JP2016031008A - Water closet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save water, and to restrain reduction in washing performance and a variation in the sealing water depth.SOLUTION: A water closet on the embodiment comprises a toilet bowl body, a water discharge quantity control part and a state detection part. The toilet bowl body comprises a conduit and a bowl part connected to the conduit and forming a rim water discharge port and a jet water discharge port. The state detection part detects at least any state of the conduit and the jet water discharge port. The water discharge quantity control part changes the distribution ratio of a jet water discharge quantity and a rim water discharge quantity after finishing jet water discharge, while maintaining the sum total of the rim water discharge quantity and the jet water discharge quantity constant based on a detection result detected by the state detection part.SELECTED DRAWING: Figure 2

Description

  The disclosed embodiments relate to flush toilets.

  2. Description of the Related Art Conventionally, flush toilets including a water conduit through which wash water flows and a bowl portion connected to the water conduit are widely known. Also, in recent years, there are a rim spout that spouts wash water to the sewage receiving surface of the bowl portion to generate a swirl flow, and a jet spout spout that spouts wash water to the drain trap pipe and causes siphon action early. A flush toilet formed in the bowl has been proposed (see, for example, Patent Document 1).

  By the way, for example, when the water conduit and the jet outlet are formed of ceramics, the pressure loss of the water conduit or the like may vary from toilet to toilet due to manufacturing variations. Since the instantaneous flow rate of the cleaning water flowing through the water conduit is affected by the pressure loss described above, the instantaneous flow rate of the cleaning water changes when the pressure loss varies.

  Therefore, for example, when the instantaneous flow rate of the wash water flowing through the water conduit and the jet spout decreases, the amount of jet spout discharged from the jet spout within a predetermined time also decreases. As a result, there is a possibility that the washing performance of the flush toilet may be deteriorated such that the siphon action is difficult to be sustained. Therefore, in the flush toilet described above, when the pressure loss of the water conduit or the like is large, for example, the amount of jet water discharged per unit time is increased so that the washing performance is not impaired.

JP 2012-132167 A

  However, in recent flush toilets, water saving is required, and increasing the amount of jet water discharged as described above may increase the total amount of flush water used for toilet flushing, There was a problem that water saving was not enough.

  By the way, after the jet water discharge is completed, the sealing water in the drain trap pipe is replenished by the rim water discharge. In such a drain trap pipe, it is desirable that the sealing water depth after toilet flushing is constant. However, if the instantaneous flow rate of jet water discharge increases or decreases due to the pressure loss of the toilet as described above, the sealed water depth after jet water discharge changes, so the amount of rim water discharged after jet water discharge is constant. In such a case, the sealing depth after cleaning the toilet bowl may not be constant and may vary.

  One aspect of the embodiments has been made in view of the above, and an object thereof is to provide a flush toilet that can save water and can suppress deterioration in washing performance and variation in sealing depth. .

  A flush toilet according to one aspect of an embodiment includes a water conduit through which flush water flows, and a bowl that is connected to the water conduit and has a rim water spouting port for rim water spouting and a jet water spouting port for jet water spouting. A toilet body having a section, a rim water discharge amount of the wash water discharged from the rim water discharge port, and a water discharge amount control unit that controls a jet water discharge amount of the wash water discharged from the jet water discharge port, the water conduit, A state detection unit that detects at least one of the states of the jet water spouting port, and the water discharge amount control unit, based on a detection result detected by the state detection unit, the rim water discharge amount and the jet water discharge amount, The distribution ratio between the jet water discharge amount and the rim water discharge amount after completion of the jet water discharge is changed, while maintaining the sum of the above constant.

  As described above, since the distribution ratio between the jet water discharge amount and the rim water discharge amount after the jet water discharge is changed based on the state of the water conduit and the like, it is less susceptible to the influence of fluctuations in pressure loss of the water conduit and the like. Therefore, it is possible to suppress a decrease in cleaning performance. In addition, since the sum of the rim water discharge amount and the jet water discharge amount, that is, the total washing water amount is kept constant, the total washing water amount does not increase even when the distribution ratio is changed. , Can save water.

  Furthermore, for example, when the instantaneous flow rate of jet water discharge increases, the sealing depth of the drain trap pipe after jet water discharge becomes deep, so the distribution ratio can be changed so as to reduce the amount of rim water discharged after jet water discharge ends. It becomes possible. On the other hand, when the instantaneous flow rate of jet water discharge decreases, the sealing depth of the drain trap pipe after jet water discharge becomes shallow, so the distribution ratio can be changed to increase the rim water discharge amount after the jet water discharge ends. Become. Thereby, even if it is a case where the instantaneous flow volume of jet water spouting increases / decreases, the sealing depth of the drain trap pipe line after toilet flushing can be made constant, and variation can be suppressed.

  Further, the flush toilet includes a water storage tank for storing the cleaning water for jet water spouting, and a pump for pressurizing the water for cleaning the water storage tank and discharging water from the jet water spouting port. By measuring a water level lowering time until the water level in the water storage tank drops from a first water level to a second water level lower than the first water level by driving a pump, the water conduit and the jet water outlet are measured. It is characterized by detecting at least one of the states. Thereby, the state of a water conduit etc. can be detected easily.

  Further, the water discharge amount control unit adjusts the jet water discharge time and the rim water discharge time after the jet water discharge ends according to the changed distribution ratio, so that the jet water discharge amount and the jet water discharge are adjusted. The rim water discharge amount after the end is controlled. Thereby, it is possible to control the jet water discharge amount and the rim water discharge amount after completion of the jet water discharge, respectively, with a simple configuration.

  In addition, the water discharge amount control unit adjusts the jet water discharge time by the length of the blow period after the siphon action generated when the wash water is supplied from the jet water discharge port to the drain trap pipe. It is characterized by.

