Siphon type water closet for wall drain

Abstract

To provide a siphon type water closet for wall drain that can secure a drop in water level before and after occurrence of siphonage in a flow path within a drain socket and can sufficiently generate siphonage.SOLUTION: A siphon type water closet 1 for wall drain of the present invention comprises a toilet bowl body 2 and a drain socket 6, wherein: the drain socket comprises a toilet bowl side connection part 18 connected to an outlet part 12e of a drain trap pipeline 12, a bent flow path 20 that extends from the toilet bowl side connection part to a lowermost end section 20a and then bends toward an inlet part D0 of a wall side drain pipe D, and a wall drain pipe side connection part 22 that is provided on a downstream side of the bent flow path and is connected to the inlet part of the wall side drain pipe; the bent flow path includes a lower flow path 28 formed below centers O1, O2 of cross sections C1, C2 of the wall drain pipe side connection part or the wall side drain pipe; and a flow path cross-sectional area S1 of the lower flow path is set to be smaller than cross-sectional areas S2, S3 of the wall drain pipe side connection part or the wall side drain pipe.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to flush toilets, and more particularly to a wall-drainage siphon-type flush toilet that discharges waste into a wall-side drain pipe by siphon action. [Background technology]

[0002] BACKGROUND ART Conventionally, siphon-type flush toilets for wall drainage that discharge waste into a wall-side drain pipe by siphon action are known, such as those described in Patent Documents 1 and 2. First, in the conventional wall-drainage siphon-type flush toilet described in Patent Document 1, the height of the centre of the downstream end of the wall-drainage drain socket (drain core) is the same as the height of the centre of the wall-side drain pipe connected downstream of it. Furthermore, in the conventional wall-drainage siphon-type flush toilet described in Patent Document 2, the height of the centre of the downstream end of the wall-drainage drain socket (drain core) is set lower than the height of the centre of the wall-side drain pipe, but the lowest end of the flow path within the drain socket is structured to be positioned higher than the lowest end of the downstream drain pipe. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-197004 [Patent Document 2] Japanese Patent Application Laid-Open No. 2009-52272 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the trend toward water conservation in wall-drainage siphon-type flush toilets, the challenge has been to increase the efficiency of the siphon action in the drain trap pipe and the drain socket downstream, by minimizing the amount of water wasted up until the siphon action occurs while ensuring that it occurs early. In particular, in the drain socket of a siphon-type flush toilet for wall drainage, an important issue in order to improve siphon activation is how to ensure water accumulation by creating a difference in height between the lowest end of the flow path in the drain socket and the drain core of the connection part that connects to the wall-side drain pipe.

[0005] Therefore, the present invention was made to solve the problems of the prior art mentioned above, and aims to provide a wall-drainage siphon-type flush toilet that can ensure a difference in water level before and after the siphon action occurs in the flow path inside the drain socket, and that can fully generate the siphon action. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems, the present invention provides a siphon-type flush toilet for wall drainage that discharges waste into a wall-side drain pipe by siphon action, the toilet body having a bowl portion that receives waste, and a drain trap pipe line whose inlet portion is connected below the bowl portion, and a drain socket that connects the outlet portion of the drain trap pipe line to the inlet portion of the wall-side drain pipe that extends horizontally from the wall side, the drain socket having a toilet-side connector portion that is connected to the outlet portion of the drain trap pipe line, and a lowermost connector portion that is connected to the toilet-side connector portion. The system comprises a curved flow path that forms a flow path extending downward to the end and then curves at its downstream side toward the inlet of the wall-side drain pipe, and a wall-side drain pipe side connection portion that is provided downstream of the curved flow path and connected to the inlet of the wall-side drain pipe, and the curved flow path includes a downward flow path formed below the center of the cross-section of the wall-side drain pipe side connection portion or the wall-side drain pipe, and the flow path cross-sectional area of the downward flow path is set to be smaller than the cross-sectional area of the wall-side drain pipe side connection portion or the wall-side drain pipe. In the present invention configured in this manner, the curved flow path of the drain socket includes a lower flow path arranged below the center of the cross-section of the wall drain pipe side connection portion or the wall side drain pipe, and the flow path cross-sectional area of this lower flow path is set to be smaller than the cross-sectional area of the wall drain pipe side connection portion or the wall side drain pipe, so that a water collection area can be secured in the lower flow path of the curved flow path of the drain socket. Therefore, even if the lower flow path of the curved flow path of the drain socket is positioned below the wall drain pipe side connection part of the drain socket or the center of the cross section of the wall side drain pipe, it is possible to ensure a drop in water level before and after the siphon action occurs in the flow path within the drain socket, and the siphon action can be generated sufficiently.

