JP2021071008A - Flush toilet - Google Patents

Abstract

To provide a flush toilet capable of improving excrement discharge capacity with high cleanability of an excrement receiving surface.SOLUTION: A flush toilet 12 includes: a toilet bowl part 18 that has an excrement receiving surface 60 and a water reserve part 62 which is recess downward from a lower edge of the excrement receiving surface 60; a first water discharge part 28A for forming a water flow that flows into water reserve part 62 from behind using washing water discharged from a first water discharge port 30A that opens at one side in a left-right direction of the toilet bowl part 18; and a second water discharge part 28B that discharges washing water with a flow rate faster than that of the first water discharge port 30A from a second water discharge port 30B that opens at the other side in the left-right direction of the toilet bowl part 18.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to flush toilets.

Conventionally, various studies have been made on a cleaning method for discharging filth. In Patent Document 1, a swirling flow is formed in the left and right side regions of the toilet bowl portion toward the rear, and a part of the swirling flow is allowed to flow into the pool portion of the toilet bowl portion from the rear to enter the drainage channel. A flush toilet that can form a guided flow for pushing filth into the toilet is disclosed.

Japanese Unexamined Patent Publication No. 2016-89431

In flush toilets, it is desirable to improve the cleanability of the sewage receiving surface and the sewage discharge capacity so that the user can use it comfortably.

One of the objects of the present disclosure is to provide a flush toilet with a high cleaning property of a sewage receiving surface and a high sewage discharge capacity.

One aspect of the present disclosure for solving the above-mentioned problems is a flush toilet. A flush toilet of a certain aspect has a toilet bowl portion having a filth receiving surface and a water collecting portion recessed downward from the lower end edge of the filth receiving surface, and a first opening on one side of the toilet bowl portion in the left-right direction. Faster than the first spout from the first spout that forms a water flow that flows into the reservoir from behind by the wash water that is spouted from the spout and the second spout that opens on the other side of the toilet bowl in the left-right direction. It is provided with a second water discharge unit that discharges wash water having a flow velocity.

It is a side view which shows the flush toilet of an embodiment. It is a side sectional view which shows the flush toilet of an embodiment. It is a block diagram of the toilet bowl device of an embodiment. It is a figure which shows the flow of the washing water. It is another figure which shows the flow of the washing water. FIG. 3 is a cross-sectional view taken along the line BB of FIG. It is a perspective sectional view which shows the flush toilet of an embodiment. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 8 is a cross-sectional view taken along the line DD of FIG. It is a graph which shows the radius of curvature of the connecting surface of an embodiment. FIG. 3 is a cross-sectional view taken along the line CC of FIG. It is a vertical cross-sectional view which shows the 1st water passage of a comparative example. FIG. 3 is an enlarged view showing the first water channel of FIG. 3 and its surroundings. It is a top sectional view which shows the flush toilet of an embodiment. FIG. 14 is a cross-sectional view taken along the line EE of FIG. FIG. 14 is a cross-sectional view taken along the line FF of FIG. It is a top sectional view which shows the flush toilet of a modification.

Hereinafter, embodiments will be described. The same components are designated by the same reference numerals, and duplicate description will be omitted. In each drawing, the components are omitted, enlarged, or reduced as appropriate for convenience of explanation. The drawings shall be viewed according to the orientation of the symbols. The shapes referred to in the present specification include not only shapes that exactly match the shapes referred to, but also shapes that are deviated by an error such as a dimensional error or a manufacturing error. Unless otherwise specified, the term "connection" as used herein includes not only the case where the two parties directly satisfy the conditions mentioned, but also the case where the conditions are satisfied through other members.

Hereinafter, the positional relationship of each component will be described using three directions orthogonal to each other. This direction is the front-rear direction X, the left-right direction Y, and the up-down direction Z. When the toilet device 10 is installed in the toilet room, ideally, the front-rear direction X and the left-right direction Y are horizontal directions, and the vertical direction Z is a vertical direction. In this state, the front-rear direction X and the left-right direction Y correspond to the front-back left-right of the user sitting in the normal posture on the toilet seat (not shown) attached to the flush toilet 12.

See FIGS. 1 to 3. FIG. 3 shows a cross section taken along the line AA of FIG. 2 together with a configuration diagram of the toilet bowl device 10. The toilet device 10 mainly includes a flush toilet 12 (hereinafter, simply referred to as a toilet 12) and a water supply device 14 that supplies washing water to the toilet 12. The water supply device 14 is configured by using, for example, a flush valve, a tank, or the like. The water supply device 14 supplies wash water to the toilet bowl 12 through a water supply pipe 16 connected to the toilet bowl 12.

The toilet bowl 12 of the present embodiment is a Western-style toilet bowl. The toilet bowl 12 of the present embodiment is a wall-mounted type that is arranged at a distance from the floor of the toilet room. The toilet bowl 12 is fixed in a state of being hung on a support member (not shown) such as a frame arranged on the back side of the wall body W of the toilet room. The wall body W is provided so as to stand up from the floor of the toilet room. The material of the toilet bowl 12 of this embodiment is pottery. The material of the toilet bowl 12 is not particularly limited, and may be, for example, resin or the like.

The toilet bowl 12 includes a bowl-shaped toilet bowl portion 18 for receiving filth, an upper surface portion 20 through which the upper end opening of the toilet bowl portion 18 opens, and a drainage pipe 26 connected to the bottom of the toilet bowl portion 18. A pair of outer wall portions 22 facing outward in the left-right direction Y, a first spouting portion 28A and a second spouting portion 28B for discharging the washing water to the toilet bowl portion 18, and a washing water supplied from the water supply device 14 are the first. A common water channel 38 that supplies water to the water discharge unit 28A and the second water discharge unit 28B is provided. The upper surface portion 20 is provided so as to extend from the upper end opening of the toilet bowl portion 18 to the front, back, left and right.

