JP7429635B2 - siphon drainage system - Google Patents

Description

The present invention relates to a siphon drainage system equipped with a storage tank that temporarily stores and discharges wastewater.

For example, as shown in Patent Document 1, in a drainage system that utilizes the siphon force of a siphon drain pipe, a storage tank is provided between a plumbing fixture and a horizontal draw pipe of the siphon drain pipe, and the drainage from the plumbing fixture is siphoned. A configuration is known in which the water is temporarily stored in a storage tank until the start of the process. In the drainage system shown in Patent Document 1, for example, when a bathtub is drained, the wastewater discharged from the bathtub flows into a storage tank. The waste water that flows into the storage tank flows through the horizontal pipe of the siphon drainage pipe, and then flows into the vertical pipe.

In a siphon drain pipe, siphon force does not occur unless the vertical pipe is full of wastewater and falls inside the vertical pipe, so until siphon force occurs, the amount of wastewater from the siphon drain pipe is equal to the amount of wastewater flowing into the storage tank. The water level of the wastewater in the storage tank rises because it is smaller than the wastewater volume. After that, when the vertical pipe becomes full of wastewater and a siphon force is generated, the amount of water discharged by the siphon drain pipe exceeds the amount of wastewater flowing into the storage tank, and the water level of the wastewater decreases.

Japanese Patent Application Publication No. 2017-190626

By the way, the siphon drain pipe in which the siphon force is generated sucks the waste water in the storage tank. Therefore, when the water level in the storage tank falls to a certain extent, the water level near the siphon drain pipe may drop to a level close to the siphon drain pipe, and the siphon drain pipe may suck in the air inside the storage tank.

When the siphon drain pipe sucks in the air inside the storage tank along with the waste water, an abnormal noise is generated, which resonates in the air layer of the storage tank. When abnormal noise resonates in the air layer of the storage tank, it may cause the walls of the storage tank to vibrate, and the abnormal noise may eventually be emitted to the outside of the storage tank. Therefore, in Patent Document 1, in order to suppress the above-mentioned abnormal noise, a ventilation section is provided that allows air from outside the storage tank to flow into the inside of the siphon drain pipe, and the air is sucked downstream from the storage tank. The suction force acting on the waste water in the storage tank is moderately reduced. This prevents air from being sucked into the storage tank through the opening of the siphon drain pipe, thereby suppressing the generation of abnormal noise inside the storage tank.

However, in Patent Document 1, air from outside the storage tank is constantly allowed to flow into the inside of the siphon drain pipe to weaken the siphon force, so there is a concern that the drain capacity may decrease.

In view of the above-mentioned facts, the present invention aims to suppress the generation of abnormal noise within the storage tank while maintaining the drainage capacity by siphon force.

The siphon drainage system according to claim 1 includes: a storage tank for storing wastewater flowing in from an inlet; a horizontal pipe connected to the storage tank and laterally discharging the wastewater from the storage tank; a vertical pipe which is disposed downstream of the horizontal draw pipe and generates a siphon force by causing the waste water from the horizontal draw pipe to flow down; an opening at one end is connected to the horizontal draw pipe; An air supply pipe having an opening disposed in the storage tank, an intake hole formed on a side surface of the pipe vertically lower than the upper end of the inlet, and allowing air in the storage tank to flow into the horizontal drawing pipe. The air supply pipe includes an air supply upstream portion that extends such that the opening on the other end side is at the bottom in the vertical direction .

In the siphon drainage system according to the first aspect, when waste water flows into the storage tank, the waste water is temporarily stored in the storage tank. The wastewater that has flowed into the storage tank flows into the vertical pipe via the horizontal draw pipe, and when the full flow of wastewater falls inside the vertical pipe due to gravity, a siphon force is generated. When a siphon force is generated, the wastewater in the storage tank is sucked toward the vertical pipe, and the wastewater flows down in a full flow, allowing for rapid and efficient drainage.

By the way, when wastewater flows into the storage tank, in the initial state where the inside of the vertical pipe is not yet full, siphon force is not generated. The amount of water discharged by the pipe per unit time is small, and the water level of the wastewater rises in the storage tank.

When the vertical pipe becomes full and a siphon force is generated, the inside of the horizontal pipe becomes negative pressure, and the waste water from the storage tank is sucked and drained from the opening of the horizontal pipe provided in the storage tank to the horizontal pipe. At the same time, drainage water also flows from the air supply pipe into the horizontal draw pipe, making it possible to efficiently drain water using siphon force.

