Eccentric joints, piping systems

Abstract

To provide an eccentric joint and a piping system that allows for improved strength. [Solution] The eccentric joint (4) has a first pipe section (41) with a first end (41a) and a second end (41b) in the direction of the first pipe axis (C41), and has a first insertion port (410) at the first end (41a), and a second pipe section (41) with a second pipe axis (C42) parallel to the first pipe axis (C41), and has a third end (42a) on the opposite side of the first pipe section (41) in the direction of the second pipe axis (C42) and a fourth end (42b) on the first pipe section (41) side, and has a second insertion port (420) at the third end (42a). and a third pipe portion 43 having a third pipe axis C43 intersecting the first pipe axis C41 and the second pipe axis C42 and connecting the second end 41b of the first pipe portion 41 to the fourth end 42b of the second pipe portion 42, and fillets 44 (44-1, 44-2, 44-3, 44-4) are provided between an outer circumferential surface 431 of the third pipe portion 43 and at least one of an outer circumferential surface 411 of the first pipe portion 41 and an outer circumferential surface 421 of the second pipe portion 42.

Description

[Technical Field]

[0001] The present disclosure relates to eccentric couplings and piping systems. [Background technology]

[0002] Various gutter systems (piping systems) have been provided in the past (see, for example, Patent Document 1). A gutter system includes an eaves gutter that receives rainwater from the roof of a building, and a downspout that directs rainwater from the eaves gutter outlet to a manhole on the ground. In a gutter system, the central axis of the eaves gutter outlet and the downspout may be misaligned due to construction constraints such as the shape of the building. A so-called S-socket (S-shaped socket) has been provided as a component for connecting piping components such as an eaves gutter and a downspout that have misaligned central axes. The S-socket has an S-shape from the first socket to the second socket, and the first socket and the second socket open in opposite directions to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2024-93975 Summary of the Invention [Problem to be solved by the invention]

[0004] Such an S-socket can connect an eaves gutter and a downspout that are not aligned with each other, but the stress on the eaves gutter and the downspout tends to concentrate in the S-socket, which can be one of the causes of damage to the S-socket (eccentric joint).

[0005] The present disclosure provides eccentric joints and piping systems that allow for increased strength. [Means for solving the problem]

[0006] An eccentric joint according to one embodiment of the present disclosure comprises a first pipe section having a first pipe axis, a first end and a second end in the direction of the first pipe axis, and a first insertion port at the first end; a second pipe section having a second pipe axis parallel to the first pipe axis, a third end opposite the first pipe section in the direction of the second pipe axis, and a fourth end on the first pipe section side, and having a second insertion port at the third end; and a third pipe section connecting the second end of the first pipe section and the fourth end of the second pipe section, wherein a fillet is present between the outer peripheral surface of the third pipe section and at least one of the outer peripheral surfaces of the first pipe section and the second pipe section.

[0007] A piping system according to one aspect of the present disclosure includes the above-described eccentric joint, a first piping member connected to the first socket, and a second piping member connected to the second socket. [Effects of the Invention]

[0008] Aspects of the present disclosure allow for improved strength. [Brief explanation of the drawings]

[0009] [Figure 1] Schematic diagram of a piping system according to one embodiment. [Figure 2] 1 is a cross-sectional view of a portion including an eccentric joint in a piping system according to an embodiment; [Figure 3] FIG. 1 is a perspective view of an eccentric joint of a piping system according to an embodiment, seen from above; [Figure 4] 1 is a perspective view of an eccentric joint of a piping system according to an embodiment, viewed from below; FIG. [Figure 5] View from the V direction of Figure 3 [Figure 6] View from the VI direction of Figure 3 [Figure 7] View from direction VII in Figure 5 [Figure 8] View from direction VIII in Figure 5 [Figure 9] View from the IX direction in Figure 5 [Figure 10] View from the X direction of Figure 5 [Figure 11] Cross section of line AA in Figure 5 [Figure 12]Cross section of line BB in Figure 5 [Figure 13] Cross section of line CC in Figure 5 [Figure 14] Cross section of line DD in Figure 9 [Figure 15] FIG. 10 is a diagram showing the results of a fluid simulation of the eccentric coupling according to the embodiment and a conventional example. [Figure 16] Cross-sectional view of an eccentric joint according to Modification 1 [Figure 17] Cross-sectional view of an eccentric joint according to Modification 2 [Figure 18] Cross-sectional view of an eccentric joint according to Modification 3 [Figure 19] Schematic diagram of a piping system according to Modification 4 DETAILED DESCRIPTION OF THE INVENTION

[0010] [1. Embodiment] Hereinafter, embodiments of the present disclosure will be described, occasionally with reference to the drawings. However, the following embodiments are merely examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following content (e.g., the shape, dimensions, and arrangement of each component). Positional relationships, such as up, down, left, and right, are based on the positional relationships shown in the drawings, unless otherwise specified. Each figure described in the following embodiments is a schematic diagram, and the ratios of the size and thickness of each component in each figure do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0011] In the following description, when it is necessary to distinguish between multiple components, prefixes such as "first" and "second" are added to the names of the components. However, when the components can be distinguished from each other by the symbols attached to them, the prefixes such as "first" and "second" may be omitted in consideration of readability of the text.

[0012] In the following description, when it is necessary to distinguish between multiple components, suffixes such as "-1" and "-2" are added to the symbols of the components. However, when it is not necessary to distinguish between multiple components, the suffixes "-1" and "-2" may be omitted to improve readability.

[0013] [1.1 Configuration] FIG. 1 is a schematic diagram of a piping system 1 according to an embodiment.

[0014] The piping system 1 is a piping system for transporting fluids with a Reynolds number of 4000 or greater. Fluids with a Reynolds number of 4000 or greater are considered to be turbulent fluids that flow inside a cylinder. Examples of fluids include liquids (drinking water, heat source water, wastewater, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flow (a mixture of liquid and gas). The piping system 1 constitutes a gutter system that collects rainwater from the roof 21 of a building 20 and channels it into a manhole 31 on the ground 30. The rainwater collected in the manhole 31 flows from the manhole 31 through an underground pipe 32 and into a storm sewer. The building 20 may be, for example, a non-residential facility such as a store, office, factory, building, school, welfare facility, or hospital, or a residential facility such as a detached house, an apartment building, or each dwelling unit of a detached house or apartment building. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping malls, stations, and airports.

[0015] The piping system 1 includes an eaves gutter 2, vertical pipes 3 (3-1, 3-2), an eccentric joint 4, and a drain 5.

