Piping construction

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 72. A cross sectional area of the air supply flow passage space 72 is smaller than a cross sectional area of the inspection opening 61B at a lower part of the air supply connection part 61. An area on a single flow passage 63A side in a top view is 80% or less of an area of the air supply connection part 61 in a top view.SELECTED DRAWING: Figure 6

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] The piping structure of the first aspect 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 to the downstream side 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 passage that is connected to the temporary storage tank and supplies air to the temporary storage tank. The air supply pipe comprises an air tube, an air supply section having an opening, located above the outlet section, and having a lower end connected across the single flow path and the multiple flow paths, and supplying air to the horizontal pipe; an air supply pipe connecting the air supply section and the ventilation pipe; and a core member arranged within the air supply section so as to be extractable from the opening, forming an air supply path, the cross-sectional area of ​​the air supply path at the bottom of the air supply section being smaller than the cross-sectional area of ​​the opening, and the temporary storage tank side when viewed from above being 80% or less of the area of ​​the air supply section when viewed from above.

[0007] In this piping structure, a core member that forms the air intake passage and reduces the cross-sectional area of ​​the flow path at the bottom of the air intake section is placed inside the air intake section, and the air intake section is connected to the temporary storage tank through an air intake pipe and a vent pipe. Furthermore, the area of ​​the core member on the horizontal pipe side, when viewed from above, is set to 80% or less of the area of ​​the air intake section. This ensures the amount of wastewater discharged from the temporary storage tank while also facilitating the flow of air from the air intake pipe to the horizontal pipe, thereby reducing noise during drainage.

[0008] The piping structure of the second aspect is the piping structure described in the first aspect, wherein the core member is formed by cutting out an arc along the inner surface of the air supply section on the side of the horizontal pipe in a top view.

[0009] In this piping structure, the side of the core member facing the horizontal pipe is cut out in an arc shape along the inner surface of the air supply section, so that air supplied from the ventilation pipe can be smoothly supplied to the horizontal pipe.

[0010] The piping structure of the third aspect is the piping structure described in the first or second aspect, wherein the core member has an area on the single flow path side when viewed from above that is 50% of the area of ​​the air supply section when viewed from above.

[0011] In this piping structure, the area of ​​the horizontal pipe side of the core member is less than 50% of the area of ​​the air supply section, so that air supplied from the ventilation pipe can be smoothly supplied to the horizontal pipe.

[0012] A piping structure of a fourth aspect is a piping structure described in any one of the first to third aspects, wherein the lower end of the core member is located below 50% of the height dimension of the single flow path from vertically above the upper end of the single flow path.

[0013] In this piping structure, the lower end of the core member is located below 50% of the height of the effluent flow path from the vertical top. This reduces the flow rate of the wastewater flowing through the flow path while preventing the water level 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. [Effects of the Invention]

[0014] 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]

[0015] [Figure 1] 1 is a side view showing a piping structure according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view showing a piping structure according to a first 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 a first 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 perspective view of a core member according to the first embodiment of the present invention. [Figure 7] 4B is a cross-sectional view of a piping structure according to a second embodiment of the present invention, taken along line 4B-4B in FIG. 5. [Figure 8] 4 is a cross-sectional view of a piping structure according to a second embodiment of the present invention, taken along line AA in FIG. 3. FIG. [Figure 9] FIG. 10 is a perspective view of a core member according to a second embodiment of the present invention. [Figure 10] 4B is a cross-sectional view of a piping structure according to a comparative example, taken along line 4B-4B in FIG. 5. [Figure 11] FIG. 10 is a perspective view of a core member according to a comparative example. [Figure 12] 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

[0016] 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.

[0017] 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.

[0018] 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.

[0019] [First embodiment] <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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] (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.

[0027] 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.

[0028] 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.

[0029] (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.

[0030] 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.

