Drain

Abstract

To provide a drain capable of improving a rectification effect and suppressing a reduction of drainage function due to a foreign material.SOLUTION: A drain 1 comprises: a drain cylinder part 2; a funnel part 3 that is disposed on an upstream side end 2a of the drain cylinder part 2 and includes a diameter-reducing part 31 whose outer diameter and inner diameter are reduced as it comes closer to the drain cylinder part 2; and one or more blades 4 connecting the drain cylinder part 2 and the funnel part 3. The one or more blades 4 do not contact with surfaces (second surfaces 312, 332) on the drain cylinder part 2 side of the funnel part 3.SELECTED DRAWING: Figure 1

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 portion, a funnel portion at the upstream end of the drain tube portion including a tapered portion whose outer diameter and inner diameter decrease as the funnel portion approaches the drain tube portion, and one or more vanes connecting the drain tube portion and the funnel portion, wherein the one or more vanes do not contact the surface of the funnel portion facing the drain tube portion. 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 the first embodiment [Diagram 2] Cross-sectional view of the eaves gutter drainage structure including the drain according to the first embodiment [Diagram 3] FIG. 1 is a perspective view of a drain according to a first embodiment; [Figure 4] FIG. 1 is a plan view of a drain according to a first embodiment; [Diagram 5] FIG. 1 is a bottom view of the drain according to the first embodiment; [Figure 6] Cross-sectional view of a drain according to a second embodiment [Figure 7] FIG. 11 is a perspective view of a drain according to a second embodiment; [Figure 8] FIG. 11 is a plan view of a drain according to a second embodiment; [Figure 9] FIG. 11 is a bottom view of the drain according to the second embodiment. [Figure 10] Schematic diagram of eaves gutter drainage structure according to modification 1 [Figure 11] Schematic diagram of eaves gutter drainage structure according to modification 2 [Figure 12] 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 First embodiment] [1.1.1 Configuration] FIG. 1 is a schematic diagram of an eaves gutter drainage structure 100 including a drain 1 according to a first embodiment.

[0013] The eaves gutter drainage structure 100 is a piping system for transporting 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. Fig. 3 is a perspective view of the drain 1. Fig. 4 is a plan view of the drain 1. Fig. 5 is a bottom view of the drain 1. Note that in Fig. 2, the upright pipe 12 and the socket 13 are omitted.

[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 portion 2a and a downstream end portion 2b. As shown in FIGS. 2 and 3, the drain tube portion 2 includes a tube portion 21 and a flange 22. The tube portion 21 is cylindrical with a constant inner diameter and outer diameter. 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 portion of the tube portion 21 and extends radially outward from the tube portion 21. The flange 22 is annular.

[0020] The inner diameter of the cylindrical portion 21 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."

[0021] 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.

[0022] [Table 1]

[0023] 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.

[0024] [Table 2]

[0025] The inner diameter of the cylindrical portion 21 may be set based on an approximate inner diameter corresponding to the nominal diameter of the pipe. In this embodiment, the inner diameter of the cylindrical portion 21 may be set to correspond to any one of the nominal diameters of 75 mm, 100 mm, and 125 mm.

[0026] As can be seen from FIGS. 4 and 5, the central axis of the drainage tubular portion 2 coincides with the central axis of the tubular portion 21 and the central axis of the flange 22.

[0027] 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.

[0028] In this embodiment, there is a connection part 23 between the upstream end of the tubular part 21 and the flange 22. The connection part 23 is cylindrical with an inner diameter that gradually increases from the tubular part 21 toward the flange 22. Therefore, in a cross section passing through the central axis of the drainage tubular part 2, the inner peripheral surface of the connection part 23 is a smooth arc-shaped curved surface.

[0029] 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 of the funnel portion 3 coincides with the central axis of the drain tube portion 2.

[0030] 2, the funnel portion 3 has a first opening 3a and a second opening 3b. The funnel portion 3 allows the fluid that has flowed in from the first opening 3a to flow into the drain tube portion 2 from the second opening 3b.

[0031] The funnel portion 3 has a reduced diameter portion 31 , a small diameter cylindrical portion 32 , and a flange 33 .

[0032] 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.

[0033] 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. Unlike the reduced diameter portion 31, the small diameter tubular portion 32 is cylindrical in shape with an inner and outer diameter that do not change. 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 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 the drain tube portion 2.

[0034] 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 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 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).

[0035] 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.

