JP7438482B2 - flush toilet - Google Patents

Description

The present invention relates to a flush toilet, and more particularly to a flush toilet that is flushed with flush water supplied from a flush water source and discharges waste.

Conventional flush toilets that are flushed and discharged with flush water supplied from a flush water source have been used, for example, as described in Patent Document 1. A so-called tank-type flush toilet is known in which flush water is supplied to a water conduit and then spouted from only two rim spouts provided on the rim of the toilet main body on the downstream side of the water conduit.
In such conventional flush toilets, unlike flush toilets that push waste inside the bowl with jet water spouted from a jet spout other than the rim spout, the rim water spout that is spouted only from the rim spout Since it is necessary to clean the bowl surface and push dirt out, one of the challenges is how to increase the water force of the rim water discharge.
In addition, in recent tank-type flush toilets, the upper end of the flush water tank is set at a relatively low position, in order to save water and improve the design, so-called low-silhouette type flush toilets. Tanks tend to be preferred. For this reason, so-called low tanks have been developed, in which the highest water level inside the wash water tank is set relatively low, and the head pressure acting on the bottom of the wash water tank is lowered.

Japanese Patent Application Publication No. 2015-190245

However, in the above-mentioned low tank type flush water tank, the lower the maximum water level is set, and the lower the head pressure acting on the bottom of the flush water tank, the lower the water pressure that is applied to the bottom of the flush water tank, the more the flow from the flush water tank to the toilet bowl body. There is a problem in that the force of the wash water supplied to the waterway is weakened.
Therefore, the water force of the rim water discharge is also weakened, and therefore, even when a low tank is used as a wash water tank, it has become a problem to find a way to increase and maintain the water force of the rim water discharge.
In addition, in order to increase the water force of the rim water discharge, it is possible to secure the water force by supplying a large amount of wash water from the wash water tank, but this will affect the cross-sectional area of the water supply channel in the toilet body and the internal It is necessary to increase the space (volume).
However, when the internal space of the headrace is set large in this way, especially when the wash water flows into the headrace from the wash water tank, it mixes with the air in the headrace and bubbles are generated. There is a problem that there is a risk.
In addition, if the cleaning water containing air bubbles in the water conduit is discharged from the rim spout onto the bowl surface, the cleaning water will splash on the bowl surface and be scattered outside the bowl surface. There is a problem that there is a risk.
In particular, when cleaning water containing air bubbles flows near the front end of the bowl surface, where the radius of curvature of the bowl surface is relatively small, the flow of cleaning water is forced to change direction significantly from the front to the rear. There is a problem in that the scattering outside the bowl surface becomes noticeable.
Furthermore, when air bubbles are mixed in the cleaning water, there is a problem that abnormal noise may be generated.

Therefore, the present invention has been made to solve the above-mentioned problems and required problems of the conventional technology. The purpose is to provide toilet bowls.

In order to solve the above-mentioned problems, the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source and discharges filth, the toilet bowl having a toilet body and a rear part of the upper surface of the toilet bowl body as the flushing water source. The above-mentioned washing water tank is provided on the side and stores washing water, and includes a tank supply section forming a flow path including a drain port at the bottom thereof, and supplies washing water from the tank supply section to the above-mentioned toilet main body. a wash water tank; the toilet main body includes a bowl having a bowl-shaped dirt receiving surface and a rim formed on the upper edge of the dirt receiving surface; and a bowl formed at the rear of the bowl; a rear water conduit that guides the wash water supplied from the tank supply section to the rear of the bowl; a water spout section that is provided only on the rim and that spews wash water into the bowl to form a swirling flow; A rim conduit formed on the downstream side of the rear conduit and guiding wash water in the rear conduit to the water spout, and a drainage conduit connected below the bowl to discharge waste. The rear water conduit includes an inlet to which the tank supply section is connected, and a rectifier provided below the inlet to rectify the wash water supplied from the tank supply section through the inlet. and an inclined part formed on the downstream side of the rectifying part and sloping downward so as to communicate with the rim water conduit, and the rectifying part has a flow passage cross-sectional area that is equal to the flow path of the inclined part. It is characterized in that it is set to be smaller than the cross-sectional area, and the flow path is formed so as to be substantially horizontal.
In the present invention configured in this way, the flush water supplied from the tank supply section to the inlet of the rear side water channel of the toilet main body flows into the rectifier section of the rear side water channel. At this time, the rectifying part is set so that its flow passage cross-sectional area is smaller than the flow passage cross-sectional area of the inclined part, and the flow passage is formed so as to be almost horizontal. The flushing water that flows from the supply section into the rectifier through the inlet of the rear water conduit of the toilet main body spreads throughout the rectifier at once.
As a result, the entire volume space in the rectifier of the rear water conduit of the toilet body is occupied by the flushing water, so the flushing water in the flush water tank flows out from the drain port of the tank supply part and flows to the rear side of the toilet body. When being supplied into the waterway, it is possible to suppress the generation of air bubbles in the rectifying section of the rear side waterway.
Furthermore, on the downstream side of the rectifying section of the rear water conduit of the toilet main body, there is a sloped section that slopes downward toward the rim conduit. , the flow rate of the cleaning water can be increased when flowing through the slope.
Therefore, for example, even if a so-called low tank is used as a flush water tank, in which the highest internal water level is relatively low and the head pressure acting on the bottom of the flush water tank is low, the toilet body In the rear side water conduit, it is possible to suppress the inclusion of air bubbles, and the water force of the wash water (rim water spout) discharged from the water spouting portion from the rear side water conduit via the rim water conduit can be maintained.
As a result, it is possible to simultaneously suppress the inclusion of air bubbles in the rim water discharge and improve the water force.

