Piping member

Abstract

To provide a piping member capable of improving the flow rate while downsizing.SOLUTION: A piping member 10 includes: a first straight pipe portion 31 as a straight pipe placed at the downstream side of a joint, which has a first receptacle and a second receptacle, the orientation of which is different from that of the first receptacle; and a projection member 6 that is placed in the first straight pipe portion 31 for partially reducing the cross-sectional area of the first straight pipe portion 31. The projection member 6 includes: a first end and a second end in the longitudinal direction of the first straight pipe portion 31 along the central axis C3; and the top 6e of the first straight pipe portion 31 placed between a third end 6c and a fourth end 6d in the width direction perpendicular to the length direction, and the first end and the second end, which minimizes the cross-sectional area of the flow path. Defining the angle between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe portion 31 in a cross section perpendicular to the central axis C3 of the first straight pipe portion 31 and passing through the top portion 6e is θ, θ is between 45° and 210°.SELECTED DRAWING: Figure 15

Description

[Technical Field]

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

[0002] Patent Document 1 discloses a siphon gutter system. The siphon gutter system disclosed in Patent Document 1 includes an eaves gutter, a siphon generating section that has a cylindrical section penetrating a water collection port formed on the bottom surface of the eaves gutter and that generates a siphon phenomenon, and an elbow. The elbow is installed downstream of the siphon gutter system. The elbow includes a curved pipe section and receiving ports provided on both ends of the curved pipe section. When viewed in cross section on a plane including the pipe axis of the curved pipe section, the radius of curvature of the inner wall surface on the inner periphery of the curved pipe section is greater than 64 mm and less than 100 mm. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-120068 Summary of the Invention [Problem to be solved by the invention]

[0004] The technology disclosed in Patent Document 1 is expected to improve the flow rate, but the elbow becomes relatively large.

[0005] The present disclosure provides a piping member that can improve flow rate while enabling miniaturization. [Means for solving the problem]

[0006] A piping member according to one embodiment of the present disclosure comprises a straight pipe arranged downstream of a fitting having a first receiving port and a second receiving port oriented differently from the first receiving port, and one or more protrusion members arranged within the straight pipe to partially reduce the flow path cross-sectional area of ​​the straight pipe, wherein the one or more protrusion members have first and second ends in a longitudinal direction along the central axis of the straight pipe, third and fourth ends in a width direction perpendicular to the longitudinal direction, and an apex located between the first and second ends and which minimizes the flow path cross-sectional area of ​​the straight pipe, and wherein θ is the angle between the third and fourth ends with respect to the central axis of the straight pipe in a cross section perpendicular to the central axis of the straight pipe and passing through the apex, and θ is greater than or equal to 45° and less than 210°. [Effects of the Invention]

[0007] Aspects of the present disclosure can improve flow rates while allowing for compactness. [Brief explanation of the drawings]

[0008] [Figure 1] Schematic diagram of a piping system according to a first embodiment [Figure 2] 1 is a cross-sectional view of a first bent pipe of a piping system according to a first embodiment; [Figure 3] 1 is a cross-sectional view of a second bent pipe of the piping system according to the first embodiment; [Figure 4] FIG. 10 is a perspective view of a downstream portion of a second bent pipe of the piping system according to the first embodiment; [Figure 5] FIG. 10 is an exploded perspective view of a downstream portion of a second bent pipe of the piping system according to the first embodiment; [Figure 6] 1 is a cross-sectional view of a downstream portion of a second bent pipe of a piping system according to a first embodiment; [Figure 7] FIG. 10 is an exploded cross-sectional view of a downstream portion of a second bent pipe of the piping system according to the first embodiment; [Figure 8] Cross section of line AA in Figure 7 [Figure 9] FIG. 1 is a perspective view of a piping member according to a first embodiment; [Figure 10] FIG. 1 is a side view of a piping member according to a first embodiment; [Figure 11] FIG. 1 is a plan view of a piping member according to a first embodiment; [Figure 12] 1 is a bottom view of a piping member according to a first embodiment; [Figure 13] Cross section of line BB in Figure 11 [Figure 14] A perspective cross-sectional view taken along line CC in Figure 11 [Figure 15] Cross section of line DD in Figure 13 [Figure 16] 1 is a diagram of a simulation of pressure distribution in a piping system of a comparative example. [Figure 17] 10 is a cross-sectional view of a piping member according to a second embodiment. [Figure 18] 10 is a cross-sectional view of a piping member according to a third embodiment. [Figure 19] FIG. 10 is another cross-sectional view of the piping member according to the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed description of already well-known matters or redundant description of substantially identical configurations may be omitted. This is to avoid unnecessary redundancy in the following description and to facilitate understanding by those skilled in the art. Note that the inventor(s) provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims.

[0010] Unless otherwise specified, the positional relationships such as up, down, left, and right are based on the positional relationships shown in the drawings. Each drawing described in the following embodiments is a schematic drawing, and the ratios of the size and thickness of each component in each drawing do not necessarily reflect the actual dimensional ratios. Furthermore, the dimensional ratios of each component are not limited to the ratios shown in the drawings.

[0011] In the following description, when it is necessary to distinguish between multiple components, prefixes such as "first" and "second" are added to the names of the components. However, when the components can be distinguished from each other by the symbols attached to them, the prefixes such as "first" and "second" may be omitted in consideration of readability of the text.

[0012] [1. Embodiment] 1.1 First Embodiment [1.1.1 Configuration] FIG. 1 is a schematic diagram of a piping system 1 according to a first embodiment. The piping system 1 is used to transport a fluid with a Reynolds number of 4000 or greater. A fluid with a Reynolds number of 4000 or greater is considered to be a fluid whose flow within a cylinder becomes turbulent. Examples of such fluids include liquids (drinking water, heat source water, wastewater, oil, etc.), gases (air, steam, etc.), and gas-liquid two-phase flow (a mixture of liquid and gas). In this embodiment, the piping system 1 is used as a drainage system. The piping system 1 is a rain gutter system that receives rainwater from the roof 11a of a building 11 and channels it to a manhole 21 on the ground 20. The piping system 1 forms a rainwater flow path. The rainwater collected in the manhole 21 flows from the manhole 21 through an underground pipe 22 and into a storm sewer. The building 11 may be, for example, a non-residential facility such as a store, office, factory, building, school, welfare facility, or hospital, or a residential facility such as a detached house, an apartment building, or each dwelling unit of a detached house or apartment building. Non-residential facilities also include theaters, movie theaters, public halls, amusement parks, complexes, department stores, hotels, inns, kindergartens, libraries, museums, art galleries, underground shopping malls, stations, and airports.

[0013] The piping system 1 includes an eaves gutter 2, a vertical pipe 3, a horizontal pipe 4, a first bent pipe 51, a second bent pipe 52, a protruding member 6, and a drain 7.

