JP2022041279A - Water closet - Google Patents

Abstract

To provide a water closet that enables strong washing even on a rim upper wall part and also enables strong washing even on a rear area of a bowl part.SOLUTION: The water closet according to an embodiment is a water closet that washes a toilet bowl body with washing water, and comprises a bowl part, a rim part, a rim water passage, a water discharge port, and a slit opening part. The bowl part is a part that receives excrement. The rim part is formed on the upper part of the bowl part, and has a rim outer wall part, a rim upper wall part, and a rim inner wall part. The rim water passage is formed in the rim part, and has a shelf part that guides the washing water to swirl in the upper part of the bowl part. The water discharge port discharges the washing water toward the rim water passage. The slit opening part allows the washing water to flow down from the rim water passage. The rim part has a rim internal space surrounded by the rim outer wall part, the rim upper wall part, the rim inner wall part, and the shelf part, and a cross-sectional area of the rim internal space decreases from the side part to the rear part of the bowl part.SELECTED DRAWING: Figure 3

Description

The disclosed embodiment relates to a flush toilet.

Conventionally, a rim portion is formed so as to cover a water passage (referred to as a rim water passage) in which wash water swirls in one direction at the upper edge portion of the bowl portion, and a slit formed between the rim portion and the upper edge portion of the bowl portion. A water-washing stool that cleans the bowl surface while flowing wash water from the opening toward the bowl surface of the bowl portion is known.

In such a flush toilet, it is necessary to flush the flush water while swirling along the upper edge of the bowl to clean the bowl surface. For this reason, there is a flush toilet that swirls the wash water around the upper edge of the bowl portion by changing the width of the slit opening to adjust the amount of wash water flowing down from the rim water passage (for example, Patent Document 1). reference).

Japanese Unexamined Patent Publication No. 2017-36596

In general, the rear part of the bowl portion (bowl surface) is a region where filth and the like are easily attached and easily soiled. Therefore, it is necessary to wash the rear portion of such a bowl portion with washing water having a strong water force.

However, in the conventional flush toilet, the amount of wash water is reduced later because the wash water discharged from the spout flows down toward the bowl portion in the process of swirling. In particular, the amount of wash water is further reduced on the downstream side of the rim water passage in the rear part of the bowl portion. For this reason, it was difficult to remove dirt from the rear region of the bowl portion and the upper portion (rim upper wall portion) in the rim water passage on the rear side of the bowl portion.

One aspect of the embodiment is to provide a flush toilet that can be strongly washed even in the upper wall portion of the rim and also in the rear region of the bowl portion.

The flush toilet according to one embodiment is a flush toilet that cleans the toilet body with washing water, and is formed on a bowl portion that receives filth and an upper portion of the bowl portion, and has a rim outer wall portion and a rim upper wall. A rim portion having a portion and an inner wall portion of the rim, a rim water passage having a shelf portion formed in the rim portion and guiding the washing water to swirl in the upper part of the bowl portion, and a rim water passage toward the rim water passage. A spout for discharging water and a slit opening for flowing wash water from the rim water passage are provided, and the rim portion is surrounded by the rim outer wall portion, the rim upper wall portion, the rim inner wall portion, and the shelf portion. It has a rim internal space, and the cross-sectional area of the rim internal space decreases from the side portion of the bowl portion toward the rear portion.

According to such a configuration, in the rear region of the bowl portion where dirt easily adheres, the cross-sectional area of the rim internal space becomes smaller from the side portion of the bowl portion to the rear portion, so that the amount of washing water is reduced in the process of swirling the washing water. Even if the amount of cleaning water is reduced, the cleaning water can be distributed throughout the internal space of the rim, and the entire internal space of the rim can be cleaned. Therefore, even the upper wall of the rim can be strongly cleaned.

In addition, since the cross-sectional area of the rim internal space decreases from the side of the bowl to the rear, the flow velocity of the swirling wash water increases, and the wash water flows down from the slit opening with strong water force even in the rear region of the bowl. Can be made to. Therefore, it is possible to strongly wash even in the rear region of the bowl portion.

Further, in the above-mentioned flush toilet, the width of the shelf portion becomes smaller toward the rear portion of the bowl portion.

According to such a configuration, the width of the shelf portion becomes smaller toward the rear portion of the bowl portion, so that the cross-sectional area of the rim internal space becomes smaller toward the rear portion of the bowl portion. As a result, the washing water flowing on the shelf portion is sufficiently supplied to each of the upper side and the slit opening side of the rim internal space. This makes it possible to clean the interior space of the rim and the rear region of the bowl portion.

