CN107709676B

CN107709676B - Water closet

Info

Publication number: CN107709676B
Application number: CN201680036606.8A
Authority: CN
Inventors: 近藤康宏; 伊藤谦一; 松原光; 稻毛幸满
Original assignee: Lixil Corp
Current assignee: Lishu Group Co ltd; Lixil Corp
Priority date: 2015-07-08
Filing date: 2016-07-04
Publication date: 2020-02-21
Anticipated expiration: 2036-07-04
Also published as: EP3321438A4; WO2017006903A1; CN107709676A; EP3321438B1; EP3321438A1

Abstract

A toilet bowl is provided with a toilet bowl main body (12), and the toilet bowl main body (12) comprises: a toilet seat (14); and a water jet unit (36) for jetting flush water into the toilet seat (14), the toilet seat (14) having: a receiving face portion (26) for receiving dirt; and a rim section (28) connected to the upper end edge (26a) of the receiving surface section (26), wherein the water jet section (36) has three water jet ports (32A-32C) formed in the rim section (28), and jets flush water from the three water jet ports (32A-32C) to one side in the circumferential direction along the inner peripheral surface of the rim section (28), the toilet seat section (14) has four divided regions (Sr 1-Sr 4) divided by a left-right center line bisecting the left-right dimension of the outer surface section of the toilet body (12) and a front-rear center line bisecting the front-rear dimension of the inner surface section of the toilet seat section (14) in a plan view, and the three water jet ports (32A-32C) are formed independently in three divided regions of the four divided regions (Sr 1-Sr 4).

Description

Water closet

Technical Field

The present invention relates to toilets.

Background

1. Conventionally, various flushing methods for flushing the inside of a toilet seat of a toilet have been studied. Patent document 1 proposes a toilet flushing device in which three water jet ports are provided behind a toilet seat, and a discharge pattern of flush water discharged from the three water jet ports can be changed by a switching valve. This document discloses a spray pattern using only one of three water jets and a pattern using two water jets as a spray pattern of flush water.

Documents of the prior art

Patent document

Patent document 1: japanese laid-open patent publication No. 2006-9382

Patent document 2: japanese patent No. 5553188

Patent document 3: japanese laid-open patent publication No. 2015-67954

Disclosure of Invention

Problems to be solved by the invention

However, the toilet seat generally has: a receiving face portion for receiving dirt; an edge portion connected to an upper edge portion of the receiving face portion. As a flushing method of the toilet seat, the following methods are known: the inside of the toilet seat is flushed by spraying flush water from a water spray port formed in the rim portion to one side in the circumferential direction along the inner circumferential surface of the rim portion. This flushing method has an advantage that a good cleaning performance can be obtained because a wide range of the toilet seat including the inner peripheral surface of the rim portion is flushed with the flush water, as compared with a method of flushing the inside of the toilet seat by jetting the flush water downward from the water jet ports of the rim portion.

The present inventors have studied such a flushing method and have found the following problems. In this flushing system, while the flush water flows along the inner peripheral surface of the rim, the flush water flows downward due to gravity. Therefore, in order to obtain a good rim washing ability, it is necessary to make the washing water reach the entire inner peripheral surface of the rim. When a study is made from such a viewpoint, it is found that the toilet flushing device of patent document 1 does not perform a special method for flushing the inner peripheral surface of the rim portion, and there is room for improvement in rim flushing capability.

The first invention has been made in view of the above problems, and an object thereof is to provide a toilet bowl capable of obtaining a good rim flushing capability.

2. Conventionally, various flushing methods for flushing the inside of a toilet seat of a toilet have been studied. Patent document 1 discloses a toilet bowl including a recessed portion formed below a bowl-shaped waste receiving surface, an edge portion, and two water jet portions, and a main stream of flush water jetted from the two water jet portions flows into the recessed portion. On the other hand, for such a toilet bowl, it is required to be able to perform flushing with a smaller amount of water for efficient use of water resources.

However, fig. 11 of patent document 2 shows an inflow path of washing water from both rim water spray parts. In this toilet bowl, the main flow from these rim water spray portions flows in the front and right sides of the bowl in the recessed portion in a plan view. Therefore, it is considered that the flushing force against the filth attached to the depth side or the left side in the front view depressed portion of the toilet is insufficient. Further, although the flow mainly downward in the direction of the drain (trap) inlet is mainly formed by the main flow, it is difficult to form the downward flow in the left deep region of the main-view recessed portion of the toilet bowl, and floating dirt is accumulated. In particular, when the water is flushed with a small amount of water, there is a fear that the unbalanced imbalance of the water flow and the downward flow in the recess is significantly affected.

That is, in such a toilet bowl, it is necessary to suppress imbalance of water flow and downward flow in the recess to improve the flushing force. When studying from such a viewpoint, the toilet bowl of patent document 2 does not particularly seek to improve the imbalance between the water flow in the recess and the downward flow, and there is room for improvement in the flushing capability of the recess of the toilet bowl.

The second invention has been made in view of the above problem, and an object thereof is to provide a toilet bowl capable of suppressing imbalance between water flow in the concave portion and downward flow and obtaining a good flushing capability of the concave portion.

Means for solving the problems

A toilet bowl according to a first aspect of the first invention for solving the above problems. The toilet bowl includes a toilet bowl main body including: a toilet seat; and a water jet part for jetting washing water into the toilet seat, the toilet seat having: a receiving face portion for receiving dirt; and a rim portion connected to an upper edge portion of the receiving surface portion, the water discharge portion having three water discharge ports formed in the rim portion, discharging flush water from the three water discharge ports to one side in a circumferential direction along an inner peripheral surface of the rim portion, the toilet seat having four divided regions divided by a left-right center line bisecting a left-right dimension of an outer surface portion of the toilet main body and a front-rear center line bisecting a front-rear dimension of an inner surface portion of the toilet seat in a plan view, the three water discharge ports being independently formed in three of the four divided regions.

According to this aspect, independent water discharge ports are formed in three of the four divided regions, respectively. Therefore, as compared with the case where independent water discharge ports are formed in two of the four divided regions, the inner circumferential length of the edge portion from each water discharge port to the other water discharge port adjacent to the one side in the circumferential direction can be shortened. Therefore, the flush water can easily reach the entire inner peripheral surface of the rim portion, and a good rim flushing ability can be obtained.

A first aspect of a second invention for solving the above problems is a toilet bowl. The toilet bowl includes a toilet bowl main body having a toilet bowl seat. The toilet seat includes: a receiving face portion for receiving dirt; an edge portion connected to an upper edge portion of the receiving face portion; and a recess portion formed by being recessed downward from a lower edge portion of the receiving surface portion. The recessed portion is defined by three vertical walls including a left vertical wall, a right vertical wall, and a rear vertical wall, the left vertical wall and the right vertical wall corresponding to left and right sides of a triangle having a bottom located rearward of the left and right sides in a plan view, respectively, the rear vertical wall corresponding to the bottom, three water discharge ports including a first water discharge port, a second water discharge port, and a third water discharge port being provided at an edge portion, the first water discharge port being provided at a side of the recessed portion, the second water discharge port being provided at a front of the recessed portion, the third water discharge port being provided at a rear of the recessed portion in the plan view, and the three water discharge ports discharging flush water to one side in a circumferential direction along the edge portion.

According to this aspect, the three jets of flush water ejected from the three jets in one direction in the circumferential direction along the inner circumferential surface of the rim can flush the recessed portion simultaneously with flushing the inner circumferential surface of the rim.

Drawings

Fig. 1 is a side sectional view of a toilet bowl according to a first embodiment.

Fig. 2 is a plan view of the toilet bowl according to the first embodiment.

Fig. 3 is a sectional view taken along line a-a of fig. 1.

Fig. 4 is a view for explaining the left and right center lines of the toilet body and the front and rear center lines of the toilet seat in the first embodiment.

Fig. 5 is a view showing a flow pattern of washing water at an initial stage in the toilet seat according to the first embodiment.

Fig. 6 is a diagram showing a flow pattern of flush water at a halfway stage in the toilet seat according to the first embodiment.

Fig. 7 is another diagram showing a flow pattern of flush water at a halfway stage in the toilet seat according to the first embodiment.

Fig. 8 is a diagram showing the inner circumferences of the first to third edge water guide paths of the edge portion of the first embodiment.

Fig. 9 is a diagram showing a small water delivery method, fig. 9 (a) is a diagram showing a toilet body according to a first modification, and fig. 9 (b) is a diagram showing a toilet body according to a first embodiment.

Fig. 10 is a diagram for explaining a centrifugal force applied to the flush water.

Fig. 11 (a) is a diagram showing a structure around the second water jet according to the first embodiment, and fig. 11 (b) is a diagram showing a structure around the second water jet according to the second modification.

Fig. 12 is a diagram showing a configuration around the third water jet of the first embodiment.

Fig. 13 is a schematic view showing an example of the arrangement of the water jet nozzles in which the effect (1) can be obtained.

Fig. 14 is a schematic view showing an example of the arrangement of the water jet nozzles in which the effect (2) can be obtained.

Fig. 15 is a side sectional view of a toilet bowl according to a second embodiment.

Fig. 16 is a plan view of a toilet bowl according to a second embodiment.

Fig. 17 is a sectional view taken along line a-a of fig. 15.

Fig. 18 is a schematic view illustrating water flow around the redirecting portion of the second embodiment.

Fig. 19 is a diagram for explaining the central axis of the recess in the second embodiment.

Fig. 20 is a plan view showing an enlarged inner edge of the concave portion of the second embodiment.

Fig. 21 is a view schematically showing a flow pattern of washing water in the toilet seat of the second embodiment.

Fig. 22 is a diagram schematically showing a flow range of washing water in the toilet seat of the second embodiment.

Detailed Description

In the following embodiments and modifications, the same components are denoted by the same reference numerals, and redundant description thereof is omitted. In the drawings, for convenience of explanation, a part of the constituent elements is appropriately enlarged, reduced, or omitted.

1. Preferred embodiments of the first invention will be described.

Fig. 1 is a side sectional view of a toilet bowl 10 according to a first embodiment, and fig. 2 is a plan view of the toilet bowl 10.

The toilet bowl 10 includes a bowl main body 12 made of ceramic. The toilet body 12 is a wall-mounted toilet mounted in a state of being hung on the side wall surface 100 of the toilet. Although not shown, a tank for housing the constant temperature water flushing device of the local flushing device, a toilet lid and a toilet seat supported by the tank so as to be vertically rotatable are disposed above the toilet main body 12.

As shown in fig. 1, the toilet body 12 includes: a toilet seat 14 formed at a front portion of the toilet main body 12; and a drain portion (trap)18 communicating with the inside of the toilet seat 14 through an inlet 16 (see also fig. 2) formed at the bottom of the toilet seat 14. The drain portion 18 is a part of a drain passage portion 20 for discharging the waste in the toilet seat 14 to a sewer (not shown). The drainage passage 20 includes a connection pipe 22 connected to a downstream end of the drainage part 18 in addition to the drainage part 18, and the sewage is discharged to the sewage through the inside thereof. Further, the sealing water 24 which cuts off the flow of air in the water passage direction is accumulated in the drain portion 18, and the backflow of the odor from the sewage is prevented by the sealing water 24.

Fig. 3 shows a cross-sectional view taken along line a-a of fig. 1.

As shown in fig. 1 and 3, the toilet seat 14 is formed in an oval shape having a front-rear dimension larger than a left-right dimension in a plan view. The toilet seat 14 includes: a receiving surface portion 26 for receiving dirt; a rim portion 28 connected to an upper edge portion of the receiving surface portion 26 and forming an upper edge portion of the toilet seat 14; and a recess 30 formed to be recessed downward from a lower edge of the receiving surface 26.

The receiving surface portion 26 and the recess portion 30 are continuously provided in a ring shape. The receiving surface portion 26 is formed to be inclined at a downward slope toward the ring center side. The recess 30 is formed in a bottomed shape, and the inlet 16 of the drain portion 18 is opened at the bottom of the recess 30. A part of the seal water 24 is stored in the concave portion 30.

The edge portion 28 is formed with three water discharge ports 32A to 32C (described later). The rim portion 28 has three rim water guide paths 34A to 34C formed to extend from the three water discharge ports 32A to 32C in the circumferential direction of the toilet seat 14. Hereinafter, the term "water jet 32" will be used when the water jets 32A to 32C are collectively referred to, and the term "edge water guide path 34" will be used when the term "edge water guide paths 34A to 34C are collectively referred to.

The edge water guide path 34 is formed to guide wash water sprayed from the water spray 32 to swirl. As shown in fig. 1, the edge water guide path 34 includes: a shelf portion 34a extending from the upper end edge 26a of the receiving surface portion 26 to the outside of the toilet seat 14; an upright wall portion 34b that rises from an outer peripheral end portion of the frame portion 34 a; and an overhang portion 34c extending from the upper end of the standing wall portion 34b toward the inside of the toilet seat 14. As shown in fig. 3, the radial dimension of the frame portion 34a is formed to be shorter as it is separated from the water jet 32 in the swirling rotation direction Da (described later). The same applies to overhang 34 c. Therefore, the washing water ejected from the water ejection port 32 gradually falls to the receiving surface 26 as it goes away from the water ejection port 32.

