JP7750185B2 - flush toilet - Google Patents

Description

The disclosed embodiment relates to a flush toilet.

In the past, a technology has been known for flushing toilets in which the bowl surface of the bowl portion that receives waste is cleaned by supplying flush water from a spout onto the bowl surface in a swirling flow (swirl flow).

Some flush toilets of this type are equipped with a water storage tank, and have a reduced diameter section in the water conduit through which flush water flows toward the bowl surface, so that the greater the water supply flow rate from the water storage tank, the smaller the water flow cross-sectional area of the water conduit. Whether the water supply flow rate is greater or less than that required by the toilet body, changes in the distribution ratio and flow rate of the flush water supplied from the spout are suppressed, allowing flush water at an appropriate supply flow rate to be supplied to the bowl (see, for example, Patent Document 1).

Japanese Patent Application Laid-Open No. 2020-159188

By the way, so-called flush valve toilets, which supply primary water pressure to the toilet bowl itself, have different water pressures depending on the region where the toilet is installed, so the flush water flowing through the water conduit can sometimes be low flow or high flow, and primary water pressure can vary from region to region.

In contrast, conventional flush toilets such as those described above require a water storage tank, making it difficult to accommodate fluctuations in the flow rate of flush water in toilets that supply primary water pressure to the toilet body, such as flush valve toilets.

Furthermore, for example, if the flush water outlet is defined as an opening that determines the flow rate of flush water supplied to the bowl surface of the bowl section, it is conceivable to switch the outlet depending on whether the flush water flowing through the headrace is at a low flow rate or a high flow rate. In contrast, with conventional flush toilets such as those described above, the cross-sectional area of the flush water flowing through the headrace is reduced once at the reduced diameter section, but then increases again when it is supplied from the outlet, so the outlet is not switched depending on whether the flush water flowing through the headrace is at a low flow rate or a high flow rate.

One aspect of this embodiment aims to provide a flush toilet that can accommodate fluctuations in flush water flow rate and ensure basic toilet performance over a wide range of water supply flow rates.

A flush toilet according to one embodiment comprises a bowl section that receives waste, a trap section that extends from the bowl section and discharges waste received in the bowl section, a main conduit through which flush water flows toward the bowl section, a rim connection hole into which flush water flows from the main conduit, a rim conduit through which flush water that has flowed in from the rim connection hole flows, and a rim spout that supplies flush water flowing in the rim conduit to the bowl section, the rim spout having a low-flow outlet that functions as the rim spout when the flow rate of flush water flowing in the rim conduit is low, and a high-flow outlet that functions as the rim spout when the flow rate of flush water flowing in the rim conduit is high.

With this configuration, when the flush water flowing through the rim conduit is at a low flow rate, the rim spout switches to a low-flow spout. This prevents a decrease in the flow momentum (flow speed) of the flush water supplied from the rim spout (low-flow spout) when the flush water flowing through the rim conduit is at a low flow rate, and prevents a decrease in the flushing performance of the bowl. On the other hand, when the flush water flowing through the rim conduit is at a high flow rate, the rim spout switches to a high-flow spout. This prevents the flow momentum (flow speed) of the flush water supplied from the rim spout (high-flow spout) from increasing too much when the flush water flowing through the rim conduit is at a high flow rate, and prevents flush water from splashing out of the bowl. In this way, because it is possible to prevent a decrease in flushing performance and flush water from splashing out regardless of fluctuations in the flush water flow rate, i.e., because it can respond to fluctuations in the flush water flow rate, the basic performance of the toilet can be maintained over a wide range of water supply flow rates.

Furthermore, in the flush toilet described above, the low-flow discharge outlet and the high-flow discharge outlet are formed in the same flow path, and the low-flow discharge outlet has a smaller flow path cross-sectional area than the high-flow discharge outlet.

With this configuration, when the flush water flowing through the rim conduit is at a low flow rate, the flow rate of the flush water supplied to the bowl section is determined by the low-flow outlet, which has a small cross-sectional area of the flow path. This makes it possible to prevent a decrease in the flow rate of the flush water supplied from the rim outlet (low-flow outlet) when the flush water W flowing through the rim conduit is at a low flow rate, and to prevent a decrease in the flushing performance of the bowl section. On the other hand, when the flush water flowing through the rim conduit is at a high flow rate, the flow rate of the flush water supplied to the bowl section is determined by the high-flow outlet, which has a large cross-sectional area of the flow path. This makes it possible to prevent the flow rate of the flush water supplied from the rim outlet (high-flow outlet) from increasing too much when the flush water flowing through the rim conduit is at a high flow rate, and to prevent flush water from splashing out of the bowl section.

