Drain

Abstract

To provide a drain capable of improving a drainage function while removing a foreign material.SOLUTION: A drain 1 comprises: a drain cylinder part 2 that has an upstream side end 2a and a downstream side end 2b, a cylinder part 21, and an annular flange 22 extending from the side of the upstream side end of the cylinder part 21 to the outside in a radial direction of the cylinder part 21; a shield part 3 that is disposed on the upstream side end 2a of the drain cylinder part 2 and forms an inflow port E between the shield part and the flange 22; and one or more blades 4 protruding from the upstream side end 2a of the drain cylinder part 2. At least a portion of one or more blades 4 is not overlapped with the shield part 3 when viewed from a direction of a central axis C2 of the drain cylinder part 2. The drain satisfies D≤Da and (D-Da) / 2<L<(Df-Da)×0.75, where an inner diameter of the cylinder part 21 is D, an outer diameter of the flange 22 is Df, a diameter representing outer shape of the shield part 3 viewed from the direction of the central axis C2 of the drain cylinder part 2 is Da, and a minimum length in the radial direction of the drain cylinder part 2 of the one or more blades 4 is L.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a drain. [Background technology]

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

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

[0004] In the drainage member disclosed in Patent Document 1, the opening on the outer periphery formed between the cover member and the vertical ribs may become blocked by foreign matter such as fallen leaves carried by rainwater flowing through the eaves gutter, thereby reducing the drainage function.

[0005] The present disclosure provides a drain that allows for improved drainage while still allowing for the removal of foreign matter. [Means for solving the problem]

[0006] The drain according to one aspect of the present disclosure has an upstream end and a downstream end, and includes a drain tube portion having a cylindrical portion and an annular flange extending radially outward from the upstream end side of the cylindrical portion, a shielding portion disposed at the upstream end of the drain tube portion and forming an inlet between the shielding portion and the flange, and one or more vanes protruding from the upstream end of the drain tube portion. When viewing from the direction of the central axis of the drain tube portion, at least a part of the one or more vanes does not overlap with the shielding portion. Let the inner diameter of the cylindrical portion be D, the outer diameter of the flange be Df, the diameter representing the outer shape of the shielding portion when viewed from the direction of the central axis of the drain tube portion be Da, and the minimum length in the radial direction of the drain tube portion of the one or more vanes be L. Then, D≦Da and (D−Da) / 2 < L < (Df−Da)×0.75 are satisfied.

Advantages of the Invention

[0007] The aspect of the present disclosure enables improvement of the drainage function while enabling removal of foreign matters.

Brief Description of the Drawings

[0008] [Figure 1] Schematic diagram of a eaves gutter drainage structure including the drain according to Embodiment 1 [Diagram 2] Cross-sectional view of a eaves gutter drainage structure including the drain according to Embodiment 1 [Diagram 3] Perspective view of the drain according to Embodiment 1 [Figure 4] Plan view of the drain according to Embodiment 1 [Diagram 5] Bottom view of the drain according to Embodiment 1 [Figure 6] Cross-sectional view of a eaves gutter drainage structure including the drain according to Embodiment 2 [Figure 7] Schematic diagram of a eaves gutter drainage structure according to Modification 1 [Figure 8] Schematic diagram of a eaves gutter drainage structure according to Modification 2 [Figure 9] Schematic diagram of a eaves gutter drainage structure according to Modification 3

Modes for Carrying Out the Invention

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

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

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

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

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

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

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

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

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

[0018] The drain 1 includes a drain tube portion 2, a shielding portion 3, and one or more blades 4. In this embodiment, the drain 1 includes five blades 4.

[0019] As shown in Fig. 2, the drain tube portion 2 has an upstream end 2a and a downstream end 2b. The drain tube portion 2 further has a drop opening 2c. The drop opening 2c is an internal space between the upstream end 2a and the downstream end 2b of the drain tube portion 2.

[0020] As shown in Figures 2 and 3, the drain tube portion 2 includes a tube portion 21 and a flange 22. The tube portion 21 is cylindrical with an inner diameter and an outer diameter that do not change. A male thread 21a is formed on the outer circumferential surface of the tube portion 21. The flange 22 is located at the upstream end of the tube portion 21 and extends radially outward from the tube portion 21. The flange 22 is annular.

[0021] An inner diameter D (see FIG. 2) of the cylindrical portion 21 may be set appropriately according to the dimensions of the pipe connected to the drain 1. The dimensions of the pipe, for example, the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "rigid polyvinyl chloride pipes."

[0022] Table 1 shows an example of the nominal diameter of VP rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipe". In Table 1, the units of the outer diameter (standard dimension), thickness (minimum dimension) and approximate inner diameter are mm.

[0023] [Table 1]

[0024] Table 2 shows an example of the nominal diameter of VU rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipes". In Table 2, the units of the outer diameter (standard dimension), thickness (minimum dimension) and approximate inner diameter are mm.

[0025] [Table 2]

[0026] The inner diameter D of the tubular portion 21 may be set based on an approximate inner diameter corresponding to the nominal diameter of the pipe. In this embodiment, the inner diameter D of the tubular portion 21 may be set to satisfy 40 mm≦D≦150 mm. For example, the inner diameter D of the tubular portion 21 may be set to correspond to any one of the nominal diameters of 75 mm, 100 mm, and 125 mm.

[0027] As can be seen from FIGS. 4 and 5, the central axis C2 of the drainage tubular portion 2 coincides with the central axis C21 of the tubular portion 21 and the central axis C22 of the flange 22.

[0028] In the drain tubular portion 2, the flange 22 defines an upstream end 2a, and the downstream end of the tubular portion 21 defines a downstream end 2b.

[0029] In this embodiment, there is a connection portion 23 between the upstream end of the tubular portion 21 and the flange 22. The connection portion 23 is cylindrical with an inner diameter that gradually increases from the tubular portion 21 toward the flange 22. Therefore, in a cross section passing through the central axis C2 of the drainage tubular portion 2, the inner peripheral surface of the connection portion 23 is a smooth arc-shaped curved surface.

[0030] 2 and 3, the shielding part 3 is located at the upstream end 2a of the drain tube part 2. More specifically, the shielding part 3 is disposed at the upstream end 2a of the drain tube part 2, and forms an inlet E between the shielding part 3 and the flange 22. In this embodiment, the shielding part 3 is disposed opposite the upstream end 2a of the drain tube part 2, with the central axis C3 of the shielding part 3 coinciding with the central axis C2 of the drain tube part 2.

[0031] 2 and 7, the shielding part 3 has a first opening 3a and a second opening 3b. When viewed from the direction of the central axis C2 of the drain tube part 2, the first opening 3a and the second opening 3b are located inside the tube part 21. Therefore, the shielding part 3 directs the fluid that has flowed in from the first opening 3a through the second opening 3b to the drop outlet 2c of the drain tube part 2. On the other hand, the shielding part 3 can reduce the possibility of foreign matter entering the drop outlet 2c of the drain tube part 2.

[0032] The shielding portion 3 is funnel-shaped. More specifically, the shielding portion 3 has a reduced diameter portion 31, a small diameter cylindrical portion 32, and a flange 33.

