Water-washing toilet

Abstract

To provide a washing toilet bowl that can be installed even if a distance from a wall surface to a floor surface drain pipe is short.SOLUTION: A washing toilet bowl T1 comprises a drain socket 30 for connecting a toilet bowl 20 and a drain pipe 21 of the toilet bowl 20 with a floor surface drain pipe 12. The drain socket 30 has a toilet bowl connection part 31 to be connected with the drain pipe 21 of the toilet bowl 20, a bending tube 32 that is installed on the downstream side of the toilet bowl connection part 31 and that forms a curved flow channel with the rear side of a projected side, a connection pipe 33 that is installed on the downstream side of the bending tube 32 and that extends in the longitudinal direction and that is constituted by connecting at least two members 33D and 33D in the extension direction, and a floor connection part 35 that is installed on the downstream side of the connection pipe 33 and that is connected with the floor surface drain pipe 12. The toilet bowl 20 has right and left walls 24B, and an opening 25 for opening backward and preventing interference with the drain socket 30 is formed between the right and left walls 24B.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present disclosure relates to a flush toilet.

Background Art

[0002] Conventionally, a flush toilet equipped with a toilet bowl and a drain socket has been known. For example, the drain socket of the flush toilet described in Patent Document 1 below connects between the drain pipe of the toilet bowl and the drain pipe on the floor surface. The drain socket has a hanging pipe that hangs downward from the drain pipe of the toilet bowl, and an adjuster pipe that extends forward from the lower end of the hanging pipe. The length dimension of the adjuster pipe can be changed according to the positions of the drain pipe of the toilet bowl and the drain pipe on the floor surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The flush toilet having the above-described configuration has been difficult to install when the distance from the wall surface to the drain pipe on the floor surface is short.

[0005] The present disclosure has been completed based on the above circumstances, and an object thereof is to provide a flush toilet that can be installed even when the distance from the wall surface to the drain pipe on the floor is short.

Means for Solving the Problems

[0006] The flush toilet of the present disclosure is a flush toilet including a toilet bowl and a drain socket that connects the drain pipe of the toilet bowl and the drain pipe on the floor surface wherein the drain socket has a toilet connection portion connected to the drain pipe of the toilet bowl, and is provided on the downstream side of the toilet connection portion, and the rear side is ConvexIt comprises a curved pipe that forms a curved flow path, a connecting pipe provided downstream of the curved pipe and extending in the front-to-back direction, and composed of at least two members connected in the extending direction, and a floor connection portion provided downstream of the connecting pipe and connected to the floor drain pipe, The rear end of the upper surface of the connecting pipe is located behind the center of the upper opening edge formed on the horizontal plane at the upper end position of the toilet connection part, the front surface of the curved pipe is inclined and intersects with the central axis of the toilet connection part, the rear surface of the connecting body of the floor connection part is located in front of the rear end of the upper surface of the connecting pipe and behind the front end of the upper opening edge of the toilet connection part, and a part of the connecting body of the floor connection part overlaps with the area obtained by projecting the toilet connection part in the vertical direction. The toilet has left and right walls, and between the left and right walls ,before To prevent interference with the drain socket Opens to the rear It has an opening formed in it. [Brief explanation of the drawing]

[0007] [Figure 1] A cross-sectional view showing a flush toilet in Embodiment 1, installed in a toilet room. [Figure 2] Enlarged cross-sectional view of a toilet bowl showing the connected drain socket. [Figure 3] Rear view showing a flush toilet installed in a toilet room. [Figure 4] A partially enlarged cross-sectional view showing the rear end of a flush toilet, corresponding to the cross-section at position AA in Figure 1. [Figure 5] Partially enlarged bottom view showing the rear end of a flush toilet. [Figure 6] A cross-sectional view showing a flush toilet in Embodiment 2, installed in a toilet room. [Figure 7] Enlarged cross-sectional view of a toilet bowl showing the connected drain socket. [Figure 8] Rear view showing a flush toilet installed in a toilet room. [Figure 9] A cross-sectional view showing a flush toilet in Embodiment 3, installed in a toilet room. [Figure 10] A cross-sectional view showing a flush toilet, corresponding to the cross-section at position BB in Figure 9. [Figure 11] A cross-sectional view showing a flush toilet in Embodiment 4, installed in a toilet room. [Modes for carrying out the invention]

[0008] <Embodiment 1> As shown in Figure 1, the flush toilet T1 in this embodiment includes a toilet bowl 20 and a drain socket 30. The drain socket 30 connects the drain pipe of the toilet bowl 20 (referred to as the toilet bowl drain pipe 21) to a drain pipe provided on the floor surface 10 (referred to as the floor drain pipe 12). Hereinafter, for each component, the orientation of a person sitting in a normal posture on the toilet bowl 20 will be used as the reference, with the side facing the toilet room wall 11 (negative direction of the X-axis in Figure 1) being the rear side, the opposite side (positive direction of the X-axis in Figure 1) being the front side, the upper side (positive direction of the Y-axis in Figure 1) being the upper side, and the lower side (negative direction of the Y-axis in Figure 1) being the lower side. The positive direction of the Z-axis in Figure 3 will be referred to as the right side, and the negative direction of the Z-axis in Figure 3 will be referred to as the left side.

[0009] The toilet bowl 20 has a toilet bowl portion 22, a toilet drain pipe 21, a toilet drain portion 23, and an outer wall portion 24. The toilet bowl 20 is made of ceramic, and the toilet bowl portion 22, toilet drain pipe 21, toilet drain portion 23, and outer wall portion 24 are integrally formed.

