JP2012237126A - Flush toilet bowl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flush toilet bowl that allows a toilet bowl to be successfully washed even with a small quantity of washing water.SOLUTION: A flush toilet bowl 1 of the present invention includes a water storage tank 2 storing washing water; a bowl part 8 including a dirt receiving surface 14 and a rim part 16; a drainage channel 12 through which water is drained by siphonage; a rim water discharge port 20 disposed at a position of the rim part corresponding to a side of the bowl part; a jet water discharge port 22 for discharging washing water toward an inlet of the drainage channel 12; a rim water channel 24 through which the washing water is guided to the rim water discharge port; a jet water channel 26 through which the washing water is guided to the jet water discharge port; and a flow dividing chamber 10 for dividing the washing water into the rim water channel and the jet water channel. A water tank is provided in a toilet bowl body such that its bottom surface is disposed at a prescribed distance H1 upward from a top surface of the toilet bowl body.

Description

  The present invention relates to a flush toilet, and more particularly, to a flush toilet that forms a swirling flow of wash water and discharges filth by siphon action.

  Conventionally, for example, as described in Patent Document 1, a water storage tank and a toilet body provided with a rim spout formed on the side of the bowl portion and a jet spout facing the trap drain are provided. A flush toilet is known in which flush water drained from a water storage tank is diverted in a common water passage and the wash water is supplied to both the rim water spouting port and the jet water spouting port.

  In the flush toilet described in this Patent Document 1, the wash water discharged from the water storage tank is connected to the rim water passage through the common water passage to the rim water outlet, and similarly to the jet water outlet through the common water passage. There is a Zet waterway that leads.

JP 2005-113634 A

  However, in the conventional flush toilet described in Patent Document 1 described above, the wash water discharged from the water storage tank passes through the common water passage, passes from the rim water passage to the rim spout, and simultaneously from the jet water passage. Since the water is supplied to the water outlet, the momentum of the cleaning water discharged from the rim water outlet and the jet outlet is weaker than that of the toilet of other structure, and there is a problem that the cleaning performance is deteriorated.

  In particular, in the case of a recently requested water-saving flush toilet (for example, a toilet with a wash water amount of 4.2 liters or less), the water level of the wash water becomes low and sufficient head pressure does not act. However, the problem that the cleaning performance is remarkably lowered has become more apparent.

  Then, this invention is made | formed in order to solve the problem mentioned above, and it aims at providing the flush toilet which can perform toilet bowl washing | cleaning satisfactorily even with a small amount of washing water.

In order to achieve the above object, the present invention provides a flush toilet for washing a toilet bowl body with wash water, storing a wash water to be supplied to the toilet bowl body, and having a drain tank for discharging the wash water; A bowl-shaped filth receiving surface and a rim portion at the upper edge, a drainage channel connected to the lower part of the bowl for discharging the filth by siphoning, and a side of the bowl A rim spout unit is provided at a corresponding rim portion, and the cleaning water swirls along the rim portion to discharge the cleaning water so as to clean the bowl portion, and the cleaning water is discharged toward the entrance of the drainage channel. Zet water discharge unit, rim water channel leading the cleaning water to the rim water discharge unit, Zet water channel leading the cleaning water to the jet water discharge unit, cleaning water flowing from the drain of the water storage tank and washing water to the rim water channel A diversion chamber that diverts to the Zet waterway Has a water storage tank is characterized in that its bottom is provided in the stool body spaced upward by a predetermined distance from the upper surface of the toilet bowl.
In the present invention configured as described above, since the bottom surface of the water storage tank is provided on the toilet body with a predetermined distance upward from the top surface of the toilet body, the amount of washing water in the water storage tank is reduced by water saving. However, sufficient head pressure is given to the washing water, and the washing water can be supplied to the toilet body. As a result, according to the present invention, the cleaning performance can be ensured even when the amount of cleaning water is reduced due to water saving.

The present invention preferably further includes a washing water retention portion that temporarily retains the washing water provided between the drain port of the water storage tank and the diversion chamber.
According to the present invention configured as described above, since the cleaning water retention portion for temporarily retaining the cleaning water is provided between the drain port of the water storage tank and the diversion chamber, the cleaning water is retained. A head pressure is applied to the cleaning water, and the cleaning water is vigorously supplied from the branch chamber to the rim water discharge unit and the jet water discharge unit via the rim water supply channel and the jet water supply channel. As a result, according to the present invention, the cleaning performance can be ensured even when the amount of cleaning water is reduced due to water saving.