The outer side wall portion 22 forms an externally exposed surface that is exposed to the outside. The outer side wall portion 22 is continuous with the outer peripheral edge portion 20a of the upper surface portion 20 in the range from the front end portion to the rear end portion of the upper surface portion 20, and is provided so as to extend downward from the outer peripheral edge portion 20a. The outer wall portion 22 of the present embodiment includes a recess 24 recessed in the left-right direction.

The drainage pipe 26 is connected to a drainage pipe (not shown) installed in the building. The drainage pipe 26 serves as a passage for filth and the like discharged from the toilet bowl portion 18 to the sewage side waterway.

The first water discharge unit 28A includes a first water discharge port 30A for discharging the wash water, and a first water passage 34A for supplying the wash water to the first water discharge port 30A. The second water spouting unit 28B includes a second water spouting port 30B for discharging the washing water, and a second water passage 34B for supplying the washing water to the second water spouting port 30B.

Washing water is supplied from the water supply device 14 to the common water channel 38 through the water supply pipe 16. The first channel 34A and the second channel 34B branch off from the downstream end of the common channel 38. The branch point 40 of the first water passage 34A and the second water passage 34B is provided behind the toilet bowl portion 18. In the present embodiment, the branch portion 40 is provided at the central portion of the toilet bowl 12 in the left-right direction Y. The first channel 34A branches to the left from the common channel 38. The second channel 34B branches to the right from the common channel 38.

The first water passage 34A is provided so as to pass through the left rear side of the toilet bowl portion 18. The first water passage 34A is continuous with the first water discharge port 30A, and supplies the washing water supplied from the common water channel 38 to the first water discharge port 30A.

The first spout 30A of the present embodiment is formed on the upper part of the left rear side portion 18a which is the portion of the toilet bowl portion 18 on the left side of the left and right center line La and on the rear side of the front and rear center line Lb. The first spout 30A of the present embodiment is formed behind the water reservoir 62. The left-right center line La is a straight line that bisects the dimension of the inner surface portion of the toilet bowl portion 18 along the left-right direction Y and extends along the front-rear direction X in a plan view. The front-rear center line Lb is a straight line that bisects the dimension of the inner surface portion of the toilet bowl portion 18 along the front-rear direction X and extends along the left-right direction Y in a plan view. The first water spout 30A is open diagonally to the right and rearward, and discharges the washing water toward one side in the circumferential direction, that is, counterclockwise in a plan view.

The second water passage 34B is provided so as to pass through the right rear side of the toilet bowl portion 18. The second water passage 34B is continuous with the second water discharge port 30B, and supplies the washing water supplied from the common water passage 38 to the second water discharge port 30B.

The second spout 30B of the present embodiment is formed on the right side portion 18b, which is the portion of the toilet bowl portion 18 on the right side of the left and right center line La. The second spout 30B of the present embodiment is formed at a position overlapping the water reservoir 62 in the left-right direction Y in a plan view. The second spout 30B is open toward the front, and like the first spout 30A, the second spout 30B discharges the washing water toward one side in the circumferential direction, that is, counterclockwise in a plan view.

The toilet bowl portion 18 includes a pot-shaped filth receiving surface 60 for receiving filth, and a water collecting portion 62 that is recessed downward from the lower end edge of the filth receiving surface 60.

The water reservoir 62 includes a bottom wall surface 62a, a left standing wall surface 62b rising from the left side of the bottom wall surface 62a, a right standing wall surface 62c rising from the right side of the bottom wall surface 62a, and a rear standing wall surface 62d rising from the back side of the bottom wall surface 62a. , And is formed in a concave shape. The line Lc connecting the deepest portions of the water reservoir 62 at each front-rear direction position is slightly deviated from the left-right center line La. The entrance 26a of the drainage pipe 26 opens at the rear of the bottom wall surface 62a. Washing water is stored in the water reservoir 62.

The left standing wall surface 62b and the right standing wall surface 62c are provided so as to be closer to each other toward the front side. Therefore, the water reservoir 62 has a shape that tapers toward the front side in a plan view. This configuration contributes to the formation of the induced flow Fwg (see FIG. 5), which will be described later. The front end portions of the left standing wall surface 62b and the right standing wall surface 62c are smoothly connected to each other via the first concave curved surface 62e. The rear end of the left standing wall surface 62b is smoothly connected to the back standing wall surface 62d via the second concave curved surface 62f. The rear end of the right standing wall surface 62c is smoothly connected to the water reservoir 62 via the third concave curved surface 62g. The term "smoothly" as used herein means that the surface referred to is smooth without any irregularities or steps.

A part of the range from the outer peripheral end portion 60b of the filth receiving surface 60 toward the inside (center side of the toilet bowl portion 18) constitutes the shelf surface 66. The shelf surface 66 is slightly inclined so as to be in a lower position toward the inside. The shelf surface 66 of the present implementation is provided on the peripheral edge of the filth receiving surface 60 except for a part of the front surface. The shelf surface 66 is continuous with the inner and lower surfaces of the first spout 30A and the inner and lower surfaces of the second spout 30B. The shelf surface 66 describes the operation of the first spout 30 toilet device 10. When the predetermined cleaning start condition is satisfied, the water supply device 14 supplies a predetermined amount of cleaning water to the inside of the toilet bowl 12 through the water supply pipe 16. Guide the washing water discharged from A and the second spout 30B to swirl.

The above is the basic configuration of the toilet bowl device 10. Subsequently, the operation of the toilet bowl device 10 will be described. When the predetermined cleaning start condition is satisfied, the water supply device 14 supplies a predetermined amount of cleaning water to the inside of the toilet bowl 12 through the water supply pipe 16. The cleaning start condition is, for example, receiving a cleaning start command by an external operating device such as a remote controller. The flush water supplied to the flush toilet 12 is discharged from the spouts 30A and 30B to the toilet bowl portion 18 via the common water channel 38 and the water passages 34A and 34B. The toilet bowl portion 18 is washed with the washing water, and the filth in the toilet bowl portion 18 is discharged through the drainage pipe line 26.

