Sealing member, lift, piping system, and construction method of piping system

Abstract

To provide a sealing member that reduces insertion force when inserting piping.SOLUTION: A sealing member 50A for sealing between a masu body part having an opening formed on an outer surface and piping arranged in the opening of the masu body part comprises: an annular member 51A; a large-diameter part 52A that is provided in a portion of one side D1 along a central axis line O3 of the annular member on an inner peripheral surface of the annular member; a small-diameter part 53A that is provided in the portion of the other side D2 closer to the central axis line than the large diameter part and located along the central axis line on the inner peripheral surface of the annular member, and has an inner diameter smaller than that of the large-diameter part; and a stepped part 54A that is formed so as to be continuous between the large-diameter part and the small-diameter part.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present invention relates to a sealing member , Lifting, piping system, and construction method of piping system and pertains thereto.

Background Art

[0002] Conventionally, a sealing member for sealing between a sewage riser main body (riser main body) having an opening formed on its outer surface and a pipe disposed at the opening of the sewage riser main body is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the sealing member of Patent Document 1, the insertion force when inserting the pipe into the sealing member is high. There is room for improvement in this sealing member.

[0005] The present invention has been made in view of such problems, and provides a sealing member with a reduced insertion force when inserting a pipe material, this and a riser equipped with the sealing member , piping system, and construction method of piping system for installing this sealing member with the aim of providing the same.

Means for Solving the Problems

[0006] In order to solve the above problems, the present invention proposes the following means. The sealing member of the present invention is a sealing member that seals between a kettle body portion having an opening formed on an outer surface thereof and a pipe disposed in the opening of the kettle body portion, and includes an annular member, a large-diameter portion provided on one side portion along a central axis of the annular member on an inner peripheral surface of the annular member, a small-diameter portion provided on the other side portion along the central axis of the annular member on the inner peripheral surface of the annular member and having an inner diameter smaller than that of the large-diameter portion, and a stepped portion formed to be continuous between the large-diameter portion and the small-diameter portion. The inner diameter of the sealing member is constant or decreases from one end on the one side to the other end on the other side, and the inner diameter of the sealing member at the one end on the one side is larger than the inner diameter of the sealing member at the other end on the other side. In the cross-section including the central axis, the inner peripheral surface of the stepped portion is a curved surface that protrudes radially outward. It is characterized by this.

[0007] In this invention, the sealing member is fixed to a peripheral edge portion of the opening in the kettle body portion such that the other side faces the inside of the kettle body portion. The pipe is inserted into the annular member of the sealing member from the outside of the kettle body portion. The pipe passes through the large-diameter portion, and a tip end of the pipe is locked to a stepped portion continuous between the large-diameter portion and the small-diameter portion. Since the inner diameter of the small-diameter portion is smaller than the inner diameter of the large-diameter portion, when the pipe is locked to the inner peripheral surface of the stepped portion, the small-diameter portion is pushed outward in the radial direction around the stepped portion, and the inner diameter of the small-diameter portion increases. The amount of change in which the inner diameter of this small-diameter portion increases becomes larger as it goes toward the other side. For this reason, it becomes easier to insert the pipe into the small-diameter portion. Therefore, the insertion force when inserting the pipe into the sealing member can be reduced. Also, when manufacturing the sealing member by injection molding using a mold, there is no undercut portion on the inner peripheral surface of the sealing member. For this reason, the entire inner peripheral surface of the sealing member can be formed by the core of the mold, and the core can be pulled out to one side from the sealing member. Also, when inserting the pipe along the inner peripheral surface of the stepped portion at a constant speed, the speed at which the inner diameter of the small-diameter portion increases can be made faster when the pipe moves from the inner peripheral surface of the stepped portion to the inner peripheral surface of the small-diameter portion than when the pipe is first locked to the inner peripheral surface of the stepped portion. Thereby, initially, the inner diameter of the small-diameter portion can be carefully increased, and then, the inner diameter of the small-diameter portion can be quickly increased.

[0008] Also, in the sealing member, in the cross-section, the inner peripheral surface of the large-diameter portion and the inner peripheral surface of the stepped portion may be smoothly continuous. By "smoothly continuous" as used herein, it means that in the cross-section, the angle formed by the tangent line at the end on the stepped portion side of the inner peripheral surface of the large-diameter portion and the tangent line at the end on the large-diameter portion side of the inner peripheral surface of the stepped portion is 10° or less. In this invention, even when inserting the pipe into the sealing member, the inner diameter of the small-diameter portion does not change. From the step of inserting the tip of the pipe into the large-diameter portion, as the pipe is inserted, the inner diameter of the small-diameter portion increases, and the switching to the step of inserting the tip of the pipe into the stepped portion is smoothly performed. Therefore, when the inner diameter of the small-diameter portion starts to increase, it is possible to suppress the rapid increase in the inner diameter of the small-diameter portion.

[0009] Also, in the sealing member, in the cross-section, the connecting portion between the inner peripheral surface of the stepped portion and the inner peripheral surface of the small-diameter portion may protrude so as to be convex toward the radially inner side. In this invention, the tip of the pipe can be more reliably locked to the inner peripheral surface of the stepped portion.

[0010] The sealing member of the present invention is a sealing member that seals between a bowl main body portion having an opening formed on an outer surface thereof and a pipe disposed in the opening of the bowl main body portion, and includes an annular member, a large-diameter portion provided on one side portion along the central axis of the annular member on the inner peripheral surface of the annular member, a small-diameter portion provided on the other side portion along the central axis of the annular member on the inner peripheral surface of the annular member, the inner diameter of which is smaller than that of the large-diameter portion, a stepped portion formed to connect between the large-diameter portion and the small-diameter portion, and a convex portion provided on the inner peripheral surface of the small-diameter portion and protruding radially inward. The inner diameter of the sealing member is constant or decreases from the one end to the other end, and the inner diameter of the sealing member at the one end is larger than the inner diameter of the sealing member at the other end.

