Piping systems and piping components

Abstract

To provide a piping system and piping components that can suppress impacts to the piping. [Solution] The piping system 1 comprises a vertical pipe, a horizontal pipe located between the downstream end of the vertical pipe and a rainwater drain, a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, and one or more protruding members located inside at least one of the vertical pipe and the horizontal pipe at the end on the bent pipe side, which partially reduce the cross-sectional area of ​​the flow path.

Description

Technical Field

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

Background Art

[0002] Patent Document 1 discloses a siphonic gutter system (piping system). The siphonic gutter system disclosed in Patent Document 1 includes: an eaves gutter fixed to the eaves so as to be substantially horizontal; a first elbow connected to the downstream side of the eaves gutter; a connecting gutter connected to the downstream end of the first elbow; a second elbow connected to the downstream end of the connecting gutter; a downpipe (vertical pipe) connected to the downstream end of the second elbow. Further, at the downstream end of the downpipe, a third elbow, a first horizontally extending straight pipe (horizontal pipe), a diameter-expanding joint and a second straight pipe, and a fourth elbow are connected in this order.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology disclosed in Patent Document 1, an improvement in flow rate (drainage capacity) can be expected. However, due to pressure loss generated in the third elbow (bent pipe) connecting the downpipe and the first straight pipe, the flow velocity decreases sharply at the third elbow, which may cause rainwater to collide violently against the third elbow. This can be a contributing factor to damage to the third elbow. It is considered that increasing the size of the third elbow to increase the curvature can reduce the impact applied to the third elbow, but naturally, this leads to an increase in the size of the piping system itself.

[0005] The present disclosure provides a piping system and a piping member that can suppress impact to piping while enabling size reduction.

Means for Solving the Problems

[0006] A piping system according to one aspect of the present disclosure comprises a vertical pipe, a horizontal pipe between the downstream end of the vertical pipe and a rainwater drain, a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, and one or more protruding members disposed inside at least one of the vertical pipe and the horizontal pipe at the end on the bent pipe side, which partially reduce the cross-sectional area of ​​the flow path.

[0007] A piping member according to one aspect of the present disclosure is a piping member that constitutes part of a piping system comprising a vertical pipe, a horizontal pipe located between the downstream end of the vertical pipe and a rainwater drain, and a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, and comprises a straight pipe constituting at least a part of the vertical pipe or the horizontal pipe, and a protruding member arranged inside the straight pipe. [Effects of the Invention]

[0008] The embodiments of this disclosure enable miniaturization while suppressing impact on the bent pipe connecting the vertical pipe and the horizontal pipe. [Brief explanation of the drawing]

[0009] [Figure 1] Schematic diagram of an example of the piping system configuration according to Embodiment 1 [Figure 2] Perspective view of the piping components of the piping system according to Embodiment 1 [Figure 3] Exploded perspective view of the piping member according to Embodiment 1 [Figure 4] Cross-sectional view of a piping member according to Embodiment 1 [Figure 5] Cross-sectional view along line AA in Figure 4 [Figure 6] Cross-sectional view showing a portion of the piping member according to Embodiment 1 with a section cut out. [Figure 7] Plan view of the piping member according to Embodiment 1 [Figure 8] Bottom view of the piping member according to Embodiment 1 [Figure 9] Figure 5: Cross-sectional view of line IX-IX [Figure 10] Cross-sectional view of line XX in Figure 5 [Figure 11] Cross-sectional view taken along line XI-XI in FIG. 5 [Figure 12] Cross-sectional view taken along line XII-XII in FIG. 5 [Figure 13] Cross-sectional view taken along line XIII-XIII in FIG. 5 [Figure 14] Cross-sectional view taken along line B-B in FIG. 2 [Figure 15] Simulation diagram of pressure distribution in the piping member of the comparative example [Figure 16] Schematic diagram of a configuration example of the piping system according to the second embodiment DETAILED DESCRIPTION OF EMBODIMENTS

[0010] Hereinafter, embodiments will be described in detail with appropriate reference to the drawings. However, an excessively detailed description may be omitted. For example, a detailed description of already well-known matters or a repeated description of substantially the same configuration may be omitted. This is to prevent the following description from being unnecessarily redundant and to facilitate understanding by those skilled in the art. The inventor(s) provides the accompanying drawings and the following description for those skilled in the art to fully understand the present disclosure, and does not intend to limit the subject matter recited in the claims by these.

[0011] 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 ratio of the size and thickness of each component in each drawing does not necessarily reflect the actual dimensional ratio. In addition, the dimensional ratio of each component is not limited to the ratio shown in the drawings.

[0012] In the following description, when it is necessary to distinguish a plurality of components from each other, 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 reference numerals assigned thereto, the prefixes such as "first" and "second" may be omitted in consideration of readability of the text.

[0013] [1.1. First Embodiment] [1.1.1. Configuration] Fig. 1 is a schematic diagram of a configuration example of a piping system 1 according to a first embodiment. The piping system 1 is a rain gutter system that receives rainwater from a roof 11a of a building 11 and causes the rainwater to flow into a drainage pit 21 in the ground 20. The piping system 1 constitutes a flow path for rainwater. The rainwater collected in the drainage pit 21 flows out from the drainage pit 21 through an embedded pipe 22 into a rainwater pipe. The building 11 is, for example, a building of a non-residential facility such as a store, an office, a factory, a building, a school, a welfare facility, or a hospital, or a residential facility such as a detached house, an apartment complex, or each dwelling unit in a detached house or an apartment complex. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complex facilities, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground malls, stations, airports, and the like. The plurality of roofs 11a of the building 11 may include eaves (small roofs) and a main roof. The roof 11a may be a flat roof or a folded-plate roof. In Fig. 1, the roof 11a is a folded-plate roof.

[0014] The piping system 1 in Fig. 1 includes an eave gutter 2, a vertical pipe 3, a horizontal pipe 4, a bent pipe 5, protruding members 6-1 and 6-2 (hereinafter referred to as a protruding member 6 when there is no need to distinguish between them), and a drain 7.

[0015] The eave gutter 2 receives rainwater from the roof 11a of the building 11. The eave gutter 2 is installed under the roof 11a of the building 11. As an example, the eave gutter 2 is installed at the eaves edge of the roof 11a. In particular, the eave gutter 2 is disposed so as to extend along the eaves edge of the roof 11a. The eave gutter 2 in Fig. 1 is a long trough shape. The eave gutter 2 in Fig. 1 has a bottom wall 2a. A water collection port 2b is formed in the bottom wall 2a in accordance with the overall design of the piping 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 down outlet. As an example, the eave gutter 2 can be formed by extrusion molding of a resin material. The eave gutter 2 may include a core material for reinforcing the strength of the entire eave gutter. The core material can be made of metal, for example. As another example, the eave gutter 2 may be formed of a metal plate, such as a steel plate (also referred to as a coil).

[0016] The drain 7 is positioned at the water collection opening 2b of the gutter 2. The drain 7 reduces the generation of vortices and air entrainment at the water collection opening 2b. The drain 7 may contribute to the generation of a siphon effect. The drain 7 may have a well-known configuration.

[0017] The vertical pipe 3 defines the vertical flow path (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 central axis C3 of the vertical pipe 3 is circular. The vertical pipe 3 is positioned so that the direction of the central axis C3 of the vertical pipe 3 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 31a, 31b, and 31c. 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 connects to the bent pipe 5 (the lower end in Figure 1). For 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) of JIS K 6741 "Rigid Polyvinyl Chloride Pipe". In this embodiment, a portion of the downstream side of the vertical pipe 3 is located underground, and the connection part with the bent pipe 5 may also be underground.