In the present invention, preferably, the flow passage cross-sectional area of the rectifying portion of the rear side water conduit is set to be smaller than the flow passage cross-sectional area of the tank supply portion.
In the present invention configured as described above, since the flow passage cross-sectional area of the rectifying part of the rear side water conduit is set to be smaller than the flow passage cross-sectional area of the tank supply part, there is no flow from the flush water tank to the toilet main body. The cleaning water that has flowed into the rectifying section of the rear water conduit can be quickly filled with water.
Therefore, it is possible to suppress the inclusion of air bubbles in the flow straightening section of the rear water conduit of the toilet main body, and thus the flow straightening effect can be improved.

In the present invention, preferably, from the bottom surface of the rectifying section on the same vertical straight line with respect to the distance (H1) on the vertical straight line from the lowest position of the bottom of the inclined part of the rear side water conduit to the top surface of the rectifying section. The ratio (H2/H1) of the distance (H2) to the top surface is the distance from the bottom surface of the slope part on the same vertical straight line to the distance (H3) on the vertical straight line from the lowest position of the bottom face to the top surface in the slope part. It is set to be smaller than the ratio (H4/H3) of the vertical distance (H4) to the top surface.
In the present invention configured in this way, the height dimension within the flow path of the rectifying portion of the rear side water conduit of the toilet main body can be set smaller than the height dimension within the flow path of the inclined portion. It is possible to set the cross-sectional area of the flow path within the rectifying portion to be relatively small, while setting the cross-sectional area of the flow path within the slope portion to be relatively large.
In addition, since the part upstream of the downstream end of the rectifier can be set at a higher position than the inclined part, the mixing of air bubbles in the rectifier is suppressed and the potential energy of the cleaning water is maintained relatively high. As the water flows down the slope, a water force is applied.
Therefore, in the rectifying section and the inclined section of the rear water conduit of the toilet main body, it is possible to simultaneously suppress the mixture of air bubbles and provide water force.

In the present invention, preferably, the inclined part of the rear side water conduit is inclined downward from the inlet connected to the rectifying part toward the outlet connected to the rim water conduit, and the bottom surface of the inclined part The angle of inclination at which the upper surface of the inclined portion is inclined downward with respect to the horizontal plane is set to be larger than the angle of inclination at which the upper surface of the inclined portion is inclined downward with respect to the horizontal plane.
In the present invention configured as described above, by making the angle of inclination of the bottom surface of the inclined part of the rear side water conduit larger than the angle of inclination of the upper surface of the inclined part, the flow passage cross-sectional area of the inclined part is increased downstream. Can be set large.
Therefore, it is possible to suppress the pressure loss within the flow path of the inclined portion of the rear side water conduit, and therefore it is possible to impart sufficient water force to the wash water flowing within the inclined portion.

In the present invention, preferably, the water discharging section is disposed on the rim in a region forward of the center of the bowl in the front-rear direction to discharge water forward, and the rectifying section and the inclined section of the rear water conduit are preferably flat. When viewed, they are provided linearly in the front-rear direction.
In a general flush toilet configured as described above, which is different from the present invention, when the water spouting part is arranged on the rim located in the area forward of the center of the bowl in the front-rear direction, the water flowing from the water spouting part to the front. The discharged cleaning water flows into the vicinity of the front end of the bowl with a strong force, passes through the front end of the bowl, and is abruptly turned back toward the rear.
At this time, in particular, as the position of the water spout gets closer to the front end of the bowl, the path from the tank supply part to the water spout via the rear side water conduit and rim water conduit becomes longer, so air bubbles may occur in this path. In this case, the cleaning water containing air bubbles is spouted from the water spouting section and reaches the vicinity of the front end of the bowl.
Furthermore, in general, the longer the route from the tank supply section to the water discharge section via the rear side conduit and the rim conduit, the greater the pressure loss in that flow path, leading to a decrease in water force and the supply of cleaning water. This can lead to delays (or wasted water).
In contrast, in the present invention, since the straightening part and the inclined part of the rear headrace are provided linearly in the front-rear direction relative to each other in plan view, the flow path distance of at least the section of the rear headrace can be minimized. Can be set.
Therefore, even if the water spouting part is arranged on the rim in the front area of the bowl from the front-rear center, the path from the tank supply part to the water spouting part via the rear water conduit and the rim water conduit is set to be relatively short. Therefore, it is possible to suppress the inclusion of air bubbles and a decrease in water force within this path. Further, it is also possible to suppress supply delays (or wasted water) of cleaning water.

In the present invention, preferably, the rim water conduit is set such that a flow passage cross-sectional area of the inlet portion thereof is smaller than a flow passage cross-sectional area of the water discharge portion, and the bottom surface of the rim water conduit is It is formed so as to be inclined downward from the inlet of the waterway toward the water discharge section.
In the present invention configured in this way, the cross-sectional area of the inlet of the rim water conduit is set to be smaller than the cross-sectional area of the water discharge part, so that water can be removed from the slope of the rear water conduit. The cleaning water flowing into the rim water conduit is rectified by passing through the inlet portion of the rim water conduit, which has a flow passage cross-sectional area smaller than the flow passage cross-sectional area of the water discharge portion. The cleaning water in the rim water channel flows along the bottom surface of the rim water channel that slopes downward from the inlet of the rim water channel toward the water discharge part, thereby applying water force and increasing the flow velocity.
Therefore, water force can be applied to the wash water in the rim conduit on the downstream side of the rear conduit while suppressing the inclusion of air bubbles.