[0031] 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 junction horizontal pipe 44 via a horizontal junction joint member 48. The junction horizontal pipe 44 is connected to the two horizontal pipes 4 2. The confluence horizontal pipe 44 and the horizontal confluence joint member 48 may be integrally formed.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] (Core material) A core member 70 is disposed within the air supply connection 61. As shown in Fig. 6, 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.

[0037] The main body 72 extends downward from the locking portion 74 and is disposed in the communicating 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 a notch at a position corresponding to the air intake connection portion 61 when viewed from the side, so that the main body 72 is concave. The air intake flow path space 72B may be formed by cutting out an arc-shaped notch along the inner surface of the air intake portion on the horizontal pipe 42 side, rotated 90 degrees from the air intake inlet space 72A, 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.

[0038] 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 Figure 5, the part of the main body 72 facing the outlet part has a flat surface 76 formed 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). Here, the "upper end" can also be referred to as the "ceiling part" of each flow path. The "flat surface" can also be referred to as the "sloped drainage surface" or the "sloped ceiling surface."

[0039] When the core member 70 is disposed in the communicating passage 61A, the main body 72 is disposed on the upstream side (left side in FIG. 5) in the direction of the drainage water flow inside the air intake connection portion 61. Therefore, the cross-sectional area of ​​the air intake passage space 72B, which is the portion through which air flows at the bottom of the communicating passage 61A, is smaller than the opening area of ​​the inspection opening 61B. In this embodiment, the cross-sectional area of ​​the air intake passage space 72B is 80% or less of the opening area of ​​the inspection opening 61B. In other words, the main body 72 is cut away on the side of the horizontal pipe 42 in a top view by 20% or more of the area of ​​the inspection opening 61B when viewed from above. In this embodiment, the cross-sectional area of ​​the lower end of the communicating passage 61A is the opening area of ​​the air intake passage space 72B to the single passage 63, which is the opening S.

[0040] 5, 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.

[0041] 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.

[0042] <Action and effect> Next, the operation and effects of the piping structure 20 of this embodiment will be described.

[0043] The piping structure 20 of this 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 and then to a branch flow path 65, a horizontal draw 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 flow paths 65, a vertical pipe 46 that generates a siphon force in the horizontal draw pipe 42 by causing the wastewater from the horizontal draw pipe 42 to flow downward, a vent pipe 50 that is connected to the temporary storage tank 30 and supplies air to the temporary storage tank 30, and an inspection opening 61B. and an air intake connection part 61 located above 60, having its lower end connected across the single flow path 63 and the branch flow path 65, and supplying air to the horizontal pipe 42; an air intake pipe 66 connecting the air intake connection part 61 and the ventilation pipe 50; and a core member 70 arranged within the air intake connection part 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 part 61 being smaller than the cross-sectional area of ​​the inspection opening 61B, and the area on the single flow path 63 side when viewed from above being 80% or less of the area of ​​the air intake connection part 61 when viewed from above.

[0044] 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 of ​​the lower part of the air supply connection part 61 is disposed in the air supply connection part 61, and the air supply connection part 61 is connected to the temporary storage tank 30 through an air supply pipe 66 and a vent pipe 50. The temporary storage tank 30 of the air supply connection part 61 side Block the , and 80% or less of the area of ​​the air supply connection part 61 Block This ensures the amount of wastewater discharged from the temporary storage tank 30 while also facilitating the flow of air from the air supply pipe 66 to the horizontal pipe 42, thereby reducing noise during drainage.

[0045] Furthermore, the core member 70 of this embodiment is formed by cutting out an arc along the inner surface of the air supply connection portion 61 on the side of the horizontal drawing pipe 42 in the core member 70 when viewed from above.

[0046] In this piping structure 20, the side of the core member 70 facing the horizontal pipe 42 is cut out in an arc shape along the inner surface of the air supply connection portion 61, so that air supplied from the ventilation pipe 50 can be smoothly supplied to the horizontal pipe 42.

