Confluent joint and piping system

Abstract

To provide a confluent joint and a piping system capable of improving strength.SOLUTION: The confluent joint 3 includes a first pipe part 31 having a first insertion port 31a and a second insertion port 31b, and a second pipe part 32 projecting from the first pipe part 31 in a direction crossing a pipe axis C31 of the first pipe part 31 and having a third insertion port 32a. The outer diameter of the second pipe portion 32 is smaller than the outer diameter of the first pipe portion 31. A fillet 30 is provided between the outer peripheral surface 311 of the first pipe portion 31 and the outer peripheral surface 321 of the second pipe portion 32.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a junction fitting and a piping system. [Background technology]

[0002] Patent Document 1 discloses a piping structure (piping system) in which rainwater flowing down from the eaves of a roof in a building is received in an eaves gutter and drained downward. The piping structure disclosed in Patent Document 1 includes a siphon-type drainage member, a rainwater piping main body that drains rainwater flowing in from the siphon-type drainage member toward lower floors, a branch pipe connected to the rainwater piping main body at a junction on an intermediate floor, and a drainage pit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-100235 Summary of the Invention [Problem to be solved by the invention]

[0004] In the piping structure disclosed in Patent Document 1, drainage water from the branch pipe can be merged into the main rainwater pipe at the confluence formed by a tee, but the stress on the main rainwater pipe and the stress on the branch pipe tend to concentrate at the confluence, which can be a cause of damage to the confluence (confluence joint).

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

[0006] A merging fitting according to one embodiment of the present disclosure comprises a first pipe section having a first insertion port and a second insertion port, and a second pipe section protruding from the first pipe section in a direction intersecting the pipe axis of the first pipe section and having a third insertion port, wherein the pipe diameter of the second pipe section is smaller than the pipe diameter of the first pipe section, and there is a fillet between the outer peripheral surface of the first pipe section and the outer peripheral surface of the second pipe section.

[0007] A piping system according to one embodiment of the present disclosure includes the above-mentioned junction fitting, a first pipe connected to the first socket, a second pipe connected to the second socket, and a third pipe connected to the third 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 a junction joint in a piping system according to an embodiment; [Figure 3] 1 is a perspective view of a junction joint of a piping system according to an embodiment; [Figure 4] FIG. 1 is a top view of a junction joint of a piping system according to an embodiment; [Figure 5] 1 is a bottom view of a junction joint of a piping system according to an embodiment; [Figure 6] FIG. 1 is a side view of a junction joint of a piping system according to an embodiment, viewed from a first direction; [Figure 7] FIG. 10 is a side view of the junction joint of the piping system according to the embodiment, viewed from a second direction. [Figure 8] Cross section of line AA in Figure 4 [Figure 9] Cross section of line BB in Figure 6 [Figure 10] Cross section of line CC in Figure 6 [Figure 11] Enlarged view of the area indicated by P1 in Figure 8 [Figure 12] Enlarged view of the area indicated by P2 in Figure 10 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 this embodiment. The piping system 1 is used to transport a fluid. The fluid may be, for example, a fluid with a Reynolds number of 4000 or more. A fluid with a Reynolds number of 4000 or more is said to be a fluid whose flow within a cylinder becomes turbulent. Examples of fluids with a Reynolds number of 4000 or more 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).

[0014] In this embodiment, the piping system 1 is used as a drainage system. The piping system 1 is installed in a building 100. The building 100 is, for example, an apartment building and has multiple balconies 110 (110-1, 110-2). The piping system 1 is a gutter system that collects rainwater from the balconies 110-1, 110-2 of the building 100 and drains it into a manhole on the ground. The piping system 1 forms a rainwater flow path. The rainwater collected in the manhole flows from the manhole to a storm sewer through buried pipes. The building 100 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 an individual dwelling unit in 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, airports, etc.

[0015] The piping system 1 includes a main pipe 10 and a plurality of branch pipes 11 (11-1, 11-2). The piping system 1 allows rainwater to flow from the plurality of branch pipes 11 into the main pipe 10 and then drains the rainwater.

[0016] The main pipe 10 carries rainwater, for example, from the balcony or rooftop on the top floor of the building 100. The main pipe 10 includes a plurality of vertical pipes 2 (2-1, 2-2, 2-3) and a plurality of junction joints 3 (3-1, 3-2).

[0017] The standpipe 2 defines a vertical flow path. In a gutter system, the standpipe 2 is also called a downspout. The standpipe 2 is a straight pipe. The cross section perpendicular to the central axis of the standpipe 2 is circular. The standpipe 2 is arranged so that the direction of the central axis of the standpipe 2 coincides with the up-down direction (vertical direction).

[0018] The confluence fitting 3 connects the branch pipe 11 to the main pipe 10. The confluence fitting 3 has a first socket 3a facing upward, a second socket 3b facing downward, and a third socket 3c facing sideways. The confluence fitting 3 combines the fluid flowing in from the first socket 3a with the fluid flowing in from the third socket 3c, and allows the fluid to flow out from the second socket 3b. The confluence fitting 3 will be described in more detail later.

[0019] In the main pipe 10, the junction joint 3-1 connects the standpipes 2-1 and 2-2 to each other. The downstream end of the standpipe 2-1 is connected to the first socket 3a of the junction joint 3-1, and the upstream end of the standpipe 2-2 is connected to the second socket 3b of the junction joint 3-1. The junction joint 3-2 connects the standpipes 2-2 and 2-3 to each other. The downstream end of the standpipe 2-2 is connected to the first socket 3a of the junction joint 3-2, and the upstream end of the standpipe 2-3 is connected to the second socket 3b of the junction joint 3-2.

