JP5117261B2 - Flush toilet - Google Patents

Description

  The present invention relates to a flush toilet bowl.

  Patent Document 1 discloses a conventional flush toilet. This flush toilet bowl includes a toilet bowl body having a toilet bowl and a toilet drainage channel that communicates with the downstream side of the toilet bowl and forms a sealed portion together with the toilet bowl. Further, the flush toilet bowl is provided with a washing water supply device. This cleaning water supply device supplies cleaning water to a rim provided at the periphery of the upper opening of the toilet bowl, and then supplies cleaning water to a jet opening provided at the lower end of the toilet bowl and opening toward the toilet drainage channel To do. When the washing water is ejected from the jet port, a siphon action is generated in the toilet drainage channel, and the washing water in the sealing portion is discharged downstream of the toilet drainage channel. When the supply of the cleaning water to the jet port by the cleaning water supply device is finished, the siphon action is finished. Thereafter, by reducing the amount of cleaning water supplied to the rim by the cleaning water supply device, the surface of the cleaning water in the toilet bowl can be made lower than the normal standby water level.

  In the conventional flush toilet having such a configuration, the inner surface of the toilet bowl can be cleaned by making the surface of the wash water in the toilet bowl lower than the normal standby surface. For this reason, the toilet bowl surface near the water surface at the time of normal standby can be easily cleaned with a brush or the like, and the scale can be removed well. Moreover, the water splash which arises when cleaning a toilet bowl surface with a brush etc. can be decreased.

  In addition, this flush toilet bowl reduces the splashing of flushing water in the toilet bowl by lowering the flushing water level in the toilet bowl compared to the normal standby level when performing urination and men's urination. be able to.

JP-A-11-350578

  However, in the conventional flush toilet, in order to lower the surface of the wash water in the toilet bowl, the wash water must be ejected from the jet port, which lacks water saving and quietness.

  This invention is made | formed in view of the said conventional situation, Comprising: It is set as the problem which should be solved to provide the flush toilet bowl which can reduce the water surface of the wash water in a toilet bowl favorably.

The flush toilet of the present invention communicates with the toilet bowl, the toilet drain downstream of the toilet bowl, and forms a sealed water portion with the toilet bowl, and the downstream of the toilet drain path. A toilet body having a staying part in which
A washing water supply device for supplying washing water to the toilet bowl;
An intake / exhaust device for sucking air from the toilet drainage channel and discharging air to the toilet drainage channel;
In the flush toilet equipped with the washing water supply device and a control device for controlling the intake / exhaust device,
In the toilet drainage channel, a closed space is formed by the washing water of the sealed water part and the washing water of the staying part,
The control device has a toilet bowl water surface lowering mode in which the cleaning water supply device does not supply cleaning water to the toilet bowl when the intake / exhaust device sucks air in the closed space from the toilet drainage channel. It is characterized by being.

  In this flush toilet, when the toilet bowl water level lowering mode is executed, the air in the closed space is sucked from the toilet drainage channel by the intake / exhaust device without supplying the wash water to the toilet bowl by the wash water supply device. The negative pressure causes the washing water in the sealed portion to flow out to the staying portion. Thereby, the surface of the washing water in the toilet bowl can be lowered. Thus, when lowering the surface of the wash water in the toilet bowl, the wash water supply device does not supply the wash water to the toilet bowl, and the intake / exhaust device sucks the air in the closed space from the toilet drainage channel. This flush toilet bowl is excellent in water saving and quietness because it hardly generates sound.

  Therefore, the flush toilet of the present invention can satisfactorily lower the water level of the wash water in the toilet bowl.

  The staying part can be sealed with washing water that stays even after the toilet bowl water level lowering mode is executed. In this case, the odor is prevented from flowing backward from the downstream side to the upstream side of the staying portion. For this reason, when cleaning the inner surface of the toilet bowl by lowering the water level of the cleaning water in the toilet bowl, the cleaning water in the sealing part is pushed out to the staying part side, and the water seal in the sealing part is broken. However, it is possible to prevent the odor from flowing backward from the downstream side of the staying part into the toilet room where the flush toilet is installed.

