JP6821144B2 - Flush toilet - Google Patents

Description

The present invention relates to a flush toilet that discharges excrement from a bowl from a trap together with accumulated water by using wash water supplied from a water supply means.

Conventionally, flush toilets have a problem of overflow of washing water due to clogging, and as a countermeasure, when there is a risk of overflow by detecting a change in the water level of accumulated water in order to detect the occurrence of clogging. Has been proposed to prohibit cleaning (see, for example, Patent Document 1 and Patent Document 2).
In such a case, although it is possible to detect that the flush toilet and the drain pipe to which the drain port of the flush toilet is connected are clogged and the accumulated water overflows, prediction of clogging, especially invisible drainage, can be detected. It was not possible to predict in advance that the drainage pipe would be clogged and uncleanable due to the condition of stagnation in the pipe.

In addition, in order to prevent clogging of the drain pipe connected to the drain port of the flush toilet, the usage status of the flush toilet is memorized, and based on the stored value, the drain pipe is cleaned to protect the equipment. (See, for example, Patent Document 3).
However, equipment protection cleaning is performed depending on the usage condition of the flush toilet such as the number of times it is used, and the situation peculiar to the site such as the specifications of the drainage pipe and how much toilet paper the user discharges is taken into consideration. Therefore, there are problems that the effect of preventing clogging of the drainage pipe is insufficient and that an excessive amount of washing water may be discharged.

JP-A-2000-282538 Japanese Unexamined Patent Publication No. 2013-07221 Japanese Unexamined Patent Publication No. 2001-303369

As mentioned above, some conventional flush toilets perform equipment protection cleaning to prevent clogging of drainage pipes, but the execution timing of the equipment protection cleaning depends on conditions such as the number of times the flush toilet has been used. It was decided, and it was only a prediction of the degree of blockage of the drainage pipe. Therefore, it is not possible to take appropriate measures to prevent clogging according to the specifications of drainage pipes that differ from site to site, the occurrence of steps and changes in the slope of drainage pipes, and accidental fluctuations such as the amount of toilet paper used. There was a problem that it could not be done.
The present invention has been made to solve such a problem, and the subject of the present invention is to estimate the affected state such as blockage and insufficient ventilation due to the transported object in the drainage pipe, and perform cleaning based on the result. It is to prevent the occurrence of clogging that causes defects.

According to the present invention configured to solve the above problems, a bowl for excretion by the user, a drainage pipe having a trap for forming a pool of water in the bowl, and a drainage pipe for supplying wash water to the bowl. In a flush toilet equipped with a cleaning means for discharging excrement from a bowl together with accumulated water from a drainage pipe, it was detected that a siphon action occurred in the drainage pipe laid in the building to which the discharge pipe is connected. It is characterized in that it is provided with a transport state detecting means for improving the transport state, and a control means for switching the operation of the cleaning means based on the detection result from the transport state detecting means to improve the transport capacity in the drainage pipe.

In a flush toilet configured in this way, the inside of the pipeline becomes full due to the stagnant filth such as excrement and toilet paper that remained in the drain pipe at the time of the previous cleaning and the filth that flowed in by this cleaning. By detecting the occurrence of siphon action caused by this, it can be inferred that the drainage pipe is being blocked by stagnant waste, and based on the detection result, cleaning is performed so as to improve the transport capacity in the drainage pipe. The operation of the means can be switched.
Therefore, it is possible to perform appropriate cleaning according to the actual blocked state of the drain pipe, and it is possible to prevent the drain pipe from reaching a blocked state to the extent that the flush toilet overflows. In addition, if siphon action occurs, trap water may be sucked and opened, or problems such as not being able to be discharged or transported due to lack of ventilation may occur, but it is also possible to suppress the occurrence of such problems. You can also do it.

In the present invention, preferably, the water-washing stool is a wash-off type, and includes a water level measuring means for measuring the water level of accumulated water or a pressure measuring means for measuring the pressure downstream of the trap, and the transport state detecting means is a washing means. It is characterized in that it detects that a siphon action has occurred in the drainage pipe based on the measurement result from the water level measuring means or the pressure measuring means while the washing water is being supplied.
In a flush toilet configured in this way, the occurrence of self-siphon action in the drainage pipe due to its own washing can be detected by relatively simple measurements such as water level measurement of accumulated water and pressure measurement downstream of the trap. .. Therefore, it is possible to predict the possibility that the drainage pipe will be clogged with a relatively simple configuration, and it is possible to take measures to improve the transport capacity of the drainage pipe.

