JP2024004218A - flush toilet - Google Patents

Abstract

To provide a water closet capable of preventing scattering of washing water injected from a rim discharge port to an outside of a toilet bowl in an air hammer phenomenon when washing the toilet bowl for the first time.SOLUTION: A water closet according to this invention includes a main water supply path, a rim side water supply path and a tank side water supply path branching from each other at a downstream side of the main water supply path, a drive valve for supplying washing water from the main water supply path to the rim side water supply path and/or the tank side water supply path, and a control part for controlling the drive valve on the basis of a washing start signal, the control part having a first washing mode for controlling the drive valve to allow the supply of washing water to the rim side water supply path when receiving the washing start signal, and a second washing mode to allow the supply of washing water to the rim side water supply path after allowing the supply of washing water to the tank side water supply path. The control part switches into the first washing mode or the second washing mode on the basis of a water level in a water storage tank.SELECTED DRAWING: Figure 4

Description

The present invention relates to a flush toilet, and particularly to a flush toilet that can be switched to a plurality of cleaning modes.

Conventionally, as shown in Patent Document 1, cleaning water from the main water supply channel is supplied to the rim side water supply channel or the tank side water supply channel (jet side water supply channel) by switching the water supply channel switching valve, 2. Description of the Related Art Flush toilets that flush the toilet by discharging water from a rim spout or a jet spout are known.

In the toilet of Patent Document 1, the main water supply channel is provided with an electromagnetic on-off valve and a water supply channel switching valve from the upstream side, and the rim side water supply channel or the tank side water supply channel is connected downstream of the water supply channel switching valve. . When the electromagnetic on-off valve opens, flush water is supplied from the water supply source to the toilet bowl, and this flush water is supplied to the rim-side water supply channel or the tank-side water supply channel by the water supply channel switching valve. In addition, in the toilet of Patent Document 1, at the start of flushing the toilet, the water supply channel switching valve is momentarily fully opened on the tank side to supply flush water to the tank side water supply channel, and then the water supply channel switching valve is fully opened on the rim side. water is supplied to the rim side water supply channel. As a result, at the start of flushing the toilet bowl, air present in the main water supply channel is discharged into the water storage tank before water is discharged to the rim, thereby preventing abnormal noise and water splashing that occur when water is discharged from the rim.

Japanese Patent Application Publication No. 2009-7854

However, when flushing the toilet during construction or after maintenance (in the case of a trial run), it is necessary to clean not only the main water supply channel downstream of the electromagnetic on-off valve, but also the main water supply channel (water supply hose) upstream of the electromagnetic on-off valve. There is also air present in the main water supply channel, and more air is present in the main water supply channel than during normal toilet flushing. In this state, if a trial run is performed on the toilet of Patent Document 1 mentioned above, the air existing in the main water supply channel may be compressed and ejected from the rim spout at once, a so-called air hammer phenomenon. When this air hammer phenomenon occurs, there is a risk that the flushing water spouted from the rim spout may scatter outside the toilet bowl.

Therefore, the present invention has been made to solve the above-mentioned conventional problems, and when cleaning a toilet during construction or after maintenance, the cleaning water spouted from the rim spout due to the air hammer phenomenon is The purpose of the present invention is to provide a flush toilet that can prevent water from scattering outside the toilet bowl.

In order to achieve the above-mentioned object, the present invention provides a flush toilet switchable to a plurality of flushing modes, which comprises a bowl portion for receiving filth, and a rim located at the upper edge of the bowl portion and having an inner circumferential surface. a rim spout for discharging cleansing water along the inner peripheral surface of the rim, and a drain trap extending from the bottom of the bowl for discharging waste; A main water supply channel that supplies flush water into the toilet body, a rim-side water supply channel that branches from the main water supply channel and guides the flush water to the rim spout, and a water storage tank that branches from the main water supply channel and is installed downstream. a tank-side water supply channel that guides wash water to the main water supply channel; a drive valve that supplies the wash water from the main water supply channel to the rim-side water supply channel and/or the tank-side water supply channel; and a control unit that controls the drive valve based on a cleaning start signal. The controller has a first cleaning mode in which cleaning water is supplied to the rim side water supply channel by controlling the drive valve when a cleaning start signal is received, and a first cleaning mode in which the cleaning water is supplied to the tank side water supply channel. A second cleaning mode is provided in which the cleaning water is supplied to the rim side water supply channel after being supplied, and the control unit is characterized in that it switches to the first cleaning mode or the second cleaning mode based on the water level in the water storage tank. .

In the present invention configured as described above, there is a first cleaning mode in which cleaning water is supplied to the rim-side water supply channel, and a first cleaning mode in which the cleaning water is supplied to the rim-side water supply channel after the washing water is supplied to the tank-side water supply channel. The controller has two cleaning modes, and the control unit switches between the first cleaning mode and the second cleaning mode based on the water level in the water storage tank. The mode is switched to 2 cleaning mode, and after supplying cleaning water to the tank side water supply channel, the cleaning water is supplied to the rim side water supply channel. Thereby, the air present in the main water supply channel can be discharged into the water storage tank. Therefore, when flushing the toilet bowl, it is possible to prevent the flushing water spouted from the rim spout due to the air hammer phenomenon from scattering outside the toilet bowl.

In the present invention, preferably, the drive valve is set to supply cleaning water to the rim side water supply channel in a standby state before receiving the cleaning start signal.
In the present invention configured in this manner, for example, in the event of a power outage or when the drive valve fails, the toilet bowl can be flushed by manually opening the electromagnetic on-off valve or the like. Furthermore, since the cleaning water can be discharged from the rim spout, it is possible to prevent water from overflowing and leaking.

In the present invention, preferably, in the second cleaning mode, the control unit controls the drive valve to supply the cleaning water to the rim side water supply channel after the water level in the water storage tank reaches a predetermined water level.
In the present invention configured in this way, in the second cleaning mode, in order to supply cleaning water to the water storage tank and exhaust air until the water level in the water storage tank reaches a predetermined water level, air can be reliably discharged into the water storage tank.

In the present invention, preferably, the control unit switches to the first cleaning mode or the second cleaning mode based on the water level in the water storage tank and the number of times of current cleaning or the usage time interval since the previous cleaning. controls so as not to switch to the second cleaning mode if the current number of cleanings is greater than a predetermined number of times or if the usage time interval is shorter than a predetermined time.
In the present invention configured in this manner, the second flushing mode is not executed, and the first flushing mode is executed to clean the toilet unless the toilet is flushed or the toilet has not been used for a long time due to a water outage or the like. can be washed.

In the present invention, preferably the predetermined number of times is the first time.
In the present invention configured in this way, the second cleaning mode can be executed when cleaning the toilet bowl.

