Bathroom drainage unit

Abstract

To provide a drainage unit for a bathroom capable of maintaining good drainage performance. [Solution] A bathroom drainage unit comprising a first flow path connecting the drain outlet on the washing area floor to the drain pipe connection hole, and a second flow path connecting the drain outlet on the bathtub side to the drain pipe connection hole, the bathroom drainage unit having a connecting flow path connecting the first flow path and the second flow path, the first flow path having a first drainage passage range downstream of the connecting flow path with the smallest flow volume, the second flow path having a second drainage passage range downstream of the connecting flow path with the smallest flow volume, the flow volume of the first drainage passage range being larger than that of a third drainage passage range with the smallest flow volume among the connecting flow paths, and the flow volume of the second drainage passage range being larger than that of the third drainage passage range.

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Aspects of the present invention generally relate to bathroom drainage units. [Background technology]

[0002] A drainage unit for draining water from the floor of a washing area and the bathtub is known. This drainage unit is equipped with a check valve unit that prevents the water from flowing from the floor of the washing area into the bathtub (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2018-48490 A Summary of the Invention [Problem to be solved by the invention]

[0004] In such a bathroom drainage unit, there is a risk that the drainage performance will be impaired due to dirt adhering to the check valve unit.

[0005] The present invention was made based on the recognition of such problems, and aims to provide a bathroom drainage unit that can maintain good drainage performance. [Means for solving the problem]

[0006] The first invention is a bathroom drainage unit having a first flow path connecting a drain outlet on the washing area floor to a drain pipe connection hole, and a second flow path connecting a drain outlet on the bathtub side to a drain pipe connection hole, wherein the bathroom drainage unit has a connecting flow path connecting the first flow path and the second flow path, wherein the first flow path has a first drainage passage range downstream of the connecting flow path with the smallest flow area, and the second flow path has a second drainage passage range downstream of the connecting flow path with the smallest flow area, and the flow area of ​​the first drainage passage range is larger than that of a third drainage passage range with the smallest flow area among the connecting flow paths, and the flow area of ​​the second drainage passage range is larger than that of the third drainage passage range.

[0007] With this bathroom drainage unit, backflow from the drainage on the floor of the washing area into the bathtub can be suppressed, for example, without the need for a check valve, and water seal failure can be suppressed while maintaining good drainage performance.

[0008] The second invention is a bathroom drainage unit configured in the first invention so that the portion of the connecting flow path cross section that is upstream of an arbitrary position in the second flow path where the second flow path connects to the connecting flow path is smaller than any downstream flow path cross section that is downstream of the arbitrary position in the second flow path.

[0009] This bathroom drainage unit can prevent drainage water from the bathtub side from flowing back onto the floor of the washing area.

[0010] The third invention is a bathroom drainage unit according to the first invention, which has a cylindrical water seal cylinder installed at the drain outlet of the washing area floor, and the first drainage passage range and the third drainage passage range are installed below the water seal cylinder.

[0011] With this bathroom drainage unit, the first drainage passage range and the third drainage passage range are located below the water seal cylinder, which further reduces the possibility of drainage from the washing area floor flowing back into the bathtub, and also stabilizes the flow of drainage while preventing the water seal from breaking.

[0012] A fourth invention is the drainage unit for a bathroom according to the first invention, wherein an upper end of the connection flow path is located lower than an upper end of the first drainage passage range.

[0013] This bathroom drainage unit allows wastewater to flow more easily toward the first flow path, preventing backflow of wastewater from the drain on the washing area floor into the bathtub while also preventing seal failure.

[0014] A fifth invention is the drainage unit for a bathroom according to the fourth invention, wherein a lower end of the connecting flow path is flush with a bottom of the second flow path.

[0015] This bathroom drainage unit allows wastewater to flow more easily toward the first flow path, preventing backflow of wastewater from the drain on the washing area floor into the bathtub while also preventing seal failure.

[0016] A sixth aspect of the present invention is the drainage unit for a bathroom according to the first aspect of the present invention, wherein the first flow path and the second flow path are connected to the same drain pipe connection hole.

[0017] This bathroom drainage unit allows the first flow path and the second flow path to be connected to a single drain pipe while preventing backflow of drainage from the drain on the floor of the washing area into the bathtub.

[0018] The seventh invention is a bathroom drainage unit according to the sixth invention, wherein the first flow path has a first rising section that rises as it moves downstream on the bottom surface, and a first water seal regulating section that is connected to the downstream side of the rising section and regulates the water seal height within the 21st flow path; the second flow path has a second rising section that rises as it moves downstream on the bottom surface, and a second water seal regulating section that is connected to the downstream side of the rising section and regulates the water seal height within the second flow path; and the first flow path and the second flow path are connected downstream of the first water seal regulating section and the second water seal regulating section.

