JP7117141B2 - flush toilet - Google Patents

Description

The present invention relates to flush toilets.

BACKGROUND ART Conventionally, various studies have been made on cleaning methods for discharging contaminants. In Patent Document 1, a swirling flow directed backward is formed in the lateral regions on the left and right sides of the toilet bowl, and a part of the swirling flow flows into the water storage portion of the toilet bowl from behind, thereby draining the toilet bowl. A flush toilet is disclosed that is capable of creating an induced flow to force waste into the passageway.

JP 2016-89431 A

Consider a case in which a water flow is caused to flow into the water reservoir of the toilet bowl from behind, thereby forming an induction flow that pushes waste into the toilet bowl drainage channel. In this case, it is desirable to increase the inflow amount of the swirling flow from the rear of the pooled water portion in order to obtain a good dirt discharge capability. Based on this point of view, the inventors of the present invention have found that there is a new measure for improving the ability to discharge filth.

An aspect of the present invention has been made in view of such problems, and one of the objects thereof is a technology capable of improving the ability to discharge filth by using the water flow that flows into the water reservoir from the rear to discharge filth. is to provide

A first aspect of the present invention for solving the aforementioned problems is a flush toilet. The flush toilet of the first aspect is a flush toilet provided with a toilet bowl body, the toilet bowl body having a bowl-shaped waste receiving surface and a pooled water portion recessed downward from the lower edge of the waste receiving surface. a toilet bowl portion connected to the bottom portion of the toilet bowl portion; a first water discharging portion forming a first swirling flow directed rearward in a first lateral region on one of the left and right sides of the water-retaining portion; The toilet bowl part is configured to form a guided flow that pushes waste into the toilet drainage channel by a water flow that flows into the water storage part from behind while coming into contact with the toilet bowl part behind the front end of the water storage part. A guide surface is formed on the inner peripheral surface of the toilet bowl in the first lateral region and can guide the first swirl flow that has collided with itself to the rear.

According to the first aspect, the collision with the guide surface can decelerate the first swirling flow. Along with this, the flow rate of the water flow passing through the filth receiving surface behind the water storage portion is reduced without flowing into the water storage portion from behind, and the water flows into the water storage portion from behind while contacting the standing wall surface of the water storage portion. It can increase the flow rate of water flow. Therefore, it is possible to increase the flow rate of the induced flow that pushes waste into the toilet drainage channel, thereby improving the waste discharge capacity.

It is a side cross-sectional view of the flush toilet bowl of the first embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; 2 is an enlarged view of FIG. 1; FIG. FIG. 2 is a cross-sectional view taken along line BB of FIG. 1; It is a side sectional view showing a part of toilet body of a reference example. It is a figure which shows how an object flows in the toilet bowl main body of a reference example. It is a figure which shows how an object flows in the toilet body of 1st Embodiment. 1 is a configuration diagram of a flush toilet bowl of a first embodiment; FIG. FIG. 2 is a sectional view taken along line CC of FIG. 1; It is a figure which shows how wash water flows in a 1st step. FIG. 10 is a diagram showing how wash water flows in the second stage; FIG. 11 is another diagram showing how the wash water flows in the second stage; FIG. 2 is an enlarged view of the first conduit of FIG. 1; FIG. 14 is a diagram showing a state in which wash water is flowing through the first water conduit of FIG. 13; It is a side cross-sectional view showing a state in which the toilet body of the toilet body of the first embodiment is disassembled. FIG. 4 is a side cross-sectional view showing a state in the middle of molding a toilet bowl side portion of the first embodiment.

Hereinafter, in the embodiments and modified examples, the same constituent elements are denoted by the same reference numerals, and overlapping descriptions are omitted. In each drawing, for convenience of explanation, some of the constituent elements are omitted as appropriate, or the dimensions of the constituent elements are shown enlarged or reduced as appropriate. The drawings should be viewed according to the orientation of the symbols.

(First embodiment)
First, the first contrivance of the flush toilet 10 of the first embodiment will be described. FIG. 1 is a side sectional view of the flush toilet 10 of the first embodiment. The flush toilet 10 has a toilet body 12 . Although the toilet body 12 of this embodiment is made of pottery, it may be made of resin or the like. The toilet body 12 of this embodiment is a Western-style toilet. The toilet bowl main body 12 of this embodiment is a wall-mounted type that is hung on a side wall portion 14 provided in the toilet room.

Hereinafter, the positional relationship of the components of the flush toilet 10 will be described using three mutually orthogonal directions. These directions are the front-rear direction X, the left-right direction Y, and the up-down direction Z of the toilet body 12 . The front-back direction X and the left-right direction Y are horizontal directions, and correspond to the front, back, left, and right of a person sitting on a toilet seat (not shown) attached to the toilet body 12 in a normal posture. The vertical direction Z is the vertical direction.

The toilet bowl body 12 includes a toilet bowl portion 16 and a toilet drainage channel 18 connected to the bottom portion of the toilet bowl portion 16 . In this embodiment, a hollow space 20 is formed between the toilet bowl portion 16 and the toilet drainage channel 18 .

The toilet drainage channel 18 serves as a passage for filth and water discharged from the toilet bowl portion 16 to a sewage channel (not shown). The trap portion 22 constitutes the toilet drainage channel 18 of the present embodiment. The toilet drain 18 has a first descending channel portion 24, an ascending channel portion 26, a second descending channel portion 28, and an outlet end portion 30 in order from upstream to downstream.

The first descending flow passage portion 24 is formed so as to continue to the bottom portion of the toilet bowl portion 16, descend toward the downstream side, and extend rearward. The ascending channel portion 26 is formed so as to connect to the downstream end portion of the first descending channel portion 24, rise toward the downstream side, and extend rearward. The second descending channel portion 28 is formed so as to connect to the downstream end portion of the ascending channel portion 26, descend toward the downstream side, and extend rearward. The outlet end 30 has a cylindrical shape and is provided on the rear surface 12a of the toilet body 12 so as to protrude rearward. The outlet end 30 is connected to a drain pipe 32 drawn from the side wall 14 of the toilet room, and the toilet bowl drain channel 18 is connected to the sewage channel via the drain pipe 32 .

