Drain socket and siphon-type water closet provided with the same

Abstract

To provide a siphon-type water closet capable of improving the turning performance of large waste in a drainage line of a drain socket and preventing clogging of the waste.SOLUTION: A drain socket 1 of the present invention comprises: a vertical pipe 18 connected to a bowl-side drain port 12e and forming a flow path extending in a vertical direction; a connection pipe 20 forming a flow path that extends vertically downward from an upstream end 20a connected to the vertical pipe and then bends toward a downstream end 20b in a horizontal direction; and a horizontal pipe 22 including an upstream end 22a connected to the connection pipe and a downstream end 22b connected to a floor-side drain port D0 whose centers O1 and O2 are eccentrically positioned relative to the bowl-side drain port 12e. A flow path cross-sectional area S1 of an intermediate portion of the connection pipe is set larger than respective flow path cross-sectional areas S1 and S2 of the vertical pipe and the horizontal pipe.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a drain socket and a siphon flush toilet equipped with it, and in particular to a drain socket that connects the toilet-side drain outlet and floor-side drain outlet of a siphon flush toilet, and a siphon flush toilet equipped with it. [Background technology]

[0002] BACKGROUND ART Conventionally, drain sockets that connect the toilet-side drain outlet and floor-side drain outlet of a siphon-type flush toilet are known, for example, from those described in Patent Documents 1 and 2. First, in the conventional drain socket described in Patent Document 1, the middle part of the vertical pipe connected to the descending pipe of the drain trap part of the toilet body is formed so as to bend backward, making it easier for flushing water to fill around this bent point, making it easier to generate a siphon action. In addition, in the conventional drain socket described in Patent Document 2, a protrusion is provided in the flow path of the curved pipe section connecting the downcomer pipe section and the adjuster pipe section as a siphon induction section to generate a siphon action. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2023-67278 [Patent Document 2] Patent Publication No. 2021-85253 Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, with the recent trend toward water-saving siphon flush toilets, an important issue has become how to increase the efficiency of the siphon action in the drain trap pipe and the drain socket downstream of it, while minimizing the amount of water wasted up until the siphon action occurs and ensuring that it occurs early. However, in the conventional drain socket described above, the size of the flow path cross section of the internal flow path is partially reduced, making it more likely for a siphon action to occur, but if long or large pieces of waste are contained in the drainage, there is a problem that there is not enough space for these pieces of waste to turn around, and there is a risk of the waste clogging.

[0005] Therefore, the present invention has been made to solve the problems and issues of the prior art mentioned above, and aims to provide a drain socket that can improve the turning ability of long waste within the drain pipe of the drain socket and prevent waste from clogging, and a siphon-type flush toilet equipped with the same. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a drain socket that connects the toilet-side drain outlet and floor-side drain outlet of a siphon-type flush toilet, comprising: a vertical pipe that is connected to the toilet-side drain outlet and forms a flow path that extends vertically; a connecting pipe that forms a flow path that extends vertically downward from an upstream end connected to the vertical pipe and then bends toward a horizontal downstream end; and a horizontal pipe that includes an upstream end connected to the connecting pipe and a downstream end connected to the floor-side drain outlet, the centers of which are eccentric to the toilet-side drain outlet, and the cross-sectional area of the flow path along the connecting pipe is set larger than the cross-sectional areas of the vertical pipe and the horizontal pipe. In the present invention configured in this manner, wastewater containing sewage discharged from the toilet-side drain outlet of the siphon-type flush toilet into the drain socket flows down the vertical pipe of the drain socket, into the connecting pipe, and then passes through the horizontal pipe and is discharged from the floor-side drain outlet. In particular, when long, large pieces of sewage flow vertically downward from the vertical pipeline into the connecting pipeline along with the wastewater, after moving vertically downward within the connecting pipeline, they pass through an intermediate flow path in the connecting pipeline, and because the flow path cross-sectional area of the intermediate flow path in the connecting pipeline is set larger than the flow path cross-sectional areas of the vertical pipeline and the horizontal pipeline, they can easily turn toward the horizontal pipeline along with the flow of wastewater along the flow path that extends vertically downward in the connecting pipeline and then bends toward the horizontal pipe. The long waste matter is then turned around in the connecting pipeline so as to be directed towards the horizontal pipeline, and after passing through the horizontal pipeline, is discharged from the floor-side drain outlet. As a result, by setting the flow path cross-sectional area of the intermediate flow path of the connecting pipeline to be larger than the flow path cross-sectional area of each of the vertical pipeline and the horizontal pipeline, it was possible to improve the turning ability of long sewage within the connecting pipeline and thereby improve the sewage discharge performance.