[0011] In this invention, the sealing member is fixed to the peripheral edge of the opening in the bowl main body portion such that the other side faces the inside of the bowl main body portion. The pipe is inserted into the annular member of the sealing member from the outside of the bowl main body portion. The pipe passes through the large-diameter portion, and the tip of the pipe is locked to the stepped portion connecting between the large-diameter portion and the small-diameter portion. Since the inner diameter of the small-diameter portion is smaller than the inner diameter of the large-diameter portion, when the pipe is locked to the inner peripheral surface of the stepped portion, the small-diameter portion is pushed outward in the radial direction around the stepped portion, and the inner diameter of the small-diameter portion increases. The amount of change in the inner diameter of the small-diameter portion increasing as it goes toward the other side. Therefore, it becomes easier to insert the pipe into the small-diameter portion. Accordingly, the insertion force when inserting the pipe into the sealing member can be reduced. In addition, when the sealing member is manufactured by injection molding using a mold, there is no undercut portion on the inner peripheral surface of the sealing member. Therefore, the entire inner peripheral surface of the sealing member can be formed by the core of the mold, and the core can be pulled out to one side from the sealing member. Further, when the outer peripheral surface of the pipe comes into contact with the convex portion, the outer peripheral surface of the pipe is separated from the portion adjacent to the convex portion in the direction along the central axis on the inner peripheral surface of the small-diameter portion. Therefore, the contact area between the small-diameter portion and the pipe is reduced as compared with the case where the convex portion is not provided on the inner peripheral surface of the small-diameter portion and the outer peripheral surface of the pipe contacts over the entire length in the direction along the central axis on the inner peripheral surface of the small-diameter portion. Accordingly, the insertion force when inserting the pipe into the sealing member can be further reduced.

[0012] Further, the ladle of the present invention is characterized by including the sealing member described in any one of the above, and the ladle main body portion in which the annular member of the sealing member is fixed to the peripheral edge of the opening in the ladle main body portion. In this invention, the ladle can be configured by using a sealing member that reduces the insertion force when inserting the pipe. Further, the pipe system of the present invention is characterized in that the ladle described above and the lateral pipe are connected via the sealing member described in any one of the above.

[0013] Further, the construction method of the pipe system of the present invention is characterized by having a step of forming an opening in the ladle, a step of installing the sealing member described in any one of the above in the opening, and a step of inserting the lateral pipe into the opening.

Advantages of the Invention

[0014] The sealing member of the present invention , ladle, pipe system, and construction method of pipe system can reduce the insertion force when inserting the pipe.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Embodiment for Carrying Out the Invention

[0016] Hereinafter, an embodiment of the lift according to the present invention will be described with reference to FIGS. 1 to 11 when the lift is a rain lift. As shown in FIG. 1, the rain lift 1 of the present embodiment is connected to the vertical pipe 101 of a house (building) 100 via a bent pipe portion 102 and a horizontal rainwater pipe (pipe) 103A. The rain lift 1 is buried in the ground G together with the bent pipe portion 102 and the horizontal rainwater pipe 103A and the like. The rain lift 1 is further connected to a sewer pipe (not shown) via a horizontal rainwater pipe (pipe) 103B. Hereinafter, when the horizontal rainwater pipes 103A and 103B are not distinguished, they are collectively referred to as the horizontal rainwater pipe 103. The same applies to the openings 12A and 12B, the position indicators 14A, 14B, and 14C, etc. described later.

[0017] The horizontal rainwater pipes 103 are each arranged along a horizontal plane while having an appropriate water gradient. The horizontal rainwater pipes 103 and the rain lift 1 constitute a rainwater pipe system 2. On the other hand, the sewage generated in the drainage facilities 106 such as toilets arranged indoors in the house 100 is drained from the vertical pipe 107 through the horizontal drainage pipe 108 and via a confluence box (not shown) to the main sewer pipe 109.

[0018] For example, the horizontal rainwater pipe 103A is a pipe with a nominal diameter of 50 (outer diameter of 60 mm). The horizontal rainwater pipe 103B is a pipe with a nominal diameter of 75 (outer diameter of 89 mm). As the material of the horizontal rainwater pipes 103, hard vinyl chloride pipes are preferably used. The horizontal rainwater pipes 103A and 103B have different outer diameters from each other. In addition to the horizontal rainwater pipes 103A and 103B, pipes with a nominal diameter of 100 (outer diameter of 114 mm), which are not shown in the drawings, are used as the horizontal rainwater pipes 103. These horizontal rainwater pipes 103 with nominal diameters of 50, 75, and 100 are the pipes planned to be used in the rainwater riser 1.

[0019] As shown in FIGS. 2 and 3, the rainwater riser 1 includes a riser main body 10, a riser pipe receiving port 25 disposed at the upper part of the riser main body 10, a sedimentation part 30 disposed at the lower part of the riser main body 10, a locking part 40 disposed at the riser pipe receiving port 25, a basket 45 disposed in the sedimentation part 30, and the sealing members 50A and 50B of the present embodiment. The riser main body 10, the riser pipe receiving port 25, and the locking part 40 are each formed in a cylindrical shape, and the sedimentation part 30 and the basket 45 are each formed in a bottomed cylindrical shape. The axes of the riser main body 10, the riser pipe receiving port 25, the sedimentation part 30, the locking part 40, and the basket 45 are disposed on an axis O1 that is a common axis. Hereinafter, the direction orthogonal to the axis O1 is referred to as the radial direction, and the direction of orbiting around the axis O1 is referred to as the circumferential direction. The radial direction is the radial direction of the riser main body 10 and the like. The rainwater riser 1 is arranged such that the axis O1 is along the vertical direction.