[0014] The eaves gutter 2 collects rainwater from the roof 11a of the building 11. The eaves gutter 2 is installed under the roof 11a of the building 11. As an example, the eaves gutter 2 is arranged at the eaves edge of the roof 11a. In particular, the eaves gutter 2 is arranged so as to extend along the eaves edge of the roof 11a. The eaves gutter 2 is shaped like a long bucket. The eaves gutter 2 has a bottom wall 2a. An inlet 2b is formed in the bottom wall 2a depending on the overall design of the piping system 1. The inlet 2b is, for example, a circular opening. In a rain gutter system, the inlet 2b is also referred to as a water collection inlet, a drain outlet, or a drop outlet. As an example, the eaves gutter 2 may be formed by extrusion molding of a resin material. The eaves gutter 2 may include a core material to reinforce the overall strength of the eaves gutter 2. The core material may be made of, for example, metal. As another example, the eaves gutter 2 may be formed from a metal plate, for example, a steel plate (also called a coil).

[0015] The drain 7 is disposed at the inlet 2b of the eaves gutter 2. The drain 7 reduces the generation of vortices and the entrainment of air at the inlet 2b. The drain 7 may contribute to the generation of siphoning. The drain 7 may have a known configuration.

[0016] In the piping system 1, the vertical pipe 3 is not directly connected to the inlet 2b, but is connected to the inlet 2b via the horizontal pipe 4, the first bent pipe 51, and the second bent pipe 52.

[0017] The standpipe 3 defines a vertical flow path. The standpipe 3 is fixed to the wall 11b of the building 11. In a gutter system, the standpipe 3 is also called a downspout. The standpipe 3 is installed to drain rainwater from the inlet 2b. The standpipe 3 allows rainwater from the inlet 2b to flow vertically. The standpipe 3 is straight. A cross section perpendicular to the central axis C3 of the standpipe 3 is circular. The standpipe 3 is arranged so that the direction of the central axis C3 of the standpipe 3 coincides with the up-down direction (vertical direction). The standpipe 3 has an upstream end 3a and a downstream end 3b. The upstream end 3a is the end of the standpipe 3 that is connected to the inlet 2b (the upper end in FIG. 1). The downstream end 3b is the end of the standpipe 3 that is inserted into the manhole 21 (the lower end in FIG. 1). In FIG. 1, a pipe cover 30 is arranged to prevent rainwater from flowing into the manhole 21 through a gap between the upright pipe 3 and the manhole 21.

[0018] The horizontal pipe 4 defines a flow path that intersects the vertical direction. In a gutter system, the horizontal pipe 4 is also called a call gutter. The horizontal pipe 4 is a part that allows rainwater from the building 11 to flow from the inlet 2b to the standpipe 3. The horizontal pipe 4 is located between the inlet 2b for rainwater from the building 11 and the standpipe 3. The horizontal pipe 4 is a straight pipe. The cross section perpendicular to the central axis C4 of the horizontal pipe 4 is circular. The horizontal pipe 4 is fixed so that the direction of the central axis C4 of the horizontal pipe 4 is inclined relative to the up-down direction (vertical direction). The horizontal pipe 4 has an upstream end 4a and a downstream end 4b. The upstream end 4a is the end of the horizontal pipe 4 that is connected to the inlet 2b (the left end in Figure 1). The downstream end 4b is the end of the horizontal pipe 4 that is connected to the standpipe 3 (the right end in Figure 1).

[0019] As an example, the material of the standpipe 3 and the horizontal pipe 4 is rigid polyvinyl chloride. The dimensions of the standpipe 3 and the horizontal pipe 4, such as the outer diameter and thickness, may be set in accordance with the standard for rigid polyvinyl chloride pipes (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipes."

[0020] Table 1 shows an example of the nominal diameter of VP rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) in JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 1, the units for the outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0021] [Table 1]

[0022] Table 2 shows an example of the nominal diameter of VU rigid polyvinyl chloride pipe in the standard for rigid polyvinyl chloride pipe (general) of JIS K 6741 "Rigid Polyvinyl Chloride Pipe." In Table 2, the units of outer diameter (standard dimension), thickness (minimum dimension), and approximate inner diameter are in mm.

[0023] [Table 2]

[0024] The first bent pipe 51 and the second bent pipe 52 change the direction of the flow path. The first bent pipe 51 and the second bent pipe 52 are connection joints that connect flow paths with different directions, such as a vertical pipe and a horizontal pipe.

[0025] 2 is a cross-sectional view of the first bent pipe 51. The first bent pipe 51 has a curved pipe section (bent section) 510 and sockets 511, 512 that face in different directions. The curved pipe section 510 and the sockets 511, 512 are formed as a continuous, integrated unit. The material of the first bent pipe 51, i.e., the material of the curved pipe section 510, is rigid polyvinyl chloride.

[0026] The curved pipe portion 510 has openings 511a and 512a at both ends. The curved pipe portion 510 is cylindrical, but the pipe axis (center line) A51 of the curved pipe portion 510 is curved rather than linear. In other words, the curved pipe portion 510 has a curved pipe axis A51. The pipe axis A51 of the curved pipe portion 510 defines the pipe axis of the first bent pipe 51.

[0027] Figure 2 is a cross-sectional view of the first bent tube 51 on a plane including the tube axis A51 of the bent tube portion 510. The inner diameter of the bent tube portion 510 of the first bent tube 51 in Figure 2 is approximately uniform. In Figure 2, R51 indicates the radius of curvature of the tube axis A51. The radius of curvature R51 of the tube axis A51 defines the radius of curvature of the first bent tube 51. O51 indicates the center of the circle that defines the radius of curvature R51.

[0028] 2, θ51 indicates the angle between center lines C511 and C512 of openings 511a and 512a at both ends of first bent pipe 51 in a cross section taken along a plane including pipe axis A51 of first bent pipe 51. θ51 is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage."

[0029] In FIG. 2, δ51 is the diameter [mm] of openings 511a, 512a of curved pipe portion 510. δ51 may be determined taking into consideration the target drainage capacity of piping system 1, etc. δ51 may be set in accordance with the standard JIS K 6739 "Rigid Polyvinyl Chloride Pipe Fittings for Drainage." δ51 may be set, for example, to satisfy the standard dimensions of the nominal diameter specified in JIS K 6739. According to JIS K 6739 "Rigid Polyvinyl Chloride Pipe Fittings for Drainage," when the nominal diameter is 75 mm, 100 mm, or 125 mm, the standard dimensions are 77.2 mm, 98.8 mm, and 125 mm.

[0030] 2, in a cross section of the first bent pipe 51 taken along a plane including the pipe axis A51, the bent pipe section 510 has an inner surface 510a on the inner circumferential side and an inner surface 510b on the outer circumferential side. The inner surfaces 510a, 510b are curved as a whole. Here, in a cross section of the first bent pipe 51 taken along a plane including the pipe axis A51, the radius of curvature of the inner surface 510a is greater than 54 mm and less than 125 mm.

