Drain

Abstract

To provide a drain capable of improving a rectification effect and suppressing reduction of a drainage function due to a foreign material.SOLUTION: A drain 1 comprises: a drain cylinder part 2 having a drop port 2c; a funnel part 3; a body part 41 protruding from the drain cylinder part 2; and a blade 4 including an arm part 42 to connect the funnel part 3 and the body part 41. The drain satisfies 70 mm≤D≤150 mm, 0.6D≤d≤1.5D, 5 mm≤a≤15 mm, 0.40d≤b≤0.75d, 0.1d≤c≤0.5D, and 2 mm≤t≤6 mm, where an inner diameter of the drop port 2c is D, a diameter representing outer shape of the funnel part 3 is d, a distance between an end of the blade 4 on the opposite side of the drain cylinder part 2 and a surface of the funnel part 3 on the opposite side of the drain cylinder part 2 is a, a distance between a first end 41a of the body part 41 on the central axis C2 side and the central axis C2 of the drain cylinder part 2 is b, a length of a connection part between the arm part 42 and the funnel part 3 is c, and a thickness of the blade 4 is t.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 can improve the flow straightening effect and suppress deterioration of drainage function caused by foreign matter. [Means for solving the problem]

[0006] A drain according to one embodiment of the present disclosure comprises a drain tube section having a drop outlet, a funnel section at an upstream end of the drain tube section, the funnel section including a tapered section whose outer diameter and inner diameter become smaller as the drain tube section is approached, and one or more blades connecting the drain tube section and the funnel section, the one or more blades including a plate-shaped main body section protruding from the upstream end of the drain tube section, and an arm section connecting the main body section to a surface of the funnel section opposite the drain tube section, the main body section having a first end section on the central axis side of the drain tube section when viewed from the direction of the central axis of the drain tube section, and a second end section on the opposite side to the central axis of the drain tube section when viewed from the direction of the central axis of the drain tube section, If the diameter is D, the diameter representing the outer shape of the funnel section when viewed from the direction of the central axis of the drain tube section is d, the distance between the end of one or more blades opposite the drain tube section and the face of the funnel section opposite the drain tube section in the direction of the central axis of the drain tube section is a, the distance between the first end of the main body section and the central axis of the drain tube section when viewed from the direction of the central axis of the drain tube section is b, the length of the connection part between the arm section and the funnel section when viewed from the direction of the central axis of the drain tube section is c, and the thickness of one or more blades is t, the following relationships are satisfied: 70≦D≦150, 0.6D≦d≦1.5D, 5≦a≦15, 0.40d≦b≦0.75d, 0.1d≦c≦0.5D, and 2≦t≦6. Effect of the Invention

[0007] Aspects of the present disclosure enable improvement of the flow straightening effect and suppression of deterioration of drainage function caused by foreign matter. [Brief description of the drawings]

[0008] [Figure 1] Schematic diagram of an eaves gutter drainage structure including a drain according to an embodiment. [Diagram 2] Cross-sectional view of an eaves gutter drainage structure including a drain according to an embodiment. [Diagram 3] FIG. 1 is a perspective view of a drain according to an embodiment; [Figure 4] FIG. 1 is a plan view of a drain according to an embodiment; [Diagram 5] 1 is a bottom view of a drain according to an embodiment of the present invention; [Figure 6] FIG. 1 is a side view of a drain according to an embodiment of the present invention; [Figure 7]1 is a cross-sectional view of a drain according to an embodiment of the present invention; [Figure 8] Enlarged view of the part indicated by P1 in Figure 7. [Figure 9] Schematic diagram of eaves gutter drainage structure according to modification 1 [Figure 10] Schematic diagram of eaves gutter drainage structure according to modification 2 [Figure 11] Schematic diagram of the eaves gutter drainage structure according to the third modification DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 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. FIG. 6 is a side view of the drain 1. FIG. 7 is a cross-sectional view of the drain 1. Here, FIG. 2 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 7 is a cross-sectional view taken along line BB in FIG. 4. FIG. 8 is an enlarged view of the portion indicated by P1 in FIG. 7.

[0018] The drain 1 includes a drain tube portion 2, a funnel 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] The inner diameter D (see FIG. 2) of the cylindrical portion 21 defines the inner diameter of the drop port 2c. The inner diameter D of the drop port 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."

[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 (i.e., the inner diameter of the drop opening 2c) may be set to satisfy 70 mm≦D≦150 mm. For example, the inner diameter D of the drop opening 2c 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 funnel portion 3 is located at the upstream end 2a of the drain tube portion 2. More specifically, the funnel portion 3 is disposed opposite the upstream end 2a of the drain tube portion 2 such that the central axis C3 of the funnel portion 3 coincides with the central axis C2 of the drain tube portion 2.

[0031] 2 and 7, the funnel portion 3 has a first opening 3a and a second opening 3b. The funnel portion 3 directs the fluid that has flowed in from the first opening 3a to the outlet 2c of the drain tube portion 2 from the second opening 3b.

[0032] The funnel portion 3 has a reduced diameter portion 31 , a small diameter cylindrical portion 32 , and a flange 33 .

[0033] As shown in FIG. 7, 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 to 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 radially outward from the end of the reduced diameter portion 31 opposite the drain tube 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 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 facing the drain tube 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 tube portion 2 (the inner diameter of the tube portion 21).