[0007] In the present invention, the bottom surface of the curved flow path is preferably connected to rise from the lowest end of the curved flow path to the lowest end surface within the flow path of the wall drain pipe side connecting portion. In the present invention configured in this manner, the bottom surface of the curved flow path of the drain socket is connected upward from the lowest end of the curved flow path to the lowest end surface within the flow path of the wall drain pipe side connection part, so that the height position of the bottom surface of the curved flow path of the drain socket can be set as low as possible. Therefore, a difference in water level before and after the siphon action occurs can be secured in the flow path inside the drain socket, allowing the siphon action to occur sufficiently.

[0008] In the present invention, preferably, the curved flow path has an annular expansion flow path formed in a ring shape with a predetermined thickness between its lowest end and the wall drain pipe side connection part, and the lateral region of this annular expansion flow path is formed so as to expand from the upstream side to the downstream side. In the present invention configured in this manner, the lateral region of the annular expanded flow path between the lowest end of the curved flow path and the wall drain pipe side connection portion is formed so as to expand from the upstream side to the downstream side.Therefore, when connecting the curved flow path of the drain socket and the flow path of the wall side drain pipe, which have different flow path cross-sectional areas, a smooth connection can be made by interposing an annular expanded flow path whose lateral region expands from the upstream side to the downstream side. Therefore, when waste is discharged from the drain socket into the wall-side drain pipe, clogging of the waste can be suppressed, thereby improving waste discharge performance.

[0009] In the present invention, preferably, the wall drain pipe side connection portion comprises an outer annular portion to which the wall side drain pipe is connected, and an inner annular portion located inside the outer annular portion and connected to the downstream end of the annular expanded flow path, and the first central axis of the flow path cross section of the inner annular portion is set at a position lower than the second central axis of the cross section of the outer annular portion and set at a position higher than the third central axis of the flow path cross section including the lowest end of the curved flow path, and the lower end within the annular expanded flow path is set at a position lower than the third central axis and set at a position higher than the lowest end of the curved flow path. In the present invention configured in this manner, the first central axis of the flow path cross section of the inner annular portion of the wall drain pipe side connection portion is set at a position lower than the second central axis of the cross section of the outer annular portion, and is set at a position higher than the third central axis of the flow path cross section including the lowest end of the curved flow path of the drain socket, thereby suppressing the amount of eccentricity of the third central axis of the flow path cross section including the lowest end of the curved flow path of the drain socket relative to the first central axis of the flow path cross section of the inner annular portion of the wall drain pipe side connection portion. This allows for wastewater discharge from the outlet of the drain trap pipe in the toilet body to be drained through the curved flow path of the drain socket into the wall-side drain pipe, a process known as "wall drainage," to be carried out while appropriately suppressing the load that causes the wastewater to rise along the curved flow path to the wall-side drain pipe, while ensuring waste discharge performance. In addition, since the lower end of the annular expansion passage is set at a position lower than the third central axis of the curved passage and higher than the lowest end of the curved passage, an adequate water pooling area can be secured in the lower passage of the curved passage of the drain socket.

