Drain trap, drainage system, and construction method for drainage system

Abstract

To provide a drain trap capable of suppressing expansion of a space occupied by the drain trap below a tank body such as a wash basin.SOLUTION: A drain trap 1 disposed between a tank unit 110 and a floor drain pipe 140 that drains water from the tank unit 110 comprises: a first sub-tube body part 10, a second sub-tube body part 20, and a third sub-tube body part 30 as tube body parts forming a first internal space IS1 having a substantially columnar outer shape and allowing water from the tank to flow in through a slit 64, a second internal space IS2 formed around the inner periphery of the first internal space IS1 and communicating with the first internal space IS1, and a third internal space IS3 formed around the inner periphery of the second internal space IS2 and communicating with each of the second internal space IS2 and the drain pipe 140.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a drain trap and a drainage system having a tank body such as a washbasin or hand-washing basin equipped with the same. [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 of a continuous thin pipe that curves significantly in a direction approximately perpendicular to the extension direction of the above-mentioned piping, which is mainly parallel to the vertical direction, and accumulate drainage water from the washbasin as seal water in the part that curves to be convex 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 trap has the following problems. In the conventional drain trap, the pipe for storing the sealing water is arranged with a certain extent in the space adjacent to the piping. This space is formed inside the vanity where the washbasin is arranged, but it narrows the storage space of the vanity or makes the vanity larger.

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

[0006] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a compact drain trap and a drainage system equipped with the same, which make it possible to prevent the expansion of space occupied below a tank body such as a washbasin. [Means for solving the problem]

[0007] The first aspect of the present invention is 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, a first internal space having a generally columnar outer shape and into which water from the tank body flows at a first communication position; a second interior space formed around an inner periphery of the first interior space and in communication with the first interior space; and a third interior space formed around an inner periphery of the second interior space and in communication with both the second interior space and the drain pipe; A cylindrical portion forming a second communication position where the first internal space and the second internal space communicate with each other is lower than 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; The fourth communication position where the third internal space and the drain pipe communicate with each other is lower than the second communication position. It is a drain trap.

[0008] In the second aspect of the present invention, the first internal space, the second internal space and the third internal space are preferably arranged along the central axis of the third internal space.

[0009] In the third aspect of the present invention, the first internal space, the second internal space and the third internal space are preferably arranged to be rotationally symmetric with respect to a central axis of the third internal space.

[0010] In the fourth aspect of the present invention, the first communication position is preferably located on a side facing the circumferential surface of the first internal space.

[0011] In the fifth aspect of the present invention, it is preferable that the cylindrical portion has an outer shape that allows it to be inserted into an opening formed in the base on which the tank body is placed.

[0012] In the sixth aspect of the present invention, it is preferable that the cylindrical portion has a plurality of sub-cylindrical portions, and the plurality of sub-cylindrical portions are detachably fixed in a direction along the central axis of the third internal space.

[0013] In the seventh aspect of the present invention, The plurality of sub-cylinder portions of the cylinder portion include a first sub-cylinder portion which is one of the plurality of sub-cylinder portions and which forms a part of a first internal space, and has a cylindrical first wall into which water from the tank body flows at a first communication position located at one open end side and which communicates with a second internal space at the other open end side; a second sub-cylindrical portion which is another of the plurality of sub-cylindrical portions and has an outer peripheral surface facing the inner peripheral surface of the first sub-cylindrical portion and an inner peripheral surface facing the second internal space, and which has a cylindrical second wall which forms a remaining part of the first internal space and a part of the second internal space; It is preferable to have a third sub-cylinder portion which is one of the remaining sub-cylinder portions, has an outer peripheral surface facing the inner peripheral surface of the second sub-cylinder portion and an inner peripheral surface facing the third internal space, and has a cylindrical third wall which forms the third internal space together with a remaining portion of the second internal space.

[0014] In the eighth aspect of the present invention, it is preferable that the tank body, the first sub-cylinder portion, the second sub-cylinder portion and the third sub-cylinder portion are combined so as to be freely detachable in a direction along the central axis of the third internal space.

[0015] In the ninth aspect of the present invention, it is preferable that the device further comprises an inlet portion having a connecting portion to be connected to the tank body and a slit communicating with the first internal space at the first communication position.

[0016] The tenth aspect of the present invention is A tank body; A base on which the tank body is placed; and The drainage system includes the drain trap described above, which is removably attached to the tank body.

[0017] The eleventh aspect of the present invention is A base on which the tank body is placed; and A method for constructing a drainage system using the drainage trap according to claim 1 or 2, which is detachably attached to a tank body, comprising: The base has a through hole formed therein, The method further includes a step of connecting the tank body and the drain trap after placing the tank body on the base through the through hole or before placing the tank body on the base through the through hole. This is a construction method for a drainage system. Effect of the Invention

[0018] The present invention as described above has the effect of making it possible to suppress the expansion of the space occupied by a drain trap 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 refers to the drawings. [Brief description of the drawings]

[0020] [Figure 1] 1 is a front cross-sectional view showing a configuration of a drainage system having a drain trap according to an embodiment of the present invention. [Diagram 2] 1 is a front exploded view showing a configuration of a drainage system having a drain trap according to an embodiment of the present invention. [Diagram 3]1 is a front exploded view showing a configuration of a drain trap according to an embodiment of the present invention. [Figure 4] This is a front view including an enlarged cross-sectional view of the configuration including the drain trap, drain outlet cover, pipe body, etc. from a drainage system having a drain trap of an embodiment of the present invention, with the tank body, base and floor drain pipe removed. [Diagram 5] (A) is a plan view of the inlet section, (B) is a front view including a cross-sectional view along line VB-VB in (A), and (C) is a front view including a cross-sectional view along line VC-VC in (A). [Figure 6] 13A is a cross-sectional view taken along line VIA-VIA of the third sub-cylinder portion in FIG. 13B, and FIG. 13B is a front view including a cross-sectional view of the third sub-cylinder portion. [Figure 7] 1A is a plan view of the second sub-cylinder portion, and FIG. 1B is a front view including a cross-sectional view of the second sub-cylinder portion. [Figure 8] 1A is a plan view of the first sub-cylinder portion, and FIG. 1B is a front view including a cross-sectional view of the first sub-cylinder portion. [Figure 9] FIG. 2 is an explanatory diagram of the flow of drainage from the drain cover to the floor drain pipe in the drainage system. [Figure 10] 1 is a perspective view showing a schematic configuration of a washbasin and hand-washing facility using a drainage system having a drain trap according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

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

[0022] (1) Drainage system configuration (1-1) Overall configuration of the drainage system Fig. 1 is a front cross-sectional view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention. Fig. 2 is a front exploded view showing the configuration of a drainage system having a drain trap according to an embodiment of the present invention. Fig. 3 is a front exploded view showing the configuration of a drain trap according to an embodiment of the present invention. Fig. 4 is a front view including an enlarged cross-sectional view of a configuration including a drain trap, a drain outlet cover, a pipe body, etc., with the tank body, base, and floor drain pipe removed from the drainage system having a drain trap according to an embodiment of the present invention.

