Flush toilet bowl drainage unit

Abstract

Provided is a flush toilet bowl drainage unit in which manufacturing costs and assembly man-hours for manufacturing a cap, packing, etc., are suppressed. This flush toilet bowl drainage unit comprises: a toilet bowl-side drainage path connection part that can be connected to a toilet bowl-side drainage path through which toilet bowl drainage from a toilet bowl flows; a hand washing-side drainage path connection part (6) that can be connected to a hand washing-side drainage path through which hand washing drainage from a hand washing basin flows; a drainage merging part in which the toilet bowl drainage and the hand-washing drainage merge; and a sealing part (10) that separates the inside and outside of the hand washing-side drainage path connection part. The sealing part (10) and the hand washing-side drainage path connection part are integrally molded.

Description

Flush toilet drainage unit

[0001] The present disclosure relates to a water closet drainage unit.

[0002] Traditionally, hand-washing basins in toilet rooms are installed above a flush tank mounted at the rear of the toilet, allowing people to wash their hands after using the toilet using water stored in the flush tank for use in flushing the toilet. However, because the wastewater from hand-washing is then used to flush the toilet, people are reluctant to wash their hands with detergent or other liquids, which could result in detergent being included in the flush water. Furthermore, toilets that do not have a flush tank at the rear of the toilet are becoming more common. For this reason, in recent years, there has been an increase in the number of toilet rooms 100 that are equipped with a separate hand-washing basin 30 in addition to the flush toilet, as shown in Figure 6.

[0003] In this case, it is common to provide a separate hand-washing drainage path 34 for the hand-washing drainage of the hand-washing basin, separate from the toilet-side drainage path for the toilet bowl, but this method requires piping work inside the building, which is time-consuming. For this reason, it has recently become preferable to merge the hand-washing drainage path 34 for the hand-washing drainage of the hand-washing basin 30 with the toilet-side drainage path, so that the hand-washing drainage and the toilet drainage can be discharged together (for example, see Patent Document 1).

[0004] Incidentally, in toilets in which hand-washing drainage and toilet drainage can generally be flushed together, including those disclosed in Patent Document 1, when a separate hand-washing basin is not provided in the toilet room 100, and the hand-washing side drainage path 34 is not connected to the hand-washing side drainage path connection part 6, as shown in Figure 7, the hand-washing side drainage path connection part 6 of the toilet is covered by a cap 51 and a gasket 52 that are separate from the hand-washing side drainage path connection part 6, thereby preventing backflow of toilet drainage flowing through the toilet side drainage path and leakage of odors.

[0005] Figure 7 shows the means for separating the trap section storage section 3 from the outside of the drainage unit at the hand-washing side drainage path connection section 6. As shown in Figure 7, this has traditionally been separated by a packing 52 and a cap 51, and when installing a hand-washing basin 30 in the toilet room 100, the installer would remove the cap 51 and packing 52 and connect the hand-washing side drainage path 34.

[0006] JP 2008-291612 A

[0007] However, if the lid is attached using a cap 51 and a gasket 52 that are separate from the hand-washing side drainage path connection part 6, the manufacturing costs and assembly man-hours for producing the cap 51 and the gasket 52 are inconvenient for the manufacturer.

[0008] In view of the above-mentioned problems, the present disclosure aims to provide a flush toilet drainage unit that reduces the manufacturing costs and assembly man-hours required to manufacture the cap 51 and the gasket 52.

[0009] The flush toilet drainage unit of the present disclosure comprises a toilet side drainage path connection part that can be connected to a toilet side drainage path through which toilet drainage from the toilet bowl flows, a hand wash side drainage path connection part that can be connected to a hand wash side drainage path through which hand wash drainage from the hand wash basin flows, a drainage junction part where the toilet drainage and the hand wash drainage join together, and a sealing part that separates the inside and outside of the hand wash side drainage path connection part, and the sealing part and the hand wash side drainage path connection part are integrally molded.

