Flush toilet bowl

Abstract

To provide a flush toilet bowl capable of, while realizing making the flush toilet bowl low silhouette, curbing water leakage outside the bowl and surely minimizing a risk that a water supply part is submerged by overflowed cleaning water.SOLUTION: A flush toilet bowl 1 of the present invention comprises a toilet bowl body 2 and a cleaning water supply device 4 that supplies cleaning water to the toilet bowl body, where the cleaning water supply device includes: a water supply section 28 that supplies cleaning water W0 supplied from a water supply source 22; a water storage tank 30 disposed backward or below the toilet bowl body and retaining the cleaning water supplied from the water supply section; a pump 32 that suctions the cleaning water in the water storage tank 30 and flows it to the toilet bowl body; and plural overflow channels 40a, 28h that overflow cleaning water W2, W3 exceeding a specified water level WL1 in the water storage tank to different sites, where at least one channel of the plural overflow channels is disposed lower than a top face 8a of a rim part 8 of the toilet bowl body 2.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water to expel waste. [Background technology]

[0002] 2. Description of the Related Art Conventionally, flush toilets that are flushed with flush water to discharge waste are known to be equipped with a plurality of overflow flow paths, as described in Patent Documents 1 and 2, for example. First, the conventional flush toilet described in Patent Document 1 is a so-called "wall-hung flush toilet" in which the rear side of the toilet body is fixed to the wall surface, and is equipped with the toilet body and a flush water supply device which supplies flush water to the toilet body. In addition, this flushing water supply device is equipped with a water supply section that supplies flushing water supplied from a water supply source, a water storage tank that stores the flushing water supplied from this water supply section, and a pressurizing device that pressurizes the flushing water in the water storage tank toward the toilet body. The water storage tank further comprises a tank body and an auxiliary tank, which is provided in communication with the upper part of the tank body so that flushing water is supplied from the water supply unit. An overflow port is formed in the upper edge of the auxiliary tank, while a communication port that communicates with the tank body is formed in the bottom of the auxiliary tank, and a valve body (water stop ball) is provided in this communication port so as to be able to open and close. In addition, when the pressurizing device is not operating, the valve body opens the communication port of the auxiliary tank, and cleaning water supplied from the water supply section into the auxiliary tank is supplied from the communication port into the tank body. On the other hand, when the pressurizing device is activated, the flushing water in the tank body is pressurized by the pressurizing device and supplied into the toilet body through the supply pipe connecting the tank body and the toilet body, and since the valve body closes the communication port of the auxiliary tank, the flushing water in the auxiliary tank does not rise to the overflow port and does not overflow. Furthermore, in the conventional flush toilet described in Patent Document 1, if the flush water in the storage tank exceeds a specified water level due to a power outage or a malfunction of the pressurizing device, the flush water will overflow through two overflow paths: a path (first overflow path) that causes the flush water in the tank body to overflow from the supply pipe into the toilet body, and a path (second overflow path) that causes the flush water in the tank body to overflow from the communication port of the auxiliary tank, through the overflow port, and to the outside of the toilet body (so-called "outside the machine leakage").

[0003] Next, the conventional flush toilet described in Patent Document 2 is equipped with a tank device that supplies flush water to the toilet body, and this tank device comprises a tank body in which flush water is stored, a connection unit that is detachably attached to an opening at the top of the tank body, and a water supply section that supplies water to the connection unit. The connection unit is also formed with a first overflow port that allows flush water that has risen from the tank body into the connection unit to overflow to the outside, and this first overflow port is connected to the toilet body's discharge pipe via an overflow pipe. Furthermore, a second overflow port is formed above the first overflow port of the connection unit, connecting its internal space with the external space. This makes it possible to accommodate cases where, for example, in flush toilets that comply with European standards, it is necessary to provide a second overflow port that is open to the outside in addition to the first overflow port to which the overflow pipe is connected. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] European Patent No. 3196370 [Patent Document 2] Patent No. 722241 (Patent Publication No. 2020-51236) Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the conventional flush toilet described in Patent Document 1 mentioned above, if the toilet flushing operation is performed while the water supply section of the flush water supply device continues to supply water due to a malfunction or other reason, there is a problem that water may leak from the overflow port (second overflow flow path) of the auxiliary tank to the outside of the storage tank (external leakage). Furthermore, in the conventional flush toilet described in Patent Document 1 mentioned above, the first overflow flow path, which allows flush water in the tank body to overflow from the supply pipe into the toilet body, has the problem that it is unable to perform its overflow function when the toilet is flushed, because it is essentially a flush water flow path used for flushing. Next, in the conventional flush toilet described in Patent Document 2 mentioned above, both the first overflow port and the second overflow port are positioned above the top surface of the rim part of the toilet body, which poses the problem of being a factor preventing the flush toilet from achieving a low silhouette as a whole. Furthermore, in the conventional flush toilet described in Patent Document 2 mentioned above, if the water level in the tank body exceeds the specified water level and rises into the connecting unit, causing flush water to overflow from both the first overflow port and the second overflow port, there is a problem in that the water supply section of the tank device may become submerged. Furthermore, in the conventional flush toilet described in Patent Document 2 mentioned above, if a functional part containing electronic components, such as a warm water washing toilet seat device equipped with a private part cleaning device that cleans the user's private parts, is located above the upper surface of the rim part of the toilet body, there is a problem that the electronic components may become wet and cause an electric leak due to flush water leaking from the connection part of the first overflow flow path due to aging, or flush water leaking outside the machine from the second overflow port. Therefore, in recent years, a pressing issue has been how to achieve a low silhouette for the entire flush toilet, while also suppressing water leakage outside the machine and reducing the risk of the water supply section of the flush water supply device becoming submerged due to overflowing flush water.