In the present invention, preferably, the water spouting part is disposed on the rim on one side and the front side in the left-right direction with respect to the center of the bowl in the front-back direction and the left-right direction, and the water spouting part is preferably disposed on the rim on the front side and on one side in the left-right direction with respect to the center of the bowl in the front-rear direction and the left-right direction a first rim water spouting part configured to spout water to form a swirling flow; a second rim water spouting section that forms a swirling flow in the same direction as the swirling flow from the first rim water spouting section; A first rim water conduit and a second rim water conduit leading to each of the rim water spouts are provided, and the flow passage cross-sectional area of the rectifying part is equal to the flow passage cross-sectional area of the first rim water spout and the second rim water spout. It is set to be smaller than the sum of the cross-sectional area of the flow path.
In the present invention configured in this way, the flow passage cross-sectional area of the rectifying part of the rear side water conduit of the toilet main body is equal to the flow passage cross-sectional area of the first rim water spouting part and the flow passage cross-sectional area of the second rim water spouting part. Since the cleaning water is set to be smaller than the sum of The water is supplied to each of the first rim water spouting section and the second rim water spouting section through the first rim water conduit and the second rim water conduit.
Therefore, the cleaning water in a state where air bubbles are suppressed and water force is applied can be spouted from each of the first rim water spouting section and the second rim water spouting section.

According to the flush toilet of the present invention, it is possible to achieve both suppression of air bubbles in the rim water discharge and improvement of water force.

FIG. 1 is a schematic plan view of a flush toilet according to an embodiment of the present invention. 2 is a sectional view taken along line II-II in FIG. 1. FIG. 2 is a sectional view taken along line III-III in FIG. 1. FIG. FIG. 3 is a partial enlarged view of the rear water conduit of the toilet main body in the flush toilet according to the embodiment of the present invention shown in FIG. 2; FIG. 3 is a partial enlarged view of the inner peripheral surface of the rim of the toilet main body in the flush toilet according to the embodiment of the present invention shown in FIG. 2; FIG. 2 is a diagram showing flow passage cross sections A to H in the flush toilet according to the embodiment of the present invention shown in FIG. 1;

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 6.
First, FIG. 1 is a schematic plan view of a flush toilet according to an embodiment of the present invention. 2 is a sectional view taken along line II-II in FIG. 1, and FIG. 3 is a sectional view taken along line III-III in FIG.
As shown in FIGS. 1 to 3, a flush toilet 1 according to an embodiment of the present invention includes a toilet main body 2 made of ceramic. The toilet main body 2 includes, from the upstream side to the downstream side, a rear side waterway 4 (details will be described later), a first rim waterway 6, a second rim waterway 8, a bowl 10, and a drain trap pipe. 12 each.
Note that the toilet bowl main body 2 may be made of resin or the like other than ceramic.

Next, a toilet seat (not shown), a toilet lid (not shown), etc. are provided on the top surface of the toilet main body 2 of the flush toilet 1 of the present embodiment shown in FIG. Since the structure is similar to that of a toilet bowl, a detailed explanation will be omitted.
In addition, on the upper surface of the toilet main body 2, on the rear side of the toilet seat (not shown) and toilet lid (not shown), there is a sanitary washing section (not shown) for washing the user's private parts and a toilet main body 2. A functional unit (not shown) such as a water supply system function unit that is involved in the water supply function of the toilet may also be provided, but since these are similar in structure to the conventional flush toilet, detailed explanations will be provided. is omitted.

Next, as shown in FIGS. 1 to 3, the flush toilet 1 according to an embodiment of the present invention has a flush water tank device 14, which is a flush water source, provided behind and above the bowl 10 of the toilet body 2. We are prepared.
This flushing water tank device 14 serves as a flushing water tank that stores flushing water, and is a so-called gravity-fed type of water storage in which the stored flushing water can be supplied to the rear water conduit 4 of the toilet main body 2 using gravity. It is equipped with a tank 16. A drain port 16a is formed on the bottom surface of the water storage tank 16 as a tank supply section for supplying cleaning water, and a tank supply path 16b is formed downward from the drain port 16a. .
Note that inside the water storage tank 16, there is typically a water supply device (not shown) that supplies washing water into the water storage tank 16, and a drain valve device (not shown) that opens and closes the drain port 16a of the water storage tank 16. However, since these devices are the same as conventional ones, detailed explanations will be omitted.
Furthermore, in this embodiment, for example, a so-called low tank is used as the water storage tank 16, in which the highest water level in the water storage tank 16 is relatively low and the head pressure acting on the bottom surface of the water storage tank 16 is low. When cleaning the toilet bowl, for example, an amount of cleaning water of approximately 3.6 [L] to approximately 4.8 [L] can be supplied from the water storage tank 16 to the toilet bowl main body 2.

Next, in the flush toilet 1 according to the embodiment of the present invention shown in FIG. The axis is indicated by "X", and the central axis extending in the horizontal front-rear direction so as to bisect the bowl 10 in the left-right direction is indicated by "Y".
In FIG. 1, the intersection of the central axes X and Y is the center O of the bowl 10 in a plan view, and the central axis extending vertically through the center O is indicated by "Z".
As a result, in the flush toilet 1 according to the embodiment of the present invention shown in FIGS. 2 and 3, when viewed from the side of the bowl 10 of the toilet main body 2, the bowl 10 is vertically divided into two in the front-rear direction. The central axis along which it extends is indicated by "Z".
Furthermore, as shown in FIGS. 1 to 3, the front, back, left, and right directions of the flush toilet 1 are indicated by "front,""rear,""left," and "right," respectively.
As shown in FIGS. 1 to 3, with respect to the center O of the bowl 10 of the flush toilet 1, the center axis X extending in the horizontal left-right direction, and the center axis Z extending in the vertical direction, the front side and the rear side The respective regions are defined as "front region F" and "rear region B".
Furthermore, as shown in FIG. 1, with respect to the center O of the bowl 10 of the flush toilet 1 and the central axis Y extending in the horizontal front-rear direction, "left side area L" is defined for each area on the left side and right side when viewed from the front. , "right side region R", respectively.

