Flush toilet

Abstract

The present invention provides a flush toilet that can form: a jet water flow that reaches the drain bend pipe relatively early along the bottom surface of the bowl to accelerate the timing of initiating a siphon effect; and a jet water flow that presses waste into the drain bend pipe from the jet water spouting port. In a flush toilet that discharges waste by siphoning, even with a small amount of flushing water, the performance of discharging waste from the drain bend pipe can be improved. The flush toilet (1) of the present invention comprises: a bowl (20); a drain bend pipe (22); and a jet water spouting port (32) connected to the lower portion of the bowl and opening toward the drain bend pipe. The bottom surface of the outlet portion is connected to the bottom surface of the bowl. The bottom surface (20a) of the bowl (20) forms a curved surface that is inclined downward from the top end of the bottom surface (60a) of the outlet portion of the jet water spouting port (32).

Description

[0001] This application is a divisional application of the invention patent application with the application date of June 13, 2017, the invention name of the invention and the application number of "201710469018.X".

[0002] Technical Area

[0003] The present invention relates to a flush toilet, and more particularly to a flush toilet that discharges waste by being cleaned with cleaning water supplied from a cleaning water source. Background Art

[0004] The following flush toilets are known in the past, such as those disclosed in Patent Documents 1, 2 and Figure 6 As shown, in a conventional siphon jet flush toilet 101, a jet spouting portion 132 is provided that extends linearly toward the center of the inlet 122a of the drain trap conduit 122 in order to efficiently induce a siphon effect and discharge waste through the jet spouting flow. This allows the jet spouting flow to flow toward the center of the inlet 122a of the drain trap conduit 122. The bowl bottom surface 120a of the bowl 120, connected to the outlet of the jet spouting portion 132, extends linearly from the outlet of the jet spouting portion 132 toward the center of the inlet 122a of the drain trap conduit 122.

[0005] Patent Document 1: Japanese Patent No. 5429688

[0006] Patent Document 2: Japanese Patent No. 4529178 Summary of the Invention

[0007] However, to induce a stronger siphon effect, when the jet spouting flow from jet spouting unit 132 toward the center of inlet 122a of drain trap conduit 122 is strengthened, the jet spouting flow, flowing from jet spouting unit 132 into a relatively wide area within bowl 120 near bowl bottom 120a, spreads more easily. This weakens the flow force (loses the force required to branch the flow), resulting in a flow that appears to flow along bowl bottom 120a. Consequently, in the above-described structure, the jet spouting flow collides with the riser of the drain trap conduit 122, resulting in wasted wash water flow and a failure to push waste into drain trap conduit 122, leading to a reduction in waste removal capability. Furthermore, since the jet spouting flow collides with the riser of the drain trap conduit 122, the flow is obstructed, preventing the siphon effect from being initiated earlier.

[0008] For example, Figure 6As shown, in a flush toilet having an existing jet spouting portion 132 extending in a straight line toward the center of the inlet portion 122a of the drainage bend pipe 122, the jet spouting flow of the cleaning water spouted from the jet spouting portion 132 collides with the area E on the bottom surface of the drainage bend pipe 122 opposite to the front, and the analysis shows that the cleaning water flow is wasted.

[0009] Therefore, the present invention is made to solve the above-mentioned problems of the prior art. The technical problem to be solved is to provide a flush toilet, which can form: a jet water flow that reaches the drainage bend pipe relatively early along the bottom surface of the bowl and initiates the siphon effect earlier; and a jet water flow that presses waste into the drainage bend pipe from the jet water spouting port. In a flush toilet that discharges waste by siphon action, the performance of discharging waste from the drainage bend pipe can be improved even with a small amount of cleaning water.

[0010] In order to achieve the above-mentioned object, the present invention is a flush toilet that discharges waste by cleaning with cleaning water supplied from a cleaning water source, and comprises: a bowl portion having a bowl-shaped waste receiving surface and an inner edge portion formed at the upper edge of the waste receiving surface; a drainage bend pipe connected to the lower portion of the bowl portion; and a jet water spout portion connected to the lower portion of the bowl portion and opening toward the drainage bend pipe, wherein the bottom surface of the outlet portion is connected to the bottom surface of the bowl portion, and is characterized in that the bottom surface of the bowl portion is formed so as to be inclined downward from the top end of the bottom surface of the outlet portion of the jet water spout portion than the bottom surface of the outlet portion. The top surface of the outlet flow path of the outlet flow path portion of the jet water spout portion is formed as a flat plane, and the top surface of the outlet flow path portion is formed as a plane extending in a straight line toward the outlet portion and inclined so as to be downward than the central portion of the inlet portion of the drain bend pipe and upward than the bottom surface.

[0011] In the present invention thus constructed, a portion of the jet water flow ejected along the bottom surface of the outlet portion of the jet water spouting outlet forms a water flow along the bottom surface of the bowl portion due to the wall effect, and the bottom surface of the bowl portion forms a curved surface that is inclined downward from the top end of the bottom surface of the outlet portion more than the bottom surface of the outlet portion. Therefore, it is possible to form: a jet water flow that reaches the drainage bend pipe relatively early along the bottom surface of the bowl portion and thus advances the timing of initiating the siphon effect; and a jet water flow that presses waste from the jet water spouting outlet portion toward the drainage bend pipe. In a flush toilet that discharges waste by siphon action, the performance of discharging waste from the drainage bend pipe can be improved even with a small amount of cleaning water.

[0012] In the present invention, it is preferable that the jet water spouting port portion opens downward from a central portion in the inlet of the drainage trap conduit.

[0013] In the present invention thus constructed, since the jet water outlet spouts the jet water flow toward the lower side than the central part of the inlet of the drainage bend pipe, the jet water flow merges with the water flow flowing along the bottom surface of the basin due to the wall effect and the water flow along the bottom surface of the basin separately from it while maintaining a relatively strong water potential, and the two water flows can be combined to form a water flow that flows smoothly in the drainage bend pipe, and the jet water flow can be suppressed from colliding with the inner surface of the drainage bend pipe and hindering the water flow flowing in the drainage bend pipe.

