Drain pipe joint

Abstract

To provide a drain pipe joint that is made from synthetic resin but enables improvement of a drainage capacity and prevention of back flow to a horizontal branch pipe.SOLUTION: A drain pipe joint 1 includes an upper connection member 10 and a lower connection member 30 that are coupled to an upper part of a joint member 20 and a lower part of the joint member 20, respectively. The upper connection member 10 comprises a guide pipe 12 having an upper revolving blade 16 for applying revolving force to drainage water. The lower connection member 30 is a cylindrical body whose whole body has a funnel shape having a diameter reducing as it goes downward, and comprises a lower revolving blade 31 for mainly receiving and applying revolving force to drainage water guided by the upper revolving blade 16. The joint member 20 is formed so as to have a diameter slightly larger than that of the guide pipe 12 and receives internal fitting of the guide pipe 12. A lower end of the guide pipe 12 is formed so as to be positioned below an upper part of a horizontal branch pipe HT connected to the joint member 20, and a lower end peripheral edge 13a of the guide pipe 12 (guide body 13) is formed so as to deviate downward as it goes from an outer peripheral surface to an inner peripheral surface.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a drainage pipe joint installed in buildings and structures such as apartment buildings, hotels, office buildings, etc. [Background technology]

[0002] Drainage pipe joints are typically installed by embedding them in the floor slab midway along a drainage rise pipe that runs vertically through a high-rise building. It is known that drainage pipe joints can be made into a shape that can be molded from synthetic resin by comprising three parts: an upper connecting member to which the rise pipe is connected at its upper part, a lower connecting member to which the rise pipe is connected at its lower part, and a joint member to which a horizontal branch pipe is connected at the middle part of the two (Patent Document 1).

[0003] Inside such a drain pipe joint, a swirl vane is provided to impart a swirl to the drainage water flowing downstream, thereby swirling the drainage water and forming an air core at the center of the swirl to prevent fluctuations in the pressure inside the pipe, thereby improving the drainage capacity.

[0004] In addition, by forming the inner diameter of the joint member in the middle section to be large, even if drainage occurs from the horizontal branch pipe, the air core will not decrease or disappear, and high drainage capacity can be expected.

[0005] Furthermore, by providing backflow prevention plates extending in the longitudinal direction of the joint member on the inner pipe walls located on both sides of the opening of the connecting portion of the lateral branch pipe within the joint member, it is possible to prevent wastewater from flowing back into the lateral branch pipe.

[0006] This type of drain pipe joint is designed to improve drainage capacity by adjusting the position of the upper and lower blades, etc. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent Publication No. 2011-117133 Summary of the Invention [Problem to be solved by the invention]

[0008] However, while this type of drainage pipe joint can be molded as a single unit using synthetic resin, making it possible to make it lighter and slimmer, there are problems with it such that it has insufficient drainage capacity and is not able to adequately prevent backflow into the side branch pipe.

[0009] In particular, as described in Patent Document 1, the drainage capacity is 7.5 liters / second for a design with an inner diameter of the upper and lower straight cylindrical sections of 100 mm, an inner diameter of the middle section of 120 mm, an inner diameter of the branch pipe connection port of 77 mm, and a total length of 617 mm.

[0010] In addition, the drain pipe joint in Patent Document 1 is a so-called two-outlet type drain pipe joint with two side branch pipes, and there is a concern that if another side branch pipe were to be connected to this drain pipe joint (to make it three-outlet), the drainage capacity would decrease and backflow into the side branch pipe would also increase.

[0011] However, with the recent trend towards taller buildings, there is a demand for improved drainage capacity in drainage pipe joints, while there is still a demand for them to be lighter and slimmer, and the drainage pipe joint described in Patent Document 1 does not have sufficient capacity.

