Wash-down type flush toilet
Patent Information
- Application Number
- JP2024026178
- Authority / Receiving Office
- JP · JP
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2024-02-26
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2042-02-28
Smart Images
Figure 0007936524000001 
Figure 0007936524000002 
Figure 0007936524000003
Abstract
Description
Technical Field
[0001] The present invention relates to a wash-out type flush toilet, and particularly to a wash-out type flush toilet with improved discharge performance for floating waste.
Background Art
[0002] Conventionally, as described in, for example, Patent Documents 1 to 3, wash-out type flush toilets that flush away waste by the flowing water action caused by the drop of water in the bowl portion are known. The wash-out type flush toilet described in Patent Document 1 discharges flushing water from three water discharge ports, and by adjusting the amount of flushing water discharged from each of the water discharge ports, a strong flow is formed in a specific region of the retained water surface (corresponding to a second region S2 described later), whereby excellent bowl portion cleaning performance can be obtained. The wash-out type flush toilet described in Patent Document 2 improves waste discharge performance by discharging flushing water from two water discharge ports and causing the main flow of flushing water with a large swirling force to flow into a first region of the retained water surface (corresponding to a first region S1 and a second region S2 described later). The wash-out type flush toilet described in Patent Document 3 improves waste discharge capability by causing a large amount of flushing water to flow from the second water discharge port from the rear of the retained water surface.
Prior Art Documents
Patent Documents
[0003]
Patent Document 1
Patent Document 2
Patent Document 3
Summary of the Invention
Problems to be Solved by the Invention
[0004] However, in a wash-down type flush toilet, it is conceivable to increase the water surface area compared to conventional models in order to reduce the area of the waste receiving surface, which is the dry surface, and suppress the adhesion of waste. However, in the wash-down type flush toilets described in Patent Documents 1 to 3 above, strong flushing water is directed into a specific area of the water surface. Therefore, if the water surface area is increased, strong flushing water will only be directed into that specific area of the water surface, causing the surface of the water surface to become disturbed. As a result, it has been found that it may not be possible to adequately discharge floating waste suspended on the surface of the water surface.
[0005] The inventors of this invention identified problems arising from the formation of a large water surface in a wash-down type flush toilet, and through diligent research to solve these problems, they were able to realize the present invention.
[0006] This invention was made to solve the aforementioned new problems and aims to provide a wash-down type flush toilet that improves the discharge capacity of floating waste. [Means for solving the problem]
[0007] To achieve the above objective, the present invention provides a wash-down type flush toilet that washes away waste with flushing water, comprising: a bowl portion having a waste receiving surface for receiving waste, a rim portion formed on the upper part of the waste receiving surface, and a pot portion formed on the lower part of the waste receiving surface with a water reservoir surface formed inside; one or more outlets for discharging flushing water along the rim portion; and a drainage pipe connected to the bottom of the bowl portion, wherein the main stream of flushing water discharged from the outlets is configured to swirl around the waste receiving surface of the bowl portion and flow into three or more regions of the water reservoir surface, which is divided into four regions by a front-to-back center line and a left-to-right center line that divide the water reservoir surface in the front-to-back and left-to-right directions in a plan view, at the initial stage of flushing. In the present invention configured as described above, the main stream of washing water discharged from the spout swirls around the waste receiving surface of the bowl and flows into three or more of the four regions of the water surface, which are divided into front-to-back and left-to-right regions in a plan view, at the beginning of washing. Therefore, according to the present invention, at the beginning of washing, washing water flows into three or more of the four regions of the water surface, which are divided into front-to-back and left-to-right regions, thus enabling faster discharge of floating waste. Furthermore, by applying pressure to the entire surface of the water surface, the water surface is not disturbed, thus improving the discharge force of floating waste.
[0008] In the present invention, preferably, the predetermined amount of energy accumulated in the washing water flowing into the water surface is configured to reach three or more regions of the water surface, which is divided into four regions, within one second. In the present invention configured in this way, a predetermined amount of energy stored in the washing water flowing into the reservoir reaches three or more of the four regions of the reservoir within one second. This makes it possible to keep the pressing pressure on the reservoir constant, thereby suppressing turbulence on the reservoir surface while discharging suspended waste.
[0009] In the present invention, preferably, the main stream of washing water forms a forward stream that swirls around the front side of the waste receiving surface of the bowl, and a rear stream that swirls around the rear side of the waste receiving surface of the bowl. In the present invention configured in this way, by forming a forward main stream and a rear main stream of washing water, it is possible to clean the entire waste receiving surface of the bowl while improving the discharge performance of floating waste.
[0010] In the present invention, preferably, the forward and backward main streams of the washing water are configured to flow into the upper reservoir water surface without merging. In the present invention configured in this way, the forward and backward main streams of the washing water flow into the reservoir surface without merging, making it easier to keep the energy of the washing water flowing into three or more regions constant. This suppresses turbulence on the reservoir surface while enabling the discharge of suspended solid waste.
[0011] In the present invention, preferably, the forward and backward main streams of the washing water are configured to flow into different regions of a region divided into four areas. In the present invention configured in this way, the forward and backward main streams of the washing water flow into different regions of the boundary area, which is divided into four regions, that is, they do not flow into the same region. This makes it easier to keep the pressure on the water surface constant and to suppress turbulence on the water surface.
