Drain cover and tank body system

Abstract

To provide a drain port cover and a tank body system having the drain port cover, wherein the drain port cover can prevent air from stagnation and suppress a water level from rising when draining water.SOLUTION: A drain port cover 12 of the present invention comprises: a cover body 20 that can shield a drain port 14C in plan view; a base part 28 that hangs down from a lower surface of the cover body 20 on a drain port side, and whose outer surface guides water that has flowed into a tank body toward the drain port; and a lower part base part 29 that is formed so as to be continuous with the base part 28 downward from an end part of the base part 28, and has an outer surface for allowing water flowing from the outer surface of the base part 28 to flow into the drain port. The base part 28 and the lower part base part 29 have cavities, an upper space part 38 is formed between the lower surface of the cover body 20 and the base part 28, and the upper space part 38, the base part 28 and a hollow part inside the lower part base part 29 communicate with each other.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a drain cover and a tank body system suitable for use in a washroom or the like. [Background technology]

[0002] Conventionally, various shapes and sizes of washbasin equipment in sanitary facilities have been put into practical use to accommodate a variety of installation environments. Recently, the designs and shapes of basins, also known as washbasins or hand basins, have become increasingly diverse. This trend is thought to be driven by the need for miniaturization, or even miniaturization, of basins, particularly as installation spaces become more confined. Regardless of the shape and size of basins, such as washbasins and hand basins, various technologies have been disclosed to promote drainage through drain outlets installed in the basins. These technologies are applied to or near drain plugs, which are installed to improve the appearance of the drain outlet and / or to temporarily plug the drain outlet (see, for example, Patent Documents 1 and 2). For example, Patent Document 1 discloses a technology for generating a desired water flow below the drain plug to promote smooth drainage. Furthermore, Patent Document 2 discloses a technology for preventing air from interfering with the flow of drainage by venting air present on the drainage pipe below the drain plug when draining water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2018 / 135017 [Patent Document 2] Japanese Patent Application Laid-Open No. 2010-59701 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the water flowing into the drain cover may be foamy and contain air. This foamy water can easily cause air to be entrained, hindering smooth drainage. In other words, the current situation is that air entrainment impairs drainage performance and causes the water level to rise. Furthermore, depending on the direction of the water flow, vortices can form in the tank, and as the water flows into the drain, the vortexes can also entrain air. Furthermore, water flows from opposite directions on the tank can collide, generating air and entraining it, which is also thought to be a factor in hindering smooth drainage.

[0005] Therefore, the intended object of the present invention is to provide a drain outlet cover that can prevent air from accumulating and suppress a rise in water level when draining, and a tank body system that has such a drain outlet cover, in order to solve the above-mentioned problems. [Means for solving the problem]

[0006] The drain cover of this invention comprises a covering body capable of shielding the drain in a planar view, a base hanging down from the lower surface of the covering body on the drain side and having an outer surface that guides water that flows into the tank body toward the drain, and a lower base formed so as to be connected to the base from the lower end of the base downward and having an outer surface that directs water that flows in from the outer surface of the base into the drain, the base and lower base having hollow portions, an upper space portion formed between the lower surface of the covering body and the base, and the upper space portion being connected to the hollow portions inside the base and lower base. In the drain port cover according to claim 2 of the present invention, the cover body and the base are connected via an upper guide portion and / or an internal guide portion. In the drain port cover according to claim 3 of the present invention, the hollow portion of the base is a first internal space that is an exhaust hole. In the drain port cover according to claim 4 of the present invention, the hollow portion of the lower base is a second internal space that is an exhaust hole. In the drain port cover according to claim 5 of the present invention, the internal guide portion is formed with an internal fixing region that is a connecting portion for fixing the base portion to the cover body. In the drain port cover according to claim 6 of the present invention, the internal guide portion is provided so as to protrude from the rounded base portion, which is the inner surface of the base portion, toward the central axis direction of the cover body. In the drain port cover according to claim 7 of the present invention, the internal fixing region is formed from the side surface of the internal guide portion on the central axis side of the cover body toward the central axis side of the cover body. In the drain outlet cover according to claim 8 of the present invention, the base is attached to the cover body via the upper guide portion. In the drain cover of claim 9 of this invention, the base comes into contact with the cover via the upper guide portion, thereby forming the upper space portion, which is an exhaust hole, between the lower surface and the upper end of the base, and the lower surface, which is the surface of the cover on the drain hole side, slopes downward and away from the upper surface of the cover as it moves from the outside to the center. In the drain outlet cover according to claim 10 of the present invention, the cover body has a tapered portion formed in an inverted cone shape on the lower surface thereof. The drain hole cover of claim 11 of this invention has a lower surface, which is the surface of the cover body facing the drain hole, that has a smoothly tapered surface that gradually slopes from the outer peripheral edge of the cover body toward the center of the cover body toward the lower side, which is the side facing the drain hole. In the drain outlet cover according to claim 12 of the present invention, the boundary portion where the base connects to the lower surface of the cover body, which is the surface on the drain outlet side, is formed in an arc shape or a circular arc shape. In the drain cover of claim 13 of this invention, the base is formed in a columnar shape almost entirely, and the boundary area near the lower surface of the cover, which is the surface on the drain side of the cover, is formed in an arc or circular arc shape that expands outward along the lower surface of the cover. In the drain outlet cover according to claim 14 of the present invention, the tapered portion of the cover body is attached to the arc-shaped or circular arc-shaped boundary portion of the base via the upper guide portion. In the drain port cover according to claim 15 of the present invention, the lower base portion is cylindrical. The drain cover of claim 16 of this invention has at least three guide walls whose outer surface guides water flowing into the tank body toward the drain, and these walls are protruding from an area close to or distant from the lower surface of the cover body, which is the surface of the cover body on the drain side of the base, toward the periphery of the cover body and away from the cover body. The drain cover of claim 17 of the present invention has an internal guide portion that protrudes from a curved base formed on the inner surface of the base toward the central axis of the cover body, and has an internal guide wall on the flat side surface. The drain cover of claim 18 of this invention has an internal guide wall formed inside the first internal space portion, which is continuous from the lower end of the first internal space portion toward the bottom so as to be connected to the first internal space portion, and which forms a space through which air rising from the second internal space portion formed inside the lower base portion is exhausted to the upper space portion at intervals. In the drain port cover according to claim 19 of the present invention, the upper space portion is cylindrical. In the drain port cover according to claim 20 of the present invention, the first internal space portion has a cylindrical shape. In the drain port cover according to claim 21 of the present invention, the second internal space portion is cylindrical. In the drain outlet cover according to claim 22 of the present invention, the inner fixing region is cylindrical. In the drain port cover according to claim 23 of the present invention, the guide wall has a substantially rectangular front shape. The drain outlet cover according to claim 24 of the present invention further comprises a foreign matter removal section below the lower surface of the cover body, which is the surface on the drain outlet side. The drain cover of claim 25 of this invention has a cover attached to a drive member that has the function of moving the drain cover placed within the opening up and down, and the drive member has a cylindrical portion that is cylindrical and consists of a columnar member extending from the cover side toward the drain pipe, and a support portion that is arranged in a state where it protrudes from the outer periphery of one end face of the cylindrical portion, and the cylindrical portion is connected to a transmission member that moves back and forth in response to the displacement of the operating member, and the transmission member moves back and forth in response to the displacement of the operating member, causing it to move up and down, and the transmission member moves back in response to the displacement of the operating member, causing the support portion to move downward, the drain cover to move downward, and the entire outer periphery of the gasket portion comes into contact with the drain pipe outlet portion, thereby closing the drain pipe outlet portion. In the drain cover of claim 26 of this invention, the base is erected vertically in the center of the drain, and water flowing in from the inner surface of the container collides with it, rectifying the water and preventing water flowing in from the opposite direction from interfering with drainage. In the drain cover of claim 27 of this invention, the base has a curved shape in the area close to the cover body, and extends downward in the vertical direction while gradually becoming thinner, making it easier for foreign objects such as hair to slide downward near the drain. In the drain cover of claim 28 of this invention, the base curves and extends upward from a position that is 1.5 to 3 times the diameter of the base below the underside of the cover, reaching the underside of the cover, and bulges out so that the surface that comes into contact with the underside of the cover is smooth. In the drain cover of claim 29 of this invention, the base has a truncated cone shape that curves upward as it extends, and the angle of rise increases as the curve begins and reaches its maximum at the connection point with the cover body. In the drain cover of claim 30 of this invention, the foreign matter removal section comprises a cylindrical removal section main body with a plurality of through holes drilled therein, and the removal section main body is arranged between the lower surface of the cover body and the first ridge region which is the upper end surface of the guide wall, and the foreign matter removal section collects foreign matter that flows in mixed with the drainage water flowing in from the inner surface of the container body, thereby preventing the foreign matter from flowing into the drain. In the drain port cover according to claim 31 of the present invention, at least three of the guide walls are substantially spiral-shaped. In the drain port cover according to claim 32 of the present invention, at least three of the guide walls have an arc-shaped or circular arc-shaped cross section in plan view. A tank body system according to a thirty-third aspect of the present invention has a drain outlet cover according to any one of the first to thirty-second aspects attached to the drain outlet. [Effects of the Invention]

[0007] According to this invention, it is possible to provide a tank body system having a drain plug and a drain outlet cover that can prevent air from accumulating and suppress a rise in water level when draining, even in narrow washbasins and tank bodies of various shapes and sizes.

