JP2007138432A - Flush toilet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a flush toilet capable of setting the water level of water collected in a bowl in the optional water level with a considerable degree of accuracy by the best fixed trap type flush toilet as sanitary equipment. <P>SOLUTION: The flush toilet has at least two washing water supply means having different instantaneous supply capacities, a supply is started by the first water supply means having the larger instantaneous supply capacity based on the measuring result of the water level measuring means of the bowl, and the supply is made by the second water supply means having the smaller instantaneous supply capacity on the way to form the water level of water collected in the bowl (the target water level) higher than the water level of seal water and lower than the overflowing water level overflowing from the trap. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flush toilet, and in particular, relates to a flush toilet capable of accurately setting the water level in a bowl to an arbitrary water level.

  The water in the bowl of the flush toilet is formed in the toilet cleaning process after defecation in order to prevent the stool from adhering to the bowl surface during the next defecation. In relation to the phenomenon, the state of occurrence of both is contradictory to the water level of the stored water. Here, there are individual differences in the defecation form of the user, and the above-mentioned phenomenon also changes depending on the state. Therefore, the appropriate stored water level for preventing the occurrence of these phenomena varies from user to user. As one of the countermeasures, a method of forming the stored water level to an appropriate arbitrary water level according to individual circumstances can be considered.

  Furthermore, in recent years, not only as a conventional toilet, but also using a toilet bowl as a collection container for urine excreted by a subject, measuring the amount of change in the water level of the bowl, measuring the amount of urine as a health management index・ Use as a toilet for measuring urine flow rate and urine flow rate is also considered.

  In this case, the range of urine volume that can be measured is the volume in the bowl between the level of the stored water before urination starts and the overflow water level that overflows from the trap to the sewage pipe. The flush toilet has a sealed water level, which is the water level required to seal the sewage pipe, and an overflow water level that starts overflowing the sewage pipe beyond the trap, ensuring a large urine volume measurement range. For this purpose, it is necessary to accurately set the water level before urination to the lowest possible water level above the sealing water level.

  For example, Patent Document 1 discloses that the water level of a bowl is set to an arbitrary water level by water supply control. This is to control the water supply time and amount of water supplied by the water supply means and set the water level of the bowl to an arbitrary water level. In the examples of the publication, a method for setting the target water level by controlling the opening and closing time of the valve provided in the washing water supply path, or attaching an ultrasonic sensor to the rim part of the flush toilet while monitoring the water level of the bowl A method for setting the target water level is described.

  Here, the toilet flushing process of the flush toilet bowl is a bowl washing process in which the bowl surface is washed by discharging water from the rim spout provided at the upper end of the toilet bowl, and the accumulated water containing excrement in the bowl is discharged to the sewer pipe. It consists of a filth discharge process and a stored water forming process for forming a predetermined amount of stored water in the bowl. In the bowl washing process, in order to wash away the dirt attached to the inner surface of the bowl, the water supply means to be used generally requires a large instantaneous flow rate of at least about 20 L / min. Further, in the filth discharge process, in order to completely discharge the filth, a larger instantaneous flow rate is required, and therefore various devices for amplifying the instantaneous flow rate of the water supply means have been made.

  In addition, in order to prevent the generation of a strange odor from the sewer pipe in the accumulated water formation process, after draining the accumulated water containing excreta to the sewage pipe, quickly form the accumulated water and seal the connection to the sewage pipe. Since it is necessary, the water is usually supplied at the same large instantaneous flow rate by the same water supply means as the bowl cleaning process.

  The toilet bowl described in Patent Document 1 also uses the water supply means having the above-described configuration. Therefore, since the instantaneous flow rate of the water supply means to be used is large, even if the on-off valve is controlled while detecting the water level in the bowl, the amount of water supplied actually varies greatly due to factors such as variations in valve responsiveness. As a result, the water level in the bowl cannot be set with high accuracy.

JP-A-3-090746

  The present invention has been made to solve the above-described problems, and realizes a flush toilet capable of accurately setting the water level of a bowl in an arbitrary water level while maintaining the function of a conventional toilet.

In order to achieve the above object, according to the first aspect of the present invention, a bowl for receiving a user's excrement, the bowl and a sewage pipe are communicated with each other, and a stored water for sealing the sewage pipe is formed in the toilet bowl. And a water supply means for supplying water into the bowl, and the water supply means sets the water level of the accumulated water to an arbitrary target water level equal to or lower than the overflow water level, which is the water level at which the accumulated water overflows the sewer pipe. In a flush toilet having a reservoir forming step to form,
The water supply means has a bowl water level measuring means for measuring the bowl water level of the stored water and a plurality of water supply operation modes having different instantaneous supply capacities, and the water supply to the bowl in the stored water forming step is switched to a predetermined level. Up to the water level, the first water supply operation mode having the largest instantaneous supply capability among the plurality of water supply operation modes is performed, and then the instantaneous supply capability is determined based on the water level measurement result of the bowl water level measurement means. By performing in a second water supply operation mode smaller than the operation mode, a stored water level is formed at the target water level.

  As a result, the high-speed operation mode for supplying water at a high speed necessary for forming the reservoir water and the low-speed operation mode for easy supply amount control are combined, and the water supply control is performed while measuring the water level difference from the target water level. Therefore, the stored water level of the bowl can be formed at an arbitrary water level (target water level) in a short time and with high accuracy.

  The invention according to claim 2 is the invention according to claim 1, wherein the switching water level is set to be equal to or higher than a sealed water level that is a minimum water level at which a trap port opened in the bowl of the toilet is completely submerged. It is characterized by being.

  As a result, up to the sealed water level, the trap port is sealed from the discharge of filth because the water supply means supplies in the first water supply operation mode having the largest instantaneous supply capability among the plurality of water supply operation modes having different instantaneous supply capacities. The time until watering is shortened, and the backflow of the sewage odor from the trap port can be reduced.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the bowl water level measuring means detects a predetermined closed water level in the water supply operation up to the switching water level in the first water supply operation mode. It is characterized by stopping by.

  As a result, the stored water level of the bowl is directly measured and the operation in the first water supply operation mode is controlled, so that the bowl cross-sectional area variation between individuals and the supply amount reproducibility due to the individual difference of the first water supply means are reduced. Since the switching water level can be formed without being affected by the variation, the ratio of the supply amount in the first water supply operation mode to the water supply amount necessary for the formation of the accumulated water can be increased. As a result, the switching water level can be formed at a water level close to the target water level, and the time for forming the stored water level at the target water level can be shortened.

  According to a fourth aspect of the present invention, in the first or second aspect of the present invention, the water supply operation up to the switching water level in the first water supply operation mode is stopped when a predetermined closing time elapses from the start of water supply. It is characterized by that.

