Water-washable toilet

Abstract

To provide a flush toilet capable of thoroughly cleaning the entire bowl unit while reducing the energy loss of washing water flowing along the inner surface of a rim.SOLUTION: A disclosed flush toilet 1, in which the toilet bowl is flushed with flush water supplied from the flush water source to remove waste, includes: a bowl unit 6 that includes a bowl-shaped waste receiving surface 18 and a rim 20 formed above the waste receiving surface 18; and a rim discharge port 10 that is provided on the rim 20 for discharging washing water along the inner peripheral surface 20a of the rim 20. The front end 6a of the bowl unit 6 is formed, in plan view, the radius of curvature R2 of the inner peripheral surface 20a of the rim 20 is formed to be larger than the radius of curvature R1 of the outer wall 7 of the toilet body 2.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a flushing toilet, and particularly to a flushing toilet that washes the toilet with flushing water supplied from a flushing water source to discharge dirt.

Background Art

[0002] Conventionally, as described in Patent Document 1, a flushing toilet having an external design with a pointed front end of the bowl portion is known. The outer contour of such a flushing toilet is formed so that the radius of curvature of the front end portion is small in a plan view. Further, the inner peripheral surface of the rim portion of such a flushing toilet is formed so that the radius of curvature of the front end portion is small so as to have the same radius of curvature as the outer contour in a plan view.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flushing toilet as described in Patent Document 1, since the radius of curvature of the front end portion of the inner peripheral surface of the rim portion is formed to be small, when the flushing water is discharged forward from the rim water discharge port, the flushing water passes through the front end portion. There is a problem that the energy is lost and the momentum is weakened, and the entire bowl portion cannot be sufficiently washed. In particular, in the flushing toilet as described in Patent Document 1, the flushing water supplied from the water supply is discharged from one rim water discharge port, and a relatively small amount of flushing water is discharged at a relatively high flow rate. Therefore, when the flushing water receives energy loss when passing through the front end portion, the problem that the entire bowl portion cannot be sufficiently washed occurs remarkably.

[0005] Therefore, the present invention has been made to solve the above-mentioned problems, and aims to provide a flush toilet that can thoroughly clean the entire bowl by suppressing energy loss of the flushing water flowing on the inner circumferential surface of the rim. [Means for solving the problem]

[0006] To achieve the above objective, the present invention provides a flush toilet that cleans the toilet bowl and discharges waste using flushing water supplied from a flushing water source, comprising: a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface; and a water outlet provided in the rim portion that discharges flushing water along the inner circumferential surface of the rim portion, wherein at the front end of the bowl portion, in a plan view, the radius of curvature of the inner circumferential surface of the rim portion is formed to be greater than the radius of curvature of the outer casing of the toilet bowl body. In the present invention configured as described above, at the front end of the bowl portion, in a plan view, the radius of curvature of the inner surface of the rim portion is formed to be larger than the radius of curvature of the outer casing of the toilet bowl body. Therefore, even if the outer casing of the toilet bowl body is formed with a small radius of curvature, energy loss of the flushing water flowing over the inner surface of the rim portion at the front end of the bowl portion can be suppressed. Thus, energy loss of the flushing water flowing over the inner surface of the rim portion can be suppressed, and the entire bowl portion can be thoroughly cleaned.

[0007] In the present invention, preferably, the inner circumferential surface of the rim portion is formed in plan view such that the front end of the bowl portion has the smallest radius of curvature, and the rear side of the front end of the bowl portion has a radius of curvature larger than the smallest radius of curvature. In the present invention configured as described above, the inner circumferential surface of the rim portion is formed in plan view such that the front end of the bowl portion has the smallest radius of curvature, while the rear side of the front end of the bowl portion has a larger radius of curvature than the smallest radius of curvature. This suppresses energy loss of the cleaning water flowing on the inner circumferential surface of the rim portion at the front end of the bowl portion, allowing the entire bowl portion to be thoroughly cleaned.

