JP2022026930A - Flushing water tank device and flush toilet bowl with flushing water tank device - Google Patents

Abstract

To provide a flushing water tank device which can improve flow of flushing water in the whole of a water storage tank body and which can enhance supply performance of flushing water to be supplied from the water storage tank body to a toilet bowl body while achieving downsizing of the water storage tank body as a whole, and a flush toilet bowl with the flushing water tank device.SOLUTION: A flushing water tank device 1 has a water storage tank body 22, a water supply valve device 28, an operation device 32, a jet pump unit 42, a small tank 62 for switching between feces flushing and urine flushing, and a feces flushing-urine flushing switching valve device 64. A switching opening 72 of the small tank 62 is arranged to be directed to a jet nozzle 46 of the jet pump unit. A flow-rectifying area R1 on the side of the water storage tank body for rectifying flushing water after being discharged from the switching opening is installed in an area inside the water storage tank body 22 between the switching opening and the jet nozzle.SELECTED DRAWING: Figure 7

Description

The present invention relates to a washing water tank device and a washing toilet equipped with the washing water tank device, and more particularly to a washing water tank device for supplying washing water to the toilet body by a jet pump action and a washing toilet equipped with the washing water tank device. ..

Conventionally, for example, as described in Patent Document 1-4, as a washing water tank device provided with a water storage tank body capable of storing washing water for washing the toilet body, a suction port of a throat pipe from a jet nozzle is used. The flow of the vigorous wash water sprayed toward is directly attracting the surrounding wash water such as near the suction port of the throat pipe without depending on other mechanical elements such as the pump. The so-called "jet pump action" that forms and uses this negative pressure to pump the washing water in the water storage tank body sucked into the throat pipe to the toilet body side, supplies the washing water to the toilet body. Are known.
These conventional wash water tank devices include a jet pump unit induced by the jet pump action described above. Specifically, this jet pump unit includes a throat pipe forming a drainage channel of a water storage tank body, a jet nozzle, and the like. A suction port is formed at the upstream end of the throat pipe to be ejected from a jet nozzle to suck the washing water, and the downstream end of the throat pipe is connected to the inlet of the headrace of the toilet bowl body. When the washing water is ejected from the jet nozzle toward the suction port of the throat pipe by such a jet pump action, the above-mentioned jet pump action is induced in the water storage tank body, and the above-mentioned jet pump action is induced from the water storage tank body side to the toilet body side. Washing water is supplied to the headrace.
Further, in the conventional washing water tank device, in order to make it possible to switch the amount of washing water supplied to the toilet bowl body into large and small, a small tank for switching between large and small washing is provided to divide (partition) the inside of the water storage tank body. ing.
Further, the small tank is provided with a switching opening formed so as to penetrate a partition wall that divides the internal area and the external area, and the large and small cleaning switching valves can be opened and closed in this switching opening. It is provided. As a result, during the large cleaning of the flush toilet, the large / small cleaning switching valve is opened, and the internal area and the external area of the small tank partitioned by the partition wall communicate with each other to store a large amount of cleaning water. It can be supplied from the tank body to the toilet body.
On the other hand, during the small cleaning of the flush toilet, the large / small cleaning switching valve is closed, and the cleaning water in the internal area of the small tank remains in the small tank without contributing to the small cleaning of the toilet, and is outside the small tank. Only the cleaning water in the area is supplied to the toilet bowl body to contribute to the small cleaning of the toilet bowl.

Japanese Unexamined Patent Publication No. 2015-206158 Japanese Unexamined Patent Publication No. 2015-206159 Japanese Unexamined Patent Publication No. 2015-151758 Japanese Unexamined Patent Publication No. 2002-327479

Further, in recent years, in order to suppress the above-mentioned dimensions of the entire flush toilet (more specifically, the distance in the front-rear direction from the rear wall surface of the toilet space where the flush toilet is installed to the front end of the flush toilet). In addition, how to reduce the size of the cleaning water tank device to ensure the cleaning performance of the toilet bowl has become a required issue.
However, in the internal space of the water storage tank body of the above-mentioned conventional washing water tank device that supplies washing water from the water storage tank body to the toilet body by the action of a jet pump, the washing water supplied from the water supply source is supplied to the water storage tank body. It is occupied by the water supply valve device that supplies water to the water supply and related parts of the jet pump unit.
For this reason, the smaller the size of the water storage tank body itself, the more the supply performance of the washing water supplied from the water storage tank body to the toilet bowl body may deteriorate, and it is possible to secure a sufficient amount of washing water to carry out the toilet bowl cleaning. There is a problem that it becomes difficult and there is a possibility that the toilet bowl cleaning performance may be deteriorated.
In addition, in the conventional washing water tank device that employs a small tank for switching between large and small washing that allows the amount of washing water supplied to the toilet body to be switched between large and small, the smaller the size of the water storage tank itself, the smaller the tank. The degree of design freedom is also reduced, for example, during large cleaning, the cleaning water that is discharged from the internal region of the small tank to the external region via the switching opening and supplied to the suction port of the throat pipe of the jet pump unit is smooth. There is also a problem that the flow is obstructed and a part of the washing water to be supplied to the toilet body side remains unnecessarily in the water storage tank body, and the washing ability at the time of the original large washing cannot be fully exhibited.

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art and the problems requested in recent years, improve the flow of the washing water in the entire water storage tank body, and change the water storage tank body to the toilet bowl body. It is an object of the present invention to provide a washing water tank device capable of improving the supply performance of the washing water supplied to the water storage tank and realizing the miniaturization of the entire water storage tank body, and a washing toilet bowl equipped with the washing water tank device. There is.

In order to solve the above-mentioned problems, the present invention is a washing water tank device that supplies washing water to the toilet body of a washing toilet by a jet pump action, and makes it possible to store the washing water for washing the toilet body. A water supply valve device including a water storage tank main body and a water supply valve that enables water supply and stoppage of the washing water supplied from the water supply source into the water storage tank main body, and a water supply valve of the water supply valve device when starting toilet cleaning. The operation unit that enables the valve opening operation and the switching operation that sets the amount of washing water supplied to the toilet bowl body to either large or small, and at least a part of it is submerged in the water storage tank body. It is a jet pump unit arranged in the above-mentioned state, and forms a drainage channel of the water storage tank body, the upstream end of which forms a suction port, and the downstream end of which is connected to the inlet of the headrace of the toilet body. The jet pump unit provided with a throat pipe forming an outlet and a jet nozzle for injecting wash water toward the suction port of the throat pipe to induce a jet pump action, and provided in the water storage tank main body. It is a small tank for switching between large and small washing that forms a small space where less washing water is stored than the washing water stored in the entire water storage tank body, and extends vertically inside the water storage tank body. A small tank for switching between large and small cleaning provided with a partition wall for partitioning an internal area and an external area of the small tank and a switching opening formed so as to penetrate the partition wall, and an operation of the operation unit. It has a large and small cleaning switching valve that can be opened and closed with respect to the switching opening of the small tank, and can switch the amount of cleaning water supplied to the toilet body through the jet pump unit between large and small. The switching opening is arranged so as to be directed toward the jet nozzle of the jet pump unit, and the area inside the water storage tank body between the switching opening and the jet nozzle is the small tank. The feature is that a rectifying region on the main body side of the water storage tank is provided to rectify the washing water after being discharged from the switching opening.
In the present invention configured as described above, for example, when the operation unit is operated when starting the large cleaning of the toilet body of the flush toilet, the water supply valve of the water supply valve device is opened and the large / small cleaning is switched. The valve is opened, and the switching opening of the small tank for switching between large and small cleaning is opened.
As a result, the washing water supplied from the water supply source passes through the water supply valve of the water supply valve device and is supplied to the jet nozzle of the jet pump unit. Then, the washing water is sprayed from the jet nozzle toward the suction port of the throat pipe, and the jet pump action is induced in the water storage tank body.
Furthermore, due to this jet pump action, the flow of the vigorous wash water jetted from the jet nozzle toward the suction port of the throat tube is not dependent on other mechanical elements such as the pump, and is directly applied to the throat tube. It forms a negative pressure that draws in the surrounding wash water, such as in the vicinity of the suction port. Then, the washing water in the water storage tank body sucked into the throat pipe by this negative pressure is pressure-fed to the toilet bowl body side. As a result, a large amount of washing water is supplied from the water storage tank main body to the toilet bowl main body, and the large washing toilet bowl washing is executed in the toilet bowl main body.
At this time, since the switching opening of the small tank opened and closed by the large / small cleaning switching valve is arranged so as to be directed toward the jet nozzle of the jet pump unit, the cleaning water in the small tank for switching the large / small cleaning is , The suction force of the mainstream of the washing water ejected from the jet nozzle to the suction port of the throat tube forms a flow that is drawn from the switching opening of the small tank toward the suction port of the throat tube and the jet nozzle. As a result, the washing water in the small tank can be smoothly discharged from the switching opening of the small tank toward the suction port of the throat pipe.
Further, the washing water after being discharged from the switching opening in the small tank is rectified by the rectifying region on the water storage tank body side between the switching opening of the small tank and the jet nozzle, while being rectified by the suction port of the throat pipe and the suction port of the throat pipe. It is drawn toward the jet nozzle and smoothly supplied near the suction port of the throat tube.
Therefore, a smooth flow of the washing water discharged from the switching opening of the small tank toward the suction port of the throat pipe and the jet nozzle is formed, so that the residual water in the small tank during the large washing can be reduced. can.
As a result, the wash water after being discharged from the switching opening of the small tank is the drainage channel of the water storage tank body together with the main wash water in the water storage tank body previously stored in the external area of the small tank. It is smoothly discharged from the throat tube to the toilet body side.
Further, in general, the flow of the washing water discharged from the switching opening of the small tank toward the suction port of the throat pipe is the main washing water in the water storage tank body previously stored in the outer region of the small tank. Collides with the mainstream towards the suction port of the throat tube, disrupting the flow of wash water. As a result, the efficiency with which the washing water in the water storage tank body is supplied into the throat pipe by the action of the jet pump is lowered, and the supply performance of the entire washing water supplied from the water storage tank body side to the toilet body side may be lowered. There is.
On the other hand, in the present invention, a rectifying region (rectifying region on the water storage tank body side) can be provided in the region inside the water storage tank body between the switching opening of the small tank for switching between large and small cleaning and the jet nozzle. ..
As a result, regarding the flow of the washing water discharged from the switching opening of the small tank toward the suction port of the throat pipe, the main washing water in the water storage tank body previously stored in the outer region of the small tank is the throat pipe. The main flow toward the vicinity of the suction port of the water can be rectified in advance in the rectifying region on the main body side of the water storage tank and merged in a stable state.
Therefore, the entire washing water in the water storage tank body can be stably supplied from the suction port of the throat pipe to the inside of the throat pipe by the action of a jet pump, and the discharge efficiency of discharging the washing water from the discharge port of the throat pipe to the toilet body side is also improved. Can be made to.
Furthermore, by providing a rectifying area on the water storage tank body side between the switching opening of the small tank and the jet nozzle, the suction port of the throat pipe, the switching opening of the small tank for the jet nozzle, and the large / small cleaning switching valve are also provided. As for the distance, the suction force from the suction port side of the throat tube due to the jet pump action can be secured to the extent that it does not interfere with the opening / closing operation of the large / small cleaning switching valve, so that the large / small cleaning switching valve can be operated stably. ..
From the above, it is possible to improve the flow of the washing water in the entire water storage tank body, improve the supply performance of the washing water supplied from the water storage tank body to the toilet bowl body, and realize the miniaturization of the entire water storage tank body. Can be done.