[0010] The toilet drain section 23 includes a first downward channel 23A, an upward channel 23B, and a second downward channel 23C. The first downward channel 23A extends diagonally downward and backward from the bottom of the toilet bowl section 22. The upward channel 23B is continuous downstream of the first downward channel 23A and extends diagonally upward and backward. The boundary between the first downward channel 23A and the upward channel 23B is gently curved. The second downward channel 23C is continuous downstream of the upward channel 23B and hangs down in a substantially vertical direction. The boundary between the upward channel 23B and the second downward channel 23C is sharply curved. The downstream end of the second downward channel 23C opens vertically downward. The downstream end of the second downward channel 23C is formed in the toilet drain pipe 21. The toilet drain pipe 21 has a cylindrical shape. The toilet drain pipe 21 protrudes vertically downward from the rear end of the toilet bowl 20. The central axis 21A of the inner surface of the toilet drain pipe 21 (central axis of the inner diameter) is perpendicular to the floor surface 10 when the toilet bowl 20 is installed on the floor surface 10. The central axis 21A of the inner surface of the toilet drain pipe 21 is an axis that includes the center of the inner surface of the toilet drain pipe 21 in the front-to-back direction and the center of the inner surface of the toilet drain pipe 21 in the left-to-right direction.

[0011] The outer perimeter wall 24 has a front wall 24A, left and right walls 24B, and a rear wall 24C. The outer perimeter wall 24 surrounds the toilet bowl 22 and the toilet drain 23. The front wall 24A and the left and right walls 24B are slightly inclined inward from top to bottom. The lower end of the outer perimeter wall 24 contacts the floor surface 10 when the toilet 20 is installed. The left and right walls 24B are provided to the rear of the toilet drain pipe 21. When the flush toilet T1 is installed on the floor surface 10, the left and right walls 24B are positioned on both the left and right sides of the floor drain pipe 12. The left and right walls 24B extend in the vertical and front-to-back directions. An opening 25 that opens to the rear is formed between the left and right walls 24B. The opening 25 will be described in detail later.

[0012] As shown in Figure 2, the drain socket 30 includes a toilet bowl connection part 31, a curved pipe 32, a connecting pipe 33, a bent pipe 34, and a floor connection part 35.

[0013] The toilet connection part 31 is connected to the toilet drain pipe 21. The toilet connection part 31 has openings on both the top and bottom. The inner circumferential surface of the toilet connection part 31 is cylindrical. The toilet drain pipe 21 is inserted into the toilet connection part 31 from above. A packing 44 is fitted to the toilet connection part 31. The central axis of the surface where the packing 44 and the toilet drain pipe 21 come into contact (the outer circumferential surface of the toilet drain pipe 21) coincides with the central axis 21A of the inner circumferential surface of the toilet drain pipe 21.

[0014] As shown in Fig. 2, the central axis X (the central axis of the inner diameter) of the inner peripheral surface of the toilet connection part 31 is perpendicular to the horizontal plane when the drain socket 30 is connected to the floor drain pipe 12. The central axis X is also perpendicular to the horizontal plane in the connection state where the toilet drain pipe 21 is connected to the toilet connection part 31. The central axis X is an axis including the center in the front-rear direction and the center in the left-right direction of the inner peripheral surface of the toilet connection part 31. The central axis X of the toilet connection part 31 coincides with the central axis 21A of the toilet drain pipe 21 in the connection state where the toilet connection part 31 is connected to the toilet drain pipe 21. The central axis (the central axis of the outer diameter) of the outer peripheral surface of the toilet connection part 31 coincides with the central axis X of the toilet connection part 31. The central axis of the outer peripheral surface of the toilet connection part 31 is an axis including the center in the front-rear direction and the center in the left-right direction of the outer peripheral surface of the toilet connection part 31.

[0015] As shown in Fig. 2, the upper end opening edge 31A of the toilet connection part 31 is formed on the horizontal plane at the upper end position of the toilet connection part 31. The upper end opening edge 31A of the toilet connection part 31 is horizontal with respect to the floor surface 10. The center P7 of the upper end opening edge 31A of the toilet connection part 31 is located on the central axis X.

[0016] On the downstream side of the toilet connection part 31, a substantially horizontal first step surface 36 and a second step surface 37 are formed. The first step surface 36 is provided on the rear side of the toilet connection part 31. The first step surface 36 projects to the outer peripheral side of the toilet connection part 31. The second step surface 37 is provided on the front side of the toilet connection part 31. The second step surface 37 projects to the inner peripheral side of the toilet connection part 31.

[0017] The curved pipe 32 is continuously provided on the downstream side of the toilet connection part 31. The curved pipe 32 forms a curved flow path with the rear side being Convex curved in the connection state where the toilet connection part 31 is connected to the toilet drain pipe 21. As shown in Fig. 2, the center R of the flow path of the curved pipe 32 is curved with the front side being concave and the rear side being convex. The curved pipe 32 includes a vertical part 38 and a bent part 39.

[0018] The hanging portion 38 extends vertically when the toilet connection portion 31 is connected to the toilet drain pipe 21. The center R of the flow path of the hanging portion 38 slopes diagonally backward when the toilet connection portion 31 is connected to the toilet drain pipe 21. The front surface 41 of the hanging portion 38 slopes diagonally backward and intersects the central axis X. The front surface 41 of the hanging portion 38 has a vertical portion 41B and an inclined portion 41C. The vertical portion 41B is located at the upper end of the hanging portion 38. The inclined portion 41C is located below the vertical portion 41B. The rear surface 42 of the hanging portion 38 hangs down from the outer edge of the first stepped surface 36. The rear surface 42 of the hanging portion 38 is parallel to the central axis X.

[0019] The upper end opening edge 32A of the curved pipe 32 is formed on the horizontal plane at the upper end position of the hanging section 38. As shown in Figure 2, the upper end opening edge 32A of the curved pipe 32 extends from the upper end 42A of the rear surface 42 of the hanging section 38 to the upper end 41A of the front surface 41 of the hanging section 38. The upper end 42A of the rear surface 42 of the hanging section 38 and the upper end 41A of the front surface 41 of the hanging section 38 are located at the same height.

