JP2023124266A - Flush toilet bowl - Google Patents

Abstract

To provide a flush toilet bowl capable of sufficiently washing an upper area within a bowl part while suppressing splashing of washing water discharged from a rim water discharge port by placing the rim water discharge port higher up also regarding a height position of the rim water discharge port relative to the bowl part.SOLUTION: A flush toilet bowl 1 according to the present invention has a rim conduit 28 provided inside a rim part on one side with respect to a center axis in a left-right direction of a bowl part, wherein the rim conduit 28 comprises a rear conduit 30, a curbed conduit 32, and a front conduit 34, and the curved conduit comprises: a rising part 40 including a second rising bottom surface 40a that rises from a downstream end of a first rising bottom surface 36 of the rear conduit; a highest part 42 including a highest bottom surface 42a that is provided on a downstream side of the rising part and is the highest position on an entire bottom surface of the rim conduit; and a descending part 44 including a descending bottom surface 44a that descends from a downstream end of the highest bottom surface of the highest part to an upstream end of the front conduit.SELECTED DRAWING: Figure 7

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flush toilet bowl, and more particularly to a flush toilet bowl that is washed with flush water to discharge waste.

2. Description of the Related Art Conventionally, as a flush toilet that is washed with flush water to discharge waste, for example, as described in Patent Document 1, a rim conduit provided inside a rim portion of a toilet body is provided, It is known that wash water is spouted into the bowl from a rim spout at the downstream end of the rim conduit to form a swirling flow.
Further, in the above-described conventional flush toilet, the rim conduit has a curved channel extending to the rim spout by being curved, and an upstream channel formed on the upstream side of the curved channel. , and the downstream end portion of the upstream side channel is formed with a channel enlarged portion in which the channel cross-sectional area expands toward the downstream side.
The wash water in the upstream channel of the rim water channel flows into the curved channel with its flow velocity reduced by passing through the enlarged channel portion. It is possible to suppress the bursting of bubbles and the occurrence of turbulence when flowing into the curved flow path.

JP 2020-26699 A

However, in the conventional flush toilet described in Patent Document 1 mentioned above, the flow velocity of the flush water in the upstream channel of the rim conduit is reduced when it flows into the curved channel from the enlarged channel portion. state.
Therefore, when the cleansing water flowing out from the curved flow path is spouted from the rim spout, the flow vector of the cleansing water spouted from the rim spout must be should be set downwards. Therefore, the height position of the rim spout must be lowered, and there is a possibility that the upper region within the bowl portion may not be sufficiently cleaned.
Therefore, in order to suppress splashing of cleansing water discharged from the rim spout and sufficiently wash the upper area in the bowl, the height position of the rim spout relative to the bowl should be arranged upward. is an issue that has been requested in recent years.

Therefore, the present invention has been made to solve the above-described problems of the prior art and problems that have been requested in recent years. To provide a flush toilet capable of sufficiently washing an upper region in a bowl part while suppressing splashing of flush water spouted from a rim spout.

In order to solve the above-described problems, the present invention provides a flush toilet that is flushed with flush water supplied from a flush water source to discharge waste, comprising a bowl-shaped waste receiving surface and an upper portion of the waste receiving surface. a bowl portion provided below the waste receiving surface and forming a water storage portion with stored water; On the other hand, a rim water conduit is provided inside the rim on one side and guides the washing water supplied from the washing water source to the bowl side, and a rim water outlet is provided at the downstream end of the rim water conduit. and a rim water discharge section that discharges wash water in the rim water conduit from the rim water discharge port into the bowl section to form a swirling flow, the rim water conduit being provided behind and on the upstream side thereof. a rear water conduit provided on the front and downstream side of the rear water conduit; a front water conduit extending from the downstream end of the rear water conduit toward the outside of the rim; a bent waterway bent inward and connected to an upstream end of the front waterway, wherein the rim spout is provided at a downstream end of the front waterway and extends rearwardly. The curved water conduit is configured to discharge water, and has a rising portion that rises in the direction of the flow path, and a highest bottom surface that is provided downstream of the rising portion and is the highest position in the entire bottom surface of the rim water conduit. and a descending portion including a descending bottom surface provided on the downstream side of the highest portion and descending from the downstream end of the highest bottom surface to the upstream end of the front water conduit. .
In the present invention configured as described above, the ascending portion of the curved water conduit rises in the direction of the flow path to the rearmost portion including the highest bottom surface, which is the highest position in the entire bottom surface of the rim water conduit.
With this, the wash water supplied from the wash water source to the rim water conduit can flow from the rear water conduit toward the curved water conduit, and then rise to the highest point along the ascending portion of the curved water conduit.
Also, the bottom surface of the rim conduit descends from the highest bottom surface of the highest part of the bent conduit to the front conduit via the descending bottom surface of the descending part.
As a result, the wash water that reaches the highest part of the curved waterway from the upstream side descends from the highest bottom of the curved waterway along the descending bottom of the descending part to the front waterway, and then downstream of the front waterway. A swirling flow can be formed by spouting water from the rim spout at the end toward the rear in the bowl portion.
At this time, the wash water descending from the highest bottom of the bent waterway to the front waterway along the descending bottom of the descending part forms a large downward flow vector toward the rim spout. Therefore, the wash water spouted from the rim spout can be easily directed into the rear bowl portion, and the upward splashing of the water can be prevented.
Furthermore, since the highest part of the curved water conduit of the rim water conduit can be provided at a position higher than the bowl part, the height position of the rim spout with respect to the bowl part can also be arranged higher. .
Therefore, the wash water spouted rearward into the bowl from the rim spout can sufficiently wash the upper region inside the bowl.

