drain

Abstract

A drain is provided that can improve the flow straightening effect and prevent deterioration of drainage function caused by foreign matter. [Solution] The drain 1 has an upstream end 2a and a downstream end 2b, and comprises a drain tube section 2 that forms a drop outlet 2c, and a plurality of blades 3 at the upstream end 2a of the drain tube section 2 that are arranged around the central axis C2 of the drain tube section 2, at least one of the plurality of blades 3 protruding outward from the drain tube section 2 along the central axis C2 of the drain tube section 2, and is bent around the central axis C2 so that at least a portion of the end opposite the drain tube section 2 overlaps with the drop outlet 2c when viewed from the direction of the central axis C2.

Description

[Technical Field]

[0001] The present disclosure relates to drains. [Background technology]

[0002] Patent Document 1 discloses a drainage member (siphon drain member) attached to an eaves gutter. The drainage member includes a plate-shaped cover member located at the top end, an attachment tube that fits into a lower gutter on a downspout, and multiple vertical ribs that connect the cover member and the attachment tube and are spaced apart in the circumferential direction. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6279795 Summary of the Invention [Problem to be solved by the invention]

[0004] In the drainage member disclosed in Patent Document 1, the opening on the outer periphery formed between the cover member and the vertical rib may become blocked by foreign matter such as fallen leaves carried by rainwater flowing through the eaves gutter, which may result in a decrease in drainage function (e.g., flow rate).

[0005] The present disclosure provides a drain that can improve the flow straightening effect and suppress deterioration of drainage function caused by foreign matter. [Means for solving the problem]

[0006] A drain according to one aspect of the present disclosure comprises a drain tube section having an upstream end and a downstream end and forming a drop outlet, and a plurality of blades at the upstream end of the drain tube section arranged around the central axis of the drain tube section, at least one of the plurality of blades protruding outward from the drain tube section along the central axis of the drain tube section, and bent around the central axis so that at least a portion of the end opposite the drain tube section overlaps with the drop outlet when viewed from the direction of the central axis. [Effects of the Invention]

[0007] The aspects of the present disclosure enable an improvement in the flow straightening effect and suppression of a decrease in drainage function caused by foreign matter. [Brief explanation of the drawings]

[0008] [Figure 1] Schematic diagram of the eaves gutter drainage structure including the drain according to the first embodiment [Figure 2] Cross-sectional view of the eaves gutter drainage structure including the drain according to the first embodiment [Figure 3] FIG. 1 is a perspective view of a drain according to a first embodiment; [Figure 4] FIG. 1 is a plan view of a drain according to a first embodiment; [Figure 5] 1 is a bottom view of the drain according to the first embodiment; [Figure 6] Cross-sectional view of the eaves gutter drainage structure including the drain according to the second embodiment [Figure 7] FIG. 10 is a perspective view of a drain according to a second embodiment; [Figure 8] FIG. 10 is a plan view of a drain according to a second embodiment; [Figure 9] 10 is a bottom view of the drain according to the second embodiment. [Figure 10] Cross-sectional view of the eaves gutter drainage structure including the drain according to the third embodiment [Figure 11] Schematic diagram of eaves gutter drainage structure according to variant 1 [Figure 12] Schematic diagram of eaves gutter drainage structure according to variant 2 [Figure 13] Schematic diagram of eaves gutter drainage structure according to variant 3 DETAILED DESCRIPTION OF THE INVENTION

[0009] [1. Embodiment] Hereinafter, embodiments of the present disclosure will be described, occasionally with reference to the drawings. However, the following embodiments are merely examples for explaining the present disclosure, and are not intended to limit the present disclosure to the following content (e.g., the shape, dimensions, and arrangement of each component). Positional relationships, such as up, down, left, and right, are based on the positional relationships shown in the drawings, unless otherwise specified. Each figure described in the following embodiments is a schematic diagram, and the ratios of the size and thickness of each component in each figure do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each element are not limited to the ratios shown in the drawings.

[0010] In the following description, when it is necessary to distinguish between multiple components, prefixes such as "first" and "second" are added to the names of the components. However, when the components can be distinguished from each other by the symbols attached to them, the prefixes such as "first" and "second" may be omitted in consideration of readability of the text.

[0011] In the following description, when it is necessary to distinguish between multiple components, suffixes such as "-1" and "-2" are added to the symbols of the components. However, when it is not necessary to distinguish between multiple components, the suffixes "-1" and "-2" may be omitted to improve readability.

[0012] 1.1 First Embodiment [1.1.1 Configuration] FIG. 1 is a schematic diagram of an eaves gutter drainage structure 100 including a drain 1 according to a first embodiment.

[0013] The eaves gutter drainage structure 100 is a piping system for transporting fluids with a Reynolds number of 4000 or greater. Fluids with a Reynolds number of 4000 or greater are considered to be turbulent fluids. Examples of fluids include liquids (drinking water, heat source water, wastewater, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flow (a mixture of liquid and gas). The eaves gutter drainage structure 100 constitutes a rain gutter system that collects rainwater from the roof 210 of a building 200 and drains it into a manhole 310 on the ground 300. The rainwater collected in the manhole 310 flows from the manhole 310 through an underground pipe 320 and into a storm sewer. The building 200 may be, for example, a non-residential facility such as a store, office, factory, building, school, welfare facility, or hospital, or a residential facility such as a detached house, an apartment building, or each dwelling unit of a detached house or apartment building. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping malls, stations, and airports.

[0014] The eaves gutter drainage structure 100 comprises a drain 1, an eaves gutter 10, a joint 11, a vertical pipe 12, and a socket 13.

[0015] The eaves gutter 10 collects rainwater from the roof 210 of the building 200. The eaves gutter 10 is installed under the roof 210 of the building 200. As an example, the eaves gutter 10 is arranged at the eaves edge of the roof 210. In particular, the eaves gutter 10 is arranged so as to extend along the eaves edge of the roof 210. The eaves gutter 10 is shaped like a long bucket. The eaves gutter 10 has a bottom wall 10a. An inlet 10b is formed in the bottom wall 10a. The inlet 10b is, for example, a circular opening. In a rain gutter system, the inlet 10b is also referred to as a water collection inlet, a drain outlet, or a drop outlet. As an example, the eaves gutter 10 may be formed by extrusion molding of a resin material. The eaves gutter 10 may include a core material to reinforce the overall strength of the eaves gutter 10. The core material may be made of, for example, metal. As another example, the eaves gutter 10 may be formed from a metal plate, for example, a steel plate (also called a coil).

[0016] The drain 1 is disposed at the inlet 10b of the eaves gutter 10. The drain 1 is used to reduce the generation of vortices and entrainment of air at the inlet 10b.

[0017] Fig. 2 is a cross-sectional view of the eaves gutter drainage structure 100 including the drain 1. Fig. 3 is a perspective view of the drain 1. Fig. 4 is a plan view of the drain 1. Fig. 5 is a bottom view of the drain 1. Note that in Fig. 2, the upright pipe 12 and the socket 13 are omitted from the illustration.

