JP7393727B2 - flush toilet - Google Patents

Description

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 and discharges waste.

Conventionally, flush toilets that are flushed and discharged with flush water supplied from a flush water source have been used, for example, as described in Patent Document 1, which sprays flush water onto a shelf of a bowl. The rim spout of the rim water passage that forms a swirling flow is formed in the front area of the bowl part, and only a part of the inner circumferential surface of the rim part overflows inward in the water passage immediately after the rim water spout. One that is formed in a hanging shape is known.

Further, as described in Patent Document 2, regarding a flush toilet in which the vertical dimension of the rim passageway formed at the upper edge of the bowl part is set to gradually decrease toward the downstream side, is also known.

Japanese Patent Application Publication No. 2013-44177 Patent No. 5483314 (Japanese Unexamined Patent Publication No. 2011-12508)

However, in the conventional flush toilets described in these above-mentioned Patent Documents 1 and 2, the cross-sectional area of the water passage formed on the downstream side of the rim spout is on the downstream side from the rim spout. Therefore, if the height of the water flow cross section on the downstream side of the rim spout is set to be larger toward the downstream side, the height of the flow channel on the downstream side of the rim spout There is a problem in that there is a risk that the water discharged from the rim passing through the water passage section may be disturbed, and that the washing water may be splashed.
Further, there is a problem in that the larger the area of the overhang portion that covers the water passage on the downstream side of the rim spout, the lower the visibility and cleanability of the water passage on the downstream side of the rim water spout.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art described above, and is capable of preventing the washing water spouted from the rim spout from splashing, and also prevents the washing water from splashing downstream of the rim spout. The purpose of the present invention is to provide a flush toilet that can effectively improve the visibility and cleaning performance of side water passages.

In order to achieve the above-mentioned object, the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source and discharges filth, comprising a bowl-shaped filth receiving surface and a bowl-shaped filth receiving surface; a rim portion formed on the edge; a drainage channel connected to the lower part of the bowl portion for discharging dirt; The bowl part has a rim water spouting part that forms a flow, and a water conduit that supplies wash water supplied from the washing water source to the rim water spouting part, and the bowl part divides the bowl part into two in the front and back direction. The rim water spouting section includes a front side area that is the front side and a rear side area that is the rear side with respect to the center line extending in the left-right direction, and the rim water spouting part is located in either the left or right side in the front side area of the bowl part. A rim water passage is formed in the side rim portion through which the cleaning water supplied from the water conduit passes, and a rim water spout is formed at the downstream end of the rim water passage to discharge the cleaning water toward the rear. , the water passage formed on the downstream side of the rim spout includes an inner circumferential surface of the rim portion, a shelf surface formed on the lower side of the inner circumferential surface of the rim portion, and an upper side of the inner circumferential surface. A cross section of the flow path is formed by an overhang portion formed in the rim, and the cross section of the flow path is such that the cross-sectional area of the cross section of the flow path becomes approximately constant from the rim spout toward the downstream side. , is characterized in that its height is set larger toward the downstream side, and its width is set smaller toward the downstream side.
In the present invention configured in this way, the water passage formed on the downstream side of the rim spout is connected to the inner circumferential surface of the rim portion, the shelf surface formed on the lower side of the inner circumferential surface of this rim portion, and , an overhang formed on the upper side of the inner circumferential surface of the rim portion forms a flow passage cross section, and the cross-sectional area of the flow passage cross section becomes approximately constant from the rim water outlet toward the downstream side. As shown in FIG. The rim discharge water that passes through the cross-section of the water passage on the downstream side is suppressed from being disturbed and can flow downstream along the water passage, effectively creating a stable swirling flow within the bowl on the downstream side. can be formed into
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout along the water passage on the downstream side, it is possible to prevent the washing water from scattering, making it possible to visually check the bowl part. It is possible to effectively improve performance and cleanability.
Note that "the cross-sectional area is approximately constant" here does not mean that it is completely constant, but also means that the rim water that passes through the flow path cross section of the water passage on the downstream side of the rim spout after being spouted from the rim spout is It also includes a substantially constant flow that can flow downstream along the water passageway with turbulence suppressed, and can effectively form a stable swirling flow within the bowl portion on the downstream side.

In the present invention, preferably, the shelf surface forming the flow path cross section is formed so that its height position is approximately constant toward the downstream side from the rim spout.
In the present invention configured in this way, the height position of the shelf surface forming the flow passage cross section of the water passage formed on the downstream side of the rim spout is approximately constant from the rim spout to the downstream side. By being formed at a height position, the rim water spouted from the rim spout and passing through the cross-section of the water passage on the downstream side of the rim spout is suppressed from being disturbed. It can flow downstream along the water channel, and a stable swirling flow can be more effectively formed on the downstream side.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout along the water passage on the downstream side, it is possible to prevent the washing water from scattering, making it possible to visually check the bowl part. This makes it possible to more effectively improve performance and cleanability.
Note that the "approximately constant height position" here refers not only to a completely constant height position, but also to the rim water discharged from the rim spout and passing through the flow path cross section of the water passage on the downstream side of the rim spout. However, it also includes a substantially constant state in which the flow is suppressed from being turbulent and can flow downstream along the water passageway, effectively forming a stable swirling flow within the bowl portion on the downstream side.

In the present invention, preferably, the overhang portion forming the flow path cross section is formed at a substantially constant height position toward the downstream side from the rim spout.
In the present invention configured in this way, the height position of the overhang part forming the flow passage cross section of the water passage formed downstream of the rim spout is substantially constant from the rim spout to the downstream side. By being formed at a height of , the rim water discharged from the rim spout and then passing through the cross section of the water passage on the downstream side of the rim spout is prevented from being disturbed. It can flow downstream along the inside of the water passage, and a stable swirling flow can be more effectively formed on the downstream side.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout along the water passage on the downstream side, it is possible to prevent the washing water from scattering, making it possible to visually check the bowl part. This makes it possible to more effectively improve performance and cleanability.
Note that the "approximately constant height position" here refers not only to a completely constant height position, but also to the rim water discharged from the rim spout and passing through the flow path cross section of the water passage on the downstream side of the rim spout. However, it also includes a substantially constant state in which the flow is suppressed from turbulence and can flow downstream along the water passageway, effectively forming a stable swirling flow within the bowl portion on the downstream side.