[0010] In the present invention, preferably, the lower flow path of the curved flow path includes the lowest end portion to form a water pooling area, and at least a portion of this water pooling area is positioned vertically below the inlet portion of the curved flow path connected to the toilet side connection portion when viewed from above or from the side of the drain socket. In the present invention configured in this manner, the lower flow path of the curved flow path includes the lowest end, thereby forming a water pooling area, and at least a portion of this water pooling area is positioned vertically below the inlet of the curved flow path connected to the toilet side connection part when viewed from above or from the side of the drain socket.Therefore, when the wastewater discharged from the outlet of the drain trap pipe of the toilet body into the drain socket flows down from the inlet of the curved flow path of the drain socket to the lowest end, it joins the water pooling area of the lower flow path and can quickly generate a siphon action.

[0011] In the present invention, the lowermost end of the curved flow path is preferably located downstream of a wall surface formed on the inner circumferential side and below the inlet of the curved flow path. In the present invention configured in this manner, the lowest end of the curved flow path is located downstream of the wall surface formed inward and below the inlet of the curved flow path, so even if the wastewater discharged from the outlet of the drain trap pipe of the toilet body into the drain socket flows down along the wall surface from the inlet of the curved flow path of the drain socket, the Coanda effect, etc., prevents the wastewater from falling directly onto the lowest end of the curved flow path, thereby avoiding the reduction of the puddle effect by the water falling into the center of the puddle area. Therefore, a siphon action can be efficiently generated within the drain socket, and wall drainage from the drain socket to the wall-side drain pipe can be reliably performed. [Effects of the Invention]

[0012] According to the wall-drainage siphon flush toilet of the present invention, it is possible to ensure a difference in water level before and after the siphon action occurs in the flow path inside the drain socket, allowing the siphon action to occur sufficiently. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic cross-sectional side view of a wall-drainage siphon flush toilet according to one embodiment of the present invention. FIG. [Figure 2]FIG. 2 is a rear view of the drain socket in the wall-drainage siphon flush toilet according to the embodiment of the present invention shown in FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. DETAILED DESCRIPTION OF THE INVENTION

[0014] A wall-drainage siphon flush toilet according to one embodiment of the present invention will now be described with reference to the accompanying drawings. First, FIG. 1 is a schematic cross-sectional side view of a wall-drainage siphon flush toilet according to this embodiment. As shown in Figure 1, the wall-drainage siphon-type flush toilet 1 of this embodiment comprises a ceramic toilet body 2 that is installed on the floor F, a flush water supply device 4 installed behind it, and a drain socket 6 that connects the toilet body 2 to a floor-side drain pipe D that extends from below the floor F to above it. As a result, the wall-drainage siphon flush toilet 1 of this embodiment is installed so that the bottom surface of the toilet body 2 comes into contact with the floor surface F, making it a so-called "floor-mounted flush toilet." Furthermore, the wall-drainage siphon-type flush toilet 1 of this embodiment has its toilet body 2 connected via a drain socket 6 to a drain pipe D (wall-side drain pipe D) on the back side of the wall W of the toilet room T, and the wastewater discharged from the toilet body 2 is drained into the wall-side drain pipe D via the drain socket 6, in what is known as a "floor-side drainage system."

[0015] Next, as shown in Figure 1, the toilet body 2 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 2 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 4 to the toilet body 2 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 1 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 to the outside through the drain trap pipe 12 all at once. The flush toilet 1 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."

[0016] As shown in FIG. 1, the flush water supply device 4 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 2, 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 2 using gravity. Alternatively, a flush water supply device 4 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 2.

[0017] Furthermore, the wall-draining siphon-type flush toilet 1 of this embodiment may also 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 4 is supplied to each of the rim spout 14 and jet spout 16 of the toilet body 2. Alternatively, the wall-draining siphon-type flush toilet 1 of this embodiment may be a so-called hybrid flush toilet in which flush water supplied to the flush water supply device 4 under direct pressure from the water mains is supplied directly to the rim spout 14 of the toilet body 2, and flush water that is supplied to and stored in a water storage tank (not shown) of the flush water supply device 4 is supplied to the jet spout 16 of the toilet body by a pump (not shown).

