Drainage components and drainage systems

Abstract

To provide a drainage member and a drainage system capable of improving drainage capacity while enabling miniaturization.SOLUTION: A drainage member 5 constitutes a part of a drainage system having a vertical pipe 3 and a horizontal pipe 4. The drainage member 5 has a first opening 5a directed to the upstream side of the drainage system, a second opening 5b directed to the downstream side of the drainage system, and a bent flow passage 5c connecting the first opening 5a and the second opening 5b so that central axes C1, C2 of the first opening 5a and the second opening 5b intersect with each other. A first wall surface 50b on the inner peripheral side of the bent flow passage 5c protrudes toward a second wall surface 50c on the outer peripheral side of the bent flow passage 5c so that a reduced part 5c1, where the cross-sectional area of the bent flow passage 5c becomes smaller than the cross-sectional area of the second opening 5b, is located between an angle 5d on the inner peripheral side of the bent flow passage 5c and the second opening 5b. When the diameter of the second opening 5b is d and the length of the reduced part 5c1 in the direction of the central axis C2 of the second opening 5b is L, 0.5d≤L≤5.0d is satisfied.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present disclosure relates to a drainage member and a drainage system.

Background Art

[0002] Patent Document 1 discloses a siphon rain gutter system. The siphon rain gutter system disclosed in Patent Document 1 includes an eaves gutter, a siphon generating part that has a cylindrical portion penetrating a water collection opening formed in the bottom surface of the eaves gutter and is configured to generate a siphon phenomenon, and an elbow. The elbow is disposed on the downstream side of the siphon rain gutter system. The elbow includes a bent pipe portion and sockets provided at both ends of the bent pipe portion. In the bent pipe portion when viewed in a cross section on a plane including the pipe axis of the bent pipe portion, the radius of curvature of the inner wall surface on the inner peripheral side is larger than 64 mm and smaller than 100 mm.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In the technique disclosed in Patent Document 1, although improvement of drainage capacity can be expected, the elbow becomes relatively large.

[0005] The present disclosure provides a drainage member and a drainage system that can improve drainage capacity while enabling downsizing.

Means for Solving the Problem

[0006] A drainage member according to one aspect of the present disclosure is a drainage member that constitutes part of a drainage system having vertical and horizontal pipes, and has a first opening directed toward the upstream side of the drainage system, a second opening directed toward the downstream side of the drainage system, and a bent flow path connecting the first opening and the second opening such that their central axes intersect. The first wall surface on the inner side of the bent flow path protrudes toward the second wall surface on the outer side of the bent flow path such that a narrowing portion exists between the inner corner of the bent flow path and the second opening, where the cross-sectional area of ​​the bent flow path is smaller than the cross-sectional area of ​​the second opening. If the diameter of the second opening is d and the length of the narrowing portion in the direction of the central axis of the second opening is L, then 0.5d ≤ L ≤ 5.0d.

[0007] A drainage member according to one aspect of the present disclosure is a drainage member that constitutes part of a drainage system having vertical pipes and horizontal pipes, and has a first opening directed toward the upstream side of the drainage system, a second opening directed toward the downstream side of the drainage system, and a bent flow path connecting the first opening and the second opening such that their central axes intersect. The first wall surface on the inner circumference side of the bent flow path has a shape that protrudes toward the second wall surface on the outer circumference side of the bent flow path so as to produce a Coanda effect between the inner circumference corner of the bent flow path and the second opening.

[0008] A drainage system according to one aspect of the present disclosure comprises the above-described drainage member, a horizontal pipe, and a vertical pipe. The horizontal pipe is connected to a first opening of the drainage member, and the vertical pipe is connected to a second opening of the drainage member. [Effects of the Invention]

[0009] The aspects of this disclosure enable miniaturization while improving drainage capacity. [Brief explanation of the drawing]

[0010] [Figure 1] Schematic diagram of an example of a drainage system configuration according to one embodiment. [Figure 2] Perspective view of an example of the configuration of drainage components in a rain gutter system (Figure 1) [Figure 3] Figure 2: Exploded perspective view of the drainage component. [Figure 4]Cross-sectional view of the drainage member in Fig. 2 [Figure 5] Exploded cross-sectional view of the drainage member in Fig. 2 [Figure 6] Cross-sectional view taken along line A-A in Fig. 4 [Figure 7] Perspective view of a configuration example of the straight pipe portion of the drainage member in Fig. 2 [Figure 8] Side view of the straight pipe portion in Fig. 7 [Figure 9] Plan view of the straight pipe portion in Fig. 7 [Figure 10] Bottom view of the straight pipe portion in Fig. 7 [Figure 11] Cross-sectional view taken along line B-B in Fig. 9 [Figure 12] Perspective cross-sectional view taken along line C-C in Fig. 9 [Figure 13] Cross-sectional view taken along line D-D in Fig. 11 [Figure 14] Diagram of pressure distribution simulation for the drainage member of the comparative example [Modes for Carrying Out the Invention]

[0011] Hereinafter, embodiments will be described in detail with appropriate reference to the drawings. However, unnecessarily detailed descriptions may be omitted in some cases. For example, detailed descriptions of well-known matters and redundant descriptions of substantially identical configurations may be omitted. This is to avoid making the following description unnecessarily redundant and to facilitate understanding by those skilled in the art. It should be noted that the inventors provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and do not intend to limit the subject matter recited in the claims by these.

[0012] Unless otherwise specified, positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Each drawing described in the following embodiments is a schematic diagram, and the ratios of the size and thickness of each component in each drawing do not necessarily reflect the actual dimensional ratios. In addition, the dimensional ratios of each element are not limited to the ratios illustrated in the drawings.

[0013] [1. Embodiment] [1.1 Configuration] Figure 1 is a schematic diagram illustrating a configuration example of a drainage system 1 according to Embodiment 1. The drainage system 1 is a rain gutter system that receives rainwater from a roof 11a of a building 11 and directs it to a catch basin 21 in the ground 20. The drainage system 1 constitutes a flow path for rainwater. The rainwater collected in the catch basin 21 flows out from the catch basin 21 through a buried pipe 22 to a rainwater pipe. The building 11 is, for example, a building of non-residential facilities such as stores, offices, factories, buildings, schools, welfare facilities or hospitals, and a building of residential facilities such as detached houses, collective housing, or individual dwelling units of detached houses or collective housing. Non-residential facilities also include theaters, cinemas, public halls, game halls, complex facilities, department stores, hotels, inns, kindergartens, libraries, museums, art museums, underground malls, stations, airports and the like.

[0014] The drainage system 1 of Figure 1 includes an eaves gutter 2, a vertical pipe 3, a horizontal pipe 4, a drainage member 5, an elbow 6, a drain 7, and a vertical pipe 8.

[0015] The eaves gutter 2 receives rainwater from the roof 11a of the building 11. The eaves gutter 2 is installed below the roof 11a of the building 11. As an example, the eaves gutter 2 is disposed at the eaves edge of the roof 11a. In particular, the eaves gutter 2 is disposed so as to extend along the eaves edge of the roof 11a. The eaves gutter 2 in Figure 1 has an elongated trough shape. The eaves gutter 2 in Figure 1 has a bottom wall 2a. A water collection port 2b is formed in the bottom wall 2a according to the overall design of the drainage system 1. The water collection port 2b is, for example, a circular opening. The water collection port 2b is also referred to as a drainage port or a drop port. As an example, the eaves gutter 2 may be formed by extrusion molding of a resin material. The eaves gutter 2 may be provided with a core material for reinforcing the strength of the entire eaves gutter 2. The core material may be made of metal, for example. As another example, the eaves gutter 2 may be formed of a metal plate, for example, a steel plate (also called a coil).

