JP2019203271A - Drain pipe structure - Google Patents

Abstract

To provide the drain pipe structure that allows drainage to flow smoothly.SOLUTION: The drain pipe structure of the present invention comprises: a drain pipe 40 that is connected to an exhaust port 41b of a bottom surface 41a of a water-circulating device 41 and has a flow channel FP that flows drainage, a water reservoir part 37 that is provided in middle of the flow channel of the drain pipe 40 and can collect the drainage, and a vent pipe 39 that has a lower opening end 39a and an upper open end 39b positioned above the lower opening end, wherein a lower open end 39a of the vent pipe 39 is located in the drain pipe 40 and above the water reservoir part 37 on an upstream side of the flow channel FP from the water reservoir part 37, and the upper open end 39b of the vent pipe 39 is located at the same height as the bottom surface 41a of the water-circulating device 41 or above the bottom surface 41a of the water-circulating device 41.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drain pipe structure.

For example, in a siphon drainage system using the occurrence of the siphon phenomenon, since drainage begins to flow into the drainpipe, it takes a certain time until the siphon force is generated and negative pressure is generated. It could happen that it did not flow quickly. Thus, studies have been made on the structure of drainage pipes that generate negative pressure quickly.
For example, Patent Document 1 discloses that a siphon phenomenon can be suitably generated by narrowing the water passage area at the rising portion of the drain trap from the bent portion.

JP-A-2015-98702

  However, even in the structure as in Patent Document 1, the air on the upstream side of the sealed water in the drain trap is compressed by being sandwiched between the waste water flowing from the upstream and the sealed water, particularly in the early stage of drainage. Then, there is a possibility that the drainage does not flow sufficiently smoothly due to the pressure of the compressed air.

  An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a drain pipe structure that can smoothly drain water.

The drain pipe structure of the present invention is connected to a drain outlet on the bottom surface of a watering device, and includes a drain pipe provided with a flow path for flowing waste water, and drainage provided in the middle of the flow path of the drain pipe. A water reservoir portion, a lower open end, and a vent pipe provided with an upper open end located above the lower open end, and the lower open end of the vent pipe is the drainage It is in a pipe and is located above the water pool part on the upstream side of the flow path from the water pool part, and the upper opening end of the vent pipe is at the same height as the bottom surface of the water pool apparatus or of the water pool apparatus. It is located above the bottom surface.
According to the drain pipe structure of the present invention, the drainage can flow smoothly.

In the drainage pipe structure of the present invention, it is preferable that the upper opening end of the ventilation pipe is located above the planned water surface when the water-circulating device is full.
According to this configuration, since drainage does not flow from the upper opening end of the vent pipe, the drainage can flow more smoothly.

In the drainage pipe structure of the present invention, it is preferable that the vent pipe is housed in the drainage pipe and in the watering device.
According to this configuration, it is possible to attach the vent pipe by simple construction.

In the drain pipe structure according to the present invention, it is preferable that the vent pipe is connected to the through hole of the eye plate having a through hole attached to the drain port on the bottom surface of the watering device.
According to this configuration, the ventilation pipe can be attached by a simple method.

In the drainage pipe structure of the present invention, the drainage pipe is turned downward and then turned upward as it goes downstream of the flow path, and the flow of the first return part A second folded portion that is connected to the downstream side of the path and is folded from the upper side toward the lower side, and the water reservoir portion is configured to include the first folded portion, It is preferable that the lower opening end of the ventilation pipe is located above the water reservoir portion and below the highest position on the inner peripheral surface of the second folded portion.
According to this configuration, the drainage can flow more smoothly.

  ADVANTAGE OF THE INVENTION According to this invention, the drain pipe structure which can flow waste_water | drain smoothly can be provided.

