JP2023034494A - Flush toilet bowl - Google Patents

Abstract

To provide a flush toilet bowl capable of improving quietness of rim water discharge and washing performance of a bowl part by the rim water discharge.SOLUTION: A flush toilet bowl of the present invention comprises: a rim water discharge port part 48 that discharges washing water from a rim part into a bowl part; a rim water passage 46 that extends to the rim water discharge port part within the rim part; and a guide part 50 that is provided in the rim water passage, wherein the guide part is provided at a position facing an inlet part of the rim water passage and is formed to protrude upward from a bottom surface of the rim water passage, and the guide part comprises: a side wall 52 that rises from the bottom surface and forms a side flow channel 53 that passes along the side of the guide part in the rim part; and a downward slope part 54 that slopes downward from an upper part of the guide part toward a downstream side of the rim water passage.SELECTED DRAWING: Figure 4

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 Documents 1 to 4, in a flush toilet, a rim water passage is formed inside a rim portion, and washing is conducted to a rim spout on the downstream side of the rim water passage. A device in which water is spouted backward is known.

Here, in Patent Document 1, it is disclosed that the flow velocity of the wash water is increased by a constricted portion formed in the upstream water channel of the rim water channel, and the air accumulated downstream of the constricted portion is agitated. there is Further, Patent Document 2 discloses that a guide wall formed in the rim water passage reduces the space for air other than cleansing water, thereby reducing the volumetric space of the entire rim water passage. Patent Document 3 discloses that a stepped portion is formed in the upper portion of the guide wall portion in the rim water conduit, and the wash water forms a turbulent flow that rotates even in the upper space above the stepped portion. ing.

JP 2019-272114 A JP 2019-27138 A JP 2019-49118 A

As described above, in the flush toilets as described in Patent Documents 1 to 3 above, the upper air in the rim water passage is agitated in order to suppress the generation of abnormal noise due to the flush water air when the rim water is spouted. Therefore, it has been considered to pass the washing water through the guide wall or the like in the rim water passage.
However, when the cleansing water is passed through the guide walls and the like in the rim water passage, the pressure loss of the cleansing water becomes relatively large, and the flow rate of the cleansing water spouted from the rim spout decreases. There was a problem that the detergency of the part decreased.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-described problems of the prior art, and it is an object of the present invention to provide a flush toilet capable of improving the quietness of the rim spout and the washing performance of the bowl portion by the rim spout. there is

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 formed on the upper edge of a receiving surface; a rim spout for spouting cleansing water from the rim into the bowl; and a rim spout extending within the rim to the rim spout. A rim water channel and a guide portion provided in the rim water channel, wherein the guide portion is provided at a position facing an inlet portion of the rim water channel and protrudes upward from the bottom surface of the rim water channel. and the guide portion includes a side wall formed to rise from the bottom surface and forming a lateral flow path passing laterally of the guide portion in the rim portion, and an upper portion of the guide portion. and a downwardly sloping portion that slopes downward from the rim water passage toward the downstream side of the rim water passage.
In one embodiment of the present invention configured as described above, the guide portion is formed so as to rise from the bottom surface and forms a flow path passing through the side of the guide portion in the rim portion; a descending slope portion that slopes downward from an upper portion of the guide portion toward a downstream side of the rim water passage. As a result, part of the wash water is guided upward in the rim water passage by the guide, and the air in the upper part of the rim water passage is easily discharged to the downstream side together with the wash water, and the washing rises to the upper part of the guide. Water is guided downward by the downward sloping portion, and the pressure loss of the wash water passing over the guide portion can be suppressed, and the flow velocity of the wash water guided by the downward sloping portion is made difficult to drop, and the water is passed along the side of the guide portion. It can smoothly merge with washing water from the flow path. Therefore, it is possible to reduce the noise caused by relatively large masses of air being discharged when the cleansing water passes through the rim water passage, and to make it difficult for the flow velocity of the rim spout water to drop. Therefore, it is possible to improve the quietness of the rim spout of the flush toilet and the washing performance of the bowl portion by the rim spout.

In the present invention, preferably, the downward slope portion is formed so that its width becomes narrower toward the downstream side of the rim water passage.
In one embodiment of the present invention configured as described above, the downward slope portion is formed so that the width becomes narrower toward the downstream side of the rim water passage. increases the flow velocity of the wash water when it is guided downward by the downward sloping portion, so that it can smoothly merge with the wash water from the side flow passage that passes along the side of the guide portion, and it is easy to guide the flow of wash water after merging. can.

In the present invention, preferably, the downward slope portion extends to the bottom surface side region of the rim water passage.
In one embodiment of the present invention configured as described above, the downward slope portion extends to the bottom surface side region of the rim water passage. As a result, the wash water that has passed over the guide can be guided to the bottom surface side area by the downward slope, and the pressure loss of the wash water that has passed over the guide can be further suppressed, and the side flow path that passes along the side of the guide. It can smoothly merge with wash water from the

In the present invention, preferably, the downward slope portion includes a first slope portion extending from an upper portion of the guide portion and a second slope portion extending from the first slope portion and further sloped downward from the first slope portion. and
In one embodiment of the present invention configured as described above, the downward slope portion includes a first slope portion extending from an upper portion of the guide portion, and a downward slope extending from the first slope portion and further downward than the first slope portion. and a second inclined portion that inclines to As a result, part of the washing water flowing down along the first inclined portion can flow from the first inclined portion to the space on the downstream side. It is possible to make it easier for the flow from the flow path passing through to flow in. Therefore, the flow of cleansing water from the first inclined portion and the flow of cleansing water from the channel passing along the side of the guide portion can be more easily merged.

