JP2003213751A - Joint device for drain pipes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a joint device for drain pipes, which can be arranged in a space-saving manner without requiring a stack vent pipe, ensures ventilation in the pipes of the entire drainage system, and exerts drainage backflow preventive effect. <P>SOLUTION: The joint device for the drain pipes is arranged near an intersection between an upper edge of a drainage riser 2 and a horizontal pipe 3, and a joint body 6 functions to connect the drainage riser 2 to the horizontal pipe 3. The interior of the joint body 6 is formed into a double pipe structure, and a venting mechanism 30 is connected to an inner channel 46 of the double pipe, followed by connecting the horizontal pipe 3 to an outer channel 45 at a location at which a lower edge of the inner channel of the double pipe falls within an inner diameter of the horizontal pipe 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage pipe joint device, and more particularly to a drainage pipe joint device provided at a connection position between a drainage stack pipe and a horizontal pipe provided in a drainage facility.

[0002]

2. Description of the Related Art Conventionally, in a drainage facility for a building, drainage flowing from a drainage device such as a washbasin or a kitchen is drained from a drainage port of the drainage device to a drainage stand pipe which is erected up and down the structure through a drainage branch pipe. It flows, but in this case, a negative pressure is generated in the drain pipe. If negative pressure is generated in the drainage pipe, the sealing function of the trap water provided in each drainage device may not function properly, so generally use a vent pipe to reduce the negative pressure. I have to.

The vent valve is used together with the vent pipe to reduce the negative pressure in the drain pipe by taking in air into the vent pipe when the valve is open. It is necessary to set it up so that it rises 150 mm or more from the overflow edge of the highest drainage equipment in. The reason for this is to prevent leakage of water from this ventilation valve should the valve function be impaired, and to provide a check function when installing the ventilation valve in this way. This is because the vent valve is usually installed at a position higher than the overflow edge to prevent backflow of drainage. In general, an apex vent pipe is provided above the drainage vertical pipe, and a vent valve is attached to the tip of the apex vent pipe so that the drainage does not leak unnecessarily.

This ventilation valve has been mainly used in an apartment house such as a condominium where it is easy to secure a pipe space consisting of an installation space for an apex ventilation pipe, but in recent years, it has also been adopted in a detached house. There is a tendency.

On the other hand, the ventilation valve type with a check valve mechanism is usually installed in a cabinet that is easy to inspect because of its reliability, and cannot be installed under the floor or in a wall. That is, this vent valve is installed directly on the drainage device so that it is positioned below the overflow edge of each drainage device. It is necessary to provide a check valve mechanism to prevent this.

[0006]

However, when a vent valve is provided at the tip of the apex vent pipe, a wide pipe space is required to install the apex vent pipe, and in particular, the vent valve in a detached house is required. When mounting, it is difficult to secure this pipe space, so the pipe diameter may be reduced or the use of complicated bent pipes may be forced. On the contrary, there was a risk that the air permeability would deteriorate, leading to a ventilation failure. Further, when the pipe space required for installation becomes large in this way, there is a problem that the living space is limited accordingly.

On the other hand, in the case of a vent valve type with a check valve mechanism, it is difficult to install it under the floor or in the wall, and it is possible to install it for each drainage device and deal with it individually, but the drainage system as a whole Cannot be sufficiently ventilated.

Further, when the ventilation valve is provided for each drainage device, it is necessary to inspect each ventilation valve, and there is a problem that management is troublesome.

The present invention has been developed as a result of intensive studies in view of the above-mentioned circumstances, and its object is to install it in a space-saving manner without the need for an apex vent pipe. An object of the present invention is to provide a joint device for drainage pipes, which can ensure ventilation in the pipes of the entire drainage facility and can exert the effect of preventing backflow of drainage.