[0016] The drain 7 is disposed at the water collection port 2b of the eaves gutter 2. The drain 7 reduces the generation of vortices and the entrainment of air at the water collection port 2b. The drain 7 can contribute to the occurrence of a siphon phenomenon. The drain 7 may have a well-known configuration.

[0017] The vertical pipe 3 defines the vertical drainage path. In a rain gutter system, the vertical pipe 3 is also called a downpipe. In this embodiment, the vertical pipe 3 is installed to drain rainwater from the water collection port 2b. The vertical pipe 3 allows rainwater from the water collection port 2b to flow vertically. The vertical pipe 3 is straight. The cross-section perpendicular to the pipe axis of the vertical pipe 3 is circular. The vertical pipe 3 is positioned so that the direction of its pipe axis coincides with the vertical direction. In Figure 1, the vertical pipe 3 is fixed to the wall surface 11b of the building 11 by bracing fittings 30a, 30b, and 30c. The vertical pipe 3 has an upstream end 3a and a downstream end 3b. The upstream end 3a is the end of the vertical pipe 3 that is connected to the water collection port 2b (the upper end in Figure 1). The downstream end 3b is the end of the vertical pipe 3 that is inserted into the manhole 21 (the lower end in Figure 1). In Figure 1, a drain pipe cover 31 is positioned to prevent rainwater from flowing into the manhole 21 through the gap between the vertical pipe 3 and the manhole 21. As an example, the material of the vertical pipe 3 is rigid polyvinyl chloride. The dimensions of the vertical pipe 3, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipe".

[0018] The building 11 in Figure 1 has relatively long eaves. In building 11, if the vertical pipe 3 is directly connected to the water collection port 2b, the distance between the vertical pipe 3 and the wall surface 11b of building 11 becomes large, which may cause the vertical pipe 3 to fail to meet construction standards. Therefore, in the drainage system 1, the vertical pipe 3 is not directly connected to the water collection port 2b, but is connected to the water collection port 2b via the horizontal pipe 4, drainage member 5, and elbow 6. Thus, the drainage system 1 has a structure that is more suitable for buildings 11 with long eaves.

[0019] The horizontal pipe 4 defines a drainage path that intersects the vertical direction. In a rain gutter system, the horizontal pipe 4 is also called a connecting pipe. In this embodiment, the horizontal pipe 4 is the part that carries rainwater from the building 11 from the collection port 2b to the vertical pipe 3. The horizontal pipe 4 is located between the rainwater collection port 2b and the vertical pipe 3. The horizontal pipe 4 is straight. The cross-section of the horizontal pipe 4 perpendicular to its axis is circular. In Figure 1, the horizontal pipe 4 is fixed so that the direction of its axis is inclined with respect to the up and down direction (vertical direction). The horizontal pipe 4 has an upstream end 4a and a downstream end 4b. The upstream end 4a is the end of the horizontal pipe 4 that connects to the collection port 2b (the upper end in Figure 1). The downstream end 4b is the end of the horizontal pipe 4 that connects to the vertical pipe 3 (the lower end in Figure 1). As an example, the material of the horizontal pipe 4 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 4, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) in JIS K 6741 "Rigid polyvinyl chloride pipes".

[0020] The elbow 6 is a connecting fitting that connects drainage routes with different directions, such as vertical and horizontal pipes. In Figure 1, the elbow 6 connects the upstream end 4a of the horizontal pipe 4 to the water collection port 2b. The elbow 6 is not necessarily a component that directly connects the upstream end 4a of the horizontal pipe 4 to the water collection port 2b, but may be a component that indirectly connects the upstream end 4a of the horizontal pipe 4 to the water collection port 2b via another component. The elbow 6 has first and second sockets 6a and 6b for connecting piping components such as the vertical pipe 3 and the horizontal pipe 4 to the elbow 6, and a bend 6c that connects the first and second sockets 6a and 6b. In Figure 1, the first socket 6a receives the vertical pipe 8, and the second socket 6b receives the horizontal pipe 4. The angle between the central axes of the first and second sockets 6a and 6b is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage". For example, the material of elbow 6 may be rigid polyvinyl chloride. The dimensions of elbow 6 may be set according to the standard JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage". Elbow 6 may be a 90° bend elbow (so-called DL) as defined in JIS K 6739.

[0021] The vertical pipe 8 defines the vertical drainage path. In this embodiment, the vertical pipe 8 directs rainwater vertically from the water collection port 2b to the elbow 6. The vertical pipe 8 is located between the water collection port 2b and the elbow 6. The vertical pipe 8 is straight. The cross-section perpendicular to the pipe axis of the vertical pipe 8 is circular. The vertical pipe 8 is positioned such that the direction of its pipe axis coincides with the vertical direction. The vertical pipe 8 has an upstream end 8a and a downstream end 8b. The upstream end 8a is the end of the vertical pipe 8 that connects to the water collection port 2b (the upper end in Figure 1). The downstream end 8b is the end of the vertical pipe 8 that connects to the elbow 6 (the lower end in Figure 1). As an example, the material of the vertical pipe 8 is rigid polyvinyl chloride. The dimensions of the vertical pipe 8, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) in JIS K 6741 "Rigid polyvinyl chloride pipes".

[0022] Figure 2 is a perspective view of an example configuration of the drainage member 5, and Figure 3 is an exploded perspective view of the drainage member 5 in Figure 2. The drainage member 5 constitutes part of a drainage system 1 having a vertical pipe 3 and a horizontal pipe 4. In this embodiment, as shown in Figures 2 and 3, the drainage member 5 connects the vertical pipe 3 and the horizontal pipe 4. The drainage member 5 functions as a connecting joint (elbow) that connects drainage paths with different directions, such as a vertical pipe and a horizontal pipe.

[0023] The drainage member 5 in Figures 2 and 3 has a curved pipe section 51 and a straight pipe section 52. In this embodiment, the curved pipe section 51 and the straight pipe section 52 are formed as separate parts. In other words, the curved pipe section 51 and the straight pipe section 52 are separable members, and the drainage member 5 is obtained by combining the curved pipe section 51 and the straight pipe section 52.

[0024] The drainage member 5 will be further described below with reference to Figures 4 to 13. Figure 4 is a cross-sectional view of the drainage member 5. Figure 5 is an exploded cross-sectional view of the drainage member 5. Figure 6 is a cross-sectional view along line AA in Figure 4.

[0025] The drain member 5 in Figure 4 has a main body 50. The main body 50 is cylindrical, but its pipe axis (centerline) includes both curved and straight sections. The main body 50 has a first opening 5a and a second opening 5b at both ends. The inner circumferential surface 50a of the main body 50 defines a curved flow path 5c.