In the present invention, preferably, the guide portion further includes an upwardly inclined portion provided at a position facing the inlet portion and inclined upward from the bottom surface toward the downstream side of the rim water passage.
In one embodiment of the present invention configured as described above, the upwardly inclined portion of the guide portion facilitates the upward movement of the wash water flowing in from the inlet portion to the upper portion of the guide portion, thereby removing the air in the upper portion of the rim water passage. Relatively fine lumps can be easily pulled downstream together with the cleansing water, and the pressure loss of the cleansing water rising to the upper part of the guide portion can be suppressed.

In the present invention, preferably, the downward slope portion of the guide portion is longer than the upward slope portion in top view.
In one embodiment of the present invention configured as described above, the downward slope portion of the guide portion is longer than the upward slope portion in top view. As a result, the turbulence of the wash water guided by the upward slope can be suppressed, and the flow in the direction along the downward slope can be easily formed while making it difficult to reduce the flow velocity of the wash water guided by the downward slope. It is possible to more smoothly merge with the wash water from the flow path passing along the side of the part.

In the present invention, preferably, the guide portion further includes a flat portion formed thereon.
In one embodiment of the present invention configured as described above, the guide portion further includes a flat portion formed on the upper portion thereof, so that the wash water that has risen to the upper portion of the guide portion flows along the flat portion. This makes it easier to flow, suppresses separation of the cleansing water from the upper portion, and suppresses pressure loss caused by turbulent flow of the cleansing water.

In the present invention, preferably, the downward slope portion of the guide portion is formed to have a gentler slope than the upward slope portion in a side view.
In one embodiment of the present invention configured as described above, the downward slope portion of the guide portion is formed to have a gentler slope than the upward slope portion in a side view. As a result, the cleansing water is raised by the relatively steep upward slope in a relatively short period of time to suppress disturbance of the cleansing water guided by the upward slope, and the flow velocity of the cleansing water guided by the downward slope is reduced. The wash water flows along the downward slope for a relatively long period of time while making it difficult for the washing water to flow in the direction along the downward slope. It is easy to join smoothly.

According to the flush toilet bowl of the present invention, it is possible to improve the quietness of the rim spout and the washing performance of the bowl portion by the rim spout.

1 is an overall configuration diagram of a flush toilet according to a first embodiment of the present invention; FIG. 1 is a plan view of a flush toilet according to a first embodiment of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line III-III of FIG. 1; Fig. 2 is a schematic perspective view showing the inside of the rim water passage and the guide portion with the upper portion of the rim portion of the flush toilet bowl according to the first embodiment of the present invention omitted; FIG. 3 is a top view showing the inside of the rim water passage and the guide portion viewed from above with the upper portion of the rim portion of the flush toilet bowl according to the first embodiment of the present invention omitted; FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 5; Result of numerical analysis by computer simulation of the distribution of cleansing water and air in the rim channel of the flush toilet according to the first embodiment of the present invention when cleansing water is supplied from the inlet into the rim channel. It is a figure which shows an example. FIG. 10 is a schematic perspective view showing the inside of the rim water passage and the guide portion with the upper portion of the rim portion of the flush toilet bowl according to the second embodiment of the present invention omitted; FIG. 3 is a cross-sectional view showing a cross section along a line similar to the line III-III in FIG. 1 in the flush toilet according to the second embodiment of the present invention; FIG. 10 is a top view showing the inside of the rim water passage and the guide portion viewed from above with the upper portion of the rim portion of the flush toilet bowl according to the second embodiment of the present invention omitted; FIG. 11 is a cross-sectional view along line XI-XI of FIG. 10;

Next, a flush toilet according to a first 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 a first embodiment of the present invention. 2 is a plan view of the flush toilet according to the first 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 the first 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 flush water supply device 6. The flush toilet 1 is washed with wash water supplied from the main water supply source W0 to discharge waste.
In the following description of the first embodiment of the present invention, the view 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 front side is defined as the front side, the rear 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 and a drain trap line 12 extending from the bottom of the bowl portion 8 .
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.

Next, as shown in FIGS. 2 and 3, the flush toilet 1 is further configured to extend either the left or right side of the bowl portion 8 so that flush water supplied from the flush water source is passed through the bowl portion 8. a rim water passage 46 formed in the rim portion 10 on the side of the rim; and a guide portion 50 which is provided at the end and guides the flow of washing water. The rim water passage 46 and the rim spout portion 48 are formed to spout wash water supplied from the wash water source into the bowl portion 8 to form a swirling flow inside the bowl portion 8 .