[0012] In the present invention, preferably, the spouts consist of a first spout that forms a forward main flow and a second spout that forms a rear main flow. The first spout is formed on either the left or right side of the front area of the waste receiving surface of the bowl surface, and the second spout is formed on the other side of the rear area of the waste receiving surface of the bowl surface. The forward main flow mainly flows into the rear area on either the left or right side of the water surface, which is divided into four areas, where the first spout is not provided. The rear main flow mainly flows into the front area on either the left or right side of the water surface, which is divided into four areas, where the second spout is not provided. In the present invention configured in this way, the washing water discharged from the first and second outlets flows into the area on the side where the outlets are not provided, so the washing water flows into the water reservoir without swirling around the bowl surface, thus allowing the washing water to flow into the water reservoir more quickly. [Effects of the Invention]
[0013] The wash-down type flush toilet of the present invention can improve the discharge capacity of floating waste. [Brief explanation of the drawing]
[0014] [Figure 1] This is a plan cross-sectional view of a wash-down type flush toilet according to the first embodiment of the present invention. [Figure 2] This is a longitudinal cross-sectional view along line II-II in Figure 1. [Figure 3]It is a plan view showing a first region S1, a second region S2, a third region S3, and a fourth region S4 of the water flow surface of a wash-out type flush toilet according to the first embodiment of the present invention. [Figure 4A] It is a schematic plan view of a first example showing the arrangement of the first water discharge port and the second water discharge port in the bowl portion of the wash-out type flush toilet according to the first embodiment of the present invention. [Figure 4B] It is a schematic plan view of a second example showing the arrangement of the first water discharge port and the second water discharge port in the bowl portion of the wash-out type flush toilet according to the first embodiment of the present invention. [Figure 4C] It is a schematic plan view of a third example showing the arrangement of the first water discharge port and the second water discharge port in the bowl portion of the wash-out type flush toilet according to the first embodiment of the present invention. [Figure 4D] It is a schematic plan view of a fourth example showing the arrangement of the first water discharge port and the second water discharge port in the bowl portion of the wash-out type flush toilet according to the first embodiment of the present invention. [Figure 5] It is a diagram showing the kinetic energy (instantaneous value) when flush water discharged from the water discharge port of the wash-out type flush toilet according to the first embodiment of the present invention flows into each region of the water reservoir surface. [Figure 6A] It is a diagram showing the kinetic energy (accumulated amount) when flush water discharged from the water discharge port of the wash-out type flush toilet according to the first embodiment of the present invention flows into each region of the water flow surface. [Figure 6B] It is a diagram showing the kinetic energy (accumulated amount) when flush water discharged from the water discharge port of the wash-out type flush toilet according to the comparative example of the first embodiment of the present invention flows into each region of the water flow surface. [Figure 7] It is a plan view of the bowl portion showing the state in which flush water discharged from the first water discharge port and the second water discharge port flows into the water reservoir surface in the wash-out type flush toilet according to the first embodiment of the present invention. [Figure 8] It is a perspective cross-sectional view of the wash-out type flush toilet according to the second embodiment of the present invention as viewed obliquely from above. [Figure 9] It is a partially enlarged vertical cross-sectional view of Figure 2. [Figure 10] It is a partially enlarged plan cross-sectional view of Figure 1. [Figure 11] This is a cross-sectional view along the line XI-XI in Figure 2. [Figure 12] This is a cross-sectional view along the line XII-XII in Figure 2. [Figure 13] This is a perspective cross-sectional view showing the flow of the main stream of flushing water discharged from the spout of a wash-down type flush toilet according to a second embodiment of the present invention. [Figure 14] This is a perspective cross-sectional view showing the forward flow of the main stream of flushing water discharged from the spout of a wash-down type flush toilet according to a second embodiment of the present invention. [Figure 15] This is a plan cross-sectional view of a wash-down type flush toilet according to a third embodiment of the present invention. [Figure 16] This is a conceptual plan view showing the position of the water outlet (rim water outlet) and the flow of flushing water in a wash-down type flush toilet according to a third embodiment of the present invention. [Figure 17A] This is a conceptual plan view showing the position of the water outlet (rim outlet) and the flow of flushing water in a conventional flush toilet according to Example 1. [Figure 17B] This is a conceptual plan view showing the position of the water outlet (rim outlet) and the flow of flushing water in a conventional flush toilet according to Example 2. [Modes for carrying out the invention]
[0015] The following describes a wash-down type flush toilet according to the first embodiment of the present invention. First, the basic structure of the wash-down type flush toilet will be explained with reference to Figures 1 and 2. Figure 1 is a plan cross-sectional view of the wash-down type flush toilet according to the first embodiment of the present invention, and Figure 2 is a longitudinal cross-sectional view taken along line II-II in Figure 1. In the following description, the wash-down type flush toilet will be simply referred to as a "flush toilet".
[0016] As shown in Figures 1 and 2, the flush toilet 1 is a wash-down type toilet that uses the flow of water caused by the difference in water level within the bowl to wash away waste. The flush toilet 1 comprises a ceramic toilet body 2 and a water storage tank 4 that stores the water used to wash the toilet body 2. The toilet body 2 has a bowl 6 on the front side, and a common water passage 8 is formed at the rear upper part, with an opening 7 at its upstream end that communicates with the water storage tank 4. Furthermore, a drainage pipe 10 for discharging waste is formed at the rear lower part of the bowl 6. In this specification, the front side of the flush toilet bowl is described as the front, the back side as the rear, the right side as the right side, and the left side as the left side, from the user's perspective.
[0017] The aforementioned water storage tank 4 is equipped with a drain valve 12, and when the user opens an operating lever (not shown), the drain valve 12 opens, and the flushing water in the water storage tank 4 is supplied to the toilet bowl body 2. In this embodiment, in addition to the water storage tank 4, a direct-pressure tap water system or a flush valve may be used as the water source for washing water, and a pump may also be used to supply the washing water.