The three edge water guide paths 34 include first to third edge water guide paths 34A to 34C corresponding to the three first to third water discharge ports 32A to 32C, respectively. The first edge water guide passage 34A is formed so as to extend in the swirling direction Da from the first water jet 32A to the terminal position 34Aa, with the vicinity of the second water jet 32B and the inside thereof being the terminal position 34Aa, in a plan view. The second edge water guide path 34B is formed in the vicinity of the third water discharge port 32C and inside thereof as a terminal position 34Ba, and extends in the swirling rotation direction Da from the second water discharge port 32B to the terminal position 34 Ba. The third edge water guide path 34C is formed to extend from the third water discharge port 32C to the terminal position 34Ca in the vicinity of the first water discharge port 32A and inside thereof as the terminal position 34 Ca. Each of the edge water guide paths 34A to 34C is formed so as to extend over an angular range of at least 1/4 circumferential amounts in an angular range around a center point Cp (described later) of the toilet seat 14.

Fig. 4 is a view for explaining the left and right center lines La of the toilet body 12 and the front and rear center lines Lb of the toilet seat 14.

The left-right center line La of the toilet bowl main body 12 is a straight line that bisects the left-right dimension Lx of the outer surface portion of the toilet bowl main body 12 in plan view and extends in the front-rear direction. Specifically, a straight line bisecting the left-right dimension Lx from the left end position 12L to the right end position 12R of the outer surface portion of the toilet bowl main body 12 becomes the left-right center line La. The front-rear center line Lb of the toilet seat 14 is a straight line that bisects the front-rear dimension Ly of the inner surface portion of the toilet seat 14 and extends in the left-right direction in a plan view of a horizontal cross section passing through the water jet ports 32A to 32C of the toilet seat 14. Specifically, a straight line bisecting the front-rear dimension Ly from the front end position 14F to the rear end position 14R of the inner surface portion of the toilet seat 14 becomes the front-rear center line Lb. The center line Cp of the toilet seat 14 is an intersection of the left and right center lines La and the front and rear center lines Lb.

The toilet seat 14 described above has four divided regions Sr1 to Sr4 that are divided by the left-right center line La and the front-rear center line Lb of the toilet seat 14 in a plan view. Hereinafter, a divided region on the rear side with respect to the front-rear center line Lb and on the right side with respect to the left-right center line La of the four divided regions Sr1 to Sr4 is referred to as a first divided region Sr 1. Among the four divided regions, the divided region located counterclockwise in the plan view from the first divided region Sr1 is defined as a second divided region Sr2, a third divided region Sr3, and a fourth divided region Sr4 in this order. The second divided region Sr2 and the third divided region Sr3 are front divided regions, and the first divided region Sr1 and the fourth divided region Sr4 are rear divided regions.

Returning to fig. 3, the toilet main body 12 further includes a water jet portion 36 having the three water jets 32A to 32C. The water jet unit 36 includes a water passage unit 38 described later, in addition to the three water jets 32A to 32C. The water jet unit 36 jets washing water from the three water jets 32A to 32C in the swirling rotation direction Da along the inner peripheral surface of the rim 28. The water jet unit 36 forms a swirling flow that rotates in one direction in the toilet seat 14 by jetting the flush water from the water jets 32A to 32C into the toilet seat 14. In the present embodiment, a swirling flow is formed that rotates to one side Da (counterclockwise direction) in the circumferential direction of the toilet seat 14. Hereinafter, one side Da in the circumferential direction is referred to as a swirling rotation direction Da.

The three water jet ports 32A to 32C are formed independently in three divided regions of four divided regions Sr1 to Sr4 of the toilet seat 14, respectively. Specifically, the three water jets 32A to 32C include the first water jet 32A located in the first divisional region Sr1, the second water jet 32B located in the third divisional region Sr3, and the third water jet 32C located in the fourth divisional region Sr 4. Any of the water discharge ports 32A to 32C is formed so as to open in the swirling rotation direction Da.

The water passage portion 38 is a hollow portion disposed on the depth side of the rim portion 28 (radially outside the toilet seat 14). The water passage 38 communicates with the water discharge ports 32A to 32C and serves as a passage for flush water to be supplied to the water discharge ports 32A to 32C. The water passage portion 38 includes an inflow path 38a, a right water passage 38b (first water passage), and a left water passage 38c (second water passage). The inflow path 38a is disposed behind and on the depth side of the edge portion 28. The right water passage path 38b is disposed on the deep side of the right portion 28R on one of the left and right side portions of the edge portion 28. The left water passage path 38c is disposed on the deep side of the other left portion 28L out of the left and right side portions of the edge portion 28.

As shown in fig. 1, flush water supplied from a water supply pipe 102 as a part of the flush water supply device flows into the inflow path 38 a. Fig. 1 and 2 show a supply path Ra of flush water from the water supply pipe 102 to the inflow path 38 a. The washing water flows into the inflow path 38a through an introduction hole 38e, and the introduction hole 38e is formed in a rear wall portion 38d disposed behind the rim portion 28 and defining the inflow path 38 a. In the present embodiment, the flush water supply device supplies flush water by a tap water direct-pressure type water supply method using the supply pressure of tap water. As shown in fig. 3, the inflow path 38a is formed to extend in the left-right direction from the inflow position Pa of the washing water from the washing water supply device, i.e., from the front of the introduction hole 38 e. The right water passage 38b communicates with one end portion of the inflow passage 38a in the left-right direction, and the left water passage 38c communicates with the other end portion in the left-right direction.

The right water passage path 38b is formed to extend in the front-rear direction on the depth side of the right portion 28R of the edge portion 28. The first water jet 32A is formed at the downstream end of the right water passage 38 b.

The left water passage path 38c includes a folded portion 38ca formed at a downstream end portion of the left water passage path 38c and a longitudinally extending portion 38cb formed so as to communicate with the folded portion 38ca and extend in the longitudinal direction. The second water jet 32B is formed at the downstream end of the folded-back portion 38ca which is the downstream end of the left water passage 38 c. A branch portion 38cc is formed in the front-rear extending portion 38cb of the left water passage 38c so as to extend radially inward in the rotational flow rotation direction Da from a midway position in the front-rear direction. The third water jet 32C is formed at the downstream end of the branch portion 38cc which is a halfway position of the left water passage 38C. The inner bottom surface 38cd ranging from a halfway position of the front-rear extension portion 38cb to the branch portion 38cc is formed so as to rise as approaching the third water jet 32C.

In the right water passage 38b, the flush water supplied from the inflow passage 38a is guided to flow to the first water jet 32A (see direction Db). In the front-rear extension portion 38cb of the left water passage 38c, a part of the flush water supplied from the inflow passage 38a flows toward the folded portion 38ca (see direction Dc), and the remaining part flows so as to be guided toward the branch portion 38cc (see direction Dd). In the folded portion 38ca, the flushing water supplied from the upstream front-rear extending portion 38cb is folded radially inward and flows to be guided to the second water jet 32B (see direction De).

Next, a flushing method using the toilet seat 14 of the toilet bowl 10 described above will be described.

The toilet bowl 10 flushes the inside of the toilet bowl 14 by a so-called direct flush type flushing method in which the waste in the toilet bowl 14 is flushed into the drain portion 18 by using a water head difference. By operating an operating member such as a switch or lever for starting the supply of flush water, flush water in a predetermined flow rate range is supplied from the flush water supply device into the water passage portion 38 of the toilet bowl 10. Hereinafter, the operation from the start of the supply of the flushing water within the predetermined flow rate range to the end thereof will be described as a single flushing operation.

The flush water flows into the inflow path 38a of the water passage portion 38, and the flush water flowing in flows through the right and left water passages 38b, 38C and is discharged from the water discharge ports 32A to 32C. When the water passage portion 38 is filled with flush water, the flush water supply device applies a water pressure corresponding to the water supply pressure to the flush water in the water passage portion 38, and the flush water applied with the water pressure is discharged from the respective water discharge ports 32A to 32C.

Fig. 5 is a diagram showing a flow pattern of the washing water in the toilet seat 14. In this figure, the initial stage (first stage) of the flow of flush water starting within the toilet seat 14 is shown. In this figure, the flow of flush water within the toilet seat 14 is shown with arrows.

In the initial stage, flush water is discharged from the first water jet 32A and the third water jet 32C into the toilet seat 14, and no flush water is discharged from the second water jet 32B. The washing water ejected from the first water ejection opening 32A forms a water stream Dwa that rotates along the first edge water guide path 34A. The flush water discharged from the third water discharge port 32C forms a water stream Dwb that rotates along the third edge water guide path 34C. The wash water flowing along the edge

water guide paths

34A and 34C gradually falls from the shelf portions 34A of the edge

water guide paths

34A and 34C to the receiving surface portion 26, and forms a water flow Dwc that rotates downward of the receiving surface portion 26.

In this way, in order to adjust the timing of starting the ejection of the washing water from the respective water discharge ports 32A to 32C, the water discharge portion 36 is set so that the length of the water passage path from the inflow position Pa of the washing water in the water passage portion 38 to the respective water discharge ports 32A to 32C satisfies a predetermined condition. Specifically, the lengths of the water passage paths from the inflow position Pa of the flush water in the water passage portion 38 to the first water jet 32A, the second water jet 32B, and the third water jet 32C are La1, La2, and La3, respectively. At this time, the length La2 of the water passage path of the second water jet 32B is set to be longer than the lengths La1 and La3 of the water passage paths of the first water jet 32A and the third water jet 32C.

Note that the timings at which the flushing water starts to be ejected from the first water ejection port 32A and the third water ejection port 32C are equivalent timings in the present embodiment. The term "equivalent" herein includes both the case where the two objects to be compared are the same and the case where the two objects to be compared are substantially the same. Here, the term "flush water discharge start timing" means both the case where the timing for starting the discharge of flush water is the same and the case where the timing is substantially the same. The same applies to the interpretation of "equivalent" below.

Fig. 6 and 7 are other views showing the flow pattern of the flush water in the toilet seat 14. In this figure, a halfway stage (second stage) after an elapse of time from the initial stage is shown. Fig. 6 is a sectional view taken along line a-a of the toilet bowl 10 as in fig. 3, and fig. 7 is a sectional view taken along a side surface of the toilet bowl 10. First, description is made with reference to fig. 6.

At the intermediate stage, the flushing water is discharged from the second water discharge port 32B in addition to the flushing water discharged from the first water discharge port 32A and the third water discharge port 32C into the toilet seat 14. The flow of the washing water ejected from the first water ejection port 32A and the third water ejection port 32C is the same as that in the initial stage.

The washing water ejected from the second water ejection port 32B forms a water stream Dwd that rotates along the second edge guiding path 34B. The washing water flowing along the second edge water guide path 34B gradually falls from the shelf portion 34a of the second edge water guide path 34B to the receiving surface portion 26, forming a water flow Dwe that rotates toward the lower side of the receiving surface portion 26. The washing water discharged from the water discharge ports 32A to 32C forms water flows Dwa, Dwb, Dwc, Dwd, Dwe as swirling flows swirling in the swirling direction Da in the toilet seat 14. The water streams Dwc and Dwe rotate toward the lower side of the receiving surface portion 26 of the toilet seat 14, and flow into the recess 30 from the upper side of the receiving surface portion 26.

The water stream Dwc includes a water stream Dwc (1) in which a part of the flush water ejected from the second water ejection port 32B and a part of the flush water ejected from the third water ejection port 32C are merged. The water flow Dwc (1) is formed mainly on the receiving face portion 26 behind the recess 30. The water flow Dwc includes a water flow Dwc (2) in which a part of the flush water discharged from the third water discharge port 32C and a part of the flush water discharged from the first water discharge port 32A are merged. The water current Dwc (2) is mainly formed on the receiving surface portion 26 of the second divided region Sr2, which is the upstream divided region, of the two front divided regions Sr2 and Sr 3.

Here, a part of the washing water discharged from the second water discharge port 32B and a part of the washing water discharged from the first water discharge port 32A join together to form a main flow Fw toward the inlet 16 of the drain portion 18. The main flow Fw is mainly formed on the receiving face portion 26 in a range from the third divided region Sr3, which is the downstream side divided region, of the two front divided regions Sr2, Sr3 to the fourth divided region Sr4 adjacent to the third divided region Sr3 in the swirling rotation direction Da. More specifically, the main flow Fw is formed on the receiving surface portion 26 of the third divided region Sr3 and the fourth divided region Sr4 on the front side (left side) of the third divided region Sr3 out of the two front divided regions Sr2 and Sr3 as viewed from the recessed portion 30 of the toilet seat 14 (see range Sa).

The flushing water ejected from the first water ejection port 32A and the second water ejection port 32B are merged, and the main flow Fw becomes a water flow with strong water impact and a large flow rate. As shown in fig. 6 and 7, the main flow Fw flows from above the receiving surface portion 26 into the inlet 16 of the drain portion 18 through the recess 30. More specifically, the main flow Fw flows from the third divisional region Sr3 toward the fourth divisional region Sr4 on the receiving face portion 26, i.e., from the front side toward the rear side on the receiving face portion 26, and then flows into the recess 30 from the oblique front side (left side and front side) with respect to the recess 30. At this time, the waste in the recess 30 of the toilet seat 14 is flushed into the drain portion 18 through the inlet 16 by the difference in level of the flush water flowing as the aforementioned swirling flow, particularly the difference in level of the flush water flowing as the main flow Fw. The "difference in the water level of the flush water flowing as the main flow Fw" herein refers to a difference Hd in the height from the merging position of the flush water ejected from the first water ejection port 32A and the second water ejection port 32B to the inlet 16 of the drain portion 18 (see fig. 7).