[0047] Furthermore, the lower end of the core member 70 in this embodiment is located below 50% of the height dimension of the single flow path 63 from above the upper end of the single flow path 63 in the vertical direction.

[0048] 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 vertical top of the effluent flow path, so the flow rate of the wastewater flowing through the flow path 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.

[0049] [Second embodiment] Next, a second embodiment of the piping structure according to the present disclosure will be described with appropriate reference to Figures 7 to 9. Note that, in the core member 170 of the second embodiment, the same components as those of the piping structure 20 and the core member 70 of the first embodiment will be denoted by the same reference numerals, and detailed description thereof will be omitted.

[0050] 7 to 9, in the core member 170 according to the second embodiment, the main body 72 may be formed with a semicircular cutout on the side closer to the horizontal pipe 42 than the center. In other words, in the core member 170 according to the present embodiment, the area on the side of the single flow path 63 in top view may be 50% of the area of ​​the air supply connection part 61 in top view.

[0051] 8, the lower end 176E of the core member 170 may be located lower than 50% of the height of the single flow path 63 from the vertically upper end of the single flow path 63, as in the first embodiment. Furthermore, the flat surface 176 has a larger angle with the horizontal direction than the flat surface 76 of the core member 70 of the first embodiment, and the lower end 176E may have a larger width in the horizontal direction.

[0052] The shape of the other parts of the core member 170 of the second embodiment is the same as that of the core member 70 of the first embodiment.

[0053] <Action and effect> Next, the operation and effects of this embodiment will be described.

[0054] In the core member 170 in this embodiment, the area on the single flow path 63 side when viewed from above is 50% of the area of ​​the air supply connection portion 61 when viewed from above.

[0055] In this embodiment, the area of ​​the horizontal pipe 42 side of the core member 170 is less than 50% of the area of ​​the air supply connection portion 61, so that the air supplied from the ventilation pipe 50 can be supplied to the horizontal pipe 42 more smoothly than when the area of ​​the air supply connection portion 61 on the horizontal pipe 42 side of the core member 170 is less than 50%.

[0056] Other functions and effects are similar to those of the piping structure 20 of the first embodiment.

[0057] (Example) Next, the results of a comparison between the core member 70 according to the first embodiment, the core member 170 according to the second embodiment, and the core member 270 of the comparative example will be described with reference to FIGS. 10 to 12 as appropriate.

[0058] (Core member for comparative example) First, a description will be given of a core member 270 of a comparative example. Note that, in the core member 270 of the comparative example, the same components as those of the core member 70 of Example 1 or the core member 170 of Example 2 will be designated by the same reference numerals, and detailed description thereof will be omitted.

[0059] 10 and 11 are diagrams showing a piping structure 20 in which a core member 270 of the comparative example is used. The core member 270 of the comparative example differs from the core member 70 of Example 1 in that a main body portion 272 below the air intake inlet space 72A is cut out in a concave shape from the horizontal pipe 42 side toward the single flow path 63 side. As shown in Figs. 10 and 11, the cross-sectional area of ​​the air intake flow path space 272B of the core member 270 of the comparative example is 9.5% of the opening area of ​​the inspection opening 61B.

[0060] The shape of the flat surface 276 of the core member 270 is the same as the shape of the flat surface 76 of the core member 70 of the first embodiment. That is, the lower end 276E is located below 50% of the height dimension of the single flow path 63 from the vertically above the upper end of the single flow path 63, as in the first embodiment.

[0061] The shape of other parts of the core member 270 of the comparative example is the same as that of the core member 70 of the first embodiment or the core member 170 of the second embodiment.

[0062] 12 shows the comparison results of noise when wastewater flows through the piping structure 20 using the core member 70 of Example 1, the core member 170 of Example 2, and the core member 270 of the comparative example. Note that "Example 1" in the figure refers to the core member 70 according to the first embodiment described above, and "Example 2" refers to the core member 170 according to the second embodiment described above.