[0019] According to this bathroom drainage unit, the first flow path and the second flow path are connected downstream of the first water seal regulating section and the second water seal regulating section, so that the first flow path and the second flow path can be connected to a single drainage pipe while further reducing the possibility of the drainage water flowing back upstream of the first water seal regulating section and the second water seal regulating section.

[0020] The eighth invention is a bathroom drainage unit according to the seventh invention, wherein the first flow path further has a first descending section downstream of the first water seal stipulating section, which descends on the bottom surface as it moves downstream, and the second flow path further has a second descending section downstream of the second water seal stipulating section, which descends on the bottom surface as it moves downstream, and the first flow path and the second flow path are connected at the first descending section and the second descending section, or downstream of the first descending section and the second descending section.

[0021] According to this bathroom drainage unit, the first flow path and the second flow path are connected at the first descending section and the second descending section, or downstream of the first descending section and the second descending section, so that the first flow path and the second flow path can be connected to a single drainage pipe while further reducing the possibility of drainage water flowing back upstream of the first water seal regulating section and the second water seal regulating section. [Effects of the Invention]

[0022] According to an aspect of the present invention, a bathroom drainage unit that can maintain good drainage performance can be provided. [Brief explanation of the drawings]

[0023] [Figure 1] FIG. 1 is a perspective view showing a bathroom equipped with a bathroom drainage unit according to an embodiment. [Figure 2] This is a plan view of the bathroom drainage unit from above. [Figure 3] FIG. 4 is a plan view showing a first flow path and a second flow path of the drainage unit. [Figure 4] 3 is a cross-sectional view of the drainage unit as seen from the direction of arrow AA in FIG. 2. [Figure 5] 3 is a cross-sectional perspective view of the drainage unit as seen from the direction of arrow BB in FIG. 2. [Figure 6] 3 is a cross-sectional perspective view of the drainage unit as seen from the direction of arrow CC in FIG. 2. FIG. [Figure 7] 7 is a cross-sectional view of the drainage unit as seen from the direction of arrow DD in FIG. 6. [Figure 8] FIG. 2 is a perspective view showing the water seal cylinder alone. [Figure 9] A cross-sectional view showing a bathroom drainage unit according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0024] Hereinafter, embodiments will be described with reference to the drawings. In the drawings, like components are designated by like reference numerals, and detailed descriptions thereof will be omitted where appropriate. FIG. 1 is a perspective view showing a bathroom equipped with a bathroom drainage unit according to an embodiment. As shown in FIG. 1, bathroom 1 includes a washing area floor 10, a bathtub 90, and wall panels 96a to 96f.

[0025] A washing area floor 10 is installed in the space next to the bathtub 90. The surface 10a of the washing area floor 10 is waterproof so that water does not leak outside the bathroom. Note that in this specification, the term "water" includes not only cold water but also heated hot water. Also, in this specification, the terms "upstream side" and "downstream side" are based on the direction in which wastewater flows.

[0026] A drain pipe 92 is provided on the back side (lower side) of the washing area floor 10 to drain the drainage water on the washing area floor 10 side and the drainage water on the bathtub 90 side. In the washing area floor 10, for example near the boundary with the bathtub 90, a drain outlet 10h is formed to drain the drainage water on the washing area floor 10 side to the drain pipe 92. The drain outlet 10h is covered by a lid (not shown). The drain outlet 10h is recessed downward and is connected to the drain pipe 92 via a drainage unit 20 (described later). In addition, a drain outlet 90a provided at the bottom of the bathtub 90 is also connected to the drainage pipe 92 via the drainage unit 20.

[0027] A bath apron 94 is provided at the boundary between the bathtub 90 and the washing area floor 10, covering the side of the bathtub 90 facing the washing area floor 10. Depending on the structure of the bathtub 90, the bath apron 94 may not be provided.

[0028] As shown by the two-dot chain line in Figure 1, wall panels 96a-96c are installed on the rim of bathtub 90. Wall panels 96d-96f are installed on the peripheral edge of washing area floor 10. A door is attached to wall panel 96f via a door mounting frame (not shown).

[0029] Next, the bathroom drainage unit 20 will be described with reference to FIGS. FIG. 2 is a plan view of the bathroom drainage unit seen from above. FIG. 3 is a plan view showing the first flow path and the second flow path of the drainage unit. 4 is a cross-sectional view of the drainage unit as seen from the direction of arrow AA in FIG. 5 is a cross-sectional perspective view of the drainage unit as seen from the direction of arrow BB in FIG. 2. FIG. 6 is a cross-sectional perspective view of the drainage unit as seen from the direction of arrow CC in FIG. 2. FIG. 7 is a cross-sectional view of the drainage unit as seen from the direction of arrow DD in FIG. FIG. 8 is a perspective view showing the water seal cylinder alone.