[0018] The bowl section 6 comprises a bowl-shaped waste receiving surface 16, a rim section 18 formed above the waste receiving surface 16, and a pot section 22 formed below the waste receiving surface 16, which forms a water reservoir 20 inside. Here, the water reservoir 20 of the pot section 22 is roughly triangular, measuring 160mm to 180mm in the front-to-back direction and 125mm to 145mm in the width direction when viewed from above, and is larger (enlarged) than the water reservoir of conventional flush toilets. Furthermore, the pot section 22 measures 20cm to 24cm in the front-to-back direction and 15cm to 19cm in the width direction when viewed from above, forming a roughly triangular shape that is more egg-shaped (elliptical with a tapered front) than the water reservoir 20.
[0019] The rim portion 18 of the bowl portion 6 has a first outlet 24 for discharging cleaning water on the front left side when viewed from the front, and a second outlet 26 for discharging cleaning water on the rear right side when viewed from the front. The common water channel 8 described above branches downstream into a first water channel 28 and a second water channel 30. The first water channel 28 extends to the first outlet 24, and the second water channel 30 extends to the second outlet 26, supplying cleaning water from the water storage tank 4 to the first outlet 24 and the second outlet 26. Here, the first outlet 24 and the second outlet 26 discharge cleaning water in a direction that forms a swirling flow that rotates in the same direction. In this embodiment, a counterclockwise swirling flow is formed. In this embodiment, there may be one water outlet, or there may be two or more (for example, three).
[0020] Next, the water surface of the flush toilet according to the first embodiment of the present invention will be described with reference to Figure 3. As shown in Figure 3, for the sake of explanation, the area of the water surface 20 formed inside the pot portion 22 is divided into four regions by a center line A1 extending in the left-right direction (width direction) and a center line A2 extending in the width direction. These four regions will be described. Specifically, the water surface 20 includes a first region S1 on the left rear side, a second region S2 on the right rear side, a third region S3 on the right front side, and a fourth region S4 on the left front side. In this embodiment, the water surface 20 is divided into four regions, but the pot portion 22 may be similarly divided into four regions.
[0021] Next, various arrangements of the water outlets that dispense flushing water will be described with reference to Figures 4A, 4B, 4C, and 4D. Figure 4A is a schematic plan view of the first example showing the arrangement of the first and second water outlets in the bowl of a flush toilet according to the first embodiment of the present invention; Figure 4B is a schematic plan view of the second example showing the arrangement of the first and second water outlets in the bowl of a flush toilet according to the first embodiment of the present invention; Figure 4C is a schematic plan view of the third example showing the arrangement of the first and second water outlets in the bowl of a flush toilet according to the first embodiment of the present invention; and Figure 4D is a schematic plan view of the fourth example showing the arrangement of the first and second water outlets in the bowl of a flush toilet according to the first embodiment of the present invention.
[0022] As shown in Figures 4A to 4D, the bowl portion 6 is divided into four regions in a top view by a center line B1 extending in the left-right direction (width direction) in the front-back direction and a center line B2 extending in the front-back direction in the width direction. In the first example shown in Figure 4A, the first spout 24 is located in the front left area of the bowl 6 and discharges water forward to form a front main stream F1, while the second spout 26 is located in the rear right area of the bowl 6 and discharges water laterally to form a rear main stream F2.
[0023] In the second example shown in Figure 4B, the first outlet 24 is located in the rear left area of the bowl 6 and discharges water forward to form a forward main stream F1, while the second outlet 26 is located in the rear right area of the bowl 6 and discharges water laterally to form a rear main stream F2. In the third example shown in Figure 4C, the first outlet 24 is located in the front left area of the bowl 6 and discharges water forward to form a front main stream F1, while the second outlet 26 is located in the front right area of the bowl 6 and discharges water backward to form a rear main stream F2. In the fourth example shown in Figure 4D, the first outlet 24 is located in the rear left area of the bowl 6 and discharges water forward to form a forward main stream F1, while the second outlet 26 is located in the front right area of the bowl 6 and discharges water backward to form a rear main stream F2.
[0024] In the flush toilet 1 of this embodiment, in the first example shown in Figure 4A, both the front main stream F1 and the rear main stream F2 flow easily into the water surface 20, but in the second example shown in Figure 4B, the front main stream F1 does not flow easily into the water surface 20, in the third example shown in Figure 4C, the rear main stream F2 does not flow easily into the water surface 20, and in the fourth example shown in Figure 4D, both the front main stream F1 and the rear main stream F2 do not flow easily into the water surface 20.
[0025] In the flush toilet 1 of this embodiment, the main streams of flushing water, namely the front stream F1 and the rear stream F2, are configured to flow into three or more of the four regions of the water surface 20 described above at the beginning of flushing, thereby accelerating the timing of the discharge of floating waste. At the same time, by applying pressure to the front surface of the water surface 20, the water surface 20 is not disturbed, and the discharge force of floating waste is improved.
[0026] In the flush toilet 1 according to this embodiment, the following means are employed to achieve the above-mentioned features. Means 1 (when equipped with a first discharge port and a second discharge port) First, as in the first example in Figure 4A and the third example in Figure 4C, if the inflow of the forward main flow F1 of the cleaning water discharged from the first outlet 24 into the reservoir water surface 20 is rapid, (i) an inflow delay means is provided to slow down the inflow of the forward main flow F1 of the cleaning water discharged from the first outlet 24 into the reservoir water surface 20. The inflow delay means may be controlled by controlling the flow velocity of the cleaning water using a pressurizing pump, or by controlling the flow velocity by the shape of the first water channel 28 of the cleaning water, the shape of the first outlet 24, the shape of the waste receiving surface 16, etc. Alternatively, the distance from the first outlet 24 to the reservoir water surface 20 of the forward main flow F1 may be increased.