In the present invention, preferably, the descending portion of the curved water conduit further includes a top surface provided above the descending bottom surface, and the top surface descends from the upstream side toward the downstream side. A top surface is provided, and the descending inclination angle of the descending top surface descending with respect to the horizontal plane is set to be larger than the descending inclination angle of descending the descending bottom surface relative to the horizontal surface.
In the present invention configured as described above, the wash water rising along the rising portion of the curved waterway of the rim waterway will rise due to the centrifugal force even when it flows to the highest bottom of the curved waterway. to form a flow.
As a result, the dimension and shape of the top surface of the curved water channel have a greater influence on the flow vector of the wash water in the curved water channel than the size and shape of the bottom surface of the curved water channel.
However, when the wash water flows from the highest bottom surface of the curved water conduit along the descending bottom surface of the descending part, the downward inclination angle at which the descending top surface of the descending part of the curved water conduit descends with respect to the horizontal plane Since the bottom surface of the descending part of the water conduit is set to be larger than the downward inclination angle of the downward slope with respect to the horizontal plane, the wash water flowing on the highest bottom surface of the highest part of the curved water conduit descends the curved water conduit. A large downward flow vector can be formed toward the rim spout when descending from the rim to the forward conduit.
Therefore, the wash water spouted from the rim spout can be easily directed into the rear bowl portion, and the upward splashing of the water can be prevented.
Therefore, since the highest part of the curved water conduit of the rim water conduit can be provided at a position higher than the bowl part, the position of the rim spout can also be arranged higher with respect to the bowl part.
As a result, the wash water spouted rearward into the bowl from the rim spout can sufficiently wash the upper region inside the bowl.

In the present invention, preferably, the bent waterway further includes a maximum curvature portion in which the radius of curvature in plan view of the inner peripheral surface is the minimum, and the highest portion is upstream of the maximum curvature portion. are placed in
In the present invention configured as described above, the maximum curvature portion where the radius of curvature in plan view of the inner peripheral surface of the curved waterway is the smallest has a great influence on the dimensions and shape of the curved waterway. It is a place that greatly changes the direction of the flow of wash water in the water channel.
However, since the highest part of the crooked water channel is located upstream from the maximum curvature part, the maximum curvature part of the crooked water channel is located at the descending part of the crooked water channel. When the wash water that has flowed down the highest bottom surface of the highest part of the rim descends from the descending part of the curved water conduit to the front water conduit, a large downward flow vector toward the rim spout can be formed.
Therefore, the wash water spouted from the rim spout can be easily directed into the rear bowl portion, and the upward splashing of the water can be prevented.
Therefore, since the highest part of the curved water conduit of the rim water conduit can be provided at a position higher than the bowl part, the position of the rim spout can also be arranged higher with respect to the bowl part.
As a result, the wash water spouted rearward into the bowl from the rim spout can sufficiently wash the upper region inside the bowl.

In the present invention, preferably, the rim spout further includes a stepped portion provided in the vicinity of the downstream side of the rim spout, and the stepped portion expands upward from the opening area of the rim spout. forming an open area.
In the present invention configured as described above, the rim spouting portion includes a stepped portion provided in the vicinity of the downstream side of the rim spouting port, and the stepped portion expands upward from the opening area of the rim spouting port. Since the area is formed, the wash water discharged from the rim spout flows from the rim spout to the top surface of the step due to the stepped portion near the downstream side of the rim spout. It is possible to suppress the so-called "Coanda effect" in which the water is attracted to the rim spout or attempts to maintain the flow along the top surface on the downstream side from the rim spout.
Therefore, it is possible to prevent the wash water discharged from the rim spout from escaping upward, so that it is possible to prevent the wash water from spouting from the rim spout from splashing out of the bowl. can.

In the present invention, preferably, the descending bottom surface of the descending portion of the curved water conduit is a first descending bottom surface, and the front water conduit is a downstream end of the first descending bottom surface of the descending portion of the curved water conduit. to the rim spouting port, and the downward inclination angle at which the bottom surface of the rim spouting portion descends from the upstream side to the downstream side with respect to the horizontal plane is the first descending bottom surface or the second The descending bottom surface is set to be smaller than the descending inclination angle with respect to the horizontal plane.
In the present invention configured as described above, the descending inclination angle at which the bottom surface of the rim water discharge portion descends from the upstream side to the downstream side with respect to the horizontal plane is the first descending bottom surface of the descending portion of the curved water conduit or the forward guide. Since the second descending bottom surface of the water channel is set to be smaller than the descending angle of inclination with respect to the horizontal plane, the wash water immediately after being spouted from the rim spout is prevented from splashing out of the bowl. While restrained, it can be temporarily directed to an upper region within the bowl.
Therefore, the wash water spouted from the rim spout can sufficiently wash the upper region within the bowl portion.

According to the flush toilet of the present invention, the height position of the rim spout with respect to the bowl portion is also arranged higher, thereby suppressing splashing of the flush water spouted from the rim spout while maintaining the flow of water in the bowl portion. The upper area can be thoroughly cleaned.