In the present invention, preferably, a water level measuring means for measuring the water level of the accumulated water or a pressure measuring means for measuring the pressure downstream of the trap is provided, and the transport state detecting means does not supply the washing water from the washing means. The present invention is characterized in that it is detected that a siphon action has occurred in the drainage pipe based on the measurement result by the water level measuring means or the pressure measuring means.
In the flush toilet configured in this way, the occurrence of the induced siphon action that occurs in this drainage pipe due to the inflow of drainage from other equipment connected to the same drainage pipe other than this flush toilet bowl. It can be detected by relatively simple measurements such as water level measurement of accumulated water and pressure measurement downstream of the trap. Therefore, it is possible to predict the possibility that the drainage pipe will be clogged with a relatively simple configuration, and it is possible to take measures to improve the transport capacity of the drainage pipe.

In the present invention, preferably, the washing means has a water supply means capable of changing the supply time of the wash water supplied to the bowl, and the control means is the amount of wash water supplied to the bowl at one wash by the water supply means. It is characterized by improving the transport capacity in the drainage pipe by changing.
In a flush toilet configured in this way, by lengthening the water supply time in the water supply means, the amount of wash water supplied to the drainage pipe is increased, and in particular, the amount of water following the filth to be transported is increased. By doing so, the transport capacity of the drainage pipe can be improved. Therefore, the transport capacity of the drainage pipe can be improved with a simple configuration.

In the present invention, preferably, the cleaning means includes a water supply means for supplying wash water to the bowl and a discharge pipe line closing means for closing the discharge line, and the control means supplies water with the discharge line closed. By supplying wash water from the means to the bowl, the accumulated water level of the bowl is raised, and the transport capacity in the drain pipe is improved.
In a flush toilet configured in this way, the potential energy of the raised pool water can be raised by supplying wash water to the bowl with the discharge pipe closed. Can be used to improve the transport capacity of drainage pipes. Therefore, the transport capacity of the drainage pipe can be improved without increasing the amount of washing water used.

According to the present invention, it is possible to perform appropriate cleaning according to the actual blocked state of the drain pipe, and it is possible to prevent the drain pipe from reaching a blocked state to the extent that a flush toilet overflows. ..

It is a perspective view which shows the whole structure of the flush toilet in the 1st Embodiment of this invention. It is sectional drawing of the flush toilet in the 1st Embodiment of this invention. It is a system block diagram in the 1st Embodiment of this invention. It is an operation flowchart in 1st Embodiment of this invention. It is a schematic sectional view of the whole structure of the flush toilet in the 2nd Embodiment of this invention, and shows (a) the state which the on-off valve is open, and (b) the state which the on-off valve is closed. It is a system block diagram in the 2nd Embodiment of this invention. It is an operation flowchart in the 2nd Embodiment of this invention. It is a flowchart which shows the subroutine of FIG.

Hereinafter, a flush toilet according to the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing the overall configuration of a flush toilet according to the first embodiment of the present invention.

The flush toilet 1 has a function of storing a ceramic Western-style toilet 11 that receives the excrement of the user and discharges it into the sewage, and a cleaning means for supplying cleaning water to the Western-style toilet 11 for cleaning. It has a case 2 and these are integrally formed. Further, the flush toilet bowl 1 has a toilet seat 23 on which the user sits, and a toilet lid 24 that covers the toilet seat 23 and is rotatably arranged. The flush toilet 1 has an operation / display unit 22 as an accessory device. Information transmission between the operation / display unit 22 and the functional case 2 is performed using infrared rays as a medium. As another embodiment, wireless communication using radio waves or wired signal transmission may be used. The transmitted signal is input to the control means 25, is determined, and each unit is operated.

FIG. 2 is a cross-sectional view of a flush toilet according to the first embodiment of the present invention. FIG. 3 is a system block diagram of a flush toilet according to the first embodiment of the present invention. The system of the flush toilet 1 will be described in detail with reference to FIGS. 2 and 3.

