TWI421395B - Air suction device for toilet drainage channel - Google Patents

Description

Suction device for toilet drainage path

The present invention relates to a getter device for a toilet drainage path.

Patent Document 1 discloses an air suction device of a conventional toilet drainage path. The air suction device has a suction means for sucking air from a toilet drainage path connected to the lower side of the water seal portion of the toilet body. A water supply pipe for supplying the washing water to the bowl of the toilet body is connected with a bypass pipe. Here, the bypass pipe is provided with an ejector capable of generating a negative pressure. The suction means has: the injector; and a suction box connected between the injector and the drain path of the toilet. The inside of the suction box is divided into the outer side of the bellows (the first chamber) and the inner side of the bellows (the second chamber). The first chamber is connected to the ejector and the second chamber is connected to the toilet drain path. The water supply pipe on the upstream side of the bypass pipe is connected to the flush valve.

In the air suction device, when the flush valve is operated, the washing water is supplied to the water supply pipe for a certain period of time to supply the washing water to the bowl. At this time, since the washing water flows through the bypass pipe also in the ejector, the ejector sucks the air in the first chamber of the suction box. As a result, the bellows in the suction box is elongated. The air from the toilet drainage path is drawn into the second chamber during the expansion of the bellows. In this way, the inhalation stroke is performed to cause a siphon action.

Moreover, when a certain period of time elapses, the washing water is no longer circulated to the water supply pipe, and the supply of the washing water of the potty is finished. Therefore, the water supply pipe, the bypass pipe and the first chamber on the downstream side of the flushing valve are open to the atmosphere, and the bellows in the suction box is contracted. The air in the second chamber in the process of contraction of the bellows The path is discharged. The exhaust stroke is thus performed.

In the air suction device of the conventional toilet drainage path configured as described above, since the air is sucked from the toilet drainage path by the supply of the washing water to the toilet bowl, it is not necessary to particularly control the control means of the suction means. Therefore, the getter device is a simple configuration.

Patent Document 1: Japanese Patent Laid-Open No. Hei 7-54388

However, in the above-described conventional toilet suction path, the suction device supplies the washing water to the potty while performing the intake stroke, and when the amount of the washing water supplied to the bowl is small, the siphon action occurs. Therefore, the siphon effect becomes weaker as compared with the case where the water is supplied to the potty to make the water level in the bowl to a high degree, and the siphon effect is utilized by the potential energy. In this case, there is a possibility that the dirt from the toilet bowl draining path cannot be sufficiently discharged.

Further, due to the siphon action occurring in the intake stroke, substantially the washing water in the bowl is discharged to the toilet drainage path, and the water seal portion is terminated by the breakage. At this point, a broken seal will occur.

The present invention has been made in view of the above-described conventional circumstances, and it is possible to solve the problem by providing a suction device that can clean the toilet drainage path of the toilet in a good and quiet manner.

The air suction device of the toilet drainage path of the present invention is provided with a toilet drainage path provided on the flow side from the lower side of the water seal portion connected to the toilet body to suck air In the air suction device of the toilet drainage path, the air suction means has: a negative pressure generating means; and is connected between the negative pressure generating means and the toilet drainage path a suction box; further comprising: a control device configured to control an intake stroke of the suction box from the toilet drainage path, and an exhaust stroke of the suction box to discharge the air from the toilet drainage path The control device can perform the inhalation stroke after the toilet bowl of the toilet body is initially supplied with the washing water, and the exhaust stroke is performed before the supply of the washing water to the potty.

In the air suction device of the toilet drainage path of the present invention, after the supply of the washing water to the bowl is started, the intake stroke is performed in a state where the water level in the bowl becomes high, and the siphon action is performed. Therefore, it also utilizes the potential energy of the rising portion of the water level in the wash basin to be a powerful siphoning action, and the dirt can be reliably discharged to the toilet drainage path.

Further, if the exhaust stroke is performed before the supply of the washing water to the bowl, the air in the toilet drainage path is increased, and the discharge flow can be interrupted to terminate the siphon action. At this time, the water seal portion is not broken, and the sound seal is not broken.

Therefore, the air suction device of the toilet drainage path of the present invention can clean the toilet well and quietly.

In the air suction device of the present invention, it is preferable that the control device supplies the washing water to the bowl and performs the exhaust stroke between the discharge flow by the siphon action in the toilet drainage path. In this case, it is possible to surely end the siphoning action by implementing the venting stroke.

