JP7329183B2 - flush toilet - Google Patents

Description

TECHNICAL FIELD The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water supplied from a flush water source to discharge waste.

Conventionally, as described in Patent Document 1 and Patent Document 2, in a flush toilet, a rim water passage is formed inside a rim portion, and the rim water passage extends forward inside the rim portion. a curved portion that bends inward from the outer portion; and an inner portion that extends rearward from the curved portion. There is known one in which cleansing water guided to a water port is discharged backward.

Further, as described in Patent Document 3, in a flush toilet, a left side water passage of a water passage portion is formed inside a rim portion, a folded portion is formed in the left side water passage, and the folded portion is folded back. It is known that cleansing water is spouted from a second spout.

JP 2017-160671 A JP 2017-206958 A Japanese Unexamined Patent Application Publication No. 2017-20213

However, in the flush toilets as described in the above-mentioned Patent Documents 1 and 2, when the flush water is bent relatively sharply from the forward direction to the rearward direction in the rim portion, the bent flow is There is a problem that pressure loss occurs due to separation from the surface of the inner side of the intermediate part between the inner part and the inner part, which weakens the water force and causes turbulence of the flow.
In addition, in the flush toilet as described in the above-mentioned Patent Document 3, the folded portion is arranged toward the slightly outside of the folded channel of the left side water passage, and flush water flows forward in the rim portion. There was a problem that when the flow is relatively sharply bent from the to the rear, the bent flow separates from the inner surface of the folded portion, causing pressure loss, weakening the water force, and causing turbulence in the flow. .

Therefore, the present invention has been made to solve the above-mentioned problems of the prior art, and the curved flow separates from the surface on the inner side of the intermediate portion, causing pressure loss and weakening of the water force. To provide a flush toilet capable of suppressing turbulence of flow.

In order to achieve the above object, one embodiment of the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source to discharge waste, comprising: a bowl-shaped waste receiving surface; a rim portion formed on the upper edge of the receiving surface; a drainage channel connected to the lower part of the bowl portion for discharging waste; a rim water spouting portion for spouting water to form a swirling flow in the bowl portion, wherein the rim water spouting portion is provided in the rim portion on either the left or right side of the bowl portion and supplied washing water. forms a rim water passage through which water flows, and a rim water outlet portion is formed at the downstream end of the rim water passage for discharging wash water backward, and the rim water passage extends forward through the inside of the rim portion. an outer portion extending toward the upper surface; a bent portion bent inward from a downstream end of the outer portion; and an inner portion extending rearward from the bent portion to the rim spout portion; A top portion that is farthest from an intermediate portion provided between the inner portion and the outer portion in the direction in which the intermediate portion extends, the top portion extending along the center of the intermediate portion. It is characterized by comprising the top portion formed closer to the outer side than the imaginary center line.
In one embodiment of the present invention configured as described above, the rim water spouting portion forms a rim water spouting portion at the downstream end of the rim water passage for spouting cleansing water backward, and the rim water passage: An outer portion extending forward inside the rim portion, a bent portion bending inward from a downstream end of the outer portion, and an inner portion extending rearward from the bent portion to the rim spout portion. ,ing. In such a rim water passage that bends from the front to the rear, the bent portion is the farthest from the intermediate portion provided between the inner portion and the outer portion in the direction in which the intermediate portion extends in top view. The top portion is formed on the outer side of the imaginary center line extending along the center of the intermediate portion. As a result, when the wash water is bent relatively sharply from the forward direction to the rearward direction within the rim portion, the bent flow separates from the surface on the inner side of the intermediate portion, causing pressure loss and weakening the water force. It is possible to suppress the turbulence of the flow, suppress the weakening of the water force of the flow spouted into the bowl portion from the rim spout portion, and spout a straightened flow. Therefore, it is possible to improve the washing performance of the bowl portion when the wash water that has passed through the rim water passage that curves from the front to the rear is discharged from the rim water discharge portion to the rear of the bowl portion.

In the present invention, preferably, the top portion is arcuate in top view.
In one embodiment of the present invention configured as described above, the top portion is formed in an arc shape when viewed from above, so that the wash water can be bent relatively smoothly along the top portion, and the pressure loss at the top portion is reduced. It is possible to further suppress the weakening of the water force and the occurrence of turbulence in the flow due to the occurrence of , the weakening of the water force of the flow spouted from the rim spout into the bowl portion, and to spout a more rectified flow. . Therefore, it is possible to further improve the washing performance of the bowl portion when the wash water that has passed through the rim water passage that curves from the front to the rear is discharged from the rim water discharge portion to the rear of the bowl portion.

In the present invention, preferably, the radius of curvature of the end portion of the intermediate portion on the bending portion side is smaller than the radius of curvature of the top portion.
In one embodiment of the present invention configured as described above, the radius of curvature of the end portion of the intermediate portion on the bent portion side is smaller than the radius of curvature of the top portion, so that the wash water bent at the top portion When the water flows inward from the end of the section, the flow returning from the top to the end of the intermediate section separates from the inner surface of the intermediate section, causing pressure loss and weakening of the water force. It further suppresses the occurrence of turbulence in the water, making it easier for the wash water to flow along the inner side surface of the intermediate part, further suppressing the weakening of the flow of water discharged from the rim spout into the bowl. It is possible to spout a further rectified flow. Therefore, it is possible to further improve the washing performance of the bowl portion when the wash water that has passed through the rim water passage that curves from the front to the rear is discharged from the rim water discharge portion to the rear of the bowl portion.

In the present invention, preferably, the outer portion of the rim water passage is formed to extend further forward than the intermediate portion, and the outer portion is formed to extend further forward than the inner portion. be done.
In one embodiment of the present invention configured as described above, the outer portion of the rim water passage is formed to extend further forward than the intermediate portion, and the outer portion extends further forward than the inner portion. is formed so as to extend to the front side, compared with the case where the outer portion is not formed to extend further to the front side than the intermediate portion, the flow passage cross-sectional area of the bent portion can be formed relatively large, A change in the cross-sectional area of the flow path from the outer portion to the inner portion via the bent portion can be suppressed. Therefore, when the flow reaches the inner part via the curved part from the outer part, it further suppresses the occurrence of pressure loss, weakening of the water force and turbulence of the flow, and the water is discharged from the rim spout into the bowl part. It is possible to further suppress the weakening of the water force of the flow and to spout a further rectified flow.

