Elbow, piping system

Abstract

To provide an elbow and piping system that allows for a reduced likelihood of fluid and foreign matter retention. The elbow (5) comprises a first socket (51) having a first insertion port (51a), a second socket (52) having a second insertion port (52a), a curved pipe section (53) between the first socket (51) and the second socket (52), an inner cylindrical section (54) located within the second socket (52) and having the same central axis (C54) as the second socket (52), and an end (first end (54a)) of the inner cylindrical section (54) opposite the second insertion port (52a) connected to an inner peripheral surface (531) of the curved pipe section (53) around the entire circumference. The second insertion port 52a is provided with a connection portion 55, and a gap G is formed between the inner surface 521 of the second receiving port 52 and the outer surface 542 of the inner tube portion 54 to accommodate the end of the piping (horizontal pipes 6-1, 6-2) connected to the second insertion port 52a. The connection portion 55 has an inclined surface 551 in an outer region 55a on the outer periphery of the curved pipe portion 53 that connects the inner surface 531 of the curved pipe portion 53 and the inner surface 541 of the inner tube portion 54, and the gradient φ of the inclined surface 551 is 10° or less.

Description

[Technical Field]

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

[0002] Patent Document 1 discloses an elbow for connecting downspouts. The elbow disclosed in Patent Document 1 consists of an L-shaped inner pipe with a bent corner-shaped elbow shape without a radius at the bend, and a pair of I-shaped outer pipes, each with a receiving portion and an insertion portion, that are attached to both straight pipe portions of the L-shaped inner pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3200109 Summary of the Invention [Problem to be solved by the invention]

[0004] The elbow disclosed in Patent Document 1 can be connected by inserting a pipe such as a downspout into a receiving portion (receptacle). However, there is a possibility that fluid such as rainwater may remain between the inner circumferential surface of the receiving portion of the elbow and the outer circumferential surface of the pipe inserted into the receiving portion.

[0005] The present disclosure provides elbows and piping systems that allow for a reduced likelihood of fluid and foreign object retention. [Means for solving the problem]

[0006] An elbow according to one embodiment of the present disclosure comprises a first socket having a first insertion port, a second socket having a second insertion port, a curved pipe section between the first and second sockets, an inner tube section within the second socket and having the same central axis as the second insertion port, and a connecting section connecting the entire circumference of the end of the inner tube section opposite the second insertion port to the inner surface of the curved pipe section, wherein a gap is formed between the inner surface of the second socket and the outer surface of the inner tube section to accommodate the end of a pipe connected to the second insertion port, and the connecting section has an inclined surface at an outer portion on the outer periphery of the curved pipe section that connects the inner surface of the curved pipe section to the inner surface of the inner tube section, and the inclination of the inclined surface is 10° or less.

[0007] A piping system according to one aspect of the present disclosure includes the above elbow, a first pipe connected to the first outlet, and a second pipe connected to the second outlet. [Effects of the Invention]

[0008] Aspects of the present disclosure allow for a reduction in the likelihood of fluid and foreign matter retention. [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 elbow in a piping system according to an embodiment; [Figure 3] 1 is a perspective view of an elbow of a piping system according to an embodiment of the present invention; [Figure 4] View from the IV direction of Figure 3 [Figure 5] View from the V direction of Figure 3 [Figure 6] Cross section of line AA in Figure 4 [Figure 7] Cross section of line BB in Figure 4 [Figure 8] Cross section of line CC in Figure 5 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] Junction joint 3 connects branch pipe 11 to main pipe 10. Junction joint 3 has a first socket 3a facing upward, a second socket 3b facing downward, and a third socket 3c facing sideways. Junction joint 3 merges the fluid flowing in from first socket 3a with the fluid flowing in from third socket 3c, and causes the resulting fluid to flow out from second socket 3b.

[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 a flow path. The elbow 5 is a 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 51 and a second socket 52. The elbow 5 will be described in more detail later.

[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 and the horizontal pipe 6-1. The downstream end of the stand pipe 4-1 is connected to the first socket 51 of the elbow 5-1, and the upstream end of the horizontal pipe 6-1 is connected to the second socket 52 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 and the horizontal pipe 6-2. The downstream end of the stand pipe 4-2 is connected to the first socket 51 of the elbow 5-2, and the upstream end of the horizontal pipe 6-2 is connected to the second socket 52 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] 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, fluids such as rainwater and foreign matter such as soil may remain in the elbows 5-1 and 5-2 of the branch pipes 11-1 and 11-2. In this embodiment, the elbows 5-1 and 5-2 have a structure to reduce the possibility of fluids and foreign matter remaining.