In the present invention, preferably, the large / small cleaning switching valve is provided with a valve body that can open and close the switching opening, and the lower end of the valve body is the bottom surface of the switching opening when the valve is opened. It can move from the vicinity to the upper position.
In the present invention configured as described above, if the valve body of the large / small wash switching valve is opened, the upper end thereof can move downward from the vicinity of the upper surface of the switching opening of the small tank. In that case, when the washing water in the small tank is discharged from the switching opening with the valve body open, a part of the valve body remains near the bottom surface of the switching opening of the small tank, etc. There is an increased risk that there will be something that interferes with the drainage of wash water. This causes the generation of residual water in the small tank, and there is a problem that the discharge efficiency of the switching opening of the small tank is lowered.
On the other hand, in the present invention, the valve body of the large / small wash switching valve has a lower end that can move from the vicinity of the bottom surface of the switching opening of the small tank toward the upper position when the valve is opened. When the washing water in the small tank is discharged from the switching opening in the state where the valve is opened, there is nothing near the bottom surface of the switching opening of the small tank that hinders the discharge of the washing water.
Therefore, the residual water in the small tank can be reduced.

In the present invention, preferably, the large / small cleaning switching valve further includes a hinge portion provided near the upper portion of the switching opening, and the valve body has a lower end portion thereof of the switching portion when the valve is opened. It is rotatably provided from the vicinity of the bottom surface of the opening toward the upward position around the hinge portion.
In the present invention configured as described above, the large / small cleaning switching valve is provided with a hinge portion provided near the upper part of the switching opening, and at the time of opening the valve, the lower end of the valve body is the switching opening of the small tank. Since it is provided so as to be rotatable from the vicinity of the bottom surface of the portion toward the upper position around the hinge portion, the valve body can be opened and closed more smoothly.

In the present invention, the small tank preferably includes a small tank main body provided so as to extend in the left-right longitudinal direction in the water storage tank main body, and a protruding portion protruding downward from the lower end of the small tank main body. , Equipped with,
The protrusions are provided on one side of the left and right longitudinal directions so as to face the first side wall surface on which the switching opening is formed, and on the other side of the left and right longitudinal directions so as to face the first side wall surface. It is equipped with a second side wall surface that has been removed.
In the internal region of the small tank formed between the first side wall surface and the second side wall surface of the protrusion, the washing water before being discharged from the switching opening in the small tank is rectified. There is a rectifying area in the small tank to make it
The maximum width dimension in the left-right direction of the rectified region in the small tank is set to be larger than the maximum width dimension in the front-rear direction.
In the present invention configured as described above, if the rectifying region in the small tank is not provided, the washing water in the small tank stays in the protruding portion, and the rectifying region on the water storage tank body side is provided from the switching opening. It will not be discharged smoothly into the tank, and the residual water in the small tank cannot be reduced. As a result, it is necessary to take measures such as setting a large opening cross-sectional area of the switching opening of the small tank, and it becomes difficult to reduce the size of the entire water storage tank body due to the increase in size of the small tank.
On the other hand, in the present invention, between the first side wall surface including the switching opening on one side in the left and right longitudinal directions and the second side wall surface on the other side in the protruding portion protruding downward from the lower end of the small tank main body. Since the rectifying region in the small tank is formed in the above, the washing water in the small tank can be rectified in the rectifying region in the small tank in advance before being discharged from the switching opening to the rectifying region on the main body side of the water storage tank. can.
As a result, even if the opening cross-sectional area of the switching opening of the small tank is not set large, the washing water in the small tank is switched while being rectified in advance in the rectifying region in the small tank without staying in the protruding portion. It is possible to smoothly and stably discharge water from the opening into the rectifying area on the water storage tank body side of the water storage tank body, and it is possible to reduce the residual water in the small tank.

In the present invention, preferably, the switching opening of the small tank is arranged above the suction port of the throat pipe.
In the present invention configured as described above, since the switching opening of the small tank is arranged above the suction port of the throat pipe, when the washing water in the small tank is discharged from the switching opening. Can leave the suction port submerged.
As a result, when residual water is present in the small tank, it is possible to prevent the suction force from being generated by the mainstream of the washing water jetted from the jet nozzle to the suction port of the throat pipe from being generated. Therefore, it is possible to prevent the washing water from being supplied from the water storage tank main body side to the toilet bowl main body side, and to prevent the toilet bowl washing from being completed in an insufficient state.
In addition, compared to the suction port of the throat pipe located above the switching opening of the small tank, the washing water in the small tank is affected by the interaction between the suction force due to the jet pump action and the gravity descent action. It is possible to efficiently discharge the water from the small tank into the main body of the water storage tank in the external region, and it is possible to reduce the residual water in the small tank.

In the present invention, preferably, the water storage tank main body has a longitudinal central axis that bisects its internal region into front and rear front regions and posterior regions, and the internal region is divided into left and right one side regions and the other side. Each area is equipped with a center axis in the lateral direction that bisects each area.
The switching opening is formed in the water storage tank main body in the lateral direction in which the suction port is not provided with respect to a region on one side of the left and right sides of the central axis in the lateral direction in which the suction port is provided. It is arranged in the region on the left and right sides of the central axis, and is arranged in the region on the front side of the longitudinal central axis.
In the present invention configured as described above, if the position of the switching opening of the small tank is too close to the position of the suction port of the throat pipe, the washing water stored in the small tank is stored. When is discharged from the switching opening, more washing water is sucked in earlier than the washing water in the water storage tank body in the external area of the small tank, and the water level in the small tank precedes the inside of the water storage tank body. May drop below the main water level.
As a result, the main water level in the water storage tank body in the external area of the small tank becomes higher than the water level in the small tank, so that the washing water in the water storage tank body in the external area of the small tank is in the small tank. There is a possibility that the washing water in the small tank will not be discharged as desired due to the backflow into the small tank from the switching opening, and residual water may be generated.
On the other hand, in the present invention, the switching opening of the small tank is located in the area on one side of the water storage tank body on the left and right sides of the center axis in the lateral direction of the water storage tank body provided with the suction port of the throat pipe. On the other hand, it is arranged in the area on the left and right sides of the center axis in the lateral direction of the water storage tank body having no suction port, and in the area in front of the center axis in the longitudinal direction of the water storage tank body. Therefore, it is possible to secure an appropriate relative distance between the switching opening of the small tank and the suction port while realizing the miniaturization of the entire water storage tank body.
Therefore, the suction force from the suction port side of the throat pipe due to the jet pump action can stably act on the switching opening of the small tank, so that the water level in the small tank is inside the water storage tank body in the external region. The washing water in the small tank can be supplied to the suction port from the switching opening in a state where the water level is almost the same as the main water level of.
In addition, by appropriately separating the switching opening of the small tank from the suction port, it is possible to prevent the suction force from the suction port side of the throat pipe due to the jet pump action from interfering with the opening / closing operation of the large / small cleaning switching valve. Therefore, the large / small cleaning switching valve can be operated stably.

In the present invention, preferably, the switching opening has a central axis that passes through the center of the opening cross section and extends in the left-right longitudinal direction of the water storage tank body, and the central axis of the switching opening is the throat pipe. It is arranged so as to be separated from the central axis in the longitudinal direction of the water storage tank body on one side in the front-rear direction.
In the present invention configured as described above, the central axis extending in the left-right longitudinal direction of the water storage tank body passing through the center of the opening cross section of the switching opening of the small tank stores water with respect to the longitudinal central axis of the throat pipe. Since it is arranged so as to be separated from one side in the front-rear direction of the tank body, the water storage tank body is compared with the case where the central axis of the switching opening is arranged on the same axis as the central axis in the longitudinal direction of the throat pipe. While realizing miniaturization of the whole, it is possible to secure an appropriate relative distance between the switching opening of the small tank and the suction port.
Therefore, the suction force from the suction port side of the throat tube due to the jet pump action can be stably applied to the switching opening of the small tank.

Next, the present invention is a flush toilet equipped with the wash water tank device.
In the present invention configured as described above, the flow of the washing water in the entire water storage tank body can be improved, the supply performance of the washing water supplied from the water storage tank body to the toilet body can be improved, and the water storage tank body can be improved. It is possible to provide a flush toilet equipped with a flush water tank device capable of achieving overall miniaturization.

According to the washing water tank device of the present invention and the washing urinal provided with the washing water tank device, the flow of the washing water in the entire water storage tank body is improved, and the supply performance of the washing water supplied from the water storage tank body to the toilet body is improved. It is possible to reduce the size of the entire water storage tank body.

It is a top view which shows the flush toilet equipped with the flush water tank device by one Embodiment of this invention. It is a side view of the washing water tank apparatus by one Embodiment of this invention, and is the sectional view along line II-II of the washing toilet bowl shown in FIG. It is a block diagram which shows the basic structure of the washing water tank apparatus by one Embodiment of this invention. The schematic front sectional view of the water storage tank main body and the small tank which shows the basic structure of the washing water tank apparatus by one Embodiment of this invention. It is a top view which shows the internal structure of the water storage tank main body of the washing water tank apparatus by one Embodiment of this invention. It is a partially enlarged front sectional view which expanded the part of the jet nozzle accommodating part in the water storage tank body of the washing water tank apparatus by one Embodiment of this invention, and the flow path switching valve is set in the flow path on the suction port side of a throat pipe. Indicates the state of being. It is a partially enlarged front sectional view of the part of the jet nozzle accommodating part in the water storage tank body of the washing water tank apparatus by one Embodiment of this invention, and the flow path switching valve is a water storage tank body side other than the suction port side of a throat pipe. Indicates the state set in the flow path of. FIG. 3 is an enlarged partial front sectional view of a water storage tank main body and a small tank portion of the washing water tank device according to the embodiment of the present invention. It is a perspective view which looked at the small tank of the washing water tank apparatus by one Embodiment of this invention from the front right diagonally above. It is sectional drawing along the IX-IX line of FIG. FIG. 8 is an enlarged partially enlarged perspective view of a portion of the large / small cleaning switching valve device of the cleaning water tank device according to the embodiment of the present invention shown in FIG. It is a partially enlarged view of the part of the large / small cleaning switching valve device in the washing water tank device according to one embodiment of the present invention, and is a large / small state in which the standby state before starting the toilet bowl cleaning operation and the state in which the large / small cleaning operation of the toilet bowl is started. The valve opening state of the switching valve body of the cleaning switching valve device is shown. It is a partially enlarged view of the part of the large / small washing switching valve device in the washing water tank device according to one embodiment of the present invention, and is a valve closing of the switching valve body of the large / small washing switching valve device in the state where the small washing operation of the toilet bowl is started. Indicates the state. It is a partially enlarged view of the part of the large / small cleaning switching valve device in the washing water tank device according to one embodiment of the present invention, and shows the valve closed state of the switching valve body of the large / small washing switching valve device during the small cleaning of the toilet bowl. It is a partially enlarged view of the part of the large and small washing switching valve device in the washing water tank device according to one embodiment of the present invention, and the small washing of the toilet bowl is completed, and the water supply from the water supply valve device to the inside of the water storage tank body is closed. The state where the switching valve body of the large / small cleaning switching valve device in the valve state is opened is shown. It is a flowchart which shows the flow of operation of the washing water tank apparatus by one Embodiment of this invention.

