JP2023179297A - Piping structure - Google Patents

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

The present invention relates to piping structures.

Patent Document 1 listed below describes a siphon drainage system that applies a siphon force to wastewater discharged from plumbing fixtures and temporarily stored in a storage tank to cause it to flow out.

Japanese Patent Application Publication No. 2011-256557

As in Patent Document 1 above, in a siphon drainage system equipped with a temporary storage tank, wastewater flows out from the temporary storage tank to the siphon drainage pipe, and a siphon force is activated at the part (outflow part) where the flow path area is reduced in diameter. When this occurs, loud drainage sounds are likely to occur.

In view of the above facts, an object of the present invention is to provide a piping structure that can reduce drainage noise when siphon force is activated at the outflow portion of wastewater from a temporary storage tank.

The piping structure of the first aspect includes a temporary storage tank that stores wastewater discharged from the plumbing equipment, an outflow section that branches the wastewater discharged from the temporary storage tank from a single flow path into multiple flow paths, and a horizontal draw pipe that is connected to the downstream side of the section and horizontally discharges the wastewater stored in the temporary storage tank from each of a plurality of channels branched at the outflow section; and a horizontal draw pipe that allows the wastewater from the horizontal draw pipe to flow down. a vertical pipe that generates a siphon force in the horizontal drawing pipe by causing the horizontal draw pipe to flow; a vent pipe that is connected to the temporary storage tank and supplies air to the temporary storage tank; an air supply section having a lower end connected across the single flow channel and the plurality of flow channels and supplying air to the horizontal drawing pipe; and an air supply pipe connecting the air supply section and the ventilation pipe; The air supply path is arranged in the air supply section so as to be extractable from the opening, and the cross-sectional area of the air supply path is smaller than the cross-sectional area of the opening at the lower part of the air supply section, when viewed from above. The temporary storage tank side includes a core member whose area is 80% or less of the area of the air supply section when viewed from above.

In this piping structure, a core member that constitutes the air supply path and reduces the cross-sectional area of the flow path at the bottom of the air supply section is placed in the air supply section, and the air supply section is connected to the temporary storage tank through the air supply pipe and the ventilation pipe. is connected to. Further, when viewed from above, the area of the core member on the side of the horizontal drawing pipe is 80% or less of the area of the air supply section. This makes it easier for air to flow from the air supply pipe to the horizontal draw pipe while ensuring the amount of waste water flowing out from the temporary storage tank, making it possible to reduce noise during drainage.

In the piping structure according to a second aspect, in the piping structure according to the first aspect, the core member has an arc-shaped notch along the inner surface of the air supply section on the horizontally drawn pipe side of the core member when viewed from above. It is formed by being drawn.

In this piping structure, the side of the core member on the horizontally drawn pipe is notched in an arc shape along the inner surface of the air supply section, so air supplied from the ventilation pipe can be smoothly supplied to the horizontally drawn pipe. .

In the piping structure according to a third aspect, in the piping structure according to the first aspect or the second aspect, the core member has an area of 50% on the single flow path side when viewed from above of the air supply section. %.

In this piping structure, since the area of the core member on the horizontal drawing pipe side is 50% or less of the area of the air supply section, the air supplied from the ventilation pipe can be smoothly supplied to the horizontal drawing pipe.

A piping structure according to a fourth aspect is the piping structure according to any one of the first to third aspects, in which the lower end of the core member is connected to the single flow path from above in the vertical direction at the upper end of the single flow path. below 50% of the height dimension.

In this piping structure, the lower end of the core member is located below 50% of the height of the flow path from the vertical direction of the flow path of the effluent. The water level of wastewater stored in the storage tank does not fall too low. Therefore, the amount of air contained in the waste water discharged from the temporary storage tank is reduced. Thereby, it is possible to further reduce noise during drainage due to the entrainment of air contained in the wastewater flowing out from the temporary storage tank.

According to the piping structure of the present invention, it is possible to reduce drainage sound when siphon force is activated at the outflow portion of the drainage water from the temporary storage tank.

