JP7653344B2 - Piping structure - Google Patents

Description

The present invention relates to a piping structure.

A siphon drainage system is disclosed that has a temporary storage tank that temporarily stores wastewater discharged from plumbing fixtures, and multiple siphon drainage pipes that are connected to the temporary storage tank and apply siphon force to the wastewater stored in the temporary storage tank to cause it to flow out (see Patent Document 1). The siphon drainage pipes are configured with a horizontal pull pipe that is connected to the temporary storage tank, and a vertical pipe that communicates with the downstream side of the horizontal pull pipe, extends downward, and merges with the drainage standpipe.

JP 2011-256557 A

The amount of wastewater discharged per unit time from plumbing fixtures varies from fixture to fixture. For example, a toilet discharges less than 10 liters at a time, while a bathtub may discharge around 200 liters at a time. When discharging such a large amount of wastewater, it may take a long time to drain using a siphon drain pipe with a small inner diameter. Also, if the horizontal pipe is long (for example, 10 m), it takes a long time to obtain the flow rate required for siphoning at the drop-in section, which lengthens the time for siphoning to occur, and wastewater is more likely to accumulate in the temporary storage tank.

In addition, when multiple outlets are provided in a temporary storage tank, it is desirable to position the outlets close to each other from the viewpoint of reducing pressure loss. However, when the temporary storage tank is a resin molded product and multiple outlets are formed facing in the same direction in a horizontal plane, if the outlets are positioned too close to each other, it becomes difficult to mold the portions between adjacent outlets.

The present invention aims to ensure the moldability of the temporary storage tank, which is a resin molded product, in a piping structure in which multiple siphon drain pipes are provided, thereby improving yield and shortening the siphon generation time.

The piping structure according to the first aspect includes a temporary storage tank made of a resin molded product and provided in a drainage system, a plurality of first horizontal pipes each connected via a joint to the plurality of outlets provided in the temporary storage tank and discharging the wastewater discharged from the temporary storage tank in a horizontal direction, a junction section that merges the plurality of first horizontal pipes into one, a second horizontal pipe connected to the downstream side of the junction and discharging the merged wastewater in a horizontal direction, and a vertical pipe connected to the downstream side of the second horizontal pipe and generating a siphon force in the first horizontal pipe and the second horizontal pipe by flowing the wastewater downward, and the outlets are arranged such that the adjacent joints are spaced apart.

In this piping structure, the temporary storage tank, which is a resin molded product, has multiple outlets arranged so that adjacent fittings are spaced apart, ensuring moldability near the outlets and improving yield. In addition, by draining water from the temporary storage tank through multiple first horizontal pipes, the flow rate of the second horizontal pipe can be increased, quickly filling the drop-off section from the second horizontal pipe to the vertical pipe. This shortens the time it takes for siphoning to occur.

In the second aspect, in the piping structure according to the first aspect, the outlets are formed facing in the same direction in a plan view, and the center-to-center distance between adjacent outlets in a plan view is 1.5 times or more the minimum dimension at which adjacent fittings do not interfere with each other.

In this piping structure, the outlets are formed facing in the same direction in plan view, and the center-to-center distance between adjacent outlets in plan view is 1.5 times or more the minimum dimension at which adjacent fittings do not interfere with each other, which further improves the formability of the temporary storage tank and increases yields.

The third aspect is the piping structure according to the first aspect, in which the outlets are formed facing in different directions in a plan view.

In this piping structure, the multiple outlets are formed facing in different directions in a plan view, so that the multiple outlets can be placed close to each other while suppressing interference between the joints. This makes it possible to suppress pressure loss when draining water from the temporary storage tank.

In the fourth aspect, in the piping structure according to any one of the first to third aspects, the outlet is provided at a position opposite the inlet of the temporary storage tank in the drainage direction in a plan view.

In this piping structure, the outlet is located opposite the inlet 30A of the temporary storage tank in the drainage direction when viewed from above, so that the wastewater that flows into the temporary storage tank from the inlet 30A flows in a straight line to the outlet. This prevents the wastewater from losing momentum, allowing the wastewater to flow quickly to the first horizontal pipe, the second horizontal pipe, and then to the vertical pipe. This further shortens the siphoning time.

According to the present invention, in a piping structure in which multiple siphon drain pipes are provided in a temporary storage tank that is a resin molded product, it is possible to ensure the moldability of the temporary storage tank, improve yield, and shorten the siphon generation time.