Hereinafter, a flush toilet equipped with a flush water tank device according to an embodiment of the present invention will be described with reference to the accompanying drawings.
First, with reference to FIGS. 1 and 2, the basic structure of a flush toilet equipped with a flush water tank device according to an embodiment of the present invention will be described.
FIG. 1 is a plan view showing a flush toilet bowl provided with a wash water tank device according to an embodiment of the present invention, and FIG. 2 is a side view of the wash water tank device according to an embodiment of the present invention. It is sectional drawing along the II-II line of the flush toilet shown in 1.

First, as shown in FIGS. 1 and 2, the flush toilet 2 provided with the wash water tank device 1 according to the embodiment of the present invention includes the toilet body 4. The washing water tank device 1 of the present embodiment, which will be described in detail later, is arranged on the upper surface of the toilet bowl body 4 on the rear side.
Next, as shown in FIGS. 1 and 2, the toilet bowl main body 4 has a bowl portion 6 provided on the front side thereof, a rim portion 8 formed on the upper edge of the bowl portion 6, and the rim portion 8. It is provided with a shelf portion 10 formed on the inner circumference.
Further, an inlet 12a of the trap drainage channel 12 is opened at the bottom of the bowl portion 6 of the toilet bowl body 4, and the trap drainage channel 12 includes an ascending pipe 12b extending upward and a descending pipe 12c extending downward. .. As can be seen from the shape of the trap drainage channel 12, the flush toilet bowl 2 according to the present embodiment is a wash-off type toilet bowl that discharges filth by a drop in the height direction.
In this embodiment, a form applied to the wash-off type toilet bowl will be described, but the present invention is not limited to such a form, and the filth in the bowl portion is sucked in by using the siphon action to the outside at once from the drain trap pipeline. It is also applicable to other forms of flush toilets, such as the form of a so-called siphon type toilet that discharges.

Next, the toilet body 4 has a headrace 16 into which the wash water discharged from the drain port 14 of the wash water tank device 1 flows in, and a first rim spout port formed in the center on the left side when viewed from the front of the shelf portion 10. It is provided with 18 and a second rim spout 20 formed on the right rear side when viewed from the front.
Further, the headrace 16 branches downstream into the first headrace 16a and the second headrace 16b, and the washing water of the headrace 16 reaches the first rim spout 18 via the first headrace 16a. , The second rim spout 20 is reached through the second headrace 16b, and the washing water is spouted from the first rim spout 18 and the second rim spout 20, respectively, to wash the bowl portion 6 and clean the filth. It is designed to be discharged from the trap drainage channel 12.

Next, the details of the washing water tank device 1 of the present embodiment will be described with reference to FIGS. 1 to 11D.
First, FIG. 3 is a block diagram showing a basic configuration of a washing water tank device according to an embodiment of the present invention. Further, FIG. 4 is a schematic front sectional view of a water storage tank main body and a small tank showing a basic configuration of a washing water tank device according to an embodiment of the present invention. Further, FIG. 5 is a plan view showing the internal structure of the water storage tank main body of the washing water tank device according to the embodiment of the present invention.
In the washing water tank device 1 shown in FIG. 3, for convenience, the entire internal structure of the water storage tank body 22 is schematically simplified, so that the structure of the washing water tank device 1 shown in FIGS. 4 and 5 is shown. It is different from the arrangement of.
Further, in the washing water tank device 1 shown in FIG. 4, a part of the structure is simplified.
Further, regarding the left-right direction of the washing water tank device 1 shown in FIGS. 1 to 11D, the left side in the left-right direction when viewed from the front side (user side) of the toilet bowl main body 4 of the flush toilet bowl 2 is the "left side", and the toilet bowl main body. The right side in the left-right direction when viewed from the front side of 4 is defined as the "right side".

First, as shown in FIGS. 3 to 5, the washing water tank device 1 includes a ceramic exterior tank T, a water storage tank main body 22 which is an interior tank housed in the exterior tank T, and water supply and the like. It includes a water supply pipe 24 connected to a water source (not shown).
In the water storage tank main body 22, a part of the washing water supplied through the water supply pipe 24 is stored and can be supplied to the headrace 16 of the toilet bowl main body 4.
Further, as shown in FIG. 4, the water storage tank main body 22 is arranged at a relatively low position on the rear side of the toilet bowl main body 4, and the upper end height position of the water storage tank main body 22 is low, that is, a so-called low silhouette type tank. As shown in FIG. 5, it is formed in a flat shape that is long in the left-right direction in a plan view.

Next, as shown in FIGS. 3 to 5, a water supply valve device 28 for supplying and stopping the washing water supplied from the water supply pipe 24 via the constant flow rate valve 26 is provided inside the water storage tank main body 22. ing.
The water supply valve device 28 includes a main valve 30 and the like, which are water supply valves that open and close the water supply passage on the downstream side of the constant flow rate valve 26.
Further, the washing water tank device 1 includes an operating device 32 (operating lever 32a, drive rotating shaft 32b) which is an operating unit for operating the operation of the water supply valve device 28 when starting the washing of the toilet bowl.

Next, the details of the internal structure and the operating mechanism of the water supply valve device 28 will be described with reference to FIGS. 3 to 5.
First, the water supply valve device 28 further includes a poppet valve 34, a float 36, and a float-side pilot valve 38.
The poppet valve 34 is an operation-side pilot valve that opens and closes the main valve 30 by rotating the operating lever 32a and the drive rotation shaft 32b of the operating device 32. Further, the float 36 moves up and down by buoyancy according to the water level in the water storage tank main body 22. Further, the float side pilot valve 38 opens and closes the main valve 30 by moving the float 36 up and down.

Next, as the main structure of the main valve 30 part of the water supply valve device 28, the main valve body 30a which is a pilot type diaphragm valve, the main valve seat 30b on which the main valve body 30a is seated, and the main valve seat 30b on which the main valve body 30a is seated are mainly operated by internal pressure. It is provided with a pressure chamber 30c for moving the valve body 30a with respect to the main valve seat 30b.
As a result, the water supply valve device 28 is either in a water stop state in which the main valve body 30a is seated on the main valve seat 30b to stop water, or in a water supply state in which the main valve body 30a is separated from the main valve seat 30b to supply water. It is possible to switch to that state.
Further, the pressure chamber 30c is provided with a poppet hole 34a and a float side pilot hole 38a for releasing the pressure of the pressure chamber 30c, respectively.
Further, a poppet valve 34 is provided in the poppet hole 34a of the pressure chamber 30c so as to be openable and closable. The poppet valve 34 is connected to a drive rotation shaft 32b that connects the operation lever 32a and the water supply valve device 28. The drive rotary shaft 32b can rotate around the shaft in conjunction with the manual operation of the operation lever 32a by the user, and is a part of the operation unit for operating the operation of the water supply valve device 28. ..
Further, a float-side pilot valve 38 is provided in the float-side pilot hole 38a of the pressure chamber 30c. The float-side pilot valve 38 can be opened and closed by moving the float 36 up and down according to the water level of the washing water in the water storage tank main body 22.
It is also possible to provide an electromagnetic valve instead of the poppet valve 34 and change the operating device 32 to a switch or the like.

Further, the main valve body 30a is provided with a bleed hole (not shown), and when the water is stopped, the primary side flow path A of the water supply pipe 24 and the pressure chamber 30c are provided with the bleed hole (not shown). It communicates with the inside.
Here, the opening area of the poppet hole 34a is formed to be larger than the opening area of the float side pilot hole 38a. Further, the poppet hole 34a is formed at a position above the float side pilot hole 38a as shown in FIG.

Further, as shown in FIG. 4, the water supply valve device 28 is normally in a water stop state, and in the water stop state, both the poppet hole 34a and the float side pilot hole 38a are closed, and the water supply pipe 24 is closed. The primary side flow path A communicates with the pressure chamber 30c through a bleed hole (not shown).
Therefore, the water pressure of the primary side flow path A of the water supply pipe 24 and the water pressure of the pressure chamber 30c are the same water pressure (primary side flow path pressure α), and the secondary side flow path B of the water supply pipe 24 is open to the atmosphere, and the main valve. Since the area where the water pressure acts on the body 30a is larger than the area of the primary side flow path A, the main valve body 30a is pressed against the main valve seat 30b and is in a closed state.

Next, in the water supply valve device 28, when the poppet hole 34a is opened by the poppet valve 34 and / or the float side pilot hole 38a is opened by the float side pilot valve 38, the washing water is discharged from the pressure chamber 30c. It flows out and the pressure in the pressure chamber 30c is reduced.
As a result, the main valve body 30a moves away from the main valve seat 30b to open the valve, and the water is discharged.

Further, in the water supply valve device 28, when the poppet hole 34a is closed by the poppet valve 34 and the float side pilot hole 38a is closed by the float side pilot valve 38, the pressure in the pressure chamber 30c is again reduced to the primary side flow path pressure. It becomes α, and the main valve body 30a moves toward the main valve seat 30b, and finally becomes a closed valve state (water stop state).
At this time, since the washing water of the primary side flow path A is gradually injected into the pressure chamber 30c from the bleed hole, the main valve is delayed by a predetermined time after the poppet hole 34a and the float side pilot hole 38a are closed. The body 30a is in a valve closed state (water stop state).
A jet pump unit 42 (details will be described later) connected via the vacuum break valve 40 is provided in the water supply passage on the downstream side of the water supply valve device 28.

Next, the details of the jet pump unit 42 will be described with reference to FIGS. 3 to 6B.
First, as shown in FIGS. 3 to 5, the jet pump unit 42 is provided on the downstream side of the water supply pipe 44 extending from the vacuum break valve 40, and the jet nozzle 46 and the flow flow from the upstream side to the downstream side. It is provided with a path switching valve 48 and a throat pipe 50, respectively.
Further, each of these jet nozzles 46, the flow path switching valve 48, and the suction port 50a of the throat pipe 50 is located on one of the left and right sides of the water storage tank body 22 (in FIG. 3, the right side when the water storage tank body 22 is viewed from the front side). ), It is arranged in the jet nozzle accommodating portion H protruding downward.

6A and 6B show a partially enlarged front sectional view of an enlarged portion of the jet nozzle accommodating portion in the water storage tank main body of the washing water tank device according to the embodiment of the present invention.
Note that FIG. 6A shows a state in which the flow path switching valve 48 of the jet pump unit 42 is set in the flow path on the suction port 50a side of the throat pipe 50.
On the other hand, FIG. 6B shows a state in which the flow path switching valve 48 of the jet pump unit 42 is set in the flow path on the water storage tank main body 22 side other than the suction port 50a side of the throat pipe 50.
As shown in FIGS. 4 to 6B, the jet nozzle 46 of the jet pump unit 42 is arranged in a state where at least a part of the jet nozzle 46 is submerged inside the water storage tank main body 22 from the water supply pipe 44 extending from the vacuum break valve 40. It sprays the supplied wash water.
The vacuum break valve 40 is for sucking air from the outside and preventing the inside of the water supply pipe 44 from the vacuum break valve 40 to the jet nozzle 46 to have a negative pressure.

