Drainage structure

Abstract

The present invention provides a drainage structure. The drainage structure (10) comprises: a drainage bend (12) configured to store a water seal (34) and arranged such that an upper portion (41A) is inserted into a through portion (32) provided on a plate-shaped member (22); a transverse pipe (14) connected to a position of the drainage bend (12) on the downstream side of the water seal (34); and a vent pipe (16) connected to a position of the drainage bend (12) on the downstream side of the water seal (34) and above the transverse pipe (14) and including an upper portion (41A) of the drainage bend (12).

Description

Technical Field

[0001] The present disclosure relates to drainage constructions. Background Art

[0002] Japanese Patent Publication No. 2019-44522 discloses a structure in which a waterproof tray used in a location where a washing machine or other water-using device is installed is provided with a drainage bend. In this structure, a hose from the water-using device is connected to a water seal container of the drainage bend (first flow path). In addition, a second flow path is provided, which is used in the event that the hose ruptures, and independently of the first flow path, passes through the cover body and leads to the water seal container. Summary of the invention

[0003] Problem that the invention aims to solve

[0004] However, in the siphon drainage system, even if the drainage flows into such a second flow path, the force of flushing the drainage from the drainage bend to the horizontal pipe is weak due to the low water head. On the other hand, it takes a certain amount of time before the siphon force starts to be generated in the horizontal pipe, and the drainage does not flow much before then. For these reasons, there is a possibility that air will accumulate in the flow path, and the drainage that does not completely enter the second flow path will overflow onto the waterproof tray. As a countermeasure, it is considered to increase the water head, but if only the water head is increased, a larger space is required in the height direction under the floor.

[0005] An object of the present disclosure is to suppress the height of a drain bend and allow drainage that has passed through a water seal of the drain bend to flow smoothly into a siphon drain pipe.

[0006] Solutions for solving problems

[0007] The drainage structure of the first technical solution comprises: a drainage bend, which is configured to store a water seal and is arranged so that its upper portion is inserted into a through portion provided on a plate-shaped member; a siphon drain pipe, which is connected to a position of the drainage bend on the downstream side of the water seal; and a ventilation pipe, which is connected to a position of the drainage bend on the downstream side of the water seal, which is above the siphon drain pipe and includes the upper portion of the drainage bend.

[0008] In this drainage structure, the upper part of the drainage bend is inserted into the through-portion provided in the plate-like component, and a vent pipe is connected to a position including the upper part. Thus, it is possible to suppress interference between the vent pipe and the plate-like component and connect the vent pipe to a higher position of the drainage bend. In addition, thereby, the distance between the vent pipe and the siphon drain pipe in the up-down direction becomes larger, thereby suppressing the situation where the connection position where the drainage bend and the vent pipe are connected is blocked by the drainage that has passed through the water seal. Therefore, the air in the drainage bend that is downstream of the water seal flows toward the vent pipe, suppressing the situation where the air is retained in the drainage bend. In addition, the distance between the vent pipe and the siphon drain pipe in the up-down direction becomes larger, thereby increasing the water head, and thus the drainage that has passed through the water seal becomes easy to flow smoothly to the siphon drain pipe.

[0009] According to the drainage structure of the first technical solution, in the second technical solution, the drainage bend has: an outer shell, to which the siphon drain pipe and the vent pipe are connected; an inner shell, which is arranged on the inner side of the outer shell and can store the water seal; and an inner cylinder, which is arranged on the inner side of the inner shell and forms the water seal, and the lower end of the inner circumferential surface of the siphon drain pipe is located at the height of the bottom of the outer shell.

[0010] In this drainage structure, by making the lower end of the inner peripheral surface of the siphon drainage pipe and the bottom of the casing equal in height, the height of the drainage trap can be further suppressed.

[0011] According to the drainage structure of the first or second technical solution, in a third technical solution, the ventilation pipe and the siphon drainage pipe are connected by a connecting pipe.