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

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

[0025] The pipe 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, that is, a tip end 112a side, connected to the drain trap 1. The pipe 112 has a male thread (not shown) formed on the outer circumferential surface on the drain port 112x side.

[0026] The pipe 112 is inserted into the opening 111x from inside the tank body 111 via the sponge packing 113. A triangular packing 114 and a sliding packing 115 are fitted into a part of the pipe 112 exposed to the outside of the tank body 111, in that order from the side closer 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 (not shown) formed on the inside of the male thread (not shown) of the pipe 112 into the male thread (not shown).

[0027] The drain trap 1 is a means for connecting the tub unit 110 to a floor drain pipe (an example of a drain pipe) 140 that protrudes from the floor on which the washbasin is placed.

[0028] The drain trap 1 has a substantially cylindrical outer shape formed to be rotationally symmetrical around the central axis CA. The central axis CA is shared by the tank unit 110 including the opening 111x of the tank 111 and the pipe body 112, the installation hole 130x of the base 130 (an example of a through hole formed in the base), and the floor drain pipe 140. The drain trap 1 also has three cylinders, the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30, each of which has a substantially cylindrical outer shape that is rotationally symmetrical around the central axis CA, a blocking portion 40, and an inlet portion 60. When viewed from the central axis CA side, in the drain trap 1, the first sub-cylinder portion 10 forms the outermost circumference, the third sub-cylinder portion 30 forms the innermost circumference, and the second sub-cylinder portion 20 forms the circumference between the first sub-cylinder portion 10 and the third sub-cylinder portion 30. The first to third sub-cylindrical portions 10 to 30 are concentrically arranged, so that the drain trap 1 has a roughly triple-cylindrical configuration.

[0029] Furthermore, the drain trap 1 has an outer diameter large enough to be inserted into the installation hole 130x, which is a through hole formed on the base 130 of the vanity on which the tank body unit 110 is disposed. Therefore, for example, when the drain trap 1 is attached to the tank body unit 110, the drain trap 1 can be inserted into and removed from the base 130 through the installation hole 130x. In the above, the tank body unit 110 is attached to the base 130 after the drain trap 1 is attached to the tank body unit 110, but the drain trap 1 may be attached to the tank body unit 110 with the tank body unit 110 attached to the base. The tank body unit 110 can be attached to the base 130 with the entire tank body 111 exposed on the upper part of the base 130. The tank body unit 110 may also be attached to the base 130 in a partially embedded state in which only a part of the tank body 111 is exposed on the upper part of the base 130 and the remaining part is located at the lower part of the base 130. Furthermore, the tank body unit 110 may be attached to the base 130 in a completely embedded state, with the upper edge of the tank body 111 being flush with the base 130 and the entire tank body 111 being located below the base 130 .

[0030] Furthermore, the drain trap 1 has a lower portion of the space forming portion 31e of the third sub-cylinder portion 30 connected to the floor drain pipe 140 by screwing in the cap 50 described below. As a result, the tank body unit 110 and the floor drain pipe 140 are connected in the middle via the drain trap 1, 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 part that can be detached and attached, when viewed from the central axis CA direction, and is closed in a state in which it can communicate with the pipe body 112.

[0031] (1-2) Structure of the drain trap The drain trap 1 will be further described below. Here, in the following description of the present invention, the directions to be described with reference to each figure based on the above description will be defined as follows. That is, the direction along the central axis CA in FIG. 1, FIG. 2, etc. is defined as the up-down direction, the side where the tank body 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. In addition, the direction to the right hand side of the plane of FIG. 1 is defined as the right side, the direction to 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 direction and the left-right direction is defined as the front-rear direction, the direction toward the front side of the plane of FIG. 1 is defined as the front, and the direction toward the back side is defined as the rear. Each direction is indicated by the Cartesian coordinate system shown in each figure, and the following description will be made with reference to the coordinate system shown in the figure as appropriate.

[0032] The drain trap 1 of the embodiment of the present invention has an upper opening 61x connected to the tank body unit 110 as an upper opening end in the drainage system 100, and a lower opening 31z connected to the floor drain pipe 140 as a lower opening end, and directs drainage water (an example of 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.

[0033] As described above, the drain trap 1 has three cylinders, the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30, each having a substantially cylindrical outer shape, the blocking portion 40, and the inlet portion 60. The first to third sub-cylinder portions 10 to 30 are each rotationally symmetric about the central axis CA, and are arranged so as to form concentric circles when viewed from above. The blocking portion 40 and the inlet portion 60 also have a substantially cylindrical outer shape and are arranged along the central axis CA.

[0034] The inlet portion 60 is a member that directly communicates with the pipe body 112 of the tank unit 110, and is a member that constitutes the upper part of the exterior of the drain trap 1. The first sub-cylinder portion 10 is located on the outermost peripheral side of the drain trap 1 and is connected to the inlet portion 60, and is a member that constitutes the central part of the exterior of the drain trap 1. The third sub-cylinder portion 30 is located on the innermost peripheral side of the drain trap 1 and is connected to the floor drain pipe 140, and is a member that constitutes a part of the lower part of the exterior of the drain trap 1. A part of the third sub-cylinder portion 30 is accommodated in the second sub-cylinder portion 20, and another part of the third sub-cylinder portion 30 is surrounded by the first sub-cylinder portion 10. The second sub-cylinder portion 20 is accommodated in the first sub-cylinder portion 10 between the first sub-cylinder portion 10 and the third sub-cylinder portion 30. The blocking portion 40 is a member that integrally assembles the first sub-cylinder portion 10 and the third sub-cylinder portion 30, and also constitutes another part of the lower part of the exterior of the drain trap 1.

[0035] The drain trap 1 functions as the drain trap 1, 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, the closing portion 40, and the inlet portion 60. The first to third sub-cylinder portions 10 to 30, the closing portion 40, and the inlet portion 60 will be described below.

[0036] In Fig. 5, (A) is a plan view of the inlet portion, (B) is a front view including a cross-sectional view taken along line VB-VB in (A), and (C) is a front view including a cross-sectional view taken along line VC-VC in (A). In Fig. 6, (A) is a cross-sectional view taken along line VIA-VIA of the third sub-cylinder portion in (B), and (B) is a front view including a cross-sectional view of the third sub-cylinder portion. In Fig. 7, (A) is a plan view of the second sub-cylinder portion, and (B) is a front view including a cross-sectional view of the second sub-cylinder portion. In Fig. 8, (A) is a plan view of the first sub-cylinder portion, and (B) is a front view including a cross-sectional view of the first sub-cylinder portion.

