FLUSH TOILET

Abstract

 An object is to provide a flush toilet capable of suppressing out-of-machine water leakage and reliably reducing a risk that a water supply part is submerged in overflown flush water, while achieving low silhouette. A flush toilet 1 of the present invention includes a toilet main body 2, and a flush water supply device 4 that supplies flush water to this toilet main body, wherein this flush water supply device includes a water supply part 28 that supplies flush water W0 supplied from a water supply source 22, a reservoir tank 30 provided behind or below the toilet main body to store the flush water supplied from the water supply part, a pump 32 that sucks flush water in the reservoir tank 30 and causes the flush water to flow to the toilet main body, and a plurality of overflow flow channels 40a, 28h for flush water W2, W3 exceeding a prescribed water level WL1 in the reservoir tank to overflow at different locations, and at least one flow channel of the plurality of overflow flow channels is disposed below an upper surface 8a of a rim 8 of the toilet main body 2.

Description

BACKGROUND OF THE INVENTION

Field of the Invention

[0001] The present invention relates to a flush toilet and more particularly to a flush toilet which is flushed with flush water to discharge waste.

Description of the Related Art

[0002] Conventionally, as a flush toilet which is flushed with flush water to discharge waste, for example, a flush toilet comprising a plurality of overflow flow channels is known as described in European Patent No. 3196370 and Japanese Patent No. 722241 (Japanese Patent Laid-Open No. 2020-51236).

[0003] First, a conventional flush toilet described in European Patent No. 3196370 is a so-called "wall mounted flush toilet" having a rear side of a toilet main body fixed to a wall surface and comprising the toilet main body and a flush water supply device supplying flush water to this toilet main body.

[0004] This flush water supply device includes a water supply part that supplies flush water supplied from a water supply source, a reservoir tank that stores the flush water supplied from this water supply part, and a pressurizing device that pressurizes flush water in the reservoir tank toward the toilet main body.

[0005] The reservoir tank includes a tank body and an auxiliary tank, and the auxiliary tank is provided to communicate above the tank body so that flush water is supplied from the water supply part. Furthermore, an overflow port is formed on a top edge of the auxiliary tank, while a communication port communicating with the tank body is formed in a bottom portion of the auxiliary tank, and in this communication port, a valve body (water stop ball) is openably/closably provided.

[0006] When the pressurizing device is inactive, the valve body opens the communication port of the auxiliary tank, such that flush water supplied from the water supply part to an interior of the auxiliary tank is supplied into the tank body from the communication port.

[0007] When the pressurizing device is activated, the flush water in the tank body is pressurized by the pressurizing device and supplied to an interior of the toilet main body from a supply pipe connecting the tank body to the toilet main body, and the valve body closes the communication port of the auxiliary tank to prevent the flush water in the auxiliary tank from rising to the overflow port and from overflowing.

[0008] Furthermore, in the conventional flush toilet described in European Patent No. 3196370, if flush water in the reservoir tank exceeds a prescribed water level due to power failure or failure in the pressurizing device, the flush water overflows through two overflow flow channels including a flow channel (first overflow flow channel) for the flush water in the tank body to overflow from the supply pipe to the toilet main body and a flow channel (second overflow flow channel) for the flush water in the tank body to overflow via the communication port of the auxiliary tank and the overflow port to an exterior of the toilet main body (so-called, "out-of-machine water leakage").

[0009] In the conventional flush toilet described in Japanese Patent No. 722241 (Japanese Patent Laid-Open No. 2020-51236), a tank device is provided for supplying flush water to the toilet main body, and the tank device includes a tank body that stores flush water, a coupling unit detachably attached to an opening above the tank body, and a water supply part that supplies water to the coupling unit. Furthermore, a first overflow port is formed in the coupling unit so that the flush water rising from the tank body to an interior of the coupling unit overflows outward, and this first overflow port is connected to a water spout pipe of the toilet main body via an overflow pipe. In addition, a second overflow port communicating between an internal space and an external space is formed above the first overflow port of the coupling unit.

[0010] Such flush toilets as described above can comply, for example, with flush toilets according to European standards, even if it is necessary to provide the second overflow port open to the outside, in addition to the first overflow port connected to the overflow pipe.

[0011] In the above-described conventional flush toilet described in European Patent No. 3196370 described above, if a toilet bowl flushing operation is performed while a water supply part continues to supply water due to, for example, failure in the water supply part of a flush water supply device, there is a problem that water may leak outward from a reservoir tank through an overflow port (second overflow flow channel) of an auxiliary tank (out-of-machine water leakage).

[0012] Moreover, in the conventional flush toilet described in European Patent No. 3196370 described above, in a first overflow flow channel for flush water in a tank body to overflow from a supply pipe to a toilet main body, there is a problem that such an overflow function cannot be performed, because the channel functions as a flush water flow channel essentially for use in flushing during toilet bowl flushing.

[0013] Next, in the conventional flush toilet described in Japanese Patent No. 722241 (Japanese Patent Laid-Open No. 2020-51236), both a first overflow port and a second overflow port are arranged above an upper surface of a rim of a toilet main body, and there is a problem that low silhouette may be hindered in the whole flush toilet.