In the air suction device of the present invention, it is preferable that the control device performs the exhaust stroke before the supply of the washing water is resumed after the wash basin is temporarily stopped from supplying the washing water, and the water seal portion is formed in the potty. In this case, it can surely terminate the siphoning action and form a water seal having a certain water level.

In the air suction device of the present invention, the inside of the suction box is partitioned into the first chamber and the second chamber by a diaphragm that is movable in the vertical direction during installation, and the first chamber is connected to the negative pressure generating device, and Room 2 is connected to the toilet drainage path, which is preferred.

In this case, in order to draw a certain amount of air from the toilet drainage path in response to the internal volume of the suction box, the siphon action can be stably caused. Moreover, since the inside of the suction box is partitioned into the first chamber and the second chamber by the diaphragm, and only the second chamber is connected to the toilet drainage path, it can surely prevent the washing water containing the dirt or Air containing odor or the like enters the side of the negative pressure generating device.

The negative pressure generating means can be any type of construct as long as it can generate a negative pressure. For example, a mechanical pump or the like may be employed in addition to the injector that generates a negative pressure by supplying the washing water.

Hereinafter, the first and second embodiments in which the air suction device of the toilet drainage path of the present invention is embodied as a western type flush toilet will be described with reference to the drawings.

(Example 1)

As shown in FIG. 1, the western type flush toilet of the first embodiment has a toilet body 1 and a toilet washing device S. Also, the illustration of the toilet seat and the toilet lid is omitted.

The toilet body 1 has a rim 3 on the inner circumference of the upper portion of the bowl. Further, the toilet body 1 is formed with an upward flow path 2b extending upward from the lower end of the bowl 2, and a water seal portion 4 is formed below the bowl. The ascending flow path 2b of the toilet body 1 is connected to the connecting pipe, and the inside of the connecting pipe is the toilet drainage path 5, the stagnation part 6, and the drain port 7.

Moreover, the toilet washing apparatus S has the washing water supply device 100 and the air suction device 200 of the toilet drain path 5.

The washing water supply device 100 is provided with a water conduit 10 connected to the water pipe, and a first opening and closing valve V1 that can open and close the water conduit 10.

The water conduit 10 is connected to the floor of the toilet in which the toilet body 1 is provided or the water stop plug V5 of the water pipe that is pulled out from the wall surface. Further, on the upstream side of the first opening and closing valve V1, the filter device 11 and the constant flow valve 12 in which the water stop valve and the filter are housed are provided, and the vacuum interrupter 13 is provided on the downstream side.

Further, the water conduit 10 on the downstream side of the vacuum interrupter 13 is connected to the inlet 31 of the injector 30 of the negative pressure generating device. The outlet 32 of the ejector 30 is connected to the inlet 21 of the water tank 20, and the self-flow outlet 22 can flow out the washing water stored in the water tank 20.

The water tank 20 has an inflow chamber 25 that communicates with the inflow port 21; and a bottom portion and an inflow chamber 25 that communicate with each other and that communicate with the outflow chamber 26 of the outflow port 22. The air inlet port 23 is provided in the inflow chamber 25, and the second opening and closing valve V2 is connected thereto. The inflow chamber 25 discharges the washing water from the nozzle 50 that communicates with the outlet 32 of the ejector 30, and has a swirl chamber 29 that can form a swirling flow. At the outflow port 22, it is connected to the delivery tube 40 which extends to the seat edge 3 of the toilet body 1.

The injector 30 has an intake port 33 that communicates to the outside. This suction port 33, The air is drawn by deriving the washing water from the outlet port 32.

The air suction device 200 of the toilet drain path 5 has the following negative pressure accumulating tank 70, suction box 80, and the like.

The intake port 33 of the ejector 30 is connected to the negative pressure accumulating tank 70 capable of accumulating negative pressure by the first pressure guiding tube 110 provided with the check valve 111. Therefore, the air suction device 200 can also use the injector 30 that constitutes the water supply means of the washing water supply device 100.

The check valve 111 is connected to the first pressure guiding pipe 110 of the negative pressure accumulating tank 70, and the third opening and closing valve V3 is provided in the middle to be branched and connected to the external second pressure guiding pipe 120. In addition, the third pressure guiding tube 130 that is connected to the suction box 80 that sucks air from the toilet drain path 5 is connected to the fourth opening and closing valve V4.