[0008] The above and other objects, features, and advantages of the present invention will become more apparent from the following detailed description of the preferred embodiments of the present invention, which proceeds with reference to the accompanying drawings. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view illustrating a washroom and hand-washing facility according to a first embodiment of the present invention. [Figure 2] 1 is a perspective view of a tank body with a drain plug according to a first embodiment of the present invention; [Figure 3] 1 is a front view, partially in section, of a tank body with a drain port cover according to a first embodiment of the present invention; [Figure 4] 1 is a front view, partly in section, of a drainage pipe unit according to a first embodiment of the present invention; [Figure 5]1 is a perspective view of a drain outlet cover according to a first embodiment of the present invention; [Figure 6] 1 is a perspective view of a drain outlet cover according to a first embodiment of the present invention; [Figure 7] 1A and 1B are diagrams illustrating a drain outlet cover according to a first embodiment of the present invention, in which (A) is a front diagram and (B) is a side diagram. [Figure 8] 1 is a bottom view of a drain outlet cover according to a first embodiment of the present invention; FIG. [Figure 9] 1A and 1B are oblique views of a drain cover according to a first embodiment of the present invention, in which (A) is a view from diagonally below, and (B) is a view of the base, lower base, and guide wall from diagonally above. [Figure 10A] 8A and 8B are cross-sectional views of the drain outlet cover according to the first embodiment of the present invention, where (A) is a cross-sectional view taken along line XA-XA in FIG. 8 and an enlarged view of part a, and (B) is a cross-sectional view taken along line XB-XB in FIG. 8. [Figure 10B] This is a partially cross-sectional front view diagram showing the flow of water in a washbasin / hand-washing facility. [Figure 11] 6 is a cross-sectional diagram showing a modified example of the structure for attaching the drain outlet cover shown in FIG. 5 to the drain outlet. FIG. [Figure 12] 5A and 5B are cross-sectional views illustrating modified structures for attaching the drain outlet cover to the drain outlet, where (A) shows a state in which the drain outlet cover does not block the drain outlet, and (B) shows a state in which the drain outlet cover blocks the drain outlet. [Figure 13] FIG. 10 is a perspective view of a drain outlet cover according to a second embodiment of the present invention. [Figure 14] FIG. 10 is a perspective view of a drain outlet cover according to a second embodiment of the present invention. [Figure 15] 5A and 5B are diagrams illustrating a drain outlet cover according to a second embodiment of the present invention, in which (A) is a front diagram and (B) is a side diagram. [Figure 16] FIG. 10 is a bottom view of a drain outlet cover according to a second embodiment of the present invention. [Figure 17]This is an oblique diagram of a drain outlet cover that is a second embodiment of the present invention, where (A) is a view from diagonally below, and (B) is a view of the base, lower base, and guide wall from diagonally above. [Figure 18] 16A and 16B are cross-sectional views of a drain outlet cover according to a second embodiment of the present invention, where (A) is a cross-sectional view taken along line XIIIA-XIIIA in FIG. 16 and an enlarged view of part a, and (B) is a cross-sectional view taken along line XIIIB-XIIIB in FIG. 16. [Figure 19] FIG. 10 is a perspective view of a drain outlet cover according to a second embodiment of the present invention. [Figure 20] FIG. 10 is a perspective view of the drain cover showing the flow of water. [Figure 21] FIG. 10 is a cross-sectional diagram of the drain cover showing the flow of water. [Figure 22] FIG. 10 is a perspective view of the drain cover showing the flow of water. [Figure 23] FIG. 10 is a diagrammatic bottom view of the drain cover showing the flow of water. [Figure 24] FIG. 10 is a side view of a drain outlet cover according to a second embodiment of the present invention, to which a foreign object removal section is attached. [Figure 25] 10 is a side cross-sectional view of a drain outlet cover according to a second embodiment of the present invention, to which a foreign matter removal section is attached. FIG. [Figure 26] FIG. 10 is an assembly diagram of a drain outlet cover according to a second embodiment of the present invention, to which a foreign matter removal section is attached. [Figure 27] FIG. 14 is a cross-sectional diagram showing the drain outlet cover shown in FIG. 13 attached to the drain outlet. [Figure 28] FIG. 25 is a cross-sectional diagram showing the drain outlet cover shown in FIG. 24 attached to the drain outlet. [Figure 29] FIG. 14 is a cross-sectional diagram showing a modified example of the structure for attaching the drain outlet cover shown in FIG. 13 to the drain outlet. [Figure 30] 13A and 13B are cross-sectional diagrams showing modified structures for attaching the drain outlet cover to the drain outlet, where (A) shows the state in which the drain outlet cover does not block the drain outlet, and (B) shows the state in which the drain outlet cover blocks the drain outlet. [Figure 31]FIG. 25 is a cross-sectional diagrammatic view showing a modified example of the structure for attaching the drain outlet cover shown in FIG. 24 to the drain outlet. [Figure 32] 24A and 24B are cross-sectional diagrams showing modified structures for attaching the drain outlet cover to the drain outlet, where (A) shows the state in which the drain outlet cover does not block the drain outlet, and (B) shows the state in which the drain outlet cover blocks the drain outlet. [Figure 33] FIG. 10 is a perspective view of a drain outlet cover according to a third embodiment of the present invention. [Figure 34] FIG. 10 is a perspective view of a drain outlet cover according to a third embodiment of the present invention. [Figure 35] 10A and 10B are side diagrams of a drain outlet cover according to a third embodiment of the present invention, in which (A) is a side diagram and (B) is a side cross-sectional view. [Figure 36] FIG. 10 is a bottom diagram of a drain outlet cover according to a third embodiment of the present invention. [Figure 37] 10A and 10B are perspective diagrams of a drain outlet cover according to a third embodiment of the present invention, in which (A) is an assembly drawing and (B) is a side view. [Figure 38] 10A and 10B are diagrams illustrating the drain outlet cover according to the third embodiment of the present invention, showing the flow of water, where (A) is a side view and (B) is a bottom cross-sectional view. [Figure 39] FIG. 34 is a cross-sectional diagram showing the drain outlet cover shown in FIG. 33 attached to the drain outlet. [Figure 40] FIG. 34 is a cross-sectional diagram showing a modified example of the structure for attaching the drain outlet cover shown in FIG. 33 to the drain outlet. [Figure 41] 33A and 33B are cross-sectional diagrams showing modified structures for attaching the drain outlet cover shown in FIG. 33 to the drain outlet, where (A) shows the state in which the drain outlet cover does not block the drain outlet, and (B) shows the state in which the drain outlet cover blocks the drain outlet. DETAILED DESCRIPTION OF THE INVENTION

[0010] (definition) When the drain cover is attached to the drain, the covering side is referred to as the top or upper side, and the drain side is referred to as the bottom or lower side. Also, the top in the vertical direction is referred to as the top or upper side, and the bottom is referred to as the bottom or lower side. When the drain cover is attached to the drain, the direction perpendicular to or intersecting the perpendicular line extending from the cover body or the vertical direction is referred to as the outside, right or left side, or radial direction. Also, when the drain cover is attached to the drain, the edge side of the drain is referred to as the outside, right or left side, or radial direction.

[0011] Hereinafter, a drain outlet cover and a tank body system including a drain outlet cover-equipped tank body according to the present invention will be described with reference to Figs.

[0012] The drain outlet cover and the tank body system equipped with the drain outlet cover according to the present invention are suitable for use in washroom and hand-washing facilities, which are sanitary facilities for washing and hand-washing installed in homes and stores, for example. The washbasin / hand-washing equipment 10 shown in FIG. 1 is an example of equipment that is particularly suitable for installation in a limited, small space within a store, and is therefore suitable for so-called space saving.

[0013] A washbasin / hand-washing facility 10 equipped with a tank body system according to the present invention comprises a tank body 14 with this drain outlet cover 12, a discharge device 18 that discharges clean water into the tank body 14, and a drainage device (drainage pipe unit) 16 that discharges cold water or hot water, which is water discharged from this discharge device 18 into the tank body 14 of the drain outlet cover 12, from the tank body 14. The washbasin / hand-washing facility 10 further includes a water supply device (not shown) for supplying clean water to the discharge device 18 . As shown in Fig. 1, the discharge device 18 is installed near the bathroom / hand-washing equipment 10. In the figure, the discharge device 18 has a discharge device main body 290 that extends from the base end to the vicinity of the drain outlet cover 12 and guides the clean water, a discharge port 292 that is provided at the tip of the discharge device main body 290 and that discharges the clean water, and an operating unit 294 that controls whether or not the clean water is supplied from the discharge port 292, and the strength of the supply.

[0014] In the washbasin / hand-washing facility 10, a drain outlet cover 12 is disposed on a drain outlet 14c that constitutes a drain opening formed below the tub body 14. The drain outlet cover 12 is configured to be detachable or insertable into the drain outlet 14c. The drain outlet 14c is connected to a drainage device (drain pipe unit) 16 for connection to a sewer pipe.

[0015] The drain outlet cover 12 constituting the drainage device (drainage pipe unit) 16 of the present invention is attached directly or indirectly to the drain outlet 14c and the vessel drain outlet portion 52 constituting a drainage opening formed in the lower part of the vessel body 50 of the tank body 14 constituting a washbasin, hand washing basin, etc. In this embodiment, the container body 50 constituting the tank body 14 has a circular or square upper opening 14a and a lower opening 14b formed on the opposite side of the upper opening 14a, and a drain pipe body 60 having a drain outlet 14c that is circular in plan view is attached to the lower opening 14b, forming the drain outlet 14c. More specifically, the vessel body 50 has a structure corresponding to the outer shape of the drain pipe body 60 so that the vessel body drain outlet portion 52 formed on the bottom surface 56 on the tank body 14 side of the inner surface 54 that receives water can be fitted with the drain pipe body 60 that constitutes the drainage device 16.

[0016] The drain outlet cover 12 of the present invention comprises a covering body 20 capable of shielding the drain outlet 14c in a planar view, a base 28 hanging down from the lower surface of the covering body 20 on the drain outlet side and having an outer surface that guides water that flows into the tank body 14 toward the drain outlet 14c, and a lower base 29 formed so as to be connected to the base 28 downward from the lower end of the base 28 and having an outer surface that directs water that flows in from the outer surface of the base 28 into the drain outlet 14c. The base 28 and the lower base 29 have hollow portions, and an upper space 38 is formed between the lower surface of the cover body 20 and the base 28, and the upper space 38 is connected to the internal hollow portions of the base 28 and the lower base 29.

