drain trap

Abstract

To provide a drainage system capable of suppressing expansion of a space occupied by a drainage trap below a tank body such as a wash basin.SOLUTION: A drainage trap 1 disposed between a tank body unit 110 and a floor drainage pipe 140 for draining water from the tank body unit 110 comprises: a first sub-cylindrical body part 10; a second sub-cylindrical body part 20; a third sub-cylindrical body part 30; and a closing part 40, wherein the first sub-cylindrical body part forms, as a cylindrical part, a first internal space IS1 that has a substantially columnar outer shape and communicates with a tank body through an upper opening 11x, a second internal space IS2 that is formed around an outer periphery of the first internal space IS1 and communicates therewith, and a third internal space IS3 that is formed around an outer periphery of the second internal space IS2 and communicates with each of the second internal space IS2 and the floor drainage pipe 140.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention , washing Drainage system used in drainage systems with tanks such as face washers and hand basins trap Regarding. [Background technology]

[0002] Conventionally, drain traps are installed in the piping directly below the washbasin to prevent odors and gases rising from the drain pipe from leaking into the washbasin. Examples of such drain traps include siphon traps such as S-traps and P-traps, which are made up of a continuous, thin pipe that curves sharply in a direction approximately perpendicular to the extension direction of the piping, which is mainly parallel to the vertical direction, and the drainage water from the washbasin is accumulated as seal water in the curved part that convexly faces downward in the vertical direction (see, for example, Patent Document 1, Figure 1, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5452198 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional drain traps have the following problems: In the conventional drain traps, the pipe for accumulating the seal water is arranged with a certain extent in a space adjacent to the piping. This space is formed inside the vanity where the washbasin is installed, but this narrows the storage space of the vanity or leads to an increase in the size of the vanity.

[0005] In particular, in recent years, there has been an increase in floor drain pipes that are installed upright from the floor in facilities and equipment where washbasins and the like are installed, and if the above-mentioned conventional drain trap is to be adapted to such floor drain pipes, the routing of the piping for connecting the washbasin and floor drain pipe becomes complicated, further increasing the space occupied by the piping.

[0006] The present invention has been made in view of the above-mentioned problems, and provides a compact drainage truck that can suppress the expansion of the space occupied below a drainage system having a tank body such as a washbasin. P The purpose is to provide. [Means for solving the problem]

[0007] A first aspect of the present invention is a drain trap disposed between a tank body and a drain pipe extending from directly below the tank body toward the tank body and draining water from the tank body, the drain trap comprising a cylindrical body having a generally columnar outer shape and including a first internal space communicating with the tank body at a first communication position, a second internal space formed around the outer periphery of the first internal space and communicating with the first internal space, and a third internal space formed around the outer periphery of the second internal space and communicating with each of the second internal space and the drain pipe, the cylindrical body forming the first internal space and a part of the second internal space, and including a first sub-cylindrical body having a cylindrical first wall body with one open end communicating with the tank body and the other open end communicating with the second internal space, and forming the remaining part of the second internal space and a part of the third internal space; and a third sub-cylinder portion having a cylindrical second wall including a bottom surface facing the other open end of the first sub-cylinder portion and spaced apart from it, and an inner surface facing the outer surface of the first sub-cylinder portion and spaced apart from it, and a third sub-cylinder portion forming a remaining portion of the third internal space and having a cylindrical third wall including an inner surface facing the outer surface of the second sub-cylinder portion and spaced apart from it, wherein a second communication position where the first internal space communicates with the second internal space is below the first communication position, a third communication position where the second internal space communicates with the third internal space is above the second communication position, and a fourth communication position where the third internal space communicates with the drain pipe is below the second communication position, and the second communication position and the fourth communication position are Cylindrical body The third communicating position is located on the side facing the outer surface of the first sub-cylindrical portion, and the first wall is positioned on the innermost periphery of the cylindrical portion, the third wall and a part of the second wall are positioned on the outermost periphery of the cylindrical portion, and the remaining part of the second wall is positioned on the Cylindrical body The fourth communication position is a drain trap formed in the second sub-cylindrical portion, and the fourth communication position is a drain trap formed in the second sub-cylindrical portion. [Effects of the Invention]

[0018] The present invention as described above has the effect of making it possible to prevent the drain trap from occupying too much space below a tank body such as a washbasin.

[0019] 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]

[0020] [Figure 1] FIG. 1 is an exploded front view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention. [Figure 2] FIG. 1 is an exploded perspective view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention; [Figure 3] FIG. 1 is a front cross-sectional view of a main part showing the configuration of a drain trap according to an embodiment of the present invention. [Figure 4] FIG. 1 is an exploded perspective view showing the configuration of a drain trap according to an embodiment of the present invention; [Figure 5] Cross section along line AA in Figure 4 [Figure 6] Cross section along line BB in Figure 4 [Figure 7] Cross section along line CC in Figure 4 [Figure 8] Cross section along line DD in Figure 4 [Figure 9] (A) A front view of a cross-sectional view of a main part showing the configuration of a first sub-cylinder portion 10 of a drain trap according to an embodiment of the present invention. (B) A cross-sectional view taken along line EE in FIG. 9(A). [Figure 10] FIG. 2 is a cross-sectional front view of a main portion showing the configuration of the second sub-cylindrical portion 20 of the drain trap according to the embodiment of the present invention. [Figure 11] (A) A cross-sectional view taken along line FF in FIG. 10. (B) A cross-sectional view taken along line GG in FIG. 10. (C) A plan view showing the configuration of the second sub-cylindrical portion 20 of the drain trap according to the embodiment of the present invention. [Figure 12](A) A plan view showing the configuration of the O-ring retainer 50 of the drain trap according to the embodiment of the present invention. (B) A cross-sectional view of the main part from the front showing the configuration of the O-ring retainer 50 of the drain trap according to the embodiment of the present invention. [Figure 13] (A) A front view of a cross-sectional view of a main part showing the configuration of the third sub-cylinder portion 30 of the drain trap according to the embodiment of the present invention. (B) A cross-sectional view taken along line HH in FIG. 13. [Figure 14] (A) A plan view showing the configuration of the blocking portion 40 of the drain trap according to the embodiment of the present invention. (B) A bottom view showing the configuration of the blocking portion 40 of the drain trap according to the embodiment of the present invention. (C) A cross-sectional view of the main part from the front showing the configuration of the blocking portion 40 of the drain trap according to the embodiment of the present invention. [Figure 15] (A) A plan view showing the configuration of the drain trap cap 60 according to an embodiment of the present invention. (B) A front cross-sectional view of the main part showing the configuration of the drain trap cap 60 according to an embodiment of the present invention. [Figure 16] FIG. 1 is a diagram illustrating the operation of a drain trap according to an embodiment of the present invention. [Figure 17] (A) A front view of a cross-sectional view of a main part showing another example of the configuration of the first sub-cylinder portion 10 of the drain trap according to the embodiment of the present invention. (B) A plan view showing another example of the configuration of the first sub-cylinder portion 10 of the drain trap according to the embodiment of the present invention. [Figure 18] FIG. 1 is a perspective view showing a schematic configuration of a washbasin / hand-washing facility 200 using a drainage system having a drain trap according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0021] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0022] (Drainage system) Figure 1 is an exploded front view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention, and Figure 2 is an exploded perspective view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention.

[0023] As shown in the drawings, a drainage system 100 having a drain trap according to an embodiment of the present invention comprises a tank body unit 110 and a drain trap 1 as its main components.

[0024] The tank body unit 110 has a tank body 111, which may be a washbasin or a hand washing basin, for example, and a pipe body 112 attached to an opening 111x of the tank body 111 as main components.