[0037] (Inflow section 60) 5, the inflow section 60 is a member that sends out the water flowing in from the pipe body 112 to a first internal space IS1 described below. The inflow section 60 is a member made of a synthetic resin such as polypropylene or hard polyvinyl chloride.

[0038] The inlet section 60 has, from top to bottom, an inlet section upper part (an example of a connecting part) 61, a leg part 62, and an inlet section lower part 63. In addition to the side walls serving as walls forming the inner and outer circumferential surfaces, the inlet section 60 has an upper opening 61x that opens upward, a slit 64 in the side wall that opens in the left-right direction, and an inlet section lower part 63 that forms the bottom, thereby forming a substantially bottomed cylindrical outer shape with a closed bottom.

[0039] The inlet upper portion 61 is formed in a cylindrical shape and has an upper stage portion 61a and a lower stage portion 61b that is continuous with the lower side of the upper stage portion 61a. The upper end of the upper stage portion 61a forms an upper opening 61x that communicates with an opening 112y of the tube body 112. The inner peripheral surface of the upper stage portion 61a is formed with a female thread 61c that screws with a male thread (not shown) formed on the outer peripheral surface of the tube body 112. In addition, the outer peripheral surface of the lower stage portion 61b is formed with a male thread 61d that screws with a female thread (not shown) formed on the inner peripheral surface 11b of the first sub-tube portion 10. The inner diameter of the lower stage portion 61b is smaller than the inner diameter of the upper stage portion 61a, and the lower stage portion 61b protrudes radially inward from the upper stage portion 61a. As a result, a step is formed inside the inlet upper portion 61 by the upper stage portion 61a and the lower stage portion 61b. A tip end 112a of the pipe 112 is engaged with the step via an annular packing P1.

[0040] The inlet lower portion 63 is formed as a bottom portion of a substantially cylindrical shape. The inlet lower portion 63 has a locking protrusion 63a and a locking portion 63b on the outer circumferential surface. The locking protrusion 63a is formed at the upper end of the inlet lower portion 63 so as to protrude most from the outer circumferential surface of the inlet lower portion 63. The upper end portion 21d of the second sub-cylinder portion 20 is locked to the locking protrusion 63a. The locking portion 63b is formed at the lower end of the inlet lower portion 63. A male thread 63c is formed on the outer circumferential surface of the locking portion 63b, which is screwed with a female thread 31g formed on the upper end portion 31i of the third sub-cylinder portion 30. The diameter of the locking protrusion 63a is larger than the diameter of the locking portion 63b. As a result, a step is formed by the part including the locking protrusion 63a and the locking portion 63b. The step has a locking surface 63d facing downward. The upper end portion 31i of the third sub-cylinder portion 30 abuts against and is locked onto the locking surface 63d.

[0041] Between the inlet portion upper part 61 and the inlet portion lower part 63, a pair of slits 64 (flow paths formed at the first communication position) are formed by cutting through both the left and right sides of the side wall of the inlet portion 60 in the left-right direction. With the pair of slits 64 formed, the remaining parts of the side walls adjacent in the circumferential direction to the pair of slits 64 constitute a pair of legs 62 arranged in the front-rear direction. As a result, the inlet space 60x of the inlet portion 60 communicates with the pipe body 112 at the upper opening 61x, and communicates with a first internal space IS1 described below at the pair of slits 64.

[0042] (Third sub-cylinder portion 30) 6, the third sub-cylinder portion 30 is a member that forms a third internal space IS3 described below, a part of a second internal space IS2 described below, and a part of a communication passage CS (a flow path formed at a second communication position) described below, and sends water flowing in from the second internal space IS2 to the floor drain pipe 140. The third sub-cylinder portion 30 has a cylinder main body portion (an example of a third wall) 31 that is a member made of a synthetic resin such as polypropylene or rigid polyvinyl chloride.

[0043] The cylindrical body 31 has an outer peripheral surface 31a facing the inner peripheral surface 21b of the second sub-cylinder 20, and an inner peripheral surface 31b facing the third internal space IS3. The cylindrical body 31 also has, in order from top to bottom, a mounting portion 31c, a leg portion 31d, and a space forming portion 31e. As a result, the cylindrical body 31 has a side wall as a wall body forming the outer peripheral surface 31a and the inner peripheral surface 31b, as well as the mounting portion 31c forming the ceiling, a slit 31y in which the side wall opens in the left-right direction, and a lower opening 31z (an opening formed at the fourth communication position) opening downward, thereby forming an outer shape of a substantially bottomed cylinder with a closed ceiling portion.

[0044] The mounting portion 31c is formed in a concave shape that opens upward, and is formed as a substantially cylindrical ceiling. Such a mounting portion 31c has an upper end portion 31i of a side wall and a mounting surface 31c1 facing upward. The upper end portion 31i is erected along the outer periphery of the mounting surface 31c1. As a result, the upper portion of the mounting portion 31c is formed in a concave shape by the upper end portion 31i and the mounting surface 31c1. Then, the inlet portion 60 is engaged with the mounting portion 31c so that the lower surface of the inlet portion lower portion 63 contacts the mounting surface 31c1. A female thread 31g that screws with the male thread 63c of the inlet portion lower portion 63 is formed on the inner circumferential surface 31b of the mounting portion 31c. In addition, the mounting portion 31c has an annular locking protrusion 31f protruding from the outer circumferential surface 31a. An annular packing P2 is engaged with the locking protrusion 31f, and a locking protrusion 21c (described later) of the second sub-cylindrical portion 20 is engaged with the packing P2.

[0045] The space forming portion 31e is formed in a substantially cylindrical shape and has an upper opening 31x that opens upward and a lower opening 31z that opens downward. An annular groove 31w is formed along the circumferential direction on the outer peripheral surface 31a below the center in the vertical direction of the space forming portion 31e. An annular packing P3 is attached to the groove 31w. The space forming portion 31e also has a lower end portion 31j that forms the lower opening 31z. The lower end portion 31j is engaged with the cap 50 described below via annular packings P5 and P6.

[0046] Between the placement portion 31c and the space forming portion 31e, a pair of slits 31y (flow passages formed at the third communication position) are formed by cutting through the left and right sides of the side wall of the cylindrical body portion 31 from the outer peripheral surface 31a to the inner peripheral surface 31b. With the formation of the pair of slits 31y, the remaining parts of the side walls adjacent to the pair of slits 31y in the circumferential direction form a pair of legs 31d arranged in the front-rear direction. As a result, the cylindrical inner space 30x of the third sub-cylindrical portion 30 is in communication with the second internal space IS2 described later through the pair of slits 31y on the upper side, and is in communication with the floor drain pipe 140 at the lower opening 31z on the lower side.