1 is a schematic plan view of a flush toilet according to one embodiment of the present invention; FIG. FIG. 2 is a side cross-sectional view taken along line II-II of FIG. 1; FIG. 4 is a partially enlarged plan view showing an enlarged second rim water conduit portion of the toilet body in the schematic plan view of the flush toilet according to the embodiment of the present invention shown in FIG. 1; FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3; FIG. 4 is a cross-sectional view taken along line VV of FIG. 3; 4 is a cross-sectional view taken along line VI-VI of FIG. 3; FIG. FIG. 4 is a cross-sectional view taken along line VII-VII of FIG. 3;

A flush toilet according to an embodiment of the present invention will be described below with reference to the accompanying drawings.
First, FIG. 1 is a schematic plan view of a flush toilet according to one embodiment of the present invention. 2 is a side sectional view taken along line II-II of FIG. 1. FIG.
As shown in FIGS. 1 and 2, a flush toilet 1 according to one embodiment of the present invention includes a toilet body 2 made of ceramic.
The toilet bowl main body 2 includes, from the upstream side to the downstream side, a water conduit 4, a bowl-shaped bowl portion 6, and a drainage trap portion 8 to which an inlet 8a is connected below the bowl portion 6. .
As a result, the flush toilet 1 according to the embodiment of the present invention uses the siphon action to suck in the waste in the bowl portion 6 and discharges it to the outside at once from the drain trap portion 8, which is a so-called "siphon type flushing." It is a urinal.
The flush toilet 1 according to one embodiment of the present invention is not limited to the form of a siphon type flush toilet. It is also applicable to the form of "toilet bowl".

In addition, in the flush toilet bowl 1 of the present embodiment shown in FIGS. 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. The structure of the flush toilet is the same as that of the flush toilet, so a detailed description will be omitted.
Further, behind the toilet seat (not shown) and the toilet lid (not shown) on the upper surface of the toilet bowl body 2, there are a sanitary washing unit (not shown) for washing the private parts of the user and a water supply for the toilet bowl body 2. A functional unit (not shown) such as a water supply system functional unit that is involved in the function may be provided, but these are also similar to the structure of a conventional flush toilet, so a specific description will be given. omitted.

Next, as shown in FIG. 1, the flush toilet 1 according to one embodiment of the present invention is a gravity feed type water storage that is a flush water source for storing flush water used for flushing the toilet bowl and supplying it to the toilet bowl main body 2 . A tank 10 is provided.
Here, in the present embodiment, the flushing water source for supplying flushing water to the toilet body 2 is not limited to a tank type such as the above-described gravity-fed water storage tank 10, and may be applied to other configurations. be. That is, the flushing water source that supplies flushing water to the toilet body 2 may be of a tap water direct pressure type or a flush valve type that directly utilizes the water supply pressure of tap water, or may utilize pump compensation pressure. It may be in the form of supplying the washing water.

Next, in the flush toilet 1 according to one embodiment of the present invention shown in FIG. A central axis extending in the horizontal direction so as to bisect the vehicle in the front-rear direction is indicated by the symbol “X”.
Further, in a plan view of the bowl portion 6 of the toilet body 2 shown in FIG. 1, the center axis extending in the horizontal front-rear direction so as to bisect the bowl portion 6 in the left-right direction is indicated by the symbol "Y".
Furthermore, in a plan view of the bowl portion 6 of the toilet body 2 shown in FIG. The axis is indicated in FIGS. 1 and 2 by the symbol "Z".
Further, as shown in FIG. 1, the front, rear, left, and right directions of the flush toilet 1 are indicated by "front,""rear,""left," and "right," respectively.

Further, as shown in FIGS. 1 and 2, in the flush toilet 1 of the present embodiment, regarding the region inside the bowl portion 6, the region on the front side of the central axis X is defined as a “front region F of the bowl portion 6”. defined as Further, in the front region F of the bowl portion 6, a left region L and a right region R with respect to the center axis Y in the horizontal front-rear direction of the bowl portion 6 are referred to as a “left front region LF of the bowl portion 6” and a “bow portion”, respectively. 6 right front region RF”.
Similarly, with respect to the area inside the bowl portion 6, the area on the rear side of the center axis X is defined as "the rear area B of the bowl portion 6". Further, in the rear region B of the bowl portion 6, a left region L and a right region R with respect to the center axis Y in the horizontal front-rear direction of the bowl portion 6 are referred to as a “left rear region LB of the bowl portion 6” and a “bowl portion”, respectively. 6 right rear region RB”.

Next, as shown in FIG. 1, the water conduit 4 located upstream of the toilet body 2 is formed behind the bowl portion 6 so as to guide flush water supplied from the water storage tank 10 to the bowl portion 6. It has become.
1 and 2, the bowl portion 6 located on the downstream side of the water conduit 4 of the toilet body 2 is a jar portion connected to the inlet 8a of the drainage trap portion 8 from the bottom to the top. 12 , a dirt receiving surface 14 , a ledge 16 and a rim 18 .
Further, a first rim spout 20 is provided on the front side of the rim portion 18 in the left rear region LB of the bowl portion 6, and on the rear side of the rim portion 18 in the right rear region RB of the bowl portion 6, A second rim spout 22 is provided.

