JP7474038B2 - Group Joint System - Google Patents

Description

The present invention relates to a joint assembly system.

Conventionally, buildings such as apartment buildings and office buildings are equipped with a collective joint system for drainage channels, etc. (see, for example, Patent Documents 1 and 2). For example, the collective joint system includes horizontal pipes that collect wastewater on each floor of the building, vertical pipes that direct the wastewater collected in each horizontal pipe downward, and a collective joint that connects the horizontal pipes and the vertical pipes.

The collective joint includes a joint body formed in a tubular shape, a horizontal pipe connection portion provided on the outer circumferential surface of the joint body, and a swirl vane provided on the inner circumferential surface of the joint body.
The joint body is arranged so that its axis is along the vertical direction. The vertical pipes are connected to the upper and lower ends of the joint body. The horizontal pipe is connected to the horizontal pipe connection portion. The swirl vanes are arranged in a spiral shape that gradually extends circumferentially from top to bottom in a portion of the joint body below the horizontal pipe connection portion.

The wastewater that flows into the joint body from the vertical pipes and horizontal pipes connected to the upper end of the joint body hits the upper surface of the swirl vane and flows in a spiral along the upper surface of the swirl vane. While the wastewater flows down in a spiral inside the joint body of the collective joint, the air inside the joint body flows through the space where the wastewater does not flow.
In this way, the collective joint system can improve drainage performance, which is the flow rate of drainage water flowing inside while suppressing the pressure difference generated inside.

JP 2000-096646 A JP 2001-173866 A

There is also a desire to improve sound insulation in collective joint systems.
However, there is room for improvement in the drainage performance and sound insulation of the joint assembly system.

The present invention was made in consideration of these problems, and aims to provide a joint assembly system with improved drainage performance and sound insulation.

In order to solve the above problems, the present invention proposes the following means.
The collective joint system of the present invention comprises a collective joint and a vertical pipe connected to the collective joint, the collective joint comprising a tubular joint body arranged such that its axis is along a vertical direction, and a swirl vane provided on an inner peripheral surface of the joint body, the swirl vane gradually extending toward a first side in the circumferential direction as it goes from above to below, and a connection portion between the swirl vane and the joint body and a side opposite to the connection portion in the swirl vane in a cross-sectional view perpendicular to the axis of the swirl vane and when a line including the end of the swirl vane is used as a reference line, when viewed downward in the cross section, the ratio of the area of the internal space of the joint body that is on the opposite side of the reference line to the first tip of the swirl vane to the area of the internal space of the joint body is 30% or more regardless of the position in the axial direction of the cross section, and when viewed in a plan view, the ratio of the area of the swirl vane in the internal space of the vertical tube to the area of the internal space of the vertical tube is 5% or more and 30% or less.

According to this invention, wastewater that flows into the joint body and hits the surface of the swirl vane facing the first circumferential side gradually flows spirally toward the first circumferential side as it moves from top to bottom along the swirl vane.
Hereinafter, the area of the internal space of the joint body on the opposite side of the tip of the first side of the swirl vane from the reference line when viewed downward in cross section will be referred to as the ventilation contributing area. The inventors of the present invention have found that as the ratio of the ventilation contributing area to the area of the internal space of the joint body (hereinafter referred to as the ventilation contributing area ratio) increases, air flows more easily inside the joint body, making ventilation easier, and improving the drainage performance of the collective joint system.
By making the ventilation contributing area ratio 30% or more regardless of the axial position of the cross section, it becomes easier to achieve a certain level of ventilation, thereby improving the drainage performance of the collective joint system.
Furthermore, if the ratio of the area of the swirl vanes in the internal space to the area of the internal space of the vertical pipe (hereinafter referred to as the blade area ratio) is less than 5%, the wastewater is less likely to hit the surface of the swirl vanes facing the first side in the circumferential direction. On the other hand, if the blade area ratio exceeds 30%, the sound generated when the wastewater hits the surface of the swirl vanes facing the first side in the circumferential direction becomes louder, and the force that the swirl vanes receive when the wastewater hits them becomes larger. By setting the blade area ratio to be 5% or more and 30% or less, it is possible to improve sound insulation, make it easier for the wastewater to flow in a spiral, and reduce the force that the swirl vanes receive from the wastewater.