[0047] (Second sub-cylinder portion 20) As shown in Figure 7, the second sub-cylinder portion 20 forms a part of the first internal space IS1 and the remaining part of the second internal space IS2 described below, and is a member that sends water flowing in from the first internal space IS1 through the communicating passage CS to the third internal space IS3.

[0048] The second sub-cylinder portion 20 has a cylinder body portion (an example of a second wall) 21 which is a member made of synthetic resin such as polypropylene or hard polyvinyl chloride. The cylinder body portion 21 has an outer peripheral surface 21a facing the inner peripheral surface 11b of the first sub-cylinder portion 10 and an inner peripheral surface 21b facing the second internal space IS2. The cylinder body portion 21 has an upper end portion 21d forming an upper opening 21x opening upward and a lower end portion 21e forming a lower opening 21y opening downward. As a result, the cylinder body portion 21 has a cylindrical outer shape in which both upper and lower ends are connected by having the upper opening 21x and the lower opening 21y in addition to the side walls as walls forming the outer peripheral surface 21a and the inner peripheral surface 21b. The upper end portion 21d is engaged with the engaging protrusion 63a of the inlet portion 60.

[0049] The second sub-cylinder portion 20 has a locking protrusion 21c that partially protrudes from the inner circumferential surface 21b at an upper portion adjacent to the upper end portion 21d. The locking protrusion 21c is locked to the locking protrusion 31f of the third sub-cylinder portion 30 via a packing P2. Although the number is not limited, in the example of FIG. 7, four locking protrusions 21c are evenly arranged in the circumferential direction.

[0050] (First sub-cylinder portion 10) As shown in FIG. 8, the first sub-cylinder portion 10 forms the remaining part of the communicating passage CS and the remaining part of the first internal space IS1, and is a member that sends out water flowing in from the inlet portion 60 to the second internal space IS2.

[0051] The first sub-cylinder portion 10 has a cylinder body portion (an example of a first wall) 11 which is a member made of synthetic resin such as polypropylene or hard polyvinyl chloride. The cylinder body portion 11 has an outer peripheral surface 11a and an inner peripheral surface 11b which faces the outer peripheral surface 21a of the second sub-cylinder portion 20. The cylinder body portion 11 has an upper end portion 11c which forms an upper opening 11x which opens upward, and a lower end portion 11d which forms a lower opening 11y which opens downward. As a result, the cylinder body portion 11 has the upper opening 11x and the lower opening 11y in addition to the side walls which form the outer peripheral surface 11a and the inner peripheral surface 11b, thereby forming a cylindrical outer shape in which both the upper and lower ends are connected. A female thread (not shown) is formed on the inner peripheral surface 11b of the upper end portion 11c. The female thread and the male thread 61d of the inlet portion upper part 61 of the inlet portion 60 are screwed together, thereby fixing the first sub-cylinder portion 10 and the inlet portion 60 to each other. The lower end portion 11d is inserted into a recess 43 (described later) of the blocking portion 40 via an annular packing P4.

[0052] (Occluded part 40) As shown in FIG. 4, the blocking portion 40 supports the lower end portion 11d of the first sub-cylinder portion 10 and is attached to the outer peripheral surface 31a of the third sub-cylinder portion 30, thereby assembling the first sub-cylinder portion 10 and the third sub-cylinder portion 30 together.

[0053] The blocking portion 40 is a member made of a synthetic resin such as polypropylene or hard polyvinyl chloride. The blocking portion 40 has a substantially annular outer shape that communicates from an upper opening 41x that opens upward to a lower opening 41y that opens downward. The blocking portion 40 has an inner peripheral wall 41 and an outer peripheral wall 42.

[0054] The inner peripheral wall 41 has an upper opening 41x and a lower opening 41y, and is formed in a substantially annular shape from the upper opening 41x to the lower opening 41y. A female thread (not shown) that screws into the male thread 31h of the third sub-cylindrical portion 30 is formed on the inner peripheral surface of the inner peripheral wall 41.

[0055] The outer peripheral wall 42 is formed so as to be continuous with the radially outer side of the inner peripheral wall 41 and surround the inner peripheral wall 41. In addition, by cutting out a part of the upper part of the inner peripheral wall 41 and the outer peripheral wall 42, a concave recess 43 that opens upward is formed between the inner peripheral wall 41 and the outer peripheral wall 42. The lower end portion 11d of the first sub-cylindrical portion 10 is inserted into the recess 43 via a packing P4.

[0056] (2) Drainage system construction method The following describes a method for installing the drainage system 100. First, a method for installing the drain trap 1 will be described, and then a method for installing the drain trap 1 in the drainage system 100 will be described.

[0057] (2-1) How to install a drain trap First, an example of a construction method for the drain trap 1 of this embodiment, which is a combination of the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, the blocking portion 40 and the inlet portion 60, will be described below.

[0058] First, the inlet portion 60 and the third sub-cylinder portion 30 are assembled as follows. That is, the locking portion 63b of the inlet portion lower portion 63 is engaged with the concave mounting portion 31c of the third sub-cylinder portion 30. In this case, the male thread 63c of the locking portion 63b is screwed into the female thread 31g of the mounting portion 31c, so that the inlet portion 60 and the third sub-cylinder portion 30 are fixed to each other in a coaxial arrangement sharing the central axis CA. Then, the upper end portion 31i of the third sub-cylinder portion 30 abuts against and is locked to the locking surface 63d of the inlet portion 60.

[0059] Next, the inlet portion 60, the third sub-cylinder portion 30, and the second sub-cylinder portion 20 are combined as follows. A packing P2 is attached between the locking surface 63d of the inlet portion 60 and the locking protrusion 31f of the third sub-cylinder portion 30. In a state in which the inlet portion 60 and the third sub-cylinder portion 30 are fixed, the second sub-cylinder portion 20 is inserted from below so as to cover the outer circumferential surface 31a of the third sub-cylinder portion 30. Then, the upper end portion 21d of the second sub-cylinder portion 20 is locked to the locking protrusion 63a of the inlet portion 60, and the locking protrusion 21c of the second sub-cylinder portion 20 is locked to the locking protrusion 31f of the third sub-cylinder portion 30. As a result, the second sub-cylinder portion 20, the inlet portion 60, and the third sub-cylinder portion 30 are fixed to each other in a coaxial arrangement sharing the central axis CA. At this time, only a portion of the third sub-cylinder portion 30 is covered by the second sub-cylinder portion 20, and the lower end portion 31j of the third sub-cylinder portion 30 is located lower than the lower end portion 21e of the second sub-cylinder portion 20.

