Piping structure

Abstract

To provide a piping structure capable of reducing a draining sound when siphon force is generated at an outflow portion of water discharged from a temporary storage tank.SOLUTION: A core member 70 of a piping structure 20 is disposed in an air supply connection part 61 so as to be extractable from an inspection opening 61B and constitutes an air supply flow passage space 72B. A cross sectional area of the air supply flow passage space 72B is smaller than a cross sectional area of the inspection opening 61B at a lower part of the air supply connection part 61. A cross sectional area of a single flow passage part 62 is smaller in a height direction toward downstream side from upstream side at a portion facing a branch joint 60. A curve surface 76 being convex on the branch joint 60 side is formed at least on a part of a temporary storage tank 30 side at the portion facing the branch joint 60. An angle between a tangent of the curve surface 76 and a horizontal direction becomes smaller downward in a vertical direction from upward in the vertical direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a piping structure. [Background technology]

[0002] The following Patent Document 1 describes a siphon drainage system that applies siphon force to wastewater discharged from a plumbing fixture and stored in a temporary storage tank to cause it to flow out. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2011-256557 Summary of the Invention [Problem to be solved by the invention]

[0004] In a siphon drainage system equipped with a temporary storage tank, as in Patent Document 1, when the siphon force is activated, a loud drainage noise is likely to occur in the part where the flow path area narrows (outflow part) as the wastewater flows from the temporary storage tank into the siphon drainage pipe.

[0005] In view of the above, an object of the present invention is to provide a piping structure that can reduce drainage noise when siphon force is activated in the outflow portion of drainage water from a temporary storage tank. [Means for solving the problem]

[0006] A piping structure according to a first aspect of the present disclosure includes a temporary storage tank that stores wastewater discharged from a plumbing fixture; an outlet section that branches the wastewater discharged from the temporary storage tank from a single flow path into multiple flow paths; a horizontal pipe that is connected downstream of the outlet section and laterally discharges the wastewater stored in the temporary storage tank from each of the multiple flow paths branched at the outlet section; a vertical pipe that generates a siphon force in the horizontal pipe by causing the wastewater from the horizontal pipe to flow downward; and a supply pipe that has an opening, is located above the outlet section, and has a lower end connected across the single flow path and the multiple flow paths, and supplies air to the horizontal pipe. and a core member that is arranged within the air supply section so that the air can be extracted from the opening and forms an air supply path, the cross-sectional area of ​​the air supply path being smaller than the cross-sectional area of ​​the opening at the bottom of the air supply section, the cross-sectional area of ​​the single flow path being smaller in the height direction from the upstream side to the downstream side in the portion facing the single flow path and the multiple flow paths, at least a portion of the portion facing the single flow path and the multiple flow paths on the temporary storage tank side is formed with a curved surface that is convex toward the temporary storage tank side, and the angle between the tangent of the curved surface and the horizontal direction becomes smaller as it goes from vertically upward to vertically downward.

[0007] In this piping structure, a core member that defines an air supply passage and reduces the flow path cross-sectional area of ​​a lower portion of the air supply section is disposed within the air supply section. Furthermore, at least a portion of the core member on the temporary storage tank side has a curved surface that forms a smaller angle with the horizontal as it moves vertically downward. This ensures the amount of wastewater discharged from the temporary storage tank while reducing noise during discharge caused by entrainment of air contained in the wastewater flowing out of the temporary storage tank.

[0008] A piping structure of a second aspect of the present disclosure is the piping structure described in the first aspect, wherein the curved surface of the core member is an arc-shaped curved surface in which the angle between the tangent and the horizontal direction decreases as the curved surface moves from vertically upward to vertically downward.

[0009] In this piping structure, the curved surface formed on the core member is an arc-shaped curved surface, and the resistance of the flow path for the wastewater flowing out of the temporary storage tank is smaller than when the curved surface is not arc-shaped. This makes it possible to further reduce noise during drainage caused by the entrainment of air contained in the wastewater flowing out of the temporary storage tank.

[0010] A piping structure of a third aspect of the present disclosure is a piping structure according to the first or second aspect, wherein the lower end of the core member is located vertically above the upper end of the single flow path and below 50% of the height dimension of the single flow path.