In the present invention, preferably, the ratio (U: L) is set to 1:6 to 6:1.
In the present invention configured in this way, the minimum height dimension (U) of the overhang part in the flow passage cross section of the water passage formed on the downstream side of the rim spout, and the distance from the shelf surface to the lower end of the overhang part are By setting the ratio (U:L) to the maximum height dimension (L) of The rim discharge water that passes through the cross section of the waterway is suppressed from being disturbed and can flow downstream along the waterway, making it possible to more effectively form a stable swirling flow on the downstream side. .
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout along the water passage on the downstream side, it is possible to prevent the washing water from scattering, making it possible to visually check the bowl part. The performance and cleanability can be further improved effectively.

In the present invention, preferably, the rim spout has a triangular opening cross section, and one side of the triangular rim spout forms the overhang portion.
In the present invention configured in this way, the cross section of the opening of the rim spout is formed in a triangular shape, and one side of the triangular rim spout forms an overhang part, so that, for example, the opening The area of the overhang portion can be made smaller than that of a rim spout having a rectangular cross section and having the same width as the opening cross section of the triangular rim spout.
Therefore, after water is discharged from the rim spout, the rim water that passes through the cross section of the water passage on the downstream side of the rim spout is prevented from being disturbed and can flow downstream along the water passage. , a stable swirling flow can be formed even more effectively on the downstream side.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout along the water passage on the downstream side, it is possible to prevent the washing water from scattering, making it possible to visually check the bowl part. The performance and cleanability can be further improved effectively.

According to the flush toilet of the present invention, it is possible to prevent the flushing water spouted from the rim spout from splashing, and it is also possible to effectively improve the visibility and cleaning of the water passage downstream of the rim spout. can be increased to

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a flush toilet according to a first embodiment of the present invention, with the toilet lid and seat rotated to an upper position. FIG. 2 is a cross-sectional view of the horizontal center cross section of the flush toilet according to the first embodiment of the present invention, viewed from the left side, showing a state in which the toilet lid and the toilet seat are rotated to a lower position. FIG. 2 is a partial plan view showing the toilet main body portion of the flush toilet according to the first embodiment of the present invention shown in FIG. 1; FIG. 4 is a partially enlarged plan view showing a rim passageway formed inside the rim portion of the flush toilet main body portion of the flush toilet according to the first embodiment of the present invention shown in FIG. 3; FIG. 5 is a partially enlarged cross-sectional view of the rim portion taken along line VV in FIG. 4; 5 is a section A of the rim water passage shown in FIG. 4. 5 is a cross section B of the rim water passage shown in FIG. 4. 5 is a cross section C of the rim water passage shown in FIG. 4. 5 is a cross section D of the rim water passage shown in FIG. 4. 5 is a cross section E of the rim water passage shown in FIG. 4. This is a partially enlarged side surface portion of the water passage near the downstream side of the rim spout in the flush toilet according to the first embodiment of the present invention shown in FIG. 2 . 8 is a sectional view taken along line VIII-VII in FIG. 7. FIG. 8 is a sectional view taken along line XI-XI in FIG. 7. FIG. Relationship between the distance (x) on the downstream side in the circumferential direction from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to the first embodiment of the present invention and the height dimension (U) of the overhang part FIG. Distance (x) from the rim spout to the downstream side in the circumferential direction in the water passage near the downstream side of the rim spout of the flush toilet according to the first embodiment of the present invention and the maximum height from the shelf surface to the lower end of the overhang part It is a diagram qualitatively showing the relationship with the dimension (L). The distance (x) from the rim spout to the downstream side in the circumferential direction in the water passage near the downstream side of the rim spout of the flush toilet according to the first embodiment of the present invention and the width (W) of the water passage downstream of the rim spout ) is a diagram qualitatively showing the relationship between 4 is a sectional view taken along the line XI-XI in FIG. 3. FIG. 4 is a sectional view taken along line XII-XII in FIG. 3. FIG. In the flush toilet according to the first embodiment of the present invention, the distance (x) on the downstream side in the circumferential direction from the rim spout and the curvature (1/ρ ) is a diagram qualitatively showing changes in This is a comparative example with respect to the flush toilet according to the first embodiment of the present invention shown in FIG. 13A, and the downstream side in the circumferential direction from the rim spout when the straight part and the bent part of the bowl part are connected by a curve tangential to the straight line. FIG. 2 is a diagram qualitatively showing changes in distance (x) and curvature (1/ρ). FIG. 9 is a sectional view similar to FIG. 8 of the water passage downstream of the rim spout of the flush toilet according to the second embodiment of the present invention. FIG. 10 is a sectional view similar to FIG. 9 of the water passage downstream of the rim spout of the flush toilet according to the second embodiment of the present invention. Relationship between the distance (x) on the downstream side in the circumferential direction from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to the second embodiment of the present invention and the height dimension (U) of the overhang part FIG. Distance (x) from the rim spout to the downstream side in the circumferential direction in the water passage near the downstream side of the rim spout of the flush toilet according to the second embodiment of the present invention and the maximum height from the shelf surface to the lower end of the overhang part It is a diagram qualitatively showing the relationship with the dimension (L). The distance (x) from the rim spout to the downstream side in the circumferential direction in the water passage near the downstream side of the rim spout of the flush toilet according to the second embodiment of the present invention and the width (W) of the water passage downstream of the rim spout ) is a diagram qualitatively showing the relationship between FIG. 7 is a schematic cross-sectional view schematically showing a cross-sectional portion near the rim spout (a cross-sectional portion of the rim spout and the passageway on the downstream side thereof) in a flush toilet according to a third embodiment of the present invention.

Next, a flush toilet according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 13.
First, FIG. 1 is a perspective view showing a flush toilet according to a first embodiment of the present invention, showing a state in which the toilet lid and the toilet seat are rotated to an upper position. Moreover, FIG. 2 is a cross-sectional view of the horizontal center cross section of the flush toilet according to the first embodiment of the present invention, viewed from the left side, and shows a state in which the toilet lid and the toilet seat are rotated to the lower position. Furthermore, FIG. 3 is a partial plan view showing the toilet main body portion of the flush toilet according to the first embodiment of the present invention shown in FIG.

As shown in FIGS. 1 to 3, the flush toilet 1 according to the first embodiment of the present invention includes a toilet bowl body 2 made of ceramic, and a toilet seat arranged on the top surface of the toilet bowl body 2 so as to be rotatable in the vertical direction. 4, a toilet lid 6 arranged to be rotatable in the vertical direction so as to cover the toilet seat 4, and a functional part 8 arranged at the rear of the toilet main body 2.
Further, as shown in FIG. 2, the functional section 8 includes a sanitary cleaning system functional section 10 that is disposed at the rear upper part of the toilet main body 2 and functions as a sanitary cleaning section for cleaning the private parts of the user, and a sanitary cleaning system A water supply system function section 12 is provided which is disposed close to the function section 10 and is involved in the water supply function to the toilet main body 2.