[0026] The first opening 5a is directed towards the upstream side of the drainage system 1. The first opening 5a is the upstream opening. In Figure 4, the first opening 5a is flow-flow connected to the horizontal pipe 4. In other words, the first opening 5a is connected to the horizontal pipe 4 such that fluid flows in and out between the horizontal pipe 4 and the first opening 5a.

[0027] The second opening 5b is directed downstream of the drainage system 1. The second opening 5b is the downstream opening. In Figure 4, the second opening 5b is flow-flow connected to the vertical pipe 3. In other words, the second opening 5b is connected to the vertical pipe 3 such that fluid flows in and out between the horizontal pipe 4 and the second opening 5b.

[0028] The curved channel 5c connects the first opening 5a and the second opening 5b. In particular, the curved channel 5c connects the first opening 5a and the second opening 5b such that the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b intersect.

[0029] In this embodiment, as can be clearly seen from Figures 4 and 5, the cross-sectional area of ​​the bent channel 5c is not constant, and there is a reduced portion 5c1 where the cross-sectional area of ​​the bent channel 5c is smaller than the cross-sectional area of ​​the second opening 5b. As shown in Figure 4, the first wall surface 50b on the inner circumference side of the bent channel 5c protrudes toward the second wall surface 50c on the outer circumference side of the bent channel 5c such that the reduced portion 5c1 is located between the inner circumference corner 5d of the bent channel 5c and the second opening 5b. The first wall surface 50b is the inner circumference side portion of the bent channel 5c on the inner circumference surface 50a of the main body 50 (for example, half of the inner circumference side). The second wall surface 50c is the outer circumference side portion of the bent channel 5c on the inner circumference surface 50a of the main body 50 (for example, half of the outer circumference side). In other words, the inner circumference surface 50a of the main body 50 is composed of the first wall surface 50b and the second wall surface 50c.

[0030] As shown in Figure 4, in the drain member 5, the first wall surface 50b on the inner circumference of the bent channel 5c protrudes (partially) toward the second wall surface 50c on the outer circumference of the bent channel 5c, such that a reduction portion 5c1 exists between the inner circumference corner 5d of the bent channel 5c and the second opening 5b, where the cross-sectional area of ​​the bent channel 5c is smaller than the cross-sectional area of ​​the second opening 5b. In other words, the first wall surface 50b includes a first portion 501 that makes the cross-sectional area of ​​the bent channel 5c smaller than the cross-sectional area of ​​the second opening 5b, and second portions 502 and third portions 503 that make the cross-sectional area of ​​the bent channel 5c equal to the cross-sectional area of ​​the second opening 5b. The second portion 502 is the portion of the first wall surface 50b between the first portion 501 and the first opening 5a. The third portion 503 is the portion of the first wall surface 50b between the first portion 501 and the second opening 5b. The first portion 501 is a portion of the first wall surface 50b that includes a projection 53 that protrudes from the first wall surface 50b toward the second wall surface 50c. The projection 53 is a portion of the first portion 501 of the first wall surface 50b that forms a reduced portion 5c1. In this embodiment, the projection 53 is lumpy. The shape and dimensions of the reduced portion 5c1 and the projection 53 will be described later.

[0031] In the drainage member 5 of Figure 4, the first portion 501 of the first wall surface 50b and the second wall surface 50c form a narrowed portion 5c1 between the inner circumferential corner 5d of the bent channel 5c and the second opening 5b. The bent channel 5c includes an upstream portion 5c2 on the first opening 5a side of the narrowed portion 5c1 and a downstream portion 5c3 on the second opening 5b side of the narrowed portion 5c1. The upstream portion 5c2 is the portion of the bent channel 5c between the inner circumferential corner 5d of the bent channel 5c and the first opening 5a, in a plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b. In other words, the upstream portion 5c2 is formed by the second portion 502 of the first wall surface 50b and the second wall surface 50c. The downstream portion 5c3 is the portion between the boundary between the first portion 501 and the second portion 502 of the first wall surface 50b and the second opening 5b, in a plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b. In other words, the downstream portion 5c3 is formed by the third portion 503 of the first wall surface 50b and the second wall surface 50c.

[0032] As shown in Figure 6, in the drainage member 5, the reduced portion 5c1 and the upstream portion 5c2 are continuously connected in at least a portion of the first wall surface 50b. Here, "X and Y are continuously connected" means that X and Y are connected in such a way that no steps or other obstacles that would hinder fluid movement occur between them. This reduces the pressure loss between the upstream portion 5c2 and the reduced portion 5c1, thereby improving the drainage capacity. In particular, in Figure 6, the reduced portion 5c1 and the upstream portion 5c2 are continuously connected in the first wall surface 50b along the central axis C2 of the second opening 5b. As shown in Figure 6, in the drainage member 5, the reduced portion 5c1 and the downstream portion 5c3 are continuously connected in at least a portion of the first wall surface 50b. This reduces the pressure loss between the downstream portion 5c3 and the reduced portion 5c1, thereby improving the drainage capacity. In particular, in Figure 6, the reduced portion 5c1 and the downstream portion 5c3 are continuously connected in the first wall surface 50b along the central axis C2 of the second opening 5b.

[0033] In this embodiment, the drainage member 5 is composed of a curved pipe section 51 and a straight pipe section 52.

[0034] As shown in Figures 4 and 5, the curved pipe section 51 has a bent portion 511 and receiving openings 512 and 513. The bent portion 511 and the receiving openings 512 and 513 are formed as a continuous, integral part.

[0035] The bent portion 511 constitutes the upstream part of the main body portion 50 of the drainage member 5. The bent portion 511 is cylindrical, but its pipe axis (centerline) is curved, not straight. In other words, the bent portion 511 has a curved pipe axis in the drainage member 5. The upstream end of the bent portion 511 has a first opening 5a. The downstream end of the bent portion 511 has a first connecting opening 511a. The inner circumferential surface 511b of the bent portion 511 constitutes the upstream part of the inner circumferential surface 50a of the main body portion 50. The central axis C3 of the first connecting opening 511a coincides with the central axis C2 of the second opening 5b. The angle between the central axis C1 of the first opening 5a and the central axis C3 of the first connecting opening 511a is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage".

[0036] The receiving openings 512 and 513 are provided at both ends of the bent section 511, respectively. The receiving opening 512 is cylindrical and surrounds the first opening 5a. The receiving opening 512 receives the horizontal pipe 4. In this embodiment, the inner diameter of the receiving opening 512 is large enough to allow the horizontal pipe 4 to be inserted into the receiving opening 512. The receiving opening 513 is cylindrical and surrounds the first connecting opening 511a. The inner diameter of the receiving opening 512 is larger than the diameter of the first opening 5a. The inner diameter of the receiving opening 513 is larger than the diameter of the first connecting opening 511a. In this embodiment, the inner diameter of the receiving opening 513 is large enough to allow the upstream end of the straight pipe section 52 to be inserted into the receiving opening 513.

[0037] For example, the material of the curved pipe section 51 may be rigid polyvinyl chloride. The dimensions of the curved pipe section 51 may be set in accordance with the standard JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage". The curved pipe section 51 may be a 90° bend elbow (so-called DL) as defined in JIS K 6739.

