JP7109745B2 - flush toilet - Google Patents

Description

TECHNICAL FIELD 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 to discharge waste.

2. Description of the Related Art Conventionally, as a flush toilet that is washed with cleansing water supplied from a cleansing water source to discharge waste, for example, as described in Patent Document 1, cleansing water is spouted into a bowl to form a swirling flow. It is known that the water discharging portion is arranged in the vicinity of a position where the curvature changes from a small curvature to a large curvature in plan view on one side of the bowl portion centering on the front-rear direction of the bowl portion.
In such a conventional flush toilet, measures such as provision of an overhang are taken to prevent the swirling flow from popping out in a region (curved portion) where the curvature of the bowl portion abruptly changes.

WO2004/022862

However, in the conventional flush toilet disclosed in Patent Document 1 mentioned above, even when flush water spouted from the water spouting portion swirls along the curved portion, the overhang portion prevents the water from splashing out. Even so, there is a problem that a sudden change in centrifugal force may occur with respect to the washing water.
Therefore, there is a possibility that the swirling efficiency of the washing water may be lowered, and there is a possibility that the bowl portion may not be sufficiently washed.
In particular, in the case of a rim portion in which the depth of the overhang portion in the depth direction is shallow, or in a rim portion having a shape without an overhang portion, such a problem becomes more conspicuous.

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to solve the above-described problems of the prior art. To provide a flush toilet capable of effectively suppressing the occurrence of abrupt changes in centrifugal force and improving the washing efficiency in the bowl part.

In order to achieve the above object, 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 a top surface of the waste receiving surface. a rim portion formed on the edge; a drainage channel connected to the lower part of the bowl portion for discharging waste; A rim water discharge section forming a swirling flow, and a water conduit for supplying wash water supplied from the wash water source to the rim water discharge section. The rim water spouting portion includes a front region on the front side and a rear region on the rear side with respect to a center line extending in the left-right direction, and the rim water spouting portion is located in either one of the left and right sides of the front region of the bowl portion. A rim water passage through which wash water supplied from the water passage flows is formed in the rim portion on the side of the rim, and a rim water outlet is formed at the downstream end of the rim water passage for discharging wash water backward. The rim water passage has an outer portion extending forward from the inlet portion through the inside of the rim portion, a bent portion bent inward from the downstream end of the outer portion, and a bent portion extending rearward from the bent portion. an inner portion extending to the rim spout, wherein the height dimension of the flow passage cross section of the inner portion of the rim water passage is the height dimension of the flow passage cross section of the inner portion of the rim water passage ( h) is set to be smaller than the height dimension (H) of the cross section of the flow path of the outer portion .
In the present invention configured as described above, the rim water spouting portion which is provided in the rim portion of the bowl portion and spouts cleansing water into the bowl portion to form a swirling flow is located on either the left or right side of the front region of the bowl portion. A rim water passage through which wash water supplied from the water passage flows is formed in the rim portion on one side, and a rim water outlet is formed in the downstream end of the rim water passage for discharging wash water backward. The rim water passage has an outer portion that extends forward from the inlet portion through the interior of the rim portion, a curved portion that bends inward from the downstream end of the outer portion, and a rim discharge that extends rearward from the curved portion. and the inner portion extending to the water inlet, the volume space of the entire rim water passage can be reduced, so that when the wash water is supplied from the water conduit into the rim water passage, The inner volume space can be quickly filled with flushing water.
Therefore, it is possible to reduce the air space other than the cleansing water in the rim water passage during water flow, and the rim water spouting from the rim water spouting port can be performed efficiently.
In addition, it is possible to make it difficult for the occurrence of abnormal noise due to entrainment of air in the rim water passage when water is passed.
Furthermore, compared to the case where the water outlet of the rim portion on the other side in the left-right direction of the bowl portion is formed along the circumferential shape of the rim portion through the rim portion near the front end portion of the bowl portion, the front end of the bowl portion It is possible to ensure the degree of freedom in designing the toilet bowl regarding the shape of the rim portion near the portion.
In addition, since the height dimension (h) of the cross section of the inner portion of the rim water passage is set to be smaller than the height dimension (H) of the cross section of the outer portion of the rim water passage, For example, in order to reduce the frictional resistance of the wall surface in the rim waterway, the cross section of the rim waterway is almost the same circular cross section or the aspect ratio is almost the same throughout the entire area from the upstream end to the downstream end of the rim waterway. Compared to the rim water passage formed with the same cross section, the size such as the width of the entire rim portion required for the rim water discharge portion can be effectively set smaller.
Therefore, it is possible to reduce the air space other than the cleansing water in the rim water passage when the water is flowing, so that the rim water spouting can be performed more efficiently.
In addition, it is possible to make it difficult for the occurrence of abnormal noise due to entrainment of air in the rim water passage when water is passed.
Furthermore, compared to the case where the water outlet of the rim portion on the other side in the left-right direction of the bowl portion is formed along the circumferential shape of the rim portion through the rim portion near the front end portion of the bowl portion, the front end of the bowl portion It is possible to ensure the degree of freedom in designing the toilet bowl regarding the shape of the rim portion near the portion.

