Water-washable toilet

Abstract

To provide a flush toilet that cleans a toilet bowl with washing water supplied by the water supply pressure of tap water, and can be improved in the cleaning performance of a bowl unit.SOLUTION: A flush toilet is provided, cleaning the toilet with washing water supplied by water supply pressure. The flush toilet includes: a bowl portion 6 comprising a bowl-shaped filth receiving surface 18, a rim portion 20 formed above the filth receiving surface 18, and a shelf surface 21 formed between the filth receiving surface 18 and the rim portion 20; and one rim water spray port 10 provided in the rim portion 20 and spraying washing water toward the front along the inner peripheral surface 20a of the rim portion 20. The rim water spray port 10 is located rearward of a position X1 where the width of the filth receiving surface 18 in the left-right direction is the maximum in a plan view.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a flushing toilet, and particularly to a flushing toilet that cleans the toilet with flushing water supplied by the water supply pressure of a water pipe.

Background Art

[0002] Conventionally, as described in Patent Document 1, there is known a flushing toilet in which flushing water supplied from a water pipe is discharged from one rim discharge port. In this flushing toilet, the front end portion of the bowl portion is formed with a small radius of curvature, and a rim discharge port is provided in the vicinity of the front end portion of the bowl portion.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in a flushing toilet as described in Patent Document 1, since a rim discharge port is provided in the vicinity of the front end portion of the bowl portion, when the flushing water is discharged forward from the rim discharge port, a large energy loss occurs when turning the front end portion of the bowl portion. As a result, the momentum of the flushing water turning the bowl portion is weakened, and there is a problem that the bowl portion cannot be sufficiently flushed with water.

[0005] Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a flushing toilet that can improve the flushing performance of a bowl portion in a flushing toilet that cleans the toilet with flushing water supplied by the water supply pressure of a water pipe.

Means for Solving the Problems

[0006] To achieve the above objective, the present invention provides a flush toilet that cleans the toilet bowl with flushing water supplied by the water supply pressure of a water supply, comprising a bowl portion having a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a shelf surface formed between the waste receiving surface and the rim portion, and a single spout provided in the rim portion that discharges flushing water forward along the inner circumferential surface of the rim portion, wherein the spout is positioned to the rear of the position where the width of the waste receiving surface in the left-right direction is maximum in a plan view. In the present invention configured as described above, the water outlet is positioned behind the point where the width of the waste receiving surface in the left-right direction is maximum in a plan view, thus increasing the distance from the water outlet to the front end of the bowl. This allows a larger area to be cleaned with high-energy flushing water before energy loss occurs at the front end of the bowl. Therefore, in a flush toilet that cleans the bowl with flushing water supplied by the water supply pressure, the cleaning performance of the bowl can be improved.

[0007] In the present invention, preferably, the waste receiving surface is formed in a concave shape that is recessed downwards in its front region. In the present invention configured in this way, the waste receiving surface is formed in a concave shape that is recessed downwards in its front region, so that cleaning water can flow down from the front region of the waste receiving surface.

[0008] Furthermore, in the present invention, preferably, the waste receiving surface is formed in a convex shape that protrudes upward in the region behind the water outlet. In the present invention configured as described above, the waste receiving surface is formed in a convex shape that protrudes upward in the area behind the water outlet. Therefore, in the area behind where the force of the washing water weakens, the washing water can be carried on the convex waste receiving surface and spread throughout the area behind.

[0009] In the present invention, preferably, the waste receiving surface is formed in a convex shape that protrudes upward in the region behind the front region. In the present invention configured in this way, the waste receiving surface is formed in a convex shape that protrudes upward in the area behind the front area, so that the washing water can be placed on the convex waste receiving surface and spread throughout the entire waste receiving surface.

[0010] Furthermore, in the present invention, preferably, the rim portion is formed such that its inner circumferential surface overhangs inward toward upward, and the amount of overhang of the inner circumferential surface of the rim portion is maximized at the front end of the bowl portion. In the present invention configured in this way, the rim portion is formed such that its inner circumferential surface overhangs inward toward upward, and the amount of overhang of the inner circumferential surface of the rim portion is maximized at the front end of the bowl portion, thereby preventing washing water from splashing out at the front end of the bowl portion.