In the concave portion 30, the main flow Fw flows into the concave portion 30, and thus a water flow Dwf is formed which collides with the right side wall portion 30a (first side wall portion) of the concave portion 30 and then flows forward, in addition to the water flow toward the inlet 16 of the drain portion 18. The water flow Dwf flows along the right side wall 30a of the recess 30 and then collides with the left side wall 30 b. The water flow Dwf rises and flows so as to be pushed up by the impact of the right side wall 30a and the left side wall 30b hitting the recess 30. This rising water flow Dwf merges with a water flow Dwc (2) flowing into the recess 30 from the front side toward the rear side on the receiving surface portion 26 (see range Sb), and forms a water flow Dwg toward the inlet 16 of the drain portion 18. Similarly to the water flow Dwc (2), the water flow Dwg also flows from the front side to the rear side in the toilet seat 14.

The above effects of the toilet bowl 10 are explained.

(1) According to the toilet bowl 10 described above, the independent water discharge ports 32A to 32C are formed in three of the four divisional areas Sr1 to Sr4, respectively. Therefore, the inner circumferential length of the edge portion 28 from each of the water discharge ports 32A to 32C to the other water discharge ports adjacent in the swirling rotation direction Da can be shortened as compared with the case where independent water discharge ports are formed in two of the four divided regions Sr1 to Sr 4. Consider the case where the water jet is assumed to be formed independently in two divided regions. The washing water flowing along the inner peripheral surface of the rim 28 falls downward by gravity. Therefore, in this case, since the inner circumference of the edge portion 28 from the water jet to the other water jet is long, it is difficult to obtain a sufficient amount of flush water at a position distant from the water jet. In this regard, according to the present embodiment, since the inner circumferential length of the rim portion 28 from the water discharge port to the other water discharge ports can be shortened as a whole in the rim portion 28, flush water can easily reach the whole inner circumferential surface of the rim portion 28, and a good rim flushing capability can be obtained.

(2) The main flow Fw toward the inlet 16 of the drain portion 18 is formed by merging the flush water discharged from the first water discharge port 32A and the flush water discharged from the second water discharge port 32B. Since the second water jet 32B is located in the front third divisional area Sr3, the path through which the flush water flows in the section from the second water jet 32B to the inlet 16 of the water discharge portion 18 can be shortened as compared with the case where the flush water is provided in the rear divisional area. As a result, the water impact of the main flow Fw formed by the flush water ejected from the second water ejection port 32B becomes strong, and the sewage in the toilet seat 14 is flushed into the inlet 16 of the drain portion 18 by the strong water-impacted main flow Fw, whereby good sewage discharge performance can be obtained.

The main flow Fw toward the inlet 16 of the drain portion 18 is mainly formed by the merging of the flush water discharged from the first water discharge port 32A and the flush water discharged from the second water discharge port 32B on the inner peripheral surface of the toilet seat 14, which is the upper surface of the receiving surface portion 26. Therefore, the receiving face portion 26 can be flushed by the main flow Fw of the strong water impact, and good flushing performance of the toilet seat can be obtained.

In addition, in order to obtain good rim flushing performance, waste discharge performance, and toilet seat flushing performance, it is also conceivable to increase the entire amount of flushing water used for flushing the toilet once, or to increase the discharge amount of flushing water by increasing the opening area of the water jet. In this regard, according to the present embodiment, since it is not necessary to increase the entire amount of flush water used for flushing the toilet once, it is possible to obtain good rim flushing capability, waste discharge performance, and toilet seat flushing performance while preventing an increase in the entire amount of flush water. Further, since it is not necessary to increase the opening area of the water jet, it is possible to obtain good rim washing performance, dirt discharge performance, and toilet seat washing performance while preventing the opening area of the water jet from increasing. In particular, since the opening area of the spout can be prevented from increasing, it is possible to obtain a good appearance and also obtain good rim washing ability, dirt discharge performance, and toilet seat washing performance by reducing the size of the spout.

In addition, in order to make the flush water reach the entire inner peripheral surface of the rim portion 28, the longer the inner peripheral length of the rim portion 28 from one water jet to the other water jet, the more the flush water ejection amount of one water jet needs to be increased, and the size of the rim water guide path 34 connected to one water jet needs to be increased in addition to this. In this regard, according to the present embodiment, the inner circumferential length of the edge portion 28 from one water jet to the other water jet can be shortened as compared with the case where two water jets are formed in the edge portion 28. Therefore, the discharge amount of the flush water from the three water discharge ports 32A to 32C can be reduced and the dimensions such as the width of the frame portion 34a and the height of the standing wall portion 34b of the rim water guide path 34 can be reduced in order to make the flush water reach the entire inner peripheral surface of the rim portion 28.

The water jet unit 36 is configured to jet the cleaning water from the second water jet 32B after the cleaning water is jetted from the first water jet 32A and the third water jet 32C, and therefore has the following advantages. When the ratio of the flow rate of the main flow Fw, that is, the main flow rate, to the total flush water amount for one flush operation is increased, the main flow rate can be increased without increasing the total flush water amount, and the waste discharge capacity and the toilet seat flushing capacity can be improved by increasing the main flow rate. According to the present embodiment, since the amount of flush water discharged from the second water discharge ports 32B and flowing into the inlet 16 without merging can be reduced, the ratio of the main flow rate to the entire flush water amount can be increased. Therefore, the waste discharge capacity and the toilet seat flushing capacity can be improved by increasing the ratio of the main flow rate without increasing the whole flushing water amount.

Next, other features related to the first to third water discharge ports 32A to 32C will be described.

The water jet unit 36 is configured to have the largest discharge amount of flush water from the first water jet 32A, the second water jet 32B, and the third water jet 32C. That is, the discharge amount of the flush water is configured to decrease in the order of the first water jet 32A, the second water jet 32B, and the third water jet 32C. From another point of view, the first water jet 32A is configured to have a larger discharge amount of flush water than the other two second water jets 32B and the third water jet 32C. The discharge amount of the washing water herein means a flow amount (L/s) of the washing water per unit time passing through the water jet.

In order to satisfy the relationship between the discharge amounts of the washing water from the respective water discharge ports 32A to 32C, the water discharge portion 36 is configured as follows. The water passage path in the water passage portion 38 from the inflow position Pa (see fig. 3) of the flush water from the flush water supply device to the respective water discharge ports 32A to 32C will be discussed. The water passage paths are assumed to correspond to the first water jet 32A to the third water jet 32C, respectively. The discharge amount of the flush water from the water jet is proportional to the passage cross-sectional area of the portion of the water passage (hereinafter referred to as "flow rate setting portion") where the passage cross-sectional area is smallest in the water passage through which the flush water is supplied to the water jet. In the present embodiment, the flow rate setting portion of the first water jet 32A is the first water jet 32A itself located at the downstream end of the water passage of the first water jet 32A. The flow rate setting portion of the second water jet 32B is also the second water jet 32B itself, and the flow rate setting portion of the third water jet 32C is also the third water jet 32C itself.

The water jet unit 36 is configured such that the passage cross-sectional area of the first water jet 32A, that is, the opening area, is the largest, the opening area of the second water jet 32B is the second largest, and the third water jet 32C is the smallest. That is, the opening area is configured to decrease in the order of the first water jet 32A, the second water jet 32B, and the third water jet 32C. From another point of view, the first water jet 32A is configured to have a larger opening area than the other two second water jets 32B and the third water jet 32C. The opening area (passage cross-sectional area) herein means a cross-sectional area in a cross-section perpendicular to the water passage direction. Accordingly, the magnitude relationship of the discharge amount of the washing water from each of the water discharge ports 32A to 32C is configured to be the same as the magnitude relationship of the opening area of each of the water discharge ports 32A to 32C.

Fig. 8 is a view showing inner circumferences Lb1 to Lb3 of the edge water guide paths 34A to 34C of the edge portion 28.

The inner circumferential length here refers to the length of the inner circumferential surface in the range from the water discharge ports 32A to 32C located at the start end positions of the edge water guide paths 34A to 34C to the end positions 34Aa to 34Ca of the edge water guide paths 34A to 34C in a horizontal cross section passing through the edge portion 28. For example, the inner circumferential length Lb1 of the first edge guiding path 34A is an inner circumferential surface length in a range from the first water jet 32A to the terminal end position 34Aa of the first edge guiding path 34A.

The edge portion 28 is formed such that the inner circumferential length Lb1 of the first edge water guide path 34A is longest, the inner circumferential length Lb2 of the second edge water guide path 34B is longest, and the inner circumferential length Lb3 of the third edge water guide path 34C is shortest. That is, the inner circumference Lb1, the inner circumference Lb2, and the inner circumference Lb3 are formed to be shorter in this order. The ratio of the inner circumferences Lb1, Lb2, Lb3 is, for example, Lb 1: lb 2: lb3 ═ 5: 3: 2.

the water jet unit 36 is configured such that the magnitude relation of the discharge amount of flush water from each of the three water jet ports 32A to 32C is the same as the magnitude relation of the inner peripheral lengths Lb1 to Lb3 of the first to third edge water guide paths 34A to 34C to which each of the three water jet ports 32A to 32C is connected. For example, the first water jet 32A connected to the first edge water guide path 34A having the longest inner peripheral length Lb1 has the largest discharge amount of flush water. The third water jet 32C connected to the third edge water guide path 34C having the shortest inner peripheral length Lb3 has the smallest discharge amount of flush water.

More specifically, the water jet unit 36 is configured such that the ratio of the jet rate of the flush water of each of the three water jet ports 32A to 32C corresponds to the ratio of the inner peripheral lengths Lb1 to Lb3 of the first to third edge water guide paths 34A to 34C connected to each of the three water jet ports 32A to 32C. For example, the ratio of the inner circumferential lengths Lb1 to Lb3 is 5: 3: in case 2, the ratio of the discharge amounts of the flushing water from the three water discharge ports 32A to 32C corresponds to 5: 3: the method of claim 2. The water jet unit 36 is configured such that the ratio of the jet amount of the cleaning water of each of the three water jet ports 32A to 32C corresponds to the ratio of the opening area of each of the three water jet ports 32A to 32C.

According to the above feature, since the first water jet 32A discharges a larger amount of flush water than the other second water jet 32B and third water jet 32C, the main flow Fw is easily formed in the toilet seat 14 by the flush water discharged from the first water jet 32A. Therefore, by adjusting the positions of the water discharge ports 32A to 32C, the discharge direction of the flush water, and the like, it is possible to variously set the flow pattern of the main flow Fw in the toilet seat 14, and it is possible to improve the degree of freedom of the flush pattern of the flush water.

The three water discharge ports 32A to 32C are configured such that the magnitude relation of the discharge amounts of flush water is the same as the magnitude relation of the inner circumferences of the first to third edge water guide paths 34A to 34C connected to the three water discharge ports 32A to 32C. Therefore, a large amount of flush water can be made to flow into the first edge water guide path 34A of the inner circumference, and a sufficient amount of flush water can easily reach the entire first edge water guide path 34A. Further, by making a small amount of flush water flow through the third edge water guide path 34C having a short inner circumference, the amount of flush water used in the third edge water guide path 34C can be suppressed. Therefore, while a sufficient amount of flush water reaches the entire inner peripheral surface of the rim portion 28 to obtain a good rim flushing capability, it is easy to suppress the amount of flush water used for flushing the entire inner peripheral surface of the rim portion 28.

Further, since the first water jet 32A having a larger discharge amount of flush water than the other two

water jets

32B and 32C is provided in the first divided region on the rear side, there are the following advantages. In order to increase the discharge amount of the flush water from the first water jet 32A as compared with the other two

water jets

32B and 32C, the right water passage 38B for supplying the flush water to the first water jet 32A needs to have a larger passage cross-sectional area than the left water passage 38C. According to the present embodiment, since the first water jet 32A having a large discharge amount of flush water is provided in the rear divided region, the front-rear dimension of the right water passage 38b having a large passage cross-sectional area is suppressed as compared with the case where the first water jet 32A is provided in the front divided region, and the water jet unit 36 can be easily downsized. Therefore, the water discharge portion 36 can be easily miniaturized as a whole while obtaining excellent rim washing ability, waste discharge ability, and toilet seat washing ability.

The water jet unit 36 is configured such that the total amount of the flushing water jet rate of the first water jet 32A and the second water jet 32B (hereinafter also referred to as "total jet rate") is greater than the flushing water jet rate of the third water jet 32C. Accordingly, it can be expected that more than half of the entire amount of flushing water used for one flushing operation is used for forming the main flow Fw. Therefore, the flow rate of the main flow Fw of the strong water impact can be increased, the receiving surface portion 26 of the toilet seat 14 can be flushed by the main flow Fw of the strong water impact and the large flow rate, and a good toilet seat flushing capability can be obtained. In addition, the main flow Fw with strong water impact and a large flow rate flushes the waste in the toilet seat 14 into the inlet 16 of the drain portion 18, thereby obtaining a particularly good waste discharge performance. From the viewpoint of obtaining such an action and effect, the water jetting portion 36 is preferably configured such that the ratio of the total jetting amount of the first water jetting port 32A and the second water jetting port 32B to the entire rinsing water amount used in one rinsing operation is 60% to 80%. The total flush water amount here is synonymous with the total amount of the respective flush water discharge amounts of the first to third water discharge ports 32A to 32C.