[0010]

In order to achieve the above-mentioned object, the invention according to claim 1 is arranged in the vicinity of an intersecting position of an upper end position of a drainage stack and a horizontal pipe, and a drainage pipe is constructed by a joint body. And the horizontal pipe are connected to each other, and the inside of this joint body has a double pipe structure, and the ventilation mechanism is connected to the inner flow path of the double pipe, and the lower end of the inner pipe of the double pipe is set to the inner diameter of the horizontal pipe. At such a position, it is a drainage pipe joint device in which a lateral pipe is connected to the outer flow path.

According to a second aspect of the present invention, the drainage vertical pipe and the horizontal pipe are connected to each other by a joint body, which is arranged near the upper end position of the drainage vertical pipe and the crossing position of the horizontal pipe. It is a joint device for drainage piping provided with a ventilation mechanism having an air layer for preventing backflow.

According to a third aspect of the present invention, the ventilation mechanism includes:
A drainage pipe joint device that is a ventilation valve provided with a valve body that normally seats on the annular valve seat by its own weight in the valve chamber having outer and inner annular valve seats and that opens in response to negative pressure by atmospheric pressure. is there.

According to a fourth aspect of the present invention, there is provided a drainage pipe joint device, wherein the backflow preventing air layer is formed by providing a cylindrical body having a predetermined length at an inflow position of the ventilation mechanism.

According to a fifth aspect of the present invention, there is provided a drainage pipe joint device in which the vertical drainage pipe and the horizontal pipe are connected at a position where the axial center of the horizontal pipe is eccentric with respect to the axial center of the vertical drainage pipe.

According to a sixth aspect of the invention, the drainage vertical pipe and the horizontal pipe are connected by a joint body arranged near the upper end position of the drainage vertical pipe and the crossing position of the horizontal pipe, and the inside of the joint body is This is a joint device for drainage pipes having a heavy pipe structure, the outer flow path of this double pipe being a drainage path, and the inner flow path being a ventilation path communicating with the atmosphere.

According to a seventh aspect of the present invention, there is provided a drainage pipe joint device in which the vertical drainage pipe and the horizontal pipe are connected at a position where the axial center of the horizontal pipe is eccentric with respect to the axial center of the vertical drainage pipe.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a joint device for drainage piping according to the present invention will be described in detail with reference to the drawings. In FIG. 3, reference numeral 1 is a drainage facility provided in a building such as a detached house or an apartment house, 2 is a drainage stand pipe constituting the drainage facility 1, and 3 is a horizontal pipe. It is a horizontal drain pipe. Further, 4 is an equipment drainage pipe for allowing the drainage flowing from the equipment 5 such as a bathroom, a washbasin, a kitchen sink, and a toilet bowl to flow down to the horizontal pipe 3, and a trap 4a is provided in the middle of the flow path.

Reference numeral 6 denotes a joint body according to the present invention. The joint body 6 is a drainage vertical pipe 2 and a horizontal pipe 3 which are arranged in accordance with the number of floors of a building and the like. As shown in FIG. 1, the drainage vertical pipe 2 and the horizontal pipe 3 are connected to the annular connecting cylinders 8 and 9 provided in the main body at positions near the intersection with the pipe 3 to form a flow path. A ventilation mechanism 30 capable of forming an air layer C for preventing backflow is provided inside the joint body 6. In this example, the joint body 6 is connected to the drainage vertical pipe 2 and the horizontal pipe 3 so as to be fitted into the connecting tubular portions 8 and 9, respectively. The appropriate connection means may be used. The drainage vertical pipes 2 and the horizontal pipes 3 located at other than the upper end are connected by an ordinary joint member 7 to form another flow path of the drainage facility 1.

The ventilation mechanism 30 is a ventilation valve provided to reduce the negative pressure generated in the drainage equipment 1. The valve chamber 10 of the ventilation valve 30 is defined by the cylindrical portion 11 of the joint body 6. , The inner annular valve seat 1 concentrically with the cylindrical portion 11
2 and the outer annular valve seat 13 are formed. Each of these valve seats forms a complete ring. Further, a disc-shaped cap 14 is fitted and provided in the upper opening 11a of the cylindrical portion 11, and the guide shaft 1 is provided at the center of the lower surface of the cap 14.
5, the guide shaft 15 is formed with a plurality of radial projections 15a in the radial direction. The joint body 6, the cap 14 and the lifting member 19 described later are made of synthetic resin in this example.

