JP6857316B2 - Flush toilet - Google Patents

Description

The present invention relates to a flush toilet, and more particularly to a flush toilet that is washed with pressurized wash water.

Conventionally, as a flush toilet that is washed with pressurized washing water, for example, a flush toilet as described in Patent Documents 1 and 2 is known.
First, in the conventional flush toilet described in Patent Document 1, tap water is directly supplied to the rim spout to discharge the rim water, while the washing water stored in the tank is pumped. Jet water is discharged by pressurizing and discharging from the jet spout, that is, cleaning of the bowl portion by so-called "hybrid cleaning" is performed.
Further, in the conventional flush toilet described in Patent Document 1 described above, the water supply path for rim water discharge directly connected to the water supply and the jet water discharge water to be supplied to the tank in which the wash water for jet water discharge is stored. The water supply path for the toilet can be switched by an electrical switching valve (electromagnetic valve, etc.), and the switching operation of this electrical switching valve is performed by an electrical signal under the control of the controller. There is. As a result, when the toilet bowl cleaning is started, first, the rim spouting water is discharged from the rim spouting port, and then the washing water is spouted from the jet spouting port while the rim spouting water is continued. Jet water discharge is to be performed.
Further, in the conventional flush toilet described in Patent Document 2, the washing water stored in the tank is pressurized by a pump, and the rim water discharge and the jet water discharge are each supplied only by the washing water pressurized by this pump. It is supposed to run. Further, in this flush toilet, the water discharge path of the wash water pressurized by the pump is switched between the water supply path for rim water discharge and the water supply path for jet water discharge by an electric switching valve (solenoid valve, etc.). It is possible, and the switching operation of this electric switching valve is performed by an electric signal under the control of the controller.
Regarding the conventional flush toilets described in Patent Documents 1 and 2, even when installed in a low water pressure area or place, the flush water stored in the tank is pressurized by a pump to discharge water. Therefore, it is possible to ensure the cleaning performance of the toilet bowl.

Japanese Unexamined Patent Publication No. 2010-156201 JP-A-2017-66758

However, in the conventional flush toilet described in Patent Document 1 described above, water is supplied to each of the water supply path for rim water discharge by direct pressure of tap water and the water supply path for jet water discharge by pressurization of a pump. Since it is necessary to provide means, a device, and the like, the number of parts increases accordingly, and there is a problem that the entire device becomes large.
In particular, in the water supply path for rim water discharge that directly supplies tap water to the rim spout, it is preferable to arrange 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 arranged at a position higher than the rim spout in this way, a space in the height direction of the flush toilet is required, which is a factor that hinders the miniaturization of the device. ..

Further, in the conventional flush toilet described in Patent Document 2 described above, the height of the flush toilet has a structure in which the flush water pressurized by a common pump is supplied to the rim spout and the jet spout. The dimensions can be suppressed. 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 washing water in a state where a relatively large water pressure is applied by the pressurizing pump is jet water discharged from the water supply path for rim water discharge. It is necessary to switch to the water supply route for.
Therefore, in order to drive an electric switching valve (solenoid valve, etc.) in a state where a relatively large water pressure is applied to the water supply path in this way, a relatively large torque is required. There is a problem that it becomes large.
On the other hand, the torque required for the switching operation can be reduced by operating the switching valve in advance in a state where a relatively low water pressure is applied. However, if the rotation speed of the pump is increased when the switching valve is fully opened, there is a concern that waste water that does not contribute to the generation of siphons may be generated, especially in jet water discharge.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and receives the water pressure of the washing water in the water supply path for supplying the pressurized washing water to the rim spout and the jet spout. The purpose is to provide a flush toilet that can be mechanically and efficiently switched and the entire device can be miniaturized.

In order to solve the above-mentioned problems, the present invention is a water-washing stool that is washed with pressurized washing water, and has a water storage tank for storing washing water, a bowl portion, and a rim spout for discharging washing water. A toilet body provided with a jet spout, a drain trap portion, a water supply channel capable of supplying wash water from the water storage tank to each of the rim spout and the jet spout, and a water supply channel provided in the water supply channel. A switching unit that switches the water supply route for supplying wash water to each of the rim spout and the jet spout. First, a first cleaning step of discharging the wash water in the water supply channel from the rim spout. After that, the switching unit that switches the water supply route so as to execute the second cleaning step of discharging the wash water in the water supply channel from at least the jet spout, and the water storage tank supplies the water to the water supply channel. It is a pressurizing pump that pressurizes the washing water to be pressed and makes it possible to adjust the flow rate of the washing water in the water supply channel. It has the pressurizing pump, which can be adjusted so that the second flow rate of the washing water is larger, and the switching unit receives the water pressure of the washing water pressurized by the pressurizing pump and is a machine. The switching valve body is configured to switch the first cleaning step or the second cleaning step to a feasible water supply path according to the water pressure generated by the pressurizing pump. Then, the switching unit first executes the first cleaning step, discharges the cleaning water in the water supply channel from the rim spout, and then executes the second cleaning step to discharge the rim. while the water discharge of the washing water is continued from Mizuguchi, it is characterized in der Rukoto to switch the water supply channel to spouting flush water from the jet water spouting port.
In the present invention configured as described above, the switching valve body of the switching unit can be mechanically operated by receiving the water pressure of the washing water pressurized by the pressurizing pump. As a result, the water pressure generated by the operation of the pressurizing pump can be efficiently switched to the water supply path for executing the so-called "rim water discharge" by the first cleaning step of discharging water from the rim spout, or at least from the jet spout. It is possible to efficiently switch to a water supply path for executing so-called "rim jet water discharge" by the second cleaning step of discharging water.
For example, when switching from the first cleaning process (rim water discharge) to the second cleaning process (rim jet water discharge) by the switching unit, the water pressure in the water supply channel is adjusted to a relatively high water pressure by the operation of the pressurizing pump. The switching valve body that receives this relatively high water pressure can be mechanically operated in a responsive manner so as to open the water supply path for executing the rim jet water discharge.
Therefore, it is possible to suppress the generation of waste water that does not contribute to the occurrence of the siphon action in the bowl portion and the drain trap portion of the toilet bowl body at the time of jet spouting from the jet spout.
Further, at the end of the second cleaning process, the water pressure in the water supply channel is adjusted to a relatively low water pressure by the operation of the pressurizing pump, and the switching valve body that receives the relatively low water pressure executes the rim jet water discharge. Since it can be mechanically operated with good responsiveness so as to close the path, it is possible to suppress the generation of waste water even after the completion of the second cleaning step.
Further, since the switching valve body of the switching part is mechanically operated by receiving the water pressure of the washing water pressurized by the pressurizing pump, a motor or a solenoid valve for generating a relatively large torque in the switching part. There is no need for something that operates electrically. As a result, the device itself including the switching unit can be miniaturized, and the degree of freedom in installing the switching unit can be increased. With these, it is possible to realize the miniaturization of the entire flush toilet.
Further, by switching the water supply route by the switching unit, the first cleaning step is executed, the rim water discharge is executed to discharge the cleaning water in the water supply channel from the rim water discharge port, and then the rim water discharge is continued in the second cleaning step. While doing so, it is possible to execute jet water discharge that discharges the washing water in the water supply channel from the jet water discharge port, and to reliably execute rim jet water discharge.
Further, in the second cleaning step, even if a siphon action occurs in the bowl portion or the drain trap portion of the toilet bowl body due to jet water discharge, the rim water discharge is continued to suppress an increase in odor in the toilet bowl body. be able to.

