JP2013044176A - Flush toilet bowl - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flush toilet bowl capable of reliably washing a toilet bowl while preventing a washing failure due to the insufficient swirl of washing water.SOLUTION: The flush toilet bowl includes a bowl part 8 having a bowl-shaped sewerage receiving surface 14, a rim portion 16 formed at the upper edge, and a shelf portion 18 formed between the rim portion 16 and the sewerage receiving surface 14, a drain trap pipeline having an inlet 12a connected to the lower side of the bowl part 8 for discharging sewerage, a rim discharge port 26 for discharging washing water onto the shelf portion 18 of the bowl part 8 to form a swirl flow, and a rim headrace 10d for supplying the washing water to the rim discharge port 26, the bowl part 8 having a front side region F and a rear side region R, the rim portion 16 of the bowl part 8 having a curvature radius ρ1 in the front side region smaller than a curvature radius ρ3 in the rear side region, the rim discharge port 26 being formed on one of the right and left sides in the front side region of the rim portion 16 to discharge the washing water to the front side so that the discharged washing water swirls from the front side region of the rim portion 16 through a front end 16a and then to the rear side region.

Description

  The present invention relates to a flush toilet, and more particularly to a flush toilet that flushes toilets with wash water supplied from a wash water supply source and discharges filth.

  Conventionally, as a flush toilet that cleans a toilet and discharges filth, as described in Patent Document 1, in order to clean a relatively dirty rear surface in the bowl of the toilet, the front and rear direction of the bowl A water outlet is provided at one position in the middle or rear of the water outlet, and the direction of the water outlet is adjusted so that the wash water discharged from the water outlet passes through the rear surface of the bowl and then turns to the front of the bowl. What is set is known.

  Further, as described in Patent Document 2, a water outlet is provided on one of the left and right sides in the front region in the bowl portion of the toilet bowl, and the water discharge direction of the water outlet is directed rearward so that A flush toilet that cleans the face is also known.

  Furthermore, as described in Patent Document 3, a flush toilet is also known in which a water discharge port is provided at the front end portion in the bowl portion of the toilet, and the washing water is discharged toward the rear surface portion of the bowl portion. Yes.

JP 2010-255316 A JP 2000-265525 A JP 2007-314975 A

  However, in the conventional flush toilets described in Patent Documents 1 to 3 described above, the cleaning performance for cleaning the relatively dirty rear surface portion in the bowl portion of the toilet bowl is improved, but water is discharged from the spout. When the cleaning water is swirled to the front part of the bowl part after cleaning the rear part of the bowl part, when the water reaches the front part of the bowl part, the water of the cleaning water is washed when it passes through the rear part of the bowl part. It is in a weakened state compared to the water force. Furthermore, because of the bowl part shape in which the radius of curvature of the front part of the bowl part is equal to or smaller than the radius of curvature of the rear part of the bowl part, the flow of cleaning water passing through the front part of the bowl part is Since energy loss is also greater than when passing through the bowl, there is a problem in that the front portion of the bowl portion is poorly cleaned due to insufficient rotation of the cleaning water. In particular, as the amount of water used for cleaning inside the bowl has been significantly reduced with the recent savings in water, it is an issue that must be overcome quickly due to poor cleaning due to insufficient rotation of the water in the bowl. It has become.

  Therefore, the present invention has been made to solve the above-described problems of the prior art, and provides a flush toilet that can prevent washing failure due to insufficient rotation of washing water and can perform reliable toilet flushing. The purpose is that.

In order to achieve the above-described object, the present invention is a flush toilet that flushes toilets with washing water supplied from a washing water source and discharges wastes, and has a bowl-shaped waste receiving surface and an upper edge. A bowl portion provided with a formed rim portion, a shelf portion formed between the rim portion and the filth receiving surface, and a drainage channel having an inlet connected to the bottom of the bowl portion to discharge the filth. And a water discharge part that spouts wash water onto the shelf of the bowl part to form a swirling flow, and a water conduit that supplies the wash water to the water discharge part. A rim portion of the bowl portion, the radius of curvature of the front side region is equal to or smaller than the radius of curvature of the rear side region, and the water discharge portion is any of the left and right in the front side region of the rim portion. It is formed on one side, the washing water is spouted forward, and this spouted washing There has been characterized by being adapted after passing through the front end from the front region of the rim portion to pivot to the rear region.
In the present invention configured as described above, the water discharge portion is formed on either one of the left and right sides in the front region of the rim portion, and the wash water is discharged forward, and the discharged wash water is the rim. After passing through the front end from the front area of the part, it turns to the rear side area, so that the washing water with water discharged from the water discharge part first passes through the front end of the rim part with a small radius of curvature. Therefore, it is possible to prevent the cleaning water from turning in the region on the front side of the rim portion and causing poor cleaning. Furthermore, since it can turn in the state which maintained the comparatively strong water force to the back side area | region of a rim | limb part, the back side area | region of the bowl part which is easy to get dirty can also be wash | cleaned reliably.

In the present invention, preferably, the bowl portion is formed such that the front end of the rim portion has a minimum radius of curvature in the entire circumference of the rim portion, and the water discharge portion is formed in the front side region of the rim portion. It is formed behind the front end.
In the present invention configured as described above, the water discharge portion is formed behind the front end of the rim portion in the front region formed with the minimum radius of curvature, so the wash water discharged from the water discharge portion Can be swiveled to the rear side region of the rim portion after passing through the front end of the rim portion while maintaining a relatively strong water force. It is possible to prevent the cleaning from being poorly performed without being able to turn. Moreover, since it can turn in the state which maintained the comparatively strong water force to the back side area | region of a rim | limb part, the back side area | region of the bowl part which is easy to get dirty can also be wash | cleaned reliably.

In the present invention, preferably, the water discharge portion is adjacent to one of the left and right sides of the front end of the rim portion and changes from a large radius of curvature to a small radius of curvature in the front region of the rim portion of the bowl portion. It is formed in the part.
In the present invention configured as described above, the water discharge portion is adjacent to one of the left and right sides of the front end of the rim portion in the region on the front side of the rim portion of the bowl portion, and has a small radius of curvature from a large radius of curvature. Since the water that has been discharged from the water discharge section maintains a strong water flow, it immediately reaches the front end of the rim section, and then turns to the rear area of the rim section. Therefore, it is possible to prevent the cleaning water from turning at the front end of the rim portion having the minimum radius of curvature and causing a cleaning failure. Moreover, since it can turn in the state which maintained comparatively strong water force enough to the back side area | region of a rim | limb part, the back side area | region of the bowl part which is easy to get dirty can also be wash | cleaned more reliably.

In the present invention, preferably, in the bowl portion, most of the rear side region of the rim portion forms a part of a perfect circle having a predetermined radius.
In the present invention configured as described above, most of the rear side region of the rim portion of the bowl portion forms a part of a perfect circle having a predetermined radius. Since the radius of curvature (radius) does not change for the most part, energy loss of the washing water when passing through the rear side region of the rim portion can be suppressed, and the washing water can be swirled more reliably. Moreover, since it can turn in the state which maintained the comparatively strong water force to the back side area | region of a rim | limb part, the back side area | region of the bowl part which is easy to get dirty can also be wash | cleaned reliably.

In the present invention, preferably, the rim portion of the bowl portion has an inner peripheral surface formed in a shape overhanging inward near the front end of the rim portion, and in a substantially vertical direction except near the front end of the rim portion. It is formed in a shape that stands up.
In the present invention configured as described above, the inner peripheral surface of the rim portion of the bowl portion is formed in a shape overhanging inward near the front end of the rim portion, and is substantially vertical except near the front end of the rim portion. Since it is formed in a shape that rises in the direction, there is no occurrence of water splashing to the outside of the toilet near the front end of the rim portion with the smallest radius of curvature, so the water flow of the wash water discharged from the water discharge portion is increased. be able to. Therefore, it is possible to prevent the cleaning water from turning around in the vicinity of the front end of the rim portion having a small radius of curvature, resulting in poor cleaning. Moreover, since it can turn in the state which maintained comparatively strong water force enough to the back side area | region of a rim | limb part, the back side area | region of the bowl part which is easy to get dirty can also be wash | cleaned more reliably. Furthermore, since the inner peripheral surface of the rim portion of the bowl portion is formed in a shape that rises substantially vertically except in the vicinity of the front end, even if dirt is attached, it can be easily wiped off and the cleaning property can be improved. .