The inside of the suction box 80 is partitioned into the first chamber 81 and the second chamber 82 by a diaphragm 83 that is movable in the vertical direction during installation. The first chamber 81 is connected to the third pressure guiding tube 130 and the second chamber 82 is connected to the toilet drainage path 5 by the suction tube 90.

As shown in FIG. 2, the first opening/closing valve V1, the second opening/closing valve V2, the third opening/closing valve V3, and the fourth opening/closing valve V4 are controlled by the control device C to control the opening and closing timing and the opening and closing time. Since the second opening/closing valve V2, the third opening/closing valve V3, and the fourth opening/closing valve V4 are air-closing switching valves, it is not necessary to add too much pressure, and can be miniaturized compared to the water opening and closing valve. The small force can be used to open and close.

In the above-described western flush toilet, the air suction device 200 of the toilet drainage path 5 is provided by the injector 30, the first pressure guiding tube 110, the check valve 111, the negative pressure storage tank 70, and the second pressure guiding device. Tube 120, third on-off valve V3, third The pressure guiding tube 130, the fourth opening and closing valve V4, the suction box 80, the suction tube 90, and the control device C are configured. The washing water supply device is composed of a water conduit 10, a filter device 11, a constant flow valve 12, a first opening and closing valve V1, a vacuum interrupter 13, an ejector 30, a nozzle 50, a water tank 20, and a second opening and closing valve V2. The tube 40, the first pressure guiding tube 110, the second pressure guiding tube 120, the third opening and closing valve V3, and the control device C are configured.

Next, the operation of the toilet washing apparatus S in which the air suction device 200 of the first embodiment is assembled will be described in accordance with the configuration shown in Fig. 1 .

(when not washing) In FIG. 3, the first opening/closing valve V1, the second opening/closing valve V2, the third opening/closing valve V3, and the fourth opening/closing valve V4 are both closed when the cleaning is not performed before the time t1. In this state, the washing water in the water tank 20 is stored. The diaphragm 83 in the suction box 80 abuts against the inner wall surface on the lower side inside the suction box 80.

(The potty wash stroke. Negative pressure accumulator stroke) After the toilet is used, at the time t1 of FIG. 3, the user transmits a start signal of the toilet washing to the control device C by operating the washing switch, and the first opening and closing valve V1 is opened by the control device C.

Thereby, the washing water flowing in the introduction pipe 10 flows into the swirling chamber 29 through the ejector 30. By the flow of the washing water in the ejector 30, the ejector 30 sucks the air in the negative pressure accumulating tank 70 through the first pressure guiding tube 110 and the check valve 111, and the sucked air is washed. The purified water flows into the swirl chamber 29 together. Since the washing water swirls in the swirling chamber 29, the air in the washing water can be well separated and accumulated in the upper portion of the inflow chamber 25. Therefore, the negative pressure in the negative pressure accumulating tank 70 is gradually accumulated, and at the same time, The portion of the air sucked from the negative pressure accumulator tank 70 gradually lowers the water surface of the inflow chamber 25.

In addition, the washing water supplied from the water conduit 10 and the washing water stored in the water tank 20 in accordance with the amount of air sucked from the negative pressure accumulating tank 70 are supplied by the delivery pipe 40. To the seat edge 3. The washing water supplied to the seat edge 3 flows down along the inner surface of the bowl 2, and a swirling flow is formed in the potty 2. By this swirling flow, the dirt is concentrated to the center of the bowl. Further, by this swirling flow, the toilet paper is cracked and mixed with the washing water, and dispersed in the washing water.

(inhalation stroke) At the time t2 of Fig. 3, the fourth opening and closing valve V4 is opened by the control device C. Thereby, the negative pressure in the negative pressure accumulating tank 70 is transmitted to the first chamber 81 of the suction box 80 by the first pressure guiding tube 110, the third pressure guiding tube 130, and the fourth opening and closing valve V4, and The inside of the chamber 81 becomes a negative pressure. Further, since the washing water is continuously supplied to the ejector 30, the ejector 30 can also suck the air in the first chamber 81. Thereby, the diaphragm 83 in the suction box 80 is suddenly pulled up by the negative pressure in the negative pressure accumulating tank 70 at the time of opening the fourth opening and closing valve V4, and thereafter, due to the pumping of the negative pressure accumulating tank 70 Since the suction is completed, it is slowly pulled up only by the ejector 30 against the inner wall surface on the upper side of the suction box 80.

