Water closet

Abstract

To provide a water closet capable of early discharging washing water from a rim water discharge port to sufficiently wash a bawl part.SOLUTION: The water closet includes a toilet bowl body 2 including a bowl part 6 having a dirt receiving surface 18 and a rim part 20, and a drain trap pipeline 8 for discharging dirt, a washing water tank 4 formed with a drain port for storing washing water to wash the toilet bowl body 2, and draining the stored washing water to the toilet bowl body 2, a rim water discharge port 10 provided in a rim part 20 for discharging washing water to the bowl part 6, and a rim water channel 12 for connecting the drain port of the washing water tank 4 to the rim water discharge port 10. In the rim water channel 12, a throttle part 28 is provided having a flow path cross section area smaller than the opening cross section area of the rim drain port 4b of the washing water tank 4. On the upstream side of the throttle part 28, a water pool part 26 is provided in which the washing water is pooled.SELECTED DRAWING: Figure 7

Description

[Technical Field]

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

[0002] As described in Patent Document 1, there has been known a flush toilet equipped with a flush water tank that stores flush water, a main conduit that connects to the flush water tank's drain outlet, a rim conduit that branches off from the downstream end of this main conduit and connects to a rim spout, and a jet conduit that branches off from the downstream end of the main conduit and connects to a jet spout. In such a flush toilet, when flush water is supplied from the flush water tank to the main conduit, it flows into the jet conduit and then into the rim conduit. For this reason, flush water is discharged from the jet spout before being discharged from the rim spout. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-168994 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the flush toilet described in Patent Document 1 mentioned above, flush water is discharged from the jet spout before being discharged from the rim spout, so the time over which the bowl is cleaned with flush water discharged from the rim spout is relatively short. If the time over which the bowl is cleaned is short in this way, there is a possibility that the bowl may not be cleaned sufficiently.

[0005] Therefore, an object of the present invention is to provide a flush toilet that can discharge flush water from the rim spout early and thoroughly clean the bowl portion. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention is a flush toilet that is flushed with flush water to discharge waste, and comprises a toilet body equipped with a bowl section having a bowl-shaped waste receiving surface and a rim section formed above this waste receiving surface, a drain trap pipe line formed below the bowl section for discharging waste, a flush water tank that stores flush water for flushing the toilet body and is formed with a drain outlet for discharging the stored flush water into the toilet body, a rim spout formed in the rim section and spouts flush water towards the bowl section, and a rim water conduit that connects the flush water tank's drain outlet and the rim spout, and the rim water conduit is characterized in that a throttle section is provided in the rim water conduit with a flow path cross-sectional area that is smaller than the opening cross-sectional area of ​​the flush water tank's drain outlet, and a water storage section is provided upstream of this throttle section in which flush water collects.

[0007] According to the present invention configured in this way, the rim water conduit is provided with a throttle section whose flow path cross-sectional area is smaller than the opening cross-sectional area of ​​the flush water tank's drain outlet, and a water storage section where flush water collects is provided upstream of this throttle section, so that flush water supplied from the flush water tank's drain outlet pushes the flush water that has collected in the water storage section downstream, and the throttle section increases the flow rate so that it can be discharged from the rim spout.As a result, flush water can be discharged from the rim spout early, allowing the bowl section to be thoroughly cleaned.

[0008] In the present invention, the water reservoir preferably has, on its downstream side, a rising bottom surface that slopes upward toward the throttle portion.

[0009] According to the present invention configured in this manner, the water storage section has an upwardly sloping bottom surface on its downstream side that slopes upward toward the throttling section, so that the cleaning water stored in the water storage section can be smoothly swept away toward the throttling section.

[0010] Also, in the present invention, the lowest end of the water reservoir is preferably located forward of the centre of the flush water tank's drain outlet.

[0011] According to the present invention configured in this manner, the lowest end of the water storage section is positioned forward of the center of the drain outlet of the flush water tank, so that flush water stored in the water storage section can be pushed forward.