[0018] The drain 1 includes a drain tube portion 2 and a plurality of blades 3.

[0019] 2, the drain tube portion 2 has an upstream end 2a and a downstream end 2b, and forms a drop opening 2c. The drop opening 2c is an internal space of the drain tube portion 2.

[0020] As shown in FIGS. 2 and 3, the drain tube portion 2 includes a tube portion 21 and a flange 22.

[0021] The tubular portion 21 has a cylindrical shape and a central axis C21. The inner diameter and outer diameter of the tubular portion 21 do not change in the direction of the central axis C21. The tubular portion 21 has an inner circumferential surface 21a and an outer circumferential surface 21b. A male thread 21c is formed on the outer circumferential surface 21b of the tubular portion 21.

[0022] The inner diameter of the cylindrical portion 21 may be set appropriately according to the dimensions of the pipe connected to the drain 1. The dimensions of the pipe, 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 pipes."

[0023] Table 1 shows an example of the nominal diameter of VP rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 1, the units for the outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0024] [Table 1]

[0025] Table 2 shows an example of the nominal diameter of VU rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 2, the units of outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0026] [Table 2]

[0027] The inner diameter of the cylindrical portion 21 may be set based on an approximate inner diameter corresponding to the nominal diameter of the pipe. In this embodiment, the inner diameter of the cylindrical portion 21 may be set to correspond to any one of the nominal diameters of 75 mm, 100 mm, and 125 mm.

[0028] The flange 22 extends radially outward from the upstream end 2a of the cylindrical portion 21 (i.e., the upstream end of the cylindrical portion 21). The flange 22 is annular and has a central axis C22. The central axis C22 of the flange 22 coincides with the central axis C21 of the cylindrical portion 21.

[0029] As can be seen from FIGS. 4 and 5, the central axis C2 of the drainage tubular portion 2 coincides with the central axis C21 of the tubular portion 21 and the central axis C22 of the flange 22.

[0030] In the drainage tubular portion 2, the flange 22 defines an upstream end 2a, and the downstream end of the tubular portion 21 defines a downstream end 2b.

[0031] In this embodiment, there is a connecting portion 23 between the upstream end of the tubular portion 21 and the flange 22. The connecting portion 23 is tubular in shape with an inner diameter that gradually increases from the tubular portion 21 toward the flange 22. Therefore, in a cross section passing through the central axis C2 of the drainage tubular portion 2, the inner surface of the connecting portion 23 is a smooth arc-shaped curved surface.

[0032] 2 and 3, the blades 3 are located at the upstream end 2a of the drain tube portion 2. More specifically, the blades 3 are arranged opposite the upstream end 2a of the drain tube portion 2.

[0033] In this embodiment, the number of blades 3 is five. The five blades 3 have the same shape. As shown in FIG. 4, when viewed from the direction of the central axis C2 of the drainage tube portion 2 (i.e., the direction of the central axis C21 of the tube portion 21), the five blades 3 are arranged at equal intervals around the central axis C2 of the drainage tube portion 2. As shown in FIG. 4, there are gaps G between the multiple blades 3 in the direction around the central axis C2 of the drainage tube portion 2. In other words, the multiple blades 3 are separated from each other.

[0034] The blade 3 includes a first portion 31 and a second portion 32 .

[0035] 4 and 5, the first portion 31 overlaps with the drop opening 2c when viewed from the direction of the central axis C2. In this embodiment, the entire first portion 31 overlaps with the drop opening 2c when viewed from the direction of the central axis C2.

[0036] The first portion 31 has a first side 31a and a second side 31b. The first side 31a and the second side 31b have inner ends 31a1 and 31b1 on the central axis C2 side of the drainage tube portion 2 and outer ends 31a2 and 31b2 on the opposite side from the central axis C2 of the drainage tube portion 2. The first portion 31 has a third side 31c connecting the inner ends 31a1 and 31b1 of the first side 31a and the second side 31b to each other, and a fourth side 31d connecting the outer ends 31a2 and 31b2 of the first side 31a and the second side 31b to each other.

[0037] The positional relationship between the first side 31a and the second side 31b will be further described.

[0038] As shown in FIG. 4, when viewed from the direction of the central axis C2, the first side 31a and the second side 31b are located at different positions. When viewed from the direction of the central axis C2, the distance between the inner ends 31a1 and 31b1 of the first side 31a and the second side 31b is shorter than the distance between the outer ends 31a2 and 31b2 of the first side 31a and the second side 31b. When viewed from the direction of the central axis C2, the inner ends 31a1 and 31b1 of the first side 31a and the second side 31b are on the same circumference centered on the central axis C2. In this embodiment, the third side 31c is arc-shaped. The outer ends 31a2 and 31b2 of the first side 31a and the second side 31b are on the same circumference centered on the central axis C2. In this embodiment, the fourth side 31d is arc-shaped. When viewed from the direction of the central axis C2, the first side 31a and the second side 31b are straight lines extending along different radial directions of the drainage tube portion 2. In this embodiment, when viewed from the direction of the central axis C2, the first portion 31 can be said to be approximately fan-shaped.

[0039] As shown in FIG. 2, the first side 31a has an inner end 31a1 closer to the upstream end 2a than the outer end 31a2 in the direction of the central axis C2. The second side 31b has an inner end 31b1 closer to the upstream end 2a than the outer end 31b2 in the direction of the central axis C2. This allows the first portion 31 to have a first surface 311 facing the drain tube portion 2 and a second surface 312 facing the opposite side from the drain tube portion 2. The first surface 311 and the second surface 312 are inclined so as to approach the drain tube portion 2 as they approach the central axis C2. The first surface 311 and the second surface 312 can guide the flow along the radial direction of the drain tube portion 2 to the outlet 2c.

[0040] As shown in Figures 2 and 3, the second part 32 supports the first part 31 relative to the drain tube part 2. The second part 32 extends from the drain tube part 2 in the direction of the central axis C2. The second part 32 is plate-shaped and has a thickness in a direction perpendicular to the radial direction of the drain tube part 2. In other words, the thickness direction of the second part 32 is perpendicular to the radial direction of the drain tube part 2 when viewed from the direction of the central axis C2 of the drain tube part 2. As shown in Figure 2, the second part 32 has a first end part 32a, a second end part 32b, a third end part 32c, and a fourth end part 32d. The first end part 32a is the end part on the opposite side of the drain tube part 2 in the direction of the central axis C2, and the second end part 32b is the end part on the side of the drain tube part 2 in the direction of the central axis C2. The third end 32c is the end on the central axis C2 side in the radial direction of the drainage tube portion 2, and the fourth end 32d is the end on the opposite side of the central axis C2 in the radial direction of the drainage tube portion 2.

