Water-washable toilet

Abstract

The present invention aims to provide a flush toilet in which flushing water is discharged from a single rim outlet, and in which the flushing water spreads throughout the entire bowl, thereby thoroughly cleaning the bowl. [Solution] The present invention comprises a bowl portion 6 having a waste receiving surface 18, a rim portion 20, a shelf portion 22, and a pot portion 24; a drain trap pipe 8 for discharging waste; and a single rim outlet 10 that discharges cleaning water along the inner circumferential surface 20a of the rim portion 20 to form a swirling flow. The rim portion 20 comprises a vertical wall portion 30 extending substantially vertically from the outer peripheral edge 22a of the shelf portion 22, and a projection portion 32 projecting from the upper end of the vertical wall portion 30 toward the interior of the bowl portion 6. The rim outlet 10 has a vertical width H3 set to be less than or equal to half the vertical width of the rim portion 20, and is located below the vertical center of the rim portion 20, and the vertical width H1 of the projection portion 32 is set to be greater than the vertical width H2 of the vertical wall portion 30.

Description

Technical Field

[0001] The present invention relates to a flush toilet, and particularly to a flush toilet that cleans with flush water to discharge filth.

Background Art

[0002] Conventionally, as described in, for example, Patent Document 1, a flush toilet is known which includes: a dirt receiving surface for receiving dirt; a rim formed above the dirt receiving surface; a shelf formed between the dirt receiving surface and the rim; and one rim water spout provided on the rim, which discharges flush water along the inner circumferential surface of the rim to form a swirling flow. In such a flush toilet, the inner circumferential surface of the rim is formed to overhang toward the inside of the bowl portion, and the swirling flush water discharged from the rim water spout is guided downward by the overhang-shaped rim.

[0003] On the other hand, as described in, for example, Patent Document 2, a flush toilet is known which includes: a dirt receiving surface for receiving dirt; a rim formed above the dirt receiving surface; a shelf formed between the dirt receiving surface and the rim; and two rim water spouts provided on the rim, which discharge flush water along the inner circumferential surface of the rim to form a swirling flow. In such a flush toilet, each rim water spout is formed as a vertically elongated opening extending from the lower end to the upper end of the rim, and the swirling flush water discharged from the rim water spout is guided downward by a convex portion provided above the inner circumferential surface of the rim.

Prior Art Literature

Patent Literature

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problem to be Solved by the Invention

[0005] In a flush toilet that dispenses flushing water from a single rim spout, as described in Patent Document 1 above, it is conceivable to increase the flow velocity of the flushing water dispensed from the rim spout so that the flushing water spreads throughout the entire bowl. However, when the flow velocity of the flushing water dispensed from the rim spout increases, the flushing water swirling around the inner surface of the rim flows upward as if rushing up the inner surface of the rim. When the flushing water flows upward in this way, the momentum of the swirling water weakens, and the flushing water does not spread throughout the entire bowl, resulting in the problem that the bowl cannot be sufficiently cleaned.

[0006] Furthermore, as described in Patent Document 2 above, it is conceivable to provide a protrusion above the inner circumferential surface of the rim, but because the protrusion is provided above the inner circumferential surface of the rim, it is not possible to sufficiently suppress the upward flow of flushing water across the inner circumferential surface of the rim.

[0007] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a flush toilet in which flushing water is discharged from a single rim outlet, and in which the flushing water spreads throughout the entire bowl and the bowl can be thoroughly cleaned. [Means for solving the problem]

[0008] To achieve the above objective, the present invention provides a flush toilet that washes with flushing water and discharges waste, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a shelf portion formed between the waste receiving surface and the rim portion, and a pot portion formed below the waste receiving surface with a water reservoir inside; a drain trap pipe connected below the bowl portion for discharging waste; and a rim outlet provided in the rim portion that discharges flushing water along the inner circumferential surface of the rim portion to form a swirling flow, wherein the rim portion comprises a vertical wall portion extending substantially vertically from the outer edge of the shelf portion and a projection portion projecting toward the interior of the bowl portion from the upper end of the vertical wall portion, and the rim outlet is characterized in that its vertical width is set to be less than half the vertical width of the rim portion and is provided below the vertical center of the rim portion, and the vertical width of the projection portion is set to be greater than the vertical width of the vertical wall portion.

