Manifold joints and joint structures

Abstract

To simplify a structure and facilitate the manufacture.SOLUTION: Provided is a collective joint including an upper connecting pipe and a lower connecting pipe. The upper connecting pipe includes a horizontal pipe connecting portion and a bushing 50 connected to the horizontal pipe connecting portion. The bushing 50 has a main pipe 51, a partition wall 52, a blocking portion 53, a packing, and an eccentric ring. The main pipe 51 has a first end fitted into the horizontal pipe connecting portion, and a second end protruding from the horizontal pipe connecting portion. The partition wall 52 is provided within the main pipe 51 and divides the inside of the main pipe 51 into a first space S1 and a second space S2 in a cross section intersecting a central axis of the main pipe 51. The blocking portion 53 blocks the first space S1. The packing is arranged within an end of the second space S2. The eccentric ring is fitted into an end of the first space S1 and the second end of the main pipe 51.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a collective joint and a joint structure.

Background Art

[0002] Conventionally, joints such as those described in Patent Document 1 below are known.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, for this type of joint, simplification of the structure and facilitation of manufacturing are desired.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to simplify the structure and facilitate manufacturing

Means for Solving the Problems

[0006] To solve the above problems, the present invention proposes the following means. The bush according to the present invention includes a main body pipe, a partition wall provided in the main body pipe and partitioning the inside of the main body pipe into a first space and a second space in a cross section intersecting the central axis of the main body pipe, a closing portion for closing the first space, and a protruding portion protruding from the partition wall into the second space.

[0007] A bushing is placed, for example, between a first pipe and a second pipe that have different diameters, to adjust the diameter difference between them and then connect them (note that the first pipe and second pipe here include the fittings). For example, the first pipe and the second pipe can be connected by inserting the main pipe into the first pipe and inserting the second pipe, which has a smaller diameter than the first pipe, into the second space. In this bush, the protruding portion extends from the partition wall into the second space. Therefore, a portion of the outer surface of the second pipe inserted into the second space abuts against the protruding portion, and the second pipe is held within the second space. The overhang extends into the second space. Therefore, by increasing or decreasing the overhang dimension of the overhang into the second space, the cross-sectional area (inner diameter) of the second space can be increased or decreased while fixing the position and shape of the partition wall. Thus, it is possible to form a second space that can accommodate second pipes of various sizes while ensuring design flexibility regarding the position and shape of the partition wall. Incidentally, for example, when manufacturing bushings using a mold, the shape of the first and second spaces (shape of the partition walls) may restrict the direction in which the mold can be removed from the first and second spaces. Due to this restriction, the position of the occlusion section in the central axis direction may be limited depending on the position and shape of the partition walls. In some cases, it may be necessary to form the occlusion section with a separate component from the main pipe and then attach the occlusion section to the main pipe afterwards. However, this bushing increases the design flexibility of the partition wall. Therefore, even while integrally molding the closure section and the main pipe, the position of the closure section in the axial direction is less restricted, and the degree of freedom in the position of the closure section in the axial direction is increased. As a result, for example, the closure section can be positioned at the end of the main pipe in the axial direction. This makes it possible to restrict the inflow of fluid from the outside into the first space while simplifying manufacturing.

[0008] The closure portion may be provided at the end of the main pipe in the direction of the central axis.

[0009] The occlusion is provided at the end of the main pipe in the direction of the central axis. Therefore, it is possible to prevent fluid from flowing into the first space from the side where the occlusion is provided.

[0010] The aforementioned protruding portion may have multiple projections.

[0011] The overhanging portion has multiple protrusions. Therefore, the overhanging portion can be formed by limiting the thickness of the wall in the section where the overhanging portion is provided to the portion corresponding to the protrusions. As a result, the portion of the wall that is thickened can be limited to a narrow area. When injection molding bushings using resin-based or rubber-based materials, shrinkage occurs in areas with high wall thickness, which can easily lead to poor quality. However, by partially creating protruding sections (projections) while maintaining the wall thickness of the partition walls, it is possible to suppress shrinkage during molding. As a result, the manufacturing of bushings can be simplified.

[0012] The protruding portion may be provided on the partition wall only in a portion along the central axis direction of the main pipe.

[0013] The protruding portion is provided only in a portion of the central axis direction of the main pipe. Therefore, when inserting the end of the second pipe into the second space, it is possible to suppress excessive frictional resistance between the second pipe and the protruding portion. This makes it possible to easily insert the second pipe into the second space.

[0014] The joint structure according to the present invention comprises a manifold joint having a plurality of pipe connection parts to which the ends of pipes are connected, and bushings as described above provided in the pipe connection parts.

