JP2023170455A - Drainage flow passage structure - Google Patents

Abstract

To provide a drainage flow passage structure capable of smoothly discharging drainage water without any hindrance even if the drainage water covers an upper part of an exhaust port of a tank body like a lid.SOLUTION: A drainage flow passage structure of a tank body is composed of a drainage flow passage for discharging drainage water inside the tank body, a water sealing part provided on the drainage flow passage that seals water by filling a part of the drainage flow passage with water, and an exhaust structure that exhausts air in the drainage flow passage upstream of the water sealing part to outside the tank body and to outside of the drainage flow passage. Further, a bottom surface of the tank body is provided with an exhaust port for discharging the drainage water inside the tank body, at least a flow passage from the exhaust port to the water sealing part is configured by a piping member, the piping member configuring from the exhaust port to the water sealing part is provided with a branch part, and the branch part is provided with the exhaust structure.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drainage channel structure for draining water from a drainage device.

BACKGROUND Drainage equipment that generates wastewater when used, such as the washbowl of a washstand or the sink of a sink, is equipped with a tank body that collects wastewater.
The bottoms of these tank bodies are provided with drain ports for discharging waste water inside the tank bodies, and furthermore, in order to discharge the waste water from the drain ports to the sewage side, a drainage channel structure communicating with the drain ports is provided.
Usually, the drainage flow path structure is constituted by a drainage pipe using a pipe body made of resin or the like.
In addition, since the drainage channel structure such as the drainage pipe of the tank body is connected to the channel that communicates with the sewage side, a drainage trap is installed on the channel to prevent odors and pests from the sewage side from entering the indoor side. I'm going to be beaten.

The invention described in Patent Document 1 relates to a drainage pipe that is provided in a washbowl of a washstand and constitutes a drainage channel structure, and includes the washbowl described below, a drain main body, a joint member, and an overflow. Consists of piping members such as piping and trap members.
The washbasin is box-shaped with an open top, and has mounting holes on the bottom and overflow mounting holes on the sides.
The drain port body is a cylindrical member that is attached to the mounting hole, and has a drain port formed inside thereof, and a flange portion that protrudes along the circumference on the outer surface of the upper end, and a flange portion on the side surface below the flange. A drain window is provided for each drain port to allow drain water from the overflow pipe to flow into the drain port body.
The joint member is a cylindrical member to which the drain main body is connected at the upper end and the trap member is connected to the lower end. It is connected and fixed to the washbasin by pinching it with the upper end of the .
The overflow piping consists of an overflow fitting that is attached to the overflow mounting hole and forms an overflow drain, an overflow adapter that is attached to cover the drainage window of the drain outlet body, and a hose pipe that connects the overflow fitting and the overflow adapter. , the drainage from the overflow drain flows into the overflow adapter via the hose pipe, and further flows into the drain main body through the drain window. In addition, the overflow joint and hose pipe, and the hose pipe and overflow adapter shall be glued or connected in advance at a factory, etc., and then brought to the construction site.
The trap member is a piping member in the shape of a substantially S-shaped bent pipe rotated 90 degrees, and when waste water passes through the trap member, a portion of the waste water collects in the bent part of the trap member. A water-filled portion, that is, a water-sealed portion is formed on the flow path within the trap member. Even if odor-containing air or pests try to pass from the downstream side to the upstream side, the odor-containing air or pests cannot pass through this water seal, so the odor-containing air or pests may enter the upstream side. is prevented. The trap function is to prevent air containing odors and pests from flowing back upstream, and the trap function is created by filling the flow path with water that accumulates on the flow path of the wastewater, sealing the flow path with water. Collected water is called water seal.
The trap member made of a tubular body bent into a substantially S-shape described in Patent Document 1 described above is a water-sealing type drainage trap that performs a trap function by sealing water.

The drainage piping for the washbasin with the above configuration is constructed as follows.
First, the drain main body is passed through the mounting hole of the washbasin from above, and the flange portion of the drain main body is engaged with the periphery of the mounting hole.
Next, attach the overflow fitting of the overflow piping to the overflow attachment hole of the washbasin.
Next, the overflow adapter is inserted from below the drain port body and placed on the outer periphery of the drain port body at the position of the drain window.
Next, the joint member is connected to the lower end of the drain port main body, and the flange portion of the drain port main body and the upper end of the joint member are connected and fixed so that the periphery of the attachment hole and the overflow are sandwiched.
Further, the upstream end of the trap member is connected to the lower end of the joint member, and the downstream end is connected to a pipe connected to the sewage side, such as an underfloor pipe, thereby completing the construction of the drainage pipe described in Patent Document 1.