[0020] The branch pipes 11, for example, carry rainwater from balconies 110 of a building 100 to the main pipe 10. The branch pipes 11 (11-1, 11-2) include vertical pipes 4 (4-1, 4-2), elbows 5 (5-1, 5-2), horizontal pipes 6 (6-1, 6-2), and drains 7 (7-1, 7-2).

[0021] The standpipe 4 defines a vertical flow path. In a gutter system, the standpipe 4 is also called a downspout. The standpipe 4 is installed to drain rainwater from the balcony 110. The standpipe 4 forms a rainwater inlet in the balcony 110. The standpipe 4 drains rainwater from the balcony 110 vertically. The standpipe 4 is a straight pipe. A cross section perpendicular to the central axis of the standpipe 4 is circular. The standpipe 4 is arranged so that the direction of the central axis of the standpipe 4 coincides with the up-and-down direction (vertical direction).

[0022] The elbow 5 changes the direction of the flow path. The elbow 5 is a connecting joint that connects flow paths with different directions, such as a vertical pipe 4 and a horizontal pipe 6. The elbow 5 has a first socket 5a and a second socket 5b. The angle between the center lines of the first socket 5a and the second socket 5b is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe joints for drainage."

[0023] The horizontal pipe 6 defines a flow path that intersects with the vertical direction. In a gutter system, the horizontal pipe 6 is also called a call gutter. The horizontal pipe 6 is the part that carries rainwater from the balcony 110 from the vertical pipe 4 to the main pipe 10. The horizontal pipe 6 is located between the vertical pipe 4 and the junction joint 3. The horizontal pipe 6 is a straight pipe. The cross section perpendicular to the central axis of the horizontal pipe 6 is circular. The horizontal pipe 6 is arranged so that the direction of the central axis of the horizontal pipe 6 is inclined with respect to the up-down direction (vertical direction).

[0024] The drain 7 is disposed at the upstream end of the riser 4. The drain 7 reduces the generation of vortices and entrainment of air in the riser 4. The drain 7 may have a known configuration.

[0025] In the branch pipe 11-1, the elbow 5-1 connects the stand pipe 4-1 to the horizontal pipe 6-1. The downstream end of the stand pipe 4-1 is connected to the first socket 5a of the elbow 5-1, and the upstream end of the horizontal pipe 6-1 is connected to the second socket 5b of the elbow 5-1. The downstream end of the horizontal pipe 6-1 is connected to the third socket 3c of the junction joint 3-1. In the branch pipe 11-2, the elbow 5-2 connects the stand pipe 4-2 to the horizontal pipe 6-2. The downstream end of the stand pipe 4-2 is connected to the first socket 5a of the elbow 5-2, and the upstream end of the horizontal pipe 6-2 is connected to the second socket 5b of the elbow 5-2. The downstream end of the horizontal pipe 6-2 is connected to the third socket 3c of the junction joint 3-2.

[0026] As an example, the material of the standpipe 2, the standpipe 4, and the horizontal pipe 6 is rigid polyvinyl chloride. The dimensions of the standpipe 2, the standpipe 4, and the horizontal pipe 6, 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."

[0027] For example, the material of the elbow 5 may be rigid polyvinyl chloride. The dimensions of the elbow 5 may be set in accordance with the standard of JIS K 6739 "Rigid polyvinyl chloride pipe joints for drainage," for example.

[0028] The piping system 1 described above can drain rainwater by merging it from the branch pipes 11-1 and 11-2 into the main pipe 10. In the piping system 1, stresses acting on the main pipe 10 and on the branch pipes 11-1 and 11-2 can be concentrated at the merging joints 3-1 and 3-2. In this embodiment, to reduce the possibility of damage to the merging joints 3-1 and 3-2 due to such stress concentration, the merging joints 3-1 and 3-2 have a structure with improved strength.

[0029] The junction joints 3-1 and 3-2 will be described in further detail below with reference to Figures 2 to 12. Since the junction joints 3-1 and 3-2 have the same structure, in the following description, the junction joints 3-1 and 3-2 will be referred to as the junction joint 3 without any distinction between them.

[0030] FIG. 2 is a cross-sectional view of a portion including a junction joint 3 (junction joint 3-1 in FIG. 2) in the piping system 1. FIG. 3 is a perspective view of the junction joint 3, FIG. 4 is a top view of the junction joint 3, FIG. 5 is a bottom view of the junction joint 3, FIG. 6 is a side view of the junction joint 3 from a first direction, FIG. 7 is a side view of the junction joint 3 from a second direction, FIG. 8 is a cross-sectional view taken along line AA in FIG. 4, FIG. 9 is a cross-sectional view taken along line BB in FIG. 6, and FIG. 10 is a cross-sectional view taken along line CC in FIG. 6. FIG. 11 is an enlarged view of the portion indicated by P1 in FIG. 8. FIG. 12 is an enlarged view of the portion indicated by P2 in FIG. 10.

[0031] As can be seen from FIGS. 2 and 3, the confluence joint 3 includes a first pipe portion 31 and a second pipe portion 32.

[0032] The first pipe section 31 is a section that connects the vertical pipes 2 that constitute the main pipe 10. The first pipe section 31 constitutes the flow path of the main pipe 10.

