CN114746613A - Flushing toilet - Google Patents

Abstract

The problem to be overcome by the present disclosure is to propose a flush toilet designed to reduce splashing of water in a reverse flow check structure. The flush toilet includes: a bedpan; a drain port for discharging water into the toilet bowl; a water supply passage (3) through which water is supplied from a water supply source to the water discharge port; and a reverse flow check structure (4) for checking a reverse flow of water traveling through the water supply passage (3). The reverse flow check structure (4) has: a water inlet port (410) in communication with the water discharge port; a water receiving wall (5) through which the water inlet port (410) is provided in a portion of the water receiving wall (5); and a water outlet port (400) spaced apart from the water inlet port (410) and the water receiving wall (5) and configured to guide water supplied from the water supply source toward the water inlet port (410). The water receiving wall (5) is provided with a water adhesion reducing portion (9) in a portion thereof located below the water inlet port (410) to reduce the chance of water adhering to the lower end surface (520) of the water receiving wall (5).

Description

Flushing toilet

Technical Field

The present disclosure relates generally to a toilet bowl, and more particularly, to a toilet bowl provided with a reverse flow check structure for a water supply path supplying water to a bowl.

Background

Patent document 1 discloses a flush toilet provided with a reverse flow check structure for a water supply passage for supplying water to a toilet bowl. This reverse flow check structure includes: a water inlet port communicating with a water discharge port provided for the bedpan; and a water outlet port for guiding water supplied from the water supply source toward the water inlet port. The water inlet port is disposed on a locus of water flowing out through the water outlet port.

In the flush toilet of patent document 1, a part of the water flowing out through the water outlet port is received by the wall surrounding the water inlet port and falls down along the wall. At this time, a certain amount of water sometimes adheres to the lower end surface of the wall due to surface tension.

In this state, if the pressure of the water flowing out through the water outlet port is lower than a predetermined value, the water flowing out through the water outlet port collides with the water adhered to the lower end surface of the wall. This can cause the attached water to splash around and reach as far outside of the water reservoir positioned below the reverse flow check structure.

CITATION LIST

Patent document

Patent document 1: WO 2019/097966A1

Disclosure of Invention

It is an object of the present disclosure to provide a flush toilet that reduces splashing of water in a reverse flow check structure.

A flush toilet according to one aspect of the present disclosure includes: a bedpan for receiving excrement; a drain port for discharging water into the toilet bowl; a water supply passage through which water is supplied from a water supply source to the water discharge port; and a reverse flow check structure provided for the water supply passage and configured to check a reverse flow of water traveling through the water supply passage. The reverse flow check structure has: a water inlet port in communication with the water discharge port; a water receiving wall through which the water inlet port is provided in a portion thereof; and a water outlet port spaced apart from the water inlet port and the water receiving wall and configured to guide water supplied from the water supply source toward the water inlet port. The water receiving wall is provided with a water adhesion reducing portion in a portion thereof positioned below the water inlet port. The water adhesion reducing portion reduces the chance of water adhering to the lower end face of the water receiving wall.

Drawings

FIG. 1 is a perspective view illustrating a toilet bowl according to an exemplary embodiment of the present invention;

FIG. 2 is a perspective view showing a reverse flow check structure and a bowl of a toilet;

FIG. 3 is a perspective view showing the reverse flow check structure and its surroundings;

FIG. 4A is a cross-sectional view showing the reverse flow check structure and its surrounding portions taken along a vertical plane;

FIG. 4B is a side view showing the body portion of the reverse flow check structure;

FIG. 5A is a side view showing a first variation of the body portion of the reverse flow check structure;

FIG. 5B is a side view showing a second variation of the body portion of the reverse flow check structure;

FIG. 5C is a side view showing a third variation of the body portion of the reverse flow check structure; and

FIG. 5D is a side view showing a fourth variation of the body portion of the reverse flow check structure.

Detailed Description

1. Summary of the invention

Fig. 1 shows a toilet 1 according to an exemplary embodiment. The flush toilet 1 includes: a bedpan 23 for receiving excrement; a drain port 253 that drains water into the bowl 23; a water supply passage 3 through which water is supplied from a water supply source to the drain port 253; and a reverse flow check structure 4 provided for the water supply passage 3 and configured to check a reverse flow of water traveling through the water supply passage 3. The reverse flow check structure 4 has: a water inlet port 410 communicating with the water discharge port 253; a water receiving wall 5 through which the water inlet port 410 is provided in a portion of the water receiving wall 5; and a water outlet port 400 spaced apart from the water inlet port 410 and the water receiving wall 5 and configured to guide water supplied from the water supply source toward the water inlet port 410. As shown in fig. 4A and 4B, the water receiving wall 5 is provided with a water adhesion reducing portion 9 in a portion thereof positioned below the water inlet port 410. The water adhesion reducing portion 9 reduces the chance of water adhering to the lower end surface 520 of the water receiving wall 5.