[0007] In the present invention, preferably, the intermediate flow path of the connecting pipeline forms a first bent flow path including an upper bent surface and a lower bent surface facing each other above and below in the flow path radial direction so that the flow path cross-sectional area is larger than the flow path cross-sectional areas of the vertical pipeline and the horizontal pipeline, and the downstream end of the lower bent surface is located upstream of the flow path central axis of the vertical pipeline in a side view, and the bottom surface of the flow path downstream of the downstream end of the lower bent surface in the connecting pipeline forms an approximately horizontal surface. In the present invention configured in this manner, the downstream end of the downward bent surface of the first bent flow path in the connecting pipeline is located upstream of the flow path center axis of the vertical pipeline in a side view, so that the flow path cross-sectional area of the first bent flow path can be made larger than the flow path cross-sectional areas of the vertical pipeline and the horizontal pipeline. As a result, long sewage that flows vertically downward from the vertical pipeline into the connecting pipeline along with wastewater can be sufficiently turned toward the horizontal pipeline within the first curved flow path, which has a large flow path cross-sectional area, thereby improving the turning ability of the long sewage. Furthermore, in the flow path downstream of the downstream end of the downward bent surface in the connecting pipeline, the bottom surface forms an almost horizontal surface, so that wastewater that flows vertically downward from the vertical pipeline into the connecting pipeline flows vertically downward within the connecting pipeline before the long sewage falls, and after colliding with the almost horizontal bottom surface below, it is likely to flow back upward. This allows the subsequent wastewater to merge with the wastewater that has previously flowed back, thereby increasing the ability to start the siphon action before the long, large waste reaches the drain. In addition, when a long piece of waste turns around, it collides with the nearly horizontal bottom surface of the connecting pipe, so any paper or other materials that flow in with the waste are crushed, making it easier to discharge them into the horizontal pipe.

[0008] In the present invention, the downwardly bent surface is preferably arranged in a position shifted by the diameter of the first bent flow path relative to the upwardly bent surface in a downward direction in a flow path diameter direction of the first bent flow path in parallel therewith in a side view. In the present invention configured in this manner, the downward bent surface of the first bent flow path of the connecting pipeline is, when viewed from the side, positioned parallel to the upper bent surface and shifted by the flow path diameter downward in the flow path diameter direction of the first bent flow path, thereby improving the turning ability of long and large waste in the first bent flow path. Therefore, the performance of discharging long and large waste from the drain socket can be improved.

[0009] In the present invention, preferably, the horizontal pipeline has a second bent flow path that extends horizontally from the upstream end connected to the connecting pipeline and then bends downward toward the floor-side drain outlet, and this second bent flow path includes an upward bent surface above it, and the upward bent surface of the second bent flow path is set so that its radius of curvature is larger than the radius of curvature of the downward bent surface of the first bent flow path of the connecting pipeline when viewed from the side. In the present invention configured in this manner, the radius of curvature in a side view of the upper bent surface of the second bent flow path of the horizontal pipeline is set to be larger than the radius of curvature of the lower bent surface of the first bent flow path of the connecting pipeline, thereby making the water resistance in the horizontal pipeline smaller than the water resistance in the connecting pipeline. Therefore, siphon action is less likely to occur in the horizontal pipeline than in the connecting pipeline, so that the siphon action can be initiated earlier in the connecting pipeline while the time required for the siphon action to end can be shortened, while the siphon action is less likely to persist for long periods in the horizontal pipeline.