Next, as shown in FIGS. 3 to 6B, the flow path switching valve 48 of the jet pump unit 42 is provided near the downstream side of the jet nozzle 46, and stores the flow path of the washing water jetted from the jet nozzle 46. It can be switched according to the water level in the tank body 22.
Further, as shown in FIGS. 3 to 6B, the throat pipe 50 of the jet pump unit 42 is provided in the vicinity of the downstream side of the flow path switching valve 48. A suction port 50a is formed at one end (upstream end) of the throat pipe 50, while a discharge port 50b for discharging washing water is formed at the other end (downstream end) of the throat pipe 50.
Further, as shown in FIG. 4, the throat tube 50 has a tube shape extending from the suction port 50a to the discharge port 50b, for example, an inverted U shape (or, in other words, an inverted J shape). Or it is formed in a gooseneck shape).
Here, the jet nozzle 46 is arranged so as to face the suction port 50a of the throat tube 50. The suction port 50a and the jet nozzle 46 of these throat pipes 50 are constantly submerged in the water storage tank main body 22.

Further, as shown in FIGS. 3, 4, 6A and 6B, the flow path switching valve 48 is provided on the toilet bowl body 4 side according to the water level in the water storage tank body 22 with respect to the flow path of the jet-injected washing water. It is possible to switch to either the toilet bowl cleaning flow path 52 that communicates with the toilet bowl or the tank water storage flow path 54 that communicates with the water storage tank main body 22 side.
Specifically, in the toilet bowl cleaning flow path 52, when the bowl portion 6 of the toilet bowl body 4 is cleaned, the suction port 50a of the throat pipe 50 is opened by the flow path switching valve 48, and the toilet bowl cleaning is jet-jetted from the jet nozzle 46. This is a flow path for water to flow into the suction port 50a of the throat pipe 50. The wash water that has flowed into the throat pipe 50 through this flow path flows out of the discharge port 50b of the throat pipe 50, and is discharged from the drain port 14 of the wash water tank device 1 to the headrace 16 side of the toilet bowl body 4. It has become.
On the other hand, in the tank water storage flow path 54, the suction port 50a of the throat pipe 50 is closed by the flow path switching valve 48 when the water storage tank main body 22 is storing water, and the throat pipe 50 is used for the washing water jet-injected from the jet nozzle 46. It is a flow path that is directed into the water storage tank main body 22 outside the throat pipe 50 without flowing into the water.

By the way, when the flow path switching valve 48 is set in the flow path 52 for cleaning the toilet bowl, the jet nozzle 46 jets the cleaning water from the suction port 50a of the throat tube 50 toward the inside, so that the throat tube 50 is jetted. The so-called "jet pumping action" is induced, in which the flow rate of the washing water flowing through the inside is increased more than the flow rate of the washing water ejected from the jet nozzle 46. As a result, the increased flow rate of the washing water is supplied from the discharge port 50b of the throat pipe 50 to the headrace 16 of the toilet body 4 via the drain port 14.
Regarding the term "jet pumping action" described in the present specification, the flow itself of the vigorous washing water jetted from the jet nozzle 46 toward the suction port 50a of the throat tube 50 is a pump or the like. A negative pressure is formed so as to directly draw in the surrounding washing water such as in the vicinity of the suction port 50a of the throat tube 50 without depending on other mechanical elements, and this negative pressure is used in the throat tube 50. It means the action of transporting the washing water in the water storage tank body 22 sucked into the toilet body 4 side.

Further, as shown in FIGS. 4 and 5, an overflow pipe 56 extending in the vertical direction is provided in the water storage tank main body 22. The overflow pipe 56 is provided adjacent to a descending pipe portion 38b extending in the vertical direction of the throat pipe 50 of the jet pump unit 42, and its lower end communicates with the drain port 14.
As a result, the washing water in which the water level in the water storage tank main body 22 rises above the water stop water level and exceeds the position of the overflow port 56a of the overflow pipe 56 flows into the overflow pipe 56 and flows from the drain port 14 to the toilet bowl main body 4 It is designed to be supplied as make-up water to the headrace 16 of the above.
Further, as shown in FIGS. 3 to 6B, a replenishment water channel (replenishment water pipe 58) for connecting a part of the tank water storage flow path 54 and the overflow port 56a is provided in the water storage tank main body 22. As a result, a part of the washing water of the tank water storage flow path 54 shown in FIG. 6B flows into the overflow pipe 56 through the make-up water pipe 58 and is supplied from the drain port 14 to the headrace 16 of the toilet bowl body 4. Eventually, the toilet bowl body 4 is used as make-up water for forming a sealing water.

Next, as shown in FIGS. 4 and 5, the washing water tank device 1 includes a large / small washing switching device 60 provided in the water storage tank main body 22, and the large / small washing switching device 60 may be used for a large washing mode or. It is possible to switch to one of the small cleaning modes.
Further, the large / small cleaning switching device 60 includes a small tank 62 for switching large / small cleaning provided in the water storage tank main body 22, and a large / small cleaning switching valve device 64 provided in the small tank 62.

Next, FIG. 7 is an enlarged partial front sectional view of a water storage tank main body and a small tank portion of the washing water tank device according to the embodiment of the present invention. Further, FIG. 8 is a perspective view of the small tank of the washing water tank device according to the embodiment of the present invention as viewed from diagonally above the front right.
In FIG. 8, a part of the front side wall surface (front partition wall 66a) of the small tank 62 is cut out so that the large / small cleaning switching valve device 64 inside the small tank 62 can be seen.
As shown in FIGS. 4 to 8, the small tank 62 extends in the vertical direction and has a side wall (partition wall 66) extending vertically to partition the external region S1 on the water storage tank main body 22 side and the internal region S2 in the small tank 62. I have. The partition wall 66 forms a wall surface extending in the vertical direction, and the entire small tank 62 is open above the partition wall 66 to form a cup shape surrounding the small tank 62 from all sides in the front-rear direction and the left-right direction. The total length in the direction is longer than the total length in the front-back direction.
Incidentally, the jet nozzle 46, the suction port 50a of the throat pipe 50, and the like are arranged in the outer region S1 of the small tank 62 inside the water storage tank main body 22.

Next, as shown in FIGS. 4 to 8, the small tank 62 is, more specifically, in the water storage tank main body 22 from the left and right sides (right side of FIGS. 4, 7 and 8) to the other in the longitudinal direction. A small tank main body 68 provided so as to extend to the side (left side of FIGS. 4, 7 and 8) and the lower end of the other side (left side of FIGS. 4, 7 and 8) of the small tank main body 68. It is provided with a protrusion 70 that projects downward from the water storage tank body 22 to the basal bottom surface 22a.
Further, as shown in FIGS. 4 and 8, the overall shape of the small tank is longitudinally oriented from one of the left and right sides of the small tank main body 68 (the right side when the small tank main body 68 is viewed from the front side) in the front view. After extending to the other side in the direction (left side when the small tank main body 68 is viewed from the front side), it protrudes downward by the protruding portion 70, and the side wall on the other side in the left-right direction of the small tank main body 68 (small tank main body 68). The side wall on the left side when viewed from the front side) and the left side partition wall 70b on the other side in the left-right direction of the protrusion 70 form an integrally L-shaped wall surface in the vertical direction. That is, the total length of the protruding portion 70 in the left-right direction is shorter than the total length of the small tank main body portion 68 in the left-right direction.
The overall shape of the small tank 62 is not necessarily limited to the form in which the left side wall of the small tank main body 68 and the left side partition wall 70b in the left-right direction of the protrusion 70 form an integral wall surface in the vertical direction. Instead, it extends from one left and right side of the small tank body 68 to the other side in the longitudinal direction, then protrudes downward by the protrusion 70, and then extends from one left and right side of the small tank body 68 to the other side in the longitudinal direction. It suffices to have an approximately L-shaped shape as described above.
Further, a switching opening 72 is provided on the partition wall (right partition wall 70a) on one of the left and right sides (right side of FIGS. 4 and 8) of the protrusion 70.

Further, as shown in FIGS. 6A, 6B and 7, the inside of the water storage tank main body 22 is a basal plane 22a on which the lowest bottom surface 70c of the protrusion 70 of the small tank 62 is installed, and one of the left and right sides of the basal plane 22a. The lowest bottom surface 22b in the jet nozzle accommodating portion H projecting downward is provided in the region (the region on the right side when the water storage tank main body 22 is viewed from the front side).
As a result, the protruding portion 70 of the small tank 62 is formed so as to protrude downward from the lower end of the small tank main body 68 to the basal plane 22a in the water storage tank main body 22.

Next, FIG. 9 is a cross-sectional view taken along the line XI-XI of FIG.
As shown in FIGS. 4 and 7 to 9, the switching opening 72 of the protrusion 70 of the small tank 62 is directed toward the jet nozzle 46 of the jet pump unit 42 and the suction port 50a of the throat pipe 50. Is located in.
Further, the area S1 in the water storage tank main body 22 between the switching opening 72 of the small tank 62 and the suction port 50a of the jet nozzle 46 and the throat pipe 50 was discharged from the switching opening 72 of the small tank 62. A rectifying region (water storage tank main body side rectifying region R1) for rectifying the subsequent washing water is provided.

Next, as shown in FIGS. 4 to 9, the protruding portion 70 of the small tank 62 is provided on one side (right side) in the longitudinal direction of the left and right sides of the small tank 62 with the right side partition wall 70a on which the switching opening 72 is formed. The left partition wall 70b is provided so as to face the other side (left side) in the left-right longitudinal direction with respect to the right partition wall 70a.
Further, a small formed between the first side wall surface which is the wall surface of the right side partition wall 70a of the protrusion 70 of the small tank 62 and the second side wall surface which is the wall surface of the left side partition wall 70b of the protrusion 70. In the internal region S2 of the tank 62, a rectifying region (rectifying region R2 in the small tank) for rectifying the washing water before being discharged from the switching opening 72 in the small tank 62 is provided.
Further, the rectifying region R2 in the small tank is set so that the maximum width dimension L1 [mm] in the left-right direction is larger than the maximum width dimension W1 [mm] in the front-rear direction (L1> W1).

Further, as shown in FIGS. 5 and 9, the maximum width dimension W1 of the protruding portion 70 of the small tank 62 in the front-rear short direction divides the maximum width dimension of the internal region of the water storage tank main body 22 into two equal parts in the short side direction. It is set to be smaller than each maximum width dimension W2 at the time of (W1 <W2).

Next, as shown in FIGS. 4 and 7, the switching opening 72 of the small tank 62 is arranged above the suction port 50a of the throat pipe 50.
Further, as shown in FIG. 9, the water storage tank main body 22 has a longitudinal center axis C1 that bisects the maximum front-rear width dimension of the internal region S2 into the front-rear front region F0 and the rear region B0, respectively, and the inside. A center axis C2 in the lateral direction that bisects the maximum left-right width dimension of the region S2 into one left and right region (right side region R0) and the other side region (left side region L0) is provided.
Further, as shown in FIG. 9, the protruding portion 70 of the small tank 62 is located in the water storage tank body 22 more than the center axis C2 in the lateral direction of the water storage tank body 22 in which the suction port 50a of the throat pipe 50 is arranged. It is arranged in a region (left side region L0) where the suction port 50a on the left and right other side (left side) of the center axis C2 in the lateral direction is not arranged with respect to the left and right one side region (right side region R0).
Further, the protruding portion 70 of the small tank 62 is a longitudinal center axis C1 of the water storage tank body 22 in which the center O1 of the drainage port 14 of the water storage tank body 22 (the center O1 of the discharge port 50b of the throat pipe 50) is arranged. Than the longitudinal center axis C1 of the water storage tank body 22 in which the center O1 of the drainage port 14 (center O1 of the discharge port 50b of the throat pipe 50) is not arranged with respect to the area on one of the front and rear sides (rear side area B0). It is arranged in the front and rear other side regions (front side region F0). As a result, the protruding portion 70 of the small tank 62 is arranged so as to be separated from the suction port 50a of the throat pipe 50.

