JPH09268618A - Bent pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove bubbles generated in a lateral pipe by drain by arranging a guide vane in a bent pipe for connecting a drain vertical pipe to the drain lateral pipe and guiding the drain flowing through the drain vertical pipe so as to make it into a swirling flow in the lateral pipe. SOLUTION: A drain lateral pipe 4 is connected to the bottom part of a drain vertical pipe 1 arranged vertically through respective floors of a building via a drain catch pipe 2 and a bent pipe 3. In this case, the connecting part 3A of a drain vertical pipe 1 is arranged in the top end of the bent pipe 3 and its intermediate part is bent so that the other end is set to a connecting part to the lateral pipe 4. A guide vane 3a which guides the drain flowing down in the drain vertical pipe 1 and sets it into a swirling flow in the lateral pipe 4 is provided inside the bent pipe 3. The guide vane 3a is extended in the axial direction of the bent pipe 3 and arranged into a twisted state so as to gradually shift to the circumferential direction as the drain shifts to the axial downstream side. This constitution makes the drain into the swirling flow in the upstream side of the drain lateral pipe 4 by the guide vane 3a, effectively flow down bubbles filled in the lateral tube 4, and then eliminates the bubbles so as to prevent abnormal pressure rising.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vent pipe for connecting a drainage vertical pipe and a drainage horizontal pipe.

[0002]

2. Description of the Related Art In a high-rise building or the like, bubbles due to a detergent or the like block the inside of a horizontal main pipe (a drain horizontal pipe connected to the lower end of the drain vertical pipe) that is connected to a drain vertical pipe that runs through each floor. If the so-called bubble plug phenomenon occurs, thereafter, the air that is caused to flow together with the drainage in the drain pipe may stay in the bubble plug portion, causing an abnormal pressure increase in the upstream pipe.

[0003]

When the pressure in the pipe is abnormally increased as described above, the pressure in the horizontal branch pipe connected to the middle portion of the drainage vertical pipe is also increased. Therefore, the toilet bowl or the sink connected to the horizontal branch pipe In the trap part of the
May cause offensive odor. Therefore, an object of the present invention is to provide a vent pipe capable of controlling the flow of drainage so as to wash and remove bubbles generated in the drainage horizontal pipe by drainage.

[0004]

In order to achieve the above object, the present invention provides a drain pipe that connects drainage vertical pipe and drainage horizontal pipe with drainage that has flowed down in the drainage vertical pipe. Guide vanes are provided to guide the swirl flow. Therefore, even if the inside of the horizontal drainage pipe is temporarily filled with bubbles, the sequentially flowing wastewater is guided by the guide plate in the vent pipe,
The drainage becomes a swirl flow in the drainage horizontal pipe, and the bubbles filled up to the upper side are removed by the drainage, so that abnormal pressure increase in the pipe is prevented.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a drainage horizontal main pipe 4 (drainage horizontal pipe) is provided through a drainage collecting pipe 2 and a vent pipe 3 at a lower end portion of a drainage vertical pipe 1 which is vertically installed so as to vertically penetrate each floor of a building. Are connected.

The vent pipe 3 is provided with a connecting portion 3A of the drainage vertical pipe 1 at its upper end, the middle portion is bent by approximately 90 °, and the other end is a connecting portion 3B of the horizontal drainage pipe 4. In addition, guide blades 3 a are provided on the inner surface of the vent pipe 3 so as to guide the drainage flowing down in the drainage vertical pipe 1 into a swirling flow in the drainage horizontal main pipe 4. The guide vanes 3a extend in the axial direction of the vent pipe 3 and are provided in a twisted shape so as to move in the circumferential direction as they move downstream in the axial direction. The guide vane 3a may be provided in a single number or a plurality of numbers.

Therefore, on the upstream side of the drainage horizontal main pipe 4,
Due to the action of the guide vanes 3a in the vent pipe 3, the drainage becomes a swirl flow, and the bubbles filling the inside of the horizontal main pipe 4 can be efficiently pushed out and eliminated by such drainage, and abnormal pressurization can be prevented. Above the drainage horizontal main pipe 4, an air supply device 7 (fluid delivery device) for ejecting pressurized air from an ejection port 6 at the tip of the nozzle pipe 5 by an air pump is arranged. The jet port 6 is positioned on the upper side of the horizontal main pipe 4 inside the pipe, and pressurized air (pressurized fluid) is directed toward the downstream side.
The vent pipe 3 is arranged so as to eject
In addition to the defoaming action by the above, it is possible to more reliably prevent abnormal pressure increase in the pipe due to filling of the pipe with bubbles.

A pressure detector 8 for detecting the pressure inside the pipe is attached to an appropriate position upstream of the position where the nozzle end (jet port) 6 of the air supply device 7 is positioned with respect to the horizontal main pipe 4. The detector 8 is electrically connected to an automatic controller 9 that operates the air supply device 7 when the detected pressure reaches a preset abnormal pressure rise level. A pressure switch such as a diaphragm valve can be used as the pressure detector 8. In this case, the air supply device 7 can be automatically started without using the automatic controller 9. In addition,
The air supply device 7 can be manually operated and stopped.