First, as shown in FIGS. 1 to 3, the rear water conduit 4 located on the upstream side of the toilet main body 2 is located forward from an inlet 4a provided on the rear side of the upper surface of the toilet main body 2, although details will be described later. It extends to the vicinity of the back side of the bowl 10 and is formed on the rear side of the bowl 10.
Further, the lower end outlet (downstream end) of the tank supply channel 16b of the water storage tank 16 is connected to the inlet 4a of the rear water conduit 4.

Next, as shown in FIGS. 1 and 2, the first rim water conduit 6 is connected from the outlet (downstream end) of the front end of the rear side water conduit 4 near the back side of the bowl 10 to one side of the bowl 10 (see FIG. After branching to the left side as seen from the front of the bowl 10 shown in FIG. It extends forward so as to bypass the outer circumferential surface.
Further, the front end (downstream end) of the first rim conduit 6 is connected to a first rim provided as a first rim water spouting portion on the rim 18 in the front side area F and left side area L of the bowl 10, as shown in FIG. It has a spout 20.
Here, as shown in FIG. 1, regarding the bowl surface S of the front side area F of the bowl 10 where the first rim spout 20 is arranged, the radius of curvature in plan view is the minimum ( curvature is maximum).
Furthermore, as shown in FIG. 1, the position of the first rim spout 20 of the toilet main body 2 in the front-rear direction is determined by the inner circumferential surface 18a of the rim 18 of the bowl 10 in the plan view of FIG. 1 and the side view of FIG. It is located in the front region F and the left region L of the bowl 10, which is behind the front end 18b of the bowl 10 and in front of the front end 24a of the front wall surface of the recess 24.
For example, the distance Y1 in the front-rear direction from the front end 10a in the bowl 10 (the front end 18b of the inner peripheral surface 18a of the rim 18) to the first rim spout 20, and the distance Y2 from the front end 10a in the bowl 10 to the rear end 10b. The ratio (Y1/Y2) is set to be 15% to 35% (Y1/Y2=15% to 35%).
The first rim water spout 20 may be provided as a first rim water spout on the rim 18 in the front region F and right region R of the bowl 10.

Furthermore, as shown in FIGS. 1 and 3, the second rim water conduit 8 extends from the outlet (downstream end) of the front end of the rear side water conduit 4 near the back side of the bowl 10 to the other side of the bowl 10 (as shown in FIG. After branching to the right side as seen from the front of the bowl 10 shown in FIG. It extends forward to bypass the surface.
Thereafter, the second rim water conduit 8 is formed so as to make a U-turn toward the rear near the right side of the bowl 10, as shown in FIG. As shown in FIG. 1, the rear end, which is the downstream end, of the second rim water conduit 8 is connected to a second rim water spout provided on the rim 18 in the rear region B and right region R of the bowl 10. It has a two-rim spout 22.
That is, the position of the second rim spout 22 of the toilet main body 2 in the front-rear direction is located behind the central axis X of the bowl 10 in the horizontal left-right direction and in the recess 24 in the plan view of FIG. 1 and the side view of FIG. It is located in the rear region B and right region R of the bowl 10, ahead of the rear end 24b of the rear wall surface.

Next, as shown in FIGS. 1 to 3, the bowl 10 of the toilet main body 2 is provided with a recess 24, a dirt receiving surface 26, a shelf 28, and a rim 18 from the bottom to the top.
First, the recessed portion 24 of the bowl 10 is formed in a concave shape below the bowl 10, and serves as a water storage portion in which the stored water W0 is accommodated.
Next, the dirt receiving surface 26 of the bowl 10 is formed into a bowl shape from the upper edge of the recess 24, and serves as a surface for receiving dirt.
Further, the shelf 28 of the bowl 10 is formed between the outer edge of the dirt receiving surface 26 and the lower end of the rim 18. The flushing water in the rear side conduit 4 of the toilet main body 2 passes through the first rim conduit 6 and second rim conduit 8 on the downstream side to the first rim spout 20 and second rim spout 22, respectively. It is meant to be guided.
The cleaning water spouted from each of the first rim spout 20 and the second rim spout 22 is guided downstream in the circumferential direction along the shelf 28 so as to form a swirling flow in the same direction. It has become.
In addition, in the flush toilet 1 of this embodiment, no water spouting portion (for example, a jet spout, etc.) is provided at a location other than the rim 18, and the first rim water spout 20 is provided only on the rim 18. Although a mode in which only rim water is spouted from two water spouts of the second rim water spout 22 will be described, the second rim water spout 22 may be omitted.

Next, as shown in FIGS. 1 to 3, a drain trap pipe 12 located on the downstream side of the toilet main body 2 is formed rearward from below the concave portion 24 of the bowl 10, and is configured to drain waste from the bowl 10. It is a drainage channel.
Further, the flush toilet 1 of the present embodiment is a so-called "flush-out type flush toilet" in which filth is washed away into the drain trap pipe 12 by the flowing action of the water drop in the bowl 10 of the toilet main body 2. .
However, in the flush toilet 1 of the present embodiment, a so-called "siphon-type flush toilet" that uses siphon action to suck in the waste in the bowl and discharge it to the outside from the drain trap pipe at once, etc. It can also be applied to flush toilets in forms other than drop-in type flush toilets.

Next, with reference to FIGS. 1 to 6, the first rim spout of the rear water conduit 4 in the toilet main body 2 of the flush toilet 1 of the present embodiment and the first rim water conduit 6 downstream thereof The details of the flow paths up to 20 will be explained.
First, FIG. 4 is a partially enlarged view of the rear water conduit of the toilet main body in the flush toilet according to the embodiment of the present invention shown in FIG. Moreover, FIG. 5 is a partially enlarged view of the inner peripheral surface of the rim of the toilet main body in the flush toilet according to the embodiment of the present invention shown in FIG. Further, FIG. 6 is a diagram showing each flow passage cross section A to H in the flush toilet according to one embodiment of the present invention shown in FIG.
Here, in FIGS. 4 and 6, the cross-sectional area [mm ² ] of the flow path from the tank supply path 16b on the upstream side of the rear side water conduit 4 to each rim spout 20, 22 on the downstream side is A1 - Shown as A9.