In the present invention, preferably , the ratio (h:H) between the height dimension (h) of the flow channel cross section of the inner portion and the height dimension (H) of the flow channel cross section at the downstream end of the outer portion is It is set to 1:2 to 1:8 .
In the present invention configured as described above, the ratio ( h:H) is set to 1:2 to 1:8. Compared to a rim water passage formed with a substantially identical circular cross section or a cross section with substantially the same aspect ratio over the entire area from the upstream end to the downstream end, the size of the entire rim portion, such as the width, required for the rim water discharge portion is larger. can be effectively set small.
Therefore, it is possible to reduce the air space other than the cleansing water in the rim water passage when the water is flowing, so that the rim water spouting can be performed more efficiently.
In addition, it is possible to make it difficult for the occurrence of abnormal noise due to entrainment of air in the rim water passage when water is passed.
Furthermore, compared to the case where the water outlet of the rim portion on the other side in the left-right direction of the bowl portion is formed along the circumferential shape of the rim portion through the rim portion near the front end portion of the bowl portion, the front end of the bowl portion It is possible to ensure the degree of freedom in designing the toilet bowl regarding the shape of the rim portion near the portion.

According to the flush toilet bowl of the present invention, when the flush water spouted from the spout of the rim spout portion turns along the bend, the flush water undergoes an abrupt change in centrifugal force. can be effectively suppressed, and the cleaning efficiency in the bowl portion can be improved.

1 is a perspective view showing a flush toilet according to an embodiment of the present invention, showing a state in which the toilet lid and toilet seat are rotated to upper positions; FIG. FIG. 4 is a left-right cross-sectional view of the flush toilet according to the embodiment of the present invention, showing the central cross-section in the left-right direction, showing a state in which the toilet lid and the toilet seat are rotated to the lower position; FIG. 2 is a partial plan view showing a toilet body portion of the flush toilet according to the embodiment of the present invention shown in FIG. 1; FIG. 4 is a partially enlarged plan view enlarging a portion of a rim water passage formed inside a rim portion of the toilet body portion of the flush toilet according to the embodiment of the present invention shown in FIG. 3 ; 5 is a partially enlarged cross-sectional view of the rim portion taken along line VV of FIG. 4; FIG. 5 is an A cross section of the rim water passage shown in FIG. 4; 5 is a B cross section of the rim water passage shown in FIG. 4. FIG. 5 is a C cross section of the rim water passage shown in FIG. 4; 5 is a D cross section of the rim water passage shown in FIG. 4; 5 is an E section of the rim water passage shown in FIG. 4; FIG. 3 is a partially enlarged side surface portion obtained by enlarging the portion of the water passage in the vicinity of the downstream side of the rim spout in the flush toilet according to the embodiment of the present invention shown in FIG. 2 ; FIG. FIG. 8 is a cross-sectional view along line VIII-VII of FIG. 7; FIG. 8 is a cross-sectional view along line XI-XI of FIG. 7; The relationship between the distance (x) in the circumferential direction downstream from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to one embodiment of the present invention and the height dimension (U) of the overhang is It is the figure shown qualitatively. Circumferential downstream distance (x) from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to one embodiment of the present invention and maximum height dimension from the shelf surface to the lower end of the overhang It is the figure which showed qualitatively the relationship with (L). The distance (x) in the circumferential direction downstream from the rim spout and the width (W) of the water passage on the downstream side of the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to one embodiment of the present invention. is a diagram qualitatively showing the relationship between . 4 is a cross-sectional view taken along line XI-XI of FIG. 3; FIG. 4 is a cross-sectional view along line XII-XII in FIG. 3; FIG. In the flush toilet according to one embodiment of the present invention, the distance (x) and the curvature (1/ρ) of the downstream side in the circumferential direction from the rim spout when the straight portion and the curved portion of the bowl portion are connected by a transition curve. is a diagram qualitatively showing changes in . This is a comparative example for the flush toilet according to the embodiment of the present invention shown in FIG. It is the figure which showed qualitatively the change of distance (x) and curvature (1/(rho)).

Next, a flush toilet according to an embodiment of the present invention will be described with reference to FIGS. 1 to 13. FIG.
First, FIG. 1 is a perspective view showing a flush toilet according to an embodiment of the present invention, showing a state in which the toilet lid and toilet seat are rotated to the upper position. FIG. 2 is a cross-sectional view of the horizontal center cross-section of the flush toilet according to the embodiment of the present invention, viewed from the left, and shows a state in which the toilet lid and the toilet seat are rotated to the lower position. Furthermore, FIG. 3 is a partial plan view showing a toilet body portion of the flush toilet according to the embodiment of the present invention shown in FIG.