[0038] Figures 7 to 13 show examples of the configuration of the straight pipe section 52. Figure 7 is a perspective view of an example of the configuration of the straight pipe section 52. Figure 8 is a side view of the straight pipe section 52. Figure 9 is a plan view of the straight pipe section 52. Figure 10 is a bottom view of the straight pipe section 52. Figure 11 is a cross-sectional view taken along line BB of Figure 9. Figure 12 is a perspective cross-sectional view taken along line CC of Figure 9. Figure 13 is a cross-sectional view taken along line DD of Figure 11. Although the straight section 521 is part of the drainage member 5, reference numerals related to the bent channel 5c of the drainage member 5 (e.g., first wall surface 50b, second wall surface 50c, etc.) are added as needed to make the correspondence easier to understand.

[0039] As shown in Figures 7 and 8, the straight pipe section 52 has a straight section 521, a receiving opening 522, and a projection 523. The straight section 521, the receiving opening 522, and the projection 523 are formed as a continuous, integral piece.

[0040] The straight section 521 constitutes the downstream portion of the main body 50 of the drainage member 5. The straight section 521 is cylindrical. The pipe axis (centerline) of the straight section 521 is straight. In other words, the straight section 521 has a straight pipe axis in the drainage member 5. As shown in Figure 11, the upstream end of the straight section 521 has a second connecting opening 521a. The downstream end of the straight section 521 has a second opening 5b. The inner circumferential surface 521b of the straight section 521 constitutes the downstream portion of the inner circumferential surface 50a of the main body 50. The central axis C4 of the second connecting opening 521a coincides with the central axis C2 of the second opening 5b.

[0041] As shown in Figure 11, the receiving opening 522 is provided at the downstream end of the straight section 521. As shown in Figure 10, the receiving opening 522 is cylindrical and surrounds the second opening 5b. The inner diameter of the receiving opening 522 is larger than the diameter of the second opening 5b. The receiving opening 522 receives the vertical pipe 3. In this embodiment, the inner diameter of the receiving opening 522 is large enough to allow the vertical pipe 3 to be inserted into the receiving opening 522.

[0042] As shown in Figures 7, 8, and 11, the projection 523 is part of the protruding portion 53 (the upstream end). The projection 523 protrudes from the second connecting opening 521a to the outside of the straight portion 521. Therefore, when the curved pipe portion 51 and the straight pipe portion 52 are connected, as shown in Figure 4, the projection 523 protrudes from the second connecting opening 521a into the curved pipe portion 51 and covers a part of the inner circumferential surface of the bent portion 511 of the curved pipe portion 51. As a result, the projection 523 constitutes a part of the reduced portion 5c1 instead of the curved pipe portion 51. The tip 523a of the projection 523 coincides with the inner circumferential corner 5d of the bent flow path 5c. In this embodiment, the reduced portion 5c1 spans both the bent portion 511 of the curved pipe portion 51 and the straight portion 521 of the straight pipe portion 52, but the curved pipe portion 51 and the straight pipe portion 52 are separate entities. In this case, if the protruding portion 53 is divided at the boundary between the bent portion 511 and the straight portion 521, a step may occur at the boundary in the reduced portion 5c1. This can be one of the causes of obstruction of fluid flow in the bent channel 5c. Therefore, in this embodiment, a projection 523, which is part of the protruding portion 53, protrudes from the second connecting opening 521a to the outside of the straight portion 521 and constitutes part of the reduced portion 5c1 instead of the bent pipe portion 51. As a result, even if the reduced portion 5c1 spans both the bent portion 511 of the bent pipe portion 51 and the straight portion 521 of the straight pipe portion 52, the effect of the step at the boundary can be reduced.

[0043] As shown in Figures 7 to 9, the straight pipe section 52 further has markers 524. The markers 524 indicate information related to the assembly of the drainage member 5. In this embodiment, the markers 524 indicate the direction in which the straight pipe section 52 is connected to the curved pipe section 51. In Figure 7, the marker 524 is an arrow indicating the direction in which the straight pipe section 52 is connected to the curved pipe section 51. In Figures 7 to 9, four markers 524 are arranged at equal intervals in the circumferential direction on the outer surface of the upstream end of the straight pipe section 52. The markers 524 may be letters, figures, symbols, three-dimensional shapes, or colors, or combinations thereof, that are recognizable by human perception. In this embodiment, when the straight pipe section 52 is connected to the curved pipe section 51, the markers 524 are positioned on the outer surface of the straight pipe section 52 so as not to be hidden by the receiving opening 513 of the curved pipe section 51. However, when the straight pipe section 52 is connected to the curved pipe section 51, the marker 524 may be located on the outer surface of the straight pipe section 52 in a position where it is hidden by the receiving opening 513 of the curved pipe section 51.

[0044] Next, the assembly of the drainage member 5 will be briefly explained with reference to Figures 4 and 5. When assembling the drainage member 5, as shown in Figure 5, the upstream end of the straight section 521 of the straight pipe section 52 is directed toward the receiving opening 513 of the curved pipe section 51. In this case, the mark 524 on the straight pipe section 52 helps to determine the orientation of the straight pipe section 52 relative to the curved pipe section 51. Then, the upstream end of the straight section 521 of the straight pipe section 52 is inserted into the receiving opening 513 of the curved pipe section 51. This connects the curved pipe section 51 and the straight pipe section 52, as shown in Figure 4. With the curved pipe section 51 and the straight pipe section 52 connected, the upstream end of the straight section 521 is inside the receiving opening 513 of the curved pipe section 51, and the first connecting opening 511a of the curved pipe section 51 and the second connecting opening 521a of the straight section 521 are connected. As a result, the inner circumferential surface 511b of the curved pipe section 51 and the inner circumferential surface 521b of the straight pipe section 52 are connected, forming a curved flow channel 5c. In this embodiment, the straight pipe section 52 has a projection 523. The projection 523 protrudes into the curved pipe section 51 from the second connecting opening 521a and constitutes a part of the reduced portion 5c1 in place of the curved pipe section 51.

[0045] In the drainage member 5 described above, as shown in Figure 4, the first wall surface 50b on the inner circumference of the bent channel 5c protrudes toward the second wall surface 50c on the outer circumference of the bent channel 5c, such that a reduced portion 5c1 exists between the inner circumference corner 5d of the bent channel 5c and the second opening 5b, where the cross-sectional area of ​​the bent channel 5c is smaller than the cross-sectional area of ​​the second opening 5b.

[0046] Next, the function of the reduced portion 5c1 (protruding portion 53) of the drain member 5 will be explained. As shown in Figures 1, 2, and 4, the drain member 5 connects the vertical pipe 3 and the horizontal pipe 4 in the drainage system 1. Specifically, in the drain member 5, the horizontal pipe 4 is connected to the first opening 5a and the vertical pipe 3 is connected to the second opening 5b. The drain member 5 allows water flowing in from the horizontal pipe 4 to flow into the vertical pipe 3. In Figure 4, the drain member 5 changes the direction of the water flow from the direction of the central axis C1 of the first opening 5a to the direction of the central axis C2 of the second opening 5b. When the direction of water flow changes significantly, pressure loss due to separation can be one of the causes of a decrease in drainage performance.