[0011] In the present invention, preferably, the rim portion is formed such that its inner circumferential surface is inclined inward toward upward, and the inclination angle of the inner circumferential surface of the rim portion toward the vertical is maximized at the front end of the bowl portion. In the present invention configured as described above, the rim portion is formed such that its inner circumferential surface inclins inward toward upward, and the inclination angle of the inner circumferential surface of the rim portion toward the vertical is maximized at the front end of the bowl portion. This prevents washing water from splashing out at the front end of the bowl portion. [Effects of the Invention]

[0012] According to the present invention, in a flush toilet that cleans the toilet bowl with flushing water supplied by the water supply pressure of the water supply, the cleaning performance of the bowl portion can be improved. [Brief explanation of the drawing]

[0013] [Figure 1] This is a plan cross-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 a flushing toilet according to an embodiment of the present invention with the upper part of the rim removed from the body. [Figure 4] It is a perspective view of a flushing toilet according to an embodiment of the present invention with the upper part of the rim removed from the body. [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 flushing operation of a flushing toilet according to an embodiment of the present invention. [Figure 8] It is a diagram for explaining the state of cleaning the bowl part in a flushing toilet according to an embodiment of the present invention.

Mode for Carrying Out the Invention

[0014] Hereinafter, a flushing 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 flushing toilet 1 according to an embodiment of the present invention will be described. FIG. 1 is a plan sectional view showing the flushing toilet according to an 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 convenience of description, the front side of the flushing toilet as viewed from the user is defined as the front side, the back side as the rear side, the right side as the right side, and the left side as the left side.

[0015] As shown in FIGS. 1 and 2, the flushing toilet 1 according to an embodiment of the present invention is a siphon jet type flushing toilet that generates a siphon action by jetting water and discharges the dirt in the bowl part to the outside through the drain trap pipe. The flush toilet 1 according to the embodiment of the present invention is a siphon jet type flush toilet, but it may also be a wash-down type toilet that washes away waste with the flowing water action caused by the difference in water level in the bowl, or a siphon type flush toilet that generates a siphon action by spraying water from the rim to discharge waste from the bowl to the outside through the drain pipe.

[0016] The flush toilet 1 comprises a ceramic toilet bowl body 2, a resin toilet seat and lid (not shown) positioned on the top surface of the toilet bowl body 2, and a water storage tank 4 positioned at the rear upper part of the toilet bowl body 2 and covered by a resin cover (not shown).

[0017] The toilet bowl body 2 includes a bowl section 6 for receiving waste, a drain trap pipe 8 provided at the bottom of the bowl section 6 for discharging waste by siphon action, 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.

[0018] The bowl portion 6 comprises a bowl-shaped waste 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 waste receiving surface 18 and the rim portion 20. The bowl portion 6 also includes a pot portion 22 formed in the area below the waste receiving surface 18 and connected to the drain trap pipe 8. A water surface W is formed inside this pot portion 22.

[0019] 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).

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] As shown in FIGS. 3 and 4, the lower end portion 20b of the inner peripheral surface 20a of the rim portion 20 is formed by the minimum radius of curvature R2 among the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 in a plan view (see the region S1 in FIG. 3). The left front portion 6b and the right front portion 6c on the rear side of the front end portion 6a of the bowl portion 6 are formed by a radius of curvature R3 (>R2) (see the regions S2 and S3 in FIG. 3). The left side portion 6d and the right side portion 6e on the further rear side of the left front portion 6b and the right front portion 6c of the bowl portion 6 are formed by the maximum radius of curvature R4 (>R3) (see the regions S4 and S5 in FIG. 3). Also, the radii of curvature R2 to 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 contour 7 of the toilet body 2 (R2 to R4 > R1). Thereby, the energy loss of the washing water flowing through the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 can be suppressed. large The left front portion 6b and the right front portion 6c on the rear side of the front end portion 6a of the bowl portion 6 are formed by a radius of curvature R3 (>R2) (see the regions S2 and S3 in FIG. 3). The left side portion 6d and the right side portion 6e on the further rear side of the left front portion 6b and the right front portion 6c of the bowl portion 6 are formed by the maximum radius of curvature R4 (>R3) (see the regions S4 and S5 in FIG. 3). Also, the radii of curvature R2 to 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 contour 7 of the toilet body 2 (R2 to R4 > R1). Thereby, the energy loss of the washing water flowing through the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 can be suppressed. Also, the radii of curvature R2 to 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 contour 7 of the toilet body 2 (R2 to R4 > R1). Thereby, the energy loss of the washing water flowing through the inner peripheral surface 20a of the rim portion 20 at the front end portion 6a of the bowl portion 6 can be suppressed.

[0034] 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 where the upper rim portion 40 and the body portion 42, which are separately molded during toilet manufacturing, are adhered is provided. The adhesive portion 20c of the rim portion 20 is formed by a radius of curvature R5 (<R2) that is smaller 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 in a plan view. 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 on 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 flush toilet 1, the upper rim portion 40 and the body portion 42, which are separately molded, can be easily adhered, and thereby, the toilet body 2 can be easily manufactured.

[0035] As shown in FIG. 3, the dirt receiving surface 18 has its front end portion 18a 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 on 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.

[0036] As shown in FIG. 3, the tub 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 tub 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.