[0033] The reduced diameter portion 31 is cylindrical in shape with an outer diameter and an inner diameter that decrease toward the drain tube portion 2. The reduced diameter portion 31 can also be said to be a hollow truncated cone with both ends open. 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 the drain tube 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 on the drain tube portion 2 side. In this embodiment, the maximum value of the outer diameter of the reduced diameter portion 31 is smaller than the inner diameter of the drain tube portion 2 (the inner diameter of the tube 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.

[0034] The small diameter tubular portion 32 extends from the end of the reduced diameter portion 31 on the drain tube portion 2 side (the lower end in Figure 2) toward the drain tube portion 2. The small diameter tubular portion 32 is cylindrical with less change in inner and outer diameter than the reduced diameter portion 31. The inside of the small diameter tubular portion 32 is connected to the inside of the reduced diameter portion 31. The outer and inner peripheral surfaces of the small diameter tubular portion 32 are approximately perpendicular to the central axis of the drain tube portion 2, and therefore are neither the surface on the drain tube portion 2 side nor the surface opposite to the drain tube portion 2.

[0035] The flange 33 extends from the end of the reduced diameter portion 31 opposite the drain tube portion 2 (the upper end in FIG. 2) toward the outside in the radial direction of the drain tube portion 2. 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 the drain tube 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 on the drain tube portion 2 side. The inlet E is formed between the second surface 332 of the flange 33 of the shielding portion 3 and the upstream end 2a of the drain tube portion 2. The flange 33 is annular. In this embodiment, the outer diameter of the flange 33 is larger than the inner diameter of the drain tube portion 2 (the inner diameter of the tube portion 21).

[0036] As can be seen from Figures 4 and 5, in the shielding portion 3, the opening at the end of the reduced diameter portion 31 opposite the drain tube portion 2 is the first opening 3a, and the opening at the end of the small diameter tube portion 32 on the drain tube portion 2 side is the second opening 3b.

[0037] As can be seen from FIG. 2, in this embodiment, the shielding portion 3 is not inserted in the drain tube portion 2. Here, in the direction of the central axis C2 of the drain tube portion 2, the distance between the second opening 3b and the drain tube portion 2 may be less than 1 / 2 the distance between the first opening 3a and the drain tube portion 2. In this embodiment, the end portion (second opening 3b) of the small diameter tube portion 32 of the shielding portion 3 on the drain tube portion 2 side and the upstream end portion 2a of the drain tube portion 2 are on the same plane. In other words, the minimum distance between the shielding portion 3 and the drain tube portion 2, i.e., the distance between the second opening 3b and the drain tube portion 2, is 0.

[0038] As can be seen from FIGS. 4 and 5, the central axis C3 of the shielding 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.

[0039] In the shielding portion 3, the first surface 311 of the reduced diameter portion 31 and the first surface 331 of the flange 33 form the surface of the shielding portion 3 opposite the drainage tube portion 2. In the shielding portion 3, the second surface 312 of the reduced diameter portion 31 and the second surface 332 of the flange 33 form the surface of the shielding portion 3 facing the drainage tube portion 2. In addition, the outer peripheral portion 33a of the flange 33 forms the outer peripheral portion of the shielding portion 3 when viewed from the direction of the central axis C2 of the drainage tube portion 2.

[0040] As shown in Figures 3 to 5, in this embodiment, the number of blades 4 is five. The five blades 4 have the same shape. As shown in Figure 4, when viewed from the direction of the central axis C2 of the drainage tube portion 2, the five blades 4 are arranged at equal intervals around the central axis C2 of the drainage tube portion 2.

[0041] The blades 4 protrude from the upstream end 2a of the drain tube portion 2. The blades 4 may be used to regulate the flow of fluid flowing from the eaves gutter 10 into the drain 1. In this embodiment, the blades 4 are also used to connect the drain tube portion 2 and the shielding portion 3. More specifically, the blades 4 connect the upstream end 2a of the drain tube portion 2 to the surface of the shielding portion 3 opposite the drain tube portion 2.

[0042] The blade 4 includes a main body portion 41 , an arm portion 42 , and a reinforcing portion 43 .

[0043] The main body 41 is plate-shaped. In particular, the main body 41 is rectangular plate-shaped. The main body 41 protrudes from the upstream end 2a of the drain tube portion 2. In particular, the main body 41 protrudes from the upstream end 2a of the drain tube portion 2 along the central axis C2 of the drain tube portion 2. The direction of the central axis C2 of the drain tube portion 2 corresponds to the height direction of the main body 41. The main body 41 extends in the radial direction of the drain tube portion 2 when viewed from the direction of the central axis C2 of the drain tube portion 2. The radial direction of the drain tube portion 2 corresponds to the length direction of the main body 41. The width direction (thickness direction) of the main body 41 is perpendicular to the radial direction of the drain tube portion 2 when viewed from the direction of the central axis C2 of the drain tube portion 2. As an example, the width of the main body 41 is preferably 2 mm or more and 6 mm or less.

[0044] 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.

[0045] The first end 41a and the second end 41b are both ends in the longitudinal direction of the main body 41. In particular, the first end 41a is the end on the central axis C2 side of the drain tube portion 2 when viewed from the direction of the central axis C2 of the drain tube portion 2. The second end 41b is the end on the opposite side to the central axis C2 of the drain tube portion 2 when viewed from the direction of the central axis C2 of the drain tube portion 2.

[0046] As can be seen from FIG. 2 and FIG. 5, the corners of the first end 41a of the main body 41 are fillet-shaped when viewed from the direction of the central axis C2 of the drain tube 2. In particular, the corners of the first end 41a of the main body 41 are convex fillet-shaped. This makes it difficult for a worker to hurt his / her hands when touching the corners of the first end 41a when holding the blades 4 during construction of the drain 1. This makes it easier for a worker to hold the blades 4 during construction of the drain 1. The corners 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 tube 2.

[0047] In this embodiment, when viewed from the direction of the central axis C2 of the drain tube portion 2, one or more of the blades 4 do not entirely overlap with the shielding portion 3. This allows the space between the drain tube portion 2, the shielding portion 3, and the blades 4 to be expanded. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. Meanwhile, when viewed from the direction of the central axis C2 of the drain tube portion 2, the first end portion 41a of the main body portion 41 is within the drop outlet 2c of the drain tube portion 2. This makes it possible to improve the straightening effect of the blades 4.

[0048] As shown in FIG. 2, the first end 41a of the main body 41 extends along the central axis C2 of the drain tube portion 2.

[0049] As can be seen from Figures 3 and 4, the corners of the second end 41b of the main body 41 (both corners in this embodiment) are fillet-shaped when viewed from the direction of the central axis C2 of the drain tube 2. In particular, the corners of the second end 41b of the main body 41 are convex fillet-shaped. This makes it difficult for a worker to hurt his / her hands when touching the corners of the second end 41b when holding the blades 4 during construction of the drain 1. This makes it easier for a worker to hold the blades 4 during construction of the drain 1. The corners of the second end 41b of the main body 41 may be tapered when viewed from the direction of the central axis C2 of the drain tube 2.