It is the schematic which shows an example of the drainage system using the drain pipe structure which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the drain pipe structure which concerns on the 1st Embodiment of this invention in the state attached to the water supply apparatus. FIG. 3 is a schematic cross-sectional view schematically showing the state of drainage flowing through the drainage pipe structure according to the first embodiment of the present invention, and FIG. 3A shows how the drainage begins to flow into the drainage pipe. (B) shows how the drainage flows into the drain pipe and the air in the drain pipe passes through the vent pipe. It is a partial schematic cross section which shows the 1st modification of the 1st Embodiment of this invention in the state attached to the watering apparatus. It is a partial perspective view which shows the 2nd modification of the 1st Embodiment of this invention in the state attached to the water supply apparatus. It is sectional drawing which shows the drain pipe structure which concerns on the 2nd Embodiment of this invention in the state attached to the water supply apparatus. It is the perspective view which showed the vent pipe used in the 2nd Embodiment of this invention with the eye plate.

  Embodiments of the drain pipe structure according to the present invention will be described below with reference to the drawings.

[First embodiment]
A first embodiment of the present invention will be described with reference to FIGS.
(Drainage system)
First, an example of a drainage system using the drainage pipe structure according to the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic view showing an example of the drainage system. Here, for the sake of simplification of description, the description will be made by omitting a later-described vent pipe in the drain pipe structure according to the first embodiment of the present invention. Moreover, in each figure below, a broken line part shows water (drainage etc.).
In FIG. 1, the drainage system 10 includes a siphon drainage structure, for example. In this example, the drainage stack 17 that penetrates the piping hole 21 of the floor slab 20 of the building is provided with a junction joint 18 that connects the piping from the water-circulating device 11. The waste water from the water supply device 11 and the waste water from the water supply device 11 are combined. In FIG. 1, the configuration of the connecting portion of each pipe is omitted as appropriate. The drainage system 10 is connected to the downstream side in order from the upstream side in order to connect the first drainage pipe 12, the drainage trap 13, the drainage trap 13 and the horizontal pulling pipe 15 connected to the bottom of the watering device 11. It has a bent pipe 14 provided with a bent portion, a horizontal pulling pipe 15, and a soot pipe 16. A siphon drain pipe is mainly constituted by the vent pipe 14, the horizontal pull pipe 15 and the soot pipe 16. Further, at least by the first drain pipe 12 and the drain trap 13 (in the drainage system of this example, the first drain pipe 12, the drain trap 13, the vent pipe 14, the horizontal pull pipe 15, The drainage pipe 40 described later is configured in the drainage pipe structure according to the first embodiment of the present invention. Specifically, the water supply device 11 is a washstand or the like, for example.
In addition, the drainage pipe structure which concerns on other embodiment of this invention mentioned later is also applicable to said drainage system 10. FIG.

  In this drainage system 10, the drainage that has flowed from the water-circulating device 11 flows from the horizontal pulling pipe 15 into the vertical pipe 16 in a state where the inside of the pipe is filled with drainage, and siphon force is generated by flowing down the drainage downward. generate. The horizontal pipe 15 is made of a pipe that is thinner than the pipe used for conventional gradient drainage, and the inside of the horizontal pipe is easily filled with drainage. Further, since the horizontal pipe 15 is installed substantially horizontally (substantially no gradient), the inside of the horizontal pipe tends to be filled with drainage. In this manner, the siphon force is easily generated because the inside of the horizontal pulling tube is easily filled with water.

  A siphon force (negative pressure) directed in the discharge direction acts on the drainage of the horizontal pulling tube 15 by being pulled by the siphoning force generated in the soot tube 16. The siphon force continues to be generated as long as the drainage is in the drainpipe, and when the amount of drainage decreases, the drainage flows downstream while entraining the air, and eventually all the drainage discharged from the water circulation device 11 passes through the junction joint 18. When it joins the drainage stack 17 and flows downstream, no siphon force is generated.

Next, the first embodiment of the present invention will be described in more detail with reference to FIGS.
As shown in FIG. 2, the drain pipe structure of the present embodiment is connected to the drain port 41 b of the bottom surface 41 a of the water-circulating device 41 and includes a drain pipe 40 and a drain pipe 40 having a flow path FP through which drainage flows. A vent pipe 39 provided with a water pool portion 37 provided in the middle of the flow path FP and capable of collecting drainage, a lower opening end 39a, and an upper opening end 39b positioned above the lower opening end 39a. And have.