As shown in FIGS. 1 to 3, a flush toilet 1 according to an embodiment of the present invention includes a ceramic toilet body 2 and a toilet seat 4 arranged on the upper surface of the toilet body 2 so as to be vertically rotatable. , a toilet lid 6 arranged so as to be vertically rotatable so as to cover the toilet seat 4, and a functional part 8 arranged behind the toilet body 2. - 特許庁
Further, as shown in FIG. 2, the functional part 8 includes a sanitary washing system functional part 10 which is arranged in the rear upper part of the toilet body 2 and functions as a sanitary washing part for washing the private parts of the user, and the sanitary washing system. A water supply system function part 12 is arranged close to the function part 10 and participates in the function of supplying water to the toilet body 2 .

Next, as shown in FIGS. 1 to 3, the toilet body 2 has a bowl-shaped waste receiving surface 14 and a rim portion 18 formed to rise from a shelf surface 16 at the upper edge of the waste receiving surface 14. and a bowl portion 20 having a
Further, as shown in FIG. 2, the toilet body 2 is provided with a drain trap pipe line 22, which is a drain line for discharging waste in the bowl portion 20, with an inlet portion 22a connected to the lower portion of the bowl portion 20. .

Next, as shown in FIG. 3, the bowl portion 20 has a front region F1 on the front side and a rear region R1 on the rear side with respect to a center line C1 that bisects in the front-rear direction and extends in the left-right direction. The rim portion 18 on one of the left and right sides in the front region F1 of the bowl portion 20, that is, the right rim portion 18 in the front region F1 of the bowl portion 20 when viewed from the front of the toilet body 2 A rim water passage 24 (details of which will be described later), which is part of the rim water spouting portion, is formed inside.
At the downstream end of the rim water passage 24, a rim spout 26 (details of which will be described later), which is a part of the rim spout portion, is formed.
Further, as shown in FIG. 3, the upstream side of the rim water passage 24 is a water conduit 28 which is a water passage for supplying wash water supplied from a tap (not shown), which is a washing water source, to the rim water passage 24. It is connected. The upstream side of this water conduit 28 is directly connected to a water supply (not shown) that is a source of washing water, and using the water supply pressure of this water supply, washing water is supplied from the water conduit 28 into the rim water passage 24. is guided forward in the rim water passage 24, then bends inward and rearward, and is guided to the rim spout 26 on the downstream side.
The wash water guided to the rim spout 26 is spouted backward (rim spout water), and passes through a water passage 30 (details of which will be described later) formed in the vicinity of the downstream side of the rim spout 26 to the bowl portion. A swirling flow is formed in the bowl portion 20 by swirling inside the bowl portion 20 .
The rim water discharge port 26 is the only water discharge port provided in the rim portion 18 that discharges cleansing water to form a swirling flow in the bowl portion 20 .

In the flush toilet bowl 1 of the present embodiment, the rim water passage 24 and the rim spout 26, which are the rim spouting portion, are located on the right side of the rim within the front region F1 of the bowl portion 20 when viewed from the front of the toilet body 2. Although a configuration in which the rim spout is arranged inside the portion 18 will be described, it is not limited to this configuration. It may be arranged so that rim water is spouted toward the rear.
In short, the rim water passage and the rim spout, which are the rim water spouting portions, are arranged in the rim portion 18 on either the left or the right side in the front region F1 of the bowl portion 20 so that the rim water is spouted rearward. form.
In addition, in the flush toilet bowl 1 of the present embodiment, the rim water passage 24 and the rim water discharge port 26, which are the rim water discharge portion, are formed integrally with the toilet body 2 by processing ceramics. For example, it may be formed separately from the toilet body 2 and attached to the toilet body 2 .

Further, as shown in FIG. 2, a jet spout 32 is formed in the bottom of the bowl portion 20 so as to be directed to the inlet portion 22a of the drain trap pipe line 22. As shown in FIG. As for water spouting from the jet water spouting port 32 (jet water spouting), wash water stored in a water storage tank 34 provided in the water supply system function unit 12 is pressurized by a pressure pump 36 of the water supply system function unit 12. , jet outlet 32 .
The wash water discharged from the jet water spouting port 32 flows from the entrance portion 22a of the drain trap pipe line 22 into the rising pipe line 22b on the rear side of the inlet portion 22a, and then flows through the rising pipe line 22b. The top 22c of the drain trap line 22 is adapted to flow into the downcomer line 22d.

Here, the specific structures of the sanitary washing system function unit 10 and the water supply system function unit 12 are the same as those of the conventional one, so detailed description thereof will be omitted. is provided with a private parts washing device (not shown) including a nozzle device (not shown) for spraying cleansing water toward the user above the bowl portion 20 .
In addition, the sanitary washing system function unit 10 includes a water reservoir (not shown) for storing washing water to be supplied to a private washing device (not shown), A heater (not shown), a ventilation fan (not shown), a deodorizing fan (not shown), a hot air fan (not shown), and a controller that controls the operation of these devices (not shown) and the like are provided.
On the other hand, the water supply channel (not shown) of the water supply system function unit 12 is connected to the water supply source (not shown) on the upstream side thereof, and the water supply channel on the upstream side of the water storage tank (not shown). , is provided with a constant flow valve (not shown), a solenoid valve (not shown), a switching valve (not shown) for switching between water supply to the water storage tank (not shown) and water discharge to the rim spout 26, etc. It is In addition to these functions, the water supply system function unit 12 also includes an opening/closing operation of a solenoid valve (not shown), a switching operation of a switching valve (not shown), and a rotation speed of a pressure pump (not shown). A controller (not shown) or the like for controlling the operation time and the like is provided.