[0011] In this piping structure, the lower end of the core member is located below 50% of the height of the single flow path from the vertical top, which reduces the flow rate of the wastewater flowing through the single flow path while preventing the level of the wastewater stored in the temporary storage tank from dropping too low. This reduces the amount of air contained in the wastewater flowing out of the temporary storage tank. This further reduces the noise caused by air being entrained in the wastewater flowing out of the temporary storage tank.

[0012] A piping structure of a fourth aspect of the present disclosure is a piping structure described in any one of the first to third aspects, wherein the lower end of the core member is cut out in an area that overlaps with the horizontal pipe when viewed from the temporary storage tank side.

[0013] In this piping structure, the lower end of the core member is cut out in the area that overlaps with the horizontal pipe when viewed from the temporary storage tank side, so that wastewater that hits the core member can easily flow into the horizontal pipe. This reduces turbulence of the wastewater flow inside the air intake section. This further reduces noise during drainage caused by air entrainment in the wastewater flowing out of the temporary storage tank.

[0014] A piping structure of a fifth aspect of the present disclosure is the piping structure described in any one of the first to fourth aspects, further comprising an air vent pipe connected to the temporary storage tank and supplying air to the temporary storage tank, and an air supply pipe connecting the air supply section and the air vent pipe.

[0015] In this piping structure, the ventilation pipe connected to the temporary storage tank is connected to the air supply section, so that when the water level in the temporary storage tank is high, wastewater from the temporary storage tank can be discharged into the horizontal pipe via the air supply section.

[0016] A piping structure of a sixth aspect of the present disclosure is a piping structure described in any one of the first to fifth aspects, wherein the core member is cut out in an area that overlaps with the air supply pipe when viewed from the direction in which the air supply pipe extends.

[0017] In this piping structure, the core member is cut out in the area that overlaps with the air intake pipe when viewed from the direction of the air intake pipe, allowing air to easily flow from the air intake pipe into the air intake section. This reduces turbulence of the wastewater flow inside the air intake section, further reducing noise during drainage caused by air being entrained in the wastewater flowing out of the temporary storage tank. [Effects of the Invention]

[0018] According to the piping structure of the present invention, it is possible to reduce the drainage noise when a siphon force is activated in the outflow portion of the drainage from the temporary storage tank. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a side view showing a piping structure according to an embodiment of the present invention; [Figure 2] 1 is a perspective view showing a piping structure according to an embodiment of the present invention; [Figure 3] 1 is a perspective view showing the vicinity of a branch joint of a piping structure according to an embodiment of the present invention. [Figure 4] FIG. 4B is a cross-sectional view taken along line 4B-4B in FIG. 5. [Figure 5] FIG. 4 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 2 is a view of the core member according to the embodiment of the present invention as seen from the temporary storage tank. [Figure 7] FIG. 2 is a perspective view of a core member according to an embodiment of the present invention. [Figure 8]4B is a cross-sectional view of a piping structure according to a comparative example, taken along line 4B-4B in FIG. 5. [Figure 9] FIG. 10 is a diagram showing changes in noise during drainage in the piping structure of the example and the piping structure of the comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, a piping structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated by the same reference numerals in the various drawings are the same components. However, unless otherwise specified in the specification, each component is not limited to one, and may be present in multiple numbers.

[0021] Furthermore, the description of the same components and symbols in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and may be implemented by making appropriate modifications, such as omitting components or replacing them with different components, within the scope of the object of the present invention.

[0022] In the drawing, arrow Z indicates the vertical upward direction, and arrows X and Y indicate directions that are orthogonal to each other in the horizontal direction.

[0023] <Piping structure> (Siphon drainage system) 1 shows an outline of a piping structure 20 according to this embodiment. The piping structure 20 is a siphon drainage system structure that utilizes siphon force to discharge wastewater from a plumbing fixture 12. As an example, the piping structure 20 is used in an apartment building 10 that is constructed to have multiple floors.

[0024] The piping structure 20 is equipped with a drainage standpipe 22 that drains wastewater downward. The drainage standpipe 22 extends in the up-down direction (vertical direction) and penetrates the slab 14 of each floor of the apartment building 10. A plurality of drainage standpipes 22 are provided in different locations on the floor plan of the apartment building 10. The drainage standpipe 22 is housed, for example, in a piping space (also referred to as a pipe space, etc.) that is partitioned by walls from each dwelling on each floor of the apartment building 10.