[0047] Figure 14 is a simulation of the pressure distribution in the comparative example drain member 500. The comparative example drain member 500 differs from the drain member 5 in that it does not have a reduced portion 5c1. In Figure 14, darker colors indicate lower pressure. In particular, the pressure loss is large in the area indicated by R in Figure 14, and the existence of such a large pressure loss area can be a major factor in the deterioration of drainage performance. The pressure loss in the area indicated by R in Figure 14 is thought to be due to separation. This separation is caused by the water separating from the first wall surface 50b downstream of the corner 5d of the bent channel 5c. In other words, as indicated by the arrow F in Figure 14, the water flowing into the drain member 500 from the upstream side of the drainage system 1 initially flows along the first wall surface 50b in the bent channel 5c, but after the corner 5d of the bent channel 5c, it may separate from the first wall surface 50b of the bent channel 5c. Such separation is particularly noticeable when the water flow velocity is high. The faster the flow velocity, the wider the range over which pressure loss occurs tends to be.

[0048] In this embodiment, the drainage member 5 has a reduced portion 5c1. The presence of the reduced portion 5c1 is expected to (1) make it easier for water to flow along the first wall surface 50b than if the reduced portion 5c1 were absent, and (2) reduce the number of areas where pressure loss may occur. Therefore, the drainage member 5 can improve drainage performance by reducing the occurrence of pressure loss caused by separation downstream from the corner 5d. Unlike the technology described in Patent Document 1, the drainage member 5 does not require a large radius of curvature of the inner wall surface on the inner circumference side, thus enabling miniaturization. Therefore, the drainage member 5 can improve drainage capacity while enabling miniaturization. Because the drainage member 5 itself can be miniaturized, the drainage member 5 becomes less conspicuous when viewed as part of the entire drainage system 1. This is expected to improve the overall aesthetics of the drainage system 1.

[0049] Next, examples of the shape and dimensions of the reduced portion 5c1 will be described. Since the protrusion 53 defines the shape and dimensions of the reduced portion 5c1, it is understood that any reference to the shape and dimensions of the reduced portion 5c1 also applies to the shape and dimensions of the protrusion 53.

[0050] Refer to Figures 4 and 6. Let d be the diameter of the second opening 5b, and L be the length of the reduced portion 5c1 in the direction of the central axis C2 of the second opening 5b. In the drainage member 5, it is preferable that 0.5d ≤ L ≤ 5.0d. This can further reduce the occurrence of pressure loss due to separation downstream from corner 5d. Therefore, it is possible to improve drainage capacity while enabling miniaturization.

[0051] In Figures 4 and 6, part P of the drainage member 5 is the part where the cross-sectional area of ​​the flow path is minimized in the reduced portion 5c1. D1 is the distance between the inner circumference corner 5d of the bent flow path 5c and part P in the direction of the central axis C2 of the second opening 5b. It is preferable that 0 ≤ D1 ≤ 0.5d in the drainage member 5. This can further reduce the occurrence of pressure loss caused by separation downstream from corner 5d. Therefore, it is possible to improve drainage capacity while enabling miniaturization.

[0052] In Figures 4 and 6, D3 is the distance between part P and the downstream end in the reduced portion 5c1. D3 = L - D1. In the drainage member 5, it is desirable that D3 > D1. This can further reduce the occurrence of pressure loss due to separation downstream from corner 5d. Therefore, it is possible to improve drainage capacity while enabling miniaturization.

[0053] Refer to Figures 9 and 11. In the plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b, the minimum distance between the first wall surface 50b and the second wall surface 50c in the reduced portion 5c1 is D2. D2 is also the distance between portion P of the reduced portion 5c1 and the second wall surface 50c. In the drainage member 5, it is preferable that 0.60d ≤ D2 ≤ 0.95d. This can further reduce the occurrence of pressure loss caused by separation downstream from corner 5d. Therefore, it is possible to improve drainage capacity while enabling miniaturization. Here, in the plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b, the maximum height of the protrusion 53 is D4. D4 is also the height of the protrusion 53 at portion P of the reduced portion 5c1. D4 = d - D2. In the drainage member 5, it is preferable that 0.05d ≤ D4 ≤ 0.40d. This can further reduce pressure loss caused by separation downstream from corner 5d. Therefore, it is possible to improve drainage capacity while enabling miniaturization.

[0054] Refer to Figure 13. Let A be the cross-sectional area of ​​the second opening 5b, and A1 be the minimum cross-sectional area of ​​the bent channel 5c. The minimum cross-sectional area of ​​the bent channel 5c is the cross-sectional area of ​​the channel at point P in the reduced section 5c1. In the drainage member 5, 0.6 ≤ A1 / A < 1. This further reduces the occurrence of pressure loss due to separation downstream from corner 5d. Therefore, the drainage capacity can be improved while enabling miniaturization. Here, let A2 be the maximum cross-sectional area of ​​the protrusion 53. A2 is also the cross-sectional area of ​​the protrusion 53 at point P in the reduced section 5c1. A2 = A - A1. In the drainage member 5, it is desirable that A2 / A ≤ 0.4. This further reduces the occurrence of pressure loss due to separation downstream from corner 5d. Therefore, the drainage capacity can be improved while enabling miniaturization.

[0055] Refer to Figures 4 and 6. In the plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b, the first wall surface 50b includes a curved shape that protrudes toward the second wall surface 50c at the reduced portion 5c1. In other words, the surface of the protruding portion 53 is curved. This improves the drainage capacity. Here, a smaller surface roughness of the protruding portion 53 is preferable because it is expected to improve the drainage capacity.

[0056] Refer to Figures 9, 10, and 13. When viewed from the direction of the central axis C2 of the second opening 5b, the first wall surface 50b in the reduced portion 5c1 has a shape in which the center is recessed compared to the sides. In other words, when viewed from the direction of the central axis C2 of the second opening 5b, the protruding portion 53 has a shape in which the first wall surface 50b has a shape in which the center is recessed compared to the sides. This improves the drainage capacity.

[0057] From another perspective, the first wall surface 50b on the inner circumference of the bent channel 5c only needs to have a shape that protrudes toward the second wall surface 50c on the outer circumference of the bent channel 5c so as to create a Coanda effect between the inner circumference corner 5d of the bent channel 5c and the second opening 5b. In other words, the protruding portion 53 only needs to have a shape that creates a Coanda effect between the inner circumference corner 5d of the bent channel 5c and the second opening 5b. This makes it possible to improve drainage capacity while enabling miniaturization.

[0058] [1.2 Effects, etc.] The drain member 5 described above constitutes a part of the drainage system 1 having a vertical pipe 3 and a horizontal pipe 4. The drain member 5 has a first opening 5a facing the upstream side of the drainage system 1, a second opening 5b facing the downstream side of the drainage system 1, and a bent channel 5c connecting the first opening 5a and the second opening 5b such that their central axes C1 and C2 intersect. The first wall surface 50b on the inner side of the bent channel 5c protrudes toward the second wall surface 50c on the outer side of the bent channel 5c such that a narrowing portion 5c1 exists between the inner corner 5d of the bent channel 5c and the second opening 5b, where the cross-sectional area of ​​the bent channel 5c is smaller than the cross-sectional area of ​​the second opening 5b. If the diameter of the second opening 5b is d and the length of the narrowing portion 5c1 in the direction of the central axes C1 and C2 of the second opening 5b is L, then 0.5d ≤ L ≤ 5.0d. This configuration allows for miniaturization while improving drainage capacity.