[0010] FIG. 3A is a cross-sectional view showing a flush toilet drainage unit according to embodiment 1 of the present disclosure; FIG. 3B is a cross-sectional view of the upper part of the drainage case of the flush toilet drainage unit; FIG. 3C is an enlarged view of the relevant sealing portion of the flush toilet drainage unit, with FIG. 3A being a front view and FIG. 3B being a cross-sectional view seen from the side; FIG. 3D is a diagram showing a flush toilet drainage unit according to embodiment 2 of the present disclosure, with FIG. 4A being a side cross-sectional view of the flush toilet drainage unit and FIG. 4B being a view of the flush toilet drainage unit from the rear; FIG. 3E is a schematic diagram of a drainage socket according to embodiment 3 of the present disclosure; FIG. 3F is a general view of a conventional toilet room; FIG. 3G is a diagram showing the upper part of a conventional flush toilet drainage unit case;

[0011] Hereinafter, embodiments of a flush toilet drainage unit according to the present disclosure will be described with reference to the drawings. Note that the embodiments disclosed below are all examples and are not intended to impose any limitations on the flush toilet drainage unit according to the present disclosure.

[0012] In addition, in the embodiments disclosed below, more detailed explanation than necessary may be omitted in order to avoid unnecessary redundancy in the explanation and to facilitate understanding by those skilled in the art.

[0013] (Overall Configuration) FIG. 1 is a cross-sectional view showing a flush toilet drainage unit 1 according to an embodiment of the present disclosure.

[0014] This first embodiment discloses a movable trap type flush toilet drainage unit 1. The flush toilet drainage unit 1 is covered by a case body 2, and a trap section 4 is housed inside the case body 2. The trap section 4 will be described later.

[0015] The case body 2 is preferably of an airtight structure to prevent odor leakage from the sewer pipe.

[0016] In the flush toilet drainage unit 1 shown in Figure 1, the case body 2 has a through-hole 5 through which the trap section 4 passes, with one end of the trap section 4 exposed to the outside of the case body 2. In this case, the upstream opening 4a of the trap section 4 is exposed to the outside of the case body 2.

[0017] One end of the trap section 4 exposed to the outside of the case body 2 becomes the toilet-side drainage path connection section 7. A toilet-side drainage path 35 provided in the toilet bowl (not shown) of the toilet body 31 (see FIG. 7 ) is connected to the toilet-side drainage path connection section 7, and accumulated water in the toilet body 31 flows from the upstream opening 4a of the trap section 4 into the trap section storage section 3, which is inside the flush toilet drainage unit 1. Furthermore, the trap section 4 does not necessarily have to pass through the case body 2, and the trap section 4 may be completely stored inside the case body 2.

[0018] In this case, toilet wastewater or accumulated water that has passed through the through-hole 5 of the case body 2 flows into the trap portion 4 from the upstream opening 4 a of the trap portion 4 .

[0019] Hereinafter, the side of the flush toilet drainage unit 1 facing the toilet body 31 will be referred to as the front side, and the side opposite the toilet body 31 will be referred to as the rear side of the flush toilet drainage unit 1.

[0020] Case body 2 is also provided with a hand-washing-side drainage path connection 6. Hand-washing-side drainage path 34 (see FIG. 6 ) extending from hand-washing basin 30 provided adjacent to toilet room 100 is connected to hand-washing-side drainage path connection 6, and hand-washing wastewater discharged from hand-washing basin 30 flows into trap portion storage section 3 inside flush toilet drainage unit 1.

[0021] 2 is a cross-sectional view of the upper part of the flush toilet drainage unit 1. The hand-washing side drainage path connection part 6 has a cylindrical structure, and inside the hand-washing side drainage path connection part 6 there is provided a sealing part 10 that separates the trap part storage part 3 from the outside of the flush toilet drainage unit 1. The sealing part 10 will be described later.

[0022] 1, the case body 2 is further provided with a drain outlet 8. Toilet wastewater flowing from the downstream opening 4b of the trap section 4 into the trap section housing section 3 and hand-washing wastewater flowing from the hand-washing-side drainage path 34 into the trap section housing section 3 are discharged through the drain outlet 8 to the outside of the flush toilet drainage unit 1.

[0023] At this time, the toilet wastewater discharged from the downstream opening 4b and the hand-washing wastewater discharged from the hand-washing-side drainage path 34 merge inside the trap portion storage section 3. This merging point is the wastewater merging section 9. The wastewater merging section 9 is often located near the drain outlet 8, but it may be located away from the drain outlet 8.