[0017] In the drain cover 12 according to the present invention, the cover body 20 and the base 28 are connected via the upper guide portion 34 a and / or the inner guide portion 33 .

[0018] In the drain port cover 12 according to the present invention, the hollow portion of the base 28 is configured as a first internal space portion 49a which is an exhaust hole. In the drain port cover 12 according to the present invention, the hollow portion of the lower base portion 29 is configured as a second internal space portion 49b which is an exhaust hole.

[0019] In the drain outlet cover 12 according to the present invention, upper guide portions 34a are interposed between the cover body 20 constituting the drain outlet cover body and the base portion 28 attached to the cover body 20 to form an upper space portion 38. In this embodiment, three or more upper guide portions 34a are formed radially as seen from the center of the cover body 20, and the upper space portion 38 is formed between the upper guide portions 34a.

[0020] The base 28 is disposed on the central axis side of the cover 20 so that its upper end faces the lower surface of the lower base 29 . The base 28 is attached to the cover 20 by an internal guide 33, which will be described later. In this embodiment, the base 28 has a guide wall 22 arranged on its outer surface, the upper part of which forms a guide upper part 34a, and the lower surface of the cover body 20 and the upper surface of the guide upper part 34a are joined.

[0021] The base 28 has an inner surface with a rounded inner portion 28A that is formed in an arc or circular arc shape that curves in the circumferential direction of the cover 20. In the base 28, a first internal space 49a serving as an exhaust hole is formed from the curved interior 28A toward the central axis of the cover 20.

[0022] The base 28 has, at its upper portion, a rounded portion 28 a formed in an arc or circular arc shape that curves in the circumferential direction of the cover 20 . The curved portion 28a of the base 28 has a curved surface that guides water that flows along the lower surface of the tapered portion of the cover 20 toward the base 28 below the cover 20 to the drain outlet 14c below.

[0023] The lower base 29 is formed downward from the lower end of the base 28 so as to be continuous with the base 28 . The lower base 29 has an inner surface formed with a columnar interior 29A formed in a circular ring shape. Inside the lower base portion 29, a second internal space portion 49b serving as an exhaust hole is formed from the columnar internal portion 29A toward the central axis direction of the cover body 20.

[0024] The first internal space 49a formed inside the base 28 and the second internal space 49b formed inside the lower base 29 are connected, and the first internal space 49a formed inside the base 28 and the second internal space 49b formed inside the lower base 29 come together to form the internal space 49.

[0025] The inner guide portion 33 is provided so as to protrude from a rounded inner portion 28A formed on the inner surface of the base portion 28 toward the central axis direction of the cover body 20. The internal guide portion 33 includes an internal guide wall 23 that protrudes from the curved interior 28A toward the center so as to define the first internal space portion 49a. The internal guide wall 23 is formed inside the first internal space 49a formed inside the base 28, and forms a space through which air rising from the second internal space 49b formed inside the lower base 29, which is located lower than the first internal space 49a formed inside the base 28, is exhausted to the upper space 38 at intervals.

[0026] The covering body 20 of the drain outlet cover 12 has a plate portion 20a that is circular in a plan view, called a drain plug or drain tray, and is also called a blind plate. The plate portion 20a covers the drain outlet 14c so that the drain outlet 14c cannot be seen from above, and is configured to cover the inner surface 54 of the tank body 14 around the drain outlet 14c.

[0027] The lower surface of the cover body 20, which is the surface on the drain outlet 14c side, is inclined downward toward the drain outlet 14c in a direction away from the upper / ceiling side of the cover body 20 toward the drain outlet 14c, which is the lower side, as it moves from the outside / edge side of the drain outlet 14c toward the center, i.e., inside.

[0028] The cover 20 has a tapered portion 20c having a tapered surface formed in an inverted cone shape on the lower surface thereof to prevent air from accumulating.

[0029] The lower surface of the cover body 20, which is the surface facing the drain outlet 14c, is formed in a flat shape that slopes downward from the outer peripheral edge of the cover body 20, i.e., the edge peripheral edge of the drain outlet 14c, toward the central axis of the cover body 20, which is the drain outlet 14c side.

[0030] The guide wall 22 has a dispersion surface 24 that disperses the flow of water when water from outside the drain outlet 14c collides with it, and a guide surface 26 that guides water to the center of the cover body 20, causing water flowing in from different directions to collide with each other and encouraging the water to fall downward.

[0031] The drain outlet cover 12 according to the present invention is configured so as to be directly supported by the guide wall 22 on the drain outlet 14c.

[0032] The upper guide portions 34 a of the guide walls 22 are formed so that their upper ends come into contact with the lower surface of the cover 20 , and the upper guide portions 34 a and the guide walls 22 hang down from the lower surface of the cover 20 . In addition, the internal guide portion 33 forms an internal fixed region 44A which serves as a connecting portion attached to the lower surface of the cover body 20 so as to form an upper space portion 38 above the upper end portion of the internal guide portion 33, and by forming a protrusion portion 20b on the lower surface of the cover body 20 to which the internal guide portion 33 is attached, the protrusion portion 20b and the internal fixed region 44A are connected so as to hang down from the lower surface of the cover body 20, thereby forming an upper space portion 38 between the cover body 20 and the internal guide portion 33.

[0033] The front shape of the upper end of the guide upper portion 34a, which comes into contact with the lower surface of the cover body 20, is formed in an arc or circular arc shape that curves circumferentially from the central axis of the cover body 20 on the lower surface of the cover body 20.

[0034] The base 28 is formed downward from the lower end of the upper guide portion 34a so as to be continuous with the lower end of the upper guide portion 34a.

[0035] When the upper guide portion 34a and the curved portion 28a of the base 28 are formed to hang down from the lower surface of the covering body 20, the lower base 29, which is formed downward from the lower end of the base 28 so as to be connected to the base 28, is attached to the covering body 20 via the upper guide portion 34a. However, if the internal guide portion 33 and the protrusion portion 20b of the cover body 20 are formed to be fixed to the lower surface of the cover body 20 so as to protrude upward from the upper end portion of the internal guide portion 33, an upper space portion 38 can be formed and attached to the cover body 20.

[0036] When the base 28 and the lower base 29 are attached to the cover 20 with the upper guide portion 34a interposed therebetween, the lower surface of the cover 20 and the rounded portion 28a of the base 28 are arranged to face each other.

[0037] When the base 28 and the lower base 29 are attached to the cover 20 via the upper guide portion 34a and / or the protrusion 20b, an upper space 38, which is an exhaust hole, is formed between the cover 20 and the upper end of the base 28. The upper space 38 is continuous with an internal space 49 formed by combining a first internal space 49a, which is an exhaust hole formed inside the base 28, and a second internal space 49b, which is an exhaust hole formed inside the lower base 29.

[0038] In the drainage device (drainage pipe unit) 16 constituting the tank body system, the configuration downstream of the drainage port 14c is roughly as follows, as shown in FIGS. The drain pipe body 60 has a flange 60a at its upper end, and a drain port 14c that constitutes a drain opening is formed inside the flange 60a, and a space into which the drain port cover 12 is fitted is formed. The drain outlet 14c is the upper part of the drain pipe drain outlet portion 60c of the drain pipe main body 60, which is arranged so that the vessel body drain outlet portion 52 of the tank body 14 is blocked with a flange 60a and the circular pipe portion extends downward, and is formed as an opening excluding the tapered portion.

[0039] A drain pipe main body 60 is provided directly below the tank body 14. The drain pipe main body 60 is fixed to the tank body 14 by tightening a lock nut 62 while maintaining waterproofing via a sliding gasket 64, a triangular gasket 66, and a sponge gasket 68. A drain pipe 70 is provided downstream of the drain pipe main body 60. The drain pipe 70 is fixed to the drain pipe main body 60 by tightening a fixing nut 72 while maintaining waterproofing via a gasket 74. A male thread 60b is formed on the circumferential surface of the drain pipe main body 60, and the lock nut 62 and fixing nut 72 are configured to be screwed onto the drain pipe main body 60.

[0040] Furthermore, the drainage device (drainage pipe unit) 16 constituting the tank body system has an S-trap 78 provided downstream of the drainage pipe 70. The S-trap 78 is connected to the drainage pipe 70 by fastening a fixing nut 76. The S-trap 78 has a configuration in which two pipes with a U-shaped outer shape are joined by a fixing nut 73 via a packing 75. The S-trap 78 retains the wastewater from the drainage pipe 70 in the downwardly curved part as a seal, thereby preventing odors and gases from the pipes further downstream of the S-trap 78 from rising up to the drainage pipe 70.

[0041] The tank body 14 is provided with an overflow hole 58 at the top for draining water.

[0042] (First embodiment) Next, a drain port cover 12 according to a first embodiment of the present invention will be described mainly with reference to FIGS.

[0043] (whole stopper) The covering body 20 is a circular dish-shaped body in a plan view, also known as a blind plate, and the plate portion 20a is configured to cover the drain outlet 14c so that it cannot be seen from above the drain outlet 14c, and to cover the inner surface 54 of the tank body 14 around the drain outlet 14c, and when the drain outlet cover 12 is attached to the drain outlet 14c, it is fixed in a floating state above the drain outlet 14c.

[0044] (base) The base 28 is approximately inverted truncated cone in shape and includes a curved interior 28A, which is an inner surface formed in a curved shape that extends almost entirely upward toward the outside on the lower surface of the covering body 20, and a curved portion 28a, which is an outer surface that is arc-shaped or circular arc-shaped and extends almost entirely upward toward the outside on the lower surface of the covering body 20.

[0045] The base 28 has an internal space 49 (first internal space 49a) formed from the rounded interior 28A toward the central axis of the cover 20.