[0020] The riser main body 10 includes a main body outer peripheral wall 11 on which openings 12A and 12B for disposing the ends of the horizontal rainwater pipes 103 are formed on the outer surface, and a continuous part 13 connected to the riser pipe receiving port 25. The main body outer peripheral wall 11 is formed in a cylindrical shape. As shown in FIG. 3, the openings 12A and 12B are formed so as to face each other across the axis O1 on the main body outer peripheral wall 11. The detailed positions where the openings 12 are formed will be described later. Note that at the time of manufacturing the rainwater riser 1, the openings 12 are not formed in the rainwater riser 1, and as will be described later, the openings 12 are formed in the rainwater riser 1 at the construction site.

[0021] As shown in FIGS. 2 and 3, on the outer peripheral surface of the main body outer peripheral wall 11, a plurality (three in this embodiment) of position indicators 14A, 14B, 14C, a plurality of outer diameter indicators 15A, 15B, 15C, and a plurality of angle indicators 16A, 16B, 16C are formed. Note that the number of the position indicators 14, the outer diameter indicators 15, and the angle indicators 16 formed is not particularly limited respectively. The position indicator 14 represents the vertical position of the centers of the openings 12A and 12B. In this embodiment, the position indicator 14 is an annular reference line extending in the circumferential direction. The position indicator 14 is formed over the entire circumference of the main body outer peripheral wall 11. For example, the position indicator 14 is formed as a groove recessed radially inward from the outer peripheral surface of the main body outer peripheral wall 11. Note that the shape of the position indicator 14 is not limited to a groove shape, and it may be formed as a protrusion protruding radially outward from the outer peripheral surface of the main body outer peripheral wall 11 or the like.

[0022] The position indicators 14 are arranged at intervals in the vertical direction. Among the position indicators 14A, 14B, 14C, the position indicator 14A is arranged at the uppermost position, and the position indicator 14C is arranged at the lowermost position. The position indicator 14B is arranged between the position indicator 14A and the position indicator 14C. The vertical distance between the position indicator 14 and the locking portion 40 will be described later.

[0023] The outer diameter indicator 15 represents the outer diameter of the horizontal rainwater pipe 103. In this example, the outer diameter indicator 15 is the nominal diameter of the horizontal rainwater pipe 103. The nominal diameter of the horizontal rainwater pipe 103 corresponds to the outer diameter of the horizontal rainwater pipe 103. For example, the outer diameter indicator 15A has a nominal diameter of 50 and represents an outer diameter of 60 mm. The outer diameter indicator 15B has a nominal diameter of 75 and represents an outer diameter of 89 mm. Note that the outer diameter indicator 15 is not limited to the nominal diameter of the horizontal rainwater pipe 103, and may be the outer diameter of the horizontal rainwater pipe 103 or the like. The outer diameter indicators 15A, 15B, and 15C are respectively arranged beside the position indicators 14A, 14B, and 14C corresponding to them. More specifically, the outer diameter indicator 15A is arranged immediately above the position indicator 14A. The outer diameter indicators 15B and 15C are respectively arranged immediately above the position indicators 14B and 14C. The outer diameter indicator 15A is preferably arranged at a position where the correspondence with the position indicator 14A is easy to understand. For this reason, it is preferable to arrange the outer diameter indicator 15A immediately near or on the position indicator 14A. The same applies to the outer diameter indicators 15B and 15C.

[0024] The plurality of angular indicators 16A represent the circumferential positions at the position indicator 14A. As shown in FIGS. 2 and 4, in this embodiment, the plurality of angular indicators 16A are depressions formed on the position indicator 14A. The plurality of angular indicators 16A are formed at equal angles around the axis O1. The plurality of angular indicators 16A are formed on the position indicator 14A. Note that a part of the plurality of angular indicators 16 is removed from the outer peripheral wall 11 of the main body when forming the opening 12. In FIG. 4, the removed angular indicator 16A is indicated by a two-dot chain line M1. In this example, during manufacturing, the angular indicators 16A are formed at 45-degree intervals around the axis O1, and eight angular indicators 16A are formed on the outer peripheral surface of the outer peripheral wall 11 of the main body. The plurality of angular indicators 16B and 16C are formed in the same manner as the plurality of angular indicators 16A. The plurality of angular indicators 16A, 16B, and 16C are arranged with their circumferential positions aligned. That is, in the plan view of the rainwater riser 1, the positions of the angular indicators 16B and 16C coincide with the position of the angular indicator 16A.

[0025] The opening 12A is circular when viewed so as to face the opening 12A. As shown in FIGS. 3 and 4, the inner diameter of the opening 12A is larger than the outer diameter of the horizontal rainwater pipe 103A. The end of the horizontal rainwater pipe 103A is arranged in the opening 12A. The center of the circle of the opening 12A coincides with the vertical center of the position indicator 14A. As shown in FIG. 4, in this example, the center of the circle of the opening 12A coincides with one of the plurality of angle indicators 16A (hereinafter also referred to as the angle indicator 16A1). As described above, the angle indicator 16A1 has been removed from the outer peripheral wall 11 of the main body when forming the opening 12A.