[0025] The pipe body 112 is a substantially cylindrical member having a drain port 112x at one open end exposed to the inside of the tank body 111, and an opening 112y at the other open end and tip end, which is on the tip end side of the tip portion 112a and is connected to the drain trap 1. A male thread 112b is formed on the outer circumferential surface of the pipe body 112 on the drain port 112x side.

[0026] The pipe 112 is inserted into the opening 111x from inside the tank body 111 via a sponge packing 113. A triangular packing 114 and a sliding packing 115 are fitted into the part of the pipe 112 exposed to the outside of the tank body 111, starting from the side closest to the tank body 111. Finally, the pipe 112 is fixed to the tank body 111 by screwing a lock nut 116 having a female thread 116a formed on the inside of the male thread 112b of the pipe 112.

[0027] The drain trap 1 is a means for connecting the tank body unit 110 to a floor drain pipe 140 that protrudes from the floor on which the washbasin is placed.

[0028] The drain trap 1 has a generally cylindrical outer shape formed to be rotationally symmetric about a central axis CA shared by the tank unit 110, including the opening 111x of the tank body 111 and the pipe body 112, the installation hole 130x of the base 130 (described later), and the floor drain pipe 140. The drain trap 1 also has three cylinders, namely, a first sub-cylinder portion 10, a second sub-cylinder portion 20, and a third sub-cylinder portion 30, each having a generally cylindrical outer shape that is rotationally symmetric about the central axis CA, and a blocking portion 40. When viewed from the central axis CA side, the first sub-cylinder portion 10 forms the innermost circumference of the drain trap 1, a portion of the second sub-cylinder portion 20 and the third sub-cylinder portion 30 form the outermost circumference, and the remaining portion of the second sub-cylinder portion 20 forms the circumference between the first sub-cylinder portion 10 and the third sub-cylinder portion 30, and are arranged concentrically. As a result, the drain trap 1 has a roughly triple-cylindrical configuration.

[0029] 1, the second sub-cylinder portion 20 has an upper opening 23x at one end side facing the tank body unit 110, and the tank body unit 110 is inserted from the upper opening 23x side. A gap G between the first sub-cylinder portion 10 and the second sub-cylinder portion 20 is located deep inside the upper opening 23x, and the tip portion 112a of the pipe body 112 of the tank body unit 110 is fitted into the gap G, whereby the tank body unit 110 is detachably fixed to the drain trap 1.

[0030] Furthermore, the drain trap 1 has an outer diameter large enough to be inserted freely into an installation hole 130x, which is a through-hole formed on the base 130 of the vanity on which the tank body unit 110 is mounted, and is provided with a flange 25 that is formed to expand in the circumferential direction from a plane that is approximately horizontal to the upper opening 23x. The outer diameter of the flange 25 is larger than that of the installation hole 130x, so that the drain trap 1 inserted into the installation hole 130x from the side on which the tank body unit 110 is mounted is fixed on the base 130 so as to be insertable and removable with the flange 25 engaged with the periphery of the installation hole 130x.

[0031] Furthermore, the drain trap 1 has the lower cylinder body portion 22, which is the other end side relative to the upper opening 23x, connected to the floor drain pipe 140 by screwing on the cap 60. As a result, the tank body unit 110 and the floor drain pipe 140 are connected via the drain trap 1 in the middle, and the drain outlet 112x is placed in communication with the floor drain pipe 140, completing the drainage system 100. In the tank body unit 110, the drain outlet 112x is covered by the drain outlet cover 120, which is an independent, detachable part, when viewed in the direction of the central axis CA, and is closed in a state in which it can communicate with the pipe body 112.

[0032] Here, in the following description of the present invention, based on the above explanation, directions will be defined as follows when referring to each drawing. That is, the direction along the central axis CA in Figures 1 and 2 is defined as the up-down direction, the side where the tank unit 110 is located is defined as the upside, and the side where the floor drain pipe 140 is located is defined as the downside. Furthermore, the right-hand side of the plane of Figure 1 is defined as the right side, and the left-hand side is defined as the left side, and the direction connecting these is defined as the left-right direction. Furthermore, the direction perpendicular to the up-down and left-right directions is defined as the front-to-back direction, and the direction toward the front of the plane of Figure 1 is defined as the front, and the direction toward the back is defined as the rear. Each direction is indicated by a Cartesian coordinate system shown in each figure, and the following description will refer to the coordinate system shown in the figures as appropriate.

[0033] (Outline of drain trap 1) The drain trap 1 of the embodiment of the present invention has an upper opening 23x connected to the tank body unit 110 as its upper opening end in the drainage system 100, and a lower opening 22y connected to the floor drain pipe 140 as its lower opening end, and directs drainage water from the tank body 111 to the floor drain pipe 140 while preventing odors and gases from the floor drain pipe 140 side from being directed to the tank body unit 110.

[0034] Fig. 3 is a front cross-sectional view of a main part showing the configuration of a drain trap according to an embodiment of the present invention, and Fig. 4 is an exploded perspective view showing the configuration of a drain trap according to this embodiment. The following description will be given with reference to Figs. 3 and 4, as well as other drawings as necessary.

[0035] As described above, the drain trap 1 has three cylindrical bodies, namely, the first sub-cylindrical body section 10, the second sub-cylindrical body section 20, and the third sub-cylindrical body section 30, each of which has an approximately cylindrical outer shape and is rotationally symmetric around the central axis CA and arranged concentrically when viewed from above, as well as a blocking section 40.

[0036] The first sub-cylinder portion 10 is a member located on the innermost side of the drain trap 1 and directly communicating with the pipe 112 of the tank body unit 110. The second sub-cylinder portion 20 houses the first sub-cylinder portion 10 therein and is connected to each of the tank body unit 110 and the floor drain pipe 140, and is a member that constitutes part of the exterior of the drain trap 1. The third sub-cylinder portion 30 is a member that covers part of the second sub-cylinder portion 20 from the outside and constitutes the remaining part of the exterior of the drain trap 1. The closure portion 40 is a member that assembles the second sub-cylinder portion 20 and the third sub-cylinder portion 30 together and constitutes part of the exterior of the drain trap 1.

[0037] The drain trap 1 functions as a drain trap, which will be described later, by combining the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, and the blocking portion 40. Each of the sub-cylinders and other components will be described below.

[0038] (First sub-cylinder portion 10) The first sub-cylinder portion 10 has a cylindrical main body portion 11 that is a member made of a synthetic resin such as polypropylene or rigid polyvinyl chloride. As shown in Figure 4 and Figures 9(A) and (B) in particular, the cylindrical main body portion 11 has side walls that form the inner and outer circumferential surfaces, as well as upper openings 11x that are open ends on the upper side of the bottom surface at both ends and bottoms 11c that form closed ends on the lower side of the bottom surface at both ends, thereby forming a closed tubular outer shape.

[0039] Furthermore, the cylindrical main body 11 has a pair of slits 11y formed by cutting through both the left and right sides of the side wall along the periphery of the bottom 11c from the outer peripheral surface 11a to the inner peripheral surface 11b. Due to the formation of the pair of slits 11y, the remaining portions of the side wall circumferentially adjacent to the pair of slits 11y form a pair of legs 11d arranged in the front-to-rear direction. This allows the intra-cylinder space 10x of the first sub-cylinder 10 to be in communication with the outside via the upper opening 11x at the top and the pair of slits 11y at the bottom.

[0040] Furthermore, a groove 11w having an annular shape in top view is formed on the outer peripheral surface 11a of the side wall adjacent to the upper opening 11x of the cylindrical body 11. As shown in Figures 3 and 4, a packing P3 is attached to the groove 11w. Furthermore, a mounting hole 11z, which is a through hole, is provided in the center of the bottom 11c of the cylindrical body 11.