In the present invention, preferably, the control unit resets the past number of flushes when the supply of power or supply of flush water to the flush toilet is stopped or reduced.
In the present invention configured as described above, the second flushing mode is executed in the event of a power outage or water outage, so that the flushing water spouted from the rim spout is not scattered outside the toilet bowl due to the air hammer phenomenon that occurs when the toilet is restored. can be prevented.

Further, in order to achieve the above-mentioned object, the present invention provides a flush toilet that can be switched to a plurality of cleaning modes, which includes a bowl portion that receives filth, and a bowl portion that is located on the upper edge of the bowl portion and has an inner circumferential surface. a rim spout that spouts cleaning water along the inner peripheral surface of the rim, a drain trap extending from the bottom of the bowl to discharge waste, and a drain trap located at the bottom of the bowl. A toilet main body comprising a jet water spouting part for discharging washing water toward the inlet of the toilet, a main water supply channel that supplies washing water from a water supply source into the toilet main body, and a main water supply channel branching from the main water supply channel. A rim-side water supply channel that guides wash water to the rim spout, a jet-side water supply channel that branches from the main water supply channel and guides wash water to the jet water spout, and a rim-side water supply channel or/and a jet-side water supply channel from the main water supply channel. a drive valve that supplies cleaning water to the cleaning device; and a control unit that controls the drive valve based on a cleaning start signal, and the control unit controls the drive valve when receiving the cleaning start signal. A first cleaning mode in which cleaning water is supplied to the rim-side water supply channel, and a second cleaning mode in which the cleaning water is supplied to the rim-side water supply channel after the cleaning water is supplied to the jet-side water supply channel, and the control unit includes: It is characterized by switching to the first cleaning mode or the second cleaning mode based on the current number of cleanings or the usage time interval from the previous cleaning.

In the present invention configured in this manner, there is a first cleaning mode in which cleaning water is supplied to the rim side water supply channel, and a first cleaning mode in which cleaning water is supplied to the jet side water supply channel and then to the rim side water supply channel. Equipped with two cleaning modes, the control unit automatically switches to the first cleaning mode or the second cleaning mode based on the number of current cleanings or the usage time interval since the previous cleaning. The second cleaning mode is switched to, and after the cleaning water is supplied to the jet side water supply channel, the cleaning water is supplied to the rim side water supply channel. Thereby, the air present in the main water supply channel can be discharged to the jet side water supply channel. Therefore, when flushing the toilet bowl, it is possible to prevent the flushing water spouted from the rim spout due to the air hammer phenomenon from scattering outside the toilet bowl.

According to the flush toilet of the present invention, when flushing the toilet, it is possible to prevent the flushing water spouted from the rim spout from scattering outside the toilet due to the air hammer phenomenon.

1 is an overall configuration diagram of a flush toilet according to a first embodiment of the present invention. 1 is a block diagram showing a controller unit of a flush toilet according to a first embodiment of the present invention. FIG. FIG. 3 is a diagram showing details of the water supply channel switching valve of the flush toilet according to the first embodiment of the present invention. It is a flowchart which shows the switching control of the washing|cleaning mode of the flush toilet according to 1st Embodiment of this invention. It is a time chart showing the operation of the flush toilet in the "trial run mode" of the first embodiment of the present invention. It is a time chart showing the operation of the flush toilet in the "normal cleaning mode" of the first embodiment of the present invention. FIG. 2 is an overall configuration diagram of a flush toilet according to a second embodiment of the present invention. FIG. 7 is an overall configuration diagram of a flush toilet according to a third embodiment of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A flush toilet according to a first embodiment of the present invention (hereinafter referred to as a first embodiment) will be described below with reference to the accompanying drawings.
First, the overall configuration of a flush toilet according to a first embodiment will be explained with reference to FIGS. 1 to 3.
FIG. 1 is an overall configuration diagram of a flush toilet according to the first embodiment, FIG. 2 is a block diagram showing a controller unit of the flush toilet according to the first embodiment, and FIG. 3 is a diagram of the flush toilet according to the first embodiment. It is a figure showing the details of a water supply channel switching valve.

As shown in FIGS. 1 and 2, the flush toilet 1 according to the first embodiment includes a toilet body 2 made of ceramic, a valve unit 4 that supplies flush water to the toilet body 2, and a water storage tank that stores flush water. 6, and a pressurizing pump 8 that supplies flush water stored in the water storage tank 6 to the toilet main body 2.

The toilet main body 2 includes a bowl part 10 for receiving waste, a rim part 12 located at the upper edge of the bowl part 10 and having an inner circumferential surface, and a drain trap part extending from the bottom of the bowl part 10 for discharging waste. 14 are formed. A rim water conduit 16 is formed inside the rim portion 12, and a rim water spout 20 for discharging rim water is formed in a rim water spouting portion 18, which is the downstream end of the rim water conduit 16. The rim spout 20 is formed at the front right side of the bowl portion 10 when the flush toilet 1 is viewed from the front, and spouts flush water backward to create a swirling flow along the inner circumferential surface of the rim portion 12. It is designed to form a

Further, a jet water conduit 22 is formed below the toilet main body 2, and a jet water spout 26 for discharging jet water is formed in a jet water spouting section 24 that is the downstream end of this jet water conduit 22. The jet spout 26 is located at the bottom of the bowl portion 10 and is arranged substantially horizontally toward the inlet portion 14a of the drain trap portion 14, so as to spout cleaning water toward the inlet portion 14a of the drain trap portion 14. It has become.

The drain trap section 14 consists of an inlet section 14a, a trap rising pipe 14b rising from the inlet section 14a, and a trap descending pipe 14c descending from the trap rising pipe 14b. The space between them is the top 14d. Here, a drain socket 28 is connected to the lower end of the trap descending pipe of the drain trap section 14.

The flush toilet according to the first embodiment is directly connected to a water pipe 30 that supplies flush water, and flush water is spouted from the rim spout 20 by the water supply pressure of the water supply. Regarding the jet water spout, the cleaning water stored in the water storage tank 6 is pressurized by the pressurizing pump 8, and water is spouted from the jet water spout 26 at a large flow rate.

Next, referring to FIG. 1, the valve unit 4 of the flush toilet according to the first embodiment will be explained in detail.
As shown in FIG. 1, a main water supply channel 32 is provided to which washing water is supplied from a water supply pipe 30 that is a water supply source, and this main water supply channel 32 includes, from the upstream side, a stop valve 34, a strainer 36, a branch A metal fitting 38, a constant flow valve 40, a diaphragm type electromagnetic on-off valve 42, and a water supply channel switching valve 44 are provided, respectively. These constant flow valve 40, electromagnetic on-off valve 42, and water supply channel switching valve 44 are integrally assembled as the valve unit 4. The main water supply channel 32 is composed of a water supply hose connected to the water pipe 30 outside the toilet bowl and a resin pipe connected downstream of the water supply hose.

