Water closet

Abstract

To provide a water closet that washes a toilet bowl by rim water discharge, capable of reducing size of a washing water tank and discharging a sufficient amount of washing water to a toilet bowl body.SOLUTION: A water closet 1 comprises: a toilet bowl body 2 that has a bowl part 2a, a rim part 2c and a rim water discharge port 2f for discharging supplied washing water to the rim part 2c; a washing water tank device 4; a pump device 6; a water supply device 8; and a control device 10. The control device 10 can execute a washing mode in which a total amount of washing water discharged to the rim water discharge port 2f by the pump device 6 is larger than tank capacity of the washing water tank device 4, and the control device 10 is configured to control drive of the pump device 6 and the water supply device 8 in the washing mode so that at least a part of a water supply period in which washing water is supplied by the water supply device overlaps with a discharge period in which washing water is discharged by the pump device 6.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a flush toilet. [Background technology]

[0002] 2. Description of the Related Art Flush toilet devices are known in the art that use a pump device to discharge flush water stored in a flush water tank into a toilet body to flush the toilet body.

[0003] As an example of such a flush toilet device, Patent Document 1 discloses a flush toilet configured to use water supply pressure to spout tap water (flush water) supplied from a water pipe from a rim spout formed in the rim portion of the toilet body, and to pressurize flush water stored in a flush water tank using a pump device to spout it from a jet spout formed in the bottom of the bowl portion.

[0004] Furthermore, for example, Patent Document 2 discloses a flush toilet configured such that flush water in a tank is pressurized by an electric pump and discharged from a rim spout. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2009-30405 A [Patent Document 2] JP 2014-114627 A Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, there has been a demand for making flush toilets more compact in order to improve design. In order to make flush toilets more compact, it is possible to downsize the flush water tank for storing flush water. However, if the flush water tank is made smaller, the amount of water that can be stored in the flush water tank will decrease, and the amount of flush water discharged into the toilet body will decrease. If the amount of flush water discharged into the toilet body decreases, there is a risk that wastewater will not be able to be sufficiently discharged. For this reason, some municipalities have set the amount of flush water to be discharged into the toilet body, and if the flush water tank is made smaller, it will not be possible to discharge the set amount of flush water.

[0007] The present invention has been made in consideration of the above problems, and has as its object to provide a flush toilet that uses rim water spouting to flush the bowl, which allows for a compact flush water tank and is able to spout a sufficient amount of flush water into the bowl body. [Means for solving the problem]

[0008] The present invention is a flush toilet that is flushed with flushing water to discharge waste, and comprises a toilet body having a bowl portion for receiving waste, a rim portion formed on the upper edge of the bowl portion, and a rim outlet that discharges supplied flushing water into the rim portion; a flushing water tank for storing flushing water for flushing the toilet body; a pump device configured to supply the flushing water in the flushing water tank to the toilet body; a water supply device configured to supply flushing water into the flushing water tank; and a control device that controls the operation of the pump device and is also capable of controlling the supply of flushing water from the water supply device, wherein the control device is capable of executing a flushing mode in which the total amount of flushing water discharged by the pump device into the rim outlet is greater than the tank capacity of the flushing water tank, and the control device is configured to control the operation of the pump device and the water supply device so that, in the flushing mode, at least a portion of the water supply period in which flushing water is supplied by the water supply device overlaps with a discharge period in which flushing water is discharged by the pump device. According to the present invention configured as above, the control device controls the operation of the pump device and the water supply device in flush mode so that a part of the water supply period in which flush water is supplied by the water supply device overlaps with a discharge period in which flush water is discharged by the pump device. This makes it possible to discharge a sufficient amount of flush water, which is larger than the tank capacity of the flush water tank, from the rim spout of the toilet body, even if the flush water tank is made compact.

[0009] In the present invention, the toilet body is preferably configured to spout flush water only from the rim spout. For example, when water is discharged from the rim water outlet and the jet water outlet in combination as in Patent Document 1, flush water supplied from the tank device is discharged from the jet water outlet, and flush water supplied from the water pipe is discharged from the rim water outlet, so that a sufficient amount of flush water can be discharged to the toilet body even if the capacity of the tank device is small. However, in a configuration in which flush water is discharged only from the rim water outlet as in the present invention, flush water supplied from the water pipe and flush water supplied from the tank device cannot be discharged simultaneously. In contrast, according to the present invention having the above configuration, the drive of the pump device and the water supply device is controlled so that at least a part of the water supply period in which flush water is supplied by the water supply device overlaps with at least a part of the discharge period in which flush water is discharged by the pump device. As a result, not only the amount of water stored in the tank device but also the flush water supplied by the water supply device can be discharged in one flush operation, so that a sufficient amount of flush water can be discharged to the toilet body even in a case in which flush water is discharged only from the rim water outlet.