[0018] Next, the drain socket 6 of the wall-drainage siphon flush toilet 1 of this embodiment will be described in detail with reference to Figures 1 to 4. Figure 2 is a rear view of the drain socket in the wall-drainage siphon type flush toilet according to the embodiment of the present invention shown in Figure 1. Figures 3 and 4 are cross-sectional views taken along lines III-III and IV-IV in Figure 2, respectively. First, as shown in FIGS. 1 to 4, the drain socket 6 comprises, from the upstream side to the downstream side, a toilet-side connection part 18, a curved flow path 20, and a wall drain pipe-side connection part 22. The toilet-side connection part 18 of the drain socket 6 is provided at the upper end of the drain socket 6 and serves as the entrance part of the internal flow path of the drain socket 6. In addition, an annular elastic seal connection member 24 made of a rubber material or the like is provided on the opening edge of the toilet side connection part 18. The outlet part 12e of the drain trap pipe line 12 is inserted into the inner periphery of the elastic seal connection member 24 of the toilet side connection part 18, so that the outlet part 12e of the drain trap pipe line 12 is watertightly connected to the toilet side connection part 18 of the drain socket 6.

[0019] Next, as shown in Figures 1 to 4, the curved flow path 20 of the drain socket 6 forms a flow path that extends downward from the downstream side of the toilet side connection portion 18 to the lowest end portion 20a, and then the downstream side forms a flow path that bends backward (towards the wall surface W) toward the inlet portion D0 of the wall side drain pipe D. The wall drain pipe side connecting portion 22 is provided with an annular elastic seal connecting member 26 made of a rubber material or the like on its outer periphery. The outer periphery of the wall drain pipe side connection portion 22 is inserted into the inner periphery of the inlet portion D0 of the wall side drain pipe D, so that the inlet portion D0 of the wall side drain pipe D is watertightly connected to the wall drain pipe side connection portion 22 of the drain socket 6. Furthermore, the curved flow path 20 includes a downward flow path 28 formed below the vertical centers O1, O2 of the cross sections C1, C2 of the wall drain pipe side connection portion 22 and the wall side drain pipe D, respectively, or below the central axis A1 (drainage core A1) of the wall drain pipe side connection portion 22 and the wall side drain pipe D, which passes through these centers O1, O2 and extends in the horizontal front-to-back direction. Here, the cross-sectional area S1 of the flow path cross section C3 of the downward flow path 28 (flow path cross-sectional area S1) is set to be smaller than the cross-sectional areas S2, S3 (cross-sectional areas S2, S3) of the cross sections C1, C2 of the wall drain pipe side connection portion 22 and the wall side drain pipe D, respectively (S1 <S2、S1<S3)。

[0020] Next, as shown in Figure 3, the bottom surface 20b of the curved flow path 20 of the drain socket 6 extends in a concave curve rearward and diagonally upward from the lowest end 20a of the curved flow path 20 when viewed from the side, and rises and connects to the lowest end surface 22a within the flow path of the wall drain pipe side connection portion 22. 3 and 4, the curved flow path 20 includes an annular expanded flow path 30 formed in a ring shape with a predetermined thickness t1 between the bottom end 20a and the wall drain pipe side connecting portion 22. A side region R1 of the annular expanded flow path 30 is formed so as to expand in the left-right direction from the upstream side (front side) to the downstream side (rear side).

[0021] Next, as shown in Figures 2 and 3, the wall drain pipe side connection portion 22 comprises an outer annular portion 32 to which the wall side drain pipe D is connected from the outer periphery, and an inner annular portion 34 which is located inside the outer annular portion 32 and is connected to the downstream end 30a of the annular expansion flow path 30. As shown in FIG. 3, the central axis A2 of the flow path cross section C4 of the inner annular portion 34 is set at a position lower than the central axis A1 of the cross section C1 of the outer annular portion 32, and is set at a position higher than the central axis A3 of the flow path cross section C3 including the lowest end 20a of the curved flow path 20. Furthermore, the lower end and bottom surface 30b of the annular expanded flow path 30 are set at a position lower than the central axis A3 of the flow path cross section C3 including the lowest end 20a of the curved flow path 20, and are set at a position higher than the lowest end 20a of the curved flow path 20.