Furthermore, on the downstream side of the water supply channel switching valve 44, there are a rim side water supply channel 46 for supplying wash water to the rim spout 20, and a tank side water supply channel 48 for supplying wash water to the water storage tank 6. It is connected. The rim conduit 16 is connected to the downstream end of the rim side water supply conduit 46, so that cleaning water is supplied to the rim spout 20 by the water supply pressure of the water supply.

The constant flow valve 40 is for restricting the wash water that has flowed in through the stop valve 34, the strainer 36, and the branch fitting 38 to a predetermined flow rate or less. Further, the cleaning water that has passed through the constant flow valve 40 flows into the electromagnetic on-off valve 42, and the washing water that has passed through the electromagnetic on-off valve 42 is transferred from the rim-side water supply channel 46 on the rim side to the rim by the water supply channel switching valve 44. Water is supplied to the water storage tank 6 from the water spout 20 or from a tank-side water supply channel 48 on the tank side.

The water supply channel switching valve 44 (driven valve) can supply cleaning water to both the rim side water supply channel 46 and the tank side water supply channel 48 at the same timing, and the ratio of the water supply amount and flow rate to the rim side and the tank side is controlled. It is a switching valve that can be changed arbitrarily. As shown in FIG. 3, the water supply channel switching valve 44 has a first port 44a that opens to the main water supply channel 32, a second port 44b that opens to the tank side water supply channel 48, and a third port that opens to the rim side water supply channel 46. It is equipped with 44c. The water supply channel switching valve 44 includes a rotor (valve body) 44d for switching each of these ports, and the rotor 44d is driven to a desired position by a stepping motor (not shown) as a driving motor. It has become.

More specifically, when supplying wash water to the water storage tank 6, the water supply channel switching valve 44 closes the third port 44c and switches between the first port 44a and the second port 44c, as shown in FIG. 3(a). On the other hand, when the port 44b is communicated with the rim spout 20, the second port 44b is closed and the first port 44a and the third port 44c are communicated with each other, as shown in FIG. 3(b). let
Furthermore, as shown in FIG. 3(c), in the water supply channel switching valve 44, the rotor 44d closes a portion of each of the second port 44b and the third port 44c, thereby switching the main water supply channel 32 toward the rim side. It is also possible to communicate with both the water supply channel 46 and the tank side water supply channel 48.

As described above, in the first embodiment, by driving the rotor 44d in the water supply channel switching valve 44, the total amount of wash water supplied to the rim water outlet 20 (rim side) and the water storage tank 6 (water storage tank side) is controlled. When the flow rate is 100%, from a state where all the wash water is supplied to the rim side water supply channel 46 (rim side 100%) to a state where all the wash water is supplied to the tank side water supply channel 48 (water storage tank side 100%) The ratio of the flow rate of the cleaning water supplied to the rim-side water supply channel 46 and the tank-side water supply channel 48 can be switched within the range of .

Further, a pump side water supply channel 50 is connected to the lower part of the water storage tank 6, and a pressurizing pump 8 including a pump chamber 52 is connected to the downstream end of this pump side water supply channel 50. Further, the pressurizing pump 8 and the jet water conduit 22 are connected by a jet side water supply conduit 54, so that the pressurizing pump 8 pressurizes the cleaning water stored in the water storage tank 6 and supplies it to the jet water spout 26. It has become.

The pressurizing pump 8 is for pressurizing the cleaning water stored in the water storage tank 6 and discharging it from the jet spout 26 . The pressurizing pump 8 is connected by a pump-side water supply channel 50 extending from the lower part of the water storage tank 6, and pressurizes the wash water stored in the water storage tank 6. In the first embodiment, the pressurizing pump 8 pressurizes the wash water in the water storage tank 6 and discharges the wash water from the jet spout 26 at a predetermined flow rate. Although the flush toilet 1 of the first embodiment employs the pressurizing pump 8, a pressure accumulating booster that accumulates water energy may be used instead.

Next, the above-mentioned rim side water supply channel 46 is provided with a rim water spouting vacuum breaker 53, which prevents wash water from flowing back from the rim water spout 20 when negative pressure is generated in the rim side water supply channel 46. ing. Furthermore, as shown in FIG. 1, the rim water discharge vacuum breaker 53 is disposed above the upper end surface of the bowl portion 10, thereby reliably preventing backflow. Further, the wash water overflowing from the atmosphere opening part of the rim water discharge vacuum breaker 53 flows into the water storage tank 6 through a return pipe 56. A vacuum breaker 58, which is a check valve, is also provided in the tank side water supply channel 48 to prevent backflow of wash water from the water storage tank 6.

The water storage tank 6 is a closed type water storage tank, and a ball type check valve 60 is provided at the connection portion between the tank side water supply channel 48 and the water storage tank 6. With this ball-type check valve 60, even when the water storage tank 6 becomes full of water beyond the upper end of the overflow channel, which will be described later, the ball floats up and closes the connection with the tank-side water supply channel 48. Therefore, the wash water is prevented from flowing back into the tank side water supply channel 48. Note that in the first embodiment, the water storage tank 6 has an internal volume of about 2.5 liters.

Similarly, a ball type check valve 62 is also provided at the connection between the return pipe 56 and the water storage tank 6, so that the water storage tank 6 is filled with water beyond the upper end of an overflow flow path 72, which will be described later. Even if the cleaning water is removed, the cleaning water will not flow back into the return pipe 56.

Further, a drain plug 64 is provided at the bottom of the water storage tank 6. This water drain plug 64 is arranged at a height near the lower end of the water storage tank 6, below the pressure pump 8. Therefore, by opening the drain valve 64, the cleaning water in the water storage tank 6 and the pressure pump 8 can be discharged during maintenance or the like.

The valve unit 4 has a built-in controller 66 that controls the opening/closing operation of the electromagnetic on-off valve 42, the switching operation of the water supply channel switching valve 44, and the rotational speed and operating time of the pressurizing pump 8.

Inside the water storage tank 6, an upper end float switch 68 and a lower end float switch 70 are arranged.
The upper end float switch 68 is turned on when the water level in the water storage tank 6 reaches a predetermined position L2 that is slightly lower than the highest water level L3 during normal use, and the controller 66 detects this and closes the electromagnetic on-off valve 42. let

The lower end float switch 70 is turned on when the water level in the water storage tank 6 falls to the lowest water level L1 during normal use, and the controller 66 detects this and stops the pressure pump 8.

Furthermore, an overflow channel 72 is provided, and the upper end of this overflow channel 72 opens into the water storage tank 6, and the lower end thereof is connected to the jet side water supply channel 54.