[0012] In this drainage structure, even when drainage flows into the vent pipe, the drainage is discharged to the siphon drain pipe through the communication pipe. Therefore, the vent pipe can be drained.

[0013] According to the drainage structure of the third technical solution, in the fourth technical solution, a float valve is provided inside the connecting pipe, and the float valve allows the air in the pipe to pass in both directions between the ventilation pipe and the siphon drain pipe, and allows the drainage to pass from the ventilation pipe to the siphon drain pipe, and prevents the drainage from passing from the siphon drain pipe to the ventilation pipe.

[0014] In this drainage structure, since the float valve is provided inside the connecting pipe, air can be discharged from the siphon drain pipe to the vent pipe through the connecting pipe, and drainage can be prevented from flowing from the siphon drain pipe to the vent pipe through the connecting pipe.

[0015] According to the drainage structure of the third or fourth technical solution, in the fifth technical solution, the ventilation pipe has a lower portion, which is located at the boundary between the portion extending downward from the connection portion where the ventilation pipe and the drainage bend are connected and the portion extending upward again, and the connecting pipe is connected to the lower portion of the ventilation pipe.

[0016] In this drainage structure, since the connecting pipe is connected to the lower part of the vent pipe, even if the drainage flows into the vent pipe, the drainage is easily discharged to the siphon drain pipe through the connecting pipe. Therefore, the vent pipe can be drained effectively.

[0017] According to the drainage structure of the fifth technical solution, in the sixth technical solution, the plate-like component is a floor member, a waterproof tray is provided on the floor member, the drainage bend is connected to the waterproof tray, and when viewed from above, the lower part of the ventilation pipe overlaps with the through-portion.

[0018] In this drainage structure, since the drainage bend is connected to the waterproof tray, the lower part of the ventilation pipe overlaps with the through-hole of the floor member when viewed from above, so the connecting pipe connected to the lower part is located near the drainage bend. Therefore, the connecting pipe that is easy to be attached with dirt can be easily cleaned from the drainage bend side.

[0019] Effects of the Invention

[0020] According to the drainage structure disclosed in the present invention, the height of the drainage bend can be suppressed and the drainage that has passed through the water seal of the drainage bend can be smoothly flowed into the siphon drainage pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional view showing the drainage structure according to the first embodiment.

[0022] Figure 2 It is a cross-sectional view of the float valve showing the interior of the communication pipe.

[0023] Figure 3 It is a cross-sectional view showing the drainage structure according to the second embodiment.

[0024] Figure 4 It is a cross-sectional view showing a drainage structure of a reference example.

[0025] Figure 5 It is a cross-sectional view showing the internal structure of a drain trap of a reference example.

[0026] Figure 6 It is a perspective cross-sectional view showing the internal structure of the housing.

[0027] Figure 7 It is a perspective cross-sectional view showing the internal structure of the housing.

[0028] Figure 8 It is a perspective cross-sectional view showing a state where the wall forming member is removed from the casing.

[0029] Fig. 9 It is a perspective view showing a wall forming member.

[0030] Fig.10 It is a perspective view showing the wall forming member viewed from another direction.

[0031] Fig.11 This is a cross-sectional view showing an example in which the ventilation path is not open on the lower side in the reference example. DETAILED DESCRIPTION

[0032] Hereinafter, the mode for implementing the present disclosure will be described with reference to the accompanying drawings. The components represented by the same reference numerals in the respective drawings refer to the same components. In addition, the descriptions and reference numerals repeated in the embodiments described below may be omitted.

[0033] [First embodiment]

[0034] exist Figure 1 In the embodiment, the drainage structure 10 includes a drainage bend 12 , a horizontal pipe 14 as an example of a siphon drainage pipe, and a vent pipe 16 .