[0008] Furthermore, in the present invention, preferably, at the front end of the bowl portion, the inner circumferential surface of the rim portion is formed such that, in a plan view, the radius of curvature at its lower end is larger than the radius of curvature of the outer casing of the toilet bowl body, and the radius of curvature above the lower end is formed to be approximately the same as the radius of curvature of the outer casing of the toilet bowl body. In the present invention configured as described above, at the front end of the bowl portion, the inner circumferential surface of the rim portion is formed such that the radius of curvature at its lower end is greater than the radius of curvature of the outer casing of the toilet bowl body. This suppresses energy loss of the flushing water flowing through the inner circumferential surface of the rim portion at the front end of the bowl portion. Furthermore, since the inner circumferential surface of the rim portion is formed such that the radius of curvature above its lower end is approximately the same as the radius of curvature of the outer casing of the toilet bowl body, the toilet bowl body can be easily manufactured.

[0009] In the present invention, preferably, the bowl portion is formed between the waste receiving surface and the rim portion and includes a shelf surface over which the washing water discharged from the spout swirls, and the radius of curvature of the front end of the waste receiving surface is formed to be larger than the radius of curvature of the inner circumferential surface of the rim portion at the front end of the bowl portion in a plan view. In the present invention configured as described above, the bowl portion is formed between the waste receiving surface and the rim portion and includes a shelf surface on which the washing water discharged from the spout swirls. The radius of curvature of the front end of the waste receiving surface is formed to be larger than the radius of curvature of the inner circumferential surface of the rim portion at the front end of the bowl portion in a plan view, so that the washing water swirling on the shelf surface can flow smoothly down to the waste receiving surface.

[0010] Furthermore, in the present invention, preferably, the water outlet is configured so that the washing water is discharged forward. In the present invention configured in this way, the water outlet is configured so that the flushing water is discharged forward. Therefore, even in a flush toilet where the flushing water is discharged forward from the water outlet, it is possible to suppress the energy loss of the flushing water flowing on the inner circumferential surface of the rim at the front end of the bowl. [Effects of the Invention]

[0011] According to the flush toilet of the present invention, it is possible to suppress the energy loss of the washing water flowing on the inner peripheral surface of the rim portion and sufficiently wash the entire bowl portion.

Brief Description of the Drawings

[0012] [Figure 1] It is a plan sectional view showing a flush toilet according to an embodiment of the present invention. [Figure 2] It is a side sectional view taken along line II-II of FIG. 1. [Figure 3] It is a plan view of the flush toilet according to the embodiment of the present invention in a state where the upper part of the rim is removed from the body part. [Figure 4] It is a perspective view of the flush toilet according to the embodiment of the present invention in a state where the upper part of the rim is removed from the body part. [Figure 5A] It is a sectional view taken along line VA-VA of FIG. 1. [Figure 5B] It is a sectional view taken along line VB-VB of FIG. 1. [Figure 5C] It is a sectional view taken along line VC-VC of FIG. 1. [Figure 6A] It is a sectional view taken along line VIA-VIA of FIG. 1. [Figure 6B] It is a sectional view taken along line VIB-VIB of FIG. 1. [Figure 7] It is a diagram for explaining the washing operation of the flush toilet according to the embodiment of the present invention. [Figure 8] It is a diagram for explaining the state of washing the bowl portion in the flush toilet according to the embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0013] Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the drawings. First, referring to FIGS. 1 and 2, the basic structure of the flush toilet 1 according to the embodiment of the present invention will be described. FIG. 1 is a plan sectional view showing the flush toilet according to the embodiment of the present invention, and FIG. 2 is a side sectional view taken along line II-II of FIG. 1. <In this specification, for the user's perspective, the front side of the water closet is described as the front side, the rear side as the back side, the right side as the right side, and the left side as the left side.

[0014] As shown in FIGS. 1 and 2, the water closet 1 according to an embodiment of the present invention is a siphon jet type water closet that generates a siphon action by jet water discharge and discharges the dirt in the bowl portion to the outside through the drain trap pipe. The water closet 1 according to an embodiment of the present invention is a siphon jet type water closet. However, it may also be a wash-down type toilet that washes away dirt by the flowing water action due to the water level difference in the bowl portion, or a siphon type water closet that generates a siphon action by rim water discharge and discharges the dirt in the bowl portion to the outside through the drain pipe.

