Water-washable toilet
The flush toilet design addresses residual water leakage by using an inclined surface to guide flushing water into the bowl, enhancing cleaning effectiveness and preventing water shutoff misconceptions.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- TOTO LTD
- Filing Date
- 2024-12-25
- Publication Date
- 2026-07-07
Smart Images
Figure 2026113105000001_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that discharges dirt with flush water supplied from a flush water source.
Background Art
[0002] Conventionally, as a flush toilet that discharges dirt with flush water supplied from a flush water source, for example, as described in Patent Documents 1 and 2, flush water discharged from a rim water outlet provided in the rim portion of the toilet body swirls along the shelf surface and then is guided into the bowl portion. Such a flush toilet is known. In such a conventional flush toilet, the bottom surface of the rim water guide path on the upstream side of the rim water outlet and the shelf surface on the downstream side of the rim water outlet are directly connected without a step from the upstream side to the downstream side, and are formed as continuous and smooth surfaces with each other.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, in the conventional flush toilets described in Patent Documents 1 and 2 mentioned above, the bottom surface of the rim water guide path and the shelf surface on the downstream side of the rim water outlet are directly connected without a step and are formed as continuous and smooth surfaces with each other. Therefore, after the toilet cleaning is completed, there is a problem that the residual water of the flush water remaining in the rim water guide path flows out drop by drop from the rim water outlet later. Furthermore, if a user discovers traces of residual water leaking from such a rim-type water channel, there is a risk that some users may mistakenly believe that there is a water shutoff problem upstream of the rim outlet (on the toilet's water source side). Therefore, a pressing issue in recent years has been how to effectively manage residual water in the rim's water channel while simultaneously enhancing the toilet bowl's flushing effect.
[0005] Therefore, the present invention was made to solve the problems of the prior art described above and the issues that have been requested in recent years, and aims to provide a flush toilet that can effectively manage residual water in the rim water channel while improving the toilet bowl cleaning effect. [Means for solving the problem]
[0006] To achieve the above-mentioned objectives, the present invention provides a flush toilet that discharges waste using flushing water supplied from a flushing water source, comprising: a bowl portion including a waste receiving surface for receiving waste and a rim portion formed above the waste receiving surface; a drain trap portion having an inlet connected below the bowl portion for discharging waste from the bowl portion; a rim water channel provided in the rim portion for guiding flushing water supplied from the flushing water source towards the bowl portion; a rim water outlet portion including a rim water outlet provided at the downstream end of the rim water channel; and a shelf portion including a shelf surface for guiding the flushing water discharged from the rim water outlet into the bowl portion, wherein the rim portion has an inner surface whose inner end is connected to the downstream end of the rim water channel; the rim water outlet is provided at the connection between the downstream end of the rim water channel and the end of the inner surface of the rim, the lower end of this connection portion is provided above the shelf surface; and the bottom surface of the rim water channel and the shelf surface are connected by an inclined surface. In the present invention configured as described above, the flushing water supplied from the flushing water source to start flushing the toilet bowl passes through the rim water channel, is discharged from the rim water outlet of the rim water outlet, and then flows over the shelf surface of the shelf section to be guided into the bowl section. Then, the flushing water introduced into the bowl section causes the waste in the bowl section, which is collected by the waste receiving surface, to be discharged through the drain trap section, thus flushing the toilet. Here, the rim outlet is provided at the connection point between the downstream end of the rim water channel and the end of the inner surface of the rim, and the lower end of this connection point is provided above the shelf surface, thereby creating a step between the bottom surface of the rim water channel and the shelf surface of the shelf section. In addition, because the bottom surface of the rim water channel and the shelf surface of the shelf section are smoothly connected by an inclined surface, the flushing water in the rim water channel is discharged from the rim outlet and reliably guided from the inclined surface to the shelf surface of the shelf section, thereby enhancing the toilet bowl flushing effect. Furthermore, even after the toilet flushing is complete, it is possible to prevent the flushing water from accumulating in the rim water channel after the flushing water has passed through, thereby suppressing residual flushing water in the rim water channel. Furthermore, after the toilet bowl has finished flushing, it is possible to suppress the gradual outflow of residual flushing water from the rim water outlet, thereby improving water drainage. Therefore, even after toilet flushing is complete, residual water stains caused by water flowing out of the rim channel can be suppressed, thus preventing users who discover these stains from mistakenly believing that there is a water shutoff problem on the toilet's water supply side. As a result, it is possible to provide a flush toilet that enhances the toilet bowl cleaning effect while effectively managing residual water in the rim water channel.
