Water-washable toilet

Abstract

To provide a flush toilet that can sufficiently reduce the risk of overflow water flowing back into the flush water tank. [Solution] The present invention relates to a flush toilet (1), comprising a flush toilet body (2) having a bowl (12), a flush water tank (42), an overflow pipe (62) that discharges flush water when the flush water in the flush water tank exceeds a predetermined level, a drainage channel (30) that guides the wastewater discharged from the bowl, and a drainage pipe connection (30b) provided at the downstream end of the drainage channel and connected to a drainage pipe, wherein at least a part of the drainage channel is provided with a parallel channel section (66b) having a first channel section (70a) through which the wastewater discharged from the bowl flows, and a second channel section (70b) formed parallel to the first channel section, the overflow pipe is connected to the parallel channel section, and the flush water that flows into the overflow pipe is discharged into the second channel section of the parallel channel section.

Description

Technical Field

[0004] , , , , , , ,

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is cleaned using the cleaning water in a cleaning water tank.

Background Art

[0002] Japanese Patent No. 7181505 (Patent Document 1) describes a flush toilet. This flush toilet includes a bowl portion, a toilet body having a drain trap pipe, a water storage tank, a water supply valve unit, a pump device, etc. Then, the cleaning water in the water storage tank is pressurized by the pump device and discharged from the jet discharge port, and at the same time, the cleaning water is discharged from the rim discharge port through the water supply valve unit to clean the bowl portion. Further, an overflow bypass flow path extends from the upper part of the water storage tank, and this overflow bypass flow path is connected to the vertical pipe portion of a drain socket connected to the downstream side of the drain trap pipe. Therefore, when the water level in the water storage tank exceeds a predetermined water level, the cleaning water is discharged into the drain socket through the overflow bypass flow path.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the flush toilet described in Patent Document 1, the overflow bypass channel extending from the water storage tank is connected to the vertical pipe section of the drain socket. As a result, there is a risk that the flushing water that flows from the bowl through the drain trap pipe to the drain socket will flow back into the overflow bypass channel connected to the drain socket. In particular, if the cross-sectional area of ​​the overflow bypass channel is increased to enable the discharge of a large volume of overflow water from the water storage tank, there is a problem that the risk of flushing water flowing back into the overflow bypass channel from the drain socket increases. Furthermore, if a blockage occurs in the drain piping connected downstream of the drain socket, there is a problem that the risk of flushing water flowing back into the overflow bypass channel from the drain socket also increases.

[0005] Therefore, the present invention aims to provide a flush toilet that can discharge a large volume of overflow water from the flush water tank while sufficiently reducing the risk of backflow of flush water into the flush water tank. [Means for solving the problem]

[0006] To solve the above-mentioned problems, the present invention provides a flush toilet that is cleaned using flush water in a flush water tank, comprising: a flush toilet body having a bowl portion for receiving waste; a flush water tank having at least a portion disposed inside the flush toilet body for storing flush water for cleaning the bowl portion; an overflow pipe that discharges flush water when the flush water in the flush water tank exceeds a predetermined level; a drainage channel that guides the wastewater discharged from the bowl portion; and a drainage pipe connection provided at the downstream end of the drainage channel and connected to a drainage pipe, wherein at least a portion of the drainage channel is provided with a parallel channel portion comprising a first channel portion through which the wastewater discharged from the bowl portion flows, and a second channel portion formed parallel to the first channel portion, the overflow pipe is connected to the parallel channel portion, and the flush water that flows into the overflow pipe is discharged into the second channel portion of the parallel channel portion.

[0007] According to the present invention configured in this way, a parallel flow channel is provided in the drainage channel, and the drainage channel comprises a first flow channel and a second flow channel formed parallel thereto. The cleaning water that flows into the overflow pipe is discharged into the second flow channel of the parallel flow channel. For this reason, the cleaning water discharged from the bowl flows directly into the drainage pipe through the first flow channel of the parallel flow channel and is less likely to flow into the second flow channel formed parallel to the first flow channel. Therefore, the risk of cleaning water discharged from the bowl flowing back into the overflow pipe can be sufficiently reduced.

[0008] In the present invention, preferably, the toilet bowl body is provided with a drain trap pipe extending from below the bowl, and the parallel flow path of the drain channel is provided on the downstream side of the drain trap pipe.

[0009] According to the present invention configured in this way, since a parallel flow channel is provided on the downstream side of the drain trap pipe, the overflow water discharged into the second flow channel of the parallel flow channel does not flow towards the bowl section, and the overflow water can be quickly discharged into the drain pipe.

[0010] In the present invention, preferably, the inlet of the overflow pipe is located at a higher position than the outlet of the overflow pipe connected to the parallel flow path.

[0011] According to the present invention configured in this way, since the inlet of the overflow pipe is located higher than the outlet of the overflow pipe connected to the parallel flow channel, even if the drainage pipe becomes clogged, it is difficult for the backflowing cleaning water to reach the cleaning water tank, and the risk of cleaning water backflowing from the parallel flow channel to the cleaning water tank can be further reduced.

[0012] In the present invention, preferably, the second flow channel of the parallel flow channel is formed at least a portion above the first flow channel, and the outlet of the overflow pipe is connected above the first flow channel.

[0013] With the present invention configured in this way, at least a portion of the second flow channel is formed above the first flow channel, and the outlet of the overflow pipe is connected above the first flow channel. Therefore, the cleaning water that has flowed from the bowl to the first flow channel is less likely to enter the second flow channel, and the risk of cleaning water backflowing into the overflow pipe can be further reduced.

[0014] In the present invention, preferably, the flushing water tank and the parallel flow channel are arranged side by side in the width direction of the toilet body, and the overflow pipe extends to connect the top of the flushing water tank and the parallel flow channel.