[0026] The opening 12B is circular when viewed so as to face the opening 12B. As shown in FIGS. 3 and 4, the inner diameter of the opening 12B is larger than the outer diameter of the horizontal rainwater pipe 103B. The end of the horizontal rainwater pipe 103B is disposed in the opening 12B. The center of the circle of the opening 12B coincides with the vertical center of the position indicator 14B. As shown in FIG. 4, in this example, the center of the circle of the opening 12B coincides with one of the plurality of angle indicators 16B (hereinafter also referred to as the angle indicator 16B1). During the manufacture of the rainwater riser 1, the angle indicator 16B1 was an indicator arranged so as to face the angle indicator 16A1 among the plurality of angle indicators 16B. As described above, the angle indicator 16B1 has been removed from the outer peripheral wall 11 of the main body when forming the opening 12B.

[0027] In the plan view shown in FIG. 4, the horizontal rainwater pipes 103A and 103B are linearly connected by the rainwater riser 1. For example, the horizontal rainwater pipe 103B may be disposed at a position indicated by a two-dot chain line M2 in FIG. 4, and the horizontal rainwater pipes 103A and 103B may be connected by the rainwater riser 1 so as to bend the flow of rainwater by 90 degrees. The opening for the horizontal rainwater pipe 103B is formed around the angle indicator 16B located at the circumferential center of the angle indicator 16A1 and the angle indicator 16B1 in the plan view. By using the angle indicator 16 in this way, the opening 12 centered on the position dividing the entire circumference of the outer peripheral wall 11 of the main body into a plurality of parts can be easily formed in the outer peripheral wall 11 of the main body.

[0028] As shown in FIG. 3, the connecting portion 13 is formed in an annular shape. The connecting portion 13 extends radially inward from the upper end of the outer peripheral wall 11 of the main body. The connecting portion 13 is formed over the entire circumference of the outer peripheral wall 11 of the main body.

[0029] The rising pipe receiving port 25 includes a pipe body 26 and a receiving member 27. The pipe body 26 is formed in a cylindrical shape and is arranged coaxially with the axis O1. The outer diameter of the pipe body 26 is smaller than the inner diameter of the outer peripheral wall 11 of the main body. The inner peripheral edge of the connecting portion 13 is connected to the middle portion of the axis O1 on the outer peripheral surface of the pipe body 26. The receiving member 27 is formed in an annular shape. The receiving member 27 extends radially inward from the lower end of the pipe body 26. The internal space of the rising pipe receiving port 25 and the internal space of the lifting main body portion 10 communicate with each other. A rising pipe 115 is connected to the rising pipe receiving port 25. The rising pipe 115 is arranged along the vertical direction, and the lower end portion of the rising pipe 115 is arranged inside the pipe body 26. The lower surface of the rising pipe 115 contacts the receiving member 27 and is supported by the receiving member 27 from below.

[0030] The mud storage portion 30 is formed in a bottomed cylindrical shape. The mud storage portion 30 is arranged coaxially with the axis O1. The outer diameter of the mud storage portion 30 is smaller than the inner diameter of the outer peripheral wall 11 of the main body. The internal space of the mud storage portion 30 and the internal space of the lifting main body portion 10 communicate with each other. A connecting portion 31 is fixed to the mud storage portion 30. The connecting portion 31 includes a flange portion 32 and a connecting piece 33. The flange portion 32 is formed in an annular shape. The flange portion 32 extends radially outward from the upper end of the mud storage portion 30. The connecting piece 33 is formed in a cylindrical shape. The connecting piece 33 extends downward from the radially outer end of the flange portion 32. The connecting piece 33 is arranged inside the lower end portion of the outer peripheral wall 11 of the main body and is fixed to the outer peripheral wall 11 of the main body by an adhesive or the like. In plan view, the mud storage portion 30 is arranged inside the outer edge of the lifting main body portion 10 (outer peripheral wall 11).

[0031] The locking portion 40 is formed in a cylindrical shape and is arranged coaxially with the axis O1. That is, the locking portion 40 is arranged over the entire circumference around the axis O1. The outer surface 40a on the radially outer side of the locking portion 40 is a curved surface parallel to the axis O1. The outer diameter of the locking portion 40 and the outer diameter of the mud collecting portion 30 are about the same as each other. The locking portion 40 extends downward from the inner peripheral edge of the receiving member 27. The locking portion 40 is arranged on the receiving member 27 so as to be located above the position indicator 14. The locking portion 40 is within the lifting body portion 10 and is arranged radially inward of the outer peripheral wall 11 of the main body. The vertical position of the lower end of the locking portion 40 is constant regardless of the circumferential position.

[0032] For each of the position indicators 14, the vertical distance between the vertical center of the position indicator 14 and the locking portion 40 is smaller than half of the outer diameter of the lateral drainage pipe 103 represented by the outer diameter indicator 15 corresponding to the position indicator 14. Specifically, the vertical distance LA between the vertical center of the position indicator 14A and the locking portion 40 is smaller than half of the outer diameter (60 mm) of the lateral drainage pipe 103A represented by the outer diameter indicator 15A corresponding to the position indicator 14A. That is, the distance LA is a value smaller than 30 mm, for example, 25 mm. The distance LA is smaller than the radius of the lateral drainage pipe 103A arranged at the opening 18a. The vertical distance LB between the vertical center of the position indicator 14B and the locking portion 40 is smaller than half of the outer diameter (89 mm) of the lateral drainage pipe 103B represented by the outer diameter indicator 15B corresponding to the position indicator 14B. That is, the distance LB is a value smaller than 44.5 mm, for example, 40 mm. The same applies to the distance LC corresponding to the position indicator 14C.