Next, as shown in FIGS. 1 and 2, the water conduit 4 includes a main water conduit 24, a first rim water conduit 26, and a second rim water conduit .
First, the main water channel 24 is a central water channel provided in the center in the left-right direction on the rear side of the bowl portion 6 in the toilet body 2, and extends from the rear entrance 4a connected to the water storage tank 10 to the front bowl portion. It is formed so as to extend in the front-rear direction up to the vicinity of the back side of 6 .
Next, the first rim water conduit 26 branches from the front end of the main water conduit 24 in the vicinity of the back side of the bowl section 6 to the left side of the bowl section 6, and then branches off to the front side while bypassing the outer peripheral surface of the bowl section 6. It is formed inside the rim portion 18 in the left rear region LB of the bowl portion 6 so as to extend to the first rim spout 20 .
As a result, the wash water supplied from the main waterway 24 to the first rim waterway 26 is spouted forward from the first rim water spout 20 toward the shelf portion 16 on the front side thereof as the first rim water spout. A swirling flow that swirls from the left front region LF in the bowl portion 6 to the right rear region RB via the right front region RF is formed.

Next, the second rim water conduit 28 branches from the main water conduit 24 near the back side of the bowl part 6 to the right side of the bowl part 6, and then, near the right side part of the toilet body 2, the second rim water discharge on the left side. It 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 bend (U-turn) toward the water outlet 22 and extend to the second rim spout 22 .
As a result, the wash water supplied from the main waterway 24 to the second rim waterway 28 is spouted backward from the second rim water spout 22 toward the shelf 16 on the rear side as the second rim water spout. After turning from the right rear area RB in the bowl portion 6 to the left front area LF through the left rear area LB, it flows into the front area in the pot portion 12 from the left front area LF.
Also, part of the second rim spout water spouted from the second rim spout 22 flows into the rear region of the bowl portion 12 from the filth receiving surface 14 in the region rearward of the pot portion 12 of the bowl portion 6 . is also
Furthermore, in the present embodiment, the ledge 16 of the bowl 6 is provided between the outer edge of the dirt receiving surface 14 and the lower end of the rim 18, but the ledge 16 is not necessarily provided. Instead, the shelf portion 16 is omitted, and the first rim spout and the second rim spout water spouted from the first rim spout 20 and the second rim spout 22, respectively, do not pass through the shelf portion 16 and reach the waste receptacle. Water may be jetted directly onto the upper edge of surface 14 .
In addition, the details of each water conduit in the entire section of the second rim water conduit 28 and the water conduit in the vicinity of the downstream side of the second rim spout 22 will be described later.

Next, with reference to FIGS. 1 to 7, the details of each water conduit in the entire section of the second rim water conduit 28 and the water conduit in the vicinity of the downstream side of the second rim spout 22 will be described.
First, FIG. 3 is a partially enlarged plan view of the second rim conduit portion of the toilet body in the schematic plan view of the flush toilet according to the embodiment of the present invention shown in FIG. 4 to 7 are cross-sectional views along lines IV-IV, VV, VI-VI and VII-VII in FIG. 3, respectively.
Here, in each of the waterways in the entire section of the second rim waterway 28 and in the waterway near the downstream side of the second rim spout 22 shown in FIGS. Boundary positions are indicated by symbols P1 to P8 from the upstream side to the downstream side.

As shown in FIGS. 3-6, the second rim waterway 28 includes a rear waterway 30, a curved waterway 32, and a front waterway 34 from upstream to downstream.
First, as shown in FIGS. 3 to 5, the rear water conduit 30 is the water conduit that is provided on the rearmost side among all the sections of the second rim water conduit 28 . In addition, the laterally inner end portion 30a (the upstream end of the position P1) of the rear water channel 30 is located on one lateral side of the front end portion 24a of the main waterway 24 (seeing the main waterway 24 shown in FIG. 3 from the front side). right).

Next, as shown in FIGS. 3 , 4 and 6 , the front water conduit 34 is a water conduit provided on the front side of the rear water conduit 30 . A second rim water outlet 22 is provided at an inner end portion (the inner end portion 34a and the downstream end of the front water channel 34) of the front water channel 34 in the left-right direction.
As a result, the wash water spouted from the second rim spout 22 is spouted toward the rear region of the dirt receiving surface 14 on the inner side in the left-right direction and the rear side of the pot portion 12 .

Next, as shown in FIGS. 3 to 6, the curved water conduit 32 is a water conduit provided between the rear water conduit 30 and the front water conduit 34, and extends over the entire section of the second rim water conduit 28. Above all, it is the water channel provided on the outermost side in the horizontal direction (the rightmost water channel when viewed from the front side of the second rim water channel 28).
In addition, in the bent waterway 32, the rear and left-right inner ends (the rear inner end 32a and the upstream end of the bent waterway 32) correspond to the left-right outer ends 30b (downstream end).
Further, the curved water conduit 32 extends from its rear inner end portion 32a toward the outside in the left-right direction of the rim portion 18 (the right side in the left-right direction when viewed from the front side of the second rim water conduit 28), and then bends. It is formed so as to bend from the laterally outer end portion 32b of the water channel 32 toward the laterally inner side of the rim portion 18 (the filth receiving surface 14 side of the bowl portion 6).
As a result, the front and left-right inner ends of the bent water passage 32 (the front inner end 32c and the downstream end of the bent water passage 32) are aligned with the left-right outer ends of the front water passage 34 (front water passage 34 are connected to the outer end 34b and the upstream end of the .

Here, the boundary surface (flow passage cross section S1) between the rear water conduit 30 and the curved water conduit 32 extends linearly in the left-right direction of the rear water conduit 30 in plan view shown in FIG. ) From the inner inner peripheral surface 30c and the outer inner peripheral surface 30d, the inner inner peripheral surface 32d and the outer inner peripheral surface 32d having a curvature radius (the curvature is larger than 0) in the curved waterway 32 in plan view shown in FIG. It is defined as a cross-section of the flow path at the point where it transitions to each of the surfaces 32e.
Similarly, the boundary surface (passage cross section S2) between the curved water conduit 32 and the front water conduit 34 also has the radius of curvature of the curved water conduit 32 in plan view shown in FIG. 3 (the curvature is greater than 0). An inner inner peripheral surface 34c and an outer inner peripheral surface 34c and an outer inner peripheral surface 34c extending linearly in the left-right direction (having a curvature of 0) in the front water channel 34 in plan view shown in FIG. It is defined as a cross-section of the flow path at the point where it transitions to each of the surfaces 34d.