[0020] The bent portion 39 extends from the lower end opening edge 38A of the hanging portion 38 to the rear end opening edge 33A of the connecting pipe 33. The lower end opening edge 38A of the hanging portion 38 is formed on the horizontal plane at the lower end position of the hanging portion 38. The lower end position of the hanging portion 38 is the lower end position of the front surface 41 of the hanging portion 38, where the front surface 41 of the hanging portion 38 and the upper surface 33E of the connecting pipe 33 intersect.

[0021] The front end of the lower opening edge 38A of the hanging portion 38 (the rear end P2 of the upper surface 33E of the connecting pipe 33, described later) is located in front of the rear end of the upper opening edge 32A of the curved pipe 32 (the upper end 42A of the rear surface 42 of the hanging portion 38), as shown in Figure 2. The front end P2 of the lower opening edge 38A of the hanging portion 38 is located behind the center P3 of the upper opening edge 32A of the curved pipe 32. The front end P2 of the lower opening edge 38A of the hanging portion 38 is located behind the central axis X of the toilet connection portion 31. The rear end P1 of the lower opening edge 38A of the hanging portion 38 is located behind the rear surface 31C of the toilet connection portion 31.

[0022] The bent portion 39 has a first curved surface 39A that is continuous with the lower end of the rear surface 42 of the hanging portion 38. The first curved surface 39A is arc-shaped, centered on the lower end of the front surface 41 of the hanging portion 38 (the rear end P2 of the upper surface 33E of the connecting pipe 33, which will be described later). The lower end of the first curved surface 39A is connected to the rear end of the lower surface 33F of the connecting pipe 33.

[0023] As shown in Figure 2, the curved pipe 32 is provided with a constricted section 43. The flow path area of ​​the constricted section 43 is smaller than the flow path area of ​​the upper end opening edge 31A of the toilet connection section 31. The inner diameter dimension of the horizontal cross-section of the constricted section 43 is smaller than the inner diameter dimension of the upper end opening edge 31A of the toilet connection section 31. The constricted section 43 is provided near the lower end of the hanging section 38. As shown in Figure 4, the front-rear dimension L1 of the horizontal cross-section of the constricted section 43 is smaller than the left-right dimension L2. The front-rear dimension L1 is the maximum dimension in the front-rear direction of the horizontal cross-section of the constricted section 43. The left-right dimension L2 is the maximum dimension in the left-right direction of the horizontal cross-section of the constricted section 43.

[0024] As shown in Figure 2, the distance in the front-rear direction between the rear end P8 of the lower opening edge of the toilet drain pipe 21 and the front end P2 of the lower opening edge 38A of the hanging part 38 is small. Therefore, a siphon effect is likely to occur near the lower end of the hanging part 38, allowing flushing water to be drained forcefully. The statement that the distance in the front-rear direction between the rear end P8 of the lower opening edge of the toilet drain pipe 21 and the front end P2 of the lower opening edge 38A of the hanging part 38 is small means that the distance is within approximately 1 / 4 of the front-rear dimension of the lower opening edge of the toilet drain pipe 21.

[0025] The connecting pipe 33 is provided continuously downstream of the curved pipe 32. The rear end opening edge 33A of the connecting pipe 33 is formed on the vertical surface at the lower end of the first curved surface 39A. The front end opening edge 33B of the connecting pipe 33 is formed on the vertical surface at the front end of the lower surface 33F of the connecting pipe 33. The rear end opening edge 33A and the front end opening edge 33B of the connecting pipe 33 overlap with the area obtained by projecting the toilet connection portion 31 in the vertical direction. The rear end opening edge 33A of the connecting pipe 33 is located behind the central axis X of the toilet connection portion 31. The front end opening edge 33B of the connecting pipe 33 is located in front of the central axis X of the toilet connection portion 31.

[0026] The connecting pipe 33 extends horizontally so that drainage flows from rear to front when the toilet connection part 31 is connected to the toilet drain pipe 21. The central axis C of the connecting pipe 33 is horizontal. The central axis C of the connecting pipe 33 is the axis that includes the center of the inner surface of the connecting pipe 33 in the vertical direction and the center of the inner surface of the connecting pipe 33 in the left-right direction. The upper surface 33E and lower surface 33F of the connecting pipe 33 extend horizontally. The vertical width dimension of the connecting pipe 33 is constant.

[0027] The entire inner surface of the connecting pipe 33 is located in front of the rear end P6 of the upper opening edge 31A of the toilet connection part 31. The rear end P2 of the horizontally extending upper surface 33E of the connecting pipe 33 is located in front of the rear end P6 of the upper opening edge 31A of the toilet connection part 31. The front end of the horizontally extending upper surface 33E of the connecting pipe 33 is located in front of the center P7 of the upper opening edge 31A of the toilet connection part 31.

[0028] The connecting pipe 33 is formed by a first member 33C and a second member 33D that are connected in the extension direction. The first member 33C is integrally formed with the upstream member 30A, which will be described later. The second member 33D is integrally formed with the downstream member 30B, which will be described later.

[0029] The first member 33C and the second member 33D overlap radially and fit together. The first member 33C overlaps the inside of the second member 33D, and the second member 33D overlaps the outside of the first member 33C. In the connected state of the first member 33C and the second member 33D, the rear end of the second member 33D is located at the lower end of the front surface 41 of the curved pipe 32. The front end of the second member 33D is located at the front end of the first member 33C. The front end of the second member 33D is located in front of the rear surface 46A of the connecting body portion 46, which will be described later. The rear end of the second member 33D is located behind the lower end position of the first curved surface 39A. The length of the connecting pipe 33 can be changed by replacing the first member 33C and the second member 33D with members of a length corresponding to the positional relationship between the toilet drain pipe 21 and the floor drain pipe 12.