[0025] Each dwelling unit in the apartment building 10 is provided with a plumbing fixture 12. The plumbing fixture 12 is, for example, a bathroom unit, and is formed by integrating a bathtub 12A and a washing area 12B. One end of a drainage inlet pipe 24 is connected to the plumbing fixture 12.

[0026] The other end of the wastewater inlet pipe 24 is connected to the temporary storage tank 30, which will be described later. As a result, the wastewater inlet pipe 24 introduces wastewater discharged from the bathtub 12A and the washing area 12B of the plumbing fixture 12 into the temporary storage tank 30. It is preferable that the wastewater inlet pipe 24 is arranged with a slope so that the temporary storage tank 30 side is lower.

[0027] The temporary storage tank 30 is capable of temporarily storing wastewater from the plumbing fixtures 12 and is formed in a substantially rectangular parallelepiped shape. An inlet section 30A is formed in one side wall of the temporary storage tank 30, and the other end of the wastewater introduction pipe 24 is connected to it. A protrusion 30B is formed in the lower part of the other side wall opposite the one side wall of the temporary storage tank 30. The inlet section 30A has a concave shape on the side where the wastewater introduction pipe 24 is connected.

[0028] A branch joint 60 serving as an outflow section, which will be described later, is connected to the protruding section 30B, and the siphon drain pipe 40 is connected via the branch joint 60. The protruding section 30B is convex and protrudes toward the side to which the branch joint 60 is connected, and an outflow opening 30C having a horizontally long slot shape is formed at the tip. The temporary storage tank 30 is formed from a resin material, for example, polyvinyl chloride or other such material.

[0029] An inspection hatch 32 is formed in the ceiling wall of the temporary storage tank 30, and the inspection hatch 32 is closed with a lid 34.

[0030] (Branch joint) 3 and 4, branch joint 60 has a single flow path section 62 and a multiple flow path section 64. Single flow path section 62 extends from protruding portion 30B, and within single flow path section 62, there are formed one single flow path 63A that is continuous with outflow opening 30C, and a single space 63B whose diameter is expanded from single flow path 63A in the horizontal direction perpendicular to single flow path 63A. Furthermore, single flow path section 62 is an example of a "single flow path" in the present disclosure.

[0031] Two multi-channel sections 64 protrude in parallel from the single channel section 62 in the same direction as the single channel section 62, and two branch channels 65 are formed inside the multi-channel section 64 and arranged parallel to each other along the outer shape of the multi-channel section 64. Each branch channel 65 is continuous with the single space 63B and is connected to a horizontal pipe 42, which will be described later. As shown in FIG. 5 , the inner diameter of the single channel 63A is larger than the inner diameter of the horizontal pipe 42, the lower end of the single channel 63A is positioned at approximately the same height as the lower end of the horizontal pipe 42, and the upper end of the single channel 63A is positioned higher than the upper end of the horizontal pipe 42. The multi-channel section 64 is an example of the "multiple channels" of the present disclosure.

[0032] An air supply connection 61 serving as an air supply section is formed at the top of the single passage section 62. In other words, the air supply connection 61 spans the single passage section 62 and the multiple passage section 64, and its lower end is connected to the branch joint 60. The air supply connection 61 is generally cylindrical, and a communication passage 61A is formed inside that communicates with the single space 63B from above. An inspection opening 61B is formed at the top end of the air supply connection 61, opening upward from the communication passage 61A. The inspection opening 61B is closed by a lid 61D. Furthermore, a connection opening 61C is formed at the upper side of the air supply connection 61, opening from the communication passage 61A toward the vent pipe 50. An air supply pipe 66 is connected to the connection opening 61C.

[0033] (Siphon drain pipe) As shown in Figure 2, the siphon drain pipe 40 includes multiple (two in this embodiment) horizontal pipes 42 arranged along the slab 14, a confluence horizontal pipe 44, a vertical pipe 46, and a horizontal confluence joint member 48.

[0034] The horizontal drain pipe 42 discharges wastewater discharged from the plumbing fixtures 12 horizontally through multiple flow paths. The horizontal drain pipe 42 is formed, for example, from a polybutylene pipe with a nominal diameter of 25J (inner diameter of approximately 28 mm), and is arranged without a gradient along the horizontal direction on the slab 14. Note that "without a gradient" here does not necessarily have to be strictly horizontal, and also includes a slight step or gradient along the slab 14.