[0014] In the present invention, it is preferable that the ratio of the inclination angle of the rising conduit of the drainage trap conduit relative to the horizontal and the inclination angle of the jet spout portion relative to the horizontal be in a range of 26:1 to 6.5:1.

[0015] In the present invention thus constructed, since the jet water outlet spouts the jet water flow toward the lower side than the central part of the inlet of the drainage bend pipe, the jet water flow merges with the water flow flowing along the bottom surface of the basin due to the wall effect and the water flow along the bottom surface of the basin differently from this under a state of relatively strong water potential. The two water flows can be combined to form a water flow that flows smoothly in the drainage bend pipe, which can suppress the jet water flow from colliding with the inner surface of the drainage bend pipe and hindering the water flow flowing in the drainage bend pipe.

[0016] In the present invention, it is preferable that the angle between the bottom surface of the outlet of the jet spout and a tangent line to the bottom surface of the bowl extending downward from the top end of the bottom surface of the outlet be in the range of 140 to 165 degrees.

[0017] In the present invention thus constructed, the angle between the bottom surface of the jet spouting outlet and a tangent line to the bottom surface of the bowl extending downward from the top of the bottom surface of the jet spouting outlet forms an angle in the range of 140 to 165 degrees. Therefore, a portion of the jet spouting flow flowing along the bottom surface of the jet spouting outlet is directed toward the bottom surface of the bowl by the Coanda effect and can flow along the bottom surface of the bowl. This allows for a jet spouting flow that reaches the drain trap conduit relatively early along the bottom surface of the bowl, accelerating the timing of initiating the siphon effect, and a jet spouting flow that presses waste from the jet spouting outlet into the drain trap conduit. This improves waste discharge performance from the drain trap conduit even with a relatively small amount of flush water in flush toilets that discharge waste through the siphon effect.

[0018] According to the flush toilet of the present invention, in a flush toilet that discharges waste by siphon action, the performance of discharging waste from the drainage trap pipe can be improved even when a small amount of flush water is passed. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a perspective view showing a flush toilet according to one embodiment of the present invention, showing a state in which the toilet lid and toilet seat are rotated to the upper position.

[0020] Figure 2 Yes Figure 1 FIG. 1 is a plan view of a toilet body portion of a flush toilet according to an embodiment of the present invention.

[0021] Figure 3 This is a cross-sectional view of a flush toilet according to an embodiment of the present invention, showing a state in which the toilet lid and toilet seat are rotated to the lower position, as viewed from the left side.

[0022] Figure 3b It is an enlarged representation Figure 3 A partial enlarged cross-sectional view of area C.

[0023] Figure 4 Observed from the drainage elbow pipe side Figure 1 FIG. 1 is a partially enlarged view of a jet water spouting portion of a jet water conduit of a flush toilet according to an embodiment of the present invention.

[0024] Figure 5 The present invention is an example of the results of analyzing the flow velocity distribution near the inlet of the drainage bend pipe when the flush toilet involved in one embodiment of the present invention is used for toilet cleaning, which shows the jet water flow ejected from the jet water spouting portion and the water flow of a part of the jet water spouting flow flowing from the outlet of the jet water spouting portion along the bottom surface of the bowl that is inclined further downward.

[0025] Figure 6 As Figure 5 The comparative example of the analysis results shown is the result of analyzing the flow velocity distribution of the jet water spouting flow ejected along the bottom surface of the bowl near the inlet of the drainage bend pipe when the toilet is cleaned in an existing flush toilet. The bottom surface of the bowl extends in a straight line from the outlet of the jet water spouting part toward the center of the inlet of the drainage bend pipe.

[0026] Explanation of symbols

[0027] 1-Flush toilet; 2-Toilet body; 4-Toilet seat; 6-Toilet lid; 8-Functional part; 10-Sanitary washing system functional part; 12-Water supply system functional part; 14-Waste receiving surface; 15-Descending flat surface; 16-Table top; 17-Water accumulation part; 18-Inner edge; 20-Bath; 20a-Bath bottom; 22-Drainage elbow pipe; 22a-Inlet; 22b-Rising pipe; 22c-Top; 22d-Downcoming pipe; 22e-Rising pipe bottom; 22f-Central part; 22g-Bottom; 24-Inner edge water channel; 26-Inner edge water outlet; 28-Water guide pipe; 30-Water channel; 31-Jet water channel; 32-Jet water outlet; 3 2a-outlet; 34-water storage tank; 36-pressure pump; 60-outlet flow path; 60a-bottom surface of the lower end; 60b-side wall of the outlet flow path; 60c-top surface of the outlet flow path; 62-corner; 101-flush toilet; 120-bowl; 120a-bottom surface of the bowl; 122-drainage elbow pipe; 122a-inlet; 132-jet water spouting part; A-position; B-lower side area; C1-center line; C2-tangent line; E-area; F1-arrow; F2-arrow; F3-arrow; F4-arrow; F5-arrow; F6-arrow; L-horizontal plane; X-imaginary line; α1-angle; α2-angle; α3-angle; α4-angle. DETAILED DESCRIPTION

[0028] Next, refer to Figures 1 to 4 A flush toilet according to an embodiment of the present invention will be described.

[0029] first, Figure 1 This is a perspective view of a flush toilet according to one embodiment of the present invention, showing a state where the toilet lid and toilet seat are rotated to the upper position. Figure 2 Yes Figure 1 FIG. 1 is a top view of a toilet body portion of a flush toilet according to an embodiment of the present invention. Figure 3 This is a cross-sectional view of a flush toilet according to an embodiment of the present invention, taken from the left, showing a state where the toilet lid and toilet seat are rotated to the lower position. Figure 3b It is an enlarged representation Figure 3 A partial enlarged cross-sectional view of region C, Figure 4 Observed from the drainage elbow pipe side Figure 1 FIG. 1 is a partially enlarged view of a jet water spouting portion of a jet water conduit of a flush toilet according to an embodiment of the present invention.