[0030] The bent pipe 34 is provided between the connecting pipe 33 and the floor connection portion 35. The bent pipe 34 extends from the front end opening edge 33B of the connecting pipe 33 to the upper end opening edge 32A of the floor connection portion 35. The upper end opening edge 35A of the floor connection portion 35 is formed on the floor surface 10. The bent pipe 34 has a second curved surface 34A. The second curved surface 34A is arc-shaped, centered on the front end of the lower surface 33F of the connecting pipe 33. The upper end of the second curved surface 34A is connected to the upper surface 33E of the connecting pipe 33. The lower end of the second curved surface 34A is connected to the front surface 46B of the connecting body portion 46 of the floor connection portion 35. An overhang portion 34B is provided at the lower end of the bent pipe 34. The overhang portion 34B covers the upper surface of the flange portion 45 via a gasket 47.

[0031] The floor connection section 35 is provided continuously downstream of the bent pipe 34. The floor connection section 35 is connected to the floor drain pipe 12. The central axis (outer diameter central axis) Y of the outer surface of the connection body section 46 of the floor connection section 35 is located in front of the central axis (inner diameter central axis) X of the toilet connection section 31.

[0032] The floor connection portion 35 has a connection body portion 46 and a flange portion 45. The connection body portion 46 is open on both the upper and lower sides. The outer circumferential surface of the connection body portion 46 is cylindrical. The central axis Y of the connection body portion 46 is perpendicular to the horizontal plane when the connection body portion 46 is connected to the floor drain pipe 12. The central axis Y is an axis that includes the center of the outer circumferential surface of the connection body portion 46 in the front-rear direction and the center of the outer circumferential surface of the connection body portion 46 in the left-right direction. A part of the connection body portion 46 overlaps with the area obtained by projecting the toilet connection portion 31 in the vertical direction. The connection body portion 46 is inserted into the inside of the floor drain pipe 12 from above. The protruding portion 34B covers the upper surface of the flange portion 45 via a gasket 47. The flange portion 45 is fixed to the floor surface 10 by a fastening member.

[0033] The drain socket 30 is formed by connecting two members (referred to as the upstream member 30A and the downstream member 30B). The upstream member 30A and the downstream member 30B are connected at the position of the connecting pipe 33. The upstream member 30A has a toilet bowl connection part 31, a curved pipe 32, and a first member 33C. The downstream member 30B has a second member 33D, a bent pipe 34, and a floor connection part 35. The bent pipe 34 and the floor connection part 35 are formed separately. The bent pipe 34 and the floor connection part 35 are joined by bolts and nuts (not shown).

[0034] The opening 25 of the toilet bowl 20 is formed in the rear wall 24C, as shown in Figure 3. The opening 25 extends to a position higher than the rearmost end position P1 of the flow path formed in the curved pipe 32 (see Figure 2). The rearmost end position P1 is the rearmost position in the curved region of the curved pipe 32. The rearmost end position P1 is the upper end of the first curved surface 39A and is also the rear end of the lower end opening edge 38A of the hanging portion 38. The rearmost end position P1 of the lower end opening edge 38A of the hanging portion 38 is located behind the center P7 of the upper end opening edge 31A of the toilet bowl connection portion 31 and the central axis X of the inner circumferential surface of the toilet bowl connection portion 31.

[0035] As shown in Figure 2, the opening 25 extends from the lower end of the outer peripheral wall portion 24 of the toilet bowl 20 to a position above the upper surface 33E of the connecting pipe 33. The upper end of the opening 25 is located below the upper end of the drain socket 30 (the upper end of the toilet bowl connection portion 31). The upper end of the opening 25 is located above the lower end of the toilet bowl drain pipe 21. The left-right dimension L3 of the opening 25 is larger than the left-right dimensions of the curved pipe 32 and connecting pipe 33 of the drain socket 30, as shown in Figure 3.

[0036] As shown in Figure 4, side walls 26 are provided on both the left and right sides of the opening 25. In other words, the space between the pair of left and right side walls 26 is the opening 25. The distance between the left and right side walls 26 in the left-right direction is the left-right dimension L3 of the opening 25. The side walls 26 are located closer to the center in the left-right direction than the left and right walls 24B of the toilet bowl 20. The side walls 26 and the left and right walls 24B are approximately parallel. The pair of side walls 26 are connected to the left and right walls 24B via a rear wall 27. As shown in Figure 5, the rear wall 27 is located behind the connecting body 46.

[0037] As shown in Figure 5, the left-right dimension L4 of the lower end of the opening 25 is greater than the left-right dimension L3 of the upper part of the opening 25 (the part between the opening side walls 26). The left-right dimension L4 of the lower end of the opening 25 is equivalent to the distance between the left and right walls 24B. The left-right dimension L4 of the lower end of the opening 25 is greater than the maximum left-right dimension L5 of the outer shape of the connecting body part 46 of the floor connection part 35. The left-right dimension L5 of the lower end of the opening 25 is greater than the maximum left-right dimension L6 of the outer shape of the flange part 45. The left-right dimension L4 of the lower end of the opening 25 is greater than the maximum left-right dimension L7 of the fixing part 34C of the protruding part 34B that is fixed to the floor surface 10. As a result, the protruding part 34B can be installed on the floor surface 10 without contacting the toilet bowl 20.

[0038] An example of the installation of the flush toilet T1 of this embodiment in a toilet room will be described. The toilet room is exemplified as having a distance of 200 mm between the center of the floor drain pipe 12 and the wall 11 (referred to as the floor drain pipe distance Lf). The toilet bowl 20 is installed at a position where the distance between the central axis 21A of the toilet drain pipe 21 and the wall 11 (referred to as the toilet drain pipe distance Lt) is 160 mm.