[0015] The water closet 1 includes a ceramic toilet body 2, a resin toilet seat and lid (not shown) disposed on the upper surface of the toilet body 2, and a water storage tank 4 disposed at the upper rear of the toilet body 2 and covered by a resin cover (not shown).

[0016] The toilet body 2 is formed with a bowl portion 6 for receiving dirt, a drain trap pipe 8 provided at the bottom of the bowl portion 6 for discharging dirt by siphon action, a rim water discharge port 10 for performing rim water discharge, a rim water guide path 12 for supplying washing water to the rim water discharge port 10, a jet water discharge port 14 for performing jet water discharge, and a jet water guide path 16 for supplying washing water to the jet water discharge port 14.

[0017] The bowl portion 6 includes a bowl-shaped dirt receiving surface 18, a rim portion 20 formed along the upper edge of the bowl portion 6, and a shelf surface 21 formed between the dirt receiving surface 18 and the rim portion 20. Further, the bowl portion 6 includes a tub portion 22 formed in the region below the dirt receiving surface 18 and connected to the drain trap pipe 8. A water storage surface W is formed inside the tub portion 22.

[0018] 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 that defines the water level. The lower end of the downward pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0019] The rim spout 10 (spout) is formed only once on the left rear of the rim portion 20 when viewed from the front of the toilet bowl body 2. The rim spout 10 discharges flushing water forward, and this flushing water swirls over the inner circumferential surface 20a and shelf surface 21 of the rim portion 20, flowing down to the waste receiving surface 18 and cleaning the waste receiving surface 18.

[0020] 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 when viewed from above. A water supply hose 13, which is directly connected to the water supply, 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, and the cleaning water is discharged from the rim outlet 10 due to the water supply pressure from the water supply.

[0021] 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, and this cleaning water flows into the drain trap pipe 8 to activate the siphon effect.

[0022] The jet conduit 16 extends forward from the water storage tank 4, bends, and then extends backward. One end of the jet conduit 16 is connected to the drain port 4a of the water storage tank 4, and the other end is connected to the jet outlet 14. Cleaning water is supplied to the jet conduit 16 from the water storage tank 4, and the head pressure of this cleaning water causes the cleaning water to be discharged from the jet outlet 14.

[0023] The water storage tank 4 is a gravity-fed tank that stores the cleaning water used for jet discharge and supplies it to the jet outlet 14. The water storage tank 4 is a small resin tank. The water storage tank 4 has a volume of approximately 3 liters, and the amount of cleaning water discharged from the water storage tank 4 in one wash cycle is approximately 2 liters.

[0024] Inside the water storage tank 4, there is a water supply device 24 that supplies cleaning water to the water storage tank 4, a drainage device 26 that supplies or stops the cleaning water stored in the water storage tank 4 to the jet water conduit 16, and a float switch 28 that detects when the water level of the cleaning water in the water storage tank 4 reaches the full water level. Outside the water storage tank 4, there is a controller (not shown) that controls the operation of the water supply device 24 and the drainage device 26 to be driven or stopped based on the user's operation signals, and an operation unit (not shown) that transmits operation signals in response to the user's operation.

[0025] The water supply device 24 includes a constant flow valve (not shown) connected to the water supply, a rim-side solenoid valve 23 that supplies or stops the flow of cleaning water to the rim outlet 10, and a tank-side solenoid valve 27 that supplies or stops the flow of cleaning water to the tank inlet 25 located inside the water storage tank 4. The rim-side solenoid valve 23 and the tank-side solenoid valve 27 are driven by a controller command based on user operation signals or water level detection signals from the float switch 28.

[0026] The drainage device 26 includes an overflow pipe 30 for draining overflow water from the water storage tank 4 into the toilet bowl body 2, a drain valve 32 fixed to the lower end of the overflow pipe 30, and a toilet flushing unit 36 ​​that opens and closes the drain valve 32 by moving the overflow pipe 30 up and down using an electric drive. The toilet flushing unit 36 ​​is driven by a controller command based on the user's operation signal.