In the present invention, preferably, the switching portion is provided on the upstream side of the switching valve body and is provided on the rim water supply channel for supplying washing water to the rim spout and on the downstream side of the switching valve body. It is provided with a jet water supply channel for supplying washing water to the jet spout.
In the present invention configured as described above, in the switching portion, the rim water supply channel for supplying the washing water to the rim spout is provided on the upstream side of the switching valve body, and the washing water is compared with the jet spout. Since the jet water supply channel for supplying at a high flow rate is provided on the downstream side of the switching valve body, the washing water on the upstream side of the switching valve body of the switching portion can be reliably supplied to the rim water supply channel.
Therefore, in the second cleaning step or the like, it is necessary to prevent the cleaning water that should be originally supplied to the rim water supply channel from being pulled by the jet water supply channel on the downstream side of the switching portion and the supply amount to the rim water supply channel is insufficient. Can be done.
As a result, it is possible to realize the miniaturization of the device including the switching portion while maintaining the cleaning performance of the flush toilet, and it is also possible to realize the miniaturization of the entire flush toilet.

In the present invention, preferably, the switching valve body of the switching portion opens and closes only the jet water supply channel.
In the present invention configured as described above, since the switching valve body of the switching portion opens and closes only the jet water supply channel, the rim water supply channel is used in each of the cleaning steps of the first cleaning step and the second cleaning step. Is not closed by the switching valve body of the switching portion and is always open, and at least rim water discharge can be performed.
In addition, by limiting the water supply path in which the switching valve body of the switching section is provided to only the jet water supply path, it is possible to realize the miniaturization of the device including the switching section, and also to realize the miniaturization of the entire flush toilet bowl. be able to.

In the present invention, preferably, the switching valve body of the switching portion is provided at the upstream end of the jet water supply channel so as to be openable and closable, and is located above the upstream end of the rim water supply channel.
In the present invention configured as described above, since the upstream end of the jet water supply channel opened and closed by the switching valve body of the switching portion is located above the upstream end of the rim water supply channel, the switching valve body is jet water supply. When the upstream end of the path is closed, the wash water on the upstream side of the switching part is discharged from the rim water supply channel below and upstream of the switching valve body without staying near the upstream end of the jet water supply channel. It can be drained efficiently.
Therefore, it is possible to prevent water stains and the like from adhering to the switching valve body for a long period of time because the switching valve body of the switching portion is constantly submerged, and it is possible to prevent malfunction and deterioration of the switching valve body.

In the present invention, preferably, the switching valve body of the switching portion is located above the overflow water level in the water storage tank.
In the present invention configured as described above, since the switching valve body of the switching portion is located above the overflow water level in the water storage tank, it is ensured that the switching valve body is submerged by the washing water in the water storage tank. It is possible to prevent malfunction and deterioration of the switching valve body.

In the present invention, preferably, the rim water supply channel is provided with a constant flow valve.
In the present invention configured as described above, especially during the second cleaning step, the cleaning water in the water supply channel is pumped at a relatively high flow rate by the pressurization of the pressurizing pump, so that the switching valve of the switching unit is used. Even in the rim water supply channel where the body is not provided, a relatively high flow rate of wash water will flow in.
Therefore, the flow rate of the washing water (rim water discharge) discharged from the rim spout through the rim water supply channel can be adjusted to a constant flow rate by the constant flow valve provided in the rim water supply channel. It is possible to suppress extra-machine leakage such as the washing water discharged to the outside splashing to the outside.

In the present invention, preferably, the switching portion further includes an urging portion that urges the switching valve body in the valve closing direction, and the switching valve body is in a state of receiving a water pressure equal to or higher than a predetermined value. It is configured to operate in the valve opening direction against the urging force of the urging portion.
In the present invention configured as described above, since the switching unit includes an urging unit that urges the switching valve body in the valve closing direction, the switching valve body is in a state of receiving a water pressure equal to or higher than a predetermined water pressure. , Can operate in the valve opening direction against the urging force of the urging portion.
As a result, the switching portion can be miniaturized with a simple structure, so that the entire flush toilet can be miniaturized.

In the present invention, preferably, the switching unit further discharges the washing water from the rim spout after the second washing step, and then discharges the washing water from the rim spout. The water supply path is switched so as to execute the above, and the pressurizing pump is a third flow rate of the cleaning water pumped during the third cleaning step rather than the second flow rate of the cleaning water pumped during the second cleaning step. Can be adjusted so that is smaller.
In the present invention configured as described above, the third flow rate of the cleaning water pumped during the third cleaning step is smaller than the second flow rate of the cleaning water pumped during the second cleaning step. When the third cleaning step is executed after the second cleaning step, the water pressure in the water supply channel is adjusted to a low pressure state, so that the water supply path during the second cleaning step is closed. , The water supply route at the time of the third cleaning step can be quickly switched.
Therefore, the third cleaning step can be performed with good responsiveness.

According to the flush toilet of the present invention, the water supply route for supplying the pressurized wash water to the rim spout and the jet spout can be mechanically and efficiently switched by receiving the water pressure of the wash water, and the entire device can be switched. It can be miniaturized.

