JP7660477B2 - Drainage System - Google Patents

Description

The present invention relates to a drainage system equipped with a siphon drain pipe.

Conventionally, a drainage system has been proposed in which a pipe condition detection device is provided in the horizontal pipe of a siphon drain pipe to detect the condition inside the pipe, and the condition of dirt adhering to the inside of the horizontal pipe is detected (see, for example, Patent Document 1).

International Publication No. 2020/100891

Conventionally, it was thought that dirt was likely to adhere to the horizontal pipe, which is the upstream part of the siphon drain pipe.
However, it was found that when a siphon drain pipe is used over a long period of time, dirt tends to accumulate in the vertical pipe rather than in the horizontal pipe.

The present invention takes the above into consideration and aims to provide a drainage system that allows the user to easily know the condition of the vertical pipe of the siphon drainage pipe.

The drainage system described in claim 1 has a siphon drainage pipe including a horizontal pipe that extends horizontally and drains drainage from a plumbing fixture, a vertical pipe that is provided downstream of the horizontal pipe and extends vertically, and a drop-in section that is located between the horizontal pipe and the vertical pipe, an in-pipe condition detection device that detects the internal condition of the vertical pipe and outputs condition detection data, and a notification means that notifies the internal condition of the vertical pipe based on the condition detection data.

In the drainage system according to the first aspect of the present invention, the pipe internal condition detection device detects the internal condition of the vertical pipe of the siphon drain pipe, and outputs condition detection data corresponding to the internal condition of the pipe.
The notification means notifies the state inside the vertical pipe of the siphon drain pipe based on the state detection data.
This makes it possible to know the condition inside the vertical pipe of the siphon drain pipe without removing the piping.

The invention described in claim 2 is the drainage system described in claim 1, in which the vertical pipe is provided with a light-transmitting portion through which light passes, and the pipe internal condition detection device optically detects the internal condition of the vertical pipe via the light-transmitting portion.

In the drainage system described in claim 2, the pipe condition detection device optically detects the internal condition of the vertical pipe through the light transmitting portion and outputs the condition detection data. Note that the vertical pipe only needs to have a light transmitting portion in at least a portion thereof, and may be entirely made of a material that transmits light.

The invention described in claim 3 is the drainage system described in claim 2, in which the pipe condition detection device includes a transmission type optical sensor having a light source that irradiates light toward the light transmitting portion and a light receiving element that receives light that has passed through the light transmitting portion.

In the drainage system described in claim 3, the condition inside the vertical pipe can be detected by irradiating light from a light source toward the light-transmitting portion, transmitting the light through the light-transmitting portion, and receiving the transmitted light with a light-receiving element.

The invention described in claim 4 is the drainage system described in claim 2, in which the pipe condition detection device includes a reflective optical sensor that irradiates light from the light transmitting section toward the inside of the vertical pipe and receives the light reflected by the inner surface of the vertical pipe.

In the drainage system described in claim 4, the reflective optical sensor can detect the state of the upright pipe by irradiating light from the light transmitting portion toward the inside of the upright pipe and receiving the light reflected by the inner surface of the upright pipe.

The invention described in claim 5 is the drainage system described in claim 2, in which the pipe condition detection device includes a camera that captures images of the inside of the vertical pipe through the light transmitting portion.

In the drainage system described in claim 5, the condition inside the vertical pipe can be detected by photographing the inside of the vertical pipe with a camera through the light-transmitting part.

As described above, the drainage system of the present invention has the excellent effect of making it easy to know the condition of the vertical pipe of the siphon drainage pipe.

FIG. 1 is a side view showing the overall configuration of a siphon drainage system according to a first embodiment. FIG. FIG. 4 is a perspective view, partially in section, showing a recessed portion. FIG. 4 is an enlarged cross-sectional view of a first vertical pipe member showing the periphery of a transmission-type optical sensor. FIG. 4 is a cross-sectional view showing a horizontal pulling tube member to which an electrode is attached. 4 is a cross-sectional view showing a horizontal pipe member to which a liquid level sensor is attached. FIG. A cross-sectional view showing a first vertical pipe member of a siphon drainage system according to a second embodiment. A cross-sectional view showing a first vertical pipe member of a siphon drainage system according to a third embodiment.

