Water-washable toilet

Abstract

To provide a water closet capable of improving dirt discharge performance.SOLUTION: A water closet according to an embodiment has a bowl part, a water discharge part, a drain trap part, and a drain socket. The bowl part has a dirt receiving surface and a rim part. The water discharge part discharges washing water into the bowl part. The drain trap part is connected to a bottom of the bowl part and discharges the dirt in the bowl part. The drain socket is connected to the drain trap part on an upstream side and an exhaust port on a floor surface on a downstream side. The drain socket has a rear R part to change a channel so that the washing water from above flows forward, a front R part that is disposed on the downstream side of the rear R part and changes the channel so that the washing water from backward flows downward, and a water reservoir part to store a portion of the washing water at the channel from the rear R part to the front R part. The drain socket has a throttling part that is disposed on the downstream side of the front R part and reduces a channel cross-sectional area of the front R part.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION The disclosed embodiments relate to a flush toilet. [Background technology]

[0002] Conventionally, flush toilets are equipped with a drain socket that connects a drain trap, which discharges waste from the bowl, to a drain outlet on the floor. There are several types of drain sockets depending on the shape of the piping, and one known example is a so-called rear-swing drain socket, in which the upstream side is connected to the drain trap, and the downstream side is swung (extended) to the rear of the toilet bowl before extending toward the front and connecting to the drain outlet (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Patent No. 8,011,029 Summary of the Invention [Problem to be solved by the invention]

[0004] In the flush toilets described above, when the toilet is flushed, flush water fills the drain socket, causing a siphoning effect that expels waste. However, in flush toilets according to conventional technology, depending on the length of the drainage flow path in the drain socket, for example, the siphoning effect may not continue all the way to the downstream side of the drain socket, resulting in a decrease in waste discharge performance. As such, conventional technology leaves room for improvement in terms of improving waste discharge performance.

[0005] One aspect of the embodiment has been made in view of the above, and aims to provide a flush toilet that can improve waste discharge performance. [Means for solving the problem]

[0006] A flush toilet according to one aspect of the embodiment comprises a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface, a water discharge portion provided on the rim portion and discharging flush water into the bowl portion, a drain trap portion connected to the bottom of the bowl portion and discharging waste within the bowl portion, a drain socket connected at its upstream side to the drain trap portion and at its downstream side to a drain outlet on the floor surface, the drain socket having a rear R portion that changes the flow path so that flush water flowing from above is directed forward, a front R portion that is provided downstream of the rear R portion and changes the flow path so that flush water flowing from the rear is directed downward, and a water reservoir portion that stores some of the flush water in the flow path from the rear R portion to the front R portion, and the drain socket is characterized in that it comprises a throttle portion provided downstream of the front R portion and that reduces the flow path cross-sectional area of ​​the front R portion.

[0007] This improves the waste discharge performance of the flush toilet. By providing the throttle section downstream of the front curve, for example, when flushing the toilet, the direction of the flush water flowing through the front curve changes, making it easier for flush water to fill the area around the front curve and throttle section. Therefore, for example, by using flush water stored in the basin, the siphon action that occurs in the basin and upstream of the basin can be continuously generated within the drain socket without interruption until it reaches the basin downstream of the drain socket, i.e., the throttle section. By generating this siphon action, waste can be reliably discharged from the drain along with the flush water, thereby improving the waste discharge performance of the flush toilet.

[0008] The throttle portion is also characterized in that it is provided at a position lower than the lower end of the water reservoir portion.

[0009] This makes it possible to increase the flow rate (in other words, the water force) of flush water that flows from the water reservoir through the front curved section to the throttled section as it falls into the throttled section. Then, by changing the flow direction of the flush water whose flow rate has increased through the throttled section, flush water becomes more likely to fill the area around the front curved section and the throttled section, ensuring that siphon action occurs.

[0010] The radial center of the flow passage of the throttle portion is located forward of the radial center of the flow passage at the portion of the front R portion where the throttle portion is provided.

[0011] This prevents waste from stagnating within the drain socket, while allowing the siphon action to occur continuously within the drain socket, further improving the waste discharge performance of the flush toilet.

[0012] That is, for example, waste passing through the front curved section tends to flow forward near the downstream end due to the force of the flush water, etc. The throttle section is configured so that the center of the flow path is located forward of the center of the flow path of the front curved section, so that waste that has flowed forward near the downstream end can be smoothly discharged from the flow path of the throttle section. In other words, waste can be prevented from stagnating in the drain socket.