[0022] 3, the lower flow path 28 of the curved flow path 20 includes the lowest end 20a, thereby forming a water pooling area W0. At least a part of this water pooling area W0 is located vertically below the inlet 20c of the curved flow path 20 connected to the toilet-side connector 18 (more precisely, the vertical wall surface 20e formed at the rear end 20d of the inlet 20c) when viewed from above or from the side of the drain socket 6. As shown in FIG. 3, the bottom end 20a of the curved flow path 20 is located downstream (rearward) of a wall surface 20e formed on the inner circumferential side and downward from the inlet 20c of the curved flow path 20.

[0023] Next, the operation of the wall-drain siphon flush toilet 1 according to the present embodiment described above will be explained with reference to FIGS. First, with the wall-drainage siphon type flush toilet 1 according to this embodiment, the curved flow path 20 of the drain socket 6 includes a downward flow path 28 that is positioned below the centers O1, O2 of the cross sections C1, C2 of the wall-drain pipe-side connecting portion 22 and the wall-side drain pipe D. The flow path cross-sectional area S1 of this downward flow path 28 is also set to be smaller than the cross-sectional areas S2, S3 of the wall-drain pipe-side connecting portion 22 and the wall-side drain pipe D, respectively (S1 <S2、S1<S3)。 As a result, a water pooling area W0 can be secured in the lower flow path 28 of the curved flow path 20 of the drain socket 6. Therefore, even if the lower flow path 28 of the curved flow path 20 of the drain socket 6 is formed and positioned lower than the centers O1, O2 of the respective cross-sections C1, C2 of the wall drain pipe side connection portion 22 of the drain socket 6 and the wall side drain pipe D, or lower than the central axis A1 (drain core A1) of the wall drain pipe side connection portion 22 and the wall side drain pipe D, it is possible to ensure a difference in water level before and after the siphon action occurs in the flow paths 20, 28, 30 within the drain socket 6, and the siphon action can be generated sufficiently.

[0024] Next, with the wall-drainage siphon type flush toilet 1 of this embodiment, the bottom surface 20b of the curved flow path 20 of the drain socket 6 is connected upward from the lowest end 20a of the curved flow path 20 to the lowest end surface 22a within the flow path of the wall drain pipe side connection part 22, so the height position of the bottom surface 20b of the curved flow path 20 of the drain socket 6 can be set as low as possible. Therefore, the difference in water level before and after the siphon action can be ensured in the flow paths 20, 28, 30 in the drain socket 6, and the siphon action can be sufficiently generated.

[0025] Furthermore, with the wall-drainage siphon flush toilet 1 of this embodiment, the lateral region R1 of the annular expanded flow path 30 between the lowest end 20a of the curved flow path 20 and the wall drain pipe side connection part 22 is formed so as to expand from the upstream side to the downstream side. This allows a smooth connection between the curved flow path 20 of the drain socket 6 and the flow path in the wall-side drain pipe D, which have different flow path cross-sectional areas, by interposing an annular expanding flow path 30 whose lateral region R1 expands from the upstream side to the downstream side. Therefore, when waste is discharged from the drain socket 6 into the wall-side drain pipe D, clogging of the waste can be suppressed, thereby improving the waste discharge performance.