It is a side view showing piping structure concerning a first embodiment of the present invention. FIG. 1 is a perspective view showing a piping structure according to a first embodiment of the present invention. FIG. 2 is a perspective view showing the vicinity of a branch joint of the piping structure according to the first embodiment of the present invention. 6 is a sectional view taken along line 4B-4B in FIG. 5. FIG. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3. FIG. 1 is a perspective view of a core member according to a first embodiment of the present invention. 6 is a cross-sectional view of a piping structure according to a second embodiment of the present invention, corresponding to line 4B-4B in FIG. 5. FIG. 4 is a cross-sectional view of a piping structure according to a second embodiment of the present invention, corresponding to line AA in FIG. 3. FIG. FIG. 7 is a perspective view of a core member according to a second embodiment of the present invention. 6 is a cross-sectional view of a piping structure according to a comparative example, corresponding to the line 4B-4B in FIG. 5. FIG. FIG. 3 is a perspective view of a core member according to a comparative example. It is a figure which shows the change of the noise at the time of drainage in the piping structure of an Example and the piping structure of a comparative example.

Hereinafter, a piping structure according to an embodiment of the present invention will be described with reference to the drawings. Components indicated using the same reference numerals in each drawing mean the same components. However, unless otherwise specified in the specification, each component is not limited to one, and a plurality of components may exist.

Furthermore, descriptions of overlapping structures and symbols in each drawing may be omitted. Note that the present invention is not limited to the following embodiments, and can be implemented with appropriate changes, such as omitting the configuration or replacing it with a different configuration, within the scope of the purpose of the present invention.

Arrow Z in the figure indicates an upward direction in the vertical direction, and arrows X and Y indicate directions perpendicular to each other in the horizontal direction.

[First embodiment]
<Piping structure>
(Siphon drainage system)
FIG. 1 schematically shows a piping structure 20 according to this embodiment. The piping structure 20 is a structure of a siphon drainage system that discharges waste water from the plumbing fixtures 12 using siphon force. The piping structure 20 is used, for example, in a multi-layered apartment building 10.

The piping structure 20 includes a drainage standpipe 22 that allows drainage to flow downward. The drainage standpipe 22 extends along the vertical direction (vertical direction) and penetrates the slab 14 on each floor of the apartment complex 10. Further, a plurality of drainage stack pipes 22 are provided at different locations on a plane in the apartment house 10. The drainage standpipe 22 is housed, for example, in a piping space (also referred to as a pipe space or the like) that is separated from each residence on each floor of the apartment building 10 by a wall.

Each dwelling unit in the apartment complex 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 introduction pipe 24 is connected to the plumbing fixture 12 .

The other end of the wastewater introduction pipe 24 is connected to a temporary storage tank 30, which will be described later. Thereby, the wastewater introduction pipe 24 introduces the wastewater discharged from the bathtub 12A and the washing area 12B of the plumbing fixture 12 into the temporary storage tank 30. In addition, it is preferable that the wastewater introduction pipe 24 is arranged with a slope so that the temporary storage tank 30 side is lower.

The temporary storage tank 30 can temporarily store waste water from the plumbing fixtures 12, and is formed into a substantially rectangular parallelepiped shape. An inflow section 30A is formed on one side wall of the temporary storage tank 30, and the other end of the waste water introduction pipe 24 is connected thereto. A protrusion 30B is formed at the lower part of one side wall of the temporary storage tank 30 and the other side wall opposite to the other side wall. The inflow portion 30A has a concave shape on the side to which the waste water introduction pipe 24 is connected.

A branch joint 60 as an outflow section, which will be described later, is connected to the protrusion 30B, and a siphon drain pipe 40 is connected via the branch joint 60. The protruding portion 30B has a convex shape that protrudes toward the side to which the branch joint 60 is connected, and has a horizontally elongated outflow opening 30C formed at its tip. The temporary storage tank 30 is made of a resin material such as vinyl chloride.

An inspection port 32 is formed in the top wall of the temporary storage tank 30, and the inspection port 32 is closed with a lid 34.

(branch joint)
As shown in FIGS. 3 and 4, the branch joint 60 has a single flow path section 62 and a double flow path section 64. The single flow path portion 62 extends from the protruding portion 30B, and within the single flow path portion 62, one single flow path 63A and a single flow path 63A from the single flow path 63A are connected to the outflow opening 30C. A single space 63B whose diameter is expanded in the orthogonal horizontal direction is formed. Furthermore, the single flow path section 62 is an example of a "single flow path" in the present disclosure.

The double flow path portion 64 has two parallel channels protruding from the single flow path portion 62 in the same direction as the single flow path portion 62, and inside thereof, two parallel flow paths are arranged parallel to each other along the outer shape of the double flow path portion 64. A branch flow path 65 is formed. Each branch flow path 65 is continuous from the single space 63B, and is connected to a horizontal drawing pipe 42, which will be described later. As shown in FIG. 5, the inner diameter of the single flow path 63A is larger than the inner diameter of the horizontally drawn pipe 42, the lower end of the single flow path 63A is arranged at approximately the same height as the lower end of the horizontally drawn pipe 42, and the single flow path 63A The upper end is located at a higher position than the upper end of the horizontal drawing pipe 42. Further, the multiple flow path section 64 is an example of "multiple flow paths" in the present disclosure.