[0024] In the embodiment shown in FIG. 1, the drain port 8 is provided on the bottom surface 1a of the flush toilet drain unit 1, that is, on the floor side.

[0025] By providing the drain outlet 8 on the bottom portion 1a, it is possible to utilize gravity to efficiently discharge toilet wastewater and hand washing wastewater.

[0026] Furthermore, the hand-washing side drainage path connection part 6, the toilet side drainage path connection part 7, and the drain outlet 8 are preferably formed in a cylindrical shape. Furthermore, although the hand-washing side drainage path connection part 6, the toilet side drainage path connection part 7, and the drain outlet 8 are preferably circular cylindrical, they may be cylindrical shapes other than circular, or may have shapes other than cylindrical. The hand-washing side drainage path connection part 6, the toilet side drainage path connection part 7, and the drain outlet 8 may be cylindrical shapes such as oval or square, for example.

[0027] Furthermore, it is preferable that the hand-washing-side drainage path connection part 6 is provided at a position higher than the drain outlet 8. This makes it easier for the hand-washing drainage water that flows from the hand-washing-side drainage path 34 into the trap portion storage part 3 to flow into the drain outlet 8.

[0028] The hand-washing-side drainage path connector 6 is preferably provided on the rear side of the flush toilet drainage unit 1. This makes it easier to connect the hand-washing-side drainage path 34 extending from the hand-washing basin 30 without the toilet body 31 getting in the way.

[0029] Furthermore, since the toilet-side drainage path connection part 7 is connected to the toilet body 31, the front side on the toilet body 31 side is preferable.

[0030] However, the arrangement of the toilet-side drainage path connector 7, the hand-washing-side drainage path connector 6, and the drain outlet 8 is not limited to the above embodiment, and may be on other surfaces.

[0031] The flush toilet drainage unit 1 shown in Figure 2 is provided with a shielding portion 36. The shielding portion 36 will be described later.

[0032] As shown in Figure 1, a movable trap-type flush toilet drainage unit 1 includes a trap portion 4 whose free end 4c rotates up and down. When the free end 4c of the trap portion 4 faces upward, water can be collected in the toilet bowl portion (not shown). When the free end 4c of the trap portion 4 faces downward, water can be drained from the toilet bowl portion (not shown) and waste can be discharged from the toilet bowl portion (not shown). When the free end 4c of the trap portion 4 faces downward, collected water in the toilet bowl portion (not shown) flows into the trap portion 4 and then into the drain port 8 to be discharged.

[0033] The trap section 4 is a tubular member with a bellows structure, one end of which serves as the toilet-side drainage path connector 7 connected to the toilet body 31, and the other end of which serves as a free end 4c that can rotate up and down. The free end 4c is rotated up and down by a drive unit 4d.

[0034] As shown in FIG. 6 , the hand-washing side drainage path 34 extending from the hand-washing basin 30 is connected to the hand-washing side drainage path connection portion 6 of the flush toilet drainage unit 1 .

[0035] As a result, the hand-washing wastewater generated by washing hands in the hand-washing basin 30 passes through the hand-washing-side drainage path 34 and flows from the hand-washing-side drainage path connection part 6 into the trap part housing part 3 inside the flush toilet drainage unit 1. The hand-washing wastewater that flows into the trap part housing part 3 merges with the toilet-side wastewater that is discharged from the downstream opening 4b of the trap part 4 at the drainage junction part. The merged water is discharged from the drain outlet 8 into the drainage path (not shown).

[0036] 3A and 3B are enlarged views of the hand-washing-side drainage path connection part 6 as seen from the outside of the flush toilet drainage unit 1. More specifically, Fig. 3A is a front view, and Fig. 3B is a cross-sectional view as seen from the side.

[0037] Inside the hand-washing side drainage path connection part 6 , a sealing part 10 is provided which separates the trap part storage part 3 inside the flush toilet drainage unit 1 from the outside of the flush toilet drainage unit 1 .

[0038] The sealing portion 10 is provided inside the hand-washing side drainage path connecting portion 6 and is connected to the inner periphery 6a of the hand-washing side drainage path connecting portion 6.

