JP7830872B2 - flush toilet - Google Patents

Description

This invention relates to a flush toilet, and more particularly to a flush toilet that uses flushing water to wash away waste.

Conventionally, as a flush toilet that washes away waste with flushing water, there is a known type, for example, as described in Patent Document 1, which has a drain trap connected to the bottom of the bowl portion of the toilet body to discharge waste from the bowl portion.
This drain trap section comprises a bent section that descends backward and downward from an inlet connected to the bowl section, and then extends to rise backward and upward, an inclined section that slopes backward and downward from the downstream end of the bent section, and a hanging section that extends downward from the lower end of the inclined section.
As a result, the flushing water and waste from the bowl of the toilet bowl are discharged from the inlet of the drain trap into the bent section of the drain trap. After that, the waste that has passed through the bent section of the drain trap along with the flushing water passes through the inclined section of the drain trap downstream and is then discharged to the outside from the hanging section of the drain trap.
Furthermore, in the conventional flush toilet described in Patent Document 1 mentioned above, the inclined portion of the drain trap is joined to the upper front end of the hanging portion after it slopes downward from the upper rear end of the bent portion toward the rear. As a result, the flushing water that flows down along the inclined portion mainly flows in from the front side of the hanging portion.
Furthermore, a flow path is formed in the area behind the hanging portion within the drain trap section, and also above the hanging portion. This structure allows the cleaning water that flows into this flow path to also flow in from the rear side of the hanging portion.

Japanese Patent Publication No. 2020-180470

However, in the conventional flush toilet described in Patent Document 1 above, the flushing water has difficulty circulating to the walls and other surfaces within the flow path behind the hanging portion and above the hanging portion within the drain trap section, particularly behind and above the water level.
This presents a problem in that, on the wall surface of the flow path behind and above the hanging portion, there is a risk that attached waste may be left behind, or even that blockage of waste may occur.
Furthermore, if waste accumulates in the sloping or hanging sections of the drain trap without being completely discharged, an unpleasant odor may be generated within the drain trap, and this odor may backflow into the bowl section when flushing the toilet.
Therefore, a pressing issue in recent years is how to smoothly guide the cleaning water containing waste that flows from the bend in the drain trap section into the inclined section, and how to prevent clogging by waste.

Therefore, this invention was made to solve the problems of the prior art described above and the issues that have been requested in recent years. Its purpose is to provide a flush toilet that can smoothly guide the flushing water containing waste, which flows from the bent section of the drain trap into the inclined section, to the downward-facing section, thereby suppressing clogging of waste.

To solve the above-mentioned problems, the present invention provides a flush toilet that washes away waste with flushing water, comprising a bowl-shaped bowl section and a drain trap section having an inlet connected to the lower part of the bowl section for discharging waste from the bowl section, wherein the drain trap section has a bent section that descends backward and downward from its inlet and then extends to rise backward and upward, a forward inclined section that slopes backward and downward from the downstream end of the bent section, and a section provided to face the rearward side of the forward inclined section The structure comprises a rearward-sloping section, hanging sections that hang down downstream of the front-sloping section and the rearward-sloping section, a first joint that connects the front-sloping section and the hanging section by a first curved surface, and a second joint that connects the rearward-sloping section and the hanging section by a second curved surface. The entire vertical portion of the second joint, from its lower end to its upper end, is located within the range of the vertical height positions from the lower end to the upper end of the first joint, and the upper end of the first joint is set higher than the upper end of the second joint.
In the present invention configured as described above, the cleaning water and waste in the bowl section are discharged from the inlet of the drain trap section into the bent section of the drain trap section. Subsequently, the waste that has passed through the bent section of the drain trap section together with the cleaning water passes through the forward and rearward inclined sections of the drain trap section downstream thereafter, and is then discharged to the outside from the hanging section of the drain trap section.
Furthermore, when the washing water and waste that have passed through the bend in the drain trap section pass through the forward and rearward inclined sections of the drain trap section, the upper end of the first joint, which connects the forward inclined section and the hanging section by a first curved surface, is set to be higher than the upper end of the second joint, which connects the rearward inclined section and the hanging section by a second curved surface. As a result, the washing water and waste passing through the forward and rearward inclined sections can be guided from the drainage area on the front side (the first curved surface side of the first joint of the forward inclined section) to the lower hanging section, preferentially over the drainage area on the rear side (the rearward inclined section side).
As a result, waste is less likely to be guided towards the rearward sloping section and is instead guided from the forward side (the first curved surface side of the first joint of the forward sloping section) to the downward hanging section, thus preventing waste from clogging the flow path downstream of the bend in the drain trap section.