It is an overall schematic block diagram of a flush toilet according to one Embodiment of this invention. It is a vertical cross-sectional view of the switching valve device of the flush toilet according to one Embodiment of this invention, and shows the valve closed state. It is a vertical cross-sectional view of the switching valve device of the flush toilet according to one Embodiment of this invention, and shows the valve open state. It is a time chart which shows the basic operation of the flush toilet according to one Embodiment of this invention. It is an overall schematic block diagram of the flush toilet according to one Embodiment of this invention, and shows the valve open state of a switching valve device. In the flush toilet according to the embodiment of the present invention, the relationship between the flow rates Q [L / min] and the pressure [kPa] of the rim water discharge, the jet water discharge, and the rim / jet water discharge with respect to the rotation speed of the pressure pump. It is a characteristic diagram which shows.

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

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. Further, the solenoid valve 16 is provided in the middle of 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). As a result, the washing water in the water supply pipe 14 is supplied or stopped in the water storage tank 18.

Further, the pressurizing pump 20 is provided in a water supply channel 26 extending downstream from the water storage tank 18. As the pressurizing pump 20, a so-called "axial flow pump" or the like, which has a low head and is suitable for a large flow rate, is adopted, but since the details of the structure are well-known techniques, the description thereof will be omitted.
Further, 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.

Further, the switching valve device 22 is provided in the water supply channel 26 on the downstream side of the pressurizing pump 20, and the detailed structure thereof will be described later, but the switching valve device 22 receives the water pressure of the washing water pressurized by the pressurizing pump 20. It is designed to open and close. As a result, the switching valve device 22 functions as a switching unit for switching the water supply path for supplying wash water to each of the rim water discharge port 8a and the jet water discharge port 10a of the toilet bowl main body 2.

Next, the details of the switching valve device 22 will be described with reference to FIGS. 1 to 3.
First, FIG. 2 is a vertical sectional view of a flush toilet switching valve device according to an embodiment of the present invention, showing a closed state, and FIG. 3 is a flush toilet switching valve according to an embodiment of the present invention. It is a vertical sectional view of an apparatus, and shows a valve open state.

As shown in FIGS. 1 to 3, the switching valve device 22 includes an upstream water supply channel 28 (first flow path), a rim water supply channel 30 (second flow path), and a jet water supply channel 32 (third flow path). ) And a switching valve body 34.
First, as shown in FIGS. 1 to 3, the upstream water supply channel 28 (first flow path) is connected to the water supply channel 26 extending from the pressurizing pump 20, and the downstream side thereof is in the vertical direction to the switching valve body 34. It extends upward. That is, the switching valve body 34 is arranged at an axially opposed position of the upstream water supply channel 28 (first flow path).
Next, as shown in FIGS. 1 to 3, the rim water supply channel 30 (second flow path) is from a branch portion B1 in the middle of the upstream water supply channel 28 located on the upstream side of the switching valve body 34. It is branched, and its downstream side is connected to the rim water supply channel 8 on the upstream side of the rim spout 8a of the toilet body 2.
Further, as shown in FIGS. 1 to 3, in the jet water supply channel 32 (third flow path), the downstream side from the upstream end (upper end and downstream end of the upstream water supply channel 28) opened and closed by the switching valve body 34. The basin of is extending to the side. Further, the downstream side of the jet water supply channel 32 (third flow path) is connected to the jet water supply channel 10 on the upstream side of the jet spout 10a of the toilet bowl main body 2.

Incidentally, as shown in FIG. 1, a constant flow rate 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 bowl main body 2.
As a result, it is possible to suppress extra-machine leakage such as rim spouting water spouting from the rim spouting port 8a into the bowl portion 6 passing through the rim water supply channel 8 of the toilet bowl body 2 and splashing to the outside. There is.
In the present embodiment, the constant flow rate valve 35 is provided in the rim water supply channel 8, but the switching valve device 22 may be provided with the constant flow rate function.

Further, as shown in FIGS. 1 to 3, the switching valve body 34 is provided so as to be openable and closable only at the upstream end of the jet water supply channel 32, and the rim water supply channel located at the branch portion B1 of the upstream water supply channel 28. It is located above the upstream end of 30. As a result, the switching valve body 34 opens and closes only the jet water supply channel 32 (third flow path) while the rim water supply channel 30 is always open.
In particular, as shown in FIGS. 1 and 2, when the switching valve body 34 is closed, all of the wash water in the upstream water supply channel 28 is transferred from the branch portion B1 to the rim water supply channel 30 (second flow). It is supplied to the rim spout 8a via the road) and the rim water supply channel 8 on the toilet body 2 side.
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 channel 28 is from the branch portion B1 to the rim water supply channel 30 (second flow path). In addition to being supplied to the rim spout 8a via the rim water supply channel 8 on the toilet body 2 side, most of the washing water in the upstream water supply channel 28 is supplied from the branch portion B1 to the jet water supply channel 32 ( It is supplied to the jet spout 10a via the third flow path) and the jet water supply channel 10 on the toilet body 2 side.

Further, as shown in FIGS. 2 and 3, the switching valve body 34 has 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. It is provided with a valve shaft portion 34c extending in the vertical axial direction (operating axial direction).
The valve body portion 34a is arranged at an opposite position on the central axis C1 direction (flow path axial direction) of the upstream water supply channel 28 extending in the vertical direction.
As a result, the lower surface (pressure receiving surface S0) of the valve body portion 34a receives the water pressure of the washing water in the upstream water supply channel 28 pressurized by the pressurizing pump 20, and the switching valve body 34 opens from the closed state. Is supposed to start.
Here, the lower surface (pressure receiving surface S0) of the valve body portion 34a receives the water pressure of the washing water in the upstream water supply channel 28 pressurized by the pressurizing pump 20, and the switching valve body 34 opens from the closed state. Assuming that the water pressure at the time of starting is "boundary water pressure P0 [kPa]", the lower surface (pressure receiving surface S0) of the valve body portion 34a is pressurized by the pressurizing pump 20. When the water pressure is higher than the water pressure (boundary water pressure P0 [kPa]), the switching valve bodies 34 (34a, 34b, 34b) are in the same direction as the flow path axial direction of the upstream water supply channel 28 (valve shaft portion 34c). It can be mechanically operated in the axial direction (operating axial direction). As a result, the upstream end of the jet water supply channel 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 operates mechanically" means that the switching valve body 34 is electrically operated (electrically opened and closed) by control by an electric signal, electromagnetic force, or the like. It means that it is different from the valve body, and it is a mechanical valve body that is pressed and mechanically operated (mechanically opened and closed) by the direct action of water pressure or the like when the switching valve body 34 is opened and closed. It means that.