In the present invention, preferably, the water discharge portion is formed on the upper end side of the rim portion of the bowl portion.
In the present invention configured as described above, since the water discharge portion is formed on the upper end side of the rim portion of the bowl portion, the wash water discharged from the water discharge portion at a relatively high position of the rim portion has a radius of curvature. In order to form a flow (swirl flow) swirling toward the rear side of the rim portion through the vicinity of the front end of the small rim portion, and forming a flow descending from the upper end side of the rim portion (down flow), these Due to the swirling flow and the descending flow, it is possible to reliably clean a wide area of the inner peripheral surface of the overhang shape formed near the front end of the rim portion of the bowl portion where dirt easily remains.

In the present invention, preferably, the water discharge portion includes a water discharge port, and an upper-hanging portion of the upper surface of the water discharge port and the inner peripheral surface of the rim portion are continuously formed.
In the present invention configured as described above, since the overhanging portion of the upper surface of the water discharge port of the water discharge portion and the inner peripheral surface of the rim portion is formed continuously, it is disposed on the upper end side of the rim portion. The wash water spouted from the spout of the spout at the higher position flows smoothly along the inner peripheral surface of the rim, and a swirling flow and a downward flow passing near the front end of the rim with a small curvature radius are formed. Therefore, it is possible to reliably clean a wide area of the overhang-shaped inner peripheral surface formed near the front end of the rim portion of the bowl portion where dirt easily remains.

In the present invention, preferably, in the water discharge portion, the edge portion of the water discharge port is inclined upward from below toward the water discharge direction.
In the present invention configured as described above, the rim portion of the water discharge port of the water discharge unit is inclined upward from below toward the water discharge direction, so the wash water discharged from the water discharge port of the water discharge unit is The rim portion inclined upward from the rim portion forms a flow (swirl flow) that passes through the vicinity of the front end of the rim portion having a small radius of curvature and turns to the rear side of the rim portion, and descends from the upper end side of the rim portion. A flow (downflow) is formed, and the swirling flow and the downflow can reliably clean the vicinity of the front end of the rim portion of the bowl portion.

  According to the flush toilet of the present invention, it is possible to prevent poor cleaning due to insufficient rotation of the wash water and perform reliable toilet cleaning.

It is a schematic perspective view which shows the flush toilet bowl by one Embodiment of this invention. It is side surface sectional drawing of the state which abbreviate | omitted the toilet seat and the toilet lid in the flush toilet bowl by one Embodiment of this invention. It is a top view which shows the toilet bowl main body from the flush toilet bowl by one Embodiment of this invention. It is sectional drawing seen along the IV-IV line of FIG. It is sectional drawing seen along the VV line of FIG. It is sectional drawing seen along the VI-VI line of FIG. It is sectional drawing seen along the VII-VII line of FIG. It is a perspective view which shows the whole water conduit of the flush toilet by one Embodiment of this invention. It is the expansion perspective view which looked at the rim spout of the front side area | region in the bowl part of the flush toilet bowl by one Embodiment of this invention from the back side diagonally downward. It is the elements on larger scale which expanded the front part of the flush toilet by one Embodiment of this invention shown in FIG. It is the elements on larger scale which expanded the rim spout part of the flush toilet according to one Embodiment of this invention shown in FIG. It is a side view which shows the toilet bowl main body of the state before the adhesion process in the flush toilet bowl by one Embodiment of this invention. It is front sectional drawing which shows the toilet bowl body of the state before the adhesion process in the flush toilet bowl by one Embodiment of this invention. 1 schematically shows a first turning trajectory and a second turning trajectory of the first lap of rim water spouting when rim cleaning is performed after the start of zet cleaning in a flush toilet according to an embodiment of the present invention. It is a perspective view explaining. It is a perspective view explaining roughly the state where the swirling flow of rim water spouting is flowing down into the crevice in flush toilet by one embodiment of the present invention. (A) of FIG. 16 shows an example of the result of analyzing the flow velocity distribution regarding the rim water discharge and the jet water discharge when toilet flushing is performed using the flush toilet according to one embodiment of the present invention. FIG. 16 (b) is a comparative example of the analysis result shown in FIG. 16 (a), and analyzes the flow velocity distribution regarding rim water discharge and zet water discharge when toilet flushing is performed using a conventional flush toilet. The results are shown. (A) of FIG. 17 shows an example of the result of analyzing the flow velocity distribution and the state of the flow regarding the jet water discharge when toilet flushing is performed using the flush toilet according to one embodiment of the present invention. Moreover, (b) of FIG. 17 shows the flow velocity distribution and the state of the flow regarding the jet water discharge when toilet flushing is performed using a conventional flush toilet as a comparative example of the analysis result shown in (a) of FIG. The analysis result is shown.

Hereinafter, a flush toilet according to an embodiment of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic perspective view showing a toilet seat of a flush toilet according to an embodiment of the present invention.
As shown in FIG. 1, a flush toilet 1 according to an embodiment of the present invention is a so-called flush-type flush toilet in which filth is washed away by flowing water due to a drop of water in a bowl portion. The main body 2, the toilet lid 4 covering the toilet seat (not shown) disposed on the upper surface of the toilet body 2, and the toilet body attached to the rear part of the toilet body 2 for storing flush water used for toilet flushing And a gravity water supply type water storage tank 6 which is a source of cleaning water for supplying water to the water tank 2.
The washing water source for supplying the washing water to the toilet body 2 is not limited to a tank type such as the gravity water supply water storage tank 6 shown in the present embodiment, but directly uses tap water supply pressure. A direct water supply type, a flush valve type, or a supply of cleaning water using the supplementary pressure of a pump may be used.

FIG. 2 is a side sectional view of the flush toilet according to the embodiment of the present invention with the toilet seat and the toilet lid omitted, and FIG. 3 is a plan view showing the flush toilet according to the embodiment of the present invention.
As shown in FIGS. 2 and 3, a bowl portion 8 is formed at the upper front portion of the toilet body 2. In addition, a water conduit 10 for discharging the wash water supplied from the water storage tank 6 to the bowl portion 8 is formed in the rear upper part of the toilet body 2.
Furthermore, a drain trap pipe 12, which is a drain path for discharging filth in the bowl section 8, is formed below the bowl section 8.

  The bowl portion 8 includes a bowl-shaped waste receiving surface 14, a rim portion 16 formed along the upper edge of the bowl portion 8, and a shelf portion formed between the waste receiving surface 14 and the rim portion 16. 18 is provided.

Further, the bowl portion 8 includes a concave portion 20 formed in a region below the filth receiving surface 14 and connected to the drain trap pipe 12, and the concave portion 20 includes a bottom surface 20a and the bottom surface 20a and the filth receiving surface. 14 is provided with a wall surface 20b for connecting the lower edge portion 14a to the lower wall portion 14a.
Further, a zette spouting port 22 is formed on the left side wall surface 20b of the recess 20 when viewed from the front side of the toilet body 2 with respect to a center line A1 (see FIG. 3) that bisects the horizontal direction of the bowl portion 8. The jet outlet 22 is connected to a jet conduit 10b branched from a common conduit 10a of the conduit 10 to be described later in detail, and the main flow of the wash water discharged from the jet outlet 22 is within the recess 20. It is designed to turn. Thereby, when washing water is discharged from the jet outlet 22, the swirling flow f <b> 4 of the jet discharge makes it difficult for the accumulated water in the recessed portion 20 of the bowl portion 8 to spread outward, and the floating filth is stored in the recessed portion 20. It can be collected in the middle of the center and discharged reliably. Further, when cleaning water is about to jump out of the concave portion 20 of the bowl portion 8, the water generated by the swirling rim water discharged from the rim water spouting port 26, which will be described later, flows down and collides with the bowl portion 8. Splashing can be more effectively suppressed.

