JP2021193316A - Collecting joint - Google Patents

Abstract

To provide a collecting joint of which the drain performance is improved by securing a wide space at a lower side of a swirl vane inside of an inclined pipe part in a case where the collecting joint is formed by injection molding.SOLUTION: A collecting joint 11 comprises: a joint body 16 formed tubular and disposed in such a manner that an axis O is located in a vertical direction; and a swirl vane 34 provided on an inner peripheral surface of the joint body. The swirl vane extends toward a first side in a circumferential direction gradually from an upper side to a lower side, and the joint body includes an inclined pipe part 32 of which the diameter is reduced gradually from the upper side to the lower side. At least a portion of the swirl vane is provided on an inner peripheral surface of the inclined pipe part. The inner peripheral surface of the inclined pipe part includes: a first inner surface 32a which is inclined so as to get closer to the axis gradually from the upper side to the lower side; and a second inner surface 32b which is disposed in a lower portion of the swirl vane and inclined so as to get separate from the axis gradually from the upper side to the lower side.SELECTED DRAWING: Figure 4

Description

The present invention relates to a collective joint.

Conventionally, buildings such as apartment houses and office buildings are provided with a collective joint system such as a drainage channel (see, for example, Patent Documents 1 and 2). For example, a collective joint system has a horizontal pipe that collects drainage on each floor of a building, a vertical pipe that drains the drainage collected by each horizontal pipe downward, and a collective joint that connects the horizontal pipe and the vertical pipe. I have.

The collective joint includes a joint body formed in a tubular shape, a horizontal pipe connecting portion provided on the outer peripheral surface of the joint body, and a swivel blade provided on the inner peripheral surface of the joint body.
The joint body is arranged so that the axis is along the vertical direction. The joint main 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 upper side to the lower side.
At least a part of the swivel blade is arranged on the inner peripheral surface of the inclined pipe 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 connection portion.

The 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 swivel blade and flows spirally along the upper surface of the swirl blade. While the drainage spirally flows down in the joint body of the collective joint, the air in the joint body flows upward in the space where the drainage does not flow.
In this way, the collective joint system can improve the drainage performance, which is the flow rate of the drainage flowing inside while suppressing the pressure difference generated inside.

Japanese Unexamined Patent Publication No. 2000-096646 Japanese Unexamined Patent Publication No. 2001-173866

The collective joint disclosed in Patent Documents 1 and 2 was formed of cast iron or the like by casting, but recently, instead of casting, the collective joint is formed of resin or the like by injection molding. At this time, since the inclined pipe portion is formed as described above, the space above the swivel blade in the inclined pipe portion is formed by using the core of the mold, and the collective joint is formed by injection molding and then assembled. It is easy to move this core upwards with respect to the joint and remove the core from the collective joint.
However, even if the space below the swivel blade in the inclined pipe portion is formed by using the core, the core cannot be moved upward because the core is locked to the swivel blade, while the inclined pipe portion is formed. Since the diameter of the core is reduced downward, the core cannot be moved downward, and it is difficult to remove the core from the collective joint after forming the collective joint by injection molding.

The present invention has been made in view of such a problem, and when the collective joint is formed by injection molding, a wide space under the swivel blade in the inclined pipe portion is secured to improve the drainage performance. It is intended to provide an assembly joint.

In order to solve the above problems, the present invention proposes the following means.
The collective joint of the present invention includes a joint body which is formed in a tubular shape and has an axis arranged along the vertical direction, and a swivel blade provided on the inner peripheral surface of the joint body. The joint body gradually extends from the upper side toward the first side in the circumferential direction from the upper side to the lower side, and the joint body has an inclined pipe portion whose diameter gradually decreases from the upper side to the lower side, and at least a part of the swivel blades. The inner peripheral surface of the inclined pipe portion is provided on the inner peripheral surface of the inclined pipe portion, and the inner peripheral surface of the inclined pipe portion is gradually inclined from above to downward so as to approach the axis line, and the first inner surface and the lower portion of the swivel blade. It is characterized by having a second inner surface which is arranged in the portion and is gradually inclined so as to be separated from the axis line from the upper side to the lower side.
The lower part of the swivel blade referred to here is not only a part arranged below any part of the swivel blade but also a part below a part of the swivel blade, but other parts of the swivel blade. For some parts, it means that the parts that are not arranged below are also included.