[0027] Furthermore, if the forward main flow F1 of the cleaning water discharged from the first outlet 24 flows into the reservoir surface 20 quickly, (ii) an inflow-promoting means is provided to accelerate the inflow of the forward main flow F1 of the cleaning water discharged from the second outlet 26 into the reservoir surface 20. The inflow-promoting means may be configured to allow the rear main flow F2 discharged from the second outlet 26 to flow towards the reservoir surface 20, or it may be configured to increase the flow velocity of the rear main flow F2. To achieve this, it is preferable to control the flow velocity of the cleaning water using a pressurizing pump, or to control the flow velocity by the shape of the second water channel 30 of the cleaning water, the shape of the second outlet 26, the shape of the waste receiving surface 16, etc.
[0028] Means 2 (when equipped with a first discharge port and a second discharge port) Next, as in the second example in Figure 4B and the fourth example in Figure 4D, if the inflow of the forward main flow F1 of the cleaning water discharged from the first outlet 24 into the reservoir surface 20 is slow, an inflow promotion means is provided to speed up the inflow of the forward main flow F1 of the cleaning water discharged from the first outlet 24 into the reservoir surface 20. The inflow promotion means may be controlled by a pressurizing pump to control the flow velocity of the cleaning water, or by controlling the flow velocity by the shape of the first water channel 28 of the cleaning water, the shape of the first outlet 24, the shape of the waste receiving surface 16, etc. Alternatively, the distance from the first outlet 24 to the reservoir surface 20 of the forward main flow F1 may be shortened, or the forward main flow F1 may flow into the reservoir surface 20 along the side surface of the pot section 22.
[0029] Means 3 (when equipped with a first discharge port and a second discharge port) Furthermore, as shown in the second example in Figure 4B and the fourth example in Figure 4D, if the inflow of the forward main stream F1 of the cleaning water discharged from the first outlet 24 into the accumulated water surface 20 is slow, an inflow-promoting means is provided to speed up the inflow of the rear main stream F2 of the cleaning water discharged from the second outlet 26 into the accumulated water surface 20. The inflow-promoting means may be controlled by a pressurizing pump to control the flow velocity of the cleaning water, or by controlling the flow velocity through the shape of the second water channel 30, the shape of the second outlet 26, the shape of the waste receiving surface 16, etc. Alternatively, the distance from the second outlet 26 to the accumulated water surface 20 of the rear main stream F2 may be increased.
[0030] Next, the kinetic energy of the flushing water flowing into the water surface in the flush toilet 1 according to this embodiment will be explained with reference to Figures 5, 6A, and 6B. Figure 5 is a diagram showing the instantaneous kinetic energy when the flushing water discharged from the spout of the wash-down type flush toilet according to the first embodiment of the present invention flows into each region of the water surface. Figure 6A is a diagram showing the accumulated kinetic energy when the flushing water discharged from the spout of the wash-down type flush toilet according to the first embodiment of the present invention flows into each region of the flow surface. Figure 6B is a diagram showing the accumulated kinetic energy when the flushing water discharged from the spout of the wash-down type flush toilet according to a comparative example flows into each region of the flow surface. Here, the kinetic energy of the flushing water shown in Figures 5, 6A, and 6B was measured using fluid analysis, and the measurement results are shown in Figures 5, 6A, and 6B.
[0031] First, when the user opens the operating lever (not shown) of the water storage tank 4, the drain valve 12 opens, and the cleaning water stored in the water storage tank 4 is discharged from the first outlet 24 and the second outlet 26 via the common water passage 8, the first water passage 28, and the second water passage 30.
[0032] As shown in Figure 5, when the operating lever is opened and water discharge begins, it takes approximately 5.5 seconds for the cleaning water to flow into the reservoir surface 20 and for this flow to end. This flow period can be divided into the initial cleaning stage E1, the middle cleaning stage E2, and the late cleaning stage E3. As can be seen from Figure 5, the kinetic energy of the cleaning water flowing into each region (S1, S2, S3, S4) of the reservoir surface 20 is considerable after 1 second has elapsed since the cleaning water flowed into the reservoir surface 20.
[0033] Next, as shown in Figure 6A, in the flush toilet 1 according to this embodiment, the kinetic energy (accumulated value) of the flushing water flowing into each region S1, S2, S3, and S4 of the water surface 20 rises (is generated) in all regions when time G1 is reached. Furthermore, it can be seen that the kinetic energy (accumulated value) of the four regions S1, S2, S3, and S4 reach a predetermined value J1 with a difference of less than 1 second (i.e., time T1).
[0034] In contrast, in the comparative example of this embodiment, the kinetic energy (accumulated value) of the washing water flowing into each region S1, S2, S3, and S4 of the water surface 20 rises (is generated) in all regions when time G2 is reached. Furthermore, it can be seen that the kinetic energy (accumulated value) of the four regions S1, S2, S3, and S4 reaches a predetermined value J1 with a difference of 1 second or more (i.e., time T2).