[0018] The horizontal pipe 4 defines a flow path (drainage route) that intersects the vertical direction. In a rain gutter system, the horizontal pipe 4 is also called a connecting pipe or horizontal pipe. In this embodiment, the horizontal pipe 4 is located between the vertical pipe 3 and the drain pit 21. If the drain pit 21 is buried underground, the horizontal pipe 4 in this embodiment may also be buried underground. The horizontal pipe 4 is straight. The cross-section perpendicular to the central axis C4 of the horizontal pipe 4 is circular. In Figure 1, the horizontal pipe 4 is fixed so that the direction of the central axis C4 of the horizontal pipe 4 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 bent pipe 5 (the right end in Figure 1). The downstream end 4b is the end of the horizontal pipe 4 that is inserted into the drain pit 21 (the left 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".

[0019] The bent pipe 5 is a connecting joint that connects drainage routes with different directions, such as vertical and horizontal pipes. In Figure 1, the bent pipe 5 connects the downstream end 3b of the vertical pipe 3 to the upstream end 4a of the horizontal pipe 4. The bent pipe 5 has first and second sockets 5a and 5b for connecting piping members such as the vertical pipe 3 and the horizontal pipe 4 to the bent pipe 5, and a bent section 5c that connects the first and second sockets 5a and 5b. In Figure 1, the first socket 5a receives the vertical pipe 3, and the second socket 5b receives the horizontal pipe 4. The angle between the central axes of the first and second sockets 5a and 5b is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage". As an example, the material of the bent pipe 5 is, for example, rigid polyvinyl chloride. The dimensions of the bent pipe 5 may be set, for example, in accordance with the standard JIS K 6739 "Fittings for rigid polyvinyl chloride pipes for drainage". The bent pipe 5 may be a 90° bend elbow (so-called DL) as defined in JIS K 6739.

[0020] The projection member 6-1 is located inside the horizontal pipe 4, and the projection member 6-2 is located inside the vertical pipe 3, and is used to partially reduce the cross-sectional area of ​​the flow path of the vertical pipe 3 and the horizontal pipe 4. In particular, the projection member 6-1 is located inside the horizontal pipe 4 at the upstream end 4a, which is the end on the side of the bent pipe 5, and the projection member 6-2 is located inside the vertical pipe 3 at the downstream end 3b, which is the end on the side of the bent pipe 5. In the piping system 1, the vertical pipe 3 is a straight pipe located upstream of the bent pipe 5 that changes the direction of the flow path, and the horizontal pipe 4 is a straight pipe located downstream of the bent pipe 5 that changes the direction of the flow path. The projection member 6-1 is a first projection member located inside the horizontal pipe 4, making at least a portion of it a straight pipe. In this embodiment, at least a portion of the horizontal pipe 4 is the entire horizontal pipe 4. The projection member 6-2 is a second projection member located inside the vertical pipe 3, making at least a portion of it a straight pipe. In this embodiment, at least a portion of the vertical pipe 3 is the entire vertical pipe 3.

[0021] The protruding members 6-1 and 6-2, together with the horizontal pipe 4 and vertical pipe 3, which are straight pipes on which the protruding members 6-1 and 6-2 are arranged, constitute piping members 8-1 and 8-2 (hereinafter referred to as piping member 8 when there is no need to distinguish between them). More specifically, piping member 8-1 comprises the protruding member 6-1 and the horizontal pipe 4. Piping member 8-2 comprises the protruding member 6-2 and the vertical pipe 3.

[0022] The protruding members 6-1 and 6-2 have the same configuration. Therefore, although the piping members 8-1 and 8-2 differ in that they have a horizontal pipe 4 and a vertical pipe 3, they are essentially the same configuration. A person skilled in the art can easily understand that the description of piping member 8-1 is a description of piping member 8-2 by replacing the description relating to the horizontal pipe 4 of piping member 8-1 with the description relating to the vertical pipe 3 of piping member 8-2.

[0023] Figure 2 is a perspective view of an example configuration of the piping member 8-1, and Figure 3 is an exploded perspective view of the piping member 8-1. As can be seen from Figures 2 and 3, the piping member 8-1 comprises a horizontal pipe 4 and a projection member 6-1.

[0024] As shown in Figure 3, the projection member 6-1 has a size that allows it to be placed inside the horizontal pipe 4, i.e., it has a length, width, and height (thickness). The material of the projection member 6-1 is, for example, rigid polyvinyl chloride.

[0025] The projection member 6-1 has a first end 6a and a second end 6b. The first end 6a and the second end 6b are the ends of the projection member 6-1 in the longitudinal direction. The longitudinal direction of the projection member 6-1 corresponds to the flow direction of rainwater flowing through the horizontal pipe 4. The flow direction of rainwater flowing through the horizontal pipe 4 coincides with the direction of the central axis C4 of the horizontal pipe 4. The first end 6a is directed toward the end side of the horizontal pipe 4 that is connected to the bent pipe 5 (the upstream side in the horizontal pipe 4), and the second end 6b is directed toward the end side of the horizontal pipe 4 that is not connected to the bent pipe 5 (the downstream side in the horizontal pipe 4). In the projection member 6-1, a flow of rainwater is generated from the first end 6a toward the second end 6b.

[0026] Figure 4 is a cross-sectional view of piping member 8-1. Figure 5 is a cross-sectional view taken along line AA of Figure 4. Figure 6 is a cross-sectional view of piping member 8-1 with a portion cut out. Figure 7 is a plan view of piping member 8-1. Figure 8 is a bottom view of piping member 8-1. Figure 9 is a cross-sectional view taken along line IX-IX of Figure 5. Figure 10 is a cross-sectional view taken along line XX of Figure 5. Figure 11 is a cross-sectional view taken along line XI-XI of Figure 5. Figure 12 is a cross-sectional view taken along line XII-XII of Figure 5. Figure 13 is a cross-sectional view taken along line XIII-XIII of Figure 5.

[0027] As shown in Figure 4, the projection member 6-1 has a contact surface 60 that contacts the inner circumferential surface 40a of the horizontal pipe 4. As shown in Figures 7 and 8, the contact surface 60 is convex when viewed from the direction of the central axis C4 of the horizontal pipe 4. The radius of curvature of the contact surface 60 is set based on the radius of curvature of the inner circumferential surface 40a so that there is no substantial gap between the contact surface 60 and the inner circumferential surface 40a of the horizontal pipe 4.

[0028] The protruding member 6-1 is positioned to project from the first wall surface 40b on the inner circumference side of the horizontal pipe 4 toward the second wall surface 40c on the outer circumference side of the horizontal pipe 4. The first wall surface 40b is the inner circumference side portion of the bent pipe 5 on the inner circumference surface 40a of the horizontal pipe 4 (for example, half of the inner circumference side). The second wall surface 40c is the outer circumference side portion of the bent pipe 5 on the inner circumference surface 40a of the horizontal pipe 4 (for example, half of the outer circumference side). The inner circumference surface 40a is composed of the first wall surface 40b and the second wall surface 40c.

[0029] As shown in Figures 4 to 8, the projection member 6-1 has a main surface 61 and first and second side surfaces 62 and 63. The main surface 61 and the first and second side surfaces 62 and 63 are on the opposite side of the projection member 6-1 from the contact surface 60 and can come into contact with rainwater flowing inside the horizontal pipe 4. As shown in Figures 4 to 6, the main surface 61 extends from the first end 6a to the second end 6b. As shown in Figures 7 and 8, the main surface 61 faces the center of the horizontal pipe 4 when viewed from the direction of the central axis C4 of the horizontal pipe 4. The first and second side surfaces 62 and 63 are on both sides of the main surface 61 when viewed from the direction of the central axis C4 of the horizontal pipe 4. In Figure 7, the first side surface 62 is on the left side of the main surface 61 and the second side surface 63 is on the right side of the main surface 61.