[0039] By providing the sealing portion 10, when the hand-washing side drainage path 34 is not connected to the hand-washing side drainage path connection portion 6, such as when there is no hand-washing basin 30 in the toilet room 100, it is possible to prevent odors from the toilet drainage from leaking to the outside through the hand-washing side drainage path connection portion 6.

[0040] Furthermore, the sealing portion 10 is not provided as a separate body from the hand-washing side drainage path connecting portion 6, such as a cap 51 (see FIG. 7), but is molded integrally with the hand-washing side drainage path connecting portion 6.

[0041] This makes it possible to save the cost of parts and manufacturing steps required to manufacture the sealing portion 10 as a separate body.

[0042] In a conventional flush toilet drainage unit 1 as shown in Figure 7, when the inside and outside of the hand-washing side drainage path connection part 6 are separated by a cap 51, there is an advantage in that the cap 51 can be opened and closed many times and is reusable, but once the hand-washing side drainage path 34 is connected, it is rarely removed, and once removed, the cap 51 is rarely put back on.

[0043] Therefore, by integrally molding the sealing portion 10 with the hand-washing side drainage path connecting portion 6, costs can be reduced and no disadvantages arise.

[0044] On the other hand, if the connection between the hand-washing side drainage path connection part 6 and the hand-washing side drainage path 34 becomes unnecessary, for example by removing the hand-washing basin installed in the toilet room 100, the structure may be such that the trap part storage part 3 can be separated from the outside of the flush toilet drainage unit 1 again using a cap 51 and a gasket 52.

[0045] 2, 3A, and 3B, a knob 11 is provided on the upper side of the sealing portion 10 when viewed from the front. The knob 11 extends from the sealing portion 10 so as to protrude outward from the flush toilet drainage unit 1. A user can grasp and pull the knob 11 to detach the sealing portion 10 from the hand-washing-side drainage path connector 6. This opens up the path connecting the outside of the flush toilet drainage unit 1 to the trap portion housing 3, and connects the hand-washing-side drainage path 34 to the hand-washing-side drainage path connector 6 from the hand-washing basin 30, allowing hand-washing water to be drained via the flush toilet drainage unit 1.

[0046] The protruding height of the knob 11 is molded to a height that fits inside the cylinder of the hand-washing side drainage path connector 6. This prevents the sealing part 10 from coming off the hand-washing side drainage path connector 6 when the knob 11 hits or gets caught on other parts, etc., during installation of the flush toilet drainage unit 1, etc.

[0047] In addition, if the height of the hand-washing side drainage path connection part 6 is low, the height may be such that the knob part 11 protrudes from inside the cylinder.

[0048] Furthermore, as shown in FIG. 3A , the knob portion 11 is formed in a triangular shape extending outward from the hand-washing-side drainage path connection portion 6. By forming the knob portion 11 in a triangular shape extending outward from the hand-washing-side drainage path connection portion 6, it becomes easier to grasp the knob portion 11 with one's hand, making it easier to remove the sealing portion 10 from the hand-washing-side drainage path connection portion 6. In this embodiment, the knob portion 11 is triangular extending outward from the hand-washing-side drainage path connection portion 6, but it does not have to be triangular. For example, the cross section of the knob portion 11 when cut perpendicular to the protrusion direction may be square or circular. Furthermore, the knob portion 11 does not necessarily have to be triangular extending outward; the knob portion 11 may be triangular extending inward.

[0049] When the sealing part 10 is detached from the hand-washing side drainage path connection part 6 and the hand-washing side drainage path 34 is connected to the hand-washing side drainage path connection part 6, the hand-washing drainage flows into the trap part storage part 3 inside the flush toilet drainage unit 1 and is then discharged from the drain outlet 8.

[0050] Furthermore, as shown in Figures 3A and 3B, the portion of the sealing portion 10 near the connection portion 14 between the sealing portion 10 and the hand washing side drainage path connection portion 6 is a thin-walled portion 12 that is molded thinner than other portions.

[0051] Furthermore, the case body 2 and the sealing portion 10 are integrally molded by injection molding. When integrally molding by injection molding, it is common to narrow the gap in the mold at the portion that will become the thin-walled portion 12 so that the thin-walled portion 12 is molded, but it is also possible to widen the gap in the mold when filling the resin, and then form the thin-walled portion 12 by compression or the like after molding.

