Drain pipe joint

Abstract

Provided is a drain pipe joint (20) comprising: a body part (40) that is inserted through a penetrating part of a floor slab defining an upper floor and a lower floor of a building; an upper receiver (32) formed at the upper end position of the body part (40) and to which a drain standpipe on the upper floor is connected; a lower end connection part (45) formed at the lower end position of the body part (40) and to which a drain standpipe on the lower floor is connected; and a horizontal branch pipe receiver (35) formed on a side surface of the body part (40) and to which a drain horizontal branch pipe on the floor slab is connected. An inner circumferential surface of the body part (40) is provided with a turning guide (57) which turns the drain flowing in the body part (40) in a direction opposite to the rotation direction of the Earth.

Description

Drainage pipe fittings

[0001] The present disclosure relates to a drainage pipe fitting comprising a body portion inserted into a penetration portion of a floor slab separating an upper floor from a lower floor of a building, an upper receiving port formed at the upper end position of the body portion and to which a drainage standpipe of the upper floor is connected, a lower end connection portion formed at the lower end position of the body portion and to which a drainage standpipe of the lower floor is connected, and a horizontal branch pipe receiving port formed on the side of the body portion and to which a drainage horizontal branch pipe on the floor slab is connected.

[0002] Japanese Patent Application Laid-Open Publication No. 2015-175187 describes a drain pipe joint used in building drainage equipment. As shown in FIGS. 5 and 6 , the drain pipe joint 100 described in this publication includes a deceleration guide 104 and a swivel guide 105, which are blades for slowing down and rotating the drainage water flowing down inside a body 102. The deceleration guide 104 is a blade whose primary purpose is to slow down the drainage water flowing down, causing it to rotate left while slowing down. In contrast, the swivel guide 105 is a blade whose primary purpose is to rotate the drainage water left, and also has the function of slowing down the drainage water. For this reason, the deceleration guide 104 is designed to have a smaller inclination angle than the swivel guide 105, and to have a larger blade area than the swivel guide 105, as shown in FIGS. 5 and 6 .

[0003] In drainage systems, the reason for swirling the wastewater flowing down is to create an air core in the axial part of the vertically extending drain pipe (drainage standpipe) to make the wastewater flow more easily. Also, the reason for swirling the wastewater flowing down in drainage systems is to take advantage of the Coriolis force caused by the rotation of the Earth.

[0004] That is, when water is allowed to flow naturally down a pipe (standpipe), in the Northern Hemisphere, the water is likely to swirl left due to the Coriolis force. For this reason, in general drainage facilities, in order to effectively utilize the Coriolis force, the flowing wastewater is made to swirl left using a swirl guide 105 or the like.

[0005] In addition, the purpose of slowing down the flowing wastewater is to prevent negative pressure in the drain pipe from increasing, especially on the upper floors of apartment buildings. Negative pressure in the drain pipe increases because the air resistance increases in proportion to the square of the flow speed of the wastewater. In other words, slowing down the flow speed of the wastewater is extremely effective in suppressing negative pressure in the drain pipe. When negative pressure in the drain pipe increases, the seal water (water in the U-shaped pipe) of the sanitary equipment in the house is sucked into the drain pipe. This causes the seal water of the sanitary equipment to break (disappear), causing a problem in which a foul odor in the drain pipe flows into the house. To prevent this, the flow speed of the wastewater is slowed down to suppress the increase in negative pressure in the drain pipe.

[0006] The drain pipe joint 100 described above is provided with a deceleration guide 104 and a swivel guide 105 for the purpose of slowing down and rotating counterclockwise the drainage water flowing down inside the body 102. Here, the deceleration guide 104 and the swivel guide 105 are both blades for the purpose of slowing down and rotating counterclockwise the drainage water, although to different degrees. In other words, multiple blades with similar functions are formed inside the body 102 of the drain pipe joint 100. Therefore, if these blades can be combined, the manufacturing cost of the drain pipe joint 100 can be reduced.

[0007] Therefore, there is a need for an improved drain pipe coupling, for example, a drain pipe coupling that can simply slow down and rotate wastewater flowing down the body of the drain pipe coupling.