[0033] As shown in FIGS. 4 to 6, the first pipe portion 31 has a straight pipe shape. As shown in FIGS. 4, 5, and 8, the first pipe portion 31 has an outer circumferential surface 311 and an inner circumferential surface 312. As shown in FIG. 10, the cross section of the first pipe portion 31 perpendicular to the pipe axis C31 is circular. The outer diameter of the first pipe portion 31 is constant in the direction of the pipe axis C31 of the first pipe portion 31. The first pipe portion 31 has a first insertion opening 31a and a second insertion opening 31b at both ends in the direction of the pipe axis C31. In this embodiment, the first insertion opening 31a and the second insertion opening 31b are circular openings. The end of the first pipe portion 31 on the first insertion opening 31a side forms the first socket 3a. The inner diameter of first insertion port 31a is larger than the outer diameter of the first pipe connected to first insertion port 31a (standpipe 2-1 in the case of junction joint 3-1, and standpipe 2-2 in the case of junction joint 3-2). The end of first pipe section 31 on the second insertion port 31b side forms second socket 3b. The inner diameter of second insertion port 31b is larger than the outer diameter of the second pipe connected to second insertion port 31b (standpipe 2-2 in the case of junction joint 3-1, and standpipe 2-3 in the case of junction joint 3-2). In this embodiment, the inner diameters of first insertion port 31a and second insertion port 31b are set so as to correspond to pipes of the same outer diameter.

[0034] The second pipe section 32 is a section that connects the branch pipe 11 to the main pipe.

[0035] 7, the second tubular portion 32 has a straight tubular shape. The second tubular portion 32 has an outer circumferential surface 321 and an inner circumferential surface 322. The cross section of the second tubular portion 32 perpendicular to the tubular axis C32 is circular. The outer diameter of the second tubular portion 32 is constant in the direction of the tubular axis C32 of the second tubular portion 32.

[0036] 8, the second pipe portion 32 protrudes from the first pipe portion 31 in a direction intersecting the pipe axis C31 of the first pipe portion 31. More specifically, the second pipe portion 32 protrudes outward from the outer circumferential surface 311 of the first pipe portion 31. The internal space of the second pipe portion 32 is connected to the internal space of the first pipe portion 31. Therefore, the inner circumferential surface 322 of the second pipe portion 32 is connected to the inner circumferential surface 312 of the first pipe portion 31. In this embodiment, the second pipe portion 32 is formed continuously and integrally with the first pipe portion 31.

[0037] As shown in FIG. 8, the pipe axis C32 of the second pipe section 32 intersects with the pipe axis C31 of the first pipe section 31. The angle θ1 between the pipe axis C31 of the first pipe section 31 and the pipe axis C32 of the second pipe section 32 (particularly, the angle between the central axis of the first insertion port 31a and the central axis of the third insertion port 32a) is 90° or less. For example, θ1 is 88.83°. When θ1 is approximately 90° in this manner, the merging joint 3 is also called a tee. In particular, when the outer diameter of the second pipe section 32 is smaller than the outer diameter of the first pipe section 31, the merging joint 3 is also called a reducing tee.

[0038] The second pipe section 32 has a third insertion port 32a. The third insertion port 32a is located on the opposite side of the second pipe section 32 from the first pipe section 31 in the direction of the pipe axis C32. The end of the second pipe section 32 on the third insertion port 32a side forms a third socket 3c. The inner diameter of the third insertion port 32a is larger than the outer diameter of the third pipe (the horizontal pipe 6-1 in the case of the junction joint 3-1, and the horizontal pipe 6-2 in the case of the junction joint 3-2) connected to the third insertion port 32a. In this embodiment, the inner diameter of the third insertion port 32a is smaller than the inner diameters of the first insertion port 31a and the second insertion port 31b.

[0039] The sizes (particularly outer diameter, thickness, inner diameter, etc.) of the first pipe section 31 and the second pipe section 32 may be set appropriately according to the size of the pipes to be connected to the junction joint 3. 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."

[0040] 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.

[0041] [Table 1]

[0042] 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.

[0043] [Table 2]

[0044] As an example, the outer diameters of the first pipe section 31 and the second pipe section 32 may be 60 mm to 140 mm (i.e., VU50 to VU125). However, in this embodiment, the outer diameter of the second pipe section 32 is smaller than the outer diameter of the first pipe section 31. Here, the pipe diameter of the second pipe section 32 is preferably smaller than the pipe diameter of the first pipe section 31 by one size or more. In this embodiment, the pipe diameter of the second pipe section 32 is smaller than the pipe diameter of the first pipe section 31 by one size. Note that the pipe diameters of the first pipe section 31 and the second pipe section 32 may be the nominal diameters described above, or may be sizes set by manufacturers selling piping or the like, and examples thereof include 60 mm, 76 mm, 89 mm, 114 mm, and 140 mm.

[0045] In the junction joint 3, a fillet 30 is present between the outer circumferential surface 311 of the first pipe section 31 and the outer circumferential surface 321 of the second pipe section 32. In other words, the outer circumferential surface 311 of the first pipe section 31 and the outer circumferential surface 321 of the second pipe section 32 are indirectly connected via the fillet 30 rather than being directly connected. The presence of the fillet 30 can mitigate stress concentration at the boundary between the first pipe section 31 and the second pipe section 32 compared to when the fillet 30 is not present. This makes it possible to improve the strength of the junction joint 3.

[0046] In this embodiment, the surface of the fillet 30 is concave. Here, the radius of curvature of the surface of the fillet 30 is preferably 3 mm or more. This further alleviates stress concentration at the boundary between the first tubular portion 31 and the second tubular portion 32, and furthermore, the thickness of the fillet 30 is ensured, enabling the strength of the fillet 30 itself to be improved. The radius of curvature of the surface of the fillet 30 is preferably 10 mm or less. If the radius of curvature of the fillet 30 exceeds 10 mm, uneven thickness of the fillet 30 may make it difficult to distribute stress.

[0047] 7, the fillet 30 surrounds (over the entire periphery of) the second pipe portion 32 when viewed from the direction of the pipe axis C32 of the second pipe portion 32. This makes it possible to improve the strength of the junction joint 3.