  In the toilet bowl water level lowering mode, air can be discharged to the toilet drainage channel after the intake / exhaust device sucks air in the closed space from the toilet drainage channel. In this case, air is sucked from the toilet drainage channel by the intake / exhaust device, and the washing water remaining on the upstream side of the toilet drainage channel is pushed back to the toilet bowl side after the flushing water in the sealed water portion flows out to the retention portion side. For this reason, the washing water in the sealed water portion is hardly pushed out toward the staying portion, and the sealed water in the sealed water portion is difficult to break. For this reason, it is possible to prevent the odor from flowing back into the toilet room from the downstream side of the sealing portion.

  After the water level in the toilet bowl is lowered by the execution of the toilet bowl water level lowering mode, the control device is supplied with washing water to the toilet bowl by the washing water supply device, and the water level in the toilet bowl rises to the raised position, The intake / exhaust device is operated to suck the air in the closed space from the toilet drainage channel, and then the supply of cleaning water to the toilet bowl of the cleaning water supply device is stopped, and the intake / exhaust device exhausts air to the toilet drainage channel It may have a toilet bowl water surface return mode. In this case, after the toilet bowl water level lowering mode is executed, the flush water level in the toilet bowl is raised to the same ascending position as in normal toilet flushing to generate a siphon action, and the toilet bowl is washed in the same manner as in normal toilet flushing. Cover the pot with water. For this reason, since it is possible to reliably return the amount of washing water in the sealed water part and the staying part and the amount of air in the closed space to the same state as during normal standby, it is possible to perform subsequent toilet flushing well. it can.

  In the toilet bowl water level lowering mode, the washing water supply device is operated before the intake / exhaust device sucks the air in the closed space from the toilet drainage channel, and a set amount of washing water can be supplied to the toilet bowl. In this case, even if the washing water in the staying portion is reduced for some reason or the water seal is cut off, the washing water is supplied to the staying portion at the initial stage of execution of the toilet bowl water level lowering mode, so that the staying portion Is securely sealed. For this reason, a closed space can be formed reliably. Therefore, when the intake / exhaust device sucks air from the toilet drainage channel, negative pressure is generated, and the water level of the wash water in the toilet bowl can be reliably lowered. Moreover, even if the staying part is formed so that air can be circulated during standby, the staying part can be sealed with water by supplying cleaning water to the staying part at the initial stage of the execution of the toilet bowl water level lowering mode. Thereby, a closed space can be formed. For this reason, when the intake / exhaust device sucks air in the closed space from the toilet drainage channel, a negative pressure is generated, and the water level of the wash water in the toilet bowl can be reliably lowered.

  Examples 1 and 2 embodying the flush toilet of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the flush toilet according to the first embodiment includes a toilet body 1, a flush water supply device 10, an intake / exhaust device 20, and a control device 30.

  The toilet body 1 includes a toilet bowl 2, a toilet drainage channel 5, and a staying portion R. A rim 3 is provided on the upper peripheral edge of the toilet bowl 2. An outlet 4 that opens on a horizontal plane is provided at the lower end of the toilet bowl 2. A toilet drainage channel 5 communicates with the outlet 4. The toilet drainage channel 5 includes an ascending channel 6 and a descending channel 7. The ascending flow path 6 and the toilet bowl 2 form a sealed water portion H in which washing water stays.

  The descending flow path 7 is formed by a toilet drain pipe 40 communicating with an opening provided at the rising end of the ascending path 6. The opening at the downstream end of the toilet drain pipe 40 communicates with a drain pipe connection port drawn out to a floor surface (not shown) via a drain connector 50. The toilet drain pipe 40 is provided with a communication pipe 41 for connecting the intake / exhaust device 20 to the upper surface.