As shown in FIG. 4, the rear water conduit 4 includes an inlet 4a, a rectifying section 30, and an inclined section 32 from the upstream side to the downstream side.
First, as shown in FIGS. 1 and 4, the inlet 4a of the rear water conduit 4 opens upward at a position on the rear side of the upper surface of the toilet main body 2, and the inlet 4a is connected to a water storage tank. The lower end outlets (downstream ends) of the 16 tank supply paths 16b are watertightly connected from above via a seal member (not shown) or the like.
Next, as shown in FIGS. 1 and 4, the rectifying section 30 of the rear headrace 4 is formed below the rear headrace 4 and then extends forward almost horizontally. There is. The cleaning water supplied from the tank supply path 16b through the inlet 4a of the rear water conduit 4 flows into the rectifier 30 and then flows forward in the rectifier 30, so that the water is rectified. It has become.
Further, as shown in FIGS. 1 and 4, the inclined portion 32 of the rear water conduit 4 is formed on the downstream side of the flow straightening section 30 (in front and below the flow straightening section 30). This inclined portion 32 is inclined downward from the rear toward the front so that its front end communicates with the inlet 6a of the first rim water conduit 6.

Next, as shown in FIGS. 4 and 6, regarding the flow passage cross-sectional areas A1 and A2 of the tank supply passage 16b and the rectifying part 30 of the rear side headrace 4, respectively, The flow passage cross-sectional area A2 is set to be smaller than the flow passage cross-sectional area A1 of the tank supply passage 16b.

Next, as shown in FIG. 4, in the rear water conduit 4, the distance on a vertical straight line from the lowest height position P0 of the bottom surface 32a of the inclined part 32 to the height position P1 of the upper surface 30a of the rectifying part 30. is defined as H1 [mm], and the distance from the height position P2 of the bottom surface 30b to the position P1 of the top surface 30a in the rectifying section 30 on the same vertical straight line is defined as H2 [mm].
Further, as shown in FIGS. 4 and 6, the distance on the vertical straight line from the lowest height position P0 of the bottom surface 32a of the sloped part 32 to the height position P3 of the top surface 32b is defined as H3 [mm], and the sloped part 32 Let H4 [mm] be the vertical distance from the height position P4 of the bottom surface 32a to the height position P3 of the top surface 32b.
As a result, as shown in FIG. 4, in the flow path in the rectifying section 30 and the inclined section 32 of the rear side water conduit 4, the ratio of the distance H2 to the distance H1 (H2/H1) is the ratio of the distance H4 to the distance H3. It is set to be smaller than the ratio (H4/H3) ((H2/H1)<(H4/H3)).
Therefore, as shown in FIG. The height dimension H4 in the flow path on the downstream side of the outlet 30 is set smaller than the height dimension H4 (H2<H4).

Furthermore, as shown in FIGS. 1 and 6, the flow channels of the rectifying section 30 and the inclined section 32 of the rear side water conduit 4 are provided linearly in the front-rear direction relative to each other in plan view, and The maximum width dimension in the left and right direction of each of the rectifying section 30 and the inclined section 32 of the water channel 4 is set to the same width dimension W1.
Therefore, as shown in FIGS. 4 and 6, the flow path cross-sectional area A2 of the flow straightening section 30 formed by the width dimension W1 and the height dimension H2 in the flow channel of the flow straightening section 30 of these rear side water conduits 4 is set to be smaller than the channel cross-sectional area A3 of the inclined section 32 formed by the width dimension W1 and the height dimension H4 in the channel of the inclined section 32 (A2<A3).

Next, as shown in FIG. 4, the inclined part 32 of the rear side water conduit 4 is directed from the rear inlet 32c connected to the rectifying part 30 toward the outlet 32d connected to the inlet 6a of the first rim water conduit 6. It is tilted downward.
Further, an inclination angle α at which the bottom surface 32a of the inclined portion 32 is inclined downward with respect to the horizontal plane is set to be larger than an inclination angle β at which the upper surface 32b of the inclined portion 32 is inclined downward with respect to the horizontal plane. (α>β).
As a result, the flow passage cross-sectional area A3 of the inclined portion 32 is set to become larger toward the downstream side.

Next, as shown in FIGS. 1 and 4 to 6, the flow passage cross-sectional area A4 (see FIGS. 4 and 6) near the entrance 6a of the first rim water conduit 6 (section C in FIG. 1) is It is set to be smaller than the flow passage cross-sectional area A8 (see FIG. 6) of the one-rim spout 20.
Further, as shown in FIGS. 1, 5, and 6, the bottom surface 6b of the first rim water conduit 6 formed on the outside of the inner circumferential surface 18a of the rim 18 extends from the inlet 6a of the first rim water conduit 6. It is formed to be inclined downward toward the 1-rim spout 20.
Further, as shown in FIG. 6, the cross-sectional areas A4 to A8 of the first rim conduit 6 from the inlet 6a to the first rim spout 20 are set to become larger toward the downstream side (A4 <A5<A6<A7<A8).
On the other hand, as for the second rim water conduit 8, similarly to the first rim water conduit 6, as shown in FIG. It is formed so as to be inclined downward toward the downstream side toward the rim spout 22. Further, the cross-sectional area of the second rim conduit 8 from the inlet 8a to the second rim spout 22 is also set to increase toward the downstream side.