FIG. 2 is a side view showing the piping structure according to the embodiment. FIG. 1 is a perspective view showing a piping structure according to an embodiment of the present invention. FIG. 2 is a plan view showing a piping structure according to the embodiment. FIG. 4 is a plan view showing the outlet of the temporary storage tank. FIG. 11 is a plan view showing an outlet according to the first modified example. FIG. 11 is a plan view showing an outlet according to Modification 2.

The following describes an embodiment of the present invention with reference to the drawings. Components indicated with the same reference numerals in each drawing are the same or similar components. Note that duplicated descriptions and reference numerals in the embodiments described below may be omitted. In addition, all drawings used in the following description are schematic, and the dimensional relationships and ratios of each element shown in the drawings do not necessarily match the actual ones. In addition, the dimensional relationships and ratios of each element between multiple drawings do not necessarily match.

Figure 1 shows an outline of the piping structure 20 according to this embodiment. The piping structure 20 is a siphon drainage system structure that uses 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 formed in multiple layers. As shown in Figure 2, this piping structure 20 includes a temporary storage tank 30, a plurality of first horizontal pipes 31A, 31B, a pipe fitting 48 as an example of a junction, a second horizontal pipe 44, and a vertical pipe 46. The portion from the first horizontal pipes 31A, 31B to the vertical pipe 46 can also be called a siphon drainage pipe 40.

The piping structure 20 includes a drainage standpipe 22 that drains wastewater downward. A plurality of drainage standpipes 22 are provided at different locations on the floor of the apartment building 10. For example, the drainage standpipes 22 are housed vertically (in the vertical direction) in a piping space (also called a pipe space, etc.) that is separated by walls from each dwelling unit on each floor of the apartment building 10, and penetrate the slab 14 on each floor of the apartment building 10.

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 inlet pipe 24 is connected to the plumbing fixture 12.

The other end of the wastewater inlet pipe 24 is connected to the temporary storage tank 30. As a result, the wastewater inlet pipe 24 introduces wastewater discharged from the bathtub 12A and the washing area 12B of the plumbing fixtures 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.

The temporary storage tank 30 is a resin molded product provided downstream of the water-related equipment 12 in the drainage system and provided with multiple outlets 30C (Figure 4). This temporary storage tank 30 is a container for temporarily storing the wastewater introduced from the water-related equipment 12 through the wastewater inlet pipe 24 and discharging it to the drainage standpipe 22. The temporary storage tank 30 is formed by blow molding a resin material such as rigid polyvinyl chloride. The siphon drain pipe 40 according to this embodiment is connected to the downstream side of the wastewater in the temporary storage tank 30. A protrusion 30B is formed so that the wastewater collects in the center of the width direction of the temporary storage tank 30 on the opposite side of the inlet 30A in the drainage direction A in a plan view. This protrusion 30B is provided with, for example, two outlets 30C. The first horizontal pipes 31A and 31B are connected to the two outlets 30C via joints 28.

The outlets 30C are arranged such that adjacent fittings 28 are spaced apart. Specifically, the outlets 30C are formed, for example, substantially parallel to each other in the same direction in a plan view, and the center-to-center distance L of adjacent outlets 30C in a plan view is 1.5 times or more the minimum dimension at which adjacent fittings 28 do not interfere with each other. As an example, when the inner diameter of the outlet 30C is 38 mm, the minimum dimension at which the fittings 28 do not interfere with each other is, for example, 55 mm. Considering the moldability of the temporary storage tank 30, which is a resin molded product, the center-to-center distance L of the outlets 30C in a plan view is, for example, 100 mm. In this case, the center-to-center distance L is about 1.8 times (100/55 ≒ 1.8) the minimum dimension at which the fittings 28 do not interfere with each other. Note that, since the pressure loss increases as the center-to-center distance L increases, the upper limit of the center-to-center distance L is set in consideration of the allowable pressure loss.

In FIG. 3, the two outlets 30C are provided on the protruding portion 30B. For example, the protruding portion 30B is provided at a position facing the inlet 30A of the temporary storage tank 30 in the drainage direction A in a plan view. Accordingly, the two outlets 30C are also provided at a position facing the inlet 30A of the temporary storage tank 30 in the drainage direction A in a plan view.

As shown in Figs. 5 and 6, the two outlets 30C may be formed facing in different directions in plan view. In the first modification shown in Fig. 5, the two outlets 30C are formed in an inverted V shape so that they move away from each other toward the tip side (downstream side). In the second modification shown in Fig. 6, one of the two outlets 30C is formed parallel to the drainage direction A, and the other is formed at an angle to the drainage direction A.