[0050] The third end 41c and the fourth end 41d are both ends in the height direction of the main body 41. In particular, the third end 41c is the end on the opposite side to the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2. The fourth end 41d is the end on the drain tube portion 2 side in the direction of the central axis C2 of the drain tube portion 2.

[0051] The fourth end 41d is also the part of the main body 41 that is connected to the drain tube portion 2.

[0052] In the direction of the central axis C2 of the drain tube portion 2, the main body portion 41 is connected to the flange 22 and the connection portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. In other words, when viewed from the direction of the central axis C2 of the drain tube portion 2, the main body portion 41 does not protrude into the drop outlet 2c of the drain tube portion 2. This allows the space between the drain tube portion 2, the shielding portion 3, and the blades 4 to be expanded. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. Furthermore, since the main body portion 41 extends not only to the flange 22 of the drain tube portion 2 but also to the connection portion 23, the strength of the blades 4 can be maintained.

[0053] In this embodiment, as shown in FIG. 4, the main body 41 has fillets 41e, 41e at the end (fourth end 41d) on the drain tube 2 side, which increase the width of the main body 41 in the direction of the central axis C2 of the drain tube 2. In this embodiment, the fillets 41e, 41e are on both sides of the width of the main body 41. The surface of the fillet 41e is concave. The fillet 41e enables the strength of the blade 4 against the drain tube 2 to be improved. In this embodiment, as shown in FIG. 4, the fillet 41e extends along the main body 41, and extends to the connection part 23 as well as the flange 22 of the drain tube 2, similar to the main body 41. At least one of the radius of curvature or the width of the fillet 41e becomes smaller from the second end 41b to the first end 41a of the main body 41. This enables the drainage function to be improved by the fillet 41e. At the end of the fillet 41e towards the first end 41a, the radius of curvature or width of the fillet 41e may decrease to zero.

[0054] The arm portion 42 connects the surface (first surfaces 311, 331) of the shielding portion 3 opposite the drain tube portion 2 to the main body portion 41. The arm portion 42 protrudes from the end portion (third end portion 41c) of the main body portion 41 opposite the drain tube portion 2 toward the shielding portion 3. When viewed from the direction of the central axis C2 of the drain tube portion 2, the arm portion 42 extends in the radial direction of the drain tube portion 2. When viewed from the direction of the central axis C2 of the drain tube portion 2, the width direction of the arm portion 42 is perpendicular to the radial direction of the drain tube portion 2. As an example, the width of the arm portion 42 is preferably 2 mm or more and 6 mm or less.

[0055] 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 of the shielding portion 3 and the first surface 311 of the reduced diameter portion 31. 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 a portion of the arm portion 42 that is connected to the flange 33. The second portion 42b is a portion 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 tube 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 tube portion 2 decreases as it approaches the center of the reduced diameter portion 31. The height of the first portion 42a or the second portion 42b relative to the drain tube portion 2 is the distance between the drain tube portion 2 and the end of the first portion 42a or the second portion 42b opposite the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2. This can increase the inflow of rainwater into the shielding portion 3. Furthermore, even if rainwater flows into the shielding portion 3, the possibility of vortexes occurring in the drain tube portion 2 can be reduced.

[0056] In this embodiment, as shown in FIG. 4, the arm 42 has fillets 42c, 42c at the end (lower end) on the drain tube 2 side, which increase the width of the arm 42 in the direction of the central axis C2 of the drain tube 2. In this embodiment, the fillets 42c, 42c are on both sides of the arm 42 in the width direction. The surface of the fillet 42c is concave. The fillet 42c enables the strength of the connection between the shielding part 3 and the blade 4 to be improved. In this embodiment, as shown in FIG. 4, the fillet 42c extends along the arm 42, and extends to the reduced diameter part 31 as well as the flange 33 of the shielding part 3, similar to the arm 42. In particular, at the tip of the fillet 42c, at least one of the radius of curvature or the width of the fillet 42c becomes smaller as it approaches the central axis C2 of the shielding part 3. This enables the drainage function by the fillet 42c to be improved. At the tip of the fillet 42c, the radius of curvature or width of the fillet 42c may decrease to zero.

[0057] The reinforcing portion 43 is provided to improve the strength of the blade 4. As shown in FIG. 4, the reinforcing portion 43 is located at a position overlapping with the outer periphery of the shielding portion 3 (the outer periphery 33a of the flange 33) when viewed from the direction of the central axis C2 of the drainage tube portion 2. The width direction of the reinforcing portion 43 is perpendicular to the radial direction of the drainage tube portion 2 when viewed from the direction of the central axis C2 of the drainage tube portion 2. The width of the reinforcing portion 43 increases as it approaches the shielding portion 3 (the flange 33) in the direction of the central axis C2 of the drainage tube portion 2. When a force is applied to the shielding portion 3 or the blade 4, stress tends to concentrate on the portion of the blade 4 corresponding to the outer periphery of the shielding portion 3. Therefore, the presence of the reinforcing portion 43 can reduce the possibility of the blade 4 being damaged by such stress. The maximum width of the reinforcing portion 43 is preferably in the range of 1.1 to 1.4 times the width of the main body portion 41.

[0058] 2 and 3, in this embodiment, in the direction of the central axis C2 of the drain tube portion 2, the surface 43a of the reinforcement portion 43 on the drain tube portion 2 side is farther from the drain tube portion 2 than the surface (second surface 332 of the flange 33) on the drain tube portion 2 side at the outer periphery of the shielding portion 3. In FIG. 2, the position of the surface 43a on the drain tube portion 2 side of the reinforcement portion 43 is indicated by h1, and the position of the surface (second surface 332 of the flange 33) on the drain tube portion 2 side at the outer periphery of the shielding portion 3 is indicated by h2. This makes it easier for the reinforcement portion 43 to absorb stress when force is applied to the shielding portion 3 or the blades 4, reducing the possibility of damage to the blades 4.

[0059] In this 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 tube portion 2. When a force is applied to the shielding portion 3 or the blade 4, stress is likely to concentrate at the connection portion between the main body portion 41 and the arm portion 42 in the blade 4. Therefore, the presence of the reinforcing portion 43 can reduce the possibility of the blade 4 being damaged by such stress.

[0060] In this embodiment, the reinforcing portion 43 is located at a position overlapping with the outer periphery of the shielding portion 3 (the outer periphery 33a of the flange 33) when viewed from the direction of the central axis C2 of the drainage tube portion 2. In addition, in the direction of the central axis C2 of the drainage tube portion 2, the surface 43a of the reinforcing portion 43 on the drainage tube portion 2 side is farther from the drainage tube portion 2 than the surface on the drainage tube portion 2 side of the outer periphery of the shielding portion 3 (the second surface 332 of the flange 33). As a result, as shown in FIG. 2, in the radial direction of the inscribed circle of the shielding portion 3, there is a gap G between the main body portion 41 and the end portion on the drainage tube portion 2 side of the outer periphery of the shielding portion 3. Due to the gap G, the blade 4 is not in contact with the outer end of the drainage tube portion 2 on the second surface 332 of the flange 33 in the radial direction. Due to such a gap G, the main body portion 41 of the blade 4 and the flange 33 of the shielding portion 3 are separated from each other in the radial direction of the drainage tube portion 2. Therefore, the space between the drain tube section 2, the shielding section 3, and the blades 4 can be expanded, making it possible to further suppress deterioration of the drainage function caused by foreign matter. In particular, the presence of the gap G makes it easier for a swirling flow to occur between the reduced diameter section 31 and the blades 4, which is expected to improve the drainage function.