[0039] First, the drain socket 30 is fixed to the floor surface 10. Specifically, the floor connection part 35 is attached to the floor surface 10 first. The connecting body part 46 of the floor connection part 35 is fitted onto the floor drain pipe 12, and the flange part 45 is fixed to the floor surface 10 with a fastening member. Next, the bent pipe 34 is connected to the upstream member 30A, and a gasket 47 is attached to the lower surface of the overhang part 34B. The overhang part 34B is placed on top of the flange part 45, and the overhang part 34B and the flange part 45 are joined together with bolts and nuts (not shown). After that, the overhang part 34B is fixed to the floor surface 10 with screws S.

[0040] Next, the toilet bowl 20 is connected to the drain socket 30. Specifically, the toilet drain pipe 21 of the toilet bowl 20 is inserted into the toilet connection part 31 of the drain socket 30. Since the opening 25 of the toilet bowl 20 extends to a height above the lower end of the toilet drain pipe 21, the toilet bowl 20 can be connected to the drain socket 30 without lifting it high. The packing 44 is in close contact with the outer surface of the toilet drain pipe 21. The toilet bowl 20 is fixed to the floor surface 10 with fastening members (not shown). With this, the installation of the flush toilet T1 is completed.

[0041] The operation and effects of the embodiment configured as described above will now be explained. The flush toilet T1 comprises a toilet bowl 20 and a drain socket 30. The drain socket 30 has a toilet bowl connection part 31, a curved pipe 32, a connecting pipe 33, and a floor connection part 35. The toilet bowl connection part 31 is connected to the toilet drain pipe 21. The curved pipe 32 is provided downstream of the toilet bowl connection part 31. In the connected state where the toilet bowl connection part 31 is connected to the toilet drain pipe 21, the rear side of the curved pipe 32 is Convex A curved flow path is formed. The connecting pipe 33 is provided downstream of the curved pipe 32. The connecting pipe 33 extends horizontally when the toilet connection part 31 is connected to the toilet drain pipe 21. The connecting pipe 33 is formed by connecting a first member 33C and a second member 33D in the extending direction. The floor connection part 35 is provided downstream of the connecting pipe 33. The floor connection part 35 is connected to the floor drain pipe 12. The toilet 20 has left and right walls 24B. An opening 25 that opens to the rear is formed between the left and right walls 24B. The opening 25 extends to a position higher than the rearmost end position P1 of the flow path.

[0042] With this configuration, the curved pipe 32 allows the floor connection section 35 to be positioned close to the wall surface 11. The opening 25 formed in the toilet bowl 20 prevents contact between the curved pipe 32 and the toilet bowl 20. Therefore, the flush toilet T1 can be installed even if the distance from the wall surface 11 to the floor drain pipe 12 is short.

[0043] The opening 25 is formed in the rear wall 24C of the toilet bowl 20. By forming the opening 25 in the rear wall 24C, a portion of the drain socket 30 can be positioned to overlap the rear wall 24C in the vertical direction. This prevents contact between the rear wall 24C of the toilet bowl 20 and the drain socket 30, even if the position of the rear wall 24C of the toilet bowl 20 is shifted due to errors such as dimensional tolerances or manufacturing errors.

[0044] The curved pipe 32 is equipped with a constricted section 43 whose flow path area is smaller than the flow path area of ​​the upper opening edge 31A of the toilet bowl connection section 31. With this configuration, a siphon is generated in the constricted section 43, allowing water to be drained forcefully.

[0045] <Embodiment 2> Next, a flush toilet T2 according to Embodiment 2, which embodies the present disclosure, will be described with reference to Figures 6 to 8. The flush toilet T2 of this embodiment differs from Embodiment 1 in that the drain socket 50 is provided with an inlet 51 for hand-washing wastewater to flow in. Components similar to those in Embodiment 1 are denoted by the same reference numerals, and redundant explanations are omitted.

[0046] The drain socket 50, as in Embodiment 1, includes a toilet connection part 31, a curved pipe 32, a connecting pipe 33, and a floor connection part 35.

[0047] As shown in Figure 7, the drain socket 50 is provided with a hand-washing connection section 52 for connecting the hand-washing drain pipe H. The hand-washing connection section 52 protrudes from the rear surface 42 of the curved pipe 32. The internal space of the hand-washing connection section 52 communicates with an inlet 51 that opens along the rear surface 42 of the curved pipe 32. The inlet 51 is opened so that the direction in which the hand-washing drain flows into the curved pipe 32 is vertical. Hand-washing water flows from the hand-washing drain pipe H into the hand-washing connection section 52 and is discharged into the curved pipe 32 from the inlet 51. The inlet 51 is located near the lower end of the hanging portion 38 of the curved pipe 32.

[0048] As shown in Figure 7, the curved pipe 32 is provided with an extension 53. The extension 53 is continuous with the inner surface of the hand-washing connection 52. The extension 53 extends vertically downward from the first stepped surface 36 of the curved pipe 32. The extension 53 is parallel to the rear surface 42 of the curved pipe 32. An inlet 51 is formed at the lower end of the extension 53. The lower end of the extension 53 only needs to be located below the upper end of the inclined portion 41C of the front surface 41 of the curved pipe 32.

[0049] The hand-washing connection section 52 protrudes further back than the rearmost end position P1 of the flow path of the curved pipe 32. The hand-washing connection section 52 is positioned inward (forward) of the rear surface of the rear wall 24C of the toilet bowl 20. The opening 25 prevents the hand-washing connection section 52 from coming into contact with the rear wall 24C of the toilet bowl 20.

[0050] As described above, in this embodiment, similar to Embodiment 1, the rear side is Convex The curved pipe 32, which forms a curved flow path, allows the flush toilet T2 to be installed even when the distance from the wall surface 11 to the floor drain pipe 12 is short. The opening 25 formed in the toilet bowl 20 prevents contact between the hand-washing drain pipe H and the toilet bowl 20.