[0016] The eaves gutter 2 receives rainwater from the roof 21 of the building 20. The eaves gutter 2 is installed under the roof 21 of the building 20. As an example, the eaves gutter 2 is arranged at the eaves edge of the roof 21. In particular, the eaves gutter 2 is arranged so as to extend along the eaves edge of the roof 21. The eaves gutter 2 is shaped like a long bucket. The eaves gutter 2 has a bottom wall 2a. An inlet 2b is formed in the bottom wall 2a. The inlet 2b is, for example, a circular opening. In a rain gutter system, the inlet 2b is also referred to as a water collection inlet, a drain outlet, or a drop outlet. As an example, the eaves gutter 2 may be formed by extrusion molding of a resin material. The eaves gutter 2 may include a core material to reinforce the strength of the entire eaves gutter 2. The core material may be made of, for example, metal. As another example, the eaves gutter 2 may be formed from a metal plate, for example, a steel plate (also called a coil).

[0017] The drain 5 is disposed at the inlet 2b of the eaves gutter 2. The drain 5 is used to reduce the generation of vortices and the entrainment of air at the inlet 2b. The drain 5 may have a known configuration.

[0018] The standpipe 3 defines a vertical flow path. The standpipe 3 is fixed to the wall 22 of the building 20. In a gutter system, the standpipe 3 is also called a downspout. The standpipe 3 is installed to drain rainwater from the inlet 2b. The standpipe 3 allows the rainwater from the inlet 2b to flow vertically. The standpipe 3 is straight. The cross section perpendicular to the central axis of the standpipe 3 is circular. The standpipe 3 is arranged so that the direction of the central axis of the standpipe 3 coincides with the up-down direction (vertical direction). The standpipe 3 has an upstream end 3a and a downstream end 3b. The piping system 1 uses two standpipes 3-1 and 3-2. The standpipe 3-1 is connected to the eaves gutter 10 via the drain 5, and the standpipe 3-2 is connected to the manhole 31. Due to the positional relationship between the eaves gutter 10 and the manifold 31, the central axes of the standpipes 3-1 and 3-2 do not coincide but are offset. The upstream end 3a of the standpipe 3-1 is the end connected to the inlet 2b of the standpipe 3 (the upper end in FIG. 1). The downstream end 3b of the standpipe 3-2 is the end inserted into the manifold 31 (the lower end in FIG. 1). In FIG. 1, a pipe cover 3c is arranged to prevent rainwater from flowing into the manifold 31 through a gap between the standpipe 3-2 and the manifold 31. It is preferable that the length of at least one of the standpipes 3-1 and 3-2 is 3 m or more. In this embodiment, the standpipe 3-1 is longer than the standpipe 3-2, and the length of the standpipe 3-1 is 3 m or more.

[0019] As an example, the material of the standpipe 3 is rigid polyvinyl chloride. The dimensions of the standpipe 3, such as the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipes."

[0020] FIG. 2 is a cross-sectional view of a portion of the piping system 1 including the eccentric joint 4. As shown in FIG.

[0021] 1 and 2, the eccentric joint 4 has a first socket 4a and a second socket 4b. In the piping system 1, the downstream end 3b of the standpipe 3-1 is connected to the first socket 4a of the eccentric joint 4, and the upstream end 3a of the standpipe 3-2 is connected to the second socket 4b of the eccentric joint 4. In this way, the eccentric joint 4 connects the standpipes 3-1 and 3-2, thereby forming a flow path for rainwater from the eaves gutter 2 to the manhole 31.

[0022] The piping system 1 described above can drain rainwater from the eaves gutter 2 into the manhole 31 through the standpipe 3. In the piping system 1, the central axis of the standpipe 3-1 is misaligned with the central axis of the standpipe 3-2, and the eccentric joint 4 is employed to absorb this misalignment of the central axes. Therefore, due to this misalignment of the central axes of the standpipes 3-1 and 3-2, stress acting on the standpipes 3-1 and 3-2 may be concentrated at the eccentric joint 4. In this embodiment, in order to reduce the possibility of the eccentric joint 4 being damaged due to such stress concentration, the eccentric joint 4 has a structure with improved strength.

[0023] The eccentric joint 4 will be described in further detail below with reference to Figures 3 to 14. Figure 3 is a perspective view of the eccentric joint 4 as seen from above, and Figure 4 is a perspective view of the eccentric joint 4 as seen from below. Figures 5 and 6 are views as seen from directions V and VI in Figure 3, respectively. Figures 7, 8, 9, and 10 are views as seen from directions VII, VIII, IX, and X in Figure 5, respectively. Figures 11, 12, 13, and 14 are cross-sectional views taken along lines AA, BB, CC, and DD in Figure 5, respectively.

[0024] As can be seen from FIGS. 3 and 4, the eccentric joint 4 includes a first pipe portion 41, a second pipe portion 42, and a third pipe portion 43.

[0025] The first pipe portion 41 is the portion on the upstream side of the eccentric joint 4 .

[0026] The first pipe section 41 has a straight pipe shape. As shown in FIGS. 3, 4, 9, and 11, the first pipe section 41 has a first pipe axis C41. The first pipe section 41 has a first end 41a and a second end 41b in the direction of the first pipe axis C41. In this embodiment, the first end 41a is the upstream end, and the second end 41b is the downstream end. The first end 41a is perpendicular to the first pipe axis C41, and the second end 41b intersects with the first pipe axis C41. In particular, the angle θ1 of the second end 41b with respect to the first pipe axis C41 is less than 90°, and in this embodiment, θ1 is 67.5°. As shown in FIG. 11, the first pipe section 41 has an outer circumferential surface 411 and an inner circumferential surface 412. As can be seen from FIGS. 3 to 5, the cross section of the first pipe section 41 perpendicular to the first pipe axis C41 is circular. The outer diameter of the first tubular portion 41 is constant in the direction of the first tubular axis C41 of the first tubular portion 41.

[0027] 3, 4, 5, 11, and 12, the first pipe portion 41 has a first insertion port 410 at a first end 41a. The first pipe portion 41 forms a first socket 4a to which a first piping member (in this embodiment, a standpipe 3-1) is connected. The inner diameter of the first insertion port 410 is larger than the outer diameter of the first piping member connected to the first insertion port 410.

[0028] The second pipe portion 42 is the portion on the downstream side of the eccentric joint 4 .

[0029] The second pipe section 42 has a straight pipe shape. As shown in FIGS. 3, 4, 9, and 11, the second pipe section 42 has a second pipe axis C42. In this embodiment, the second pipe axis C42 is parallel to the first pipe axis C41. The second pipe section 42 has a third end 42a and a fourth end 42b in the direction of the second pipe axis C42. In this embodiment, the third end 42a is the downstream end, and the fourth end 42b is the upstream end. Therefore, the third end 42a is on the opposite side to the first pipe section 41 in the direction of the second pipe axis, and the fourth end 42b is on the first pipe section 41 side in the direction of the second pipe axis. In this embodiment, the third end 42a is perpendicular to the second pipe axis C42, and the fourth end 42b intersects with the second pipe axis C42. In particular, the angle θ2 of the fourth end 42b with respect to the second tube axis C42 is less than 90°, and in this embodiment, θ2 is 67.5°. As shown in Fig. 11, the second tubular portion 42 has an outer peripheral surface 421 and an inner peripheral surface 422. As can be seen from Figs. 3, 4, and 6, the cross section of the second tubular portion 42 perpendicular to the second tube axis C42 is circular. The outer diameter of the second tubular portion 42 is constant in the direction of the second tube axis C42 of the second tubular portion 42.