[0030] On the projection member 6-1, the main surface 61 and the first and second sides 62 and 63 can come into contact with the rainwater flowing inside the horizontal pipe 4. As shown in Figure 5, the projection member 6-1 causes a flow F1 along the main surface 61, a flow F2 along the first side 62, and a flow F3 along the second side 63. Since the main surface 61 and the first and second sides 62 and 63 can come into contact with rainwater, it is preferable that the surface roughness of the main surface 61 and the first and second sides 62 and 63 be small, as this can be expected to improve the flow rate.

[0031] The projection member 6-1 has a first separation wall 64 to facilitate the separation of flow F1 and flow F2. The presence of the first separation wall 64 makes it easier for flow F2 to separate from flow F1. The first separation wall 64 is located between the main surface 61 and the first side surface 62. In this embodiment, the first separation wall 64 is the boundary portion between the main surface 61 and the first side surface 62. In other words, the boundary portion between the main surface 61 and the first side surface 62 constitutes a wall between the flow path with the main surface 61 as its bottom surface and the flow path with the first side surface 62 as its bottom surface. The first separation wall 64 can be formed by both the main surface 61 and the first side surface 62 having a concave shape.

[0032] The projection member 6-1 has a second separation wall 65 to facilitate the separation of flow F1 and flow F3. The presence of the second separation wall 65 makes it easier for flow F3 to separate from flow F1. The second separation wall 65 is located between the main surface 61 and the second side surface 63. In this embodiment, the second separation wall 65 is the boundary portion between the main surface 61 and the second side surface 63. In other words, the boundary portion between the main surface 61 and the second side surface 63 constitutes a wall between the flow path with the main surface 61 as its bottom surface and the flow path with the second side surface 63 as its bottom surface. The second separation wall 65 can be formed by both the main surface 61 and the second side surface 63 having a concave shape.

[0033] As can be seen from Figures 4, 5, and 7-13, the shape (cross-sectional shape) of the projection member 6-1, as viewed from the direction of the central axis C4 of the horizontal pipe 4, changes along the direction of the central axis C4 of the horizontal pipe 4.

[0034] As shown in Figure 4, the height of the projection member 6-1 varies along the direction of the central axis C4 of the horizontal pipe 4. In this embodiment, the projection member 6-1 has a top 6c between the first end 6a and the second end 6b. The top 6c is the tallest part of the projection member 6-1. The height of the projection member 6-1 increases monotonically from the first end 6a towards the top 6c. The height of the projection member 6-1 decreases monotonically from the top 6c towards the second end 6b. At the top 6c, the projection member 6-1 minimizes the flow path cross-sectional area of ​​the horizontal pipe 4.

[0035] As shown in Figure 4, in a cross-section perpendicular to the width direction of the protruding member 6-1, the main surface 61 includes a curved shape that protrudes towards the second wall surface 40c of the horizontal pipe 4 at its top 6c. This improves the flow rate. From another viewpoint, the main surface 61 only needs to have a shape that protrudes toward the second wall surface 40c so as to produce a Coanda effect downstream of the bent pipe 5. In other words, the main surface 61 only needs to have a shape that produces a Coanda effect downstream of the bent pipe 5. This allows for miniaturization while improving the flow rate.

[0036] As can be seen from Figures 7 to 13, the shape of the main surface 61, as viewed from the direction of the central axis C4 of the horizontal pipe 4, changes along the direction of the central axis C4 of the horizontal pipe 4.

[0037] From Figures 7 and 9, when viewed from the direction of the central axis C4 of the horizontal pipe 4, at least a portion of the main surface 61 is concave. At least a portion of the main surface 61 is the portion on the first end 6a side of the main surface 61. In other words, the main surface 61 is concave at the first end 6a. When viewed from the direction of the central axis C4 of the horizontal pipe 4, the radius of curvature of at least a portion of the main surface 61 (the first end 6a) is less than or equal to the radius of curvature of the inner circumferential surface 40a of the horizontal pipe 4. This reduces the pressure loss at the protruding member 6-1.

[0038] As shown in Figures 7 to 11, the main surface 61 is concave at the first end 6a, but convex at the second end 6b. In other words, the shape of the main surface 61 as viewed from the direction of the central axis C4 of the horizontal pipe 4 changes from concave to convex from the first end 6a to the second end 6b. This makes it easier for flow to occur along the main surface 61 of the projection member 6-1. In this embodiment, as shown in Figure 11, the shape of the main surface 61 as viewed from the direction of the central axis C4 of the horizontal pipe 4 is convex at the top 6c. The shape of the main surface 61 as viewed from the direction of the central axis C4 of the horizontal pipe 4 is convex in the range from the top 6c to the second end 6b. In this embodiment, the projection member 6-1 has a flat portion 6d between the first end 6a and the top 6c. As shown in Figure 10, in the flat portion 6d, the main surface 61 is planar as viewed from the direction of the central axis C4 of the horizontal pipe 4.

[0039] Within the concave shape of the main surface 61, the center of the concave shape of the main surface 61, that is, the lowest point of the concave shape, is located closer to the center than the edge in the width direction of the projection member 6-1. Within the convex shape of the main surface 61, the center of the convex shape of the main surface 61, that is, the highest point of the convex shape, is located closer to the center than the edge in the width direction of the projection member 6-1. In this embodiment, the center of the convex shape of the main surface 61 coincides with the center of the projection member 6-1 in the width direction.

[0040] As can be seen from Figures 7 to 13, the shapes of the first side surface 62 and the second side surface 63, as viewed from the direction of the central axis C4 of the horizontal pipe 4, change along the direction of the central axis C4 of the horizontal pipe 4.

[0041] From Figures 7 and 9, when viewed from the direction of the central axis C4 of the horizontal pipe 4, at least a portion of the first side surface 62 is concave. At least a portion of the first side surface 62 is the portion on the first end 6a side of the first side surface 62. In other words, the first side surface 62 is concave at the first end 6a. This reduces the pressure loss at the protruding member 6-1.

[0042] From Figures 7 and 9, when viewed from the direction of the central axis C4 of the horizontal pipe 4, at least a portion of the second side surface 63 is concave. At least a portion of the second side surface 63 is the portion on the first end 6a side of the second side surface 63. In other words, the second side surface 63 is concave at the first end 6a. This reduces the pressure loss at the protruding member 6-1.

[0043] The shape of the first side surface 62, as viewed from the direction of the central axis C4 of the horizontal pipe 4, remains concave from the first end 6a to the second end 6b. As can be seen from Figures 11 to 13, the depth of the concave shape of the first side surface 62 decreases as it moves from the top 6c to the second end 6b. This allows the flow F2 along the first side surface 62 to smoothly merge with the flow F1 along the main surface 61 downstream of the projection member 6-1.

[0044] The shape of the second side surface 63, as viewed from the direction of the central axis C4 of the horizontal pipe 4, remains concave from the first end 6a to the second end 6b. As can be seen from Figures 11 to 13, the depth of the concave shape of the second side surface 63 decreases as it moves from the top 6c to the second end 6b. This allows the flow F3 along the second side surface 63 to smoothly merge with the flow F1 along the main surface 61 downstream of the projection member 6-1.

[0045] Refer to Figure 5. In the projection member 6-1, the first side surface 62 and the second side surface 63 are symmetrical with respect to the center line of the projection member 6-1 along the central axis C4 of the horizontal pipe 4. This improves the flow rate.