[0041] The second portion 32 is connected to the first portion 31, particularly to the second side 31b of the first portion 31, at a first end 32a.

[0042] The second portion 32 is connected to the drain tube portion 2 at the second end 32b. In this embodiment, the second portion 32 is connected to the flange 22 and the connecting portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. Thus, in the direction of the central axis C2 of the drain tube portion 2, the second portion 32 is connected to the flange 22 and the connecting portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. In other words, when viewed from the direction of the central axis C2 of the drain tube portion 2, the second portion 32 does not protrude into the inside of the tube portion 21. This allows the space between the drain tube portion 2 and the blades 3 to be expanded, thereby making it possible to suppress a decrease in drainage function due to foreign matter. Furthermore, because the second portion 32 extends not only to the flange 22 of the drain tube portion 2 but also to the connecting portion 23, the strength of the second portion 32 can be maintained.

[0043] As described above, in this embodiment, the blades 3 protrude outward from the drain tube portion 2 along the central axis C2 of the drain tube portion 2, and are bent around the central axis C2 so that at least a portion of the end opposite the drain tube portion 2 (the portion on the first end 32a side of the second portion 32) overlaps with the drop opening 2c when viewed from the direction of the central axis C2. Therefore, an improvement in the flow straightening effect due to the multiple blades 3 can be expected, and because the blades 3 have portions that overlap with the drop opening 2c when viewed from the direction of the central axis C2, the flow along the radial direction of the drain tube portion 2 can be guided to the drop opening 2c while preventing foreign matter from entering the drop opening 2c. This makes it possible to prevent a decrease in drainage function due to foreign matter.

[0044] Referring again to Figure 2, the joint 11 is used to connect the drain 1 to a piping member. The piping member may be, for example, a straight pipe, an elbow, or a socket. In this embodiment, the joint 11 is connected to the standpipe 12 via a socket 13.

[0045] The fitting 11 has a tubular portion 11a and a flange 11b. The tubular portion 11a is cylindrical. A female thread 11d is formed on the inner surface of the tubular portion 11a. The inner diameter of the tubular portion 11a is larger than the outer diameter of the drain tube portion 2 of the drain 1. The female thread 11d of the tubular portion 11a corresponds to the male thread 21c of the drain tube portion 2 of the drain 1. The flange 11b is located at the upstream end of the tubular portion 11a (the upstream end in Figure 2) and extends radially outward from the tubular portion 11a. In this embodiment, a connecting portion 11c is located between the upstream end of the tubular portion 11a and the flange 11b. The connecting portion 11c is cylindrical, with an inner diameter that gradually increases from the tubular portion 11a toward the flange 11b.

[0046] In the eaves gutter drainage structure 100, the drain 1 is fixed to the eaves gutter 10 using a joint 11. As shown in FIG. 2, the drain 1 is placed at the inlet 10b of the eaves gutter 10. Here, the tubular portion 21 of the drain tube portion 2 is located below the inlet 10b in the bottom wall 10a of the eaves gutter 10, and the flange 22 of the drain tube portion 2 abuts on the upper surface of the periphery of the inlet 10b in the bottom wall 10a of the eaves gutter 10. The joint 11 is attached to the tubular portion 21 of the drain tube portion 2 below the inlet 10b. Specifically, the male thread 21c of the tubular portion 21 and the female thread 11d of the tubular portion 11a are joined. The flange 11b of the joint 11 abuts on the lower surface of the periphery of the inlet 10b in the bottom wall 10a of the eaves gutter 10. In this way, the flange 22 of the drain 1 and the flange 11b of the joint 11 sandwich the bottom wall 10a of the eaves gutter 10 from both above and below, thereby fixing the drain 1 and the joint 11 to the eaves gutter 10.

[0047] When the fitting 11 is attached to the drain 1, the tubular portion 21 and the connecting portion 23 of the drain 1's tubular portion 2 are respectively located within the tubular portion 11a and the connecting portion 11c of the fitting 11. The positional relationship between the fitting 11 and the drain 1 is affected by the thickness of the bottom wall 10a of the eaves gutter 10, but the upstream end of the tubular portion 11a of the fitting 11 is located at the same position as the upstream end of the tubular portion 21 of the drain tubular portion 2 in the direction of the central axis C2 of the drain tubular portion 2, or downstream of the upstream end of the tubular portion 21 of the drain tubular portion 2.

[0048] The riser pipe 12 defines a vertical flow path. The riser pipe 12 is fixed to the wall 220 of the building 200. In a gutter system, the riser pipe 12 is also called a downspout. The riser pipe 12 is installed to drain rainwater from the inlet 10b. The riser pipe 12 allows the rainwater from the inlet 10b to flow vertically. The riser pipe 12 has a straight pipe shape. A cross section perpendicular to the central axis of the riser pipe 12 is circular. The riser pipe 12 is arranged so that the direction of the central axis of the riser pipe 12 coincides with the up-down direction (vertical direction). The riser pipe 12 has an upstream end 12a and a downstream end 12b. The upstream end 12a is the end of the riser pipe 12 that is connected to the inlet 10b (the upper end in FIG. 1 ). The downstream end 12b is the end of the standpipe 12 that is inserted into the manhole 310 (the lower end in FIG. 1). In FIG. 1, a piping cover 12c is arranged to prevent rainwater from flowing into the manhole 310 through a gap between the standpipe 12 and the manhole 310. The length of the standpipe 12 is preferably 3 m or more.

[0049] The socket 13 connects the joint 11 and the standpipe 12. In this embodiment, the tubular portion 11a of the joint 11 is connected to the upstream receiving port of the socket 13, and the upstream end portion 12a of the standpipe 12 is connected to the downstream receiving port of the socket 13.

[0050] As an example, the material of the standpipe 12 and the socket 13 is rigid polyvinyl chloride. The dimensions of the standpipe 12, such as 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." The dimensions of the socket 13, such as the outer diameter and thickness, may be set in accordance with the standard for sockets in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage."

[0051] [1.1.2 Effects, etc.] The drain 1 described above comprises a drain tube section 2 having an upstream end 2a and a downstream end 2b and forming a drop port 2c, and a plurality of blades 3 arranged around the central axis C2 of the drain tube section 2 at the upstream end 2a of the drain tube section 2, at least one of the plurality of blades 3 protruding outward from the drain tube section 2 along the central axis C2 of the drain tube section 2, and at least a portion of the end opposite the drain tube section 2 (the portion on the first end 32a side of the second section 32) is bent around the central axis C2 so that it overlaps with the drop port 2c when viewed from the direction of the central axis C2. This configuration improves the flow straightening effect and makes it possible to suppress a deterioration in drainage function caused by foreign matter.