[0012] In the present invention, the water reservoir is preferably located vertically below the drain outlet of the flush water tank.

[0013] According to the present invention configured in this manner, the water storage section is positioned vertically below the drain outlet of the flush water tank, so that the flush water supplied from the drain outlet of the flush water tank collides with the flush water stored in the water storage section, thereby forcing the flush water stored in the water storage section downstream.

[0014] Also, in the present invention, the water storage section preferably has a descending bottom surface on its upstream side that slopes downward toward the downstream side, and this descending bottom surface is positioned vertically below the drain outlet of the flush water tank.

[0015] According to the present invention configured in this manner, the water storage section has a descending bottom surface on its upstream side that slopes downward toward downstream, and this descending bottom surface is positioned vertically below the drain outlet of the flush water tank, so that the flow direction of the flush water changes when it collides with the descending bottom surface, and the flush water stored in the water storage section can be pushed downstream.

[0016] In the present invention, the lowest end of the water reservoir is preferably located above the drain trap pipe line.

[0017] According to the present invention configured in this manner, the lowest end of the water storage section is positioned above the drain trap pipe, so that the amount of flush water stored in the water storage section can be such that it can be washed away by the flush water supplied from the drain outlet of the flush water tank, without making the water storage section too deep.

[0018] In the present invention, the upper surface of the rim water conduit is preferably formed to be substantially horizontal.

[0019] With this configuration of the present invention, the upper surface of the rim conduit is formed almost horizontally, allowing air that has accumulated near the upper surface of the rim conduit to flow smoothly downstream.

[0020] In addition, in the present invention, it is preferable that the flushing machine further comprises a jet water outlet located below the bowl portion for ejecting flush water toward the entrance of the drain trap pipe, and a jet water conduit connecting the jet drain outlet of the flush water tank to the jet water outlet, and the drain outlet of the flush water tank is made up of a rim drain outlet connected to the rim water conduit and a jet drain outlet connected to the jet water conduit, with the rim drain outlet being positioned forward of the jet drain outlet.

[0021] According to the present invention configured in this manner, since the outlet is positioned forward of the rim drain outlet and the jet drain outlet, flush water can be discharged from the rim water discharge outlet at an early stage.

[0022] In the present invention, the downstream end of the throttle portion is preferably directly connected to the rim spout port.

[0023] According to the present invention configured in this manner, the downstream end of the throttle section is directly connected to the rim spout port, so flush water can be discharged from the rim spout port early on. [Effects of the Invention]

[0024] According to the flush toilet of the present invention, flush water can be discharged from the rim spout early on, allowing the bowl portion to be thoroughly cleaned. [Brief explanation of the drawings]

[0025] [Figure 1] 1 is a plan view of a flush toilet according to an embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 2 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an enlarged cross-sectional view of a part of FIG. 3. [Figure 5] FIG. 5 is a cross-sectional view taken along line VV in FIG. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 4. [Figure 7] 1 is a schematic diagram showing flush water flowing through the reservoir section and throttle section immediately after flushing begins in a flush toilet according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0026] A flush toilet according to an embodiment of the present invention will now be described with reference to the drawings. First, the basic structure of a flush toilet 1 according to an embodiment of the present invention will be explained with reference to FIGS. Fig. 1 is a plan view of a flush toilet according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1. In Fig. 1, the dashed lines indicate the rim water conduit 12 and the jet water conduit 18, and in Fig. 2, the two-dot chain line indicates the rim water conduit 12 and the dashed line indicates the jet water conduit 16. In this specification, when viewing the flush toilet from the front, the near side will be referred to as the front side, the far side as the rear side, the right side as the right side, and the left side as the left side.

[0027] As shown in Figures 1 and 2, the flush toilet 1 according to an embodiment of the present invention is a siphon jet type flush toilet that uses a jet of water to create a siphon action to discharge waste. Note that while the flush toilet 1 according to an embodiment of the present invention will be described as a siphon jet type flush toilet, it is not limited to this form and can take other forms, such as a wash-down toilet that flushes away waste with the flow of water caused by a drop in water, or a siphon type flush toilet that discharges waste by creating a siphon action with a rim water discharge.