A sealing water 34 is stored in the toilet bowl portion 16 and the toilet drainage channel 18 . The sealed water 34 is stored inside a sealed water reservoir 36 formed by the first descending channel portion 24 and the ascending channel portion 26 of the toilet drainage channel 18 . The water seal 34 blocks the flow of air in the direction of fluid flow within the toilet bowl drain 18 .

The toilet bowl drain 18 has an overflow edge 38 for establishing the level of the sealing water 34 . Specifically, the overflow edge 38 is for establishing the highest water level of the seal water 34 at rest. When water enters the toilet drainage channel 18 beyond the overflow edge 38, the water in the toilet drainage channel 18 overflows downstream from the overflow edge 38 and is discharged to the sewer side channel. As a result, the maximum water level of the water remaining in the toilet drain channel 18, ie, the stationary water seal 34, is determined. The overflow edge 38 is configured by the upper edge of the inner lower surface of the ascending channel portion 26 .

FIG. 2 is a cross-sectional view taken along line AA of FIG. As shown in FIGS. 1 and 2, the toilet drainage channel 18 has a cleaning port 40 penetrating the outer wall of the toilet body 12 forming the toilet drainage channel 18 . The cleaning port 40 is used for cleaning within the toilet drain 18 , such as removing objects such as foreign objects stuck within the toilet drain 18 . The term "object" as used herein includes dirt that is expected to flow through the toilet drain 18 during normal use, as well as foreign matter that is not expected to flow through the toilet drain 18 in such a manner. "Filth" here includes, for example, excrement, toilet paper, and the like. The "foreign matter" here includes, for example, diapers, mobile phones, and the like.

The cleaning port 40 can be opened and closed by a lid 42 (not shown in FIG. 1). The lid body 42 includes a lid body 44 for closing the cleaning port 40 from the front side of the outer wall of the toilet bowl body 12, a backing member 46 arranged on the back side of the outer wall, and the lid body 44 and the backing member 46 fastened together. and a threaded member 48 that The lid main body 44 and the backing member 46 are fastened together by a screw member 48 to be fixed to the toilet main body 12 while holding the periphery of the cleaning opening 40 of the toilet main body 12 therebetween. The backing member 46 has a plate shape. The backing member 46 has a vertical width dimension so that both ends of the backing member 46 can be applied to the inner surface of the toilet drainage channel 18 across the cleaning opening 40, and a horizontal width dimension that can be taken in and out from the cleaning opening 40. - 特許庁The lid body 44 and the backing member 46 can be separated from the toilet bowl body 12 by loosening the screw member 48 .

A sealed surface 50 is provided around the cleaning opening 40 on the outer surface of the toilet body 12 . A sealing member 52 is arranged between the lid body 44 and the surface to be sealed 50 of the toilet bowl body 12 . The sealing member 52 is an elastic body such as rubber. The surface to be sealed 50 is an annular flat surface, and the sealing member 52 contacts the surface to be sealed 50 . A sealing member 52 seals between the lid body 44 and the surface 50 to be sealed of the toilet body 12 , and restricts water leakage from the toilet drainage channel 18 .

FIG. 3 is an enlarged view of FIG. A first guide surface 54 is provided on the inner upper surface of the ascending channel portion 26 of the toilet drainage channel 18 to guide an object passing through the ascending channel portion 26 . The first guide surface 54 comes into contact with an object rising in the ascending channel portion 26 and guides the object rearward. The first guide surface 54 of the present embodiment is provided in a first partition wall portion 56 that separates the above-described hollow space 20 from the internal space of the toilet drainage channel 18 . The first guide surface 54 has an extension portion 54a extending above the overflow edge 38 .

The toilet body 12 has a second partition wall portion 58 provided above the overflow edge 38 in a side sectional view of the toilet body 12 . Here, "side cross-sectional view" means viewing a cross section orthogonal to the horizontal direction Y of the toilet body 12 in the horizontal direction Y as shown in FIG. The second partition wall 58 separates a first space 60 provided above the toilet drainage channel 18 from the internal space of the toilet drainage channel 18 . The first space 60 is a space separate from the second space 62 provided around the outlet end 30 of the toilet drainage channel 18, and in this embodiment, the space inside the common water channel 94 (described later). is applicable.

The inner surface of the toilet drain 18 is provided with a second guide surface 64 for guiding objects passing over the overflow edge 38 within the toilet drain 18 . The second guide surface 64 engages an object passing over the overflow edge 38 and guides the object in the rearward direction. The second guide surface 64 is provided above the overflow edge 38 in a side sectional view of the toilet body 12 . The second guide surface 64 of the present embodiment is provided on the second partition wall portion 58 described above.

The cleaning port 40 is provided behind the extension portion 54a at a position overlapping the extension portion 54a of the first guide surface 54 in the front-rear direction X in a side cross-sectional view of the toilet body 12 . The cleaning opening 40 is located at the same position in the up-down direction Z as at least part of the extension portion 54a of the first guide surface 54 . In this embodiment, the center 40a of the cleaning opening 40 is at the same position in the up-down direction Z as the extending portion 54a of the first guide surface 54 .

The cleaning port 40 is provided below the second guide surface 64 at a position overlapping the second guide surface 64 in the vertical direction in a side sectional view of the toilet body 12 . The cleaning opening 40 is at the same position in the front-rear direction X as at least part of the second guide surface 64 .

A center 40 a of the cleaning port 40 of this embodiment is provided above the overflow edge 38 . From another point of view, the center 40a of the cleaning port 40 is provided at a location overlapping the space that continues along the front-rear direction X between the ascending channel portion 26 and the second descending channel portion 28 in a side sectional view. It can be said that

4 is a cross-sectional view taken along line BB of FIG. 1. FIG. This figure also shows a cross-section of the ascending channel portion 26 perpendicular to the flow direction Pa of the fluid in the ascending channel portion 26 . The flow direction Pa is also the direction along the central axis La (see FIG. 1) of the ascending channel portion 26 . Let Ci be the inscribed circle with the smallest diameter that inscribes the inner surface of the flow channel section of the rising flow channel portion 26, and let Rd [mm] be the diameter of the inscribed circle Ci. The inscribed circle Ci is the inscribed circle Ci that has the smallest diameter in the cross section of the ascending channel portion 26 in the range from the downstream end to the upstream end of the ascending channel portion 26 .