In the flush toilet 1 according to the exemplary embodiment having such a configuration, the water adhesion reducing part 9 may reduce the chance of water adhering to the lower end surface 520 of the water receiving wall 5 due to surface tension when the water receiving wall 5 receives a portion of water directed from the water outlet port 400 toward the water inlet port 410. Thus, the flush toilet 1 according to this exemplary embodiment can reduce the chance that water guided from the water outlet port 400 toward the water inlet port 410 collides with water adhering to the lower end surface 520 of the water receiving wall 5 to cause the water adhering to the lower end surface 520 to splash around. Therefore, the flush toilet 1 according to this exemplary embodiment can reduce splashing of water in the reverse flow check structure 4.

2. Details of

Next, the flush toilet 1 according to the exemplary embodiment shown in fig. 1 to 4 will be described in further detail. As shown in fig. 1, the flush toilet 1 is installed in a toilet room 7. The rear wall 74 of the toilet 7 is provided with a water supply pipe 71 as a water supply source. A water stop valve 72 is provided at a downstream end portion of the water supply pipe 71. Also, the floor 75 of the toilet 7 is provided with a drain pipe 73 leading to a sewer pipe.

When the flush toilet 1 is installed in the toilet room 7, the connecting member 6 leading to the water supply passage 3 is connected to the water stop valve 72 via the pipe 61, and the drain trap 76 leading to the drain pipe 232 of the toilet bowl 23 is connected to the drain pipe 73. Communicating the water stop valve 72 with the connection member 6 allows water to be supplied from the water supply pipe 71 (i.e., water supply source) to the water supply passage 3 of the flush toilet 1.

The flush toilet 1 includes a toilet body 2, a water supply passage 3, and a reverse flow check structure 4. In fig. 1, a direction directed from the flush toilet 1 toward the rear wall 74 of the lavatory 7 and aligned with the horizontal plane is defined herein as a "rearward direction", and an opposite direction thereof is defined herein as a "forward direction". In addition, the left-right direction is defined herein with respect to a user who faces rearward at the front of the flush toilet 1.

The toilet body 2 is a main body of the flush toilet 1. The toilet body 2 includes a plurality of outer parts 21, an inner part 22, a water reservoir 8 (see fig. 2), a toilet seat (not shown), and a toilet lid 26.

A plurality of outer parts 21 form the outer shell of the toilet bowl 1. These outer parts 21 are mounted on a frame (not shown). In this embodiment, the outer member 21 includes a skirt 211 on which the inner member 22 is supported, a rear lower member 213 positioned rearward of the skirt 211, and a rear upper member 212 positioned above the rear lower member 213. The toilet seat and the toilet lid 26 are mounted on the rear upper member 212 so as to be rotatable about an axis parallel to the left-right direction.

The inner part 22 is arranged inside the space enclosed by the outer part 21 and the toilet lid 26. The inner part 22 is supported by the upper end of the skirt 211. As shown in fig. 2, the inner member 22 includes a bowl 23, a drain portion 25, and a support portion 24.

The bedpan 23 receives excrement (i.e., urine and feces) discharged by the user. The bedpan 23 is formed in a cup shape with an upper end being open and a lower end including a drain pipe 232. The inner surface of the bowl 23 (hereinafter referred to as "bowl surface 231") slopes downward toward the front end of the drain pipe 232. The water discharged from the drain portion 25 swirls along the bowl surface 231 about an axis parallel to the vertical direction. As shown in fig. 1, the rear end portion of the drain pipe 232 is connected to the drain pipe 73 via the drain trap 76.

The drain trap 76 prevents unpleasant odors from flowing back from the drain pipe 73 toward the bowl and also prevents, for example, sanitary insects from attempting to enter the bowl 23 from the drain pipe 73. The drainage trap 76 may be implemented as a so-called "S-trap," which is an S-pipe, or, for example, a movable trap. The movable trap may be a flexible hose connected to the drain pipe 232 of the bowl 23, for example. The distal end of the flexible tube may be switched in its state by a motor, for example from a distal end facing up state to a distal end facing down state and vice versa.

The drain 25 drains water onto the bowl surface 231. The drain 25 is adjacent to the opening of the bowl 23. The drain portion 25 includes a drain nozzle 251, a pair of upright walls 252, and a drain port 253.

