JP2020051227A - Water closet - Google Patents

Abstract

To provide a water closet capable of reliably preventing water leakage outside the device even in abnormal situations such as failure or freezing of a switching unit for switching water supply routes for supplying washing water to a rim water discharge port and a jet water discharge port.SOLUTION: A water closet 1 comprises: a switching unit 22 for switching water supply routes within a water supply channel 26 which makes it possible to supply washing water from a water storage tank 18 to a rim water discharge port 8a and a jet water discharge port 10a; and a controller 24 for controlling the revolution of a booster pump 20 for supplying the washing water from the water storage tank to the water supply channel. The switching unit includes a switching valve body 34 which mechanically operates under the hydraulic pressure of the washing water to which the pressure is applied by the booster pump and opens and closes a jet water supply channel which extends from the water supply channel to the jet water discharge port. A rim water supply channel which extends to the rim water discharge port is provided in the water supply channel 28 upstream of the switching valve body. The controller controls to reduce the revolution of the booster pump when the controller determines that the flow rate of the washing water passing through the rim water supply channel is larger than the prescribed flow rate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to flush toilets, and more particularly, to flush toilets that are flushed with pressurized flush water.

BACKGROUND ART Conventionally, flush toilets such as those described in Patent Documents 1 to 3 have been known as flush toilets that are washed with pressurized wash water.
First, in the conventional flush toilets described in Patent Literatures 1 and 2, rim water discharge is performed by directly supplying and discharging tap water to a rim water discharge port, while washing water stored in a tank is discharged. The bowl portion is washed by so-called “hybrid washing”, in which jet water is spouted by discharging the jet water from a jet spout port by pressurizing with a pump.
Further, in the conventional flush toilets described in Patent Documents 1 and 2 described above, water is supplied to a rim water discharge water supply path directly connected to a water supply and a tank in which jet water discharge water is stored. The water supply path for jet water discharge can be switched by an electric switching valve (such as an electromagnetic valve). The switching operation of the electric switching valve is performed by an electric signal under the control of the controller. Has become. Thereby, when the toilet flushing is started, first, rim spouting for spouting the washing water from the rim spout is performed, and then, while the rim spouting is continued, the washing water is spouted from the jet spout. Jet spouting is performed.
Further, in the conventional flush toilet described in Patent Literature 3, the flush water stored in the tank is pressurized by a pump, and the rim spout and jet spout are respectively performed only by the flush water pressurized by the pump. It is supposed to run. Further, in this flush toilet, the water discharge flow path of the wash water pressurized by the pump is switched to a water supply path for rim water discharge and a water supply path for jet water discharge by an electric switching valve (such as a solenoid valve). The switching operation of the electric switching valve is performed by an electric signal under the control of the controller.
Regarding the conventional flush toilet described in these Patent Documents 1 to 3, even when installed in a low water pressure area or place, the flush water stored in the tank is pressurized with a pump to discharge water. As a result, the flushing performance of the toilet can be ensured.

JP 2010-156201 A JP 2012-132167 A JP-A-2017-66758

However, in the conventional flush toilet described in Patent Documents 1 and 2 described above, a water supply path for rim water discharge by direct pressure of tap water and a water supply path for jet water discharge by pressurization of a pump are respectively provided. Since it is necessary to provide a means and a device for supplying water, the number of parts increases and the entire device becomes large.
In particular, in a rim spout water supply path for directly supplying tap water to the rim spout, it is preferable to dispose the switching valve at a position higher than the rim spout in consideration of the head pressure (so-called head pressure). However, when the switching valve is disposed at a position higher than the rim spout, a space in the height direction of the flush toilet is required, which is a factor that hinders downsizing of the device. .
In the conventional flush toilet described in Patent Document 3 described above, the height of the flush toilet is increased by a structure in which flush water pressurized by a common pump is supplied to a rim spout and a jet spout. Dimensions can be reduced. However, when switching from the water supply path for rim water discharge to the water supply path for jet water discharge by the switching valve, the jet water discharge from the water supply path for rim water discharge is performed for the wash water under a relatively large water pressure by the pressurizing pump. It is necessary to switch to the water supply route for
Therefore, in order to drive an electric switching valve (such as an electromagnetic valve) in a state where a relatively large water pressure is applied to the water supply path, a relatively large torque is required. However, there is a problem that the size is increased.

On the other hand, by operating the switching valve in advance in a state where a relatively low water pressure is applied, the torque required for the switching operation can be reduced. However, when the rotation speed of the pump is increased when the switching valve is fully opened, there is a problem that waste water not contributing to the generation of siphons may be generated, especially in jet water discharge.
Therefore, the present inventors have focused on a switching unit that switches a flow path by opening and closing a rim water discharge water supply path and a jet water discharge water supply path according to the water pressure in a water supply path generated by a pressurizing pump. However, for the purpose of realizing the miniaturization of the device including the switching unit, intensive development has been carried out.
However, for a switching mechanism such as a switching valve of a switching unit that switches a flow path by opening and closing a water supply path by water pressure, flow path switching is not performed until a predetermined or higher water pressure acts on the switching mechanism. Therefore, the washing water remains in the flow path.
Therefore, when such a switching unit is used in a cold region or the like, there is a problem that a switching mechanism such as a switching valve is frozen by washing water remaining in the flow path, which may cause a malfunction.
In addition, when the switching unit does not operate normally, the flow path is closed, and there is also a problem that the external pressure may increase due to an increase in the pressure in the water supply passage.

  Therefore, the present invention has been made to solve the above-described problems of the related art, and includes an abnormality such as a failure or freezing of a switching unit that switches a water supply path that supplies cleaning water to a rim water outlet or a jet water outlet. It is an object of the present invention to provide a flush toilet that can surely prevent water leakage outside the machine.

In order to solve the above-mentioned problem, the present invention is a flush toilet flushed with pressurized flush water, comprising a water storage tank for storing flush water, a bowl portion, and a rim spout for flushing flush water. A toilet body having a jet water outlet, a drain trap section, a water supply path for supplying washing water from the water storage tank to each of the rim water outlet and the jet water outlet, and a water supply path provided in the water supply path. A switching unit that switches a water supply path that supplies cleaning water to each of the rim water outlet and the jet water outlet, and a first cleaning step of first discharging cleaning water in the water supply channel from the rim water outlet. Then, the water supply path is cut so as to execute a second cleaning step of discharging the cleaning water in the water supply path from the jet water discharge port while continuing the water discharge from the rim water discharge port. And a pressurizing pump for pressurizing the washing water supplied from the water storage tank to the water supply passage and adjusting the flow rate of the washing water in the water supply passage. The pressurizing pump, which is adjustable so that the second flow rate of the cleaning water to be pumped in the second cleaning step is larger than the first flow rate of the cleaning water, and control for controlling the number of rotations of the pressurizing pump. Wherein the switching unit mechanically operates by receiving the pressure of the washing water pressurized by the pressurizing pump, and opens and closes a jet water supply passage extending from the water supply passage to the jet water discharge port. A switching valve element, and a rim water path extending to the rim water outlet is provided in the water supply path upstream of the switching valve element, and the control unit passes through the rim water path. The flow rate of cleaning water is larger than the specified flow rate If it is determined that is characterized by controlling so as to reduce the rotational speed of said pressurizing pump.
In the present invention configured as described above, by switching the water supply path by the switching unit, the first cleaning step is performed, and the rim water discharged from the rim water discharge port through the rim water supply path through the rim water supply path for the wash water in the water supply path. Execute. Thereafter, in the second cleaning step, rim / water discharge can be performed by performing jet water discharge in which the wash water in the water supply channel is also discharged from the jet water discharge port while continuing the rim water discharge.
Here, since the rim water supply passage for executing the rim water discharge in the first cleaning step and the second cleaning step is provided on the upstream side of the switching valve body, regardless of the open / close state of the switching valve body, The rim spout is always open.
Therefore, for example, in the second cleaning step, when the switching valve body is inadvertently closed due to a failure or freezing of the switching unit, the jet water is originally jetted from the jet water outlet through the jet water supply passage. As a result, a relatively large flow of wash water to be discharged flows into the rim water supply channel which is always open, and is discharged from the rim water discharge port.
Therefore, it is possible to prevent external water leakage due to an increase in the pressure in the water supply passage. Further, since there is no need to separately provide a flow path or the like for bypassing the washing water in the water supply channel, the size of the entire apparatus can be reduced.
Further, even in the case of an abnormality such as a failure or freezing of the switching unit, if the control unit determines that the flow rate of the washing water passing through the rim water supply passage is larger than a predetermined flow rate, the rotation speed of the pressurizing pump is determined. Can be controlled to decrease. Therefore, it is possible to prevent a large flow of washing water from being supplied from the rim spout to the bowl portion of the toilet body for a long time, and to suppress splashing of washing water from the bowl portion to the outside.
That is, when an abnormality is detected, the control unit detects the abnormality while suppressing the pressure in the water supply passage from increasing, and the supply amount of the wash water supplied from the pressurizing pump can be rapidly reduced. For this reason, it is possible to reliably suppress the flushing water from flowing out of the bowl portion.