  In addition, an inlet 12a of the drain trap pipe 12 described above is opened behind and below the concave portion 20 of the dirt receiving surface 14 of the bowl portion 8, and an ascending path 12b extends rearward from the inlet 12a. A descending path 12c is continuous with the ascending path 12b, and a lower end of the descending path 12c is connected to a discharge pipe (not shown) under the floor via a drain socket 24.

  In the flush toilet 1 of the present embodiment, a floor drainage flush toilet in which the lower end of the descending passage 12c of the drain trap pipe 12 is connected to a discharge pipe (not shown) below the floor will be described as an example. However, the present invention is not limited to such a configuration, and the present invention can be applied to a flush toilet of the floor drainage type in which the end of the descending passage 12c is disposed on the rear wall side of the flush toilet and connected to the discharge pipe on the floor. It is.

Below, with reference to FIGS. 2-8, the water conduit 10 of the flush toilet 1 is demonstrated in detail.
4 to 7 are cross-sectional views taken along lines IV-IV, VV, VI-VI, and VII-VII in FIG. 3, respectively. FIG. It is a perspective view which shows the whole water conduit of the flush toilet bowl by one Embodiment.
As shown in FIGS. 2 to 8, the water conduit 10 includes a common water conduit 10 a extending from the inlet 10 c connected to the drain 6 a of the water storage tank 6 to the vicinity of the back side of the bowl 8, and the common water conduit 10. The bowl portion 8 includes a zette water conduit 10b and a rim water conduit 10d that branch in the vicinity of the back surface side.

  The rim water guide channel 10d branches from the common water guide channel 10a in the vicinity of the back surface side of the bowl portion 8, and the front side of the toilet body 2 with respect to a center line A1 (see FIG. 3) that bisects the horizontal direction of the bowl portion 8. A single rim spout that extends forward along the inside of the rim portion 16 that is located on the left side when viewed from the front and is disposed on the left side when viewed from the front side of the toilet body 2 in the front region F of the rim portion 16 26 (details will be described later).

The zette water conduit 10b is branched from the common water conduit 10a in the vicinity of the back side of the bowl portion 8, and the front side of the toilet body 2 with respect to a center line A1 (see FIG. 3) that bisects the horizontal direction of the bowl portion 8. As viewed from above, the bowl portion 8 extends forward so as to bypass the outside of the left side wall surface 20b of the recess 20 and extends to the jet spout 22 formed on the left side wall surface 20b of the recess 20. When the bowl portion 8 is equally divided in the front-rear direction and the left-right direction, the zette water discharge port 22 is disposed on the rear side with respect to the rim water discharge port 26 of the rim portion 16 and on the left side when the bowl portion 8 is viewed from the front. ing.
Note that the rim water spouting port 26 and the jet water spouting port 22 may be formed on the same side of either one of the left and right sides of the bowl portion 8.
Further, since the rim water spouting port 26 is formed in front of the jet water spouting port 22, a swirling flow (“oblique swirling flow f 4” to be described later) discharged from the zet water discharging port 22 is generated in the bowl portion 8. Even if it protrudes from the inside of the recess 20 to the outside, it can be suppressed by the momentum of the swirling flow of the cleaning water discharged from the rim water discharge port 26 ("swirling flow f5" described later).

Furthermore, before the rim water discharge from the common water channel 10a through the rim water channel 10d to the rim water outlet 26 starts the rim water discharge of the cleaning water, the water is introduced from the common water channel 10a through the Zet water channel 10b to the Zet water outlet 22. As a means for setting the timing of water discharge so that the jet water discharge of the washed water starts, the path length L1 of the rim water conduit 10d is set to be longer than the path length L2 of the jet water conduit 10b. ing. By setting in this way, the air present in the common conduit 10a at the start of cleaning can be extracted from the jet outlet 22 through the jet conduit 10b, and the rim outlet 26 Thus, the air discharged from the rim water spouting port 26 when water discharge is started can be reduced with a simple structure. Further, it is possible to prevent the discharge sound and water splashing that occur when the air flowing together with the cleaning water from the common conduit 10a to the rim conduit 10d is compressed in the rim conduit 10d and discharged from the rim spout 26, It is possible to prevent water from splashing outside the toilet 1.
Further, even if the water compressed when the compressed air in the jet water passage 10b is discharged together with the washing water at the jet water discharge port 22, the jet water discharge port 22 is located in the lower part of the bowl portion 8, that is, the filth receptacle. Since it is located in the side wall surface 20b of the recessed part 20 between the surface 14 and the drain trap pipe 12, the water splash to the exterior of the toilet 1 can be prevented.
Furthermore, even if the air existing in the common conduit 10a at the start of cleaning is mixed into the cleaning water flowing from the common conduit 10a to the rim conduit 10d, the rim spout 26 is in the front region F of the bowl portion 8. Since it is formed, the rim conduit 10d is a relatively long route extending from the vicinity of the back side of the bowl portion 8 of the common conduit 10a to the rim spout 26, so that there is sufficient air while flowing through the rim conduit 10d. Therefore, the discharge sound and water splashing generated when water is discharged from the rim water discharge port 26 are suppressed.

In the present embodiment, as an example of means for starting the jet water discharge before the rim water discharge starts, the path length L1 of the rim water conduit 10d is longer than the path length L2 of the jet water conduit 10b. However, the present invention is not limited to such a form, and the flow velocity and volume in the rim conduit and the jet conduit are adjusted so that the jet water discharge is started before the start of the rim water discharge. May be.
Moreover, you may provide the pipe member which connects the common water flow path 10a and the inside of the recessed part 20 as a means for extracting the air in the common water flow path 10a instead of the jet conduit 10b.

Next, with reference to FIGS. 3, 5 to 7, and 9 to 11, the rim portion 16, the shelf portion 18, and the rim spout 26 of the bowl portion 8 of the flush toilet 1 will be described in detail.
FIG. 9 is an enlarged perspective view of the rim spout in the front region in the bowl portion of the flush toilet according to one embodiment of the present invention as seen obliquely from the rear side, and FIG. 10 is an embodiment of the present invention shown in FIG. FIG. 11 is a partially enlarged plan view in which the front portion of the flush toilet is enlarged, and FIG. 11 is a partially enlarged perspective view in which the rim spout portion of the flush toilet according to the embodiment of the present invention shown in FIG. 2 is enlarged.
As shown in FIGS. 3 and 10, the bowl portion 8 has a front side region F in which the bowl portion 8 is equally divided in the front-rear direction by a center line A <b> 2 (see FIG. 3) extending in the left-right direction of the bowl portion 8. And a rear region R.
Further, the front side region F of the bowl portion 8 is disposed symmetrically with respect to the center line A1 and the front end portion 16a (inner peripheral side front end portion 16a) of the inner peripheral surface 17 of the rim portion 16, and includes the front end portion 16a. A region F1, a region F2 positioned on the rear side of the region F1, and a region F3 positioned on the rear side of the region F2 are provided.

