JP6483882B2 - Water stop plug used in refurbishment method for automatic cleaning equipment - Google Patents

Description

  The present invention relates to an automatic cleaning apparatus that detects a user and automatically cleans a toilet, and is disposed outside a wall and at a position above the toilet from a wall-embedded unit in which a sensor and a piston valve are disposed in the wall. The present invention relates to a water stop plug used in a refurbishment method for refurbishing an external type unit.

  2. Description of the Related Art Conventionally, an automatic cleaning apparatus for automatically cleaning a male urinal using a wall-embedded unit in which a sensor and a piston valve are disposed in a wall as illustrated in FIGS. 1 and 2 is put into practical use. Has been.

  After that, due to the technical improvement of the toilet manufacturer, a structure in which the sensor is directly embedded in the urinal as disclosed in Patent Document 1: Japanese Patent Laid-Open No. 2008-031825 and Patent Document 2: Japanese Patent Laid-Open No. 2008-248549. Also appeared.

JP 2008-031825 A JP 2008-248549 A

  However, in the automatic cleaning apparatus illustrated in FIG. 1 and FIG. 2 that already belongs to the old class, sensor failure has occurred not a little over time, but the manufacture and provision of the sensor is terminated. Facing a problem. In other words, when the sensor fails, it is impossible (or difficult) to return to the current state, so the automatic cleaning function cannot be maintained, and the urinal itself is replaced with one having the configuration exemplified in Patent Documents 1 and 2. There will be a problem of large-scale renovation and huge costs, such as having to do.

  The present invention has been made in view of the above circumstances, and in the case where a sensor of an automatic cleaning device using a wall-embedded unit in which a sensor and a piston valve are disposed in a wall fails, a large-scale renovation and a large expense In order to suppress the generation, a sensor and a piston valve are disposed outside the wall and at a position above the toilet bowl by realizing a method of forming a simple flow path while leaving the main body of the wall-embedded unit. It is an object of the present invention to provide a water stop plug used in a refurbishment method that can be refurbished into a type external type unit or a manual type external type unit provided with a manual button and a piston valve.

  As an embodiment, the above-described problem is solved by a solution as disclosed below.

  The water stop plug according to the present disclosure includes a main flow path that allows the wash water to flow from the intake port to the water supply port, a piston valve that performs water flow and water stop of the main flow path, and a cylinder that serves as a moving space for the piston valve. The chamber communicates with a first opening hole formed at one end of the cylinder chamber on the rear end side opposite to the front end where the piston valve valve body is provided. A sub-flow path communicating through a second opening hole formed at a position downstream of the position where the piston valve is disposed in the main flow path; and an electromagnetic valve for opening and closing the sub-flow path; And a drive control unit for driving the electromagnetic valve according to a sensor for detecting a user and a detection signal of the sensor in the wall or in the vicinity of the wall to automatically clean the toilet. As a refurbishment method for automatic cleaning equipment Removing the piston valve from the cylinder chamber after removing the sealing lid that seals the open end of the cylinder chamber from the main body, and removing all or part of the sub-flow path from the main body. A step of removing and exposing the second opening hole, and a waterproof cover for closing the opening end portion is attached to the cylinder chamber in a state where the piston valve is removed to seal the opening end portion. Performing a step of attaching a water sealing component to the first opening hole to seal the first opening hole, attaching a water stop plug to the second opening hole, and sealing the second opening hole. A water stop plug used in a refurbishment method for refurbishing the main flow path into a simple flow path that does not have an opening / closing function. Has a sealing member that adheres closely to the inner wall surface of the opening hole It is provided with a push screw that is inserted into a screw hole formed on the rear end side with respect to the arrangement position of the sealing member so that the main body portion penetrates the inner wall surface of the second opening hole. In this case, it has a first small diameter portion at a position where the tip of the push screw can come into contact, and has a second small diameter portion at a position closer to the rear end portion than the first small diameter portion. To do.

  A wall-embedded unit in which a sensor and a piston valve are disposed in a wall (or in the vicinity of a wall) in an automatic cleaning apparatus that performs automatic cleaning of a toilet illustrated as a male urinal by using the water stop plug of the disclosure Can be made into a simple flow path while leaving the main body portion. As a result, the wall-embedded unit can be refurbished into a sensor-type external type unit or a manual-type external type unit that is disposed outside the wall and above the toilet. Therefore, in the event of a sensor failure in the wall, it is possible to suppress large-scale refurbishment that requires the toilet bowl to be replaced and a large amount of expenses, and simple and low-cost refurbishment. It becomes feasible.

