JP5757137B2 - Flush toilet - Google Patents

Description

  The present invention relates to a flush toilet that temporarily receives filth and discharges it together with wash water.

  As a flush toilet that temporarily receives filth and discharges it together with wash water, a toilet bowl described in Patent Document 1 has been proposed. As shown in FIG. 1 of the following Patent Document, the flush toilet described in Patent Document 1 below supplies a bowl portion having a waste receiving surface for temporarily receiving the waste material, and supplies cleaning water to the bowl portion. Cleaning water supply means such as a storage tank, an inlet connected to the lower part of the bowl, a rising pipe formed to extend upward from the inlet, and a lower pipe extending from the end of the rising pipe A drain trap pipe that stores water from an inlet portion to at least a part of the ascending pipe to form a stored water, and forms a sealed water by at least a part of the stored water. Road.

JP 2010-31551 A

  The conventional flush toilet described in Patent Document 1 can efficiently discharge filth by reducing the time required for washing water to be pushed into the drain trap pipe and the time required for siphon action as water is saved. It takes into account the importance. Specifically, attention is focused on how to form a flow of cleaning water other than the swirling flow that pushes floating filth into the stored water in the bowl portion and guides it to the drain trap side while suppressing the amount of water. Then, a new flush toilet has been proposed for the purpose of providing a flush toilet capable of reliably discharging floating filth without leaving it on the water surface of the bowl.

  As described above, in order to meet the demand for water saving, various devices have been devised for supplying the cleaning water to the bowl portion and handling the cleaning water in the bowl portion. However, from the lower end, which is the outlet of the bowl part, to the drain trap pipe, the reservoir is formed to form the sealed water. . In order to respond to the demand for stronger water saving, not only a device on the cleaning surface of the bowl part but also a device on the water saving surface in the drain trap pipe is required.

  Therefore, the present inventors temporarily retract the water stored in the drain trap pipe to form the sealed water from the drain trap pipe, and use the withdrawn water when cleaning the filth. Focused on that. However, in order to temporarily retract the drawn water from the drain trap pipe, some storage means for temporarily storing the drawn water is required. When drawing the drawn-in water from the drain trap pipe into the storage means, it is necessary to reliably draw the accumulated water before the filth enters. If cleaning water that flows the filth received by the bowl portion enters the temporary storage tank, there is a risk that the temporary storage tank may become clogged with filth or cause a strange odor.

  The present invention has been made in view of such problems, and its purpose is to temporarily use the stored water effectively while improving the water-saving performance by devising the handling of the stored water in the drain trap pipe. An object of the present invention is to provide a flush toilet that suppresses the mixing of storing water that is not stored water into the storing means for storing.

  In order to solve the above-mentioned problems, a flush toilet according to the present invention is a flush toilet that temporarily receives filth and discharges it together with wash water, and has a bowl portion having a filth receiving surface for temporarily receiving filth. Cleaning water supply means for supplying cleaning water to the bowl part, an inlet part connected to the lower part of the bowl part, an ascending pipe formed so as to extend upward from the inlet part, and the ascending pipe And when it is not in use, it stores water from the inlet to at least a part of the ascending pipe to form water, and at least one of the water is stored. A drain trap pipe that forms sealed water by the part, and a part of the stored water is drawn from the drain trap pipe as drawn water, and the drawn water is returned to the bowl part or the drain trap pipe. Includes a reservoir water use mechanism that, a.

The stored water use mechanism includes a temporary storage tank that temporarily stores the drawn water, a drawing means that draws a portion of the stored water from the drain trap pipe into the temporary storage tank as drawn water, and the temporary storage tank. And a return means for returning the water temporarily stored in the bowl portion or the drain trap pipe, and after the bowl portion receives the filth, the washing water supply means is placed in the bowl portion. washing water supply, the Oite the drain trap pipe as it flows drained, the flow rate of the washing water is drawn into the temporary storage tank is less than the flow rate of the washing water flowing into the drain trap pipe abnormal intrusion It has suppression means.

  The flush toilet according to the present invention includes a drain trap pipe, the drain trap pipe being connected to the lower part of the bowl part, and the rising pipe formed to extend upward from the inlet part. And a descending conduit formed to extend downward from the end of the ascending conduit. And when not in use, water is stored from the inlet portion to at least a part of the ascending pipeline to form a stored water, and the sealed water is formed by at least a part of the stored water. The sealed water formed in the drain trap pipe plays a role in preventing odor from the sewer pipe from entering the toilet room and preventing pests from entering the toilet room. In order to fulfill that role with certainty, the sealing depth of the sealing water formed in the drain trap pipe is set so that the sealing water does not run out due to evaporation of the stored water forming the sealing water.

  On the other hand, when paying attention to the use of the flush toilet, the filth received temporarily by the bowl part falls below the bowl part and is temporarily stored in the drain trap pipe inlet. In this state, cleaning water is supplied by the cleaning water supply means, and the filth flows through the drain trap pipe to the sewer pipe side. Therefore, a part of the stored water that forms the sealing water in the drain trap pipe is used for preventing the sealing water from being cut off when not in use. On the other hand, the filth received by the bowl during use is temporarily stored near the entrance of the drain trap pipe, and then washed away by the wash water. In the discharge of this filth, the reservoir water on the upstream side (bowl side) from the periphery of the filth and the cleaning water supplied by the cleaning water supply means contribute, so that the sewage in the drain trap pipe is located downstream from the filth periphery. Water does not necessarily contribute to the discharge of filth. If attention is paid to the characteristics of the drainage trap pipe of the flush toilet during use and non-use as described above, the reservoir water for forming the sealed water is stored in the same way during use and non-use. It is not always necessary, and there is room for devising how to store the battery when it is used and when it is not used.

  Therefore, in the present invention, there is provided a stored water utilization mechanism that draws a part of the stored water from the drain trap pipe as drawn water and returns the drawn water to the bowl portion or the drain trap pipe. By this stored water utilization mechanism, when the bowl portion temporarily receives the filth, and then drains it together with the cleaning water, the return means is driven after the drawing means is driven. Therefore, when not in use, the retained water is retained with a certain margin so as to form a sealed water with certainty. However, when flowing filth, the retracting means is driven first to draw in the unreserved water. And store it in a temporary storage tank. The return means returns the drawn water to the bowl portion or the drain trap pipe, so that the drawn water can contribute to the conveyance of the filth.