A flapper valve 74, which is a check valve, is attached to this overflow passage 72. The overflow channel 72 and the flapper valve 74 prevent the wash water from flowing backward from the jet spout 26, and also make it possible to cut the gap between them.

As shown in FIG. 2, when the user presses the toilet flushing switch 76, the controller 66 (control unit) sequentially operates the electromagnetic on-off valve 42, the water supply channel switching valve 44, and the pressure pump 8 to operate the normal toilet flushing switch 76. In cleaning, water is spouted from the rim water spout 20, and while the rim water spout is continued, water is then started from the jet water spout 26 to wash the bowl portion 10. Further, after the cleaning is completed, the controller 66 opens the electromagnetic on-off valve 42 and switches the water supply channel switching valve 44 to the water storage tank 6 side to replenish the water storage tank 6 with cleaning water. When the water level in the water storage tank 6 rises and the upper end float switch 68 detects a specified amount of water storage, the controller 66 closes the electromagnetic on-off valve 42 to stop water supply.

Further, when the toilet flushing switch 76 is pressed as a flushing start operation and a flushing start signal is received, the controller 66 performs " Automatically switches to one of the three cleaning modes: normal cleaning mode (first cleaning mode), test run mode (second cleaning mode), and water supply mode (third cleaning mode). The switch can be changed without the operator having to operate a changeover switch or the like. Here, the "normal cleaning mode" is a cleaning mode in which normal toilet bowl cleaning is performed. The "trial run mode" is a cleaning mode in which, for example, when cleaning the toilet bowl for the first time during construction (in the case of a trial run), the toilet bowl is flushed after exhausting the air present in the main water supply channel. "Water supply mode" is a cleaning mode in which, when the water storage tank is empty, water is stored in the water storage tank and then the toilet bowl is flushed.

Further, the controller 66 sets the water supply channel switching valve 44 to supply washing water to the rim side water supply channel 46 in a standby state before receiving the washing start signal. The controller 66 also determines, based on a signal from a sensor (not shown), whether the supply of power to the flush toilet has stopped or decreased due to a power outage or the like. Further, the controller 66 measures the usage time interval since the previous cleaning, and based on this usage time interval, determines whether the supply of cleaning water has stopped or decreased due to a water outage or the like. There is.

Hereinafter, switching control of the flush mode of the flush toilet according to the first embodiment will be described. FIG. 4 is a flowchart showing switching control of the flushing mode of the flush toilet according to the first embodiment. In FIG. 4, S indicates each step.

First, as shown in FIG. 4, in S1, the user performs a cleaning start operation. When the user presses the toilet bowl cleaning switch 76, a cleaning start signal is sent from the toilet bowl cleaning switch 76 to the controller 66.

In S2, when the controller 66 receives the cleaning start signal, the controller 66 determines whether the lower end float switch 70 in the water storage tank 6 is in the on state (whether or not the water storage tank 6 is empty). If the controller 66 has not received the on signal from the lower end float switch 70, it is determined that the lower end float switch 70 is in the off state (S2; No). In this case, since cleaning water has accumulated in the water storage tank 6, the controller 66 drives the electromagnetic on-off valve 42, the water supply channel switching valve 44, and the pressure pump 8 to execute the "normal cleaning mode" ( S6). When the controller 66 receives the on signal from the lower end float switch 70, it is determined that the lower end float switch 70 is in the on state and the water storage tank 6 is empty (S2; Yes).

In S3, the controller 66 determines whether the current number of times the cleaning is performed is the first time (first time). Data on the number of times of washing performed in the past is stored in a storage unit (not shown) of the controller 66, and the controller 66 calculates the number of times of washing by adding "1" to this data of the number of washings in the past. Determine as. If the past washing number data is "0", the controller 66 determines that the current number of washings is the first time (S3; Yes). In this case, since air is present in the main water supply channel 32 (especially the main water supply channel 32 on the upstream side of the electromagnetic on-off valve 42), the electromagnetic on-off valve 42 and the water supply channel switching valve 44 are driven by the controller 66. A "trial run mode" is executed (S4). When the past cleaning frequency data is "1 or more", the controller 66 determines that the current cleaning frequency is the second or more (S3; No), and the controller 66 controls the electromagnetic on-off valve 42 and the water supply channel switching valve. 44 is driven to execute the "water supply mode" (S5).
Here, the first time (first time) refers not only to the case where the toilet bowl is actually flushed for the first time, but also when the past flush frequency data is reset and the current flush frequency is determined to be the first flush, as described below. Contains.

Further, in S3, if the usage time interval from the previous cleaning has passed a predetermined time (for example, 12 hours) when the controller 66 receives the cleaning start signal, the controller 66 resets the past cleaning frequency data to "0". ”, and it is determined that the current number of times of cleaning is the first time (S3; Yes). As a result, if the supply of flush water to the flush toilet is stopped due to a water outage, etc., the controller 66 sets the "trial run mode" in S4 because air may be present in the main water supply channel 32. It is set to run.

In addition, in S3, if the power supply to the flush toilet is stopped when the controller 66 receives the flushing start signal, the controller 66 resets the past flushing frequency data to "0" and sets the current flushing frequency as "0". It is determined that this is the first time (S3; Yes). As a result, if the power supply to the flush toilet is stopped due to a power outage or the like, the controller 66 executes the "trial run mode" in S4 because air may be present in the main water supply channel 32. It is supposed to be done.

In S4 to S6, the controller 66 executes one of "normal cleaning mode," "test run mode," and "water supply mode." This completes the cleaning mode switching control.

In the first embodiment described above, in S3, when the usage time interval passes a predetermined time or when the power supply is stopped, the past cleaning frequency data is reset to "0" and the current cleaning frequency data is reset. However, instead of or in addition to these, if the number of flushes per day has decreased or if the electricity supplied to the flush toilet has decreased, The cleaning frequency data may be reset to "0" and it may be determined that the current cleaning frequency is the first.

Next, the operation of the flush toilet in the "trial run mode", which corresponds to step S4 above, will be explained. FIG. 5 is a time chart showing the operation of the flush toilet in the "trial run mode".

As shown in FIG. 5, first, in the standby state (time t0 to t1), the water supply channel switching valve 44 is placed in the fully open state (100% on the rim side) to the rim side water supply channel 46, that is, the tank side water supply channel 48 It is in the fully closed position (0% on the water storage tank side).

First, in a standby state (time t0 to t1), when the toilet flushing switch 76 is pressed, the controller 66 receives a flushing start signal (time t1), and the water supply channel switching valve 44 is fully opened to the rim side water supply channel 46. From the position, the tank side water supply channel 48 is switched to the fully open position (100% on the water storage tank side) (time t1 to t2).