[0028] The elbows 5-1 and 5-2 will be described in further detail below with reference to Figures 2 to 8. Since the elbows 5-1 and 5-2 have the same structure, in the following description, the elbows 5-1 and 5-2 will be referred to as elbow 5 without any distinction between them.

[0029] Fig. 2 is a cross-sectional view of a portion including an elbow 5 (elbow 5-1 in Fig. 2) in the piping system 1. Fig. 3 is a perspective view of the elbow 5, Fig. 4 is a view taken from direction IV in Fig. 3 (the direction of the central axis C51 of the first socket 51), Fig. 5 is a view taken from direction V in Fig. 3 (the direction of the central axis C52 of the second socket 52), Fig. 6 is a cross-sectional view taken along line AA in Fig. 4, Fig. 7 is a cross-sectional view taken along line BB in Fig. 4, and Fig. 8 is a cross-sectional view taken along line CC in Fig. 5.

[0030] As can be seen from FIGS. 2 and 3, the elbow 5 includes a first socket 51, a second socket 52, and a curved pipe portion 53 located between the first socket 51 and the second socket 52.

[0031] As shown in FIGS. 4 to 7, the first socket 51 is used to connect the first pipe (standpipes 4-1 and 4-2) upstream of the elbow 5 to the elbow 5. The first socket 51 has a straight pipe shape. The first socket 51 has an inner circumferential surface 511 and an outer circumferential surface 512. As shown in FIG. 4, the cross section of the first socket 51 perpendicular to the central axis C51 is circular. The outer diameter of the first socket 51 is constant in the direction of the central axis C51 of the first socket 51. As shown in FIGS. 3 and 6, the first socket 51 has a first insertion port 51a at the end opposite the curved pipe portion 53 in the direction of the central axis C51. In this embodiment, the first insertion port 51a is a circular opening. The inner diameter of the first insertion port 51a is larger than the outer diameter of the first pipe (standpipes 4-1 and 4-2) to be connected to the first socket 51. In this embodiment, the inner diameter of first insertion port 51a is set so as to accommodate a pipe having the same outer diameter.

[0032] The second socket 52 is used to connect the second pipe (horizontal pipes 6-1 and 6-2) downstream of the elbow 5 to the elbow 5. The second socket 52 has a straight pipe shape. The second socket 52 has an inner circumferential surface 521 and an outer circumferential surface 522. As shown in FIG. 5, the cross section of the second socket 52 perpendicular to the central axis C52 is circular. The outer diameter of the second socket 52 is constant in the direction of the central axis C52 of the second socket 52. As shown in FIGS. 3 and 6, the second socket 52 has a second insertion port 52a at the end opposite the curved pipe portion 53 in the direction of the central axis C52. In this embodiment, the second insertion port 52a is a circular opening. The inner diameter of the second insertion port 52a is larger than the outer diameter of the second pipe (horizontal pipes 6-1 and 6-2) to be connected to the second socket 52. In this embodiment, the inner diameter of second insertion port 52a is set to accommodate a pipe of the same outer diameter.

[0033] 6, the central axis C52 of the second socket 52 intersects with the central axis C51 of the first socket 51. The angle θ between the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52 is equal to or greater than 91° and equal to or less than 135°. In this embodiment, θ1 is, for example, 91.17° as defined in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage."

[0034] The sizes (particularly, outer diameter, thickness, inner diameter, etc.) of the first socket 51 and the second socket 52 may be set appropriately according to the size of the pipe to be connected to the elbow 5. The size of the pipe can be expressed in nominal diameter. The nominal diameter may be, for example, the nominal diameter in the standard for rigid polyvinyl chloride pipes (general) specified in JIS K 6741 "Rigid polyvinyl chloride pipes."

[0035] 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.

[0036] [Table 1]

[0037] 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.