[0007] In the present invention, preferably, the inclined surface is provided downstream of the cross-sectional area of the rim water channel, which is formed in a direction perpendicular to the central axis direction of the rim water channel from the lower end of the connection portion in a plan view. In the present invention configured as described above, the inclined surface connecting the bottom surface of the rim water channel and the shelf surface of the shelf section is provided downstream of the flow path cross-section of the rim water channel, which is formed in a direction perpendicular to the central axis direction of the flow path of the rim water channel, from the lower end of the connection between the downstream end of the rim water channel and the end of the inner surface of the rim, in a plan view. Therefore, the cleaning water in the rim water channel can be discharged from the rim outlet and reliably guided from the inclined surface to the shelf surface of the shelf section. Therefore, the toilet bowl cleaning effect can be further enhanced.
[0008] In the present invention, preferably, the inclined surface comprises an upstream connecting portion connected to the downstream end of the bottom surface of the rim water channel and a downstream connecting portion connected to the shelf surface, wherein the width of the downstream connecting portion on the inclined surface is set to be greater than the width of the upstream connecting portion. In the present invention configured as described above, the width of the downstream connection portion on the inclined surface connecting the bottom surface of the rim water channel and the shelf surface is set to be larger than the width of the upstream connection portion. Therefore, the cleaning water in the rim water channel can be discharged from the rim outlet and reliably guided from the upstream connection portion on the inclined surface to the shelf surface of the shelf connected to the downstream connection portion. Therefore, the toilet bowl cleaning effect can be further enhanced.
[0009] In the present invention, preferably, the rim water channel comprises a first rim water channel and a second rim water channel, the rim discharge section comprises a first rim discharge section including a first rim discharge port provided at the downstream end of the first rim water channel, and a second rim discharge section including a second rim discharge port provided at the downstream end of the second rim water channel, the second rim discharge port is provided behind the first rim discharge port, and the first maximum height position of the bottom surface of the first rim water channel is set higher than the second maximum height position of the bottom surface of the second rim water channel. In the present invention configured as described above, the flushing water supplied from the flushing water source to start flushing the toilet bowl passes through the first rim water channel and the second rim water channel to the first rim water outlet and the second rim water outlet, respectively, and is discharged from the first rim water outlet and also from the second rim water outlet located behind the first rim water outlet. As a result, the flushing water discharged from the two rim water outlets can effectively flush the toilet bowl. Here, since the first maximum height position of the bottom surface of the first rim water channel is set higher than the second maximum height position of the bottom surface of the second rim water channel, it is possible to increase the amount of cleaning water distributed to the second rim water channel compared to the first rim water channel, and in the middle of cleaning, powerful cleaning water can be discharged from the second rim discharge port, which is located behind the first rim discharge port. This improves the efficiency of waste discharge from the bowl section and allows for the early discharge of residual water in the first rim water channel after cleaning is complete. Furthermore, the cleaning water in the first rim channel is guided into the bowl section by flowing from the first rim outlet through the inclined surface and over the shelf surface of the shelf section, with its potential energy increased to a higher level. Therefore, the flushing water introduced into the bowl ensures that the waste in the bowl, which is being collected by the waste receiving surface, is reliably discharged from the drain trap, thereby improving toilet flushing performance. Furthermore, even after the toilet flushing is complete, the system makes it difficult for flushing water to accumulate, particularly in the first rim water channel after the flushing water has passed through, thereby suppressing residual flushing water in the first rim water channel. Furthermore, after the toilet flushing is complete, it is possible to suppress the gradual outflow of residual flushing water from the first rim water outlet, particularly from the first rim water channel, thereby improving water drainage. Therefore, even after toilet flushing is complete, residual water residue caused by the outflow of residual water from the first rim water channel can be suppressed, thus preventing users who discover this residue from mistakenly believing that there is a water shutoff problem on the toilet's water supply side.
[0010] In the present invention, preferably, there is further a main channel provided upstream of the first rim water channel and the second rim water channel, the main channel having a branching section at its downstream end that branches off to the first rim water channel and the second rim water channel respectively, and the first maximum height position on the bottom surface of the first rim water channel is provided on the branching section side of the first rim outlet. In the present invention configured as described above, the first maximum height position of the bottom surface of the first rim water channel is located on the branching side of the main water channel than the first rim discharge port. As a result, the amount of cleaning water distributed from the branching port to the second rim water channel can be increased compared to the first rim water channel, and in the middle of the cleaning process, powerful cleaning water can be discharged from the second rim discharge port, which is located behind the first rim discharge port. This improves the efficiency of waste discharge from the bowl section and allows for the early discharge of residual water in the first rim water channel after cleaning is complete. Furthermore, the cleaning water in the first rim conduit can be passed through the conduit while its potential energy is increased on the branching side of the main conduit. Therefore, by directing the flushing water in the first rim channel from the first rim outlet through the inclined surface to the shelf surface of the shelf section, it can be effectively guided into the bowl section, thereby effectively improving the toilet flushing performance. Furthermore, even after the toilet flushing is complete, the system makes it difficult for flushing water to accumulate, especially in the first rim water channel after the flushing water has passed through. This effectively suppresses residual flushing water in the first rim water channel, further improving drainage.