[0014] Furthermore, in the conventional flush toilet in Japanese Patent No. 722241 (Japanese Patent Laid-Open No. 2020-51236) described above, if flush water in a tank body exceeds a prescribed water level to rise to an interior of a coupling unit and overflows through both the first overflow port and the second overflow port, there is a problem that a water supply part of a tank device may be submerged.

[0015] Additionally, in the conventional flush toilet described in Patent Literature 2, a functional part including an electronic component such as a warm water washing toilet seat device including a private part washing device that washes a private part of a user's body is disposed above an upper surface of a rim of a toilet main body. In this case, there is a risk of electricity leakage due to exposure of the electronic component to flush water leakage from a connecting part of a first overflow flow channel due to aging or the like, or flush water leakage out of this machine through the second overflow port.

[0016] Therefore, in recent years, it has been a requested issue how to suppress the out-of-machine water leakage and how to reduce a risk that the water supply part of the flush water supply device is submerged in overflown flush water, while achieving the low silhouette in the whole flush toilet.

[0017] An object of the present invention, which has been made to solve the above problems of conventional techniques and the recently requested issues, is to provide a flush toilet capable of suppressing out-of-machine water leakage and reliably reducing a risk that a water supply part is submerged in overflown flush water, while achieving low silhouette.

SUMMARY OF THE INVENTION

[0018] To solve the above problems, according to the present invention, a flush toilet which is flushed with flush water to discharge waste is provided, the flush toilet including: a toilet main body including a bowl that receives waste, a rim formed on a top edge of the bowl, and a discharge trap conduit for discharging waste inside the bowl, and a flush water supply device that supplies flush water to the toilet main body, the flush water supply device includes a water supply part that supplies flush water supplied from a water supply source, a reservoir tank provided behind or below the toilet main body to store the flush water supplied from the water supply part, a pump that sucks flush water in the reservoir tank and causes the flush water to flow to the toilet main body, and a plurality of overflow flow channels for flush water exceeding a prescribed water level in the reservoir tank to overflow at different locations, and at least one flow channel of the plurality of overflow flow channels is disposed below an upper surface of the rim.

[0019] According to the present invention, this configuration includes the plurality of overflow flow channels for flush water exceeding the prescribed water level in the reservoir tank of the flush water supply device to overflow at different locations, and at least one flow channel of the plurality of overflow flow channels can be disposed below the upper surface of the rim of the toilet main body.

[0020] Consequently, even if the water level of the flush water in the reservoir tank of the flush water supply device provided behind or below the toilet main body rises above the prescribed water level, the flush water can reliably overflow through at least one overflow flow channel.

[0021] In addition, for example, a functional part including an electronic component such as a warm water washing toilet seat device including a private part washing device that washes a private part of a user's body is disposed on the upper surface of the rim of the toilet main body. In this case, even if water leaks from a connecting part such as an inlet or outlet of at least one overflow flow channel due to aging, it is possible to reduce a risk of electricity leakage due to exposure of the electronic component to water, because the at least one overflow flow channel is disposed below the upper surface of the rim of the toilet main body.

[0022] Furthermore, the flush water supply device includes the plurality of overflow flow channels, and even if the flush water exceeding the prescribed water level in the reservoir tank rises, the raised flush water can reliably overflow through the plurality of overflow flow channels before the raised flush water reaches the water supply part of the flush water supply device. Therefore, it is possible to reduce a risk of the water supply part of the flush water supply device being submerged in water during power failure, at the time of failure or the like.

[0023] Furthermore, since at least one overflow flow channel of the plurality of overflow flow channels is disposed below the upper surface of the rim of the toilet main body, low silhouette can be achieved in the whole flush toilet.

[0024] As a result, while achieving the low silhouette in the whole flush toilet, it is possible to suppress the out-of-machine water leakage and to reliably reduce the risk of the water supply part of the flush water supply device being submerged in overflown flush water.

[0025] In the present invention, preferably, at least one flow channel of the plurality of overflow flow channels has an exit connected to a location other than the bowl of the toilet main body.

[0026] In the present invention including this configuration, the exit of at least one flow channel of the plurality of overflow flow channels is connected to the location other than the bowl of the toilet main body. Therefore, even if an interior of the bowl of the toilet main body is clogged with waste, flush water can reliably overflow at the location other than the bowl of the toilet main body through at least one flow channel of the plurality of overflow flow channels.

[0027] Therefore, it is possible to reduce the risk that the water supply part of the flush water supply device is submerged during the power failure, at the time of failure or the like.

[0028] In the present invention, preferably, one overflow flow channel of the plurality of overflow flow channels has an exit connected to a location other than a flush water flow channel for use in toilet bowl flushing.

[0029] In the present invention including this configuration, the exit of one overflow flow channel of the plurality of overflow flow channels is connected to the location other than the flush water flow channel for use in toilet bowl flushing. Therefore, as compared with a case where the exit of the overflow flow channel is connected to the flush water flow channel for use in the toilet bowl flushing, the flush water overflowing from one overflow flow channel can be inhibited from affecting the flush water of the flush water flow channel for use in the toilet bowl flushing, and hence a toilet bowl flushing performance can be ensured.

[0030] Furthermore, as compared with the case where the exit of the overflow flow channel is connected to the flush water flow channel for use in the toilet bowl flushing, a flow channel cross-sectional area of the overflow flow channel can be set to be larger, and an overflow performance can be improved.