The drain nozzle 251 is a nozzle for discharging water supplied through the water supply passage 3. The drain nozzle 251 is disposed between a pair of upstanding walls 252. The pair of upright walls 252 direct water discharged from the discharge nozzle 251 so that the water swirls along the bowl surface 231. The drain port 253 drains water onto the bowl 23. In this embodiment, the drain port 253 is an opening surrounded by a forward end portion of the inner upstanding wall 252 of the bowl 23 and a portion of the opposing outer upstanding wall 252 of the bowl 23. Alternatively, the drain port 253 may also be an opening located at the tip of the drain nozzle 251.

The support portion 24 extends outwardly from the outer edge of the opening of the bowl 23. The support portion 24 is supported by the upper end portion of the skirt portion 211. The bowl 23 and the drain 25 are fixed to the outer member 21 via a support portion 24.

The water supply passage 3 guides water supplied from the water supply source toward the drain portion 25. The upstream end of the water supply passage 3 leads to the connecting member 6, and the downstream end of the water supply passage 3 leads to the drain nozzle 251. The water supply path 3 is provided with a water stop valve (not shown) and a constant flow valve (not shown) so that water flows at a constant flow rate. Thus, even if the water pressure of the water supplied from the water supply source varies to some extent, the water can be discharged into the bedpan 23 through the drain port 253 at a constant flow rate.

The water supply passage 3 is provided with a reverse flow check structure 4. The reverse flow check structure 4 checks the reverse flow of the water traveling through the water supply path 3. Even when the water level of the water stored in the toilet bowl 23 rises, for example, to such an extent that the drain portion 25 is immersed in the rising water, the chance that the water stored in the toilet bowl 23 flows back to the water supply source through the water supply passage 3, for example, can be reduced.

As shown in fig. 3, 4A and 4B, the reverse flow check structure 4 includes an outlet pipe 40, an inlet pipe 41, a water receiving wall 5, a splash reduction portion 42, and a cover wall 43.

The water outlet pipe 40 is a pipe communicating with a water supply source (i.e., a water supply pipe 71), and serves to guide water supplied from the water supply source toward the water inlet pipe 41. Outlet pipe 40 is a pipe that introduces water into reverse flow check structure 4. The downstream end face of the outlet pipe 40 has an outlet port 400. The water outlet port 400 is an opening through which water traveling through the water outlet pipe 40 flows out and which guides water supplied from the water supply source toward the water inlet port 410. The outlet pipe 40 is supported by a support 80 projecting upwardly from the reservoir 8. The central axis 401 of the outlet pipe 40 is aligned with the horizontal plane and intersects the vertical line (in other words, the vertical plane) at right angles. An inner peripheral surface 402 at one end of the outlet pipe 40 adjacent to the outlet port 400 is tapered such that its flow passage area decreases as the distance from the outlet port 400 decreases. This enables to increase the flow rate of water flowing out through the outlet port 400.

The water inlet pipe 41 is a pipe that receives water flowing out through the water outlet port 400 and guides the water toward the drain nozzle 251 (see fig. 2). The upstream end of the inlet pipe 41 is connected to the water receiving wall 5. The downstream end of the water inlet pipe 41 leads to the drain nozzle 251, for example, via a hose.

The upstream end face of the water inlet pipe 41 has a water inlet port 410. The water inlet port 410 is provided through a portion of the water receiving wall 5. More specifically, a portion of a surface (i.e., a right surface) of the water receiving wall 5 facing the water outlet port 400 is provided with a water inlet port 410.

The water inlet port 410 communicates with the water discharge port 253. The central axis 411 of the inlet pipe 41 is aligned with the horizontal plane and positioned on the extension of the central axis 401 of the outlet pipe 40. That is, the water inlet port 410 is disposed on a trajectory of water flowing out through the water outlet port 400 at least a predetermined water pressure. The water inlet port 410 is inclined with respect to a central axis 411 of the water inlet pipe 41. The outer circumferential surface of the water inlet port 410 around the opening is inclined downward toward the water outlet port 400 with respect to the horizontal plane such that the portion thereof located closest to the water outlet port 400 in the left-right direction (in other words, in the direction aligned with the trajectory of water) is the lowest portion thereof. This makes it easier for the water inlet port 410 to receive water flowing out through the water outlet port 400 even if the trajectory of such water draws a parabola.

The water receiving wall 5 comprises an upper wall portion 50, a middle wall portion 51 and a lower wall portion 52. The upper wall portion 50 is parallel to the vertical plane. The intermediate wall portion 51 is continuous with the lower end of the upper wall portion 50 and is inclined downward such that the lowest portion thereof is positioned at the right end (i.e., closest to the water outlet port 400). The lower wall portion 52 is continuous with the lower end of the intermediate wall portion 51 and is parallel to the vertical plane.