[0041] (Second sub-cylindrical portion 20) The second sub-cylinder portion 20 has a configuration in which a central cylinder main body portion 21, a lower cylinder main body portion 22 located below the central cylinder main body portion 21, an upper cylinder main body portion 23 located above the central cylinder main body portion 21, a boundary cylinder main body portion 24 located between the central cylinder main body portion 21 and the upper cylinder main body portion 23, and a flange 25 surrounding the outer periphery of the upper cylinder main body portion 23 are integrally formed by means of casting or the like. In other words, in the second sub-cylinder portion 20, the central cylinder main body portion 21, the lower cylinder main body portion 22, the upper cylinder main body portion 23, the boundary cylinder main body portion 24, and the flange 25 are each formed as parts located at different positions on a single member.

[0042] (Central cylinder body part 21) As shown particularly in Figures 4, 10 and 11(A), the central cylindrical main body portion 21 is located approximately in the center of the second sub-cylindrical portion 20, and is a portion that is separated from other portions by the continuous outer surface 21a having the same outer diameter.

[0043] The central cylindrical body portion 21 has side walls that function as walls that form the inner and outer peripheral surfaces, as well as a bottom 21c that forms an open end at the top that communicates with an upper opening 23x and a lower opening 23y, which are the open ends of the upper cylindrical body portion 23 described later, and a closed end at the bottom, thereby forming a closed tubular outer shape.

[0044] Furthermore, central cylinder main body 21 has a pair of slits 21x formed by cutting through both the left and right sides of the upper side wall from outer peripheral surface 21a to inner peripheral surface 21b. As a result of the formation of the pair of slits 21x, the remaining parts of the side walls circumferentially adjacent to the pair of slits 21x form a pair of legs 21e arranged in the front-rear direction.

[0045] As a result, the cylindrical space 20x of the second sub-cylindrical portion 20 is in communication with the outside via the upper opening 23x and lower opening 23y of the upper cylindrical main body portion 23 and the pair of slits 21x, respectively.

[0046] Furthermore, the central cylindrical main body portion 21 has a convex end 21f that protrudes downward along the central axis CA from the center of the outer surface 21d of the bottom 21c, and an attachment hole 21z, which is a non-through hole that opens at the center of the concave surface 21y, is provided inside the convex end 21f.

[0047] (Lower cylinder body part 22) 4, 10, and 11(B), the lower cylinder body portion 22 is a portion located below the central cylinder body portion 21, i.e., at the lower end of the second sub-cylinder portion 20. The lower cylinder body portion 22 is a component that performs the function of a drain trap in combination with the first sub-cylinder portion 10, the third sub-cylinder portion 30, and the blocking portion 40, and is also a portion used to connect the floor drain pipe 140 and the drain trap 1.

[0048] The lower cylindrical body main body 22 has side walls that form the inner and outer peripheral surfaces, as well as an upper opening 22x that is an open end on the upper side of the bottom surface at both ends, and a lower opening 22y that is an open end on the lower side of the bottom surface at both ends, thereby forming a cylindrical outer shape with both upper and lower ends connected.

[0049] The lower cylinder body portion 22 has an outer peripheral surface 22a whose outer diameter is smaller than that of the outer peripheral surface 21a of the central cylinder body portion 21, and an outer peripheral surface 22c located above the outer peripheral surface 22a and whose outer diameter is approximately the same as that of the outer peripheral surface 21a of the central cylinder body portion 21. The boundary between the outer peripheral surfaces 21a and 22c may be formed by a continuous change in the outer diameter due to a tapered surface as shown in the figure, or may be formed by an intermittent change in the outer diameter due to a step.

[0050] Furthermore, upper opening 22x has a smaller inner diameter than lower opening 22y in lower cylinder main body portion 22. Specifically, inner circumferential surface 22d, which has the same inner diameter as upper opening 22x, changes gradually to inner circumferential surface 22b, which includes intermediate opening 22w and has a smaller inner diameter, at edge portion 22z, which is annular in top view and located approximately on the boundary between outer circumferential surfaces 22a and 22c.

[0051] Furthermore, a male thread 22e is formed on the upper end side of the outer peripheral surface 21a of the lower cylindrical body main body 22. Similarly, a male thread 22f is formed on the lower end side of the outer peripheral surface 22a. The male thread 22e has a larger outer diameter than the male thread 22f, and therefore the lower cylindrical body main body 22 has an outer shape that tapers slightly in stages.

[0052] Furthermore, in the lower cylinder body main body portion 22, a pair of legs 22g arranged in the front-rear direction extend upward from the periphery of the upper opening 22x, reaching and being integrated with the outer surface 21d of the bottom 21c of the central cylinder body main body portion 21. Due to the presence of the pair of legs 22g, the boundary between the central cylinder body main body portion 21 and the lower cylinder body main body portion 22, which are adjacent in the circumferential direction of the pair of legs 22g, forms gaps 22h arranged in the left-right direction.

[0053] Gap 22h is in communication with upper opening 22x. As a result, second sub-cylinder portion 20 has a configuration in which gap 22h located on the outer circumferential side of the boundary between central cylinder main body portion 21 and lower cylinder main body portion 22 is in communication with lower opening 22y through the intra-cylinder space of lower cylinder main body portion 22.

[0054] (Upper cylinder body part 23) 4, 10, and 11(C), the upper cylinder body portion 23 is a portion located above the central cylinder body portion 21, i.e., at the upper end of the second sub-cylinder body portion 20. The upper cylinder body portion 23 is a component that functions as a drain trap in combination with the first sub-cylinder body portion 10 and the third sub-cylinder body portion 30, and is also a portion that is used to connect the tank body unit 110 and the drain trap 1 in combination with the first sub-cylinder body portion 10.

[0055] The upper cylindrical body portion 23 has side walls that form the inner and outer peripheral surfaces, as well as upper openings 23x that are open ends on the upper side of the bottom surfaces at both ends, and lower openings 23y that are open ends on the lower side of the bottom surfaces at both ends, thereby forming a cylindrical outer shape that connects the intra-cylindrical space 23w at both the upper and lower ends.

[0056] The upper cylinder body portion 23 has an outer peripheral surface 23a whose outer diameter is larger than the outer peripheral surface 21a of the central cylinder body portion 21 and the outer peripheral surfaces 24a and 24b of the boundary cylinder body portion 24 described below. As a result, the upper cylinder body portion 23 has an annular edge portion 23b formed at the boundary with the boundary cylinder body portion 24 in a top view.

[0057] Furthermore, the inner diameter of the intra-cylinder space 23w of the upper cylinder main body portion 23 gradually decreases downward. Specifically, the inner circumferential surface, which has the same inner diameter as the upper opening 23x, changes to an inner circumferential surface 24e with a smaller inner diameter at a lower annular edge portion 23c in a top view. Furthermore, the inner circumferential surface, which has the same inner diameter as the edge portion 23c, changes to an inner circumferential surface 24f with an even smaller inner diameter at a lower annular edge portion 23d in a top view. Furthermore, the inner circumferential surface, which has the same inner diameter as the edge portion 23d, changes to an inner circumferential surface with an even smaller inner diameter that continues to the inner circumferential surface of the boundary cylinder main body portion 24 (described later) and the inner circumferential surface 21b of the central cylinder main body portion 21, at a lower annular edge portion 23e in a top view.

[0058] 10, the inner diameter of the edge 23e and the diameter of the inner peripheral surface below it are equal to the diameter of the inner peripheral surface 21b of the central cylinder main body portion 21. As a result, the boundary cylinder main body portion 24 and the central cylinder main body portion 21 have a configuration in which they have inner peripheral surfaces with a diameter equal to the inner peripheral surface 21b of the central cylinder main body portion 21.

[0059] Furthermore, in the upper cylinder body portion 23, as shown particularly in FIG. 11(C), a plurality of non-through holes, ie, mounting holes 23z, are provided at predetermined intervals on the edge portion 23d.