[0060] Next, the inlet portion 60 and the second and third sub-cylinder portions 20 and 30 are combined with the first sub-cylinder portion 10 as follows. With the inlet portion 60, the third sub-cylinder portion 30, and the second sub-cylinder portion 20 fixed, the first sub-cylinder portion 10 is inserted from below so as to cover the outer circumferential surface 21a of the second sub-cylinder portion 20. Then, a female thread (not shown) formed on the inner circumferential surface 11b of the upper end portion 11c of the first sub-cylinder portion 10 is screwed into a male thread 61d formed on the outer circumferential surface of the inlet portion upper portion 61 of the inlet portion 60. As a result, the inlet portion 60 and the first sub-cylinder portion 10 are fixed to each other in a coaxial arrangement sharing a central axis CA. At this time, the second sub-cylinder portion 20 is entirely covered by the first sub-cylinder portion 10, a portion of the third sub-cylinder portion 30 is covered by the first and second sub-cylinder portions 10 and 20, and another portion of the third sub-cylinder portion 30 is covered by the first sub-cylinder portion 10. The lower end portion 11d of the first sub-cylinder portion 10 is located lower than the lower end portion 21e of the second sub-cylinder portion 20 and higher than the lower end portion 31j of the third sub-cylinder portion 30.

[0061] Next, the inlet portion 60, the first to third sub-cylinder portions 10 to 30, and the blocking portion 40 are assembled as follows. A packing P3 is attached to the recessed groove 31w of the third sub-cylinder portion 30. A packing P4 is attached to the recessed portion 43 of the blocking portion 40. In addition, in a state in which the inlet portion 60 and the first to third sub-cylinder portions 10 to 30 are fixed, the blocking portion 40 is inserted from below along the outer circumferential surface 31a of the third sub-cylinder portion 30. Furthermore, the lower end portion 11d of the first sub-cylinder portion 10 is inserted into the recessed portion 43. In this state, the male thread 31h of the third sub-cylinder portion 30 and the female thread (not shown) on the inner circumferential surface of the inner circumferential wall 41 of the blocking portion 40 are screwed together. As a result, the inlet portion 60, the first to third sub-cylinder portions 10 to 30, and the blocking portion 40 are fixed to each other in a coaxial arrangement sharing a central axis CA. The third sub-cylinder portion 30 and the closing portion 40 are fixed to each other via the packing P3 in the recessed groove 31w. The lower end 11d of the first sub-cylinder portion 10 is inserted into the recessed portion 43 via the packing P4, whereby the first sub-cylinder portion 10 and the closing portion 40 are fixed to each other.

[0062] As described above, the inlet portion 60, the first to third sub-cylinder portions 10 to 30, and the closing portion 40 form the drain trap 1.

[0063] The drain trap 1 and the tank body unit 110 are connected as follows. In the drain trap 1, a step is formed inside the inflow upper part 61 of the inflow part 60 by the lower step 61b protruding radially inward from the upper step 61a. The tip part 112a of the pipe body 112 of the tank body unit 110 is engaged with the step. Then, a male thread (not shown) on the outer circumferential surface of the pipe body 112 and a female thread 61c of the upper step part 61a are screwed together. In this way, the drain trap 1 is fixed to the tank body unit 110.

[0064] A cap 50 is used to connect the drain trap 1 and the floor drain pipe 140. As shown in Fig. 4, the cap 50 is a member for supporting the third sub-cylinder portion 30 and connecting the third sub-cylinder portion 30 and the floor drain pipe 140. The cap 50 has a cap main body portion 51 which is a member made of a synthetic resin such as polypropylene or rigid polyvinyl chloride.

[0065] The cap body 51 has a side wall extending in the vertical direction and a bottom wall extending radially inward from the lower end of the side wall. A circular through hole is formed in the center of the bottom wall. As a result, the cap body 51 has a substantially annular outer shape that communicates from an upper opening 51x formed by the upper end of the side wall to a lower opening 51y that opens downward through the through hole in the bottom wall. The side wall and the bottom wall form the cap body 51 into an L-shape in cross section. Gaskets P5 and P6 are attached to the corners of the L-shape of the cap body 51 in order from above. A female thread (not shown) that screws into the male thread 31h of the third sub-cylinder 30 is formed on the inner peripheral surface of the side wall.

[0066] (2-2) Construction method for the entire drainage system Next, a method of installing the drain trap 1 configured as above in the entire drainage system 100 will be described. As shown in Figs. 1 to 4, in the drainage system 100, the installation of the drain trap 1 to the tank unit 110 and the floor drain pipe 140 is performed, for example, as follows. The drain trap 1 is placed facing the floor drain pipe 140, which is disposed extending straight upward from the floor surface (not shown), along the central axis CA. The cap 50, with the packings P5 and P6 attached, is inserted beforehand into the floor drain pipe 140 or the lower part of the third sub-cylinder portion 30 of the drain trap 1.

[0067] In the above state, the floor drain pipe 140 is inserted from below along the inner circumferential surface 31b of the third sub-cylinder portion 30. In this example, the outer diameter of the floor drain pipe 140 is approximately the same as or slightly larger than the inner diameter of the third sub-cylinder portion 30. Therefore, the floor drain pipe 140 is inserted into the third sub-cylinder portion 30 with the outer circumferential surface of the floor drain pipe 140 in contact with the inner circumferential surface 31b of the third sub-cylinder portion 30. Next, the cap 50 is positioned at the portion where the third sub-cylinder portion 30 and the floor drain pipe 140 are fitted together. Then, the male thread 31h of the third sub-cylinder portion 30 and the female thread (not shown) of the cap 50 are screwed together, and the third sub-cylinder portion 30 and the floor drain pipe 140 are fastened together. As a result, the drain trap 1 is fixed to the floor drain pipe 140 and connected as a drainage path leading to the floor drain pipe 140.

[0068] The pipe 112 of the tubular unit 110 in which the components are assembled is inserted into the mounting hole 130x of the base 130 of the washbasin. Here, the upper opening 61x of the inflow section 60 is exposed in the drain trap 1 configured as described above. Therefore, the tip 112a of the pipe 112 of the tubular unit 110 is inserted into the upper opening 61x. Then, the male thread (not shown) on the outer circumferential surface of the pipe 112 is screwed into the female thread 61c of the upper section 61a until the tip 112a of the pipe 112 engages with the step formed by the upper section 61a and the lower section 61b of the upper section 61 of the inflow section. As a result, the tubular unit 110 is fixed to the drain trap 1 and is connected as a drainage path connected to the drain trap 1. Thus, a drainage path is formed that connects the tubular unit 110 to the floor drain pipe 140 via the drain trap 1.

