Collective joint and piping structure

Abstract

To provide a collective joint having suppressed sound to be generated by liquid flowing thereinto.SOLUTION: The collective joint includes a joint body having an axial line O1 arranged along the vertical direction, and a connected blade unit 51 fitted to the upper end of the joint body, the connected blade unit having a vertical pipe connection part 53 having a lower end 53b fitted to the inner peripheral face at the upper end of the joint body, a protruded part 54 provided on the inner peripheral face at the lower end of the vertical pipe connection part so as to be protruded to the radial inside, a blade support part extending from the lower end of the vertical pipe connection part to the lower side, a turning blade 56 provided on the inner peripheral face of the blade support part, and protruded strip parts 57, 58 provided on the blade support part. In view in the vertical direction, the protruded strip parts are arranged at the same position as an end 54a on the radial inside of the protruded part or on the radial outside further than the end.SELECTED DRAWING: Figure 2

Description

[Technical field]

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

[0002] Conventionally, in order to provide a collective joint with swirl vanes, it is known to configure the collective joint by fitting a joint body and a connecting vane unit that are separately formed together (see, for example, Patent Document 1). The connecting blade unit has a vertical pipe connecting portion, a protruding portion, a blade supporting portion, and a swirl blade.

[0003] The lower end of the vertical pipe connection part is fitted into the inner peripheral surface of the upper end of the joint body. The protrusion part is provided on the inner peripheral surface of the lower end of the vertical pipe connection part so as to protrude radially inward. The blade support part extends downward from the lower end of the vertical pipe connection part. The swirl blades are provided on the inner peripheral surface of the blade support part so as to protrude radially inward. The lower end of the vertical pipe is disposed in the vertical pipe connection portion. At this time, the vertical pipe is engaged with the protruding portion from above the protruding portion via a packing.

[0004] Wastewater (liquid) flowing out of the drainage system flows into the manifold through the vertical pipe. The wastewater hits the swirl vanes and flows downward inside the body of the manifold while rotating around the axis. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-112869 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the wastewater hits any of the swirl vanes, the vane support portion, and the protrusions, the swirl vanes, the vane support portion, and the protrusions vibrate, which may cause noise to be generated from the collective joint.

[0007] The present invention has been made in consideration of such problems, and has an object to provide a collective joint that suppresses noise generated by flowing liquid, and a piping structure equipped with this collective joint. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention proposes the following means. (1) A first aspect of the present invention is a collective joint comprising a joint body arranged with its axis along the vertical direction, and a connecting blade unit fitted to an upper end of the joint body, wherein the connecting blade unit has a vertical pipe connecting part whose lower end is fitted to an inner peripheral surface of the upper end of the joint body, a protrusion provided on the inner peripheral surface of the lower end of the vertical pipe connecting part so as to protrude radially inward, a blade support part extending downward from the lower end of the vertical pipe connecting part, swirl blades provided on the inner peripheral surface of the blade support part, and a protrusion provided on the blade support part, wherein the protrusion is located at the same position as the radially inner end of the protrusion or radially outward from the end when viewed in the vertical direction.

[0009] In the present invention, for example, the lower end portion of the vertical pipe is disposed in the vertical pipe connecting portion. At this time, the vertical pipe is engaged with the protruding portion from above the protruding portion. For example, liquid that flows into the joint body through the vertical pipe hits the swirl vane. The liquid can be caused to flow downward inside the joint body while being swirled around the axis by the swirl vane. The swirl vane is supported by the vane support portion, and the ridge portion reinforces the vane support portion, thereby suppressing vibration of the vane support portion. In addition, when viewed from the top to bottom, the ridges are located at the same position as the radially inner end of the protrusions or radially outward from this end. This makes it difficult for liquid that flows below the protrusions to hit the ridges. This makes it difficult for the ridges to vibrate, making it possible to suppress noise generated by liquid flowing into the collective joint.

[0010] (2) A second aspect of the present invention may be the collective joint described in (1), in which the protrusions include a first protrusion arranged at an end portion on a first circumferential side of the inner surface of the blade support part so as to extend in an up-down direction, and a second protrusion arranged at an end portion on a second circumferential side of the inner surface of the blade support part so as to extend in an up-down direction. In this aspect of the invention, the first protrusion and the second protrusion can reinforce the blade support portion at both circumferential ends of the inner circumferential surface of the blade support portion.