In the wash basin described in Patent Document 1, when waste water occurs in the wash basin, the waste water is treated as follows.
When wastewater occurs in the washbowl, which is a tank body, the wastewater passes through the drain port provided on the bottom of the washbowl, the drain port body, the joint member, and the trap member in this order, and is finally discharged to the sewer side. be done.
In addition, if the drain is blocked with a stopper, etc., and the waste water is collected inside the washbasin, if the waste water accumulates up to the bottom of the overflow drain, the drain will flow from the overflow drain to the overflow joint, hose pipe, and overflow adapter. The water then flows into the drain outlet body through the drain window of the drain outlet body, passes through the drain outlet body, the joint member, and the trap member in this order, and is finally discharged to the sewer side.

In addition, there is a tank body drainage pipe that is similar to the basin drainage pipe described in Patent Document 1, but does not include an overflow drain port and an overflow pipe, such as the washbowl drainage pipe of the invention described in Patent Document 2. . There are various reasons why overflow piping is not adopted, such as cases where overflow piping is unnecessary because wastewater does not accumulate inside the tank body, cases where the overflow drain port is eliminated for the purpose of improving design or cleanability, and cases where the overflow drain port is eliminated for the purpose of improving the design or cleanability. In some cases, an overflow mounting hole cannot be provided during the manufacturing process, and overflow piping cannot be constructed.

JP2013-245488 JP2019-203271

In the above-mentioned drainage channel structure, when the drainage inside the tank is completed, water is collected in the water sealing part of the drainage channel structure, and air is present in other parts of the drainage channel structure.
In this state, drainage occurs inside the tank body, and when the drainage water accumulates inside the tank body, the air inside the drainage channel from the drain port to the sealing water surface on the upstream side of the sealing section (hereinafter referred to as "drainage The air from the drain to the water seal covers the entire drain before passing upward from the drain, forming an interface between the drain and the air at the drain, as shown in Figure 14. In some cases, it becomes like a lid covering the area.
Particularly in recent years, there has been an increase in the number of tank bodies that are roughly mortar-shaped in consideration of design, but such roughly mortar-shaped tanks can easily collect waste water all over the bottom of the tank body, even if only a small amount of water is discharged. Because the water tends to be deep, the drainage from the tank body often becomes like a lid blocking the drain port.
In order to discharge the waste water inside the tank from the drain port in this state, at least a portion of the air from the drain port to the water seal needs to be exhausted to the outside of the drain channel.
When overflow piping is used, such as the drainage piping of the tank body described in Patent Document 1, air can be exhausted from the drain port to the water seal through the overflow piping, and the drainage inside the tank body can be exhausted. can flow into the drain without any hindrance and be discharged from the drainage channel to the sewer side.
However, in a drainage channel that does not employ overflow piping, it is naturally impossible to exhaust air from the drain port to the water seal via the overflow piping. In addition, a water seal is provided in the drainage flow path downstream of the drain, and seal water accumulates inside the water seal to prevent air from passing through. Nor can it be exhausted downstream beyond the water area.
In drainage piping without such overflow piping, the interface between the drainage and air at the drain port is disturbed and destroyed, and some of the air becomes bubbles and is exhausted from the drain port, creating bubbles. The waste water inside the tank body flows into the drain port in such a way that the water is replaced with the drain port, and from then on, the waste water flows into the drain port and the air continues to be discharged from the drain port, thereby draining water from the drain port.
However, once the drainage from the tank becomes like a lid blocking the drain, it often takes a long time until disturbances occur at the interface between the drainage and air at the drain.
If a part of the drainage channel from the drain outlet to the sealed water surface is bent by an L-shaped pipe, etc., and the distance from the drain outlet to the bent part is short, the flow direction of the drainage channel may be , the interface between the drainage and air at the drain is likely to be affected, causing disturbances at the interface. If the structure is such that there is no deviation in the horizontal direction, turbulence is less likely to occur at the interface between the drainage and air at the drainage outlet, and it often takes a long time until drainage starts.