The rim spout portion 48 spouts cleansing water from the rim portion 10 into the bowl portion 8 . The rim spout portion 48 is provided at the outlet of the rim water passage 46 within 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 viewed from the front side of the toilet body 4). ing. The rim spout portion 48 forms a rim conduit for the opening of the rim portion 10 . The rim spout portion 48 is made of pottery, but may be made of other materials such as resin. 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). . Only one rim spout portion 48 is formed on the inner peripheral surface of the rim portion 10 as a single rim spout portion, and is formed to spout water rearward of the bowl portion. The opening direction of the rim spout portion 48 is substantially the same as the direction in which the inner portion 60 extends.

The bowl portion 8 further includes a rim spout water passage 68 extending rearward from the rim spout portion 48 on the rear side of the rim spout portion 48 . The rim water discharge section water passage 68 is formed in an overhang shape from the inside to the outside of the bowl section 8 .

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 ascending 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 line 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 this 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, the number of rotations of the pressurizing pump 22, the operating time, and the like. 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 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 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 state is detected by the controller 36 and the pressure pump 22 is stopped.
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 tank side water supply passage 2c side, 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 rim water passage 46 in this embodiment will be specifically described with reference to FIGS. 1 to 4. FIG.
The rim water passage 46 is provided in 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). The rim water passage 46 forms a rim water passage extending from an inlet portion 46 a located in the rear region of the bowl portion 8 to a rim spout portion 48 . The rim water passage 46 has a so-called U-turn shape in which it extends forward from the rear side of the toilet body 4 and then bends toward the rear side along the way. Furthermore, a rim-side water supply channel 2a of the washing water supply device 6, which will be described later in detail, is connected to an inlet portion 46a of the rim water channel 46. As shown in FIG. 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 as rim spout water. The rim water passage 46 is made of pottery, but may be made of other materials such as resin.

The rim water passage 46 includes an outer portion 56 that extends forward through the interior of the rim portion 10 from an inlet portion 56d, a bent portion 58 that bends inward from the downstream end of the outer portion 56, and a bent portion 58 that extends rearward. and an inner portion 60 extending to the rim spout portion 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 central transverse line E of the toilet body 4 . The outer portion 56 forms a flow path located outside the inner portion 60 . A guide portion 50 is provided within the outer portion 56 . An outer wall 46 e of the rim water passage 46 forms an outer wall surface of the outer portion 56 .

The bent portion 58 forms a turn-back flow path that turns back within the limited space in the rim portion on one side of the toilet body 4 . The bent portion 58 forms a U-shaped flow path that is bent approximately 180 degrees in a top view so as to connect the outer portion 56 and the inner portion 60 . A bent portion 58 is formed in the linearly extending rim portion 10 . 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. 3 , the inner portion 60 extends from the front region of the toilet body 4 to the rear region behind the central transverse line E of the toilet body 4 . The inner portion 60 can straighten the flow of cleansing water immediately before reaching the rim spout portion 48 .

Next, referring to FIGS. 3 to 6, the structure of the guide portion 50 in this embodiment will be specifically described.
The guide portion 50 is formed to guide part of the flow of wash water to the upper space above the rim water passage 46 . The guide portion 50 is provided at a position facing the inlet portion 46 a of the rim water passage 46 and is formed to protrude upward from the bottom surface 46 b of the rim water passage 46 .

The guide portion 50 further includes a side wall 52 that rises from the bottom surface 46 b and forms a side flow path 53 that passes through the side of the guide portion 50 in the rim portion 10 , and a rim passage from the upper portion of the guide portion 50 . A downward slope portion 54 that slopes downward toward the downstream side of the water channel 46, and an upward slope portion 72 that is provided at a position facing the inlet portion 46a and slopes upward from the bottom surface 46b toward the downstream side of the rim water channel 46. and a flat portion 74 formed thereon.

As shown in FIG. 3 , the side wall 52 defines a lateral flow path 53 inside the bowl portion 8 from the guide portion 50 between the side wall 52 and the inner vertical wall 46 d of the rim water passage 46 . The side flow path 53 extends along the inside of the toilet bowl of the guide portion 50 . The side flow path 53 extends from the upstream inner end of the guide portion 50 toward the downstream end of the downward slope portion 54 . The side flow path 53 has a substantially flat bottom surface from the upstream side to the downstream side, and can easily form a relatively fast and rectified flow in the rim water passage 46 .

As shown in FIG. 4 , the downward slope portion 54 is formed so that its width becomes narrower toward the downstream side of the rim water passage 46 . For example, when viewed from above, the descending slope portion 54 is formed in a substantially triangular shape, and is formed such that the width in the left-right direction gradually narrows toward the downstream side of the rim water passage 46 .

The downward slope portion 54 extends to the bottom side region 70 of the rim water passage 46 at its lower end. The bottom surface side region 70 is, for example, a region below half of the height of the rim water passage 46 on the side of the bottom surface 46b, and is a region in the vicinity of the bottom surface 46b. The bottom surface side region 70 may be defined by other methods such as a region closer to the bottom surface 46 b than half of the height of the guide portion 50 .

The downward slope portion 54 is formed so as to gradually become lower in the height direction toward the downstream side of the rim water passage 46 . The downward slope portion 54 includes a first slope portion 54a extending from the upper portion of the guide portion 50, and a second slope portion 54b extending from the first slope portion 54a and sloped further downward than the first slope portion 54a. there is Therefore, the second inclined portion 54b on the downstream end side is formed so as to bend further downward from the first inclined portion 54a. The first sloping portion 54a and the second sloping portion 54b are inclined downward toward the downstream side and slightly downward toward the side flow path 53 inside the toilet bowl. The outer portion of the downward slope portion 54 is connected to the outer wall 46 e of the rim water passage 46 .

