JP2023116634A - Collective joint, lower collective pipe manufacturing method, collective joint manufacturing method - Google Patents

Abstract

To provide a collective joint which improves drainage performance by ensuring a wide space below swirl vanes in an inclined pipe part when the collective joint is formed by injection molding.SOLUTION: A collective joint 11 comprises a joint body 16 formed in a tubular shape and arranged so that an axis O extends in the vertical direction, and swirl vanes 34 provided on the inner peripheral surface of the joint body. The swirl vanes gradually extend toward a first side in the circumferential direction from the top to the bottom. The joint body has an inclined pipe portion 32 whose diameter gradually decreases from the top to the bottom. At least a portion of the swirl vanes is provided on the inner peripheral surface of the inclined pipe portion. The inner peripheral surface of the inclined pipe portion has a first inner surface 32a inclined so as to gradually approach the axis from the top to the bottom, and a second inner surface 32b provided on the lower part of the swirl vanes and inclined so as to gradually move away from the axis from the top to the bottom.SELECTED DRAWING: Figure 4

Description

The present invention relates to assembly joints.

Conventionally, buildings such as collective housing and office buildings are provided with collective joint systems such as drainage channels (see, for example, Patent Documents 1 and 2). For example, the collective joint system consists of horizontal pipes that collect wastewater on each floor of a building, vertical pipes that allow the collected wastewater to flow downward, and collective joints that connect the horizontal pipes and the vertical pipes. I have.

The collective joint includes a tubular joint body, a horizontal pipe connecting portion provided on the outer peripheral surface of the joint main body, and swirl vanes provided on the inner peripheral surface of the joint main body.
The joint main body is arranged such that the axis extends in the vertical direction. The joint body has an inclined pipe portion formed below the horizontal pipe connecting portion so that the outer diameter and the inner diameter gradually decrease from the top to the bottom.
At least part of the swirl vane is arranged on the inner peripheral surface of the inclined tube portion. Vertical pipes are connected to the upper end and the lower end of the joint body, respectively. A horizontal pipe is connected to the horizontal pipe connecting portion.

Drainage that has flowed into the joint body from the vertical pipe and the horizontal pipe connected to the upper end of the joint body hits the upper surface of the swirl vane and flows spirally along the upper surface of the swirl vane. While the waste water spirals down the joint body of the collection joint, the air inside the joint body flows upward through the space where the waste water does not flow.
In this way, the collecting joint system can improve the drainage performance, which is the flow rate of the drainage flowing inside while suppressing the pressure difference generated inside.

JP-A-2000-096646 JP-A-2001-173866

The assembly joints disclosed in Patent Documents 1 and 2 were formed of cast iron or the like by casting, but recently, instead of casting, assembly joints are formed of resin or the like by injection molding. At this time, since the inclined tube portion is formed as described above, the space above the swirl vane in the inclined tube portion is formed using the core of the mold, and the assembly joint is formed by injection molding and then assembled. It is easy to remove the core from the assembly joint by moving the core up relative to the joint.
However, even if a core is used to form the space below the swirl vane in the inclined tube portion, the core cannot be moved upward because the core engages with the swirl vane. Since the diameter decreases toward the bottom, the core cannot be moved downward, and it is difficult to remove the core from the assembly joint after the assembly joint is formed by injection molding.

The present invention has been made in view of such problems, and when a collective joint is formed by injection molding, a wide space is secured below the swirl vane in the inclined pipe portion to improve the drainage performance. The object is to provide an assembly joint.

In order to solve the above problems, the present invention proposes the following means.
A collective joint of the present invention comprises a joint body formed in a tubular shape and having an axis arranged in a vertical direction, and swirl vanes provided on an inner peripheral surface of the joint body, wherein the swirl vanes are The joint body has an inclined pipe portion that gradually decreases in diameter from the top to the bottom, and at least a part of the swirl vanes: The inner peripheral surface of the inclined tube portion is provided on the inner peripheral surface of the inclined tube portion, and the inner peripheral surface of the inclined tube portion includes a first inner surface that is gradually inclined so as to approach the axis as it goes downward from above, and a first inner surface that is below the swirl vane. and a second inner surface that is arranged in the portion and gradually slopes away from the axis line from the top to the bottom.
The lower portion of the swirl vane referred to herein includes not only the portion located below any portion of the swirl vane, but also the portion located below a portion of the swirl vane, but also other portions of the swirl vane. It is meant to include the portion that is not arranged below the part.