In the above-described collective joint system, an angle at which the swirl vane is inclined toward the first side with respect to the reference line in the cross-sectional view may be greater than or equal to 5° and less than or equal to 30°.
According to this invention, if the angle is less than 5°, the effect of flowing the wastewater along the inner peripheral surface of the joint body is reduced. On the other hand, if the angle exceeds 30°, the area of the surface of the swirl vane facing the first side in the circumferential direction in a plan view is reduced. As a result, the flow path through which the wastewater flows on the surface facing the first side in the circumferential direction of the swirl vane is narrowed, and the flow rate of the wastewater flowing over the swirl vane is reduced.
By setting this angle to be between 5° and 30°, the amount of wastewater flowing over the swirl vanes can be ensured and the wastewater can be made to flow in a spiral shape more reliably.

In addition, in the above-mentioned collective joint system, when the inner surface of the joint body is viewed from the radially inside so that the connection portion between the inner surface and the upper end portion of the swirl vane is located at the front, the angle that the swirl vane makes with the vertical direction may be greater than or equal to 10° and less than 45°.
According to this invention, if the angle is less than 10°, the wastewater is less likely to flow in a spiral even when it hits the surface of the swirl vane facing the first side in the circumferential direction. On the other hand, if the angle exceeds 45°, the flow of the wastewater becomes turbulent, the sound generated when the wastewater hits the surface of the swirl vane facing the first side in the circumferential direction becomes louder, and the force that the swirl vane receives when the wastewater hits becomes large. By setting the angle to be between 10° and 45°, the sound generated from the swirl vane can be suppressed, while the wastewater can be made to flow more easily in a spiral and the force that the swirl vane receives from the wastewater can be suppressed.

The joint system of the present invention can improve drainage performance and sound insulation.

FIG. 1 is a side view, with a portion cut away, of a collective joint system according to a first embodiment of the present invention. FIG. 4 is a vertical cross-sectional view of a lower connecting pipe of the same joint. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 2. 3 is a cross-sectional view taken along line VV in FIG. 2. 6 is a cross-sectional view taken along line VI-VI in FIG. 2. 3 is a cross-sectional view taken along line VII-VII in FIG. 2. 6 is a cross-sectional view taken along line VI-VI in FIG. 2, showing a case where the positions of the connection portions and ends are different from those in the cross-sectional view shown in FIG.

First Embodiment
Hereinafter, a first embodiment of a group joint system according to the present invention will be described with reference to Figs. 1 to 7 .
As shown in Fig. 1, the collective joint system 1 of this embodiment is used for drainage of a building 101. The collective joint system 1 is arranged on each floor through a slab penetration hole 102a formed in a floor slab 102 of the building 101.

The collective joint system 1 comprises the collective joint 11 of this embodiment, a vertical pipe 46, and a horizontal pipe 48.
The joint assembly 11 includes a joint body 16 and a horizontal pipe connection portion 41. The joint body 16 is formed in a cylindrical shape and is disposed so that an axis O is aligned in the vertical direction. Hereinafter, the circumferential direction X of the joint body 16 (see FIG. 3 ) will be 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 circumferential surface of the upper connecting pipe 17. In the present embodiment, a plurality of horizontal pipe connecting portions 41 are provided on the outer circumferential surface of the upper connecting pipe 17. A horizontal pipe 48 is connected to the horizontal pipe connecting portion 41.
A plurality of damming plates 22 are fixed to the inner peripheral surface of the upper connecting pipe 17. The damming plates 22 prevent wastewater from flowing back into the horizontal pipe 48.
The upper connecting pipe 17 is made of polyvinyl chloride resin or the like.

A vertical pipe connection part 23 is attached to the upper end part of the upper connecting pipe 17. The vertical pipe connection part 23 is provided with a first swirl vane 24. The first swirl vane 24 is disposed at a position corresponding to the horizontal pipe 48 in the up-down direction.
The wastewater that hits the upper surface of the first swirl vane 24 hits the upper surface of the third swirl vane 34, which will be described later, and the wastewater continuously swirls from the first swirl vane 24 to the third swirl vane 34. At this time, for example, an air core is formed on the axis O, which makes it easier to ventilate in the vertical direction. Therefore, the positions of the first swirl vane 24 and the third swirl vane 34 are relatively arranged in consideration of the vertical distance between the first swirl vane 24 and the third swirl vane 34 and the angle of the first swirl vane 24 so that the wastewater from the first swirl vane 24 hits the third swirl vane 34 (so that the wastewater swirls). Note that in the case where the dam plate 22 is provided inside the upper connecting pipe 17 as in this embodiment, and the first swirl vane 24 cannot be freely arranged inside the upper connecting pipe 17, the relative positions of the first swirl vane 24 and the third swirl vane 34 can be adjusted, for example, by the methods shown in (1) and (2) below. (1) When the upper connecting pipe 17 and the lower connecting pipe 19 are assembled, the lower connecting pipe 19 having the third swirl vane 34 is rotated relative to the upper connecting pipe 17. (2) The length of the intermediate pipe 18 is adjusted in advance.
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.