[0060] (Boundary cylinder body part 24) The boundary cylinder main body portion 24 is a portion located between the central cylinder main body portion 21 and the upper cylinder main body portion 23 in the vertical direction, as shown particularly in Figures 3, 4, and 10, and is a portion used to combine the second sub-cylinder portion 20 with the third sub-cylinder portion 30 described later.

[0061] 10, in addition to side walls that serve as walls that form the inner and outer circumferential surfaces, the boundary cylinder main body 24 has inner circumferential surfaces 24f on the upper side of the bottom surface at both ends that continue from the edge 23d of the upper cylinder main body 23, and the lower side of the bottom surface at both ends that have inner circumferential surfaces of the same diameter that continue from the inner circumferential surface 21b of the central cylinder main body 21, thereby forming a cylindrical outer shape that is continuous at both the upper and lower ends. Note that in the lower cylinder main body 22, the inner circumferential surface 24f extending from the upper end and the inner circumferential surface extending from the lower end are separated by the edge 23e, with the inner circumferential surface 24f having a larger inner diameter.

[0062] Furthermore, grooves 24x and 24y, which are annular in top view, are formed vertically spaced apart on the outer circumferential surface of the side wall of the boundary cylinder main body 24. In addition, with the formation of grooves 24x and 24y, the outer circumferential surfaces of the side wall adjacent to grooves 24x and 24y in the central axis direction constitute outer circumferential surfaces 24a and 24b arranged vertically spaced apart.

[0063] The groove 24x is formed between the outer peripheral surface 23a of the upper cylinder body portion 23 and the outer peripheral surface 24a of the boundary cylinder body portion 24. The groove 24y is formed between the outer peripheral surface 24a and the outer peripheral surface 24b of the boundary cylinder body portion 24. As shown in Figures 3 and 4, a packing P1 is attached to the groove 24y.

[0064] Furthermore, in the boundary cylinder main body portion 24, the diameters of the outer peripheral surfaces 24a and 24b are each smaller than the diameter of the outer peripheral surface 23a of the upper cylinder main body portion 23.

[0065] Furthermore, the outer diameter of the outer peripheral surface 24b of the boundary cylinder main body portion 24 is larger than that of the outer peripheral surface 21a of the central cylinder main body portion 21. As a result, the boundary cylinder main body portion 24 has an annular edge portion 24d formed at the boundary with the boundary cylinder main body portion 24 in top view.

[0066] (Flange 25) As shown in Figures 10 and 11(C), the flange 25 is located on approximately the same plane as the upper opening 23x of the upper cylinder main body portion 23 and has an isotropic extension along the radial direction of the upper opening 23x, and is a portion for arranging the drain trap 1 on the base 130 of the washbasin, etc.

[0067] As described above, the outer diameter of the flange 25 is larger than that of the installation hole 130x. As a result, the drain trap 1 inserted into the installation hole 130x from the side where the tank body unit 110 is installed is fixed so as to be freely insertable and removable on the base 130 with the flange 25 locked onto the periphery of the installation hole 130x.

[0068] (Third sub-cylinder portion 30) As shown particularly in Figures 3 and 4, the third sub-cylinder portion 30 is a component that is located between the upper cylinder main body portion 23 and the lower cylinder main body portion 22 of the second sub-cylinder portion 20 in the vertical direction, and is located on the outer periphery of the central cylinder main body portion 21 of the second sub-cylinder portion 20 when viewed from above, and together with the lower cylinder main body portion 22 and the upper cylinder main body portion 23 of the second sub-cylinder portion 20, is a component that constitutes the exterior of the drain trap 1.

[0069] The third sub-cylinder portion 30 has a cylindrical main body portion 31, which is a member made of a synthetic resin such as polypropylene or rigid polyvinyl chloride. As shown in particular in Figure 4 and Figures 13(A) and (B), in addition to side walls that form the inner and outer circumferential surfaces, the cylindrical main body portion 31 has upper openings 31x that are open ends on the upper side of the bottom surface at both ends and lower openings 31y that are open ends on the lower side of the bottom surface at both ends, thereby forming a cylindrical outer shape in which both the upper and lower ends are connected. The outer circumferential surfaces 31a of the side walls of the third sub-cylinder portion 30 form the exterior of the drain trap 1.

[0070] (Occluded part 40) 3 and 4 , the closure portion 40 is a member that is disposed across the lower end of the third sub-cylinder portion 30 and the upper end of the lower cylinder main body portion 22 of the second sub-cylinder portion 20 when viewed in the front-rear or left-right direction, and that is disposed across the inner circumferential surface of the third sub-cylinder portion 30 and the outer circumferential surface of the lower cylinder main body portion 22 of the second sub-cylinder portion 20 when viewed from above. Furthermore, as described above, the closure portion 40 is a member that is used to integrally assemble the second sub-cylinder portion 20 and the third sub-cylinder portion 30, and is a member that constitutes the exterior of the drain trap 1 together with the lower cylinder main body portion 22 and the upper cylinder main body portion 23 of the second sub-cylinder portion 20.

[0071] The closure 40 has a closure main body 41, which is a member made of synthetic resin such as polypropylene or hard polyvinyl chloride. As shown in Figures 14(A), (B), and (C) in particular, the closure main body 41 forms a substantially annular outer shape that communicates from the upper opening 40x to the lower opening 40y.

[0072] A flange portion 42 is formed by spreading out isotropically in the radial direction from the vertical central portion of the closure main body 41. A groove 41a having an annular shape in top view is formed on the outer peripheral surface of the closure main body 41. Furthermore, a nut portion 43 having a substantially hexagonal outer shape in top view is formed in the portion of the closure main body 41 below the flange portion 42.

[0073] Furthermore, in the closure portion 40, an annular groove 41c is formed on the inner circumferential surfaces 41b of the closure main body 41 and the flange portion 42 in a top view. Also, a female thread 43a is formed on the inner circumferential surface of the nut portion 43. As shown in Figures 3 and 4, a packing P4 is fitted in the groove 41a, and a packing P5 is fitted in the groove 41c.

[0074] (Drain trap 1) The configuration of the drain trap 1 of this embodiment, which is a combination of the first sub-cylindrical portion 10, the second sub-cylindrical portion 20, the third sub-cylindrical portion 30 and the blocking portion 40 described above, is as follows.

[0075] First, the first sub-cylinder portion 10 and the second sub-cylinder portion 20 are assembled as follows: That is, as shown in Figures 3 and 4, the first sub-cylinder portion 10 is inserted into the central cylinder main body portion 21 through the upper opening 23x of the upper cylinder main body portion 23 of the second sub-cylinder portion 20, and the bottom 11c fits into the concave surface 21y of the central cylinder main body portion 21, thereby positioning the first sub-cylinder portion 10 with respect to the second sub-cylinder portion 20.

[0076] Then, the fixing screw S1 inserted from the upper opening 11x of the first sub-cylinder portion 10 is screwed into the mounting hole 21z of the central cylinder main body portion 21 of the second sub-cylinder portion 20 through the mounting hole 11z in the bottom 11c of the first sub-cylinder portion 10. As a result, the first sub-cylinder portion 10 is fixed to the second sub-cylinder portion 20 in a coaxial arrangement sharing the central axis CA.

[0077] Next, the second sub-cylinder portion 20, the third sub-cylinder portion 30, and the closing portion 40 are combined as follows: That is, as shown in Figures 3 and 4, the third sub-cylinder portion 30 is entirely inserted into the second sub-cylinder portion 20 from below, with the upper opening 31x facing the lower cylinder main body portion 22 of the second sub-cylinder portion 20.