[0048] In the piping system 1, when the main pipe 10 expands or contracts due to heat, the position of the main pipe 10 relative to the branch pipe 11 is displaced in the vertical direction, and stress is likely to be applied in the vertical direction (the direction of the pipe axis C31 of the first pipe section 31) between the first pipe section 31 and the second pipe section 32 of the junction joint 3. Therefore, when viewed from the direction of the pipe axis C32 of the second pipe section 32, the outer peripheral shape of the fillet 30 is an ellipse whose major axis is the direction of the pipe axis C31 of the first pipe section 31. This makes it possible to improve strength against stress in the direction of the pipe axis C31. As a result, the possibility of damage to the junction joint 3 can be further reduced.

[0049] 8 and 10 to 12, the thickness of the fillet 30 is not uniform. Here, the thickness of the fillet 30 may be the shortest distance between the boundary portion between the outer peripheral surface 311 of the first tubular portion 31 and the outer peripheral surface 321 of the second tubular portion 32 in the absence of the fillet 30 and the surface of the fillet 30. In FIGS. 11 and 12, the outer peripheral surface 311 of the first tubular portion 31 and the outer peripheral surface 321 of the second tubular portion 32 in the absence of the fillet 30 are indicated by dashed lines.

[0050] In particular, in this embodiment, the thickness d1 (see FIG. 11) of the fillet 30 in a plane including the tube axis C31 of the first tube portion 31 and the tube axis C32 of the second tube portion 32 is larger than the thickness d2 (see FIG. 12) of the fillet 30 in a plane including the tube axis C32 of the second tube portion 32 and a direction perpendicular to the tube axis C31 of the first tube portion 31 and the tube axis C32 of the second tube portion 32. This makes it possible to improve strength against stress in the direction of the tube axis C31.

[0051] 11 and 12, the radius of curvature of the surface of the fillet 30 is not uniform. In particular, in this embodiment, the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C31 of the first tube portion 31 and the tube axis C32 of the second tube portion 32 is smaller than the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C32 of the second tube portion 32 and a direction perpendicular to the tube axis C31 of the first tube portion 31 and the tube axis C32 of the second tube portion 32. This makes it possible to improve strength against stress in the direction of the tube axis C31. In particular, the radius of curvature of the surface of the fillet 30 may vary around the tube axis C32 of the second tube section 32 so that the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C31 of the first tube section 31 and the tube axis C32 of the second tube section 32 is minimum, and the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C32 of the second tube section 32 and a direction perpendicular to the tube axis C31 of the first tube section 31 and the tube axis C32 of the second tube section 32, respectively, is maximum. As an example, the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C31 of the first tube section 31 and the tube axis C32 of the second tube section 32 may be 5 mm, and the radius of curvature of the surface of the fillet 30 in a plane including the tube axis C32 of the second tube section 32 and a direction perpendicular to the tube axis C31 of the first tube section 31 and the tube axis C32 of the second tube section 32 may be 10 mm.

[0052] 8 and 9, the inner diameter of the first pipe section 31 is not constant in the direction of the pipe axis C31 of the first pipe section 31. The inner circumferential surface 312 of the first pipe section 31 includes a sloped portion 312a between the first insertion opening 31a of the first pipe section 31 and the second pipe section 32. The sloped portion 312a reduces the inner diameter of the first pipe section 31 from the first insertion opening 31a toward the second pipe section 32 in the direction of the pipe axis C31 of the first pipe section 31. The sloped portion 312a comes into contact with the piping (upright pipes 2-1 and 2-2) inserted into the first pipe section 31 from the first insertion opening 31a, stabilizing the connection of the piping to the first pipe section 31. That is, this configuration improves the stability of the connection to the first insertion opening 31a. Here, it is preferable that the inner diameter of the first pipe section 31 at the inclined section 312a is larger than the inner diameter of the piping (upright pipes 2-1 and 2-2) inserted from the first insertion port 31a into the first pipe section 31. This makes it possible to ignore the influence of the inclined section 312a on the flow path of the piping inserted from the first insertion port 31a into the first pipe section 31.

[0053] 8 and 9, the confluence joint 3 further includes a first protruding portion 33 and a second protruding portion 34. The first protruding portion 33 and the second protruding portion 34 are formed integrally with the first pipe portion 31.

[0054] The first protrusion 33 is located between the second pipe section 32 and the second insertion port 31b in the direction of the pipe axis C31 of the first pipe section 31, and protrudes from the inner circumferential surface 312 of the first pipe section 31 toward the pipe axis C31 of the first pipe section 31. The first protrusion 33 is plate-shaped and has a uniform thickness. The first protrusion 33 has an opening 331. The opening 331 is located in the center of the first protrusion 33. As shown in FIG. 10 , when viewed from the direction of the pipe axis C31 of the first pipe section 31, the opening 331 is circular, and the first protrusion 33 is annular. The first protrusion 33 comes into contact with the piping (upright pipes 2-2, 2-3) inserted into the first pipe section 31 from the second insertion port 31b, thereby stabilizing the connection of the piping to the first pipe section 31. In the junction fitting 3, because the fluid is discharged from the second insertion port 31b, rainwater or the like may enter the gap between the first pipe section 31 and the piping, causing water to accumulate. If the water that accumulates in the gap freezes, it may cause damage to the junction fitting 3 or the piping. However, the first protrusion 33 covers the gap between the inner circumferential surface 312 of the first pipe section 31 and the piping inserted into the first pipe section 31 from the second insertion port 31b. This reduces the possibility that rainwater or the like may enter the gap between the first pipe section 31 and the piping, causing water to accumulate.