[0036] 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 the drain tube portion 2 is the first opening 3a, and the opening at the end of the small diameter tube portion 32 facing the drain tube portion 2 is the second opening 3b.

[0037] As can be seen from Figures 2 and 7, in this embodiment, the funnel portion 3 is not contained within 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 funnel 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 funnel 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 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.

[0039] In the funnel 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 funnel portion 3 opposite the drain tube 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 form the surface of the funnel portion 3 facing the drain tube portion 2. In addition, the outer peripheral portion 33a of the flange 33 forms the outer peripheral portion of the funnel portion 3 when viewed from the direction of the central axis C2 of the drain tube portion 2.

[0040] The diameter representing the outer shape of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2 is defined as d. It is preferable that 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 touches any two points of the funnel portion 3 within the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2. In this embodiment, since the funnel portion 3 has a circular shape as viewed from the direction of the central axis C2 of the drain tube portion 2, the diameter d is equal to the diameter of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2 (particularly the diameter of the flange 33).

[0041] 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.

[0042] The blade 4 connects the drain tube portion 2 and the funnel portion 3. More specifically, the blade 4 connects the upstream end portion 2a of the drain tube portion 2 to the surface of the funnel portion 3 opposite the drain tube portion 2. In other words, the funnel portion 3 is located at the upstream end portion 2a of the drain tube portion 2 so as to be suspended from the blade 4.

[0043] The blade 4 includes a main body portion 41 , an arm portion 42 , and a reinforcing portion 43 .

[0044] 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. The width of the main body 41 determines the width of the blade 4. When the width of the blade 4 is t, it is preferable that the drain 1 satisfies 2 mm ≦ t ≦ 6 mm.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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 tube 2 as viewed from the direction of the central axis C2 of the drain tube 2 is b. It is preferable that b is set to satisfy 0.40d ≦ b ≦ 0.75d. By setting b to 0.40d or more, the space between the drain tube 2, the funnel portion 3, and the blade 4 can be expanded while obtaining the straightening effect of the blade 4, thereby making it possible to further suppress the deterioration of the drainage function caused by foreign matter. On the other hand, if b is too large, the entire drain 1 will become large, so b is preferably 0.75d or less.

[0049] In particular, in this embodiment, the first end 41a of the main body 41 is located outside the reduced diameter portion 31 when viewed from the direction of the central axis C2 of the drain tube portion 2. This allows the space between the drain tube portion 2, the funnel portion 3, and the blades 4 to be further expanded. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. In addition, a swirling flow is more likely to occur between the reduced diameter portion 31 and the blades 4, which is expected to improve the drainage function.

[0050] In particular, in this embodiment, 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 located outside the flange 33. This configuration can further expand the space between the drain tube portion 2, the funnel portion 3, and the blades 4. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0051] On the other hand, 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 port 2c of the drain tube portion 2. This enables the blades 4 to improve the flow straightening effect.

[0052] As shown in FIG. 2 and FIG. 7, the first end 41a of the main body 41 is inclined so as to move away from the central axis C2 of the drain tube 2 as it approaches the drain tube 2 along the central axis C2 of the drain tube 2. This allows the space between the drain tube 2, the funnel 3, and the blade 4 to be expanded. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. In particular, in this embodiment, the first end 41a includes first and second inclined portions 41a1 and 41a2 that are inclined so as to move away from the central axis C2 of the drain tube 2 as it approaches the drain tube 2 along the central axis C2 of the drain tube 2. The first inclined portion 41a1 is an upstream portion of the first end 41a, and the second inclined portion 41a2 is a downstream portion of the first end 41a. Therefore, the second inclined portion 41a2 is between the first inclined portion 41a1 and the drain tube 2. In this embodiment, the first and second inclined portions 41a1 and 41a2 have different inclination angles with respect to the central axis C2 of the drain tube portion 2. In particular, the second inclined portion 41a2 has a larger inclination angle with respect to the central axis C2 of the drain tube portion 2 than the first inclined portion 41a1. This makes it possible to shorten the length of the first end portion 41a in the direction of the central axis C2 of the drain tube portion 2 while preventing the presence of sharp corners in the drop opening 2c. This makes it possible to improve the drainage function of the first end portion 41a of the blade 4.

[0053] 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.

[0054] 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.

[0055] The third end 41c is farther from the drain tube portion 2 in the direction of the central axis C2 of the drain tube 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 tube portion 2, the distance between the end (third end 41c) of one or more blades 4 opposite the drain tube portion 2 and the surface (first surface 331 of the flange 33) of the funnel portion 3 opposite the drain tube portion 2 is 5 mm or more and 15 mm or less. That is, as shown in FIG. 6, if the distance between the end (third end 41c) of one or more blades 4 opposite the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 and the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 is a1, and the distance between the surface (first surface 331) of the funnel portion 3 opposite the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 and the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 is a2, 5 mm ≦ a1-a2 ≦ 15 mm is satisfied. Here, if a1-a2=a, a indicates the distance between the end (third end 41c) of the blade 4 opposite the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 and the face (first face 331) of the funnel portion 3 opposite the drain tube portion 2. This makes it possible to improve the strength of the connection between the funnel portion 3 and the blade 4. Here, it is more preferable that a (=a1-a2)=9 mm.