This siphon force continues until the water level drops to the intake hole vertically below the upper end of the inlet of the reservoir. Therefore, when the water level in the storage tank is such that the equipment drain pipe connected upstream of the inlet is blocked, drainage can be performed without reducing the siphon force, and drainage can be promoted. Note that when the water level in the storage tank is sufficiently high, no air is sucked in from the opening of the horizontal draw pipe, so no abnormal noise is generated due to this.

When the water level in the storage tank drops to near the intake hole of the air supply pipe due to drainage caused by the siphon force, air enters from the intake hole and flows into the horizontal draw pipe via the air supply pipe. As a result, drainage by the siphon force continues, but the suction force decreases. By reducing the suction force, suction of air from the opening of the horizontal drawing pipe can be suppressed, and generation of abnormal noise inside the storage tank can be suppressed.

Note that the "lateral direction" in "a horizontal draw pipe that discharges wastewater in a horizontal direction" is not limited to the horizontal direction, but also includes a slight inclination (for example, 5 degrees or less).

In the siphon drainage system according to claim 2, in the siphon drainage system according to claim 1, the opening on the other end side of the air supply pipe is wider than the connection opening of the horizontal drawing pipe to the storage tank. It is located vertically above the storage tank.

In the siphon drainage system according to claim 2, after the water level decreases as drainage progresses due to the siphon force, and the suction force decreases due to the inflow of air from the intake hole, when the water level further decreases, the water level decreases from the connection opening of the horizontal draw pipe. Before the intake of air, air intake starts from the opening at the other end of the air supply pipe. This allows more air to flow into the horizontal draw pipe when the water level is low, reducing the suction force of the siphon and suppressing noise caused by air being sucked in from the connection opening of the horizontal draw pipe. be able to.

In the siphon drainage system according to claim 3, a plurality of the intake holes are formed at the same height in the vertical direction.

According to the siphon drainage system according to claim 3, by forming a plurality of intake holes, the size of each intake hole can be reduced to ensure the necessary amount of intake air, and the formation of the intake holes can be reduced. It can be done easily.

In the siphon drainage system according to a fourth aspect of the present invention, the air supply upstream portion extends in a vertical and oblique direction, and the intake hole is formed on the upper surface side of the pipe side surface.

According to the siphon drainage system according to the fourth aspect, since the air flowing in from the intake hole moves along the inner wall surface of the upstream part of the air supply, drainage can flow smoothly in the air supply pipe.

According to the siphon drainage system of the present invention, it has an excellent effect of being able to suppress the generation of abnormal noise in the storage tank while maintaining the drainage capacity by siphon force.

BRIEF DESCRIPTION OF THE DRAWINGS It is a side view which shows the whole structure of the siphon drainage system based on this embodiment. It is a sectional view showing a storage tank of the siphon drainage system and the inside thereof according to the present embodiment. FIG. 3 is a close-up view of a hole in the upstream part of the air supply of the siphon drainage system according to the present embodiment. (A) explaining the drainage of the siphon drainage system according to the present embodiment; (B) showing a state in which the water level has risen more than in (A); and (C) showing a state in which the water level has risen more than in (B). It is a diagram. (D) shows a state in which the water level is lower than that in FIG. 4(C), which explains the drainage of the siphon drainage system according to the present embodiment, (E) shows a state in which the water level rises more than in FIG. ) is a diagram (F) showing a state in which the water level is higher than that of FIG. It is a sectional view showing a storage tank of a siphon drainage system and the inside thereof according to a modification of the present embodiment.

A siphon drainage system 10 according to an embodiment of the present invention will be described using the drawings. The siphon drainage system 10 according to the present embodiment is a drainage system that efficiently discharges wastewater from plumbing fixtures using siphon force.

As shown in FIG. 1, a floor panel 16 is arranged above the slab 14 of the building 12 with a space therebetween. Plumbing equipment 17 is arranged on the floor panel 16. The plumbing fixture 17 is, for example, a bathtub, a kitchen sink, a dishwasher, etc., for draining water, but it may also be a washbasin, a bathroom waterproof pan, etc.

The plumbing fixture 17 is connected to one end of a pipe 18 through which waste water discharged from the plumbing fixture 17 flows. Note that the pipe 18 is, for example, a pipe made of vinyl chloride, but may be made of other synthetic resin.

(Storage tank)
As also shown in FIG. 2, a storage tank 20, which forms part of the siphon drainage system 10, is arranged above the slab 14.