Next, how the washing water supplied to the toilet bowl portion 18 flows will be described. See FIG. In FIG. 4, the rear side region 70, the left side region 72, the right side region 74, and the front side region 76 show four regions of the filth receiving surface 60 separated by the alternate long and short dash line. The rear area 70 is an area of the filth receiving surface 60 on the rear side of the water reservoir 62. The left side region 72 is a region of the filth receiving surface 60 on the left side of the water reservoir 62 and the rear side region 70. The right side region 74 is a region of the filth receiving surface 60 on the right side of the water reservoir 62 and the rear side region 70. It is a region of the filth receiving surface 60 on the front side of the water reservoir 62, the left side region 72 and the right side region 74.

The first water discharge unit 28A forms a first water flow Fwa and a second water flow Fwb by the washing water discharged from the first water discharge port 30A. The first water flow Fwa is a water flow that mainly goes down the back wall surface 62d and flows into the water reservoir 62 from the rear. “Inflowing from the rear” means that the washing water (water flow) having a positive velocity component flows into the washing water collected in the water reservoir 62. The second water flow Fwb is a water flow that turns counterclockwise around the shelf surface 66 behind the first water flow Fwa and proceeds to the right region 74. The second stream Fwb cleans the right region 74.

The second water discharge unit 28B forms a third water flow Fwc and a fourth water flow Fwd by the washing water discharged from the second water discharge port 30B. The third water flow Fwc is a water flow that mainly cleans the right side of the front region 76 and flows into the water reservoir 62 from the front. The fourth water flow Fwd travels forward in the right side region 74, passes through the front end portion of the front side region 76 and thus the filth receiving surface 60, travels backward in the left side region 72, and merges with the washing water discharged from the first spout 30A. It is a stream of water.

A part of the fourth water flow Fwd forms a fifth water flow Fwe that is bounced off by the first water flow Fwa and flows into the water reservoir 62 from the rear. The rest of the fourth stream Fwd forms a sixth stream Fwe that merges with the second stream Fwb.

See FIG. The first water flow Fwa is an induced flow that changes its direction upward and backward by colliding with the bottom wall surface 62a and the left standing wall surface 62b of the water storage portion 62, then rises in the water storage portion 62 and then descends due to its own weight. (Vertical swirling flow) Fwg is formed. The induced flow Fwg rises rearward in the water reservoir 62 and then descends, so that the flow is such that filth is pushed into the inlet 26a of the drainage pipe 26. As described above, the water reservoir 62 is configured to form a guided flow Fwg that pushes filth into the drainage pipe 26 by the flow flowing from the rear through the rear wall surface 62d or the right standing wall surface 62c.

Subsequently, the following 11 characteristic configurations (1) to (11) of the toilet bowl device 10 will be described.

(1) Refer to FIGS. 4 to 6. FIG. 6 is a front view of the first spout 30A. The first spout 30A is formed vertically. "Vertical" means that the dimension D1 in the vertical direction (that is, the vertical direction Z) is larger than the dimension D2 in the horizontal direction (that is, the width direction that is the horizontal direction).

In order to ensure the cleanability of the right side region 74, it is necessary to bring an appropriate amount of the second water flow at an appropriate speed to the right side region 74, and for that purpose, the cleaning water is washed from the first spout 30A at a predetermined flow velocity or higher. Need to be spit out. In this case, if the first water spout 30A is not vertically long and therefore the first water flow Fwa is formed in a relatively thin film shape, the first water flow Fwa is formed on the inner surface (that is, the filth receiving surface 60 or the back stand) of the toilet bowl portion 18. It flows along the wall surface 62d and the right standing wall surface 62c). In other words, it flows while being supported by the inner surface of the toilet bowl portion 18. In this case, since the first water flow Fwa falls over a relatively long time, most of the first water flow Fwa wraps around to the right vertical wall surface 62c and then flows into the washing water collected in the water reservoir 62. That is, the first water flow Fwa flows relatively forward of the water reservoir 62.

As a result of examining the induced flow Fwg, the present discloser has obtained the finding that if the water flow flows into the rear of the water reservoir 62, the water force of the induced flow Fwg is amplified and the filth discharge capacity can be improved. .. On the other hand, in the present embodiment, the first spout 30A is formed vertically, and therefore, the first spout 30A has a bundle shape having a vertically long cross-sectional shape perpendicular to the spouting direction, such as being spit out from a hose. Washing water is spit out. The first water flow Fwa becomes a vertically long bundle-shaped water flow at least immediately after being discharged from the first spout 30A. The portion of the first water flow Fwa in contact with the inner surface of the toilet bowl portion 18 (that is, the lower portion of the first water flow Fwa) flows along the inner surface of the toilet bowl portion 18 while being supported by the inner surface of the toilet bowl portion 18. The portion of the first water flow Fwa that is not in contact with the inner surface of the toilet bowl portion 18 (that is, the upper portion of the first water flow Fwa) falls without being supported by the inner surface of the toilet bowl portion 18. Since the upper portion of the first water flow Fwa falls in a relatively short time, it flows into the washing water collected in the water reservoir 62 from the back wall 62d without wrapping around to the right standing wall 62c. That is, the first water flow Fwa flows into the reservoir portion 62 relatively rearward, and as a result, the water force of the induced flow Fwg is amplified, and the filth discharge capacity is improved.

In addition to this, the film-like fourth water stream Fwd joins the vertically long, that is, the thick first water stream Fwa. In this case, the fourth water flow Fwd is likely to be repelled by the first water flow Fwa. Therefore, more of the fourth water flow Fwd becomes the fifth water flow Fwe and flows into the water reservoir 62 from the rear. As a result, the water force of the induced flow Fwg is amplified, and the filth discharge capacity is improved.