When the air in the toilet drain path 5 is sucked into the second chamber 82 by the suction box 80, the water level in the bowl 2 becomes relatively high due to the washing water supplied to the potty 2 during the pot washing process. The head difference between the uppermost portion 4a and the water seal portion 4 also becomes very large. Therefore, the wash in the potty 2 The clean water is sucked by the air in the toilet drain path 5 by the water of the head water, and the washing water flows into the toilet drain path 5 at a time, and the washing water in the toilet drain path 5 is filled up in advance. The water state has a strong siphon effect. Therefore, it is possible to form an exhaust stream in advance with a small amount of washing water. Further, the full water state in the toilet drainage path 5 in which the siphon action occurs is not limited to the completely full water state of the washing water in the toilet drainage path 5, but is the flow side and the downstream side of the toilet drainage path 5 The state of the drainage flow occurs while maintaining the pressure balance, and it also includes the case where air remains in the toilet drainage path 5.

At this time, the dirt concentrated in the center of the bowl 2 by the swirling flow formed in the bowl 2 is used to reliably drain the toilet water along with the washing water discharged to the toilet drainage path 5 by the siphon action. 5 discharge.

Further, the toilet drainage path 5 is blocked by the accumulation portion 6, and the toilet drainage path 5 becomes a sealed space between the water seal portion 4 and the accumulation portion 6. Therefore, it can surely suck a certain amount of air from the toilet drainage path 5, and siphoning can be stably performed.

Further, since the inside of the suction box 80 is partitioned into the first chamber 81 and the second chamber 82 by the diaphragm 83, since only the second chamber 82 communicates with the toilet drainage path 5, it is possible to reliably prevent the inclusion of dirt. The washing water or the air containing the odor enters the negative pressure accumulating tank 70 or the ejector 30 side.

(washing water increases the itinerary) At the time t3 of Fig. 3, the water level of the potty 2 drops to the vicinity of the height of the lowest position 2a at the rear of the bowl 2, and at this moment, the third opening and closing valve V3 is opened by the control device C, and the fourth opening and closing valve is opened. V4 closed valve.

At this time, since the washing water is still supplied into the ejector 30, a large amount of external air flows into the swirl chamber 29 through the third opening and closing valve V3, the second pressure guiding tube 120, and the first pressure guiding tube 110. Therefore, the washing water flowing into the chamber 25 is pushed out to the seat edge 3 by the large amount of air flowing in and out of the outlet chamber 26 and the delivery pipe 40. As a result, the water level in the inflow chamber 25 is drastically lowered.

Since the toilet bowl 2 allows air to flow into the toilet drainage path 5, before the siphoning action ends, that is, before the water level in the bowl 2 drops to be lower than the lowest position 2a of the rear portion of the bowl, the washing water supplied to the seat edge 3 is Will increase. In other words, since the washing water supplied from the seat edge 3 is the sum of the washing water supplied from the water conduit 10 and the washing water stored in the water tank 20, the washing water per unit time of the potty 2 is The amount of water supplied has also increased. Therefore, the water seal portion 4 is not broken, and the washing water in the potty 2 continues to swirl and continues the siphon action. Moreover, the swirling flow in the bowl 2 also becomes strong. In addition, the water potential of the washing water also increases. Therefore, the dirt remaining in the bowl 2 is discharged toward the toilet drainage path 5, and at the same time, the lighter dirt floating in the washing water floating in the bowl 2 can be drained toward the toilet. Path 5 is discharged.

(exhaust stroke) At the time t4 of Fig. 3, the washing water supplied to the potty 2 is still swirled in the potty 2 by the washing water increase stroke, and the water seal portion 4 is not broken. That is, the discharge flow due to the siphon action continues. At the time t4, the first opening and closing valve V1 is closed by the control device C, and the fourth opening and closing valve V4 is opened. Thereby, the first chamber 81 of the suction box 80 passes through the fourth opening and closing valve V4, the third pressure guiding tube 130, the first pressure guiding tube 110, and the second pressure guiding tube 120. Since the third opening/closing valve V3 is connected to the outside, the inside of the first chamber 81 becomes atmospheric pressure and the diaphragm 83 is lowered. Therefore, air is discharged from the second chamber 82 into the toilet drainage path 5, and the air in the toilet drainage path 5 is increased. In this way, it is impossible to maintain the full water state in the toilet drainage path 5 by the washing water, and the siphoning action is terminated. Further, the state in which the toilet water drain path 5 cannot be maintained in the full water state by the washing water also includes the state in which the air remains in the toilet drain path 5, and the pressure balance between the flow side and the downstream side of the toilet drain path 5 is maintained. It is still unable to maintain the state of the drainage flow. In this case, the water seal portion 4 is not broken so that the seal sound does not occur.