For example, Eslon (registered trademark) fire-resistant VP pipe (manufactured by Sekisui Chemical Co., Ltd.) can be suitably used for the intermediate pipe 18. Eslon fire-resistant VP pipe thermally expands to seal the space inside the pipe in the event of a fire, preventing the fire from spreading. Alternatively, the intermediate pipe 18 may be made of a normal resin such as polyvinyl chloride resin, and a thermal expansion sheet may be wrapped around the outer circumferential surface of the intermediate pipe 18.
A second swirl vane (not shown) may or may not 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. The connection portion between the upper connecting pipe 17 and the intermediate pipe 18 is joined by, for example, an adhesive or the like.
1, the connection portion between the upper connecting pipe 17 and the intermediate pipe 18 is disposed in a slab penetration hole 102a of a floor slab 102. Mortar 103 is filled in the slab penetration hole 102a.

As shown in FIGS. 2 and 3 , the lower connecting pipe 19 includes a connecting pipe section 31 , an inclined pipe section 32 , a lower pipe section (vertical pipe connecting section) 33 , and a third swirl vane (swirl vane) 34 .
As shown in Figure 3, Figure 2 is a view of the inner surface of the inclined pipe section 32 viewed in the direction of arrow B1 from the radially inside, with the connection portion 32a on the inner surface with the upper end portion of the third swirl vane 34 located at the front.

The connecting pipe portion 31 is formed in a cylindrical shape and is fitted onto 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 or the like.
The inclined pipe portion 32 is formed in a cylindrical shape, and is formed so that the outer diameter and the inner diameter are gradually reduced from the top to the bottom. In other words, the inclined pipe portion 32 is tapered.
The inclined pipe section 32 is disposed coaxially with the connecting pipe section 31. The upper end section of the inclined pipe section 32 is fixed to the inner circumferential surface of the lower end section of the connecting pipe section 31. The upper end section of the inclined pipe section 32 contacts the lower end section of the intermediate pipe 18 from below the intermediate pipe 18 (see FIG. 1 ).

The lower pipe portion 33 is formed in a cylindrical shape. The lower pipe portion 33 is disposed coaxially with the inclined pipe portion 32. The upper end portion of the lower pipe portion 33 is fixed to the outer circumferential surface of the lower end portion of the inclined pipe portion 32. A vertical pipe 46 is connected to the lower pipe portion 33.
In this manner, the vertical pipes 46 are connected to the upper and lower ends of the joint body 16. The two vertical pipes 46 are arranged coaxially.

The third swirl vane 34 is fixed to a portion of the inner circumferential surface of the inclined pipe section 32 below the horizontal pipe connection portion 41 (see FIG. 1). As shown in FIG. 3, the third swirl vane 34 gradually extends from above toward the first side X1 in the circumferential direction X as it goes from above toward the downward direction. The aforementioned connection portion 32a may be a connection portion (intersection) with an upper end portion of a surface 34a of the third swirl vane 34 on the inner circumferential surface of the inclined pipe section 32, the surface 34a facing the first side X1 in the circumferential direction X.
As shown in FIG. 2, an angle θ1 that the third swirl vane 34 makes below the connection portion 32a with respect to the axis O (vertical direction) is equal to or greater than 10° and equal to or less than 45°.
In Fig. 3, the inner peripheral surface 46a of the vertical tube 46 is indicated by a two-dot chain line. In this case, the internal space R1 of the vertical tube 46 is the region inside the inner peripheral surface 46a. The area S1 of the third swirl vane 34 in the internal space R1 is the area shown by hatching in Fig. 3. The ratio of the area S1 to the area of the internal space R1 (hereinafter referred to as the vane area ratio) is 5% or more and 30% or less.