In order to solve the above problem, in the invention described in Patent Document 2, in a drainage pipe that does not have an overflow pipe, a vent pipe is placed inside the drain main body and the other end is arranged inside the drain main body. By placing the drain inside the tank from the inside, the structure allows the air from the drain to the water seal to be exhausted to the outside of the drain, even if the wastewater accumulated inside the tank covers the drain like a lid. .
However, the invention described in Patent Document 2 also has the following problems.
- If the end of the ventilation pipe inside the tank is located low, when wastewater accumulates inside the tank, the end of the ventilation pipe inside the tank will also be covered with wastewater, making ventilation impossible.
- If the overflow piping is omitted for the purpose of improving the design, the design will deteriorate due to the placement of the ventilation pipe, so there is no point in omitting the overflow piping.
- By placing a ventilation pipe at the drain, even if you want to block the drain with a stopper lid, etc., the ventilation pipe will get in the way and you will not be able to block the drain.

The present invention was invented in view of the above circumstances, and even if the drainage channel structure of the tank body covers the upper part of the drain port like a lid, the drainage can be smoothly discharged without any problem. It provides a drainage channel structure.

The first invention includes a drainage channel for discharging wastewater inside the tank body;
a water sealing part provided on the drainage flow path, which seals water by filling a part of the drainage flow path with water;
an exhaust structure that exhausts air in the drainage channel upstream of the water sealing part to outside the tank body and to the outside of the drainage channel;
It is characterized by being composed of.

A second invention is provided with a drain port for discharging waste water inside the tank body on the bottom surface of the tank body, a flow path from at least the drain port to the water sealing part is constituted by a piping member, and The piping member constituting up to the water sealing portion is provided with a branch portion, and the branch portion is provided with the exhaust structure.

A third invention is characterized in that the exhaust structure includes a drainage backflow prevention structure that prevents drainage in the drainage flow path from being discharged to the outside of the tank body and to the outside of the drainage flow path.

A fourth aspect of the present invention is characterized in that the wastewater backflow prevention structure includes a backflow prevention valve that is always open and closed only when the wastewater flows backward.

A fifth invention is characterized in that the drainage backflow prevention structure is constructed from a water-repellent body provided with small holes and subjected to water-repellent treatment.

According to the present invention, the drainage channel structure of the tank body includes an exhaust structure that can exhaust air from the drain port to the water seal to the outside of the tank body and the drainage channel even when overflow piping is not adopted. As a result, even if the drain covers the upper part of the drain like a lid, the air from the drain to the water seal can be exhausted from the drain channel without any problem, and the waste can be smoothly discharged from the drain. can. In this case, since no additional member such as a ventilation pipe is disposed inside the drain, problems such as deterioration in design and inability to close the drain with the lid do not occur. In addition, the exhaust structure is equipped with a backflow prevention structure that allows air to pass through and prevents drainage from passing outside the drainage channel structure, thereby reliably preventing drainage from leaking outside the drainage channel structure. be able to. Specific backflow prevention structures include movable backflow prevention valves that use a valve body such as a float body and close when the valve body moves when wastewater flows backwards, and also There is a backflow prevention structure that includes a water-repellent body with small holes and a water-repellent finish to prevent drainage water from passing through the small holes due to the water repellency of the water-repellent body.
The backflow prevention structure, which uses a water-repellent body and has no moving parts, allows air to pass through the small holes in the water-repellent body, while the backflow of wastewater is prevented by the water-repellent finish applied to the water-repellent body. It has a structure in which it is repelled without passing through the hole, and since there are no moving parts, there is no problem of the backflow prevention structure not functioning due to malfunction of the moving parts.

FIG. 3 is a sectional view showing the washstand of the first embodiment. FIG. 2 is a reference diagram showing the component configuration of a washstand. FIG. 3 is a cross-sectional view showing the structure of a drain port main body, a joint member, and a trap member in the first embodiment. FIG. 2 is a cross-sectional view showing the component configuration of the exhaust device of the first embodiment. FIG. 3 is a sectional view showing the operating state of the washbasin of the first embodiment. FIG. 3 is a sectional view showing the operating state of the washbasin of the first embodiment. FIG. 4 is a reference diagram showing (a) a ventilation state and (b) a backflow prevention state of the exhaust device of the first embodiment. It is a sectional view showing a washstand of a second example. FIG. 3 is a cross-sectional view showing a component configuration of an exhaust device according to a second embodiment. It is a top view of a water-repellent body. It is a sectional view showing an operating state of a washbasin of a second example. It is a sectional view showing an operating state of a washstand of a second example. FIG. 6 is a reference diagram showing (a) a ventilation state and (b) a backflow prevention state of the exhaust device of the second embodiment. FIG. 2 is a cross-sectional view of a conventional wash basin showing its operating state.