Next, as shown in FIGS. 1 to 3, the toilet main body 2 includes a bowl-shaped waste receiving surface 14 and a rim portion 18 formed to rise from the shelf surface 16 at the upper edge of this waste receiving surface 14. The bowl part 20 is provided with a bowl part 20.
Further, as shown in FIG. 2, the toilet main body 2 includes a drain trap pipe 22, which is a drainage channel for discharging waste in the bowl part 20, with an inlet part 22a connected to the lower part of the bowl part 20. .

Next, as shown in FIG. 3, the bowl portion 20 has a front side region F1 on the front side and a rear side region R1 on the rear side with respect to a center line C1 extending in the left-right direction that bisects the bowl part 20 in the front-back direction. The rim part 18 on one of the left and right sides in the front area F1 of the bowl part 20, that is, the right rim part 18 in the front area F1 of the bowl part 20 when viewed from the front of the toilet main body 2. A rim water passage 24 (details will be described later), which is a part of the rim water discharge part, is formed inside the rim.
Further, a rim water spout 26 (details will be described later), which is a part of the rim water spout, is formed at the downstream end of the rim water passage 24.
Furthermore, as shown in FIG. 3, the upstream side of the rim water passage 24 is connected to a water conduit 28 that is a water conduit that supplies wash water supplied from a water supply (not shown) that is a washing water source to the rim water passage 24. It is connected. The upstream side of this water conduit 28 is directly connected to a water supply (not shown) which is a source of cleaning water, and the cleaning water is supplied from the water conduit 28 into the rim passageway 24 using the water supply pressure of this water supply. is guided forward within the rim passageway 24, then bent inward and rearward, and guided to the rim spout 26 on the downstream side.
The cleaning water guided to the rim spout 26 is spouted rearward (rim water spout) and passes through a water passage 30 (details will be described later) formed near the downstream side of the rim spout 26 to the bowl portion. By swirling within the bowl portion 20, a swirling flow is formed within the bowl portion 20.
Note that the rim water spout 26 is the only water spout provided in the rim portion 18 that spouts cleaning water to form a swirling flow inside the bowl portion 20 .

In the flush toilet 1 of the present embodiment, the rim water passage 24 and the rim spout 26, which are the rim water spout, are located on the right rim in the front area F1 of the bowl portion 20 when viewed from the front of the toilet main body 2. A description will be given of a form in which the rim spout is disposed inside the bowl part 18, but the present invention is not limited to this form. Alternatively, the rim may be arranged so that water is spouted toward the rear.
In short, the rim water passage and the rim water spout, which are the rim water spouting portion, are arranged on either the left or right rim portion 18 in the front area F1 of the bowl portion 20 to discharge rim water toward the rear. Any form is fine.
Further, in the flush toilet 1 of the present embodiment, the rim water passage 24 and the rim water spout 26, which are the rim water spouting portion, are integrally formed in the toilet main body 2 by processing ceramics. It may be formed as a separate body from the toilet bowl main body 2 and attached to the toilet bowl main body 2.

Further, as shown in FIG. 2, a jet spout 32 is formed at the bottom of the bowl portion 20 so as to be directed toward the inlet portion 22a of the drain trap conduit 22. Regarding the water spouting (jet water spouting) from the jet water spout 32, the cleaning water stored in the water storage tank 34 provided in the water supply system function section 12 is pressurized by the pressure pump 36 of the water supply system function section 12. , is discharged from the jet water spout 32.
Further, the cleaning water discharged from the jet spout 32 flows from the inlet 22a of the drain trap pipe 22 into the ascending pipe 22b on the rear side of the inlet 22a, and then flows through the ascending pipe 22b. The water flows out from the top 22c of the drain trap pipe 22 to the descending pipe 22d.

Here, since the specific structures of each of the sanitary cleaning system functional section 10 and the water supply system functional section 12 are the same as those of the conventional ones, a detailed explanation will be omitted. is provided with a private part washing device (not shown) including a nozzle device (not shown) that sprays washing water toward the user above the bowl portion 20.
In addition, the sanitary cleaning system functional unit 10 includes a water storage section (not shown) that stores washing water to be supplied to the private parts washing device (not shown), and a water storage section (not shown) that stores the washing water in this water storage section (not shown) at an appropriate temperature. A heater (not shown) that warms the water to hot water, a ventilation fan (not shown), a deodorizing fan (not shown), a hot air fan (not shown), and a controller that controls the operation of these devices. (not shown) etc. are provided.
On the other hand, the water supply channel (not shown) of the water supply system functional unit 12 is connected at its upstream side to a water supply (not shown) that is a water supply source, and is connected to the water supply channel on the upstream side of the water storage tank (not shown). is equipped with a constant flow valve (not shown), a solenoid valve (not shown), a switching valve (not shown) that switches between supplying water to a water storage tank (not shown) and discharging water to the rim spout 26. It is being In addition to these functions, the water supply system functional unit 12 also has functions such as opening and closing operations of a solenoid valve (not shown), switching operation of a switching valve (not shown), and rotation speed of a pressure pump (not shown). A controller (not shown) and the like are provided to control the operating time and the like.

In the flush toilet 1 according to the present embodiment, the rim water spouting from the rim spout 26 is performed using the water supply pressure of the tap water, and the jet water spouting from the jet spout 32 is controlled by a pressurizing pump (not shown). Although the embodiment of a so-called hybrid flush toilet that supplies flush water from a water storage tank (not shown) will be described, it is not limited to this embodiment, and other embodiments are also applicable. That is, as another form, for cleaning water directly supplied only from the water supply, a form may be adopted in which the rim water spouting from the rim water spout 26 and the jet water spouting from the jet water spout 32 are switched by switching the valve. Alternatively, the cleaning water in the water storage tank may be switched between rim water spouting from the rim water spout 26 and jet water spouting from the jet water spout 32 by switching only the pump.

Next, details of the rim passageway 24 and the rim spout 26 of the flush toilet 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 7.
FIG. 4 is a partially enlarged plan view showing a rim passageway formed inside the rim portion of the flush toilet main body portion of the flush toilet according to the first embodiment of the present invention shown in FIG. 5 is a partially enlarged cross-sectional view of the rim portion taken along line VV in FIG. 4. FIG.
6A is a section A of the rim water passage shown in FIG. 4, and FIG. 6B is a cross section B of the rim water passage shown in FIG. 4. Furthermore, FIG. 6C is a C section of the rim water passage shown in FIG. 4, and FIG. 6D is a D cross section of the rim water passage shown in FIG. 4. FIG. 6E is a cross section E of the rim water passage shown in FIG. 4.