[0031] The sockets 511 and 512 are provided at both ends of the curved pipe portion 510. The sockets 511 and 512 are provided to connect piping members to the first bent pipe 51. In this embodiment, the socket 511 is connected to the upstream end 4a of the horizontal pipe 4, and the socket 512 is connected to the drain 7. The sockets 511 and 512 are cylindrical and surround the openings 511a and 512a of the curved pipe portion 510, respectively. In FIG. 2, the sockets 511 and 512 have the same shape.

[0032] 2 shows D51, d51, and l51 as dimensions of the socket 511 of the first bent pipe 51. l51 is the length of the socket 511 (or the length of the socket 512) in a cross section taken along a plane including the pipe axis A51 of the curved pipe portion 510. D51 is the outer diameter [mm] of the socket 511 (or the socket 512). d51 is the inner diameter [mm] of the socket 511 (or the socket 512). The dimensions D51, d51, and l51 of the first bent pipe 51 may be set in accordance with, for example, the standard JIS K 6739 "Rigid polyvinyl chloride pipe joints for drainage."

[0033] 3 is a cross-sectional view of second bent pipe 52. Second bent pipe 52 has a curved pipe section (bent section) 520 and sockets 521, 522 that face in different directions. Curved pipe section 520 and sockets 521, 522 are formed as a continuous, integrated unit. The material of second bent pipe 52, i.e., the material of bent pipe section 520, is rigid polyvinyl chloride.

[0034] The curved pipe portion 520 has openings 521a and 522a at both ends. The curved pipe portion 520 is cylindrical, but the pipe axis (center line) A52 of the curved pipe portion 520 is curved rather than linear. In other words, the curved pipe portion 520 has a curved pipe axis A52. The pipe axis A52 of the curved pipe portion 520 defines the pipe axis of the second bent pipe 52.

[0035] Figure 3 is a cross-sectional view of the second bent pipe 52 on a plane including the pipe axis A52 of the bent pipe portion 520. The inner diameter of the bent pipe portion 520 of the second bent pipe 52 in Figure 3 is approximately uniform. In Figure 3, R52 indicates the radius of curvature of the pipe axis A52. The radius of curvature R52 of the pipe axis A52 defines the radius of curvature of the second bent pipe 52. O52 indicates the center of the circle that defines the radius of curvature R52.

[0036] 3, θ52 indicates the angle between center lines C521 and C522 of openings 521a and 522a at both ends of second bent pipe 52 in a cross section taken along a plane including pipe axis A52 of second bent pipe 52. θ52 is, for example, 91.17° as specified in JIS K 6739 "Rigid polyvinyl chloride pipe fittings for drainage."

[0037] In FIG. 3, δ52 is the diameter [mm] of openings 521a, 522a of curved pipe portion 520. δ52 may be determined taking into consideration the target drainage capacity of piping system 1, etc. δ52 may be set in accordance with the standard JIS K 6739 "Rigid Polyvinyl Chloride Pipe Fittings for Drainage." δ52 may be set, for example, to satisfy the standard dimensions of the nominal diameter specified in JIS K 6739. According to JIS K 6739 "Rigid Polyvinyl Chloride Pipe Fittings for Drainage," when the nominal diameter is 75 mm, 100 mm, or 125 mm, the standard dimensions are 77.2 mm, 98.8 mm, and 125 mm.

[0038] As shown in FIG. 3, in a cross section of the second bent tube 52 taken along a plane including the tube axis A52, the bent tube portion 520 has an inner surface 520a on the inner circumferential side and an inner surface 520b on the outer circumferential side. The inner surface 520a has a corner 520c. The corner 520c is located in the middle portion of the inner surface 520a between the openings 521a and 522a. The corner 520c has an R-shape. In a cross section of the second bent tube 52 taken along a plane including the tube axis A52, the radius of curvature of the corner 520c is 0 mm or more and 54 mm or less, preferably 0 mm or more and 2 mm or less. The inner surface 520b does not have a corner like the corner 520c. The inner surface 520b is curved overall.

[0039] The sockets 521 and 522 are provided at both ends of the curved pipe portion 520. The sockets 521 and 522 are provided to connect piping members to the second bent pipe 52. In this embodiment, the socket 521 is connected to the upstream end 3a of the standpipe 3, and the socket 522 is connected to the downstream end 4b of the horizontal pipe 4. The sockets 521 and 522 are cylindrical and surround the openings 521a and 522a of the curved pipe portion 520, respectively. In FIG. 3, the sockets 521 and 522 have the same shape.

[0040] 3 shows D52, d52, and l52 as dimensions of the socket 521 of the second bent pipe 52. l52 is the length of the socket 521 (or the length of the socket 522) in a cross section taken along a plane including the pipe axis A52 of the curved pipe portion 520. D52 is the outer diameter [mm] of the socket 521 (or the socket 522). d52 is the inner diameter [mm] of the socket 521 (or the socket 522). The dimensions D52, d52, and l52 of the second bent pipe 52 may be set in accordance with, for example, the standard JIS K 6739 "Rigid polyvinyl chloride pipe joints for drainage."

[0041] In this embodiment, the first bent pipe 51 and the second bent pipe 52 have the same nominal diameter. The angle θ51 between the center lines C511 and C512 of the openings 511a and 512a at both ends of the first bent pipe 51 in a cross section taken along a plane including the pipe axis A51 of the first bent pipe 51 is equal to the angle θ52 between the center lines C521 and C522 of the openings 521a and 522a at both ends of the second bent pipe 52 in a cross section taken along a plane including the pipe axis A52 of the second bent pipe 52. Meanwhile, the radius of curvature R52 of the second bent pipe 52 is smaller than the radius of curvature R51 of the first bent pipe 51. Thus, the first bent pipe 51 and the second bent pipe 52 have different shapes.

[0042] In this embodiment, the first bent pipe 51 and the second bent pipe 52 are 90° elbows. In this case, the distance between the inlet 2b and the vertical pipe 3 in the horizontal direction can be increased while shortening the length of the horizontal pipe 4. In particular, the first bent pipe 51 is a 90° large bend elbow (so-called LL) defined in JIS K 6739. The second bent pipe 52 is a 90° elbow (so-called DL) defined in JIS K 6739. The 90° elbow defined in JIS K 6739 is smaller and has better designability than the 90° large bend elbow defined in JIS K 6739. Therefore, the designability of the exterior of the piping system 1 can be improved. The piping system 1 can be made less noticeable relative to the building 11. Pipe materials of a common standard can be used for the first bent pipe 51 and the second bent pipe 52, making it easier to install the piping system 1.

[0043] The piping system 1 includes a first bent pipe 51 and a second bent pipe 52. The direction of the flow path changes in each of the first bent pipe 51 and the second bent pipe 52. When the direction of the flow path changes, pressure loss due to separation can be a factor in a decrease in flow rate. In this embodiment, the radius of curvature R52 of the second bent pipe 52 is smaller than the radius of curvature R51 of the first bent pipe 51. Therefore, the pressure loss caused by the second bent pipe 52 tends to be larger than the pressure loss caused by the first bent pipe 51. In order to reduce the decrease in flow rate due to the pressure loss caused by the second bent pipe 52, a protrusion member 6 is provided.