[0046] (Lower base) The lower base portion 29 is formed so as to be continuous with the base portion 28 downward from the lower end of the base portion 28 . The lower base 29 has an internal space 49 (second internal space 49b) formed from the surface of the columnar interior 29A toward the central axis of the cover 20. The first internal space 49 a of the base 28 and the second internal space 49 b of the lower base 29 are continuous and form a single internal space 49 .

[0047] (Internal guide) The inner guide portion 33 is formed so as to protrude from the rounded inner portion 28A inside the base portion 28 toward the central axis of the cover body 20. The internal guide portion 33 is formed with an internal guide wall 23 formed to define an internal space portion 49 (first internal space portion 49a) and an internal fixing region 44A for attachment to the cover body 20. The lower base 29 is formed downward from the lower end of the base 28 so that the annular columnar interior 29A formed therein is continuous with the curved interior 28A formed inside the base 28.

[0048] The internal guide walls 23 are arranged at intervals, and between them an internal space portion 49 (first internal space portion 49a) is formed which is connected to an internal space portion 49 (second internal space portion 49b) of a circular-ring-shaped columnar interior 29A formed inside the lower base 29 below the cover body 20.

[0049] The inner guide wall 23 is a plate-like body that extends downward from an upper space 38 formed in the lower part of the cover body 20 . In this embodiment, the inner guide wall 23 is a plate-like body whose flat surface is substantially rectangular and whose front view is substantially triangular. The inner guide wall 23 has a boundary region that joins with the inner rounded interior 28A of the base 28, and the front surface thereof is formed in an arc or circular arc shape so as to fit along the inner rounded interior 28A of the base 28.

[0050] The internal guide wall 23 is a plate-like body that extends downward from the side of the upper space portion 38 formed at the bottom of the cover body 20 in the circumferential direction and downward direction of the cover body 20, and the shape of the front surface of the boundary line that contacts the curved interior portion 28A formed on the inner surface of the base 28 is tapered. The internal guide wall 23 is formed inside the curved interior 28A and is formed from the top to the bottom of the first internal space 49a so as to partition the interior of the first internal space 49a, which is an exhaust hole, and forms a space through which air rising from the second internal space 49b, which is an exhaust hole formed inside the lower base 29, is exhausted to the upper space 38.

[0051] (Covering body) The cover 20 includes a dish-shaped plate portion 20a that is circular in plan view and is formed so as to be able to shield the drain outlet in plan view.

[0052] The surface of cover 20 facing the drain outlet, i.e., the lower surface, is inclined from the outer edge of the drain outlet toward the center, i.e., the inside, so that it moves downward, i.e., toward the drain outlet, and away from the upper part of the main body, i.e., the ceiling side. In other words, the lower surface of cover 20 is formed with a tapered portion 20c having an inverted cone-shaped tapered surface that becomes thinner as it goes downward.

[0053] The tapered surface of the tapered portion 20c formed on the lower surface of the cover 20 is configured to face the rounded inner portion 28A formed inside the base portion 28.

[0054] The lower surface of the covering body 20, which is the surface on the drain outlet side, has a tapered portion 20c that slopes from the drain outlet edge side periphery, which is the outer edge of the covering body 20, toward the central axis of the pillar body and toward the lower side, which is the drain outlet side, and is formed into an overall smooth surface.

[0055] This first embodiment of the drain outlet cover 12 is attached in a floating state with a space between the cover body 20 and the edge of the drain outlet 14c, and is fixed to the drain outlet 14c in a draining position that allows drainage through the drain outlet cover 12.

[0056] The underside of the cover 20 is provided with a protrusion 20b, which serves as a connecting part for fixing the upper guide part 34a, the base 28 and the lower base 29, by fitting a columnar member 44a protruding from an attachment hole 44b, which is a through hole provided inside the internal fixing region 44A of the internal guide part 33 provided inside the base 28.

[0057] (Guide wall) The guide wall 22 hangs down from the lower surface of the cover 20 on the drain outlet side, and is formed integrally with the base 28. The guide wall 22 extends from the lower surface of the cover body 20, which is the surface on the drain outlet side, toward the drain outlet side, i.e., downward, and has an arc-shaped or circular arc-shaped guide upper portion 34a at the boundary portion where it connects to the lower surface, which is the surface on the drain outlet side of the cover body 20. The guide wall 22 protrudes downward from the drain outlet side surface, i.e., the lower surface, of the cover body 20, and is provided in contact with or near the drain outlet side lower surface of the cover body 20 so that the guide wall 22 extends toward the periphery of the cover body 20 and away from the cover body 20.

[0058] Between the guide walls 22, a space 48 (first space 48a) is formed below the cover body 20, which is connected to the inner surface 54 of the container body 50, and below the guide walls 22, a space 48 (second space 48b) is formed which is connected to the drain outlet 14c.

[0059] The guide wall 22 is a plate-like body that extends downward from the lower surface of the cover body 20. In this embodiment, the flat surface is a plate-like body that is approximately pentagonal when viewed from the front and has an approximately rectangular shape. The guide wall 22 has an upper end that gradually rises from the base portion 28 side toward the outside so as to follow the tapered portion 20c of the cover body 20.

[0060] The guide wall 22 has a constant width extending radially from the cover body 20 toward the drain outlet side from the perpendicular line passing through the center of the cover body 20 and a constant height extending vertically from the underside of the cover body 20, and is provided with a first region 30 extending downward from the cover body 20 and allowing water flowing from the tank body 14 to the drain outlet 14c to flow in an approximately horizontal direction, and a second region 32 that is fitted into the drain outlet 14c to fix it to the tank body 14.

[0061] The guide wall 22 has a first ridge region 40 extending downward at a constant height from the covering body 20, and a second ridge region 42 whose width decreases from the base 28 on the side of the perpendicular line passing through the center of the covering body 20 in a region near the lower end. The first ridge region 40 and the second ridge region 42 are outer surfaces of the guide wall 22 formed on the outside of the guide wall 22 opposite to the base portion 28 side.

[0062] The guide wall 22 is a plate-like body extending downward from the cover body 20 side in the circumferential direction and downward of the cover body 20, and is provided with planar guide surfaces 26 (first guide surface 26a and second guide surface 26b) on both sides.The guide surfaces 26 extend in a direction approximately parallel to a perpendicular line passing through the center of the cover body 20, and the first guide surface 26a and the second guide surface 26b, which are surfaces that extend in a direction approximately perpendicular to the perpendicular line, are configured to expand in the circumferential direction of the cover body 20 as they approach the base 28 side.The guide wall 22 has a tapered cross section and is configured to guide water from the outside to the inside along its surface, generating a swirling flow.

[0063] The outer surface of the guide wall 22 is provided with a flat dispersion surface 24 formed between a first guide surface 26a and a second guide surface 26b formed on the left and right surfaces thereof. The dispersion surface 24 is a flat surface that extends downward from the cover body 20 side, corresponding to the first ridge region 40, and is configured so that water flowing from the inner surface 54 side of the tank body 14 toward the drain outlet 14c collides with it.

[0064] In this embodiment, the guide wall 22 is a plate-like body formed so as to extend outward from a base 28 that extends in a vertical direction parallel to a perpendicular line extending downward from the center of the cover 20 .

[0065] Water flowing in from the outside is dispersed by the dispersion surface 24 of the guide wall 22, and flows horizontally or slightly downward into the first space 48a along the guide surface 26. The flowing-in water then collides with the base 28, and the colliding water flows along the surface of the base 28 through the second space 48b and down into the drain outlet 14c, so that the guide wall 22 and the base 28 guide the water to generate a swirling flow. The guide wall 22 and the base 28 are configured to guide water so that the water flows from the outside into the first space 48a between adjacent guide walls 22, collides with the base 28, and flows down along the surfaces of the base 28 and the guide wall 22.

[0066] In this embodiment, the width of the guide wall 22 , that is, the length from the base 28 in the radial direction of the covering body 20 is set to be 10% or more and 45% or less of the diameter of the covering body 20 . The height of the guide wall 22, that is, the length from the bottom of the cover 20 downward in the vertical direction, is set to be 70% or more and 100% or less of the diameter of the cover 20.

[0067] The guide wall 22 is configured to form a space between the cover 20 and the fixing region 44 into which water flows inward, and is configured so that the dispersion surface 24 faces outward in the space portion.

[0068] Between the guide walls 22, a space 48 (first space 48a) is formed below the cover body 20 and connected to the inner surface 54 of the container body 50, and in this space 48, water becomes a swirling flow.Furthermore, below the guide walls 22, a space 48 (second space 48b) is formed that is connected to the drain outlet 14c, and water flows down without stagnating.

[0069] The first ridge region 40 of the guide wall 22 is configured to be inside the outer periphery of the cover 20 that covers the drain opening 14c and to protrude slightly outside the outer periphery of the drain opening 14c.

[0070] In this embodiment, the fixed areas 44 formed in the second region 32 of the guide wall 22 are arranged in a circular pattern with appropriate intervals between the fixed areas 44 of multiple guide walls 22, and a second space portion 48b is formed between and below the multiple guide walls 22, constituting an opening that serves as a drainage opening communicating with the drain outlet 14c.

[0071] The outer shape of the fixing region 44 of the guide wall 22 is configured to fit into the drain pipe outlet portion 60c of the drain pipe main body 60. The outer shape of the fixed area 44 of the annular guide wall 22 is configured so that when it is fitted into the drain pipe outlet portion 60c of the drain pipe main body 60, the upper end of the fixed area 44 of the annular guide wall 22 is positioned at the upper end portion of the flange 60a, and does not descend below that position toward the drain pipe 70.