[0030] like Figures 1 to 3As shown, a flush toilet 1 according to one embodiment of the present invention comprises: a toilet body 2 made of ceramic; a toilet seat 4 rotatably arranged on the toilet body 2 in the vertical direction; a toilet lid 6 rotatably arranged in the vertical direction so as to cover the toilet seat 4; and a functional portion 8 arranged at the rear of the toilet body 2.

[0031] In addition, if Figure 3 As shown, the functional part 8 includes: a sanitary washing system functional part 10, which is arranged at the upper rear part of the toilet body 2 and functions as a sanitary washing part for cleaning the user's local area; and a water supply system functional part 12, which is arranged close to the sanitary washing system functional part 10 and is related to the water supply function to the toilet body 2.

[0032] Next, if Figures 1 to 3 As shown, the toilet body 2 includes a bowl-shaped waste receiving surface 14 and a bowl portion 20 including an inner edge portion 18 formed upright from a table surface 16 at the upper edge of the waste receiving surface 14 .

[0033] In addition, if Figure 3 As shown, the toilet body 2 is as follows. An inlet portion 22 a is connected to the lower portion of the bowl 20 , and a drainage channel, namely, a drainage trap pipe 22 for discharging waste in the bowl 20 is provided.

[0034] Next, if Figure 2 As shown, the bowl portion 20 is as follows: a rim water passage 24, which is part of the rim water spouting unit, is formed within the inner rim portion 18 on the right side of the front side region of the bowl portion 20 as viewed from the front of the toilet body 2. Furthermore, a rim water spouting port 26, which is part of the rim water spouting unit, is formed at the downstream end of the rim water passage 24.

[0035] Moreover, if Figure 2 As shown, a water conduit 28, or water conduit, is connected to the upstream side of the inner rim water passage 24. This conduit supplies wash water to the inner rim water passage 24. Wash water is supplied from a mains water pipe (not shown), which is a wash water source. The upstream side of this conduit 28 is directly connected to the mains water pipe (not shown), which is a wash water source. The wash water supplied from this mains water pressure into the inner rim water passage 24 from the conduit 28 is guided forward within the inner rim water passage 24, then bends inward and rearward, and is directed to the inner rim water outlet 26 on the downstream side.

[0036] Afterwards, the cleaning water guided to the inner rim water spouting port 26 is spouted toward the rear (inner rim water spouting), and swirls in the bowl 20 through the water passage 30 (described in detail later) formed near the downstream side of the inner rim water spouting port 26, thereby forming a swirling flow in the bowl 20.

[0037] Furthermore, in the flush toilet 1 of the present embodiment, although the inner rim water spouting portion, i.e., the inner rim water passage 24 and the inner rim water spouting port 26, is described as being arranged inside the inner rim portion 18 on the right side within the front side area of ​​the bowl 20 when viewed from the front of the toilet body 2, the method is not limited to such a method, and the inner rim water spouting port may also be arranged on the inner rim portion 18 on the left side within the front side area of ​​the bowl 20, or on the right side within the rear side area of ​​the bowl 20, or on the left side within the rear side area of ​​the bowl 20 when viewing the toilet body 2 from the front.

[0038] In addition, in the flush toilet 1 of this embodiment, although the inner rim water spouting portion, namely the inner rim water passage 24 and the inner rim water spouting port 26, are formed integrally with the toilet body 2 by ceramic processing, it is also possible to form them separately from the toilet body 2 using resin or the like, for example, to create a structure in which the resin or other water passage is installed in the toilet body 2.

[0039] Moreover, if Figure 2 As shown, a jet spouting portion 32 (jet spouting outlet) is formed at the lower portion of the bowl 20, opening toward the inlet 22a of the drain trap conduit 22. The jet spouting portion 32 serves as a spouting outlet for spouting a jet stream. The jet spouting portion 32 is formed at the downstream end of a jet water conduit 31, which connects a water storage tank 34 (or water supply source) to the flow path at the lower portion of the bowl 20. The upstream side of the jet water conduit 31 is connected to the water storage tank 34 via a pressure pump 36. The water (jet spouting) discharged by the jet spouting portion 32 is generated by pressurizing the flushing water stored in the water storage tank 34 provided in the water supply system functional unit 12 by the pressure pump 36 of the water supply system functional unit 12 and then discharged from the jet spouting portion 32.

[0040] The washing water ejected from the jet spouting portion 32 flows from the inlet 22a of the drain trap conduit 22 into the ascending conduit 22b behind the inlet 22a, and then flows out from the top 22c of the drain trap conduit 22 in the ascending conduit 22b to the descending conduit 22d.

[0041] Furthermore, the water source for supplying wash water to the jet conduit 31 may be a mains water pipe or a mains water pipe utilizing the water pressure of the equipment, in addition to the water storage tank 34. The booster pump 36 of the water supply system functional unit 12 may also be omitted. For example, when using a direct mains water supply method, the booster pump 36 may be omitted because the water is pressurized by the mains water pressure.

[0042] like Figure 2As shown, the jet water conduit 31 is connected to the downstream end of the piping extending from the pressure pump 36. When viewed from above, the jet water conduit 31 extends from the left rear side of the toilet body 2 while descending forward, forming a flow path that appears to flow along the back outside of the waste receiving surface 14. The jet water conduit 31 extends forward from the side of the deepest water reservoir forming the approximate center of the bowl 20. It then extends forward of the water reservoir and toward the center of the toilet body 2. At the front of the water reservoir, it changes direction to face backward, extending toward the water reservoir 17 below the descending flat surface 15 of the waste receiving surface 14 (described later). When viewed from above, the jet water spouting portion 32 (described later) forms a linear flow path within the jet water conduit 31 extending from the front to the rear of the toilet body 2. This flow path shape of the jet water conduit 31 is formed from ceramic.