An air supply connection section 61 serving as an air supply section is formed in the upper part of the single flow path section 62 . In other words, the air supply connection portion 61 spans the single flow path portion 62 and the dual flow path portion 64, and has its lower end connected to the branch joint 60. The air supply connection portion 61 has a substantially cylindrical shape, and has a communication flow path 61A that communicates with the single space 63B from above. An inspection opening 61B that opens upward from the communication flow path 61A is formed at the upper end of the air supply connection portion 61. The inspection opening 61B is closed with a lid 61D. Furthermore, a connection opening 61C that opens from the communication flow path 61A to the ventilation pipe 50 side is formed at the upper side of the air supply connection portion 61. An air supply pipe 66 is connected to the connection opening 61C.

(siphon drain pipe)
As shown in FIG. 2, the siphon drain pipe 40 includes a plurality of horizontal pipes 42 (two in this embodiment) arranged along the slab 14, a merging horizontal pipe 44, and a vertical pipe 46. , and a lateral merging joint member 48.

The horizontal draw pipe 42 discharges waste water discharged from the plumbing fixture 12 in the horizontal direction through a plurality of channels. The horizontally drawn pipe 42 is formed of a polybdenum pipe having a nominal diameter of 25 J (inner diameter approximately 28 mm), for example, and is arranged horizontally on the slab 14 without any slope. Note that the term "no slope" here does not necessarily mean a strictly horizontal direction, and includes a case where there are some steps or slopes along the slab 14.

The “upstream” end of each of the two horizontal drawing pipes 42 is connected to a branch flow path 65 of a branch joint 60. The "downstream" end of each of the lateral draw pipes 42 is connected to one merging lateral draw pipe 44 via a lateral merging joint member 48 . The merging horizontal pipe 44 is composed of two horizontal pipes 4.
This is a horizontal draw pipe that discharges wastewater introduced from 2 in a horizontal direction. Note that the merging horizontal pull pipe 44 and the lateral merging joint member 48 may be integrally configured.

It is preferable that the total cross-sectional area of the two horizontal drawing pipes 42 be less than the cross-sectional area of the drainage introduction pipe 24. Moreover, it is preferable that the cross-sectional area of the confluence horizontal drawing pipe 44 is less than the total cross-sectional area of the two horizontal drawing pipes 42. The cross-sectional area of the confluence horizontal draw pipe 44 and the horizontal draw pipe 42 is set in consideration of the amount of water discharged from the waste water introduction pipe 24 so that the waste water flows through the pipes at full flow as necessary.

As shown in FIGS. 1 and 2, a merging horizontal pipe 44 is connected to the upstream side of the vertical pipe 46. The vertical pipe 46 is arranged in the vertical direction (vertical direction) along the drainage vertical pipe 22 and generates a siphon force in the horizontal draw pipe 42. The other end of the vertical pipe 46 is connected to the merging joint 26. The merging joint 26 is a joint member that allows the drainage from the vertical pipe 46 to join the drainage vertical pipe 22 .

The merging horizontal pipe 44 and the vertical pipe 46 are configured as one continuous path without merging with other drainage pipes on the way up to the merging joint 26, and guide the waste water to the drainage vertical pipe 22. Although the connecting portion between the merging horizontal pipe 44 and the vertical pipe 46 is illustrated as a continuous vent pipe, a joint member such as an elbow may be arranged in this vent pipe portion. When a joint member is arranged, an inspection port or the like can be provided in the joint member as appropriate.

As shown in FIG. 2, a ventilation pipe 50 is connected to the temporary storage tank 30. One end of the ventilation pipe 50 is connected to the upper part of the side wall of the temporary storage tank 30 where the protruding part 30B is formed, and extends substantially parallel to the horizontal drawing pipe 42. The other end of the ventilation pipe 50 is connected to the confluence joint 26. A connection port 67B at the other end of the air supply pipe 66 is connected to a portion of the ventilation pipe 50 near the temporary storage tank 30. The air supply pipe 66 is connected to the drainage vertical pipe 22 via the confluence joint 26. Air flows into and out of the temporary storage tank 30 through the ventilation pipe 50 so that the inside of the temporary storage tank 30 is at atmospheric pressure. Further, air is supplied from the ventilation pipe 50 to the horizontal drawing pipe 42 via the air supply pipe 66.