[0072] (Connection structure between the cover body, base, and lower base) The upper guide portion 34a and the guide wall 22 are formed so as to hang down from the lower surface of the cover body 20 on the drain outlet side. In addition, the internal guide portion 33 has an internal fixing area 44A formed as a connecting portion that is attached to the lower surface of the cover body 20 so as to form an upper space portion 38 above the upper end of the internal guide portion 33, and by forming a protrusion portion 20b that serves as a connecting portion of the cover body 20 to which it is attached, the protrusion portion 20b that serves as a connecting portion is formed so that it hangs down from the lower surface of the cover body 20. The upper guide portion 34a is formed so as to hang down from the lower surface of the cover body 20, which is the drain outlet side, and extends upward from the curved portion 28a formed in the base 28, so as to be connected to the plate portion 20a of the cover body 20.

[0073] The lower base 29 is formed downward from the lower end of the base 28 so as to be connected to the base 28, and is formed so as to be connected to the upper guide portion 34a and the base 28, which are formed so as to hang down from the lower surface of the cover body 20, which is the drain outlet side.

[0074] When the base 28 is attached to the lower surface of the cover body 20 on the drain outlet side, via the guide upper part 34a and the protrusion part 20b which serves as the connecting part, an upper space part 38 which is an exhaust hole is formed between the lower surface of the cover body 20 on the drain outlet side and the curved interior part 28A formed inside the base 28 facing the cover body 20.

[0075] When the upper guide portion 34a and the protrusion portion 20b serving as the connecting portion are formed to hang down from the lower surface of the cover body 20, the lower base portion 29 formed downward from the lower end portion of the base portion 28 so as to be connected to the base portion 28 is attached to the cover body 20 via the upper guide portion 34a and the protrusion portion 20b serving as the connecting portion. However, if the internal guide portion 33 and the protrusion portion 20b are formed as a connecting portion that is connected to the lower surface of the cover body 20 so as to protrude upward from the upper end of the internal guide portion 33, the base portion 28 and the lower base portion 29 can form an upper space portion 38 and be attached to the cover body 20 without the need for the upper guide portion 34a.

[0076] When the base 28 and the lower base 29 are attached to the cover 20 via the upper guide portion 34a and the protrusion 20b serving as the connecting portion, the lower surface of the cover 20 and the curved portion 28a of the base 28 are positioned facing each other.

[0077] When the base 28 and the lower base 29 are attached to the cover 20 via the upper guide portion 34a and the protrusion 20b which serves as the connecting portion, an upper space 38 which is an exhaust hole is formed between the cover 20 and the upper end of the base 28. The upper space 38 is continuous with an internal space 49 formed by combining a first internal space 49a, which is an exhaust hole formed inside the base 28, and a second internal space 49b, which is an exhaust hole formed inside the lower base 29.

[0078] (Configuration of cover and base) The inclination angle (gradient) of the surface of the cover 20 on the drain outlet side, i.e., the lower surface, is 1 to 5 degrees with respect to the horizontal plane that contacts the lowest part of the lower surface, as shown in FIG. That is, the angle α formed by the horizontal line X on the reference horizontal plane and the straight line Y on the lower surface of the cover 20 is an acute angle, and is equal to or greater than 1 degree and equal to or less than 5 degrees. An inclination angle between 1 and 5 degrees provides optimal drainage. If the angle of inclination is too large, the opening area will decrease and the drainage capacity will decrease.

[0079] The relationship between the area S1, which is the space (A) between the underside of the cover body 20 and the drain outlet of the tank body 14, and the area S2, which is the opening area (B) of the drain outlet inside the drain pipe main body 60, is as follows: S1≧S2 is satisfied.

[0080] Therefore, the relationship among the height h between the lower surface of the cover body 20 and the drain outlet 14c of the tank body 14, the radius r1 of the drain outlet 14c, and the radius r2 of the internal space portion 49 is h≧1 / 2(r1―r22 / r1) When this condition is satisfied, the drainage capacity becomes sufficient, which is preferable. When h < 1 / 2(r1―r22 / r1), the space (A) between the lower surface of the cover body 20 and the drain outlet of the tank body 14 becomes smaller than the opening area (B) of the drain outlet, and the drainage in the said (A) is restricted, so the drainage capacity cannot be fully exerted.

[0081] As shown in FIG. 10B, the height h between the lower surface of the cover body 20 and the drain outlet 14c of the tank body 14 is formed at a height of 25% or more and 65% or less of the diameter D1 of the drain outlet 14c, and the drainage capacity is optimal. If the height (h) is low, the drainage capacity decreases, and if it is high, the appearance becomes poor.

[0082] In this embodiment, the base portion 28 that extends from the drain outlet side of the cover body 20 in the direction of the drain outlet side and downward is, as shown in FIG. 10, an arc-shaped or circular arc-shaped boundary portion that is connected to the surface on the drain outlet side of the cover body 20. The radius of the rounded portion (R) 28 is 10 mm or more and 15 mm or less, and it is a relatively gentle arc surface. When it is within this range, the drainage capacity is optimal. If this radius is too large, the opening area decreases and the drainage capacity drops.

[0083] The relationship between the radius r1 of the drain outlet 14c and the radius r2 (D2 / 2) of the internal space portion 49 is 0.45≦r2 / r1≦0.55. When r2 / r1 < 0.45, the cross-sectional area of the space between the drain pipe main body 60, the base portion 28, and the lower base portion 29 becomes small, so the exhaust capacity of the air contained in the drainage decreases. When 0.55 < r2 / r1, the area of the internal space portion 49 becomes smaller than the cross-sectional area of the space between the drain pipe main body 60, the base portion 28, and the lower base portion 29, so the exhaust capacity of the air contained in the drainage decreases.

[0084] The length L of the internal space 49 is 10 mm or more and 30 mm or less.

[0085] (About water flow) In the drain cover 12 of the first embodiment, as shown in Figure 10A, water flowing in from the outside is dispersed by the dispersion surface 24 of the guide wall 22 and guided along the guide surface 26 and onto the lower surface of the cover body 20, and the water flows horizontally or slightly downward in the first space portion 48a. The flowing-in water then hits the base 28, and the hitting water flows down along the surface of the base 28, rectified by the guide wall 22. The water then flows down along the guide wall 22, the base 28, and the lower base 29 from the second space 48b to the drain outlet 14c. Water flows into a space 48 (first space 48a) between the guide walls 22 below the cover 20 from the inner surface 54 of the container body 50 connected to the space 48 (first space 48a), and forms a swirling flow in the space 48 (first space 48a). The water does not stagnate, but flows down into a space 48 (second space 48b) formed below the base 28 and the guide wall 22 and connected to the drain outlet 14c. At this time, almost no air is entrained, and the water is smoothly drained from the space 48 (second space 48b) to the drain outlet 14c.

[0086] (Air flow) In the drain outlet cover 12 of the first embodiment, as shown in Figure 10B, when water flowing in from the outside is dispersed by the dispersion surface 24 of the guide wall 22 and drained toward the bottom of the drain outlet 14c, the air contained in the drainage flows into an internal space 49 (second internal space 49b) formed inside the lower base 29 toward the central axis of the cover body 20 from an opening formed at the lower end of the lower base 29, which is formed below the drain outlet 14c. When the air contained in the wastewater flows into the internal space 49 (second internal space 49b) of the lower base 29, the air rises and flows into the internal space 49 (first internal space 49a) of the base 28, and then rises along the surface of the curved interior 28A and the internal guide wall 23 and flows into the upper space 38.The air that flows into the upper space 38 is discharged outward from the upper space 38, or passes through the upper space 38 and collides with the cover body 20, and is discharged outward along the surface of the cover body 20. The air contained in the wastewater flows into the internal space 49 (second internal space 49b) of the lower base 29, rises through the internal space 49 formed by the connection of the internal space 49 (first internal space 49a) of the base 28 and the internal space 49 (second internal space 49b) of the lower base 29, and is discharged outward from the upper space 38, or passes through the upper space 38 and collides with the covering body 20, and is discharged outward along the surface of the covering body 20.Even if the wastewater flowing into the drain outlet 14c is foam water containing air, the rise in water level caused by the obstruction of drainage performance due to the entrainment of air can be suppressed, enabling smooth drainage.

[0087] (Variation) Next, a modified example of the structure for attaching the drain port cover 12 according to the first embodiment of the present invention to the drain device 16 will be described mainly with reference to FIGS.

[0088] The modified example of the drain outlet cover 12 shown in Figure 11, which is the first embodiment, differs in that, whereas the drain outlet cover 12 shown in Figure 3 has a space 48 between the cover body 20 and the drain outlet 14c and is fixed in a drainage position that allows drainage through that space 48, this modified example is configured to be operable between a drainage position that allows drainage through the space 48 that forms the drain opening and a plug position that prohibits drainage through the space 48 that forms the drain opening, and is formed so that it can be inserted and removed freely into the drain outlet 14c. A columnar portion 82 having a columnar member 44a formed at the upper end thereof is formed at the upper end of the support portion 84. The cylindrical portion 82 formed atop the support portion 84 is inserted into the mounting hole 44b formed inside the internal fixing region 44A, and when the columnar - shaped member 44a formed on the upper end portion of the cylindrical portion 82 is screwed with the protrusion 20b formed from the lower - side surface of the covering body toward the inside of the covering body 20, the support portion 84 is attached to the drain - port cover 12. The support portion 84 is disposed such that a space for air to rise is formed in the internal space portions 49 (the first internal space portion 49a and the second internal space portion 49b) of the base portion 28 and the lower base portion 29.

[0089] The relationship between the diameter D3 of the internal space portion 49 and the diameter D4 of the support portion 84 is 0.45≦D4 / D3≦0.55 It is preferable to satisfy the above condition. When D4 / D3 < 0.45, the ability of the support portion 84 to support the drain - port cover 12 decreases. When 0.55 < D4 / D3, the cross - sectional area of the internal space portion 49 becomes small, so the exhaust ability of the air exhausted from the internal space portion 49 deteriorates.

[0090] The drain - port cover 12 that constitutes the drainage device (drain - pipe unit) 16 of the modification example is attached to a driving member 80 having a function of moving the covering body 20 up and down. The driving member 80 includes a cylindrical portion 82 composed of a columnar - shaped member 44a that extends from the side of the covering body 20 toward the drain - pipe 70 in a cylindrical shape, and a support portion 84 provided in a state of protruding from the outer - peripheral side of one end surface of the cylindrical portion 82.