Preferably, the water jet unit 36 is configured such that the ratio of the discharge amount of the flushing water from the first water jet 32A to the total flushing water amount used in one flushing operation is 40% to 60%.

Further description is made with respect to other features of the first to third water discharge ports 32A to 32C.

As shown in fig. 3, the first to third water discharge ports 32A to 32C are formed independently in the two front second divisional regions Sr2, the third divisional region Sr3 located on the downstream side in the swirl rotation direction Da of the third divisional region Sr3, the two rear first divisional regions Sr1, and the fourth divisional region Sr4, respectively. In other words, the first to third water discharge ports 32A to 32C are not formed in the second divisional region Sr2 on the two front sides, and the second divisional region Sr2 on the upstream side in the swirling rotation direction Da of the third divisional region Sr 3.

Illustrating the advantages thereof. Fig. 9 (a) is a diagram showing the toilet main body 12 according to the first modification. In this example, the second water jet 32B is formed in the second divisional region Sr 2.

When a user urinates while sitting on the toilet seat of the toilet bowl 10, urine received by the receiving surface portion 26 of the toilet seat 14 may splash around (see direction Df). At this time, when the splashed urine splashes on the inner peripheral surface area including the left and right center positions 28a on the front side of the edge portion 28, the urine may be transmitted in the inner peripheral surface area in the circumferential direction and may enter the right water passage 38B from the second water jet 32B.

In this regard, according to the present embodiment, as shown in fig. 9 (B), when urine splashes into the inner peripheral surface region including the left and right center positions 28a on the front side of the edge portion 28, the urine that has passed through the inner peripheral surface region in the circumferential direction is less likely to enter the deep side in the left water passage 38B from the second water jet 32B. Therefore, the possibility of the urine component remaining on the deep side of the second water ejection port 32B (in the water passing portion 38 of the water ejection portion 36) is suppressed, and the generation of dirt and odor can be prevented accordingly. Thus, good edge rinsing capability can be obtained while good cleanability is obtained.

The above configuration also has the following advantages. Fig. 10 is a view showing the toilet main body 12 according to the first modification of fig. 9 (a).

The washing water flowing along the inner peripheral surface of the toilet seat 14 is given a centrifugal force Fc directed radially outward. The centrifugal force Fc increases as the radius of curvature of the portion where the washing water flows decreases, and the water impact of the water flow flowing toward the inlet 16 of the drain 18 tends to be weakened as the centrifugal force increases.

Consider the case where it is assumed that the second water jet 32B is provided in the second divisional region Sr 2. In this case, the flush water discharged from the water discharge port 32 flows through the inner peripheral surface region located at the left and right center positions Pa on the front side of the rim portion 28. Since the toilet seat 14 is formed in an oval shape having a front-rear dimension larger than a left-right dimension, an inner peripheral surface area located at the left-right center position Pa is generally likely to be smaller than a curvature radius at other positions. Therefore, when the second water jet is provided in the second divisional area Sr2, the water impact of the flush water ejected from the second water jet 32B tends to be weakened by the centrifugal force Fc.

In this regard, according to the present embodiment, since the second water jet 32B is provided in the third divided region Sr3, the flush water discharged from the second water jet 32B is caused to flow toward the inlet 16 of the drain portion 18 without passing through the inner peripheral surface region located at the left and right center positions Pa of the edge portion 28 having a small radius of curvature. Therefore, the water impact of the main flow Fw formed by the flushing water discharged from the second water jet 32B is not easily weakened by the centrifugal force Fc, and the flushing capability and the waste discharge capability of the toilet seat can be improved as compared with the case where the second water jet 32B is disposed in the second divisional area Sr 2.

Illustrating other features of toilet 10.

Refer to fig. 3. The left water passage 38c for supplying flush water to the second water jet 32B is formed to extend in the front-rear direction on the deep side of the left portion 28L. The left water passage path 38c is formed on the deep side of the left portion 28L on the side where the third divided region Sr3 of the second water jet 32B is formed, of the left portion 28L and the right portion 28R of the edge portion 28. The left water passage path 38c is formed to extend across the front-rear center line Lb on the depth side of the left portion 28L in a plan view. From another point of view, the left water passage path 38c is not formed to extend across the front-rear center line Lb on the depth side of the right portion 28R of the edge portion 28. Illustrating the advantages thereof.

According to the above configuration, the left water passage path 38c can be arranged in a layout not passing through the left and right center positions Pb on the front side of the edge portion 28 but on the deep side. Therefore, compared to the case where the water passage path is arranged to pass through the longitudinal side of the left and right center positions Pb of the edge portion 28, the water passage path of the flush water from the inflow position Pa can be shortened, and the flush water with strong water impact can be ejected from the second water jet 32B. As a result, more excellent rim washing ability, toilet seat washing ability, and waste discharge ability can be obtained. This effect can be obtained more effectively as the position of the second water jet 32B is closer to the rear side of the third divisional region Sr3 of the toilet seat 14.

Further, when the water passage path is arranged to pass through the longitudinal side of the left-right center position Pb on the front side of the edge portion 28, the water passage path for the first water jet 32A and the water passage path for the second water jet 32B need to be arranged in the left-right direction in the depth direction of the right portion 28R of the edge portion 28. In this regard, according to the above-described configuration, the right water passage 38B for the first water jet 32A and the left water passage 38c for the second water jet 32B are not arranged in the horizontal direction at the depth side of the right portion 28R of the rim portion 28. Therefore, the width dimension of the depth side portion of the right side portion 28R of the rim portion 28 can be reduced. Accordingly, as shown in fig. 1 and 2, the width of the side portion 12b of the upper surface portion 12a of the toilet main body 12, which extends laterally from the upper end edge of the toilet seat 14, can be reduced.

A linear section 34Bb extending linearly is formed on the inner peripheral surface of the second edge water guide path 34B at a position apart from the second water jet 32B in the swirling rotation direction Da. In the inner peripheral surface of the second edge water guide passage 34B, a curvature decreasing section 34Bc is formed in a continuous range from the second water jet 32B to the straight section 34Bb so that the curvature decreases with distance from the second water jet 32B. Further, a linear section 34Cb extending linearly is also formed on the inner peripheral surface of the third edge water guide path 34C at a position apart from the third water jet 32C in the swirling rotation direction Da. A curvature decreasing section 34Cc, which is formed such that the curvature decreases as the distance from the third water jet 32C increases, is formed on the inner peripheral surface of the third edge water guide path 34C in a continuous range from the third water jet 32C to the straight section 34 Cb.

In this way, the inner peripheral surfaces of the edge

water guide paths

34B and 34C are formed with curvature decreasing sections 34Bc and 34Cc continuing from the

water discharge ports

32B and 32C. Therefore, in the range from the start of discharge from the respective

water discharge ports

32B and 32C to the passage of the straight sections 34Bb and 34Ca, the flush water immediately after discharge from the respective

water discharge ports

32B and 32C and having strong water impact flows in the section having a large radius of curvature, and therefore, it is difficult for the flush water flowing in this range to be given a large centrifugal force. Therefore, the water flow toward the inlet 16 of the drain portion 18 after being discharged from the

water discharge ports

32B and 32C is less likely to be weakened from a state in which the water is immediately discharged from the

water discharge ports

32B and 32C and the water impact is strong. As a result, the water flow which is strongly impacted by the water flow washes away the dirt, and a more excellent dirt discharge performance can be obtained.

Fig. 11 (a) is a diagram showing a structure around the second water jet 32B according to the embodiment.

The second water jet port 32B is partially formed by an inner standing wall portion 34B (hereinafter also referred to as "inner standing wall portion 34B (1)") and an outer standing wall portion 34B (hereinafter also referred to as "outer standing wall portion 34B (2)") adjacent in the radial direction of the toilet seat 14. Of the two standing wall portions 34b, the circumferential end portion 34ba of the outer standing wall portion 34b (2) and the circumferential end portion 34bb of the inner standing wall portion 34b (1) are arranged on a virtual line Lc extending from the center point Cp of the toilet seat 14. The term "aligned" herein includes a case where the two standing wall portions 34b are aligned so as to overlap each other in the circumferential direction within an angular range of 3 ° or less when viewed from the center point Cp of the toilet seat 14. The two standing wall portions 34b may be arranged so that an angular range in which they overlap in the circumferential direction when viewed from the center point Cp of the toilet seat 14 is 3 ° or less. Illustrating the advantages thereof.

Fig. 11 (B) is a diagram showing a structure around the second water jet 32B according to the second modification. Consider a case where, as shown in fig. 11 (b), the circumferential end portions 34ba, 34bb of the two standing wall portions 34b are not aligned on the virtual line Lc, and the angular range in which the two standing wall portions 34b overlap in the circumferential direction is increased. In this case, the respective waterway portions 40 connected to the upstream end and the downstream end of the folded-back portion 38ca, respectively, are formed in line in the radial direction. Here, due to the relationship that the edge water guide path 34A and the like are formed radially inward with respect to the folded-back portion 38ca, two inner wall surfaces 38f of the folded-back portion 38ca that are diametrically opposed are easily formed so as to be narrower in width as going toward the terminal end position 38g of the folded-back portion 38 ca. Therefore, the width dimension of each waterway portion 40 is also easily formed so as to become narrower as it approaches the folded-back portion 38 ca. Therefore, in the path Rb from the front-rear extending portion 38cb of the left water passage 38c to the second water discharge port 32B via the folded portion 38ca, a portion having a smaller passage cross-sectional area than the second water discharge port 32B is easily formed on both sides in the radial direction of the inner standing wall portion 34B (see the range Sc). As a result, it is difficult to design the flow rate setting unit, which is the portion of the water passage connected to the second water jet 32B having the smallest passage cross-sectional area, to be the second water jet 32B.

On the other hand, as described above, if the circumferential end portions 34ba, 34bb of the two standing wall portions 34b are formed so as to be lined up on the virtual line Lc, it is difficult to form the respective water passage portions 40 respectively connected to the upstream end and the downstream end of the folded-back portion 38ca so as to be lined up in the radial direction. Therefore, in the path Rb, a portion having a smaller passage cross-sectional area than the second water jet 32B is difficult to form, and the second water jet 32B can be easily designed as the flow rate setting portion.

Since the second water jet 32B is formed in the divided region Sr3 on the front side of the toilet seat 14, it is positioned at a position that is not easily visible to the user during normal use. Therefore, even when the peripheral end portions 34ba and 34bb of the two standing wall portions 34B forming the second water discharge port 32B are arranged in line and the structure on the deep side can be seen from the second water discharge port 32B in some cases, the second water discharge port 32B itself is made difficult to be visually recognized, and a reduction in the appearance can be prevented. Further, the term "in normal use" as used herein refers to a case where the toilet bowl 10 is approached from the front and then the toilet is seated on a toilet seat for defecation.

Fig. 12 is a diagram showing the configuration around the third water jet 32C.

The width dimension of the left water passage 38c at the position where the left water passage 38c and the front-rear center line Lb overlap in plan view is W1. A width change region 38h in which the width dimension gradually increases from the front-rear center line Lb toward the rear is formed in the left water passage path 38 c. In the width varying region 38h, when the position 38i of the width W2 that is twice the width W1 is set as the reference position 38i, the third water jet 32C is formed rearward of the reference position 38 i. If the third water jet 32C is formed at a position (for example, the range Sd) forward of the reference position 38i, a wall portion for introducing flush water into the third water jet 32C needs to be secured around the third water jet, and therefore the water passage path from the periphery thereof to the second water jet 32B tends to become narrow. On the other hand, if the third water jet 32C is formed rearward of the reference position 38i, the water passage path toward the second water jet 32B is not easily narrowed by the wall portion for introducing the washing water into the third water jet 32C, and it is easy to supply a sufficient amount of the washing water to the second water jet 32B.

The first invention has been described above based on the embodiments, but the embodiments only show the principle and application of the first invention. In the embodiment, various modifications and changes in arrangement can be made without departing from the scope of the concept of the first invention defined in the claims.

Although the flush toilet 10 has been described as using the direct flush type as an example of the flush method, the inside of the toilet seat 14 may be flushed by a flush method combined with another method such as the siphon type or the siphon jet type. Although the toilet bowl 10 has been described as using a direct-pressure type of tap water as an example of the water supply system, a gravity-type water supply system using gravity, a flush valve-type water supply system, or the like may be used. The toilet body 12 is described by taking a wall-mounted toilet as an example, but may be a floor-mounted toilet installed on the floor of a toilet. The toilet body 12 may be made of a material such as resin, in addition to ceramics.

The shelf portion 34a of the edge water guide path 34 may be formed such that the inclination of the upper surface portion continuous with the upper end edge 26a of the receiving surface portion 26 is gentler than the inclination of the inner surface portion of the receiving surface portion 26 continuous with the upper end edge 26a of the receiving surface portion 26. As long as such a condition is satisfied, the upper surface portion of the frame portion 34a may be formed in a planar shape as shown in fig. 1 and the like, or may be formed in an arc shape. The vertical cross section of the edge water guide passage 34 perpendicular to the rotational flow direction D may have a curved shape formed by an upper surface portion of the frame portion 34a of the edge water guide passage 34 and a lower surface portion of the overhang portion 34c being continuous. In addition, the edge water guide path 34 may not have the overhang 34 c. In addition, although the three edge water guide paths 34A to 34C are described as being formed so as not to be continuous with and disconnected from the other edge water guide paths at the terminal positions 34Aa, 34Ba, and 34Ca, they may be formed so as to be continuous with the other edge water guide paths.