[0046] As shown in Figure 5, the width of the projection member 6-1 changes along the direction of the central axis C4 of the horizontal pipe 4. The width of the projection member 6-1 refers to the width at the part of the projection member 6-1 closest to the inner circumferential surface 40a of the horizontal pipe 4. In this embodiment, the width of the projection member 6-1 corresponds to the width of the contact surface 60 of the projection member 6-1. The projection member 6-1 has a first section 6e, a second section 6f, and a third section 6g between the first end 6a and the second end 6b, where the direction of the width change changes. The first section 6e is located between the first end 6a and the top 6c, more specifically, the flat section 6d. The second section 6f is located between the top 6c and the second end 6b. The third section 6g is located between the second section 6f and the second end 6b. The width of the projection member 6-1 increases monotonically from the first end 6a toward the first section 6e. The width of the projection member 6-1 decreases monotonically from the first section 6e to the second section 6f. The width of the projection member 6-1 increases monotonically from the second section 6f to the third section 6g. The width of the projection member 6-1 decreases monotonically from the third section 6g to the second end 6b. The width of the projection member 6-1 is largest at the first section 6e. As shown in Figure 7, let W1 be the maximum width of the projection member 6-1 (width at the first section 6e) as viewed from the direction of the central axis C4 of the horizontal pipe 4. If the inner diameter of the horizontal pipe 4 is d, then 0.5d ≤ W1 ≤ 0.9d. Here, if W2 is the maximum distance between the first separation wall 64 and the second separation wall 65 as viewed from the direction of the central axis C4 of the horizontal pipe 4, then 0.3d ≤ W2 ≤ 0.7d. W2 ≤ W1.

[0047] The main surface 61 narrows in width from the first end 6a to the top 6c, at least from the first end 6a to the top 6c, as it moves from the first end 6a to the second end 6b. This configuration allows the flows F2 and F3 along the first side surface 62 and the second side surface 63 to smoothly merge with the flow F1 along the main surface 61 downstream of the projection member 6-1. In this embodiment, the width of the main surface 61 decreases monotonically from the first end 6a to the second end 6b.

[0048] The first side surface 62 includes a portion that widens from the first end 6a towards the second end 6b. More specifically, the portion of the first side surface 62 on the first end 6a side widens from the first end 6a towards the second end 6b. This configuration can reduce pressure loss. In this embodiment, the portion of the first side surface 62 on the first end 6a side includes the portion of the first side surface 62 from the first end 6a to the flat portion 6d.

[0049] The second side surface 63 includes a portion that widens from the first end 6a towards the second end 6b. More specifically, the portion of the second side surface 63 on the first end 6a side widens from the first end 6a towards the second end 6b. This configuration can reduce pressure loss. In this embodiment, the portion of the second side surface 63 on the first end 6a side includes the portion of the second side surface 63 from the first end 6a to the flat portion 6d.

[0050] The first separation wall 64 and the second separation wall 65 are formed on a portion of the projection member 6-1, rather than the entire projection member 6-1, in the direction of the central axis C4 of the horizontal pipe 4. More specifically, the first separation wall 64 and the second separation wall 65 are located within a predetermined range along the direction of the central axis C4 of the horizontal pipe 4, starting from the first end 6a. The predetermined range is from the first end 6a to the flat portion 6d.

[0051] The distance between the first separation wall 64 and the second separation wall 65 decreases as you move from the first end 6a to the second end 6b. This configuration separates the flow F1 along the main surface 61 from the flows F2 and F3 along the first side surface 62 and the second side surface 63 upstream of the projection member 6-1, and allows the flows F2 and F3 along the first side surface 62 and the second side surface 63 to smoothly merge with the flow F1 along the main surface 61 downstream of the projection member 6-1.

[0052] The heights of the first separation wall 64 and the second separation wall 65 decrease from the first end 6a to the second end 6b. This configuration separates the flow F1 along the main surface 61 from the flows F2 and F3 along the first side surface 62 and the second side surface 63 upstream of the projection member 6-1, and allows the flows F2 and F3 along the first side surface 62 and the second side surface 63 to smoothly merge with the flow F1 along the main surface 61 downstream of the projection member 6-1.

[0053] Refer to Figures 4 and 11. Let d be the diameter of the horizontal pipe 4, and L be the distance between the first end 6a and the second end 6b in the direction of the central axis C4 of the horizontal pipe 4 (i.e., the length of the projection member 6-1). For the projection member 6-1, it is preferable that 0.5d ≤ L ≤ 5.0d. This can further reduce the occurrence of pressure loss due to separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0054] Refer to Figure 4. The top 6c of the projection member 6-1 is the part of the piping member 8-1 where the flow path cross-sectional area is minimized. Let L1 be the distance between the first end 6a and the top 6c in the direction of the central axis C4 of the horizontal pipe 4. It is preferable that 0.1L ≤ L1 ≤ 0.5L in the projection member 6-1. This can further reduce the occurrence of pressure loss due to separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0055] Refer to Figure 4. Let L2 be the distance between the top 6c and the second end 6b in the direction of the central axis C4 of the horizontal pipe 4. L2 = L - L1. It is desirable that L2 > L1 in the projection member 6-1. This can further reduce the pressure loss caused by separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0056] Refer to Figure 11. Viewed from the direction of the central axis C4 of the horizontal pipe 4, let D1 be the distance between the top 6c of the projection member 6-1 and the second wall surface 40c. It is desirable that 0.60d ≤ D1 ≤ 0.95d be the case for the projection member 6-1. This further reduces pressure loss caused by separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0057] When viewed from the direction of the central axis C4 of the horizontal pipe 4, let H1 be the height of the top 6c of the projection member 6-1. H1 = d - D1. It is desirable that 0.05d ≤ H1 ≤ 0.40d be the case for the projection member 6-1. This can further reduce the pressure loss caused by separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0058] Let A be the maximum flow path cross-sectional area of ​​the horizontal pipe 4. The maximum flow path cross-sectional area A is obtained from the inner diameter d of the horizontal pipe 4. That is, A = π(d / 2)². Let A1 be the cross-sectional area of ​​the projection member at the top 6c. It is desirable that A1 / A ≤ 0.4 for projection member 6-1. This can further reduce the occurrence of pressure loss caused by separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization. Let A2 be the minimum value of the flow path cross-sectional area of ​​piping member 8-1. A2 is the flow path cross-sectional area at the top 6c of projection member 6-1. A2 = A - A1. It is desirable that 0.6 ≤ A2 / A < 1 for projection member 6-1. This can further reduce the occurrence of pressure loss caused by separation downstream from the bent pipe 5. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0059] As shown in Figures 4, 6, and 7, the projection member 6-1 has a contact end face 66 at its first end 6a. In this embodiment, the inner diameter of the horizontal pipe 4 is larger than the inner diameter of the bent portion 5c of the bent pipe 5. The contact end face 66 is provided to bridge the difference in inner diameter between the horizontal pipe 4 and the bent portion 5c of the bent pipe 5. As shown in Figure 4, the presence of the contact end face 66 can reduce the step difference between the inner circumferential wall surface 50a of the bent portion 5c of the bent pipe 5 and the main surface 61 of the projection member 6-1. This makes it less likely for the fluid flow from the bent pipe 5 to the piping member 8-1 to be obstructed.

[0060] As shown in Figure 7, the projection member 6-1 has projections 67. The projections 67 are used for connecting or positioning the horizontal pipe 4 and the projection member 6-1. The projections 67 are positioned on the contact surface 60. The projections 67 are shaped to fit into the recesses 4c of the horizontal pipe 4. In this embodiment, the horizontal pipe 4 has a pair of recesses 4c on the edge of the upstream end 4a. The recesses 4c are formed as notches. The projection member 6-1 is provided with a pair of projections 67 that fit into the pair of recesses 4c, respectively. By fitting the pair of projections 67 into the pair of recesses 4c, the projection member 6-1 is positioned relative to the horizontal pipe 4.