The front end portion 16a in the front side region F1 of the rim portion 16 has the smallest radius of curvature ρ1 in the entire circumference of the rim portion 16, and the rim water spouting port 26 is connected to the front end portion 16a in the front side region F1 of the rim portion 16. It is formed in the front side area | region F2 located in the back side rather than, and wash water is discharged toward this front-end part 16a.
That is, the rim spout 26 is disposed in the vicinity of the minimum radius of curvature located at the front end 16a of the rim portion 16, and water is discharged from the rim spout 26 by discharging cleaning water toward the minimum radius of curvature. It is possible to stabilize the water discharge direction vector and the water flow of the washed water, and turn to the rear region R of the rim portion 16 after passing through the front end portion 16a of the rim portion 16 while maintaining a relatively strong water force. Can be done. As a result, the rear side region R of the bowl portion 8 which is easily contaminated can be washed firmly, and the washing water after passing through the rear side region R continues to swivel while maintaining the momentum. Therefore, the front end portion 16a of the rim portion 16 is maintained. It is possible to prevent the vicinity from turning and causing poor cleaning.
In addition, the cleaning water discharged from the rim water discharge port 26 makes a first turn around the rim portion 16 after passing through the minimum radius of curvature of the front end portion 16a of the rim portion 16. Since the flow of the cleaning water flowing down from the rim spout 26 to the shelf 18 is suppressed by the influence of the centrifugal force that acts on the outside of the rim 16 when it passes through the minimum radius of curvature of the Thus, the collision with the swirling flow on the shelf 18 which is about to turn to the second turn can be suppressed.

  Further, the rim spout 26 is adjacent to the left side when viewed from the front side of the toilet body 2 with respect to the front end portion 16a in the front side region F1 of the rim portion 16 of the bowl portion 8, and is curved from the rear toward the front. The radius ρ2 is formed in the front region F2, which is a portion where the radius of curvature changes from a large radius of curvature to a small radius of curvature. As a result, the wash water discharged from the rim spout 26 can immediately reach the front end portion 16a of the rim portion 16 in a state where a strong water force is maintained, and then turn to the rear region R of the rim portion 16. Therefore, it is possible to prevent the cleaning water from turning at the front end portion 16a of the rim portion 16 having the smallest radius of curvature and causing poor cleaning. Furthermore, the wash water discharged from the rim water discharge port 26 toward the front end portion 16a in the front region F1 of the rim portion 16 with a strong water force is in the front region F1 of the rim portion 16 formed by the minimum curvature radius ρ1. Due to the moderate energy loss that occurs when passing through the front end of the water, the water force is moderately suppressed, and the wash water can be prevented from jumping out of the toilet due to the excessive force.

  Further, the rear side region R of the shelf portion 18 of the bowl portion 8 forms a part of a regular circle (arc shape) having a constant radius (curvature radius ρ3). Thereby, since the curvature radius ρ3 (radius of a perfect circle) does not change in most of the rear side region R of the rim portion 16 of the bowl portion 8, the energy of the cleaning water when passing through the rear side region R of the rim portion 16 is changed. Loss can be suppressed, the washing water can be swirled more reliably, and the swirl can be swirled in a state where a relatively strong water force is maintained up to the rear region R of the rim portion 16, The rear region R of the bowl portion 8 that is easily contaminated can also be reliably cleaned. In addition, most of the rear side region R of the rim portion 16 of the bowl portion 8 forms a part of a perfect circle having a predetermined radius (curvature radius ρ3), so that when the user sees from the diagonally upper front, Most of the rear side region R of the rim portion 16 of the bowl portion 8 that is conspicuous forms a part of a perfect circle having a predetermined radius (curvature radius ρ3), so that the overall beauty of the bowl portion 8 is improved. Can be done.

The rim portion 16 of the bowl portion 8 is formed in the front side region F by the curvature radius ρ4 (ρ4 = ρ2> ρ3) which is equal to the curvature radius ρ2 and larger than the curvature radius ρ3 of the rear side region R. An area F3 is provided, and the front area F3 is close to the vicinity of the front end portion 16a in the front area F1, and is disposed between the front area F2 and the rear area R. As a result, the wash water discharged from the rim spout 26 and passed through the front end 16a of the rim 16 passes through the region F2 close to the vicinity of the front end 16a in the front region F1 of the rim 16 of the bowl 8. It flows in a state where a relatively strong water force is maintained in the region F3. This washing water flows through the front side region F3 of the rim part 16 formed by the curvature radius ρ4 larger than the curvature radius ρ3 of the rear side region R of the rim part 16, so that the rim on the front side of the front side region F3. The rim portion 16 can smoothly flow to the rear side region R of the rim portion 16 in a stable state while maintaining a relatively strong water flow from the front side regions F1 and F2 of the portion 16. Even when the inner peripheral surface 17 of the rim 16 rises substantially vertically, the wash water flowing through the rim portion 16 can be prevented from jumping out of the toilet 1.
In the present embodiment, a configuration in which the curvature radius ρ1 of the front region F1 of the rim portion 16 is set to be smaller than the curvature radius ρ3 of the rear region R of the rim portion 16 will be described. However, the curvature radius ρ1 of the front region F1 of the rim portion 16 may be set to be equal to the curvature radius ρ3 of the rear region R of the rim portion 16. Alternatively, at least one of the curvature radii ρ1, ρ2, and ρ4 of the front regions F1, F2, and F3 of the front region F1 of the rim portion 16 is set as the curvature radius ρ3 of the rear region R of the rim portion 16. You may set so that it may become equal.

The upper edge of the rim portion 16 of the bowl portion 8 is locally located from the rim spout 26 in the front region F2 toward the front side to the vicinity of the front end portion 16a in the front region F1 of the rim portion 16. An overhang portion 16b formed in an overhanging shape protruding inward is provided, and the upper portion of the rim spout 26 is covered by the overhang portion 16b.
Further, the rim portion 16 of the bowl portion 8 includes a rising portion 16c having a shape in which the region of the inner peripheral surface 17 other than the overhang portion 16b rises substantially in the vertical direction.
Thus, the front side regions F1 and F2 in the vicinity of the front end portion 16a of the inner peripheral surface 17 of the rim portion 16 are formed in a shape overhanging inward by the overhang portion 16b, and the front end portion 16a of the rim portion 16 is formed. Since the front side region F3 and the rear side region R other than the vicinity are formed in a shape that rises in a substantially vertical direction, the water to the outside of the toilet 1 near the front end portion 16a of the rim portion 16 having the minimum curvature radius ρ1. There is no occurrence of jumping, and the water flow of the wash water discharged from the rim spout 26 can be increased. Moreover, it can turn in the state which maintained the comparatively strong water force enough to the back side area | region R of the rim | limb part 16, and the back side area | region R of the bowl part 16 which is easy to become dirty can also be wash | cleaned more reliably. ing.
Moreover, even if water splashing occurs in the vicinity of the rim spout 26 of the rim portion 16 where water splashes easily occur due to the overhang portions 16b of the front side regions F1 and F2 near the front end portion 16a of the rim portion 16, Since this water splashing hits the upper edge portion of the overhang portion 16b of the rim portion 16, it is possible to prevent water splashing to the outside of the toilet 1.
Furthermore, since the inner peripheral surface 17 of the rim portion 16 of the bowl portion 8 is formed in a shape that rises substantially in the vertical direction except in the vicinity of the front end portion 16a, even if dirt is attached, it is easy to wipe off.
In the flush toilet 1 of the present embodiment, as an example, a configuration in which the inner peripheral surface 17 of the rim portion 16 includes the rising portion 16c will be described. However, instead of the rising portion 16c, the inner periphery of the rim portion is described. It may be set to a shape overhanging substantially the entire circumference of the surface, or a so-called open rim type form in which the inside of the rim conduit formed along the circumferential direction of the rim portion 16 is open. It is good.