[0031] Therefore, a water level required for cleaning an interior of the bowl of the toilet main body can be set low, and the low silhouette of the whole flush toilet can be achieved.

[0032] In the present invention, preferably, one flow channel of the plurality of overflow flow channels has an exit connected to a discharge flow channel downstream of the discharge trap conduit of the toilet main body.

[0033] In the present invention including this configuration, the exit of one flow channel of the plurality of overflow flow channels is connected to the discharge flow channel downstream of the discharge trap conduit of the toilet main body. Therefore, even if an interior of the discharge trap conduit of the toilet main body is clogged with waste or the like, the flush water can reliably overflow into the discharge flow channel through the overflow flow channel.

[0034] Therefore, it is possible to reduce the risk that the water supply part of the flush water supply device is submerged during the power failure, at the time of failure or the like.

[0035] In the present invention, preferably, all of the plurality of overflow flow channels are arranged below the upper surface of the rim.

[0036] In the present invention including this configuration, for example, the functional part including the electronic component such as the warm water washing toilet seat device including the private part washing device that washes the private part of the user's body is disposed above the upper surface of the rim of the toilet main body, and all of the plurality of overflow flow channels are arranged below the upper surface of the rim of the toilet main body. In this case, even if water leaks from the connecting part such as the inlet or outlet of at least one overflow flow channel of the plurality of overflow flow channels due to aging, it is possible to reduce the risk of the electric leakage due to the exposure of the electronic component to water.

[0037] In addition, the low silhouette can be achieved in the whole flush toilet.

[0038] According to the flush toilet of the present invention, while achieving low silhouette, it is possible to suppress out-of-machine water leakage and to reliably reduce the risk that the water supply part is submerged in overflown flush water.

BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 

FIG. 1 is a plan view of a flush toilet according to one embodiment of the present invention;

FIG. 2 is a cross-sectional view along the line II-II of FIG. 1;

FIG. 3 is a schematic view showing an overall configuration of the flush toilet according to one embodiment of the present invention;

FIG. 4 is a diagram schematically showing each configuration of the whole flush toilet according to one embodiment of the present invention and a flush water supply and discharge process;

FIG. 5 is a cross-sectional view along the line V-V of FIG. 1;

FIG. 6 is a perspective view of a flush water supply device of the flush toilet according to one embodiment of the present invention viewed diagonally from behind; and

FIG. 7 is a cross-sectional view along the line VII-VII of FIG. 6.

DETAILED DESCRIPTION OF THE INVENTION

[0040] Hereinafter, with reference to the accompanying drawings, a flush toilet according to one embodiment of the present invention will be described.

[0041] FIG. 1 is a plan view of the flush toilet according to one embodiment of the present invention. FIG. 2 is a cross-sectional view along the line II-II of FIG. 1. FIG. 3 is a schematic view showing an overall configuration of the flush toilet according to the present embodiment.

[0042] First, as shown in FIGS. 1 and 2, a flush toilet 1 according to one embodiment of the present invention is a so-called "floor-standing flush toilet" in which a toilet main body 2 is disposed in contact on a floor surface F.

[0043] Furthermore, as shown in FIGS. 1 and 2, the floor-standing flush toilet 1 of the present embodiment includes the toilet main body 2 made of ceramic and disposed in contact on the floor surface F and a flush water supply device 4 that supplies flush water to the toilet main body 2.

[0044] Next, as shown in FIGS. 1 to 3, the toilet main body 2 specifically includes a bowl 10 including a waste receiving surface 6 that receives waste and a rim 8 formed on a top edge of the waste receiving surface 6.

[0045] The toilet main body 2 includes a discharge trap conduit 12 that forms a discharge flow channel that discharges waste inside the bowl 10.

[0046] Above an upper surface 8a of a rear side of the rim 8 of the toilet main body 2, a functional part D including an electronic component of a warm water washing toilet seat device including a private part washing device that washes a private part of a user's body is provided.

[0047] Furthermore, as shown in FIGS. 2 and 3, more specifically, the discharge trap conduit 12 forms, from upstream toward downstream, a bent conduit having an inlet 12a connected to below the bowl 10, extending downward and rearward from the inlet 12a to a lowermost end portion 12b, then ascending upward and rearward to a top portion 12c, and descending downward and rearward from the top portion 12c.

[0048] As shown in FIGS. 2 and 3, sealed water (sealed water surface WL0) is formed in a region upstream (forward) of the top portion 12c in the discharge trap conduit 12.

[0049] In the flush toilet 1 of the present embodiment, an exit 12d downstream (rearward) of the bent conduit of the discharge trap conduit 12 is connected to a discharge pipe 16 on a back side of a wall W (or a front wall W of a cabinet C) via a discharge socket 14.

[0050] Next, as shown in FIGS. 2 and 3, the toilet main body 2 includes a rim spout part 18 including a rim spout port 18a provided in the rim 8. The rim spout port 18a is oriented toward an interior of the bowl 10.

[0051] As such, flush water supplied from the flush water supply device 4 to the toilet main body 2 (rim spout water W1) is spouted from the rim spout port 18a of the rim spout part 18 toward the interior of the bowl 10.

[0052] That is, in the present embodiment, a toilet bowl is flushed only with the rim spout water W1 spouted only from the rim spout port 18a. That is, the toilet bowl flushing is executed according to so-called "toilet bowl flushing with 100% rim spout water".