[0010] In the present invention, preferably, the upstream end of the downwardly bent surface is located on a vertical inner wall surface extending substantially vertically from the vertical pipeline to the connecting pipeline. In the present invention configured in this manner, the upstream end of the downward bent surface of the first bent flow path of the connecting pipeline is located on a vertical inner wall surface extending approximately vertically from the vertical pipeline to the connecting pipeline, so the size of the flow path cross-sectional area upstream of the upstream end of the downward bent surface of the first bent flow path in the connecting pipeline can be designed to be smaller than the downstream side, making it easier to create a watertight region and improving the starting ability of the siphon action. On the other hand, in the intermediate section downstream of the upstream end of the downward bent surface in the first bent flow path in the connecting pipeline, the cross-sectional area of the flow path can be designed to be locally larger, thereby improving the ability to maintain the siphon action and the turning ability of long sewage. That is, by locally increasing the flow path cross-sectional area of the first bent flow path in the connecting pipe, the turning performance of long waste can be improved while increasing the starting and maintaining power of the siphon action.

[0011] In the present invention, preferably, the upstream end of the downwardly bent surface is located above the central axis of the flow path cross section on the upstream side of the horizontal pipe. In the present invention configured in this manner, the upstream end of the downward bent surface of the first bent flow path in the connecting pipeline is located above the central axis of the flow path cross section on the upstream side of the horizontal pipeline, so when long, large pieces of sewage contained in the wastewater flowing down from the vertical pipeline into the connecting pipeline approaches the upstream end of the downward bent surface of the first bent flow path, they can begin to turn while maintaining high potential energy due to their high position above the central axis of the flow path cross section on the upstream side of the horizontal pipeline. Therefore, the long sewage that has begun to turn continues to turn in the middle section of the first curved flow path in the connecting pipeline while maintaining high potential energy, allowing it to be smoothly transported into the horizontal pipeline, thereby increasing the transport force of the sewage. Therefore, by increasing the waste transporting force, the distance over which waste is transported from the connecting pipe through the horizontal pipe to the floor-side drain outlet can be set to be greater, thereby increasing the flexibility of construction.

[0012] The present invention also provides a siphon flush toilet equipped with the above-mentioned drain socket. With this configuration, the present invention can provide a siphon-type flush toilet that can improve waste discharge performance by increasing the turning ability of long waste objects within the connecting pipe of the drain socket. [Effects of the Invention]

[0013] The drain socket of the present invention, and a siphon flush toilet equipped with it, can improve the turning ability of long, large waste objects within the drain pipe of the drain socket, preventing clogging with waste objects. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a schematic side cross-sectional view of a siphon flush toilet equipped with a drain socket according to an embodiment of the present invention. [Figure 2] 2 is a partially enlarged cross-sectional view showing a portion of the drain socket according to the embodiment of the present invention shown in FIG. 1. FIG. [Figure 3]10A and 10B are diagrams showing the state of a long waste object before and after turning around in the internal flow path of a drain socket according to one embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0015] A drain socket according to one embodiment of the present invention, and a siphon flush toilet equipped with the same, will now be described with reference to the accompanying drawings. First, FIG. 1 is a schematic side cross-sectional view of a siphon flush toilet equipped with a drain socket according to this embodiment. As shown in Figure 1, a siphon flush toilet 2 equipped with a drain socket 1 according to this embodiment comprises a ceramic toilet body 4 that is placed on the floor F, and a flush water supply device 6 installed behind it. The drain socket 1 also connects the toilet body 4 to a floor-side drain pipe D that is installed so as to extend from below the floor F upward. As a result, the flush toilet 2 of this embodiment is installed so that the bottom surface of the toilet body 4 is in contact with the floor surface F, making it a so-called "floor-mounted flush toilet," and the toilet body 4 is connected to a floor-side drain pipe D (floor-side drain pipe D) via the drain socket 1, so that wastewater discharged from the toilet body 4 is drained into the floor-side drain pipe D via the drain socket 1, making it a so-called "floor-side drainage system."