(Drain pipe and pool)
As shown in FIG. 2, in the present embodiment, the drain pipe 40 is connected to a drain port 41 b on the bottom surface 41 a of the watering device 41. The drainage pipe 40 has a water pool portion 37 in which drainage can collect in the middle of the flow path FP.
In the example of FIG. 2, the drain pipe 40 is turned downward and then turned upward as it goes to the downstream side of the flow path FP, and the flow path FP of the first return part 32. A second folded portion 34 that is connected to the downstream side of the first and second portions 34 and is folded from the upper side toward the lower side.
More specifically, in the example of FIG. 2, the drain pipe 40 is connected to at least the first drain pipe 42 connected to the drain port 41 b of the water-circulating device 41 and the downstream side of the first drain pipe 42. Connected to the downstream drainage pipe 31 and the downstream side of the downstream drainage pipe 31, and as it goes to the downstream side of the flow path FP, the first folding part is folded from the lower side toward the upper side. 32, the upstream drain pipe 33 connected to the downstream side of the flow path FP of the first folded portion 32, and the downstream side of the flow path FP of the upstream drain pipe 33, and from above The second folded portion 34 that is folded back and goes downward (that is, the second folded portion 34 is indirectly connected to the first folded portion 32 via the upstream drain pipe 33). A second exhaust connected to the downstream side of the second folded portion 34. The tube 43 from being configured.
In the example of FIG. 2, the water reservoir portion 37 where the drainage can be collected is configured to include the first folded portion 32. More specifically, the water reservoir portion 37 is provided as the descending drain pipe 31, the first folded portion 32, and the ascending drain pipe 33.
A drain trap 30 is formed by the descending drain pipe 31, the first folded part 32, the upstream drain pipe 33, and the second folded part 34.

In the example of FIG. 2, the drain trap 30 is an S-shaped trap, for example, a resin molded product. Water (sealed water) (see the broken line portion in FIG. 2) is accumulated in the water reservoir portion 37 of the drain trap 30 in a normal state where water is not drained. Due to the presence of the sealed water, it is possible to prevent the odor coming out from the downstream side of the drain trap 30, the pests climbing from the downstream side, and the like from reaching the watering device 41. Since the second folded-back portion 34 is at the highest position of the drain trap 30, the sealed water is the bottom of the second folded-back portion 34 (the second folded-back at the folded-back vertex of the second folded-back portion 34). The inner peripheral surface of the portion 34 does not accumulate above the lowest portion 34a.
Here, in this specification, the “water pool portion where drainage can be accumulated” means more specifically the height portion up to the water surface when the drainage (sealed water) is full in the portion. Therefore, “above the water reservoir portion” described later means above the water surface.

  A cylindrical cleaning port 36 for cleaning the water reservoir portion 37 is provided at the bottom of the first folded portion 32. A male screw part 36 a is formed on the outer periphery of the cleaning port 36. The cover 36b is attached to the cleaning port 36 by screwing the female screw portion 36c of the cover 36b into the male screw portion 36a. A packing 36d is sandwiched between the cover 36b and the cleaning port 36, and water is stopped so that the sealed water does not leak from the gap between the cover 36b and the cleaning port 36 through the cleaning port 36. Note that the position of the cleaning port 36 is not limited to the bottom of the first folded portion 32. The cleaning port 36 may be provided in another part of the drain trap 30.

  The second folded portion 34 is provided with a vent valve mounting portion 38 that opens upward. The ventilation valve (not shown) is a component that allows air from the outside to pass through the drain trap 30 and prevents the drain and air from passing through the drain trap 30 to the outside. Thereby, when a siphon force is generated and the amount of drainage is reduced to some extent, air is introduced to the downstream side of the drainage trap 30 through the vent valve. Thus, air does not flow in from the upstream side of the drain trap 30 through the water-circulating device 41, and the sealed water does not flow downstream with siphon force together with the air. That is, the so-called breaking phenomenon that the sealed water is lost from the water pool portion 37 does not occur.

  In the example of FIG. 2, the first drain pipe 42 has an inner diameter larger than that of the descending drain pipe 31 so that a larger amount of drainage can flow from the drain port 41 b. Further, the upstream drain pipe 33 has an inner diameter smaller than that of the downstream drain pipe 31, so that the siphon force can be generated more quickly. Furthermore, from the same viewpoint, the second drain pipe 43 has a smaller inner diameter than the down drain pipe 31. The second drain pipe 43 has a larger inner diameter than the upstream drain pipe 33.