In the present invention, preferably, the outer portion of the rim water passage includes a curved portion-side straight portion connected to the curved portion, and the inner portion of the rim water passage connects to the rim water discharge port. Equipped with a straight part on the side.
In one embodiment of the present invention configured as described above, the outer portion of the rim water passage includes a bent portion side straight portion connected to the bent portion, and the inner portion of the rim water passage includes the rim. It has a water discharge side straight portion connected to the water discharge port. As a result, compared to the case where the outer part and the inner part are formed by curved parts, the flow passing through the outer part and the inner part causes pressure loss, which weakens the water force and causes turbulence in the flow. can be further suppressed, the weakening of the flow of water spouted from the rim spout into the bowl can be further suppressed, and a further rectified flow can be spouted.

In the present invention, preferably, the lateral width of the inner portion when viewed from the top is larger than the lateral width of the outer portion when viewed from the top.
In one embodiment of the present invention configured as described above, the lateral width of the inner portion when viewed from the top is larger than the lateral width of the outer portion when viewed from the top. When flowing into the rim, the wash water can easily flow smoothly from the outer part to the inner part with a larger width, further suppressing pressure loss and weakening of the water force and turbulence of the flow. It is possible to further suppress the weakening of the water force of the flow discharged from the water discharge port into the bowl, and to discharge a more rectified flow.

According to the flush toilet bowl of the present invention, it is possible to suppress pressure loss caused by separation of the curved flow from the inner side surface of the intermediate portion, weakening of the water force, and occurrence of turbulence in the flow.

1 is an overall configuration diagram of a flush toilet according to an embodiment of the present invention; FIG. 1 is a plan view of a flush toilet according to one embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1; FIG. 4 is a partially enlarged cross-sectional view showing a state in the vicinity of a bent portion of the rim water conduit in FIG. 3; FIG. 5 is a cross-sectional view taken along line VV of FIG. 4; FIG. 5 is a cross-sectional view taken along line VI-VI of FIG. 4; FIG. 5 is a cross-sectional view taken along line VII-VII of FIG. 4; 1 is a plan view showing a bowl portion and a shelf portion of a flush toilet according to one embodiment of the present invention; FIG. FIG. 3 is a schematic plan view of the shelf for explaining the flow of flush water in the shelf of the flush toilet according to one embodiment of the present invention;

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG.
FIG. 1 is an overall configuration diagram of a flush toilet according to one embodiment of the present invention. 2 is a plan view of the flush toilet according to one embodiment of the present invention, and FIG. 3 is a cross-sectional view taken along line III-III of FIG.
As shown in FIG. 1, a flush toilet 1 according to one embodiment of the present invention includes a main water supply channel 2 through which flush water supplied from a main water supply source W0 (wash water source) such as tap water flows, and a ceramic A toilet body 4 and a flush water supply device 6 are provided. The flush toilet 1 is washed with wash water supplied from the main water supply source W0 to discharge waste.
Hereinafter, in the description of one embodiment of the present invention, the front side as seen from the side of the user who uses the flush toilet 1 (the side of the user standing in front of the flush toilet 1 to use the flush toilet 1) The side is defined as the front side, the back side as viewed from the user is defined as the rear side, the right side as viewed from the front of the flush toilet 1 is defined as the right side, and the left side as viewed from the front is defined as the left side.

Next, as shown in FIGS. 1 and 2, the toilet bowl body 4 includes a bowl portion 8 for receiving waste, a rim portion 10 formed on the upper edge of the bowl portion 8, and a drain extending from the bottom portion of the bowl portion 8. and a drain trap line 12, which is a trap section.
In addition, although the details will be described later, the flush water supply device 6 is provided on the rear side of the bowl portion 8 of the toilet body 4, and can supply the flush water supplied from the main water supply passage 2 to the toilet bowl body 4. It is a functional part that makes More specifically, this function section is operated by electric power and includes a function of controlling discharge of flush water to the bowl section 8 of the toilet body 4 to stop.

The bowl portion 8 includes a bowl-shaped waste receiving surface 9, a rim portion 10 formed at the upper edge of the waste receiving surface 9, and a shelf provided along the entire periphery so as to connect the waste receiving surface 9 and the rim portion 10. a surface 11; The shelf surface 11 is formed as a flat surface between the contaminant receiving surface 9 and the rim portion 10, and forms a slight downward slope inward. The shelf surface 11 extends substantially parallel to the inside of the rim portion 10 so as to be aligned with the rim portion 10 . Therefore, the shelf surface 11 forms straight portions inside the right straight portion 50a and the left straight portion 50b, which will be described later, and forms arcuate portions inside the front and rear arc portions 52, which will be described later. ing.

Next, as shown in FIGS. 2 and 3, the rim portion 10 of the bowl portion 8 discharges wash water supplied from the wash water source into the bowl portion 8 to form a swirling flow in the bowl portion 8. A water discharger 14 is provided. The rim water discharge portion 14 is provided on the rim portion 10 on either the left or right side of the bowl portion 8 of the toilet body 4 (for example, the right side when the toilet body 4 is viewed from the front side). The rim water spouting portion 14 also forms a rim water passage 46 through which the supplied cleansing water flows, and at the downstream end of the rim water passage 46, a rim water spouting portion 48 for spouting cleansing water backward. forming. The rim waterway 46 forms a rim waterway inside the rim portion 10 . The rim water passage 46 extends forward from the rear side of the toilet body 4 inside the rim portion 10 on one of the left and right sides of the toilet body 4 (for example, the right side when viewed from the front side of the toilet body 4). After that, it bends toward the rear side from the middle, forming a so-called U-turn shape. Furthermore, the upstream side of the rim water passage 46 is connected to a rim-side water supply passage 2a of the washing water supply device 6, which will be described later in detail. The wash water supplied from the rim-side water supply passage 2a to the rim water passage 46 is discharged rearward into the bowl portion 8 from the rim spout portion 48 to perform rim spouting.