Next, as shown in FIGS. 3 to 5 and 7, the rear waterway 30 is a first rising bottom for raising the wash water supplied from the main waterway 24 side toward the curved waterway 32. 36 (upstream rising bottom surface 36a, downstream rising bottom surface 36b).
5 and 7, the upstream rising bottom surface 36a of the rear water channel 30 is connected to the downstream rising bottom surface 36b from the upstream end 36c connected to the front end portion 24a of the main waterway 24. It is formed so as to rise in a convex curve upward to the downstream end 36d (position P2).
On the other hand, the downstream rising bottom surface 36b of the rear water channel 30 has a downstream end 36e connected from the downstream end 36d of the upstream rising bottom surface 36a to the upstream end 32a of the curved water channel 32 in the vertical cross-sectional views of FIGS. It is formed so as to gently rise almost flatly or linearly up to (position P3).
In addition, the rear water conduit 30 has a top surface 38 (an upstream top surface 38a and a It has a side top surface 38b). Each top surface 38a, 38b of the rear water conduit 30 is formed substantially flat from its upstream end to its downstream end.

Next, as shown in FIGS. 3 to 7, the crooked water conduit 32 has an ascending portion 40, a highest portion 42, and a descending portion 44 from the upstream side to the downstream side.
First, the ascending portion 40 of the curved water conduit 32 has an ascending bottom surface 40 a which is a second ascending bottom surface rising from the downstream end 36 e of the ascending bottom surface 36 of the rear water conduit 30 . The ascending portion 40 further includes an ascending top surface 40b that is formed to face the ascending bottom surface 40a and rises from the upstream side toward the downstream side.
Next, the highest part 42 (position P4) of the curved water conduit 32 is provided at the downstream end of the rising bottom face 40a of the rising part 40 and has the highest bottom face 42a which is the highest position in the entire bottom surface of the second rim water conduit 28. ing. The ascending portion 40 further includes a highest top surface 42 b that is provided to face the top bottom surface 42 a and that is the highest position on the entire top surface of the second rim water conduit 28 .

Also, the descending portion 44 of the curved water channel 32 is provided downstream of the highest portion 42 and descends from the downstream end of the highest bottom surface 42a to the upstream end 34b of the front water channel 34 (from the upstream side to the downstream side). It has a descending bottom surface 44a. The descending portion 44 further includes a descending top surface 44b that is formed to face the descending bottom surface 44a and descends from the upstream side toward the downstream side.
Here, as shown in FIGS. 6 and 7, in the descending portion 44 of the curved water conduit 32, the descending inclination angle α at which the descending top surface 44b descends with respect to the horizontal plane is It is set to be larger than the downward inclination angle β (α>β).

Next, as shown in FIGS. 3 and 7, the descending portion 44 of the curved water conduit 32 is further provided with a maximum curvature portion 46 having a minimum radius of curvature in plan view on the inner inner peripheral surface 32d.
As a result, the position P4 of the highest portion 42 of the crooked water conduit 32 is located upstream of the position P5 of the maximum curvature portion 46 .

Next, as shown in FIGS. 6 and 7, the front water conduit 34 extends from the downstream end 44c (position P6) of the first descending bottom surface (lowering bottom surface 44a) of the descending portion 44 of the curved water conduit 32 to the second rim discharge. It has a second descending bottom surface (descending bottom surface 48) that gradually descends from the upstream side to the downstream side to the water inlet 22 (position P7).
As a result, the downstream end 48 a of the descending bottom surface 48 of the front water conduit 34 serves as the bottom surface 22 a of the second rim spout 22 .
Further, the descending inclination angle γ at which the descending bottom surface 48 of the front water conduit 34 descends from the upstream side to the downstream side with respect to the horizontal plane is such that the descending bottom surface 44a of the descending portion 44 of the curved water conduit 32 descends with respect to the horizontal plane. It is set to be smaller than the downward inclination angle β (γ<β).
Furthermore, the front water conduit 34 has a top surface 50 formed to face the lower bottom surface 48 above.
Here, the descending inclination angle δ at which the top surface 50 of the front water conduit 34 descends from the upstream side to the downstream side with respect to the horizontal plane is It is set to be smaller than the descending inclination angle α (δ<α).

Next, as shown in FIGS. 6 and 7, the downstream-side neighboring water conduit 52 of the second rim spout 22 has a descending bottom surface 54 which is formed to descend gently in a substantially flat or straight line. It has a rim spout.
In addition, the descending inclination angle ε at which the descending bottom surface 54 of the water conduit 52 near the downstream side of the second rim spout 22 descends from the upstream side to the downstream side with respect to the horizontal plane is The downward inclination angle β at which the descending bottom surface 44a descends with respect to the horizontal plane and the downward inclination angle γ at which the descending bottom surface 48 of the front water conduit 34 descends from the upstream side to the downstream side with respect to the horizontal plane. are set (ε<β, γ).