According to this invention, the first inner surface of the slanted tube portion is slanted so as to gradually separate from the axis as it goes upward from below. For this reason, the first inner surface is formed using, for example, a first core of a mold, and after the assembly joint is formed by injection molding, the first core is moved upward with respect to the assembly joint to move the first core from the assembly joint. Core can be removed. Also, the second inner surface of the inclined tube portion is arranged below the swirl vane and is inclined so as to gradually separate from the axis as it goes downward. For this reason, the second inner surface is formed, for example, by using a second core of a mold, and after the assembly joint is formed by injection molding, the second core is moved downward with respect to the assembly joint to remove the second core from the assembly joint. Core can be removed.

In this manner, the second inner surface, which is a part of the inner peripheral surface of the inclined tube portion and is arranged below the swirl vane, can be formed using the second core. A large space can be secured below.
For example, when waste water flows into the collecting joint, this waste water flows spirally so as to swirl against the surface of the swirl vane facing the first side in the circumferential direction. Since the space arranged below the swirl vane makes it difficult for the flow of the waste water to be obstructed, the drainage performance of the collection joint can be enhanced.

Further, in the assembly joint described above, at least a part of the outer peripheral surface of the inclined tube portion disposed radially outward of the second inner surface is gradually inclined away from the axis line from above to below. may be
According to this invention, the radial thickness of the inclined tube portion disposed between the second inner surface and at least a portion of the outer peripheral surface of the inclined tube portion disposed radially outside the second inner surface is By making it thin, it is possible to suppress the occurrence of sink marks and the like in this portion formed by injection molding, thereby preventing molding defects.

Further, in the assembly joint described above, the inner peripheral surface of the inclined pipe portion has a third inner surface extending radially outward from the end of the second inner surface on the second side in the circumferential direction and facing the second side. may
According to this invention, the first inner surface and the second inner surface of the inclined tube portion can be connected by the third inner surface.

According to the collecting joint of the present invention, when the collecting joint is formed by injection molding, it is possible to secure a wide space below the swirl vane in the inclined tube portion and improve the drainage performance.

1 is a partially cutaway side view of a collection joint system in which the collection joint of one embodiment of the present invention is used; FIG. It is the perspective view which fracture|ruptured a part of lower connection pipe of the assembly joint. It is a top view of the same lower connecting pipe. 4 is a cross-sectional view taken along a section line IV-IV in FIG. 3; FIG. 4 is a cross-sectional view taken along a cutting line VV in FIG. 3; FIG. 4 is a cross-sectional view taken along a section line VI-VI in FIG. 3; FIG. It is a side view of the same lower connecting pipe. It is sectional drawing of the metal mold|die for forming the same lower connection pipe by injection molding. FIG. 7 is a cross-sectional view of a lower connection pipe of a collective joint according to another embodiment of the present invention, corresponding to the cross-sectional view shown in FIG. 6; FIG. 10 is a cross-sectional view showing a state in which the lower connecting pipe shown in FIG. 9 is connected to a vertical pipe; FIG. 4 is a cross-sectional view showing a lower connecting pipe and a vertical pipe that constitute a collective joint system of a first modified example of the present invention; FIG. 11 is a cross-sectional view showing a lower connecting pipe and vertical pipes that constitute a collective joint system of a second modified example of the present invention; FIG. 11 is a cross-sectional view showing a lower connecting pipe and vertical pipes that constitute a collective joint system of a third modified example of the present invention; FIG. 11 is a cross-sectional view showing a lower connecting pipe and vertical pipes that constitute a collective joint system of a fourth modified example of the present invention;

Hereinafter, a collection joint system using one embodiment of the collection joint according to the present invention will be described with reference to FIGS. 1 to 8. FIG.
As shown in FIG. 1 , this assembly joint system 1 is used for drainage of a building 101 . The assembly joint system 1 is arranged on each floor through a slab through-hole 102a formed in a floor slab 102 of a building 101. As shown in FIG. Note that FIG. 1 shows a simplified configuration of a lower connection pipe 19, which will be described later.

The collection joint system 1 comprises a collection joint 11 , a vertical pipe 46 and a horizontal pipe 48 .
The collective joint 11 includes a joint body 16 and a horizontal pipe connection portion 41 . The joint main body 16 is formed in a circular tubular shape, and arranged so that the axis O extends along the vertical direction. Hereinafter, the circumferential direction X (see FIG. 3) of the joint body 16 is simply referred to as the circumferential direction X. As shown in FIG.
The joint body 16 includes an upper connection pipe 17 and a lower connection pipe 19 connected to the upper connection pipe 17 via an intermediate pipe 18 .
A lateral pipe connection portion 41 is fixed to the outer peripheral surface of the upper connection pipe 17 . In this embodiment, a plurality of lateral pipe connecting portions 41 are provided on the outer peripheral surface of the upper connecting pipe 17 . A horizontal pipe 48 is connected to the horizontal pipe connecting portion 41 .
A blocking plate 22 is fixed to the inner peripheral surface of the upper connection pipe 17 . The dam plate 22 prevents the waste water from flowing back into the horizontal pipe 48 .
The upper connection pipe 17 is made of vinyl chloride resin or the like.