From the viewpoint of obtaining the above-described operational effect (1), the three water discharge ports 32A to 32C may be formed independently in three divided regions of the four divided regions Sr1 to Sr 4. From this viewpoint, the positions of the three water discharge ports 32A to 32C are not limited to those of the embodiment.

Fig. 13 is a schematic diagram showing an example of the arrangement of the water discharge ports 32A to 32C in which the operational effect (1) can be obtained.

From the viewpoint of obtaining the operational effect (1), for example, as shown in fig. 13 (a), the first water jet 32A may be formed in the first divisional region Sr1, the second water jet 32B may be formed in the second divisional region Sr2, and the third water jet 32C may be formed in the fourth divisional region Sr 4. As shown in fig. 13 (B), the first water jet 32A may be formed in the first divisional region Sr1, the second water jet 32B may be formed in the second divisional region Sr2, and the third water jet 32C may be formed in the third divisional region Sr 3. As shown in fig. 13 (C), the first water jet 32A may be formed in the second divisional region Sr2, the second water jet 32B may be formed in the third divisional region Sr3, and the third water jet 32C may be formed in the fourth divisional region Sr 4. In this way, the first water jet 32A having the largest discharge amount of flush water may be formed in the front divided region, not in the rear divided region. In any case, it can be said that, among the four divisional regions Sr1 to Sr4, water jet ports are not formed in one divisional region, and water jet ports are formed independently in the other three divisional regions.

The three water jet ports 32A to 32C may be formed so that at least one of the three divided regions Sr1 to Sr4 is included in each of the four divided regions Sr1 to Sr4, or may be formed so as to extend over adjacent divided regions. For example, the second water jet 32B may be formed in the third divisional region Sr3 and the third water jet 32C may be formed in the fourth divisional region Sr4, and the first water jet 32A may be formed so as to straddle the first divisional region Sr1 and the second divisional region Sr 2. In addition, the second water jet 32B may be formed so as to extend over the adjacent divided regions, or the third water jet 32C may be formed so as to extend over the adjacent divided regions. In addition, from the viewpoint of obtaining the above-described operation effect (1), the three water discharge ports 32A to 32C may be arranged so as to be separated by an angular range of 1/4 circumferences or more as viewed from the center point Cp of the toilet seat 14. The discharge amount and opening area of the flushing water from the three water discharge ports 32A to 32C are not limited to those of the embodiment. For example, the three water discharge ports 32A to 32C may be made to have the same discharge rate of flush water, or only two of the three water discharge ports 32A to 32C may be made to have the same discharge rate of flush water.

In addition, from the viewpoint of obtaining the above-described operation effect (2), it is not essential to form three water discharge ports 32A to 32C, and at least two water discharge ports may be formed. Here, the toilet seat 14 is set to have two divided regions divided by the front-rear center line Lb. Here, as an example of fig. 3, one of the two divided regions is composed of the first divided region Sr1 and the fourth divided region Sr4, and the other is composed of the second divided region Sr2 and the third divided region Sr 3. In this case, the two water jet ports may include the first water jet port 32A formed in any one of the two divided regions Sr1 to Sr4 and the second water jet port 32B formed in the front divided region. In this case, the second water jet 32B may be formed in the same divided region as the divided region in which the first water jet 32A is formed, or may be formed in another divided region. The positions of these two

water jets

32A, 32B are not limited to the content of the embodiment.

Fig. 14 is a schematic diagram showing the arrangement of the

water jet ports

32A, 32B in which the effect (2) can be obtained.

From the viewpoint of obtaining the operational effect (2), for example, as shown in fig. 14 (a), the first water jet 32A may be formed in the first divisional region Sr1, and the second water jet 32B may be formed in the third divisional region Sr 3. As shown in fig. 14 (B), the first water jet 32A may be formed in the second divisional region Sr2, and the second water jet 32B may be formed in the third divisional region Sr 3. In addition, as shown in fig. 14 (C), the third water jet 32C may be formed in the fourth divisional area Sr 4.

In addition, an example in which the respective water discharge ports 32A to 32C of the rim portion 28 of the toilet seat 14 are arranged so that their positions overlap in the vertical direction is described. In addition, the water discharge ports 32A to 32C of the edge portion 28 may be arranged at positions shifted in the vertical direction, without overlapping the positions of any or all of the water discharge ports 32A to 32C in the vertical direction. In this case, the front-rear center line Lb of the toilet seat 14 is defined by a straight line that bisects the front-rear dimension of the inner surface portion of the toilet seat 14 and extends in the left-right direction, in a plan view of a horizontal cross section passing through the lowermost water jet.

As described above, the water spray portion 36 is configured as follows: the washing water discharged from the first water discharge port 32A and the washing water discharged from the second water discharge port 32B are merged to form a main flow Fw directed toward the inlet 16 of the drainage passage portion. The water ejection portion 36 can be configured as follows: such a main flow Fw is formed by adjusting the position of each of the

water discharge ports

32A, 32B, the discharge amount of the washing water, and the discharge direction of the washing water.

The same example is described for the timing at which the first water jet 32A and the third water jet 32C start to jet flush water (hereinafter referred to as "jet start timing"). The discharge start timing may be earlier than the discharge start timing of the washing water discharged from the second water discharge port 32B, and the discharge start timing may be shifted between the first water discharge port 32A and the third water discharge port 32C.

In addition, an example in which the water jet unit 36 adjusts the passage cross-sectional area of the water passage corresponding to the water jet ports 32A to 32C in order to adjust the discharge amount of the washing water from the water jet ports 32A to 32C has been described. In addition, the discharge amount of the flush water may be adjusted by a throttle valve or the like provided in the middle of the water passage to each of the water discharge ports 32A to 32C. Further, a valve mechanism such as an electrically driven valve may be used to adjust the timing at which the water jet ports 32A to 32C start jetting out the washing water.

The first invention embodied by the above embodiments and modifications is generalized to derive the following technical idea.

In the toilet bowl according to the second aspect of the first invention, the three water discharge ports may include a first water discharge port having a larger discharge amount of flush water than the other two water discharge ports in the first aspect.

According to this aspect, the main flow of the flushing water is easily formed in the toilet seat by the flushing water ejected from the first water ejection port. Therefore, by adjusting the positions of the three water jet ports, the discharge direction of the flush water, and the like, it is possible to variously set the flow pattern of the main flow in the toilet seat, and it is possible to improve the degree of freedom of the flush pattern of the flush water.

In the toilet bowl according to the third aspect of the first invention, in the second aspect, the first water jet port may be provided in a rear-side divided region of the four divided regions.

In the water passage path for supplying the flush water to the first water jet, it is necessary to secure a large passage cross-sectional area in order to increase the discharge amount of the flush water from the first water jet compared to the other water jets. According to this aspect, since the first water jet opening having a large discharge amount of flush water is provided in the rear divided region, the front-rear dimension of the water passage having a large passage cross-sectional area is suppressed as compared with the case where the first water jet opening is provided in the front divided region, and the water jet portion can be easily miniaturized. Therefore, it is easy to miniaturize the entire water jet part while obtaining a good rim washing capability.

In the toilet bowl according to the fourth aspect of the first invention, in the second or third aspect, the other two water discharge ports may not be formed in the divided region adjacent to the divided region in the circumferential direction on one side of the four divided regions in which the first water discharge port is formed.

A toilet bowl according to a fifth aspect of the first invention may be configured such that, in any one of the first to fourth aspects, the rim portion has three rim water guide paths formed so as to extend from each of the three water discharge ports to one side in the circumferential direction, and the water discharge portion is configured such that a magnitude relation of discharge amounts of flush water from the three water discharge ports corresponds to a magnitude relation of inner circumferences of the three rim water guide paths connected to the three water discharge ports.

According to this aspect, a large amount of flush water can be made to flow into the rim water guide path of the inner peripheral length, and a sufficient amount of flush water can easily reach the entire rim water guide path. Further, by making a small amount of flush water flow through the edge water guide path having a short inner circumference, the amount of flush water used in the edge water guide path can be suppressed. Therefore, it is easy to suppress the amount of the washing water used for washing the entire inner peripheral surface of the rim portion while achieving a good rim washing ability by allowing a sufficient amount of the washing water to reach the entire inner peripheral surface of the rim portion.

A toilet bowl according to a sixth aspect of the first invention may be configured such that, in any one of the first to fifth aspects, the water jet unit is configured such that a magnitude relation of the discharge amount of flush water from each of the three water jets is equal to a magnitude relation of the opening area of each of the three water jets.

In the toilet bowl according to the seventh aspect of the first invention, in any one of the first to sixth aspects, the three water discharge ports may be formed independently in one circumferential divided region and in two rear divided regions out of the two front divided regions.

According to this aspect, when urine splashes into the inner peripheral surface region including the left and right center positions on the front side of the edge portion, the urine passing along the inner peripheral surface region is less likely to enter the depth side from the water spout. Therefore, the possibility of urine components remaining in the depth side of the water jet port is suppressed, and the generation of dirt and odor can be prevented accordingly.

A toilet bowl according to an eighth aspect of the first aspect of the invention may be configured such that, in any one of the first to seventh aspects, one of the three water discharge ports is provided in a circumferentially one divided region of the two front divided regions, the water discharge portion has a water passage path for supplying flush water to the one water discharge port, and the water passage path is formed so as to extend in the front-rear direction on a depth side of a side portion on a side where the circumferentially one divided region is located, of the side portions on both the left and right sides of the rim portion.

According to this aspect, the water passage can be arranged in a layout on the deep side without passing through the left and right center positions on the front side of the edge portion. Therefore, compared to the case where the water passage path is arranged so as to pass through the deep side of the left and right center positions on the front side of the edge portion, the water passage path for supplying the flush water to the one water jet can be shortened, and the flush water with strong water impact can be ejected from the one water jet. As a result, a more excellent rim washing ability can be obtained.

In the toilet bowl according to the ninth aspect of the first invention, in the eighth aspect, a folded-back portion that folds back flush water supplied from the upstream side and flows toward one water jet port is formed at a downstream end portion of the water passage path, the one water jet port is formed locally by two wall portions adjacent in the radial direction of the toilet seat, and circumferential direction end portions of the two wall portions are arranged so as to be lined up on a virtual line extending from a center point of the toilet seat.

According to this aspect, it is difficult to form the water path portions connected to the upstream end and the downstream end of the folded-back portion on the deep side with respect to one water jet port in a row in the radial direction of the toilet seat. Therefore, it is easy to design the passage path for supplying flush water to the water jet so that the portion having the smallest cross-sectional area is a single water jet.

A toilet bowl according to a tenth aspect of the first invention may be the toilet bowl according to any one of the first to ninth aspects, wherein the toilet bowl main body has a water discharge passage portion communicating with the inside of the toilet bowl seat through an inlet formed in a bottom portion of the toilet bowl seat, the three water discharge ports include a first water discharge port formed in any one divided region and a second water discharge port formed in a front divided region, and the water discharge portion is configured to merge flushing water discharged from the first water discharge port and flushing water discharged from the second water discharge port to form a main flow toward the inlet.

According to this aspect, the flush water discharged from the first water discharge port and the flush water discharged from the second water discharge port merge to form a main flow toward the inlet of the drainage passage portion. Since the second water jet is located in the front divided region, the path through which the flush water flows in the section from the second water jet to the inlet of the drain passage portion can be shortened as compared with the case where the second water jet is located in the rear divided region. As a result, the main flow of flush water discharged from the second water discharge port has strong water impact, and the main flow of flush water impacts the waste in the toilet seat into the inlet of the drain passage portion, thereby achieving excellent waste discharge performance.

In the toilet bowl according to the eleventh aspect of the first invention, in the tenth aspect, the water jet unit may have a third water jet port formed in an edge portion in a rear divided region of the two divided regions.

A toilet bowl according to a twelfth aspect of the first invention may be configured such that, in the eleventh aspect, the first water jet, the second water jet, and the third water jet are arranged in this order on one side in the circumferential direction, and the water jet unit is configured such that the total discharge amount of flush water of the first water jet and the second water jet is larger than the discharge amount of flush water of the third water jet.

According to this aspect, it is expected that the main flow is formed using the flush water amount that is half or more of the entire flush water amount used in one flush operation. Therefore, the main flow rate of the strong water impact can be increased, and the waste in the toilet seat can be flushed into the inlet of the drainage passage by the main flow of the strong water impact and the large flow rate, thereby obtaining particularly good waste discharge performance.

A toilet bowl according to a thirteenth aspect of the first invention may be configured such that, in the eleventh or twelfth aspect, the water discharge portion is configured to discharge the flush water from the first water discharge port and the third water discharge port and then discharge the flush water from the second water discharge port.