[0015] According to the present invention configured in this way, the flushing water tank and the parallel flow channel are arranged side by side in the width direction of the toilet body, and the overflow pipe extends to connect the top of the flushing water tank and the parallel flow channel. Therefore, the flushing water tank and the parallel flow channel can be connected over a short distance by the overflow pipe, and a large flow rate of flushing water from the flushing water tank can be discharged into the parallel flow channel.

[0016] In the present invention, preferably, the inlet of the overflow pipe is provided with a pest-blocking section to prevent pests from entering from the drainage pipe.

[0017] With the present invention configured in this way, since a pest-blocking section is provided at the inlet of the overflow pipe, it is possible to prevent pests from entering the washing water tank from the drainage pipe.

[0018] In the present invention, preferably, the parallel flow channel section is configured such that all portions of its cross-sectional area other than the first flow channel section through which wastewater discharged from the bowl section flows constitute the second flow channel section.

[0019] According to the present invention configured as described above, in the flow path cross-section of the parallel flow path portion, all portions other than the first flow path portion through which the drainage water flowing out from the bowl portion flows constitute the second flow path portion. Therefore, a sufficient flow path cross-sectional area for flowing the overflow water discharged from the overflow pipe can be secured, and a large flow rate of overflow water can be discharged to the drainage pipe.

[0020] In the present invention, preferably, in the parallel flow path portion, a flow path opening communicating with the second flow path portion is formed, and a lid portion covering this flow path opening is attached thereto. The lid portion is provided with an overflow pipe connection portion for connecting the outlet of the overflow pipe, and the position of the overflow pipe connection portion can be changed by changing the direction in which the lid portion is attached.

[0021] According to the present invention configured as described above, the lid portion covering the flow path opening communicating with the second flow path portion of the parallel flow path portion is configured such that the position of the overflow pipe connection portion can be changed by changing the attachment direction. Therefore, even for models with different positional relationships between the cleaning water tank and the parallel flow path portion, the cleaning water tank and the parallel flow path portion can be connected by the shortest overflow pipe only by changing the attachment direction of the lid portion.

Effect of the Invention

[0022] According to the water-washing toilet of the present invention, while enabling the discharge of a large flow rate of overflow water from the cleaning water tank, the risk of backflow of the cleaning water to the cleaning water tank side can be sufficiently reduced.

Brief Description of the Drawings

[0023] [Figure 1] It is a perspective view showing a water-washing toilet according to an embodiment of the present invention. [Figure 2] It is a top view showing the water-washing toilet according to an embodiment of the present invention with the sanitary cleaning device removed. [Figure 3] It is a side cross-sectional view of the water-washing toilet according to an embodiment of the present invention cut along the line III-III in FIG. 2. [Figure 4A] The perspective view of the functional device of the water-washed toilet according to the embodiment of the present invention, seen from the upper left obliquely. [Figure 4B] The perspective view of the functional device of the water-washed toilet according to the embodiment of the present invention, seen from the upper right obliquely. [Figure 5] The block diagram showing the water supply path through which the washing water of the water-washed toilet according to the embodiment of the present invention flows. [Figure 6] In the water-washed toilet according to the embodiment of the present invention, it is a perspective view showing the drainage socket, the washing water tank, and the overflow pipe taken out. [Figure 7] In the water-washed toilet according to the embodiment of the present invention, it is a perspective cross-sectional view showing the structure of the flow path in the drainage socket. [Figure 8] In the water-washed toilet according to the embodiment of the present invention, it is a cross-sectional view of the washing water tank showing the connection structure between the washing water tank and the overflow pipe. [Figure 9] In the water-washed toilet according to the embodiment of the present invention, it is a perspective view showing the pest prevention part provided at the inlet of the overflow pipe.

Embodiments for Carrying out the Invention

[0024] Hereinafter, referring to the accompanying drawings, the water-washed toilet according to the embodiment of the present invention will be described. First, the basic structure of the water-washed toilet according to the embodiment of the present invention will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view showing the water-washed toilet according to the embodiment of the present invention, FIG. 2 is a top view of the state where the sanitary washing device of the water-washed toilet according to the embodiment of the present invention is removed, and FIG. 3 is a side cross-sectional view seen along the line III-III of FIG. 2. In FIG. 2, the rim water supply path, the jet water supply path, and the water supply pipe for the jet are shown by dotted lines.

[0025] As shown in Figure 1, the flush toilet 1 according to an embodiment of the present invention is a wall-mounted flush toilet whose back surface is fixed to a wall W. The flush toilet 1 comprises a ceramic flush toilet body 2, a tank device 4 for storing flushing water supplied to the flush toilet body 2, and a sanitary flushing device 6 mounted on the upper surface of the flush toilet body 2. The wall W is provided with a shut-off valve 8 for supplying or stopping the flow of flushing water from a water source (not shown), such as a water supply, to the flush toilet 1. This shut-off valve 8 is connected to the flush toilet 1 via a water supply pipe 10.

[0026] As shown in Figures 2 and 3, the toilet bowl body 2 has a bowl portion 12 for receiving waste, a drain trap pipe 14 connected below the bowl portion 12 for discharging waste, and a skirt portion 16 that surrounds the bowl portion 12 and the drain trap pipe 14 from the outside. A space S is formed inside the toilet bowl body 2 between the bowl portion 12 and the drain trap pipe 14 and the skirt portion 16.

[0027] The bowl portion 12 comprises a bowl-shaped waste receiving surface 18 and a rim portion 20 formed along the upper edge of the bowl portion 12. Water is formed inside the bowl portion 12.