[0061] As shown in Figure 14, the horizontal pipe 4 further has a mark 80. The mark 80 indicates the position of the projection member 6. In Figure 14, the mark 80 is positioned on the upstream end side of the outer circumferential surface of the horizontal pipe 4, along the center line C6 connecting the center of the first end 6a and the center of the second end 6b of the projection member 6. In this embodiment, when the horizontal pipe 4 is connected to the bent pipe 5, the mark 80 is positioned on the outer circumferential surface of the horizontal pipe 4 in a position that is not covered by the second receiving opening 5b of the bent pipe 5. However, when the horizontal pipe 4 is connected to the bent pipe 5, the mark 80 may be positioned on the outer circumferential surface of the horizontal pipe 4 in a position that is hidden by the second receiving opening 5b of the bent pipe 5. Also, the mark 80 in Figure 14 is an arrow and can indicate the direction in which the horizontal pipe 4 is connected to the bent pipe 5. The mark 80 may be a letter, figure, symbol, three-dimensional shape, or color, or a combination thereof, that is recognizable by human perception. The Mark 80 makes it possible to identify the center line of the protruding member 6, which may be located inside the horizontal pipe 4 and not visible from the outside, thereby facilitating installation work.

[0062] In the piping member 8-1 described above, the projection member 6-1 is positioned on the inner circumferential surface 40a of the horizontal pipe 4. As a result, the flow path cross-sectional area of ​​the piping member 8-1 is not constant, and there are areas where the flow path cross-sectional area of ​​the piping member 8-1 is smaller than the cross-sectional area of ​​the horizontal pipe 4. The projection member 6-1 is located on the upstream end 4a side of the horizontal pipe 4 rather than the downstream end 4b side of the horizontal pipe 4. In this embodiment, the projection member 6-1 is located on the upstream end 4a of the horizontal pipe 4. In other words, the projection member 6-1 reduces the flow path at the upstream end 4a of the horizontal pipe 4 that connects to the bent pipe 5.

[0063] Next, the function of the projection member 6-1 in the piping member 8-1 will be explained. The projection member 6-1 is located inside the horizontal pipe 4, which is positioned downstream of the bent pipe 5. The bent pipe 5 allows water flowing in from the vertical pipe 3 to flow into the horizontal pipe 4. If the direction of water flow changes significantly in the bent pipe 5, pressure loss due to separation can be one of the causes of a decrease in flow rate.

[0064] Figure 15 is a simulation of the pressure distribution in the comparative example piping member 100. The comparative example piping member 100 differs from piping member 8-1 in that it does not have the protruding member 6-1. In Figure 15, darker colors indicate lower pressure. In particular, the pressure loss is large at the location indicated by R in Figure 15, and the existence of such a location with large pressure loss can be a major factor in the decrease in flow rate. The pressure loss at the location indicated by R in Figure 15 is thought to be due to separation. This separation is caused by the water separating from the first wall surface 40b of piping member 100 downstream from the inner circumferential wall surface 50a of the bent pipe 5. In other words, as indicated by the arrow F in Figure 15, the water flowing in from the upstream side initially flows along the pipe wall 200, but after the inner circumferential wall surface 50a of the bent pipe 5, it may separate from the first wall surface 40b of piping member 100. Such separation is particularly noticeable when the water flow velocity is high. The higher the flow velocity, the wider the area over which pressure loss occurs tends to be.

[0065] Next, we will further explain the sizes and other details of each component in piping system 1.

[0066] When considering its use in a high-drainage system utilizing the siphon effect, the size of the vertical pipe 3 is preferably 75 mm, 100 mm, or 125 mm in nominal diameter. In addition to the above nominal diameters, the size of the vertical pipe 3 may be any size set by the manufacturer or supplier of piping, such as 76 mm, 89 mm, 114 mm, or 140 mm.

[0067] The length of the vertical pipe 3 and horizontal pipe 4 on which the projection member 6 is placed, in the direction of the central axis, is preferably greater than or equal to the distance L between the first end 6a and the second end 6b of the projection member 6, considering the placement of the projection member 6. Furthermore, when the vertical pipe 3 or horizontal pipe 4 is treated as a single piping member (straight pipe) incorporating the projection member 6, which constitutes part of the piping system, the length in the direction of the central axis is preferably 4m or less for ease of handling.

[0068] The bent pipe 5 is connected to the upstream end 4a of the horizontal pipe 4 leading to the drain pit 21. In other words, because it is located close to the ground 20 of the piping system 1, the flow velocity can be particularly high. As a result, a large pressure loss occurs, and the impact when rainwater hits the bend 5c of the bent pipe 5 can also be large. In particular, the smaller the radius of the bend 5c, the less the impact on the bend 5c is dispersed, which can increase the impact and the risk of failure. In this embodiment, because the protruding members 6-1 and 6-2 are arranged, the pressure loss is reduced, and the decrease in flow velocity in the bent pipe 5 is reduced. This makes it possible to reduce the impact when rainwater hits the bend 5c of the bent pipe 5. Therefore, the risk of failure of the bend 5c can be reduced.

[0069] In this embodiment, the piping member 8-1 has a projection member 6-1. The presence of the projection member 6-1 is expected to (1) make it easier for water to flow along the pipe wall than in the absence of the projection member 6-1, and (2) reduce the number of areas where pressure loss may occur. Therefore, the projection member 6-1 can reduce the occurrence of pressure loss due to separation downstream from the bent pipe 5 and improve the flow rate. Unlike the technology described in Patent Document 1, the piping member 8-1 can be miniaturized simply by having the projection member 6-1, as it does not require increasing the radius of curvature of the inner surface on the inner side of the bent pipe 5 connected to the upstream end 4a of the horizontal pipe 4 leading to the drain pit 21. In the prior art, it was difficult to miniaturize the bent pipe 5 considering the impact on the bent section 5c, but with this embodiment, the impact on the bent section 5c can be reduced even when the bent pipe 5 is miniaturized. Therefore, the projection member 6-1 can reduce the impact on the piping while enabling miniaturization. The protruding member 6-1 is located inside the horizontal pipe 4, making it less conspicuous when viewed as part of the entire piping system 1. This is expected to improve the overall aesthetic appearance of the piping system 1.

[0070] In piping system 1, there is a range downstream of the bent pipe 5 where pressure loss due to delamination is likely to occur. The projection member 6-2 is located inside the vertical pipe 3 at the end on the bent pipe 5 side (downstream end 3b). In particular, the projection member 6-2 is located on the inner circumference side of the bent pipe 5 in the vertical pipe 3 (left side in Figure 1). At the projection member 6-2, the top 6c is closer to the first end 6a than the second end 6b, and the first end 6a is closer to the bent pipe 5 than the second end 6b. At the projection member 6-2, rainwater flows from the second end 6b towards the first end 6a. The presence of the projection member 6-2 allows water to be guided to the range downstream of the bent pipe 5 where pressure loss due to delamination is likely to occur. This is expected to reduce the area where pressure loss is likely to occur. Therefore, the projection member 6-2 can reduce the occurrence of pressure loss due to delamination downstream of the bent pipe 5 and improve flow rate. Unlike the technology described in Patent Document 1, the piping member 8-2 only requires the protruding member 6-2 to be equipped with a projection member 6-2, thus eliminating the need to increase the radius of curvature of the inner surface of the bent pipe 5 connected to the upstream end 4a of the horizontal pipe 4 leading to the drain manhole 21, and thus enabling miniaturization. In the prior art, it was difficult to miniaturize the bent pipe 5 considering the impact on the bent section 5c, but with this embodiment, even if the bent pipe 5 is miniaturized, the impact on the bent section 5c can be reduced. Therefore, the projection member 6-2 can reduce the impact on the piping while enabling miniaturization. The projection member 6-2 is located inside the vertical pipe 3, and when viewed as part of the piping system 1, the projection member 6-2 becomes inconspicuous. This is expected to improve the overall aesthetics of the piping system 1.