Furthermore, in the flush toilet described above, the low-flow outlet is positioned upstream of the high-flow outlet.

This configuration makes it possible to form a low-flow discharge outlet and a high-flow discharge outlet in the same flow path. When the flush water W flowing through the rim water conduit is at a low flow rate, the flush water is supplied to the bowl section from the low-flow discharge outlet, preventing a decrease in the flow rate of the flush water supplied from the rim water conduit (low-flow discharge outlet), and preventing a decrease in the flushing performance of the bowl section. On the other hand, when the flush water flowing through the rim water conduit is at a high flow rate, the flow rate of the flush water supplied from the rim water conduit (high-flow discharge outlet) can be prevented from increasing too much, preventing flush water from splashing out of the bowl section.

Furthermore, in the flush toilet described above, the rim water conduit has a flow path cross-sectional area that continuously and gradually increases from the low-flow outlet side to the high-flow outlet side, including at least the area immediately downstream of the low-flow outlet.

With this configuration, the rim conduit gently widens its flow path from the low-flow outlet on the upstream side to the high-flow outlet on the downstream side, from the low-flow outlet on the upstream side, to the high-flow outlet on the downstream side, between the low-flow outlet and the high-flow outlet, including at least the area immediately downstream of the low-flow outlet. As a result, flush water flowing in the rim conduit from the low-flow outlet to the high-flow outlet is drawn to the inner surface of the rim conduit (Coanda effect), and flush water flows along the flow path shape of the rim conduit, preventing water shortages. As a result, when flush water flowing in the rim conduit at a low flow rate, it is possible to prevent a decrease in the flow rate of flush water supplied from the rim conduit (low-flow outlet), and to prevent a decrease in the cleaning performance of the bowl.

Furthermore, in the flush toilet described above, the rim water conduit has a stirring chamber upstream of the low-flow discharge outlet, the chamber having a larger flow path cross-sectional area than the low-flow discharge outlet.

With this configuration, the flow of flush water is turbulent in the agitation chamber, and this turbulent flow causes flush water to flow into the low-flow outlet, making the low-flow outlet more likely to become watertight. This makes it possible to prevent a decrease in the flow rate of flush water supplied from the rim outlet (low-flow outlet) when the flush water flowing through the rim water conduit is at a low flow rate, thereby preventing a decrease in the cleaning performance of the bowl section.

The flush toilet described above also includes a jet conduit through which flush water flows from the main conduit, a jet outlet that sprays flush water that has flowed down the jet conduit from in front of the trap section toward the trap section, and a pressure-controlling section that connects the main conduit and the rim conduit upstream of the jet conduit.

With this configuration, the rim conduit branches off from the main conduit upstream of the jet conduit, so the flow rate of flush water flowing into the rim conduit does not affect the high-speed jet discharge, and the flow rate of flush water flowing from the main conduit into the rim conduit can be controlled by the pressure-controlling section. As a result, when the flow rate of flush water flowing through the rim conduit is low, flush water is supplied to the bowl section from the low-flow discharge outlet, preventing a decrease in the flow rate of flush water supplied from the rim discharge outlet (low-flow discharge outlet), and preventing a decrease in the flushing performance of the bowl section. On the other hand, when the flow rate of flush water flowing through the rim conduit is high, the flow rate of flush water supplied from the rim discharge outlet (high-flow discharge outlet) can be prevented from increasing too much, preventing flush water from splashing out of the bowl section.

Furthermore, in the flush toilet described above, the rim water conduit has a stirring chamber upstream of the low-flow discharge outlet, the low-flow discharge outlet has a larger flow path cross-sectional area than the pressure-controlling section, and the high-flow discharge outlet and the stirring chamber have larger flow path cross-sectional areas than the low-flow discharge outlet.

With this configuration, the flush water distribution between the rim spout and the jet spout can be determined by the pressure rate-controlling section, and when the flush water flowing through the rim water conduit is at a low flow rate, the rate of the flush water can be controlled by the small cross-sectional area of the low-flow spout.

