Water-washable toilet

Abstract

The present invention aims to provide a flush toilet that can reduce product costs while ensuring that the flushing water is evenly distributed across the entire waste collection surface, thereby washing away any waste adhering to the surface. [Solution] The present invention provides a bowl portion 6 comprising a waste receiving surface 18 for receiving waste, a rim portion 20 formed above the waste receiving surface 18, and a pot portion 24 formed below the waste receiving surface 18 with a water reservoir WL formed inside; a drain trap pipe 8 connected below the bowl portion 6 for discharging waste; and a rim outlet 10 provided on the rim portion 20, which discharges cleaning water along the inner circumferential surface 20a of the rim portion 20 to form a swirling flow. The waste receiving surface 18 comprises an upper part 18a and a lower part 18b, the upper part 18a of the waste receiving surface 18 is formed in a concave shape over the entire circumference of the bowl portion 6, and the lower part 18b of the waste receiving surface 18 is formed in a convex shape over the entire circumference of the bowl portion 6.

Description

[Technical Field]

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

[0002] Conventionally, as described in Patent Document 1, for example, there has been known a flush toilet in which one rim water outlet is provided at the rear left side of a bowl portion, flush water is discharged forward from the rim water outlet, and a swirling flow cleans the filth receiving surface. Such a flush toilet is configured to discharge flush water from one rim water outlet by using the water supply pressure of flush water from a water pipe. The flush water discharged from the rim water outlet swirls along the inner circumferential surface of the rim portion and spreads over the entire filth receiving surface.

[0003] Furthermore, as described in Patent Document 2, for example, there has been known a flush toilet provided with a variable flow rate device that varies the flow rate of flush water discharged from a rim water outlet. Such a flush toilet is configured to vary the flow rate of flush water discharged from the rim water outlet by the variable flow rate device in order to wash off filth adhering to the filth receiving surface. Thereby, the flush water is uniformly spread over the entire filth receiving surface to wash off the filth adhering to the filth receiving surface. [Prior Art Literature] [Patent Literature]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2009-052228 [Patent Document 2] Japanese Unexamined Patent Application Publication No. 2013-79546 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] However, in the flush toilet described in Patent Document 1 mentioned above, when the water supply pressure of the flushing water from the water pipe changes, the flushing water cannot be evenly distributed across the entire waste receiving surface, resulting in a problem where waste attached to the waste receiving surface is not washed away. Specifically, when the water supply pressure decreases, more flushing water is discharged from the rim outlet and flows down to the front area of ​​the bowl, so the flushing water does not reach the rear area of ​​the bowl. As a result, it becomes impossible to adequately wash away the waste attached to the waste receiving surface in the rear area of ​​the bowl. On the other hand, when the water supply pressure increases, more flushing water is discharged from the rim outlet and swirls towards the rear area of ​​the bowl, so the flushing water does not flow down to the waste receiving surface in the front area of ​​the bowl. As a result, it becomes impossible to adequately wash away the waste attached to the waste receiving surface in the front area of ​​the bowl.

[0006] Figure 12 shows the flow of flushing water swirling around the bowl portion 102 in a conventional flush toilet 100. In Figure 12, the flow of flushing water discharged from the rim outlet 100 and flowing towards the front area of ​​the bowl portion 102 is indicated by F100, and the flow of flushing water flowing towards the rear area of ​​the bowl portion 102 is indicated by F101. Also in Figure 12, the area that has not been sufficiently cleaned by the flushing water (area A) is indicated in white.

[0007] As shown in Figure 12, in a conventional flush toilet 100, a portion of the flushing water discharged from the rim outlet 100 flows down to the waste receiving surface and into the front area of ​​the bowl 102 (flushing water flow F100). The remaining flushing water discharged from the rim outlet 100 swirls around the inner circumferential surface of the rim and flows into the rear area of ​​the bowl 102 (flushing water flow F101). When the water supply pressure increases, the flow rate of the flushing water flow F101 increases and the flow rate of the flushing water flow F100 decreases. As a result, the waste receiving surface in the front area on the right side of the bowl cannot be adequately cleaned by the flushing water (see area A in Figure 12).