[0030] As shown in Figures 3, 4, 6, 11, and 12, the second pipe section 42 has a second insertion port 420 at a third end 42a. The second pipe section 42 forms a second socket 4b to which a second piping member (in this embodiment, the upright pipe 3-2) is connected. The inner diameter of the second insertion port 420 is larger than the outer diameter of the second piping member connected to the second insertion port 420. In this embodiment, the inner diameters of the first insertion port 410 and the second insertion port 420 are set to accommodate piping members of the same outer diameter.

[0031] The sizes (particularly, outer diameter, thickness, inner diameter, etc.) of the first pipe portion 41 and the second pipe portion 42 may be set appropriately according to the size of the piping member to be connected to the eccentric joint 4. The nominal diameter may be the nominal diameter in the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid polyvinyl chloride pipes."

[0032] Table 1 shows an example of the nominal diameter of VP rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 1, the units for the outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0033] [Table 1]

[0034] Table 2 shows an example of the nominal diameter of VU rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 2, the units of outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0035] [Table 2]

[0036] As an example, the outer diameters of the first pipe section 41 and the second pipe section 42 may be 60 mm to 140 mm (i.e., VU50 to VU125). In this embodiment, the outer diameter of the second pipe section 42 is equal to the outer diameter of the first pipe section 41. The pipe diameter sizes of the first pipe section 41 and the second pipe section 42 may be the nominal diameters described above, or may be sizes set by manufacturers selling piping, etc., and examples include 60 mm, 76 mm, 89 mm, 114 mm, and 140 mm.

[0037] The third pipe portion 43 is located between the first pipe portion 41 and the second pipe portion 42 and connects the first pipe portion 41 and the second pipe portion 42. More specifically, the third pipe portion 43 connects the second end 41b of the first pipe portion 41 and the fourth end 42b of the second pipe portion 42.

[0038] The third tube section 43 has a straight tube shape. As shown in Figs. 3, 4, 9, and 11, the third tube section 43 has a third tube axis C43. The third tube axis C43 intersects with the first tube axis C41 and the second tube axis C42. As shown in Fig. 9, the angle θ of the third tube axis C43 with respect to the first tube axis C41 and the second tube axis C42 is preferably 40° or more and 60° or less. In this embodiment, the angle θ is 45°.

[0039] In this embodiment, the first insertion port 410 and the second insertion port 420 partially overlap in a plane perpendicular to the first pipe axis C41 and the second pipe axis C42. This enables improvement in the drainage performance of the eccentric joint 4.

[0040] In this embodiment, the first pipe portion 41 and the second pipe portion 42 have the same inner diameter. As shown in Fig. 11, if the distance (eccentric distance) between the first pipe axis C41 and the second pipe axis C42 is D and the inner diameters of the first pipe portion 41 and the second pipe portion 42 are d, then d / 3 < D < d / 2 is satisfied. This enables the drainage performance of the eccentric joint 4 to be improved.

[0041] As shown in FIG. 11, the third pipe portion 43 has an outer circumferential surface 431 and an inner circumferential surface 432.

[0042] The inner circumferential surface 432 extends linearly along the third tube axis C43 in a plane including the first tube axis C41, the second tube axis C42, and the third tube axis C43. This can reduce the possibility of turbulence occurring within the third pipe portion 43. This point will be described later with reference to FIG. 15.

[0043] The inner circumferential surface 432 is not a simple circle when viewed from the direction of the third tube axis C43. As shown in FIGS. 5 and 6, in this embodiment, the inner circumferential surface 432 includes a first inner circumferential surface 432a that is a portion on the first pipe portion 41 side and a second inner circumferential surface 432b that is a portion on the second pipe portion 42 side. As shown in FIG. 5, in this embodiment, the first inner circumferential surface 432a surrounds the first insertion port 410 over a range greater than 180° around the first pipe axis C41 when viewed from the direction of the first pipe axis C41. As shown in FIG. 6, the second inner circumferential surface 432b surrounds the first insertion port 410 over a range greater than 180° around the first pipe axis C41 when viewed from the direction of the first pipe axis C41. However, the first inner circumferential surface 432a surrounds the first insertion port 410 within an area less than 360° around the first tube axis C41 when viewed from the direction of the first tube axis C41, and the second inner circumferential surface 432b surrounds the second insertion port 420 within an area less than 360° around the second tube axis C42 when viewed from the direction of the second tube axis C42. As a result, the inner circumferential shape of the third pipe section 43 is a shape like two circles of the same diameter partially overlapping each other.

[0044] The outer peripheral surface 431 is not a simple circle when viewed from the direction of the third pipe axis C43. As shown in FIGS. 3, 4, 7 to 10, and 14, the outer peripheral surface 431 has a shape that conforms to the first inner peripheral surface 432a and the second inner peripheral surface 432b so that the thickness of the third pipe portion 43 falls within a predetermined range. More specifically, the outer peripheral surface 431 includes a first outer peripheral surface 431a that faces the first pipe portion 41, a second outer peripheral surface 431b that faces the second pipe portion 42, and concave third and fourth outer peripheral surfaces 431c and 431d that are located between the first outer peripheral surface 431a and the second outer peripheral surface 431b. This maintains the thickness of the third pipe portion 43 within a predetermined range. Therefore, when the eccentric joint 4 is formed of resin, the possibility of sink marks occurring on the outer peripheral surface 431 of the third pipe portion 43 can be reduced.

[0045] 9, in the eccentric joint 4, in a plane including the first pipe axis C41 of the first pipe portion 41, the second pipe axis C42 of the second pipe portion 42, and the third pipe axis C43 of the third pipe portion 43, the outer circumferential surface 411 of the first pipe portion 41 extends linearly along the first pipe axis C41, the outer circumferential surface 421 of the second pipe portion 42 extends linearly along the second pipe axis C42, and the outer circumferential surface 431 of the third pipe portion 43 extends linearly along the third pipe axis C43. This allows for improved design.

[0046] In this embodiment, fillets 44 (44-1 to 44-4) are provided between an outer circumferential surface 431 of the third pipe portion 43 and at least one of an outer circumferential surface 411 of the first pipe portion 41 and an outer circumferential surface 421 of the second pipe portion .

[0047] In particular, in this embodiment, the fillets 44 include first fillets 44-1 and 44-2 and second fillets 44-3 and 44-4.