  Furthermore, in the present invention, after the bowl portion receives the filth, the washing water supplied to the bowl portion by the washing water supply means is prevented from being drawn into the temporary storage tank when flowing through the drain trap pipe. Intrusion suppression means is provided. In the present invention, the water to be used by the drawing-in means is a part of the stored water. If the washing water that flows filth is also drawn in, it becomes an abnormal intrusion that is not originally assumed. If such an abnormal intrusion of cleaning water is overlooked, there is a concern about the intrusion of filth and the reduction of water-saving performance. Therefore, by providing the abnormal intrusion suppression means as described above, it is possible to prevent normal washing water from entering the stored water utilization mechanism.

  Further, in the flush toilet according to the present invention, the abnormal intrusion suppression means increases the flow path resistance of the lead-in pipe line from the drain trap pipe line to the temporary storage tank higher than the flow path resistance of the drain trap pipe line. It is also preferable that this is configured.

  In this preferred embodiment, it is possible to suppress the abnormal intrusion of normal washing water into the lead-in pipe with a simple configuration in which the flow resistance of the lead-in pipe is higher than that of the drain trap pipe. .

  In the flush toilet according to the present invention, it is also preferable that the lower end of the flow path section at the topmost part of the drawing-in pipe line is formed at a position higher than the lower end of the cross section of the flow path at the topmost part of the ascending pipe line.

  In this preferred embodiment, the lower end of the cross section of the channel at the top of the inlet pipe is formed at a position higher than the lower end of the upper section of the channel of the rising pipe of the drain trap pipe. Even if normal washing water is drawn in, the washing water can be reliably prevented from flowing into the temporary storage tank.

  In the flush toilet according to the present invention, it is also preferable that the drawing-in pipeline has a bent portion formed by a first drawing-in portion and a second drawing-in portion with the topmost portion interposed therebetween.

  In this preferable aspect, by forming the bent portion at the topmost portion, the flow path resistance can be further increased, and the inflow of cleaning water to the temporary water storage tank can be reliably suppressed.

  Further, in the flush toilet according to the present invention, the topmost part is provided to be substantially the same height as a flush water supply port formed in the rim part of the bowl part, and the first drawing-in part is the topmost part. It is also preferable that the second drawing-in portion is formed as a portion connected while descending from the top to the temporary storage tank.

  In this preferred embodiment, the first lead-in portion is formed as a portion that is connected while descending toward the drain trap pipe, while the second lead-in portion is formed as a portion that is connected while descending toward the temporary storage tank. By making the angle of the part a steep angle, the channel resistance can be increased. Furthermore, since the position of a temporary storage tank can be lowered | hung by making the topmost part into the height equivalent to a rim | limb part, the arrangement | positioning freedom degree can be raised.

Further, in the flush toilet according to the present invention, the lead-in conduit is connected to the drain trap conduit from the side so as to penetrate the surface along which the drain trap conduit is bent, and the drain trap conduit and the drain trap conduit It is also preferable that the temporary storage tank is connected to the temporary storage tank and is inclined upward from a portion connected to the drain trap pipe .

  In the flush toilet according to the present invention, the drain trap pipe is formed from the upstream side to the downstream side while bending to form a sealed water. In the portion where the surface along the bending and the drain trap pipe intersects, the tendency of the water flowing through the drain trap pipe to go outside becomes strong. Therefore, in this preferred embodiment, when the drawing-in water is drawn from the stored water, the drawing-in pipe is connected to the inside of the draining trap pipe from the side so as to penetrate the surface along which the drain trapping pipe is bent. It is configured so that it is difficult to draw in filth.

  In the flush toilet according to the present invention, the lead-in pipe line is directed to the drain trap pipe so that the lead-in pipe line immediately after branching from the drain trap pipe is directed toward the upstream side of the drain trap pipe. It is also preferable that it is connected to the road.

  The filth flowing through the drain trap pipe flows from the upstream side, which is the bowl side of the drain trap pipe, toward the downstream side. Therefore, in this preferred embodiment, by connecting the intake pipe so as to face the upstream side with respect to the drain trap pipe, the direction in which the draw-in pipe draws in the drawn-in water can be made opposite to the direction in which the filth flows. In addition, it is possible to more reliably suppress the entry of filth.

  In the flush toilet according to the present invention, it is also preferable that the drawing-in means is constituted by a drawing-in pump that draws the drawing-in water from the stored water, and the drawing-in pump is provided in the middle of the drawing-in pipeline. .

  In this preferable aspect, by providing a drawing pump in the middle of the drawing line, the flow path resistance of the drawing line can be further increased, and the drawing of cleaning water can be more reliably suppressed.

In the flush toilet according to the present invention, the return means has a return line that is a line for returning the drawn-in water temporarily stored in the temporary storage tank to the bowl part or the drain trap line. and, the feedback conduit comprises a first feedback portion connected with downstream toward the temporary storage tank from the highest portion, the second feedback lead working down towards the highest portion in the bowl portion or the drain trap pipe The lower end of the flow path cross section at the top of the lead-in pipe is provided at a position higher than the lower end of the cross section of the flow path at the top of the rising pipe, while at the top of the return pipe It is also preferable that the lower end of the cross section of the flow path is higher than the lower end of the cross section of the flow path at the top of the rising pipe and is lower than the lower end of the cross section of the flow at the top of the drawing pipe.

  In this preferred embodiment, the lower end of the flow path cross section at the topmost part of the lead-in pipe line is arranged higher than the lower end of the cross section of the flow path at the topmost part of the return pipe line. it can.

  According to the present invention, cleaning water that is not stored water is mixed in the storage means for temporarily storing the stored water in order to effectively use the stored water while improving the water saving performance by devising the handling of the stored water in the drain trap pipe. Therefore, it is possible to provide a flush toilet that suppresses such a situation.

It is a perspective view showing typically the flush toilet concerning the embodiment of the present invention. It is sectional drawing which shows typically the flush toilet concerning embodiment of this invention. It is the figure which expanded the drawing pump vicinity shown in FIG. It is a figure for demonstrating the formation position of the communicating hole which a drain trap line and a drawing flow path connect. It is a figure for demonstrating the connection aspect of the drawing-in flow path with respect to a drain trap pipe line. It is a block block diagram which shows the control structure of the flush toilet concerning embodiment of this invention. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is typical sectional drawing for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG. It is a flowchart for demonstrating operation | movement of the flush toilet shown in FIG. 1 and FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same constituent elements in the drawings will be denoted by the same reference numerals as much as possible, and redundant description will be omitted.