[0038] [Table 2]

[0039] As an example, the outer diameters of first socket 51 and second socket 52 may be 60 mm to 140 mm (i.e., VU50 to VU125). In this embodiment, the outer diameters of first socket 51 and second socket 52 are equal to each other, but they may also be different from each other. The pipe diameter size of first socket 51 and second socket 52 may be the nominal diameter described above, or may be a size set by a manufacturer selling piping, etc., and examples include 60 mm, 76 mm, 89 mm, 114 mm, and 140 mm.

[0040] The curved pipe portion 53 connects the first socket 51 and the second socket 52. In this embodiment, the curved pipe portion 53 connects the first socket 51 and the second socket 52 together in a continuous, integrated manner. The internal space of the second socket 52 and the internal space of the first socket 51 are connected via the internal space of the curved pipe portion 53.

[0041] The curved pipe portion 53 has a shape like a straight pipe bent at a right angle, and has an inner circumferential surface 531 and an outer circumferential surface 532 .

[0042] The inner peripheral surface 531 is connected to the inner peripheral surface 511 of the first socket 51 and the inner peripheral surface of the second socket 52 .

[0043] The outer peripheral surface 532 is connected to the inner peripheral surface 511 of the first socket 51 and the inner peripheral surface of the second socket 52. As shown in FIG. 3 , the outer peripheral surface 532 includes a first surface 532a that is seamlessly connected to the outer peripheral surface 512 of the first socket 51 and a second surface 532b that is seamlessly connected to the outer peripheral surface 512 of the second socket 52. The outer peripheral surface 532 further includes an inner fillet 532c located between the first surface 532a and the second surface 532b on the inner peripheral side of the curved pipe portion 53, and an outer fillet 532d located between the first surface 532a and the second surface 532b on the outer peripheral side of the curved pipe portion 53. The surface of the inner fillet 532c is concave. The surface of the outer fillet 532d is convex. The presence of the inner fillet 532c and the outer fillet 532d can reduce stress concentration in the curved pipe portion 53 compared to a case in which the inner fillet 532c and the outer fillet 532d are not present, thereby enabling the strength of the elbow 5 to be improved.

[0044] The outer circumferential surface 532 of the curved pipe portion 53 is connected without any step to the outer circumferential surface 512 of the first socket 51 and the outer circumferential surface 522 of the second socket 52, so that the elbow 5 can have a sharp appearance.

[0045] As shown in FIGS. 6 and 7 , the inner diameter of the first socket 51 is not constant in the direction of the central axis C51 of the first socket 51. The inner circumferential surface 511 of the first socket 51 includes a sloped portion 511a where the inner diameter of the first socket 51 decreases from the first insertion port 51a toward the curved pipe portion 53 in the direction of the central axis C51 of the first socket 51. The sloped portion 511a comes into contact with the pipes (standpipes 4-1 and 4-2) inserted into the first socket 51 from the first insertion port 51a, stabilizing the connection of the pipes to the first socket 51. In other words, this configuration improves the stability of the connection to the first insertion port 51a. Here, the inner diameter of the first socket 51 at the sloped portion 511a is preferably larger than the inner diameter of the pipes (standpipes 4-1 and 4-2) inserted into the first socket 51 from the first insertion port 51a. This makes it possible to ignore the influence of inclined portion 511a on the flow path of the pipe inserted from first insertion port 51a into first socket 51.

[0046] 6, the elbow 5 has a structure for reducing the possibility of fluid and foreign matter remaining therein, which includes an inner cylindrical portion 54 and a connecting portion 55. In this embodiment, the inner cylindrical portion 54 and the connecting portion 55 are formed integrally and continuously with the curved pipe portion 53.

[0047] As shown in FIGS. 5, 6, and 8, the inner cylindrical portion 54 has a straight pipe shape. The inner cylindrical portion 54 has an inner circumferential surface 541 and an outer circumferential surface 542. As shown in FIG. 5, a cross section of the inner cylindrical portion 54 perpendicular to the central axis C54 is circular. The outer diameter and inner diameter of the inner cylindrical portion 54 are substantially constant in the direction of the central axis C54 of the inner cylindrical portion 54. The inner cylindrical portion 54 has a first end 54a and a second end 54b. The first end 54a is the end of the inner cylindrical portion 54 opposite the second insertion port 52a (the upstream end). The second end 54b is the end of the inner cylindrical portion 54 on the second insertion port 52a side (the downstream end). The thickness of the inner cylindrical portion 54 is smaller than the thickness of the second receiving port 51. This can prevent the inner cylindrical portion 54 from reducing the cross-sectional area of ​​the flow path, thereby reducing the effect of the inner cylindrical portion 54 on the flow path.