(2) Refer to FIGS. 3 to 4. If the first spout 30A opens laterally, that is, to the right, and the washing water is discharged from the first spout 30A to the right, most of the washing water inevitably passes through the back wall 62d. Then, it flows into the washing water collected in the water collecting portion 62 along the back standing wall surface 62d, or wraps around from the back standing wall surface 62d to the right standing wall surface 62c and is collected in the water collecting part 62 along the right standing wall surface 62c. It flows into the washing water. In this case, the amount of washing water reaching the right side region 74 of the filth receiving surface 60 becomes insufficient, and the cleanability of the right side region 74 deteriorates.

On the other hand, in the toilet bowl 12 of the present embodiment, the first water spouting port 30A is opened diagonally to the right rearward, and is directed diagonally rearward to the right from the first water spouting port 30A, specifically behind the water reservoir 62. Washing water is discharged toward the area of the shelf surface 66 where it is located. In other words, the first water spouting portion 28A of the present embodiment discharges the washing water diagonally to the right rearward from the first spouting port 30A, thereby circulating the area of the shelf surface 66 located behind the water collecting portion 62 in the circumferential direction. It is configured to form a second stream Fwb that travels toward one side (ie, counterclockwise). In this case, an appropriate amount of the cleaning water discharged from the first spout 30A can reach the right side region 74, and the cleaning performance of the right side region 74 can be improved.

(3) Refer to FIGS. 3 to 4. The toilet bowl 12 is formed so that the height position of the inner and lower surfaces of the second spout 30B (position in the vertical direction Z) is lower than the height position of the inner and lower surfaces of the first spout 30A. The "height position of the inner and lower surfaces of the spout" refers to the height position of the lowest portion of the inner and lower surfaces. In this case, the fourth water flow Fwd that joins the first water flow Fwa finally climbs from the height position of the inner and lower surfaces of the second spout 30B to a height position higher than that. As a result, the velocity component of the fourth water flow Fwd toward the rear is decelerated, and it becomes easy to be repelled by the first water flow Fwa. Therefore, more of the washing water of the fourth water flow Fwd becomes the fifth water flow Fwe and flows into the water reservoir 62 from the rear. As a result, the water force of the induced flow Fwg is amplified, and the filth discharge capacity is improved.

(4) Refer to FIGS. 3 to 4. The portion of the shelf surface 66 located behind the water reservoir 62 is formed so that the central portion C in the left-right direction is higher than the inner and lower surfaces of the first water discharge port 30A. In this case, the second water flow Fwb is decelerated because it climbs from the height position of the inner and lower surfaces of the first spout 30A to the height position of the central portion C higher than that. A part of the decelerated second water flow Fwb flows down the back wall surface 62d into the washing water collected in the water storage portion 62. That is, the amount of washing water flowing in from the back wall surface 62d can be increased, the water force of the induced flow Fwg can be further amplified, and the filth discharge capacity can be improved.

The shape of the shelf surface 66 is not particularly limited, and may be formed so that the height position increases from the inner and lower surfaces of the first spout 30A toward the central portion C, or may be formed in a staircase pattern. If the central portion C is higher than the inner and lower surfaces of the first spout 30A, the shelf surface 66 is a portion whose height position becomes lower from the first spout 30A side toward the central portion C side between them. May include.

(5) Refer to FIGS. 3 and 7. The toilet bowl 12 is formed so that the width W1 at the center of the shelf surface 66 located behind the water reservoir 62 in the left-right direction is smaller than the width W2 of the first spout 30A. The width W2 of the first spout 30A may be the width of the lowermost surface of the first spout 30A or the maximum width of the first spout 30A. When the above relationship is satisfied, of the wash water of the second water flow Fwb that swivels the shelf surface 66 behind the water reservoir 62 and heads toward the right side region 74, the wash water that falls from the back wall 62d to the water reservoir 62. The amount can be increased and the water force of the induced flow Fwg can be further amplified. That is, while the cleaning water of the second water flow Fwb reaches the right side region 74 to ensure the cleaning performance of the right side region 74, the water force of the induced flow Fwg can be further amplified to improve the filth discharge capacity.

(6) See FIGS. 8-10. The toilet bowl portion 18 has a connecting surface 80 that connects the shelf surface 66 and each vertical wall surface of the water storage portion 62. The connecting surface 80 has a convex curved surface shape in which the shelf surface 66 has a singular radius of curvature in a cut surface perpendicular to the front-rear direction X. The connecting surface 80 is provided at least in the rear portions of the left side region 72 and the right side region 74 of the filth receiving surface 60. The connecting surface 80 of the present embodiment is provided so as to be continuous from the rear side region 70 of the filth receiving surface 60 to the left side region 72 and the right side region 74.

The positions A to F and B'to F'in FIG. 10 correspond to the positions A to F and B'to F'in FIG. In the toilet bowl 12, in the same front-rear position, the radius of curvature of the connecting surface 80 in the left side region 72 (the right connecting surface 80 in FIG. 9) is the same as the radius of curvature of the connecting surface 80 in the right side region 74 (the left connecting surface 80 in FIG. 9). ) Is formed to be larger than the radius of curvature. In other words, in the same front-rear direction, at positions where the distances from the left-right center in the left-right direction are equal, the connecting surface 80 in the left side region 72 is lower than the connecting surface 80 in the right side region 74, that is, the upper surface. The distance from the upper surface 20b of the portion 20 becomes longer (see FIG. 9). In the present embodiment, these relationships are established not only at the position of the front-rear direction X that overlaps the first spout 30A in the left-right direction Y, but also at the position of the front-rear direction X that does not overlap the first spout 30A in the left-right direction Y. This position may be rephrased as the position in the front-rear direction X on the front side of the first spout 30A.