The storage tank 20 can temporarily store waste water from the plumbing fixture 17, and is formed in a box shape. The storage tank 20 has a substantially rectangular parallelepiped shape, and a top plate 20A and a bottom plate 20B are inclined downward in the direction of arrow L in the drawing. The storage tank 20 is made of, for example, a synthetic resin material such as vinyl chloride.

An inflow port 18A is formed in one side wall 20C of the storage tank 20 in the direction of arrow R in the drawing, and the other end of the pipe 18 is connected thereto. It is configured such that the drainage water from the water fixture 17 flows into the storage tank 20 via the pipe 18. An outflow port 22A serving as a connection opening is formed on the lower side of one side wall 20C of the storage tank 20 and the other side wall 20D on the side in the direction of arrow L in the drawing, which faces the side wall 20C. One end of a pipe 22 is connected to the outlet 22A. The inlet 18A is arranged vertically above the outlet 22A.

An inspection port 20E is formed in the top plate 20A of the storage tank 20. The inspection port 20E is closed with a lid 21 that can be opened and closed. Further, one end of a ventilation pipe 23 is connected to the top plate 20A. The other end of the ventilation pipe 23 is connected to a vertical pipe 28 (see FIG. 1) via a merging joint 29 (see FIG. 1), which will be described later.

The piping 22 and the ventilation pipe 23 are, for example, made of vinyl chloride, but may be made of other synthetic resins.

The pipe 22 is inclined downward in the direction of arrow L. A T-shaped joint 24 is arranged at the other end of the pipe 22. The T-shaped joint 24 includes a first connection portion 24A to which the piping 22 is connected, a second connection portion 24B located on the opposite side of the first connection portion 24A, and a connection between the first connection portion 24A and the second connection portion 24B. A third connecting portion 24C is provided between the third connecting portions 24C and extending upward perpendicular to the direction connecting the first connecting portions 24A and the second connecting portions 24B. The first connecting portion 24A and the second connecting portion 24B are provided coaxially, and the center line CL of the first connecting portion 24A and the second connecting portion 24B is inclined downward in the direction of the arrow L. ing.

The distance DL from the intersection P of the center line CL1 of the first connection part 24A of the T-shaped joint 24 and the center line CL2 of the second connection part 24B to the inner surface of the storage tank 20 is the distance DL between the intersection P and the storage tank 20 during drainage. It is only necessary to set the drainage route between the tank and the storage tank 20 so that it is full of drainage, and the pipe 22 may be abolished and the T-shaped joint 24 may be directly connected to the storage tank 20 so that the distance DL is shortened. The piping 22 may be made longer than in FIG. 2 so that the distance DL becomes longer.

Although the T-shaped joint 24 is made of, for example, vinyl chloride, it may be made of other synthetic resins.

(siphon drain pipe)
A siphon drain pipe 26 that constitutes a part of the siphon drain system 10 is connected to the second connecting portion 24B of the T-shaped joint 24. The siphon drain pipe 26 includes a horizontal pipe 26A and a vertical pipe 26B. The upstream end of the horizontal drawing pipe 26A is connected to the second connecting portion 24B. A portion of the horizontal draw pipe 26A near the T-shaped joint 24 is inclined, but the downstream side thereof is disposed horizontally on the slab 14 without any slope. As shown in FIG. 1, the vertical pipe 26B extends continuously downward (vertically downward) from the downstream end of the horizontal draw pipe 26A, and its downstream end is connected to a merging joint 29, which will be described later.

Although the siphon drain pipe 26 of this embodiment is made of polybutene, it may be made of other flexible synthetic resin.

In this embodiment, the horizontally drawn pipe 26A, the area from the first connecting portion 24A to the second connecting portion 24B of the T-shaped joint 24, and the piping 22 correspond to the horizontally drawn pipe of the present invention.

A vertically extending vertical pipe 28 is provided in the building 12. A merging joint 29 is attached to the vertical pipe 28, and the waste water discharged through the siphon drain pipe 26 is discharged to the vertical pipe 28 via the merging joint 29.

An air supply pipe 30 is connected to the third connection portion 24C of the T-shaped joint 24. The air supply pipe 30 is composed of a pipe with a diameter similar to or smaller than the siphon drain pipe 26, and includes an air supply upstream section 32, an air supply midstream section 34, and an air supply downstream section 36. ing. The air supply downstream portion 36 has an opening 36A on one end side (one end side of the air supply pipe 30) connected to the third connecting portion 24C, and extends upward. The air supply midstream section 34 extends from the upstream end of the air supply downstream section 36 toward the storage tank 20, penetrates the side wall 20D, and extends into the storage tank 20.

