Flush toilet bowl device

Abstract

To suppress waving of a water surface of washing water inside a tank device and water splash due to waving.SOLUTION: A flush toilet bowl device according to an embodiment has a toilet bowl body and a tank device. The toilet bowl body comprises: a bowl part to receive dirt; a water discharge port to discharge washing water toward the bowl part; and a drain trap part that forms a part of a drain flow passage to discharge the dirt received by the bowl part by the washing water from the water discharge port. The tank device has a water storage unit to store the washing water to be fed to the toilet bowl body, and a water feed unit that is disposed above the water storage unit and feeds the washing water to the water storage unit. The tank device has a water flow changing part, which changes a direction of the water flow toward a water level of the washing water stored in the tank device by the washing water discharged from a water feed port of the water feed unit.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, flush toilets have been known that are equipped with a tank device having a water storage unit that stores flush water and a water supply unit that is positioned above the water storage unit and supplies flush water to the water storage unit, and that flush the toilet using flush water stored in the water storage tank of the water storage unit (see, for example, Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-051236 [Patent Document 2] Japanese Patent Publication No. 2022-050981 Summary of the Invention [Problem to be solved by the invention]

[0004] In flush toilets, the flush water level inside the tank device must be stabilized in order to ensure that the appropriate amount of flush water inside the tank device is used stably. Also, in flush toilets, from a hygiene perspective, it is undesirable for the flush water inside the tank device to come into contact with the water supply port of the water supply unit due to the surface of the flush water inside the tank device rippling.

[0005] However, in conventional flush toilets such as those described above, the flush water discharged from the water supply port of the water supply unit located above the water storage unit flows from top to bottom, that is, it falls from above and is supplied to the water storage tank of the water storage unit, and the flush water from the water supply port can cause the surface of the flush water inside the tank device to ripple significantly.

[0006] If the surface of the flush water inside the tank device ripples significantly, for example, if there is an air-opening section in the water supply unit that opens part of it so that flush water can be discharged outside the water supply unit, there is a risk that flush water will leak outside the water supply unit (this is called "external leakage"). Also, if the surface of the flush water inside the tank device ripples significantly, there is a risk that the flush water will come into contact with the water supply port, for example.

[0007] As such, conventional flush toilets such as those described above have room for improvement in terms of preventing rippling of the flush water surface inside the tank device and water splashing caused by rippling.

[0008] One aspect of the embodiment aims to provide a flush toilet that can reduce rippling of the flush water surface inside the tank device and water splashing caused by the rippling. [Means for solving the problem]

[0009] A flush toilet according to one aspect of the embodiment comprises a toilet body having a bowl portion for receiving waste, a water outlet for discharging flushing water toward the bowl portion, and a drain trap portion that forms part of a drainage flow path that discharges waste received in the bowl portion using flushing water from the water outlet, and a tank device having a water storage unit for storing flushing water to be supplied to the toilet body, and a water supply unit arranged above the water storage unit and supplying flushing water to the water storage unit, and the tank device has a water flow changer that changes the direction of the flow of flushing water discharged from the water supply port of the water supply unit toward the water surface of the flushing water stored in the tank device.

[0010] With this configuration, the direction of the flow of flush water stored in the tank device toward the water surface can be changed by the water flow change section, thereby stabilizing the flush water level inside the tank device. This makes it possible to reduce rippling of the flush water surface inside the tank device and water splashing caused by rippling, and thereby suppressing, for example, leakage outside the machine due to rippling of the flush water surface and water splashing caused by rippling, and the occurrence of flush water coming into contact with the water supply port.

[0011] Furthermore, in the above flush toilet, the water storage unit has an opening formed therein through which flush water is supplied from the water supply unit, and has a water storage tank that stores flush water to be supplied to the toilet body, the water supply unit is detachably attached to the opening of the water storage tank, its internal space is connected to the attached water storage tank, and it has a smaller volume than the water storage tank, and the water flow change section has a rib portion formed in a rib shape and is arranged inside the water supply unit.

[0012] With this configuration, the rib portion of the water flow changing section can change the direction of the flow of flush water toward the surface without completely blocking the flow of flush water. Furthermore, by locating the water flow changing section inside the water supply unit, the flush water level can be stabilized inside the water supply unit, which is a small space where rippling is more likely to occur, and the flush water level can be stabilized in the water supply unit, which is located close to the water supply inlet. This makes it possible to reduce rippling on the surface of flush water inside the tank device and water splashing caused by rippling, and to prevent, for example, leakage outside the machine due to rippling on the surface of flush water and water splashing caused by rippling, and flush water coming into contact with the water supply inlet.