Furthermore, in the flush toilet described above, the central axis of the pressure-controlling section in the direction of flush water flow is positioned above the central axis of the low-flow discharge outlet in the direction of flush water flow.

With this configuration, flush water that has gained momentum (speed increased) in the pressure-controlling section does not flow directly into the low-flow discharge port, but rather flows into a turbulent, swirling state in the agitation chamber before flowing into the low-flow discharge port, making the low-flow discharge port more likely to be watertight. This makes it possible to prevent a decrease in the flow rate of flush water supplied from the rim discharge port (low-flow discharge port) when the flush water flowing through the rim water conduit is at a low flow rate, and prevents a decrease in the cleaning performance of the bowl section.

Furthermore, in the flush toilet described above, the rim water conduit has a stirring chamber upstream of the low-flow discharge outlet that has a larger flow path cross-sectional area than the low-flow discharge outlet, and the stirring chamber has a wall portion upstream of the low-flow discharge outlet.

With this configuration, flush water that has gained momentum (accelerated) in the pressure-controlling section collides with the wall before flowing into the low-flow discharge port, causing the flow to become turbulent and swirling in the agitation chamber, making the low-flow discharge port more likely to become watertight. This makes it possible to prevent a decrease in the flow rate of flush water supplied from the rim discharge port (low-flow discharge port) when the flush water flowing through the rim water conduit is at a low flow rate, and prevents a decrease in the cleaning performance of the bowl section.

A flush toilet according to one embodiment can accommodate fluctuations in the flush water flow rate, ensuring the basic performance of the toilet over a wide range of water supply flow rates.

FIG. 1 is a schematic perspective view showing a flush toilet according to an embodiment. FIG. 2 is a schematic plan view showing the rim conduit and the jet conduit. FIG. 3 is a schematic perspective view showing the rim water conduit and the rim spout. FIG. 4 is an explanatory diagram (part 1) of flush water from the low flow rate outlet which becomes the rim outlet when the flush water flowing through the rim water conduit is at a low flow rate. FIG. 5 is an explanatory diagram (part 2) of flush water from the low flow rate outlet which becomes the rim outlet when the flush water flowing through the rim water conduit is at a low flow rate. FIG. 6 is an explanatory diagram of flush water from a high flow rate outlet that becomes a rim outlet when the flush water flowing through the rim water conduit is at a high flow rate.

Embodiments of the flush toilet disclosed in this application will be described in detail below with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments shown below.

<Overall configuration of a flush toilet>
An example of the overall configuration of a flush toilet 1 according to an embodiment will be described with reference to Figures 1 and 2. Figure 1 is a schematic perspective view showing a flush toilet 1 according to an embodiment. Figure 2 is a schematic plan view showing the rim water channel 42 and jet water channel 51.

Note that each figure, including Figure 1, may show a three-dimensional Cartesian coordinate system that includes a Z-axis, with the positive direction being vertically upward (upward). For ease of explanation, the positive direction of the X-axis will be defined as the left, the negative direction of the X-axis as the right, the positive direction of the Y-axis as the forward direction, and the negative direction of the Y-axis as the backward direction. Furthermore, the X-axis direction may also be referred to as the left-right direction, the Y-axis direction as the front-back direction, and the Z-axis direction as the up-down direction.

As shown in Figure 1, the flush toilet 1 is a so-called wall-mounted type that is attached to the wall of a toilet room. However, the flush toilet 1 may also be a so-called floor-standing type that is installed on the floor of a toilet room.

Flush toilet 1 is a so-called blowout type, in which flush water is sprayed with great force from jet spout 4 (see Figure 2) described below toward trap section 3 described below, generating a strong water current that blows waste downstream. However, flush toilet 1 may also be of other types, such as a wash-down type or a siphon type.

Flush toilet 1 is a so-called flush valve type, which supplies flush water to the toilet body 2 (described below) using primary water pressure from a water supply source such as a tap.

Flush toilet 1 is made of ceramic. However, flush toilet 1 is not limited to being made of ceramic, and may be made of resin, or may be made from a combination of ceramic and resin.

As shown in Figures 1 and 2, the flush toilet 1 comprises a toilet body 2. The toilet body 2 comprises a bowl section 21, a rim section 22, a trap section 23, a skirt section 24, and a back surface 25. The toilet body 2 also comprises a main water channel 31, a rim connection hole 41 (see Figure 3), a rim water conduit 42, a rim spout 43, a jet water conduit 51, and a jet spout 52.