  If the jet water discharge time is adjusted by the length of the period during which the siphon action is occurring in the drain trap pipe, the siphon action may be affected and the cleaning performance may be reduced. On the other hand, the water discharge amount control unit adjusts the jet water discharge time by the length of the blow period after the end of the siphoning action, so that the siphoning action itself is not affected and the deterioration of the cleaning performance is further suppressed. can do.

  According to one aspect of the embodiment, water saving can be achieved, and a reduction in cleaning performance and variation in sealing depth can be suppressed.

FIG. 1 is an overall configuration diagram schematically showing a flush toilet according to the embodiment. FIG. 2 is a diagram illustrating a distribution example of the jet water discharge amount and the rear rim water discharge amount. FIG. 3 is a time chart showing the operation procedure of toilet bowl cleaning. FIG. 4 is a flowchart showing a processing procedure executed by the controller.

  Hereinafter, with reference to an accompanying drawing, an embodiment of a flush toilet which this application discloses is described in detail. In addition, this invention is not limited by embodiment shown below.

  FIG. 1 is an overall configuration diagram schematically showing a flush toilet according to the embodiment. As shown in FIG. 1, the flush toilet 1 includes a toilet body 2 and a water supply function unit 3 that supplies cleaning water to the toilet body 2.

  The toilet body 2 is formed of earthenware, and includes a water conduit 10, a bowl portion 11, and a drain trap pipe 12. In FIG. 1, for simplification of illustration, illustration of some members such as a toilet seat provided in the toilet body 2 and a cover covering the toilet seat is omitted. Moreover, in FIG. 1, although the floor-standing toilet body 2 was shown, it is not limited to this, A wall-hanging type may be sufficient.

  The water conduit 10 includes a rim-side water conduit 10a and a jet-side water conduit 10b. When toilet flushing is performed, the wash water supplied from the water supply function unit 3 flows through the rim-side water conduit 10a and the jet-side water conduit 10b.

  The bowl portion 11 is connected to the water conduit 10 and is formed in a bowl shape that can receive filth. Specifically, the bowl portion 11 includes a filth receiving surface 13 for receiving filth, a rim portion 14 formed on the upper edge of the filth receiving surface 13, a rim water spouting port 15, and a jet water spouting port 16.

  The rim spout 15 is opened on the inner peripheral surface 14a of the rim portion 14, and is connected to the rim-side water conduit 10a. As a result, the rim spout 15 discharges the cleaning water supplied from the rim-side water guide channel 10 a to the filth receiving surface 13 of the bowl portion 11 and causes a swirl flow on the filth receiving surface 13. In the present specification, the discharge of the wash water from the rim spout 15 may be referred to as “rim spout”.

  The jet spout 16 is provided at the bottom 13 a of the filth receiving surface 13 and is opened to face the drain trap pipe 12 side. Further, the jet water outlet 16 is connected to the jet-side water conduit 10b. Thereby, the jet spout 16 discharges the washing water supplied from the jet side conduit 10b to the drain trap pipe 12, and quickly fills the drain trap pipe 12 with the washing water, thereby enabling the siphon action early. To generate. In the present specification, the discharge of washing water from the jet water spouting port 16 may be referred to as “jet water spouting”.

  The drain trap pipe 12 includes an inlet portion 12a, a trap ascending portion 12b, and a trap descending portion 12c. The inlet portion 12 a is provided so as to be continuous with the bottom portion 13 a of the filth receiving surface 13, and allows the cleaning water from the bowl portion 11 to flow into the drain trap pipe 12. The trap raising portion 12b is formed so as to extend obliquely upward from the inlet portion 12a. The trap lowering part 12c is formed to extend downward from the trap raising part 12b.

  Further, a drain pipe 17 is connected to the lower end of the trap lowering portion 12c. Therefore, when toilet bowl cleaning is performed, the wash water in the bowl portion 11 is drained to the drain pipe 17 through the inlet portion 12a, the trap ascending portion 12b, and the trap descending portion 12c of the drain trap conduit 12.

  After toilet flushing is performed, flush water accumulates in the drain trap pipe 12 and the bowl portion 11. Here, the cleaning water accumulated in the drain trap pipe 12 and the like is referred to as “reserved water” and is indicated by a symbol W in FIG.

  As shown in FIG. 1, when the drain trap pipe 12 and the like are filled with the stored water W, the stored water W functions as a sealed water, and the odor from the drain pipe 17 flows back to the bowl part 11 side. To prevent. In addition, the depth from the water surface of the stored water W to the upper end 12a1 of the inlet 12a of the drain trap pipe 12 is referred to as “sealed depth”, and is indicated by the symbol H.

  Here, the rim water discharge and jet water discharge described above will be described. When toilet bowl cleaning is performed, rim water discharge is first performed to clean the filth receiving surface 13 of the bowl portion 11. Hereinafter, such rim water discharge may be referred to as “front rim water discharge”, and toilet flushing using the front rim water discharge may be referred to as “front rim water discharge”. In addition, although the front rim water discharge is continued until jet water discharge is complete | finished, in this specification, the rim water discharge before the start of jet water discharge may be called front rim water discharge for convenience of understanding.

  Subsequently, jet water discharge is performed in parallel with the front rim water discharge. As a result, a siphon action is generated in the drain trap pipe 12 as described above, and the washed water and the accumulated water W discharged are discharged from the drain trap pipe 12 to the drain pipe 17 together with the filth. Hereinafter, toilet flushing with jet water spouting may be referred to as “jet washing”.