[0033] The smallest distance LA among the distances LA, LB, and LC is smaller than the radius of the lateral drainage pipe 103 for rainwater with the smallest outer diameter among the lateral drainage pipes 103 for rainwater. The lateral drainage pipes 103 for rainwater are each in contact with the surface 40a of the locking portion 40. In the present embodiment, the locking portion 40 is disposed at the riser pipe receiving port 25. However, as indicated by the dashed two-dot line M4 in FIG. 3, the locking portion may be disposed at the flange portion 32 of the connecting portion 31. In this case, the locking portion 40 is disposed so as to be positioned below the position indicator 14. Also, the locking portion may be disposed either on the riser main body portion 10 or on the sediment accumulation portion 30.

[0034] The vertical length L1 of the locking portion 40 is preferably equal to or less than the wall thickness L2 of the rainwater horizontal pipe 103A disposed at the opening 12A. More preferably, the length L1 is equal to or less than the wall thickness of the thinnest wall among the plurality of horizontal pipes 103. The length of the rainwater horizontal pipe 103 disposed in the riser main body portion 10 is preferably 150 mm or less. That is, when the horizontal pipe 103 contacts the surface 40a of the locking portion 40, the length of the horizontal pipe 103 disposed in the riser main body portion 10 is preferably 150 mm or less.

[0035] The basket 45 is for carrying out sediment, leaves, etc. accumulated in the rainwater riser 1 to the outside from the rainwater riser 1. The basket 45 includes a container body 46 and a handle 47. The container body 46 is formed in a bottomed cylindrical shape and is disposed in the sediment accumulation portion 30. The handle 47 is formed, for example, in a shape in which a shaft-like member is curved upward so as to protrude. Each end portion in the longitudinal direction of the handle 47 is connected to the upper end portion of the container body 46, respectively. The upper end portion of the handle 47 reaches the receiving member 27 of the riser pipe receiving port 25. The outer diameter of the basket 45 is preferably 50 mm or more. The outer diameter of the basket 45 is smaller than the inner diameters of the riser pipe receiving port 25 and the locking portion 40, respectively. The basket 45 can be removed upward with respect to the sediment accumulation portion 30 and taken out to the outside of the rainwater riser 1 through the riser main body portion 10 and the riser pipe receiving port 25.

[0036] The rising body portion 10, the rising pipe receiving port 25, and the locking portion 40 are integrally formed of a resin material such as polyvinyl chloride or polypropylene that can be cut by the opening means described below. The sedimentation portion 30 and the basket 45 can be formed of the same material as the rising body portion 10 and the like. The outer diameter of the rainwater riser 1, that is, the outer diameter of the rising body portion 10, is preferably 350 mm or less.

[0037] As shown in FIGS. 3 and 4, the sealing member 50A is fixed to the peripheral edge of the opening 12A in the rising body portion 10. Similarly, the sealing member 50B is fixed to the peripheral edge of the opening 12B in the rising body portion 10. The sealing members 50A and 50B differ only in their outer and inner diameters. Specifically, the outer diameter of the sealing member 50B is larger than the outer diameter of the sealing member 50A, and the inner diameter of the sealing member 50B is larger than the inner diameter of the sealing member 50A. Hereinafter, the sealing member 50A will be described. The sealing member 50A seals between the main body outer peripheral wall 11 of the rising body portion 10 and the horizontal rainwater pipe 103A.

[0038] As shown in FIGS. 5 and 6, the sealing member 50A has an annular member 51A, a large-diameter portion 52A, a small-diameter portion 53A, a stepped portion 54A, a convex portion 55A, a first flange portion 56A, and a second flange portion 57A. In addition, in FIG. 5, a mold 120 used when manufacturing the sealing member 50A by injection molding is also shown. The annular member 51A, the large-diameter portion 52A, the small-diameter portion 53A, the stepped portion 54A, and the convex portion 55A are each formed in an annular shape. Here, the central axis of the annular member 51A is referred to as the central axis O3. On one side of FIG. 5, a cross section by a plane including the central axis O3 of the sealing member 50A is shown. Hereinafter, in the description of the sealing member 50A, the direction orthogonal to the central axis O3 is referred to as the radial direction, and the direction of orbiting around the central axis O3 is referred to as the circumferential direction. As shown in FIG. 6, the outer peripheral surface on the other side D2 along the central axis O3 of the annular member 51A is a tapered surface 51aA that is inclined so as to gradually reduce the diameter toward the other side D2. Hereinafter, in the direction along the central axis O3, the side opposite to the other side D2 is referred to as the one side D1.

[0039] The large-diameter portion 52A, the small-diameter portion 53A, and the step portion 54A are arranged coaxially with the central axis O3 on the inner peripheral surface of the annular member 51A. The large-diameter portion 52A is provided at a portion on one side D1 of the inner peripheral surface of the annular member 51A. A curved surface 52aA is formed at an end portion on one side D1 of the large-diameter portion 52A so as to be convex in a direction between the one side D1 and the radially inner side. The small-diameter portion 53A is provided at a portion on the other side D2 of the inner peripheral surface of the annular member 51A, which is on the other side of the large-diameter portion 52A. The inner diameter of the small-diameter portion 53A (the largest portion of the inner diameter of the small-diameter portion 53A) is smaller than the inner diameter of the large-diameter portion 52A (the smallest portion of the inner diameter of the large-diameter portion 52A). In the present embodiment, the inner diameter of the small-diameter portion 53A gradually decreases as it goes toward the other side D2.