[0012] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a drainage pipe joint which is made of synthetic resin and yet has improved drainage capacity and prevents backflow into a lateral branch pipe. [Means for solving the problem]

[0013] In order to solve the above problem, the invention of claim 1 is a drainage pipe joint comprising an upper connecting member to which a standpipe arranged above is connected, a lower connecting member to which a standpipe arranged below is connected, and a coupling member to which a horizontal branch pipe arranged in a slab is connected, the upper connecting member being connected to the upper part of the coupling member and the lower connecting member being connected to the lower part of the coupling member, wherein the upper connecting member is provided with an induction pipe having upper swirl vanes that impart a swirling force to the drainage water flowing in the pipe, the lower connecting member is a funnel-shaped cylinder whose diameter decreases as it goes downward, and mainly receives the drainage water guided to the upper swirl vanes and further comprises lower swirl vanes that impart a swirling force, the coupling member is formed with a diameter one size larger than the induction pipe and fits the induction pipe internally, the lower end of the induction pipe is located lower than the upper part of the horizontal branch pipe connected to the coupling member, and the peripheral edge of the lower end of the induction pipe is formed so as to be biased downward as it goes from the outer circumferential surface to the inner circumferential surface.

[0014] The invention of claim 2 is characterized in that, in the drainage pipe joint described in claim 1, the guide pipe comprises a cylindrical guide body and an outer cylindrical body that covers the guide body at approximately the center of the length of the guide body, the upper part of the outer cylindrical body narrows in diameter as it goes upward and is joined integrally to the guide body, and the joint member is fitted with the outer cylindrical body. Effect of the Invention

[0015] According to the invention of claim 1, the lower end of the guide pipe is located lower than the upper part of the side branch pipe connected to the coupling member, and the peripheral edge of the lower end of the guide pipe is formed so as to be biased downward as it moves from the outer peripheral surface to the inner peripheral surface. Therefore, the wastewater flowing down the inner peripheral surface of the guide pipe does not flow toward the outer peripheral surface at the peripheral edge of the lower end. As a result, the wastewater does not flow toward the side branch pipe, and therefore backflow into the side branch pipe can be prevented.

[0016] According to the invention of claim 2, the guide pipe has a double structure consisting of a guide main body and an outer cylindrical body, and the coupling member is adapted to be fitted into the outer cylindrical body. This makes it possible to separate the opening of the side branch pipe connected to the coupling member from the rise pipe flowing through the guide pipe, thereby making it possible to further reduce backflow into the side branch pipe. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 shows an embodiment of the present invention together with FIG. 2 to FIG. 23, and is a front view of a drainage pipe joint. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. [Figure 4] FIG. 2 is a cross-sectional view taken along line BB in FIG. [Diagram 5] FIG. 2 is a cross-sectional view taken along line CC in FIG. [Figure 6] FIG. 2 is a cross-sectional view taken along line DD in FIG. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. [Figure 10] 10 is a cross-sectional view taken along line EE in FIG. 9. [Figure 11] FIG. 9 is a cross-sectional view taken along the line FF in FIG. [Figure 12] FIG. 9 is a cross-sectional view taken along line GG in FIG. [Figure 13] FIG. 11 is a cross-sectional view taken along line HH in FIG. [Figure 14] FIG. [Figure 15] FIG. [Figure 16] 16 is a cross-sectional view taken along line II in FIG. 15. [Figure 17] FIG. 17 is a cross-sectional view taken along line JJ in FIG. [Figure 18] FIG. 16 is a cross-sectional view taken along line KK in FIG. [Figure 19]FIG. 17 is a cross-sectional view taken along line LL in FIG. [Figure 20] FIG. [Figure 21] FIG. 21 is a cross-sectional view taken along line MM in FIG. 20. [Figure 22] FIG. 21 is a cross-sectional view taken along line NN in FIG. 20. [Diagram 23] 21 is a cross-sectional view taken along line OO in FIG. 20. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, the present invention will be described based on the illustrated embodiment.

[0019] The drainage pipe joint 1 is composed of an upper connecting member 10 that connects the vertical pipe VT located above, a joint member 20 that is connected to the lower part of the upper connecting member 10 and connects three horizontal branch pipes HT, and a lower connecting member 30 that is connected to the lower part of the joint member 20 and connects the vertical pipe VT located below (see Figure 1).

[0020] The upper connecting member 10, the lower connecting member 30, and the joint member 20 are all made of synthetic resin, and these are connected together to form an inner pipe, the outer periphery of which is covered with fiber-mixed mortar to form the drainage pipe joint 1. In the following explanation, the fiber-mixed mortar layer will be omitted.