[0028] As shown in Figure 1, a flush toilet 1 comprises a toilet body 2 and a flush water tank 4 located at the upper rear of the toilet body 2. The toilet body 2 and flush water tank 4 are integrally formed from ceramic. A lever handle (not shown) is provided on the flush water tank 4, and the user operates the lever handle to flush the toilet.

[0029] The toilet body 2 is equipped with a bowl portion 6 that receives waste, a drain trap pipe 8 that is located at the bottom of the bowl portion 6 and that discharges waste by siphon action, a rim spout 10 that spouts water from the rim, a rim water conduit 12 that supplies flush water to the rim spout 10, a jet spout 14 that spouts water in a jet, and a jet water conduit 16 that supplies flush water to the jet spout 14. Note that in the flush toilet 1 according to the embodiment of the present invention, the rim water conduit 12 and the jet water conduit 16 are provided separately, but this is not the only embodiment, and the rim water conduit 12 and jet water conduit 16 may also be configured as a single water conduit.

[0030] Bowl portion 6 has a bowl-shaped waste receiving surface 18, a rim portion 20 that is formed along the upper edge of bowl portion 6 and forms an inner circumferential surface 20a that overhangs inward, and a shelf surface 22 formed between waste receiving surface 18 and rim portion 20. Bowl portion 6 also has a pot portion 24 that is formed in the area below waste receiving surface 18 and connected to drain trap pipe 8. A water seal W is formed inside pot portion 24.

[0031] The drain trap pipe 8 has an inlet 8a, an ascending pipe 8b extending upward from the inlet 8a, a descending pipe 8c extending downward from the ascending pipe 8b, and a top 8d located between the descending pipe 8c and the ascending pipe 8b and defining the seal water level. The lower end of the descending pipe 8c of the drain trap pipe 8 is connected to a drain pipe (not shown) via a drain socket (not shown).

[0032] The rim spout 10 is formed in the rim portion 20, and is positioned on the rear side of the bowl portion 6 and near the center in the left-right direction. Flush water is spouted from the rim spout 10 along the inner circumferential surface 20a of the rim portion 20, and swirls counterclockwise on the ledge surface 22 along the inner circumferential surface 20a of the rim portion 20. As the flush water swirls on the ledge surface 22 in this way, the flush water flows down from the ledge surface 22 onto the waste receiving surface 18, cleaning the waste receiving surface 18. Note that while the flush toilet 1 according to the embodiment of the present invention has been described as having only one rim spout 10, the present invention is not limited to this configuration and other configurations are also possible, for example, a configuration in which two or more rim spouts are provided.

[0033] One end of the rim conduit 12 is connected to the rim drain outlet 4b formed in the bottom surface 4a of the flush water tank 4, and the other end is connected to the rim spout 10. In a plan view, the rim conduit 12 is formed so that it extends forward from the rim drain outlet 4b of the flush water tank 4, bends gently to the right, and then bends at an almost right angle to the left (see Figure 1). Flush water is supplied to the rim conduit 12 from the flush water tank 4, and the head pressure of this flush water causes flush water to be spouted from the rim spout 10.

[0034] Jet water spout 14 is formed in the bottom of bowl portion 6. Jet water spout 14 is positioned opposite inlet 8a of drain trap pipe 8 and is directed toward inlet 8a of drain trap pipe 8. Flush water is spouted from jet water spout 14 toward inlet 8a of drain trap pipe 8, causing a siphon effect to occur in a relatively short time.