  The drainage connector 50 includes a housing 51 and an internal pipe 52 disposed in the housing 51. The casing 51 includes an inlet 51U provided on the upper surface and connected to the downstream end of the toilet drain pipe 40 via the packing P, and an outlet 51D provided on the lower surface and connected to the drain pipe. ing. The internal pipe 52 includes a descending channel 52A that is continuous with the inflow port 51U, and an ascending channel 52B that is continuous with the downstream end of the descending channel 52A and has a downstream port 52C that opens into the housing 51. . The internal pipe 52 is formed of a descending channel 52A and an ascending channel 52B, and has a staying portion R in which the washing water stays. The stay part R is completely sealed with the staying wash water. As a result, a closed space is formed in the toilet drainage channel 5 and the internal pipe 52 between the downstream side of the sealing portion H formed in the toilet body 1 and the upstream side of the retention portion R. Further, the odor is prevented from flowing backward from the downstream side of the staying portion R to the upstream side. For this reason, even when the water seal of the sealing part H is broken when the inner surface of the toilet bowl 2 is cleaned, the odor flows backward from the downstream side of the retention part R into the toilet room where the flush toilet is installed. This can be prevented.

  The washing water supply device 10 is communicated with a water pipe (not shown). Further, in the cleaning water supply device 10, a strainer device, a constant flow valve, an on-off valve, and a vacuum breaker (not shown) are sequentially arranged from the upstream side. A nozzle 11 is connected to the downstream side of the cleaning water supply device 10. The downstream end of the nozzle 11 communicates with the rim 3. Wash water discharged from the tip of the nozzle 11 flows into the stool 2 while turning the rim 3 and generates a swirl flow in the stool 2. The on-off valve employs a valve that gradually increases and decreases the water discharge flow rate when the valve is opened and closed, so that the water hammer phenomenon does not occur due to sudden opening and closing of the valve.

  The intake / exhaust device 20 includes an intake / exhaust tank 21 and a drive device 22. The intake / exhaust tank 21 is provided with a diaphragm 21 </ b> D that is movable in a vertical direction in a pan-shaped housing 21 </ b> H. An intake / exhaust pipe 21P is provided on the lower surface of the housing 21H. The intake / exhaust pipe 21 </ b> P is inserted and connected to the communication pipe 41 of the toilet drain pipe 40. The driving device 22 is a rod-like body having a cylindrical case body 22H that is long in the vertical direction, a diaphragm 22D that can move in the vertical direction in the case body 22H, and a disk-shaped push-up plate 22A that can push up the diaphragm 22D from below. 22B and a motor 22M that moves the push-up plate 22A up and down. The upper upper space 24 defined by the diaphragm 21D of the intake / exhaust tank 21 and the lower lower space 25 defined by the diaphragm 22D of the driving device 22 are connected by a connecting pipe 23.

  In the intake / exhaust device 20, the motor 22M rotates and the rod-like body 22B extends upward, whereby the push-up plate 22A is pushed upward, and the diaphragm 22D of the drive device 22 moves to the raised position. As a result, the air in the upper space 24 of the intake / exhaust tank 21 is sucked into the lower space 25 of the drive unit, and the diaphragm 21D of the intake / exhaust tank 21 moves to the raised position. In this way, the intake / exhaust tank 21 sucks air in the closed space from the toilet drainage channel 5. Further, when the motor 22M rotates and the rod-like body 22B contracts downward, the push-up plate 22A descends, and the diaphragm 22D of the driving device 22 moves to the lowered position. Thereby, the air in the lower space 25 of the drive device 22 is pushed into the upper space 24 of the intake / exhaust tank 21, and the diaphragm 21D of the intake / exhaust tank 21 moves to the lowered position. In this way, the intake / exhaust tank 21 discharges air to the toilet drainage channel 5. Further, unless the diaphragm 22D of the driving device 22 is lowered, the diaphragm 21D of the intake / exhaust tank 21 is maintained at the raised position.

  The control device 30 controls the cleaning water supply device 10 and the intake / exhaust device 20 by a signal from a remote controller (not shown). That is, the control device 30 can control the opening / closing of the opening / closing valve constituting the cleaning water supply device 10 and the rotation of the motor 22M incorporated in the drive device 22 of the intake / exhaust device 20. The control device 30 has a storage device, and can store and execute a plurality of control modes of the cleaning water supply device 10 and the intake / exhaust device 20.

  In the flush toilet of the present invention having the above-described configuration, the toilet bowl in which the water level in the toilet bowl 2 is lowered and the water level in the toilet bowl 2 is returned to the normal standby water level. Execution of the water surface return mode will be described.