In the present invention, preferably, the switching unit further includes an opening / closing detecting unit that detects whether the switching of the water supply path is performed by opening / closing the switching valve body. When it is determined that the flow rate of the washing water passing through the rim water supply passage is larger than a predetermined flow rate in accordance with the information detected by the detection unit, control is performed so as to reduce the rotation speed of the pressurizing pump.
In the present invention thus configured, since the switching unit includes the open / close detection unit that detects whether the water supply path is switched by opening / closing the switching valve body, the water supply path is opened / closed by the switching valve body. It is possible to accurately detect whether or not the switching is normally performed.
Accordingly, when an abnormality such as a failure or freezing of the switching unit occurs, the control unit determines that the flow rate of the washing water passing through the rim water supply passage is larger than the predetermined flow rate, and can stop the rotation of the pressurizing pump.
Therefore, in the event of an abnormality, it is possible to suppress the flush water of the water supply passage fed from the pressurizing pump from flowing into the toilet body at a large flow rate for a long time, and it is possible to reliably prevent external water leakage.

In the present invention, preferably, the rim water supply path includes a flow rate detection unit that detects a flow rate of the washing water flowing inside the rim water supply path, and the control unit controls the flow rate according to the information detected by the flow rate detection unit. When it is determined that the flow rate of the washing water passing through the rim water supply passage is larger than a predetermined flow rate, control is performed so as to reduce the rotation speed of the pressure pump.
In the present invention thus configured, since the rim water supply path includes the flow rate detection unit that detects the flow rate of the cleaning water flowing inside the rim water supply path, the switching of the water supply path normally operates by opening and closing the switching valve body. Can be accurately detected.
Accordingly, when an abnormality such as a failure or freezing of the switching unit occurs, the control unit determines that the flow rate of the washing water passing through the rim water supply passage is larger than the predetermined flow rate, and can stop the rotation of the pressurizing pump.
Therefore, in the event of an abnormality, it is possible to suppress the flush water of the water supply passage fed from the pressurizing pump from flowing into the toilet body at a large flow rate for a long time, and it is possible to reliably prevent external water leakage.

In the present invention, preferably, the water storage tank includes a water level detection unit that detects a water level of the washing water in the water storage tank, and the control unit performs the pressurization according to the information detected by the water level detection unit. Control is performed to reduce the number of revolutions of the pump.
In the present invention thus configured, since the water storage tank is provided with the water level detection unit that detects the level of the washing water inside the water storage tank, information on a decrease in the water level in the water storage tank detected by the water level detection unit is provided. Accordingly, it is possible to accurately detect whether the switching of the water supply path is operating normally by opening and closing the switching valve body.
Accordingly, when an abnormality such as a failure or freezing of the switching unit occurs, the control unit determines that the flow rate of the washing water passing through the rim water supply passage is larger than the predetermined flow rate, and can stop the rotation of the pressurizing pump.
Therefore, in the event of an abnormality, it is possible to suppress the flush water of the water supply passage fed from the pressurizing pump from flowing into the toilet body at a large flow rate for a long time, and it is possible to reliably prevent external water leakage.

  ADVANTAGE OF THE INVENTION According to the flush toilet of this invention, even in the case of abnormality, such as a failure of the switching part which switches the water supply path which supplies wash water to a rim water outlet or a jet water outlet, or freezing, etc., external leakage of water can be prevented reliably. .

1 is an overall schematic configuration diagram of a flush toilet according to a first embodiment of the present invention. It is a longitudinal section of a change valve device of a flush toilet by a 1st embodiment of the present invention, and shows a valve-closing state. It is a longitudinal section of a switching valve device of a flush toilet by a 1st embodiment of the present invention, and shows a valve-open state. It is a time chart which shows the basic operation of the flush toilet according to the first embodiment of the present invention. 1 is an overall schematic configuration diagram of a flush toilet according to a first embodiment of the present invention, showing a valve opening state of a switching valve device. In the flush toilet according to the first embodiment of the present invention, the relationship between the flow rate Q [L / min] and the pressure [kPa] of each of the rim water discharge, the jet water discharge, and the rim jet water discharge with respect to the rotation speed of the pressurizing pump. FIG. FIG. 6 is an overall schematic configuration diagram of a flush toilet according to a second embodiment of the present invention. It is a longitudinal section of a change valve device of a flush toilet by a 2nd embodiment of the present invention, and shows a valve-closing state.

Next, a flush toilet according to a first embodiment of the present invention will be described with reference to the accompanying drawings.
Hereinafter, the term “flow rate” used in expressions such as “flow rate of cleaning water” and “flow rate of spouting water” in this specification refers to a volume change per unit time [L / min] ( (So-called “volume flow” or “instantaneous flow”).
FIG. 1 is an overall schematic configuration diagram of a flush toilet according to a first embodiment of the present invention.
As shown in FIG. 1, a flush toilet 1 according to a first embodiment of the present invention includes a toilet body 2 made of pottery and the like, and a functional unit 4 disposed behind the toilet body 2.
The toilet main body 2 includes a bowl portion 6, a rim water supply channel 8 including a rim water discharge port 8a, a jet water supply channel 10 including a jet water discharge port 10a, and a drain trap pipe line 12 (a drain trap portion).

The functional unit 4 includes a water supply pipe 14, a solenoid valve 16, a water storage tank 18, a pressurizing pump 20, a switching valve device 22, and the like from the upstream side to the downstream side.
The upstream side of the water supply pipe 14 is directly connected to the water supply. The solenoid valve 16 is provided in the water supply pipe 14 on the upstream side of the water storage tank 18 and is opened and closed under the control of the controller 24 (control unit). Thereby, the washing water in the water supply pipe 14 is supplied or stopped in the water storage tank 18.