[0028] The rim portion 20 has a rim outlet 22 for discharging cleaning water towards the rear and a rim water channel 24 for guiding the cleaning water to the rim outlet 22. The rim outlet 22 is located near the center in the front-to-back direction on the right side of the bowl portion 12. The cleaning water discharged from the rim outlet 22 flows down the waste receiving surface 18 while swirling along the inner circumferential surface of the rim portion 20, cleaning the bowl portion 12.

[0029] Below the bowl section 12, a jet outlet 26 is formed to discharge cleaning water toward the inlet 14a of the drain trap pipe 14, and a jet water channel 28 is formed to supply cleaning water to the jet outlet 26. The jet outlet 26 is positioned opposite the inlet 14a of the drain trap pipe 14. The cleaning water discharged from the jet outlet 26 flows into the drain trap pipe 14 to activate a siphon effect.

[0030] The flush toilet 1 according to an embodiment of the present invention is a siphon-jet type flush toilet that discharges waste by generating a siphon action through a jet of water. However, it is not limited to this form, and other forms may also be used, for example, a wash-down type flush toilet that washes away waste with the flowing water action caused by the difference in water pressure, or a siphon-type flush toilet that discharges waste by generating a siphon action solely through rim water discharge.

[0031] The drain trap pipe 14 comprises an inlet 14a connected to the bottom of the bowl section 12, an upward pipe 14b extending upward from the inlet 14a, a top 14c located at the highest point of the upward pipe 14b that defines the water level, and a rear pipe 14d extending almost horizontally backward from this top 14c. The rear pipe 14d of the drain trap pipe 14 is connected to a drain pipe (not shown) inside the wall W via a drain socket 30. In this embodiment, the drain trap pipe 14 and the drain socket 30 constitute a drainage channel that guides the wastewater flowing out of the bowl section 12. The drain socket 30 located at the downstream end of the drainage channel is connected to a drain pipe (not shown).

[0032] The sanitary washing device 6 comprises a main body (not shown), a washing nozzle (not shown) that is movable forward and backward from the main body, a toilet seat (not shown) that is rotatably attached to the main body, and a toilet seat cover that is rotatably attached to the main body so as to cover the toilet seat. The water supply pipe 10, which is connected to the shut-off valve 8, is connected to the main body of the sanitary washing device 6 and supplies washing water to be sprayed from the washing nozzle.

[0033] As shown in Figures 2 and 3, a space S is formed within the toilet bowl body 2 between the bowl portion 12 and the drain trap pipe 14 and the skirt portion 16. The tank device 4 is housed in the space S surrounded by the skirt portion 16 below the bowl portion 12 within the toilet bowl body 2. Functional devices for supplying flushing water stored in the tank device to the toilet bowl body are housed in the space S behind the bowl portion 12 within the toilet bowl body 2. These functional devices include, for example, a water supply valve device 32, a pump device 34, a switching valve device 36, and a control device 38. A base plate 40 is provided in the bottom opening 2a surrounded by the skirt portion 16 of the toilet bowl body 2, and the above-mentioned functional devices are supported by this base plate 40.

[0034] Next, the tank device 4, functional device, and base plate 40 housed in the space S within the toilet bowl body 2 will be explained with reference to Figures 4A and 4B. Figure 4A is a perspective view of the functional device of a flush toilet according to an embodiment of the present invention, viewed from the upper left, and Figure 4B is a perspective view of the functional device of a flush toilet according to an embodiment of the present invention, viewed from the upper right, at an angle. In Figure 4A, the direction of the flow of flushing water is indicated by an arrow.

[0035] The tank device 4 includes a flush water tank 42 for storing flush water supplied to the toilet bowl body 2, a tank water supply unit 46 for allowing flush water from the tank water supply pipe 44 to flow into the flush water tank 42, a float switch 48 for detecting the water level of the flush water stored in the flush water tank 42, and a fixing member 50 for fixing the tank device 4 to the bottom surface of the toilet bowl body 2.

[0036] The flushing water tank 42 stores flushing water for cleaning the bowl portion 12. In a top view, it is formed in an L-shape, extending forward on the right side of the drain trap pipe 14, then bending and extending to the left. The flushing water tank 42 is a resin tank that stores flushing water used for rim discharge and jet discharge, and in this embodiment, the entire tank is located inside the toilet body 2. In this embodiment, the entire flushing water tank 42 is located inside the toilet body 2, but it is also acceptable for only a part of it to be located inside the toilet body 2.

[0037] The tank water supply unit 46 is located on top of the cleaning water tank 42. The upstream side of the tank water supply unit 46 is connected to the tank water supply pipe 44, and the downstream side of the tank water supply unit 46 is connected to the cleaning water tank 42. Inside the tank water supply unit 46, a flow path is formed to guide cleaning water from the tank water supply pipe 44 towards the cleaning water tank 42.

[0038] The float switch 48 is located above the flushing water tank 42. The float switch 48 is designed to turn off when the water level in the tank falls below the shut-off level (full water level). Conversely, the float switch 48 turns on when the water level in the tank rises to the shut-off level, causing the water supply valve device 32 to close.

[0039] The cleaning water tank 42 is equipped with an overflow pipe 62 for draining cleaning water outside the tank in case, for example, if the float switch 48 malfunctions and the tank continues to supply water. The overflow pipe 62 is connected to a drain socket 30, and when the cleaning water in the cleaning water tank 42 exceeds a predetermined level, the cleaning water is allowed to flow into the drain socket 30 via the overflow pipe 62.