[0013] Furthermore, in the above flush toilet, the water supply unit has a throat pipe whose one end opens below the water supply port and whose other end opens in a water conduit through which flush water flows toward the toilet body, the throat pipe has a curved surface that is curved so as to receive flush water from the water supply port and send the received flush water downstream of the throat pipe, and the water flow change section has a flange portion formed in a flange shape with the hole portion as its center, and is positioned at the one end of the throat pipe.

[0014] With this configuration, when flush water discharged from the water supply port flows into the throat pipe, the flange can prevent flush water from flowing back from inside the throat pipe to outside the throat pipe. This makes it possible to prevent rippling of the flush water surface inside the tank device and water splashing caused by rippling, and can prevent, for example, leakage outside the machine due to rippling of the flush water surface and water splashing caused by rippling, and the occurrence of flush water coming into contact with the water supply port.

[0015] Furthermore, in the above flush toilet, the throat pipe is positioned so that, in a plan view, the center of the one end is offset from the center of the water supply port and the curved surface is located directly below the center of the water supply port, and the water flow change section is positioned so that, in a plan view, the center of the hole is offset toward the curved surface from the center of the one end.

[0016] With this configuration, when flush water discharged from the water supply port flows into the throat pipe, the flange can suppress the flow of flush water flowing back from the inside of the throat pipe to the outside of the throat pipe, even at a position where the flow is strong on the opposite side of the curved surface. This makes it possible to suppress rippling of the flush water surface inside the tank device and water splashing caused by rippling, and can suppress, for example, leakage outside the machine due to rippling of the flush water surface and water splashing caused by rippling, and the occurrence of flush water coming into contact with the water supply port.

[0017] Furthermore, in the flush toilet described above, the water flow changing portion is a surface that curves downward as the flange portion approaches the hole portion.

[0018] With this configuration, the flange is curved in a so-called cone shape toward the hole, making it possible for the curved surface of the flange to guide flush water from the water supply port to one end that serves as the entrance to the throat pipe. Also, the curved back surface of the flange can suppress the flow of flush water that flows back from the inside of the throat pipe to the outside of the throat pipe by gradually attenuating the force of the flow.

[0019] Furthermore, in the flush toilet described above, the lower end of the water flow changing section is spaced apart from the one end of the throat pipe in a side view.

[0020] With this configuration, the flow of cleaning water flowing back from inside the throat pipe to outside the throat pipe can be changed in direction toward the water surface without stagnating at the flange portion. [Effects of the Invention]

[0021] A flush toilet according to one aspect of the embodiment can reduce rippling of the flush water surface inside the tank device and water splashing caused by rippling. [Brief explanation of the drawings]

[0022] [Figure 1] FIG. 1 is a schematic side view showing the overall configuration of a flush toilet according to an embodiment. [Figure 2] FIG. 2 is a schematic plan view showing the overall configuration of the flush toilet according to the embodiment. [Figure 3] FIG. 3 is a schematic perspective view (part 1) showing the tank device. [Figure 4] FIG. 4 is a schematic perspective view (part 2) showing the tank device. [Figure 5] FIG. 5 is a schematic perspective view showing the water supply unit. [Figure 6] FIG. 6 is a schematic plan view showing the water supply unit. [Figure 7] FIG. 7 is a schematic perspective view (part 1) showing the throat pipe. [Figure 8] FIG. 8 is a schematic side cross-sectional view (part 1) showing the water supply unit and the throat pipe. [Figure 9] FIG. 9 is a schematic perspective view (part 2) showing the throat pipe. [Figure 10] FIG. 10 is a schematic cross-sectional side view (part 2) showing the water supply unit and the throat pipe. [Figure 11] FIG. 11 is a schematic plan view showing the throat pipe and the water flow changing section. [Figure 12] FIG. 12 is a schematic side view showing the throat pipe and the water flow changing section. [Figure 13] FIG. 13 is an explanatory diagram of the flow of flush water in a flush toilet according to an embodiment. [Figure 14] FIG. 14 is an explanatory diagram of the flow of flush water in a flush toilet according to a comparative example. [Figure 15] FIG. 15 is an explanatory diagram of the flow of flush water in a flush toilet according to another embodiment. [Figure 16] FIG. 16 is an explanatory diagram of the flow of flush water in a flush toilet according to a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0023] Embodiments of the flush toilet disclosed in this application will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0024] <Overall configuration of a flush toilet> The overall structure of a flush toilet 1 according to an embodiment will be explained with reference to Figures 1 to 4. Figure 1 is a schematic side view showing the overall structure of a flush toilet 1 according to an embodiment. Figure 2 is a schematic plan view showing the overall structure of a flush toilet 1 according to an embodiment. Figures 3 and 4 show the tank device D T 3 is a schematic perspective view showing the tank device D. T Figure 4 shows the tank device D from the rear left diagonally above. T This shows the case when viewed from above.