Next, at time t2, the water supply channel switching valve 44 is in the fully open state (100% on the water storage tank side) for the tank side water supply channel 48, that is, in the fully closed state (0% on the rim side) for the rim side water supply channel 46. At this time, the electromagnetic on-off valve 42 opens, and the wash water flows into the main water supply channel 32 and is discharged into the water storage tank 6. Thereby, the air existing in the main water supply channel 32 upstream of the electromagnetic on-off valve 42 and between the electromagnetic on-off valve 42 and the water supply channel switching valve 44 can be discharged into the water storage tank 6. It looks like this. As a result, it is possible to prevent the air existing in the main water supply channel 32 from being compressed and ejected from the rim spout 20 all at once.

Next, between times t2 and t5, tank water supply is continued for a predetermined period of time, and cleaning water is stored in the water storage tank 6. At time t3, when the water level in the water storage tank 6 reaches a predetermined water level L1, the lower end float switch 70 is turned off, and at time t4, when the water level in the water storage tank 6 reaches a predetermined water level L2, the upper end float switch 68 is turned on. become. Water supply from the tank continues from time t4 to t5, and at time t5, the water level in the water storage tank 6 reaches a predetermined water level L3, which is slightly higher than L2, and the water storage tank 6 becomes full.

Next, from time t5 to t6, the water supply channel switching valve 44 changes from a fully open position (100% on the water storage tank side) to the tank side water supply channel 48 to a fully open position (100% on the rim side) to the rim side water supply channel 46. ) can be switched to As a result, cleaning water is spouted from the rim water spout 20.

Next, between times t6 and t8, the water supply channel switching valve 44 is maintained at the fully open position (rim side 100%) to the rim side water supply channel 46. Cleaning water is continuously spouted from the rim spout 20 for a predetermined period of time from time t6. After a predetermined period of time has elapsed, at time t7, the electromagnetic on-off valve 42 is closed and rim water discharging is stopped.

Next, between times t8 and t9, the water supply channel switching valve 44 is switched from the fully open position for the rim side water supply channel 46 to the fully open position for the tank side water supply channel 48, and between times t9 and 10. The tank side water supply channel 48 is maintained in a fully open position.

Next, between time t10 and t11, the water supply channel switching valve 44 is switched from the position where the tank side water supply channel 48 is fully open to the position where the rim side water supply channel 46 is fully open. The switching valve 44 returns to the fully open position in the rim side water supply channel 46, and returns to the standby state (same state as time t0 to t1).

The controller 66 is able to receive the cleaning start signal in the standby state from time t0 to t1 and after time t11, but the controller 66 does not receive the cleaning start signal from time t1 to t11. There is. This ensures that the "trial run mode" is executed reliably.

Next, the operation of the flush toilet in the "water supply mode", which corresponds to step S5 above, will be explained.

First, in the standby state, the water supply channel switching valve 44 is in a fully open position in the rim side water supply channel 46 . When the toilet bowl cleaning switch 76 is pressed in this standby state, the controller 66 receives a cleaning start signal, and the water supply channel switching valve 44 is switched to a position where the rim side water supply channel 46 and the tank side water supply channel 48 are in the open state. Next, the electromagnetic on-off valve 42 is opened, and rim water supply and tank water supply are started. When the tank water supply continues for a predetermined period of time and the water storage tank 6 becomes full, the water supply channel switching valve 44 is placed in the fully open position in the rim side water supply channel 46 . By providing such a water supply mode, it is possible to prevent the washing water spouted from the rim spout 20 from scattering outside the toilet bowl due to the air hammer phenomenon, while also preventing the washing water in the water storage tank 6 from overflowing and leaking outside the machine. can be avoided. Further, the water storage tank 6 can be reliably filled with water to complete the cleaning operation.

Next, the operation of the flush toilet in the "normal cleaning mode", which corresponds to step S6 above, will be explained. FIG. 6 is a time chart showing the operation of the flush toilet in the normal flushing mode.

As shown in FIG. 6, first, in the standby state (time t0 to t1), the water supply channel switching valve 44 is set to the fully open state (100% on the rim side) to the rim side water supply channel 46, that is, to the tank side water supply channel 48. It is in the fully closed position (0% on the water storage tank side).

First, in a standby state (time t0 to t1), when the toilet flushing switch 76 is pressed, the controller 66 receives a flushing start signal (time t1), and the water supply channel switching valve 44 is fully opened to the rim side water supply channel 46. (100% on the rim side) to the soft rim water discharge start position (30% on the rim side, 70% on the water storage tank side) (times t1 to t2). At the starting position of soft rim water discharge, the main water supply channel 32 communicates with both the rim side water supply channel 46 and the tank side water supply channel 48, and the water supply channel switching valve 44 is in the state of 30% on the rim side and 70% on the water storage tank side. ing. Here, "soft rim water spouting" refers to cleaning water from the rim spout instead of spouting a large amount of water at once from the rim spout in order to prevent abnormal noises and water splashing that occur when water is spouted on the rim. This is a water spouting form that gradually spews water.

Next, at time t3, the electromagnetic on-off valve 42 opens with the water supply channel switching valve 44 set at 30% on the rim side and 70% on the water storage tank side, and the wash water flows into the main water supply channel 32. This makes it possible to discharge the air present in the main water supply channel 32 on the upstream side of the water supply channel switching valve 44 into the water storage tank 6 while discharging the wash water from the rim spout 20. ing. As a result, when cleaning starts, part of the air present in the main water supply channel 32 is discharged to the tank side water supply channel 48, and the rest is discharged from the rim side water supply channel 46, compared to the conventional case where the tank side is fully opened. This makes it possible to suppress an increase in the internal pressure of the water storage tank 6. Furthermore, since only a portion of the air present in the main water supply channel 32 is discharged from the rim water spout, it is possible to prevent abnormal noise and water splashing that occur during rim water spouting. Furthermore, since rim water discharging is started immediately after receiving the cleaning start signal, it is possible to reduce the time lag from the cleaning start operation to the start of rim water discharging.
In the first embodiment described above, the soft rim water discharge start position is set to a position where the water supply channel switching valve 44 is in a state of 30% on the rim side and 70% on the water storage tank side, but is not limited to this. The position may be 80-60% on the water storage tank side.