[0026] Furthermore, with the wall-drainage siphon type flush toilet 1 of this embodiment, the central axis A2 of the flow path cross section C4 of the inner annular portion 34 of the wall drain pipe side connection portion 22 is set at a position lower than the central axis A1 of the transverse section C1 of the outer annular portion 32, and is set at a position higher than the central axis A3 of the flow path cross section C3 that includes the lowermost end 20a of the curved flow path 20 of the drain socket 6. This reduces the amount of eccentricity of the central axis A3 of the flow path cross section C3, which includes the lowest end 20a of the curved flow path 20 of the drain socket 6, relative to the central axis A2 of the flow path cross section C4 of the inner annular portion 34 of the wall drain pipe side connection portion 22. This allows for the discharge of wastewater f1 from the outlet 12e of the drain trap pipe 12 of the toilet body 2 into the wall-side drain pipe D through the curved flow path 20 of the drain socket 6, in what is known as "wall drainage," to be performed while appropriately suppressing the load that causes the wastewater f1 to rise along the curved flow path 20 to the wall-side drain pipe D, while ensuring waste discharge performance. In addition, since the lower end and bottom surface 30b of the annular expanded flow path 30 are set at a position lower than the central axis A3 of the curved flow path 20 and higher than the lowest end 20a of the curved flow path 20, an appropriate water pooling area W0 can be secured in the lower flow path 28 of the curved flow path 20 of the drain socket 6.

[0027] Furthermore, with the wall-drainage siphon-type flush toilet 1 of this embodiment, the lower flow path 28 of the curved flow path 20 includes the lowest end 20a, thereby forming a water pooling area W0, and at least a portion of this water pooling area W0 is positioned vertically below the inlet 20c of the curved flow path 20 that connects to the toilet-side connection part 18, when viewed from above or from the side of the drain socket 6. As a result, when the wastewater f1 discharged from the outlet 12e of the drain trap pipe 12 of the toilet body 2 into the drain socket 6 flows down from the inlet 20c of the curved flow path 20 of the drain socket 6 to the lowest end 20a, it joins the water pool area W0 of the lower flow path 28 and can quickly generate a siphon action.

[0028] Furthermore, with the siphon flush toilet 1 of this embodiment, the lowest end 20a of the curved flow path 20 is located downstream of the wall surface 20e formed on the inner periphery and below the inlet 20c of the curved flow path 20. As a result, even if the wastewater f1 discharged from the outlet 12e of the drain trap pipe 12 of the toilet body 2 into the drain socket 6 flows down along the wall surface 20e from the inlet 20c of the curved flow path 20 of the drain socket 6, the Coanda effect, etc., can prevent the wastewater f1 from falling directly onto the lowest end 20a of the curved flow path 20. Therefore, it is possible to avoid the reduction of the pooling effect caused by the drainage water falling into the center of the pooling area W0, and a siphon action can be efficiently generated within the drainage socket 6, ensuring reliable wall drainage from the drainage socket 6 to the wall-side drainage pipe D.

[0029] The wall-draining siphon-type flush toilet 1 according to this embodiment described above is described as being in the form of a so-called "floor-standing flush toilet," but it is not limited to this form and can also be applied to a so-called "wall-hung flush toilet" form in which the bottom surface of the toilet body 2 is positioned so that it is spaced above the floor surface F, and the rear end of the toilet body 2 is fixed to the wall surface W behind it. [Explanation of symbols]