A vertical pipe connection portion 23 is attached to the upper end portion of the upper connection pipe 17 . The vertical pipe connection portion 23 has a first swirl vane 24 . The first swirl vane 24 is arranged at a position corresponding to the horizontal pipe 48 in the vertical direction.
A vertical pipe 46 is connected to the vertical pipe connection portion 23 . The outer diameter of the vertical pipe 46 is smaller than the inner diameter of the upper connecting pipe 17 .

The intermediate pipe 18 and the lower connection pipe 19 are arranged below the horizontal pipe connection portion 41 .
The intermediate pipe 18 is made of polyvinyl chloride resin, and preferably contains a resin composition containing polyvinyl chloride resin and thermally expandable graphite. That is, the intermediate pipe 18 is produced by molding a resin composition. The intermediate tube 18 is typically made by extruding a resin composition.
Further, the intermediate pipe 18 may have a single-layer structure in which the entire intermediate pipe 18 is made of a resin composition, or may have a multi-layer structure in which a plurality of layers are formed. In the case of a multilayer structure, any layer should just be formed from the resin composition. For example, when the intermediate pipe 18 has a three-layer structure consisting of a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition, and the surface layer, intermediate layer, and inner layer may contain an endothermic agent. may contain.
When the intermediate pipe 18 does not contain thermally expandable graphite, a sheet-like refractory material containing thermally expandable graphite is wrapped around the outer surface of the intermediate pipe 18 or the outer surface of the sound insulating material covering the intermediate pipe 18 to provide a refractory material. A material may be embedded in the slab through hole 102a.

As an example, a single layer structure made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite with respect to 100 parts by weight of polyvinyl chloride resin can be employed. Alternatively, a thermally expandable fireproof layer made of a resin composition containing 1 to 20 parts by weight of thermally expandable graphite with respect to 100 parts by weight of polyvinyl chloride resin, and covering the inner and outer surfaces of this thermally expandable fireproof layer A three-layer structure including a coating layer of a polyvinyl chloride resin composition that does not contain thermally expandable graphite can be employed.

When the intermediate tube 18 has a single-layer structure, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expandability may not be obtained during combustion, and desired fire resistance may not be obtained. If it exceeds 100%, it may thermally expand too much due to heating, and the residue may drop out of the slab through-hole 102a without being able to retain its shape, resulting in a decrease in fire resistance.

When the intermediate pipe 18 has a multi-layer structure, the resin composition containing the thermally expandable fireproof material is not particularly limited, but 1 to 20 parts by weight of thermally expandable graphite is added to 100 parts by weight of the polyvinyl chloride resin. is preferably contained in a ratio of The content of thermally expandable graphite is more preferably 4 to 18 parts by weight, more preferably 6 to 16 parts by weight.
If the intermediate pipe 18 exists over the entire slab through-hole 102a, even if the content of the thermally expandable graphite is 15 parts by weight or more and the residue is brittle, The residue clogs the entire slab through-hole 102a, and the residue after thermal expansion is retained in the floor slab 102, making it difficult to fall off.

When the intermediate layer contains thermally expandable graphite, the intermediate layer exhibits a black color. Therefore, it is preferable that the surface layer and the inner layer contain a coloring agent other than black so as to be distinguishable from the intermediate layer.
The thicknesses of the surface layer and the inner layer are preferably 0.3 mm or more and 3.0 mm or less, and preferably 0.6 mm or more and 1.5 mm or less. If the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a pipe can be ensured, and if it is 3.0 mm or less, deterioration of fire resistance can be suppressed.
Also, the intermediate pipe 18 preferably satisfies the performance described in JIS K6741.
That is, if the amount of thermally expandable graphite is less than 1 part by weight, sufficient thermal expandability may not be obtained during combustion, and desired fire resistance may not be obtained. If the thermally expandable graphite exceeds 20 parts by weight, it may thermally expand excessively due to heating, failing to retain its shape, and the residue may fall out of the slab through-holes 102a, resulting in a decrease in fire resistance.