In the flush toilet 1 according to the present embodiment, rim water is spouted from the rim spout 26 using the water supply pressure of the water supply, and jet water spouting from the jet spout 32 is controlled by a pressure pump (not shown). A so-called hybrid flush toilet that supplies flush water in a water storage tank (not shown) will be described, but the present invention is not limited to such a configuration and can be applied to other configurations. That is, as another form, the washing water directly supplied only from the water supply may be switched between rim water spouting from the rim water spouting port 26 and jet water spouting from the jet water spouting port 32 by switching a valve. Alternatively, the washing water in the water storage tank may be switched between rim water spouting from the rim water spouting port 26 and jet water spouting from the jet water spouting port 32 by switching only the pump.

Next, details of the rim water passage 24 and the rim spout 26 of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIGS. 1 to 7. FIG.
FIG. 4 is a partially enlarged plan view enlarging a rim water passage formed inside the rim portion of the flush toilet according to the embodiment of the present invention shown in FIG. 3, and FIG. 5 is a partially enlarged cross-sectional view of the rim along line VV of FIG. 4; FIG.
6A is an A section of the rim water passage shown in FIG. 4, and FIG. 6B is a B section of the rim water passage shown in FIG. 6C is a C section of the rim water passage shown in FIG. 4, and FIG. 6D is a D section of the rim water passage shown in FIG. FIG. 6E is an E section of the rim waterway shown in FIG.

First, as shown in FIG. 4, the rim water passage 24 includes an outer portion 24b extending forward inside the rim portion 18 from an inlet portion 24a connected to the water conduit 28, and an outer portion 24b extending forward from the downstream end of the outer portion 24b. It has a bent portion 24c that bends inward, and an inner portion 24d that extends rearward from the bent portion 24c to the rim spout 26. As shown in FIG.

Also, as shown in FIGS. 5 and 6A to 6E, the maximum height of the flow passage cross section of the outer portion 24b and the bent portion 24c of the rim water passage 24 is H, and the flow passage cross section of the inner portion 24d of the rim water passage 24 is Assuming that the maximum height of the rim water passage 24 is h, the maximum height h1 of each flow passage cross section E of the inner portion 24d of the rim water passage 24 is the maximum height of each of the flow passage cross sections A to C of the outer portion 24b of the rim water passage 24. It is set to be smaller than the height dimensions H1 to H3 and the maximum height dimension H4 of the channel cross section D of the bent portion 24c.
In addition, in the flush toilet 1 of the present embodiment, for example, the maximum height h1 of the flow passage cross section E of the inner portion 24d of the rim water passage 24 and the downstream end (bent portion) of the outer portion 24b of the rim water passage 24 24c upstream end) to the maximum height dimension H4 (h1:H4) of the channel cross section D is preferably set to 1:2 to 1:8, and 1:2 to 1:5 is most preferably set to
As a result, for example, in a flush toilet different from the present invention, in order to reduce the frictional resistance of the wall surface in the rim water passage, the flow passage cross section of the rim water passage extends from the upstream end to the downstream end of the rim water passage. Compared to the rim water passage which is formed with substantially the same circular cross section or a cross section with substantially the same aspect ratio over the entire area, the flush toilet bowl 1 of the present embodiment has the rim water passage 24 as the rim water discharge portion and the rim water discharge port. The size such as the width of the entire rim portion 18 required for 26 can be effectively set small.
Therefore, it is possible to reduce the air space other than the cleansing water in the rim water passage 24 during water passage, and the rim water spouting from the rim water spouting port 26 can be performed efficiently.
In addition, it is possible to make it difficult for the occurrence of abnormal noise due to the entrainment of air in the rim water passage 24 during water passage.
Furthermore, by reducing the volumetric space of the entire rim water passage 24, the space around the rim water passage 24, which bends from the outer portion 24b of the rim water passage 24 to the inner portion 24d via the bent portion 24c, is made more spacious. Therefore, the pressure loss of flush water in the rim water passage 24 can be suppressed, and the degree of freedom in toilet bowl design regarding the shape of the rim portion 18 of the bowl portion 20 can be ensured. .