When the ratio of the main flow rate with respect to the entire rinsing water amount for one rinsing action is increased, the dirt discharge capability can be improved without increasing the entire rinsing water amount. According to this aspect, since the amount of flush water that is discharged from the second water discharge port and flows into the inlet without flowing can be reduced, the ratio of the main flow rate to the entire flush water amount can be increased. Therefore, by increasing the ratio of the main flow rate, the dirt discharge performance can be improved.

A toilet bowl according to a fourteenth aspect of the first invention may be configured such that, in any one of the tenth to thirteenth aspects, the toilet seat has four divided regions divided by a left-right center line and a front-rear center line that bisect a left-right dimension of the outer surface portion of the toilet body in a plan view, and the second water jet port is formed in a divided region located on one side in the circumferential direction of the two divided regions on the front side.

According to this aspect, the flush water discharged from the second water jet port flows to the inlet of the water discharge passage portion without passing through the inner peripheral surface region located at the center of the toilet seat having a small radius of curvature. Therefore, the water impact of the main flow formed by the flush water ejected from the second water ejection port is less likely to be weakened by the centrifugal force, and a satisfactory dirt discharge capability can be obtained as compared with a case where the second water ejection port is formed in the other divided region in the circumferential direction out of the two divided regions on the front side.

A toilet bowl according to a fifteenth aspect of the first invention may be configured such that, in any one of the tenth to fourteenth aspects, the water jet unit is configured such that flush water discharged from the first water jet and flush water discharged from the second water jet merge together on an inner peripheral surface of the toilet seat unit to form a main flow toward the inlet.

According to this aspect, the inner peripheral surface of the toilet seat can be flushed by the main stream of strong water impact, and good toilet seat flushing performance can be obtained.

In addition, the first invention embodied by the above embodiments and modifications is generalized and the invention described in the following items is also included therein.

(first item)

A toilet bowl is provided with a toilet bowl main body, and the toilet bowl main body comprises: a toilet seat, a water discharge passage part communicated with the inside of the toilet seat through an inlet formed at the bottom of the toilet seat, and a water jet part for jetting washing water into the toilet seat,

the toilet seat has: a receiving surface portion for receiving dirt, an edge portion connected to an upper edge portion of the receiving surface portion,

the water jet part has two water jet ports formed in the edge part, and jets the flush water into the toilet seat part from the two water jet ports toward one side in the circumferential direction,

the toilet seat has two divided regions divided by a front-rear center line that bisects a front-rear dimension of an inner surface portion of the toilet seat in a plan view,

the two water discharge ports include a first water discharge port formed in any one of the two divided regions and a second water discharge port formed in the front divided region,

the water jet unit is configured to cause the washing water discharged from the first water discharge port and the washing water discharged from the second water discharge port to merge and form a main flow toward the inlet.

The problems associated with the invention described in the first item are as follows.

Conventionally, various flushing methods for flushing the inside of a toilet seat of a toilet have been studied. Patent document 2 proposes a flush toilet in which a first water jet is provided in a region on one side of the rear and left and right sides of a toilet seat, and a second water jet is provided in a region on the other side of the rear and left and right sides of the toilet seat. In this toilet bowl, flush water discharged from each water jet flows into the concave portion of the toilet seat, and the water stored in the concave portion is stirred in the vertical direction. By stirring the water in the concave portion, the dirt in the concave portion is easily discharged by being sunk into the water, and the dirt discharge performance is improved.

The present inventors have studied the structure of patent document 2 and have come to recognize the following problems. The toilet disclosed in patent document 2 has a long path through which flush water flows in a section from each water jet to an inlet of a drain line. Therefore, the flush water ejected from the water ejection port reaches the recess with a relatively reduced water impact. Therefore, water impact for flushing dirt into the drain line is liable to be insufficient, and there is room for improvement in dirt discharge performance.

The present invention described in the first item has been made in view of such problems, and an object thereof is to provide a toilet bowl capable of obtaining a good waste discharge capability.

2. The preferred embodiment of the second invention will be described.

(second embodiment)

Fig. 15 is a side sectional view of a toilet bowl 300 according to a second embodiment, and fig. 16 is a plan view of the toilet bowl 300. Fig. 17 is a top surface view of toilet bowl 300 taken at the horizontal plane along line a-a of fig. 15.

Hereinafter, as shown in fig. 16, the left-right direction of the toilet bowl 300 is defined as an X-axis, the front-back direction of the toilet bowl 300 is defined as a Y-axis, and the height direction is defined as a Z-axis. The positive X-axis direction is referred to as the "right direction", and the negative X-axis direction is referred to as the "left direction". The left-right direction is defined as a first direction, and the other direction is defined as a second direction. In the embodiment, the left direction is defined as a first direction, and the right direction is defined as a second direction.

(Water closet)

The toilet bowl 300 includes a bowl main body 302 made of ceramic. The toilet body 302 is a wall-mounted toilet that is mounted in a state of being hung on the wall surface 210 of the toilet. Although not shown, a tank for housing the device for flushing isothermal water of the local flushing device, a toilet lid and a toilet seat supported by the tank so as to be vertically rotatable are disposed above the toilet main body 302.

(toilet seat main body)

The toilet body 302 includes a toilet seat 310, a drain pipe 312, and a peripheral wall 314. The drain pipe portion 312 is formed at a lower portion of the toilet seat 310. The peripheral wall portion 314 covers the internal structures such as the toilet seat portion 310 and the drain pipe portion 312.

The drain pipe portion 312 forms a U-shaped water seal portion 316e at a connection portion with the toilet seat 310. The water seal portion 316e always retains water, and blocks the odor in the drainage pipe portion 312. The dirt that has fallen into the water seal portion 316e is flushed out to the outside by the flush water together with the retained water.

(toilet seat)

The toilet seat 310 is formed in an oval shape having a front-rear dimension larger than a left-right dimension in a plan view. The toilet seat 310 includes: a bowl-shaped receiving face portion 330 for receiving dirt; a rim portion 308 connected to an upper rim portion of the receiving surface portion 330 and forming an upper rim portion of the toilet seat 310; a recess 316 formed to be recessed downward from a lower edge portion of the receiving surface portion 330. The receiving surface portion 330 is formed to be inclined downward toward the center side. The recess 316 is formed in a bottomed shape, and an inlet of the water seal portion 316e is opened to a bottom 316k of the recess 316. A part of the retained water is accumulated in the recess 316. The recess 316 will be described later.

Fig. 19 is a diagram illustrating the central axis M1 of the recess 316 and the shape of the recess 316. The recess 316 has a tip portion 316f corresponding to a vertex shared by the left and right sides in a plan view. A straight line that bisects the left-right range Lx of the concave portion 316 and extends in the front-rear direction is denoted as a central axis M1. A straight line passing through the front end portion 316f and extending in the left-right direction is denoted as a straight line N1. The intersection of the central axis M1 and the straight line N1 is denoted as point P. Left end 220a is located on left upright wall 220 of recess 316, and right end 222a is located on right upright wall 222. In fig. 19, the front end portion 316f is located at the center axis M1.

The toilet seat 310 has four divisional regions Sr1 to Sr4 divided by a central axis M1 and a straight line N1 in a plan view. Hereinafter, of the four divided regions, a divided region on the rear side with respect to the straight line N1 and on the left side with respect to the central axis M1 is referred to as a first divided region Sr1, and a divided region on the right side is referred to as a fourth divided region Sr 4. A front side of the straight line N1 and a left side of the central axis M1 are defined as a second divided region Sr2, and a right side divided region is defined as a third divided region Sr 3.

(edge water guide path)

As shown in fig. 17, three water guide paths, i.e., a first edge water guide path 324a mainly provided on the left side, a second edge water guide path 324b mainly provided on the right side, and a third edge water guide path 324c mainly provided on the left rear side, are formed in the edge portion 308. The three water guide paths, i.e., the first edge water guide path 324a, the second edge water guide path 324b, and the third edge water guide path 324c, are collectively referred to as a "water guide path 324".

(Water spout)

Three water discharge ports, i.e., a first water discharge port 322a, a second water discharge port 322b, and a third water discharge port 322c, are formed in the edge portion 308. The three water jet ports, i.e., the first water jet port 322a, the second water jet port 322b, and the third water jet port 322c, are collectively referred to as "water jet port 322". The water jet 322 will be described later. The water jet port 322 is formed in the water passage 324 and opens to the edge water passage 320 so as to be continuous with the edge water passage 320 described later.

The first water jet 322a is disposed at the downstream end of the first edge water guiding path 324a, the second water jet 322b is disposed at the downstream end of the second edge water guiding path 324b, and the third water jet 322c is disposed at the downstream end of the third edge water guiding path 324 c.

As shown in fig. 15, flush water supplied from a water supply pipe 304 as a part of the flush water supply device is supplied to each of the rim water guide paths 324 through an inflow path 238a and a water guide path 238 b. The washing water supplied to the rim water guide passage 324 is jetted from the water jet port 322 toward the rim water passage 320 described later. The jetted washing water is rotated in the circumferential direction along the edge water passage 320. Hereinafter, the direction in which the washing water rotates in the circumferential direction is abbreviated as "rotating direction".

(edge water path)

The rim portion 308 is formed with a first rim water passage 320a, a second rim water passage 320b, and a third rim water passage 320c which are formed to extend from the respective three water discharge ports 322 in the circumferential direction of the toilet seat 310. The three edge

water passage paths

320a, 320b, and 320c are collectively referred to as an "edge water passage path 320".

The first edge water passage 320a extends circumferentially from the first water jet 322a to the downstream side in the rotation direction to the vicinity of the second water jet 322 b. The second rim water passage 320b extends circumferentially from the second water jet 322b to the downstream side in the rotation direction to the vicinity of the third water jet 322 c. The third edge water passage 320c extends from the third water jet 322c to the downstream side in the rotation direction in the circumferential direction to the vicinity of the first water jet 322 a. The first edge passage path 320a, the second edge passage path 320b, and a part of the third edge passage path 320c may be connected.

The rim water passage 320 is formed to rotate the washing water discharged from the water discharge port 322. As shown in fig. 15 and 17, the rim water passage path 320 includes a shelf portion 326b extending outward of the toilet seat portion 310 from an upper edge 326c of the receiving surface portion 330, a side wall portion 326a rising from an outer peripheral end portion of the shelf portion 326b, an overhang portion 318 extending inward of the toilet seat portion 310 from an upper end portion of the side wall portion 326a, and a redirecting portion 332 for redirecting a part of the flow of the flush water inward. The direction changing unit 332 will be described later.

As shown in fig. 17, the radial width of each shelf portion 326b in the peripheral water passage 320 is formed to decrease toward the downstream side. With this configuration, the flush water discharged from the water discharge port 322 gradually falls down to the receiving surface portion 330 as it flows downstream.

(overhanging part)

An inner edge 318a of the overhang 318 is formed at the upper end of the toilet seat 310 in such a manner as to protrude inward. The upper surface of the overhang 318 is flattened so as to become a bearing surface of the toilet seat. An edge water passage path 320, which becomes a passage for the rotating water current, is formed at the lower surface of the overhang 318.

(shape of concave part)

Next, the shape of the recess in plan view will be described.

From the viewpoint of efficiently washing the vertical wall of the recess with a small amount of washing water, it is more advantageous that the area of the vertical wall to be washed is smaller. Since the area of the standing wall is determined in accordance with the length of the peripheral outline of the recess and the height dimension of the standing wall in plan view, the area of the standing wall can be reduced by reducing the length of the peripheral outline of the recess. I.e. a smaller length of the peripheral contour of the recess, is advantageous in the sense that the recess is effectively flushed.

In order to smoothly discharge the dirt, it is preferable that the left-right dimension and the front-rear dimension of the recess be equal to or larger than a predetermined dimension. The shape of the recess in a plan view may be a rectangle or an ellipse, a combination of these shapes, and a modified shape thereof. As a result of the study, it was found that when the lateral dimension and the front-rear dimension are constant, the length of the peripheral outline of the recess is shorter in the case where the recess is triangular in plan view than in the case where the recess is rectangular or elliptical. Therefore, from the viewpoint of efficiently flushing the standing wall of the recess, it is advantageous that the peripheral contour of the recess is triangular.

The recessed portion of the toilet seat having a substantially triangular shape means that each side constituting the triangular shape is formed of a curved line or a straight line having a curvature radius of 100mm or more in a plan view. As a result, the angles of the three corner portions can be formed to acute angles of 90 degrees or less in a plan view.

From the above-described viewpoint, the shape of the recess 316 of the toilet bowl 300 of the embodiment will be described. Fig. 20 is a plan view showing an enlarged inner edge of the recess 316. The recess 316 has a substantially triangular shape defined by three vertical walls corresponding to three sides of the triangle 230 having the base 230u located rearward of the left and

right sides

230h, 230m in plan view. The left standing wall 220 and the right standing wall 222 correspond to the left and right side edges 230h, 230m, and the rear standing wall 224 corresponds to the bottom edge 230 u. The three standing walls, i.e., the left standing wall 220, the right standing wall 222, and the rear standing wall 224, are collectively referred to as "standing walls 226".

The recess 316 has: a front end 316f corresponding to a vertex 230a common to the left and

right sides

230h, 230 m; a left corner 316h corresponding to the left rear vertex 230 c; right corner 316m corresponding to vertex 230b of the right rear. In particular, three corners including the tip portion 316f, the left corner 316h, and the right corner 316m pass through three vertices of the triangle 230. The three corners of the front end 316f, the left corner 316h, and the right corner 316m are collectively referred to as "corner 228".