Although not shown in FIG. 2, in the present embodiment, the second drain pipe 43 is configured as a part of the vent pipe 14 in the drain system 10 shown in FIG. 1. The second drain pipe 43 may be integrated with other parts of the vent pipe 14 to form the vent pipe 14, or a separate pipe body may be connected to the second drain pipe 43 to vent. A tube 14 may be formed.
In FIG. 1, for the sake of easy understanding, another reference numeral is attached and the drawing is somewhat simplified. However, the first drain pipe 42 and the drain trap 30 in FIG. Corresponding to the first drain pipe 12 and drain trap 13 in FIG.

(Vent pipe)
As shown in FIG. 2, in the present embodiment, the vent pipe 39 includes a lower opening end 39a and an upper opening end 39b positioned above the lower opening end 39a. Here, the lower open end 39a of the vent pipe 39 is located in the drain pipe 40 and above the water reservoir portion 37 upstream of the water reservoir portion 37 and upstream of the flow path FP. More specifically, in the present embodiment, the lower open end 39 a of the vent pipe 39 is located in the first drain pipe 42. More specifically, in the present embodiment, the lower opening end 39 a of the vent pipe 39 is located above the bottom 34 a of the second folded portion 34. Further, in the present embodiment, the lower open end 39a of the vent pipe 39 is located above the water pool portion 37 and below the highest position 34b on the inner peripheral surface of the second folded portion 34. Yes. Here, as in this example, when the second folded portion 34 is provided with an attachment member such as a vent valve mounting portion 38, “the highest position among the inner peripheral surfaces of the second folded portion. "Does not include the position on the inner peripheral surface of the accessory member.
In the present embodiment, the vent pipe 39 has an upper opening end 39b at the same height as the bottom surface 41a of the watering device 41 or above the bottom surface 41a of the watering device 41 (in the example of FIG. It is located above the bottom surface 41 a of the device 41.
As shown in FIG. 2, in this embodiment, the vent pipe 39 is smaller than the inner diameter of the first drain pipe 42 (in the example of FIG. 2, the first drain pipe 42, the down drain pipe 31, the up drain drain). The inner diameter of each of the pipe 33 and the second drain pipe 43 is smaller) and is made of a relatively thin pipe body. For example, stainless steel or vinyl chloride resin can be used as the material of the vent pipe 39. Further, a flexible material such as polyolefin resin may be used.

As the installation position of the ventilation pipe 39, it is only necessary that the lower opening end 39a and the upper opening end 39b are in the positions as described above, and various paths can be taken. For example, as shown in FIG. 2, a configuration in which most of the vent pipe 39 is accommodated in the drain pipe 40 (specifically, the first drain pipe 42 in the example of FIG. 2) may be used. Further, a part of the vent pipe 39 may be disposed outside the drain pipe 40 through the wall of the drain pipe 40 (specifically, the first drain pipe 42 in the example of FIG. 2). . Further, the path from the lower opening end 39a to the upper opening end 39b of the vent pipe 39 may be a path that rises all the time, or a path that descends halfway and rises again.
The lower opening end 39a and the upper opening end 39b of the ventilation pipe 39 do not have to be strictly directed downward and upward, but may be directed obliquely downward and obliquely upward. Further, the lower opening end 39a and the upper opening end 39b may face in the horizontal direction. In these cases, the positions of the lower opening end 39a and the upper opening end 39b are respectively the lowest positions of the opening ends.

  The vent pipe 39 inside the drain pipe 40 (specifically, the first drain pipe 42) is arranged along the inner wall of the drain pipe 40 (first drain pipe 42), for example, as shown in FIG. Can be installed. As a result, the position of the vent pipe 39 can be fixed, and installation is easy. In addition, when the drainage water flowing during use collides with the vent pipe 39, the vent pipe 39 is moved, which prevents the drainage from flowing out.