[0025] 1 to 4 may show a three-dimensional Cartesian coordinate system including a Z-axis whose positive direction is vertically upward (upward). For ease of explanation, the positive direction of the X-axis will be defined as the left, the negative direction of the X-axis as the right, the positive direction of the Y-axis as the forward direction, and the negative direction of the Y-axis as the backward direction, and the X-axis direction will be referred to as the left-right direction, the Y-axis as the front-back direction, and the Z-axis as the up-down direction.

[0026] As shown in Figures 1 and 2, the flush toilet 1 comprises a toilet body 2 and a tank device D T a flush water supply flow path 5, and an overflow flow path 6. The flush toilet 1 is a so-called wall-hung flush toilet in which the toilet body 2, which will be described later, is fixed to the wall surface WS of the toilet room (or the front wall surface of a cabinet, etc.).

[0027] The toilet body 2 is made of ceramic. However, the toilet body 2 is not limited to being made of ceramic, and may be made of resin, or a combination of ceramic and resin, for example. The toilet body 2 comprises a bowl portion 21, a rib portion 22, a spout 23, a drain trap portion 24, and a skirt portion 27. The bowl portion 21 is formed in a concave shape. The bowl portion 21 has a bowl surface 21a that receives waste. The rib portion 22 is provided above the bowl portion 21. The rib portion 22 is provided on the upper edge of the bowl surface 21a.

[0028] The water outlet 23 is formed inside the bowl portion 21 and discharges flush water from the water storage unit 4 onto the bowl surface 21 a inside the bowl portion 21 .

[0029] Drain trap portion 24 is received by bowl portion 21 and forms part of a drainage flow path that discharges waste inside bowl portion 21. One end of drain trap portion 24 is connected to the bottom of bowl portion 21, and the other end is connected to drain pipe 25. One end of drain trap portion 24 is inlet portion 24a of drain trap portion 24, which also serves as the inlet portion of the drainage flow path.

[0030] Furthermore, drain trap section 24 includes, from the upstream side to the downstream side, a curved pipe line 24b and a descending pipe line 24c. An upstream inlet section (inlet section 24a of drain trap section 24) of curved pipe line 24b is connected to the lower part of bowl section 21. Then, a drain flow path is formed that extends from inlet section 24a to a rearward and downward lowest end section 24d, and then rises to a rearward and upward peak section 24e.

[0031] The descending pipe 24c forms a drain flow path that descends rearward and downward from the top 24e of the curved pipe 24b and then connects to the drain socket 26. A water seal (water seal surface WL0) is formed in the area of ​​the curved pipe 24b upstream (forward) of the top 24e. The drain pipe 25 to which the other end of the drain trap section 24 is connected extends upward from below the floor surface FS and then is directed toward the toilet body 2 (forward), and the inlet located at the upstream end of the drain pipe 25 is connected to the outlet 24f at the downstream end of the drain trap section 24 via the drain socket 26.

[0032] Skirt portion 27 is provided so as to surround bowl portion 21 and drain trap portion 24 from the outside. Note that skirt portion 27 is not limited to being made of ceramic and formed integrally with toilet body 2, but may also be, for example, a panel member made of resin or the like that is provided separately from toilet body 2 and removably attached to cover toilet body 2 from the outside.

[0033] Tank Device D T The flushing machine comprises a water supply unit 3 and a water storage unit 4. The water supply unit 3 comprises a water supply pipe 31. The water supply pipe 31 supplies flush water to the water storage unit 4, which will be described later. The upstream end of the water supply pipe 31 is connected to a water supply source 32, such as a water line. A stop valve 33 and a valve unit 34 are provided on the water supply pipe 31, in this order from the water supply source 32 to the downstream side.

[0034] The valve unit 34 includes a constant flow valve (not shown), a diaphragm valve (not shown) which is an on-off valve provided downstream of the constant flow valve, and a solenoid valve (not shown) which opens and closes the diaphragm valve.

[0035] A water supply nozzle 31a is provided at the downstream end of water supply pipe 31. Water supply nozzle 31a has a water supply port 31b that supplies flush water to a water storage tank 41 (see Figures 3 and 4), which will be described later. For example, when the diaphragm valve is opened by the operation of the solenoid valve of valve unit 34, flush water supplied to water supply pipe 31 from water supply source 32 by water supply pressure from a tap or the like passes through stopcock 33 and a constant flow valve of valve unit 34, where the flow rate is adjusted to a constant value, and then passes through the diaphragm valve. Flush water that has passed through valve unit 34 falls, for example, from water supply port 31b of water supply nozzle 31a, and is supplied into the water storage tank 41 from connection port 41a.