When the radius of curvature of the leading end 316f is too large, the water area in the recess 316 may rotate without being lowered, and in this case, the downward water flow may not be sufficiently formed, and the discharge performance may be lowered. When the radius of curvature of the front end portion 316f is too small, the mold-releasing operation for separating the material injected into the mold from the mold may become difficult.

The water flow falling down to each standing wall of the recess flows along the standing wall and collides with the corner of the recess, thereby efficiently washing the corner. Therefore, when the radius of curvature of the standing wall of the recess is too small, the water impact that hits the corner of the recess is reduced, and a flush omission may occur at the corner of the recess. From this viewpoint, the recessed portion 316 is formed in a curved line or a straight line having a radius of curvature of 100mm or more in the left standing wall 220, the right standing wall 222, and the rear standing wall 224. Further, when the standing wall of the recess is a convex surface protruding inward in a plan view, the water flow along the standing wall is less likely to collide with the corner portion. From this viewpoint, the concave portion 316 is formed as a concave surface bulging outward in a plan view.

In the recess 316, the radius of curvature of the left standing wall 220, the right standing wall 222, and the rear standing wall 224 is larger than the radius of curvature of the front end 316 f.

(arrangement of Water spout)

Next, the arrangement of the water ejection ports is explained.

In the case of three water jet ports, from the viewpoint of efficiently flushing the interior of the toilet seat with a small amount of flushing water, the flushing water discharged from the three water jet ports spreads over a wide range in the toilet seat, and is more advantageous than the case where the flushing water is concentrated in a narrow range. To make the respective washing waters spread widely, it is preferable that three water jets are arranged at equal intervals around the recess. From the foregoing point of view, the effective structure is as follows: the interval between the three water jets is in the range of one-fourth of the circumference length or more and one-half of the circumference length or less in the circumferential direction around the point P as the center.

In the toilet bowl 300 of the embodiment, the three water jet ports 322 are formed independently in each of three divisional regions of the four divisional regions Sr1 to Sr 4. For example, the first water jet 322a may be disposed in the first divisional area Sr1, the second water jet 322b may be disposed in the third divisional area Sr3, and the third water jet 322c may be disposed in the fourth divisional area Sr 4. According to another example, one of first water jet 322a and second water jet 322b may be disposed in second divisional region Sr 2. With this configuration, the three water jet ports 322 can be arranged at intervals ranging from a quarter of the circumference to a half of the circumference.

In particular, in toilet bowl 300, in a plan view, three water jet ports 322 include first water jet port 322a formed on the left side of recess 316, second water jet port 322b formed in front of recess 316, and third water jet port 322c formed on the right side of recess 316 and behind rear upright wall 224.

In toilet bowl 300, front end 316f of recess 316 is located in a triangle connecting three water discharge ports 322 in a plan view. The second water jet port 322b is located within the left-right range Lx of the recess 316, and the third water jet port 322c is located outside the left-right range Lx of the recess 316. By so arranging that the three water jet ports 322 surround the recess 316 in the circumferential direction, the washing water can efficiently wash the recess 316.

From the viewpoint of efficiently washing the three standing walls of the recess, it is preferable that the three water jet ports jet washing water corresponding to the respective standing walls. In the toilet bowl 300 of the present embodiment, the three water discharge ports discharge water corresponding to the next vertical wall of the vertical wall closest to each water discharge port in the flow direction of the washing water. That is, in toilet bowl 300, first water jet 322a is provided corresponding to right standing wall 222, second water jet 322b is provided corresponding to rear standing wall 224, and third water jet 322c is provided corresponding to left standing wall 220.

As will be described later with reference to fig. 21, the first main flow 362 of the first water jet 322a drops to the right standing wall 222, the first main flow 372 of the second water jet 322b drops to the rear standing wall 224, and the first main flow 382 of the third water jet 322c drops to the left standing wall 220. The first

main flows

362, 372, 382 are configured to flow on the receiving surface portion 330 by approximately one-half of the circumference and fall down to the recess 316.

(Water flow)

Next, the flow of the washing water is described with reference to fig. 21. Fig. 21 is a view schematically showing a flow pattern of washing water in the toilet seat 310. As described above, the washing water supplied from the water supply pipe 304 is supplied to the three edge water guide paths 324 through the water guide path 238 b. The washing water 358, 368, 378 supplied to the rim water guide path 324 is ejected from the water ejection port 322 to the rim water passage path 320, and forms first

main flows

362, 372, 382 bent inward from the rim water passage path 320 and second main flows 364, 374, 384 rotating along the rim water passage path 320. The main stream of the washing water means a main stream in which most of the washing water flows in the same manner, and a water jet of one water jet may form a plurality of main streams.

(turning part)

Here, the flow of the flush water is affected by the shape of the rim portion 308 and the shape of the toilet seat 310, and therefore, the first main flow and the second main flow which are expected are not easily formed. First, the direction changing portion 332 that controls the first main flow and the second main flow will be described with reference to fig. 17 and 18.

In the peripheral water passage 320, a side wall portion 326a curved in an arc shape in a plan view is formed so as to surround the recess portion 316. By the bending action of the side wall portion 326a, a water flow that is bent along the side wall portion 326a and rotates in the circumferential direction is formed in the flush water.

In the toilet bowl 300, the direction changing portion 332, which bends a part of the flow of flush water that rotates in the circumferential direction along the side wall portion 326a, is provided in the side wall portion 326a of the rim water passage 320. The turning portion 332 causes a part of the flow of the washing water to be bent inward independently of the bending action of the side wall portion 326 a. By providing the diverter 332, the direction change position of the main flow is determined, and the flow of the flush water is changed, so that the first main flow and the second main flow can be controlled densely.

As shown in fig. 17, the direction-changing portion 332 includes a first convex portion 334a, a second convex portion 334b, and a third convex portion 334c, which are formed by projecting a portion of the side wall portion 326a inward from both sides in the circumferential direction. The first convex surface portion 334a, the second convex surface portion 334b, and the third convex surface portion 334c are collectively referred to as "convex surface portion 334". The convex portion 334 is provided on the edge water passage 320 on the downstream side of the water jet 322.

First raised surface portion 334a is disposed adjacent first water jet 322a between first water jet 322a and second water jet 322 b. Second raised surface portion 334b is disposed adjacent second water jet 322b between second water jet 322b and third water jet 322 c. Third raised surface portion 334c is disposed adjacent third water jet 322c between third water jet 322c and first water jet 322 a.

Fig. 18 is a schematic diagram showing the periphery of the first convex surface portion 334a in an enlarged manner. For comparison, the outline 354a of the sidewall portion without the convex portion is shown by a broken line. The first convex surface portion 334a forms a leading portion 334as, a convex portion 334at, and a downstream portion 334au in this order from the upstream side. The convex portion 334at is a portion projecting inward from the pilot portion 334as and the downstream portion 334au on both sides thereof.

The washing water sprayed from the first water spray 322a forms a first water flow 360. The outer water flow 360s of the first water flow 360 collides with the pilot portion 334as and flows inward along the pilot portion 334 as. The water flow 360u in the inner portion of the first water flow 360 passes through the convex portion 334at without colliding with the leading portion 334as, and flows rotationally in the circumferential direction along the downstream portion 334au and the side wall portion 326a connected to the downstream side thereof. In fig. 18, for ease of understanding, the water flow 360s and the water flow 360u are depicted as intersecting the water flow 360u, while the water flow 360s and the water flow 360u are affected by each other while forming the desired first main flow 362 and second main flow 374.

In this way, the first convex surface portion 334a can form the water flow 360s that rotates from the first water flow 360 and the water flow 360u that curves inward from the rotating water flow 360 s. By adjusting the shape of the first convex surface portion 334a, a desired amount, water impact, and direction are given to the water flow 360s and the water flow 360u, and the first main flow 362 and the second main flow 374 can be generated as desired. The shape and the function of the second convex surface portion 334b and the third convex surface portion 334c are the same as those in fig. 18 and the description of the first convex surface portion 334a, and redundant description is omitted.

As described above, by providing the redirecting portion 332, the flow of the washing water can be controlled densely. In particular, since the direction change position of the main flow can be specified, the shape of the shelf portion 326b of the rim portion 308 and the shape of the toilet seat 310 are not easily affected, and a desired flow of flush water is easily formed.

Returning to fig. 21. The first main flow 362 falls toward the right vertical wall 222 while widely flushing the receiving surface portion 330, flows along the right vertical wall 222, and collides with the right corner portion 316 m. The colliding first main flow 362 forms a downward water flow 362a and a directional water flow, and changes the direction in the recess 316 to form a lateral water flow flowing along the rear standing wall 224. The first main flow 362 flowing along the rear standing wall 224 merges with a first main flow 372 described later to form a swirl 388 that rotates laterally in the counterclockwise direction. The water falling toward the right standing wall 222 may include a part of the water sprayed from the other water spray nozzles.

The first main flow 362 effectively flushes the wall surface thereof by flowing along the right vertical wall 222. The first main flow 362 effectively washes the right corner 316m by striking the corner. The first main flow 362 effectively flushes the walls thereof by flowing along the rear upstanding wall 224. The first main flow 362 promotes the discharge of the filth from the water seal portion 316e to the drain pipe portion 312 by forming a downward water flow 362 a.

The washing water 368 supplied to the second rim water guide passage 324b is ejected from the second water jet port 322b to the second rim water guide passage 320b to form a second water flow 370. The second water flow 370 forms a first main flow 372 curved inward from the second edge flow path 320b and a second main flow 374 swirling along the second edge flow path 320 b.

The first main flow 372 falls toward the rear standing wall 224 while widely flushing the receiving face portion 330, flows along the rear standing wall 224, and collides with the left corner portion 316 h. The colliding first main flow 372 forms a downward flow 372a and an upward flow, and changes its orientation in the counterclockwise direction in the recess 316 to form a lateral flow flowing along the left standing wall 220. The first main flow 372 flowing along the left standing wall 220 merges with a first main flow 382 described later to form a swirl 388 that rotates laterally in the counterclockwise direction. The water falling toward the rear standing wall 224 may include water sprayed from some other water spray nozzles.

The first main flow 372 effectively flushes the walls thereof by flowing along the rear upstanding wall 224. The first main flow 372 effectively washes the corner portions thereof by colliding against the left corner portion 316 h. The first main flow 372 effectively flushes the walls thereof by flowing along the left vertical wall 220. The first main flow 372 forms a downward water flow 372a to make a vertical rotation in the swirl 388, thereby promoting discharge of the filth from the water seal portion 316e to the drain pipe portion 312.

The washing water 378 supplied to the third edge water guide path 324c is jetted from the third water jet port 322c to the third edge water passage path 320c to form a third water flow 380. The third water flow 380 forms a first main flow 382 bent inward from the third edge water passage 320c, and a second main flow 384 swirling along the third edge water passage 320 c.

The first main flow 382 falls toward the left standing wall 220 while widely washing the receiving surface portion 330, flows along the left standing wall 220, and collides with the leading end portion 316 f. The colliding first main flow 382 forms a downward flow 382a and an upward flow, and changes its orientation in the counterclockwise direction within the recess 316 to form a lateral flow flowing along the right standing wall 222. The first main flow 382 flowing along the right standing wall 222 merges with the first main flow 362 to form a swirl 388 that rotates laterally in the counterclockwise direction. The water falling toward the left standing wall 220 may include water sprayed from some other water spray nozzles.

The first main flow 382 effectively flushes its walls by flowing along the left vertical wall 220. The first main flow 382 effectively flushes its corners by impacting the front end portion 316 f. The first main flow 382 effectively flushes its walls by flowing along the right vertical wall 222. The first main flow 382 forms a downward water flow 382a to form a vertical rotation in the swirl 388, thereby promoting discharge of the filth from the water seal portion 316e to the drain pipe portion 312.

The first main flow 362, the first main flow 372, and the first main flow 382 form a vortex 388, thereby strongly concentrating the filth to the center of the water seal portion 316e and discharging the filth from the drain pipe portion 312 (see also fig. 15). Further, the first main flow 362, the first main flow 372, and the first main flow 382 flow downward through the left standing wall 220, the right standing wall 222, and the rear standing wall 224, and form vertical rotation in the swirl 388, thereby promoting discharge of the filth from the water seal portion 316e to the drain pipe portion 312.

Reference is also made to fig. 22. Fig. 22 is a diagram schematically showing a main range of flow of washing water in the toilet seat 310. The second main flow 364 rotates along the first edge flow path 320a and overlaps the second water flow 370 discharged from the second water jet 322 b. The second main flow 374 rotates along the second edge flow path 320b and overlaps the third flow 380 from the third water jet 322 c. The second main flow 384 rotates along the third edge flow path 320c and overlaps the first water flow 360 from the first water jet 322 a.

As shown in fig. 17, since the radial width of the shelf portion 326b of the rim water passage 320 is formed so as to be gradually narrowed toward the rotational direction, the second main flows 364, 374, 384 (see also fig. 21) gradually fall down to the receiving surface portion 330 while rotating, and sheet-like falling water flows 390, 392, 394 are formed toward the recess 316. The falling

water streams

390, 392, 394 broadly flush the receiving face 330 while the surface of the receiving face 330 flows in a film-like manner.