[0035] Next, Figure 7 will illustrate how the flushing water flows into the water reservoir in the flush toilet 1 according to this embodiment. Figure 7 is a plan view of the bowl section showing how the flushing water discharged from the first and second outlets flows into the water reservoir in the flush toilet according to this embodiment. As shown in Figure 7, first, the forward main stream F1 of the washing water discharged from the first outlet 24 flows through the forward area to the right of the waste receiving surface 16 of the bowl section 6, then reaches the rear area of the waste receiving surface 16, and flows into areas S2 and S1 of the accumulated water surface 20.
[0036] Next, the rear main stream F2 of the washing water discharged from the first outlet 26 flows through the rear area on the left side of the waste receiving surface 16 of the bowl section 6, then reaches the front area of the waste receiving surface 16, and flows into areas S4 and S3 of the accumulated water surface 20. As is clear from Figure 7, in the flush toilet 1 of this embodiment, the forward main stream F1 and the rear main stream F2 of the flushing water flow into the water surface 20 without merging. Furthermore, the forward main stream F1 and the rear main stream F2 of the washing water flow into different regions of the boundary area, which is divided into four regions S1, S2, S3, and S4, respectively.
[0037] The effects and benefits of the first embodiment described above will be explained below. First, in the flush toilet 1 according to this embodiment, the forward main stream F1 and the rear main stream F2 of the flushing water discharged from the first water outlet 24 and the second water outlet 26 swirl around the waste receiving surface 16 of the bowl 6 and are configured to flow into three or more of the four regions S1, S2, S3, and S4 of the water surface 20, which are divided into front-rear and left-right regions by a front-rear center line and a left-right center line in a plan view, at the beginning of flushing. Therefore, according to this embodiment, at the beginning of flushing, flushing water flows into three or more of the four regions S1, S2, S3, and S4 of the water surface, so that the timing of the discharge of floating waste can be accelerated. Furthermore, by applying pressure to the entire surface of the water surface 20, the water surface 20 is not disturbed, so the discharge force of floating waste can be improved.
[0038] Next, in the flush toilet 1 according to this embodiment, the predetermined amount of energy stored in the flushing water flowing into the water surface 20 is set so that it reaches three or more of the four regions S1, S2, S3, and S4 of the water surface within one second. As a result, the pressing pressure on the water surface 20 can be kept constant, and floating waste can be discharged while suppressing turbulence of the water surface 20.
[0039] Next, in the flush toilet 1 according to this embodiment, by forming a forward main stream F1 and a rear main stream F2 of flushing water, it is possible to clean the entire waste receiving surface 16 of the bowl 6 while improving the discharge performance of floating waste.
[0040] Next, in the flush toilet 1 according to this embodiment, the forward main stream F1 and the rear main stream F2 of the flushing water do not merge but flow into the water surface 20. This makes it easier to keep the energy of the flushing water flowing into three or more areas constant, and allows for the discharge of suspended waste while suppressing turbulence of the water surface 20.
[0041] Next, in the flush toilet 1 according to this embodiment, the forward main stream F1 and the rear main stream F2 of the flushing water flow into different regions of the boundary area, which is divided into four regions S1, S2, S3, and S4, respectively. In other words, they do not flow into the same region, making it easier to keep the pressure on the water surface 20 constant and to suppress turbulence of the water surface 20.
[0042] Next, in the flush toilet 1 according to this embodiment, the flush water discharged from the first water outlet 24 and the second water outlet 26 flows into the area on the side where the water outlets are not provided, so the flush water flows into the water reservoir 20 without swirling around the bowl surface 6, thus allowing the flush water to flow into the water reservoir 20 more quickly.
[0043] Next, a flush toilet 101 according to a second embodiment of the present invention will be described with reference to Figures 2 and 8 to 14. First, the specific shapes of the waste receiving surface 16 and the pot portion 22 of the flush toilet 101 will be explained with reference to Figures 8 to 10. Figure 8 is a perspective cross-sectional view of the wash-down type flush toilet according to this embodiment, viewed from diagonally above; Figure 9 is a partially enlarged longitudinal cross-sectional view of Figure 2; and Figure 10 is a partially enlarged plan cross-sectional view of Figure 1.
[0044] First, as shown in Figure 8, the rear surface 40 of the waste receiving surface 16 of the bowl portion 6 has a recess 40a that is deeper than the left and right sides 16a of the waste receiving surface 16. The lower end 40b of the rear surface 40 with this recess 40a extends below the upper ends 22c of the right side 22a and left side 22b of the pot portion 22.
[0045] As shown in Figure 9, the rear surface 40 of the waste receiving surface 16 of the bowl portion 6 is connected to the rear surface 22d of the pot portion 22 via a connecting portion 42. Here, the rear surface 40 of the waste receiving surface 16 is concave along the vertical direction, and the connecting portion 42 is convex, and the rear surface 40 and the connecting portion 42 are smoothly connected by an inflection point. This connecting portion 42 corresponds to the lower end 40b of the rear surface 40 of the waste receiving surface 16.
[0046] As shown in Figure 10, in a plan view, the lateral width W2 of the recess 40a on the rear surface 40 of the waste receiving surface 16 of the bowl portion 6 is formed to be narrower than the maximum lateral width W1 of the pot portion 22.
[0047] Next, the shape of the rear surface 22d of the socket portion 22 will be described with reference to Figures 2, 11, and 12. Figure 11 is a cross-sectional view along the line XI-XI in Figure 2, and Figure 12 is a cross-sectional view along the line XII-XII in Figure 2. As shown in Figure 11, the upper position of the rear surface 22d of the pot portion 22 is formed by a radius of curvature R1, and as shown in Figure 12, the lower position of the rear surface 22d of the pot portion 22 is formed by a radius of curvature R2. Here, the radius of curvature R2 is smaller than the radius of curvature R1 (R1 > R2). Therefore, as shown in Figure 8, the radius of curvature R2 at the lower position of the rear surface 22d of the pot portion 22 is close to the radius of curvature on the rear side of the inlet 10a of the drainage pipe 10, resulting in a smooth flow of cleaning water from the pot portion 22 to the drainage pipe 10.