[0056] The fourth end 41d is also the part of the main body 41 that is connected to the drain tube portion 2.

[0057] 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 funnel portion 3, and the blade 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 blade 4 can be maintained.

[0058] In this embodiment, as shown in FIG. 4 and FIG. 6, 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 and FIG. 7, the fillet 41e extends along the main body 41, and like the main body 41, it extends not only to the flange 22 of the drain tube 2 but also to the connection portion 23. The fillet 41e includes a first portion 41e1 at the flange 22 and a second portion 41e2 at the connection portion 23. In particular, in the second portion 41e2, 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 body portion 41. This enables the drainage function of the fillet 41e to be improved. In the second portion 41e2, the radius of curvature or the width of the fillet 41e may decrease to zero.

[0059] The arm portion 42 connects the face (first faces 311, 331) of the funnel 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 funnel 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.

[0060] 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 funnel 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 improve the inflow of rainwater into the funnel portion 3. Furthermore, even if rainwater flows into the funnel portion 3, the possibility of vortex generation in the drain tube portion 2 can be reduced.

[0061] As shown in FIG. 2 and FIG. 4, the length of the connection portion between the arm portion 42 and the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2 is defined as c. In this embodiment, c is equal to the distance between the tip of the arm portion 42 as viewed from the direction of the central axis C2 of the drain tube portion 2 and the outer periphery of the funnel portion 3 (the outer periphery 33a of the flange 33). It is preferable that c is set to satisfy 0.1d≦c≦0.5D. When c is 0.1d or more, 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 FIG. 2 and FIG. 4, the distance between the tip of the arm portion 42 as viewed from the direction of the central axis C2 of the drain tube portion 2 and the central axis C2 of the drain tube portion 2 is defined as e. It is preferable that e is e≦0.25d. This allows the strength of the connection between the funnel portion 3 and the blade 4 to be improved.

[0062] In this embodiment, as shown in Figures 4 and 7, the width of the arm 42 increases as it approaches the central axis C2 of the drain tube 2 when viewed from the direction of the central axis C2 of the drain tube 2. In particular, at the tip portion of the second part 42b of the arm 42, the width of the arm 42 increases as it approaches the central axis C2 of the drain tube 2 when viewed from the direction of the central axis C2 of the drain tube 2. This enables the strength of the connection between the funnel portion 3 and the blade 4 to be improved. The minimum width of the arm 42 is equal to the width of the main body 41.

[0063] In this embodiment, as shown in FIG. 4, FIG. 7 and FIG. 8, 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 funnel 3 and the blade 4 to be improved. In this embodiment, as shown in FIG. 4 and FIG. 7, the fillet 42c extends along the arm 42, and extends to the reduced diameter portion 31 as well as the flange 33 of the funnel 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 funnel 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.

[0064] The reinforcing part 43 is provided to improve the strength of the blade 4. As shown in FIG. 4, the reinforcing part 43 is located at a position overlapping with the outer peripheral part of the funnel part 3 (the outer peripheral part 33a of the flange 33) when viewed from the direction of the central axis C2 of the drain cylinder part 2. The width direction of the reinforcing part 43 is orthogonal to the radial direction of the drain cylinder part 2 when viewed from the direction of the central axis C2 of the drain cylinder part 2. Particularly as understood from FIG. 8, the width of the reinforcing part 43 becomes larger as it approaches the funnel part 3 (flange 33) in the direction of the central axis C2 of the drain cylinder part 2. When a force is applied to the funnel part 3 or the blade 4, stress tends to concentrate on the part of the blade 4 corresponding to the outer peripheral part of the funnel part 3. Therefore, the presence of the reinforcing part 43 can reduce the possibility of damage to the blade 4 due to such stress. Let the maximum value of the width of the reinforcing part 43 be t1. It is preferably set so as to satisfy 1.1t < t1 < 1.4t.

[0065] In the present embodiment, referring to FIGS. 2 and 3, in the direction of the central axis C2 of the drain cylinder part 2, the surface 43a of the reinforcing part 43 on the drain cylinder part 2 side is farther from the drain cylinder part 2 than the surface on the drain cylinder part 2 side of the outer peripheral part of the funnel part 3 (the second surface 332 of the flange 33). In FIG. 2, the position of the surface 43a of the reinforcing part 43 on the drain cylinder part 2 side is indicated by h1, and the position of the surface on the drain cylinder part 2 side of the outer peripheral part of the funnel part 3 (the second surface 332 of the flange 33) is indicated by h2. Thereby, when a force is applied to the funnel part 3 or the blade 4, the reinforcing part 43 can easily absorb stress, and the possibility of damage to the blade 4 can be reduced.

[0066] In the present embodiment, the reinforcing part 43 is located between the main body part 41 and the arm part 42 when viewed from the direction of the central axis C2 of the drain cylinder part 2. When a force is applied to the funnel part 3 or the blade 4, stress tends to concentrate on the connection part between the main body part 41 and the arm part 42 in the blade 4. Therefore, the presence of the reinforcing part 43 can reduce the possibility of damage to the blade 4 due to such stress.