[0027] The controller is electrically connected to the control unit, float switch 28, rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36, and is capable of sending and receiving various signals. The controller receives a flush start signal for a full or partial flush from the control unit and drives or stops the rim-side solenoid valve 23, tank-side solenoid valve 27, and toilet flushing unit 36 ​​based on a pre-stored flushing sequence.

[0028] In the flush toilet 1 according to an embodiment of the present invention, the amount of water used for flushing is set to approximately 4.8 liters for a full flush and approximately 3.8 liters for a partial flush.

[0029] Next, with reference to Figures 2 to 6, the structure of the bowl portion 6 of the flush toilet 1 according to an embodiment of the present invention will be described in detail. Figure 3 is a plan view of a flush toilet according to an embodiment of the present invention with the upper rim removed from the body; Figure 4 is a perspective view of a flush toilet according to an embodiment of the present invention with the upper rim removed from the body; Figures 5A to 5C are cross-sectional views along the VA-VA line to VC-VC line in Figure 1; and Figures 6A to 6B are cross-sectional views along the VIA-VIA line to VIB-VIB line in Figure 1. Figures 5A to 5C are cross-sectional views along lines extending radially from the center O of the bowl portion 6.

[0030] First, as shown in Figure 2, the inner circumferential surface 20a of the rim portion 20 has its lower end 20b connected to the shelf surface 21. Furthermore, the inner circumferential surface 20a of the rim portion 20 is provided with an adhesive portion 20c to which the rim upper portion 40 and the body portion 42, which are molded separately during toilet manufacturing, are bonded. This adhesive portion 20c is located near the vertical center of the rim portion 20 at the front end 6a of the bowl portion 6 (see Figure 2). The inner circumferential surface 20a of the rim portion 20 extends upward toward the outside of the bowl portion 6 from the lower end 20b to the adhesive portion 20c, and then extends upward toward the inside of the bowl portion 6 from the adhesive portion 20c to the upper end 20d.

[0031] Next, as shown in Figure 3, the outer casing 7 of the toilet bowl body 2 is formed such that the radius of curvature R1 in plan view at the front end 6a of the bowl portion 6 is smaller than the radius of curvature of the outer casing 7 of the toilet bowl body 2 on the rear side. The radius of curvature R1 at the front end of the outer casing 7 of the toilet bowl body 2 is formed by the smallest radius of curvature of the outer casing 7 of the toilet bowl body 2. As a result, the flush toilet 1 has an appearance with a pointed front end at the outer casing 7 of the toilet bowl body 2.

[0032] As shown in Figures 3 and 4, the lower end portion 20b of the inner circumferential surface 20a of the rim portion 20 is formed in plan view at the front end portion 6a of the bowl portion 6 with the smallest radius of curvature R2 of the inner circumferential surface 20a of the rim portion 20 (see region S1 in Figure 3). The left front portion 6b and the right front portion 6c, which are located behind the front end portion 6a of the bowl portion 6, have a radius of curvature smaller than the smallest radius of curvature R2. large The bowl portion 6 is formed with a radius of curvature R3 (>R2) (see regions S2 and S3 in Figure 3). The left front portion 6b and the right front portion 6c of the bowl portion 6 are further rearward, and the left side portion 6d and the right side portion 6e are formed with the largest radius of curvature R4 (>R3) (see regions S4 and S5 in Figure 3). In addition, the radii of curvature R2~R4 of the lower end portion 20b of the rim portion 20 are formed to be larger than the radius of curvature R1 of the front end portion of the outer casing 7 of the toilet body 2 (R2~R4>R1). This makes it possible to suppress energy loss of the flushing water flowing over the inner circumferential surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6.

