Connecting member

Abstract

To provide a connecting member that enables improved drainage capacity. [Solution] The connecting member is used to connect a piping member to the inlet of a gutter and comprises a first member having a cylindrical portion positioned at the inlet and a flange extending outward from the upstream end of the cylindrical portion, and a second member having a housing portion that houses the cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the flange, and a connecting cylindrical portion that protrudes from the bottom wall of the housing portion and is connected to the receiving end of the piping member, wherein at least a part of the housing portion has a flow path cross-sectional area 1.1 times or more the flow path cross-sectional area of ​​the connecting cylindrical portion, has a length of 10 mm or more in the direction of the central axis of the connecting cylindrical portion, and in a cross section passing through the central axis of the connecting cylindrical portion, at least a part between the bottom surface of the housing portion opposite to the connecting cylindrical portion on the bottom wall and the inner circumferential surface of the connecting cylindrical portion has a chamfered portion with a chamfer dimension of 3 mm or more in the cross section passing through the central axis of the connecting cylindrical portion.

Description

Technical Field

[0001] The present disclosure relates to a connecting member.

Background Art

[0002] Patent Document 1 discloses a rain gutter system (eave gutter drainage structure). The rain gutter system disclosed in Patent Document 1 includes a water storage portion as a connecting member for piping members (a first connecting joint, a leader pipe, a second connecting joint (connecting joint), and a downpipe) connected to the opening (inflow port) of the eave gutter. The water storage portion includes a container body, a lid portion, and a fixture. The container body includes a housing and a cylindrical body. The housing is formed in a box shape with an open top. The cylindrical body is formed in a cylindrical shape, and the upper end of the cylindrical body is joined to the lower surface of the housing.

Prior Art Literature

Patent Literature

[0003]

Patent Document 1

Summary of the Invention

Problem to be Solved by the Invention

[0004] In Patent Document 1, the water storage portion is used to generate a siphon phenomenon. Patent Document 1 describes that "when rainwater accumulates in the water storage portion, the leader pipe, the second connecting joint, and the downpipe arranged downstream of the water storage portion become full of water. Then, the rainwater in the water storage portion is pulled by the rainwater in the leader pipe, the second connecting joint, and the downpipe, thereby generating a siphon phenomenon, and the rainwater in the rain gutter system flows vigorously downstream."

[0005] In Patent Document 1, rainwater accumulated in the housing of the water storage portion flows to the piping member through the cylindrical body having a smaller flow path cross-sectional area than the housing, so the inlet loss in the cylindrical body is large, which is one cause of the reduction in drainage capacity.

[0006] This disclosure provides a connecting member that enables improved drainage capacity. [Means for solving the problem]

[0007] A connecting member according to one aspect of this disclosure is A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet, and a flange extending outward from the upstream end of the cylindrical portion, A second member having a housing portion that accommodates the cylindrical portion and sandwiches the peripheral edge of the inlet in the gutter between itself and the flange, and a connecting cylindrical portion that protrudes from the bottom wall of the housing portion and is connected to the receiving end of the piping member, Equipped with, At least a portion of the housing has a flow path cross-sectional area at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder. In a cross-section passing through the central axis of the connecting cylinder, at least a portion between the bottom surface of the housing's bottom wall opposite to the connecting cylinder and the inner circumferential surface of the connecting cylinder has a fillet portion with a representative radius of curvature of 2 mm or more in the cross-section passing through the central axis of the connecting cylinder, or a chamfered portion with a chamfer dimension of 3 mm or more in the cross-section passing through the central axis of the connecting cylinder.

[0008] A connecting member according to one aspect of this disclosure is A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet, and a flange extending outward from the upstream end of the cylindrical portion, A second member having a housing portion that accommodates the cylindrical portion and sandwiches the peripheral edge of the inlet in the gutter between itself and the flange, and a connecting cylindrical portion that protrudes from the bottom wall of the housing portion and is connected to the receiving end of the piping member, Equipped with, The second member has a reduced diameter section between the bottom wall of the housing and the connecting cylinder, where the inner diameter gradually decreases from the bottom wall of the housing toward the connecting cylinder. At least a portion of the reduced diameter section has a flow path cross-sectional area at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder section, and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder section.

Effects of the Invention

[0009] Aspects of the present disclosure enable reduction of inlet loss without being restricted by the piping member connected to the eaves gutter. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] [Figure 1] Schematic diagram of an eaves gutter drainage structure including the connecting member according to Embodiment 1 [Figure 2] Partial cross-sectional view of an eaves gutter drainage structure including the connecting member according to Embodiment 1 [Figure 3] Perspective view of a first member of the connecting member according to Embodiment 1 [Figure 4] Plan view of a first member of the connecting member according to Embodiment 1 [Figure 5] Bottom view of a first member of the connecting member according to Embodiment 1 [Figure 6] Side view of a first member of the connecting member according to Embodiment 1 [Figure 7] Cross-sectional view of a first member of the connecting member according to Embodiment 1 [Figure 8] Enlarged view of a portion indicated by P1 in FIG. 7 [Figure 9] Perspective view of a second member of the connecting member according to Embodiment 1 [Figure 10] Plan view of a second member of the connecting member according to Embodiment 1 [Figure 11] Partial cross-sectional view of an eaves gutter drainage structure including the connecting member according to Embodiment 2 [Figure 12] Partial cross-sectional view of an eaves gutter drainage structure including the connecting member according to Embodiment 3 [Figure 13] Partial cross-sectional view of an eaves gutter drainage structure including the connecting member according to Embodiment 4 [Figure 14] Plan view of a second member of the connecting member according to Embodiment 4 [Figure 15] Schematic diagram of an eaves gutter drainage structure according to Modification 1 [Figure 16] Schematic diagram of an eaves gutter drainage structure according to Modification 2 [Figure 17]Schematic diagram of the eaves gutter drainage structure according to Modification 3 [Figure 18] Plan view of the second member according to Modification 4 Mode for Carrying Out the Invention

[0011] [1. Embodiment] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings as appropriate. However, the following embodiments are examples for describing the present disclosure, and are not intended to limit the present disclosure to the following contents (for example, the shape, size, arrangement, etc. of each component). Unless otherwise specified, positional relationships such as up, down, left, and right shall be based on the positional relationships shown in the drawings. Each of the drawings 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] In the following description, when it is necessary to distinguish a plurality of components from each other, suffixes such as "-1" and "-2" are added to the reference numerals of the components. However, when it is not necessary to distinguish the plurality of components, the suffixes such as "-1" and "-2" may be omitted in consideration of readability of the text.

[0014] [1.1 Embodiment 1] [1.1.1 Configuration] FIG. 1 is a schematic diagram of an eaves gutter drainage structure 100 including a drain 1 according to an embodiment.

[0015] The eaves gutter drainage structure 100 is a piping system for transporting fluids with a Reynolds number of 4000 or higher. Fluids with a Reynolds number of 4000 or higher can be described as fluids whose flow within a cylinder becomes turbulent. Examples of such fluids include liquids (drinking water, heat source water, wastewater, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flow (mixture of liquid and gas). The eaves gutter drainage structure 100 constitutes a rain gutter system that receives rainwater from the roof 210 of a building 200 and directs it to a drain section 310 on the ground 300. The rainwater collected in the drain section 310 flows out of the drain section 310 through an underground pipe 320 into a rainwater pipe. The building 200 is, for example, a non-residential facility such as a shop, office, factory, building, school, welfare facility, or hospital, and a residential facility such as a detached house, apartment building, or individual dwelling units in a detached house or apartment building. Non-residential facilities include theaters, cinemas, public halls, amusement facilities, multi-purpose complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping areas, train stations, and airports. The roof 210 may be a flat roof or a corrugated metal roof. In Figure 1, the roof 210 is a corrugated metal roof.

[0016] The eaves gutter drainage structure 100 comprises a drain 1, an eaves gutter 10, a vertical pipe 11, and a socket 12.

[0017] The gutter 10 receives rainwater from the roof 210 of the building 200. The gutter 10 is installed under the roof 210 of the building 200. For example, the gutter 10 is positioned at the eaves of the roof 210. In particular, the gutter 10 is positioned to extend along the eaves of the roof 210. The gutter 10 is a long, barrel-shaped structure. The 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 called a water collection opening, drainage opening, or outlet. For example, the gutter 10 may be formed by extrusion molding of a resin material. The gutter 10 may have a core material to reinforce the overall strength of the gutter 10. The core material may be, for example, metal. Alternatively, the gutter 10 may be formed from a metal sheet, for example, a steel sheet (also called a coil).

[0018] Drain 1 is positioned at the inlet 10b of the gutter 10. Drain 1 is used to reduce vortex formation and air entrainment at the inlet 10b. Drain 1 also functions as a connecting member for connecting a piping member to the inlet 10b of the gutter 10. The piping member may be, for example, a straight pipe, an elbow, or a socket. In this embodiment, the piping member is a socket 12.

[0019] Figure 2 is a cross-sectional view of a part of the gutter drainage structure 100, including a drain 1 which is a connecting member according to this embodiment. The vertical pipe 11 is not shown in Figure 2. The drain 1 comprises a first member 5 and a second member 6. The first member 5 is an upper member that defines the upper structure of the drain 1, and the second member 6 is a lower member that defines the lower structure of the drain 1.

[0020] Figure 3 is a perspective view of the first member 5 of the drain 1. Figure 4 is a plan view of the first member 5 of the drain 1. Figure 5 is a bottom view of the first member 5 of the drain 1. Figure 6 is a side view of the first member 5 of the drain 1. Figure 7 is a cross-sectional view of the first member 5 of the drain 1. Here, Figure 2 is a cross-sectional view along line AA of Figure 4, and Figure 7 is a cross-sectional view along line BB of Figure 4. Figure 8 is an enlarged view of the portion indicated by P1 in Figure 7.

[0021] The first component 5 comprises a drain pipe portion 2, a funnel portion 3, and one or more blades 4. In this embodiment, the first component 5 comprises five blades 4.

[0022] As shown in Figure 2, the drain pipe section 2 has an upstream end 2a and a downstream end 2b. The drain pipe section 2 further has a drain outlet 2c. The drain outlet 2c is the internal space between the upstream end 2a and the downstream end 2b of the drain pipe section 2.

[0023] As shown in Figures 2 and 3, the drain pipe section 2 comprises a cylindrical section 21, a flange 22, and a connecting section 23.

[0024] The cylindrical portion 21 is cylindrical in shape with a central axis C21. The cylindrical portion 21 has an upstream end 21a and a downstream end 21b. The inner diameter and outer diameter of the cylindrical portion 21 do not change. A male threaded portion 21c is formed on the outer circumferential surface of the cylindrical portion 21.

[0025] The inner diameter Du1 of the cylindrical section 21 defines the inner diameter of the drain outlet 2c. The inner diameter Du1 of the drain outlet 2c may be set appropriately according to the dimensions of the piping connected to the drain 1. The dimensions of the piping, 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".