[0040] As shown in FIG. 7, the step portion 54A is formed so as to be continuous between the large-diameter portion 52A and the small-diameter portion 53A. In the cross section shown in FIG. 7, the inner peripheral surface of the step portion 54A is a curved surface that is convex toward the radially outer side. The inner peripheral surface of the large-diameter portion 52A and the inner peripheral surface of the step portion 54A are smoothly continuous. The so-called smooth continuity here means that, in the cross section, the angle formed by the tangent line L5 at the end on the step portion 54A side of the inner peripheral surface of the large-diameter portion 52A and the tangent line L6 at the end on the large-diameter portion 52A side of the inner peripheral surface of the step portion 54A is 20° or less. Note that the formed angle includes 0°. The formed angle is more preferably 10° or less. The connecting portion 60A between the inner peripheral surface of the step portion 54A and the inner peripheral surface of the small-diameter portion 53A protrudes so as to be convex toward the radially inner side. As shown in FIGS. 6 and 8, the convex portion 55A is provided at an intermediate portion in the direction along the central axis O3 on the inner peripheral surface of the small-diameter portion 53A. The convex portion 55A protrudes toward the radially inner side. The cross-sectional shape of the convex portion 55A is triangular with a sharp tip on the radially inner side.

[0041] As shown in FIGS. 5 and 6, the first flange portion 56A and the second flange portion 57A are each formed in an annular shape. The flange portions 56A and 57A are arranged coaxially with the central axis O3 on the outer peripheral surface of the annular member 51A. The first flange portion 56A is arranged at the end on one side D1 of the outer peripheral surface of the annular member 51A. The surface of the first flange portion 56A facing the other side D2 is flat. At the radially outer end of the surface of the first flange portion 56A facing the one side D1, a curved surface 56aA is formed which is curved convexly in the direction between the one side D1 and the radially outer side. The second flange portion 57A is arranged on the other side D2 with respect to the first flange portion 56A. The second flange portion 57A is arranged at the middle portion of the annular member 51A along the direction of the central axis O3. The outer diameter of the second flange portion 57A is smaller than the outer diameter of the first flange portion 56A. Therefore, it is easy to insert the second flange portion 57A into the opening 12A of the main body portion 10. The surface of the second flange portion 57A facing the one side D1 is flat. At the radially outer end of the surface of the second flange portion 57A facing the other side D2, a curved surface 57aA is formed which is curved convexly in the direction between the other side D2 and the radially outer side.

[0042] The annular member 51A is a member excluding the large-diameter portion 52A, the small-diameter portion 53A, the stepped portion 54A, the convex portion 55A, the first flange portion 56A, and the second flange portion 57A from the sealing member 50A.

[0043] The inner diameter of the sealing member 50A configured as described above is constant or becomes smaller as it goes from the one side D1 to the other side D2. In other words, the inner diameter of the sealing member 50A changes without increasing as it goes from the one side D1 to the other side D2. As shown in FIG. 8, the outer edge 55aA of the convex portion 55A on the other side D2 is parallel to the central axis O3 or approaches the central axis O3 as it goes toward the other side D2. When the outer edge 55aA is parallel to the central axis O3, the inner diameter of the sealing member 50A is constant in the range where the outer edge 55aA is provided along the direction of the central axis O3. When the outer edge 55aA approaches the central axis O3 as it goes toward the other side D2, the inner diameter of the sealing member 50A gradually becomes smaller as it goes from the one side D1 to the other side D2. As shown in FIG. 6, the inner diameter at one end D1 of the sealing member 50A (the end at one end D1 of the large-diameter portion 52A) is larger than the inner diameter at the other end D2 of the sealing member 50A (the end at the other end D2 of the small-diameter portion 53A).

[0044] The sealing member 50A is formed of an elastomer or the like. Note that the sealing member 50A may be formed of a synthetic rubber such as styrene-butadiene rubber (SBR). Generally, an elastomer is harder (more difficult to deform) than a synthetic rubber. When manufacturing the sealing member 50A by injection molding with an elastomer, since the elastomer is relatively hard, it is difficult to provide an undercut portion in the sealing member 50A.

[0045] As shown in FIG. 5, the annular member 51A of the sealing member 50A is fixed to the peripheral edge of the opening 12A in the main body outer peripheral wall 11 of the bucket main body portion 10. Specifically, the sealing member 50A is arranged such that the other side D2 faces the inside of the bucket main body portion 10, and the peripheral edge of the opening 12A in the main body outer peripheral wall 11 is sandwiched by the first flange portion 56A and the second flange portion 57A. As shown in FIGS. 3 and 4, the end portion of the horizontal rainwater pipe 103A is arranged inside the sealing member 50A. Similarly, the sealing member 50B is fixed to the peripheral edge of the opening 12B in the main body outer peripheral wall 11 of the bucket main body portion 10. The end portion of the horizontal rainwater pipe 103B is arranged inside the sealing member 50B.

[0046] Next, the process of manufacturing the sealing member 50A will be described. For example, the sealing member 50A is manufactured by injection molding using a mold. As shown in FIG. 5, the mold 120 used for injection molding has a core 121 and a cavity 122. The core 121 forms the shape on the inner peripheral surface side of the sealing member 50A. The cavity 122 is divided into a first cavity 122A and a second cavity 122B by a dividing surface S including the central axis O3. After molding the sealing member 50A by injection molding using the mold 120, the core 121 is pulled out from the sealing member 50A to one side D1. The cavities 122A and 122B are pulled out from the sealing member 50A in a direction orthogonal to the split surface S. Through the above steps, the mold 120 is removed from the sealing member 50A, and the sealing member 50A is manufactured.