Next, as shown in FIGS. 1 and 2, a jet conduit 16 is formed from the outer surface of the bowl portion 8 of the toilet body 4 to the bottom. The downstream side of the jet conduit 16 is directed toward the inlet 12a of the drain trap conduit 12 at the bottom of the bowl portion 8, and the jet conduit 16 is provided with a jet outlet 16a at its downstream end. ing.
Further, upstream of the jet water conduit 16 of the toilet bowl main body 4, a jet-side water supply conduit 2b of the flush water supply device 6, which will be described later in detail, is provided. The flush water supplied from the jet-side water supply channel 2b to the jet water conduit 16 of the toilet body 4 is discharged from the jet water spout 16a toward the drain trap pipe 12 for jet water spouting.
Here, as shown in FIG. 1, the upstream side of the rim-side water supply passage 2a of the washing water supply device 6 is connected to a switching valve 18 (details will be described later) of the branch portion B of the main water supply passage 2. FIG.
On the other hand, as shown in FIG. 1, the upstream side of the jet-side water supply passage 2b of the cleansing water supply device 6 is the pressurizing pump of the cleansing water supply device 6 provided downstream of the water storage tank 20 of the cleansing water supply device 6. 22 (details will be described later).

Next, the drainage trap pipeline 12 of the toilet body 4 is connected to the lower portion of the bowl portion 8 to form a drainage path for discharging waste. The drain trap pipe line 12 is composed of an inlet portion 12a provided at the bottom of the bowl portion 8, a trap ascending pipe 12b rising from the inlet portion 12a, and a trap descending pipe 12c descending from the trap ascending pipe 12b, A top portion 12d is provided between the trap ascending pipe 12b and the trap descending pipe 12c. Further, as shown in FIG. 1, the outlet 12e of the trap descending pipe 12c of the drain trap pipeline 12 is connected to the inlet of a drain socket S arranged behind and below the toilet body 4. As shown in FIG. Furthermore, as shown in FIG. 1, the rear outlet of the drain socket S is connected to the inlet of a drain pipe D extending from the rear wall (not shown) of the toilet body 4 . A pool of water is formed above the connecting portion between the dirt receiving surface 9 and the drain trap pipe 12 . In this embodiment, water is discharged from the drain trap pipe 12 to the drain pipe D on the wall behind the flush toilet bowl 1. However, it is not limited to the wall drain, and a drain socket for draining to the floor is provided. It may be connected and drained to a drain pipe provided in the floor.

Next, each configuration of the flush water supply device 6 of the flush toilet 1 according to the present embodiment will be schematically described with reference to FIG.
First, as shown in FIG. 1, the washing water supply device 6 includes a stop cock 24, a branch fitting 26, a valve unit 28, and a switching valve 18 from the upstream side to the downstream side of the main water supply passage 2. I have.
Next, the valve unit 28 includes a constant flow valve 30, a diaphragm type main valve 32, and an electromagnetic valve 34 such as a solenoid valve.
The cleaning water supply device 6 also includes a controller 36 . The controller 36 incorporates an arithmetic device such as a CPU and a storage device such as a memory, and can control electrically connected devices based on a predetermined control program or the like. In the present embodiment, the controller 36 is a control unit that controls the opening/closing operation of the opening/closing valve (solenoid valve 34) of the valve unit 28, the switching operation of the switching valve 18, and the number of rotations and operating time of the pressurizing pump 22. It is designed to be able to function as

Furthermore, the constant flow rate valve 30 of the valve unit 28 is for throttling down the flow rate of the wash water that has passed through the branch fitting 26 from the stop cock 24 in the main water supply passage 2 to a predetermined flow rate or less.
Incidentally, when the branch fitting 26 is provided with a local sanitary washing device (not shown) for the flush toilet 1, a water supply pipe for supplying washing water to the local sanitary washing device (not shown) is provided. (not shown) can also be connected.
Further, in the valve unit 28, when the electromagnetic valve 34 is opened under the control of the controller 36, the main valve 32 is opened, and the wash water that has passed through the main valve 32 from the constant flow valve 30 flows into the main water supply path. 2 is supplied to the switching valve 18 of the branch portion B on the downstream side of .
Here, the switching valve 18 can supply the washing water of the main water supply passage 2 to both the rim side water supply passage 2a and the tank side water supply passage 2c at the same timing, and the amount of water supply to the rim side and the tank side is can be changed arbitrarily.

Next, the flush water supply device 6 has a tank device T capable of supplying flush water supplied from the main water supply passage 2 to the toilet body 4 . The tank device T includes a water storage tank 20 connected to the rear of the toilet bowl main body 4 and storing flush water supplied from the main water supply passage 2, and a pressurizer for pumping the flush water in the water storage tank 20 to the toilet bowl main body 4. a pump 22;
Further, on the downstream side of the branch portion B on the downstream side of the main water supply passage 2, there are a rim side water supply passage 2a communicating with the rim water passage 46 of the toilet body 4, and a tank side water supply passage 2c connected to the water storage tank 20. are provided respectively.
As a result, the flush water supplied from the main water supply source W0 to the branch portion B of the main water supply passage 2 is at least one of rim water supply to the rim side water supply passage 2a and tank water supply to the tank side water supply passage 2c. It is designed to be used as

The washing water supply device 6 is also provided with a pump water supply passage 2d extending from the downstream side of the tank side water supply passage 2c to the pressure pump 22, and a jet side water supply passage 2b extending downstream from the pressure pump 22. ing.
As a result, in the flush toilet 1 of the present embodiment, the direct-pressure flushing water supplied from the main water supply passage 2 flows from the rim side water supply passage 2a of the flush water supply device 6 to the rim water passage 46 of the toilet body 4. The water is supplied to the rim spout portion 48 via the rim spout portion 48, and water spouting from the rim spout portion 48 (so-called "rim spouting") is possible.
Further, the washing water supplied from the main water supply passage 2 to the washing water supply device 6 passes through the tank side water supply passage 2c of the washing water supply device 6, the water storage tank 20, the pump water supply passage 2d, and the pressurizing pump 22. Water is supplied from the side water supply channel 2b to the jet water outlet 16a through the jet water conduit 16 of the toilet body 4, and water is spouted from the jet water outlet 16a (so-called "jet water spouting").
That is, the flush toilet 1 of the present embodiment performs rim spouting using cleansing water directly pressurized from the main water supply passage 2 and jet spouting using cleansing water pressurized from the water storage tank 20 by the pressurizing pump 22. It functions as a so-called hybrid flush toilet bowl 1 that can be used together.