[0026] Table 1 shows an example of nominal diameters for VP rigid polyvinyl chloride pipes in the JIS K 6741 standard for rigid polyvinyl chloride pipes (general). In Table 1, the units for outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are mm.

[0027] [Table 1]

[0028] Table 2 shows an example of nominal diameters for VU rigid polyvinyl chloride pipes in the JIS K 6741 standard for rigid polyvinyl chloride pipes (general). In Table 2, the units for outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are mm.

[0029] [Table 2]

[0030] The inner diameter Du1 of the cylindrical portion 21 may be set based on an approximate inner diameter corresponding to the nominal diameter of the piping. In this embodiment, the inner diameter Du1 of the cylindrical portion 21 may be set to correspond to a nominal diameter of 75 mm, 100 mm, or 125 mm.

[0031] The flange 22 extends outward from the upstream end 21a of the cylindrical portion 21. More specifically, the flange 22 is located at the upstream end 21a of the cylindrical portion 21 and extends radially outward from the cylindrical portion 21. In this embodiment, the flange 22 is annular in shape with a central axis C22. The central axis C22 of the flange 22 and the central axis C21 of the cylindrical portion 21 coincide, and these define the central axis C2 of the drain pipe portion 2.

[0032] The flange 22 has a first surface 22a on the opposite side of the cylindrical portion 21 in the direction of the central axis C21 of the cylindrical portion 21, and a second surface 22b on the side of the cylindrical portion 21. In Figure 2, the first surface 22a is the upper surface of the flange 22, and the second surface 22b is the lower surface of the flange 22. The first surface 22a constitutes part of the surface that guides water into the cylindrical portion 21, so it is preferable that the surface roughness is small. The second surface 22b is the part of the flange 22 that contacts the upper surface of the bottom wall 10a of the gutter 10. In other words, the second surface 22b defines the mounting surface that is placed on the periphery of the inlet 10b of the gutter 10. The width of the second surface 22b is the effective width of the flange 22 that can be used for locking with the bottom wall 10a of the gutter 10. In this embodiment, the second surface 22b is a flat surface, and the normal of the second surface 22b coincides with the central axis C21 of the cylindrical portion 21.

[0033] As can be seen from Figures 4 and 5, the central axis C2 of the drain pipe section 2 coincides with the central axis C21 of the pipe section 21 and the central axis C22 of the flange 22.

[0034] In the drain pipe section 2, the flange 22 defines the upstream end 2a, and the downstream end 21b of the pipe section 21 defines the downstream end 2b.

[0035] The connecting portion 23 is located between the upstream end 21a of the cylindrical portion 21 and the flange 22. The connecting portion 23 has a reduced diameter portion 24 and an enlarged diameter portion 25.

[0036] The reduced diameter portion 24 is cylindrical with an inner diameter that gradually decreases from the flange 22 toward the cylindrical portion 21. The reduced diameter portion 24 has an upstream end 24a and a downstream end 24b. In the present embodiment, the flange 22 extends outward from the upstream end 24a of the reduced diameter portion 24. The reduced diameter portion 24 enables a reduction in inlet loss compared to the case where the angle between the first surface 22a of the flange 22 and the inner circumferential surface of the cylindrical portion 21 is 90°. In particular, in the present embodiment, the inner diameter of the reduced diameter portion 24 gradually decreases from a value equal to the inner diameter of the flange 22 toward the cylindrical portion 21 from the flange 22 until it reaches a value smaller than the inner diameter Du1 of the cylindrical portion 21. That is, the inner diameter of the reduced diameter portion 24 is minimized at the downstream end of the reduced diameter portion 24. The inner diameter of the reduced diameter portion 24 is the minimum value of the inner diameter of the first member 5. If Du2 is the minimum value of the inner diameter of the reduced diameter portion 24, then Du2 < Du1. Therefore, in a cross-section passing through the central axis C21 of the cylindrical portion 21, the reduced diameter portion 24 enables a reduction in inlet loss compared to the case where the first surface 22a of the flange 22 and the inner circumferential surface of the cylindrical portion 21 are connected by a curved line. In the present embodiment, the outer diameter of the reduced diameter portion 24 gradually decreases from a value equal to the inner diameter of the flange 22 toward the cylindrical portion 21 from the flange 22 until it reaches a value smaller than the outer diameter of the cylindrical portion 21. That is, the outer diameter of the reduced diameter portion 24 is minimized at the downstream end 24b of the reduced diameter portion 24. The minimum value of the outer diameter of the reduced diameter portion 24 is smaller than the outer diameter of the cylindrical portion 21.

[0037] The reduced diameter portion 24 has an inner circumferential surface 241 and an outer circumferential surface 242.

[0038] As shown in Figure 3, the inner circumferential surface 241 of the reduced diameter portion 24 is curved, consisting of one or more circular arcs in a cross-section passing through the central axis C21 of the cylindrical portion 21. If Ri [mm] is a representative value of the radius of curvature defining the inner circumferential surface 241 in a cross-section passing through the central axis C21 of the cylindrical portion 21, then Ri > 10 mm is satisfied. This enables further reduction of inlet loss in the drain 1. Note that the above "representative value" may be the radius of curvature of the longest circular arc among the one or more circular arcs defining the inner circumferential surface 241 in a cross-section passing through the central axis C21 of the cylindrical portion 21. Alternatively, the "representative value" may be the average value of the radii of curvature defining the inner circumferential surface 241 in a cross-section passing through the central axis C21 of the cylindrical portion 21, or the radius of curvature of the circular arc closest to the inner circumferential surface 241 in a cross-section passing through the central axis C21 of the cylindrical portion 21.

[0039] Here, it is preferable that Ri / 3 ≤ Du1 ≤ Du1 - Du2 ≤ Ri / 2 for the inner diameter Du1 of the cylindrical portion 21, the minimum value Du2 of the inner diameter of the reduced diameter portion 24, and the representative value Ri of the radius of curvature defining the inner circumferential surface 241 in the cross-section passing through the central axis C21 of the cylindrical portion 21.

[0040] D [mm] is the maximum inner diameter of the piping member (socket 12 in this embodiment) that can be connected to the inlet 10b. It is preferable that 0.05D ≤ Ri ≤ 0.20D be satisfied. Furthermore, it is preferable that 40 ≤ D ≤ 150 be satisfied. The maximum inner diameter of the piping member that can be connected to the inlet 10b is the inner diameter of the piping member with the largest inner diameter among the piping members that can be connected to the inlet 10b via the drain 1. For example, if two types of piping members are available, one with a nominal diameter of 100 and the other with a nominal diameter of 75, the inner diameter of the piping member with a nominal diameter of 100 will be the maximum inner diameter of the piping member that can be connected to the inlet 10b.

[0041] The outer circumferential surface 242 of the reduced diameter portion 24 is curved, consisting of one or more circular arcs, in a cross-section passing through the central axis C21 of the cylindrical portion 21. For example, the representative value of the radius of curvature defining the outer circumferential surface 242 in a cross-section passing through the central axis C21 of the cylindrical portion 21 can be set based on the representative value of the radius of curvature defining the inner circumferential surface 241 in a cross-section passing through the central axis C21 of the cylindrical portion 21, so that the thickness of the reduced diameter portion 24 becomes as uniform as possible. This can reduce the possibility of sink marks occurring on the outer circumferential surface 242 of the reduced diameter portion 24. Note that the "representative value" of the radius of curvature for the outer circumferential surface 242 may be the radius of curvature of the longest of the one or more circular arcs defining the outer circumferential surface 242, or the average value of the radii of curvature defining the outer circumferential surface 242 in a cross-section passing through the central axis C21 of the cylindrical portion 21, or the radius of curvature of the circular arc closest to the outer circumferential surface 242 in a cross-section passing through the central axis C21 of the cylindrical portion 21.

[0042] The enlarged diameter portion 25 extends outward from the downstream end 24b of the reduced diameter portion 24 and connects to the upstream end 21a of the cylindrical portion 21. The enlarged diameter portion 25 is the part that absorbs the difference between the inner diameter Du1 of the cylindrical portion 21 and the minimum value Du2 of the inner diameter of the reduced diameter portion 24. In this embodiment, the enlarged diameter portion 25 extends from the downstream end 24b of the reduced diameter portion 24 along the radial direction of the central axis C21 of the cylindrical portion 21. The enlarged diameter portion 25 is an annular shape centered on the central axis C21 of the cylindrical portion 21. The outer diameter of the enlarged diameter portion 25 is equal to the outer diameter of the cylindrical portion 21.

[0043] The funnel section 3 is a connecting section that links the five blades 4 together. As shown in Figures 2 and 3, the funnel section 3 is located at the upstream end 2a of the drain pipe section 2. More specifically, the funnel section 3 is positioned opposite the upstream end 2a of the drain pipe section 2, such that the central axis C3 of the funnel section 3 coincides with the central axis C2 of the drain pipe section 2.

[0044] As shown in Figures 2 and 7, the funnel section 3 has a first opening 3a and a second opening 3b. The funnel section 3 directs the fluid flowing in through the first opening 3a to the outlet 2c of the drain pipe section 2 through the second opening 3b.

[0045] The funnel portion 3 has a reduced diameter portion 31, a small diameter cylindrical portion 32, and a flange 33.

[0046] As shown in Figure 7, the reduced diameter portion 31 is cylindrical in shape, with its outer and inner diameters decreasing as it approaches the drain pipe portion 2. The reduced diameter portion 31 can also be described as a hollow frustoconical shape with open ends. The reduced diameter portion 31 has a first surface 311 and a second surface 312. The first surface 311 is the inner circumferential surface of the reduced diameter portion 31. The first surface 311 defines the surface of the reduced diameter portion 31 opposite to the drain pipe portion 2. The second surface 312 is the outer circumferential surface of the reduced diameter portion 31. The second surface 312 defines the surface of the reduced diameter portion 31 facing the drain pipe portion 2. In this embodiment, the maximum outer diameter of the reduced diameter portion 31 is smaller than the inner diameter of the drain pipe portion 2 (the inner diameter of the cylindrical portion 21). In this embodiment, the inclination angle of the first surface 311 of the reduced diameter portion 31 in a cross-section passing through the central axis of the reduced diameter portion 31 is 40 degrees or more and 60 degrees or less.

[0047] The small-diameter cylindrical portion 32 extends from the end of the reduced-diameter portion 31 on the drain pipe portion 2 side (the lower end in Figure 2) towards the drain pipe portion 2. The small-diameter cylindrical portion 32 is cylindrical with less change in inner and outer diameter than the reduced-diameter portion 31. The interior of the small-diameter cylindrical portion 32 is connected to the interior of the reduced-diameter portion 31. The outer and inner circumferential surfaces of the small-diameter cylindrical portion 32 are substantially perpendicular to the central axis of the drain pipe portion 2, and are neither the surface on the drain pipe portion 2 side nor the surface on the opposite side of the drain pipe portion 2.