[0053] Next, with reference to FIGS. 1 to 7, the flush water supply device 4 in the flush toilet 1 of the present embodiment will be described in detail.

[0054] FIG. 4 is a diagram schematically showing each configuration of the whole flush toilet according to the present embodiment and a flush water supply and discharge process. FIG. 5 is a cross-sectional view along the line V-V of FIG. 1. FIG. 6 is a perspective view of the flush water supply device of the flush toilet according to the present embodiment viewed diagonally from behind, and FIG. 7 is a cross-sectional view along the line VII-VII of FIG. 6.

[0055] First, as shown in FIGS. 1 to 3, the flush water supply device 4 includes, from an external water supply source 22 such as water supply toward downstream, a stop cock 24, a valve unit 26, a water supply part 28, a reservoir tank 30, a pump 32, a rim side supply pipe 36, and an overflow pipe 40.

[0056] First, the valve unit 26, which is not specifically described, includes a fixed flow valve (not shown), a diaphragm valve (not shown) that is an on-off valve provided downstream of the fixed flow valve (not shown), and an electromagnetic valve (not shown) that opens and closes the on-off valve (diaphragm valve).

[0057] For example, when the diaphragm valve (not shown) is opened by operating the electromagnetic valve (not shown) of the valve unit 26, flush water W0 (supply water W0) supplied from the water supply source 22 via the stop cock 24 under supply water pressure of the water supply or the like passes through the fixed flow valve (not shown) of the valve unit 26, has its flow rate adjusted to be constant, and then passes through the diaphragm valve (not shown).

[0058] Thus, the flush water W0 passing through the valve unit 26 is supplied from the water supply part 28 into the reservoir tank 30 disposed behind and below the bowl 10 of the toilet main body 2.

[0059] Additionally, the flush water supply device 4 includes a controller (not shown) that controls the operation of the pump 32 disposed behind and below the bowl 10 of the toilet main body 2, and a float switch 42 that detects the water level in the reservoir tank 30.

[0060] Furthermore, the opening and closing operation of the electromagnetic valve (not shown) of the valve unit 26 is controlled by the controller (not shown) based on the water level in the reservoir tank 30 detected by the float switch 42.

[0061] The operation of the pump 32 is also controlled by the controller (not shown) based on the water level in the reservoir tank 30 detected by the float switch 42.

[0062] For example, if the water level in the reservoir tank 30 detected by the float switch 42 is predetermined or less, the electromagnetic valve (not shown) of the valve unit 26 is opened, and the diaphragm valve (not shown) of the valve unit 26 is also opened. The supply water W0 is then supplied from the water supply part 28 to the reservoir tank 30.

[0063] Next, as shown in FIGS. 3, 5 and 6, the flush water supply device 4 includes a toilet main body side connecting pipe 44 forming a conduit 44a (toilet main body side connecting conduit 44a) extending downstream through the pump 32 of the reservoir tank 30 from a first outflow port 30a below a prescribed water level (upper limit water level, full water level, first overflow water level) WL1.

[0064] Consequently, when the pump 32 is operated by the control of the controller (not shown) based on the water level in the reservoir tank 30 detected by the float switch 42, the flush water in the reservoir tank 30 flows out from the first outflow port 30a to the toilet main body side connecting conduit 44a, is sucked from the pump 32, and is supplied from the rim side supply pipe 36 to a rim conduit 36a.

[0065] Then, the rim spout water W1 of the flush water in the reservoir tank 30 is spouted from the rim spout port 18a of the toilet main body 2 through the pump 32.

[0066] Then, as shown in FIG. 3, when the water level in the reservoir tank 30 rises and reaches a predetermined water level (stopped water level) WL2 below the prescribed water level WL1, the electromagnetic valve (not shown) of the valve unit 26 is closed and the diaphragm valve (not shown) is closed based on detection of the float switch 42, such that the water supply of the water supply part 28 is stopped and the pump 32 is stopped.

[0067] Next, as shown in FIGS. 3, 5 and 6, the reservoir tank 30 includes an overflow side connecting pipe 46 extending from an interior of the reservoir tank to a second outflow port 30b above the prescribed water level WL1 of the reservoir tank 30 and being connected to the overflow pipe 40.

[0068] The overflow side connecting pipe 46 forms a conduit 46a (overflow side connecting conduit 46a) that communicates between the interior of the reservoir tank 30 and a flow channel 40a (overflow flow channel 40a) of the overflow pipe 40.

[0069] As shown in FIGS. 2, 3, 5 and 7, the discharge trap conduit 12 of the toilet main body 2 includes a connecting member 12e connecting a downstream side of the discharge trap conduit 12 to an upstream side of the discharge socket 14, and the connecting member 12e forms a descending conduit 12f descending from the top portion 12c of the discharge trap conduit 12 to the downstream side (downward and rearward).

[0070] Furthermore, as shown in FIGS. 2, 3, 5 and 7, the overflow pipe 40 of the flush water supply device 4 connects an outlet (second outflow port 30b) of the overflow side connecting pipe 46 to the upper surface of the descending conduit 12f of the discharge trap conduit 12.

[0071] As such, the first overflow flow channel 40a is disposed below the upper surface 8a of the rim 8 of the toilet main body 2, such that the flush water W2 (first overflow flush water W2) exceeding the prescribed water level WL1 in the reservoir tank 30 overflows into the descending conduit 12f of the discharge trap conduit 12 through the overflow pipe 40.