[0006] Therefore, the present invention has been made to solve the problems with the conventional technology described above and the issues that have been required in recent years, and has the object of providing a flush toilet that achieves a low silhouette, suppresses water leakage outside the machine, and reliably reduces the risk of the water supply section becoming submerged by overflow flush water. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems, the present invention provides a flush toilet that is flushed with flush water to discharge waste, comprising a toilet body having a bowl portion for receiving waste, a rim portion formed on the upper edge of the bowl portion, and a drain trap pipe for discharging the waste within the bowl portion, and a flush water supply device for supplying flush water to the toilet body, the flush water supply device comprising a water supply section for supplying flush water supplied from a water supply source, a water storage tank provided behind or below the toilet body and for storing the flush water supplied from the water supply section, a pump for sucking in the flush water in the storage tank and flowing it into the toilet body, and a number of overflow paths for overflowing flush water that exceeds a specified water level in the storage tank to different locations, and is characterized in that at least one of the multiple overflow paths is positioned below the upper surface of the rim portion. In the present invention configured in this manner, the flushing water supply device is provided with multiple overflow paths that allow flushing water that exceeds a specified water level in the water tank to overflow to different locations, and at least one of these multiple overflow paths can be positioned below the upper surface of the rim portion of the toilet body. This ensures that even if the flush water level in the storage tank of the flush water supply device located behind or below the toilet body rises above a specified water level, the flush water can be made to overflow reliably from at least one overflow path. Furthermore, for example, if a functional part including electronic components, such as a warm water washing toilet seat device equipped with a private part cleaning device that cleans the user's private parts, is placed on the upper surface of the rim part of the toilet body, even if water leaks from a connection part such as the inlet or outlet of at least one overflow flow path due to aging, the at least one overflow flow path is positioned below the upper surface of the rim part of the toilet body, so the risk of an electric leak caused by the electronic components becoming wet can be reduced. Furthermore, because the flush water supplying device is equipped with multiple overflow paths, even if the flush water rises above a specified water level in the water storage tank, the flush water can be made to reliably overflow from the multiple overflow paths before this rising flush water reaches the water supply unit of the flush water supplying device. This reduces the risk of the water supply unit of the flush water supplying device becoming submerged in the event of a power outage or malfunction, etc. Furthermore, at least one of the multiple overflow flow paths is positioned below the top surface of the rim portion of the toilet body, making it possible to achieve a low silhouette for the entire flush toilet. As a result, a low silhouette can be achieved for the entire flush toilet, while preventing water leakage outside the machine and reliably reducing the risk of the water supply section of the flush water supply device becoming submerged due to overflowing flush water.

[0008] In the present invention, preferably, at least one of the plurality of overflow channels has an outlet connected to a location other than the bowl portion of the toilet body. In the present invention configured in this manner, the outlet portion of at least one of the multiple overflow flow paths is connected to a location other than the bowl portion of the toilet body, so that even if waste becomes clogged inside the bowl portion of the toilet body, at least one of the multiple overflow flow paths can ensure that waste overflows to a location other than the bowl portion of the toilet body. Therefore, the risk of the water supply section of the flush water supply device becoming submerged in water during a power outage or malfunction can be reduced.

[0009] In the present invention, preferably, one of the plurality of overflow paths has an outlet connected to a location other than the flush water path used for flushing the toilet. In the present invention configured in this manner, by connecting the outlet of one of the multiple overflow flow paths to a location other than the flush water flow path used for toilet flushing, the effect that flush water overflowing from one overflow flow path has on the flush water in the flush water flow path used for toilet flushing can be reduced compared to when the outlet of the overflow flow path is connected to the flush water flow path used for toilet flushing, and toilet flushing performance can be ensured. Furthermore, the flow path cross-sectional area of ​​the overflow path can be set larger than when the outlet of the overflow path is connected to a flush water path used for flushing the toilet, thereby improving overflow performance. This makes it possible to set the water level required for flushing inside the bowl portion of the toilet body lower, thereby achieving a low silhouette for the entire flush toilet.