First, as shown in FIG. 4, the rim water passage 24 includes an outer portion 24b extending forward inside the rim portion 18 from an inlet portion 24a connected to the water conduit 28, and a downstream end of the outer portion 24b. It includes a bent portion 24c that bends inward, and an inner portion 24d that extends rearward from the bent portion 24c to the rim spout 26.

In addition, as shown in FIGS. 5 and 6A to 6E, the maximum height H of the cross section of the outer part 24b and the bent part 24c of the rim water passage 24 is set, and the cross section of the inner part 24d of the rim water passage 24 is the maximum height H. Assuming that h is the maximum height of each passage cross section E of the inner part 24d of the rim passageway 24, the maximum height h1 of each passage cross section E of the inner part 24d of the rim passageway 24 is the maximum height of each passage cross section A to C of the outer part 24b of the rim passageway 24. It is set to be smaller than the height dimensions H1 to H3 and the maximum height dimension H4 of the channel cross section D of the bent portion 24c.
In the flush toilet 1 of the present embodiment, for example, the maximum height h1 of the channel cross section E of the inner side 24d of the rim water passage 24 and the downstream end (bending portion) of the outer side 24b of the rim water passage 24 are The ratio (h1:H4) of the maximum height dimension H4 of the channel cross section D at the upstream end of 24c is preferably set to 1:2 to 1:8, and 1:2 to 1:5. Most preferably, it is set to .
As a result, for example, in a flush toilet different from the present invention, in order to reduce the frictional resistance of the wall surface in the rim passageway, the cross section of the rim passageway is changed from the upstream end to the downstream end of the rim passageway. Compared to the rim passageway which is formed by a circular cross section that is substantially the same or a cross section that has approximately the same aspect ratio over the entire area, in the flush toilet 1 of this embodiment, the rim passageway 24 that is the rim water spout and the rim water spout are 26, the width and other dimensions of the entire rim portion 18 can be effectively set small.
Therefore, the air space other than the cleaning water in the rim water passage 24 during water flow can be reduced, and the rim water spout 26 can efficiently discharge water from the rim.
Further, it is possible to make it difficult to generate abnormal noise due to air being drawn into the rim water passageway 24 during water flow.
Furthermore, by reducing the volume space within the entire rim water passage 24, a space around the rim water passage 24, which is bent from the outer part 24b of the rim water passage 24 to the inner part 24d via the bending part 24c, can be made more spacious. Therefore, the pressure loss of the flushing water in the rim passageway 24 can be suppressed, and flexibility in toilet design regarding the shape of the rim portion 18 of the bowl portion 20, etc. can be ensured. .

Next, as shown in FIG. 5, the outer part 24b of the rim water passage 24 includes an outer wall part 38 on the outer peripheral side of the rim part 18, and a lower wall integrally formed inward from the lower end of this outer wall part 38. 40, an inner wall 42 which faces the outer wall 38 in the horizontal direction and whose lower end is bonded to the upper end of the lower wall 40; The upper wall portion 44 is bonded to the upper end of the portion 38.
Further, the adhesive surface S1 between the upper end surface of the lower wall portion 40 of the outer portion 24b of the rim water passage 24 and the lower end surface of the inner wall portion 42 forms a substantially horizontal surface, and the upper end surface of the outer wall portion 38 The adhesive surface S2 with the side wall portion 44 forms an inclined surface inclined with respect to a substantially horizontal surface.
Note that the term "substantially horizontal plane" here refers not only to a completely horizontal plane, but also to the fact that the upper end surface (adhesive surface) of the lower wall 40 and the lower end surface (adhesive surface) of the inner wall 42 are shifted from each other in the horizontal direction. It also includes approximately horizontal surfaces that can be
As a result, for example, when manufacturing the flush toilet 1 of the present embodiment, the adhesive surface S1 at the lower end of the inner wall portion 42 is bonded to the adhesive surface S1 at the upper end of the lower wall portion 40 of the rim passageway 24, and at the same time, When bonding the bonding surface S2 of the upper wall 44 to the bonding surface S2 of the upper end of the outer wall 38 of the rim water passage 24, the bonding surface S1 of the lower wall 40 and the bonding surface of the inner wall 42 form a horizontal surface. Even if S1 and S1 are horizontally shifted from each other due to manufacturing errors, the bonding surface S1 of the outer wall portion 38 and the bonding surface S1 of the upper wall portion 44, which form inclined surfaces mutually inclined with respect to the horizontal plane, , making it possible to make reliable contact in advance.
Therefore, the flow path cross sections A to E from the outer part 24b to the inner part 24d in the rim water passage 24 are completely crushed due to the mutual displacement of the bonding surface S1 of the lower wall 40 and the bonding surface S1 of the inner wall 42. Since it is possible to prevent the water from being put away, it is possible to secure the water flow area of the rim water passage 24 over the entire area.

Next, with reference to FIGS. 4 and 7 to 10C, details of the water passage 30 formed near the downstream side of the rim spout 26 of the flush toilet 1 according to the first embodiment of the present invention will be described.
FIG. 7 is a partially enlarged side view of the water passage near the downstream side of the rim spout in the flush toilet according to the first embodiment of the present invention shown in FIG. 9 is a cross-sectional view taken along line VIII-VII, and FIG. 9 is a cross-sectional view taken along line XI-XI in FIG. 7.
Further, FIG. 10A shows the distance (x) from the rim spout to the downstream side in the circumferential direction and the height dimension of the overhang portion in the water passage near the downstream side of the rim spout of the flush toilet according to the first embodiment of the present invention. (U), and FIG. 10B is a diagram qualitatively showing the relationship between 10C is a diagram qualitatively showing the relationship between the side distance (x) and the maximum height dimension (L) from the shelf surface to the lower end of the overhang part, and FIG. Qualitatively shows the relationship between the distance (x) from the rim spout on the downstream side in the circumferential direction in the water passage near the downstream side of the rim spout of the toilet and the width (W) of the water passage on the downstream side of the rim spout. This is a diagram.