[0043] Here, regarding the specific structures of the sanitary washing system functional part 10 and the water supply system functional part 12, detailed description is omitted because they are the same as the existing structures, but the sanitary washing system functional part 10 is provided with a local washing device (not shown) including a nozzle device (not shown) that sprays washing water toward the user above the basin 20.

[0044] In addition, the sanitary washing system functional section 10 is provided with: a water storage section (not shown) for storing washing water supplied to a local washing device (not shown); a heater (not shown) for heating the washing water in the water storage section (not shown) to an appropriate temperature to make warm water; a ventilation fan (not shown); a deodorizing fan (not shown); a warm air fan (not shown); and a controller (not shown) for controlling the operation of these devices, etc.

[0045] Meanwhile, the upstream side of the water supply circuit (not shown) of the water supply system functional unit 12 is connected to a water supply source, namely a tap water pipe (not shown). The water supply circuit upstream of the water storage tank (not shown) is provided with a constant flow valve (not shown), a solenoid valve (not shown), and a switching valve (not shown) for switching between water supply to the water storage tank (not shown) and water discharge to the inner rim water discharge port 26. In addition to these components, the water supply system functional unit 12 is also provided with a controller (not shown) for controlling the opening and closing operations of the solenoid valve (not shown), the switching operation of the switching valve (not shown), and the speed and operating time of the booster pump (not shown).

[0046] Furthermore, while the flush toilet 1 according to this embodiment is described as a so-called hybrid flush toilet, the invention is not limited to this configuration and other configurations are also applicable. A hybrid flush toilet is a method in which rim water spouting from the rim spouting port 26 is performed using the water supply pressure from the main water line, while jet water spouting from the jet spouting unit 32 is performed by controlling a pressure pump (not shown) to supply flush water from a water storage tank (not shown). In other words, other configurations may include a method in which rim water spouting from the rim spouting port 26 and jet water spouting from the jet spouting unit 32 are switched by switching a valve for flush water directly supplied from the main water line, or a method in which rim water spouting from the rim spouting port 26 and jet water spouting from the jet spouting unit 32 are switched by simply switching a pump for flush water from the water storage tank.

[0047] Next, refer to Figures 2 to 4 The jet spouting portion 32 of the jet water conduit 31 of the flush toilet 1 according to one embodiment of the present invention and the bowl bottom surface 20 a of the bowl 20 connected to the jet spouting portion 32 will be described in detail.

[0048] First, if Figure 3b As shown, the jet spouting unit 32 is connected to the lower portion of the bowl 20 and opens toward the drain trap conduit 22. Furthermore, the jet spouting unit 32 is formed below a descending flat surface 15 formed on the waste receiving surface 14 of the bowl 20, in front of the water collecting portion 17. The descending flat surface 15 is a downwardly inclined flat surface that descends from the front of the waste receiving surface 14 toward the water collecting portion 17 at the rear. This descending flat surface 15 forms a flow path for waste and wash water to descend like a slide. By forming the descending flat surface 15 above the jet spouting unit 32 on the waste receiving surface 14, as indicated by arrow F6, the wash water flowing down the descending flat surface 15 flows down the slope, creating a relatively regulated flow in the water collecting portion 17 toward the inlet of the drain trap conduit 22. This improves the ability to push waste into and discharge waste from the drain trap conduit 22.

[0049] The jet spouting unit 32 includes an outlet flow path 60 extending to the outlet 32a of the jet spouting unit 32. The outlet flow path 60 comprises a lower end bottom surface 60a (outlet bottom surface) extending obliquely downward toward the outlet 32a at the lower end of the jet spouting unit 32; outlet flow path sidewalls 60b extending upward from both sides of the lower end bottom surface 60a; and an outlet flow path top surface 60c (top surface) extending toward the outlet 32a and generally parallel to the lower end bottom surface 60a. The lower end bottom surface 60a of the jet spouting unit 32 is connected to the bowl bottom surface 20a of the bowl 20 (described later) at the outlet 32a at the lower end of the jet spouting unit 32. Furthermore, the jet spouting unit 32 may further include a portion of its internal flow path that is lower than the outlet 32a.

[0050] The outlet flow path portion 60 of the jet spouting portion 32 forms a flow path extending in the front-rear direction. Figure 4 As shown, the outlet flow path portion 60 forms a substantially square flow path in the left-right cross section. Furthermore, in the left-right cross section, the lower end bottom surface 60a and / or the outlet flow path top surface 60c may also form a curved shape, such as a tube shape.

[0051] The outlet flow path portion 60 of the jet spouting section 32 is formed by a lower end bottom surface 60a, outlet flow path sidewalls 60b, and an outlet flow path top surface 60c to narrow the flow path (water flow cross-sectional area) of the jet conduit 31. The narrowing portion can be located at any location within the jet conduit 31 and can be formed in any shape. In this embodiment, the narrowing shape (e.g., a shape that maintains a substantially constant flow path cross-sectional area) continues over a predetermined length of the outlet flow path portion 60, so the narrowing portion is formed over a predetermined length. As variations, for example, the widths of the left and right sidewalls of any portion can be narrower than those of the upstream portion of the jet conduit 31, or the height from the bottom to the top of any portion can be reduced to be smaller than that of the upstream portion. Furthermore, the narrowing portion can be formed in the shape of a protrusion protruding from the wall surface, a hill, an arc, or a hemispherical shape.

[0052] The bottom surface 60a of the lower end of the outlet flow path portion 60 is formed as a substantially flat surface. The bottom surface 60a of the lower end of the outlet flow path portion 60 extends obliquely downward from the front side toward the rear side of the toilet body 2. In other words, the bottom surface 60a is formed as a slope that slopes downward from the lower side of the front side of the bowl 20 toward the lower side of the rear side of the bowl 20.