Next, as shown in FIG. 9, the switching opening 72 is located in the water storage tank main body 22 on one side (right side) of the center axis C2 in the lateral direction provided with the suction port 50a of the throat pipe 50. Region R0) is located in the region on the left and right sides of the center axis C2 in the lateral direction (left region L0) where the suction port 50a is not provided, and is located in the region in front of the center axis C1 in the longitudinal direction (region R0). It is arranged in the front area F0).
Further, as shown in FIG. 9, the switching opening 72 includes a central axis C3 that passes through the center O2 of the opening cross section and extends in the left-right longitudinal direction of the water storage tank main body 22. The central axis C3 of the switching opening 72 is arranged so as to be separated from the central axis C4 in the longitudinal direction of the throat pipe 50 on one side (front side) in the front-rear direction of the water storage tank body 22 in the plan view of FIG. Has been done.

Next, the details of the large / small cleaning switching valve device 64 will be described with reference to FIGS. 4, 5, 7, 8, 10, and 11A to 11D.
First, FIG. 10 is a partially enlarged perspective view of an enlarged portion of the large / small cleaning switching valve device of the washing water tank device according to the embodiment of the present invention shown in FIG. 11A to 11D are enlarged views of a portion of the large / small cleaning switching valve device in the cleaning water tank device according to the embodiment of the present invention.
In particular, FIG. 11A shows a standby state before starting the toilet bowl cleaning operation and a valve opening state of the switching valve body of the large / small cleaning switching valve device in the state where the large / small cleaning operation of the toilet bowl is started. Further, FIG. 11B shows a closed state of the switching valve body of the large / small cleaning switching valve device in the state where the small cleaning operation of the toilet bowl is started. Further, FIG. 11C shows a closed state of the switching valve body of the large / small cleaning switching valve device during the small cleaning of the toilet bowl. Further, FIG. 11D shows a state in which the small cleaning of the toilet bowl is completed and the switching valve body of the large / small cleaning switching valve device in the closed state is opened during the water supply from the water supply valve device to the inside of the water storage tank body.

As shown in FIGS. 4, 5, 7, 8, 10, and 11A to 11D, the large / small cleaning switching valve device 64 includes a switching valve body 74, a swing member 76, and a ball chain 78. It is equipped with a pull-up lever 80.
First, as shown in FIGS. 10 to 11D, the bottom surface 68a of the small tank main body 68 is provided with a pair of support portions 68b that are arranged in pairs in the front-rear direction and project upward.
Further, hinge protrusions 68c protruding in the front-rear direction are provided on the surfaces of the support portions 68b facing each other in the front-rear direction.
The switching valve body 74 of the large / small cleaning switching valve device 64 includes a pair of supported portions 74a that are arranged in pairs in the front-rear direction and supported by the supporting portions 68b of the small tank main body portion 68. Each supported portion 74a is provided with a hinge hole 74b that can be connected to each hinge projection 68c.
That is, each hinge protrusion 68c and each hinge hole 74b are provided near the upper portion of the switching opening 72, and are hinge portions that make the switching valve body 74 rotatable. As a result, the switching valve body 74 can rotate around the central axis of each hinge projection 68c in the front-rear direction and the central axis (hinge axis C5) of each hinge hole 74b, with respect to the switching opening 72. It can be opened and closed.
Then, by opening and closing the switching opening 72 of the switching valve body 74, the amount of washing water supplied to the toilet bowl main body 4 through the jet pump unit 42 can be changed, and large washing and small washing can be switched. It has become.

Next, as shown in FIGS. 10 to 11D, the swing member 76 of the large / small cleaning switching valve device 64 is provided so as to be swingable with respect to the swing shaft 74c protruding in the front-rear direction of the switching valve body 74. ..
The swing member 76 is arranged on the bottom surface 68a of the small tank body 68 so as to support the switching valve body 74 from below when the switching valve body 74 is in a state of being opened in a substantially horizontal posture. There is.
Further, one end of the ball chain 78 is connected to a part of the swing member 76.
Further, as shown in FIGS. 11A to 11B, the pull-up lever 80 of the large / small cleaning switching valve device 64 is connected to the drive rotation shaft 32b of the operating device 32. Further, the other end of the ball chain 78 is connected to a part of the pulling lever 80.

As a result, the switching valve body 74 of the large / small cleaning switching valve device 64 is connected to the drive rotary shaft 32b of the water supply valve device 28 via the swing member 76, the ball chain 78, and the pull-up lever 80. ..
For example, as shown in FIG. 11A, in the standby state before starting the toilet bowl cleaning operation, the ball chain 78 is in a loosened state, and the switching valve body 74 is in a state in which the switching opening 72 is opened in a horizontal posture. ing.
Then, as shown in FIG. 11A, in the state where the large cleaning operation of the toilet bowl is started, the operation lever 32a is rotated in one direction by the user, and the drive rotation shaft 32b is rotated in one direction. There is.
However, since the pulling lever 80 does not rotate integrally with the drive rotation shaft 32b and is in a stationary state, the ball chain 78 is not pulled up by the pulling lever 80 and is in a slackened state. As a result, the switching valve body 74 is maintained in a state in which the switching opening 72 is opened.

Next, as shown in FIG. 11B, in the state where the small cleaning operation of the toilet bowl is started, the operation lever 32a is rotated in the other direction by the user, and the drive rotation shaft 32b is rotated in the other direction. ing.
As a result, the pulling lever 80 rotates integrally with the drive rotation shaft 32b, so that the ball chain 78 is pulled up by the pulling lever 80.
Then, when the ball chain 78 is pulled up, the swing member 76 swings around the swing shaft 74c of the switching valve body 74 so that the tip portion thereof rises, and the switching valve body 74 and the swing member The entire 76 is in a standing position.
Further, the switching valve body 74 is in a state where the switching opening 72 is closed due to the posture of standing up in the vertical direction.
At this time, as shown in FIG. 11B, the water level WL1 in the water storage tank main body 22 in the external region S1 of the small tank 62 is lower than the water level WL2 in the internal region S2 of the small tank 62, and the inside of the small tank 62. Since the water pressure P2 in the region S2 is higher than the water pressure P2 in the water storage tank main body 22 in the external region S1 of the small tank 62 (P2> P1), the water level difference ΔWL (= WL2-WL1) and the water pressure difference ΔP By (= P2-P1), the valve closed state of the switching valve body 74 is maintained.

Next, as shown in FIG. 11C, during the small cleaning of the toilet bowl, the pulling lever 80 is rotated so as to return to the original state before being pulled up (standby state in FIG. 11A), and the drive rotation shaft 32b is also rotated. , It is designed to rotate in one direction integrally with the pulling lever 80.
At this time, the swing member 76 also swings in the direction of returning to the standby state independently of the switching valve body 74 so as to be in a horizontal posture.
At this time, as shown in FIG. 11C, the water level WL1 in the water storage tank main body 22 in the external region S1 of the small tank 62 is lower than the water level WL2 in the internal region S2 of the small tank 62, and the inside of the small tank 62. Since the water pressure P2 in the region S2 is higher than the water pressure P2 in the water storage tank main body 22 in the external region S1 of the small tank 62 (P2> P1), the water level difference ΔWL (= WL2-WL1) and the water pressure difference ΔP By (= P2-P1), the valve closed state of the switching valve body 74 is maintained.
Further, during the small cleaning of the toilet bowl, the swing member 76 rotates (swings) independently of the switching valve body 74, so that the ball chain 78 itself interferes with the switching valve body 74 to open the valve. Is avoided, and the valve closed state of the switching valve body 74 is maintained.
Here, as shown in FIG. 8, the bottom surface 68a on one of the left and right sides of the small tank main body 68 (the right side when the small tank main body 68 is viewed from the front side) has an internal region S2 and an external region S1 of the small tank 62. A communication small hole 68d for communicating with (inside the water storage tank main body 22) is provided. As a result, the water level WL2 of the washing water in the small tank 62 is in a state where the switching opening 72 is closed by the switching valve body 74, but the water level is slightly lowered, but in the water storage tank main body 22. The water level is higher than the water level WL1 (WL2> WL1) (see FIG. 11C).
By the way, during the large cleaning operation of the toilet bowl, the cleaning water existing at a position far from the switching opening 72 in the small tank 62 is discharged from the communication small hole 68d to the external region S1 of the small tank 62, so that the inside of the small tank 62 It is possible to reduce the residual water of the washing water.

Next, as shown in FIG. 11D, when the water level WL1 of the washing water in the water storage tank main body 22 drops to the water level DWL1, the flow path switching valve 48 is switched to the water storage flow path 54, and the jet nozzle 46 is washed. The water is switched from the water supply to the throat pipe 50 to the water supply to the water storage tank main body 22, the small cleaning of the toilet bowl is completed, and the water is supplied to the water storage tank main body 22.
As a result, the water level (water level in the water storage tank body 22) WL1 in the outer region S1 of the small tank 62 rises, and becomes the same water level (WL1 = WL2) as the water level WL2 of the washing water in the small tank 62, and the water level difference ΔWL (= WL2-WL1) and the water pressure difference ΔP (= P2-P1) are 0.
At this time, since the switching valve body 74 is provided with a weight 74d (see FIGS. 10 and 11D) on the swing member 76 side, the balance between the weight of the weight 74d and the center of gravity of the switching valve body 74 is opened. It is adjusted in the direction of the valve state. As a result, the switching valve body 74 rotates so as to be in a horizontal posture, and is in a valve open state.
Further, since the switching valve body 74 is provided with the weight 74d, when the cleaning water in the small tank 62 is discharged from the switching opening 72 to the external region S1 of the small tank 62 during the large cleaning operation. The flow of the washing water in the small tank 62 prevents the switching valve body 74 from being erroneously closed.
Further, as shown in FIG. 6B, in the jet nozzle accommodating portion H of the water storage tank main body 22, the flow path switching valve 48 is switched to the tank water storage flow path 54, so that the washing water jetted from the jet nozzle 46 is sprayed. Is not flowed into the throat pipe 50, but is supplied into the water storage tank main body 22.

As shown in FIG. 4, the water level WL in the water storage tank main body 22 has the following positions.
First, as shown in FIG. 4, the water level DWL1 indicates the lowest water level of the region S1 in the water storage tank main body 22 when each of the large washing and the small washing of the toilet bowl is completed, and is from the lower end of the switching opening 72. Is also located below.
Next, as shown in FIG. 4, the water level DWL1 is the lowest water level of the region S1 in the water storage tank main body 22 when each of the large washing and the small washing is completed, and the water level DWL2 is when the small washing is completed. The lowest water level of the region S2 in the small tank 62 of the above is shown.
Further, as shown in FIG. 4, the water level WL0 is the still water level (maximum water level) in the initial state (standby state) of the washing water stored in the water storage tank main body 22. The water stop water level WL0 indicates a normal water stop water level before or after the use of the flush toilet bowl 2, and is located slightly above the water level DWL2.
Incidentally, the water level WL1 shown in FIG. 4 is the water level in the region S1 in the water storage tank main body 22 during the water level decrease or the water level is increasing, and is higher than the minimum water level DWL1 and lower than the maximum water level WL0. There is.
Further, the water level WL2 shown in FIG. 4 is the water level in the region S2 in the small tank 62 while the water level is decreasing or the water level is increasing, which is higher than the minimum water level DWL2 and lower than the maximum water level WL0. ..