[0036] In this embodiment, the funnel portion 3 is not contained within the drain tube portion 2. In particular, in this embodiment, the end portion 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 is zero.

[0037] As can be seen from FIGS. 4 and 5, the central axis 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.

[0038] 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.

[0039] As shown in Figures 2 and 3, 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 of the drain tube portion 2, the five blades 4 are arranged at equal intervals around the central axis of the drain tube portion 2.

[0040] 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.

[0041] The blade 4 includes a main body portion 41 and an arm portion 42 .

[0042] The main body portion 41 protrudes from the upstream end portion 2a of the drain tube portion 2. The main body portion 41 is plate-shaped. In particular, the main body portion 41 is rectangular plate-shaped. The main body portion 41 extends in the radial direction of the drain tube portion 2 when viewed from the direction of the central axis of the drain tube portion 2. The thickness direction of the main body portion 41 is perpendicular to the radial direction of the drain tube portion 2 when viewed from the direction of the central axis of the drain tube portion 2.

[0043] In the direction of the central axis 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 of the drain tube portion 2, the main body portion 41 does not protrude into the inside of the tube portion 21 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 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.

[0044] 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 (upper end portion in FIG. 2) of the main body portion 41 opposite the drain tube portion 2 toward the funnel portion 3. When viewed from the central axis direction of the drain tube portion 2, the arm portion 42 extends in the radial direction of the drain tube portion 2.

[0045] 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 d 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 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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 abuts on the upper surface of the periphery of the inlet 10b of the bottom wall 10a of the eaves gutter 10. 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 abuts on 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 fixing the drain 1 and the joint 11 to the eaves gutter 10.

[0050] When the joint 11 is attached to the drain 1, the tubular portion 21 and the connection portion 23 of the drain 1 are located within the tubular portion 11a and the connection portion 11c of the joint 11, respectively. 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 at the same position as the upstream end of the tubular portion 21 of the drain tubular portion 2 in the direction of the central axis of the drain tubular portion 2, or downstream of the upstream end of the tubular portion 21 of the drain tubular portion 2.

[0051] 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.

[0052] 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.

[0053] 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."

[0054] [1.1.2 Effects, etc.] The drain 1 described above comprises a drain tube section 2, a funnel section 3 at the upstream end 2a of the drain tube section 2, including a reduced diameter section 31 whose outer and inner diameters become smaller as it approaches the drain tube section 2, and one or more blades 4 connecting the drain tube section 2 and the funnel section 3, and the one or more blades 4 do not contact the surface (second surfaces 312, 332) of the funnel section 3 facing the drain tube section 2. This configuration improves the straightening effect and makes it possible to suppress a decrease in drainage function caused by foreign matter.

[0055] In the drain 1, one or more blades 4 are not located between the funnel portion 3 and the drain tube portion 2. This configuration makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0056] In the drain 1, one or more blades 4 include a main body 41 protruding from the upstream end 2a of the drain tube portion 2, and an arm 42 connecting the main body 41 to a surface (first surfaces 311, 331) of the funnel portion 3 opposite the drain tube portion 2. This configuration makes it possible to further suppress deterioration of the drainage function caused by foreign matter.

[0057] 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. The arm portion 42 connects the flange 33 and the reduced diameter portion 31 to the main body portion 41. This configuration can improve the strength of the connection between the blade 4 and the funnel portion 3.

[0058] In the drain 1, the portion (second portion 42b) of the arm portion 42 connected to the reduced diameter portion 31 becomes lower in height relative to the drain tube portion 2 as it approaches the center of the reduced diameter portion 31. This configuration can increase the inflow of rainwater into the funnel portion 3. Furthermore, this configuration can reduce the possibility of vortexes occurring in the drain tube portion 2 even when rainwater flows into the funnel portion 3.

[0059] In the drain 1, the flange 33 is annular. The outer diameter of the flange 33 is smaller than the inner diameter of the drain tube portion 2. This configuration makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0060] [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.

[0061] Fig. 7 is a perspective view of the drain 1A, Fig. 8 is a plan view of the drain 1A, and Fig. 9 is a bottom view of the drain 1A.

[0062] The drain 1A includes a drain tube portion 2, a funnel portion 3A, and one or more blades 4A. In this embodiment, the drain 1A includes seven blades 4A.