[0052] The width of the thin-walled portion 12 is molded to about 1 mm from the inner periphery 6a of the hand-washing-side drainage path connecting portion 6 to the inside. It is preferable to change the width appropriately depending on the size and molding material of the hand-washing-side drainage path connecting portion 6.

[0053] By making a part of the connection portion 14 between the sealing portion 10 and the hand-washing-side drainage path connection portion 6 a thin-walled portion 12, it becomes easier to detach the sealing portion 10 from the hand-washing-side drainage path connection portion 6. Furthermore, if a knob portion 11 is provided near the thin-walled portion 12, it becomes easier to detach the sealing portion 10, but the knob portion 11 may also be provided near the center of the sealing portion 10.

[0054] Furthermore, the thin-walled portion 12 constitutes the entire connection portion 14 between the sealing portion 10 and the hand-washing side drainage path connection portion 6, but it does not necessarily have to be the entire thin-walled portion 12; it may be only a portion.

[0055] The thickness of the thin portion 12 is preferably 0.1 to 0.4 mm. More preferably, the thickness of the thin portion 12 is 0.1 to 0.3 mm. Furthermore, the thickness of the thin portion 12 is even more preferably 0.1 to 0.2 mm.

[0056] The thickness of the sealing portion 10 other than the thin-walled portion 12 is preferably 0.5 to 1.0 mm. Furthermore, the thickness of the sealing portion 10 other than the thin-walled portion 12 is preferably 0.6 to 0.9 mm. Furthermore, the thickness of the sealing portion 10 other than the thin-walled portion 12 is preferably 0.7 to 0.8 mm.

[0057] Furthermore, the width and thickness of the thin-walled portion 12 may be appropriately designed so as to be able to withstand the pressure inside the case body 2 .

[0058] A recessed portion 13 is provided below the knob portion 11 of the sealing portion 10. The recessed portion 13 is formed to be thin, similar to the thin-walled portion 12. The thickness of the recessed portion 13 does not need to be exactly the same as that of the thin-walled portion 12, but it is preferable that it be approximately the same.

[0059] The recessed portion 13 makes it easier to detach the sealing portion 10 from the hand washing side drainage path connecting portion 6.

[0060] Furthermore, it is preferable that the horizontal length of the recessed portion 13 is longer than the horizontal width of the knob portion 11 .

[0061] The vertical length of the recessed portion 13 is set to about 2 mm, but it is desirable to change the vertical length of the recessed portion 13 appropriately depending on the molding material of the hand washing side drainage path connection portion 6 and the sealing portion 10.

[0062] By having a recessed portion 13 at the bottom of the handle portion 11, it is possible to easily detach the sealing portion 10 from the hand washing side drainage path connection portion 6 by holding the handle portion 11 and applying force in the direction of the recessed portion 13.

[0063] The distance from the bottom end of the knob portion 11 to the recessed portion 13 is preferably about 0.5 mm, but it may be further away or closer.

[0064] Furthermore, as shown in Figure 2, even if toilet wastewater whose flow has been obstructed by waste accumulated in the toilet side drainage path 35 or trap section 4 attempts to flow back into the hand-washing side drainage path 34, the shielding section 36 can deflect the toilet wastewater attempting to flow into the hand-washing side drainage path 34 to reduce its force, thereby reducing the risk of toilet wastewater backflowing into the hand-washing side drainage path 34.

[0065] Furthermore, when the hand-washing side drainage path 34 from the hand-washing basin 30 is not connected to the hand-washing side drainage path connection part 6, the sealing part 10 remains connected to the hand-washing side drainage path connection part 6, but there is a slight possibility that the wind pressure when the toilet drain flows will cause the sealing part 10 to break. The shielding part 36 also plays a role in preventing this wind pressure from being transmitted to the sealing part, and prevents the sealing part 10 from detaching from the hand-washing side drainage path connection part 6 at an unexpected time.