In the present invention, preferably, the washing water retention portion is a cylindrical member disposed between the drain of the water storage tank and the upper surface of the toilet body, and the area of the inlet of the zet conduit is the cross-sectional area of the cylindrical member. Is smaller than
In the present invention configured as described above, the area of the inlet of the Zet conduit is smaller than the cross-sectional area of the cylindrical member disposed between the drain of the water storage tank and the upper surface of the toilet body. The inlet of the jet conduit becomes a resistance against the washing water flowing from the cylindrical member through the branch chamber into the jet conduit. For this reason, it becomes easy for the cleaning water to stay temporarily in the cylindrical member, and the head pressure is applied to the stored cleaning water, so that the cleaning water is vigorously passed from the branch chamber through the rim conduit and the zette conduit. It can supply to a rim water discharging part and a jet water discharging part. As a result, according to the present invention, the cleaning performance can be ensured even when the amount of cleaning water is reduced due to water saving.

In the present invention, preferably, the drain of the water storage tank is provided almost directly above the inlet of the jet conduit.
In the present invention configured as described above, since the drainage port of the water storage tank is provided almost directly above the inlet of the jet conduit, the washing water can be vigorously passed through the jet conduit from the branch chamber. It can supply to a water discharge part. Thereby, a stronger siphon action can be generated and the cleaning performance can be improved. Furthermore, the air remaining in the jet conduit can be effectively discharged to the water storage tank side.

In the present invention, preferably, the jet conduit is formed so that the washing water retained in the washing water retention portion flows into the jet conduit more than the rim conduit in the latter half of the toilet cleaning. Yes.
In the present invention configured as described above, the washing water staying in the washing water staying portion is stronger and more because more washing water flows into the zette waterway than the rim waterway in the latter half of the toilet flushing. The siphon action can be generated for a long time, and the cleaning performance can be improved.

In the present invention, preferably, the upstream portion of the jet conduit is formed to be inclined 55 to 65 degrees downward with respect to the horizontal line.
In the present invention configured as described above, the air remaining in the jet conduit can be effectively discharged to the water storage tank side.

  In the present invention, the toilet body is preferably washed with a washing water amount of 3.6 to 4.2 liters.

  According to the flush toilet of the present invention, toilet flushing can be performed satisfactorily even with a small amount of washing water.

It is a top view which shows the flush toilet bowl by embodiment of this invention. It is side surface sectional drawing seen along the II-II line | wire of FIG. It is an expanded side sectional view showing a drainage valve used for a flush toilet according to an embodiment of the present invention. It is front sectional drawing seen along the IV-IV line of FIG. FIG. 5 is a rear sectional view taken along line VV in FIG. 2. It is a diagram which shows the instantaneous flow volume of the wash water discharged from the rim water spouting port and the jet water spouting port in the flush toilet according to the embodiment of the present invention.

Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the drawings.
First, the basic structure of the flush toilet according to the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view showing a flush toilet according to an embodiment of the present invention, and FIG. 2 is a side sectional view taken along line II-II in FIG.

  As shown in FIGS. 1 and 2, a flush toilet 1 according to this embodiment is a tank-type water-saving flush toilet, a water storage tank 2 for storing wash water, and a toilet body to which wash water is supplied. The water storage tank 2 is attached to the toilet body 4.

  The toilet body 4 is made of earthenware with a glaze layer formed on the surface, a skirt portion 6 is formed at the lower portion, a bowl portion 8 is formed at the front of the upper half, a flow dividing chamber 10 at the upper rear portion, and a lower rear portion. A drainage channel 12 is formed in each.

  The bowl portion 8 has a bowl-shaped waste receiving surface 14 and a rim portion 16 constituting an upper edge portion, and a shelf portion 18 is provided on the entire circumference along the upper edge of the bowl portion 16 on the lower side of the rim portion 16. Is formed. Further, the inner side surface 16a of the rim portion 16 extends substantially vertically so as not to become a blind spot when viewed from above. As a result, the inner surface 16a can be easily wiped using a disposable paper or the like during cleaning, and the washing water does not jump out.