[0015] A bushing is placed between the pipe connection portion and the pipe body of a manifold joint, which have different diameters, to adjust the diameter difference between them and connect them. For example, the pipe connection portion and the pipe body can be connected by inserting the main pipe into the pipe connection portion of the manifold joint and connecting the pipe body, which has a smaller diameter than the pipe connection portion, into the second space. In this bush, the protruding portion extends from the partition wall into the second space. Therefore, a portion of the outer surface of the pipe inserted into the second space abuts against the protruding portion, and the pipe is held within the second space. The protruding portion extends into the second space. Therefore, by increasing or decreasing the protrusion dimension of the protruding portion into the second space, the cross-sectional area (inner diameter) of the second space can be increased or decreased while fixing the position and shape of the partition wall. Thus, it is possible to form a second space that can accommodate pipes of various sizes while ensuring design flexibility regarding the position and shape of the partition wall. Incidentally, for example, when manufacturing bushings using a mold, the shape of the first and second spaces (shape of the partition walls) may restrict the direction in which the mold can be removed from the first and second spaces. Due to this restriction, the position of the occlusion section in the central axis direction may be limited depending on the position and shape of the partition walls. In some cases, it may be necessary to form the occlusion section with a separate component from the main pipe and then attach the occlusion section to the main pipe afterwards. However, this bushing increases the design flexibility of the partition wall. Therefore, even while integrally molding the closure section and the main pipe, the position of the closure section in the axial direction is less restricted, and the degree of freedom in the position of the closure section in the axial direction can be increased. As a result, for example, the closure section can be positioned at the end of the main pipe in the axial direction. This makes it possible to restrict the inflow of fluid from the outside into the first space while simplifying manufacturing. [Effects of the Invention]

[0016] According to the present invention, it is possible to simplify the structure and facilitate manufacturing. [Brief explanation of the drawing]

[0017] [Figure 1] This is a longitudinal cross-sectional view showing a joint structure according to one embodiment of the present invention. [Figure 2] Figure 1 is an exploded view showing the component configuration of the joint structure. [Figure 3] Figure 1 is a longitudinal cross-sectional view of a bush used in the joint structure shown. [Figure 4] It is a front view of the bush shown in FIG. 3. [Figure 5] It is a perspective view of the bush and the second ring of the joint structure shown in FIG. 1 as seen from below. [Figure 6] It is a longitudinal sectional view of the bush in the first modification of the present embodiment. [Figure 7] It is a longitudinal sectional view of the bush in the second modification of the present embodiment. [Figure 8] It is a front view of the bush in the second modification of the present embodiment. [Figure 9] It is a front view of the bush in the third modification of the present embodiment. [Figure 10] It is a longitudinal sectional view of the bush in the fourth modification of the present embodiment. [Figure 11] It is a longitudinal sectional view of the bush in the fifth modification of the present embodiment. [Figure 12] It is a front view of the bush in the sixth modification of the present embodiment. [Figure 13] It is a longitudinal sectional view of the bush shown in FIG. 12. [Figure 14] It is a longitudinal sectional view of the bush in the seventh modification of the present embodiment.

Mode for Carrying Out the Invention

[0018] Hereinafter, with reference to the drawings, a joint part (joint structure) according to an embodiment of the present invention will be described. The joint part is used, for example, for building drainage and is arranged in a slab through hole formed in a floor slab. As shown in FIGS. 1 and 2, the joint part according to the present embodiment includes a collective joint .

[0019] The collective joint includes an upper connecting pipe , a lower connecting pipe , and an intermediate pipe that connects the upper connecting pipe and the lower connecting pipe . The upper connecting pipe has a vertical pipe connecting part that can be connected to the first vertical pipe [ID=P1], and a horizontal pipe connecting part that protrudes from the side surface of the vertical pipe connecting part and can be connected to the horizontal pipe [ID=P3].

[0020] The vertical pipe connection section 13 is formed in a tubular shape. The first vertical pipe P1 is connected to the first end (upper end) of the vertical pipe connection section 13, and the lower connecting pipe 12 is connected to the second end (lower end) via an intermediate pipe 15. In the illustrated example, a retaining plate 13a is provided on the inner circumferential surface of the vertical pipe connection section 13 at a position that avoids the horizontal pipe connection section 14, but the retaining plate 13a may be omitted. In the following description, the side of the vertical pipe connection section 13 along the central axis O of the vertical pipe connection section 13 that faces the upper connecting pipe 11 is referred to as "upper," and the side that faces the lower connecting pipe 12 is referred to as "lower."

[0021] The horizontal pipe connection portion 14 protrudes from the outer surface of the vertical pipe connection portion 13. In the illustrated example, three horizontal pipe connection portions 14 are arranged at intervals around the central axis O. Two of the three horizontal pipe connection portions 14 are positioned separately, with the central axis O in between. The remaining horizontal pipe connection portion 14 extends in a direction that forms a 90° angle with respect to each of the two aforementioned horizontal pipe connection portions 14 when viewed from above, with respect to the central axis O. Note that the number and direction of extension of the horizontal pipe connection portions 14 are not limited to this configuration and can be changed as desired.

[0022] The upper connecting pipe 11 is obtained, for example, by injecting a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin into the cavity.

[0023] The intermediate pipe 15 is connected to the lower end of the upper connecting pipe 11. In the illustrated example, the upper end of the intermediate pipe 15 is fitted into the lower end of the vertical pipe connecting section 13. It is preferable that the intermediate pipe 15 meets the performance requirements specified in JIS K6741. The intermediate tube 15 contains a resin composition comprising a polyvinyl chloride resin and thermally expandable graphite. The intermediate tube 15 is manufactured, for example, by extrusion molding of the resin composition.

[0024] The intermediate pipe 15 may be a single-layer structure made entirely of a resin composition, or it may be a multi-layer structure consisting of multiple layers. In the case of a multi-layer structure, a configuration in which any of the layers is formed from a resin composition can be adopted. For example, if the intermediate tube 15 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate tube 15 may be configured such that the intermediate layer is made of a resin composition.

