JPH09273195A - Antifoaming device for drain horizontal pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove bubbles by forming a nozzle electing a pressure fluid on the upper side in a drain horizontal pipe connected to the lower section of a drain riser and installing a suction valve sucking the outside air into the pipe when the inside of the pipe on the stream side upper than the nozzle reaches a negative pressure. SOLUTION: A pressure detector 8 detects in-pipe pressure on the upstream side of a drain horizontal main pipe 4, and transmits a detected signal to an automatic controller 9. The automatic controller 9 operates an air blower 7 when the in-pipe pressure reaches a preset abnormal step-up level. Pressure air is ejected towards the downstream side from a nozzle 6 for the nozzle pipe 5 of the air blower 7 in the horizontal main pipe 4. Pushing force works to a foam plug section on the stream side lower than the nozzle 6 and drawing force to a foam plug section on the stream side upper than the nozzle 6 respectively, the foam plug sections are blown off, and a ventilation path is ensured in an upper section in the horizontal main pipe 4. When a drain riser 1 on the stream side upper than the nozzle 6 and the inside of a horizontal branch pipe 16 further reach negative pressure, a suction valve 20 is opened and the outside air is sucked into the pipe, and the breaking of a drain trap for the horizontal branch pipe 16 is prevented.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a defoaming device for a horizontal drain 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, and the pressure in the upstream pipe may be abnormally increased.

[0003]

When the pressure in the pipe is abnormally increased as described above, the pressure in the horizontal branch pipe connected to the drainage vertical pipe is also increased. Therefore, the trap portion of the toilet bowl or sink connected to the horizontal branch pipe In such cases, there is a risk of spouting of sealing water and generation of a foul odor. As a means for solving such a problem, by ejecting a pressurized fluid from a jet port provided on the upper side in the horizontal main pipe toward the downstream side, the bubbles generated in the horizontal main pipe are blown off, and the pressurized fluid is discharged to the upper side of the horizontal main pipe. It is considered to secure a ventilation part.

By the way, conventionally, by swirling the drainage flowing down in the drainage vertical pipe and causing it to flow along the pipe wall by centrifugal force, an air core serving as a ventilation pipe is generated in the center of the drainage vertical pipe, The air pressure fluctuation in the drainage vertical pipe is kept small to prevent breakage of sealing water in the trap of the lateral branch pipe.However, when the pressurized fluid is jetted toward the downstream side as described above, it is upstream of the jet outlet. The inside of the pipe becomes a negative pressure temporarily, and this negative pressure causes a problem of breaking the trap water of the lateral branch pipe.

Therefore, in the present invention, bubbles generated in the drainage horizontal pipe can be removed by the pressurized fluid jetted toward the downstream side in the drainage horizontal pipe, and a negative pressure is provided upstream of the jet outlet. It is an object of the present invention to provide a defoaming device that can prevent the occurrence of such bubbles.

[0006]

In order to achieve the above object, the defoaming device for a horizontal drain pipe of the present invention is provided on the upper side in the horizontal drain pipe connected to the lower portion of the vertical drain pipe and is provided on the downstream side. It is provided with an ejection port for ejecting a pressurized fluid toward the pipe, and an intake valve for injecting outside air into the pipe when the inside of the pipe upstream of the ejection port has a negative pressure.

That is, when the pressurized fluid is jetted from the jet outlet toward the downstream side, the bubbles filling up to the upper side of the drain horizontal pipe are blown away to secure the ventilation passage, and prevent abnormal pressure rise in the pipe. Further, even if the pressure inside the pipe becomes negative on the upstream side of the ejection port by ejecting the pressurized fluid, the intake valve opens and the outside air is taken into the pipe, and the negative pressure is immediately eliminated.
It is also possible to prevent the trouble of breaking the trap water of the lateral branch pipe.

[0008]

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 is connected via a drainage collecting pipe 2 and a bend pipe 3 to a lower end portion of a drainage vertical pipe 1 which is vertically erected so as to vertically penetrate each floor of the building. .