First, as shown in FIGS. 7 to 9, a water passageway is formed from the downstream end of the rim spout 26 to the bent portion 50 of the bowl portion 20 (details will be described later), that is, near the downstream side of the rim spout 26. 30 includes an inner circumferential surface 46 of the rim portion 18, a shelf surface 16 formed on the lower side of the inner circumferential surface 46 of the rim portion 18, and an overhang portion 48 formed on the upper side of the inner circumferential surface 46. A flow path cross section G is formed.
In addition, an overhang shape is formed only in the water passage 30 within the entire circumference of the rim part 18, and the inner peripheral surface of the rim part 18 excluding the water passage 30 has a straight line in the vertical direction in a cross section cut in the vertical direction. The overhang portion 48 is formed so as to extend over a length of 100 mm, and does not have an overhang shape like the overhang portion 48.
Further, as shown in FIGS. 4 and 7 to 10C, the water passageway 30 is constructed such that the cross-sectional area A0 of the flow passage cross-section G becomes approximately constant from the rim spout 26 toward the downstream side. The maximum height L is set to be larger toward the downstream side, and the width W thereof is set to be smaller toward the downstream side.
That is, for example, regarding the minimum vertical thickness U2 of the overhang portion 48 of the water passage 30 shown in FIG. 9, the vertical minimum thickness U2 of the overhang part 48 of the water passage 30 shown in FIG. It is smaller than the minimum thickness U1 of the overhang portion 48 in the vertical direction.

Further, regarding the maximum height L2 in the vertical direction of the water passage 30 in the flow passage cross section G2 shown in FIG. It is larger than the maximum vertical height dimension L1 of the channel cross section G1.
Here, "the cross-sectional area A0 is almost constant" does not mean that the cross-sectional area A0 is completely constant, but also means that water passes through the flow path cross section G of the water passage 30 downstream of the rim spout 26 after being spouted from the rim spout 26. The rim discharge water can flow downstream along the water passage 30 with turbulence being suppressed, and can effectively form a stable swirling flow within the bowl portion 20 on the downstream side, including approximately constant flow. It is something that
Furthermore, the width W2 of the water passageway 30 with the flow passage cross section G2 shown in FIG. 9 is set such that the cross-sectional area A0 of the flow passage cross section G is constant. It is smaller than the width W1 of 30.
Furthermore, as shown in FIGS. 8 and 9, the height position P1 of the shelf surface 16 forming the flow passage cross section G of the water passageway 30 is at a substantially constant height position toward the downstream side from the rim spout 26. It is formed to be.
Here, the "almost constant height position" does not mean that the height is completely constant, but also that the water passes through the flow path cross section G of the water passage 30 downstream of the rim spout 26 after water is spouted from the rim spout 26. The rim discharge water can flow downstream along the water passage 30 while being suppressed from being disturbed, and can effectively form a stable swirling flow within the bowl portion 20 on the downstream side. It includes.

As a result, the rim water discharged from the rim spout 26 and passing through the channel cross section G of the water passage 30 is suppressed from being disturbed and can flow downstream along the interior of the water passage 30. A stable swirling flow can be effectively formed within the side bowl portion 20.
Furthermore, by forming a stable flow downstream of the washing water spouted from the rim spout 26 along the water passage 30 on the downstream side, it is possible to prevent the washing water from scattering. The visibility and cleanability of the 20 can be effectively improved.

As shown in FIGS. 8 and 9, the minimum vertical thickness U of the overhang part 48, which is the minimum height dimension of the overhang part 48 in the channel cross section G of the water passage 30, and the It is preferable that the ratio (U:L) to the vertical maximum height dimension L of the water passage 30, which is the maximum height dimension up to the lower end of the hang part 48, is set to 1:6 to 6:1. Most preferably, the ratio is set to 1:3 to 3:1.

Further, as shown in FIG. 3, the inner circumferential wall of the rim portion 18, which is formed in the rear right region in the bowl portion 20 and on the downstream side of the water passage 30, extends toward the downstream side in the circumferential direction from the rim spout 26. A curved portion 50 is formed in which the curvature (1/ρ) changes from small to large according to the distance (x) (in other words, the radius of curvature ρ changes from large to small). That is, in the curved portion 50, the curvature (1/ρ) changes from small to large at a constant rate in a plan view shown in FIG. 3 (in other words, the radius of curvature ρ changes from large to small at a constant rate). ) It is formed by a relaxation curve 52 such as a clothoid curve.
Similarly, as shown in FIG. 3, the inner circumferential wall of the rim portion 18 in the front region within the bowl portion 20 also varies depending on the distance (x) from the rim spout 26 toward the circumferential downstream side. A curved portion 54 is formed in which the curvature (1/ρ) changes from small to large (in other words, the radius of curvature ρ changes from large to small) from the left rear side to the front. This curved portion 54 is a clothoid whose curvature (1/ρ) changes from small to large at a constant ratio in plan view shown in FIG. 3 (in other words, the radius of curvature ρ changes from large to small at a constant ratio). It is formed by a transition curve 56 such as a curved line.
As a result, when the cleaning water spouted from the rim spout 26 first turns along the curved portion 50, it is possible to effectively suppress the occurrence of a sudden change in centrifugal force on the cleaning water. This makes it possible to improve the cleaning efficiency inside the bowl part 20.
Further, the cleaning water that has swirled along the curved portion 50 passes through the rear region in the bowl portion 20 along the inner circumferential wall of the rim portion 18 and swirled downstream in the circumferential direction, and then flows along the curved portion 54. To effectively suppress the generation of a sudden change in centrifugal force on the washing water when turning around this curved part 54, although the washing water is designed to turn in the front side area within the bowl part 20. This makes it possible to improve the cleaning efficiency inside the bowl part 20.
In addition, in the flush toilet 1 of this embodiment, a clothoid curve in which the curvature changes at a constant ratio is adopted for each relaxation curve 52, 56 of each curved part 50, 54 formed by the inner peripheral wall of the rim part 18. An example will be described below, but a sine half-wavelength reduction curve or the like, which is a relaxation curve other than a clothoid curve, may be adopted as the relaxation curve.

Next, with reference to FIG. 3 and FIGS. 11 to 13B, curved portions 50 and 54 formed by transition curves 52 and 56 in a plan view of the bowl portion 20 of the flush toilet 1 according to the first embodiment of the present invention will be described. The details will be explained below.
Here, FIG. 11 is a sectional view taken along line XI-XI in FIG. 3, and FIG. 12 is a sectional view taken along line XII-XII in FIG.
Further, FIG. 13A shows the distance (x) on the downstream side in the circumferential direction from the rim spout when the straight part and the curved part of the bowl part are connected by a transition curve in the flush toilet according to the first embodiment of the present invention. FIG. 13B is a comparative example for the flush toilet according to the first embodiment of the present invention shown in FIG. 13A, in which the linear part of the bowl part and FIG. 7 is a diagram qualitatively showing changes in distance (x) and curvature (1/ρ) on the downstream side in the circumferential direction from the rim spout when the curved portion is connected by a curve tangential to a straight line.