Further, the pressure pump 20 is provided in a water supply passage 26 extending from the water storage tank 18 to the downstream side. The pressurizing pump 20 employs a so-called “axial flow pump” or the like that is suitable for a low head and a large flow rate, but the details of its structure are well-known in the art, and a description thereof will be omitted.
The rotation speed N [rpm] of the impeller (not shown) of the pressurizing pump 20 can be adjusted by the control of the controller 24.

  The switching valve device 22 is provided in the water supply passage 26 on the downstream side of the pressurizing pump 20, and receives the pressure of the washing water pressurized by the pressurizing pump 20, although its detailed structure will be described later. Open and close. Thus, the switching valve device 22 functions as a switching unit that switches a water supply path that supplies cleaning water to each of the rim water outlet 8a of the toilet body 2 and the jet water outlet 10a.

Next, the switching valve device 22 will be described in detail with reference to FIGS.
First, FIG. 2 is a longitudinal sectional view of the switching valve device of the flush toilet according to the first embodiment of the present invention, showing a closed state, and FIG. 3 is a view of the flush toilet according to the first embodiment of the present invention. It is a longitudinal section of a switching valve device, and shows a valve-open state.

As shown in FIGS. 1 to 3, the switching valve device 22 includes an upstream water supply passage 28 (first flow passage), a rim water supply passage 30 (second flow passage), and a jet water supply passage 32 (third flow passage). ) And a switching valve element 34.
First, as shown in FIGS. 1 to 3, the upstream water supply passage 28 (first flow passage) is connected to the water supply passage 26 extending from the pressurizing pump 20, and the downstream side thereof extends vertically to the switching valve body 34. It extends upward. That is, the switching valve body 34 is disposed at a position axially opposed to the upstream water supply passage 28 (first flow passage).
Next, as shown in FIGS. 1 to 3, the rim water supply passage 30 (second flow passage) extends from the branch portion B <b> 1 in the middle of the upstream water supply passage 28 located upstream of the switching valve body 34. It is branched and the downstream side is connected to the rim water supply passage 8 on the upstream side of the rim water outlet 8a of the toilet body 2.
In addition, as shown in FIGS. 1 to 3, in the jet water supply passage 32 (third flow passage), a downstream side from an upstream end (an upper end and a downstream end of the upstream water supply passage 28) opened and closed by the switching valve body 34. Basin extends laterally. Furthermore, the downstream side of the jet water supply path 32 (third flow path) is connected to the jet water supply path 10 on the upstream side of the jet water discharge port 10 a of the toilet body 2.

Incidentally, as shown in FIG. 1, a constant flow valve 35 is provided in the middle of either the rim water supply passage 30 of the switching valve device 22 or the rim water supply passage 8 of the toilet body 2.
Accordingly, it is possible to suppress external water leakage such as rim water discharged from the rim water outlet 8a into the bowl portion 6 passing through the rim water supply passage 8 of the toilet body 2 and splashing to the outside. I have.
In the present embodiment, the constant flow valve 35 is provided in the rim water supply passage 8, but the switching valve device 22 may be provided with a constant flow function.

As shown in FIGS. 1 to 3, the switching valve body 34 is provided only at the upstream end of the jet water supply passage 32 so as to be openable and closable, and is located at the branch portion B1 of the upstream water supply passage 28. 30 is located above the upstream end. As a result, the switching valve body 34 always opens the rim water supply passage 30 while opening and closing only the jet water supply passage 32 (third flow passage).
In particular, as shown in FIGS. 1 and 2, when the switching valve body 34 is closed, all of the washing water in the upstream water supply passage 28 flows from the branch portion B1 to the rim water supply passage 30 (second flow passage). The water is supplied to the rim water outlet 8a via the rim water supply passage 8 on the side of the toilet body 2 and the rim water supply passage 8a.
On the other hand, as shown in FIG. 3, when the switching valve body 34 is open, a part of the washing water in the upstream water supply passage 28 flows from the branch portion B1 to the rim water supply passage 30 (second passage). In addition, the water is supplied to the rim spout 8a through the rim water supply passage 8 on the toilet body 2 side, and most or more of the washing water in the upstream water supply passage 28 passes from the branch portion B1 to the jet water supply passage 32 ( The water is supplied to the jet water discharge port 10a through the third water flow path) and the jet water supply path 10 on the toilet body 2 side.

Further, as shown in FIGS. 2 and 3, the switching valve body 34 includes a diaphragm-shaped valve body portion 34a, a support portion 34b that supports the valve body portion 34a, and a valve body portion 34a and a support portion 34b. And a valve shaft portion 34c extending in a vertical axial direction (operating axial direction).
The valve body portion 34a is disposed at a position facing the upstream water supply passage 28 extending in the vertical direction in the direction of the central axis C1 (flow path axial direction).
As a result, the lower surface (pressure receiving surface S0) of the valve body portion 34a receives the pressure of the wash water in the upstream water supply passage 28 pressurized by the pressurizing pump 20, and the switching valve body 34 is opened from the closed state. To start.
Here, the lower surface (pressure receiving surface S0) of the valve body portion 34a receives the water pressure of the wash water in the upstream water supply passage 28 pressurized by the pressurizing pump 20, and the switching valve body 34 is opened from the closed state. Is assumed to be “boundary water pressure P0 [kPa]”, the lower surface (pressure receiving surface S0) of the valve body portion 34a is flushed with the cleaning water in the upstream water supply passage 28 pressurized by the pressure pump 20. When receiving a water pressure equal to or higher than the water pressure (boundary water pressure P0 [kPa]), the switching valve body 34 (34a, 34b, 34b) is in the same direction as the flow path axial direction of the upstream water supply passage 28 (of the valve shaft portion 34c). It can be mechanically operated in the axial direction (operating axial direction). Thus, the upstream end of the jet water supply passage 32 can be opened and closed by the valve body portion 34a according to the water pressure.
In the present embodiment, “the switching valve body 34 is mechanically operated” means that the switching valve body 34 is electrically operated (electrically opened and closed) by control by an electric signal or by electromagnetic force or the like. This means that the switching valve body 34 is mechanically actuated (mechanically opened / closed) when the switching valve body 34 is pressed by the direct action of water pressure or the like during opening and closing. Means that.

Next, as shown in FIG. 2, the upstream water supply passage 28 (first flow passage) is formed in a substantially cylindrical shape, and the center O1 of the valve body portion 34a of the switching valve body 34 is connected to the upstream water supply passage. 28 is located on the central axis C1 (first channel central axis).
Thereby, the water pressure (static pressure) P1 of the washing water in the upstream water supply path 28 in the closed state shown in FIG. 2 and the water pressure (dynamic pressure) of the washing water in the upstream water supply path 28 in the open state shown in FIG. ) P2 can be made to act almost uniformly on the pressure receiving surface S0 of the valve body portion 34a over the entire circumferential direction. Therefore, the operation at the time of switching the water supply path by the switching valve body 34 can be further stabilized.

Next, as shown in FIGS. 2 and 3, the switching valve device 22 further includes a compression coil spring 36 (biasing portion), an annular seal member 38 (buffer portion), and a support member 40 (support portion). Are provided.
The lower end of the compression coil spring 36 (biasing portion) is supported by the support portion 34b of the switching valve body 34, and the upper end is supported by the support member 40 (support portion).
Further, the compression coil spring 36 (biasing portion) acts on the switching valve body 34 (34a, 34b, 34b) in accordance with the compressed amount of bending to exert a biasing force for biasing in the direction of closing the valve. It has become.