  As a result, the control for forming the switching water level can be performed with a simple configuration.

  Further, the invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the relational expression for obtaining the correspondence between the bowl water level and the amount of stored water is obtained, and the first water supply operation mode is used. The amount of stored water corresponding to the difference in water level between the measured water level obtained by measuring the water level of the formed switching water level with the bowl water level measuring means and the target water level is obtained from the relational expression, and the obtained amount of stored water is calculated. Water is supplied as the additional water supply amount in the second water supply operation mode.

  As a result, the target water level can be accurately formed only by measuring the formed switching water level.

  The invention according to claim 6 provides the water supply operation up to the target water level in the second water supply operation mode according to any one of claims 1 to 4, wherein the bowl water level measuring means is in the vicinity of the target water level. The water level is stopped by detecting a predetermined closed water level set at the water level.

  Accordingly, the second water supply operation is controlled while monitoring the target water level formed in the second water supply operation mode, so that the target water level can be formed with high accuracy.

  The invention according to claim 7 is the invention according to any one of claims 1 to 6, wherein a difference in water level between the formed water level and the target water level is predetermined after the water supply operation in the reservoir water forming step is completed. In the case of exceeding the range, a water replenishing step of repeatedly performing the water replenishment operation and the stored water level measurement in the second water supply operation mode until the water level difference falls within a predetermined range is provided.

  As a result, the target water level can be accurately formed even when an unexpected factor that affects the amount of water supply in the accumulated water formation process such as a sudden change in the water supply pressure occurs.

  The invention according to claim 8 is the invention according to any one of claims 1 to 7, wherein the water supply means reduces the instantaneous flow rate with the elapsed time in the water supply operation in the second water supply operation mode. A change means is provided.

  As a result, the instantaneous flow rate in the vicinity of the completion of the operation in the dominant second water supply operation mode can be further reduced with respect to the accumulated water level accuracy of the bowl, so that the target water level can be accurately formed.

  The invention according to claim 9 is the invention according to any one of claims 1 to 8, wherein the water supply means is configured to discharge water provided below the switching water level when supplying water in the second water supply operation mode. Water is supplied to the bowl from a water inlet.

  As a result, the undulation of the bowl in the second water supply operation mode can be suppressed, the water level in the bowl can be measured with higher accuracy, and the target water level can be formed with higher accuracy.

  The invention according to claim 10 is the invention according to any one of claims 1 to 9, wherein the water supply means includes target water level changing means capable of changing the target water level.

  This makes it possible to set the appropriate water level in the bowl for each site and for each user.

  The invention according to claim 11 is the invention according to any one of claims 1 to 10, further comprising a stored water amount calculation means for obtaining a stored water amount from a stored water level of the bowl, wherein the target water level is calculated. After the formation, urination information including at least the amount of urine excreted by the user into the bowl is obtained from the change in the stored water level due to urination measured by the bowl water level measuring means.

  As a result, the volume change of the bowl due to excretion can be measured from the difference in the water level of the bowl before and after excretion, and the amount of urine excreted in the bowl can be calculated. Moreover, the urinary excretion rate (urine flow rate) can be calculated by measuring the difference in the level of stored water per hour during excretion.

  The optimum water level in the bowl for fishing during stool and the optimum water level in the bowl for splashing during men's urine depends largely on the user. Rather than setting the bowl water level that everyone can be satisfied with, this configuration, which can be set to the optimum water level of the bowl for each user, is effective as a measure against water splashing during stool and men's urine. It becomes a means. It is also an effective means for a toilet for measuring urine volume and urine flow rate, in which it is necessary to strictly form the stored water level at an arbitrarily set water level.

(First embodiment)
A first embodiment of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a water channel configuration diagram showing the configuration of the water channel system in the first embodiment, and FIG. 2 is a graph showing the relationship between the elapsed time of the water storage forming step and the water storage water level in the bowl in the first embodiment, FIG. 3 is a flowchart showing the operation flow of the water supply means in the toilet cleaning in the first embodiment, and FIG. 4 is the operation timing of the water supply means in the toilet cleaning in the first embodiment, the instantaneous flow rate of each flow path, and the bowl water storage The timing chart which showed the relationship of the water level is shown.

  First, the configuration of the first embodiment will be described with reference to FIG. The toilet bowl 51 used in the present embodiment includes a bowl 1 for receiving a user's excrement (urine and stool), a trap 2 for sealing a sewage pipe to form accumulated water, a trap 2 and a sewage pipe. A drainage channel comprising a drainage socket 3 for connecting the bowl 1, a bowl water supply channel 4 having a discharge port disposed at the upper end of the bowl 1 for cleaning the inner surface of the bowl 1 and forming the accumulated water in the bowl 1, and a trap 2 And a jet water supply channel 5 connected to a jet nozzle 16 for discharging water and discharging sifts to discharge filth.

  Furthermore, in this embodiment, the water supply means for supplying water such as washing water to the bowl surface of the toilet bowl is a first water supply means capable of supplying water to the bowl water supply path 4 or the jet water supply path 5 at a large instantaneous flow rate (flow rate per unit time). A second water supply means having an ability to supply an instantaneous flow rate smaller than the first water supply means, a bowl water level measuring means for confirming the water level of the water stored in the bowl 1, and a control means (not shown) for controlling these means. And. Details of the configuration will be described below.

  The first water supply means is connected to the secondary side of the constant flow valve 20a and the constant flow valve 20a provided in the middle of the first supply flow path 11 connected to the bowl water supply path 4 and the jet water supply path 5. There is provided an on-off valve 9c formed of a pilot diaphragm valve, and a flow path switching valve 12 that is connected to the secondary side of the on-off valve 9c and that switches a flow path for supplying water to the bowl water supply path 4 or the jet water supply path 5. .

  The flow path switching valve 12 is a two-way switching valve having one water inlet port 13 and two water outlet ports 14 a and 14 b, one of which communicates with the bowl water supply path 4 and the other with the jet water supply path 5. In the standby state, the water inlet port 13 and the water outlet port 14a communicate with each other.

  The water supply amount of the first water supply means supplied to the bowl 1 is determined from the instantaneous flow rate managed by the constant flow valve 20a and the supply time managed by the control unit. Here, the pilot-type diaphragm valve that opens and closes an instantaneous flow rate of about 20 L / min, which is used to open and close a large flow rate with a small drive energy using water pressure as the on-off valve 9c, Since the pressure increase time varies, the variation in the closing operation time is larger than that of an on-off valve having a normal simple structure.