[0010] In the present invention, preferably, one of the plurality of overflow channels has an outlet connected to a drain channel downstream of the drain trap pipe of the toilet body. In the present invention configured in this manner, the outlet of one of the multiple overflow flow paths is connected to a drainage flow path downstream of the drain trap pipe of the toilet body, so that even if a blockage of waste or the like occurs in the drain trap pipe of the toilet body, the overflow flow path can reliably cause flushing water to overflow into the drainage flow path. Therefore, the risk of the water supply section of the flush water supply device becoming submerged in water during a power outage or malfunction can be reduced.

[0011] In the present invention, preferably, all of the plurality of overflow channels are located below an upper surface of the rim portion. In the present invention configured in this manner, for example, if a functional part including electronic components, such as a warm water washing toilet seat device equipped with a private part cleaning device that cleans the user's private parts, is positioned above the upper surface of the rim part of the toilet body, even if water leaks from a connection part such as the inlet or outlet of one of the multiple overflow flow paths due to aging, all of the multiple overflow flow paths are positioned below the upper surface of the rim part of the toilet body, the risk of an electric leak caused by the electronic components becoming wet can be reduced. Furthermore, a low silhouette can be achieved for the entire flush toilet. Effect of the Invention

[0012] The flush toilet of the present invention can achieve a low silhouette, while suppressing water leakage to the outside of the machine and reliably reducing the risk of the water supply section becoming submerged by overflowing flush water. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a plan view of a flush toilet according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 1 is a schematic diagram showing the overall configuration of a flush toilet according to an embodiment of the present invention. [Figure 4] FIG. 1 is a diagram showing the overall configuration of a flush toilet according to one embodiment of the present invention, and a process for supplying and draining flush water. [Diagram 5] 2 is a cross-sectional view taken along line VV in FIG. 1. [Figure 6] FIG. 1 is a perspective view of a flush water supply device for a flush toilet according to one embodiment of the present invention, seen diagonally from behind. [Figure 7] FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] A flush toilet according to one embodiment of the present invention will now be described with reference to the accompanying drawings. Figure 1 is a plan view of a flush toilet according to one embodiment of the present invention, and Figure 2 is a cross-sectional view taken along line II-II in Figure 1. Furthermore, Figure 3 is a schematic diagram showing the overall structure of a flush toilet according to this embodiment. First, as shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention has a toilet body 2 placed in contact with a floor surface F, which is what is known as a "floor-mounted flush toilet." Furthermore, as shown in Figures 1 and 2, the floor-standing flush toilet 1 of this embodiment comprises a ceramic toilet body 2 that is placed in contact with the floor surface F, and a flush water supply device 4 that supplies flush water to this toilet body 2.

[0015] Next, as shown in Figures 1 to 3, the toilet body 2 specifically comprises a bowl portion 10 including a waste receiving surface 6 for receiving waste and a rim portion 8 formed on the upper edge of this waste receiving surface 6. The toilet body 2 also includes a drain trap pipe 12 that forms a drain passage for discharging waste from within the bowl portion 10. Here, above the rear upper surface 8a of the rim portion 8 of the toilet body 2, there is provided a functional portion D including electronic components of a warm water washing toilet seat device equipped with a private parts washing device for washing the private parts of the user.

[0016] Furthermore, as shown in Figures 2 and 3, more specifically, the drain trap pipe 12 forms a curved pipe line that, from the upstream side to the downstream side, its inlet portion 12a is connected to the lower portion of the bowl portion 10, extends from this inlet portion 12a to the rear and downward lowest end portion 12b, then rises to a rear and upper top portion 12c, and descends rear and downward from this top portion 12c. As shown in Figs. 2 and 3, a water seal (water seal surface WL0) is formed in the drain trap pipe 12 in a region upstream (forward) of the top 12c. Furthermore, in the flush toilet 1 of this embodiment, the outlet portion 12d on the downstream (rear) side of the curved pipe of the drain trap pipe 12 is connected via a drain socket 14 to a drain pipe 16 on the back side of the wall W (or the front wall W of the cabinet C), resulting in a so-called "wall drainage" drainage configuration.

[0017] 2 and 3, the toilet body 2 is equipped with a rim spouting section 18 including a rim spouting outlet 18a provided in the rim section 8. The rim spouting outlet 18a is directed toward the inside of the bowl section 10. As a result, flush water supplied from the flush water supply device 4 to the toilet body 2 is spouted W1 (rim spouting W1) from the rim spouting port 18a of the rim spouting section 18 towards the inside of the bowl section 10. That is, in this embodiment, toilet flushing is performed only by the rim water spout W1 spouted only from the rim water spouting port 18a, that is, toilet flushing by "100% rim water spouting flush" is performed.