Next, the effect of the drain pipe structure according to the present embodiment will be described with reference to FIGS. 3 (A) and 3 (B). In FIGS. 3A and 3B, for convenience, the wall portion (meat portion) of each member is omitted and the drain pipe structure is schematically shown.
As shown in FIG. 3 (A), the drainage that has flowed from the watering device 41 is drained from the bottom of the watering device 41 to the drainage pipe 40 (in this embodiment, more specifically, the first drainage pipe 42). At that time, the first drain pipe 42 (more precisely, the portion of the drain pipe 40 that is upstream (that is, above) the reservoir portion 37) is filled with air. In the drain pipe structure of the present embodiment, the vent pipe 39 is provided, and the lower open end 39a thereof is in the drain pipe 40 and upstream of the water reservoir portion 37 in the drain pipe structure of this embodiment. Since the lower opening end 39a is not immersed in the drainage (sealed water) in the water pool portion 37, the air can be released. That is, as shown in FIG. 3 (B), the air compressed by passing through the lower opening end 39a of the vent pipe 39 so as to be pushed out by the drainage from the water-circulating device 41 passes through the upper opening of the vent pipe 39. Exit to end 39b. As a result, when the drainage flows downstream, air does not become resistance, and the drainage flows smoothly downstream. Furthermore, in the drain pipe structure of the present embodiment, the upper opening end 39b of the vent pipe 39 is located at the same height as the bottom surface 41a (see FIG. 2) of the watering device 41 or above the bottom surface 41a. The air on the upstream side (above) of the water pool portion 37 can be efficiently discharged to the outside of the drain pipe 40 (more specifically, in the present embodiment, the first drain pipe 42), and smoother. The drainage can flow into the drain pipe. Therefore, according to the drain pipe structure of the present embodiment, the drainage can flow smoothly.
In addition, when the drain pipe structure according to the present embodiment is applied to the drainage system 10 illustrated in FIG. 1, the drainage smoothly flows to the downstream side as described above, so that it is connected to the downstream side. The horizontal pulling tube 15 (see FIG. 1) is likely to be full of water. As a result, siphon force is easily generated, and rapid negative pressure can be generated.
From the viewpoint of more surely discharging the air upstream (upward) of the water reservoir portion 37 to the outside, as shown in FIG. It is preferable to be located above the bottom 34 a of the portion 34.

  Further, as shown in FIG. 2, in the drain pipe structure according to the present embodiment, the vent pipe 39 is housed in the drain pipe 40 and the watering device 41. In other words, the vent pipe 39 is entirely inside the drain pipe 40 and the watering device 41. For this reason, it is not necessary to make a construction in which a hole is made in the wall of the drain pipe 40 or the watering device 41 and the ventilation pipe 39 is passed, and the ventilation pipe can be attached by a simple construction.

  Further, as described above with reference to FIG. 2, in the drain pipe structure according to the present embodiment, the drain pipe 40 includes the first folded portion 32 and the second folded portion 34, and the water pool portion 37 is The lower opening end 39a of the vent pipe 39 is located above the water pool portion 37 and is the highest position on the inner peripheral surface of the second folded portion 34. It is located below 34b. Since the lower opening end 39a of the ventilation pipe 39 is located above the water reservoir portion 37, the lower opening end 39a is not immersed in the drainage (sealed water) in the water reservoir portion 37 as described above, and the water reservoir portion. 37, air on the upstream side (upper side) 37 can escape and the lower opening end 39a is positioned below the highest position 34b on the inner peripheral surface of the second folded portion 34. The open end 39a is located at a position close to the water surface of the drainage (sealed water) in the pool portion 37. For example, even if the drainage from the upstream side approaches the water surface, the upstream side of the pool portion 37 The air in the (upper) direction can still escape effectively. Therefore, according to the said structure, drainage can be poured more smoothly. Further, since the drain pipe 40 is configured to have the first folded section 32 and the second folded section 34, the drain pipe 40 can be applied to a drain pipe structure having a general S-shaped trap as the drain trap 30. Yes, it has a wide range of applications and is beneficial.