[0011] (3) A third aspect of the present invention may be the collective joint described in (2), wherein an upper surface of the swirl vane is gradually inclined downward as it approaches the first side in the circumferential direction, the first protrusion portion is spaced upward from the swirl vane, and the second protrusion portion is positioned above the swirl vane and is connected to the swirl vane. In this invention, the liquid that hits the upper surface of the swirl vane flows downward within the joint body while swirling around the axis toward the first side in the circumferential direction. Since the first ridge portion is spaced above the swirl vane, it is possible to prevent the first ridge portion from interfering with the liquid flowing on the upper surface of the swirl vane toward the first side in the circumferential direction. Also, since the second ridge portion is disposed above the swirl vane and is connected to the swirl vane, it is possible to prevent the second ridge portion from vibrating not only the blade support portion but also the swirl vane.

[0012] (4) A fourth aspect of the present invention may be the collective joint described in (2) or (3), in which a first side surface of the first ridge portion facing the second side in the circumferential direction, and a second side surface of the second ridge portion facing the first side in the circumferential direction, gradually become spaced apart from each other as they approach a predetermined direction intersecting the axis. In this invention, for example, the collective joint is manufactured by injection molding using a mold having a core that moves in a predetermined direction relative to the first and second ridges. During this process, friction between the first and second side faces and the core is reduced, making it easy to manufacture the collective joint.

[0013] (5) A fifth aspect of the present invention may be a collective joint as described in any one of (1) to (4), in which the vertical pipe connection portion, the protrusion portion, the blade support portion, the swirl blade, and the protrusion portion are integrally configured. In the present invention, for example, the vertical pipe connection portion, the protrusion, the blade support portion, the swirl blades, and the protrusion portion can be integrally formed by injection molding or the like.

[0014] (6) A sixth aspect of the present invention is a piping structure comprising a collecting joint according to any one of (1) to (5) and a vertical pipe having a lower end disposed within the vertical pipe connection portion, wherein, when viewed in the vertical direction, the inner circumferential surface of the vertical pipe is positioned at the same position as the end of the protrusion or radially outward from the end. In this invention, a piping structure can be constructed using a collective joint that suppresses noise generated by liquid flowing into the joint body through a vertical pipe. Effect of the Invention

[0015] The collective joint and piping structure of the present invention can suppress noise generated by flowing liquid. [Brief description of the drawings]

[0016] [Figure 1] 1 is a cross-sectional front view of a piping structure according to an embodiment of the present invention; [Diagram 2] FIG. 4 is a plan view of a unit main body of the piping structure. [Diagram 3] FIG. [Figure 4] FIG. 2 is a front view of a collective joint in a first modified example of an embodiment of the present invention. [Diagram 5] FIG. 11 is a front view of a collective joint in a second modified example of an embodiment of the present invention. [Figure 6] FIG. 11 is a cross-sectional plan view of a collective joint in a third modified example of one embodiment of the present invention. [Figure 7] FIG. 11 is a cross-sectional plan view of a group joint in a fourth modified example of one embodiment of the present invention. [Figure 8] FIG. 13 is a front view of a collective joint in a fifth modified example of an embodiment of the present invention. [Figure 9] 9 is a cross-sectional view taken along line A1-A1 in FIG. 8. [Figure 10] FIG. 13 is a front view of a collective joint in a sixth modified example of an embodiment of the present invention. [Figure 11] FIG. 13 is a front view of a collective joint in a seventh modified example of an embodiment of the present invention. [Figure 12] FIG. 13 is a cross-sectional plan view of a collective joint in an eighth modified example of an embodiment of the present invention. [Figure 13] FIG. 13 is a front view of a collective joint in a ninth modified example of one embodiment of the present invention. [Figure 14] FIG. 23 is a front view of a collective joint in a tenth modified example of one embodiment of the present invention. [Figure 15] FIG. 23 is a cross-sectional plan view of a collective joint in an eleventh modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, one embodiment of a collective joint and a piping structure according to the present invention will be described with reference to Figs. As shown in Fig. 1, the piping structure 1 of this embodiment includes a first vertical pipe (vertical pipe) 10, a second vertical pipe 15, a horizontal pipe 20, and a joint assembly 25 of this embodiment. In Fig. 1, the vertical pipes 10, 15 and the horizontal pipe 20 are indicated by two-dot chain lines.