[0051] <Embodiment 3> Next, a flush toilet T3 according to Embodiment 3, which embodies the present disclosure, will be described with reference to Figures 9 and 10.

[0052] The toilet bowl 20 of the flush toilet T3 in this embodiment differs from Embodiment 1 in that it is equipped with a jet nozzle 61 that discharges flushing water downstream of the toilet drain 23. Components similar to those in Embodiment 1 are denoted by the same reference numerals, and redundant explanations are omitted.

[0053] The toilet bowl 20, like in Embodiment 1, is made of ceramic and integrally comprises a toilet bowl portion 22, a toilet bowl drain portion 23, and an outer peripheral wall portion 24. The toilet bowl drain portion 23, like in Embodiment 1, includes a first downward flow path 23A, an upward flow path 23B, and a second downward flow path 23C.

[0054] The outer perimeter wall 24 has a front wall 24A and left and right walls 24B. The outer perimeter wall 24 surrounds the toilet bowl 22 and the toilet drain 23. The lower end of the outer perimeter wall 24 contacts the floor surface 10 when the toilet 20 is installed. The left and right walls 24B are provided to the rear of the toilet drain pipe 21. When the flush toilet T3 is installed on the floor surface 10, the left and right walls 24B are positioned on both the left and right sides of the floor drain pipe 12.

[0055] As shown in Figure 10, a device storage compartment 63 for housing a water supply device 62 is provided on the rear side of the toilet bowl section 22. The device storage compartment 63 is located between the left and right walls 24B. The device storage compartment 63 is partitioned by the bottom wall 64 and the left and right walls 24B. The rear surface of the device storage compartment 63 is open.

[0056] As shown in Figure 10, the water supply device 62 is connected to a water supply pipe 65, a rim pipe 66, and a jet pipe 67. Water flowing from the water supply device 62 into the rim pipe 66 is discharged towards a rim water channel (not shown) provided around the upper edge of the toilet bowl 22. Water flowing from the water supply device 62 into the jet pipe 67 is discharged from the jet outlet 61.

[0057] The jet nozzle 61 is located on the front side of the first descending channel 23A. As shown by the arrow in Figure 9, the jet nozzle 61 discharges flushing water toward the lower surface of the ascending channel 23B. The discharged flushing water rises along the lower surface of the ascending channel 23B, carrying away waste and other debris. The flushing water collides with the upper surface of the second descending channel 23C and bounces downward. The flushing water flows from the upper surface of the second descending channel 23C toward the rear surface of the second descending channel 23C and flows vertically from the toilet drain pipe 21 into the curved pipe 32 of the drain socket 60. The flushing water generates a siphon effect at the constricted section 43 of the drain socket 60. As a result, the flushing water is drained forcefully.

[0058] Similar to Embodiment 1, the drain socket 60 has a small front-to-back distance between the rear end P8 of the lower opening edge of the toilet drain pipe 21 and the front end P2 of the lower opening edge 38A of the hanging portion 38. This configuration makes it easy to create a siphon effect near the front end P2 of the lower opening edge 38A of the hanging portion 38. After the siphon occurs, the siphon continues even if the flow rate from the jet outlet 61 is reduced, so the amount of water discharged from the jet outlet 61 can be suppressed. Therefore, the amount of water discharged from the jet outlet 61 can be made smaller than the amount of water discharged from the rim. Even if the toilet 20 is a washdown toilet, a siphon can be created near the front end P2 of the lower opening edge 38A of the hanging portion 38. A siphon can be created near the front end P2 of the lower opening edge 38A of the hanging portion 38 even without providing a constricting portion 43 in the drain socket 60.

[0059] As shown in Figure 10, the opening 25 is formed below the equipment storage section 63. The opening 25 is partitioned by the left and right walls 24B and the bottom wall 64. The opening 25 extends to a position higher than the upper end of the drain socket 60 (the upper end of the toilet connection section 31). The left-right dimension L8 of the opening 25 is greater than the left-right dimension of the protruding portion 34B of the drain socket 60 from the bottom end to the top end.

[0060] As described above, in this embodiment, similar to Embodiment 1, the flush toilet T3 can be installed even when the distance from the wall surface 11 to the floor drain pipe 12 is short. The toilet bowl 20 is equipped with a jet nozzle 61 that discharges flushing water downstream of the toilet bowl drain section 23. Therefore, the water from the toilet bowl drain section 23 can be forcefully discharged backward, allowing waste to be removed.

[0061] The T3 flush toilet prevents the water seal from breaking by controlling the jet flow so that a siphon occurs at the peak of the jet flow rate, and does not occur at other times.

[0062] <Embodiment 4> Next, a flush toilet T4 according to Embodiment 4, which embodies the present disclosure, will be described with reference to Figure 11.

[0063] The toilet bowl 20 of the flush toilet T4 in this embodiment differs from that of Embodiment 3 in that the toilet drain pipe 21 protrudes horizontally backward from the rear end of the toilet bowl 20. Components similar to those in Embodiment 3 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0064] The toilet bowl 20, like in Embodiment 3, is made of ceramic and integrally comprises a toilet bowl portion 22, a toilet bowl drain portion 23, and an outer peripheral wall portion 24. The toilet bowl drain portion 23 is equipped with a first downward flow path 23A and an upward flow path 23B. The downstream end of the toilet bowl drain portion 23 is formed into the toilet bowl drain pipe 21. The toilet bowl drain pipe 21 is cylindrical in shape. The toilet bowl drain pipe 21 protrudes horizontally backward from the rear end of the toilet bowl 20. The jet outlet 61, like in Embodiment 3, is provided on the front side of the first downward flow path 23A. As indicated by the arrow in Figure 11, the jet outlet 61 discharges flushing water toward the lower surface of the upward flow path 23B of the toilet bowl drain portion 23.