[0066] Next, a flush toilet drainage unit 16 in which the drain port 8 is configured on the rear side will be described as embodiment 2. Figures 4A and 4B are views showing the flush toilet drainage unit 16 of embodiment 2. More specifically, Figure 4A is a side cross-sectional view of the flush toilet drainage unit 16, and Figure 4B is a view of the flush toilet drainage unit 16 as seen from the rear.

[0067] The second embodiment differs from the first embodiment in the location of the drain outlet 8 and the orientation of the opening of the drain outlet 8. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals and detailed description is omitted, and only components that differ from the first embodiment will be described in detail.

[0068] The flush toilet drainage unit 16 has a shielding portion 36 at the hand-washing-side drainage path connection portion 6, similar to the flush toilet drainage unit 1. When the sealing portion 10 is detached from the hand-washing-side drainage path connection portion 6, the shielding portion 36 is inserted into the hand-washing-side drainage path connection portion 6 to cover the outlet 34a of the hand-washing-side drainage path 34 connected to the hand-washing-side drainage path connection portion 6. Furthermore, the flush toilet drainage unit 16 is provided with a detour path portion 37 that runs from the outlet 34a of the hand-washing-side drainage path 34 around the shielding portion 36 and communicates with the trap portion storage portion 3.

[0069] In detail, a step 38 recessed rearward is provided on the rear wall 3a of the trap section storage section 3, and outlet 34a of hand-washing-side drainage path 34 is located in the upper region of the rear surface of this step 38, and a hanging wall 39 is suspended from the upper edge of step 38 on the rear wall 3a to position outlet 34a of hand-washing-side drainage path 34, thereby forming shielding section 36. The gap between hanging wall section underside 39a, which is the underside of hanging wall section 39, and step section underside 38a, which is the cross section of the step, forms detour path section 37, and hand-washing drainage passes through detour path section 37 and flows into drainage junction 9.

[0070] Furthermore, by providing the bypass path section 37, a path for the hand washing wastewater to flow into the wastewater junction section 9 can be secured.

[0071] The embodiment shown in FIG. 1 may also be provided with a detour path section 37 similar to that shown in FIG.

[0072] In this case, in order to allow the toilet drainage from the trap section 4 to flow as smoothly as possible into the drain outlet 8, the downstream opening 4b of the trap section 4 and the drain outlet 8 are set to be positioned approximately at the same position in the left-right direction, but the position of the hand washing side drainage path connection section 6 is set to be shifted left-right from the positions of the downstream opening 4b of the trap section 4 and the drain outlet 8.

[0073] In other words, the central axis C1 of the hand-washing-side drainage path connector 6 and the central axis C2 of the drain outlet 8 are set at positions that are offset from each other in the left-right direction. Furthermore, the hand-washing-side drainage path connector 6 is positioned slightly above and to the left of the drain outlet 8 when viewed from the direction of the trap unit 4.

[0074] When flushing the toilet, a small amount of toilet wastewater may splash out rearward from the downstream opening 4b of the trap portion 4 while it is rotating downward. By positioning the drain outlet 8 at approximately the same position in the left-right direction as the downstream opening 4b of the trap portion 4, the toilet wastewater that splashes out is discharged smoothly from the drain outlet 8 without hindrance, reducing the risk of waste and the like adhering to the toilet-side drainage path 35.

[0075] On the other hand, as described above, the position of the hand-washing side drainage path connection part 6 is set at a position shifted left and right compared to the positions of the downstream opening 4b of the trap part 4 and the drain outlet 8, thereby reducing the risk of toilet drainage water that flies out from the downstream opening 4b of the trap part 4 while rotating being directly caught on the hand-washing side drainage path connection part 6.

[0076] In other words, this also makes it possible to reduce the risk of toilet-side drainage water backflowing into the hand-washing-side drainage path 34.

[0077] Furthermore, although the drainage structure and flush toilet drainage unit 1 used in movable trap toilets have been described in detail above, the drainage structure may be used in toilets other than movable trap toilets. The flush toilet drainage unit 1 may be a flush toilet drainage unit used in a siphon toilet, for example, as shown in Figure 4. Furthermore, the flush toilet drainage unit 1 may be a siphon jet type or a siphon vortex type.

[0078] In the third embodiment of the present disclosure, a drain socket 20 will be described.