  Even after the jet water discharge ends, the rim water discharge continues. The cleaning water discharged from the rim water spouting port 15 again cleans the filth receiving surface 13 of the bowl portion 11 and flows into the drain trap pipe 12. Thereby, the stored water W of the drain trap pipe 12 is replenished, the water level rises, and toilet flushing is completed. Hereinafter, the rim water spouting after the jet water spouting is referred to as “rear rim water spouting”, and toilet cleaning by the rear rim water spouting may be referred to as “rear rim cleaning”.

  By the way, when the toilet body 2 is formed of earthenware, specifically, for example, when the jet side conduit 10b and the jet spout 16 are formed of earthenware, the pressure of the jet side conduit 10b or the like due to manufacturing variation or the like. Loss can vary from toilet to toilet. The instantaneous flow rate of the cleaning water in the jet-side water conduit 10b and the like changes with the fluctuation of the pressure loss described above.

  Therefore, for example, when the instantaneous flow rate of the wash water in the jet side conduit, etc. is reduced, the jet water discharge amount within a predetermined time may be reduced and the washing performance of the flush toilet may be lowered. Therefore, in the conventional flush toilet, when the pressure loss of the jet side conduit is large, for example, the amount of jet water discharged per unit time is increased so that the washing performance is not impaired. .

  However, recent flush toilets are required to save water, and if the jet water discharge amount is increased as described above, the total wash water amount may increase, and water saving is not sufficient. It was happening.

  Furthermore, in the drain trap pipe, it is desirable that the sealing depth H after toilet flush is constant, but if the instantaneous flow rate of jet water discharge increases or decreases as described above, Sealing depth H changes. For this reason, when the rim water discharge amount after the jet water discharge is a constant water amount, the sealing depth H after toilet flushing may not be constant and may vary.

  Therefore, in the flush toilet 1 according to the embodiment, the state of the jet side conduit 10b and the jet water outlet 16 is detected, and the distribution ratio between the jet water discharge amount and the rear rim water discharge amount is changed based on the detection result. did. Thereby, while saving water, the fall of washing | cleaning performance and the dispersion | variation in the sealing depth H can be suppressed. Hereinafter, the configuration of the flush toilet 1 will be described in detail.

  The water supply function unit 3 includes a water supply channel 20, a water storage tank 21, a pump 22, and a controller 23.

  One end side of the water supply channel 20 is connected to a water supply source A such as a water pipe. The water supply channel 20 is provided with various instruments such as valves. Specifically, the water supply path 20 is provided with a stop cock 30, a strainer 31, a constant flow valve 32, a solenoid valve 33, and a switching valve 34 in order from the upstream side.

  The water supply path 20 is branched downstream of the switching valve 34 into a rim-side water supply path 35 that supplies cleaning water to the rim spout 15 and a tank-side water supply path 36 that supplies cleaning water to the water storage tank 21. The

  The stop cock 30 is an instrument for stopping the inflow of cleaning water from the water supply source A to the water supply channel 20, but is normally in an opened state. The strainer 31 removes foreign matters such as dust mixed in the cleaning water. The constant flow valve 32 adjusts the wash water introduced from the water supply source A to a predetermined flow rate or less.

  The electromagnetic valve 33 opens and closes in response to a control signal from the controller 23. The switching valve 34 operates in accordance with a control signal from the controller 23 and switches the cleaning water flow path between the rim-side water supply path 35 and the tank-side water supply path 36.

  The rim side water supply path 35 is connected to the rim side water conduit 10 a of the toilet body 2. Accordingly, the water supply source A is directly connected to the rim water discharge port 15, and thus the wash water is discharged from the rim water discharge port 15 by the water supply pressure of the water supply source A.

  Further, a rim-side vacuum breaker 37 is provided in the middle of the rim-side water supply path 35 to prevent a backflow from occurring from the rim water spouting port 15 when, for example, negative pressure is generated in the water-supply path 20.

  The tank side water supply path 36 is connected to the water storage tank 21. A tank-side vacuum breaker 38 is also provided in the middle of the tank-side water supply path 36 to prevent backflow from the water storage tank 21 when negative pressure is generated in the water-supply path 20, for example. When the washing water overflows from the rim side vacuum breaker 37 or the tank side vacuum breaker 38, the overflowing washing water flows into the water storage tank 21 through the return line 39.

  The water storage tank 21 stores cleaning water for jet water discharge. An upper float switch 40 and a lower float switch 41 are disposed inside the water storage tank 21.

  The upper float switch 40 is disposed in the water storage tank 21 at the first water level L1. Here, the first water level L1 is, for example, an initial water level before toilet bowl cleaning. The upper float switch 40 outputs an ON signal when the water level in the water storage tank 21 is at the first water level L1, and outputs an OFF signal when the water level is lower than the first water level L1. In the above description, the first water level L1 is the initial water level. However, the present invention is not limited to this. For example, any position lower than the initial water level may be used as the first water level L1.

  The lower float switch 41 is disposed in the water storage tank 21 at the second water level L2. The second water level L2 is set lower than the first water level L1. In addition, as will be described later, the jet water discharge is performed even after the water level in the water storage tank 21 has dropped below the second water level L2. Therefore, the second water level L2 is preferably set at a position separated from the bottom surface of the water storage tank 21 by a predetermined distance in order to secure the washing water for jet spouting after the water level has dropped below the second water level L2. .

  The lower float switch 41 outputs an off signal when the water level in the water storage tank 21 is equal to or higher than the second water level L2, and outputs an on signal when the water level is lower than the second water level L2. The on / off signals output from the float switches 40 and 41 are input to the controller 23.

  A pump-side water supply path 42 is connected to the water storage tank 21. One end of the pump-side water supply path 42 is disposed near the bottom surface of the water storage tank 21, and the other end is connected to the jet-side water conduit 10 b of the toilet body 2.