A first embodiment of the present invention will be described below with reference to the drawings.
The drainage channel structure of the first embodiment of the present invention shown in FIGS. 1 to 7 is a drainage channel structure used in the washbowl B of the washstand S as a tank body, and is assembled by piping members. Consists of drainage piping. The piping members constituting the washbasin S and the drain piping include members such as a drain main body 1, a joint member 2, a trap member 3, and an exhaust device 4, which will be described below.
The washstand S is composed of a washbowl B and a cabinet C, which will be described below.
The washbowl B is composed of a bowl portion B1 that is approximately mortar-shaped with an open top, and a bowl side wall portion B2 that hangs downward from the upper end of the bowl portion B1. It is equipped with a mounting hole H.
The cabinet C is a box body in which the washbasin B is placed, and is provided with a door that can be opened and closed on the front side and an opening at the center of the top side.
The cabinet C having the above configuration has the lower end of the bowl side wall portion B2 placed on the upper surface thereof, and the lower end of the bowl portion B1 is inserted into the cabinet C through the opening at the center of the upper surface to drain water inside the cabinet C. Drainage piping that makes up the channel structure will be constructed. In the following embodiments, it is assumed that the washbowl B is placed and fixed on the upper surface of the cabinet C and is transported to the construction site, and is placed and fixed at an appropriate position on the construction site.
The drain port main body 1 is a member having a substantially cylindrical shape, and has a drain port 1a formed at an opening at the upper end, and a drain channel formed inside the cylinder continuous from the drain port 1a. Further, a flange portion 1b protruding in the side surface direction is provided on the outer peripheral side of the upper end portion, and a male thread is formed on the side surface portion below the flange portion 1b.
It also includes a plate nut member 1c provided with a female thread that is screwed into the male thread of the drain port body 1.
The joint member 2 is a piping member that includes a straight pipe portion 2a having a straight pipe shape and a branch pipe portion 2b as a branch portion on the side surface of the straight pipe portion 2a. The lower ends of the straight pipe portions 2a are respectively connected to the trap members 3 in a watertight manner. Further, the end of the branch pipe portion 2b is connected to the exhaust device 4.
The trap member 3 is a piping member in the shape of a substantially S-shaped bent pipe rotated 90 degrees, and when waste water passes through the trap member 3, a portion of the waste water flows into the bent portion of the trap member 3. The water accumulates in the trap member 3, forming a water-filled portion, that is, a water-sealed portion on the flow path within the trap member 3. Even if odor-containing air or pests try to pass from the downstream side to the upstream side, the odor-containing air or pests cannot pass through this water-sealed area. Intrusion is prevented. The trap function is to prevent air containing odors and pests from flowing back upstream, and the trap function is created by filling the flow path with water that accumulates on the flow path of the wastewater, sealing the flow path with water. The accumulated water is called a water seal, and the part of the trap member 3 that forms the water seal is called a water seal part 3a.
The trap member 3 made of a pipe body bent into a substantially S-shape according to this embodiment is a water-sealing drainage trap that performs a trap function by sealing water.