Next, as shown in FIG. 5, the outer portion 24b of the rim water passage 24 is formed integrally with an outer wall portion 38 on the outer peripheral side of the rim portion 18 and a lower wall integrally formed inward from the lower end of the outer wall portion 38. 40, an inner wall portion 42 which horizontally faces the outer wall portion 38 and whose lower end is adhered to the upper end of the lower wall portion 40, and which is integrally formed at the upper end of the inner wall portion 42 and the outer wall an upper wall portion 44 adhered to the upper end of portion 38;
The bonding surface S1 between the upper end surface of the lower wall portion 40 of the outer portion 24b of the rim water passage 24 and the lower end surface of the inner wall portion 42 forms a substantially horizontal surface. The bonding surface S2 with the side wall portion 44 forms an inclined surface that is inclined with respect to a substantially horizontal plane.
The term "substantially horizontal plane" as used herein means not only a completely horizontal plane, but also horizontal displacement between the upper end surface (adhesive surface) of the lower wall portion 40 and the lower end surface (adhesive surface) of the inner wall portion 42. It also includes roughly horizontal surfaces where
As a result, for example, when manufacturing the flush toilet 1 of the present embodiment, the adhesive surface S1 at the lower end of the inner wall portion 42 is adhered to the adhesive surface S1 at the upper end of the lower wall portion 40 of the rim water passage 24, and at the same time, When bonding the bonding surface S2 of the upper wall portion 44 to the bonding surface S2 at the upper end of the outer wall portion 38 of the rim water passage 24, the bonding surface S1 of the lower wall portion 40 and the bonding surface of the inner wall portion 42 forming a horizontal surface Even if S1 and S1 deviate from each other in the horizontal direction due to a manufacturing error or the like, the bonding surface S1 of the outer wall portion 38 and the bonding surface S1 of the upper wall portion 44 forming inclined surfaces that are mutually inclined with respect to the horizontal plane. , can be reliably contacted in advance.
Therefore, the cross sections A to E of the rim water passage 24 from the outer portion 24b to the inner portion 24d are completely crushed due to the displacement between the bonding surface S1 of the lower wall portion 40 and the bonding surface S1 of the inner wall portion 42. Since it is possible to prevent the rim water passage 24 from being stored, the water passage area of the rim water passage 24 can be secured over the entire area.

Next, details of the water passage 30 formed in the vicinity of the downstream side of the rim spout 26 of the flush toilet 1 according to one embodiment of the present invention will be described with reference to FIGS. 4 and 7 to 10C.
7 is a partially enlarged side view of the water passage near the downstream side of the rim spout in the flush toilet according to the embodiment of the present invention shown in FIG. 2, and FIG. FIG. 9 is a cross-sectional view taken along line -VII, and FIG. 9 is a cross-sectional view taken along line XI-XI of FIG.
In addition, FIG. 10A shows the distance (x) from the rim spout in the water passage near the downstream side of the rim spout of the flush toilet according to one embodiment of the present invention, and the height dimension of the overhang ( U), and FIG. 10B is a diagram qualitatively showing the relationship between the rim spout of the flush toilet according to one embodiment of the present invention, and FIG. FIG. 10C is a diagram qualitatively showing the relationship between the distance (x) and the maximum height dimension (L) from the shelf surface to the lower end of the overhang, and FIG. 10C is a flush toilet according to one embodiment of the present invention. FIG. 2 is a diagram qualitatively showing the relationship between the distance (x) in the circumferential direction downstream from the rim spout in the water passage near the downstream side of the rim spout and the width (W) of the water passage on the downstream side of the rim spout; be.

First, as shown in FIGS. 7 to 9, a water passage is formed from the downstream end of the rim spout 26 to the bent portion 50 (details of which will be described later) of the bowl portion 20, that is, near the downstream side of the rim spout 26. 30 is formed by an inner peripheral surface 46 of the rim portion 18, a shelf surface 16 formed below the inner peripheral surface 46 of the rim portion 18, and an overhang portion 48 formed above the inner peripheral surface 46. A channel section G is formed.
In the entire circumference of the rim portion 18, an overhang shape is formed only in the water passage 30, and the inner peripheral surface of the rim portion 18 excluding the water passage 30 is straight in the vertical direction in a cross section cut in the vertical direction. and does not have an overhang shape like the overhang portion 48 .
Further, as shown in FIGS. 4 and 7 to 10C, the water passage 30 has a flow passage cross section G such that the cross-sectional area A0 of the flow passage cross section G is substantially constant from the rim spout 26 toward the downstream side. , the maximum height dimension L is set larger toward the downstream side, and the width W is set smaller toward the downstream side.
That is, for example, the minimum vertical thickness U2 of the overhang portion 48 of the water conduit 30 shown in FIG. It is smaller than the minimum vertical thickness U1 of the overhang portion 48 .