It is the schematic (perspective view) which shows the example of the automatic washing apparatus provided with the wall embedding type unit which concerns on the conventional embodiment. It is explanatory drawing (figure of a side direction) explaining the structural example of the automatic washing apparatus shown in FIG. It is explanatory drawing (figure of a perspective view) explaining the remodeling method which concerns on embodiment of this invention. It is explanatory drawing (figure of a perspective view) explaining the remodeling method which concerns on embodiment of this invention. It is explanatory drawing (figure of a front direction) explaining the remodeling method which concerns on embodiment of this invention. It is the schematic (perspective view) which shows the example of the main-body part of the wall-embedded unit shown in FIG. It is explanatory drawing (figure of a front direction) explaining the remodeling method which concerns on embodiment of this invention. It is the schematic (perspective view) which shows the example of the automatic washing apparatus provided with the external type unit which applied the remodeling method which concerns on embodiment of this invention, and was remodeled. It is explanatory drawing (figure of a side direction) explaining the structural example of the automatic washing apparatus shown in FIG. It is the schematic (plan view, front view, bottom view) which shows the example of the water stop plug (1st embodiment) used for the renovation method which concerns on embodiment of this invention. It is the schematic (front view) which shows the example of the tension rod used for the water stop plug shown in FIG. It is the schematic (front view) which shows the state by which the tension rod shown in FIG. 11 was fixed to the water stop plug shown in FIG. It is explanatory drawing (figure of a front direction) explaining the remodeling method which concerns on embodiment of this invention. It is the schematic (perspective view) which shows the example of the water stop plug (2nd embodiment) used for the remodeling method which concerns on embodiment of this invention. It is the schematic (perspective view) which shows the other example of the main-body part of the wall embedding type unit shown in FIG.

(Remodeling method)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof may be omitted.

  First, in an automatic cleaning apparatus that performs automatic cleaning of a toilet illustrated as a male urinal, a wall-mounted unit in which a sensor and a piston valve are disposed in a wall (or in the vicinity of a wall such as a wall surface) The body of a wall-embedded unit for retrofitting to a sensor-type external type unit in which a sensor and a piston valve are arranged outside or in the upper position of the toilet bowl or a manual type external type unit in which a manual button and a piston valve are arranged A method for realizing a simple flow path while leaving the portion will be described.

  As described above, FIG. 1 and FIG. 2 are examples of the conventional automatic cleaning device 2 (2A), and a main body 11 having a sensor for detecting a user and a piston valve that is opened and closed by a signal based on the sensor. Is provided with a wall-embedded unit 3 disposed in the wall.

  First, as shown in FIG. 3, a step of removing the front plate 12 having the sensor window of the wall-embedded unit 3 from the conventional automatic cleaning device 2 (2A) is performed (step S1). The front plate 12 is made of metal and has a sensor window 14 at the center, and a sensor 16 for detecting a user is installed on the back surface (inside the wall) of the sensor window 14. Reference numeral 17 denotes a drive control unit that performs drive control of an electromagnetic valve, which will be described later, based on a sensor signal. In addition, the front plate 12 is normally fixed using the magnet 22 with respect to the frame member 18 currently fixed to the wall surface WL.

  Next, as shown in FIG. 3, a process of removing the control wiring 24 and the power supply wiring 26 connected to the drive control unit 17 of the wall-embedded unit 3 is performed (step S2). Accordingly, the front plate 12, the sensor 16, and the drive control unit 17 can be cut off from the wall-embedded unit 3 and removed. Here, as the power supplied to the power supply wiring 26, a commercial power supply of AC 100V (100V type) or a DC power supply (battery type) using a battery is used. In the present embodiment, description will be made with reference to an example of a 100V type.