[0048] The flange 33 extends radially outward from the end of the reduced-diameter portion 31 opposite to the drain pipe portion 2 (the upper end in Figure 7). The flange 33 is plate-shaped and has a first surface 331 and a second surface 332. The first surface 331 is the upper surface of the flange 33. The first surface 331 defines the surface of the flange 33 opposite to the drain pipe portion 2. The second surface 332 is the lower surface of the flange 33. The second surface 332 defines the surface of the flange 33 facing the drain pipe portion 2. The flange 33 is annular. In this embodiment, the outer diameter of the flange 33 is smaller than the inner diameter of the drain pipe portion 2 (the inner diameter of the pipe portion 21).

[0049] As can be seen from Figures 4 and 5, in the funnel portion 3, the opening at the end of the reduced diameter portion 31 opposite to the drain pipe portion 2 is the first opening 3a, and the opening at the end of the small diameter portion 32 on the drain pipe portion 2 side is the second opening 3b.

[0050] As can be seen from Figures 2 and 7, in this embodiment, the funnel portion 3 is not located inside the drain pipe portion 2. Here, in the direction of the central axis C2 of the drain pipe portion 2, the distance between the second opening 3b and the drain pipe portion 2 is preferably less than half the distance between the first opening 3a and the drain pipe portion 2. In this embodiment, the end of the small-diameter cylindrical portion 32 of the funnel portion 3 on the drain pipe portion 2 side (second opening 3b) and the upstream end 2a of the drain pipe portion 2 are on the same plane. In other words, the minimum distance between the funnel portion 3 and the drain pipe portion 2, i.e., the distance between the second opening 3b and the drain pipe portion 2, is 0.

[0051] As can be seen from Figures 4 and 5, the central axis C3 of the funnel portion 3 coincides with the central axis of the reduced diameter portion 31, the central axis of the small diameter cylindrical portion 32, and the central axis of the flange 33.

[0052] In the funnel portion 3, the first surface 311 of the reduced diameter portion 31 and the first surface 331 of the flange 33 constitute the surface of the funnel portion 3 opposite to the drain pipe portion 2. In the funnel portion 3, the second surface 312 of the reduced diameter portion 31 and the second surface 332 of the flange 33 constitute the surface of the funnel portion 3 facing the drain pipe portion 2. Furthermore, the outer circumference 33a of the flange 33 constitutes the outer circumference of the funnel portion 3 when viewed from the direction of the central axis C2 of the drain pipe portion 2.

[0053] Let d be the diameter representing the outer shape of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. Preferably, d is set to satisfy 0.6D ≤ d ≤ 1.5D. In this embodiment, d ≤ 1.0D. Here, the diameter d may be the diameter of the largest circle that tangent to any two points of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, since the funnel portion 3 is circular as viewed from the direction of the central axis C2 of the drain pipe portion 2, the diameter d is equal to the diameter of the funnel portion 3 (especially the diameter of the flange 33) as viewed from the direction of the central axis C2 of the drain pipe portion 2.

[0054] As shown in Figures 3 to 5, in this embodiment, there are five blades 4. The five blades 4 are the same shape. As shown in Figure 4, when viewed from the direction of the central axis C2 of the drain pipe 2, the five blades 4 are arranged at equal intervals around the central axis C2 of the drain pipe 2.

[0055] Each blade 4 protrudes from the upstream end 2a of the drain pipe section 2 in the direction of the central axis C2 of the drain pipe section 2. The blades 4 are connected to each other by the funnel section 3. In this embodiment, five blades 4 are connected to the funnel section 3. More specifically, the blades 4 connect the upstream end 2a of the drain pipe section 2 to the side of the funnel section 3 opposite to the drain pipe section 2. In other words, the funnel section 3 is positioned at the upstream end 2a of the drain pipe section 2 so as to be suspended from the blades 4.

[0056] The wing 4 comprises a main body 41, an arm 42, and a reinforcing part 43.

[0057] The main body portion 41 is plate-shaped. In particular, the main body portion 41 is rectangular plate-shaped. The main body portion 41 protrudes from the upstream end 2a of the drain pipe portion 2. In particular, the main body portion 41 protrudes from the upstream end 2a of the drain pipe portion 2 along the central axis C2 of the drain pipe portion 2. The direction of the central axis C2 of the drain pipe portion 2 corresponds to the height direction of the main body portion 41. The main body portion 41 extends in the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. The radial direction of the drain pipe portion 2 corresponds to the length direction of the main body portion 41. The width direction (thickness direction) of the main body portion 41 is perpendicular to the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. The width of the main body portion 41 defines the width of the blade 4. If the width of the blade 4 is t, it is preferable that the drain 1 satisfies 2 mm ≤ t ≤ 6 mm.

[0058] The main body portion 41 has a first end portion 41a, a second end portion 41b, a third end portion 41c, and a fourth end portion 41d.

[0059] The first end 41a and the second end 41b are the ends of the main body 41 in the longitudinal direction. In particular, the first end 41a is the end of the drain pipe 2 on the side of the central axis C2 when viewed from the direction of the central axis C2 of the drain pipe 2. The second end 41b is the end of the drain pipe 2 on the opposite side of the central axis C2 when viewed from the direction of the central axis C2 of the drain pipe 2.

[0060] As can be seen from Figures 2 and 5, the corner of the first end 41a of the main body 41 is fillet-shaped when viewed from the direction of the central axis C2 of the drain pipe 2. In particular, the corner of the first end 41a of the main body 41 is a convex fillet shape. This makes it less likely for the worker's hand to hurt when touching the corner of the first end 41a when holding the blade 4 during the installation of the drain 1. Therefore, it becomes easier for the worker to hold the blade 4 during the installation of the drain 1. Note that the corner of the first end 41a of the main body 41 may be tapered when viewed from the direction of the central axis C2 of the drain pipe 2.

[0061] In the blade 4, as shown in Figures 2 and 5, the distance between the first end 41a of the main body 41 and the central axis C2 of the drain pipe 2, as viewed from the direction of the central axis C2 of the drain pipe 2, is denoted as b. It is preferable that b is set to satisfy 0.40d ≤ b ≤ 0.75d. When b is 0.40d or greater, the space between the drain pipe 2, the funnel 3, and the blade 4 can be widened while obtaining the flow straightening effect of the blade 4, thereby further suppressing the deterioration of drainage function caused by foreign matter. On the other hand, if b becomes too large, the entire drain 1 will become larger, so it is preferable that b be 0.75d or less.

[0062] In particular, in this embodiment, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located outside the reduced diameter section 31. This allows for a further widening of the space between the drain pipe section 2, the funnel section 3, and the blades 4. Therefore, it is possible to further suppress the deterioration of drainage function caused by foreign matter. In addition, a swirling flow is more likely to occur between the reduced diameter section 31 and the blades 4, and an improvement in drainage function can be expected.

[0063] In particular, in this embodiment, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located outside the flange 33. This configuration allows for a further widening of the space between the drain pipe section 2, the funnel section 3, and the vane 4. Therefore, it is possible to further suppress the deterioration of drainage function caused by foreign matter.

[0064] On the other hand, when viewed from the direction of the central axis C2 of the drain pipe section 2, the first end portion 41a of the main body section 41 is located inside the outlet 2c of the drain pipe section 2. This allows for an improvement in the flow straightening effect of the blades 4.

[0065] As shown in Figures 2 and 7, the first end portion 41a of the main body portion 41 is inclined to move away from the central axis C2 of the drain pipe portion 2 as it approaches the drain pipe portion 2. This allows for a wider space between the drain pipe portion 2, the funnel portion 3, and the blades 4. This further suppresses the deterioration of drainage function caused by foreign matter.

[0066] As can be seen from Figures 3 and 4, when viewed from the direction of the central axis C2 of the drain pipe section 2, the corners (both corners in this embodiment) of the second end 41b of the main body section 41 are fillet-shaped. In particular, the corners of the second end 41b of the main body section 41 are convex fillet-shaped. This makes it less likely for a worker's hand to hurt when touching the corners of the second end 41b when holding the blades 4 during the installation of the drain 1. Therefore, it becomes easier for a worker to hold the blades 4 during the installation of the drain 1. Note that when viewed from the direction of the central axis C2 of the drain pipe section 2, the corners of the second end 41b of the main body section 41 may be tapered.

[0067] The third end 41c and the fourth end 41d are the ends of the main body 41 in the height direction. In particular, the third end 41c is the end opposite to the drain pipe 2 in the direction of the central axis C2 of the drain pipe 2. The fourth end 41d is the end on the drain pipe 2 side in the direction of the central axis C2 of the drain pipe 2.

[0068] The third end portion 41c is further from the drain pipe portion 2 than the first surface 331 of the flange 33 of the funnel portion 3, in the direction of the central axis C2 of the drain pipe portion 2. In the direction of the central axis C2 of the drain pipe portion 2, the distance between the end portion (third end portion 41c) of one or more blades 4 opposite to the drain pipe portion 2 and the surface of the funnel portion 3 opposite to the drain pipe portion 2 (first surface 331 of the flange 33) is 5 mm or more and 15 mm or less. That is, as shown in Figure 6, if a1 is the distance between the end portion (third end portion 41c) of one or more blades 4 opposite to the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2 and the drain pipe portion 2, and a2 is the distance between the surface of the funnel portion 3 opposite to the drain pipe portion 2 (first surface 331) and the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2, then the condition 5 mm ≤ a1 - a2 ≤ 15 mm is satisfied. Here, if we let a1-a2=a, then a represents the distance between the end of the blade 4 opposite to the drain pipe section 2 (third end 41c) and the surface of the funnel section 3 opposite to the drain pipe section 2 (first surface 331) in the direction of the central axis C2 of the drain pipe section 2. This makes it possible to improve the strength of the connection between the funnel section 3 and the blade 4. Here, it is more preferable that a(=a1-a2)=9mm.

[0069] The fourth end portion 41d is also the portion of the main body 41 that is connected to the drain pipe portion 2.

[0070] In the direction of the central axis C2 of the drain pipe section 2, the main body section 41 is connected to the flange 22 and the connecting section 23 of the drain pipe section 2. Since the main body section 41 extends not only to the flange 22 of the drain pipe section 2 but also to the connecting section 23, the strength of the blade 4 can be maintained.

[0071] In this embodiment, as shown in Figures 4 and 6, the main body portion 41 has fillets 41e, 41e at the end (fourth end portion 41d) on the drain pipe portion 2 side, which increase the width of the main body portion 41 as it approaches the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, the fillets 41e, 41e are located on both sides in the width direction of the main body portion 41. The surface of the fillets 41e is concave. The fillets 41e enable improved strength of the vanes 4 against the drain pipe portion 2. In this embodiment, as shown in Figures 4 and 7, the fillets 41e extend along the main body portion 41 and, like the main body portion 41, extend not only to the flange 22 of the drain pipe portion 2 but also to the connecting portion 23. The fillets 41e include a first portion 41e1 on the flange 22 and a second portion 41e2 on the connecting portion 23. In particular, in the second portion 41e2, at least one of the radius of curvature or width of the fillet 41e decreases from the second end 41b to the first end 41a of the main body 41. This allows for improved drainage function by the fillet 41e. In the second portion 41e2, the radius of curvature or width of the fillet 41e may be reduced to 0.