[0035] The "upstream" ends of the two horizontal pipes 42 are connected to the branch flow paths 65 of the branch joint 60. The "downstream" ends of the two horizontal pipes 42 are connected to one confluent horizontal pipe 44 via a horizontal confluent joint member 48. The confluent horizontal pipe 44 is a horizontal pipe that discharges wastewater introduced from the two horizontal pipes 42 in a horizontal direction. The confluent horizontal pipe 44 and the horizontal confluent joint member 48 may be integrally configured.

[0036] The total cross-sectional area of ​​the two horizontal pipes 42 is preferably less than the cross-sectional area of ​​the wastewater inlet pipe 24. In addition, the cross-sectional area of ​​the confluence horizontal pipe 44 is preferably less than the total cross-sectional area of ​​the two horizontal pipes 42. The cross-sectional areas of the confluence horizontal pipe 44 and the horizontal pipe 42 are set in consideration of the amount of wastewater discharged from the wastewater inlet pipe 24 so that the wastewater flows through the pipes at full flow as necessary.

[0037] As shown in Figures 1 and 2, a confluence horizontal pipe 44 is connected to the upstream side of the standpipe 46. The standpipe 46 is arranged in the up-down direction (vertical direction) along the drainage standpipe 22, and generates a siphon force in the horizontal pipe 42. The other end of the standpipe 46 is connected to a confluence joint 26. The confluence joint 26 is a joint member that merges the drainage water from the standpipe 46 into the drainage standpipe 22.

[0038] The confluence horizontal pipe 44 and the vertical pipe 46 are configured as a single continuous path without merging with other drainage pipes up to the confluence joint 26, and direct the drainage water to the drainage standpipe 22. Note that the connection between the confluence horizontal pipe 44 and the vertical pipe 46 is illustrated as a continuous vent pipe, but a coupling member such as an elbow may be placed in this vent pipe section. When a coupling member is placed, an inspection hatch or the like may be provided in the coupling member as appropriate.

[0039] As shown in FIG. 2, a vent pipe 50 is connected to the temporary storage tank 30. One end of the vent pipe 50 is connected to the upper part of the side wall of the temporary storage tank 30 where the protruding portion 30B is formed, and extends approximately parallel to the horizontal pipe 42. The other end of the vent pipe 50 is connected to the junction joint 26. A connection port 67B on the other end of the air supply pipe 66 is connected to a portion of the vent pipe 50 close to the temporary storage tank 30. The air supply pipe 66 is connected to the drainage standpipe 22 via the junction joint 26. Air flows in and out of the temporary storage tank 30 through the vent pipe 50 so that the pressure inside the temporary storage tank 30 becomes atmospheric pressure. Air is also supplied from the vent pipe 50 to the horizontal pipe 42 via the air supply pipe 66.

[0040] (Core material) A core member 70 is disposed within the air supply connection 61. As shown in Figure 7, the core member 70 is generally cylindrical and has a main body 72 and a locking portion 74. The locking portion 74 is annular, constitutes the upper end of the core member 70, and is locked to the inner circumferential wall that forms the inspection opening 61B of the air supply connection 61. The core member 70 can be removed from the inspection opening 61B into the communicating flow path 61A within the air supply connection 61.

[0041] The main body 72 extends downward from the locking portion 74 and is disposed in the communication flow path 61A. An air intake inlet space 72A and an air intake flow path space 72B, which serve as examples of air intake paths, are formed on the side surface of the main body 72. As shown in FIG. 4, the air intake inlet space 72A may be formed by cutting out the main body 72 so that it is concave at a position where it overlaps with the air intake connection portion 61 when viewed from the side (the horizontal direction perpendicular to the direction in which the wastewater flows). The air intake flow path space 72B is formed by cutting out a semicircular shape closer to the horizontal pipe 42 than the center, on the side of the horizontal pipe 42 rotated 90° from the air intake inlet space 72A when viewed from above, so that the main body 72 is concave. The air intake inlet space 72A is formed in the vertical direction (Z direction) at a height corresponding to the connection opening 61C, and the air intake flow path space 72B is formed in the vertical direction (Z direction) from the same position as the upper end of the air intake inlet space 72A to the lower end, and may be connected to the air intake inlet space 72A.