Inside the Western-style toilet bowl 11, a bowl 12 for excretion by the user is formed. A discharge pipe line 13 is formed from the bottom of the bowl 12. A trap 14 having an inverted U shape is formed in the discharge pipe 13, and the accumulated water 12b generated by the trap 14 exists inside the bowl 12, and hygiene consideration including odor is taken. When the user of the flush toilet 1 defecates the Western-style toilet 11 and gives a predetermined washing instruction, the washing water is supplied to the bowl 12 to perform washing. Specifically, at the time of cleaning, cleaning water is supplied to the bowl 12 from the water supply means 19 as the cleaning means housed in the functional case 2. The accumulated water 12b mixed with excrement in the bowl 12 is discharged to the drainage pipe 16 of the building via the drainage socket 15 by the washing water supplied by the water supply means 19.
The water supply means 19 is composed of a solenoid valve, and by opening the valve, city water can be supplied toward the bowl 12. Further, by controlling the valve opening time, it is possible to change the amount of washing water (liter / time) supplied to the bowl 12 at one time.

Further, in the flush toilet 1, a water level measuring means 17 for measuring the water level of the stored water 12b is assembled on the upper part of the rim 12a. Further, in the drainage pipe line 13, a pressure measuring means 18 for measuring the pressure on the downstream side of the top of the trap 14 is assembled to the drainage socket 15. The water level measuring means 17 is composed of a commercially available ultrasonic sensor that measures the water level in a non-contact manner with the stored water 12b using ultrasonic waves. It may be attached not only to face the water level but also to the water depth to measure the boundary between water and air. As a method for measuring the water level, the same effect can be obtained if it is a non-contact method such as infrared rays or laser light. Further, the pressure measuring means 18 is composed of a commercially available pressure sensor capable of measuring both a positive pressure higher than the atmospheric pressure and a negative pressure lower than the atmospheric pressure. As will be described later, since the measurement range is about 0 kPa (0 mmAq) to 500 kPa (50 mmAq), a pressure sensor used for various purposes such as a sphygmomanometer can be diverted.

The washing form of the Western-style toilet bowl 11 in the flush toilet bowl 1 is a wash-off type in which a siphon action does not occur during washing. Therefore, when excrement, toilet paper, and other filth discharged from the flush toilet 1 are not so stagnant in the drain pipe 16 of the building, and a sufficient water flow area is secured within the management of the drain pipe 16. When the Western-style toilet bowl 11 is flushed, the amount of decrease in the water level of the accumulated water 12b is small, and the amount of decrease in the water level falls within a predetermined range from the overflow water level defined by the top of the trap 14. Further, the pressure fluctuation of the drainage pipe 16 of the building also decreases to the extent that it decreases due to the flow of the washing water, and falls within a predetermined range from the atmospheric pressure. In this embodiment, the pressure measuring means 18 is assembled to the drainage socket 15, but even if the pressure measuring means 18 is directly incorporated by opening a part on the downstream side of the top of the trap 14. good.

In addition, the causes of poor cleaning that occur in the flush toilet 1 include accidental use of a large amount of toilet paper and stagnant filth in the drain pipe 16 due to the length, number of bends, inclination, etc. of the drain pipe. Can be mentioned. If this stagnant filth is present in the drainage pipe 16, the flow in the drainage pipe 16 may be obstructed and poor cleaning of the toilet bowl may occur. If stagnant filth is present in the drainage pipe 16 in this way, when the drainage flows into the drainage pipe 16, a state in which the inside of the pipe is full is likely to occur, and a siphon phenomenon occurs when the water is full. It will be easier to do. Therefore, it indicates that stagnant filth exists due to the siphon phenomenon generated when the water is full. Therefore, the siphon phenomenon (self-siphon) that occurs directly in the drain pipe 16 when the water-washing toilet bowl 1 is washed, and the drainage discharged from other devices to the drain pipe 16 when the water-washing toilet bowl 1 is not washed indirectly causes indirect. By detecting the siphon phenomenon (induction siphon) generated in the drainage pipe 16, it is possible to estimate the existence state of stagnant filth in the drainage pipe 16, that is, the transport state of the filth discharged to the drainage pipe 16. When these siphon phenomena occur, the accumulated water 12b inside the trap 14 is sucked, and in the worst case, the environment inside the drain pipe communicates with the toilet, and there is a risk that foul odors, pathogens, sanitary pests, etc. invade the toilet. .. Further, if sufficient ventilation is not supplied to the flush toilet 1 which is a sanitary equipment, there is a risk that the discharge operation is hindered or the transport operation in the drain pipe 16 cannot be performed without any trouble.