The bowl portion 21 has a bowl-shaped inner surface (bowl surface) 21a that receives waste. A predetermined amount of water is stored at the bottom of the bowl portion 21. A trap portion 23 is also connected to the bottom of the bowl portion 21.

The rim portion 22 is provided on the upper edge of the bowl portion 21. The rim portion 22 is formed in an annular shape along the upper edge of the bowl portion 21.

The trap section 23 extends rearward from the bottom of the bowl section 21 and discharges waste received in the bowl section 21 into an external pipe (not shown). The trap section 23 includes, for example, an uprising pipe 231 and a downcomer pipe 232. The upstream end of the upcomer pipe 231 is connected to the bottom of the bowl section 21. The upcomer pipe 231 is a pipe that slopes upward as it extends rearward from the bottom of the bowl section 21. The upstream end of the downcomer pipe 232 is connected to the downstream end of the upcomer pipe 231. The downcomer pipe 232 is a pipe that extends downward from the upcomer pipe 231. The downstream end of the downcomer pipe 232 is connected to an external pipe (not shown).

The skirt portion 24 is provided to cover the front region of the bowl portion 21. The skirt portion 24 forms the outer shape of the flush toilet 1 in the front region of the bowl portion 21.

The back surface 25 is provided behind the bowl portion 21. The back surface 25 is fixed to the wall surface of the toilet room, for example, by attaching a mounting fixture to the mounting hole. By fixing the back surface 25 to the wall surface in this way, the flush toilet 1 is fixed to the wall surface.

As shown in Figure 2, the main waterway 31 extends forward from the flush water supply port 71 in the flush toilet 1. Flush water W (W1) flows through the main waterway 31 toward the bowl section 21. The main waterway 31 is connected to the rim waterway 42 and jet waterway 51, which will be described later.

As shown in Figure 2, the rim connection hole 41 is an inlet (hole) into which flush water W1 flows from the main conduit 31. Flush water W1 branching off from the main conduit 31 flows into the rim connection hole 41. The rim conduit 42 is located downstream of the rim connection hole 41 and is a flow path through which flush water W (W21) flowing in from the rim connection hole 41. The rim conduit 42 will be described later using Figure 3 etc.

The rim spout 43 is the outlet for flush water W21 from the rim water conduit 42, and supplies the flush water W21 flowing through the rim water conduit 42 to the bowl section 21. The flush water W22 supplied from the rim spout 43 to the bowl section 21 becomes a swirling flow that swirls around the bowl surface 21a and flows into the trap section 23. In the flush toilet 1, this swirling flow cleans the bowl surface 21a (tornado flush).

The rim spout 43 also includes a low-flow spout 431 and a high-flow spout 432. The configuration of the rim spout 43 (low-flow spout 431 and high-flow spout 432) will be described later using Figure 3, etc.

As shown in FIG. 2, the jet conduit 51 is a flow path into which flush water W1 from the main conduit 31 flows, and through which flush water W (W31) flows toward the jet outlet 52, described below. The jet conduit 51 receives flush water W1 from the main conduit 31 downstream of the pressure-controlling section 45, described below, which connects the main conduit 31 and the rim conduit 42.

The jet outlet 52 sprays the flush water W (W32) that has flowed through the jet water conduit 51 from the front of the trap section 23 toward the trap section 23.

As shown in Figure 1, the flush toilet 1 may also be equipped with a fascia 61 to reinforce the trap section 23. Such a fascia 61 is a plate-shaped member that is provided below the trap section 23.

<Rim waterway and rim outlet>
Next, the rim water conduit 42 and the rim water outlet 43 will be described with reference to Figure 3. Figure 3 is a schematic perspective view showing the rim water conduit 42 and the rim water outlet 43.

As shown in Figure 3, the rim water conduit 42 carries flush water W21 that flows in from the rim connection hole 41.