[0072] The arm portion 42 connects the funnel portion 3 to the main body portion 41 on the side opposite to the drain pipe portion 2 (first surface 311, 331). The arm portion 42 protrudes toward the funnel portion 3 from the end of the main body portion 41 opposite to the drain pipe portion 2 (third end portion 41c). When viewed from the direction of the central axis C2 of the drain pipe portion 2, the arm portion 42 extends in the radial direction of the drain pipe portion 2. The width direction of the arm portion 42 is perpendicular to the radial direction of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. As an example, the width of the arm portion 42 is preferably 2 mm or more and 6 mm or less.

[0073] As shown in Figures 2 to 4, the arm portion 42 extends from the main body portion 41 to the first surface 331 of the flange 33 and the first surface 311 of the reduced diameter portion 31 of the funnel portion 3. The arm portion 42 connects the flange 33 and the reduced diameter portion 31 to the main body portion 41. In other words, the arm portion 42 has a first portion 42a and a second portion 42b. The first portion 42a is the part of the arm portion 42 that is connected to the flange 33. The second portion 42b is the part of the arm portion 42 that is connected to the reduced diameter portion 31. The height of the first portion 42a relative to the drain pipe portion 2 does not change as it approaches the center of the reduced diameter portion 31. The height of the second portion 42b relative to the drain pipe portion 2 decreases as it approaches the center of the reduced diameter portion 31. The height of the first part 42a or the second part 42b relative to the drain pipe section 2 is the distance between the end of the first part 42a or the second part 42b opposite to the drain pipe section 2 in the direction of the central axis C2 of the drain pipe section 2 and the drain pipe section 2. This makes it possible to increase the inflow of rainwater into the funnel section 3. Furthermore, even when rainwater flows into the funnel section 3, the possibility of vortex formation in the drain pipe section 2 can be reduced.

[0074] As shown in Figures 2 and 4, let c be the length of the connection between the arm portion 42 and the funnel portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, c is equal to the distance between the tip of the arm portion 42 and the outer circumference of the funnel portion 3 (outer circumference 33a of the flange 33) as viewed from the direction of the central axis C2 of the drain pipe portion 2. It is preferable that c be set to satisfy 0.1d ≤ c ≤ 0.5D. When c is 0.1d or greater, it is possible to improve the strength of the connection between the funnel portion 3 and the blade 4. When c is 0.5D or less, it is possible to form a first opening 3a and a second opening 3b of sufficient size in the funnel portion 3. As shown in Figures 2 and 4, let e be the distance between the tip of the arm portion 42 and the central axis C2 of the drain pipe portion 2 as viewed from the direction of the central axis C2 of the drain pipe portion 2. It is preferable that e ≤ 0.25d. This is possible to improve the strength of the connection between the funnel portion 3 and the blade 4.

[0075] In this embodiment, as shown in Figures 4 and 7, the width of the arm portion 42 increases as it approaches the central axis C2 of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. In particular, at the tip portion of the second portion 42b of the arm portion 42, the width of the arm portion 42 increases as it approaches the central axis C2 of the drain pipe portion 2 when viewed from the direction of the central axis C2 of the drain pipe portion 2. This makes it possible to improve the strength of the connection between the funnel portion 3 and the blades 4. The minimum width of the arm portion 42 is equal to the width of the main body portion 41.

[0076] In this embodiment, as shown in Figures 4, 7, and 8, the arm portion 42 has fillets 42c, 42c at the end (lower end) on the drain pipe portion 2 side, such that the width of the arm portion 42 increases as it approaches the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2. In this embodiment, the fillets 42c, 42c are located on both sides of the arm portion 42 in the width direction. The surface of the fillets 42c is concave. The fillets 42c enable improved strength of the connection between the funnel portion 3 and the blades 4. In this embodiment, as shown in Figures 4 and 7, the fillets 42c extend along the arm portion 42 and, like the arm portion 42, extend not only to the flange 33 of the funnel portion 3 but also to the reduced diameter portion 31. In particular, at the tip of the fillets 42c, at least one of the radius of curvature or width of the fillets 42c decreases as it approaches the central axis C2 of the funnel portion 3. This enables improved drainage function by the fillets 42c. At the tip of the fillet 42c, the radius of curvature or width of the fillet 42c may be reduced to 0.

[0077] The reinforcing portion 43 is provided to improve the strength of the blade 4. As shown in FIG. 4, when viewed from the direction of the central axis C2 of the drainage cylinder portion 2, the reinforcing portion 43 is located at a position overlapping the outer peripheral portion of the funnel portion 3 (the outer peripheral portion 33a of the flange 33). The width direction of the reinforcing portion 43 is orthogonal to the radial direction of the drainage cylinder portion 2 when viewed from the direction of the central axis C2 of the drainage cylinder portion 2. As can be particularly understood from FIG. 8, the width of the reinforcing portion 43 increases as it approaches the funnel portion 3 (the flange 33) in the direction of the central axis C2 of the drainage cylinder portion 2. When a force is applied to the funnel portion 3 or the blade 4, stress tends to concentrate on a portion of the blade 4 corresponding to the outer peripheral portion of the funnel portion 3. Therefore, the provision of the reinforcing portion 43 can reduce the possibility of damage to the blade 4 caused by such stress. Let the maximum value of the width of the reinforcing portion 43 be t1. It is preferable that t1 is set so as to satisfy 1.1t<t1<1.4t.

[0078] In the present embodiment, referring to FIG. 2 and FIG. 3, in the direction of the central axis C2 of the drainage cylinder portion 2, the surface 43a of the reinforcing portion 43 on the drainage cylinder portion 2 side is farther from the drainage cylinder portion 2 than the surface of the outer peripheral portion of the funnel portion 3 on the drainage cylinder portion 2 side (the second surface 332 of the flange 33). In FIG. 2, the position of the surface 43a of the reinforcing portion 43 on the drainage cylinder portion 2 side is indicated by h1, and the position of the surface of the outer peripheral portion of the funnel portion 3 on the drainage cylinder portion 2 side (the second surface 332 of the flange 33) is indicated by h2. This makes it easier for the reinforcing portion 43 to absorb stress when a force is applied to the funnel portion 3 or the blade 4, thereby reducing the possibility of damage to the blade 4.

[0079] In the present embodiment, the reinforcing portion 43 is located between the main body portion 41 and the arm portion 42 when viewed from the direction of the central axis C2 of the drainage cylinder portion 2. When a force is applied to the funnel portion 3 or the blade 4, stress tends to concentrate on the connection portion between the main body portion 41 and the arm portion 42 in the blade 4. Therefore, the provision of the reinforcing portion 43 can reduce the possibility of damage to the blade 4 caused by such stress.

[0080] In this embodiment, the reinforcing portion 43 is positioned to overlap with the outer circumference of the funnel portion 3 (the outer circumference 33a of the flange 33) when viewed from the direction of the central axis C2 of the drain pipe portion 2. Furthermore, in the direction of the central axis C2 of the drain pipe portion 2, the surface 43a of the reinforcing portion 43 on the drain pipe portion 2 side is further away from the drain pipe portion 2 than the surface on the outer circumference of the funnel portion 3 on the drain pipe portion 2 side (the second surface 332 of the flange 33). As a result, as shown in Figure 2, there is a gap G between the main body portion 41 and the end of the outer circumference of the funnel portion 3 on the drain pipe portion 2 side. Due to this gap G, the blades 4 do not come into contact with the radially outer end of the drain pipe portion 2 on the second surface 332 of the flange 33. Due to this gap G, the main body portion 41 of the blades 4 and the flange 33 of the funnel portion 3 are spaced apart from each other in the radial direction of the drain pipe portion 2. Therefore, the space between the drain pipe section 2, the funnel section 3, and the blades 4 can be widened, making it possible to further suppress the deterioration of drainage function caused by foreign matter. In particular, the presence of the gap G makes it easier for swirling flow to occur between the reduced diameter section 31 and the blades 4, and an improvement in drainage function can be expected.

[0081] In this embodiment, as shown in Figure 2, the blades 4 do not come into contact with the surface of the funnel portion 3 on the drain pipe portion 2 side (second surfaces 312, 332). Therefore, the space between the funnel portion 3 and the drain pipe portion 2 can be widened, reducing the possibility of foreign objects getting stuck. Thus, the drain 1 enables improved flow straightening and suppression of the deterioration of drainage function caused by foreign objects. In particular, in this embodiment, the blades 4 are not located between the funnel portion 3 and the drain pipe portion 2. Therefore, the space between the funnel portion 3 and the drain pipe portion 2 can be widened even further, further reducing the possibility of foreign objects getting stuck. Thus, the drain 1 enables further suppression of the deterioration of drainage function caused by foreign objects.

[0082] Refer again to Figures 2 and 3. The second member 6 is used to connect the drain 1 and the gutter 10.

[0083] Figure 9 is a perspective view of the second member 6. Figure 10 is a plan view of the second member 6. The second member 6 has a housing portion 61 and a connecting cylinder portion 62.

[0084] The housing portion 61 houses the cylindrical portion 21 and sandwiches the peripheral edge of the inlet 10b of the gutter 10 between itself and the flange 22. The housing portion 61 has a cylindrical portion 611, a flange 612, a connecting portion 613, and a bottom wall 614.

[0085] The cylindrical portion 611 is cylindrical in shape. The cylindrical portion 611 has an upstream end 611a and a downstream end 611b. A female threaded portion 611c is formed on the inner circumferential surface of the cylindrical portion 611. The inner diameter of the cylindrical portion 611 is larger than the outer diameter of the cylindrical portion 21 of the drain pipe portion 2 of the first member 5. The cylindrical portion 611 is sized to accommodate the cylindrical portion 21. The female threaded portion 611c of the cylindrical portion 611 corresponds to the male threaded portion 21c of the drain pipe portion 2 of the first member 5.

[0086] The flange 612 is located at the upstream end 611a of the cylindrical portion 611 and extends radially outward from the cylindrical portion 611. The flange 612 sandwiches the periphery of the inlet 10b of the gutter 10 between itself and the flange 22.

[0087] The connecting portion 613 is located between the upstream end 611a of the cylindrical portion 611 and the flange 612. The connecting portion 613 is cylindrical in shape, with its inner diameter gradually increasing from the cylindrical portion 611 towards the flange 612.

[0088] The bottom wall 614 covers the opening at the downstream end 611b of the cylindrical portion 611. In this embodiment, the bottom wall 614 has a circular opening.

[0089] The connecting cylinder portion 62 protrudes from the bottom wall 614 of the housing portion 61 and is connected to the receiving port of the piping member (socket 12). The connecting cylinder portion 62 is cylindrical with a smaller outer and inner diameter than the cylinder portion 611. The connecting cylinder portion 62 protrudes from the opening edge of the bottom wall 614 along the central axis C61 of the cylinder portion 611. The internal space of the connecting cylinder portion 62 and the internal space of the housing portion 61 are connected. In this embodiment, the central axis C62 of the connecting cylinder portion 62 coincides with the central axis C61 of the cylinder portion 611.