[0021] Drain pipe joint 1 has three side branch pipes HT connected so that it forms a roughly T-shape in plan view (see Fig. 2). Fig. 1 is a front view, and in Fig. 1, the side branch pipe HT located at the front is called the central side branch pipe HTC, the side branch pipe HT located on the left side is called the left side branch pipe HTL, and the side branch pipe HT located on the right side is called the right side branch pipe HTR. The left-right and front-back directions in Fig. 1 (directions on the paper in Fig. 1) will be described as the same directions as those in the explanation of drain pipe joint 1.

[0022] In addition, the drainage pipe joint 1 in the embodiment described below is shown as an example in which a vertical pipe VT with an inner diameter of approximately φ100 mm and a horizontal branch pipe HT with an inner diameter of approximately φ77 mm are connected, and the inner diameter of the joint body 21 of the joint member 20 is approximately φ134 mm and the overall vertical length is approximately 720 mm.

[0023] The upper connecting member 10 comprises a receiving body 11 to which the upper standpipe VT is connected and a guide pipe 12 to which a joint member 20 is connected (see Figs. 1 and 3).

[0024] The receptacle 11 is made up of three integrally formed cylinders: an upper portion 11a, a middle portion 11b, and a lower portion 11c, with the upper portion 11a having a larger diameter than the middle portion 11b, and the lower portion 11c having a slightly larger diameter than the middle portion 11b, with the standpipe VT being connected to the upper portion 11a and the guide pipe 12 being connected to the lower portion 11c. The length of the receptacle 11 in the vertical direction is about 140 mm.

[0025] In addition, the inner diameter of the rise pipe VT, the inner diameter of the middle portion 11b, and the inner diameter of the guide pipe 12 are formed to be approximately the same (for example, φ100 mm), and when the rise pipe VT and the guide pipe 12 are connected to the receiving body 11, the inner surfaces of the rise pipe VT, the receiving body 11, and the guide pipe 12 become continuous surfaces so that no steps are created (see Figure 3).

[0026] In addition, when the inside diameter of the rise pipe VT is slightly larger than the inside diameter of the guide pipe 12, the middle part 11b of the receiving body 11 may be tapered downward. In any case, it is preferable that, when the rise pipe VT and the guide pipe 12 are connected to the receiving body 11, the inner peripheral surface of the rise pipe VT, the inner peripheral surface of the middle part 11b of the receiving body 11, and the inner peripheral surface of the guide pipe 12 are continuous surfaces, and no steps are generated.

[0027] The guide tube 12 is composed of a cylindrical guide body 13 and an outer cylinder 14 that covers the guide body 13 at approximately the center in the longitudinal direction of the guide body 13, and the upper part of the outer cylinder 14 is tapered in diameter as it goes upward and is joined integrally to the guide body 13. The length of the guide tube 12 in the vertical direction is formed to be approximately 220 mm (see FIG. 10).

[0028] The length of the outer cylinder 14 is about 1 / 3 (about 70 mm) of the guiding body 13, and is formed at a position about 80 mm downward from the upper edge of the guiding body 13, so that the lower edge of the guiding body 13 is positioned lower than the lower end of the outer cylinder 14 (see Figure 10).

[0029] The lower end peripheral edge 13a of the guide body 13 is chamfered so that its outer peripheral surface is biased inward as it goes downward, and the inner peripheral surface is formed into an almost straight surface. In reality, due to the die cutting, 13b is slightly enlarged in diameter as it goes downward (see Figures 3 and 10).

[0030] The wastewater that flows down along the inner peripheral surface of the guide body 13 does not flow outward at the lower end peripheral edge 13a, i.e., toward the side branch pipe HT, and therefore backflow into the side branch pipe HT is prevented (see FIG. 3). Note that the lower end peripheral edge 13a of the guide body 13 is not limited to being chamfered, and may be formed into a rounded surface.