  The second water supply means is provided in parallel with the first supply flow path 11, a second supply flow path 15 that branches from the water supply source and communicates with the water supply tank 21, and a constant supply provided in the middle of the second supply flow path 15. A flow valve 20b, an on-off valve 9d connected to the secondary side of the constant flow valve 20b, a water supply tank 21 for temporarily storing wash water from the on-off valve 9d, and a water level in the water supply tank 21 are detected. The water level sensors 22a and 22b, a water supply tank 21 and a jet port connecting passage 15a that communicates with the lowermost end of the jet passage 5, and on-off valves 9a and 9e that open and close the jet port connecting passage 15a. Water is supplied to the bowl 1 using a head difference between the surface of the stored water and the water surface of the water supply tank 21.

  The water supply amount of the second water supply means supplied to the bowl 1 includes the instantaneous flow rate managed at about 3 L / min by the fixed orifice 26 provided at the outlet of the water supply tank 21 and the supply time managed by the control unit. It is determined from. The constant flow valve 20b restricts the instantaneous flow rate of the cleaning water into the water supply tank 21, and the instantaneous flow rate is set to approximately 2 L / min.

  The water level sensor 22ab that controls the driving of the on-off valve 9d includes a water level sensor 22a that detects the upper limit of the water level in the water supply tank 21 and a water level sensor 22b that detects the lower limit of the water level of the water supply tank 21. The water level sensor 22a manages the amount of water in the water supply tank 21, and when the water level sensor 22a is turned off, a valve opening signal is sent to the on-off valve 9d to start tank water supply. When the water level sensor 22a is turned on, A closing signal is sent from the control to the on-off valve 9d, and the tank water supply stops. The water level sensor 22b prevents the tank water from being emptied and prevents air from entering the jet port connection path 15a. When the water level sensor 22b is turned off, a closing signal is sent from the control unit to the on-off valve 9d. Thus, the jet port connecting path 15a is blocked to prevent air mixing.

  Furthermore, an overflow pipe 23 is provided in the water supply tank 21. When the water level sensor 22a detects and the open / close valve 9d receives a water supply stop signal from the control unit, the water supply does not stop. The washing water passes through the overflow pipe 23, is led from the second drainage channel 10 provided with the trap to the drainage side of the drainage socket 3, and is drained.

  The bowl water level measuring means branches from the pressure sensor 8 for measuring the pressure generated by the water level of the stored water in the bowl 1 and the on-off valve 9a and the on-off valve 9e of the jet port connecting passage 15a to the pressure sensor 8 to store the bowl 1 in the bowl. It has a measurement flow path 7 for transmitting the pressure due to the water level, and an on-off valve 9b for protecting the pressure sensor 8 from a pipe pressure other than during measurement provided in the measurement flow path 7. Further, in order to calibrate the output of the pressure sensor 8, a calibration tube unit 6 including a calibration tube 6a having one end connected to the pressure sensor 8 and the other end opened to the atmosphere, and the calibration tube 6a into the calibration tube unit 6 are incorporated. The second drainage channel 10 guides the overflowing water to the drainage socket 3.

  The calibration tube unit 6 creates a reference water level for the stored water level in the bowl 1, and this output value A and the stored water level in the bowl 1 are based on the pressure sensor output value A when the calibration tube 6 a is at the full water level. By measuring the difference from the output value B of the pressure sensor at the time of measurement, the water level in the bowl 1 is calculated. The full water level of the calibration pipe 6 a is arranged at a position higher than the overflow water level overflowing from the trap 2. This is because when the on-off valve 9a and the on-off valve 9b are opened and the water level in the bowl 1 is measured, consideration is given to prevent sewage in the bowl 1 from flowing into the calibration tube 6a.

  The control means is not only a control unit that controls the operation of the toilet, but also an operation switch (not shown) that is instructed by the user and a target water level changing means for changing the set water level (target water level) of the stored water level. A target water level change dial, which will be described later, is also provided.

  Next, the method of water supply control in the stored water formation process of a present Example is demonstrated. FIG. 2 is a graph showing the relationship between the elapsed time in the accumulated water forming process and the accumulated water level in the bowl, the vertical axis represents the water level in the accumulated water forming process, and the horizontal axis represents the accumulated water forming process in the toilet bowl washing process. The elapsed time after migration is shown. Here, the solid line in the graph shows the case of this example, and the broken line shows the case of another embodiment of the present invention described later. In addition, the position of the air level in the figure is the water level at the bottom of the bowl described in FIG.

  In this embodiment, the switching water level is set to a level higher than the sealing water level of the trap of the toilet 51 according to the set value of the target water level that is the level of the stored water formed in the stored water formation step. Water is supplied to the unit in a first water supply operation mode performed by controlling the first water supply means set to an instantaneous flow rate of approximately 20 L / min by the constant flow valve 20a. Then, from the switching water level, the bowl 1 is supplied in a second water supply operation mode in which the second water supply means set to an instantaneous flow rate of about 3 L / min is controlled by tank water supply using a difference between the fixed orifice and the head. A predetermined target water level is set which is set to a range in which the stored water level is higher than the sealed water level and lower than the overflow water level overflowing from the trap 2.

  In this way, until the switching water level, since the supply is performed in the first water supply operation mode having the largest instantaneous supply capability among the plurality of water supply operation modes having different instantaneous supply capacities of the water supply means, until the sealed water level is reached from the discharge of filth The time required for the trap is shortened, and the time during which the trap is broken can be shortened. Further, from the switching water level, in order to supply in the second water supply operation mode in which the instantaneous supply capacity is smaller than that in the first water supply operation mode based on the result of measuring the water level of the stored water by the bowl water level measuring means, it is performed in the first water supply operation mode. In addition to absorbing the formation error of the accumulated water level formed by the water supply, due to the small instantaneous supply capacity, the fluctuation of the water supply amount due to the fluctuation of the instantaneous flow rate and the response of the water supply means used at this time is also relative Becomes smaller. As a result, the water level in the bowl can be accurately set to an arbitrary water level (target water level) in the range from the sealed water level to the overflow water level.

  The switching water level is set close to the target water level within the range not exceeding the target water level in consideration of the above-mentioned various variations of the water supply means, thereby shortening the formation time while maintaining the target water level formation accuracy. .

  In this embodiment, since the toilet 51 used is a trap-type toilet, the target water level formed by setting the switching water level to be equal to or higher than the sealing water level in consideration of the odor backflow from the sewage pipe is also the sealing water level. As described above, when using a toilet with an open / close valve in the waste discharge line, or when providing a separate deodorizing means, the switching water level and the target water level are set to any water level in the ball by applying the present invention. Is possible.

  With reference to the flowchart shown in FIG. 3 and the timing chart shown in FIG. 4, the operation of the bowl part 1 in this embodiment will be described. The vertical axis in FIG. 4 shows the operation of each element constituting the water supply means and the resulting instantaneous flow rate and bowl water level of each flow path, and the horizontal axis shows the elapsed time.