[0010] In the present invention, the control device is preferably configured to simultaneously start the supply of wash water by the water supply device and the discharge of wash water by the pump device in the wash mode. According to the present invention configured as described above, the supply of flushing water by the water supply device and the discharge of flushing water by the pump device are started simultaneously, so that the discharge of flushing water can be completed in the shortest possible time, and the time it takes for the tank device to become full after water is discharged into the toilet body can be shortened.

[0011] In the present invention, preferably, the flush water tank has an open portion that is open to the outside, and in flush mode, the instantaneous flow rate (L / min) of flush water discharged by the pump device into the toilet body is greater than the instantaneous flow rate (L / min) of flush water supplied to the flush water tank by the water supply device. The flush water tank has an open part that is open to the outside to separate it from the upstream side (the water supply device side). Therefore, if the supply of flush water by the water supply device and the discharge of flush water by the pump device are started simultaneously, there is a risk of water leaking to the outside from the open part. In contrast, according to the present invention configured as described above, the instantaneous flow rate (L / min) of flush water discharged into the toilet body by the pump device is greater than the instantaneous flow rate (L / min) of flush water supplied to the flush water tank by the water supply device, so that even if the supply of flush water by the water supply device and the discharge of flush water by the pump device are started simultaneously, water can be prevented from leaking to the outside from the open part.

[0012] In the present invention, preferably, an overflow passage is connected to the flush water tank, and the overflow passage communicates with the rim spout. According to the present invention configured as described above, because an overflow path is formed, when an open part is formed in the flush water tank, leakage from the open part can be more reliably prevented. Furthermore, even if the supply of flush water by the water supply device begins before the discharge of flush water by the pump device, leakage from the open part can be reliably prevented.

[0013] In the present invention, preferably, the flush toilet further has a float switch that is provided in the flush water tank and is capable of sending a detection signal to the control device when it detects that the flush water in the flush water tank is at or above a predetermined water level, and the control device is configured to stop driving the water supply device when it receives a detection signal from the float switch. Even if a float switch is provided, if the instantaneous discharge flow rate and the instantaneous water supply flow rate are approximately equal, the water level in the flush water tank will not drop much, and the float switch will continue to send a detection signal, which may make it impossible to stop the operation of the water supply device based on the detection signal from the float switch. In contrast, according to the present invention configured as described above, in flush mode, the supply of flush water by the water supply device and the discharge of flush water by the pump device are started simultaneously, and since the instantaneous discharge flow rate is greater than the instantaneous water supply flow rate, the flush water level in the flush water tank will drop reliably. As a result, the float switch will stop sending a detection signal, so the operation of the water supply device can be stopped based on the detection signal from the float switch.

[0014] In the present invention, the control device is preferably configured to stop water supply by the water supply device when a predetermined time has elapsed since the water supply device started to supply water. According to the present invention having the above configuration, even if the float switch breaks down, for example, water supply can be stopped reliably to prevent water leakage. Effect of the Invention

[0015] According to the present invention, a flush toilet is provided that allows for a compact flush water tank and is capable of discharging a sufficient amount of flush water into the toilet body. [Brief description of the drawings]

[0016] [Figure 1] 1 is an overall configuration diagram showing a toilet apparatus according to a first embodiment of the present invention. [Diagram 2] 5 is a flow chart showing the driving of each functional part in a first flushing mode in a toilet apparatus according to a first embodiment of the present invention. [Diagram 3] 6 is a flow chart showing the driving of each functional part in the first flush mode when the float switch in the flush toilet according to the first embodiment of the present invention fails. [Figure 4]13 is a flow chart showing the driving of each functional part in a first flushing mode in a toilet apparatus according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] A toilet apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0018] First Embodiment Fig. 1 is an overall configuration diagram showing a toilet apparatus according to a first embodiment of the present invention. As shown in Fig. 1, the toilet apparatus 1 according to the first embodiment of the present invention is a flush toilet apparatus that uses flush water to expel waste and flush the toilet. The toilet apparatus 1 comprises a toilet body 2, a flush water tank apparatus (flush water tank) 4 arranged behind the toilet body 2, a pump apparatus 6 that supplies flush water stored in the flush water tank apparatus 4 to the toilet body 2, a water supply apparatus 8 that supplies flush water to the flush water tank apparatus 4, and a control device 10.