  The pump 22 is provided in the middle of the pump-side water supply path 42 and is driven according to a control signal from the controller 23. Therefore, when a control signal indicating driving is input, the pump 22 pressurizes the cleaning water in the water storage tank 21 and supplies the pressurized cleaning water to the jet water spouting port via the pump-side water supply path 42 and the jet-side water conduit 10b. Water is discharged from 16.

  The controller 23 controls the entire water supply function unit 3 and includes, for example, an arithmetic processing device (not shown) such as a CPU (Central Processing Unit) and a storage device (not shown) such as a RAM (Random Access Memory).

  Specifically, the controller 23 includes a water discharge amount control unit 50 and a state detection unit 51. The water discharge amount control unit 50 controls the opening / closing operation of the pump 22 and the electromagnetic valve 33, and the rim water discharge amount of the wash water discharged from the rim water discharge port 15 and the jet water discharge amount of the wash water discharged from the jet water discharge port 16. To control. The water discharge amount control unit 50 controls the rim water discharge amount and the jet water discharge amount based on the detection result of the state detection unit 51, which will be described later. The water discharge amount control unit 50 also controls the flow path switching operation in the switching valve 34.

  The state detection unit 51 detects the state of the water conduit 10, specifically, the jet-side water conduit 10 b and the jet water outlet 16. Here, the state of the jet side conduit 10b and the jet outlet 16 includes pressure loss of the jet side conduit 10b, the size (opening area) of the jet outlet 16, the cross-sectional area of the jet side conduit 10b, the shape, and the like. Various characteristics of the jet-side water conduit 10b and the like are included.

  Accordingly, the state detection unit 51 measures the water level lowering time T1 until the water level in the water storage tank 21 drops from the first water level L1 to the second water level L2 during jet water discharge. A state such as 10b is indirectly detected.

  Specifically, when jet water discharge is started and the water level in the water storage tank 21 is lower than the first water level L1 and an off signal is input from the upper float switch 40, the state detection unit 51 sets a built-in counter. Start it. Subsequently, when the water level in the water storage tank 21 falls below the second water level L2 and the ON signal is input from the lower float switch 41, the state detection unit 51 stops the counter. Thus, the state detection part 51 measures the water level fall time T1 with a counter.

  Here, when the amount of water from the first water level L1 to the second water level L2 in the water storage tank 21 is “basic jet water discharge amount Qb” (see FIG. 1), the above-described water level lowering time T1 is the basic jet water discharge amount. It can be said that this is the time required to jet the Qb wash water. For this reason, the state detection part 51 decided to detect the states of the jet side water conduit 10b etc. by the length of this water level fall time T1.

  Next, the state detection by the state detection unit 51 and the control of the rim water discharge amount and the jet water discharge amount by the water discharge amount control unit 50 will be described in detail with reference to FIG. FIG. 2 is a diagram illustrating a distribution example of the jet water discharge amount and the rear rim water discharge amount. FIG. 2 also shows the relationship between the water level lowering time T1 and the state of the jet-side water conduit 10b and the relationship between the state of the jet-side water conduit 10b and the rim water discharge amount and the jet water discharge amount.

  Hereinafter, it is expressed as “long / short” of the water level drop time T1 or “large / small” of the pressure loss. For example, the water level drop time of a plurality of flush toilets is measured through an experiment, and the average value of the measured values is calculated. When the reference value is used, it is used to mean “long / short” or “large / small” with respect to the reference value.

  As shown in FIG. 2, when the water level lowering time T1 is short, it can be said that the cleaning water of the basic jet water discharge amount Qb was jetted early, so the instantaneous flow rate of the cleaning water flowing through the jet side conduit 10b and the jet water outlet 16 There are many.

  When the instantaneous flow rate of the jet side conduit 10b or the like is large, for example, the size of the jet spout 16 is large, and the pressure loss of the jet side conduit 10b or the like is estimated to be small. Therefore, when the water level lowering time T1 is short, the state detection unit 51 detects that the state of the jet-side water conduit 10b and the like is a state where the pressure loss is small. In the above description, the size of the jet water outlet 16 is given as the reason why the instantaneous flow rate of the jet side conduit 10b and the like is large, but this is only an example, and for example, the shape of the jet side conduit 10b and the roughness of the channel wall Etc., the instantaneous flow rate may increase.

  On the other hand, when the water level lowering time T1 is long, it takes time for the basic jet water discharge amount Qb of the cleaning water to be jetted, so that it can be said that the instantaneous flow rate of the cleaning water in the jet side conduit 10b is small. When the instantaneous flow rate of the jet side conduit 10b or the like is small, for example, the size of the jet spout 16 is small and the pressure loss of the jet side conduit 10b or the like is estimated to be large. Therefore, when the water level lowering time T1 is long, the state detection unit 51 detects that the state of the jet-side water conduit 10b and the like is a state with a large pressure loss.

  Thus, the state detection part 51 measures the water level fall time T1, and detects the state of the jet side water conduit 10b etc. by the length of the measured water level fall time T1. Thereby, the state of the jet side water conduit 10b etc. can be detected easily.

  The water discharge amount control unit 50 controls the jet water discharge amount and the rear rim discharge amount based on the detection result of the state detection unit 51. First, control of the jet water discharge amount will be described.

  The jet water discharge is performed even after the cleaning water having the basic jet water discharge amount Qb is discharged from the jet water discharge port 16 and the water level in the water storage tank 21 is lowered from the second water level L2. That is, in the water storage tank 21, the wash water below the second water level L2 is also jetted.