[0008] On the other hand, as described in Patent Document 2 above, it is conceivable to use a variable flow rate device that varies the flow rate of the flushing water discharged from the rim outlet, thereby suppressing changes in the discharge pattern of the flushing water due to changes in the water supply pressure from the water pipe. However, using a variable flow rate device is undesirable because it increases product costs.

[0009] Therefore, the present invention was made to solve the above-mentioned problems, and aims to provide a flush toilet that can evenly distribute cleaning water across the entire waste receiving surface, thereby washing away waste adhering to the waste receiving surface, while keeping product costs down. [Means for solving the problem]

[0010] 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, 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 waste receiving surface comprises an upper and a lower portion, the upper portion of the waste receiving surface is formed in a concave shape over the entire circumference of the bowl portion, and the lower portion of the waste receiving surface is formed in a convex shape over the entire circumference of the bowl portion.

[0011] According to the present invention configured in this way, the waste receiving surface comprises an upper and a lower part. The upper part of the waste receiving surface is formed in a concave shape around the entire circumference of the bowl, and the lower part of the waste receiving surface is formed in a convex shape around the entire circumference of the bowl. This prevents the washing water from falling from the upper part of the waste receiving surface, and allows the washing water to be carried on the upper part of the waste receiving surface and swirled around. As a result, the washing water spreads evenly across the entire waste receiving surface, and the waste adhering to the waste receiving surface can be washed away. Furthermore, since there is no need to use a variable flow rate device, the increase in product cost can be suppressed.

[0012] In the present invention, preferably, the rim spout is provided in the rear region of the bowl and is configured to discharge the cleaning water forward. In the present invention configured as described above, the rim outlet is provided in the rear region of the bowl and is configured to discharge cleaning water forward, so that the waste receiving surface in the front region of the bowl can be cleaned with cleaning water of sufficient force.

[0013] Furthermore, in the present invention, preferably, the width of the upper part of the waste receiving surface is greater than the width of the lower part of the waste receiving surface when viewed from above. In the present invention configured in this way, the width of the upper part of the waste receiving surface is greater than the width of the lower part of the waste receiving surface in a plan view. Therefore, the upper part of the waste receiving surface can be made larger, and more washing water can be placed on the upper part of the waste receiving surface and swirled around.

[0014] In the present invention, preferably, the height of the upper part of the waste receiving surface is the same as or greater than the height of the lower part of the waste receiving surface when viewed from the side. In the present invention configured in this way, the height of the upper part of the waste receiving surface is the same as or greater than the height of the lower part of the waste receiving surface when viewed from the side. Therefore, the upper part of the waste receiving surface can be made larger, and more washing water can be placed on the upper part of the waste receiving surface and swirled around.

[0015] Furthermore, in the present invention, preferably, the boundary line between the upper and lower parts of the waste receiving surface is inclined downward toward the front when viewed from the side. In the present invention configured in this way, the boundary line between the upper and lower parts of the waste receiving surface is inclined downward toward the front when viewed from the side. This allows the upper part of the waste receiving surface in the front region of the bowl to be enlarged, and more washing water can be placed on the upper part of the waste receiving surface and swirled around.

[0016] In the present invention, preferably, an inclination angle of an upper portion of a waste receiving surface with respect to a horizontal plane is smaller in a front region of a bowl portion than in a rear region of the bowl portion in a side view. In the present invention configured as described above, since the inclination angle of the upper portion of the waste receiving surface with respect to the horizontal plane is smaller in the front region of the bowl portion than in the rear region of the bowl portion in a side view, more flushing water can be placed on the upper portion of the waste receiving surface in the front region of the bowl portion and caused to swirl.