[0063] 6 and 7, the funnel portion 3A is located at the upstream end 2a of the drain tube portion 2. More specifically, the funnel portion 3A is disposed opposite the upstream end 2a of the drain tube portion 2, with the central axis of the funnel portion 3A coinciding with the central axis of the drain tube portion 2. The funnel portion 3A is not disposed within the drain tube portion 2.

[0064] 6, the funnel portion 3A has a first opening 3a and a second opening 3b. The funnel portion 3A allows the fluid that has flowed in from the first opening 3a to flow into the drain tube portion 2 from the second opening 3b.

[0065] The funnel portion 3A has a reduced diameter portion 31, a small diameter cylindrical portion 32, and a large diameter cylindrical portion 34A.

[0066] The large diameter tubular portion 34A protrudes from the end of the reduced diameter portion 31 opposite the drain tube portion 2 (the upper end in FIG. 6). The large diameter tubular portion 34A extends on the opposite side to the drain tube portion 2. Unlike the reduced diameter portion 31, the large diameter tubular portion 34A is cylindrical in shape with an inner diameter and an outer diameter that do not change. The inside of the large diameter tubular portion 34A is connected to the inside of the reduced diameter portion 31. The outer peripheral surface 341 and the inner peripheral surface 342 of the large diameter tubular portion 34A are 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 the drain tube portion 2. The outer diameter of the large diameter tubular portion 34A is smaller than the inner diameter of the drain tube portion 2 (the inner diameter of the tube portion 21).

[0067] As can be seen from Figures 8 and 9, in the funnel portion 3A, the opening at the end of the large diameter cylindrical portion 34A opposite the drainage cylindrical portion 2 is the first opening 3a, and the opening at the end of the small diameter cylindrical portion 32 facing the drainage cylindrical portion 2 is the second opening 3b.

[0068] As can be seen from FIGS. 8 and 9, the central axis of funnel portion 3A coincides with the central axis of reduced diameter portion 31, the central axis of small diameter cylindrical portion 32, and the central axis of large diameter cylindrical portion 34A.

[0069] In the funnel portion 3A, the outer peripheral surface 341 of the large diameter cylindrical portion 34A is an outer surface whose normal direction in the funnel portion 3A is perpendicular to the central axis of the drainage cylindrical portion 2. In particular, the outer peripheral surface 341 of the large diameter cylindrical portion 34A is the outermost outer surface in the funnel portion 3A.

[0070] As shown in Figures 6 and 7, in this embodiment, the number of blades 4A is five. The five blades 4A have the same shape. As shown in Figure 8, in a plan view, the five blades 4A are arranged at equal intervals around the central axis of the drain tube portion 2.

[0071] The blade 4A connects the drain tube portion 2 and the funnel portion 3A. More specifically, the blade 4A connects the upstream end portion 2a of the drain tube portion 2 and the outer surface of the funnel portion 3A whose normal direction is perpendicular to the central axis of the drain tube portion 2. In other words, the funnel portion 3A is located at the upstream end portion 2a of the drain tube portion 2 so as to be connected to the blade 4 in the horizontal direction.

[0072] The blade 4A protrudes from the upstream end 2a of the drain tube portion 2. The blade 4A is plate-shaped. In particular, the blade 4A is rectangular plate-shaped. The thickness direction of the blade 4A is perpendicular to the radial direction of the drain tube portion 2 when viewed from the central axis direction of the drain tube portion 2.

[0073] The blade 4A is connected to the funnel portion 3A at an end (the upper end in FIG. 6) of the blade 4A opposite to the drain tube portion 2. As shown in FIG. 6 and FIG. 7, the blade 4A is connected to the outer circumferential surface 341 of the large diameter tube portion 34A.

[0074] As shown in FIG. 6, the end 411 of the blade 4A opposite to the funnel portion 3A extends along the central axis of the drain tube portion 2. On the other hand, the end 412 of the blade 4A on the funnel portion 3A side is inclined with respect to the central axis of the drain tube portion 2 so as to move away from the funnel portion 3A as it approaches the drain tube portion 2. Therefore, the blade 4A moves away from the funnel portion 3A as it approaches the drain tube portion 2. This makes it possible to expand the space between the drain tube portion 2, the funnel portion 3A, and the blade 4A. Therefore, it is possible to further suppress the deterioration of the drain function caused by foreign matter. Furthermore, since the blade 4A moves away from the funnel portion 3A as it approaches the drain tube portion 2, the strength of the blade 4A can be maintained.