[0072] Furthermore, as shown in FIGS. 2, 3, 5 and 7, the outlet of the overflow side connecting conduit 46a corresponds to the second outflow port 30b and is substantially a first overflow port 30b, and in the first overflow port 30b, a flapper valve 48 is openably/closably provided.

[0073] The flapper valve 48 usually closes the first overflow port 30b, when the toilet bowl flushing is not performed during normal use.

[0074] Also, when the toilet bowl flushing is performed, the flapper valve 48 can close the first overflow port 30b to prevent backflow of water in the discharge trap conduit 12 and can inhibit drop in flushing capacity. In addition, for example, even if the discharge trap conduit 12 is clogged with water discharge, the flapper valve 48 is closed, such that discharge water is prevented from backflowing from a descending conduit 12f side of the discharge trap conduit 12 through the overflow flow channel 40a back into the overflow side connecting conduit 46a. It is also possible to prevent invasion of pests from an overflow flow channel 40a side into the overflow side connecting conduit 46a.

[0075] Furthermore, during abnormalities such as operation defects of the flush water supply device 4 and stop due to power failure, if the water level in the reservoir tank 30 rises above the prescribed water level (upper limit water level, full water level, first overflow water level) WL1, fluid force of flush water forces the flapper valve 48 to open the first overflow port 30b.

[0076] This can prevent the flush water W2 flowing out of the first overflow port 30b from backflowing from the overflow flow channel 40a, such that the flush water can flow out (overflow) into the descending conduit 12f of the discharge trap conduit 12 of the toilet main body 2.

[0077] Next, as shown in FIGS. 3, 5 and 6, the water supply part 28 of the flush water supply device 4 includes a water supply pipe 28a connected to the valve unit 26 upstream of the water supply part, a water supply nozzle 28b connected to the water supply pipe 28a, a water supply port 28c provided at a downstream end of the water supply nozzle 28b, and a water receiving housing 28d receiving flush water supplied from the water supply port 28c.

[0078] Since the water receiving housing 28d is communicatively coupled to an upper part of the reservoir tank 30, the flush water W0 supplied from the water supply port 28c into the water receiving housing 28d is once received in the water receiving housing 28d and then flows from a communication path 28e between the water receiving housing 28d and the reservoir tank 30 into the reservoir tank 30.

[0079] In a part of a side wall of the water receiving housing 28d, an opening 28f (second overflow port 28f) located above the first overflow port 30b of the reservoir tank 30 is provided. The opening 28f (second overflow port 28f) is disposed below the upper surface 8a of the rim 8 of the toilet main body 2.

[0080] The opening 28f (second overflow port 28f) of the water receiving housing 28d has a lower end 28g located below the water supply port 28c. If the flush water in the reservoir tank 30 should rise into the water receiving housing 28d due to power failure, failure in the pump 32 or the like and reach the lower end 28g (second overflow water level WL3) of the opening 28f (second overflow port 28f), the second overflow port 28f can allow out-of-machine water leakage of flush water W3 (second overflow flush water W3).

[0081] Specifically, the second overflow port 28f of the water receiving housing 28d has an outer side provided with a second overflow flow channel 28h for the out-of-machine water leakage of the flush waterW3.

[0082] Therefore, a user can notice an emergency situation by the out-of-machine leakage water W3 from the second overflow port 28f to the second overflow flow channel 28h.

[0083] For the flush water supply device 4 of the flush toilet 1 according to the present embodiment to comply with overseas specifications such as European standards, the opening 28f (second overflow port 28f) of the water receiving housing 28d can thus provide an opening for atmospheric communication above the first overflow port 30b of the reservoir tank 30 and below the water supply port 28c, such that a space (air gap) can be provided between the water supply port 28c and the lower end 28g of the opening 28f (second overflow port 28f) preventing the water supply port 28c of the water supply part 28 from being submerged.

[0084] Note that in the present embodiment, the second overflow port 28f will be described in a form in which its height position is placed lower than the upper surface 8a of the rim 8 of the toilet main body 2. However, the height position of the second overflow port 28f may be placed above the upper surface 8a of the rim 8 of the toilet main body 2, provided that height positions of at least the first overflow flow channel 40a and first overflow port 30b are placed below the upper surface 8a of the rim 8 of the toilet main body 2 where the functional part D is disposed.

[0085] Next, with reference to FIGS. 2 to 7, the discharge socket 14 will be described in detail.

[0086] As shown in FIGS. 2 to 7, the discharge socket 14 includes a body portion 14a connected to the exit 12d of the discharge trap conduit 12 of the toilet main body 2, and the body portion 14a connects the exit 12d of the descending conduit 12f of the discharge trap conduit 12 to an inlet 16a of the discharge pipe 16 at the rear of the body portion 14a.

[0087] The body portion 14a forms a flow channel (internal flow channel) 14b inside, and the internal flow channel 14b has an upstream end as an inlet 14c connected to the exit 12d of the descending conduit 12f of the discharge trap conduit 12.

[0088] The discharge socket 14 further includes a water reservoir on-off valve 50 openably/closably provided for the inlet 14c of the internal flow channel 14b in the body portion 14a and the exit 12d of the descending conduit 12f of the discharge trap conduit 12.