For example, as shown in FIG. 2, a water pressure (static pressure) P1 lower than a predetermined water pressure (boundary water pressure P0 [kPa]) acts on the pressure receiving surface S0 of the valve body portion 34a of the switching valve body 34 in the closed state. In this case, the urging force F1 of the compression coil spring 36 exceeds the fluid force corresponding to the hydraulic pressure (static pressure) P1, so that the switching valve body 34 is kept closed.
Then, when a water pressure (static pressure) P1 higher than a predetermined water pressure (boundary water pressure P0 [kPa]) acts on the pressure receiving surface S0 of the valve body portion 34a of the switching valve body 34 in the closed state, as shown in FIG. Then, the valve body portion 34a of the switching valve body 34 is raised to switch to the valve open state.
Further, as shown in FIG. 3, a water pressure (dynamic pressure) P2 (≧ P0) equal to or higher than a predetermined water pressure (boundary water pressure P0 [kPa]) is applied to the pressure receiving surface S0 of the valve body portion 34a of the switching valve body 34 in the open state. When it is acting, since the fluid force corresponding to the hydraulic pressure (dynamic pressure) P2 exceeds the urging force F2 corresponding to the compression deflection of the compression coil spring 36, the switching valve body 34 opens against the urging force F2. The switching valve body 34 is maintained in the open state.

Next, as shown in FIGS. 2 and 3, the annular seal member 38 (buffer) is an O-ring having a circular cross section, or an annular seal member other than the circular cross section, such as X packing or Y packing.
The annular seal member 38 is held by the support member 40 in a state where the annular seal member 38 is attached to an upper portion of the outer peripheral surface of the valve shaft portion 34c of the switching valve body 34 by inserting the valve stem 34c of the switching valve body 34. . Thus, the valve shaft portion 34c of the switching valve body 34 is supported by the support member 40 via the annular seal member 38 so as to be slidable in the operation axis direction.
As shown in FIGS. 2 and 3, the annular seal member 38 (buffer) applies a buffering force f0 in a direction perpendicular to the operating axis direction of the switching valve body 34 to the valve shaft 34 c of the switching valve body 34. To act on.
Thereby, the annular seal member 38 is in contact with the outer peripheral surface of the valve shaft portion 34c of the switching valve body 34 to the extent that the internal space V1 of the support member 40 is opened to the atmosphere. Thus, when the valve shaft portion 34c of the switching valve body 34 slides in the operating axis direction, the annular seal member 38 applies a kinetic friction force or the like to the valve shaft portion 34c of the switching valve body 34 to slide. Dynamic resistance can be provided.

Incidentally, as shown in FIGS. 1 to 3, each of the switching valve element 34 (34 a, 34 b, 34 b), the compression coil spring 36, the annular seal member 38, and the support member 40 in the switching valve device 22 is the water storage tank 18. Is located above the overflow water level WO.
Accordingly, even if the washing water in the water storage tank 18 reaches the overflow water level, it is possible to reliably prevent the members 34, 36, 38, and 40 from being submerged, and to operate the switching valve device 22 poorly or deteriorate. Can be prevented.

Next, as shown in FIG. 2, a center axis C <b> 2 (the second axis C <b> 2) extending from the branch portion B <b> 1 of the upstream water supply passage 28 (the first flow passage) of the switching valve device 22 along the rim water supply passage 30 (the second flow passage). The two flow path central axes intersect at an angle θ with a central axis C1 (first flow path central axis) extending from the branch portion B1 toward the downstream side of the upstream water supply passage 28 (first flow path). I have.
Here, in the present embodiment, an example (θ = 90 °) in which the angle θ is set to 90 degrees (right angle) will be described. However, the angle θ is larger than 0 degree and smaller than 90 degrees (0 °). ° <θ <90 °) (an acute angle).
As a result, as shown in FIGS. 1 to 3, the washing water flowing from the upstream side into the branch portion B1 of the upstream water supply passage 28 (first flow passage) is converted into the upstream water supply passage 28 downstream of the branch portion B1. Into the rim water supply passage 30 (second flow passage) from the branch portion B1 to facilitate the flow.
In addition, a vortex flows in the upstream water supply passage 28 or the rim water supply passage 30 near or downstream of the branch portion B1 branching from the upstream water supply passage 28 (first flow passage) to the rim water supply passage 30 (second flow passage). This can be effectively suppressed.

Next, as shown in FIG. 3, the jet water supply path 32 (third flow path) of the switching valve device 22 includes a transition flow path part 32a and a main flow path part 32b from the upstream side to the downstream side. Have.
First, the transition flow path portion 32a of the jet water supply path 32 is a flow path formed to transition from the upstream end 32c (downstream end of the upstream water supply path 28) opened and closed by the switching valve body 34 to the main flow path portion 32b. It is.
In addition, the main flow path portion 32b of the jet water supply channel 32 is orthogonal to the center axis C1 extending laterally from the downstream end of the transition flow channel portion 32a, that is, the vertical direction of the upstream water supply channel 28 (first flow path). The flow path is formed so as to extend in the direction of the flow path.
Further, the upstream end 32c (the downstream end of the upstream water supply passage 28) of the transition flow passage 32a of the jet water supply passage 32 is located below the upper end 32d of the main flow passage 32b.
As a result, as shown in FIG. 3, when the switching valve body 34 is opened, the transition flow from the downstream end 32c of the upstream water supply passage 28 (first passage) to the jet water supply passage 32 (third passage). When the washing water flows into the passage 32a, a wide basin between the upstream end 32c of the transition passage 32a and the upper end 32d of the main passage 32b can be secured.
Therefore, when the switching valve body 34 is opened, it is possible to effectively suppress generation of a vortex when flowing from the upstream water supply passage 28 (first flow passage) to the jet water supply passage 32 (third flow passage). I can do it.

Here, as shown in FIGS. 2 and 3, the first flow path cross-sectional area A1 on the upstream side of the branch portion B1 in the upstream water supply path 28 (first flow path) of the switching valve device 22 is determined by the upstream water supply. The flow path 28 (first flow path) is different from the second flow path cross-sectional area A2 downstream of the branch portion B1.
Here, in the present embodiment, the second flow path cross-sectional area A2 is set to be larger than the first flow path cross-sectional area A1 (A2> A1).

As shown in FIGS. 2 and 3, the third flow path cross-sectional area A3 of the main flow path 32b of the jet water supply path 32 (third flow path) of the switching valve device 22 is the same as the upstream water supply path 28 (first flow path). The flow path is set to be larger than the second flow path cross-sectional area A2 on the downstream side of the branch portion B1 (A3> A2).
Further, as shown in FIGS. 2 and 3, the second flow path cross-sectional area A2 of the upstream water supply path 28 (first flow path) of the switching valve device 22 downstream of the branch portion B1 is equal to the rim water supply path 30. The second flow path is set to be larger than the fourth flow path cross-sectional area A4 (A2> A4).
As shown in FIGS. 2 and 3, the first flow path cross-sectional area A1 on the upstream side of the branch portion B1 in the upstream water supply path 28 (first flow path) of the switching valve device 22 is equal to the rim water supply path 30. The fourth flow path cross-sectional area A4 of the (second flow path) is set to be larger (A1> A4).