[0075] In the direction of the central axis of the drain tube portion 2, the blade 4A 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 of the drain tube portion 2, the blade 4A does not protrude into the inside of the tube portion 21 of the drain tube portion 2. This allows the space between the drain tube portion 2, the funnel portion 3A, and the blade 4A to be expanded. This makes it possible to further suppress the deterioration of the drainage function caused by foreign matter. Furthermore, since the blade 4A 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 4A can be maintained.

[0076] In this embodiment, as shown in FIG. 6, the blade 4A does not contact the surface (second surface 312) of the funnel portion 3A on the drain tube portion 2 side. Therefore, the space between the funnel portion 3A and the drain tube portion 2 can be expanded, and the possibility of a foreign object being caught can be reduced. Therefore, the drain 1A 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 4A is not located between the funnel portion 3A and the drain tube portion 2. Therefore, the space between the funnel portion 3A 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 1A can further suppress the deterioration of the drainage function caused by the foreign object.

[0077] The drain 1A, like the drain 1, is fixed to the eaves gutter 10 by using a joint 11. As shown in Fig. 6, the flange 22 of the drain 1A and the flange 11b of the joint 11 sandwich the bottom wall 10a of the eaves gutter 10 from both above and below, thereby fixing the drain 1A and the joint 11 to the eaves gutter 10.

[0078] [1.2.2 Effects, etc.] The drain 1A described above comprises a drain tube section 2, a funnel section 3A at the upstream end 2a of the drain tube section 2, including a reduced diameter section 31 whose outer and inner diameters become smaller as it approaches the drain tube section 2, and one or more blades 4A connecting the drain tube section 2 and the funnel section 3A, and the one or more blades 4A do not contact the surface (second surface 312) of the funnel section 3A facing the drain tube section 2. This configuration improves the straightening effect and makes it possible to suppress a decrease in drainage function caused by foreign matter.

[0079] In the drain 1A, one or more blades 4A are not located between the funnel portion 3A and the drain tube portion 2. This configuration makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0080] In the drain 1A, one or more blades 4A connect the outer surface (outer peripheral surface 341) of the funnel portion 3A, whose normal direction is perpendicular to the central axis of the drain tube portion 2, to the drain tube portion 2. This configuration makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0081] In the drain 1A, the funnel portion 3A includes a large-diameter cylindrical portion 34A having a constant outer diameter that protrudes from the end of the reduced-diameter portion 31 opposite the drain tube portion 2, and one or more blades 4A connect the outer circumferential surface 341 of the large-diameter cylindrical portion 34A to the drain tube portion 2. This configuration can improve the strength of the connection between the blades 4 and the funnel portion 3.

[0082] In the drain 1A, the outer diameter of the large diameter tubular portion 34A is smaller than the inner diameter of the drain tubular portion 2. This configuration makes it possible to further suppress the deterioration of the drainage function caused by foreign matter.

[0083] In the drain 1A, one or more blades 4A move away from the funnel portion 3A as they approach the drain tube portion 2. This configuration makes it possible to further suppress deterioration of the drainage function caused by foreign matter.

[0084] [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.

[0085] 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.

[0086] 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.

[0087] [2.1 Variation 1] 10 is a schematic diagram of an eaves gutter drainage structure 100B according to Modification 1. The eaves gutter drainage structure 100B 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 15-22.

[0088] 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.

[0089] 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. 10). The downstream end 14b is the end of the horizontal pipe 14 that is connected to the standpipe 12 (the right end in FIG. 10). 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."

[0090] 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.

[0091] 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."

[0092] 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°.

[0093] 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.

[0094] [2.2 Variation 2] 11 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.

[0095] In the eaves gutter drainage structure 100C, the upright pipe 12 is connected to the joint 11 via an eccentric socket 16.

[0096] 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.

[0097] 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.

[0098] [2.3 Variation 3] 12 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.

[0099] 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.

[0100] The drain 1 is disposed at the inlet 10b of the eaves gutter 10-1.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] The protruding member 19b is located on the downstream side of the second elbow 15-2. More specifically, the protruding member 6 is located on the inner circumferential side of the second elbow 15-2 within the straight pipe section 19a on the downstream side of the second elbow 15-2, and is used to partially reduce the flow path cross-sectional area.

[0112] 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.

[0113] 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.

[0114] 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.

[0115] [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.

[0116] In one modified example, the drain tube portion 2 does not necessarily have to have the connection portion 23.

[0117] In one modified example, when viewed from the direction of the central axis 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.