[0090] In the second component 6, the volume of the housing portion 61 is larger than the volume of the connecting pipe portion 62. This allows the housing portion 61 to function as a water storage section for rainwater from the gutter 10 (a buffer tank that facilitates siphon activation). The accumulation of rainwater in the housing portion 61 makes it easier to create a full-water state downstream of the housing portion 61. Therefore, the occurrence of the siphon phenomenon in the drain 1 can be promoted, improving the drainage capacity.

[0091] In particular, it is preferable that at least a portion of the housing portion 61 has a flow path cross-sectional area at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder portion 62, and has a length of 10 mm or more in the direction of the central axis C62 of the connecting cylinder portion 62. In other words, if the flow path cross-sectional area of ​​the connecting cylinder portion 62 is A, it is preferable that the housing portion 61 has a portion where the flow path cross-sectional area is 1.1A or more. In this embodiment, the flow path cross-sectional area of ​​the cylinder portion 611 is at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder portion 62, and the cylinder portion 611 has a length of 10 mm or more in the direction of the central axis C62 of the connecting cylinder portion 62. This promotes the occurrence of the siphon effect and enables an improvement in drainage capacity.

[0092] The second member 6 further has a chamfered portion 63. The chamfered portion 63 is located in at least a portion of the area between the bottom surface 614a of the bottom wall 614 of the housing portion 61 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62. In this embodiment, as shown in Figure 10, the chamfered portion 63 is located in the entire area between the bottom surface 614a of the bottom wall 614 of the housing portion 61 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62. In other words, when viewed from the direction of the central axis C62 of the connecting cylinder portion 62, the circumference of the chamfered portion 63 is equal to the circumference of the connecting cylinder portion 62. The circumference of the chamfered portion 63 may be less than or equal to the circumference of the connecting cylinder portion 62, but it is preferable that it be 0.5 times or more the circumference of the connecting cylinder portion 62.

[0093] The chamfered portion 63 has a chamfer dimension of 3 mm or more in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. The chamfer dimension can be defined as the dimension of the chamfered portion 63 in the direction of the central axis C62 or in the direction perpendicular to the central axis C62 in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. A chamfer dimension of 10 mm or more is more preferable.

[0094] Because the second component 6 has a chamfered portion 63, inlet loss is reduced, making it easier for rainwater to drain smoothly from the housing portion 61 to the connecting pipe portion 62. This configuration enables improved drainage capacity.

[0095] In this embodiment, the inner diameter Dd of the connecting pipe portion 62 is smaller than the minimum inner diameter of the first member 5, that is, the minimum inner diameter Du2 of the reduced diameter portion 24. As a result, the amount of rainwater flowing into the housing portion 61 of the drain 1 from the gutter 10 is more likely to be greater than the amount of rainwater flowing out from the housing portion 61 to the connecting pipe portion 62, causing rainwater to accumulate in the housing portion 61. In other words, the accumulation of rainwater in the housing portion 61 makes it easier to create a full-water state downstream of the housing portion 61. Therefore, the occurrence of the siphon effect in the drain 1 can be promoted, enabling an improvement in drainage capacity.

[0096] In the second member 6, the outer diameter of the cylindrical portion 611 is larger than the outer diameter of the connecting cylindrical portion 62. In particular, the cylindrical portion 611 is cylindrical and at least one size larger than the connecting cylindrical portion 62. This makes it possible to use the housing portion 61 to connect to a piping member that is at least one size larger than the piping member that can be connected to the connecting cylindrical portion 62. In other words, the second member 6 has cylindrical portions with different outer diameters (cylindrical portion 611 and connecting cylindrical portion 62), which allows connection to piping members of different sizes. For example, the cylindrical portion 611 may correspond to a piping member with a nominal diameter of 100, and the connecting cylindrical portion 62 may correspond to a piping member with a nominal diameter of 75.

[0097] In the gutter drainage structure 100, the drain 1 is attached to the gutter 10 as follows. As shown in Figure 2, the first member 5 of the drain 1 is positioned from the upper side of the gutter 10 at the inlet 10b of the gutter 10. As a result, the cylindrical portion 21 of the drain pipe 2 is located below the inlet 10b of the bottom wall 10a of the gutter 10, and the flange 22 of the drain pipe 2, at its second surface 22b, contacts the upper surface of the peripheral edge of the inlet 10b of the bottom wall 10a of the gutter 10. After this, the second member 6 is attached to the first member 5 from the lower side of the gutter 10. The second member 6 is attached to the cylindrical portion 21 of the drain pipe 2 below the inlet 10b. More specifically, the downstream end 21b of the cylindrical portion 21 of the drain pipe 2 of the first member 5 is inserted into the cylindrical portion 611 of the second member 6. As a result, the male threaded portion 21c of the cylindrical portion 21 engages with the female threaded portion 611c of the cylindrical portion 611. From this point, as the second member 6 is rotated relative to the first member 5, the flange 612 of the second member 6 eventually comes into contact with the lower surface of the peripheral edge of the inlet 10b of the bottom wall 10a of the gutter 10. In this way, the drain 1 is attached to the gutter 10 by the first member 5 and the second member 6 sandwiching the peripheral edge of the inlet 10b of the gutter 10 from both above and below.

[0098] In the drain 1 described above, the second component 6 functions as a buffer tank that facilitates siphon activation, and furthermore, it is possible to improve drainage capacity while enabling compatibility with different types of piping components.

[0099] Refer to Figure 1 again. The vertical pipe 11 defines the vertical flow path. The vertical pipe 11 is fixed to the wall 220 of the building 200. In a rain gutter system, the vertical pipe 11 is also called a downpipe. The vertical pipe 11 is installed to drain rainwater from the inlet 10b. The vertical pipe 11 allows rainwater from the inlet 10b to flow vertically. The vertical pipe 11 is straight. The cross-section perpendicular to the central axis of the vertical pipe 11 is circular. The vertical pipe 11 is positioned so that the direction of the central axis of the vertical pipe 11 coincides with the vertical direction. The vertical pipe 11 has an upstream end 11a and a downstream end 11b. The upstream end 11a is the end of the vertical pipe 11 that is connected to the inlet 10b (the upper end in Figure 1). The downstream end 11b is the end of the vertical pipe 11 that is inserted into the manhole 310 (the lower end in Figure 1). In Figure 1, a pipe cover 11c is positioned to prevent rainwater from flowing into the manhole 310 through the gap between the vertical pipe 11 and the manhole 310. The length of the vertical pipe 11 is preferably 3m or more.

[0100] Socket 12 connects the drain 1 and the vertical pipe 11. In the drain 1, the connecting cylindrical portion 62 of the second member 6 forms a fitting portion that fits into the receiving end of the piping member. Therefore, the connecting cylindrical portion 62 of the second member 6 is connected to the upstream receiving end of the socket 12. The upstream receiving end of the socket 12 is in contact with the bottom wall 614 of the housing portion 61. In this way, the drain 1 is connected to the socket 12, which is a piping member. On the other hand, the upstream end 11a of the vertical pipe 11 is connected to the downstream receiving end of the socket 12. In this way, the drain 1 and the vertical pipe 11 are connected by the socket 12.

[0101] For example, the material of the vertical pipe 11 and the socket 12 is rigid polyvinyl chloride. The dimensions of the vertical pipe 11, 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". The dimensions of the socket 12, for example, the outer diameter and thickness, may be set in accordance with the standard for sockets of JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage".

[0102] [1.1.2 Effects, etc.] The drain 1 described above is a connecting member for connecting a piping member (socket 12) to the inlet 10b of the gutter 10, and comprises a first member 5 having a cylindrical portion 21 positioned at the inlet 10b and a flange 22 extending outward from the upstream end 21a of the cylindrical portion 21, and a second member 6 having a housing portion 61 that houses the cylindrical portion 21 and sandwiches the peripheral edge of the inlet 10b in the gutter 10 between itself and the flange 22, and a connecting cylindrical portion 62 that protrudes from the bottom wall 614 of the housing portion 61 and is connected to the receiving end of the piping member (socket 12). At least a part of the housing portion 61 has a flow path cross-sectional area 1.1 times or more that of the flow path cross-sectional area of ​​the connecting cylindrical portion 62, and has a length of 10 mm or more in the direction of the central axis C62 of the connecting cylindrical portion 62. At least a portion of the bottom wall 614 of the housing portion 61, between the bottom surface 614a on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62, has a chamfered portion 63 with a chamfer dimension of 3 mm or more in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. This configuration enables improved drainage capacity.

[0103] In the connecting member (drain 1), at least a portion of the housing portion 61 (the cylindrical portion 611) is cylindrical and at least one size larger than the connecting cylindrical portion 62. This configuration makes it possible to use the housing portion 61 for connecting to a piping member that is at least one size larger than the piping member that can be connected to the connecting cylindrical portion 62.

[0104] In the connecting member (drain 1), the first member 5 has a male threaded portion 21c on the outer circumferential surface of the cylindrical portion 21, and the second member 6 has a female threaded portion 611c located inside the housing portion 61 that connects to the male threaded portion 21c. This configuration facilitates the connection between the first member 5 and the second member 6.

[0105] In the connecting member (drain 1), the inner diameter Dd of the connecting pipe portion 62 is smaller than the minimum value Du2 of the inner diameter of the first member 5. This configuration promotes the occurrence of the siphon effect and enables improved drainage capacity.

[0106] The connecting member (drain 1) comprises a drain pipe section 2 having a cylindrical section 21 and a flange 22, five or more vanes 4 protruding from the upstream end 2a of the drain pipe section 2 in the direction of the central axis C2 of the drain pipe section 2, and a connecting section (funnel section 3) that connects the five or more vanes 4 together. This configuration enables improved flow straightening and suppression of a decrease in drainage function caused by foreign matter.

[0107] In the connecting member (drain 1), the circumference of the chamfered portion 63, when viewed from the direction of the central axis C62 of the connecting cylinder portion 62, is 0.5 times or more the circumference of the connecting cylinder portion 62. This configuration enables improved drainage capacity.

[0108] [1.2 Embodiment 2] [1.2.1 Structure] Figure 11 is a cross-sectional view of a part of the gutter drainage structure 100A, including the drain 1A which is a connecting member according to Embodiment 2.

[0109] Drain 1A comprises a first member 5 and a second member 6A.

[0110] The second member 6A has a housing portion 61 and a connecting cylinder portion 62, but instead of a chamfered portion 63, it has a fillet portion 63A. The fillet portion 63A is located in at least a portion of the space between the bottom surface 614a of the bottom wall 614 of the housing portion 61 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62. In this embodiment, the fillet portion 63A is located in the entire space between the bottom surface 614a of the bottom wall 614 of the housing portion 61 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62. In other words, when viewed from the direction of the central axis C62 of the connecting cylinder portion 62, the circumference of the fillet portion 63A is equal to the circumference of the connecting cylinder portion 62. The circumference of the fillet portion 63A may be less than or equal to the circumference of the connecting cylinder portion 62, but it is preferable that it be 0.5 times or more the circumference of the connecting cylinder portion 62.