In the present invention, preferably, the rearward inclined portion is set such that, in a side cross-sectional view, its inclination angle with respect to the horizontal plane is greater than the inclination angle of the front inclined portion.
In the present invention configured in this way, the inclination angle of the rearward inclined section with respect to the horizontal plane in a side cross-sectional view is set to be greater than the inclination angle of the front inclined section. Therefore, the washing water and waste passing through the front inclined section and the rearward inclined section can be guided to the hanging section early in the drainage area on the front side (the first curved surface side of the first joint of the front inclined section).
Furthermore, the rearward inclined section, with a greater inclination angle than the front inclined section, can impart a strong pushing force to the washing water. This ensures that the washing water, with its powerful pushing force from the rear, reliably pushes the waste into the downward-hanging section.

In the present invention, preferably, the hanging portion is provided with a hanging inlet that is joined to the first joint and the second joint, and in a plan view of the hanging inlet, the cross-sectional area of the flow channel on the front side of the central axis in the front-rear direction of the flow channel cross-section is set to be larger than the cross-sectional area of the flow channel on the rear side of the central axis.
In the present invention configured as described above, in a plan view of the hanging inlet, the cross-sectional area of the flow channel on the front side of the central axis in the front-rear direction of the flow channel cross-section is set to be larger than the cross-sectional area of the flow channel on the rear side. Therefore, when waste from the upstream side of the hanging section flows into the hanging section from the hanging inlet, the waste can be guided into the hanging section early in the front side of the drainage area.

According to the flush toilet of the present invention, the flushing water containing waste that flows from the bent portion of the drain trap to the inclined portion can be smoothly guided to the downward-facing portion, thereby suppressing blockage of waste.

This is a schematic plan view of a flush toilet according to one embodiment of the present invention. This is a side cross-sectional view along line II-II in Figure 1. Figure 2 is a side cross-sectional view of a flush toilet according to one embodiment of the present invention, showing an enlarged side cross-sectional view of the downstream end portion of the drain trap section of the toilet bowl body. This is a cross-sectional view along the line IV-IV in Figure 2.

A flush toilet according to one embodiment of the present invention will be described below with reference to Figures 1 to 4.
First, Figure 1 is a schematic plan view of a flush toilet according to one embodiment of the present invention. Figure 2 is a side cross-sectional view taken along line II-II in Figure 1.
As shown in Figures 1 and 2, a flush toilet 1 according to one embodiment of the present invention comprises a ceramic toilet bowl body 2.
The toilet body 2 comprises a water channel 4, a bowl-shaped bowl section 6, and a drain trap section 8 (details to be described later) with an inlet 8a connected below the bowl section 6, extending from the upstream side to the downstream side.
As a result, the flush toilet 1 according to one embodiment of the present invention is a so-called "siphon-type flush toilet" that uses the siphon action to suck up the waste in the bowl 6 and discharge it to the outside all at once from the drain trap 8.
Furthermore, the flush toilet 1 according to one embodiment of the present invention is not limited to the form of a siphon-type flush toilet, but can also be applied to the form of a so-called "wash-down type flush toilet" that washes away waste with the flowing water action caused by the difference in water pressure within the bowl.

Furthermore, in the flush toilet 1 of this embodiment shown in Figures 1 and 2, a toilet seat (not shown) and a toilet lid (not shown) are provided on the upper surface of the toilet body 2, but since this is the same as the structure of a conventional flush toilet, a detailed explanation will be omitted.
Furthermore, on the upper surface of the toilet bowl 2, behind the toilet seat (not shown) and toilet lid (not shown), functional parts (not shown) such as a sanitary washing section (not shown) for washing the user's private parts and a water supply system functional section involved in the water supply function to the toilet bowl 2 may be provided. However, since these are the same as the structure of conventional flush toilets, a detailed explanation will be omitted.