The rim conduit 42 has an inclined wall 421 whose top surface slopes upward as it moves downstream, at least up to the high-flow outlet 432, including the downstream area A1 immediately adjacent to the low-flow outlet 431. The rim conduit 42 also has an inclined wall 422 whose bottom surface slopes downward as it moves downstream, at least up to the high-flow outlet 432, including the downstream area A1 immediately adjacent to the low-flow outlet 431. Thus, the rim conduit 42 has a portion where the flow path cross-sectional area S (S1) continuously and gradually expands from the low-flow outlet 431 (described below) side, which becomes the rim outlet 43, to the downstream high-flow outlet 432 side. In other words, the rim conduit 42 is a flow path with a portion that gradually expands from the upstream low-flow outlet 431 side to the downstream high-flow outlet 432 side. The flow path cross-sectional area S is a cross section cut perpendicular to the flow direction of the flush water W21. The rim water conduit 42 only needs to have inclined walls 421, 422 in at least the downstream area A1 immediately adjacent to the low flow rate outlet 431, but may also have inclined walls 421, 422 throughout the entire area between the low flow rate outlet 431 and the high flow rate outlet 432, for example.

As described above, the rim water outlet 43 is the outlet for flush water W21 in the rim water conduit 42, and supplies the flush water W21 flowing through the rim water conduit 42 to the bowl section 21. The rim water outlet 43 includes a low-flow water outlet 431 and a high-flow water outlet 432.

The low-flow discharge outlet 431 is formed midway through the rim conduit 42 and functions as the rim discharge outlet 43 when the flush water W21 flowing through the rim conduit 42 is at a low flow rate. The low-flow discharge outlet 431 regulates the flow rate of the flush water W21 (W22) when the flush water W21 flowing through the rim conduit 42 is at a low flow rate.

The high-flow discharge outlet 432 is formed at the downstream end of the rim water conduit 42 and functions as the rim water conduit 43 when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate. The high-flow discharge outlet 432 regulates the flow rate of the flush water W21 (W22) when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate.

In this way, the low-flow outlet 431 and the high-flow outlet 432 are formed in the same flow path, the rim water conduit 42, and are arranged in the rim water conduit 42 so that the low-flow outlet 431 is on the upstream side and the high-flow outlet 432 is on the downstream side. Furthermore, the flow path cross-sectional area S (S2) of the low-flow outlet 431 is smaller than the flow path cross-sectional area S (S3) of the high-flow outlet.

The rim water conduit 42 has a stirring chamber 44 located upstream of the low-flow discharge port 431. The flow path cross-sectional area S (S4) of the stirring chamber 44 is larger than the flow path cross-sectional area S2 of the low-flow discharge port 431. The stirring chamber 44 also has a wall portion 441 that is approximately perpendicular to the flow direction of the flush water W21 so as to block the flow of the flush water W21. The wall portion 441 is located upstream of the low-flow discharge port 431 and faces the rim connection hole 41.

As shown in Figure 3, the flush toilet 1 (see Figure 1) is also equipped with the pressure-controlling section 45 described above. The pressure-controlling section 45 is the section that connects the main conduit 31 and the rim conduit 42, and controls the flow rate of the flush water W21 that flows in from the rim connection hole 41 before it flows into the rim conduit 42. This pressure-controlling section 45 connects the main conduit 31 and the rim conduit 42 upstream of the jet conduit 51 (see Figure 2).

Also, as shown in FIG. 3, in the rim water conduit 42, the flow path cross-sectional area S2 of the low flow rate water outlet 431 is larger than the flow path cross-sectional area S (S5) of the pressure-controlling section 45. Furthermore, the flow path cross-sectional area S3 of the high flow rate water outlet 432 is larger than the flow path cross-sectional area S2 of the low flow rate water outlet 431. Furthermore, the flow path cross-sectional area S4 of the stirring chamber 44 is larger than the flow path cross-sectional area S2 of the low flow rate water outlet 431.

<Flow pattern of flush water at low flow outlet>
Next, the flow pattern of flush water W21 at the low flow rate outlet 431 will be described with reference to Figures 4 and 5. Figures 4 and 5 are explanatory diagrams of flush water W21 at the low flow rate outlet 431, which becomes the rim spout 43 when the flush water W21 flowing through the rim conduit 42 is at a low flow rate. Note that Figure 4 schematically shows the rim conduit 42 as viewed from the horizontal direction. Also, Figure 5 schematically shows the predetermined area A2 on the upstream side of the rim conduit 42 as viewed from the vertical direction (above).