Therefore, in order to detect the occurrence of these self-siphons and induction siphons, in the flush toilet 1 in the first embodiment, the water level drop of the accumulated water 12b by the water level measuring means 17 is detected, and the pressure measuring means is also used. 18 measures the pressure in the discharge pipe 13 that indirectly promotes the decrease in the water level of the stored water 12b.
When the occurrence of self-siphon or induction siphon is detected, the amount of washing water is increased to improve the transport capacity in the drainage pipe 16, thereby preventing the flush toilet bowl 1 from being poorly washed. There is.

Hereinafter, a specific operation sequence of the flush toilet 1 in the first embodiment will be described.
FIG. 4 is an operation flowchart of a flush toilet according to the first embodiment of the present invention. This operation shows an operation sequence by a control program stored in the control means 25 of the flush toilet 1.

When the power is turned on to the flush toilet 1, the operation sequence is started (S100). Then, as an initial treatment, the first washing time t1 second is set in the washing time timer T that determines the time for supplying the washing water to the washing urinal 1 (S102), and the first washing time t1 is 4 to the washing urinal 1. The time during which 8.8 liters / time of wash water can be supplied is, for example, about 10 seconds. Subsequently, it is determined whether or not the cleaning operation has been performed (S104).

When it is determined in S104 that the toilet bowl cleaning operation has not been performed (S104Yes), the water level of the pooled water 12b is measured by the water level measuring means 17, and it is determined whether the measured water level H is lower than the first specified water level h1. Judgment (S106). The first specified water level h1 is a water level that is significantly lower than the water level of the normal pool water 12b determined by the top of the trap 14, and siphons (induces) the drain pipe 16 when drainage from other equipment is performed. A siphon) is generated, and the negative pressure generated by the siphon action sucks the stored water 12b of the flush toilet 1 to determine that the water level of the stored water 12b is low. For example, the water level is set to be about 20 mm lower than the normal water level. When it is determined in S106 that the measured water level H is not lower than the first specified water level h1, that is, the water level is h1 or higher (S106 No), the pressure is measured by the pressure measuring means 18, and the measured pressure P is the first. It is determined whether the pressure is smaller than the specified pressure p1 (S108). This first specified pressure p1 is a pressure significantly lower than the atmospheric pressure, and when drainage from other equipment is performed on the drain pipe 16, a siphon action (induction siphon) is generated, and the siphon action causes the siphon action. It is a pressure for determining that the air in the discharge pipe 13 of the flush toilet 1 is sucked by the generated negative pressure and becomes a negative pressure. For example, a pressure about 250 kPa (20 mmAq) smaller than the atmospheric pressure is set. When it is determined in S108 that the measured pressure P is not smaller than the first specified pressure p1, that is, the pressure is p1 or higher (S108No), the process returns to S104 and the presence or absence of the cleaning operation is determined.

On the other hand, in S106 or S108, if it is determined that the measured water level H is lower than the first specified water level h1 (S106Yes), or if the measured pressure P is determined to be smaller than the first specified pressure p1 (S108Yes). ), In this case, it is determined that the induction siphon has occurred in the drainage pipe 16, and the cleaning time t2 is set in the cleaning time timer T (S110). The second washing time t2 is longer than the initially set first washing time t1, and is a time during which 6 liters / time of washing water can be supplied to the flush toilet 1, for example, 13 seconds. .. As described above, when it is estimated that the induction siphon is generated, the flush toilet 1 is washed by changing the set value of the washing time timer T so that the amount of washing water supplied at the time of flushing the flush toilet 1 is increased. The amount of washing water supplied to the drain pipe 16 at the time of cleaning can be increased, and the transport capacity of the drain pipe 16 can be improved.

Next, an operation sequence when a flush operation is performed on the flush toilet 1 will be described.
When it is determined that the washing operation has been performed in S104 (S104Yes), the water supply means 19 opens and the water supply of the washing water to the bowl 12 of the flush toilet 1 is started (S112). Subsequently, the water level of the pooled water 12b is measured by the water level measuring means 17, and it is determined whether the measured water level H is lower than the second specified water level h2 (S114). The second specified water level h2 is a water level that is significantly lower than the water level of the normal pool water 12b determined by the top of the trap 14, and a siphon action (self-siphon) occurs in the drainage pipe 16 during cleaning, and the siphon action occurs. It is a water level for determining that the accumulated water 12b of the flush toilet 1 is sucked by the negative pressure generated by the above and the water level of the accumulated water 12b is lowered. For example, in order to detect a state in which the accumulated water 12b is almost exhausted, a water level lower than the normal water level by about 40 mm is set. When it is determined in S114 that the measured water level H is not lower than the second specified water level h2, that is, the water level is h2 or higher (S114No), the pressure is measured by the pressure measuring means 18, and the measured pressure P is the second. (Ii) It is determined whether the pressure is smaller than the specified pressure p2 (S116). This second specified pressure p2 is a pressure significantly lower than the atmospheric pressure, and a siphon action (self-siphon) is generated in the drain pipe 16 during cleaning, and the negative pressure generated by the siphon action causes the flush urinal 1 It is a pressure for determining that the sewage in the discharge pipe line 13 of the above is sucked and becomes a negative pressure. For example, a pressure about 250 kPa (20 mmAq) smaller than the atmospheric pressure is set.