[0048] The first fillets 44-1 and 44-2 are located between the outer peripheral surface 411 of the first pipe portion 41 and the outer peripheral surface 431 of the third pipe portion 43. In this embodiment, the first fillets 44-1 and 44-2 are located only partially, but not entirely, between the outer peripheral surface 411 of the first pipe portion 41 and the outer peripheral surface 431 of the third pipe portion 43. As shown in FIGS. 9 and 10 , the first fillets 44-1 and 44-2 are located between the outer peripheral surface 411 of the first pipe portion 41 and the first outer peripheral surface 431a of the third pipe portion 43, and between the outer peripheral surface 411 of the first pipe portion 41 and the second outer peripheral surface 431b of the third pipe portion 43, respectively. The first fillet 44-1 is an outer peripheral fillet, and the angle between the connecting surfaces exceeds 180°. The first fillet 44-2 is an inner peripheral fillet, and the angle between the connecting surfaces is less than 180°. In this embodiment, the surface of the first fillet 44-1, which is an outer circumferential fillet, is convex, and the surface of the first fillet 44-2, which is an inner circumferential fillet, is concave. As can be seen from Figures 7 to 9, the widths of the first fillets 44-1 and 44-2 become narrower as they approach the first tube axis C41 or the third tube axis C43 in a plane including the first tube axis C41, the second tube axis C42, and the third tube axis C43.

[0049] The second fillets 44-3 and 44-4 are located between the outer peripheral surface 421 of the second pipe portion 42 and the outer peripheral surface 431 of the third pipe portion 43. In this embodiment, the second fillets 44-3 and 44-4 are located partially, but not entirely, between the outer peripheral surface 421 of the second pipe portion 42 and the outer peripheral surface 431 of the third pipe portion 43. As shown in FIGS. 9 and 10 , the second fillets 44-3 and 44-4 are located between the outer peripheral surface 421 of the second pipe portion 42 and the second outer peripheral surface 431b of the third pipe portion 43, and between the outer peripheral surface 421 of the second pipe portion 42 and the first outer peripheral surface 431a of the third pipe portion 43, respectively. The second fillet 44-3 is an outer peripheral fillet, and the angle between the connecting surfaces exceeds 180°. The second fillet 44-4 is an inner peripheral fillet, and the angle between the connecting surfaces is less than 180°. In this embodiment, the surface of the second fillet 44-3, which is an outer circumferential fillet, is convex, and the surface of the second fillet 44-4, which is an inner circumferential fillet, is concave. As can be seen from Figures 7 to 9, the widths of the second fillets 44-3 and 44-4 become narrower toward the second tube axis C42 or the third tube axis C43 in a plane including the first tube axis C41, the second tube axis C42, and the third tube axis C43.

[0050] In the eccentric joint 4, a fillet 44 is provided between the outer circumferential surface 411 of the first pipe portion 41 or the outer circumferential surface 421 of the second pipe portion 42 and the outer circumferential surface 431 of the third pipe portion 43. The presence of the fillet 44 can mitigate stress concentration at the boundary between the first pipe portion 41 or the second pipe portion 42 and the third pipe portion 43, compared to when the fillet 44 is not present. This makes it possible to improve the strength of the eccentric joint 4.

[0051] In the piping system 1, when the upright pipes 3-1 and 3-2 expand or contract due to heat, the position of the upright pipe 3-2 relative to the upright pipe 3-1 shifts in the vertical direction, and stress is likely to be applied in the vertical direction (the direction of the first pipe axis C41 or the second pipe axis C42) between the first pipe section 41 and the second pipe section 42 of the eccentric joint 4. Therefore, the fillet 44 includes an outer peripheral fillet (fillets 44-1 and 44-3) and an inner peripheral fillet (fillets 44-2 and 44-4). This improves strength against stress in the direction of the first pipe axis C41 or the second pipe axis C42. As a result, the possibility of damage to the eccentric joint 4 can be further reduced.

[0052] In this embodiment, the radius of curvature of the surface of each fillet 44 is preferably 3 mm or more. This can further alleviate stress concentration at the boundary between the first tubular portion 41 or the second tubular portion 42 and the third tubular portion 43, and further ensure the thickness of the fillet 44, thereby improving the strength of the fillet 44 itself. The radius of curvature of the surface of each fillet 44 is preferably 10 mm or less. If the radius of curvature of the fillet 44 exceeds 10 mm, uneven thickness of the fillet 44 may make it difficult to distribute stress. In addition, the reflection of light on the surface of the fillet 44 is reduced, thereby reducing glare and improving design. Note that in this embodiment, the radius of curvature of the surface of the fillet 44 is defined as the radius of curvature of the fillet 44 in a plane including the first tube axis C41, the second tube axis C42, and the third tube axis C43.

[0053] 11 and 12, the inner diameter of the first pipe portion 41 is not constant in the direction of the first pipe axis C41 of the first pipe portion 41. The inner circumferential surface 412 of the first pipe portion 41 includes a sloped portion 412a between the first insertion port 410 and the third pipe portion 43 in the first pipe portion 41. The sloped portion 412a decreases the inner diameter of the first pipe portion 41 from the first insertion port 410 toward the third pipe portion 43 in the direction of the first pipe axis C41. The sloped portion 412a comes into contact with the piping member (upright pipe 3-1) inserted into the first pipe portion 41 from the first insertion port 410, stabilizing the connection of the piping member to the first pipe portion 41. This improves the stability of the connection to the first insertion port 410. Here, it is preferable that the inner diameter of the first pipe section 41 at the inclined portion 412a is larger than the inner diameter of the piping member (upright pipe 3-1) inserted into the first pipe section 41 from the first insertion port 410. This makes it possible to ignore the effect of the inclined portion 412a on the flow path of the piping member inserted into the first pipe section 41 from the first insertion port 410.

[0054] 11 and 13, the eccentric joint 4 further includes an inner cylindrical portion 45 and connecting portions 46 and 47. The inner cylindrical portion 45 and the connecting portions 46 and 47 are formed integrally and continuously with at least one of the second pipe portion 42 and the third pipe portion 43.

[0055] As shown in FIGS. 4, 6, 11, and 13, the inner cylindrical portion 45 has a straight pipe shape. The inner cylindrical portion 45 has an outer peripheral surface 451 and an inner peripheral surface 452. As shown in FIG. 6, a cross section of the inner cylindrical portion 45 perpendicular to the central axis C45 is circular. The outer diameter and inner diameter of the inner cylindrical portion 45 are substantially constant in the direction of the central axis C45 of the inner cylindrical portion 45. The inner cylindrical portion 45 has a first end 45a and a second end 45b. The first end 45a is the end of the inner cylindrical portion 45 on the second insertion port 420 side (the downstream end). The second end 45b is the end of the inner cylindrical portion 45 opposite the second insertion port 420 (the upstream end). The thickness of the inner cylindrical portion 45 is smaller than the thickness of the second pipe portion 42. This can prevent the inner cylindrical portion 45 from reducing the cross-sectional area of ​​the flow path, thereby reducing the effect of the inner cylindrical portion 45 on the flow path.