According to the present invention, the first inner surface of the inclined pipe portion is gradually inclined so as to be separated from the axis line from the lower side to the upper side. Therefore, the first inner surface is formed by using, for example, the first core of the mold, the collective joint is formed by injection molding, and then the first core is moved upward with respect to the collective joint to be the first from the collective joint. The core can be removed. Further, the second inner surface of the inclined pipe portion is arranged below the swirling blade, and gradually inclines so as to be separated from the axis line toward the lower side. Therefore, the second inner surface is formed by using, for example, the second core of the mold, the collective joint is formed by injection molding, and then the second core is moved downward with respect to the collective joint to be second from the collective joint. The core can be removed.

As described above, since the second inner surface which is a part of the inner peripheral surface of the inclined pipe portion and is arranged below the swivel blade can be formed by using the second core, the swivel blade in the inclined pipe portion can be formed. A large space below can be secured.
For example, when the drainage flows into the collective joint, the drainage spirally flows so as to hit the surface of the swivel blade facing the first side in the circumferential direction and swirl. Since the space arranged below the swivel blades makes it difficult for the drainage flow to be obstructed, the drainage performance of the collective joint can be improved.

Further, in the above-mentioned collective joint, at least a part of the outer peripheral surface of the inclined pipe portion arranged on the radial outer side of the second inner surface is gradually inclined away from the axis line from the upper side to the lower side. May be.
According to the present invention, the radial thickness of the inclined pipe portion arranged between the second inner surface and at least a part of the outer peripheral surface of the inclined pipe portion arranged on the radial outer side of the second inner surface is determined. By making it thinner, it is possible to prevent sink marks and the like from occurring in this portion formed by injection molding, resulting in molding defects.

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

According to the collective joint of the present invention, when the collective joint is formed by injection molding, it is possible to secure a wide space below the swivel blade in the inclined pipe portion and improve the drainage performance.

It is a side view of a part of the collective joint system in which the collective joint of one embodiment of the present invention is used. It is a perspective view which a part of the lower connection pipe of the collective joint was broken. It is a top view of the lower connection pipe. It is sectional drawing of the cutting line IV-IV in FIG. It is sectional drawing of the cutting line VV in FIG. It is sectional drawing of the cutting line VI-VI in FIG. It is a side view of the lower connection pipe. It is sectional drawing of the mold for forming the lower connecting pipe by injection molding. It is sectional drawing of the lower connection pipe of the collective joint of another embodiment of this invention, and is the figure corresponding to the sectional drawing shown in FIG. It is sectional drawing which shows the state which the lower connecting pipe shown in FIG. 9 is connected to a vertical pipe. It is sectional drawing which shows the lower connection pipe and the vertical pipe which constitutes the collective joint system of the 1st modification of this invention. It is sectional drawing which shows the lower connection pipe and the vertical pipe which constitutes the collective joint system of the 2nd modification of this invention. It is sectional drawing which shows the lower connection pipe and the vertical pipe which constitutes the collective joint system of the 3rd modification of this invention. It is sectional drawing which shows the lower connection pipe and the vertical pipe which constitutes the collective joint system of the 4th modification of this invention.

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

The collective joint system 1 includes an collective joint 11, a vertical pipe 46, and a horizontal pipe 48.
The collective joint 11 includes a joint main body 16 and a horizontal pipe connecting portion 41. The joint body 16 is formed in a circular tube shape, and the axis O is arranged 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.
The joint body 16 includes an upper connecting pipe 17 and a lower connecting pipe 19 connected to the upper connecting pipe 17 via an intermediate pipe 18.
A horizontal pipe connecting portion 41 is fixed to the outer peripheral surface of the upper connecting pipe 17. In the present embodiment, a plurality of horizontal 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 weir plate 22 is fixed to the inner peripheral surface of the upper connecting pipe 17. The weir plate 22 suppresses the backflow of drainage into the horizontal pipe 48.
The upper connecting pipe 17 is made of vinyl chloride resin or the like.