Further, the rim spout 26 is located a predetermined distance h higher than the height position of the shelf 18 of the bowl 8 and is formed on the upper end side of the rim 16 of the bowl 8. Thereby, the wash water discharged from the rim water discharge port 26 forms a flow (swirl flow f1) that passes through the vicinity of the front end portion 16a of the rim portion 16 having a small curvature radius and swirls toward the rear side of the rim portion 16. At the same time, a flow descending from the upper end side of the rim portion 16 (downflow f2) is formed, and the inside of the bowl portion 8 can be effectively cleaned by the swirling flow f1 and the downward flow f2. . Further, the vicinity of the front end portion 16a of the rim portion 16 of the bowl portion 8 can be reliably washed with the washing water discharged from the rim water discharge port 26 located at the upper end side of the rim portion 16 at a relatively high position. It is like that.
Further, since the rim spout 26 is formed in the rim 16 above the shelf 18 by a predetermined distance h, the wash water discharged from the rim spout 26 will be described in detail later with reference to FIGS. 14 and 15. However, the swirl flow f1 of the first swirl trajectory T1 of the first week swirls without flowing down on the shelf 18, and the swirl flow f3 of the second swirl trajectory T2 of the second week travels on the shelf 18. In the vicinity of the rim spout 26 where the water turns and in particular, water splash is likely to be suppressed, the occurrence of water splashing due to the collision of the wash water between the first turning trajectory T1 and the second turning trajectory T2 turning the rim portion 16 is suppressed. It can be done.
Further, since the rim spouting port 26 is formed on the upper end side of the rim portion 16 of the bowl portion 8, the rim spouting port 26 is surely provided to the user who viewed the bowl portion 8 from the front obliquely upper side. In order to enter the blind spot of the 16 overhang parts 16b, it becomes difficult for a user to visually recognize the rim spout 26. Furthermore, the cleanliness felt by the user can be improved, and the overall beauty of the bowl portion 8 can be improved.

  Furthermore, the rim spout 26 is formed in the rim part 16 located outside the inner edge part 18a of the shelf part 18 of the bowl part 8 (on the outer edge part 18b side of the shelf part 18). As will be described later with reference to FIG. 15, the first turning trajectory T1 is located outside the second turning trajectory T2 in plan view. Thereby, especially in the vicinity of the rim spout 26 where water splash is likely to occur, it is possible to effectively suppress the occurrence of water splashing due to the collision between the wash waters of the first turning track T1 and the second turning track T2. It has become.

  Further, the rim portion 16 of the bowl portion 8 is a rising portion of the inner peripheral surface 17 of the rim portion 16 extending toward the downstream side from the upper edge portion 26b forming the upper surface of the water passage 26a formed in the rim water discharge port 26. 16c, the continuous formation portion 26c is formed continuously from the front side of the toilet body 2 to the center line A1 (see FIG. 3). Located on the surface 17. Since the upper surface of the rim spout 26 and the overhang portion 16b of the rim 16 are continuously formed by such a continuous forming portion 26c, the wash water discharged from the rim spout 26 is not contained in the rim 16 It flows smoothly along the peripheral surface 17. Further, since the swirling flow f1 and the descending flow f2 passing through the vicinity of the front end portion 16a of the rim portion 16 having a small curvature radius are formed, the vicinity of the front end portion 16a of the rim portion 16 of the bowl portion 8 can be reliably washed. It is like that. Further, the upper edge portion 26b that forms the upper side surface of the water passage 26a that forms the rim water discharge port 26 and the inner peripheral surface 17 of the rim portion 16 are continuously formed, so that water is discharged from the rim water discharge port 26. The washing water can flow smoothly along the inner peripheral surface 17 of the rim portion 16 by centrifugal force, and it is possible to suppress the occurrence of water splashing due to collision between the swirling washing waters. It is like that.

  Further, the overhang portions 16b of the front side regions F1 and F2 of the rim portion 16 extend from the rim spout 26 toward the front side to the front end portion 16a in the front side region F1 of the rim portion 16, and from the front end portion 16a. It extends to the continuous forming portion 26c and is disposed symmetrically with respect to the front end portion 16a of the rim portion 16 when the inside of the bowl portion 8 is viewed from above. Thus, the rim spout 26 is formed in the vicinity of the front end portion 16a of the rim portion 16, and the overhang portion 16b of the rim portion 16 covers the rim spout 26. The rim water spouting port 26 cannot be visually recognized. Further, since the overhang portion 16b of the rim portion 16 is formed symmetrically in the vicinity of the front end portion 16a of the rim portion 16 of the bowl portion 8, the overall appearance of the bowl portion 8 can be improved. Yes.

Further, the rear edge 26 d of the rim water spouting port 26 is inclined upward from below toward the water discharging direction of the rim water spouting port 26. As a result, the wash water discharged from the rim spouting port 26 passes through the vicinity of the front end portion 16a of the rim portion 16 having a small curvature radius by the rim portion 26d of the rim spouting port 26 inclined upward from below. 16 forms a flow swirling backward (swirl flow f1), and also forms a flow descending from the upper end side of the rim portion 16 (downflow f2). The vicinity of the front end portion 16a of the rim portion 16 of the portion 8 can be reliably cleaned.
Further, even if an edge portion 26d of the rim water spouting port 26 is inclined upward from below in the water discharging direction, an unwashed portion is formed at the boundary between the first turning track T1 and the second turning track T2. The wash water discharged from the rim spout 26 can flow downward to prevent this unwashed portion from occurring.
Furthermore, a part of the cleaning water discharged from the rim water spouting port 26 can be lowered by the mouth edge portion 26d of the rim water spouting port 26 inclined upward from below toward the water discharging direction. Thus, the descending wash water can more effectively suppress the swirling flow f4 of the wash water discharged from the jet outlet 22 from jumping out of the recess 20. . Moreover, in the recessed part 20 of the bowl part 8, the rim water discharge which falls like this is added to the water discharge from the jet water discharge port 22, and the strong power which combined the horizontal direction swirl flow and the vertical direction swirl flow is combined. A swirling flow f4 having a rotational force is generated, and the waste discharging performance can be improved. Furthermore, water splashing that occurs when the rim water discharge and the jet water discharge collide can be more effectively suppressed.

  The rim portion 16 of the bowl portion 8 is formed symmetrically in the rear side region R and the front side region F3 region in the bowl portion 8 that can be visually recognized by the user from obliquely above the front of the bowl portion 8. The inner peripheral side is open, but the upper part is covered with the overhang part 16b, so that the user cannot see the rim part 16 from the diagonally upper front of the bowl part 8. The overall aesthetics of the part 8 can be improved.

In particular, as shown in FIGS. 9 to 11, the rim spout 26 is formed near the front end portion 16 a of the rim portion 16 of the bowl portion 8, and the inner peripheral surface 17 in the front region F <b> 1 of the rim portion 16 is In the vicinity of the front end portion 16a of the rim portion 16, an overhang is formed by a vertical surface 17a and a horizontal surface 17b extending inwardly from the vertical surface 17a. The vertical surface 17a and the horizontal surface 17b form a recessed space B projecting forward on the shelf 18 near the inner peripheral front end 16a of the rim portion 16, and the rim water spouting port is formed in the recessed space B. 26 and the vertical surface 17 of the rim portion 16 are continuously formed so as to be flush with each other.
That is, the rim water spouting port 26 rises in a substantially vertical direction of the rear region R and the front region F3 of the rim portion 16 of the bowl portion 8 in the front regions F1 and F2 of the rim portion 16 of the bowl portion 8. Is formed in a recessed space B formed so as to protrude forward and with a predetermined width in the left-right direction with respect to the virtual surface 16d which is flush with the inner peripheral surface 17 forming the. The upper edge portion of the recessed space B coincides with the overhang portion 16b, and the lower end of the front end portion 16a of the inner peripheral surface 16f in the recessed space B coincides with the front end 18c of the outer edge portion 18b of the shelf portion 18. .

  The rim water spouting port 26 is positioned in front of the rear edge 16e of the upper edge portion 16b of the recessed space B and rearward of the front end 18c of the outer edge portion 18b of the shelf portion 18. A water passage 26a extending from the rear end of the rim 26d of the water outlet 26 to the vicinity of the front end 16a along the inner peripheral surface 16f in the recessed space B is formed, and the inner peripheral surface in the recessed space B from the water passage 26a. The extended portion 26e extending through the foremost portion 16a of 16f is continuously formed from the inside of the recessed space B to the continuous forming portion 26c of the rim inner peripheral surface 16c on the rear side. Thereby, it becomes difficult for the user who looked at the bowl part 8 from the diagonally upward direction to visually recognize the rim water spouting port 26, and the clean feeling that the user feels can be improved.