[0042] The side of the main body 72 where the air intake inlet space 72A and the air intake flow path space 72B are not formed is shaped to follow the inner wall of the air intake connection part 61. As shown in Fig. 5, the part of the main body 72 facing the single flow path part 62 and the multiple flow path part 64 has a curved surface 76 that is curved obliquely downward from the upstream side (upper end) of the single flow path 63 of the branch joint 60 to the downstream side (upper end of the branch flow path 65). In other words, the part of the main body 72 facing the outlet part is formed so that the cross-sectional area of ​​the single flow path part 62 decreases in the height direction from the upstream side to the downstream side. Note that this curved surface 76 may be an arcuate surface whose angle between a tangent line and the horizontal direction decreases from the vertically upper side to the vertically lower side.

[0043] 5, the curved surface 76 is convex toward the upstream side of the single-passage section 62, and the angle formed by the tangent of the curved surface 76 and the horizontal direction decreases from the upper side to the lower side in the vertical direction. In other words, the curved surface 76 is formed so that the outline of the curved surface 76 is curved when the core member 70 is viewed from the side.

[0044] With the core member 70 disposed in the communicating flow path 61A, the main body 72 is disposed on the upstream side (left side in FIG. 5) in the direction of the wastewater flow inside the air intake connection 61. Therefore, the cross-sectional area of ​​the air intake flow path space 72B, which is the portion of the lower part of the communicating flow path 61A through which air flows, is smaller than the opening area of ​​the inspection opening 61B. In this embodiment, the cross-sectional area of ​​the lower end of the communicating flow path 61A is the opening area of ​​the air intake flow path space 72B to the single flow path 63, and is the opening S.

[0045] 5 and 6, the lower end 76E of the core member 70 may be located below 50% of the height of the single flow path 63 from the vertically upper end of the single flow path 63. In other words, when wastewater flows through the single flow path section 62, the lower end 76E of the core member 70 may be shaped to be immersed in the wastewater.

[0046] Furthermore, when viewed from the temporary storage tank 30 side, the lower end of the core member 70 has a portion that overlaps with the multi-passage section 64 cut out along the inner diameter 78 of the multi-passage section 64. In other words, when viewed from the temporary storage tank 30 side, the lower end of the core member 70 may be shaped so as not to overlap with the multi-passage section 64.

[0047] A connection port 67A at one end of the air supply pipe 66 is connected to the connection opening 61C. A connection port 67B at the other end of the air supply pipe 66 is connected to the ventilation pipe 50.

[0048] <Action and effect> Next, the operation and effects of the piping structure 20 of this embodiment will be described.

[0049] The piping structure 20 of the embodiment includes a temporary storage tank 30 that stores wastewater discharged from a plumbing fixture 12, a branch joint 60 that branches the wastewater discharged from the temporary storage tank 30 from a single-flow path section 62 to a multiple-flow path section 64, a horizontal pipe 42 that is connected to the downstream side of the branch joint 60 and discharges the wastewater stored in the temporary storage tank 30 laterally from each of the branch paths 65 branched by the branch joint 60, a vertical pipe 46 that generates a siphon force in the horizontal pipe 42 by causing the wastewater from the horizontal pipe 42 to flow downward, an air supply connection section 61 that has an inspection opening 61B and is located above the branch joint 60, and whose lower end is connected across the single-flow path section 62 and the multiple-flow path section 64 and supplies air to the horizontal pipe 42, and The core member 70 is arranged within the air intake connection portion 61 so as to be removable from the inspection opening 61B, forming an air intake inlet space 72A and an air intake flow path space 72B, the cross-sectional areas of the air intake inlet space 72A and the air intake flow path space 72B at the bottom of the air intake connection portion 61 being smaller than the cross-sectional area of ​​the inspection opening 61B, the cross-sectional area of ​​the single flow path portion 62 in the portion facing the branch fitting 60 is reduced in the height direction from the upstream side to the downstream side, and a curved surface 76 that is convex toward the temporary storage tank 30 is formed on at least a part of the temporary storage tank 30 side in the portion facing the single flow path portion 62 and the double flow path portion 64, and the angle between the tangent of the curved surface 76 and the horizontal direction becomes smaller as it moves vertically from above to below.