The thermally expandable graphite used in the present embodiment is, for example, powder such as natural flake graphite, pyrolytic graphite, Kish graphite, etc. After acid treatment of inserting an inorganic acid between graphite layers with an inorganic acid and a strong oxidizing agent, , a crystalline compound obtained by pH adjustment can be used.
Concentrated sulfuric acid, nitric acid, selenic acid and the like can be used as the inorganic acid. Concentrated nitric acid, perchloric acid, perchlorates, permanganates, bichromates, hydrogen peroxide and the like can be used as strong oxidizing agents.

Thermally expandable graphite, which is a crystalline compound that maintains the layered structure of carbon by the pH adjustment and is adjusted to a pH of 1.5 to 7.0, and a 1.3 times expansion temperature of 180 ° C. to 280 ° C. of thermally expandable graphite can be used.

When the pH of the thermally expandable graphite is less than 1.5, the acidity is too strong and corrosion of molding equipment is likely to occur. , there is a risk that sufficient fire resistance cannot be obtained.
Although the particle size of the thermally expandable graphite is not particularly limited, for example, those in the range of 100 to 400 μm, preferably 120 to 350 μm can be used.

The resin composition constituting the intermediate pipe 18 may contain stabilizers, inorganic fillers, flame retardants, lubricants, processing aids, impact modifiers, and heat-resistant improvers as needed within a range that does not impede the purpose of the present embodiment. Additives such as agents, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, and thermoplastic elastomers may be added.

A second swirl vane may be provided on the inner peripheral surface of the intermediate pipe 18 . The upper end of the intermediate pipe 18 is fitted inside the lower end of the upper connecting pipe 17 . A connecting portion between the upper connecting pipe 17 and the intermediate pipe 18 is joined with an adhesive or the like, for example.
In this embodiment, as shown in FIG. 1 , the connecting portion between the upper connecting pipe 17 and the intermediate pipe 18 is arranged in the slab through hole 102a of the floor slab 102 . A mortar 103 is filled in the slab through-hole 102a. The lower end of the upper connection pipe 17 and the upper end of the intermediate pipe 18 may be above the upper surface of the floor slab 102 .

Note that the intermediate pipe 18 may be omitted.
In that case, the upper connecting pipe 17 and the lower connecting pipe 19 are directly connected. When the connecting pipe portion 31 at the upper end of the lower connecting pipe 19 is a socket, the lower end of the upper connecting pipe 17 is used as a spigot and inserted into the lower connecting pipe 19 . When the connecting pipe portion 31 at the upper end of the lower connecting pipe 19 is a spigot, the lower end of the upper connecting pipe 17 is used as a socket, and the lower connecting pipe 19 is inserted into this lower end.
In these cases, the above-described sheet-like refractory material (hereinafter also referred to as a refractory sheet) can be wrapped around the connecting portion between the upper connecting pipe 17 and the lower connecting pipe 19 . In this case, the refractory sheet is wound around portions of the upper connection pipe 17 and the lower connection pipe 19 that are positioned below the horizontal pipe connection portion 41 . When a fireproof sheet is wound around the lower connecting pipe 19, the outer surface of the lower connecting pipe 19 in the range where the third swirl vane 34 exists is recessed (recess 32e) as will be described later, and the fireproof sheet is applied to this range. Hard to roll. Therefore, it is preferable to wrap the fireproof sheet around the area of the lower connection pipe 19 where the third swirl vane 34 does not exist. On the other hand, in the case where projections 36, which will be described later, are provided in this range, the projections 36 support the fireproof sheet. Therefore, the fireproof sheet may be wound up to the position where the third swirl vane 34 is located in the lower connecting pipe 19 .

As shown in FIGS. 2 and 3, the lower connection pipe 19 includes a connection pipe portion 31, an inclined pipe portion 32, a lower pipe portion (vertical pipe connection portion) 33, and a third swirl vane (swirl vane) . and has.

The connection pipe portion 31 is formed in a cylindrical shape and is fitted to the outside of the lower end portion of the intermediate pipe 18 (see FIG. 1). The connecting pipe portion 31 is joined to the intermediate pipe 18 by, for example, an adhesive.
The inclined tube portion 32 is formed in a cylindrical shape, and is formed so as to gradually decrease in diameter from the top to the bottom. In other words, the inclined tube portion 32 is formed such that the outer diameter and the inner diameter gradually decrease from the top to the bottom. That is, of the inner surface of the inclined tube portion 32, the inner surface other than the inner surface below the third swirl vane 34 has a tapered shape that approaches the axis O as it goes downward.
The inclined tube portion 32 is arranged coaxially with the connection tube portion 31 . The upper end portion of the inclined pipe portion 32 is fixed to the inner peripheral surface of the lower end portion of the connection pipe portion 31 . The upper end of the inclined tube portion 32 is in contact with the lower end of the intermediate tube 18 from below the intermediate tube 18 (see FIG. 1).