[0067] In this embodiment, the reinforcing portion 43 is located at a position overlapping with the outer periphery of the funnel portion 3 (the outer periphery 33a of the flange 33) when viewed from the direction of the central axis C2 of the drain tube portion 2. In addition, in the direction of the central axis C2 of the drain tube portion 2, the surface 43a of the reinforcing portion 43 on the drain tube portion 2 side is farther from the drain tube portion 2 than the surface on the drain tube portion 2 side of the outer periphery of the funnel portion 3 (the second surface 332 of the flange 33). As a result, as shown in FIG. 2, there is a gap G between the main body portion 41 and the end of the outer periphery of the funnel portion 3 on the drain tube portion 2 side. Due to the gap G, the blade 4 is not in contact with the outer end of the drain 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 funnel portion 3 are separated from each other in the radial direction of the drain tube portion 2. Therefore, the space between the drain tube section 2, the funnel section 3, and the blades 4 can be expanded, making it possible to further suppress the 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.

[0068] In this embodiment, as shown in FIG. 2, the blade 4 does not contact the surface (second surface 312, 332) of the funnel portion 3 on the drain tube portion 2 side. Therefore, the space between the funnel portion 3 and the drain tube portion 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 funnel portion 3 and the drain tube portion 2. Therefore, the space between the funnel portion 3 and the drain tube portion 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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."

[0076] [1.2 Effects, etc.] The above-mentioned flat drain 1 includes a drain tube portion 2 having a drain outlet 2c, a funnel portion 3 at the upstream end 2a of the drain tube portion 2 and including a reduced-diameter portion 31 whose outer diameter and inner diameter decrease as it approaches the drain tube portion 2, and one or more blades 4 connecting the drain tube portion 2 and the funnel portion 3. The one or more blades 4 include a plate-shaped main body portion 41 protruding from the upstream end 2a of the drain tube portion 2, and an arm portion 42 connecting the main body portion 41 and the surface (the first surfaces 311 and 331) of the funnel portion 3 opposite to the drain tube portion 2. The main body portion 41 has a first end portion 41a on the central axis C2 side of the drain tube portion 2 as viewed from the direction of the central axis C2 of the drain tube portion 2, and a second end portion 41b opposite to the central axis C2 of the drain tube portion 2 as viewed from the direction of the central axis C2 of the drain tube portion 2. Let the inner diameter of the drain outlet 2c be D, the diameter representing the outer shape of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2 be d, the distance between the end portion (the third end portion 41c) of the one or more blades 4 on the side opposite to the drain tube portion 2 in the direction of the central axis C2 of the drain tube portion 2 and the surface (the first surface 331) of the funnel portion 3 on the side opposite to the drain tube portion 2 be a, the distance between the first end portion 41a of the main body portion 41 and the central axis C2 of the drain tube portion 2 as viewed from the direction of the central axis C2 of the drain tube portion 2 be b, the length of the connection portion between the arm portion 42 and the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2 be c, and the thickness of the one or more blades 4 be t. Then, 70 mm ≤ D ≤ 150 mm, 0.6D ≤ d ≤ 1.5D, 5 mm ≤ a ≤ 15 mm, 0.40d ≤ b ≤ 0.75d, 0.1d ≤ c ≤ 0.5D, and 2 mm ≤ t ≤ 6 mm are satisfied. This configuration enables improvement of the rectifying effect and suppression of the decrease in the drainage function caused by foreign matters.

[0077] In the drain 1, the one or more blades 4 include a reinforcing portion 43 located at a position overlapping with the outer peripheral portion (the outer peripheral portion 33a of the flange 33) of the funnel portion 3 as viewed from the direction of the central axis C2 of the drain tube portion 2. The width direction of the reinforcing portion 43 is orthogonal to 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, and the width of the reinforcing portion 43 increases as it approaches the funnel portion 3 in the direction of the central axis C2 of the drain tube portion 2. Let the maximum value of the width of the reinforcing portion 43 be t1. Then, 1.1t < t1 < 1.4t is satisfied. This configuration enables improvement of the strength of the blade 4.

[0078] In the drain 1, in the direction of the central axis C2 of the drain tube portion 2, the surface 43a of the reinforcing portion facing the drain tube portion 2 is farther from the drain tube portion 2 than the surface (the second surface 332 of the flange 33) facing the drain tube portion 2 at the outer periphery of the funnel portion 3. This configuration can reduce the possibility of damage to the blades 4.

[0079] In the drain 1, the arm 42 protrudes from the ends 2a, 2b of the first end 41a of the main body 41 opposite the drain tube 2 toward the funnel 3, and the reinforcing portion 43 is located between the main body 41 and the arm 42 when viewed from the direction of the central axis C2 of the drain tube 2. This configuration makes it possible to improve the strength of the blade 4.

[0080] In the drain 1, the width direction of the arm 42 is perpendicular to the radial direction of the drain tube 2 when viewed from the direction of the central axis C2 of the drain tube 2, and the arm 42 has fillets 42c, 42c at the end on the funnel 3 side that increase the width of the arm 42 the closer it gets to the funnel 3 in the direction of the central axis C2 of the drain tube 2. This configuration makes it possible to improve the strength of the connection between the funnel 3 and the blades 4.

[0081] In the drain 1, the width of the arm portion 42 increases as it approaches the central axis C2 of the drain tube portion 2, as viewed from the direction of the central axis C2 of the drain tube portion 2. This configuration enables the strength of the connection between the funnel portion 3 and the blades 4 to be improved.