  A flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic perspective view showing a flush toilet CSd according to an embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a flush toilet CSd according to an embodiment of the present invention. The flush toilet CSd shown in FIG. 2 mainly depicts the toilet body 10d, and the toilet seat, toilet lid, flush water supply valve, remote controller, and its operation panel are not shown.

  As shown in FIG. 1, the flush toilet CSd includes a toilet main body 10d and a sanitary washing device 70d. The sanitary cleaning device 70d is configured to be able to discharge cleaning water for cleaning the user's local portion from the cleaning nozzle 701d.

  As shown in FIG. 2, the toilet main body 10d constitutes a flush toilet that temporarily receives filth and discharges it together with wash water, and includes a bowl portion 20d, a drain trap conduit 40d, and a temporary storage tank. 50d. The bowl portion 20 is a part of the toilet body 10, and includes a filth receiving surface 201d for temporarily receiving the filth, a rim portion 202d for flowing cleaning water to the filth receiving surface 201d, and a waste trap pipe. A bowl outlet 203d for flowing into the passage 40d. The rim 202d is formed on the upper peripheral edge of the filth receiving surface 201d. A cleaning water supply hole 30d faces the rim portion 202d. The bowl outlet 203d is formed below the filth receiving surface 201d.

  The drain trap pipe 40d is a part that receives filth and washing water from the bowl part 20d and flows in the direction of the sewer pipe. The drain trap pipe 40d has an inlet 401d, a rising pipe 402d, and a down pipe 403d. The inlet portion 401d is a portion connected to a bowl outlet portion 203d formed below the filth receiving surface 201d of the bowl portion 20d. The inlet portion 401d receives filth and washing water from the bowl outlet portion 203d and flows it into the ascending pipeline 402d.

  The ascending pipeline 402d is a portion formed on the downstream side of the inlet portion 401d, and is a portion formed so as to extend upward from the inlet portion 401d. Therefore, the bowl outlet portion 203d, the inlet portion 401d, and the rising conduit 402d are connected to form a U-shaped conduit as a whole.

  The descending pipeline 403d is a portion formed on the downstream side of the ascending pipeline 402d, and is a portion formed so as to extend downward from the downstream end of the ascending pipeline 402d. Accordingly, the stored water WS stored in the U-shaped pipe formed by the bowl outlet part 203d, the inlet part 401d, and the rising pipe line 402d is connected to the rising pipe line 402d and the lower pipe line 403d. Can be accumulated. As shown in FIG. 2, when the flush toilet CSd is not in use, water is stored from the inlet portion 401d to at least a part of the ascending pipeline 402d to form the stored water WS, which is sealed by at least a part of the stored water WS. Forming water.

  The temporary storage tank 50d is a tank for drawing a part of the stored water WS from the drain trap pipe 40d and temporarily storing it as drawn water. The drain trap pipe 40d and the temporary storage tank 50d are connected by a lead-in pipe line 503d (first lead-in part), a bent part 508d (topmost part), and a lead-in pipe line 507d (second lead-in part).

  The lead-in conduit 503d is a portion connected to the drain trap conduit 40d. The lead-in conduit 503d extends while inclining upward from a portion connected to the drain trap conduit 40d. A bent portion 508d is connected to the drawing conduit 503d, and the bent portion 508d is connected to the drawing conduit 507d. The lead-in conduit 507d extends while being inclined downward from the portion connected to the bent portion 508d, and is connected to the upper end of the temporary storage tank 50d. A vent 50da is formed at an upper end of the temporary storage tank 50d so as to be separated from a portion connected to the lead-in conduit 507d.

  A drawing pump 505d is provided in the drawing line 503d. The drawing pump 505d is a turbo pump. An enlarged cross-sectional view of the drawing pump 505d is shown in FIG. As shown in FIG. 3, the drawing pump 505d has a motor 505da and an impeller 505db. As the motor 505da rotates, the impeller 505db rotates, sucking up water around the impeller 505db and feeding it to the motor 505da side. Accordingly, the drawing pump 505d is configured not to suck up water when there is no water around the impeller 505d.

  The lead-in conduit 503d is connected to a suction port 404d provided in the rising conduit 402d of the drain trap conduit 40d. The formation position of the suction port 404d will be described with reference to FIG. As shown in FIG. 4, the drain trap pipe 40d is formed to bend from the inlet 401d to the ascending pipe 402d. In the case of the present embodiment, the drain trap pipe 40d is bent along the surface PLa. The suction port 404d is formed at a position that passes through the central axis of the ascending pipeline 402 and penetrates the center of the surface PLb perpendicular to the surface PLa.

  Further, the lead-in conduit 503d is connected so that the portion immediately after branching from the drain trap conduit 40d is directed toward the upstream side of the drain trap conduit 40d. This state is schematically shown in the child 19. As shown in FIG. 5, when the suction pipe 503d is connected toward the upstream side of the ascending pipeline 402d, when the cleaning water flows through the ascending pipeline 402d and the filth is conveyed, It does not enter the drawing line 503d side, but rather flows toward the downstream side of the ascending line 402d so as to draw filth from the drawing line 503d.

  Returning to FIG. 2, the description will be continued. The drawn-in water stored in the temporary storage tank 50d can be returned to the drain trap pipe 40d. The temporary storage tank 50d and the drain trap line 40d are connected by a return line 509d, a return line 510d (first return part), a return line 511d (second return part), and a return line 504d.

  The return conduit 509d is a portion connected to the temporary storage tank 50d. The return conduit 509d extends in a substantially horizontal direction from the lower end of the temporary storage tank 50d. The return line 510d is connected to the return line 509d. The return line 510d extends so as to rise in a substantially vertical direction from a portion connected to the return line 509d. A return line 511d is connected to the return line 510d. The return line 511d extends while descending obliquely downward from the portion connected to the return line 510d. A return line 504d is connected to the return line 511d. The return conduit 504d is bent from a portion connected to the return conduit 511d and connected to the inlet 401d of the drain trap conduit 40d.