  An entrance 12a of the drainage channel 12 opens at a center of the filth receiving surface 14 and below the water storage surface (sealing surface) W, and an ascending channel 12b extends backward from the drainage channel entrance 12a. The descending path 12c (vertical pipe) is continuous, and the lower end of the descending path 12c is connected to the discharge pipe via a drain socket (not shown).

When the toilet body 4 is viewed from the front, a rim spout 20 is formed on the left side of the shelf 18 of the rim 16, and below the bowl 8, facing the inlet 12 a of the drainage channel 12. A jet spout 22 is formed. Here, one rim spout 20 is preferable. Wash water is spouted from the rim spout 20 onto the shelf 18 and the wash water flows toward the bowl 8 while turning on the shelf 18, thereby washing the bowl 8. It has become.
Further, the cleaning water is discharged from the jet water discharge port 22 toward the inlet 12a of the drainage channel 12, thereby causing a siphon action. Further, the refill (sealed water) is performed by the washing water discharged from the jet outlet 22.

  Further, in the toilet body 1, a rim conduit 24 for supplying cleaning water to the rim spouts 20 and a jet conduit 26 for supplying cleaning water to the zets spouts 22 are formed. The detailed structure of the rim water conduit 24 and the zette water conduit 26 will be described later.

  The above-described diversion chamber 10 has a wash water inlet 10a formed above it, and the wash water in the water storage tank 2 flows into the diversion chamber 10 from the wash water inlet 10a. Further, the diversion chamber 10 is connected to the rim water conduit 24 and the jet water conduit 26, and is configured to divert cleaning water supplied to the rim water outlet 20 and the jet water outlet 22.

Next, the structure of the water storage tank will be described with reference to FIG. FIG. 3 is an enlarged side cross-sectional view showing a drain valve used in a flush toilet according to an embodiment of the present invention.
As shown in FIG. 3, the water storage tank 2 includes an external tank 2a, an internal tank 28 disposed in the external tank 2a, and a drain valve 30 attached in the internal tank 28. On the downstream side of the drain valve 30, a cylindrical member 32 is provided for obtaining a necessary head pressure and for retaining cleaning water. The cylindrical member 32 functions as a washing water retention part, and a detailed structure thereof will be described later. The cylindrical member 32 may be formed integrally with the external tank 2a or may be formed as a separate member.

  A drain port 34 is formed on the bottom surface of the internal tank 28, and a valve seat 36 is formed on the upper edge of the drain port 34. A control cylinder 38 is fixedly disposed on the bottom surface of the internal tank 28 above the drain port 34. An overflow pipe 40 is inserted into the inner space of the control cylinder 38, and a disc-shaped valve body 42 is attached to the lower end of the overflow pipe 40. The float 44 is attached, and the float 44 is arranged so as to float in the water storage chamber 38 a in the control cylinder 38. Thus, the overflow pipe 40, the valve body 42, and the float 44 are integrated, and can be moved in the vertical direction. A control small hole (not shown) is formed in the bottom surface of the water storage chamber 38a of the control cylinder 38, and the cleaning water in the water storage chamber 38a flows out from the control small hole.

  The operation of the drain valve 32 will be described. When an operation lever (not shown) is operated, the overflow pipe 40 is lifted together with the valve body 42 and the float 44 by the drive mechanism. As a result, the valve body 42 is separated from the valve seat 36 and cleaning water is discharged from the drain port 34. leak. At this time, since the washing water in the water storage chamber 38a gradually flows out from the control small hole, the water level in the water storage chamber 38 also gradually falls. As the water surface descends, the float 44 also gradually descends, so that the valve body 42 does not suddenly descend and the drain port 34 is not closed.

Next, with reference to FIGS. 1, 2, 4, and 5, the cylindrical member 32, the rim conduit 24, the jet conduit 26, and the like will be described in detail. 4 is a front sectional view taken along line IV-IV in FIG. 2, and FIG. 5 is a rear sectional view seen along line V-V in FIG.
First, as shown in FIG. 2, the tubular member 32 has a predetermined height H1 and a diameter D1, and the toilet body of the internal tank 28 that stores wash water by the height H1 of the tubular member 32. The height from the top surface of 4 itself is increased, thereby increasing the head pressure of the washing water. Further, although details will be described later, the cleaning water stays in the cylindrical member 32. At this time, the head pressure also acts on the remaining cleaning water.
In addition, the washing water inlet 10a of the branch chamber 10 described above is also the same size as the diameter D1 of the cylindrical member 32.