[0025] Furthermore, for example, if the intermediate pipe 15 has a three-layer structure, the surface layer, intermediate layer, and inner layer may contain a heat-absorbing agent. The intermediate layer may be configured to be black in color because it contains thermally expandable graphite. In this case, it is preferable to include a coloring agent other than black in the surface layer and inner layer so that they can be distinguished from the intermediate layer. If the intermediate pipe does not contain thermally expandable graphite, a sheet-like fire-resistant material containing thermally expandable graphite may be wrapped around the outer surface of the intermediate pipe 15, or the outer surface of the sound-insulating material covering the intermediate pipe 15 as described later, and the fire-resistant material may be embedded in the slab penetration.

[0026] The lower connecting pipe 12 is tubular in shape, with a smaller diameter at the bottom than at the top. The lower connecting pipe 12 comprises a connecting pipe section 16 connected to the intermediate pipe 15, an inclined pipe section 17 extending downward from the connecting pipe section 16 and gradually decreasing in diameter as it goes downward, and a lower pipe section 18 provided at the lower end of the inclined pipe section 17, to which the second vertical pipe P2 is connected. The intermediate pipe 15 is fitted into the connecting pipe section 16. The second vertical pipe P2 is fitted into the lower pipe section 18. The connecting pipe section 16, the inclined pipe section 17, and the lower pipe section 18 are integrally formed, for example, by injection molding of a synthetic resin material.

[0027] The upper connecting pipe 11 and the lower connecting pipe 12 may be made transparent. This allows the connection status of the upper connecting pipe 11 and the lower connecting pipe 12 to be visually inspected. In addition, flame retardants such as non-thermal-expanding graphite or magnesium hydroxide may be incorporated into the upper connecting pipe 11 and the lower connecting pipe 12.

[0028] The upper end of the upper connecting pipe 11 (the upper end of the vertical pipe connecting section 13) is provided with a first bush 21, a first packing 22, and a first ring 23. The first bush 21 comprises a fitting portion 21a, a support portion 21c, and a swivel vane 21b. The fitting portion 21a is formed in a tubular shape that fits into the vertical pipe connection portion 13. The support portion 21c extends downward from the fitting portion 21a. The swivel vane 21b is provided at the lower end of the support portion 21c. The swivel vane 21b extends around the central axis O.

[0029] The first packing 22 is fitted into the first bush 21. The upper end of the first packing 22 is provided with a lip portion 22a that is in close contact with the outer surface of the first vertical pipe P1. The lower end of the first packing 22 has an upward-facing stepped portion 22b. The end of the first vertical pipe P1 abuts against this stepped portion 22b.

[0030] The first ring 23 is fitted onto the upper end of the first bush 21 from the outside. A flange portion 23a is provided at the upper end of the first ring 23. The flange portion 23a prevents the first packing 22 from detaching from the first bush 21. The first bush 21, the first packing 22, and the first ring 23 can be pre-assembled and integrated before being attached (bonded) to the upper connecting pipe 11.

[0031] The first packing 22 and the second packing 32, described later, are made of rubber materials commonly used in drainage equipment, such as ethylene-propylene-diene rubber (EPDM). The first bush 21, the first ring 23, and the second bush 31 and second ring 33, described later, are each obtained, for example, by injection molding a polyvinyl chloride resin composition containing 0.1 to 1.0 parts by weight of non-expandable graphite per 100 parts by weight of polyvinyl chloride resin. The first bush 21 and the second bush 31 may be made transparent.

[0032] The tip of the horizontal pipe connection section 14 is provided with a second bush 31, a second packing 32, and a second ring 33. The second bush 31 is fitted into the horizontal pipe connection 14 and then bonded to the horizontal pipe connection 14. The tip of the second bush 31 protrudes from the horizontal pipe connection 14.

[0033] The second packing 32 is fitted into the second bush 31 and is in close contact with the outer surface of the horizontal pipe P3. The second ring 33 is fitted from the outside to the tip of the second bush 31. The second ring 33 is provided with a flange portion 33a. The flange portion 33a prevents the second packing 32 from detaching from the second bush 31.

[0034] Of the multiple horizontal pipe connections 14, at least one horizontal pipe connection (pipe connection) 14A uses a bush 50 as the second bush 31, as shown below. As shown in Figures 3 and 4, the bush 50 comprises a main pipe 51, a partition wall 52, a closing portion 53, and a protruding portion 55.

[0035] The main pipe 51 is cylindrical. The first end 51a of the main pipe 51 is fitted into the horizontal pipe connection 14A. The second end 51b of the main pipe 51 protrudes outward from the horizontal pipe connection 14A. Hereinafter, the side of the main pipe 51 along the central axis C1 direction of the first end 51a will be referred to as the first side D1, and the side of the second end 51b will be referred to as the second side D2.

[0036] The partition wall 52 is provided inside the main pipe 51. The partition wall 52 divides the inside of the main pipe 51 into a first space S1 and a second space S2 in a cross section intersecting the central axis C1. As shown in Figure 4, the partition wall 52 is formed in an arc shape with the central axis C2 as the center of curvature when viewed from the direction of the central axis C1. The central axis C2 is parallel to the central axis C1 and offset from the central axis C1. The radius of curvature r2 of the partition wall 52 with the central axis C2 as the center of curvature is smaller than the radius of curvature r1 of the main pipe 51 with the central axis C1 as the center of curvature.