[0035] One end of the jet water conduit 16 is connected to a jet drain outlet 4c formed in the bottom surface 4a of the flush water tank 4, and the other end is connected to the jet spout 14. The jet water conduit 16 is equipped with a main conduit 16a that extends forward from the jet drain outlet 4c of the flush water tank 4, a first jet conduit 16b that bends to the left from the downstream end of the main conduit 16a and extends forward, a second jet conduit 16c that bends to the right from the downstream end of the main conduit 16a and extends forward, and a junction flow path 16d where the downstream ends of the first jet conduit 16b and second jet conduit 16c join and extend rearward to connect with the jet spout 14 (see Figure 1). Flush water is supplied to the jet conduit 16 from the flush water tank 4, and the head pressure of this flush water causes flush water to be spouted from the jet spout 14.

[0036] The flush water tank 4 is a gravity-fed tank that stores flush water supplied from a water supply source (not shown), such as a tap, and supplies this stored flush water to the toilet body using gravity. A rim drain outlet 4b, which drains water into the rim water conduit 12, and a jet drain outlet 4c, which drains water into the jet water conduit 16, are formed in the bottom surface 4a of the flush water tank 4. The rim drain outlet 4b is positioned forward of the jet drain outlet 4c. A rim drain valve and a jet drain valve (not shown) are provided inside the flush water tank 4 to open and close the rim drain outlet 4b and jet drain outlet 4c, respectively. Note that, in the flush toilet 1 according to the embodiment of the present invention, a form in which the flush water tank is a gravity-fed tank has been described, but the present invention is not limited to this form and other forms are possible, for example the flush water tank may be a pressurized or pressure-accumulating tank. Furthermore, in the flush toilet 1 according to the embodiment of the present invention, the rim drain outlet 4b and the jet drain outlet 4c are provided separately, but this is not limited to this embodiment, and there may also be an embodiment in which the rim drain outlet 4b and the jet drain outlet 4c are configured as a single drain outlet.

[0037] The flush water tank 4 is equipped with a water pressure drive mechanism (not shown) that is driven by the water supply pressure of flush water supplied from a water supply source, for example, and the water pressure drive mechanism is driven by the user operating a lever handle, causing the rim drain valve and jet drain valve to operate at different times. This causes the rim drain outlet 4b and the jet drain outlet 4c to open and close at different times, causing flush water to be discharged from the rim water spout 10 and the jet water spout 14 at different times. Specifically, after flushing begins, flush water is first discharged from the rim water spout 10, then, while water is still being discharged from the rim water spout 10, flush water is discharged from the jet water spout 14, and after water discharge from the jet water spout 14 stops, flush water from the rim water spout 14 returns the seal water W to its initial state.

[0038] Next, the rim water conduit 12 of the flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figure 3. Figure 3 is a cross-sectional view taken along line III-III in Figure 1.

[0039] As shown in FIG. 3, the rim water conduit 12 includes, from upstream to downstream, an inlet 12a, a water pooling section 26, a throttle section 28, a stirring section 30, a flow straightening section 32, and an outlet 12b.

[0040] First, as shown in FIG. 3, the inlet 12a of the rim water conduit 12 opens upward, and the rim drain outlet 4b of the flush water tank 4 is connected to this inlet 12a.

[0041] 3, the water accumulation section 26 of the rim water conduit 12 is formed so that the bottom surface 12c of the rim water conduit 12 is recessed downwards. In the standby state before flushing, flush water accumulates in the water accumulation section 26 up to the accumulated water level WL. As a result, flush water supplied from the rim drain outlet 4b of the flush water tank 4 to the inlet 12a of the rim water conduit 12 collides with the flush water accumulated in the water accumulation section 26, and the momentum of this flush water washes the flush water accumulated in the water accumulation section 26 downstream.

[0042] As shown in Figure 3, the throttle section 28 of the rim water conduit 12 is formed downstream of the pooling section 26. The flow path cross-sectional area of ​​the throttle section 28 (cross-sectional area perpendicular to the flow direction of the flush water) is set to be smaller than the opening cross-sectional area of ​​the rim drain outlet 4b of the flush water tank 4. This increases the flow rate of the flush water in the throttle section 28.