[0013] Furthermore, the throttle section described above makes it possible to change the flow direction of flush water flowing through the front curved section to the front when flushing the toilet (in other words, the flush water flowing through the throttle section has a vector pointing forward in the front-to-back direction), making it easier for flush water to fill the front curved section and the area around the throttle section. This makes it possible for the siphon action to occur continuously within the drain socket without being interrupted downstream of the drain socket, i.e., up to the throttle section, further improving the waste discharge performance of the flush toilet.

[0014] The throttle portion is characterized in that it has an opening that forms a flow path, and the opening has an inclined surface that is formed on the inner circumferential surface and slopes downward toward the downstream side.

[0015] This makes it easier for flushing water and waste passing through the opening of the throttle section to flow downstream along the inclined surface, for example, when flushing the toilet, thereby further preventing waste from stagnating in the drain socket.

[0016] The throttle portion is also characterized by having a rib for guiding waste downstream.

[0017] This allows waste that reaches the vicinity of the throttle section, for example, when flushing the toilet, to be guided by the ribs and flow more easily downstream, further preventing waste from accumulating inside the drain socket.

[0018] The throttle portion is characterized by including an opening that forms a flow path, and a protrusion that protrudes from an inner circumferential surface of the opening toward the flow path side of the opening.

[0019] As a result, for example, when flushing the toilet, some of the flush water that reaches the vicinity of the throttle section will also collide with the protruding section. Therefore, a relatively large amount of flush water can be redirected at the throttle section, making it easier for flush water to fill the front curved section and the vicinity of the throttle section. This allows the siphon action to occur continuously within the drain socket without interruption downstream of the drain socket, i.e., all the way to the throttle section, thereby further improving the waste discharge performance of the flush toilet. [Effects of the Invention]

[0020] According to one aspect of the embodiment, it is possible to improve waste discharge performance. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a side cross-sectional view showing a flush toilet according to an embodiment. [Figure 2] FIG. 2 is an enlarged cross-sectional view of the drain socket. [Figure 3]FIG. 3 is an enlarged cross-sectional view of the vicinity of the throttle portion. [Figure 4] FIG. 4 is a perspective view of the narrowed portion and the front R portion as viewed from below. [Figure 5] FIG. 5 is a perspective view of the throttle portion. [Figure 6] FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. [Figure 7] FIG. 7 is an enlarged cross-sectional view of the vicinity of the throttle portion according to the first modified example. [Figure 8] FIG. 8 is a perspective view of the narrowed portion and the front R portion according to the first modified example, as viewed from below. [Figure 9] FIG. 9 is a perspective view of a throttle portion according to a first modified example. [Figure 10] FIG. 10 is a cross-sectional view of the front R portion to which the throttle portion according to the second modification is attached. [Figure 11] FIG. 11 is an enlarged cross-sectional view of a drain socket according to a third modified example. DETAILED DESCRIPTION OF THE INVENTION

[0022] Embodiments of the flush toilet disclosed in this application will be described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below.

[0023] (Embodiment) <Overall configuration of a flush toilet> First, the overall structure of a flush toilet 1 according to an embodiment will be explained with reference to Figure 1. Figure 1 is a side cross-sectional view showing a flush toilet 1 according to an embodiment. Note that, to make the explanation easier to understand, Figure 1 illustrates a three-dimensional Cartesian coordinate system that includes a Z-axis with the positive direction being the upward vertical direction. This Cartesian coordinate system may also be illustrated in other figures.

[0024] In the following description, the positive X-axis direction in the Cartesian coordinate system may be referred to as "rightward," the negative X-axis direction as "leftward," the positive Y-axis direction as "forward," the negative Y-axis direction as "backward," the positive Z-axis direction as "upward," and the negative Z-axis direction as "downward." Note that all of the figures shown in Figure 1 and Figure 2 onwards are schematic diagrams.

[0025] As shown in Figure 1, flush toilet 1 comprises a bowl section 2, a spout section 3, a drain trap section 4, and a drain socket 5. Furthermore, flush toilet 1 is a floor-standing flush toilet. The toilet body including bowl section 2 etc. is made of ceramic, for example, but is not limited to this and could be made of resin, for example, or a combination of ceramic and resin.

[0026] Bowl portion 2 includes waste receiving surface 21 and rim portion 22. Waste receiving surface 21 is formed in a bowl shape capable of receiving waste. Rim portion 22 is formed above waste receiving surface 21 and is formed to form the upper edge of bowl portion 2. Note that in Figure 1, for the sake of simplicity, some components such as the toilet seat provided on top of bowl portion 2 and the cover that covers the toilet seat are not shown.