[0031] Furthermore, as described above, the guide pipe 12 is composed of a cylindrical guide body 13 and an outer cylindrical body 14 that covers the guide body 13. By externally fitting the coupling member 20 onto the outer cylindrical body 14, the open end face of the horizontal branch pipe HT connected to the coupling member 20 can be separated from the inner surface of the guide body 13 through which the vertical pipe flow flows, thereby making it possible to better prevent backflow into the horizontal branch pipe HT.

[0032] An upper outer periphery 14a of the outer cylinder 14 is formed to be thicker than an outer cylinder main body 14b below it, and a step is formed between the outer cylinder main body 14b (see FIG. 10).

[0033] A protrusion 15 having a triangular recess 15a for positioning is integrally formed on the upper outer periphery 14a of the outer cylinder body 14 toward the front (see Figs. 1 and 7). The side of the drain pipe joint 1 on which the protrusion 15 is formed is the front.

[0034] The inner surface of the guide body 13 is provided with upper swirl vanes 16 that impart a swirl to the wastewater flowing down the pipe, and a control guide 17 to prevent the swirled wastewater from flowing into the left-side branch pipe HTL (see Figures 10 and 11).

[0035] The upper swirling blade 16 is a semi-arch-shaped plate, with the arc portion joined to the inner surface of the induction body 13 and the chord portion formed integrally with the front (nearby) inner surface of the induction body 13 so as to protrude toward the center of the induction body 13. The upper swirling blade 16 is inclined at approximately 30 degrees with respect to the vertical direction (pipe core), and is arranged so that the chord portion extends in the left-right direction when viewed in a plane (see Figure 8).

[0036] If the width of the upper swirl vane 16 is too small, the swirling force of the wastewater flowing down will be small, and if it is too large, the flow will be blocked and the air core will become small, so it is preferable to make the width about 1 / 3 of the inner diameter of the guide body 13. For example, when the inner diameter of the guide body 13 is φ100 mm, the width of the upper swirl vane 16 is formed to 30 mm. Note that the "width of the swirl vane" here refers to the dimension of the widest part of the bow shape.

[0037] The upper swirl vane 16 is formed such that its upper end is almost the same as or slightly below the upper edge of the induction body 13 and its lower end is 40 mm above the lower edge of the induction body 13, and the length of the upper swirl vane 16 in the vertical direction is about 180 mm. The upper swirl vane 16 is formed so as to incline from the upper right to the lower left when viewed from the rear (see FIG. 10). The lower end of the upper swirl vane 16 is at a position 40 mm above the lower edge of the induction body 13, and the lower inner surface 13b within a range of 40 mm below the upper swirl vane 16 of the inner circumferential surface of the induction body 13 is a straight cylinder portion except for the control guide 17.

[0038] As a result, when the wastewater hits the receiving surface 16a of the upper swirl vane 16, a swirling force in a counterclockwise direction in a plan view is applied to the wastewater, causing it to flow down (see FIG. 8). Since this swirling flow is subjected to centrifugal force, if the lower end of the upper swirl vane 16 and the lower end of the guiding body 13 were in the same position, the swirling flow that leaves the inner peripheral surface of the guiding body 13 would fly out in the direction of the side branch pipe HT (outward) and flow back into the side branch pipe HT, but as described above, the lower end of the upper swirl vane 16 is formed above the lower edge of the guiding body 13, so that the wastewater flows down while swirling around the inner peripheral surface of that part of the guiding body 13, and is prevented from flying out in the direction of the side branch pipe HT, preventing backflow into the side branch pipe HT.

[0039] In other words, the position where the lower end of the upper swirl vane 16 is biased 40 mm above the lower edge of the guide body 13 is a height at which the wastewater hitting the upper swirl vane 16 does not flow into the horizontal branch pipe HT, but is guided to the main lower swirl vane 31 of the lower connecting member 30 described later.

[0040] The control guide 17 is a vertically long protrusion protruding from the inner peripheral surface on the rear side of the guide body 13, and is formed at a position 40 degrees counterclockwise from the front-to-rear direction with the central angle of the pipe core as the center in a plan view. It has a length in the vertical direction of approximately 100 mm, a thickness of 5 mm, and a protrusion of 10 mm from the inner peripheral surface, and its lower end is formed so as to contact the lower edge of the guide body 13 (see Figure 8).