Next, as shown in FIG. 6, the flow passage cross-sectional area A2 of the flow straightening section 30 of the rear side water conduit 4 is equal to the flow passage cross-sectional area A8 of the first rim spout 20 and the flow passage cross-section of the second rim spout 22. It is set to be smaller than the sum of area A9 (A8+A9) (A2<A8+A9).

Next, the operation of the flush toilet 1 according to an embodiment of the present invention will be explained with reference to FIGS. 1 to 6.
According to the above-described flush toilet 1 according to the embodiment of the present invention, as shown in FIGS. 1 and 4, flush water is supplied from the tank supply path 16b to the inlet 4a of the rear water conduit 4 of the toilet main body 2. W flows into the rectifying section 30 of the rear water conduit 4.
At this time, as shown in FIG. 4, the flow path cross-sectional area A2 of the rectifier section 30 is set to be smaller than the flow path cross-sectional area A3 of the slope section 32 (A2<A3), and the rectifier The flow path within the portion 30 is formed to be approximately horizontal. Therefore, the flushing water that flows into the rectifier 30 from the tank supply path 16b through the inlet 4a of the rear water conduit 4 of the toilet main body 2 spreads throughout the rectifier 30 at once.
As a result, the entire volume space in the rectifying section 30 of the rear water conduit 4 of the toilet main body 2 is occupied by the flushing water, so that the flushing water in the water storage tank 16 flows out from the drain port 16a and from the tank supply channel 16b. When the water is supplied into the rear water conduit 4 of the toilet main body 2, it is possible to suppress the generation of air bubbles within the rectifier 30 of the rear water conduit 4.
Further, on the downstream side of the rectifying section 30 of the rear side conduit 4 of the toilet main body 2, an inclined section 32 that is inclined downward toward the first rim conduit 6 is formed. The washing water that has flowed into the inclined part 32 can increase the flow rate of the washing water when flowing through the inclined part 32.
Therefore, for example, when a so-called low tank is used as the water storage tank 16 of the wash water tank device 14, in which the maximum water level inside the tank is relatively low and the head pressure acting on the bottom surface of the wash water tank is low. Even if there is, it is possible to suppress the mixing of air bubbles in the rear side water conduit 4 of the toilet main body 2, and the first The water force of the cleaning water (rim water spout) discharged from each of the rim spout 20 and the second rim spout 22 can be maintained.
As a result, it is possible to simultaneously suppress the mixture of air bubbles and improve the water force in the rim water discharged from each of the first rim water spout 20 and the second rim water spout 22.

Next, according to the flush toilet 1 according to the present embodiment, as shown in FIGS. 4 and 6, the flow passage cross-sectional area A2 of the rectifying portion 30 of the rear side water conduit 4 of the toilet main body 2 is larger than that of the tank supply passage 16b. It is set to be smaller than the flow path cross-sectional area A1. Thereby, the flushing water W flowing from the water storage tank 16 into the rectifying section 30 of the rear water conduit 4 of the toilet main body 2 can be quickly filled with water.
Therefore, since it is possible to suppress the inclusion of air bubbles in the rectifying section 30 of the rear water conduit 4 of the toilet main body 2, the rectifying effect can be improved.

Further, according to the flush toilet 1 according to the present embodiment, as shown in FIG. From the height position P2 of the bottom surface 30b of the rectifying section 30 on the same vertical straight line to the position P1 of the top surface 30a on the same vertical straight line with respect to the distance H1 on the vertical straight line from the position P0 to the height position P1 of the top surface 30a of the rectifying section 30 The ratio (H2/H1) of the distance H2 of the bottom surface 32a of the sloped portion 32 is the distance H3 on the vertical straight line from the lowest height position P0 of the bottom surface 32a of the sloped portion 32 to the height position P3 of the top surface 32b. The distance H4 in the vertical direction from the height position P4 to the height position P3 of the upper surface 32b is set to be smaller than the ratio (H4/H3) ((H2/H1)<(H4/H3)).
Therefore, as shown in FIG. 4, the height H2 in the flow path of the rectifying section 30 of the rear water conduit 4 of the toilet main body 2 is set smaller than the height H4 in the flow path of the inclined part 32. Therefore, it is possible to set the channel cross-sectional area A3 in the inclined portion 32 to be relatively large while setting the channel cross-sectional area A2 in the rectifying portion 30 to be relatively small.
Furthermore, as shown in FIG. 4, since the portion of the flow straightening section 30 upstream of the downstream end can be set at a higher position than the inclined section 32, the incorporation of air bubbles within the flow straightening section 30 is suppressed. When the cleaning water whose potential energy is maintained relatively high flows through the inclined portion 32, a water force is applied.
Therefore, in the rectifying portion 30 and the inclined portion 32 of the rear water conduit 4 of the toilet main body 2, it is possible to suppress the mixture of air bubbles and provide water force.

Furthermore, according to the flush toilet 1 of this embodiment, as shown in FIG. By making the angle β larger than the angle β, the flow passage cross-sectional area A3 of the inclined portion 32 can be set to be larger toward the downstream side.
Therefore, pressure loss within the flow path of the inclined portion 32 of the rear water conduit 4 can be suppressed, so that sufficient water force can be applied to the wash water flowing within the inclined portion 32.