As a result, in the same front-rear position, the range in the left-right direction in which the connecting surface 80 is formed in the left side region 72 is narrower than the range in the left-right direction in which the connecting surface 80 is formed in the right side region 74. That is, the connecting surface 80 in the left side region 72 is formed relatively narrow in the left-right direction, and the connecting surface 80 in the right side region 74 is formed relatively wide in the left-right direction.

In this case, the fifth water flow is more likely to flow into the water reservoir 62 than in the case where the connecting surface 80 in the left side region 72 is formed relatively wide in the left-right direction. As a result, a stronger induced flow Fwg can be formed, and the filth discharge capacity can be improved.

Further, in this case, more of the second water flow Fwb that has reached the right side region 74 can be merged with the third water flow Fwc as compared with the case where the connecting surface 80 in the right side region 74 is formed relatively narrow in the left-right direction. .. As a result, the amount of wash water flowing into the reservoir 62 from the front increases, the water force of the induced flow Fwg is further amplified, and the filth discharge capacity can be improved.

(7) See FIG. 7. The toilet bowl 12 includes a scattering suppression wall 90 extending in the water discharge direction from the outer edge 36 of the first water discharge port 30A on the central side of the toilet bowl portion 18. The upper end of the shatterproof wall 90 is continuous with the upper surface portion 20. The scattering suppression wall 90 of the present embodiment extends only from the upper side of the outer edge 36. The scattering suppression wall 90 of the present embodiment extends farther toward the upper side. Therefore, the lower surface 90a of the shatterproof wall 90 has a curved shape. The scattering suppression wall 90 suppresses the winding up of the washing water that may occur immediately after exiting the first spout 30A. As a result, it is possible to prevent the washing water from being scattered on the upper surface b of the upper surface portion 20 and the buttocks of the user.

(8) Refer to FIGS. 3 and 11 to 12. The first water passage 34A has a minimum area portion 32 which is a portion having the smallest cross-sectional area. The area of the minimum area portion 32 is designed and manufactured so that the flow rate of the washing water discharged from the first spout 30A becomes a desired flow rate. For example, when the vertical dimension of the first spout 30A is larger than the vertical dimension of the minimum area portion 32, such as when the first spout 30A is vertically long as in the configuration of (1), the minimum area portion 32 to the first spout It is necessary to expand the vertical dimension of the first channel 34A while heading toward the water port 30A.

In the comparative example, the first water passage 34A includes a small dimension portion 50 having the same vertical dimension as the minimum area portion 32 and a large dimension portion 52 having the same vertical dimension as the first spout 30A (see FIG. 12). ). In the comparative example, the small dimension portion 50 and the large dimension portion 52 are continuous. Therefore, the vertical dimension of the first water passage 34A suddenly changes from the vertical dimension of the minimum area portion 32 to the vertical dimension of the first spout 30A. In this case, it is difficult for the washing water to flow into the upper portion 52a of the upstream end of the large-sized portion 52, and the air contained in the washing water collects. The accumulated air is contained in the washing water as large bubbles at a certain timing, and is discharged from the first spout 30A. The plosive sound of the exhaled air bubbles bursting can be offensive to the user.

On the other hand, the first water passage 34A of the present embodiment includes a gradual change expansion portion 54 between the small dimension portion 50 and the large dimension portion 52 (see FIG. 11). The inner upper surface 54a of the gradual change expansion portion 54 is an inclined surface whose position becomes higher toward the downstream side. That is, the vertical dimension of the gradual change expansion portion 54 gradually increases toward the downstream side. In this case, since there is no portion such as the upper portion 52a of the upstream end of the large-sized portion 52 of the comparative example where the washing water is difficult to flow, the accumulation of air in the first water passage 34A is suppressed. Therefore, it is prevented that large bubbles are contained in the washing water and discharged from the first spout 30A.

(9) See FIG. In FIG. 13, the flow of the washing water in the first water passage 34A is indicated by an arrow. The first channel 34A includes a first portion 84 extending approximately to the left front from the common channel 38, a second portion 86 extending forward from the first portion 84, and a third portion 88 extending substantially to the right rear from the second portion 86. And, including. The third portion 88 is not connected to the front end portion of the second portion 86, but is connected to a position slightly rearward from the front end portion. The flow path width W3 in the left-right direction on the front side of the second portion 86 gradually widens from the front end portion toward the rear, in other words, as it approaches the third portion 88 in the front-rear direction from the front end portion. On the front side of the second part 86, at least in the widest part of the flow path width W3 ( _{indicated by the flow path width W3 max} ), the flow path width W4 in the left-right direction on the rear side of the second part 86 and the third part 88 The flow path width is wider than W5. In this case, the washing water that has flowed from the first portion 84 to the rear end portion of the second portion 86 flows through the second portion 86 toward the front end portion thereof, is folded back in the second portion 86, and then reaches the third portion 88. It flows in. Therefore, the substantial channel length of the first channel 34A is longer than when the third portion 88 is connected to the front end portion of the second portion 86. The longer the channel length of the first channel 34A, the greater the flow path resistance of the first channel 34A, and the deceleration of the wash water flowing through the first channel 34A. Further, the washing water flowing through the second portion 86 toward the front end portion and the washing water returning in the second portion 86 interfere with each other, so that the washing water flowing through the first water passage 34A is decelerated. That is, the second portion 86 and the third portion 88 function as a deceleration unit that decelerates the washing water to a desired flow rate.

(10) Refer to FIGS. 14 to 16. The inner and lower surfaces of the first water passage 34A are a first horizontal region 42A continuous with the inner and lower surfaces of the first spout 30A, and a first lower region provided on the upstream side of the first horizontal region 42A in the first water passage 34A. Includes 44A and. The inner and lower surfaces of the second water passage 34B are a second horizontal region 42B continuous with the inner and lower surfaces of the second water discharge portion 28B, and a second lower region provided on the upstream side of the second horizontal region 42B in the second water passage 34B. Includes 44B and. In FIG. 14, the axial directions of the lower regions 44A and 44B are indicated by broken lines. The axial direction here means a direction along the central axis of the first water passage 34A and the second water passage 34B mentioned.