[0008] A first aspect of the present disclosure is a drainage pipe fitting comprising: a body portion inserted into a penetration portion of a floor slab separating the upper and lower floors of a building; an upper receiving port formed at the upper end of the body portion and to which the drainage standpipe of the upper floor is connected; a lower end connection portion formed at the lower end of the body portion and to which the drainage standpipe of the lower floor is connected; and a horizontal branch pipe receiving port formed on the side of the body portion and to which a horizontal drainage branch pipe on the floor slab is connected, wherein a swivel guide is provided on the inner surface of the body portion to rotate the drainage water flowing down within the body portion in a direction opposite to the direction of the Earth's rotation.

[0009] In the Northern Hemisphere, the Earth rotates counterclockwise (left-handed). Therefore, the Coriolis force caused by the Earth's rotation acts in a direction that causes the wastewater flowing downstream to swirl counterclockwise. According to the present disclosure, the swirl guide is configured to swirl the wastewater in the direction opposite to the Earth's rotation. Therefore, the swirl guide causes the wastewater flowing downstream to swirl clockwise. In other words, the wastewater flowing downstream swirls in the opposite direction to the Coriolis force caused by the Earth's rotation. Therefore, the Coriolis force acts in a direction that resists the swirling flow of the wastewater, i.e., in the deceleration direction. Therefore, by adding the function of the deceleration guide to the swirl guide, it is possible to decelerate the swirling flow of the wastewater flowing downstream, without providing a special deceleration guide as in the conventional case. Therefore, according to this aspect, the wastewater flowing downstream within the body of the drain pipe fitting can be decelerated and swirled in a simple manner.

[0010] According to a second aspect of the present disclosure, the turning guide is formed to be inclined in the circumferential direction of the body portion so that the wastewater flowing down inside the body portion can be turned clockwise in the northern hemisphere, thereby making it possible to utilize the Coriolis force to slow down the wastewater.

[0011] According to a third aspect of the present disclosure, the swiveling guide is a shelf-like blade that protrudes radially inward from the inner surface of the body portion, and is configured to guide the wastewater flowing down the upper surface of the swiveling guide, and the inclination angle of the upper surface of the swiveling guide in the circumferential direction of the body portion is set in the range of 10° to 30° with respect to the axis of the body portion, for example, approximately 20°.

[0012] According to a fourth aspect of the present disclosure, the upper surface of the swivel guide is inclined so as to become lower as it moves radially inward from the position of the inner surface of the body, and the radial inclination angle of the upper surface of the swivel guide is set to a range of 0° to 10° with respect to the horizontal plane, for example, approximately 5° or less.

[0013] According to a fifth aspect of the present disclosure, the upper surface of the swivel guide is inclined so that it rises as it moves radially inward from the inner circumferential surface of the body. The inclination angle of the upper surface of the swivel guide in the radial direction is set to a range of 0° to 10° with respect to the horizontal plane. This allows the wastewater to be received and the swirl of the wastewater to be strengthened.

[0014] According to a sixth aspect of the present disclosure, the innermost peripheral edge of the swivel guide is located 20 mm to 40 mm from the axis of the body, thereby ensuring a passage for air to flow around the axis, allowing for smooth drainage and suppressing pressure fluctuations within the drain pipe.

[0015] According to a seventh aspect of the present disclosure, the upper surface of the swivel guide is fan-shaped, and therefore, by adjusting the area of ​​the upper surface of the swivel guide as necessary, the area that receives the drainage water can be adjusted.

[0016] According to an eighth aspect of the present disclosure, the cross-sectional shape of the swivel guide is flat, triangular, U-shaped, or V-shaped. By changing the cross-sectional shape of the swivel guide depending on the situation, it is possible to divert or receive wastewater by the swivel guide, and it is possible to adjust the speed and swirl direction of the wastewater.

[0017] According to a ninth aspect of the present disclosure, the swivel guide has an upper surface that is recessed downward. This allows the upper surface of the swivel guide to receive the wastewater, thereby slowing down the wastewater and strengthening the swirl of the wastewater.