[0050] In this piping structure 20, a core member 70 that defines an air supply inlet space 72A and an air supply flow path space 72B and reduces the flow path cross-sectional area at the bottom of the air supply connection part 61 is disposed within the air supply connection part 61. Furthermore, at least a portion of the core member 70 on the temporary storage tank 30 side is formed with a curved surface 76 that forms a smaller angle with the horizontal direction as it goes from the upper vertical direction to the lower vertical direction. This makes it possible to ensure the amount of wastewater flowing out of the temporary storage tank 30, while reducing noise during drainage caused by the entrainment of air contained in the wastewater flowing out of the temporary storage tank 30.

[0051] In the piping structure 20 of the embodiment, the curved surface 76 of the core member 70 is an arcuate curved surface in which the angle formed by the tangent line and the horizontal direction decreases from the vertically upper side to the vertically lower side.

[0052] In this piping structure 20, the curved surface 76 formed on the core member 70 is an arc-shaped curved surface, and the resistance of the flow path through which the wastewater flowing out of the temporary storage tank 30 flows is smaller than when the curved surface 76 is not arc-shaped. This makes it possible to further reduce noise during drainage caused by the entrainment of air contained in the wastewater flowing out of the temporary storage tank 30.

[0053] In the piping structure 20 of the embodiment, the lower end of the core member 70 is located below 50% of the height of the single passage section 62 from above the upper end of the single passage section 62 in the vertical direction.

[0054] In this piping structure 20, the lower end of the core member 70 is located below 50% of the height of the flow path from the vertically upper side of the flow path of the single flow path section 62, so that the flow rate of the wastewater flowing through the single flow path section 62 is reduced while the water level of the wastewater stored in the temporary storage tank 30 does not drop too much. This reduces the amount of air contained in the wastewater flowing out from the temporary storage tank 30. This makes it possible to further reduce noise during drainage caused by the entrainment of air contained in the wastewater flowing out from the temporary storage tank 30.

[0055] In the piping structure 20 of the embodiment, the lower end of the core member 70 is cut out in an area that overlaps with the multi-flow path portion 64 when viewed from the temporary storage tank 30 side.

[0056] In this piping structure 20, the lower end of the core member 70 is cut out in an area that overlaps with the multi-flow path section 64 when viewed from the temporary storage tank 30 side, so that the wastewater that hits the core member 70 can easily flow into the horizontal pipe 42. This reduces turbulence of the wastewater flow inside the air supply connection section 61. This further reduces noise during drainage caused by the entrainment of air contained in the wastewater flowing out of the temporary storage tank 30.

[0057] The piping structure 20 of the embodiment further includes an air vent pipe 50 connected to the temporary storage tank 30 to supply air to the temporary storage tank 30, and an air supply pipe 66 connecting the air supply connection part 61 and the air vent pipe 50.

[0058] In this piping structure 20, the ventilation pipe 50 connected to the temporary storage tank 30 is connected to the air supply connection part 61, so that when the water level in the temporary storage tank 30 is high, wastewater from the temporary storage tank 30 can be discharged into the horizontal pipe 42 via the air supply connection part 61.

[0059] In the piping structure 20 of the embodiment, the core member 70 is cut out in a range that overlaps with the air supply pipe 66 when viewed from the direction in which the air supply pipe 66 extends.

[0060] In this piping structure 20, the core member 70 is cut out in an area that overlaps with the air supply pipe 66 when viewed from the direction in which the air supply pipe 66 extends, so that air can easily flow from the air supply pipe 66 into the air supply connection part 61. This reduces turbulence in the flow of wastewater inside the air supply connection part 61. This further reduces noise during drainage caused by the entrainment of air contained in the wastewater flowing out from the temporary storage tank 30.

[0061] (Example) Next, the results of comparing the core member 70 according to this embodiment with the core member 170 of the comparative example will be shown with appropriate reference to FIGS. 8 and 9. FIG.

[0062] (Core member for comparative example) First, a core member 170 of a comparative example will be described in comparison with the core member 70 of the example. Note that in the core member 170 of the comparative example, the same reference numerals are used for the same components as those of the piping structure 20 of the embodiment and the core member 70 of the piping structure 20 of the embodiment, and detailed descriptions thereof will be omitted.