[0078] As shown particularly in Figure 3, the third sub-cylinder portion 30 is positioned relative to the second sub-cylinder portion 20 by having the upper opening 31x fitted into the outer peripheral surfaces 24a and 24b of the boundary cylinder main body portion 24 and being engaged in the vertical direction by the edge portion 23b.

[0079] Then, with respect to the second sub-cylinder portion 20 on which the third sub-cylinder portion 30 has been positioned, the closing portion 40 is entirely inserted into the lower cylinder body main body portion 22 from below, with the upper opening 40x facing the lower cylinder body main body portion 22 of the second sub-cylinder portion 20. Furthermore, the female threads 43a on the inner peripheral surface of the closing portion 40 are screwed into the male threads 22e of the lower cylinder body main body portion 22 based on an external operation on the nut portion 43. As a result, the third sub-cylinder portion 30 is fixed to the second sub-cylinder portion 20 in a coaxial arrangement sharing a common central axis CA, with the upper opening 31x closed by the upper cylinder body main body portion 23 and the lower opening 31y closed by the lower cylinder body main body portion 22 and the closing portion 40.

[0080] 3 and 4, an O-ring holder 50 is attached with an O-ring O1 interposed between edge portions 23d and 23e of upper cylinder body portion 23 of second sub-cylinder portion 20. As shown in FIGS. 12(A) and 12(B), O-ring holder 50 is configured by integrally molding an annular ring body portion 51 having an opening 50x, which is a member made of synthetic resin such as polypropylene or rigid polyvinyl chloride, and a flange portion 52 formed by expanding in the circumferential direction from a plane substantially horizontal to the upper end side of opening 50x.

[0081] A plurality of mounting holes 52x, which are through holes, are provided on the flange portion 52 at predetermined intervals so as to be arranged corresponding to the positions of each of the plurality of mounting holes 23z of the upper cylindrical main body portion 23 of the second sub-cylindrical portion 20.

[0082] The O-ring holder 50 is fixed to the second sub-cylinder portion 20 by threading a fixing screw S2 into each of the multiple mounting holes 23z of the upper cylinder main body portion 23 through each of the multiple mounting holes 52x of the flange portion 52.

[0083] A cap 60 is used to connect the drain trap 1 and the floor drain pipe 140. As shown in FIGS. 15(A) and 15(B), the cap 60 includes an annular cap body 61 made of a synthetic resin such as polypropylene or rigid polyvinyl chloride, and having an upper opening 60x and a lower opening 60y. The lower opening 60y has a smaller inner diameter than the upper opening 60x because the cap body 61 has an annular edge 61b in top view that extends toward the central axis from the inner circumferential surface of the cap body 61, which is substantially flush with the lower opening 60y. A gasket P6 is attached to the edge 61b.

[0084] Furthermore, a female thread 61a is formed on the entire inner circumferential surface of the cap main body 61. The cap 60 is threadedly engaged with the male thread 22f of the lower cylinder main body 22 of the second sub-cylinder portion 20 by the female thread 61a.

[0085] As shown in FIG. 3 , the gap between the upper cylindrical body 23 of the second sub-cylinder 20 and the third sub-cylinder 30 is maintained airtight and watertight by the interposition of a gasket P1. Similarly, the gap between the third sub-cylinder 30 and the closing section 40 is maintained airtight and watertight by the interposition of a gasket P4. Similarly, the gap between the lower cylindrical body 22 of the second sub-cylinder 20 and the closing section 40 is maintained airtight and watertight by the interposition of a gasket P5. Similarly, as shown in FIGS. 1 and 3 , the gap between the tank unit 110 and the drain trap 1 is maintained airtight and watertight by the interposition of an O-ring O1 and a gasket P3. Similarly, the gap between the drain trap 1 and the floor drain pipe 140 is maintained airtight and watertight by the interposition of a gasket P6.

[0086] The drain trap 1 is attached to the tank unit 110 and the floor drain pipe 140 in the drainage system 100 as follows. As shown in Figures 1 and 2, the drain trap 1 inserted into the installation hole 130x of the sink base 130 is placed facing the floor drain pipe 140, which extends directly upward from the floor surface (not shown), along the central axis CA. The cap 60 is inserted into the floor drain pipe 140 or the lower cylinder main body portion 22 of the second sub-cylinder portion 20 of the drain trap 1 in advance.

[0087] In the above state, the lower opening 22y of the lower cylindrical body 22 of the second sub-cylindrical part 20 is fitted into the floor drain pipe 140 and engaged at the edge 22z to temporarily fix it. Next, the cap 60 is screwed onto the lower cylindrical body 22 and fastened to the floor drain pipe 140, so that the drain trap 1 is fixed to the floor drain pipe 140 and connected as a drainage path continuing to the floor drain pipe 14.

[0088] On the other hand, the drain trap 1 disposed on the base 130 of the washbasin has an upper opening 23x of the upper cylinder main body 23 of the second sub-cylinder portion 20 exposed. Therefore, as described above, by inserting the tip portion 112a of the pipe 112 of the tank body unit 110 into the upper opening 23x and fitting it into the gap G between the first sub-cylinder portion 10 and the second sub-cylinder portion 20, which is annular in top view and located below the upper opening 23x, the tank body unit 110 is fixed to the drain trap 1 and connected as a drainage path leading to the drain trap 1. A synthetic resin O-ring retainer 50 is interposed between the tank body 111 of the tank body unit 110 and the second sub-cylinder portion 20, thereby reducing the risk of damage to the tank body 111 when the tank body unit 110 is detached or used.

[0089] The series of steps for assembling the drain trap 1 to the tank body unit 110 and the floor drain pipe 140 described above corresponds to an embodiment of the drainage system construction method of the present invention.

[0090] In the drain trap 1 of this embodiment, in which the various components are combined as described above, the drain path from the tank unit 110 side, which is upstream of the drainage, to the floor drain pipe 140, which is downstream, is formed as follows.

[0091] 3, 5, 6, and 16, the drain trap 1 is connected to the intra-cylinder space 10x of the first sub-cylinder portion 10 via, in order from upstream, the opening 50x of the O-ring holder 50, the upper opening 23x and the lower opening 23y of the upper cylinder main body portion 23 of the second sub-cylinder portion 20, and the upper opening 11x of the first sub-cylinder portion 10. Here, the intra-cylinder space 10x of the first sub-cylinder portion 10 forms a first internal space IS1 in the drain trap 1. The first internal space IS1 is a space having a generally columnar outer shape that is formed rotationally symmetrically about the central axis CA when viewed in the up-down direction.

[0092] Next, as shown particularly in Figures 1, 3, 5 to 7, and 16, the space surrounded by the outer peripheral surface 11a of the first sub-cylinder portion 10 and the inner peripheral surface 21b of the central cylindrical main body portion 21 of the second sub-cylinder portion 20 in a top view, and surrounded by the bottom 21c of the central cylindrical main body portion 21 of the second sub-cylinder portion 20 and the tank unit 110 in a left-right or front-back view, forms the second internal space IS2 in the drain trap 1. The second internal space IS2 is a space formed around the outer periphery of the first internal space IS1 and has an outer ring shape in a vertical view.

[0093] 3, 5 to 8, and 16, the space surrounded by the outer peripheral surface 21a of the central cylindrical body portion 21 of the second sub-cylindrical body portion 20 and the inner peripheral surface 31b of the third sub-cylindrical body portion 30 in a top view, and surrounded by the edge portion 24d of the boundary cylindrical body portion 24 of the second sub-cylindrical body portion 20 and the lower cylindrical body portion 22 and the closing portion 40 of the second sub-cylindrical body portion 20 in a left-right or front-back view, forms a third internal space IS3 in the drain trap 1. The third internal space IS3 is a space that is formed around the outer periphery of the second internal space IS2 and has an outer ring shape in a vertical view.