[0017] Further, in the present invention, preferably, a width of an upper portion of the waste receiving surface, in a plan view, is larger on a side having a rim water spout among a left region and a right region of the bowl portion than a width on the other side. In the present invention configured as described above, since the width of the upper portion of the waste receiving surface, in a plan view, is larger on the side having the rim water spout among the left region and the right region of the bowl portion than the width on the other side, flushing water that has been spouted from the rim water spout and circulated one turn can be placed on the upper portion of the waste receiving surface and guided to the front region of the bowl portion. Effects of the Invention

[0018] According to the flush toilet of the present invention, it is possible to provide a flush toilet that allows flushing water to spread evenly over the entire waste receiving surface and washes away filth adhered to the waste receiving surface while suppressing an increase in product cost. Brief Description of the Drawings

[0019] [Figure 1] It is a top view of the flush toilet according to an embodiment of the present invention. [Figure 2] It is a cross-sectional view taken along line II-II in Fig. 1. [Figure 3] It is an enlarged partial view of a bowl portion of the flush toilet according to the embodiment of the present invention shown in Fig. 1. [Figure 4] It is a cross-sectional view taken along line IV-IV in Fig. 3. [Figure 5] It is a cross-sectional view taken along line V-V in Fig. 3. [Figure 6]It is a cross-sectional view taken along line VI-VI in Figure 3. [Figure 7] It is a cross-sectional view taken along line VII-VII in Figure 3. [Figure 8] It is a cross-sectional view taken along line VIII-VIII in Figure 3. [Figure 9] It is a cross-sectional view taken along line IX-IX in Figure 3. [Figure 10] It is a cross-sectional view taken along line X-X in Figure 3. [Figure 11] In the flush toilet according to an embodiment of the present invention, it is a schematic diagram showing the state of flushing water swirling in the bowl portion. [Figure 12] In a conventional flush toilet, it is a schematic diagram showing the state of flushing water swirling in the bowl portion.

Mode for Carrying Out the Invention

[0020] Hereinafter, a flush toilet according to an embodiment of the present invention (hereinafter referred to as the present embodiment) will be described with reference to the drawings. First, the overall structure of the flush toilet according to the present embodiment will be described with reference to FIG. 1 and FIG. 2. Here, FIG. 1 is a plan view of the flush toilet according to the embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1.

[0021] As shown in FIG. 1 and FIG. 2, the flush toilet 1 according to the present embodiment is a so-called siphon-jet toilet that fills the inside of a drainage trap pipe by jet water discharge to generate a siphon action. The flush toilet 1 includes a ceramic toilet body 2, a toilet seat and a toilet lid (not shown) arranged on the upper surface of the toilet body 2, and a water storage tank (not shown) arranged at the upper rear part of the toilet body 2 for storing flushing water used for toilet flushing. It should be noted that the flush toilet of the present invention is not limited to the siphon-jet type flush toilet, and may be a siphon type flush toilet that generates a siphon action by rim water discharge, or a wash-down type flush toilet that flushes away filth by the flowing water action caused by the head of flushing water in the bowl portion.

[0022] 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.

[0023] 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. In this embodiment, a shelf 22 is provided between the waste receiving surface 18 and the rim 20 of the flush toilet 1. However, the flush toilet of the present invention may not have a shelf 22, and the waste receiving surface 18 and the rim 20 may be directly connected.

[0024] 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).

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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 to 10. Figure 3 is a magnified view of the bowl portion of the flush toilet according to this embodiment shown in Figure 1, and Figures 4 to 10 are cross-sectional views taken along lines IV-IV to XX 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, and these regions are designated as the left region and the right region. Also, 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, and these regions are designated as the front region and the rear region.