[0036] As shown in Figures 3 and 4, the water storage unit 4 comprises a water storage tank 41 and a pressure pump 42. The water storage tank 41 stores flush water supplied from the water supply port 31b. The water storage tank 41 is incorporated into the lower part of the toilet body 2. The flush water supplied from the water supply port 31b is supplied to the inside of the water storage tank 41 (see Figure 3), as described above. The water storage tank 41 is connected on the top surface of the water storage tank 41 to a connection port 41a, which serves as the inlet for flush water from the water supply port 31b.

[0037] Pressure pump 42 pressurizes flush water from water storage tank 41 and supplies it to bowl portion 21 of toilet body 2. Pressure pump 42 is incorporated inside toilet body 2. When pressure pump 42 is activated, flush water supplied to the inside of water storage tank 41 flows through flush water supply flow path 5, which will be described later, and is supplied to toilet body 2, and further flows through a water conduit (not shown) through which flush water supplied to toilet body 2 flows, and is supplied from spout 23 (also called "rim spout") to the inside of bowl portion 21 (bowl surface 21a).

[0038] The flush toilet 1 also has a controller (not shown) that controls the operation of the pressure pump. The controller is installed somewhere on the toilet body 2. The water supply unit 3 also has a float switch (not shown) that detects the level of flush water inside the water storage tank 41. The opening and closing operation of the solenoid valve of the valve unit 34 is controlled by the controller based on the level of flush water inside the casing 35 detected by the float switch. Here, the casing 35 is installed above the water storage tank 41. The casing 35 forms a substantially closed space that includes the water supply port 31b and the connection port 41a with the water storage tank 41.

[0039] The operation of the pressure pump 42 is also controlled by the controller based on the flush water level inside the water storage tank 41 detected by the float switch. For example, if the water level inside the casing 35 detected by the float switch is below a predetermined level, the solenoid valve of the valve unit 34 opens and the diaphragm valve also opens. This opens the water supply port 31b of the water supply nozzle 31a, and the supply of flush water to the water storage tank 41 from the water supply port 31b begins.

[0040] At the same time, the pressure pump 42 operates, and flush water inside the water storage tank 41 is pressure-fed from the pressure pump 42 to the main waterway of the toilet body 2, and then flows through the rim waterway and is supplied to the water outlet 23. As a result, the toilet is flushed by water being discharged from the water outlet 23 (rim spouting), a so-called "toilet flush with 100% rim water spouting" is performed. Then, when the level of flush water inside the water storage tank 41 reaches a predetermined water level, the solenoid valve of the valve unit 34 closes and the diaphragm valve closes. This closes the water supply port 31b and stops the pressure pump 42.

[0041] The flush water supply flow path 5 is a flow path that extends from the water storage tank 41 to the toilet body 2. The flush water supply flow path 5 is a flow path along which flush water pressurized by the pressure pump 42 flows towards the toilet body 2. The downstream end of the flush water supply flow path 5 is connected to the spout 23 via a rim water conduit. The flush water supply flow path 5 is provided with a water discharge end 51 at its downstream end. The flush water supply flow path 5 may also include a rim water conduit (not shown) of the toilet body 2.

[0042] The overflow flow path 6 is a flow path that allows flush water to overflow when the flush water supplied to the water storage tank 41 exceeds a specified water level WL1 (see FIG. 10). The overflow flow path 6 is formed by a throat pipe. Hereinafter, the overflow flow path 6 will be referred to as the "throat pipe." The throat pipe 6 has an upstream end 61, which will be described later, that extends between the water storage tank 41 and the water supply port 31b.

[0043] When an overflow occurs, at least a portion of the flush water from the water supply port 31b flows directly into one end 61a of the upstream end 61 of the throat pipe 6. One end 61a of the upstream end 61 of the throat pipe 6 opens below the water supply port 31b, and the other end opens into a water channel (not shown) through which flush water flows toward the toilet body 2.

[0044] <Water supply unit and throat pipe> Next, the water supply unit 3 and the throat pipe 6 will be described with reference to Figures 5 to 10. Figures 5 and 6 are schematic perspective views showing the water supply unit 3. Figures 7 and 9 are schematic perspective views showing the throat pipe 6. Figures 8 and 10 are schematic side cross-sectional views showing the water supply unit 3 and the throat pipe 6. Figures 7 and 8 are views showing the normal state of the throat pipe 6. Figures 9 and 10 are views showing the state when an overflow occurs in the throat pipe 6. Note that Figures 8 and 10 show a cross section taken along line AA in Figure 6.