[0061] In this embodiment, as shown in FIG. 2, the blade 4 does not contact the surface (second surface 312, 332) of the shielding part 3 facing the drain tube part 2. Therefore, the space between the shielding part 3 and the drain tube part 2 can be expanded, and the possibility of a foreign object being caught can be reduced. Therefore, the drain 1 can improve the straightening effect and suppress the deterioration of the drainage function caused by the foreign object. In particular, in this embodiment, the blade 4 is not located between the shielding part 3 and the drain tube part 2. Therefore, the space between the shielding part 3 and the drain tube part 2 can be further expanded, and the possibility of a foreign object being caught can be further reduced. Therefore, the drain 1 can further suppress the deterioration of the drainage function caused by the foreign object.

[0062] Here, when draining water using the siphon phenomenon, the drain 1 is considered to play an important role. The role required of the drain 1 is often to contribute to stabilizing the occurrence of the siphon phenomenon and to reduce the inlet loss at the inlet 10b of the eaves gutter 10. Regarding the stabilization of the occurrence of the siphon phenomenon, when an elbow with a small curvature radius such as a so-called DL elbow is connected downstream of the drain 1, it is required to make it easier to cause the phenomenon of blocking the pipe with water (hydraulic jump phenomenon), which is thought to contribute to the occurrence of the siphon phenomenon. Regarding the reduction of the inlet loss at the inlet 10b of the eaves gutter 10, when the pipe is close to being full of water, further improvement in the reduction of the loss at the time of inflow from the drain 1 is required. When the inventors considered further improvement in the reduction of the loss at the time of inflow from the drain 1, they found that the vane 4 for removing foreign matter or rectifying the flow of water flowing from the eaves gutter 10 is a factor that hinders the reduction of the loss. The inventors have discovered that by adjusting the dimensions and positional relationship of the drain tube section 2, shielding section 3, and blades 4 of the drain 1 as described below, it is possible to further reduce losses during inflow from the drain 1 even when the blades 4 are present.

[0063] The dimensions and positional relationship of the drain tube portion 2, the shielding portion 3, and the blades 4 of the drain 1 will be described below with reference to FIG.

[0064] In the drain 1, let the inner diameter of the cylindrical portion 21 be D, the outer diameter of the flange 22 be Df, the diameter representing the outer shape of the shielding portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2 be Da, and the minimum length in the radial direction of the drain pipe portion 2 of the blade 4 be L. The drain 1 satisfies D ≤ Da and (D - Da) / 2 < L < (Df - Da)×0.75. In this case, it is confirmed that the inlet loss at the inlet E due to the blade 4 can be reduced. Therefore, the blade 4 and the shielding portion 3 enable improvement of the drainage function of the drain 1 while rectifying the fluid flowing into the inlet E and removing foreign matter. Here, the diameter Da may be the diameter of the largest circle that contacts any two points of the shielding portion 3 within the shielding portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. In the present embodiment, since the shielding portion 3 is circular as viewed from the direction of the central axis C2 of the drain pipe portion 2, the diameter Da is equal to the diameter of the shielding portion 3 as viewed from the direction of the central axis C2 of the drain pipe portion 2. The minimum length L in the radial direction of the drain pipe portion 2 of the blade 4 is the minimum length in the radial direction of the drain pipe portion 2 at the portion of the blade 4 where the inlet E is located. The portion of the blade 4 where the inlet E is located is the portion between the second surface 332 of the flange 33 that defines the inlet E and the upstream end 2a of the drain pipe portion 2 in the direction of the central axis C2 of the drain pipe portion 2 in the blade 4. Also, even if Da ≥ D, it is preferable that Da < 1.5D. This can reduce the possibility that the shielding portion 3 becomes too large with respect to the drain pipe portion 2.

[0065] In the drain 1, let the dimension of the inlet E in the direction of the central axis C2 of the drain pipe portion 2 be h. The drain 1 satisfies 0.15D ≤ h ≤ 1.20D. When h is smaller, the entrainment of air from the eaves gutter 10 can be reduced, but on the other hand, the loss during the inflow of water from the eaves gutter 10 increases. Conversely, when h becomes larger, although the loss during the inflow of water from the eaves gutter 10 can be reduced, the entrainment of air from the eaves gutter 10 tends to increase. Therefore, by satisfying 0.15D ≤ h ≤ 1.20D, it is possible to achieve both reduction of the entrainment of air from the eaves gutter 10 and reduction of the loss during the inflow of water from the eaves gutter 10. This enables improvement of the drainage function while enabling removal of foreign matter.

[0066] In the drain 1, when the representative value of the curvature radius of the inner peripheral surface of the connection part 23 in the cross section passing through the central axis C2 of the drain tube part 2 is Rd, 0.05D≦Rd≦0.20D is satisfied. This can reduce the loss of water when it flows in from the eaves gutter 10, and can improve the drainage function while enabling the removal of foreign matter. The inner peripheral surface of the connection part 23 in the cross section passing through the central axis C2 of the drain tube part 2 may be a free-form surface determined by multiple radii of curvature, rather than a simple arc-shaped curved surface determined by a single radius of curvature. In such a case, the representative value Rd may be the average value of multiple radii of curvature that define the inner peripheral surface of the connection part 23 in the cross section passing through the central axis C2 of the drain tube part 2. Note that the representative value Rd may be a statistical value such as a mode, a maximum value, a minimum value, or a median value, rather than the average value of multiple radii of curvature that define the inner peripheral surface of the connection part 23 in the cross section passing through the central axis C2 of the drain tube part 2.

[0067] In the drain 1 described above, even when an elbow that is not prone to siphoning, such as a DLL elbow, is connected downstream of the drain 1, the elbow is likely to fill with water, i.e., the siphoning is likely to occur. In addition, since the flow of water into the drain 1 is not easily obstructed when the pipe is nearly full, the drainage capacity is expected to improve.

[0068] Referring again to Fig. 2, the joint 11 is used to connect the drain 1 to a piping member. The piping member may be, for example, a straight pipe, an elbow, or a socket. In this embodiment, the joint 11 is connected to the upright pipe 12 via a socket 13.

[0069] The joint 11 has a tubular portion 11a and a flange 11b. The tubular portion 11a is cylindrical. A female thread 11d is formed on the inner peripheral surface of the tubular portion 11a. The inner diameter of the tubular portion 11a is larger than the outer diameter of the drain tube portion 2 of the drain 1. The female thread 11d of the tubular portion 11a corresponds to the male thread 21a of the drain tube portion 2 of the drain 1. The flange 11b is located at the upstream end of the tubular portion 11a (the upstream end in FIG. 2) and extends radially outward from the tubular portion 11a. In this embodiment, a connecting portion 11c is located between the upstream end of the tubular portion 11a and the flange 11b. The connecting portion 11c is cylindrical in shape with an inner diameter that gradually increases from the tubular portion 11a toward the flange 11b.