Here, the cross-sectional shape of the third swirl vane 34 perpendicular to the axis O will be described. Fig. 4 is a cross-sectional view taken along the line IV-IV in Fig. 2. Similarly, Figs. 5, 6, and 7 are cross-sectional views taken along the lines VV, VI-VI, and VII-VII in Fig. 2, respectively. Fig. 6 is a cross-sectional view passing through the center of the third swirl vane 34 in the up-down direction.
Hereinafter, the cross-sectional view of Fig. 6 will be referred to as a center cross-sectional view. Fig. 4 is a cross-sectional view at the upper end of the third swirl vane 34, and will be referred to as an upper end cross-sectional view below. Fig. 5 is a cross-sectional view of a cross section disposed between the cross section used in Fig. 6 and the cross section used in Fig. 4, and will be referred to as an upper/middle cross-sectional view below. Fig. 7 is a cross-sectional view at the lower end of the third swirl vane 34, and will be referred to as a lower end cross-sectional view below.

As shown in FIG. 6, a connection portion 32b between the third swirl vane 34 and the inclined pipe portion 32 of the joint body 16 is defined. The connection portion 32b may be a connection portion (intersection) between the upper surface of the third swirl vane 34 and the inclined pipe portion 32. In other words, the connection portion 32b may be a connection portion between the upper surface of the third swirl vane 34 in each cross section, i.e., a cut surface of the third swirl vane 34 and the inclined pipe portion 32, as shown in FIG. 6. In this case, the center in the circumferential direction of the cut surface (upper surface) can be used as the connection portion. The third swirl vane 34 is inclined at an angle θ2 to the first side X1 with respect to a reference line L connecting the connection portion 32b and the axis O. Here, the inclination angle of the third swirl vane 34 with respect to the reference line L can be defined by the angle between the reference line L and the second reference line L2 (reference line) in each cross section, as shown in FIG. 6. The second reference line L2 is a straight line (line) including a connection portion 32b between the third swirl vane 34 and the joint body 16 and an end 34c of the third swirl vane 34 opposite the connection portion 32b, in a cross section perpendicular to the axis O of the third swirl vane 34. Note that, as shown in Fig. 6, if the end 34c of the third swirl vane 34 has a thickness, the second reference line L2 can be a straight line passing through the center of the end 34c in the thickness direction.
The angle θ2 is greater than 0° and less than 90°. In other words, in the third swirl vane 34, the surface 34a facing the first side X1 in the circumferential direction X is closer to the inner surface of the inclined pipe portion 32 than the surface 34b facing the second side X2 in the circumferential direction X. It is more preferable that the angle θ2 with respect to the reference line L is greater than or equal to 5° and less than or equal to 30°.

In this example, in the upper end cross-sectional view shown in Fig. 4, the third swirl vane 34 and the reference line L are substantially parallel to each other. In the upper-middle cross-sectional view shown in Fig. 5, the third swirl vane 34 is inclined at an angle θ3 toward the first side X1 with respect to the reference line L. The angle θ3 is smaller than the angle θ2.
7, the third swirl vane 34 is inclined at an angle θ4 toward the first side X1 with respect to the reference line L. The angle θ4 is greater than the angle θ2.
That is, as the cross section of the third swirl vane 34 goes from top to bottom, the angle at which the third swirl vane 34 is inclined toward the first side X1 with respect to the reference line L becomes larger, and is greater than 0° and less than 90°. The angle at which the third swirl vane 34 is inclined toward the first side X1 with respect to the reference line L connecting the connection portion 32b and the axis O is a negative value at the upper end of the third swirl vane 34. That is, at the upper end of the third swirl vane 34, the third swirl vane 34 is inclined toward the second side X2 (the side opposite to the first side X1) in the circumferential direction X. Here, in order to set the minimum value of the ventilation contributing area ratio described later to 30% or more, the angle at the upper end of the third swirl vane 34 is -20° or more and 0° or less.