  Next, as shown in FIG. 4, after closing the stop cock 30 of the main flow path 28 of the wall-embedded unit 3 and taking fountain prevention measures, the opening end 31 a of the cylinder chamber 31 is sealed from the main body 11. Next, a step of removing the sealing lid 27 and removing the piston valve 32 that moves through the cylinder chamber 31 and performs water flow and water stoppage of the main flow path 28 from the cylinder chamber 31 is performed (step S3). Here, the main flow path 28 takes in water from the water intake 35 connected to the water supply pipe 34 shown in FIG. 2, passes through the main body 11, and supplies water to the drain pipe 36 connected to the water supply opening 37. It is. In the main body 11, the main flow path 28 is a flow path that allows the flow from the opening 28 a to the opening 28 b through the cylinder chamber 31. Therefore, the piston valve 32 moves to the back side (the side opposite to the opening end portion 31a), and the valve body 33 provided at the tip end portion 32a of the piston valve 32 becomes the inner wall (valve seat) on the back side of the cylinder chamber 31. ) By adhering to 31b, the main flow path 28 is closed and the washing water is stopped. On the other hand, the piston valve 32 moves to the opening end portion 31a side, and the valve body 33 at the tip end portion 32a of the piston valve 32 is separated from the inner wall (valve seat) 31b on the back side of the cylinder chamber 31, whereby the main flow path 28 is opened. Accordingly, the washing water is passed from the opening 28a to the opening 28b. As described above, the piston valve 32 moves in the cylinder chamber 31, thereby obtaining a water flow and water stop action for the wash water that flows from the water supply pipe 34 to the toilet 1 through the drain pipe 36.

  Next, as shown in FIG. 5, the sub-flow path 38 and the sub-flow path 38 for operating the piston valve 32 by changing the pressure acting on the rear end portion 32b of the piston valve 32 of the wall-embedded unit 3 are provided. A step of removing the solenoid valves 42 to be opened and closed and exposing a second opening hole 15 described later is performed (step S4).

  Here, the configuration of the auxiliary flow path 38 included in the wall-embedded unit 3 will be described with reference to FIGS. 5 and 6 (schematic diagram of the main body 11). One end of the sub flow path 38 is formed at a position on the main flow path 28 (here, the cylinder chamber 31) on the rear end portion 32 b side of the piston valve 32 (that is, a position on the cylinder chamber 31 on the open end portion 31 a side). In addition, the main channel 28 communicates with the first opening 13. The other end of the main flow path 28 is formed through the second opening hole 15 formed at a position downstream of the position where the piston valve 32 is disposed (that is, the position where the opening 28b is provided). 28 is communicated. The electromagnetic valve 42 is configured such that an internal piston (not shown) can be operated by opening / closing a power source to open and close the auxiliary flow path 38.

  The primary action of the sub-flow path 38 having the above-described configuration is that when the sensor 16 senses a user, the drive control unit 17 drives (excites) the electromagnetic valve 42 by the sensing signal. Will be opened. At this time, since the secondary flow path 38 communicates with the main flow path 28, the water supply port 37, and the drain pipe 36 via the second opening hole 15, the pressure in the secondary flow path 38 is released to the atmosphere. . Accordingly, since the pressure on the rear end portion 32b side of the piston valve 32 is reduced through the first opening hole 13, the piston valve 32 is opened in the cylinder chamber 31 from the back side (inner wall 31b side) to the opening end portion 31a side. Move to. As a result, the main flow path 28 is opened, and the cleaning water flows through the main flow path 28 as described above. Incidentally, as a subsequent operation, when the electromagnetic valve 42 is demagnetized, the sub flow path 38 is closed. Here, the piston valve 32 is provided with a small hole (not shown) that communicates the front end portion 32a side and the rear end portion 32b side, and gradually moves from the opening 28a to the rear end portion 32b side of the piston valve 32 through the small hole. And the cleaning water will fill up. Further, a return spring (not shown) is provided at the rear end portion 32 b of the piston valve 32, and the valve body 33 of the tip end portion 32 a of the piston valve 32 is caused to act on the inner wall (valve) on the far side of the cylinder chamber 31 by their action. Since the seat is in contact with the seat 31b, the main flow path 28 is closed and the flow of the washing water is stopped.

  Next, the following treatment is applied to the location where the piston valve 32 of the main flow path 28 is removed and the location where the sub flow path 38 is removed, so that the main flow path 28 has a simple flow path that does not have an opening / closing function. To implement.

  First, as shown in FIG. 7, as a treatment for the place where the piston valve 32 is removed, a water stop cover 44 is attached to the opening end 31 a of the cylinder chamber 31 to seal the cylinder chamber 31 (opening end 31 a). A process to be performed is performed (step S5). The water blocking lid 44 is a part that closes the opening end 31a (without sealing the first opening hole 13), and if necessary, a water sealing part that seals the first opening hole 13 is used. It may be provided separately.

  Next, as shown in FIG. 7, as a treatment for the place where the secondary flow path 38 is removed and the second opening hole 15 is exposed, a water stop plug 46 is attached to the second opening hole 15, 15 is performed (step S6). According to this, the second opening hole 15 communicating with the main flow path 28 can be sealed. The detailed configuration of the water stop plug 46 will be described later.