Next, as shown in FIG. 2, the upstream water supply channel 28 (first flow path) is formed in a substantially cylindrical shape, and the center O1 of the valve body portion 34a of the switching valve body 34 is the upstream water supply channel. It is located on the central axis C1 (first flow path central axis) of 28.
As a result, the water pressure (static pressure) P1 of the washing water in the upstream water supply channel 28 in the valve closed state shown in FIG. 2 and the water pressure (dynamic pressure) of the washing water in the upstream water supply channel 28 in the valve opened state shown in FIG. ) P2 can act substantially evenly over the entire circumferential direction with respect to the pressure receiving surface S0 of the valve body portion 34a. 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 (a urging portion), an annular seal member 38 (buffer portion), and a support member 40 (support portion). Each has.
The lower end of the compression coil spring 36 (biased portion) is supported by the support portion 34b of the switching valve body 34, and the upper end thereof is supported by the support member 40 (support portion).
Further, the compression coil spring 36 (biased portion) acts on the switching valve body 34 (34a, 34b, 34b) with an urging force in the direction of closing the valve according to the amount of compression. It has become like.

For example, as shown in FIG. 2, a water pressure (static pressure) P1 less 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 valve body 34 in the closed valve state. In this case, the urging force F1 of the compression coil spring 36 exceeds the fluid force corresponding to the water pressure (static pressure) P1, so that the closed state of the switching valve body 34 is maintained.
Then, when a water pressure (static pressure) P1 equal to or 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 valve body 34 in the closed valve state, as shown in FIG. In addition, the valve body portion 34a of the switching valve body 34 rises 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 valve body 34 in the valve open state. When it is acting, the fluid force equivalent to the water pressure (dynamic pressure) P2 exceeds the urging force F2 according to the compression deflection of the compression coil spring 36, so that the switching valve body 34 opens the valve against the urging force F2. It operates in the direction, and the valve open state of the switching valve body 34 is maintained.

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 such as an X packing or a Y packing other than the circular cross section.
The annular seal member 38 is held by the support member 40 in a state of being attached to the upper part of the outer peripheral surface of the valve shaft portion 34c of the switching valve body 34 by inserting the valve shaft portion 34c of the switching valve body 34. .. As a result, the valve shaft portion 34c of the switching valve body 34 is in a state of being slidably supported in the operating shaft direction by the support member 40 via the annular seal member 38.
Further, as shown in FIGS. 2 and 3, the annular seal member 38 (buffer portion) applies a buffer force f0 in the direction perpendicular to the operating axis direction of the switching valve body 34 to the valve shaft portion 34c of the switching valve body 34. It is designed to act on.
As a result, 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. As a result, when the valve shaft portion 34c of the switching valve body 34 slides in the operating shaft direction, the annular seal member 38 exerts a dynamic friction force or the like on the valve shaft portion 34c of the switching valve body 34 to slide. It is possible to add dynamic resistance.

Incidentally, as shown in FIGS. 1 to 3, the water storage tank 18 is provided for each of the switching valve bodies 34 (34a, 34b, 34b), the compression coil spring 36, the annular seal member 38, and the support member 40 in the switching valve device 22. It is located above the overflow water level WO.
As a result, even if the washing water in the water storage tank 18 reaches the overflow water level, it is possible to surely prevent these members 34, 36, 38, 40 from being submerged, and the switching valve device 22 malfunctions or deteriorates. Can be prevented.

Next, as shown in FIG. 2, the central axis C2 (second flow path) extending from the branch portion B1 of the upstream side water supply channel 28 (first flow path) of the switching valve device 22 along the rim water supply path 30 (second flow path). The two flow paths central axis) intersects the central axis C1 (first flow path central axis) extending from the branch portion B1 toward the downstream side of the upstream water supply channel 28 (first flow path) at an angle θ. There is.
Here, in the present embodiment, an example (θ = 90 °) in which the angle θ is set to 90 degrees (right angle) will be described, but the angle θ is larger than 0 degrees and less than 90 degrees (0). It may be set so that the angle (acute angle) is ° <θ <90 °).
As a result, as shown in FIGS. 1 to 3, the washing water that has flowed from the upstream side into the branch portion B1 of the upstream side water supply channel 28 (first flow path) is transferred to the upstream side water supply channel 28 on the downstream side of the branch portion B1. It is possible to branch from the branch portion B1 to the rim water supply channel 30 (second flow path) to facilitate the flow.
Further, a vortex flows in the vicinity of the branch portion B1 branching from the upstream water supply channel 28 (first flow path) to the rim water supply channel 30 (second flow path) or in the upstream water supply channel 28 or the rim water supply channel 30 on the downstream side thereof. It is possible to effectively suppress the occurrence.

Next, as shown in FIG. 3, the jet water supply channel 32 (third flow path) of the switching valve device 22 has a transition flow path portion 32a and a main flow path portion 32b from the upstream side to the downstream side, respectively. I have.
First, the transition flow path portion 32a of the jet water supply channel 32 is a flow path formed so as to transition from the upstream end 32c (downstream end of the upstream side water supply channel 28) opened and closed from the switching valve body 34 to the main flow path portion 32b. Is.
Further, the main flow path portion 32b of the jet water supply channel 32 is orthogonal to the central axis C1 extending laterally from the downstream end of the transition flow path portion 32a, that is, in the vertical direction of the upstream side water supply channel 28 (first flow path). It is a flow path formed so as to extend in the direction of the plumb bob.
Further, the upstream end 32c (downstream end of the upstream water supply channel 28) of the transition flow path portion 32a of the jet water supply channel 32 is located below the upper end 32d of the main flow path portion 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 side water supply channel 28 (first flow path) to the jet water supply channel 32 (third flow path). When the washing water flows into the road portion 32a, a wide basin between the upstream end 32c of the transition flow path portion 32a and the upper end 32d of the main flow path portion 32b can be secured.
Therefore, when the switching valve body 34 is opened, it is possible to effectively suppress the generation of a vortex when flowing from the upstream water supply channel 28 (first flow path) to the jet water supply channel 32 (third flow path). You 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 side water supply channel 28 (first flow path) of the switching valve device 22 is the upstream side water supply. It is different from the second flow path cross-sectional area A2 on the downstream side of the branch portion B1 in the road 28 (first flow path).
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).