The intermediate portion of the intermediate wall portion 51 in the front-rear direction is provided with a water inlet port 410. The inclination angle formed by the intermediate wall portion 51 with respect to the vertical plane is the same as the inclination angle formed by the outer peripheral edge portion surrounding the opening of the water inlet port 410 with respect to the vertical plane.

As shown in fig. 4B, the water receiving wall 5 has a semicircular shape when viewed from the right. The outer peripheral portion of the water receiving wall 5 is connected to a third covering wall 432 (described later) of the covering wall 43, except for the lower end surface 520.

The portion of the water receiving wall 5 positioned below the water inlet port 410 is provided with a water adhesion reducing portion 9 for reducing the chance of water adhering to the lower end surface 520 of the water receiving wall 5. In this embodiment, the water adhesion reducing portion 9 is a protrusion 90 that protrudes from the lower wall portion 52 of the water receiving wall 5 toward the water outlet port 400 (i.e., to the right). The upper surface of the projection 90 is an inclined surface inclined with respect to the horizontal plane.

In this embodiment, the protrusion 90 has a rectangular plate shape. The projection 90 is inclined such that its front end is positioned at the lowest level. The dimension of the protruding portion 90 in the front-rear direction is larger than that in the left-right direction. The upper surface of the projection 90 is a flat surface and is inclined toward the front end (i.e., such that the front end thereof is positioned at the lowest level).

The front and rear ends of the projection 90 are spaced apart from the third covering wall 432. The water received at the water receiving wall 5 travels forward along the upper surface of the protrusion 90, and is mostly guided toward the front end of the upper surface of the protrusion 90. This makes it easier for water to fall from the protrusion 90 due to its own weight, thereby reducing the chance of water adhering to the lower end surface 520 of the water receiving wall 5 due to surface tension.

The splash reduction portion 42 reduces the chance of splash water adhering to the water outlet port 400 while water flowing out through the water outlet port 400 is entering the water inlet port 410. The splash reduction portion 42 is disposed between the water outlet port 400 and the water inlet port 410. The splash reduction portion 42 includes a first water interception plate 44 and a second water interception plate 45.

The first cutoff plate 44 faces the water receiving wall 5 and the water inlet port 410 and receives water splashed from the water receiving wall 5. The first cut-off plate 44 is spaced apart from the water receiving wall 5. An opening 46 is provided between the lower end of the first cut-off plate 44 and the lower end of the water receiving wall 5. Water received at either the water receiving wall 5 or the first cut-off plate 44 falls through the opening 46 into the reservoir 8.

The first cut-off plate 44 is aligned with the vertical plane and intersects (e.g., at right angles in this embodiment) the central axes 401, 411 of the outlet pipe 40 and the inlet pipe 41, respectively. The first cutoff plate 44 is provided with a first water passing hole 440 penetrating the first cutoff plate 44. The first water through hole 440 has a diameter equal to or greater than that of the water outlet port 400 and equal to or smaller than that of the water inlet port 410.

The second cut-off plate 45 faces the outlet port 400 and the first cut-off plate 44. The second cut-off plate 45 receives not only the water that has flowed through the water outlet ports 400 and that has bounced and splashed back from the first cut-off plate 44, but also the water that has flowed through the water outlet ports 400, that has bounced and splashed back from the water receiving wall 5, and that has then passed through the first water passing holes 440 of the first cut-off plate 44. The second cut-off plate 45 is aligned with the vertical plane and intersects (at right angles in this embodiment) the central axes 411, 401 of the inlet pipe 41 and the outlet pipe 40, respectively. That is, the second cutoff plate 45 is parallel to the first cutoff plate 44. The second water intercepting plate 45 has a second water passing hole 450 passing through the second water intercepting plate 45. The diameter of the second water through hole 450 is equal to or greater than the diameter of the water outlet port 400 and equal to or smaller than the water inlet port 410. In this embodiment, the diameter of the second water through hole 450 is equal to the diameter of the first water through hole 440. Alternatively, the diameter of the second water passing hole 450 may be larger or smaller than the diameter of the first water passing hole 440.

A peripheral wall portion 47 is provided around each of the first and second water passage holes 440 and 450. The peripheral wall portion 47 protrudes from at least a part of the circumference of the first water passage hole 440, 450 in at least one of the left and right directions (in other words, toward the water outlet port 400 and/or toward the water inlet port 410 in a direction coinciding with the trajectory of water). In this embodiment, the peripheral wall portion 47 provided for the first water passage hole 440 protrudes to the left and right from the entire circumference of the first water passage hole 440. On the other hand, the peripheral wall portion 47 provided for the second water passing hole 450 protrudes rightward only from the entire circumference of the second water passing hole 450.