[0069] In the above, after connecting the floor drain pipe 140 and the drain trap 1, the tank body unit 110 is placed on the base 130 of the washbasin, and the drain trap 1 is connected to the tank body unit 110. The assembly process of the entire drainage system is not limited to this, and may be, for example, the following assembly process. For example, after connecting the tank body unit 110 and the drain trap 1, it may be placed on the base 130 of the washbasin, and the drain trap 1 and the floor drain pipe 140 may be connected. Also, the tank body unit 110 may be placed on the base 130 of the washbasin, and then the drain trap 1 and the tank body unit 110 may be connected, and then the drain trap 1 and the floor drain pipe 140 may be connected. Also, the tank body unit 110 may be placed on the base 130 of the washbasin, and the drain trap 1 and the floor drain pipe 140 may be connected, and then the drain trap 1 and the tank body unit 110 may be connected.

[0070] The members are fixed to one another via packings P1 to P6, thereby maintaining airtightness and watertightness between the members.

[0071] (3) Water flow in drainage systems (3-1) Drainage route In the drain trap 1 of this embodiment, in which the various components are combined as described above, the drainage 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.

[0072] As shown in FIG. 1 to FIG. 4, in the drain trap 1, a third internal space IS3 is formed by an in-cylinder space 30x surrounded by an inner peripheral surface 31b of the third sub-cylinder portion 30. The third internal space IS3 is a space having a substantially columnar outer shape formed rotationally symmetrically around the central axis CA as viewed in the vertical direction. A second internal space IS2 is formed by a space between the inner peripheral surface 21b of the second sub-cylinder portion 20 and the outer peripheral surface 31a of the third sub-cylinder portion 30. The second internal space IS2 is a space having an outer ring shape centered on the central axis CA as viewed in the vertical direction, formed around the outer periphery of the third internal space IS3. A first internal space IS1 is formed by a space between the inner peripheral surface 11b of the first sub-cylinder portion 10 and the outer peripheral surface 21a of the second sub-cylinder portion 20. The first internal space IS1 is a space having an outer ring shape centered on the central axis CA as viewed in the vertical direction, formed around the outer periphery of the second internal space IS2. A communication passage CS is formed by the inner peripheral surface 11b of the first sub-cylinder portion 10 and the outer peripheral surface 31a of the third sub-cylinder portion 30. The communication passage CS is a space formed around the outer periphery of the third internal space IS3 and communicates between the first internal space IS1 and the second internal space IS2. The communication passage CS is a space having an outer ring shape centered on the central axis CA when viewed in the vertical direction.

[0073] The tank body unit 110 communicates with the inflow space 60x through the upper opening 61x of the inflow portion 60 of the drain trap 1. The inflow space 60x communicates with the first internal space IS1 through a pair of slits 64. The first internal space IS1 and the second internal space IS2 communicate with each other through a communication passage CS. The second internal space IS2 and the third internal space IS3 communicate with each other through a pair of slits 31y. The third internal space IS3 communicates with the floor drain pipe 140 through the lower opening 31z.

[0074] Here, as shown in FIG. 4, the communication passage CS, which is the second communication position between the first internal space IS1 and the second internal space IS2, is located below a pair of slits 64, which is the first communication position between the inflow space 60x of the inflow section 60 and the first internal space IS1.

[0075] Further, the pair of slits 31y which are the third communication position between the second internal space IS2 and the third internal space IS3 are located above the communication passage CS which is the second communication position.

[0076] Further, the lower opening 31z, which is the fourth communication position where the third internal space IS3 and the floor drain pipe 140 communicate with each other, is located below the communication passage CS, which is the second communication position.

[0077] Further, the pair of slits 64 which are the first communication position are located above the pair of slits 31y which are the third communication position, the communication passage CS which is the second communication position, and the lower opening 31z which is the fourth communication position.

[0078] In the above description, the drain trap 1 corresponds to the drain trap of the present invention. Moreover, the combination of the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, the blocking portion 40, and the inlet portion 60 corresponds to the cylinder portion of the present invention. Moreover, the first to third sub-cylinder portions 10 to 30 correspond to the sub-cylinder portions of the present invention. That is, the first sub-cylinder portion 10 corresponds to the first sub-cylinder portion of the present invention, the second sub-cylinder portion 20 corresponds to the second sub-cylinder portion of the present invention, and the third sub-cylinder portion 30 corresponds to the third sub-cylinder portion of the present invention. Moreover, 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.

[0079] The drain trap 1 of the embodiment having the above-mentioned 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 between the tank unit 110 side, which is upstream of the drainage, and the floor drain pipe 140, which is downstream.

[0080] (3-2) Wastewater movement The drainage state of the drain trap 1 incorporated in the drainage system 100 of this embodiment will be described below. Fig. 9 is an explanatory diagram of the flow of drainage from the drain cover to the floor drain pipe in the drainage system. The arrow in Fig. 9 indicates the movement direction of the drainage from the tank unit 110 to the floor drain pipe 140.

[0081] The drainage water from the pipe 112 of the tank unit 110 flows into the inflow space 60x of the inflow section 60 through the upper opening 61x directly connected to the pipe 112, and then flows into the first internal space IS1 after being discharged from the pair of slits 64. The drainage water from the first internal space IS1 flows into the second internal space IS2 through the communication passage CS. The drainage water is then retained as seal water SW in the first internal space IS1, the communication passage CS, and the second internal space IS2.

[0082] When the water level of the seal water SW accumulated in the second internal space IS2 reaches the pair of slits 31y and overflows, the excess drainage water generated by the overflow leaks from the pair of slits 31y into the third internal space IS3. The drainage water in the third internal space IS3 is led to the floor drain pipe 140 through the lower opening 31z.

[0083] (4) Effects As described above, the drainage path in the drain trap 1 occurs along the height or radial direction of the approximately cylindrical outer shape, and expansion on a plane including the left-right and front-back directions approximately perpendicular to the central axis CA is suppressed.

[0084] In addition, in the drain trap 1 of this embodiment, the pair of slits 31y is located above the communication passage CS, and the pair of slits 64 is located above the pair of slits 31y, the communication passage CS, and the lower opening 31z. In particular, the pair of slits 31y is located above the communication passage CS. Therefore, until the drainage water in the second internal space IS2 reaches the pair of slits 31y and reaches an overflow state, the drainage water is retained as a water seal SW in the first internal space IS1, the communication passage CS, and the second internal space IS2. This prevents odors and gases from downstream of the floor drain pipe 140 from rising up to the tank body unit 110.