[0035] A floor member 22 as an example of a plate-like member is horizontally provided above the floor 18 of the building 17. An underfloor space 24 is provided between the floor member 22 and the floor 18. A waterproof tray 26 is provided on the floor member 22. Water-using equipment such as a washing machine (not shown) is provided on the waterproof tray 26. The water-using equipment and the drain bend 12 are connected by, for example, a hose 28. By using the waterproof tray 26, even if the hose 28 is broken and drain water leaks, the waterproof tray 26 can catch the drain water and allow it to flow to the drain bend 12. A through portion 32 is formed in the floor member 22. The drain bend 12 is connected to the waterproof tray 26 through the through portion 32.

[0036] The drain bend 12 is configured to store the water seal 34. The drain bend 12 is configured such that the upper portion 41A is inserted into the through portion 32 provided in the floor member 22. Specifically, the drain bend 12 includes an outer shell 41, an inner shell 42, and an inner tube 43. The upper portion 41A refers to a portion of the drain bend 12 that overlaps with the floor member 22 in the horizontal direction when the upper end of the drain bend 12 is connected to the waterproof tray 26.

[0037] The housing 41 is the outermost container in the drain bend 12 to which the horizontal pipe 14 and the vent pipe 16 are connected. The upper portion 41A of the housing 41 is inserted into the through portion 32 of the floor member 22. The housing 41 abuts against the lower surface of the waterproof tray 26. An annular mounting member 36 is arranged on the upper surface side of the waterproof tray 26. A sealing member 38 is provided between the mounting member 36 and the waterproof tray 26. The mounting member 36 can be threadedly coupled to the threaded portion 41B of the housing 41 (see Figure 6 to Figure 8 ), by screwing the mounting member 36 to the threaded portion 41B of the housing 41, the waterproof tray 26 is fluid-tightly sandwiched between the seal 38 and the housing 41. Thus, the housing 41 is fixed to the lower surface of the waterproof tray 26.

[0038] The inner shell 42 is a container that is disposed inside the outer shell 41 and can store the water seal 34. A drainage window 42A that determines the upper limit of the water level of the water seal 34 is formed through the outer peripheral surface of the inner shell 42. The inner shell 42 is detachable from the inner side of the outer shell 41 through an opening (not shown) of the drainage bend 12 from the waterproof tray 26 side.

[0039] The inner cylinder 43 is a cylindrical member disposed inside the inner shell 42 and forming the water seal 34. The inner cylinder 43 can be freely attached and detached from the inner side of the inner shell 42 through an opening (not shown) of the drain bend 12 that opens to the waterproof tray 26. In the drain bend 12, drainage from the water-using equipment flows into the inner side of the inner cylinder 43 and mixes with the water seal 34, and drainage overflowing from the drainage window 42A of the inner shell 42 enters the outer shell 41 and is discharged to the outside of the drain bend 12 through the horizontal pipe 14.

[0040] The horizontal pipe 14 is connected to the drain bend 12 at a position downstream of the water seal 34. The horizontal pipe 14 is horizontally arranged on the floor 18, for example. The bottom of the outer shell 41 of the drain bend 12 is located near the upper surface of the floor 18. As a result, the lower end of the inner peripheral surface of the horizontal pipe 14 is located at the height of the bottom of the outer shell 41. A vertical pipe (not shown) extending downwardly from the building 15 is connected to the downstream end of the horizontal pipe 14. The lower end of the vertical pipe is connected to a drainage riser (not shown) penetrating each floor of the building 15.

[0041] The vent pipe 16 is provided to suppress the destruction of the water seal of the water seal 34 when the siphon force is generated. The vent pipe 16 is connected to a position of the drain bend 12 that is above the horizontal pipe 14 and includes the upper portion 41A of the drain bend 12, in a position downstream of the water seal 34. Specifically, the connection portion 16A of the vent pipe 16 connected to the drain bend 12 is connected to the upper portion 41A of the through portion 32 inserted into the floor member 22 in the housing 41 of the drain bend 12. In addition, the connection portion 16A of the vent pipe 16 may be connected in a manner that straddles the upper portion 41A inserted into the through portion 32 and the portion not inserted into the through portion 32, in other words, the portion lower than the floor member 22. The upper end of the connection portion 16A is within the range of the thickness of the floor member 22. The lower end of the connection portion 16A may also be within the portion lower than the floor member 22, but it is preferable to be within the range of the thickness in order to avoid the drainage retained in the drain bend 12 from entering the vent pipe 16 as much as possible.