Alternatively, the peripheral wall portion 47 provided for the first water passage hole 440 may protrude only leftward or only rightward from the entire circumference of the first water passage hole 440, as appropriate. Also, the peripheral wall portion 47 provided for the second water passing hole 450 may protrude only leftward or both rightward and leftward from the entire circumference of the second water passing hole 450. Still alternatively, the peripheral wall portion 47 may be provided for only a part of the circumference of the water passage holes 440, 450.

The water that has bounced and splashed back from the water receiving wall 5 toward the first cutoff plate 44 while the water flowing out through the water outlet port 400 is entering the water inlet port 410 collides with the peripheral wall portion 47 and falls downward. Also, even if water travels along the first cutoff plate 44, the water is prevented from entering the first water passage hole 440 by the peripheral wall portion 47. Thus, this may reduce the chance that the water flowing out through the outlet port 400 and rebounded from the water receiving wall 5 flows backward through the first water passing hole 440 toward the outlet port 400.

The covering wall 43 reduces the chance that the water flowing out through the water outlet port 400 bounces off the water receiving wall 5 or the splash reducing portion 42 and splashes toward the outside of the covering wall 43. The covering wall 43 includes a first covering wall 430, a second covering wall 431, and a third covering wall 432.

The first covering wall 430 connects the end (i.e., the left end) of the outlet pipe 40 to the second cut-off plate 45. The first cover wall 430 covers the space between the water outlet pipe 40 and the second water interception plate 45 in the front-rear direction and from above and to the right of the space. The second covering wall 431 connects the second water interception plate 45 to the tip (i.e., the right end) of the peripheral wall portion 47 protruding rightward from the first water passage hole 440. The second covering wall 431 covers the space between the second water interception plate 45 and the peripheral wall portion 47 in the front-rear direction and from above and to the left of the space. The third cover wall 432 connects the first cut-off plate 44 to the water receiving wall 5. The third covering wall 432 covers the space between the first cut-off plate 44 and the water receiving wall 5 in the front-rear direction and from above the space.

In this embodiment, the third covering wall 432 includes a first portion 432a protruding leftward from the first cut-off plate 44 and a second portion 432b protruding rightward from the outer peripheral portion of the water receiving wall 5.

The first covering wall 430 is integrally formed with the outlet duct 40. The first portion 432a of the third covering wall 432, the first cut-off plate 44, the second covering wall 431, and the second cut-off plate 45 are integrally formed with each other. The second portion 432b of the third covering wall 432 and the water receiving wall 5 are also formed integrally with each other.

The second portion 432b of the third covering wall 432, the first covering wall 430, and the first portion 432a of the third covering wall 432 are each provided with a mounting portion 48 that protrudes in the front-rear direction.

The front and rear mounting portions 48 are mounted to a support portion 80 projecting upward from the reservoir 8. This allows the reverse flow check structure 4 to be mounted above the water reservoir 8. The water reservoir 8 is supported by the frame of the toilet body 2, and is covered by the rear upper member 212 (see fig. 1) and hidden behind the rear upper member 212.

The water that has rebounded from the cover wall 43, the splash reduction portion 42, or the water receiving wall 5 is received at the reservoir 8. The bottom of the reservoir 8 is provided with a drainage hole 81, and a pipe 82 such as a tube is connected to the drainage hole 81. Tube 82 may be connected to, for example, bowl 23. This allows water received at the reservoir 8 to flow into the bowl 23. Alternatively, the pipe 82 may also be connected to, for example, the drain trap 76 or the drain pipe 73. Still alternatively, the water received at the reservoir 8 may also be discharged directly onto the floor 75 of the lavatory (see fig. 1). The reservoir 8 includes a peripheral wall 83. The reverse flow check structure 4 is provided inside the peripheral wall 83 when viewed in plan, as shown in fig. 3.

The flush toilet 1 includes an overflow 84 disposed inside the water reservoir 8 in plan view. The overflow portion 84 has a cylindrical shape and protrudes upward from a region of the bottom surface of the water reservoir 8 located inside the peripheral wall 83. The overflow 84 has an overflow opening 840 at the top. The overflow opening 840 is provided at a level higher than the bottom surface of the reservoir 8 but lower than the upper end of the peripheral wall 83. When the required water discharge capacity cannot be satisfied only by the water discharge hole 81 of the reservoir 8, the overflow opening 840 discharges water that has traveled upward inside the peripheral wall 83.