[0018] Next, the flush water supply device 4 in the flush toilet 1 of the present embodiment will be explained in detail with reference to Figs. Fig. 4 is a diagram showing the overall configuration of a flush toilet according to this embodiment, and the flush water supply and drainage process thereof. Also, Fig. 5 is a cross-sectional view taken along line VV in Fig. 1. Furthermore, Fig. 6 is a perspective view of the flush water supply device for a flush toilet according to this embodiment, seen diagonally from behind, and Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 6. First, as shown in Figures 1 to 3, the flush water supply device 4 includes, from an external water source 22, such as a water main, toward the downstream side, a stopcock 24, a valve unit 26, a water supply section 28, a water storage tank 30, a pump 32, a rim-side supply pipe 36, and an overflow pipe 40. First, although a detailed description of the valve unit 26 will be omitted, the valve unit 26 is equipped with a constant flow valve (not shown), a diaphragm valve (not shown) which is an opening / closing valve provided downstream of the constant flow valve (not shown), and a solenoid valve (not shown) which opens and closes this opening / closing valve (diaphragm valve), etc. For example, cleaning water W0 (supply water W0) supplied from water supply source 22 through stop valve 24 at the water supply pressure of a water supply or the like passes through a constant flow valve (not shown) of valve unit 26 to adjust the flow rate to a constant level when a diaphragm valve (not shown) is opened by the operation of an electromagnetic valve (not shown) of valve unit 26, and then passes through the diaphragm valve (not shown). As a result, flush water W0 that has passed through valve unit 26 is supplied from water supply section 28 into a water storage tank 30 that is positioned behind and below bowl section 10 of the toilet body 2.

[0019] Incidentally, the flush water supply device 4 is equipped with a controller (not shown) that controls the operation of the pump 32 located behind and below the bowl portion 10 of the toilet body 2, and a float switch 42 that detects the water level in the water storage tank 30. Furthermore, the opening and closing operation of the solenoid valve (not shown) of the valve unit 26 is controlled by a controller (not shown) based on the water level in the water storage tank 30 detected by a float switch 42. Furthermore, the operation of the pump 32 is also controlled by a controller (not shown) based on the water level in the water storage tank 30 detected by a float switch 42. For example, when the water level in the water tank 30 detected by the float switch 42 is below a predetermined level, the solenoid valve (not shown) of the valve unit 26 opens and the diaphragm valve (not shown) of the valve unit 26 opens, thereby supplying water W0 from the water supply section 28 to the water tank 30.

[0020] Next, as shown in Figures 3, 5 and 6, the flush water supplying device 4 is provided with a toilet body side connecting pipe 44 which forms a pipe 44a (toilet body side connecting pipe 44a) extending downstream from the first outlet 30a which is below the specified water level (upper limit water level, full water level, first overflow water level) WL1 of the water storage tank 30, via the pump 32. As a result, when the pump 32 operates under the control of a controller (not shown) based on the water level in the water tank 30 detected by the float switch 42, the flushing water in the water tank 30 flows out from the first outlet 30a to the toilet body side connecting pipe 44a, is sucked up by the pump 32 and supplied to the rim water channel 36a from the rim side supply pipe 36. As a result, flush water in the water storage tank 30 passes through the pump 32 and is discharged as rim spout W1 from the rim spout port 18a of the toilet body 2. Then, as shown in Figure 3, when the water level in the water storage tank 30 rises to a predetermined water level (stopping water level) WL2 which is lower than the specified water level WL1, the solenoid valve (not shown) of the valve unit 26 closes based on the detection of the float switch 42, and the diaphragm valve (not shown) also closes, thereby stopping the water supply from the water supply section 28 and stopping the pump 32.

[0021] Next, as shown in Figures 3, 5 and 6, the water tank 30 is provided with an overflow side connecting pipe 46 that extends from its interior to the second outlet 30b above the specified water level WL1 of the water tank 30 and is connected to the overflow pipe 40. The overflow side connecting pipe 46 forms a pipe line 46a (overflow side connecting pipe line 46a) that connects the inside of the water storage tank 30 with the flow path 40a of the overflow pipe 40 (overflow flow path 40a). Also, as shown in Figures 2, 3, 5 and 7, the drain trap pipe 12 of the toilet body 2 is provided with a connecting member 12e that connects the downstream side of the drain trap pipe 12 and the upstream side of the drain socket 14, and this connecting member 12e forms a descending pipe 12f that descends from the top 12c of the drain trap pipe 12 to the downstream side (rear and downward). Furthermore, as shown in Figures 2, 3, 5 and 7, the overflow pipe 40 of the cleaning water supplying device 4 connects the outlet (second outlet 30b) of the overflow side connecting pipe 46 to the upper surface of the descending pipe 12f of the drain trap pipe 12. As a result, the first overflow flow path 40a is positioned below the upper surface 8a of the rim portion 8 of the toilet body 2, and flushing water W2 (first overflow flushing water W2) that exceeds the specified water level WL1 in the water storage tank 30 is caused to overflow via the overflow pipe 40 into the descending pipe 12f of the drain trap pipe 12.