[0044] 1, the protruding member 6 is located downstream of the second bent pipe 52. More specifically, the protruding member 6 is located on the inner circumferential side of the second bent pipe 52 within the vertical pipe 3, which is a straight pipe section downstream of the second bent pipe 52, and is used to partially reduce the flow path cross-sectional area of ​​the vertical pipe 3.

[0045] Fig. 4 is a perspective view of the downstream portion of the second bent pipe 52 of the piping system 1. Fig. 5 is an exploded perspective view of the downstream portion of the second bent pipe 52 of the piping system 1. Fig. 6 is a cross-sectional view of the downstream portion of the second bent pipe 52 of the piping system 1. Fig. 7 is an exploded cross-sectional view of the downstream portion of the second bent pipe 52 of the piping system 1. Fig. 8 is a cross-sectional view taken along line AA of Fig. 7.

[0046] In this embodiment, the vertical pipe 3 is made up of a plurality of pipe materials. The vertical pipe 3 includes a first straight pipe portion 31 and a second straight pipe portion 32.

[0047] The first straight pipe section 31 is directly connected to the downstream side of the second bent pipe 52. Therefore, the first straight pipe section 31 is an upstream side portion of the vertical pipe 3.

[0048] The first straight pipe section 31 has a main body section 311 and a socket 312 .

[0049] The main body 311 has a straight pipe shape. As shown in Fig. 7, the main body 311 has openings 311a and 311b at a first end (upper end in Fig. 7) and a second end (lower end in Fig. 7), respectively. In the vertical pipe 3, the first end of the first straight pipe section 31 defines the upstream end 3a of the vertical pipe 3.

[0050] The socket 312 is provided at the second end of the main body 311. The socket 312 is provided to connect the second straight pipe section 32 to the first straight pipe section 31. The socket 312 is cylindrical and surrounds the opening 311b of the main body 311.

[0051] The second straight pipe section 32 is connected to the downstream side of the first straight pipe section 31. Therefore, the second straight pipe section 32 is the downstream part of the standpipe 3. The second straight pipe section 32 has a straight pipe shape. A first end (upper end in FIG. 1) of the second straight pipe section 32 is connected to the socket 312 of the first straight pipe section 31. A second end (lower end in FIG. 1) of the second straight pipe section 32 defines the downstream end 3b of the standpipe 3. The second end of the second straight pipe section 32 becomes the downstream opening point 3c of the standpipe 3 (see FIG. 1).

[0052] In the vertical pipe 3, the main body 311 of the first straight pipe portion 31 and the second straight pipe portion 32 have the same inner diameter. The inner diameters of the main body 311 of the first straight pipe portion 31 and the second straight pipe portion 32 define the flow path cross-sectional area of ​​the vertical pipe 3.

[0053] In the vertical pipe 3, the first straight pipe section 31 is shorter than the second straight pipe section 32. The length of the first straight pipe section 31 is preferably 1.0 m or less. The first straight pipe section 31 is provided with a protruding member 6. This makes it easier to arrange the protruding member 6 near the second bent pipe 52. This allows for a smaller size while improving the flow rate. Furthermore, the first straight pipe section 31 provided with the protruding member 6 is easier to carry.

[0054] In this embodiment, the first straight pipe portion 31 of the upright pipe 3 and the protrusion member 6 constitute the piping member 10. In this embodiment, the piping member 10 is constituted not by the entire upright pipe 3 but by a part of the upright pipe 3 (the first straight pipe portion 31), and therefore the portability of the piping member 10 can be improved.

[0055] Fig. 9 is a perspective view of the piping member 10. Fig. 10 is a side view of the piping member 10. Fig. 11 is a plan view of the piping member 10. Fig. 12 is a bottom view of the piping member 10. Fig. 13 is a cross-sectional view taken along line BB in Fig. 11. Fig. 14 is a perspective cross-sectional view taken along line CC in Fig. 11. Fig. 15 is a cross-sectional view taken along line DD in Fig. 13.

[0056] As shown in Figures 6, 8, and 13, the protrusion member 6 has a first end 6a and a second end 6b. The first end 6a and the second end 6b are both ends of the protrusion member 6 in the longitudinal direction. The longitudinal direction of the protrusion member 6 corresponds to the flow direction of the fluid in the standpipe 3. The flow direction of the fluid in the standpipe 3 coincides with the direction of the central axis C3 of the standpipe 3. The first end 6a is closer to the second bent pipe 52 than the second end 6b. In this embodiment, the first end 6a is the upstream end, and the second end 6b is the downstream end.

[0057] As shown in Figures 11, 12, and 15, the protrusion member 6 has a third end 6c and a fourth end 6d. The third end 6c and the fourth end 6d are both ends of the protrusion member 6 in the width direction. The width direction of the protrusion member 6 is perpendicular to the length direction of the protrusion member 6. In this embodiment, when viewed from the direction of the central axis C3 of the standpipe 3, the protrusion member 6 has a shape in which the center is more recessed than both sides. This can improve the flow rate.

[0058] As shown in Figures 6, 8, and 13, in a plane passing through the central axes C521, C522 of the openings 521a, 522a of the second bent pipe 52, the surface of the protrusion member 6 has a curved shape that protrudes from the first wall surface 31b toward the second wall surface 31c. The height of the protrusion member 6 varies along the direction of the central axis C3 of the standpipe 3. In this embodiment, the protrusion member 6 has an apex 6e between the first end 6a and the second end 6b. The apex 6e is the highest part of the protrusion member 6. The height of the protrusion member 6 increases monotonically from the first end 6a toward the apex 6e. The height of the protrusion member 6 decreases monotonically from the apex 6e toward the second end 6b. The protrusion member 6 minimizes the flow path cross-sectional area of ​​the standpipe 3 at the apex 6e.

[0059] From another perspective, the protrusion member 6 may have a shape that protrudes from the inner periphery toward the outer periphery of the second bent pipe 52 so as to produce the Coanda effect in the straight pipe section (first straight pipe section 31) on the downstream side of the second bent pipe 52. In other words, the protrusion member 6 may have a shape that produces the Coanda effect in the straight pipe section (first straight pipe section 31) on the downstream side of the second bent pipe 52. This makes it possible to improve the flow rate while making the pipe smaller.

[0060] The protruding member 6 is provided on the first straight pipe section 31 of the vertical pipe 3. More specifically, the protruding member 6 is provided on the first straight pipe section 31 so as to protrude from a first wall surface 31b on the inner periphery side of the second bent pipe 52 in the first straight pipe section 31 to a second wall surface 31c on the outer periphery side of the second bent pipe 52 in the first straight pipe section 31. Here, the first wall surface 31b is a portion of the inner periphery side of the second bent pipe 52 on the inner periphery side of the second bent pipe 52 (for example, half of the inner periphery side). The second wall surface 31c is a portion of the inner periphery side of the second bent pipe 52 on the inner periphery side of the first straight pipe section 31 (for example, half of the outer periphery side). The inner periphery surface 31a of the first straight pipe section 31 is composed of the first wall surface 31b and the second wall surface 31c.