(core member)
A core member 70 is disposed within the air supply connection portion 61 . As shown in FIG. 6, the core member 70 has a substantially cylindrical shape and includes a main body portion 72 and a locking portion 74. As shown in FIG. The locking portion 74 has an annular shape and is locked to an inner circumferential wall forming the upper end portion of the core member 70 and forming the inspection opening 61B of the air supply connection portion 61. The core member 70 can be extracted from the inspection opening 61B to the communication flow path 61A within the air supply connection portion 61.

The main body portion 72 extends downward from the locking portion 74 and is disposed in the communication channel 61A. An air supply inlet space 72A and an air supply flow path space 72B, which are examples of air supply passages, are formed on the side surface of the main body portion 72. As shown in FIG. 4, the air supply inlet space 72A may be formed by cutting out the main body part 72 in a concave shape at a position corresponding to the air supply connection part 61 when viewed from the side. . The air supply flow path space 72B has an air supply channel on the side of the horizontal draw pipe 42 with respect to the center so that the main body portion 72 is concave toward the side draw pipe 42 rotated by 90 degrees from the air supply inlet space 72A when viewed from above. It may be formed by cutting out an arc along the inner surface of the portion. The air supply inlet space 72A is formed at a height corresponding to the connection opening 61C in the vertical direction (Z direction), and the air supply flow path space 72B is formed at the upper end of the air supply inlet space 72A in the vertical direction (Z direction). It may be formed from the same position to the lower end and communicated with the air supply inlet space 72A.

The side surface of the main body portion 72 where the air supply inlet space 72A and the air supply flow path space 72B are not formed has a shape that follows the inner wall of the air supply connection portion 61. As shown in FIG. 5, the portion of the main body portion 72 facing the outflow portion extends from the upstream side (upper end portion) of the single flow path 63 of the branch joint 60 to the downstream side (the upper end portion of the branch flow path 65). A flat surface 76 is formed diagonally downward. Here, the "upper end" can also be referred to as the "ceiling" of each channel. Moreover, the "flat surface" can also be replaced with "slanted drainage surface" or "sloped ceiling surface".

In a state in which the core member 70 is disposed in the communication channel 61A, the main body portion 72 is disposed on the upstream side (left side in FIG. 5) in the flow direction of waste water inside the air supply connection portion 61. Therefore, the cross-sectional area of the air supply flow path space 72B, which is the portion through which air flows in the lower part of the communication flow path 61A, is smaller than the opening area of the inspection opening 61B. The cross-sectional area of the air supply flow path space 72B in this embodiment is 80% or less of the opening area of the inspection opening 61B. In other words, the main body portion 72 is cut out on the side of the horizontal drawing pipe 42 by 20% or more of the area when the inspection opening 61B is viewed from the top. In this embodiment, the cross-sectional area of the lower end of the communication flow path 61A is the opening area of the air supply flow path space 72B to the single flow path 63, and serves as the opening S.

Further, as shown in FIG. 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 upper end of the single flow path 63 in the vertical direction. In other words, the lower end 76E of the core member 70 may be shaped to be immersed in the waste water when the waste water flows through the single channel portion 62.

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.

<Action and effect>
Next, the functions and effects of the piping structure 20 of this embodiment will be explained.

The piping structure 20 of this embodiment includes a temporary storage tank 30 that stores wastewater discharged from the plumbing fixtures 12, and a branch flow of the wastewater discharged from the temporary storage tank 30 from a single flow path section 62 to a double flow path section 64. A branch joint 60 that branches into a channel 65, a horizontal draw pipe 42 that is connected to the downstream side of the branch joint 60 and horizontally discharges the wastewater stored in the temporary storage tank 30 from each of the branch channels 65, A vertical pipe 46 that generates a siphon force in the horizontal drawing pipe 42 by flowing the wastewater from the pipe 42, a ventilation 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. , which is located above the branch joint 60 and whose lower end is connected across the single flow path 63 and the branch flow path 65, and which supplies air to the horizontal pipe 42, and an air supply connection portion. An air supply pipe 66 that connects the air supply pipe 61 and the ventilation pipe 50 is arranged in the air supply connection part 61 so as to be able to be extracted from the inspection opening 61B, and forms an air supply inlet space 72A and a supply air passage space 72B. 61, the cross-sectional area of the air supply inlet space 72A and the air supply flow path space 72B is made smaller than the cross-sectional area of the inspection opening 61B, so that the single flow path 63 side in a top view is A core member 70 having an area of 80% or less is provided.