[0011] In the present invention, preferably, the bottom surface of the first rim water channel is set to a height position approximately the same as the first maximum height position over the flow channel section from its upstream side to the first rim water outlet. In the present invention configured as described above, for the bottom surface of the first rim water guide channel, since it is set at a height position substantially the same as the first maximum height position over the flow path section from its upstream side to the first rim water discharge port, the washing water in the first rim water guide channel can be discharged from the first rim water discharge port while maintaining a state where its potential energy is increased. Therefore, for the washing water in the first rim water guide channel, it can be effectively guided into the bowl part by flowing on the shelf surface of the shelf part through the inclined surface from the first rim water discharge port, so that the toilet washing performance can be effectively improved. Also, even in the state where the toilet washing is finished, particularly in the first rim water guide channel after the washing water has passed through, it is possible to make it difficult for the washing water to stay, so that the residual water of the washing water in the first rim water guide channel can be effectively suppressed, and the water drainage can be further improved.
[0012] In the present invention, preferably, the first rim water guide channel is set such that the first flow path length along the flow path central axis direction thereof is longer than the second flow path length along the flow path central axis direction of the second rim water guide channel. In the present invention configured as described above, since the first flow path length along the flow path central axis direction of the first rim water guide channel is set to be longer than the second flow path length along the flow path central axis direction of the second rim water guide channel, particularly for the washing water in the first rim water guide channel, compared with the washing water in the second rim water guide channel, it is in a state where its potential energy is increased to a higher level and its water flow rate is ensured to be larger, and it can flow on the shelf surface of the shelf part through the inclined surface from the first rim water discharge port and be surely guided into the bowl part. Therefore, for the washing water in the first rim water guide channel, it can be effectively guided into the bowl part by flowing on the shelf surface of the shelf part through the inclined surface from the first rim water discharge port, so that the toilet washing performance can be effectively improved.
Advantages of the Invention
[0013] According to the water-washed toilet of the present invention, while enhancing the toilet washing effect, it is possible to effectively take measures against residual water in the rim water guide channel.
Brief Description of the Drawings
[0014] [Figure 1] It is a center side cross-sectional view of a flush toilet according to an embodiment of the present invention. [Figure 2] It is a plan cross-sectional view taken along line II-II of FIG. 1. [Figure 3] It is a front cross-sectional view taken along line III-III of FIG. 2. [Figure 4] It is a partial enlarged perspective view of the vicinity of the inlet of the first rim water channel of a flush toilet according to an embodiment of the present invention, enlarged. [Figure 5] It is a partial enlarged perspective view of the vicinity of the first rim water outlet of the first rim water channel of a flush toilet according to an embodiment of the present invention, and the inclined surface and shelf surface in the vicinity of the downstream side thereof, enlarged. [Figure 6] It is a partial enlarged plan cross-sectional view of the vicinity of the first rim water outlet of the first rim water channel of a flush toilet according to an embodiment of the present invention, and the inclined surface and shelf surface in the vicinity of the downstream side thereof, enlarged. [Figure 7A] It is a diagram showing an example of the result of simulating the flow of washing water from each of the first rim water channel and the second rim water channel into the bowl during toilet washing in a flush toilet according to an embodiment of the present invention. [Figure 7B] As a comparative example of the simulation result shown in FIG. 7A, it is a diagram showing an example of the result of simulating the flow from each of the first rim water channel and the second rim water channel into the bowl during toilet washing using a conventional flush toilet. [Figure 8A] It is a diagram showing an example of the result of simulating the flow of washing water from the first rim water outlet into the bowl during toilet washing in a flush toilet according to an embodiment of the present invention. [Figure 8B] As a comparative example of the simulation result shown in FIG. 8A, it is a diagram showing an example of the result of simulating the flow of washing water from the first rim water outlet into the bowl during toilet washing using a conventional flush toilet.
Embodiments for Carrying Out the Invention
[0015] A flush toilet according to one embodiment of the present invention will be described below with reference to the attached drawings. First, the basic structure of the flush toilet according to this embodiment will be described with reference to Figures 1 to 3. Figure 1 is a central side cross-sectional view of a flush toilet according to one embodiment of the present invention. Figure 2 is a plan cross-sectional view taken along line II-II in Figure 1. Furthermore, Figure 3 is a front cross-sectional view taken along line III-III in Figure 2. In this specification, the front and rear sides of a flush toilet are defined as "front" and "rear" respectively, with the user in front of the flush toilet viewing it, and the right and left sides of a flush toilet are defined as "right" and "left" respectively.