[0030] The bathroom drainage unit 20 (hereinafter referred to as drainage unit 20) is the part that connects the washing area floor 10 to a drain pipe 92 and the bathtub 90 to the drain pipe 92. That is, water on the washing area floor 10 side flows through the drainage unit 20 from a drain outlet 10h and is led to the drain pipe 92. Water on the bathtub 90 side flows through the drainage unit 20 from a drain outlet 90a and is led to the drain pipe 92. The drainage unit 20 also stores sealing water inside, thereby preventing odors and pests from entering the washing area floor 10 and the bathtub 90 from the drain pipe 92. The drainage unit 20 is equipped with a washing area-side drain section 30, a bathtub-side drain section 50, and an intermediate drain section 60.

[0031] The washing area side drain section 30 consists of a cylindrical water sealing cylinder 31, which extends downward from the drain outlet 10h of the washing area floor 10. The water sealing cylinder 31 is not limited to a cylindrical shape, and may be a prismatic cylinder. The inside of the water sealing cylinder 31 is a washing area side drain hole 32 through which the wastewater flowing from the drain outlet 10h of the washing area floor 10 flows. The washing area side drain hole 32 is connected to the drain outlet 10h on the upstream side in the direction in which the wastewater flows.

[0032] The upper end 31a of the water sealing cylinder 31 is located at the bottom of the drain outlet 10h and opens into the drain outlet 10h. A hair catcher 40 is attached to the upper end 31a of the water sealing cylinder 31 to catch foreign matter such as hair contained in the drainage water.

[0033] The water seal cylinder 31 can be removed from the drain outlet 10h by pulling it upward. When the water seal cylinder 31 is attached, the lower end 31b of the water seal cylinder 31 is positioned at a predetermined distance from the bottom 64c of the intermediate drain section 60. This predetermined distance defines a first drainage passage range 83a and a third drainage passage range 85a, which will be described later.

[0034] The water seal cylinder 31 has a positioning protrusion 35 for forming the first drainage passage range 83a of the first flow path 83 and the third drainage passage range 85a of the connecting flow path 85 at fixed positions. The positioning protrusion 35 protrudes radially outward from the outer surface portion 31c of the water seal cylinder 31. The water seal cylinder 31 can be attached to the intermediate drainage section 60 by aligning the positioning protrusion 35 with the recess in the intermediate drainage section 60.

[0035] The water seal cylinder 31 has an engaging portion 36 that engages with the intermediate drainage section 60. The engaging portion 36 is an elastic claw portion that is provided on the outer surface portion 31c of the water seal cylinder 31. For example, multiple engaging portions 36 are provided spaced apart in the circumferential direction of the outer surface portion 31c. The water seal cylinder 31 is configured to be attached to the intermediate drainage section 60 by engaging the engaging portions 36 with the engaged portions 72 of the intermediate drainage section 60.

[0036] The water seal cylinder 31 has a seal mounting portion 37 for mounting a seal member 38. The seal mounting portion 37 is provided on the outer surface portion 31c of the water seal cylinder 31 so as to extend circumferentially. The seal member 38 is provided between the water seal cylinder 31 and the intermediate drainage portion 60. The seal member 38 prevents the drainage water flowing through the first flow path 83 and the second flow path 84 (described below) from leaking toward the drain outlet 10h. As a result, the outer surface portion 31c of the water seal cylinder 31 does not come into contact with the drainage water above the seal member 38. Therefore, the outer surface portion 31c of the water seal cylinder 31 can prevent dirt from adhering above the seal member 38.

[0037] The bathtub-side drain section 50 is located below the bathtub 90. Inside the bathtub-side drain section 50 is a bathtub-side drain hole 51 through which the wastewater flowing from the drain outlet 90a of the bathtub 90 flows. The bathtub-side drain hole 51 is connected to the drain outlet 90a of the bathtub 90 on the upstream side in the direction of the wastewater flow, and is connected to the intermediate drain section 60, which will be described later, on the downstream side.

[0038] The intermediate drain section 60 is located below the washing area floor 10. The intermediate drain section 60 is located between the washing area-side drain section 30 and the bathtub-side drain section 50 and the drain pipe 92. That is, the upstream side of the intermediate drain section 60 is connected to the bathtub-side drain section 50, and the downstream side is connected to the drain pipe 92. The washing area-side drain section 30 (water seal cylinder 31) is also connected to the upper part of the intermediate drain section 60. The intermediate drain section 60 has a first flow path 83, a second flow path 84, and a connecting flow path 85 formed inside it. The intermediate drain section 60 has a box-shaped main body section 61 that is open at the top, and a lid section 70 that covers the top of the main body section 61.