[0070] In the eaves gutter drainage structure 100, the drain 1 is fixed to the eaves gutter 10 using a joint 11. As shown in FIG. 2, the drain 1 is disposed at the inlet 10b of the eaves gutter 10. Here, the tube portion 21 of the drain tube portion 2 is located below the inlet 10b of the bottom wall 10a of the eaves gutter 10, and the flange 22 of the drain tube portion 2 is in contact with the upper surface of the periphery of the inlet 10b of the bottom wall 10a of the eaves gutter 10 on the downstream side. The joint 11 is attached to the tube portion 21 of the drain tube portion 2 below the inlet 10b. Specifically, the male thread 21a of the tube portion 21 and the female thread 11d of the tube portion 11a are joined. The flange 11b of the joint 11 is in contact with the lower surface of the periphery of the inlet 10b of the bottom wall 10a of the eaves gutter 10. In this manner, the flange 22 of the drain 1 and the flange 11b of the joint 11 sandwich the bottom wall 10a of the eaves gutter 10 from both above and below, thereby attaching the drain 1 and the joint 11 to the eaves gutter 10.

[0071] When the joint 11 is attached to the drain 1, the tubular portion 21 of the drain tube portion 2 of the drain 1 is located inside the tubular portion 11a and the connection portion 11c of the joint 11. The positional relationship between the joint 11 and the drain 1 is affected by the thickness of the bottom wall 10a of the eaves gutter 10, but the upstream end of the tubular portion 11a of the joint 11 is located downstream of the upstream end of the tubular portion 21 of the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2.

[0072] The standpipe 12 defines a vertical flow path. The standpipe 12 is fixed to the wall 220 of the building 200. In a gutter system, the standpipe 12 is also called a downpipe. The standpipe 12 is installed to drain rainwater from the inlet 10b. The standpipe 12 allows rainwater from the inlet 10b to flow vertically. The standpipe 12 is straight. The cross section perpendicular to the central axis of the standpipe 12 is circular. The standpipe 12 is arranged so that the direction of the central axis of the standpipe 12 coincides with the up-down direction (vertical direction). The standpipe 12 has an upstream end 12a and a downstream end 12b. The upstream end 12a is the end of the standpipe 12 that is connected to the inlet 10b (the upper end in FIG. 1). The downstream end 12b is the end of the upright pipe 12 that is inserted into the manhole 310 (the lower end in FIG. 1). In FIG. 1, a piping cover 12c is arranged so that rainwater does not flow into the manhole 310 through a gap between the upright pipe 12 and the manhole 310. The length of the upright pipe 12 is preferably 3 m or more.

[0073] The socket 13 connects the joint 11 and the upright pipe 12. In this embodiment, the tubular portion 11a of the joint 11 is connected to a receiving port on the upstream side of the socket 13, and the upstream end portion 12a of the upright pipe 12 is connected to a receiving port on the downstream side of the socket 13.

[0074] As an example, the material of the standpipe 12 and the socket 13 is rigid polyvinyl chloride. The dimensions of the standpipe 12, such as the outer shape 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 13, such as the outer shape and thickness, may be set in accordance with the standard for sockets of JIS K 6739 "rigid polyvinyl chloride pipe joints for drainage."

[0075] [1.1.2 Effects, etc.] The above-mentioned fixed drain 1 has an upstream end 2a and a downstream end 2b, and includes a drain tube portion 2 having a cylindrical portion 21 and an annular flange 22 extending radially outward from the upstream end side of the cylindrical portion 21, a shielding portion 3 disposed at the upstream end 2a of the drain tube portion 2 and forming an inlet E between the shielding portion 3 and the flange 22, and one or more blades 4 protruding from the upstream end 2a of the drain tube portion 2. When viewed from the direction of the central axis C2 of the drain tube portion 2, at least a part of the one or more blades 4 does not overlap with the shielding portion 3. Let the inner diameter of the cylindrical portion 21 be D, the outer diameter of the flange 22 be Df, the diameter representing the outer shape of the shielding portion 3 when viewed from the direction of the central axis C2 of the drain tube portion 2 be Da, and the minimum length of the one or more blades 4 in the radial direction of the drain tube portion 2 be L. Then, D≤Da and (D - Da) / 2 < L < (Df - Da)×0.75 are satisfied. This configuration enables the removal of foreign matter while improving the drainage function.

[0076] In the drain 1, the minimum length L of the one or more blades 4 in the radial direction of the drain tube portion 2 is the minimum length in the radial direction of the drain tube portion 2 at the portion of the one or more blades 4 located at the inlet E. This configuration enables the removal of foreign matter while improving the drainage function.

[0077] In the drain 1, when the dimension of the inlet E in the direction of the central axis C2 of the drain tube portion 2 is h, 0.15D≤h≤1.20D is satisfied. This configuration enables the removal of foreign matter while improving the drainage function.

[0078] In the drain 1, the drain tube portion 2 includes a connecting portion 23 between the upstream end of the cylindrical portion 21 and the flange 22. The connecting portion 23 is in a cylindrical shape with an inner diameter gradually increasing from the cylindrical portion 21 toward the flange 22. When the representative value of the radius of curvature of the inner peripheral surface of the connecting portion 23 in a cross-section passing through the central axis C2 of the drain tube portion 2 is Rd, 0.05D≤Rd≤0.20D is satisfied. This configuration enables the removal of foreign matter while improving the drainage function.

[0079] In the drain 1, 40mm≤D≤150mm is satisfied. This configuration enables the removal of foreign matter while improving the drainage function.

[0080] In the drain 1, the shielding portion 3 has one or more openings (first opening 3a and second opening 3b). When viewed from the direction of the central axis C2 of the drain tube portion 2, the one or more openings (first opening 3a and second opening 3b) are located inside the tube portion 21. This configuration enables the removal of foreign matter while improving the drainage function.

[0081] [1.2 Second embodiment] [1.2.1 Configuration] Fig. 6 is a cross-sectional view of an eaves gutter drainage structure 100A including a drain 1A according to embodiment 2. The eaves gutter drainage structure 100A includes the drain 1A, an eaves gutter 10, a joint 11, a standpipe 12, and a socket 13. Note that the standpipe 12 and the socket 13 are omitted from Fig. 6.

[0082] The drain 1A includes a drain tube portion 2, a shielding portion 3, and one or more blades 4. In this embodiment, the drain 1A includes five blades 4. Here, one blade 4A of the five blades 4 has a shape different from the other blades 4.

[0083] The first end 41a of the main body 41 of the blade 4A protrudes further toward the central axis C2 of the drain tube portion 2 than the blade 4. As a result, the blade 4A has an overlapping portion 44 that overlaps with the shielding portion 3 when viewed from the direction of the central axis C2 of the drain tube portion 2. The overlapping portion 44 is separated from the shielding portion 3 in the direction of the central axis C2 of the drain tube portion 2. In other words, even at the overlapping portion 44, the blade 4A does not contact the surface (second surfaces 312, 332) of the shielding portion 3 facing the drain tube portion 2.

[0084] In the drain 1A, if the maximum length of the overlapping portion 44 in the radial direction of the drain tube portion 2 as viewed from the direction of the central axis C2 of the drain tube portion 2 is M, it is preferable that M≦Da / 4 is satisfied. This makes it possible to remove foreign matter while improving the drainage function.