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

Next, the operation (action) of the flush toilet 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 6.
FIG. 4 is a time chart showing the basic operation of a flush toilet according to an embodiment of the present invention. Further, FIG. 5 is an overall schematic configuration diagram of a flush toilet according to an embodiment of the present invention, showing a valve open state of the switching valve device.
Further, FIG. 6 shows the flow rates Q [L / min] and pressure [L / min] 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 in the flush toilet according to the embodiment of the present invention. It is a characteristic diagram which shows the 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 contour lines. There is. Further, in FIG. 6, curves showing the relationship between the flow rate Q [L / min] and the pressure [kPa] corresponding to the rim discharge, the jet discharge, and the rim / jet discharge are drawn in a parabolic shape. .. Further, in FIG. 6, the locus of the relationship between the flow rate Q [L / min] and the pressure [kPa] that can be taken when the switching valve body 34 is operated is shown by a thick line and a cross mark.

First, as shown in FIG. 4, when the toilet bowl cleaning switch (not shown) is operated at time t1 after the standby state at time t0, the solenoid valve 16 and the pressurizing pump 20 are controlled by the controller 24, respectively. The power goes from off to on. As a result, the pressurizing pump 20 operates, and the rotation speed N [rpm] of the pressurizing pump 20 rises to the rotation speed N1 [rpm] (for example, N1 = 3000 rpm). By the operation of the pressurizing pump 20, as shown in FIG. 1, the washing water in the water storage tank 18 is supplied to the upstream water supply channel 28 (first flow path) of the switching valve device 22 via the water supply channel 26. ..
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 on which the compression coil spring 36 acts on the switching valve body 34 is the upstream side water supply of the switching valve device 22. The water pressure P1 (static pressure less than the boundary water pressure P0, P1 <P0) in the path 28 (first flow path) exceeds the fluid force acting on the pressure receiving surface S0 of the valve body portion 34a. As a result, the valve body portion 34a is in the lowest position without rising, and the upstream end 32c (downstream end of the upstream water supply channel 26) of the transition flow path portion 32a of the jet water supply channel 32 is closed (downstream end). The valve is closed).
Therefore, as shown in FIGS. 1 and 6, the washing water W1 (water pressure P1 [kPa] and flow rate in FIG. 6) supplied from the pressurizing pump 20 into the upstream water supply channel 28 of the switching valve device 22 at the rotation speed N1. Since Q1 [L / min]) is supplied only to the rim water supply channel 30 (second flow path) from the branch portion B1 of the upstream water supply channel 28, it is supplied to the jet water supply channel 32 (third flow path). There is no such thing.
Then, the washing water in the rim water supply channel 30 passes through the constant flow valve 35 and is discharged from the rim water discharge port 8a of the rim water supply channel 8 of the toilet bowl body 2 to the bowl portion 6. As a result, 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 the first cleaning step is performed. The first rim wash (so-called "front rim wash") is performed.