[0040] The water supply valve device 32 includes a constant flow valve (not shown) for maintaining a constant flow rate of cleaning water, an on-off valve (not shown) located downstream of the constant flow valve for switching between supplying and shutting off cleaning water, and a solenoid valve (not shown) for driving this on-off valve. The upstream side of the water supply valve device 32 is connected to a water source (not shown) via a stopcock 8 and a water supply pipe 10, and the downstream side of the water supply valve device 32 is connected to the sanitary cleaning device 6 via a water supply pipe 52 for the sanitary cleaning device, and also to the tank device 4 via a water supply pipe 44 for the tank. When the solenoid valve opens electromagnetically, the on-off valve opens, and cleaning water from the water source is supplied to the tank device 4 via the water supply pipe 44 for the tank.

[0041] The pump device 34 is a pressurized pump that pumps the flushing water stored in the tank device 4 to the toilet bowl body 2. The upstream side of the pump device 34 is connected to the tank device 4 via an upstream connecting pipe 54, and the downstream side of the pump device 34 is connected to the switching valve device 36 via a downstream connecting pipe 56. When the pump device 34 is operated, the flushing water stored in the tank device 4 is pumped and discharged from the rim outlet 22 and the jet outlet 26, thereby flushing the toilet bowl. In this embodiment of the present invention, the flushing toilet bowl 1 is supplied with flushing water stored in the tank device 4 to the rim outlet 22 and the jet outlet 26, but the invention is not limited to this configuration, and other configurations are also applicable, such as a configuration in which all the flushing water stored in the tank device 4 is discharged from the rim outlet 22.

[0042] The switching valve device 36 includes a switching valve body (not shown) and switches the water supply channels that supply cleaning water from the pump device 34 to the rim discharge port 22 and the jet discharge port 26, respectively. The upstream side of the switching valve device 36 is connected to the pump device 34 via a downstream connecting pipe 56, and the downstream side of the switching valve device 36 is connected to the rim water supply channel 24 via a rim water supply pipe 58 and to the jet water supply channel 28 via a jet water supply pipe 60. When the switching valve body is closed, cleaning water from the pump device 34 is supplied to the rim discharge port 22, and when the switching valve body is open, cleaning water from the pump device 34 is supplied to both the rim discharge port 22 and the jet discharge port 26.

[0043] The control device 38 is electrically connected to a remote control (not shown), a tank device 4 (float switch 48), a sanitary cleaning device 6, a water supply valve device 32, and a pump device 34, and is capable of sending and receiving various signals. When the control device 38 receives a cleaning start signal for a large or small flush from the remote control, it drives or stops the pump device 34 based on a pre-stored cleaning sequence. Specifically, when the user operates the remote control, the control device 38 drives the pump device 34 to discharge the cleaning water stored in the tank device 4 from the rim outlet 22 and the jet outlet 26. In addition, after the toilet bowl is flushed, the control device 38 opens the water supply valve device 32 to supply water to the tank, and when the float switch 48 detects that the tank is full, it closes the water supply valve device 32.

[0044] Next, with reference to Figure 5, the water supply channel through which the flushing water of the flush toilet 1 according to an embodiment of the present invention flows will be described. Figure 5 is a block diagram showing the water supply channel through which the flushing water of a flush toilet according to an embodiment of the present invention flows.

[0045] The water supply channel of the flush toilet 1 is configured, from upstream, with a stopcock 8, a water supply valve device 32, a tank device 4, a pump device 34, and a switching valve device 36. First, flushing water is supplied from the water source to the water supply valve device 32 via the stopcock 8 and the water supply pipe 10. The flushing water supplied to the water supply valve device 32 is supplied to the sanitary flushing device 6 via the sanitary flushing device water supply pipe 52, and also to the tank device 4 via the tank water supply pipe 44. The flushing water stored in the tank device 4 is drawn up by the pump device 34 via the upstream connecting pipe 54 and supplied to the switching valve device 36 via the downstream connecting pipe 56. The flushing water supplied to the switching valve device 36 is discharged from the rim outlet 22 via the rim water supply pipe 58 and the rim water conduit 24, and also discharged from the jet outlet 26 via the jet water supply pipe 60 and the jet water conduit 28. Furthermore, the cleaning water that overflows from the tank device 4 is discharged to the drain socket 30 via the overflow pipe 62.

[0046] Next, with reference to Figures 6 to 9, the configuration of the drain socket 30 and the connection structure between the drain socket 30 and the cleaning water tank 42 will be described. Figure 6 is a perspective view showing the drain socket 30, the wash water tank 42, and the overflow pipe 62 connecting them. Figure 7 is a perspective cross-sectional view showing the structure of the flow path inside the drain socket 30. Figure 8 is a cross-sectional view of the wash water tank 42 showing the connection structure between the wash water tank 42 and the overflow pipe 62. Figure 9 is a perspective view showing the pest-blocking section provided at the inlet of the overflow pipe 62.

[0047] As shown in Figure 6, the drain socket 30 is connected to the highest part of the flush water tank 42 via an overflow pipe 62. In this embodiment, the overflow pipe 62 is made of a flexible hose, and the inlet 62a of the overflow pipe 62 is located higher than the outlet 62b. Furthermore, the drain socket 30 has an inlet portion 30a that opens toward the front of the flush toilet 1 and a drain pipe connection portion 30b that opens toward the rear. Overall, the drain socket 30 has a generally crank-shaped flow path, with the upper inlet portion 30a and the lower drain pipe connection portion 30b connected by a generally vertical flow path.

[0048] The inlet portion 30a of the drain socket 30 is connected to the downstream side of the drain trap pipe 14 by receiving the rear pipe 14d (Figure 3) of the drain trap pipe 14. On the other hand, the drain pipe connection portion 30b is connected to the drain pipe by being received into the drain pipe (not shown) for discharging washing water and waste. That is, the drain pipe connection portion 30b is provided at the downstream end of the drainage channel extending from the drain trap pipe 14.