In the valve chamber 10, a valve body 16 is provided so as to be able to move up and down. Normally, the valve body 16 is seated on the annular valve seats 12 and 13 by its own weight, and when the inside of the pipe becomes a negative pressure, it responds to it. Then, it is lifted by the atmospheric pressure and opened. The valve body 16 may have any structure as long as it exhibits these functions, but the valve body 16 in this example has a circular guide hole 17 in the central portion and a plurality of communication holes 18. A mounting groove 19a is formed on the outer peripheral surface of a circular elevating member 19 having a circular shape, and an annular flexible member 20 formed of a material such as rubber is attached to the mounting groove 19a. The guide shaft 15 is fitted to
When the valve body 16 moves up and down while being guided by the shaft 15 and is seated on the annular valve seats 12 and 13 due to the weight of the valve body 16, the flexible member 20 is pressed against the annular valve seats 12 and 13. The valve is closed in the closed state. Further, as shown in the drawing, the guide shaft 15 is suspended to a position below the annular valve seats 12 and 13, and the outer diameter of the flexible member 20 is smaller than the inner diameter of the cylindrical portion 11. The cylindrical part 11
It is provided so as not to come into contact with.

Further, an air inlet 21 communicating with the atmosphere is provided between the annular valve seats 12 and 13, and a plurality of holding pieces 22 are provided between the annular valve seats 12 and 13 in the radial direction. There is.

Further, an annular water collecting groove 24 for collecting the condensed water in the valve chamber 10 is formed on the outer peripheral portion outside the outer annular valve seat 13, and in this embodiment, the communicating groove 24 is connected. Although the structure is formed so as to incline downward until reaching the flow path 23, it may be provided horizontally and may be arbitrary depending on the implementation. With this water collecting structure, since the collected dew condensation water can be drained straight in the direction of the drainage stack 2, the drainage efficiency is good, and the use of a heat insulating material for suppressing the dew condensation in the valve chamber can be omitted. Have merits. The vent valve mechanism is an example, and it goes without saying that it can be applied to various other vent valves.

The air layer C formed in the ventilation mechanism 30 for preventing backflow can be formed by providing a cylindrical body 32 having a predetermined length at the inflow position of the ventilation mechanism 30. In the present embodiment, the tubular body 32 is formed integrally with the ventilation mechanism 30 separately from the tubular body 12a extending from the annular valve seat 12, and the inlet 32b is formed on the inflow side of the tubular body 32. The inflow port 32b is provided so as to be positioned lower than the lower edge of the inner diameter of the horizontal pipe 3, and a ventilation path 36 that allows communication from the tubular body 32 to the ventilation mechanism 30 is provided therein. For example, when the drainage is clogged and the water level tries to rise to the inside of the joint body 6, if the inflow port 32b is blocked by this drainage, the air layer C in the tubular body 32 can be kept in a sealed state.

Reference numeral 32a denotes a taper portion, and the outer cylinder portion 31 and the cylinder body 32 are integrally molded via the taper portion 32a,
The inside of the joint body 6 has a double pipe structure, and a drainage channel 35 is formed in an outer flow path of the double pipe.

Further, the drainage system 1 in this example is constructed so that the drainage stand 1 is eccentric with respect to the axis of the drainage standpipe 2, that is, the axis of the cylindrical body 32, as shown in FIG. The pipe 2 and the horizontal pipe 3 are connected to each other, and in the joint body 6, the connecting tubular portion 9 that is a connection portion with the horizontal pipe 3 is formed at a position eccentric from the axial center. Therefore, when the drainage flows from the horizontal pipe 3 into the drainage channel 35, the drainage flows along the inner wall of the outer tubular portion 31 and thus flows down in the drainage channel 35 as a swirling flow.