Next, as shown in Figure 1, a flush toilet 1 according to one embodiment of the present invention is equipped with a gravity-fed water storage tank 10, which is a water source for flushing toilets, storing the flushing water used for flushing the toilet bowl and supplying it to the toilet bowl body 2.
In this embodiment, the water source that supplies flushing water to the toilet bowl 2 is not limited to a tank-type configuration such as the gravity-fed water storage tank 10 described above, but can be applied to other configurations as well. That is, the water source that supplies flushing water to the toilet bowl 2 may be a direct-pressure type configuration that directly utilizes the water supply pressure of the tap water, a flush valve type configuration, or a configuration that supplies flushing water using the supplemental pressure of a pump.

Next, in the flush toilet 1 according to one embodiment of the present invention shown in Figure 1, in a plan view of the bowl portion 6 of the toilet body 2, the central axis extending horizontally to the left and right so as to bisect the front-to-back direction with respect to the pot portion 12 provided in the left-right center of the bowl portion 6 is indicated by the symbol "X".
Furthermore, in the plan view of the bowl portion 6 of the toilet body 2 shown in Figure 1, the central axis extending horizontally in the front-to-back direction so as to bisect the bowl portion 6 in the left-to-right direction is indicated by the symbol "Y".
Furthermore, in the plan view of the bowl portion 6 of the toilet body 2 shown in Figure 1, the intersection of the respective central axes X and Y is defined as the center O of the bowl portion 6 in the plan view, and the central axis extending vertically through this center O is indicated by the symbol "Z" in Figures 1 and 2.
Furthermore, as shown in Figure 1, the front, back, left, and right directions of the flush toilet 1 are indicated as "front,""back,""left," and "right," respectively.

Furthermore, as shown in Figures 1 and 2, in the flush toilet 1 of this embodiment, the area within the bowl portion 6 that is forward of the central axis X is defined as the "front region F of the bowl portion 6". In addition, within this front region F of the bowl portion 6, the left region L and the right region R are defined as the "left front region LF of the bowl portion 6" and the "right front region RF of the bowl portion 6" with respect to the central axis Y in the horizontal front-rear direction of the bowl portion 6, respectively.
Similarly, within the bowl portion 6, the area behind the central axis X is defined as the "rear area B of the bowl portion 6". Furthermore, within this rear area B of the bowl portion 6, the left area L and the right area R are defined as the "left rear area LB of the bowl portion 6" and the "right rear area RB of the bowl portion 6" with respect to the horizontal front-rear central axis Y of the bowl portion 6, respectively.

Next, as shown in Figure 1, the water conduit 4 located upstream of the toilet bowl body 2 is formed on the rear side of the bowl portion 6 and guides the flushing water supplied from the water storage tank 10 to the bowl portion 6.
Furthermore, as shown in Figures 1 and 2, the bowl portion 6 located downstream of the water conduit 4 of the toilet body 2 is equipped with a pot portion 12, a waste receiving surface 14, a shelf portion 16, and a rim portion 18, which will be described in detail later, from bottom to top.
Furthermore, a first rim outlet 20 is provided on the front side of the rim portion 18 in the left rear region LB of the bowl portion 6, and a second rim outlet 22 is provided on the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6.

Next, as shown in Figures 1 and 2, the water conduit 4 comprises a common water conduit 24, a first rim water conduit 26, and a second rim water conduit 28.
First, the common water conduit 24 is formed inside the toilet bowl body 2 on the rear side of the bowl portion 6, extending from the rear inlet 4a connected to the water storage tank 10 to the vicinity of the rear side of the front bowl portion 6.
Furthermore, the first rim water channel 26 is formed inside the rim portion 18 of the left rear region LB of the bowl portion 6, so as to branch off from the common water channel 24 to the left side of the bowl portion 6 near the rear side of the bowl portion 6, and then extend to the first rim outlet 20 on the front side while bypassing the outer circumferential surface of the bowl portion 6.
As a result, the cleaning water supplied from the common water channel 24 to the first rim water channel 26 is discharged forward as the first rim discharge from the first rim discharge port 20 toward the shelf section 16 in front of it, and then forms a swirling flow that moves from the left front region LF through the right front region RF to the right rear region RB within the bowl section 6.