First, as shown in FIG. 3, FIG. 11, and FIG. is substantially constant along the circumferential direction of the bowl portion 20.
Note that "approximately constant" here does not mean that it is completely constant, but also when the cleaning water spouted from the rim water outlet 26 of the rim water passage 24 swirls along the shelf surface 16 of the bent portions 50, 54. Furthermore, it also includes a roughly constant force that can more effectively suppress the occurrence of sudden changes in centrifugal force with respect to the washing water.
Further, as shown in FIGS. 11 and 12, the shelf surfaces 16 of the curved portions 50 and 54 formed by the respective transition curves 52 and 56 of the bowl portion 20 have inclination angles α1 and α2, respectively, with respect to the horizontal plane. It is formed.
Here, the magnitude of the inclination angle α1 is preferably set to 0° to 15°, and most preferably set to 2° to 8°.
Further, the magnitude of the inclination angle α2 is set larger than the magnitude of the inclination angle α1, and is preferably set to 3° to 60°, most preferably set to 5° to 30°. .
As a result, when the washing water spouted from the rim spout 26 turns along the shelf surface 16 of the bending portions 50 and 54, a sudden change in centrifugal force occurs on the washing water more effectively. Therefore, the cleaning efficiency inside the bowl portion 20 can be further improved.

Further, as shown in FIG. 13A, in the flush toilet 1 of this embodiment, when the substantially straight straight part and the curved part of the bowl part 20 are connected by a gradual curve, the water from the rim spout 26 is In the section where the distance x on the downstream side in the circumferential direction is from 0 to mm]), which is a section forming a straight section that is substantially straight.
Next, as shown in FIG. 13A, in the section where the distance x is from x1 to x2 (for example, x2 = 200 mm), the curvature 1/ρ is from a to b (for example, ρ1 = 800 mm, a = 1/ρ1 = 0 .00125, ρ2 = 150 mm, b = 1/ρ2 = 0.00667 [1/mm]) This is a section in which a curve is formed by a transition curve that changes at a constant rate (transition curve section).
Further, as shown in FIG. 13A, in the section where the distance x is from x2 to x3 (for example, x3 = 380 mm), the curvature 1/ρ2 is constant b (for example, ρ2 = 150 mm, b = 1/ρ2 = 0. 00667 [1/mm]), which is a section forming a curved portion with a substantially constant curvature.

On the other hand, as shown in FIG. 13B, in a comparative example where the straight part and the curved part of the bowl part are connected by a curve tangential to the straight line, the curvature 1/ρ is 0 (the curvature Due to the sudden change from radius ρ = ∞) to c (radius of curvature ρ = ρ3), when the cleaning water spouted from the rim spout turns along the shelf surface of the bend, the cleaning water A rapid change in centrifugal force occurs to a greater extent than in the flush toilet 1 of this embodiment, resulting in a decrease in cleaning efficiency within the bowl portion.

Next, the operation of the flush toilet 1 according to the first embodiment of the present invention described above will be explained.
First, according to the flush toilet 1 according to the first embodiment of the present invention, the water passage 30 formed in the vicinity of the downstream side of the rim spout 26 is connected to the inner circumferential surface 46 of the rim portion 18 and the inside of the rim portion 18. The shelf surface 16 formed on the lower side of the circumferential surface 46 and the overhang part 48 formed on the upper side of the inner circumferential surface 46 of the rim part 18 form a channel cross section G, and this water passage 30 The maximum height dimension L of the flow path cross section G is set to be larger toward the downstream side so that the cross-sectional area A0 of the flow path cross section G becomes substantially constant toward the downstream side from the rim spout 26, and the flow path cross section Since the width W of G is set to be smaller toward the downstream side, the rim water discharged from the rim water spout 26 and passing through the channel cross section G of the water passage 30 on the downstream side of the rim water spout 26 becomes turbulent. This allows the fluid to flow downstream along the water passageway 30, thereby effectively forming a stable swirling flow within the bowl portion 20 on the downstream side.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout 26 along the water passage 30 on the downstream side, it is possible to prevent the washing water from scattering. 20 can be effectively improved in visibility and cleanability.

Next, according to the flush toilet 1 according to the present embodiment, the height position P1 of the shelf surface 16 forming the flow passage cross section G of the water passage 30 formed on the downstream side of the rim spout 26 is 26 toward the downstream side, the flow path cross section G of the water passage 30 on the downstream side of the rim spout 26 after water is spouted from the rim spout 26 The rim discharged water passing through can flow downstream along the water passage 30 without being disturbed, and a stable swirling flow can be more effectively formed downstream.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout 26 along the water passage 30 on the downstream side, splashing of the washing water can be prevented. The visibility and cleanability of 20 can be more effectively improved.

Further, according to the flush toilet 1 according to the present embodiment, the minimum height dimension U of the overhang part 48 in the flow passage cross section G of the water passage 30 formed on the downstream side of the rim spout 26 and the distance from the shelf surface 16 to By setting the ratio (U:L) to the maximum height dimension L to the lower end of the overhang portion 48 to be 1:2 to 1:8, after water is spouted from the rim spout 26, the rim spout is The rim discharge water passing through the channel cross section G of the water passage 30 on the downstream side of the water port 26 is suppressed from being disturbed and can flow downstream along the water passage 30, creating a stable swirling flow on the downstream side. Furthermore, it can be formed more effectively.
In addition, by forming a stable flow downstream of the washing water spouted from the rim spout 26 along the water passage 30 on the downstream side, splashing of the washing water can be prevented. The visibility and cleanability of 20 can be improved even more effectively.

Next, a flush toilet according to a second embodiment of the present invention will be described with reference to FIGS. 14 to 16C.
FIG. 14 is a sectional view similar to FIG. 8 of the water passage downstream of the rim spout of the flush toilet according to the second embodiment of the present invention, and FIG. FIG. 10 is a sectional view similar to FIG. 9 of the water passage on the downstream side of the rim spout of the toilet bowl.
Further, FIG. 16A shows the distance (x) on the downstream side in the circumferential direction from the rim spout in the water passage near the downstream side of the rim spout of a flush toilet according to the second embodiment of the present invention, and the height dimension of the overhang part. It is a diagram qualitatively showing the relationship with (U).
Furthermore, FIG. 16B shows the distance (x) on the downstream side in the circumferential direction from the rim spout in the passageway near the downstream side of the rim spout of the flush toilet according to the second embodiment of the present invention, and the distance (x) from the shelf surface to the overhang part. It is a diagram qualitatively showing the relationship with the maximum height dimension (L) to the lower end.
Further, FIG. 16C shows the distance (x) on the downstream side in the circumferential direction from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to the second embodiment of the present invention, and the distance (x) on the downstream side of the rim spout It is a diagram qualitatively showing the relationship with the width (W) of the water passage.
Here, in the flush toilet according to the second embodiment of the present invention shown in FIGS. 14 to 16C, the same parts as those of the flush toilet according to the first embodiment of the present invention shown in FIGS. 8 to 10C are the same. Reference numerals are given, and explanations thereof will be omitted.