  When the user presses a toilet flushing switch (not shown) (S11), first, the on-off valve 9c is opened, the water inlet port 13 and the water outlet port 14a of the flow path switching valve 12 communicate with each other, and the washing water flows to the bowl water supply path 4. The bowl water supply for cleaning the supplied bowl 1 surface is started (S12). At this time, the on-off valve 9b and the on-off valve 9e are opened, and calibration pipe water supply in which the water in the water supply tank 21 is led to the calibration pipe 6a is started simultaneously (S31). After the calibration pipe 6a becomes full, the on-off valve 9b and the on-off valve 9e are closed, and sensor calibration is performed to record the sensor output value A at the calibration pipe water level (reference water level) at that time (S32).

  When a predetermined time T1 elapses from the opening of the on-off valve 9c (S13), the flow path switching valve 12 is driven, the water inlet port 13 and the water outlet port 14b communicate with each other, and the wash water is supplied to the jet flow path 5 Is started (S14), and the process proceeds to the waste discharging process. By this water supply, siphon is generated, and the stored water in the bowl 1 containing the excrement is discharged to the sewer pipe.

  Next, after a lapse of T2 time from the opening of the on-off valve 9c (S15), the flow path switching valve 12 is driven, the water inlet port 13 and the water outlet port 14a communicate with each other, and the wash water is guided to the bowl water supply path 4 and the bowl 1 The bowl water supply for forming the stored water is started (S16), and the process proceeds to the stored water forming process.

  After elapse of t1 time from the transition to the accumulated water forming step (S17), a closing signal is sent from the control unit to the on-off valve 9c, and an on-off signal is sent to the on-off valve 9a and the on-off valve 9b. While the water supply stop operation is started, sensing of the sensor 8 for confirming the water level in the bowl is started (S18). Thereafter, when the water supply by the first water supply means is completely stopped and t2 time obtained by an experiment in advance that the spilled water in the bowl 1 is stopped (S19), the water stored in the water is monitored by monitoring the output value of the sensor 8. (S20), the output value B of the sensor 8 at that time is read, and the output value with the output value A of the sensor 8 when the calibration tube 6a is full is confirmed in the bowl washing process. From the difference C (C = B−A), the water level in the bowl at this time is calculated (S21). In this case, if the stability of the output value of the sensor 8 is not recognized at the time when the time t2 has elapsed, appropriate abnormality handling is performed such as determining that there is some abnormality and notifying it (S41).

  Next, based on a calibration curve which is a relational expression between the difference in the stored water level (the difference in water level between the calibration tube water level and the stored water level) and the amount of stored water, the reservoir 1 of the bowl 1 obtained at this time is obtained. The amount of stored water corresponding to the water level difference between the water level and the target water level is obtained, and this is used as the additional water supply. Further, from the obtained additional water supply and the instantaneous supply capacity of the second water supply means to be used next, the target water level is obtained. A valve opening time t3 of the on-off valve 9e necessary for reaching is calculated (S22).

  Next, the on-off valve 9b is closed and the on-off valve 9e is opened, and the water supply in the water supply tank 21 is started to be supplied to the bowl 1 from the water outlet 16 through the water supply passage 5. (S22). After t3 hours from the start of water supply by the second water supply means (S24), a valve closing signal is sent from the control unit to the on-off valve 9a and the on-off valve 9e, and after t4 hours, the on-off valve 9e is completely closed to supply water. Zet water supply including the remaining water in the road is completely stopped (S25), the water level of the reservoir becomes the target water level (H2), and all toilet cleaning operations are completed.

  Therefore, the operating time t1 of the first water supply means used in the first water supply operation mode for determining the switching water level in the stored water formation process is as much as possible without the target switching water level exceeding the target water level even if the obtained switching water level is due to these various variations. A water level close to the water level is set in advance according to the target water level. By setting in this way, it is possible to optimally set the switching water level for switching from the first water supply operation mode to the second water supply operation mode.

  Also, the operation time t3 of the second water supply means is the same as that of the time t1, and the target water level is set with high accuracy by setting the operation time for confirming the above-mentioned variation and the switching water level in consideration of these various variations. It becomes possible to form.

  In the present embodiment, the operation time (t1, t3) of the first water supply means and the second water supply means is set according to the target water level to control the water supply in each water supply operation mode. The integrated flow rate sensor may be provided in the means or the second water supply means, and the water level may be formed by controlling the water supply means while directly monitoring the integrated water supply amount in each water supply operation mode.

(Second embodiment)
Next, the operation of the second embodiment of the present invention will be described with reference to the flowchart shown in FIG. 5 and the timing chart shown in FIG. This embodiment is different from the first embodiment described above only in the operation of the accumulated water forming step, and the operations in the other steps and the basic configuration of the apparatus are the same. That is, in the accumulated water forming step of the first embodiment, the switching from the first water supply operation mode to the second water supply operation mode is performed in the time t1 which is a predetermined time. Is different from the point that the second water supply operation mode is terminated based on the water level measurement result. Therefore, the following description will be focused on the process of forming the pool water of the bowl water, and other descriptions will be omitted as appropriate.

  In this embodiment, when the user presses a toilet cleaning switch (not shown), the process proceeds in the same manner as in the first embodiment until the end of the filth discharge process. Thereafter, the reservoir water forming process is started and bowl water supply by the first water supply means is started. At the same time (S56), the on-off valve 9a and the on-off valve 9b are opened, and sensing of the sensor 8 for confirming the water level in the bowl is started (S57). From the sensor output value B and the output value difference C (C = B−A) between the sensor output value A of the calibration tube 6a confirmed in the bowl cleaning process, the stored water level of the bowl in the stored water forming process is calculated. When the water level (h1) that is expected to be the switching water level from the sensor output value difference C is observed (S58), a closing instruction is sent from the control unit to the on-off valve 9c, and the on-off valve 9c. Is closed and bowl water supply is stopped (S59).

  After the opening / closing valve 9c is closed, when the predetermined t2 time obtained as the time when the water supply by the first water supply means is completely stopped and the wave of the bowl surface is settled (S60), the stored water level is obtained again. (S61) It is confirmed whether it is a predetermined switching water level (H1) (S62). If the accumulated water level is not within the allowable range of the switching water level, abnormal processing such as regenerating the accumulated water process is performed after the accumulated water is once produced (S91).

  When the stored water level is within the allowable range of the switching water level, a calibration curve that is the relational expression between the stored water level difference (the difference between the calibration tube water level and the stored water level) and the stored water level. Based on the above, the amount of stored water corresponding to the difference between the water level of the bowl 1 and the target water level obtained at this time is obtained as an additional water supply amount, and the obtained additional water supply amount and the second water supply to be used next time are obtained. Based on the instantaneous supply capability of the means, a valve opening time t3 of the on-off valve 9e necessary to reach the target water level is calculated (S63).