  A feedback pump 506d is provided between the return line 509d and the return line 510d. By driving the return pump 506d, the drawn water in the temporary storage tank 50d is returned to the drain trap pipe 40d.

  Next, a control configuration of the flush toilet CSd will be described with reference to FIG. FIG. 6 is a block diagram showing a control configuration of the flush toilet CSd. As shown in FIG. 6, the flush toilet CSd includes a control device 80 (control means), a water level detection means 801 in the temporary storage tank, a water level detection sensor 802 in the trap, a seating detection sensor 803, and a human body approach detection sensor. 804, trap trap filth sensor 805, temperature sensor 806, remote controller 807, retractable pump motor 808, feedback pump motor 809, toilet seat / toilet lid opening / closing means 810, measuring means 811, lamp / A speaker 812, a water supply valve 813, and a sanitary washing device 70d are provided.

  The water level detection means 801 in the temporary storage tank, the water level detection sensor 802 in the trap, the seating detection sensor 803, the human body approaching detection sensor 804, the filth detection sensor 805 in the trap, the temperature detection sensor 806, and the remote controller 807 have predetermined measurement signals and An instruction signal is output to the control device 80.

  The control device 80 exchanges predetermined measurement signals and control instruction signals with the retracting pump motor 808, the return pump motor 809, the toilet seat / toilet lid opening / closing means 810, and the measuring means 811. The control device 80 outputs predetermined control signals to the lamp / speaker 812, the water supply valve 813, and the sanitary washing device 70d.

  Subsequently, the washing operation of the flush toilet CSd will be described with reference to FIGS. 7, 8, 9, 10, 11, 12, 13, 14, 15, and 16. In the standby stage, as shown in FIG. 7, the accumulated water WS is stored up to the vicinity of the upper end of the rising pipe 402d of the drain trap pipe 40d. In the present embodiment, the uppermost part of the return pipe, which is the part where the return pipe 510d and the return pipe 511d are connected to each other, rather than the lower end position α of the flow path cross section at the top of the rising pipe 402d. The flow path cross-section lower end position β at the top is configured to be a high position. Further, the lower end position of the flow path cross section in the bent portion 508d that is the topmost part of the lead-in pipe line, rather than the lower end position β of the flow path cross section in the top part of the return pipe that is the part where the return pipe line 510d and the return pipe line 511d are connected It is comprised so that (gamma) may become a high position. In the standby state shown in FIG. 7, part of the accumulated water WS also flows into the return pipe 511d and enters the same height as the accumulated water in the drain trap pipe 40d.

  Then, as shown in FIG. 8, the drawing pump 505d is driven, water is drawn from the stored water WS and supplied to the temporary storage tank 50d as drawn water. The water drawn into the temporary storage tank 50d flows into the return pipe 509d. Since the return pipe 510d rises with respect to the return pipe 509d, the drawn-in water and the stored water are cut off by the air contained in the return pipe 510d.

  Subsequently, as shown in FIG. 9, the water level of the stored water WS is lowered, and it becomes impossible to draw water even if the drawing pump 505d is driven. Since the temporary storage tank 50d has a vent 50da, when the drawing pump 505d is stopped, the water drawn into the drawing line 503d returns to the drain trap line 40d (see FIG. 10). ).

  The state shown in FIG. 10 is a stage where preparations for receiving filth are completed. Subsequently, as shown in FIG. 11, the filth MB enters the stored water WS. Subsequently, as shown in FIG. 12, cleaning water is supplied from the cleaning water supply hole 30d to the bowl portion 20d, and the filth MB flows toward the ascending pipeline 402d.

  Subsequently, as shown in FIG. 13, the return pump 506d is driven to feed the drawn water in the temporary storage tank 50d to the drain trap pipe 40d side. When the return pump 506d is driven in this way, the water that is first connected to the stored water WS and enters the return line 511d is returned to the drain trap line 40d.

  When the drive of the feedback pump 506d is further continued from the state shown in FIG. 13, as shown in FIG. 14, the air that has separated the accumulated water and the drawn-in water is blown out into the drain trap pipe 40d. Finally, the drawn-in water is sequentially returned to the drain trap conduit 40d (see FIG. 15), and finally the drawn-in water is completely returned to the drain trap conduit 40d until air is ejected (see FIG. 16).

  In this embodiment, since the sanitary washing device 70d is provided, the stored water can be replenished. If the water is replenished in this way, it becomes easy to control the drive of the drawing pump 505d and the feedback pump 506d, assuming that there is always a certain amount of water.

  The replenishment control of the stored water using the sanitary washing device 70d will be described with reference to FIG. FIG. 17 is a flowchart showing stored water replenishment control. In step S31, timing by the measuring means 811 that is a timer starts. In step S32 following step S31, the timer specified value is stored in the standby time. In step S33 following step S32, the measuring means 811 which is a timer is reset.

  In step S34 subsequent to step S33, it is determined whether or not the storage water replenishment mode is set. If it is in the accumulated water replenishment mode, the process proceeds to step S36, and if it is not in the accumulated water replenishment mode, the process proceeds to step S35. In step S35, the time measurement by the measuring means 811 is stopped.

  In step S36, it is determined whether toilet cleaning has been performed. If toilet cleaning has been performed, the process returns to step S33, and if toilet cleaning has not been performed, the process proceeds to step S37. In step S37, it is determined whether the timer measured value by the measuring means 811 exceeds the timer specified value. If the timer measurement value does not exceed the timer specified value, the process returns to step S36. If the timer measurement value exceeds the timer specified value, the process proceeds to S38.

  In step S38, the measuring means 811 that is a timer is reset. In step S39 following step S38, the timer specified value is stored in the water discharge time. In step S40 subsequent to step S39, the sanitary washing device 70d, which is a stored water replenishing means, is operated, and cleaning water is supplied from the cleaning nozzle 701 to the stored water WS.

  In step S41 following step S40, it is determined whether or not the timer measurement value by the measuring means 811 exceeds the timer specified value. If the timer measurement value does not exceed the timer specified value, the process of step S41 is repeated. If the timer measurement value exceeds the timer specified value, the process proceeds to S42. In step S42, the operation of the sanitary washing device 70d which is the stored water replenishing means is stopped.