[0082] In the drain 1, the corners of the first end 41a of the main body 41 are tapered or filleted when viewed from the direction of the central axis C2 of the drain tube portion 2. This configuration makes it easier for an operator to hold the blades 4 when installing the drain 1.

[0083] In the drain 1, the corners of the second end 41b of the main body 41 are tapered or filleted when viewed from the direction of the central axis C2 of the drain tube portion 2. This configuration makes it easier for an operator to hold the blades 4 when installing the drain 1.

[0084] In the drain 1, the funnel portion 3 has a first opening 3a and a second opening 3b, and the fluid flowing in from the first opening 3a flows from the second opening 3b to the outlet 2c of the drain tube portion 2. 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 is less than half the distance between the first opening 3a and the drain tube portion 2. This configuration can further expand the space between the drain tube portion 2, the funnel portion 3, and the blades 4. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0085] In the drain 1, 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 located outside the reduced diameter portion 31. This configuration can further expand the space between the drain tube portion 2, the funnel portion 3, and the blades 4. Therefore, it is possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0086] In the drain 1, the funnel portion 3 includes a flange 33 that extends radially outward from the end of the reduced diameter portion 31 opposite the drain tube portion 2, and the first end 41a of the main body portion 41 is located outside the flange 33 when viewed from the direction of the central axis C2 of the drain tube portion 2. This configuration can further expand the space between the drain tube portion 2, the funnel portion 3, and the blades 4. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0087] In the drain 1, there is a gap G between the main body 41 and the end of the outer periphery of the funnel 3 on the drain tube 2 side. This configuration makes it easier for a swirling flow to occur between the funnel 3 and the blades 4, and is expected to improve the drainage function.

[0088] In the drain 1, when viewed from the direction of the central axis C2 of the drain tube portion 2, the first end 41a of the main body portion 41 is within the drop port 2c of the drain tube portion 2. This configuration enables the blades 4 to improve the flow straightening effect.

[0089] In the drain 1, the first end 41a of the main body 41 is inclined along the central axis C2 of the drain tube 2 so as to move away from the central axis C2 of the drain tube 2 as it approaches the drain tube 2. This configuration can expand the space between the drain tube 2, the funnel portion 3, and the blades 4. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. Furthermore, the strength of the blades 4 can be maintained.

[0090] In the drain 1, the first end 41a of the main body 41 includes first and second inclined portions 41a1, 41a2 that incline along the central axis C2 of the drain tube 2 so as to move away from the central axis C2 of the drain tube 2 as the first end 41a approaches the drain tube 2, and the second inclined portion 41a2 is located between the first inclined portion 41a1 and the drain tube 2, and the second inclined portion 41a2 has a larger inclination angle with respect to the central axis C2 of the drain tube 2 than the first inclined portion 41a1. This configuration enables the first end 41a of the blade 4 to improve the drainage function.

[0091] In the drain 1, the drain tube portion 2 has a tube portion 21, a flange 22 at the upstream end of the tube portion 21 and extending radially outward from the tube portion 21, and a tubular connecting portion 23 between the upstream end of the tube portion 21 and the flange 22, the inner diameter of which gradually increases from the tube portion 21 toward the flange 22. 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 connecting portion 23 of the drain tube portion 2, but is not connected to the tube portion 21. This configuration can expand the space between the drain tube portion 2, the funnel portion 3, and the blade 4. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. Furthermore, the strength of the blade 4 can be maintained.

[0092] In the drain 1, the width direction of the main body 41 is perpendicular to the radial direction of the drain tube 2 when viewed from the direction of the central axis C2 of the drain tube 2, and the main body 41 has a fillet 41e at the end (fourth end 41d) on the drain tube side that increases the width of the main body 41 the closer it is to the drain tube 2 in the direction of the central axis C2 of the drain tube 2. This configuration makes it possible to improve the strength of the blades 4 relative to the drain tube 2.

[0093] In the drain 1, at least one of the radius of curvature and the width of the fillet 41e of the main body 41 becomes smaller from the second end 41b to the first end 41a of the main body 41. This configuration enables improvement of the drainage function by the fillet 41e.

[0094] In the drain 1, when viewed from the direction of the central axis C2 of the drain tube 2, the distance between the tip of the arm 42 and the central axis C2 of the drain tube 2 is e, and e≦0.25d is satisfied. This configuration enables the strength of the connection between the funnel portion 3 and the blades 4 to be improved.

[0095] [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.

[0096] 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.

[0097] [2.1 Variation 1] 9 is a schematic diagram of an eaves gutter drainage structure 100A 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.

[0098] In the eaves gutter drainage structure 100A, 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.

[0099] 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. 9). The downstream end 14b is the end of the horizontal pipe 14 that is connected to the standpipe 12 (the right end in FIG. 9). 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."

[0100] 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.

[0101] 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."

[0102] 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°.

[0103] In the eaves gutter drainage structure 100A, 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.

[0104] [2.2 Variation 2] 10 is a schematic diagram of an eaves gutter drainage structure 100B according to Modification 2. The eaves gutter drainage structure 100B includes a drain 1, an eaves gutter 10, a joint 11, a vertical pipe 12, and an eccentric socket 16.