[0018] FIG. 7 is a side view of a drainage system using a drain pipe fitting according to embodiment 1 of the present disclosure; FIG. 8 is a plan view of the drain pipe fitting according to embodiment 1 of the present disclosure; FIG. 9 is a longitudinal cross-sectional view of the drain pipe fitting (a cross-sectional view taken along arrows III-III of FIG. 2 (as seen from the front)); FIG. 10 is a longitudinal cross-sectional view of the drain pipe fitting (a cross-sectional view taken along arrows IV-IV of FIG. 2 (as seen from the left)); FIG. 11 is a longitudinal cross-sectional view of a conventional drain pipe fitting; FIG. 12 is a plan cross-sectional view of a conventional drain pipe fitting; FIG. 13 is a side view of a drain pipe fitting according to another embodiment; FIG. 14 is a cross-sectional view taken along arrows VIII-VIII of FIG. 7; FIG. 15 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 16 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 17 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 18 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 19 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 19 is an exploded view of a drain pipe fitting according to another embodiment; FIG. 19 is an exploded view of a drain pipe fitting according to another embodiment; FIG. 19 is a schematic view of a drain pipe fitting according to another embodiment; FIG. 19 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 19 is a longitudinal cross-sectional view of a drain pipe fitting according to another embodiment; FIG. 1 is a plan view of a drain pipe fitting according to another embodiment. FIG. 2 is a plan view of a drain pipe fitting according to another embodiment. FIG. 3 is a plan view of a drain pipe fitting according to another embodiment. FIG. 4 is a plan view of a drain pipe fitting according to another embodiment. FIG. 5 is a plan view of a drain pipe fitting according to another embodiment. FIG. 6 is a plan view of a drain pipe fitting according to another embodiment. FIG. 7 is a plan view of a drain pipe fitting according to another embodiment. FIG. 8 is a plan view of a drain pipe fitting according to another embodiment. FIG. 9 is a plan view of a drain pipe fitting according to another embodiment. FIG. 10 is a result of an in-pipe pressure test of a right-handed turning drain pipe fitting of the present disclosure. FIG. 11 is a result of an in-pipe pressure test of a conventional left-handed turning drain pipe fitting. FIG. 12 is a comparison result of the in-pipe pressure test results.

[0019] [Embodiment 1] A drain pipe fitting according to embodiment 1 of the present disclosure will be described below with reference to Figures 1 to 4. A drain pipe fitting 20 according to this embodiment is a drain pipe fitting used in drainage equipment 10 in medium- to high-rise buildings such as apartment buildings and office buildings. Here, the front, back, left, right, and top and bottom shown in the figures correspond to the front, back, left, right, and top and bottom of the drain pipe fitting 20.

[0020] <Overview of the Drainage System> As shown in FIG. 1 , the drainage system 10 includes drainage pipe fittings 20 installed on each floor, penetrating the floor slab CS separating the upper and lower floors of a building; drainage standpipes 70 connecting the drainage pipe fittings 20 on each floor; and horizontal drainage branch pipes (not shown) installed on the floor of each floor and connected to the drainage pipe fittings 20 on each floor. The ends of the horizontal drainage branch pipes are connected to sanitary appliances such as kitchen sinks and toilets in each residence. The drainage pipe fittings 20 are inserted through through-holes CH in the floor slab CS while covered with fire-resistant and soundproof covering material 80 (see the two-dot chain line). After installation of the drainage system 10 is completed, the through-holes CH are backfilled with mortar M, thereby securing the drainage pipe fittings 20 to the floor slab CS.

[0021] <Overview of the drain pipe joint 20> The drain pipe joint 20 is a joint that joins the drainage water guided by the drainage stand pipe 70 on the upper floor and the horizontal drainage branch pipe and allows it to flow down to the drainage stand pipe 70 on the lower floor. The drain pipe joint 20 is a resin joint, and as shown in Figures 1 to 3, is composed of an upper body section 30, a lower body section 40, and an interior member 50. The drain pipe joint 20 has an outer shape formed by connecting the upper body section 30 and the lower body section 40 from above and below. The interior member 50 is set inside the lower body section 40. The upper body section 30, the lower body section 40, and the interior member 50 are fixed to each other with an adhesive.