[0031] As shown in Figures 3 to 5, the waste receiving surface 18 is a dry surface located above the water level WL and exposed to the outside. The waste receiving surface 18 is provided between the shelf 22 and the pot 24 (water level WL). The waste receiving surface 18 comprises an upper part 18a formed in a concave shape downwards over the entire circumference of the bowl 6, and a lower part 18b positioned below the upper part 18a and formed in a convex shape upwards over the entire circumference of the bowl 6. As a result, the washing water is carried on the concave upper part 18a and swirls around. Furthermore, the upper part 18a of the waste receiving surface 18 is provided between the shelf 22 and the lower part 18b, and the lower part 18b of the waste receiving surface 18 is provided between the upper part 18a and the pot 24 (water level WL). The boundary line X between the upper part 18a and the lower part 18b of the waste receiving surface 18 is set at the position of the inflection point where the shape changes from concave to convex (see Figures 4 and 5).

[0032] As shown in Figure 3, the width W1 of the upper part 18a of the waste receiving surface 18 is set to be larger than the width W2 of the lower part 18b of the waste receiving surface 18 in a plan view, over the entire circumference of the bowl portion 6 (W1 > W2). Here, the width W1 of the upper part 18a and the width W2 of the lower part 18b are the radial lengths of a perfect circle centered on the center O of the bowl portion 6. This makes the upper part 18a of the waste receiving surface 18 larger, allowing more washing water to be placed on the upper part 18a of the waste receiving surface 18 and swirled around.

[0033] As shown in Figure 3, the width W1 of the upper part 18a of the waste receiving surface 18 is set such that, in a plan view, the width w1 on the left side in the left region where the rim outlet 10 is located is greater than the width w2 on the right side in the right region (w1>w2). This allows the cleaning water discharged from the rim outlet 10 and circulating around to be carried onto the upper part 18a of the waste receiving surface 18 and guided to the front region of the bowl 6. Furthermore, the width W1 of the upper part 18a of the waste receiving surface 18 is set such that, in a plan view, the front width is greatest in the front region of the bowl 6 and the rear width is smallest in the rear region of the bowl 6.

[0034] As shown in Figures 4 to 10, the height H1 of the upper part 18a of the waste receiving surface 18 is set to be the same as or greater than the height H2 of the lower part 18b of the waste receiving surface 18 over the entire circumference of the bowl portion 6 when viewed from the side (H1 ≥ H2). This makes the upper part 18a of the waste receiving surface 18 larger, allowing more washing water to be placed on the upper part 18a of the waste receiving surface 18 and swirled around. Furthermore, the height H1 of the upper part 18a of the waste receiving surface 18 is set to be greatest at the front in the front region of the bowl portion 6 and greatest at the rear in the rear region of the bowl portion 6 when viewed from the side.

[0035] As shown in Figures 4 and 5, the inclination angle of the upper part 18a of the waste receiving surface 18 with respect to the horizontal plane (the angle of the interior angle between the horizontal plane and the upper part 18a of the waste receiving surface) is set such that, in a side view, the angle is smaller in the front region of the bowl portion 6 than in the rear region of the bowl portion 6. That is, the upper part 18a of the waste receiving surface 18 in the front region of the bowl portion 6 is inclined closer to the horizontal plane than the upper part 18a of the waste receiving surface 18 in the rear region of the bowl portion 6. This allows more washing water to be placed on the upper part 18a of the waste receiving surface 18 in the front region of the bowl portion 6 and swirled around. Also, as shown in Figures 4 and 5, the upper part 18a of the waste receiving surface 18 is formed with a first radius of curvature R1 in the front region of the bowl portion 6 and with a second radius of curvature R2 in the rear region of the bowl portion 6, and the first radius of curvature R1 is set to be larger than the second radius of curvature R2 (R1 > R2).

[0036] As shown in Figures 4 and 5, the boundary line X between the upper part 18a and the lower part 18b of the waste receiving surface 18 is inclined downward toward the front when viewed from the side. This allows the upper part 18a of the waste receiving surface 18 in the front region of the bowl 6 to be enlarged, enabling more washing water to be placed on the upper part 18a of the waste receiving surface 18 and swirled around.

[0037] Next, with reference to Figure 3, the flow of flushing water swirling around the bowl portion 6 in the flush toilet according to this embodiment will be explained. In Figure 3, the first swirling flow of the cleaning water discharged from the rim outlet 10 and swirling around the bowl section 6 is shown by F1, and the second swirling flow is shown by F2.