In other words, the angle between the tangent to the inscribed circle of the inclined pipe section 32 at the connection portion 32b and the third swirl vane 34 is 0° or more and 110° or less, and the angle is inclined so as to decrease as the cross section cutting the third swirl vane 34 moves from top to bottom. In this embodiment, the angle between the tangent to the inscribed circle of the inclined pipe section 32 at the connection portion 32b and the third swirl vane 34 (second reference line L2) is 95° in Fig. 4, 87° (θ3 = 3°) in Fig. 5, 78° (θ2 = 12°) in Fig. 6, and 66° (θ4 = 24°) in Fig. 7. Note that, for each of these angles, the part of the tangent located on the first side X1 with respect to the third swirl vane 34 is set as the origin (reference), and the direction from the origin toward the third swirl vane 34 (second reference line L2) is set as the positive direction.
In this way, by setting the angle between the tangent to the inscribed circle of the inclined pipe section 32 at the connection portion 32b and the third swirl vane 34 to be between 0° and 110°, the minimum value of the ventilation contributing area ratio described below can be set to 30% or more. When the angle is 100° or less, the minimum value of the ventilation contributing area ratio is 40% or more, and when the angle is 90° or less, the minimum value of the ventilation contributing area ratio is 50% or more. By reducing the angle, the minimum value of the ventilation contributing area ratio can be increased, making it easier to ventilate in the vertical direction.
In addition, the wastewater flowing down from the first swirl vane 24 is directed in a direction along the inner surface of the inclined pipe section 32, and the wastewater escapes to the center of the inclined pipe section 32, which serves as the ventilation section, thereby preventing the ventilation in the vertical direction from being obstructed.
Furthermore, the ratio of the area S1 of the third swirl vane 34 to the area of the internal space R1 of the vertical pipe can be set to 30% or less without reducing the area of the surface 34a, which is the water receiving surface of the third swirl vane 34.

In each of the cross-sectional views of Figures 4 to 7, the surface 34a of the third swirl vane 34 and the surface 34b facing the second side X2 in the circumferential direction X are both flat. In this example, the surfaces 34a and 34b of the third swirl vane 34 are both flat.

The connecting pipe section 31, the inclined pipe section 32, the lower pipe section 33, and the third swirl vane 34 that constitute the lower connecting pipe 19 are integrally formed by injection molding of, for example, polyvinyl chloride resin.
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 may be integrally composed of a single member.

A sound-insulating cover may be provided on the outer periphery of the joint body 16 as a sound-insulating measure. The sound-insulating cover is formed, for example, of a sheet made of soft polyvinyl chloride, butyl rubber, or polypropylene (PP) resin with a thickness of 0.8 to 2 mm. The sound-insulating cover may also be a laminate in which a layer of polyester fiber, urethane foam, or glass wool with a thickness of 5 to 20 mm is provided on the inside of the above-mentioned sheet.

Also, the intermediate tube 18 may be omitted.
In this 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 made into 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 made into a spigot and the lower connecting pipe 19 is inserted into this lower end.
In these cases, a sheet-like fireproof material (hereinafter also referred to as a fireproof sheet) can be wrapped around the connection portion between the upper connecting pipe 17 and the lower connecting pipe 19. In this case, the fireproof sheet is wrapped around the portion of the upper connecting pipe 17 or the lower connecting pipe 19 that is located below the horizontal pipe connection portion 41. When wrapping the fireproof sheet around the lower connecting pipe 19, if the outer surface of the lower connecting pipe 19 in the area where the third swirl vane 34 is present is recessed toward the inside in the radial direction, for example, from the viewpoint of formability, it is difficult to wrap the fireproof sheet around this area. In this case, it is preferable to wrap the fireproof sheet around the area of the lower connecting pipe 19 where the third swirl vane 34 is not present. On the other hand, if a protrusion protruding toward the outside in the radial direction is provided within this recess, the fireproof sheet can be supported from the inside in the radial direction by the protrusion. Therefore, the fireproof sheet may be wrapped around the lower connecting pipe 19 up to the position where the third swirl vane 34 is present.

As described above, according to the collective joint 11 of this embodiment, the wastewater that flows into the joint body 16 and hits the surface 34a of the third swirl vane 34 gradually flows spirally toward the first side X1 in the circumferential direction X as it moves from top to bottom along the third swirl vane 34. At this time, in the central cross-sectional view shown in FIG. 6, the third swirl vane 34 is inclined toward the first side X1 with respect to the reference line L. For this reason, for example, compared to when the third swirl vane 34 extends along the reference line L, the wastewater is more likely to flow spirally along the inner surface of the joint body 16. Therefore, even if the flow rate of the wastewater increases, the air in the joint body 16 is more likely to flow upward, and the drainage performance of the collective joint 11 can be improved.

The angle θ2 at which the third swirl vane 34 is inclined toward the first side X1 with respect to the reference line L is equal to or greater than 5° and equal to or less than 30°. If the angle θ2 is less than 5°, the effect of causing the wastewater to flow along the inner circumferential surface of the joint body 16 is reduced. On the other hand, if the angle θ2 exceeds 30°, the area of the upper surface of the third swirl vane 34 in plan view is reduced. As a result, the flow path through which the wastewater flows on the upper surface of the third swirl vane 34 is narrowed, and the flow rate of the wastewater flowing over the third swirl vane 34 is reduced.
By setting the angle θ2 to be between 5° and 30°, the flow rate of the wastewater flowing over the third swirl vane 34 can be ensured, while the wastewater can be made to flow in a spiral shape more reliably.