Next, the operation of the washing water tank device 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 12.
FIG. 12 is a flowchart showing the operation flow of the washing water tank device according to the embodiment of the present invention.
As shown in FIG. 12, when either the large washing or the small washing of the flush toilet bowl 2 is performed, first, in step S1, the operating lever 32a of the operating device 32 is rotated by the user.
Specifically, when the operation lever 32a is rotated in one direction (for example, the cleaning water tank device 1 is rotated toward the front side (large cleaning side) when viewed from the front side), the large cleaning mode is started. When the operation lever 32a is rotated in the other direction (for example, the cleaning water tank device 1 is rotated to the back side (small cleaning side) when viewed from the front side), the small cleaning mode is started.

Next, the large cleaning mode will be described below.
In the state where the large cleaning mode is started, the drive rotation shaft 32b of the operating device 32 is rotated in one direction by the rotation operation of the operating lever 32a, but the pulling lever 80 of the large / small cleaning switching valve device 64 is driven and rotated. It is in a stationary state without rotating integrally with the shaft 32b.
As a result, the ball chain 78 is not pulled up by the pulling lever 80 and is in a loosened state, so that the swing member 76 is not pulled up by the ball chain 78.
Further, the switching valve body 74 is in a substantially horizontal posture on the swing member 76 due to the weight of the weight 74d of the switching valve body 74, and the swing member 76 is pressed against the bottom surface 68a of the small tank main body portion 68. Will be. As a result, the switching valve body 74 is maintained in a state in which the switching opening 72 is opened (see FIG. 11A).

Next, in step S2 of FIG. 12, the poppet valve 34 of the water supply valve device 28 is opened by the rotation of the drive rotation shaft 32b of the operating device 32 in one direction.
At this time, since the water storage tank main body 22 is filled with the washing water near the water stop water level (maximum water level) WL0, the flow path switching valve 48 of the jet pump unit 42 has a buoyancy due to the washing water in the water storage tank main body 22. The suction port 50a of the throat pipe 50 is opened by the flow path switching valve 48.
Then, in step S4 of FIG. 12, when the poppet valve 34 of the water supply valve device 28 is opened, the washing water flows out from the pressure chamber 30c of the water supply valve device 28 in step S4, and the pressure in the pressure chamber 30c decreases. ..
As a result, the main valve body 30a in the water supply valve (main valve 30) of the water supply valve device 28 moves so as to be separated from the main valve seat 30b and opens, and the water supply valve is opened from the water supply pipe 24 via the constant flow valve 26. The wash water supplied to the device 28 is supplied from the water supply valve device 28 into the water supply pipe 44 on the downstream side.
After that, the washing water in the water supply pipe 44 is supplied to the jet nozzle 46 of the jet pump unit 42 via the vacuum break valve 40. The washing water supplied to the jet nozzle 46 is injected toward the suction port 50a of the throat pipe 50 via the toilet bowl cleaning flow path 52 of the flow path switching valve 48, and jet water discharge is started (see FIG. 6A). ..
Further, when the jet water discharge is started, the flow itself of the vigorous washing water jetted from the jet nozzle 46 toward the suction port 50a of the throat pipe 50 does not depend on other mechanical elements such as a pump. A negative pressure is formed that directly draws in the surrounding wash water such as in the vicinity of the suction port 50a of the throat pipe 50, and the wash water in the water storage tank body 22 sucked into the throat pipe 50 using this negative pressure. The so-called "jet pump action" occurs, in which the water is transported to the toilet body 4 side.

Further, when the jet water discharge is continued, in step S5 of FIG. 12, the water level WL1 in the water storage tank main body 22 drops, so that the float 36 of the water supply valve device 28 descends and the float side pilot valve 38 opens. ..
At this time, since the internal region S2 and the external region S1 (region S1 in the water storage tank main body 22) of the small tank 62 are communicated with each other by the open switching opening 72 of the small tank 62 and the communication small hole 68d, the small tank 62 is small. The water level WL2 in the tank 62 also drops together with the water level WL1 in the water storage tank main body 22.
When the water level WL1 in the water storage tank body 22 and the water level WL2 in the small tank 62 drop to the minimum water level DWL1, the buoyancy of the washing water in the water storage tank body 22 acting on the flow path switching valve 48 of the jet pump unit 42. Also declines.
As a result, the flow path switching valve 48 of the jet pump unit 42 is in a state of being switched to the tank water storage flow path 54, and the suction port 50a of the throat pipe 50 is in a state of being closed by the flow path switching valve 48. See FIG. 6B).
Therefore, the washing water jetted from the jet nozzle 46 is supplied into the water storage tank main body 22 from the tank water storage flow path 54 of the flow path switching valve 48. At the same time, a part of these washing waters is replenished from the replenishment water pipe 58 into the overflow pipe 56, and then replenished to the toilet bowl main body 4.
The wash water replenished on the toilet bowl body 4 side is used when forming a sealing water on the toilet bowl body 4.

Next, in step S7 of FIG. 12, when the water level WL1 in the water storage tank body 22 rises due to the water supply from the tank water storage flow path 54 of the flow path switching valve 48 into the water storage tank body 22, the rising water level WL1 The float 36 of the water supply valve device 28 rises due to the buoyancy on which the wash water acts, and the float side pilot valve 38 closes. Since the small tank 62 communicates with the open switching opening 72 and the communication small hole 68d, the water level WL2 in the small tank 62 also rises together with the water level WL1 in the water storage tank main body 22.
As a result, the pressure in the pressure chamber 30c of the water supply valve device 28 becomes the primary side flow path pressure α again, the city main valve body 30a moves toward the main valve seat 30b, and finally the main valve 30 is closed. (Water stop state).
At this time, in step S8 of FIG. 12, since the water storage tank main body 22 is filled with the washing water having the water stop water level (maximum water level) WL0, the flow path switching valve 48 of the jet pump unit 42 is inside the water storage tank main body 22. Due to the buoyancy of the washing water, the flow path 52 is switched to the toilet bowl cleaning flow path 52 again, and the suction port 50a of the throat pipe 50 is opened by the flow path switching valve 48.
Then, in step S9 of FIG. 12, when the water storage in the water storage tank main body 22 is completed, the large cleaning mode is completed and the standby state is set (see FIG. 11A).

Next, the small cleaning mode will be described below.
First, in step S1 of FIG. 12, in the state where the small cleaning mode is started, the drive rotation shaft 32b of the operation device 32 is rotated in the other direction by the rotation operation of the operation lever 32a.
Then, in step S2 of FIG. 12, the poppet valve 34 of the water supply valve device 28 is opened, the flow path switching valve 48 of the jet pump unit 42 is switched to the toilet bowl cleaning flow path 52, and the throat pipe 50 is set. The suction port 50a is opened by the flow path switching valve 48.

Next, in step S3 of FIG. 12, the pull-up lever 80 of the large / small cleaning switching valve device 64 is interlocked with the drive rotation shaft 32b (rotates integrally with the drive rotation shaft 32b), and the ball chain 78 is pulled up by the pull-up lever 80. Will be pulled up by.
Then, when the ball chain 78 is pulled up, the swing member 76 swings around the swing shaft 74c of the switching valve body 74 so that the tip portion thereof rises, and the switching valve body 74 and the swing member The entire 76 is in a standing posture (see FIG. 11B).
Further, the switching valve body 74 is in a state where the switching opening 72 is closed due to the posture of standing up in the vertical direction.

Next, as in the large cleaning mode, in step S4 of FIG. 12, the water supply valve (main valve 30) of the water supply valve device 28 is opened, and the cleaning water is discharged from the jet nozzle 46 toward the suction port 50a of the throat pipe 50. Is jetted and jet spouting is started (see FIG. 6A).
Then, as in the large cleaning mode, in step S5 of FIG. 12, as the jet water discharge is continued, the water level WL1 in the water storage tank main body 22 is lowered, so that the float 36 of the water supply valve device 28 is lowered and the float is floated. The side pilot valve 38 opens.

At this time, as shown in FIGS. 11B and 11C, the water level WL1 in the water storage tank main body 22 in the external region S1 of the small tank 62 is lower than the water level WL2 in the internal region S2 of the small tank 62, and the small tank The water pressure P2 in the inner region S2 of 62 becomes higher than the water pressure P2 in the water storage tank main body 22 in the outer region S1 of the small tank 62 (P2> P1). Then, the closed state of the switching valve body 74 is maintained by the water level difference ΔWL (= WL2-WL1) and the water pressure difference ΔP (= P2-P1).

Next, in step S6 of FIG. 12, when the water level WL1 in the water storage tank main body 22 further drops to the minimum water level DWL1 and the water level WL2 in the small tank 62 drops to the minimum water level DWL2, the small cleaning of the toilet bowl ends. (See FIG. 11D).
At this time, as shown in FIG. 6B, in the jet nozzle accommodating portion H of the water storage tank main body 22, the flow path switching valve 48 is switched to the tank water storage flow path 54, so that the cleaning jet is jetted from the jet nozzle 46. The water is supplied into the water storage tank main body 22 without flowing into the throat pipe 50. At the same time, a part of these washing waters is replenished from the replenishment water pipe 58 into the overflow pipe 56, and then replenished to the toilet bowl main body 4.
After that, by further supplying water to the water storage tank main body 22, the water level (water level in the water storage tank main body 22) WL1 in the external region S1 of the small tank 62 rises, and becomes the water level WL2 of the washing water in the small tank 62. The water level in the main body of the water storage tank is the same as the water level WL1 (WL1 = WL2). As a result, the water level difference ΔWL (= WL2-WL1) and the water pressure difference ΔP (= P2-P1) become 0, and the water level difference and the water pressure difference that keep the switching valve body 74 in the closed state disappear. Due to the balance between the weight of the weight 74d (see FIGS. 10 and 11D) on the swing member 76 side and the center of gravity of the switching valve body 74, the weight 74d rotates toward the swing member 76 so as to have a horizontal posture, and the valve is opened. It becomes a state.

Next, as in the large cleaning mode, in step S7 of FIG. 12, the water level WL1 in the water storage tank body 22 rises due to the water supply from the tank water storage flow path 54 of the flow path switching valve 48 into the water storage tank body 22. The float 36 of the water supply valve device 28 rises due to the buoyancy acted by the washing water of the raised water level WL1, and the float side pilot valve 38 closes. As a result, the main valve 30 of the water supply valve device 28 is closed and the water is stopped.
At this time, since the small tank 62 communicates with the open switching opening 72 and the communication small hole 68d, the water level WL2 in the small tank 62 also rises together with the water level WL1 in the water storage tank main body 22.
Further, as in the large cleaning mode, in step S8 of FIG. 12, since the water storage tank main body 22 is filled with the cleaning water having the water stop water level (maximum water level) WL0, the flow path switching valve 48 of the jet pump unit 42 is used. The buoyancy of the washing water in the water storage tank body 22 causes the flow path 52 to be switched to the toilet bowl cleaning flow path 52 again, and the suction port 50a of the throat pipe 50 is opened by the flow path switching valve 48.
Then, similarly to the large cleaning mode, in step S9 of FIG. 12, when the water storage in the water storage tank main body 22 is completed, the small cleaning mode is completed and the standby state is set (see FIG. 11A).