The exhaust device 4 includes an exhaust device main body 5, an L-shaped pipe 6, a float body 7, and a cover body 8, which will be described below.
As shown in FIG. 4, the exhaust device main body 5 is a member shaped like an upside-down bowl, and has a plurality of ventilation holes 5a on the upper wall surface, and has a float body 7 in contact with the lower surface to provide ventilation. It includes a valve seat portion 5b that closes the air hole 5a, and a guide shaft 5c that is a shaft portion extending downward from the center of the valve seat portion 5b. Further, the lower end of the guide shaft 5c is provided with a stopper 5d for preventing the float body 7 from falling off.
The float body 7 is a flat disk having a guide hole 7a in the center through which the guide shaft 5c is inserted, and is made of an elastic material with a specific gravity smaller than 1.
The L-shaped pipe 6 is a pipe body bent into a substantially L-shape, and is constructed so that one end thereof faces substantially horizontally and the other end faces vertically upward. Among the ends of the L-shaped pipe 6, the end facing in the substantially horizontal direction is connected to the branch pipe part 2b of the joint member 2, and the end facing vertically upward is attached to the exhaust device main body 5.
The cover body 8 is a member in the shape of an upside-down bowl, and has a rib body 8a inside thereof, and is attached so as to cover the exhaust device body 5 with a gap provided by the rib body 8a. By attaching the cover body 8, air from the ventilation hole 5a can be exhausted from the gap between the exhaust device main body 5 and the cover body 8, and dust etc. accumulate in the ventilation hole 5a and block the ventilation hole 5a. It is possible to prevent the problem of the floating body 7 from adhering to the periphery of the valve seat portion 5b, which prevents the float body 7 from properly abutting against the valve seat portion 5b, and causing water leakage during backflow.
The above-mentioned exhaust system 4 is assembled into the state shown in FIGS. 5 to 7 by the following procedure.
First, the guide shaft 5c of the exhaust device main body 5 is inserted into the guide hole 7a of the float body 7. A stopper 5d having a larger diameter than the guide hole 7a is provided at the lower end of the guide shaft 5c, but since the float body 7 is elastic, the stopper 5d can be moved by elastically deforming the guide hole 7a and expanding its diameter. The guide shaft 5c can be inserted beyond this point.
Next, the vertically upward end of the L-shaped tube 6 is connected to the lower opening of the exhaust device main body 5 in a watertight manner, so that the L-shaped tube 6 and the inside of the exhaust device main body 5 are in communication with each other.
Furthermore, the cover body 8 is attached to the exhaust device main body 5, and the assembly of the exhaust device 4 is completed.
The exhaust system 4 is delivered to the construction site of the wash basin S in an assembled state.

Each member configured as described above is installed on the washbowl B of the washstand S in the following manner.
Incidentally, at the connection points of each member, watertight connections are made by packing, adhesion, or other methods as appropriate, even if not specified.
First, the drain main body 1 is inserted into the mounting hole H of the washbasin B, and the peripheral edge of the mounting hole H is brought into contact with the lower surface of the flange portion 1b.
Next, screw the plate nut member 1c onto the male thread of the drain body 1, and attach the drain body 1 to the sink by sandwiching the periphery of the mounting hole H between the lower surface of the flange portion 1b and the upper surface of the plate nut member 1c. Connect and fix to bowl B.
Next, the upper end of the straight pipe part 2a of the joint member 2 is connected to the lower end of the drain main body 1, and the trap member 3 is connected to the lower end of the straight pipe part 2a of the joint member 2. Further, the lower end of the trap member 3 is connected to underfloor piping.
Furthermore, the exhaust device 4 is connected to the branch pipe portion 2b of the joint body 2, and the construction of the drainage pipe forming the drainage channel structure of this embodiment is completed.
In the state where the construction is completed, as is clear from FIG. 1, the exhaust device 4 is located at a position lower than the mounting surface of the washbowl B, specifically, within the cabinet C, and further lower than the drain port 1a. It is located in its entirety. Since the exhaust device 4 is disposed within the wide cabinet C rather than between the narrow bowl portion B1 and the bowl side wall portion B2, the degree of freedom in the arrangement layout of the exhaust device 4 is high, and construction work can be easily performed.
In addition, since the exhaust device 4 is equipped with a backflow prevention valve using a float body 7 as a backflow prevention structure as described later, even if it is placed at a position lower than the drain port 1a, there is no water inside the drainage flow path outside the drainage flow path. There is no risk of drainage leaking.

The operation of the drain pipe of the washstand S in the first embodiment will be explained below. In the explanation of how to use this embodiment, it is assumed that the wash basin S is used in advance and a water seal is formed in the water seal part 3a as shown in FIG. Further, as is clear from FIGS. 1, 5, etc., the drainage pipe is vertically arranged in a straight line from the drain port 1a to the water surface W on the upstream side of the sealed water.