[0053] like Figure 3 As shown, the centerline C1 of the outlet flow path portion 60 (or the bottom surface 60a of the lower end portion of the outlet flow path portion 60) is inclined at an angle α1 ranging from 5 to 20 degrees relative to the horizontal plane L (i.e., horizontal). In the area near the outlet 32a, the centerline C1 of the outlet flow path portion 60 and the bottom surface 60a of the lower end portion of the outlet flow path portion 60 are formed to have approximately the same inclination angle. Furthermore, the bottom surface 60a of the lower end portion of the outlet flow path portion 60 can also be formed to be approximately horizontal.

[0054] The inclination angle α2 of the rising conduit 22b of the drain trap conduit 22 (or the rising conduit bottom surface 22e of the rising conduit 22b) relative to the horizontal plane L (i.e., horizontal) is in the range of 120 to 140 degrees. Therefore, the ratio of the inclination angle α2 of the rising conduit bottom surface 22e of the rising conduit 22b of the drain trap conduit 22 relative to the horizontal plane L (i.e., horizontal) to the inclination angle α1 of the outlet flow path portion 60 relative to the horizontal plane L (i.e., horizontal) is in the range of 26:1 to 6.5:1. In other words, the value of the inclination angle α2 of the rising conduit 22b of the drain trap conduit 22 relative to the horizontal plane L divided by the inclination angle α1 of the outlet flow path portion 60 relative to the horizontal plane L is in the range of 26 to 6.5.

[0055] Furthermore, the lower end bottom surface 60a is formed to be substantially horizontal near the outlet 32a. The position where the lower end bottom surface 60a of the substantially horizontal outlet 32a extends toward the inlet 22a of the drain trap conduit 22 (i.e., the position where the horizontal plane L extends toward the inlet 22a) is located near the center of the inlet 22a. Furthermore, the outlet 32a can be formed to have a downward inclination substantially the same as the downward inclination of the lower end bottom surface 60a (the downward inclination of the outlet flow path portion 60, i.e., the inclination of the centerline C1).

[0056] The outlet 32a of the outlet flow path 60 of the jet spouting unit 32 is located slightly above the lowest end of the bowl bottom surface 20a at the lower portion of the bowl 20. Behind the outlet 32a of the outlet flow path 60, the bowl bottom surface 20a of the bowl 20 forms a relatively gently downward slope toward the rear, i.e., the inlet 22a of the drain trap conduit 22. The bowl bottom surface 20a extends obliquely downward from the outlet 32a of the jet spouting unit 32.

[0057] The bowl bottom surface 20a of the bowl portion 20 forms a curved surface that slopes diagonally downward from the top (lower end) of the lower end bottom surface 60a of the jet spouting unit 32, further than the lower end bottom surface 60a (or the centerline C1 of the outlet flow path 60). Specifically, the downward slope of the bowl bottom surface 20a in the area near the outlet 32a of the jet spouting unit 32 is steeper than the downward slope of the lower end bottom surface 60a of the outlet 32a of the jet spouting unit 32. Furthermore, the downward slope of the bowl bottom surface 20a in the area near the outlet 32a of the jet spouting unit 32 is steeper than the downward slope of the outlet flow path 60 of the jet spouting unit 32 (the slope of the centerline C1 of the outlet flow path 60).

[0058] The bowl bottom surface 20a in the area near the outlet 32a of the bowl portion 20 has an inclination angle α3 with respect to the horizontal plane L (i.e., horizontal) ranging from 15 to 40 degrees. For example, a tangent line C2 of the bowl bottom surface 20a in the area near the outlet 32a forms an angle with respect to the horizontal plane L ranging from 15 to 40 degrees. Because the bowl bottom surface 20a forms a flow path that appears to be slightly open downward relative to the extension direction of the jet spouting portion 32, it forms a Coanda effect functional surface that generates the Coanda effect. The Coanda effect directs a portion of the jet spouting flow toward the bowl bottom surface 20a, as if along a longitudinal axis.

[0059] The bottom surface 20a of the bowl portion is connected so as to extend downward immediately from the vicinity of the outlet 32a of the outlet flow path portion 60. Since such a bottom surface 20a of the bowl portion is arranged in front of, or immediately behind, the outlet 32a of the outlet flow path portion 60 of the jet water spouting portion 32, the wall effect can be effectively generated. Since the jet water spouting flow flowing out of the outlet 32a of the outlet flow path portion 60 flows out to a relatively wide area within the bowl portion 20, the water force and flow velocity decrease immediately after flowing out. Therefore, in the area near the outlet 32a where the water force of the jet water spouting flow is relatively strong and the flow velocity is relatively high, since the bottom surface 20a of the bowl portion forms a predetermined curved surface, the water flow with relatively strong water force and high flow velocity can effectively generate the wall effect. Assuming that in an area where the water force is relatively weak and the flow velocity is relatively low, the tendency to maintain the original flow direction and flow velocity is stronger than being directed to a predetermined surface due to the wall effect, and thus the effect of the wall effect is weakened (for example, referring to the prior art Figure 6 ).

[0060] A gently curved corner portion 62 is formed between the bottom surface 60a of the lower end portion of the outlet flow path portion 60 and the bowl bottom surface 20a near the outlet 32a of the outlet flow path portion 60. The corner portion 62 is formed, for example, in the shape of an arc with a curvature radius within a range of 10 mm to 30 mm, for example, with a curvature radius of 15 mm. The angle of the corner portion 62 is an obtuse angle. As described later, a portion of the washing water can flow smoothly down from the bottom surface 60a of the lower end portion along the corner portion 62 toward the bowl bottom surface 20a due to the wall effect. Since the corner portion 62 is formed as a gently curved corner portion, it is possible to prevent the washing water flowing from the bottom surface 60a of the lower end portion along the bowl bottom surface 20a from being peeled off.

[0061] An angle α4 between the lower end bottom surface 60a of the outlet flow path portion 60 and the bowl bottom surface 20a in the vicinity of the outlet 32a (tangent line C2 to the bowl bottom surface 20a) is formed within a range of 140 to 165 degrees. Therefore, since the angle between the lower end bottom surface 60a and the bowl bottom surface 20a is formed within a predetermined range, a portion of the jet water flow flowing along the lower end bottom surface 60a of the outlet flow path portion 60 can flow along the bowl bottom surface 20a in the vicinity of the outlet 32a due to the Coanda effect.