The first horizontal pipes 31A, 31B are pipes that are arranged, for example, along the slab 14 and are arranged approximately parallel to each other in the horizontal direction. The first horizontal pipes 31A, 31B are horizontal pipes that are connected to the outlets 30C provided in the temporary storage tank 30 via joints 28 and discharge wastewater discharged from the temporary storage tank 30 in the horizontal direction. The first horizontal pipes 31A, 31B are formed, for example, from polybutene pipes with a nominal diameter of 25J (inner diameter of approximately 28 mm) and are arranged without gradient along the horizontal direction on the slab 14. Note that "without gradient" here does not have to be strictly horizontal, and includes pipes with some steps or gradients along the slab 14.

The center line passing through the center of the arrangement direction of the two first horizontal pipes 31A, 31B is located on an extension of the center line CL of the wastewater inlet pipe 24. Furthermore, the center line of the second horizontal pipe 44 is also located on an extension of the center line CL of the wastewater inlet pipe 24. Note that the two first horizontal pipes 31A, 31B do not necessarily have to be arranged parallel to each other, depending on the conditions of the installation site.

The total cross-sectional area of the two first horizontal pipes 31A, 31B is less than the cross-sectional area of the wastewater inlet pipe 24. Furthermore, the cross-sectional area of the second horizontal pipe 44 is less than the total cross-sectional area of the two first horizontal pipes 31A, 31B. The second horizontal pipe 44 and the first horizontal pipes 31A, 31B are set so that wastewater flows at full capacity, and a siphon force acts on the wastewater in the downstream direction of the second horizontal pipe 44 and the first horizontal pipes 31A, 31B due to the energy of the siphon head.

If a siphon effect is obtained, the total cross-sectional area of the two first horizontal pipes 31A, 31B may be greater than or equal to the cross-sectional area of the wastewater inlet pipe 24. Similarly, if a siphon effect is obtained, the cross-sectional area of the second horizontal pipe 44 may be greater than or equal to the total cross-sectional area of the two first horizontal pipes 31A, 31B. If the cross-sectional area varies depending on the location along the axial direction, the cross-sectional area referred to here refers to the average cross-sectional area.

As shown in FIG. 4, the pipe joint 48 is a member that joins the multiple first horizontal pipes 31A, 31B into one. This pipe joint 48 is, for example, Y-shaped, but is not limited to this and may be another shape.

The second horizontal pipe 44 is, for example, a pipe arranged along the slab 14, connected to the downstream side of the pipe joint 48, and discharges the combined wastewater in a horizontal direction. The second horizontal pipe 44 is formed, for example, from a hard polyvinyl chloride pipe with a nominal diameter of 30A (inner diameter of 30 mm), and is arranged without gradient along the horizontal direction on the slab 14.

The standpipe 46 is connected to the downstream side of the second horizontal pipe 44, and generates a siphon force in the first horizontal pipes 31A, 31B and the second horizontal pipe 44 by flowing the wastewater downstream. The standpipe 46 is, for example, a hard polyvinyl chloride pipe with a nominal diameter of 25A (inner diameter of 25 mm). The standpipe 46 is arranged, for example, in the up-down direction (vertical direction) along the drainage standpipe 22. The downstream end of the standpipe 46 reaches the junction joint 26. The junction joint 26 is a pipe joint that merges the wastewater from the standpipe 46 with the drainage standpipe 22. The length from the pipe joint 48 to the standpipe 46 may be, for example, 500 to 1000 mm.

The drop-in section located at the boundary between the second horizontal pipe 44 and the vertical pipe 46 is illustrated as a continuous vent pipe, but a pipe fitting such as an elbow may be placed in this vent pipe section. If a pipe fitting is placed here, an inspection hatch or the like can be appropriately provided in the pipe fitting. The drop-in section from the second horizontal pipe 44 to the vertical pipe 46 is placed outside the dwelling unit, for example, inside a meter box.

An air vent pipe 50 is further connected to the temporary storage tank 30, and the air vent pipe 50 reaches the junction joint 26.

(Action)
The present embodiment is configured as described above, and its operation will be described below. In the piping structure 20 according to the present embodiment, the temporary storage tank 30, which is a resin molded product, has a plurality of outlets 30C arranged so that adjacent joints 28 are spaced apart from each other, so that moldability near the outlets 30C can be ensured and the yield can be improved. In particular, molding of the portion between the two outlets 30C during blow molding becomes easy. Also, as shown in FIG. 4, the outlets 30C are formed in the same direction in a plan view, and the center-to-center distance L of the adjacent outlets 30C in a plan view is set to 1.5 times or more the minimum dimension at which the adjacent joints 28 interfere with each other, so that the moldability of the temporary storage tank 30 can be further improved and the yield can be improved.