[0022] Also, as shown in Figures 2, 3, 5 and 7, the outlet of the overflow side connecting pipe 46a corresponds to the second outlet 30b and is essentially the first overflow port 30b, and a flapper valve 48 is provided in this first overflow port 30b so as to be capable of being opened and closed. During normal use, when the toilet is not being flushed, the flapper valve 48 constantly closes the first overflow port 30b. Also, when flushing the toilet, the flapper valve 48 closes the first overflow port 30b to prevent backflow of water in the drain trap pipe 12 and suppress a decrease in flushing ability. In addition, even if a drain blockage occurs in the drain trap pipe 12, the flapper valve 48 closes to prevent backflow of drainage from the descending pipe 12f side of the drain trap pipe 12 through the overflow flow path 40a toward the overflow side connecting pipe 46a. It is also possible to prevent the intrusion of pests from the overflow flow path 40a into the overflow side connecting pipe 46a. Furthermore, in the event of an abnormality such as a malfunction of the flush water supply device 4 or stoppage due to a power outage, when the water level in the water tank 30 rises above the specified water level (upper limit water level, full water level, first overflow water level) WL1, the fluid force of the flush water causes the flapper valve 48 to open the first overflow port 30b. This allows the flush water W2 flowing out from the first overflow port 30b to flow (overflow) into the descending pipe 12f of the drain trap pipe 12 in the toilet body 2 without backflowing from the overflow flow path 40a.

[0023] Next, as shown in Figures 3, 5 and 6, the water supply section 28 of the cleaning water supply device 4 comprises a water supply pipe 28a connected to the valve unit 26 upstream of it, a water supply nozzle 28b connected to this water supply pipe 28a, a water supply port 28c provided at the downstream end of this water supply nozzle 28b, and a water receiving housing 28d that receives the cleaning water supplied from this water supply port 28c. This water receiving housing 28d is communicatively connected to the upper part of the water storage tank 30, and the flushing water W0 supplied into the water receiving housing 28d from the water supply port 28c is first received in the water receiving housing 28d, and then flows into the water storage tank 30 through the communication passage 28e between the water receiving housing 28d and the water storage tank 30. Additionally, an opening 28f (second overflow port 28f) is provided in a portion of the side wall of the water receiving housing 28d, the opening 28f being located above the first overflow port 30b of the water storage tank 30. This opening 28f (second overflow port 28f) is disposed below the upper surface 8a of the rim portion 8 of the toilet body 2. Furthermore, the lower end 28g of the opening 28f (second overflow port 28f) of the water receiving housing 28d is located lower than the water supply port 28c. This allows flush water W3 (second overflow flush water W3) to leak outside the machine from the second overflow port 28f in the unlikely event of a power outage or failure of the pump 32, causing flush water in the water storage tank 30 to rise into the water receiving housing 28d and reach the lower end 28g (second overflow water level WL3) of the opening 28f (second overflow port 28f). That is, the outside of the second overflow port 28f of the water receiving housing 28d is configured to serve as a second overflow flow path 28h for allowing the flush water W3 to leak outside the apparatus. Therefore, the user can become aware of an emergency situation due to water leakage W3 to the outside of the apparatus from the second overflow port 28f to the second overflow path 28h. Furthermore, when the flush water supply device 4 of the flush toilet 1 of this embodiment is to comply with overseas specifications such as those of Europe, the opening 28f (second overflow port 28f) of the water receiving housing 28d can provide an opening that is connected to the atmosphere above the first overflow port 30b of the water storage tank 30 and below the water supply port 28c, and it is possible to provide a space (air gap) between this water supply port 28c and the lower end 28g of the opening 28f (second overflow port 28f) without submerging the water supply port 28c of the water supply section 28. In this embodiment, the second overflow port 28f is described as being located at a height position below the upper surface 8a of the rim portion 8 of the toilet body 2, but as long as at least the height positions of the first overflow path 40a and the first overflow port 30b are located below the upper surface 8a of the rim portion 8 of the toilet body 2 on which the functional portion D is arranged, the height position of the second overflow port 28f may be located above the upper surface 8a of the rim portion 8 of the toilet body 2.

[0024] Next, the drain socket 14 will be described in detail with reference to Figs. As shown in Figures 2 to 7, the drain socket 14 has a main body portion 14a connected to the outlet portion 12d of the drain trap pipe line 12 of the toilet body 2, and this main body portion 14a connects the outlet portion 12d of the descending pipe line 12f of the drain trap pipe line 12 to the inlet portion 16a of the drain pipe 16 behind it. Furthermore, the main body 14a has a flow path (internal flow path) 14b formed therein, and the upstream end of this internal flow path 14b is an inlet 14c connected to the outlet 12d of the downflow pipe 12f of the drain trap pipe 12. The drain socket 14 also includes a water reservoir opening / closing valve 50 that is openably and closably provided for the inlet 14c of the internal flow path 14b in the main body 14a and the outlet 12d of the descending pipe 12f of the drain trap pipe 12. As a result, the drain socket 14 forms a drain flow path 14b downstream of the water reservoir opening / closing valve 50 and is attached to a part of the toilet body 2. Furthermore, the water reservoir opening / closing valve 50 includes a rotating shaft 50a, a valve body 50b that is integrally provided on the rotating shaft 50a, and a mechanism 50c that allows the rotating shaft 50a to rotate. An operating unit 52 that allows the user to manually open and close the valve in an emergency such as a power outage is connected to the mechanism 50c. Here, in Figure 7, the water storage opening / closing valve 50 is shown by a solid line when the outlet 12d of the drain trap pipe 12 is closed, and by a dotted line when it is open, but under normal circumstances, the valve body 50b rotates in the rotation direction R1 around the rotation axis 50a, keeping the outlet 12d of the drain trap pipe 12 always open. On the other hand, as shown in Figure 7, in the event of an emergency such as a power outage, the user can manually close the water storage valve 50 by operating the operating part 52, thereby allowing water to be stored in the flow path within the drain trap pipe 12 of the toilet body 2 upstream of the water storage valve 50 and in the storage part within the bowl section 10.