[0091] The cylindrical portion 82 is connected to a transmission member 88 that reciprocates with the displacement of the operation member 86. The cylindrical portion 82 moves up and down as the transmission member 88 reciprocates with the displacement of the operation member 86. The drain - port cover 12 is a unit for opening and closing the drain port 14c, and can be installed into the drain - pipe drain - port portion 60c from above the drain - pipe drain - port portion 60c and is formed to be removable from the drain - pipe drain - port portion 60c. In this embodiment, the drain outlet cover 12 can be placed on the drain pipe outlet portion 60c by fitting the drain outlet cover 12 from above the drain pipe outlet portion 60c, and the drain outlet cover 12 can be removed from the drain pipe main body 60 by pulling the drain outlet cover 12 up toward above the drain pipe outlet portion 60c.

[0092] The drain outlet cover 12 that constitutes the drainage device (drain pipe unit) 16 has a plate portion 20a that constitutes a disc-shaped blind plate made of metal, resin, etc., and a gasket attached to the lower part of the cover body 20 that constitutes the drain outlet cover 12. The packing is made of an elastically deformable material, such as rubber or resin, and is formed in a ring shape. The packing is attached to the outer periphery of the protrusion 20b at the bottom of the cover 20.

[0093] Then, as the operating member 86 is displaced, the transmission member 88 moves forward, the support member 84 moves upward, the drain outlet cover 12 moves upward, and the gasket moves away from the drain pipe outlet portion 60c, thereby releasing the drain outlet cover 12 from the drain pipe outlet portion 60c. Meanwhile, as the operating member 86 is displaced, the transmission member 88 moves back, the support member 84 moves downward, the drain outlet cover 12 moves downward, and the entire outer periphery of the four gaskets comes into contact with the drain pipe outlet portion 60c, thereby closing the drain pipe outlet portion 60c.

[0094] The drain cover 12, which is a modified example of the drain cover in this first embodiment, has a foreign matter removal section 200 that acts as a filter to remove foreign matter that attempts to flow into the drain, and is provided on the support section 84 of the drive member 80 of the drain device 16.

[0095] The foreign matter removal section 200 has an area facing upward, that is, facing the drain outlet cover 12 side, so as to remove foreign matter flowing in from above.

[0096] (Second embodiment) Next, a drain outlet cover according to a second embodiment of the present invention will be described with reference to Figures 13 to 32. The drain outlet cover 12 of the second embodiment is a modified version of the guide wall 22 of the drain outlet cover 12 of the first embodiment. In addition, in the description of the second embodiment, the components and elements common to the drain outlet cover of the first embodiment shown in Figures 1 to 12 will be given the same symbols, and the description of the common components and elements will be omitted. The following description will focus on the characteristic constituent elements of the drain outlet cover according to the second embodiment.

[0097] (Guide wall) The guide wall 22 hangs down from the lower surface of the cover 20 on the drain outlet side, and is formed integrally with the base 28 and the lower base 29. The guide wall 22 extends from the lower surface of the cover body 20, which is the surface on the drain outlet side, toward the drain outlet side, i.e., downward, and has an arc-shaped or circular arc-shaped guide upper portion 34a at the boundary portion where it connects to the lower surface, which is the surface on the drain outlet side of the cover body 20. The guide wall 22 protrudes downward from the drain outlet side surface, i.e., the lower surface, of the cover body 20, and is provided in contact with or near the drain outlet side lower surface of the cover body 20 so that the guide wall 22 extends toward the periphery of the cover body 20 and away from the cover body 20.

[0098] The cover 20 has on its underside a protrusion 20b that fits into a mounting hole 44b provided in the internal guide 33 and serves as a fixing portion for fixing the internal guide 33 and the guide wall 22.

[0099] The base 28 is approximately inverted truncated cone in shape and includes a curved interior 28A, which is an inner surface formed in a curved shape that extends almost entirely upward toward the outside on the lower surface of the covering body 20, and a curved portion 28a, which is an outer surface that is arc-shaped or circular arc-shaped and extends almost entirely upward toward the outside on the lower surface of the covering body 20.

[0100] The base 28 is attached to the guide wall 22 and forms part of a guide section 34 that is configured as a separate member from the covering body 20. When the guide section 34 is attached to the covering body 20, the base 28 is disposed at the center of the covering body 20 and is disposed inside the guide wall 22, i.e., on the center side of the covering body 20.

[0101] Between the guide walls 22, a space 48 (first space 48a) is formed below the cover body 20, which is connected to the inner surface 54 of the container body 50, and below the guide walls 22, a space 48 (second space 48b) is formed which is connected to the drain outlet 14c. The guide wall 22 creates an escape route for air bubbles in the space 48 (first space 48a) separated by the guide wall 22 on the opposite side, as water flows from the inner surface 54 of the container body 50 into the space 48 (first space 48a) separated by the guide wall 22.

[0102] The guide wall 22 is a plate-like body that extends downward from a position spaced apart from the lower surface of the cover body 20 . In this embodiment, the plate-like body is substantially inverted L-shaped when viewed from the front. The guide wall 22 has a constant width extending radially of the cover 20 from the perpendicular line passing through the center of the cover 20 toward the drain outlet, and a constant height extending vertically from the underside of the cover 20. The first region 30 extends downward from the cover 20 and allows water flowing from the tank 14 to the drain outlet 14c to flow in a substantially vertical direction. The second region 32 is configured to be fitted into the drain outlet 14c for attachment to the tank 14.

[0103] The guide wall 22 comprises a first region 30 of a rod-like shape with a square cross section extending outward from the base 28 and a second region 32 of a rod-like shape with a square cross section extending downward from the outer end of the first region 30 .

[0104] The guide wall 22 has a first ridge region 40 that extends downward so as to be gradually lower than the base 28, and a second ridge region 42 that reduces in width from the base 28 on the side of the perpendicular line passing through the center of the covering body 20 in a region near the lower end. The first ridge region 40 is the outer surface of the guide wall 22 formed on the outside opposite the base 28 side of the guide wall 22, and the second ridge region 42 is the outer surface of the guide wall 22 formed on the outer edge of the first ridge region 40.

[0105] The guide wall 22 is a plate-like body that extends downward from the cover body 20 side, gradually becoming lower toward one side of the circumferential direction of the cover body 20, and is provided with guide surfaces 26 (first guide surface 26a and second guide surface 26b) on both sides thereof.The guide surfaces 26 extend in a direction approximately parallel to a perpendicular line passing through the center of the cover body 20, and the first guide surface 26a and the second guide surface 26b, which are surfaces that extend in a direction approximately perpendicular to the perpendicular line, are configured to expand in the circumferential direction of the cover body 20.

[0106] The outer surface of the guide wall 22 is provided with a flat dispersion surface 24 formed between a first guide surface 26 a and a second guide surface 26 b formed on the left and right surfaces of the first region 30 . The dispersion surface 24 is a flat surface that extends downward from the base 28 side, corresponding to the first ridge region 40, and is configured so that water flowing from the inner surface 54 side of the tank body 14 toward the drain outlet 14c collides with it and is dispersed to both the left and right before flowing down.

[0107] In this embodiment, the guide wall 22 is a plate-like body formed to extend outward from a base 28 that extends vertically parallel to a perpendicular line extending downward from the center of the cover body 20, and extends outward from the center side of the cover body 20 and is attached to a lower base 29.

[0108] Water flowing in from the outside is dispersed by dispersion surface 24 of guide wall 22, and flows horizontally or slightly downward into first space 48a along guide surface 26. The water then collides with base 28, and guides water by guide wall 22 and base 28 so that the colliding water flows along the surface of base 28 from first space 48a through second space 48b and down to drain outlet 14c. The guide wall 22 and the base 28 are configured to guide water so that the water flows from the outside into the first space 48a between adjacent guide walls 22, collides with the base 28, and flows down along the surfaces of the base 28 and the guide wall 22.

[0109] In this embodiment, the width of the guide wall 22 , that is, the length from the base 28 in the radial direction of the covering body 20 is set to be 10% or more and 45% or less of the diameter of the covering body 20 . The height of the guide wall 22, that is, the length from the bottom of the cover 20 downward in the vertical direction, is set to 25% or more and 60% or less of the diameter of the cover 20.

[0110] The guide wall 22 is configured to form a space between the cover body 20 and the fixing region 44 into which water flows inward, and is configured so that the dispersion surface 24 faces upward in that space portion.

[0111] Between the cover body 20 and the guide wall 22, a space 48 (first space 48a) is formed below the cover body 20, which is connected to the inner surface 54 of the container body 50, and in this space 48, water becomes a swirling flow.Furthermore, below the guide wall 22, a space 48 (second space 48b) is formed which is connected to the drain outlet 14c, and water flows down without stagnating.

[0112] The first ridge region 40 of the first region 30 of the guide wall 22 is configured to be inside the outer peripheral edge of the cover 20 that covers the drain opening 14c and to protrude slightly outside the outer peripheral edge of the drain opening 14c.

[0113] In this embodiment, the fixed areas 44 formed near the lower end of the second area 32 of the guide wall 22 are arranged in a circular pattern with appropriate intervals between the fixed areas 44 of multiple guide walls 22, and an opening (second space 48b) which serves as a drainage opening communicating with the drain outlet 14c is formed between and below the multiple guide walls 22.

[0114] The outer shape of the fixing region 44 of the annular guide wall 22 is configured to fit into the drain pipe outlet portion 60c of the drain pipe main body 60. The outer shape of the fixed area 44 of the annular guide wall 22 is configured so that when it is fitted into the drain pipe outlet portion 60c of the drain pipe main body 60, the upper end of the fixed area 44 of the annular guide wall 22 is positioned at the upper end portion of the flange 60a, and does not descend below that position toward the drain pipe 70.