[0048] The inner cylindrical portion 54 is disposed within the second socket 52 such that the central axis C54 of the inner cylindrical portion 54 coincides with the central axis C52 of the second socket 52. A gap G is formed between the inner peripheral surface 521 of the second socket 52 and the outer peripheral surface 542 of the inner cylindrical portion 54, allowing the end of the piping (horizontal pipes 6-1, 6-2) connected to the second insertion port 52a to fit therein. The length of the inner cylindrical portion 54 is set so that the end (second end 54b) of the inner cylindrical portion 54 on the second insertion port 52a side is closer to the curved pipe portion 53 than the second insertion port 52a. In other words, the inner cylindrical portion 54 does not extend beyond the second insertion port 52a. This reduces the extent to which the cross-sectional area of ​​the flow path is reduced by the inner cylindrical portion 54, thereby reducing the effect of the inner cylindrical portion 54 on the flow path.

[0049] An annular gap G exists between inner circumferential surface 521 of second socket 52 and outer circumferential surface 542 of inner cylindrical portion 54. As shown in Fig. 2, an end of a pipe (horizontal pipes 6-1, 6-2) connected to second socket 52 is inserted into gap G. In other words, gap G is formed between inner circumferential surface 521 of second socket 52 and inner cylindrical portion 54, and the end of the pipe (horizontal pipes 6-1, 6-2) connected to second socket 52 fits therein.

[0050] 6 to 8, the connecting portion 55 connects the inner cylindrical portion 54 to the curved pipe portion 53. In this embodiment, the connecting portion 55 connects the entire circumference of the end (first end 54a) of the inner cylindrical portion 54 opposite to the second insertion port 52a to the inner circumferential surface 531 of the curved pipe portion 53. As shown in FIG. 7, the connecting portion 55 is formed around the entire circumference of the inner circumferential surface 531 of the curved pipe portion 53 when viewed from the direction of the central axis C52 of the second socket 52.

[0051] In the elbow 5, because fluid is discharged from the second insertion port 52a, rainwater or the like may enter the gap between the second socket 52 and the piping, causing water to accumulate. If the water accumulated in the gap freezes, it may cause damage to the elbow 5 or the piping. Furthermore, water accumulated in the gap may increase the risk of water leakage due to poor adhesion between the elbow 5 and the piping. However, the elbow 5 includes the inner cylindrical portion 54 and the connecting portion 55, which cover the gap between the inner circumferential surface 521 of the second socket 52 and the piping inserted into the second socket 52 from the second insertion port 52a. This reduces the possibility of rainwater or the like entering the gap between the second socket 52 and the piping, causing water to accumulate.

[0052] Since the elbow 5 includes the inner cylindrical portion 54 and the connecting portion 55, there is a possibility that foreign matter such as soil may accumulate at the boundary between the inner circumferential surface 531 of the curved pipe portion 53 and the connecting portion 55.

[0053] As shown in FIG. 7, the connecting portion 55 has an inclined surface 551 to prevent foreign matter from accumulating. The inclined surface 551 is located on an outer portion 55a of the connecting portion 55. The outer portion 55a is the portion of the connecting portion 55 on the outer peripheral side of the curved pipe portion 53. The inclined surface 551 connects the inner peripheral surface 531 of the curved pipe portion 53 with the inner peripheral surface 541 of the inner cylindrical portion 54. The inclined surface 551 guides foreign matter such as soil from the curved pipe portion 53 to the inner cylindrical portion 54, thereby increasing the possibility that the foreign matter will be discharged from the second insertion port 52a to the outside of the elbow 5.

[0054] 6, the inclined surface 551 has a gradient φ. The gradient φ is the angle of the inclined surface 551 with respect to the inner circumferential surface 531 of the curved pipe portion 53 in a plane including the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52. In this embodiment, if the gradient φ is 10° or less, the possibility of foreign matter being discharged from the second insertion port 52a to the outside of the elbow 5 can be increased. Note that, due to the positional relationship between the curved pipe portion 53 and the inner cylindrical portion 54, the gradient φ does not become 0° or less.