  When the valve opening time t3 is obtained, the opening / closing valve 9b is closed and the opening / closing valve 9e is opened, and the cleaning water in the tank 21 is discharged from the water discharge port 16 via the jet port connection path 15a and the trap water supply path 5. Supplying into the bowl 1 and the zett water supply by the second water supply means are started (S64).

When a predetermined time t3 has elapsed since the start of water supply by the second water supply means (S65), the on-off valve 9b is opened and the on-off valve 9e is closed to stop water supply (S66), and the water level of the accumulated water is measured by the sensor 8. (S67). Next, the water level difference between the measured stored water level (h2) and the target water level (H2) is obtained and checked to see if it is within a predetermined range (S68).
Here, the predetermined time t3 is obtained in advance as a time that does not exceed the target water level even if various variations that affect the instantaneous flow rate of each element constituting the second water supply means are considered to the maximum. use.

  Here, if the determined water level difference is within the predetermined range, it is determined that the target water level has been reached and all toilet flushing operations are completed, but the determined water level difference is outside the predetermined range and the target water level is exceeded. When the water level is low, the water replenishment operation described below is performed.

  That is, using the calibration curve which is a relational expression obtained in advance from the obtained water level difference, the amount of stored water corresponding to this water level difference is obtained as the additional water supply amount, and this additional water supply amount and the moment of the second water supply means An additional water supply time t5 required for additional water supply is determined from the flow rate (S69). Next, the on-off valve 9b is closed, the on-off valve 9e is opened, and the water supply by the second water supply means is resumed (S70) and continues until the additional water supply time t5 elapses (S71). Thereafter, the on-off valve 9b is opened and the on-off valve 9e is closed, and the water level of the accumulated water is again measured by the sensor 8 (S67), and the difference in water level from the target water level is confirmed again (S68). After repeating this series of operations until the water level difference falls within a predetermined range, when the stored water level reaches the target water level, the bowl water forming process is completed, and all toilet flushing operations are completed.

  In the present embodiment, in the first water supply operation mode operation for forming the switching water level, since the stop control of the operation of the water supply means (first water supply supply means) to be used is performed according to the stored water level, the individual of the sectional area of the bowl The variation in time is canceled and only the operation variation of the water supply means is performed, and the formation variation of the switching water level formed by the first water supply operation mode can be reduced. As a result, it is possible to set the switching water level closer to the target water level compared to the case of the first embodiment in which the stop control of the operation of the water supply means (first water supply means) in the first water supply operation mode is performed in time. It becomes possible. In other words, when the supply ratio in the first water supply operation mode having a large water supply capacity in the stored water formation process can be increased, the formation time of the target water level is shortened and the required time for forming the stored water is limited. However, it is possible to set the target water level at a higher water level.

  Further, with respect to the target water level, the stored water level formed in the second water supply operation mode is measured to check whether it is the target water level. If the target water level is not within the predetermined allowable range, the water supply in the second water supply operation mode is performed again. Since the water replenishment function is provided, the variation in the bowl cross-sectional area and the variation in the instantaneous flow rate of the water supply means used in the first water supply operation mode can be eliminated, and the target water level can be set more accurately. become able to.

  Further, in the second water supply operation mode for forming the water level of the stored water in the bowl, water is supplied in a water supply operation mode with a small instantaneous flow rate using the jet water discharge port 16 provided at the bottom of the bowl below the switching water level as the discharge port. In addition, it is possible to suppress the spilled water associated with the water supply. Therefore, the water level measurement by the pressure sensor 8 can be performed with higher accuracy, and as a result, the target water level of the bowl can be formed with higher accuracy.

(Third embodiment)
Next, the formation of the target water level in the bowl water formation process in the third embodiment of the present invention will be described. This embodiment differs from the first and second embodiments described so far in part in the water channel structure related to the accumulated water formation process and the operation thereof, but is related to other bowl cleaning processes and filth discharge processes. The configuration is the same and the operation is also the same. Therefore, the water channel configuration and the operation related to the accumulated water forming step will be described below with reference to FIGS. 7, 8, and 9.

  FIG. 7 is a channel configuration diagram showing the configuration of the channel system of the present embodiment. In the first embodiment and the second embodiment described so far, the jet connection path 15a from the water supply tank 21 is connected to the jet water supply path 5, and the water supply in the second water supply operation mode is discharged from the jet outlet 16. In the present embodiment, a dedicated water outlet 17 opened at the bottom of the bowl 1 is connected to the water supply tank 21 via the bowl connecting path 17a, and the water outlet 17 is connected to the water supply operation mode in the second water supply operation mode. It is configured to supply water. In the first embodiment and the second embodiment, the measurement flow path 7 for measuring the water level by the pressure sensor 8 is connected to the jet water supply path 5 through the connection path 15a. The measurement channel 7 is directly connected to the jet water supply channel 5.

  By configuring in this way, in the first and second embodiments, the water supply in the second water supply operation mode and the water level measurement by the pressure sensor 8 share part of the flow path. However, in this embodiment, both operations can be performed in parallel. That is, it is possible to supply water in the second water supply operation mode while measuring and monitoring the water level in the bowl.

The operation of the present embodiment will be described using the operation flowchart shown in FIG. 8 and the operation timing chart shown in FIG. The vertical axis in FIG. 9 shows the operation of each element constituting the water supply means, and the instantaneous flow rate and bowl water level of each flow path as a result, and the horizontal axis shows the elapsed time. Note that this embodiment differs from the first embodiment and the second embodiment described above only in the operation of the stored water formation step, and the operations in the other steps are the same. Therefore, the following description will be made with a focus on the process of forming water in the bowl, and other descriptions will be omitted as appropriate.

  In this embodiment, when the user presses a toilet cleaning switch (not shown), the process proceeds in the same manner as in the first embodiment and the first embodiment until the end of the waste discharging process. Bowl water supply is started (T16).

  After a lapse of t1 time from the transition to the accumulated water forming step (T17), a closing signal is sent from the control unit to the on-off valve 9c, and an opening signal is sent to the on-off valve 18a, and the water supply stopping operation of the first water supply means is performed. At the same time, sensing of the sensor 8 for confirming the water level in the bowl is started (T18). Thereafter, when the water supply by the first water supply means is completely stopped and t2 time obtained by an experiment in advance that the spilled water in the bowl 1 has stopped (T19) has elapsed (T19), the output value of the sensor 8 is monitored. (T20), the output value B of the sensor 8 at that time is read, and the output value with the output value A of the sensor 8 when the calibration tube 6a is full is confirmed in the bowl cleaning process. From the difference C (C = B−A), the water level in the bowl at this time is calculated (T21). In this case, if the stability of the output value of the sensor 8 is not recognized at the time when the time t2 has elapsed, it is determined that there is some abnormality and appropriate abnormality countermeasures such as notification to that effect are performed (T41).