At this time, as shown in FIG. 3, the vertical dimension Lb along the vertical direction Z (vertical direction) from the overflow edge 38 to the second guide surface 64 is 0.00 to the diameter Rd of the inscribed circle Ci. The size is set to 9 times or more and 1.2 times or less. This condition was derived based on experimental studies by the inventor.

A position Lb/2 upward from the overflow edge 38 is referred to as a reference position Pr. At this time, the extension portion 54a of the first guide surface 54 extends upward from the reference position Pr in a side cross-sectional view of the toilet body 12 . Further, the entire cleaning port 40 is provided behind the rear end 56a of the first partition wall 56 in a side cross-sectional view of the toilet body 12 . Also, the center 40a of the cleaning port 40 is provided forward of the overflow edge 38 in a side cross-sectional view of the toilet body 12 .

As shown in FIG. 2, in the present embodiment, the second guide surface 64 of the toilet drainage channel 18 has a downwardly convex curved shape in a cross section orthogonal to the front-rear direction X. As shown in FIG. The cleaning opening 40 is provided below the lower end 64 a of the second guide surface 64 , and the sealed surface 50 is provided at a position overlapping a part of the second guide surface 64 in the left-right direction Y. As shown in FIG.

Next, problems to be solved by the toilet body 12 of the present embodiment will be described using the toilet body 12 of the reference example. FIG. 5 is a side sectional view showing part of the toilet body 12 of the reference example. As with the toilet body 12 of the embodiment, the toilet body 12 of the reference example is provided with an outlet end 30 of the toilet drainage channel 18 so as to protrude rearward from the rear surface of the toilet body 12 . The cleaning opening 40 of the reference example is not provided at a position overlapping the first guide surface 54 in the front-rear direction X in a side cross-sectional view of the toilet body 12, but at a position overlapping the first guide surface 54 in the vertical direction Z. It is provided above the first guide surface 54 .

The wall-mounted toilet body 12 generally has a smaller dimension in the front-rear direction X than the floor-standing toilet body. This is because it is unnecessary to install a water storage tank at the rear of the toilet body 12 . Along with this, the wall-mounted toilet bowl body 12 usually has a structure in which the first partition wall portion 56 (the portion indicated by the two-dot chain line in FIG. 5) that forms the first guide surface 54 is omitted from the toilet bowl body 12 of the reference example. often become.

However, if the first partition wall portion 56 of the toilet bowl body 12 is omitted in this way, it becomes difficult for objects to pass through the toilet bowl drainage channel 18 . Therefore, as a countermeasure, it is conceivable to form the first guide surface 54 after providing the first partition wall portion 56 in the toilet body 12 as in the reference example.

In order to form the first guide surface 54 of the toilet body 12 in this way, if the cleaning port 40 is provided at a position as in the reference example, the first partition wall portion 56 that forms the first guide surface 54 of the toilet drainage channel 18 A wasteful space 66 that spreads forward is formed above the . In particular, it is necessary to provide a sealed surface 50 on the outer surface of the toilet body 12 around the cleaning opening 40 . A mold for molding a toilet base material (to be described later) cannot be arranged on the back side of the surface to be sealed 50 . Due to this relationship, there is no choice but to secure an extra space behind the surface 50 to be sealed inside the toilet drainage channel 18 . Accordingly, in the structure of the reference example, the wasted space 66 described above becomes even wider.

If such a space 66 is formed, the following problem may occur. FIG. 6 is a diagram for explaining problems of the toilet body 12 of the reference example. Consider a case where a compressed object Fm tries to pass through the toilet drainage channel 18 of the toilet body 12 . Here, toilet paper, which is an example of waste, is assumed as such an object Fm.

In this case, the compressed object Fm tries to expand from the compressed state in the space 66 after passing the ascending channel portion 26 in the toilet drainage channel 18 . The object Fm in such a spread state is swept backward toward the outlet end 30 side of the toilet drainage channel 18 by the head pressure Fw of the flush water. As a result, the object is caught on the wall portion 68 provided at the rear at a position overlapping the space 66 in the front-rear direction X, and clogging of the object is likely to occur. This water head pressure Fw is generated due to the height difference between the water level of flush water temporarily stored in the toilet bowl 16 and the location where the water head pressure Fw acts on the object Fm. Since such a problem occurs when the toilet paper used in normal use is flushed, there is a strong demand for countermeasures against it.

FIG. 7 is a diagram showing how the object Fm flows in the toilet body 12 of this embodiment. According to this embodiment, the cleaning port 40 is provided rearward of the extension portion 54a at a position overlapping the extension portion 54a of the first guide surface 54 in the front-rear direction X in the side sectional view of the toilet body 12 . Therefore, unlike the structure of the reference example, there is no need to form an extra space 66 inside the toilet drain channel 18 above the first partition wall portion 56 forming the first guide surface 54 of the toilet drain channel 18 . This makes it difficult for the compressed objects Fm to spread while the objects Fm pass through the toilet drainage channel 18, and clogging of the objects Fm can be easily suppressed.

In addition, as shown in FIG. 5, the cleaning opening 40 of the reference example overlaps in the front-rear direction X with a second guide surface 64 for guiding objects passing above the overflow rim 38 in the toilet drainage channel 18 . 2 is provided forward of the guide surface 64 . With such a structure, a useless space 72 that spreads upward is formed in front of the wall portion 70 that forms the second guide surface 64 of the toilet drainage channel 18 .

On the other hand, according to the present embodiment, the cleaning port 40 is provided below the second guide surface 64 at a position overlapping the second guide surface 64 in the vertical direction Z in the side sectional view of the toilet body 12 . Therefore, unlike the structure of the reference example, there is no need to form an extra space 72 in front of the second partition wall portion 58 that forms the second guide surface 64 of the toilet drainage channel 18 . This makes it difficult for the compressed objects Fm to spread while the objects Fm pass through the toilet drainage channel 18, and clogging of the objects Fm can be easily suppressed.

As shown in FIG. 3, the vertical dimension Lb from the overflow edge 38 to the second guide surface 64 is 0.9 times or more and 1.2 times or less the diameter Rd of the inscribed circle of the ascending channel portion 26. is set to If the vertical dimension Lb exceeds 1.2 times the diameter Rd, the space between the overflow edge 38 and the second guide surface 64 becomes excessively wide. As a result, the object Fm compressed in the space between the overflow edge 38 and the second guide surface 64 spreads widely, and the object Fm easily clogs due to contact with the rear wall portion 74 of the second guide surface 64. Become. On the other hand, if the vertical dimension Lb is less than 0.9 times the diameter Rd, the space between the overflow edge 38 and the second guide surface 64 becomes excessively narrow, and the space between the second guide surface 64 and the overflow edge 38 becomes too narrow. , the object Fm is likely to be clogged. In this respect, according to the present embodiment, it is possible to avoid the occurrence of these problems, and it becomes easier to suppress the clogging of the object Fm.