As shown in FIG. 2, the lower tube portion 33 is formed in a cylindrical shape. The lower tube portion 33 is arranged coaxially with the inclined tube portion 32 . The upper end portion of the lower tube portion 33 is fixed to the outer peripheral surface of the lower end portion of the inclined tube portion 32 . As shown in FIG. 1 , a vertical pipe 46 is connected to the lower pipe portion 33 .
Vertical pipes 46 are connected to the upper and lower ends of the joint body 16, respectively. Both vertical tubes 46 are arranged coaxially.

The third swirl vane 34 is fixed to a portion of the inner peripheral surface of the inclined tube portion 32 below the connection tube portion 31 . A part of the third swirl vane 34 is fixed to the inner peripheral surface of the inclined tube portion 32, and the remaining portion of the third swirl vane 34 is fixed to the inner peripheral surfaces of the connecting tube portion 31 and the lower tube portion 33. may be
As shown in FIGS. 2 and 3, the third swirl vane 34 gradually extends toward the first side X1 in the circumferential direction X from above to below. More specifically, the surface 34a of the third swirl vane 34 facing the first side X1 gradually extends toward the first side X1 from above downward. A surface 34b of the third swirl vane 34 facing the second side X2 in the circumferential direction X gradually extends toward the first side X1 from above to below.
A portion of the lower surface of the third swirl vane 34 extends toward the first side X1 as it goes downward from above, and the rest of the lower surface of the third swirl vane 34 extends along the horizontal plane. may

FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. Similarly, FIGS. 5 and 6 are cross-sectional views taken along section lines VV and VI-VI in FIG. Details of the shape of the inner peripheral surface and the outer peripheral surface of the inclined tube portion 32 will be described below.
As shown in FIGS. 2 to 6, the inner peripheral surface of the inclined tube portion 32 includes a first inner surface 32a, a second inner surface 32b, and a third inner surface 32c.
The first inner surface 32a is arranged at a portion above the third swirl vanes 34 and at a portion where the third swirl vanes 34 are not arranged in the circumferential direction. The first inner surface 32a is inclined so as to gradually approach the axis O from above to below. In other words, the first inner surface 32a is gradually inclined away from the axis O as it goes upward from below. When the lower end of the third swirl vane 34 is arranged at the upper end of the inclined tube portion 32, the first inner surface 32a may not be formed on the upper portion of the third swirl vane 34.

The second inner surface 32b is arranged below the third swirl vane 34 . As shown in FIGS. 4 to 6, the second inner surface 32b is gradually inclined away from the axis O from above to below. The second inner surface 32b protrudes below the surface 34b of the third swirl vane 34 . The second inner surface 32b protrudes radially inward from the first inner surface 32a.
As shown in FIG. 2, the third inner surface 32c extends radially outward from the end of the second inner surface 32b on the second side X2 in the circumferential direction. The third inner surface 32c faces the second side X2 and is parallel to the axis O. As shown in FIG. In addition, the third inner surface 32c may gradually incline toward the second side X2 in the circumferential direction X as it goes downward.

As shown in FIGS. 4 and 7, the outer peripheral surface of the inclined tube portion 32 has a first outer surface 32d (at least part of the outer peripheral surface of the inclined tube portion). The first outer surface 32d is arranged radially outward of the second inner surface 32b. 32 d of 1st outer surfaces incline so that it may be spaced apart from the axis O gradually as it goes to the downward direction from the upper part. That is, in the cross section shown in FIG. 4, the first outer surface 32d and the second inner surface 32b are parallel to each other, and the thickness of the inclined tube portion 32 sandwiched between the first outer surface 32d and the second inner surface 32b is constant. The first outer surface 32d is formed over the entire range corresponding to the second inner surface 32b.
That is, in the inclined tube portion 32 formed in a cylindrical shape, the inner peripheral surface and the outer peripheral surface of the portion corresponding to the second inner surface 32b are recessed toward the axis O. As shown in FIG. A portion corresponding to the second inner surface 32b of the inclined tube portion 32 is so-called thinned. In other words, a dent 32 e that is dented toward the axis O is formed on the outer peripheral surface of the inclined tube portion 32 .