[0039] The main body 61 has a bathtub side connection 62 that is connected to the bathtub side drain 50, and a flow path 64 that is connected to the bathtub side connection 62. The flow path 64 has a guide wall 65 that protrudes from one side wall surface 64a toward the other side wall surface 64b. The guide wall 65 is located on the bathtub side connection 62 side. The guide wall 65 blocks the drainage water that flows out from the bathtub side connection 62 into the flow path 64 from flowing toward the first flow path 83.

[0040] The flow path section 64 has an insertion section 67 below the drain outlet 10h of the washing area floor 10, through which the water seal cylinder 31 is inserted. The insertion section 67 is located upstream of the guide wall section 65. When the water seal cylinder 31 is inserted into the insertion section 67, the flow path section 64 is formed with a first flow path 83 that guides drainage water W1 on the washing area floor 10 side to the drain pipe 92, and a second flow path 84 that guides drainage water W2 on the bathtub 90 side to the drain pipe 92. The flow path section 64 also has a connecting flow path 85 that connects the first flow path 83 and the second flow path 84. When the water seal cylinder 31 is inserted into the insertion section 67, the flow path section 64 is formed with a first drainage passage range 83a of the first flow path 83 and a third drainage passage range 85a of the connecting flow path 85 below the water seal cylinder 31.

[0041] The bottom 64c of the flow path section 64 has a flat section 64c1 located on the upstream side and an inclined section 64c2 that slopes obliquely upward from the flat section 64c1. The inclined section 64c2 is located downstream of the insertion section 67. The inclined section 64c2 has a first rising section 83b and a second rising section 84d. The first rising section 83b is located in the first flow path 83. The second rising section 84d is located in the second flow path 84. The flow path section 64 is configured to form a water sealing surface W1a in the first flow path 83 and a water sealing surface W2a in the second flow path 84 due to the height difference between the flat section 64c1 and the inclined section 64c2.

[0042] The flow path section 64 has a partition wall 69 extending upward from the bottom 64c. The partition wall 69 is located downstream of the water seal cylinder 31 and stands upright in the center of the flow path section 64 in the width direction. The partition wall 69 stands upright upward from the inclined section 64c2. The partition wall 69 divides the interior of the flow path section 64 into a first flow path 83 and a second flow path 84. The first flow path 83 is defined between one side wall surface 64a and the partition wall 69. The second flow path 84 is defined between the other side wall surface 64b and the partition wall 69.

[0043] The lid portion 70 covers the upper part of the main body portion 61. The lid portion 70 has an attachment portion 71 for attaching the water seal cylinder 31 at a position corresponding to the insertion portion 67 of the flow path portion 64, and a drain pipe connection portion 73 to which the drain pipe 92 is connected. The lower end of the attachment portion 71 is provided with an engaged portion 72 that engages with the engaging portion 36 of the water seal cylinder 31, and a recess (not shown) through which the positioning protrusion 35 of the water seal cylinder 31 is inserted. The drain pipe connection portion 73 has a drain pipe connection hole 73a inside, and is located on the downstream side of the lid portion 70.

[0044] Next, we will explain the first flow path 83, the second flow path 84, the first drainage passage range 83a of the first flow path 83, the second drainage passage range 84c of the second flow path 84, and the third drainage passage range 85a of the connecting flow path 85, which are formed within the intermediate drainage section 60.

[0045] The first flow path 83 connects the drain outlet 10h of the washing area floor 10 and the drain pipe connecting hole 73a. The first flow path 83 has a first drain passing range 83a where the flow area is smallest downstream of the connecting flow path 85. The second flow path 84 connects the drain outlet 90a on the bathtub 90 side and the drain pipe connecting hole 73a. The second flow path 84 has a second drain passing range 84c where the flow area is smallest downstream of the connecting flow path 85. The connecting flow path 85 connects the first flow path 83 and the second flow path 84. The connecting flow path 85 has a third drain passing range 85a where the flow area is smallest between the first flow path 83 and the second flow path 84.

[0046] The first drainage water passing range 83a is set by the position of the connecting flow path 85. Specifically, the first drainage water passing range 83a is set at a position in the first flow path 83 downstream of the connecting flow path 85 where the flow area is smallest.

[0047] In this example, the first drainage water passing range 83a and the third drainage water passing range 85a are provided below the water seal cylinder 31. That is, the first drainage water passing range 83a and the third drainage water passing range 85a are formed between the lower end portion 31b of the water seal cylinder 31 and the flat portion 64c1 of the bottom portion 64c of the flow path portion 64. In this example, the first drainage water passing range 83a and the third drainage water passing range 85a are connected in the circumferential direction. As shown in FIG. 3, the first drainage water passing range 83a and the third drainage water passing range 85a have a relationship such that the drainage water W1 in the washing area-side drain hole 32 flows preferentially into the first drainage water passing range 83a.