A vertical pipe connecting portion 23 is attached to the upper end portion of the upper connecting pipe 17. The vertical pipe connecting portion 23 includes a first swivel vane 24. The first swivel 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 connecting 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 connecting pipe 19 are arranged below the horizontal pipe connecting portion 41.
The intermediate tube 18 is preferably made of a polyvinyl chloride-based resin and contains a resin composition containing a polyvinyl chloride-based resin and heat-expandable graphite. That is, the intermediate tube 18 is manufactured by molding a resin composition. Usually, the intermediate tube 18 is made by extrusion molding a resin composition.
Further, the intermediate tube 18 may have a single-layer structure in which the entire intermediate tube 18 is made of a resin composition, or may be a multi-layer structure composed of a plurality of layers. In the case of a multi-layer structure, any layer may be formed from the resin composition. For example, when the intermediate tube 18 has a three-layer structure including a surface layer, an intermediate layer, and an inner layer, the intermediate layer may be formed from a resin composition, and the surface layer, the intermediate layer, and the inner layer may contain an endothermic agent. It may be contained.
When the intermediate tube 18 does not contain the heat-expandable graphite, a sheet-shaped refractory material containing the heat-expandable graphite is wound around the outer surface of the intermediate tube 18 or the outer surface of the sound insulating material covering the intermediate tube 18 to prevent fire. The 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 heat-expandable graphite with respect to 100 parts by weight of a polyvinyl chloride resin can be adopted. Alternatively, the heat-expandable fire-resistant layer made of a resin composition containing 1 to 20 parts by weight of heat-expandable graphite with respect to 100 parts by weight of the polyvinyl chloride resin and the inner and outer surfaces of the heat-expandable fire-resistant layer are covered. A three-layer structure composed of a coating layer of a polyvinyl chloride resin composition containing no heat-expandable graphite can be adopted.

When the intermediate tube 18 has a single-layer structure, if the amount of the heat-expandable graphite is less than 1 part by weight, sufficient heat-expandability may not be obtained at the time of combustion, and the desired fire resistance may not be obtained. If it exceeds the portion, the thermal expansion may be excessive due to heating, the shape may not be maintained, and the residue may fall out of the slab through hole 102a, resulting in a decrease in fire resistance.

When the intermediate tube 18 has a multi-layer structure, the resin composition containing the heat-expandable refractory material is not particularly limited, but 1 to 20 parts by weight of the heat-expandable graphite is added to 100 parts by weight of the polyvinyl chloride-based resin. It is preferable to include it in the ratio of. The content of the heat-expandable graphite is more preferably 4 to 18 parts by weight, still more preferably 6 to 16 parts by weight.
If the intermediate tube 18 is present over the entire slab through hole 102a, even if the content of the heat-expandable graphite is relatively large at 15 parts by weight or more and the residue is brittle. The residue closes the entire slab through hole 102a, and the residue after thermal expansion is retained in the floor slab 102, so that it can be prevented from falling off.

When the intermediate layer contains heat-expandable graphite, the intermediate layer exhibits a black color. Therefore, it is preferable that the surface layer and the inner layer contain a colorant other than black so as to be distinguishable from the intermediate layer.
The thickness of the surface layer and the inner layer is 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, respectively. When the thickness of the coating layer is 0.3 mm or more, sufficient mechanical strength as a pipe can be secured, and when it is 3.0 mm or less, deterioration of fire resistance can be suppressed.
Further, the intermediate tube 18 preferably satisfies the performance described in JIS K6741.
That is, if the amount of the heat-expandable graphite is less than 1 part by weight, sufficient heat-expandability may not be obtained at the time of combustion, and the desired fire resistance may not be obtained. If the amount of the heat-expandable graphite exceeds 20 parts by weight, the heat expands too much due to heating, the shape cannot be maintained, and the residue may fall out from the slab through hole 102a, resulting in a decrease in fire resistance.

The heat-expandable graphite used in the present embodiment is, for example, after an acid treatment of powders such as natural scale graphite, pyrolytic graphite, and kiss graphite with an inorganic acid and a strong oxidizing agent to insert the inorganic acid between the layers of the graphite. , A crystalline compound obtained by adjusting the pH can be used.
As the inorganic acid, concentrated sulfuric acid, nitric acid, selenic acid and the like can be used. As the strong oxidizing agent, concentrated nitrate, perchloric acid, perchlorate, permanganate, dichromate, hydrogen peroxide and the like can be used.