The air supply upstream section 32 is arranged at an angle so as to approach the bottom plate 20B as it goes in the direction of arrow R from the tip of the air supply midstream section 34 disposed in the storage tank 20. The opening 32A at the tip of the air supply upstream section 32 (the other end side of the air supply pipe 30) is arranged vertically above the upper end E2 of the outlet 22A. Further, the opening 32A is arranged at a position overlapping the inspection port 20E when viewed from above.

An intake hole 32B is formed in the side wall of the air supply upstream section 32. As shown in FIG. 2, the intake hole 32B is formed below the upper end E1 of the inlet 18A and above the opening 32A. Further, the intake hole 32B is formed at a position that is visible from the upper surface side of the side wall of the air supply upstream portion 32 that is arranged at an angle, in other words, from the upper surface. Furthermore, a plurality of intake holes 32B (two in this embodiment) are formed at the same height in the vertical direction. The opening cross-sectional area of the intake hole 32B is set smaller than that of the opening 32A.

(action, effect)
Next, the functions and effects of the siphon drainage system 10 of this embodiment will be explained.
Drainage from the plumbing fixture 17 flows into the storage tank 20 via the pipe 18 (see FIG. 4(A)).

The bottom plate 20B of the storage tank 20 is inclined so that the siphon drain pipe 26 side is lower than the pipe 18 side into which the waste water flows, so that the waste water flows inside the storage tank 20 from the pipe 18 side to the siphon drain pipe 26. (outlet 22A side) and begins to accumulate from the siphon drain pipe 26 side, and the water depth on the siphon drain pipe 26 side becomes deeper than on the piping 18 side (see FIG. 4(B)).

Then, as the wastewater flows into the storage tank 20 and the water level of the wastewater in the storage tank 20 rises, the air in the storage tank 20 is pushed, and the ventilation pipe 23 connected to the top plate 20A of the storage tank 20, and is discharged into the vertical pipe 28 via the merging joint 29. This allows wastewater to flow into the storage tank 20 quickly and efficiently.

When wastewater flows into the storage tank 20, in the initial state where the vertical pipe 26B of the siphon drain pipe 26 is not yet full, the siphon force is not generated, so the amount of water flowing into the storage tank 20 per unit time is Compared to the amount of drainage, the amount of drainage per unit time by the siphon drain pipe 26 is small, and the water level of the drainage in the storage tank 20 rises.

When the inside of the vertical pipe 26B of the siphon drain pipe 26 becomes full and the waste water falls inside the vertical pipe 26B due to gravity, a siphon force is generated due to the potential energy of the siphon water head Hs. When the siphon force is generated, the waste water in the storage tank 20 is sucked through the outlet 22A, and the speed of water drainage increases. Further, when the siphon force is generated, if the water level of the waste water in the storage tank 20 is higher than the intake hole 32B, the waste water in the storage tank 20 is also sucked from the intake hole 32B and the opening 32A, and passes through the air supply pipe 30. and is sent to the siphon drain pipe 26 (see FIG. 4(C)).

In addition, if the water level becomes higher than the upper end E1 of the inlet 18A, there is a concern that drainage will accumulate in the piping 18 and affect the plumbing fixtures 17, so a siphon force is generated before the water level reaches the upper end E1 of the inlet 18A. The setting is such that drainage from the storage tank 20 is promoted.

As shown in FIG. 4(C), when the water level of the wastewater in the storage tank 20 is higher than the intake hole 32B, the intake hole 32B and the opening 32A are arranged below the water surface, so No air suction occurs. Therefore, drainage can be promoted without reducing the siphon force.

As shown in FIG. 5(D), when the water level of the wastewater in the storage tank 20 becomes lower than the intake hole 32B, air A is taken into the siphon drain pipe 26 from the intake hole 32B via the air supply pipe 30. . As a result, the siphon force is appropriately reduced, and the suction force acting on the waste water in the storage tank 20 is appropriately reduced. At this time, since the siphon force continues to act on the waste water, the discharge speed of the waste water in the storage tank 20 is faster than when the siphon force is not acting.

As shown in FIG. 5(E), when the water level of the wastewater in the storage tank 20 further decreases to near the opening 32A, the suction force from the air supply pipe 30 partially lowers the water surface near the opening 32A. The air A is sucked into the air supply pipe 30 through the opening 32A. At this time, the siphon force is moderately reduced and the suction force is weakened due to the inflow of air A from the above-mentioned intake hole 32B, so that it is possible to suppress the generation of abnormal noise due to air suction.