First Embodiment
A siphon drainage system 10 according to a first embodiment of the present invention will be described with reference to Figures 1 to 5. Figure 1 shows a schematic diagram of the overall configuration of the siphon drainage system 10. The siphon drainage system 10 according to this embodiment is a drainage system that efficiently discharges wastewater from a plumbing fixture by utilizing siphon force.

(Outline of the siphon drainage system)
The siphon drainage system 10 of this embodiment is used in a multi-story apartment building, and is equipped with a drainage standpipe 12 that drains wastewater downward, as shown in Fig. 1. This drainage standpipe 12 extends in the up-down direction (vertical direction) of the apartment building, and penetrates the floor slab 14 of each floor of the apartment building. The drainage standpipe 12 is disposed on the outside of an exterior wall 16 that separates the inside and outside of a dwelling unit, for example, in a meter box 18. The siphon drainage system of this embodiment is suitable for use in apartment buildings, but can also be used in detached houses, factories, and other buildings other than apartment buildings.

Each unit on each floor of the apartment building is provided with a plumbing fixture 20. One example of this plumbing fixture 20 is a kitchen sink, with a garbage disposer 22 and a drain trap 24 connected to it downstream in the drainage direction. A first L-shaped piping member 26 bent into an L shape is disposed downstream in the drainage direction of the drain trap 24. The first L-shaped piping member 26 is configured to include a vertical section 26A that is connected to the drain trap 24 and extends vertically, a horizontal section 26B that is disposed horizontally on the floor slab 14 and extends horizontally, and a curved section 26C that connects the vertical section 26A and the horizontal section 26B.

Downstream in the drainage direction of the first L-shaped piping member 26 is a horizontal pipe member 28 that is disposed on the floor slab 14 and extends horizontally, in other words, perpendicular to the vertical direction. The first L-shaped piping member 26 and the horizontal pipe member 28 are connected via a joint 30.

The first connection part 60 of the L-shaped drop part 50 described later is connected to the downstream side of the horizontal pull pipe member 28 in the drainage direction via a joint 32. The first vertical pipe member 36A, joint 37, and second vertical pipe member 36B, which extend in the up-down direction (vertical direction), are arranged on the downstream side of the drop part 50 in the drainage direction. The second connection part 62 of the drop part 50 is connected to the upstream end of the first vertical pipe member 36A. The lower end of the drop part 50 is inserted into the through hole 14A formed in the floor slab 14, and the drop part 50 and the first vertical pipe member 36A are arranged to pass through the through hole 14A.

The first vertical pipe member 36A is made of a synthetic resin having optical transparency. Note that the optical transparency of "light" is not limited to visible light, but also includes light other than visible light, such as infrared light. The first vertical pipe member 36A of the present embodiment is made of a transparent PVC pipe, for example.
On the other hand, the second upright pipe member 36B is formed of an opaque polybutene pipe, for example.

The downstream end of the second vertical pipe member 36B in the drainage direction is connected via a joint 42 to a junction joint 40 attached to the middle part of the drainage vertical pipe 12.

In this embodiment, the piping portion arranged horizontally on the floor slab 14, specifically the horizontal portion 26B of the first L-shaped piping member 26 and the horizontal pipe member 28, correspond to the horizontal pipe 46 of the siphon drain pipe 44, and the first vertical pipe member 36A and the second vertical pipe member 36B correspond to the vertical pipe 48 of the siphon drain pipe 44.

(Configuration of the recessed portion)
2, the drop-in portion 50, which is an example of a joint of the present invention, includes a main pipe portion 52 and a lid 58 serving as a blocking member. The main pipe portion 52 and the lid 58 of this embodiment are formed of synthetic resin.

(Main body tube)
The main body pipe portion 52 is, for example, made of synthetic resin and is a joint body curved into a substantially L-shape as shown in Figures 2 and 3. The main body pipe portion 52 includes a cylindrical first connection portion 60 extending along the axial direction of the horizontal pipe 46 and a cylindrical second connection portion 62 extending along the axial direction of the vertical pipe 48.