[0111] The fillet portion 63A has a representative radius of curvature of 2 mm or more in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. The representative radius of curvature of the fillet portion 63A may be the radius of curvature of the longest arc among the one or more arcs that define the fillet portion 63A in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. Alternatively, the representative radius of curvature of the fillet portion 63A may be the average value of the radii of curvature that define the fillet portion 63A in the cross-section passing through the central axis C62 of the connecting cylinder portion 62, or the radius of curvature of the arc closest to the fillet portion 63A in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. It is more preferable that the representative radius of curvature of the fillet portion 63A is 10 mm or more.

[0112] Because the second member 6A has a fillet portion 63A, inlet loss is reduced, making it easier for rainwater to drain smoothly from the housing portion 61 to the connecting pipe portion 62. This configuration enables improved drainage capacity.

[0113] [1.2.2 Effects, etc.] The drain 1A described above is a connecting member for connecting a piping member (socket 12) to the inlet 10b of the gutter 10, and comprises a first member 5 having a cylindrical portion 21 positioned at the inlet 10b and a flange 22 extending outward from the upstream end 21a of the cylindrical portion 21, and a second member 6A having a housing portion 61 that houses the cylindrical portion 21 and sandwiches the peripheral edge of the inlet 10b in the gutter 10 between itself and the flange 22, and a connecting cylindrical portion 62 that protrudes from the bottom wall 614 of the housing portion 61 and is connected to the receiving end of the piping member (socket 12). At least a part of the housing portion 61 has a flow path cross-sectional area 1.1 times or more that of the flow path cross-sectional area of ​​the connecting cylindrical portion 62, and has a length of 10 mm or more in the direction of the central axis of the connecting cylindrical portion 62. At least a portion of the bottom wall 614 of the housing portion 61, between the bottom surface 614a on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62, has a fillet portion 63A with a representative radius of curvature of 2 mm or more in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. This configuration enables improved drainage capacity.

[0114] In the connecting member (drain 1A), the circumference of the fillet portion 63A, viewed from the direction of the central axis C62 of the connecting cylinder portion 62, is 0.5 times or more the circumference of the connecting cylinder portion 62. This configuration enables improved drainage capacity.

[0115] [1.3 Embodiment 3] Figure 12 is a cross-sectional view of a part of the gutter drainage structure 100B, including the drain 1B which is a connecting member according to Embodiment 3.

[0116] Drain 1B comprises a first member 5 and a second member 6B.

[0117] The second member 6B has a housing portion 61B, a connecting cylinder portion 62, and a reduced diameter portion 64.

[0118] The housing portion 61B has a cylindrical portion 611, a flange 612, and a connecting portion 613.

[0119] The reduced diameter section 64 is located between the housing section 61B and the connecting cylinder section 62. More specifically, the reduced diameter section 64 connects the downstream end 611b of the cylinder section 611 and the upstream end of the connecting cylinder section 62. The reduced diameter section 64 is cylindrical. The inner diameter of the reduced diameter section 64 gradually decreases from the housing section 61 towards the connecting cylinder section 62. In this embodiment, the inner diameter of the reduced diameter section 64 decreases from a value equal to the inner diameter of the cylinder section 611 of the housing section 61 to a value equal to the inner diameter Dd of the connecting cylinder section 62.

[0120] Here, the inner diameter of the reduced-diameter portion 64 decreases from a value equal to the inner diameter of the cylindrical portion 611 of the housing portion 61B to a value equal to the inner diameter Dd of the connecting cylindrical portion 62. Therefore, at least a portion of the reduced-diameter portion 64 (the portion where the inner diameter of the reduced-diameter portion 64 is √1.1 times or more the inner diameter Dd of the connecting cylindrical portion 62) will have a flow path cross-sectional area of ​​1.1 times or more the flow path cross-sectional area of ​​the connecting cylindrical portion 62. In this embodiment, the reduced-diameter portion 64 is set such that the length of the portion of the reduced-diameter portion 64 having a flow path cross-sectional area of ​​1.1 times or more the flow path cross-sectional area of ​​the connecting cylindrical portion 62 in the direction of the central axis C62 of the connecting cylindrical portion 62 is 10 mm or more.

[0121] This allows the reduced-diameter section 64 to function as a water storage section (buffer tank that facilitates siphon activation) for rainwater from the gutter 10. The accumulation of rainwater in the reduced-diameter section 64 and the housing section 61B makes it easier to create a full-water state downstream of the reduced-diameter section 64. Therefore, the siphon phenomenon in the drain 1B is promoted, improving drainage capacity. Furthermore, the reduced-diameter section 64 reduces inlet loss to the connecting pipe section 62, allowing rainwater to drain more smoothly from the housing section 61B to the connecting pipe section 62. This configuration enables improved drainage capacity.

[0122] [1.4 Embodiment 4] [1.4.1 Configuration] Figure 13 is a cross-sectional view of a part of the gutter drainage structure 100C, including the drain 1C which is a connecting member according to Embodiment 4.

[0123] The drain 1C comprises a first member 5 and a second member 6C.

[0124] The second member 6C has a housing portion 65 and a connecting cylinder portion 62.

[0125] The housing portion 65 comprises a cylindrical portion 651, an upper wall 652, a bottom wall 653, and a connecting portion 654.

[0126] The cylindrical portion 651 is rectangular in shape. Figure 14 is a plan view of the second member 6C. As shown in Figure 14, in plan view, the cylindrical portion 651 is rectangular. The cylindrical portion 651 has an upstream end 651a and a downstream end 651b. The cylindrical portion 611 is sized to accommodate the cylindrical portion 21.

[0127] The upper wall 652 covers the opening at the upstream end 651a of the cylindrical portion 651. In this embodiment, the upper wall 652 has a circular opening.

[0128] The bottom wall 653 covers the opening at the downstream end 651b of the cylindrical portion 651. In this embodiment, the bottom wall 653 has a circular opening.

[0129] The connecting portion 654 protrudes into the housing portion 65 from the upper wall 652 of the housing portion 65. The connecting portion 654 is cylindrical in shape with an inner diameter larger than that of the cylindrical portion 21. The connecting portion 654 protrudes from the opening edge of the upper wall 652 along the central axis of the cylindrical portion 651. The internal space of the connecting portion 654 and the internal space of the housing portion 65 are connected. In this embodiment, the central axis of the connecting portion 654 coincides with the central axis of the cylindrical portion 651. A female threaded portion 654a is formed on the inner circumferential surface of the connecting portion 654. The female threaded portion 654a of the connecting portion 654 corresponds to the male threaded portion 21c of the drain pipe portion 2 of the first member 5.

[0130] The connecting cylinder portion 62 protrudes from the bottom wall 653 of the housing portion 65 and is connected to the receiving port of the piping member (socket 12). The connecting cylinder portion 62 protrudes from the opening edge of the bottom wall 653 along the central axis of the cylinder portion 651. The internal space of the connecting cylinder portion 62 and the internal space of the housing portion 65 are connected. In this embodiment, the central axis C62 of the connecting cylinder portion 62 coincides with the central axis C651 of the cylinder portion 651.

[0131] In the second component 6C, the volume of the housing 65 is larger than the volume of the connecting pipe 62. This allows the housing 65 to function as a water storage area for rainwater from the gutter 10 (a buffer tank that facilitates siphon activation). The accumulation of rainwater in the housing 65 makes it easier to create a full-water state downstream of the housing 65. Therefore, the siphon phenomenon can be promoted in the drain 1, improving the drainage capacity.

[0132] In particular, it is preferable that at least a portion of the housing portion 65 has a flow path cross-sectional area at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder portion 62 and a length of 10 mm or more in the direction of the central axis C62 of the connecting cylinder portion 62. In other words, if the flow path cross-sectional area of ​​the connecting cylinder portion 62 is A, it is preferable that the housing portion 65 has a portion where the flow path cross-sectional area is 1.1A or more. In this embodiment, the flow path cross-sectional area of ​​the cylinder portion 651 is at least 1.1 times the flow path cross-sectional area of ​​the connecting cylinder portion 62, and the cylinder portion 651 has a length of 10 mm or more in the direction of the central axis C62 of the connecting cylinder portion 62. This promotes the occurrence of the siphon effect and enables an improvement in drainage capacity.

[0133] The second member 6C further has a chamfered portion 63. The chamfered portion 63 is located in at least a portion of the area between the bottom surface 653a of the bottom wall 653 of the housing portion 65 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62. In this embodiment, as shown in Figure 14, the chamfered portion 63 is located in the entire area between the bottom surface 653a of the bottom wall 653 of the housing portion 65 on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62.

[0134] The second component 6C has a chamfered portion 63, which reduces inlet loss, allowing rainwater to drain more smoothly from the housing portion 65 to the connecting pipe portion 62. This configuration enables improved drainage capacity.

[0135] In the gutter drainage structure 100C, the drain 1C is attached to the gutter 10 as follows. As shown in Figure 13, the first member 5 of the drain 1C is positioned from the upper side of the gutter 10 at the inlet 10b of the gutter 10. As a result, the cylindrical portion 21 of the drain pipe 2 is located below the inlet 10b of the bottom wall 10a of the gutter 10, and the flange 22 of the drain pipe 2, at its second surface 22b, contacts the upper surface of the peripheral edge of the inlet 10b of the bottom wall 10a of the gutter 10. After this, the second member 6C is attached to the first member 5 from the lower side of the gutter 10. The second member 6C is attached to the cylindrical portion 21 of the drain pipe 2 below the inlet 10b. More specifically, the downstream end 21b of the cylindrical portion 21 of the drain pipe 2 of the first member 5 is inserted into the joint 654 of the second member 6C. As a result, the male threaded portion 21c of the cylindrical portion 21 engages with the female threaded portion 654a of the connecting portion 654. From this point, as the second member 6C is rotated relative to the first member 5, the upper wall 652 of the second member 6C eventually comes into contact with the lower surface of the peripheral edge of the inlet 10b of the bottom wall 10a of the gutter 10. In this way, the first member 5 and the second member 6C sandwich the peripheral edge of the inlet 10b of the gutter 10 from both above and below, thereby attaching the drain 1C to the gutter 10.