[0062] The angle α4 between the lower end bottom surface 60a and the bowl bottom surface 20a forms the angle of the corner portion 62. Consequently, the angle α4 of the corner portion 62 also falls within a range of approximately 140 to 165 degrees. The angle α4 of the corner portion 62 is such that a portion of the jet water flow flowing along the lower end bottom surface 60a of the outlet flow path portion 60 is less likely to separate from the corner portion 62 and, due to the Coanda effect, can flow along the bowl bottom surface 20a in the area near the outlet 32a.

[0063] Furthermore, when the bowl bottom surface 20a connected to the outlet 32a extends from the outlet 32a in a generally vertical direction downward (approximately directly downward), a portion of the jet water flow flowing out along the lower end bottom surface 60a is difficult to flow along the bowl bottom surface 20a due to the wall attachment effect. Therefore, the bowl bottom surface 20a extending from the outlet 32a in a generally vertical direction downward is not included in the present invention.

[0064] like Figure 4 As shown, the outlet flow path portion 60 has an outlet flow path side wall 60b formed upright in the longitudinal direction. Each of the left and right outlet flow path side walls 60b forms a substantially flat surface. In a cross-section of the outlet flow path portion 60 in the left-right direction, the upper portion of each outlet flow path side wall 60b is formed to flare slightly further outward in the left-right direction than the lower portion.

[0065] The outlet flow path portion 60 has a substantially flat top surface 60c. The outlet flow path top surface 60c extends linearly toward the outlet 32a and is inclined downwardly from the center portion 22f of the inlet 22a of the drain trap conduit 22 and upwardly from the bottom surface 22g.

[0066] The outlet flow path portion 60 extends to the outlet 32a of the jet spouting unit 32. The outlet 32a of the jet spouting unit 32 opens toward the lower region B below the center portion 22f in the inlet 22a of the drain trap conduit 22 and above the bottom surface 22g.

[0067] like Figure 3bAs shown, the flow path at the outlet 32a of the outlet flow path section 60 extends toward the imaginary line X extending from the opening, reaching between the center portion 22f and the bottom surface 22g of the inlet 22a of the drain trap conduit 22. As indicated by arrow F2, the wash water ejected laterally from the outlet 32a of the jet spouting section 32 forms a jet spouting flow toward the lower region B of the drain trap conduit 22. The jet spouting flow toward the lower region B of the drain trap conduit 22 forms a flow that presses waste into the drain trap conduit 22. More specifically, the jet spouting flow toward the lower region B of the drain trap conduit 22 relatively strongly presses waste (feces, toilet paper, etc.) that has fallen near the bottom surface 22g of the bowl 20 into the drain trap conduit 22. Furthermore, since the jet water flow merges with the water flow toward the bottom surface of the drain trap pipe 22 described later, waste pushed into the drain trap pipe 22 can be discharged relatively strongly along the bottom surface 22g of the drain trap pipe 22.

[0068] Furthermore, an imaginary line X, which virtually extends the flow path toward the opening at outlet 32a, intersects the bottom surface 22g of the drain trap conduit 22 at a position A lower than the center portion 22f. Consequently, the wash water discharged from outlet 32a of the jet spouting portion 32 advances in the direction of discharge and, at a position A lower than the center portion 22f, merges with the water flow toward the bottom surface 22g of the drain trap conduit 22 (see arrow F3). Consequently, the water flow toward the bottom surface 22g, indicated by arrow F3, merges with the flow F2 of wash water discharged from outlet 32a at a height position A before its momentum weakens due to its ascent along the drain trap conduit 22. Since the flow of wash water discharged from outlet 32a merges while the momentum of the water flow toward the bottom surface 22g of the drain trap conduit 22 remains relatively strong, the two flows merge to form a smooth flow within the drain trap conduit 22 (see arrow F5).

[0069] Next, refer to Figures 1 to 5 , the operation (action) of the flush toilet involved in one embodiment of the present invention is described.

[0070] Figure 5 The present invention is an example of the results of analyzing the flow velocity distribution near the inlet of the drainage bend pipe when the flush toilet involved in one embodiment of the present invention is used for toilet cleaning, which shows the jet water flow ejected from the jet water spouting portion and the water flow of a part of the jet water spouting flow flowing from the outlet of the jet water spouting portion along the bottom surface of the bowl that is inclined further downward.

[0071] Figure 5This figure shows an example of the results of computer simulation data analysis of the flow velocity distribution of wash water ejected from the jet spouting unit near the inlet of the drain trap during toilet flushing using a flush toilet according to one embodiment of the present invention. In this data analysis, arrows indicate the flow direction of wash water. Long arrows with darker colors (dark gray or colors approaching black) indicate areas with higher wash water flow velocities and stronger water momentum, while shorter arrows with lighter colors (light gray or colors approaching white) indicate areas with lower wash water flow velocities and weaker water momentum.

[0072] When the user presses a full flushing operation button (not shown) after using the toilet, for example, a signal from the operation button (not shown) is sent to a controller (not shown), and the full flushing operation of the flush toilet 1 starts.

[0073] When the user operates an operation button (not shown), the controller causes washing water to flow from a water supply source such as a tap water pipe through the water conduit 28 and the rim water passage 24 and be discharged from the rim water spout 26 .

[0074] The washing water spouted from rim water spouting port 26 flows downward while swirling within bowl portion 20 , thereby washing the inner wall surface of bowl portion 20 .

[0075] After that, the water jetting begins.

[0076] First, the controller sends a signal to the pressure pump 36 to activate it. Wash water stored in the water storage tank 34 flows into the pressure pump 36 and is pressurized. The wash water pressurized by the pressure pump 36 flows through the jet water conduit 31 and is discharged from the jet water spouting unit 32. The jet water spouting unit 32 opens to the lower portion (bottom) of the bowl 20.