[0094] As shown in Figures 3 and 5, the first internal space IS1 and the second internal space IS2 communicate with each other via a pair of slits 11y in the first sub-cylinder portion 10. As shown in Figures 3 and 5, the second internal space IS2 and the third internal space IS3 communicate with each other via a pair of slits 21x in the central cylinder main body portion 21 of the second sub-cylinder portion 20. The third internal space IS3 communicates with the lower opening 22y of the lower cylinder main body portion 22 of the second sub-cylinder portion 20 via a gap 22h at the boundary between the central cylinder main body portion 21 and the lower cylinder main body portion 22, as shown in Figures 3 and 8.

[0095] Here, as shown in Figure 3, a pair of slits 11y of the first sub-cylinder portion 10, which are communication positions between the first internal space IS1 and the second internal space IS2, are located below the upper opening 11x, which is communication position between the tank body unit 110 and the first sub-cylinder portion 10.

[0096] Furthermore, a pair of slits 21x in the central cylindrical main body portion 21 of the second sub-cylindrical portion 20, which are communication positions between the second internal space IS2 and the third internal space IS3, are located above a pair of slits 11y in the first sub-cylindrical portion 10, which are communication positions between the first internal space IS1 and the second internal space IS2.

[0097] Furthermore, the gap 22h at the boundary between the central cylinder main body portion 21 and the lower cylinder main body portion 22, which is the communication position between the third internal space IS3 and the lower opening 22y of the lower cylinder main body portion 22 of the second sub-cylinder portion 20, is located below a pair of slits 21x in the central cylinder main body portion 21 of the second sub-cylinder portion 20, which is the communication position between the second internal space IS2 and the third internal space IS3.

[0098] In the above description, the drain trap 1 corresponds to the drain trap of the present invention. The first sub-cylinder portion 10 corresponds to the first sub-cylinder of the present invention, the second sub-cylinder portion 20 corresponds to the second sub-cylinder of the present invention, and the third sub-cylinder portion 30 corresponds to the third sub-cylinder of the present invention. Furthermore, the combination of the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, and the blocking portion 40 corresponds to the cylinder portion of the present invention. Furthermore, the tank body unit 110 corresponds to the tank body of the present invention, and the floor drain pipe 140 corresponds to the drain pipe of the present invention.

[0099] The drain trap 1 of the embodiment having the above-described configuration functions as a bottle trap by forming a first internal space IS1 to a third internal space IS3 arranged concentrically on the drainage path from the tank body unit 110 side, which is upstream of the drainage, to the floor drain pipe 140, which is downstream.

[0100] The drainage state of the drain trap 1 incorporated in the drainage system 100 of this embodiment will be described below with reference to Figures 3, 5 to 8, and 16. Note that the black arrows in the above figures indicate the direction in which drainage water moves from the tank body unit 110.

[0101] When wastewater from the pipe body 112 of the tank body unit 110 enters the intra-cylindrical space 10x of the first sub-cylindrical portion 10, i.e., the first internal space IS1, through the upper opening 11x directly connected to the pipe body 112, it is discharged through a pair of slits 11y in the first sub-cylindrical portion 10 and accumulates in the second internal space IS2 as sealing water SW, shown by the cross-hatching in Figure 16.

[0102] When the water level of the seal water SW accumulated in the second internal space IS2 reaches the pair of slits 21x in the central cylindrical main body 21 of the second sub-cylinder portion 20 and overflows, the excess drainage water generated by the overflow leaks from the pair of slits 21x into the third internal space IS3, passes through the gap 22h at the boundary between the central cylindrical main body 21 and the lower cylindrical main body 22 in the second sub-cylinder portion 20, and is led to the floor drain pipe 140 directly connected to the lower cylindrical main body 22 via the upper opening 22x and the lower opening 22y of the lower cylindrical main body 22. The drainage path in the drain trap 1 described above is generated along the height direction or radial direction of the approximately cylindrical outer shape, and is limited to spread on a plane including the left-right direction and the front-back direction that are approximately perpendicular to the central axis CA.

[0103] In the drain trap 1 of this embodiment, the pair of slits 21x in the central cylinder main body 21 of the second sub-cylinder portion 20 are positioned higher than the pair of slits 11y in the first sub-cylinder portion 10, so that the drainage water from the second internal space IS2 remains in the second internal space IS2 as a water seal SW until it reaches the pair of slits 21x in the central cylinder main body 21 of the second sub-cylinder portion 20 and reaches an overflow state. This prevents odors and gases from downstream of the floor drain pipe 140 from rising up to the tank unit 110.

[0104] The drain trap 1 also functions as a bottle trap, i.e., a non-siphon trap, in which the volume difference between the pair of slits 11y and 21x that form the drain path and the second internal space IS2 that accumulates the seal water SW is large. This prevents seal rupture and abnormal noise caused by the self-siphoning phenomenon that occurs in siphon traps.

[0105] The drain trap 1 of the embodiment of the present invention as described above is configured to function as a bottle trap, and the first internal space IS1 communicating with the tank body unit 110, the third internal space IS3 communicating with the floor drain pipe 140, and the second internal space IS2 communicating with each of the first internal space IS1 and the third internal space IS3 are formed concentrically when viewed in the vertical direction, and the communication paths between the first internal space IS1 to the third internal space IS3 are formed mainly along the radial direction of the concentric circles when viewed in the vertical direction, and do not extend outside the circumference of the third internal space IS3 located at the outermost periphery.

[0106] Corresponding to the above-mentioned drainage paths, the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30 for forming the first to third internal spaces IS1 to IS3 are also arranged concentrically when viewed in the vertical direction. Furthermore, the communication paths between the first to third internal spaces IS1 to IS3 are formed by crossing each of the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30 along the radial or axial direction of the concentric circles via a pair of slits 11y, a pair of slits 21x, and a gap 22h.

[0107] As a result of having the above-described configuration, the drain trap 1 of this embodiment shares a central axis CA with the tank body unit 110 and the floor drain pipe 140 arranged directly below the tank body unit 110 when viewed from the left and right and up and down directions, and has an approximately cylindrical outer shape that is rotationally symmetrical about the central axis CA.

[0108] Therefore, like the drainage path, the shape of the drain trap 1 also follows the height and radial directions of the approximately cylindrical outer shape, and its expansion on a plane including the left-right and front-back directions that are approximately perpendicular to the central axis CA is suppressed. Specifically, the piping and other components for connecting the drain trap 1 and the floor drain pipe 140 do not protrude outside the exterior of the drain trap 1 when viewed from above and below.

[0109] As a result, even when the drain trap 1 of this embodiment is disposed below a tank body such as a washbasin, it is possible to prevent the expansion of the space occupied by the drain trap 1 itself. Furthermore, when the drain trap 1 is disposed coaxially with the drain outlet 112x of the tank body 111 and the floor drain pipe 140 on the central axis CA, as in the drain system 100, it is possible to obtain a space-saving drain system that minimizes the occupied space.

[0110] Furthermore, the drain trap 1 of this embodiment, as shown particularly in Figures 3 and 4, is configured so that the first sub-cylinder portion 10 for forming the first internal spaces IS1 and IS2 is inserted into the central cylinder main body portion 21 through the upper opening 23x of the upper cylinder main body portion 23 of the second sub-cylinder portion 20, and is also characterized in that the first sub-cylinder portion 10 is fixed to the second sub-cylinder portion 20 by a fixing screw S1 inserted from the upper opening 11x of the first sub-cylinder portion 10 through an attachment hole 11z provided in the center of the bottom 11c of the first sub-cylinder portion 10.

[0111] As a result, when the tank body unit 110 is separated from the drainage system 100, the first sub-cylinder portion 10 can be freely attached and detached via the upper cylinder main body portion 23 of the second sub-cylinder portion 20, which is the exposed opening of the drain trap 1. Therefore, cleaning and maintenance of the first sub-cylinder portion 10 can be performed without separating the tank body unit 110 from the drainage system 100 after construction or disassembling the entire tank body unit 110, thereby improving the workability of cleaning and maintenance.