[0045] As shown in Figures 5 and 6, the water supply unit 3 houses the upstream end 61 of the throat pipe 6, which is an overflow flow path, in the internal space of the casing 35. The water supply unit 3 also has an atmosphere open section 7. The atmosphere open section 7 is, for example, a rectangular opening formed on a predetermined outer surface 351 of the casing 35. The casing 35 of the water supply unit 3 is opened by the atmosphere open section 7 so that flush water can be discharged from inside the casing 35 of the water supply unit 3 when the level of flush water inside the water supply unit 3 exceeds a specified water level WL1 (see Figure 10).

[0046] As shown in Figures 7 and 8, the throat pipe 6, which is an overflow flow path, has an upstream end 61, a downstream end 62 (see Figure 4), a midway section 63 (see Figures 3 and 4), and a switching mechanism section 64. As described above, the upstream end 61 is the section of the throat pipe 6 that is located inside the casing 35 and extends between the water storage tank 41 and the water supply port 31b in a side view. The upstream end 61 has one end 61a that receives flush water W (W1, W2) from the water supply port 31b of the water supply pipe 31. One end 61a is the most upstream end of the throat pipe 6 and the upstream end 61, and opens upward.

[0047] One end 61a of the upstream end 61 partially or completely overlaps with the water supply port 31b in a plan view. Note that the upstream end 61 is not limited to being positioned so as to overlap with the water supply port 31b in a plan view; for example, if the water supply port 31b is provided on the side of the casing 35 and flush water W1 supplied from the water supply port 31b is discharged laterally from the water supply port 31b, the upstream end 61 and the water supply port 31b do not have to overlap in a plan view. In this case, the upstream end 61 is positioned at least vertically between the water storage tank 41 and the water supply port 31b in a side view.

[0048] The downstream end 62 is connected to the cleaning water supply flow path 5. The midway portion 63 is a flow path between the upstream end 61 and the downstream end 62 of the throat pipe 6.

[0049] The switching mechanism 64 is provided at the upstream end 61. As shown in Figures 7 and 8, the switching mechanism 64 comprises a water passage hole 65, a stay (not shown), a movable part 67, and a float 68. The water passage hole 65 is a hole formed in the lower part of the upstream end 61. The water passage hole 65 has a predetermined length along the flow direction of flush water W2 (see Figure 10) in the throat pipe 6. The water passage hole 65 also has a predetermined length in the direction perpendicular to the flow direction of flush water W2, allowing flush water W1 from the water supply port 31b to pass through.

[0050] The stay extends downward from the upstream end 61. The stay rotatably supports the movable part 67. The movable part 67 is formed in a shape corresponding to the water passage hole 65. The movable part 67 is shaped to close the water passage hole 65, for example, by rotating upward around a rotation axis described below as a fulcrum. The movable part 67 has an interlocking piece 671 on the surface that becomes the outer side of the throat pipe 6. The interlocking piece 671 is formed integrally with the outer surface of the movable part 67. The movable part 67 is rotatable around the rotation axis as a fulcrum.

[0051] The float 68 is provided so that it can move linearly in the vertical direction. When an overflow occurs in which flush water W1 is not supplied from the water storage tank 41 to the toilet body 2 side and the water level WL2 (see Figure 10) of the flush water W inside the casing 35 rises, the float 68 rises by buoyancy in accordance with the water level WL2.

[0052] As shown in Figure 8, when float 68 rises, movable part 67 rotates upward in response to the rise of float 68. As a result, movable part 67 closes water hole 65 to form throat pipe 6. When throat pipe 6 is formed, flush water W1 (see Figure 8) from water supply port 31b flows through throat pipe 6 and is supplied to water outlet 23 (see Figure 1), and is discharged from water outlet 23 into the interior of bowl portion 21 (see Figure 1).

[0053] When the throat pipe 6 is formed, the cleaning water W1 inside the casing 35 is also supplied to the throat pipe 6 from one end 61a of the upstream end 61.

[0054] 8, when the float 68 that has risen descends, the movable part 67 rotates downward in response to the descent of the float 68. As a result, the movable part 67 opens the water passage hole 65.

[0055] In this way, when an overflow occurs, the shape of the switching mechanism 64 changes so that it receives the flush water W1 from the water supply port 31b at a higher position compared to normal times when no overflow is occurring, i.e., the position of the movable part 67 changes to form the throat pipe 6. In this case, the position of the movable part 67 changes to form the throat pipe 6 due to the float 68 moving up and down according to the water level WL2 of the flush water W inside the water storage tank 41.

[0056] When an overflow occurs, the switching mechanism 64 maintains its position with the throat pipe 6 formed by the water force (water pressure) of the flush water W2 supplied from the water supply port 31b.