[0016] Next, as shown in Figures 1 to 3, the flush toilet 1 is a floor-drain type flush toilet placed on the floor surface F, and is a wash-down type flush toilet that washes away waste with the flowing water action caused by the difference in water pressure within the bowl portion 4 of the toilet body 2. Furthermore, the flush toilet 1 comprises a ceramic toilet bowl body 2 and a water storage tank 6, which is a water source (flush water source) that stores flushing water to wash the toilet bowl body 2. Furthermore, the toilet bowl body 2 is equipped with a bowl section 4 on the front side, and a main water channel 8 is formed at the upper rear of the bowl section, with an opening 8a at its upstream end that communicates with the water storage tank 6.
[0017] Next, as shown in Figures 1 and 2, the bowl portion 4 of the toilet body 2 includes a bowl-shaped waste receiving surface 10 for receiving waste, a rim portion 12 formed above the waste receiving surface 10, and a pot portion 16 formed below the waste receiving surface 10, in which a water reservoir 14 is formed inside. Furthermore, the toilet bowl body 2 is equipped with a drain trap section 18 which includes an inlet section 18a connected to the lower part of the bowl section 4's pot section 16, and a drain pipe 18b that discharges waste from the bowl section 4 to the lower rear of the bowl section 4.
[0018] Next, as shown in Figure 1, the water storage tank 6 described above is equipped with a drain valve 20 that opens and closes the drain port 6a at its bottom. For example, when the user opens the operating lever (not shown), the drain valve 20 rises and the drain port 6a is opened, allowing the flushing water in the water storage tank 6 to flow from the drain port 6a into the main water channel 8 of the toilet bowl body 2 through the opening 8a of the main water channel 8. The washing water in the main channel 8 is then divided and flows into two rim conduits 22 and 24 (first rim conduit 22 and second rim conduit 24), which will be described later, on their downstream side, and is then discharged from two rim outlets 26 and 28 (first rim outlet 26 and second rim outlet 28), which will be described later, at their downstream ends.
[0019] In this embodiment, the water source for washing may be a water supply system using direct water pressure, a water supply system using a flush valve, or a system using a pump to supply washing water, in addition to the form of the water storage tank 6. Furthermore, the flush toilet 1 of this embodiment may be a siphon-type flush toilet that utilizes a siphon action to discharge waste from the bowl 4 to the outside through the drain trap 18, in addition to being a wash-down type flush toilet.
[0020] Next, as shown in Figures 1 to 3, the main water channel 8 described above extends in the front-to-back direction from the center in the left-to-right direction behind the bowl portion 4 of the toilet body 2. Furthermore, the downstream front end of the main channel 8 is equipped with a branching section 8b that branches into the first rim channel 22 and the second rim channel 24. The first rim conduit 22 extends to the first rim outlet 26 at its downstream end, and the second rim conduit 24 extends to the second rim outlet 28 at its downstream end. The cleaning water stored in the water storage tank 6 is then supplied from the main water channel 8 through the first rim water channel 22 and the second rim water channel 24, respectively, to the first rim outlet 26 and the second rim outlet 28. In other words, the first rim outlet 26 and the second rim outlet 28 each function as a first rim discharge section and a second rim discharge section, respectively, that discharge cleaning water in a direction that forms a swirling flow that rotates in the same direction. In this embodiment, the flush toilet 1 forms a counterclockwise swirling flow in a plan view.
[0021] Furthermore, as shown in Figures 1 to 3, the first rim spout 26 is located on the front left side of the rim portion 12 of the bowl portion 4 when viewed from the front. On the other hand, the second rim spout 28 is located on the rear side of the right side when viewed from the front on the rim portion 12 of the bowl portion 4. Furthermore, as shown in Figures 1 and 2, the first rim outlet 26 is located in front of the front end 14a of the water reservoir 14. On the other hand, the second rim outlet 28 is located behind the rear end 14b of the water reservoir 14.
[0022] Next, with reference to Figures 1 to 6, the structure of the first rim water channel 22 of the flush toilet 1 of this embodiment, as well as the structure of the first rim water outlet 26 and the vicinity of its downstream side, will be described in detail. First, Figure 4 is a partially enlarged perspective view showing the area near the inlet of the first rim water channel of a flush toilet according to one embodiment of the present invention. Figures 5 and 6 show a partially enlarged perspective view and a partially enlarged plan cross-sectional view, respectively, showing the area near the first rim outlet of the first rim water channel of a flush toilet according to one embodiment of the present invention, as well as the inclined surface and shelf surface near the downstream side thereof.