As shown in FIGS. 14 to 16C, in the flush toilet 100 according to the second embodiment of the present invention, the water passage 130 formed near the downstream side of the rim spout 26 is connected to the inner circumferential surface 146 of the rim portion 118, A channel cross section G is formed by the shelf surface 116 formed on the lower side of the inner circumferential surface 146 of this rim portion 118 and the overhang portion 148 formed on the upper side of the inner circumferential surface 46 .
Further, regarding the water passage 130, the maximum height dimension L of the flow passage cross section G is set to be larger toward the downstream side so that the cross-sectional area A0 of the flow passage cross section G becomes approximately constant from the rim spout 26 toward the downstream side. At the same time, the width W of the channel cross section G is set to be smaller toward the downstream side.
That is, in the flush toilet 100 according to the second embodiment of the present invention, the height position P101 of the overhang portion 148 forming the flow passage cross section G of the water passage 130 near the downstream side of the rim spout 26 is located at the height position P101 of the overhang portion 148 that is located near the downstream side of the rim spout 26. The shelf surface 16 forming the flow passage cross section G of the water passage 30 in the flush toilet 1 according to the first embodiment of the present invention is formed at a substantially constant height position toward the downstream side. This is different from the structure in which the height position P1 is formed at a substantially constant height position toward the downstream side from the rim spout 26.
In addition, the "almost constant height position" here does not mean a completely constant height position, but also a flow path cross section G of the water passage 130 on the downstream side of the rim spout 26 after water is spouted from the rim spout 26. The passing rim discharge water can flow downstream along the passageway 130 with turbulence suppressed, and a stable swirling flow can be effectively formed in the bowl portion on the downstream side, including approximately constant flow. It is something that
Further, as shown in FIGS. 14 to 16C, in the water passage 130 of the flush toilet 100 according to the second embodiment of the present invention, the cross-sectional area A0 of the flow passage cross section G toward the downstream side from the rim spout 26 is The maximum height L of the channel cross section G is set to be larger toward the downstream side, and the width W of the channel cross section G is set to be smaller toward the downstream side so as to be approximately constant.
That is, for example, regarding the vertical minimum thickness U (U101, U102) of the overhang portion 148 of the water passage 130 shown in FIGS. 14 and 15, the cross-sectional area A0 of the flow passage cross section G (G101, G102) is approximately constant. The thickness is set to be approximately constant (U=U101=U102) so that
Further, regarding the maximum vertical height dimension L102 of the water passageway 130 of the flow passage cross section G102 shown in FIG. It is larger than the maximum vertical height dimension L101 of the channel cross section G101.
Further, the width W102 of the water passage 130 of the flow passage cross section G102 shown in FIG. 15 is set such that the cross-sectional area A0 of the flow passage cross section G is constant. It is smaller than the width W101 of 130.

According to the flush toilet 100 according to the second embodiment of the present invention described above, the height position P101 of the overhang portion 148 forming the flow passage cross section G of the water passage 130 formed on the downstream side of the rim spout 26 is , are formed at a constant height position toward the downstream side from the rim spout 26, and the maximum height dimension L of the channel cross section G of the water passageway 130 is set to be larger toward the downstream side, Since the width W of the water passage 130 is set to be smaller toward the downstream side, the rim water discharged from the rim water spout 26 and passing through the channel cross section G of the water passage 130 on the downstream side of the rim water spout 26 is It is possible to flow downstream along the inside of the water passage 130 with turbulence being suppressed, and a stable swirling flow can be more effectively formed on the downstream side.
In addition, by forming a stable flow downstream of the cleaning water spouted from the rim spout 26 along the water passage 130 on the downstream side, splashing of the cleaning water can be prevented. The visibility and cleanability of 20 can be more effectively improved.

Next, with reference to FIG. 17, a flush toilet according to a third embodiment of the present invention will be described.
FIG. 17 is a schematic cross-sectional view schematically showing a cross-sectional portion near the rim spout (a flow path cross-sectional portion of the rim spout and the water passage downstream thereof) in the flush toilet according to the third embodiment of the present invention. be.
Here, in the toilet main body portion of the flush toilet according to the third embodiment of the present invention shown in FIG. 17, the same parts as the toilet main body portion of the flush toilet 1 according to the first embodiment of the present invention are designated by the same reference numerals. These descriptions will be omitted.
In addition, in FIG. 17, as a comparative example for the flush toilet 200 according to the third embodiment of the present invention, the shapes of the rim spout 26 and the overhang portion 48 of the flush toilet 1 according to the first embodiment of the present invention are shown with chain lines. It is shown in

As shown in FIG. 17, in the flush toilet 200 according to the third embodiment of the present invention, the opening cross section E200 of the rim spout 226 is formed in a triangular shape, and the overhang of the triangular rim spout 226 One side of the portion 248 side, the oblique side 226a, forms a part of the overhang portion 248.
As a result, in the rim spout 226 of the flush toilet 200 according to the third embodiment of the present invention, for example, the opening cross section E1 in the flush toilet 1 according to the first embodiment of the present invention shown in FIG. 17 is formed into a rectangular shape. The rim spout 26 according to the third embodiment of the present invention has a width substantially equal to the maximum width of the opening cross section E200 of the triangular rim spout 226 of the flush toilet 200 according to the third embodiment of the present invention. Regarding the region of the overhang part 248 above the water passage 230 on the downstream side of the rim spout 226 of the flush toilet 200 according to The area can be made smaller than the area of the overhang portion 48 above the waterway 30.

According to the flush toilet 200 according to the third embodiment of the present invention described above, since the opening cross section E200 of the rim spout 226 is formed in a triangular shape, the upper part of the water passage 230 on the downstream side of the rim spout 226 is The area of the overhang portion 248 of the rim water spout 226 can be reduced, and the rim water spouted from the rim water spout 226 and passing through the cross section of the water passage 230 on the downstream side of the rim water spout 226 is not disturbed. It can be suppressed and flow downstream along the inside of the water passage 230, and a stable swirling flow can be formed even more effectively on the downstream side.
In addition, by forming a stable flow downstream of the cleaning water spouted from the rim spout 226 along the water passage 230 on the downstream side, splashing of the cleaning water can be prevented. visibility and cleaning efficiency can be further effectively improved.