Next, the operation of the washing water tank device 1 according to the embodiment of the present invention will be described with reference to FIGS. 1 to 12.
According to the washing water tank device 1 according to the embodiment of the present invention described above, for example, when the operation lever 32a of the operating device 32 is operated when starting the large washing of the toilet bowl main body 4 of the flushing toilet bowl 2, water is supplied. The poppet valve 34 of the valve device 28 opens and the water supply valve (main valve 30) opens, and the switching valve body 74 of the large / small cleaning switching valve device 64 opens. The switching opening 72 is opened (see FIG. 11A).
As a result, the washing water supplied from the water supply source (not shown) to the water supply pipe 24 passes through the main valve 30 of the water supply valve device 28 and is supplied to the jet nozzle 46 of the jet pump unit 42.
Then, as shown in FIG. 6A, the washing water is jetted from the jet nozzle 46 toward the suction port 50a of the throat pipe 50, and the jet pump action is induced in the water storage tank main body 22.
Further, due to this jet pump action, the flow itself of the vigorous washing water jetted from the jet nozzle 46 toward the suction port 50a of the throat pipe 50 is directly independent of other mechanical elements such as a pump. A negative pressure is formed in the vicinity of the suction port 50a of the throat tube 50 to draw in the surrounding washing water.
Then, the washing water in the water storage tank main body 22 sucked into the throat pipe 50 by this negative pressure is pressure-fed to the toilet bowl main body 4 side. As a result, a large amount of washing water is supplied from the water storage tank main body 22 to the toilet bowl main body 4, and the large washing toilet bowl washing is executed in the toilet bowl main body 4.
At this time, the switching opening 72 of the small tank 62 opened and closed by the switching valve body 74 of the large / small cleaning switching valve device 64 is arranged so as to be directed toward the jet nozzle 46 of the jet pump unit 42 (FIG. 9). As a result, the washing water in the small tank 62 for switching between large and small washing is sucked from the switching opening 72 of the small tank 62 by the suction force of the mainstream of the washing water jetted from the jet nozzle 46 to the suction port 50a of the throat pipe 50. It forms a flow that draws toward the suction port 50a of the throat tube 50 and the jet nozzle 46.
As a result, the washing water W in the small tank 62 can be smoothly discharged from the switching opening 72 of the small tank 62 toward the suction port 50a of the throat pipe 50.
Further, the washing water W after being discharged from the switching opening 72 in the small tank 62 is rectified by the water storage tank main body side rectifying region R1 between the switching opening 72 of the small tank 62 and the jet nozzle 46. , It is attracted toward the suction port 50a of the throat tube 50 and the jet nozzle 46, and is smoothly supplied to the vicinity of the suction port 50a of the throat tube 50.
Therefore, a smooth flow of the washing water W discharged from the switching opening 72 of the small tank 62 toward both the suction port 50a of the throat pipe 50 and the jet nozzle 46 is formed, so that the small tank 62 at the time of large washing is formed. The residual water inside can be reduced.
As a result, the wash water W after being discharged from the switching opening 72 of the small tank 62 is a water storage tank together with the main wash water in the water storage tank main body 22 previously stored in the external region S1 of the small tank 62. The water is smoothly discharged from the throat pipe 50, which is the drainage channel of the main body 22, to the toilet body 4 side.
Further, in general, the flow of the washing water W discharged from the switching opening 72 of the small tank 62 toward the vicinity of the suction port 50a of the throat pipe 50 is a water storage tank previously stored in the external region S1 of the small tank 62. When the main washing water in the main body 22 collides with the main flow toward the suction port 50a of the throat pipe 50, the flow of the washing water is disturbed. As a result, the efficiency with which the washing water in the water storage tank main body 22 is supplied into the throat pipe 50 by the jet pump action is lowered, and the supply performance of the entire washing water supplied from the water storage tank main body 22 side to the toilet bowl main body 4 side is improved. There is a risk of deterioration.
On the other hand, in the washing water tank device 1 of the present embodiment, in the region S1 in the water storage tank main body 22 between the switching opening 72 of the small tank 62 for switching between large and small washing and the jet nozzle 46, the rectifying region (water storage). The tank body side rectifying region R1) could be provided.
As a result, regarding the flow of the washing water W discharged from the switching opening 72 of the small tank 62 toward the vicinity of the suction port 50a of the throat pipe 50, the inside of the water storage tank main body 22 previously stored in the external region S1 of the small tank 62. The main washing water of the above can be rectified in advance in the rectifying region R1 on the main body side of the water storage tank and merge with the main flow toward the vicinity of the suction port 50a of the throat pipe 50 in a stabilized state.
Therefore, the entire washing water in the water storage tank main body 22 can be stably supplied into the throat pipe 50 from the suction port 50a of the throat pipe 50 by the action of a jet pump, and the drain port 14 is provided from the discharge port 50b of the throat pipe 50. It is also possible to improve the discharge efficiency of discharging to the toilet body 4 side.
Further, a water storage tank main body side rectifying region R1 is provided between the switching opening 72 of the small tank 62 and the jet nozzle 46. As a result, the suction port 50a of the throat pipe 50 by the jet pump action is used for the distance to the suction port 50a of the throat pipe 50, the switching opening 72 of the small tank 62 with respect to the jet nozzle 46, and the switching valve body 74 of the large / small cleaning switching valve device 64. The suction force from the side can be ensured to such an extent that it does not interfere with the opening / closing operation of the switching valve body 74 of the large / small cleaning switching valve device 64. Therefore, the switching valve body 74 of the large / small cleaning switching valve device 64 can be stably operated.
From the above, it is possible to improve the flow of the washing water in the entire water storage tank body 22, improve the supply performance of the washing water supplied from the water storage tank body 22 to the toilet bowl body 4, and reduce the size of the entire water storage tank body 22. Can be realized.

Further, according to the washing water tank device 1 according to the present embodiment, when the switching valve body 74 of the large / small washing switching valve device 64 is opened, its upper end is near the upper surface of the switching opening 72 of the small tank 62. When it is possible to move downward from the switching valve body 74, when the washing water in the small tank 62 is discharged from the switching opening 72 in the state where the switching valve body 74 is opened, the switching opening of the small tank 62 There is an increased risk that there is something that hinders the discharge of the washing water W, such as a part of the switching valve body 74 remaining near the bottom surface of the 72. This causes the generation of residual water in the small tank 62, and there is a problem that the discharge efficiency of the switching opening 72 of the small tank 62 is lowered.
On the other hand, according to the washing water tank device 1 of the present embodiment, the lower end of the switching valve body 74 of the large / small washing switching valve device 64 is near the bottom surface of the switching opening 72 of the small tank 62 when the valve is opened. When the washing water in the small tank 62 is discharged from the switching opening 72 in the state where the switching valve body 74 is opened, the switching opening 72 of the small tank 62 There is nothing near the bottom that prevents the drainage of wash water.
Therefore, the residual water in the small tank 62 can be reduced.

Further, according to the washing water tank device 1 according to the present embodiment, the switching valve body 74 of the large / small washing switching valve device 64 has a pair of supported portions 74a as hinge portions provided near the upper portion of the switching opening 72. The hinge hole 74b is provided, and the hinge hole 74b of each supported portion 74a is rotatably connected to the hinge protrusion 68c of the pair of support portions 68b on the bottom surface 68a of the small tank main body portion 68.
Further, when the switching valve body 74 is opened, the lower end portion of the switching valve body 74 connects the hinge axis C5 of the hinge portion (each hinge projection 68c and each hinge hole 74b) from the vicinity of the bottom surface of the switching opening 72 of the small tank 62. It is provided in the center so as to rotate toward an upward position.
As a result, the opening / closing operation of the switching valve body 74 of the large / small cleaning switching valve device 64 can be executed more smoothly.

Further, according to the washing water tank device 1 according to the present embodiment, if the rectifying region R2 in the small tank is not provided, the washing water in the small tank 62 stays in the protruding portion 70, and the switching opening is opened. The water is not smoothly discharged from the portion 72 into the rectifying region R1 on the main body side of the water storage tank, and the residual water in the small tank 62 cannot be reduced. As a result, it is necessary to take measures such as setting a large opening cross-sectional area of the switching opening 72 of the small tank 62, and it becomes difficult to reduce the size of the entire water storage tank body 22 due to the increase in size of the small tank 62.
On the other hand, according to the washing water tank device 1 of the present embodiment, one side of the left and right longitudinal directions (the protruding portion 70 is the front surface) of the protruding portion 70 protruding downward from the lower end (bottom surface 68a) of the small tank main body portion 68. A first side wall surface (right side partition wall 70a) including a switching opening 72 on the right side when viewed from the side, and a second side wall surface (left side partition wall 70b) on the other side (left side when the protrusion 70 is viewed from the front side). A rectifying region R2 in a small tank is formed between the two. As a result, the washing water in the small tank 62 can be rectified in advance in the small tank rectifying region R2 before being discharged from the switching opening 72 to the rectifying region R1 on the water storage tank main body side.
Therefore, even if the opening cross-sectional area of the switching opening 72 of the small tank 62 is not set large, the washing water in the small tank 62 is rectified in advance in the rectifying region R2 in the small tank without staying in the protruding portion 70. The water can be smoothly and stably discharged from the switching opening 72 into the rectifying region R1 on the water storage tank body side of the water storage tank body 22, and the residual water in the small tank 62 can be reduced.

Further, according to the washing water tank device 1 according to the present embodiment, since the switching opening 72 of the small tank 62 is arranged above the suction port 50a of the throat pipe 50, the washing water in the small tank 62 is switched. When discharged from the opening 72, the suction port 50a can be submerged.
As a result, when residual water is present in the small tank 62, it is possible to prevent the suction force generated by the mainstream of the washing water jetted from the jet nozzle 46 of the jet pump unit 42 to the suction port 50a of the throat pipe 50 from being generated. can do. Therefore, it is possible to prevent the washing water from being supplied from the water storage tank main body 22 side to the toilet bowl main body 4 side, and to prevent the toilet bowl washing from being completed in an insufficient state.
Further, compared to the suction port 50a of the throat pipe 50 located above the switching opening 72 of the small tank 62, the cleaning water W in the small tank 62 has a suction force and gravity drop due to the jet pump action. By interacting with the action, the small tank 62 can be efficiently discharged from the small tank 62 into the water storage tank main body 22 of the external region S1, and the residual water in the small tank 62 can be reduced.