Next, an upper float switch 38 and a lower float switch 40 are arranged inside the water storage tank 20, respectively. These float switches 38 and 40 allow detection of the water level in the water storage tank 20 .
For example, the upper float switch 38 is turned on when the water level in the water storage tank 20 reaches a predetermined water level, and the controller 36 detects the on state of the upper float switch 38 to close the solenoid valve 34. It has become.
On the other hand, the lower float switch 40 is turned on when the water level in the water storage tank 20 drops to a predetermined water level lower than the predetermined water level detected by the upper float switch 38, and the lower float switch 40 is turned on. The controller 36 detects the state and stops the pressurizing pump 22 .
The pressurizing pump 22 sucks the wash water stored in the water storage tank 20 into the pump water supply passage 2d, and pressurizes the wash water from the pump water supply passage 2d to the jet side water supply passage 2b, thereby increasing the jet water outlet 16a. It is for discharging from.

Due to these structures, during normal toilet flushing, the controller 36 detects the user's operation of a toilet flushing switch (not shown), etc., and sequentially operates the solenoid valve 34, switching valve 18, and pressurizing pump 22. It is designed to let
As a result, the rim water spout 48 and the jet water spout 16a sequentially start spouting, and the wash water that has washed the inside of the bowl portion 8 is discharged from the drain trap conduit 12 together with the dirt inside the bowl portion 8. It has become.
Further, the controller 36 opens the electromagnetic valve 34 after the washing is completed, the switching valve 18 is switched to the side of the tank-side water supply passage 2c, and the washing water in the main water supply passage 2 is supplied to the water storage tank 20. ing.
Then, when the water level in the water storage tank 20 rises and the upper float switch 38 detects a specified amount of stored water, the controller 36 closes the electromagnetic valve 34, causing the main valve 32 to close the main water supply passage 2. Water supply is cut off.
Further, each device of the flush water supply device 6 (functional part) is housed in a rear functional housing part V0 (see FIG. 2) in a region on the rear side of the bowl part 8 of the toilet body 4. ing.

Next, the structure of the bowl portion 8 in the toilet body 4 of the flush toilet 1 according to the present embodiment will be specifically described with reference to FIGS. 1 to 3. FIG.
The rim portion 10 of the bowl portion 8 has straight portions 50 arranged in substantially the same direction so as to be aligned on the right and left sides of the bowl portion 8 when viewed from above, and the bowl portion at the front and rear ends of the straight portions 50 . A circular arc portion 52 connecting straight portions 50 on the right side and the left side of 8 is provided.

The linear portion 50 of the rim portion 10 includes a right linear portion 50a extending linearly in the front-rear direction on the right side of the bowl portion 8 and a left linear portion 50b extending linearly in the front-rear direction on the left side of the bowl portion 8 when viewed from above. Prepare. The right straight portion 50a and the left straight portion 50b are respectively arranged between the connection portion 62 between the front arc portion 52 and the straight portion 50 and the connection portion 62 between the rear arc portion 52 and the straight portion 50. It is The connecting portion 62 forms a curvature change portion that connects the arc-shaped arc portion 52 and the straight line portion 50 . The straight portions 50 extend substantially parallel to each other on the right and left sides of the bowl portion 8 . The straight portions 50 do not have to be formed to have the same length on the right and left sides of the bowl portion 8 . Since the linear portion 50 of the rim portion 10 is formed in a linear shape, washing water on the shelf surface 11 can be prevented from splashing and energy loss due to collision with the linear portion 50 of the rim portion 10.例文帳に追加The washing water can be discharged so as to form a relatively strong flow of washing water in the bowl portion 8. - 特許庁The linear portion 50 is preferably linear, but may be roughly linear even if it is curved to such an extent that washing water does not collide with the linear portion 50 of the rim portion 10 or the like to cause water repelling or the like. .

3, the straight portion 50 of the rim portion 10 extends forward and backward from the rim spout portion 48 and inside the main body of the toilet bowl. It has a front linear portion 50c and a right rear linear portion 50d extending in the front-rear direction on the rear side of the rim spout portion 48 and outside the main body of the toilet bowl. The rim spout portion 48 is provided in a rear region of the toilet body 4 on the rear side of the center of the toilet body 4 (the central transverse line E extending in the left-right direction so as to bisect the bowl portion 8 in the front-rear direction). .

The right front linear portion 50c and the right rear linear portion 50d are arranged side by side. The right front linear portion 50c and the right rear linear portion 50d extend substantially parallel to each other. Since the rim spout portion 48 is formed rearward in the right straight portion 50a, the right front straight portion 50c and the right rear straight portion 50d are formed so as to be aligned stepwise inwardly and outwardly. The right front linear portion 50c and the right rear linear portion 50d are arranged with a shift in the front-rear direction, and even if the right front linear portion 50c and the right rear linear portion 50d are not aligned with the same length. good. The right front linear portion 50c and the right rear linear portion 50d form a right linear portion 50a extending substantially in the front-rear direction. The right front straight portion 50c and the right rear straight portion 50d extend substantially parallel to the left straight portion 50b. In addition, the right front linear portion 50c and the right rear linear portion 50d extend substantially in parallel so as to be aligned with the center section C of the toilet body 4 in the front-rear direction. Further, the right front linear portion 50c and the right rear linear portion 50d extend substantially parallel to line up with the outer portion 56 and the inner portion 60 of the rim water passage 46, which will be described later.

Arc portion 52 is generally defined as a single arc defined by one radius of curvature. The arc portion 52 is formed to protrude forward between the front connecting portion 62 of the right straight portion 50a and the front connecting portion 62 of the left straight portion 50b. Further, the arc portion 52 is formed to protrude rearward between the rear connecting portion 62 of the right straight portion 50a and the rear connecting portion 62 of the left straight portion 50b. Arc portion 52 may be defined as a single arc defined primarily by one radius of curvature, and as another arc defined at both ends by another radius of curvature. In this way, the arc portion 52 may be defined as another arc partly defined by another radius of curvature and formed as a compound arc. Also, the circular arc portion 52 may be defined by a plurality of circular arcs that are defined entirely by a plurality of radii of curvature. Further, only the arc portion on the front side of the arc portion 52 may be defined as a predetermined arc as described above. Note that the length in the front-rear direction from the connecting portion 62 between the straight portion 50 and the arc portion 52 to the front end (or the rear end) of the arc portion 52 (the radius of the arc portion 52) is greater than the length in the front-rear direction of the straight portion 50. , is long formed. By making the radius of the arc portion 52 longer than the length of the straight portion 50, when the washing water flows from the straight portion 50 to the arc portion 52, the change becomes gentle, so that the washing water flows from the straight portion 50 to the arc portion 52. It is possible to suppress the flying dust. In addition, the radius of the arc portion 52 behind the radius of the arc portion 52 (the length in the front-rear direction from the connecting portion 62 between the straight portion 50 and the arc portion 52 on the front side to the front end of the arc portion 52 on the front side) ( The length in the front-rear direction from the connection portion 62 between the straight portion 50 and the rear arc portion 52 to the rear end of the rear arc portion 52) is longer, and is longer in excretion in the standing position or in the sitting position. Since the bowl surface on the rear side is wide, a sense of security during excretion can be increased.