  As described above, the flush toilet CSd according to the present embodiment is a flush toilet that temporarily receives filth and discharges it together with wash water, and has a bowl portion having a filth receiving surface 201d for temporarily receiving filth. 20d, cleaning water supply means for supplying cleaning water to the bowl portion 20d (water supply valve 813, cleaning water supply hole 30d), an inlet portion 401d connected below the bowl portion 20d, and extending upward from the inlet portion 401d And a descending pipeline 403d formed so as to extend downward from the end of the ascending pipeline 402d. When not in use, water is provided from the inlet 401d to at least a part of the ascending pipeline 402d. A drain trap pipe 40d that forms sealed water by at least a part of the stored water WS and a part of the stored water WS Tsu pull the pull water from the pull line 40d, comprising a reservoir water use mechanism for feeding back the drawn-pull water into the bowl portion 20d or the drain trap pipe 40d, a.

  The stored water utilization mechanism includes a temporary storage tank 50d for temporarily storing the drawn-in water, and a draw-in pump 505d (withdrawing means) for drawing a part of the stored water WS as drawn-in water from the drain trap pipe 40d to the temporary storage tank 50d. And a return pump 506d (feedback means) for returning the drawn-in water temporarily stored in the temporary storage tank 50d to the bowl portion 20d or the drain trap pipe 40d, and even if the drawing pump 505d is driven, There is a breakage prevention means that does not lower the height of the sealed water formed by the water WS below the height at which the water WS is broken.

  The flush toilet CSd according to the present embodiment includes a drain trap conduit 40d, and the drain trap conduit 40d extends upward from the inlet portion 401d and an inlet portion 401d connected to the bottom of the bowl portion 20d. The rising pipe 402d is formed, and the down pipe 403d is formed to extend downward from the end of the rising pipe 402d. When not in use, water is stored from at least a part of the inlet 401d to the ascending pipeline 402d to form the stored water WS, and the sealed water is formed by at least a part of the stored water. The sealed water formed in the drain trap pipe 40d plays a role of preventing odors from the sewer pipe from entering the toilet room and preventing insects from entering the toilet room. In order to fulfill this role with certainty, the sealing depth of the sealing water formed in the drain trap pipe 40d is set so that the sealing water does not run out due to evaporation of the stored water forming the sealing water.

  On the other hand, when attention is paid to the use of the flush toilet CSd, the filth MB temporarily received by the bowl portion 20d falls below the bowl portion 20d and is temporarily stored in the drain trap pipe 40d inlet. In this state, cleaning water is supplied by the cleaning water supply means, and the waste MB flows through the drain trap pipe 40d to the sewer pipe side. Therefore, a part of the stored water WS that forms the sealed water in the drain trap pipe 40d is used for preventing the sealed water from being cut off when not in use.

  On the other hand, the filth MB received by the bowl portion 20d during use is temporarily stored near the inlet of the drain trap pipe 40d, and then washed away by washing water. In the discharge of the filth MB, the water stored in the upstream side (bowl portion 20d side) from the periphery of the filth and the cleaning water supplied by the cleaning water supply means contribute to the downstream side from the filth periphery of the drain trap pipe 40d. The stored water in the area does not necessarily contribute to the discharge of filth. If attention is paid to the characteristics of the drainage trap conduit 40d of the flush toilet CSd during use and non-use as described above, the pooled water for forming the sealed water is stored in the same manner during use and non-use. There is no need to keep it, and there is room to devise how to store it when it is used and when it is not used.

  Therefore, in the present embodiment, a stored water utilization mechanism is provided that draws part of the stored water WS as drawn water from the drain trap pipe 40d and returns the drawn water to the bowl portion 20d or the drain trap pipe 40d. . With this stored water utilization mechanism, when the bowl portion 20d temporarily receives the filth, and then drains it together with the cleaning water, the return pump 506d is driven after the drawing pump 505d is driven. Accordingly, when not in use, the retained water WS is retained with a certain margin so as to surely form a sealed water. However, when flowing filth, the drawn water is not affected by the filth by driving the suction pump 505d first. Is stored in the temporary storage tank 50d as drawn water. Since the return pump 506d returns the drawn water to the bowl portion 20d or the drain trap pipe 40d, the drawn water can contribute to the conveyance of the filth.

  Furthermore, in this embodiment, even if the drawing-in pump 505d is driven, a breakage prevention means is provided that does not lower the height of the sealed water formed by the stored water below the breakage height. As described above, the draw-in pump 505d draws a part of the stored water and introduces it into the temporary storage tank 50d. However, the amount of the stored water varies depending on the type of the flush toilet CSd. If more stored water is to be used, it is necessary to adjust the stored water use mechanism according to each flush toilet. In particular, when the drawing pump 505d draws the stored water, it should be avoided that the sealed water runs out even for a short time. Therefore, by providing a means for preventing breakage, the height of the sealed water formed by the stored water is prevented from being lowered below the height for breaking. In this way, regardless of the amount of water drawn in by the drawing pump 505d, by providing a tear-preventing means for securing sealed water, the difference in the amount of stored water depending on the type of flush toilet or the drawing pump 505d Even if there is an excessive amount of drawn-in water, sealed water can be reliably secured. Accordingly, it is possible to provide a flush toilet that does not cause the seal water to run out while improving the water-saving performance by devising the handling of the stored water in the drain trap pipe 40d.

  In addition, the breakage prevention means has a lower limit height that is the lower limit of the height at which the sealed water formed by the stored water avoids the breakage when the draw pump 505d draws the drawn water from the stored water WS. If it reaches | attains, it will be comprised so that a drawing-in pump may not draw in drawing-in water from the stored water WS.

  As described above, when the stored water is drawn down to the lower limit of the height at which the breakage can be avoided, the drawing of the drawn water from the stored water by the drawing pump 505d is regulated, so that it is possible to surely avoid running out of the sealed water.

  The drawing pump 505d is a turbo type pump, and is configured to draw drawing water from the stored water WS. When the height of the sealed water reaches the lower limit height, An air gap is formed between the mold pump and the stored water, and the turbo pump pump sucks air so that the intake pump 505d is prevented from drawing in the drawn water from the stored water WS.