As shown in FIG. 7, the toilet drain 18 has a second descending channel portion 28 . With such a structure, the inner upper surface of the second descending passage portion 28 is provided with a slope 28a that extends downward toward the rear. Objects Fm passing above the overflow rim 38 are guided downward and rearward while hitting the slope 28a of the second descending channel portion 28 by the head pressure Fw of the flush water, and guided to the outlet end portion 30 of the toilet drainage channel 18. . As a result, it becomes easier to suppress clogging of the object Fm.

In addition, when sewage is about to flow backward from the sewage channel to the toilet drainage channel 18, the sewage can be dammed by the inner and lower surfaces of the second descending channel portion 28, preventing the sewage from entering the sealing water 34. can avoid.

Next, a second devised point of the flush toilet 10 will be described. FIG. 8 is a configuration diagram of the flush toilet 10. As shown in FIG. The flush toilet 10 further includes a flush water supply device 76 . The cleaning water supply device 76 is configured using a flush valve, a water storage tank, and the like.

FIG. 9 is a sectional view taken along line CC of FIG. As shown in FIGS. 1 and 9 , the toilet body 12 includes, in addition to the toilet bowl portion 16 and the toilet drainage channel 18 , water discharge portions 78 A and 78 B for discharging flush water into the toilet bowl portion 16 .

The toilet bowl portion 16 includes a bowl-shaped waste receiving surface 80 for receiving waste, a rim portion 82 forming the upper end portion of the toilet bowl portion 16, and a water storage portion recessed downward from the lower edge of the waste receiving surface 80. 84 and. The contaminant receiving surface 80 has a shape in which the radius of curvature in plan view is the smallest at the front end 80a. An overhang portion 86 protruding inward is provided on the upper portion of the inner peripheral surface of the rim portion 82 .

The water storage portion 84 forms the bottom portion of the toilet bowl portion 16 and has a bottomed shape. The water storage portion 84 has a bottom wall surface 84a and a plurality of standing wall surfaces 84b to 84d rising from the bottom wall surface 84a. The inlet 18a of the toilet drainage channel 18 opens at the rear portion of the bottom wall surface 84a. A part of the sealing water 34 described above is stored as a pooled water 88 in the pooled water portion 84 .

The vertical wall surfaces 84b to 84d include a left vertical wall surface 84b (first vertical wall surface) provided on the left side (the right side in FIG. 9) which is one of the left and right sides of the water storage section 84, and the other left and right side of the water storage section 84. A right vertical wall surface 84c (second vertical wall portion) provided on the right side (the left side in the paper surface of FIG. 9) is included. Further, the vertical wall surfaces 84b to 84d include a rear vertical wall surface 84d provided on the rear side of the water storage portion 84. As shown in FIG. The left vertical wall surface 84b and the right vertical wall surface 84c form an induced flow Fwf (see FIG. 11), which will be described later. are connected. The left vertical wall surface 84b of the present embodiment smoothly connects to the rear vertical wall surface 84d via the second concave curved surface 84f. The right vertical wall surface 84c of this embodiment also smoothly connects to the rear vertical wall surface 84d via the third concave curved surface 84g.

The toilet bowl portion 16 has a left side area 16a (first side area) that is one of the left and right sides, and a right side area 16b (second side area) that is the other side (the left side in this figure). . The left side region 16a is a region arranged on one left and right side with respect to the left and right center line Lc of the toilet bowl portion 16, and the right side region 16b is arranged on the other left and right side with respect to the left and right center line Lc. area. The left-right center line Lc is a straight line that extends in the front-rear direction X and bisects the dimension along the left-right direction Y of the inner surface portion of the toilet bowl portion 16 .

The water discharge portions 78A and 78B include a first water discharge portion 78A having a first water discharge hole 90A formed in the right side region 16b of the toilet bowl portion 16, and a second water discharge portion 78A formed in the left side region 16a of the toilet bowl portion 16. and a second water discharge portion 78B having a water discharge hole 90B. 90 A of 1st water discharge holes of this embodiment are provided in the position which overlaps with the water storage part 84 and the left-right direction Y in planar view. The first water discharge hole 90A of this embodiment is formed on the right side, which is the other left and right side of the water reservoir 84, and the second water discharge hole 90B of this embodiment is formed on the left side, which is one of the left and right sides of the water reservoir 84. be done.

90 A of 1st water discharge holes are open|released toward the front, and it is toward the one side of the circumferential direction in the toilet bowl part 16 (counterclockwise direction in the space of FIG. 9, hereinafter also simply called counterclockwise direction). Spit out the wash water. The first water discharge hole 90A discharges cleansing water in this manner, thereby forming a first swirl flow Fwa (see FIG. 11) directed rearward in the right side region 16b of the toilet bowl 16, which will be described later. The second water discharge hole 90B is open toward the right side, which is the other left and right side, and discharges cleansing water into the toilet bowl 16 in the counterclockwise direction.

The first water discharge portion 78A has a first water passage 92A for supplying wash water to the first water discharge holes 90A, and the second water discharge portion 78B has a second water passage for supplying wash water to the second water discharge holes 90B. It has two water passages 92B. Washing water is supplied to the first water passage 92A and the second water passage 92B through a common water passage 94 from a water supply pipe 76a that is part of the washing water supply device 76. As shown in FIG. The first water passage 92A and the second water passage 92B branch off from the downstream end of the common water passage 94 to the left and right.

The first water conduit 92A is formed to extend counterclockwise from the downstream end of the common water conduit 94, which is the starting end. 90 A of 1st water discharge holes are formed in the terminal part of 92 A of 1st water paths.

The second water passage 92B is formed so as to extend from the downstream end of the common water passage 94, which is the starting end, to the other side in the circumferential direction (clockwise direction in the paper surface of FIG. 9, hereinafter simply referred to as the clockwise direction). be. A folded portion 92Ba is formed at the end portion of the second water passage 92B, and a second water discharge hole 90B is formed at the tip portion of the folded portion 92Ba.