[0057] Furthermore, when the movable part 67 closes the water passage hole 65 upon overflow, it is preferable that the upstream end of the movable part 67 is located inside the throat pipe 6 and the downstream end of the movable part 67 is located outside the throat pipe 6. Furthermore, a resin packing may be provided on the upstream and downstream ends of the movable part 67. This makes it possible to more reliably prevent water leakage from the connection between the water passage hole 65 and the movable part 67.

[0058] The water supply unit 3 also includes a water flow changer 8 (81). The water flow changer 8 (81) changes the flow of flush water W1 discharged from the water supply port 31b of the water supply unit 3 into the tank device D. T In other words, the direction of the flow of flush water W1 stored in the internal space of the casing 35 of the water supply unit 3 toward the water surface is changed.

[0059] <Water flow change section> Next, the water flow changing section 81 will be explained with reference to Figures 11 to 14. Figure 11 is a schematic plan view showing the throat pipe 6 and water flow changing section 81. Figure 12 is a schematic side view showing the throat pipe 6 and water flow changing section 81. Figure 13 is an explanatory diagram of the flow of flush water W in a flush toilet 1 according to an embodiment. Figure 14 is an explanatory diagram of the flow of flush water W in a flush toilet according to a comparative example.

[0060] 11 and 12, the water flow changing section 81 includes a rib-shaped rib portion 84. The water flow changing section 81 is disposed inside the casing 35 of the water supply unit 3. The water flow changing section 81 includes a base portion 83, a rib portion 84, a flange portion 85, and a hole portion 86. The base portion 83 is formed in an annular shape and is attached to one end portion 61a of the upstream end portion 61 of the throat pipe 6. A plurality of (for example, four) rib portions 84 are disposed on the base portion 83 at predetermined intervals from each other and are provided so as to rise upward from the base portion 83.

[0061] The flange portion 85 is provided on the upper part of the rib portion 84. The flange portion 85 has a circular hole portion 86 formed in the center in a plan view. The flange portion 85 is formed in a flange shape with the hole portion 36 as the center. A front surface 851 of the flange portion 85 is a surface that curves convexly downward as it approaches the hole portion 86. In addition, a back surface 852 of the flange portion 85 is a surface that curves concavely as it approaches from the hole portion 36 toward the outer edge of the flange portion 85.

[0062] As shown in Figure 11, the water flow changing section 81 is positioned in a plan view such that the center P3 of the hole 86 is shifted toward the curved surface 611 (see Figure 13) from the center P2 of one end 61a of the throat pipe 6. As shown in Figure 8, the throat pipe 6 is positioned in a plan view such that the center P2 of one end 61a of the throat pipe 6 is shifted from the center P1 of the water supply port 31b and the curved surface 611 of the throat pipe 6 is located directly below the center P1 of the water supply port 31b.

[0063] 12, in a side view, the hole 86, which is the lower end of the water flow changing section 81, is spaced apart from the one end 61a of the throat pipe 6. The water flow changing section 81 is arranged with the hole 86 spaced a predetermined distance D1 from the one end 61a of the throat pipe 6.

[0064] Furthermore, the water supply unit 3 is detachably attached to a supply port, which is an opening of the water storage tank 41. The water supply unit 3 is attached so that the water storage tank 41 communicates with the internal space of the casing 35. Furthermore, the volume of the internal space of the casing 35 of the water supply unit 3 is smaller than the volume of the water storage tank 41.

[0065] As shown in Figure 13, the water flow changing section 81 changes the direction of flow of flush water W discharged from the water supply port 31b (see Figures 8 and 10) of the water supply unit 3, towards the water surface of flush water W1 stored in the internal space of the casing 35 (see Figures 8 and 10) of the water supply unit 3. Specifically, when flush water W flows from one end 61a of the throat pipe 6 into the inside of the throat pipe 6, an upward reverse flow occurs. However, in the water flow changing section 81, the upward reverse flow of flush water W is suppressed by the flange portion 85, and its direction is changed to a lateral direction by the concavely curved back surface 852 of the flange portion 85.

[0066] In contrast to this, in a comparative example in which a water flow changing section 81 as shown in Figure 14 is not provided, when flush water W flows from one end 61a of throat pipe 6 into the inside of throat pipe 6, it flows back up. The backflowing flush water W reaches the surface of flush water W without changing its flow direction. This causes the surface of flush water W inside water supply unit 3 to ripple, and there is a risk that the ripples on the water surface may cause splashing.