[0042] The vent pipe 16 has a lower portion 16D, which is located at the boundary between the portion extending downward from the connection portion 16A of the vent pipe 16 connected to the drain bend 12 (i.e., the descending portion 16B) and the portion extending upward again (i.e., the main pipe portion 16C). When viewed from above, the lower portion 16D of the vent pipe 16 overlaps with the through portion 32. The main pipe portion 16C of the vent pipe 16 is arranged at a height close to the floor member 22 in the underfloor space 24. The main pipe portion 16C has a gradient that rises from the lower portion 16D toward the rising portion 16E. This is to prevent the drainage from flowing to the downstream side of the vent pipe 16 when the drainage flows into the vent pipe 16. The rising portion 16E, which extends upward, is provided at the downstream end of the main pipe portion 16C of the vent pipe 16. The rising portion 16E extends upward through the through portion 40 provided in the floor member 22 and the adjacent wall 44.

[0043] As an example, the vent pipe 16 extends to the height of water-using equipment such as a washing machine in the rising portion 16E, then descends again to enter the underfloor space 24 again, and is connected to, for example, a drainage riser (not shown).

[0044] The vent pipe 16 and the cross pipe 14 are connected by, for example, a connecting pipe 50 extending in the up-down direction. The connecting pipe 50 is connected to the lower portion 16D of the vent pipe 16. In a plan view, since the lower portion 16D of the vent pipe 16 overlaps with the through portion 32, the upper end portion of the connecting pipe 50 connected to the lower portion 16D is also located at a position overlapping with the through portion 32.

[0045] A float valve 52 is provided inside the connecting pipe 50 (see Figure 2The float valve 52 is configured to allow air in the pipe to pass in both directions between the vent pipe 16 and the transverse pipe 14, and to allow drainage to pass from the vent pipe 16 to the transverse pipe 14, but not from the transverse pipe 14 to the vent pipe 16. Specifically, Figure 2 As shown, a float 46 is provided inside the connecting pipe 50. The density of the float 46 is smaller than that of air and larger than that of water. Therefore, the float 46 floats up relative to the drainage and descends relative to the air. A support portion 48 is provided on the lower side of the float 46, and the support portion 48 is used to prevent the float 46 from escaping from the lower side of the connecting pipe 50. Even when the float 46 is placed on the support portion 48, a gap is ensured between the float 46 and the surroundings of the support portion 48. Therefore, the air in the pipe can pass through the vent pipe 16 and the transverse pipe 14 in both directions, and the drainage can flow from the vent pipe 16 to the transverse pipe 14. On the other hand, a valve seat 54 is provided on the upper side of the float 46. When the float 46 is pressed against the valve seat 54 by the drainage flowing from the transverse pipe 14 into the connecting pipe 50, the space between the connecting pipe 50 and the vent pipe 16 is blocked, so that the drainage cannot pass from the transverse pipe 14 to the vent pipe 16.

[0046] (effect)

[0047] This embodiment is constructed as described above, and its function is described below. Figure 1 In the drainage structure 10, the upper portion 41A of the drain bend 12 is inserted into the through portion 32 provided in the floor member 22, and the vent pipe 16 is connected to the position including the upper portion 41A. Thus, the interference between the vent pipe 16 and the floor member 22 can be suppressed and the vent pipe 16 can be connected to a higher position of the drain bend 12. In addition, the distance between the vent pipe 16 and the horizontal pipe 14 in the vertical direction is increased, thereby suppressing the situation that the connection position where the drain bend 12 and the vent pipe 16 are connected is blocked by the drainage that has passed through the water seal 34. Therefore, the air in the drain bend 12 on the downstream side of the water seal 34 flows to the vent pipe 16, and the situation that the air is retained in the drain bend 12 is suppressed. In addition, the distance between the vent pipe 16 and the horizontal pipe 14 in the vertical direction is increased, and the water head is also increased, so that the drainage that has passed through the water seal 34 can easily flow smoothly to the horizontal pipe 14.