1 Flush toilet according to the first embodiment of the present invention 2 Toilet main body 4 Toilet seat 6 Toilet lid 8 Functional section 10 Sanitary cleaning system functional section 12 Water supply system functional section 14 Filth receiving surface 16 Shelf surface 18 Rim section 20 Bowl section 22 Drainage trap Pipeline (drainage channel)
22a Inlet 22b Ascending pipe 22c Top 22d Descending pipe 24 Rim passageway (rim water discharge part)
24a Entrance part of rim water passage 24b Outside part of rim water passage 24c Bent part of rim water passage 24d Inside part of rim water passage 26 Rim spout (rim water spout)
28 Water conduit (conduit)
30 Water passage near the downstream side of the rim water spout 32 Jet water spout 34 Water storage tank 36 Pressure pump 38 Outer wall of the outer side of the rim water flow 40 Lower wall of the outer side of the rim water flow 42 Outside of the rim water flow 44 Upper wall of the outer side of the rim water passage 46 Inner peripheral surface of the rim 48 Overhang portion 50 Bent portion 52 Relaxation curve 54 Bend portion 56 Relaxation curve 100 Flush large according to the second embodiment of the present invention Toilet bowl 116 Shelf surface 130 Water passage near the downstream side of the rim spout 146 Inner peripheral surface of the rim portion 148 Overhang portion 200 Flush toilet according to the third embodiment of the present invention 218 Rim portion 226 Rim spout 226a The rim spout Hypotenuse 248 Overhang part A Cross-sectional area of the outer side of the rim water passage A0 Cross-sectional area of the water passage near the downstream side of the rim spout B Cross-section of the outer part of the rim water passage C Cross-section of the rim water passage Cross-section of the flow passage on the outside C1 Center line extending in the left-right direction that bisects the bowl part in the front-rear direction D Cross-section of the flow passage at the bending part of the rim passageway E Cross-section of the flow passage on the inner side of the rim passageway E1 The center line extending in the left-right direction that bisects the bowl portion in the front-rear direction Opening cross section E200 Opening cross section of the rim spout F1 Front area of the bowl G Channel cross section of the water passage near the downstream side of the rim water spout H Maximum height dimension of the flow passage cross section of the outer part and bent part of the rim water spout H1 Maximum height dimension of flow passage cross section A on the outside part of the rim passageway H2 Maximum height dimension of passage cross section B on the outside part of the rim passageway H3 Maximum height of passage cross section C on the outside part of the rim passageway Dimensions H4: Maximum height of cross-section D of the bent portion of the rim passageway h: Maximum height of the cross-section of the passageway inside the rim passageway h1: Maximum height of the cross-section E of the passageway inside the rim passageway Dimension L Maximum height of the passage near the downstream side of the rim spout (maximum height from the shelf surface of the passage to the bottom of the overhang)
L1 Maximum height of the water passage near the downstream side of the rim spout (maximum height from the shelf surface of the water passage to the lower end of the overhang)
L2 Maximum height of the water passage near the downstream side of the rim spout (maximum height from the shelf surface of the water passage to the lower end of the overhang)
P1 Height position of the shelf surface of the passageway near the downstream side of the rim spout P101 Height position of the overhang part forming the passageway near the downstream side of the rim spout R1 Rear area of the bowl part S1 Rim passageway S2 Adhesive surface between the upper end surface of the lower wall on the outer side of the rim and the lower end surface of the inner wall S2 Adhesive surface between the upper end surface of the outer wall on the outer side of the rim passageway and the upper wall U Vertical direction of the overhang portion Minimum thickness (minimum height of overhang)
U1 Minimum vertical thickness of overhang part (minimum height dimension of overhang part)
U2 Minimum vertical thickness of overhang part (minimum height dimension of overhang part)
W Width of the passageway near the downstream side of the rim spout W1 Width of the passageway near the downstream side of the rim spout W2 Width of the passageway near the downstream side of the rim spout W3 Width of the shelf x Width from the rim spout Distance downstream in the circumferential direction x1 Distance downstream in the circumferential direction from the rim spout x2 Distance downstream in the circumferential direction from the rim spout x3 Distance downstream in the circumferential direction from the rim spout α1 Inclination angle of the shelf α2 Shelf Inclination angle of the surface ρ Radius of curvature of the transition curve ρ1 Radius of curvature of the transition curve ρ2 Radius of curvature of the transition curve ρ3 Radius of curvature

Claims (5)

A flush toilet that is flushed and discharges waste with flush water supplied from a flush water source,
A bowl portion including a bowl-shaped dirt receiving surface and a rim portion formed at the upper edge of the dirt receiving surface;
A drainage channel that is connected to the lower part of the bowl and drains waste;
a rim water spouting part provided on the rim part and spouting cleaning water into the bowl part to form a swirling flow;
a conduit for supplying wash water supplied from the wash water source to the rim water spouting section;
The rim water spouting part forms a rim water passage through which the wash water supplied from the water conduit passes through the rim part, and also forms a rim water spout that spouts the wash water at the downstream end of the rim water passage. ,
The water passage formed on the downstream side of the rim spout is connected to the inner circumferential surface of the rim, a shelf surface formed on the lower side of the inner circumferential surface of the rim, and an upper side of the inner circumferential surface. The formed overhang portion forms a flow path cross section,
The above-mentioned water passage is configured such that the vertical thickness of the overhang portion is set smaller on the downstream side than on the upstream side, and the width of the shelf surface is set smaller on the downstream side than on the upstream side. , a flush toilet characterized by having a flow passage cross section whose cross-sectional area is substantially constant from the upstream side to the downstream side . 2. The flush toilet according to claim 1, wherein the shelf surface forming the flow path cross section is formed at a substantially constant height from the rim spout toward the downstream side. The flush toilet according to claim 1, wherein the overhang portion forming the flow path cross section is formed at a substantially constant height from the rim spout toward the downstream side. . The ratio (U:L) between the minimum height dimension (U) of the overhang part in the flow path cross section and the maximum height dimension (L) from the shelf surface to the bottom end of the overhang part is 1:6. The flush toilet according to any one of claims 1 to 3, wherein the flush toilet is set to 6:1. 5. The rim spout has a triangular opening cross section, and one side of the triangular rim spout forms the overhang portion. flush toilet.

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