[0019] The toilet body 2 is made of ceramic and comprises a bowl portion 2a for receiving waste, a drain trap pipe 2b extending from the bottom of the bowl portion 2a to drain the waste within the bowl portion 2a, and a rim portion 2c formed on the upper edge of the bowl portion 2a. A rim water conduit 2d is formed on one lateral side at the rear of the toilet body 2, and a water supply pipe 12 extending from a pump device 6 is connected to the rim water conduit 2d. The drain trap pipe 2b is also connected to a sewer system (not shown).

[0020] Flush water supplied from the pump device 6 to the rim water conduit 2d through the discharge pipe 14 is discharged into the bowl section 2a from the rim water outlet 2f at the downstream end of the rim water conduit 2d, and a toilet flush (so-called toilet flushing with 100% rim water discharge) is performed. The flush water discharged from the rim water outlet 2f into the bowl section 2a passes through the drain trap pipe 2b together with sewage and is drained into the sewer. Note that the toilet body 2 of this embodiment is provided with only the rim water outlet 2f as a water outlet, and flush water is discharged only from the rim water outlet 2f. Note that in this embodiment, flush water is discharged only from the rim water outlet 2f, but other water outlets may be provided, such as providing a jet water outlet in the drain trap pipe 2b and discharging water from the rim water outlet and the jet water outlet.

[0021] The water supply device 8 includes a stop valve 30 provided in a water supply pipe 12 connected to a water pipe (not shown), a constant flow valve 32 provided downstream of the stop valve 30, and an electromagnetic opening / closing valve 34 provided downstream of the constant flow valve 32. The water supply pipe 12 is connected to the flush water tank device 4 downstream of the water supply device 8.

[0022] The stop valve 30 is a valve for stopping the supply of tap water (wash water) from a water pipe. The constant flow valve 32 is a valve for adjusting the flow rate of the cleaning water supplied from the water pipe to a constant value.

[0023] The electromagnetic on-off valve 34 is a valve that can be electromagnetically opened and closed, and when the electromagnetic on-off valve 34 is opened, flush water is supplied to the flush water tank device 4. The electromagnetic on-off valve 34 is electrically connected to the control device 10, and can be switched between an open and closed state by the control device 10.

[0024] The flush water tank apparatus 4 comprises a connecting unit 20 and a tank unit 22. At least its lower part is attached to the upper rear part of the toilet body 2. The flush water tank apparatus 4 is a so-called low silhouette tank which, when attached to the toilet body 2, is formed so that its own height is relatively low.

[0025] The connecting unit 20 includes a water receiving housing 24 (small tank), an overflow pipe 26, and a check valve . Water receiving housing 24 has a lower opening 24a formed on the lower side, and an overflow port 24b formed on the side. Also, an open section 24c that is open to the outside is formed in at least a part of the upper part of water receiving housing 24. Because water receiving housing 24 has open section 24c that communicates with the outside, air can enter from the outside, and the water on the water supply pipe 12 side and the flush water in flush water tank device 4 can be separated.

[0026] The water receiving housing 24 has a lower opening 24a which is detachably connected to an upper opening 42a of the water storage tank 42 of the tank unit 22. In addition, the water supply pipe 12 penetrates the side wall of the water receiving housing 24 and extends to the inside, and flush water supplied through the water supply pipe 12 is discharged into the water receiving housing 24.

[0027] An overflow pipe 26 is connected to the overflow port 24b, and an overflow passage extending to the discharge pipe 14 is formed therein. A check valve 28 is attached to the overflow port 24b. The check valve 28 allows flush water in the water receiving housing 24 to flow from the overflow port 24b into the overflow pipe 26, while preventing the flush water in the overflow pipe 26 from flowing back into the water receiving housing 24. With this configuration, when the flush water in the water receiving housing 24 reaches the height of the overflow port 24b, the flush water in the water receiving housing 24 passes through the overflow port 24b and is discharged into the toilet body 2 via the overflow pipe 26 and the discharge pipe 14. The check valve 28 prevents the flush water in the discharge pipe 14 from flowing back into the water receiving housing 24.