Further, regarding the maximum vertical height dimension L2 of the water conduit 30 of the flow channel cross section G2 shown in FIG. It is larger than the maximum height dimension L1 in the vertical direction of the flow passage cross section G1.
Here, "substantially constant cross-sectional area A0" means not only that the cross-sectional area A0 is completely constant, but also that the cross-sectional area G of the water passage 30 on the downstream side of the rim spout 26 after being spouted from the rim spout 26 is passed. The rim spout water can flow downstream along the water passage 30 with turbulence suppressed, and can effectively form a stable swirling flow in the bowl portion 20 on the downstream side. It is a thing.
Further, regarding the width W2 of the water conduit 30 of the flow channel cross section G2 shown in FIG. 9, the water conduit of the flow channel cross section G1 shown in FIG. It is smaller than the width W1 of 30.
Furthermore, as shown in FIGS. 8 and 9, the height position P1 of the shelf surface 16 forming the flow channel cross section G of the water conduit 30 is substantially constant from the rim spout 26 toward the downstream side. is formed to be
Here, the "substantially constant height position" means not only a completely constant height, but also a flow passage cross section G of the water passage 30 on the downstream side of the rim spout 26 after water is spouted from the rim spout 26. The rim spout water can flow downstream along the water passage 30 while being restrained from being disturbed, and can effectively form a stable swirl flow in the bowl portion 20 on the downstream side. includes.

As a result, the rim spout water that passes through the flow passage cross section G of the water passage 30 after being spouted from the rim spout 26 can be prevented from being disturbed and flow downstream along the water passage 30. A stable swirling flow can be effectively formed in the bowl portion 20 on the side.
Furthermore, by forming a stable flow downstream of the wash water spouted from the rim spout 26 along the water passage 30 on the downstream side, splashing of the wash water can be prevented. The visibility and cleanability of 20 can be effectively improved.

In addition, as shown in FIGS. 8 and 9, the minimum vertical thickness U of the overhang portion 48, which is the minimum height dimension of the overhang portion 48 in the flow passage cross section G of the water conduit 30, and The ratio (U:L) to the maximum vertical height L of the water passage 30, which is the maximum height up to the lower end of the hang portion 48, is preferably set to 1:6 to 6:1. Most preferably, it is set to 1:3 to 3:1.

In addition, as shown in FIG. 3, the inner peripheral wall of the rim portion 18 formed in the right rear area in the bowl portion 20 and downstream of the water passage 30 extends from the rim spout 26 to the downstream side in the circumferential direction. A curved portion 50 is formed in which the curvature (1/ρ) changes from small to large (in other words, the curvature radius ρ changes from large to small) according to the distance (x). That is, the curved portion 50 has a curvature (1/ρ) that changes from small to large at a constant ratio in plan view shown in FIG. ) is formed by a relaxation curve 52 such as a clothoid curve.
Similarly, as shown in FIG. 3 , the inner peripheral wall of the rim portion 18 in the front side area of the bowl portion 20 also has a diameter corresponding to the distance (x) from the rim spout 26 toward the downstream side in the circumferential direction. A curved portion 54 is formed in which the curvature (1/ρ) changes from small to large (in other words, the curvature radius ρ changes from large to small) from the left rear side to the front. The curved portion 54 has a curvature (1/ρ) that changes at a constant ratio from small to large (in other words, the curvature radius ρ changes at a constant ratio from large to small) in plan view shown in FIG. It is formed by a relaxation curve 56 such as a curve.
As a result, when the cleansing water spouted from the rim spout 26 first swirls along the bend 50, it is possible to effectively suppress a sudden change in centrifugal force on the cleansing water. , and the cleaning efficiency in the bowl portion 20 can be improved.
Further, the wash water swirling along the curved portion 50 passes through the rear region of the bowl portion 20 along the inner peripheral wall of the rim portion 18 and swirls downstream in the circumferential direction, and then flows along the curved portion 54. It is designed to turn in the front side area in the bowl portion 20, and when turning in this curved portion 54, it is possible to effectively suppress the rapid change in centrifugal force on the washing water. , and the cleaning efficiency in the bowl portion 20 can be improved.
In the flush toilet bowl 1 of the present embodiment, the transition curves 52 and 56 of the curved portions 50 and 54 formed by the inner peripheral wall of the rim portion 18 employ clothoid curves in which the curvature changes at a constant rate. However, as the transition curve, a sine half-wave reduction curve or the like, which is a transition curve other than the clothoid curve, may be employed.

Next, with reference to FIGS. 3 and 11 to 13B, bends 50 and 54 formed by transition curves 52 and 56 in plan view in the bowl portion 20 of the flush toilet 1 according to one embodiment of the present invention. Details will be explained.
Here, FIG. 11 is a cross-sectional view along line XI-XI in FIG. 3, and FIG. 12 is a cross-sectional view along line XII-XII in FIG.
Also, FIG. 13A shows the distance (x) on the downstream side in the circumferential direction from the rim spout when the straight portion and the curved portion of the bowl portion are connected by a transition curve in the flush toilet according to the embodiment of the present invention. FIG. 13B is a diagram qualitatively showing changes in curvature (1/ρ), and FIG. 13B is a comparative example for the flush toilet according to the embodiment of the present invention shown in FIG. is a diagram qualitatively showing changes in the distance (x) and the curvature (1/ρ) on the downstream side in the circumferential direction from the rim spout when connecting with a curve that is tangent to the straight line.