Furthermore, the second rim water channel 28 branches off from the common water channel 24 to the right of the bowl portion 6 near the rear side of the bowl portion 6, then bends (makes a U-turn) towards the second rim outlet 22 on the left side near the right side of the toilet body 2, and is formed inside the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6 so as to extend to the second rim outlet 22.
As a result, the cleaning water supplied from the common water channel 24 to the second rim water channel 28 is discharged from the second rim outlet 22 towards the shelf section 16 behind it as the second rim discharge, then swirls from the right rear area RB to the left rear area LB and then to the left front area LF within the bowl section 6, before flowing from this left front area LF into the front area within the pot section 12.
Furthermore, a portion of the water discharged from the second rim outlet 22 flows into the rear area of the bowl portion 12 from the waste receiving surface 14 in the area behind the bowl portion 12.
In this embodiment, the shelf portion 16 of the bowl portion 6 is described as being provided between the outer edge of the waste receiving surface 14 and the lower end of the rim portion 18. However, it is not necessary to provide the shelf portion 16, and the shelf portion 16 may be omitted, with the first rim discharge and second rim discharge, respectively, being discharged from the first rim discharge port 20 and the second rim discharge port 22, being discharged directly to the upper edge of the waste receiving surface 14 without passing through the shelf portion 16.

Next, with reference to Figures 1 to 4, the details of the drain trap section 8 and its downstream portion will be described.
Figure 3 is an enlarged side cross-sectional view of the downstream end portion of the drain trap section of the toilet bowl body, in the side cross-sectional view of the flush toilet according to one embodiment of the present invention shown in Figure 2. Figure 4 is a cross-sectional view taken along the line IV-IV in Figure 2.
First, as shown in Figure 2, the drain trap section 8 is equipped with a bent section 30, a forward-sloping section 32, a rearward-sloping section 34, and a hanging section 36, respectively, from its upstream side (inlet 8a side) to its downstream side.

As shown in Figure 2, the bent portion 30 of the drain trap section 8 descends from the inlet 8a of the drain trap section 8 toward the rear and downward to the lowest end 30a, and then extends further toward the rear and upward from this lowest end 30a.
Next, as shown in Figures 2 and 3, the forward inclined portion 32 of the drain trap section 8 is formed to incline backward and downward from the downstream end (rear end 30b) of the bent portion 30.
Furthermore, as shown in Figures 2 and 3, the rearward inclined portion 34 of the drain trap section 8 is provided so as to face the rearward inclined portion 32.
Furthermore, as shown in Figures 2 and 3, the hanging portion 36 of the drain trap section 8 is positioned below the lower ends of the forward-sloping portion 32 and the rearward-sloping portion 34, respectively, forming a pipe that hangs downward.

Furthermore, as shown in Figure 3, the drain trap section 8 further includes a first joint section 38 that joins the forward inclined section 32 and the hanging section 36 by a curved surface (first curved surface C1), and a second joint section 40 that joins the rear inclined section 34 and the hanging section 36 by a curved surface (second curved surface C2).
Furthermore, as shown in Figure 3, the height range H1 of the entire vertical portion of the second joint 40 from its lower end 40a to its upper end 40b is located within the height range H2 of the first joint 38 from its lower end 38a to its upper end 38b, and the upper end 38b of the first joint 38 is set to a higher position than the upper end 40b of the second joint 40.

In the side cross-sectional view of Figure 3, the curvature of the first curved surface C1 in the section between the lower end 38a and the upper end 38b of the first joint 38 is set to be greater than the curvature of the inner wall surface 32a of the forward inclined portion 32 above the upper end 38b of the first joint 38.
Furthermore, in the side cross-sectional view of Figure 3, the curvature of the first curved surface C1 of the first joint 38 is set to be greater than the curvature of the inner wall surface 36a of the hanging portion 36 below the lower end 38a of the first joint 38.
Similarly, in the side cross-sectional view of Figure 3, the curvature of the second curved surface C2 in the section between the lower end 40a and the upper end 40b of the second joint 40 is set to be greater than the curvature of the inner wall surface 34a of the rearward inclined portion 34 above the upper end 40b of the second joint 40.
Furthermore, in the side cross-sectional view of Figure 3, the curvature of the second curved surface C2 of the second joint 40 is set to be greater than the curvature of the inner wall surface 36a of the hanging portion 36 below the lower end 40a of the second joint 40.
Furthermore, in the side cross-sectional view of Figure 3, the curvature of the first curved surface C1 of the first joint 38 is set to be greater than the curvature of the second curved surface C2 of the second joint 40.