[0067] Thus, according to the water flow change section 81 of the embodiment, by changing the direction of the flow towards the surface of the flush water W stored in the water supply unit 3 (casing 35) using the water flow change section 81, it is possible to stabilize the water level WL of the flush water W inside the water supply unit 3. This makes it possible to reduce rippling on the surface of the flush water W inside the water supply unit 3 and water splashing caused by the rippling, and it is possible to reduce, for example, the occurrence of water leakage outside the machine due to rippling on the surface of the flush water W and water splashing caused by the rippling, and the occurrence of flush water W coming into contact with the water supply port 31b.

[0068] 13, throat pipe 6 has curved surface 611 that is curved so as to send flush water W from water supply port 31b downstream of throat pipe 6, so that when flush water W discharged from water supply port 31b flows into throat pipe 6, flange portion 85 can suppress the flow of flush water W that flows back from the inside of throat pipe 6 to the outside of throat pipe 6 at the surface opposite curved surface 611. This makes it possible to suppress rippling of the surface of flush water W inside water supply unit 3 and water splashing due to rippling, and can suppress leakage outside the machine due to rippling of the surface of flush water W and water splashing due to rippling, and contact of flush water W with water supply port 31b.

[0069] Furthermore, the rib portions 84 of the water flow changing section 81 can change the direction of the flow of the flush water W towards the surface without completely blocking the flow of the flush water W. Furthermore, by arranging the water flow changing section 81 inside the water supply unit 3, it is possible to stabilize the level of the flush water W inside the water supply unit 3, which is a small space where rippling is more likely to occur, and it is also possible to stabilize the level WL of the flush water W in the water supply unit 3, which is located close to the water supply port 31b. This makes it possible to reduce rippling on the surface of the flush water W inside the water supply unit 3 and water splashing caused by the rippling, and to reduce, for example, the occurrence of water leakage outside the machine due to rippling on the surface of the flush water W and water splashing caused by the rippling, and the occurrence of flush water W coming into contact with the water supply port 31b.

[0070] Furthermore, when flush water W discharged from water supply port 31b flows into throat pipe 6, the flow of flush water W flowing back from the inside of throat pipe 6 to the outside of throat pipe 6 can be suppressed by flange portion 85 even at a position where the flow is strong on the opposite side of curved surface 611. This makes it possible to suppress rippling of the surface of flush water W inside water supply unit 3 and water splashing due to rippling, and can suppress, for example, leakage outside the machine due to rippling of the surface of flush water W and water splashing due to rippling, and contact of flush water W with water supply port 31b.

[0071] Furthermore, by forming the flange portion 85 in a so-called cone-like curve facing the hole portion 86, the curved surface 851 of the flange portion 85 can guide the flush water W from the water supply port 31b to the one end 61a which becomes the inlet of the throat pipe 6. Furthermore, the curved back surface 852 of the flange portion 85 can suppress the flow of flush water W flowing back from the inside of the throat pipe 6 to the outside of the throat pipe 6 by gradually attenuating the momentum of the flow.

[0072] Furthermore, since the hole 86, which is the lower end of the water flow changing section 81, is separated from one end 61a of the throat pipe 6 when viewed from the side, the flow of the cleaning water W flowing back from the inside of the throat pipe 6 to the outside of the throat pipe 6 can be changed in direction toward the water surface without stagnating at the flange section 85.

[0073] <Other embodiments> Next, a flush toilet according to another embodiment will be explained with reference to Figures 15 and 16. Figure 15 is an explanatory diagram of the flow of flush water in a flush toilet according to another embodiment. Figure 16 is an explanatory diagram of the flow of flush water in a flush toilet according to a comparative example.

[0074] As shown in Figure 15, a flush toilet according to another embodiment is provided with a rib portion 82 as a water flow changer 8. The rib portion 82 is provided so as to protrude laterally on the inner circumferential surface of the water storage tank 41 of the water storage unit 4. The rib portion 82 may also be provided around the entire periphery of the inner circumferential surface of the water storage tank 41. By providing such a rib portion 82, the direction of the flow of flush water W that is supplied from the water supply port 31b of the water supply pipe 31 of the water supply unit 3 and stored in the water storage tank 41 towards the water surface can be changed, for example, to the side.

[0075] In contrast to this, in a comparative example in which the rib portion 82 that is the water flow changing portion 8 as shown in Figure 16 is not provided, the flush water W supplied from the water supply port 31b flows backward so as to rise inside the water storage tank 41. The backward flowing flush water W reaches the surface of the flush water W without changing its direction of flow. This causes the surface of the flush water W inside the water storage tank 41 to ripple, and there is a risk that the ripples on the water surface will cause splashing.