As shown in FIG. 5, the downward slope portion 54 of the guide portion 50 is longer than the upward slope portion 72 in top view. A length L1 connecting the center of the upstream side and the center of the downstream side of the downward slope portion 54 is longer than the length L2 connecting the center of the upstream side and the center of the downstream side of the upward slope portion 72 . Also, the length L3 of the inner side of the downward slope portion 54 is longer than the length L4 of the inner side of the upward slope portion 72 .

As shown in FIG. 6, the downward slope portion 54 of the guide portion 50 is formed with a gentler slope than the upward slope portion 72 in a side view. For example, the inclination angle α1 of the descending slope portion 54 with respect to the horizontal is gentler than the inclination angle α2 of the ascending slope portion 72 with respect to the horizontal in a side view. The inclination angle α1 of the downward sloping portion 54 is the angle between the imaginary line connecting the upper end and the lower end of the downward sloping portion 54 and the horizontal. The inclination angle α1 of the downward slope portion 54 may be defined by the inclination angle of the first slope portion 54a. The inclination angle α2 of the upward slope portion 72 is the angle between the imaginary line connecting the upper end and the lower end of the upward slope portion 72 and the horizontal.

The ascending inclined portion 72 forms an inclined surface rising from the bottom surface 46 b to the upper portion of the guide portion 50 . The upward slope portion 72 is formed in an arc shape protruding toward the entrance portion 46a side. The upward slope portion 72 is formed so as to easily guide upward the wash water that has flowed from the inlet portion 46a toward the upward slope portion 72 . The upward slope portion 72 is formed so as to gradually increase in the height direction toward the downstream side of the rim water passage 46 . The upsloping portion 72 is formed so that the width in the left-right direction gradually narrows toward the downstream side of the rim water passage 46 . An outer portion of the upward slope portion 72 is connected to the outer wall 46 e of the rim water passage 46 .

The flat portion 74 forms a substantially horizontal flat surface at the top of the guide portion 50 . The flat portion 74 is connected to the downstream end of the upward slope portion 72 . Also, the flat portion 74 is connected to the upstream end of the downward slope portion 54 . The flat portion 74 is connected to the outer wall 46 e of the rim water passage 46 . The flat portion 74 forms a triangular shape together with the upward slope portion 72 when viewed from above. The upward slope portion 72 and the flat portion 74 are formed continuously, and the flat portion 74 and the downward slope portion 54 are formed continuously. A portion of the upward slope portion 72 and the downward slope portion 54 are formed continuously without the flat portion 74 interposed therebetween. A connection portion between the flat portion 74 and the upward slope portion 72, a connection portion between the flat portion 74 and the downward slope portion 54, and/or a connection portion between the upward slope portion 72 and the downward slope portion 54 are formed by steps. connected. The connection portion between the flat portion 74 and the upward slope portion 72, the connection portion between the flat portion 74 and the downward slope portion 54, and/or the connection portion between the upward slope portion 72 and the downward slope portion 54 are stepped. It may be connected smoothly without going through.

Next, operation (function) of the flush toilet according to the first embodiment of the present invention will be described with reference to FIGS. 3 to 6. FIG.
When the user presses, for example, a large flush operation button (not shown) after using the toilet, a signal from this operation button (not shown) is transmitted to the controller 36, and the flush toilet 1 is flushed. The cleaning operation for is started. When the user operates an operation button (not shown), the controller 36 supplies cleansing water from a water supply source such as a tap through the rim-side water supply channel 2a of the cleansing water supply device 6 to the inlet 46a of the rim water channel 46. do. Wash water is discharged into the rim water passage 46 from the rim-side water supply passage 2a as indicated by an arrow W0 (see FIG. 5).

As shown in FIG. 5, the wash water discharged into the rim water passage 46 from the rim-side water supply passage 2a reaches the guide portion 50 located opposite the inlet portion 46a. A portion of the wash water that has reached the guide portion 50 rises along the upward slope portion 72 toward the upper space within the rim water passage 46 as indicated by an arrow W1. The guide portion 50 allows the wash water to easily flow into the upper space above the center line C2 (see FIG. 6) in the rim water passage 46 in the height direction. Therefore, the air remaining in the upper part of the rim water passage 46 is agitated by the cleaning water, and the air can be easily discharged. Therefore, it is possible to further suppress the generation of abnormal sounds such as air burst sounds and air mixing sounds caused by discharging the accumulated air together with the cleaning water, and it is possible to further improve quietness. .

As indicated by an arrow W2, the wash water that has risen to the upper portion of the guide portion 50 flows from the upward slope portion 72 along the flat portion 74. As shown in FIG. Since the flat portion 74 has a triangular shape with a tapered front side, the washing water gradually flows down from the flat portion 74 to the downward slope portion 54 .