[0089] Consequently, the discharge socket 14 forms the discharge flow channel 14b downstream of the water reservoir on-off valve 50 and is attached to a part of the toilet main body 2.

[0090] The water reservoir on-off valve 50 includes a rotary shaft 50a, a valve body 50b provided integrally on the rotary shaft 50a, and a mechanism part 50c that enables the rotary shaft 50a to rotate. The mechanism part 50c is coupled to an operation part 52 that enables user's manual opening and closing operation in case of emergency such as during the power failure.

[0091] FIG. 7 shows the water reservoir on-off valve 50 in a state in which the exit 12d of the discharge trap conduit 12 is closed with a solid line, and in a state in which the exit is opened with a chain line. During normal times, the valve body 50b rotates about the rotary shaft 50a in a rotating direction R1, such that the exit 12d of the discharge trap conduit 12 is usually opened.

[0092] As shown in FIG. 7, for the water reservoir on-off valve 50 in case of emergency such as during the power failure, the user manually operates the operation part 52 to close the valve, such that water can be reserved in a flow channel in the discharge trap conduit 12 of the toilet main body 2 upstream of the water reservoir on-off valve 50 and a pooled water portion in the bowl 10.

[0093] Next, as shown in FIGS. 2, 3 and 5 to 7, the water reservoir on-off valve 50 is provided downstream of the sealed water surface WL0 of the discharge trap conduit 12.

[0094] Furthermore, an air vent tube 54 capable of removing air in a region A1 to the outside is connected between the sealed water surface WL0 in the discharge trap conduit 12 and the water reservoir on-off valve 50.

[0095] The air vent tube 54 has an inlet 54a connected between the sealed water surface WL0 in the discharge trap conduit 12 and the water reservoir on-off valve 50 and an outlet 54b connected to the discharge flow channel 14b downstream of the water reservoir on-off valve 50 of the discharge socket 14.

[0096] Note that the outlet 54b of the air vent tube 54 may be connected to a discharge flow channel such as the discharge pipe 16 connected to downstream of the discharge socket 14.

[0097] Furthermore, as shown in FIG. 7, the outlet 54b of the air vent tube 54 is disposed adjacent to the water reservoir on-off valve in a closed state so that the outlet is closed by flush water passing through an opened water reservoir on-off valve.

[0098] Next, as shown in FIG. 7, the inlet 54a of the air vent tube 54 is connected to the overflow flow channel 40a as the inlet is disposed above an outlet 40b of the overflow pipe 40 (overflow flow channel 40a) that communicates with the descending conduit 12f of the lower discharge trap conduit 12.

[0099] The air vent tube 54 rises curvedly from the inlet 54a toward an uppermost portion 54c, then descends curvedly from the uppermost portion 54c, and extends linearly downward to the outlet 54b.

[0100] For the air vent tube 54, the inlet 54a and the uppermost portion 54c are arranged at positions higher than an uppermost portion 12g of the discharge trap conduit 12.

[0101] As shown in FIGS. 3 and 7, the air vent tube 54 includes a check valve 56, and the check valve 56 allows passage of air A0 flow from an inlet 54a side of the air vent tube 54 toward an outlet 54b side, while blocking flow of air A0 from the outlet 54b side of the air vent tube 54 toward the inlet 54a side.

[0102] Next, with reference to FIGS. 1 to 7, an operation of the flush toilet 1 according to one embodiment of the present invention described above will be described.

[0103] First, the flush toilet 1 according to one embodiment of the present invention includes a plurality of overflow flow channels 40a and 28h for the flush water W2, W3 above the prescribed water level (upper limit water level, full water level, first overflow water level) WL1 in the reservoir tank 30 of the flush water supply device 4 to overflow at different locations, and the first overflow flow channel 40a of the plurality of overflow flow channels 40a and 28h can be disposed below the upper surface 8a of the rim 8 of toilet main body 2.

[0104] The second overflow flow channel 28h of the plurality of overflow flow channels 40a and 28h has an inlet (second overflow port 28f) disposed above the first overflow flow channel 40a.

[0105] Consequently, even if the water level of flush water in the reservoir tank 30 of the flush water supply device 4 provided behind or below the toilet main body 2 rises above the prescribed water level WL1, the flush water W2 can reliably overflow from at least the first overflow flow channel 40a.

[0106] Furthermore, in the flush toilet 1 of the present embodiment, the functional part D including an electronic component of a warm water washing toilet seat device including a private part washing device that washes a private part of a user's body is disposed above the upper surface 8a of the rear side of the rim 8 of the toilet main body 2, and the first overflow flow channel 40a itself is disposed below the upper surface 8a of the rim 8 of the toilet main body 2. In this case, even if water leaks from a connecting portion such as the inlet 30b or the outlet 40b of the first overflow flow channel 40a due to aging, it is possible to reduce a risk of electric leakage due to water exposure of the electronic component of the functional unit D or the like.

[0107] The inlet (second overflow port 28f) of the second overflow flow channel 28h is disposed above the first overflow flow channel 40a. In this case, even if the flush water W2 exceeding the prescribed water level (upper limit water level, full water level, first overflow water level) WL1 in the reservoir tank 30 further rises above the first overflow flow channel 40a and the first overflow port 30b, the flush water W3 can reliably overflow from the second overflow port 28f and the second overflow flow channel 28h (out-of-machine water leakage), before the raised flush water reaches the water supply port 28c of the water supply part 28 of the flush water supply device 4. Therefore, it is possible to reduce a risk that the water supply port 28c of the water supply part 28 of the flush water supply device 4 is submerged during power failure, at the time of failure or the like.