[Standby (Fig. 1)]
As shown in FIG. 1, the washing water stays in the sealing part H of the toilet body 1 up to the height of the opening lower part 6 </ b> A at the rising end of the rising channel 6. For this reason, the water surface L in the toilet bowl 2 is located at the standby position at the height of the opening lower portion 6 </ b> A at the rising end of the rising flow path 6. Further, the staying portion R of the internal pipe 52 of the drainage connector 50 is completely sealed with the staying wash water. For this reason, a closed space is formed in the toilet drainage channel 5 and the internal pipe 52 between the downstream side of the sealed water portion H and the upstream side of the staying portion R. Moreover, the sealing part H and the stay part R prevent the odor downstream from the stay part R from flowing back into the toilet room in which the flush toilet is installed. The diaphragm 21D of the intake / exhaust tank 21 and the diaphragm 22D of the driving device 22 are disposed at the lowered position.

[Drainage process (Figure 2)]
When a toilet bowl water level lowering button provided on a remote controller (not shown) is operated, the control device 30 executes a toilet bowl water level lowering mode. When the toilet bowl water level lowering mode is executed, the motor 22M of the driving device 22 rotates between the time A and the time B in FIG. 9 to push the push-up plate 22A upward, as shown in FIG. 22D is moved to the raised position. Thereby, the diaphragm 21 </ b> D of the intake / exhaust tank 21 is also moved to the raised position, and the air in the closed space is sucked from the toilet drainage channel 5. The washing water in the sealed water portion H flows out to the staying portion R due to the negative pressure generated at this time. For this reason, the water surface L of the wash water in the toilet bowl 2 descends toward the outlet 4.

  Even after the diaphragm 21 </ b> D of the intake / exhaust tank 21 moves to the ascending position, the cleaning water in the sealed water portion H flows out to the staying portion R side from time B to time C in FIG. 9. At this time, as the water level L of the wash water in the toilet bowl 2 becomes lower, the downstream water level gradually increases from the upstream side of the sealed water portion H, so that the ascending flow path 6 flows into the wash water of the sealed water portion H. The action of returning from the inside toward the toilet bowl 2 is gradually strengthened. For this reason, the flow rate of the washing water flowing out from the sealed water portion H to the staying portion R side gradually decreases. On the other hand, as the flow rate of the washing water flowing into the staying portion R decreases, the water level on the upstream side of the staying portion R that has risen from the standby time gradually decreases. As a result, the difference in water level between the upstream side and the downstream side of the retention portion R is gradually reduced, so that the action of trying to flow from the upstream side to the downstream side is gradually weakened in the wash water of the retention portion R. For this reason, since the force to draw the cleaning water in the sealed water portion H into the staying portion R is also weakened, the amount of cleaning water flowing out from the sealing water portion H to the staying portion R side is further reduced.

[Stable process (Fig. 3)]
At the time point C in FIG. 9, as shown in FIG. When the washing water in the staying part R caused by the difference in the water level between the upstream side and the downstream side of the part R is balanced with the action of flowing out to the downstream side, the washing water in the sealed water part H is retained in the staying part R. The water surface in the toilet bowl 2 stops at a position lower than the outlet 4. The stay part R is affected by pressure fluctuations in the drain pipe communicating with the outlet 51D of the drain connector 50. Since the balance with the sealed water portion H may be lost if the staying portion R is affected by the pressure fluctuation on the downstream side, the diaphragm 21D of the intake / exhaust tank 21 is maintained at the elevated position from time C to time D in FIG. And the washing water in the sealed water portion H is stabilized.

[Dropped water surface forming step (FIG. 4)]
As shown in FIG. 4, the motor 22M of the driving device 22 rotates between the time point D and time E in FIG. 9, lowers the push-up plate 22A downward, and moves the diaphragm 22D to the lowered position. At this time, the time required to move the diaphragm 22D from the raised position to the lowered position is set longer than when the diaphragm 22D is moved from the lowered position to the raised position at the initial stage of execution of the toilet bowl water level lowering mode. Thereby, the diaphragm 21 </ b> D of the intake / exhaust tank 21 is also moved to the lowered position, and air is discharged to the toilet drainage channel 5. Then, the wash water in the ascending flow path 6 is pushed back to the toilet bowl 2 side, and the water level L in the toilet bowl 2 becomes slightly higher than the outlet 4. Further, the level of the washing water in the ascending flow path 6 is lower than the opening lower part 6 </ b> A at the rising end of the ascending flow path 6. For this reason, since the washing water of the sealed water part H becomes difficult to be pushed out to the retention part R side, the water seal of the sealed water part H becomes difficult to break. Therefore, when cleaning the inner surface of the toilet bowl 2, the possibility that odors may flow backward from the downstream side of the sealing part H into the toilet room where the flush toilet is installed can be reduced. On the other hand, the water level on the upstream side of the staying portion R decreases and returns to the same water level as in the standby state.