[0071] As described above, in piping system 1, the bent pipe 5 can be a source of pressure loss within the pipeline. Depending on their shape, the bent pipe 5 generally has a loss coefficient of about 0.3 to 1.5. Here, if the projection member 6 is placed on either the upstream or downstream side of the bent pipe 5, the effect of pressure loss caused by the bent pipe 5 can be reduced. In particular, if the projection member 6 is placed on both the upstream and downstream sides of the bent pipe 5, rainwater will flow along the projection member 6 from the upstream side to the downstream side of the bent pipe 5, allowing rainwater to flow smoothly through the bent channel inside the bent pipe 5, which enables further reduction of pressure loss. Therefore, by placing the projection member 6 on both the upstream and downstream sides of the bent pipe 5 as in piping system 1 in Figure 1, the pressure loss in the bent pipe 5 can be greatly reduced, and the effect of reducing pressure loss can be maximized. Furthermore, the projection member 6 can suppress impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4. This reduces the risk of damage to the bent section 5c.

[0072] [1.1.2. Effects, etc.] The piping system 1 described above comprises a vertical pipe 3, a horizontal pipe 4 located between the downstream end 3b of the vertical pipe 3 and the rainwater drain 21, a bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4 such that the central axis C3 of the vertical pipe 3 and the central axis C4 of the horizontal pipe 4 intersect, and one or more protruding members 6 located inside at least one of the vertical pipe 3 and the horizontal pipe 4 on the end of the bent pipe 5, which partially reduces the cross-sectional area of ​​the flow path. This configuration enables miniaturization while suppressing impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4.

[0073] In piping system 1, the inner diameter of the vertical pipe 3 is between 75 mm and 135 mm. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 that connects the vertical pipe 3 and the horizontal pipe 4.

[0074] In the piping system 1, one or more protruding members 6 have a top 6c between a first end 6a facing the bent pipe 5 and a second end 6b facing away from the bent pipe 5, which minimizes the flow path cross-sectional area. If L is the distance between the first end 6a and the second end 6b in the direction of the central axis of the vertical pipe 3 or horizontal pipe 4 where one or more protruding members 6 are arranged, and L1 is the distance between the first end 6a and the top 6c in the direction of the central axis of the vertical pipe 3 or horizontal pipe 4 where one or more protruding members 6 are arranged, then 0.1L ≤ L1 ≤ 0.5L. If A is the maximum flow path cross-sectional area of ​​the vertical pipe 3 or horizontal pipe 4 where one or more protruding members 6 are arranged, and A1 is the cross-sectional area of ​​one or more protruding members 6 at the top 6c, then A1 / A ≤ 0.4. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4.

[0075] The piping member 8 is a part of a piping system 1 comprising a vertical pipe 3, a horizontal pipe 4 located between the downstream end 3b of the vertical pipe 3 and the rainwater drain 21, and a bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4 such that the central axis C3 of the vertical pipe 3 and the central axis C4 of the horizontal pipe 4 intersect. The piping member 8 comprises a straight pipe that constitutes at least a part of the vertical pipe 3 or the horizontal pipe 4, and a protruding member 6 arranged inside the straight pipe to partially reduce the cross-sectional area of ​​the flow path. This configuration enables miniaturization while suppressing impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4.

[0076] The piping component 8 further includes a bent pipe. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 that connects the vertical pipe 3 and the horizontal pipe 4.

[0077] In the piping member 8, the projection member 6 has a top portion 6c that minimizes the flow path cross-sectional area between a first end 6a facing the bent pipe 5 and a second end 6b facing the opposite side of the bent pipe 5. If L is the distance between the first end 6a and the second end 6b in the direction of the central axis of the straight pipe, and L1 is the distance between the first end 6a and the top portion 6c in the direction of the central axis of the straight pipe, then 0.1L ≤ L1 ≤ 0.5L. If A is the maximum flow path cross-sectional area of ​​the straight pipe, and A1 is the cross-sectional area of ​​the projection member 6 at the top portion 6c, then A1 / A ≤ 0.4. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4.

[0078] In the piping member 8, the length of the straight pipe is greater than or equal to the total length of the projection member 6 and less than or equal to 4 m, the projection member 6 is positioned at one end of the straight pipe, and the inner diameter of the straight pipe is between 75 mm and 135 mm. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 that connects the vertical pipe 3 and the horizontal pipe 4.

[0079] In the piping member 8, the straight pipe has a mark indicating the center line C6 of the projection member 6 at one end of the straight pipe on its outer surface, in a position not covered by the bent pipe 5. This configuration facilitates the installation of the piping member 8.

[0080] [1.2. Embodiment 2] [1.2.1. Structure] Figure 16 is a schematic diagram of an example configuration of piping system 1A according to Embodiment 2. Here, descriptions that overlap with Embodiment 1 are omitted as appropriate. The piping system 1A in Figure 5 comprises a gutter 2, a vertical pipe 3, a horizontal pipe 4, a bent pipe 5, protruding members 6-1, 6-2, and a drain 7. The vertical pipe 3 comprises a first straight pipe 30, a second straight pipe 9, and an increaser 10.

[0081] The first straight pipe 30 defines a vertical flow path (drainage path). In a rain gutter system, the first straight pipe 30 is also called a downpipe. In this embodiment, the first straight pipe 30 is installed to drain rainwater from the water collection port 2b. The first straight pipe 30 allows rainwater from the water collection port 2b to flow vertically. The first straight pipe 30 is straight. The cross-section perpendicular to the central axis C30 of the first straight pipe 30 is circular. The first straight pipe 30 is positioned so that the direction of the central axis C30 of the first straight pipe 30 coincides with the vertical direction. In Figure 16, the first straight pipe 30 is fixed to the wall surface 11b of the building 11 by bracing fittings 31a, 31b, and 31c. The first straight pipe 30 has an upstream end 30a and a downstream end 30b. The upstream end 30a is the end of the first straight pipe 30 that connects to the water collection port 2b (the upper end in Figure 1). The downstream end 30b is the end of the first straight pipe 30 that connects to the second straight pipe 9 (the lower end in Figure 1). For example, the material of the first straight pipe 30 is rigid polyvinyl chloride. The dimensions of the first straight pipe 30, 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".

[0082] The second straight pipe 9 defines the vertical flow path (drainage path). In a rain gutter system, the second straight pipe 9 is also called a downpipe. In this embodiment, the second straight pipe 9 is located between the first straight pipe 30 and the horizontal pipe 4. The second straight pipe 9 is straight. The cross-section perpendicular to the central axis C9 of the second straight pipe 9 is circular. The second straight pipe 9 is positioned such that the direction of the central axis C9 of the second straight pipe 9 coincides with the vertical direction. The second straight pipe 9 has an upstream end 9a and a downstream end 9b. The upstream end 9a is the end of the second straight pipe 9 that connects to the first straight pipe 30 via the increaser 10 (the upper end in Figure 16). The downstream end 9b is the end of the second straight pipe 9 that connects to the bent pipe 5 (the lower end in Figure 1). As an example, the material of the second straight pipe 9 is rigid polyvinyl chloride. The dimensions of the second straight pipe 9, for example, its 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". In this embodiment, the diameter of the second straight pipe 9 is greater than the diameter of the first straight pipe 30. The diameters of the second straight pipe 9 and the horizontal pipe 4 are equal.

[0083] The increaser 10 connects the first straight pipe 30 to the second straight pipe 9. In this embodiment, the central axis C3 of the first straight pipe 30 and the central axis C9 of the second straight pipe 9 coincide. The increaser 10 has first and second sockets 10a and 10b to which the piping members are connected, and a main body 10c that connects the first and second sockets 10a and 10b to each other. The inner diameter of the first socket 10a is smaller than the inner diameter of the second socket 10b, and the inner diameter of the main body 10c gradually increases from the first socket 10a to the second socket 10b. In the increaser 10, the downstream end 30b of the first straight pipe 30 is connected to the first socket 10a, and the upstream end 9a of the second straight pipe 9 is connected to the second socket 10b. As an example, the material of the increaser 10 is rigid polyvinyl chloride. The dimensions of the increaser 10 may be set, for example, in accordance with the JIS K 6739 standard for "rigid polyvinyl chloride pipe fittings for drainage".

