JPH11158957A - Vertical drain pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent drain mixed with detergents from lathering and prevent also a choked condition with bubbles from occurring and further, prevent a trap sealing from breaking, and improve the discharge capacity of the drain mixed with detergents by constituting a projection spirally formed on the inside face of a pipe so that the whirlpool force of the drain becomes continuously or intermittently weak toward the downstream side. SOLUTION: A spiral projection 4 with a triangular section is formed in the whole pipe length at the inside face 3 of a vertical drain pipe 1 made of a synthetic resin or the like and the spiral pitches P1, P2,...Pn of the projection 4 are made larger intermittently from the upstream side to the downstream side and the upper flow water-collecting pipe 2 and the lower floor water- collecting pipe 2 are connected to each other through the vertical drain pipe 1. These spiral pitches P1, P2,...Pn are intermittently changed while the spiral angle θ of the projection 4 in one pitch is kept constant or continuously changed while the spiral angle θ is made smaller in sequence. Accordingly, the whirlpool force of the drain spirally flowing down along the projection 4 in the vertical drain pipe of respective floors becomes gradually small and flows nearly straight in the water-collecting pipe of the lower floor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainpipe which constitutes a part of a household drainage facility for buildings such as middle and high rise houses.

[0002]

2. Description of the Related Art Generally, in a middle-rise or high-rise apartment house, a one-pipe type drain pipe for flowing sewage and gray water into the same drain pipe is used. As illustrated in FIG. 4, this piping includes a horizontal branch pipe 13 connected to a drainage device 12 such as a toilet bowl of each level, a collecting pipe 14 connected to each horizontal branch pipe 13, and a pipe of each level. Drainage riser 15 that connects collecting pipe 14 to make it straight
And a drain horizontal main pipe 17 connected to the lower end of the lowermost collecting pipe 14 through a bent leg pipe 16 and the like, and is formed into a single pipe type.

[0003] In this one-pipe type drain pipe, when drainage flows down the drainpipe 15, the air pressure in the pipe fluctuates greatly as it descends from the upper floor to the lower floor, and drainage noise is generated. Spiral blades are formed on the inner peripheral surface of the tubular collecting pipe 14 so as to protrude, apply a swirling force to the drainage to flow along the inner wall of the pipe, and generate an air core at the center of the drainage standing pipe 15. This suppresses pressure fluctuations in the pipe.

Conventionally, in order to further positively generate a swirling flow of the drainage in the drainage vertical pipe 15, there is a type in which a spiral projection is provided on the inner peripheral surface of the vertical pipe over the entire length thereof. The projections have the same sectional shape, the same screw pitch, and the same number of threads. Therefore, the drainage to which the turning force is given in the collecting pipe 14 is further given the turning force in the drainage riser 15, and is further kept in the lower hierarchy collecting pipe 14 and the drainage riser 15 with the same turning force (speed). Swivel force is increased and horizontal drain pipe 1
Flow down to 7.

As described above, by increasing the turning force,
It is possible to enhance the drainage capacity of the wastewater in which the detergent is not mixed.

[0006]

In the prior art described above, if detergent is mixed in the drainage, the greater the swirling force of the drainage, the more detergent bubbles will be generated, and the lateral water connected to the drainage stand 15 will be generated. In the main pipe 17, a so-called bubble plug phenomenon occurs in which bubbles due to a detergent or the like close the inside of the pipe. After that, the air that flows along with the drainage in the drainage stack stays at the foam plug portion,
Abnormal pressure rise in the upstream pipe.

[0007] When an abnormal pressure rise occurs due to the occurrence of the foam plug phenomenon as described above, the pressure in the horizontal branch pipe 13 is increased not only through the drainage pipe 15 but also through the collecting pipe 14, and the drainage equipment 1 connected to the horizontal branch pipe 13.
In the trap section of 2, etc., squirting of water due to trap opening,
There is a risk of generating offensive odor. SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and has as its object to prevent the occurrence of a foam plug phenomenon due to wastewater mixed with a detergent and to prevent the trap from being opened, thereby improving the drainage capacity of the detergent wastewater. It is to provide a standing pipe which can be achieved.

[0008]

According to the present invention, the following technical measures have been taken in order to achieve the above object. That is, the present invention relates to a standing pipe in which a spiral projection is provided on the inner surface of the pipe so as to generate a swirling force in drainage or the like, wherein the projection has a continuous or intermittent draining swirl force toward the downstream side. It is configured to be smaller. Therefore, the drainage flowing while turning along the protrusion in the standing pipe flows down almost straight along the pipe inner surface as the turning force decreases,
Even in the wastewater mixed with the detergent, the generation of bubbles is reduced, the occurrence of the foam plug phenomenon can be prevented, the drainage discharge ability can be improved, and the trap can be prevented from being opened.

In the present invention, specifically, the helical pitch of the projection is increased from the upstream side to the downstream side.
According to this configuration, the turning force of the drainage is large at the upper part of the drainage riser, but the pitch of the projections increases as the water flows down, and the turning force gradually decreases, thereby suppressing the generation of bubbles in the detergent drainage. Therefore, the bubble plug phenomenon can be prevented. Also,
In the present invention, the height of the protrusion from the inner surface of the tube may be reduced from the upstream side to the downstream side. In this case, as the protrusion height of the protrusion decreases, the amount of drainage that overflows without following the protrusion gradually increases,
The swirling force of the drainage gradually decreases, and flows down almost straight along the inner wall of the pipe at the lower part of the standing pipe.