It is a crystalline compound that maintains the layered structure of carbon by the pH adjustment, and is a heat-expandable graphite whose pH is adjusted to 1.5 to 7.0, and its 1.3-fold expansion temperature is 180 ° C to 280 ° C. The heat-expandable graphite of can be used.

If the pH of the heat-expandable graphite is less than 1.5, the acidity is too strong and easily causes corrosion of the molding apparatus, and if the pH exceeds 7.0, the carbonization promoting effect of the polyvinyl chloride resin is weakened. , There is a risk that sufficient fire resistance will not be obtained.
The particle size of the heat-expandable graphite is not particularly limited, but 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 tube 18 contains a stabilizer, an inorganic filler, a flame retardant, a lubricant, a processing aid, an impact modifier, and heat resistance improvement, if necessary, as long as the object of the present embodiment is not impaired. Additives such as agents, antioxidants, light stabilizers, UV absorbers, pigments, plasticizers, thermoplastic elastomers and the like may be added.

A second swivel blade may be provided on the inner peripheral surface of the intermediate pipe 18. The upper end portion of the intermediate pipe 18 is fitted inside the lower end portion of the upper connecting pipe 17. The connecting portion between the upper connecting pipe 17 and the intermediate pipe 18 is joined by, for example, an adhesive or the like.
In the present 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. The slab through hole 102a is filled with mortar 103. The lower end of the upper connecting pipe 17 and the upper end of the intermediate pipe 18 may be above the upper surface of the floor slab 102.

The intermediate tube 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 receiving port, the lower end of the upper connecting pipe 17 is used as a spout and is 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 receiving port, and the lower connecting pipe 19 is inserted into the lower end.
In these cases, the above-mentioned sheet-shaped refractory material (hereinafter, also referred to as a refractory sheet) can be wound around the connection portion between the upper connecting pipe 17 and the lower connecting pipe 19. In this case, the refractory sheet is wound around a portion of the upper connecting pipe 17 and the lower connecting pipe 19 located below the horizontal pipe connecting portion 41. When the 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 swivel blade 34 exists is recessed (recessed 32e), and the fireproof sheet is in this range. Difficult to wind. Therefore, it is preferable to wind the refractory sheet in the range of the lower connecting pipe 19 where the third swivel blade 34 does not exist. On the other hand, when the protrusion 36 described later is provided in this range, the fireproof sheet is supported by the protrusion 36. Therefore, the refractory sheet may be wound up to the position where the third swivel blade 34 is located in the lower connecting pipe 19.

As shown in FIGS. 2 and 3, the lower connecting pipe 19 includes a connecting pipe portion 31, an inclined pipe portion 32, a lower pipe portion (vertical pipe connecting portion) 33, and a third swivel vane (swivel vane) 34. And have.

The connecting 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 with, for example, an adhesive.
The inclined pipe portion 32 is formed in a cylindrical shape, and is formed so that the diameter gradually decreases from the upper side to the lower side. In other words, the inclined pipe portion 32 is formed so that the outer diameter and the inner diameter gradually decrease from the upper side to the lower side. That is, of the inner surface of the inclined pipe portion 32, the inner surface other than the inner surface below the third swivel blade 34 is tapered so as to approach the axis O as it goes downward.
The inclined pipe portion 32 is arranged coaxially with the connecting pipe 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 connecting pipe portion 31. The upper end portion of the inclined pipe portion 32 is in contact with the lower end portion of the intermediate pipe 18 from below the intermediate pipe 18 (see FIG. 1).

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

The third swivel blade 34 is fixed to a portion of the inner peripheral surface of the inclined pipe portion 32 below the connecting pipe portion 31. A part of the third swivel blade 34 is fixed to the inner peripheral surface of the inclined pipe portion 32, and the rest of the third swivel blade 34 is fixed to the inner peripheral surface of the connecting pipe portion 31 and the lower pipe portion 33. May be.
As shown in FIGS. 2 and 3, the third swivel vane 34 gradually extends from the upper side toward the first side X1 in the circumferential direction X from the upper side to the lower side. More specifically, the surface 34a of the third swivel blade 34 facing the first side X1 gradually extends toward the first side X1 from the upper side to the lower side. The surface 34b of the third swivel blade 34 facing the second side X2 in the circumferential direction X gradually extends toward the first side X1 from the upper side to the lower side.
A part of the lower surface of the third swivel blade 34 gradually extends toward the first side X1 from the upper side to the lower side, and the rest of the lower surface of the third swivel blade 34 extends along the horizontal plane. You may.