[0059] In the drainage member 5, the narrowed portion 5c1 and the upstream portion 5c2 on the first opening 5a side of the narrowed portion 5c1 in the bent flow path 5c are continuously connected at least in part of the first wall surface 50b. This configuration can reduce pressure loss between the upstream portion 5c2 and the narrowed portion 5c1, thereby improving drainage capacity.

[0060] In the drainage member 5, the narrowed portion 5c1 and the downstream portion 5c3 on the second opening 5b side of the narrowed portion 5c1 in the bent flow path 5c are continuously connected at least in part of the first wall surface 50b. This configuration can reduce pressure loss between the downstream portion 5c3 and the narrowed portion 5c1, thereby improving drainage capacity.

[0061] In the drainage member 5, if D1 is the distance between the inner circumferential corner 5d of the bent flow channel 5c and the part P in the narrowed portion 5c1 where the flow channel cross-sectional area is minimized, then 0 ≤ D1 ≤ 0.5d. This configuration can reduce peeling near the inner circumferential corner 5d of the bent flow channel 5c and improve drainage capacity.

[0062] In the drainage member 5, if D2 is the minimum distance between the first wall surface 50b and the second wall surface 50c in the reduced portion 5c1 in the plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b, then 0.60d ≤ D2 ≤ 0.95d. This configuration can improve drainage capacity.

[0063] In the drainage member 5, if the cross-sectional area of ​​the second opening 5b is A and the minimum value of the cross-sectional area of ​​the bent channel 5c is A1, then 0.6 ≤ A1 / A < 1.0. This configuration can improve drainage capacity.

[0064] The drainage member 5 has a receiving port 522 for connecting a piping member to the second opening 5b. This configuration improves the ease of installation.

[0065] In the drainage member 5, in the plane passing through the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b, the first wall surface 50b includes a curved shape that protrudes toward the second wall surface 50c side at the reduced portion 5c1. This configuration can improve drainage capacity.

[0066] In the drainage member 5, when viewed from the direction of the central axis C2 of the second opening 5b, the first wall surface 50b in the reduced portion 5c1 has a shape in which the center is recessed compared to the sides. This configuration can improve drainage capacity.

[0067] In the drainage member 5, the drainage member 5 comprises a curved pipe section 51 having a first opening 5a and a first connecting opening 511a having a central axis C3 that coincides with the central axis C2 of the second opening 5b, and a straight pipe section 52 having a second opening 5b and a second connecting opening 521a that has a central axis C42 that coincides with the central axis C2 of the second opening 5b and is connected to the first connecting opening 511a. The inner circumferential surface 511b of the curved pipe section 51 and the inner circumferential surface 521b of the straight pipe section 52 define the curved flow path 5c. This configuration allows for miniaturization while improving drainage capacity.

[0068] In the drainage member 5, the curved pipe section 51 and the straight pipe section 52 are formed separately. The straight pipe section 52 has a projection 523 that protrudes into the curved pipe section 51 from the second connecting opening 521a and forms part of the reduced section 5c1 in place of the curved pipe section 51. This configuration allows for miniaturization while improving drainage capacity.

[0069] From another perspective, the drainage member 5 described above constitutes a part of the drainage system 1 having a vertical pipe 3 and a horizontal pipe 4. The drainage member 5 has a first opening 5a facing the upstream side of the drainage system 1, a second opening 5b facing the downstream side of the drainage system 1, and a curved channel 5c connecting the first opening 5a and the second opening 5b such that the central axis C1 of the first opening 5a and the central axis C2 of the second opening 5b intersect. The first wall surface 50b on the inner circumference side of the curved channel 5c has a shape that protrudes toward the second wall surface 50c on the outer circumference side of the curved channel 5c so as to create a Coanda effect between the inner circumference corner 5d of the curved channel 5c and the second opening 5b. This configuration allows for miniaturization while improving drainage capacity.

[0070] The drainage system 1 described above comprises a drainage member 5, a vertical pipe 3, and a horizontal pipe 4. The horizontal pipe 4 is connected to the first opening 5a of the drainage member 5. The vertical pipe 3 is connected to the second opening 5b of the drainage member 5. This configuration allows for miniaturization while improving drainage capacity.

[0071] The drainage system 1 further includes a drain 7 positioned at the water collection port 2b to generate a siphon effect, and an elbow 6 connecting the upstream end 4a of the horizontal pipe 4 to the water collection port 2b. This configuration can improve drainage capacity.

[0072] [2. Variant] The embodiments of this disclosure are not limited to those described above. The embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure can be achieved. The following lists some modifications of the embodiments. The modifications described below can be combined and applied as appropriate.

[0073] In the above embodiment, the curved pipe section 51 and the straight pipe section 52 are formed separately. The straight pipe section 52 has a projection 523 that protrudes into the curved pipe section 51 from the second connecting opening 521a and constitutes part of the reduced portion 5c1 in place of the curved pipe section 51. In other words, the straight pipe section 52 has a projection 53 that defines the reduced portion 5c1. However, the projection 53 may also be provided by the curved pipe section 51. For example, the curved pipe section 51 may have a projection that protrudes into the straight pipe section 52 from the first connecting opening 511a and constitutes part of the reduced portion 5c1 in place of the straight pipe section 52. This also allows for miniaturization while improving drainage capacity. In short, when the curved pipe section 51 and the straight pipe section 52 are formed separately, one of the curved pipe section 51 and the straight pipe section 52 may have a projection that protrudes into the other of the curved pipe section 51 and the straight pipe section 52 and constitutes part of the reduced portion 5c1 in place of the other. If the curved pipe section 51 has a protruding section 53, the straight pipe section 52 may be the upstream end of the vertical pipe 3. In other words, in the drainage member 5, the upstream end of the vertical pipe 3 may be used as the straight pipe section 52.

[0074] In the above embodiment, the curved pipe section 51 and the straight pipe section 52 of the drainage member 5 are formed separately. That is, the curved pipe section 51 and the straight pipe section 52 are separable members, and the drainage member 5 is obtained by combining the curved pipe section 51 and the straight pipe section 52. In one modified example, the curved pipe section 51 and the straight pipe section 52 may be formed integrally. This also allows for miniaturization while improving drainage capacity. In this case, the receiving opening 513 may not be necessary in the curved pipe section 51. The marker 524 may also not be necessary in the straight pipe section 52.

[0075] In one modified example, the reduced portion 5c1 (or protrusion 53) does not necessarily have to start from the inner circumferential corner 5d of the bent flow channel 5c. The reduced portion 5c1 (or protrusion 53) only needs to be located between the inner circumferential corner 5d of the bent flow channel 5c and the second opening 5b.

[0076] In one modified example, the shape and dimensions of the reduced portion 5c1 (or protruding portion 53) are not limited to the above embodiment.

[0077] In one modified example, the shape and size of part or all of the drain member 5 may differ from those of the above embodiment and modified example. For example, unlike the above embodiment, the shape of the curved pipe section 51 and / or the straight pipe section 52 of the drain member 5 may be polygonal instead of circular.