[0052] In the drain 1, at least one of the blades 3 has a first side 31a and a second side 31b, each of which has an inner end 31a1, 31b1 on the central axis side and an outer end 31a2, 31b2 on the opposite side of the central axis C2, and the first side 31a and the second side 31b are located at different positions from the first side 31a and the second side 31b when viewed from the direction of the central axis C2, and the distance between the inner ends 31a1, 31b1 of the first side 31a and the second side 31b when viewed from the direction of the central axis C2 is shorter than the distance between the outer ends 31a2, 31b2 of the first side 31a and the second side 31b. This configuration improves the flow straightening effect and prevents a decrease in drainage function due to foreign matter.

[0053] In the drain 1, when viewed from the direction of the central axis C2, the inner ends 31a1 and 31b1 of the first side 31a and the second side 31b are on the same circumference centered on the central axis C2. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0054] In the drain 1, the outer ends 31a2, 31b2 of the first side 31a and the second side 31b are on the same circumference centered on the central axis C2 when viewed from the direction of the central axis C2. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0055] In each of the first side 31a and the second side 31b of the drain 1, the inner ends 31a1 and 31b1 are closer to the upstream end 2a than the outer ends 31a2 and 31b2 in the direction of the central axis C2. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0056] In the drain 1, when viewed from the direction of the central axis C2, the first side 31a and the second side 31b are linear along different radial directions of the drain tube portion 2. This configuration improves the flow straightening effect and makes it possible to suppress a decrease in drainage function caused by foreign matter.

[0057] In the drain 1, at least one of the plurality of blades 3 includes a first portion 31 having a first side 31a and a second side 31b, and a second portion 32 extending from the drain tube portion 2 in the direction of the central axis C2 and supporting the first portion 31. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0058] In the drain 1, the second portion 32 is in the form of a plate having a thickness in a direction perpendicular to the radial direction of the drain tubular portion 2. This configuration enables a further improvement in the rectifying effect.

[0059] In the drain 1, the entire first portion 31 overlaps with the drop opening 2c when viewed from the direction of the central axis C2. This configuration makes it possible to suppress a decrease in drainage function caused by foreign matter.

[0060] In the drain 1, each of the plurality of blades 3 includes a first side 31a and a second side 31b, and the plurality of blades 3 are positioned at equal intervals around the central axis C2 with a gap G. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0061] 1.2 Second Embodiment [1.2.1 Configuration] Fig. 6 is a cross-sectional view of an eaves gutter drainage structure 100A including a drain 1A according to embodiment 2. The eaves gutter drainage structure 100A includes the drain 1A, an eaves gutter 10, a joint 11, a standpipe 12, and a socket 13. Note that the standpipe 12 and the socket 13 are not shown in Fig. 6.

[0062] The drain 1A includes a drain tube portion 2, a plurality of blades 3A, and a connecting member 4.

[0063] 6 and 7, the plurality of blades 3A are located at the upstream end 2a of the drain tube portion 2. More specifically, the plurality of blades 3A are arranged opposite the upstream end 2a of the drain tube portion 2.

[0064] In this embodiment, the number of blades 3A is five. The five blades 3 have the same shape. As shown in FIG. 8, when viewed from the direction of the central axis C2 of the drainage tube portion 2 (i.e., the direction of the central axis C21 of the tube portion 21), the five blades 3A are arranged at equal intervals around the central axis C2 of the drainage tube portion 2. As shown in FIG. 8, there are gaps G between the multiple blades 3A in the direction around the central axis C2 of the drainage tube portion 2. In other words, the multiple blades 3 are separated from each other in the direction around the central axis C2 of the drainage tube portion 2.

[0065] As shown in Figures 8 and 9, blade 3A extends in the direction of central axis C2 from drain tube portion 2. Blade 3A is plate-shaped with a thickness in a direction intersecting the radial direction of drain tube portion 2. Blade 3A is bent overall so as to partially overlap drop opening 2c when viewed from the direction of central axis C2.

[0066] As shown in Figure 7, the blade 3A has a first side 3a, a second side 3b, a third side 3c, and a fourth side 3d. The first side 3a defines the end opposite the drain tube portion 2 in the direction of the central axis C2, and the second side 3b defines the end on the drain tube portion 2 side in the direction of the central axis C2. The third side 3c defines the end on the central axis C2 side in the radial direction of the drain tube portion 2, and the fourth side 3d defines the end on the opposite side of the central axis C2 in the radial direction of the drain tube portion 2.

[0067] The first side 3a and the second side 3b have inner ends 3a1, 3b1 on the central axis C2 side of the drainage tube portion 2 and outer ends 3a2, 3b2 on the opposite side from the central axis C2 of the drainage tube portion 2. The third side 3c connects the inner ends 3a1, 3b1 of the first side 3a and the second side 3b to each other, and the fourth side 3d connects the outer ends 3a2, 3b2 of the first side 3a and the second side 3b to each other.

[0068] The positional relationship between the first side 3a and the second side 3b will be further explained.

[0069] As shown in FIG. 8, when viewed from the direction of the central axis C2, the first side 3a and the second side 3b are located at different positions. When viewed from the direction of the central axis C2, the distance between the inner ends 3a1, 3b1 of the first side 3a and the second side 3b is shorter than the distance between the outer ends 3a2, 3b2 of the first side 3a and the second side 3b. In particular, in this embodiment, when viewed from the direction of the central axis C2, the second side 3b is linear along the radial direction of the drain tube portion 2, and the first side 3a curves so that it moves away from the second side 3b the further it is from the central axis C2. Furthermore, when viewed from the direction of the central axis C2, the inner ends 3a1, 3b1 of the first side 3a and the second side 3b are located at the same position. When viewed from the direction of the central axis C2, the outer ends 3a2, 3b2 of the first side 3a and the second side 3b are not on the same circumference centered on the central axis C2.

[0070] As shown in Figure 6, the second side 3b is closer to the upstream end 2a than the first side 3a in the direction of the central axis C2. Here, in the first side 3a, the inner end 3a1 and the outer end 3a2 are at the same position in the direction of the central axis C2. In the second side 3b, the inner end 3b1 and the outer end 3b2 are at the same position in the direction of the central axis C2.

[0071] The blade 3 has a first surface 301 facing the drain tube portion 2 and a second surface 302 facing the opposite side from the drain tube portion 2. The first surface 301 is inclined such that the angle of inclination relative to the direction around the central axis C2 changes from an acute angle to a right angle as it approaches the central axis C2. The second surface 302 is inclined such that the angle of inclination relative to the direction around the central axis C2 changes from an obtuse angle to a right angle as it approaches the central axis C2. The first surface 301 and the second surface 302 can guide the flow along the radial direction of the drain tube portion 2 to the outlet 2c.

[0072] The blade 3A is connected to the drain tube portion 2 at the second side 3b. In this embodiment, the second side 3b is connected to the flange 22 and the connecting portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. In this way, in the direction of the central axis C2 of the drain tube portion 2, the second side 3b is connected to the flange 22 and the connecting portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. This allows the space between the drain tube portion 2 and the blade 3 to be expanded, thereby making it possible to suppress a decrease in drainage function due to foreign matter. Furthermore, since the second side 3b extends not only to the flange 22 of the drain tube portion 2 but also to the connecting portion 23, the strength of the blade 3A can be maintained.