[0105] In the eaves gutter drainage structure 100B, the upright pipe 12 is connected to the joint 11 via an eccentric socket 16.

[0106] 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.

[0107] In the eaves gutter drainage structure 100B, 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.

[0108] [2.3 Variation 3] 11 is a schematic diagram of an eaves gutter drainage structure 100C according to Modification 3. The eaves gutter drainage structure 100C 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.

[0109] 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.

[0110] The drain 1 is disposed at the inlet 10b of the eaves gutter 10-1.

[0111] 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.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] 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.

[0116] 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.

[0117] 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.

[0118] In the eaves gutter drainage structure 100C, 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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.

[0124] In the eaves gutter drainage structure 100C, 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. Then, the rainwater from the eaves gutter 10-1 and the rainwater from the eaves gutter 10-2 join at the tee 17 and pass through the vertical pipe 12-2 to be discharged into the manhole section 310.

[0125] [2.4 Other Modifications] In one variation, the drain tube portion 2, the funnel 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, or the like, or may be made of a metal such as cast iron. The drain tube portion 2, the funnel portion 3, and the one or more blades 4 may be formed as a single continuous, integral part, or may be formed separately.

[0126] In one modified example, the drain tube portion 2 does not necessarily have to have the connection portion 23.

[0127] 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 outer shape of the reduced diameter portion 31, the small diameter cylindrical portion 32, or the flange 33, is not limited to a circular shape, but may be an elliptical shape, a polygonal shape, or another shape.

[0128] In one modified example, the funnel portion 3 may not have either or both of the small diameter cylindrical portion 32 and the flange 33 .

[0129] In one modified example, the number of the blades 4 is not particularly limited. The number of the blades 4 may be 1 or more. The blades 4 may be located between the funnel portion 3 and the drain tube portion 2 as long as they do not come into contact with the surface (second surfaces 312, 332) of the funnel portion 3 facing the drain tube portion 2.

[0130] 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.

[0131] In one modified example, the arm portion 42 of the blade 4 does not necessarily need to be connected to the flange 33, and 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 tube portion 2.

[0132] In one modified example, the first end 41a of the main body 41 does not have to be inclined so as to move away from the funnel portion 3 as it approaches the drain tube portion 2. Thus, the first end 41a may extend along the central axis C2 of the drain tube portion 2.

[0133] 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 side of the funnel portion 3. In short, the gap G may be provided so that the flange 33 of the funnel 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.

[0134] [3. Aspects] As is apparent from the above embodiment and modifications, the present disclosure includes the following aspects.

[0135] [Aspect 1] A drain tube portion having a drop outlet; A funnel portion at an upstream end of the drain tube portion, the funnel portion including a reduced diameter portion whose outer diameter and inner diameter become smaller as the funnel portion approaches the drain tube portion; One or more blades connecting the drain tube portion and the funnel portion; Equipped with The one or more blades include A plate-shaped main body portion protruding from an upstream end of the drain tube portion; An arm portion that connects the surface of the funnel portion opposite the drain tube portion to the main body portion; Including, The main body portion has a first end portion on the central axis side of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, and a second end portion on the opposite side to the central axis of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The inner diameter of the drop hole is D, The diameter of the funnel portion as viewed from the direction of the central axis of the drain tube portion is d. a is a distance between an end of the one or more blades opposite the drain tube portion in the direction of the central axis of the drain tube portion and a surface of the funnel portion opposite the drain tube portion; The distance between the first end of the main body portion and the central axis of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is b, The distance between the tip of the arm portion and the outer peripheral portion of the funnel portion as viewed from the direction of the central axis of the drain tube portion is c, When the thickness of the one or more blades is t, 70 mm ≤ D ≤ 150 mm, 0.6D ≤ d ≤ 1.5D, 5 mm ≤ a ≤ 15 mm, 0.40d ≤ b ≤ 0.75d, 0.1d ≤ c ≤ 0.5D, and 2 mm ≤ t ≤ 6 mm, satisfying Drain.

[0136] [Aspect 2] The funnel portion includes a flange that extends radially outward of the drain tube portion from the end of the reduced diameter portion on the side opposite to the drain tube portion, The arm portion is connected to the reduced diameter portion without being connected to the flange, The drain of Aspect 1.

[0137] [Aspect 3] The one or more blades include a reinforcing portion located at a position overlapping the outer peripheral portion of the funnel portion as viewed from the direction of the central axis of the drain tube portion, The width direction of the reinforcing portion is orthogonal to the radial direction of the drain tube portion as viewed from the direction of the central axis of the drain tube portion, The width of the reinforcing portion increases as it approaches the funnel portion in the direction of the central axis of the drain tube portion, When the maximum value of the width of the reinforcing portion is t1, 1.1t < t1 < 1.4t is satisfied, The drain of Aspect 1 or 2.

[0138] [Aspect 4] In the direction of the central axis of the drain tube portion, the surface of the reinforcing portion on the drain tube portion side is farther from the drain tube portion than the surface of the outer peripheral portion of the funnel portion on the drain tube portion side, The drain of Aspect 3.

[0139] [Aspect 5] The arm portion protrudes toward the funnel portion from an end portion of the first end portion of the main body portion opposite the drain tube portion, The reinforcing portion is located between the main body portion and the arm portion when viewed from the direction of the central axis of the drain tube portion. The drain of embodiment 3 or 4.