In the washbasin S of the first embodiment, when wastewater is generated in the washbowl B due to the use of the washstand S, the wastewater is treated as follows.
When drainage occurs in the washbowl B, which is a tank body, the wastewater passes through the drain port 1a provided on the bottom of the washbowl B in the order of the drain port body 1, the joint member 2, the trap member 3, and finally is discharged into the sewer.
Although the exhaust system 4 of this embodiment is configured and constructed for the purpose of exhausting air, the valve is always open except when drainage is flowing backward, so it is closed when drainage is flowing smoothly. It is also possible to vent air from outside the drainage channel into the drainage channel without using a valve. Therefore, when the drainage flow is fast and the inside of the drainage flow path becomes negative pressure, the negative pressure can be eliminated by sucking air from the exhaust device 4, and breakage of the seal can be prevented.

In addition, when using the washbasin S and draining water into the washbowl B, which is a tank body, the water is drained above the drain port 1a before the air from the drain port 1a to the water seal escapes from the drain port 1a. As shown in FIG. 5, the water may accumulate and become like a lid blocking the drain port 1a. In particular, the washbowl B of this embodiment has a substantially mortar shape, and even a small amount of wastewater easily accumulates on the entire bottom surface of the washbowl B, and the water depth tends to become deep. In many cases, the drainage becomes like a lid blocking the drain port 1a.
Furthermore, in this embodiment, since the drain pipe is vertically arranged in a straight line from the drain port 1a to the water surface W on the upstream side of the sealed water, the waste water generated in the washbasin B blocks the drain port 1a. When it is in a lid-like state, the interface between the waste water and air at the drain port 1a is hardly disturbed, and the structure is such that air bubbles are hardly generated.
Even if the drainage in the washbowl B is like a lid that blocks the drain 1a, the air from the drain 1a to the water seal will flow through the joint as shown by the arrow in Fig. 7(a). From the branch pipe portion 2b of the member 2, it passes through the L-shaped pipe 6 of the exhaust device 4, and from the vent hole 5a of the exhaust device main body 5 to the outside of the drainage pipe, that is, the outside of the drainage flow path and the washbowl B, which is the tank body. It is exhausted without any problem.
As a part of the air from the drain port 1a to the water seal has been exhausted, as shown in FIG. It passes through the drain port main body 1, the joint member 2, and the trap member 3 in this order, and is finally discharged to the sewer side.
Furthermore, when the waste water flows out to the exhaust device 4 through the branch pipe portion 2b of the joint member 2, the float body 7 made of a material with a specific gravity smaller than 1 floats on the waste water and moves along the guide shaft 5c. As shown in FIG. 7(b), the valve seat 5a comes into contact with the valve seat 5b and closes the ventilation hole 5a, so that the drainage water does not leak out of the drainage channel from the ventilation hole 5a.
When the drainage is completed, the drainage inside the exhaust device 4 is also discharged to the straight pipe section 2a of the joint member 2 through the branch pipe section 2b and is lost, and the float body 7 descends to the stopper 5d position due to its own weight, so that the flow is stopped. The pores 5a open and the air can be exhausted from the drain port 1a to the water seal again.
That is, the exhaust device 4 of this embodiment exhausts the air in the drainage channel between the drain port 1a and the upstream water surface W of the sealed water to the outside of the washbowl B, which is the tank body, and to the outside of the drainage channel. It has an exhaust structure, and furthermore, the float body 7 is used as a valve, which is always open to allow air to ventilate, and is closed only when wastewater flows backward to prevent wastewater from being discharged outside the tank body and drain flow path. A backflow prevention valve is configured as a backflow prevention structure for wastewater.

Next, a second embodiment of the present invention will be described with reference to the drawings.
It should be noted that the drainage channel structure of the second embodiment of the present invention shown in FIGS. Descriptions of members other than 4 will be omitted, and only the configuration of the exhaust device 4 will be described below.