[0073] As described above, in this embodiment, the blades 3A protrude outward from the drain tube portion 2 along the central axis C2 of the drain tube portion 2, and are bent around the central axis C2 so that at least a portion of the end opposite the drain tube portion 2 (the portion on the first side 3a side) overlaps with the drop opening 2c when viewed from the direction of the central axis C2. Therefore, an improvement in the flow straightening effect due to the multiple blades 3A can be expected, and because the blades 3A have portions that overlap with the drop opening 2c when viewed from the direction of the central axis C2, the flow along the radial direction of the drain tube portion 2 can be guided to the drop opening 2c while preventing foreign matter from entering the drop opening 2c. This makes it possible to prevent a decrease in drainage function due to foreign matter.

[0074] The connecting member 4 connects the plurality of blades 3A together. As shown in Figures 6 and 7, the connecting member 4 is located at the upstream end 2a of the drain tube portion 2 so as to overlap with the drop outlet 2c when viewed from the direction of the central axis C2. More specifically, as shown in Figure 6, the connecting member 4 is positioned opposite the upstream end 2a of the drain tube portion 2 so that the central axis C4 of the connecting member 4 coincides with the central axis C2 of the drain tube portion 2.

[0075] The connecting member 4 has a first opening 4a and a second opening 4b. The connecting member 4 is cylindrical with unchanged inner and outer diameters. In this embodiment, the connecting member 4 is not inserted into the drain tube portion 2. In particular, in this embodiment, the end of the connecting member 4 on the second opening 4b side and the upstream end 2a of the drain tube portion 2 are on the same plane. In other words, the minimum distance between the connecting member 4 and the drain tube portion 2 is 0.

[0076] In this embodiment, as shown in Figure 7, the plurality of blades 3A are connected to the connecting member 4 in the radial direction of the drain tube portion 2. More specifically, the third sides 3c of the plurality of blades 3 are connected to the outer peripheral surface 41 of the connecting member 4. This allows the plurality of blades 3 to be connected to each other via the connecting member 4. This allows for improved strength.

[0077] [1.2.2 Effects, etc.] The drain 1A described above comprises a drain tube section 2 having an upstream end 2a and a downstream end 2b and forming a drop port 2c, and a plurality of blades 3A arranged around the central axis C2 of the drain tube section 2 at the upstream end 2a of the drain tube section 2, at least one of the plurality of blades 3A protruding outward from the drain tube section 2 along the central axis C2 of the drain tube section 2, and bending around the central axis C2 so that at least a portion of the end opposite the drain tube section 2 (the portion on the first side 3a side) overlaps with the drop port 2c when viewed from the direction of the central axis C2. This configuration improves the flow straightening effect and makes it possible to suppress a deterioration in drainage function caused by foreign matter.

[0078] The drain 1A further includes a connecting member 4 that is located at a position overlapping with the drop port 2c when viewed from the direction of the central axis C2 and that is connected to the plurality of blades 3A in the radial direction of the drain tube portion 2. This configuration enables improvement of strength.

[0079] In the drain 1A, at least one of the blades 3A has a first side 3a and a second side 3b, each of which has an inner end 3a1, 3b1 on the central axis side and an outer end 3a2, 3b2 on the opposite side from the central axis C2, and the first side 3a and the second side 3b are located at different positions from the first side 3a and the second side 3b when viewed from the direction of the central axis C2, and the distance between the inner ends 3a1, 3b1 of the first side 3a and the second side 3b when viewed from the direction of the central axis C2 is shorter than the distance between the outer ends 3a2, 3b2 of the first side 3a and the second side 3b. This configuration improves the flow straightening effect and prevents a decrease in drainage function due to foreign matter.

[0080] In the drain 1A, the second side 3b is closer to the upstream end 2a than the first side 3a in the direction of the central axis C2. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0081] In the drain 1A, at least one of the plurality of blades 3A is connected at the second side 3b to the drain tube portion 2. This configuration makes it possible to improve the flow straightening effect and prevent a decrease in drainage function due to foreign matter.

[0082] In the drain 1A, when viewed from the direction of the central axis C2, the second side 3b is linear along the radial direction of the drain tube portion 2, and the first side 3a curves so that the further it is from the central axis C2, the further it is from the second side 3b. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0083] In the drain 1A, the inner ends 3a1, 3b1 of the first side 3a and the second side 3b are located at the same position when viewed from the direction of the central axis C2. This configuration improves the flow straightening effect and prevents the drainage function from deteriorating due to foreign matter.

[0084] In the drain 1A, when viewed from the direction of the central axis C2, the outer ends 3a2, 3b2 of the first side 3a and the second side 3b are not on the same circumference about the central axis C2. This configuration improves the flow straightening effect and prevents deterioration of the drainage function due to foreign matter.

[0085] In the drain 1A, the inner ends 3a1, 3b1 and the outer ends 3a2, 3b2 of the first side 3a and the second side 3b are located at the same position along the central axis C2. This configuration improves the flow straightening effect and prevents the drainage function from being impaired by foreign matter.

[0086] In the drain 1A, each of the plurality of blades 3A includes a first side 3a and a second side 3b, and the plurality of blades 3A are positioned at equal intervals around the central axis C2 with a gap G. This configuration improves the flow straightening effect and makes it possible to prevent a decrease in drainage function due to foreign matter.

[0087] 1.3 Third Embodiment 1.3.1 Configuration Fig. 10 is a cross-sectional view of an eaves gutter drainage structure 100B including a drain 1B according to embodiment 3. The eaves gutter drainage structure 100B includes the drain 1B, an eaves gutter 10, a joint 11, a standpipe 12, and a socket 13. Note that the standpipe 12 and the socket 13 are not shown in Fig. 10.

[0088] The drain 1B includes a drain tube portion 2, a plurality of blades 3, and a connecting member 4B.

[0089] The connecting member 4B connects the multiple blades 3 together. The connecting member 4B is located at the upstream end 2a of the drain tube portion 2 so as to overlap with the drop outlet 2c when viewed from the direction of the central axis C2. More specifically, the connecting member 4B is positioned opposite the upstream end 2a of the drain tube portion 2 so that the central axis C4 of the connecting member 4B coincides with the central axis C2 of the drain tube portion 2.

[0090] The connecting member 4B has a first opening 4a and a second opening 4b. The connecting member 4 is cylindrical with unchanged inner and outer diameters. In this embodiment, the connecting member 4B is not inserted into the drain tube portion 2. In particular, in this embodiment, the end of the connecting member 4 on the second opening 4b side and the upstream end 2a of the drain tube portion 2 are on the same plane. In other words, the minimum distance between the connecting member 4B and the drain tube portion 2 is 0.