[0048] Next, the flow of the flushing water will be explained with reference to Figures 13 and 14. Figure 13 is a perspective cross-sectional view showing the flow of the main flushing water behind the outlet of the flush toilet according to this embodiment, and Figure 14 is a perspective cross-sectional view showing the flow of the main flushing water in front of the outlet of the flush toilet according to this embodiment.
[0049] First, as shown in Figure 13, the rear main stream F2 of the washing water discharged from the second outlet 26 passes over the rear surface 40 of the waste receiving surface 16. However, due to the recess 41a, the water does not continue to swirl on the waste receiving surface 16 but flows along the left side surface 22b of the pot section 22 and flows almost entirely into the fourth region S4 and the third region S3 of the water reservoir 20 described above.
[0050] Next, as shown in Figure 14, the forward main flow F1 of the washing water discharged from the first discharge port 24 flows from the waste receiving surface 16 along the right side surface 22a of the pot section 22, and then collides with the recess 40a of the rear surface 40 of the waste receiving surface 16, where the flow direction of the forward main flow F1 is vector-changed from the front-rear direction to the lateral direction, and the forward main flow F1 flows into the second region S2 and the first region S1 of the reservoir surface 20 described above.
[0051] The following describes the operation and effects of the flush toilet according to the embodiment of the present invention described above. First, in the flush toilet 101 according to this embodiment, the rear surface 40 of the waste receiving surface 16 of the bowl portion 6 has a recess 40a that is deeper than the left and right sides 16a of the waste receiving surface 16, and this rear surface 40 extends below the upper ends 22c of the left and right sides 22a and 22b of the pot portion 22. As a result, the forward main flow F1 of the flushing water passes along the sides of the pot portion 22 and reaches the rear surface 40 of the waste receiving surface 16, where the direction of the flow changes and flows into the water surface 20 along the rear surface 40 of the waste receiving surface 16. As a result, according to this embodiment, the forward main flow F1 of the flushing water can be guided to the water surface 20 faster than it would flow into the water surface 20 by swirling around the waste receiving surface 16, so that the forward main flow F1 and the rear main flow F2 can be guided to the water surface 20 at almost the same timing, thereby improving the discharge performance of floating waste.
[0052] Next, as in the flush toilet described in Patent Document 1 above, if the rear recess of the waste receiving surface of the bowl is wider than the lateral width of the pot, the flushing water that swirls around the side of the pot from the front may spread out, potentially delaying its inflow into the water surface. In contrast, in the flush toilet 101 according to this embodiment, the lateral width W2 of the recess 40a of the rear surface 40 of the waste receiving surface 16 of the bowl 6 is formed to be narrower than the maximum lateral width W1 of the pot 22. Therefore, it is possible to suppress the spreading of flushing water that swirls around the side of the pot 22 from the front, and the inflow of the front main stream F1 of flushing water into the water surface 20 can be accelerated.
[0053] Next, in the flush toilet 101 according to this embodiment, the recess 40a on the rear surface 40 of the waste receiving surface 16 of the bowl portion 6 is formed in a concave shape along the vertical direction, and its lower end is connected to the rear surface 22d of the pot portion 22 by a convex connecting portion 42, so that the flushing water can be smoothly guided to the water surface 20.
[0054] Next, in the flush toilet 101 according to this embodiment, the radius of curvature R2 at the lower position of the rear surface 22d of the pot portion 22 is smaller than the radius of curvature R1 at the upper position (R1 > R2). As a result, the flow of flushing water from the pot portion 22 to the drain pipe 10 becomes smoother, and the waste discharge performance is improved.
[0055] Next, a flush toilet 201 according to a third embodiment of the present invention will be described with reference to Figures 15, 16, 17A, and 17B. First, the position of the water outlet (rim water outlet) of the bowl portion of the flush toilet according to this embodiment will be explained in detail with reference to Figure 15. Figure 15 is a plan cross-sectional view of the wash-down type flush toilet according to this embodiment. In this third embodiment, the first water outlet 24 and the second water outlet 26 described above will be described as the first rim water outlet 24 and the second rim water outlet 26 for convenience.
[0056] As shown in Figure 15, the position of the rim outlet of the flush toilet 201 according to this embodiment will be explained by dividing the plane of the bowl portion 6 into nine regions. The plane of the bowl portion 6 is divided into nine regions (f1~f3, m1~m3, r1~r3) by extension lines X1 extending in the left-right direction at the front end s1 of the water surface 20, extension line X2 extending in the left-right direction at the rear end s2 of the water surface 20, extension line Y1 extending in the front-rear direction at the left end s3 of the water surface 20, and extension line Y2 extending in the front-rear direction at the right end s4 of the water surface 20.
[0057] Specifically, the plane of the bowl portion 6 is divided into a front region (f1~f3) located in front of the front end s1 of the water surface 20, a lateral region (m1~m3) located between the front end s1 and the rear end s2 of the water surface 20, and a rear region (r1~r3) located behind the rear end s2 of the water surface 20. Furthermore, the front region is divided into a left front region f1 located to the left of the left end s3 of the water surface 20, an intermediate front region f2 located between the left end s3 and the right end s4 of the water surface 20, and a right front region f3 located to the right of the right end s4 of the water surface 20. Similarly, the lateral region is divided from left to right into a left lateral region m1, an intermediate lateral region m2, and a right lateral region m3, and the rear region is divided from left to right into a left rear region r1, an intermediate rear region r2, and a right rear region r3.