Next, as shown in FIG. 4, at time t2, the rotation speed N [rpm] of the pressurizing pump 20 rises from the rotation speed N1 [rpm] to the rotation speed N2 [rpm] (for example, N2 = 5000 rpm) (for example, N2 = 5000 rpm). N2> N1). Then, during the time from time t2 to time t3 in FIG. 4 (for example, t3-t2 = 1.0 second), the rotation speed N [rpm] of the pressurizing pump 20 is maintained at a substantially constant rotation speed N2 [rpm]. To.
At this time, as shown in FIGS. 2, 3 and 5, in the switching valve body 34 of the switching valve device 22, the water pressure (static pressure) in the upstream water supply channel 28 (first flow path) of the switching valve device 22. ) The fluid force that P1 acts on the pressure receiving surface S0 of the valve body portion 34a exceeds the urging force F1 that the compression coil spring 36 acts on the switching valve body 34. As a result, at time t2 in FIG. 4, the valve body portion 34a closes the upstream end 32c (downstream end of the upstream water supply channel 26) of the transition flow path portion 32a of the jet water supply channel 32 (see FIG. 2). ), And the valve is open (see Fig. 3).
Further, as shown in FIG. 3, a water 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 this water pressure (dynamic pressure) P2. Since the urging force F2 by the compression coil spring 36 is exceeded, the valve opening state of the switching valve body 34 is maintained (see FIG. 3).
Therefore, as shown in FIGS. 5 and 6, the washing water W1 (water pressure P2 [kPa] in FIG. 6 and the flow rate) supplied from the pressurizing pump 20 into the upstream water supply channel 28 of the switching valve device 22 at the rotation speed N2. A part of the washing water W2 (water pressure P2 [kPa] and flow rate Q3 [L / min] in FIG. 6) of Q2 [L / min]) is used for rim water discharge, and the branch portion B1 of the upstream water supply channel 28. Is supplied to the rim water supply channel 30 (second flow path).
At the same time, as shown in FIGS. 5 and 6, the washing water W1 (water pressure P2 [kPa] in FIG. 6 and the flow rate) supplied from the pressurizing pump 20 into the upstream water supply channel 28 of the switching valve device 22 at the rotation speed N2. The remaining wash water W3 (water pressure P2 [kPa] and flow rate Q4 [L / min] in FIG. 6) of Q2 [L / min]) is used for jet water discharge from the branch portion B1 of the upstream water supply channel 28. It is supplied to the jet water supply channel 32 (third flow path).
Then, as shown in FIG. 5, the washing water W2 (flow rate Q3 [L / min]) in the rim water supply channel 30 passes through the constant flow rate valve 35, and the rim water discharge port 8a of the rim water supply channel 8 of the toilet bowl body 2 passes. Water is discharged into the bowl portion 6. As a result, the second rim water discharge is executed, and the second rim cleaning (so-called “middle rim cleaning”) is executed as the second cleaning step.
At the same time, as shown in FIG. 5, the wash water W3 in the jet water supply channel 32 has a larger flow rate Q4 [L / min] (flow rate Q4 [L / min]) than the wash water W2 (flow rate Q3 [L / min]) in the rim water supply channel 30. It flows in Q4> Q3), and water is discharged from the jet spout 10a of the jet water supply channel 10 of the toilet bowl body 2 to the bowl portion 6. As a result, 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 pressurizing 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. It descends to a higher rotation speed N3 [rpm] (eg, N3 = 4000 rpm) (N1 <N3 <N2). Then, from the time t3 in FIG. 4 to the time t4 (for example, t4-t3 = 1.2 seconds), the rotation speed N [rpm] of the pressurizing pump 20 is maintained at a substantially constant rotation speed N3 [rpm]. To.
Further, during the time from time t3 to time t4 in FIG. 4, the rotation speed N3 [rpm] of the pressurizing pump 20 is the rotation speed N2 [rpm] of the pressurizing pump 20 during the period from time t2 to time t3 in FIG. Water pressure (dynamic pressure) P3 [kPa] and flow rate Q5 [L / min] in the upstream water supply channel 28 (first flow path) of the switching valve device 22 for the time from time t3 to time t4 by the amount of the decrease. ] (See FIG. 6), the water pressure (dynamic pressure) P2 and the flow rate Q2 [L / min] (see FIG. 6) during the time from time t2 to time t3 are lower (P3 <P2, Q5 < Q2).
However, even during the time from time t3 to time t4 in FIG. 4, the water pressure (dynamic pressure) P3 in the upstream water supply channel 28 (first flow path) of the switching valve device 22 is on 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 open state of the switching valve body 34 is maintained.
As a result, the second jet water discharge is executed while the execution of the second rim water discharge is maintained, and the second rim cleaning (so-called "middle rim cleaning") is continued as the second cleaning step. A second jet wash is performed.
As a result, in the time from time t2 to time t4 shown in FIG. 4, 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 is lower than the rotation speed N1 of the first cleaning step from the rotation speed N3 [rpm]. ] (For example, N4 = 2500 rpm) (N4 <N1 <N3). Then, from the time t4 to the time t5 in FIG. 4 (for example, t5-t4 = 5.0 seconds), the rotation speed N [rpm] of the pressurizing pump 20 is maintained at a substantially constant rotation speed N4 [rpm]. Will be done.
Further, in the time from time t4 to time t5 in FIG. 4, the rotation rate N4 [rpm] of the pressurizing pump 20 is the rotation rate N1 [rpm] of the pressurizing pump 20 in the time from time t1 to time t2 in FIG. ], The water pressure (static pressure) P4 [kPa] and the flow rate Q6 [L /] in the upstream water supply channel 28 (first flow path) of the switching valve device 22 for the time from time t4 to time t5. Min] (see FIG. 6) is also lower than the water pressure (static pressure) P1 and the flow rate Q1 [L / min] (see FIG. 6) during the time 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 on which the compression coil spring 36 acts on the switching valve body 34 is the upstream side water supply of the switching valve device 22. The water pressure (static pressure) P4 in the path 28 (first flow path) exceeds the fluid force acting on the pressure receiving surface S0 of the valve body portion 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 path portion 32a of the jet water supply channel 32 (downstream end of the upstream water supply channel 26). Is closed again (valve closed state).
Therefore, as shown in FIGS. 1 and 6, the washing water supplied from the pressurizing pump 20 into the upstream water supply channel 28 of the switching valve device 22 at the rotation speed N4 (water pressure P4 [kPa] and flow rate Q6 in FIG. 6). [L / min]) is supplied only to the rim water supply channel 30 (second flow path) from the branch portion B1 of the upstream water supply channel 28, and therefore is supplied to the jet water supply channel 32 (third flow path). There is no.
Then, the wash water in the rim water supply channel 30 is discharged from the rim spout 8a for the third time during the time from time t4 to time t5 (for example, t5-t4 = 5.0 seconds) shown in FIG. Is executed, and as a third cleaning step, a third rim cleaning (so-called “post-rim cleaning”) is executed.

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 controlling the opening and closing of the solenoid valve 16 by the controller 24, from time t1 to time t6 in FIG. At this time, the solenoid valve 16 is opened and water is supplied to the water storage tank 18.

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 embodiment of the present invention described above, the switching valve body 34 of the switching valve device 22 is mechanically operated by receiving the water pressure of the washing water pressurized by the pressurizing pump 20. Can be done. As a result, only the rim water discharge by the first cleaning step (“front rim cleaning” step shown in FIG. 4) of discharging water from the rim water discharge port 8a of the toilet bowl main body 2 is executed according to the water pressure generated by the operation of the pressurizing pump 20. The second cleaning step (“middle rim cleaning / jet” shown in FIG. 4) in which water is discharged from the jet spout 10a of the toilet bowl body 2 while efficiently switching to the water supply route (rim water supply passages 8 and 30) to be used and continuing rim water discharge. It is possible to efficiently switch to a water supply route (rim water supply passages 8 and 30 and jet water supply passages 10 and 32) for executing rim jet water discharge by the “washing” step).
For example, as shown in FIG. 4, when switching from the first cleaning step (front rim cleaning step) to the second cleaning step (middle rim cleaning / jet cleaning step) by the switching valve device 22, FIGS. 3, 4 and As shown in FIG. 6, by adjusting and increasing the rotation speed N [rpm] of the pressurizing pump 20 to N2, the water pressure P in the water supply channel 26 is adjusted to a water pressure P2 higher than the boundary water pressure P0.
As a result, the switching valve body 34 that has received the relatively high water pressure P2 can be mechanically operated with good responsiveness so as to open the upstream end of the jet water supply channel 32 that executes the rim jet water discharge.
Therefore, when jet water is discharged from the jet spout 10a of the toilet body 2, it is possible to suppress the generation of waste water that does not contribute to the occurrence of the siphon action in the bowl portion 6 of the toilet body 2 and the drain trap pipeline 12.
Further, as shown in FIG. 4, at the end of the second cleaning step (middle rim cleaning / jet cleaning step), the water pressure P4 in the water supply channel 26 is adjusted to a water pressure lower than the boundary water pressure P0 by the pressure pump 20. To.
As a result, the switching valve body 34 that has received the relatively low water pressure P4 can be mechanically operated with good responsiveness so as to close the jet water supply channel 32.
Therefore, it is possible to suppress the generation of waste water even after the completion of the second cleaning step (middle rim cleaning / jet cleaning step).
Further, since the switching valve body 34 of the switching valve device 22 is mechanically operated by receiving the water pressure of the washing water pressurized by the pressurizing pump 20, a relatively large torque is generated in the switching valve device 22. There is no need for electrically operated items such as motors and solenoid valves.
Therefore, the device itself including the switching valve device 22 can be miniaturized, and the degree of freedom in installing the switching valve device 22 can be increased. As a result, it is possible to realize the miniaturization of the flush toilet 1 as a whole.