  The water discharge amount control unit 50 controls the jet water discharge amount by increasing or decreasing the amount of the wash water below the second water level L2. Hereinafter, the amount of cleaning water adjusted by the water discharge amount control unit 50 is referred to as “adjusted jet water discharge amount Qc”. In FIG. 1, the third water level L3 indicates the water level at the time when the jet water discharge ends, and the above-described adjusted jet water discharge amount Qc is the water amount from the second water level L2 to the third water level L3. It is.

  The graph shown in FIG. 2 is a graph showing the distribution ratio of the front rim water discharge amount Qa, the jet water discharge amount Qjet, and the rear rim water discharge amount Qd with respect to the total cleaning water amount Qtotal. As shown in FIG. 2, the sum of the front rim water discharge amount Qa, the jet water discharge amount Qjet, and the rear rim water discharge amount Qd is the total washing water amount Qtotal. The jet water discharge amount Qjet is obtained by adding the adjusted jet water discharge amount Qc to the basic jet water discharge amount Qb.

  In FIG. 2, for convenience of explanation, reference values of the front rim water discharge amount Qa, the jet water discharge amount Qjet, and the rear rim water discharge amount Qd are shown in the upper stage, and “0” is added to the end of each water discharge amount. did. Further, “1” is added to the end of each water discharge amount when the water level drop time T1 is short, and “2” is attached to the end of each water discharge amount when the water level drop time T1 is long.

  Hereinafter, the expression “increase” or “decrease” in the jet water discharge amount Qjet is used to mean “increase” or “decrease” with respect to the reference jet water discharge amount Qjet0. Further, for convenience of understanding, it is assumed that the front rim water discharge amount Qa is constant regardless of the state detection result in the state detection unit 51.

  When the state detection unit 51 detects a state where the water level lowering time T1 is short and the pressure loss of the jet side conduit 10b or the like is small, the siphon action time due to jet water spouting is short, and the washing performance of the flush toilet 1 is low it is conceivable that. Accordingly, as shown in FIG. 2, the water discharge amount control unit 50 increases the adjusted jet water discharge amount Qc1 to increase the jet water discharge amount Qjet1, thereby maintaining the siphon action. Thereby, it can be made hard to receive the influence by the fluctuation | variation of the pressure loss of the jet side water conduit 10b etc., Therefore The fall of a cleaning performance can be suppressed.

  When the jet water discharge amount Qjet1 is increased, the water discharge amount control unit 50 decreases the rear rim water discharge amount Qd1 by the increased amount. That is, the water discharge amount control unit 50 changes the distribution ratio between the jet water discharge amount Qjet1 and the rear rim water discharge amount Qd1 while maintaining the sum of the rim water discharge amount Qa1 + Qd1 and the jet water discharge amount Qjet1 (total cleaning water amount Qtotal) constant. To do. Thereby, water-saving can be achieved and the dispersion | variation in the sealing depth H of the drain trap pipe 12 after toilet bowl washing | cleaning can be suppressed.

  That is, since the total cleaning water amount Qtotal is kept constant, water saving can be achieved even when the jet water discharge amount Qjet1 is increased. Further, when the jet water discharge amount Qjet1 is increased, the accumulated water W remaining in the drain trap pipe 12 after the siphon action ends increases, and the sealed water depth H after the jet water discharge ends becomes deep. Therefore, even if the rear rim water discharge amount Qd1 is decreased, the sealing depth H of the drain trap pipe 12 after toilet flushing can be made constant at a sufficient depth, and variations in the sealing depth H can be suppressed. .

  On the other hand, when the state detection unit 51 detects a state where the water level lowering time T1 is long and the pressure loss of the jet side conduit 10b or the like is large, the siphon action by the jet water spouting is maintained for a long time, and the flush toilet 1 The cleaning performance is considered high. Therefore, as shown in FIG. 2, the water discharge amount control unit 50 reduces the jet water discharge amount Qjet2 by reducing the adjusted jet water discharge amount Qc2. Even when the jet water discharge amount Qjet2 is decreased, the siphon action has already been sustained for a long time, so that the cleaning performance does not deteriorate.

  When the jet water discharge amount Qjet2 is decreased, the water discharge amount control unit 50 increases the rear rim water discharge amount Qd2 by the decreased amount. Thereby, water-saving can be achieved and the dispersion | variation in the sealing depth H of the drain trap pipe 12 after toilet bowl washing | cleaning can be suppressed.

  That is, since the total washing water amount Qtotal is kept constant, water saving can be achieved even when the rear rim water discharge amount Qd2 is increased. Further, when the jet water discharge amount Qjet2 is decreased, the siphon action is maintained for a long time, so that the remaining water W remaining in the drain trap pipe 12 after the siphon action ends is reduced, and the sealed water depth H after the jet water discharge ends is It becomes shallower.

  Therefore, by increasing the rear rim water discharge amount Qd2, it is possible to make the sealing depth H of the drain trap conduit 12 after toilet flushing constant at a sufficient depth, thereby suppressing variations in the sealing depth H. it can. The increase / decrease of the jet water discharge amount Qjet and the rear rim water discharge amount Qd is performed by adjusting the respective water discharge times, which will be described later.

  Next, the operation of toilet flushing of the flush toilet 1 will be specifically described with reference to FIG. FIG. 3 is a time chart showing the operation procedure of toilet bowl cleaning.

  As shown in FIG. 3, in a standby state before toilet flushing, the controller 23 operates the front rim when a toilet flushing switch (not shown) is operated by a user and a flushing instruction signal indicating a toilet flushing instruction is input at time t1. Start cleaning. Specifically, first, the water discharge amount control unit 50 switches the switching valve 34 from the rim side water supply path 35 side to the tank side water supply path 36 side.

  In the above, the front rim cleaning is started by a signal from the toilet cleaning switch, but the present invention is not limited to this. For example, an output signal from a human body detection sensor (not shown) provided in the toilet body 2 is used. Based on this, the pre-rim cleaning may be started.