[0061] In this way, by providing the protruding member 6 on the first straight pipe section 31 of the standpipe 3, a reduced area P where the flow path cross-sectional area of ​​the piping system 1 is smaller than the flow path cross-sectional area of ​​the standpipe 3 exists downstream of the second bent pipe 52 between the inner corner 520c of the second bent pipe 52 and the opening 311b of the first straight pipe section 31. The reduced area P is the area where the protruding member 6 exists in the standpipe 3.

[0062] As shown in FIGS. 9 and 10 , the first end 6a of the protruding member 6 protrudes to the outside from the opening 311a of the first straight pipe section 31. Therefore, when the second bent pipe 52 and the first straight pipe section 31 are connected, as shown in FIG. 6 , the first end 6a of the protruding member 6 protrudes from the opening 521a into the curved pipe section 520 of the second bent pipe 52 and covers a part of the inner surface 520a of the curved pipe section 520. The first end 6a of the protruding member 6 coincides with the corner 520c of the inner surface 520a of the curved pipe section 520. In this way, because the protruding member 6 exists across the curved pipe section 520 of the second bent pipe 52 and the first straight pipe section 31, the influence of a step that may occur at the boundary between the curved pipe section 520 of the second bent pipe 52 and the first straight pipe section 31 can be reduced.

[0063] As shown in FIGS. 9 to 11 , the first straight pipe section 31 further has markings 313. The markings 313 indicate information regarding the assembly of the first straight pipe section 31. In this embodiment, the markings 313 indicate the direction in which the first straight pipe section 31 is connected to the second bent pipe 52. The markings 313 in FIG. 9 are arrows indicating the direction in which the first straight pipe section 31 is connected to the second bent pipe 52. In FIGS. 9 to 11 , four markings 313 are arranged at equal intervals in the circumferential direction on the outer peripheral surface of the upstream end of the first straight pipe section 31. The markings 313 may be letters, figures, symbols, three-dimensional shapes, colors, or combinations thereof that are recognizable by human perception. In this embodiment, the markings 313 are located on the outer peripheral surface of the first straight pipe section 31 so as not to be hidden by the socket 521 of the second bent pipe 52 when the first straight pipe section 31 is connected to the second bent pipe 52. However, the mark 313 may be located on the outer surface of the first straight pipe section 31 in a position that is hidden by the socket 521 of the second bent pipe 52 when the first straight pipe section 31 is connected to the second bent pipe 52 .

[0064] As described above, by providing the protrusion member 6 to the first straight pipe section 31, a reduced area P where the flow path cross-sectional area of ​​the vertical pipe 3 is smaller than that of the opening 311b exists between the corner 520c of the second bent pipe 52 and the opening 311b.

[0065] Next, the function of the protruding member 6 will be described.

[0066] FIG. 16 is a diagram illustrating a simulation of pressure distribution when water flows through a piping system 100 of a comparative example. The piping system 100 of the comparative example differs from the piping system 1 in that it does not have a protruding member 6. In FIG. 16, darker colors indicate lower pressure. In particular, pressure loss is large at the portion indicated by R in FIG. 16, and the presence of such a portion can be a major factor in reducing the flow rate. The pressure loss at the portion indicated by R in FIG. 16 is thought to be due to separation. This separation occurs when water separates from the first wall surface 31b of the standpipe 3 downstream of the corner 520c of the second bent pipe 52. That is, as indicated by arrow F in FIG. 16, water flowing in from the upstream side initially flows along the pipe wall 200, but after the corner 520c of the second bent pipe 52, it may separate from the first wall surface 31b of the standpipe 3. This separation is particularly noticeable when the water flow velocity is high. The faster the flow velocity, the wider the area where pressure loss occurs.

[0067] In the piping system 1, the flow path direction changes significantly at the second bent pipe 52, and pressure loss due to separation can contribute to a decrease in flow rate. The protruding member 6 is located at the end of the standpipe 3 on the second bent pipe 52 side (the upstream end 3a). In particular, the protruding member 6 is located on the inner circumferential side of the standpipe 3 (the left side in FIG. 1 ) of the second bent pipe 52. The apex 6e of the protruding member 6 is closer to the first end 6a than to the second end 6b, and the first end 6a is closer to the second bent pipe 52 than to the second end 6b. The protruding member 6 generates a fluid flow from the first end 6a to the second end 6b. The presence of the protruding member 6 is expected to (1) facilitate fluid flow along the pipe wall more easily than in the absence of the protruding member 6 and (2) reduce the number of areas where pressure loss may occur. Therefore, the protruding member 6 reduces pressure loss due to separation downstream from the second bent pipe 52, thereby improving the flow rate. The piping system 1 can be made smaller in size simply by providing the protruding member 6, because the radius of curvature of the second bent pipe 52 can be made smaller than the radius of curvature of the first bent pipe 51. Therefore, the protruding member 6 can improve the flow rate while enabling size reduction. The protruding member 6 is located inside the standpipe 3, and is therefore inconspicuous when viewed as the piping system 1 as a whole. This is expected to improve the aesthetic appearance of the piping system 1 as a whole.

[0068] Next, an example of the dimensions of the piping member 10 will be described.

[0069] Reference is made to FIG. 15. FIG. 15 is a cross-sectional view taken along line DD in FIG. 13. That is, FIG. 15 shows a cross section perpendicular to the central axis C3 of the vertical pipe 3 (first straight pipe portion 31) and passing through the top portion 6e. In FIG. 15, the central axis C3 is virtually indicated by a black circle simply for ease of explanation. The angle between the third end 6c and the fourth end 6d and the central axis C3 of the first straight pipe portion 31 in this cross section is defined as θ. θ is preferably 45° or more and 210° or less. Preferably, θ is 60° or more. Preferably, θ is 180° or less. If θ is less than 45°, the protruding members 6 are too small relative to the flow path, and the effect of the protruding members 6 may not be fully exerted. If θ is more than 210°, the protruding members 6 are too large relative to the flow path, and pressure loss may exceed the pressure loss reduction effect of the protruding members 6. Therefore, by setting θ to 45° or more and 210° or less, it is possible to improve the flow rate while achieving compactness.

[0070] 11, 12, and 15, the protrusion member 6 has a symmetrical shape when viewed from the direction of the central axis C3 of the first straight pipe section 31. This allows the protrusion member 6 to more appropriately exert its effect when the configuration of the piping system 1 causes the fluid distribution in the first straight pipe section 31 to be symmetric when viewed from the direction of the central axis C3 of the first straight pipe section 31.

[0071] As shown in FIG. 15 , in a cross section perpendicular to the central axis C3 of the first straight pipe section 31 and passing through the top 6e, the surface of the protrusion member 6 between the third end 6c and the fourth end 6d is curved. In this embodiment, the surface of the protrusion member 6 is curved, with the center being more recessed than the two ends. Here, the curved shape is preferably a smooth curved shape. The term "smoothly curved shape" here refers to a shape without corners that would obstruct the flow of fluid. The surface of the protrusion member 6 may be a single curved surface or may be composed of multiple curved surfaces connected to each other by fillets. Therefore, the "smoothly curved shape" may be composed of a single curve or multiple curved surfaces connected to each other by fillets. This allows for a compact design while improving the flow rate.