[0048] Furthermore, by making the lower end of the inner peripheral surface of the horizontal pipe 14 and the bottom of the casing 41 equal in height, the height of the drain trap 12 can be further reduced.

[0049] Furthermore, since the vent pipe 16 and the lateral pipe 14 are connected by the connecting pipe 50, even when drainage flows into the vent pipe 16, the drainage is discharged to the lateral pipe 14 through the connecting pipe 50. Therefore, the vent pipe 16 can be drained.

[0050] Furthermore, since the float valve 52 is provided inside the connecting pipe 50 , air can be discharged from the lateral pipe 14 to the vent pipe 16 through the connecting pipe 50 , and drainage can be prevented from flowing from the lateral pipe 14 to the vent pipe 16 through the connecting pipe 50 .

[0051] Furthermore, since the connecting pipe 50 is connected to the lower portion 16D of the vent pipe 16, even when drainage flows into the vent pipe 16, the drainage can be easily discharged to the horizontal pipe 14 through the connecting pipe 50. Specifically, drainage flowing from the connecting portion 16A of the vent pipe 16 into the descending portion 16B and drainage flowing into the main pipe portion 16C are both collected in the lower portion 16D and discharged to the horizontal pipe 14 through the connecting pipe 50. Therefore, the vent pipe 16 can be effectively drained.

[0052] Furthermore, since the drain bend 12 is connected to the waterproof tray 26, the lower portion 16D of the vent pipe 16 overlaps with the through portion 32 of the floor member 22 in a plan view, and therefore the connecting pipe 50 connected to the lower portion 16D is located near the drain bend 12. Therefore, the connecting pipe 50, to which dirt is easily attached, can be easily cleaned from the drain bend 12 side.

[0053] As described above, according to the present embodiment, the height of the drain trap 12 can be suppressed and the drain that has passed through the water seal 34 of the drain trap 12 can be smoothly flowed into the lateral pipe 14 (siphon drain pipe).

[0054] [Second embodiment]

[0055] exist Figure 3 In the drainage structure 20 of the present embodiment, a notch 60 opening toward the through-portion 32 is provided in the floor member 22 within the installation range of the waterproof tray 26. The vent pipe 16 is connected to a position including the upper portion 41A of the drain bend 12 through the notch 60. Specifically, the connection portion 16A of the vent pipe 16 connected to the drain bend 12 is connected to the upper portion 41A of the through-portion 32 inserted into the floor member 22 in the housing 41 of the drain bend 12. Alternatively, the connection portion 16A of the vent pipe 16 may be connected in a manner that straddles the upper portion 41A inserted into the through-portion 32 and the portion not inserted into the through-portion 32, in other words, the portion lower than the floor member 22.

[0056] exist Figure 3 In the embodiment, the notch 60 has a shape in which a part of the floor member 22 is removed from the lower surface. Since the upper surface of the floor member 22 including the notch 60 is flat, it is suitable for supporting the waterproof tray 26. In addition, the notch 60 has a flat portion 60A where the floor member 22 is thinned and an inclined portion 60C. The inclined portion 60C is a portion connecting the flat portion 60A and the general portion 60B without the notch 60. In the inclined portion 60C, the thickness of the floor member 22 changes. In addition, in Figure 3In the illustrated example, the notch 60 does not penetrate the floor member 22 in the vertical direction, but may instead be a structure that penetrates the floor member 22 in the vertical direction.