[First Modification]
FIG. 4 shows a first modification of the first embodiment of the present invention. In FIG. 4, for convenience, the wall portion (meat portion) of each member is omitted, and a part of the drain pipe structure is schematically shown. In the following drawings, the same members / portions as those in the first embodiment shown in FIGS. 2 and 3 are denoted by the same reference numerals, and the description thereof is omitted as appropriate.
In the present modification, the upper opening end 59b of the ventilation pipe 59 is above the planned water level 53 when the water-circulating device 41 is full, which is different from the example of FIG. Note that the position of the lower opening end 59a of the ventilation pipe 59 is the same as the position of the lower opening end 39a of the ventilation pipe 39 in the example of FIG. It exists in the inside of the 1st drain pipe 42 connected with the drain outlet 41b in the bottom face 41a. Since the upper opening end 59b of the vent pipe 59 is located above the planned water level 53 when the water-circulating device 41 is full, drainage does not enter from the upper opening end 59b of the vent pipe 59, and the water pool portion 37 (see FIG. 2). ) Does not hinder the action of the vent pipe 59 to release the air on the upstream side (above). Accordingly, since the drainage does not flow from the upper opening end of the vent pipe, the drainage can flow more smoothly.

  Here, the planned water level 53 when the water supply device 41 is full is a drain pipe 40 (in this example, specifically, the first drainage water) by covering the drain port 41b on the bottom surface 41a of the water supply device 41. When the drainage does not flow in the pipe 42), it means the water surface when the water is collected up to the position where the water collecting device 41 collects water. For example, in a watering device that does not have an overflow port for preventing overflow of water from the watering device 41, it is the height position of the upper end of the watering device 41. Further, for example, in a watering device having an overflow port for preventing overflow of water from the watering device, it is the height position of the lower end of the overflow port. In FIG. 4, for convenience, the overflow port is omitted, and the water level planned water surface 53 in FIG. 4 is the height position of the lower end of the overflow port.

In this modification, as shown in FIG. 4, the path of the vent pipe 59 passes through the first drain pipe 42 and the water-circulating device 41 that are part of the drain pipe 40. That is, similarly to the example of FIG. 2, also in this modification, the vent pipe 59 is housed in the drain pipe 40 and the water-circulating device 41. In other words, the vent pipe 59 is entirely inside the drain pipe 40 and the water supply device 41. For this reason, it is not necessary to make a construction such as making a hole in the wall portion of the drain pipe 40 or the watering device 41 and passing the vent pipe 59, and the vent pipe can be attached by a simple construction.
Furthermore, in this modified example, as shown in FIG. 4, the portion of the vent pipe 59 inside the water-circulating device 41 is installed in a form along the inner peripheral surface 41 c of the water-circulating device 41. Accordingly, the user does not get in the way of the ventilation pipe 59 during use of the watering device 41, and the ventilation pipe 59 can be easily fixed.

[Second Modification]
FIG. 5 shows a second modification of the first embodiment of the present invention. In the present modified example, the path in the vicinity of the upper opening end 69b of the ventilation pipe 69 is bent downward and folded, and the bent opening 69c causes the upper opening end 69b to face downward. This is mainly different from the first modification. The position of the lower opening end (not shown) of the ventilation pipe 69 is the same as the position of the lower opening end 39a of the ventilation pipe 39 in the example of FIG. It exists in the inside of the 1st drain pipe 42 connected with the drain outlet 61b in the bottom face 61a of the apparatus 61. FIG. Since the upper opening end 69b faces downward, even if drainage comes from the upper side of the upper opening end 69b, it becomes difficult to enter from the upper opening end 69b of the vent pipe 69. For this reason, it is difficult to hinder the action of the vent pipe 69 that allows the air on the upstream side (upper side) of the water reservoir portion 37 (see FIG. 2) to escape.
As shown in FIG. 5, the shape of the watering device 61 in this modification is a smooth hollow hemisphere, unlike the shape of the watering device 41 in the example of FIG. 2 and the first modification. However, in each embodiment and each modification of the present invention, the shape of the watering device is not particularly limited, and can be arbitrarily formed as long as it is not contrary to the object of the present invention.