Further, in the above-mentioned flush toilet, the width of the upper wall portion of the rim becomes smaller toward the rear portion of the bowl portion.

According to such a configuration, the width of the upper wall portion of the rim becomes smaller toward the rear portion of the bowl portion, so that the region where dirt easily adheres becomes smaller. Further, since the cross-sectional area of the rim internal space becomes smaller toward the rear portion of the bowl portion, sufficient cleaning water can be supplied to the upper portion (rim upper wall portion) of the rim internal space.

Further, in the above-mentioned flush toilet, the rim internal space is formed so that the cross-sectional area increases from the rear portion to the front portion of the bowl portion.

According to such a configuration, the internal space of the rim increases from the rear of the bowl to the front, so that the washing water occupying the internal space of the rim flows down from the slit opening as the internal space of the rim expands. Can be made to. Therefore, the washing water can flow down to the rear region of the bowl portion in a state where the water force is strong.

Further, in the above-mentioned flush toilet, the width of the shelf portion increases from the rear portion to the front portion of the bowl portion.

According to such a configuration, a small amount of washing water can be directed further forward by going around the rear part of the bowl portion, so that the washing water can be used to wash the interior space of the rim and the rear region of the bowl portion. , The bowl part can be reliably turned around.

Further, in the above-mentioned flush toilet, the width of the upper wall portion of the rim increases from the rear portion to the front portion of the bowl portion.

With such a configuration, the wash water in the upper part of the rim internal space can be made to flow down, which makes it easy for the wash water to flow down in the rear region of the bowl portion.

According to one aspect of the embodiment, even the upper wall portion of the rim can be strongly cleaned, and the rear region of the bowl portion can also be strongly cleaned.

FIG. 1 is a side sectional view showing a flush toilet according to an embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG. FIG. 3 is an explanatory diagram of the rim water passage. FIG. 4 is a diagram showing a cross-sectional portion from the left side portion to the rear portion of the bowl portion. FIG. 5A is a sectional view taken along line B1-B1 in FIG. FIG. 5B is a sectional view taken along line B2-B2 in FIG. FIG. 5C is a sectional view taken along line B3-B3 in FIG. FIG. 6 is a schematic view showing the mode of the flow of the washing water flowing through the rim water passage. FIG. 7 is a diagram showing a cross-sectional portion from the right side portion to the rear portion of the bowl portion. FIG. 8A is a sectional view taken along line C1-C1 in FIG. 7. FIG. 8B is a sectional view taken along line C2-C2 in FIG. 7. FIG. 8C is a cross-sectional view taken along the line C3-C3 in FIG. FIG. 8D is a cross-sectional view taken along the line C4-C4 in FIG.

Hereinafter, embodiments of the flush toilet bowl disclosed in the present application will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments shown below.

<Water-washing toilet>
The overall configuration of the flush toilet bowl 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a side sectional view showing a flush toilet bowl 1 according to an embodiment. FIG. 2 is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 1 and 2, the flush toilet bowl 1 includes a toilet bowl body 2. The toilet body 2 is made of pottery, for example. The toilet bowl body 2 may be made of resin or may be manufactured by combining pottery and resin. The toilet body 2 is a so-called wall-mounted type that is attached to the wall surface of the toilet room. A water supply device such as a water storage tank 3 which is a washing water source is installed above the rear side of the toilet bowl body 2.

The water storage tank 3 is connected to a water supply source (not shown) such as a water supply. When the cleaning operation is started by operating the operation lever (not shown) provided in the water storage tank 3, the drain valve (not shown) of the water storage tank 3 opens, and the predetermined amount of washing water (for example, for example) from the water storage tank 3 is opened. 6L) is supplied to the supply port 4 opened at the upper part on the central rear side of the toilet body 2. The supply port 4 may be formed not only in the center but also on the right side or the left side from the front-rear center line.

Further, in the flush toilet 1, for example, a water-saving type flush toilet in which the amount of wash water supplied from the water storage tank 3 is in the range of 3 L to 6 L, preferably a water-saving type flush in the range of 4.8 L to 6 L. Can be used for toilet bowls.

Further, the water supply device such as the water storage tank 3 may be another water supply device such as a flush valve capable of supplying a specified amount of washing water in addition to the water storage tank 3.