[0023] First, as shown in Figures 1, 2, 5, and 6, the toilet bowl body 2 further includes a shelf section 30 which includes a shelf surface 30a that guides the flushing water discharged from the first rim outlet 26 into the bowl section 4. Next, the rim portion 12 has an inner rim surface 32 whose inner end 32a is connected to the downstream end 22a of the first rim water channel 22. Furthermore, the first rim outlet 26 is provided at the connection point 34 between the downstream end of the first rim water channel 22 and the end 32a of the inner surface 32 of the rim. The lower end 34a of this connection point 34 is located above the shelf surface 30a. Furthermore, the bottom surface 22b of the first rim water channel 22 and the shelf surface 30a are connected by an inclined surface 36.
[0024] Next, as shown in Figure 6, the inclined surface 36 is located downstream of the channel cross-section S1 of the first rim water channel 22, which is formed in a direction perpendicular to the channel central axis C1 direction of the first rim water channel 22 from the lower end 34a of the connection portion 34 in a plan view. Furthermore, the inclined surface 36 includes an upstream connecting portion 36a that is connected to the downstream end 22a of the bottom surface 22b of the first rim water channel 22, and a downstream connecting portion 36b that is connected to the shelf surface 30a. Furthermore, the width W1 of the downstream connection portion 36b on the inclined surface 36 is set to be greater than the width W2 of the upstream connection portion 36a (W1 > W2).
[0025] Next, as shown in Figures 1, 3, and 4, in the main channel 8, the branching section 8b at its downstream end branches off to the inlet sections 22c and 24a, which are the upstream ends of the first rim channel 22 and the second rim channel 24, respectively. Furthermore, the first maximum height position P1 of the bottom surface 22b of the first rim water conduit 22 is located on the side of the branch section 8b than the first rim outlet 26, and more specifically, it is located near the downstream side of the inlet section 22c of the first rim water conduit 22. Furthermore, the second rim outlet 28 is located further back than the first rim outlet 26, and the first maximum height position P1 of the bottom surface 22b of the first rim water channel 22 is set higher than the second maximum height position P2 of the bottom surface 24b of the second rim water channel 24. Here, the first maximum height position P1 of the bottom surface 22b of the first rim water channel 22 is set higher by a height dimension H1 [mm] (for example, H1 = approximately 5 mm) than the height position P0 of the bottom surface 22d on its upstream side.
[0026] Next, as shown in Figure 1, the bottom surface 22b of the first rim water conduit 22 is set at approximately the same height as the first maximum height position P1 over the flow channel section A from the first maximum height position P1 upstream to the height position P3 of the bottom surface 26a of the first rim outlet 26, forming a bottom surface that slopes slightly downward from the upstream side to the downstream side. Furthermore, as shown in Figure 2, the first rim water conduit 22 has a first channel length L1 along its channel center axis C1 direction that is longer than the second channel length L2 along the channel center axis C2 direction of the second rim water conduit 24 (L1 > L2).
[0027] Next, Figure 7A shows an example of the results of a simulation of the flow of flushing water from the first rim water channel 22 and the second rim water channel 24 into the bowl section 4 during toilet flushing in the flush toilet 1 according to this embodiment. On the other hand, Figure 7B shows an example of the results of a simulation of the flow from the first rim water channel 122 and the second rim water channel 124 into the bowl section 104 during toilet flushing using a conventional flush toilet, as a comparison example of the simulation results shown in Figure 7A. Figure 8A is a diagram showing an example of the results of a simulation of the flow of flushing water from the first rim outlet 26 into the bowl section 4 during toilet flushing in the flush toilet 1 according to this embodiment. On the other hand, Figure 8B is a diagram showing an example of the results of a simulation of the flow of flushing water from the first rim outlet 126 into the bowl section 104 during toilet flushing using a conventional flush toilet 100, as a comparison example of the simulation results shown in Figure 8A. Here, for both the flush toilet 1 according to this embodiment and the conventional flush toilet 100 shown in Figures 7A to 8B, the flow of flushing water in each first rim water channel 22, 122 and each second rim water channel 24, 124, as well as in each first rim outlet 26, 126 and each second rim outlet 28, 128, 8.5 seconds after the start of toilet flushing is shown. In the flush toilet 1 according to this embodiment shown in Figures 7A and 8A, compared with the conventional flush toilet 100 shown in Figures 7B and 8B at the same time, it was confirmed that the amount of flushing water distributed from the main water channel 8 to the second rim water channel 24 could be increased compared to the first rim water channel 22, and that in the middle of flushing, powerful flushing water could be discharged into the bowl section 4 from the second rim water outlet 28, which is located behind the first rim water outlet 26. Furthermore, it was confirmed that the drainage of flushing water in the first rim water channel 22 of the flush toilet 1 according to this embodiment is better than that of the first rim water channel 122 of the conventional flush toilet 100, and that any remaining water in the first rim water channel 22 can be discharged quickly.