Further, according to the water-washing toilet bowl 1 of the present embodiment, the first washing step (front rim washing step) is executed by switching the water supply path by the switching valve device 22, and the washing water in the water supply channels 26 and 28 is cleaned. After executing the rim water discharge from the rim water discharge port 8a, in the second cleaning step (middle rim cleaning / jet cleaning step), the cleaning water in the water supply channels 26 and 28 is discharged from the jet water discharge port 10a while continuing the rim water discharge. It is possible to execute jet water discharge from which water is discharged from, and to reliably execute rim jet water discharge.
Further, in the second cleaning step (middle rim cleaning / jet cleaning step), even if a siphon action occurs in the bowl portion 6 of the toilet bowl main body 2 and the drain trap pipeline 12 due to jet water discharge, the rim water discharge is continued. Therefore, it is possible to suppress an increase in odor in the toilet bowl main body 2.

Further, according to the flush toilet 1 of the present embodiment, in the switching valve device 22, the rim water supply passage 30 that supplies washing water from the water supply passages 26 and 28 to the rim water discharge port 8a is the switching valve body of the switching valve device 22. The jet water supply passage 32 is provided in the water supply passage 28 on the upstream side of the water supply passage 28 and supplies the washing water from the water supply passage 28 to the jet spout 10a at a relatively high flow rate from the switching valve body 34 of the switching valve device 22. Is also provided on the downstream side. As a result, the washing water can be reliably supplied to the rim water supply channel 30 at the branch portion B1 of the water supply channel 28 on the upstream side of the switching valve device 22.
Therefore, in the second cleaning step (middle rim cleaning / jet cleaning step) or the like, the cleaning water that should be originally supplied to the rim water supply channel 30 is the jet water supply channel 32 on the downstream side of the switching valve body 34 of the switching valve device 22. It is possible to prevent the supply amount to the rim water supply channel 30 from being insufficient due to being pulled by the rim water supply channel 30.
As a result, it is possible to realize the miniaturization of the device including the switching valve device 22 while maintaining the cleaning performance of the flush toilet 1, and it is also possible to realize the miniaturization of the entire flush toilet 1.

Further, according to the flush toilet 1 of the present embodiment, the switching valve body 34 of the switching valve device 22 can open and close only the jet water supply channel 32.
Therefore, in each cleaning step of the first cleaning step (front rim cleaning step) and the second cleaning step (middle rim cleaning / jet cleaning step), the rim water supply channel 30 is the switching valve body 34 of the switching valve device 22. It is always open without being closed by, and at least rim water discharge becomes feasible.
Further, by limiting the water supply path in which the switching valve body 34 of the switching valve device 22 is provided to only the jet water supply path 32, the device including the switching valve device 22 can be miniaturized, and the entire flush toilet bowl can be miniaturized. It is also possible to realize miniaturization.

Further, according to the flush toilet 1 of the present embodiment, the upstream end 32c of the jet water supply channel 32 opened and closed by the switching valve body 34 of the switching valve device 22 is located above the upstream end of the rim water supply channel 30. There is.
As a result, when the switching valve body 34 closes the upstream end 32c of the jet water supply channel 32, the washing water in the upstream water supply channel 28 of the switching valve device 22 is located near the upstream end 32c of the jet water supply channel 32. The water can be drained efficiently by discharging the water from the rim water supply channel 30 below and upstream of the switching valve body 34 without causing the water to stay.
Therefore, it is possible to prevent water stains and the like from adhering to the switching valve body 34 for a long period of time because the switching valve body 34 of the switching valve device 22 is constantly submerged, and it is possible to prevent malfunction and deterioration of the switching valve body 34. it can.

Further, according to the flush toilet 1 of the present embodiment, as shown in FIG. 1, since the switching valve body 34 of the switching valve device 22 is located above the overflow water level WO in the water storage tank, the water storage tank It is possible to reliably prevent the switching valve body 34 from being submerged by the washing water in 18, and it is possible to prevent malfunction or deterioration of the switching valve body 34.

Further, according to the water-washing toilet bowl 1 of the present embodiment, especially in the second washing step (middle rim washing / jet washing step), the washing water in the water supply channel 26 is compared by the pressurization of the pressurizing pump 20. Since the water is pumped at a high flow rate Q2 [L / min], the washing water having a relatively high flow rate Q3 [L / min] can be discharged even in the rim water supply channel 30 in which the switching valve body 34 of the switching valve device 22 is not provided. It will flow in.
Therefore, by providing the constant flow rate valve 35 in 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, water is discharged from the rim water discharge port 8a via the rim water supply passages 30 and 8. The constant flow rate valve 35 can adjust the flow rate Q [L / min] of the wash water (rim discharge water) to a constant flow rate.
Therefore, it is possible to suppress extra-machine leakage such as the washing water discharged into the bowl portion 6 of the toilet bowl body 2 being scattered to the outside.

Further, according to the flush toilet 1 of the present embodiment, the switching valve device 22 includes a compression coil spring 36 that urges the switching valve body 34 in the valve closing direction. As a result, as shown in FIGS. 3 and 5, the lower surface (pressure receiving surface S0) of the valve body portion 34a of the switching valve body 34 received a water pressure equal to or higher than the predetermined water pressure (boundary water pressure P0 [kPa] in FIG. 6). In the state, it can operate in the valve opening direction against the urging force of the compression coil spring 36.
As a result, the switching valve device 22 can be miniaturized with a simple structure, so that the entire flush toilet can be miniaturized.