[0043] As shown in Figure 3, the agitation section 30 of the rim water conduit 12 is formed downstream of the constriction section 28. The agitation section 30 forms a space that suddenly expands from the constriction section 28. The flush water that flows into the agitation section 30 is agitated in the vertical direction within the agitation section 30, and then flows downstream. As a result, the flush water is agitated in the vertical direction within the agitation section 30, and is thereby temporarily retained within the agitation section 30.

[0044] As shown in Figure 3, the flow straightening section 32 of the rim water conduit 12 is formed downstream of the agitation section 30. The flow straightening section 32 is formed so that it extends at an angle downwards towards the rim water outlet 10. This allows the flow direction of flush water to be straightened in the flow straightening section 32 and flow towards the rim water outlet 10.

[0045] As shown in FIG. 3, the outlet 12b of the rim water conduit 12 is connected to the rim spout 10 and opens toward the bowl portion 6.

[0046] Next, the pooling section 26 and throttle section 28 of the rim water conduit 12 of a flush toilet 1 according to an embodiment of the present invention will be described in detail with reference to Figures 4 to 6. Figure 4 is an enlarged cross-sectional view of a portion of Figure 3, Figure 5 is a cross-sectional view taken along line VV in Figure 4, and Figure 6 is a cross-sectional view taken along line VI-VI in Figure 4.

[0047] First, as shown in Figure 4, the water accumulation section 26 of the rim conduit 12 is provided on its upstream side with a descending bottom surface 26a that gradually slopes downward downstream (forward). The descending bottom surface 26a of the water accumulation section 26 slopes downward at a substantially constant angle of inclination toward the downstream direction. The angle of inclination of the descending bottom surface 26a is set so that it slopes downward with respect to the horizontal direction. The descending bottom surface 26a is located vertically below the rim drain outlet 4b of the flush water tank 4 (the inlet 12a of the rim conduit 12). Specifically, the descending bottom surface 26a is located in the area obtained by projecting the opening cross section of the rim drain outlet 4b vertically downward.

[0048] 4, the lowest end 26b of the water accumulation section 26 is positioned forward of the center CL of the rim drain outlet 4b (inlet 12a of the rim water conduit 12) of the flush water tank 4. The lowest end 26b of the water accumulation section 26 is positioned vertically below the front end of the rim drain outlet 4b. The lowest end 26b of the water accumulation section 26 is positioned above the drain trap pipe 8, and above the lower end of the rim spout 10 (see FIG. 2).

[0049] As shown in Figure 4, the pooling section 26 of the rim conduit 12 is provided on its downstream side with a rising bottom surface 26c that gradually slopes upward towards the downstream (front) throttle section 28. The rising bottom surface 26c of the pooling section 26 slopes upward at a substantially constant angle towards the downstream. The angle of slope of the rising bottom surface 26c is set so that it slopes upward with respect to the horizontal. The rising bottom surface 26c is located forward of the front end of the rim drain outlet 4b (inlet 12a of the rim conduit 12) of the flush water tank 4. The downstream end 26d of the rising bottom surface 26c is connected to the throttle section 28, and is set so that it is the highest part of the bottom surface 12c of the rim conduit 12.

[0050] The pooled water level WL of flush water pooled in pooled water section 26 of rim conduit 12 is determined by the downstream end 26d of the raised bottom surface 26c of pooled water section 26. Pooled water section 26 is formed over approximately half the total length of rim conduit 12. Furthermore, flush water is always pooled in pooled water section 26 when in standby mode before flushing.

[0051] As shown in FIGS. 3 and 4, the upper surface 12d of the rim water conduit 12 is formed almost horizontally for the most part, with the exception of a small portion, and is formed by a nearly flat surface.

[0052] As shown in Figure 4, the flow path cross-sectional area (cross-sectional area perpendicular to the direction of flush water flow) of the rim water conduit 12 at a position vertically below the rim drain outlet 4b (near the rim drain outlet 4b) is set to be approximately the same as or larger than the opening cross-sectional area of ​​the rim drain outlet 4b of the flush water tank 4. Specifically, the flow path cross-sectional area of ​​the rim water conduit at the positions of cross section A and cross section B in Figure 4 is set to be approximately the same as or larger than the opening cross-sectional area of ​​the rim drain outlet 4b.