  Next, the on-off valve 18b is opened, and water supply in the second water supply capacity mode in which water in the water supply tank 21 is supplied into the bowl 1 from the spout 17 through the bowl communication path 17a is started (T22). At the same time, measurement of the stored water level by the sensor 8 is also started (T23). This water supply and measurement is continued until the stored water level falls within a predetermined range of the target water level (T24), and when the stored water level becomes a water level (h2) that is lower than the target water level (H2) by a predetermined amount, the control unit opens / closes the valve 18b. A closing signal is sent to and valve closing is started. Thereafter, the on-off valve 18b is completely closed, the water supply from the water supply tank 21 is stopped (T25), the stored water level becomes the target water level (H2), and all toilet flushing operations are completed.

  In this embodiment, since the water supply level in the second water supply operation mode is controlled by directly measuring the water level in the bowl, the variation in the bowl cross-sectional area among individuals and the reproduction of the water supply rate of the second water supply means are reproduced. Sex and inter-individual variation can be eliminated, and the target water level can be set more accurately.

  Next, the target water level change of the present embodiment used in the first to third embodiments described so far will be described with reference to the external view of the target water level change dial in FIG. The target water level change dial 19 corresponds to the stored water level (target water level) of the bowl formed in the stored water forming step, and as shown in the drawing, the range of −30 mm to +30 mm at intervals of 5 mm around the scale 0 and MAX The scale of MIN is attached, and the water level of the 1st part of the bowl can be adjusted within this range. Here, the stored water level corresponding to the scale 0 serving as the reference water level in the water level setting range is a water level 50 mm above the lowest sealed water level (sealing depth 50 mm) from the lowest sealed water level at which the trap port 28 in the toilet bowl is sealed. Is set. This conforms to the standard of a minimum sealing depth of 50 mm or more for the sewage pipe connection device described in the Building Standards Act.

  When the setting by the target water level change dial 19 is the MAX position, the water level to be formed is the overflow water level of the toilet in which the sealed water depth that is the depth from the lowest water level to the water level is the maximum. Designed to. When this setting is selected, the second water supply means is not used in the accumulated water formation step, and the amount of water supply that exceeds the overflow water level of the bowl only by the operation in the first water supply operation mode by the water supply of the first water supply means. As a result, an excessive amount of water overflows into the sewage pipe, and the accumulated water level is formed at the overflow water level.

  Further, in the case of the MIN position, the point that the accumulated water level is formed only by the operation in the first water supply operation mode by the water supply of the first water supply means is the same as in the case of the MAX position. In consideration of variations in the amount of water supplied by the water supply means, the water level is designed to be equal to or higher than the minimum sealed water level and to the minimum sealed depth. That is, in the operation in the first water supply operation mode, a valve closing signal is sent to the on-off valve 9c at the sealing water level, and the valve is closed to stop water supply to the bowl. In this case, the water level in the bowl becomes an arbitrary water level equal to or higher than the sealed water level due to variations in the delay time from when the on-off valve 9c receives the valve closing signal until the valve channel is actually completely closed.

  In the target water level selection described above, when the range of -30 mm to 0 or the MIN position is selected, the water level in the bowl is below the reference water level (sealing depth 50 mm), and after a predetermined time has passed, the toilet is washed once After the operation is performed and the water stored in the bowl is discharged, a standby water level returning operation is performed in which the water level in the bowl is changed to a predetermined standby water level that is equal to or higher than the reference water level during standby.

  As described above, when the specified water level is the reference water level (sealing depth 50 mm) or less, toilet cleaning is automatically performed to change the water level of the bowl to a reference water level or higher when a predetermined time has elapsed after use. In addition, the structure is designed with consideration given to hygiene.

Similarly, when the water level in the bowl has decreased below the reference water level (sealing depth 50 mm) during standby for a reason, the toilet bowl is once cleaned after a predetermined time. A standby water level recovery operation is performed to return the stored water level to the designated water level at the start of standby.

  As described above, the setting of the stored water level is easy to use because the target water level is directly designated by the target water level change dial 19, and in particular in the second and third embodiments, it corresponds to the designated water level. Since the sensor output value to be controlled is controlled as the control target of the water level control unit in the second water supply operation mode, it is actually formed as compared with the case where the target water level is indirectly formed by controlling the supply amount and the supply time. Variations in the stored water level can be reduced. Moreover, since the target water level is changed in a stepped manner, the reproducibility of the target water level setting is good.

  In the first to third embodiments described so far, the first water supply means has been described on the premise of a water supply direct pressure type water supply system. However, as a modified example, a tank type water supply system can be similarly realized. That is, a configuration in which the constant flow valve 20a of the first water supply means in the first to third embodiments is replaced with a water supply tank and the tank discharge amount is controlled to a water supply amount corresponding to the switching water level.

  However, in this case, if the opening / closing time of the ball tap is used as the tank discharge amount control target with the opening / closing valve 9c as the tank discharge control target, the opening / closing time of the ball tap has a large variation, so that the tank discharge amount also varies. There is a concern that the settable range of the water level becomes smaller. Therefore, when adopting a ball tap mechanism, it can be said that it is preferable to use a configuration in which the volume of water stored in the tank is managed by a water level sensor or the like to discharge the entire amount as discharge control.

  Also, in a general flush toilet tank-type water supply system, after draining filth with the washing water in the tank, the washing water (refill water) is poured into the tank and bowl until the washing water in the tank is full. A flow path is provided. Therefore, as a further modification of the above-described modification of the present embodiment, an opening / closing valve corresponding to the function of the opening / closing valve 9a and the opening / closing valve 9e in the present embodiment is provided in the flow path of the refill water supplied into the bowl. This makes it possible to control the water level in the second water supply operation mode of the water level in the bowl. By comprising in this way, it becomes unnecessary to provide a tank in a 2nd water supply means, and it can be said that it is the best structure in a tank type water supply system.

  Further, the water supply operation mode used in this embodiment is the first water supply operation mode and the second water supply operation mode that are used while the supply capacities (instantaneous supply amounts) of the first water supply supply means and the second water supply supply means are respectively fixed. Although there are two types, a mode in which a larger number of water supply operation modes are used and sequentially switched from the largest water supply operation mode to a smaller water supply operation mode is also conceivable. By doing so, the target water level can be formed with higher accuracy in a shorter time.

  In addition, when using a plurality of water supply operation modes in this way, cleaning water supply means having different instantaneous flow rates for the number of water supply operation modes to be used may be prepared as in this embodiment, but any one of them The instantaneous flow rate of the cleaning water supply means may be switched to a plurality of stages, and one cleaning water supply means may be configured to assume a plurality of water supply operation modes.