[0055] 7, when viewed from the direction of central axis C52 of second receiving port 52, inclined surface 551 has a concave shape with both sides protruding outward from the center. This makes it possible to reduce the range in which the cross-sectional area of ​​the flow path is reduced by connecting portion 55, and to reduce the effect of connecting portion 55 on the flow path.

[0056] The inclined surface 551 has a first end 551a and a second end 551b. The first end 551a is the end of the inclined surface 551 on the curved pipe portion 53 side (the upstream end). The second end 551b is the end of the inclined surface 551 on the inner cylindrical portion 54 side (the downstream end).

[0057] 8, when viewed from the direction of the central axis C51 of the first socket 51, the width of the inclined surface 551 decreases from the first end 551a toward the second end 551b. Here, if the minimum width of the inclined surface 551 is W, it is preferable that W be 20 mm or more. If W is 20 mm or more, foreign matter such as soil can easily move from the inclined surface 551 to the inner circumferential surface 541 of the inner cylindrical portion 54. This further increases the likelihood that foreign matter will be discharged from the second insertion port 52a to the outside of the elbow 5.

[0058] As shown in Fig. 8, when viewed from the direction of central axis C51 of first socket 51, first end 551a is fan-shaped with the center protruding outward from both sides. In the present embodiment, as shown in Fig. 6, in the direction of central axis C52 of second socket 52, first end 551a of inclined surface 551 is located closer to second insertion port 52a than central axis C51 of first socket 51. This makes it possible to reduce the range in which the cross-sectional area of ​​the flow path is reduced by connecting portion 55, and to reduce the effect of connecting portion 55 on the flow path.

[0059] As shown in FIG. 8, the second end 551b is linear when viewed from the direction of the central axis C51 of the first socket 51. Here, the position of the second end 551b is determined based on the inner portion 55b of the connecting portion 55. The inner portion 55b is a portion of the connecting portion 55 on the inner circumferential side of the curved pipe portion 53. In this embodiment, as shown in FIG. 6, in a plane including the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52, the angle ψ of the second line L2 connecting the second end 551b of the inclined surface 551 and the inner portion 55b with respect to the first line L1 perpendicular to the central axis C52 of the second socket 52 is between 0° and 40°. This further reduces the possibility of fluid and foreign matter remaining.

[0060] 6, in this embodiment, inner portion 55b protrudes from inner circumferential surface 531 of curved pipe portion 53 toward central axis C52 of second socket 52 so as to be perpendicular to central axis C52 of second socket 52. This allows inner cylinder portion 54 to be brought closer to curved pipe portion 53, and there is no need to lengthen second socket 52 in order to provide inner cylinder portion 54.

[0061] 6, in the present embodiment, inner portion 55b is located at a corner on the inner circumferential side of inner circumferential surface 531 of curved pipe portion 53. As a result, inner portion 55b has receiving surface 552 facing first insertion port 51a, as shown in FIGS.

[0062] The receiving surface 552 contacts the pipe (standpipe 4-1, 4-2) inserted from the first insertion port 51a into the first socket 51, stabilizing the connection of the pipe to the first socket 51. This improves the stability of the connection to the first insertion port 51a. In particular, the receiving surface 552 is located at a position corresponding to the inclined portion 511a in the direction of the central axis C51 of the first socket 51. This allows the receiving surface 552 and the inclined portion 511a to cooperate to stabilize the connection of the pipe to the first socket 51. The amount of protrusion of the inner portion 55b toward the central axis C51 of the first socket 51 is no more than twice the thickness of the pipe (standpipe 4-1, 4-2) connected to the first insertion port 51a. The thickness of the pipe is the difference between the outer radius and the inner radius of the pipe. This reduces the possibility that the inner portion 55b will protrude into the inside of the pipe. Therefore, the influence of connecting portion 55 on the flow path of the pipe connected to first insertion port 51a can be ignored.

[0063] If the amount of protrusion of connection portion 55 from inner circumferential surface 531 of curved pipe portion 53 toward central axis C52 of second socket 52 increases, connection portion 55 is more likely to cause pressure loss in the flow path from curved pipe portion 53 to second socket 52. For this reason, the amount of protrusion of connection portion 55 from inner circumferential surface 531 of curved pipe portion 53 toward central axis C52 of second socket 52 is set to an amount that does not substantially cause pressure loss or is negligible compared to a state in which a pipe is connected to second socket 52 of elbow 5.