In this way, by causing the drainage to flow down as a swirl flow, an air core is naturally formed in the vicinity of the axial center in the joint body 6, so that the air supply to the drainage stand pipe 2 is secured and The drainage from the pipe 3 is smoothly performed.
Further, in the present invention, since the inner tube is ventilated by the tubular body 32, the air core can be more forcibly formed in the joint body 6, and the smooth drainage can be surely performed.

Here, FIG. 15 is a schematic cross-sectional view showing a comparative example in the vicinity of a conventional ventilation pipe, in which drainage is caused to flow in the inner cylindrical portion 32A and air is blown between the outer cylindrical portion 31A and the inner cylindrical portion 32A. It has a passage. In this case, the drainage is the inner cylindrical portion 32A.
This drainage blocks the passage of air when flowing out from the outside, and the drainage diffuses and becomes a gas-liquid mixed state,
Flow may be obstructed. In the present invention, as shown in FIG. 7, since the drainage flows down along the inner wall of the outer tubular portion 31 to the drainage stand pipe 2, the drainage can be smoothly performed without blocking the passage of the air. .

Next, the operation of the above embodiment will be described. The drainage flowing out from the instrument 5 to the horizontal pipe 3 via the instrument pipe 4 is the drainage in the joint main body 6 arranged at the position near the upper end position of the drainage vertical pipe 2 and the horizontal pipe 3 in the building. Road 35
Run down to. The drainage becomes a swirl flow as described above, and flows down in the drainage channel 35 along the inner wall of the outer tubular portion 31.

At this time, since the inflow port 32b of the cylindrical body 32 is provided so as to be located at least at the inner diameter of the lateral pipe 3, and more preferably at a position lower than the lower end of the inner diameter of the lateral pipe 3, the drainage is cylindrical. It does not flow back into the body 32. Therefore, the operation of the ventilation mechanism 30, that is, the ventilation valve is not affected, and the drainage can be prevented from flowing out through the ventilation mechanism 30.

When a negative pressure is generated in the drainage facility 1 during drainage, the ventilation valve 30 is actuated according to the pressure difference between the negative pressure and the atmospheric pressure to open the valve, and the atmosphere is drained. It is taken in and the negative pressure is reduced. When the pressure difference becomes small, the ventilation valve 30 is closed, and the odor in the drainage facility 1 is not released to the atmosphere.

The drainage flows back through the drainage equipment 1, and the joint body 6
When the drainage rises from the drainage standpipe 2 side into the inside of the container, when the inflow port 32b is blocked by this drainage, the air layer C formed by the tubular portion 32 becomes a closed state,
The drainage does not flow back into the cylindrical body 32, and the ventilation mechanism 30
It is possible to prevent the drainage from flowing out through the. In this case, positive pressure acts on the ventilation valve 30,
The valve closed state is maintained.

Here, an example of calculation of the compressibility of the air layer C when the drainage rises inside the joint body 6 from the drainage stack 2 side will be shown. In FIG. 4, the inlet 32b of the cylindrical body 32
The internal volume of the main body 6 from the inside to the ventilation mechanism 30 is defined as the ventilation valve internal volume D.
c, 1 atm, the floor distance from the installation position of the main body 6 (not shown) to the floor is 30 cm, and the floor distance from the floor to the overflow edge is 90 cm.
The distance to the overflow edge of is assumed to be 120 cm. At this time, 120 cmAq = 1.12 at the inlet 32b.
Since the pressure of m is applied, the air layer C is 1000 ÷ 1.1
2≈892 (cc). That is, even when the inflow port 32b is blocked by the drainage and the air layer C in the ventilation valve section is sealed, the air layer C is only compressed by about 12%. Even if the drainage flows into, the inflow of the drainage into the ventilation mechanism 30 does not occur.

As described above, in the drainage pipe joint device of the present invention, the drainage from the horizontal pipe 3 and the backflow of the drainage from the drainage vertical pipe 2 are both discharged to the ventilation mechanism 30. Since the backflow can be prevented and the wastewater does not flow out from the joint device to the outside, by installing only the joint body 6, it is possible to reduce the negative pressure of the entire drainage facility 1 while preventing the backflow of the wastewater. it can.