Further, in a general flush toilet other than the flush toilet 1 according to the present embodiment, when the water spouting part of the toilet main body is arranged on the rim located in the front region of the bowl in the front-rear direction, The cleaning water spouted forward from the water spouting portion flows into the vicinity of the front end of the bowl with a strong force, passes through the front end of the bowl, and is abruptly turned back toward the rear.
At this time, in particular, as the position of the water spout gets closer to the front end of the bowl, the path from the tank supply channel 16b to the water spout via the rear side water conduit and rim water conduit becomes longer, so air bubbles are generated in this path. In this case, the cleaning water containing air bubbles will be spouted from the water spouting portion and will reach the vicinity of the front end of the bowl.
Furthermore, in a general flush toilet other than the flush toilet 1 according to the present embodiment, the longer the path from the tank supply path 16b to the water outlet via the rear side water flow channel and the rim water flow channel, the more the inside of the flow channel increases. The pressure loss increases, which causes a decrease in water force and a delay in the supply of cleaning water (or wasted water).
On the other hand, in the flush toilet 1 according to the present embodiment, as shown in FIG. Since it is provided, the flow path distance in the front-rear direction of at least the section of the rear water conduit 4 can be set to be the shortest.
Therefore, even if the first rim spout 20 is disposed on the rim 18 in the area F forward of the center O of the bowl 10 in the front-rear direction, the tank supply path 16b is connected to the rear side water conduit 4 and the first rim water conduit 6. Since the path from the water outlet to the first rim spout 20 can be set relatively short, it is possible to suppress the inclusion of air bubbles and a decrease in water force in this path. Further, it is also possible to suppress supply delays (or wasted water) of cleaning water.
be able to.

Furthermore, according to the flush toilet 1 according to the present embodiment, as shown in FIGS. 1 and 4 to 6, the flow passage cross-sectional area A4 of the inlet 6a of the first rim water conduit 6 is larger than that of the first rim water spout 20. It is set to be smaller than the flow path cross-sectional area A8.
Further, as shown in FIGS. 1, 5, and 6, the bottom surface 6b of the first rim water conduit 6 formed on the outside of the inner circumferential surface 18a of the rim 18 extends from the inlet 6a of the first rim water conduit 6. It is formed to be inclined downward toward the 1-rim spout 20.
Further, as shown in FIG. 6, the cross-sectional areas A4 to A8 of the first rim conduit 6 from the inlet 6a to the first rim spout 20 are set to become larger toward the downstream side (A4 <A5<A6<A7<A8).
Due to these, the cleaning water flowing into the first rim water conduit 6 from the inclined part 32 of the rear side water conduit 4 flows into the first rim water conduit 6, which has a flow passage cross-sectional area A4 smaller than the flow passage cross-sectional area A8 of the first rim water spout 20. The flow is rectified by passing through the inlet 6a of the water conduit 6. The cleaning water in the first rim conduit 6 flows along the bottom surface of the rim conduit that slopes downward from the inlet 6a of the first rim conduit 6 toward the first rim water spout 20, so that the water pressure increases. is applied and the flow rate increases.
Therefore, even in the wash water in the first rim conduit 6 on the downstream side of the rear side conduit 4, water force can be applied while suppressing the inclusion of air bubbles.
Similarly, regarding the second rim water conduit 8, as shown in FIG. It is formed to slope downward. Further, the cross-sectional area of the second rim conduit 8 from the inlet 8a to the second rim spout 22 is also set to increase toward the downstream side.
Therefore, even in the wash water in the second rim conduit 8 on the downstream side of the rear side conduit 4, water force can be applied while suppressing the inclusion of air bubbles.

Further, according to the flush toilet 1 according to the present embodiment, as shown in FIG. It is set to be smaller than the sum of the passage cross-sectional area A8 and the flow passage cross-sectional area A9 of the second rim spout 22 (A8+A9) (A2<A8+A9).
As a result, as shown in FIG. 4, the cleaning water W supplied from the tank supply path 16b into the rear water conduit 4 is sufficiently rectified in the rectifier 30, and water force is applied in the inclined portion 32. After that, it is supplied to the first rim water spout 20 and the second rim water spout 22, respectively, through the first rim water conduit 6 and the second rim water conduit 8, respectively.
Therefore, the cleaning water can be spouted from each of the first rim spout 6 and the second rim spout 22 in a state where bubbles are suppressed and the water force is applied.

1 Flush toilet 2 Toilet body 4 Rear headrace 4a Inlet of rear headrace (entrance of rear headrace)
6 First rim headrace 6a Entrance of the first rim headrace (inlet of rim headrace)
6b Bottom of the first rim headrace (inlet of the rim headrace)
8 Second rim headrace 8a Entrance of the second rim headrace (inlet of the rim headrace)
8b Bottom of the second rim headrace (inlet of the rim headrace)
10 Bowl 10a Front end inside the bowl 10b Rear end inside the bowl 12 Drainage trap pipe (drainage path)
14 Washing water tank device (washing water source, washing water tank)
16 Water storage tank (washing water source, washing water tank)
16a Drain port (tank supply part)
16b Tank supply path (tank supply section)
18 Rim 18a Inner peripheral surface of the rim 18b Front end of the inner peripheral surface of the rim 20 First rim spout (water spouting part, first rim spouting part)
22 Second rim spout (water spout, second rim spout)
24 Recess 24a Front end of the front wall of the recess 24b Rear end of the rear wall of the recess 26 Dirt receiving surface 28 Shelf 30 Rectifying section of the rear headrace 30a Top surface of the flow straightener 30b Bottom surface of the rectifier 32 Inclined section of the rear headrace 32a Bottom surface of the slope 32b Top surface of the slope 32c Inlet of the slope 32d Outlet of the slope A1 Cross-sectional area of the flow path at section A of the tank supply channel A2 Cross-sectional area of the flow path of cross-section B of the rectifying section of the rear rim water conduit A3 Channel cross-sectional area of the slope of the rear rim headrace A4 Channel cross-sectional area near the entrance of the first rim headrace (cross section C) A5 Channel cross-sectional area of the D cross-section of the first rim headrace A6 First rim headrace Flow passage cross-sectional area of E cross-section of the water channel A7 Flow passage cross-sectional area of F cross-section of the first rim headrace A8 Flow passage cross-sectional area of G cross-section of the first rim headrace A8 First rim spout of the first rim headrace ( B Rear area of the bowl L Left area of the bowl F Front area of the bowl H1 Height position from the lowest height of the bottom of the slope of the rear rim conduit to the top of the rectifier H2 Distance and height dimension from the height position of the bottom surface to the position of the top surface in the rectifying part of the rear rim headrace channel H3 The minimum height position of the bottom face in the sloped part of the rear rim headrace channel to the height of the top surface H4 Vertical distance and height dimension from the height of the bottom surface to the height of the top surface of the sloped part of the rear rim headrace O Center of the bowl P0 The height of the slope of the rear rim headrace Minimum height position of the bottom surface P1 Height position of the top surface of the rectifying part of the rear side headrace P2 Height position of the bottom surface of the rectifier part of the rear side headrace P3 Height position of the top surface of the slope part of the rear side headrace P4 Rear Height position of the bottom surface of the inclined part of the side water channel R Right area of the bowl S Bowl surface W Washing water W0 Retained water W1 Maximum horizontal width dimension of the rectifying part and the inclined part of the rear water channel X Horizontal left and right direction of the bowl Y Central axis of the bowl in the horizontal longitudinal direction Y1 Distance in the longitudinal direction from the front end of the bowl to the first rim spout Y2 Distance from the front end to the rear end of the bowl Z Vertical center passing through the center of the bowl Axis α Angle of inclination of the bottom of the rear headrace with respect to the horizontal plane β Angle of inclination of the top of the rear headrace with respect to the horizontal plane