[0022] <Regarding the upper body portion 30 of the drain pipe fitting 20> The upper body portion 30 is a component that constitutes the upper portion of the drain pipe fitting 20 and is installed on the floor slab CS as shown in FIG. 1. As shown in FIG. 3 and other figures, the upper body portion 30 is composed of an upper socket 32 ​​provided at the upper end and an upper body main body 33 provided below the upper socket 32. As shown in FIG. 1, the upper socket 32 ​​is the portion into which the lower end insertion port 71s of the drain stand pipe 70 is inserted and connected, and as shown in FIG. 3, it has a cylindrical portion 32e and an inner flange portion 32f formed at the lower end position of the cylindrical portion 32e. A substantially cylindrical rubber sealant 26 that seals between the upper socket 32 ​​and the lower end insertion port 71s of the drain stand pipe 70 is housed within the cylindrical portion 32e of the upper socket 32 ​​and on the inner flange portion 32f. The lower part of the cylindrical part 32e of the upper socket 32 ​​is inserted from above into the cylindrical upper part (not shown) of the upper body 33 and fixed therein.

[0023] As shown in Figures 2 and 3, the upper body main body 33 of the upper body 30 has a plurality of horizontal branch pipe receptacles 35 formed at 90° intervals on the lower side of the cylindrical upper portion. Each horizontal branch pipe receptacle 35 is configured with a cylindrical portion 35e and an inner flange portion 35f formed at the base end of the cylindrical portion 35e. The horizontal branch pipe is directly inserted into the horizontal branch pipe receptacle 35 and fixed thereto with adhesive or the like. The upper body main body 33 also has a cylindrical lower portion 33d formed below the horizontal branch pipe receptacle 35 and coaxial with the upper cylindrical portion. The cylindrical lower portion 33d is configured to be inserted into and fixed in place in the large-diameter cylindrical portion 41 (described below) of the lower body 40 from above.

[0024] 4 and other figures, inflow prevention walls 37 are formed on the inner wall surface of the upper body main body 33, extending vertically on both sides of the opening 35h of the horizontal branch pipe receiving port 35. The inflow prevention walls 37 are walls for preventing the swirling wastewater flowing down from the upper receiving port 32 via the drainage standpipe 70 from flowing back toward the opening 35h of the horizontal branch pipe receiving port 35.

[0025] <Regarding the lower body portion 40 of the drainage pipe fitting 20> The lower body portion 40 is a member that constitutes the central to lower portion of the drainage pipe fitting 20, and is embedded in the floor slab CS as shown in Figure 1 etc. The lower end portion (small diameter cylindrical portion 45) of the lower body portion 40 protrudes downward (towards the lower floor) from the floor slab CS. The lower body portion 40 comprises, in order from top to bottom, a large diameter cylindrical portion 41, a tapered portion 43, and a small diameter cylindrical portion 45. The large diameter cylindrical portion 41, tapered portion 43, and small diameter cylindrical portion 45 are formed coaxially. As described above, the cylindrical lower portion 33d of the upper body main body 33 is inserted from above into the large diameter cylindrical portion 41 of the lower body portion 40 and fixed in place. As shown in Figure 1, the small diameter cylindrical portion 45 of the lower body portion 40 is configured to protrude a certain distance from the ceiling surface of the floor slab CS, and the upper end insertion port 71u of the drainage vertical pipe 70 on the lower floor is inserted and connected thereto.

[0026] <Regarding the interior member 50 of the drain pipe fitting 20> As shown in Figures 3 and 4, the interior member 50 of the drain pipe fitting 20 is a member that is set inside the lower body section 40 and fixed to the inner circumferential surface of the lower body section 40. The interior member 50 is composed of a cylindrical section 52, a swivel guide support section 54, and a swivel guide 57. As shown in Figures 3 and 4, the cylindrical section 52 is coaxially fitted into the large diameter cylindrical section 41 of the lower body section 40 below the cylindrical lower section 33d of the upper body main body 33, and is fixed to the inner circumferential surface of the large diameter cylindrical section 41. This allows the inner circumferential surface of the cylindrical lower section 33d of the upper body section 30 and the inner circumferential surface of the cylindrical section 52 of the interior member 50 to be continuous without any steps.