[0112] Furthermore, as shown particularly in Figures 1 and 3, the drain trap 1 of this embodiment is characterized in that the shape of the second sub-cylinder portion 20 and the third sub-cylinder portion 30, which are the exterior parts, when viewed from above, has an outer diameter that is large enough to be inserted freely into the installation hole 130x, which is a through hole formed on the base 130 of the vanity on which the tank unit 110 is arranged, while also being provided with a flange 25 that is formed to extend circumferentially from the upper opening 23x and a plane that is approximately horizontal.

[0113] This allows the drain trap 1 to be fixed so as to be freely inserted and removed into the installation hole 130x from the side where the tank body unit 110 is installed, thereby improving the workability during installation and maintenance of the drainage system 100.

[0114] Furthermore, the drain trap 1 of this embodiment is characterized in that the tank body unit 110 is removably fixed to the drain trap 1 by fitting the tip portion 112a of the tube body 112 of the tank body unit 110 into the gap G formed between the first sub-cylinder portion 10 and the second sub-cylinder portion 20, as shown particularly in Figures 1 and 3.

[0115] This makes it possible to separate the tank body unit 110 without requiring any special construction or tools in the drainage system 100 after installation, improving workability when cleaning or maintaining the tank body unit 110 or the drain trap 1, as well as when replacing the tank body unit 110 and other work.

[0116] Furthermore, the drain trap 1 of this embodiment is characterized in that the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30 and the blocking portion 40 are combined only by fitting and screwing the respective components together, without using technical means such as bonding or welding that involve irreversible deformation of the respective components.

[0117] This allows the drain trap 1 to be disassembled into parts that maintain the same quality as before the assembly is completed, even after the assembly is completed, improving workability during maintenance and further improving convenience when reusing.

[0118] Furthermore, the drain trap 1 of this embodiment is characterized in that the combination direction of each component of the second sub-cylindrical portion 20, the third sub-cylindrical portion 30 and the blocking portion 40 is aligned in a direction along the central axis CA, which matches the combination direction of the first sub-cylindrical portion 10 and the second sub-cylindrical portion 20.

[0119] This allows the drain trap 1 to be easily assembled and disassembled, improving workability during construction and maintenance.

[0120] 17(A) and 17(B), the first sub-cylindrical body 10 of the drain trap 1 may be configured to have a maintenance handle 12. The handle 12 includes a handle main body 12a having a generally arc-shaped outer shape, and a fixing portion 12b that is molded integrally with the cylindrical main body 11 or fixed as a separate member on the upper edge 11e of the cylindrical main body 11 of the first sub-cylindrical body 10.

[0121] The handle main body portion 12a is a member made of metal or synthetic resin, and as shown in particular in Figure 17(B), has an outer shape that roughly matches half the circumference of the bottom surface of the cylindrical main body portion 11, and both ends are bent toward the central axis.

[0122] The fixing portions 12b are provided in a pair on the left and right along the radial direction of the cylindrical body 11. Each fixing portion 12b has a through-hole 12x that penetrates in the left-right direction. By fitting both bent ends of the handle body 12a into the through-holes 12x of the fixing portions 12b, the handle body 12a is fixed to the cylindrical body 11 so as to be rotatable about an axis in the left-right direction.

[0123] By providing such a handle 12, the first sub-cylinder portion 10 can be easily accessed from a side closer to the upper side of the drain trap 1 by operating the handle 12, thereby improving the ease of attachment and detachment to and from the second sub-cylinder portion 20.

[0124] Next, an example of an environment in which a drainage system having the drain trap 1 according to an embodiment of the present invention is installed will be described with reference to FIG.

[0125] The washbasin / hand-washing facility 200 comprises a drainage system 100 having a drain trap 1 according to an embodiment of the present invention, a washbasin 150 in which the drainage system 100 is arranged, and a discharge device 160 arranged in the washbasin 150 and constituting a faucet device.

[0126] The washbasin 150 holds the base 130 at a predetermined height above the floor 201 on which the washbasin / hand-washing equipment 200 is arranged, and houses inside it the drain trap 1 and floor drain pipe 140 of the drainage system 100, as well as the piping and heating equipment that make up the discharge device 160.

[0127] Furthermore, the tank body 111 of the tank body unit 110 is placed on the base 130 of the washbasin, with the drain outlet 112x closed by the drain outlet cover 120. Furthermore, on the base 130, there are provided a discharge pipe 161, which is part of the discharge device 160, that discharges hot and cold water into the tank body 111 through a discharge outlet 162, and an operation unit 163 for accepting operations such as opening and closing the discharge pipe 161 and adjusting the temperature of the hot and cold water.

[0128] Applying the drainage system 100 having the drain trap 1 of the embodiment of the present invention to such a bathroom / hand-washing facility 200 has the following effects: When installing the bathroom / hand-washing facility 200 of the embodiment of the present invention in a small space such as a store, an entranceway, a bedroom, or the like where the floor 201 or other space is limited, the washbasin 150 must also be small in size, and the space for installing the drainage system and discharge device therein is also limited. Furthermore, the tub body 111 installed in the washbasin 150 has a relatively small outer diameter and a steep inner angle, so the flow rate of the wastewater from the tub body 111 is likely to be high.

[0129] Therefore, the use of the drain trap 1, which is arranged on a common central axis with the tank body 111 and the floor drain pipe 140, and which functions as a bottle trap that can prevent the space it occupies from expanding and suppress the generation of abnormal noise, and the drain system 100 that includes it, is particularly suitable when installing the washbasin / hand-washing equipment 200 in such a small space.

[0130] As described above, the drain trap 1 according to the embodiment of the present invention has the effect of making it possible to suppress an increase in the space occupied below a tank body such as a washbasin.

[0131] (Other embodiments) However, the present invention is not limited to the above-described embodiment.

[0132] In the above embodiment, the drain trap 1 has a cylindrical section formed by a combination of a first sub-cylindrical section 10, a second sub-cylindrical section 20, a third sub-cylindrical section 30, and a blocking section 40, and the first internal space IS1 to the third internal space IS3 are formed thereby.

[0133] On the other hand, the present invention comprises a cylindrical portion having an approximately columnar outer shape and forming a first internal space communicating with the tank body at a first communication position, a second internal space formed around the outer periphery of the first internal space and communicating with the first internal space, and a third internal space formed around the outer periphery of the second internal space and communicating with each of the second internal space and a drain pipe, wherein the second communication position where the first internal space communicates with the second internal space is below the first communication position, the third communication position where the second internal space communicates with the third internal space is above the second communication position, and the fourth communication position where the third internal space communicates with the drain pipe is below the second communication position, the second communication position and the fourth communication position are arranged along the central axial direction of the first internal space, and the third communication position is located on the side opposite to the peripheral surface of the first internal space.

[0134] Therefore, the cylindrical body of the present invention may be configured from a single member or a combination of any multiple members, and is not limited by the specific shape of each member or the specific manner in which they are combined. For example, the shapes of the first sub-cylinder member 10, the second sub-cylinder member 20, and the third sub-cylinder member 30 in a top view may all be rectangular or elliptical, or may differ for each cylindrical body.

[0135] Furthermore, in the above embodiment, in the drain trap 1, the first sub-cylindrical portion 10, the second sub-cylindrical portion 20, the third sub-cylindrical portion 30 and the blocking portion 40 are arranged concentrically, sharing the central axis CA.