[0053] 5, the flow path cross section of the water retention section 26 of the rim water conduit 12 is formed in a roughly rectangular shape from the upstream side to the downstream side. The flow path cross section of the water retention section 26 is formed so that the central part 26e of the bottom surface is formed to be roughly flat. The flow path cross section of the water retention section 26 is also formed so that both left and right ends 26f of the central part 26e of the bottom surface are curved in an arc shape.

[0054] As shown in Figure 4, the throttle section 28 of the rim conduit 12 is connected to the downstream end 26d of the pool section 26. The bottom surface 28a of the throttle section 28 is formed to be smoothly continuous with the rising bottom surface 26c of the pool section 26 of the rim conduit 12. As shown in Figure 6, the flow path cross section of the throttle section 28 is formed in a flat, approximately rectangular shape. The flow path cross section of the throttle section 28 is formed so that the central part 28b of the bottom surface is approximately flat. Furthermore, the flow path cross section of the throttle section 28 is formed so that both left and right ends 28c of the central part 28b of the bottom surface are curved in an arc shape.

[0055] The flow path cross-sectional area of ​​the throttle section 28 (cross-sectional area perpendicular to the flow direction of flush water) is set to be smaller than the opening cross-sectional area of ​​the rim drain outlet 4b of the flush water tank 4. Furthermore, the flow path cross-sectional area of ​​the throttle section 28 is set to be smaller than the flow path cross-sectional area of ​​the rim water conduit 12 located in the vicinity of the rim drain outlet 4b. Specifically, the flow path cross-sectional area of ​​the throttle section 28 is set to be smaller than the flow path cross-sectional areas of cross sections A and B (cross sections perpendicular to the flow direction of flush water) shown in Figure 4, for example. Furthermore, the flow path cross-sectional area of ​​the throttle section 28 is set to be larger than the opening cross-sectional area of ​​the rim water spout 10.

[0056] Next, the operation of the flush toilet 1 according to this embodiment of the present invention will be explained with reference to FIG. FIG. 7 is a schematic diagram showing flush water flowing through the reservoir section 26 and throttle section 28 immediately after flushing of a flush toilet 1 according to an embodiment of the present invention begins.

[0057] First, in the standby state before flushing, flush water is stored in the water storage section 26 of the rim water channel 12 up to the stored water level WL (see FIG. 4). Next, when the user operates the lever handle and the rim drain valve in the flush water tank 4 opens, flush water is supplied into the rim water conduit 12 from the rim drain outlet 4b.

[0058] The flush water supplied from the rim drain outlet 4b flows forcefully vertically downward and collides with the flush water that has accumulated in the water pool 26. At this time, the flush water from the rim drain outlet 4b collides with the flush water that has accumulated in the water pool 26 so that any air that has accumulated in the rim water conduit 12 is finely broken down and flows downstream. This makes it possible to suppress abnormal noises that occur when flush water is discharged from the rim spout 10 and water splashing outside the toilet bowl.

[0059] Next, the flush water changes its flow direction by colliding with the descending bottom surface 26a of the reservoir section 26. Specifically, the flow direction of the flush water changes from downward to forward upon collision with the descending bottom surface 26a. The rim water conduit 12 is set so that the space near the rim drain outlet 4b is relatively large, making it possible to suppress pressure loss that occurs when the flow direction of the flush water is changed.

[0060] When flush water from the rim drain outlet 4b collides with the flush water collecting in the water collection section 26 with force, the flush water collecting in the water collection section 26 is swept downstream. At this time, the rim water conduit 12 is not yet full of water, and air is accumulating near the top surface 12d of the rim water conduit 12. In other words, by swept downstream of the flush water collecting in the water collection section 26, a relatively large amount of flush water can be made to flow downstream early on, before the rim water conduit 12 becomes full of water. Furthermore, the air near the top surface 12d of the rim water conduit 12 flows smoothly downstream along the top surface 12d.