Further, a bowl portion 5 is formed on the front upper portion of the toilet bowl main body 2, and a supply port 4 to which a downstream end portion of the water storage tank 3 is connected and a rim water passage 11 described later are connected to the rear upper portion of the toilet bowl main body 2. A headrace 6 is formed so as to guide the wash water supplied from the water storage tank 3 from the supply port 4 to the rim water passage 11.

Further, the lower part of the bowl portion 5 is a reservoir portion 7, and a predetermined amount of reservoir water whose initial water level is indicated by WL is stored. Further, an inlet of the drain trap 8 is connected to the lower end of the water reservoir 7, and the drain trap 8 extends rearward from the inlet.

Further, the bowl portion 5 is formed in a bowl shape, and includes a rim portion 10 that forms a rim passage 11 for guiding wash water at the upper edge portion of the bowl surface that receives dirt.

The headrace 6 extends forward from the supply port 4 and is connected to the rim headrace 11. The headrace 6 extends from the vicinity of the supply port 4 arranged substantially in the center of the toilet bowl body 2 toward the bowl portion 5.

In the headrace 6, the wash water W1 is rectified well, the directionality of the wash water W1 is enhanced, the flow is arranged in a direction to go around the rim water passage 11 from the headrace 6, and the water force is relatively strong. The washing water W1 is discharged in the flow of the state.

Further, the headrace 6 is formed so that a part thereof is parallel to a part of the confluence portion of the rim waterway 11. In the vicinity of the outlet (water discharge port) 10a of the headrace 6, the direction of the flow of the wash water W2 trying to go around the rim waterway 11 is substantially the same, so that the wash water W1 flowing out from the water discharge port 10a of the headrace 6 is discharged. , Flowing through the rim water passage 11 in substantially the same turning direction (circumferential direction), forming a flow that tries to orbit the rim water passage 11 in a state where the water force is maintained (a state in which the flow rate and the flow velocity are substantially maintained). Can be done.

As a result, the wash water W1 that joins the rim water passage 11 from the headrace 6 flows in the direction opposite to the main flow (wash water W2) of the rim water passage 11, and the main flow (wash) from the slit opening 14 described later. It is possible to prevent the water W2) from flowing down to the bowl surface.

The rim portion 10 is formed in an annular shape over the entire circumference as an upper edge portion of the bowl portion 5. The rim portion includes a rim outer wall portion 12a, a rim upper wall portion 12b, and a rim inner wall portion 12c. The rim outer wall portion 12a forms an outer peripheral surface of the rim portion 10 and is formed in a standing wall shape so as to rise from the outer surface of the toilet bowl body 2 to the top. The rim upper wall portion 12b forms a flat surface at the upper portion of the rim portion 10. The rim inner wall portion 12c forms an inner peripheral surface of the rim portion 10 and extends from the rim upper wall portion 12b so as to hang down slightly inward.

A shelf portion 13 is formed at the lower portion of the rim portion 10. The shelf portion 13 is formed as a substantially flat surface extending outward from the upper edge portion of the bowl surface of the bowl portion 5 in the rim portion 10, and is formed in an annular shape over substantially the entire circumference of the bowl portion 5.

A slit opening 14 is formed between the rim portion 10 and the bowl surface of the bowl portion 5. The slit opening 14 is opened downward together with the rim inner wall portion 12c so as to form a water discharge portion toward the bowl surface of the rim portion 10 below the rim water passage 11.

The drain trap 8 extending to the rear of the toilet body 2 includes an ascending pipe 81, a bent pipe 82, and a descending pipe 83. The upstream end of the ascending pipe 81 is connected to the bowl portion 5 (reservoir portion 7). The ascending pipe 81 is a pipe inclined so as to rise toward the rear.

The upstream end of the bent pipe 82 is connected to the downstream end of the ascending pipe 81. The bending pipe line 82 has an ascending bending portion 821 and a descending bending portion 822. The ascending bending portion 821 is a portion that is continuous from the ascending pipeline 81 and is inclined so as to ascend toward the rear. The descending bending portion 822 is a portion that is continuous from the ascending bending portion 821 and is inclined so as to descend toward the rear. The connection portion between the ascending bending portion 821 and the descending bending portion 822 is the bending top portion of the highest portion of the bending pipe line 82.