[0041] Moreover, the control guide 17 has a flattened trapezoidal shape when viewed from the side (circumferential direction), with the upper 1 / 3 and lower 1 / 3 in the length direction being inclined surfaces and the central portion being flat (see FIG. 11).

[0042] In addition, the control guide 17 is formed at a position that is 40 degrees counterclockwise from the front-to-back direction with the pipe core as the center when viewed in a plane, that is, at a position that is approximately 220 degrees counterclockwise from the center of the upper swirl vane 16 (see Figures 4 and 8).

[0043] The wastewater to which a counterclockwise swirling force is applied by the upper swirling vane 16 provided on the inner peripheral surface on the front side of the guide body 13 swirls and flows down along the inner peripheral surface on the back side, so it tends to spread radially and flow into the left-side branch pipe HTL. Therefore, by forming the control guide 17 at the above-mentioned position, the flow into the left-side branch pipe HTL is suppressed (see FIG. 2).

[0044] In other words, if the swirling force of the wastewater is weak, it will flow down to the joint member 20 and the lower connecting member 30, but if the wastewater has a certain degree of swirling force, it will flow down while swirling along the inner surface, and at the location of the left-mouth side branch pipe HTL, the centrifugal force will be large and it will flow into the left-mouth side branch pipe HTL (see Figure 2).

[0045] Therefore, by providing the above-mentioned control guide 17, even if the discharged water has a certain degree of force, the discharged water heading toward the left-mouth side branch pipe HTL can be blocked, and flow into the left-mouth side branch pipe HTL can be prevented (see Figures 2 and 8).

[0046] In addition, since there is no upper swirl vane 16 above the left side branch pipe HTL and there is the control guide 17 as described above, the wastewater from the left side branch pipe HTL merges with the wastewater that has flowed down the inner surface of the guide pipe main body 13 and is guided to the sub-lower swirl vane 32 below, while the wastewater from the central inlet side branch pipe HTC and the right side branch pipe HTR hardly merges with the wastewater that has flowed down the inner surface of the guide pipe main body 13 because there are upper swirl vanes 16 above them, and instead flows directly down the inner surface of the joint member 20.

[0047] The coupling member 20 is a cylindrical body extending in the vertical direction, and is composed of a coupling body 21, to the upper part of which the guide pipe 12 is connected (connected) and to which the lower connecting member 30 is connected at the lower part, and a horizontal branch pipe connector that is provided so as to penetrate and communicate with the front, left side, and right side of the coupling body 21, respectively (see Figures 14 and 16).

[0048] The upper end of the joint body 21 is formed with a slightly larger diameter to form a large-diameter portion 21a that fits (joins) with the outer tube body 14b, and the lower end is formed with a slightly smaller diameter only on the outer circumferential surface to form a thin-walled portion 21c that fits (joins) with the lower connecting member 30 (see Figures 2 and 16).

[0049] The joint body 21 is a size thicker than the guide body 13 as a cylindrical body. For example, when the inside diameter of the guide body 13 is φ100 mm, the inside diameter of the joint member 20 is formed to φ134 mm (see FIG. 2).

[0050] A step portion 21b is formed between the inner circumferential surface of the large diameter portion 21a of the joint body 21 and the inner circumferential surface of the joint body 21, and a triangular protrusion portion 21d is formed on the upper end edge of the large diameter portion 21a, protruding upward from the front surface thereof. When the large diameter portion 21a is fitted (coupled) to the outer tube body 14b to connect the upper connecting member 10 (guide pipe 12) to the joint member 20 (joining body 21), the lower end edge of the outer tube body 14b abuts against the step portion 21b, and the triangular protrusion portion 21d fits into a triangular recess 15a of a protrusion 15 formed on the upper periphery 14a of the outer tube body 14, thereby determining the circumferential position (see FIG. 1).

[0051] A protrusion 23 having a triangular recess 23a for positioning formed therein is integrally formed toward the front, slightly below the central port horizontal branch pipe connector 22C of the fitting body 21 and above the upper edge of the thin-walled portion 21c (see Figures 1 and 14).

[0052] The three horizontal branch pipe connectors 22 are short cylindrical bodies located approximately in the vertical center of the joint body 21 and are connected to the inside of the pipe of the joint body 21 via through holes 21e formed in the joint body 21 (see Figures 16 to 18).