As shown in Figure 4, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, the flow rate of the flush water W21 supplied from the rim water conduit 42 to the bowl section 21 (see Figure 2) is determined by the low-flow discharge port 431, which has a small flow path cross-sectional area S2.

The flush water W21, whose flow rate is regulated by the low-flow discharge port 431, is drawn to the inner surface of the rim water conduit 42 by the Coanda effect and flows along the flow path shape, as the flow path of the rim water conduit 42 gradually expands toward the downstream high-flow discharge port 432. This prevents a decrease in the flow rate of the flush water W22 supplied from the rim water discharge port 43 (low-flow discharge port 431) to the bowl section 21.

Furthermore, as shown in FIG. 4, the central axis L (L1) of the flush water W21 in the flow direction at the pressure rate-controlling section 45 is located above the central axis L (L2) of the flush water W21 in the flow direction at the low flow rate water outlet 431, so the flush water W21 accelerated in the pressure rate-controlling section 45 does not flow directly into the low flow rate water outlet 431. Furthermore, the flush water W21 accelerated in the pressure rate-controlling section 45 becomes turbulent and swirles in the upstream stirring chamber 44 before flowing into the low flow rate water outlet 431. This makes it easier for the low flow rate water outlet 431 to be watertight.

In addition, because the low-flow water outlet 431 is located above the stirring chamber 44, the flush water W21 accelerated by the pressure-controlling section 45 does not flow directly into the low-flow water outlet 431, but rather becomes turbulent and swirling in the upstream stirring chamber 44 before flowing into the low-flow water outlet 431. This makes it easier for the low-flow water outlet 431 to be watertight.

In addition, as shown in Figure 5, the wall portion 441 located upstream of the low-flow water outlet 431 causes the flush water W21, whose speed has increased in the pressure-controlling portion 45, to collide with the wall portion 441 before flowing into the low-flow water outlet 431, causing the flow to become turbulent and swirling in the stirring chamber 44, making the low-flow water outlet 431 more likely to be watertight.

<Flow pattern of flush water at high flow rate outlet>
Next, the flow pattern of flush water W21 at the high flow rate outlet 432 will be described with reference to Figure 6. Figure 6 is an explanatory diagram of flush water W21 (W22) at the high flow rate outlet 432, which becomes the rim spout 43 when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate. Note that Figure 6 schematically shows the rim water conduit 42 as viewed from the horizontal direction.

As shown in Figure 6, when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate, the flow rate of the flush water W22 supplied from the rim water conduit 42 to the bowl section 21 (see Figure 2) is determined by the high-flow discharge port 432, which has a large flow path cross-sectional area S3.

The flush water W22 from the high flow rate outlet 432 is supplied to the bowl section 21 at a controlled flow rate in the rim water conduit 42, whose flow path gradually widens toward the high flow rate outlet 432. As a result, the flow rate of the flush water W22, whose flow rate is regulated by the high flow rate outlet 432, does not increase too much.

In the flush toilet according to the embodiment described above, when the flow rate of flush water W21 flowing through the rim conduit 42 is low, the rim spout 43 switches to the low-flow spout 431. This makes it possible to prevent a decrease in the flow momentum (flow speed) of flush water W22 supplied from the rim spout 43 (low-flow spout 431) when the flow rate of flush water W21 flowing through the rim conduit 42 is low, and to prevent a decrease in the flushing performance of the bowl section 21. On the other hand, when the flow rate of flush water W21 flowing through the rim conduit 42 is high, the rim spout 43 switches to the high-flow spout 432. This makes it possible to prevent an excessive increase in the flow momentum (flow speed) of flush water W22 supplied from the rim spout 43 (high-flow spout 432) when the flow rate of flush water W21 flowing through the rim conduit 42 is high, and to prevent flush water W from splashing out of the bowl section 21. In this way, deterioration of flushing performance and splashing of flush water W can be prevented regardless of fluctuations in the flow rate of flush water W, meaning that fluctuations in the flow rate of flush water W can be accommodated, ensuring the basic performance of the toilet over a wide range of water supply flow rates.