[0028] The tank unit 22 includes a water storage tank 42 and a float switch 40 . The water storage tank 42 is a tank that can store flush water, and has an upper opening 42a formed at the top. The upper opening 42a of the water storage tank 42 is connected to the lower opening 24a of the water receiving housing 24. Flush water supplied from the water supply pipe 12 to the water receiving housing 24 is supplied to the water storage tank 42 through the lower opening 24a.

[0029] The float switch 40 is installed at the top of the water storage tank 42, and detects the upper specified water level that is the reference for the full water level. The float switch 40 is electrically connected to the control device 10, and when the water level in the water storage tank 42 rises and reaches the upper specified water level, it transmits a detection signal indicating that the upper specified water level has been reached. When the control device 10 receives this detection signal, it can determine that the flush water tank is almost full. The upper specified water level is the full water level, which is the stop water level of the water storage tank 42 that is specified for normal flushing. Note that in this embodiment, the tank capacity refers to the amount of flush water stored in the water storage tank 42 when water is stored in the water storage tank 42 up to this full water level, but is not limited to this, and may be, for example, the limit amount that can be stored in the tank device 4 (i.e., the amount of water stored when the water level reaches the overflow port 24b).

[0030] The pump device 6 includes an electric pump 50 and a water intake pipe 52 connected to the electric pump 50. The water intake pipe 52 is connected to the electric pump 50 on the water intake side, and the water discharge pipe 14 is connected to the water discharge side. The water intake pipe 52 penetrates the side wall of the water storage tank 42, entering inside and extending to the bottom. The electric pump 50 draws up flush water in the water storage tank 42 from the water intake pipe 52, and supplies it to the toilet body 2 through the water discharge pipe 14. The pump device 6 is electrically connected to the control device 10, and is switched between a drive state and a stop state by the control device 10. The amount of flush water discharged per hour from the water storage tank 42 by the electric pump 50 (instantaneous discharge flow rate (L / min)) is almost constant regardless of time, and is greater than the amount of flush water supplied per hour from the water supply device 8 to the tank device 4 (instantaneous supply water flow rate (L / min)).

[0031] The control device 10 includes, for example, a control circuit 60 having a CPU and memory, and a remote control 61 capable of communicating with the control circuit 60 wirelessly or via wired communication, and is realized by the CPU in the control circuit 60 executing a program stored in the memory in response to an input to the remote control 61.

[0032] The control circuit 60 of the control device 10 is electrically connected to the electromagnetic on-off valve 34 of the water supply device 8, and can control the water supply of the water supply device 8. Specifically, the control circuit 60 can switch between a state in which the water supply by the water supply device 8 is stopped and a state in which the water supply device 8 supplies water to the tank device 4 by switching the electromagnetic on-off valve 34 between open and closed.

[0033] Furthermore, the control circuit 60 of the control device 10 is electrically connected to the electric pump 50 of the pump device 6, and is capable of controlling the operation of the pump device 6. Specifically, the control circuit 60 can switch between a drive state in which flush water is supplied from the tank device 4 to the toilet body 2 by supplying electrical power to the electric pump 50 to drive the electric pump 50, and a stop state in which the supply of electrical power to the electric pump 50 is stopped and the electric pump 50 is stopped.

[0034] In this embodiment, the control device 10 can set flush modes that differ in the amount of flush water discharged into the toilet body 2 in response to an input from the remote control 61. Specifically, the control device 10 can execute a first flush mode in which the total amount of flush water discharged into the toilet body 2 by the pump device 6 is greater than the tank capacity of the flush water tank, and a second flush mode in which the total amount of flush water discharged into the toilet body 2 by the pump device 6 is less than the tank capacity of the flush water tank. Note that the first flush mode does not necessarily correspond to a large flush and the second flush mode to a small flush; for example, the large flush may be set to either the first or second flush mode so that the amount of flush water set by each local government can be secured, and a third flush mode, which has a smaller total amount discharged than the second flush mode, may be set to a small flush.

[0035] The flow of the first flush mode in the toilet apparatus 1 of the first embodiment will be explained below. FIG. 2 is a flow chart showing the driving of each functional part in the first flushing mode in the toilet apparatus of the first embodiment according to the present invention. time t 0 ~t 1 The toilet apparatus 1 is in a standby state. In this standby state, the electromagnetic on-off valve 34 of the water supply apparatus 8 is closed (OFF), and the electric pump 50 of the pump device 6 is stopped (OFF). Additionally, flush water is stored in the water storage tank 42 of the tank device 4 up to the full water level, and the float switch is ON.