Furthermore, as shown in FIG. 3, the outlet 30C is provided at a position opposite the inlet 30A of the temporary storage tank 30 in the drainage direction in a plan view, so that the wastewater that flows into the temporary storage tank 30 from the inlet 30A flows linearly to the outlet 30C. This suppresses a decrease in the force of the wastewater (pressure loss), so that the wastewater can be quickly drained to the first horizontal pipes 31A and 31B, the second horizontal pipe 44, and further to the vertical pipe 46. This further shortens the siphoning time.

As shown in Figures 5 and 6, when the multiple outlets 30C are formed facing in different directions in a plan view, the multiple outlets 30C can be arranged close to each other while suppressing interference between the joints 28. This makes it possible to suppress pressure loss when draining water from the temporary storage tank 30.

In addition, wastewater from the temporary storage tank 30 is discharged through the first horizontal pipes 31A, 31B, the second horizontal pipe 44, and the vertical pipe 46. Specifically, the wastewater flowing through the first horizontal pipes 31A, 31B joins at a pipe joint 48 and is led to the vertical pipe 46 through the second horizontal pipe 44. As the wastewater falls through the vertical pipe 46, a siphon force acts on the first horizontal pipes 31A, 31B and the second horizontal pipe 44. When the siphon force is generated, the wastewater stored in the temporary storage tank 30 is quickly discharged.

In this embodiment, by discharging water through multiple first horizontal pipes 31A, 31B, the flow rate of the second horizontal pipe 44 can be increased and the drop-off section from the second horizontal pipe 44 to the vertical pipe 46 can be filled up quickly, compared to a configuration in which only one horizontal pipe is connected. This shortens the time it takes for siphoning to occur. This prevents wastewater from overflowing the plumbing fixture 12 located upstream of the temporary storage tank 30. Even if a large amount of wastewater is discharged from the bathtub 12A at once, it is quickly discharged because the wastewater is treated by multiple first horizontal pipes 31A, 31B. In addition, a larger amount of wastewater can be processed.

In addition, even if dirt accumulates or foreign matter clogs one of the first horizontal pipes 31A, 31B, wastewater can be discharged from the other first horizontal pipe 31A, 31B, reducing the risk of being unable to drain water.

Thus, according to this embodiment, in a piping structure 20 in which a temporary storage tank 30, which is a resin molded product, is provided with multiple siphon drain pipes (first horizontal pipes 31, 32), it is possible to ensure the moldability of the temporary storage tank 30, improve yield, and shorten the siphon generation time.

[Other embodiments]
An example of an embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

For example, although there are two outlets 30C, there may be three or more outlets 30C, each connected to a first horizontal pipe. Also, although the outlet 30C is provided at a position facing the inlet 30A of the temporary storage tank 30 in the drainage direction A in a plan view, this is not limited thereto, and the outlet 30C and the inlet 30A do not have to face each other as long as the pressure loss is within an acceptable range.

20...piping structure, 28...joint, 30...temporary storage tank, 30A...inlet, 30C...outlet, 31A...first horizontal pipe, 31B...first horizontal pipe, 44...second horizontal pipe, 46...vertical pipe, 48...pipe joint (junction), A...drainage direction, L...center distance

Claims (4)

a temporary storage tank made of a resin molded product, the temporary storage tank being provided in the drainage system and having a plurality of outlets provided in one protruding portion ;
A plurality of first horizontal pipes that are connected to the plurality of outlets provided in the temporary storage tank via joints and that laterally discharge the wastewater discharged from the temporary storage tank;
A junction portion that merges the plurality of first horizontal pipes into one;
A second horizontal pipe connected to the downstream side of the confluence and discharging the combined wastewater in a horizontal direction;
A vertical pipe connected to the downstream side of the second horizontal pipe and causing the wastewater to flow downward to generate a siphon force in the first horizontal pipe and the second horizontal pipe;
Equipped with
The outlets are arranged such that adjacent joints are spaced apart from each other. The outlets are formed in the same direction as each other in a plan view,
The piping structure according to claim 1 , wherein a center-to-center distance between adjacent outlets in a plan view is 1.5 times or more a minimum dimension where adjacent joints do not interfere with each other. The piping structure according to claim 1, wherein the outlets are formed in different directions in a plan view. The piping structure according to any one of claims 1 to 3, wherein the outlet is provided at a position opposite the inlet of the temporary storage tank in the drainage direction in a plan view.