[0084] When considering use in a high-drainage system utilizing the siphon effect, the size of the first straight pipe 30 is preferably 75 mm, 100 mm, or 125 mm in nominal diameter. The size of the second straight pipe 9 is preferably 100 mm, 125 mm, or 150 mm in nominal diameter. In particular, considering the need to accommodate high flow rates, it is preferable that the second straight pipe 9 be at least one size larger than the first straight pipe 30. The sizes of the first straight pipe 30 and the second straight pipe 9 can be any size set by the manufacturer or other company that sells piping, such as 76 mm, 89 mm, 114 mm, or 140 mm.

[0085] In piping system 1A, the projection member 6-2 is located inside the second straight pipe 9 and is used to partially reduce the flow path cross-sectional area of ​​the second straight pipe 9. In particular, the projection member 6-2 is positioned inside the second straight pipe 9 at the downstream end 9b, which is the end on the side of the bent pipe 5. In piping system 1A, the second straight pipe 9 is a straight pipe positioned upstream of the bent pipe 5 that changes the direction of the flow path. The projection member 6-2 is a second projection member that is positioned so that at least a portion of the second straight pipe 9 is a straight pipe. In this embodiment, at least a portion of the second straight pipe 9 is the entire second straight pipe 9. The projection member 6-2, together with the second straight pipe 9 on which the projection member 6-2 is positioned, constitutes piping member 8-2A. More specifically, piping member 8-2A comprises the projection member 6-2 and the second straight pipe 9.

[0086] The projection member 6-2 is the same in both the piping member 8-2 described in Embodiment 1 and the piping member 8-2A in Embodiment 2. Therefore, although piping members 8-2 and 8-2A differ in that they have a vertical pipe 3 and a second straight pipe 9, they are substantially the same in structure. A person skilled in the art can easily understand that the description of piping member 8-2 described in Embodiment 1 is a description of piping member 8-2A by replacing the description related to the vertical pipe 3 of piping member 8-2 with the description related to the second straight pipe 9 of piping member 8-2A.

[0087] In the piping system 1A described above, rainwater flows into the first inlet 10a of the increaser 10 via the downstream end 30b of the first straight pipe 30. The flow path cross-sectional area is enlarged when the rainwater that has flowed in from the first inlet 10a flows out into the second straight pipe 9 via the second inlet 10b. The horizontal pipe 4 is located downstream of the bent pipe 5, and rainwater flows from the second straight pipe 9 through the bent pipe 5 into the horizontal pipe 4 from the downstream end 9b of the second straight pipe 9.

[0088] In this embodiment, a projection member 6-2 is arranged inside the second straight pipe 9, and the projection member 6-2 generates flows F1, F2, and F3 along the projection member 6-2. The projection member 6-2 can be expected to have the same effects as in Embodiment 1. Furthermore, by increasing the cross-sectional area of ​​the flow path when rainwater is discharged from the first straight pipe 30 to the second straight pipe 9 via the increaser 10, the flow velocity of rainwater in the flow path after the second straight pipe 9 can be reduced, and a reduction in the impact on the bent portion 5c of the bent pipe 5 can be expected. In addition, as the cross-sectional area of ​​the flow path increases, a reduction in the impact per unit area on the bent portion 5c of the bent pipe 5 can be expected.

[0089] [1.2.2. Effects, etc.] The piping system 1A described above comprises a vertical pipe 3 which includes a first straight pipe 30, a second straight pipe 9 located downstream of the first straight pipe 30 and having a larger inner diameter than the first straight pipe 30, and an increaser 10 connecting the first straight pipe 30 and the second straight pipe 9. One or more protruding members 6 are located inside at least one of the second straight pipe 9 and the horizontal pipe 4. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 connecting the vertical pipe 3 and the horizontal pipe 4.

[0090] In piping system 1A, the inner diameter of the first straight pipe 30 is between 75 mm and 135 mm. This configuration allows for miniaturization while suppressing impact on the bent pipe 5 that connects the vertical pipe 3 and the horizontal pipe 4.

[0091] [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. Modifications of the embodiments are shown below. The modifications described below can be combined and applied as appropriate.

[0092] In one modified example, the first side surface 62 and the second side surface 63 of the projection member 6-1 may have shapes that are asymmetrical with respect to the center line of the projection member 6-1 along the central axis C4 of the horizontal pipe 4. Depending on the installation environment of the piping system 1 or the piping member 8-1, the shapes of the first side surface 62 and the second side surface 63 may be set individually, and do not necessarily have to be symmetrical with respect to the center line of the projection member 6-1 along the central axis C4 of the horizontal pipe 4.

[0093] In one modified example, the projection member 6-1 does not necessarily need to have a contact end face 66.

[0094] In one modified example, the shape, number, and arrangement of the protrusions 67 of the projection member 6-1 may be appropriately changed according to the shape, number, and arrangement of the recesses 4c of the horizontal pipe 4. The recesses 4c may be holes rather than notches. The position of the recesses 4c is not limited to the edge of the upstream end 4a. It is preferable that the protrusions 67 and recesses 4c are provided in such a way as to facilitate the positioning of the projection member 6-1 relative to the horizontal pipe 4. However, the projection member 6-1 does not necessarily need to have protrusions 67.

[0095] In one modified example, the projection member 6-1 may not be a separate member from the horizontal pipe 4, but may be integrally formed with the horizontal pipe 4. This is equivalent to the inner circumferential surface 40a of the horizontal pipe 4 including the main surface 61 and the first and second side surfaces 62, 63 of the projection member 6-1.

[0096] In one modified example, the protruding members 6-1 and 6-2 do not necessarily have the same configuration or structure. For example, at least one of the protruding members 6-1 and 6-2 may satisfy one or more of the following conditions: 0.1L ≤ L1 ≤ 0.5L, A1 / A ≤ 0.4, or 0.5d ≤ L ≤ 5.0d.

[0097] In one modified example, the protruding members 6-1 and 6-2 do not necessarily have to be the same shape and dimensions; they may be different. In other words, the shape and dimensions of the protruding members 6-1 and 6-2 may be set appropriately depending on the location where they are placed.

[0098] In one modified example, the entire projection member 6-1 does not need to be contained within the horizontal pipe 4. In particular, the second end 6b of the projection member 6-1 may protrude outward from the horizontal pipe 4.

[0099] In one modified example, the material of the protruding member 6-1 does not necessarily have to be rigid polyvinyl chloride. The material of the protruding member 6-1 may be determined according to the requirements of the piping system 1, and may be a synthetic resin such as polyethylene, for example. Alternatively, the material of the protruding member 6-1 may be metal instead of a synthetic resin.

[0100] In one modified example, the shape and size of some or all of the piping systems 1 and 1A may differ from those of the above embodiment. For example, unlike the above embodiment, in piping systems 1 and 1A, the shape of the vertical pipe 3, the shape of the bent pipe 5, the shape of the first straight pipe 30, the shape of the horizontal pipe 4, and the shape of the second straight pipe 9 may be polygonal rather than circular.

[0101] In one modified example, the piping systems 1 and 1A do not necessarily have to be equipped with a gutter 2. For example, if the building 11 has a structure that includes a water collection outlet such as a balcony, the vertical pipe 3 of the piping system 1 may be connected to the water collection outlet of the building 11.