  As described above, the water supply pipe 34 and the drain pipe 36 are connected by the main flow path 28 as a simple flow path (pipe) having no opening / closing mechanism therebetween. In other words, the wall-embedded unit 3 in which the sensor and the piston valve are disposed in the wall can be simplified in the main flow path 28 while the main body 11 remains. As a result, the wall-embedded unit can be refurbished into a sensor-type external type unit or a manual-type external type unit that is disposed outside the wall and above the toilet.

  As an example, FIG. 8 and FIG. 9 show an example of refurbishing the automatic cleaning device 2 (2B) including an external type unit 5 in which a sensor and a piston valve are disposed outside the wall and above the toilet 1. In this example, in the automatic cleaning apparatus 2 (2A) using the 100V type wall-embedded unit 3, the power supply wiring 26 is connected to the adapter 52 and pulled out from the wiring passage portion 72 of the front plate 66 to the outside of the wall. Is added to the automatic cleaning device 2 (2B) using the 100V type external mold unit 5 for renovation. In addition, although not shown, the external unit 5 may be a battery type or a manual type.

  As described above, the automatic cleaning apparatus for automatically cleaning the toilet bowl includes a wall-embedded unit in which the sensor and the piston valve are disposed in the wall (or in the vicinity of the wall) when, for example, the sensor in the wall breaks down. The automatic cleaning apparatus 2 (3A shown in FIG. 1 and FIG. 2 as an example) includes an external type unit 5 in which a sensor and a piston valve are disposed outside the wall and above the toilet 1, or a manual button and It is possible to retrofit the automatic cleaning apparatus 2 (as an example, 2B shown in FIGS. 13 and 14) having a manual external type unit (not shown) in which a piston valve is provided.

  At that time, the frame member 18, the main body 11 (particularly the main flow path 28), the water supply pipe 34, the drain pipe 36, etc. in the wall-embedded unit 3 can be used as they are. There is no need to replace or newly install piping, the work for renovation can be simplified, and the parts cost and work cost can be greatly reduced.

(Water stop cover)
Then, the water stop lid | cover 44 used for said remodeling method is demonstrated.

  The water stop lid 44 has the same diameter and the same pitch as the screw portion (male screw portion) of the sealing lid 27 and can be screwed into the screw portion (female screw portion) of the opening end 31 a of the cylinder chamber 31. And a hole into which a rotary tool (hexagon wrench) used for screwing is inserted.

  According to this configuration, the water stop lid 44 can be fixed to the cylinder chamber 31 (opening end 31a), so that the opening end 31a of the cylinder chamber 31 can be sealed.

(Water stop plug)
Then, the water stop plug used for said remodeling method is demonstrated.

  First, the water stop plug 46 according to the first embodiment will be described. A plan view of the water stop plug 46 according to this embodiment is shown in FIG. 10A, a front view (half-sectional view) is shown in FIG. 10B, and a bottom view is shown in FIG. 10C. The water stop plug 46 is a member that seals the portion by fitting the tip end portion 46 a into the second opening hole 15. Therefore, it has the sealing member 47 which is fitted on the inner wall surface 15a of the 2nd opening hole 15, and is sealed by the position (site | part) by the side of the front-end | tip part 46a. As an example, the sealing member 47 is a rubber O-ring.

  According to this, the second opening hole 15 communicating with the main flow path 28 can be sealed. However, the pressure (water pressure) of the wash water flowing through the main flow path 28 may cause a problem that the water stop plug 46 comes out of the second opening hole 15 and fountains.

  Therefore, the water stop plug 46 has a first small diameter portion 46c having a smaller diameter than a portion adjacent in the axial direction at a position closer to the rear end portion 46b than the position where the sealing member 47 is disposed. Yes.

  According to this, in the case where the main body portion 11 includes the screw hole 11a formed so as to penetrate the inner wall surface 15a of the second opening hole 15, and the push screw 43 inserted through the screw hole 11a, By tightening the push screw 43 and bringing its tip into contact with the first small-diameter portion 46c, even if water pressure from the main flow path 28 acts on the tip 46a of the water stop plug 46, it comes out of the second opening hole 15. Can be prevented. For this purpose, the formation position of the first small diameter portion 46c is set to a position where it can come into contact with the tip of the push screw 43 in a state where the water stop plug 46 is fitted in the second opening hole 15. There is a need.