[0025] Next, as shown in FIGS. 2, 3, and 5 to 7, the water reservoir on-off valve 50 is provided on the downstream side of the water sealing surface WL0 of the drain trap pipe 12. In addition, an air vent pipe 54 is connected between the water sealing surface WL0 in the drain trap pipe line 12 and the water reservoir opening / closing valve 50, which can vent the air in the area A1 to the outside. The air vent pipe 54 has its inlet 54a connected between the sealing surface WL0 in the drain trap pipeline 12 and the water reservoir opening / closing valve 50, and its outlet 54b connected to the drain flow path 14b downstream of the water reservoir opening / closing valve 50 in the drain socket 14. The outlet 54b of the air vent pipe 54 may be connected to a drainage flow path such as the drain pipe 16 that is connected downstream of the drain socket 14. Furthermore, as shown in FIG. 7, the outlet 54b of the air vent pipe 54 is positioned adjacent to the water reservoir valve in the closed state so that it is closed by cleaning water passing through the water reservoir valve in the open state.

[0026] Next, as shown in FIG. 7, the inlet 54a of the air vent pipe 54 is connected to the overflow flow path 40a by being positioned above the outlet 40b of the overflow pipe 40 (overflow flow path 40a) which communicates with the descending pipe 12f of the lower drain trap pipe 12. The air vent pipe 54 curves upward from its inlet 54a toward its top portion 54c, then curves downward from the top portion 54c, and extends linearly to its outlet 54b below. Furthermore, the inlet 54 a and the top 54 c of the air vent pipe 54 are positioned higher than the top 12 g of the drain trap pipe 12 . As shown in Figures 3 and 7, the air vent pipe 54 is provided with a check valve 56. The check valve 56 allows air A0 to pass from the inlet 54a side of the air vent pipe 54 toward the outlet 54b side, while blocking the flow of air A0 from the outlet 54b side of the air vent pipe 54 toward the inlet 54a side.

[0027] Next, the operation of the flush toilet 1 according to the embodiment of the present invention described above will be explained with reference to Figs. 1 to 7. First, the flush toilet 1 according to one embodiment of the present invention is provided with multiple overflow flow paths 40a, 28h that allow flush water W2, W3 that exceeds a specified water level (upper limit water level, full water level, first overflow water level) WL1 in the water storage tank 30 of the flush water supply device 4 to overflow to different locations, and of these multiple overflow flow paths 40a, 28h, the first overflow flow path 40a can be positioned below the upper surface 8a of the rim portion 8 of the toilet body 2. On the other hand, the inlet (second overflow port 28f) of the second overflow channel 28h of the multiple overflow channels 40a, 28h can be positioned higher than the first overflow channel 40a. As a result, even if the flush water level in the water storage tank 30 of the flush water supply device 4 located behind or below the toilet body 2 rises above the specified water level WL1, the flush water W2 can be reliably overflowed from at least the first overflow path 40a. Furthermore, in the flush toilet 1 of this embodiment, the functional part D, which includes the electronic components of the warm water cleaning toilet seat device, which includes a private part cleaning device that cleans the user's private parts, is positioned above the rear upper surface 8a of the rim part 8 of the toilet body 2, and the first overflow flow path 40a itself is positioned below the upper surface 8a of the rim part 8 of the toilet body 2. Therefore, even if water leaks from connections such as the inlet 30b and outlet 40b of the first overflow flow path 40a due to aging, the risk of an electric leak caused by water getting into the electronic components of the functional part D can be reduced. Furthermore, because the inlet (second overflow port 28f) of second overflow flow path 28h is positioned higher than first overflow flow path 40a, even if flush water W2 that has exceeded the specified water level (upper limit water level, full water level, first overflow water level) WL1 in the water storage tank 30 further rises above first overflow flow path 40a and first overflow port 30b, flush water W3 can be made to reliably overflow (leak outside the machine) from second overflow port 28f and second overflow flow path 28h before this rising flush water reaches water supply port 28c of water supply section 28 of flush water supply device 4. This reduces the risk of water supply port 28c of water supply section 28 of flush water supply device 4 becoming submerged during a power outage, malfunction, etc. Furthermore, because both of the multiple overflow channels 40a, 28h are positioned below the upper surface 8a of the rim portion 8 of the toilet body 2, a low silhouette can be achieved for the entire flush toilet 1. As a result, a low silhouette is achieved for the entire flush toilet 1, while the first overflow path 40a and first overflow port 30b suppress water leakage outside the machine, and the risk of the water supply port 28c of the water supply section 28 of the flush water supply device 4 becoming submerged in overflow flush water is reliably reduced.