The wash water flowing into the downward slope portion 54 flows down along the first slope portion 54a as indicated by an arrow W3. The washing water flows linearly forward along the inclination direction of the first inclined portion 54a. Part of the washing water further flows down along the second inclined portion 54b from the downstream end of the first inclined portion 54a, as indicated by arrow W4 (see FIG. 6). Since the second inclined portion 54b is formed at a steeper inclination angle than the first inclined portion 54a, the washing water is accelerated more on the second inclined portion 54b. On the other hand, part of the washing water flows from the downstream end of the first sloped portion 54a to the downstream side (front side) in the air without following the second sloped portion 54b, as indicated by an arrow W5.

As indicated by an arrow W6, a flow from a side flow path 53 passing through the side of the guide portion 50 is formed on the side of the guide portion 50. As shown in FIG. Therefore, the flow from the side passage 53 passing along the side of the guide portion 50 can easily flow below the flow projecting from the downstream end of the first inclined portion 54a as indicated by the arrow W5. Therefore, the flow of cleansing water from the first inclined portion 54a and the flow of cleansing water from the side flow path 53 passing along the side of the guide portion 50 are less likely to collide with each other, and these flows are smoothly merged. It can be done easily.

As indicated by an arrow W7, the wash water flows straight forward through the outer portion 56 after joining. At this time, the air is agitated in the cleaning water as relatively small lumps, and relatively large lumps of air are less likely to be separated at the bent portion 58, thereby suppressing noise caused by the air.

The wash water turns rearward at the bend 58 and is discharged rearward from the rim spout 48 through the inner portion 60 . The wash water spouted from the rim spout portion 48 forms a swirling flow flowing downward while swirling inside the bowl portion 8, and the inner wall surface of the bowl portion 8 is washed.

After that, jet water spouting is started. First, the controller 36 sends a signal to the pressure pump 22 to activate it. The wash water stored in the water storage tank 20 is pressurized by the pressurization pump 22 and discharged from the jet water spout 16 a opened at the bottom of the bowl portion 8 . When the wash water discharged from the jet spout 16a flows into the drainage trap pipeline 12 and fills the drainage trap pipeline 12, a siphon phenomenon is caused. Due to this siphon phenomenon, accumulated water and dirt in the bowl portion 8 are sucked into the drain trap pipeline 12 and discharged from a drain pipe (not shown) on the downstream side. After a predetermined period of time has passed since flush water was supplied to the toilet body 4, the controller 36 terminates water spouting from the rim spout portion 48, stops the operation of the pressurizing pump 22, and completes a series of flushing operations.

Next, with reference to FIG. 7, an analysis example of the operation (action) of the flush toilet according to the first embodiment of the present invention will be described.
FIG. 7 is a computer simulation showing the distribution of flush water and air in the rim channel of the flush toilet according to the first embodiment of the present invention when flush water is supplied from the inlet into the rim channel. It is a figure which shows an example of the result of numerical analysis. In the numerical analysis result of FIG. 7, the white portion indicates the area where the cleaning water flows, and the black portion indicates the air area. FIG. 7 shows numerical analysis results at 0.15 seconds, 0.30 seconds, 0.45 seconds, and 0.60 seconds after the start of water supply to the rim water passage 46 from top to bottom.

According to the analysis results shown in FIG. 7, the wash water discharged into the rim water passage 46 from the rim-side water supply passage 2a rises toward the upper space in the rim water passage 46 along the upward slope portion 72. be. Therefore, the air accumulated in the upper part of the rim water passage 46 is agitated by the washing water, and this air is gradually discharged as relatively small-sized lumps. The wash water also flows downstream along the flat portion 74 . Part of the wash water tends to flow downstream in the upper space in the rim water passage 46, and the formation of air pockets in the regions G and H of the upper space in the rim water passage 46 is suppressed. I know there is. In addition, the wash water flows down along the downward slope portion 54 , and the wash water flows from the side flow path 53 passing along the side of the guide portion 50 while making it difficult to reduce the flow velocity of the wash water guided by the downward slope portion 54 . and smoothly merged. Therefore, the turbulence of the washing water flow after confluence is suppressed, and the occurrence of air pockets in the region H can also be suppressed. In this way, formation of air pockets, which are relatively large masses of air that tend to cause relatively loud noise, can be suppressed.

Next, the operation of the flush toilet 1 according to the first embodiment of the present invention will be described.
First, according to the flush toilet bowl 1 according to the first embodiment of the present invention, the guide portion 50 is formed so as to stand up from the bottom surface 46b, and the lateral flow path passes through the side of the guide portion 50 in the rim portion 10. 53 , and a downward slope portion 54 that slopes downward from the upper portion of the guide portion 50 toward the downstream side of the rim water passage 46 . As a result, part of the cleansing water is guided upward in the rim water passage 46 by the guide portion 50, and the air in the upper portion of the rim water passage 46 is easily discharged to the downstream side together with the cleansing water. The wash water that has risen is guided downward by the downward slope portion 54, and the pressure loss of the wash water exceeding the guide portion 50 can be suppressed. It can smoothly merge with the wash water from the side flow path 53 passing through the side of the. Therefore, it is possible to reduce the noise caused by relatively large masses of air being discharged when the cleansing water passes through the rim water passage 46, and to make it difficult for the flow velocity of the rim spout water to drop. Therefore, it is possible to improve the quietness of the rim spout of the flush toilet bowl 1 and the washing performance of the bowl portion 8 by the rim spout.