[0037] As shown in Figure 3, the partition wall 52 extends continuously in the direction of the central axis C1. The partition wall 52 has a constant thickness T in the direction intersecting the central axis C2 over a predetermined length of region from the first end 51a to the second end 51b of the main pipe 51. In the following, the portion of the partition wall 52's surface facing the direction in which the partition wall 52 curves and protrudes is referred to as the first surface 52f of the partition wall 52. The portion of the partition wall 52's surface located on the opposite side of the first surface 52f, with the partition wall 52 in between, is referred to as the second surface 52g. The first surface 52f forms the first space S1, and the second surface 52g forms the second space S2.

[0038] As shown in Figure 4, the first space S1 is formed between the first surface 52f of the partition wall 52 and the inner circumferential surface 51f of the main pipe 51 that faces the first surface 52f. The shape of the first space S1 in a cross-section intersecting the central axis C1 is crescent-shaped. The second space S2 is formed between the second surface 52g of the partition wall 52 and the inner circumferential surface 51g of the main pipe 51 that faces the second surface 52g. The shape of the second space S2 in a cross-section perpendicular to the central axis C1 is approximately circular. The central axis C2 is the central axis of the second space S2.

[0039] As shown in Figure 1, the horizontal pipe P31 is inserted into the second space S2. The aforementioned second packing 32 is positioned within the second side D2 end of the second space S2. In the illustrated example, the horizontal pipe P31 inserted into the second space S2 has a smaller diameter than the horizontal pipe P3 connected to the other horizontal pipe connection part 14.

[0040] As shown in Figure 3, the closing portion 53 closes the first space S1. The closing portion 53 is provided integrally with the main pipe 51 at the first end 51a of the main pipe 51. The closing portion 53 is also provided integrally with the first end 52a of the partition wall 52. The closing portion 53 is formed in the shape of a plate oriented in the direction of the central axis C1 (in the illustrated example, a plate shape perpendicular to the central axis C1). The outer edge of the closing portion 53 is connected to the first surface 52f of the partition wall 52 and the inner surface 51f of the main pipe 51.

[0041] As shown in Figure 4, the first space S1 is provided with reinforcing ribs 56 that connect the first surface 52f of the partition wall 52 and the inner circumferential surface 51f of the main pipe 51. Multiple reinforcing ribs 56 (three in the illustrated example) are provided at intervals in the circumferential direction around the central axis C2. The first end of the reinforcing rib 56 located on the first side D1 in the direction of the central axis C1 is connected to the closing portion 53.

[0042] As shown in Figure 3, the partition wall 52 has a protruding wall 54 at the first end 52a located on the first side D1 in the direction of the central axis C1, which protrudes toward the second space S2. The protruding wall 54 is located on the opposite side of the closed portion 53, with the partition wall 52 in between. The tip of the horizontal pipe P31 inserted into the second space S2 abuts against the protruding wall 54.

[0043] The overhang portion 55 extends into the second space S2 from the second surface 52g of the partition wall 52. The overhang portion 55 is equipped with multiple projections 55A. Multiple projections 55A are provided at intervals in the circumferential direction (three in the illustrated example). Each projection 55A is not formed along the entire length of the main pipe 51 in the direction of the central axis C1, but is formed only on a portion of the main pipe 51 in the direction of the central axis C1. In the illustrated example, the projection 55A is formed eccentrically toward the first side D1 in the main pipe 51. The projection 55A extends continuously from the protruding wall 54 in the direction of the central axis C1.

[0044] Of the protrusions 55A, at the tip portion 55s located on the second side D2, the projection height (overhang height) from the second surface 52g of the partition wall 52 gradually decreases from the first side D1 to the second side D2. The end face of the tip portion 55s is inclined with respect to the central axis C2 in a longitudinal cross-sectional view including the central axis C2. As a result, when inserting the horizontal pipe P31 into the second space S2, the horizontal pipe P31 is guided toward the central axis C2 by the protrusions 55A (overhang portion 55).

[0045] As shown in Figure 3, the second end 51b of the main pipe 51 is an enlarged diameter section 59. The enlarged diameter section 59 is larger in diameter than the portion of the main pipe 51 located on the first side D1 relative to the enlarged diameter section 59. As shown in Figure 4, a flat surface 60 is formed in the portion of the enlarged diameter section 59 that faces the partition wall 52 across the central axis C2.

[0046] As shown in Figure 5, the flat surface 60 is formed by cutting out a portion of the outer surface of the enlarged diameter portion 59 (main tube 51). The flat surface 60 is formed by making a portion of the main tube 51 around its central axis C1 thinner than other portions. Note that the flat surface 60 is not limited to a structure formed by actually cutting out a portion of the main tube 51; it may also be formed by designing the mold so that the flat surface 60 is formed during injection molding.

[0047] The outer surface of the main pipe 51 has protrusions 57 and 58. The protrusions 57 and 58 are located on the first side D1 relative to the enlarged diameter portion 59. The protrusion 57 engages with a recess (not shown) formed in the horizontal pipe connection 14A. By engaging with the recess, the protrusion 57 defines the position of the bush 50 relative to the horizontal pipe connection 14A around the central axis C1. The protrusion 58 engages with the recess 73 of the eccentric ring 70, which will be described later. By engaging with the recess, the protrusion 58 defines the position of the eccentric ring 70 relative to the bush 50 around the central axis C1.