[0028] Furthermore, according to the flush toilet 1 of this embodiment, the outlet 40b of the first overflow path 40a and the second overflow port 28f of the second overflow path 28h are connected to a location other than the bowl portion 10 of the toilet body 2, so that even if a blockage of waste occurs in the bowl portion 10 of the toilet body 2, it is possible to ensure that the waste overflows to a location other than the bowl portion 10 of the toilet body 2 by at least one of the first overflow path 40a and the second overflow path 28h. Therefore, the risk of the water supply port 28c of the water supply section 28 of the flush water supply device 4 becoming submerged in water during a power outage or malfunction can be reduced.

[0029] Furthermore, with the flush toilet 1 of this embodiment, the outlet 40b of the first overflow flow path 40a is connected to a location other than the flush water flow path used for toilet flushing (the descending line 12f of the drain trap line 12), so the effect that the flush water W2 overflowing from the first overflow flow path 40a has on the flush water in the flush water flow path used for toilet flushing can be reduced compared to when the outlet 40b of the first overflow flow path 40a is connected to the flush water flow path used for toilet flushing, and therefore toilet flushing performance can be ensured. Furthermore, compared to when the outlet 40b of the first overflow flow path 40a is connected to a flushing water flow path used for toilet flushing (for example, the rim water conduit 36a or the rim water outlet section 18), the flow path cross-sectional area of ​​the first overflow flow path 40a can be set larger, thereby improving overflow performance. This allows the water level required for flushing inside the bowl portion 10 of the toilet body 2 to be set lower, making it possible to achieve a low silhouette for the entire flush toilet 1.

[0030] Furthermore, according to the flush toilet 1 of this embodiment, the outlet 40b of the first overflow flow path 40a is connected to a drainage flow path (downward pipe 12f) downstream of the drain trap pipe 12 of the toilet body 2, so that even if a blockage due to sewage or the like occurs upstream of the downward pipe 12f within the drain trap pipe 12 of the toilet body 2, the first overflow flow path 40a can reliably cause the flush water W2 to overflow from the downward pipe 12f of the drain trap pipe 12 to the drain pipe 16. Therefore, the risk of the water supply port 28c of the water supply section 28 of the flush water supply device 4 becoming submerged in water during a power outage or malfunction can be reduced.

[0031] Furthermore, according to the flush toilet 1 of this embodiment, the functional part D, which includes electronic components such as a warm water washing toilet seat device equipped with a private part cleaning device that cleans the user's private parts, is positioned above the upper surface 8a of the rim part 8 of the toilet body 2, and all of the multiple overflow paths 40a, 28h are positioned below the upper surface 8a of the rim part 8 of the toilet body 2. Therefore, even if water leaks from the connection parts such as the inlet 30b, 28f or outlet 40b of any of the multiple overflow paths 40a, 28h due to aging, the risk of an electric leak in the electronic components of the functional part D due to exposure to water can be reduced. Furthermore, a low silhouette can be achieved for the entire flush toilet 1.

[0032] In the flush toilet 1 according to the present embodiment described above, the outlet 40b of the first overflow flow path 40a is connected to the descending pipe 12f of the drain trap pipe 12, and the second overflow flow path 28h is arranged outside the second overflow port 28f of the water receiving housing 28d of the water supply section 28. However, the downstream connection destination of these overflow flow paths 40a, 28h may be connected to a location other than the bowl section 10 of the toilet body 2, or a location other than the flush water flow path used for toilet flushing. In other words, the downstream side of each overflow flow path 40a, 28h may be connected to the water storage section that forms the water sealing surface WL0 in the drain trap pipe 12, or to the drain flow path 14b in the drain socket 14, or may be connected to the drain pipe 16 downstream of the drain socket 14. Furthermore, in the flush toilet 1 according to the present embodiment described above, a "floor-mounted flush toilet" configuration is adopted in which the toilet body 2 is placed in contact with the floor surface F, and an example has been described in which the drainage configuration employs a so-called "wall drainage" configuration in which the outlet portion 12d of the drain trap pipe 12 is connected to the drain pipe 16 on the back side of the wall W (or the front wall W of the cabinet C) via the drain socket 14. However, when a "floor-mounted flush toilet" is adopted, the drainage form is not limited to "wall drainage", and a so-called "floor drainage" drainage form may also be adopted in which the outlet portion 12d of the drain trap pipe 12 is connected to a drain pipe located below the floor surface F via the drain socket 14. In addition, instead of adopting a "floor-mounted flush toilet" configuration, a so-called "wall-hung flush toilet" configuration may be adopted in which the rear of the toilet body 2 is fixed to the wall W of the toilet room T (or the front wall W of the cabinet C) and is positioned above and spaced apart from the floor surface F. Furthermore, in the flush toilet 1 of this embodiment described above, a form has been described in which so-called "toilet flushing with 100% rim water spouting" is performed using only rim water spouting from the rim water spouting outlet 18a, but as a modified example, it is also possible to apply a form in which so-called "toilet flushing with rim-jet flushing" is performed using a combination of rim water spout W1 from the rim water spouting outlet 18a of the toilet body 2 and jet water spouting from the jet water spouting outlet. Even in the case of such a modified example, it is preferable that all of the multiple overflow channels 40a, 28h are positioned below the upper surface 8a of the rim section 8 of the toilet body 2. Furthermore, as a variation of the flush toilet 1 of the embodiment described above, it is also possible to apply it to a so-called "hybrid flush toilet" in which flush water supplied under direct pressure from the water supply is supplied directly to the rim spout 18a of the toilet body 2, and flush water that is temporarily supplied and stored in the water storage tank 30 is supplied to the jet spout 20a of the toilet body 2 by the pump 32. [Explanation of symbols]