[0009] With the present invention configured in this way, the rim outlet is set to have a vertical width of less than half the vertical width of the rim and is located below the vertical center of the rim, thereby increasing the flow velocity of the cleaning water discharged from the rim outlet. Furthermore, since the vertical width of the protrusion is set to be greater than the vertical width of the vertical wall, it is possible to suppress the cleaning water from flowing upward along the inner circumferential surface of the rim. This prevents the force of the cleaning water in the swirling direction from weakening, so that the cleaning water spreads throughout the entire bowl and the bowl can be thoroughly cleaned.

[0010] In the present invention, preferably, the vertical wall portion and the protruding portion of the rim portion are provided around the entire circumference of the bowl portion. In the present invention configured in this way, the vertical wall portion and protrusion portion of the rim portion are provided around the entire circumference of the bowl portion, so that the flow of washing water upward along the inner surface of the rim portion can be further suppressed.

[0011] Furthermore, in the present invention, preferably, the protruding portion of the rim is curved toward the inside of the bowl portion with a predetermined radius of curvature. In the present invention configured in this way, the protruding portion of the rim is curved toward the inside of the bowl with a predetermined radius of curvature, which suppresses the upward flow of cleaning water on the inner circumferential surface of the rim and improves the ease of cleaning the protruding portion of the rim.

[0012] In the present invention, preferably, the predetermined radius of curvature at the protruding portion of the rim is formed to be minimized in the region where the outer edge of the shelf portion has the minimum radius of curvature in a plan view. In the present invention configured in this way, the predetermined radius of curvature at the protruding portion of the rim is formed to be the minimum in the region where the outer edge of the shelf portion has the minimum radius of curvature in a plan view. Therefore, it is possible to suppress the upward flow of cleaning water along the inner surface of the rim portion in the region where the outer edge of the shelf portion has the minimum radius of curvature in a plan view.

[0013] Furthermore, in the present invention, preferably, the width of the shelf portion is formed to be the smallest in the region where the outer edge of the shelf portion has the smallest radius of curvature in a plan view. In the present invention configured in this way, the width of the shelf is formed to be minimized in the region where the outer edge of the shelf has the smallest radius of curvature in a plan view. Therefore, even if the swirling washing water is affected by centrifugal force in the region where the outer edge of the shelf has the smallest radius of curvature in a plan view, it can still flow down to the waste receiving surface. [Effects of the Invention]

[0014] According to the flush toilet of the present invention, in a flush toilet that discharges flushing water from a single rim outlet, the flushing water spreads throughout the entire bowl, allowing the bowl to be thoroughly cleaned. [Brief explanation of the drawing]

[0015] [Figure 1] This is a plan view of a flush toilet according to an embodiment of the present invention. [Figure 2] This is a cross-sectional view along line II-II in Figure 1. [Figure 3]It is a cross-sectional view taken along line III-III in FIG. 2 [Figure 4A] It is a cross-sectional view taken along line IVA-IVA in FIG. 3 [Figure 4B] It is a cross-sectional view taken along line IVB-IVB in FIG. 3 [Figure 4C] It is a cross-sectional view taken along line IVC-IVC in FIG. 3 [Figure 4D] It is a cross-sectional view taken along line IVD-IVD in FIG. 3 [Figure 4E] It is a cross-sectional view taken along line IVE-IVE in FIG. 3 [Figure 4F] It is a cross-sectional view taken along line IVF-IVF in FIG. 3 [Figure 4G] It is a cross-sectional view taken along line IVG-IVG in FIG. 3 [Figure 5] It is a perspective view of the front region of the bowl portion of the flush toilet according to an embodiment of the present invention, as viewed from the upper rear side. MODE FOR CARRYING OUT THE INVENTION

[0016] Hereinafter, with reference to the drawings, a flush toilet according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described. First, with reference to FIG. 1 and FIG. 2, the overall structure of the flush toilet according to the present embodiment will be described. Here, FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1.