Next, according to the flush toilet 1 according to the first embodiment of the present invention, the downward slope portion 54 is formed so that the width becomes narrower toward the downstream side of the rim water passage 46, so that the guide portion 50 is When the wash water that has passed over is guided downward by the downward slope portion 54, the flow velocity of the wash water is increased, and the wash water from the side flow path 53 passing along the side of the guide portion 50 can be smoothly merged with the wash water. The flow of washing water can be easily guided.

Further, according to the flush toilet 1 according to the first embodiment of the present invention, the downward slope portion 54 extends to the bottom surface side region 70 of the rim water passage 46 . As a result, the wash water that has passed over the guide portion 50 can be guided to the bottom surface side region 70 by the downward slope portion 54, and the pressure loss of the wash water that has passed over the guide portion 50 can be further suppressed. The cleaning water from the side passage 53 passing through can be smoothly merged.

Furthermore, according to the flush toilet 1 according to the first embodiment of the present invention, the descending inclined portion 54 includes the first inclined portion 54a extending from the upper portion of the guide portion 50 and the first inclined portion 54a extending from the first inclined portion 54a. and a second inclined portion 54b that is inclined further downward than 54a. As a result, part of the washing water flowing down along the first inclined portion 54a can flow from the first inclined portion 54a to the space on the downstream side. It is possible to make it easier for the flow from the channel passing through the side of the to flow in. Therefore, the flow of cleansing water from the first inclined portion 54a and the flow of cleansing water from the channel passing along the side of the guide portion 50 can be more easily merged.

Furthermore, according to the flush toilet 1 according to the first embodiment of the present invention, the rising inclined portion 72 of the guide portion 50 makes it easier for the flush water flowing from the inlet portion 46a to rise to the upper portion of the guide portion 50, thereby allowing the rim to pass through. The air in the upper part of the water channel 46 can be easily removed to the downstream side together with the cleansing water by relatively fine lumps, and the pressure loss of the cleansing water rising to the upper part of the guide part 50 can be suppressed.

Furthermore, according to the flush toilet 1 according to the first embodiment of the present invention, the downward slope portion 54 of the guide portion 50 is longer than the upward slope portion 72 in top view. As a result, disturbance of the wash water guided by the upward slope portion 72 is suppressed, and a flow in the direction along the downward slope portion 54 is easily formed while making it difficult to reduce the flow velocity of the wash water guided by the downward slope portion 54 . This makes it easier to merge with the washing water from the channel passing along the side of the guide portion 50 more smoothly.

Furthermore, according to the flush toilet 1 according to the first embodiment of the present invention, the guide portion 50 further includes the flat portion 74 formed on the upper portion thereof, so that the flush water rising to the upper portion of the guide portion 50 is flattened. It is possible to make it easier to flow along the portion 74, suppress separation of the cleansing water from the upper portion, and suppress the occurrence of pressure loss due to turbulent flow of the cleansing water.

Furthermore, according to the flush toilet 1 according to the first embodiment of the present invention, the downward slope portion 54 of the guide portion 50 is formed with a gentler slope than the upward slope portion 72 in side view. As a result, the wash water is raised by the relatively steep upward slope portion 72 in a relatively short period of time, and the disturbance of the wash water guided by the upward slope portion 72 is suppressed, and the wash water guided by the downward slope portion 54 is suppressed. The wash water flows along the descending slope portion 54 for a relatively long time while making it difficult to reduce the flow velocity. It is possible to easily merge with the wash water from the flow path 53 smoothly.

Next, a flush toilet according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 11. FIG. The second embodiment is an example in which the descending inclined portion of the guide portion of the flush toilet according to the present invention is formed in a different shape. FIG. 8 is a schematic perspective view showing the inside of the rim water passage and the guide part with the upper part of the rim part of the flush toilet according to the second embodiment of the present invention omitted. FIG. 9 is a cross-sectional view showing a cross-section of the flush toilet according to the second embodiment of the present invention, taken along a line similar to the line III--III in FIG. FIG. 10 is a top view showing the inside of the rim water passage and the guide portion viewed from above with the upper portion of the rim portion of the flush toilet bowl according to the second embodiment of the present invention omitted. 11 is a cross-sectional view taken along line XI--XI in FIG. 10. FIG.
Since the flush toilet 101 according to the second embodiment has substantially the same structure as the flush toilet 1 according to the first embodiment described above, only the differences from the first embodiment of the second embodiment of the present invention will be described. However, similar parts are denoted by the same reference numerals in the drawings, and descriptions thereof are omitted.

As shown in FIG. 8, the flush toilet 1 includes a guide portion 150 that is provided in the rim water passage 46 and guides the flow of flush water. A guide portion 150 is provided on the outer portion 56 of the rim water passage 46 .

Next, referring to FIGS. 8 to 11, the structure of the guide portion 150 in this embodiment will be specifically described.
The guide portion 150 is formed to guide part of the flow of wash water to the upper space above the rim water passage 46 . The guide portion 150 is provided at a position facing the inlet portion 46 a of the rim water passage 46 and formed to protrude upward from the bottom surface 46 b of the rim water passage 46 .