Next, as shown in Figure 3, the rearward inclined portion 34 is set such that, in a side cross-sectional view, the inclination angle α of its inner wall surface 34a with respect to the horizontal plane is greater than the inclination angle β of the inner wall surface 32a of the frontward inclined portion 32 (α > β).
Furthermore, as shown in Figure 4, the hanging portion 36 is provided with a hanging inlet 36b that is joined to the first joint 38 and the second joint 40. In the plan cross-sectional view of Figure 4, the hanging inlet 36b is set such that the flow channel cross-sectional area A1 on the front side of the central axis O1 in the front-rear direction of the flow channel cross-section S0 is larger than the flow channel cross-sectional area A2 on the rear side of the central axis O1 (A1 > A2).

According to the flush toilet 1 of the embodiment described above, the flushing water and waste in the bowl portion 6 of the toilet body 2 are discharged into the bent portion 30 of the drain trap portion 8 from the inlet 8a of the drain trap portion 8.
Subsequently, the waste that has passed through the bent section 30 of the drain trap section 8 along with the flushing water passes through the forward inclined section 32 and the rear inclined section 34 of the drain trap section 8 downstream, and is then discharged from the hanging section 36 of the drain trap section 8 through a drain socket (not shown) to the drain pipe (not shown) outside the flush toilet 1.
Furthermore, when the washing water and waste W that have passed through the bent portion 30 of the drain trap portion 8 pass through the forward inclined portion 32 and the rear inclined portion 34 of the drain trap portion 8, the height range H1 of the entire vertical portion of the second joint portion 40 from the lower end 40a to the upper end 40b is located within the height range H2 of the first joint portion 38 from the lower end 38a to the upper end 38b, and the upper end 38b of the first joint portion 38 is set to be higher than the upper end 40b of the second joint portion 40.
As a result, the washing water and waste W passing through the forward-sloping section 32 and the rear-sloping section can be guided from the forward side (the side of the first curved surface C1 of the first joint 38 of the forward-sloping section 32) to the downward-hanging section 36, preferentially over the rear side (the side of the rear-sloping section 34).
As a result, waste is less likely to be guided towards the rearward inclined section 34 and is instead guided from the forward side (the first curved surface C1 side of the first joint 38 of the forward inclined section 32) to the downward hanging section 36, thereby preventing waste from clogging the flow path downstream of the bent section 30 of the drain trap section 8.

Furthermore, according to the flush toilet 1 of this embodiment, as shown in Figure 3, the inclination angle α of the rearward inclined portion 34 with respect to the horizontal plane in a side cross-sectional view is set to be greater than the inclination angle β of the frontward inclined portion 32.
As a result, the washing water and waste W passing through the forward-sloping section 32 and the rearward-sloping section 34 can be guided to the hanging section 36 early in the forward-facing section (the first curved surface C1 side of the first joint 38 of the forward-sloping section 32).
Furthermore, the rearward inclined section 34, with an inclination angle α greater than the inclination angle β of the front inclined section 32, can provide a strong pushing force to the washing water. As a result, the washing water, which also has a strong pushing force from the rear, can reliably push the waste into the downward hanging section 36.

Furthermore, according to the flush toilet 1 of this embodiment, as shown in Figure 4, in a plan view of the hanging inlet 36b, the flow path cross-sectional area A1 on the front side of the central axis O1 in the front-rear direction of the flow path cross-section S0 is set to be larger than the flow path cross-sectional area A2 on the rear side.
As a result, when waste from the upstream side of the hanging section 36 flows into the hanging section 36 from the hanging inlet 36b, the waste can be guided into the hanging section 36 early in the forward drainage area.