The toilet bowl 16 has water conduits 96A and 96B for swirlingly guiding the wash water discharged from the water discharge holes 90A and 90B. The water conduits 96A and 96B include a first water conduit 96A corresponding to the first water outlet 90A and a second water conduit 96B corresponding to the second water outlet 90B. The water conduits 96A, 96B are formed by part of the waste receiving surface 80 of the toilet bowl 16 and the rim 82, and are formed to extend counterclockwise from the corresponding water discharge holes 90A, 90B.

The toilet bowl portion 16 has a guide surface 98 formed on the inner peripheral surface of the toilet bowl portion 16 in the right side region 16b behind the front end 84h of the water storage portion 84. As shown in FIG. A portion adjacent to the guide surface 98 in the inner peripheral surface portion of the toilet bowl portion 16 from the first water discharge hole 90A to the guide surface 98 is called an adjacent portion 100 . The guide surface 98 is continuous with the adjacent portion 100 of the toilet bowl portion 16 via a curved portion 102 that is concave radially outward. In this embodiment, in a plan view, the adjacent portion 100 of the toilet bowl portion 16 has a concave curved surface, whereas the guide surface 98 has a flat surface. Thereby, the guide surface 98 is provided so that the first swirl flow Fwa (see FIG. 11) formed by the wash water discharged from the first water discharge holes 90A can collide. The guide surface 98 can thus guide the first swirl flow Fwa that has collided with itself backward.

A cleaning method using the above-described flush toilet 10 will be described. The flush toilet bowl 10 of the present embodiment discharges wastes by a flush-type cleaning method in which wastes are washed away using a water drop. The washing water supply device 76 performs a supply operation of supplying a predetermined amount of washing water to the water conduits 92A, 92B, and 94 when a predetermined washing start condition is satisfied. The cleaning start condition is, for example, that the cleaning water supply device 76 receives a cleaning start command through operation of an operation member such as a lever or an electric device such as a remote controller or a smartphone.

FIG. 10 is a diagram showing how washing water flows in the first stage. The first stage here refers to the stage when flush water begins to flow into the toilet bowl 16 . In this figure, the direction of flow of washing water is indicated by an arrow.

Wash water is supplied from the wash water supply device 76 to the water passages 92A, 92B, 94, supplied from the water passages 92A, 92B, 94 to the water discharge holes 90A, 90B, and discharged from the water discharge holes 90A, 90B. The wash water discharged from the first water discharge holes 90A forms a first swirl flow Fwa that travels rearward in the left side region 16a via the front end 80a of the dirt receiving surface 80. As shown in FIG. The first swirl flow Fwa is formed as the main flow. As used herein, the term "mainstream" refers to a streaky flow in which some of the wash water is partially collected. The first swirl flow Fwa collides with the guide surface 98 and is guided rearward by the guide surface 98 in a weakened state. FIG. 10 shows the state immediately before the first swirl flow Fwa joins the first water flow Fwb described below.

A folded portion 92Ba is provided in the second water discharge portion 78B, and the turbulent flow through the folded portion 92Ba is discharged in a wide angle range from the second water discharge hole 90B before being sufficiently adjusted. As a result, the flushing water discharged from the second water discharge hole 90B flows into the water reservoir 84 from behind, and flows through the waste receiving surface 80 behind the water reservoir 84 into the toilet bowl. A second swirling flow Fwc directed forward is formed in the right side region 16b of 16 . The first water flow Fwb and the second swirl flow Fwc are formed as the mainstream. The second water discharger 78B is configured to form such a first water flow Fwb and the second swirl flow Fwc by discharging washing water from the second water discharge holes 90B.

The first water flow Fwb flows into the water reservoir 84 from behind so as to drop into the water reservoir 84 from the dirt receiving surface 80 . The first water flow Fwb falls while coming into contact with the rear wall surface 84 d of the reservoir 84 and flows toward the entrance 18 a of the toilet drainage channel 18 .

The wash water that forms the first swirl flow Fwa and the second swirl flow Fwc gradually flows down from the dirt receiving surface 80 toward the pooled water portion 84 , thereby forming a water flow Fwd from the dirt receiving surface 80 toward the pooled water portion 84 . to form

FIG. 11 is a diagram showing how washing water flows in the second stage. The second stage here refers to a stage after a lapse of time from the first stage. The flow of the first swirl flow Fwa and the second swirl flow Fwc is the same as in the first stage.

In the second stage, the first swirl flow Fwa guided rearward by the guide surface 98 joins with the first water flow Fwb formed by the wash water discharged from the second water discharge holes 90B to form the main flow Fwe. The second water discharge portion 78B can also be considered to be configured to form the first water flow Fwb that joins the first swirling flow Fwa by the wash water discharged from the second water discharge holes 90B. The first swirl flow Fwa merges with the first water flow Fwb from the side in the flow direction of the first water flow Fwb. As a result, the main flow Fwe formed by the confluence of the first swirl flow Fwa and the first water flow Fwb is formed at a location closer to the second swirl flow Fwc than the location where the first water flow Fwb flowed. The main flow Fwe flows into the water storage portion 84 from the rear so as to drop while contacting the right standing wall surface 84c of the water storage portion 84 . This mainstream Fwe has the highest flow rate among the flows formed on the filth receiving surface 80 of the toilet body 12 . The main flow Fwe is also the flow having the highest flow rate among the water flows flowing into the reservoir 84 from the dirt receiving surface 80 .

FIG. 12 is another diagram showing how the washing water flows in the second stage. As shown in FIGS. 11 and 12, the main flow Fwe flowing into the water storage portion 84 from behind flows downward while contacting the right standing wall surface 84c of the water storage portion 84. As shown in FIGS. The main flow Fwe collides with the bottom wall surface 84a and the left standing wall surface 84b of the stagnant water portion 84, changes its direction upward and rearward, and then rises in the stagnant water portion 84 and then descends due to its own weight. An induced flow Fwf is formed. This induced flow Fwf rises rearward in the water storage portion 84 and then descends, so that it becomes a flow that pushes waste into the entrance 18 a of the toilet drainage channel 18 . In this way, the right vertical wall surface 84c, the left vertical wall surface 84b and the bottom wall surface 84a of the water storage portion 84 are in contact with the right vertical wall surface 84c, and the flow that flows into the water storage portion 84 from behind causes waste to flow into the toilet drainage channel 18. is configured to form an induced flow Fwf that pushes the

The effects of the above flush toilet 10 will be described.