Water that has entered the overflow opening 840 is allowed to flow onto the floor 75 (see fig. 1). Alternatively, water that has entered the overflow opening 840 may also be caused to flow into, for example, the bowl 23, the drain trap 76, or the drain pipe 73.

3. Advantages of

The toilet bowl 1 according to the above-described exemplary embodiment operates as follows when water is supplied into the bedpan 23.

Specifically, when water is supplied into the outlet pipe 40 from the water supply pipe 71 as a water supply source, the water is guided toward the water inlet port 410 through the outlet port 400 of the outlet pipe 40.

The water flowing out through the outlet port 400 passes through the water through holes 450, 440 of the intercepting plates 45, 44 and enters the inlet port 410. Meanwhile, a portion of the water flowing out through the water outlet port 400 may be received at the water receiving wall 5.

The water received at the water receiving wall 5 travels down the surface of the water receiving wall 5 (specifically, the surface thereof facing to the right) and reaches the upper surface of the projection 90. Then, the water travels along the upper surface of the protrusion 90, and the forward flow is guided with most toward the front end portion of the upper surface of the protrusion 90. The water then falls down due to its own weight. So that the water falling from the front end of the upper surface of the projection 90 is received by the reservoir 8 and then discharged through the water discharge hole 81.

Thus, the flush toilet 1 according to this embodiment can reduce the chance of water adhering to the lower end surface 520 of the water receiving wall 5 due to surface tension. Therefore, the flush toilet 1 according to this embodiment reduces the frequency of occurrence of the above-described problem in which water flowing out through the water outlet port 400 collides with water adhering to the lower end surface 520 when having a pressure lower than a predetermined value and splashes the adhering water toward the outside of the peripheral wall 83 of the reservoir 8.

In addition, in the flush toilet 1 according to this embodiment, the protrusion 90 protrudes from the lower wall portion 52 as the lower portion of the water receiving wall 5 toward the water outlet port 400. Thus, the projection 90 serves as an eave (eave). This allows the protrusion 90 to reduce the chance that water flowing out through the outlet port 400 reaches the lower end surface 520 of the water receiving wall 5.

Further, in the flush toilet 1 according to this embodiment, the protrusion 90 is provided to cover the entire lower wall portion 52 of the water receiving wall 5 except for the front and rear end portions thereof, thereby also making it easier to prevent water traveling along the surface of the water receiving wall 5 from reaching the lower end surface 520.

4. Variants

Next, modifications of the flush toilet 1 according to the above-described exemplary embodiment will be explained in sequence. Note that variations to be described below can be employed in appropriate combinations.

The water adhesion reducing portion 9 only needs to be configured to reduce adhesion of water to the lower end surface 520 of the water receiving wall 5 due to surface tension, and does not need to have the structure shown in fig. 4B.

Alternatively, as in a first modification shown in fig. 5A, the water adhesion reducing portion 9 may include a protrusion 90 whose upper surface includes two surfaces inclined with respect to a horizontal plane. In the first modification, the upper surface of the projection 90 has an apex at a point in the front-rear direction. The upper surface of the protrusion 90 includes a surface inclined downward toward the front end as a part positioned forward of the apex and a surface inclined downward toward the rear end as another part positioned rearward of the apex.

Still alternatively, as in a second modification shown in fig. 5B, the water adhesion reducing portion 9 may also include two projections 91, 92 each projecting from the lower wall portion 52 toward the water outlet port 400. The two projections 91, 92 are arranged to be spaced apart from each other in the front-rear direction. The upper surface of the front projection 91 is an inclined surface inclined downward toward the rear end with respect to the horizontal plane. The upper surface of the rear projection 92 is an inclined surface inclined downward toward the front end with respect to the horizontal plane. The second modification makes it easier for water adhering to the surface of the water receiving wall 5 to travel along the respective upper surfaces of the two projections 91, 92, and most of the water is guided toward and falls through the gap between the two projections 91, 92.

Still alternatively, as in a third modification shown in fig. 5C, the water adhesion reducing portion 9 may also be a lower end surface 520 of the water receiving wall 5 that is inclined with respect to the horizontal plane. In the third modification, the lower end surface 520 of the water receiving wall 5 is inclined such that the front end portion thereof is positioned at the lowest level. This makes it easier for water that has been received at the water receiving wall 5 and has reached the lower end surface 520 of the water receiving wall 5 to flow forward along the lower end surface 520, and most of the water is guided toward and falls from the front end portion of the lower end surface 520.