[0136] On the other hand, the present invention may be applied to a cylindrical portion having a generally columnar outer shape and defining a first internal space communicating with the tank body at a first communication position, a second internal space formed around the outer periphery of the first internal space and communicating with the first internal space, and a third internal space formed around the outer periphery of the second internal space and communicating with both the second internal space and the drain pipe. Therefore, the first sub-cylindrical portion 10, the second sub-cylindrical portion 20, the third sub-cylindrical portion 30, and the closure portion 40 may all or partly be arranged in a manner sharing different central axes.

[0137] Furthermore, in the above embodiment, in the drain trap 1, the first sub-cylinder portion 10 is fixed so as to be freely detachable from the upper opening 23x side of the upper cylinder main body portion 23 of the second sub-cylinder portion 20, but it may also be fixed so as to be freely detachable from the bottom of the second sub-cylinder portion 20.

[0138] Furthermore, in the above embodiment, the first sub-cylinder portion 10 is configured to be inserted into the central cylinder main body portion 21 through the upper opening 23x of the upper cylinder main body portion 23 of the second sub-cylinder portion 20, and the first sub-cylinder portion 10 is fixed to the second sub-cylinder portion 20 by a fixing screw S1 inserted from the upper opening 11x of the first sub-cylinder portion 10 through an attachment hole 11z provided in the center of the bottom 11c of the first sub-cylinder portion 10.

[0139] On the other hand, the cylindrical portion of the drain trap of the present invention has a plurality of sub-cylindrical portions, and the first internal space is formed by any one of the plurality of sub-cylindrical portions, and any one of the plurality of sub-cylindrical portions forming the first internal space may be fixed so as to be freely detachable from the side where the tank body is located relative to the remaining plurality of sub-cylindrical portions.

[0140] Therefore, when viewed from above, the first sub-cylinder portion 10 may be removably fixed in the gap G between the first sub-cylinder portion 10 and the second sub-cylinder portion 20, or may be removably fixed at any point when viewed from the left and right or front and back.

[0141] However, as in this embodiment, the configuration in which the drain trap is fixed via the first internal space IS1 that communicates with the upper opening 11x is preferable because the space for performing the fixing work and operations can be used as the first internal space IS1 as a component of the bottle trap, thereby preventing the drain trap from becoming larger.

[0142] Furthermore, in the above embodiment, the first sub-cylinder portion 10 is fixed to the second sub-cylinder portion 20 by a fixing screw S1 inserted from the upper opening 11x of the first sub-cylinder portion 10 through an attachment hole 11z provided in the center of the bottom 11c of the first sub-cylinder portion 10.

[0143] On the other hand, the present invention is not limited to the specific manner of detachment, as long as any one of the multiple sub-cylindrical portions forming the first internal space is fixed to the remaining multiple sub-cylindrical portions in a manner that allows it to be freely detached from the side where the tank body is located.

[0144] Therefore, for example, the first sub-cylinder portion 10 and the second sub-cylinder may be configured to have a shape that allows them to be screwed together, or may be configured to have a shape that allows them to be joined by fitting together. In particular, a configuration in which the first sub-cylinder portion 10 is directly fixed to the second sub-cylinder has the advantage that the fixing operation can be performed from above the first sub-cylinder portion 10, improving workability, and is therefore preferable.

[0145] As described above, the present invention allows various modifications to be made to the above-described embodiments, including those described above, in terms of configuration, shape, material, quantity, position, arrangement, etc., without departing from the scope of the technical idea and purpose of the present invention, and such modifications are included in the present invention. [Industrial Applicability]

[0146] The present invention as described above has the effect of making it possible to suppress the expansion of the space occupied below a tank body such as a washbasin, and is useful when applied to, for example, a washstand. [Explanation of symbols]

[0147] 1 drain trap 10 first sub-cylinder portion, 10x 20x 23w cylinder space, 11 cylinder body portion, 11a outer peripheral surface, 11b inner peripheral surface, 11c bottom, 11d leg portion, 11e upper edge portion, 11w recessed groove, 11x upper opening, 11y slit, 11z mounting hole, 12 handle, 12a handle body portion, 12b fixing portion, 12x through hole 20 Second sub cylinder body part, 21 Central cylinder body part, 21a 22a 22c 23a 24a 24b Outer circumferential surface, 21b 22d Inner circumferential surface, 21c Bottom, 21d Outer surface, 21e 22g Leg part, 21f Convex end, 21x Slit, 21y Concave surface, 21z 23z Mounting hole, 22 Lower cylinder body, 22b Inner circumference, 22e 22f Male thread, 22w Middle opening, 22x 23x Upper opening, 22y 23y Lower opening, 22z 23b 23c 23d 23e 24d Edge, 23 Upper cylinder body, 24 Boundary cylinder body, 24x 24y Concave groove, 25 flange 30 Third sub cylinder part, 31 cylinder main body part, 31a outer peripheral surface, 31b inner peripheral surface 31x top opening, 31y bottom opening 40 Closure portion, 40x Upper opening, 40y Lower opening, 41 Closure body portion, 41a 41c Groove, 41b Inner peripheral surface, 42 Flange portion, 43 Nut portion, 43a Female thread 50 O-ring holder, 50x opening, 51 ring body, 52 flange, 52x mounting hole 60 cap, 60x upper opening, 60y lower opening, 61 cap body, 61a female thread, 61b edge 100 drainage system, 110 tank body unit, 111 tank body, 111x 112y opening, 112 pipe body, 112a tip portion, 112b male thread, 112x drain port, 113 sponge packing, 114 triangular packing, 115 slip packing, 116 lock nut, 116a female thread, 120 drain port cover, 130 base, 130x arrangement hole, 140 floor drain pipe, 150 sink, 160 discharge device, 161 discharge pipe, 162 discharge port, 163 operation part 200 Washroom and hand washing facilities, 201 Floor G 22h clearance, CA central axis, IS1 first internal space, IS2 second internal space, IS3 third internal space, O1 O-ring, P1 P3 P4 P5 P6 packing, S1 S2 fixing screw, SW water seal

Claims

[Claim 1] A drain trap is disposed between a tank body and a drain pipe extending from directly below the tank body toward the tank body and draining water from the tank body, It has a generally columnar outer shape, a first internal space communicating with the tank body at a first communication position; a second interior space formed around the outer periphery of the first interior space and in communication with the first interior space; and a third internal space formed around the outer periphery of the second internal space and communicating with both the second internal space and the drain pipe; a cylindrical portion formed with The cylindrical portion is a first sub-cylinder portion having a cylindrical first wall body that forms the first internal space and a part of the second internal space, and has one open end communicating with the tank body and the other open end communicating with the second internal space; a second sub-cylinder portion that defines a remaining portion of the second internal space and a portion of the third internal space, and that has a cylindrical second wall including a bottom surface facing the other open end of the first sub-cylinder portion and spaced apart from it, and an inner surface facing the outer surface of the first sub-cylinder portion and spaced apart from it; a third sub-cylindrical portion that forms a remaining portion of the third internal space and has a cylindrical third wall including an inner surface that faces the outer surface of the second sub-cylindrical portion and is spaced apart from the outer surface of the second sub-cylindrical portion; a second communication position where the first internal space and the second internal space communicate with each other is below the first communication position; a third communication position where the second internal space and the third internal space communicate with each other is above the second communication position; a fourth communication position where the third internal space and the drain pipe communicate with each other is lower than the second communication position; the second communication position and the fourth communication position are arranged to overlap each other when viewed in the extension direction of the cylindrical body portion, the third communication position is located on a side facing an outer surface of the first sub-cylindrical portion, The first wall body has an innermost periphery of the cylindrical portion, The third wall and a part of the second wall are configured to have an outermost periphery of the cylindrical portion, the remaining portions of the second wall body form a periphery between the innermost periphery and the outermost periphery of the cylindrical portion, the fourth communication position is formed in the second sub-cylindrical portion; Drain trap.

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