As described above, by providing the main body 6 in the vicinity of the intersecting position of the drainage vertical pipe 2 and the horizontal pipe 3, it is possible to install without the extension vent pipe, and a wide pipe space is not required. Since the installation location can be made small, it can be installed in a narrow pipe space. Moreover, the main body 6 can be installed at a position below the overflow edge of the interior of the room, and by incorporating the ventilation mechanism 30 into one body, this small joint main body is particularly suitable for a detached house or an apartment house. By providing the drainage facility 1 using the 6th, it becomes possible to provide a wide living space.

Further, while the joint body 6 is provided inside the building, ventilation of the entire drainage system 1 can be centralized, and there is no need to provide a separate check valve. Since it is not necessary to consider ventilation obstruction due to function, frequent inspections are not required and management becomes easy. Also,
Highly reliable. In addition, at the time of inspection, it is possible to easily perform the inspection from this inspection port by opening the openable opening 1a provided above the main body 6, and further, the ventilation mechanism 30 with the opening 1a opened. If the cap 14 is removed together with the valve body 16, the drainage vertical pipe 2 and the horizontal pipe 3 can be opened, and the opening can be used as a cleaning port.

FIG. 8 is a cross-sectional view showing a second embodiment of the drainage pipe joint apparatus of the present invention, in which the annular valve seat 12 is provided without providing the tubular body 32 and the tapered portion 32a in the first embodiment. The inside of the joint main body 26 has a double pipe structure by the cylindrical body 12a extending downward. In the second embodiment, parts having the same functions as those of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, the inlet 12b of the cylindrical body 12a
Is provided so as to be located below the lower edge of the inner diameter of the lateral pipe 3 as in the case of the first embodiment, and the valve chamber 10 is provided on the outer peripheral portion of the outer annular valve seat 13. An annular water collecting groove 24 and a communication flow path 23 for collecting the dew condensation water therein are formed, and the communication flow path 23 directly communicates with a drainage path 35 on the outer circumference of the double pipe. FIG. 9 is a cross-sectional view of the cylindrical portion 11 of FIG. 8 taken along the line EE, showing this water collecting structure.

The drainage flowing down from the horizontal pipe 3 becomes a swirling flow in the drainage channel 35 as in the first embodiment.
Flow down along the inner wall of the cylinder, and at this time, it does not flow back into the cylindrical body 12a, and drainage does not flow out through the ventilation mechanism 30.

Even if drainage flows back into the drainage facility 1 and rises from the drainage stack 2 side inside the joint body 26, the communication passage 2 is shown as shown by the hatched portion in FIG.
By forming the closed air layer F when the drainage rises to 3, the backflow of the drainage to the ventilation mechanism 30 can be prevented. However, the capacity of the air layer F is smaller than that when the cylinder 32 is separately provided as in the first embodiment.

FIG. 11 is a cross-sectional view showing a third embodiment of the drainage pipe joint apparatus of the present invention. In the figure, 37 is the joint body in this embodiment. In the drawing, the drainage vertical pipe 2 and the horizontal pipe 3 are connected by a joint body 37 arranged near the upper end position of the drainage vertical pipe 2 and the crossing position of the horizontal pipe 3, and a tubular pipe is provided inside the joint main body 37. The double pipe structure is provided with the body 42, the outer flow passage of this double pipe is a drainage passage 45, and the inner flow passage is a ventilation passage 46 communicating with the atmosphere. Note that 43
Is a cylindrical connecting portion provided on the upper portion of the cylindrical outer cylindrical portion 41 forming the main body. In the present embodiment, the cylindrical body 42 is
Is integrally formed so as to hang from the connecting portion 43.