[0055] In this way, the first protrusion 33 is used to stabilize the connection state of the piping to the first pipe section 31. As the protrusion amount of the first protrusion 33 from the inner circumferential surface 312 of the first pipe section 31 increases, that is, as the inner diameter of the opening 331 decreases, the contact state between the first protrusion 33 and the piping inserted into the first pipe section 31 from the second insertion port 31b tends to be stable. However, as the protrusion amount of the first protrusion 33 from the inner circumferential surface 312 of the first pipe section 31 increases, the first protrusion 33 tends to cause pressure loss in the flow path of the junction fitting 3. For this reason, the protrusion amount of the first protrusion 33 from the inner circumferential surface 312 of the first pipe section 31 is set to an amount that does not substantially cause pressure loss or is negligible compared to a state in which the piping is connected to the second insertion port 31b.

[0056] The second protrusion 34 protrudes from the tip of the first protrusion 33 toward the second insertion port 31b. In this embodiment, the second protrusion 34 protrudes from the edge of the opening 331 of the first protrusion 33 toward the second insertion port 31b. At the opening 331, the corner between the first protrusion 33 and the second protrusion 34 is rounded. This reduces pressure loss at the corner between the first protrusion 33 and the second protrusion 34.

[0057] 5, the second protrusion 34 surrounds the entire circumference of the opening 331. In this embodiment, the second protrusion 34 is cylindrical. The outer diameter of the second protrusion 34 is smaller than the inner diameter of the first pipe portion 31. As a result, an annular gap G exists between the inner circumferential surface 312 of the first pipe portion 31 and the second protrusion 34. As shown in FIG. 2, the ends of the pipes (standpipes 2-2 and 2-3) connected to the second insertion port 31b are inserted into the gap G. In other words, the gap G is formed between the inner circumferential surface 312 of the first pipe portion 31 and the second protrusion 34, and the ends of the pipes (standpipes 2-2 and 2-3) connected to the second insertion port 31b fit therein.

[0058] The second protrusion 34 can guide rainwater from the first outlet 31a and the third outlet 32a into the piping (standpipes 2-2 and 2-3) connected to the second outlet 31b. This reduces the possibility that rainwater or the like will enter the gap between the first protrusion 33 and the piping (standpipes 2-2 and 2-3) connected to the second outlet 31b from the first outlet 31a and the third outlet 32a, thereby enabling a smooth flow of water from the first outlet 31a and the third outlet 32a to the second outlet 31b.

[0059] 8 and 9, the inner diameter of the second pipe section 32 is not constant in the direction of the pipe axis C32 of the second pipe section 32. The inner circumferential surface 322 of the second pipe section 32 includes a sloped portion 322a between the third insertion port 32a of the second pipe section 32 and the first pipe section 31. The sloped portion 322a reduces the inner diameter of the second pipe section 32 from the third insertion port 32a toward the first pipe section 31 in the direction of the pipe axis C32 of the second pipe section 32. The sloped portion 322a contacts the piping (horizontal pipes 6-1, 6-2) inserted into the second pipe section 32 from the third insertion port 32a, stabilizing the connection of the piping to the second pipe section 32. In other words, this configuration improves the stability of the connection to the third insertion port 32a. Here, it is preferable that the inner diameter of the second pipe section 32 at the inclined portion 322a is larger than the inner diameter of the piping (horizontal pipes 6-1, 6-2) inserted from the third insertion port 32a into the second pipe section 32. This makes it possible to ignore the effect of the inclined portion 322a on the flow path of the piping inserted from the third insertion port 32a into the second pipe section 32.

[0060] 8 and 9, the confluence joint 3 includes a receiving portion 35. The receiving portion 35 is located at the corner between the first insertion port 31a and the third insertion port 32a.

[0061] 11, the receiving portion 35 protrudes from the corner between the first insertion port 31a and the third insertion port 32a toward both the tube axis C31 side of the first pipe portion 31 and the tube axis C32 side of the second pipe portion 32. As a result, the receiving portion 35 has a first surface 35a facing the first insertion port 31a side and a second surface 35b facing the third insertion port 32a side.

[0062] The receiving portion 35 contacts the piping (upright pipes 2-1 and 2-2) inserted into the first pipe portion 31 through the first insertion port 31a, stabilizing the connection of the piping to the first pipe portion 31. This improves the stability of the connection to the first insertion port 31a. In particular, the first surface 35a of the receiving portion 35 is located at a position corresponding to the inclined portion 312a in the direction of the pipe axis C31 of the first pipe portion 31. This allows the receiving portion 35 and the inclined portion 312a to cooperate to stabilize the connection of the piping to the first pipe portion 31. The amount s1 of protrusion of the receiving portion 35 toward the pipe axis C31 of the first pipe portion 31 is equal to or less than twice the wall thickness of the piping (upright pipes 2-1 and 2-2) connected to the first insertion port 31a. The wall thickness of the piping is the difference between the outer radius and the inner radius of the piping. This reduces the possibility that the receiving portion 35 will protrude into the inside of the piping. Therefore, the influence of receiving portion 35 on the flow path of the pipe connected to first insertion port 31a can be ignored.

[0063] The receiving portion 35 contacts the piping (horizontal pipes 6-1 and 6-2) inserted into the second pipe portion 32 through the third insertion port 32a, stabilizing the connection of the piping to the second pipe portion 32. This improves the stability of the connection to the third insertion port 32a. In particular, the second surface 35b of the receiving portion 35 is located at a position corresponding to the inclined portion 322a in the direction of the pipe axis C32 of the second pipe portion 32. This allows the receiving portion 35 and the inclined portion 322a to cooperate to stabilize the connection of the piping to the second pipe portion 32. The amount of protrusion s2 of the receiving portion 35 toward the pipe axis C32 of the second pipe portion 32 is less than twice the wall thickness of the piping (horizontal pipes 6-1 and 6-2) connected to the third insertion port 32a. This reduces the possibility that the receiving portion 35 will protrude into the inside of the piping. Therefore, the influence of the receiving portion 35 on the flow path of the piping connected to the third insertion port 32a can be ignored.