The first horizontal region 42A and the second horizontal region 42B are provided parallel to the horizontal plane. The term "parallel" here includes not only the case where it is geometrically perfectly parallel to the horizontal plane but also the case where it is inclined in the range of 0 ° to 1 ° with respect to the horizontal plane.

The first low region 44A is provided at a lower position than the first horizontal region 42A. The first low-level region 44A of the present embodiment is continuous with the upstream end portion of the first horizontal region 42A without forming a step portion with the first horizontal region 42A. The second low region 44B is provided at a position lower than the second horizontal region 42B. The second low-level region 44B of the present embodiment is continuous with the upstream end portion of the second horizontal region 42B without forming a step portion with the second horizontal region 42B.

The first low-level region 44A and the second low-level region 44B of the present embodiment are inclined surfaces whose positions are higher toward the downstream side. The first low region 44A and the second low region 44B may be either a flat surface or a curved surface. The first low-level region 44A and the second low-level region 44B of the present embodiment are formed so that the inclination angles with respect to the horizontal plane are the same. The inclination angle is, for example, in the range of 2 ° or more and 5 ° or less.

On the inner and lower surfaces of the common water channel 38, a recess 48 that is recessed downward is formed at the branch point 40 of the first water channel 34A and the second water channel 34B.

The upstream end of the first low region 44A and the upstream end of the second low region 44B are provided at the same height position (see FIG. 15). The downstream end of the first low region 44A and the downstream end of the second low region 44B are provided at the same height position. The first horizontal region 42A and the second horizontal region 42B are provided at the same height position (see FIG. 16). The inner and lower surfaces of the first spout 30A and the inner and lower surfaces of the second spout 30B are provided at the same height position. The height position here means a position in the vertical direction Z.

The first water passage 34A and the second water passage 34B have an axial length of the first low region 44A (hereinafter referred to as a first length) and an axial length of the second low region 44B in a plan view. It is formed so that it is equivalent to the length (hereinafter referred to as the second length). The term "equivalent" as used herein includes not only the case where the two objects to be compared are the same, but also the case where they are almost the same. The "substantially the same case" here includes a case where the difference value between the two to be compared is within ± 5% of one size (here, the first length L1).

Consider a situation in which the supply of wash water to the water passages 34A and 34B is completed and a part of the wash water remains as residual water in the water passages 34A and 34B. The water passages 34A and 34B of the present embodiment include horizontal regions 42A and 42B that are continuous with the inner and lower surfaces of the spouts 30A and 30B. The residual water remaining in the horizontal regions 42A and 42B of the water passages 34A and 34B in the vicinity of the spouts 30A and 30B becomes difficult to flow toward the spout side due to its own weight. Therefore, the amount of residual water in the water passages 34A and 34B flowing out from the spouts 30A and 30B can be reduced as compared with the case where the downward slope surface is provided on the inner and lower surfaces of the water passages 34A and 34B. This downward slope surface is continuous with the inner and lower surfaces of the water discharge ports 30A and 30B, and has a downward slope toward the water discharge portions 28A and 28B.

The residual water in the water passages 34A and 34B is in the form of a film. The thinner the residual water, the easier it is for it to move in random directions under the influence of surface tension. Suppose that horizontal regions 42A and 42B are provided in the entire inner and lower surfaces of the water passages 34A and 34B. In this case, the thickness of the residual water on the horizontal regions 42A and 42B tends to be close to constant as a whole. Therefore, the residual water in the entire inner and lower surfaces of the water passages 34A and 34B may be easily moved due to the influence of surface tension, and may flow out from the water passages 34A and 34B through the spouts 30A and 30B.

On the other hand, a part of the water passages 34A and 34B of the embodiment includes the lower regions 44A and 44B. The thickness of the residual water on the lower regions 44A and 44B is thicker than the thickness of the residual water on the horizontal regions 42A and 42B. Therefore, the residual water on the lower regions 44A and 44B is more difficult to move due to the influence of surface tension than the residual water on the horizontal regions 42A and 42B. Therefore, the amount of residual water that may move under the influence of surface tension can be reduced as compared with the case where the horizontal regions 42A and 42B are provided in the entire area of the water passages 34A and 34B. Along with this, the amount of residual water in the water passages 34A and 34B flowing out from the spouts 30A and 30B can be reduced.

Combined with the above, it is possible to shorten the period during which the streak-like water continues to flow due to the residual water in the water passages 34A and 34B. Along with this, it is possible to suppress the deterioration of the appearance due to the cleaning of the toilet bowl.

Consider a case where a cleaning tool such as a cloth is pushed from the outside of the spouts 30A and 30B into the back side of the water passages 34A and 34B. In this case, in the case where the water passages 34A and 34B are provided on the downward slope surface continuous with the spouts 30A and 30B, the cleaning tool is likely to be caught on the downward slope surface. On the other hand, according to the present embodiment, since the horizontal regions 42A and 42B continuous with the spouts 30A and 30B are provided in the water passages 34A and 34B, the above-mentioned downhill inclined surface is provided in the water passages 34A and 34B. Compared with this, it becomes easier to push the cleaning tool to the back side, and good cleaning performance can be obtained.