  However, when the main body 11 does not include the screw hole 11a and the push screw 43, or when the main body 11 cannot be used due to a malfunction or the like, the tip of the push screw 43 has the first small diameter as described above. It is not possible to adopt a method for preventing the water stop plug 46 from coming off using a configuration in which the water stop plug 46 is brought into contact with the portion 46c.

  Therefore, the water stop plug 46 is a tension rod 48 formed in a length capable of coming into contact with the upper inner surface of the case member 10 in which the main body portion 11 is accommodated at the rear end portion 46b (a front view is shown in FIG. 11). Has a fixing hole 46e that can be fixed. FIG. 12 shows a state in which the tension rod 48 is fixed (screwed here) to the fixing hole 46e of the water stop plug 46.

  According to this, as shown in FIG. 13, even when the main body 11 does not include the screw hole 11a and the push screw 43, or when the main body 11 cannot be used due to a malfunction or the like, as shown in FIG. By fitting the water stop plug 46 with the rod 48 fixed into the second opening hole 15 and then rotating the adjustment knob 49 fixed to the rod 48, the rod 48 rotates and stops. The length from the front end portion 46 a of the water plug 46 to the rear end portion (upper end portion) 48 b of the tension rod 48 is changed so that the rear end portion (upper end portion) 48 b of the tension rod 48 contacts the upper inner surface of the case member 10. By extending until contact, even if water pressure from the main flow path 28 acts on the distal end portion 46 a of the water stop plug 46, it can be prevented from coming out of the second opening hole 15.

  Thus, according to the water stop plug 46 according to the present embodiment, when the main body portion 11 includes the screw hole 11a and the push screw 43, the main body portion 11 does not include the screw hole 11a and the push screw 43. Even if it is provided or not provided, the second opening 15 can be sealed without providing separate dedicated products for any of the cases where it cannot be used due to problems or the like. Accordingly, it is possible to reduce the cost of parts, and to prevent parts from being mixed up and defective in renovation work.

  It should be noted that the water stop plug 46 is relative to the position adjacent to the axial direction at a position closer to the rear end portion 46b than the position where the first small diameter portion 46c is formed (for example, a position closer to the rear end portion 46b). Has a second small-diameter portion 46d having a small diameter.

  According to this, since the attachment / detachment tool (plier or the like) used when fitting the water stop plug 46 into the second opening hole 15 or removing it from the second opening hole 15 can be reliably locked, It is possible to prevent the attachment and detachment from becoming impossible or difficult due to the occurrence of the above.

  Next, the water stop plug 50 which concerns on 2nd embodiment is demonstrated. FIG. 14 shows a perspective view of the water stop plug 50 according to the present embodiment. This water stop plug 50 seals the second opening hole 15 in the case of a wall-embedded unit in which a main body 19 (shown in a perspective view in FIG. 15) is used instead of the main body 11. Here, the main body 19 has the same basic configuration and operation although the shape and the mounting structure of the electromagnetic valve are different from those of the main body 11 described above. FIG. 15 is a view corresponding to FIG. 6 described above, in which the sealing lid that seals the cylinder chamber 31 from the main body 19 and a part of the sub flow path and the electromagnetic valve that opens and closes the sub flow path are removed. It is in the state. Here, reference numerals 19 a (four locations) are screw holes for fixing the electromagnetic valve for opening and closing the sub-flow channel to the main body 19. In addition, the water-stop cover 44 can be used for sealing the cylinder chamber 31 similarly to the above example.

  First, the water stop plug 50 is a member that seals the portion by fitting the tip end portion 50a into the second opening hole 15. Therefore, it has the sealing member 47 which is fitted on the inner wall surface of the 2nd opening hole 15, and is sealed by the position (part | part) by the side of the front-end | tip part 50a. As an example, the sealing member 47 is a rubber O-ring.

  According to this, the second opening hole 15 communicating with the main flow path 28 can be sealed. However, similarly to the above-described example, there may be a problem that the water stop plug 50 comes out of the second opening hole 15 and fountains due to the pressure (water pressure) of the washing water flowing through the main flow path 28.

  Therefore, the water stop plug 50 has a flange-like portion 50c extending in the radial direction on the rear end portion 50b side, and is formed around the second opening hole 15 of the main body portion 19 in the flange-like portion 50c. An insertion hole 50d (here, through which a fixing screw (not shown) for fixing to the main body 19 can be inserted into a position that coincides with the position of a plurality of screw holes 19a (here, four places) for fixing the solenoid valve. In 4 locations).