[0091] In this embodiment, the blades 3 are connected to the connecting member 4B in the radial direction of the drain tube portion 2. In this embodiment, the connecting member 4B does not overlap with the first portions 31 of the blades 3 in the direction of the central axis C2. Therefore, the third ends 32c of the second portions 32 of the blades 3 are connected to the outer circumferential surface 41 of the connecting member 4B. In other words, the connecting member 4B is connected to the second portions 32 without contacting the first portions 31. This allows the second portions 32 of the blades 3 to be connected to each other via the connecting member 4B. This allows for improved strength. This reduces the possibility that the connecting member 4B will interfere with the flow guidance by the first portions 31.

[0092] [1.3.2 Effects, etc.] The drain 1B described above is located at a position overlapping with the outlet 2c when viewed from the direction of the central axis C2, and further includes a connecting member 4B connected to the plurality of blades 3 in the radial direction of the drain tube portion 2, and the connecting member 4B is connected to the second portion 32 so as not to come into contact with the first portion 31. This configuration enables improvement of strength.

[0093] [2. Modifications] The embodiments of the present disclosure are not limited to the above-described embodiments 1 to 3. The above-described embodiments 1 to 3 can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiments 1 to 3 are listed below. The modifications described below can be applied in appropriate combinations.

[0094] In the following, reference will be made to the symbols used in embodiment 1, even though they may be applicable to any of the above embodiments 1 to 3. However, this is merely to simplify the description and is not intended to exclude application to embodiments 2 and 3.

[0095] The eaves gutter drainage structure to which the drain 1 described above can be applied is not limited to the eaves gutter drainage structure 100 shown in FIG.

[0096] [2.1 Variation 1] 11 is a schematic diagram of an eaves gutter drainage structure 100C according to Modification 1. The eaves gutter drainage structure 100C includes a drain 1, an eaves gutter 10, a joint 11, a vertical pipe 12, a horizontal pipe 14, a first elbow 15-1, and a second elbow 15-2.

[0097] In the eaves gutter drainage structure 100C, the vertical pipe 12 is connected to the joint 11 via the horizontal pipe 14, the first elbow 15-1, and the second elbow 15-2.

[0098] The horizontal pipe 14 defines a flow path that intersects the vertical direction. In a gutter system, the horizontal pipe 14 is also called a call gutter. The horizontal pipe 14 is a portion that allows rainwater from the building 200 to flow from the inlet 10b to the standpipe 12. The horizontal pipe 14 is located between the inlet 10b for rainwater from the building 200 and the standpipe 12. The horizontal pipe 14 is a straight pipe. The cross section perpendicular to the central axis of the horizontal pipe 14 is circular. The horizontal pipe 14 is fixed so that the central axis of the horizontal pipe 14 is inclined relative to the up-down direction (vertical direction). The horizontal pipe 14 has an upstream end 14a and a downstream end 14b. The upstream end 14a is the end of the horizontal pipe 14 that is connected to the inlet 10b (the left end in Figure 11). The downstream end 14b is the end of the horizontal pipe 14 that is connected to the standpipe 12 (the right end in Figure 11). As an example, the material of the horizontal pipe 14 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 14, such as the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipes."

[0099] The first elbow 15-1 and the second elbow 15-2 change the direction of the flow path. The first elbow 15-1 and the second elbow 15-2 are joints that connect flow paths that run in different directions, such as a vertical pipe and a horizontal pipe.

[0100] Each of the first elbow 15-1 and the second elbow 15-2 has a curved pipe portion (bent portion) 15a and sockets 15b, 15c. The curved pipe portion 15a and the sockets 15b, 15c are formed as a continuous, integrated unit. As an example, the material of the first elbow 15-1 and the second elbow 15-2 is rigid polyvinyl chloride. The dimensions of the first elbow 15-1 and the second elbow 15-2 may be set in accordance with the standard JIS K 6739, "Rigid polyvinyl chloride pipe fittings for drainage."

[0101] Each of the first elbow 15-1 and the second elbow 15-2 is a 45° elbow (so-called 45L) defined in JIS K 6739. In each of the first elbow 15-1 and the second elbow 15-2, the angle between the central axes of the sockets 15b, 15c is 45°.

[0102] In the eaves gutter drainage structure 100C, the tubular portion 11a of the joint 11 is connected to the socket 15b of the first elbow 15-1, and the upstream end 14a of the horizontal pipe 14 is connected to the socket 15c of the first elbow 15-1. The downstream end 14b of the horizontal pipe 14 is connected to the socket 15b of the second elbow 15-2, and the upstream end 12a of the stand pipe 12 is connected to the socket 15c of the second elbow 15-2. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole section 310 is formed.

[0103] [2.2 Variation 2] 12 is a schematic diagram of an eaves gutter drainage structure 100D according to Modification 2. The eaves gutter drainage structure 100D includes a drain 1, an eaves gutter 10, a joint 11, a standpipe 12, and an eccentric socket 16.

[0104] In the eaves gutter drainage structure 100D, the upright pipe 12 is connected to the joint 11 via an eccentric socket 16.

[0105] The eccentric socket 16 has an eccentric portion 16a and sockets 16b and 16c. The eccentric portion 16a and the sockets 16b and 16c are formed as a continuous, integrated unit. As an example, the material of the eccentric socket 16 is hard polyvinyl chloride. The eccentric socket 16 may be a so-called S socket.

[0106] In the eaves gutter drainage structure 100D, the tubular portion 11a of the joint 11 is connected to the socket 16b of the eccentric socket 16, and the upstream end portion 12a of the standpipe 12 is connected to the socket 16b of the eccentric socket 16. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole portion 310 is formed.

[0107] [2.3 Variation 3] 13 is a schematic diagram of an eaves gutter drainage structure 100E according to Modification 3. The eaves gutter drainage structure 100E includes a drain 1, eaves gutters 10-1 and 10-2, a joint 11, vertical pipes 12-1 and 12-2, horizontal pipes 14-1 and 14-2, first to third elbows 15-1 to 15-3, a tee 17, a drain 18, and a piping member 19.

[0108] The eaves gutter 10-1 receives rainwater from the roof 210 of the building 200. The eaves gutter 10-1 is installed below the roof 210 of the building 200. The eaves gutter 10-2 receives rainwater from a roof or eaves below the roof 210 of the building 200. For example, the eaves gutter 10-2 is installed below the eaves gutter 10-1.

[0109] The drain 1 is disposed at the inlet 10b of the eaves gutter 10-1.

[0110] The drain 18 is disposed at the inlet 10b of the eaves gutter 10-2. The drain 18 does not necessarily have to have the same configuration as the drain 1. The drain 18 may have a known configuration.

[0111] The vertical pipe 12-1 is connected to the eaves gutter 10-1 (drain 1 installed in the eaves gutter 10-1) via a horizontal pipe 14-1, a first elbow 15-1, a second elbow 15-2, and a piping member 19. The vertical pipe 12-2 is connected to the eaves gutter 10-2 (drain 18 installed in the eaves gutter 10-2) via a horizontal pipe 14-2, a third elbow 15-3, and a tee 17.