In order to adjust the flow of the washing water to be discharged from the spouts 30A and 30B, it is desirable that the dimensions of the spouts 30A and 30B in the vertical direction Z be constant in the axial direction. Suppose that a downward slope surface continuous with the spouts 30A and 30B is provided on the inner and lower surfaces of the water passages 34A and 34B. In this case, if the dimensions of the water spouts 30A and 30B in the vertical direction Z are made constant, the shapes of the inner and lower surfaces and the inner upper surfaces of the water spouts 30A and 30B become complicated. Along with this, the number of places where the washing water hits the spouts 30A and 30B tends to increase, which causes the flow of the washing water discharged from the spouts 30A and 30B to become unstable. On the other hand, horizontal regions 42A and 42B are provided on the inner and lower surfaces of the water passages 34A and 34B of the present embodiment at locations continuous with the spouts 30A and 30B. Therefore, as compared with the case where the downward inclined surface is provided on the inner and lower surfaces of the water passages 34A and 34B, the dimensions of the water discharge ports 30A and 30B in the vertical direction Z can be made constant by a simple structure. Along with this, the number of places where the washing water hits the spouts 30A and 30B can be reduced, and the flow of the washing water discharged from the spouts 30A and 30B can be easily stabilized.

The above horizontal regions 42A and 42B and lower regions 44A and 44B are provided in the first water passage 34A and the second water passage 34B, respectively. Therefore, even when there are a plurality of water passages 34A and 34B, the amount of residual water in the water passages 34A and 34B flowing out from the spouts 30A and 30B can be reduced as described above.

The first length L1 is equivalent to the second length L2. Therefore, the inner and lower surfaces of the spouts 30A and 30B can be arranged at the same height position while making the inclination angle of the ascending inclined surface 46 formed by the lower regions 44A and 44B the same. By making the inclination angles of the ascending inclined surfaces 46 of the lower regions 44A and 44B the same, in the 3D CAD (Computer-Aided Design) model, the surface data corresponding to the lower regions 44A and 44B are displayed in the left-right direction Y. It can be easily obtained by inverting. Along with this, the burden of drafting work can be reduced.

In addition to this, since the inner and lower surfaces of the spouts 30A and 30B can be arranged at the same height position, it is not necessary to provide many portions having a gradient in the circumferential direction in the toilet bowl portion 18 of the toilet bowl 12. Along with this, the shape of the toilet bowl portion 18 can be simplified, and good manufacturability can be obtained.

The lower regions 44A and 44B of the water passages 34A and 34B are uphill slopes 46 continuous with the horizontal regions 42A and 42B. Therefore, there is no stepped portion at the boundary between the low-level regions 44A and 44B and the horizontal regions 42A and 42B. Therefore, when a foreign matter enters the water passages 34A and 34B, the foreign matter can be easily flowed out smoothly, and the foreign matter can be prevented from remaining.

(11) See FIG. The toilet bowl 12 is configured so that the following (a) to (f) are satisfied with respect to the flow velocity and the amount of washing water.

(A) The flow velocity of the washing water discharged from the first spout 30A is slower than the flow velocity of the washing water discharged from the second spout 30B. In this case, the flow velocity of the first water flow Fwa is relatively slow, and the flow velocity of the third water flow Fwc is relatively high. The first water flow Fwa, which has a relatively slow flow velocity, does not easily wrap around to the right standing wall surface 62c, and therefore most of the first water flow Fwa flows into the water reservoir 62 along the back standing wall surface 62d. As a result, the water force of the induced flow Fwg is amplified. The third water flow Fwc, which has a relatively high flow velocity, thoroughly cleans the front region 76, which is a wide region on the front side of the filth receiving surface 60 to which filth tends to adhere. A part of the third water flow Fwc having a relatively high flow velocity travels backward in the left side region 72 after cleaning the front region 76 due to the high flow velocity and centrifugal force, and flows into the water reservoir 62 from the rear. As a result, the water force of the induced flow Fwg is further amplified. That is, when the above relationship is satisfied with respect to the flow velocity of the washing water discharged from the spouts 30A and 30B, the toilet bowl 12 having high cleaning property of the filth receiving surface 60 and high filth discharging ability can be obtained. Therefore, the water force of the induced flow Fwg is amplified, and the filth discharge capacity is improved.

(B) The amount of wash water discharged from the first spout 30A is larger than the amount of wash water from the second spout 30B that joins the first spout 30A. That is, Fwa + Fwb> Fwd is established. In this case, the fourth water stream Fwd collides with a water stream having a larger amount of water than itself, so that it is likely to be repelled. Therefore, more fourth water flow Fwd forms a fifth water flow Fwe that flows into the water reservoir 62 from the rear.

(C) The total amount of the washing water discharged from the first spout 30A and the washing water from the second spout 30B joining the first spout 30A is larger than the amount of the washing water discharged from the second spout 30B. That is, Fwa + Fwb + Fwe + Fwf> Fwc + Fwd is established. By increasing the amount of wash water flowing through the rear region 70, the amount of water flowing into the water reservoir 62 from the rear can be increased.

(D) The amount of wash water discharged from the second spout 30B is larger than the amount of wash water discharged from the first spout 30A. In this case, the front side region 76, which is a wide area on the front side of the filth receiving surface 60, can be thoroughly washed with the washing water having a relatively large amount of water from the second spout 30B. Further, if the flow velocity of the washing water is high, a part of the washing water moves backward in the left side region 72 after washing the front side region 76 by the high flow velocity and the centrifugal force, and flows into the water reservoir 62 from the rear. As a result, the water force of the induced flow Fwg is further amplified. That is, when the above relationship is satisfied with respect to the amount of wash water discharged from the spouts 30A and 30B, the toilet bowl 12 having high cleanability of the filth receiving surface 60 and high filth discharge capacity can be obtained. Therefore, the water force of the induced flow Fwg is amplified, and the filth discharge capacity is improved.

(E) Regarding the wash water from the second spout 30B that joins the wash water discharged from the first spout 30A, the amount of wash water that flows into the reservoir 62 from the rear is the shelf behind the reservoir 62. It is larger than the amount of wash water that swirls the surface 66. That is, Fwe> Fwf is established. In this case, more than half of the wash water from the second spout 30B that joins the wash water from the first spout 30A can contribute to the formation of the induced flow Fwg.