[0064] In the elbow 5 described above, the first socket 51, the second socket 52, the curved pipe portion 53, the inner cylindrical portion 54, and the connecting portion 55 may be formed as a continuous, integrated unit. For example, the material of the elbow 5 may be rigid polyvinyl chloride. The elbow 5 may be formed by injection molding or the like using a mold. In this case, the mold may include a first mold for defining the internal and external shapes of the elbow 5 from the first insertion port 51a side and a second mold for defining the internal and external shapes of the elbow 5 from the second insertion port 52a side. In this case, in a plane including the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52, if the angle ψ of the second straight line L2 connecting the second end 551b of the inclined surface 551 and the inner portion 55b with the first straight line L1 perpendicular to the central axis C52 of the second socket 52 is between 5° and 40°, the first mold can be easily removed.

[0065] [1.2 Effects, etc.] The elbow 5 described above includes a first socket 51 having a first insertion port 51a, a second socket 52 having a second insertion port 52a, a curved pipe portion 53 between the first socket 51 and the second socket 52, an inner cylindrical portion 54 located in the second socket 52 and having the same central axis C54 as the second socket 52, and a connector connecting the entire circumference of the end (first end 54a) of the inner cylindrical portion 54 opposite to the second insertion port 52a to an inner peripheral surface 531 of the curved pipe portion 53. The second insertion port 52a includes a connecting portion 55, and a gap G is formed between the inner peripheral surface 521 of the second socket 52 and the outer peripheral surface 542 of the inner cylindrical portion 54 to accommodate the end of the pipe (horizontal pipes 6-1, 6-2) connected to the second insertion port 52a. The connecting portion 55 has an inclined surface 551 at an outer portion 55a on the outer periphery of the curved pipe portion 53 that connects the inner peripheral surface 531 of the curved pipe portion 53 to the inner peripheral surface 541 of the inner cylindrical portion 54. The inclination φ of the inclined surface 551 is 10° or less. This configuration reduces the possibility of fluid and foreign matter remaining. Furthermore, it improves the stability of the connection to the second socket 52.

[0066] In the elbow 5, the minimum width W of the inclined surface 551 is 20 mm or more. This configuration makes it possible to further reduce the possibility of fluid and foreign matter remaining.

[0067] In the elbow 5, the angle θ between the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52 is equal to or greater than 91° and equal to or less than 135°. This configuration makes it possible to reduce the possibility of fluid and foreign matter remaining.

[0068] In the elbow 5, the connecting portion 55 has an inner portion 55b on the inner circumferential side of the curved pipe portion 53, and the inner portion 55b protrudes from the inner circumferential surface 531 of the curved pipe portion 53 toward the central axis C52 of the second socket 52 so as to be perpendicular to the central axis C52 of the second socket 52. This configuration allows the inner cylindrical portion 54 to be closer to the curved pipe portion 53, and it is not necessary to lengthen the second socket 52 to accommodate the inner cylindrical portion 54.

[0069] In the elbow 5, in a plane including the central axis C51 of the first socket 51 and the central axis C52 of the second socket 52, the angle ψ of a second straight line L2 connecting the end of the inclined surface 551 on the inner cylindrical portion side (second end 551b) and the inner portion 55b with respect to a first straight line L1 perpendicular to the central axis C52 of the second socket 52 is not less than 0° and not more than 40°. This configuration makes it possible to further reduce the possibility of fluids and foreign matter remaining.

[0070] In the elbow 5, in the direction of the central axis C52 of the second socket 52, the end (first end 551a) of the inclined surface 551 on the curved pipe portion 53 side is located closer to the second insertion port than the central axis C51 of the first socket 51. This configuration makes it possible to further reduce the possibility of fluid and foreign matter remaining.

[0071] In the elbow 5, the end (second end 54b) of the inner cylindrical portion 54 on the second insertion port 52a side is located closer to the curved pipe portion 53 than the second insertion port 52a. This configuration can reduce the influence of the inner cylindrical portion on the flow path.

[0072] In the elbow 5, the thickness of the inner cylindrical portion 54 is smaller than the thickness of the second socket 51. This configuration can reduce the influence of the inner cylindrical portion on the flow path.