  Furthermore, although details will be described later with reference to FIGS. 14 and 15, the swirling direction of the cleaning water discharged from the rim spout 26 and the swirling direction of the cleaning water discharged from the zet spout 22 in a plan view, They are in the same direction. Further, the water discharge direction D1 (arrow D1 in FIG. 14) at the jet discharge port 22 is obliquely downward toward the front, and is substantially the same as the water discharge direction D2 (arrow D2 in FIG. 14) at the rim water discharge port 26. It is like that.

Next, with reference to FIG. 6, FIG. 10, FIG. 12 and FIG. 13, the bonding process at the time of manufacturing the toilet bowl body 2 made of earthenware of the flush toilet 1 according to one embodiment of the present invention will be described.
FIG. 12 is a side view showing a toilet body in a state before an adhesion process in a flush toilet according to an embodiment of the present invention, and FIG. 13 is a toilet in a state before an adhesion process in a flush toilet according to an embodiment of the present invention. It is front sectional drawing which shows a main body.
As shown in FIGS. 12 and 13, the toilet bowl body 2 made of earthenware of the flush toilet 1 of the present embodiment includes a bowl portion 8 that forms a waste receiving surface 14 and a shelf portion 18 and excludes the rim portion 16. The lower toilet body 2a and the lower toilet body 2a having the rim 16 are formed separately in advance when the toilet body 2 is manufactured, and then the upper end of the lower toilet body 2a in the bonding process. An upper toilet body 2b to which a lower end 2d is bonded is provided over the entire circumference of 2c. The upper toilet body 2b includes a rim 16 that is bonded to the upper end of the bowl 2 body of the lower toilet body 2a in the bonding step.

  As shown in FIG. 13, the rim portion 16 of the upper toilet body 2b includes a rim inner wall portion 16g and a rim outer wall portion 16h that respectively form an inner periphery and an outer periphery of the rim portion 16, and these rim inner wall portions 16g. A rim bottom surface portion 16i that couples both lower ends of the rim outer wall portion 16h, and a rim upper surface portion 16j that couples both upper ends of the rim inner wall portion 16g and the rim outer wall portion 16h are provided. The rim inner wall portion 16g and the rim outer wall portion 16h A rim water conduit 10d is formed by the rim bottom surface portion 16i and the rim top surface portion 16j. Thereby, by using the space formed by the rim inner wall portion 16g, the rim outer wall portion 16h, the rim bottom surface portion 16i and the rim upper surface portion 16j of the rim portion 16 as the rim water conduit 10d, there is no need to provide a separate water conduit. The toilet body 2 can be made a simple structure. Further, since the rim water spouting port 26 is formed in the rim inner wall portion 16g at the front position of the bowl portion 8, a simpler structure is obtained.

  6 and 10 show the toilet body 2 in a state after the bonding process of the lower toilet body 2a and the upper toilet body 2b, the lower toilet body 2a except for the rim 16 is shown. An adhesive line C (boundary line) indicating an adhesive portion between the bowl portion 8 and the rim portion 16 of the upper toilet body portion 2b is located in a lower region of the rim bottom surface portion 16i in a plan view as viewed from above. Thereby, even when the bonding line C, which is the bonding portion between the rim portion 16 and the bowl portion 8 excluding the rim portion 16, appears on the outer surface of the toilet body 2, the boundary line C is viewed from above. Since it is sometimes located in the lower region of the rim bottom surface portion 16i, it cannot be seen by being hidden by the rim bottom surface portion of the rim portion, and the appearance of the entire outside of the toilet 1 can be improved. .

  Also, as shown in FIGS. 6 and 13, the bonding line C, which is the bonding portion between the body of the bowl portion 8 of the lower toilet body 2a and the rim portion 16 of the upper toilet body 2b, The upper end portion 8a of the rim 8 and the lower end portion 16k of the rim inner wall portion 16g are in line contact with each other to form a boundary line between the main body of the bowl portion 8 and the rim portion 16. Visible from the inside of the rim portion 16. Thus, when the rim portion 16 and the bowl portion 8 excluding the rim portion 16 are bonded at the time of manufacturing the toilet body 2, the lower end portion of the rim inner wall portion 16g and the upper end portion 8a of the bowl portion 8 excluding the rim portion 16 are Since the boundary line (adhesion line C) formed by the line contact is visible from the inside of the bowl part 8, the rim part 16 and the bowl part 8 excluding the rim part 16 in the manufacture of the toilet body 2 are Bonding work can be easily performed.

Next, the operation (operation) of the flush toilet according to one embodiment of the present invention will be described with reference to FIGS.
FIG. 14 shows a first turning trajectory for the first lap of rim water discharge and a second turning trajectory for the second lap when the rim cleaning is performed after the zet cleaning is started in the flush toilet according to the embodiment of the present invention. FIG. 15 is a perspective view schematically illustrating a state in which the swirling flow of the rim water discharge flows into the recess in the flush toilet according to the embodiment of the present invention. .

  First, when the user operates an operation lever (not shown) for toilet flushing, toilet flushing is started, and the flush water in the water storage tank 6 passes through the common conduit 10a and the Zet conduit 10b and the rim conduit. It branches to 10c and flows. And after the water discharge from the jet outlet 22 is started for the first time, the water discharge from the rim water outlet 26 is started late. At this time, the water discharge direction D1 (arrow D1 in FIG. 14) at the jet discharge port 22 is obliquely downward toward the front, and is substantially the same as the water discharge direction D2 (arrow D2 in FIG. 14) at the rim water discharge port 26. It has become.

  Further, as shown in FIGS. 11 and 14, the rim water discharged from the rim water discharge port 26 flows to the front side along the inner peripheral surface of the rim portion 16, and the rim portion where the radius of curvature is minimized. 16, a flow that swirls counterclockwise toward the rear side of the rim portion 16 (a swirling flow f <b> 1) passing through the vicinity of the front end portion 16 a of the rim portion 16 and a flow in which a part of the rim water discharge descends from the upper end side of the rim portion 16 (Downflow f2) is formed. The rim water spouting after turning the first round forms a counterclockwise swirling flow f3 of the second round inside the swirling flow f1 of the first round.

  On the other hand, the jet water discharged diagonally downward (water discharge direction D1) from the jet water discharge port 22 flows along the front wall surface 20b and the bottom surface 20a in the recess 20 and from the lower side toward the rear side. After swirling while rising obliquely upward, an oblique swirl flow f4 is formed that swirls forward and obliquely downward along the rear wall surface 20b in the recess 20. The oblique swirl flow f4 forms a counterclockwise swirl flow when the concave portion 20 is viewed in plan view from above, and the swirl direction of the rim water discharge and the swirl direction of the jet water discharge are the same direction (counterclockwise in the plan view). ).

  Further, as shown in FIG. 14, the first turning trajectory T1 when the cleaning water discharged from the rim spout 26 is swirling along the rim portion 16 with the swirling flow f1 on the first circumference is the first turning trajectory T1. After the first turn on the first turn trajectory T1, the second turn orbit T2 when turning along the rim portion 16 and the shelf 18 in the second turn turning flow f3 and above. Located on the outside.

  Next, as shown in FIG. 14, the rim water spouting flows down into the recess 20 along the filth receiving surface 14 while generally maintaining the momentum in the direction of the counterclockwise swirling flow, and swirling the jet water discharging in the recess 20. An oblique swirling flow f4 having a relatively strong and fast rotational force is generated in the recess 20 by joining the flow.