[0085] [1.2.2 Effects, etc.] In the drain 1A described above, at least one (blade 4A) of one or more blades 4 has an overlapping portion 44 that overlaps with the shielding portion 3 when viewed from the direction of the central axis C2 of the drain tube portion 2. The overlapping portion 44 is separated from the shielding portion 3 in the direction of the central axis C2 of the drain tube portion 2. If the maximum value of the length of the overlapping portion 44 in the radial direction of the drain tube portion 2 when viewed from the direction of the central axis C2 of the drain tube portion 2 is M, then M≦Da / 4 is satisfied. This configuration enables the removal of foreign matter while improving the drainage function.

[0086] [2. Modifications] The embodiments of the present disclosure are not limited to the above-mentioned embodiments. The above-mentioned embodiments can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Below, modified examples of the above-mentioned embodiments are listed. The modified examples described below can be applied in appropriate combination.

[0087] In the following, reference will be made to symbols used in the first embodiment even though they are applicable to either the first or second embodiment described above. However, this is merely for the purpose of simplifying the description and is not intended to exclude application to the second embodiment.

[0088] The eaves gutter drainage structure to which the drain 1 described above can be applied is not limited to the eaves gutter drainage structure 100 shown in FIG.

[0089] [2.1 Variation 1] 7 is a schematic diagram of an eaves gutter drainage structure 100B according to Modification 1. The eaves gutter drainage structure 100A includes a drain 1, an eaves gutter 10, a joint 11, a vertical pipe 12, a horizontal pipe 14, a first elbow 15-1, and a second elbow 15-2.

[0090] In the eaves gutter drainage structure 100B, the vertical pipe 12 is connected to the joint 11 via the horizontal pipe 14, a first elbow 15-1, and a second elbow 15-2.

[0091] The horizontal pipe 14 defines a flow path in a direction intersecting the vertical direction. In the gutter system, the horizontal pipe 14 is also called a call gutter. The horizontal pipe 14 is a part for flowing rainwater from the building 200 from the inlet 10b to the standpipe 12. The horizontal pipe 14 is between the inlet 10b of the rainwater from the building 200 and the standpipe 12. The horizontal pipe 14 is a straight pipe. The cross section perpendicular to the central axis of the horizontal pipe 14 is circular. The horizontal pipe 14 is fixed so that the direction of the central axis of the horizontal pipe 14 is inclined with respect to the up-down direction (vertical direction). The horizontal pipe 14 has an upstream end 14a and a downstream end 14b. The upstream end 14a is the end of the horizontal pipe 14 that is connected to the inlet 10b (the left end in FIG. 7). The downstream end 14b is the end of the horizontal pipe 14 that is connected to the standpipe 12 (the right end in FIG. 7). As an example, the material of the horizontal pipe 14 is rigid polyvinyl chloride. The dimensions of the horizontal pipe 14, for example, the outer shape and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "rigid polyvinyl chloride pipes."

[0092] The first elbow 15-1 and the second elbow 15-2 change the direction of the flow passage. The first elbow 15-1 and the second elbow 15-2 are connection joints that connect flow passages with different directions, such as a vertical pipe and a horizontal pipe.

[0093] Each of the first elbow 15-1 and the second elbow 15-2 has a curved pipe portion (bent portion) 15a and sockets 15b, 15c. The curved pipe portion 15a and the sockets 15b, 15c are formed as a continuous integral part. As an example, the material of the first elbow 15-1 and the second elbow 15-2 is rigid polyvinyl chloride. The dimensions of the first elbow 15-1 and the second elbow 15-2 may be set in accordance with the standard JIS K 6739 "Rigid polyvinyl chloride pipe joints for drainage."

[0094] Each of the first elbow 15-1 and the second elbow 15-2 is a 45° elbow (so-called 45L) defined in JIS K 6739. In each of the first elbow 15-1 and the second elbow 15-2, the angle between the central axes of the sockets 15b, 15c is 45°.

[0095] In the eaves gutter drainage structure 100B, the tubular portion 11a of the joint 11 is connected to the socket 15b of the first elbow 15-1, and the upstream end portion 14a of the horizontal pipe 14 is connected to the socket 15c of the first elbow 15-1. The downstream end portion 14b of the horizontal pipe 14 is connected to the socket 15b of the second elbow 15-2, and the upstream end portion 12a of the vertical pipe 12 is connected to the socket 15c of the second elbow 15-2. In this way, a flow path for rainwater from the eaves gutter 10 to the manhole portion 310 is formed.

[0096] [2.2 Variation 2] 8 is a schematic diagram of an eaves gutter drainage structure 100C according to Modification 2. The eaves gutter drainage structure 100C includes a drain 1, an eaves gutter 10, a joint 11, a vertical pipe 12, and an eccentric socket 16.

[0097] In the eaves gutter drainage structure 100C, the upright pipe 12 is connected to the joint 11 via an eccentric socket 16.

[0098] The eccentric socket 16 has an eccentric portion 16a and sockets 16b and 16c. The eccentric portion 16a and the sockets 16b and 16c are formed as a continuous unit. As an example, the material of the eccentric socket 16 is hard polyvinyl chloride. The eccentric socket 16 may be a so-called S socket.

[0099] In the eaves gutter drainage structure 100C, the tubular portion 11a of the joint 11 is connected to the socket 16b of the eccentric socket 16, and the upstream end portion 12a of the standpipe 12 is connected to the socket 16b of the eccentric socket 16. In this manner, a flow path for rainwater from the eaves gutter 10 to the manhole portion 310 is formed.

[0100] [2.3 Variation 3] 9 is a schematic diagram of an eaves gutter drainage structure 100D according to Modification 3. The eaves gutter drainage structure 100D includes a drain 1, eaves gutters 10-1 and 10-2, a joint 11, vertical pipes 12-1 and 12-2, horizontal pipes 14-1 and 14-2, first to third elbows 15-1 to 15-3, a tee 17, a drain 18, and a piping member 19.

[0101] The eaves gutter 10-1 receives rainwater from the roof 210 of the building 200. The eaves gutter 10-1 is installed below the roof 210 of the building 200. The eaves gutter 10-2 receives rainwater from a roof or eaves below the roof 210 of the building 200. For example, the eaves gutter 10-2 is installed below the eaves gutter 10-1.

[0102] The drain 1 is disposed at the inlet 10b of the eaves gutter 10-1.

[0103] The drain 18 is disposed at the inlet 10b of the eaves gutter 10-2. The drain 18 does not necessarily have to have the same configuration as the drain 1. The drain 18 may have a known configuration.

[0104] The vertical pipe 12-1 is connected to the eaves gutter 10-1 (drain 1 installed in the eaves gutter 10-1) via a horizontal pipe 14-1, a first elbow 15-1, a second elbow 15-2, and a piping member 19. The vertical pipe 12-2 is connected to the eaves gutter 10-2 (drain 18 installed in the eaves gutter 10-2) via a horizontal pipe 14-2, a third elbow 15-3, and a tee 17.