The exhaust device 4 of the second embodiment is composed of an L-shaped pipe 6, a water repellent body 9, and a cap body 10, which will be described below.
The L-shaped pipe 6 is a pipe body bent into a substantially L-shape, and is constructed so that one end thereof faces substantially horizontally and the other end faces vertically upward. Among the ends of the L-shaped pipe 6, the end facing in the substantially horizontal direction is connected to the branch pipe part 2b of the joint member 2, and the water repellent body 9 is arranged at the end facing vertically upward.
As shown in FIGS. 9 and 10, the water repellent body 9 is a circular plate-shaped metal plate having a plurality of regularly provided small holes 9a. It has been treated to be water repellent.
The cap body 10 is a member that has a substantially cylindrical shape and has an inward flange 10a at one end of the cylindrical shape, and is attached to the end of the L-shaped tube 6 in which the water repellent body 9 is disposed. By fixing the water repellent body 9 to the end of the L-shaped tube 6 by the portion 10a, ventilation can be performed from the small hole 9a of the water repellent body 9, and the water repellent body can be removed from the end of the L-shaped tube 6. 9 from falling off, etc.
The above-mentioned exhaust device 4 has a water repellent body 9 arranged at the end of the L-shaped tube 6 facing vertically upward, and a cap body 10 arranged at the end of the L-shaped tube 6 facing vertically upward. The assembly is completed in the state shown in FIGS. 11 to 13 by attaching it so that it can be ventilated through the small hole 9a and not fall off from the L-shaped tube 6.
The exhaust system 4 is delivered to the construction site of the wash basin S in an assembled state.

The procedure for installing the drainage pipe in the second embodiment of the present invention to the washbowl B of the washstand S is the same as the procedure for installing the drain pipe to the washbowl B of the washstand S in the first embodiment described in paragraph 0020. Therefore, it is omitted.
It should be noted that, as is clear from FIG. 8, in the completed construction state, the exhaust system 4 is entirely disposed within the cabinet C at a position lower than the drain port 1a, which is the same as in the first embodiment. It is similar to

Below, the operation of the drain pipe of the washbasin S of the second embodiment will be explained. In the explanation of how to use this embodiment, it is assumed that the wash basin S is used and a water seal is formed in the water seal part 3a in advance. Further, as is clear from FIGS. 8, 11, etc., the drainage pipe is vertically arranged in a straight line from the drain port 1a to the upstream water surface W of the sealed water.

In the washbasin S of the second embodiment, when wastewater is generated in the washbowl B due to the use of the washstand S, the wastewater is treated as follows.
When drainage occurs in the washbowl B, which is a tank body, the wastewater passes through the drain port 1a provided on the bottom of the washbowl B in the order of the drain port body 1, the joint member 2, the trap member 3, and finally is discharged into the sewer.
Although the exhaust device 4 of the present invention is configured and constructed for the purpose of exhausting air, it is not particularly equipped with a mechanism for closing the small hole 9a of the water repellent body 9, and when drainage is being carried out smoothly. It is also possible to vent air from outside the drainage channel into the drainage channel. Therefore, when the drainage flow is fast and the inside of the drainage flow path becomes negative pressure, the negative pressure can be eliminated by sucking air from the exhaust device 4, and breakage of the seal can be prevented.

In addition, when using the washstand S and draining water into the washbowl B, which is a tank body, the water is drained above the drain port 1a before the air from the drain port 1a to the water seal escapes from the drain port 1a. As shown in FIG. 11, the water may accumulate and become like a lid blocking the drain port 1a. In particular, the washbowl B of this embodiment has a substantially mortar shape, and even a small amount of wastewater easily accumulates on the entire bottom surface of the washbowl B, and the water depth tends to become deep. In many cases, the drainage becomes like a lid blocking the drain port 1a.
Furthermore, in this embodiment, since the drain pipe is vertically arranged in a straight line from the drain port 1a to the water surface W on the upstream side of the sealed water, the waste water generated in the washbasin B blocks the drain port 1a. When it is in a lid-like state, the interface between the waste water and air at the drain port 1a is hardly disturbed, and the structure is such that air bubbles are hardly generated.
Even if the drainage inside the washbowl B is like a lid blocking the drain port 1a, the air from the drain port 1a to the water seal will flow through the joint as shown by the arrow in Fig. 13(a). From the branch pipe portion 2b of the member 2, it passes through the L-shaped pipe 6 of the exhaust device 4, and from the small hole 9a of the water repellent body 9 to the outside of the drainage pipe, that is, the outside of the drainage flow path and the washbowl B, which is the tank body, without any hindrance. Exhausted.
As a part of the air from the drain port 1a to the water seal is exhausted, as shown in FIG. 12, the waste water in the washbasin B flows from the drain port 1a into the drain main body 1 without any hindrance. It passes through the drain port main body 1, the joint member 2, and the trap member 3 in this order, and is finally discharged to the sewer side.
In addition, when wastewater flows out in the direction of the exhaust device 4 through the branch pipe portion 2b of the joint member 2, the water-repellent surface of the water-repellent body 9 and the small hole 9a is treated with a water-repellent finish. ), waste water cannot pass through the water repellent body 9. In order for the waste water to pass through the water repellent body 9, it is necessary for the waste water to flow from the surface of the water repellent body 9 toward the small holes 9a, or for the waste water to pass through the small holes 9a in the form of water droplets smaller than the small holes 9a. Since the surface of the water-repellent body 9 is treated with water-repellent treatment, the waste water cannot flow from the surface of the water-repellent body 9 toward the small hole 9a, and since the amount of water is sufficient, the water does not pass through the small hole 9a. The water droplets cannot become as small as possible, and are all repelled by the water-repellent treatment of the water-repellent body 9, resulting in a state in which the water cannot pass through the water-repellent body 9.
When the drainage is completed, the drainage in the exhaust device 4 is also discharged to the straight pipe section 2a of the joint member 2 through the branch pipe section 2b and is lost, making it possible to exhaust the air between the drain port 1a and the water seal. Become.
That is, the exhaust device 4 of this embodiment exhausts the air in the drainage channel between the drain port 1a and the upstream water surface W of the sealed water to the outside of the washbowl B, which is the tank body, and to the outside of the drainage channel. A backflow prevention structure for wastewater which is an exhaust structure and prevents wastewater from being discharged outside the tank body and out of the drainage flow path using a water repellent body 9 which is a circular plate-shaped body provided with small holes 9a and subjected to a water repellent treatment. Be prepared.