[0027] The water discharger 3 discharges flush water into the bowl section 2. For example, the water discharger 3 is provided on the rim section 22, and discharges flush water supplied from a water storage tank (not shown) into the bowl section 2 through a water discharge port. Note that in Figure 1, for simplicity of illustration, the water discharger 3 (water discharge port) is shown schematically by a two-dot chain line.

[0028] Flush water discharged from the water discharge section 3 generates a swirling flow, for example, on the waste receiving surface 21 of the bowl section 2, thereby cleaning the bowl section 2. After flushing the toilet, the flush water supplied to the bowl section 2 is stored in the bowl section 2 and the drain trap section 4. In FIG. 1, the flush water stored in the bowl section 2 and the drain trap section 4 is shown by a two-dot chain line, and hereinafter this flush water will be referred to as stored water W T In this way, the drain trap part 4 etc. T By filling it with water, Tfunctions as a water seal, preventing odors and the like from flowing back into the bowl portion 2 from the drainage pipe 61 described later.

[0029] The configuration of the drain trap section 4 will be described. The drain trap section 4 is connected to the bottom 2a of the bowl section 2, and discharges waste together with flush water from within the bowl section 2. More specifically, the drain trap section 4 includes an inlet section 41, an ascending pipe line 42, and a descending pipe line 43.

[0030] The inlet portion 41 is connected to and continues below the waste receiving surface 21 of the bowl portion 2, and allows flush water and waste from the bowl portion 2 to flow into the drain trap portion 4. The rising pipe 42 is connected to the inlet portion 41 and is formed to extend diagonally rearward and upward from the downstream end of the inlet portion 41. The descending pipe 43 is connected to the rising pipe 42 and is formed to extend downward from the downstream end of the rising pipe 42. Furthermore, the drain socket 5 is connected to the downstream end of the descending pipe 43.

[0031] Therefore, in the drain trap section 4, when the toilet is flushed, flush water and waste in the bowl section 2 are discharged into the drain socket 5 through the inlet section 41, the ascending pipe line 42 and the descending pipe line 43.

[0032] <Drainage socket configuration> Next, we will explain the drain socket 5. The drain socket 5 discharges flushing water and waste from the drain trap section 4 into the drain pipe 61. For example, the upstream side of the drain socket 5 is connected to the drain trap section 4 (more precisely, the descending pipe 43 of the drain trap section 4) and the downstream side is connected to the drain outlet 62 in the floor surface F, and therefore flushing water and the like from the drain trap section 4 is discharged into the drain pipe 61.

[0033] Furthermore, as described above, the drain socket 5 is a so-called rear-swing drain socket, in which the upstream side is connected to the drain trap section 4, and the downstream side is once swung toward the rear of the toilet bowl (negative direction of the Y axis) and then extends toward the front of the toilet bowl (positive direction of the Y axis) to connect to the drain outlet 62.

[0034] Incidentally, in the flush toilet 1 described above, when the toilet is flushed, for example, the drain socket 5 is filled with flush water, causing a siphoning action that expels waste. However, if the drain socket 5 is, for example, a swing-back drain socket, the length of the drainage flow path of the drain socket 5 (for example, the length L of the drainage flow path in the front-to-back direction (Y-axis direction) shown in Figure 1) is likely to be relatively long. As a result, in the flush toilet 1, the siphoning action may cease before it reaches the downstream side of the drain socket 5; in other words, the siphoning action is unlikely to continue all the way to the downstream side of the drain socket 5, resulting in a decline in discharge performance. Note that the phenomenon of the siphoning action being unlikely to continue all the way to the downstream side of the drain socket 5 can occur in other cases as well.

[0035] Therefore, in this embodiment, a configuration is adopted that can improve the waste discharge performance. This configuration will be specifically described below with reference to Figure 2. Figure 2 is an enlarged cross-sectional view of the drain socket 5.

[0036] 1 and 2, the drain socket 5 includes a vertical pipe 51, a rear curved portion 52, a horizontal pipe 53, a front curved portion 54, a water reservoir portion 55, and a throttle portion 56. The drain socket 5 is made of resin, but is not limited to this.

[0037] The vertical pipe 51 is a pipe that extends vertically (in the Z-axis direction) and allows flush water that has flowed in from above to flow downward. For example, as shown in FIG. 2, the vertical pipe 51 has an upstream end 51a connected to the drain trap section 4 (more precisely, the descending pipe 43 of the drain trap section 4) and a downstream end 51b connected to the rear curved section 52.

[0038] An intermediate portion 51c is formed between the upstream end 51a and the downstream end 51b. This intermediate portion 51c is formed so as to bend rearward (in the negative direction of the Y-axis), which causes the flow path in the vertical pipe 51 to swing rearward. This makes it easier for flush water to fill the area near the bent part of the vertical pipe 51 in the drain socket 5, thereby making it easier to generate a siphon effect.