Next, between times t3 and t4, the water supply channel switching valve 44 is gradually switched from a position of 30% on the rim side and 70% on the water storage tank side to a position of 50% on the rim side and 50% on the water storage tank side. Between times t3 and t4, the flow rate increase rate, which is the rate of change in the amount of increase in the flow rate of the wash water supplied to the rim side water supply channel 46, is a relatively small first flow rate increase rate A, which is different from this. Conversely, the flow rate reduction rate, which is the rate of change in the amount of decrease in the flow rate of the wash water supplied to the tank-side water supply channel 48, is a relatively small first flow rate reduction rate. That is, the flow rate of the wash water supplied to the rim side water supply channel 46 increases at a relatively small first flow rate increase rate A, and conversely, the flow rate of the wash water supplied to the tank side water supply channel 48 increases. decreases at a relatively small first flow rate reduction rate. As a result, the amount of cleansing water spouted from the rim spout 20 does not increase all at once, but increases gradually, making it possible to prevent abnormal noise and water splashing that occur when water is spouted from the rim. Further, since the amount of cleaning water supplied to the tank gradually decreases, an increase in the internal pressure of the water storage tank 6 can be suppressed.

Further, during the time (time t3 to t4) during which the wash water is supplied to the rim side water supply channel 46 at the first flow rate increase rate A, the wash water is supplied to the rim side water supply channel 46 at a second flow rate increase rate B, which will be described later. It is set longer than the supplied time (times t4 to t5). As a result, it is possible to reliably suppress an increase in the internal pressure of the water storage tank 6, and it is also possible to reliably prevent abnormal noise and water splashing that occur when water is discharged from the rim.

Next, at time t4, the water supply channel switching valve 44 is in the position of 50% on the rim side and 50% on the water storage tank side, and the flow rate of the wash water supplied to the rim side water supply channel 46 increases. 46 (approximately 70 to 90% of the cross-sectional area of each water supply channel) is almost filled with wash water.

Next, between time t4 and time t5, the water supply channel switching valve 44 gradually changes from the position of 50% on the rim side and 50% on the water storage tank side to the fully open state (100% on the rim side) to the rim side water supply channel 46. can be switched to Between times t4 and t5, the flow rate of cleaning water supplied to the rim side water supply channel 46 increases at a second flow rate increase rate B that is larger than the first flow rate increase rate A; The flow rate of the wash water supplied to the side water supply channel 48 is reduced at a second flow rate reduction rate that is greater than the first flow rate reduction rate. As a result, the flow rate of the wash water supplied to the rim side water supply channel 46 is increased at the second flow rate increase rate B, which is larger than the first flow rate increase rate A, so that all the wash water can be supplied to the rim water spout 20 in a relatively short time. It is now possible to spray water from the
Note that between t2 and t5, in the first embodiment, the flow rate increase rate is changed in two stages (first flow rate increase rate A and second flow rate increase rate B), but the present invention is not limited to this. , the flow rate change rate may be changed in three or more stages.

From time t5 to time t13, a constant large amount of cleaning water is continuously supplied to the rim spout 20, and the cleaning water continues to be spouted from the rim spout 20.

Next, after a predetermined period of time has elapsed from time t5, between time t6 and t11, the pressure pump 8 is turned on to perform jet water discharging, and the pressure pump 8 jets out the cleaning water in the water storage tank 6. The water is supplied to the water outlet 26, and the cleaning water is spouted from the jet water outlet 26.

Since the jet water is spouted with the water level of the pooled water in the bowl part 10 and the drain trap part 14 rising due to the rim water spouting, the siphon action can be started in a short time and a strong siphon action can be generated. It looks like this. As a result, it is possible to reduce the amount of jet water used to activate the siphon action, thereby achieving water savings.

Furthermore, since rim water is continuously discharged without interruption during jet water discharging, it becomes difficult for air to flow into the inlet portion 14a of the drain trap section 14, and the sound of the siphon cutting can be suppressed. In addition, by discharging jet water while collecting floating dirt in the center of the pooled water, floating dirt is prevented from sticking to the bowl surface, and floating dirt can be discharged reliably. There is.

Next, when discharging jet water, the controller 66 controls the rotation speed of the pressure pump 8 as follows.
First, the controller 66 rapidly increases the rotational speed of the pressure pump 8 from time t7 to t8, and causes the pressure pump 8 to rotate at high speed between time t8 and t9. As a result, the pressure applied by the pressure pump 8 increases, and a large flow rate (first flow rate) of cleaning water is spouted from the jet water spout 26 . At this time, since the rim water is continuously spouted from the rim spout 20, the flow rate of the wash water spouted from the rim spout 20 is added, and a large flow of wash water enters the inlet section 14a of the drain trap section 14. The water flows in, rapidly causing a siphon phenomenon, and the accumulated water and dirt in the bowl portion 10 are quickly discharged.

Next, from time t9 to time t11, in the case of large cleaning (see the solid line in FIG. 6), the controller 66 reduces the rotation speed of the pressure pump 8 and rotates the pressure pump 8 at a medium speed. As a result, the pressurizing force by the pressurizing pump 8 is reduced, and cleaning water is discharged from the jet water spout 26 at a medium flow rate (second flow rate) smaller than the first flow rate. At this time, since a medium flow rate of wash water flows into the inlet part 14a of the drain trap part 14, the siphon effect is maintained and the accumulated water and dirt in the bowl part 10 are reliably discharged. In addition, since the cleaning water discharged from the jet spout 26 is reduced from the first flow rate to the second flow rate to maintain a siphon effect, it is possible to simultaneously achieve drainage performance of waste, etc. and water conservation. It has become.

Further, from time t9 to time t11, in the case of small cleaning (see the dotted line in FIG. 6), the controller 66 reduces the rotation speed of the pressure pump 8, rotates the pressure pump 8 at a low speed, and then rotates the pressure pump 8 at a medium speed. Rotate. As a result, the pressurizing force by the pressurizing pump 8 is reduced, and a small flow rate (third flow rate) of cleaning water smaller than the first and second flow rates is spouted from the jet water outlet 26, and after that, before the siphon phenomenon weakens. Then, the rotation speed of the pressure pump 8 increases, the pressure pump 8 is rotated at a medium speed, and a medium flow rate (second flow rate) of cleaning water is spouted from the jet water spout 26 . This makes it possible to maintain the siphon effect with a lower flow rate than in the case of large cleaning.

Next, at time t10, when the water level of the cleaning water in the water storage tank 6 falls below L1 and the lower end float switch 70 is turned on, the operation of the pressure pump 8 is stopped after a predetermined delay time ( time t11). At this time, the rotation speed of the pressure pump 8 is slowly reduced from time t11 to time t12 so that the water discharged from the jet water spout 26 is gradually reduced. This makes it possible to prevent the generation of cutting noises caused by abruptly ending jet water discharging.

At time t11, the jet water spout has ended, but at this time, the rim water spout is still continuing, and only the rim water spout (rear rim water spout) continues for a predetermined time from time t11 to time t13.
Thereafter, from time t13 to time t14, the water supply channel switching valve 44 is switched from fully open on the rim side to fully open on the water storage tank side. Thereby, cleaning water is stored in the water storage tank 6.