[0033] As shown in FIGS. 3 and 4, above the lower end portion 20b of the inner peripheral surface 20a of the rim portion 20, an adhesive portion 20c is provided where the upper rim portion 40 and the body portion 42, which are separately molded during toilet manufacturing, are adhered. The adhesive portion 20c of the rim portion 20 is formed, in plan view, at the front end portion 6a of the bowl portion 6 with a radius of curvature R5 (<R2) smaller than the radius of curvature R2 of the lower end portion 20b of the rim portion 20. The radius of curvature R5 of the adhesive portion 20c of this rim portion 20 is formed to be approximately the same size as the radius of curvature R1 of the front end portion of the outer contour 7 of the toilet body 2 (R5 = R1). Thus, the radius of curvature R2 of the lower end portion 20b of the rim portion 20 is formed to be larger than the radius of curvature R1 of the front end portion of the outer contour 7 of the toilet body 2, so that no energy loss occurs in the washing water swirling around the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6. On the other hand, since the radius of curvature R5 of the adhesive portion 20c of the rim portion 20 is formed to be approximately the same size as the radius of curvature R1 of the front end portion of the outer contour 7 of the toilet body 2, during the manufacture of the washlet toilet 1, the separately molded upper rim portion 40 and the body portion 42 can be easily adhered, thereby enabling the toilet body 2 to be easily manufactured.

[0034] As shown in FIG. 3, the front end portion 18a of the dirt receiving surface 18 is formed with a radius of curvature R6. The radius of curvature R6 of the front end portion 18a of the dirt receiving surface 18 is formed to be larger than the radius of curvature R2 of the lower end portion 20b of the rim portion 20 at the front end portion 6a of the bowl portion 6 (R6 > R2). Thereby, the washing water swirling around the shelf surface 21 smoothly flows down onto the dirt receiving surface 18. In the embodiment of the present invention, the radius of curvature R6 of the front end portion 18a of the dirt receiving surface 18 is formed to be larger than the radius of curvature R2 of the lower end portion 20b of the rim portion 20 at the front end portion 6a of the bowl portion 6, but it may be formed to have the same size as the radius of curvature R2 of the lower end portion 20b of the rim portion 20.

[0035] As shown in Fig. 3, the indentation portion 22 has its front end portion 22a formed with a radius of curvature R7. The radius of curvature R7 of the front end portion 22a of the indentation portion 22 is formed to be smaller than the radius of curvature R1 of the front end portion of the outer contour 7 of the toilet body 2, the radius of curvature R2 of the lower end portion 20b of the rim portion 20, and the radius of curvature R6 of the front end portion 18a of the dirt receiving surface 18 (R7 < R1, R2, R6). Thereby, the washing water smoothly flows into the water storage surface W.

[0036] As shown in Fig. 1, in plan view, the rim water outlet 10 is disposed on the rear side of the position Xl where the width in the left - right direction of the dirt receiving surface 18 of the bowl portion 6 is maximum. Further, in plan view, the rim water outlet 10 is disposed on the rear side of the position X2 where the width in the left - right direction of the water storage surface W is maximum. Thereby, the distance from the rim water outlet 10 to the front end portion 6a of the bowl portion 6 becomes relatively long.

[0037] Next, as shown in Fig. 2, the dirt receiving surface 18 is formed in a concave shape that recesses downward in its front region. Thereby, in the front region of the dirt receiving surface, the washing water is difficult to flow down because it receives a large centrifugal force, but the washing water can be made to flow down from the front region of the dirt receiving surface.

[0038] As shown in Figs. 5A - 5C, the dirt receiving surface 18 is formed in a convex shape that protrudes upward in a region on the rear side of the front region of the dirt receiving surface 18 (see Figs. 5A - 5C). Thereby, the washing water that has passed through the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 lies on the convex - shaped dirt receiving surface 18 and spreads over the entire dirt receiving surface 18.

[0039] As shown in Figs. 5B and 5C, the dirt receiving surface 18 is formed in a convex shape that protrudes upward in a region on the rear side of the rim water outlet 10 (see Figs. 5B and 5C). Thereby, in the region on the rear side where the momentum of the washing water weakens, the washing water lies on the convex - shaped dirt receiving surface 18 and spreads over the region on the rear side of the rim water outlet 10.