[0079] FIG. 5 is a schematic diagram of the drain socket 20. The drain socket 20 is provided with a hand-washing-side drainage path connection 22, a toilet-side drainage path connection 21, and a drain outlet 23. The drain socket 20 connects to the flush toilet drainage unit 1 or the flush toilet drainage unit 16. The toilet has a trap unit, such as a siphon jet type, siphon vortex type, or movable trap type, to prevent the intrusion of odors from the sewer pipe and to flush flush water into the bowl all at once. In the above-described embodiments, the flush toilet drainage unit 1 and the flush toilet drainage unit 16 were described, in which the trap unit and the hand-washing-side drainage path connection 6 were integrated. In embodiment 3, a flush toilet drainage unit having a trap unit (not shown) and the drain socket 20 will be described.

[0080] As shown in Figure 6, the hand-washing side drainage path 34 extending from the hand-washing basin 30 can be connected to the hand-washing side drainage path connector 22 of the drain socket 20. The toilet side drainage path connector 21 is connected to the toilet side drainage path (not shown) extending from the trap portion.

[0081] The toilet side drainage path connecting portion 21 may be connected to the toilet side drainage path extending from the trap portion, or a short connecting pipe or the like may be provided between the toilet side drainage path connecting portions 21.

[0082] The hand-washing wastewater that flows into the hand-washing-side wastewater inlet 27 and the toilet wastewater that flows into the toilet-side wastewater inlet 26 join together at the wastewater junction 24. The joined water passes through the drain outlet 23 and is discharged into a drainage path (not shown).

[0083] The internal configuration of the drain socket 20 is not limited to that shown in the drawing. In the embodiment, the inside of the drain socket 20 is formed with a toilet-side drain inlet 26 and a hand-washing-side drain inlet 27, which then join together.

[0084] However, it is not necessary to provide the toilet side drain inlet 26 and the hand washing side drain inlet 27, and the inside of the drain socket 20 may be a single integrated space.

[0085] The toilet-side drainage path connection part 21 opens upward, and the hand-washing-side drainage path connection part 22 opens to the side. This configuration makes it easier for the toilet-side drainage to flow, but the toilet-side drainage path connection part 21 and the hand-washing-side drainage path connection part 22 do not have to open in the directions described above. For example, the toilet-side drainage path connection part 21 may open to the side, and the hand-washing-side drainage path connection part 22 may open upward.

[0086] A seal 25 is provided inside the hand-washing-side drainage path connection 22, and the seal 25 is connected to the inner periphery 22a of the hand-washing-side drainage path connection 22. By providing the seal 25, when the hand-washing-side drainage path 34 is not connected to the hand-washing-side drainage path connection 22, such as when there is no hand wash basin 30 inside the toilet room 100, the seal 25 separates the inside of the drain socket 20 from the outside of the drain socket 20, making it possible to prevent odors from the toilet-side drainage from leaking to the outside through the hand-washing-side drainage path connection 22. In this way, in the drain socket 20, which constitutes part of the flush toilet drainage unit, the seal 25 and the hand-washing-side drainage path connection 22 are integrally molded.

[0087] The configuration of the sealing portion 25 is the same as that of the movable trap type flush toilet drainage unit 1, and will not be described here.

[0088] The flush toilet drainage unit (1) according to the first aspect comprises a toilet-side drainage path connection part (21), a hand-washing side drainage path connection part (22), a drainage merging part (9), and a sealing part (10). The toilet-side drainage path connection part (21) is connectable to a toilet-side drainage path (35) through which toilet drainage from the toilet bowl flows. The hand-washing side drainage path connection part (22) is connectable to a hand-washing side drainage path (34) through which hand-washing drainage from a hand-washing basin (30) flows. The drainage merging part (9) merges the toilet drainage and hand-washing drainage. The sealing part (10) separates the inside and outside of the hand-washing side drainage path connection part (22). The sealing part (10) and the hand-washing side drainage path connection part (22) are integrally molded.

[0089] The second aspect is realized by combining the first aspect with the sealing part (10). In the second aspect, the connecting part (14) of the sealing part (10) with the hand-washing-side drainage path connecting part (22) is formed with a thin wall.