The defoaming device of this embodiment is an air supply device 7 (fluid delivery device) which is arranged above the drainage horizontal main pipe 4 and blows pressurized air from the jet port 6 at the tip of the nozzle pipe 5 by an air pump. ) Is provided. The jet port 6 is positioned on the upper side of the horizontal main pipe 4 inside the pipe, and is arranged so as to jet pressurized air (pressurized fluid) toward the downstream side. A pressure detector 8 for detecting the pressure inside the pipe is attached to an appropriate position upstream of the portion where the nozzle end (jet port) 6 of the air supply device 7 is positioned with respect to the horizontal main pipe 4. An automatic controller 9 that electrically operates the air supply device 7 when the detected pressure reaches a preset abnormal boosting level is electrically connected to the. 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. The air supply device 7 can be manually operated and stopped.

When the automatic controller 9 determines an abnormal pressure increase 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 drainage flow P in a direction of energizing the flow, and a pushing force is again applied to the foam plug portion on the downstream side of the jet end 6 at the nozzle end. The drawing force acts on the foam plug portion on the upstream side of the outlet 6, blows them off to the downstream side, and an air passage is secured in the upper portion of the horizontal main pipe 4.

The automatic controller 9 automatically stops the air supply device 7 after determining that the abnormal pressurization has been eliminated or after the elapse of a predetermined time after the operation of the air supply device 7, and the pressure control device 9 again starts the operation. The detection value of the detector 8 is monitored. The drainage collecting pipe 2 is provided with a drainage pipe joint portion 10 at the upper end in the pipe axial direction and a bend pipe joint portion 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 bend pipe joint portion 11.

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
A hollow cylindrical cylindrical valve seat 25 concentric with the hole 24 is provided on the outer peripheral side of the intake pipe fitting hole 24 of the bottom plate 22A so as to project upward, and the valve seat 25 and the fitting hole 24 are also provided. A plurality of ventilation holes 26 are provided between and.

If the internal pressure of 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 internal pressure of 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.

FIG. 3 shows another embodiment of the intake valve 20,
A box 22 is connected to the upper end of the intake pipe 21 in a communicating manner, a valve seat 25 also serving as an air introducing tube is provided in a penetrating manner on a top plate 22B of the box 22, and formed into a substantially hemispherical shape by an elastic material such as rubber. The valve body 23 is fitted in a convex shape upward, and the valve body 2
A ventilation cutout portion 27 is provided on the outer periphery of the device 3. Therefore, when the pressure in the intake pipe 21 becomes a negative pressure, the valve body 23 moves to the position shown in FIG.
Is deformed as shown by the two-dot chain line and separated from the valve seat 25, the atmosphere is sucked from the valve seat 25 into the box 22, passes through the ventilation cutout 27 of the valve body 23, and flows from the intake pipe 21 to the lateral branch pipe 16 Flows in and the negative pressure is released.

The present invention is not limited to the above-described embodiment. For example, the intake valve is located upstream of the ejection port 6 and in the middle of the pipeline to the trap at the most downstream portion where breakage must be prevented. It can be provided in the vicinity of the upstream end of the horizontal main pipe or in the collecting pipe. Further, as the fluid ejection device 7, a device that ejects water from the ejection port 6 toward the downstream side can be adopted.

[0017]

As described above, according to the present invention,
Bubbles generated in the horizontal drain pipe can be eliminated by the pressurized fluid ejected from the ejection port, abnormal pressure rise inside the pipe can be prevented, and by ejecting the pressurized fluid, the upstream side of the ejection port Even if the inside of the pipe becomes negative pressure, the outside air is taken in from the intake valve and the negative pressure is immediately eliminated, and there is a problem such as breaking the sealing water trap of the side branch pipe connected to the upstream side of the drainage horizontal pipe. Can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view showing an entire embodiment of the present invention.

FIG. 2 is a vertical sectional view showing an embodiment of an intake valve.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the intake valve.

[Explanation of symbols]

 1 Drainage vertical pipe 4 Horizontal drainage pipe (horizontal main pipe) 6 Jet outlet 20 Intake valve

Claims (1)

[Claims] 1. A jet port (6) for jetting a pressurized fluid toward a downstream side, which is provided on an upper side of a horizontal drain pipe (4) connected to a lower portion of the vertical drain pipe (1), A defoaming device for a horizontal drain pipe, comprising: an intake valve (20) for sucking outside air into the pipe when the pressure in the pipe upstream of the ejection port (6) becomes negative.