Further, as shown in FIG. 15, new rim water spouting is continuously performed from the rim water spouting port 26 after the rim water spouting has joined the oblique swirling flow f4 of the jet water discharging in the recess 20, and the surface of the dirt receiving surface 14 is When the amount of swirling rim water discharge increases, the swirling flow f5 of the rim water discharge having increased water flow flows down and merges toward the slant swirling flow f4 of the jet water discharge in the recess 20, and the filth in the recess 20 is trapped in the drainage. A flow that strongly pushes toward the inlet 12a of the pipe 12 is formed.
Eventually, the filth having a large specific gravity can be pushed into the drain trap pipe 12 from the bowl portion 8 by the relatively strong rotational force of the oblique swirl flow f4 in the recess 20 after the rim water discharge merging. The floating filth having a small size can be sent out from the bowl portion 8 into the drain trap pipe 12 by the relatively swirling oblique swirl flow f4 after the merge.

Next, (a) of FIG. 16 shows an example of the result of analyzing the flow velocity distribution regarding the rim water discharge and the jet water discharge when toilet flushing is performed using the flush toilet according to one embodiment of the present invention. (B) of FIG. 16 shows, as a comparative example of the analysis result shown in FIG. 16 (a), the result of analyzing the flow velocity distribution regarding rim water discharge and jet water discharge when toilet flushing is performed using a conventional flush toilet. .
First, the color of the wash water shown in FIG. 16 (a) indicates the magnitude of the flow rate of the wash water, but the toilet body 2 of the flush toilet 1 of the present embodiment described above is viewed from above. Sometimes, a relatively large flow rate of cleaning water is obtained from the rim spout in the bowl part to the rear side region swiveled counterclockwise through the front end of the rim part, and in the vicinity of the jet outlet and the front side region of the recess. ing.

  On the other hand, the flush toilet of the comparative example shown in FIG. 16B differs from the flush toilet 1 of the present embodiment in that two rim spouts (first And a second rim spout) and a zette spout on the side wall surface on one side of the recess in the bowl portion, but the region from the front end of the rim portion in the bowl portion to the vicinity of the rear second rim spout In this embodiment, the flow rate of the washing water is relatively small as compared with the flush toilet 1 of the present embodiment, and the cleaning power of the flush toilet of the present embodiment is improved as compared with the conventional flush toilet. I understand that.

Next, (a) of FIG. 17 shows an example of the result of analyzing the flow velocity distribution and the state of the flow regarding the jet water discharge when toilet flushing is performed using the flush toilet according to one embodiment of the present invention. 17 (b) is a result of analyzing the flow velocity distribution and the state of the flow relating to the jet water discharge when toilet flushing is performed using a conventional flush toilet as a comparative example of the analysis results shown in FIG. 17 (a). Indicates.
First, although the color of the streamline of the wash water shown in FIG. 17A indicates the magnitude of the flow rate of the wash water, the toilet body 2 of the flush toilet 1 of the present embodiment described above is located on the side. When viewed from the side, the jet water discharged diagonally downward from the jet water outlet of the concave portion of the bowl portion flows along the front side wall surface and the bottom surface in the concave portion, and from the lower side toward the rear side. It can be seen that an oblique swirl flow f4 is formed that swirls forward and obliquely downward along the rear wall surface in the recess after swirling while rising obliquely upward.

  On the other hand, the flush toilet of the comparative example shown in (b) of FIG. 17 has the same form as the flush toilet of the comparative example shown in (b) of FIG. 16, and the jet water discharged from the jet outlet However, after water is discharged toward the side wall surface of the recess facing the jet outlet, a flow descending to the bottom surface of the recess is formed. Therefore, the flow velocity and rotational force of the swirling flow in the recess of the flush toilet according to the comparative example are the same as the flow velocity and rotational force of the strong oblique swirling flow f4 of the flush toilet 1 of the present embodiment shown in FIG. Compared with the conventional flush toilet, the drainage performance of the sewage toilet of this embodiment is improved more because the flow is weaker than that and the flow into the drain trap pipe is small.

  According to the flush toilet 1 according to the embodiment of the present invention described above, the rim spout 26 is formed on either one of the left and right sides in the front region F of the rim portion 16, and the washing water is directed forward. The discharged water is discharged from the front region F2 of the rim portion 16 through the front end portion 16a in the front region F1, and then turns to the rear region R through the front regions F2 and F3. Therefore, since the washing water having the water force discharged from the rim water spouting port 26 first passes through the inner peripheral front end portion 16a of the rim portion 16 having a small curvature radius, the water is washed in the front region F1 of the rim portion 16. It is possible to prevent water from swirling and causing poor cleaning. Furthermore, since it can turn in the state which maintained the comparatively strong water force to the back side area | region R of the rim | limb part 16, the back side area | region R of the bowl part 8 which is easy to get dirty can also be wash | cleaned reliably.

  Further, according to the flush toilet 1 according to the present embodiment, the rim spout 26 is located on the rear side of the front side region F1 including the inner peripheral front end portion 16a of the rim portion 16 formed with the minimum curvature radius ρ1. Since it is formed in the front side region F2, the water discharge direction vector and the water flow of the wash water discharged from the rim water discharge port 26 can be stabilized, and the inside of the rim portion 16 can be maintained while maintaining a relatively strong water flow. After passing through the circumferential front end portion 16a, the vehicle can turn to the rear region R of the rim portion 16. As a result, the rear side region R of the bowl portion 8 which is easily contaminated can be washed firmly, and the washing water after passing through the rear side region R continues to swivel while maintaining the momentum. Therefore, the front end portion 16a of the rim portion 16 is maintained. It is possible to prevent the vicinity from turning and causing poor cleaning. Moreover, since it can turn in the state which maintained the comparatively strong water force to the back side area | region R of the rim | limb part 16, the back side area | region R of the bowl part 8 which is easy to get dirty can also be wash | cleaned reliably.

  Furthermore, according to the flush toilet 1 according to the present embodiment, the rim spout 26 is either on the left or right of the front end portion 26 on the inner peripheral side of the rim portion 16 in the front region F2 of the rim portion 16 of the bowl portion 8. Since it is formed in a part adjacent to one side and the radius of curvature ρ2 is changed from a large radius of curvature to a small radius of curvature, the wash water discharged from the rim outlet 26 maintains a strong water state. Since it is possible to immediately reach the inner peripheral front end 16a of the rim portion 16 and then turn to the rear region R of the rim portion 16, the inner peripheral front end 16a of the rim portion 16 having the minimum curvature radius ρ1. In this case, it is possible to prevent the cleaning water from turning and causing poor cleaning. Moreover, since it can turn in the state which maintained comparatively strong water power enough to the back side area | region R of the rim | limb 16, the rear side area | region R of the bowl part 8 which is easy to become dirty can also be wash | cleaned more reliably.

  Further, according to the flush toilet 1 according to the present embodiment, most of the rear region R of the rim portion 16 of the bowl portion 8 forms a part of a perfect circle having a predetermined radius (curvature radius ρ3). In addition, since the radius of curvature ρ3 (radius) does not change in most of the rear region R of the rim portion 16 of the bowl portion 8, the energy loss of the washing water when passing through the rear region R of the rim portion 16 is suppressed. The washing water can be swirled more reliably. Moreover, since it can turn in the state which maintained the comparatively strong water force to the back side area | region R of the rim | limb part 16, the back side area | region R of the bowl part 8 which is easy to become dirty can also be wash | cleaned reliably.

  Furthermore, according to the flush toilet 1 according to the present embodiment, the inner peripheral surface 17 of the rim portion 16 of the bowl portion 8 has a shape that overhangs inward in the vicinity of the inner peripheral front end portion 16a of the rim portion 16. Since the rim portion 16 is formed in a shape that rises substantially vertically except in the vicinity of the inner peripheral front end portion 16a of the rim portion 16, the toilet 1 in the vicinity of the inner peripheral front end portion 16a of the rim portion 16 having the minimum curvature radius ρ1. Therefore, the water flow of the wash water discharged from the rim spout 26 can be increased. Therefore, it is possible to prevent the cleaning water from turning around in the vicinity of the inner peripheral front end portion 16a of the rim portion 16 having a small curvature radius and causing poor cleaning. Moreover, since it can turn in the state which maintained the comparatively strong water force enough to the back side area | region R of the rim | limb part 16, the back side area | region R of the bowl part 8 which is easy to become dirty can also be wash | cleaned more reliably. Furthermore, since the inner peripheral surface 17 of the rim portion 16 of the bowl portion 8 is formed in a shape that rises substantially vertically except in the vicinity of the front end, even if dirt is attached, it is easy to wipe and improve the cleaning performance. be able to.