Reference numerals 48 and 49 denote connecting cylinders integrally formed with the main body 6, which include the connecting cylinder 48, the drainage stand pipe 2, and
The connecting tube portion 49 and the horizontal pipe 3 are connected to form a flow path. At this time, the horizontal piping 3 with respect to the axial center of the drainage vertical piping 2
The drainage vertical pipe 2 and the horizontal pipe 3 are connected to each other at a position where the axis of the is eccentric.

Reference numeral 38 denotes a connecting member such as an elbow. One end of the connecting member 38 is fitted and connected to the connecting portion 43, and the other end is connected to a tubular connecting vent pipe 39. Further, the other end of the connection ventilation pipe 39 is communicated with the outside air of the building through the wall surface W or the like to form a ventilation passage from the main body 37. Reference numeral 40 is a louver provided in the open to the atmosphere.

Since the joint main body 37 has a double pipe structure in which the outer flow path is the drainage path 45 and the inner flow path is the ventilation path 46 communicating with the atmosphere, as in the above-described embodiment, the horizontal piping 3 When the drainage flows into the drainage channel 45, the ventilation channel 46 is not blocked by this drainage, and the drainage channel 45 can be drained without hindering the ventilation from the ventilation channel 46. Moreover, the drainage can be made to flow by the swirling flow along the inner wall of the outer tube portion 41 which is the outer tube due to the surface tension, and the inner core can positively form the air core at the drainage center in the drainage stand pipe 2. Since it is carried out automatically, a smoother flow can be created.

Further, in addition to ventilating from the wall surface W, the connecting portion 43 of the joint main body 37 can be connected with, for example, an apex vent pipe to provide a vent valve at its tip. The main body 37 can be applied to any place so that the pipe is breathable.

FIG. 12 is a sectional view showing a fourth embodiment of the drain pipe joint apparatus of the present invention. Reference numeral 47 denotes a joint body, and in the present embodiment, an outer cylinder portion 48 of this joint body 47.
The cylindrical body 49 was inserted in the upper part of the above through the seal member 50.
Reference numeral 51 denotes an insertion portion provided inside the tubular body 49, and the ventilation pipe 5 is inserted into the insertion portion 51 as shown in FIGS.
5 or the ventilation valve 56 can be connected in common, and the ventilation pipe 55 and the ventilation valve 56 can be appropriately selected and used according to the actual usage pattern, and a conventional ventilation valve for the apex ventilation pipe can be used. It can also be used. Reference numeral 52 is an O-ring for sealing the space between the ventilation pipe 55 or the ventilation valve 56 and the insertion portion 51.

[0046]

As described above, according to the joint device for drainage pipes of the present invention, the joint for connecting the drainage vertical pipe and the horizontal pipe is provided with the air permeability without providing the updraft pipe. It can be installed in a small space,
It is possible to adjust the negative pressure of the entire drainage facility to ensure air permeability in the pipe, and to exert the effect of preventing backflow of drainage.

In particular, when the drainage tends to flow back into the joint body, letting the drainage flow out to the outside can be surely prevented by letting the valve body fit more closely, let alone preventing the backflow into the body. .

Further, the drainage pipe joint device of the present invention does not need to be provided with a separate vent valve, and therefore does not require a top vent pipe.

When the drainage flows into the main body, the backflow into the ventilation mechanism is prevented, and the backflow prevention structure prevents the drainage from scattering to the ventilation mechanism and effectively prevents the backflow of the drainage to the ventilation mechanism. At the same time, the flow during drainage can be cleared.

Further, the drainage is swirled to form an air core to clear the flow of the drainage so as to improve the air permeability in the drainage stand pipe, and the adherence of dirt to the inner wall of the pipe is also prevented. Can be prevented.

On the other hand, when connecting the vertical drainage pipe and the horizontal pipe, it is a joint device for drainage pipes having higher ventilation, and a joint device for drainage pipes capable of smoothly draining water. In this case, the drainage can be swirled to facilitate the flow.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an example of a joint device for drainage piping according to the present invention.

FIG. 2 is an external view of the drainage pipe joint apparatus of the present invention as seen from the direction of the arrow in FIG.