Further, according to the washing water tank device 1 according to the present embodiment, if the position of the switching opening 72 of the small tank 62 is too close to the position of the suction port 50a of the throat pipe 50, the small tank When the washing water stored in the 62 is discharged from the switching opening 72, more washing water than the washing water in the water storage tank main body 22 of the external region S1 of the small tank 62 is sucked first. The water level in the small tank may drop earlier than the main water level in the water storage tank body.
As a result, a water level difference occurs in which the main water level WL1 in the water storage tank main body 22 in the external region S1 of the small tank 62 is higher than the water level WL2 in the small tank 62. The washing water in the small tank 62 may flow back into the small tank 62 from the switching opening 72 of the small tank 62, and the washing water in the small tank 62 may not be discharged as desired, resulting in residual water.
On the other hand, according to the washing water tank device 1 of the present embodiment, the switching opening 72 of the small tank 62 is provided in the water storage tank body 22 with the suction port 50a of the throat pipe 50. The short side of the water storage tank body 22 that is not provided with the suction port 50a of the throat pipe 50 with respect to the area on one side (right side when the water storage tank body 22 is viewed from the front side) of the central axis C2 in the short side direction. It is arranged in the area on the left and right sides of the direction center axis C2 (on the left side when the water storage tank body 22 is viewed from the front side), and is arranged in the area on the front side of the longitudinal center axis C1 of the water storage tank body 22. .. As a result, it is possible to appropriately secure the relative distance between the switching opening 72 of the small tank 62 and the suction port 50a of the throat pipe 50 while realizing the miniaturization of the entire water storage tank main body 22.
Therefore, the suction force from the suction port 50a side of the throat tube 50 due to the jet pump action can stably act on the switching opening 72 of the small tank 62, so that the water level WL2 in the small tank 62 is outside the switching opening 72. The washing water in the small tank 62 can be supplied from the switching opening 72 to the suction port 50a of the throat pipe 50 in a state where the water level is almost the same as the main water level WL1 in the water storage tank main body 22 of the region S1.
Further, by appropriately separating the switching opening 72 of the small tank 62 from the suction port 50a of the throat pipe 50, the suction force from the suction port 50a side of the throat pipe 50 due to the jet pumping action is a large / small cleaning switching valve device. Since it is possible to suppress interference with the opening / closing operation of the switching valve body 74 of 64, the switching valve body 74 of the large / small cleaning switching valve device 64 can be stably operated.

Further, according to the washing water tank device 1 according to the present embodiment, the central axis C3 that passes through the center O2 of the opening cross section of the switching opening 72 of the small tank 62 and extends in the left-right longitudinal direction of the water storage tank body 22 is the throat pipe 50. It is arranged so as to be separated from the central axis C4 in the longitudinal direction of the water storage tank body 22 on one side (front side) in the front-rear direction.
As a result, the overall size of the water storage tank body 22 can be reduced as compared with the case where the central axis C3 of the switching opening 72 of the small tank 62 is arranged on the same axis as the central axis C4 in the longitudinal direction of the throat pipe 50. At the same time, the relative distance between the switching opening 72 of the small tank 62 and the suction port 50a of the throat pipe 50 can be appropriately secured.
Therefore, the suction force from the suction port 50a side of the throat pipe 50 due to the jet pump action can be stably applied to the switching opening 72 of the small tank 62.

Further, according to the water-washing toilet bowl 2 provided with the washing water tank device 1 according to the present embodiment, the flow of the entire washing water W in the water storage tank main body 22 is improved, and the water is supplied from the water storage tank main body 22 to the toilet bowl main body 4. It is possible to improve the supply performance of the washing water and to reduce the size of the entire water storage tank body 22.

In the washing water tank device 1 of the present embodiment, regarding the switching valve body 74 of the large / small washing switching valve device 64, the lower end portion of the switching valve body 74 at the time of valve opening is centered on the hinge protrusion 68c which is the hinge shaft. Although the form in which the switching opening 72 can be opened by rotating toward the upper position has been described, the present invention is not limited to such a form, and other forms can be applied.
For example, as another embodiment of the large / small cleaning switching valve device 64, the lower end of the switching valve body is located in the vicinity of the bottom surface of the switching opening 72, whereas the lower end of the switching valve body is upward when the valve is opened. The switching opening 72 may be opened by moving vertically.

1 Washing water tank device 2 Washing toilet bowl 4 Toilet bowl body 6 Bowl part 8 Rim part 10 Shelf part 12 Trap drainage channel 12a Trap drainage channel entrance 12b Trap drainage channel ascending pipe 12c Trap drainage channel descending pipe 14 Drainage port 16 Toilet bowl Main body headrace 16a 1st headrace 16b 2nd headrace 18 1st rim spout 20 2nd rim spout 22 Water storage tank body 22a Base bottom inside water storage tank body 22b Lowest bottom inside jet nozzle housing of water storage tank body 24 Water supply pipe 26 Constant flow valve 28 Water supply valve device 30 Main valve (water supply valve)
30a Main valve body 30b Main valve seat 30c Pressure chamber 32 Operation device (operation unit)
32a Operation lever (operation unit)
32b Drive rotation shaft (operation unit)
34 Poppet valve 34a Poppet hole 36 Float 38 Float side pilot valve 38a Float side pilot hole 40 Vacuum break valve 42 Jet pump unit 44 Water supply pipe 46 Jet nozzle 48 Flow switching valve 50 Throat pipe 50a Suction port 50b Discharge port 50c Throat pipe Down pipeline 52 Toilet bowl cleaning flow path 54 Tank water storage flow path 56 Overflow pipe 56a Overflow port 58 Replenishment water pipe 60 Large / small cleaning switching device 62 Small tank for large / small cleaning switching 64 Large / small cleaning switching valve device (large / small cleaning switching valve)
66 Small tank compartment wall 66a Front compartment wall 68 Small tank body 68a Bottom of small tank body 68b Support 68c Hinge protrusion (hinge)
68d Communication small hole 70 Protruding part 70a Right side partition wall of the protruding part (first side wall surface)
70b Left side partition wall of protrusion (second side wall surface)
70c Minimum bottom surface of protrusion 72 Switching opening 74 Switching valve body (valve body of large / small cleaning switching valve)
74a Supported part 74b Hinge hole (hinge part)
74c Swing shaft 74d Weight 76 Swing member 78 Ball chain 80 Pulling lever A Primary side flow path of water supply pipe B Secondary side flow path of water supply pipe B0 Area behind the longitudinal center axis of the water storage tank body C1 Longitudinal center axis that divides the internal area of the water storage tank body into two equal parts, front side area and rear side area C2 Short side central axis that divides the internal area of the water storage tank body into two equal parts, left side area and right side area C3 Central axis that passes through the center of the opening cross section of the switching opening and extends in the left-right longitudinal direction of the water storage tank body C4 Longitudinal central axis of the throat tube in plan view C5 Hinge axis DWL1 When each of the large cleaning and small cleaning is completed Minimum water level in the water storage tank body DWL2 Minimum water level in the small tank when small cleaning is completed F0 Area in front of the longitudinal center axis of the water storage tank body H Jet nozzle accommodating part L0 Short side center of the water storage tank body Area on the left side of the axis L1 Maximum width of the rectification area in the small tank in the left-right direction O1 Center of the drain port of the water storage tank body, center of the discharge port of the throat pipe O2 Center of the opening cross section of the switching opening R0 Water storage tank body Area on the right side of the central axis in the lateral direction R1 Water storage tank body side rectification area R2 Small tank internal rectification area S1 Small tank external area S2 Small tank internal area T Exterior tank W Washing water W1 Small tank protrusion Maximum width dimension in the front-rear and short-side direction, maximum width dimension in the front-rear direction of the rectification area in the small tank W2 Maximum width dimension when the internal area of the water storage tank body is divided into two equal parts in the short-side direction WL0 Water stoppage level, maximum Water level WL1 Water level in the main body of the water storage tank (outer area of the small tank) WL2 Water level in the inner area of the small tank ΔP Water pressure difference ΔWL Water level difference α Primary side pressure

Claims (8)

A wash water tank device that supplies wash water to the toilet bowl body of a flush toilet by jet pump action.
The water storage tank body that makes it possible to store the washing water that cleans the toilet bowl body,
A water supply valve device including a water supply valve that enables the washing water supplied from the water supply source to be supplied and stopped in the water storage tank body.
An operation that enables the valve opening operation of the water supply valve of the water supply valve device and the switching operation for setting the amount of cleaning water supplied to the toilet bowl body to either large or small when starting the toilet bowl cleaning. Department and
At least a part of the jet pump unit is arranged in a state of being submerged in the water storage tank body, and forms a drainage channel of the water storage tank body, the upstream end of which forms a suction port and the downstream end of which is the above. The jet provided with a throat tube forming an outlet connected to the inlet of the headrace of the toilet body, and a jet nozzle for injecting wash water toward the suction port of the throat tube to induce a jet pump action. With the pump unit
A small tank for switching between large and small washing, which is provided in the main body of the water storage tank and forms a small space in which less washing water is stored than the washing water stored in the entire main body of the water storage tank. A small size cleaning switch having a partition wall extending vertically in the main body to partition the internal region and the external region of the small tank, and a switching opening formed so as to penetrate the partition wall. With the tank,
It has a large / small cleaning switching valve that can be opened and closed with respect to the switching opening of the small tank by operating the operation unit, and can switch the amount of cleaning water supplied to the toilet body through the jet pump unit between large and small. death,
The switching opening of the small tank is arranged so as to be directed toward the jet nozzle of the jet pump unit, and the area in the water storage tank body between the switching opening and the jet nozzle is described above. A washing water tank device characterized in that a rectifying area on the main body side of the water storage tank is provided to rectify the washing water after being discharged from the switching opening of the small tank. The large / small cleaning switching valve is provided with a valve body that can open and close the switching opening, and when the valve body is opened, the lower end portion thereof is directed from the vicinity of the bottom surface of the switching opening toward the upper position. The wash water tank device according to claim 1, which is movable. The large / small cleaning switching valve further includes a hinge portion provided near the upper part of the switching opening, and the valve body has a lower end portion thereof from the vicinity of the bottom surface of the switching opening when the valve is opened. The washing water tank device according to claim 2, which is provided so as to be rotatable toward an upward position about a hinge portion. The small tank includes a small tank main body provided so as to extend in the left-right longitudinal direction in the water storage tank main body, and a protruding portion protruding downward from the lower end of the small tank main body.
The protrusions are provided on one side of the left and right longitudinal directions so as to face the first side wall surface on which the switching opening is formed, and on the other side of the left and right longitudinal directions so as to face the first side wall surface. It is equipped with a second side wall surface that has been removed.
In the internal region of the small tank formed between the first side wall surface and the second side wall surface of the protrusion, the washing water before being discharged from the switching opening in the small tank is rectified. There is a rectifying area in the small tank to make it
The washing water tank device according to any one of claims 1 to 3, wherein the rectifying region in the small tank has a maximum width dimension in the left-right direction set to be larger than a maximum width dimension in the front-rear direction. The washing water tank device according to any one of claims 1 to 4, wherein the switching opening of the small tank is arranged above the suction port of the throat pipe. The water storage tank body has a longitudinal central axis that bisects its internal region into front and rear front and rear regions, and bisects the internal region into left and right one-sided regions and other-sided regions. It is equipped with a central axis in the lateral direction.
The switching opening is formed in the water storage tank main body in the lateral direction in which the suction port is not provided with respect to a region on one side of the left and right sides of the central axis in the lateral direction in which the suction port is provided. The washing water tank device according to any one of claims 1 to 5, which is arranged in a region on the left and right sides of the central axis and is arranged in a region on the front side of the longitudinal central axis. The switching opening includes a central axis that passes through the center of the opening cross section and extends in the left-right longitudinal direction of the water storage tank body, and the central axis of the switching opening is the central axis of the throat tube in the longitudinal direction. The washing water tank device according to any one of claims 1 to 6, which is arranged so as to be separated from one side in the front-rear direction of the water storage tank body. A flush toilet equipped with the flush water tank device according to any one of claims 1 to 7.

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