[0108] Since both of the overflow flow channels 40a and 28h are arranged below the upper surface 8a of the rim 8 of the toilet main body 2, low silhouette can be achieved in the whole flush toilet 1.

[0109] As a result, while achieving the low silhouette in the whole flush toilet 1, the first overflow flow channel 40a and the first overflow port 30b can suppress the out-of-machine water leakage, and it is possible to reliably reduce a risk that the water supply port 28c of the water supply part 28 of the flush water supply device 4 is submerged in overflown flush water.

[0110] According to the flush toilet 1 of the present embodiment, the outlet 40b of the first overflow flow channel 40a and the second overflow port 28f of the second overflow flow channel 28h are connected to a location other than the bowl 10 of the toilet main body 2. Therefore, even if the interior of the bowl 10 of toilet main body 2 is clogged with waste, water can reliably overflow at the location other than the bowl 10 of the toilet main body 2 through at least one of the first overflow flow channel 40a and the second overflow flow channel 28h.

[0111] Consequently, it is possible to reduce the risk that the water supply port 28c of the water supply part 28 of the flush water supply device 4 is submerged during the power failure, at the time of failure or the like.

[0112] According to the flush toilet 1 of the present embodiment, the outlet 40b of the first overflow flow channel 40a is connected to a location (the descending conduit 12f of the discharge trap conduit 12) other than the flush water flow channel for use in toilet bowl flushing. Therefore, as compared with a case where the outlet 40b of the first overflow flow channel 40a is connected to the flush water flow channel for use in the toilet bowl flushing, the flush water W2 overflowing from the first overflow flow channel 40a can be inhibited from affecting the flush water of the flush water flow channel for use in the toilet bowl flushing, and hence a toilet bowl flushing performance can be ensured.

[0113] Furthermore, as compared with the case where the outlet 40b of the first overflow flow channel 40a is connected to the flush water flow channel for use in the toilet bowl flushing (for example, the rim conduit 36a, the rim spout part 18 or the like), a flow channel cross-sectional area of the first overflow flow channel 40a can be set to be larger, and an overflow performance can be improved.

[0114] Therefore, a water level required for cleaning the interior of the bowl 10 of the toilet main body 2 can be set low, and the low silhouette of the whole flush toilet 1 can be achieved.

[0115] According to the flush toilet 1 of the present embodiment, the outlet 40b of the first overflow flow channel 40a is connected to a discharge flow channel (descending conduit 12f) downstream of the discharge trap conduit 12 of the toilet main body 2. Therefore, even if an interior of the discharge trap conduit 12 of the toilet main body 2 upstream of the descending conduit 12f is clogged with waste or the like, the flush water W2 can reliably overflow from the descending conduit 12f of the discharge trap conduit 12 to the discharge pipe 16 through the first overflow flow channel 40a.

[0116] Therefore, it is possible to reduce the risk that the water supply port 28c of the water supply part 28 of the flush water supply device 4 is submerged during the power failure, at the time of failure or the like.

[0117] According to the flush toilet 1 of the present embodiment, the functional part D including the electronic component such as the warm water washing toilet seat device including the private part washing device that washes the private part of the user's body is disposed above the upper surface 8a of the rim 8 of the toilet main body 2, and all of the plurality of overflow flow channels 40a and 28h are arranged below the upper surface 8a of the rim 8 of the toilet main body 2. In this case, even if water leaks from the connecting parts such as the inlets 30b, 28f, the outlet 40b and the like of any of the plurality of overflow flow channels 40a, 28h due to aging, it is possible to reduce the risk of the electric leakage due to the exposure of the electronic component of the functional part D to water.

[0118] In addition, the low silhouette can be achieved in the whole flush toilet 1.

[0119] In the flush toilet 1 according to the present embodiment described above, the outlet 40b of the first overflow flow channel 40a is connected to the descending conduit 12f of the discharge trap conduit 12, and the second overflow flow channel 28h is disposed outside the second overflow port 28f of the water receiving housing 28d of the water supply part 28. Although this form has been described, for connection destinations downstream of the overflow flow channels 40a and 28h, the flow channels may only be connected to the location other than bowl 10 of the toilet main body 2 or to the location other than the flush water flow channel for use in toilet bowl flushing. Specifically, a downstream side of each overflow flow channel 40a, 28h may be connected to the pooled water portion that forms the sealed water surface WL0 in the discharge trap conduit 12 or the discharge flow channel 14b in the discharge socket 14. Alternatively, the downstream side may be connected to the discharge pipe 16 or the like downstream of the discharge socket 14.

[0120] Furthermore, in the flush toilet 1 according to the present embodiment described above, a form of a "floor-standing flush toilet" in which the toilet main body 2 is disposed in contact on the floor surface F is adopted, and for a water discharge form, an example has been described in which the water discharge form by so-called "wall water discharge" including the exit 12d of the discharge trap conduit 12 connected to the discharge pipe 16 on the back side of the wall W (or the front wall W of the cabinet C) via the discharge socket 14 is adopted.