(A) The toilet bowl portion 16 of the present embodiment collides with the first swirl flow Fwa directed rearward in the right side region 16b of the toilet bowl portion 16, and can guide the collided first swirl flow Fwa rearward. It has a face 98 . Therefore, the collision with the guide surface 98 decelerates the first swirling flow Fwa. Along with this, the flow rate of the water flow passing through the filth receiving surface 80 behind the water storage portion 84 is reduced without flowing into the water storage portion 84 from behind, and the water is collected while contacting the right standing wall surface 84dc of the water storage portion 84. The flow rate of water flowing into the water portion 84 from the rear can be increased. Therefore, it is possible to increase the flow rate of the induced flow Fwf that pushes the waste into the toilet drainage channel 18, thereby improving the waste discharge capacity.

The first swirling flow Fwa formed by the first water discharger 78A passes through the front end 80a of the dirt receiving surface 80. As shown in FIG. Therefore, the momentum of the first swirling flow Fwa is moderately weakened in the course of passing through the front end 80 a of the dirt receiving surface 80 , and then the first swirling flow Fwa collides with the guide surface 98 . Therefore, even if the flow rate of the wash water suddenly increases, it is easy to suppress the generation of droplets due to collision with the guide surface 98 .

The first water flow Fwb formed by the second water discharging portion 78B joins with the first swirl flow Fwa to form a main stream Fwe that flows into the pooled water portion 84 from behind. Therefore, it is possible to further increase the flow rate of the induced flow Fwf that pushes the waste into the toilet drainage channel 18, thereby further improving the waste discharge capacity.

The second water discharging portion 78B forms a second swirling flow Fwc that flows forward in the right side region 16b via the filth receiving surface 80 behind the water storage portion 84 . Therefore, while the washing water discharged from the second water discharge holes 90B forms the first water flow Fwb that merges with the first swirl flow Fwa, a wide area can be washed with the second swirl flow Fwc.

An overhang portion 86 is provided above the guide surface 98 (see FIG. 8). Therefore, when droplets are generated by collision with the guide surface 98 , the overhang portion 86 can easily suppress the splashing of the droplets to the outside of the toilet bowl portion 16 .

Further, the guide surface 98 is provided at a position overlapping the water storage portion 84 in the left-right direction Y in plan view. Therefore, when the inside of the toilet bowl portion 16 is viewed from the front, the guide surface 98 is provided at a position where it is difficult to see, and good design can be obtained.

Next, other features of the flush toilet 10 will be described. FIG. 13 is an enlarged view of the first water conduit 96A of FIG. The first water conduit 96A includes a concavely curved bottom surface 96a extending radially outward of the toilet bowl portion 16, a concavely curved side surface 96c extending upward from an outer peripheral end 96b of the bottom surface 96a, and a diameter from an upper end 96d of the side surface 96c. and a return surface 96e extending inward. The bottom surface 96a of the first water conduit 96A is part of the contaminant receiving surface 80, and the side surface 96c and return surface 96e of the first water conduit 96A are part of the rim portion 82. As shown in FIG. In this embodiment, in a vertical cross section passing through the center 16c (see FIG. 8) of the upper end opening of the toilet bowl 16 in plan view, the curvature radius of the side surface 96c is set to be larger than the curvature radius of the bottom surface 96a. .

The return surface 96e has a horizontally extending flat surface 96f and an edge surface 96g extending upward toward the radially inner side. The term “horizontal” here includes not only literally horizontal but also substantially horizontal. The flat surface 96f of this embodiment continues to the upper end 96d of the side surface 96c of the first water conduit 96A, and its inner peripheral end continues to the edge surface 96g.

The effects of the above flush toilet 10 will be described. FIG. 14 is a diagram showing a state in which the wash water Wa is flowing through the first water conduit 96A. A radially outward centrifugal force Fp is applied to the flush water Wa traveling in the circumferential direction through the first water conduit 96A of the toilet body 12 . A bottom surface 96a of the first water conduit 96A is concavely curved. Therefore, the centrifugal force applied to the wash water is smoothly converted into an upward force Fq1 by the bottom surface 96a of the first water conduit 96A. The upward force Fq1 pushes up the wash water traveling along the first water passage 96A in the circumferential direction, and flows along not only the bottom surface 96a but also the side surface 96c of the first water passage 96A.

A side surface 96c of the first water conduit 96A is concavely curved. Therefore, as described above, when the wash water pushed up from the bottom surface 96a of the first water passage 96A starts running along the side surface 96c of the first water passage 96A, the upward force Fq1 of the wash water is applied to the side surface of the first water passage 96A. It is smoothly converted into a radially inward force Fq2 by 96c. As a result, the wash water flowing through the water conduits 96A and 96B is transmitted over a wide range in the vertical direction of the first water conduit 96A without significantly losing the upward force Fq1.

In addition, since the return surface 96e of the first water conduit 96A has a flat surface 96f extending horizontally, the distance from the outer peripheral end 16d of the toilet bowl portion 16 to the inner peripheral end 16e of the upper end portion (rim portion 82) of the toilet bowl portion 16 Makes it easier to keep your distance. Accordingly, when a large amount of flush water flows through the water conduits 96A and 96B, splashing of splashes to the outside of the toilet bowl 16 can be easily suppressed.

In addition, since the bottom surface 96a and the side surface 96c of the first water conduit 96A are concavely curved, it is easier to wipe smoothly without getting stuck between them, compared to the case where one of them is planar.

In addition, when the washing water is discharged from the first water discharge hole 90A, the front end portion 16ba (see FIG. 11) of the right side region 16b of the toilet bowl portion 16 immediately after passing through the front end 80a of the filth receiving surface 80 , the position of the upper end of the first swirl flow Fwa is the highest. The flow rate of the wash water supplied from the wash water supply device 76 is set so that it does not reach the return surface 96e of the first conduit 96A at the front end portion 16ba of the right side region 16b of the toilet bowl portion 16. FIG. 14 shows an example in which the flow rate of washing water is set to a magnitude that does not reach the return surface 96e of the first water conduit 96A at the front end 80a of the contaminant receiving surface 80. FIG.