[0063] As shown in Fig. 12, after the siphon force is activated by the wastewater flowing from the temporary storage tank 30 through the horizontal pipe 42 into the upright pipe 46, noise is generated in each of Example 1, Example 2, and the comparative example. However, as shown in Fig. 12, the maximum value of the noise intensity is smaller in Example 1 and Example 2 than in the comparative example, and furthermore, the maximum value of the noise intensity is smaller in Example 2 than in Example 1. In other words, the average values ​​of the audibility and sound pressure are smaller in Example 1 and Example 2 than in the comparative example.

[0064] The reason why the maximum noise value was reduced when core member 70 of Example 1 and core member 170 of Example 2 were used compared to when core member 270 of the comparative example was used is presumed to be as follows.

[0065] First, when the water level in temporary storage tank 30 drops, the air in temporary storage tank 30 is entrained together with the wastewater and flows out to branch joint 60. This wastewater containing air flowing out of temporary storage tank 30 hits flat surface 276 of core member 270, disrupting the flow of the wastewater and generating noise.

[0066] Here, the cross-sectional area of ​​the air supply passage space 72B in Example 1 and the cross-sectional area of ​​the air supply passage space 172B in Example 2 are larger than the cross-sectional area of ​​the air supply passage space 272B in the comparative example, so that the air supplied from the air supply pipe 66 easily flows toward the horizontal pipe 42. As a result, it becomes difficult for the air-containing wastewater flowing out of the temporary storage tank 30 to pass through the single passage 63, thereby reducing noise.

[0067] Furthermore, since the cross-sectional area of ​​the air supply passage space 172B in the second embodiment is larger than that of the air supply passage space 72B in the first embodiment, the air supplied from the air supply pipe 66 more easily flows toward the horizontal pipe 42. As a result, the maximum value of the generated noise is further reduced in the second embodiment compared to the first embodiment.

[0068] (Variation) In the above description, the main body 72 of the core member 70 is formed by cutting out an arc along the inner surface of the air supply connection 61 on the side of the horizontal pipe 42 when viewed from above, but this is not limited to this. The main body 72 may be designed as appropriate depending on the amount of air flowing through the air supply inlet space 72A and the air supply flow path space 72B, the shape of the air supply connection 61, etc.

[0069] In the above description, the lower end of the core member 70 is located below 50% of the height of the single flow path 63 from the vertically upper end of the single flow path 63, but this is not limited to this. The lower end of the core member 70 may be designed appropriately depending on the amount of wastewater flowing through the single flow path 63, the shape of the single flow path 63, etc.

[0070] (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.

[0071] 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]

[0072] 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) 63A Single flow path, 65 Branch flow path (multiple flow paths), 66 Air supply pipe (air supply section) 70, 170, 270 Core member, 72A Air supply inlet space (air supply path), 72B, 172B, 272B Air supply flow path space (air supply path), 76, 176, 276 Flat 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 allowing the drainage water from the horizontal pipe to flow downward; an air vent pipe connected to the temporary storage tank and supplying air to the temporary storage tank; 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; an air supply pipe connecting the air supply unit and the ventilation pipe; a core member that is disposed within the air supply section so as to be removable from the opening, forming an air supply passage, and that closes a part of the air supply section at a lower part of the air supply section so that the cross-sectional area of ​​the air supply passage is smaller than the cross-sectional area of ​​the opening, the core member closing the temporary storage tank side relative to the center of the air supply section when viewed from above, and that as a whole closes 80% or less of the area of ​​the air supply section when viewed from above; A piping structure equipped with:

2. The core member is formed by cutting out an arc along the inner surface of the air supply section on the side of the horizontal drawing pipe in a top view. The piping structure according to claim 1 .

3. The core member has an area on the single flow path side when viewed from above that is 50% of the area of ​​the air supply section when viewed from above. The piping structure according to claim 1 .

4. 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 any one of claims 1 to 3.

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