[0040] As shown in Figures 2 and 5A to 5C, the angle of inclination of the waste receiving surface 18 toward the center O of the bowl portion 6 (the angle of inclination toward the horizontal) is formed to be minimized in the front region of the waste receiving surface 18. In other words, the angle of inclination of the waste receiving surface 18 toward the center O of the bowl portion is formed to be larger in the rear region than in the front region of the waste receiving surface 18. This allows the washing water to flow smoothly from the front region of the waste receiving surface 18 into the water surface W.

[0041] As shown in Figures 6A and 6B, the waste receiving surface 18 has a recess 18b in its front region that is recessed downwards. The recess 18b extends linearly from the front end 6a of the bowl portion 6 toward the water surface W at the rear. As a result, the washing water swirling around the waste receiving surface 18 is collected by the recess 18b and flows toward the water surface W.

[0042] As shown in Figures 2 and 5A to 5C, the amount by which the inner circumferential surface 20a of the rim portion 20 overhangs into the bowl portion 6 (the amount by which the upper end portion 20d of the rim portion 20 protrudes into the bowl portion 6 relative to the lower end portion 20b) is formed to be maximum at the front end portion 6a of the bowl portion 6. This prevents the flushing water from splashing out of the toilet bowl at the front end portion 6a of the bowl portion 6, where it is susceptible to being subjected to a large centrifugal force.

[0043] As shown in Figures 2 and 5A to 5C, the inclination angle of the inner circumferential surface 20a of the rim portion 20 toward the inside of the bowl portion 6 with respect to the vertical is formed to be maximum at the front end portion 6a of the bowl portion 6. This prevents the flushing water from splashing out of the toilet bowl at the front end portion 6a of the bowl portion 6, where it is susceptible to being subjected to a large centrifugal force.

[0044] Next, with reference to Figure 7, the flushing operation of the flush toilet 1 according to an embodiment of the present invention will be described. Figure 7 is a diagram illustrating the flushing operation of a flush toilet according to an embodiment of the present invention.

[0045] Figure 7(a) shows the standby state, where cleaning water has accumulated in the bowl section 6 up to the initial water level of the reservoir W, and cleaning water has also accumulated in the jet water channel 16 up to the same height as the initial water level of the reservoir W. At this time, air is stagnating in region A on the upstream side of the jet water channel 16, which is located directly below the water storage tank 4.

[0046] Next, as shown in Figure 7(b), the water supply device is activated (the rim-side solenoid valve opens), and cleaning water is discharged from the rim outlet 10 (rim water discharge begins). The cleaning water discharged from the rim outlet 10 swirls around the bowl section 6 and flows into the reservoir water surface W. As the water level of the reservoir water surface W gradually rises, the water level of the cleaning water in the jet water channel 16 also gradually rises. As a result, the air that had been stagnant in area A is discharged from the overflow pipe 30, and the jet water channel 16 becomes full of water.

[0047] Subsequently, as shown in Figure 7(c), with cleaning water being discharged from the rim outlet 10, the drainage device 26 is activated (the drain valve 32 opens), and cleaning water is discharged from the jet outlet 14 (jet discharge begins). At this time, the cleaning water remaining in the jet conduit 16 is subjected to the head pressure of the cleaning water stored in the storage tank 4, and a first flow rate is discharged from the jet outlet 14. The first flow rate is a large flow rate, and the jet discharge of the first flow rate fills the drain trap pipe 8, activating the siphon action. The jet discharge of the first flow rate continues for a predetermined time, and the sewage is discharged by the powerful siphon action.

[0048] Next, as shown in Figure 7(d), the drainage device 26 stops (the drain valve 32 closes) while cleaning water is being discharged from the rim outlet 10. Even though the drainage device 26 stops, a large volume of cleaning water remains in the jet conduit 16 due to its large overall volume. The water flows through the jet conduit 16 under the head pressure of the stored cleaning water, causing a second flow rate to be discharged from the jet outlet 14. The second flow rate is smaller than the first flow rate, but it is sufficient to continue the siphon effect. The jet discharge of the second flow rate continues for a predetermined time, and the siphon effect is maintained.