[0016] Next, as shown in Figure 1, the toilet body 4 comprises a bowl portion 8 for receiving waste, a rim portion 10 formed on the upper edge of the bowl portion 8, and a drain trap pipe 12 extending from an inlet portion 12a connected to the bottom of the bowl portion 8 to discharge waste within the bowl portion 8. As shown in FIG. 1, the drain trap pipe 12 has an ascending pipe 12c that rises from the downstream side of the inlet 12a to a rearward and upward top 12b, and a descending pipe 12d that descends rearward and downward from the top 12b of the ascending pipe 12c. Furthermore, as shown in FIG. 1, the toilet body 4 is provided with a rim spout 14 provided in the rim portion 10 and a jet spout 16 provided below and outside the bowl portion 8. Here, the rim spout 14 is directed toward the front inside the bowl portion 8, while the jet spout 16 is directed toward the inlet portion 12a of the drain trap pipe 12 at the rear thereof. As a result, the flushing water supplied from the flushing water supply device 6 to the toilet body 4 is discharged W1 (rim discharge W1) from the rim discharge port 114 into the bowl section 8, while the jet discharge port 16 is discharged W2 (jet discharge W2) to spray flushing water toward the inlet section 12a of the forward drain trap pipe line 12. As a result, the flush toilet 2 according to this embodiment is a so-called "siphon-type flush toilet" that uses the siphon action to suck up waste inside the bowl section 8 and discharge it all at once to the outside through the drain trap pipe 12. The flush toilet 2 of this embodiment employs a toilet flushing method known as "rim-jet flushing," in which the toilet is flushed with flush water (rim water W1, jet water W2) discharged from each of the rim spout 14 and jet spout 16, but this is not limited to this; it is also possible to omit the jet spout 16 and flush the toilet only with flush water (rim water W1) discharged into the bowl section 8 from only the rim spout 14, in other words, a toilet flushing method using "100% rim water discharge."

[0017] As shown in FIG. 1, the flush water supply device 6 employs a tank device that includes a water storage tank (not shown) that stores flush water supplied from a water supply source (not shown) such as a tap, and a pump (not shown) that pressure-feeds the flush water in the water storage tank (not shown) to the toilet body 4, but as the details of these are the same as those of conventional tank devices, explanations thereof will be omitted. The tank device may take the form of a so-called gravity-fed water storage tank, in which flush water stored in a water storage tank (not shown) is supplied to the toilet body 4 using gravity. Alternatively, a flush water supply device 6 other than a tank device may be a direct water pressure type or flush valve type that directly uses the water supply pressure of tap water to supply it directly to the toilet body 4.

[0018] Furthermore, the siphon-type flush toilet 2 of this embodiment may be a so-called tank-type flush toilet, in which flush water stored in a water storage tank (not shown) of the flush water supply device 6 is supplied to each of the rim spout 14 and jet spout 16 of the toilet body 4. Alternatively, the siphon flush toilet 2 of this embodiment may be a so-called hybrid flush toilet in which flush water supplied to the flush water supply device 6 under direct pressure from the water mains is supplied directly to the rim spout 14 of the toilet body 4, and flush water that is supplied to and stored in a water storage tank (not shown) of the flush water supply device 6 is supplied to the jet spout 16 of the toilet body by a pump (not shown).

[0019] Next, the drain socket 1 of this embodiment will be described in detail with reference to FIGS. FIG. 2 is a partially enlarged cross-sectional view of the drain socket according to the present embodiment shown in FIG. First, as shown in Figures 1 and 2, the drain socket 1 connects the toilet-side drain outlet 12e of the toilet body 4 of the siphon flush toilet 2 to the floor-side drain outlet D0, which is the inlet of the floor-side drain pipe D. From upstream to downstream, this drain socket 1 is equipped with a vertical pipe 18, a connecting pipe 20, and a horizontal pipe 22.

[0020] Next, as shown in Figure 2, the vertical pipe 18 is provided upstream of the internal flow path within the drain socket 1, and its upstream end (upper end 18a) is connected to the outlet portion (toilet-side drain port 12e) of the drain trap pipe 12 of the toilet body 4, forming a flow path that extends entirely in the vertical direction. As shown in FIG. 2, the connecting pipeline 20 forms a flow path that extends vertically downward from an upstream end 20a (upper end 20a) connected to the downstream end 18b (lower end 18b) of the vertical pipeline 18 and then bends toward the horizontal downstream end 20b (front end 20b). Furthermore, as shown in Figure 2, the horizontal pipeline 22 has an upstream end 22a (rear end 22a) connected to the downstream end (front end 20b) of the connecting pipeline 20, and a downstream end 22b (lower end 22b) connected to the floor-side drain outlet D0.