FIG. 3 is a schematic explanatory view showing the entire drainage pipe.

FIG. 4 is a vertical cross-sectional view showing a state in which drainage flows backward from the drainage stack pipe side into the joint device for drainage pipes of the present invention.

5 is a cross-sectional view taken along the line AA of FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a schematic sectional view showing the vicinity of the ventilation pipe of the present invention.

FIG. 8 is a vertical sectional view showing a second embodiment of the joint device for the drainage pipe of the present invention.

9 is a cross-sectional view of the cylindrical portion of FIG. 8 taken along the line EE.

FIG. 10 is a schematic vertical cross-sectional view showing a state in which drainage flows backward from the drainage stack piping side into the joint device for drainage piping in FIG.

FIG. 11 is a longitudinal sectional view showing a third embodiment of the drainage pipe joint apparatus of the present invention.

FIG. 12 is a vertical cross-sectional view showing a fourth embodiment of the drainage pipe joint apparatus of the present invention.

FIG. 13 is a vertical cross-sectional view showing a state in which a ventilation pipe is connected to the joint device for the drainage pipe in FIG.

14 is a vertical cross-sectional view showing a state in which a ventilation valve is connected to the joint device for the drainage pipe in FIG.

FIG. 15 is a schematic cross-sectional view showing the vicinity of a conventional ventilation pipe.

[Explanation of symbols]

2 Drainage plumbing 3 horizontal piping 6, 37 Joint body 10 valve chamber 12, 13 Annular valve seat 16 valve body 30 Ventilation mechanism (vent valve) 32 cylinder 45 Drainage channel (outer channel) 46 Ventilation passage (inner passage) C air layer

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kazunori Saku             2040 Nagasaka-Kamijo, Nagasaka-machi, Kitakoma-gun, Yamanashi Prefecture             Kitz Nagasaka factory F term (reference) 2D061 AA04 AB04 AC02 AC06 AC07                       AC08 AD01

Claims (7)

[Claims] 1. A drainage vertical pipe and a horizontal pipe are connected to each other by a joint body, which is arranged near the intersection of the upper end position of the drainage vertical pipe and the horizontal pipe, and the inside of the joint body has a double pipe structure. The inner pipe of the double pipe is connected to the ventilation mechanism, and the outer pipe is connected to the lateral pipe at a position where the lower end of the inner pipe of the double pipe overlaps the inner diameter of the lateral pipe. Drainage pipe joint device. 2. An air layer for preventing backflow is disposed in the vicinity of the intersection of the upper end position of the drainage vertical pipe and the horizontal pipe to connect the drainage vertical pipe and the horizontal pipe in the joint body, and to prevent backflow inside the joint main body. A joint device for drainage pipes, which is provided with a ventilation mechanism having a. 3. The vent mechanism comprises a valve body, which is normally seated on the annular valve seat by its own weight and which is opened by atmospheric pressure in response to negative pressure, in a valve chamber having outer and inner annular valve seats. The drainage pipe joint device according to claim 1, which is a ventilation valve. 4. The drainage pipe joint device according to claim 2, wherein the backflow preventing air layer is configured by providing a cylindrical body having a predetermined length at an inflow position of the ventilation mechanism. . 5. The drainage pipe according to claim 1, wherein the drainage vertical pipe and the horizontal pipe are connected at a position where the axis of the horizontal pipe is eccentric with respect to the axis of the drainage vertical pipe. Fitting device. 6. The drainage vertical pipe and the horizontal pipe are connected by a joint body arranged near the upper end position of the drainage vertical pipe and the intersection of the horizontal pipe, and the inside of the joint body has a double pipe structure. A joint device for drainage pipes, wherein the outer flow path of the double pipe is a drainage path and the inner flow path is a ventilation path communicating with the atmosphere. 7. The drainage pipe joint according to claim 6, wherein the drainage vertical pipe and the horizontal pipe are connected at a position where the axis of the horizontal pipe is eccentric to the axis of the drainage vertical pipe. apparatus.