When it is determined in S116 that the measured pressure P is not smaller than the second specified pressure p2, that is, the pressure is p2 or higher (S116No), the elapsed time from the start of water supply is registered in the cleaning time timer T. It is determined whether the time has passed (S118). The time registered in the cleaning time timer T is either t1 second or t2 second. Then, when it is determined that the elapsed time from the start of water supply has passed the registration time of the washing time timer T (S118Yes), the water supply means 19 is closed to stop the supply of washing water and wash. Register t1 second in the time timer T.

On the other hand, in S114 or S116, it is determined that the measured water level H is lower than the second specified water level h2 (S114Yes), or the measured pressure P is determined to be smaller than the second specified pressure p2 ( S116Yes), in this case, it is determined that a self-siphon has occurred in the drainage pipe 16, and the time t2 seconds is registered in the cleaning time timer T (S122). This t2 second is a time longer than the time t1 second, as in S110. Then, it is determined whether the elapsed time from the start of water supply is the registration time of the cleaning time timer T, that is, t2 seconds has elapsed (S124). Then, when it is determined that the elapsed time from the start of water supply has passed t2 seconds, which is the registration time of the cleaning time timer T (S124Yes), the water supply means 19 is closed to stop the supply of cleaning water. To do.

As described above, when it is detected that the self-siphon has occurred (S114Yes or S116Yes) in the case where the washing operation is performed and the flush toilet bowl 1 is washed, the registration time T of the washing time timer T is set. By setting t2 seconds (S122), the washing water supply time of the flush toilet bowl 1 once becomes longer than that of the initial setting time of t1 second, and is supplied to the drain pipe 16 when the flush toilet bowl 1 is washed. The amount of cleaning water can be increased, and the transport distance can be increased, so that the transport capacity of the drain pipe 16 can be improved.

Further, even when the occurrence of the self-siphon is not detected (S114No and S116No), when the occurrence of the inductive siphon is detected, the time t2 seconds is registered in the cleaning time timer T (). S110) The amount of wash water supplied at the time of flushing the flush toilet 1 once becomes longer than the initial set amount of t1 second, and the amount of wash water supplied to the drain pipe 16 at the time of flushing the flush toilet 1. It is possible to improve the transport capacity of the drainage pipe 16 by increasing the transport distance.

Further, even if the cleaning time timer T is set to t2 seconds, if t2 seconds have passed without detecting the occurrence of the self-siphon (S118Yes), it is estimated that there is little stagnant filth in the drain pipe 16. Therefore, by registering t1 second in the washing time timer T (S120), the amount of washing water is not increased at the next washing, and a large amount of washing water is not wasted.

In the above description, in the flush toilet bowl 1 of the first embodiment, the amount of wash water (liter / time) to be flowed at one wash is increased in order to improve the transport capacity of the drain pipe 16. However, the amount of cleaning water at the time of one cleaning may not be changed, and the transport capacity of the drain pipe 16 may be improved by repeating the cleaning operation twice or more. In this case, high energy is supplied from a high head by the second cleaning in a state where the backpack water is formed on the upstream side of the stagnant filth by the first cleaning, so that high transport performance can be expected.

<Second embodiment>
Next, a second embodiment of the present invention will be described.
The same configuration as in the first embodiment is designated by the same function code, and detailed description thereof will be omitted.
FIG. 5 is a schematic cross-sectional view of the overall configuration of a flush toilet according to the second embodiment of the present invention, showing (a) a state in which the on-off valve is open and (b) a state in which the on-off valve is closed.