The descending pipe 83 is connected to the downstream end of the bending pipe 82, that is, the downstream end of the descending bending portion 822. The descending pipeline 83 is a pipeline inclined so as to descend toward the rear. Further, the downstream end of the descending pipeline 83 is connected to a discharge port 9 for discharging washing water and filth from the toilet bowl main body 2. An equipment pipe, which is a pipe outside the flush toilet 1, is connected to the discharge port 9.

In front of the rising pipe 81 of the drain trap 8, a Zet spout 20 for injecting wash water toward the drain trap 8 (rising pipe 81) is formed. As shown in FIG. 2, the Zet spout 20 is formed at the outlet of the Zet headrace 21, and siphon action is generated by injecting the washing water of the Zet headrace 21 with a strong water force.

By the way, in the flush toilet 1, the wash water W2 discharged from the spout 10a of the rim portion 10 flows down toward the bowl surface of the bowl portion 5 in the process of turning, so that the rear region of the bowl portion 5 (see FIG. 2). ), The amount of washing water is small on the downstream side of the rim water passage 11. In the present embodiment, the rim water passage 11 is provided so as to have a strong detergency even in the rear region BA of the bowl portion 5.

<Outline configuration of rim waterway>
The schematic configuration of the rim water passage 11 will be described with reference to FIG. FIG. 3 is an explanatory diagram of the rim water passage 11. Note that FIG. 3 schematically shows a cross section of the flow path of the rim water passage 11 at the front portion (for example, the front end portion) of the bowl portion 5 on the right side in the drawing, and the rear portion (for example) of the bowl portion 5 on the left side in the drawing. For example, the cross section of the flow path of the rim water passage 11 at the rear end portion) is schematically shown.

As shown in FIG. 3, and as described above, the rim water passage 11 is formed in the rim portion 10. The rim water passage 11 has a shelf portion 13 that guides the washing water to swirl in the upper part of the bowl portion 5. In the rim water passage 11, the shelf portion 13 is used as the bottom surface, the rim outer wall portion 12a of the rim portion 10 is used as one (outer) side surface, the rim upper wall portion 12b is used as the upper surface, and the rim inner wall portion 12c is used as the other (inner side) side surface. It forms a space (space inside the rim) S surrounded by.

In the rim internal space S, the slit opening 14 (see FIG. 1) is open. Therefore, a straight line connecting the tip of the rim inner wall portion 12c to the tip of the shelf portion 13 is defined as one side of the rim internal space S.

Of the rim internal space S, in the rim internal space S1 in the front portion of the bowl portion 5, the width of the rim upper wall portion 12b forming the rim internal space S1 is D1, and the width of the shelf portion 13 is D2. Further, in the rim internal space S2 in the rear portion of the bowl portion 5 of the rim internal space S, the width of the rim upper wall portion 12b forming the rim internal space S2 is d1, and the width of the shelf portion 13 is d2.

The relationship between the widths of the rim upper wall portion 12b is D1> d1, and the width of the rim upper wall portion 12b gradually decreases from D1 to d1 from the front portion to the rear portion of the bowl portion 5. Further, the relationship of the width of the shelf portion 13 is D2> d2, and the width of the shelf portion 13 also gradually decreases from D2 to d2 from the front portion to the rear portion of the bowl portion 5. The width of the shelf portion 13 may be d2 = 0 at the rear portion of the bowl portion 5.

As described above, since the width of the rim upper wall portion 12b and the width of the shelf portion 13 decrease from the front portion to the rear portion of the bowl portion 5, the cross-sectional area of the rim internal space S is in front of the bowl portion 5. It gradually becomes smaller from the part to the rear. It is preferable that the cross-sectional area of the rim internal space S is continuously reduced.

<Example of rim waterway configuration>
Next, a configuration example of the rim water passage 11 will be described. First, the configuration of the rim water passage 11 on the left side of the bowl portion 5 will be described with reference to FIGS. 4 and 5A to 5C. FIG. 4 is a diagram showing a cross-sectional portion from the left side portion to the rear portion of the bowl portion 5. 5A is a sectional view taken along line B1-B1 in FIG. 4, FIG. 5B is a sectional view taken along line B2-B2 in FIG. 4, and FIG. 5C is a sectional view taken along line B3-B3 in FIG. Note that FIGS. 5A to 5C show a schematic cross section of the rim portion 10.

Here, as shown in FIG. 4, a cross-sectional shape cut at three points on the left side of the drawing in the bowl portion 5 of the toilet bowl main body 2 will be described.