[0064] [1.2 Effects, etc.] The junction joint 3 described above comprises a first pipe section 31 having a first insertion port 31a and a second insertion port 31b, and a second pipe section 32 having a third insertion port 32a and protruding from the first pipe section 31 in a direction intersecting the pipe axis C31 of the first pipe section 31. The outer diameter of the second pipe section 32 is smaller than the outer diameter of the first pipe section 31. A fillet 30 is provided between the outer peripheral surface 311 of the first pipe section 31 and the outer peripheral surface 321 of the second pipe section 32. This configuration enables improvement in strength.

[0065] In the confluence joint 3, the surface of the fillet 30 is concave. This configuration allows for further improvement in strength.

[0066] In the confluence joint 3, the radius of curvature of the surface of the fillet 30 is 3 mm or more and 10 mm or less. This configuration enables further improvement in strength.

[0067] In the confluence joint 3, the outer diameter of the first pipe section 31 is constant in the direction of the pipe axis C31, C32 of the first pipe section 31, and the outer diameter of the second pipe section 32 is constant in the direction of the pipe axis C31, C32 of the second pipe section 32. This configuration reduces the number of areas where stress is likely to concentrate, allowing for further improvement in strength and design.

[0068] In the confluence joint 3, when viewed from the direction of the pipe axis C32 of the second pipe portion 32, the fillet 30 surrounds the second pipe portion 32. This configuration enables further improvement in strength.

[0069] In the confluence joint 3, when viewed from the direction of the pipe axis C32 of the second pipe section 32, the outer peripheral shape of the fillet 30 is an ellipse with its major axis directed in the direction of the pipe axis C31 of the first pipe section 31. This configuration makes it possible to improve the strength of the first pipe section 31 against stress in the direction of the pipe axis C31.

[0070] In the confluence joint 3, the thickness of the fillet 30 in a plane including the pipe axis C31 of the first pipe section 31 and the pipe axis C32 of the second pipe section 32 is greater than the thickness of the fillet 30 in a plane including the pipe axis C32 of the second pipe section 32 and a direction perpendicular to the pipe axis C31 of the first pipe section 31 and the pipe axis C32 of the second pipe section 32. This configuration enables improvement of the strength of the first pipe section 31 against stress in the direction of the pipe axis C31.

[0071] In the confluence joint 3, the radius of curvature of the surface of the fillet 30 in a plane including the pipe axis C31 of the first pipe portion 31 and the pipe axis C32 of the second pipe portion 32 is smaller than the radius of curvature of the surface of the fillet 30 in a plane including the pipe axis C32 of the second pipe portion 32 and a direction perpendicular to the pipe axis C31 of the first pipe portion 31 and the pipe axis C32 of the second pipe portion 32. This configuration enables improvement of the strength of the first pipe portion 31 against stress in the direction of the pipe axis C31.

[0072] The junction fitting 3 further includes a first protrusion 33 that protrudes from an inner circumferential surface 312 of the first pipe portion 31 toward the pipe axis C31 of the first pipe portion 31 between the second pipe portion 32 and the second insertion port 31b in the direction of the pipe axis C31 of the first pipe portion 31, and a second protrusion 34 that protrudes from a tip of the first protrusion 33 toward the second insertion port 31b. A gap G is formed between the inner circumferential surface 312 of the first pipe portion 31 and the second protrusion 34, and fits the end of the piping (upright pipes 2-2, 2-3) connected to the second insertion port 31b. This configuration improves the stability of the connection to the second insertion port 31b.

[0073] In the confluence joint 3, the inner circumferential surface 312 of the first pipe section 31 includes a sloped portion 312a between the first insertion port 31a of the first pipe section 31 and the second pipe section 32, where the inner diameter of the first pipe section 31 decreases from the first insertion port 31a toward the second pipe section 32 in the direction of the pipe axis C31 of the first pipe section 31. This configuration enables improved stability of connection to the first insertion port 31a.

[0074] In the confluence joint 3, the inner circumferential surface 322 of the second pipe section 32 includes a sloped portion 322a in which the inner diameter of the second pipe section 32 decreases from the third insertion port 32a toward the first pipe section 31 in the direction of the pipe axis C32 of the second pipe section 32. This configuration enables improved stability of the connection to the third insertion port 32a.

[0075] The junction joint 3 further includes a receiving portion 35 that protrudes from the corner between the first socket 31a and the third socket 32a toward at least one of the pipe axis C31 side of the first pipe section 31 and the pipe axis C32 side of the second pipe section 32. This configuration improves the stability of the connection to at least one of the first socket 31a and the third socket 32a.

[0076] In the confluence joint 3, the amount of protrusion of the receiving portion 35 toward the pipe axis C31 of the first pipe portion 31 is equal to or less than twice the wall thickness of the piping (upright pipes 2-1, 2-2) connected to the first insertion port 31a. With this configuration, the influence of the receiving portion 35 on the flow path of the piping connected to the first insertion port 31a can be ignored.

[0077] In the confluence fitting 3, the amount of protrusion of the receiving portion 35 toward the pipe axis C32 of the second pipe portion 32 is equal to or less than twice the thickness of the piping (horizontal pipes 6-1, 6-2) connected to the third insertion port 32a. With this configuration, the influence of the receiving portion 35 on the flow path of the piping connected to the third insertion port 32a can be ignored.

[0078] In the confluence joint 3, the pipe diameter of the second pipe section 32 is smaller by one size or more than the pipe diameter of the first pipe section 31. This configuration makes it possible to improve the strength.

[0079] The piping system 1 described above includes the junction joint 3 (3-1, 3-2), the first pipes (vertical pipes 2-1, 2-2) connected to the first socket 31a, the second pipes (vertical pipes 2-2, 2-3) connected to the second socket 31b, and the third pipes (horizontal pipes 6-1, 6-2) connected to the third socket 32a. This configuration improves the strength of the system.