First, as shown in FIGS. 3, 11 and 12, the bowl portion 20 forms the shelf surface 16 at the bent portions 50 and 54 formed by the transition curves 52 and 56, and the width W3 of the shelf surface 16 is is substantially constant along the circumferential direction of the bowl portion 20 .
The term "substantially constant" as used herein means not only a completely constant state, but also when the wash water spouted from the rim spout 26 of the rim water passage 24 turns along the shelf surface 16 of the bends 50 and 54. In addition, it also includes approximately constant, which can more effectively suppress the occurrence of abrupt changes in centrifugal force on the wash water.
Further, as shown in FIGS. 11 and 12, the shelf surfaces 16 of the bends 50 and 54 formed by the transition curves 52 and 56 of the bowl portion 20 are inclined with respect to the horizontal plane at angles α1 and α2, respectively. formed.
Here, the magnitude of the inclination angle α1 is preferably set between 0° and 15°, most preferably between 2° and 8°.
The tilt angle α2 is set larger than the tilt angle α1, preferably 3° to 60°, most preferably 5° to 30°. .
As a result, when the cleansing water spouted from the rim spout 26 swirls along the shelf surface 16 of the bends 50 and 54, it is possible to more effectively prevent the abrupt change in centrifugal force on the cleansing water. , the efficiency of cleaning the interior of the bowl portion 20 can be improved.

Further, as shown in FIG. 13A, in the flush toilet 1 of the present embodiment, when the substantially straight straight portion and the curved portion of the bowl portion 20 are connected by a transition curve, the flow from the rim spout 26 In the section where the distance x on the downstream side in the circumferential direction is from 0 to x1 (for example, x1 = 50 mm), the curvature 1/ρ is constant a (for example, ρ1 = 800 mm, a = 1 / ρ1 = 0.00125 [1/ mm]), which is a section that forms a straight portion that is substantially straight.
Next, as shown in FIG. 13A, in the section where the distance x is from x1 to x2 (eg, x2 = 200 mm), the curvature 1/ρ is between a and b (eg, ρ1 = 800 mm, a = 1/ρ1 = 0 .00125, ρ2=150 mm, b=1/ρ2=0.00667 [1/mm]).
Also, as shown in FIG. 13A, in the section where the distance x is from x2 to x3 (for example, x3=380 mm), the curvature 1/ρ2 is constant b (for example, ρ2=150 mm, b=1/ρ2=0. 00667 [1/mm]), which is a section forming a curved portion with a substantially constant curvature.

On the other hand, as shown in FIG. 13B, in the comparative example in which the straight portion and the curved portion of the bowl portion are connected by a curve that is tangent to the straight line, the curvature 1/ρ is 0 (curvature (radius ρ = ∞) to c (curvature radius ρ = ρ3), when the wash water spouted from the rim spout swirls along the shelf surface of the curved portion, A sudden change in centrifugal force will occur more than in the flush toilet 1 of the present embodiment, and the cleaning efficiency inside the bowl will be lowered.

Next, the operation of the flush toilet 1 according to the embodiment of the present invention described above will be described.
First, according to the flush toilet bowl 1 according to the embodiment of the present invention, the flow path on the downstream side of the rim spout 26 is at least the region on the right rear side in the bowl portion 20 of the inner peripheral wall of the rim portion 18 and the bowl The curvature changes from small to large at bends 50 and 54 formed at positions closest to the rim spout 26 in the region on the front side of the portion 20, and these bends 50 and 54 form a transition curve 52 in plan view. , 56, when the wash water spouted from the rim spout 26 swirls along the bends 50, 54, the abrupt change in centrifugal force on the wash water is prevented. can be effectively suppressed. Therefore, the cleaning efficiency inside the bowl portion 20 can be improved.

Next, according to the flush toilet 1 according to the present embodiment, the shelf surface 16 is formed at the bent portions 50 and 54 formed by the transition curves 52 and 56 of the bowl portion 20, and the width W3 of the shelf surface 16 is the width of the bowl. Since it is substantially constant along the circumferential direction of the portion 20, when the wash water spouted from the rim spout 26 swirls along the shelf surface 16 of the curved portions 50 and 54, there is a sudden change in the wash water. It is possible to more effectively suppress the occurrence of changes in centrifugal force. Therefore, the cleaning efficiency inside the bowl portion 20 can be improved.

Further, according to the flush toilet 1 according to the present embodiment, the shelf surface 16 is formed at the bent portions 50 and 54 formed by the transition curves 52 and 56 of the bowl portion 20, and the shelf surface 16 is 0 with respect to the horizontal plane. .degree. to 60.degree. It is possible to more effectively suppress the occurrence of changes in centrifugal force. Therefore, the cleaning efficiency inside the bowl portion 20 can be improved.