[0105] The horizontal pipe 14-1 is located between the eaves gutter 10-1 and the vertical pipe 12-1. The horizontal pipe 14-2 is located between the eaves gutter 10-2 and the vertical pipe 12-2. The length of the horizontal pipe 14-1 is 2 m or less, preferably 1 m or less.

[0106] The first elbow 15-1 connects the eaves gutter 10-1 to the upstream end 14a of the horizontal pipe 14-1. The second elbow 15-2 connects the downstream end 14b of the horizontal pipe 14-1 to the upstream end 12a of the vertical pipe 12-1. The third elbow 15-3 connects the eaves gutter 10-2 to the upstream end 14a of the horizontal pipe 14-2.

[0107] In this modification, the first elbow 15-1 is a 90° large bend elbow (so-called LL) defined in JIS K 6739. The second elbow 15-2 and the third elbow 15-3 are 90° elbows (so-called DL) defined in JIS K 6739.

[0108] The Tee 17 has a first receiving port 17a facing upward, a second receiving port 17b facing downward, and a third receiving port 17c facing sideways. The Tee 17 merges the fluid flowing in from the first receiving port 17a with the fluid flowing in from the third receiving port 17c, and causes the fluid to flow out from the second receiving port 17b. The angle between the central axis of the first receiving port 17a and the central axis of the third receiving port 17c is 90° or less. As an example, the angle between the central axis of the first receiving port 17a and the central axis of the third receiving port 17c is set to 88.83°. As an example, the material of the Tee 17 is hard polyvinyl chloride.

[0109] The first socket 17a is connected to the downstream end 12b of the standpipe 12-1. The second socket 17b is connected to the upstream end 12a of the standpipe 12-2. The third socket 17c is connected to the downstream end 14b of the horizontal pipe 14-2.

[0110] In the eaves gutter drainage structure 100D, a first elbow 15-1 and a second elbow 15-2 are provided between the eaves gutter 10-1 and the upright pipe 12-1. The flow path direction changes in each of the first elbow 15-1 and the second elbow 15-2. When the flow path direction changes, pressure loss due to separation can be a factor in the decrease in flow rate. In this modification, the radius of curvature of the second elbow 15-2 is smaller than the radius of curvature of the first elbow 15-1. Therefore, the pressure loss caused by the second elbow 15-2 tends to be larger than the pressure loss caused by the first elbow 15-1. In order to reduce the decrease in flow rate due to the pressure loss caused by the second elbow 15-2, a piping member 19 is provided.

[0111] The piping member 19 is disposed between the second elbow 15-2 and the upright pipe 12-1. The piping member 19 includes a straight pipe portion 19a and a protruding member 19b.

[0112] The straight pipe section 19a has a straight pipe shape and includes a socket 191 at its downstream end. The socket 191 is provided to connect the upstream end 12a of the standpipe 12-1 to the straight pipe section 19a. The upstream end of the straight pipe section 19a is connected to the socket 15c of the second elbow 15-2.

[0113] The protruding member 19b is located on the downstream side of the second elbow 15-2. More specifically, the protruding member 19b is located on the inner peripheral side of the second elbow 15-2 within the straight pipe section 19a on the downstream side of the second elbow 15-2, and is used to partially reduce the flow path cross-sectional area.

[0114] The surface of the protruding member 19b has a curved shape that protrudes from the inner periphery side to the outer periphery side of the second elbow 15-2. The height of the protruding member 19b changes along the direction of the central axis of the upright pipe 12-1. The protruding member 19b has a top portion, where the height is the highest, between the upstream end and the downstream end. The height of the protruding member 19b increases monotonically from the upstream end to the top portion. The height of the protruding member 19b decreases monotonically from the top portion to the downstream end. The protruding member 19b makes the flow path cross-sectional area of ​​the upright pipe 12-1 the smallest at the top portion.

[0115] In this way, by providing the protruding member 19b, a reduced portion exists downstream of the second elbow 15-2 where the flow path cross-sectional area is smaller than the flow path cross-sectional area of ​​the upright pipe 12-1. The presence of such protruding member 19b is expected to (1) make it easier for the fluid to flow along the pipe wall than in the absence of the protruding member 19b, and (2) reduce the number of portions where pressure loss may occur. Therefore, the protruding member 19b can reduce the occurrence of pressure loss due to separation downstream of the second elbow 15-2, and can improve the flow rate.

[0116] In the eaves gutter drainage structure 100D, rainwater from the eaves gutter 10-1 flows through the first elbow 15-1, horizontal pipe 14-1, second elbow 15-2, piping member 19, and vertical pipe 12-1 into the tee 17. Rainwater from the eaves gutter 10-2 flows through the third elbow 15-3 and horizontal pipe 14-2 into the tee 17. The rainwater from the eaves gutter 10-1 and the rainwater from the eaves gutter 10-2 join together at the tee 17 and pass through the vertical pipe 12-2 to be discharged into the manhole section 310.

[0117] [2.4 Other Modifications] In one modified example, the drain tube portion 2, the shielding portion 3, and the one or more blades 4 may be formed by injection molding of a resin such as hard polyvinyl chloride resin, polycarbonate, ABS, etc., or may be made of a metal such as cast iron. The drain tube portion 2, the shielding portion 3, and the one or more blades 4 may be formed as a single continuous integral part, or may be formed separately.

[0118] In one modified example, the drain tube portion 2 does not necessarily have to have the connection portion 23.

[0119] In one modified example, the outer shape of the shielding part 3 as viewed from the direction of the central axis C2 of the drain tube part 2 is not limited to a circular shape, and may be an ellipse, a polygon (triangle, square, pentagon, etc.), or other shape. For example, the outer shape of the reduced diameter part 31, the small diameter tube part 32, or the flange 33 is not limited to a circular shape, and may be an ellipse, a polygon, or other shape. This is because the optimal value of the dimension h of the inlet E in the direction of the central axis C2 of the drain tube part 2 differs depending on the positional relationship between the shielding part 3 and the blade 4. In particular, the outer shape of the shielding part 3 as viewed from the direction of the central axis C2 of the drain tube part 2 may be an ellipse. When the outer shape of the shielding part 3 as viewed from the direction of the central axis C2 of the drain tube part 2 is an ellipse, the diameter Da representing the outer shape of the shielding part 3 as viewed from the direction of the central axis C2 of the drain tube part 2 may be a minor diameter. As another example, the outer shape of the shielding part 3 as viewed from the direction of the central axis C2 of the drain tube part 2 may be an ellipse. When the outer shape of the shielding part 3 when viewed from the direction of the central axis C2 of the drainage tube part 2 is rectangular, the diameter Da representing the outer shape of the shielding part 3 when viewed from the direction of the central axis C2 of the drainage tube part 2 may be equal to the short side.

[0120] In one modified example, the shielding portion 3 may not have either the small diameter cylindrical portion 32 or the flange 33, or both.

[0121] In one modified example, the shielding part 3 is not limited to a funnel shape. The shielding part 3 may be flat. In this case, the shielding part 3 may have one or more openings, or may not have any openings. The shielding part 3 may be cylindrical in shape, the inner diameter and the outer diameter of which do not change in the direction of the central axis C3. The shielding part 3 may be a solid member, not a hollow member. When viewed from the direction of the central axis C3 of the shielding part 3, the outer shape of the shielding part 3 is not limited to a circular shape, and may be an elliptical shape, a polygonal shape, or other shapes. The shielding part 3 may be configured as a connecting part that connects multiple blades 4, or may be connected to the drain tube part 2 without the blades 4 or through a member other than the blades 4.