[0038] First, as shown in Figure 3, the cleaning water discharged from the rim outlet 10 flows down onto the waste receiving surface 18 while swirling around the inner circumferential surface 20a of the rim section 20 and the shelf section 22 (the swirling flow F1 of the first rotation).

[0039] Next, the cleaning water discharged from the rim outlet 10 and having completed one rotation swirls around the upper part 18a of the waste receiving surface 18 (second swirling flow F2). Here, since the upper part 18a of the waste receiving surface 18 is formed in a concave shape around the entire circumference of the bowl portion 6, the cleaning water is prevented from falling off the upper part 18a of the waste receiving surface 18, and the cleaning water swirls on the upper part 18a of the waste receiving surface 18.

[0040] Furthermore, the cleaning water that swirls around the upper part 18a of the waste receiving surface 18 flows down along the lower part 18b of the waste receiving surface 18 and flows into the water reservoir WL in the pot section 24. The cleaning water that flows into the water reservoir WL combines with the cleaning water discharged from the jet outlet 14 and flows into the drain trap pipe 8 for discharge.

[0041] Next, the operation and effects of the flush toilet 1 according to this embodiment described above will be explained. Figure 11 is a schematic diagram showing the flow of flushing water swirling around the bowl portion in a flush toilet according to an embodiment of the present invention. In Figure 11, the flow of flushing water discharged from the rim outlet 10 and flowing to the front area of ​​the bowl portion 6 is indicated by F3, and the flow of flushing water flowing to the rear area of ​​the bowl portion 6 is indicated by F4. In Figure 11, areas that have not been sufficiently cleaned by the flushing water are indicated in white.

[0042] As shown in Figure 11, in the flush toilet 1 of this embodiment, similar to a conventional flush toilet (see Figure 12), a portion of the flushing water discharged from the rim outlet 10 flows down to the waste receiving surface 18 and then to the front area of ​​the bowl 6 (flushing water flow F3). The remaining flushing water discharged from the rim outlet 10 swirls around the inner circumferential surface 20a of the rim 20 and the shelf 22 and flows to the rear area of ​​the bowl 6 (flushing water flow F4). In the flush toilet 1 of this embodiment, the upper part 18a of the waste receiving surface 18 is formed in a concave shape around the entire circumference of the bowl 6, so the flushing water that has circulated around the bowl 6 sits on the upper part 18a of the waste receiving surface 18 and swirls around (flushing water flow F4). This allows the flushing water to reach the front area on the right side of the bowl 6, and compared to a conventional flush toilet (see Figure 12), it is possible to reduce the area that is not sufficiently cleaned by the flushing water (white area in Figure 11).

[0043] In the flush toilet 1 according to this embodiment, the waste receiving surface 18 has an upper part 18a and a lower part 18b. The upper part 18a of the waste receiving surface 18 is formed in a concave shape around the entire circumference of the bowl 6, and the lower part 18b of the waste receiving surface 18 is formed in a convex shape around the entire circumference of the bowl 6. As a result, the flushing water is prevented from falling from the upper part 18a of the waste receiving surface, and the flushing water can be carried on the upper part 18a of the waste receiving surface 18 and swirled around. This allows the flushing water to spread evenly over the entire waste receiving surface 18, and the waste adhering to the waste receiving surface 18 can be washed away. Furthermore, since there is no need to use a variable flow rate device, the increase in product cost can be suppressed.

[0044] Furthermore, in the flush toilet 1 according to this embodiment, the rim spout 10 is provided in the rear area of ​​the bowl 6 and is configured to discharge flushing water forward, so that the waste receiving surface 18 in the front area of ​​the bowl 6 can be cleaned with flushing water with sufficient water pressure.

[0045] In the flush toilet 1 according to this embodiment, the width W1 of the upper part 18a of the waste receiving surface 18 is greater than the width W2 of the lower part 18b of the waste receiving surface 18 in a plan view. Therefore, the upper part 18a of the waste receiving surface 18 can be made larger, and more flushing water can be placed on the upper part 18a of the waste receiving surface 18 and swirled around.