  Next, the water discharge amount control unit 50 opens the electromagnetic valve 33 at time t <b> 2 and causes the flush water in the water supply passage 20 to flow into the switching valve 34. Thereby, the air accumulated in the water supply channel 20 is discharged into the water storage tank 21 through the tank-side water supply channel 36. In this way, by discharging the air in the water supply channel 20 in advance, it is possible to prevent air discharge noise, water splashing, and the like from occurring during rim water discharge.

  Next, the water discharge amount control unit 50 switches the switching valve 34 from the tank side water supply path 36 side to the rim side water supply path 35 side at time t3. As a result, cleaning water is discharged from the rim spout 15. The cleaning water discharged from the rim spout 15 flows while swirling on the filth receiving surface 13 of the bowl portion 11 to clean the filth receiving surface 13.

  Next, at time t4, the controller 23 starts jet cleaning. Specifically, first, the water discharge amount control unit 50 activates the pump 22. Thereby, the washing water pressurized by the pump 22 is discharged from the jet water outlet 16. As shown in FIG. 3, the electromagnetic valve 33 is opened during jet cleaning, and the switching valve 34 remains switched to the rim-side water supply channel 35 side. Done.

  In the jet cleaning, the rotational speed of the pump 22 is increased to a relatively low first rotational speed N1 by time t5, and the first rotational speed N1 is maintained until time t6. As described above, by relatively reducing the rotation speed immediately after the pump 22 is started, the air accumulated in the pump-side water supply passage 42 is rapidly discharged from the jet water spouting port 16 and an air discharge sound is generated. Can be prevented.

  At time t5, when the water level of the water storage tank 21 falls below the first water level L1, the state detection unit 51 receives an off signal from the upper float switch 40 and starts measuring the water level lowering time T1. In the above description, the timing at which the rotation speed of the pump 22 reaches the first rotation speed N1 and the timing at which the OFF signal is input from the upper float switch 40 are set to the same time t5. It is not always the same timing.

  Next, the water discharge amount control unit 50 increases the rotational speed of the pump 22 to a second rotational speed N2 higher than the first rotational speed N1 (time t7). The second rotation speed N2 is maintained from time t7 to time t8, which is a siphon activation period. As the rotational speed of the pump 22 increases, the cleaning water in the water storage tank 21 is discharged from the jet water outlet 16 at a large flow rate. Thereby, the inside of the drain trap pipe 12 is rapidly filled with the washing water, and the siphon action is started.

  Subsequently, the water discharge amount control unit 50 reduces the rotational speed of the pump 22 to a third rotational speed N3 that is higher than the first rotational speed N1 and lower than the second rotational speed N2 at time t8. The third rotation speed N3 is maintained until time t9, which is a siphon duration. As described above, when the rotational speed of the pump 22 is decreased, the amount of cleaning water discharged from the jet water spouting port 16 is decreased. However, the decreased amount of cleaning water is sufficient to maintain the siphon action. Therefore, the siphon action is sustained.

  In this way, the siphon action is maintained while reducing the amount of cleaning water discharged from the jet spout 16 during the siphon duration. As a result, the siphon action can be maintained for as long as possible while saving water by reducing the amount of cleaning water required for jet cleaning.

  Next, the water discharge amount control unit 50 lowers the rotation speed of the pump 22 to a fourth rotation speed N4 that is relatively low (time t10). The fourth rotation speed N4 is maintained until the jet water discharge ends. In FIG. 3, the first rotation speed N1 and the fourth rotation speed N4 are set to the same value. However, this is an example, and may be a different value.

  After time t10, the siphon action ends and the blow period starts. Here, for convenience of understanding, the period from time t10 to time t12 when jet water discharge ends is referred to as a blow period.

  During the blow period, the rotational speed of the pump 22 is set to a relatively low fourth rotational speed N4, so that the amount of cleaning water flowing into the drain trap pipe 12 is relatively small and the siphon action is activated again. Never happen. In the blow period, blow cleaning is performed in which the filth remaining in the bowl portion 11 and the drain trap pipe 12 is pushed out to the drain pipe 17 by jet water discharge.

  In the above description, the period from time t10 to time t12 is the blow period after the end of the siphon action, but the siphon action does not necessarily have to end at the time t10. However, it is preferable that the siphon action has been completed by time t11 to be described later.

  In the blow period, when the water level of the water storage tank 21 falls below the second water level L2 at time t11, the state detection unit 51 receives an ON signal from the lower float switch 41 and ends the measurement of the water level drop time T1. .

  Here, the water discharge amount control unit 50 cleans the adjusted jet water discharge time T2 and the rear rim water discharge amount Qd for jetting the cleaning water of the adjusted jet water discharge amount Qc based on the water level lowering time T1 measured by the state detection unit 51. A rim water discharge time T3 after the water is discharged to the rim is calculated.

  Specifically, the water discharge amount control unit 50 first changes the distribution ratio between the jet water discharge amount Qjet and the rear rim water discharge amount Qd based on the water level lowering time T1.

  For example, information indicating the relationship between the water level lowering time T1 and the distribution ratio is acquired in advance through experiments or the like, and the acquired information is stored in the storage device. Then, the water discharge amount control unit 50 obtains a distribution ratio between the jet water discharge amount Qjet such as “X: Y” and the rear rim water discharge amount Qd based on the measured water level lowering time T1 and the stored information. Note that the information described above is, for example, a table or an arithmetic expression that associates the water level lowering time T1 with the distribution ratio, but is not limited thereto. Alternatively, a program including the above information may be stored in a storage device, and the distribution ratio may be obtained according to the program.