[0049] Furthermore, as shown in Figure 7, in this embodiment, the drain socket 30 is composed of three members: an upstream member 64 provided with an inlet portion 30a, a downstream member 66 provided with a drain pipe connection portion 30b, and a cover portion 68 that covers the opening of the downstream member 66. As a modification, the upstream member 64 and the downstream member 66 can be made from a single integrated member, or the upstream member 64, the downstream member 66, and the cover portion 68 can be made from a single integrated member.

[0050] The upstream member 64 is a member that forms an L-shaped conduit overall, curving 90 degrees downward from the inlet portion 30a which is generally oriented horizontally. On the other hand, the downstream member 66 has a connecting portion 66a that connects to the upstream member 64, and a parallel flow channel section 66b having a double-pipe structure. The connecting portion 66a opens vertically upward and is connected to the downstream end of the upstream member 64. The parallel flow channel section 66b has a first flow channel section 70a that communicates with the connecting portion 66a, and a second flow channel section 70b that extends parallel to the first flow channel section 70a, and has a double-pipe structure that extends generally horizontally. That is, the parallel flow channel section 66b is composed of an inner pipe wall 66c and an outer pipe wall 66d that has a larger inner diameter than the inner pipe wall 66c, respectively, forming the first flow channel section 70a and the second flow channel section 70b.

[0051] The inner pipe wall 66c is a circular cross-section pipe having approximately the same flow path cross-sectional area as the connecting portion 66a. The first flow path section 70a formed by the inner pipe wall 66c is in communication with the inside of the bowl section 12 via the connecting portion 66a, the upstream member 64, and the drain trap pipeline 14. Therefore, the parallel flow path section 66b is provided downstream of the drain trap pipeline 14, and the wastewater flowing out of the bowl section 12 flows through the first flow path section 70a formed by the inner pipe wall 66c of the parallel flow path section 66b and is discharged into the drain pipe (not shown).

[0052] On the other hand, the outer pipe wall 66d is a circular cross-section pipe with a larger inner diameter than the inner pipe wall 66c, and is formed to surround the inner pipe wall 66c. The inner pipe wall 66c and the outer pipe wall 66d are integrated at their lower ends. Therefore, much of the second flow channel section 70b is formed above the first flow channel section 70a. The space inside the outer pipe wall 66d and outside the inner pipe wall 66c constitutes the second flow channel section 70b of the parallel flow channel section 66b.

[0053] Here, the inner diameter of the drain pipe (not shown) connected to the drain pipe connection portion 30b of the drain socket 30 is generally standardized, and the outer diameter of the drain pipe connection portion 30b (outer pipe wall 66d) is set to a dimension that conforms to this standard. In this embodiment, an inner pipe wall 66c with a flow path cross-sectional area that can ensure sufficient discharge performance of washing water and waste is arranged within the outer pipe wall 66d of this standardized outer diameter, and the space outside the inner pipe wall 66c is all utilized as the second flow path portion 70b. Thus, in this embodiment, all parts of the flow path cross-section of the parallel flow path portion 66b other than the first flow path portion 70a constitute the second flow path portion 70b, and sufficient discharge performance of overflow water is also ensured in the second flow path portion 70b.

[0054] Furthermore, as shown in Figure 6, the rear of the flushing water tank 42 and the parallel flow path section 66b of the drain socket 30 are arranged side by side in the width direction of the toilet body 2, and as will be described later, the overflow pipe 62 is connected to the parallel flow path section 66b of the drain socket 30. As a result, the overflow pipe 62 connects the flushing water tank 42 and the drain socket 30 over the shortest distance, and the overflow water flowing out of the overflow pipe 62 is discharged into the second flow path section 70b of the drain socket 30.

[0055] Furthermore, a rectangular flow channel opening 66e, which opens upward, is formed at the upstream end of the outer pipe wall 66d. This flow channel opening 66e communicates with the second flow channel section 70b inside the outer pipe wall 66d. A rectangular cover 68 is attached to the flow channel opening 66e so as to cover it, and the flow channel opening 66e is closed by the cover 68.

[0056] Furthermore, an overflow pipe connection portion 68a for connecting the overflow pipe 62 is provided at one end of the lid portion 68. This overflow pipe connection portion 68a is a cylindrical portion that protrudes upward from the lid portion 68 and is connected to the overflow pipe 62 by being inserted into the outlet 62b of the overflow pipe 62. In this way, the outlet 62b of the overflow pipe 62 is connected to the second flow path portion 70b above the first flow path portion 70a. The first flow path portion 70a (inner pipe wall 66c) provided inside the second flow path portion 70b extends downstream beyond the vertically downward projection plane of the outlet 62b of the overflow pipe 62.

[0057] In this embodiment, the downstream end of the inner pipe wall 66c terminates at the same position as the downstream end of the outer pipe wall 66d. In contrast, as a modification, the inner pipe wall 66c may terminate upstream of the downstream end of the outer pipe wall 66d. However, even in this case, it is preferable to set the termination position of the inner pipe wall 66c so that the first flow path section 70a is formed downstream of the vertically downward projection plane of the outlet 62b of the overflow pipe 62. This makes it possible to suppress the backflow of the cleaning water that has flowed from the overflow pipe 62 into the second flow path section 70b into the first flow path section 70a.

[0058] Furthermore, as described above, since the flow path opening 66e formed at the upstream end of the outer pipe wall 66d is rectangular, the cover portion 68 that covers it can be attached to the flow path opening 66e even if it is reversed left to right. In this embodiment, the overflow pipe connection portion 68a of the cover portion 68 is located on the right side when viewing the flush toilet 1 from the front, as shown in Figure 6. However, by changing the orientation in which the cover portion 68 is attached and reversing it left to right, the position of the overflow pipe connection portion 68a can also be changed (the overflow pipe connection portion 68a can be positioned on the left side). For this reason, the drain socket 30 can be easily adapted to flush toilets with different layouts of flush water tanks, etc. As a modified example, the parallel flow path portion 66b can be constructed from a single component without providing a detachable cover portion 68.