  In this way, by using a turbo pump as the pull-in pump 505d, it is possible to avoid the occurrence of running out of sealed water by utilizing the fact that water cannot be pulled in when the turbo pump pulls in air. When the height of the sealed water formed by the accumulated water reaches the lower limit height, the turbo type pump is arranged so as to draw in air, so that the turbo type pump can no longer draw in the accumulated water. Can be reliably avoided.

  In addition, the temporary storage tank 50d has a water volume that can be stored so that the height of the sealed water does not fall below the lower limit height even if the water intake pump 505d draws this amount of water from the stored water WS. It is also preferable to be configured.

  In this preferred embodiment, the amount of water that can be stored in the temporary storage tank 50d is limited so that even if the amount of water drawn in is drawn from the stored water WS, it is not broken. Can be reliably prevented and breakage can be reliably avoided.

  In addition, the stored water utilization mechanism has drawing pipes 503d and 507d that connect the drain trap pipe 40d and the temporary storage tank 50d, and the drawing pipes 503d and 507d are drawn water stored in the temporary storage tank 50d. And a drawing structure that does not connect the drawn water remaining in the drawn-in pipe 503d (see FIG. 9), and when the drawn-in water from the stored water WS by the drawn-in pump 505d stops, the drawn-in pipe The drawn water remaining in the channel 503d is configured to return to the drain trap pipe.

  Thus, it has an edge cutting structure that separates the drawn-in water stored in the temporary storage tank 50d and the drawn-in water remaining in the drain trap pipe 40d and the drawn-in pipe 503d, and is drawn from the stored water WS. Since the drawn-in water remaining in the drawing-in pipe line 503d is returned to the drain trap pipe 40d when it stops, it is possible to more reliably prevent the sealed water from being cut.

  Further, when the draw-in pump 505d continues to draw the drawn-in water from the draw-in pipelines 503d and 507d into the temporary storage tank 50d, the return pump 506d ensures that the height of the sealed water does not fall below the lower limit height. In addition, it is also preferable to return the drawn-in water having an instantaneous flow rate equivalent to the instantaneous flow rate of the drawn-in water drawn into the temporary storage tank 50d by the drawn-in pump 505d.

  If comprised in this way, even if it is a case where the drawing-in pump 505d continues drawing from the stored water WS, the drawing-in which drawing-in pump 505d draws in so that the height of sealed water may not fall below lower limit height. Since the drawn-in water with the instantaneous flow rate equivalent to the instantaneous flow rate of water is returned, it is possible to more reliably prevent the sealing water from running out.

  In the present embodiment, a circulation path configured to circulate the drawn water between the bowl portion 20d or the drain trap pipe 40d and the temporary storage tank 50d (the drawing pipe 503d, the bent part 508d, the drawing pipe). Path 507d, return line 504d, return line 509d, return line 510d, and return line 511d).

  By having this circulation path, the drawing water drawn by the drawing pump 505d from the stored water WS in the drain trap pipe 40d is sent to the temporary storage tank 50d, and is fed to the bowl portion 20d or the drain trap pipe 40d by the return pump 506d. Returned. Therefore, even if the drawing water is excessively supplied by the drawing pump 505d, the drawing water can be returned by the feedback pump 506d without excessively collecting the drawing water in the temporary storage tank 50d. Therefore, the performance of the stored water utilization mechanism can be exhibited without placing an unnecessary burden on the temporary storage tank 50d.

  Further, since the drawing pump 505d constituting the drawing means and the feedback pump 506d constituting the feedback means are provided independently, the operation of the drawing pump 505d optimal for drawing the drawing water from the stored water WS, The operation of the return pump 506d that is optimal for returning the drawn water from the storage tank 50d can be combined. Therefore, it is possible to more effectively function a stored water utilization mechanism that draws a part of the stored water WS as drawn water from the drain trap pipe 40d and returns the drawn water to the bowl portion 20d or the drain trap pipe 40d. it can.

  Also, in the circulation path, after the return pump 506d is driven, the water passing through the bowl portion 20d or the drain trap pipe 40d does not flow back through the return pipes 504d, 509d, 510d, and 511d and enter the temporary storage tank 50d. Backflow preventing means acting on the

  Since the return pipes 504d, 509d, 510d, and 511d for leading the drawn water from the temporary storage tank 50d to the bowl portion 20d or the drain trap pipe 40d are provided, the inside of the temporary storage tank 50d and the drain trap pipe 40d are communicated with each other. There is a possibility. When the inside of the temporary storage tank 50d and the drain trap pipe 40d communicate with each other, when the water level on the drain trap pipe 40d side becomes higher than the water level in the temporary storage tank 50d, the water on the drain trap pipe 40d side There is a risk of backflow in the temporary storage tank 50d. Therefore, by providing a backflow prevention means so that the water passing through the bowl portion 20d or the drain trap pipe 40d does not flow back through the return flow paths 504d, 509d, 510d, and 511d, the backflow of sewage to the temporary storage tank 50d is ensured. It is preventing.

  The backflow prevention means includes a return line 510d that is a first return part connected while the return line descends from the top to the temporary storage tank 50d, and a bowl part 20d or a drain trap line 40d from the top. And a return pipe line 511d that is a second return part that is connected while descending, and the flow path cross-section lower end β at the top is formed at a position higher than the flow path cross-section lower end α at the top of the ascending pipe 402d. Furthermore, after the feedback pump 506d is driven, a bent portion constituted by a feedback conduit 510d (first feedback portion) and a feedback conduit 511d (second feedback portion) with the topmost portion interposed therebetween. By introducing air into the tank, backflow to the temporary storage tank 50d is prevented (see FIG. 12).

  In the present embodiment, the water level rises to the highest position at the top of the ascending pipeline 402d. Therefore, the bend formed at the topmost part of the return pipe is formed by forming the topmost cross section lower end β of the return pipe at a position higher than the topmost cross-section bottom end α of the ascending pipe 402d. It is possible to perform edge cutting between the return line 510d (first return part) side and the return line 511d (second return part) side by air. Therefore, it is possible to reliably prevent the backflow of sewage to the temporary storage tank 50d.

  Further, in the present embodiment, the driving of the feedback pump 506d is continued even after the water passing through the return pipe is discharged from the temporary storage tank 50d so that the effect of the backflow prevention means is achieved, and the continuous driving of the feedback pump 506d Air is introduced into the bent portion (see FIGS. 15 and 16).