[0072] 6 and 8. In the standpipe 3, the inner diameter of the flow path is the diameter of the standpipe 3, and the direction of the flow path is the direction of the central axis C3 of the standpipe 3. The diameter of the standpipe 3 is d, and the length of the protruding member 6 in the direction of the central axis C3 of the standpipe 3 is L. In the piping member 10, it is preferable that 0.5d≦L≦5.0d. This can further reduce the pressure loss caused by the second bent pipe 52. Therefore, the flow rate can be improved while enabling miniaturization.

[0073] 6 and 8, the apex 6e of the protruding member 6 is the portion of the reduced portion P where the cross-sectional area of ​​the flow path is smallest. The distance between the corner 520c of the second bent pipe 52 and the apex 6e in the direction of the central axis C3 of the vertical pipe 3 is defined as D1. In the piping member 10, it is preferable that 0≦D1≦0.5d. This can further reduce the occurrence of pressure loss caused by the second bent pipe 52. Therefore, the flow rate can be improved while enabling miniaturization.

[0074] In FIG. 8, the distance between the top 6e and the downstream end (second end 6b) in the direction of the central axis C3 of the vertical pipe 3 is defined as D3. D3=L-D1. In the piping member 10, it is preferable that D3>D1. This can further reduce the occurrence of pressure loss caused by the second bent pipe 52. Therefore, the flow rate can be improved while enabling miniaturization.

[0075] 11 and 13 , the distance between the top 6e and the second wall surface 31c in a plane passing through the central axes C521, C522 of the sockets 521, 522 of the second bent pipe 52 is defined as D2. In the piping member 10, it is preferable that 0.60d≦D2≦0.95d. This can further reduce the pressure loss caused by the second bent pipe 52. Therefore, it is possible to improve the flow rate while enabling miniaturization. Here, the height of the protruding member 6 at the top 6e is defined as H. H is expressed as H=d−D2. In the piping member 10, it is preferable that 0.05d≦H≦0.40d. This can further reduce the pressure loss caused by the second bent pipe 52. Therefore, it is possible to improve the flow rate while enabling miniaturization.

[0076] Referring to FIG. 15, the maximum value of the flow path cross-sectional area of ​​the standpipe 3 (maximum flow path cross-sectional area) is A, and the minimum value of the flow path cross-sectional area of ​​the standpipe 3 (minimum flow path cross-sectional area) is A1. The minimum value of the flow path cross-sectional area of ​​the standpipe 3 is the flow path cross-sectional area at the top 6e of the protruding member 6. In the piping member 10, it is preferable that (A-A1) / A≦0.5. Preferably, it is preferable that (A-A1) / A≦0.4. This can further reduce the occurrence of pressure loss caused by the second bent pipe 52. Therefore, it is possible to improve the flow rate while enabling miniaturization. Here, the maximum value of the cross-sectional area of ​​the protruding member 6 is A2. A2 is also the cross-sectional area of ​​the protruding member 6 at the top 6e of the protruding member 6. A2 = A-A1. That is, in the piping system 1, it is preferable that A2 / A≦0.5, and preferably A1 / A≦0.4.

[0077] [1.1.2 Effects, etc.] The piping member 10 described above comprises a first straight pipe section 31 disposed downstream of a joint (second bent pipe 52) having a first socket (socket 521) and a second socket (socket 522) oriented in a different direction from the socket 521, and a protrusion member 6 disposed within the first straight pipe section 31 to partially reduce the flow path cross-sectional area of ​​the first straight pipe section 31. The protrusion member 6 comprises a first end 6a and a second end 6b in the length direction along the central axis C3 of the first straight pipe section 31, a third end 6c and a fourth end 6d in the width direction perpendicular to the length direction, and a top portion 6e located between the first end 6a and the second end 6b and which minimizes the flow path cross-sectional area of ​​the first straight pipe section 31. If the angle between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe portion 31 in a cross section that is perpendicular to the central axis C3 of the first straight pipe portion 31 and passes through the top portion 6e is θ, θ is equal to or greater than 45° and equal to or less than 210°. This configuration can improve the flow rate while enabling miniaturization.

[0078] In the piping member 10, θ is equal to or greater than 60°. θ is equal to or smaller than 180°. This configuration can improve the flow rate while enabling miniaturization.

[0079] In the piping member 10, the surface of the protruding member 6 between the third end 6c and the fourth end 6d has a curved shape in a cross section perpendicular to the central axis C3 of the first straight pipe section 31 and passing through the top 6e. This configuration can improve the flow rate while enabling miniaturization.

[0080] In the piping member 10, the protruding member 6 is formed integrally and continuously with the straight pipe (first straight pipe portion 31). This configuration can reduce the likelihood of the protruding member 6 falling off or being forgotten to be attached.

[0081] In the piping member 10, if the maximum value of the flow path cross-sectional area is A and the minimum value of the flow path cross-sectional area is A1, then (A-A1) / A≦0.5. This configuration can improve the flow rate while enabling miniaturization.

[0082] In the piping member 10, if the inner diameter of the straight pipe (first straight pipe portion 31) is d and the length of one or more protrusion members 6 is L, then 0.5d≦L≦5.0d. This configuration can improve the flow rate while enabling miniaturization.

[0083] In the piping member 10, if the inner diameter of the straight pipe (first straight pipe section 31) is d and the height of the top 6e of one or more protrusion members 6 is H, then 0.05d≦H≦0.40d is satisfied. This configuration can improve the flow rate while enabling miniaturization.

[0084] 1.2 Second Embodiment [1.2.1 Configuration] 17 is a cross-sectional view of a piping member 10A according to embodiment 2. The piping member 10A includes a first straight pipe portion 31 and a protruding member 6A.

[0085] 17 shows a cross section perpendicular to the central axis C3 of the vertical pipe 3 (first straight pipe portion 31) and passing through the top 6e of the protrusion member 6A. In FIG. 17, the central axis C3 is shown imaginarily by a black circle simply for ease of explanation.

[0086] As is clear from FIG. 17, the protrusion member 6A has an asymmetric shape when viewed from the direction of the central axis C3 of the first straight pipe portion 31. In the protrusion member 6A, θ is the sum of θa and θb. Here, θa is the angle between the third end 6c and plane P1 relative to the central axis C3 of the first straight pipe portion 31 in a cross section that is perpendicular to the central axis C3 of the stand pipe 3 (first straight pipe portion 31) and passes through the top 6e of the protrusion member 6A. θb is the angle between the fourth end 6d and plane P1 relative to the central axis C3 of the first straight pipe portion 31 in a cross section that is perpendicular to the central axis C3 of the stand pipe 3 (first straight pipe portion 31) and passes through the top 6e of the protrusion member 6A. Plane P1 indicates a plane that passes through the central axes C521 and C522 of the openings 521a and 522a of the second bent pipe 52 (which are equal to the central axes of the sockets 521 and 522).