[0017] As shown in FIG. 1 and FIG. 2, the flush toilet 1 according to the present embodiment is a so-called siphon-jet type toilet that fills the interior of the drain trap conduit with jet water discharge to generate a siphon action. The flush toilet 1 comprises a ceramic toilet body 2, a toilet seat and a toilet cover (not shown) disposed on the upper surface of the toilet body 2, and a water storage tank (not shown) disposed at the upper rear part of the toilet body 2 for storing flush water used for toilet flushing. Furthermore, the flush toilet of the present invention is not limited to a siphon jet type flush toilet, but may also be a siphon type flush toilet that generates a siphon action by discharging water from the rim, or a wash-down type flush toilet that washes away waste with the flowing water action caused by the difference in the drop of flushing water in the bowl.

[0018] The flush toilet 1 is equipped with a ceramic toilet body 2, which has a bowl-shaped bowl section 6, a drain trap pipe 8 connected below the bowl section 6 for discharging waste, a rim spout 10 for discharging water from the rim, a rim water channel 12 for supplying flushing water to the rim spout 10, a jet spout 14 for discharging water in a jet stream, and a jet water channel 16 for supplying flushing water to the jet spout 14.

[0019] The bowl portion 6 comprises a waste receiving surface 18 for receiving waste, a rim portion 20 formed above the bowl portion 6 and having an inner circumferential surface 20a on its inside, a shelf portion 22 formed between the waste receiving surface 18 and the rim portion 20, and a pot portion 24 formed below the waste receiving surface 18 with a water reservoir WL formed inside.

[0020] The drain trap pipe 8 comprises an inlet 8a, an upward pipe 8b extending upward from the inlet 8a, a downward pipe 8c extending downward from the upward pipe 8b, and a top 8d located between the downward pipe 8c and the upward pipe 8b, which defines the water level of the accumulated water surface WL. Here, the lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0021] The rim outlet 10 is located in the rear left area of ​​the bowl section 6 and is configured to discharge cleaning water forward. The cleaning water discharged from the rim outlet 10 flows down onto the waste receiving surface 18, swirling around the inner circumferential surface 20a of the rim section 20 and the shelf section 22, and the swirling flow cleans the waste receiving surface 18.

[0022] The rim water channel 12 is formed in a tapered shape, with the cross-sectional area of ​​the channel gradually decreasing towards the rim outlet 10. A water supply pipe (not shown), which is the water source, is connected to the upstream side of the rim water channel 12. Cleaning water is supplied to the rim water channel 12 from the water supply pipe, and the water pressure from the water supply pipe is used to discharge the cleaning water from the rim outlet 10. The water source that supplies cleaning water to the rim outlet 10 is not limited to the water pipe shown in this embodiment, but may be a water storage tank or a pump, etc.

[0023] The jet outlet 14 is formed at the bottom of the bowl section 6. The jet outlet 14 is positioned opposite the inlet 8a of the drain trap pipe 8 and is directed toward the inlet 8a of the drain trap pipe 8. The jet outlet 14 discharges cleaning water toward the inlet 8a of the drain trap pipe 8, quickly filling the drain trap pipe 8 with water to generate a siphon effect.

[0024] The jet conduit 16 is formed in a U-shape overall in a plan view. A water storage tank (not shown), which is a water supply source, is connected to the upstream side of the jet conduit 16. Cleaning water is supplied to the jet conduit 16 from the water storage tank, and the cleaning water is discharged from the jet outlet 14 by the head pressure of the cleaning water stored in the water storage tank. The water source that supplies cleaning water to the jet outlet 14 is not limited to the water storage tank shown in this embodiment, but may be a water pipe or a pump, etc.