The guide portion 150 further includes a side wall 52 that rises from the bottom surface 46 b and forms a side flow path 53 that passes along the side of the guide portion 150 in the rim portion 10 , A downward slope portion 154 that slopes downward toward the downstream side of the water channel 46, and an upward slope portion 72 that is provided at a position facing the inlet portion 46a and slopes upward from the bottom surface 46b toward the downstream side of the rim water channel 46. and a flat portion 74 formed thereon.

As shown in FIG. 9 , the side wall 52 defines a side flow path 53 inside the bowl portion 8 from the guide portion 150 between the side wall 52 and the inner vertical wall 46 d of the rim water passage 46 . The lateral flow path 53 extends along the inside of the toilet bowl of the guide portion 150 . The side flow path 53 extends from the upstream inner end of the guide portion 150 toward the downstream end of the downward slope portion 154 .

The downward slope portion 154 is formed so that its width becomes narrower toward the downstream side of the rim water passage 46 . For example, when viewed from above, the descending slope portion 154 is formed in a generally triangular shape, and is formed such that the width in the left-right direction gradually narrows toward the downstream side of the rim water passage 46 .

The downward slope portion 154 extends to the bottom side region 70 of the rim water passage 46 at its lower end. The bottom surface side region 70 is, for example, a region below half of the height of the rim water passage 46 on the side of the bottom surface 46b, and is a region in the vicinity of the bottom surface 46b. The bottom surface side region 70 may be defined by another method such as a region closer to the bottom surface 46 b than half of the height of the guide portion 150 .

As shown in FIG. 8 , the downward slope portion 154 is formed so as to gradually become lower in the height direction toward the downstream side of the rim water passage 46 . The descending inclined portion 154 is formed by an inclined surface having a substantially constant inclination angle from the upper portion of the guide portion 150 to the bottom surface 46b. The downwardly sloping portion 154 is downwardly slanted toward the downstream side and slightly slanted toward the side flow path 53 inside the toilet bowl. An outer portion of the downward slope portion 154 is connected to the outer wall 46 e of the rim water passage 46 .

As shown in FIG. 10, the downward slope portion 154 of the guide portion 150 is longer than the upward slope portion 72 in top view. A length L11 connecting the center of the upstream side and the center of the downstream side of the downward slope portion 154 is longer than the length L12 connecting the center of the upstream side and the center of the downstream side of the upward slope portion 72 . Also, the length L13 of the inner side of the downward slope portion 154 is longer than the length L14 of the inner side of the upward slope portion 72 .

The downward slope portion 154 of the guide portion 50 is formed with a gentler slope than the upward slope portion 72 in a side view. For example, the inclination angle α1 (see FIG. 6) of the downward slope portion 154 with respect to the horizontal is gentler than the inclination angle α2 (see FIG. 6) of the upward slope portion 72 with respect to the horizontal in a side view. The inclination angle α1 of the downward sloping portion 154 is the angle between the imaginary line connecting the upper end and the lower end of the downward sloping portion 154 and the horizontal. The inclination angle α2 of the upward slope portion 72 is the angle between the imaginary line connecting the upper end and the lower end of the upward slope portion 72 and the horizontal.

As shown in FIG. 11, the downwardly inclined portion 154 forms a relatively large inclined surface from the upper portion of the guide portion 150 to the bottom surface 46b. Accordingly, the thickness I1 of the outer wall 46e of the rim water passage 46 in the vicinity of the portion in contact with the descending slope portion 154 can be made smaller than the conventional thickness at the portion where the descending slope portion 154 is formed. If the descending slope 154 is not formed as in the conventional case, as indicated by the dotted line in FIG. The thickness I2 of the outer wall 46e was relatively large. On the other hand, by forming the descending slope portion 154, the upper part of the slope portion is removed, and the thickness I1 of the outer wall 46e of the portion where the descending slope portion 154 is formed can be reduced, and the porcelain The removal of moisture from the outer wall 46e is improved, and the defective rate of products can be reduced. In addition, the range of the outer wall 46e having a relatively large thickness can be further reduced, and the defective rate of the product can be reduced. For convenience of explanation, the second embodiment has been described, but the downward slope portion 54 is also formed in the first embodiment, and the defective rate of the product can be similarly reduced.

Again, in this embodiment, the rising slope portion 72 forms a slope rising from the bottom surface 46 b to the upper portion of the guide portion 150 . The flat portion 74 forms a substantially horizontal flat surface at the top of the guide portion 150 . The flat portion 74 is connected to the upstream end of the downward slope portion 154 .

Next, the operation (action) of the flush toilet according to the first embodiment of the present invention will be described with reference to FIG. 10 and the like.
When the flush toilet bowl 101 starts a large-flush flush operation, flush water is discharged from the rim-side water supply path 2a into the rim water supply path 46 as indicated by an arrow W10 (see FIG. 10).

As shown in FIG. 10, the wash water discharged into the rim water passage 46 from the rim-side water supply passage 2a reaches the guide portion 150 located opposite the inlet portion 46a. A portion of the wash water that has reached the guide portion 150 rises along the upward slope portion 72 toward the upper space in the rim water passage 46 as indicated by an arrow W11. The guide portion 150 allows the wash water to easily flow into the upper space above the center line C2 (see FIG. 6) in the rim water passage 46 in the height direction. Therefore, the air accumulated in the upper part of the rim water passage 46 is gently agitated by the cleansing water by the relatively small masses, and the air can be easily and quietly discharged by the relatively fine air masses. Therefore, it is possible to further suppress the generation of abnormal noises such as air bursting noises and air mixing noises due to the relatively large lumps of accumulated air being discharged together with the washing water at once. can be improved.