[0063] FIG. 8 is a diagram showing a core member 170 of the comparative example, corresponding to FIG. 4 . The core member 170 of the comparative example differs from the core member 70 of the embodiment in that the curved surface 76 is replaced with a flat surface 176. As shown in FIG. 8 , the flat surface 176 of the core member 170 of the comparative example does not decrease in angle between the tangent of the flat surface 176 and the horizontal direction as it moves vertically downward. In other words, the flat surface 176 is formed so that the outline of the core member 70 is a straight line when viewed from the side. Furthermore, the position of the lower end 176E of the core member 170 is the same as the lower end 76E of the core member 70 of the first embodiment. That is, similar to the core member 70 of the first embodiment, the lower end 76E of the core member 70 is shaped to be immersed in wastewater when wastewater flows through the single-passage section 62.

[0064] The shape of the other parts of the core member 170 of the comparative example is the same as that of the core member 70 of the embodiment.

[0065] 9 shows the results of a comparison of noise generated when siphon force is activated between the core member 70 of the example and the core member 170 of the comparative example. Note that "example" in the drawing refers to the core member 70 according to the embodiment described above.

[0066] 9, immediately after the siphon force is activated, that is, when the water level in the temporary storage tank 30 is high (the "high water level" period in the figure), both the example and the comparative example produce a large amount of noise. Furthermore, when the wastewater flows out of the temporary storage tank 30 and the water level in the temporary storage tank 30 is medium (the "medium water level" period in the figure), both the example and the comparative example produce a smaller amount of noise than when the water level in the temporary storage tank 30 is high.

[0067] Here, when the water level in the temporary storage tank 30 drops (the "low water level" period in the figure), the noise level increases again in the comparative example, whereas the increase in noise is suppressed in the example. In other words, the average values ​​of the audibility and sound pressure are smaller in the example than in the comparative example.

[0068] The reason why the increase in noise was suppressed when the water level in the temporary storage tank 30 dropped in this manner in the example is presumed to be as follows.

[0069] First, when the water level in the temporary storage tank 30 drops, the air in the temporary storage tank 30 flows from the temporary storage tank 30 to the branch joint 60 while being entrained in the wastewater.

[0070] Here, in the core member 170 of the comparative example, the portion facing the single flow path section 62 is a flat surface 176, and therefore noise is generated by disrupting the flow of wastewater containing air flowing out of the temporary storage tank 30, which hits the flat surface 176.

[0071] On the other hand, in the core member 70 of the embodiment, the portion facing the single flow path section 62 is a curved surface 76, so the flow of wastewater containing air flowing out from the temporary storage tank 30 that hits the curved surface 76 is less likely to be disturbed, and an increase in noise is suppressed.

[0072] (Variation) In the above description, the curved surface 76 of the core member 70 is formed in an arc shape over the entire portion facing the branch joint 60, but this is not limited to this. For example, it is sufficient that at least a portion of the portion of the core member 70 facing the branch joint 60 is formed with a curved surface 76 that is convex toward the branch joint 60, and the angle between the tangent to the curved surface 76 and the horizontal direction decreases from the upper vertical direction to the lower vertical direction. Even in this case, it is possible to ensure the amount of wastewater flowing out of the temporary storage tank 30, while reducing noise during drainage caused by the entrainment of air contained in the wastewater flowing out of the temporary storage tank 30.

[0073] In the above description, the curved surface 76 of the core member 70 is an arc-shaped curved surface in which the angle between the tangent and the horizontal direction decreases from the top vertically to the bottom vertically, but this is not limited to this. The shape of the curved surface 76 may be an exponential, logarithmic, or other suitable shape in addition to an arc-shaped curved surface, and may be designed appropriately to match the shape of the piping structure 20 in which the core member 70 is used.

[0074] In addition, in the above description, the lower end 76E of the core member 70 is located below 50% of the height of the single passage section 62 from the vertically upper end of the single passage section 62, but this is not limited to this. The lower end 76E of the core member 70 may be designed appropriately depending on the amount of wastewater flowing through the single passage section 62, the shape of the single passage section 62, etc.

[0075] In addition, in the above description, the lower end of the core member 70 is cut out in the area that overlaps with the horizontal pipe 42 when viewed from the temporary storage tank 30 side, but this is not limited to this. The shape of the lower end of the core member 70 may be designed appropriately depending on the amount of wastewater flowing through the single flow path section 62, the shape of the single flow path section 62, etc.

[0076] Furthermore, in the above description, the piping structure 20 is connected to the temporary storage tank 30 and includes the vent pipe 50 that supplies air to the temporary storage tank 30, and the air supply pipe 66 that connects the air supply unit and the vent pipe 50, but this is not limited to this. For example, the piping structure 20 may be configured without the vent pipe 50 that supplies air to the temporary storage tank 30 and the air supply pipe 66 that connects the air supply unit and the vent pipe 50.