[0021] Here, as shown in Figure 2, the central axis A1 (drainage core A1) passing through the center O1 of the toilet side drain outlet 12e and extending vertically within the vertical pipe 18 is located a predetermined distance behind the central axis A2 (drainage core A2) passing through the center O2 of the floor side drain outlet D0 and extending vertically within the floor side drain pipe D, and the two centers O1, O2 are arranged eccentrically to each other. As shown in FIG. 2, the connecting pipeline 20, the details of which will be described later, has a flow path cross-sectional area S1 of the first bent flow path B1, which is an intermediate flow path, set larger than the flow path cross-sectional area S2 of the downstream end 18b (lower end 18b) of the vertical pipeline 18 and the flow path cross-sectional area S3 of the upstream end 22a (rear end 22a) of the horizontal pipeline 22 (S1>S2, S3).

[0022] Next, as shown in Figure 2, the connecting pipeline 20, more specifically, forms a first bent flow path B1 that extends vertically downward from the upstream end 20a (upper end 20a) connected to the vertical pipeline 18 and then bends toward the horizontal pipeline 22. The first bent flow path B1 includes an upper bent surface 24 and a lower bent surface 26 that face each other above and below in the radial direction of the flow path. Also, as shown in Figure 2, the downward bent surface 26 is arranged in a position shifted by the flow path diameter D1 (diameter D1) in parallel downward in the flow path radial direction d1 of the first bent flow path B1 relative to the upper bent surface 24 in a side view. Furthermore, the flow path cross-sectional area S1 between the upper bent surface 24 and the lower bent surface 26 is set to be larger than the flow path cross-sectional areas S2 and S3 of the vertical pipeline 18 and the horizontal pipeline 22, respectively (S1>S2, S3).

[0023] Next, as shown in FIG. 2, the downwardly bent surface 26 has an upstream end 26a located on a vertical inner wall surface 20c that extends substantially vertically from the vertical pipeline 18 to the connecting pipeline 20 in a side view. In addition, the downward bent surface 26 is formed in a generally concave curved or partially arcuate shape when viewed from the side, and its downstream end 26b is located upstream of the flow path center axis A3 (drainage core A3) extending vertically of the vertical pipe 18, which coincides with the center axis A1 of the toilet side drain outlet 12e. Furthermore, when viewed from the side, the bottom surface 26c of the flow path downstream of the downstream end 26b of the downward bent surface 26 within the connecting pipeline 20 forms an approximately horizontal surface extending rearward from the downstream end 26b of the downward bent surface 26.

[0024] Next, as shown in Figure 2, the horizontal pipeline 22 has a second curved flow path B2 that extends horizontally rearward from the upstream end (rear end 22a) connected to the connecting pipeline 20 and then bends downward toward the floor-side drain outlet D0. Also, as shown in Figure 2, the second bent flow path B2 includes an upward bent surface 28 above it, and the radius of curvature ρ1 of this upward bent surface 28 is set to be larger than the radius of curvature ρ2 of the downward bent surface 26 of the first bent flow path B1 of the connecting pipeline 20 in a side view (ρ1>ρ2). Furthermore, as shown in Figure 2, the upstream end 26a of the downward bent surface 26 of the connecting pipeline 20 is located above the central axis A4 (drainage core A4) which passes through the center O3 of the flow path cross section of the upstream end 22a of the horizontal pipeline 22 and extends in the forward / backward direction, when viewed in a plan view.