[0036] t 1 When an input to execute the first cleaning mode is made to the remote control 61, the control circuit 60 of the control device 10 detects a time t12 that has elapsed since the input to execute the first cleaning mode. 2 In this case, power supply to the electric pump 50 is started for a predetermined time (t 2 ~t 3 ) the electric pump 50 is in an activated state, and although power is being supplied, the electric pump 50 is not actually driven. 3 When the electric pump 50 of the pump device 6 is activated, flush water in the water storage tank 42 of the tank device 4 is supplied to the toilet body 2 through the water discharge pipe 14 and discharged from the rim water discharge port 2f. 3 At this time, the control circuit 60 of the control device 10 switches the electromagnetic on-off valve 34 of the water supply device 8 to the open state (ON). This initiates the supply of flush water from the water supply device 8 to the tank device 4. The flush water supplied to the water supply device 8 is supplied to the water storage tank 42 via the water receiving housing 24. Here, when the water supply device 8 is in the open state and the electric pump 50 is driven, the instantaneous discharge flow rate FP (L / min) of flush water discharged from the water storage tank 42 by the electric pump 50 to the toilet body 2 is greater than the instantaneous supply flow rate FT (L / min) of flush water supplied to the tank device 4 by the water supply device 8. For this reason, the level of flush water in the water storage tank 42 begins to drop, and at time t 4 The float switch turns OFF.

[0037] Then, the electric pump 50 starts supplying water (t 3 ) after a predetermined time T35 has elapsed (or after the time t 1 After a certain time has elapsed since time t 5 In the first cleaning mode, the control circuit 60 stops the power supply to the electric pump 50 (the pump device is turned off). 3 ~t 5 The total amount of flush water discharged into the toilet body 2 at t 5 -t 3 )) is set to be larger than the tank capacity of the tank device.

[0038] And at time t 5 When the electric pump 50 is stopped at time t 6 When the level of flush water in the water storage tank 42 reaches close to the full water level, the float switch 40 turns ON and sends a detection signal from the float switch 40 to the control circuit 60 indicating that the full water level has been detected.

[0039] The control circuit 60 receives a detection signal from the float switch 40 (t 6 ) after a certain time T67 has elapsed, 7 At this time, the electromagnetic on-off valve 34 of the water supply device 8 is closed, stopping the supply of flush water to the tank device 4. The toilet device 1 then returns to the standby state.

[0040] In this manner, in this embodiment, the water supply period t 3 ~t 7 and a discharge period t during which flush water is discharged from the tank device 4 to the toilet body 2 by the pump device 6. 3 ~t 5 At time t 3 ~t 5 They overlap in .

[0041] In the second flushing mode, in which the total amount of flush water discharged by the pump device 6 into the toilet body 2 is smaller than the tank capacity of the flush water tank, the water supply period by the water supply device and the discharge period by the pump device may be shortened. Note that in the second flushing mode, the water supply period t 1 ~t 7 and a discharge period t during which flush water is discharged from the tank device 4 to the toilet body 2 by the pump device 6. 3 ~t 5 and do not need to overlap, and flush water may be discharged from the tank device into the toilet body 2, and then flush water may be supplied to the tank device by the water supply device.

[0042] In the above explanation, the control circuit 60 closes the electromagnetic valve 34 of the water supply device 8 when a predetermined time has elapsed after receiving a detection signal from the float switch 40. However, the control circuit 60 in this embodiment is configured to close the electromagnetic valve 34 of the water supply device 8 when a predetermined time has elapsed after the pump device 6 is stopped, in the event that the float switch 40 fails, for example.

[0043] 3 is a flow chart showing the driving of each functional unit in the first flush mode when the float switch in the flush toilet according to the first embodiment of the present invention fails. 5 The flow up to this point is the same as that explained with reference to FIG. 2, so the explanation will be omitted.