[0121] However, when "the floor-standing flush toilet" is adopted, the example is not limited to the water discharge form by the "wall water discharge", and a water discharge form by so-called "floor water discharge" may be adopted in which the exit 12d of the discharge trap conduit 12 is connected to a discharge pipe disposed below the floor surface F via the discharge socket 14.

[0122] Instead of adopting the form of the "floor-standing flush toilet", a form of a so-called "wall mounted flush toilet" may be adopted in which the toilet main body 2 has a rear part fixed to the wall W of a toilet room T (or the front wall W of the cabinet C) and the rear part is spaced above the floor surface F.

[0123] In the flush toilet 1 of the present embodiment described above, the form in which so-called "toilet bowl flushing with 100% rim spout water" is executed only by rim spout water only from the rim spout port 18a has been described. However, as a modification, a form is also applicable in which so-called "toilet bowl flushing by rim jet flushing " is executed by use of combination of the rim spout water W1 from the rim spout port 18a of the toilet main body 2 and jet spout water from a jet spout port. Even in this modification, it is preferable that all of the plurality of overflow flow channels 40a and 28h are arranged below the upper surface 8a of the rim 8 of the toilet main body 2.

[0124] Furthermore, as a modification of the flush toilet 1 of the present embodiment described above, the present embodiment is also applicable to a so-called "hybrid flush toilet" in which flush water supplied under direct pressure from water supply is directly supplied as it is to the rim spout port 18a of the toilet main body 2, and flush water once supplied and stored in the reservoir tank 30 is supplied to a jet spout port of the toilet main body 2 by the pump 32.

Reference Signs List

[0125] 

1 flush toilet according to one embodiment of the present invention

2 toilet main body

4 flush water supply device

6 waste receiving surface

8 rim

8a upper surface of rim

10 bowl

12 discharge trap conduit

12a inlet of discharge trap conduit

12b lowermost end portion of discharge trap conduit

12c top portion of discharge trap conduit

12d exit of discharge trap conduit

12e connecting member of discharge trap conduit

12f descending conduit of discharge trap conduit

12g uppermost portion of discharge trap conduit

14 discharge socket

14a body portion of discharge socket

14b internal flow channel of discharge socket, discharge flow channel

14c inlet of internal flow channel of discharge socket

16 discharge pipe

16a inlet of discharge pipe

18 rim spout part

18a rim spout port

22 water supply source

24 stop cock

26 valve unit

28 water supply part

28a water supply pipe

28b water supply nozzle

28c water supply port

28d water receiving housing

28e communication path

28f opening, second overflow port

28g lower end of second overflow port

28h second overflow flow channel

30 reservoir tank

30a first outflow port

30b second outflow port, first overflow port, inlet of first overflow flow channel 32 pump

36 rim side supply pipe

36a rim conduit

40 overflow pipe

40a overflow flow channel

40b outlet of overflow flow channel

42 float switch

44 toilet main body side connecting pipe

44a toilet main body side connecting conduit

46 overflow side connecting pipe

46a overflow side connecting conduit

48 flapper valve

50 water reservoir on-off valve

50a rotary shaft

50b valve body

50c mechanism part

52 operation part

54 air vent tube

54a inlet of air vent tube

54b outlet of air vent tube

54c uppermost portion of air vent tube

56 check valve

A0 air in region between sealed water surface and water reservoir on-off valve in discharge trap conduit

A1 region between sealed water surface and water reservoir on-off valve in discharge trap conduit

C cabinet

D functional part of warm water washing toilet seat device

F floor surface

T toilet room

W wall of toilet room or front wall of cabinet

W0 supply water

W1 rim spout water, rim flush water

W2 first overflow flush water

W3 second overflow flush water

WL0 sealed water surface of bowl of toilet main body and discharge trap conduit

WL1 prescribed water level in reservoir tank, upper limit water level, full water level, first overflow water level

WL2 stopped water level in reservoir tank

WL3 second overflow water level

Claims

1. A flush toilet which is flushed with flush water to discharge waste, comprising:

a toilet main body including a bowl that receives waste, a rim formed on a top edge of the bowl, and a discharge trap conduit configured to discharge waste inside the bowl, and

a flush water supply device that supplies flush water to the toilet main body, wherein the flush water supply device includes a water supply part that supplies flush water supplied from a water supply source, a reservoir tank provided behind or below the toilet main body to store the flush water supplied from the water supply part, a pump that sucks flush water in the reservoir tank and causes the flush water to flow to the toilet main body, and a plurality of overflow flow channels for flush water exceeding a prescribed water level in the reservoir tank to overflow at different locations, and

at least one flow channel of the plurality of overflow flow channels is disposed below an upper surface of the rim.

2. The flush toilet according to claim 1, wherein at least one flow channel of the plurality of overflow flow channels has an exit connected to a location other than the bowl of the toilet main body.

3. The flush toilet according to claim 1 or 2, wherein one overflow flow channel of the plurality of overflow flow channels has an exit connected to a location other than a flush water flow channel for use in toilet bowl flushing.

4. The flush toilet according to any one of claims 1 to 3, wherein one flow channel of the plurality of overflow flow channels has an exit connected to a discharge flow channel downstream of the discharge trap conduit of the toilet main body.

5. The flush toilet according to any one of claims 1 to 4, wherein all of the plurality of overflow flow channels are arranged below the upper surface of the rim.

Drawing