[0048] The upper end 85a1 of the third drainage passing range 85a is located lower than the upper end 83a1 of the first drainage passing range 83a. The upper end 83a1 of the first drainage passing range 83 and the upper end 85a1 of the third drainage passing range 85a form the lower end 31b of the water seal cylinder 31. In other words, the lower end 31b of the water seal cylinder 31 is formed in a stepped shape in the vertical direction.

[0049] On the other hand, the lower end of the first drainage water passing range 83a and the lower end of the third drainage water passing range 85a are on the flat portion 64c1 of the bottom 64c of the flow path portion 64. In other words, the lower end of the first drainage water passing range 83a and the lower end of the third drainage water passing range 85a are on the same plane as the bottom 64c of the first flow path portion 83 and the bottom 64c of the second flow path portion 84.

[0050] As shown in Figure 4, the height dimension H1 from the flat portion 64c1 of the bottom 64c of the flow path portion 64 to the upper end 85a1 of the third drainage passing range 85a is smaller than the height dimension H2 from the flat portion 64c1 to the upper end 85a1 of the first drainage passing range 83a.

[0051] As shown by the dotted areas in Figures 5 and 6, the flow area S1 of the first drainage water passing range 83a is larger than the flow area S2 of the third drainage water passing range 85a. The flow areas S1 and S2 are the cross-sectional areas of the flow path through which the drainage water flows between the upstream and downstream ends of the first flow path 83 and the connecting flow path 85. In this example, the flow area S1 can be calculated by multiplying the arc length of the first drainage water passing range 83a by the height. The flow area S2 can be calculated by multiplying the arc length of the third drainage water passing range 85a by the height.

[0052] As a result, the wastewater W1 in the washing area-side drain hole 32 flows more easily toward the first drainage passage range 83a than toward the third drainage passage range 85a. Therefore, even without using a check valve or the like between the washing area-side drain hole 32 and the drain outlet 90a of the bathtub 90, the wastewater W1 on the washing area floor 10 side is prevented from flowing back from the connecting flow path 85 toward the bathtub 90 side via the second flow path 84.

[0053] The first flow path 83 connects the drain outlet 10h of the washing area floor 10 and the drain pipe connection hole 73a. The wastewater W1 flowing out from the first drainage passing range 83a flows from the first flow path 83 toward the drain pipe 92.

[0054] The first flow path 83 has a first rising portion 83b that rises toward downstream on the bottom surface, and a first water seal regulating portion 83b1 that is connected to the downstream side of the first rising portion 83b and regulates the water seal height within the first flow path 83. The first flow path 83 also has a first falling portion 83c that falls toward downstream on the bottom surface, downstream of the first water seal regulating portion 83b1. As shown in Figure 5, when the flow of wastewater W1 stops, the seal water accumulates, and a water seal surface W1a is formed at the first water seal regulating portion 83b1 (upper end) of the first rising portion 83b.

[0055] The second flow path 84 connects the drain outlet 90a on the bathtub 90 side and the drain pipe connection hole 73a. Drain water W2 on the bathtub 90 side flows through the second flow path 84. Here, a seal member 38 is provided between the water seal cylinder 31 and the mounting portion 71 of the lid portion 70. As a result, the drain water W2 flowing through the second flow path 84 does not stagnate above the seal member 38. Therefore, the outer surface portion 31c of the water seal cylinder 31 is prevented from becoming dirty above the seal member 38.

[0056] Furthermore, the wastewater W2 flows smoothly toward the drain pipe connection hole 73a on the outer surface 31c of the water seal cylinder 31 below the sealing member 38. As a result, the wastewater W2 flows through the second flow path 84 along the outer surface 31c of the water seal cylinder 31, preventing dirt from adhering to the outer surface 31c.

[0057] In addition, the second flow path 84 is connected to the same drain pipe connection hole 73a as the first flow path 83. This allows the drainage unit 20 to drain the drainage W1 on the washing area floor side and the drainage W2 on the bathtub side into a single drainage pipe 92.

[0058] The second flow path 84 has a first portion 84a located between the bathtub-side drain hole 51 and a third drainage passage range 85a, and a second portion 84b located between the first portion 84a and the drain pipe connection hole 73a. That is, the connection flow path 85 is connected to the second portion 84b of the second flow path 84. The second portion 84b has a second drainage passage range 84c.

[0059] The second drainage water passing range 84c is set by the position of the connecting flow path 85. Specifically, the second drainage water passing range 84c is set at a position in the second flow path 84 where the flow area is smallest downstream of the connecting flow path 85. As shown in Figures 6 and 7 , by making the flow area S3 of the second drainage water passing range 84c of the second flow path 84 larger than the flow area S2 of the third drainage water passing range 85a of the connecting flow path 85, the flow of drainage water from the second flow path 84 toward the connecting flow path 85 is suppressed.