The main body pipe 52 also has walls 52A, 52B, 52D and a bent portion 52C that connect the downstream end of the first connection portion 60 and the upstream end of the second connection portion 62. The first connection portion 60 and the second connection portion 62, which are arranged on both sides of the bent portion 52C, extend in directions perpendicular to each other.

The joint 32 is connected to the first connection part 60. The type of joint 32 does not matter as long as it can connect the main body pipe part 52 and the horizontal pipe 46, and the joint 32 may be a so-called one-touch joint. The inner diameter of the second connection part 62 is formed to be larger than the inner diameter of the main body pipe part 52, and the upstream end of the vertical pipe 48 can be inserted into this second connection part 62.

In this way, the drop-in section 50 with a cleaning port of the siphon drain pipe 44 in this embodiment connects the horizontal pipe 46 and the vertical pipe 48, and functions as a bent pipe that drops the piping that extends in a substantially horizontal direction (lateral direction) vertically downward.

As shown in FIG. 2, the bent portion 52C is shaped like a curved cylinder cut in half, and forms the inner circumferential surface of the drainage flow path. A step portion 52CA is formed on both sides of the upper end surface of the bent portion 52C when viewed from the center line CL of the main body pipe portion 52. The bent portion 58C of the lid 58 is placed on this step portion 52CA.

The wall portion 52A is a wall portion that rises upward from the outside of each step portion 52CA in the bent portion 52C, and is arranged along the axial direction of the main body pipe portion 52 in a plan view.

The wall portion 52B is a wall portion that connects one end (the end portion on the second connection portion 62 side) of the two wall portions 52A, and is formed in an arc shape in a plan view. Also, as shown in FIG. 3, the wall portion 52B is raised upward from the second connection portion 62. The upper end portion of the second connection portion 62 is formed with a flange 62CA on which the bent portion 58C (the portion integrated with the wall portion 58B) of the lid 58 is placed. The flange 62CA is a portion that protrudes radially inward from the second connection portion 62.

As shown in FIG. 2, the wall portion 52D is a wall portion that connects the other ends (ends on the first connection portion 60 side) of the two wall portions 52A, and is formed in a straight line in a plan view. The first connection portion 60 is connected to the end of this wall portion 52D and the bent portion 52C.

The main body pipe 52 is formed in a cylindrical shape from the first connection part 60 to the second connection part 62. A cleaning port E is formed above the bent part 52C, and the flow path is not blocked. In the present invention, the term "cylindrical" includes configurations that have such an open cleaning port E.

(Cleaning port of main body pipe)
The area surrounded by the walls 52A, 52B, and 52D forms a cleaning port E in the main body pipe 52. The cleaning port E is an opening formed to cover the bent portion 52C in a plan view. The cleaning port E is shaped to follow the axial direction of the main body pipe 52 and is generally rectangular.

The inside of the first connection part 60 and the second connection part 62 can be accessed from the cleaning port E. In other words, a cleaning tool such as a cleaning nozzle inserted into the inside of the main body pipe part 52 from the cleaning port E can reach the inside of the horizontal pipe 46 (see FIG. 3, etc.) via the first connection part 60. Similarly, a cleaning tool can reach the inside of the vertical pipe 48 (see FIG. 3, etc.) via the second connection part 62.

(lid)
2, the lid 58 is a closing member that closes the cleaning port E of the main body pipe portion 52 from above. The lid 58 includes walls 58A, 58B, 58D, a bent portion 58C, and a locking portion 58E.

As shown in FIG. 3, the bent portion 58C is shaped like a curved cylinder cut in half, and forms the inner circumferential surface of the drainage flow path. As shown in FIG. 2, the lower end surface 58CA of the bent portion 58C is placed on the step portion 52CA of the bent portion 52C in the main pipe portion 52. In this way, the bent portion 52C in the main pipe portion 52 and the bent portion 58C in the lid 58 form a drainage flow path with a circular planar cross section. Note that a gasket or the like may be placed between the step portion 52CA of the bent portion 52C and the lower end surface 58CA of the bent portion 58C in consideration of watertightness.