[0065] The drain socket 70, like in Embodiment 3, includes a toilet bowl connection part 31, a curved pipe 32, a connecting pipe 33, and a floor connection part 35. The drain socket 70 has a continuous pipe 71 between the toilet bowl connection part 31 and the curved pipe 32.

[0066] The toilet connection part 31 is connected to the toilet drain pipe 21. The toilet connection part 31 has openings on both the front and rear sides. The inner circumferential surface of the toilet connection part 31 is cylindrical. The toilet drain pipe 21 is inserted into the toilet connection part 31 from the front. A packing 37A is fitted to the toilet connection part 31.

[0067] The central axis (central axis of the inner diameter) X1 of the inner circumferential surface of the toilet connection part 31 is parallel to the horizontal plane when the toilet connection part 31 is connected to the toilet drain pipe 21. The central axis X1 is an axis that includes the center of the inner circumferential surface of the toilet connection part 31 in the vertical direction and the center of the inner circumferential surface of the toilet connection part 31 in the horizontal direction.

[0068] The continuous pipe 71 is provided continuously downstream of the toilet connection section 31. The continuous pipe 71 extends vertically when the toilet connection section 31 is connected to the toilet drain pipe 21. The flow path formed within the continuous pipe 71 descends vertically when the toilet connection section 31 is connected to the toilet drain pipe 21.

[0069] The rear surface 72 on the inner circumferential surface of the continuous pipe 71 has a rear upper surface 72A and a rear lower surface 72B. The rear upper surface 72A extends diagonally rearward from the upper end of the toilet connection part 31. The rear lower surface 72B extends vertically downward from the lower end of the rear upper surface 72A. The lower end of the rear lower surface 72B is continuous with the upper end of the rear surface 42 of the hanging part 38 via the inclined surface 73 and the first stepped surface 36. The inclined surface 73 prevents air from accumulating below the first stepped surface 36. This configuration is particularly effective in siphon toilets. The inclined surface 73 only needs to have a structure that makes it difficult for air to accumulate below the first stepped surface 36, for example, a curved surface. The front surface 74 of the continuous pipe 71 hangs vertically downward from the lower end of the toilet connection part 31. The lower end of the front surface 74 of the continuous pipe 71 is continuous with the upper end of the front surface 41 of the curved pipe 32.

[0070] The central axis 71A of the continuous pipe 71 is located behind the central axis Y of the floor connection portion 35. The central axis 71A of the continuous pipe 71 is an axis that includes the center between the lower rear surface 72B and the front surface 74 of the continuous pipe 71, and the center in the left-right direction of the inner circumferential surface of the lower part of the continuous pipe 71. The lower part of the continuous pipe 71 has a lower rear surface 72B.

[0071] The lower rear portion 72B of the continuous pipe 71 is at the same position in the front-rear direction as the front end position P2 of the lower end opening edge 38A of the hanging portion 38. The lower rear portion 72B of the continuous pipe 71 may be located behind the front end position P2 of the lower end opening edge 38A of the hanging portion 38.

[0072] The lower rear surface 72B of the continuous pipe 71 is located behind the rear surface 46A of the floor connection portion 35. The rear end opening edge 31B of the toilet connection portion 31 is located behind the central axis Y of the floor connection portion 35. The rear end opening edge 31B of the toilet connection portion 31 is formed on the vertical surface at the rear end position of the toilet connection portion 31. The rear end opening edge 31B of the toilet connection portion 31 is perpendicular to the floor surface 10.

[0073] The flushing water discharged from the jet outlet 61 rises along the underside of the rising channel 23B, transporting waste and other debris, as shown by the arrows in Figure 11. The flushing water is discharged diagonally upward and backward from the toilet drain pipe 21, collides with the upper rear surface 72A of the continuous pipe 71, and bounces back downward. The flushing water flows down to the lower rear surface 72B of the continuous pipe 71 and into the curved pipe 32.

[0074] The front end P2 of the lower end opening edge 38A of the hanging portion 38 of the drain socket 70 is located behind the lower rear surface 72B of the continuous pipe 71. Therefore, similar to Embodiment 3, a siphon effect is likely to occur near the front end P2 of the lower end opening edge 38A of the hanging portion 38. After the siphon occurs, the siphon continues even if the flow rate from the jet outlet 61 is reduced, so the amount of water discharged from the jet outlet 61 can be reduced. Therefore, the amount of water discharged from the jet outlet 61 can be made smaller than the amount of water discharged from the rim. Even if the toilet bowl 20 is a washdown toilet, a siphon can be created near the front end P2 of the lower end opening edge 38A of the hanging portion 38. A siphon can be created near the front end P2 of the lower end opening edge 38A of the hanging portion 38 even without providing a constriction portion 43 in the drain socket 60.

[0075] As described above, in this embodiment, similar to Embodiment 3, the flush toilet T4 can be installed even when the distance from the wall surface 11 to the floor drain pipe 12 is short. The toilet 20 is equipped with a jet nozzle 61 that discharges flushing water downstream of the toilet drain section 23. Therefore, the water from the toilet drain section 23 can be forcefully discharged backward, allowing waste to be removed.