[0087] In the protrusion member 6A, θa and θb are each between 22.5° and 105°, and preferably between 30° and 90°. θa and θb are different from each other. This allows the protrusion member 6A to more appropriately exert its effect when the fluid distribution in the first straight pipe section 31 is asymmetric when viewed from the direction of the central axis C3 of the first straight pipe section 31.

[0088] [1.2.2 Effects, etc.] In the piping member 10A described above, the protruding member 6 has an asymmetric shape when viewed from the direction of the central axis C3 of the straight pipe (the vertical pipe 3, the first straight pipe portion 31). This configuration can improve the flow rate while enabling miniaturization.

[0089] 1.3 Third Embodiment 1.3.1 Configuration Fig. 18 is a cross-sectional view of a piping member 10B according to embodiment 3. Fig. 18 corresponds to a cross section on a plane passing through central axes C521 and C522 of openings 521a and 522a of second bent pipe 52 (which are equal to the central axes of sockets 521 and 522).

[0090] As shown in FIG. 18, the piping member 10B includes a first straight pipe portion 31, a first protruding member 6-1, and a second protruding member 6-2.

[0091] The configurations of the first protruding member 6-1 and the second protruding member 6-2 are the same as those of the protruding member 6 described in the first embodiment.

[0092] The first protruding member 6-1 and the second protruding member 6-2 face each other across the central axis C3 of the straight pipe (vertical pipe 3, first straight pipe portion 31). As shown in Fig. 18, the first protruding member 6-1 is located on the first wall surface 31b side, and the second protruding member 6-2 is located on the second wall surface 31c side.

[0093] Fig. 19 is another cross-sectional view of the piping member 10B according to the third embodiment. Fig. 19 shows a cross section perpendicular to the central axis C3 of the vertical pipe 3 (first straight pipe portion 31) and passing through the tops 6e of the first protrusion member 6-1 and the second protrusion member 6-2. In Fig. 19, the central axis C3 is indicated by a virtual black circle simply for ease of explanation.

[0094] For the first protrusion member 6-1, the angle θ between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe section 31 in the cross section of FIG. 19 is defined as θ1. θ1 is preferably 45° or greater and 210° or less. Preferably, θ1 is 60° or greater and 180° or less. This allows for an improvement in flow rate while enabling miniaturization.

[0095] For the second protrusion member 6-2, the angle θ between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe section 31 in the cross section of Figure 19 is defined as θ2. θ2 should be 45° or greater and 210° or less. Preferably, θ2 should be 60° or greater and 180° or less. This allows for an improvement in flow rate while enabling miniaturization.

[0096] Furthermore, it is preferable that θ1+θ2 be less than 360°. If θ1+θ2 exceeds 360°, the first protrusion member 6-1 and the second protrusion member 6-2 will be large relative to the flow path, and there is a possibility that loss due to pressure loss will exceed the effect of reducing pressure loss by the first protrusion member 6-1 and the second protrusion member 6-2. Therefore, by making θ1+θ2 less than 360°, it is possible to improve the flow rate while enabling miniaturization.

[0097] In the piping member 10B described above, the first protrusion member 6-1 and the second protrusion member 6-2 are arranged to face each other across the central axis C3 of the straight pipe (upright pipe 3, first straight pipe section 31). Depending on the distribution of fluid flow within the straight pipe, it may be preferable to have protrusion members 6 on both sides of the straight pipe. The piping member 10B can accommodate such cases, enabling miniaturization while improving the flow rate.

[0098] [1.3.2 Effects, etc.] In the piping member 10B described above, the one or more protruding members 6 include a first protruding member 6-1 and a second protruding member 6-2 that face each other across the central axis C3 of the straight pipe (upright pipe 3, first straight pipe portion 31). If θ of the first protruding member 6-1 (the angle between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe portion 31 in a cross section perpendicular to the central axis C3 of the first straight pipe portion 31 and passing through the apex 6e) is θ1, θ1 is not less than 60° and not more than 210°. If θ of the second protruding member 6-2 (the angle between the third end 6c and the fourth end 6d with respect to the central axis C3 of the first straight pipe portion 31 in a cross section perpendicular to the central axis C3 of the first straight pipe portion 31 and passing through the apex 6e) is θ2, θ2 is not less than 60° and not more than 210°. This configuration improves flow rate while enabling miniaturization.

[0099] In the piping member 10B, θ1+θ2 is less than 360°. This configuration can improve the flow rate while enabling miniaturization.

[0100] [2. Modifications] The embodiments of the present disclosure are not limited to the above-described embodiments 1 to 3. Various modifications of the above-described embodiments 1 to 3 can be made depending on the design, etc., as long as the object of the present disclosure can be achieved. Modifications of the above-described embodiments 1 to 3 are listed below. The modifications described below can be applied in appropriate combinations.

[0101] In the following, although the symbols used in embodiment 1 are applicable to any of the above embodiments 1 to 3, this is merely to simplify the description and is not intended to exclude application to embodiments 2 and 3.

[0102] In one modified example, the straight pipe of the piping member 10 is not limited to the first straight pipe section 31, but may be the vertical pipe 3 itself. In this case, the vertical pipe 3 may be made of a single pipe material.

[0103] In one modified example, the protruding member 6 does not necessarily have to be formed integrally and continuously with the straight pipe such as the first straight pipe section 31. The protruding member 6 may be formed separately from the straight pipe and then joined to each other. This allows for greater freedom in arranging the protruding member 6.

[0104] In one modified example, the number of protruding members 6 is not particularly limited. The piping member 10 may include one or more protruding members 6. At least one of the one or more protruding members 6 may have an asymmetrical shape or a symmetrical shape when viewed in the direction of the central axis of the straight pipe (e.g., the first straight pipe section 31). At least one of the one or more protruding members 6 may be formed integrally and continuously with the straight pipe (e.g., the first straight pipe section 31), or may be formed separately. The one or more protruding members 6 do not necessarily have to have the same shape and dimensions, and may have different shapes and dimensions. When there are multiple protruding members 6, the positions of the apexes 6e of the multiple protruding members 6 may be different in the direction of the central axis of the straight pipe.

[0105] In the above embodiment, the second bent pipe 52 and the first straight pipe section 31 are formed separately, but the second bent pipe 52 and the first straight pipe section 31 may be formed integrally. This also makes it possible to improve the flow rate while making the device more compact. In this case, the socket 521 may not be necessary in the second bent pipe 52. The mark 313 may also not be necessary in the first straight pipe section 31.

[0106] In one modified example, the protruding member 6 is provided for the purpose of reducing pressure loss in the second bent pipe 52, but this is not limiting, and the protruding member 6 may be provided for the purpose of reducing pressure loss in a joint other than the second bent pipe 52. For example, a joint for which it is desirable to take such pressure loss into consideration is a joint having a first socket and a second socket oriented in a different direction from the first socket. Examples of such a joint include an elbow like the second bent pipe 52, or a tee. A tee has first to third sockets oriented in different directions, and the flow path from the third socket merges with the flow path from the second socket and leads to the first socket. In a tee, a straight pipe is connected to the first socket.