The rim water passage 46 includes an outer portion 56 that extends forward inside the rim portion 10, a bent portion 58 that bends inward from the downstream end of the outer portion 56, and a rim spout portion that extends rearward from the bent portion 58. and an inner portion 60 extending to 48 .

The outer portion 56 extends from the rear region of the toilet body 4 to the front region on the front side of the center of the toilet body 4 (the central transverse line E extending in the left-right direction so as to bisect the bowl portion 8 in the front-rear direction). The outer portion 56 forms a flow path located outside the inner portion 60 . As shown in FIG. 5, an outer portion outer wall 56a and an outer portion inner wall 56b of the outer portion 56 extend substantially parallel so as to line up, and the distance between the both walls is substantially constant. The ceiling surface and the bottom surface of the outer portion 56 are also formed substantially parallel so as to be substantially aligned, and the flow passage cross-sectional area in the outer portion 56 is kept substantially constant in the outer portion 56 . The outer portion 56 forms a channel extending linearly in the front-rear direction. The outer portion 56 includes a bent portion-side straight portion 56 c that connects to the bent portion 58 . The curved portion-side straight portion 56c forms a channel that extends linearly to at least the curved portion 58 . The curved portion-side straight portion 56 c can straighten the flow of the washing water immediately before reaching the curved portion 58 .

The bent portion 58 forms a U-shaped flow path in top view so as to connect the outer portion 56 extending from the rear and the inner portion 60 extending rearward again. Therefore, the bent portion 58 is formed so as to cause the wash water flowing in from the rear to flow out rearward. The bent portion 58 is provided on the rear side of the connecting portion 62 between the straight portion 50 and the arc portion 52 on the front side of the straight portion 50 . Therefore, the bent portion 58 is formed in a U-turn shape within the linearly extending rim portion 10 . Therefore, it is possible to prevent the U-turn shape of the bent portion 58 from being distorted in the curved rim portion 10 and increasing the pressure loss. The bent portion 58 is located in the front region on the front side of the central transverse line E of the toilet body 4 .

As shown in FIG. 4, the bent portion 58 has a top portion 68 farthest from an intermediate portion 66 provided between the inner portion 60 and the outer portion 56 in a top view in the direction in which the intermediate portion 66 extends. The top portion 68 forms the top portion that protrudes most in the direction in which the intermediate portion 66 extends. The top portion 68 is formed closer to the outer portion 56 than the imaginary center line F extending along the center of the intermediate portion 66 . The top portion 68 is formed outside the intermediate portion 66 . The top portion 68 is formed in an arc shape when viewed from above. The top portion 68 is formed on a wall surface facing the intermediate portion 66 when viewed from above. An end portion 66a of the intermediate portion 66 on the bent portion 58 side is also formed in an arc shape when viewed from above. The curvature radius of the end portion 66 a of the intermediate portion 66 on the bent portion 58 side is smaller than the curvature radius of the top portion 68 . As a result, the wash water bent at the top portion 68 flows back from the top portion 68 toward the end portion 66a of the intermediate portion 66 as indicated by arrow F1, and flows toward the inner portion 60 side of the intermediate portion 66 as indicated by arrow F2. By separating from the surface 66b of the intermediate portion 66, it further suppresses pressure loss, weakening of the water force and turbulence of the flow, and flows along the surface 66b on the inner side of the intermediate portion 66 as shown by the arrow F3. be able to.

The outer portion 56 of the rim water passage 46 is formed to extend further forward than the intermediate portion 66 , and the outer portion 56 is formed to extend further forward than the inner portion 60 . An outer partial outer wall 56 a of the outer portion 56 forms a linear wall surface extending forward from the end portion 66 a of the intermediate portion 66 to form the outer portion 56 . On the other hand, the inner inner wall 60b of the inner portion 60 forms a linear wall surface to the vicinity of the end portion 66a of the intermediate portion 66. As shown in FIG. In this way, the outer portion 56 once extends to the front side of the intermediate portion 66 and then the bent portion 58 is formed, so that the flow returning from the top portion 68 toward the end portion 66 a of the intermediate portion 66 is reduced to the intermediate portion 66 . The angle formed with the inner side surface 66b of the portion 66 is a relatively small acute angle, so that it is difficult to separate from the inner side surface 66b. In addition, compared to the case where the outer portion 56 is not formed to extend further forward than the intermediate portion 66, the outer portion 56 once extends further forward than the intermediate portion 66 and then bends. A relatively large cross-sectional area can be easily formed. As a result, when the width of the flow path is widened from the outer portion 56 to the inner portion 60 and the cross-sectional area of the flow path is increased, the cross-sectional area of the flow path from the outer portion 56 to the bent portion 58 is increased. The change can be suppressed, and the change in the flow passage cross-sectional area from the bent portion 58 to the inner portion 60 in the bent portion 58 can be suppressed. Therefore, a change in the cross-sectional area of the flow path from the outer portion 56 to the inner portion 60 via the bent portion 58 can be suppressed. For example, the change between the channel cross-sectional area of the outer portion 56 as shown in FIG. 5 and the channel cross-sectional area of the bent portion 58 as shown in FIG. 6 is relatively small. There is a relatively small change between the channel cross-sectional area of the bent portion 58 as shown and the channel cross-sectional area of the bent portion 58 as shown in FIG. In this way, the change in flow passage cross-sectional area from the outer portion 56 to the bent portion 58 is relatively small.