As shown in FIG. 5A, the cross-sectional shape of the rim water passage 11 along the left-right direction on the left side portion of the bowl portion 5 as shown by the B1-B1 line in FIG. 4 is as shown in the rim outer wall portion 12a and the rim upper wall portion 12b. It is formed by the rim inner wall portion 12c and the shelf portion 13.

Further, the cross-sectional shape of the rim water passage 11 at the portion behind the B1-B1 line on the left side of the bowl portion 5 as shown by the B2-B2 line in FIG. 4 (that is, the cross-sectional shape of the washing water flow path in the rim water passage 11). ) Is smaller than the rim outer wall portion 12a, the rim upper wall portion 12b smaller than the rim upper wall portion 12b shown in FIG. 5A, the rim inner wall portion 12c, and the shelf portion 13 shown in FIG. 5A, as shown in FIG. 5B. It is formed by the shelf portion 13. Therefore, the cross-sectional area of the rim internal space S shown in FIG. 5B is smaller than the cross-sectional area of the rim internal space S shown in FIG. 5A.

Further, as shown in FIG. 5C, the cross-sectional shape of the rim water passage 11 along the front-rear direction at the rear portion of the bowl portion 5 as shown by the line B3-B3 in FIG. 4 is the rim outer wall portion 12a and the rim shown in FIG. 5B. It is formed by a rim upper wall portion 12b and a rim inner wall portion 12c that are narrower than the upper wall portion 12b. Since the width of the shelf portion 13 is "0" at this position, the width of the shelf portion 13 is smaller than that of the shelf portion 13 shown in FIG. 5B. Therefore, the cross-sectional area of the rim internal space S shown in FIG. 5C is smaller than the cross-sectional area of the rim internal space S shown in FIG. 5B.

As described above, the width of the rim upper wall portion 12b and the width of the shelf portion 13 become smaller from the side portion to the rear portion of the bowl portion 5. Therefore, the cross-sectional area of the rim internal space S gradually decreases from the side portion to the rear portion of the bowl portion 5.

Here, the mode of the flow of the washing water W2 flowing in the rim water passage 11 will be described with reference to FIG. FIG. 6 is a schematic diagram showing an aspect of the flow of the washing water W2 flowing through the rim water passage 11. In FIG. 6, the cross section of the flow path of the rim water passage 11 in the front portion (for example, the front end portion) of the bowl portion 5 is shown on the right side in the drawing, and the rear portion (for example, the rear portion) of the bowl portion 5 is shown on the left side in the drawing. The cross section of the flow path of the rim water passage 11 at the end) is shown.

As shown in FIG. 6 (left side), since the front part of the bowl part 5 is in the first stage of toilet bowl washing, even if the washing water W2 flows down from the slit opening 14, a relatively large amount of water flows into the rim water passage 11. Washing water W2 flows. In this case, a relatively large amount of wash water W2 flowing through the rim water passage 11 exists so as to occupy substantially the entire rim internal space S.

As shown in FIG. 6 (right side), since the rear part of the bowl part 5 is the latest stage of toilet bowl washing, the washing water W2 continues to flow down from the slit opening 14 until reaching the rear part of the bowl part 5. A small amount of washing water W2 flows through the rim water passage 11. However, at the rear portion of the bowl portion 5, the cross-sectional area of the rim internal space S is small. In this case, the small amount of washing water W2 flowing through the rim water passage 11 generates a downward component (cleaning water W21) and an upward component (cleaning water W22) in the rim internal space S. The wash water W2 is vertically distributed by the air layer Ar.

That is, in the rear part of the bowl portion 5, the washing water W2 is distributed almost entirely in the upper part of the rim internal space S, and the flow velocity of the washing water W2 flowing down from the rim opening 14 is also increasing. Therefore, even the upper wall portion 12b of the rim can be strongly cleaned, and the rear region BA of the bowl portion 5 where the cleaning power is reduced can also be strongly cleaned.

Next, the configuration of the rim water passage 11 on the right side of the bowl portion 5 will be described with reference to FIGS. 7 and 8A to 8D. FIG. 7 is a diagram showing a cross-sectional portion from the rear portion to the side portion on the right side of the bowl portion 5. 8A is a sectional view taken along line C1-C1 in FIG. 7, FIG. 8B is a sectional view taken along line C2-C2 in FIG. 7, FIG. 8C is a sectional view taken along line C3-C3 in FIG. 7, and FIG. 8D is a sectional view taken along line C4 in FIG. -C4 line sectional view. 8A to 8D show a schematic cross section of the rim portion 10.