As shown in FIGS. 4 and 7, the first outer surface 32d of the inclined tube portion 32 is formed with a plurality of protrusions 36 protruding radially outward. The plurality of protrusions 36 extend in the circumferential direction and are arranged at intervals in the vertical direction. By forming the projecting portion 36 , the strength of the inclined tube portion 32 is improved, and there is an effect of suppressing the vibration generated when the third swirl vane 34 is drained. Furthermore, as described above, when a fireproof sheet is wrapped around the lower connecting pipe 19, there is also an effect of holding the fireproof sheet and the sound insulating cover provided around the inclined pipe portion 32. FIG.
Note that the first outer surface 32d may be formed in a part of the range corresponding to the second inner surface 32b.

The connection pipe portion 31, the inclined pipe portion 32, the lower pipe portion 33, and the third swirl vane 34, which constitute the lower connection pipe 19, are integrally formed by, for example, injection molding of vinyl chloride resin or the like.
The joint body 16 is composed of three members, an upper connecting pipe 17 , an intermediate pipe 18 and a lower connecting pipe 19 . Note that the joint body may be composed of two or four or more members, or the joint body may be integrally composed of one member.
Moreover, the upper connection pipe 17 and the lower connection pipe 19 may be made transparent. Thereby, the connection state of the upper connection pipe 17, the intermediate pipe 18, and the lower connection pipe 19 can be visually recognized from the outside.

A sound insulation cover may be provided on the outer peripheral surface of the joint body 16 as a measure for sound insulation. The sound insulation cover is formed of, for example, a sheet of soft vinyl chloride, butyl rubber, or polypropylene (PP) resin having a thickness of 0.8 to 2 mm. The sound insulating cover may be a laminate in which a sound absorbing layer such as polyester fiber, urethane foam, or glass wool or rock wool having a thickness of 5 to 20 mm is provided inside the above sheet.
Further, the recess 32e provided on the outer surface of the inclined pipe portion 32 of the lower connection pipe 19 may be filled with the material constituting the sound absorbing layer to eliminate the recess 32e in appearance. As a result, the sound insulating cover provided around the lower connecting pipe 19 can be supported by the filled material.

Next, a method for manufacturing the lower connection pipe 19 configured as above will be described.
As shown in FIG. 8, the lower connection pipe 19 is formed by injection molding using a mold 51. As shown in FIG. For example, the mold 51 includes a first core 52 , a second core 53 , a first cavity 54 and a second cavity 55 .
In a general mold, the parting line between the cores is the line L shown in FIG. However, in the mold 51, the concave portion 52a is formed in the first core 52, and the convex portion 53a corresponding to the concave portion 52a is formed in the second core 53. As shown in FIG. The protrusion 53a jumps over the line L into the recess 52a, and the third swirl vane 34 is formed between the protrusion 53a and the recess 52a.

The first core 52 forms the surface 34 a of the third swirl vane 34 and the first inner surface 32 a of the inclined tube portion 32 . The convex portion 53 a of the second core 53 forms the surface 34 b of the third swirl vane 34 and the second inner surface 32 b of the inclined tube portion 32 .
After the lower connection pipe 19 is formed in the mold 51 , the first core 52 is moved upward with respect to the lower connection pipe 19 to remove the first core 52 from the lower connection pipe 19 . Similarly, the second core 53 is moved downward with respect to the lower connecting pipe 19 to remove the second core 53 from the lower connecting pipe 19 . The first cavity 54 is moved to the left with respect to the lower connecting pipe 19 to remove the first cavity 54 from the lower connecting pipe 19 . The second cavity 55 is moved to the right side with respect to the lower connecting pipe 19 to remove the second cavity 55 from the lower connecting pipe 19 .
Thus, the lower connecting pipe 19 is manufactured by injection molding.

As described above, according to the collective joint 11 of the present embodiment, the first inner surface 32a of the inclined tube portion 32 is gradually inclined away from the axis O as it goes upward from below. Therefore, after the first inner surface 32a is formed using the first core 52 of the mold 51 and the lower connection pipe 19 of the collective joint 11 is formed by injection molding, the first core 52 is attached to the lower connection pipe 19. The first core 52 can be removed from the lower connecting pipe 19 by moving upward. The second inner surface 32b of the inclined tube portion 32 is arranged below the third swirl vane 34 and is inclined so as to gradually separate from the axis O as it goes downward. Therefore, after the second inner surface 32b is formed using the second core 53 of the mold 51 and the lower connection pipe 19 is formed by injection molding, the second core 53 is moved downward with respect to the lower connection pipe 19. The second core 53 can be removed from the lower connecting tube 19 .

In this manner, the second inner surface 32b, which is a part of the inner peripheral surface of the inclined tube portion 32 and is arranged below the third swirl vane 34, can be formed using the second core 53. A large space below the third swirl vane 34 in the pipe portion 32 can be secured.
When the waste water flows into the collecting joint 11, the waste water hits the surface 34a of the third swirl vane 34 and flows spirally so as to swirl. Since the space arranged below the third swirl vane 34 makes it difficult for the flow of waste water to be obstructed, the drainage performance of the collective joint 11 can be enhanced.