[0077] Because the cross-sectional area of ​​the flow path is reduced further than on the upstream side due to the constriction of the outlet flow path 60 (outlet portion) within the jet spouting section 32, the flow velocity of the wash water flowing down the jet conduit 31 is accelerated. This acceleration of the wash water flow velocity in the outlet flow path 60 also accelerates the flow of wash water flowing through the outlet flow path 60, facilitating the generation of a Coanda effect, which directs a portion of the jet water flow discharged from the jet spouting section 32 toward the bowl bottom 20a in a longitudinal direction. Furthermore, the accelerated flow velocity of the wash water discharged from the jet spouting section 32 allows the drain trap 22 to be filled with water relatively quickly, accelerating the timing of initiating the siphoning effect that discharges waste.

[0078] like Figure 3b and Figure 5 As shown, the main flow of the washing water flowing in the outlet flow path portion 60 is as follows. Figure 3bAs shown by arrow F1 in the figure, the jet water flow flows along the centerline C1 of the outlet flow path section 60 and flows out of the outlet 32a of the outlet flow path section 60 in the direction of the centerline C1 of the outlet flow path section 60. As shown by arrow F2, the jet water flow flowing out of the outlet 32a of the outlet flow path section 60 forms a relatively strong main stream along the imaginary line X, passes through the lower area B, and reaches position A on the bottom surface 22g of the drainage trap pipe 22. At this time, the water flow flowing toward the lower area B, which is lower than the center portion 22f and higher than the bottom surface 22g, can discharge waste by pushing it into the inlet portion 22a of the drainage trap pipe 22. The main stream of the jet water flow flowing out of the jet water spouting section 32 forms a flow toward the area relatively close to the center portion 22f within the inlet portion 22a, pushing waste into it. That is, near the center of the inlet 22a, when viewed from the jet water spouting portion 32, the main stream of the jet water flow can efficiently flush waste downstream while radially spreading. Furthermore, waste can be caused to merge with the relatively strong water flow generated by the Coanda effect flowing in the lower portion of the drain trap conduit 22, and the waste can be discharged more efficiently together with this relatively strong water flow.

[0079] like Figure 5 As shown by arrow F3, a portion of the jet water flow discharged from the jet water spouting section 32 separates from the main jet water flow and is directed along the bowl bottom surface 20a, which is inclined obliquely downward relative to the lower end bottom surface 60a (or the centerline C1 of the outlet flow path 60). Because the inclination angle of the outlet flow path 60 relative to the horizontal plane is formed to have a certain relationship with the inclination angle of the bowl bottom surface 20a relative to the horizontal plane, the Coanda effect allows a portion of the jet water flow discharged from the jet water spouting section 32 to flow along the bowl bottom surface 20a in the area near the outlet 32a, even in the curved area of ​​the bottom surface of the corner 62. The gently curved corner 62 prevents wash water flowing from the lower end bottom surface 60a along the bowl bottom surface 20a from separating. The Coanda effect facilitates the formation of a flow from the lower end bottom surface 60a along the bowl bottom surface 20a.

[0080] Due to the Coanda effect, the main stream of the jet water flow from the jet spouting portion 32 is split along the bowl bottom surface 20a, forming a stream that rises from the bottom surface 22g of the inlet 22a of the drain trap conduit 22 along the riser 22b of the drain trap conduit 22. This stream, split along the bowl bottom surface 20a, flows into the bowl bottom surface 20a and the inlet 22a of the drain trap conduit 22 while maintaining the water pressure and flow velocity toward the bowl bottom surface 20a. Consequently, by filling the drain trap conduit 22 relatively quickly, the timing of initiating the siphoning action for waste removal can be accelerated. Furthermore, since the drain trap conduit 22 can be filled relatively quickly, the siphoning action can be efficiently initiated with a small amount of wash water. Moreover, a portion of the water flow separated along the bottom surface 20a of the bowl merges with the main stream of the jet water flow flowing out laterally from the jet water spouting portion 32 at position A where a relatively strong water potential (flow velocity) is maintained, thereby forming a relatively strong water flow that flushes waste down from the bottom surface 22e of the rising pipe of the drainage bend pipe 22.

[0081] exist Figure 5 In the analysis results shown, as shown by arrow F2, the mainstream of the jet water flow flowing out of the jet water spouting portion 32 forms a water flow toward position A of the bottom surface 22g through the lower side area B which is lower than the central portion 22f of the drainage bend pipe 22 and higher than the bottom surface 22g. Figure 5 In the figure, the wash water flow from the jet spouting unit 32 toward the lower area B has a relatively high flow velocity and water pressure. This main stream of the jet spouting flow from the jet spouting unit 32 can effectively discharge waste from the inlet 22a of the drain trap conduit 22 into the rising conduit 22b. Furthermore, the main stream of the jet spouting flow from the jet spouting unit 32 sweeps up and presses a relatively large amount of wash water and waste near the central portion 22f, effectively discharging waste.

[0082] exist Figure 5 In the analysis results shown, as indicated by arrow F3 , a partial flow is formed along the bowl bottom surface 20 a that is separated from the main flow of the jet water flow due to the Coanda effect. Figure 5 3 shows that the washing water flow separated downward as if directed toward the bowl bottom surface 20a side relative to the main stream of the jet spouting flow advancing from the jet spouting portion 32 also has a relatively high flow velocity and water potential as shown by arrow F3.

[0083] In this way, a portion of the water flow separated along the basin bottom surface 20a flows along the basin bottom surface 20a while maintaining a relatively high flow rate and water pressure, forming a water flow that rises within the riser pipe 22b along the riser pipe bottom surface 22e. Therefore, while the main flow is pushing waste into the riser pipe 22b, as indicated by arrow F4, the separated water flow forms a flow that fills the riser pipe 22b with water earlier. Consequently, since this branched water flow allows the drain trap pipe 22 to fill with water earlier, the timing of initiating the siphoning action to discharge waste can be accelerated.