[0039] The rear curved section 52 is a pipe that is located at the rear of the flush toilet 1 and changes the flow path so that flush water flowing from above is directed forward. For example, the upstream end 52a of the rear curved section 52 is connected to the vertical pipe 51 (more precisely, the downstream end 51b of the vertical pipe 51), and the downstream end 52b is connected to the horizontal pipe 53.

[0040] A curved portion 52c is formed between the upstream end 52a and the downstream end 52b. The curved portion 52c is formed to bend forward, thereby changing the flow path of the cleaning water flowing from above into a flow path going forward.

[0041] The horizontal pipe 53 is a pipe that extends in the front-to-rear direction (Y-axis direction) and directs flush water flowing from the rear to the front. For example, the upstream end 53a of the horizontal pipe 53 is connected to the rear curved portion 52 (more precisely, the downstream end 52b of the rear curved portion 52), and the downstream end 53b is connected to the front curved portion 54.

[0042] An intermediate portion 53c is formed between the upstream end portion 53a and the downstream end portion 53b. The intermediate portion 53c is formed to extend in the front-to-rear direction, and therefore flush water flowing from the rear is directed forward.

[0043] The front curved section 54 is located on the front side of the flush toilet 1 (positive direction of the Y axis), in other words downstream of the rear curved section 52, and is a pipe that changes the flow path so that flush water flowing from the rear is directed downward. For example, the upstream end 54a of the front curved section 54 is connected to the horizontal pull-out pipe 53 (more precisely, the downstream end 53b of the horizontal pull-out pipe 53), and the downstream end 54b is connected to the drain outlet 62 of the drainage pipe 61 via the throttle section 56.

[0044] An ascending portion 54c and a descending portion 54d are formed between the upstream end 54a and the downstream end 54b. The ascending portion 54c is connected to the upstream end 54a and is formed to extend obliquely upward and forward from the upstream end 54a. The descending portion 54d is connected to the ascending portion 54c and is formed to extend downward from the downstream side of the ascending portion 54c. In this way, by forming the ascending portion 54c and the descending portion 54d to be curved, the front curved portion 54 changes the flow path of flush water flowing from the rear into a downward flow path.

[0045] Furthermore, in the drain socket 5, the front curved portion 54 has an ascending portion 54c formed so as to extend obliquely forward and upward, so that a water reservoir 55 is formed in the flow path from the rear curved portion 52 to the front curved portion 54. In FIG. 2, the flush water stored in the water reservoir 55 is indicated by a two-dot chain line, and such flush water will be referred to below as stored water W a It may be written as follows.

[0046] In this way, in the drain socket 5, the stored water W a For example, when flushing the toilet, the stored water W a By using this, the inside of the pipe can be filled with a relatively small amount of flushing water, thereby enabling the siphoning action to occur early.

[0047] Next, the narrowed portion 56 will be described with reference to Figures 3 to 6. Figure 3 is an enlarged cross-sectional view of the vicinity of the narrowed portion 56. Figure 4 is a perspective view of the narrowed portion 56 and the front R portion 54 as viewed from below. Figure 5 is a perspective view of the narrowed portion 56, and Figure 6 is a cross-sectional view taken along line VI-VI in Figure 3.

[0048] As shown in Figure 3 and other figures, the throttle section 56 is a component that is provided downstream of the front curved section 54 and reduces the cross-sectional area of ​​the flow path of the front curved section 54. In the drain socket 5 according to this embodiment, the provision of the throttle section 56 makes it possible to improve the discharge performance of the flush toilet 1.

[0049] More specifically, as shown in FIGS. 3 to 6, the narrowed portion 56 includes a bottom surface portion 56a, an opening portion 56b, a side wall portion 56c (not visible in FIG. 4), and a locking portion 56d.

[0050] The bottom surface portion 56a is formed in a plate shape, in other words, in a disk shape. The opening portion 56b is formed in the bottom surface portion 56a and forms a flow path in the throttle portion 56. For example, the opening portion 56b is formed in a circular shape. Note that the shape of the opening portion 56b is not limited to a circular shape and may be other types of shapes, such as an elliptical shape.

[0051] 3 and 6, the opening area of ​​the opening 56b of the throttle portion 56 is set to be smaller than the opening area of ​​the opening 54e (more precisely, the opening 54e of the downstream end 54b) of the front curved portion 54. Here, the opening area of ​​the opening 56b of the throttle portion 56 corresponds to the flow path cross-sectional area of ​​the flow path in the throttle portion 56, and the opening area of ​​the opening 54e of the front curved portion 54 corresponds to the flow path cross-sectional area of ​​the flow path in the front curved portion 54.