  2 shows an example in which three types of water supply operation modes having different instantaneous flow rates are used. The instantaneous flow rate in the second water supply operation mode is changed from 10 L / min to 1.5 L / min in the course of the water supply time. It shows the relationship between elapsed time and water level when changed.

In this case, in the present embodiment, the second water supply means used in the second water supply operation mode uses the head difference between the water level of the water supply tank 21 and the stored water level of the bowl 1 part to supply cleaning water into the bowl 1 part. However, the structure which has three types of water supply operation modes by setting it as the structure which arrange | positions the pump in the middle of the jet opening connection path 15a, and supplies the instantaneous flow rate in a 2nd water supply means by the instantaneous flow rate which increased only the pump capability. It is also possible.

  In this case, the target water level can be set more accurately by reducing the instantaneous flow rate immediately before the completion of the water supply operation of the second water supply means for determining the final position of the water level in the bowl.

  Further, in the first to third embodiments described so far, a calibration curve for obtaining a relation between an arbitrary water level and the amount of accumulated water is used as a relational expression between the bowl water level and the amount of accumulated water used for water level control. However, in the present invention, in place of such a calibration curve, a correspondence equation between the sensor output value and the amount of accumulated water or a correspondence equation between the sensor output value and the operation time of each water supply operation mode is used indirectly. It also includes using the relational expression between the bowl water level and the amount of stored water.

  Furthermore, in the first to third embodiments described so far, the first water supply operation mode is set to the end of the water supply only by the first water supply means, but as a modified example, the water supply end by the first water supply means is ended. It is also conceivable that the first water supply operation mode is started from the start of the water supply by the second water supply means until the end of the water supply of the first water supply means, and then the second water supply operation mode. Specifically, instead of the flow path switching valve 12, an on-off valve is provided in each of the flow paths of the first water supply means and the second water supply means so that they can be controlled independently of each other, or instead of the flow path switching valve 12. In addition, a rotary valve having an opening capable of supplying water to both water supply means simultaneously is used. In this mode, the instantaneous supply amount in the first water supply operation mode can be increased with the water supply capacity of the water supply source as a limit, so that the water storage time can be shortened, and when the switching water level is set to be higher than the sealed water level, The sealing time is shortened and the backflow of sewage pipe odor is reduced.

(Fourth embodiment)
Hereinafter, the fourth embodiment of the present invention will be described in detail with reference to FIG. 11, FIG. 12, and FIG. The flush toilet of this embodiment has a stored water amount calculating means for obtaining the amount of stored water from the water level measurement value measured by the bowl water level measuring means, and after the target water level is formed, the amount of change in the stored water level before and after urination is measured. Measure and calculate at least the amount of urine excreted by the user in the bowl.

  FIG. 11 is a block diagram showing the configuration of the water channel system in the fourth embodiment, and FIG. 12 is a graph showing the relationship between the amount of discharged water discharged from the overflow water level by the pump to the sensor output value difference C in the third embodiment. FIG. 13 is a timing chart showing the operation of each component during urine volume measurement in the fourth embodiment.

  The stored water amount calculation means branches from the jet port connection path 15a, and sucks the flow path 24 for sucking the water in the bowl 1, and the suction pump that can suck the opening / closing valve 9f and the correct volume of water in the middle of the suction flow path 24. The urine output is calculated from the bowl shape confirmation means having 25, the relationship between the amount of accumulated water obtained by the bowl shape confirmation means and the sensor output value difference C, and the sensor output value difference C of the bowl water level measurement means before and after urination. And calculating means incorporated in the control unit.

  In this embodiment, in order to eliminate the variation in the bowl shape of the flush toilet and the variation in the relationship between the amount of accumulated water and the amount of accumulated water due to the construction inclination of the flush toilet at the time of construction, in this embodiment, The relationship with the amount of water is obtained and stored as a correction curve. First, after constructing the flush toilet, water supply to all the flow paths and water supply for filling the calibration pipe 6a are performed to release air from the flow path piping. Next, water is supplied until the water level in the bowl 1 reaches the overflow water level, and all water supply operations are stopped once.

  At this stage, the calibration tube 6a is full of water, and this water head pressure is recorded as the output value A of the sensor 8. Thereafter, the on-off valve 9a, the on-off valve 9b, and the on-off valve 9f are opened, and the suction pump 25 is operated to discharge a certain amount of water in the bowl 1. The output value difference C between the sensor output value B and the sensor output value A at the time when the discharge is completed is recorded. This series of operations is repeated a plurality of times until near the sealing water level, and the on-off valve 9a, on-off valve 9b, and on-off valve 9f are closed.

  From the plurality of sensor output value differences C thus recorded and the amount of discharged water estimated from the amount of water absorbed by the suction pump 25, the relationship between the amount of discharged water and the sensor output value difference C as shown in FIG. A certain correction curve is obtained. In this case, since the amount of water stored in the bowl 1 varies due to the surface tension of the stored water near the overflow water level, the sensor output value difference C is not measured there.

  After the correction curve is created, toilet flushing is performed in the same water supply sequence as in the first or second embodiment, and the bowl water level is set to the measurement start water level that is the water level at the start of measurement. Next, when the user presses the measurement start SW, a measurement preparation process for calibrating the output of the sensor is started. That is, the on-off valve 9b and the on-off valve 9e are opened, and the cleaning water in the water supply tank 21 is guided to the calibration pipe unit 6 to fill the calibration pipe 6a. Thereafter, the on-off valve 9b and the on-off valve 9e are closed, and the sensor output value A1 of the calibration pipe water level is recorded. When the recording is completed, the on-off valve 9a and the on-off valve 9b are opened, the output value difference C1 between the bowl water level sensor output value B1 and the calibration tube water level sensor output value A1 before urination is recorded, and the measurement preparation operation is finished. To do.

  After completion of the measurement preparation operation, pressure measurement by the sensor 8 is started, and the user starts urination in the bowl 1. When the user presses the measurement end SW, the output value difference C2 between the sensor output value B2 and the calibration tube sensor output value A at that time is recorded. Thereafter, the on-off valve 9a and the on-off valve 9b are closed, and the urination amount calculated by the control unit is displayed by the recorded C1 value and C2 value and the above-described correction curve, and the measurement process is completed. During the measurement, the on-off valve 9a and the on-off valve 9b are opened, the sensor output value difference C is always sampled, and the urine flow rate (urination rate) can also be measured.

  When the toilet cleaning SW is pressed after the measurement process is completed, the toilet water level in the bowl 1 is set to the measurement start water level before the start of measurement after the same toilet cleaning as in the first embodiment. In this case, when the measurement start SW is pushed again within a predetermined time after the toilet cleaning is completed, the water level in the bowl 1 part at that time is confirmed as the measurement start water level, and the sensor output value is confirmed with the calibration tube 6a described above. The sensor calibration operation to be performed is omitted, and the measurement process is immediately started.