[0057] The descending portion 16B of the vent pipe 16 is arranged along the inclined portion 60C of the notch 60. The vent pipe 16 is arranged horizontally from the connecting portion 16A to the front of the descending portion 16B. In addition, in this section, a gradient may be provided that descends toward the descending portion 16B. In addition, the main pipe portion 16C is arranged at a height close to the floor member 22 and is arranged horizontally to the rising portion 16E. In addition, in this section, a gradient may be provided that descends toward the rising portion 16E.

[0058] The lower portion 16D of the vent pipe 16 is provided at a portion without the notch 60 and is connected to the connecting pipe 50. In other words, the lower portion 16D of the vent pipe 16 is provided at a position deviated from the notch 60, that is, at a position separated from the drain bend 12. Figure 3 In the embodiment, the lower portion 16D of the vent pipe 16 is provided directly below the rising portion 16E. The connecting pipe 50 is also provided directly below the rising portion 16E. A float valve 52 (see FIG. 1 ) similar to that of the first embodiment is provided inside the connecting pipe 50. Figure 2 ).

[0059] Since the other parts are the same as those of the first embodiment, the same parts are denoted by the same reference numerals in the drawings and the description thereof is omitted.

[0060] (effect)

[0061] This embodiment is constructed as described above, and its function is described below. Figure 2 In the drainage structure 20, the vent pipe 16 is connected to the position of the drainage bend 12 including the upper portion 41A of the through portion 32 inserted into the floor member 22 through the notch 60 provided in the floor member 22. Therefore, interference between the vent pipe 16 and the floor member 22 can be suppressed.

[0062] In addition, the lower portion 16D of the vent pipe 16 is provided at a portion without the notch 60 and is connected to the connecting pipe 50. That is, compared with the case where the lower portion 16D of the vent pipe 16 overlaps with the through portion 32 of the floor member 22, the distance from the drain bend 12 to the connecting pipe 50 is longer. Therefore, it is possible to allow drainage to flow into the vent pipe 16 to a certain extent.

[0063] [Reference example]

[0064] exist Figure 4In the drainage structure 30 of the reference example, a ventilation path 70 is formed inside the shell 41 of the drainage bend 12, and the ventilation path 70 is connected to the ventilation pipe 16 and extends upward to the height position of the floor member 22. As an example, the ventilation path 70 is formed between the inner surface of the shell 41 and the first wall portion 71 separated from the inner surface. In addition, the ventilation path 70 extends upward from the inner side of the connection position 41C of the shell 41 with the ventilation pipe 16. The ventilation path 70 and the inner side portion 56 of the connection position 41D of the shell 41 connected to the cross pipe 14 are connected by a communication path 58. The communication path 58 is formed between the inner surface of the shell 41 and the second wall portion 72 separated from the inner surface.

[0065] In the radial direction of the housing 41, the width of the ventilation path 70 is smaller than the width of the communication path 58. The first wall portion 71 and the second wall portion 72 are connected by a slanted wall portion 73 that is slanted with respect to the up-down direction of the housing 41. The first wall portion 71, the slanted wall portion 73, and the second wall portion 72 are integrally formed, for example, as a wall forming member 74. The wall forming member 74 can be removed from the housing 41.

[0066] like Figure 8 As shown, a guide rail 76 extending in the up-down direction, for example, in the shape of a letter L in cross section, is provided on the inner surface of the housing 41. A pair of guide rails 76 are provided. Fig. 9 As shown, the wall forming member 74 is provided with a fitting portion 78 that slides along the guide rail 76 and fits with the guide rail 76. The wall forming member 74 can be attached to and detached from the housing 41 by sliding the fitting portion 78 in the vertical direction along the guide rail 76.