[0052] Therefore, by providing the throttle portion 56 having the above-described bottom surface portion 56a and opening 56b downstream of the front curved portion 54, the flow path cross-sectional area of ​​the front curved portion 54 is reduced. In other words, the throttle portion 56 is provided so as to partially cover the opening 54e of the front curved portion 54, that is, so as to narrow a part of the flow path of the front curved portion.

[0053] As a result, for example, when flushing the toilet, flush water flowing through the front curved portion 54 collides with the bottom surface portion 56a and changes direction as shown by arrow A in FIG. 3, and as a result, flush water tends to fill the area around the front curved portion 54 and the throttle portion 56. Therefore, for example, when the water pool 55 is filled with stored water W aBy utilizing this, it is possible to cause the siphon action that occurs in the water reservoir 55 and upstream of the water reservoir 55 to occur continuously within the drain socket 5 without interruption all the way to the downstream side of the drain socket 5, i.e., the throttle section 56. In this embodiment, by causing this siphon action, it is possible to reliably discharge waste together with flush water from the drain outlet 62 (see Figure 2), thereby improving the waste discharge performance of the flush toilet 1.

[0054] Furthermore, the throttle section 56 is formed so that the flow path cross-sectional area at the opening 56b is the smallest in the entire flow path of the front curved section 54. This makes it possible to reliably change the flow direction of flush water flowing through the front curved section 54, for example, when flushing the toilet, and as a result, flush water is more likely to fill the area around the front curved section 54 and the throttle section 56. This makes it possible for the siphon action to occur continuously within the drain socket 5 without being interrupted up to the throttle section 56 of the drain socket 5, thereby further improving the waste discharge performance of the flush toilet 1. Note that, although the flow path cross-sectional area of ​​the throttle section 56 is set to be the smallest in the entire flow path of the front curved section 54 in the above description, this is not limited to this.

[0055] Furthermore, throttle section 56 is provided at a position lower than bottom end 55d of water pool section 55 (see FIG. 2). More specifically, throttle section 56 is provided in front curved section 54 such that opening 56b forming a flow path is located lower than bottom end 55d of water pool section 55. In other words, throttle section 56 is provided so as to create a water level difference between opening 56b and bottom end 55d of water pool section 55 such that the position of opening 56b is lower than the position of bottom end 55d.

[0056] This makes it possible to increase the flow rate (in other words, the water force) of flush water flowing from the water pool 55 through the front curved portion 54 to the throttled portion 56, for example, as it falls into the throttled portion 56. Then, by changing the flow direction of the flush water whose flow rate has increased by using the throttled portion 56, flush water becomes more likely to fill the areas around the front curved portion 54 and the throttled portion 56, thereby ensuring that the siphoning action occurs.

[0057] 3 and 6, the narrowed portion 56 is formed so as to close the rear side of the opening 54e of the front curved portion 54. More specifically, the narrowed portion 56 is formed so as to open the front side (positive direction of the Y axis) of the opening 54e of the front curved portion 54 with the opening 56b and to close the rear side (negative direction of the Y axis) of the opening 54e of the front curved portion 54 with the bottom surface portion 56a.

[0058] More specifically, a radial center 56x of the flow path of the throttle portion 56 is located forward of a radial center 54x of the flow path at the portion (i.e., the downstream end 54b) where the throttle portion 56 is provided in the front curved portion 54. In other words, a radial center 56x of the opening 56b of the throttle portion 56 is located a predetermined distance Y (see FIG. 3) forward of a radial center 54x of the opening 54e of the front curved portion 54. Note that the predetermined distance Y can be set to any value.

[0059] This prevents waste from stagnating inside the drain socket 5, while allowing the siphon action to occur continuously within the drain socket 5, further improving the waste discharge performance of the flush toilet 1.

[0060] That is, for example, waste passing through the front curved portion 54 is likely to flow forward near the downstream end 54b due to the force of the flush water, etc. The throttled portion 56 according to this embodiment is configured so that the center 56x of the flow path is located forward of the center 54x of the flow path of the front curved portion 54, and therefore waste that has flowed forward near the downstream end 54b, for example, can be smoothly discharged from the flow path of the throttled portion 56 (more specifically, the opening 56b); in other words, waste can be prevented from stagnating inside the drain socket 5.