[0060] 6 and 7, the position of the second drainage water passing range 84c is the portion with the smallest flow area downstream of the downstream end position 85b of the connecting flow path surface where the connecting flow path 85 is connected to the second flow path 84. The flow area S3 of this second drainage water passing range 84c is larger than the flow area S2 of the third drainage water passing range 85a of the connecting flow path 85 located upstream of the second drainage water passing range 84c.

[0061] The third drainage passing range 85a of the connecting flow path 85 extends from the guide wall portion 65 to the partition wall 69. Therefore, the second drainage passing range 84c is set at a position where the flow area is smallest downstream of the space between the partition wall 69 and the water seal cylinder 31 (downstream end position 85b). The flow area S3 of the second drainage passing range 84c at this position is larger than the flow area S2 of the third drainage passing range 85a of the connecting flow path 85.

[0062] Drainage unit 20 prevents drainage water W2 flowing through second flow path 84 from flowing into third drainage passing range 85a by making flow area S3 of second drainage passing range 84c of second flow path 84 larger than flow area S2 of third drainage passing range 85a. This allows drainage unit 20 to prevent drainage water W2 on the bathtub 90 side from flowing through third drainage passing range 85a to the washing area floor 10 side from washing area-side drain hole 32.

[0063] Furthermore, as shown in Figures 4, 6, and 7, the flow area S21 of the connecting flow path cross section 86 located upstream of any position 85c in the second flow path 84 where the second flow path 84 connects to the connecting flow path 85 is smaller than the flow area S31 of any downstream flow path cross section 84c1 located downstream of the any position 85c in the second flow path 84.

[0064] 4 and 7, the flow area S31 of downstream flow path cross section 84c1 is smaller than the flow area S3 of second drainage passage range 84c. In this example, downstream flow path cross section 84c1 is the portion of second flow path 84 with the smallest flow area. This downstream flow path cross section 84c1 with the smallest flow area is larger than the flow area S21 of connecting flow path cross section 86 located upstream of downstream flow path cross section 84c1. This prevents drainage water W2 from the bathtub 90 side from entering the washing area floor 10 side and flowing back.

[0065] Drainage water W2 on the bathtub 90 side flows from the second flow path 84 toward the drain pipe 92. The second flow path 84 has a second ascending section 84d that rises toward the downstream side on the bottom surface, and a second water seal defining section 84d1 that is connected downstream of the second ascending section 84d and defines the water seal height within the second flow path 84. The second flow path 84 also has a second descending section 84e downstream of the second water seal defining section 84d1 that descends toward the downstream side on the bottom surface. As shown in FIG. 6, when the flow of drainage water W2 stops, water seal accumulates, and a water seal surface W2a is formed at the second water seal defining section 84d1 (upper end) of the second ascending section 84d.

[0066] The first flow path 83 and the second flow path 84 are connected at the first descending portion 83c and the second descending portion 84e, or downstream of the first descending portion 83c and the second descending portion 84e. This allows the first flow path 83 and the second flow path 84 to be connected to one drain pipe 92 while further reducing the possibility that the drain water will flow back upstream of the first water seal specifying portion 83b1 and the second water seal specifying portion 84d1.

[0067] In this way, drainage unit 20 separates first flow path 83 through which drainage water W1 on the washing area floor 10 side flows, and second flow path 84 through which drainage water W2 on the bathtub 90 side flows. Drainage unit 20 is able to maintain good drainage performance without using, for example, a check valve, due to the relative sizes of flow area S1 of first drainage water passing range 83a, flow area S2 of third drainage water passing range 85a, and flow area S3 of second drainage water passing range 84c.

[0068] Next, the function of the connecting flow path 85 will be described.

[0069] The connecting flow path 85 maintains the water sealing surface W1a of the first flow path 83 and the water sealing surface W2a of the second flow path 84 at the same height. Here, for example, due to negative pressure in the drain pipe 92, the water sealing of the first flow path 83 may be pulled into the drain pipe 92, which may cause the water sealing to break.

[0070] In such a case, the seal water in the second flow path 84 flows to the first flow path 83 via the connecting flow path 85. Furthermore, if a seal water break occurs in the second flow path 84, the seal water in the first flow path 83 flows to the second flow path 84 via the connecting flow path 85. Therefore, the connecting flow path 85 makes the seal water surface W1a of the first flow path 83 and the seal water surface W2a of the second flow path 84 at the same height. As a result, even though the drainage unit 20 divides the drainage flow path into the first flow path 83 and the second flow path 84, it is possible to prevent a seal water break from occurring in the first flow path 83 and the second flow path 84.

[0071] Next, a modified example of the present invention will be described with reference to FIG. FIG. 9 is a cross-sectional view showing a drainage unit for a bathroom according to a modified example.