[0084] Moreover, since a part of the water flow separated along the bottom surface 20a of the bowl merges with the main stream of the jet water flow flowing out laterally from the jet water spouting portion 32 at position A where a relatively high water potential (flow velocity) is maintained, a relatively strong water flow is formed to flush the waste from the bottom surface 22e of the rising pipe of the drainage bend pipe 22, as shown by the arrow F4.

[0085] As described above, the wash water ejected from the jet spouting unit 32 flows into the drain trap conduit 22, filling the drain trap conduit 22 with water and inducing a siphon effect. Due to this siphon effect, accumulated water and waste in the bowl 20 are drawn into the drain trap conduit 22 and discharged from a downstream drain pipe (not shown).

[0086] After a predetermined time has passed since the start of supplying flushing water to the toilet body 2, the controller (not shown) stops spouting water from the rim spouting port 26 and stops the pressure pump 36, thereby completing a series of flushing operations.

[0087] Next, the operation of the flush toilet 1 according to the embodiment of the present invention described above will be described.

[0088] First, according to the flush toilet 1 involved in one embodiment of the present invention, a portion of the jet water spouting flow ejected along the lower end bottom surface 60a of the outlet portion of the jet water spouting portion 32 forms a water flow along the bowl bottom surface 20a of the bowl 20 due to the wall effect. The bowl bottom surface 20a of the bowl 20 forms a curved surface that is inclined downward from the top end of the lower end bottom surface 60a. Therefore, it is possible to form: a jet water spouting flow that reaches the drainage trap pipe 22 relatively early along the bowl bottom surface 20a of the bowl 20, thereby accelerating the timing of initiating the siphon effect; and a jet water spouting flow that presses waste from the jet water spouting portion 32 toward the drainage trap pipe 22. In the flush toilet 1 that discharges waste by the siphon effect, the performance of discharging waste from the drainage trap pipe 22 can be improved even with a small amount of flush water.

[0089] Next, according to the flush toilet 1 involved in this embodiment, since the jet water spouting portion 32 spits the jet water flow toward the lower side of the central portion 22f in the inlet portion 22a of the drainage bend pipe 22, the jet water spouting flow merges with the water flow flowing along the bowl bottom surface 20a of the bowl 20 due to the wall effect and the water flow along the bowl bottom surface 20a of the bowl 20 while maintaining a relatively strong water momentum. The two water flows can be combined to form a water flow that flows smoothly in the drainage bend pipe 22, and the jet water spouting flow can be suppressed from colliding with the inner surface of the drainage bend pipe 22 and hindering the water flow in the drainage bend pipe 22.

[0090] In addition, according to the flush toilet 1 involved in this embodiment, since the jet water spouting portion 32 spits the jet water flow toward the lower side than the central portion 22f in the inlet portion 22a of the drainage bend pipe 22, the jet water spouting flow merges with the water flow flowing along the bowl bottom surface 20a of the bowl 20 due to the wall effect and the water flow along the bowl bottom surface 20a of the bowl 20 under a relatively strong water pressure. The two water flows can be combined to form a water flow that flows smoothly in the drainage bend pipe 22, and the jet water spouting flow can be suppressed from colliding with the inner surface of the drainage bend pipe 22 and hindering the water flow flowing in the drainage bend pipe 22.

[0091] Furthermore, in the flush toilet 1 according to this embodiment, the angle between the lower end bottom surface 60a of the jet spouting portion 32 and a tangent line C2 extending downward from the tip of the lower end bottom surface 60a to the bowl bottom surface 20a of the bowl 20 forms an angle in the range of 140 to 165 degrees. Therefore, a portion of the jet spouting flow flowing along the lower end bottom surface 60a of the jet spouting portion 32 is directed toward the bowl bottom surface 20a by the Coanda effect and can flow along the bowl bottom surface 20a. Consequently, a jet spouting flow can be formed that reaches the drain trap conduit 22 relatively early along the bowl bottom surface 20a of the bowl 20, thereby accelerating the timing of initiating the siphon effect, and a jet spouting flow that presses waste from the jet spouting portion 32 into the drain trap conduit 22. This improves the performance of waste discharge from the drain trap conduit 22 in the flush toilet 1 that discharges waste through the siphon effect, even with a relatively small amount of flush water.

Claims

1. A flush toilet that discharges waste by flushing with flushing water supplied from a flushing water source, comprising: The basin portion comprises a basin-shaped waste receiving surface and an inner edge portion formed on the upper edge of the waste receiving surface; a drainage elbow pipeline connected to the lower portion of the basin; and a water jet outlet connected to the lower portion of the basin and opening toward the drain elbow pipe, wherein the bottom surface of the outlet portion is connected to the bottom surface of the basin, The flush toilet is characterized in that: The bottom surface of the bowl portion forms a curved surface that is inclined obliquely downward from the bottom surface top of the outlet portion of the jet spout portion. A downwardly inclined flat surface is formed on the upper side of the jet water spout portion, which descends from the front side toward the rear side. The descending flat surface is inclined toward the inlet of the drainage elbow pipeline, The jet water spout portion opens downward from the central portion of the inlet of the drain trap pipe. The top surface of the outlet flow path of the outlet flow path portion of the jet water spouting portion is formed as a flat surface, and the top surface of the outlet flow path forms a plane extending linearly toward the outlet portion, and the plane extends to the outlet of the outlet portion serving as the jet water spouting portion, and is inclined downwardly than the central portion of the inlet of the drainage bend pipe and upwardly than the bottom surface.

2. The flush toilet according to claim 1, characterized in that: The ratio of the inclination angle of the rising pipe of the drainage trap pipe relative to the horizontal to the inclination angle of the jet water spouting portion relative to the horizontal is in a range of 26:1 to 6.5:

1.

3. The flush toilet according to claim 1, characterized in that: A gently curved corner is formed between the bottom surface of the outlet portion of the jet water spouting portion and the bottom surface of the bowl portion.

4. The flush toilet according to claim 3, characterized in that: The angle of the corner portion is in the range of 140 degrees to 165 degrees.

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