(F) The ratio of the amount of wash water flowing into the reservoir 62 from the rear to the amount of wash water discharged from the first spout 30A is 2/3 or more. That is, Fwa / (Fwa + Fwb) ≧ 2/3 is established. In other words, the mainstream first water flow Fwa flows into the water reservoir 62 from the rear. As used herein, the term "mainstream" refers to a water stream formed by 50% or more of the washing water discharged from one spout. In this case, a large amount of wash water can flow into the water reservoir 62 from the rear, and the filth discharge capacity can be improved.

The present disclosure has been described above based on the embodiments. This embodiment is an example, and it will be understood by those skilled in the art that various modifications are possible for each of these components and combinations of each processing process, and that such modifications are also within the scope of the present disclosure. .. Hereinafter, such a modification will be described.

(Modification example 1)
Unlike the embodiment, the toilet bowl 12 may be placed on the floor.

(Modification 2)
Unlike the embodiment, the toilet bowl 12 has only the first water discharge unit 28A and does not have to have the second water discharge unit 28B. See FIG. The first spout 30A of this modified example is formed on the upper side of the left front side portion 18c, which is the portion of the toilet bowl portion 18 on the left side of the left and right center line La and on the front side of the front and rear center line Lb. The first spout 30A may be formed on the upper part of the left rear side portion 18a as in the embodiment. The toilet bowl 12 is configured to form a first water flow Fwa, a second water flow Fwb, a third water flow Fwc, and a fourth water flow Fwd by the washing water discharged from the first water spout 30A.

(1) to (2), (4) to (10), and a part of (11) can also be adopted in this modification. For example, when the configuration of (1) is adopted and the washing water is discharged from the vertically long first spout 30A in a vertically long bundle to form a vertically long bundle of water, the water flow that is not in contact with the filth receiving surface 60 The upper portion is less susceptible to the filth receiving surface 60 and is therefore easy to reach a desired position on the filth receiving surface 60. This makes it possible to form a desired water flow.

(Modification example 3)
The first water discharge unit 28A and the second water discharge unit 28B may be provided at positions opposite to those on the left and right with respect to the positions in the embodiment. In this case, the first water discharge unit 28A and the second water discharge unit 28B invert the first water flow Fwa to the sixth water flow Fwf left and right by discharging the washing water into the toilet bowl portion 18 in the clockwise direction in a plan view. Form a stream of water.

(Modification example 4)
The lower regions 44A and 44B may be provided at positions lower than the horizontal regions 42A and 42B in the water passages 34A and 34B. In order to realize this, the lower regions 44A and 44B may be horizontal planes instead of the ascending inclined surface 46. The lower regions 44A and 44B may form a stepped portion with the horizontal regions 42A and 42B.

The length of the first channel and the length of the second channel may be set to different lengths.

The embodiments and modifications have been described in detail above. In understanding the technical idea that abstracts the embodiment and the modified example, the technical idea should not be construed as being limited to the contents of the embodiment and the modified example. The above-described embodiments and modifications are merely specific examples. Many design changes such as change, addition, and deletion of components can be made in the contents of the embodiment and the modified example. In the above-described embodiment, the content capable of such a design change is emphasized by adding the notation "embodiment". Design changes are allowed even if there is no such notation. The hatching attached to the cross section of the drawing does not limit the material of the object to which the hatching is attached. Any combination of the above components is also valid. For example, any explanatory matter of the modification may be combined with the embodiment.

10 Toilet bowl device, 12 Flush toilet, 18 Toilet bowl, 26 Drainage pipe, 28A 1st spout, 28B 2nd spout, 30A 1st spout, 30B 2nd spout, 60 Sewage receiving surface, 62 reservoir Mizube.

Claims (9)

A toilet bowl portion having a filth receiving surface and a water collecting portion recessed downward from the lower end edge of the filth receiving surface.
A first water spouting portion that forms a water flow that flows into the pool portion from the rear by the washing water discharged from the first spouting port that opens on one side of the toilet bowl portion in the left-right direction.
A flush toilet bowl including a second water spouting portion that discharges washing water having a flow rate faster than that of the first spouting portion from a second spouting port that opens on the other side of the toilet bowl portion in the left-right direction. The flush toilet according to claim 1, wherein the second water discharge portion forms a water flow that propagates through a region of a filth receiving surface on the front side of the water reservoir portion. The first water discharge unit has a first water passage branched from the water passage, and has a first water passage.
The second water discharge unit has a second water passage branched from the water passage.
The flush toilet according to claim 1 or 2, wherein the first water passage has a speed reducing portion for decelerating the washing water flowing through the first water passage. Any one of claims 1 to 3 in which the amount of wash water discharged from the first water discharge unit is larger than the amount of water flow from the second water discharge unit that joins the wash water discharged from the first water discharge unit. The flush toilet described in. The total amount of water, which is the sum of the amount of wash water discharged from the first water discharge unit and the amount of water flowing from the second water discharge unit that joins the wash water discharged from the first water discharge unit, is the second water discharge unit. The flush toilet according to any one of claims 1 to 4, wherein the amount of flush water discharged from the toilet is larger than the amount of flush water discharged from the toilet. The flush toilet according to any one of claims 1 to 5, wherein the amount of wash water discharged from the second spout is larger than the amount of wash water discharged from the first spout. Of the wash water from the second water discharge part that joins the wash water from the first water discharge part, the wash water that flows into the water reservoir without propagating through the area of the filth receiving surface behind the water reservoir. The water-washing type toilet bowl according to any one of claims 1 to 6, wherein the amount of water in the toilet is larger than the amount of washing water traveling in the circumferential direction toward one side. Any one of claims 1 to 7 in which two-thirds or more of the wash water from the first water discharge portion flows into the water reservoir without propagating through the area of the filth receiving surface behind the water reservoir. The flush toilet according to item 1. The flush toilet according to any one of claims 1 to 8, wherein the amount of wash water flowing into the reservoir from behind is larger than the amount of wash water discharged from the first water discharge section.

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