Further, according to the water-washing toilet bowl 1 of the present embodiment, as shown in FIGS. 4 and 6, the switching valve device 22 is used to perform the rim spout 8a after the second cleaning step (middle rim cleaning / jet cleaning step). The water supply path can be switched to only the rim water supply channel 30 so as to execute the third cleaning step (post-rim cleaning step) in which the washing water is continuously discharged from the rim water discharge port 8a.
Further, the cleaning pump 20 pressurizes the cleaning water during the third cleaning step (rear rim cleaning step) rather than the flow rate Q2 [L / min] of the cleaning water pumped during the second cleaning step (middle rim cleaning / jet cleaning step). The water flow rate Q6 [L / min] can be adjusted to be smaller.
As a result, when the third cleaning step (rear rim cleaning step) is executed after the second cleaning step (middle rim cleaning / jet cleaning step), the water pressure P in the water supply channel 28 is in a low pressure state (water pressure P4 in FIG. 6). The water supply path (jet water supply channel 32) during the second cleaning step (middle rim cleaning / jet cleaning process) is closed, and the water supply path during the third cleaning step (rear rim cleaning process) is adjusted. It is possible to quickly switch to (rim water supply channel 30 only).
Therefore, the third cleaning step (post-rim cleaning step) can be performed with good responsiveness.

In the flush toilet 1 according to the embodiment of the present invention described above, as an example, both rim water discharge and jet water discharge are executed in the second cleaning step (middle rim cleaning / jet cleaning step) shown in FIG. Although the form has been described, the present invention is not limited to such a form, and in the second cleaning step, the rim water discharge may be omitted and only the jet water discharge may be performed.

1 Flush toilet 2 Toilet bowl body 4 Functional part 6 Bowl part 8 Rim water supply channel 8a Rim spout 10 Jet water supply channel 10a Jet spout 12 Drain trap pipe (drain trap part)
14 Water supply pipe 16 Solenoid valve 18 Water storage tank 20 Pressurized pump 22 Switching valve device (switching part)
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 Jet water supply channel transition flow path 32b Jet water supply main flow path 32c Jet water supply channel transition flow path upstream end, upstream water supply channel downstream end 32d Jet water supply main flow path upper end 34 Switching valve Body 34a Diaphragm type valve body 34b Support 34c Valve shaft 35 Constant flow valve 36 Compression coil spring (urgency)
38 Circular seal member (buffer)
40 Support member (support part)
A1 channel cross-sectional area (first channel cross-sectional area of the first channel)
A2 flow path cross-sectional area (second flow path cross-sectional area of the first flow path)
A3 flow path cross-sectional area (third flow path cross-sectional area of the third flow path)
A4 flow path cross-sectional area (4th flow path cross-sectional area of the 2nd flow path)
B1 Branch C1 Central axis of the upstream water supply channel of the switching valve device (1st flow path central axis)
Central axis of the rim water supply channel of the C2 switching valve device (center axis of the second flow path)
f0 Buffering force, frictional force F1 urging force F2 urging force N1 pressure pump rotation speed N2 pressure pump rotation speed N3 pressure pump rotation speed N4 pressure pump rotation speed 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)
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] (3rd flow rate)
S0 Pressure receiving surface V1 Internal space W1 Washing water for upstream water supply channel (first channel) W2 Cleaning water for rim water supply channel (second channel) W3 Cleaning water for jet water supply channel (third channel) WO Water storage tank Overflow water level

Claims (8)

A flush toilet that is washed with pressurized wash water.
A water storage tank that stores wash water and
A toilet body including a bowl portion, a rim spout and a jet spout for discharging wash water, and a drain trap portion.
A water supply channel that enables washing water to be supplied from the water storage tank to the rim spout and the jet spout, respectively.
It is a switching unit provided in this water supply channel to switch the water supply route for supplying wash water to each of the rim spout and the jet spout. First, the wash water in the water supply channel is spouted from the rim spout. The switching unit that switches the water supply path so as to execute the first cleaning step, and then to execute the second cleaning step of discharging the cleaning water in the water supply channel from at least the jet spout.
A pressurizing pump that pressurizes the washing water supplied from the water storage tank to the water supply channel and makes it possible to adjust the flow rate of the washing water in the water supply channel. It has the pressurizing pump, which can be adjusted so that the second flow rate of the washing water pumped during the second washing step is larger than that of the second washing step.
The switching unit includes a switching valve body that mechanically operates by receiving the water pressure of the washing water pressurized by the pressure pump, and the switching valve body responds to the water pressure generated by the pressure pump. The first cleaning step or the second cleaning step is configured to switch to a viable water supply path.
The switching unit first executes the first cleaning step to discharge the cleaning water in the water supply channel from the rim spout, and then executes the second cleaning step from the rim spout. while continuing the spouting of flush water, flush toilet, characterized in der Rukoto to switch the water supply channel to spouting flush water from the jet water spouting port. The switching portion is provided on the upstream side of the switching valve body to supply washing water to the rim spout, and is provided on the downstream side of the switching valve to clean the jet spout. flush toilet of claim 1 and a, and the jet water supply path for supplying water. The flush toilet according to claim 2 , wherein the switching valve body of the switching unit opens and closes only the jet water supply channel. The flush toilet according to claim 3 , wherein the switching valve body of the switching portion is provided at the upstream end of the jet water supply channel so as to be openable and closable, and is located above the upstream end of the rim water supply channel. The flush toilet according to claim 4 , wherein the switching valve body of the switching portion is located above the overflow water level in the water storage tank. The flush toilet according to any one of claims 3 to 5 , wherein a constant flow valve is provided in the rim water supply channel. The switching unit further includes an urging unit that urges the switching valve body in the valve closing direction. When the switching valve body receives a water pressure equal to or higher than a predetermined value, the urging force of the urging unit is provided. The flush toilet according to any one of claims 1 to 6 , which is configured to operate in the valve opening direction against the above. After the second cleaning step, the switching unit further executes a third cleaning step of continuously discharging the washing water from the rim spout and discharging the washing water from the rim spout. To switch between
The pressure pump can be adjusted so that the third flow rate of the cleaning water pumped during the third cleaning step is smaller than the second flow rate of the cleaning water pumped during the second cleaning step. flush toilet according to any one of 1 to 7.

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