Next, as shown in FIG. 1, the water storage tank 18 of the flush toilet 1 of the present embodiment includes an upper float switch 42 and a lower float switch 44, which are water level detecting units for detecting the level of the flush water inside the flush toilet 18. Have.
Thereby, the upper float switch 42 is arranged at a predetermined full water level WL1 lower than the upper overflow water level WO in the water storage tank 18.
Accordingly, when the water level of the water storage tank 18 is the predetermined full water level WL1 lower than the upper overflow water level WO in the water storage tank 18, when the water level of the water storage tank 18 falls below the full water level WL1, the upper float switch 42 is turned on. The state is switched from the off state to the off state, and the controller 24 detects the signal transmitted from the upper float switch 42 and changes the solenoid valve 16 from the closed state to the open state.
Here, the predetermined full water level WL1 of the water storage tank 18 detected by the upper float switch 42 is an initial water level of the water storage tank 18 before the start of cleaning, and corresponds to a prescribed water storage amount before cleaning.

Further, as shown in FIG. 1, the lower float switch 44 is disposed below the upper float switch 42 in the water storage tank 18.
Accordingly, when the water level in the water storage tank 18 becomes lower than the position of the lower float switch 44 in the water storage tank 18, the lower float switch 44 is switched from the off state to the on state, and the water level in the water storage tank 18 becomes a predetermined low level. The fact that the water level WL2 has been reached can be detected.
Further, for the controller 24, for example, after the start of cleaning, the water level in the water storage tank 18 detected by the upper float switch 42 and the lower float switch 44, which are the water level detection units, has not dropped to a desired water level. The flow rate Q [L / min] of the washing water passing through the rim water supply channels 30 and 8 is larger than the predetermined flow rate Q0 [L / min] according to the information on the drop in the water level in the water storage tank 18 (Q> Q0). If it is determined that the rotation speed of the pressurizing pump 20 is reduced or the pressurizing pump 20 is stopped, the control can be performed.
Thus, it is possible to accurately detect whether the switching of the water supply paths 30 and 32 is operating normally by opening and closing the switching valve body 34.

Further, as shown in FIG. 1, the rim water supply passage 30 is provided with a flow rate sensor 46 which is a flow rate detection unit for detecting a flow rate of the washing water flowing inside the rim water supply path 30.
Accordingly, the controller 24 determines the flow rate Q [L / min] of the washing water passing through the rim water supply paths 30 and 8 according to the flow rate [L / min] in the rim water supply path 30 detected by the flow rate sensor 46. When it is determined that the flow rate is larger than the flow rate Q0 [L / min] (Q> Q0), it is possible to control to reduce the rotation speed of the pressurizing pump 20 or stop the pressurizing pump 20. .
Thus, it is possible to accurately detect whether the switching of the water supply paths 30 and 32 is operating normally by opening and closing the switching valve body 34.
In the flush toilet 1 of the present embodiment, the rim water supply passage 30 is provided in accordance with information detected by both the water level detection unit (upper float switch 42, lower float switch 44) and the flow rate detection unit (flow rate sensor 46). , 8 can be controlled to reduce the rotation speed of the pressurizing pump 20 or stop the pressurizing pump 20 when it is determined that the flow rate of the washing water passing through the pressurizing pump 20 is larger than a predetermined flow rate. .
However, the present invention is not limited to such an embodiment, and the controller 24 may determine whether or not the water level detector (the upper float switch 42, the lower float switch 44) or the flow detector (the flow sensor 46) has detected only one of them. A mode in which the number of rotations of the pressurizing pump 20 is controlled to decrease may be employed.

Next, the operation (action) of the flush toilet 1 according to the first embodiment of the present invention will be described with reference to FIGS.
FIG. 4 is a time chart showing the basic operation of the flush toilet according to the first embodiment of the present invention. FIG. 5 is an overall schematic configuration diagram of the flush toilet according to the first embodiment of the present invention, and shows a switching valve device in an open state.
Further, FIG. 6 shows the flow rate Q [L / min] and pressure of each of the rim spout, the jet spout, and the rim jet spout with respect to the rotation speed of the pressurizing pump in the flush toilet according to the first embodiment of the present invention. FIG. 4 is a characteristic diagram showing a relationship with [kPa].
In the characteristic diagram shown in FIG. 6, a plurality of curves showing the relationship between the flow rate Q [L / min] and the pressure [kPa] drawn for each rotation speed N of the pressurizing pump 20 are drawn in a contour line. I have. In FIG. 6, curves indicating the relationship between the flow rate Q [L / min] and the pressure [kPa] corresponding to the rim water discharge, the jet water discharge, and the rim / jet water discharge, respectively, are drawn in a parabolic shape. . Further, in FIG. 6, the trajectory of the relationship between the flow rate Q [L / min] and the pressure [kPa] that can be obtained when the switching valve element 34 is operated is indicated by a thick line and crosses.

First, as shown in FIG. 4, at time t1 after the standby state at time t0, when the toilet flush switch (not shown) is operated, each of the electromagnetic valve 16 and the pressure pump 20 is controlled by the controller 24. The power is turned on from the off state. Accordingly, the pressurizing pump 20 is operated, and the rotational speed N [rpm] of the pressurizing pump 20 increases to the rotational speed N1 [rpm] (for example, N1 = 3000 rpm). By the operation of the pressurizing pump 20, the washing water in the water storage tank 18 is supplied to the upstream water supply passage 28 (first flow passage) of the switching valve device 22 via the water supply passage 26, as shown in FIG. .
At this time, as shown in FIGS. 1 and 2, in the switching valve body 34 of the switching valve device 22, the urging force F1 acting on the switching valve body 34 by the compression coil spring 36 causes the upstream water supply of the switching valve device 22. The water pressure P1 (static pressure lower than the boundary water pressure P0, P1 <P0) in the passage 28 (first flow passage) exceeds the fluid force acting on the pressure receiving surface S0 of the valve body 34a. Thus, the valve body portion 34a is at the lowest position without being raised, and closes the upstream end 32c (the downstream end of the upstream water supply passage 26) of the transition flow passage portion 32a of the jet water supply passage 32 (see FIG. (Valve closed state).
Therefore, as shown in FIGS. 1 and 6, the washing water W1 (the water pressure P1 [kPa] and the flow rate shown in FIG. 6) supplied from the pressurizing pump 20 to the upstream water supply passage 28 of the switching valve device 22 at the rotation speed N1. Q1 [L / min]) is supplied from the branch portion B1 of the upstream water supply path 28 to only the rim water supply path 30 (second flow path), and is therefore supplied to the jet water supply path 32 (third flow path). Never.
Then, the washing water in the rim water supply passage 30 passes through the flow sensor 46 and the constant flow valve 35, and is discharged from the rim water discharge port 8 a of the rim water supply passage 8 of the toilet body 2 to the bowl portion 6. Thereby, during the time from time t1 to time t2 shown in FIG. 4 (for example, t2-t1 = 2.5 seconds), the first rim water discharge from the rim water discharge port 8a is executed, and as the first cleaning step, The first rim cleaning (so-called “pre-rim cleaning”) is performed.