[0027] The swivel guide support portion 54 of the interior member 50 is a member that supports the swivel guide 57 below the cylindrical portion 52. As shown in Fig. 4, the swivel guide support portion 54 is a plate that has a substantially triangular front shape and is curved in an arc to fit the inner circumferential surface of the lower body portion 40, and its upper edge is joined to the lower edge of the cylindrical portion 52. As shown in Fig. 3, the swivel guide support portion 54 is fixed to the inner circumferential surfaces of the large-diameter cylindrical portion 41 and the tapered portion 43 of the lower body portion 40 while being in surface contact with these inner wall surfaces. Then, as shown in Fig. 4 and other figures, the swivel guide 57 is fixed to the swivel guide support portion 54 at a position on an edge that corresponds to one slanted side of the triangle.

[0028] The swivel guide 57 is a guide blade for causing the wastewater flowing down inside the body portions 30, 40 of the drain pipe joint 20 to swirl clockwise. Here, in the Northern Hemisphere, the Earth rotates counterclockwise (left-handed), so the Coriolis force (revolutionary force) acts counterclockwise. Therefore, for example, when water is allowed to flow naturally down inside a pipe (standpipe), the Coriolis force causes the water to tend to swirl counterclockwise. In this embodiment, the swivel guide 57 causes the wastewater flowing down to swirl clockwise against the Coriolis force.

[0029] <Regarding the swivel guide 57> The swivel guide 57 is formed in a shelf-like shape that protrudes radially inward from the position of the swivel guide support portion 54, which is formed in a planar arc shape. The upper surface 57u of the swivel guide 57 guides the wastewater flowing down. The swivel guide 57 and the swivel guide support portion 54 are fixed to the inner wall surface on the right side of the lower body portion 40, as shown in Figures 3 and 4. The upper surface 57u of the swivel guide 57 is inclined in the circumferential direction so that it is higher on the rear side of the lower body portion 40 and lower on the front side. Therefore, the wastewater flowing down inside the body portions 30, 40 of the drain pipe fitting 20 turns right due to the action of the swivel guide 57, as shown in Figure 2 and other figures.

[0030] Here, the angle of inclination in the circumferential direction of the upper surface 57u of the swivel guide 57, i.e., the angle of inclination of the upper surface 57u of the swivel guide 57 with respect to the axis of the drain pipe joint 20 as shown in FIG. 4, is set to θ1. Here, θ1 is preferably set to, for example, approximately 20°. Furthermore, the upper surface 57u of the swivel guide 57 is inclined so as to become lower as it moves radially inward from the position of the swivel guide support portion 54. The angle of inclination in the radial direction of the upper surface 57u of the swivel guide 57 is set to θ2 as shown in FIG. 3. θ2 is set to, for example, approximately 1.5°. Note that θ2 is preferably set to 5° or less.

[0031] <Operation of the drain pipe joint 20> When drainage water flows into the upper body section 30 of the drain pipe joint 20 from the drainage stand pipe 70 on the upper floor and the drainage horizontal branch pipe, it flows along the upper surface 57u of the swivel guide 57 as it flows down from the upper body section 30 to the lower body section 40, and turns right as shown by the white arrow in Figures 2 to 4. Then, the drainage water that has turned right flows down from the lower end section (small diameter cylindrical section 45) of the lower body section 40 of the drain pipe joint 20 into the drainage stand pipe 70 on the lower floor.

[0032] As mentioned above, the Coriolis force caused by the rotation of the Earth acts in a direction that causes the wastewater flowing downstream to swirl counterclockwise. In contrast, in the drain pipe joint 20, the swirl guide 57 acts to cause the wastewater to swirl in the opposite direction (clockwise) to the Coriolis force. As a result, the Coriolis force acts in a direction that acts as a resistance to the flow of wastewater swirling to the right. In other words, the Coriolis force slows down the swirling flow. Therefore, without providing a special deceleration guide as in the conventional system, it is possible to slow down the swirling flow of the wastewater flowing downstream by adding the function of a deceleration guide to the swirl guide 57.

[0033] <Regarding correspondence between terms used in this embodiment and terms related to this disclosure> The upper body 30 and the lower body 40 of the drain pipe fitting 20 in this embodiment correspond to the body of the drain pipe fitting in this disclosure. Also, the small diameter cylindrical portion 45 of the lower body 40 of the drain pipe fitting 20 corresponds to the lower end connection portion of the body of the drain pipe fitting in this disclosure.