[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] In one variation, the thickness of the fillet 30 may be uniform. Similarly, the radius of curvature of the surface of the fillet 30 may be uniform.

[0082] In one modified example, the angle θ1 between the pipe axis C31 of the first pipe section 31 and the pipe axis C32 of the second pipe section 32 is not limited to 88.83°. θ1 may be 45°, as long as it is 90° or less. In this case, the junction joint 3 may be called a Y-pipe rather than a T-pipe.

[0083] In one modified example, the first protrusion 33 and the second protrusion 34 are not essential. Instead of the first protrusion 33, the inner circumferential surface 312 of the first pipe portion 31 may have a sloped portion between the second insertion port 31b of the first pipe portion 31 and the second pipe portion 32, where the inner diameter of the first pipe portion 31 decreases from the second insertion port 31b toward the second pipe portion 32 in the direction of the pipe axis C31 of the first pipe portion 31.

[0084] In one modified example, the receiving portion 35 may protrude from the corner between the first insertion port 31a and the third insertion port 32a toward at least one of the tube axis C31 side of the first pipe portion 31 and the tube axis C32 side of the second pipe portion 32. The receiving portion 35 is not essential.

[0085] In one variant, the material of the junction joint 3 does not necessarily have to be rigid polyvinyl chloride, but may be determined according to the requirements of the piping system 1, and may be, for example, a synthetic resin such as polyethylene or a metal.

[0086] In one modified example, the shape and size of part or all of the junction joint 3 may be different from those in the above embodiment. For example, unlike the above embodiment, the shapes of the first pipe section 31 and the second pipe section 32 may be polygonal rather than circular.

[0087] In one variant, the number of branches 11 in the piping system 1 is not limited to two, but may be one or three or more.

[0088] In one variation, the piping system 1 may include a gutter. In this case, the downpipe 4 is connected to the outlet of the gutter. Such a piping system 1 can be applied when the building 100 includes a roof, eaves, or the like.

[0089] In one modification, the piping system 1 is not limited to a gutter system, which is a type of drainage system, but may also be applied to other drainage systems such as a sewerage system, or to water supply systems such as a drinking water system. In other words, the junction fitting 3 can be used in a system that supplies or drains water. The piping system 1 can also be a piping system for transporting a target fluid within a facility such as a factory. In other words, the fluid transported by the piping system 1 is not limited to rainwater.

[0090] [3. Aspects] As is apparent from the above-described embodiment and modifications, the present disclosure includes the following aspects.

[0091] [Aspect 1] a first pipe portion having a first outlet and a second outlet; a second pipe portion protruding from the first pipe portion in a direction intersecting the pipe axis of the first pipe portion and having a third insertion port; Equipped with The outer diameter of the second pipe portion is smaller than the outer diameter of the first pipe portion, A fillet is provided between the outer circumferential surface of the first pipe portion and the outer circumferential surface of the second pipe portion. Confluence fitting.

[0092] [Aspect 2] The surface of the fillet is concave. A confluence joint according to embodiment 1.

[0093] [Aspect 3] The radius of curvature of the surface of the fillet is 3 mm or more and 10 mm or less. A confluence joint of embodiment 2.

[0094] [Aspect 4] The outer diameter of the first tubular portion is constant in the direction of the tubular axis of the first tubular portion, The outer diameter of the second tubular portion is constant in the direction of the tubular axis of the second tubular portion. The confluence joint according to any one of aspects 1 to 3.

[0095] [Aspect 5] When viewed from the direction of the tube axis of the second tube portion, the fillet surrounds the second tube portion. The confluence joint according to any one of aspects 1 to 4.

[0096] [Aspect 6] When viewed from the direction of the tube axis of the second tube portion, the outer peripheral shape of the fillet is an elliptical shape whose major axis is in the direction of the tube axis of the first tube portion. A confluence joint according to embodiment 5.

[0097] [Aspect 7] a thickness of the fillet in a plane including the tube axis of the first tube portion and the tube axis of the second tube portion is larger than a thickness of the fillet in a plane including the tube axis of the second tube portion and a direction perpendicular to the tube axis of the first tube portion and the tube axis of the second tube portion, respectively; The confluence joint of aspect 5 or 6.

[0098] [Aspect 8] a radius of curvature of the surface of the fillet in a plane including the tube axis of the first tube portion and the tube axis of the second tube portion is smaller than a radius of curvature of the surface of the fillet in a plane including the tube axis of the second tube portion and a direction perpendicular to the tube axis of the first tube portion and the tube axis of the second tube portion, The confluence joint of aspect 5 or 6.

[0099] [Aspect 9] a first protrusion located between the second pipe portion and the second insertion port in the pipe axis direction of the first pipe portion and protruding from an inner circumferential surface of the first pipe portion toward the pipe axis side of the first pipe portion; a second protruding portion protruding from a tip of the first protruding portion toward the second insertion port; Furthermore, A gap is formed between the inner circumferential surface of the first pipe portion and the second protrusion portion, into which an end of a pipe connected to the second insertion port is accommodated. The confluence joint according to any one of aspects 1 to 8.

[0100] [Aspect 10] The inner circumferential surface of the first pipe portion includes a sloped portion between the first insertion port of the first pipe portion and the second pipe portion, in which the inner diameter of the first pipe portion decreases from the first insertion port toward the second pipe portion in the pipe axis direction of the first pipe portion. The confluence joint according to any one of embodiments 1 to 9.

[0101] [Aspect 11] The inner circumferential surface of the second pipe portion includes a sloped portion in which the inner diameter of the second pipe portion decreases from the third insertion port toward the first pipe portion in the pipe axis direction of the second pipe portion. The confluence joint according to any one of aspects 1 to 10.