FIG. 4 is a cross-sectional view of the cutting line IV-IV in FIG. Similarly, FIGS. 5 and 6 are cross-sectional views of the cutting line VV and the cutting line VI-VI in FIG. Hereinafter, the details of the shapes of the inner peripheral surface and the outer peripheral surface of the inclined pipe portion 32 will be described.
As shown in FIGS. 2 to 6, the inner peripheral surface of the inclined pipe 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 in a portion above the third swivel blade 34 and a portion in which the third swivel blade 34 is not arranged in the circumferential direction. The first inner surface 32a is gradually inclined so as to approach the axis O from the upper side to the lower side. In other words, the first inner surface 32a is gradually inclined so as to be separated from the axis O from the lower side to the upper side. When the lower end of the third swivel blade 34 is arranged at the upper end of the inclined pipe portion 32, the first inner surface 32a may not be formed on the upper portion of the third swivel blade 34.

The second inner surface 32b is arranged in a lower portion of the third swivel blade 34. As shown in FIGS. 4 to 6, the second inner surface 32b is gradually inclined so as to be separated from the axis O from the upper side to the lower side. The second inner surface 32b projects below the surface 34b of the third swivel blade 34. The second inner surface 32b projects 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 side X2 in the circumferential direction on the second inner surface 32b. The third inner surface 32c faces the second side X2 and is parallel to the axis O. The third inner surface 32c may be gradually tilted 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 pipe portion 32 includes a first outer surface 32d (at least a part of the outer peripheral surface of the inclined pipe portion). The first outer surface 32d is arranged on the radial outer side of the second inner surface 32b. The first outer surface 32d is gradually inclined so as to be separated from the axis O from the upper side to the lower side. 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 pipe 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 pipe 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. In the portion of the inclined pipe portion 32 corresponding to the second inner surface 32b, so-called meat stealing is performed. In other words, a recess 32e that is recessed toward the axis O is formed on the outer peripheral surface of the inclined pipe portion 32.

As shown in FIGS. 4 and 7, a plurality of protrusions 36 projecting outward in the radial direction are formed on the first outer surface 32d of the inclined pipe portion 32. The plurality of protrusions 36 extend in the circumferential direction and are arranged so as to be spaced apart from each other in the vertical direction. By forming the protrusion 36, the strength of the inclined pipe portion 32 is improved, and there is an effect of suppressing the vibration generated when the drainage is on the third swivel blade 34. Further, as described above, when the fireproof sheet is wound around the lower connecting pipe 19, it also has the effect of holding the fireproof sheet and the sound insulating cover provided around the inclined pipe portion 32.
The first outer surface 32d may be formed in a part of the range corresponding to the second inner surface 32b.

The connecting pipe portion 31, the inclined pipe portion 32, the lower pipe portion 33, and the third swivel blade 34 constituting the lower connecting pipe 19 are integrally formed by injection molding, for example, 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. The joint body may be composed of two or four or more members, or the joint body may be integrally composed of one member.
Further, the upper connecting pipe 17 and the lower connecting pipe 19 may be made transparent. Thereby, the connection state of the upper connecting pipe 17, the intermediate pipe 18, and the lower connecting 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 sound insulation measure. The sound insulation cover is formed of, for example, a sheet made of soft vinyl chloride, butyl rubber, or polypropylene (PP) resin having a thickness of 0.8 to 2 mm. The sound insulation cover may be a laminated body in which a polyester fiber having a thickness of 5 to 20 mm, a urethane foam, or a sound absorbing layer such as glass wool or rock wool is provided inside the above sheet.
Further, the recess 32e provided on the outer surface of the inclined pipe portion 32 of the lower connecting pipe 19 may be filled with the material constituting the sound absorbing layer to eliminate the recess 32e in appearance. Thereby, the sound insulation cover provided around the lower connecting pipe 19 can be supported by the filled material.

Next, a method of manufacturing the lower connecting pipe 19 configured as described above will be described.
As shown in FIG. 8, the lower connecting pipe 19 is formed by injection molding using a mold 51. 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 like the line L shown in FIG. 8, which is the connecting portion between the inclined pipe portion 32 and the lower pipe portion 33 in the lower connecting pipe 19. 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. The convex portion 53a jumps over the line L toward the concave portion 52a, and forms a third swivel blade 34 between the convex portion 53a and the concave portion 52a.