Still alternatively, as in a fourth modification shown in fig. 5D, the water adherence reducing portion 9 may also be a water-repellent surface 93 provided on the water receiving wall 5. In the fourth modification, the surface of the lower wall portion 52 of the water receiving wall 5 (specifically, the surface thereof facing rightward) is a waterproof surface 93. In addition, the lower end surface 520 of the water receiving wall 5 may also be a water-repellent surface 93. The water repellent surface 93 may be formed by any suitable known means. For example, the water-repellent surface 93 may be formed by providing microscopic unevenness to the surface of the lower wall portion 52. Alternatively, the waterproof surface 93 may also be formed by applying a waterproof paint onto the surface of the lower wall portion 52 or fixing a waterproof sheet to the surface of the lower wall portion 52.

Alternatively, the water adherence reducing portion 9 according to the exemplary embodiment shown in fig. 4B and the water adherence reducing portions 9 according to the first to fourth modifications shown in fig. 5A to 5D may be adopted in appropriate combination.

The projections 90, 91, 92 need only have upper surfaces that are inclined with respect to the horizontal plane, and need not have a plate shape.

In addition, as long as the projections 90, 91, 92 have upper surfaces inclined with respect to the horizontal plane, the upper surfaces of the projections 90 do not necessarily incline downward toward the front or rear end, but may also incline downward to the right end (specifically, incline such that the portion thereof closest to the water outlet port 400 is positioned at the lowest level). Similarly, the lower end surface 520 of the water receiving wall 5 does not have to be inclined downward toward the front end, but may be inclined downward toward the rear end, the right end, or the left end.

Further, the upper surfaces of the protruding portions 90, 91, 92 need not be flat surfaces, but may also be surfaces having a difference in height. The upper surfaces of the projections 90, 91, 92 only need to have such a shape as to cause water adhering to the upper surfaces of the projections 90, 91, 92 to travel downward and flow toward the lower end portions of the upper surfaces of the projections 90, 91, 92. Similarly, the lower end surface 520 of the water receiving wall 5 is not necessarily a flat surface, but may be a surface having a difference in height.

In the above-described exemplary embodiment, the opening surrounded by the outer peripheral edge of the water inlet port 410 and the opening surrounded by the outer peripheral edge of the water outlet port 400 are arranged such that their respective central axes are aligned with each other. However, this is merely an example and should not be construed as limiting. Alternatively, if the water flowing out through outlet port 400 draws a parabola, inlet port 410 may be positioned on the parabola.

5. Recall that

As can be seen from the foregoing description of the exemplary embodiment and its variants, the flush toilet (1) according to the first aspect has the following configuration:

specifically, a flush toilet (1) according to a first aspect includes: a bedpan (23) for receiving excrement; a drain port (253) that discharges water into the bowl (23); and a water supply passage (3) through which water is supplied from the water supply source to the drain port (253). The flush toilet (1) according to the first aspect further includes a reverse flow check structure (4) provided for the water supply passage (3) and configured to check a reverse flow of water traveling through the water supply passage (3). The reverse flow check structure (4) has: a water inlet port (410) communicating with the water discharge port (253); a water receiving wall (5) through which the water inlet port (410) is provided in a portion of the water receiving wall (5); and a water outlet port (400) that guides water supplied from the water supply source toward the water inlet port (410). The water outlet port (400) is spaced from the water inlet port (410) and the water receiving wall (5). The water receiving wall (5) is provided with a water adhesion reducing portion (9) in a portion thereof located below the water inlet port (410). The water adhesion reducing section (9) reduces the chance of water adhering to the lower end surface (520) of the water receiving wall (5).

In the flush toilet (1) according to the first aspect having such a configuration, the water adhesion reducing portion (9) can reduce the chance of water adhering to the lower end surface (520) of the water receiving wall (5) when the water receiving wall (5) receives a part of the water flowing out through the water outlet port (400). Thus, the flush toilet (1) according to the first aspect can reduce the chance that water flowing out through the water outlet port (400) collides with water adhering to the lower end surface (520) of the water receiving wall (5) and splashes the adhering water around. Therefore, the flush toilet (1) according to the first aspect can reduce splashing of water in the reverse flow check structure (4).

As can be seen from the foregoing description of exemplary embodiments and variants thereof, the toilet bowl (1) according to the second aspect has the following additional configurations, which can be implemented in combination with the configuration of the toilet bowl (1) according to the first aspect:

specifically, in the flush toilet (1) according to the second aspect, the water adhesion reducing portion (9) is a protrusion (90) that protrudes from the water receiving wall (5) toward the water outlet port (400). The upper surface of the projection (90) is an inclined surface inclined with respect to the horizontal plane.

In the flush toilet (1) according to the second aspect having such a configuration, the inclined upper surface of the protrusion (90) protruding from the water receiving wall (5) toward the water outlet port (400) allows the water received at the water receiving wall (5) to be mostly guided toward the lower end portion of the upper surface of the protrusion (90). Thus, the flush toilet (1) according to the second aspect makes it easier for water received at the water receiving wall (5) to fall.