The angle θ1 between the connection part 32a and the axis O is 10° or more and 45° or less, preferably 10° or more and 40° or less, and more preferably 10° or more and 30° or less. If the angle θ1 is less than 10°, the wastewater is less likely to flow in a spiral even when it hits the surface 34a of the third swirl vane 34. On the other hand, if the angle θ1 exceeds 45°, the flow of the wastewater becomes turbulent, the sound generated when the wastewater hits the surface 34a of the third swirl vane 34 becomes louder, and the force that the third swirl vane 34 receives when the wastewater hits it becomes large. By setting the angle θ1 to 10° or more and 45° or less, the sound generated from the third swirl vane 34 can be suppressed, while the wastewater can be made to flow in a spiral and the force that the third swirl vane 34 receives from the wastewater can be suppressed.

Furthermore, according to the collective joint system 1 of this embodiment, the collective joint system 1 can be configured using the collective joint 11 with improved drainage performance.
The blade area ratio (the ratio of the area S1 of the third swirl blade 34 in the internal space R1 to the area of the internal space R1) is 5% or more and 30% or less, and preferably 10% or more and 25% or less.
If the blade area ratio is less than 5%, it becomes difficult for the wastewater to strike the surface 34a of the third swirl vane 34. On the other hand, if the blade area ratio exceeds 30%, the sound generated when the wastewater strikes the surface 34a of the third swirl vane 34 becomes louder, and the force that the swirl vane receives when the wastewater strikes becomes greater. By setting the blade area ratio to be 5% or more and 30% or less, it is possible to improve sound insulation, make it easier for the wastewater to flow in a spiral, and reduce the force that the third swirl vane 34 receives from the wastewater.

In the collective joint 11 of this embodiment, the angle θ2 at which the third swirl vane 34 is inclined toward the first side X1 with respect to the reference line L may be less than 5° or more than 30°.
The angle θ1 that the third swirl vane 34 makes with respect to the axis O may be less than 10° or greater than 45°.

Second Embodiment
Next, a second embodiment of the present invention will be described with reference to FIGS. 4 to 7. The same components as those in the above embodiment are designated by the same reference numerals, and the description thereof will be omitted. Only the differences will be described.
In this embodiment, the same collective joint system 1 as in the first embodiment will be described with focus on a different viewpoint from that of the first embodiment.

Here, the ventilation contributing area and the drainage contributing area will be described with reference to FIG.
First, the second reference line (reference line) L2 is defined.
In this case, the ventilation contributing area is the area of a region R6, which is the internal space of the joint body 16 when viewed downward in cross section, on the opposite side of the tip of the first side X1 of the third swirl vane 34 from the second reference line L2. Note that in Figures 4 to 7, the region R6 is shown with hatching.
The drainage contributing area is the area of the internal space of the fitting body 16 when viewed downward in cross section, which is the area of region R7 on the tip side of the first side X1 of the third swirl vane 34 relative to the second reference line L2.

The ventilation contributing area ratio is the ratio of the area of the region R6 to the area of the internal space of the fitting body 16 when viewed downward in a cross-sectional view. The drainage contributing area ratio is the ratio of the area of the region R7 to the area of the internal space of the fitting body 16 when viewed downward in a cross-sectional view.
The inventors of the present invention have found that as the ventilation contributing area ratio increases, air flows more easily inside the joint body 16, making ventilation easier, and improving the drainage performance of the collective joint 11. Furthermore, they have found that the minimum value of the ventilation contributing area ratio depending on the position in the axial line O direction of the cross section governs the drainage performance of the collective joint 11.
In addition, the drainage contributing area ratio contributes to the rotation of the drainage water, and as the drainage contributing area ratio increases, the drainage water becomes easier to rotate within the joint body 16.

5 to 7, the area of region R6 corresponding to the ventilation contributing area and the area of region R7 corresponding to the drainage contributing area are shown.
In the collective joint 11 of the present embodiment, the ventilation contributing area ratio is 30% or more regardless of the position of the cross section in the direction of the axis O. In other words, the minimum value of the ventilation contributing area ratio of the collective joint 11 is 30% or more.
Furthermore, the blade area ratio is 5% or more and 30% or less.