  In this way, air is introduced into the bent portion by continuing to drive the return pump 506d even after the water passing through the return pipe is discharged from the temporary storage tank 50d, so that means for introducing air into the bent portion is separately provided. The backflow prevention means can be configured without providing it. Therefore, the flush toilet CSd can be downsized with a simple configuration.

  Further, when the drawn water is returned from the temporary storage tank 50d to the bowl portion 20d or the drain trap pipe 40d so as to achieve the effect of the backflow prevention means, the drawn water stored in the temporary storage tank 50d is pushed out and flowed. Thus, the back flow to the temporary storage tank 50d is prevented by returning the water in the return pipe 511d (second return part), the air in the bent part, and the drawn water in the return pipe 510d (first return part) in this order. doing.

  In this way, the air, which is a compressive fluid, is compressed by pushing air between the water in the return pipe 511d (second feedback part) and the drawn-in water in the feedback pipe 510d (first feedback part). The state returns to the drain trap pipe 40d. Therefore, the filth can be washed away by the pressurized air, and the filth discharge effect can be enhanced.

  Further, in the present embodiment, the draw-in pump 505d draws part of the accumulated water WS as draw-in water from the ascending pipeline 402d, and draws in draw-in water while suppressing suction of filth flowing through the ascending pipeline 402d. It is configured.

  In this embodiment, since a part of the stored water WS is drawn in as drawn water, if the filth in the stored water is drawn together with the water, the drawn-in conduit 503d is narrowed and closed, or the inside of the temporary storage tank 50d becomes dirty. There is a fear. Therefore, by configuring the drawing-in means so as not to suck the filth flowing through the ascending pipeline 402d, it is possible to prevent the drawing-in pipeline 503d from being blocked and to prevent filth from entering the temporary storage tank 50d. Can do.

  In this embodiment, in order to suppress this, the drawn water is drawn from the rising pipe 402d above the height at which the stored water can form the sealed water in the drain trap pipe 40d.

  It is assumed that filth advances from the bowl 20d side through the drain trap pipe 40d and enters the ascending pipe 402d. Therefore, it is possible to reliably suppress the inflow of filth by configuring the intake water to be drawn from the stored water at a position higher than the height at which the sealing water can be formed in the ascending pipeline 402d.

  In addition, the lead-in pipe line 503d is connected to the drain trap pipe line 40d from the side so as to penetrate the surface PLa along which the drain trap pipe line 40d is bent, and the drain trap pipe line 40d and the temporary storage tank 50d communicate with each other. The drawn water is drawn into the temporary storage tank 50d from the drain trap pipe 40d through the drawing pipe line 503d.

  In the present embodiment, the drain trap pipe 40d is formed from the upstream side to the downstream side while bending to form a sealed water. In the portion where the plane PLa that is bent and the drain trap pipe 40d intersects, the tendency that the water flowing through the drain trap pipe 40d is directed to the outside becomes strong. Therefore, when drawing the drawn-in water from the stored water, the drawing-in pipe 503d is provided so as to be connected to the drain trap pipe 40d from the side so as to penetrate the surface PLa along which the drain trap pipe 40d is bent. It is configured so that filth is difficult to be drawn in (see FIG. 4).

  Further, the lead-in conduit 503d is connected to the drain trap conduit 40d so that the lead-in conduit 503d immediately after branching from the drain trap conduit 40d is directed toward the upstream side of the drain trap conduit 40d (see FIG. 5).

  The filth flowing through the drain trap pipe 40d flows from the upstream side on the bowl 20d side of the drain trap pipe 40d toward the downstream side. Therefore, by connecting the lead-in pipe line 503d so as to face the upstream side with respect to the drain trap pipe line 40d, the direction in which the lead-in pipe line 503d draws the drawn-in water can be opposite to the direction in which the filth flows. It is possible to more reliably suppress the entry of filth.

  Further, in this embodiment, after the bowl portion 20d receives the filth, the cleaning water supplied to the bowl portion 20d by the cleaning water supply means is drawn into the temporary storage tank 50d when it flows through the drain trap conduit 40d. Abnormal intrusion suppression means for suppressing this is provided.

  In the present embodiment, the water to be drawn in by the drawing pump 505d is a part of the stored water WS. Therefore, if the washing water flowing filth is drawn in, it becomes an abnormal intrusion that is not originally assumed. If such an abnormal intrusion of cleaning water is overlooked, there is a concern about the intrusion of filth and the reduction of water-saving performance. Therefore, by providing an abnormal intrusion suppression means, it is possible to prevent normal washing water from entering the stored water utilization mechanism.

  Specifically, the flow path resistance of the lead-in pipe line 503d extending from the drain trap pipe line 40d to the temporary storage tank 50d is made higher than the flow path resistance of the drain trap pipe line 40d. In this way, it is possible to prevent the normal washing water from entering the inlet pipe 503d abnormally with a simple configuration in which the passage resistance of the inlet pipe 503d is higher than that of the drain trap pipe 40d. Can do.

  Moreover, the flow path cross-section lower end γ at the topmost part of the lead-in pipe 503d is formed at a position higher than the flow path cross-section lower end α at the topmost part of the ascending pipe 402d. By configuring in this way, even if normal washing water is drawn into the lead-in conduit 503d, it is possible to reliably suppress the washing water from flowing into the temporary storage tank 50d.

  In addition, the lead-in pipe line has a bent part 508d formed by a lead-in pipe line 503d (first pull-in part) and a lead-in pipe line 507d (second pull-in part) across the top. In this manner, by forming the bent portion 508d at the topmost portion, the flow path resistance can be further increased, and the inflow of cleaning water to the temporary water storage tank 50d can be reliably suppressed.

  Further, the topmost portion is provided so as to be substantially the same height as the cleaning water supply hole 30d formed in the rim portion 202d of the bowl portion 20d, and the drawing conduit 503d (first drawing portion) is drained from the topmost portion. The pull-in conduit 507d (second pull-in portion) is formed as a portion connected while descending from the top toward the temporary storage tank 50d, while being formed as a portion connected while descending toward the trap conduit 40d.

  In this way, the lead-in pipe line 503d (first lead-in part) is formed as a part connected while descending toward the drain trap pipe, while the lead-in pipe line 507d (second lead-in part) is directed to the temporary storage tank 50d. Therefore, the flow path resistance can be increased by making the angle of the bent portion 508d a steep angle. Furthermore, since the position of the temporary storage tank 50d can be lowered by setting the topmost portion to a height equivalent to the rim portion 202d, the degree of freedom in arrangement can be increased.