[0115] (Regarding drainage) According to this second embodiment, as shown in Figures 20 to 23, wastewater flowing in from the inner surface 54 of the container body 50 of the tank body 14 flows along the tapered portion 20c of the cover body 20 into the first space 48a between the guide walls 22, part of which collides with the base 28, and part of which flows into the second space 48b between the guide walls 22. The water that hits the base 28 flows along the base 28 and falls into the second space 48b.

[0116] According to this embodiment, the guide wall 22 obstructs the vortex flow entering the drain outlet 14c, preventing air from being drawn in. Furthermore, the base 28 prevents collision with water coming from the opposite direction, preventing air from being drawn in. The compartment near the base 28 serves as an air outlet when wastewater flows in, preventing air from accumulating.

[0117] As shown in Figures 24 to 26, the foreign matter removal part 200 attached to the drain outlet cover 12 in this second embodiment is called a hair catcher or the like, and is composed of a removal part main body 200a which is approximately circular in plan view and has multiple through holes drilled therein. The foreign matter removal section 200 collects foreign matter such as hair that flows in together with the drainage water flowing in from the inner surface 54 of the container 50, and prevents the foreign matter from flowing into the drain outlet 14c.

[0118] Next, a modified example of the structure for attaching the drain port cover 12 to the drain device 16 according to the second embodiment of the present invention will be described mainly with reference to FIGS.

[0119] The modified example of the drain outlet cover 12, which is the second embodiment, differs in that, whereas the drain outlet cover 12 shown in Figures 13 to 23 and 24 to 26 has a space 48 between the cover body 20 and the drain outlet 14c and is fixed in a drainage position that allows drainage through that space 48, this modified example is configured to be operable between a drainage position that allows drainage through the space 48 that forms the drain opening and a plug position that prohibits drainage through the space 48 that forms the drain opening, and is formed so that it can be inserted and removed freely into the drain outlet 14c.

[0120] The drain outlet cover 12 constituting the drain device (drain pipe unit) 16 of the modified example differs from the second embodiment shown in Figures 13 to 28 in that the outer shape of the guide wall 22 is formed slightly smaller than that of the first embodiment so that it can be inserted into the drain outlet 14c, as shown in Figures 29 to 32. The base 28 is provided with a mounting hole 44b for mounting a columnar member 44a to the internal fixing region 44A. The cover body 20 of the drain outlet cover 12 is attached to a drive member 80 that has the function of moving the drain outlet cover 12, which is placed on the appliance body drain outlet part 52, up and down. The drive member 80 has a cylindrical part 82 made up of a columnar member 44a that is cylindrical and extends from the cover body 20 side toward the drain pipe 70, and a support part 84 that is provided in a state that protrudes from the outer periphery of one end face of the cylindrical part 82.

[0121] The cylindrical portion 82 is connected to a transmission member 88 that reciprocates in response to the displacement of the operating member 86 . The cylindrical portion 82 moves up and down as the transmission member 88 reciprocates in response to the displacement of the operating member 86 . The drain outlet cover 12 is a unit for opening and closing the drain outlet 14c, and is configured to be installable inside the drain pipe outlet portion 60c from above the drain pipe outlet portion 60c, and also to be removable from the drain pipe outlet portion 60c. In this embodiment, the drain outlet cover 12 can be placed on the drain pipe outlet portion 60c by fitting the drain outlet cover 12 from above the drain pipe outlet portion 60c, and the drain outlet cover 12 can be removed from the drain pipe main body 60 by pulling the drain outlet cover 12 up toward above the drain pipe outlet portion 60c.

[0122] The drain outlet cover 12 that constitutes the drainage device (drainage pipe unit) 16 comprises a plate portion 20a that constitutes a disc-shaped blind plate made of metal, resin, etc., and a gasket attached to the lower part of the covering body 20 that constitutes the drain outlet cover 12. The packing is made of an elastically deformable material, such as rubber or resin, and is formed in a ring shape. The packing is attached to the outer periphery of the protrusion 20b at the bottom of the cover 20.

[0123] Then, as the operating member 86 is displaced, the transmission member 88 moves forward, the support member 84 moves upward, the drain outlet cover 12 moves upward, and the gasket moves away from the drain pipe outlet portion 60c, thereby releasing the drain outlet cover 12 from the drain pipe outlet portion 60c. Meanwhile, as the operating member 86 is displaced, the transmission member 88 moves back, the support member 84 moves downward, the drain outlet cover 12 moves downward, and the entire outer periphery of the gasket comes into contact with the drain pipe outlet portion 60c, thereby closing the drain pipe outlet portion 60c.

[0124] As shown in FIGS. 29 and 30, the drain outlet cover 12 in the second embodiment is provided with a foreign matter removal section 200 that acts as a filter to remove foreign matter that tries to flow into the drain outlet 14c.

[0125] The foreign matter removal section 200 in this embodiment is what is called a hair catcher or the like, and is formed by drilling a plurality of through holes 200b in a cylindrical removal section main body 200a. The remover body 200 a is disposed between the lower surface of the cover body 20 and the first ridge region 40 which is the upper end surface of the guide wall 22 .

[0126] Also, as shown in Figures 31 and 32, the foreign matter removal part 200 attached to the drain outlet cover 12 in this second embodiment is called a hair catcher or the like, and is made up of a removal part main body 200a which is approximately circular in plan view and has multiple through holes drilled therein. The foreign matter removal section 200 collects foreign matter such as hair that flows in together with the drainage water flowing in from the inner surface 54 of the container 50, and prevents the foreign matter from flowing into the drain outlet 14c.

[0127] (Third embodiment) Next, a drain outlet cover according to a third embodiment will be described with reference to Figures 33 to 41. The drain outlet cover 12 according to the third embodiment is an embodiment in which the guide wall 22 of the drain outlet cover 12 according to the first embodiment is modified. In addition, in the description of the third embodiment, the components and elements common to the drain outlet cover of the first embodiment shown in Figures 1 to 12 will be given the same symbols, and the description of the common components and elements will be omitted. The following description will focus on the characteristic constituent elements of the drain outlet cover according to the third embodiment.

[0128] (Guide wall) The guide wall 22 hangs down from the lower surface of the cover 20 on the drain outlet side, and is formed integrally with the base 28 and the lower base 29. The guide wall 22 extends from the lower surface of the cover body 20, which is the surface on the drain outlet side, toward the drain outlet side, i.e., downward, and has an arc-shaped or circular arc-shaped guide upper portion 34a at the boundary portion where it connects to the lower surface, which is the surface on the drain outlet side of the cover body 20. The guide wall 22 protrudes downward from the drain outlet side surface, i.e., the lower surface, of the cover body 20, and is provided in contact with or near the drain outlet side lower surface of the cover body 20 so that the guide wall 22 extends toward the periphery of the cover body 20 and away from the cover body 20.

[0129] The cover 20 has on its underside a protrusion 20b that fits into a mounting hole 44b provided in the internal guide 33 and serves as a fixing portion for fixing the internal guide 33 and the guide wall 22.

[0130] The base 28 is approximately inverted truncated cone in shape and includes a curved interior 28A, which is an inner surface formed in a curved shape that extends almost entirely upward toward the outside on the lower surface of the covering body 20, and a curved portion 28a, which is an outer surface that is arc-shaped or circular arc-shaped and extends almost entirely upward toward the outside on the lower surface of the covering body 20.

[0131] The guide wall 22 is a plate-like body that extends downward from the lower surface of the cover body 20. In this embodiment, the front side of the plate is a corrugated plate having a rectangular shape. The guide wall 22 has an upper end that gradually rises from the base portion 28 side toward the outside so as to follow the tapered portion 20c of the cover body 20.

[0132] The guide wall 22 has a constant width extending radially from the cover body 20 toward the drain outlet side from the perpendicular line passing through the center of the cover body 20 and a constant height extending vertically from the underside of the cover body 20, and is provided with a first region 30 extending downward from the cover body 20 and allowing water flowing from the tank body 14 to the drain outlet 14c to flow in an approximately horizontal direction, and a second region 32 that is fitted into the drain outlet 14c to fix it to the tank body 14.

[0133] The guide wall 22 has a first ridge region 40 extending downward at a constant height from the covering body 20, and a second ridge region 42 whose width decreases from the base 28 on the side of the perpendicular line passing through the center of the covering body 20 in a region near the lower end. The first ridge region 40 and the second ridge region 42 are outer surfaces of the guide wall 22 formed on the outside of the guide wall 22 opposite to the base portion 28 side.

[0134] The guide wall 22 is a plate-like body that is warped so as to gradually transition downward from the cover body 20 side toward one side of the circumferential direction of the cover body 20, and is provided with spherical guide surfaces 26 (first guide surface 26a and second guide surface 26b) on both sides.The guide surfaces 26 extend in a direction approximately parallel to a perpendicular line passing through the center of the cover body 20, and the first guide surface 26a and the second guide surface 26b, which are surfaces that extend in a direction approximately perpendicular to the perpendicular line, are configured to expand in the circumferential direction of the cover body 20 as they move toward the base 28 side.The guide wall 22 has a tapered cross section and is configured to guide water from the outside to the inside along its surface, generating a swirling flow.

[0135] The outer surface of the first region 30 of the guide wall 22 is provided with a spherical dispersion surface 24 formed between a first guide surface 26a and a second guide surface 26b formed on the left and right surfaces thereof. The dispersion surface 24 is a spherical surface that extends downward from the cover body 20 side, corresponding to the first ridge region 40, and is configured so that water flowing from the inner surface 54 side of the tank body 14 toward the drain outlet 14c collides with it.

[0136] In this embodiment, the guide wall 22 is a plate-like body formed to extend outward from a base 28 that extends vertically parallel to a perpendicular line extending downward from the center of the cover body 20, and extends outward from the center side of the cover body 20, and is attached to the cover body 20, the base 28, and the lower base 29.