[0025] In this embodiment of the flush toilet 1, the amount of flushing water used for a full flush is 4.8 liters, and the amount of flushing water used for a partial flush is 3.8 liters. In addition, the amount of flushing water discharged from the rim outlet 10 is 2.3 liters, and the instantaneous flow rate of the flushing water discharged from the rim outlet 10 is 10 to 20 liters / minute.

[0026] Next, the shape of the bowl portion 6 of the flush toilet 1 according to this embodiment will be described in detail with reference to Figures 3 and 4A to 4G. Figure 3 is a cross-sectional view along the line III-III in Figure 2, and Figures 4A to 4G are cross-sectional views along the lines IVA-IVA to IVG-IVG in Figure 3. Furthermore, in Figure 3, the center line CL1 extending in the front-to-back direction of the toilet body in a plan view divides the inside of the bowl 6 into two equal regions in the left-to-right direction when viewed from the front of the toilet body, which are designated as the left and right sides of the bowl. Similarly, the center line CL2 extending in the left-to-right direction of the toilet body in a plan view divides the inside of the bowl 6 into two equal regions in the front-to-back direction, which are designated as the front and rear sides of the bowl. Figures 4A to 4G show cross-sections perpendicular to the flow direction of the flushing water swirling over the shelf.

[0027] As shown in Figure 3, a shelf 22 is provided around the entire circumference of the bowl 6. The shelf 22 is formed to be nearly horizontal to the waste receiving surface 18, and is configured to allow washing water to be placed on the shelf 22 and rotated. The shelf 22 is slightly inclined downward toward the inside of the bowl 6, and this inclination angle is almost constant around the entire circumference of the bowl 6 (see Figures 4A to 4G).

[0028] As shown in Figures 4A to 4G, the rim portion 20 includes a vertical wall portion 30 extending substantially vertically from the outer peripheral edge 22a of the shelf portion 22, and a projection portion 32 projecting toward the interior of the bowl portion 6 from the upper end of the vertical wall portion 30. The vertical wall portion 30 and the projection portion 32 are provided around the entire circumference of the bowl portion 6. The vertical width H1 of the projection portion 32 is set to be larger than the vertical width H2 of the vertical wall portion 30. Furthermore, the vertical width H1 of the projection portion 32 and the vertical width H2 of the vertical wall portion 30 are set to be substantially constant over the entire circumference of the bowl portion 6. This prevents the washing water from flowing upward along the inner surface of the vertical wall portion 30.

[0029] The vertical wall portion 30 is positioned below the center line CL3 of the rim portion 20 in the vertical (up and down) direction. Furthermore, the vertical width H2 of the vertical wall portion 30 is set to be less than half the vertical width (H1 + H2) of the rim portion 20, and smaller than the vertical width H1 of the protruding portion 32. In addition, the vertical width H2 of the vertical wall portion 30 is set to be larger than the vertical width H3 of the rim outlet 10 (see Figure 4A). As a result, the cleaning water discharged from the rim outlet 10 swirls along the inner circumferential surface of the vertical wall portion 30.

[0030] The protrusion 32 is positioned above the center line CL3 of the vertical center of the rim portion 20. Furthermore, the vertical width H1 of the protrusion 32 is set to be greater than half the vertical width (H1 + H2) of the rim portion 20, and greater than the vertical width H2 of the vertical wall portion 30. This prevents the cleaning water from flowing upward along the inner circumferential surface of the vertical wall portion 30.

[0031] The protruding portion 32 is curved toward the interior of the bowl portion 6 with a predetermined radius of curvature (see Figures 4B to 4G). In the first region A1, where the outer edge 22a is formed with the smallest radius of curvature R1 in plan view, the protruding portion 32 is curved with a radius of curvature r1 in side cross-sectional view (see Figure 4D). The radius of curvature r1 of this protruding portion 32 is formed to be the smallest among the radii of curvature of the protruding portions in other regions (see Figures 4B, 4C, 4E to 4G). As a result, even if the swirling cleaning water is affected by centrifugal force in the first region A1, it is possible to suppress the cleaning water from flowing upward along the inner surface of the vertical wall portion 30. In this embodiment, the protruding portion 32 is curved toward the inside of the bowl portion 6 with a predetermined radius of curvature, but it may also be formed to be inclined in a straight line toward the inside of the bowl portion 6.