1 Flush toilet bowl 2 Toilet body 4 Toilet seat 6 Toilet lid 8 Functional part 10 Sanitary cleaning system functional part 12 Water supply system functional part 14 Dirt receiving surface 16 Shelf surface 18 Rim part 20 Bowl part 22 Drainage trap pipe (drainage channel)
22a inlet portion 22b ascending pipeline 22c top portion 22d descending pipeline 24 rim water passage (rim water discharge portion)
24a Inlet portion of rim water channel 24b Outer portion of rim water channel 24c Bent portion of rim water channel 24d Inner portion of rim water channel 26 Rim water outlet (rim water outlet)
28 Conduit (conduit)
30 Water channel in the vicinity of the downstream side of the rim spout 32 Jet spout 34 Water storage tank 36 Pressure pump 38 Outer wall portion of the outer portion of the rim water channel 40 Lower wall portion of the outer portion of the rim water channel 42 Outside the rim water channel 44 Upper wall portion of the outer portion of the rim water passage 46 Inner peripheral surface of the rim portion 48 Overhang portion 50 Curved portion 52 Transition curve 54 Curved portion 56 Transition curve A Cross section of the outer portion of the rim water passage A0 Cross-sectional area of the flow channel in the vicinity of the downstream side of the rim spout B Flow channel cross-section of the outer part of the rim water channel C Cross-section of the outer part of the rim water channel C1 Bisection of the bowl in the front-rear direction D Channel cross section of the curved portion of the rim water channel E Channel cross section of the inner part of the rim water channel E1 Opening cross section of the rim spout F1 Front area of the bowl G Downstream side of the rim spout Flow cross section of nearby water channel H Maximum height dimension of flow channel cross section of outside part and curved part of rim water channel H1 Maximum height dimension of flow channel cross section A of outside part of rim water channel H2 Outside of rim water channel Maximum height of channel cross section B in the outer part of the rim channel H3 Maximum height of channel cross section C in the outer part of the rim channel Maximum height dimension of inner channel cross section h1 Maximum height dimension of inner channel cross section E of rim water channel L Maximum height dimension of water channel near downstream side of rim spout (shelf surface of water channel to the bottom edge of the overhang)
L1 Maximum height dimension of the water channel near the downstream side of the rim spout (maximum height dimension from the shelf surface of the water channel to the bottom end of the overhang)
L2 Maximum height dimension of the water channel near the downstream side of the rim spout (maximum height dimension from the shelf surface of the water channel to the bottom end of the overhang)
P1 Height position of the shelf surface of the water channel in the vicinity of the downstream side of the rim spout R1 Rear side area of the bowl S1 Adhesion surface between the upper end surface of the lower wall portion of the outer portion of the rim water channel and the lower end surface of the inner wall portion S2 Adhesive surface between the upper end surface of the outer wall of the outer part of the rim water passage and the upper wall U Minimum vertical thickness of the overhang (minimum height dimension of the overhang)
U1 Minimum vertical thickness of overhang (minimum height of overhang)
U2 Minimum vertical thickness of overhang (minimum height dimension of overhang)
W Width of water passage near downstream side of rim spout W1 Width of water passage near downstream side of rim spout W2 Width of water passage near downstream side of rim spout W3 Width of shelf x Width from rim spout Circumferential downstream distance x1 Circumferential downstream distance from rim spout x2 Circumferential downstream distance from rim spout x3 Circumferential downstream distance from rim spout α1 Inclination angle of shelf α2 Shelf Surface inclination angle ρ Curvature radius of transition curve ρ1 Curvature radius of transition curve ρ2 Curvature radius of transition curve ρ3 Curvature radius

Claims (2)

A flush toilet that is flushed with flush water supplied from a flush water source to discharge waste,
a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed on the upper edge of the waste receiving surface;
a drainage channel connected to the lower part of the bowl portion for discharging waste;
a rim water spouting portion provided in the rim portion for spouting cleansing water into the bowl portion to form a swirling flow;
a water conduit for supplying wash water supplied from the wash water source to the rim water discharge section;
The bowl portion has a front region that is on the front side and a rear region that is on the rear side with respect to a center line that bisects the bowl portion in the front-rear direction and extends in the left-right direction,
The rim water discharge portion forms a rim water passage through which wash water supplied from the water passage flows to the rim portion on either one of the left and right sides in the front region of the bowl portion. forming a rim spout for spouting wash water backward at the downstream end of the water passage,
The rim water passage includes an outer portion extending forward from the inlet portion through the inside of the rim portion, a bent portion bending inward from a downstream end of the outer portion, and the rim extending rearward from the bent portion. an inner portion extending to the spout;
The maximum height dimension (h) of the flow passage cross section of the inner portion of the rim water passage is set to be smaller than the maximum height dimension (H) of the flow passage cross section of the outer portion. Characteristic flush toilet bowl. The ratio (h:H) between the maximum height dimension (h) of the flow channel cross section of the inner portion and the maximum height dimension (H) of the flow channel cross section at the downstream end of the outer portion is 1:2 to 1. : 8. The flush toilet of claim 1, wherein:

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