[0061] Furthermore, the above-mentioned throttle section 56 makes it possible to change the flow direction of flush water flowing through the front curved section 54 to the front, for example, when flushing the toilet (in other words, the flush water flowing through the throttle section 56 has a vector pointing forward in the front-to-back direction), making it easier for flush water to fill the area around the front curved section 54 and throttle section 56. As a result, in this embodiment, the siphon action can occur continuously within the drain socket 5 without being interrupted all the way to the downstream side of the drain socket 5, i.e., the throttle section 56, and the waste discharge performance of the flush toilet 1 can be further improved.

[0062] As shown in FIGS. 3 and 5, the opening 56b of the throttle portion 56 has an inclined surface 56e. The inclined surface 56e is formed on an inner circumferential surface 56b1 of the opening 56b. More specifically, the inclined surface 56e is formed around the entire upstream edge (upper edge) of the inner circumferential surface 56b1 of the opening 56b. Note that in the above description, the inclined surface 56e is formed around the entire edge of the inner circumferential surface 56b1 of the opening 56b, but this is not limiting and the inclined surface 56e may be formed on a part of the edge, for example.

[0063] In addition, inclined surface 56e is formed to slope downward toward the downstream side (i.e., toward the negative Z-axis direction), which makes it easier for flush water and waste passing through opening 56b of throttle section 56 to flow downstream along inclined surface 56e, thereby further preventing waste from stagnating inside drain socket 5.

[0064] Continuing with the description of the drawn portion 56, the side wall portion 56c of the drawn portion 56 is provided upright from the outer peripheral edge of the bottom surface portion 56a, as shown in FIGS. 3 and 5. The front curved portion 54 is formed with a groove portion 54f (see FIG. 3) at a position corresponding to the side wall portion 56c, into which the side wall portion 56c can be inserted. When the drawn portion 56 is attached to the front curved portion 54, the side wall portion 56c of the drawn portion 56 is inserted into the groove portion 54f of the front curved portion 54. As a result, the drawn portion 56 is positioned relative to the front curved portion 54 and attached.

[0065] The locking portion 56d is a portion that locks with the front curved portion 54. For example, a plurality of (e.g., three) locking portions 56d are formed on the side wall portion 56c. Note that the number of locking portions 56d described above is merely an example and is not limited thereto. Furthermore, the locking portions 56d may be formed by, for example, snap fittings having locking claws 56d1, but are not limited thereto.

[0066] Furthermore, locking holes 54g that function as locked portions are formed in the front curved portion 54 at positions corresponding to the locking portions 56d (see FIGS. 3, 4, and 6). When the narrowed portion 56 is attached to the front curved portion 54, the locking claws 56d1 of the locking portions 56d lock into the locking holes 54g (for example, by elastic deformation and getting caught), thereby fixing the narrowed portion 56 to the front curved portion 54.

[0067] In the above description, the narrowed portion 56 is fixed to the front curved portion 54 using the locking portions 56d and the like, but this is not limited to this. That is, the narrowed portion 56 may be fixed to the front curved portion 54 using an adhesive or the like in addition to or instead of the locking portions 56d and the like.

[0068] Furthermore, in the above example, the narrowed portion 56 and the front R portion 54 are separate bodies, but this is not limiting, and for example, the front R portion 56 and the front R portion 54 may be formed integrally.

[0069] As described above, the flush toilet 1 according to this embodiment comprises a bowl portion 2, a water spout portion 3, a drain trap portion 4, and a drain socket 5. The bowl portion 2 has a bowl-shaped waste receiving surface 21 and a rim portion 22 formed above the waste receiving surface. The water spout portion 3 is attached to the rim portion 22 and ejects flush water into the bowl portion 2. The drain trap portion 4 is connected to the bottom portion 2a of the bowl portion 2 and discharges waste from within the bowl portion 2. The upstream side of the drain socket 5 is connected to the drain trap portion 4 and the downstream side is connected to a drain outlet 62 in the floor surface F. The drain socket 5 has a rear curved portion 52 that changes the flow path of flush water flowing from above so that it heads forward, a front curved portion 54 that is attached downstream of the rear curved portion 52 and changes the flow path of flush water flowing from the rear so that it heads downward, and a water reservoir portion 55 that stores some of the flush water in the flow path from the rear curved portion 52 to the front curved portion 54.

[0070] The drain socket 5 also includes a throttle portion 56 that is provided downstream of the front R portion 54 and reduces the flow path cross-sectional area of ​​the front R portion 54. This allows the present embodiment to improve waste discharge performance.

[0071] (First Modification) Next, a first modified example will be described with reference to Figures 7 to 9. Figure 7 is an enlarged cross-sectional view of the vicinity of the narrowed portion 56 according to the first modified example. Figure 8 is a perspective view of the narrowed portion 56 and the front R portion 54 according to the first modified example when viewed from below. Figure 9 is a perspective view of the narrowed portion 56 according to the first modified example. Note that, in the following, components common to the above-described embodiment will be assigned the same reference numerals and descriptions thereof will be omitted.