[0102] In one modified example, the drain 7 may be a drain with a structure that is generally considered not to contribute to the occurrence or promotion of the siphon phenomenon. In one modified example, the piping system 1 does not necessarily have to be equipped with the drain 7. The drain 7 is not an essential component of the piping system 1 and may be provided as appropriate considering the installation environment of the piping system 1.

[0103] [3. Appearance] As will be apparent from the above embodiments and modifications, this disclosure includes the following aspects.

[0104] The first embodiment is a piping system comprising a vertical pipe, a horizontal pipe between the downstream end of the vertical pipe and a rainwater drain, a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, and one or more protruding members disposed inside at least one of the vertical pipe and the horizontal pipe on the bent pipe side, which partially reduce the cross-sectional area of ​​the flow path.

[0105] The second embodiment is a piping system based on the first embodiment. The inner diameter of the vertical pipe is between 75 mm and 135 mm.

[0106] A third embodiment is a piping system based on the first embodiment. The vertical pipe comprises a first straight pipe, a second straight pipe located downstream of the first straight pipe and having a larger inner diameter than the first straight pipe, and an increaser connecting the first straight pipe and the second straight pipe, with one or more protruding members located inside at least one of the second straight pipe and the horizontal pipe.

[0107] The fourth aspect is a piping system based on the third aspect. The inner diameter of the first straight pipe is 75 mm or more and 135 mm or less.

[0108] The fifth embodiment is a piping system based on any one of the first to fourth embodiments. One or more projection members have a top that minimizes the flow path cross-sectional area between a first end facing the bent pipe and a second end facing the opposite side of the bent pipe. If L is the distance between the first and second ends in the direction of the central axis of the vertical or horizontal pipe where the one or more projection members are arranged, and L1 is the distance between the first end and the top in the direction of the central axis of the vertical or horizontal pipe where the one or more projection members are arranged, then 0.1L ≤ L1 ≤ 0.5L. If A is the maximum flow path cross-sectional area of ​​the vertical or horizontal pipe where the one or more projection members are arranged, and A1 is the cross-sectional area of ​​the one or more projection members at the top, then A1 / A ≤ 0.4.

[0109] The sixth embodiment is a piping member that constitutes part of a piping system comprising a vertical pipe, a horizontal pipe located between the downstream end of the vertical pipe and a rainwater drain, and a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, the piping member comprising a straight pipe that constitutes at least a part of the vertical pipe or the horizontal pipe, and a projection member disposed inside the straight pipe that partially reduces the cross-sectional area of ​​the flow path.

[0110] The seventh embodiment is a piping member based on the sixth embodiment, further comprising a bent pipe.

[0111] The eighth aspect is a piping member based on the sixth or seventh aspect. The projection member has a top that minimizes the flow path cross-sectional area between a first end facing the bent pipe and a second end facing the opposite side of the bent pipe. If L is the distance between the first and second ends in the direction of the central axis of the straight pipe, and L1 is the distance between the first end and the top in the direction of the central axis of the straight pipe, then 0.1L ≤ L1 ≤ 0.5L. If A is the maximum flow path cross-sectional area of ​​the straight pipe, and A1 is the cross-sectional area of ​​the projection member at the top, then A1 / A ≤ 0.4.

[0112] The ninth embodiment is a piping member based on any one of the sixth to eighth embodiments. The length of the straight pipe is greater than or equal to the total length of the projection member and less than or equal to 4 m, the projection member is located at one end of the straight pipe, and the inner diameter of the straight pipe is between 75 mm and 135 mm.

[0113] The tenth embodiment is a piping member based on any one of the sixth to ninth embodiments. The straight pipe has a mark indicating the center line of the projection member at one end of the straight pipe on its outer surface, in a position not covered by the bent pipe. [Industrial applicability]

[0114] This disclosure is applicable to piping systems and piping components. Specifically, this disclosure is applicable to piping systems that include bent pipes connecting vertical and horizontal pipes, and to piping components used in such piping systems. [Explanation of Symbols]

[0115] 1.1A Piping System 2 eaves gutter 3. Vertical pipe 3a, 30a, 4a, 9a Upstream end 3b, 30b, 4b, 9b Downstream end C3,C30,C4,C9 Center axis 30 1st straight pipe 4 horizontal pipe 5 Bent pipe 5a, 10a First receiving opening 5b, 10b Second undercut 5c Bend part 6, 6-1, 6-2 Protruding members 6a 1st end 6b 2nd end 6c top C6 center line 7 Drain 8, 8-1, 8-2, 8-2A Piping components 80 marks 9 2nd straight pipe 10 Increaser 10c Main body 11 buildings 11a Roof 11b Wall 20 ground 21 Drain manhole 22 Buried pipes

Claims

1. Vertical pipe and A horizontal pipe located between the downstream end of the aforementioned vertical pipe and the rainwater drain, A bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, One or more protruding members are provided inside at least one of the vertical pipes and horizontal pipes, positioned at the end of the bent pipe, to partially reduce the cross-sectional area of ​​the flow path, Equipped with, Piping system.

2. The inner diameter of the vertical pipe is 75 mm or more and 135 mm or less. The piping system according to claim 1.

3. The aforementioned vertical pipe is, First straight pipe and, A second straight pipe is positioned downstream of the first straight pipe and has a larger inner diameter than the first straight pipe, An increaser connecting the first straight pipe and the second straight pipe, Equipped with, The one or more protruding members are located inside at least one of the second straight pipe and the horizontal pipe. The piping system according to claim 1.

4. The inner diameter of the first straight pipe is 75 mm or more and 135 mm or less. The piping system according to claim 3.

5. The one or more projection members have a top portion between the first end facing the bent pipe and the second end facing away from the bent pipe that minimizes the cross-sectional area of ​​the flow path. L is the distance between the first end and the second end in the direction of the central axis of the vertical pipe or horizontal pipe on which the one or more protruding members are arranged. If L1 is the distance between the first end and the top of the vertical pipe or horizontal pipe in the direction of the central axis on which the one or more protruding members are arranged, 0.1L ≤ L1 ≤ 0.5L, The maximum flow path cross-sectional area of ​​the vertical pipe or horizontal pipe on which the one or more protruding members are arranged is A. If A1 is the cross-sectional area of ​​the one or more protruding members at the top, A1 / A ≤ 0.4 The piping system according to any one of claims 1 to 4.

6. A piping member that constitutes part of a piping system comprising a vertical pipe, a horizontal pipe located between the downstream end of the vertical pipe and a rainwater drain, and a bent pipe connecting the vertical pipe and the horizontal pipe such that the central axis of the vertical pipe and the central axis of the horizontal pipe intersect, A straight pipe that constitutes at least a part of the vertical pipe or the horizontal pipe, A protruding member is placed inside the straight pipe and partially reduces the cross-sectional area of ​​the flow path, Equipped with, Piping components.

7. Furthermore, the aforementioned bent tube is provided, The piping member according to claim 6.

8. The projection member has a top portion between a first end facing the bent pipe and a second end facing away from the bent pipe that minimizes the cross-sectional area of ​​the flow path, L is the distance between the first end and the second end of the straight pipe in the direction of the central axis. If L1 is the distance between the first end and the top of the straight pipe in the direction of the central axis, 0.1L ≤ L1 ≤ 0.5L, Let A be the maximum flow path cross-sectional area of ​​the straight pipe. If the cross-sectional area of ​​the projection member at the top is A1, A1 / A ≤ 0.4 The piping member according to claim 6.

9. The length of the straight pipe is greater than or equal to the total length of the protruding member and less than or equal to 4 m. The projection member is positioned at one end of the straight pipe, The inner diameter of the aforementioned straight pipe is between 75 mm and 135 mm. The piping member according to any one of claims 6 to 8.

10. The straight pipe has a mark indicating the center line of the protruding member at one end of the straight pipe on its outer surface, in a position not covered by the bent pipe. The piping member according to any one of claims 6 to 8.

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