Next, as shown in FIGS. 6 and 7, in the water conduit 52 near the downstream side of the second rim spout 22, from the second rim spout 22 toward the inner side in the left-right direction (the side of the filth receiving surface 14 and the downstream side). A stepped portion 56 formed in a stepped shape is provided.
Further, the stepped portion 56 has a top surface 56 a that is provided so as to face above the descending bottom surface 54 of the water conduit 52 near the downstream side of the second rim spout 22 .
The top surface 56a of the stepped portion 56 is such that the cross-sectional area of the flow path in the vicinity of the downstream side of the second rim spout 22 extends from the outer side (upstream side) in the left-right direction to the inner side (downstream side) in the left-right direction at the downstream end 56b (position P8). ) is formed in an upwardly concave shape so as to expand toward.
As a result, the stepped portion 56 forms an opening area A2 that is enlarged above the opening area A1 of the second rim spout 22 .

Next, the operation of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG.
According to the flush toilet 1 according to the embodiment of the present invention described above, the bottom surface of the second rim water conduit 28 rises from the first elevated bottom surface 36 of the rear water conduit 30 to the second elevation of the ascending portion 40 of the bent water conduit 32 . It rises to the bottom surface 40 a , and the second rising bottom surface 40 a of the rising portion 40 of this curved water conduit 32 rises to the highest portion 42 .
As a result, the wash water W supplied from the wash water source (water storage tank 10 ) through the main water channel 24 to the second rim water channel 28 flows along the first rising bottom surface 36 of the rear water channel 30 toward the curved water channel 32 . After ascending, it can ascend to the highest portion 42 along the second ascending bottom surface 40 a of the ascending portion 40 of the curved water conduit 32 .
Also, the bottom surface of the second rim water conduit 28 descends from the highest bottom face 42 a of the highest portion 42 of the bent water conduit 32 to the front water conduit 34 via the descending bottom surface 44 a of the descending portion 44 .
As a result, the wash water W reaching the highest portion 42 of the curved water passage 32 from the upstream side flows from the highest bottom surface 42 a of the highest portion 42 of the curved water passage 32 to the front water passage 34 along the descending bottom surface 44 a of the descending portion 44 . After descending, water is spouted rearward into the filth receiving surface 14 of the bowl portion 6 from the second rim spout 22 at the downstream end 34a of the front water conduit 34, thereby forming a swirling flow.
At this time, the wash water W descending from the highest bottom surface 42 a of the curved water channel 32 to the front water channel 34 along the lower bottom surface 44 a of the descending portion 44 descends toward the second rim water outlet 22 . The directional flow vector (flow velocity V) can be increased (see FIG. 6).
As a result, the wash water W spouted from the second rim spout 22 can be easily directed into the rearward bowl portion 6, and the upward splashing of the water can be prevented.
Furthermore, since the highest portion 42 of the curved water conduit 32 of the second rim water conduit 28 can be provided at a position higher than the bowl portion 6, the height position of the second rim spout 22 with respect to the bowl portion 6 is can also be arranged higher.
Therefore, the upper region in the bowl portion 6 can also be sufficiently washed by the wash water spouted rearward into the bowl portion 6 from the second rim spout 22 .

Next, according to the flush toilet 1 according to the present embodiment, from the first rising bottom surface 36 of the rear water conduit 30 of the second rim water conduit 28 along the second rising bottom surface 40a of the rising portion 40 of the curved water conduit 32, The rising wash water W forms a flow that tends to rise due to centrifugal force even when it flows to the highest bottom surface 42 a of the highest portion 42 of the curved water conduit 32 .
As a result, the size and shape of the top surface of the curved waterway 32 have a greater effect on the flow vector (flow velocity V) of the wash water W in the curved waterway 32 than the size and shape of the bottom surface of the curved waterway 32. It will be.
However, when the wash water W flows from the highest bottom surface 42a of the highest portion 42 of the curved water passage 32 along the descending bottom surface 44a of the descending portion 44, the descending top surface 44b of the descending portion 44 of the curved water passage 32 does not move with respect to the horizontal plane. is set to be larger than the downward inclination angle .beta. at which the descending bottom surface a of the descending portion 44 of the curved water conduit 32 descends with respect to the horizontal plane (.alpha.>.beta.).
Therefore, when the wash water W flowing through the highest bottom surface 42 a of the highest portion 42 of the curved water channel 32 descends from the descending portion 44 of the curved water channel 32 to the front water channel 34 , it flows toward the second rim spout 22 . The downward flow vector (flow velocity V) can be increased.
Therefore, the wash water W spouted from the second rim spout 22 can be easily directed into the rearward bowl portion 6, and the upward splashing of the water can be prevented.
Therefore, since the highest portion 42 of the curved water conduit 32 of the second rim water conduit 28 can be provided at a higher position with respect to the bowl section 6, the position of the second rim spout 22 with respect to the bowl section 6 is also Can be placed higher.
As a result, the wash water W spouted rearward into the bowl portion 6 from the second rim spout 22 can sufficiently wash the upper region inside the bowl portion as well.