Here, as shown in FIG. 7, a cross-sectional shape cut at four points on the right side of the drawing in the bowl portion 5 of the toilet bowl main body 2 will be described. The C1-C1 line shown in FIG. 7 is at the same position as the B3-B3 line shown in FIG.

The cross-sectional shape of the rim water passage 11 along the front-rear direction at the rear portion of the bowl part 5 of the bowl part 5 as shown by the C1-C1 line in FIG. 7 (that is, the cross-sectional shape of the washing water flow path in the rim water passage 11) is As shown in FIG. 8A, the cross-sectional shape of the rim water passage 11 along the left-right direction on the left side is formed by the rim outer wall portion 12a, the rim upper wall portion 12b, and the rim inner wall portion 12c. The width of the shelf portion 13 is "0" at this position.

Further, as shown in FIG. 8B, the cross-sectional shape of the rim water passage 11 at the portion in front of the C1-C1 line on the right side of the bowl portion 5 as shown by the C2-C2 line in FIG. 7 is the rim outer wall portion 12a. It is formed by a rim upper wall portion 12b that is larger than the rim upper wall portion 12b shown in FIG. 8A, a rim inner wall portion 12c, and a shelf portion 13 that is larger than the shelf portion 13 shown in FIG. 8A. Therefore, the cross-sectional area of the rim internal space S shown in FIG. 8B is smaller than the cross-sectional area of the rim internal space S shown in FIG. 8A.

Further, as shown in FIG. 8C, the cross-sectional shape of the rim water passage 11 at the portion in front of the C2-C2 line on the right side of the bowl portion 5 as shown by the C3-C3 line in FIG. 7 is the rim outer wall portion 12a. It is formed by a rim upper wall portion 12b that is larger than the rim upper wall portion 12b shown in FIG. 8B, a rim inner wall portion 12c, and a shelf portion 13 that is larger than the shelf portion 13 shown in FIG. 8B. Therefore, the cross-sectional area of the rim internal space S shown in FIG. 8C is smaller than the cross-sectional area of the rim internal space S shown in FIG. 8B.

Further, as shown in FIG. 8D, the cross-sectional shape of the rim water passage 11 along the left-right direction on the right side portion of the bowl portion 5 as shown by the C4-C4 line in FIG. 7 is shown in the rim outer wall portion 12a and FIG. 8C. It is formed by a rim upper wall portion 12b that is larger than the rim upper wall portion 12b, a rim inner wall portion 12c, and a shelf portion 13 that is larger than the shelf portion 13 shown in FIG. 8C. Therefore, the cross-sectional area of the rim internal space S shown in FIG. 8D is smaller than the cross-sectional area of the rim internal space S shown in FIG. 8C.

As described above, the width of the rim upper wall portion 12b increases from the rear portion of the bowl portion 5 toward the side portion in front of the bowl portion 5. Therefore, the cross-sectional area of the rim internal space S gradually increases from the rear portion to the side portion of the bowl portion 5. As a result, the small amount of washing water W2 that goes around the rear portion of the bowl portion 5 can be directed further forward. Further, the width of the shelf portion 13 increases from the rear portion of the bowl portion 5 toward the side portion (water discharge port 10a) in front of the bowl portion 5. Therefore, the cross-sectional area of the rim internal space S gradually increases from the rear portion to the side portion of the bowl portion 5. As a result, the small amount of washing water W2 that goes around the rear portion of the bowl portion 5 can be directed further forward.

In the region from C3-C3 line to C4-C4 line shown in FIG. 7, the washing water discharged from the washing water discharge port 10a (both refer to FIG. 1) guided to the headrace 6 is a shelf. Since it is a region for promoting turning running on the portion 13 and also a region for rectifying the washing water on the shelf portion 13, the width of the shelf portion 13 may be set wider.

As described above, according to the flush toilet bowl 1 according to the embodiment, in the rear region BA of the bowl portion 5 to which dirt easily adheres, the cross-sectional area of the rim internal space S from the side portion to the rear portion of the bowl portion 5 Therefore, even if the amount of washing water is reduced in the process of swirling the washing water W2, the washing water W2 can be distributed over the entire rim internal space S, and the entire rim internal space S can be washed. .. Therefore, even the rim upper wall portion 12b can be strongly cleaned.