By sequentially increasing the helical pitch of the projections and decreasing the projection height of the projections, the turning force of the drainage can be effectively reduced sequentially. Further, the present invention can be configured by connecting the standing pipe divided into a plurality of pieces in the pipe axis direction. In this case, a plurality of divided standing pipes having different pitches and / or projecting heights of the projections are manufactured, and the drainage main pipes can be configured by appropriately connecting the divided standing pipes.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a first embodiment of the present invention. The drainage riser 1 is made of synthetic resin or metal, and is connected between the upper floor collecting pipe 2 and the lower floor collecting pipe 2. Then, the inner surface 3 of the standing pipe 1, the helical projections 4 of the triangular cross section is provided across the tubes overall length, yet, downstream helical pitch P ₁ of the protrusion 4, P ₂ ...... P _n from upstream Being intermittently larger towards.

The spiral pitches P ₁ , P ₂ ... P _n
Is a so-called intermittent change in which the helix angle θ (helix angle) of the protrusion 4 during one pitch is constant (in the case of FIG. 1).
And a continuous change in which the helical angle θ of the projection 4 between one pitch is gradually reduced. According to the first embodiment, as illustrated in FIG. 2, the swirling force of the drainage flowing down while turning inside the drainage stack 1 of each level along the protrusion 4 (the size of the arrow in FIG. 2). Indicates the magnitude of the swirling force of the drainage.) Gradually decreases from the upstream side to the downstream side. That is, the drainage water is weakened so that the swirling flow gradually becomes substantially parallel to the pipe axis, flows into the lower-layer collecting pipe 2 almost straight along the pipe wall, and in the inter-collection 2 While the swirling force is applied to the drainage, the swirling force is gradually reduced while swirling in the drainage riser 1 and flows into the lower-layer collecting pipe 2.

Therefore, even if the detergent is mixed in the waste water, the foaming is reduced and the foam is not filled in the horizontal main pipe 5 and the foam plug phenomenon does not occur.
Abnormal pressure rise in the inside can be prevented. FIG. 3 shows a second embodiment of the present invention. The drainage riser 11 in this embodiment is provided with a spiral projection 4 having a triangular cross section on the inner surface 3 over the entire length of the pipe, as in the first embodiment, but the spiral pitch P of the projection 4 is constant. The projection heights h ₁ , h _2, ..., H _n of the projections 4 from the tube inner surface 3 are continuously reduced. The height h of the projection 4 is reduced intermittently. For example, it can be changed for each pitch P of the spiral of the projection 4.

According to the second embodiment, the drainage flowing down while rotating inside the drainage vertical pipe 11 along the projection 4 does not follow the projection 4 as the projection height of the projection 4 gradually decreases from the upstream side. After that, the amount of water flowing down gradually increases and the turning force decreases (see FIG. 2), and becomes substantially straight at the lower part of the drainage riser 11, and flows into the lower-layer collecting pipe 2. Therefore, even in the case of wastewater mixed with a detergent, foaming is small, and a foam plug phenomenon in the horizontal main pipe 5 does not occur.

In the first and second embodiments, the drainage risers 1 and 11 can be manufactured by dividing into a plurality of pipes in the pipe axis direction, and these divided risers can be connected and completed. Further, the number of protrusions 4 can be plural. Furthermore, the projection height of the projection 4 in the first embodiment can be continuously reduced toward the downstream.

[0016]

As described above, according to the present invention, the spirally provided projections on the inner surface of the pipe are configured such that the swirling force of the drainage decreases continuously or intermittently toward the downstream side. Further, it is possible to reduce foaming of the wastewater mixed with the detergent, to prevent the occurrence of the foam plug phenomenon and to prevent the trap from being opened, and to improve the drainage capacity of the detergent wastewater.

[Brief description of the drawings]

FIG. 1 is a central longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of the present invention.

FIG. 3 is a central longitudinal sectional view showing a second embodiment of the present invention.

FIG. 4 is an overall front view showing an example of a one-pipe drainage pipe in an apartment house.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drainage riser 3 Pipe inner surface 4 Projection 11 Drainage riser P Spiral pitch of projection h Projection height of projection from tube inner surface

Claims (4)

[Claims] 1. A standing pipe in which a spiral projection is provided on an inner surface of a pipe so as to generate a swirling force in drainage or the like, wherein the projection continuously or intermittently causes a drainage swirling force toward a downstream side. A drainage stack that is configured to be small. 2. The drainpipe according to claim 1, wherein a spiral pitch of the projection is increased from an upstream side to a downstream side. 3. The drainage vertical pipe according to claim 1, wherein a height of the projection from the inner surface of the pipe decreases from an upstream side to a downstream side. 4. The standing pipe is constructed by connecting a plurality of pipes divided in a pipe axis direction.
Or the drainage stack according to 3.