As indicated by an arrow W12, the wash water that has risen to the upper portion of the guide portion 150 easily flows along the flat portion 74 from the upward slope portion 72. As shown in FIG. Since the flat portion 74 has a triangular shape with a tapered front side, the washing water gradually flows down from the flat portion 74 to the downward slope portion 154 .

The wash water flowing into the downward slope portion 154 flows down along the downward slope portion 154 as indicated by an arrow W13. The wash water flows linearly forward along the direction of inclination of the downward slope portion 154 . The wash water flowing down along the downward slope portion 154 can smoothly flow down to the vicinity of the bottom surface 46b, and joins the flow from the side flow path 53 mainly in the vicinity of the bottom surface 46b.

As indicated by an arrow W14, a flow from a side flow path 53 passing through the side of the guide portion 150 is formed on the side of the guide portion 150. As shown in FIG. Since the flow of cleansing water from the downward slope 154 flows in substantially the same direction as the flow from the side flow path 53 , the flow of cleansing water from the downward slope 154 and the lateral direction passing through the side of the guide portion 50 The flow of washing water from the flow path 53 is less likely to collide, and these flows can be easily merged more smoothly.

As indicated by an arrow W15, the wash water flows straight forward through the outer portion 56 after joining. At this time, the air is agitated in the cleaning water, and the masses of air are less likely to be separated at the bent portion 58, so that the generation of abnormal noise due to the air can be suppressed.

The wash water turns rearward at the bend 58 and is discharged rearward from the rim spout 48 through the inner portion 60 . The wash water spouted from the rim spout portion 48 forms a swirling flow flowing downward while swirling inside the bowl portion 8, and the inner wall surface of the bowl portion 8 is washed.

Next, the operation of the flush toilet 101 according to the second embodiment of the present invention will be described.
In the second embodiment of the present invention configured as described above, part of the wash water is guided upward in the rim water passage 46 by the guide portion 150, and the air in the upper portion of the rim water passage 46 is directed downstream together with the wash water. Washing water that has risen to the upper portion of the guide portion 150 is guided downward by the downward sloping portion 54 to suppress the pressure loss of the washing water exceeding the guide portion 150 and is guided by the downward sloping portion 54. It is possible to smoothly merge with the washing water from the side flow path 53 passing along the side of the guide part 150 while making it difficult for the flow velocity of the washing water to drop. Therefore, it is possible to reduce the noise caused by relatively large masses of air being discharged when the cleansing water passes through the rim water passage 46, and to make it difficult for the flow velocity of the rim spout water to drop. Therefore, the calmness of the rim spout of the flush toilet 101 and the washing performance of the bowl portion 8 by the rim spout can be improved.

1: Flush toilet bowl 8: Bowl portion 9: Dirt receiving surface 10: Rim portion 12a: Inlet portion 46: Rim water passage 46a: Inlet portion 46b: Bottom surface 48: Rim spout portion 50: Guide portion 52: Side wall 53: Side Directional path 54 : downward inclined portion 54 a : first inclined portion 54 b : second inclined portion 56 d : inlet portion 70 : bottom side region 72 : upward inclined portion 74 : flat portion 101 : flush toilet 150 : guide portion 154 : downward slope

Claims (8)

A flush toilet that is flushed with flush water supplied from a flush water source to discharge waste,
a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed on the upper edge of the waste receiving surface;
a rim spout for spouting cleansing water from the rim into the bowl;
a rim water passage extending to the rim spout in the rim;
a guide portion provided in the rim water passage,
The guide portion is provided at a position facing the inlet portion of the rim water passage and is formed to protrude upward from the bottom surface of the rim water passage,
the guide portion has a side wall that rises from the bottom surface and forms a lateral flow path that passes along the side of the guide portion in the rim portion;
A flush toilet, comprising: a descending slope portion that slopes downward from an upper portion of the guide portion toward a downstream side of the rim water passage. 2. The flush toilet according to claim 1, wherein the downwardly inclined portion is formed so that the width thereof becomes narrower toward the downstream side of the rim water passage. 3. The flush toilet according to claim 1, wherein said downwardly inclined portion extends to a bottom side region of said rim water passage. The downward slope portion includes a first slope portion extending from the upper portion of the guide portion, and a second slope portion extending from the first slope portion and further sloped downward from the first slope portion. The flush toilet according to any one of claims 1 to 3. 5. The guide portion further comprises an upwardly inclined portion provided at a position facing the inlet portion and inclined upward from the bottom surface toward the downstream side of the rim water passage. 1. The flush toilet bowl according to 1. 6. The flush toilet according to claim 5, wherein the downward slope portion of the guide portion is longer than the upward slope portion in top view. 7. The flush toilet according to any one of claims 1 to 6, wherein said guide portion further comprises a flat portion formed on its upper portion. 6. The flush toilet according to claim 5, wherein the downward slope portion of the guide portion is formed to have a gentler slope than the upward slope portion in a side view.

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