[0122] In one modified example, the number of the blades 4 is not particularly limited. The number of the blades 4 may be one or more.

[0123] In one modified example, the arm 42 of the blade 4 does not necessarily need to extend to the reduced diameter portion 31. In other words, the arm 42 does not need to have the second portion 42b. The height of the second portion 42b relative to the drain tube portion 2 does not need to decrease as it approaches the center of the reduced diameter portion 31.

[0124] In one modified example, the first end 41a of the main body 41 may be configured with one or more inclined portions so as to move away from or towards the shielding portion 3 as it approaches the drain tube portion 2.

[0125] In one modified example, the gap G may be provided by shortening the length of the main body 41 of the blade 4 in the radial direction of the drain tube portion 2, or by forming a notch in the main body 41 on the shielding portion 3 side. In short, the gap G may be provided so that the flange 33 of the shielding portion 3 and the main body 41 of the blade 4 are spaced apart from each other in the radial direction of the drain tube portion 2.

[0126] [3. Aspects] As is apparent from the above embodiment and modifications, the present disclosure includes the following aspects.

[0127] [Aspect 1] A drain tube portion having an upstream end portion and a downstream end portion, the drain tube portion including a tube portion and an annular flange extending radially outward from the upstream end portion of the tube portion; A shielding portion is disposed at an end portion on the upstream side of the drain tube portion and forms an inlet between the flange and the shielding portion; One or more blades protruding from an upstream end of the drain tube portion; Equipped with When viewed from the direction of the central axis of the drain tube portion, at least a portion of the one or more blades does not overlap with the shielding portion, The inner diameter of the cylindrical portion is D, The outer diameter of the flange is Df, The diameter Da represents the outer shape of the shielding part as viewed from the direction of the central axis of the drainage tube part. If the minimum length of the one or more blades in the radial direction of the drain tube portion is L, D≦Da, and (D-Da) / 2 <L<(Df-Da)×0.75 Fulfilling Drain.

[0128] [Aspect 2] The minimum length of the one or more blades in the radial direction of the drain tube portion is the minimum length of the one or more blades in the radial direction of the drain tube portion at a portion located at the inlet, Drain of embodiment 1.

[0129] [Aspect 3] The outer shape of the shielding portion as viewed from the direction of the central axis of the drain tube portion is an ellipse, The diameter representing the outer shape of the shielding part as viewed from the direction of the central axis of the drainage tube part is the minor axis. The drain of embodiment 1 or 2.

[0130] [Aspect 4] If the dimension of the inlet in the direction of the central axis of the drain tube is h, 0.15D≦h≦1.20D Fulfilling The drain according to any one of embodiments 1 to 3.

[0131] [Aspect 5] The drain tube portion includes a connection portion between an upstream end of the tube portion and the flange, the connection portion is tubular in shape, the inner diameter of which gradually increases from the tubular portion toward the flange, In a cross section passing through the central axis of the drain tube portion, if a representative value of the radius of curvature of the inner peripheral surface of the connection portion is Rd, 0.05D≦Rd≦0.20D Fulfilling The drain according to any one of embodiments 1 to 4.

[0132] [Aspect 6] 40mm≦D≦150mm Fulfilling The drain according to any one of embodiments 1 to 5.

[0133] [Aspect 7] The shielding portion has one or more openings, When viewed from the direction of the central axis of the drain tube portion, the one or more openings are located inside the tube portion. The drain according to any one of embodiments 1 to 6.

[0134] [Aspect 8] At least one of the one or more blades has an overlapping portion that overlaps with the shielding portion when viewed from the direction of the central axis of the drain tube portion, The overlapping portion is spaced apart from the shielding portion in the direction of the central axis of the drain tube portion, If the maximum value of the length of the overlapping portion in the radial direction of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is M, M≦Da / 4 Fulfilling The drain according to any one of embodiments 1 to 7.

[0135] Modes 2 to 8 are not essential. [Industrial Applicability]

[0136] The present disclosure is applicable to drains. Specifically, the present disclosure is applicable to drains for use in eaves gutters. [Explanation of symbols]

[0137] 1, 1A drain 2 Drain pipe section 2a Upstream end 2b Downstream end 2c Drop hole 21 Cylinder part 22 Flange 23 Connection 3 Shield part 3a 1st opening 3b 2nd opening 31 Reduced diameter part 33 Flange 4, 4A Feather 44 Overlap 100, 100B, 100C, 100D eave gutter drainage structure E Inlet G Gap C2 center axis

Claims

1. A drain tube portion having an upstream end portion and a downstream end portion, the drain tube portion including a tube portion and an annular flange extending radially outward from the upstream end portion of the tube portion; A shielding portion is disposed at an end portion on the upstream side of the drain tube portion and forms an inlet between the flange and the shielding portion; One or more blades protruding from an upstream end of the drain tube portion; Equipped with When viewed from the direction of the central axis of the drain tube portion, at least a portion of the one or more blades does not overlap with the shielding portion, The inner diameter of the cylindrical portion is D, The outer diameter of the flange is Df, The diameter Da represents the outer shape of the shielding part as viewed from the direction of the central axis of the drain tube part. If the minimum length of the one or more blades in the radial direction of the drain tube portion is L, D≦Da, and (D-Da) / 2<L<(Df-Da)×0.75 Fulfilling Drain.

2. The minimum length of the one or more blades in the radial direction of the drain tube portion is the minimum length of the one or more blades in the radial direction of the drain tube portion at a portion located at the inlet. The drain of claim 1.

3. The outer shape of the shielding portion as viewed from the direction of the central axis of the drain tube portion is an ellipse, The diameter representing the outer shape of the shielding part as viewed from the direction of the central axis of the drainage tube part is the minor axis. The drain of claim 1.

4. If the dimension of the inlet in the direction of the central axis of the drain tube portion is h, 0.15D≦h≦1.20D Fulfilling The drain of claim 1.

5. The drain tube portion includes a connection portion between an upstream end of the tube portion and the flange, the connection portion is tubular in shape, the inner diameter of which gradually increases from the tubular portion toward the flange, In a cross section passing through the central axis of the drain tube portion, if a representative value of the radius of curvature of the inner peripheral surface of the connection portion is Rd, 0.05D≦Rd≦0.20D Fulfilling The drain of claim 1.

6. 40mm≦D≦150mm Fulfilling The drain of claim 1.

7. The shielding portion has one or more openings, When viewed from the direction of the central axis of the drain tube portion, the one or more openings are located inside the tube portion. The drain of claim 1.

8. At least one of the one or more blades has an overlapping portion that overlaps with the shielding portion when viewed from the direction of the central axis of the drain tube portion, The overlapping portion is spaced apart from the shielding portion in the direction of the central axis of the drain tube portion, If the maximum value of the length of the overlapping portion in the radial direction of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is M, M≦Da / 4 Fulfilling The drain of claim 1.

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