Next, a method for forming the base material of the toilet will be described. The term "toilet base material" as used herein refers to a semi-finished product of the toilet bowl body 12 required to obtain the ceramic toilet bowl body 12, and is obtained by casting.

FIG. 15 is a side cross-sectional view showing a disassembled state of the toilet body of the toilet body 12. As shown in FIG. The toilet base material of the toilet bowl body 12 includes an upper surface side portion 104 and a toilet bowl side portion 106 which are formed by dividing the toilet bowl body 12 into upper and lower parts. The upper surface side portion 104 is a portion that includes the upper surface portion of the toilet body 12 . The toilet bowl side portion 106 is a portion below the upper surface side portion 104 of the toilet body 12 and includes most of the toilet bowl portion 16 .

The toilet bowl main body 12 is obtained by forming the above-described upper surface side portion 104 and the toilet bowl side portion 106 by molding the toilet bowl base material by casting, joining them by adhesion or the like, and then performing a firing process. A molding method for obtaining the toilet base material of the toilet bowl side portion 106 by cast molding will be mainly described below.

FIG. 16 is a side cross-sectional view showing a state in the middle of forming the toilet bowl base of the toilet bowl side portion 106 . Toilet bowl side portion 106 is obtained by casting using a plurality of molds 108A-108D. A plurality of molds 108A to 108D are made of a water absorbing material such as gypsum. The molds 108A to 108D of this embodiment include an upper mold 108A arranged on the upper side, a lower mold 108B arranged on the lower side, a horizontal mold 108C arranged on both left and right sides, and a rear mold arranged on the rear side. 108D are included.

Each mold 108A-108D has a molding surface 110 for molding the toilet bowl base of the bowl-side portion 106. As shown in FIG. The molding surface 110 of the rear mold 108D is for molding at least a portion of the portion of the toilet bowl side portion 106 facing the rear. The molding surface 110 of the rear mold 108</b>D has at least the shape of a cylindrical wall forming the outlet end 30 of the toilet drainage channel 18 . When the plurality of molds 108A to 108D are mated, mold spaces 112 are formed by the molding surfaces 110 of the plurality of molds 108A to 108D.

Casting to obtain the toilet bowl side portion 106 includes the following steps. First, a step S1 of forming a mold space 112 for molding the toilet base material of the toilet bowl side portion 106 is performed by matching a plurality of molds 108A to 108D. Next, a step S2 of injecting an uncured slurry 114 into the mold space 112 is performed. By performing this step S2, the slurry 114 hardens along the surfaces of the respective molds 108A to 108D, and the hardened portion of the slurry 114 forms the toilet bowl base of the toilet bowl side portion 106. As shown in FIG. Next, a step S3 of discharging the unhardened slime 114 remaining in the toilet bowl base of the toilet bowl side portion 106 is performed. Next, step S4 is performed to demold each of the molds 108A to 108D from the toilet base.

Here, the rear die 108D forms the closing portion 116 that closes the internal space of the toilet drainage channel 18 from the downstream side. The blocking portion 116 is formed flush with the front end surface 30a of the wall forming the outlet end portion 30 of the toilet drainage channel 18 and has a plate shape. The closing portion 116 of the toilet bowl body is cut off with fingers or a tool while the toilet bowl body is in a soft state before firing after the above-described step S4. This makes it easier to cut off the blocker 116 than when the blocker 116 is formed at a location recessed from the tip opening of the outlet end 30 of the toilet drainage channel 18 . As a result, it becomes easier to avoid a situation in which burrs remain at the excised portion of the blocking portion 116, thereby avoiding the risk of paper jams in the toilet drainage channel 18 due to the remaining burrs.

The present invention has been described above based on the embodiments. Next, modified examples of each component will be described.

(Regarding the first contrivance)
The toilet drainage channel 18 of the toilet body 12 does not have to have the second descending channel portion 28 .

The cleaning port 40 may be provided rearward at a position overlapping the extension portion 54a of the first guide surface 54 in the front-rear direction X. As shown in FIG. For example, the cleaning opening 40 may be provided in front of the second guide surface 64 . Moreover, the vertical dimension Lb from the overflow edge 38 of the toilet drainage channel 18 to the second guide surface 64 is not particularly limited.

(Regarding the second contrivance)
Although the toilet body 12 has been described as a wall-mounted type, it may be a floor-mounted type. The flush toilet 10 may be cleaned using a cleaning method other than the wash-off method. This cleaning method is, for example, a siphon method.

The toilet body 12 may have only the first water discharger 78A and may not have the second water discharger 78B. Even in this case, the effect of (A) can be obtained. In this case, in order to obtain the effect of (A), the first water discharge hole 90A of the first water discharge part 78A is located at the place where the second water discharge hole 90B of the second water discharge part 78B was formed, that is, the toilet bowl. 16 may be formed in the left side region 16a. In this case, the first water discharge portion 78A is configured to form the first swirl flow Fwa with the wash water discharged from the first water discharge holes 90A, and at least part of the first swirl flow Fwa collides with the guide surface 98. It is good if it is.

The first water discharge hole 90A, the second water discharge hole 90B, the first swirl flow Fwa, the second swirl flow Fwc, the main stream Fwe, etc. may be provided at positions opposite to those in the embodiment. For example, the first water discharger 78A may form the first swirl flow Fwa by discharging wash water into the toilet bowl 16 in the clockwise direction from the first water discharge holes 90A. In this case, the first water discharge portion 78A discharges cleansing water from the first water discharge holes 90A, thereby forming a first swirling flow Fwa directed rearward in the right side region 16b, which is one of the left and right sides of the toilet bowl portion 16. good. In this case, the water storage portion 84 should be configured so that the water flowing into the water storage portion 84 from behind while contacting the left standing wall surface 84b, which is the other left and right side of the water storage portion 84, forms the induced flow Fwf. Just do it. In this case, the guide surface 98 may be formed in the right side region 16 b that is one of the left and right sides of the toilet bowl portion 16 .

The guide surface 98 may have a concave curved surface with a smaller radius of curvature than the concave curved surface formed by the adjacent portion 100 of the toilet bowl portion 16 instead of a flat surface in plan view. Also by this, the guide surface 98 is provided so that the first swirl flow Fwa can collide.