[0046] Furthermore, in the flush toilet 1 according to this embodiment, the height H1 of the upper part 18a of the waste receiving surface 18 is the same as or greater than the height H2 of the lower part 18b of the waste receiving surface 18 when viewed from the side. Therefore, the upper part 18a of the waste receiving surface 18 can be made larger, and more flushing water can be placed on the upper part 18a of the waste receiving surface 18 and swirled around.

[0047] In the flush toilet 1 according to this embodiment, the boundary line X between the upper part 18a and the lower part 18b of the waste receiving surface 18 is inclined downward toward the front when viewed from the side. This allows the upper part 18a of the waste receiving surface 18 in the front region of the bowl 6 to be enlarged, and more flushing water can be placed on the upper part 18a of the waste receiving surface 18 and swirled around.

[0048] Furthermore, in the flush toilet 1 according to this embodiment, the inclination angle of the upper part 18a of the waste receiving surface 18 with respect to the horizontal plane is set such that, in a side view, the front region of the bowl 6 is smaller than the rear region of the bowl 6. This allows more flushing water to be placed on the upper part 18a of the waste receiving surface 18 in the front region of the bowl 6 and swirled around.

[0049] In the flush toilet 1 according to this embodiment, the width of the upper part 18a of the waste receiving surface 18 is such that, in a plan view, the width w1 on one side of the bowl portion 6 where the rim water outlet 10 is located is greater than the width w2 on the other side. Therefore, the flushing water discharged from the rim water outlet 10 and circulating around can be placed on the upper part 18a of the waste receiving surface 18 and guided to the front area of ​​the bowl portion 6.

[0050] 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]

[0051] 1: Flush toilet 2: Toilet bowl 6: Bowl section 8: Drain trap pipe 8a: Inlet of drain trap pipe 10: Rim spout 18: Waste receiving surface 18a: Upper part of the waste receiving surface 18b: Lower part of the waste receiving surface 20: Rim section 20a: Inner circumferential surface of the rim 22:Shelf 24: Acupressure points F1: Turning flow on the first lap F2: Turning flow on the second lap R1: First radius of curvature R2: Second radius of curvature W1: Width of the top of the waste receiving surface W2: Width of the bottom of the waste receiving surface H1: Height of the top of the waste receiving surface H2: Height of the bottom of the waste receiving surface WL: Reservoir surface X: Boundary between the upper and lower parts of the waste receiving surface w1: Width of the upper left side of the waste receiving surface w2: Width of the upper right side of the waste receiving surface.

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, 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 above waste receiving surface comprises an upper and a lower part, A flush toilet characterized in that the upper part of the waste receiving surface is formed in a concave shape around the entire circumference of the bowl, and the lower part of the waste receiving surface is formed in a convex shape around the entire circumference of the bowl.

2. The flush toilet according to claim 1, wherein the rim spout is provided in the rear region of the bowl and is configured to discharge flushing water forward.

3. The flush toilet according to claim 1 or 2, wherein the width of the upper part of the waste receiving surface is greater than the width of the lower part of the waste receiving surface in a plan view.

4. The flush toilet according to claim 3, wherein the height of the upper part of the waste receiving surface is the same as or greater than the height of the lower part of the waste receiving surface when viewed from the side.

5. The flush toilet according to claim 1 or 2, wherein the boundary line between the upper and lower parts of the waste receiving surface is inclined downward toward the front when viewed from the side.

6. The flush toilet according to claim 1 or 2, wherein, in a side view, the angle of inclination of the upper part of the waste receiving surface with respect to the horizontal plane is smaller in the front region of the bowl than in the rear region of the bowl.

7. The flush toilet according to claim 1 or 2, wherein, in a plan view, the width of the upper part of the waste receiving surface is such that the width of one side of the bowl portion where the rim water outlet is located is greater than the width of the other side.

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