[0059] Next, referring to Figure 8, the connection structure between the cleaning water tank 42 and the overflow pipe 62 will be explained. As shown in Figure 6, an overflow pipe connection chamber 72 is provided above the rear of the cleaning water tank 42. This overflow pipe connection chamber 72 is a roughly cubic room and is configured to communicate watertightly with the internal space of the cleaning water tank 42. The inlet 62a of the overflow pipe 62 is watertightly connected to one side of the overflow pipe connection chamber 72.

[0060] Furthermore, as shown in Figure 8, a circular outlet hole 72a is provided on one side of the overflow pipe connection chamber 72, and the overflow water that flows out from this outlet hole 72a flows into the overflow pipe 62 from the inlet 62a of the overflow pipe 62. Therefore, when the cleaning water in the cleaning water tank 42 exceeds a predetermined water level, which is the height h of the lower end of the outlet hole 72a, the cleaning water in the cleaning water tank 42 flows out into the overflow pipe 62 as overflow water. Note that since the cleaning water tank 42 has a sealed structure, the cleaning water will not flow out of the cleaning water tank 42 until the water level in the cleaning water tank 42 exceeds the height h.

[0061] Furthermore, a descending pipe 74 is connected to the lower side of the overflow pipe connection chamber 72, extending vertically downward from the overflow pipe connection chamber 72. This descending pipe 74 is also watertightly connected to the bottom surface of the overflow pipe connection chamber 72, and the inside of the descending pipe 74 is in communication with the inside of the overflow pipe connection chamber 72. Therefore, when the water level in the cleaning water tank 42 rises, the water level in the descending pipe 74 also rises, and when the water level in the descending pipe 74 becomes higher than the bottom surface of the overflow pipe connection chamber 72, the cleaning water in the descending pipe 74 flows into the overflow pipe connection chamber 72.

[0062] Furthermore, the lower end of the descending pipe 74 extends to near the bottom surface of the cleaning water tank 42. On the other hand, a partition wall 42a is provided on the bottom surface of the cleaning water tank 42 so as to surround the lower end of the descending pipe 74. This partition wall 42a is formed to surround a part of the space inside the cleaning water tank 42. Therefore, even if the cleaning water in the cleaning water tank 42 is sucked out by the pump device 34, as shown in Figure 8, the cleaning water in the space surrounded by the partition wall 42a remains in the cleaning water tank 42. Also, since the upper end of the partition wall 42a is located above the lower end of the descending pipe 74, the lower end of the descending pipe 74 is always submerged in the cleaning water remaining inside the partition wall 42a. Therefore, although the internal space of the cleaning water tank 42 is in communication with the drainage piping (not shown) via the overflow pipe 62, odors from the drainage piping do not leak into the cleaning water tank 42 through the overflow pipe 62.

[0063] Next, referring to Figure 9, the insect-blocking section provided at the inlet of the overflow pipe 62 will be explained. Figure 9 is an enlarged perspective view showing the overflow pipe connection chamber 72 located at the top of the cleaning water tank 42.

[0064] As described above, an outflow hole 72a is provided on one side of the overflow pipe connection chamber 72, and the inlet 62a of the overflow pipe 62 is connected so as to surround this outflow hole 72a. Furthermore, as shown in Figure 9, a flapper valve 76, which is a pest-blocking part, is provided in the outflow hole 72a to open and close it. This flapper valve 76 has a disc-shaped flapper valve body 76a and a support shaft portion 76b for rotatably supporting it.

[0065] The flapper valve body 76a is a circular, plate-shaped member positioned to cover the outlet hole 72a. The support shaft 76b is a shaft connected above the flapper valve body 76a and is rotatably mounted horizontally on the side wall of the overflow pipe connection chamber 72. As a result, when there is no overflow from the outlet hole 72a, the flapper valve body 76a hangs down below the support shaft 76b due to its own weight, closing the outlet hole 72a. Therefore, even if pests enter through the overflow pipe 62 from the drainage piping (not shown), they are blocked by the flapper valve body 76a, preventing them from entering the wash water tank 42.

[0066] On the other hand, when the water level in the washing water tank 42 rises and exceeds the height h (Figure 8) of the lower end of the outflow hole 72a, the force of the outflowing washing water pushes the flapper valve body 76a, causing it to rotate around the pivot shaft 76b and open the flapper valve 76. As a result, the washing water in the washing water tank 42 flows into the overflow pipe 62 as overflow water. In this way, the pest prevention unit is configured to prevent the entry of pests, etc., from the drainage pipe (not shown) while allowing the outflow of overflow water. In this embodiment, a flapper valve 76 is provided as the pest prevention unit, but any member that prevents the entry of pests, etc., and allows the outflow of overflow water, such as an insect screen (not shown), can be provided as the pest prevention unit.

[0067] Next, the operation of the flush toilet 1 according to an embodiment of the present invention will be described. First, when the user operates the remote control (not shown) to perform toilet flushing, the pump device 34 and the switching valve device 36 are activated, and flushing water in the flushing water tank 42 is discharged from the rim outlet 22 and the jet outlet 26 according to a predetermined flushing sequence. As a result, the inside of the bowl 12 is flushed, and the waste and flushing water inside the bowl 12 flow into the drain socket 30 through the drain trap pipe 14. The waste and flushing water that have flowed into the drain socket 30 are discharged into the drain pipe (not shown) through the first flow channel 70a formed in the parallel flow channel section 66b. Here, the first flow channel 70a and the second flow channel 70b of the parallel flow channel section 66b are arranged in parallel, and the second flow channel 70b is provided above the first flow channel 70a, so that the backflow of waste and flushing water that has flowed out of the first flow channel 70a into the second flow channel 70b is suppressed.