Claims (8)

A flush toilet that is flushed and discharges waste with flush water supplied from a flush water source,
The toilet bowl body,
A wash water tank is provided as the wash water source on the rear side of the upper surface of the toilet main body and stores wash water, and includes a tank supply section forming a flow path including a drain port on the bottom of the tank supply section. the above-mentioned wash water tank that supplies wash water to the above-mentioned toilet main body,
The toilet main body includes a bowl including a bowl-shaped dirt receiving surface and a rim formed on the upper edge of the dirt receiving surface;
a rear water conduit formed at the rear of the bowl and guiding the wash water supplied from the tank supply section to the rear of the bowl;
a water spouting section provided only on the rim and spouting cleaning water into the bowl to form a swirling flow;
a rim conduit that is formed downstream of the rear conduit and guides wash water in the rear conduit to the water discharge section;
It is equipped with a drainage channel connected to the lower part of the bowl to discharge waste,
The rear water conduit includes an inlet to which the tank supply section is connected, and a rectifier that is provided below the inlet and rectifies the wash water supplied from the tank supply section through the inlet. , an inclined part formed on the downstream side of the rectifying part and inclined downward so as to communicate with the rim water conduit,
The rectifying section is set so that its flow passage cross-sectional area is smaller than the flow passage cross-sectional area of the inclined part, and the flow passage is formed so as to be substantially horizontal;
The rim water conduit is set such that the cross-sectional area of the inlet portion thereof is smaller than the cross-sectional area of the water discharge portion;
A flush toilet characterized in that the maximum width dimension in the left-right direction of each of the rectifying section and the inclined section is set to be the same width dimension . 2. The flush toilet according to claim 1, wherein a flow passage cross-sectional area of the rectifying portion of the rear side water conduit is set to be smaller than a flow passage cross-sectional area of the tank supply portion. The distance from the bottom surface to the top surface of the rectifying section on the same vertical straight line (H2) with respect to the distance (H1) on the vertical straight line from the lowest position of the bottom surface of the inclined part of the rear water conduit to the top surface of the rectifying section The ratio (H2/H1) is the distance in the vertical direction from the bottom surface to the top surface of the slope part on the same vertical line to the distance (H3) on the vertical straight line from the lowest position of the bottom surface to the top surface of the slope part. The flush toilet according to claim 2, wherein the ratio (H4) is set to be smaller than the ratio (H4/H3). The inclined part of the rear side water conduit is inclined downward from the inlet connected to the rectifying part toward the outlet connected to the rim water conduit, and the bottom surface of the inclined part is downward with respect to the horizontal plane. The flush toilet according to any one of claims 1 to 3, wherein the angle of inclination is set to be larger than the angle of inclination at which the upper surface of the inclined part is inclined downward with respect to a horizontal plane. The water spouting part is disposed on the rim in a region forward of the center of the bowl in the front-rear direction, and discharges water forward, and the rectifying part and the inclined part of the rear water conduit are linear with each other in the front-rear direction in a plan view. The flush toilet according to any one of claims 1 to 4, which is provided in a shape. The flush toilet according to any one of claims 1 to 5, wherein the bottom surface of the rim water conduit is formed to slope downward from the inlet of the rim water conduit toward the water discharge part. 7. The flush toilet according to claim 1, wherein the water spouting section includes a first rim water spouting section and a second rim water spouting section provided only on the rim. The first rim water spouting section is disposed on the rim on one side and front side in the left-right direction with respect to the center of the bowl in the front-rear direction and the left-right direction, and is configured to spout cleaning water toward the front of the bowl. The second rim water discharging portion is configured to form a swirling flow, and the second rim water discharging portion is disposed on the rim on the other side in the left-right direction and on the rear side with respect to the center of the bowl in the front-rear direction and the left-right direction, and It is configured to form a swirling flow in the same direction as the swirling flow from the rim water discharge part,
The rim conduit includes a first rim conduit and a second rim conduit that guide the wash water in the rear side conduit to the first rim water spout and the second rim water spout, respectively,
8. The cross-sectional area of the flow path of the rectifier is set to be smaller than the sum of the cross-sectional area of the first rim water spout and the cross-sectional area of the second rim water spout. flush toilet.

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