[0056] The inner cylindrical portion 45 is disposed within the second pipe portion 42 so that the central axis C45 of the inner cylindrical portion 45 coincides with the second pipe axis C42 of the second pipe portion 42. The length of the inner cylindrical portion 45 is set so that the end (first end 45a) of the inner cylindrical portion 45 on the second insertion port 420 side is closer to the third pipe portion 43 than the second insertion port 420. In other words, the inner cylindrical portion 45 does not extend beyond the second insertion port 420. This makes it possible to reduce the extent to which the cross-sectional area of ​​the flow path is reduced by the inner cylindrical portion 45, and to reduce the effect of the inner cylindrical portion 45 on the flow path.

[0057] An annular gap G exists between the inner circumferential surface 422 of the second pipe portion 42 and the outer circumferential surface 451 of the inner cylindrical portion 45. As shown in FIG. 2 , an end portion of a piping member (the upstream end portion 3a of the standpipe 3-2) connected to the second pipe portion 42 is inserted into the gap G. That is, the gap G is formed between the inner circumferential surface 422 of the second pipe portion 42 and the inner cylindrical portion 45, allowing the end portion of the piping member (the upstream end portion 3a of the standpipe 3-2) connected to the second pipe portion 42 to fit therein. Therefore, the second pipe portion 42 and the inner cylindrical portion 45 can stabilize the connection state of the piping member (the standpipe 3-2) inserted into the second pipe portion 42 from the second insertion port 420. This improves the stability of the connection to the second insertion port 420.

[0058] As shown in FIGS. 11 and 13, the connecting portions 46, 47 connect the inner cylindrical portion 45 to at least one of the second pipe portion 42 and the third pipe portion 43.

[0059] The connecting portion 46 connects a portion 45c of the inner cylindrical portion 45 on the first pipe portion 41 side to the first inner circumferential surface 432a of the third pipe portion 43. In the present embodiment, the connecting portion 46 protrudes from the first inner circumferential surface 432a toward the second pipe axis C42 in a direction perpendicular to the second pipe axis C42, and is connected to the second end 45b of the inner cylindrical portion 45 at the portion 45c.

[0060] The connecting portion 47 connects a portion 45d of the inner cylindrical portion 45 opposite the first pipe portion 41 side to the second inner circumferential surface 432b of the third pipe portion 43. In the present embodiment, the connecting portion 47 protrudes from the second inner circumferential surface 432b toward the second insertion port 420 along the second pipe axis C42, and is connected to the second end 45b of the inner cylindrical portion 45 at the portion 45d.

[0061] The connecting portions 46, 47 connect the entire circumference of the end (second end 45b) of the inner cylindrical portion 45 opposite the second insertion port 420 to the inner circumferential surface 422, 432 of at least one of the second pipe portion 42 and the third pipe portion 43. As a result, the connecting portions 46, 47 cooperate to enclose a gap G between the outer circumferential surface 451 of the inner cylindrical portion 45 and the inner circumferential surface 422 of the second pipe portion 42, as viewed from the direction of the second pipe axis C42 of the second pipe portion 42. Note that the space enclosed by the connecting portions 46, 47 is connected to the interior of the third pipe portion 43, and the fluid that flows in from the first insertion port 410 of the first pipe portion 41 passes through the first pipe portion 41, the third pipe portion 43, the connecting portions 46, 47, and the inner cylindrical portion 45, and is discharged from the second pipe portion 42 of the second pipe portion 42 to the outside.

[0062] In the eccentric joint 4, because fluid is discharged from the second insertion port 420, rainwater or the like may enter the gap between the second pipe section 42 and the piping member (the upright pipe 3-2) and accumulate therein. If the water accumulated in the gap freezes, it may cause damage to the eccentric joint 4 or the piping member. Furthermore, water accumulated in the gap may increase the risk of water leakage due to poor adhesion between the eccentric joint 4 and the piping member. However, the eccentric joint 4 includes the inner cylindrical section 45 and the connecting sections 46 and 47, which can cover the gap between the inner circumferential surface 422 of the second pipe section 42 and the piping member inserted into the second pipe section 42 from the second insertion port 420. This reduces the possibility of rainwater or the like entering the gap between the second pipe section 42 and the piping member and accumulating therein.

[0063] As described above, the eccentric joint 4 enables improved strength. Furthermore, in the eccentric joint 4, the inner circumferential surface 432 of the third pipe section 43 extends linearly along the third pipe axis C43 in a plane including the first pipe axis C41, the second pipe axis C42, and the third pipe axis C43. This reduces the possibility of turbulence occurring within the third pipe section 43. To confirm this, the drainage performance of the eccentric joint 4 was evaluated using a fluid simulation. In evaluating the drainage performance of the eccentric joint 4, an existing S-shaped socket (S-shaped socket described in the PVC Pipe and Fittings Association, Standard No. 64, Drainage Rigid Polyvinyl Chloride Pipe Fittings) was used for comparison.

[0064] FIG. 15 shows the results of a fluid simulation of the eccentric joint 4 of this embodiment and the S-shaped socket of a conventional example. Focusing on the portion indicated by P1 in FIG. 15, it was confirmed that the eccentric joint 4 of this embodiment suppresses the generation of turbulence compared to the conventional example. That is, in the eccentric joint 4, the inner circumferential surface 432 of the third pipe portion 43 extends linearly along the third pipe axis C43 in a plane including the first pipe axis C41, the second pipe axis C42, and the third pipe axis C43. This is considered to reduce the generation of turbulence, unlike the conventional example in which the inner circumferential surface 432 is concave. As such, the eccentric joint 4 of this embodiment can improve drainage performance compared to the conventional example.

[0065] [1.2 Effects, etc.] The eccentric joint 4 described above has a first pipe axis C41, a first end 41a and a second end 41b in the direction of the first pipe axis C41, and a first insertion port 410 at the first end 41a. The eccentric joint 4 has a second pipe axis C42 parallel to the first pipe axis C41, a third end 42a on the opposite side of the first pipe section 41 in the direction of the second pipe axis C42, and a fourth end 42b on the first pipe section side. The third end 42a has a second insertion port 420. The optical fiber cable includes a second tubular portion 42 and a third tubular portion 43 having a third tubular axis C43 intersecting the first tubular axis C41 and the second tubular axis C42 and connecting the second end 41b of the first tubular portion 41 to the fourth end 42b of the second tubular portion 42, and fillets 44 (44-1, 44-2, 44-3, 44-4) are provided between an outer circumferential surface 431 of the third tubular portion 43 and at least one of the outer circumferential surface 411 of the first tubular portion 41 and the outer circumferential surface 421 of the second tubular portion 42. This configuration improves strength.