In this piping structure 20, a core member 70 that constitutes an air supply inlet space 72A and an air supply passage space 72B and reduces the flow passage cross-sectional area at the lower part of the air supply connection part 61 is disposed within the air supply connection part 61. , the air supply connection part 61 is connected to the temporary storage tank 30 through the air supply pipe 66 and the ventilation pipe 50. Further, the area of the core member 70 on the side of the horizontal drawing pipe 42 is 80% or less of the area of the air supply connection portion 61 when viewed from above. This makes it easier for air to flow from the air supply pipe 66 to the horizontal pipe 42 while ensuring the amount of waste water flowing out from the temporary storage tank 30, thereby reducing noise during drainage.

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

In this piping structure 20, since the side of the core member 70 on the horizontal drawing pipe 42 side is notched in an arc shape along the inner surface of the air supply connection part 61, the air supplied from the ventilation pipe 50 can be smoothly transferred to the horizontal drawing pipe. 42 can be supplied.

Further, the lower end of the core member 70 in this embodiment is located below 50% of the height of the single flow path 63 from the upper end of the single flow path 63 in the vertical direction.

In this piping structure 20, since the lower end of the core member 70 is located below 50% of the height of the flow path from the vertical direction of the flow path of the effluent, the flow velocity of the wastewater flowing through the flow path is reduced. , the water level of the wastewater stored in the temporary storage tank 30 does not drop too much. Therefore, the amount of air contained in the waste water flowing out from the temporary storage tank 30 is reduced. This makes it possible to further reduce noise during drainage due to entrainment of air contained in the wastewater flowing out from the temporary storage tank 30.

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

As shown in FIGS. 7 to 9, in the core member 170 according to the second embodiment, the main body portion 72 may be formed with a semicircular cutout on the side closer to the horizontal drawing tube 42 than the center. . In other words, in the core member 170 in this embodiment, the single flow path 63 side may be 50% of the area of the air supply connection portion 61 when viewed from above.

As shown in FIG. 8, the lower end 176E of the core member 170 is located below 50% of the height of the single flow path 63 from the upper end of the single flow path 63 in the vertical direction, as in the first embodiment. You can leave it there. Further, the flat surface 176 may have a larger angle with the horizontal direction than the flat surface 76 in the core member 70 of the first embodiment, and the lower end 176E may have a width in the horizontal direction.

The shape of 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.

<Action and effect>
Next, the functions and effects of this embodiment will be explained.

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

In this embodiment, since the area of the core member 170 on the side of the horizontal drawing pipe 42 is 50% or less of the area of the air supply connection part 61, the area of the side of the horizontal drawing pipe 42 of the core member 170 is 50% or less of the area of the air supply connection part 61. The air supplied from the ventilation pipe 50 can be supplied to the horizontal drawing pipe 42 more smoothly than when the ratio is smaller than 50%.

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

(Example)
Next, the results of comparing 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. explain.

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

10 and 11 are diagrams showing a piping structure 20 in which a core member 270 of a comparative example is used. The core member 270 of the comparative example is different from the core member 70 of the example 1 in that the main body portion 272 has a concave shape from the horizontal drawing pipe 42 side toward the single flow path 63 side below the air supply inlet space 72A. It differs in that it is formed by notching it. Note that, as shown in FIGS. 10 and 11, the cross-sectional area of the air supply passage space 272B of the core member 270 of the comparative example is 9.5% of the opening area of the inspection opening 61B.

Further, 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 of the single flow path 63 from the upper end of the single flow path 63 in the vertical direction, as in the first embodiment.

The shape of the other parts of the core member 270 of the comparative example is equivalent to the core member 70 of the first embodiment or the core member 170 of the second embodiment.

FIG. 12 is a comparison result of noise when wastewater flows into the piping structure 20 by the core member 70 of Example 1, the core member 170 of Example 2, and the core member 270 of the comparative example. In addition, "Example 1" in the figure is the core member 70 according to the above-described first embodiment, and "Example 2" is the core member 170 according to the above-described second embodiment.

As shown in FIG. 12, after the siphon force is activated by the drainage water flowing from the temporary storage tank 30 through the horizontal pipe 42 and into the vertical pipe 46, in each of Example 1, Example 2, and Comparative Example, noise is generated. is occurring. However, as shown in FIG. 12, in Examples 1 and 2, the maximum value of the noise level is smaller than that of the comparative example, and furthermore, in Example 2, the maximum value of the noise level is smaller than that of the comparative example. small compared to In other words, in Example 1 and Example 2, the average values of auditory sensation and sound pressure are smaller than in the comparative example.