When the automatic controller 9 determines an abnormal pressure rise with respect to the pressure value detected by the pressure detector 8, the automatic controller 9 is configured to automatically operate the air supply device 7. There is. Therefore, pressurized air is blown into the horizontal main pipe 4 along the direction of urging the drainage flow, and the pushing force is exerted on the foam plug portion on the downstream side of the ejection port 6 at the nozzle end, and the ejection port is also ejected. The drawing force acts on the foam plug portion on the upstream side of 6 and blows them off to the downstream side to secure a ventilation path in the upper portion of the horizontal main pipe 4.

The automatic controller 9 automatically stops the air supply device 7 after a predetermined time elapses after it is determined that the abnormal pressurization has been eliminated or after the operation of the air supply device 7 is started. The detection value of the detector 8 is monitored. The drainage collecting pipe 2 is provided with a drainage pipe joint 10 at the upper end in the pipe axial direction and a vent pipe joint 11 at the lower end in the pipe axial direction, and has a large-diameter portion having a larger diameter than the drainage vertical pipe 1 at the upper portion. 12 is provided, and a tapered pipe portion 13 is formed between the large diameter portion 12 and the vent pipe joint portion 11. In addition, on the inner surface of the tapered pipe portion 13, the swirl vanes 13 that generate swirl flow are formed.
a is provided. It is preferable that the swirl vanes 13a are arranged in such a position that the drainage flows smoothly and efficiently with respect to the guide vanes 3a of the vent pipe 3.

A branch pipe joint portion 14 is provided on the large-diameter portion 12 so as to project laterally, and a drainage horizontal branch pipe 16 having a trap portion 15 is connected to the branch pipe joint portion 14. An intake valve 20 for sucking outside air into the pipe when the pipe internal pressure becomes negative is provided at an appropriate position of the drain horizontal branch pipe 16 near the drain collecting pipe 2, and the air supply device 7 is activated to start the jet port 6 When the compressed air is jetted from the inside of the horizontal main pipe 4 toward the downstream side, so that the inside of the drainage vertical pipe 1 and the lateral branch pipe 16 on the upstream side of the jet outlet 6 becomes negative pressure, the intake valve 20 operates. Since the outside air is sucked into the pipe by opening it, it is possible to prevent the inside of the pipe from having a large negative pressure. Therefore, it is possible to prevent the sealing water trap of the lateral branch pipe 16 from being broken and improve the smoothness of drainage. it can.

As shown in FIG. 2, the intake valve 20 has an intake pipe 21 whose lower end is connected to the lateral branch pipe 16 and which extends upward.
And a box body 22 that surrounds the upper end of the intake pipe 21, and a valve body 23 that is an annular plate that is fitted onto the outer periphery of the intake pipe 21 in the box body 22 so as to be vertically movable. The box 22 is
It has a hollow cylindrical shape, and the bottom plate 22A has a cylindrical valve seat 25.
Is projected upward, and the valve seat 25 and the fitting hole 24 are provided.
A plurality of ventilation holes 26 are provided between and.

When the pressure in the intake pipe 21 is equal to or higher than the atmospheric pressure, the valve body 23 is normally pressed by the valve seat 25 to maintain the closed state, and the pressure in the intake pipe 21 becomes lower than the atmospheric pressure. , Which is pushed up by the atmospheric pressure (indicated by a chain double-dashed line in FIG. 2), and the atmosphere passes through the ventilation hole 26 and the inside of the box 22 to the intake pipe 2
1 is sucked in, flows into the collecting pipe 1 and the pressure rises,
Negative pressure is released.

The present invention is not limited to the above-mentioned embodiment, but any guide vanes provided in the vent pipe can be used as long as the guide vanes have a function of turning the drainage into a swirling flow in the drainage lateral pipe. It may have a shape. Further, the intake valve may be provided in the vicinity of the upstream end of the horizontal main pipe or in the collecting pipe, and as the fluid ejection device 7, a device that ejects water from the ejection port 6 toward the downstream side may be adopted. .

[0015]

As described above, according to the present invention,
Even if the drainage horizontal pipe is temporarily filled with bubbles, the drainage that flows sequentially is guided by the guide plate in the vent pipe, and the drainage becomes a swirl flow in the drainage horizontal pipe, and the drainage fills the upper side. Bubbles can be removed, and abnormal pressurization in the pipe can be prevented by effectively using the drainage.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a drainage pipe system according to an embodiment of the present invention.

[Explanation of symbols]

 1 Drainage Vertical Pipe 3 Vent Pipe 3a Guide Blade 4 Drainage Horizontal Pipe (Horizontal Main Pipe)

Claims (1)

[Claims] 1. A vent pipe connecting a drainage vertical pipe (1) and a drainage horizontal pipe (4), wherein drainage that has flowed down in the drainage vertical pipe (1) is in the drainage horizontal pipe (4). Guide vanes (3
A vent pipe characterized in that a) is provided in the pipe.