[0140] [Aspect 6] The width direction of the arm portion is perpendicular to the radial direction of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The arm portion has a fillet at an end portion on the funnel portion side, the fillet increasing the width of the arm portion as it approaches the funnel portion in the direction of the central axis of the drain tube portion. The drain according to any one of embodiments 1 to 5.

[0141] [Aspect 7] The width of the arm portion increases as it approaches the central axis of the drain tube portion when viewed from the direction of the central axis of the drain tube portion. The drain according to any one of embodiments 1 to 6.

[0142] [Aspect 8] When viewed from the direction of the central axis of the drain tube portion, the corner of the first end of the main body portion is tapered or filleted. The drain according to any one of embodiments 1 to 7.

[0143] [Aspect 9] When viewed from the direction of the central axis of the drain tube portion, the corner of the second end portion of the main body portion is tapered or filleted. The drain according to any one of embodiments 1 to 8.

[0144] [Aspect 10] The funnel portion has a first opening and a second opening, and causes the fluid flowing in from the first opening to flow from the second opening to a drop outlet of the drain tube portion, In the direction of the central axis of the drain tube portion, the distance between the second opening and the drain tube portion is less than 1 / 2 of the distance between the first opening and the drain tube portion. The drain according to any one of embodiments 1 to 9.

[0145] [Aspect 11] When viewed from the direction of the central axis of the drain tube portion, the first end of the main body portion is located outside the reduced diameter portion. The drain according to any one of embodiments 1 to 10.

[0146] [Aspect 12] The funnel portion includes a flange extending radially outward from an end of the reduced diameter portion opposite the drain tube portion, When viewed from the direction of the central axis of the drain tube portion, the first end of the main body portion is on the outside of the flange. Drain of embodiment 11.

[0147] [Aspect 13] There is a gap between the main body and the surface of the outer periphery of the funnel portion facing the drain tube portion. The drain according to any one of embodiments 1 to 12.

[0148] [Aspect 14] When viewed from the direction of the central axis of the drain tube, the first end of the main body is within the drop opening of the drain tube. The drain of any one of embodiments 1 to 13.

[0149] [Aspect 15] The first end of the main body is inclined away from the central axis of the drain tube as it approaches the drain tube along the central axis of the drain tube. The drain according to any one of embodiments 1 to 14.

[0150] [Aspect 16] The first end of the main body includes first and second inclined portions that incline away from the central axis of the drain tube portion as the first end approaches the drain tube portion along the central axis of the drain tube portion, The second inclined portion is located between the first inclined portion and the drain tube portion, The second inclined portion has a larger inclination angle with respect to the central axis of the drain tube portion than the first inclined portion. The drain of any one of embodiments 1 to 15.

[0151] [Aspect 17] The drain tube portion is A cylindrical portion and a flange located at an upstream end of the cylindrical portion and extending radially outward of the cylindrical portion; a cylindrical connection portion between an upstream end of the cylindrical portion and the flange, the inner diameter of which gradually increases from the cylindrical portion toward the flange; having In the direction of the central axis of the drain tube portion, the main body portion is connected to the flange and the connection portion of the drain tube portion, but is not connected to the tube portion. The drain according to any one of embodiments 1 to 16.

[0152] [Aspect 18] The width direction of the main body is perpendicular to the radial direction of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The main body has a fillet at an end portion on the drain tube side, the fillet increasing the width of the main body as it approaches the drain tube in the direction of the central axis of the drain tube. The drain of any one of embodiments 1 to 17.

[0153] [Aspect 19] At least one of a radius of curvature or a width of the fillet of the body portion decreases from the first end to the second end of the body portion. Drain of embodiment 18.

[0154] [Aspect 20] If the distance between the tip of the arm portion and the central axis of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is e, e≦0.25d is satisfied. The drain of any one of embodiments 1 to 19.

[0155] The second to twentieth aspects are not essential. [Industrial Applicability]

[0156] The present disclosure is applicable to drains. Specifically, the present disclosure is applicable to drains for use in eaves gutters. [Explanation of symbols]

[0157] 1 Drain 2 Drain pipe section 2a Upstream end 2b Downstream end 2c Drop hole 21 Cylinder part 22 Flange 23 Connection 3 Funnel part 3a 1st opening 3b 2nd opening 31 Reduced diameter part 33 Flange 33a outer periphery 4. Feather 41 Main body 41a First end 41a1 1st slope part 41a2 2nd slope part 41b Second end 41c 3rd end 41d 4th end 41e Fillet 42 Arm 42c Fillet 43 Reinforcement 43a Surface of the reinforcement part facing the drain tube 100, 100A, 100B, 100C eave gutter drainage structure G Gap C2 center axis