In fig. 22, the falling

water streams

390, 392, 394 and the first water streams 362, 372, 382 are shown separately, and the falling

water streams

390, 392, 394 further contain part of the washing water branched from the first

main streams

362, 372, 382.

As shown in fig. 22, the falling water stream 390 forms an area 396 overlapping the falling water stream 392, the falling water stream 392 forms an area 398 overlapping the falling water stream 394, and the falling water stream 394 forms an area 400 overlapping the falling water stream 390. For example, a water flow that rises in a rib shape and runs down the receiving surface portion 330 is formed in the overlapped region 400.

As described above, the shape of the toilet seat 310 is configured as follows: the flushing water from the three water jets 322 forms such first

main streams

362, 372, 382, respectively. The first

main flow

362, 372, 382 is a flow of water that falls down toward the three standing

walls

220, 222, 224 and flows along the standing

walls

220, 222, 224. In addition, as described above, the shape of the toilet seat 310 is formed as follows: such first

main flows

362, 372, 382 merge in the region of the recess 316 (inside the recess 316).

Further, the shape of the toilet seat 310 is configured as follows: the flushing water from the three water jets 322 forms such second main streams 364, 374, 384, respectively. Such second main flows 364, 374, 384 flow along the inner peripheral surface of the rim portion 308, and overlap with the flush water ejected from the other water ejection ports 322 adjacent to each of the three water ejection ports 322 in the rotational direction (counterclockwise direction in the drawing).

In addition to the above configuration, the shape of the toilet seat 310 includes the shape of the rim portion 308, the receiving surface portion 330, the recess 316, and the water discharge ports 322. The shapes of the edge portion 308, the receiving surface portion 330, and the recess portion 316 include, for example, the curvature and the gradient described above. By configuring these shapes in such a manner as to satisfy these conditions, the flow pattern of water in the toilet seat 310 is mainly adjusted. The shape of each water jet 322 may be, for example, the position, size, and orientation described above. By configuring these shapes so as to satisfy the above-described conditions, the discharge direction and discharge amount of the washing water are mainly adjusted.

Next, the operation of the toilet bowl 300 will be described.

The toilet bowl 300 supplies a predetermined amount of washing water from the water supply pipe 304 to the water conduit path 324 through the inflow path 238a and the water conduit path 238b by operation of a predetermined switch, lever, or other operation member. The supplied flush water is discharged from the water discharge port 322 toward the water passage 320, and the waste in the toilet seat 310 is flushed into the water seal portion 316e below the recess 316 by the water head difference of the flush water, and the toilet seat 310 is widely flushed.

Next, features of the toilet bowl 300 of the present embodiment will be described.

The first

main flows

362, 372, 374 of the respective flushing water ejected from the water ejection port 322 flow along the wall surface of the standing wall 226 of the recess 316, and the dirt attached to the wall surface can be washed away strongly. The first main flow flows toward each corner 228 (see also fig. 20), and collides with a wall surface of the corner 228 to be dispersed mainly in the lateral rotation direction, the lower direction, and the upper direction. Since the corner 228 is at an acute angle, the water flow in the lateral direction is suppressed, and the water flow in the upward direction is also suppressed by gravity and the first main flow from the upper part of the toilet bowl to the lower part, and accordingly, the strong water flow in the downward direction is formed.

These downward strong water flows are formed from three directions corresponding to the respective corner portions 228 together with the water flow of the swirl 388, and the dirt is strongly washed from the water seal portion 316e to the drain pipe portion 312.

In addition, the range from the rim portion 308 to the receiving surface portion 330 can be widely flushed by the second main flow, and the entire toilet seat 310 can be flushed.

For example, in a configuration in which the recess is circular or polygonal with four or more sides, a strong horizontal swirling vortex can be formed in the recess, but the downward water flow becomes weak, which is disadvantageous in discharging dirt. In contrast, in the toilet bowl 300, the recess 316 is defined by three vertical walls corresponding to each side of the triangle, and therefore, the downward water flow can be enhanced to effectively discharge the filth. In addition, the cross-swirling water flow can be reduced to suppress the swirl 388.

When the three water jet ports are concentrated on one side, the unevenness of the water flow becomes large and an insufficient washing area is generated in the toilet seat. In contrast, since the toilet bowl 300 has three water discharge ports 322 spaced in a range of not less than one-fourth of the circumference length and not more than one-half of the circumference length, unevenness in water flow is suppressed, and a good flushing performance can be obtained.

When the three water jets are arranged non-uniformly with respect to the recess, unevenness occurs in the washing force of the vertical wall of the recess. On the other hand, in toilet bowl 300, since first water jet port 322a is provided on the left side of concave portion 316, second water jet port 322b is provided in front of concave portion 316, and third water jet port 322c is provided in the rear of concave portion 316 so as to surround concave portion 316, variation in flushing force of the standing wall of concave portion 316 can be suppressed.

In the configuration in which only the main flow of the washing water falling while rotating is formed, it is considered that the washing force against the standing wall of the recess is reduced because the impact of the water when falling into the recess is reduced. In contrast, in toilet bowl 300, water jet port 322 jets out first

main flows

362, 372, and 382 that fall toward upright wall 226 and flow along upright wall 226, respectively, and therefore, water hammering down is suppressed and upright wall 226 can be efficiently flushed.

It is considered that the first

main flows

362, 372, 382 ejected from the water ejection port 322 mainly join the receiving surface portion 330, and influence the impact and direction of water when falling down to the recess 316. On the other hand, in the toilet bowl 300, the first main flow 362 and the first main flow 382 join in the region of the recess 316, the first main flow 382 and the first main flow 372 join in the region of the recess 316, and the first main flow 372 and the first main flow 362 join in the region of the recess 316, so that the impact on the water impact and the direction when the water drops into the recess 316 are suppressed.

By the confluence of the first

main flows

362, 372, 382, a stronger horizontal vortex and downward water flow can be formed, and dirt can be washed out strongly.

At the boundary portion of the main flow of each of the washing waters discharged from the three water discharge ports, the washing water may not sufficiently flow, and the washing power may be insufficient. On the other hand, in the toilet bowl 300, the second main streams 364, 374, 384 flow in the circumferential direction along the side wall portion 326a of the edge water passage 320 and overlap with the flush water ejected from the rotation direction side water jet ports 322 of the three water jet ports 322, so that the shortage of water flow at the boundary portion of the main streams is suppressed, and the toilet seat 310 can be widely and satisfactorily flushed.

When the overall shape of the toilet seat is changed to achieve a desired flow of flush water, other performance may be impaired, which may cause a restriction to achieve the desired flow. On the other hand, in the toilet bowl 300, since the diversion portion 332 for deflecting a part of the flow of the flush water inward is provided in the rim water passage 320, the flow of the flush water can be changed to approach a desired flow by providing the diversion portion 332 independently of the bending action of the side wall portion 326 a.

In the toilet bowl 300, since the direction changing portion 332 has the convex portions 334 in which a part of the side wall portion 326a protrudes inward on both sides in the circumferential direction, it is possible to minimize the change in the shape of the shelf portion 326b and the toilet seat portion 310.

The second invention has been described above with reference to the embodiments. These embodiments are illustrative, and those skilled in the art will understand that various modifications and changes can be made within the scope of the claims of the second invention, and that these modifications and changes are also included in the scope of the claims of the second invention. Therefore, the description and drawings in this specification are not limitative, but should be interpreted as illustrative.

Although the flush toilet 300 has been described as using the direct flush type as an example of the flush method, the inside of the toilet seat 310 may be flushed by a flush method combined with another method such as the siphon type or the siphon jet type. The toilet bowl 300 has been described as an example of a water supply system using a direct pressure type of tap water, and a gravity water supply system using gravity, a flush valve type, or the like may be used. The toilet body 302 is described by taking a wall-mounted toilet as an example, but may be a floor-mounted toilet that is installed on the floor of a toilet. The toilet body 302 may be made of a material such as resin, in addition to ceramics.

In the embodiment of the second invention, an example in which the water jet generates the swirling water flow in the counterclockwise direction is described, but the invention is not limited thereto. For example, the water flow may be reversed left and right to generate a clockwise water flow.

In the embodiment of the second invention, the example in which the number of the water ejection ports provided in the edge portion is three has been described, but other water ejection members may be provided in addition to the three water ejection ports in an auxiliary manner.

Description of the reference numerals

A 10 … toilet, a 12 … toilet body, a 14 … toilet seat, a 16 … inlet, a 20 … drain passage portion, a 26 … receiving face portion, a 28 … edge portion, a 28L … left side portion, a 28R … right side portion, a 32a … first water jet, a 32B … second water jet, a 32C … third water jet, a 36 … water jet portion, a 38B … right side water passage path (first water passage), a 38C … left side water passage (second water passage), Sr1 to Sr4 … divided regions, La … left and right center lines, and Lb … front and rear center lines.

210 … wall, 220 … left standing wall, 222 … right standing wall, 224 … rear standing wall, 226 … standing wall, 228 … corner, 230 … triangle, 300 … toilet, 302 … toilet body, 308 … rim, 310 … toilet seat, 316 … recess, 322 … water jet, 330 … receiving face, 332 … diversion, 334 … convex face.

Industrial applicability

The present invention relates to toilets.

Claims

1. A toilet bowl is provided with a toilet bowl main body, and the toilet bowl main body comprises: a toilet seat; and a water jet part for jetting washing water into the toilet seat,

the toilet seat has: a receiving face portion for receiving dirt; and an edge portion connected to an upper edge portion of the receiving face portion,

the water jet part has three water jet ports formed in the edge part, and jets out flush water from the three water jet ports along the inner peripheral surface of the edge part to one side in the circumferential direction,

the toilet seat has four divided regions divided by a left and right center line bisecting the left and right dimensions of the outer surface portion of the toilet main body and a front and rear center line bisecting the front and rear dimensions of the inner surface portion of the toilet seat in a plan view,

the three water discharge ports are respectively and independently formed in three divided regions among the four divided regions,

the water jet part has a hollow water passage part which is arranged on the longitudinal side of the edge part and supplies washing water to the three water jet ports,

the edge portion includes an edge water guide path having a frame portion formed so as to extend from each of the three water discharge ports to one side in the circumferential direction,

the three water jet ports include a first water jet port having a greater discharge amount of washing water than the other two water jet ports,

among the four divided regions, the divided region adjacent to the divided region in which the first water jet is formed on one side in the circumferential direction is not formed with the other two water jets.

2. The water closet of claim 1,

the first water jet is arranged in the rear divided area of the four divided areas.

3. The water closet according to claim 1 or 2,

the edge portion has three edge water guide paths formed to extend from each of the three water discharge ports to one side in the circumferential direction,

the water jet unit is configured such that the magnitude relation of the discharge amount of each of the three water jets is the same as the magnitude relation of the inner circumferences of the three edge water guide paths connected to the respective three water jets.

4. The water closet according to claim 1 or 2,

the water discharge portion is configured such that the magnitude relation between the discharge amounts of the flushing water from the three water discharge ports is the same as the magnitude relation between the discharge amounts of the flushing water from the three water discharge ports and the opening areas of the three water discharge ports.

5. The water closet according to claim 1 or 2,

the three water discharge ports are formed independently in a divided region on one side in the circumferential direction and in the divided regions on both rear sides among the divided regions on both front sides.

6. The water closet according to claim 1 or 2,

one of the three water discharge ports is formed in a divided region on one side in the circumferential direction among the divided regions on the two front sides,

the water jet part has a water passage for supplying flush water to the one water jet,

the water passage path is formed to extend in the front-rear direction on the depth side of the side portion on the side where the divided region is located at one side in the circumferential direction, among the side portions on both the left and right sides of the edge portion.

7. The water closet of claim 6,

a folded-back portion that folds back flush water supplied from an upstream side and guides the flush water to the one water jet is formed at a downstream end portion of the water passage path,

the one water jet is formed partially by two wall portions of the toilet seat which are adjacent in the radial direction,

the circumferential ends of the two wall portions are arranged to be aligned on a virtual line extending from a center point of the toilet seat.

8. The water closet according to claim 1 or 2,

the toilet body has a drain passage portion communicating with the inside of the toilet seat through an inlet formed at the bottom of the toilet seat,

the three water jet nozzles comprise a first water jet nozzle formed in any dividing area and a second water jet nozzle formed in the dividing area at the front side,

the water jet unit is configured to merge wash water discharged from the first water jet and wash water discharged from the second water jet to form a main flow toward the inlet.

9. The water closet of claim 8,

the three water discharge ports include a third water discharge port formed in a divided region on the rear side.

10. The water closet of claim 9,

the first water jet, the second water jet and the third water jet are arranged in this order on one side in the circumferential direction,

the water jet unit is configured such that the total amount of the jet amount of the cleaning water from the first water jet and the second water jet is larger than the jet amount of the cleaning water from the third water jet.

11. The water closet according to claim 9 or 10,

the water discharge unit is configured to discharge the cleaning water from the second water discharge port after the cleaning water is discharged from the first water discharge port and the third water discharge port.

12. The water closet of claim 8,

the second water jet is formed in a divided region on one side in the circumferential direction among the divided regions on both front sides.

13. The water closet of claim 8,

the water jet unit is configured such that the flush water jetted from the first water jet and the flush water jetted from the second water jet merge together on the inner peripheral surface of the toilet seat to form a main flow toward the inlet.