[0034] <Advantages of the drain pipe fitting 20 according to this embodiment> According to the drain pipe fitting 20 according to this embodiment, the swirl guide 57 is configured to swirl the wastewater in the direction opposite to the direction of the Earth's rotation (clockwise rotation). Therefore, the swirl guide 57 causes the wastewater flowing downstream to swirl clockwise. In other words, the wastewater flowing downstream swirls in the opposite direction to the Coriolis force caused by the Earth's rotation. As a result, the Coriolis force acts in a direction that resists the swirling flow of the wastewater (slowing down direction). Therefore, without providing a special deceleration guide as in the past, the swirling flow of the downstream wastewater can be slowed down by adding a deceleration guide function to the swirl guide 57.

[0035] Other Embodiments The present disclosure is not limited to the above-described embodiments, and modifications are possible within the scope of the present disclosure. For example, in the first embodiment, the inclination angle θ1 of the upper surface 57u of the swivel guide 57 relative to the axis of the drain pipe joint 20 is set to approximately 20°. However, the inclination angle θ1 can be set within a range of 10° to 30° depending on the situation. Also, in the first embodiment, the inclination angle θ2 of the upper surface 57u of the swivel guide 57 in the radial direction is set to approximately 1.5°. However, the inclination angle θ2 in the radial direction can be set within a range of 0° to 10° depending on the situation. Furthermore, in the first embodiment, an interior member 50 including a swivel guide 57 is set and fixed within the lower body 40 of the drain pipe joint 20. However, as shown in FIG. 18 , the swivel guide 57 can be integrally formed with the lower body 40 of the drain pipe joint 20. Furthermore, in the first embodiment, the drain pipe joint 20 is made of resin, but the drain pipe joint 20 can also be manufactured from cast iron.

[0036] Although the first embodiment does not mention specific dimensions of the drain pipe joint 20, for example, when the diameter of the large diameter cylindrical portion 41 of the lower body portion 40 is 160 mm, the diameter of the small diameter cylindrical portion 45 may be 100 mm to 130 mm. In addition, a reinforcing girder for reinforcing the swivel guide 57 may be formed on the underside of the swivel guide 57 so as to extend in the width direction of the swivel guide 57. This increases the rigidity of the swivel guide 57 and suppresses noise due to vibration.

[0037] Although the first embodiment did not specifically mention the shape of the upper surface 57u of the swivel guide 57, the upper surface 57u when viewed head-on may be fan-shaped as in the embodiments shown in Figures 7 and 8. Specifically, the upper surface 57u of the swivel guide 57 has an upper edge 57e, an inner peripheral edge 57p, and an arc-shaped portion 57a ​​that follows the inner wall surface of the lower body 40. The upper edge 57e is located above the center point P of the fan shape and extends from the center point P to the upper end of the arc-shaped portion 57a. The inner peripheral edge 57p is located below the center point P and extends from the center point P to the lower end of the arc-shaped portion 57a. The inner peripheral edge 57p faces the axis O of the upper body 30 and the lower body 40 of the drain pipe fitting 20. For example, when θ1 in FIG. 7 is 20°, the upper edge 57e of the swivel guide 57 shown in FIG. 8 extends in a direction rotated 40° clockwise around the center point P with respect to the extension of the inner peripheral edge 57p. When the angle between the upper edge 57e and the extension of the inner peripheral edge 57p is θ3°, θ3 can be between 0° and 40°. In other words, the central angle of the sector is equal to 180° - θ3°, and can be in the range of 140° to 180°. When θ3° is 0°, the upper edge 57e and the inner peripheral edge 57p are located on the same line, and the upper surface 57u is crescent-shaped. The innermost peripheral edge of the swivel guide 57 may also be located at a distance d of 20 mm to 40 mm from the axis O.

[0038] In the first embodiment, the swivel guide 57 is formed in a shelf-like shape that protrudes radially inward from the position of the swivel guide support portion 54, which is formed in a planar arc shape, as shown in FIGS. 3 and 4 . However, the shape of the swivel guide 57 can be flexibly modified as needed. For example, the swivel guide 57 may have a downwardly recessed gutter portion 57g, as shown in the embodiment shown in FIG. 9 . The gutter portion 57g extends in a substantially linear fashion from approximately the center of the upper edge 57e in FIG. 8 to the arc portion 57a ​​in a top view. By providing the gutter portion 57g in the swivel guide 57, wastewater can flow along the upper surface 57u. Alternatively, the gutter portion 57g extends in an arc shape from approximately the center of the upper edge 57e to the inner peripheral edge 57p. This allows wastewater to rotate along the upper surface 57u. While the swivel guide 57 shown in FIG. 9 has a U-shaped cross section, it may also have a V-shaped cross section.