[0067] In addition, the installation direction of the wall forming member 74 on the housing 41 is not limited to the up and down direction, but can also be radial. As an example, it can also be a structure like this: a hook portion (not shown) protruding radially inward is provided on the inner surface of the housing 41, and the fitting portion 78 of the wall forming member 74 is embedded in the hook portion. In this case, the wall forming member 74 can be installed and removed radially relative to the housing 41. In addition, the hook portion can also be formed into a cross-sectional arrow shape or a half arrow shape. In addition, the material of the wall forming member 74 can also be an elastic material such as silicone rubber.

[0068] like Figure 5 to Figure 7 As shown, an eave 64 is provided at the upper end of the ventilation path 70, and the eave 64 is used to block the ventilation path 70 from opening upward. Figure 8 , Fig. 9 As shown, the eaves 64 are integrally formed at, for example, the upper end of the first wall portion 71 via a plurality of support portions 67. The eaves 64 open the ventilation path 70 toward the inner side of the housing 41 in the radial direction.

[0069] exist Figure 4 , Figure 5In the embodiment, a float valve 62 is provided inside the communication path 58. The float valve 62 is configured to allow air in the pipe to pass in both directions between the ventilation path 70 and the inner portion 56, and to allow drainage to pass from the ventilation path 70 to the inner portion 56, and to prevent drainage from passing from the inner portion 56 to the ventilation path 70. Specifically, a float 66 is provided inside the communication path 58. The density of the float 66 is greater than the density of air and less than the density of water. Therefore, the float 66 floats relative to the drainage and descends relative to the air. A support portion 68 is provided on the lower side of the float 66, and the support portion 68 is used to prevent the float 66 from escaping from the lower side of the communication path 58. Even when the float 66 is placed on the support portion 68, a gap is ensured between the float 66 and the surroundings of the support portion 68. Therefore, the air in the pipe can pass in both directions between the ventilation path 70 and the inner portion 56, and drainage can flow from the ventilation path 70 to the inner portion 56. On the other hand, a valve seat 84 is provided above the float 66. When the float 66 is pressed against the valve seat 84 by the drainage flowing from the inner portion 56 into the communication path 58, the communication path 58 and the ventilation path 70 are blocked, so that the drainage does not pass from the inner portion 56 to the ventilation path 70.

[0070] The ventilation path 70 and the inner side portion 56 of the housing 41 at the connection position with the cross pipe 14 are connected by a communication path 58, but it may also be Fig.11 The structure shown in the figure omits the communication path 58 and makes the ventilation path 70 open only on the upper side and not on the lower side. Fig.11 Omitted Figure 5 In this case, the upper end of the ventilation path 70 may be located above the drainage window 42A of the inner shell 42. This is to prevent the drainage that has passed through the water seal 34 and flowed out of the drainage window 42A from flowing into the ventilation path 70.

[0071] Since the other parts are the same as those of the first embodiment or the second embodiment, the same reference numerals are given to the same parts in the drawings, and the description thereof is omitted.

[0072] (effect)

[0073] This reference example is constructed as described above, and its function is described below. Figure 4 , Figure 5In the drainage structure 30, since the ventilation path 70 is formed inside the housing 41 of the drain bend 12, which is connected to the ventilation pipe 16 and extends upward to the height position of the floor member 22, even if the ventilation pipe 16 is arranged at a position that does not interfere with the floor member 22, the ventilation pipe 16 can be prevented from being blocked by the drainage that has passed through the water seal 34. As a result, the air on the downstream side of the water seal 34 in the drain bend 12 can be smoothly replaced and flowed to the ventilation pipe 16. Therefore, the situation in which the air is stagnant at the downstream side of the water seal 34 in the drain bend 12 is suppressed.

[0074] Furthermore, since the ventilation path 70 and the inner portion 56 of the housing 41 at the connection position connected to the cross pipe 14 are connected by the communication path 58, and the float valve 62 is provided inside the communication path 58, air can be discharged from the inner portion 56 to the ventilation path 70 through the communication path 58, and it is possible to suppress the flow of drainage from the inner portion 56 to the ventilation path 70 through the communication path 58. Furthermore, even if drainage flows into the ventilation path 70, the drainage is discharged from the inner portion 56 to the cross pipe 14 through the communication path 58.