[0049] Subsequently, as shown in Figure 7(e), the siphon action causes the accumulated water to be discharged along with the waste, lowering the water level W. Air then enters from the upper end of the inlet 8a of the drain trap pipe 8, ending the siphon action. Here, the jet water channel 16 is formed so that the cleaning water continues to stagnate, delaying the entry of air and thus delaying the end of the siphon action. Cleaning water is continuously discharged from the rim outlet 10, and cleaning is completed when the cleaning water in the bowl section 6 reaches the initial water level W. At this time, the cleaning water in the jet water channel 16 is also at the same height as the water level W.

[0050] Next, as shown in Figure 7(f), the water supply device is activated (the tank-side solenoid valve opens) and water supply to the tank begins. When the water level of the cleaning water in the storage tank 4 rises and the float switch detects that the water level has reached the shut-off level (full water level), the water supply device stops (the tank-side solenoid valve closes), and then, as shown in Figure 7(a), the system returns to its initial state.

[0051] Next, with reference to Figure 8, the cleaning process of the bowl portion 6 in the flush toilet 1 according to an embodiment of the present invention will be described. Figure 8 illustrates the cleaning process of the bowl portion of a flush toilet according to an embodiment of the present invention.

[0052] As shown in Figure 8, most of the cleaning water discharged from the rim outlet 10 swirls on the inner circumferential surface 20a of the rim portion 20 and the shelf surface 21 (F1). Since the radius of curvature R2 of the inner circumferential surface 20a of the rim portion 20 is large at the front end 6a of the bowl portion 6, the energy loss of the cleaning water flowing on the inner circumferential surface 20a of the rim portion 20 is suppressed.

[0053] The washing water swirling on the shelf surface 21 flows down from the shelf surface 21 to the waste receiving surface 18 and swirls on the waste receiving surface 18. The waste receiving surface 18 has a convex shape that protrudes upward in the area behind the front area of ​​the waste receiving surface 18, so a portion of the washing water swirling on the waste receiving surface 18 is guided to the rear area (F2). Also, the waste receiving surface 18 has a concave shape that recesses downward in the front area of ​​the waste receiving surface 18, so a portion of the washing water swirling on the waste receiving surface 18 is guided from the concave shape of the waste receiving surface 18 to the water reservoir surface W (F3). The washing water guided to the water reservoir surface W flows smoothly into the water reservoir surface W because the radius of curvature of the front end portion 22a of the pot portion 22 is small.

[0054] The following describes the effects and benefits of the flush toilet 1 according to the embodiment of the present invention described above. In the flush toilet 1 according to an embodiment of the present invention, at the front end 6a of the bowl portion 6, the radius of curvature R2 of the inner circumferential surface 20a of the rim portion 20 is formed to be larger than the radius of curvature R1 of the outer casing 7 of the toilet body 2 in a plan view. Therefore, even if the outer casing 7 of the toilet body 2 is formed with a small radius of curvature R1, it is possible to suppress energy loss of the flushing water flowing over the inner circumferential surface 20a of the rim portion 20 at the front end 6a of the bowl portion 6. Thus, energy loss of the flushing water flowing over the inner circumferential surface 20a of the rim portion 20 is suppressed, and the entire bowl portion 6 can be thoroughly cleaned.

[0055] Furthermore, in the flush toilet bowl 1 according to the embodiment of the present invention, the inner circumferential surface 20a of the rim portion 20 is formed in plan view such that the front end portion 6a of the bowl portion 6 has the smallest radius of curvature R2, and the rear side of the bowl portion 6 is formed with a radius of curvature R3 that is larger than the smallest radius of curvature R2. Therefore, energy loss of the flushing water flowing on the inner circumferential surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 is suppressed, and the entire bowl portion 6 can be thoroughly cleaned.