The wall 58A is a wall that rises upward from the lower end surface 5CA of the bent portion 58C, and is disposed along the axial direction of the bent portion 52C in a plan view (and along the axial direction of the main body pipe portion 52 when the lid 58 is attached to the main body pipe portion 52).

The wall portion 58B is a wall portion that connects one end of the two wall portions 58A (the end portion on the second connection portion 62 side of the main body pipe portion 52) and is formed in an arc shape in a plan view. In addition, the lower end portion of the wall portion 58B (the portion integrated with the bent portion 58C) is placed on the flange 62CA of the main body pipe portion 52 and is raised upward from the flange 62CA as shown in FIG. 3.

As shown in FIG. 2, the wall portion 58D is a wall portion that connects the other ends of the two wall portions 58A (the ends of the main body pipe portion 52 on the first connection portion 60 side) and is formed in a straight line in a plan view.

With the above configuration, a bent portion 58C is formed at the lower end of the area surrounded by the walls 58A, 58B, and 58D, and this bent portion 58C is positioned to cover the bent portion 52C in the main body pipe portion 52, thereby closing the cleaning port E in the main body pipe portion 52. In addition, the bent portion 58C is shaped to follow the axial direction of the main body pipe portion 52 and is generally rectangular.

(Lid locking portion and flange)
The locking portion 58E is formed over the entire upper end portion of the wall portions 58A, 58B, and 58D. The locking portion 58E includes a protruding portion 58EA protruding outward from the wall portions 58A, 58B, and 58D, and a folded-back portion 58EB folded back downward from the tip of the protruding portion 58EA.

When the lid 58 is attached to the main body tube 52, the walls 58A, 58B, and 58D of the main body tube 52 are sandwiched between the folded portion 58EB of the lid 58 and each of the walls 58A, 58B, and 58D.

When the lid 58 is attached to the main body tube 52, a packing S is sandwiched between the protruding portion 58EA of the lid 58 and the upper end surfaces of the walls 58A, 58B, and 58D of the main body tube 52. The packing S is a gasket (flat packing) made of rubber or silicon. The packing S may also be an O-ring.

The protruding portion 58EA forms the approximate outer shape of the lid 58 in plan view. The protruding portion 58EA and the lid 58 are formed larger than the bent portion 58C in plan view, and are shaped to follow the axial direction of the main body pipe portion 52, being approximately rectangular. The lid 58 also has a similar shape to the bent portion 52C of the main body pipe portion 52 in plan view.

Flanges 59A and 59B, which are an example of a fixing portion in the present invention, are formed on the folded portion 58EB of the lid 58. The flanges 59A and 59B are formed at positions that overlap the flanges 54A and 54B of the main body tube portion in a plan view. In addition, through holes H2 that penetrate in the vertical direction are formed in these flanges 59A and 59B.

When the lid 58 is attached to the main body pipe 52, the through holes H2 of the flanges 59A and 59B are connected to the through holes of the flanges 54A and 54B, respectively. The lid 58 is fixed to the main body pipe 52 by screwing the bolt B into the female threaded portion H1 of the main body pipe 52.

(soiling detector)
A reflection-type optical sensor 80 as an example of a pipe internal condition detection device is attached to the outer surface of the first vertical pipe member 36A. As shown in Fig. 4, the reflection-type optical sensor 80 irradiates light from a light source (not shown) toward the inside of the pipe, and receives light reflected by dirt 82 attached to the inner surface (inner peripheral surface of the pipe) of the first vertical pipe member 36A, i.e., the reflected light, with a light receiving element (not shown). The light receiving element transmits light amount data of the incident light to a notification means 84 provided in the house shown in Fig. 1. The light amount data can be transmitted to the notification means 84, for example, by wire or wirelessly.

As shown in FIG. 1, the notification means 84 includes a built-in server (computer) 86 that processes light quantity data, etc., and is also provided with a warning lamp 88 that notifies of contamination. In this embodiment, the reflective optical sensor 80 and the server 86 constitute the pipe condition detection device of the present invention.