[0072] As shown in FIGS. 7 to 9, the throttle portion 56 according to the first modified example includes a rib 56g (not visible in FIG. 8) and a locking projection 56h.

[0073] As shown in FIGS. 7 and 9, the ribs 56g are portions that guide waste downstream. For example, the ribs 56g are provided standing upward from the upper surface 56a1 of the bottom surface portion 56a. A plurality of ribs 56g (for example, three) are formed on the bottom surface portion 56a at positions that close the rear side of the opening 54e of the front curved portion 54. As shown in FIG. 9, the plurality of ribs 56g are formed so as to be spaced apart from each other by a predetermined distance in the left-right direction (X-axis direction). Note that the number of the plurality of ribs 56g described above (three) is merely an example and is not limited thereto; for example, the number may be two, four, or more. The number of ribs 56g may also be one.

[0074] Each of the ribs 56g has an inclined surface 56g1 formed thereon. The inclined surface 56g1 is formed on a portion of the rib 56g on the opening 56b side. The inclined surface 56g1 is formed to slope downward toward the downstream side (i.e., the negative Z-axis direction).

[0075] In the first modified example, by providing the rib 56g described above on the throttle portion 56, for example, when flushing the toilet, waste that reaches the vicinity of the throttle portion 56 is guided by the rib 56g and tends to flow downstream (see arrow B in FIG. 7). More specifically, waste that reaches the vicinity of the throttle portion 56 tends to flow downstream along the inclined surface 56g1 of the rib 56g. Therefore, in the first modified example, waste can be further prevented from stagnating inside the drain socket 5.

[0076] Furthermore, because the multiple ribs 56g are formed at a distance from one another on the bottom surface 56a, some of the flush water that reaches the vicinity of the throttle section 56 passes between the multiple ribs 56g and hits the bottom surface 56a. Therefore, in the first modified example, even when the ribs 56g are provided, the flow direction of the flush water flowing through the front curved section 54 can be changed, for example, forward, as in the embodiment, making it easier for flush water to fill the area around the front curved section 54 and the throttle section 56. Therefore, even in the first modified example, the siphon action can be continuously generated within the drain socket 5 without being interrupted downstream of the drain socket 5, i.e., up to the throttle section 56, and the waste discharge performance of the flush toilet 1 can be further improved.

[0077] The locking projections 56h are portions that lock onto the front curved portion 54. For example, a plurality of (e.g., two) locking projections 56h are formed so as to protrude laterally from the side wall portion 56c. Note that the number of locking projections 56h described above is merely an example and is not limited thereto.

[0078] Furthermore, a locked portion 54h is formed in the front curved portion 54 at a position corresponding to the locking protrusion 56h (see FIGS. 7 and 8). The locked portion 54h includes an insertion hole 54g1 and a locking hole 54g2. The insertion hole 54g1 opens downward, and the locking protrusion 56h is first inserted into the insertion hole 54g1 when the throttle portion 56 is attached. The locking hole 54g2 communicates with the insertion hole 54g1 and is configured to be able to lock the locking protrusion 56h inserted into the insertion hole 54g1.

[0079] Therefore, when the narrowing portion 56 is attached to the front R portion 54, the locking protrusion 56h is inserted into the insertion hole 54g1, and then the narrowing portion 56 is rotated around the vertical direction, and the locking protrusion 56h locks (gets caught) in the locking hole 54g2, thereby fixing the narrowing portion 56 to the front R portion 54.

[0080] (Second Modification) Next, a second modified example will be described with reference to Fig. 10. Fig. 10 is a cross-sectional view of the front R portion 54 to which the narrowed portion 56 according to the second modified example is attached, and is a cross-sectional view similar to Fig. 3.

[0081] 10, the narrowed portion 56 according to the second modification is configured to cover a larger area of ​​the opening 54e of the front R portion 54 than in the embodiment. Specifically, the narrowed portion 56 according to the second modification includes a protrusion 56i.

[0082] The protrusion 56i is formed to protrude from the inner circumferential surface 56b1 of the opening 56b toward the flow path side of the opening 56b. For example, the protrusion 56i is formed to extend from the inner circumferential surface 56b1 of the opening 56b along the center line C of the opening 56b.