[0025] Next, the operation of the drain socket 1 according to the present embodiment described above, and the siphon flush toilet 2 equipped with it, will be explained with reference to FIGS. 3A and 3B are diagrams each showing a schematic view of a long piece of waste w before and after it turns around in the internal flow path of the drain socket 1 according to this embodiment. First, according to the drain socket 1 of this embodiment, wastewater containing long and large waste matter w discharged from the toilet-side drain outlet 12e of the siphon-type flush toilet 2 into the vertical pipe 18 of the drain socket 1 flows down the vertical pipe 18, flows into the connecting pipe 20, and then passes through the horizontal pipe 22 and is discharged from the floor-side drain outlet D0 into the floor-side drain pipe D. In particular, as shown in (A) of Figure 3, when long and large sewage w that flows vertically downward from the vertical pipeline 18 into the connecting pipeline 20 together with wastewater moves vertically downward within the connecting pipeline 20 and then passes through the intermediate flow path (first bent flow path B1) of the connecting pipeline 20, the flow path cross-sectional area S1 of the intermediate flow path B1 of the connecting pipeline 20 is set larger than the flow path cross-sectional area S2 of the downstream end 18b (lower end 18b) of the vertical pipeline 18 and the flow path cross-sectional area S3 of the upstream end 22a (rear end 22a) of the horizontal pipeline 22. As a result, the long waste w in the connecting pipeline 20 can easily turn toward the horizontal pipeline 22 together with the wastewater flow f1 along the flow path that extends vertically downward in the connecting pipeline 20 and then bends toward the horizontal pipeline 22 (see (B) of Figure 3). The long waste w, which has been turned around in the connecting pipeline 20 so as to be directed toward the horizontal pipeline 22, passes through the horizontal pipeline 22 and is then discharged from the floor-side drain outlet D0. As a result, the flow path cross-sectional area S1 of the intermediate flow path (first curved flow path B1) of the connecting pipeline 20 was set larger than the flow path cross-sectional area S2 of the downstream end 18b (lower end 18b) of the vertical pipeline 18 and the flow path cross-sectional area S3 of the upstream end 22a (rear end 22a) of the horizontal pipeline 22, thereby improving the turning ability of the long sewage w within the connecting pipeline 20 and improving the sewage discharge performance.

[0026] Next, according to the drain socket 1 of this embodiment, as shown in Figure 2, the downstream end 26b of the downward bent surface 26 in the first bent flow path B1 in the connecting pipeline 20 is located upstream of the flow path center axis A3 of the vertical pipeline 18 in a side view. This allows the flow path cross-sectional area S1 of the first bent flow path B1 to be larger than the flow path cross-sectional areas S2, S3 of the vertical pipeline 18 and the horizontal pipeline 22, respectively. Therefore, as shown in (A) and (B) of Figures 3, the long sewage w that flows vertically downward from the vertical pipeline 18 into the connecting pipeline 20 together with the wastewater can be sufficiently turned toward the horizontal pipeline 22 within the first curved flow path B1, which has a large flow path cross-sectional area S1, thereby improving the turning ability of the long sewage w. In the flow path downstream of the downstream end 26b of the downward bent surface 26 within the connecting pipeline 20, the bottom surface 26c forms a substantially horizontal surface extending rearward from the downstream end 26b of the downward bent surface 26. As a result, as shown in (A) of Figure 3, the wastewater f0 that flows vertically downward from the vertical pipe 18 into the connecting pipe 20 flows vertically downward within the connecting pipe 20 before the long and large waste w falls, and after colliding with the approximately horizontal bottom surface 26c below, it is likely to flow back upward. Therefore, by the subsequent wastewater joining the wastewater f0 that has previously flowed back, the siphon action can be started more easily before the long and large waste w arrives. Furthermore, as shown in Figure 3 (B), the long waste w that has turned around collides with the nearly horizontal bottom surface 26c in the connecting pipeline 20, so that paper and other materials that flow in together with the waste w are crushed, making it easier to discharge them into the horizontal pipeline 22.

[0027] Furthermore, according to the drain socket 1 of this embodiment, as shown in Figure 2, the downward bent surface 26 of the first bent flow path B1 of the connecting pipeline 20 is positioned, in a side view, parallel to the upper bent surface 24 and shifted downward in the flow path radial direction d1 of the first bent flow path B1 by the flow path diameter D1 (diameter D1). This allows the turning ability of the long filth w in the first curved flow path B1 to be improved, and therefore the discharge performance of the long filth w in the drain socket 1 can be improved.