[0056] In the flush toilet 1 according to an embodiment of the present invention, at the front end 6a of the bowl portion 6, the inner circumferential surface 20a of the rim portion 20 is formed such that the radius of curvature of its lower end 20b is larger than the radius of curvature of the outer casing 7 of the toilet body 2, thereby suppressing energy loss of the flushing water flowing through the front end 6a of the bowl portion 6. Furthermore, the inner circumferential surface 20a of the rim portion 20 is formed such that the radius of curvature R5 above the lower end 20b is approximately the same as the radius of curvature R1 of the outer casing 7 of the toilet body 2, thus enabling easy manufacturing of the toilet body 2.

[0057] Furthermore, in the flush toilet 1 according to an embodiment of the present invention, the bowl portion 6 is formed between the waste receiving surface 18 and the rim portion 20 and includes a shelf surface 21 on which the flushing water discharged from the rim outlet 10 swirls. The radius of curvature R6 of the front end portion 18a of the waste receiving surface 18 is formed to be larger than the radius of curvature R2 of the inner circumferential surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 in a plan view, so that the flushing water swirling on the shelf surface 21 can flow smoothly down onto the waste receiving surface 18.

[0058] In the flush toilet 1 according to an embodiment of the present invention, the rim outlet 10 is configured to discharge flushing water forward. Therefore, even in a flush toilet 1 where flushing water is discharged forward from the rim outlet 10, energy loss of the flushing water flowing over the inner circumferential surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 can be suppressed.

[0059] 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]

[0060] 1: Flush toilet 2: Toilet bowl 4: Water storage tank 6: Bowl section 6a: Front end of the bowl section 6b: Front left part of the bowl 6c: Front right side of the bowl 6d: Left side of the bowl section 6e: Right side of the bowl 7: Outer casing of the toilet bowl 8: Drain trap pipe 8a: Inlet of drain trap pipe 10: Rim spout 14: Jet nozzle 18: Waste receiving surface 18a: Front end of the waste receiving surface 18b: Recess in the waste receiving surface 20: Rim section 20a: Inner circumferential surface of the rim 20b: Lower end of the rim 20c: Adhesive part of the rim 20d: Upper end of the rim 21: Shelf surface 22: Acupressure points 22a: Anterior end of the acupoint 40: Upper part of the rim 42: Torso

Claims

1. A flush toilet that cleans the toilet bowl and discharges waste using flushing water supplied from a flushing water source, A bowl portion comprising a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface, A water outlet is provided on the rim portion and discharges cleaning water along the inner circumferential surface of the rim portion, It has, At the front end of the bowl portion, in a plan view, the radius of curvature of the inner circumferential surface of the rim portion is formed to be greater than the radius of curvature of the outer casing of the toilet bowl body. A flush toilet characterized in that, in a plan view, the inner circumferential surface of the rim portion is formed with the smallest radius of curvature at the front end of the bowl portion, and with a radius of curvature larger than the smallest radius of curvature at the rear of the front end of the bowl portion.

2. A flush toilet that cleans the toilet bowl and discharges waste using flushing water supplied from a flushing water source, A bowl portion comprising a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface, A water outlet is provided on the rim portion and discharges cleaning water along the inner circumferential surface of the rim portion, It has, At the front end of the bowl portion, in a plan view, the radius of curvature of the inner circumferential surface of the rim portion is formed to be greater than the radius of curvature of the outer casing of the toilet bowl body. A flush toilet characterized in that, at the front end of the bowl portion, the inner circumferential surface of the rim portion is formed such that, in a plan view, the radius of curvature at its lower end is larger than the radius of curvature of the outer casing of the toilet bowl body, and the radius of curvature above the lower end is formed to be approximately the same as the radius of curvature of the outer casing of the toilet bowl body.

3. The bowl portion is formed between the waste receiving surface and the rim portion and includes a shelf surface through which the washing water discharged from the spout swirls. The flush toilet according to claim 1 or 2, wherein the radius of curvature of the front end of the waste receiving surface is formed to be greater than the radius of curvature of the inner circumferential surface of the rim at the front end of the bowl, in a plan view.

4. The flush toilet according to claim 1 or 2, wherein the water outlet is configured to discharge flushing water forward.

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