[0078] In one modified example, the material of the drainage member 5 does not necessarily have to be rigid polyvinyl chloride. The material of the drainage member 5 may be determined according to the requirements of the drainage system 1, and may be a synthetic resin such as polyethylene, for example. Alternatively, the material of the drainage member 5 may be metal instead of a synthetic resin.

[0079] In one modified example, the drainage member 5 does not need to have the marker 524.

[0080] In one modified example, the drainage system 1 does not necessarily have to be equipped with a gutter 2. For example, if the building 11 has a structure that includes a water collection opening such as a balcony, the elbow 6 of the drainage system 1 may be connected to the water collection opening of the building 11.

[0081] In one modified example, a drain member 5 may be used instead of the elbow 6 in the drainage system 1. In this case, the downstream end 8b of the vertical pipe 8 may be connected to the first opening 5a of the drain member 5, and the upstream end 4a of the horizontal pipe 4 may be connected to the second opening 5b. In one modified example, the elbow 6 and the drain member 5 may be swapped.

[0082] In one modified example, the drain 7 may be a drain with a structure that is generally not considered to contribute to the occurrence of the siphon phenomenon. In one modified example, the drainage system 1 does not necessarily have to be equipped with a drain 7. The drain 7 is not an essential component of the drainage system 1 and may be provided as appropriate considering the installation environment of the drainage system 1.

[0083] In one modified example, the drainage system 1 does not necessarily have to be equipped with a vertical pipe 8. The vertical pipe 8 is not an essential component of the drainage system 1 and may be provided as appropriate, taking into consideration the installation environment of the drainage system 1.

[0084] [3. Appearance] As is clear from the above embodiments and modifications, this disclosure includes the following aspects. In the following, reference numerals are enclosed in parentheses solely to indicate their correspondence with the embodiments. Note that, for the sake of readability, the notation of reference numerals enclosed in parentheses may be omitted after the first occurrence.

[0085] The first embodiment is a drainage member (5) that constitutes part of a drainage system (1) having vertical pipes (3,8) and horizontal pipes (4), and includes a first opening (5a) directed toward the upstream side of the drainage system (1), a second opening (5b) directed toward the downstream side of the drainage system (1), and a bent flow path (5c) connecting the first opening (5a) and the second opening (5b) such that the central axis (C1) of the first opening (5a) and the central axis (C2) of the second opening (5b) intersect. The first wall surface (50b) on the inner circumference side of the bent flow path (5c) protrudes toward the second wall surface (50c) on the outer circumference side of the bent flow path (5c) such that a narrowing portion (5c1) exists between the inner circumference corner (5d) of the bent flow path (5c) and the second opening (5b) where the cross-sectional area of ​​the bent flow path (5c) is smaller than the cross-sectional area of ​​the second opening (5b). If the diameter of the second opening (5b) is d and the length of the reduced portion (5c1) in the direction of the central axis (C2) of the second opening (5b) is L, then 0.5d ≤ L ≤ 5.0d. This configuration allows for miniaturization while improving drainage capacity.

[0086] The second embodiment is a drainage member (5) based on the first embodiment. In this embodiment, the narrowed portion (5c1) and the upstream portion (5c2) on the first opening (5a) side of the narrowed portion (5c1) in the bent flow path (5c) are continuously connected in at least a part of the first wall surface (50b). This embodiment can reduce pressure loss between the upstream portion (5c2) and the narrowed portion (5c1) and improve drainage capacity.

[0087] A third embodiment is a drainage member (5) based on the first or second embodiment. In this embodiment, the narrowed portion (5c1) and the downstream portion (5c3) of the bent flow path (5c) on the second opening (5b) side of the narrowed portion (5c1) are continuously connected in at least a portion of the first wall surface (50b). This embodiment can reduce pressure loss between the downstream portion (5c3) and the narrowed portion (5c1) and improve drainage capacity.

[0088] The fourth embodiment is a drainage member (5) based on any one of the first to third embodiments. In this embodiment, if D1 is the distance between the inner circumferential corner (5d) of the bent flow channel (5c) and the portion (P) in the reduced portion (5c1) where the cross-sectional area of ​​the flow channel is minimized, then 0 ≤ D1 ≤ 0.5d. This embodiment can reduce peeling near the inner circumferential corner (5d) of the bent flow channel (5c) and improve drainage capacity.

[0089] The fifth embodiment is a drainage member (5) based on any one of the first to fourth embodiments. In this embodiment, if D2 is the minimum value of the distance between the first wall surface (50b) and the second wall surface (50c) in the reduced portion (5c1) in the plane passing through the central axis (C1) of the first opening (5a) and the central axis (C2) of the second opening (5b), then 0.60d ≤ D2 ≤ 0.95d. This embodiment can improve drainage capacity.

[0090] The sixth embodiment is a drainage member (5) based on any one of the first to fifth embodiments. In this embodiment, if the cross-sectional area of ​​the second opening (5b) is A and the minimum value of the cross-sectional area of ​​the bent flow path (5c) is A1, then 0.6 ≤ A1 / A < 1.0. This embodiment can improve drainage capacity.

[0091] The seventh embodiment is a drainage member (5) based on any one of the first to sixth embodiments. In this embodiment, the second opening (5b) has a receiving port (522) for connecting a piping member. This embodiment can improve ease of installation.

[0092] The eighth embodiment is a drainage member (5) based on any one of the first to seventh embodiments. In this embodiment, in a plane passing through the central axis (C1) of the first opening (5a) and the central axis (C2) of the second opening (5b), the first wall surface (50b) includes a curved shape that protrudes toward the second wall surface (50c) at the reduced portion (5c1). This embodiment can improve drainage capacity.

[0093] The ninth embodiment is a drainage member (5) based on any one of the first to eighth embodiments. In this embodiment, when viewed from the direction of the central axis (C2) of the second opening (5b), the first wall surface (50b) in the reduced portion (5c1) has a shape in which the center is recessed more than the sides. This embodiment can improve drainage capacity.

[0094] The tenth embodiment is a drainage member (5) based on any one of the first to ninth embodiments. In this embodiment, the drainage member (5) comprises a curved pipe section (51) having a first opening (5a) and a first connecting opening (511a) having a central axis (C3) that coincides with the central axis (C2) of the second opening (5b), and a straight pipe section (52) having a second opening (5b) and a second connecting opening (521a) that has a central axis (C42) that coincides with the central axis (C2) of the second opening (5b) and is connected to the first connecting opening (511a). The inner circumferential surface (511b) of the curved pipe section (51) and the inner circumferential surface (521b) of the straight pipe section (52) define the curved flow path (5c). This embodiment allows for miniaturization while improving drainage capacity.

[0095] The eleventh embodiment is a drainage member (5) based on the tenth embodiment. In this embodiment, the curved pipe section (51) and the straight pipe section (52) are formed separately. The straight pipe section (52) has a projection (523) that protrudes from the second connecting opening (521a) into the curved pipe section (51) and constitutes part of the reduced portion (5c1) in place of the curved pipe section (51). This embodiment allows for miniaturization while improving drainage capacity.

[0096] The twelfth embodiment is a drainage member (5) based on the tenth embodiment. In this embodiment, the curved pipe section (51) and the straight pipe section (52) are formed integrally. This embodiment allows for miniaturization while improving drainage capacity.