Furthermore, the low-flow discharge outlet 431 and the high-flow discharge outlet 432 are formed in the same flow path, and the flow path cross-sectional area S2 of the low-flow discharge outlet 431 is smaller than the flow path cross-sectional area S3 of the high-flow discharge outlet 432. Therefore, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, the flow velocity of the flush water W21 supplied to the bowl section 21 is determined by the low-flow discharge outlet 431, which has a small flow path cross-sectional area S2. As a result, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, it is possible to prevent a decrease in the flow velocity of the flush water W22 supplied from the rim water conduit 43 (low-flow discharge outlet 431), and to prevent a decrease in the cleaning performance of the bowl section 21. On the other hand, when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate, the flow velocity of the flush water W21 supplied to the bowl section 21 is determined by the high-flow discharge outlet 432, which has a large flow path cross-sectional area S3. This prevents the flow rate of flush water W22 supplied from the rim water outlet 43 (high flow rate water outlet 432) from increasing too much when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate, and prevents flush water W from splashing out of the bowl portion 21.

Furthermore, by arranging the low-flow water outlet 431 upstream of the high-flow water outlet 432, it is possible to form the low-flow water outlet 431 and the high-flow water outlet 432 in the same flow path. When the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, flush water W22 is supplied from the low-flow water outlet 431 to the bowl section 21, preventing a decrease in the flow rate of flush water W21 supplied from the rim water outlet 43 (low-flow water outlet 431), and preventing a decrease in the cleaning performance of the bowl section 21. On the other hand, when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate, it prevents the flow rate of flush water W22 supplied from the rim water outlet 43 (high-flow water outlet 432) from increasing too much, preventing flush water W from splashing out of the bowl section 21.

Furthermore, the flow path cross-sectional area S1 of the rim water conduit 42 expands continuously and gradually as it moves from the low-flow water outlet 431 to the high-flow water outlet 432, including at least the downstream area A1 immediately adjacent to the low-flow water outlet 431. In other words, the flow path expands smoothly from the upstream low-flow water outlet 431 to the downstream high-flow water outlet 432. As a result, the flush water W21 flowing through the rim water conduit 42 from the low-flow water outlet 431 to the high-flow water outlet 432 is drawn to the inner surface of the rim water conduit 42 (Coanda effect), and the flush water W21 flows along the flow path shape of the rim water conduit 42, thereby preventing water shortages. This prevents a decrease in the flow rate of flush water W22 supplied from the rim water outlet 43 (low flow rate water outlet 431) when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, thereby preventing a decrease in the flushing performance of the bowl section 21.

Furthermore, because the rim water conduit has a stirring chamber 44 upstream of the low-flow water outlet, which has a larger flow path cross-sectional area than the low-flow water outlet, the flow of flush water W21 is turbulent in the stirring chamber 44, and the turbulent flow of flush water W21 flows into the low-flow water outlet 431, making the low-flow water outlet 431 more likely to be watertight. As a result, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, it is possible to prevent a decrease in the flow rate of flush water W22 supplied from the rim water outlet 43 (low-flow water outlet 431), and to prevent a decrease in the cleaning performance of the bowl section 21.

Furthermore, because the rim conduit 42 branches off from the main conduit 31 upstream of the jet conduit 51, the flow rate of the flush water W21 flowing into the rim conduit 42 does not affect the high-speed jet discharge, and the flow rate of the flush water W21 flowing from the main conduit 31 into the rim conduit 42 can be controlled by the pressure rate-controlling section 45. As a result, when the flush water W21 flowing through the rim conduit 42 is at a low flow rate, flush water W22 is supplied to the bowl section 21 from the low-flow discharge outlet 431, preventing a decrease in the flow rate of flush water W22 supplied from the rim discharge outlet 43 (low-flow discharge outlet 431), and preventing a decrease in the flushing performance of the bowl section 21. On the other hand, when the flush water W21 flowing through the rim water conduit 42 is at a high flow rate, the flow rate of the flush water W22 supplied from the rim water outlet 43 (high flow rate water outlet 432) can be prevented from increasing too much, and the flush water W can be prevented from splashing out of the bowl portion 21.

In addition, the flow path cross-sectional area S2 of the low flow rate water outlet 431 is larger than the flow path cross-sectional area S5 of the pressure rate-limiting section 45, and the flow path cross-sectional area S3 of the high flow rate water outlet 432 and the flow path cross-sectional area S4 of the stirring chamber 44 are each larger than the flow path cross-sectional area S2 of the low flow rate water outlet 431.This allows the pressure rate-limiting section 45 to determine the flush water distribution between the rim and jet water, and when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, the small flow path cross-sectional area S2 of the low flow rate water outlet 431 can limit the flow rate of the flush water W.