[0073] In the elbow 5, the inner peripheral surface 511 of the first socket 51 includes a sloped portion 511a in which the inner diameter of the first socket 51 decreases from the first insertion port 51a toward the curved pipe portion 53 in the direction of the central axis C51 of the first socket 51. This configuration enables improved stability of connection to the first socket 51.

[0074] The piping system described above includes the elbow 5, the first pipe (vertical pipes 4-1 and 4-2) connected to the first socket 51a, and the second pipe (horizontal pipes 6-1 and 6-2) connected to the second socket 52a. This configuration reduces the possibility of fluid and foreign matter remaining. Furthermore, it improves the stability of the connection to the second socket 52.

[0075] [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.

[0076] In one variant, the material of the elbow 5 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.

[0077] In one variation, the shape and size of part or all of the elbow 5 may be different from those in the above embodiment. For example, unlike the above embodiment, the shape of the first socket 51 and the second socket 52 may be polygonal rather than circular.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] [3. Aspects] As is apparent from the above-described embodiment and modifications, the present disclosure includes the following aspects.

[0082] [Aspect 1] a first socket having a first insertion port; a second socket having a second insertion port; a curved pipe portion between the first socket and the second socket; an inner cylindrical portion disposed within the second socket and having a central axis coinciding with a central axis of the second socket; a connecting portion that connects the entire circumference of the end of the inner cylindrical portion opposite to the second insertion port to the inner circumferential surface of the curved pipe portion; Equipped with a gap is formed between an inner peripheral surface of the second socket and an outer peripheral surface of the inner cylindrical portion, and an end of a pipe to be connected to the second socket is accommodated therein; the connecting portion has an inclined surface at an outer portion on the outer circumferential side of the curved pipe portion, the inclined surface connecting the inner circumferential surface of the curved pipe portion and the inner circumferential surface of the inner cylindrical portion, The gradient of the inclined surface is 10° or less. Elbow.

[0083] [Aspect 2] The minimum width of the inclined surface is 20 mm or more. Elbow of embodiment 1.

[0084] [Aspect 3] The angle between the central axis of the first socket and the central axis of the second socket is greater than or equal to 91° and less than or equal to 135°. The elbow of embodiment 1 or 2.

[0085] [Aspect 4] the connecting portion has an inner portion on an inner circumferential side of the curved pipe portion, The inner portion protrudes from the inner peripheral surface of the curved pipe portion toward the central axis of the second socket so as to be perpendicular to the central axis of the second socket. The elbow of any one of embodiments 1 to 3.

[0086] [Aspect 5] In a plane including the central axis of the first socket and the central axis of the second socket, an angle of a second line connecting the end of the inclined surface on the inner tube side and the inner portion with respect to a first line perpendicular to the central axis of the second socket is greater than or equal to 0° and less than or equal to 40°. Elbow of embodiment 4.

[0087] [Aspect 6] In the direction of the central axis of the second socket, the end of the inclined surface on the curved pipe portion side is located closer to the second insertion port than the central axis of the first socket. The elbow of any one of embodiments 1 to 5.

[0088] [Aspect 7] The end of the inner cylindrical portion on the second insertion port side is located closer to the curved pipe portion than the second insertion port. The elbow of any one of embodiments 1 to 6.

[0089] [Aspect 8] The wall thickness of the inner cylindrical portion is smaller than the wall thickness of the second socket. The elbow of any one of embodiments 1 to 7.

[0090] [Aspect 9] The inner peripheral surface of the first socket includes a sloped portion in which the inner diameter of the first socket decreases from the first insertion port toward the curved pipe portion in the direction of the central axis of the first socket. The elbow of any one of embodiments 1 to 8.

[0091] [Aspect 10] An elbow according to any one of aspects 1 to 9; a first pipe connected to the first outlet; A second pipe connected to the second outlet; Equipped with Piping system.

[0092] [Aspect 11] a first socket having a first insertion port; a second socket having a second insertion port; a curved pipe portion between the first socket and the second socket; an inner cylindrical portion disposed within the second socket and having a central axis coinciding with a central axis of the second socket; a connecting portion that connects the entire circumference of the end of the inner cylindrical portion opposite to the second insertion port to the inner circumferential surface of the curved pipe portion; Equipped with a gap is formed between an inner peripheral surface of the second socket and an outer peripheral surface of the inner cylindrical portion, and an end of a pipe to be connected to the second socket is accommodated therein; The connecting portion has an inclined surface at an outer portion on the outer circumferential side of the curved pipe portion, the inclined surface connecting the inner circumferential surface of the curved pipe portion and the inner circumferential surface of the inner cylindrical portion.