[0044] When the float switch fails, the pump device 6 is stopped at time t 5 Even after that, the float switch 40 does not turn ON. In such a case, the control circuit 60 determines whether the pump device 6 is stopped at time t 5 When a predetermined time T58 has elapsed from time t 8At time t , the electromagnetic on-off valve 34 of the water supply device 8 is closed, and the supply of cleaning water to the tank device 4 is stopped. This makes it possible to stop the supply of cleaning water to the tank device 4 even if the float switch 40 breaks down. 5 The electromagnetic valve 34 of the water supply device 8 is closed from time t 8 The time T58 is the time t 5 From 7 is set longer than the time.

[0045] The first embodiment of the present invention provides the following advantages. According to this embodiment, in the first flushing mode, the water supply device 8 supplies flushing water during a water supply period t 1 ~t 7 A part of the cleaning water is discharged by the pump device 6 during the discharge period t 3 ~t 5 By controlling the operation of the pump device 6 and the water supply device 8 so as to overlap with the above, the tank device 4 can be made smaller and a sufficient amount of flushing water, which is greater than the tank capacity of the tank device 4, can be discharged from the rim water outlet 2f of the toilet body 2.

[0046] Also, according to this embodiment, the toilet body 2 is configured to spout flush water only from the rim water outlet 2f. When spouting from the rim water outlet and the jet water outlet is used in combination as in Patent Document 1, flush water supplied from the tank device is spouted from the jet water outlet, and flush water supplied from the water pipe is spouted from the rim water outlet, so that a sufficient amount of flush water can be spouted into the toilet body even if the capacity of the tank device is small. However, with a configuration such as this embodiment in which flush water is spouted only from the rim water outlet 2f, flush water supplied from the water pipe and flush water supplied from the tank device 4 cannot be discharged simultaneously. In contrast, according to this embodiment, the water supply period t during which flush water is supplied by the water supply device 8 is 1 ~t 7 A part of the cleaning water is discharged by the pump device 6 during the discharge period t 3 ~t 5In addition, because the operation of the pump device 6 and the water supply device 8 is controlled, not only the amount of water stored in the tank device 4 but also the flushing water supplied by the water supply device 8 can be discharged in one flushing operation, so that even in cases where flushing water is discharged only from the rim water outlet 2f, a sufficient amount of flushing water can be discharged into the toilet body 2.

[0047] Furthermore, according to this embodiment, the control device 10 is configured, in flush mode, to simultaneously start the supply of flush water by the water supply device 8 and the discharge of flush water by the pump device 6. Because the supply of flush water by the water supply device 8 and the discharge of flush water by the pump device 6 start simultaneously, the discharge of flush water can be completed in the shortest possible time, and the time until the tank device 4 becomes full after water is discharged into the toilet body 2 can be shortened.

[0048] Also, according to this embodiment, in this embodiment, the flush water tank apparatus 4 has an open section 24c that is open to the outside, and in the first flush mode, the instantaneous flow rate (L / min) of flush water discharged by the pump apparatus 6 to the toilet body 2 is greater than the instantaneous flow rate (L / min) of flush water supplied by the water supply apparatus 8 to the flush water tank apparatus 4. The flush water tank apparatus 4 has an open section 24c that is open to the outside in order to separate it from the upstream side (the water supply apparatus 8 side). For this reason, if the supply of flush water by the water supply apparatus 8 and the discharge of flush water by the pump apparatus 6 are started simultaneously, there is a risk of water leaking to the outside from the open section 24c. In contrast, according to this embodiment, the instantaneous flow rate (L / min) of flush water discharged by the pump apparatus 6 to the toilet body 2 is greater than the instantaneous flow rate (L / min) of flush water supplied by the water supply apparatus 8 to the flush water tank apparatus 4, so even if the supply of flush water by the water supply apparatus 8 and the discharge of flush water by the pump apparatus 6 are started simultaneously, water can be prevented from leaking to the outside from the open section 24c.

[0049] Furthermore, according to this embodiment, an overflow pipe 26 is connected below the open portion 24c of the water receiving housing 24 of the flush water tank device 4, and the overflow pipe 26 communicates with the rim spout through the discharge pipe 14. In this way, because the overflow pipe 26 is provided, even if the open portion 24c is formed in the water receiving housing 24 of the flush water tank device 4, water leakage from the open portion 24c can be more reliably prevented.