[0072] In the above-described embodiment, an example has been described in which the connection flow path 85 is provided below the water seal cylinder 31. However, the present invention is not limited to this. For example, as in the modified example shown in Fig. 9, the connection flow path 87 may have a first connection path 87a provided below the water seal cylinder 31, a second connection path 87b provided between the outer surface 31c of the water seal cylinder 31 and the guide wall portion 65, and a third connection path 87c provided between the outer surface 31c of the water seal cylinder 31 and the partition wall 69. The second connection path 87b and the third connection path 87c connect the first flow path 83 and the second flow path 84 outside the water seal cylinder 31. The flow area S2a of the third drainage passage range 87d of the connection flow path 85 is the sum of the flow area S2a1 of the first connection path 87a, the flow area S2a2 of the second connection path 87b, and the flow area S2a3 of the third connection path 87c.

[0073] In the modified example, the connection flow path 87 having the first to third connection paths 87a to 87c has been described as an example. However, for example, the connection flow path 87 may have at least one of the first to third connection paths 87a to 87c.

[0074] In the above-described embodiment, an example was described in which the first drainage water passing range 83a and the third drainage water passing range 85a are provided below the water seal cylinder 31. However, the present invention is not limited to this, and for example, the first drainage water passing range and the third drainage water passing range may be provided in holes formed in the outer surface portion 31c of the water seal cylinder 31.

[0075] In the above-described embodiment, the first drainage water passing range 83a and the third drainage water passing range 85a are continuous in the circumferential direction. However, the present invention is not limited to this. For example, the first drainage water passing range and the third drainage water passing range 85a may be spaced apart in the circumferential direction.

[0076] In the above-described embodiment, the first flow path 83 and the second flow path 84 are connected to the same drain pipe connecting hole 73a. However, the present invention is not limited to this, and for example, the first flow path and the second flow path may be connected to different drain pipe connecting holes.

[0077] Embodiments may include the following features. (Configuration 1) a first flow path connecting a drain outlet on the floor of the washing area and a drain pipe connection hole; a second flow path connecting the drain outlet on the bathtub side and the drain pipe connection hole; A bathroom drainage unit comprising: a connecting flow path that connects the first flow path and the second flow path, the first flow path has a first drainage passage range having the smallest flow area downstream of the connecting flow path, The second flow path has a second drainage passage range having the smallest flow area downstream of the connecting flow path, The flow area of ​​the first drainage passage range is larger than that of the third drainage passage range, which has the smallest flow area among the connecting flow paths, A bathroom drainage unit, wherein the flow area of ​​the second drainage passage range is larger than the flow area of ​​the third drainage passage range. (Configuration 2) A bathroom drainage unit as described in configuration 1, wherein the portion of the connecting flow path cross section that is upstream of any position in the second flow path where the second flow path connects to the connecting flow path is configured to be smaller than any downstream flow path cross section that is downstream of the any position in the second flow path. (Configuration 3) A cylindrical water seal cylinder is provided at the drain outlet of the washing area floor, A bathroom drainage unit as described in configuration 1 or 2, wherein the first drainage passage range and the third drainage passage range are located below the water seal cylinder. (Configuration 4) 4. The bathroom drainage unit according to any one of configurations 1 to 3, wherein the upper end of the connecting flow path is located lower than the upper end of the first drainage passage range. (Configuration 5) A bathroom drainage unit as described in configuration 4, wherein the lower end of the connecting flow path is flush with the bottom of the second flow path. (Configuration 6) 6. The bathroom drainage unit according to any one of configurations 1 to 5, wherein the first flow path and the second flow path are connected to the same drain pipe connection hole. (Configuration 7) The first flow path is a first rising portion that rises toward the downstream side at the bottom surface; A first water seal determining section connected to the downstream side of the rising section and determining the water seal height in the first flow path, The second flow path is a second rising portion that rises toward the downstream side at the bottom surface; A second water seal determining portion is connected to the downstream side of the rising portion and determines the water seal height in the second flow path, 7. The bathroom drainage unit according to claim 6, wherein the first flow path and the second flow path are connected downstream of the first water seal defining portion and the second water seal defining portion. (Configuration 8) The first flow path is Further, a first descending portion is provided downstream of the first water seal defining portion, the first descending portion descending downstream on the bottom surface, The second flow path is Further, a second descending portion is provided downstream of the second water seal defining portion, the second descending portion descending downstream on the bottom surface, A bathroom drainage unit as described in configuration 7, wherein the first flow path and the second flow path are connected at the first descending section and the second descending section, or downstream of the first descending section and the second descending section.