Although the embodiments of the present invention have been described above, various design changes may be made to the piping structure of the present invention without departing from the gist of the invention.
For example, in each of the above embodiments, the tank body is the washbowl B of the washstand S, but the present invention is not limited to the above embodiments, and the tank body may be the sink of a sink or the bathtub of a bathroom.
Further, in the second embodiment, the cover body 8 is not adopted because it does not include a movable part, but a cover body 8 similar to the cover body 8 of the first embodiment is attached to cover the water repellent body 9. It is also possible to adopt a structure in which dust and the like do not block the small hole 9a.

Furthermore, in the second embodiment, the water repellent body 9 is made of a circular plate-like body, but the present invention is not limited to the above-mentioned embodiment. The water-repellent body 9 may be formed by applying a water-repellent finish to the provided mesh body, sponge-like body, or the like. Even with the water repellent body 9 having these configurations, it is possible to exhaust air from the small holes 9a to the outside of the drainage flow path, while preventing backflow of wastewater from occurring outside the drainage flow path due to the water repellent action of the water repellent body 9. .

1 Drain port main body 1a Drain port 1b Flange portion 1c Plate nut member 2 Joint member 2a Straight pipe portion 2b Branch pipe portion 3 Trap member 3a Water sealing portion 4 Exhaust device 5 Exhaust device main body 5a Vent hole 5b Valve seat portion 5c Guide shaft 5d Stopper 6 L-shaped tube 7 Float body 7a Guide hole 8 Cover body 8a Rib body 9 Water repellent body 9a Small hole 10 Cap body 10a Flange B Washbowl B1 Bowl portion B2 Bowl side wall portion C Cabinet H Mounting hole S Washstand W Water seal upstream water surface of

Claims (5)

a drainage channel for discharging wastewater inside the tank;
a water sealing part provided on the drainage flow path, which seals water by filling a part of the drainage flow path with water;
an exhaust structure that exhausts air in the drainage channel upstream of the water sealing part to outside the tank body and to the outside of the drainage channel;
A drainage channel structure characterized by comprising: A drain port is provided on the bottom surface of the tank body for discharging wastewater inside the tank body, and at least a flow path from the drain port to the water sealing portion is configured by a piping member, and a flow path from the drain port to the water sealing portion is formed by a piping member. The drainage channel structure according to claim 1, wherein the constituting piping member is provided with a branch portion, and the branch portion is provided with the exhaust structure. 3. The exhaust structure includes a drainage backflow prevention structure that prevents drainage in the drainage channel from being discharged outside the tank body and out of the drainage channel. drainage channel structure. The drainage backflow prevention structure is
4. The drainage channel structure according to claim 3, comprising a check valve that is always open and closed only when drainage water flows backward. The drainage backflow prevention structure is
4. The drainage channel structure according to claim 3, characterized in that it is constructed of a water-repellent body provided with small holes and subjected to water-repellent treatment.

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