[0058] In this embodiment, the water surface 20 is formed in the intermediate lateral region m2 located in the center of the bowl portion 6. The first rim outlet 24 is positioned in the left front region f1, forward of the front end s1 (extension line X1) of the water surface 20 and to the left of the left end s3 (extension line Y1) of the water surface 20. Furthermore, the first rim outlet 24 is positioned upstream of the tip of the bowl portion 6, which has the smallest radius of curvature in a plan view of the bowl portion 6.
[0059] The second rim outlet 26 is located in the right rear region r3, behind the rear end s2 (extension line X2) of the water surface 20 and to the right of the right end s4 (extension line Y2) of the water surface 20. Furthermore, the second rim outlet 26 is located near the rear end of the bowl portion 6.
[0060] The first rim outlet 24 and the second rim outlet 26 are located in the left front region f1 and the right rear region r3, respectively, which are diagonally opposite each other, straddling the intersection point O where the center line X that bisects the front-to-back direction of the water surface 20 intersects the center line Y that bisects the left-to-right direction of the water surface 20. In this embodiment, the first rim outlet 24 is located in the left front region f1 and the second rim outlet 26 is located in the right rear region r3. However, alternatively, the first rim outlet 18 may be located in the right front region f3 and the second rim outlet 26 may be located in the left rear region r1.
[0061] Next, with reference to Figures 16, 17A, and 17B, the flow of flushing water in the flush toilet according to this embodiment will be explained in comparison with Conventional Example 1 and Conventional Example 2. Figure 16 is a conceptual plan view illustrating the position of the water outlet (rim water outlet) and the flow of flushing water in the wash-down type flush toilet according to this embodiment, Figure 17A is a conceptual plan view illustrating the position of the water outlet (rim water outlet) and the flow of flushing water in the flush toilet according to Conventional Example 1, and Figure 17B is a conceptual plan view illustrating the position of the water outlet (rim water outlet) and the flow of flushing water in the flush toilet according to Conventional Example 2.
[0062] Regarding the first rim outlet, in Conventional Example 1 (see Figure 17A), the first rim outlet 124 is located in the left lateral region m1 between the front end s1 and the rear end s2 of the water reservoir 20. Therefore, the cleaning water discharged forward from the first rim outlet 124 cannot flow into the water reservoir 20 in the left lateral region m1. Instead, it passes through the left lateral region m1 and flows through the front region (f1~f3) before flowing into the water reservoir 20 from the front (see the arrow in Figure 17A). In contrast, in this embodiment (see Figure 16), the first rim outlet 24 is located in the left front region f1, which is in front of the front end s1 of the water reservoir 20. Therefore, the cleaning water discharged forward from the first rim outlet 24 flows through the front region (f1~f3) and can flow into the water reservoir 20 from the front without passing through other regions (see the arrow in Figure 16).
[0063] Regarding the second rim outlet, in the conventional example 2 (see Figure 17B), the second rim outlet 226 is located in the right lateral region m3 between the front end s1 and the rear end s2 of the water reservoir 20. Therefore, the cleaning water discharged from the second rim outlet 226 to the rear cannot flow into the water reservoir S in the right lateral region m3. Instead, it passes through the right lateral region m3 and flows through the rear region (r1~r3) before flowing into the water reservoir 20 from the rear (see the arrow in Figure 6(b)). In contrast, in this embodiment (see Figure 16), the second rim outlet 26 is located in the right rear region r3, which is behind the rear end s2 of the water reservoir 20. Therefore, the cleaning water discharged from the second rim outlet 26 to the rear can flow through the rear region (r1~r3) and flow into the water reservoir 20 from the rear without passing through other regions (see the arrow in Figure 16).
[0064] In this embodiment (see Figure 16), the first rim outlet 24 is located in the left front region f1, forward of the front end s1 of the water surface 20, and the second rim outlet 26 is located in the right rear region r3, backward of the rear end s2 of the water surface 20. Therefore, at the start of cleaning, the cleaning water discharged forward from the first rim outlet 24 and the cleaning water discharged backward from the second rim outlet 26 flow into the water surface 20 earlier and almost simultaneously compared to the conventional example (see the arrows in Figure 16).
[0065] Next, the effects and benefits of the flush toilet 201 according to the third embodiment of the present invention described above will be explained. In the flush toilet 201 according to this embodiment, the first rim outlet 24 is positioned in front of the front end s1 of the water surface 20 in the inner space of the bowl 6, and flushing water is discharged forward from the first rim outlet 24. At the same time, the second rim outlet 26 is positioned behind the rear end s2 of the water surface 20 in the bowl 6, and flushing water is discharged backward from the second rim outlet 26. Therefore, at the start of flushing, the flushing water from the first rim outlet 24 and the second rim outlet 26 flows into the water early and almost simultaneously, allowing the flushing water to flow evenly across the entire water surface 20. Thus, in a flush toilet where all the flushing water supplied to the toilet body 2 is discharged from the rim outlets, floating waste can be sufficiently discharged.
[0066] Furthermore, in the flush toilet 201 according to this embodiment, preferably, the first rim outlet 24 and the second rim outlet 26 are positioned to the left of the left edge s3 of the water surface 20 or to the right of the right edge s4 of the water surface 20. This allows flushing water from the first rim outlet 24 and the second rim outlet 26 to flow into the water more simultaneously when flushing starts, ensuring that the flushing water is evenly distributed across the entire water surface 20.