Further, since the cross-sectional area of the rim internal space S becomes smaller from the side portion of the bowl portion 5 toward the rear portion, the flow velocity of the swirling washing water W2 increases, and the slit opening is also strong in the rear region BA of the bowl portion 5. The washing water W2 can be allowed to flow down from 14. Therefore, the bowl portion 5 can be strongly washed even in the rear region BA.

Further, since the width of the shelf portion 13 becomes smaller toward the rear portion of the bowl portion 5, the cross-sectional area of the rim internal space S becomes smaller toward the rear portion of the bowl portion 5. As a result, the washing water flowing on the shelf portion 13 is sufficiently supplied to each of the upper side of the rim internal space S and the slit opening portion 14. Thereby, it is possible to realize the cleaning of the rim internal space S and the cleaning of the rear region BA of the bowl portion 5.

Further, since the width of the rim upper wall portion 12b becomes smaller toward the rear portion of the bowl portion 5, the region where dirt easily adheres becomes smaller. Further, since the cross-sectional area of the rim internal space S becomes smaller toward the rear portion of the bowl portion 5, the washing water can be sufficiently supplied to the upper portion of the rim internal space S, that is, the rim upper wall portion 12b.

Further, since the rim internal space S increases from the rear portion to the front portion of the bowl portion 5, the washing water W2 occupying the rim internal space S is introduced from the slit opening 14 in accordance with the expansion of the rim internal space S. It can be made to flow down. Therefore, the washing water can flow down to the rear region BA of the bowl portion 5 with the water force strengthened.

Further, since the small amount of washing water W2 that goes around the rear part of the bowl portion 5 can be directed further forward, the washing water is used to wash the rim internal space S and the rear region BA of the bowl portion 5. The bowl portion 5 can be reliably swiveled around.

Further, the washing water W2 in the upper part of the rim internal space S can be allowed to flow down. This makes it easier for the wash water W2 to flow down in the rear region BA of the bowl portion 5.

In the above-described embodiment, the flush toilet bowl 1 (toilet bowl main body 2) is a wall-mounted type, but is not limited to this, and may be, for example, a floor-standing type. In this case, the discharge port 9 is arranged immediately below, for example, the descending pipe line 83.

Further, in the above-described embodiment, it has been stated that the cross-sectional area of the rim internal space S preferably decreases continuously toward the rear portion of the bowl portion 5, but the present invention is not limited to this, and for example, the rim internal space S of the rim internal space S. The cross-sectional area may be gradually reduced.

Further effects and variations can be easily derived by those skilled in the art. For this reason, the broader aspects of the invention are not limited to the particular details and representative embodiments described and described above. Thus, various modifications can be made without departing from the spirit or scope of the overall concept of the invention as defined by the appended claims and their equivalents.

1 Washing toilet 2 Toilet bowl body 5 Bowl part 10 Rim part 10a Spout 11 Rim waterway 12a Rim outer wall part 12b Rim upper wall part 12c Rim inner wall part 13 Shelf part 14 Slit opening S Rim internal space

Claims (6)

A flush toilet that cleans the body of the toilet with wash water.
The bowl part that receives filth and
A rim portion formed on the upper part of the bowl portion and having a rim outer wall portion, a rim upper wall portion, and a rim inner wall portion,
A rim drainage channel formed in the rim portion and having a shelf portion that guides the washing water to swirl in the upper part of the bowl portion.
A spout that discharges wash water toward the rim water passage, and
It is provided with a slit opening for flowing wash water from the rim water passage.
The rim portion has a rim internal space surrounded by the rim outer wall portion, the rim upper wall portion, the rim inner wall portion, and the shelf portion, and the cross-sectional area of the rim internal space is from the side portion of the bowl portion. A flush urinal that is characterized by becoming smaller toward the rear. The flush toilet according to claim 1, wherein the shelf portion has a width that becomes smaller toward the rear portion of the bowl portion. The flush toilet according to claim 1 or 2, wherein the upper wall portion of the rim becomes smaller in width toward the rear portion of the bowl portion. The water-washing toilet according to any one of claims 1 to 3, wherein the rim internal space is formed so that the cross-sectional area increases from the rear portion to the front portion of the bowl portion. The flush toilet according to claim 4, wherein the shelf portion has a width increasing from the rear portion to the front portion of the bowl portion. The flush toilet according to claim 4, wherein the rim upper wall portion has a width increasing from the rear portion to the front portion of the bowl portion.

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