[0068] Furthermore, when the toilet is flushed, the pump device 34 operates, drawing out the flushing water from the flushing water tank 42, causing the water level in the flushing water tank 42 to drop. However, the flushing water in the area enclosed by the partition wall 42a (Figure 8) within the flushing water tank 42 remains in the tank. As a result, the lower end of the descending pipe 74 installed inside the flushing water tank 42 remains submerged, and even though the flushing water in the flushing water tank 42 is being drawn out, odors from the drainage pipe (not shown) do not enter the flushing water tank 42 through the overflow pipe 62.

[0069] When the toilet flushing is complete, the tank water supply unit 46 is activated, and flushing water supplied from the water supply flows into the flushing water tank 42. If the water level in the flushing water tank 42 rises above the specified level due to a malfunction of the tank water supply unit 46 or any other reason, and becomes higher than the specified level (height h of the lower end of the outflow hole 72a (Figure 8)), the flapper valve 76 (Figure 9) is opened by the water pressure. As a result, the flushing water in the flushing water tank 42 flows into the overflow pipe 62 as overflow water.

[0070] The flushing water flowing into the overflow pipe 62 flows through the outlet 62b (Figure 7) of the overflow pipe 62 into the second flow channel 70b provided in the parallel flow channel section 66b of the drain socket 30. The flushing water flowing into the second flow channel 70b flows out into the drain pipe (not shown) through the drain pipe connection section 30b of the drain socket 30. As a result, even if a malfunction occurs in the tank water supply unit 46 or the like, the flushing water is discharged into the drain pipe (not shown) without leaking into the toilet room. In addition, since the overflow pipe 62 and the second flow channel section 70b have sufficient flow channel cross-sectional area, even if a large flow rate of overflow water is generated, it can be discharged into the drain pipe (not shown). Furthermore, since the first flow channel section 70a and the second flow channel section 70b formed in the parallel flow channel section 66b are arranged in parallel and discharge flushing water in the same direction, backflow of flushing water flowing out of the second flow channel section 70b into the first flow channel section 70a is suppressed.

[0071] On the other hand, if a blockage occurs in the drainage pipe (not shown) for any reason, wastewater may flow from the drainage pipe to the drain socket 30. Even in such a case, the second flow path section 70b is located above the first flow path section 70a, and the outlet 62b of the overflow pipe 62 is connected above the first flow path section 70a, so backflow of wastewater into the overflow pipe 62 can be suppressed. Furthermore, since the inlet 62a of the overflow pipe 62 is located higher than the outlet 62b, even if wastewater enters the overflow pipe 62, it can be suppressed from flowing back into the washing water tank 42 through the inlet 62a.

[0072] In the flush toilet 1 embodiment of the present invention, a parallel flow channel section 66b is provided in the drainage channel, and the drainage channel comprises a first flow channel section 70a and a second flow channel section 70b formed parallel thereto. The flushing water that flows into the overflow pipe 62 is discharged into the second flow channel section 70b of the parallel flow channel section 66b. Therefore, the flushing water discharged from the bowl section 12 flows directly into the drainage pipe through the first flow channel section 70a of the parallel flow channel section 66b and is unlikely to flow into the second flow channel section 70b formed parallel to the first flow channel section 70a. As a result, the risk of flushing water discharged from the bowl section 12 flowing back into the overflow pipe 62 can be sufficiently reduced.

[0073] Furthermore, according to the flush toilet 1 of this embodiment, since a parallel flow channel 66b is provided downstream of the drain trap pipe 14, the overflow water discharged into the second flow channel 70b of the parallel flow channel 66b does not flow towards the bowl section 12, and the overflow water can be quickly discharged into the drain pipe.

[0074] Furthermore, according to the flush toilet 1 of this embodiment, the inlet of the overflow pipe 62 is located higher than the outlet 62b of the overflow pipe 62 connected to the parallel flow channel 66b. Therefore, even if the drain pipe becomes clogged, it is difficult for the backflowing flush water to reach the flush water tank 42, further reducing the risk of flush water backflowing from the parallel flow channel 66b to the flush water tank 42.

[0075] Furthermore, according to the flush toilet 1 of this embodiment, at least a portion of the second flow channel 70b is formed above the first flow channel 70a, and the outlet 62b of the overflow pipe 62 is connected above the first flow channel 70a. Therefore, flushing water that has flowed from the bowl 12 to the first flow channel 70a is less likely to enter the second flow channel 70b, and the risk of backflow of flushing water into the overflow pipe 62 can be further reduced.

[0076] Furthermore, according to the flush toilet 1 of this embodiment, the flush water tank 42 and the parallel flow channel 66b are arranged side by side in the width direction of the flush toilet body 2, and the overflow pipe 62 extends to connect the upper part of the flush water tank 42 and the parallel flow channel 66b. As a result, the flush water tank 42 and the parallel flow channel 66b can be connected over a short distance by the overflow pipe 62, and a large flow rate of flush water from the flush water tank 42 can be discharged into the parallel flow channel 66b.

[0077] Furthermore, according to the flush toilet 1 of this embodiment, a flapper valve 76, which is a pest-blocking part, is provided at the inlet 62a of the overflow pipe 62, so that pests can be prevented from entering the flush water tank 42 from the drain pipe.

[0078] Furthermore, according to the flush toilet 1 of this embodiment, all parts of the flow path cross-section of the parallel flow path section 66b other than the first flow path section 70a through which the wastewater flowing out of the bowl section 12 flows constitute the second flow path section 70b. Therefore, a sufficient flow path cross-sectional area can be secured for the overflow water discharged from the overflow pipe 62, and a large volume of overflow water can be discharged into the drainage pipe.