1 Flush toilet 2 Toilet bowl body 4 Water channel 4a Inlet of water channel 6 Bowl section 8 Drain trap section 8a Inlet of drain trap section 10 Water storage tank 12 Jar section 14 Waste receiving surface 14a Lower edge of waste receiving surface 16 Shelf section 18 Rim section 20 First rim outlet 22 Second rim outlet 24 Common water channel 26 First rim water channel 28 Second rim water channel 30 Bent section of drain trap section 30a Lower end of bent section 30b Downstream end, rear end of bent section 32 Forward inclined section of drain trap section 32a Inner wall surface of forward inclined section 34 Rearward inclined section of drain trap section 34a Inner wall surface of rearward inclined section 36 Hanging section of drain trap section 36a Inner wall surface of hanging section 36b Hanging inlet 38 First joint section 38a Lower end of the first joint 38b Upper end of the first joint 40 Second joint 40a Lower end of the second joint 40b Upper end of the second joint A1 Cross-sectional area of the flow channel in front of the central axis in the front-rear direction of the flow channel cross-section of the hanging inlet A2 Cross-sectional area of the flow channel in rear of the central axis in the front-rear direction of the flow channel cross-section of the hanging inlet B Rear region of the bowl C1 First curved surface C2 Second curved surface F Front region of the bowl H1 Range of height positions of the entire vertical part from the lower end to the upper end of the second joint H2 Range of height positions of the entire vertical part from the lower end to the upper end of the first joint L Left region of the bowl LB Left rear region of the bowl LF Left front region of the bowl O Center of the bowl, center of the pot in the front-rear direction O1 Central axis in the front-rear direction of the flow channel cross-section of the hanging inlet R Right region of the bowl RB Right rear region of the bowl RF Right front region of the bowl S0 Cross-section of the flow path at the hanging inlet: W: Washing water and waste; X: Horizontal left-right central axis of the bowl section; Y: Horizontal front-back central axis of the bowl section; Z: Vertical central axis passing through the center of the bowl section; α: Inclination angle of the inner wall surface of the rearward inclined section of the drain trap section; β: Inclination angle of the inner wall surface of the frontward inclined section of the drain trap section.

Claims (3)

A flush toilet that uses flushing water to wash away waste,
The bowl-shaped bowl section,
It has an inlet connected to the lower part of the bowl and a drain trap section for discharging waste from the bowl,
The drain trap section described above has a bent section that extends from its inlet downwards and backwards, and then rises upwards and backwards,
A forward-sloping section that slopes rearward and downward from the downstream end of this bend,
A rearward-sloping section is provided to face the rearward-sloping section of this forward-sloping section,
The hanging portions that extend downstream from the forward-sloping portion and the backward-sloping portion,
A first joint portion that joins the above-mentioned forward-sloping portion and the above-mentioned hanging portion by a first curved surface having a first curvature in a central side cross-sectional view,
The system includes a second joint that joins the aforementioned rearward inclined portion and the aforementioned hanging portion by a second curved surface having a second curvature in a central side cross-sectional view,
The upper end of the rearward inclined portion is located below the upper end of the forward inclined portion, and in the central side cross-sectional view of the first joint and the second joint, the first curvature of the first curved surface is set to be greater than the curvature of the inner wall surface of the forward inclined portion above the upper end of the first joint, and also greater than the curvature of the inner wall surface of the hanging portion below the lower end of the first joint, and the second curvature of the second curved surface is set to be greater than the curvature of the inner wall surface of the rearward inclined portion above the upper end of the second joint, and the second joint A flush toilet characterized in that the curvature of the inner wall surface of the hanging portion below the lower end of the part is set to be greater than the curvature of the inner wall surface of the hanging portion below the lower end of the part, the first curvature of the first curved surface is set to be greater than the second curvature of the second curved surface, the entire vertical portion from the lower end to the upper end of the second joint is located within the range of vertical height positions from the lower end to the upper end of the first joint, and the upper end of the first joint is set to be lower than the height position of the entrance of the drain trap part and higher than the upper end of the second joint. The flush toilet according to claim 1, wherein the rearward inclined portion is set such that, in a central side cross-sectional view, its inclination angle with respect to the horizontal plane is greater than the inclination angle of the frontward inclined portion. The above-mentioned hanging portion is provided with a hanging inlet joined to the first joint and the second joint, and the hanging inlet is configured such that, in a plan view, the cross-sectional area of the flow path on the front side of the central axis in the front-rear direction of the flow path cross-section is larger than the cross-sectional area of the flow path on the rear side of the central axis. This is the flush toilet according to claim 1 or 2.