(watering trip) At the time t5 of FIG. 3, the first opening and closing valve V1 and the second opening and closing valve V2 are opened by the control device C, and the fourth opening and closing valve V4 is closed. Thereby, the ejector 30 sucks the air from the outside while the washing water flows into the swirl chamber 29. The air in the washing water is well separated in the swirling chamber 29, and is released to the outside through the air port 23 and the second opening and closing valve V2. Therefore, the washing water in the water tank 20 is accumulated to a predetermined water level before the start of washing. Further, the siphon action is completely completed, and the washing water is supplied from the outflow chamber 26 to the seat edge 3 through the delivery pipe 40, and a water seal portion having a predetermined water level is formed in the potty pot to cover the water.

(Atmospheric open journey) At the time t6 of Fig. 3, the first opening and closing valve V1 is closed by the control device C, and the fourth opening and closing valve V4 is opened. As a result, the first chamber 81 of the suction box 80 is again communicated to the outside through the fourth opening and closing valve V4, the third pressure guiding tube 130, the first pressure guiding tube 110, the second pressure guiding tube 120, and the third opening and closing valve V3. , The diaphragm 83 is lowered to abut against the inner wall surface on the lower side of the suction box 80. As a result, the diaphragm 83 returns to the predetermined position before the washing, and the next washing can be performed stably. Thereafter, at time t7 in FIG. 3, the second opening/closing valve V2, the third opening/closing valve V3, and the fourth opening/closing valve V4 are closed by the control device C.

Therefore, in the air suction device 200 of the toilet drainage path 5 of the first embodiment, the toilet can be cleaned well and quietly.

(Example 2)

The western flush toilet of the second embodiment has the same configuration as that of the first embodiment. As shown in Fig. 4, the operation of the toilet flushing device S differs from the operation of the western flush toilet of the first embodiment.

The difference in the operation of the toilet washing device S will be explained.

As shown in Fig. 4, the first opening and closing valve V1 is closed by the control device C, and the fourth opening/closing valve V4 is opened by the control device C from the point t4 after the predetermined time elapses from the end of the washing water increase stroke. Thereby, the first chamber 81 of the suction box 80 is connected to the fourth opening and closing valve V4, the third pressure guiding tube 130, the first pressure guiding tube 110, the second pressure guiding tube 120, and the third opening and closing valve V3. Externally, therefore, the first chamber 81 becomes atmospheric pressure, and the diaphragm 83 descends. At the point t4 after the end of the washing water increase stroke and the lapse of the predetermined time, the washing water supplied to the potty 2 is also discharged by the siphon action to the toilet drain path 5 by the washing water increase stroke, and the toilet bowl 2 is discharged. The amount of washing water is reduced. Therefore, when the air from the second chamber 82 is pressed into the toilet drainage path 5, the discharge flow formed by the siphon action is interrupted immediately, and it can immediately and surely cause the siphon action to end. Further, in this case, since the water seal portion 4 is not broken, the seal sound does not occur. Other actions are the same as in the first embodiment. The detailed description is omitted.

Thus, the air suction device 200 of the toilet drainage path 5 of the second embodiment is also the same as that of the first embodiment, and the effects and effects of the present invention can be attained.

The present invention has been described above with reference to the first and second embodiments, but the present invention is not limited to the embodiments 1 and 2, and the present invention is not limited thereto, and may be appropriately modified without departing from the scope of the invention.

(industrial availability)

The invention can be utilized in a flush toilet.