  According to this, in the case where the main body 19 is provided with the screw hole 19a, a fixing screw (not shown) is inserted into the insertion hole 50d of the water stop plug 50 and screwed into the screw hole 19a to stop. The water plug 50 can be fixed to the main body 19. Therefore, even if the water pressure from the main flow path 28 acts on the distal end portion 50 a of the water stop plug 50, it can be prevented that the water stop plug 50 escapes from the second opening hole 15.

  The water stop plug 50 has a fixing hole (not shown) for fixing (screwing here) 51 a detachable handle (for example, using a bolt) at the rear end 50b. According to this, the operation | work which attaches / detaches the water stop plug 50 with respect to the main-body part 19 can be performed easily.

  As described above, according to the disclosed refurbishment method, and the water stop lid and water stop plug used in the refurbishment method, in the automatic cleaning apparatus that performs automatic cleaning of the toilet illustrated in a male urinal, Alternatively, the wall-embedded unit in which the sensor and the piston valve are disposed in the vicinity of the wall) can be made into a simple flow path while leaving the main body portion. As a result, the wall-embedded unit can be refurbished into a sensor-type external type unit or a manual-type external type unit that is disposed outside the wall and above the toilet. Therefore, in the event of a sensor failure in the wall, it is possible to suppress large-scale refurbishment that requires the toilet bowl to be replaced and a large amount of expenses, and simple and low-cost refurbishment. It becomes feasible.

  Needless to say, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the present invention.

DESCRIPTION OF SYMBOLS 1 Toilet bowl 2, 2A, 2B Automatic washing | cleaning apparatus 3 Wall embedding type unit 5 External type unit 10 Case member 11 Main-body part 11a Screw hole 12 Front plate 13 First opening hole 15 Second opening hole 16 Sensor 17 Drive control part 18 Frame member 19 Body 19a Screw hole 26 Power supply wiring 27 Sealing lid 28 Main flow path 31 Cylinder chamber 31a Open end 31b Inner wall (valve seat)
32 Piston valve 33 Valve body 34 Water supply pipe 35 Water intake port 36 Drain pipe 37 Water supply port 38 Sub-flow path 42 Solenoid valve 43 Push screw 44 Water stop cover 46 Water stop plug 46c First small diameter portion 46d Second small diameter portion 47 Sealing member 48 Stretching rod 49 Adjustment knob 50 Water stop plug 50c Gutter-shaped part 52 Adapter 66 Front plate 72 Wiring passage part WL Wall surface

Claims (1)

A main flow path that communicates from the water intake port to the water supply port and allows cleaning water to flow, a piston valve that performs water flow and water stoppage of the main flow path, a cylinder chamber that serves as a movement space for the piston valve, and one end of the cylinder The piston valve is communicated via a first opening hole formed at a position on the rear end side opposite to the front end where the valve body of the piston valve is provided, and the other end is connected to the piston valve in the main flow path. A main body provided with a sub-flow path communicating through a second opening hole formed at a position downstream of the position where the sub-flow path is disposed, and an electromagnetic valve for opening and closing the sub-flow path, As a refurbishment method for an automatic cleaning device that includes a sensor for detecting a user and a drive control unit for driving the electromagnetic valve according to a detection signal of the sensor in the wall or in the vicinity of the wall, and performs automatic cleaning of the toilet. , Front from the main body A step of removing the piston valve from the cylinder chamber after removing the sealing lid sealing the opening end of the cylinder chamber; and removing all or a part of the sub-flow path from the main body portion; A step of exposing an opening hole, a step of sealing the opening end portion by attaching a water-stopping lid that closes the opening end portion to the cylinder chamber with the piston valve removed; and Attaching a water sealing component to one opening hole and sealing the first opening hole; attaching a water stop plug to the second opening hole and sealing the second opening hole; and A water stop plug used in a refurbishment method for refurbishing the main flow path into a simple flow path having no opening and closing function,
It has a sealing member that is externally fitted to the tip end side and adheres closely to the inner wall surface of the second opening hole,
It is provided with a push screw that is inserted into a screw hole formed on the rear end side with respect to the arrangement position of the sealing member so that the main body portion penetrates the inner wall surface of the second opening hole. A first small-diameter portion at a position where the tip of the push screw can come into contact,
A water stop plug having a second small diameter portion at a position closer to the rear end portion than the first small diameter portion.

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