[0048] As shown in Figures 1 and 5, the bush 50 uses an eccentric ring 70 as the second ring 33, as shown below. The eccentric ring 70 integrally comprises the main ring 72 and the eccentric flange 71. The second end 51b of the main tube 51 is inserted into the main ring 72. A recess 73 is formed in a part of the circumferential direction of the main ring 72, opening toward the first side D1.

[0049] The eccentric flange 71 is formed in an annular shape, protruding from the inner circumferential surface of the second side D2 end of the main ring 72. The eccentric flange 71 abuts against the second end 51b of the main pipe 51 and presses against the second packing 32. The outer circumferential surface of the eccentric flange 71 is coaxial with the central axis C1. The inner circumferential surface of the eccentric flange 71 is coaxial with the central axis C2 and eccentric with respect to the central axis C1.

[0050] The eccentric ring 70 has a flat portion 74 formed at a position corresponding to the flat surface 60 when the eccentric ring 70 is mounted on the bush 50 (in a state where the eccentric ring 70 is positioned around the central axis C1 by the protrusion 58). The flat portion 74 is formed by cutting out a part of the main ring 72. The portion of the main ring 72 in which the flat portion 74 is formed is missing, and an opening 74a is formed in this portion. The flat surface 60 is exposed to the outside from the flat portion 74. Note that the flat portion 74 is not limited to a structure in which a part of the eccentric ring 70 is actually cut out, but may also be formed by designing the mold so that the flat portion 74 is formed during injection molding.

[0051] As shown in Figure 1, the bush 50 is inserted into the horizontal pipe connection 14A such that the first space S1 is positioned above and the second space S2 is positioned below. That is, with the bush 50 positioned around the central axis C1 relative to the horizontal pipe connection 14A by the protrusion 57, the first space S1 is positioned above the second space S2. With the bush 50 inserted into the horizontal pipe connection 14A (with the bush 50 positioned around the central axis C1 by the protrusion 57), the flat surface 60 and the flat portion 74 are located at the lowest end.

[0052] In the bush 50 described above, the horizontal pipe P31 is inserted into the second space S2 from the second side D2 in the direction of the central axis C1. Here, the protruding portion 55 is provided only at the first end 52a of the partition wall 52. Therefore, on the second side D2, the inner diameter (cross-sectional area) of the second space S2 is larger than the outer diameter of the horizontal pipe P31. Consequently, when starting to insert the horizontal pipe P31 into the second space S2, the horizontal pipe P31 can be easily inserted into the bush 50.

[0053] As the horizontal pipe P31 is inserted into the second space S2 toward the first side D1, and reaches the tip 55s of the protrusion 55A, the tip of the horizontal pipe P31 is guided between the multiple protrusions 55A and the inner circumferential surface 51g of the main pipe 51 by the inclined tip 55s. When the tip of the horizontal pipe P31 abuts against the protruding wall 54, the horizontal pipe P31 is held in place by being sandwiched between the multiple protrusions 55A (overhanging portion 55) and the inner circumferential surface 51g of the main pipe 51.

[0054] Here, the second space S2 is offset downward with respect to the central axis C2 of the horizontal pipe connection 14A. Therefore, the position of the horizontal pipe P31 can be lowered to a position closer to the floor slab S. This makes it easier to ensure a water slope in the horizontal pipe P31, for example. Furthermore, the eccentric ring 70 and bush 50 have flat sections 74 and flat surfaces 60 formed on them. This allows the eccentric ring 70 and bush 50 to be lowered to a position close to the floor slab S. This makes it easier to ensure a water gradient in, for example, the horizontal pipe P31.

[0055] As described above, the bush 50 according to this embodiment is placed between the horizontal pipe connection portion 14A and the horizontal pipe P31 of the manifold joint 10, which have different diameters, and connects them after adjusting the difference in diameter between them. By inserting the main pipe 51 into the horizontal pipe connection portion 14A and inserting the horizontal pipe P31, which has a smaller diameter than the horizontal pipe connection portion 14A, into the second space S2, the horizontal pipe connection portion 14A and the horizontal pipe P31 of the manifold joint 10 can be connected.

[0056] The protruding portion 55 extends into the second space S2. Therefore, by increasing or decreasing the protrusion dimension of the protruding portion 55 into the second space S2, the cross-sectional area (inner diameter) of the second space S2 can be increased or decreased while fixing the position and shape of the partition wall 52. Thus, while ensuring design flexibility regarding the position and shape of the partition wall 52, it is possible to form a second space S2 that can accommodate horizontal pipes P31 of various sizes.

[0057] Incidentally, for example, when manufacturing the bush 50 using a mold, depending on the shape of the first space S1 and the second space S2 (the shape of the partition wall 52), there may be constraints on the direction in which the mold can be removed from the first space S1 and the second space S2. Due to these constraints, depending on the position and shape of the partition wall 52, the position of the closing portion 53 in the direction of the central axis C1 may be restricted. In some cases, it may be necessary to form the closing portion 53 from a separate component from the main pipe 51 and then attach the closing portion 53 to the main pipe 51 afterwards.