As shown in FIG. 5, the basic configuration of the flush toilet 100 is the same as that of the first embodiment, but in the flush toilet 100 of the second embodiment, the drain socket 15 has an on-off valve ( It has a movable part) 151. The on-off valve 151 is normally maintained in an open state as shown in FIG. 5A, and does not block the cross-sectional area of the flow path of the drainage socket 15. On the other hand, when the on-off valve 151 detects the occurrence of a siphon action in the drainage pipe 16, the flow path of the drainage socket 15 is used to wash the flush toilet bowl 1 having improved transport performance for the drainage pipe 16. The cross-sectional area can be reduced. That is, the on-off valve 151 mechanically reduces the discharge pipe line 13 on the downstream side of the top of the trap 14. In other words, the on-off valve 151 can mechanically reduce the amount of the wash water supplied to the bowl 12 discharged to the drain pipe 16.

Specifically, the on-off valve 151 has a support shaft 152 driven by a motor (not shown), and is rotatably supported by the support shaft 152 with respect to the drainage socket 15. As shown by the arrow A1 shown in FIG. 5A, the on-off valve 151 can be rotated around the support shaft 152 as a substantially center. Then, as shown in FIG. 5B, the on-off valve 151 can narrow the cross-sectional area of the flow path of the drainage socket 15 so that the flow path of the drainage socket 15 is substantially closed.

The on-off valve 151 does not need to completely close the flow path of the drainage socket 15. That is, in a state where the on-off valve 151 closes the flow path of the drain socket 15, the water level of the accumulated water 12b in the bowl 12 is determined by the washing water supplied to the bowl 12, and the initial water level is defined by the top of the trap 14. If the water level can be raised above (overflow water level), a gap may be formed between the on-off valve 151 and the flow path of the drainage socket 15.

When flushing the flush toilet 100, the on-off valve 151 is operated to narrow the cross-sectional area of the flow path of the drain socket 15. As a result, the washing water supplied to the bowl 12 is blocked by the drainage socket 15, stays in the bowl 12, and the water level of the stored water 12b rises. After the water level of the pooled water 12b rises to a predetermined water level, the on-off valve 151 is rotated as shown by the arrow A2 shown in FIG. 5 (b). Then, a large amount of washing water that stays in the bowl 12 and whose head pressure has increased due to the rise in water level can be discharged from the drain socket 15 to the drain pipe 16. According to this, the flow rate (liter / minute) of the washing water discharged to the drainage pipe 16 can be increased, and as a result, the transport capacity in the drainage pipe 16 can be improved.

FIG. 6 is a system block diagram according to the second embodiment of the present invention. The drainage socket 15 has an on-off valve 151. The on-off valve 151 is normally maintained in an open state as shown in FIG. 5A, and the cross-sectional area of the flow path of the drainage socket 15 is hardly reduced. On the other hand, the on-off valve 151 has a drain socket 15 as shown in FIG. 5 (b) in order to improve the transport capacity when a concern that stagnant filth may exist in the drain pipe 16 is detected as described later. The cross-sectional area of the flow path can be changed. That is, the on-off valve 151 can raise the water level of the accumulated water 12b in the bowl 12 by mechanically closing the discharge pipe line 13, and utilizes the head pressure of the accumulated water 12b to obtain a normal water level. It means that the transport capacity inside the drainage pipe 16 is improved by the drainage with a stronger force than that at the time of cleaning.

Hereinafter, a specific operation sequence of the flush toilet 100 in the second embodiment will be described.
FIG. 7 is an operation flowchart according to the second embodiment of the present invention, and FIG. 8 is a flowchart showing the subroutine of FIG. 7.
In the operation flowchart in the second embodiment, S200 to S208 are the same as S100 to S108 in the operation flowchart of the first embodiment, and thus description thereof will be omitted in detail. In this second embodiment, one of the differences from the first embodiment is the processing in S210, and this point will be described.

In S206 or S208, when it is determined that the measured water level H is lower than the first specified water level h1 (S206Yes), or the measured pressure P is determined to be smaller than the first specified pressure p1 (S208Yes), this In this case, it is determined that the induction siphon has occurred in the drainage pipe 16, and the blockage cleaning is executed (S210). This blockage cleaning is performed in order to improve the transport capacity of the drainage pipe 16 as compared with the normal cleaning.