[0067] In the flush toilet 201 according to this embodiment, preferably, the first rim outlet 24 and the second rim outlet 26 are arranged in diagonal regions that straddle the intersection point O where the center line X that bisects the front-to-back direction of the water surface 20 and the center line Y that bisects the left-to-right direction of the water surface 20 intersect in a plan view. Therefore, when flushing starts, flushing water from the first rim outlet 24 and the second rim outlet 26 can flow into the water more simultaneously, allowing the flushing water to flow evenly across the entire water surface 20.
[0068] In this embodiment, a flush toilet equipped with two rim spouts has been described, but the present invention is not limited thereto and may also be applied to a flush toilet equipped with three or more rim spouts. In this case, the three or more rim spouts may be distributed and arranged in any of the above-described left front region f1, right front region f3, left rear region r1, or right rear region r3.
[0069] Next, a supplementary explanation of the flush toilet according to this embodiment will be given. In the flush toilets 1, 101, and 201 according to this embodiment, as described above, the bowl portion 6 is provided with a pot portion 22 that forms a water surface 20 inside, and this pot portion 22 has a roughly triangular shape in plan view. The height of the upper ends 22c of the right side portion 22a and the left side portion 22b of this pot portion 22 is formed such that it becomes lower toward the front, as shown in Figures 8 and 9. Therefore, the rear main flow F2 flows along the left side portion 22b of the upper end 22c, where the height of the left side portion 22b is roughly constant, and at the inclined portion of the upper end 22C that becomes lower toward the front, the flow along the upper end 22c diverges at the point of change in the upper end 22c and changes direction to flow from the left side portion 22b into the water surface 20. Thus, the rear main flow F2 can function as an inflow promoting means to suppress the delay in inflow into the water surface 20 caused by the rear main flow F2 circulating around the side of the pot portion 22. Since the upper end 22c of the right side surface 22a is formed to rise from front to rear, the forward main flow F1 flows along the right side surface 22a, and at the sloping section of the upper end 22C that rises towards the rear, the flow along the upper end 22c is more likely to change direction to flow from the right side surface 22b into the reservoir surface 20. This allows the forward main flow F1 to circulate around the side of the reservoir section 22 and function as an inflow-promoting means to suppress the delay in its inflow into the reservoir surface 20.
[0070] In addition, since the height of the upper edges 22c of both sides 22a and 22b of the pot section 22 decreases toward the front, the rear main flow F2 that flows down from behind the pot section 22 and flows along the left side 22b flows into the water surface 20 and then hits the front of the pot section 22 and rises. At this time, the rear main flow F1 flows into the pot section 22 from the front area of the waste receiving surface 16 of the bowl section 6, and the rear main flow F2 and the front main flow F1 merge in front of the pot section 22, resulting in the formation of a strong pushing flow and improved waste discharge performance. [Explanation of Symbols]
[0071] 1 flush toilet 2 Toilet bowl 4. Water storage tank 6. Bowl section 10 Drain line 16 Waste receiving surface 18 Rim section 20 Water surface 22 Acupressure points 24 First discharge outlet 26. Second discharge outlet S1 1st area S2 2nd area S3 3rd area S4 4th area
Claims
1. A flush toilet that uses flushing water to wash away waste, A bowl portion comprising a waste receiving surface for receiving waste, a rim portion formed on the upper part of the waste receiving surface, and a pot portion formed on the lower part of the waste receiving surface with a water reservoir inside, A first rim outlet and a second rim outlet for discharging cleaning water along the rim portion, wherein the first rim outlet is located in the rear left region of the bowl portion and forms a forward main flow that swirls around the front side of the waste receiving surface of the bowl portion, and the second rim outlet is located in the rear right region of the bowl portion and forms a rear main flow that swirls around the rear side of the waste receiving surface of the bowl portion, A water storage tank that supplies cleaning water to the first rim outlet and the second rim outlet, It has a drainage pipe connected to the bottom of the bowl section, The second rim outlet described above is positioned behind the rear end of the water surface and to the right of the right end of the water surface. The forward main stream of cleaning water discharged from the first rim outlet and the rear main stream of cleaning water discharged from the second rim outlet flow into four different regions of the reservoir surface, which are divided into four regions by the front-to-back and left-to-right centerlines that divide the reservoir surface in the front-to-back and left-to-right directions in a plan view. These regions include the first region on the left rear side, the second region on the right rear side, the third region on the right front side, and the fourth region on the left front side, respectively, during the initial period of cleaning, which is the first of three divisions of the period from the inflow of cleaning water into the reservoir surface to the end of the inflow. The rear surface of the waste receiving surface of the bowl portion is connected to the rear surface of the pot portion via a connecting part, and the rear surface extends below the upper ends of the left and right sides of the pot portion. A wash-down type flush toilet characterized in that the forward main flow of flushing water discharged from the first water outlet flows from the waste receiving surface along the right side of the pot section, then collides with the rear surface of the waste receiving surface, causing the flow direction of the forward main flow to be vector-changed from the front-to-back direction to the side-to-side direction, and the forward main flow flows into the second and first regions of the water reservoir surface.
2. The wash-down type flush toilet according to claim 1, wherein the forward main stream and the rear main stream of the flushing water described above are configured to flow into the water surface described above without merging.
3. The wash-down type flush toilet according to claim 1 or 2, wherein the first rim water outlet is located in front of the water surface and to the left of the left edge of the water surface.
Citation Information
Patent Citations
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