  Next, the water discharge amount control unit 50 subtracts the basic jet water discharge amount Qb from the jet water discharge amount Qjet corresponding to the changed distribution ratio to obtain the adjusted jet water discharge amount Qc, and jets the wash water of the calculated adjusted jet water discharge amount Qc. An adjusted jet water discharge time T2 required for water discharge is calculated. Further, the water discharge amount control unit 50 calculates a post-rim water discharge time T3 required to discharge the post-rim water discharge amount Qd according to the changed distribution ratio.

  In the above description, the adjusted jet water discharge time T2 and the rear rim water discharge time T3 are calculated, but the present invention is not limited to this. That is, for example, information on the adjusted jet water discharge time T2 and the rear rim water discharge time T3 associated with the water level lowering time T1 is stored in advance in a storage device, and the information is read according to the measured water level lowering time T1. The adjusted jet water discharge time T2 or the like may be obtained directly.

  The water discharge amount control unit 50 continuously performs jet water discharge from time t11 to time t12 when the above-described adjusted jet water discharge time T2 elapses. In this way, the jet water discharge time (T1 + T2) is adjusted.

  Further, the water discharge amount control unit 50 adjusts the jet water discharge time by the length of the blow period. Here, if the jet water discharge time is adjusted by the length of the siphon duration during which the siphon action is occurring, the siphon action may be affected and the cleaning performance may be deteriorated. On the other hand, the water discharge amount control unit 50 adjusts the jet water discharge time by the length of the blow period after the siphon action ends, so that the siphon action itself is not affected and the cleaning performance is further reduced. Can be suppressed.

  Next, the water discharge amount control unit 50 stops the pump 22 at time t12 to end the jet cleaning, and starts the rear rim cleaning. Specifically, the water discharge amount control unit 50 performs rear rim water discharge from time t12 to time t13 when the above-described post rim water discharge time T3 elapses. Thereby, the stored water W in the bowl part 11 is replenished, and a water level rises.

  As described above, in the flush toilet 1, the jet water discharge amount Qjet and the rear rim water discharge amount Qd are controlled by adjusting the adjusted jet water discharge time T2 and the rear rim water discharge time T3 according to the changed distribution ratio. I did it. Thereby, each of the jet water discharge amount Qjet and the rear rim water discharge amount Qd can be controlled with a simple configuration.

  Next, the water discharge amount control unit 50 switches the switching valve 34 from the rim-side water supply channel 35 side to the tank-side water supply channel 36 side at time t13, finishes the rear rim cleaning, and starts water supply to the water storage tank 21. When the water level in the water storage tank 21 rises and reaches the second water level L2 at time t14, an OFF signal is input from the lower float switch 41 to the water discharge amount control unit 50. When the water level further rises and reaches the first water level L1, the water discharge amount control unit 50 receives an ON signal from the upper float switch 40 and closes the electromagnetic valve 33 (time t15).

  And the water discharge amount control part 50 returns to the standby state before washing | cleaning by switching the switching valve 34 from the tank side water supply path 36 side to the rim side water supply path 35 side at time t16, and a series of toilet flushing is completed. .

  Next, with reference to FIG. 4, the process which the controller 23 of the flush toilet 1 performs is demonstrated. FIG. 4 is a flowchart showing a processing procedure executed by the controller 23.

  As shown in FIG. 4, the water discharge amount control unit 50 of the controller 23 determines whether or not a cleaning instruction signal has been input (step S1). When it is determined that the cleaning instruction signal is not input (step S1, No), the water discharge amount control unit 50 repeats the process of step S1.

  On the other hand, when it determines with the washing | cleaning instruction | indication signal having been input (step S1, Yes), the water discharge amount control part 50 switches the switching valve 34 to the tank side water supply path 36 side (step S2), and makes the electromagnetic valve 33 continue. The valve is opened (step S3).

  Next, the water discharge amount control unit 50 switches the switching valve 34 to the rim side water supply channel 35 side (step S4), and starts the pump 22 (step S5). Subsequently, the state detection unit 51 of the controller 23 determines whether or not an off signal is input from the upper float switch 40 (step S6).

  When it is determined that the off signal is not input (step S6, No), the state detection unit 51 repeats step S6, while when it is determined that it is input (step S6, Yes), the counter is started. Measurement of the water level lowering time T1 is started (step S7).

  Next, the state detection unit 51 determines whether or not an ON signal is input from the lower float switch 41 (step S8). When it is determined that the ON signal is not input (No at Step S8), the state detection unit 51 repeats Step S8. On the other hand, if it is determined that the ON signal is input (step S8, Yes), the state detection unit 51 stops the counter and ends the measurement of the water level decrease time T1 (step S9).

  The water discharge amount control unit 50 changes the distribution ratio between the jet water discharge amount Qjet and the rear rim water discharge amount Qd based on the water level lowering time T1 (step S10). Then, the water discharge amount control unit 50 calculates the adjusted jet water discharge time T2 and the rear rim water discharge time T3 according to the changed distribution ratio (step S11).

  Subsequently, the water discharge amount control unit 50 determines whether or not the adjusted jet water discharge time T2 has elapsed after completion of the measurement of the water level decrease time T1 (step S12), and when it is determined that it has not elapsed (step S12, No), step S12 is repeated. On the other hand, when it is determined that the adjusted jet water discharge time T2 has elapsed (Yes at Step S12), the water discharge amount control unit 50 stops the pump 22 (Step S13).

  Next, the water discharge amount control unit 50 determines whether or not the rear rim water discharge time T3 has elapsed after stopping the pump 22 (step S14), and when it is determined that it has not elapsed (step S14, No). Step S14 is repeated. On the other hand, when it is determined that the rear rim water discharge time T3 has elapsed (step S14, Yes), the water discharge amount control unit 50 switches the switching valve 34 to the tank-side water supply path 36 side (step S15).