[0028] Furthermore, according to the drain socket 1 of this embodiment, as shown in Figure 2, the radius of curvature ρ1 in a side view at the upper bent surface 28 of the second bent flow path B2 of the horizontal pipeline 22 is set to be larger than the radius of curvature ρ2 of the lower bent surface 26 of the first bent flow path B1 of the connecting pipeline 20 (ρ1>ρ2). This allows the water resistance in the horizontal pipeline 22 to be smaller than the water resistance in the connecting pipeline 20. Therefore, it is possible to make it more difficult for siphoning to occur in the horizontal pipeline 22 than in the connecting pipeline 20, so that it is possible to speed up the initiation of siphoning in the connecting pipeline 20 and shorten the time it takes for the siphoning to end, while it is possible to make it more difficult for the siphoning to continue for a long period of time in the horizontal pipeline 22.

[0029] Furthermore, according to the drain socket 1 of this embodiment, as shown in Figure 2, the upstream end 26a of the downward bent surface 26 in the first bent flow path B1 of the connecting pipeline 20 is located on the vertical inner wall surface 20c extending approximately vertically from the vertical pipeline 18 to the connecting pipeline 20. This allows the size of the flow path cross-sectional area upstream of the upstream end 26a of the downward bent surface 26 of the first bent flow path B1 in the connecting pipeline 20 to be designed to be smaller than the downstream side, making it easier to create a watertight area and improving the starting ability of the siphon action. On the other hand, in the intermediate section downstream of the upstream end 26a of the downward bent surface 26 in the first bent flow path B1 in the connecting pipeline 20, the size of the flow path cross-sectional area S1 can be designed to be locally larger, thereby improving the maintenance power of the siphon action and the turning ability of long and large sewage w. That is, by locally increasing the flow path cross-sectional area S1 of the first bent flow path B1 in the connecting pipeline 20, the turning performance of the long waste w can be improved while increasing the starting and maintaining power of the siphon action.

[0030] Furthermore, according to the drain socket 1 of this embodiment, as shown in Figure 2, the upstream end 26a of the downward bent surface 26 in the first bent flow path B1 in the connecting pipeline 20 is located above the central axis A4 (drain core A4) of the flow path cross section on the upstream side of the horizontal pipeline 22. As a result, as shown in (A) of Figure 3, when the long and large waste matter w contained in the wastewater flowing down from the vertical pipeline 18 into the connecting pipeline 20 approaches the upstream end 26a of the downward bent surface 26 in the first bent flow path B1, it can begin to turn while maintaining high potential energy due to its high position above the central axis A4 (drainage core A4) of the flow path cross section on the upstream side of the horizontal pipeline 22. Therefore, as shown in (B) of Figure 3, the long sewage w that has begun to turn continues to turn in the middle section of the first curved flow path B1 in the connecting pipeline 20 while maintaining high potential energy, and is smoothly transported into the horizontal pipeline 22, thereby increasing the transport force of the sewage. Therefore, by increasing the waste transporting force, the distance over which the waste w is transported from the connecting pipe 20 through the horizontal pipe 22 to the floor-side drain outlet D0 can be set to be greater, thereby increasing the degree of freedom in construction.

[0031] Furthermore, with a siphon flush toilet 2 equipped with a drain socket 1 according to this embodiment, it is possible to provide a siphon flush toilet 2 that can improve waste discharge performance by increasing the turning ability of long waste objects w within the connecting pipe 20 of the drain socket 1. [Explanation of symbols]