[0030] 1. A wall-drainage siphon-type flush toilet according to one embodiment of the present invention 2 Toilet body 4. Cleaning water supply device 6 drain socket 8 Toilet bowl 10 Rim of toilet bowl body 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 14 Rim Spout 16 Jet Spout 18 Toilet side connection 20 Bent flow path 20a Bottom end of the curved channel 20b Bottom surface of the curved channel 20c Inlet of curved channel 20d Rear end of the inlet of the curved flow path 20e Wall surface and vertical wall surface formed on the inner circumferential side and downward from the inlet of the curved flow path 22 Wall drain pipe side connection 22a The lowest end surface of the wall drain pipe connection part in the flow path 24 Elastic seal connecting member 26 Elastic seal connecting member 28 Downstream flow path 30 Annular expansion channel 30a Downstream end of the annular expansion channel 30b Lower end and bottom surface of the annular expansion channel 32 Outer annular portion of wall drain pipe side connection 34 Inner annular portion of wall drain pipe side connection A1 The central axis of the wall-side drain pipe, the drain core, and the central axis of the cross section of the outer annular part of the wall-side drain pipe connection part (second central axis) A2 Central axis of the flow passage cross section of the inner annular part of the wall drain pipe side connection part (first central axis) A3: The central axis of the flow passage cross section including the lowest end of the curved flow passage (third central axis) C1 Cross section of outer annulus of wall drain pipe connection C2 Cross section of wall-side drain pipe C3 Flow cross section of the lower flow channel C4 Flow path cross section of the inner annulus of the wall drain pipe connection D Wall drain pipe D0 Wall drain pipe inlet F Floor f1 drainage O1 Vertical center of cross section of wall drain pipe side connection of drain socket O2 Vertical centre of cross section of wall drain pipe of drain socket O3 Center of curvature of the connection area R1 Lateral region of the annular expansion channel S1 Cross-sectional area of the lower flow channel S2 Cross-sectional area of wall drain pipe connection S3 Cross-sectional area of wall-side drainage pipe T Toilet Room t1 thickness W Toilet room wall W0 Water area W1 Rim Spout W2 Jet Water Spout

Claims

1. A siphon-type flush toilet for wall drainage that discharges waste into a wall-side drain pipe by siphon action, a toilet body including a bowl portion for receiving waste and a drain trap pipe line having an inlet portion connected below the bowl portion; a drain socket that connects the outlet of the drain trap pipe line to the inlet of the wall-side drain pipe that extends horizontally from the wall side; The drain socket comprises a toilet-side connection part connected to the outlet of the drain trap pipe line, a bent flow path that forms a flow path extending downward from the toilet-side connection part to the lowest end and then bends on its downstream side toward the inlet of the wall-side drain pipe, and a wall-side drain pipe connection part provided downstream of the bent flow path and connected to the inlet of the wall-side drain pipe, A siphon-type flush toilet for wall drainage, characterized in that the curved flow path includes a downward flow path formed below the center of the cross section of the wall drain pipe side connection portion or the wall side drain pipe, and the flow path cross-sectional area of this downward flow path is set to be smaller than the cross-sectional area of the wall drain pipe side connection portion or the wall side drain pipe.

2. 2. A wall-drainage siphon-type flush toilet according to claim 1, wherein the bottom surface of the curved flow path is connected upward from the lowest end of the curved flow path to the lowest end surface within the flow path of the wall drain pipe side connecting portion.

3. The wall-drainage siphon-type flush toilet according to claim 1, wherein the curved flow path is provided with an annular expansion flow path formed in a ring shape with a predetermined thickness between its lowest end and the wall drain pipe side connection portion, and the side areas of this annular expansion flow path are formed so as to expand from the upstream side to the downstream side.

4. The wall drain pipe side connection portion includes an outer annular portion to which the wall side drain pipe is connected, and an inner annular portion provided inside the outer annular portion and connected to the downstream end of the annular expanded flow path, a first central axis of a flow path cross section of the inner annular portion is set at a position lower than a second central axis of a cross section of the outer annular portion and is set at a position higher than a third central axis of a flow path cross section including the lowermost end of the curved flow path, 4. A wall-drainage siphon flush toilet according to claim 3, wherein the lower end of the annular expanded flow path is set at a position lower than the third central axis and higher than the lowermost end of the curved flow path.

5. The wall-drainage siphon-type flush toilet according to claim 1, wherein the lower flow path of the curved flow path includes the lowest end to form a pooling area, and at least a portion of this pooling area is positioned vertically below the inlet of the curved flow path that connects to the toilet-side connection part when viewed from above or from the side of the drain socket.

6. 2. A wall-drainage siphon flush toilet according to claim 1, wherein the lowest end of the curved flow path is located downstream of a wall surface formed on the inner periphery of and below the inlet of the curved flow path.

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