[0085] In addition, the drain trap 1 functions as a bottle trap, i.e., a non-siphon trap, in which the volume difference between the pair of slits 64 and the pair of slits 31y forming the drain path and the first internal space IS1, the communication passage CS, and the second internal space IS2 accumulating the seal water SW is large. This suppresses the breakage of the seal and the generation of abnormal noise due to the self-siphoning phenomenon as in the siphon trap. In particular, according to the above configuration, the cross-sectional area of ​​the inflow portion where water flows from the pair of slits 64 into the first internal space IS1 and the cross-sectional area of ​​the inflow portion where water flows from the pair of slits 31y into the third internal space IS3 are smaller than the cross-sectional area of ​​the outflow portion where water flows out from the third internal space IS3 to the floor drain pipe 140. With this configuration, the flow rate of water flowing through the first, second, and third internal spaces IS1, IS2, and IS3 can be increased, and the water pressure in these first to third internal spaces IS1 to IS3 can be reduced. Therefore, the occurrence of breakage of the seal and abnormal noise can be suppressed, and damage to the drain trap 1, including damage to the first to third sub-cylindrical portions 10 to 30, can be suppressed.

[0086] In addition, the drain trap 1 according to the embodiment of the present invention as described above is configured to function as a bottle trap, and the first to third internal spaces IS1 to IS3 are formed concentrically when viewed in the vertical direction, and the communication paths (slit 64, communication path CS, slit 31y) between the first to third internal spaces IS1 to IS3 are formed mainly along the radial direction of the concentric circles when viewed in the vertical direction. Therefore, the first to third internal spaces IS1 to IS3 and the communication paths do not protrude outside the circumference of the first internal space IS1 located at the outermost periphery.

[0087] That is, the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30 for forming the first internal space IS1 to the third internal space IS3 corresponding to the above-mentioned drainage paths are arranged concentrically along the axial direction when viewed in the up-down direction. Furthermore, each of the first sub-cylinder portion 10, the second sub-cylinder portion 20, and the third sub-cylinder portion 30 is formed so as to communicate in the radial direction of the concentric circles via a pair of slits 64, a pair of slits 31y, and a communication path CS as communication paths between the first internal space IS1 to the third internal space IS3.

[0088] The drain trap 1 of this embodiment has an overall cylindrical shape that is rotationally symmetrical about a central axis CA when viewed in the left-right and up-down directions. The drain trap 1 shares the central axis CA with the tank body unit 110 and the floor drain pipe 140 disposed directly below the tank body unit 110.

[0089] Therefore, the shape of the drain trap 1 is configured along the height direction and the radial direction of the substantially cylindrical outer shape, similar to the drain path. Therefore, the expansion on a plane including the left-right direction and the front-rear direction substantially 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 in the vertical direction.

[0090] As a result, even when the drain trap 1 of this embodiment is disposed below a tank body 111 such as a washbasin, it is possible to suppress 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, it is possible to obtain a space-saving drainage system 100 in which the occupied space is minimized.

[0091] Furthermore, in the drain trap 1 of this embodiment, cleaning and maintenance of the first to third sub-cylinder portions 10-30, the blocking portion 40, the inlet portion 60, etc. can be performed by removing the cap 50 from the drain trap 1, removing the blocking portion 40 of the drain trap 1, removing the first to third sub-cylinder portions 10-30 of the drain trap 1, etc. Therefore, cleaning and maintenance of the first to third sub-cylinder portions 10-30, the blocking portion 40, the inlet portion 60, etc. 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, which makes it possible to improve the workability of cleaning and maintenance.

[0092] Furthermore, the drain trap 1 of this embodiment is characterized in that each of the components, the first sub-cylinder section 10, the second sub-cylinder section 20, the third sub-cylinder section 30, the blocking section 40 and the inlet section 60, is assembled only by fitting and screwing each of the components together, without using technical means such as bonding or welding that would involve irreversible deformation of each of the components.

[0093] This allows the drain trap 1 to be disassembled into individual parts that maintain the same quality as before the assembly is completed. Also, the need for special work or tools during disassembly can be reduced. This improves the ease of cleaning and maintenance, and also improves the convenience when reusing the product.

[0094] Furthermore, the drain trap 1 of this embodiment is characterized in that the combination directions of each component, the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, the blocking portion 40 and the inlet portion 60, are aligned along the central axis CA.

[0095] This allows the drain trap 1 to be easily assembled and disassembled, improving workability during construction and maintenance.

[0096] (5) Drainage system construction environment Next, an example of an environment in which a drainage system having a drain trap 1 according to an embodiment of the present invention is installed will be described with reference to Fig. 10. Fig. 10 is a perspective view showing a schematic configuration of a washbasin and hand-washing facility using a drainage system having a drain trap according to an embodiment of the invention.

[0097] The washbasin / hand-washing equipment 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.

[0098] The washbasin 150 holds the base 130 at a predetermined height above the floor surface 201 on which the washbasin / hand-washing equipment 200 is arranged, and houses within it the drain trap 1 and floor drain pipe 140 of the drainage system 100, as well as the piping and heating equipment that constitute the discharge device 160.

[0099] 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 a part of the discharge device 160, for discharging hot and cold water into the tank body 111 through a discharge outlet 162, and an operation unit 163 for receiving operations such as opening and closing the discharge pipe 161 and adjusting the temperature of the hot and cold water.

[0100] Applying the drainage system 100 having the drain trap 1 according to the embodiment of the present invention to such a washbasin / hand-washing facility 200 provides the following effects. That is, when installing the washbasin / hand-washing facility 200 according to the embodiment of the present invention in a store, or in a small space such as an entrance or bedroom where the floor surface 201 or other space is limited, it is necessary to use a small-sized washbasin 150. Therefore, the space for installing the drainage system 100 and the discharge device 160 provided in the washbasin / hand-washing facility 200 is also limited. In addition, the tank body 111 installed in the washbasin 150 has a relatively small outer diameter and a steep inner angle, so the flow rate of the drainage from the tank body 111 is likely to be large.

[0101] As described above, the drain trap 1 according to this embodiment functions as a bottle trap that can suppress the expansion of the occupied space and the generation of abnormal noise. Therefore, using the drain trap 1 arranged to share the central axis CA with the tank body 111 and the floor drain pipe 140 and the drain system 100 having the same is particularly suitable when installing the washbasin / hand-washing equipment 200 in a small space.

[0102] 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.

[0103] (6) Other embodiments However, the present invention is not limited to the above-described embodiments.

[0104] In the above embodiment, the drain trap 1 is configured so that the first internal space IS1 to the third internal space IS3 are formed by a cylindrical section formed by a combination of the first sub-cylindrical section 10, the second sub-cylindrical section 20, the third sub-cylindrical section 30, the blocking section 40 and the inlet section 60.