As described above, according to the collective joint 11 of this embodiment, by setting the ventilation contributing area ratio to 30% or more regardless of the position in the axial O direction of the cross section, it becomes easier to achieve a certain level of ventilation, thereby improving the drainage performance of the collective joint 11.
Furthermore, by having a blade area ratio of 5% or more and 30% or less, sound insulation is improved, wastewater is made to flow more easily in a spiral manner, and the force that the third swirl blade 34 receives from the wastewater is reduced.

In the above embodiment, the connection portion 32b between the third swirl vane 34 and the inclined pipe portion 32 of the joint body 16 is the connection portion between the cut surface of the third swirl vane 34 and the inclined pipe portion 32. However, instead of this, as shown in FIG. 8, the connection portion 32b may be the connection portion between the surface 34a of the third swirl vane 34 (the surface of the third swirl vane 34 facing upward) and the inclined pipe portion 32. In this case, if the end 34c of the third swirl vane 34 has a thickness, the second reference line L2 can be a straight line passing through the part of the end 34c that forms the surface 34a. If the cut surface 34a is a straight line rather than a curve in the cross section, the second reference line L2 is a straight line extending along the cut surface 34a.
Even in this case, the third swirl vane 34 (the surface 34a of the third swirl vane 34) is inclined toward the first side X1 at an angle θ2' with respect to the reference line L connecting the connecting portion 32b and the axis O. This angle θ2' is preferably 5° or more and 30° or less.

(Example)
EXAMPLES Hereinafter, the present invention will be described in more detail by specifically showing examples (and comparative examples); however, the present invention is not limited to the following examples.
Group joint systems with conditions No. 1 to No. 6 shown in Table 1 were prepared as samples.

In the group joint system No. 1, the minimum ventilation contributing area ratio is 52%. In the group joint systems No. 2 to No. 6, the minimum ventilation contributing area ratios are 38%, 60%, 25%, 45%, and 35%, respectively.
In the group joint system No. 1, the blade area ratio is 16%. In the group joint systems No. 2 to No. 6, the blade area ratios are 8%, 23%, 16%, 4%, and 32%, respectively.

The drainage performance and sound insulation of the group joint systems under conditions No. 1 to No. 6 were evaluated.
The drainage performance was evaluated based on the provisions of SHASE (The Society of Heating, Air-Conditioning and Sanitary Engineers of Japan)-S218 (2014), Drainage Capacity Test Method for Drainage Stack Systems in Apartment Buildings.
The sound insulation was evaluated by piping a collective joint system in a soundproof room, and measuring the sound level with a sound level meter from a position 50 cm away from the collective joint system while drainage water was flowing through the collective joint system at 4 L/s (liters per second).

The measurement results of sound insulation and drainage performance are shown in Table 1.
In the group joint system No. 1, the drainage performance was 7.0 L/s. In the group joint systems No. 2 to No. 6, the drainage performance was 6.5 L/s, 7.0 L/s, 4.5 L/s, 4.0 L/s, and 4.0 L/s, respectively.
In the group joint system No. 1, the sound insulation was 47 dB. In the group joint systems No. 2 to No. 6, the sound insulation was 45 dB, 49 dB, 51 dB, 48 dB, and 52 dB, respectively.

The standard for passing the drainage performance is 6.0 L/s or more. The standard for passing the sound insulation is 50 dB or less. If the drainage performance and the sound insulation are both passing, the overall evaluation is passing and the product is classified as an example. If at least one of the drainage performance and the sound insulation is not passing, the overall evaluation is not passing and the product is classified as a comparative example.
The group joint systems Nos. 1 to 3 were examples, and the group joint systems Nos. 4 to 6 were comparative examples.

Although the first and second embodiments of the present invention have been described above in detail with reference to the drawings, the specific configurations are not limited to these embodiments, and the present invention also includes modifications, combinations, deletions, etc. of the configurations within the scope of the gist of the present invention. Furthermore, it goes without saying that the configurations shown in each embodiment can be used in appropriate combinations.
For example, in the first and second embodiments, the joint assembly 11 does not need to include the vertical pipe connecting portion 23 and the horizontal pipe connecting portion 41 .
The position at which the swirl vane is provided within the joint body 16 is not particularly limited, and may be, for example, a position equivalent to the horizontal pipe connection portion 41 in the vertical direction.
The joint body 16 has been described as being 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.