[0018] The vertical pipes 10, 15 and the horizontal pipe 20 are formed into a tubular shape from polyvinyl chloride resin or the like. The first vertical pipe 10 and the second vertical pipe 15 extend in the up-down direction. Here, "A extends along B" means that the angle between A and B is 30 degrees or less. It is more preferable that this angle is 15 degrees or less. The first vertical pipe 10 is disposed above the second vertical pipe 15. The lower end of the collective joint 25 on the upper floor is connected to the upper end of the first vertical pipe 10. The lower end of the second vertical pipe 15 is connected to the upper end of the collective joint 25 on the lower floor and a leg joint (not shown). The horizontal pipe 20 is disposed along a horizontal plane with a water gradient. A drainage facility is connected to a first end of the horizontal pipe 20.

[0019] The collective joint 25 has a joint body 26 , a horizontal pipe connection portion 47 , and a connection blade unit 51 . Here, the joint body 26 and the connecting blade unit 51 are formed in a cylindrical shape. The central axes of the joint body 26 and the connecting blade unit 51 are arranged coaxially with a common axis. Hereinafter, the common axis is referred to as the axis O1. The direction along the axis O1 is referred to as the axis O1 direction. The direction perpendicular to the axis O1 is referred to as the radial direction, and the direction going around the axis O1 is referred to as the circumferential direction.

[0020] The joint body 26 has an upper joint body 27, a connecting pipe 37, and a lower joint body 42. The upper joint body 27 has an upper body 28, a locking portion 29, a vertical rib 30, and a horizontal rib 31. The upper body 28 is formed in a cylindrical shape and is disposed on the axis O1. An opening 28a penetrating the peripheral wall of the upper body 28 is formed in the middle part in the vertical direction of the upper body 28. The number of openings 28a formed in the upper body 28 is not limited. The locking portion 29 is provided at the upper end of a portion of the inner circumferential surface of the upper main body 28 that is below the opening 28a. The locking portion 29 is formed in an annular shape and protrudes radially inward from the upper main body 28. A surface 29a of the locking portion 29 facing radially inward is inclined so as to gradually approach the axis O1 as it extends downward.

[0021] The vertical rib 30 is provided on the inner peripheral surface of the upper body 28 and extends in the up-down direction. The vertical rib 30 is formed in a range corresponding to the opening 28a and the locking portion 29 in the up-down direction. The lateral rib 31 is provided on the outer circumferential surface of the upper body 28, in a portion above the opening 28a. The lateral rib 31 extends in the circumferential direction. For example, the lateral rib 31 is provided to hold the upper body 28. An annular sealing member 32 is disposed in a portion of the upper body 28 below the locking portion 29. The sealing member 32 is locked to the locking portion 29 from below the locking portion 29.

[0022] The connecting pipe 37 is formed in a cylindrical shape and is disposed on the axis O1. The upper end of the connecting pipe 37 is disposed within the lower end of the upper body 28 of the upper joint body 27. The connecting pipe 37 is engaged with the engaging portion 29 of the upper body 28 from below the engaging portion 29 via the sealing member 32. The connecting pipe 37 protrudes downward from the upper body 28 . The connecting pipe 37 is fixed to the upper body 28 by adhesive or the like.

[0023] The lower joint body 42 has a lower body 43, a connection portion 44, and a lower vertical pipe connection portion 45. The lower body 43, the connection portion 44, and the lower vertical pipe connection portion 45 are each formed in a cylindrical shape and disposed on the axis O1. The inner and outer diameters of the lower body 43 gradually decrease from top to bottom. The connection part 44 is fixed to the outer circumferential surface of the upper end part of the lower main body 43. The connection part 44 protrudes upward from the lower main body 43. The lower vertical pipe connecting portion 45 is fixed to the outer circumferential surface of the lower end portion of the lower main body 43. The lower vertical pipe connecting portion 45 protrudes downward from the lower main body 43.

[0024] The lower body 43, the connection portion 44, and the lower vertical pipe connection portion 45 of the lower joint body 42 are integrally formed from polyvinyl chloride resin or the like. The lower end of the connection pipe 37 is disposed within the connection portion 44 of the lower joint body 42. The connection pipe 37 is fixed to the connection portion 44 by adhesive or the like. The joint body 26 configured as above is disposed so that its own axis O1 extends along the vertical direction.