The first core 52 forms a surface 34a of the third swivel blade 34 and a first inner surface 32a of the inclined pipe portion 32. The convex portion 53a of the second core 53 forms the surface 34b of the third swivel blade 34 and the second inner surface 32b of the inclined pipe portion 32.
After forming the lower connecting pipe 19 in the mold 51, the first core 52 is moved upward with respect to the lower connecting pipe 19 and the first core 52 is removed from the lower connecting pipe 19. Similarly, the second core 53 is moved downward with respect to the lower connecting pipe 19, and the second core 53 is removed from the lower connecting pipe 19. The first cavity 54 is moved to the left side with respect to the lower connecting pipe 19, and the first cavity 54 is removed from the lower connecting pipe 19. The second cavity 55 is moved to the right side with respect to the lower connecting pipe 19, and the second cavity 55 is removed from the lower connecting pipe 19.
In this way, 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 pipe portion 32 is gradually inclined so as to be separated from the axis O from the lower side to the upper side. Therefore, the first inner surface 32a is formed by using the first core 52 of the mold 51, the lower connecting pipe 19 of the collective joint 11 is formed by injection molding, and then the first core 52 is formed with respect to the lower connecting pipe 19. The first core 52 can be removed from the lower connecting pipe 19 by moving it upward. Further, the second inner surface 32b of the inclined pipe portion 32 is arranged below the third swivel blade 34, and is gradually inclined away from the axis O as it goes downward. Therefore, the second inner surface 32b is formed by using the second core 53 of the mold 51, the lower connecting pipe 19 is formed by injection molding, and then the second core 53 is moved downward with respect to the lower connecting pipe 19. The second core 53 can be removed from the lower connecting pipe 19.

As described above, since the second inner surface 32b, which is a part of the inner peripheral surface of the inclined pipe portion 32 and is arranged below the third swivel blade 34, can be formed by using the second core 53, it is inclined. It is possible to secure a wide space below the third swivel blade 34 in the pipe portion 32.
When the drainage flows into the collective joint 11, the drainage spirally flows so as to hit the surface 34a of the third swivel blade 34 and swirl. Since the space arranged below the third swivel blade 34 makes it difficult for the drainage flow to be obstructed, the drainage performance of the collective joint 11 can be improved.

The first outer surface 32d arranged on the radial outer side of the second inner surface 32b is gradually inclined so as to be separated from the axis O from the upper side to the lower side. As a result, the thickness of the inclined pipe portion 32 arranged between the second inner surface 32b and the first outer surface 32d in the radial direction is reduced, and sink marks or the like occur in this portion formed by injection molding, resulting in molding defects. It can be suppressed from becoming.
The inner peripheral surface of the inclined pipe portion 32 includes a third inner surface 32c. Therefore, the first inner surface 32a and the second inner surface 32b of the inclined pipe portion 32 can be connected by the third inner surface 32c.

The surfaces 34a and 34b of the third swivel blade 34 gradually extend toward the first side X1 from the upper side to the lower side. Therefore, the thickness of the third swivel blade 34 can be reduced to prevent sink marks and the like from being generated in this portion formed by injection molding, resulting in molding defects. Further, the space below the third swivel blade 34 in the inclined pipe portion 32 can be secured widely, and the drainage performance of the collective joint 11 can be further improved.

Although one embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and the configuration is changed, combined, or deleted without departing from the gist of the present invention. Etc. are also included.
For example, in the above embodiment, the outer peripheral surface of the inclined pipe portion 32 arranged on the radial outer side of the second inner surface 32b may have a flat shape along the axis O.
Further, the surface 34a or the surface 34b of the third swivel blade 34 may be a curved surface curved upward or downward instead of a flat surface. 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 on the outer side in the radial direction of the second inner surface 32b extend in the circumferential direction X and are arranged at intervals in the vertical direction from each other. However, the protrusion 36 may extend in the vertical direction (pipe axis direction), and both the protrusion 36 extending in the circumferential direction X and the protrusion 36 extending in the vertical direction may be provided.