[0058] However, this bush 50 increases the design flexibility of the partition wall 52. Therefore, even while integrally molding the closure portion 53 and the main pipe 51, the position of the closure portion 53 in the direction of the central axis C1 is not easily restricted, and the degree of freedom of the position of the closure portion 53 in the direction of the central axis C1 can be increased. As a result, the closure portion 53 can be positioned at the end of the main pipe 51 in the direction of the central axis C1. This makes it possible, for example, to restrict the inflow of fluid from the outside into the first space S1 while simplifying manufacturing.

[0059] The occluding portion 53 is provided at the first end 51a of the main pipe 51. Therefore, it is possible to prevent fluid from flowing into the first space S1 from the first side D1.

[0060] The overhang portion 55 is provided with multiple protrusions 55A. Therefore, the overhang portion 55 can be formed by making the thickness of the portion of the partition wall 52 on which the overhang portion 55 is provided thicker only in the parts corresponding to the protrusions 55A. Thus, the portion of the partition wall 52 that is thickened can be limited to a narrow area. When the bush 50 is injection molded using resin-based or rubber-based materials, shrinkage occurs in areas with greater wall thickness, which can easily lead to poor quality. In contrast, for example, by partially providing a protruding portion 55 (projection 55A) while maintaining the wall thickness of the partition wall 52, it is possible to suppress the occurrence of shrinkage during molding. As a result, it becomes possible to simplify the manufacturing of the bush 50.

[0061] The protruding portion 55 is provided only on a part of the main pipe 51 in the direction of the central axis C1. Therefore, when inserting the end of the horizontal pipe P31 into the second space S2, it is possible to suppress excessive frictional resistance at the contact point between the horizontal pipe P31 and the protruding portion 55. This makes it possible to easily connect the horizontal pipe P31 to the second space S2.

[0062] (Modified example of Embodiment 1) In the above embodiment, only the tip portion 55s of the projection 55A in the direction of the central axis C2 is inclined, and the projection dimension of the projection 55A from the second surface 52g of the partition wall 52 is kept constant in the other portions, but the present invention is not limited to this. As shown in Figure 6, the protrusion 55B constituting the overhang 55 of the bush 50B in this modified example may be formed such that the overhang dimension from the second surface 52g of the partition wall 52 gradually increases along the direction of the central axis C2, from the second side D2 to the first side D1 of the main pipe 51.

[0063] (Second modified example of the embodiment) Furthermore, in the above embodiment, reinforcing ribs 56 are provided on the opposite side of the partition wall 52 from each of the multiple protrusions 55A, but the present invention is not limited thereto. For example, as shown in Figures 7 and 8, the bush 50C of this modified example has a larger inner diameter of the second space S2 than the bush 50 shown in the above embodiment. A projection 55C is provided at the circumferential end 52e of the partition wall 52C (the part where the partition wall 52C merges with the main pipe 51).

[0064] (Third modified example of the embodiment) Furthermore, in the above embodiment, the bush 50 is provided with three protrusions 55A, but there is no limitation on the number of protrusions that can be installed. For example, as shown in Figure 9, the bush 50D of this modified example may be provided with two protrusions 55D spaced apart in the circumferential direction.

[0065] (Fourth modified example of the embodiment) Furthermore, in the above embodiment, the closure portion 53 is provided integrally with the main pipe 51 at the first end 51a of the main pipe 51, but the present invention is not limited thereto. For example, as shown in Figure 10, the upper end of the closing portion 53 may be located in the center of the main pipe 51 in the direction of the central axis C1. In this bush 50E, the closing portion 53 extends toward the first side D1 from top to bottom, and the closing portion 53 is inclined with respect to the direction of the central axis C1. The lower end of the closing portion 53 is connected to the first end 52a of the partition wall 52. As described above, the inclined shape of the occlusion section 53 ensures that even if wastewater enters the first space S1 from the first side D1, the wastewater will not remain in the first space S1 but will be discharged from the first space S1 to the first side D1. In this modified example, the closing portion 53 does not protrude outward along the central axis C1 direction relative to the main pipe 51 or the partition wall 52. Therefore, even if the closing portion 53 is inclined as described above, the size of the bush 50E can be reduced.

[0066] (Modified example of Embodiment 5) Furthermore, as shown in Figure 11, for example, the bush 50F of this modified example may have a closure portion 53 that extends towards the second side D2 as it goes from top to bottom.

[0067] (Sixth variation of the embodiment) In the above embodiment, the protruding portion 55 is provided with a plurality of projections 55A, but the present invention is not limited thereto. For example, as shown in Figures 12 and 13, the bush 50G of this modified example may be formed by a single projection 55G. The circumferential size of the projection 55G is smaller than the circumferential size of the projection 55A described above, for example, about half the circumferential size of the entire partition wall 52.

[0068] (Seventh modified example of the embodiment) Furthermore, as shown in Figure 14, for example, a weight-reducing portion S3 may be formed in the partition wall 52, such as the bush 50H of this modified example. The weight-reducing portion S3 is provided in the circumferential portion of the partition wall 52 where the protrusion 55G (overhang 55) is provided. The weight-reducing portion S3 opens toward the first side D1 in the direction of the central axis C1. In the weight-reducing portion S3, the size in the radial direction, which is perpendicular to the central axis C2, gradually increases toward the first side D1. In other words, in this modified example, the partition wall 52 is divided into two radial parts toward the first side D1 from the central part in the direction of the central axis C1. Of the two divided partition wall 52, the outer portion located radially outward forms the first space S1, and the inner portion located radially inward forms the second space S2. The inner portion protrudes radially inward compared to the other circumferential portion that forms the second space S2.