[0102] [Aspect 12] Further provided is a receiving portion that protrudes from a corner between the first insertion port and the third insertion port toward at least one of the tube axis side of the first pipe portion and the tube axis side of the second pipe portion. The confluence joint according to any one of aspects 1 to 11.

[0103] [Aspect 13] The amount of protrusion of the receiving portion toward the pipe axis side of the first pipe portion is equal to or less than twice the wall thickness of the pipe connected to the first insertion port. A confluence joint according to aspect 12.

[0104] [Aspect 14] The amount of protrusion of the receiving portion toward the pipe axis side of the second pipe portion is equal to or less than twice the wall thickness of the pipe connected to the third insertion port. The confluence joint of aspect 12 or 13.

[0105] [Aspect 15] The pipe diameter of the second pipe portion is smaller than the pipe diameter of the first pipe portion by one size or more. The confluence joint according to any one of aspects 1 to 14.

[0106] [Aspect 16] A confluence joint according to any one of aspects 1 to 15; a first pipe connected to the first outlet; A second pipe connected to the second outlet; a third pipe connected to the third outlet; Equipped with Piping system.

[0107] Aspects 2 to 15 are optional elements and are not essential. [Industrial Applicability]

[0108] The present disclosure is applicable to a junction joint and a piping system. Specifically, the present disclosure is applicable to a junction joint for connecting a branch pipe to a main pipe, and a piping system including the junction joint. [Explanation of symbols]

[0109] 1 Piping System 2, 2-1, 2-2, 2-3 vertical pipe 3, 3-1, 3-2 Confluence joint 30 fillets 31 First Pipe Section 31a 1st outlet 31b Second outlet 311 Outer surface 312 Inner surface 312a Slope 32 Second Pipe Section 32a Third Outlet 321 Outer surface 322 Inner surface 322a Slope 33 1st protrusion 34 Second protrusion 35 Receiving part 6, 6-1, 6-2 horizontal pipe

Claims

1. a first pipe portion having a first outlet and a second outlet; a second pipe portion protruding from the first pipe portion in a direction intersecting a pipe axis of the first pipe portion and having a third insertion port; Equipped with The outer diameter of the second pipe portion is smaller than the outer diameter of the first pipe portion, A fillet is provided between the outer circumferential surface of the first pipe portion and the outer circumferential surface of the second pipe portion. Confluence fitting.

2. The surface of the fillet is concave. The confluence joint of claim 1.

3. The radius of curvature of the surface of the fillet is 3 mm or more and 10 mm or less. The confluence joint of claim 2.

4. an outer diameter of the first tubular portion is constant in a direction of a tubular axis of the first tubular portion; The outer diameter of the second tubular portion is constant in the direction of the tubular axis of the second tubular portion. The confluence joint of claim 1.

5. When viewed from the direction of the pipe axis of the second pipe portion, the fillet surrounds the second pipe portion. The confluence joint of claim 1.

6. When viewed from the direction of the tube axis of the second tube portion, the outer peripheral shape of the fillet is an elliptical shape whose major axis is in the direction of the tube axis of the first tube portion. The confluence joint of claim 5.

7. a thickness of the fillet in a plane including the tube axis of the first tube portion and the tube axis of the second tube portion is larger than a thickness of the fillet in a plane including the tube axis of the second tube portion and a direction perpendicular to the tube axis of the first tube portion and the tube axis of the second tube portion, respectively; The confluence joint of claim 5.

8. a radius of curvature of the surface of the fillet in a plane including the tube axis of the first pipe portion and the tube axis of the second pipe portion is smaller than a radius of curvature of the surface of the fillet in a plane including the tube axis of the second pipe portion and a direction perpendicular to the tube axis of the first pipe portion and the tube axis of the second pipe portion, The confluence joint of claim 5.

9. a first protrusion located between the second pipe portion and the second insertion port in the direction of the pipe axis of the first pipe portion and protruding from an inner circumferential surface of the first pipe portion toward the pipe axis of the first pipe portion; a second protruding portion protruding from a tip of the first protruding portion toward the second insertion port; Furthermore, a gap is formed between an inner circumferential surface of the first pipe portion and the second protrusion portion, into which an end of a pipe connected to the second insertion port is accommodated; The confluence joint of claim 1.

10. an inner circumferential surface of the first pipe portion including a slope portion between the first insertion port of the first pipe portion and the second pipe portion, in which an inner diameter of the first pipe portion decreases from the first insertion port toward the second pipe portion in a pipe axis direction of the first pipe portion; The confluence joint of claim 1.

11. an inner circumferential surface of the second pipe portion including an inclined portion in which an inner diameter of the second pipe portion decreases from the third insertion port toward the first pipe portion in a pipe axis direction of the second pipe portion; The confluence joint of claim 1.

12. a receiving portion protruding from a corner between the first insertion port and the third insertion port toward at least one of the tube axis side of the first pipe portion and the tube axis side of the second pipe portion, The confluence joint of claim 1.

13. a protrusion amount of the receiving portion toward the pipe axis side of the first pipe portion is equal to or less than twice the wall thickness of the pipe connected to the first insertion port; The confluence joint of claim 12.

14. a protrusion amount of the receiving portion toward the pipe axis side of the second pipe portion is equal to or less than twice the wall thickness of the pipe connected to the third insertion port; The confluence joint of claim 12.

15. The pipe diameter of the second pipe portion is smaller than the pipe diameter of the first pipe portion by one size or more. The confluence joint of claim 1.

16. A confluence joint according to any one of claims 1 to 15; a first pipe connected to the first insertion port; a second pipe connected to the second outlet; a third pipe connected to the third outlet; Equipped with Piping system.

Images