[0047] Next, a construction method for the rainwater riser of connecting the rainwater horizontal pipe 103 to the rainwater riser 1 during manufacture will be described. First, in the opening process (step S1), an opening 12 is formed at a desired position in the circumferential direction of the riser body portion 10 of the rainwater riser 1 using an opening means such as a hole saw. At this time, a position index 14 and an angle index 16 that are the centers of the opening 12 are determined according to the outer diameter of the rainwater horizontal pipe 103 connected to the rainwater riser 1 and the direction in which the rainwater horizontal pipe 103 is connected. For example, when connecting the rainwater horizontal pipe 103A with a nominal diameter of 50 and the rainwater horizontal pipe 103B with a nominal diameter of 75 to the rainwater riser 1 in a straight line across the rainwater riser 1, the openings 12A and 12B are formed as follows.

[0048] That is, as the center of the opening 12A formed on the outer peripheral wall 11 of the main body, the vertical center of the position index 14A corresponding to the outer diameter index 15A representing the nominal diameter of 50 is selected. At this time, if the position of one of the plurality of angle indexes 16A, that is, the angle index 16A1, is selected, the circumferential positioning becomes easy. The tip of the drill of an opening means such as a hole saw with an outer diameter larger than 60 mm (for example, 70 mm) is applied to the position on the angle index 16A1 of the position index 14A. The opening means is rotated about the drill by an impact driver or the like to form the opening 12A on the outer peripheral wall 11 of the main body. As the center of the opening 12B formed on the outer peripheral wall 11 of the main body, the vertical center of the position index 14B corresponding to the outer diameter index 15B representing the nominal diameter of 75 is selected. At this time, if the position of one of the plurality of angle indexes 16B, that is, the angle index 16B1, is selected, the opening 12B is formed so as to face the opening 12A. When the opening process S1 is completed, the process proceeds to step S2.

[0049] Next, in the piping step (step S2), a horizontal rainwater pipe 103A is inserted into the opening 12A, and a horizontal rainwater pipe 103B is inserted into the opening 12A. Before inserting the horizontal rainwater pipe 103, sealing members 50A and 50B are respectively fixed to the openings 12A and 12B. At this time, it is preferable to apply a lubricant to the inner peripheral surfaces of the sealing members 50A and 50B. Then, the horizontal rainwater pipe 103A is inserted into the sealing member 50A, and the horizontal rainwater pipe 103B is inserted into the sealing member 50A. Details of the step of inserting the horizontal rainwater pipe 103A into the sealing member 50A will be described in detail later. When the piping step S2 is completed, all steps of the construction method of the rainwater lift are completed, and the horizontal rainwater pipe 103 is connected to the rainwater lift 1.

[0050] Here, details of the step of inserting the horizontal rainwater pipe 103A into the sealing member 50A will be described. As shown in FIG. 9, the horizontal rainwater pipe 103A is inserted into the annular member 51A of the sealing member 50A from the outside of the lift main body 10. The horizontal rainwater pipe 103A passes through the large-diameter portion 52A, and as shown in FIG. 10, the tip of the horizontal rainwater pipe 103A is locked to a step portion 54A that connects between the large-diameter portion 52A and the small-diameter portion 53A. Since the inner diameter of the small-diameter portion 53A is smaller than the inner diameter of the large-diameter portion 52A, when the horizontal rainwater pipe 103A is locked to the inner peripheral surface of the step portion 54A, the small-diameter portion 53A is pushed outward in the radial direction around the step portion 54A, and the inner diameter of the small-diameter portion 53A increases. The amount of change in the inner diameter of the small-diameter portion 53A increases as it goes toward the other side D2. Therefore, it becomes easier to insert the horizontal rainwater pipe 103A into the small-diameter portion 53A. Therefore, in the sealing member 50A of the present embodiment, the insertion force when inserting the horizontal rainwater pipe 103A into the sealing member 50A can be reduced.

[0051] In the cross-section shown in FIG. 7, the inner peripheral surface of the stepped portion 54A is a curved surface that protrudes radially outward. Therefore, when inserting the horizontal rainwater pipe 103A along the inner peripheral surface of the stepped portion 54A at a constant speed, the speed at which the inner diameter of the small-diameter portion 53A increases can be made faster when the horizontal rainwater pipe 103A moves from the inner peripheral surface of the stepped portion 54A to the inner peripheral surface of the small-diameter portion 53A than when the horizontal rainwater pipe 103A is first locked to the inner peripheral surface of the stepped portion 54A. As a result, the inner diameter of the small-diameter portion 53A can be carefully increased at first and then quickly increased.

[0052] In the cross-section, the inner peripheral surface of the large-diameter portion 52A and the inner peripheral surface of the stepped portion 54A are smoothly continuous. Therefore, even when the horizontal rainwater pipe 103A is inserted into the sealing member 50A, the inner diameter of the small-diameter portion 53A does not change. From the step of inserting the tip of the horizontal rainwater pipe 103A into the large-diameter portion 52A to the step of inserting the tip of the horizontal rainwater pipe 103A into the stepped portion 54A where the inner diameter of the small-diameter portion 53A increases as the horizontal rainwater pipe 103A is inserted, the switching is smoothly performed. Therefore, when the inner diameter of the small-diameter portion 53A starts to increase, it is possible to suppress the rapid increase in the inner diameter of the small-diameter portion 53A.