  Next, the water discharge amount control unit 50 determines whether or not an ON signal is input from the upper float switch 40 (step S16). When it is determined that the ON signal is not input (step S16, No), the water discharge amount control unit 50 repeats step S16, while when it is determined that the ON signal is input (step S16, Yes), the electromagnetic valve 33 is turned on. The valve is closed (step S17). And the water discharge amount control part 50 switches the switching valve 34 to the rim side water supply path 35 side (step S18), and toilet bowl washing | cleaning is completed.

  As described above, the flush toilet 1 according to the embodiment includes the toilet body 2, the water discharge amount control unit 50, and the state detection unit 51. The toilet body 2 includes a water conduit 10 through which washing water flows, and a bowl portion 11 that is connected to the water conduit 10 and is formed with a rim water spouting port 15 for rim water spouting and a jet water spouting port 16 for jet water spouting. . The water discharge amount control unit 50 controls the rim water discharge amount Qa + Qd of the wash water discharged from the rim water discharge port 15 and the jet water discharge amount Qjet of the wash water discharged from the jet water discharge port 16.

  The state detection unit 51 detects the state of at least one of the water conduit 10 and the jet water outlet 16. Further, the water discharge amount control unit 50 maintains the total sum of the rim water discharge amount Qa + Qd and the jet water discharge amount Qjet (total washing water amount Qtotal) based on the detection result detected by the state detection unit 51, and the jet water discharge amount. The distribution ratio between Qjet and the rim water discharge amount (rear rim water discharge amount Qd) after the jet water discharge ends is changed.

  Thereby, while saving water, the fall of washing | cleaning performance and the dispersion | variation in the sealing depth H can be suppressed.

  In the above embodiment, the adjusted jet water discharge amount Qc is increased / decreased to control the jet water discharge amount Qjet. However, the present invention is not limited to this. For example, the jet water discharge amount Qjet is increased / decreased. May be controlled.

  In the above description, the states of the jet-side water conduit 10b and the jet water outlet 16 are detected based on the water level lowering time T1, but the present invention is not limited to this. That is, for example, a flow meter is arranged in the jet side conduit 10b or the jet outlet 16 to measure the instantaneous flow rate, and the state of the jet side conduit 10b and the jet outlet 16 is detected based on the measured instantaneous flow rate. Also good. Moreover, you may comprise so that any one state may be detected among the jet side water conduit 10b and the jet water outlet 16. FIG.

  In the above description, each time the cleaning instruction signal is input, the water level lowering time T1 is measured and the adjusted jet water discharging time T2 and the rear rim water discharging time T3 are adjusted. However, the present invention is not limited to this. Absent. That is, the above-described time measurement and time adjustment are performed once at an arbitrary timing, for example, before shipment of the flush toilet 1 or at the time of actual toilet installation, and the obtained adjusted jet water discharge time T2 and rear rim water discharge time T3 are set. It may be stored in a storage device.

  Furthermore, the time measurement and the time adjustment described above may be performed every time a predetermined period elapses. Thereby, the adjustment jet water discharging time T2 and the rear rim water discharging time T3 can be appropriately corrected according to the secular change of the toilet body 2.

  In the above description, the water level of the water storage tank 21 is detected using the upper float switch 40 and the lower float switch 41. However, the present invention is not limited to this. That is, for example, the water level of the water storage tank 21 may be detected using other types of water level detection devices such as an ultrasonic type, a capacitance type, and a pressure type.

  Moreover, although it comprised so that the wash water in the water storage tank 21 may be pressurized with the pump 22 and jet water discharge is carried out above, it is not limited to this. That is, for example, wash water pressurized by the pump 22 may be used for both rim water discharge and jet water discharge.

  Further effects and modifications can be easily derived by those skilled in the art. Thus, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications can be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 3 Water supply function part 10 Water supply path 11 Bowl part 12 Drain trap line 15 Rim spout 16 Jet spout 21 Reservoir tank 22 Pump 23 Controller 40 Upper float switch 41 Lower float switch 50 Water discharge control Part 51 State detection part L1 1st water level L2 2nd water level

Claims (4)

A toilet body having a water conduit through which washing water flows, and a bowl portion connected to the water conduit and formed with a rim water outlet for rim water discharge and a jet water outlet for jet water discharge;
A water discharge amount control unit that controls a rim water discharge amount of the wash water discharged from the rim water discharge port and a jet water discharge amount of the wash water discharged from the jet water discharge port;
A state detection unit for detecting a state of at least one of the water conduit and the jet water outlet;
The water discharge amount control unit
Based on the detection result detected by the state detection unit, while maintaining the sum of the rim water discharge amount and the jet water discharge amount constant, the jet water discharge amount and the rim water discharge amount after the jet water discharge ends. A flush toilet characterized by changing the distribution ratio. A water storage tank for storing washing water for jet jetting;
A pump for pressurizing wash water in the water storage tank and discharging water from the jet spout,
The state detection unit
By measuring the water level lowering time until the water level in the water storage tank drops from the first water level to the second water level lower than the first water level by driving the pump, the water conduit and the jet discharge are measured. The flush toilet according to claim 1, wherein at least one state of the water mouth is detected. The water discharge amount control unit
By adjusting the jet water discharge time and the rim water discharge time after the jet water discharge ends according to the changed distribution ratio, the jet water discharge amount and the rim water discharge amount after the jet water discharge end are obtained. The flush toilet according to claim 1 or 2, wherein the toilet bowl is controlled. The water discharge amount control unit
The time of the jet water discharge is adjusted by the length of the blow period after the siphon action generated when the wash water is supplied from the jet water discharge port to the drain trap pipe is finished. Flush toilet.

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