At time t15, when the water level in the water storage tank 6 reaches a predetermined water level L1, the lower end float switch 70 is turned off, and at time t16, when the water level in the water storage tank 6 reaches a predetermined water level L2, the upper end float switch 68 is turned on. become. Water supply to the tank continues from time t16 to t17, and at time t17, the electromagnetic on-off valve 42 closes and the supply of wash water to the water storage tank 6 is stopped. As a result, the water level in the water storage tank 6 becomes a predetermined water level L3 that is slightly higher than L2, and the water storage tank 6 becomes full of water. Next, between times t17 and t18, the water supply channel switching valve 44 is maintained in the fully open position to the tank side water supply channel 48.

Next, between times t18 and t19, the water supply channel switching valve 44 is switched from the fully open position for the tank side water supply channel 48 to the fully open position for the rim side water supply channel 46, and at time t19, the water supply channel switching valve 44 The switching valve 44 returns to the fully open position in the rim side water supply channel 46, and returns to the standby state (same state as time t0 to t1).

Next, a flush toilet according to a second embodiment (hereinafter referred to as a second embodiment) of the present invention will be described with reference to FIG. FIG. 7 is an overall configuration diagram of a flush toilet according to the second embodiment.
The basic configuration of the flush toilet according to the second embodiment is the same as that of the first embodiment described above, so only the different parts from the first embodiment will be described below.

First, in the second embodiment, the water supply channel switching valve 44 and the electromagnetic on-off valve 42 in the first embodiment are not provided, but the rim-side electromagnetic on-off valve 80 is provided in the rim-side water supply channel 46, and the tank-side water supply Tank-side electromagnetic on-off valves 82 are provided in each of the passages 48 . These rim-side electromagnetic on-off valve 80 and tank-side electromagnetic on-off valve 82 function as drive valves, and are opened and closed by the controller 66, and the opening degree of the valve body is controlled in multiple stages.

In the second embodiment, the controller 66 drives the rim-side electromagnetic on-off valve 80 and the tank-side electromagnetic on-off valve 82, thereby enabling "normal cleaning mode", "trial run mode", and "water supply mode" can be executed.

Next, with reference to FIG. 8, a flush toilet according to a third embodiment (hereinafter referred to as third embodiment) of the present invention will be described. FIG. 8 is an overall configuration diagram of a flush toilet according to a third embodiment of the present invention.
The basic configuration of the flush toilet according to the third embodiment is the same as that of the first embodiment described above, so only the different parts from the first embodiment will be described below.

First, in the third embodiment, the water storage tank 6 and the pressurizing pump 8 in the first embodiment are not provided, and the downstream side of the water supply channel switching valve 44 is connected to the rim side water supply channel 46 and the jet side water supply channel 54. It is connected. The downstream end of the jet-side water supply channel 54 is connected to the jet water conduit 22, and cleaning water is spouted from the jet spout 26 by the water supply pressure of the water supply.

In the third embodiment, the controller 66 drives the water supply channel switching valve 44 to execute the "normal cleaning mode," "trial run mode," and "water supply mode" similarly to the first embodiment described above. It is now possible to do so.

Hereinafter, the effects of the flush toilet according to the present embodiment described above will be explained.
In the flush toilet 1 according to the present embodiment, when the controller 66 receives the flushing start signal, the controller 66 controls the water supply channel switching valve 44 (or the electromagnetic on-off valves 80, 82), which is a driving valve, to control the rim side A normal cleaning mode (first cleaning mode) S4 in which cleaning water is supplied to the water supply channel 46, and a test run mode (second mode) in which cleaning water is supplied to the rim side water supply channel 46 after the cleaning water is supplied to the tank side water supply channel 48. (cleaning mode) S6, and the controller 66 switches to the normal cleaning mode or the test run mode based on the water level in the water storage tank 6.

In this embodiment, there is a normal cleaning mode in which cleaning water is supplied to the rim-side water supply channel 46, and a trial run in which cleaning water is supplied to the tank-side water supply channel 48 and then to the rim-side water supply channel 46. Since the controller 66 switches to the normal cleaning mode or the test run mode based on the water level in the water storage tank 6, for example, when the water storage tank 6 is empty and the toilet is being flushed for the first time (the past flushing frequency data is (including when the current number of cleanings is determined to be the first after being reset), the mode is automatically switched to trial run mode, and after supplying cleaning water to the tank side water supply channel 48, the cleaning water is supplied to the rim side water supply channel 46. Let it be supplied. Thereby, the air present in the main water supply channel 32 upstream of the water supply channel switching valve 44 (or the electromagnetic on-off valves 80, 82) and the electromagnetic on-off valve 42 can be discharged into the water storage tank 6. Therefore, when flushing the toilet bowl for the first time, it is possible to prevent the flushing water spouted from the rim spout 20 from scattering outside the toilet bowl due to the air hammer phenomenon.

Further, in this embodiment, the water supply channel switching valve 44 (or the electromagnetic on-off valves 80, 82) is set to supply cleaning water to the rim side water supply channel 46 in a standby state before receiving the cleaning start signal. has been done. In this embodiment, for example, in the event of a power outage or when the water supply channel switching valve 44 (or the electromagnetic on-off valves 80, 82) breaks down, the toilet bowl can be flushed by manually opening the electromagnetic on-off valve or the like. Furthermore, since the cleaning water can be discharged from the rim spout 20, it is possible to prevent water from overflowing and leaking.

Further, in the present embodiment, the controller 66 controls the water supply channel so as to supply cleaning water to the rim side water supply channel 46 after the water level in the water storage tank 6 reaches a predetermined water level L3, which is a full water state, in the test run mode. Controls the switching valve 44 (or electromagnetic on-off valves 80, 82). In this embodiment, in the test run mode, the water supply channel switching valve 44 ( Alternatively, the air present in the main water supply channel 32 upstream of the electromagnetic on-off valves 80, 82) and the electromagnetic on-off valve 42 can be reliably discharged into the water storage tank 6.

Further, in this embodiment, the controller 66 switches to the normal cleaning mode or the test run mode based on the water level in the water storage tank 6 and the number of times of current cleaning or the usage time interval since the previous cleaning. If the current number of cleanings is greater than a predetermined number of times or the usage time interval is shorter than a predetermined time, control is performed so as not to switch to the test run mode. In this embodiment, unless the toilet is flushed for the first time or the toilet has not been used for a long time due to a water outage, etc., the trial run mode is not executed and the normal flushing mode is executed to flush the toilet. Can be done.

Further, in this embodiment, the predetermined number of times of cleaning to execute the test run mode is the first time. In this embodiment, the test run mode can be executed when flushing the toilet bowl for the first time.