[0053] In the cross-section, the connecting portion 60A between the inner peripheral surface of the stepped portion 54A and the inner peripheral surface of the small-diameter portion 53A protrudes so as to be convex toward the radially inner side. Thereby, the tip of the horizontal rainwater pipe 103A can be more reliably locked to the inner peripheral surface of the stepped portion 54A. The sealing member 50A has a convex portion 55A. As shown in FIG. 11, when the outer peripheral surface of the horizontal rainwater pipe 103A comes into contact with the convex portion 55A, the outer peripheral surface of the horizontal rainwater pipe 103A is separated from the portion adjacent to the convex portion 55A in the direction along the central axis O3 on the inner peripheral surface of the small-diameter portion 53A. For this reason, the convex portion 55A is not provided on the inner peripheral surface of the small-diameter portion 53A, and the contact area between the small-diameter portion 53A and the horizontal rainwater pipe 103A is reduced as compared with the case where the outer peripheral surface of the horizontal rainwater pipe 103A contacts over the entire length in the direction along the central axis O3 on the inner peripheral surface of the small-diameter portion 53A. Therefore, the insertion force when inserting the horizontal rainwater pipe 103A into the sealing member 50A can be further reduced.

[0054] The inner diameter of the sealing member 50A is constant or decreases from one side D1 to the other side D2. For this reason, when manufacturing the sealing member 50A by injection molding using the mold 120, there is no undercut portion on the inner peripheral surface of the sealing member 50A. Therefore, the entire inner peripheral surface of the sealing member 50A can be formed by the core 121 of the mold 120, and the core 121 can be pulled out from the sealing member 50A to one side D1. Further, the rainwater riser 1 of the present embodiment has a riser main body portion 10 and a sealing member 50A. Therefore, the rainwater riser 1 can be configured using the sealing member 50A with the insertion force reduced when inserting the horizontal rainwater pipe 103A.

[0055] As described above, one embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and modifications, combinations, deletions, etc. of the configuration within the scope not departing from the gist of the present invention are also included. For example, in the above embodiment, the number of openings 12 formed in the riser main body portion 10 may be one or three or more. In the cross section shown in FIG. 7, the inner peripheral surface of the stepped portion 54A may be linear or the like. In the cross section, there may be a step between the inner peripheral surface of the large-diameter portion 52A and the inner peripheral surface of the stepped portion 54A. In the cross section, the connecting portion between the inner peripheral surface of the stepped portion 54A and the inner peripheral surface of the small-diameter portion 53A may be smoothly continuous.

[0056] The sealing member may not have the convex portion 55A, the first flange portion 56A, and the second flange portion 57A. In this case, for example, the sealing member is fixed to the peripheral edge of the opening 12A in the bucket main body portion 10 by an adhesive or the like. A portion that becomes an undercut may be formed in the sealing member. The rainwater bucket 1 may not include the pipe receiving port 25, the sediment portion 30, the locking portion 40, and the basket 45. In addition, in this embodiment, although the bucket is the rainwater bucket 1, the bucket may be a sewage bucket for sewage (wastewater, drainage) or the like.

Explanation of Reference Numerals

[0057] 1 Rainwater bucket (bucket) 10 Bucket main body portion 12A, 12B Openings 50A, 50B Sealing members 51A Annular member 52A Large-diameter portion 53A Small-diameter portion 54A Step portion 55A Convex portion 60A Connection portion D1 One side D2 The other side O3 Central axis

Claims

1. A sealing member that seals between a rice cooker body portion having an opening formed on an outer surface thereof and a pipe disposed in the opening of the rice cooker body portion, an annular member, a large-diameter portion provided on one side portion along the central axis of the annular member on the inner peripheral surface of the annular member, a small-diameter portion provided on the other side portion along the central axis of the annular member on the inner peripheral surface of the annular member, which is smaller in inner diameter than the large-diameter portion, a stepped portion formed so as to be continuous between the large-diameter portion and the small-diameter portion, comprising, the inner diameter of the sealing member is constant or decreases from one end on the one side to the other end on the other side, the inner diameter at one end on the one side of the sealing member is larger than the inner diameter at the other end on the other side of the sealing member, In a cross-section including the central axis, the inner peripheral surface of the stepped portion is a curved surface that protrudes radially outward. A sealing member.

2. In the cross-section, the inner peripheral surface of the large-diameter portion and the inner peripheral surface of the stepped portion are smoothly continuous. The sealing member according to Claim 1.

3. In the cross-section, the connecting portion between the inner peripheral surface of the stepped portion and the inner peripheral surface of the small-diameter portion protrudes so as to be convex radially inward. The sealing member according to Claim 1 or 2.

4. A sealing member that seals between a rice cooker body portion having an opening formed on an outer surface thereof and a pipe disposed in the opening of the rice cooker body portion, an annular member, a large-diameter portion provided on one side portion along the central axis of the annular member on the inner peripheral surface of the annular member, a small-diameter portion provided on the other side portion along the central axis of the annular member on the inner peripheral surface of the annular member, which is smaller in inner diameter than the large-diameter portion, a stepped portion formed so as to be continuous between the large-diameter portion and the small-diameter portion, a convex portion provided on the inner peripheral surface of the small-diameter portion and protruding radially inward, comprising, the inner diameter of the sealing member is constant or decreases from one end on the one side to the other end on the other side, the inner diameter at one end on the one side of the sealing member is larger than the inner diameter at the other end on the other side of the sealing member. A sealing member.

5. The sealing member according to any one of Claims 1 to 4, and the rice cooker body portion in which the annular member of the sealing member is fixed to the peripheral edge portion of the opening in the rice cooker body portion, comprising a rice cooker.

6. The rice cooker according to Claim 5, a lateral draw pipe, and A piping system in which they are connected via the sealing member according to any one of Claims 1 to 4.

7. A step of forming an opening upward, A step of installing the sealing member according to any one of claims 1 to 4 in the opening, A step of inserting a horizontal pipe into the opening, A method for constructing a piping system, comprising the above steps.

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