[0032] As shown in Figures 3 and 4D, in a plan view, the shelf portion 22 is formed with a minimum width W1 in the first region A1 where the outer edge 22a of the shelf portion 22 has the minimum radius of curvature R1. This allows the swirling washing water in the first region A1 to flow down to the waste receiving surface 18 even when affected by centrifugal force.

[0033] As shown in Figures 3, 4A, and 4B, in the second region A2 on the left side, where the outer edge 22a of the shelf portion 22 has the maximum radius of curvature R2 in a plan view, the width of the shelf portion 22 is formed by a second width W2 that is almost constant from the upstream side to the downstream side. Furthermore, the second width W2 of the shelf portion 22 in the second region A2 on the left side is set to be larger than the first width W1 of the shelf portion 22 in the first region A1. This makes it possible to swirl the washing water discharged from the rim outlet 10 on the shelf portion 22 in the second region A2 on the left side while suppressing the water from falling onto the waste receiving surface 18.

[0034] As shown in Figures 3 and 4F, in the second region A2 on the right side, where the outer edge 22a of the shelf portion 22 has the maximum radius of curvature R2 in a plan view, the width of the shelf portion 22 is formed by a third width W3 that is almost constant from the upstream side to the downstream side. Furthermore, the third width W3 of the shelf portion 22 in the second region A2 on the right side is set to be larger than the first width W1 of the shelf portion 22 in the first region A1. This allows the washing water that has passed through the first region A1 to swirl on the shelf portion 22 in the second region A2 on the right side while preventing it from falling onto the waste receiving surface 18. As a result, the washing water passing through the second region A2 on the right side is distributed as far as possible to the rear side of the bowl portion 6.

[0035] As shown in Figure 4A, the vertical width H3 of the rim outlet 10 is set to be less than half the vertical width (H1 + H2) of the rim portion 20. Furthermore, the rim outlet 10 is located below the center line CL3 of the vertical center of the rim portion 20. In addition, the bottom surface of the rim outlet 10 is smoothly continuous with the shelf portion 22 without any steps.

[0036] Next, with reference to Figure 5, the flow of flushing water swirling around the bowl portion 6 in the flush toilet according to this embodiment will be explained. Figure 5 is a perspective view of the front area of ​​the bowl of a flush toilet according to an embodiment of the present invention, viewed from the rear and above. In Figure 5, F1 to F3 indicate the flow of flushing water.

[0037] First, as shown in Figure 5, the cleaning water discharged from the rim outlet 10 swirls around the inner circumferential surface of the vertical wall portion 30 of the rim portion 20 and on the shelf portion 22 (cleaning water flow F1).

[0038] In the first region A1 of the front area of ​​the bowl portion 6, the radius of curvature r1 of the protrusion 32 is minimized, so that the cleaning water that would otherwise flow upward along the inner surface of the vertical wall portion 30 due to the influence of centrifugal force is suppressed and swirled by the protrusion 32 (cleaning water flow F2). Also, in the first region A1, the first width W1 of the shelf portion 22 is minimized, so that the amount of cleaning water flowing down to the waste receiving surface 18 can be increased. As a result, the waste receiving surface 18 of the front area of ​​the bowl portion 6 can be thoroughly cleaned.

[0039] The cleaning water that has passed through the first region A1 swirls towards the rear region of the bowl section 6 while maintaining its momentum in the swirling direction (cleaning water flow F3). As a result, the cleaning water spreads throughout the entire bowl section 6, allowing the bowl section 6 to be thoroughly cleaned.