The connecting pipe portion 31 and the lower pipe portion 33 are used as receiving ports, but may be outlets.
When the connecting pipe portion 31 is a spigot, the intermediate pipe 18 can be omitted as described above, and the connecting pipe portion 31 can be inserted into the lower end (receptacle) of the upper connecting pipe 17.
When the lower pipe portion 33 is a spigot, it can be configured like the lower connecting pipe 19A according to another embodiment shown in FIGS. 9 and 10. In the lower connecting pipe 19A, the lower pipe portion 33 is inserted into the receiving port 46a with the upper end of the vertical pipe 46A located below the collective joint 11 as the receiving port 46a. In the illustrated example, the diameter (outer diameter, inner diameter) of the lower pipe portion 33 is equivalent to the diameter of the lower end of the inclined pipe portion 32.

As shown in FIG. 10, when the upper end of the vertical pipe 46A is the receiving port 46a, a rubber ring 46b that enhances water stopping can be provided in the receiving port 46a. In the illustrated example, the inner diameter of the receiving port 46a is larger than the outer diameter of the lower pipe portion 33. The rubber ring 46b is fitted to the receiving port 46a from the inside and is fitted to the lower pipe portion 33 from the outside. In other words, the rubber ring 46b is sandwiched between the receiving port 46a and the lower pipe portion 33. As a result, the water-stopping property of the rubber ring 46b is exhibited.

By the way, in the lower connecting pipe 19A, for example, the rubber ring 46b is not the outer peripheral surface of the lower pipe portion 33 but the inclined pipe portion due to the unexpected movement of the vertical pipe 46A and the lower connecting pipe 19. There is a possibility that it will fit on the outer peripheral surface of 32. This kind of unexpected movement is caused by, for example, the vertical pipe 46A thermally expanding and contracting and moving, or the operator making a mistake in construction.
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 located at the height position of the recess 32e by the third swivel blade 34 in the lower connecting pipe 19. .. In this case, a gap is formed between the rubber ring 46b and the lower pipe portion 33, and the water blocking property of the rubber ring 46b is impaired.
Therefore, a means for regulating the relative movement of the vertical pipe 46A and the lower connecting pipe 19 (hereinafter referred to as a regulating means 60) is provided. As a result, the overlap between the rubber ring 46b and the recess 32e is restricted, and the water stoppage by the rubber ring 46b is ensured.

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

The regulatory means 60A shown in FIG. 11 is provided on the lower connecting pipe 19B. The regulating means 60A is provided at a connecting portion between the inclined pipe portion 32 and the lower pipe portion 33 in the lower connecting pipe 19B. In other words, the regulating means 60A is located below the height of the recess 32e. The regulating means 60A is a protrusion protruding outward in the radial direction. In the illustrated example, the regulating means 60A is provided over the entire circumference of the circumferential direction X. In this case, when the unexpected movement as described above is about to occur, the upper end of the vertical pipe 46A comes into contact with the lower surface of the regulating means 60A, and further movement is restricted.

The regulatory means 60C shown in FIG. 12 is provided on the vertical pipe 46B. The regulating means 60C is provided at the upper end of the vertical pipe 46B. The regulating means 60C is a protrusion protruding inward in the radial direction. In the illustrated example, the regulating means 60C is provided over the entire circumference of the circumferential direction X. The inner diameter of the regulating means 60C is equivalent to the outer diameter of the lower pipe portion 33. In this case, when the unexpected movement as described above is about to occur, the regulating means 60C comes into contact with the lower end of the inclined pipe portion 32, and further movement is restricted.

The regulatory means 60D shown in FIG. 13 is provided on the vertical pipe 46C. In this modified example, the shape of the receiving port 46a is different from the other modified examples. That is, the inner diameter of the receiving port 46a in this modification is equivalent to the outer diameter of the lower pipe portion 33. An annular recess 46c extending in the circumferential direction X is provided on the inner peripheral surface of the receiving port 46a. The rubber ring 46b is fitted in the recess 46c. The regulating means 60D is formed by the upper end of the vertical pipe 46C. In this case, when the unexpected movement as described above is about to occur, the regulating means 60D (upper end of the vertical pipe 46C) comes into contact with the lower end of the inclined pipe portion 32, and further, as in the modified example shown in FIG. Movement is regulated.