  As described above, in the flush toilet according to the first embodiment, when the toilet bowl water level lowering mode is executed, the flush water supply device 10 does not supply the flush water to the toilet bowl 2 and the intake / exhaust device 20 performs the toilet bowl. Air in the closed space is sucked from the drainage channel 5, and the washing water of the sealed water portion H flows out to the staying portion R side by the negative pressure. Thereby, the surface of the washing water in the toilet bowl 2 can be lowered. At this time, the flush water supply device 10 does not supply flush water to the toilet bowl 2, and the intake / exhaust device 20 hardly generates the sound of sucking the air in the closed space from the toilet drainage channel 5. Is excellent in water saving and quietness.

  Therefore, the flush toilet of Example 1 can satisfactorily reduce the water level of the wash water in the toilet bowl 2.

  After the water level in the toilet bowl 2 is lowered by the execution of the toilet bowl water level lowering mode, when the washing button provided on the remote control is operated, the control device 30 waits for the water surface in the toilet bowl 2. The toilet bowl water surface return mode that is the same as the time is executed so that the toilet bowl can be washed well thereafter.

[Toilet bowl wash water increase process (Figure 5)]
In the toilet bowl water surface return mode, the opening / closing valve of the cleaning water supply device 10 is opened between the time V and the time W in FIG. 10, and the cleaning water is supplied into the toilet bowl 2 from the nozzle 11 via the rim 3. To do. The supply flow rate of the wash water to the toilet bowl 2 becomes a constant flow rate several seconds after the opening / closing valve of the wash water supply device 10 is opened. This constant flow rate is the wash water drained from the drainage connector 50 via the toilet drainage channel 5 when the water surface L in the toilet bowl 2 descends to the vicinity of the outlet 4 after the siphon action described later occurs. The flow rate is set to be approximately equal to the drainage flow rate. When cleaning water is supplied from the cleaning water supply device 10 to the toilet bowl 2, the water level L of the cleaning water in the toilet bowl 2 gradually rises to the rising position as shown in FIG. Since this ascending position exceeds the opening lower part 6A at the ascending end of the ascending flow path 6, the washing water overflows from the sealed water part H to the staying part R. For this reason, the water level upstream of the retention part R rises, and the retention part R is reliably sealed with water. In this step, the diaphragm 21D of the intake / exhaust tank 21 and the diaphragm 22D of the driving device 22 are disposed at the lowered position.

[Siphon generation process (Fig. 6)]
At the time point W in FIG. 10, the water level L of the wash water in the toilet bowl 2 rises to the ascending position, and as shown in FIG. 6, the motor 22M of the driving device 22 rotates to push up the push-up plate 22A upward. 22D is moved to the raised position. Thereby, the diaphragm 21 </ b> D of the intake / exhaust tank 21 is also moved to the raised position, and the air in the closed space is sucked from the toilet drainage channel 5. Due to the synergistic effect of the negative pressure generated at this time and the potential energy of the wash water in the toilet bowl 2, the wash water in the toilet bowl 2 flows into the toilet drainage channel 5 vigorously while swirling, and has a powerful siphon action. Will occur. As shown in FIG. 10, the water level of the wash water in the toilet bowl 2 suddenly falls to the vicinity of the outlet 4 between the time point W and the time point X.