[0137] The boundary portion of the curved interior 28A facing the cover 20 from the drain outlet side, i.e., the lower surface, toward the drain outlet side, i.e., downward, with the upper space 38 sandwiched between them, is formed in an arc or circular arc shape. That is, the curved interior 28A has a curved portion 28a, which is an arc-shaped surface that gradually widens outward, at the upper part facing the cover 20 with the upper space 38 in between.

[0138] Water flowing in from the outside is dispersed by the dispersion surface 24 of the guide wall 22, and flows horizontally or slightly downward into the first space 48a along the guide surface 26. The flowing-in water then collides with the base 28, and the colliding water flows along the surface of the base 28 through the second space 48b and down into the drain outlet 14c, so that the guide wall 22 and the base 28 guide the water to generate a swirling flow. The guide wall 22 and the base 28 are configured to guide water so that the water flows from the outside into the first space 48a between adjacent guide walls 22, collides with the base 28, and flows down along the surfaces of the base 28 and the guide wall 22.

[0139] In this embodiment, the width of the guide wall 22 , that is, the length from the base 28 in the radial direction of the covering body 20 is set to be 10% or more and 45% or less of the diameter of the covering body 20 . The height of the guide wall 22, that is, the length from the bottom of the cover 20 downward in the vertical direction, is set to be 70% or more and 100% or less of the diameter of the cover 20.

[0140] In this embodiment, the guide wall 22 has a fixing region 44 formed in the region of the second ridge region 42 to fit into the drainage opening 14c. The fixing region 44 is configured as a flat surface that slopes inward as it extends downward.

[0141] The guide wall 22 is configured to form a space between the cover 20 and the fixing region 44 into which water flows inward, and is configured so that the dispersion surface 24 faces outward in the space portion.

[0142] Between the guide walls 22, a space 48 (first space 48a) is formed below the cover body 20 and connected to the inner surface 54 of the container body 50, and in this space 48, water becomes a swirling flow.Furthermore, below the guide walls 22, a space 48 (second space 48b) is formed that is connected to the drain outlet 14c, and water flows down without stagnating.

[0143] Between the guide walls 22, a space 48 (first space 48a) is formed below the cover body 20, which is connected to the inner surface 54 of the container body 50, and below the guide walls 22, a space 48 (second space 48b) is formed which is connected to the drain outlet 14c.

[0144] The first ridge region 40 of the guide wall 22 is configured to be inside the outer periphery of the cover 20 that covers the drain opening 14c and to protrude slightly outside the outer periphery of the drain opening 14c.

[0145] In this embodiment, the fixed areas 44 formed near the lower end of the second area 32 of the guide wall 22 are arranged in a circular pattern with appropriate intervals between the fixed areas 44 of multiple guide walls 22, and an opening (second space 48b) which serves as a drainage opening communicating with the drain outlet 14c is formed between and below the multiple guide walls 22.

[0146] The outer shape of the fixing region 44 of the annular guide wall 22 is configured to fit into the drain pipe outlet portion 60c of the drain pipe main body 60. The outer shape of the fixed area 44 of the annular guide wall 22 is configured so that when it is fitted into the drain pipe outlet portion 60c of the drain pipe main body 60, the upper end of the fixed area 44 of the annular guide wall 22 is positioned at the upper end portion of the flange 60a, and does not descend below that position toward the drain pipe 70.

[0147] (About water flow) In the drain cover 12 of the third embodiment, as shown in Figure 38, water flowing in from the outside is dispersed by the dispersion surface 24 of the guide wall 22 and guided along the guide surface 26 and to the lower surface of the cover body 20, and the water flows horizontally or slightly downward in the first space portion 48a. The flowing water then collides with the base 28, and the colliding water flows along the surface of the base 28 and is straightened by the shape (arc shape) of the guide wall 22, generating a swirling flow. The water is then regulated along the guide wall 22 and the base 28, and flows down from the second space 48b into the drain port 14c. Water flows into a space 48 (first space 48a) between the guide walls 22 below the cover 20 from the inner surface 54 of the container body 50 connected to the space 48 (first space 48a), and forms a swirling flow in the space 48 (first space 48a). The water does not stagnate, but flows down into a space 48 (second space 48b) formed below the base 28 and the guide wall 22 and connected to the drain outlet 14c. At this time, almost no air is entrained, and the water is smoothly drained from the space 48 (second space 48b) to the drain outlet 14c.

[0148] (Variation) Next, a modified structure for attaching the drain port cover 12 to the drain device 16 according to the third embodiment of the present invention will be described mainly with reference to FIGS.

[0149] The drain outlet cover 12, which is the third embodiment of the present invention, can be attached to the drain device 16 and configured to be operable between a drain position in which drainage can occur through the space 48 that forms the drain opening, and a plug position in which drainage is prohibited through the space 48 that forms the drain opening. As shown in FIG. 41, this modified example of the drain outlet cover 12 according to the third embodiment is configured such that a hole 44c is drilled in the base 28, and a support portion 84 of the drive member 80 is fixed to the hole 44c.

[0150] As described above, the embodiment of the present invention has been disclosed in the above description, but the present invention is not limited to this. In other words, various modifications can be made to the above-described embodiments in terms of mechanism, shape, material, quantity, position, arrangement, etc. without departing from the scope of the technical idea and purpose of the present invention, and these modifications are included in the present invention. For example, the drain cover may be fixed directly to the drain or may be fixed to a drive member disposed in the drain pipe body of the drainage device. The cover and guide wall may be molded from plastic or metal. [Industrial Applicability]

[0151] INDUSTRIAL APPLICABILITY The present invention can be suitably used for a tank body system including a drain plug and a tank body with a drain plug for washing hands, etc. [Explanation of symbols]

[0152] 10 Washroom and hand-washing facilities 12 Drain cover 20 Covering Body 20a Plate section 20b Protrusion 20c tapered section 22 Guide Wall 24 Dispersion plane 26 Guide surface 26a First guide surface 26b Second guide surface 28 Base 28a Arc section 28A Curved interior 29 Lower base 29A Column interior 30 1st area 32 Second area 33 Internal guide 44A Internal fixation area 44a Columnar member 44b Mounting hole 23 Internal guide wall 34 Information Department 34a Top of guide 38 Upper space part 40 1st ridgeline area 42 Second ridgeline area 44 Fixed area 44c hole 48 Space section 48a 1st space part 48b 2nd space 49 Internal space 49a 1st internal space section 49b 2nd internal space part 14 Tank body 14a Upper opening 14b Lower opening 14c drain 50 Body 52 Drainage port of the vessel 54 Inner 56 bottom 58 Overflow hole 16 Drainage device (drainage pipe unit) 60 Drain pipe body 60a flange 60b male thread 60c Drain pipe outlet part 62 Lock nut 64 Sliding packing 66 Triangular packing 68 Sponge packing 70 Water pipe 72, 73, 76 Fixing nuts 74,75 Gasket 78 Trap 80 driving member 82 Cylinder 84 Support part 86 Operating member 88 Transmission member 18 Discharge device 200 Foreign matter removal section 200a Removal unit body 200b through hole 290 Discharge device body 292 Discharge port 294 Operation section

Claims

1. A drain cover configured to be attached to a drain outlet detachably or insertably and detachably, A cover that can cover the drain outlet in a plan view; A base portion that hangs down from the lower surface of the cover body, which is the drain outlet side, and whose outer surface guides water that has flowed into the tank body toward the drain outlet; a lower base portion formed from a lower end portion of the base portion downwardly so as to be connected to the base portion, and having an outer surface that allows water flowing in from the outer surface of the base portion to flow into a drain outlet; Equipped with The base portion has a generally inverted truncated cone shape in a front view and a generally annular shape in a plan view, The lower base portion has a columnar shape in a front view and a substantially annular shape in a plan view, The base portion has a guide wall disposed on its outer surface, The guide wall is provided to protrude from a region of the base close to the lower surface of the cover body, which is the surface of the cover body on the drain outlet side, so as to extend toward the periphery of the cover body and in a direction away from the cover body, and has a substantially rectangular shape when viewed from the front, The base is directly supported by the guide wall on the drain outlet, The base has, on the inner surface of its upper end, a curved interior formed in a curved shape in front view, which extends almost entirely upward toward the outside of the lower surface of the cover, and has, on the outer surface of its upper end, a curved portion formed in a curved surface that extends almost entirely upward toward the outside of the lower surface of the cover, which is arc-shaped or arc-shaped in front view, The base further includes an internal guide portion formed therein so as to protrude from the curved interior toward the central axis of the cover, The cover has a protrusion formed so as to hang down from its underside, and the internal guide portion is formed with an internal fixing region which is a connecting portion for fixing the base to the cover, and the cover and the base are connected via the internal guide portion by fitting the internal fixing region to the protrusion, the base and the lower base each have a cavity therein, the cavity being circular in plan view and formed into a cylindrical shape extending along the central axis of the cover, the cavity constituting a first internal space and a second internal space functioning as exhaust holes, An upper space portion, which is an exhaust hole, is formed between the lower surface of the cover body and the base, The upper space, the first internal space, and the second internal space are in communication with each other.

2. A drain cover as described in Claim 1, wherein the internal fixing area is formed from the side of the internal guide portion facing the central axis of the cover body toward the central axis of the cover body.

3. The cover body and the base are also connected via a guide upper portion, which is the upper portion of the guide wall, The lower surface of the cover body, which is the surface on the drain outlet side, has a smoothly tapered surface that gradually slopes from the outer peripheral edge of the cover body toward the center of the cover body toward the lower side, which is the drain outlet side, when viewed from the front, A drain cover as described in claim 1 or 2, wherein the upper guide portion has an upper end connected to a portion having an arc-shaped or circular arc-shaped front surface that curves circumferentially from the central axis of the lower surface of the cover body.

4. A tank body system in which the drain outlet cover according to any one of claims 1 to 3 is attached to a drain outlet.

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