[0079] Furthermore, according to the flush toilet 1 of this embodiment, the lid 68 that covers the flow path opening 66e communicating with the second flow path section 70b of the parallel flow path section 66b is configured such that the position of the overflow pipe connection section 68a can be changed by changing the orientation in which it is installed. Therefore, even for models where the relative positions of the flush water tank 42 and the parallel flow path section 66b are different, the flush water tank 42 and the parallel flow path section 66b can be connected with the shortest possible overflow pipe 62 simply by changing the installation direction of the lid 68.

[0080] Although embodiments of the present invention have been described above, various modifications can be made to the embodiments described above. In particular, in the embodiments described above, the parallel flow channel section 66b was configured as a double pipe with an inner pipe wall 66c and an outer pipe wall 66d having a circular cross-section, but the parallel flow channel section can be configured in any form that constitutes two parallel flow channels. For example, a partition wall may be provided inside the circular pipe, with one side of the partition wall designated as the first flow channel section and the other side as the first flow channel section.

[0081] Furthermore, in the above-described embodiment, a parallel flow channel section was formed by providing an inner pipe wall of constant thickness within an outer pipe wall. However, the entire space outside the inner pipe wall does not have to be designated as the second flow channel section; some of the space may be filled with a material. Moreover, in the above-described embodiment, the parallel flow channel section was provided in a resin drain socket, which was connected to a ceramic flush toilet body. In contrast, as a modification, one of the flow channels of the parallel flow channel section can be made of ceramic and the other flow channel section can be made of resin. For example, the first flow channel section through which wastewater flowing out of the bowl section flows can be formed integrally with the flush toilet body using ceramic, and the second flow channel section can be made of resin. [Explanation of symbols]

[0082] 1 flush toilet 2 Flush toilet body 2a Bottom opening 4 Tank equipment 6. Sanitary cleaning equipment 8. Shut-off valve 10 Water supply pipe 12 Bowl section 14. Drain trap pipeline (drainage channel) 14a Entrance 14b Ascent conduit 14c top 14d Rear conduit 16 Skirt section 18 Waste receiving surface 20 Rim section 22 Rim spout 24 Rim water conduit 26 Jet nozzle 28. Jet water conduit 30 Drain socket (drain channel) 30a Entrance 30b Drainage pipe connection 32 Water supply valve device 34 Pumping equipment 36. Switching valve device 38 Control device 40 base plate 42 Washing water tank 42a Partition wall 44 Water supply pipe for tank 46 Tank water supply unit 48 Float switch 50 Fixing member 52 Water supply pipe for sanitary cleaning equipment 54 Upstream connecting pipe 56 Downstream connecting pipe 58 Rim water supply pipe 60 Water supply pipe for jet 62 Overflow pipe 62a Entrance 62b exit 64 Upstream member 66 Downstream member 66a Connection part 66b Parallel channel section 66c inner tube wall 66d Outer tube wall 66e Flow channel opening 68 Lid 68a Overflow pipe connection 70a First channel section 70b Second channel section 72 Overflow pipe connection chamber 72a Outflow hole 74 Downcomer 76. Flapper valve (insect-blocking part) 76a Flapper valve body 76b Support shaft

Claims

1. A flush toilet that is cleaned using flush water in a flush water tank, A flush toilet body equipped with a bowl for receiving waste, At least a portion of the toilet bowl body is located inside the toilet bowl, and a flushing water tank is provided to store flushing water for cleaning the bowl. When the cleaning water in this cleaning water tank exceeds a predetermined level, an overflow pipe is used to discharge the cleaning water. A drainage channel for guiding the wastewater that flows out from the bowl section mentioned above, A drainage pipe connection section is provided at the downstream end of this drainage channel and is connected to the drainage pipe, It has, At least a portion of the drainage channel is provided with a parallel channel section comprising a first channel section through which the drainage flowing out of the bowl section flows, and a second channel section formed parallel to the first channel section. A flush toilet characterized in that the overflow pipe is connected to the parallel flow channel, and the flushing water that flows into the overflow pipe is discharged into the second flow channel of the parallel flow channel.

2. The flush toilet according to claim 1, wherein the flush toilet body is provided with a drain trap pipe extending from below the bowl portion, and the parallel flow path portion of the drain flow path is provided on the downstream side of the drain trap pipe.

3. The flush toilet according to claim 1, wherein the inlet of the overflow pipe is located at a higher position than the outlet of the overflow pipe connected to the parallel flow section.

4. The flush toilet according to claim 1, wherein at least a portion of the second flow channel of the parallel flow channel is formed above the first flow channel, and the outlet of the overflow pipe is connected above the first flow channel.

5. The flush toilet according to claim 1, wherein the flush water tank and the parallel flow channel are arranged side by side in the width direction of the flush toilet body, and the overflow pipe extends to connect the upper part of the flush water tank and the parallel flow channel.

6. The flush toilet according to claim 1, wherein the inlet of the overflow pipe is provided with an insect-blocking section to prevent insects from entering from the drain pipe.

7. The flush toilet according to claim 1, wherein the parallel flow channel section, with respect to its cross-section, consists entirely of the portion other than the first flow channel section through which the wastewater discharged from the bowl section flows, and constitutes the second flow channel section.

8. The parallel flow channel section has a flow channel opening that communicates with the second flow channel section, and a cover is attached to this flow channel opening. The cover is provided with an overflow pipe connection for connecting the outlet of the overflow pipe, and the position of the overflow pipe connection can be changed by changing the orientation in which the cover is attached. This is the flush toilet according to claim 1.

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