[0033] 1. Flush toilet according to one embodiment of the present invention 2 Toilet bowl body 4. Cleaning water supply device 6 Waste receiving surface 8 Rim 8a Top surface of rim 10 Bowl section 12 Drain trap line 12a Inlet of drain trap pipe 12b Bottom end of drain trap pipe 12c Top of drain trap line 12d Outlet of drain trap pipe 12e Drain trap pipe connection parts 12f Drain trap pipe descending pipe 12g Top of drain trap pipe 14 Drain socket 14a Drain socket body 14b Drain socket internal flow passage, drain flow passage 14c Inlet of the internal flow passage of the drain socket 16 Drain pipe 16a Drain pipe inlet 18 Rim outlet 18a Rim Spout 22 Water supply source 24 Stopcock 26 Valve unit 28 Water supply section 28a Water supply pipe 28b Water supply nozzle 28c water inlet 28d Water receiving housing 28e Communication path 28f opening, second overflow opening 28g Bottom end of the second overflow port 28h Second overflow channel 30 Water Tank 30a 1st outlet 30b: second outlet, first overflow port, inlet of first overflow channel 32 Pump 36 Rim side supply pipe 36a Rim Waterway 40 Overflow pipe 40a Overflow channel 40b Outlet of overflow channel 42 Float switch 44 Toilet body side connection pipe 44a Toilet body side connection pipe 46 Overflow side connecting pipe 46a Overflow side connection pipe 48 Flapper valve 50 Water reservoir on-off valve 50a Rotating shaft 50b Valve body 50c Mechanism 52 Operation section 54 Air vent pipe 54a Air vent pipe inlet 54b Air vent outlet 54c Top of the air vent pipe 56 Check valve A0 Air in the area between the sealing surface and the water reservoir valve in the drain trap pipe A1 The area between the sealing surface and the water reservoir valve in the drain trap pipe C Cabinet D. Functional part of the warm water cleaning toilet seat device F Floor T Toilet room W Toilet room wall or cabinet front wall W0 Water supply W1 Rim water discharge, rim cleaning water W2 First overflow washing water W3 Second overflow washing water WL0 Sealing surface of the bowl of the toilet body and the drain trap pipe WL1: Standard water level in the water tank, upper limit water level, full water level, first overflow water level WL2 Stop water level in water tank WL3 Second overflow level

Claims

1. A flush toilet that is flushed with flush water to expel waste, a toilet body including a bowl portion for receiving waste, a rim portion formed on an upper edge of the bowl portion, and a drain trap pipe for discharging waste within the bowl portion; a flush water supply device for supplying flush water to the toilet body, The flush water supply device comprises a water supply section which supplies flush water supplied from a water supply source, a water storage tank which is provided behind or below the toilet body and which stores the flush water supplied from the water supply section, a pump which draws in the flush water in the water storage tank and flows it into the toilet body, and a number of overflow paths which cause flush water which exceeds a specified water level in the water storage tank to overflow to different locations, A flush toilet, wherein at least one of the multiple overflow flow paths is disposed below an upper surface of the rim portion.

2. 2. The flush toilet according to claim 1, wherein the outlet of at least one of the plurality of overflow channels is connected to a location other than the bowl portion of the toilet body.

3. 2. The flush toilet according to claim 1, wherein one of the plurality of overflow paths has an outlet connected to a location other than the flush water path used for flushing the toilet.

4. 2. The flush toilet according to claim 1, wherein an outlet of one of the plurality of overflow paths is connected to a drainage path in the toilet body that is downstream of the drain trap pipe.

5. 2. The flush toilet according to claim 1, wherein all of the multiple overflow channels are positioned below an upper surface of the rim portion.

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