[0093] [Aspect 12] In a plane including the central axis of the first socket and the central axis of the second socket, an angle of a second line connecting the end of the inclined surface on the inner tube side and the inner portion with respect to a first line perpendicular to the central axis of the second socket is 5° or more and 40° or less. Elbow of embodiment 4.

[0094] Aspects 2 to 9 and 12 are optional elements and are not essential. [Industrial Applicability]

[0095] The present disclosure is applicable to elbows and piping systems, particularly to elbows for connecting flow paths with different directions, and to piping systems including such elbows. [Explanation of symbols]

[0096] 1 Piping System 4, 4-1, 4-2 Vertical pipe (first piping) 5,5-1,5-2 Elbow 51 First socket 51 51a 1st outlet 511 Inner surface 511a Slope C51 center axis 52 Second socket 52 52a Second outlet 521 Inner surface 522 Outer surface C52 center axis 53 Bent pipe section 531 Inner surface 54 Inner cylinder 54a First end (the end of the inner tube opposite to the second insertion port) 54b Second end (end of the inner cylinder portion on the second insertion port side) 541 Inner surface 542 Outer surface C54 center axis 55 Connection 55a External part 55b Medial part 551 Slope 551a First end (end of the inclined surface on the curved pipe side) 551b Second end (end of the inclined surface on the inner cylinder side) G Gap 6, 6-1, 6-2 Horizontal pipe (second piping) L1 1st straight line L2 2nd straight line θ angle φ gradient ψ angle

Claims

1. a first receptacle having a first insertion port; a second receptacle having a second insertion port; a curved pipe portion between the first socket and the second socket; an inner cylindrical portion disposed within the second socket and having a central axis coinciding with a central axis of the second socket; a connecting portion that connects the entire circumference of the end of the inner cylindrical portion opposite to the second insertion port to the inner peripheral surface of the curved pipe portion; Equipped with a gap is formed between an inner peripheral surface of the second socket and an outer peripheral surface of the inner cylindrical portion, and an end of a pipe connected to the second socket is accommodated therein; the connecting portion has an inclined surface at an outer portion on the outer circumferential side of the curved pipe portion, the inclined surface connecting the inner circumferential surface of the curved pipe portion and the inner circumferential surface of the inner cylindrical portion, The gradient of the inclined surface is 10° or less. Elbow.

2. The minimum width of the inclined surface is 20 mm or more. The elbow of claim 1.

3. The angle between the central axis of the first socket and the central axis of the second socket is greater than or equal to 91° and less than or equal to 135°. The elbow of claim 1.

4. the connecting portion has an inner portion on an inner circumferential side of the curved pipe portion, The inner portion protrudes from the inner peripheral surface of the curved pipe portion toward the central axis of the second socket so as to be perpendicular to the central axis of the second socket. The elbow of claim 1.

5. In a plane including the central axis of the first socket and the central axis of the second socket, an angle of a second line connecting the end of the inclined surface on the inner tube portion side and the inner portion with respect to a first line perpendicular to the central axis of the second socket is greater than or equal to 0° and less than or equal to 40°. The elbow of claim 4.

6. In the direction of the central axis of the second socket, the end of the inclined surface on the curved pipe portion side is located closer to the second insertion port than the central axis of the first socket. The elbow of claim 1.

7. an end of the inner cylindrical portion on the second insertion port side is located closer to the curved pipe portion than the second insertion port; The elbow of claim 1.

8. The wall thickness of the inner cylindrical portion is smaller than the wall thickness of the second socket. The elbow of claim 1.

9. an inner peripheral surface of the first socket including a sloped portion in which an inner diameter of the first socket decreases from the first insertion port toward the curved pipe portion in a direction of a central axis of the first socket; The elbow of claim 1.

10. An elbow according to any one of claims 1 to 9; a first pipe connected to the first insertion port; a second pipe connected to the second outlet; Equipped with Piping system.

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