[0075] Furthermore, since an eave 64 is provided at the upper end of the ventilation path 70 to block the ventilation path 70 from opening upward, the drainage that has passed through the water seal 34 is prevented from flowing into the ventilation path 70. Thus, the passage of air from the ventilation path 70 to the ventilation pipe 16 is ensured, thereby preventing air from stagnating at a position downstream of the water seal 34 in the drainage bend 12.

[0076] In addition, in the drainage structure 30, the width of the ventilation path 70 is smaller than the width of the communication path 58 in the radial direction of the housing 41. In addition, the first wall portion 71 of the ventilation path 70 and the second wall portion 72 of the communication path 58 are connected by the inclined wall portion 73 inclined with respect to the vertical direction of the housing 41. Therefore, in the drainage bend 12, by providing the inner housing 42 along the inclined wall portion 73 from the first wall portion 71, the capacity of the inner housing 42 can be ensured. Therefore, the height dimension of the drainage bend 12 can be made compact.

[0077] Furthermore, in this drainage structure, since the first wall portion 71, the inclined wall portion 73 and the second wall portion 72 are integrally formed as, for example, a wall forming member 74 that can be removed from the outer shell 41, the drainage bend 12 can be easily cleaned by removing the wall forming member 74 from the outer shell 41.

[0078] [Other embodiments]

[0079] An example of the embodiment of the present disclosure has been described above, but the embodiment of the present disclosure is not limited to the above, and it goes without saying that various modifications other than the above can be made without departing from the gist of the present disclosure.

[0080] Furthermore, the above-described embodiments and reference examples can be combined as appropriate.

Claims

1. A drainage structure, wherein: The drainage structure has: A drain bend, which is configured to store a water seal and is arranged so that an upper portion thereof is inserted into a through portion provided on the plate-shaped member; a siphon drain pipe connected to the drain bend at a position downstream of the water seal; and a vent pipe connected to a position of the drain bend that is located on the downstream side of the water seal and is above the siphon drain pipe and includes the upper portion of the drain bend, The vent pipe has a portion extending downward from a connection portion where the vent pipe is connected to the drain bend and a portion facing upward again, and a boundary between the portion extending downward and the portion facing upward is a lower portion of the vent pipe.

2. The drainage structure according to claim 1, wherein: The drain bend comprises: an outer shell to which the siphon drain pipe and the vent pipe are connected; an inner shell which is arranged inside the outer shell and can store the water seal; and an inner cylinder, which is arranged inside the inner shell and forms the water seal, The lower end of the inner peripheral surface of the siphon drain pipe is located at the height of the bottom of the housing.

3. The drainage structure according to claim 1 or 2, wherein: The ventilation pipe and the siphon drainage pipe are connected by a connecting pipe.

4. The drainage structure according to claim 3, wherein: A float valve is provided inside the connecting pipe, which allows air in the pipe to pass bidirectionally between the ventilation pipe and the siphon drain pipe, and allows drainage to pass from the ventilation pipe to the siphon drain pipe, but does not allow drainage to pass from the siphon drain pipe to the ventilation pipe.

5. The drainage structure according to claim 3, wherein: The communication pipe is connected to the lower portion of the ventilation pipe.

6. The drainage structure according to claim 4, wherein: The communication pipe is connected to the lower portion of the ventilation pipe.

7. The drainage structure according to claim 5, wherein: The plate-like member is a floor member, A waterproof tray is provided on the floor element, The drainage bend is connected to the waterproof tray. The lower portion of the vent pipe overlaps with the through portion in a plan view.

8. The drainage structure according to claim 6, wherein: The plate-like member is a floor member, A waterproof tray is provided on the floor element, The drainage bend is connected to the waterproof tray. The lower portion of the vent pipe overlaps with the through portion in a plan view.

Images