[0028] Next, the operation of the flush toilet 1 according to this embodiment will be explained with reference to Figures 1 to 8B. First, according to the flush toilet 1 of this embodiment, the flushing water supplied from the water storage tank 6, which is the flushing water source, in order to start flushing the toilet bowl, passes through the rim water channels 22, 24, is discharged from the rim water outlets 26, 28 of the rim water outlets, and then flows over the shelf surface 30a of the shelf section 30 and is guided into the bowl section 4. Then, the cleaning water introduced into the bowl section 4 causes the waste in the bowl section 4, which is being received by the waste receiving surface 10, to be discharged from the drain trap section 18, and the toilet bowl is cleaned. Here, the first rim outlet is provided at the connection portion 34 between the downstream end 22a of the first rim water channel 22 and the end portion 32a of the inner surface 32 of the rim, and the lower end 34a of this connection portion 34 is provided above the shelf surface 30a, thereby creating a step between the bottom surface 22b of the first rim water channel 22 and the shelf surface 30a of the shelf portion 30. In addition, because the bottom surface 22b of the first rim water channel 22 and the shelf surface 30a of the shelf section 30 are smoothly connected by the inclined surface 36, the flushing water in the first rim water channel 22 is discharged from the first rim water outlet 26 and reliably guided from the inclined surface 36 to the shelf surface of the shelf section, thereby enhancing the toilet flushing effect. Furthermore, even after the toilet flushing is complete, it is possible to prevent the flushing water from accumulating in the first rim water channel 22 after the flushing water has passed through, thereby suppressing residual flushing water in the first rim water channel 22. Furthermore, after the toilet bowl has finished flushing, it is possible to suppress the gradual outflow of residual flushing water from the first rim water channel 22 through the first rim outlet 26, thereby improving water drainage. Therefore, even after toilet flushing is complete, residual water residue caused by the outflow of residual water from the first rim water channel 22 can be suppressed, thus preventing users who discover this residue from mistakenly believing that there is a water shutoff problem on the toilet's water supply side. As a result, it is possible to provide a flush toilet that can effectively manage residual water in the first rim water channel 22 while enhancing the toilet bowl cleaning effect.
[0029] Next, according to the flush toilet 1 of this embodiment, the inclined surface 36 connecting the bottom surface 22b of the first rim water channel 22 and the shelf surface 30a of the shelf section 30 is provided downstream of the flow path cross-section S1 of the first rim water channel 22, which is formed in a direction perpendicular to the flow path central axis C1 direction of the first rim water channel 22, from the lower end 34a of the connection portion 34 between the downstream end 22a of the first rim water channel 22 and the end 32a of the inner surface 32 of the rim. This ensures that the cleaning water in the first rim water channel 22 is discharged from the first rim outlet 26 and reliably guided from the inclined surface 36 to the shelf surface 30a of the shelf section 30. Therefore, the toilet bowl cleaning effect can be further enhanced.
[0030] Furthermore, according to the flush toilet 1 of this embodiment, the width W1 of the downstream connection portion 36b on the inclined surface 36 connecting the bottom surface 22b and the shelf surface 30a of the first rim water channel 22 is set to be larger than the width W2 of the upstream connection portion 36a (W1 > W2). This ensures that the cleaning water in the first rim water channel 22 is discharged from the first rim outlet 26 and reliably guided from the upstream connection part 36a of the inclined surface 36 to the shelf surface 30a of the shelf section 30 which is connected to the downstream connection part 36b. Therefore, the toilet bowl cleaning effect can be further enhanced.
[0031] Furthermore, according to the flush toilet 1 of this embodiment, the flushing water supplied from the flushing water source (water storage tank 6) to start flushing the toilet bowl passes through the first rim water conduit 22 and the second rim water conduit 24 to the first rim water outlet and the second rim water outlet, respectively, and is discharged from the first rim water outlet 26 and also from the second rim water outlet 28 which is located behind the first rim water outlet 26. As a result, the flushing water discharged from the two rim water outlets 26 and 28 can effectively flush the toilet bowl. Here, the first maximum height position P1 of the bottom surface 22b of the first rim water channel 22 is set higher than the second maximum height position P2 of the bottom surface 24b of the second rim water channel 24. This makes it possible to increase the amount of cleaning water distributed to the second rim water channel 24 compared to the first rim water channel 22, and in the middle of the cleaning process, powerful cleaning water can be discharged from the second rim outlet 28, which is located behind the first rim outlet 26. This improves the efficiency of waste discharge from the bowl section 4, and also allows for the early discharge of residual water in the first rim water channel 22 after cleaning is complete. Furthermore, the cleaning water in the first rim water channel 22 is guided into the bowl section 4 by flowing from the first rim outlet 26 through the inclined surface 36 and onto the shelf surface 30a of the shelf section 30, with its potential energy increased to a higher level. Therefore, the flushing water introduced into the bowl portion 4 ensures that the waste in the bowl portion 4, which is being received by the waste receiving surface 10, is reliably discharged from the drain trap portion 18, thereby improving the toilet flushing performance. Furthermore, even after the toilet bowl has finished flushing, the system makes it difficult for flushing water to accumulate in the first rim water channel 22, especially after the flushing water has passed through it, thereby suppressing residual flushing water in the first rim water channel 22. Furthermore, after the toilet bowl has finished flushing, it is possible to suppress the subsequent trickling outflow of residual flushing water from the first rim water outlet 26, thereby improving water drainage. Therefore, even after the toilet flushing is complete, residual water residue caused by the outflow of residual water from the first rim water channel 22 can be suppressed, thus preventing users who discover this residue from mistakenly believing that there is a water shutoff problem on the toilet's water supply side (water storage tank 6).