  Further, according to the flush toilet 1 according to the present embodiment, the rim spout 26 is formed on the upper end side of the rim portion 16 of the bowl portion 8, so the rim spout 26 located at a relatively high position of the rim portion 16. The wash water discharged from the rim portion forms a flow (swirl flow f1) that passes through the vicinity of the inner peripheral front end portion 16a of the rim portion 16 having a small curvature radius and swirls toward the rear side of the rim portion 16, and the rim portion. 16 to form a flow descending from the upper end side (downflow f2), the swirling flow f1 and the downward flow f2 cause the dirt on the inner peripheral side front end 16a of the rim portion 16 of the bowl portion 8 to easily remain. A wide area of the formed overhang-shaped inner peripheral surface 17 can be reliably cleaned.

  Further, according to the flush toilet 1 according to the present embodiment, the upper surface 26b of the rim spout 26 and the overhanging portion 16b of the inner peripheral surface 17 of the rim portion 16 are formed continuously. The cleaning water discharged from the rim spout 26 located at a higher position on the upper end side flows smoothly along the inner peripheral surface 17 of the rim portion 16, and the inner peripheral front end portion of the rim portion 16 having a small curvature radius. Since the swirling flow F1 and the downward flow F2 passing through the vicinity of 16a are formed, a wide area of the overhanging inner peripheral surface 17 formed in the vicinity of the inner peripheral side front end portion 16a of the rim portion 16 of the bowl portion 8 is formed. It can be washed reliably.

  Furthermore, according to the flush toilet 1 according to the present embodiment, since the rim portion 26d of the rim spout 26 is inclined upward from below toward the water discharge direction, the wash water discharged from the rim spout 26 is The rim portion 26d inclined upward from below forms a flow (swirl flow f1) that passes through the vicinity of the inner peripheral front end 16a of the rim portion 16 having a small curvature radius and swirls toward the rear side of the rim portion 16. In addition, a flow descending from the upper end side of the rim portion (downflow f2) is formed, and the swirl flow f1 and the downward flow f2 ensure that the vicinity of the inner peripheral side front end portion 16a of the rim portion 16 of the bowl portion 8 is ensured. Can be washed.

  In the flush toilet 1 according to the present embodiment described above, the wash-out flush toilet has been described as an example. However, the sewage inside the bowl portion is sucked into the bowl portion using a siphon action, and the drain trap pipe is connected to the outside at once. A so-called siphon flush toilet may be used.

  Moreover, in the flush toilet 1 by this embodiment mentioned above, while performing the jet water discharge by the jet water channel 10b and the water jet port 22, the rim water discharge by the rim water channel 10d and the rim water nozzle 26 is demonstrated. However, the present invention is not limited to such a form, and the present invention can be applied to a form in which the zet water discharge by the zet water channel 10b and the zet water discharge port 22 is omitted and only the rim water discharge by the rim water channel 10d and the rim water discharge port 26 is performed. It is.

DESCRIPTION OF SYMBOLS 1 Flush toilet 2 Toilet body 2a Lower toilet body 2b Upper toilet body 2c Upper end of lower toilet body 2d Lower end of upper toilet body 4 Toilet lid 6 Water storage tank (wash water supply means)
6a Drain port of water storage tank 8 Bowl part 8a Upper end part of main body of bowl part 10 Water conduit 10a Common water conduit 10b Zet water conduit 10c Inlet portion of water conduit 10d Rim water conduit 12 Drain trap conduit (drainage channel)
12a Drain trap pipe inlet 12b Drain trap pipe ascending path 12c Drain trap pipe descending path 14 Soil receiving surface 14a Lower edge of sewage receiving surface 16 Rim portion 16a Rim portion front end 16b Rim portion overhang Part 16c Rising part of the rim part 16d Virtual surface that is flush with the inner peripheral surface of the rising part of the rim part 16e Rear edge of the overhang part of the rim part 16f Inner peripheral surface in the recessed space of the rim part 16g Inner wall part of the rim part 16h Rim portion outer wall portion 16i Rim portion bottom surface portion 16j Rim portion upper surface portion 16k Lower end portion of rim portion inner wall portion 17 Inner circumferential surface of rim portion 17a Vertical surface 17b Horizontal surface 18 Shelf portion 18a Inner edge portion of shelf portion 18b Outer edge portion of shelf portion 18c Front end of outer edge portion of shelf portion 20 recess 20a bottom surface of recess 20b wall surface of recess 22 jet water outlet (jet water discharge portion)
24 Drainage socket 26 Rim spout (rim spout)
26a Water passage in the rim water outlet 26b Upper edge portion of the water passage in the rim water outlet 26c Continuous formation portion 26d Edge portion of the rim water outlet 26e Extension portion of the water passage in the rim water outlet A1 Center line in the front-rear direction A2 Bowl B center space B Adhesive line D1 Water discharge direction D2 Water discharge direction R2 Water discharge direction F Front area of the bowl section F1 Front area of the bowl section F2 Front area of the bowl section F3 Front of the bowl section Side area f1 Swirling flow in the first lap (mainstream)
f2 Downstream flow f3 Second-round swirl flow f4 Oblique swirl flow f5 Swirl flow R Rear side region of bowl portion T1 First swirl track T2 Second swirl track

Claims (8)

A flush toilet that flushes toilets with wash water supplied from a wash water source and discharges filth,
A bowl portion comprising a bowl-shaped waste receiving surface, a rim portion formed at the upper edge, and a shelf formed between the rim portion and the waste receiving surface;
A drainage channel where the inlet is connected to the bottom of the bowl portion and discharges filth,
A water discharger for forming a swirling flow by discharging the wash water onto the shelf of the bowl part;
A water conduit that supplies cleaning water to the water discharge part,
The bowl portion includes a front region and a rear region,
The rim portion of the bowl portion has a curvature radius of the front region equal to or smaller than a curvature radius of the rear region,
The water discharge portion is formed on either one of the left and right sides in the front region of the rim portion, and discharges the wash water toward the front, and the discharged wash water is front end from the front region of the rim portion. A flush toilet characterized by turning to the rear side area after passing through.   In the bowl portion, the front end of the rim portion is formed with a minimum radius of curvature in the entire circumference of the rim portion, and the water discharge portion is formed behind the front end of the rim portion in the front region. The flush toilet according to claim 1.   The water discharge portion is formed in a portion of the front portion of the rim portion of the bowl portion adjacent to one of the left and right sides of the front end of the rim portion and changing from a large curvature radius to a small curvature radius. The flush toilet according to claim 2.   The flush toilet according to any one of claims 1 to 3, wherein the bowl portion forms a part of a perfect circle having a predetermined radius in a most part of a rear side region of the rim portion.   The rim portion of the bowl portion has an inner peripheral surface formed in a shape that overhangs inward near the front end of the rim portion, and is formed in a shape that rises substantially vertically except near the front end of the rim portion. The flush toilet according to claim 2 or 3.   The flush toilet according to claim 5, wherein the water discharge portion is formed on an upper end side of the rim portion of the bowl portion.   The flush toilet according to claim 6, wherein the water discharge portion includes a water discharge port, and an overhang-shaped portion of the upper surface of the water discharge port and the inner peripheral surface of the rim portion is continuously formed.   The flush toilet according to claim 6 or 7, wherein an edge of the water discharge portion is inclined upward from below toward the water discharge direction.