Then, the water level of the waste water in the storage tank 20 further decreases, the waste water no longer flows into the air supply pipe 30, only air A flows into the air supply pipe 30, and the amount of air A flows into the siphon drain pipe 26 increases, The siphon force is further reduced. As a result, the suction force acting on the waste water in the storage tank 20 is further reduced. Therefore, even if the water level in the storage tank 20 drops to near the outlet 22A of the piping 22 (see FIG. 5(F)), the water level near the outlet 22A will partially drop and the air in the storage tank 20 will be Inhalation can be suppressed and the generation of abnormal noise can be suppressed.

In the siphon drainage system 10 of this embodiment, drainage continues with normal siphon force until the water level in the storage tank 20 drops to the intake hole 32B vertically lower than the upper end E1 of the inlet 18A. Therefore, when the water level in the storage tank 20 is such that the pipe 18 connected upstream of the inlet 18A is blocked, drainage can be performed without reducing the siphon force, and drainage can be promoted. .

Furthermore, when the water level in the storage tank 20 falls to the intake hole 32B, air A is allowed to flow in through the intake hole 32B, thereby reducing the suction force while continuing drainage by the siphon force. Before the air A is sucked in, the air A is made to flow in from the opening 32A. As a result, the siphon force can be reduced in two stages, suppressing the occurrence of abnormal noise due to suction of air A from the outlet 22A, and ensuring drainage capacity according to the water surface height (water storage amount). I can do it.

Furthermore, in the siphon drainage system 10 of the present embodiment, even if the water level in the storage tank 20 drops to near the outlet 22A while a siphon force is being generated, air A is supplied to the horizontal drawing pipe 26A from the opening 32A. As a result, the suction force is reduced, thereby suppressing the suction of air from the opening of the horizontal drawing pipe, and suppressing the generation of abnormal noise inside the storage tank.

In this embodiment, the air supply upstream portion 32 of the air supply pipe 30 is arranged at an angle so as to approach the bottom plate 20B as it goes in the direction of the arrow R from the tip, but as shown in FIG. It may be arranged as follows. As in this embodiment, the inclined arrangement allows drainage and air to flow smoothly within the air supply pipe 30.

Further, in the present embodiment, the intake holes 32B are formed on the upper surface side of the side wall of the air supply upstream section 32 arranged at an angle, but they do not necessarily need to be formed on the upper surface side, and may be formed on the lower surface side. By forming it on the upper surface side as in this embodiment, the air A is prevented from crossing the inside of the pipe of the air supply upstream section 32 in the radial direction, and drainage and air can flow smoothly.

Further, in this embodiment, two intake holes 32B are formed, but the number of intake holes 32B may be one or three or more. By providing a plurality of intake holes 32B as in this embodiment, the intake holes 32B can be formed more easily than when using large intake holes.

Furthermore, in this embodiment, the opening 32A of the air supply upstream section 32 is arranged at a position overlapping the inspection port 20E when viewed from above, so that maintenance and inspection of the air supply upstream section 32 can be easily performed from the inspection port. be able to.

10 siphon drainage system 18A inlet, 20 storage tank, 22A outlet (connection opening)
26A horizontal pipe, 26B vertical pipe 30 air supply pipe, 32 air supply upstream section 32A opening, 32B intake hole 36A opening, E1 upper end

Claims (4)

a storage tank that stores wastewater flowing in from the inlet;
a horizontal draw pipe connected to the storage tank and discharging the wastewater from the storage tank in a horizontal direction;
a vertical pipe that is disposed downstream of the horizontal pipe and generates a siphon force by causing the waste water from the horizontal pipe to flow down;
An opening on one end side is connected to the horizontal drawing pipe, an opening on the other end side is arranged in the storage tank, an intake hole is formed on the side surface of the pipe vertically lower than the upper end of the inflow port, and the opening on the other end side is arranged in the storage tank. an air supply pipe that allows air in the tank to flow into the horizontal drawing pipe;
Equipped with
The air supply pipe has an air supply upstream portion that extends so that the opening on the other end side is at the bottom in the vertical direction.
Siphon drainage system. The siphon drainage system according to claim 1, wherein the opening at the other end of the air supply pipe is arranged vertically above the reservoir tank than the connection opening of the horizontal draw pipe to the reservoir tank. . The siphon drainage system according to claim 1 or 2, wherein a plurality of the intake holes are formed at the same height in the vertical direction. The siphon drainage system according to any one of claims 1 to 3, wherein the air supply upstream portion extends obliquely in a vertical direction, and the intake hole is formed on the upper side of the side surface of the pipe.