  Next, as shown in FIG. 1, the drain port 34 of the water storage tank 2 is formed so as to be biased to the left side when viewed from the front in a plan view. As shown in FIGS. 1 and 2, the cylindrical member 32 is also attached directly below the drain outlet 34, and the shunt chamber 10 in the toilet body 1 described above is also formed directly below the cylindrical member 32. Yes.

  Next, as shown in FIGS. 1 and 2, the rim conduit 24 is connected to the branch chamber 10 on the upstream side and connected to the rim spout 20 on the downstream side. The rim water conduit 24 is formed to have a substantially linear shape. Thereby, the diversion chamber 10, the rim conduit 24, and the rim water discharge port 20 are formed along substantially the same straight line extending in the horizontal direction, as is apparent from FIGS. Thus, the rim water guide path 24 is formed so as not to have a substantial bent portion.

  The inlet 26a of the jet conduit 26 is connected to the branch chamber 10 and the downstream side thereof is connected to the jet outlet 22. The inlet 26a of the jet conduit 26 has a square shape with a side length L1 (see FIG. 1), and the area of the inlet 26a of the jet conduit 26 is smaller than the cross-sectional area of the cylindrical member 32 described above. ing. Further, the inlet 26 a of the jet conduit 26 is formed immediately below the drain port 34, the cylindrical member 32, and the diversion chamber 10 of the water storage tank 2 described above.

As shown in FIG. 2, the upstream portion of the jet conduit 26 is formed to be inclined 60 degrees downward with respect to the horizontal direction. It is preferable that the inclination angle of the upstream portion of the jet conduit 26 is inclined in the range of 55 to 65 degrees downward with respect to the horizontal direction.
Further, as shown in FIG. 1, the zette water conduit 26 is formed so as to be substantially collinear with the rim water conduit 24 and the diversion chamber 10 in a plan view.

Here, the amount of washing water used by the flush toilet 1 will be described. First, the above-described water storage tank 2 stores cleaning water supplied by an external water supply pipe (not shown) before the start of cleaning, and the amount of cleaning water stored is 2.5 liters. The amount of washing water stored in the water storage tank 2 is preferably in the range of 2.3 to 2.9 liters.
Further, after the siphon action is finished, the wash water supplied from the external water supply pipe is refilled into the toilet body 4 via the water storage tank 2, and the refill amount of this wash water is 1.3 liters.
Thus, the washing water amount (total water discharge amount) necessary for washing the toilet body of the flush toilet according to the present embodiment is 3.8 liters (or 3.6 liters to 4.4 liters) including this refill amount. 2 liters is preferred).
In the flush toilet according to the present embodiment, the water storage tank may store the cleaning water amount (total water discharge amount) including the refill amount. In this case, the amount of washing water of 3.8 liters (or preferably 3.6 liters to 4.2 liters) is stored in the water storage tank.

Next, the operation of the flush toilet according to this embodiment described above will be described. First, with reference to FIG. 6, the relationship between the instantaneous flow rate and time in the water discharged from the rim water outlet and the jet outlet will be described.
As shown in FIG. 6, in this embodiment, 2.5 liters of washing water is stored in the water storage tank 2, and it is necessary for washing the bowl portion 8 out of the 2.5 liters of washing water. The amount of cleaning water discharged from the rim spout 20 is 0.7 liter, and the amount of cleaning water required to generate the siphon action is 1.8 liter. Further, as described above, after the siphon operation is finished, the amount of cleaning water 1.3 liters necessary for refilling is discharged from the water jet pipe 22 (not shown) through the water storage tank 2 and discharged from the jet outlet 22. Is done.

  Specifically, first, when the user operates the operation lever of the water storage tank 2, the valve body 42 of the drain valve 30 rises together with the overflow pipe 40 and the float 44, the valve body 42 moves away from the valve seat 36, and the drain valve 34 is open. Thereafter, the wash water falls in the cylindrical member 32 and flows into the diversion chamber 10. In the diversion chamber 10, the wash water is diverted into the rim water conduit 24 and the zette water conduit 26, and passes through the rim water conduit 24 to the rim. Water is discharged from the water discharge port 20, and is further discharged from the jet water discharge port 22 through the Zet water conduit 26.

At this time, as shown in FIG. 6, the water discharge start timings at the rim water discharge port and the jet water discharge port are substantially the same.
Moreover, in this embodiment, the water discharge from the rim water spouting port 20 is ended at the end of the siphon action or before the end.