Next, as shown in FIG. 4, at time t2, the rotation speed N [rpm] of the pressure pump 20 increases from the rotation speed N1 [rpm] to the rotation speed N2 [rpm] (for example, N2 = 5000 rpm) ( N2> N1). Then, during the period from time t2 to time t3 in FIG. 4 (for example, t3−t2 = 1.0 second), the rotation speed N [rpm] of the pressure pump 20 is maintained at a substantially constant rotation speed N2 [rpm]. You.
At this time, as shown in FIGS. 2, 3, and 5, in the switching valve body 34 of the switching valve device 22, the hydraulic pressure (static pressure) in the upstream water supply passage 28 (first flow passage) of the switching valve device 22. 3.) The fluid force of P1 acting on the pressure receiving surface S0 of the valve body portion 34a exceeds the urging force F1 of the compression coil spring 36 acting on the switching valve body 34. Accordingly, at time t2 in FIG. 4, the valve body portion 34a closes the upstream end 32c (the downstream end of the upstream water supply passage 26) of the transition flow passage 32a of the jet water supply passage 32 (see FIG. 2). ), And the valve is opened (see FIG. 3).
Further, as shown in FIG. 3, a hydraulic pressure (dynamic pressure) P2 acts on the pressure receiving surface S0 of the valve body portion 34a in the opened state, and a fluid force corresponding to the hydraulic pressure (dynamic pressure) P2 is applied. Is greater than the biasing force F2 of the compression coil spring 36, the switching valve body 34 is kept open (see FIG. 3).
Therefore, as shown in FIGS. 5 and 6, the cleaning water W1 (the water pressure P2 [kPa] and the flow rate shown in FIG. 6) supplied from the pressurizing pump 20 to the upstream water supply passage 28 of the switching valve device 22 at the rotation speed N2. Q2 [L / min]), a part of the cleaning water W2 (water pressure P2 [kPa] and flow rate Q3 [L / min] in FIG. 6) is used for rim water discharge, and the branch B1 of the upstream water supply passage 28 is used. Is supplied to the rim water supply passage 30 (second flow passage).
At the same time, as shown in FIGS. 5 and 6, the washing water W1 (the water pressure P2 [kPa] and the flow rate shown in FIG. 6) supplied from the pressurizing pump 20 to the upstream water supply passage 28 of the switching valve device 22 at the rotation speed N2. Q2 [L / min]), the remaining washing water W3 (water pressure P2 [kPa] and flow rate Q4 [L / min] in FIG. 6) is used for jet water discharge from the branch B1 of the upstream water supply passage 28. The water is supplied to the jet water supply path 32 (third flow path).
Then, as shown in FIG. 5, the wash water W2 (flow rate Q3 [L / min]) in the rim water supply passage 30 passes through the constant flow valve 35, and the rim water outlet 8a of the rim water supply passage 8 of the toilet main body 2. From the bowl 6. As a result, the second rim discharge is performed, and the second rim cleaning (so-called “medium rim cleaning”) is performed as the second cleaning step.
At the same time, as shown in FIG. 5, the cleaning water W3 in the jet water supply channel 32 has a flow rate Q4 [L / min] (which is larger than the cleaning water W2 (flow rate Q3 [L / min]) in the rim water supply channel 30). The water flows at Q4> Q3), and is discharged from the jet water discharge port 10a of the jet water supply passage 10 of the toilet body 2 to the bowl portion 6. Thereby, the first jet water discharge is executed, and the first jet cleaning is executed as the second cleaning step.

Next, as shown in FIG. 4, at time t3, the rotation speed N [rpm] of the pressure pump 20 is lower than the rotation speed N2 from the rotation speed N2 [rpm], and the rotation speed N1 in the first cleaning step. The rotation speed is lowered to a higher rotation speed N3 [rpm] (for example, N3 = 4000 rpm) (N1 <N3 <N2). Then, the rotation speed N [rpm] of the pressure pump 20 is maintained at a substantially constant rotation speed N3 [rpm] from time t3 to time t4 (for example, t4-t3 = 1.2 seconds) in FIG. You.
In addition, during the period from time t3 to time t4 in FIG. 4, the rotation speed N3 [rpm] of the pressure pump 20 is changed to the rotation speed N2 [rpm] of the pressure pump 20 during the period from time t2 to time t3 in FIG. The water pressure (dynamic pressure) P3 [kPa] and the flow rate Q5 [L / min] in the upstream water supply passage 28 (first flow passage) of the switching valve device 22 during the period from the time t3 to the time t4 by the amount reduced from ] (See FIG. 6) also falls below the hydraulic pressure (dynamic pressure) P2 and the flow rate Q2 [L / min] (see FIG. 6) during the period from time t2 to time t3 (P3 <P2, Q5 <). Q2).
However, even during the period from time t3 to time t4 in FIG. 4, the water pressure (dynamic pressure) P3 in the upstream water supply passage 28 (first flow passage) of the switching valve device 22 is applied to the pressure receiving surface S0 of the valve body portion 34a. Since the acting fluid force exceeds the urging force F2 acting on the switching valve body 34 by the compression coil spring 36, the valve opening state of the switching valve body 34 is maintained.
As a result, the second jet squirting is performed while the second rim squirting is maintained, and the second rim cleaning (so-called “medium rim cleaning”) is continued as the second cleaning step. The second jet cleaning is performed.
As a result, during the time from time t2 to time t4 shown in FIG. 4, the so-called “rim / jet water discharge” is executed by the rim water discharge from the rim water discharge port 8a and the jet water discharge from the jet water discharge port 10a. As the second cleaning step, both the middle rim cleaning and the jet cleaning are performed in parallel.

Next, as shown in FIG. 4, at time t4, the rotation speed N [rpm] of the pressurizing pump 20 changes from the rotation speed N3 [rpm] to a rotation speed N4 [rpm] lower than the rotation speed N1 of the first cleaning step. ] (For example, N4 = 2500 rpm) (N4 <N1 <N3). Then, the rotation speed N [rpm] of the pressure pump 20 is maintained at a substantially constant rotation speed N4 [rpm] from the time t4 to the time t5 in FIG. 4 (for example, t5-t4 = 5.0 seconds). Is done.
Further, during the time from time t4 to time t5 in FIG. 4, the rotation speed N4 [rpm] of the pressure pump 20 is changed to the rotation speed N1 [rpm] of the pressure pump 20 during the time from time t1 to time t2 in FIG. ], The water pressure (static pressure) P4 [kPa] and the flow rate Q6 [L / L] in the upstream water supply passage 28 (first flow passage) of the switching valve device 22 during the period from time t4 to time t5. min] (see FIG. 6) also falls below the water pressure (static pressure) P1 and the flow rate Q1 [L / min] (see FIG. 6) during the period from time t2 to time t3 (P4 <P1, Q6). <Q1).
At this time, as shown in FIGS. 1 and 2, in the switching valve body 34 of the switching valve device 22, the urging force F1 acting on the switching valve body 34 by the compression coil spring 36 causes the upstream water supply of the switching valve device 22. The hydraulic pressure (static pressure) P4 in the passage 28 (first passage) exceeds the fluid force acting on the pressure receiving surface S0 of the valve body 34a. As a result, the valve body portion 34a of the switching valve body 34 after the time t4 is lowered to the lowest position, and the upstream end 32c of the transition flow passage portion 32a of the jet water supply passage 32 (the downstream end of the upstream water supply passage 26). Is closed again (valve closed state).
Therefore, as shown in FIGS. 1 and 6, the washing water (water pressure P4 [kPa] and flow rate Q6 shown in FIG. 6) supplied from the pressurizing pump 20 into the upstream water supply passage 28 of the switching valve device 22 at the rotation speed N4. [L / min]) is supplied from the branch portion B1 of the upstream water supply passage 28 to only the rim water supply passage 30 (second flow passage), and is therefore supplied to the jet water supply passage 32 (third flow passage). There is no.
Then, during the time from time t4 to time t5 shown in FIG. 4 (for example, t5-t4 = 5.0 seconds), the washing water in the rim water supply channel 30 is discharged from the rim water outlet 8a for the third time. Is performed, and a third rim cleaning (so-called “post-rim cleaning”) is performed as a third cleaning step.

  Incidentally, as shown in FIGS. 1, 4 and 5, water is supplied from the water supply pipe 14 to the water storage tank 18 by opening and closing control of the electromagnetic valve 16 by the controller 24, and from time t1 to time t6 in FIG. At the time, the electromagnetic valve 16 is opened, and the water supply to the water storage tank 18 is performed.