32 d of 1st outer surfaces arrange|positioned at the radial direction outer side of the 2nd inner surface 32b incline so that it may separate from the axis O gradually as it goes to the downward direction from the upper part. As a result, the thickness in the radial direction of the inclined tube portion 32 disposed between the second inner surface 32b and the first outer surface 32d is reduced, and sink marks or the like are generated in this portion formed by injection molding, resulting in defective molding. can be prevented from becoming
The inner peripheral surface of the inclined tube portion 32 has a third inner surface 32c. Therefore, the first inner surface 32a and the second inner surface 32b of the inclined tube portion 32 can be connected by the third inner surface 32c.

The surfaces 34a and 34b of the third swirl vane 34 gradually extend toward the first side X1 from above to below. Therefore, it is possible to reduce the thickness of the third swirl vane 34, thereby suppressing defective molding caused by sink marks or the like in this portion formed by injection molding. Further, the space below the third swirl vane 34 in the inclined tube portion 32 can be secured widely, and the drainage performance of the collective joint 11 can be further enhanced.

As described above, one embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and the configuration can be changed, combined, or deleted without departing from the scope of the present invention. etc. are also included.
For example, in the above-described embodiment, the outer peripheral surface of the inclined tube portion 32 arranged radially outward of the second inner surface 32b may have a flat shape along the axis O, or the like.
Also, the surface 34a or the surface 34b of the third swirl vane 34 may be a curved surface that curves upward or downward instead of being flat. Further, the surface 34a or the surface 34b may be formed with continuous or discontinuous protrusions or recesses.
Further, in the above-described embodiment, the protrusions 36 arranged radially outward of the second inner surface 32b extend in the circumferential direction X and are spaced apart from each other in the vertical direction. However, the protrusions 36 may extend in the vertical direction (tube axis direction), or both the protrusions 36 extending in the circumferential direction X and the protrusions 36 extending in the vertical direction may be provided.

The connection pipe portion 31 and the lower pipe portion 33 are sockets, but they may be spigots.
When the connecting pipe portion 31 is a spigot, the intermediate pipe 18 can be omitted and the connecting pipe portion 31 can be inserted into the lower end (receptacle) of the upper connecting pipe 17 as described above.
When the lower pipe portion 33 is a spigot, it can be configured like a lower connecting pipe 19A according to another embodiment shown in FIGS. In the lower connection pipe 19A, the upper end of the vertical pipe 46A located below the collective joint 11 is used as a socket 46a, and the lower pipe portion 33 is inserted into the socket 46a. In the illustrated example, the diameter (outer diameter, inner diameter) of the lower tube portion 33 is the same as the diameter of the lower end of the inclined tube portion 32 .

As shown in FIG. 10, when the upper end of the vertical pipe 46A is a socket 46a, a rubber ring 46b can be provided in the socket 46a to improve water cutoff. In the illustrated example, the inner diameter of the socket 46 a is larger than the outer diameter of the lower tube portion 33 . The rubber ring 46b is fitted into the socket 46a from the inside and fitted into the lower tube portion 33 from the outside. In other words, the rubber ring 46 b is sandwiched between the socket 46 a and the lower tube portion 33 . As a result, the rubber ring 46b exhibits water stopping properties.

By the way, in the lower connecting pipe 19A, for example, due to unexpected movement of the vertical pipe 46A and the lower connecting pipe 19, the rubber ring 46b may move to the inclined pipe portion instead of the outer peripheral surface of the lower pipe portion 33. 32 may be fitted. This kind of unexpected movement is caused, for example, by thermal expansion and contraction of the vertical pipe 46A, movement by an operator, or the like.
Here, when the rubber ring 46b is fitted to the outer peripheral surface of the inclined pipe portion 32, the rubber ring 46b may be positioned at the height position of the recess 32e formed by the third swirl vane 34 in the lower connecting pipe 19. . In this case, a gap is generated between the rubber ring 46b and the lower pipe portion 33, and the water stopping property of the rubber ring 46b is impaired.
Therefore, means for restricting the relative movement of the vertical pipe 46A and the lower connecting pipe 19 (hereinafter referred to as restricting means 60) is provided. As a result, the rubber ring 46b and the recess 32e are regulated from overlapping each other, and the water stopping property of the rubber ring 46b is ensured.

Specific examples of the regulating means 60 are shown in FIGS. 11 to 14 below.