[0112] The horizontal pipe 14-1 is located between the eaves gutter 10-1 and the vertical pipe 12-1. The horizontal pipe 14-2 is located between the eaves gutter 10-2 and the vertical pipe 12-2. The length of the horizontal pipe 14-1 is 2 m or less, preferably 1 m or less.

[0113] The first elbow 15-1 connects the eaves gutter 10-1 to the upstream end 14a of the horizontal pipe 14-1. The second elbow 15-2 connects the downstream end 14b of the horizontal pipe 14-1 to the upstream end 12a of the standpipe 12-1. The third elbow 15-3 connects the eaves gutter 10-2 to the upstream end 14a of the horizontal pipe 14-2.

[0114] In this modification, the first elbow 15-1 is a 90° large bend elbow (so-called LL) defined in JIS K 6739. The second elbow 15-2 and the third elbow 15-3 are 90° elbows (so-called DL) defined in JIS K 6739.

[0115] Tee 17 has a first receiving port 17a facing upward, a second receiving port 17b facing downward, and a third receiving port 17c facing sideways. Tee 17 merges the fluid flowing in from first receiving port 17a with the fluid flowing in from third receiving port 17c, and discharges the combined fluid from second receiving port 17b. The angle between the central axis of first receiving port 17a and the central axis of third receiving port 17c is 90° or less. As an example, the angle between the central axis of first receiving port 17a and the central axis of third receiving port 17c is set to 88.83°. As an example, Tee 17 is made of rigid polyvinyl chloride.

[0116] The first socket 17a is connected to the downstream end 12b of the standpipe 12-1, the second socket 17b is connected to the upstream end 12a of the standpipe 12-2, and the third socket 17c is connected to the downstream end 14b of the horizontal pipe 14-2.

[0117] The eaves gutter drainage structure 100E includes a first elbow 15-1 and a second elbow 15-2 between the eaves gutter 10-1 and the upright pipe 12-1. The flow path direction changes in each of the first elbow 15-1 and the second elbow 15-2. When the flow path direction changes, pressure loss due to separation can be a factor in a decrease in flow rate. In this modification, the radius of curvature of the second elbow 15-2 is smaller than the radius of curvature of the first elbow 15-1. Therefore, the pressure loss caused by the second elbow 15-2 tends to be greater than the pressure loss caused by the first elbow 15-1. A piping member 19 is provided to reduce the decrease in flow rate due to the pressure loss caused by the second elbow 15-2.

[0118] The piping member 19 is disposed between the second elbow 15-2 and the standpipe 12-1. The piping member 19 includes a straight pipe portion 19a and a protruding member 19b.

[0119] The straight pipe section 19a has a straight pipe shape and includes a socket 191 at its downstream end. The socket 191 is provided to connect the upstream end 12a of the standpipe 12-1 to the straight pipe section 19a. The upstream end of the straight pipe section 19a is connected to the socket 15c of the second elbow 15-2.

[0120] The protruding member 19b is located downstream of the second elbow 15-2. More specifically, the protruding member 19b is located on the inner circumferential side of the second elbow 15-2 within the straight pipe section 19a on the downstream side of the second elbow 15-2, and is used to partially reduce the cross-sectional area of ​​the flow path.

[0121] The surface of the protruding member 19b has a curved shape that protrudes from the inner periphery of the second elbow 15-2 to the outer periphery. The height of the protruding member 19b varies along the direction of the central axis of the standpipe 12-1. The protruding member 19b has a top portion where it is highest, located between the upstream end and the downstream end. The height of the protruding member 19b increases monotonically from the upstream end to the top portion. The height of the protruding member 19b decreases monotonically from the top portion to the downstream end. The protruding member 19b minimizes the flow path cross-sectional area of ​​the standpipe 12-1 at the top portion.

[0122] In this way, by providing the protruding member 19b, a reduced portion exists downstream of the second elbow 15-2 where the flow path cross-sectional area is smaller than the flow path cross-sectional area of ​​the standpipe 12-1. The presence of such protruding member 19b is expected to (1) make it easier for the fluid to flow along the pipe wall than in the absence of the protruding member 19b, and (2) reduce the number of portions where pressure loss may occur. Therefore, the protruding member 19b can reduce the occurrence of pressure loss due to separation downstream of the second elbow 15-2, thereby improving the flow rate.

[0123] In the eaves gutter drainage structure 100E, rainwater from the eaves gutter 10-1 flows through the first elbow 15-1, horizontal pipe 14-1, second elbow 15-2, piping member 19, and vertical pipe 12-1 into the tee 17. Rainwater from the eaves gutter 10-2 flows through the third elbow 15-3 and horizontal pipe 14-2 into the tee 17. The rainwater from the eaves gutter 10-1 and the rainwater from the eaves gutter 10-2 then join at the tee 17, pass through the vertical pipe 12-2, and are discharged into the manhole 310.

[0124] [2.4 Other Modifications] In one variation, the drain tube portion 2 and the plurality of blades 3 may be formed by injection molding of resin such as hard polyvinyl chloride resin, polycarbonate, ABS, etc., or may be made of metal such as cast iron. The drain tube portion 2 and the plurality of blades 3 may be formed as a single, continuous part, or may be formed separately.

[0125] In one modified example, the number of blades 3 is not particularly limited. The blades 3 do not have to have the same shape. The blades 3 do not have to be arranged at equal intervals around the central axis C2 of the drainage tube portion 2 when viewed from the direction of the central axis C2 of the drainage tube portion 2 (i.e., the direction of the central axis C21 of the tube portion 21).

[0126] In one modified example, the positional relationship between the first side 3a and the second side 3b of the blade 3 is not limited to the above example. The positional relationship between the first side 3a and the second side 3b may be set so as to guide the flow along the radial direction of the drain tube portion 2 to the outlet 2c.

[0127] In one modification, the blades 3 may be connected to the tubular portion 21 without being connected to the flange 22 and the connecting portion 23 of the tubular drain portion 2.

[0128] In one modified example, the drain tube part 2 does not necessarily have to have the connection part 23.

[0129] In one variant, when viewed from the direction of the central axis C2 of the drainage tube portion 2, the outer shape of the drainage tube portion 2, for example, the outer shapes of the tube portion 21 and the flange 22, is not limited to a circular shape, but may be an elliptical shape, a polygonal shape, or other shape.

[0130] In one modified example, part or all of the connecting member 4 may be cylindrical, with the outer and inner diameters decreasing toward the drain tube portion 2. The connecting member 4 may be a solid member rather than a hollow member having a first opening 4a and a second opening 4b. When viewed from the direction of the central axis C4 of the connecting member 4, the outer shape of the connecting member 4 is not limited to a circular shape, and may be an elliptical shape, a polygonal shape, or another shape.