Hereinafter, the operation of the flush toilet according to the present embodiment will be described more specifically.
When the drain valve 34 is opened, the wash water stored in the internal tank 28 is discharged from the drain port 34, falls inside the cylindrical member 32, and flows into the branch chamber 10 of the toilet main body 4 directly below. At this time, since the bottom surface of the water storage tank 2 (internal tank 28) is provided away from the upper surface of the toilet body 4 by a distance corresponding to the height H1 of the tubular member 32, the water storage tank 2 is washed. Even if the amount of water decreases due to water saving, a sufficient head pressure is applied to the wash water, and the wash water can be supplied to the toilet body 4. Thereby, according to the flush toilet 1 by this embodiment, even if the amount of washing water reduces by water-saving, washing performance is securable.

  Next, when the wash water in the water storage tank 2 flows into the branch chamber 10 of the toilet body 4, the cylindrical member 32 is provided, and the drain port 34 and the outlet 26 a are just above the inlet 26 a of the jet conduit 26. Since the cylindrical member 32 is provided and the area of the inlet 26a of the jet conduit 26 is smaller than the cross-sectional area of the cylindrical member 32, when the cleaning water flows into the flow dividing chamber 10, the cylindrical member Wash water temporarily stays in H.323.

  As described above, the cleaning water temporarily stays in the cylindrical member 32 provided between the drain port of the water storage tank 2 and the diversion chamber 10, and the cylindrical member 32 functions as a cleaning water retention portion. The cleaning water stays to give head pressure to the cleaning water, and the cleaning water is vigorously supplied from the branch chamber 10 to the rim water outlet 20 and the jet water outlet 22 via the rim water conduit 24 and the jet water conduit 26. Is done. Thereby, according to the flush toilet 1 by this embodiment, even if the amount of washing water reduces by water-saving, washing performance is securable.

  In addition, since the area of the inlet 26a of the jet conduit 26 is smaller than the cross-sectional area of the cylindrical member 32, the cleaning water flowing into the jet conduit 26 from the cylindrical member 32 through the branch chamber 10 is prevented. Since the inlet 26a of the jet conduit 26 becomes a resistance, the cleaning water tends to stay temporarily in the cylindrical member 32, and the head pressure is applied to the stored cleaning water. It can be supplied from the chamber 10 to the rim water outlet 20 and the jet water outlet 22 via the rim water conduit 24 and the jet water conduit 26.

  Furthermore, since the drain port 34 of the water storage tank 2 is provided immediately above the inlet 26a of the Zet conduit 26, the wash water is vigorously transferred from the branch chamber 10 to the Zet outlet 22 via the Zett conduit 26. Can be supplied. Thereby, a stronger siphon action can be generated and the cleaning performance can be improved. Furthermore, since the air remaining in the jet conduit 26 can be effectively discharged to the cylindrical member 32 on the water storage tank side, the cleaning performance can be further improved.

  In addition, since the inlet 26a of the jet conduit 26 is opened directly below the cylindrical member 32, the cleaning water staying in the cylindrical member 32 is guided from the rim conduit 24 in the latter half of the toilet bowl cleaning. A large amount of washing water flows into the water channel 26. As a result, in the second half of toilet cleaning, in which the siphon action is weakened, the head pressure can be applied to the wash water discharged from the jet conduit 26 to generate a stronger and longer siphon action, thereby improving the washing performance. Can do.

  Further, as described above, the upstream portion of the jet conduit 26 is formed to be inclined 55 to 65 degrees, preferably 60 degrees downward with respect to the horizon, so that it remains in the jet conduit 26. Since the air that is present can be effectively discharged into the cylindrical member 32 on the water storage tank side, the cleaning performance can be further improved.

  Next, in the flush toilet according to the present embodiment, the branch chamber 10, the rim water conduit 24, and the rim spout 20 are formed along substantially the same straight line extending in the horizontal direction. Can be shortened, and the bent portion of the rim conduit 24 can be reduced, so that the pressure loss generated in the rim conduit 24 can be reduced. Thereby, the rim water discharge start timing from the rim water discharge port 20 can be advanced (see FIG. 6), and further, before or after the end of the siphon action in the drainage channel 12 generated by water discharge from the jet water discharge port 22. Since the bowl part washing can be completed, the toilet bowl can be satisfactorily washed even with a small amount of washing water.