[0061] Next, the flush water flows along rising bottom surface 26c while pushing against the flush water stored in water storage section 26. As rising bottom surface 26c is inclined upward toward throttle section 28 on the downstream side, the flush water stored in water storage section 26 is pushed toward throttle section 28.

[0062] The flush water's flow rate increases as it flows through the throttle section 28, where the cross-sectional area of ​​the flow path is relatively small, and after flowing into the agitator 30 and being agitated in the vertical direction, it is rectified by the rectifier 32 and discharged from the rim spout. This allows a relatively large amount of flush water to be discharged from the rim spout early on, before the rim water conduit 12 becomes full, allowing the bowl section to be thoroughly cleaned.

[0063] According to the flush toilet 1 of this embodiment, the rim water conduit 12 is provided with a throttle section 28 whose flow path cross-sectional area is smaller than the opening cross-sectional area of ​​the rim drain outlet 4b of the flush water tank 4, and a water storage section 26 in which flush water collects is provided upstream of this throttle section 28, so that flush water supplied from the rim drain outlet 4b of the flush water tank 4 pushes the flush water that has collected in the water storage section 26 downstream, and the throttle section 28 increases the flow rate so that it can be discharged from the rim spout 10. Therefore, flush water can be discharged from the rim spout 10 early on, allowing the bowl section 6 to be thoroughly cleaned. Also, because the time that flush water is discharged from the rim spout 10 can be made relatively long, the user is given the impression that the bowl section 6 has been thoroughly cleaned.

[0064] Furthermore, according to the flush toilet 1 of this embodiment, the water pooling section 26 has a rising bottom surface 26c on its downstream side that slopes upward toward the throttle section 28, so that the flush water pooled in the water pooling section 26 can be smoothly swept away toward the throttle section 28.

[0065] According to the flush toilet 1 of this embodiment, the lowest end 26b of the water storage section 26 is positioned forward of the center of the drain outlet 4b of the flush water tank 4, so that flush water stored in the water storage section 26 can be pushed forward.

[0066] Furthermore, according to the flush toilet 1 of this embodiment, the water storage section 26 is positioned vertically below the drain outlet 4b of the flush water tank 4, so that the flush water supplied from the drain outlet 4b of the flush water tank 4 collides with the flush water stored in the water storage section 26, and the flush water stored in the water storage section 26 can be pushed downstream.

[0067] According to the flush toilet 1 of this embodiment, the water storage section 26 has a descending bottom surface 26a on its upstream side that slopes downward toward the downstream side, and this descending bottom surface 26a is positioned vertically below the drain outlet 4b of the flush water tank 4, so that when the flush water collides with the descending bottom surface 26a, the flow direction is changed and the flush water stored in the water storage section 26 can be swept downstream.

[0068] Furthermore, according to the flush toilet 1 of this embodiment, the lowest end 26b of the water storage section 26 is positioned above the drain trap pipe 8, so that the amount of flush water stored in the water storage section 26 can be sufficient to be washed away by the flush water supplied from the drain outlet 4b of the flush water tank 4, without making the water storage section 26 too deep.

[0069] With the flush toilet 1 of this embodiment, the upper surface of the rim water conduit is formed almost horizontally, allowing air that has accumulated near the upper surface of the rim water conduit to flow smoothly downstream.

[0070] According to the flush toilet 1 of this embodiment, flush water can be discharged from the rim spout 10 early on, as it is positioned further forward than the rim drain outlet 4b and jet drain outlet 4c.