[0069] (Eighth variant of the embodiment) The upper connecting pipe 11 and the lower connecting pipe 12 can also be fitted with sound-insulating covers (not shown) that cover their respective outer surfaces.

[0070] For example, a sheet (not shown) may be wrapped around the upper connecting pipe 11 as a sound-insulating cover. Such a sheet may be formed in sheet form from an elastic material such as modified asphalt, elastomer, rubber, polyolefin resin, or soft polyvinyl chloride resin. The sheet may also contain inorganic materials such as calcium carbonate or barium sulfate, metal sheets such as iron or lead, or metal powder.

[0071] Furthermore, for example, the lower connecting pipe 12 may be provided with a pipe body made of sound-insulating material as a sound-insulating cover (not shown). The sheet body is integrally molded by, for example, injection molding, pressure molding, blow molding, vacuum molding, etc. The sheet body is formed from an elastic resin material such as an olefin-based material (a resin composition containing 300 to 600 parts by weight of inorganic filler per 100 parts by weight of olefin-based resin).

[0072] The inorganic fillers mentioned above are not particularly limited, but examples include silica, diatomaceous earth, alumina, zinc oxide, titanium oxide, calcium oxide, magnesium oxide, iron oxide, tin oxide, antimony oxide, ferrites, calcium hydroxide, magnesium hydroxide, aluminum hydroxide, basic magnesium carbonate, calcium carbonate, magnesium carbonate, zinc carbonate, barium carbonate, donnite, hydrotalcite, calcium sulfate, barium sulfate, gypsum fiber, calcium silicate, talc, clay, mica, montmorillonite, bentonite, activated clay, sepiolite, imogolite, sericite, glass fiber, glass beads, silica-based balloons, aluminum nitride, boron nitride, silicon nitride, carbon black, graphite, carbon fiber, carbon balloons, charcoal powder, various metal powders, potassium titanate, magnesium sulfate, lead zirconate titanate, aluminum borate, molybdenum sulfide, silicon carbide, stainless steel fiber, zinc borate, various magnetic powders, slag fiber, fly ash, dewatered sludge, etc. Of these, calcium carbonate is preferred as the inorganic filler due to the balance between weight and cost. These may be used individually or in a mixture of two or more.

[0073] The olefin resin is not particularly limited, but examples include low-density polyethylene, high-density polyethylene, linear low-density polyethylene, atactic polypropylene, isotactic polypropylene, syndiotactic polypropylene, and poly-αolefin. In particular, those with a density of 0.87 to 0.93 g / cm³ are available. 3 Polyethylene is preferred as the olefin resin. Its density is 0.87 g / cm³. 3 If it is less than 0.93 g / cm³, the strength of the tube is insufficient. 3 If it exceeds this value, there is a risk of buckling when the pipe is flattened (when an axial force is applied to the pipe). Also, the flexural modulus of the olefin resin is 100 to 3000 kg / cm 2In that case, the strength and processability are sufficient. The tube body may be made of a material other than the olefin-based material, for example, polyvinyl chloride resin, polystyrene resin, ABS resin, AS resin, elastomer material, etc. may be used.

[0074] Furthermore, the technical scope of the present invention is not limited to the embodiments and their modifications, and various modifications can be made without departing from the spirit of the present invention.

[0075] The overhang 55 is provided only at the first end 52a of the partition wall 52. However, it may also be provided only at the central part along the central axis C1 of the partition wall 52. For example, it may be provided along the entire length of the partition wall 52. The flat surface 60 and the flat portion 74 are optional.

[0076] The bush 50 may also be provided at other pipe connection points, such as the vertical pipe connection point 13. The bushings 50 may be provided at multiple horizontal pipe connection points 14.

[0077] Furthermore, without departing from the spirit of the present invention, the components in the above embodiments may be replaced with well-known components as appropriate, and the above-described modifications may be combined as appropriate. [Explanation of symbols]

[0078] 1. Joint section (joint structure) 10 Manifold joint 14A Horizontal pipe connection (pipe connection) 50A, 50B, 50C, 50D, 50E, 50F, 50G, 50H bushings 51 Main pipe 52, 52C Partition Wall 55 Protruding section 55A, 55B, 55C, 55D, 55G protrusion C1 center axis P31 Horizontal tube (tube body) S1 1st space S2 2nd space

Claims

1. A manifold fitting comprising an upper connecting pipe positioned above and a lower connecting pipe positioned below, The upper connecting pipe comprises a horizontal pipe connecting portion and a bush connected to the horizontal pipe connecting portion into which the horizontal pipe is inserted. The bush comprises a main pipe, a partition wall, a closing portion, a packing, and an eccentric ring having an opening into which the horizontal pipe is inserted. The main pipe has a first end that fits into the horizontal pipe connection and a second end that protrudes from the horizontal pipe connection. The partition wall is provided inside the main pipe and divides the inside of the main pipe into a first space and a second space into which the horizontal pipe is inserted, in a cross section intersecting the central axis of the main pipe. The closing portion closes the first end side of the first space, The packing is positioned within the end of the second space and is coaxial with the central axis of the second space. The eccentric ring is fitted to the end of the first space and the second end of the main tube. The eccentric ring comprises a main ring fitted to the second end of the main pipe, and an eccentric flange formed in an annular shape that protrudes inward from the end of the main ring and has the opening into which the horizontal pipe is inserted. The opening of the eccentric flange is coaxial with the central axis of the second space and eccentric with respect to the central axis of the main ring. The main pipe is provided with an overhanging portion attached to the partition wall, The protruding portion projects downward from the inner surface of the partition wall and is formed toward the central axis side of the upper connecting pipe in the central axis direction of the second space. The main pipe, the partition wall, the closing portion, and the protruding portion are integrally molded. A protruding wall extending downward from the end of the aforementioned overhang is provided. Manifold joint.