[0118] In one modified example, the funnel portion 3 may not have either the small diameter cylindrical portion 32 or the flange 33, or both.

[0119] 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.

[0120] 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.

[0121] In one modified example, the blade 4A may not move away from the funnel portion 3A as it approaches the drain tube portion 2. Thus, the end portion 412 of the main body portion 41A on the funnel portion 3A side may extend along the central axis of the drain tube portion 2.

[0122] [3. Aspects] As is apparent from the above embodiment and modifications, the present disclosure includes the following aspects.

[0123] [Aspect 1] A drain tube portion; 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 do not contact the surface of the funnel portion facing the drain tube portion. Drain.

[0124] [Aspect 2] The one or more blades are not located between the funnel portion and the drain tube portion. Drain of embodiment 1.

[0125] [Aspect 3] The one or more blades include A main body portion protruding from an upstream end of the drain tube portion; an arm portion connecting a surface of the funnel portion opposite to the drain tube portion and the main body portion; Including, The drain of embodiment 1 or 2.

[0126] [Aspect 4] 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 connects the flange and the reduced diameter portion to the body portion. Drain of embodiment 3.

[0127] [Aspect 5] The height of the portion of the arm connected to the reduced diameter portion relative to the drain tube portion decreases as the portion approaches the center of the reduced diameter portion. Drain of embodiment 4.

[0128] [Aspect 6] The flange is annular, The outer diameter of the flange is smaller than the inner diameter of the drain tube portion. The drain of embodiment 4 or 5.

[0129] [Aspect 7] The one or more blades connect an outer surface of the funnel portion whose normal direction is perpendicular to the central axis of the drain tube portion to the drain tube portion, The drain of embodiment 1 or 2.

[0130] [Aspect 8] The funnel portion includes a large-diameter tubular portion having a constant outer diameter protruding from an end of the reduced diameter portion opposite the drain tubular portion, The one or more blades connect the outer circumferential surface of the large diameter cylindrical portion to the drain cylindrical portion, Drain of embodiment 7.

[0131] [Aspect 9] The outer diameter of the large diameter cylindrical portion is smaller than the inner diameter of the drain cylindrical portion. Drain of embodiment 8.

[0132] [Aspect 10] The one or more blades move away from the funnel portion as they approach the drain tube portion. Drain of embodiment 9.

[0133] Aspects 2 to 10 are optional elements and are not essential. [Industrial Applicability]

[0134] The present disclosure is applicable to drains for eaves gutters. Specifically, the present disclosure is applicable to drains for drainage used in eaves gutters. [Explanation of symbols]

[0135] 1,1A Drain 2 Drain pipe part 3,3A funnel part 31 Reduced diameter part 311 1st surface (opposite side of the drain tube in the funnel section) 312 2nd surface (surface of the funnel part facing the drain tube) 33 Flange 331 1st surface (opposite side of the drain tube in the funnel section) 332 2nd surface (surface of the funnel part facing the drain tube) 34A Large diameter cylinder 341 Outer surface (outer surface of funnel) 4,4A Feather 41 Main body 42 Arm 42b Second part (part)

Claims

1. A drain tube portion; 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 do not contact the surface of the funnel portion facing the drain tube portion. Drain.

2. The one or more blades are not located between the funnel portion and the drain tube portion. The drain of claim 1.

3. The one or more blades include A 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 drain of claim 1.

4. 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 connects the flange and the reduced diameter portion to the body portion. The drain of claim 3.

5. The height of the portion of the arm connected to the reduced diameter portion relative to the drain tube portion decreases as the portion approaches the center of the reduced diameter portion. The drain of claim 4.

6. The flange is annular, The outer diameter of the flange is smaller than the inner diameter of the drain tube portion. The drain of claim 4.

7. The one or more blades connect an outer surface of the funnel portion whose normal direction is perpendicular to the central axis of the drain tube portion to the drain tube portion, The drain of claim 1.

8. The funnel portion includes a large-diameter tubular portion having a constant outer diameter protruding from an end of the reduced diameter portion opposite the drain tubular portion, The one or more blades connect an outer circumferential surface of the large diameter cylindrical portion to the drain cylindrical portion. The drain of claim 7.

9. The outer diameter of the large diameter cylindrical portion is smaller than the inner diameter of the drain cylindrical portion. The drain of claim 8.

10. The one or more vanes move away from the funnel portion as they approach the drain tube portion. The drain of claim 9.

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