  In addition, here, the measurement start water level of one part of the bowl is set as an operation similar to a normal toilet flushing operation, so that the subject's single urination volume is measured. (Distance from lower limit of sealing water) The water level is 50 mm or more. As a modification of the present embodiment, when a total amount measurement SW is separately provided and the SW is pressed, the water level of the bowl (target water level) from the sealed water level to 20 mm or less from the sealed water level after cleaning the toilet once. By incorporating a measurement range expansion mode that is reset to the range, it is possible to measure the total amount of urination of the subject per day.

  The maximum urine volume that can be measured is determined by the bowl volume between the measurement start water level and the overflow water level (about 80 mm) in one part of the bowl before measurement. Since the maximum urine volume also changes, the maximum measurable urine volume that can be adopted as a product specification has to be a minimum value considering variation. Therefore, according to the present invention in which the water level in the bowl 1 part can be set with high accuracy, the variation in the water level in the bowl 1 part before the measurement can be reduced. A urine measuring toilet can be realized.

It is a waterway lineblock diagram showing composition of a waterway system in the 1st and 2nd examples. It is a figure which shows the relationship between the elapsed time of the stored water formation process in 1st Example, and the stored water level of a bowl. It is a flowchart which shows the operation | movement order of each part of a waterway system in 1st Example. It is a timing chart which shows the operation timing of each part of a channel system in the 1st example, the instantaneous flow rate of each channel, and a bowl water level change. It is a flowchart which shows the operation | movement order of each part of a waterway system in 2nd Example. It is a timing chart which shows the operation timing of each part of waterway system in the 2nd example, and the change of instantaneous flow rate of each flow path, and bowl water level. It is a waterway lineblock diagram showing composition of a waterway system in the 3rd example. It is a flowchart which shows the operation | movement order of each part of a waterway system in 3rd Example. It is a timing chart which shows the operation timing of each part of waterway system in the 3rd example, and the change of instantaneous flow rate of each flow path, and bowl water level. It is an external view of the target water level change dial in the first to third embodiments. It is a waterway block diagram which shows the structure of the waterway system in 4th Example. It is a graph which shows the relationship of the amount of discharged water-sensor output value difference C in 4th Example. It is a timing chart which shows the operation timing of the component at the time of the urine volume measurement in 4th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 .... Bowl 2 .... Trap 3 .... Drainage socket 4 .... Bowl water supply channel 5 .... Zet water supply channel 6 .... Calibration tube unit 6a ... Calibration tube 7 ··· Measurement flow path 8 ··· Pressure sensor 9a · On-off valve 9b · On-off valve 9c · On-off valve 9d · On-off valve 9e · On-off valve 9f · On-off valve 9g ... Open / close valve 10 ... Second drainage channel 11 ... First supply channel
12 ... Flow path switching valve 13 ... Water inlet port 14a ... Water outlet port 14b ... Water outlet port 15 ... Second supply channel 15a ... Jet port connection path 16 ... Zet spout 17 ...・ Water outlet 17a ・ ・ Bowl connection 18a ・ ・ Open / close valve 18b ・ ・ Open / close valve 19 ・ ・ ・ Target water level change dial 20a ・ ・ Constant flow valve 21 ・ ・ ・ Water supply tank 22a ・ ・ Water level sensor 22b ・ ・ Water level sensor 23 ... Overflow pipe 24 ... Suction flow path 25 ... Suction pump 26 ... Fixed orifice 27 ... Rim spouting port 28 ... Trap port 51 ... Toilet bowl

Claims (11)

A bowl for receiving the excrement of a user, a trap for communicating in the toilet with the bowl and the sewer pipe, and a water supply means for supplying water into the bowl A flush toilet having a reservoir water forming step in which the water level is formed by the water supply means at an arbitrary target water level below the overflow water level, which is the water level at which the reservoir water overflows the sewer pipe,
The water supply means has a bowl water level measuring means for measuring the bowl water level of the stored water and a plurality of water supply operation modes having different instantaneous supply capacities, and the water supply to the bowl in the stored water forming step is switched to a predetermined level. Up to the water level, the first water supply operation mode having the largest instantaneous supply capability among the plurality of water supply operation modes is performed, and then the instantaneous supply capability is determined based on the water level measurement result of the bowl water level measurement means. A flush toilet characterized by forming a stored water level at the target water level by performing in a second water supply operation mode smaller than the operation mode.   The flush toilet according to claim 1, wherein the switching water level is set to be equal to or higher than a sealed water level that is a minimum water level at which a trap port opened in the bowl of the toilet is completely submerged.   The flush toilet according to claim 1 or 2, wherein the water supply operation up to the switching water level in the first water supply operation mode is stopped when the bowl water level measuring means detects a predetermined closed water level.   The flush toilet according to claim 1 or 2, wherein the water supply operation up to the switching water level in the first water supply operation mode is stopped when a predetermined closing time elapses from the start of water supply.   A relational expression for determining the correspondence between the bowl water level and the amount of stored water, and the amount of stored water corresponding to the water level difference between the water level at the switching water level and the target water level formed by the first water supply operation mode. The flush toilet according to any one of claims 1 to 4, wherein water is supplied in the second water supply operation mode using the obtained amount of stored water as an additional water supply amount.   The water supply operation up to the target water level in the second water supply operation mode is stopped when the bowl water level measuring means detects a predetermined closed water level set at a water level near the target water level. The flush toilet bowl of any one of thru | or 4.   When the water level difference between the formed water level and the target water level exceeds a predetermined range after completion of the water supply operation in the stored water formation step, the water supply operation and the stored water level measurement in the second water supply operation mode are performed. The flush toilet according to any one of claims 1 to 6, further comprising a water replenishing step that is repeated until the difference falls within a predetermined range.   The flush toilet according to any one of claims 1 to 7, wherein the water supply means includes instantaneous flow rate changing means for reducing an instantaneous flow rate with an elapsed time in a water supply operation in the second water supply operation mode.   The flush toilet according to any one of claims 1 to 8, wherein the water supply means supplies water to the bowl from a water discharge port provided below the switching water level when supplying water in the second water supply operation mode. .   The flush toilet according to any one of claims 1 to 9, wherein the water supply means includes target water level changing means capable of changing the target water level. The apparatus has a stored water amount calculating means for obtaining the amount of stored water from the stored water level of the bowl, and after the formation of the target water level, the user can change the stored water level by urination measured by the bowl water level measuring means. The flush toilet according to any one of claims 1 to 10, wherein urination information including at least the amount of urine excreted in the urine is obtained.

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