[0107] In one variation, the first end 6 a of the protruding member 6 does not necessarily have to coincide with the corner 520 c of the second bent tube 52 .

[0108] In one modification, the shape and dimensions of the protruding member 6 are not limited to those in the above embodiment.

[0109] In one modified example, the shape and size of part or all of the piping system 1 may be different from those of the above embodiment. For example, unlike the above embodiment, in the piping system 1, the shape of the second bent pipe 52 and / or the shape of the vertical pipe 3 may be polygonal rather than circular.

[0110] In one variation, the material of each component of the piping system 1 does not necessarily have to be rigid polyvinyl chloride. The material of each component of the piping system 1 may be determined according to the requirements of the piping system 1, and may be, for example, a synthetic resin such as polyethylene. Furthermore, the material of each component of the piping system 1 may be a metal instead of a synthetic resin.

[0111] In one modification, the first straight pipe section 31 may not have the mark 313 .

[0112] In one modified example, the piping system 1 does not necessarily have to include the eaves gutter 2. For example, if the building 11 has a structure with an inlet (water collection port) such as a balcony, the first bent pipe 51 of the piping system 1 may be connected to the inlet (water collection port) of the building 11.

[0113] In one modified example, the drain 7 may have a structure that is generally not considered to contribute to the occurrence or promotion of the siphoning phenomenon. In one modified example, the piping system 1 does not necessarily have to include the drain 7. The drain 7 is not an essential component of the piping system 1, and may be provided as appropriate taking into consideration the installation environment of the piping system 1, etc.

[0114] [3. Aspects] As is apparent from the above-described embodiment and modifications, the present disclosure includes the following aspects.

[0115] [Aspect 1] a straight pipe disposed downstream of a joint having a first socket and a second socket oriented in a different direction from the first socket; one or more protruding members disposed within the straight pipe to partially reduce the flow path cross-sectional area of ​​the straight pipe; Equipped with The one or more protruding members are a first end and a second end in a longitudinal direction along a central axis of the straight pipe; a third end and a fourth end in a width direction perpendicular to the length direction; a top portion between the first end and the second end, which minimizes the cross-sectional area of ​​the flow path of the straight pipe; Equipped with When the angle between the third end and the fourth end with respect to the central axis of the straight pipe in a cross section perpendicular to the central axis of the straight pipe and passing through the top is θ, θ is 45° or more and 210° or less. Piping components.

[0116] [Aspect 2] θ is equal to or greater than 60° and equal to or less than 180°, The piping member of embodiment 1.

[0117] [Aspect 3] In the cross section, the shape of the surface of the protruding member between the third end and the fourth end is curved. The piping member according to aspect 1 or 2.

[0118] [Aspect 4] the one or more protruding members include a first protruding member and a second protruding member that face each other across a central axis of the straight pipe, When θ of the first protruding member is θ1, θ1 is equal to or greater than 45° and equal to or less than 210°, When θ of the second protruding member is θ2, θ2 is equal to or greater than 45° and equal to or less than 210°. The piping member according to any one of the first to third embodiments.

[0119] [Aspect 5] θ1 + θ2 is less than 360°, The piping member of embodiment 4.

[0120] [Aspect 6] At least one of the one or more protrusion members has an asymmetric shape when viewed from the direction of the central axis of the straight pipe. The piping member according to any one of the first to fifth embodiments.

[0121] [Aspect 7] At least one of the one or more protruding members is formed integrally and continuously with the straight pipe. The piping member according to any one of the first to sixth aspects.

[0122] [Aspect 8] When the maximum value of the flow path cross-sectional area is A and the minimum value of the flow path cross-sectional area is A1, (A-A1) / A≦0.5. The piping member according to any one of the first to seventh embodiments.

[0123] [Aspect 9] When the inner diameter of the straight pipe is d and the length of the one or more protrusion members is L, 0.5d≦L≦5.0d. The piping member according to any one of the first to eighth embodiments.

[0124] [Aspect 10] When the inner diameter of the straight pipe is d and the height of the top of the one or more protrusion members is H, 0.05d≦H≦0.40d; The piping member according to any one of the first to ninth embodiments.

[0125] The second to tenth aspects above are optional elements. [Industrial Applicability]

[0126] The present disclosure is applicable to a piping member, specifically to a piping member that partially reduces the flow path cross-sectional area of ​​a straight pipe. [Explanation of symbols]

[0127] 10, 10A, 10B Piping components 31 1st straight pipe section (straight pipe) 52 Second bent pipe (joint) 521 Underbit (1st underbit) 522 Underbite (second underbite) 6,6A Protruding parts 6-1 First protruding member (protruding member) 6-2 Second protruding member (protruding member) 6a 1st end 6b 2nd end 6c 3rd end 6d 4th end 6e top

Claims

1. a straight pipe disposed downstream of a joint having a first socket and a second socket oriented in a different direction from the first socket; one or more protruding members disposed within the straight pipe to partially reduce a flow path cross-sectional area of ​​the straight pipe; Equipped with The one or more protruding members are a first end and a second end in a length direction along a central axis of the straight pipe; a third end and a fourth end in a width direction perpendicular to the length direction; a top portion between the first end and the second end, which makes the flow path cross-sectional area of ​​the straight pipe the smallest; Equipped with When an angle between the third end and the fourth end with respect to the central axis of the straight pipe in a cross section perpendicular to the central axis of the straight pipe and passing through the top is defined as θ, θ is equal to or greater than 45° and equal to or less than 210°. Piping components.

2. θ is equal to or greater than 60° and equal to or less than 180°, The piping member according to claim 1.

3. In the cross section, the shape of the surface of the protruding member between the third end and the fourth end is curved. The piping member according to claim 1.

4. the one or more protruding members include a first protruding member and a second protruding member that face each other across a central axis of the straight pipe, When θ of the first protruding member is θ1, θ1 is equal to or greater than 45° and equal to or less than 210°, When θ of the second protrusion member is θ2, θ2 is equal to or greater than 45° and equal to or less than 210°. The piping member according to claim 1.

5. θ1+θ2 is less than 360°, The piping member according to claim 4.

6. At least one of the one or more protrusion members has an asymmetric shape when viewed from the direction of the central axis of the straight pipe. The piping member according to claim 1.

7. At least one of the one or more protruding members is formed integrally and continuously with the straight pipe. The piping member according to claim 1.

8. When the maximum value of the flow path cross-sectional area is A and the minimum value of the flow path cross-sectional area is A1, (A-A1) / A≦0.

5. The piping member according to claim 1.

9. When the inner diameter of the straight pipe is d and the length of the one or more protrusion members is L, 0.5d≦L≦5.0d. The piping member according to claim 1.

10. When the inner diameter of the straight pipe is d and the height of the top of the one or more protrusion members is H, 0.05d≦H≦0.40d; The piping member according to claim 1.

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