[0097] The thirteenth embodiment is a drainage member (5) that constitutes part of a drainage system (1) having vertical pipes (3,8) and horizontal pipes (4), and has a first opening (5a) directed toward the upstream side of the drainage system (1), a second opening (5b) directed toward the downstream side of the drainage system (1), and a bent channel (5c) connecting the first opening (5a) and the second opening (5b) such that the central axis (C1) of the first opening (5a) and the central axis (C2) of the second opening (5b) intersect. The first wall surface (50b) on the inner circumference side of the bent channel (5c) has a shape that protrudes toward the second wall surface (50c) on the outer circumference side of the bent channel (5c) so as to create a Coanda effect between the inner circumference corner (5d) of the bent channel (5c) and the second opening (5b). This embodiment can improve drainage capacity while enabling miniaturization.

[0098] The 14th embodiment is a drainage system (1) comprising a drainage member (5) based on any one of the first to 13 embodiments, a vertical pipe (3), and a horizontal pipe (4). The horizontal pipe (4) is connected to the first opening (5a) of the drainage member (5). The vertical pipe (3) is connected to the second opening (5b) of the drainage member (5). This embodiment allows for miniaturization while improving drainage capacity.

[0099] The 15th embodiment is a drainage system (1) based on the 14th embodiment. In this embodiment, the drainage system (1) further comprises a drain (7) positioned at the water collection port (2b) to generate a siphon effect, and an elbow (6) connecting the upstream end (4a) of the horizontal pipe (4) to the water collection port (2b). This embodiment can improve drainage capacity.

[0100] The second to twelfth, fourteenth, and fifteenth aspects described above are optional elements. [Industrial applicability]

[0101] This disclosure is applicable to drainage members and drainage systems. Specifically, it is applicable to drainage members for connecting vertical and horizontal pipes, and to drainage systems that utilize the siphon effect for drainage. [Explanation of Symbols]

[0102] 1. Drainage system 2b Water collection port 3. Vertical pipe 4 horizontal pipe 5 Drainage member 5a 1st opening 5b 2nd opening 5c Bent channel 5c1 Reduced area 5c2 upstream site 5c3 downstream site 5d angle (angle on the inner circumference side of the bent channel) 50b First Wall 50c Second Wall C1 center axis C2 center axis P region (the region where the flow channel cross-sectional area is smallest in the reduced region) 51 Bent pipe section 511a 1st connection opening 511b Inner surface 52 Straight pipe section 521a 2nd connection opening 521b Inner surface 522 Receptacle 523 Protrusion 6 Elbow 7 Drain 8 Vertical pipe

Claims

1. A drainage member that constitutes part of a drainage system having vertical and horizontal pipes, A first opening directed upstream of the drainage system, A second opening directed downstream of the drainage system, A curved channel connecting the first and second openings such that the central axis of the first opening and the central axis of the second opening intersect, It has, The first wall surface on the inner circumference of the bent channel protrudes toward the second wall surface on the outer circumference of the bent channel, such that a reduced portion exists between the inner circumference corner of the bent channel and the second opening, where the cross-sectional area of ​​the bent channel becomes smaller than the cross-sectional area of ​​the second opening. If the diameter of the second opening is d and the length of the reduced portion in the direction of the central axis of the second opening is L, then 0.5d ≤ L ≤ 5.0d, The reduced portion is formed such that the first wall surface partially protrudes circumferentially toward the second wall surface, so that the flow path cross-sectional area decreases and then increases from the upstream side to the downstream side of the drainage system, and has a portion where the flow path cross-sectional area is minimized. Drainage component.

2. The reduced portion and the upstream portion of the bent flow path on the first opening side of the reduced portion are continuously connected in at least a part of the first wall surface. The drainage member according to claim 1.

3. The reduced portion and the downstream portion of the bent flow path on the second opening side from the reduced portion are continuously connected in at least a part of the first wall surface. The drainage member according to claim 1.

4. If D1 is the distance between the inner circumferential corner of the bent flow path in the direction of the central axis of the second opening and the point in the reduced portion where the flow path cross-sectional area is minimized, then 0 ≤ D1 ≤ 0.5d. A drainage member according to any one of claims 1 to 3.

5. In the plane passing through the central axis of the first opening and the second opening, if D2 is the minimum distance between the first wall surface and the second wall surface in the reduced portion, then 0.60d ≤ D2 ≤ 0.95d. A drainage member according to any one of claims 1 to 3.

6. If the cross-sectional area of ​​the second opening is A, and the minimum value of the cross-sectional area of ​​the bent flow path is A1, then 0.6 ≤ A1 / A < 1.

0. A drainage member according to any one of claims 1 to 3.

7. The second opening has a receiving port for connecting a piping member, A drainage member according to any one of claims 1 to 3.

8. In a plane passing through the central axis of the first opening and the central axis of the second opening, the first wall surface includes a curved shape that protrudes toward the second wall surface in the reduced portion. A drainage member according to any one of claims 1 to 3.

9. Viewed from the direction of the central axis of the second opening, in the reduced portion, the first wall surface has a shape in which the center is more recessed than the sides. A drainage member according to any one of claims 1 to 3.

10. A curved pipe section having the first opening and a first connecting opening having a central axis that coincides with the central axis of the second opening, A straight pipe section having the second opening and a second connecting opening having a central axis that coincides with the central axis of the second opening and is connected to the first connecting opening, Equipped with, The inner circumferential surface of the curved pipe section and the inner circumferential surface of the straight pipe section define the curved flow path. A drainage member according to any one of claims 1 to 3.

11. A drainage member that constitutes part of a drainage system having vertical pipes and horizontal pipes, A first opening directed upstream of the drainage system, A second opening directed downstream of the drainage system, A curved channel connecting the first and second openings such that the central axis of the first opening and the central axis of the second opening intersect, It has, The first wall surface on the inner circumference of the bent channel protrudes toward the second wall surface on the outer circumference of the bent channel, such that a reduced portion exists between the inner circumference corner of the bent channel and the second opening, where the cross-sectional area of ​​the bent channel becomes smaller than the cross-sectional area of ​​the second opening. If the diameter of the second opening is d and the length of the reduced portion in the direction of the central axis of the second opening is L, then 0.5d ≤ L ≤ 5.0d, A curved pipe section having the first opening and a first connecting opening having a central axis that coincides with the central axis of the second opening, A straight pipe section having the second opening and a second connecting opening having a central axis that coincides with the central axis of the second opening and is connected to the first connecting opening, Equipped with, The inner surface of the curved pipe section and the inner surface of the straight pipe section define the curved flow path, The curved section and the straight section are formed separately. The straight pipe section has a projection that protrudes from the second connecting opening into the curved pipe section and constitutes a part of the reduced portion in place of the curved pipe section. Drainage component.

12. The curved section and the straight section are formed integrally. The drainage member according to claim 10.

13. A drainage member according to any one of claims 1 to 3, The aforementioned vertical pipe and, The aforementioned horizontal pipe, Equipped with, The horizontal pipe is connected to the first opening of the drainage member, The vertical pipe is connected to the second opening of the drainage member. Drainage system.

14. A drain is placed at the water collection point to generate a siphon effect, An elbow is provided to connect the upstream end of the horizontal pipe to the water collection port, It also has, The drainage system according to claim 13.

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