Also in this modified example, as shown in FIG. 5, the path of the ventilation pipe 69 passes through the first drain pipe 42 (see FIG. 2) and the water-circulating device 61 that are part of the drain pipe 40. That is, similarly to the example of FIG. 2 and the first modification, also in this modification, the vent pipe 69 is housed in the drain pipe 40 and the water-circulating device 61. In other words, the vent pipe 69 is entirely inside the drain pipe 40 and the watering device 61. For this reason, it is not necessary to make a construction such as making a hole in the wall portion of the drainage pipe 40 or the watering device 61 and passing the ventilation pipe 69, and the ventilation pipe can be attached by a simple construction.
Furthermore, also in this modified example, as shown in FIG. 5, the portion of the vent pipe 69 inside the water-circulating device 61 is installed along the inner peripheral surface 61 c of the water-circulating device 61. Accordingly, the user does not get in the way of the vent pipe 69 while using the water supply device 61, and the vent pipe 69 can be easily fixed.

[Second Embodiment]
FIG. 6 is a cross-sectional view showing the drain pipe structure according to the second embodiment of the present invention in a state where the drain pipe structure is attached to a watering device. The water-circulating device 41, the drain trap 30, the first drain pipe 42, the water pool portion 37, and the like are the same as in the first embodiment. In the present embodiment, an eye plate 73 is attached to a drain outlet 41b on the bottom surface 41a of the water-circulating device 41, which is a connection point with the first drain pipe 42, so that no foreign matter flows in the drain pipe 40. ing. The eye plate 73 is detachable, and the eye plate 73 includes a rib 73a that supplements foreign matter, a drain hole 73b, and a through hole 73c. The drainage flows to the first drain pipe 42 through the drain hole 73 b of the eye plate 73. When foreign matter is included in the drainage, those having a size that cannot pass through the drainage hole 73 b are caught by the rib 73 a of the eye plate 73 and do not flow to the first drainage pipe 42. The drain hole 73b is smaller in size than a foreign substance that is not desired to flow through the drain pipe 40. The drain holes 73b may be at least in one place of the eye plate 73 (that is, if there is only one drain hole), but in consideration of drainage performance, there are a plurality of places (that is, the drain holes are not provided). More than one) is preferred.

  In the present embodiment, a vent pipe 79 is connected to the eye plate 73. More specifically, the vent pipe 79 is connected to the through hole 73c of the eye plate 73 having the through hole 73c attached to the drain port 41b of the bottom surface 41a of the water-circulating device 41. The operational effects achieved by providing the vent pipe 79 are the same as those in the first embodiment. Further, in the present embodiment, since the vent pipe 79 is connected to the through hole 73c of the eye plate 73, the vent pipe 79 can be simply attached to the drain port 41b on the bottom surface 41a of the watering device 41. Can be attached, and the ventilation pipe 79 can be attached by a simple method. Further, by removing the eye plate 73, the ventilation pipe 79 is also removed, and cleaning becomes easy.

FIG. 7 is a perspective view showing the vent pipe connected to the eye plate together with the eye plate. As shown in FIG. 7, according to the present embodiment, the vent pipe 79 is connected to, for example, a through hole 73 c provided in the center of the eye plate 73. Further, there are a plurality of (eight in the example of FIG. 7) drain holes 73b surrounding the through hole 73c, and the drainage flows from there to the drain pipe. Further, a foreign substance larger than the drainage hole 73b is caught by the rib 73a and stays on the eye plate 73 without flowing into the drainage hole 73b. In the present embodiment, the position of the through hole 73 c to which the vent pipe 79 is connected is the center of the eye plate 73, but may be a position other than the center of the eye plate 73.
Further, the drain hole 73b can have various shapes. For example, as shown in FIG. 7, a plurality of opening holes extending radially around the through hole 73c may be provided, or a plurality of circular opening holes may be provided so as to surround the periphery of the through hole 73c. Furthermore, the number of drain holes 73b may be one.