[0105] However, the drain trap 1 according to the embodiment of the present invention may have any configuration that can suppress the expansion of the space occupied below the tank body, and the configuration of the cylindrical body of the present invention is not limited to the configuration of the above embodiment. For example, the cylindrical body of the present invention may be formed of a single member, or may be composed of a combination of any multiple members regardless of the members of the above embodiment. In addition, the specific shape of each member and the specific mode of combination are not limited. For example, the shapes of the first sub-cylindrical body 10, the second sub-cylindrical body 20, and the third sub-cylindrical body 30 in a top view may be commonly rectangular or elliptical, or may be different for each cylindrical body.

[0106] Furthermore, in the above embodiment, in the drain trap 1, the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, the blocking portion 40 and the inlet portion 60 are arranged concentrically while sharing the central axis CA.

[0107] On the other hand, the present invention may be provided with a cylindrical portion having a substantially columnar outer shape, a first internal space into which water from the tank body flows at a first communication position, a second internal space formed around the inner circumference of the first internal space and communicating with the first internal space, and a third internal space formed around the inner circumference of the second internal space and communicating with each of the second internal space and the drain pipe. Therefore, the first sub-cylinder portion 10, the second sub-cylinder portion 20, the third sub-cylinder portion 30, the blocking portion 40, and the inlet portion 60 may be configured to be arranged in such a manner that all or part of them share different central axes.

[0108] Furthermore, the cylindrical portion of the drain trap of the present invention may have a plurality of sub-cylindrical portions, and the plurality of sub-cylindrical portions may be detachably fixed in a direction along the central axis of the third internal space. The plurality of sub-cylindrical portions may be detachably fixed from the side where the tank body is located toward the opposite side, or may be detachably fixed in the opposite direction.

[0109] Therefore, the fixing positions and fixing target members of the first to third sub-cylinder sections 10-30, the blocking section 40 and the inlet section 60 are not limited, and they may be fixed detachably to any position and any member when viewed from the left / right or front / back.

[0110] Furthermore, in the above embodiment, the first to third sub-cylinder portions 10 to 30, the blocking portion 40, the inlet portion 60, and other members are fixed using threads and fitting. Therefore, no separate fixing members are required, improving workability. However, each member may be fixed using a separate fixing member.

[0111] 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]

[0112] 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]

[0113] 1: Drain trap 10: First sub-cylinder part 11:Cylinder body part 11a, 11b: Outer surface, inner surface 11c, 11d: Upper end, lower end 11x, 11y: Upper opening, lower opening 20: Second sub-cylinder section 21:Cylinder body part 21a, 21b: Outer surface, inner surface 21c: Locking convex part 21d, 21e: Upper end, lower end 21x, 21y: Upper opening, lower opening 30: Third sub-cylinder section 30x:Inner cylinder space 31:Cylinder body part 31a, 31b: Outer surface, inner surface 31c, 31c1: placement portion, placement surface 31d: Legs 31e: Space forming part 31f: Locking convex part 31g, 31h: Female thread, male thread 31i, 31j: Upper end, lower end 31w: Concave groove 31x, 31z: Upper opening, lower opening 31y: Slit 40: Occlusion 41, 42: Inner wall, outer wall 41x, 41y: Upper opening, lower opening 43: Recess 50: Cap 51: Cap body 51x, 51y: Upper opening, lower opening 60:Inflow part 60x:Inflow space 61: Upper part of inflow part 61a, 61b: upper and lower parts 61c, 61d: Female thread, male thread 61x :Top opening 62: Legs 63: Lower part of inflow part 63a: Locking protrusion 63b: Locking part 63c: Male thread 63d: Locking surface 64: Slit 100:Drainage system 110: Tank unit 111: Tank body 111x :Aperture 112: Body 112a:Tip 112x: Drain port 112y: opening 120: Drain cover 130: Pedestal 130x: Installation hole 140:Floor drain pipe 150: Washbasin 160:Discharge device 200: Equipment 201: Floor CA: Central axis CS: Communication path IS1~IS3: 1st~3rd internal spaces P1~P6: Packing SW: Seal water

Claims

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, a first internal space having a generally columnar outer shape, into which water from the tank body flows at a first communication position; a second internal space formed around an inner periphery of the first internal space and in communication with the first internal space; and a third interior space formed around an inner periphery of the second interior space and in fluid communication with both the second interior space and the drain pipe; A cylindrical portion forming a second communication position where the first internal space and the second internal space communicate with each other is lower than 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. Drain trap.

2. The first internal space, the second internal space, and the third internal space are arranged along a central axis of the third internal space.

2. The drain trap of claim 1.

3. The first internal space, the second internal space, and the third internal space are arranged to be rotationally symmetric with respect to a central axis of the third internal space.

3. A drain trap according to claim 1 or 2.

4. The first communication position is located on a side facing a peripheral surface of the first internal space.

3. A drain trap according to claim 1 or 2.

5. The cylindrical portion has an outer shape that can be inserted into an opening formed on a base on which the tank body is placed.

3. A drain trap according to claim 1 or 2.

6. The cylindrical portion has a plurality of sub-cylindrical portions, The plurality of sub-cylinder portions are detachably fixed in a direction along the central axis of the third internal space.

3. A drain trap according to claim 1 or 2.

7. The plurality of sub-cylinder portions of the cylinder portion are a first sub-cylinder portion which is one of the plurality of sub-cylinder portions and forms a part of the first internal space, and has a cylindrical first wall into which water from the tank body flows at a first communication position located at one open end side and which communicates with the second internal space at the other open end side; a second sub-cylinder portion which is another of the plurality of sub-cylinder portions and has an outer peripheral surface facing the inner peripheral surface of the first sub-cylinder portion and an inner peripheral surface facing the second internal space, and which has a cylindrical second wall that forms a remaining part of the first internal space and a part of the second internal space; a third sub-cylinder portion which is one of the remaining sub-cylinder portions, the third sub-cylinder portion having an outer peripheral surface facing the inner peripheral surface of the second sub-cylinder portion and an inner peripheral surface facing the third internal space, and which has a cylindrical third wall body which forms the third internal space together with a remaining part of the second internal space; 3. A drain trap according to claim 1 or 2.

8. The tank body, the first sub-cylinder portion, the second sub-cylinder portion, and the third sub-cylinder portion are detachably assembled in a direction along a central axis of the third internal space.

8. The drain trap of claim 7.

9. The inlet portion further includes a connecting portion that is connected to the tank body and a slit that is connected to the first internal space at the first communication position.

3. A drain trap according to claim 1 or 2.

10. A tank body; A base on which the tank body is placed; The drain trap according to claim 1 or 2 is detachably attached to the tank body. Drainage system.

11. A tank body; A base on which the tank body is placed; A method for constructing a drainage system using the drain trap according to claim 1 or 2, which is detachably attached to the tank body, comprising: The base has a through hole formed therein, The method further includes a step of connecting the tank body and the drain trap after placing the tank body on the base through the through hole or before placing the tank body on the base through the through hole. How to install a drainage system.

Images