This blockage cleaning will be described in detail with reference to FIG.
When the blockage cleaning is started, the on-off valve 151 is closed as shown in FIG. 5 (b) (S300). Subsequently, the water supply means 19 is opened to start supplying wash water to the bowl 12 of the flush toilet 100 (S302). After that, it is determined whether the elapsed time from the start of water supply has passed U1 seconds (S304), and the operation in this state is continued until U1 seconds have elapsed (S304No). In this continuous operation state, the washing water is supplied to the bowl 12 with the on-off valve 151 closed, so that the supplied washing water hardly flows out to the drain pipe 16 and the discharge pipe line 13 becomes full. After that, the water level of the accumulated water 12b rises without flowing out of the bowl 12. The time U1 second is set to a time during which the water level of the pooled water 12b in the bowl 12 can rise and does not overflow from the upper end of the rim 12a.

When the elapsed time from the start of water supply exceeds U1 seconds (S304Yes), the on-off valve 151 is opened (S306). Then, the accumulated water 12b whose water level is rising in the bowl 12 receives the head pressure and is vigorously discharged toward the drainage pipe 16. Therefore, even in the drainage pipe 16, the washing water flows more vigorously than in the normal washing. Therefore, the transport capacity of the drainage pipe 16 can be improved.

After that, when it is determined that the elapsed time from the start of water supply has passed U2 seconds (U2 seconds> U1 seconds) (S308Yes), the water supply means 19 is closed to end the supply of wash water (S310), and this blockage wash subroutine is used. Is finished and returns to the main route of FIG. 7 (S312). In this way, after opening the on-off valve 151 in S306, the washing water is supplied for a period of U2 seconds to U1 seconds, so that when the on-off valve 151 is opened, the flush toilet 100 discharge pipe line 13 Alternatively, even if a siphon action occurs in the drain pipe 16 and the accumulated water in the bowl 12 of the flush toilet 100 is sucked out due to the siphon action, the accumulated water can be restored (refilled).

Returning to FIG. 7, an operation sequence when a flush operation is performed on the flush toilet 1 will be described.
In the operation flowchart in the second embodiment, S212 to S220 are the same as S112 to S120 in the operation flowchart of the first embodiment, and thus detailed description thereof will be omitted. In this second embodiment, one of the differences from the first embodiment is the processing in S222 and later, and this point will be described.

In S214 or S216, it is determined that the measured water level H is lower than the second specified water level h2 (S214Yes), or the measured pressure P is determined to be smaller than the second specified pressure p2 (S216Yes). In this case, since it is estimated that a self-siphon has occurred in the drainage pipe 16, it is determined that the elapsed time from the start of water supply has passed t1 second, which is the registration time of the cleaning time timer T ( S222Yes), blockage cleaning is a matter. It should be noted that this blockage cleaning is executed based on the subroutine of FIG. 8, and since it is as described above, detailed description thereof will be omitted.

As described above, when it is detected that the induction siphon is generated in the standby state where the washing operation is not performed (S204Yes or S206Yes), and when the washing operation is performed and the flush toilet bowl 1 is washed. When it is detected that a self-siphon has occurred (S214Yes or S216Yes), the momentum of the washing water discharged from the flush toilet 100 to the drain pipe 16 is performed by performing a blockage cleaning different from the normal cleaning. That is, the flow rate per unit time can be increased, and the transport capacity can be increased, so that the transport capacity of the drain pipe 16 can be improved.

Further, since the blockage cleaning when the occurrence of the self-siphon is detected is executed following the normal cleaning (S222), the cleaning operation is substantially repeated twice. Therefore, in a state where the cleaning water supplied at the time of normal cleaning is retained on the upstream side of the stagnant filth in the drainage pipe 16, the cleaning water with momentum at the time of closed cleaning is supplied, and the accumulated cleaning is performed. The total amount of water and the washing water supplied by the block cleaning will collide with the stagnant filth, and the transport performance of the stagnant filth can be further improved.

In the above description, in the flush toilet 100 according to the second embodiment, the discharge pipe line 13 is blocked by the on-off valve 151 at the initial stage of cleaning in the block cleaning operation sequence for improving the transport capacity of the drain pipe 16. However, the closing timing does not have to be the initial stage of cleaning.
In particular, when the flush toilet 100 switches between front rim water discharge, jet water discharge from the jet water discharge port 10 (see FIG. 5), and rear rim water discharge to discharge water, the on-off valve 151 is driven to discharge the discharge pipe in the rear rim water discharge. It is preferable to block the road 13.

The embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. With respect to the above-described embodiment, those skilled in the art with appropriate design changes are also included in the scope of the present invention as long as they have the features of the present invention.
For example, although it was a form in which both the generation of the induction siphon and the generation of the self-siphon were detected, one of them may be detected to improve the transport capacity of the drainage pipe.
Further, in order to detect the occurrence of the induction siphon and the self-siphon, it is not necessary to have two detection means of the water level detecting means and the pressure detecting means, and it may have any one of them.

Further, when two detection means are provided, the induction siphon or the self-siphon is detected based on the detection of either one, but when both detection means detect the induction siphon or the self-siphon. It may detect the occurrence of a self-siphon.
Further, the first embodiment and the second embodiment may be combined, and the closed cleaning of the second embodiment may be performed after the cleaning is completed, and the volume-increasing cleaning may be performed with a longer cleaning time at the next cleaning.

Further, when the induction siphon or the self-siphon is detected, a notification to that effect may be given. From this notification, the user can know that there is a high possibility that stagnant filth is present in the drainage pipe 16 and that the drainage pipe is likely to be clogged. Users themselves increase the setting of the amount of flush water for toilet bowls, reduce the amount of toilet paper used, and regularly perform cleaning to protect equipment to discharge stagnant filth inside the drain pipe. The clogging of the drainage pipe 16 can be prevented by the act of.

Further, when the notification is frequently performed, it can be known that it is necessary to request maintenance or the like. For example, the soil may be uneven or inclined due to the influence of an earthquake or the like. The building may also be tilted due to heavy load or environmental changes, and the resulting load force may cause gaps in the drainage pipe connection. As a result, the drainage pipe 16 has an increased risk of stagnation of filth, but the risk can be known by frequent notification, and the user can perform drainage pipe maintenance work such as removing corrosive substances inside the drainage pipe and adjusting the gradient. By asking a contractor to carry out the work, it is possible to obtain information for using the building with high reliability for a long time.

1,100 ... Flush toilet 2 ... Functional case 10 ... Jet spout 11 ... Western-style toilet 12 ... Bowl 12a ... Rim 12b ... Reservoir 13 ... Drainage line 14 ... Trap 15 ... Drainage socket 16 ... Drainage (of the building) Piping 17 ... (reservoir) water level measuring means 18 ... (drainage piping) pressure measuring means 19 ... water supply means 22 ... operation / display 23 ... toilet seat 24 ... toilet lid 25 ... control means 123 ... discharge pipeline 151 ... opening and closing Valve 152… Support shaft

Claims (5)

A bowl for excretion by the user and
A drainage line with a trap that forms a pool of water in the bowl,
A cleaning means that supplies cleaning water to the bowl and discharges excrement from the bowl together with the accumulated water from the discharge pipe.
In a flush toilet equipped with
A transport state detecting means for detecting that a siphon action has occurred in a drainage pipe laid in a building through which the discharge pipe is connected, and a transport state detecting means.
Based on the detection result from the transport state detecting means, the control means for switching the operation of the cleaning means to improve the transport capacity in the drainage pipe, and
A flush toilet that features a flush toilet. The flush toilet is a wash-off type and is
A water level measuring means for measuring the water level of the accumulated water,
Alternatively, a pressure measuring means for measuring the pressure downstream of the trap is provided.
The transport state detecting means is based on the measurement result from the water level measuring means or the pressure measuring means while the washing water is being supplied from the washing means.
The flush toilet according to claim 1, which detects that a siphon action has occurred in the drainage pipe. The transport state detecting means includes a water level measuring means for measuring the water level of the pooled water or a pressure measuring means for measuring the pressure downstream of the trap, and the transport state detecting means is said to be in a state where the washing water is not supplied from the washing means. The water-washing stool according to claim 1, wherein a siphon action is detected in the drain pipe based on the measurement result by the water level measuring means or the pressure measuring means. The washing means has a water supply means capable of changing the supply time of the wash water supplied to the bowl, and the control means changes the amount of wash water supplied to the bowl at one washing by the water supply means. The flush toilet according to claim 2 or 3, wherein the transport capacity in the drainage pipe is improved by the above. The cleaning means includes a water supply means for supplying washing water to the bowl and a discharge pipe line closing means for closing the discharge line, and the control means has the water supply means in a state where the discharge line is closed. The water-washing toilet according to claim 2 or 3, wherein the washing water is supplied from the water to the bowl to raise the pooled water level of the bowl to improve the transport capacity in the drain pipe.

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