Further, according to the flush toilet 1 according to the present embodiment, the maximum curvature portion 46 where the radius of curvature in plan view of the inner inner peripheral surface 32d of the curved water conduit 32 is the smallest is It is a place where the direction of flow of the wash water W in the bent waterway 32 is greatly changed.
However, according to the present embodiment, since the position P4 of the highest portion 42 of the curved water conduit 32 is arranged upstream of the position P5 of the maximum curvature portion 46, the maximum curvature portion 46 of the curved water conduit 32 is curved. It will be arranged in the descending portion 44 of the water conduit 32 .
As a result, when the wash water W flowing through the highest bottom surface 42 a of the highest portion 42 of the curved water channel 32 descends from the descending portion 44 of the curved water channel 32 to the front water channel 34 , the water flows downward toward the second rim spout 22 . A large directional flow vector (flow velocity V) can be formed.
Therefore, the wash water W spouted from the second rim spout 22 can be easily directed into the rearward bowl portion 6, and the upward splashing of the water can be prevented.
Therefore, since the highest portion 42 of the curved water conduit 32 of the second rim water conduit 28 can be provided at a higher position with respect to the bowl section 6, the position of the second rim spout 22 with respect to the bowl section 6 is also Can be placed higher.
As a result, the upper region of the bowl portion 6 can also be sufficiently washed by the wash water W spouted rearward into the bowl portion 6 from the second rim spout 22 .

Furthermore, according to the flush toilet 1 according to the present embodiment, the downstream vicinity water conduit 52 of the second rim spout 22, which is the rim spout, is a stepped portion provided near the downstream side of the second rim spout 22. 56. The stepped portion 56 forms an opening area A2 that is expanded upward from the opening area A1 of the second rim spout 22. As shown in FIG.
Therefore, the wash water W spouted from the second rim spout 22 is diverted from the second rim spout 22 to the second rim spout 22 by the stepped portion 56 in the vicinity of the downstream side of the second rim spout 22 . Suppresses the so-called "Coanda effect" in which the flow is drawn from the spout 22 to the top surface 56a of the stepped portion 56, or the flow is maintained along the top surface 56a on the downstream side from the second rim spout 22. can do.
Therefore, it is possible to prevent the wash water W spouted from the second rim spout 22 from jumping upward, so that the wash water W spouted from the second rim spout 22 flows out of the bowl portion 6 to the outside. It is also possible to suppress the occurrence of jumping.

Further, according to the flush toilet 1 according to the present embodiment, the descending bottom surface 54 of the downstream-side neighboring water conduit 52 of the second rim spout 22, which is the rim spouting portion, descends from the upstream side to the downstream side with respect to the horizontal plane. The descending inclination angle ε is the descending inclination angle β at which the descending bottom surface 44a of the descending portion 44 of the curved water conduit 32 descends with respect to the horizontal plane, and the descending inclination angle β at which the descending bottom surface 48 of the front water conduit 34 descends from the upstream side to the downstream side. It is set to be smaller than the downward inclination angle γ that descends with respect to the horizontal plane (ε<β, γ).
Therefore, the wash water W immediately after being spouted from the second rim spout 22 can be temporarily directed to the upper region inside the bowl portion 6 while suppressing water splashing to the outside of the bowl portion 6 .
Therefore, the wash water W spouted from the second rim spout 22 can sufficiently wash the upper region in the bowl portion 6 as well.

In addition, in the flush toilet 1 according to the embodiment of the present invention described above, the water conduit downstream of the main water conduit 24 includes the first rim water conduit 26 including the first rim water outlet 20 and the second rim water conduit 26 . Although the embodiment having two rim water conduits, the second rim water conduit 28 including the water outlet 22, has been described, the present invention is not limited to such a form, and the first rim water conduit 26 including the first rim water outlet 20 is omitted. , a configuration employing only the second rim water conduit including the second rim spout 22 is also applicable.
In addition, in the configuration employing only the second rim water conduit including the second rim spout 22 in this way, the toilet bowl of the flush toilet 1 of the embodiment described above is used as the main water conduit on the upstream side of the second rim water conduit. Instead of the main waterway 24 (central waterway) provided so as to extend in the front-rear direction inside the center in the left-right direction on the rear side of the bowl portion 6 in the main body 2, a rear and center in the left-right direction connected to the water storage tank 10 is provided. A main water channel or the like that extends obliquely forward from the inlet 4a to the upper end of the second rim water channel on one side in the left-right direction of the toilet body may be employed.