[0066] In the eccentric joint 4, the fillets 44 include first fillets 44-1 and 44-2 between the outer circumferential surface 411 of the first pipe portion 41 and the outer circumferential surface 431 of the third pipe portion 43, and second fillets 44-3 and 44-4 between the outer circumferential surface 421 of the second pipe portion 42 and the outer circumferential surface 431 of the third pipe portion 43. This configuration enables further improvement in strength.

[0067] In the eccentric joint 4, the fillet 44 is composed of outer peripheral fillets 44-1 and 44-3 and inner peripheral fillets 44-2 and 44-4, and the surfaces of the outer peripheral fillets 44-1 and 44-3 are convex, while the surfaces of the inner peripheral fillets 44-2 and 44-4 are concave. This configuration enables further improvement in strength.

[0068] In the eccentric joint 4, the radius of curvature of the surface of the fillet 44 is 3 mm or more and 10 mm or less. This configuration enables further improvement in strength. It also reduces light reflection on the surface of the fillet 44, enabling reduced glare and improved design.

[0069] In the eccentric joint 4, the first insertion port 410 and the second insertion port 420 partially overlap in a plane perpendicular to the first pipe axis C41 and the second pipe axis C42. This configuration enables the drainage performance of the eccentric joint 4 to be improved.

[0070] In the eccentric joint 4, the first pipe section 41 and the second pipe section 42 have the same inner diameter, and satisfy the relationship d / 3≦D≦d / 2, where D is the distance between the first pipe axis C41 and the second pipe axis C42, and d is the inner diameter of the first pipe section 41 and the second pipe section 42. This enables the drainage performance of the eccentric joint 4 to be improved.

[0071] In the eccentric joint 4, the inner circumferential surface 432 of the third pipe portion 43 includes a first inner circumferential surface 432a that surrounds the first insertion port 410 over an angle greater than 180° around the first pipe axis C41 when viewed from the direction of the first pipe axis C41, and a second inner circumferential surface 432b that surrounds the second insertion port 420 over an angle greater than 180° around the second pipe axis C42 when viewed from the direction of the second pipe axis C42, and the outer circumferential surface 431 of the third pipe portion 43 has a shape that follows each of the first inner circumferential surface 432a and the second inner circumferential surface 432b so that the thickness of the third pipe portion 43 is within a predetermined range. This configuration can reduce the possibility of sink marks occurring on the outer circumferential surface 431 of the third pipe portion 43.

[0072] In the eccentric joint 4, the angle of the third pipe axis C43 of the third pipe portion 43 with respect to the direction perpendicular to the first pipe axis C41 and the second pipe axis C42 is equal to or greater than 40° and less than 90°. This configuration enables the drainage performance of the eccentric joint 4 to be improved.

[0073] In the eccentric joint 4, in a plane including the first pipe axis C41, the second pipe axis C42, and the third pipe axis C43, the inner circumferential surface 432 of the third pipe portion 43 extends linearly along the third pipe axis C43 of the third pipe portion 43. This configuration enables the drainage performance of the eccentric joint 4 to be improved.

[0074] In the eccentric joint 4, in a plane including the first pipe axis C41, the second pipe axis C42, and the third pipe axis C43, the outer circumferential surface 431 of the third pipe portion 43 extends linearly along the third pipe axis C43 of the third pipe portion 43. This configuration enables improvement in design.

[0075] The eccentric joint 4 includes an inner cylindrical portion 45 located within the second pipe portion 42 and having a central axis C45 coinciding with the second pipe axis C42, and connection portions 46, 47 that connect the entire circumference of the end (second end 45b) of the inner cylindrical portion 45 opposite the second insertion port 420 to the inner circumferential surface 422, 432 of at least one of the second pipe portion 42 and the third pipe portion 43, and a gap G is formed between the inner circumferential surface 422 of the second pipe portion 42 and the outer circumferential surface 451 of the inner cylindrical portion 45 to accommodate the end (upstream end 3a of the standpipe 3-2) of the piping member connected to the second insertion port 420. This configuration improves the stability of the connection to the second insertion port 420.

[0076] In the eccentric joint 4, the end (first end 45a) of the inner cylindrical portion 45 on the second insertion port 420 side is located closer to the third pipe portion 43 than the second insertion port 420. This configuration can reduce the influence of the inner cylindrical portion 45 on the flow path.

[0077] In the eccentric joint 4, the thickness of the inner cylindrical portion 45 is smaller than the thickness of the second pipe portion 42. This configuration can reduce the influence of the inner cylindrical portion 45 on the flow path.

[0078] In the eccentric joint 4, the inner circumferential surface 412 of the first pipe portion 41 includes a sloped portion 411a where the inner diameter of the first pipe portion 41 decreases from the first insertion port 410 toward the third pipe portion 43 in the direction of the first pipe axis C41. This configuration enables improved stability of connection to the first insertion port 410.

[0079] The piping system 1 described above includes the eccentric joint 4, a first piping member (standby pipe 3-1) connected to the first insertion port 410, and a second piping member (standby pipe 3-2) connected to the second insertion port 420. This configuration enables improvement in strength.

[0080] [2. Modifications] The embodiments of the present disclosure are not limited to the above-described embodiments. The above-described embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiments are listed below. The modifications described below can be applied in appropriate combinations.

[0081] [2.1 Variation 1] 16 is a cross-sectional view of an eccentric joint 4A according to Modification 1. The eccentric joint 4A has a connection portion 46A that is different from the connection portion 46 of the eccentric joint 4.

[0082] The connecting portion 46A connects a portion 45c of the inner cylindrical portion 45 on the first pipe portion 41 side to the first inner circumferential surface 432a of the third pipe portion 43. The connecting portion 46A protrudes from the first inner circumferential surface 432a toward the second pipe axis C42 along the first inner circumferential surface 432a and is connected to the second end 45b of the inner cylindrical portion 45 at the portion 45c. In other words, the connecting portion 46A has a shape such that the first inner circumferential surface 432a is extended toward the second pipe axis C42. The connecting portion 46A can promote the flow of fluid along the first inner circumferential surface 432a, contributing to improved drainage performance.

[0083] [2.2 Variation 2] 17 is a cross-sectional view of an eccentric joint 4B according to Modification 2. The eccentric joint 4B includes a connection portion 47B that is different from the connection portion 47 of the eccentric joint 4.

[0084] The connecting portion 47B connects a portion 45d of the inner cylindrical portion 45 opposite the first pipe portion 41 side to an inner circumferential surface 422 of the second pipe portion 42. The connecting portion 47B protrudes from the inner circumferential surface 422 toward the second pipe axis C42 in a direction perpendicular to the second pipe axis C42, and is connected to the second end 45b of the inner cylindrical portion 45 at the portion 45d. Compared to the connecting portion 47, the connecting portion 47B can increase the volume of fluid flowing in the eccentric joint 4A.