[0040] Next, the effects and advantages of the flush toilet 1 according to this embodiment described above will be explained. First, in the flush toilet bowl 1 according to this embodiment, the rim outlet 10 is set so that its vertical width H3 is less than half the vertical width (H1 + H2) of the rim portion 20, and is located below the center line CL3 of the vertical center of the rim portion 20, thereby increasing the flow velocity of the flushing water discharged from the rim outlet 10. In addition, the vertical width H1 of the protruding portion 32 is set to be larger than the vertical width H2 of the vertical wall portion 30, so that the flushing water does not flow upward on the inner circumferential surface of the rim portion 20. This prevents the force of the flushing water in the swirling direction from weakening, so that the flushing water spreads throughout the entire bowl portion 6 and the bowl portion 6 can be thoroughly cleaned.

[0041] In the flush toilet bowl 1 according to this embodiment, the vertical wall portion 30 and the protruding portion 32 of the rim portion 20 are provided around the entire circumference of the bowl portion 6, so that flushing water can be further suppressed from flowing upward on the inner surface of the rim portion 20.

[0042] Furthermore, in the flush toilet bowl 1 according to this embodiment, the protruding portion 32 of the rim portion 20 is curved toward the inside of the bowl portion 6 with a predetermined radius of curvature, which suppresses the upward flow of flushing water on the inner circumferential surface of the rim portion 20 and improves the ease of cleaning the protruding portion 32 of the rim portion 20.

[0043] In the flush toilet bowl 1 according to this embodiment, the predetermined radius of curvature of the protruding portion 32 of the rim portion 20 is formed to be minimized in the first region A1 where the outer peripheral edge 22a of the shelf portion 22 has the minimum radius of curvature R1 in a plan view. Therefore, in the first region A1 where the outer peripheral edge 22a of the shelf portion 22 has the minimum radius of curvature R1 in a plan view, it is possible to suppress the flow of flushing water upward along the inner surface of the rim portion 20.

[0044] Furthermore, in the flush toilet 1 according to this embodiment, the first width W1 of the shelf portion 22 is formed to be minimized in the first region A1 where the outer edge 22a of the shelf portion 22 has the minimum radius of curvature R1 in a plan view. Therefore, even if the swirling flush water is affected by centrifugal force in the first region A1 where the outer edge 22a of the shelf portion 22 has the minimum radius of curvature R1 in a plan view, it can still flow down to the waste receiving surface 18.

[0045] The present invention is not limited to the embodiments described above, and various modifications and variations are possible within the scope of the technical idea described in the claims. [Explanation of symbols]

[0046] 1: Flush toilet 2: Toilet bowl 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 10: Rim spout 12: Rim water conduit 18: Waste receiving surface 20: Rim section 20a: Inner circumferential surface of the rim 22:Shelf 22a: Outer edge of the shelf section 30:Vertical wall part 32:Protrusion

Claims

1. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed above the waste receiving surface, a shelf portion formed between the waste receiving surface and the rim portion, and a pot portion formed below the waste receiving surface with a water reservoir inside, A drain trap pipe is connected below this bowl section for discharging waste, One rim outlet is provided on the rim portion and discharges cleaning water along the inner circumferential surface of the rim portion to form a swirling flow, It has, The rim portion comprises a vertical wall portion extending substantially vertically from the outer edge of the shelf portion, and a projection portion projecting toward the interior of the bowl portion from the upper end of the vertical wall portion. The above-mentioned rim outlet is set to have a vertical width of less than half the vertical width of the rim portion and is located below the vertical center of the rim portion. A flush toilet characterized in that the vertical width of the above-mentioned protruding portion is set to be greater than the vertical width of the above-mentioned vertical wall portion.

2. The flush toilet according to claim 1, wherein the vertical wall portion and protruding portion of the rim portion are provided around the entire circumference of the bowl portion.

3. The flush toilet according to claim 1 or 2, wherein the protruding portion of the rim is curved toward the inside of the bowl portion with a predetermined radius of curvature.

4. The flush toilet according to claim 3, wherein the predetermined radius of curvature at the protruding portion of the rim is formed to be the smallest in the region where the outer edge of the shelf portion has the smallest radius of curvature in a plan view.

5. The flush toilet according to claim 4, wherein the width of the shelf portion is formed to be the smallest in the region where the outer edge of the shelf portion has the smallest radius of curvature in a plan view.

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