[0032] 1. Drainage socket according to one embodiment of the present invention 2. Siphon-type flush toilet 4 Toilet body 6 Cleaning water supply device 8 Toilet bowl 10 Rim of toilet bowl body 10a Inner surface of rim portion (circumferential surface of rim portion) 10b Rim top 10c Rear edge of rim top 10d Back side and top of the rim 12 Toilet body drain trap pipe 12a Inlet of drain trap pipe 12b Top of drain trap line 12c Drain trap pipe riser 12d Downstream pipe of drain trap pipe 12e Outlet of drain trap pipe, outlet of downflow pipe, toilet side drain 14 Rim Spout 16 Jet Spout 18 Vertical pipe of drain socket 18a Upstream end (top end) of vertical pipe of drain socket 18b Downstream end (bottom end) of vertical pipe of drain socket 20 Drainage socket connecting pipe, first bent flow path 20a Upstream end (top end) of the drain socket connection pipe 20b Downstream end (front end) of the drain socket connection pipe 20c Vertical inner wall of the drain socket connection pipe 22 Horizontal pipe for drain socket 22a Upstream end (rear end) of horizontal drainage socket pipe 22b Downstream end (bottom end) of horizontal pipe of drain socket 24 Upper bent surface of the connecting pipe of the drain socket 26 Downward bent surface of connecting pipe of drain socket 26a Upstream end of the downward bent surface of the connecting pipe of the drain socket 26b Downstream end of the downward bent surface of the connecting pipe of the drain socket 26c The bottom surface of the flow path downstream of the downstream end of the downward bent surface of the connecting pipe of the drain socket 28 Upper bent surface of horizontal drainage socket pipe A1 Central axis of the toilet drain, drain core A2 Center axis of the inlet of the floor-side drain pipe, drain core A3 Vertical pipe flow axis, drainage core A4 The central axis that passes through the center of the flow path cross section at the upstream end of the horizontal pipe and extends in the front-to-back direction, the drainage center B1 1st bent pipe B2 2nd bent pipe D Floor side drain pipe D0 Floor drain pipe inlet, floor drain outlet D1 Diameter of the first bend d1 Flow path radial direction F Floor f0 Wastewater that flows vertically downward from the vertical pipe into the connecting pipe f1 Wastewater flow O1 Center of toilet drain O2 Center of floor drain pipe inlet O3 Center of the flow cross section at the upstream end of the horizontal pipe S1: Cross-sectional area of the intermediate flow path (first bent flow path) of the connecting pipe S2: Cross-sectional area of the upstream end of the connecting pipe S3 Flow cross-sectional area of the downstream end of the connecting pipe W1 Rim Spout W2 Jet Water Spout w Long and filthy ρ1 Radius of curvature in side view of the upper bent surface of the second bent flow path of the horizontal pipe ρ2 Radius of curvature of the downward bend of the first bend in the connecting pipe

Claims

1. A drain socket that connects the toilet-side drain outlet and the floor-side drain outlet of a siphon-type flush toilet, a vertical pipe connected to the toilet-side drain outlet and forming a flow path extending in a vertical direction; a connecting pipe that forms a flow path that extends vertically downward from an upstream end connected to the vertical pipe and then bends toward a horizontal downstream end; a horizontal pipe including an upstream end connected to the connecting pipe and a downstream end connected to the floor-side drain outlet, the centers of which are eccentric to the toilet-side drain outlet; A drain socket characterized in that the cross-sectional area of the flow path of the connecting pipeline is set larger than the cross-sectional areas of the flow paths of the vertical pipeline and the horizontal pipeline.

2. an intermediate flow path of the connecting pipeline forms a first bent flow path including an upper bent surface and a lower bent surface facing each other above and below in a radial direction of the flow path so that a flow path cross-sectional area of the intermediate flow path is larger than the flow path cross-sectional areas of the vertical pipeline and the horizontal pipeline, A drain socket as described in claim 1, wherein the downstream end of the downwardly bent surface is located upstream of the flow path center axis of the vertical pipeline when viewed from the side, and the bottom surface of the flow path downstream of the downstream end of the downwardly bent surface in the connecting pipeline forms an approximately horizontal surface.

3. The drain socket according to claim 2, wherein the downward bent surface is arranged, in a side view, at a position offset by the diameter of the first bent flow path in a direction parallel to and downward in the flow path diameter direction of the first bent flow path relative to the upward bent surface.

4. The horizontal pipe has a second bent flow path that extends horizontally from an upstream end connected to the connecting pipe and then bends downward toward the floor-side drain outlet, and the second bent flow path includes an upward bent surface at its upper portion, A drain socket as described in claim 2, wherein the upper curved surface of the second curved flow path has a radius of curvature larger than the radius of curvature of the lower curved surface of the first curved flow path of the connecting pipeline when viewed from the side.

5. 3. The drain socket according to claim 2, wherein the upstream end of said downwardly bent surface is located on a vertical inner wall surface extending substantially vertically from said vertical conduit to said connecting conduit.

6. 3. The drain socket according to claim 2, wherein the upstream end of the downwardly bent surface is located above the central axis of the upstream flow passage cross section of the horizontal pipe.

7. A siphon flush toilet equipped with the drain socket according to any one of claims 1 to 6.

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