Further, in the present embodiment, the controller 66 resets the past number of flushes when the supply of power or the supply of flushing water to the flush toilet 1 is stopped or reduced. In this embodiment, in order to execute the test run mode in the event of a power outage or water outage, it is necessary to prevent the flushing water spouted from the rim spout 20 from scattering outside the toilet bowl due to the air hammer phenomenon that occurs at the time of restoration. Can be done.

In addition, in the flush toilet 1 according to the present embodiment, the controller 66 controls the water supply channel switching valve 44 to supply flush water to the rim side water supply channel 46 when the controller 66 receives the flush start signal. mode, and a test run mode in which cleaning water is supplied to the jet side water supply channel 54 and then to the rim side water supply channel 46. Switch to normal cleaning mode or trial run mode based on

In this embodiment, there is a normal cleaning mode in which cleaning water is supplied to the rim side water supply channel 46, and a trial run in which cleaning water is supplied to the rim side water supply channel 46 after the wash water is supplied to the jet side water supply channel 54. The controller 66 switches to the normal cleaning mode or trial run mode based on the number of current flushes or the usage time interval since the previous flush. For example, when flushing the toilet for the first time, the controller 66 automatically switches to the trial run mode. After the cleaning water is supplied to the jet side water supply channel 54, the cleaning water is supplied to the rim side water supply channel 46. Thereby, the air present in the main water supply channel 32 upstream of the water supply channel switching valve 44 and the electromagnetic on-off valve 42 can be discharged to the jet side water supply channel 54. Therefore, when flushing the toilet bowl for the first time, it is possible to prevent the flushing water spouted from the rim spout 20 from scattering outside the toilet bowl due to the air hammer phenomenon.

In the embodiment described above, the flush toilet is a toilet that discharges jet water, but the present invention is not limited to this, and the present invention can be applied to a toilet that does not discharge jet water but only discharges water from the rim. . In this case, similar to the first embodiment, the flush toilet includes a water storage tank and a pressure pump, and is configured such that the water supply channel on the downstream side of the pressure pump is connected to the rim spout.

Further, in the present embodiment described above, the controller switches to the normal cleaning mode or the test run mode based on the water level in the water storage tank, the number of times of current cleaning, or the usage time interval since the previous cleaning, but the controller is not limited to these. Normal cleaning mode, commissioning mode, watering mode, or other multiple modes based on the water level in the water storage tank, the number of current cleanings or usage time since the last cleaning, or other conditions. You may switch to

The present invention can be applied to a flush toilet that does not include a pressure pump and only includes a water storage tank. Further, the present invention can also be applied to a flush toilet equipped with a gravity type tank. Further, the present invention can be applied to a flush toilet equipped with a jet pump that continuously supplies a large flow of flush water to the toilet main body for a predetermined period of time.

1 Flush toilet 2 Toilet main body 6 Water storage tank 8 Pressure pump 10 Bowl part 12 Rim part 14 Drain trap part 20 Rim spout 26 Jet spout 32 Main water supply channel 42 Electromagnetic shut-off valve 44 Water supply channel switching valve 46 Rim side water supply channel 48 Tank side water supply channel 50 Pump side water supply channel 54 Jet side water supply channel 66 Controller (control unit)

Claims (7)

A flush toilet that can be switched to multiple cleaning modes,
A bowl portion for receiving dirt, a rim portion located on the upper edge of the bowl portion and having an inner circumferential surface, a rim spout spout for discharging cleaning water along the inner circumferential surface of the rim portion, and a bottom portion of the bowl portion. a toilet body including a drain trap portion extending from the drain trap portion for discharging waste;
A main water supply channel that supplies flushing water from the water supply source into the toilet body, a rim-side water supply channel that branches from the main water supply channel and guides the flushing water to the rim spout, and a downstream branch that branches from the main water supply channel. a tank-side water supply channel that guides cleaning water to a water storage tank provided in the tank;
a drive valve that supplies wash water from the main water supply channel to the rim side water supply channel and/or the tank side water supply channel;
a control unit that controls the drive valve based on a cleaning start signal;
When the control unit receives the cleaning start signal, the control unit controls the driving valve to set a first cleaning mode in which cleaning water is supplied to the rim side water supply channel, and a first cleaning mode in which cleaning water is supplied to the tank side water supply channel. a second cleaning mode that supplies cleaning water to the rim side water supply channel after supplying the cleaning water;
The flush toilet is characterized in that the control unit switches to the first cleaning mode or the second cleaning mode based on the water level in the water storage tank. The flush toilet according to claim 1, wherein the drive valve is set to supply flush water to the rim side water supply channel in a standby state before receiving the flush start signal. 2. The control unit controls the drive valve in the second cleaning mode to supply cleaning water to the rim side water supply channel after the water level in the water storage tank reaches a predetermined water level. 2. The flush toilet described in 2. The control unit switches to the first cleaning mode or the second cleaning mode based on the water level in the water storage tank and the number of times of current cleaning or the usage time interval since the previous cleaning;
The control unit controls not to switch to the second cleaning mode when the current number of cleanings is more than a predetermined number of times or when the usage time interval is shorter than a predetermined time. Flush toilet. The flush toilet according to claim 4, wherein the predetermined number of times is a first time. The flush toilet according to claim 4 or 5, wherein the control unit resets the number of past flushes when the supply of power or the supply of flush water to the flush toilet is stopped or reduced. A flush toilet that can be switched to multiple cleaning modes,
A bowl portion for receiving dirt, a rim portion located on the upper edge of the bowl portion and having an inner circumferential surface, a rim spout spout for discharging cleaning water along the inner circumferential surface of the rim portion, and a bottom portion of the bowl portion. a toilet main body comprising: a drain trap section extending from the bowl section to discharge filth; and a jet water discharging section located at the bottom of the bowl section and discharging wash water toward the inlet of the drain trap section;
A main water supply channel that supplies flushing water from the water supply source into the toilet main body, a rim-side water supply channel that branches from the main water supply channel and guides the flushing water to the rim spout, and a rim-side water supply channel that branches from the main water supply channel and leads to the above-mentioned rim spout. a jet side water supply channel that guides cleaning water to the jet water discharge section;
a drive valve that supplies wash water from the main water supply channel to the rim side water supply channel and/or the jet side water supply channel;
a control unit that controls the drive valve based on a cleaning start signal,
When the control unit receives the cleaning start signal, the control unit controls the drive valve to select a first cleaning mode in which cleaning water is supplied to the rim side water supply channel, and a first cleaning mode in which cleaning water is supplied to the jet side water supply channel. and a second cleaning mode in which the cleaning water is supplied to the rim side water supply channel after being supplied with the cleaning water,
The flush toilet is characterized in that the control unit switches to the first cleaning mode or the second cleaning mode based on the number of times of current cleaning or the usage time interval from the previous cleaning.

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