  Since the siphon action also uses the potential energy of the wash water in the toilet bowl 2, the point in time when the siphon action occurs is the strongest and becomes weaker as the water level L of the wash water in the toilet bowl 2 falls. For this reason, the wash water drained from the drainage connector 50 via the toilet drainage channel 5 also decreases as the water surface L descends. As described above, the flow rate of the wash water supplied from the wash water supply device 10 to the toilet bowl 2 is substantially equal to the drainage flow rate when the water level L of the wash water in the toilet bowl 2 descends to the vicinity of the inflow port 4. Since the flow rate is set, at the time point X, the supply flow rate and the discharge flow rate of the wash water to the toilet bowl 2 are balanced.

[Siphon maintenance process (Fig. 7)]
From the time X to the time Y in FIG. 10, the diaphragm 21D of the intake / exhaust tank 21 is maintained at the raised position. Moreover, the wash water supplied to the toilet bowl 2 from the wash water supply apparatus 10 is maintained at a constant flow rate for a set time from the point X. As a result, as shown in FIG. 7, the water level difference between the water level A of the flush water L in the toilet bowl 2 and the water level B near the downstream end of the toilet drainage channel 5 is maintained in the sealed water portion H. Further, in the water reservoir R, the water level difference between the water level B near the downstream end of the toilet drainage channel 5 and the water level C at the downstream port 52C of the internal pipe 52 is maintained. For this reason, the siphon action is maintained while the water level L of the washing water in the toilet bowl 2 is maintained in the vicinity of the inflow port 4. After a set time has elapsed since time X, the opening / closing valve of the cleaning water supply device 10 is closed, and the flow rate of the cleaning water supplied to the toilet bowl 2 gradually decreases.

[Water-covering process (Fig. 8)]
From the time Y to the time Z in FIG. 10, the motor 22M of the driving device 22 rotates to lower the push-up plate 22A downward and move the diaphragm 22D to the lowered position. The time required to move the diaphragm 22D from the raised position to the lowered position is set to be longer than the time required to move the diaphragm 22D from the lowered position to the raised position in the siphon generation process. Thereby, the diaphragm 21 </ b> D of the intake / exhaust tank 21 is also moved to the lowered position, and air is discharged to the toilet drainage channel 5. When air begins to be discharged into the toilet drainage channel 5 at the time Y, the siphon action is immediately terminated due to the influence. At this time, since the air does not enter the toilet drainage channel 5 from the outlet 4, no breaking sound is generated at the end of the siphon action. Thereafter, the wash water supplied from the wash water supply device 10 returns the water level L of the wash water in the toilet bowl 2 to the standby position, and the water covering is completed.

  As described above, in the flush toilet of the first embodiment, when the toilet bowl water level return mode is executed by the control device 30, the flush water level in the toilet bowl 2 is raised to the raised position in the same manner as normal toilet flushing. Raise the siphon action to raise the toilet bowl 2 and then cover it. For this reason, since the amount of washing water in the sealed water portion H and the staying portion R, the amount of air in the closed space, and the like can be returned to the same state as during normal standby, subsequent toilet flushing can be performed satisfactorily. it can.

  The flush toilet of Example 2 has the same configuration as that of Example 1, and the operation of the flush water supply device 10 in the toilet bowl water level lowering mode is only different from the flush toilet of Example 1. Further, the toilet bowl water surface return mode is the same as that of the flush toilet of the first embodiment. In the flush toilet of Example 2, the difference in operation of the flush water supply device 10 in the toilet bowl water level lowering mode will be described.

  In the flush toilet of Example 2, the washing water supply device 10 supplies a set amount of washing water to the toilet bowl 2 before the draining step shown in FIG. After the drainage step, the washing water supply device 10 does not supply washing water to the toilet bowl 2 as in the flush toilet bowl of the first embodiment. If it does in this way, washing water will flow out to seal part R from sealed water part H before a drainage process. For this reason, even if the washing water of the retention part R has decreased for some reason or the water seal has been cut off, the retention part R is reliably sealed with water. Therefore, when the closed space is reliably formed and the intake / exhaust device 20 sucks the air in the closed space from the toilet drainage channel 5, negative pressure is generated, and the water level of the wash water in the toilet bowl 2 can be reliably lowered. The amount of washing water supplied to the toilet bowl 2 by the washing water supply device 10 before the draining process may be small enough to seal the washing water in the staying portion R, and almost no running sound is generated at that time. Therefore, it is excellent in water saving and quietness.