  Further, in the present embodiment, by providing the drawing pump 505d in the middle of the drawing line 503d, the flow resistance of the drawing line 503d can be further increased, and the drawing of the cleaning water can be more reliably suppressed.

  In addition, the driving of the drawing pump 505d is started, and the driving is stopped after a predetermined time has elapsed. In this way, by limiting the driving of the drawing pump 505d to a predetermined time, the amount of water drawn into the temporary storage tank 50d can be reliably kept within a predetermined amount. Accordingly, it is possible to reliably prevent the water stored in the drain trap pipe 40d from being drawn more than necessary, and the sealed water formed by the stored water from being broken.

  Further, a sanitary washing device 70d is provided as a sealing water adding means for supplying water separately from the stored water so that the height of the sealing water driven by the pull-in pump 505d does not fall below the lower limit of the height at which the water is broken. .

  In this way, water is supplied by the sanitary washing device 70d as a sealing water adding means separately from the stored water, so that even when the stored water is evaporated and the amount of water is reduced, a predetermined amount of stored water is recovered. Can do. Therefore, even if the driving time of the drawing pump 505d is set to a predetermined time, it is possible to reliably avoid excessively drawing in the accumulated water and causing the sealed water to run out.

  Further, since water is supplied separately from the stored water by the sanitary washing device 70d, additional water injection for preventing breakage can be performed without adding a new water supply device.

  The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. In other words, those specific examples that have been appropriately modified by those skilled in the art are also included in the scope of the present invention as long as they have the characteristics of the present invention. For example, the elements included in each of the specific examples described above and their arrangement, materials, conditions, shapes, sizes, and the like are not limited to those illustrated, but can be changed as appropriate. Moreover, each element with which each embodiment mentioned above is provided can be combined as long as technically possible, and the combination of these is also included in the scope of the present invention as long as it includes the features of the present invention.

MB: filth WS: stored water CSd: flush toilet 10d: toilet main body 20d: bowl portion 30d: wash water supply hole 40d: drain trap pipe 50d: temporary storage tank 70d: sanitary washing device 201d: filth receiving surface 202d: rim Part 203d: Bowl outlet part 401d: Inlet part 402d: Ascending line 403d: Down line 404d: Suction port 503d: Retraction line (first retraction part)
504d: Return line 505d: Pull-in pump 506d: Return pump 507d: Pull-in line (second pull-in part)
508d: bent portion 509d: return pipeline 510d: return pipeline (first feedback portion)
511d: Return line (second return part)
701d: Cleaning nozzle

Claims (9)

A flush toilet that temporarily receives filth and discharges it together with wash water,
A bowl portion having a waste receiving surface for temporarily receiving the waste;
Cleaning water supply means for supplying cleaning water to the bowl part;
An inlet connected to a lower portion of the bowl, a rising conduit formed to extend upward from the inlet, and a descending conduit formed to extend downward from the end of the rising conduit In addition, when not in use, water is stored from at least a part of the ascending pipe to the reservoir to form a reservoir, and a drain trap conduit that forms a sealed water by at least a part of the reservoir,
A part of the accumulated water is drawn from the drain trap pipe as drawn water, and the collected water utilization mechanism for returning the drawn water to the bowl part or the drain trap pipe,
The stored water utilization mechanism is
A temporary storage tank for temporarily storing the incoming water;
A drawing-in means for drawing a part of the stored water as drawn-in water from the drain trap pipe to the temporary storage tank;
A return means for returning the drawn-in water temporarily stored in the temporary storage tank to the bowl portion or the drain trap pipe, and
After the bowl portion is received dirt, the washing water the cleaning water supply means washing water supplied to the bowl portion, Oite as it flows is drained the drain trap pipe, the drawn into a temporary storage tank A flush toilet characterized by having an abnormal intrusion suppression means in which the flow rate of the water becomes smaller than the flow rate of the wash water flowing through the drain trap pipe .   The abnormal intrusion suppression means is configured by increasing the flow path resistance of the lead-in pipe line from the drain trap pipe to the temporary storage tank, higher than the flow path resistance of the drain trap pipe. The flush toilet according to claim 1.   The flush toilet according to claim 2, wherein the lower end of the flow path cross section at the topmost part of the lead-in pipe line is formed at a position higher than the lower end of the cross section of the flow path at the topmost part of the ascending pipe line.   The flush toilet according to claim 3, wherein the lead-in conduit has a bent portion formed by a first lead-in portion and a second lead-in portion with the topmost portion interposed therebetween. The topmost part is provided so as to be substantially the same height as the washing water supply port formed in the rim part of the bowl part,
While the first lead-in part is formed as a part connected while descending from the top to the drain trap pipe,
The flush toilet according to claim 4, wherein the second drawing-in portion is formed as a portion connected while descending from the topmost portion toward the temporary storage tank. The lead-in pipe is connected to the drain trap pipe from the side so as to penetrate the surface along which the drain trap pipe is bent, and communicates the drain trap pipe with the temporary storage tank, The flush toilet according to claim 3, wherein the flush toilet is configured to incline upward from a portion connected to the drain trap pipe .   To the upstream side of the drain trap pipe, the pull-in pipe is connected to the drain trap pipe so that the pull-in pipe immediately after branching from the drain trap pipe is directed. The flush toilet according to claim 6. The pull-in means is constituted by a pull-in pump that draws the pull-in water from the stored water,
The flush toilet according to claim 3, wherein the drawing pump is provided in the middle of the drawing line. The return means has a return line that is a line for returning the drawn-in water temporarily stored in the temporary storage tank to the bowl part or the drain trap line,
A first return portion connected while descending from the top to the temporary storage tank; and a second return portion connected while descending from the top toward the bowl portion or the drain trap conduit. Composed of
While the lower end of the flow path cross section at the top of the lead-in pipe is provided at a position higher than the lower end of the cross section of the flow path at the top of the rising pipe,
The lower end of the channel cross section at the top of the return pipe is higher than the lower end of the cross section of the channel at the top of the rising pipe, and is lower than the lower end of the cross section of the channel at the top of the lead-in pipe. The flush toilet according to claim 3, wherein

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