[0085] [2.3 Variation 3] 18 is a cross-sectional view of an eccentric joint 4C according to Modification 3. The eccentric joint 4C has a connection portion 46A different from the connection portion 46 of the eccentric joint 4, and also has a connection portion 47A different from the connection portion 47 of the eccentric joint 4.

[0086] [2.4 Variation 4] 19 is a schematic diagram of a piping system 1D according to Modification 4. The piping system 1D includes an eaves gutter 2, a standpipe 3, an eccentric joint 4, and a drain 5.

[0087] Unlike the piping system 1, the piping system 1D has one standpipe 3. The upstream end 3a of the standpipe 3 is not directly connected to the drain 5, but is connected to the drain 5 via an eccentric joint 4. On the other hand, the downstream end 3b of the standpipe 3 is inserted into a manifold 31.

[0088] In the piping system 1D, the eccentric joint 4 is located between the drain 5 and the standpipe 3. The drain 5 as the first piping member is connected to the first socket 4a of the eccentric joint 4, and the upstream end 3a of the standpipe 3 as the second piping member is connected to the second socket 4b of the eccentric joint 4. In this way, the eccentric joint 4 connects the drain 5 and the standpipe 3, thereby forming a flow path for rainwater from the eaves gutter 2 to the manhole 31.

[0089] In the piping system 1D, the central axis of the inlet 2b of the eaves gutter 2 (which is equal to the central axis of the drain 5) is misaligned with the central axis of the vertical pipe 3, and an eccentric joint 4 is used to absorb this misalignment of the central axis.

[0090] The piping system 1D described above includes the eccentric joint 4, a first piping member (drain 5) connected to the first insertion port 410, and a second piping member (standby pipe 3) connected to the second insertion port 420. This configuration enables improvement in strength.

[0091] In the piping system 1D, eccentric joints 4A, 4B, and 4C may be used instead of the eccentric joint 4.

[0092] [2.5 Other Modifications] In one variation, the eccentric joint 4 may be formed by injection molding of a resin such as hard vinyl chloride resin, polycarbonate, or ABS, or may be made of a metal such as cast iron.

[0093] In one modified example, the position of the eccentric joint 4 is not particularly limited. The eccentric joint 4 can be disposed at any position in the piping system 1. Therefore, the first piping member and the second piping member are not limited to the upright pipe 3 or the drain 5, and can be any piping member used in the piping system 1.

[0094] In one variant, the eccentric joint 4 does not necessarily have to have the inclined portion 412a.

[0095] In one modified example, when viewed from the direction of the first tube axis C41 of the first tube portion 41, the outer shape of the first tube portion 41 is not limited to a circular shape, but may be an elliptical shape, a polygonal shape, or another shape. When viewed from the direction of the second tube axis C42 of the second tube portion 42, the outer shape of the second tube portion 42 is not limited to a circular shape, but may be an elliptical shape, a polygonal shape, or another shape. When viewed from the direction of the third tube axis C43 of the third tube portion 43, the outer shape of the third tube portion 43 may be a circular shape, or may be an elliptical shape, a polygonal shape, or another shape.

[0096] In one modification, the second end 41b of the first tubular section 41 may be perpendicular to the first tube axis C41. The fourth end 42b of the second tubular section 42 may be perpendicular to the second tube axis C42. The angles θ1 and θ2 are not necessarily the same and may be different. The second end 41b of the first tubular section 41 may be perpendicular to the third tube axis C43. The fourth end 42b of the second tubular section 42 may be perpendicular to the third tube axis C43.

[0097] [3. Aspects] As is apparent from the above-described embodiment and modifications, the present disclosure includes the following aspects.

[0098] [Aspect 1] a first pipe portion having a first pipe axis, a first end and a second end in the direction of the first pipe axis, and a first insertion port at the first end; a second pipe portion having a second pipe axis parallel to the first pipe axis, a third end opposite to the first pipe portion in the direction of the second pipe axis, and a fourth end on the first pipe portion side, the second pipe portion having a second insertion port at the third end; a third tube portion having a third tube axis intersecting the first tube axis and the second tube axis, the third tube portion connecting the second end of the first tube portion and the fourth end of the second tube portion; Equipped with A fillet is present between the outer circumferential surface of the third pipe portion and at least one of the outer circumferential surface of the first pipe portion and the outer circumferential surface of the second pipe portion. Eccentric coupling.

[0099] [Aspect 2] The fillet is a first fillet between an outer circumferential surface of the first tubular portion and an outer circumferential surface of the third tubular portion; a second fillet between an outer circumferential surface of the second tubular portion and an outer circumferential surface of the third tubular portion; Including, 1. Eccentric coupling of embodiment 1.

[0100] [Aspect 3] The fillet is composed of an outer circumferential fillet and an inner circumferential fillet, the surface of the outer circumferential fillet is convex, The surface of the inner circumferential fillet is concave. 3. The eccentric coupling of embodiment 1 or 2.

[0101] [Aspect 4] The radius of curvature of the surface of the fillet is 3 mm or more and 10 mm or less. The eccentric joint according to any one of aspects 1 to 3.

[0102] [Aspect 5] The first insertion port and the second insertion port partially overlap in a plane perpendicular to the first tube axis and the second tube axis. The eccentric joint according to any one of aspects 1 to 4.

[0103] [Aspect 6] The first pipe portion and the second pipe portion have the same inner diameter, The distance between the first tube axis and the second tube axis is D, When the inner diameter of the first pipe portion and the second pipe portion is d, d / 3≦D≦d / 2 is satisfied. 5. Eccentric joint of embodiment 5.

[0104] [Aspect 7] The inner circumferential surface of the third pipe portion is a first inner circumferential surface that surrounds the first insertion port around the first tube axis in a range greater than 180° when viewed from the direction of the first tube axis; a second inner circumferential surface that surrounds the second insertion port around the second tube axis in a range greater than 180° when viewed from the direction of the second tube axis; and an outer peripheral surface of the third pipe portion has a shape that follows the first inner peripheral surface and the second inner peripheral surface so that the wall thickness of the third pipe portion is within a predetermined range; 7. The eccentric coupling of embodiment 5 or 6.

[0105] [Aspect 8] the angle of the third tube axis with respect to a direction perpendicular to the first tube axis and the second tube axis is equal to or greater than 40° and less than 90°; The eccentric joint according to any one of aspects 1 to 7.

[0106] [Aspect 9] In a plane including the first tube axis, the second tube axis, and the third tube axis, an inner circumferential surface of the third tube portion extends linearly along the third tube axis. The eccentric coupling according to any one of aspects 1 to 8.