The second water discharge portion 78B may form only the first water flow Fwb by the wash water discharged from the second water discharge holes 90B, and may not form the second swirl flow Fwc.

The shape of the water conduits 96A and 96B is not particularly limited. For example, the bottom surfaces 96a and side surfaces 96c of the water conduits 96A and 96B do not have to be concavely curved, and the water conduits 96A and 96B do not have to have return surfaces 96e.

The embodiments and modifications of the present invention have been described in detail above. All of the above-described embodiments and modifications merely show specific examples for carrying out the present invention. The contents of the embodiments and modifications do not limit the technical scope of the present invention. Design changes are possible. In the above-described embodiment, the content that allows such design changes is emphasized by adding notations such as "of the embodiment" and "in the embodiment", but even contents without such notations can be designed. Changes are allowed. Any combination of the above components is also effective as an aspect of the present invention. The hatching attached to the cross section of the drawing does not limit the material of the hatched object.

Generalizing the inventions embodied by the above embodiments and modifications leads to the following technical ideas. Hereinafter, description will be made using the embodiments described in the problems to be solved by the invention.

A flush toilet bowl of a second aspect has, in the first aspect, a second water discharge hole formed in a rear portion of the first side region, and a water outlet extending toward one side in the circumferential direction in the toilet bowl portion. 2. A second water discharge section for discharging cleansing water from the second water discharge holes, wherein the second water discharge section joins the first swirling flow guided by the guide surface by the cleansing water discharged from the second water discharge holes. A first water flow may be formed, and the first water flow may form a main flow flowing into the water storage portion from behind by joining with the first swirling flow.
According to this aspect, it is possible to further increase the flow rate of the induced flow that pushes waste into the toilet drainage channel, thereby further improving the waste discharge capacity.

In the flush toilet of the third aspect, in the second aspect, the second water discharge part is configured to cause flush water discharged from the second water discharge hole to flow through the filth receiving surface behind the water storage part. A second swirl flow directed forward may be formed in a second lateral region on the other left and right side of the toilet bowl.
According to this aspect, while the wash water discharged from the second water jetting part forms the first water stream that joins the first swirling flow, a wide area can be washed by the second swirling flow.

A flush toilet of a fourth aspect is the flush toilet of any one of the first to third aspects, wherein the toilet bowl portion has a water conduit for guiding flush water discharged from the first water discharge hole so as to swirl. The water conduit includes a concavely curved bottom surface extending radially outward of the toilet bowl portion, a concavely curved side surface extending upward from an outer peripheral end of the bottom surface, and extending radially inwardly from an upper end of the side surface. and a return surface, wherein the return surface may have a horizontally extending flat surface.
According to this aspect, the wash water flowing through the water conduit is transmitted over a wide range in the vertical direction of the water conduit without significantly losing its upward force.

When the inventions embodied by the above embodiments and modifications are generalized, it can be said that the inventions described in the following items are included.

(Item 1)
A method for forming a toilet bowl base of the toilet bowl side portion of a toilet body configured by joining an upper surface side portion and a toilet bowl side portion below the upper surface side portion,
The toilet body includes a toilet bowl and a toilet drainage channel connected to the bottom of the toilet bowl,
an outlet end of the toilet drainage channel is provided on the rear surface of the toilet body so as to protrude rearward;
Forming a mold space for molding the toilet base material by matching a plurality of molds;
The plurality of molds include a rear mold for molding a portion facing the rear of the toilet body,
The rear mold forms a closing portion that closes the internal space of the toilet drainage channel from the downstream side,
The method of manufacturing a toilet bowl body, wherein the closing portion is formed flush with the front end surface of the wall portion forming the outlet end portion.

DESCRIPTION OF SYMBOLS 10... Flush toilet bowl, 12... Toilet bowl body, 16... Toilet bowl part, 16a... Left lateral area (first lateral area), 18... Toilet drainage channel, 78A... First water discharge part, 78B... Second water discharge part, 80... Waste receiving surface 80a...Front end 84...Water reservoir 84b...Elevated wall surface 90A...First water discharge hole 90B...Second water discharge hole 96A...Water conduit 96a...Bottom surface 96c...Side surface 96e... return surface, 96f...flat surface, 98...induction surface.

Claims (2)

A flush toilet comprising a toilet body,
The toilet body is
a toilet bowl portion having a bowl-shaped waste receiving surface and a pooled water portion recessed downward from a lower edge of the waste receiving surface;
a toilet drainage channel connected to the bottom of the toilet bowl;
A first swirling flow is formed rearward in a first side area on one of the left and right sides of the toilet bowl by discharging flush water from the first water discharge holes toward one side in the circumferential direction into the toilet bowl. and a first water discharge unit,
The water-retaining portion forms an inductive flow that pushes waste into the toilet drainage channel by a water flow that flows into the water-retaining portion from behind while coming into contact with vertical wall surfaces provided on the other left and right sides of the water-retaining portion. configured,
The toilet bowl portion is formed on the inner peripheral surface of the toilet bowl portion in the first lateral region behind the front end of the water storage portion, and is capable of guiding backward the first swirling flow that collides with itself. having a face,
a second water discharge portion having a second water discharge hole formed in a rear portion of the first lateral region, and discharging cleansing water from the second water discharge hole toward one side in the circumferential direction in the toilet bowl portion; prepared,
The second water discharge part forms a first water flow that merges with the first swirl flow guided by the guide surface by the wash water discharged from the second water discharge hole,
The first water flow joins with the first swirl flow to form a main stream flowing into the pooled water portion from behind ,
The second water discharge part is configured to be flushed with the wash water discharged from the second water discharge hole on a second side of the other left and right side of the toilet bowl part behind the water storage part via the filth receiving surface. Forming a second swirling flow toward the front of the region,
The first water flow that merges with the first swirl flow guided by the guide surface overlaps the second swirl flow in the front-rear direction and is formed in front of the second swirl flow in a plan view. . the toilet bowl portion has a water conduit for guiding flush water discharged from the first water discharge hole so as to swirl;
The water conduit includes a concave curved bottom surface extending radially outward of the toilet bowl portion, a concave curved side surface extending upward from an outer peripheral end of the bottom surface, and a barb extending radially inward from an upper end of the side surface. having a surface and
2. The flush toilet according to claim 1 , wherein said return surface has a horizontally extending flat surface.

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