[0032] Next, according to the flush toilet 1 of this embodiment, the first maximum height position P1 of the bottom surface 22b of the first rim water channel 22 is located on the side of the branching portion 8b of the main water channel 8, rather than the first rim water outlet 26. This allows the amount of cleaning water distributed from the branch section 8b of the main water channel 8 to the second rim water channel 24 to be increased compared to the first rim water channel 22, and in the middle of the cleaning process, powerful cleaning water can be discharged from the second rim outlet 28, which is located behind the first rim outlet 26. This improves the efficiency of waste discharge from the bowl section 4, and also allows for the early discharge of residual water in the first rim water channel 22 after cleaning is complete. Furthermore, the cleaning water in the first rim water channel 22 can be passed through the channel while its potential energy is increased on the branching section 8b side of the main channel 8. Therefore, by directing the flushing water in the first rim water channel 22 from the first rim outlet 26 through the inclined surface 36 and onto the shelf surface 30a of the shelf section 30, it can be effectively guided into the bowl section 4, thereby effectively improving the toilet flushing performance. Furthermore, even after the toilet bowl has finished flushing, the system makes it difficult for flushing water to accumulate, especially in the first rim water channel 22 after the flushing water has passed through. This effectively suppresses residual flushing water in the first rim water channel 22, further improving drainage.
[0033] Furthermore, according to the flush toilet 1 of this embodiment, the bottom surface 22b of the first rim water channel 22 is set to approximately the same height as the first maximum height position P1 over the flow channel section A from the upstream side to the first rim water outlet 26. This allows the cleaning water in the first rim water channel 22 to be discharged from the first rim outlet 26 while maintaining a state of increased potential energy. Therefore, by directing the flushing water in the first rim water channel 22 from the first rim outlet 26 through the inclined surface 36 and onto the shelf surface 30a of the shelf section 30, it can be effectively guided into the bowl section 4, thereby effectively improving the toilet flushing performance. Furthermore, even after the toilet bowl has finished flushing, the system makes it difficult for flushing water to accumulate, especially in the first rim water channel 22 after the flushing water has passed through. This effectively suppresses residual flushing water in the first rim water channel 22, further improving drainage.
[0034] Furthermore, according to the flush toilet 1 of this embodiment, the length L1 of the first channel along the direction of the channel center axis C1 of the first rim channel 22 is set to be longer than the length L2 of the second channel along the direction of the channel center axis C2 of the second rim channel 24 (L1 > L2). As a result, the cleaning water in the first rim water channel 22 can be guided into the bowl section 4 from the first rim outlet 26, through the inclined surface 36, and onto the shelf surface 30a of the shelf section 30, while maintaining a higher potential energy and ensuring a larger flow rate compared to the cleaning water in the second rim water channel 24. Therefore, by directing the flushing water in the first rim water channel 22 from the first rim outlet 26 through the inclined surface 36 and onto the shelf surface 30a of the shelf section 30, it can be effectively guided into the bowl section 4, thereby effectively improving the toilet flushing performance.