In addition, in this way, when the core member 70 of Example 1 and the core member 170 of Example 2 were used, the maximum value of noise was suppressed compared to the case where the core member 270 of the comparative example was used. The reason is assumed to be as follows.

First, at a time when the water level of the temporary storage tank 30 is lowered, when the water level of the temporary storage tank 30 is lowered, the air in the temporary storage tank 30 is drawn in and flows out to the branch joint 60 along with the drainage water. The waste water containing air flowing out from the temporary storage tank 30 hits the flat surface 276 of the core member 270, and the flow of the waste water is disturbed, thereby generating noise.

Here, since the cross-sectional area of the air supply flow path space 72B of Example 1 and the cross-sectional area of the air supply flow path space 172B of Example 2 are larger than the cross-sectional area of the air supply flow path space 272B of the comparative example, The supplied air tends to flow toward the horizontal drawing pipe 42. This makes it difficult for the air-containing waste water flowing out of the temporary storage tank 30 to pass through the single flow path 63, thereby reducing noise.

In addition, since the air supply flow path space 172B of the second embodiment has a larger cross-sectional area than the air supply flow path space 72B of the first embodiment, the air supplied from the air supply pipe 66 can more easily flow toward the horizontal drawing pipe 42. . As a result, in the second embodiment, the maximum value of generated noise is reduced more than in the first embodiment.

(Modified example)
In the above description, the main body part 72 of the core member 70 is formed by cutting out the horizontal draw pipe 42 side in an arc shape along the inner surface of the air supply connection part 61 when viewed from above, but the present invention is not limited to this. do not have. The main body portion 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 portion 61, and the like.

Furthermore, in the above description, the lower end of the core member 70 was said to be below 50% of the height of the single flow path 63 from the upper end of the single flow path 63 in the vertical direction. Not limited. The lower end of the core member 70 may be designed as appropriate depending on the amount of drainage flowing through the single flow path 63, the shape of the single flow path 63, and the like.

(Other embodiments)
In the above embodiment, the branch joint 60 has a shape in which the single flow path 63A and the branch flow path 65 are arranged in parallel. A branch joint having a shape (a DC flow path and a shape branching obliquely from the DC flow path) may be used.

Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, those with ordinary knowledge in the technical field to which the present disclosure pertains will understand that the embodiments are within the scope of the technical idea described in the claims. It is clear that various modifications or applications can be made, and it is understood that these naturally fall within the technical scope of the present disclosure.

12 Plumbing equipment, 20 Piping structure, 30 Temporary storage tank 42 Horizontal pipe, 46 Vertical pipe, 50 Ventilation pipe, 60 Branch joint (outflow part)
61 Air supply connection part (air supply part), 61A Communication channel, 61B Inspection opening (opening part)
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 (4)

A temporary storage tank that stores wastewater discharged from plumbing equipment;
an outflow section that branches the wastewater discharged from the temporary storage tank from a single flow path into multiple flow paths;
a horizontal draw pipe connected to the downstream side of the outflow section and for laterally discharging the wastewater stored in the temporary storage tank from each of a plurality of channels branched at the outflow section;
a vertical pipe that generates a siphon force in the horizontal pipe by causing drainage from the horizontal pipe to flow down;
a ventilation pipe connected to the temporary storage tank and supplying air to the temporary storage tank;
an air supply part having an opening, located above the outflow part, connected at a lower end across the single flow path and the plurality of flow paths, and supplying air to the horizontal drawing pipe;
an air supply pipe connecting the air supply section and the ventilation pipe;
The air supply path is arranged in the air supply section so as to be extractable from the opening, and the cross-sectional area of the air supply path is smaller than the cross-sectional area of the opening at the lower part of the air supply section, when viewed from above. and a core member in which the temporary storage tank side is 80% or less of the area of the air supply part when viewed from above;
Piping structure with. The core member is formed by cutting out the horizontally drawn pipe side of the core member in an arc shape along the inner surface of the air supply section when viewed from above.
The piping structure according to claim 1. In the core member, when viewed from above, the single flow path side is 50% of the area when the air supply section is viewed from above.
The piping structure according to claim 1. The lower end of the core member is located below 50% of the height of the single flow path from the upper end of the single flow path in the vertical direction.
The piping structure according to any one of claims 1 to 3.