[0050] Also, according to this embodiment, there is a float switch 40 provided in the flush water tank device 4, and when the control device 10 receives a detection signal from the float switch 40, it stops the operation of the water supply device 8. Even if a float switch is provided, if the instantaneous discharge flow rate and the instantaneous water supply flow rate are approximately equal, the water level in the flush water tank does not drop much and the float switch continues to send a detection signal, so there is a risk that it will not be possible to stop the operation of the water supply device based on the detection signal from the float switch. In contrast, in this embodiment, in the first flush mode, the supply of flush water by the water supply device 8 and the discharge of flush water by the pump device 6 are started simultaneously, and since the instantaneous discharge flow rate is greater than the instantaneous water supply flow rate, the flush water level in the flush water tank device 4 drops reliably and the float switch 40 stops sending a detection signal, so it is possible to stop the operation of the water supply device 8 based on the detection signal from the float switch 40.

[0051] In this embodiment, the control device 10 is configured to stop water supply by the water supply device 8 when a predetermined time has elapsed since the start of water supply by the water supply device 8. This makes it possible to reliably stop water supply and prevent water leakage even if, for example, the float switch 40 breaks down.

[0052] In each of the above embodiments, the control device 10 controls the operation of the pump device and the water supply device so that a portion of the water supply period in which cleaning water is supplied by the water supply device 8 overlaps with a portion of the discharge period in which cleaning water is discharged by the pump device 6, but this is not limited to the above. The entire water supply period in which cleaning water is supplied by the water supply device 8 may overlap with a portion of the discharge period in which cleaning water is discharged by the pump device 6, or a portion of the water supply period in which cleaning water is supplied by the water supply device 8 may overlap with the entire discharge period in which cleaning water is discharged by the pump device 6, or the entire water supply period in which cleaning water is supplied by the water supply device 8 may overlap with the entire discharge period in which cleaning water is discharged by the pump device 6.

[0053] <Second embodiment> In the first embodiment described above, when an input to execute the first cleaning mode is made to the remote control 61, the control circuit 60 of the control device 10 first performs a 1 At time t 3 Discharge of cleaning water by the pump device 6 is started at this point. However, the present invention is not limited to this.

[0054] Fig. 4 is a flow chart showing the driving of each functional unit in the first flush mode in a toilet apparatus according to a second embodiment of the present invention. The overall configuration of the toilet apparatus in the second embodiment is similar to the toilet apparatus of the first embodiment described with reference to Fig. 1, but the driving of each functional unit in the first flush mode differs from that in the first embodiment.

[0055] time t 0 ´~t 1 ', the toilet device 1 is in a standby state. In this standby state, the electromagnetic on-off valve 34 of the water supply device 8 is closed (OFF), and the electric pump 50 of the pump device 6 is stopped (OFF). Additionally, flush water is stored in the storage tank 42 of the tank device 4 up to the full water level, and the float switch is ON.

[0056] t 1', when an input to execute the first flush mode is made to the remote control 61, the control circuit 60 of the control device 10 switches the electromagnetic on-off valve 34 of the water supply device 8 to the open state (ON). This initiates the supply of flush water from the water supply device 8 to the tank device 4. The flush water supplied to the water supply device 8 is supplied to the water storage tank 42 via the water receiving housing 24. When the water level in the tank device 4 rises and reaches the overflow port 24b of the water receiving housing 24, the supplied flush water is discharged from the overflow port 24b into the overflow pipe 26 and then discharged into the toilet body 2 via the water discharge pipe 14.

[0057] Then, when a predetermined time T12' has elapsed since the input to execute the first cleaning mode, 2 When the power supply reaches the preset value, the control circuit 60 starts supplying power to the electric pump 50. However, the power supply is continued for a predetermined time (t 2 ´~t 3 In the period t ′, the electric pump 50 is in an activated state, and although power is being supplied, the electric pump 50 is not actually driven. 3 At time t', the electric pump 50 of the pump device 6 is driven, and flush water in the water storage tank 42 of the tank device 4 is supplied to the toilet body 2 through the discharge pipe 14, and is discharged from the rim water outlet 2f. Here, when the water supply device 8 is in the open state and the electric pump 50 is driven, the instantaneous discharge flow rate FP (L / min) of flush water discharged from the water storage tank 42 to the toilet body 2 by the electric pump 50 is greater than the instantaneous supply flow rate FT (L / min) of flush water supplied to the tank device 4 by the water supply device 8. For this reason, the level of flush water in the water storage tank 42 begins to drop, and at time t 4 At this point, the float switch turns OFF.