The inner portion 60 extends from the front area of the toilet body 4 to the rear area behind the central transverse line E of the toilet body 4 . The inner portion 60 extends to near the center of the toilet body 4 . An inner outer wall 60a and an inner inner wall 60b of the inner portion 60 extend substantially in parallel so as to be lined up, and the interval between the both walls is substantially constant. The ceiling surface and the bottom surface of the inner part 60 are also formed substantially parallel so as to be substantially aligned, and the cross-sectional area of the flow path in the inner part 60 is kept substantially constant in the inner part 60 . A lateral width W1 of the inner portion 60 when viewed from the top is larger than a lateral width W2 of the outer portion 56 when viewed from the top. The inner portion 60 forms a channel extending linearly in the front-rear direction. The inner portion 60 includes a spouting portion-side straight portion 60 c that connects to the rim spout portion 48 . The water discharge portion-side straight portion 60 c forms a flow path extending linearly at least to the rim water discharge port portion 48 . The water discharge portion-side straight portion 60c can straighten the flow of cleansing water just before reaching the rim water discharge port portion 48 in a straight line. The inner portion 60 is formed with a length within the range of 40 mm to 60 mm, for example. In addition, the inner portion 60 may extend so as to terminate at a front region on the front side of the central transverse line E.

A single rim water discharge port 48 is formed on the inner peripheral surface of the rim portion 10 as a single rim water discharge portion, and is formed in the straight portion 50 so as to discharge water toward the rear of the bowl portion in the direction in which the straight portion 50 extends. be done. The rim spout portion 48 forms an opening in the rearward end portion of the inner portion 60 . The opening direction of the rim water discharge port portion 48 is substantially the same as the direction in which the flow path of the water discharge portion side straight portion 60c of the inner portion 60 extends. The right rear linear portion 50d is positioned on the same straight line rearward of the inner outer wall 60a of the inner portion 60 and is connected to the inner outer wall 60a substantially flush. Therefore, when the wash water flows out from the rim spout portion 48, it can flow out linearly from the inner outer wall 60a along the right rear straight portion 50d. The right rear straight portion 50 d extends substantially parallel to the inner inner wall 60 b of the inner portion 60 . Therefore, it is possible to suppress disturbance of cleansing water discharged in a straight line. The right rear linear portion 50d is formed with a length within a range of 100 mm to 120 mm, for example.

The bowl portion 8 further includes a rim spout water passage 64 extending from the rim spout portion 48 on the rear side of the rim spout portion 48 in the direction in which the straight portion 50, for example, the right rear straight portion 50d extends. As shown in FIG. 1 , the ceiling surface 64 a of the rim water discharge section water passage 64 is formed in an overhang shape from the inside to the outside of the bowl portion 8 , and the rim water discharge section water passage 64 is an opening inside the bowl portion 8 . It is formed as a U-shaped notch-shaped passage so as to cut out in a U-shape from the portion toward the outer wall surface. Since the rim water discharge passage 64 on the downstream side of the rim water discharge port 48 is formed in an overhang shape, splashing of the discharged wash water is suppressed and the wash water flows to the shelf surface 11. . In other words, on the downstream side of the rim water discharge port 48, a rim water discharge channel 64 is provided at the same height as the shelf surface 11 and surrounded by an overhang.
The length of the left straight portion 50b in which the rim spout portion 48 is not provided (the length of the left straight portion 50b between the front and rear connecting portions 62) A connection portion 62 with the arc portion 52 is provided in a rim water spouting portion water passage 64 formed in an overhang shape. When viewed from above, the connecting portion 62 between the right rear straight portion 50d and the arc portion 52 and the connecting portion 62 between the left straight portion 50b and the arc portion 52 are formed substantially symmetrically in the left-right direction across the central cross section C. However, the connection portion 62 between the right rear straight portion 50d and the arc portion 52 is arranged forward of the connection portion 62 between the right rear straight portion 50a and the arc portion 52. As shown in FIG. Therefore, the powerful wash water immediately after being discharged from the rim water discharge section 48 collides with the curvature change portion of the connecting portion 62 in the overhang-shaped rim water discharge section water passage 64, and splashes out of the bowl section 8. can be suppressed. Further, the arc portion formed in the rim water discharge section water passage 64 has a gentler radius of curvature than the rear arc portion 52, and the arc portion in the rim water discharge portion water passage 64 extends from the right rear straight portion 50d. Since the cleansing water is swirled to the arcuate portion 52 on the rear side via it, it is possible to swirl the cleansing water while reducing energy loss and water splashing.

Next, the structure and the like of the shelf surface 11 of the bowl portion 8 will be described in detail with reference to FIGS. 8 and 9. FIG. FIG. 8 is a plan view showing the bowl and shelf of the flush toilet according to the embodiment of the present invention, and FIG. 9 is for explaining the flow of flush water in the shelf of the flush toilet according to the embodiment of the present invention. It is a schematic plan view of a shelf.

First, as shown in FIG. 8, the shelf surface 11 of the bowl portion 8 is composed of a right straight portion 40a and a left straight portion 40b extending in parallel on the right and left sides of the bowl portion 8, and these right and left straight portions. It is formed by a front arcuate portion 42 connected to the front ends of the portions 40a and 40b, and a rear arcuate portion 44 connected to the rear ends of the right straight portion 40a and the left straight portion 40b.
Specifically, the front end of the right straight portion 40a and the front arc portion 42 are connected by a connecting portion 46a, and the rear end of the right straight portion 40a and the rear arc portion 44 are connected by a connecting portion 46b. The rear end of the left straight portion 40b is connected by a connecting portion 46c, and the front end of the left straight portion 40b is connected to the front arc portion 42 by a connecting portion 46d.

Here, both the front arcuate portion 42 and the rear arcuate portion 44 are formed with a single radius of curvature R1.
The front arc portion 42 and the rear arc portion 44 may be formed by combining a plurality of curvature radii.

More specifically, as shown in FIG. 8 , the shelf surface 11 of the bowl portion 8 is substantially left and right with respect to a center line C1 (central cross section C) extending in the front-rear direction on each of the front and rear sides. The shape is symmetrical, and the shape is substantially symmetrical front to back with respect to a substantially central line C2 extending in the left and right width directions. The front arc portion 42 has a semicircular shape with a single radius R1 and a center O1. Similarly, the rear arc portion 44 has a semicircular shape with a single radius R2 and a center O2. ing.