  Therefore, the flush toilet of Example 2 can also satisfactorily reduce the water level of the wash water in the toilet bowl 2.

  In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be applied with appropriate modifications without departing from the spirit of the present invention. Needless to say.

For example, the toilet bowl body 1 may be one in which the toilet bowl 2, the toilet drainage channel 5, and the staying portion R are integrally formed.
The intake / exhaust device 20 may move the diaphragm 21 </ b> D of the suction tank 21 up and down by electric drive to suck air from the toilet drainage channel 5 and discharge air to the toilet drainage channel 5.
Further, a clearance that can be sealed with water by supplying cleaning water may be formed above the cleaning water in the staying portion so that air flows.
Moreover, you may enable it to change the raise height of the diaphragm 21D of the suction tank 21 in the toilet bowl water surface fall mode. In this case, the width | variety which the water surface L of the wash water in the toilet bowl 2 falls can be changed.

It is a schematic diagram which shows the time of standby of the flush toilet bowl of Examples 1 and 2. It is a schematic diagram which shows the drainage process in the toilet bowl water surface fall mode of Examples 1 and 2. It is a schematic diagram which shows the stable process in the toilet bowl water surface fall mode of Examples 1 and 2. It is a schematic diagram which shows the fall water surface formation process in the toilet bowl water surface fall mode of Example 1 and 2. It is a schematic diagram which shows the wash water increase process in the toilet bowl in the toilet bowl water surface return mode of Examples 1 and 2. It is a schematic diagram which shows the siphon generation | occurrence | production process in the toilet bowl water surface return mode of Example 1 and 2. It is a schematic diagram which shows the siphon maintenance process in the toilet bowl water surface return mode of Examples 1 and 2. It is a schematic diagram which shows the water covering process in the toilet bowl water surface return mode of Examples 1 and 2. 3 is a timing chart illustrating a toilet bowl water level lowering mode according to the first embodiment. 3 is a timing chart showing a toilet bowl water surface return mode of Examples 1 and 2;

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Toilet body 2 ... Toilet bowl 5 ... Toilet drain channel 10 ... Washing water supply device 20 ... Intake / exhaust device 30 ... Control device H ... Sealing part R ... Retention part

Claims (5)

It has a toilet bowl, a toilet drainage channel that communicates with the downstream side of the toilet bowl, and forms a sealed water portion with the toilet bowl, and a retention portion that communicates with the downstream side of the toilet drainage channel and in which the wash water stays The toilet body,
A washing water supply device for supplying washing water to the toilet bowl;
An intake / exhaust device for sucking air from the toilet drainage channel and discharging air to the toilet drainage channel;
In the flush toilet equipped with the washing water supply device and a control device for controlling the intake / exhaust device,
In the toilet drainage channel, a closed space is formed by the washing water of the sealed water part and the washing water of the staying part,
The control device has a toilet bowl water surface lowering mode in which the cleaning water supply device does not supply cleaning water to the toilet bowl when the intake / exhaust device sucks air in the closed space from the toilet drainage channel. A flush toilet.   The flush toilet according to claim 1, wherein the stay portion is sealed with wash water that stays after the toilet bowl water level lowering mode is executed.   The flush toilet according to claim 1 or 2, wherein the toilet bowl water level lowering mode discharges air to the toilet drainage channel after the intake / exhaust device sucks air in the closed space from the toilet drainage channel.   After the water level in the stool is lowered by execution of the water level lowering mode in the stool, the control device is configured to supply cleaning water to the stool by the cleaning water supply device and to raise the water level in the stool. After rising to the position, the intake and exhaust device is operated to suck the air in the closed space from the toilet drainage channel, and then the supply of the wash water to the toilet bowl of the wash water supply device is stopped, The flush toilet according to any one of claims 1 to 3, wherein the intake / exhaust device has a toilet bowl water surface return mode for discharging air to the toilet drainage channel.   In the toilet bowl water level lowering mode, the washing water supply device is operated before the intake / exhaust device sucks air in the closed space from the toilet drainage channel, and a set amount of washing water is supplied to the toilet bowl. The flush toilet bowl according to any one of claims 1 to 4.

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