1‧‧‧ Toilet body

2‧‧‧ potty

2a‧‧‧Minimum Department

2b‧‧‧Upstream flow path

3‧‧‧Fang

4‧‧‧Water Seal Department

4a‧‧‧The highest position

5‧‧‧ Toilet drainage path

6‧‧‧Detention Department

7‧‧‧Drainage

10‧‧‧Water conduit

11‧‧‧Filter device

12‧‧‧ fixed flow valve

13‧‧‧vacuum interrupter

20‧‧‧Sink

21‧‧‧Inlet

22‧‧‧Exit

23‧‧‧ atmosphere

25‧‧‧Inflow room

26‧‧‧Outflow room

29‧‧‧Swing room

30‧‧‧Injector (negative pressure generating device)

31‧‧‧Import

32‧‧‧Export

33‧‧‧ Intake port

40‧‧‧Send tube

50‧‧‧ nozzle

70‧‧‧Negative pressure storage tank

80‧‧‧ suction box

81‧‧‧Room 1

82‧‧‧Room 2

83‧‧‧Separator

90‧‧‧Sucking tube

100‧‧‧Washing water supply device

110‧‧‧1st pressure guiding tube

111‧‧‧ check valve

120‧‧‧2nd pressure guiding tube

130‧‧‧3rd pressure guiding tube

200‧‧‧ suction device

C‧‧‧Control device

S‧‧‧ toilet cleaning device

V1‧‧‧1st on-off valve

V2‧‧‧2nd opening and closing valve

V3‧‧‧3rd opening and closing valve

V4‧‧‧4th on-off valve

V5‧‧‧ water stop

Fig. 1 is a schematic view showing a western type flush toilet having the suction device of the toilet drainage path of the first and second embodiments.

Fig. 2 is a view showing the control device of the toilet washing device of the first and second embodiments.

Fig. 3 is a timing chart for explaining the operation of the western type flush toilet of the first embodiment.

Fig. 4 is a timing chart for explaining the operation of the western type flush toilet of the second embodiment.

1‧‧‧ Toilet body

2‧‧‧ potty

2a‧‧‧Minimum Department

2b‧‧‧Upstream flow path

3‧‧‧Fang

4‧‧‧Water Seal Department

4a‧‧‧The highest position

5‧‧‧ Toilet drainage path

6‧‧‧Detention Department

7‧‧‧Drainage

10‧‧‧Water conduit

11‧‧‧Filter device

12‧‧‧ fixed flow valve

13‧‧‧vacuum interrupter

20‧‧‧Sink

21‧‧‧Inlet

22‧‧‧Exit

23‧‧‧ atmosphere

25‧‧‧Inflow room

26‧‧‧Outflow room

29‧‧‧Swing room

30‧‧‧Injector (negative pressure generating device)

31‧‧‧Import

32‧‧‧Export

33‧‧‧ Intake port

40‧‧‧Send tube

50‧‧‧ nozzle

70‧‧‧Negative pressure storage tank

80‧‧‧ suction box

81‧‧‧Room 1

82‧‧‧Room 2

83‧‧‧Separator

90‧‧‧Sucking tube

100‧‧‧Washing water supply device

110‧‧‧1st pressure guiding tube

111‧‧‧ check valve

120‧‧‧2nd pressure guiding tube

130‧‧‧3rd pressure guiding tube

200‧‧‧ suction device

S‧‧‧ toilet cleaning device

V1‧‧‧1st on-off valve

V2‧‧‧2nd opening and closing valve

V3‧‧‧3rd opening and closing valve

V4‧‧‧4th on-off valve

V5‧‧‧ water stop

Claims (4)

An air suction device for a toilet drainage path, which is a suction means for sucking air from a toilet drainage path connected to a flow side of a water seal portion of the toilet body, wherein the suction device of the toilet drainage path is The suction means has: a negative pressure generating device; and a suction box connected between the negative pressure generating device and the toilet drainage path; and further comprising: a control device that can control the suction box Performing an air suction stroke from the toilet drainage path, and performing an exhaust stroke for discharging the air to the toilet drainage path; the control device is implemented after the supply of the washing water to the toilet bowl of the toilet body is started The intake stroke is performed before the supply of the washing water to the potty is completed. An air suction device for a toilet drainage path according to the first aspect of the invention, wherein the control device supplies the washing water to the bowl, and performs the exhaust stroke between the toilet drainage path and the continuous discharge flow by siphoning. . The air suction device of the toilet drainage channel according to the first aspect of the invention, wherein the control device restarts the washing water after temporarily stopping the supply of the washing water to the potty, and forming a water seal portion in the potty The aforementioned exhaust stroke is performed before supply. The air suction device of the toilet drainage path according to any one of claims 1 to 3, wherein the inside of the suction box is partitioned into the first chamber and the first portion by a diaphragm that is movable in the vertical direction during installation. 2 rooms, The first chamber is connected to the aforementioned negative pressure generating device, and the second chamber is connected to the aforementioned toilet drainage path.