[0037] As shown in FIG. 1, the rim water outlet 10 is disposed on the rear side of the position X1 where the width in the left - right direction of the dirt receiving surface 18 of the bowl portion 6 is maximum in plan view. Further, 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 in plan view. Thereby, the distance from the rim water outlet 10 to the front end portion 6a of the bowl portion 6 becomes relatively long.

[0038] 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, since it receives a large centrifugal force, it is difficult for the washing water to flow down, but the washing water can be made to flow down from the front region of the dirt receiving surface.

[0039] As shown in Figures 5A to 5C, the waste receiving surface 18 is formed in a convex shape that protrudes upward in the area behind the front area of ​​the waste receiving surface 18 (see Figures 5A to 5C). This allows the washing water that has passed through the inner circumferential surface 20a of the rim portion 20 at the front end 6a of the bowl portion 6 to be carried onto the convex-shaped waste receiving surface 18 and spread across the entire waste receiving surface 18.

[0040] As shown in Figures 5B and 5C, the waste receiving surface 18 is formed in a convex shape that protrudes upward in the area behind the rim outlet 10 (see Figures 5B and 5C). This allows the washing water to spread to the area behind the rim outlet 10 by resting on the convex waste receiving surface 18 in the rear area where the force of the washing water weakens.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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, the rim spout 10 is positioned behind the position X1 where the width of the waste receiving surface 18 in the left-right direction is maximum in a plan view, thereby increasing the distance from the rim spout 10 to the front end 6a of the bowl portion 6. As a result, a larger area can be cleaned with flush water in a high-energy state before energy loss occurs at the front end 6a of the bowl portion 6. Therefore, in a flush toilet 1 that cleans the toilet bowl with flush water supplied by the water supply pressure, the cleaning performance of the bowl portion 6 can be improved.

[0056] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed in a concave shape that is recessed downwards in its front region, so that flushing water can flow down from the front region of the waste receiving surface 18.

[0057] In the flush toilet 1 according to an embodiment of the present invention, the waste receiving surface 18 is formed in a convex shape that protrudes upward in the area behind the rim water outlet 10. Therefore, in the rear area where the force of the flushing water weakens, the flushing water can be carried on the convex waste receiving surface 18 and spread throughout the rear area.

[0058] Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the waste receiving surface 18 is formed in a convex shape that protrudes upward in the area behind the front area, so that the flushing water can be placed on the convex waste receiving surface 18 and spread over the entire waste receiving surface 18.

[0059] In the flush toilet bowl 1 according to an embodiment of the present invention, the rim portion 20 is formed such that its inner circumferential surface 20a overhangs inward toward upward, and the amount of overhang of the inner circumferential surface 20a of the rim portion 20 is maximized at the front end portion 6a of the bowl portion 6, thereby preventing flushing water from splashing out at the front end portion 6a of the bowl portion 6.

[0060] Furthermore, in the flush toilet bowl 1 according to the embodiment of the present invention, the rim portion 20 is formed such that its inner circumferential surface 20a is inclined inward toward upward, and the inclination angle of the inner circumferential surface 20a of the rim portion 20 toward the vertical is maximized at the front end portion 6a of the bowl portion 6, thereby preventing flushing water from splashing out at the front end portion a of the bowl portion 6.

[0061] 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]

[0062] 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 with flushing water supplied by the water pressure of the water supply, A bowl-shaped waste receiving surface, a rim formed above the waste receiving surface, and a shelf surface formed between the waste receiving surface and the rim, comprising: One water outlet is provided on the rim portion and discharges cleaning water forward along the inner circumferential surface of the rim portion, It has, Only one water outlet is provided on the rim portion for discharging cleaning water along the inner circumferential surface of the rim portion. The above-mentioned spout is positioned behind the point where the width of the waste receiving surface in the left-right direction is maximum, in a plan view. A flush toilet characterized in that the front region of the waste receiving surface is formed in a concave shape that is recessed downwards in a side cross-sectional view, and also in a concave shape that is recessed downwards in a front cross-sectional view.

2. The flush toilet according to claim 1, wherein the waste receiving surface is formed in a convex shape that protrudes upward in the area behind the water outlet.

3. The flush toilet according to claim 1 or 2, wherein the waste receiving surface is formed in a convex shape that protrudes upward in the area rearward from the front area.

4. The rim portion described above is formed such that its inner circumferential surface overhangs inward toward the upper side. The flush toilet according to claim 1, wherein the amount of overhang of the inner circumferential surface of the rim portion is formed to be maximized at the front end of the bowl portion.

5. The rim portion described above is formed such that its inner circumferential surface slopes inward toward upward, The flush toilet according to claim 1, wherein the angle of inclination of the inner circumferential surface of the rim portion toward the inward direction with respect to the vertical direction is formed to be maximum at the front end of the bowl portion.

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