[0071] Furthermore, with the flush toilet 1 of this embodiment, the rim water conduit 12 is formed from a separate water conduit from the jet water conduit 16, so flush water can be discharged from the rim spout 10 at an early stage. Also, compared to when the rim water conduit 12 and jet water conduit 16 are configured from a single water conduit, the rim water conduit 12 fills up relatively quickly, so the head pressure from the flush water stored in the flush water tank can be applied to the flush water in the rim water conduit 12 at an early stage. This makes it possible to prevent head pressure from being wasted until the water conduit is filled with water.

[0072] In a flush toilet 1 according to an embodiment of the present invention, an agitation section 30 and a rectification section 32 are provided downstream of the throttling section 28, but as a variation of this embodiment, the agitation section 30 and the rectification section 32 may be omitted, and the downstream end of the throttling section 28 may be directly connected to the rim spout 10.

[0073] In a flush toilet in this modified version of the present embodiment, the downstream end of the throttle section 28 is directly connected to the rim spout 10, so flush water can be discharged from the rim spout 10 early on.

[0074] Although the embodiment of the present invention has been described above, various modifications can be made to the above-described embodiment. [Explanation of symbols]

[0075] 1: Flush toilet 4: Cleaning water tank 4a: Bottom of the cleaning water tank 4b: Rim drain hole 4c: Jet outlet 6: Bowl section 8: Drain trap pipe 10: Rim spout 12: Rim waterway 12a: Entrance to the rim channel 12b: Outlet of the rim channel 12c: Bottom of the rim channel 12d: Top surface of the rim channel 14: Jet water outlet 16: Jet waterway 16a: Leading waterway 16b: First jet waterway 16c: Second jet waterway 16d: Confluence channel 18: Waste receiving surface 20: Rim 26: Reservoir 26a: Descending bottom of the water reservoir 26b: The lowest point of the water reservoir 26c: Rising bottom of the water reservoir 26d: Downstream end of the reservoir 28: Constriction section 28a: Bottom surface of the constriction 30: Stirring section 32: Rectifier CL: Center of rim drain hole WL: Reservoir water level

Claims

1. A flush toilet that is flushed with flush water to discharge waste, a toilet body including a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface, and a drain trap pipe line provided below the bowl portion for discharging waste; a flush water tank that stores flush water for flushing the toilet body and has a drain outlet formed therein for discharging the stored flush water into the toilet body; a rim spout provided in the rim portion for spouting flush water toward the bowl portion; a rim water conduit connecting the flush water tank drain outlet and the rim spout; and A flush toilet characterized in that the rim water conduit is provided with a throttle section having a flow path cross-sectional area smaller than the opening cross-sectional area of ​​the drain outlet of the flush water tank, and a water storage section in which flush water collects is provided upstream of this throttle section.

2. 2. The flush toilet according to claim 1, wherein the water pooling section has a rising bottom surface on its downstream side that slopes upward toward the throttle section.

3. 3. A flush toilet according to claim 2, wherein the lowest end of the water reservoir is located forward of the center of the drain outlet of the flush water tank.

4. 4. The flush toilet according to claim 3, wherein the water reservoir is disposed vertically below the drain outlet of the flush water tank.

5. 5. A flush toilet according to claim 4, wherein the water storage section has a descending bottom surface on its upstream side that slopes downward toward the downstream side, and this descending bottom surface is positioned vertically below the drain outlet of the flush water tank.

6. 6. The flush toilet according to claim 5, wherein the lowest end of the water reservoir is located above the drain trap pipe.

7. 7. A flush toilet according to any one of claims 1 to 6, wherein the upper surface of the rim water channel is formed substantially horizontally.

8. The flush water tank further includes a jet water outlet that is provided below the bowl portion and that spouts flush water toward the inlet of the drain trap pipe, and a jet water conduit that connects the jet drain outlet of the flush water tank and the jet water outlet, the flush water tank's drain outlet comprises a rim drain outlet connected to the rim water conduit and a jet drain outlet connected to the jet water conduit, The flush toilet according to claim 1, wherein the rim drain outlet is positioned forward of the jet drain outlet.

9. The flush toilet according to claim 1, wherein the downstream end of the throttle portion is directly connected to the rim spout.

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