[0107] [Aspect 10] In a plane including the first tube axis, the second tube axis, and the third tube axis, the outer circumferential surface of the third tube portion extends linearly along the third tube axis. The eccentric joint according to any one of aspects 1 to 9.

[0108] [Aspect 11] an inner cylindrical portion located within the second tubular portion and having a central axis coinciding with the second tubular axis; a connecting portion that connects the entire circumference of the end of the inner cylindrical portion opposite to the second insertion port to an inner circumferential surface of at least one of the second pipe portion and the third pipe portion; Equipped with A gap is formed between the inner peripheral surface of the second pipe portion and the outer peripheral surface of the inner cylindrical portion, into which an end of a piping member to be connected to the second insertion port is accommodated. The eccentric coupling according to any one of aspects 1 to 10.

[0109] [Aspect 12] The end of the inner cylindrical portion on the second insertion port side is located closer to the third pipe portion than the second insertion port. 12. The eccentric coupling of embodiment 11.

[0110] [Aspect 13] The wall thickness of the inner tube portion is smaller than the wall thickness of the second tube portion. 13. The eccentric coupling of embodiment 11 or 12.

[0111] [Aspect 14] an inner circumferential surface of the first pipe portion including an inclined portion in which an inner diameter of the first pipe portion decreases from the first insertion port toward the third pipe portion in the direction of the first pipe axis; The eccentric coupling according to any one of aspects 1 to 13.

[0112] [Aspect 15] An eccentric joint according to any one of aspects 1 to 14; a first piping member connected to the first insertion port; a second piping member connected to the second insertion port; Equipped with Piping system.

[0113] Aspects 2 to 14 are optional elements and are not essential. [Industrial Applicability]

[0114] The present disclosure is applicable to an eccentric joint and a piping system. Specifically, the present disclosure is applicable to an eccentric joint for connecting piping members whose central axes are offset, and a piping system including the eccentric joint. [Explanation of symbols]

[0115] 1. 1D Piping System 3. Vertical pipe (second piping component) 3-1 Vertical pipe (first piping component) 3-2 Vertical pipe (second piping component) 3a Upstream end 4, 4A, 4B, 4C eccentric fitting 4a First socket 4b Second underbite 41 First Pipe Section 41a 1st end 41b 2nd end 410 First Outlet 411 Outer surface 412 Inner surface 412a Slope 42 Second Pipe Section 42a 3rd end 42b 4th end 420 Second Outlet 421 Outer surface 422 Inner surface 43 Third Pipe Section 431 Outer surface 431a 1st outer surface 431b Second outer surface 432 Inner surface 432a 1st inner surface 432b 2nd inner surface 44 Fillet 44-1, 44-2 First fillet 44-3, 44-4 Second fillet 45 Inner cylinder 45a 1st end 45b 2nd end 46, 46A connection 47, 47B connection C41 1st tube shaft C42 2nd tube shaft C43 3rd tube shaft C45 center axis G Gap 5 Drain (first piping component)

Claims

1. a first pipe portion having a first pipe axis, a first end and a second end in the direction of the first pipe axis, and a first insertion port at the first end; a second pipe portion having a second pipe axis parallel to the first pipe axis, a third end opposite to the first pipe portion in the direction of the second pipe axis, and a fourth end on the first pipe portion side, the second pipe portion having a second insertion port at the third end; a third tube portion having a third tube axis intersecting the first tube axis and the second tube axis, the third tube portion connecting the second end of the first tube portion and the fourth end of the second tube portion; Equipped with a fillet is present between an outer circumferential surface of the third pipe portion and at least one of an outer circumferential surface of the first pipe portion and an outer circumferential surface of the second pipe portion; Eccentric coupling.

2. The fillet is a first fillet between an outer circumferential surface of the first tubular portion and an outer circumferential surface of the third tubular portion; a second fillet between an outer circumferential surface of the second tubular portion and an outer circumferential surface of the third tubular portion; Including, The eccentric coupling of claim 1.

3. The fillet is composed of an outer circumferential fillet and an inner circumferential fillet, the surface of the outer circumferential fillet is convex, The surface of the inner circumferential fillet is concave. The eccentric coupling of claim 1.

4. The radius of curvature of the surface of the fillet is 3 mm or more and 10 mm or less. The eccentric coupling of claim 1.

5. The first insertion port and the second insertion port partially overlap each other in a plane perpendicular to the first tube axis and the second tube axis. The eccentric coupling of claim 1.

6. The first pipe portion and the second pipe portion have the same inner diameter, The distance between the first tube axis and the second tube axis is D, When the inner diameter of the first pipe portion and the second pipe portion is d, d / 3≦D≦d / 2 is satisfied; The eccentric coupling of claim 5.

7. The inner circumferential surface of the third pipe portion is a first inner circumferential surface that surrounds the first insertion port around the first tube axis in a range greater than 180° when viewed from the direction of the first tube axis; a second inner circumferential surface that surrounds the second insertion port around the second tube axis in a range greater than 180° as viewed from the direction of the second tube axis; Including, an outer peripheral surface of the third pipe portion has a shape that follows the first inner peripheral surface and the second inner peripheral surface so that the wall thickness of the third pipe portion is within a predetermined range; The eccentric coupling of claim 5.

8. an angle of the third tube axis with respect to a direction perpendicular to the first tube axis and the second tube axis is equal to or greater than 40° and less than 90°; The eccentric coupling of claim 1.

9. In a plane including the first tube axis, the second tube axis, and the third tube axis, an inner circumferential surface of the third tube portion extends linearly along the third tube axis. The eccentric coupling of claim 1.

10. In a plane including the first tube axis, the second tube axis, and the third tube axis, an outer peripheral surface of the third tube portion extends linearly along the third tube axis. The eccentric coupling of claim 1.

11. an inner cylindrical portion located within the second tubular portion and having a central axis coinciding with the second tubular axis; a connecting portion that connects an entire circumference of an end of the inner cylindrical portion opposite to the second insertion port to an inner circumferential surface of at least one of the second pipe portion and the third pipe portion; Equipped with a gap is formed between an inner peripheral surface of the second pipe portion and an outer peripheral surface of the inner cylindrical portion, into which an end of a piping member to be connected to the second insertion port is accommodated; The eccentric coupling of claim 1.

12. an end of the inner cylindrical portion on the second insertion port side is located closer to the third pipe portion than the second insertion port; The eccentric coupling of claim 11.

13. The wall thickness of the inner tubular portion is smaller than the wall thickness of the second tubular portion. The eccentric coupling of claim 11.

14. an inner circumferential surface of the first pipe portion including an inclined portion in which an inner diameter of the first pipe portion decreases from the first insertion port toward the third pipe portion in the direction of the first pipe axis; The eccentric coupling of claim 1.

15. An eccentric joint according to any one of claims 1 to 14; a first piping member connected to the first insertion port; a second piping member connected to the second insertion port; Equipped with Piping system.

Images