As shown in FIG. 5, a pair of electrodes 90 are attached to the lower side of the inner circumferential surface of the horizontal pull tube member 28 with a gap therebetween. The pair of electrodes 90 are connected to the notification means 84, and a predetermined voltage can be applied to the pair of electrodes 90.

The notification means 84 applies a voltage to a pair of electrodes 90, and if a current flows between the electrodes, it determines that wastewater is flowing inside the vertical pipe 48, and if no current flows between the electrodes, it determines that wastewater is not flowing inside the vertical pipe 48.

(Action, Effect)
Next, the operation and effects of the siphon drainage system 10 of this embodiment will be described.
(1) The notification means 110 applies a voltage to the pair of electrodes 90 during a predetermined time period, for example, once a day, and determines whether or not wastewater w is flowing inside the upright pipe 48.

(2) If it is determined that wastewater w is flowing inside the vertical pipe 48, the application of voltage is stopped, and voltage is applied again after a preset time has elapsed, or voltage is applied continuously, and light is not emitted from the light source of the reflective optical sensor 80 until it is determined that no current flows between the pair of electrodes 90, i.e., that no wastewater w is flowing inside the vertical pipe 48.

(3) When it is determined that no current flows between the pair of electrodes 90, the notification means 84 causes the light source of the reflective optical sensor 80 to emit light. Then, the light receiving element of the reflective optical sensor 80 outputs light amount data of the incident reflected light to the notification means 84.

(4) Here, if there is no dirt 82 attached to the inside of the vertical pipe 48 or if there is only a small amount of dirt 82 attached to the inside of the vertical pipe 48, the amount of reflected light is small, and if the amount of dirt 82 attached to the inside of the vertical pipe 48, in other words the degree of accumulation, is large, the amount of reflected light is large.
For this reason, the notification means 84 inputs data on the amount of reflected light from the light receiving element, and when the amount of reflected light exceeds a preset threshold, it determines that a certain amount of dirt 82 has adhered and accumulated, and turns on or blinks the warning lamp 88. As a result, by looking at the warning lamp 88, the user can easily know whether the inner wall surface of the vertical pipe 48 of the siphon drain pipe 44 is dirty or not, without having to visually check the inner wall surface of the pipe.

It has been found that when the siphon drainage system 10 is used for a long period of time, dirt 82 tends to accumulate more easily on the upstream side of the upright pipe 48 than on the downstream side. For this reason, it is preferable to provide the reflective optical sensor 80 on the upstream side of the upright pipe 48, and as an example, it is preferable to provide the sensor in the upper 1/3 of the total length L (see FIG. 1) of the upright pipe 48 divided into three equal parts.

In addition, if the amount of light is measured while the wastewater is flowing, the amount of light may not be stable due to the influence of foreign matter moving through the wastewater. Therefore, in order to avoid the influence of foreign matter moving through the wastewater, it is preferable to measure the amount of light when the wastewater is not flowing, and it is also preferable to measure the amount of light when the wastewater is not in contact with the vertical pipe 48.

(Cleaning the siphon drain pipe)
In the drop-in section 50 according to the embodiment of the present invention, as shown in Fig. 2, the cleaning port E is disposed so as to cover the bent section 52C in the main body pipe section 52. This makes it easy to clean both the pipe materials (the vertical pipe 48 and the horizontal pipe 46 shown in Fig. 3) connected to one end and the other end of the main body pipe section 52.

As shown in FIG. 2, a light-shielding member 70 can be attached to the transparent lid 58. When visually inspecting the drainage condition in the drainage path, the light-shielding member 70 can be peeled off. This eliminates the need to remove the lid 58, making visual inspection easier. Furthermore, attaching the light-shielding member 70 can prevent light from entering the piping path, thereby preventing the growth of algae and other organisms in the piping path.

In the siphon drainage system 10 of this embodiment, the siphon drainage pipe 44 can be cleaned as follows.
When cleaning the inside of the siphon drain pipe 44, drainage from the plumbing fixture 20 is stopped, and as shown in Fig. 2, the cover 58 is removed from the drop-in portion 50 to expose the cleaning port E. By exposing the cleaning port E, dirt 82 inside the pipe can be directly and visually observed through the cleaning port E.