In addition, because the central axis L1 in the flow direction of the flush water W21 in the pressure rate-controlling section 45 is positioned higher than the central axis L2 in the flow direction of the flush water W21 in the low-flow rate water outlet 431, the flush water W21 accelerated in the pressure rate-controlling section 45 does not flow directly into the low-flow rate water outlet 431, but rather becomes turbulent and swirls in the stirring chamber 44 before flowing into the low-flow rate water outlet 431, making the low-flow rate water outlet 431 more likely to be watertight. As a result, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, it is possible to prevent a decrease in the flow rate of the flush water W22 supplied from the rim water outlet 43 (low-flow rate water outlet 431), and to prevent a decrease in the cleaning performance of the bowl section 21.

In addition, because the stirring chamber 44 has a wall portion 441 upstream of the low-flow water outlet 431, the flush water W21, which has increased in speed in the pressure-controlling section 45, collides with the wall portion 441 before flowing into the low-flow water outlet 431, causing the flow to become turbulent and swirling in the stirring chamber 44, making it easier for the low-flow water outlet 431 to become watertight. As a result, when the flush water W21 flowing through the rim water conduit 42 is at a low flow rate, it is possible to prevent a decrease in the flow rate of the flush water W22 supplied from the rim water outlet 43 (low-flow water outlet 431), and to prevent a decrease in the cleaning performance of the bowl section 21.

Further advantages and modifications may readily occur to those skilled in the art. Therefore, the invention in its broader aspects is not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.

DESCRIPTION OF SYMBOLS 1 Flush toilet 21 Bowl section 23 Trap section 31 Main waterway 41 Rim connection hole 42 Rim waterway 43 Rim outlet 431 Low flow outlet 432 High flow outlet 44 Mixing chamber 441 Wall section 45 Pressure-controlling section 51 Jet waterway 52 Jet outlet A1 Downstream region L Central axis S Flow path cross-sectional area W Flush water

Claims (7)

a bowl portion for receiving waste;
a trap portion extending from the bowl portion for discharging waste received in the bowl portion;
a main waterway through which cleaning water flows toward the bowl portion;
a rim connection hole into which wash water flows from the main waterway;
a rim water conduit through which the wash water flowing in from the rim connection hole flows;
a rim spout that supplies flush water flowing through the rim water conduit to the bowl portion ;
a small flow path section formed in the rim water conduit upstream of the rim water outlet and having a flow path cross-sectional area smaller than that of the rim water outlet;
Equipped with
The small flow path portion and the rim spout port are formed in the same flow path,
Between the downstream region of the small flow path section and the rim spout port, an inclined wall is formed in which the top surface is inclined upward as it goes downstream; and
Between the downstream region of the small flow path section and the rim spout port, an inclined wall is formed whose bottom surface is inclined downward as it goes downstream.
A flush toilet characterized by: 2. The flush toilet according to claim 1, wherein the rim water conduit has a flow path cross -sectional area that continuously and gradually increases from the small flow path section toward the rim spout, between the small flow path section and the rim spout, including at least the downstream region immediately adjacent to the small flow path section . 2. The flush toilet according to claim 1, wherein the rim water conduit has a stirring chamber, located upstream of the small flow path section , that has a larger flow path cross-sectional area than the small flow path section . A jet water channel through which wash water from the main water channel flows;
A jet water outlet that sprays the flush water that has flowed through the jet water conduit from the front of the trap section toward the trap section;
The flush toilet according to claim 1, further comprising a pressure-controlling section that connects the main conduit and the rim conduit upstream of the jet conduit. The rim water conduit has a stirring chamber upstream of the small flow path section ,
the small flow path portion has a larger flow path cross-sectional area than the pressure-limiting portion,
The flush toilet according to claim 4 , wherein the rim spout and the stirring chamber have a larger flow path cross-sectional area than the small flow path section . 5. The flush toilet according to claim 4 , wherein the pressure-controlling section has a central axis in the direction of flush water flow positioned above the central axis in the direction of flush water flow of the small flow path section . the rim water channel has a stirring chamber, upstream of the small flow path section , that has a flow path cross-sectional area larger than that of the small flow path section ;
The flush toilet according to claim 6 , wherein the stirring chamber has a wall portion upstream of the small flow path portion .