[0035] In the flush toilet 1 according to the embodiment described above, a flush toilet that performs flushing (100% flushing with rim water) is described using only flushing water (rim water) supplied from the first rim water outlet 26 and the second rim water outlet 28, which are provided on the rim portion 12. However, this embodiment is also applicable to flush toilets that use a combination of rim water discharge from the rim outlet and other types of flushing water discharge (for example, jet water discharge). [Explanation of Symbols]
[0036] 1 flush toilet 2 Toilet bowl 4 Bowl section 6. Water storage tank (water source for washing) 6a Drain 8 Leading waterway 8a opening 8b Downstream end of the main channel, branching point 10 Waste receiving surface 12 Rim section 14 Water surface 14a Front end of the reservoir surface 14b Rear end of the reservoir surface 16. Jar section 18 Drain trap section 18a Inlet of the drain trap 18b Drainage line 20 Drain valve 22. First Rim Waterway 22a Downstream end of the first rim channel, downstream end of the bottom surface of the first rim channel 22b Bottom surface of the first rim water channel 22c Inlet of the first rim conduit (upstream end of the first rim conduit) 22d The bottom surface on the upstream side of the first maximum height position on the bottom surface of the first rim water channel 24. Second Rim Waterway 24a Inlet of the second rim conduit (upstream end of the second rim conduit) 24b Bottom surface of the second rim water conduit 26. First rim outlet (rim outlet section, first rim outlet section) 26a Bottom surface of the first rim outlet 28. Second rim outlet (rim outlet section, second rim outlet section) 30 Shelf 30a shelf surface 32 Inner side of rim 32a End of the inner surface of the rim 34 Connection between the downstream end of the first rim water channel and the end of the inner surface of the rim 34a Lower end of the connection between the downstream end of the first rim water channel and the end of the inner surface of the rim 36 Slope 36a Upstream connection 36b Downstream connection 100 Conventional flush toilets 104 Bowl Section 108 Leading Channel 122 First Rim Waterway 124 Second Rim Waterway 126 First rim outlet 128 Second rim outlet A. Flow channel section from the first maximum height position on the bottom surface of the first rim water channel to the height position on the bottom surface of the first rim discharge port. C1 Central axis of the flow path of the first rim water conduit C2 Second Rim Waterway Central Axis H1 Height dimension L1 First channel length along the central axis direction of the channel of the first rim channel L2 Second channel length along the central axis direction of the channel of the second rim water conduit P0 The height position of the bottom surface upstream of the first maximum height position on the bottom surface of the first rim water conduit. P1 First maximum height position on the bottom surface of the first rim water conduit. P2 Second maximum height position on the bottom surface of the second rim water channel P3 Height position of the bottom surface of the first rim outlet S1 Cross-section of the flow path of the first rim conduit, formed in a direction perpendicular to the central axis direction of the flow path of the first rim conduit. W1 Width of the downstream connection section on the inclined surface W2 Width of the upstream connection section on the inclined surface F Floor
Claims
1. A flush toilet that discharges waste using flushing water supplied from a flushing water source, A bowl portion including a waste receiving surface for receiving waste and a rim portion formed above the waste receiving surface, A drain trap section is connected to the bottom of the bowl section, with an inlet for discharging waste from the bowl section. A rim water channel is provided in the rim portion and guides the cleaning water supplied from the cleaning water source to the bowl portion side, A rim discharge section including a rim discharge port provided at the downstream end of the rim water channel, It has a shelf section including a shelf surface that guides the cleaning water discharged from the rim outlet into the bowl section, The rim portion described above has an inner surface of the rim at which the end of its inner surface is connected to the downstream end of the rim water channel, The rim outlet is provided at the connection point between the downstream end of the rim water channel and the end of the inner surface of the rim, and the lower end of this connection point is provided above the shelf surface. A flush toilet characterized in that the bottom surface of the rim water channel and the shelf surface are connected by an inclined surface.
2. The flush toilet according to claim 1, wherein the inclined surface is provided downstream of the cross-sectional area of the rim water channel, which is formed in a direction perpendicular to the central axis direction of the flow path of the rim water channel from the lower end of the connection portion in a plan view.
3. The above-mentioned inclined surface comprises an upstream connection portion connected to the downstream end of the bottom surface of the rim water channel, and a downstream connection portion connected to the shelf surface. The flush toilet according to claim 1, wherein the width of the downstream connection portion on the inclined surface is set to be greater than the width of the upstream connection portion.
4. The above-mentioned rim water channel comprises a first rim water channel and a second rim water channel. The rim discharge section comprises a first rim discharge section including a first rim discharge port provided at the downstream end of the first rim water channel, and a second rim discharge section including a second rim discharge port provided at the downstream end of the second rim water channel. The second rim outlet is located further back than the first rim outlet. The flush toilet according to claim 1, wherein the first maximum height position of the bottom surface of the first rim water channel is set higher than the second maximum height position of the bottom surface of the second rim water channel.
5. Furthermore, it has a main channel provided upstream of the first rim channel and the second rim channel, and this main channel has a branching section at its downstream end that branches off into the first rim channel and the second rim channel, respectively. The flush toilet according to claim 4, wherein the first maximum height position on the bottom surface of the first rim water channel is located on the branching portion side of the first rim water outlet.
6. The flush toilet according to claim 4, wherein the bottom surface of the first rim water channel is set to a height position approximately the same as the first maximum height position over the flow channel section from the upstream side to the first rim water outlet.
7. The flush toilet according to claim 4, wherein the length of the first channel of the first rim water channel along the direction of the central axis of the channel is set to be longer than the length of the second channel of the second rim water channel along the direction of the central axis of the channel.