Then, the cleaning nozzle (not shown) of the cleaning machine is inserted into the inside of the siphon drain pipe 44 from the cleaning port E, and the cleaning nozzle is moved inside the siphon drain pipe 44 while spraying water from the nozzle. This cleans the inside of the siphon drain pipe 44 and removes dirt 82.

In this embodiment, whether or not wastewater w is flowing inside the vertical pipe 48 is detected by whether or not a current flows between the electrodes 90. However, as shown in FIG. 6, an ultrasonic level sensor 92 can be provided at the top of the horizontal pipe member 28, and ultrasonic waves can be transmitted directly below to detect the presence or absence of wastewater w.

In this embodiment, the warning lamp 88 can be used to know whether the inner wall surface of the vertical pipe 48 is dirty or not. If the inner wall surface is dirty, a message indicating that the inner wall surface is dirty may be displayed on an LCD display panel or a buzzer may sound.

In addition, in this embodiment, the notification means 84 has a built-in server 86 that processes the light intensity data, but the light intensity data may be transmitted to an external server 94 (see FIG. 1) installed outside the home, for example, in an apartment management office, a home or apartment management company, a maintenance company that performs home maintenance, or a drainage system cleaning company, and the light intensity data may be processed by the external server 94. In this case, the notification means 84 inside the home is provided with a transmitter 97 and a receiver 98 for transmitting and receiving data.

In this way, by transmitting light intensity data and the like to an external server 94 and processing it there, the in-home notification means 84 does not require a server 86, and the notification means 84 can be simplified. Also, because the amount of light intensity data transmitted from the house is very small, it is possible to utilize other communication methods, such as LPWA (Low Power Wide Area: a communication method that realizes long-distance communication while reducing power consumption), as a communication method for remote monitoring, without using a high-speed communication line such as an LET line.

When the external server 94 detects dirt, it may send a signal to the notification means 84 in the house to turn on the warning lamp 88. The notification means 84 does not have to be installed in the house. For example, the external server 94 may be connected to a terminal or the like installed outside the house, and a message indicating that the interior wall surface is dirty may be displayed on the screen of the terminal.

The light intensity data does not have to be checked constantly, and may be checked, for example, once a day to once a week. Then, by checking the change in dirt over time, it is possible to calculate the accumulation of dirt. This makes it possible, for example, to know in advance the day when the amount of dirt (degree of accumulation) will reach a threshold value (for example, the day when cleaning will be performed) before the amount of dirt (degree of accumulation) exceeds a threshold value.

Therefore, if the light intensity data is sent to an external server 94, even if the resident does not notice the dirt alert, the state of dirt can be understood by businesses, such as the management office of the apartment building, the management company for the house or apartment building, the maintenance company that maintains the house, the drainage system cleaning company, etc. This means that the resident will not miss the time for cleaning.

In addition, with the siphon drainage system 10 of this embodiment, cleaning can be performed only after a warning is issued, eliminating the need for regular visual inspections, which can significantly reduce the burden on residents and contractors.

Second Embodiment
Next, a siphon drainage system 10 according to a second embodiment of the present invention will be described with reference to Fig. 7. Note that the same components as those in the above-mentioned embodiment are given the same reference numerals, and the description thereof will be omitted.

In this embodiment, a transmissive optical sensor 95 is provided in the first vertical tube member 36A instead of the reflective optical sensor 80. The transmissive optical sensor 95 is connected to a notification means 84 (not shown in FIG. 7), and as an example, a light source 95A is attached to one radial side of the first vertical tube member 36A, and a light receiving element 95B is attached to the opposite side of the light source 95A across the center line of the first vertical tube member 36A.

In this embodiment, the light emitted from the light source 95A passes through the center line of the first vertical tube member 36A and enters the light receiving element 95B.

Here, if there is no dirt 82 or only a small amount of dirt 82 attached to the inner surface of the first vertical tube member 36A, the amount of light received by the light receiving element 95B is large, and if there is a large amount of dirt 82, the amount of light received by the light receiving element 95B is small.