[0131] [3. Aspects] As is apparent from the above-described embodiment and modifications, the present disclosure includes the following aspects.

[0132] [Aspect 1] a drain tube portion having an upstream end and a downstream end and forming a drop outlet; A plurality of blades arranged around a central axis of the drain tube portion at the upstream end of the drain tube portion; Equipped with At least one of the plurality of blades protruding outward from the drain tube portion along the central axis of the drain tube portion, The drain pipe is bent around the central axis so that at least a part of the end opposite to the drain pipe overlaps with the drop outlet when viewed from the direction of the central axis. Drain.

[0133] [Aspect 2] The drain pipe further includes a connecting member that is located at a position overlapping with the outlet when viewed from the direction of the central axis and is connected to the plurality of blades in the radial direction of the drain pipe portion. Drain of embodiment 1.

[0134] [Aspect 3] At least one of the plurality of blades has a first side and a second side; each of the first side and the second side has an inner end on the central axis side and an outer end on the opposite side to the central axis, When viewed from the direction of the central axis, the first side and the second side are at different positions, When viewed from the direction of the central axis, the distance between the inner ends of the first side and the second side is shorter than the distance between the outer ends of the first side and the second side. The drain of embodiment 1 or 2.

[0135] [Aspect 4] When viewed from the direction of the central axis, the inner ends of the first side and the second side are on the same circumference centered on the central axis. Drain of embodiment 3.

[0136] [Aspect 5] When viewed from the direction of the central axis, the outer ends of the first side and the second side are on the same circumference centered on the central axis. The drain of embodiment 3 or 4.

[0137] [Aspect 6] In each of the first side and the second side, the inner end is closer to the upstream end than the outer end in the direction of the central axis. The drain according to any one of aspects 3 to 5.

[0138] [Aspect 7] When viewed from the direction of the central axis, the first side and the second side are straight lines along different radial directions of the drain tube portion. The drain according to any one of aspects 3 to 6.

[0139] [Aspect 8] The at least one of the plurality of blades is a first portion having the first side and the second side; a second portion extending from the drain tube portion in the direction of the central axis and supporting the first portion; Including, The drain according to any one of aspects 3 to 7.

[0140] [Aspect 9] The second portion is a plate-like member having a thickness in a direction perpendicular to the radial direction of the drain tube portion. Drain of aspect 8.

[0141] [Aspect 10] Further, a connecting member is provided at a position overlapping with the drop outlet when viewed from the direction of the central axis, and is connected to the plurality of blades in the radial direction of the drain tube portion, The connecting member is connected to the second portion so as not to contact the first portion. The drain of embodiment 8 or 9.

[0142] [Aspect 11] When viewed from the direction of the central axis, the entire first portion overlaps with the drop opening. The drain of any one of aspects 8 to 10.

[0143] [Aspect 12] In the direction of the central axis, the second side is closer to the upstream end than the first side. The drain according to any one of aspects 3 to 7.

[0144] [Aspect 13] At least one of the plurality of blades is connected to the drain tube portion at the second side. Drain of aspect 12.

[0145] [Aspect 14] When viewed from the direction of the central axis, the second side is a straight line along the radial direction of the drain tube portion, and the first side is curved so as to move away from the second side as it moves away from the central axis. The drain of embodiment 12 or 13.

[0146] [Aspect 15] each of the plurality of blades includes the first and second sides; The plurality of blades are positioned at equal intervals around the central axis with gaps between them. The drain according to any one of embodiments 1 to 14.

[0147] Aspects 2 to 15 are optional elements and are not essential. [Industrial Applicability]

[0148] The present disclosure is applicable to drains, particularly to drains used in eaves gutters. [Explanation of symbols]

[0149] 1, 1A, 1B drain 2 Drain pipe section 2a Upstream end 2b Downstream end 2c Drop opening 3, 3A feather 3a First side 3a1 Inner edge 3a2 outer edge 3b 2nd side 3b1 Inner edge 3b2 Outer edge 31 Part 1 31a Side 1 31a1 Inside edge 31a2 outer end 31b No. 2 31b1 Inner end 31b2 Outer end 32 Part 2 4.4B Connecting Components

Claims

1. a drain tube portion having an upstream end and a downstream end and forming a drop outlet; A plurality of blades arranged around a central axis of the drain tube portion at the upstream end of the drain tube portion; Equipped with At least one of the plurality of blades protruding outward from the drain tube portion along the central axis of the drain tube portion, The drain pipe is bent around the central axis so that at least a part of the end opposite to the drain pipe overlaps with the drop outlet when viewed from the direction of the central axis. Drain.

2. The drain pipe further includes a connecting member that is located at a position overlapping with the outlet when viewed from the direction of the central axis and is connected to the plurality of blades in the radial direction of the drain pipe portion. The drain of claim 1.

3. At least one of the plurality of blades has a first side and a second side; each of the first side and the second side has an inner end on the central axis side and an outer end on the opposite side to the central axis; When viewed from the direction of the central axis, the first side and the second side are at different positions, When viewed from the direction of the central axis, the distance between the inner ends of the first side and the second side is shorter than the distance between the outer ends of the first side and the second side. The drain of claim 1.

4. When viewed from the direction of the central axis, the inner ends of the first side and the second side are on the same circumference centered on the central axis. The drain of claim 3.

5. When viewed from the direction of the central axis, the outer ends of the first side and the second side are on the same circumference centered on the central axis. The drain of claim 3.

6. In each of the first side and the second side, the inner end is closer to the upstream end than the outer end in the direction of the central axis. The drain of claim 3.

7. When viewed from the direction of the central axis, the first side and the second side are straight lines extending along different radial directions of the drain tube portion. The drain of claim 3.

8. The at least one of the plurality of blades is a first portion having the first side and the second side; a second portion extending from the drain tube portion in the direction of the central axis and supporting the first portion; Including, The drain of claim 3.

9. The second portion is a plate-like member having a thickness in a direction perpendicular to the radial direction of the drain tube portion. The drain of claim 8.

10. Further, a connecting member is provided at a position overlapping with the drop outlet when viewed from the direction of the central axis, and is connected to the plurality of blades in the radial direction of the drain tube portion, The connecting member is connected to the second portion so as not to contact the first portion. The drain of claim 8.

11. When viewed from the direction of the central axis, the entire first portion overlaps with the drop opening. The drain of claim 8.

12. In the direction of the central axis, the second side is closer to the upstream end than the first side. The drain of claim 3.

13. At least one of the plurality of blades is connected to the drain tube portion at the second side. The drain of claim 12.

14. When viewed from the direction of the central axis, the second side is a straight line along the radial direction of the drain tube portion, and the first side is curved so as to move away from the second side as it moves away from the central axis. The drain of claim 12.

15. each of the plurality of blades includes the first side and the second side; The plurality of blades are positioned at equal intervals around the central axis with gaps between them. The drain of claim 1.

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