8, position A is the front end of the bowl portion 8, position B is the intermediate position between the front end of the bowl portion 8 and the front end of the right straight portion 40a, and position C is the front end of the right straight portion 40a. , the position D is the middle position of the right straight portion 40a, the position D1 is the position of the rim spout portion 48, and the positions D and D1 are almost the same. Position E is the rear end of the right straight portion 40a, Position F is the intermediate position between the rear end of the right straight portion 40a and the rear end of the bowl portion 8, Position G is the rear end of the bowl portion 8, and Position F is the rear end of the bowl portion 8. H is the intermediate position between the rear end of the bowl portion 8 and the rear end of the left straight portion 40b, position I is the rear end of the left straight portion 40b, position J is the intermediate position of the left straight portion 40b, and position K is the front end of the left straight portion 40b, and L is an intermediate position between the front end of the left straight portion 40b and the front end of the bowl portion 8. As shown in FIG. Therefore, the line connecting the positions D and J forms the approximate center line C2, and the line connecting the positions A and G forms the center line C1. Further, the length in the front-rear direction from the approximate center line C2 to the position G is longer than the length in the front-rear direction from the approximate center line C2 to the position A. Therefore, when excreting in a standing position or in a sitting position, the bowl surface on the rear side is wide, so that a sense of security during excretion can be increased. The length in the front-back direction from position C to position E and the length in the front-back direction from position I to position K are substantially constant. Therefore, the length in the front-rear direction from position E to position G is formed long. Also, the length in the front-rear direction from position C to position A is longer than the length in the front-rear direction from position C(I) to position E(K). In other words, the radii R1 and R2 of the front arc portion 42 and the rear arc portion 42 are longer than the length of the right (left) straight portion. If the straight portion on the right (left) side is longer than the radii R1 and R2, the radii R1 and R2 will be relatively short, and the change will be abrupt when the wash water flows from the straight portion to the arc portion. may scatter. On the other hand, by making the radii R1 and R2 of the front arcuate portion 42 and the rear arcuate portion 42 longer than the length of the right (left) side straight portion, the change is gentle when the washing water flows from the straight portion to the arc portion. As a result, it is possible to suppress splashing of cleaning water.

Next, the behavior of washing water flowing on the shelf surface 11 of the bowl portion 8 will be described with reference to FIG. As shown in FIG. 9, the flow of cleansing water flowing from the right straight portion 40a to the rear arc portion 44 is F11, the flow of cleansing water flowing from the rear arc portion 44 to the left straight portion 40b is F12, and the flow from the left straight portion 40b is F11. The flow of cleansing water flowing to the front arc portion 42 is F13, and the flow of cleansing water flowing from the front arc portion 42 to the right edge portion 40a is F14.

Here, the washing water flowing through the right straight portion 40a and the left straight portion 40b of the shelf surface 11 does not easily flow down to the dirt receiving surface 8 because the flow path resistance is small, while it flows through the front arc portion 42 and the rear arc portion 44. Since the direction of flow of the washing water changes and the flow is turbulent, the turbulence of the flow makes it easier for the washing water to flow down onto the dirt receiving surface 8 . The influence of flow turbulence is greater than the influence of centrifugal force.
Therefore, in the flows F12 and F14 of the washing water flowing from the arc portion to the straight portion, it is difficult for the washing water to flow down from the shelf surface 11. On the other hand, in the flows F11 and F13 of washing water flowing from the straight portion to the arc portion, Water can easily flow down from the shelf surface 11 . Due to such behavior of the washing water, unwashed portions are likely to occur on the dirt receiving surface in the regions X1 and X2 where the washing water flows from the arc portion to the straight portion.

Here, in the rear region (including the region X2) of the bowl portion 8, the rim spout portion 48 discharges water backward, and is provided at the position D1. Since the cleaning water is close, the force of the cleaning water is strong and the turbulence is large. On the other hand, in the front region of the bowl portion 8 (including the region X1), since the force of the cleansing water is small and there is little turbulence, the cleansing water is less likely to flow down from the front arcuate portion 42, and therefore an unwashed portion is likely to occur. In this embodiment, an inclined surface (rising surface) 49 that ascends toward the rim spout portion 48 is formed on the shelf surface 11 located in the region X1 in FIG. It is Since the rising surface 49 is formed on the shelf surface 11 in this way, the flow velocity of the washing water is reduced, and as a result, the shelf surface 11 in the area of the rim spout portion 48 (or the central position D of the right straight portion 40a) is lowered. It is possible to suppress the occurrence of an unwashed portion on the filth receiving surface 8 located below.

Next, with reference to FIGS. 3 and 4, the operation (action) of the wash water in the rim water passage 46 according to one embodiment of the present invention will be described.
The wash water supplied from the rim-side water supply channel 2 a to the rim water channel 46 flows forward in the outer portion 56 of the rim water channel 46 . Since the outer portion 56 extends linearly toward the front side, the wash water is rectified along the outer portion 56 and flows linearly. Washing water hitting the top portion 68 of the curved portion 58 located in front of the outer portion 56 bends relatively smoothly along the top portion 68 and is folded back toward the intermediate portion 66 . At this time, the angle α formed by the flow returning from the top portion 68 toward the end portion 66a of the intermediate portion 66 as indicated by the arrow F1 with respect to the surface 66b on the inner side of the intermediate portion 66 tends to be acute. A flow as shown in (1) can easily flow along the surface 66b. Therefore, it is possible to suppress separation of the wash water as indicated by the arrow F2 on the inner portion 60 side of the intermediate portion 66, making it easier to form a flow along the surface 66b as indicated by the arrow F3. This facilitates the formation of a relatively strong and straightened flow within the inner portion 60 and further downstream.
If the apex 68 of such a bent portion 58 is not formed at a predetermined position, it is difficult to form a flow that bends along the apex 68 and turns back toward the intermediate portion 66, or the washing water flows. When going around the end portion 66 a of the intermediate portion 66 , a flow that separates from the surface 66 b of the intermediate portion 66 on the inner portion 60 side is likely to be formed. Water flow becomes turbulent. In this embodiment, by forming the apex 68 at a predetermined position and shape in the bent portion 58, such turbulence of the wash water can be reduced, and a desired advantageous effect can be obtained.

Next, the operation of the flush toilet 1 according to the embodiment of the present invention described above will be described.
First, according to the flush toilet 1 according to one embodiment of the present invention, the rim water spouting portion 14 forms the rim water spouting portion 48 at the downstream end of the rim water passage 46 for spouting flush water backward. The water passage 46 includes an outer portion 56 that extends forward inside the rim portion 10 , a bent portion 58 that bends inward from the downstream end of the outer portion 56 , and a rim spout portion 48 that extends rearward from the bent portion 58 . and an inner portion 60 extending to. In such a rim water passage 46 that bends from the front to the rear, the bent portion 58 extends from an intermediate portion 66 provided between the inner portion 60 and the outer portion 56 in a top view. , the top portion 68 is formed on the side of the outer portion 56 with respect to an imaginary centerline F extending along the center of the intermediate portion 66 . As a result, when the wash water is bent relatively sharply from the forward direction to the rearward direction within the rim portion 10, the bent flow separates from the surface of the intermediate portion 66 on the inner portion 60 side, thereby causing pressure loss. It is possible to suppress the weakening of the water force and the generation of turbulence of the flow, suppress the weakening of the water force of the flow spouted from the rim spout part 48 into the bowl part 8, and spout the rectified flow. Therefore, it is possible to improve the washing performance of the bowl portion 8 when the washing water passing through the rim water passage 46 curved from the front to the rear is discharged from the rim water discharge portion 14 to the rear of the bowl portion.