For this reason, the notification means 84 inputs light quantity data from the light receiving element 95B, and when the light quantity is equal to or less than a preset threshold, it determines that a certain amount of dirt has adhered and accumulated, and turns on or blinks the warning lamp 88. This allows the user to easily know whether the inner wall surface of the pipe of the drop-in section 50 is dirty or not by looking at the warning lamp 88 while in the house.

Third Embodiment
Next, a siphon drainage system 10 according to a third embodiment of the present invention will be described with reference to Fig. 8. The same components as those in the above-described embodiment are given the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 8, in the siphon drainage system 10 of this embodiment, instead of a reflective optical sensor 80, a camera 96 including an imaging element such as a CCD, a lens system, and lighting (lamp) is provided outside the first vertical pipe member 36A. In this embodiment, the optical axis of the camera 96 is set at a right angle to the center line of the first vertical pipe member 36A. The lighting may be provided outside the first vertical pipe member 36A at a position different from the installation position of the camera 96.

In this embodiment, the state of the first vertical pipe member 36A is photographed with the camera 96, and the amount (degree of accumulation) of dirt 82 can be detected by image processing or the like.

[Other embodiments]
Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and it goes without saying that the present invention can be implemented in various modified forms without departing from the spirit and scope of the present invention.

The light emitted from the light source in the optical sensor is not limited to visible light, and may be light other than visible light, such as infrared light. When the light emitted from the light source is infrared light, the first vertical tube member 36A does not need to look transparent as long as the infrared light can easily pass through it. In other words, if the first vertical tube member 36A is made of a resin material that easily transmits infrared light, a transparent resin material does not need to be used. Also, the portion that transmits infrared light may be made thin so that the infrared light can easily pass through.

In the above embodiment, an alert was issued when the amount of reflected light or transmitted light corresponding to the amount of dirt (degree of accumulation) exceeded a preset threshold (or fell below a preset threshold). However, for example, light intensity may be measured at a predetermined time interval, and an alert may be issued when there is a sudden change in the amount of light, regardless of the threshold.

10...Siphon drainage system, 20...Water-related equipment, 36A...First vertical pipe member (light-transmitting section), 50...Drop-in section, 44...Siphon drainage pipe, 46...Horizontal pipe, 48...Vertical pipe, 80...Reflective optical sensor (internal pipe condition detection device), 84...Notification means, 86...Server (internal pipe condition detection device), 95...Transmissive optical sensor (internal pipe condition detection device), 95A...Light source, 95B...Light-receiving element, 96...Camera (internal pipe condition detection device)

Claims (6)

A siphon drain pipe including a horizontal pipe extending horizontally and draining water from a water-related fixture, a vertical pipe provided downstream of the horizontal pipe and extending vertically, and a drop-in portion disposed between the horizontal pipe and the vertical pipe;
A pipe internal condition detection device that detects the internal condition of the vertical pipe and outputs condition detection data;
a notification means for notifying an internal state of the vertical pipe based on the state detection data;
having
The drop-in portion is a drainage system having a main pipe portion curved into an approximately L shape and having a cleaning port, and a closing member that closes the cleaning port from above . The vertical pipe is provided with a light transmitting portion through which light passes,
The pipe internal condition detection device optically detects the internal condition of the vertical pipe through the light transmitting portion.
2. The drainage system of claim 1. The pipe internal condition detection device is configured to include a transmission type optical sensor having a light source that irradiates light toward the light transmitting portion and a light receiving element that receives light that has transmitted through the light transmitting portion.
3. The drainage system of claim 2. The pipe internal condition detection device includes a reflective optical sensor that irradiates light from the light transmitting portion toward the inside of the vertical pipe and receives light reflected by the inner surface of the vertical pipe.
3. The drainage system of claim 2. The pipe internal condition detection device is configured to include a camera that captures an image of the inside of the vertical pipe through the light transmitting portion.
3. The drainage system of claim 2. The drainage system according to claim 1 , wherein a drainage flow path having a circular planar cross section is formed by the bent portion of the main pipe portion and the bent portion of the blocking member.