[0025] The horizontal pipe connecting part 47 is formed in a cylindrical shape. The horizontal pipe connecting part 47 is disposed so that the axis O2 of the horizontal pipe connecting part 47 is along a horizontal plane. The horizontal pipe connecting part 47 is connected to the peripheral part of the opening 28a in the upper main body 28. The upper body 28, the locking portion 29, the vertical ribs 30, the horizontal ribs 31, and the horizontal pipe connecting portion 47 of the upper joint body 27 are integrally formed from polyvinyl chloride resin or the like.

[0026] The connecting blade unit 51 is fitted to the upper end of the joint body 26. As shown in FIGS. The unit body 52 has an upper vertical pipe connecting portion (vertical pipe connecting portion) 53, a protrusion 54, a blade support portion 55, a swirl blade 56, a first protrusion portion (protrusion portion) 57, and a second protrusion portion (protrusion portion) 58.

[0027] The upper vertical pipe connecting portion 53 has a large diameter portion 53a and a small diameter portion (a lower end portion of the vertical pipe connecting portion) 53b. The large diameter portion 53a and the small diameter portion 53b are each formed in a cylindrical shape and are disposed on the axis O1. As shown in Fig. 1, the inner diameter and outer diameter of the large diameter portion 53a are approximately the same as the inner diameter and outer diameter of the upper body 28 of the upper joint body 27. The outer diameter of the small diameter portion 53b is approximately the same as the inner diameter of the upper body 28 of the upper joint body 27. The small diameter portion 53b is fixed to the inner circumferential surface of the lower end portion of the large diameter portion 53a. The small diameter portion 53b protrudes downward from the large diameter portion 53a. The small diameter portion 53b is fitted into the inner circumferential surface of the upper end portion of the upper joint body 27 of the joint body .

[0028] 1 to 3, the protrusion 54 is provided so as to protrude radially inward on the inner circumferential surface of the lower end portion of the small diameter portion 53b of the upper vertical pipe connecting portion 53. The protrusion 54 is formed in an annular shape and is formed around the entire circumference of the small diameter portion 53b. The protrusion 54 may be formed only partially in the circumferential direction. The blade support portion 55 extends downward from a part of the circumferential direction at the lower end of the small diameter portion 53b of the upper vertical pipe connection portion 53. That is, the blade support portion 55 is formed in a curved flat plate shape, and is formed in an arc shape when viewed in the up-down direction. The lower end of the blade support portion 55 extends gradually further downward toward a first side (hereinafter simply referred to as the first side) D1 in the circumferential direction. Hereinafter, the side opposite to the first side D1 in the circumferential direction will be referred to as a second side (hereinafter simply referred to as the second side) D2 in the circumferential direction. The blade support portion 55 is disposed radially inside the upper body 28, with almost no gap being formed between the blade support portion 55 and the upper body 28.

[0029] The swirl vane 56 is formed, for example, in the shape of a curved plate, and is provided on an inner peripheral surface (surface facing radially inward) 55a of the lower end of the blade support part 55. The swirl vane 56 protrudes radially inward from the blade support part 55. The upper surface 56a of the swirl vane 56 is gradually inclined downward as it approaches the first side D1.

[0030] The first protrusion 57 and the second protrusion 58 are respectively provided on the inner circumferential surface 55a of the blade support portion 55, and protrude radially inward. The protrusions 57, 58 extend downward from the protruding portion . The first protrusion 57 is disposed at the end of the first side D1 of the blade support part 55 so as to extend in the up-down direction. The first protrusion 57 has a rectangular shape when viewed from the front in the radial direction. A surface 57a facing the inside in the radial direction at the lower end of the first protrusion 57 is gradually inclined so as to move away from the axis O1 as it extends downward. The first protrusion 57 has a trapezoidal shape when viewed from the side in the circumferential direction. The first protrusion 57 is disposed above the swirl vane 56. The first protrusion 57 is spaced upward from the swirl vane 56. Here, the first protrusion 57 being spaced upward from the swirl vane 56 means that not only the upper end of the inclined surface 57a but also the lower end of the surface 57a is spaced upward from the swirl vane 56, i.e., the entire first protrusion 57 is spaced upward from the swirl vane 56.