In the above embodiment, the connecting pipe section 31 and the lower pipe section 33 of the lower connecting pipe 19 are sockets, but either one of them may be a spigot, or both may be spigots. When the connecting pipe section 31 or the lower pipe section 33 is a spigot, the connecting pipe section 31 and the lower pipe section 33 are straight pipes. In this case, the inner and outer diameters of the connecting pipe section 31 are approximately the same as the inner and outer diameters of the inclined pipe section 32 at the upper end of the third swirl vane 34. The inner and outer diameters of the lower pipe section 33 are approximately the same as the inner and outer diameters of the inclined pipe section 32 at the lower end of the third swirl vane 34.
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 .
In the above embodiment, the third swirl vane 34 is located inside the inclined pipe section 32 between the connecting pipe section 31 and the lower pipe section 33 so as not to interfere with the intermediate pipe 18 and the vertical pipe 46 inserted into the connecting pipe section 31 and the lower pipe section 33 as a receiving port. However, by making the connecting pipe section 31 and the lower pipe section 33 into spigots, it is possible to locate the upper end position of the third swirl vane 34 inside the connecting pipe section 31, to locate the lower end position of the third swirl vane 34 inside the lower pipe section 33, or to locate the third swirl vane 34 from the connecting pipe section 31 to the lower pipe section 33. In other words, the degree of freedom in the installation position of the third swirl vane 34 can be improved, and the third swirl vane 34 can be easily installed at a position to receive the wastewater flowing down from the first swirl vane 24.
In addition, while the third swirl vane 34 is made long in the vertical direction so that it overlaps with the connecting pipe section 31 and the lower pipe section 33, since the length of the connecting pipe section 31 and the lower pipe section 33 as receiving ports is not required, the overall length of the lower connecting pipe 19 can be shortened and the overall size of the collective joint 11 can be reduced, improving fit.
Furthermore, since the third swirl vane 34 is located within the floor slab 102, the floor slab 102 and mortar 103 can prevent sound generated from the third swirl vane 34 from leaking to the outside.

In addition, the components in the above embodiment may be replaced with well-known components as appropriate without departing from the spirit of the present invention, and the above-mentioned modifications may be combined as appropriate.

1 Group joint system 11 Group joint 16 Joint body 32a, 32b Connection part 34 Third swirl vane (swirl vane)
34c End 46 Vertical pipe L Reference line L2 Second reference line (reference line)
O Axis R1 Internal space S Area X Circumferential direction X1 First side θ1, θ2 Angle

Claims (2)

A group joint;
A vertical pipe connected to the collective joint;
Equipped with
The assembly joint comprises:
a joint body formed in a tubular shape, arranged with its axis along the vertical direction, and including an upper connecting pipe and a lower connecting pipe;
A swirl vane is provided on an inner peripheral surface of the joint body;
Equipped with
the lower connecting pipe includes an inclined pipe portion, a connecting pipe portion which is a socket provided at an upper portion of the inclined pipe portion, and a lower pipe portion provided at a lower portion of the inclined pipe portion,
the inclined pipe portion, the swirl vane, the connecting pipe portion, and the lower pipe portion are integrally molded by injection molding of polyvinyl chloride resin;
The swirl vane gradually extends toward a first side in a circumferential direction as it moves downward from above,
When the inner circumferential surface of the joint body is viewed from the inside in the radial direction so that a connection portion of the inner circumferential surface with an upper end portion of the swirl vane is located in front, an angle that the swirl vane forms with respect to the vertical direction is 10° or more and 45° or less,
When a line including a connection portion between the swirl vane and the joint body and an end of the swirl vane opposite to the connection portion in a cross-sectional view perpendicular to the axis of the swirl vane is defined as a reference line,
When viewed downward in the cross-sectional view, a ratio of an area of the internal space of the joint body, which is on an opposite side of the reference line from the tip of the first side of the swirl vane, to an area of the internal space of the joint body is 52 % or more regardless of a position in the axial direction of the cross-section that is the subject of the cross-sectional view,
A collective joint system, wherein, in a plan view, the ratio of the area of the swirl vanes in the internal space of the vertical tube to the area of the internal space of the vertical tube is 16% or more and 23% or less. The collective joint system according to claim 1, wherein, in the cross-sectional view, the angle at which the swirl vane is inclined toward the first side with respect to another reference line connecting the axis and the connection portion between the swirl vane and the joint body is 5° or more and 30° or less.

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