  Further, since the zette water conduit 26 is formed on the substantially same straight line as the plan view with the rim water conduit 24 and the diversion chamber 10 (see FIG. 1), the water discharged from the rim water discharge port 20 and the water discharge from the jet water discharge port 22. Since the water discharge start timing of the water discharge can be made almost simultaneously (see FIG. 6), the cleaning of the bowl portion 8 can be completed simultaneously with or before the end of the siphon action. As a result, no filth remains in the bowl portion 8, and the toilet bowl can be satisfactorily washed even with a small amount of washing water.

  Further, when the number of rim spouts 20 is one, compared to the case where there are two or more rim spouts, the discharge start timing of the wash water from the rim spout 20 can be made earlier, and siphon action can be achieved. The cleaning of the bowl portion can be completed simultaneously with or before the end. Thereby, toilet cleaning can be performed satisfactorily with a small amount of washing water.

  Furthermore, since the rim water spouting port 20 is provided on the shelf 18 disposed on the lower side of the rim portion, even if the momentum of the washing water discharged from the rim water spouting port 20 increases, Jumping outside beyond 16 can be prevented.

  The flush toilet according to the present embodiment can be applied to a water-saving flush toilet. Preferably, the flush water amount of the toilet body is 3.6 to 4.2 liters.

  The present invention can be applied to a flush toilet of the type that discharges wash water only from the rim spout, in addition to the embodiment described above. In this case, the basic structure of the flush toilet is the same as the flush toilet according to the above-described embodiment. As a different structure, the toilet body does not have a diversion chamber, a jet conduit, and a jet outlet, and the wash water in the water storage tank passes from the drain through the tubular member to the upstream end of the rim conduit. Direct inflow. The rim water channel is substantially the same as the rim water channel 24 in the above-described embodiment, and the rim water channel and the rim water outlet are formed along substantially the same straight line.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Reservoir tank 4 Toilet body 8 Skirt part 10 Diverging chamber 12 Drainage channel 14 Soil receiving surface 16 Rim part 18 Shelf part 20 Rim water outlet 22 Zet water outlet 24 Rim water channel 26 Zet water channel 26a Zet water channel 26 Inlet 28 Internal tank 30 Drain valve 32 Tubular member (wash water retention part)
34 Drainage port

Claims (7)

In flush toilets that wash the toilet bowl body with wash water,
A water storage tank having a drainage port for storing cleaning water supplied to the toilet body and discharging the cleaning water;
A bowl portion with a bowl-shaped filth receiving surface and a rim portion at the upper edge;
A drainage channel where the inlet is connected to the lower part of the bowl part and discharges filth by siphon action,
A rim water spouting part that is provided at a position of the rim part corresponding to the side of the bowl part, and that spouts the washing water so that the washing water swirls along the rim part to wash the bowl part;
A jet water discharger for discharging cleaning water toward the inlet of the drainage channel;
A rim water conduit that guides cleaning water to the rim water spouting section;
A Zet water conduit that guides wash water to the Zet water discharge part,
A wash chamber into which the wash water flows from the drain port of the water storage tank and diverts the wash water into the rim water conduit and the zette water conduit;
The flush toilet characterized in that the water storage tank is provided in the toilet body with a bottom surface spaced apart from the upper surface of the toilet body by a predetermined distance.   The flush toilet according to claim 1, further comprising a washing water retention portion for temporarily retaining washing water provided between a drain outlet of the water storage tank and the diversion chamber.   The washing water retention portion is a cylindrical member disposed between the drain of the water storage tank and the upper surface of the toilet body, and the area of the inlet of the zette water conduit is more than the cross-sectional area of the cylindrical member The flush toilet according to claim 2, which is small.   The flush toilet according to claim 2 or 3, wherein the drainage port of the water storage tank is provided almost directly above the inlet of the Zet conduit.   The Zet water channel is formed so that a large amount of washing water flows into the Zet water channel from the rim water channel in the latter half of toilet cleaning, in the wash water retained in the cleaning water retention unit. 4. A flush toilet according to 4.   The flush toilet according to any one of claims 1 to 5, wherein an upstream portion of the zette waterway is formed to be inclined downward by 55 to 65 degrees with respect to a horizontal line.   The flush toilet according to any one of claims 1 to 6, wherein the toilet body is washed with a washing water amount of 3.6 to 4.2 liters.

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