Claims

1. A drain tube portion having a drop outlet; A funnel portion at an upstream end of the drain tube portion, the funnel portion including a reduced diameter portion whose outer diameter and inner diameter become smaller as the funnel portion approaches the drain tube portion; One or more blades connecting the drain tube portion and the funnel portion; Equipped with The one or more blades include: A plate-shaped main body portion protruding from an upstream end of the drain tube portion; An arm portion that connects the surface of the funnel portion opposite the drain tube portion to the main body portion; Including, The main body portion has a first end portion on the central axis side of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, and a second end portion on the opposite side to the central axis of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The inner diameter of the drop hole is D, The diameter of the funnel portion as viewed from the direction of the central axis of the drain tube portion is d, a distance between an end of the one or more blades opposite the drain tube portion in the direction of the central axis of the drain tube portion and a surface of the funnel portion opposite the drain tube portion; The distance between the first end of the main body portion and the central axis of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is b; The length of the connection portion between the arm portion and the funnel portion as viewed from the direction of the central axis of the drain tube portion is c, If the thickness of the one or more blades is t, 70 mm≦D≦150 mm, 0.6D≦d≦1.5D, 5 mm≦a≦15 mm, 0.40d≦b≦0.75d, 0.1d≦c≦0.5D, and 2 mm≦t≦6 mm, Fulfilling Drain.

2. The funnel portion includes a flange extending radially outward from an end of the reduced diameter portion opposite the drain tube portion, The arm portion is connected to the reduced diameter portion without being connected to the flange. The drain of claim 1.

3. The one or more blades include a reinforcing portion that is located at a position overlapping with an outer periphery of the funnel portion when viewed from the direction of the central axis of the drain tube portion, The width direction of the reinforcing portion is perpendicular to the radial direction of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The width of the reinforcing portion increases as it approaches the funnel portion in the direction of the central axis of the drain tube portion, If the maximum width of the reinforcing portion is t1, 1.1t<t1<1.4t is satisfied. The drain of claim 1.

4. In the direction of the central axis of the drain tube portion, the surface of the reinforcement portion facing the drain tube portion is farther from the drain tube portion than the surface of the outer circumferential portion of the funnel portion facing the drain tube portion. The drain of claim 3.

5. The arm portion protrudes toward the funnel portion from an end portion of the first end portion of the main body portion opposite the drain tube portion, The reinforcing portion is located between the main body portion and the arm portion when viewed from the direction of the central axis of the drain tube portion. The drain of claim 3.

6. The width direction of the arm portion is perpendicular to the radial direction of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The arm portion has a fillet at an end portion on the funnel portion side, the fillet increasing the width of the arm portion as it approaches the funnel portion in the direction of the central axis of the drain tube portion. The drain of claim 1.

7. The width of the arm portion increases as it approaches the central axis of the drain tube portion when viewed from the direction of the central axis of the drain tube portion. The drain of claim 1.

8. When viewed from the direction of the central axis of the drain tube portion, the corner of the first end of the main body portion is tapered or filleted. The drain of claim 1.

9. When viewed from the direction of the central axis of the drain tube portion, the corner of the second end portion of the main body portion is tapered or filleted. The drain of claim 1.

10. The funnel portion has a first opening and a second opening, and causes the fluid flowing in from the first opening to flow from the second opening to a drop outlet of the drain tube portion, In the direction of the central axis of the drain tube portion, the distance between the second opening and the drain tube portion is less than 1 / 2 of the distance between the first opening and the drain tube portion. The drain of claim 1.

11. When viewed from the direction of the central axis of the drain tube portion, the first end of the main body portion is located outside the reduced diameter portion. The drain of claim 1.

12. The funnel portion includes a flange extending radially outward from an end of the reduced diameter portion opposite the drain tube portion, When viewed from the direction of the central axis of the drain tube portion, the first end of the main body portion is on the outer side of the flange. The drain of claim 11.

13. There is a gap between the main body and the end of the outer periphery of the funnel on the drain tube side. The drain of claim 1.

14. When viewed from the direction of the central axis of the drain tube portion, the first end of the main body portion is within the drop opening of the drain tube portion. The drain of claim 1.

15. The first end of the main body is inclined away from the central axis of the drain tube portion as it approaches the drain tube portion along the central axis of the drain tube portion. The drain of claim 1.

16. The first end of the main body includes first and second inclined portions that incline away from the central axis of the drain tube portion as the first end approaches the drain tube portion along the central axis of the drain tube portion, The second inclined portion is located between the first inclined portion and the drain tube portion, The second inclined portion has a larger inclination angle with respect to the central axis of the drain tube portion than the first inclined portion. The drain of claim 1.

17. The drain tube portion is A cylindrical portion and a flange located at an upstream end of the cylindrical portion and extending radially outward of the cylindrical portion; a cylindrical connection portion between an upstream end of the cylindrical portion and the flange, the inner diameter of which gradually increases from the cylindrical portion toward the flange; having In the direction of the central axis of the drain tube portion, the main body portion is connected to the flange and the connection portion of the drain tube portion, but is not connected to the tube portion. The drain of claim 1.

18. The width direction of the main body is perpendicular to the radial direction of the drain tube portion when viewed from the direction of the central axis of the drain tube portion, The main body has a fillet at an end portion on the drain tube side, the fillet increasing the width of the main body as it approaches the drain tube in the direction of the central axis of the drain tube. The drain of claim 1.

19. At least one of a radius of curvature or a width of the fillet of the body portion decreases from the second end to the first end of the body portion.

20. The drain of claim 18.

20. If the distance between the tip of the arm portion and the central axis of the drain tube portion as viewed from the direction of the central axis of the drain tube portion is e, e≦0.25d is satisfied; The drain of claim 1.

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