[0136] [1.4.2 Effects, etc.] The drain 1C described above is a connecting member for connecting a piping member (socket 12) to the inlet 10b of the gutter 10, and comprises a first member 5 having a cylindrical portion 21 positioned at the inlet 10b and a flange 22 extending outward from the upstream end 21a of the cylindrical portion 21, and a second member 6C having a housing portion 65 that houses the cylindrical portion 21 and sandwiches the peripheral edge of the inlet 10b in the gutter 10 between itself and the flange 22, and a connecting cylindrical portion 62 that protrudes from the bottom wall 614 of the housing portion 61 and is connected to the receiving end of the piping member (socket 12). At least a portion of the housing portion 65 has a flow path cross-sectional area 1.1 times or more that of the flow path cross-sectional area of ​​the connecting cylindrical portion 62, and has a length of 10 mm or more in the direction of the central axis C62 of the connecting cylindrical portion 62. At least a portion of the bottom wall 653 of the housing portion 65, between the bottom surface 653a on the side opposite to the connecting cylinder portion 62 and the inner circumferential surface 62a of the connecting cylinder portion 62, has a chamfered portion 63 with a chamfer dimension of 3 mm or more in the cross-section passing through the central axis C62 of the connecting cylinder portion 62. This configuration enables improved drainage capacity.

[0137] In the connecting member (drain 1C), the second member 6C has a connecting portion 654 within the housing portion 65, which has a female threaded portion 654a on its inner circumferential surface that connects to the male threaded portion 21c. This configuration allows the volume of the housing portion 65 to be increased regardless of the size of the cylindrical portion 21.

[0138] [2. Variant] The embodiments of this disclosure are not limited to those described above. The embodiments can be modified in various ways depending on the design, etc., as long as the objectives of this disclosure can be achieved. The following lists some modifications of the embodiments. The modifications described below can be combined and applied as appropriate.

[0139] The gutter drainage structure to which the drain 1 described above can be applied is not limited to the gutter drainage structure 100 shown in Figure 1.

[0140] [2.1 Variation 1] Figure 15 is a schematic diagram of the gutter drainage structure 100D according to modified example 1. The gutter drainage structure 100D comprises a drain 1, a gutter 10, a vertical pipe 11, a horizontal pipe 13, a first elbow 14-1, and a second elbow 14-2.

[0141] In the eaves gutter drainage structure 100D, the vertical pipe 11 is connected to the drain 1 (particularly the second member 6) via the horizontal pipe 13, the first elbow 14-1, and the second elbow 14-2.

[0142] The horizontal pipe 13 defines a flow path that intersects the vertical direction. In a rain gutter system, the horizontal pipe 13 is also called a connecting pipe. The horizontal pipe 13 is the part that carries rainwater from the building 200 from the inlet 10b to the vertical pipe 11. The horizontal pipe 13 is located between the rainwater inlet 10b and the vertical pipe 11. The horizontal pipe 13 is straight. The cross section perpendicular to the central axis of the horizontal pipe 13 is circular. The horizontal pipe 13 is fixed so that the direction of the central axis of the horizontal pipe 13 is inclined with respect to the up and down direction (vertical direction). The horizontal pipe 13 has an upstream end 13a and a downstream end 13b. The upstream end 13a is the end of the horizontal pipe 13 that connects to the inlet 10b (the left end in Figure 15). The downstream end 13b is the end of the horizontal pipe 13 that connects to the vertical pipe 11 (the right end in Figure 15). For example, the material of the horizontal pipe 13 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 13, 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".

[0143] The first elbow 14-1 and the second elbow 14-2 change the direction of the flow path. The first elbow 14-1 and the second elbow 14-2 are connecting fittings that connect flow paths with different directions, such as a vertical pipe and a horizontal pipe.

[0144] Each of the first elbow 14-1 and the second elbow 14-2 has a curved section (bend) 14a and receiving openings 14b and 14c. The curved section 14a and the receiving openings 14b and 14c are formed as a continuous, integral part. As an example, the material of the first elbow 14-1 and the second elbow 14-2 is rigid polyvinyl chloride. The dimensions of the first elbow 14-1 and the second elbow 14-2 may be set in accordance with the JIS K 6739 standard "Rigid polyvinyl chloride pipe fittings for drainage".

[0145] Each of the first elbow 14-1 and the second elbow 14-2 is a 45° elbow (so-called 45L) as specified in JIS K 6739. In each of the first elbow 14-1 and the second elbow 14-2, the angle between the central axes of the sockets 14b and 14c is 45°.

[0146] In the eaves gutter drainage structure 100D, the connecting pipe portion 62 of the second member 6 is connected to the receiving opening 14b of the first elbow 14-1, and the upstream end 13a of the horizontal pipe 13 is connected to the receiving opening 14c of the first elbow 14-1. The downstream end 13b of the horizontal pipe 13 is connected to the receiving opening 14b of the second elbow 14-2, and the upstream end 11a of the vertical pipe 11 is connected to the receiving opening 14c of the second elbow 14-2. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole 310 is formed.

[0147] [2.2 Variation 2] Figure 16 is a schematic diagram of the gutter drainage structure 100E according to modified example 2. The gutter drainage structure 100E comprises a drain 1, a gutter 10, a vertical pipe 11, and an eccentric socket 15.

[0148] In the eaves gutter drainage structure 100E, the vertical pipe 11 is connected to the drain 1 (particularly the second member 6) via the eccentric socket 15.

[0149] The eccentric socket 15 has an eccentric portion 15a and receiving openings 15b and 15c. The eccentric portion 15a and the receiving openings 15b and 15c are formed as a continuous, integral part. As an example, the material of the eccentric socket 15 is rigid polyvinyl chloride. The eccentric socket 15 may be a so-called S-socket.

[0150] In the eaves gutter drainage structure 100E, the connecting pipe portion 62 of the second member 6 is connected to the receiving opening 15b of the eccentric socket 15, and the upstream end 11a of the vertical pipe 11 is connected to the receiving opening 15b of the eccentric socket 15. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole 310 is formed.

[0151] [2.3 Variation 3] Figure 17 is a schematic diagram of the gutter drainage structure 100F according to the modified example 3. The gutter drainage structure 100F comprises a drain 1, gutters 10-1 and 10-2, vertical pipes 11-1 and 11-2, horizontal pipes 13-1 and 13-2, first to third elbows 14-1 to 14-3, a tee 16, a drain 17, and a piping member 18.

[0152] The gutter 10-1 receives rainwater from the roof 210 of the building 200. The gutter 10-1 is installed below the roof 210 of the building 200. The gutter 10-2 receives rainwater from a roof or eaves, etc., below the roof 210 of the building 200. For example, the gutter 10-2 is installed below the gutter 10-1.

[0153] Drain 1 is positioned at the inlet 10b of the gutter 10-1.

[0154] Drain 17 is located at the inlet 10b of the gutter 10-2. Drain 17 does not necessarily have the same configuration as drain 1. Drain 17 may have a well-known configuration.

[0155] The vertical pipe 11-1 is connected to the gutter 10-1 (drain 1 installed in the gutter 10-1) via the horizontal pipe 13-1, the first elbow 14-1, the second elbow 14-2, and the piping member 18. The vertical pipe 11-2 is connected to the gutter 10-2 (drain 17 installed in the gutter 10-2) via the horizontal pipe 13-2, the third elbow 14-3, and the tee 16.

[0156] Horizontal pipe 13-1 is located between the eaves gutter 10-1 and the vertical pipe 11-1. Horizontal pipe 13-2 is located between the eaves gutter 10-2 and the vertical pipe 11-2. Here, the length of horizontal pipe 13-1 is 2m or less, preferably 1m or less.

[0157] The first elbow 14-1 connects the gutter 10-1 to the upstream end 13a of the horizontal pipe 13-1. The second elbow 14-2 connects the downstream end 13b of the horizontal pipe 13-1 to the upstream end 11a of the vertical pipe 11-1. The third elbow 14-3 connects the gutter 10-2 to the upstream end 13a of the horizontal pipe 13-2.

[0158] In this modified example, the first elbow 14-1 is a 90° large-bend elbow (so-called LL) as defined in JIS K 6739. The second elbow 14-2 and the third elbow 14-3 are 90° elbows (so-called DL) as defined in JIS K 6739.

[0159] The cheese (Tee) 16 has an upward-facing first receiving port 16a, a downward-facing second receiving port 16b, and a laterally-facing third receiving port 16c. The cheese 16 combines the fluid flowing in from the first receiving port 16a with the fluid flowing in from the third receiving port 16c, and discharges it from the second receiving port 16b. The angle between the central axis of the first receiving port 16a and the central axis of the third receiving port 16c is 90° or less. As an example, the angle between the central axis of the first receiving port 16a and the central axis of the third receiving port 16c is set to 88.83°. As an example, the material of the cheese 16 is rigid polyvinyl chloride.

[0160] The first socket 16a is connected to the downstream end 11b of the vertical pipe 11-1. The second socket 16b is connected to the upstream end 11a of the vertical pipe 11-2. The third socket 16c is connected to the downstream end 13b of the horizontal pipe 13-2.

[0161] In the eaves gutter drainage structure 100F, a first elbow 14-1 and a second elbow 14-2 are provided between the eaves gutter 10-1 and the vertical pipe 11-1. The direction of the flow path changes in each of the first elbow 14-1 and the second elbow 14-2. When the direction of the flow path changes, pressure loss due to separation can be one of the causes of a decrease in flow rate. In this modified example, the radius of curvature of the second elbow 14-2 is smaller than the radius of curvature of the first elbow 14-1. Therefore, the pressure loss caused by the second elbow 14-2 tends to be greater than the pressure loss caused by the first elbow 14-1. To reduce the decrease in flow rate due to the pressure loss caused by the second elbow 14-2, a piping member 18 is provided.

[0162] The piping member 18 is positioned between the second elbow 14-2 and the vertical pipe 11-1. The piping member 18 comprises a straight pipe section 18a and a projection member 18b.

[0163] The straight pipe section 18a is straight and has a socket 181 at its downstream end. The socket 181 is provided to connect the upstream end 11a of the vertical pipe 11-1 to the straight pipe section 18a. The upstream end of the straight pipe section 18a is connected to the socket 14c of the second elbow 14-2.

[0164] The projection member 18b is located downstream of the second elbow 14-2. More specifically, the projection member 18b is located on the inner circumference of the second elbow 14-2 within the straight pipe section 18a downstream of the second elbow 14-2 and is used to partially reduce the flow path cross-sectional area.

[0165] The surface of the projection member 18b is a curved shape that protrudes from the inner circumference to the outer circumference of the second elbow 14-2. The height of the projection member 18b varies along the direction of the central axis of the vertical pipe 11-1. The projection member 18b has a apex where its height is greatest, located between the upstream end and the downstream end. The height of the projection member 18b increases monotonically from the upstream end towards the apex. The height of the projection member 18b decreases monotonically from the apex towards the downstream end. At the apex, the projection member 18b minimizes the flow path cross-sectional area of ​​the vertical pipe 11-1.

[0166] Thus, by providing the projection member 18b, a reduced portion exists downstream of the second elbow 14-2 where the flow path cross-sectional area is smaller than that of the vertical pipe 11-1. The presence of such a projection member 18b is expected to (1) make it easier for the fluid to flow along the pipe wall than in the absence of the projection member 18b, and (2) reduce the number of areas where pressure loss may occur. Therefore, the projection member 18b can reduce the occurrence of pressure loss due to separation downstream of the second elbow 14-2 and improve the flow rate.

