected to an inner circumferential surface of the second pipe material and contacts the first pipe material,
The hollow layer is arranged so as to include the locking portion in the axial direction of the first tube member, and extends toward the vertical tube side from the locking portion to cover one of the hollow layers. An expansion joint in which a portion overlaps the vertical pipe. a first tube member in which the end of the vertical tube is disposed;
a hollow portion in which a hollow layer is formed to cover the first pipe material from the inside in the radial direction;
a locking portion fixed to the inner circumferential surface of the first pipe material;
Equipped with
The first pipe material and the hollow part are each made of transparent resin,
The hollow layer is disposed closer to the vertical tube than the locking portion in the axial direction of the first tube material, extends toward the vertical tube from the locking portion, and An expansion joint that partially overlaps the vertical pipe. The hollow part is
a second tube material that covers the first tube material from the outside or inside in the radial direction and has the hollow layer formed between it and the first tube material;
a first annular member and a second annular member that are provided apart from each other in the axial direction of the first tube material and close the hollow layer from both sides in the axial direction;
The expansion joint according to claim 2, having: The second pipe material covers the first pipe material from the inside in the radial direction,
The expansion joint according to claim 3, wherein the first annular member and the second annular member are each connected to an outer circumferential surface of the second pipe material and contact the first pipe material, respectively. The hollow part has a pair of divided bodies that cover the first tube member from the outside in the radial direction,
Each of the divided bodies is
a tubular piece obtained by dividing a second pipe material in the circumferential direction between which the hollow layer is formed between the second pipe material and the first pipe material;
a first annular member piece formed in a semicircular ring shape and extending toward the inside in the radial direction from the first end of the tubular piece;
a second annular member piece formed in a semicircular shape and extending toward the inside in the radial direction from the second end of the tubular piece;
Equipped with
The expansion joint according to claim 2, wherein the hollow layer is formed between the pair of tubular pieces and the first tube material. Each of the divided bodies is
a first flange protruding from the radially inner end of the first annular member piece toward a side opposite to the second annular member piece;
a second flange protruding from the radially inner end of the second annular member piece toward a side opposite to the first annular member piece;
Equipped with
Each of the divided bodies is integrally formed of resin,
The expansion joint according to claim 5, wherein each of the divided bodies is fixed to the first pipe member.

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