2. A manifold fitting comprising an upper connecting pipe positioned above and a lower connecting pipe positioned below, The upper connecting pipe comprises a horizontal pipe connecting portion and a bush connected to the horizontal pipe connecting portion into which the horizontal pipe is inserted. The bush comprises a main pipe, a partition wall, a closing portion, a packing, and an eccentric ring having an opening into which the horizontal pipe is inserted. The main pipe has a first end that fits into the horizontal pipe connection and a second end that protrudes from the horizontal pipe connection. The partition wall is provided inside the main pipe and divides the inside of the main pipe into a first space and a second space into which the horizontal pipe is inserted, in a cross section intersecting the central axis of the main pipe. The upper end of the closing portion is connected to the inner surface of the main pipe between the first end and the second end, The lower end of the aforementioned closure portion is connected to the end of the partition wall on the central axis side of the upper connecting pipe, The packing is positioned within the end of the second space and is coaxial with the central axis of the second space. The eccentric ring is fitted to the end of the first space and the second end of the main tube. The eccentric ring comprises a main ring fitted to the second end of the main pipe, and an eccentric flange formed in an annular shape that protrudes inward from the end of the main ring and has the opening into which the horizontal pipe is inserted. The opening of the eccentric flange is coaxial with the central axis of the second space and eccentric with respect to the central axis of the main ring. The main pipe is provided with an overhanging portion attached to the partition wall, The protruding portion projects downward from the inner surface of the partition wall and is formed toward the central axis side of the upper connecting pipe in the central axis direction of the second space. The main pipe, the partition wall, the closing portion, and the protruding portion are integrally molded. A protruding wall extending downward from the end of the aforementioned overhang is provided. Manifold joint.

3. A manifold fitting comprising an upper connecting pipe positioned above and a lower connecting pipe positioned below, The upper connecting pipe comprises a horizontal pipe connecting portion and a bush connected to the horizontal pipe connecting portion into which the horizontal pipe is inserted. The bush comprises a main pipe, a partition wall, a closing portion, a packing, and an eccentric ring having an opening into which the horizontal pipe is inserted. The main pipe has a first end that fits into the horizontal pipe connection and a second end that protrudes from the horizontal pipe connection. The partition wall is provided inside the main pipe and divides the inside of the main pipe into a first space and a second space into which the horizontal pipe is inserted, in a cross section intersecting the central axis of the main pipe. The closing portion closes the first end side of the first space, The packing is positioned within the end of the second space and is coaxial with the central axis of the second space. The eccentric ring is fitted to the end of the first space and the second end of the main tube. The eccentric ring comprises a main ring fitted to the second end of the main pipe, and an eccentric flange formed in an annular shape that protrudes inward from the end of the main ring and has the opening into which the horizontal pipe is inserted. The opening of the eccentric flange is coaxial with the central axis of the second space and eccentric with respect to the central axis of the main ring. The main body ring has an opening toward the end of the upper connecting pipe on the central axis side, and has a recess formed therein that engages with a protrusion formed on the outer surface of the main body pipe. Manifold joint.

4. A manifold fitting comprising an upper connecting pipe positioned above and a lower connecting pipe positioned below, The upper connecting pipe comprises a horizontal pipe connecting portion and a bush connected to the horizontal pipe connecting portion into which the horizontal pipe is inserted. The bush comprises a main pipe, a partition wall, a closing portion, a packing, and an eccentric ring having an opening into which the horizontal pipe is inserted. The main pipe has a first end that fits into the horizontal pipe connection and a second end that protrudes from the horizontal pipe connection. The partition wall is provided inside the main pipe and divides the inside of the main pipe into a first space and a second space into which the horizontal pipe is inserted, in a cross section intersecting the central axis of the main pipe. The upper end of the closing portion is connected to the inner surface of the main pipe between the first end and the second end, The lower end of the aforementioned closure portion is connected to the end of the partition wall on the central axis side of the upper connecting pipe, The packing is positioned within the end of the second space and is coaxial with the central axis of the second space. The eccentric ring is fitted to the end of the first space and the second end of the main tube. The eccentric ring comprises a main ring fitted to the second end of the main pipe, and an eccentric flange formed in an annular shape that protrudes inward from the end of the main ring and has the opening into which the horizontal pipe is inserted. The opening of the eccentric flange is coaxial with the central axis of the second space and eccentric with respect to the central axis of the main ring. The main body ring has an opening toward the end of the upper connecting pipe on the central axis side, and has a recess formed therein that engages with a protrusion formed on the outer surface of the main body pipe. Manifold joint.

5. A joint structure comprising: a first vertical pipe; a second vertical pipe; a manifold joint according to any one of claims 1 to 4 for connecting the first vertical pipe and the second vertical pipe; and a horizontal pipe connected to the manifold joint.

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