[0039] The swivel guide 57 may also be flat and protrude radially inward from the inner wall surface of the lower body section 40, as in the embodiment shown in Figures 10 and 11. Furthermore, the swivel guide 57 may have a laterally inclined V-shaped cross section, as in the embodiment shown in Figure 12. Specifically, the swivel guide 57 has a flat plate portion 57f and a support portion 57s. The flat plate portion 57f protrudes radially inward from the inner wall surface of the lower body section 40. The support portion 57s extends obliquely downward from the end of the flat plate portion 57f toward the inner wall surface of the lower body section 40 to support the flat plate portion 57f. This reinforces the swivel guide 57. The swivel guide 57 may also have a triangular cross section 57t tapering radially inward from the inner wall surface of the lower body section 40, as in the embodiment shown in Figure 13.

[0040] In the first embodiment, the inclination angle θ2 of the upper surface 57u of the swivel guide 57 in the radial direction is 1.5° downward with respect to the horizontal plane, as shown in FIG. 3 . However, as shown in the embodiments shown in FIGS. 14 to 16 , θ2 can be set within a range of 0° to 10° with respect to the horizontal plane. In this case, as θ2 increases upward, the swivel guide 57 receives the wastewater, thereby strengthening the rotation of the wastewater. On the other hand, as the inclination angle θ2 increases downward, the wastewater can be diverted more easily. For example, in the example shown in FIG. 15 , θ2 is 5° upward, allowing the wastewater to be received by the upper surface 57u of the swivel guide 57 and the inner wall surface of the lower body section 40. Note that in the example shown in FIG. 14 , θ2 is 5°, and in the example shown in FIG. 16 , θ2 is 0° (θ2 is not shown in FIG. 16 ).

[0041] In the first embodiment, the swivel guide 57 is exemplified as part of the interior member 50 fixed to the lower body section 40 as shown in Fig. 3, but as in the embodiment shown in Fig. 17, it can also be formed integrally with the lower end of the upper body section 30 as part of the upper body section 30. This eliminates the need to fix an interior member, making it easier to assemble the drain pipe joint.

[0042] In the first embodiment, an example has been shown in which one swivel guide 57 is provided for one drain pipe joint 20, but multiple swivel guides 57 may also be provided for one drain pipe joint 20. For example, as in the embodiment shown in Figure 19, two swivel guides 57 may be provided for one drain pipe joint 20 used in a skyscraper. In this case, the multiple swivel guides 57 may be arranged at the same height position as in the embodiment shown in Figure 20, or may be arranged at different height positions as in the embodiment shown in Figure 21. Furthermore, the multiple swivel guides 57 may each have a different inclination angle θ1.

[0043] In the first embodiment, the swivel guide 57 is fixed to the inner wall surface on the right side of the lower body section 40 as shown in FIGS. 3 and 4 . However, the fixing position of the swivel guide 57 can be changed as needed. For example, as in the embodiment shown in FIGS. 22 to 24 , the swivel guide 57 may be disposed above or below one of the horizontal branch pipe receptacles 35, or may be disposed on a wall surface where no horizontal branch pipe receptacle 35 is located as shown in FIG. 25 . Furthermore, as in the embodiment shown in FIGS. 22 to 25 , the swivel guide 57 may be disposed so that a portion extending from the approximate center to the bottom of the swivel guide 57 intersects with the central axis C of the horizontal branch pipe receptacle 35 in a top view. In this case, the upper edge 57e of the swivel guide 57 may be adjacent to the end of the horizontal branch pipe receptacle 35. This allows the entire swivel guide 57 to receive wastewater flowing down from the horizontal branch pipe receptacle 35. 26 to 29, the swivel guide 57 may be disposed so that the upper edge 57e of the swivel guide 57 is parallel to the central axis C and is located near the central axis C. This allows the swivel guide 57 to receive wastewater flowing down mainly along the central axis C of the horizontal branch pipe receiving port 35.