[0083] In this way, in the second modified example, by providing the constricted section 56 with the protruding section 56i described above, for example, when flushing the toilet, some of the flush water that reaches the vicinity of the constricted section 56 will collide with the protruding section 56i in addition to the bottom surface section 56a. This makes it possible to change the flow direction of a relatively large amount of flush water, for example, forward, making it even more likely that flush water will fill the area around the front curved section 54 and the constricted section 56. Therefore, in the second modified example, it is possible for the siphon action to occur continuously within the drain socket 5 without being interrupted downstream of the drain socket 5, i.e., all the way to the constricted section 56, and therefore the waste discharge performance of the flush toilet 1 can be further improved.

[0084] The protrusion 56i is formed so that its width in the left-right direction (X-axis direction) decreases toward the tip 56i1. In other words, the protrusion 56i is formed in a tapered shape in cross section (top view) such that its width in the left-right direction decreases from the base end 56i2 toward the tip 56i1.

[0085] This makes it possible to prevent waste from stagnating inside the drain socket 5, even when the throttle portion 56 according to the second modification includes the protrusion 56i. That is, the protrusion 56i according to the second modification is formed so that its width decreases toward the tip 56i1, and therefore it is possible to make the maximum opening width D of the opening 56b of the throttle portion 56 as large as possible. In this way, by increasing the maximum opening width D of the opening 56b, waste can pass through the opening 56b (i.e., the flow path of the throttle portion 56), even when the throttle portion 56 includes the protrusion 56i, and therefore it is possible to prevent waste from stagnating inside the drain socket 5.

[0086] (Third Modification) Next, a third modified example will be described with reference to Fig. 11. Fig. 11 is an enlarged cross-sectional view of the drain socket 5 according to the third modified example. As shown in Fig. 11, the drain socket 5 according to the third modified example has multiple horizontal pipes 53 connected to it. In the example of Fig. 11, the horizontal pipes 53 include a first horizontal pipe 153 and a second horizontal pipe 253 connected to the first horizontal pipe 153.

[0087] In this way, in the third variant, by connecting multiple horizontal pipes 53 (here, the first and second horizontal pipes 153, 253), the length of the drain socket 5 in the front-to-back direction (Y-axis direction) can be adjusted depending on, for example, the position of the drain pipe 61.

[0088] Although FIG. 11 shows an example in which two horizontal pipes 53 are connected, the present invention is not limited to this, and for example, three or more horizontal pipes 53 may be connected.

[0089] Further advantages and modifications will 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. [Explanation of symbols]

[0090] 1 flush toilet 2 Bowl section 3. Water outlet 4 Drain trap section 5 drain socket 21 Waste receiving surface 22 Rim 52 Rear R section 54 Front R section 55 Water reservoir 56 Constriction section

Claims

1. a bowl portion having a bowl-shaped waste receiving surface and a rim portion formed above the waste receiving surface; a water discharge portion provided in the rim portion and discharging flush water into the bowl portion; a drain trap portion connected to the bottom of the bowl portion and configured to discharge waste from the bowl portion; a drain socket whose upstream side is connected to the drain trap section and whose downstream side is connected to a drain outlet on the floor surface, the drain socket having a rear R section that changes the flow path so that flush water flowing from above heads forward, a front R section that is provided downstream of the rear R section and changes the flow path so that flush water flowing from the rear heads downward, and causes the flush water to flow from an opening provided downstream to the drain outlet, and a water reservoir section that stores some of the flush water in the flow path from the rear R section to the front R section; Equipped with The drain socket is a throttle portion provided downstream of the front R portion and configured to reduce the cross-sectional area of ​​the flow path of the front R portion; Equipped with The throttle portion is a bottom surface portion formed in a plate shape and configured to close the rear side of the opening of the front R portion; a throttle portion side opening formed to open the front side of the opening of the front R portion; and disposed at a position higher than the floor surface. A flush toilet characterized by:

2. The throttle portion is The water reservoir is provided at a position lower than the lower end of the water reservoir.

2. The flush toilet according to claim 1.

3. The radial center of the flow path of the throttle portion is The front curved portion is located forward of the radial center of the flow passage at the portion where the throttle portion is provided.

3. The flush toilet according to claim 1 or 2.

4. The throttle portion is Openings that form flow paths Equipped with The opening is An inclined surface formed on the inner circumferential surface that slopes downward toward the downstream side The flush toilet according to any one of claims 1 to 3, characterized in that it comprises:

5. The throttle portion is Ribs that guide waste downstream The flush toilet according to any one of claims 1 to 4, characterized in that it comprises:

6. The throttle portion is an opening forming a flow path; a protruding portion protruding from an inner circumferential surface of the opening toward the flow path side of the opening; The flush toilet according to any one of claims 1 to 5, characterized in that it comprises:

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