[0077] In the above description, the core member 70 is cut out in the area that overlaps with the air supply pipe 66 when viewed from the direction in which the air supply pipe 66 extends, but this is not limited to this. The core member 70 may be designed as appropriate depending on the amount of air flowing through the air supply pipe 66, the shapes of the air supply inlet space 72A and the air supply flow path space 72B, etc.

[0078] In the above description, the core member 70 is cut out in the area that overlaps with the air supply pipe 66 when viewed from the direction in which the air supply pipe 66 extends, but this is not limited to this. The core member 70 may be designed as appropriate depending on the amount of air flowing through the air supply pipe 66, the shapes of the air supply inlet space 72A and the air supply flow path space 72B, etc.

[0079] (Other embodiments) In the above embodiment, the branch joint 60 has been described as having a shape in which the single flow path 63A and the branch flow path 65 are arranged in parallel, but a Y-shaped branch joint or a T-shaped branch joint (a direct current flow path and a shape branching diagonally from the direct current flow path) may also be used as the branch joint.

[0080] The above describes an embodiment of the present disclosure with reference to the accompanying drawings. However, it is clear that a person with ordinary knowledge in the field of technology to which the present disclosure pertains can conceive of various modifications or applications within the scope of the technical ideas set forth in the claims, and it is understood that these also naturally fall within the technical scope of the present disclosure. [Explanation of symbols]

[0081] 12 Plumbing fixtures, 20 Piping structure, 30 Temporary storage tank 42 horizontal pipe, 46 vertical pipe, 50 ventilation pipe, 60 branch joint (outlet section) 61 air supply connection part (air supply part), 61A communication flow path, 61B inspection opening (opening) 62 single flow passage portion (single flow passage), 64 double flow passage portion (multiple flow passages), 66 air supply pipe (air supply portion), 70 core member, 72A air supply inlet space (air supply passage), 72B air supply passage space (air supply passage), 76 curved surface

Claims

1. a temporary storage tank for storing wastewater discharged from plumbing fixtures; an outflow section that branches the wastewater discharged from the temporary storage tank from a single flow path into multiple flow paths; a horizontal pipe connected to the downstream side of the outflow section and discharging the wastewater stored in the temporary storage tank in a horizontal direction from each of the multiple flow paths branched at the outflow section; a vertical pipe that generates a siphon force in the horizontal pipe by causing the drainage water from the horizontal pipe to flow downward; an air supply section having an opening, located above the outflow section, and connected at its lower end across the single flow path and the multiple flow paths, for supplying air to the horizontal drawing pipe; a core member that is disposed within the air supply section to be able to extract air from the opening and that forms an air supply passage, the cross-sectional area of ​​the air supply passage at a lower part of the air supply section being smaller than the cross-sectional area of ​​the opening, the cross-sectional area of ​​the single passage decreasing in height direction from the upstream side to the downstream side in the portion facing the single passage and the multiple passages, the cross-sectional area of ​​the single passage decreasing in height direction from the upstream side to the downstream side, and the core member that is formed with a curved surface that is convex toward the temporary storage tank in at least a part of the portion facing the single passage and the multiple passages on the temporary storage tank side, the angle that the tangent of the curved surface makes with the horizontal direction decreasing from the vertically upper side to the vertically lower side; A piping structure equipped with:

2. The curved surface of the core member is an arcuate curved surface in which the angle formed by the tangent line and the horizontal direction decreases from a vertically upper position to a vertically lower position. The piping structure according to claim 1 .

3. The lower end of the core member is located below 50% of the height dimension of the single flow path from a vertical position above the upper end of the single flow path. The piping structure according to claim 1 .

4. A range of the lower end of the core member that overlaps with the plurality of flow paths when viewed from the temporary storage tank side is cut out. The piping structure according to claim 1 .

5. an air vent pipe connected to the temporary storage tank and supplying air to the temporary storage tank; an air supply pipe connecting the air supply unit and the ventilation pipe; The piping structure according to any one of claims 1 to 4, further comprising:

6. The core member is cut out in an area that overlaps with the air intake pipe when viewed from the direction in which the air intake pipe extends. The piping structure according to claim 5 .

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