[0044] In addition, an in-pipe pressure test was conducted using the right-handed drain pipe fitting described in this disclosure and a conventional left-handed drain pipe fitting. Figures 30 to 32 show the test results. This test conforms to the SHASE-S 218 standard of the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan, "Test Method for Drainage Capacity of Drainage Stack Systems in Apartment Buildings." The right-handed and left-handed drain pipe fittings differ only in the drainage swirl direction, and all other conditions are the same.

[0045] Figure 30 shows test results using a right-turn drain pipe fitting according to the present disclosure, and Figure 31 shows test results using a conventional left-turn drain pipe fitting. The median value in the graph is the sum of the maximum and minimum pipe pressure values ​​on each floor, divided by two. The graph in Figure 32 compares the median pipe pressure values ​​for right-turn and left-turn drain pipes. This graph shows that the median values ​​when using a right-turn drain pipe fitting are generally closer to positive pressure than the median values ​​when using a left-turn drain pipe fitting. Therefore, by using a right-turn drain pipe fitting according to the present disclosure, problems caused by the pressure inside the pipe tending toward negative pressure can be reduced compared to conventional left-turn drain pipes. That is, for example, problems such as the seal water of a sanitary appliance in a home being sucked into the drain pipe, causing the seal water of the sanitary appliance to break and allowing an unpleasant odor inside the drain pipe to flow into the home can be reduced.

[0046] The various embodiments described above in detail with reference to the accompanying drawings are exemplary of the present invention and are not intended to limit the scope of the present invention. The detailed description teaches one of ordinary skill in the art how to make, use, and / or practice various aspects of the present teachings, but is not intended to limit the scope of the present invention. Furthermore, each of the additional features and teachings described above can be applied and / or used separately or in conjunction with other features and teachings to provide improved drain pipe fittings and / or methods of making and using the same.

Claims

1. A drainage pipe joint comprising: a body portion that is inserted into a penetration portion of a floor slab that separates an upper floor from a lower floor of a building; an upper receiving port formed at the upper end position of the body portion to which the drainage stand pipe of the upper floor is connected; a lower end connection portion formed at the lower end position of the body portion to which the drainage stand pipe of the lower floor is connected; and a horizontal branch pipe receiving port formed on a side of the body portion to which a horizontal drainage branch pipe on the floor slab is connected, wherein a swivel guide is provided on the inner surface of the body portion to rotate the drainage water flowing down inside the body portion in the direction opposite to the direction of the earth's rotation.

2. A drain pipe joint as described in claim 1, wherein the swivel guide is formed at an incline in the circumferential direction of the body so that, in the northern hemisphere, wastewater flowing down within the body can be made to rotate to the right.

3. A drain pipe joint as claimed in claim 1 or 2, wherein the swivel guide is a shelf-like blade protruding radially inward from the inner circumferential surface of the body and is configured to guide the drainage water flowing down the upper surface of the swivel guide, and the inclination angle of the upper surface of the swivel guide in the circumferential direction of the body is set in the range of 10° to 30° with respect to the axis of the body.

4. A drain pipe joint as described in claim 3, wherein the upper surface of the swivel guide is inclined so as to become lower as it moves radially inward from the position of the inner circumferential surface of the body, and the inclination angle in the radial direction of the upper surface of the swivel guide is set in the range of 0° to 10° with respect to the horizontal plane.

5. A drain pipe joint as described in claim 3, wherein the upper surface of the swivel guide is inclined so as to become higher as it moves radially inward from the position of the inner circumferential surface of the body, and the inclination angle in the radial direction of the upper surface of the swivel guide is set in the range of 0° to 10° with respect to the horizontal plane.

6. A drain pipe joint as claimed in claim 1 or 2, wherein the innermost peripheral edge of the swivel guide is located 20 mm to 40 mm from the axis of the body portion.

7. A drain pipe joint as claimed in claim 1 or 2, wherein the upper surface of said swivel guide is sector-shaped.

8. A drain pipe joint as described in claim 2, wherein the cross-sectional shape of the swivel guide is flat, triangular, U-shaped, or V-shaped.

9. A drain pipe joint as claimed in claim 8, wherein said swivel guide has a downwardly concave upper surface.

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