REFERENCE SIGNS LIST 1 flush toilet bowl 2 toilet bowl body 4 water conduit 4a water conduit inlet 6 bowl section 8 drain trap section 8a drain trap section inlet 10 water storage tank 12 pot section 14 filth receiving surface 14a bottom edge of filth receiving surface 16 shelf 18 rim Part 20 1st rim spout 22 2nd rim spout (rim spout)
22a bottom surface of second rim spout 24 main waterway 24a front end of main waterway 26 first rim waterway 28 second rim waterway 30 rear waterway 30a inner end of rear waterway, upstream end of rear waterway 30b rear Outer end of water conduit, downstream end of rear water conduit 30c Inner inner peripheral surface of rear water conduit 30d Outer inner peripheral surface of rear water conduit 32 Curved water conduit 32a Back inner end of curved water conduit, upstream of curved water conduit End 32b Outer end of curved waterway 32c Front inner end of curved waterway, downstream end of curved waterway 32d Inner inner peripheral surface of curved waterway 32e Outer inner peripheral surface of curved waterway 34 Forward waterway 34a Forward guide Inner end of waterway, downstream end 34b Outer end of front waterway, upstream end 36 Rising bottom of rear waterway (first rising bottom)
36a Upstream rising bottom of rear waterway (first rising bottom)
36b Downstream rising bottom of rear waterway (first rising bottom)
36c Upstream end of the upstream rising bottom surface of the rear waterway 36d Downstream end of the upstream rising bottom surface of the rear waterway 36e Downstream end of the downstream rising bottom surface of the rear waterway 38 Top surface of the rear waterway 38a Upstream side of the rear waterway Top surface 38b Downstream top surface of rear water conduit 40 Rising portion of curved water channel 40a Rising bottom surface of rising portion of curved water channel (second rising bottom surface)
40b Rising top surface of ascending part of curved waterway 42 Highest part of curved waterway 42a Highest bottom surface of highest part of curved waterway 42b Rising top surface of highest part of curved waterway 44 Descending part of curved waterway 44a Curved waterway descent bottom of the descent part (first descent bottom)
44b Descending top surface of the descending portion of the tortuous waterway 44c Downstream end of the descending bottom surface of the descending portion of the tortuous waterway 46 Maximum curvature portion of the tortuous waterway 48 Descending bottom surface of the forward waterway (second descending bottom surface)
48a Downstream end of the descending bottom surface of the front water channel 50 Top surface of the front water channel 52 Water channel near the downstream side of the second rim spout (rim spout)
54 Descending bottom surface of the water conduit near the downstream side of the second rim spout 56 Stepped portion of the water conduit near the downstream side of the second rim spout 56a Top surface of the stepped portion 56b Downstream end of the top surface of the stepped portion A1 Second rim spout Opening area of water outlet A2 Opening area of stepped portion of headrace near downstream side of second rim spout B Rear area of bowl F Front area of bowl L Left area of bowl LB Left rear area of bowl LF Bowl Left front area of O Center of the bowl part, center of the pot part in the front-rear direction P1 Upstream end position of the rear water channel P2 Downstream end position of the upstream rising bottom surface and upstream top face of the rear water channel P3 Downstream end of the rear water channel Position, upstream end position of ascending part of curved waterway P4 Position of highest part of curved waterway P5 Position of maximum curvature part of descending part of curved waterway P6 Position of downstream end of descending part of curved waterway P7 Downstream end of forward waterway Position, 2nd rim spout position P8 Downstream end of the stepped portion of the water conduit near the downstream side of the 2nd rim spout R Right area of the bowl RB Right rear area of the bowl RF Right front area of the bowl S1 Rear water conduit and curved waterway S2 Boundary plane between curved waterway and forward waterway V Flow velocity of wash water (flow vector of wash water)
W: Wash water X: Horizontal center axis of the bowl Y: Horizontal center axis of the bowl Z: Vertical center axis passing through the center of the bowl β Downward inclination angle at the descending bottom surface (first descending bottom surface) of the descending portion of the bent waterway γ Downward inclination angle at the descending bottom surface (second descending bottom surface) of the forward waterway δ Downward inclination angle at the top surface of the forward waterway ε Descending inclination angle at the descending bottom surface of the waterway near the downstream side of the 2-rim spout

Claims (5)

A flush toilet that is flushed with flush water supplied from a flush water source to discharge waste,
It comprises a bowl-shaped waste receiving surface, a rim portion formed above the waste receiving surface, and a jar portion provided under the waste receiving surface and forming a water storage portion with pooled water. a bowl portion;
a rim conduit provided inside the rim portion on one side with respect to the lateral center axis of the bowl portion for guiding the wash water supplied from the wash water source to the bowl portion side;
a rim water discharge section including a rim water discharge port provided at the downstream end of the rim water conduit and discharging wash water in the rim water conduit from the rim water discharge port into the bowl to form a swirling flow. death,
The rim water conduit includes a rear water conduit provided on the rearward and upstream side, a front water conduit provided on the front and downstream side of the rear water conduit, and a downstream end of the rear water conduit to the rim portion. a bent waterway that extends outward from the rim and then bends toward the inside of the rim and is connected to the upstream end of the front waterway, wherein the rim spout is connected to the front waterway. provided at the downstream end of the water channel and configured to discharge water backward,
The bent waterway has a rising portion that rises in the direction of the flow path, a highest portion that includes a highest bottom surface that is provided downstream of the rising portion and is the highest position in the entire bottom surface of the rim waterway. a descending portion including a descending bottom surface provided on the downstream side of the highest portion and descending from the downstream end of the highest bottom surface to the upstream end of the front water conduit. The descending portion of the curved water conduit further includes a top surface provided above the descending bottom surface, and the top surface includes a descending top surface that descends from the upstream side toward the downstream side, 2. The flush toilet according to claim 1, wherein the descending inclination angle at which the descending top surface descends with respect to the horizontal plane is set to be larger than the descending inclination angle at which the descending bottom surface descends with respect to the horizontal surface. The bent waterway further includes a maximum curvature portion in which the radius of curvature in a plan view of the inner peripheral surface is the minimum, and the highest portion is arranged upstream of the maximum curvature portion. 3. The flush toilet bowl according to 1 or 2. The rim spouting portion further includes a stepped portion provided in the vicinity of the downstream side of the rim spouting port, and the stepped portion forms an opening region that is enlarged upward from the opening region of the rim spouting port. The flush toilet according to any one of claims 1 to 3. The descending bottom surface of the descending portion of the curved water conduit is a first descending bottom surface, and the front water conduit descends from the downstream end of the first descending bottom surface of the descending portion of the curved conduit to the rim spout. including a second descending bottom surface that
The downward inclination angle at which the bottom surface of the rim water discharge portion descends from the upstream side to the downstream side with respect to the horizontal plane is smaller than the downward inclination angle at which the first descending bottom surface or the second descending bottom surface descends relative to the horizontal plane. 5. The flush toilet according to any one of claims 1 to 4, which is set so as to

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