[0031] The second protrusion 58 is disposed to extend in the up-down direction at the end of the second side D2 on the inner circumferential surface 55a of the blade support part 55. The second protrusion 58 has a trapezoidal shape when viewed from the front in the radial direction, and a rectangular shape when viewed from the side in the circumferential direction. The second protrusion 58 is disposed above the swirl vane 56 and is connected to the swirl vane 56 . The first protrusion 57 and the second protrusion 58 are spaced apart from each other in the circumferential direction. As shown in FIG. 1, the lower end of the first protrusion 57 (the lower end of the surface 57a) is disposed below the upper end of the opening a of the upper body .

[0032] 2, when viewed in the vertical direction, the protrusions 57, 58 are disposed at the same position as the radially inner end 54a of the protrusion 54 or radially outward of this end 54a. In other words, when viewed from above, the protrusions 57, 58 are disposed within the projected area of ​​the protrusion 54 (so as to be hidden by the protrusion 54). The upper vertical pipe connection portion 53, protrusion portion 54, blade support portion 55, swirl blade 56, first protrusion portion 57, and second protrusion portion 58 of the unit body 52 are integrally constructed from the same material as the upper joint body 27.

[0033] There is no limitation on the configuration of the seal member 62. For example, the seal member 62 has a seal body 63, a thick portion 64, and a fin portion 65, as shown in FIG. The seal body 63 is formed in a cylindrical shape. The thickness of the peripheral wall of the seal body 63 is shorter than the length by which the protrusion 54 protrudes radially inward. The seal body 63 is disposed radially inward of the large diameter portion 53a and the small diameter portion 53b of the upper vertical pipe connection portion 53 and coaxially with the axis O1.

[0034] The thick-walled portion 64 is formed in an annular shape and is disposed on the inner circumferential surface of the lower end of the seal body 63. When viewed in the vertical direction, a radially inner end 64a of the thick-walled portion 64 overlaps with the end 54a of the protruding portion 54. A recess 64b recessed upward is formed on the lower surface of the thick-walled portion 64. The recess 64b is formed around the entire circumference of the thick-walled portion 64. The fin portion 65 is fixed to the inner circumferential surface of the upper end portion of the seal body 63. In a natural state in which no external force is acting on the fin portion 65, the fin portion 65 gradually inclines downward as it moves radially inward.

[0035] The seal body 63, thick portion 64, and fin portion 65 of the seal member 62 are integrally formed from synthetic rubber or the like.

[0036] The pressing member 72 has a main body 73 and a cylindrical portion 74 . The main body 73 is formed in an annular shape and is disposed coaxially with the axis O1. The main body 73 is engaged with the large diameter portion 53a of the upper vertical pipe connecting portion 53 and the seal main body 63 of the seal member 62 from above the large diameter portion 53a and the seal main body 63. The cylindrical portion 74 is formed in a cylindrical shape and is fixed to the outer circumferential surface of the main body 73. The cylindrical portion 74 protrudes downward from the main body 73. The cylindrical portion 74 is fitted into the large diameter portion 53a of the upper vertical pipe connecting portion 53 from the radial outside of the large diameter portion 53a.

[0037] The body 73 and the cylindrical portion 74 of the pressing member 72 are integrally formed from the same material as the upper joint body 27 . The connecting blade unit 51 does not necessarily have to include the sealing member 62 and the pressing member 72.

[0038] The lower end of the first vertical pipe 10 is disposed within the seal member 62, the press member 72, and the upper vertical pipe connection portion 53 of the connecting blade unit 51. The lower end of the first vertical pipe 10 is engaged with the protruding portion 54 of the unit body 52 from above the protruding portion 54 via the thick portion 64 of the seal member 62. When viewed in the up-down direction, the inner circumferential surface of the first vertical pipe 10 is disposed at the same position as the end 54a of the protruding portion 54 or radially outward of the end 54a. At this time, the first vertical pipe 10 elastically deforms the radially inner end of the fin portion 65 of the seal body 63 downward and radially outward. The upper end of the second vertical pipe 15 is disposed within the lower vertical pipe connection portion 45 of the joint body 26 . A second end portion of the horizontal pipe 20 opposite to the first end portion is disposed within a horizontal pipe connecting portion 47 of the collective joint 25 .