[0076] In this way, in another embodiment, the direction of the flow towards the surface of the flush water W stored in the water storage tank 41 can be changed, and therefore the water level WL of the flush water W inside the water storage tank 41 can be stabilized. This makes it possible to reduce rippling on the surface of the flush water W inside the water storage tank 41 and water splashing caused by rippling, and can reduce, for example, the occurrence of water leakage outside the machine due to rippling on the surface of the flush water W and water splashing caused by rippling, and the occurrence of flush water W coming into contact with the water supply port 31b.

[0077] The rib portions 82 may be provided on only a portion of the inner circumferential surface of the water storage tank 41. Alternatively, the rib portions 82 may be provided intermittently on the inner circumferential surface of the water storage tank 41. Alternatively, the rib portions 82 may be provided only near the position where flush water W from the water supply port 31b lands.

[0078] Even with the provision of such rib portions 82, it is possible to change the direction of the flow towards the surface of the flush water W stored in the water storage tank 41. This makes it possible to stabilize the water level WL of the flush water W inside the water storage tank 41. This makes it possible to reduce rippling on the surface of the flush water W inside the water storage tank 41 and water splashing caused by the rippling, and it is possible to reduce, for example, the occurrence of water leakage outside the machine due to rippling on the surface of the flush water W and water splashing caused by the rippling, and the occurrence of flush water W coming into contact with the water supply port 31b.

[0079] In the above embodiment, a straightening net may be provided at water supply port 31b of water supply unit 3. This straightens the flush water from water supply port 31b, making it possible to prevent, for example, water from splashing sideways from water supply port 31b.

[0080] 7 and 9, the water supply unit 3 may also be provided with a plate-shaped shielding member 91 inside the casing 35. The shielding member 91 is arranged between the water supply port 31b and the atmosphere open section 7 (see FIG. 5). The shielding member 91 may be arranged inside the casing 35 with its lower end fixed to the upstream end 61 of the throat pipe 6. By providing such a shielding member 91, even if, for example, scale adheres near the water supply port 31b and water splashes sideways from the water supply port 31b, the shielding member 91 can block the sideways water splashing. This makes it possible to prevent external leakage of cleaning water from the atmosphere open section 7 to the outside of the water supply unit 3.

[0081] Further advantages and modifications will readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents. [Explanation of symbols]

[0082] 1 flush toilet 2 Toilet body 3 Water supply unit 4 Water storage unit 6 throat tube 8 Water flow change section 21 Bowl section 23 Outlet 24 Drain trap section 31b Water supply port 41 Water Tank 61a One end 84 Rib section 85 flange 86 Hole 611 Curved Surface D T Tank equipment P1 center P2 center P3 center W Cleaning water WL1 Specified water level WL2 water level

Claims

1. a toilet body having a bowl portion for receiving waste, a water outlet for discharging flushing water toward the bowl portion, and a drain trap portion forming part of a drainage flow path for discharging the waste received in the bowl portion by flushing water from the water outlet; a tank device having a water storage unit that stores flush water to be supplied to the toilet body, and a water supply unit that is disposed above the water storage unit and supplies flush water to the water storage unit; Equipped with The tank device has a water flow changer that changes the direction of flow of flush water discharged from the water supply port of the water supply unit toward the water surface of the flush water stored in the tank device. A flush toilet characterized by:

2. the water storage unit has an opening formed therein through which flush water is supplied from the water supply unit, and a water storage tank that stores flush water to be supplied to the toilet body; the water supply unit is detachably attached to the opening of the water storage tank, the internal space of the water supply unit is in communication with the water storage tank, and the volume of the water supply unit is smaller than that of the water storage tank; The water flow changer has a rib portion formed in a rib shape and is disposed inside the water supply unit.

2. The flush toilet according to claim 1.

3. The water supply unit has a throat pipe whose one end opens below the water supply port and whose other end opens in a water channel through which flush water flows toward the toilet body, the throat pipe has a curved surface that is curved so as to receive flush water from the water supply port and send the received flush water to the downstream side of the throat pipe, The water flow changing portion has a flange portion formed in a flange shape with the hole portion as the center, and is disposed at the one end of the throat pipe.

3. The flush toilet according to claim 2.

4. The throat pipe is arranged so that, in a plan view, the center of the one end is shifted from the center of the water supply port and the curved surface is located directly below the center of the water supply port, The water flow changing portion is disposed such that the center of the hole is shifted toward the curved surface side from the center of the one end portion in a plan view.

4. The flush toilet according to claim 3.

5. The water flow changing portion is a surface that curves downward as the flange portion approaches the hole portion.

5. The flush toilet according to claim 4.

6. The water flow changing portion has a lower end portion spaced apart from the one end portion of the throat pipe in a side view.

6. The flush toilet according to claim 5.

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