[0167] In the eaves gutter drainage structure 100F, rainwater from the eaves gutter 10-1 flows into the tee 16 through the first elbow 14-1, horizontal pipe 13-1, second elbow 14-2, piping member 18, and vertical pipe 11-1. Similarly, rainwater from the eaves gutter 10-2 flows into the tee 16 through the third elbow 14-3 and horizontal pipe 13-2. The rainwater from the eaves gutter 10-1 and the rainwater from the eaves gutter 10-2 then merge at the tee 16 and are discharged into the manhole 310 through the vertical pipe 11-2.

[0168] [2.4 Modification 4] Figure 18 is a plan view of the second member 6G of the drain according to the modified example 4. The second member 6G has a housing portion 65 and a connecting cylinder portion 62, similar to the second member 6C, but the position of the connecting cylinder portion 62 relative to the housing portion 65 is different. In the second member 6G, the central axis C62 of the connecting cylinder portion 62 does not coincide with the central axis C651 of the cylinder portion 651. In the second member 6G, a part of the inner circumferential surface of the connecting cylinder portion 62 is located on the same plane as the inner circumferential surface of the cylinder portion 651. Therefore, although the chamfered portion 63 is not provided around the entire circumference of the connecting cylinder portion 62, the circumference of the chamfered portion 63 is 0.5 times or more the circumference of the connecting cylinder portion 62, which makes it possible to improve the drainage capacity.

[0169] [2.5 Other variations] In one modified example, the reduced diameter portion 64 does not necessarily have to extend from the downstream end 611b of the cylindrical portion 611, and if the housing portion 61 has a bottom wall 614, it may extend from the opening edge of the bottom wall 614.

[0170] In one modified example, the drain pipe portion 2, the funnel portion 3, and the blade 4 may be formed by injection molding of a resin such as rigid polyvinyl chloride resin, polycarbonate, or ABS, or they may be made of a metal such as cast iron. The drain pipe portion 2, the funnel portion 3, and the blade 4 may be formed as a single continuous part, or they may be formed as separate parts.

[0171] In one modified example, the drain pipe portion 2 does not necessarily have to have a connecting portion 23. The second member 6 does not necessarily have to have a connecting portion 613.

[0172] In one modified example, the first member 5 does not necessarily have to include the funnel portion 3. Similarly, the drain 1 does not necessarily have to include the vanes 4.

[0173] In one modified example, when viewed from the direction of the central axis C3 of the funnel portion 3, the outer shape of the funnel portion 3, for example, the reduced diameter portion 31, the small diameter cylindrical portion 32, or the outer shape of the flange 33, is not limited to a circular shape, but may be elliptical, polygonal, or other shapes.

[0174] In one modified example, the first member 5 does not have to be equipped with a funnel portion 3 as a connecting portion. The connecting portion may be a lid portion. The lid portion may be plate-shaped. The lid portion may be circular when viewed from the direction of the central axis of the lid portion. However, the outer shape of the lid portion is not limited to a circular shape, and may be elliptical, polygonal, or other shapes. The thickness of the lid portion may be uniform. It is preferable that the lid portion does not have a hole passing through it in order to function as a lid for the drain opening 2c.

[0175] In one modified example, the funnel portion 3 may not have to have either or both of the small-diameter cylindrical portion 32 and the flange 33.

[0176] In one modified example, the number of blades 4 is not particularly limited. The number of blades 4 may be one or more. The blades 4 may be located between the funnel portion 3 and the connecting portion 23 or flange 22, as long as they do not come into contact with the surface of the funnel portion 3 on the cylindrical portion 21 side (second surfaces 312, 332).

[0177] In one modified example, the arm portion 42 of the blade 4 does not necessarily have to extend to the reduced diameter portion 31. In other words, the arm portion 42 does not have to have a second portion 42b. The height of the second portion 42b relative to the drain pipe portion 2 does not have to decrease as it approaches the center of the reduced diameter portion 31.

[0178] In one modified example, the arm portion 42 of the blade 4 does not necessarily have to be connected to the flange 33, but may be connected only to the reduced diameter portion 31. In other words, the arm portion 42 may be connected to the reduced diameter portion 31 without being connected to the flange 33. In this case, there may be a gap between the first surface 331 of the flange 33 and the arm portion 42 in the direction of the central axis C2 of the drain pipe portion 2.

[0179] In one modified example, the first end portion 41a of the main body portion 41 does not have to be inclined to move away from the funnel portion 3 as it approaches the drain pipe portion 2. Therefore, the first end portion 41a may extend along the central axis C2 of the drain pipe portion 2.

[0180] In one modified example, the gap G may be provided by shortening the length of the main body portion 41 of the blade 4 in the radial direction of the drain pipe portion 2, or by forming a notch in the main body portion 41 on the funnel portion 3 side. In short, the gap G should be provided such that the flange 33 of the funnel portion 3 and the main body portion 41 of the blade 4 are spaced apart from each other in the radial direction of the drain pipe portion 2.

[0181] [3. Appearance] As will be apparent from the above embodiments and modifications, this disclosure includes the following aspects.

[0182] [Aspect 1] A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet and a flange extending outward from the upstream end of the cylindrical portion, A second member having a housing portion that accommodates the cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the flange, and a connecting cylindrical portion that protrudes from the bottom wall of the housing portion and is connected to the receiving end of the piping member, Equipped with, At least a portion of the housing portion has a flow path cross-sectional area 1.1 times or more than the flow path cross-sectional area of ​​the connecting cylinder portion, and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder portion. At least a portion of the bottom wall of the housing portion opposite to the connecting cylinder portion and the inner circumferential surface of the connecting cylinder portion has a fillet portion with a representative radius of curvature of 2 mm or more in the cross-section passing through the central axis of the connecting cylinder portion, or a chamfered portion with a chamfer dimension of 3 mm or more in the cross-section passing through the central axis of the connecting cylinder portion. Connecting component.

[0183] [Aspect 2] A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet and a flange extending outward from the upstream end of the cylindrical portion, A second member comprising a housing portion that accommodates the cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the flange, a connecting cylindrical portion connected to the receiving end of the piping member, and a reduced diameter portion located between the housing portion and the connecting cylindrical portion, the inner diameter of which gradually decreases as it moves from the housing portion toward the connecting cylindrical portion, Equipped with, At least a portion of the reduced diameter portion has a flow path cross-sectional area 1.1 times or more than the flow path cross-sectional area of ​​the connecting cylinder portion, and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder portion. Connecting component.

[0184] [Aspect 3] At least a portion of the housing is cylindrical, and is at least one size larger than the connecting cylinder portion. A connecting member according to embodiment 1 or 2.

[0185] [Aspect 4] The first member has a male threaded portion on the outer circumferential surface of the cylindrical portion, The second member has a female screw portion located within the housing portion that is connected to the male screw portion. A connecting member from any one of the embodiments 1 to 3.

[0186] [Aspect 5] The inner diameter of the connecting cylinder portion is smaller than the minimum value of the inner diameter of the first member. A connecting member from any one of the embodiments 1 to 4.

[0187] [Aspect 6] The drain pipe section having the cylindrical portion and the flange, Five or more blades protruding from the upstream end of the drain pipe in the direction of the central axis of the drain pipe, A connecting part that connects the five or more blades, Equipped with, A connecting member from any one of the embodiments 1 to 5.

[0188] [Aspect 7] When viewed from the direction of the central axis of the connecting cylinder, the circumferential length of the fillet portion or the chamfered portion is 0.5 times or more the circumferential length of the connecting cylinder. A connecting member of embodiment 1.

[0189] The second through seventh aspects are not mandatory. [Industrial applicability]

[0190] This disclosure is applicable to connecting members. Specifically, this disclosure is applicable to connecting members for connecting piping members to the inlet of a gutter. [Explanation of symbols]

[0191] 1, 1A, 1B, 1C Drain 2 Drain pipe part 2a Upstream end 21 Cylinder part 21a Upstream end 21c male thread part 22 Flange 3 Funnel part (connection part) 4 feathers 5. First Member 6, 6A, 6B, 6C, 6G Second member 61, 61B Enclosure 611c Female thread section 614, 653 Bottom wall 614a, 653a Bottom 62 Connecting cylinder section 62a Inner surface 63 Chamfered section 63A Fillet section 64 Reduced diameter part 65 Housing section 10 Gutters 10b Inlet 12 Sockets (Piping Components)

Claims

1. A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet and a flange extending outward from the upstream end of the cylindrical portion, A second member having a housing portion that accommodates the cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the flange, and a connecting cylindrical portion that protrudes from the bottom wall of the housing portion and is connected to the receiving end of the piping member, Equipped with, At least a portion of the housing portion has a flow path cross-sectional area 1.1 times or more than the flow path cross-sectional area of ​​the connecting cylinder portion, and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder portion. In a cross-section passing through the central axis of the connecting cylinder portion, at least a portion between the bottom surface of the housing portion's bottom wall opposite to the connecting cylinder portion and the inner circumferential surface of the connecting cylinder portion has a fillet portion with a representative radius of curvature of 2 mm or more in the cross-section passing through the central axis of the connecting cylinder portion, or a chamfered portion with a chamfer dimension of 3 mm or more in the cross-section passing through the central axis of the connecting cylinder portion. Connecting component.

2. A connecting member for connecting a piping member to the inlet of a gutter, A first member having a cylindrical portion positioned at the inlet and a flange extending outward from the upstream end of the cylindrical portion, A second member having a housing portion that houses the cylindrical portion and sandwiches the peripheral edge of the inlet of the gutter between itself and the flange, a connecting cylindrical portion that is connected to the receiving end of the piping member, and a reduced diameter portion between the housing portion and the connecting cylindrical portion, the inner diameter of which gradually decreases as it moves from the housing portion toward the connecting cylindrical portion, Equipped with, At least a portion of the reduced diameter portion has a flow path cross-sectional area 1.1 times or more than the flow path cross-sectional area of ​​the connecting cylinder portion, and has a length of 10 mm or more in the direction of the central axis of the connecting cylinder portion. Connecting component.

3. At least a portion of the housing is cylindrical, and is at least one size larger than the connecting cylinder portion. A connecting member according to claim 1 or 2.

4. The first member has a male threaded portion on the outer circumferential surface of the cylindrical portion, The second member has a female screw portion located within the housing portion that is connected to the male screw portion. A connecting member according to claim 1 or 2.

5. The inner diameter of the connecting cylinder portion is smaller than the minimum value of the inner diameter of the first member. A connecting member according to claim 1 or 2.

6. The drain pipe section having the cylindrical portion and the flange, Five or more blades protruding from the upstream end of the drain pipe in the direction of the central axis of the drain pipe, A connecting part that connects the five or more blades, Equipped with, A connecting member according to claim 1 or 2.

7. When viewed from the direction of the central axis of the connecting cylinder, the circumferential length of the fillet portion or the chamfered portion is 0.5 times or more the circumferential length of the connecting cylinder. The connecting member according to claim 1.

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