[0058] Then, the electric pump 50 starts supplying water (t 3 When a predetermined time T35' has elapsed from the time t 1 After a certain time has elapsed since time t 5In the first cleaning mode, the control circuit 60 stops the power supply to the electric pump 50 (the pump device is turned off). 3 ´~t 5 ´) is the total amount of flush water discharged into the toilet body 2 during this drive time (i.e., FP (L / min) × (t 5 ´-t 3 ´)) is set to be larger than the tank capacity of the tank device.

[0059] And at time t 5 When the electric pump 50 is stopped at time t 6 In ', when the level of flush water in the water storage tank 42 reaches close to the full water level, the float switch 40 turns ON and a detection signal is sent from the float switch 40 to the control circuit 60 indicating that the full water level has been detected.

[0060] The control circuit 60 receives a detection signal from the float switch 40 (t 6 When a predetermined time T67' has elapsed from time t 7 At ', the electromagnetic on-off valve 34 of the water supply device 8 is closed, stopping the supply of flush water to the tank device 4. The toilet device 1 then returns to the standby state.

[0061] In this manner, in this embodiment, the water supply period t 1 ´~t 7 ', and a discharge period t during which flush water is discharged from the tank device 4 to the toilet body 2 by the pump device 6. 3 ´~t 5 ´ and time t 3 ´~t 5 ´ overlaps.

[0062] According to the above embodiment, in addition to the effects achieved in the first embodiment, the following effects are achieved. In this embodiment, the supply of flush water by the water supply device 8 begins before the discharge of flush water by the pump device 6, so there is a risk of flush water leaking from the flush water tank device 4. In contrast, according to this embodiment, since the overflow pipe 26 is connected to the water receiving housing 24, such leakage can be reliably prevented. [Explanation of symbols]

[0063] 1 Toilet device 2 Toilet bowl body 2a Bowl section 2b Drain trap pipe 2c Rim section 2d rim channel 2F Rim outlet 4. Cleaning water tank device 6. Pumping equipment 8 Water supply device 10 Control device 12 Water supply pipe 14 Water pipe 20 Connecting Units 22 Tank Unit 24 Water receiving housing 24a Lower opening 24b Overflow port 24c Open area 26 Overflow pipe 28 Check valve 30 Water stop valve 32 Constant flow valve 34 Solenoid valve 40 Float Switch 42 Water Tank 42a Upper opening 50 Electric Pump 52 Water intake pipe 60 Control circuit 61 Remote Control

Claims

1. A flush toilet that is flushed with flush water to expel waste, a toilet body having a bowl portion for receiving waste, a rim portion formed on an upper edge of the bowl portion, and a rim spout for spouting supplied flush water onto the rim portion; a flush water tank for storing flush water for flushing the toilet body; a pump device configured to supply flush water in the flush water tank to the toilet body; a water supply device configured to supply flush water into the flush water tank; A control device that controls the operation of the pump device and the supply of cleaning water from the water supply device, The control device is capable of executing a flush mode in which the total amount of flush water discharged by the pump device to the rim spout is greater than the tank capacity of the flush water tank, The control device is configured to control the operation of the pump device and the water supply device so that, in the cleaning mode, at least a portion of a water supply period in which cleaning water is supplied by the water supply device overlaps with at least a portion of a discharge period in which cleaning water is discharged by the pump device. A flush toilet characterized by:

2. The toilet body is configured to spout flush water only from the rim spout, The flush toilet according to claim 1.

3. The control device is configured to simultaneously start, in the cleaning mode, the supply of cleaning water by the water supply device and the discharge of cleaning water by the pump device. The flush toilet according to claim 1 or 2.

4. The flush water tank has an opening that is open to the outside, In the flushing mode, an instantaneous flow rate (L / min) of flush water discharged by the pump device to the toilet body is greater than an instantaneous flow rate (L / min) of flush water supplied by the water supply device to the flush water tank. The flush toilet according to claim 3.

5. An overflow passage is connected to the cleaning water tank, The overflow passage communicates with the rim spout. The flush toilet according to any one of claims 1 to 4.

6. The flush toilet further has a float switch that is provided in the flush water tank and is capable of sending a detection signal to the control device when it detects that the flush water in the flush water tank is at or above a predetermined water level, The control device is configured to stop driving the water supply device when the control device receives the detection signal from the float switch. The flush toilet according to claim 4.

7. The control device is configured to stop the water supply by the water supply device when a predetermined time has elapsed since the start of water supply by the water supply device. The flush toilet according to claim 6.

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