The upper open end 79 b of the ventilation pipe 79 is preferably protruded from the upper surface of the eye plate 73. In this case, since the upper open end 79b of the vent pipe 79 is higher than the drain hole 73b, the drainage easily flows into the drain hole 73b located at a position lower than the upper open end 79b of the vent pipe 79. It becomes difficult for drainage to flow into the trachea 79. Further, as shown in FIGS. 6 and 7, even if the upper open end 79 b of the vent pipe 79 does not protrude from the upper surface of the eye plate 73, a wall 73 d is formed so that drainage does not enter the periphery of the vent pipe 79. By providing the eye plate 73 so as to surround the periphery, it is possible to make it difficult for drainage to flow into the vent pipe 79.
When the upper open end 79b of the vent pipe 79 is higher than the through hole 73c, the upper open end 79b is connected to the water as in the first modification of the first embodiment described with reference to FIG. If the device 41 is above the planned water level when the water is full, the drainage will not flow from the upper opening end 79b of the vent pipe 79, and the operation of the vent pipe 79 will not be hindered. Further, as in the second modification of the first embodiment described with reference to FIG. 5, when the upper opening end 79 b is bent downward and the upper opening end 79 b faces downward, This is advantageous in that drainage is difficult to enter from the upper opening end.

The form of connection of the vent pipe 79 to the through hole 73c of the eye plate 73 is not particularly limited. For example,
The ventilation pipe 79 may be molded and formed integrally with the eye plate 73 or may be connected as a separate body. In the case of a separate body, it is easy to remove the ventilation tube 79 from the eye plate 73 and clean it. Further, for example, a threaded portion can be provided in the vent pipe 79 and the eye plate 73 so that they can be fixed to each other by screwing, or can be connected to each other by various means such as adhesion using an adhesive. it can.

  As described above, the present invention can be applied to siphon drainage systems, but can also be applied to conventional drainage systems other than siphon drainage systems. Further, in each of the above embodiments, the case where the drain trap is a so-called S-shaped trap has been described as an example, but the present invention can also be applied to the case where other types of drain traps are used.

The present invention can be applied to a drain pipe structure connected to various watering devices.

10: Drainage system 11, 41, 61: Water supply device 12, 42: First drain pipe (drain pipe)
13, 30: Drain trap 14: Vent pipe (drain pipe)
15: Horizontal pipe (drain pipe)
16: Drainage pipe (drainage pipe)
17: Drainage pipe 18: Junction joint 20: Floor slab 21: Piping hole 31: Down drainage pipe (drainage pipe)
32: First folded portion (drainage pipe)
33: Up-drain pipe (drain pipe)
34: Second folded portion (drainage pipe)
34a: bottom part 34b of the second folded part: the highest position on the inner peripheral surface of the second folded part
36: Cleaning port 37: Water reservoir portion 38: Vent valve attachment portions 39, 59, 69, 79: Vent pipes 39a, 59a, 79a: Lower open ends 39b, 59b, 69b, 79b: Upper open ends 40: Drain pipe 41a : Bottom 41b: Drain port 43: Second drain pipe (drain pipe)
53: Planned water surface 73 when full of water 73: Eye plate 73a: Rib 73b: Drainage hole 73c: Through hole 73d: Wall
FP: Flow path

Claims (5)

A drain pipe connected to a drain outlet on the bottom surface of the watering device and having a flow path for draining water;
A water reservoir portion provided in the middle of the flow path of the drain pipe, where drainage can accumulate,
A vent pipe having a lower open end and an upper open end positioned above the lower open end,
The lower opening end of the vent pipe is located in the drain pipe and is located above the water pool portion on the upstream side of the flow path from the water pool portion, and the upper opening end of the vent pipe is the water circulation device. A drainage pipe structure, wherein the drainage pipe structure is located at the same height as the bottom surface of the water or above the bottom surface of the watering device.   The drain pipe structure according to claim 1, wherein an upper opening end of the vent pipe is located above a planned water surface when the water-circulating device is full.   The drain pipe structure according to claim 1 or 2, wherein the vent pipe is housed in the drain pipe and in the watering device.   The drainage according to any one of claims 1 to 3, wherein the vent pipe is connected to the through hole of an eye plate having a through hole attached to the drain outlet on the bottom surface of the watering device. Tube structure. The drain pipe is connected to the downstream side of the flow path of the first folded portion and the first folded portion, as it goes to the downstream side of the flow path, and then turns upward from the downward direction. A second folded portion that is folded upward and then downward,
The water pool portion is configured to include the first folded portion,
5. The lower opening end of the vent pipe is located above the water pool portion and is located below the highest position on the inner peripheral surface of the second folded portion. 6. The drainage pipe structure described in 1.

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