[0039] As described above, in the collective joint 25 of this embodiment, the lower end of the first vertical pipe 10 is disposed in the upper vertical pipe connection portion 53. At this time, the first vertical pipe 10 engages with the protruding portion 54 from above the protruding portion 54. For example, wastewater (liquid) that flows into the joint body 26 through the first vertical pipe 10 hits the swirl vane 56. This wastewater can be caused to flow downward within the joint body 26 while being swirled around the axis O1 by the swirl vane 56. This wastewater flows through the second vertical pipe 15 and is treated in the wastewater treatment facility. The blade support portion 55 supports the swirl blades 56, and the protrusions 57, 58 reinforce the blade support portion 55, thereby making it possible to suppress vibration of the blade support portion 55. Furthermore, when viewed in the up-down direction, the protrusions 57, 58 are disposed at the same position as the end 54a of the protrusion 54 or radially outward of this end 54a. Therefore, wastewater that flows below the protrusion 54 is less likely to hit the protrusions 57, 58. Therefore, the protrusions 57, 58 are less likely to vibrate, and the noise generated by the wastewater flowing into the collective joint 25 can be suppressed.

[0040] The lower end of the first protrusion 57 is disposed below the upper end of the opening 28a of the upper body 28. This makes it possible to prevent, for example, wastewater that has flowed from the first vertical pipe 10 into the collecting joint 25 from flowing back into the horizontal pipe 20 through the opening 28a. The lower end of the first protrusion 57 is preferably located below the axis O2. The lower end of the first protrusion 57 is preferably located above the lower end of the opening a of the upper body .

[0041] The protrusions include first protrusions 57 and second protrusions 58. Therefore, first protrusions 57 and second protrusions 58 can reinforce blade support portion 55 at both circumferential ends of inner peripheral surface 55a of blade support portion 55. The upper surface 56a of the swirl vane 56 is gradually inclined downward toward the first side D1, the first protrusion 57 is spaced upward from the swirl vane 56, and the second protrusion 58 is connected to the swirl vane 56. As a result, the wastewater that hits the upper surface 56a of the swirl vane 56 flows downward within the joint body 26 while swirling around the axis O1 toward the first side D1. Since the first protrusion 57 is spaced upward from the swirl vane 56, it is possible to prevent the first protrusion 57 from interfering with the wastewater flowing toward the first side D1 on the upper surface 56a of the swirl vane 56. In addition, the second protrusion 58 can prevent not only the blade support part 55 but also the swirl vane 56 from vibrating.

[0042] The upper vertical pipe connecting portion 53, the protruding portion 54, the blade support portion 55, the swirl blade 56, the first protruding portion 57, and the second protruding portion 58 are integrally configured. Therefore, the upper vertical pipe connecting portion 53, the protruding portion 54, the blade support portion 55, the swirl blade 56, the first protruding portion 57, and the second protruding portion 58 can be integrally formed by injection molding or the like. Moreover, in the piping structure 1 of the present embodiment, the piping structure 1 can be configured using the collective joint 25 that suppresses the sound generated by wastewater flowing into the joint body 26 through the first vertical pipe 10.

[0043] The configuration of the collective joint 25 of this embodiment can be modified in various ways, as described below. Like the connecting blade unit 51A of the first modified collective joint 25A shown in FIG. 4, each component of the connecting blade unit 51 may have a first protrusion portion 57A and a second protrusion portion 58A instead of the first protrusion portion 57 and the second protrusion portion 58. The radially inner outer edge of the first protrusion 57A is formed in a curved shape (arcuate shape) that is convex in a direction between the radially inner side and the downward direction when viewed in the circumferential direction. The second protrusion 58A has a rectangular shape when viewed from the side in the circumferential direction. When viewed from the front in the radial direction, the outer edge of the first side D1 of the second protrusion 58A is formed in a curved shape that protrudes in a direction between the first side D1 and the downward direction.

[0044] Like the connecting blade unit 51B of the second modified collective joint 25B shown in Figure 5, each component of the connecting blade unit 51 may have a first protrusion portion 57B and a second protrusion portion 58B instead of the first protrusion portion 57 and the second protrusion portion 58. The first protrusion 57B has a rectangular shape when viewed from the front in the radial direction. When viewed from the side in the circumferential direction, the radially inner outer edge of the first protrusion 57B is formed into a curved shape that is convex toward the radially outer side and upward. The second protrusion 58B has a rectangular shape when viewed from the side in the circumferential direction. The outer edge of the first side D1 of the second protrusion 58B is formed in a curved shape that protrudes toward the second side D2 when viewed from the front in the radial direction.

[0045] The collective joints 25A and 25B of the first and second modified examples can achieve the same effects as the collective joint 25 of the present embodiment. Furthermore, the wall thickness (circumferential length) of the second protruding stripe portion 58B of the collective joint 25B can be reduced, making it possible to suppress molding defects when manufacturing the collective joint 25B by injection molding.