As can be seen from the foregoing description of the exemplary embodiment and its variants, the toilet bowl (1) according to the third aspect has the following additional configurations, which can be implemented in combination with the configuration of the toilet bowl (1) according to the second aspect:

specifically, in the flush toilet (1) according to the third aspect, the reverse flow check structure (4) further includes a covering wall (43) provided to surround the water receiving wall (5). The projection (90) is spaced apart from the covering wall (43).

In the flush toilet (1) according to the third aspect having such a configuration, the covering wall (43) can prevent water that has been guided from the water outlet port (400) toward the water inlet port (410) and that has collided with the water receiving wall (5) from splashing toward the outside of the water receiving wall (5). In addition, the flush toilet (1) according to the third aspect also allows water that travels downward from the upper surface of the projection (90) to fall through the gap between the projection (90) and the cover wall (43). That is, the covering wall (43) does not hinder the water from falling from the protrusion (90).

As can be seen from the foregoing description of the exemplary embodiment and its variants, the toilet bowl (1) according to the fourth aspect has the following additional configuration, which can be implemented in combination with the configuration of the toilet bowl (1) according to any one of the first to third aspects:

specifically, in the flush toilet (1) according to the fourth aspect, the water adhesion reducing portion (9) is the lower end surface (520) of the water receiving wall (5). The lower end surface (520) is inclined with respect to a horizontal plane.

The flush toilet (1) according to the fourth aspect having such a configuration causes water that has been received at the water receiving wall (5) and has reached the lower end face (520) of the water receiving wall (5) to be guided along the inclined lower end face (520) mostly toward the lower portion of the lower end face (520) and to fall smoothly.

As can be seen from the foregoing description of the exemplary embodiment and its variants, the flush toilet (1) according to the fifth aspect has the following additional configuration, which can be implemented in combination with the configuration of the flush toilet (1) according to any one of the first to fourth aspects:

specifically, in the flush toilet (1) according to the fifth aspect, the water adhesion reducing portion (9) is a water-repellent surface (93) provided on the water receiving wall (5).

In the flush toilet (1) according to the fifth aspect having such a configuration, the water-repellent surface (93) makes it easier for water received at the water receiving wall (5) to fall.

Note that the embodiments described above with reference to the drawings are only exemplary embodiments among various embodiments of the present disclosure, and should not be construed as limiting. Rather, the exemplary embodiments can be readily modified in various ways as appropriate depending on design choice or any other factors without departing from the scope of the present disclosure.

List of reference numerals

1 Water closet

23 bed pan

253 drainage port

3 Water supply passage

4 adverse current non return structure

400 water outlet port

410 water inlet port

5 Water receiving wall

520 lower end surface

43 covering the wall

9 Water adhesion reducing part

90 projection

93 water-proof surface

Claims (5)

1. A flush toilet, comprising:

a bedpan configured to receive waste;

a drain port configured to drain water into the bedpan;

a water supply passage configured to supply water therethrough from a water supply source to the water discharge port; and

a reverse flow check structure provided for the water supply passage and configured to check a reverse flow of water proceeding through the water supply passage,

the reverse flow check structure has:

a water inlet port in communication with the water discharge port;

a water receiving wall through which the water inlet port is disposed in a portion thereof; and

a water outlet port spaced apart from the water inlet port and the water receiving wall and configured to guide water supplied from the water supply source toward the water inlet port,

the water receiving wall is provided with a water adhesion reducing portion in a portion thereof positioned below the water inlet port, the water adhesion reducing portion being configured to reduce the chance of water adhering to a lower end face of the water receiving wall.

2. The water closet of claim 1, wherein the water closet further comprises a cover for covering the water closet

The water adherence reducing portion is a protrusion protruding from the water receiving wall toward the water outlet port, and

the upper surface of the protrusion is an inclined surface inclined with respect to a horizontal plane.

3. The water closet of claim 2, wherein the water closet further comprises a cover for covering the water closet

The reverse flow check structure further comprises a covering wall provided to surround the water receiving wall, and

the protrusion is spaced apart from the cover wall.

4. The toilet of any one of claims 1 to 3, wherein the toilet is adapted to be used with a toilet bowl

The water adhesion reducing portion is the lower end surface of the water receiving wall, which is inclined with respect to a horizontal plane.

5. The toilet of any one of claims 1 to 4, wherein the toilet is adapted to be used with a toilet bowl

The water adhesion reducing portion is a water-repellent surface provided on the water receiving wall.

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