A restricting means 60A shown in FIG. 11 is provided on the lower connecting pipe 19B. 60 A of control means are provided in the connection part of the inclination pipe part 32 and the lower side pipe part 33 in the lower connection pipe 19B. In other words, 60 A of control means are located below the height of the recess 32e. 60 A of control means are protrusions which protrude to the outer side of a radial direction. In the illustrated example, the regulating means 60A is provided over the entire circumference in the circumferential direction X. As shown in FIG. In this case, when unexpected movement as described above is about to occur, the upper end of the vertical tube 46A contacts the lower surface of the restricting means 60A, and further movement is restricted.

60C of control means shown in FIG. 12 are provided in the vertical tube 46B. 60 C of control means are provided in the upper end in the vertical tube 46B. The restricting means 60C is a protrusion that protrudes radially inward. In the illustrated example, the regulating means 60C is provided over the entire circumference in the circumferential direction X. As shown in FIG. The inner diameter of the restricting means 60C is the same as the outer diameter of the lower tube portion 33 . In this case, when unexpected movement as described above is about to occur, the restricting means 60C contacts the lower end of the inclined tube portion 32 to restrict further movement.

A restriction means 60D shown in FIG. 13 is provided on the vertical pipe 46C. In this modification, the shape of socket 46a is different from other modifications. That is, the inner diameter of the socket 46 a in this modified example is the same as the outer diameter of the lower tube portion 33 . An annular recess 46c extending in the circumferential direction X is provided on the inner peripheral surface of the socket 46a. The rubber ring 46b is fitted in the recess 46c. The restricting means 60D is formed by the upper end of the vertical tube 46C. In this case, when an unexpected movement as described above is about to occur, as in the modification shown in FIG. movement is restricted.

The restricting means 60E shown in FIG. 14 is provided on the rubber ring 46b. The restricting means 60E is provided at the lower end of the rubber ring 46b. The restricting means 60E is a protrusion that protrudes radially inward. In the illustrated example, the regulating means 60E is provided over the entire circumference in the circumferential direction X. As shown in FIG. The inner diameter of the restricting means 60E is equal to or less than the outer diameter of the lower tube portion 33 . In this case, when unexpected movement as described above is about to occur, the restricting means 60E contacts the lower end of the lower tube portion 33 to restrict further movement. In this case, the distance L1 from the restricting means 60E to the lower end of the lower tube portion 33 is preferably shorter than the distance L0 from the upper end of the vertical tube 46A to the recess 32e (L1<L0). Further, the restriction means 60E may be formed by a stepped portion 46d provided at the proximal end of the socket 46a, or may be provided as a projection inside the socket 46a. In these cases, the inner diameter of the socket 46a may be equal to the outer diameter of the lower tube portion 33, as in a vertical tube 46C shown in FIG.

The collective joint 11 does not have to include the vertical pipe connection portion 23 and the horizontal pipe connection portion 41 .
The position where the swirl vanes are provided in the joint main body 16 is not particularly limited, and may be the same position as the horizontal pipe connecting portion 41 in the vertical direction.
It is assumed that the joint main body 16 is formed in a circular tubular shape. However, the shape of the joint main body is not limited to this, and the joint main body may be formed in an elliptical tubular shape, a square tubular shape, or the like.

11 collective joint 16 joint main body 32 inclined pipe portion 32a first inner surface 32b second inner surface 32c third inner surface 32d first outer surface (at least part of the outer peripheral surface of the inclined pipe portion)
34 third swirl vane (swirl vane)
O Axis X Circumferential direction X1 First side X2 Second side

Claims (3)

a joint body formed in a tubular shape and arranged so that the axis extends along the vertical direction;
a swirl vane provided on the inner peripheral surface of the joint body;
with
The swirl vane gradually extends toward the first side in the circumferential direction as it goes downward from above,
The joint body has an inclined pipe portion whose diameter gradually decreases from the top to the bottom,
at least part of the swirl vane is provided on the inner peripheral surface of the inclined tube portion,
The inner peripheral surface of the inclined tube portion is
a first inner surface that is inclined so as to gradually approach the axis from above to below;
a second inner surface disposed in a lower portion of the swirl vane and gradually inclined away from the axis as it goes downward from above;
A collection joint with 2. The apparatus according to claim 1, wherein at least a portion of the outer peripheral surface of the inclined tube portion disposed radially outward of the second inner surface is gradually inclined away from the axis as it goes downward from above. Collective joint. 3. The assembly according to claim 1, wherein the inner peripheral surface of the inclined tube portion has a third inner surface extending radially outward from the end of the second inner surface on the second side in the circumferential direction and facing the second side. fittings.