[0090] The third aspect is realized by combining the first or second aspect. In the third aspect, the hand-washing side drainage path connection part (22) is cylindrical, and the sealing part (10) is provided inside the cylinder of the hand-washing side drainage path connection part (22), and has a knob part (11) that protrudes from the sealing part (10) toward the outside of the hand-washing side drainage path connection part (22).

[0091] The fourth aspect is realized by combining the third aspect with the fourth aspect. In the fourth aspect, the knob portion (11) has a height that allows it to be accommodated inside the cylinder of the hand-washing side drainage path connecting portion (22).

[0092] The fifth aspect is realized by combining with the second aspect. In the fifth aspect, the thickness of the connecting portion (14) of the sealing portion (10) with the hand-washing-side drainage path connecting portion (22) is 0.1 mm to 0.4 mm.

[0093] The sixth aspect is realized by combining the third aspect with the sixth aspect. In the sixth aspect, the knob portion (11) is triangular in shape in the outer circumferential direction.

[0094] The seventh aspect is realized by combining with the first aspect. In the seventh aspect, the sealing portion (10) has a recessed portion (13) formed with a thin wall.

[0095] The eighth aspect is realized by combining the first aspect. In the eighth aspect, a shielding portion (36) that covers the outlet of the hand-washing-side drainage path (34) exists, and the water flows from the outlet of the hand-washing-side drainage path (34) around the shielding portion and into the drainage junction (9).

[0096] DESCRIPTION OF SYMBOLS 1, 16 Flush toilet drainage unit 1a Bottom surface portion 2 Case body 3 Trap portion storage portion 3a Rear wall 4 Trap portion 4a Upstream opening 4b Downstream opening 4c Free end 4d Drive device 5 Through hole 6, 22 Hand-washing side drainage path connection portion 6a, 22a Inner circumference portion 7, 21 Toilet-side drainage path connection portion 8, 23 Drain outlet 9, 24 Drainage merging portion 10, 25 Sealing portion 11 Knob portion 12 Thin-walled portion 13 Recessed portion 14 Connection portion 20 Drainage socket 26 Toilet-side drainage inlet portion 27 Hand-washing side drainage inlet portion 30 Hand wash basin 31 Toilet body 34 Hand-washing side drainage path 34a Outlet 35 Toilet-side drainage path 36 Shielding portion 37 Bypass path portion 38 Step 38a Step underside 39 Hanging wall 39a Hanging wall underside 51 Cap 52 Gasket 100 Toilet room C1, C2 Central axis

Claims

1. A flush toilet drainage unit comprising: a toilet side drainage path connection part connectable to a toilet side drainage path through which toilet drainage from the toilet bowl flows; a hand wash side drainage path connection part connectable to a hand wash side drainage path through which hand wash drainage from a hand wash basin flows; a drainage junction part where the toilet drainage and the hand wash drainage join together; and a sealing part separating the inside and outside of the hand wash side drainage path connection part, wherein the sealing part and the hand wash side drainage path connection part are integrally molded.

2. A flush toilet drainage unit as described in claim 1, wherein the connecting portion of the sealing portion with the hand-washing side drainage path connecting portion is formed with a thin wall.

3. A flush toilet drainage unit as described in claim 1 or 2, wherein the hand-washing side drainage path connection portion is cylindrical, the sealing portion is provided within the tube of the hand-washing side drainage path connection portion, and has a knob portion that protrudes from the sealing portion toward the outside of the hand-washing side drainage path connection portion.

4. A flush toilet drainage unit according to claim 3, wherein the knob portion is of a height that fits within the tube of the hand-washing side drainage path connection portion.

5. A flush toilet drainage unit according to claim 2, wherein the thickness of the connecting portion of the sealing portion with the hand-washing side drainage path connecting portion is 0.1 mm to 0.4 mm.

6. A flush toilet drain unit according to claim 3, wherein the knob portion is triangular in shape in the outer circumferential direction.

7. A flush toilet drainage unit according to claim 1, wherein the sealing portion has a thin-walled molded recessed portion.

8. A flush toilet drainage unit as described in claim 1, wherein the outlet of the hand-washing side drainage path has a shielding portion that covers the outlet, and water flows from the outlet of the hand-washing side drainage path around the shielding portion and into the drainage junction.

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