The regulatory means 60E shown in FIG. 14 is provided on the rubber ring 46b. The regulating means 60E is provided at the lower end of the rubber ring 46b. The regulating means 60E is a protrusion protruding inward in the radial direction. In the illustrated example, the regulating means 60E is provided over the entire circumference of the circumferential direction X. The inner diameter of the regulating means 60E is equal to or less than the outer diameter of the lower pipe portion 33. In this case, when the unexpected movement as described above is about to occur, the regulating means 60E comes into contact with the lower end of the lower pipe portion 33, and further movement is restricted. In this case, the distance L1 from the regulating means 60E to the lower end of the lower pipe portion 33 is preferably shorter than the distance L0 from the upper end of the vertical pipe 46A to the recess 32e (L1 <L0). Further, the regulating means 60E may be formed by a step portion 46d provided at the base end of the receiving port 46a, or may be provided as a protrusion inside the receiving port 46a. In these cases, the inner diameter of the receiving port 46a may be the same as the outer diameter of the lower pipe portion 33, as in the vertical pipe 46C shown in FIG.

The collective joint 11 does not have to include the vertical pipe connecting portion 23 and the horizontal pipe connecting portion 41.
The position where the swivel blade is 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 body 16 is formed in a circular tubular shape. However, the shape of the joint body is not limited to this, and the joint body may be formed in an elliptical tubular shape, a square tubular shape, or the like.

11 Collective joint 16 Joint body 32 Inclined pipe part 32a 1st inner surface 32b 2nd inner surface 32c 3rd inner surface 32d 1st outer surface (at least a part of the outer peripheral surface of the inclined pipe part)
34 Third swivel blade (swivel vane)
O-axis line X Circumferential direction X1 1st side X2 2nd side

Claims (6)

An upper connecting pipe with a horizontal pipe connecting part on the outer peripheral surface,
A lower connecting pipe that is formed in a tubular shape and has an axis aligned in the vertical direction.
Equipped with
The lower connecting pipe has a socket into which the lower end of the upper connecting pipe is inserted, a swivel blade provided integrally with the inner surface of the lower connecting pipe by injection molding, and an inclination that gradually reduces in diameter from the upper side to the lower side. Has a tube and
The swivel blade gradually extends toward the first side in the circumferential direction from above to downward, and has an upper surface facing the first side and a lower surface facing the second side in the circumferential direction.
At least a part of the swivel blade is provided on the inner peripheral surface of the inclined pipe portion, and is provided.
The inner peripheral surface of the inclined pipe portion is
The first inner surface, which is gradually inclined toward the axis from the upper side to the lower side,
A second inner surface arranged in a lower portion of the lower surface of the swirl vane, and
It has a third inner surface that extends radially outward from the second side end of the second inner surface and faces the second side.
Of the outer peripheral surface of the inclined pipe portion, the outer peripheral surface of the portion corresponding to the second inner surface is recessed.
The third inner surface is a collective joint that is parallel to the axis or is inclined toward the second side as it goes downward. The first aspect of claim 1, wherein at least a part of the outer peripheral surface of the inclined pipe portion arranged on the radial outer side of the second inner surface is gradually inclined so as to be separated from the axis line from the upper side to the lower side. Collective joint. A dent is provided on the outer peripheral surface of the inclined pipe portion.
A sound insulation cover is provided on the outer peripheral surface of the inclined pipe portion.
The sound insulation cover is supported by the material filled in the recess.
The collective joint according to claim 1 or 2. A dent is provided on the outer peripheral surface of the inclined pipe portion.
The collective joint according to any one of claims 1 to 3, wherein the recess is surrounded by the upper surface of the swivel blade, the second inner surface, and the third inner surface. A lower pipe portion is provided at the lower part of the inclined pipe portion, and the lower pipe portion is provided.
The lower pipe portion is used as a spout, and the lower pipe portion is used as a spigot.
A protrusion protruding outward in the radial direction is provided between the inclined pipe portion and the lower pipe portion.
The collective joint according to any one of claims 1 to 4. A lower pipe portion is provided at the lower part of the inclined pipe portion, and the lower pipe portion is provided.
The lower pipe portion is a spigot that is located below the collective joint and is connected to a vertical pipe having a socket at the upper end.
The length of the outlet is longer than the length from the regulating means provided inside the socket of the vertical pipe to the end of the socket.
The collective joint according to any one of claims 1 to 5.

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