Next, according to the flush toilet 1 according to the embodiment of the present invention, since the top portion 68 is formed in an arc shape when viewed from above, the flush water can be bent relatively smoothly along the top portion 68. , weakening of the water force and turbulence of the flow caused by pressure loss at the top portion 68 can be further suppressed, and weakening of the water force of the flow discharged from the rim spout portion 48 into the bowl portion 8 can be further suppressed. Together, it can deliver a more rectified flow. Therefore, it is possible to further improve the washing performance of the bowl part 8 when the washing water passing through the rim water passage 46 curved from the front to the rear is discharged from the rim water discharge part 14 to the rear of the bowl part 8. - 特許庁

Further, according to the flush toilet 1 according to the embodiment of the present invention, the radius of curvature of the end portion of the intermediate portion 66 on the side of the bent portion 58 is smaller than the radius of curvature of the top portion 68 , so that the curved washing surface at the top portion 68 can be flushed. When water flows from the end of the intermediate portion 66 toward the inner portion 60 side, the flow returning from the top portion 68 toward the end portion of the intermediate portion 66 separates from the surface of the intermediate portion 66 on the inner portion 60 side, resulting in pressure loss. This further suppresses weakening of the water force and generation of turbulence in the flow, making it easier for the wash water to flow along the surface of the intermediate portion 66 on the inner portion 60 side, and to flow from the rim spout portion 48 into the bowl portion 8. It is possible to further suppress the weakening of the water force of the flow to be discharged, and to discharge a further rectified flow. Therefore, it is possible to further improve the washing performance of the bowl part 8 when washing water passing through the rim water passage 46 curved from the front to the rear is discharged from the rim water discharge part 14 to the rear of the bowl part 8. - 特許庁

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the outer portion 56 of the rim water passage 46 is formed to extend further forward than the intermediate portion 66, and the outer portion 56 Since it is formed to extend further forward than 60, the flow passage cross-sectional area of bent portion 58 is relatively large compared to the case where outer portion 56 is not formed to extend further forward than intermediate portion 66. It can be easily formed, and a change in the cross-sectional area of the flow path from the outer portion 56 to the inner portion 60 via the bent portion 58 can be suppressed. Therefore, when the flow reaches the inner portion 60 from the outer portion 56 through the curved portion 58, the pressure loss is further suppressed, and the flow is further prevented from weakening or turbulent flow. It is possible to further suppress the weakening of the water force of the flow discharged into the inside 8, and to discharge a further rectified flow.

Furthermore, according to the flush toilet 1 according to one embodiment of the present invention, the outer portion 56 of the rim water passage 46 includes the bent portion side straight portion 56c connected to the bent portion 58, and the inner portion 60 of the rim water passage 46 is provided with a water discharge portion side straight portion 60 c connected to the rim water discharge port portion 48 . As a result, compared to the case where the outer portion 56 and the inner portion 60 are formed by curved portions, the flow passing through the outer portion 56 and the inner portion 60 causes a pressure loss, weakening the water force and turbulence of the flow. It is possible to further suppress the weakening of the flow of water spouted from the rim spout portion 48 into the bowl portion 8, and to spout a further rectified flow.

Furthermore, according to the flush toilet 1 according to the embodiment of the present invention, the width of the inner portion 60 when viewed from the top is larger than the width of the outer portion 56 when viewed from the top. When flowing into the inner part 60 through the , the wash water can easily flow smoothly from the outer part 56 to the inner part 60 having a larger width, causing pressure loss, weakening the water force, and causing turbulence in the flow. This further suppresses the flow of water spouted into the bowl portion 8 from the rim spout portion 48, thereby further suppressing the weakening of the water force and spouting a more rectified flow.

1 Flush toilet bowl 8 Bowl portion 9 Waste receiving surface 10 Rim portion 12d Top portion 14 Rim water discharge portion 46 Rim water passage 48 Rim water discharge port portion 50 Straight portion 56 Outer portion 56c Bending portion side straight portion 58 Bending portion 60 Inner portion 60c Water discharge portion Side straight portion 66 Intermediate portion 66a End portion 66b Surface 68 Top portion W1 Width W2 Width

Claims (3)

A flush toilet that is flushed with flush water supplied from a flush water source to discharge waste,
a bowl-shaped dirt receiving surface;
a bowl portion comprising: a rim portion formed at the upper edge of the waste receiving surface;
a drainage channel connected to the lower part of the bowl portion for discharging waste;
a rim water spouting portion for spouting wash water supplied from the wash water source into the bowl portion to form a swirl flow in the bowl portion;
The rim water discharge portion is provided in the rim portion on either the left or right side of the bowl portion, forms a rim water passage through which supplied washing water flows, and is located at the downstream end of the rim water passage. Forming a rim spout that spouts cleansing water backward,
The above rim waterway is
an outer portion extending forward in the interior of the rim;
a bent portion that bends inward from the downstream end of the outer portion;
an inner portion extending rearwardly from the bent portion to the rim spout ;
The bent portion is a top portion farthest from an intermediate portion provided between the inner portion and the outer portion in a top view in a direction in which the intermediate portion extends, and the top portion is at the center of the intermediate portion. The apex is formed on the outer side of the virtual center line extending along ,
The outer portion of the rim water passage is formed to extend further forward than the intermediate portion, and the outer portion is formed to extend further forward than the inner portion. Flush toilet bowl. The outer portion of the rim water passage includes a bent portion-side straight portion that connects to the bent portion, and the inner portion of the rim water passage includes a water discharge portion-side straight portion that connects to the rim water discharge port. The flush toilet bowl according to claim 1 . The flush toilet according to claim 1 or 2 , wherein the width of the inner portion when viewed from the top is larger than the width of the outer portion when viewed from the top.

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