[0046] As in the case of a connecting blade unit 51C of a collective joint 25C of a third modified example shown in Fig. 6, in addition to each component of the connecting blade unit 51, a third protrusion portion (protrusion portion) 80 may be provided. In Fig. 6, the upper body 28 is indicated by a two-dot chain line. In the collective joint 25C, a certain gap is formed between the upper body 28 and the blade support portion 55. The third protrusion 80 is provided at the end of the first side D1 on the outer circumferential surface of the blade support portion 55, and is disposed in the gap. In the collective joint 25C of the third modified example, the blade support portion 55 is reinforced by the third protrusion portion 80, and vibration of the blade support portion 55 can be further suppressed.

[0047] Like the connecting blade unit 51D of the fourth modified collective joint 25D shown in Figure 7, each component of the connecting blade unit 51 may have a first protrusion portion 57D and a second protrusion portion 58D instead of the first protrusion portion 57 and the second protrusion portion 58. Here, the surface of the first protrusion 57D facing the second side D2 is defined as a first side surface 57Da, and the surface of the second protrusion 58D facing the first side D1 is defined as a second side surface 58Da. The first side surface 57Da and the second side surface 58Da are gradually spaced apart from each other in a predetermined direction D4 that intersects with the axis O1. That is, a draft is formed in the side surfaces 57Da and 58Da. In the collective joint 25D of the fourth modified example configured as described above, for example, collective joint 25D is manufactured by injection molding using a mold having a core that moves in a predetermined direction D4 relative to the first ridge portions 57D and the second ridge portions 58D. During this process, friction between the first side surface 57Da, the second side surface 58Da, and the core is reduced, making it easy to manufacture collective joint 25D.

[0048] As in the connection blade unit 51E of the collective joint 25E of the fifth modified example shown in Figures 8 and 9, in each configuration of the connection blade unit 51, a recess 58a may be formed in the portion of the second side D2 of the second protrusion portion 58. Note that in Figures 8 and 9, the shape of the second protrusion portion 58 in the collective joint 25 of this embodiment is shown by a two-dot chain line L1. In this example, the bottom surface of the recess 58a is perpendicular to the radial direction (see FIG. 9). In the collective joint 25E of the fifth modified example, the wall thickness (radial length) of the second protrusions 58 can be reduced, making it possible to suppress molding defects when manufacturing the collective joint 25E by injection molding.

[0049] As indicated by a two-dot chain line L2 in FIG. 9, the bottom surface of the recess 58a may be inclined so as to gradually approach the axis O1 as it approaches a predetermined direction D6 intersecting the axis O1. With this configuration, for example, collective joint 25E is manufactured by injection molding using a mold having a core that moves in predetermined direction D6 relative to first ridge portion 57 and second ridge portion 58. At that time, friction between the bottom surface of recess 58a and the core is reduced, making it possible to easily manufacture collective joint 25E.

[0050] Like a connecting blade unit 51F of a collective joint 25F of a sixth modified example shown in FIG. 10, each component of the connecting blade unit 51 may have a first protrusion portion 57F instead of the first protrusion portion 57. The first protrusion 57F protrudes from the blade support portion 55 toward the first side D1. The protruding length of the first protrusion 57F gradually increases toward the top. Like the connecting blade unit 51G of the seventh modified collective joint 25G shown in Figure 11, each component of the connecting blade unit 51 may have a first protrusion portion 57F and a second protrusion portion 58G instead of the first protrusion portion 57 and the second protrusion portion 58. The second protrusion 58G protrudes from the blade support portion 55 toward the second side D2. The protruding length of the second protrusion 58G gradually increases toward the top.

[0051] Like the connecting blade unit 51H of the eighth modified collective joint 25H shown in Figure 12, each component of the connecting blade unit 51 may have a first protrusion portion 57F and a second protrusion portion 58G instead of the first protrusion portion 57 and the second protrusion portion 58. With this configuration, the thickness (radial length) of the blade support portion 55 and the protrusions 57F, 58G can be made uniform.