[0078] The above describes embodiments of the present invention. However, the present invention is not limited to these descriptions. Design modifications made by a person skilled in the art to the above-described embodiments are also within the scope of the present invention as long as they incorporate the features of the present invention. For example, the shape, dimensions, materials, and arrangement of each element of a bathroom drainage unit are not limited to those illustrated and can be modified as appropriate. Furthermore, the elements of the above-described embodiments can be combined to the extent technically possible, and such combinations are also within the scope of the present invention as long as they incorporate the features of the present invention. [Explanation of symbols]

[0079] 1 bathroom 10 Washing area floor 10a surface 10h Drain port 20 Drainage unit 30 Washing area drain 31 Water sealer 31a Upper end 31b Lower end 31c External part 32 Drainage hole on the washing area side 35 Positioning protrusion 36 Engagement part 37 Seal mounting part 38 Sealing material 40 Hair Catcher 50 Bathtub side drain 51 Bathtub side drain hole 60 Intermediate drainage section 61 Main body 62 Bathtub side connection 64 Flow path section 64a One side wall 64b Other side wall 64c bottom 64c1 Flat part 64c2 Slope 65 Guide wall 67 Insertion part 69 Bulkhead 70 Lid 71 Mounting part 72 Engaged part 73 Drain pipe connection 73a Drainage pipe connection hole 83 First Channel 83a First drainage passage area 83a1 top end 83b First Ascending Section 83b1 1st water seal regulation section 83c 1st descent section 84 Second Channel 84a Part 1 84b Part 2 84c Second drainage passage range 84c1 Downstream flow section 84d Second Ascending Section 84d1 2nd water seal regulation section 84e 2nd descending section 85 Connecting Channel 85a Third drainage passage area 85a1 top end 85b Downstream end position 85c Any position 86 Connecting channel cross section 87 Connecting Channel 87a First Connection 87b Second Connection 87c Third Connector 87d Third drainage passage range 90 Bathtub 90a drain 92 Drain pipe 94 Bus Apron 96a~96f Wall Panels S1 Flow area of ​​first drainage passage area S2 Volume of the third drainage passage area S21 Flow area of ​​the connecting channel cross section S2a Flow area of ​​the third drainage passage area S2a1 Flow area of ​​the third drainage passage area of ​​the first connecting channel S2a2 Volume of the third drainage passage area of ​​the second connecting channel S2a3 Flow area of ​​the third drainage passage area of ​​the third connecting channel S3 Volume of the second drainage passage area S31 Flow area of ​​downstream channel cross section W1 Washing area floor drain W2 Bathtub side drain W1a Sealing surface of first flow path W2a Sealing surface of second flow path

Claims

1. a first flow path connecting a drain outlet on the floor of the washing area and a drain pipe connection hole; a second flow path connecting the drain outlet on the bathtub side and the drain pipe connection hole; A bathroom drainage unit comprising: a connecting flow path that connects the first flow path and the second flow path, the first flow path has a first drainage passage range having the smallest flow area downstream of the connecting flow path, the second flow path has a second drainage passage range having the smallest flow area downstream of the connecting flow path, The flow area of ​​the first drainage passage range is larger than that of a third drainage passage range having the smallest flow area among the connecting flow paths, A bathroom drainage unit, wherein the flow area of ​​the second drainage passage range is larger than the flow area of ​​the third drainage passage range.

2. A bathroom drainage unit as described in claim 1, wherein the portion of the connecting flow path cross section that is upstream of any position in the second flow path where the second flow path connects to the connecting flow path is configured to be smaller than any downstream flow path cross section that is downstream of the any position in the second flow path.

3. A cylindrical water seal cylinder is provided at the drain outlet of the washing area floor, The bathroom drainage unit according to claim 1, wherein the first drainage passage range and the third drainage passage range are located below the water seal cylinder.

4. The bathroom drainage unit according to claim 1, wherein the upper end of the connecting flow path is located lower than the upper end of the first drainage passage range.

5. The bathroom drainage unit according to claim 4, wherein the lower end of the connecting flow path is flush with the bottom of the second flow path.

6. The bathroom drainage unit according to claim 1 , wherein the first flow path and the second flow path are connected to the same drain pipe connection hole.

7. The first flow path is a first rising portion that rises toward the downstream side on the bottom surface; a first water seal determining section connected to the downstream side of the rising section and determining a water seal height in the first flow path; The second flow path is a second rising portion that rises toward the downstream side on the bottom surface; a second water seal determining section connected to the downstream side of the rising section and determining a water seal height in the second flow path; The bathroom drainage unit according to claim 6 , wherein the first flow path and the second flow path are connected downstream of the first water seal regulating portion and the second water seal regulating portion.

8. The first flow path is The pipe further has a first descending portion, which descends downstream on the bottom surface of the pipe, downstream of the first water seal defining portion, The second flow path is The second descending portion is located downstream of the second water seal defining portion and descends downstream on the bottom surface. The bathroom drainage unit of claim 7, wherein the first flow path and the second flow path are connected downstream of the first descending section and the second descending section, or downstream of the first descending section and the second descending section.

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