  The times t0 to t6 shown in FIG. 4, the rotation speeds N1 to N4 of the pressurizing pump 20, and the like can be appropriately changed according to the specifications of the flush toilet 1, and are not limited.

According to the flush toilet 1 of the first embodiment of the present invention described above, the first cleaning step (“pre-rim cleaning” step shown in FIG. 4) is performed by switching the water supply paths 30 and 32 by the switching valve device 22. Then, the rim water is discharged from the rim water outlet 8a through the rim water supply path 30 with respect to the wash water in the water supply path 28.
Thereafter, in the second cleaning step (the “middle rim cleaning / jet cleaning” step shown in FIG. 4), jet water discharge is performed in which the water in the water supply passage 28 is also discharged from the jet water discharge port 10a while the rim water discharge is continued. Then, rim jet spouting can be performed.
Here, the rim water supply passages 30 and 8 for executing the rim water discharge in the first cleaning step (pre-rim cleaning step) and the second cleaning step (medium rim cleaning / jet cleaning step) are located upstream of the switching valve body 34. Is provided. Thus, regardless of the open / close state of the switching valve body 34, the state is always open from the water supply passage 28 to the rim water outlet 8a.
Therefore, for example, in the second cleaning step (medium rim cleaning / jet cleaning step), if the switching valve body 34 is unexpectedly closed due to failure or freezing of the switching valve device 22, for example, A relatively large flow of washing water to be spouted from the jet spout 10a via the jet spouts 32, 10 as jet spout flows into the rim water spouts 30, 8, which are always open, and from the rim spout 8a. It will be spouted.
Therefore, it is possible to prevent water leakage outside the machine due to an increase in the pressure in the water supply passage 28.
Further, since there is no need to separately provide a flow path or the like for bypassing the cleaning water in the water supply passage 28, the size of the entire apparatus can be reduced.
Furthermore, even in the case of an abnormality such as a failure or freezing of the switching valve device 22, the flow rate Q [L / min] of the washing water passing through the rim water supply channels 30, 8 is higher than the predetermined flow rate Q0 [L / min]. When it is determined that the pressure is large (Q> Q0), it is possible to control to reduce the rotation speed of the pressure pump 20 or to stop the pressure pump 20.
Therefore, it is possible to prevent a large flow of washing water from being supplied from the rim spout 8a to the bowl portion 6 of the toilet body 2 for a long time, and to suppress splashing of washing water from the bowl portion 6 to the outside. it can.
That is, when the controller 24 detects an abnormality while suppressing the pressure in the water supply passage 28 from increasing in an abnormal state, the supply amount of the washing water supplied from the pressurizing pump 20 to the water supply passage 28 is quickly increased. Therefore, the flushing of the washing water from the bowl portion 6 to the outside can be reliably suppressed.

Further, according to the flush toilet 1 of the present embodiment, the rim water supply passage 30 is provided with the flow rate detection unit (flow rate sensor 46) for detecting the flow rate of the wash water flowing in the inside.
As a result, the controller 24 passes through the rim water supply channels 30, 8 according to the information of the flow rate Q [L / min] of the rim water supply channels 30, 8 detected by these flow rate detection units (flow rate sensors 46). When it is determined that the flow rate Q [L / min] of the washing water is larger than the predetermined flow rate Q0 [L / min] (Q> Q0), the rotation speed of the pressurizing pump 20 is reduced or the pressure is increased. Control for stopping the pump 20 or the like can be performed.
Therefore, it is possible to accurately detect whether the switching of the water supply paths 30 and 32 is operating normally by opening and closing the switching valve body 34.
Further, when an abnormality such as a failure or freezing of the switching valve device 22 occurs, the rotation of the pressurizing pump 20 can be stopped under the control of the controller 24.
Therefore, in the event of an abnormality, it is possible to prevent the flush water in the water supply passage 28, which has been pressure-fed from the pressurizing pump 20, from flowing into the toilet main body 2 at a large flow rate for a long time, and it is possible to reliably prevent external leakage.

Further, according to the flush toilet 1 of the present embodiment, the water storage tank 18 is provided with the water level detecting unit (the upper float switch 42 and the lower float switch 44) for detecting the level of the flush water inside the water tank 18.
Accordingly, the controller 24 performs the cleaning that passes through the rim water supply passages 30 and 8 according to the information of the water level drop in the water storage tank 18 detected by the water level detection units (the upper float switch 42 and the lower float switch 44). When it is determined that the water flow rate Q [L / min] is larger than the predetermined flow rate Q0 [L / min] (Q> Q0), the switching of the water supply path is normally performed by opening and closing the switching valve body 34. Can be accurately detected.
Thus, when an abnormality such as a failure or freezing of the switching valve device 22 occurs, the rotation of the pressurizing pump 20 can be stopped under the control of the controller 24.
Therefore, in the event of an abnormality, it is possible to prevent the flush water from the water supply passage 28, which has been pressure-fed from the pressurizing pump 20, from flowing into the toilet main body 2 at a large flow rate for a long time, and it is possible to reliably prevent external leakage.

Next, a flush toilet according to a second embodiment of the present invention will be described with reference to FIGS. 7 and 8.
FIG. 7 is an overall schematic configuration diagram of a flush toilet according to a second embodiment of the present invention. FIG. 8 is a longitudinal sectional view of a switching valve device for a flush toilet according to a second embodiment of the present invention, showing a valve closed state.
Here, in the flush toilet 100 according to the second embodiment of the present invention shown in FIG. 7 and FIG. 8, the same parts as those of the flush toilet 1 according to the first embodiment of the present invention are denoted by the same reference numerals. Description is omitted.
As shown in FIGS. 7 and 8, in the flush toilet 100 according to the second embodiment of the present invention, whether the switching valve device 122 switches the water supply paths 30 and 32 by opening and closing the switching valve body 34. It is different from the flush toilet 1 according to the above-described first embodiment of the present invention in that an opening / closing detecting unit (opening / closing detecting device 146) for detecting whether or not the toilet is provided is provided.

As shown in FIG. 8, the opening / closing detection device 146 of the switching valve device 122 specifically includes a magnet 148, and further includes an element 150 such as a reed switch or a Hall element.
Further, as shown in FIG. 8, the magnet 148 is incorporated near the upper end of the valve stem 34c of the switching valve body 34, and the element 150, either a reed switch or a Hall element, is close to the magnet 148. It is provided inside the support member 40.
As a result, as shown in FIGS. 7 and 8, the controller 24 receives a signal transmitted from the reed switch or the Hall element 150 in accordance with the vertical movement of the valve stem 34c of the switching valve body 34 and the magnet 148. Is available.
Therefore, when the controller 24 determines that the flow rate of the washing water passing through the rim water supply passages 30 and 8 is larger than the predetermined flow rate in accordance with the information detected by the opening / closing detection device 146, the rotation of the pressure pump 20 It can be controlled to reduce the number.

According to the flush toilet 100 of the second embodiment of the present invention described above, the switching valve device 122 detects whether the switching of the water supply paths 30 and 32 is performed by opening and closing the switching valve body 34 by the opening and closing detection device 146. can do.
Therefore, it is possible to accurately detect whether the switching of the water supply paths 30 and 32 is normally operating by opening and closing the switching valve body 34.
Further, when an abnormality such as a failure or freezing of the switching valve device 22 occurs, the flow rate Q [L / min] of the washing water passing through the rim water supply channels 30 and 8 is larger than the predetermined flow rate Q0 [L / min] (Q> If it is determined that Q0), the rotation of the pressure pump 20 can be stopped.
Therefore, in the event of an abnormality, it is possible to prevent the flush water from the water supply passage 28, which has been pressure-fed from the pressurizing pump 20, from flowing into the toilet main body 2 at a large flow rate for a long time, and it is possible to reliably prevent external leakage.