[0052] Like a connecting blade unit 51I of a collective joint 25I of a ninth modified example shown in FIG. 13, in addition to each component of the connecting blade unit 51, a first protrusion portion 57F may be provided. Like a connection blade unit 51J of a collective joint 25J of a tenth modified example shown in FIG. 14, in addition to each component of the collective joint 25G of the seventh modified example, a first protrusion portion 57F and a second protrusion portion 58G may be provided. Like a connection blade unit 51K of a collective joint 25K of an eleventh modified example shown in FIG. 15, in addition to each component of the connection blade unit 51, a first protrusion portion 57F and a second protrusion portion 58G may be provided. In the collective joints 25I, 25J, and 25K of the ninth to eleventh modified examples, the blade support portion 55 is reinforced, and vibration of the blade support portion 55 can be further suppressed.

[0053] Although one embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and changes, combinations, deletions, etc. of the configuration are also included within the scope that does not deviate from the gist of the present invention. For example, in the above embodiment, the second ridge portion 58 may be spaced apart from the swirl vane 56 . The collective joint 25 may not have one of the first protrusion portion 57 and the second protrusion portion 58. In this case, the remaining protrusion portion may be disposed in the middle portion of the blade support portion 55 in the circumferential direction.

[0054] The upper vertical pipe connection portion 53, the protrusion portion 54, the blade support portion 55, the swirl blade 56, the first protrusion portion 57, and the second protrusion portion 58 of the unit body 52 may be constructed individually and then fitted together, etc. The collective joint 25 may not have the locking portion 29, the vertical rib 30, the horizontal rib 31, the seal member 62, and the pressing member 72. The liquid may be water or the like. [Explanation of symbols]

[0055] 1 Piping structure 10 First vertical pipe (vertical pipe) 25, 25A, 25B, 25C, 25D, 25E, 25F, 25G, 25H, 25I, 25J, 25K joints 26 Fitting body 51, 51A, 51B, 51C, 51D, 51E, 51F, 51G, 51H, 51I, 51J, 51K Connecting blade unit 53 Upper vertical pipe connection (vertical pipe connection) 53b Small diameter section (lower end of vertical pipe connection section) 54 Protrusion 54a end 55 Blade support part 55a Inner surface 56 Swirling blades 56a Top side 57,57A,57D,57F 1st protrusion (protrusion) 57Da 1st side 58,58A,58D,58G 2nd protrusion part (protrusion part) 58Da 2nd side 80 Third protrusion part (protrusion part) D1 First side D2 2nd side D4 orientation O1 axis

Claims

1. A joint body arranged so that its axis is along the vertical direction; a connecting blade unit fitted to an upper end of the joint body; Equipped with The connecting blade unit includes: a vertical pipe connection portion having a lower end portion fitted to an inner peripheral surface of the upper end portion of the joint body; a protrusion provided on an inner circumferential surface of the lower end portion of the vertical pipe connection portion so as to protrude radially inward; a blade support portion extending downward from the lower end portion of the vertical pipe connection portion; A swirl vane provided on an inner circumferential surface of the vane support portion; A protrusion portion provided on the blade support portion; having a collective joint, wherein, when viewed in the up-down direction, the protrusion portion is located at the same position as an end of the protrusion portion in the radial direction or further outward in the radial direction than the end.

2. As the protrusion portion, a first protrusion portion disposed at an end portion of an inner peripheral surface of the blade support portion on a first side in a circumferential direction so as to extend along a vertical direction; a second protrusion portion disposed at an end portion of an inner peripheral surface of the blade support portion on a second side in the circumferential direction so as to extend along a vertical direction; The assembly joint of claim 1 , having

3. The upper surface of the swirl vane is gradually inclined downward toward the first side in the circumferential direction, The first protrusion is spaced upward from the swirl vane, The collective joint according to claim 2 , wherein the second protrusion portion is disposed above the swirl vane and is connected to the swirl vane.

4. 4. The assembly joint according to claim 2 or 3, wherein a first side surface of the first ridge portion facing the second side in the circumferential direction and a second side surface of the second ridge portion facing the first side in the circumferential direction gradually become spaced apart from each other as they move toward a predetermined direction intersecting the axis.

5. The collective joint according to claim 1 or 2, wherein the vertical pipe connection portion, the protrusion portion, the blade support portion, the swirl blade, and the protrusion portion are integrally formed.

6. The collective joint according to claim 1 or 2; A vertical pipe having a lower end disposed within the vertical pipe connection portion; Equipped with A piping structure, wherein, when viewed in the up-down direction, an inner circumferential surface of the vertical pipe is positioned at the same position as the end of the protrusion or radially outward from the end.

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