[0076] <Other Embodiments> This disclosure is not limited to the embodiments described above and in the drawings, and the technical scope of this disclosure also includes, for example, the following embodiments. (1) In the above embodiment, the floor connection portion 35 is located in front of the toilet connection portion 31. However, the floor connection portion may be located behind the toilet connection portion. (2) In the above embodiment, the rear end P2 of the upper surface 33E of the connecting pipe 33 is located behind the center P3 of the upper end opening edge 32A of the curved pipe 32. However, the rear end of the upper surface of the connecting pipe may be located in front of the center of the upper end opening edge of the curved pipe. (3) In the above embodiment, the curved tube 32 is provided with a constricted portion 43. However, the curved tube is not limited to this and does not need to be provided with a constricted portion. (4) In the above embodiment, the connecting pipe 33 is formed by the first member 33C and the second member 33D. However, the connecting pipe may be formed by one member or by three or more members. (5) In the above embodiment, the length of the connecting pipe 33 can be changed by replacing the first member 33C and the second member 33D with members of a length corresponding to the positional relationship between the toilet drain pipe 21 and the floor drain pipe 12. However, the connecting pipe may also have the first member and the second member as long members and the length can be changed by cutting these members, or it may have other members connected between the first member and the second member and the length can be changed by cutting these other members. (6) In embodiments 1 to 3 described above, the rear surface 42 of the hanging portion 38 is parallel to the central axis X. However, the rear surface of the hanging portion may be inclined with respect to the central axis X. (7) In the above embodiment, the opening 25 opens upward from the lower end of the outer peripheral wall portion 24 of the toilet bowl 20. However, the opening may be limited to the middle portion in the vertical direction of the outer peripheral wall portion. (8) In the above embodiment, the connecting pipe 33 extends horizontally. However, the connecting pipe is not limited to this and may include those that are slightly inclined. (9) In the above embodiment, the left and right walls 24B are formed integrally with the toilet bowl portion 22, etc. However, the left and right walls may be side covers formed separately from the toilet bowl. (10) In embodiments 1 to 3 described above, the front end P2 of the lower end opening edge 38A of the hanging portion 38 is located in front of the rear end P8 of the lower end opening edge of the toilet drain pipe 21. However, the front end P2 of the lower end opening edge 38A of the hanging portion 38 may be located behind the rear end P8 of the lower end opening edge of the toilet drain pipe 21. Even with such a configuration, a siphon effect can be easily created. [Explanation of Symbols]

[0077] T1, T2, T3, T4... Flush toilet bowl, P1... Rearmost position of the curved flow path, P7... Center of the upper opening edge, 12... Floor drain pipe, 20... Toilet bowl, 21... Toilet bowl drain pipe (drain pipe for the toilet bowl), 22... Toilet bowl section, 23... Toilet bowl drain section, 24B... Left and right walls, 24C... Rear wall, 25... Opening, 30, 50, 60, 70... Drain socket, 31... Toilet bowl connection section, 31A... Upper opening edge, 32... Curved pipe, 33... Connecting pipe, 33C... First member, 33D... Second member, 35... Floor connection section, 43... Constriction section, 51... Inlet, 61... Jet outlet

Claims

1. A flush toilet comprising a toilet bowl and a drain socket connecting the toilet bowl's drain pipe and the floor drain pipe, The aforementioned drain socket is The toilet connection part is connected to the drain pipe of the toilet, A curved pipe is provided downstream of the toilet connection section, and its rear end is curved in a convex shape to form a flow path. A connecting pipe is provided downstream of the curved pipe, extends in the front-rear direction, and is configured by having at least two members connected in the extending direction, It has a floor connection portion provided downstream of the connecting pipe and connected to the floor drain pipe, The rear end of the upper surface of the connecting pipe is located behind the center of the upper end opening edge formed on the horizontal plane at the upper end position of the toilet connection part, and the front surface of the curved pipe is inclined and intersects with the central axis of the toilet connection part. The rear surface of the connecting body of the floor connection is located in front of the rear end of the upper surface of the connecting pipe and behind the front end of the upper opening edge of the toilet connection, and a part of the connecting body of the floor connection overlaps with the area obtained by projecting the toilet connection in the vertical direction. The aforementioned toilet has left and right walls, A flush toilet having a rearward-facing opening formed between the left and right walls to prevent interference with the drain socket.

2. The flush toilet according to claim 1, wherein the opening extends to a position higher than the rearmost end of the curved flow path.

3. The toilet bowl has a rear wall, The toilet bowl according to any one of claims 1 to 2, wherein the opening is formed in the rear wall.

4. The flush toilet according to claim 3, wherein a portion of the curved pipe is located behind the rear wall.

5. The flush toilet according to any one of claims 1 to 4, wherein the central axis of the floor connection portion is located in front of the central axis of the toilet connection portion.

6. The flush toilet according to any one of claims 1 to 5, wherein the curved pipe has a constricted portion having a flow path area smaller than the flow path area of ​​the upper end opening edge formed on the horizontal surface at the upper end position of the toilet connection portion.

7. The toilet according to any one of claims 1 to 6, comprising: a toilet bowl; a toilet drain extending rearward from the bottom of the toilet bowl; and a jet nozzle for discharging flushing water downstream of the toilet drain.

8. The flush toilet according to any one of claims 1 to 7, wherein the drain socket is provided with an inlet for hand-washing drainage.

9. A flush toilet comprising a toilet bowl and a drain socket connecting the toilet bowl's drain pipe and the floor drain pipe, The aforementioned drain socket is The toilet connection part is connected to the drain pipe of the toilet, A curved pipe is provided downstream of the toilet connection section, and its rear end is curved in a convex shape to form a flow path. A connecting pipe is provided downstream of the curved pipe, extends in the front-rear direction, and is configured by having at least two members connected in the extending direction, It has a floor connection portion provided downstream of the connecting pipe and connected to the floor drain pipe, The rear end of the upper surface of the connecting pipe is located behind the center of the upper end opening edge formed on the horizontal plane at the upper end position of the toilet connection part, and the front surface of the curved pipe is inclined and intersects with the central axis of the toilet connection part. The rear surface of the connecting body of the floor connection is located in front of the rear end of the upper surface of the connecting pipe and behind the front end of the upper opening edge of the toilet connection, and a part of the connecting body of the floor connection overlaps with the area obtained by projecting the toilet connection vertically.

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