In the flush toilet 100 according to the present embodiment, the rim water supply passage is provided in accordance with information detected by both the water level detection unit (upper float switch 42, lower float switch 44) and the open / close detection unit (open / close detection device 146). A description will be given of a mode in which control can be performed to reduce the rotation speed of the pressurizing pump 20 or stop the pressurizing pump 20 when it is determined that the flow rate of the washing water passing through 30, 30 is larger than the predetermined flow rate. I do.
However, the controller 24 is not limited to the flush toilet 100 of the present embodiment, and the controller 24 detects only one of the water level detection unit (the upper float switch 42 and the lower float switch 44) or the open / close detection unit (the open / close detection device 146). Based on the information thus obtained, a mode in which the number of rotations of the pressurizing pump 20 is controlled to decrease may be adopted.
Further, in the flush toilet 100 of the present embodiment, the flow detecting unit (the flow sensor 46) may be provided in the middle of the rim water supply passage 30, similarly to the flush toilet 1 according to the first embodiment of the present invention.
That is, as other embodiments of the flush toilets 1 and 100 of the first and second embodiments of the present invention, a water level detecting unit (upper float switch 42, lower float switch 44), a flow detecting unit (flow sensor 46), When the controller 24 determines that the flow rate of the washing water passing through the rim water supply passage 30 is larger than a predetermined flow rate based on the detection information of the three detection units of the open / close detection unit (open / close detection device 146), the controller 24 increases the pressure. Control may be performed such that the rotation speed of the pump 20 is reduced or the pressure pump 20 is stopped.

DESCRIPTION OF SYMBOLS 1 Rinse toilet according to 1st Embodiment of this invention 2 Toilet main body 4 Function part 6 Bowl part 8 Rim water supply channel 8a Rim water discharge port 10 Jet water supply path 10a Jet water discharge port 12 Drain trap pipe (drain trap part)
14 water supply pipe 16 solenoid valve 18 water storage tank 20 pressurizing pump 22 switching valve device (switching unit)
24 Controller (control unit)
26 water supply channel 28 upstream water supply channel (first channel)
30 Rim water supply channel (second channel)
32 Jet water supply channel (third channel)
32a Transition channel portion of jet water supply channel 32b Main channel portion of jet water channel 32c Upstream end of transition channel portion of jet water channel, downstream end of upstream water channel 32d Upper end of main channel portion of jet water channel 34 Switching valve Body 34a Diaphragm type valve body 34b Supporting part 34c Valve shaft 35 Constant flow valve 36 Compression coil spring (biasing part)
38 Annular seal member (buffer)
40 Supporting member (supporting part)
42 Upper float switch (water level detector)
44 Lower float switch (water level detector)
46 Flow sensor (flow detector)
100 Flush toilet bowl according to second embodiment of the present invention 122 Switching valve device (switching unit)
146 Open / close detection device 148 Magnet 150 Reed switch or Hall element A1 Channel cross-sectional area (first channel cross-sectional area of first channel)
A2 Channel cross-sectional area (second channel cross-sectional area of first channel)
A3 Channel cross-sectional area (third channel cross-sectional area of third channel)
A4 Channel cross-sectional area (fourth channel cross-sectional area of second channel)
B1 branch part C1 central axis of the upstream water supply channel of the switching valve device (first channel central axis)
C2 Central axis of the rim water supply channel of the switching valve device (second channel central axis)
f0 buffering force, frictional force F1 urging force F2 urging force N1 rotation speed of pressure pump N2 rotation speed of pressure pump N3 rotation speed of pressure pump N4 rotation speed of pressure pump O1 center of valve body of switching valve body P0 Boundary water pressure (predetermined water pressure)
P1 Water pressure (static pressure)
P2 water pressure (dynamic pressure)
P3 water pressure (dynamic pressure)
P4 water pressure (static pressure)
Q Flow rate [L / min]
Q0 flow rate [L / min] (predetermined flow rate)
Q1 flow rate [L / min] (first flow rate)
Q2 flow rate [L / min] (second flow rate)
Q3 Flow rate [L / min]
Q4 Flow rate [L / min]
Q5 Flow rate [L / min]
Q6 Flow rate [L / min] (third flow rate)
S0 Pressure receiving surface V1 Internal space W1 Wash water of upstream water supply passage (first flow passage) W2 Wash water of rim water supply passage (second flow passage) W3 Wash water of jet water supply passage (third flow passage) WL1 of water storage tank Full water level WL2 Low water level in water storage tank WO Overflow water level in water storage tank

Claims (4)

A flush toilet flushed by pressurized flush water,
A water storage tank for storing washing water;
A bowl body, a toilet body including a rim water outlet and a jet water outlet for discharging cleaning water, and a drain trap unit,
A water supply passage for enabling the washing water to be supplied from the water storage tank to each of the rim water outlet and the jet water outlet,
A switching unit that is provided in the water supply path and switches a water supply path that supplies cleaning water to each of the rim water discharge port and the jet water discharge port. First, the cleaning water in the water supply path is discharged from the rim water discharge port. Then, the water supply path is set so as to execute a second cleaning step of discharging the cleaning water in the water supply channel from the jet water discharge port while continuing the water discharge from the rim water discharge port. The switching unit for switching,
A pressurizing pump for pressurizing washing water supplied from the water storage tank to the water supply passage to adjust a flow rate of the washing water in the water supply passage, wherein a first flow rate of the cleaning water to be pumped during the first washing step is provided. The pressurizing pump, which is adjustable so that the second flow rate of the cleaning water to be pumped in the second cleaning step is larger than that of the second cleaning step,
A control unit for controlling the number of rotations of the pressurizing pump,
The switching unit includes a switching valve body that mechanically operates by receiving the pressure of the washing water pressurized by the pressure pump and that opens and closes a jet water supply path extending from the water supply path to the jet water discharge port. ,
A rim water supply passage extending to the rim water discharge port is provided in the water supply passage upstream of the switching valve body,
If the control unit determines that the flow rate of the washing water passing through the rim water supply passage is larger than a predetermined flow rate, the control unit controls the rotation speed of the pressurizing pump to decrease. Toilet bowl.   The switching unit further includes an open / close detection unit that detects whether the switching of the water supply path is performed by opening / closing the switching valve body. 2. The flush toilet according to claim 1, wherein when the flow rate of the washing water passing through the rim water supply passage is determined to be larger than a predetermined flow rate, the rotation speed of the pressurizing pump is reduced.   The rim water supply channel includes a flow rate detection unit that detects a flow rate of the wash water flowing inside the rim water supply channel, and the control unit controls the cleaning that passes through the rim water supply channel according to information detected by the flow rate detection unit. The flush toilet according to claim 1, wherein when it is determined that the flow rate of the water is larger than a predetermined flow rate, control is performed so as to reduce the rotation speed of the pressurizing pump.   The water storage tank includes a water level detection unit that detects a water level of the washing water inside the water storage tank, and the control unit reduces a rotation speed of the pressurizing pump according to information detected by the water level detection unit. The flush toilet according to claim 1, wherein the flush toilet is controlled as follows.

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