[0053] Each horizontal branch pipe connector 22 has a small diameter base end 22a and a large diameter connection receiving portion 22b extending from the base end 22a to the tip end, and a step portion 22c is formed on the inner circumferential surface thereof (see FIG. 16).

[0054] The peripheral edge of the base end 22a of the horizontal branch pipe connector 22 that communicates with the through hole 21e has an R surface 22d on the underside, so that the wastewater flowing down from the guide pipe 12 and reaching the peripheral edge of the through hole 21e does not flow into the horizontal branch pipe connector 22, but flows down along the inner surface of the fitting body 21 (see Figure 16).

[0055] The inner diameter of the connection receiving portion 22b of the horizontal branch pipe connector 22 is formed to be approximately the same as the outer diameter of the horizontal branch pipe HT, and the inner diameter of the base end portion 22a is formed to be the same as the inner diameter of the horizontal branch pipe HT. When the horizontal branch pipe HT is connected to the horizontal branch pipe connector 22, the front end edge of the horizontal branch pipe HT abuts against the step portion 22c and is connected, so that the inner diameter of the base end portion 22a and the inner diameter of the horizontal branch pipe HT form a continuous surface, and no step is created (see Figure 16).

[0056] Four backflow prevention plates 24 consisting of elongated protrusions are provided on the inner surface of the joint body 21 at equal intervals around the circumference, and are positioned at a central angle of 45 degrees in the front-to-back and left-to-right directions when viewed in a plane (see Figure 3).

[0057] The vertical length of the backflow prevention plate 24 is such that its upper end is at a position approximately the same as the lower edge of the large diameter portion 21a of the fitting body 21 and its lower end is at a position equal to or slightly lower than the lower part of the periphery of the through hole 21e (see Figures 16 and 17).

[0058] The amount of protrusion of the backflow prevention plate 24 from the inner surface of the fitting body 21 is such that the upper half 24a is low and the lower half 24b is high from approximately the center in the vertical direction, and furthermore, the lower half of the lower half 24b becomes lower as it goes downward (see Figure 18).

[0059] In addition, the distance between the two opposing backflow prevention plates 24 in their upper halves 24a, which have a smaller protrusion amount, is formed to be approximately the same as the outer diameter of the above-mentioned guide body 13, and when the large diameter portion 21a of the fitting body 21 is fitted (connected) to the outer tube body 14b of the guide pipe 12, the guide body 13 of the outer tube body 14b is clamped between the upper halves 24a of the four above-mentioned backflow prevention plates 24.

[0060] As a result, at the portion where the joint member 20 and the guide pipe 12 are fitted (coupled), a double-structure tubular body is formed, with the guide body 13 located on the inside and the outer cylinder body 14 and the joint body 21 located on the outside. Then, since the wastewater flows only inside the pipe of the guide body 13 located on the inside, the wastewater is prevented from flowing into the side branch pipe HT connected to the side branch pipe connector 22 on the outside of the joint body 21 (see FIG. 3).

[0061] Furthermore, when the large diameter portion 21a is fitted (connected) to the outer tube main body 14b, the lower edge of the guide main body 13 is positioned at the step between the upper half 24a and the lower half 24b of the backflow prevention plate 24, and in this state, when looking inside the fitting main body 21 from each horizontal branch pipe connector 22, the lower edge of the guide main body 13 is positioned approximately 1 / 3 downward from the vertical upper end of the through hole 21e.

[0062] Specifically, when the inside diameter of the horizontal branch pipe HT is φ77 mm, the lower edge of the guide body 13 is located at a position approximately 15 mm upward from the pipe core of the horizontal branch pipe HT.

[0063] This means that the wastewater flows down within the guide body 13 and does not flow into the upper 1 / 3 of the diameter of the side branch pipe HT, thereby efficiently suppressing backflow of wastewater into the side branch pipe HT.

[0064] Furthermore, as described above, the lower end peripheral edge 13a of the guide body 13 visible from each horizontal branch pipe connecting body 22 is chamfered so that its outer circumferential surface is biased inward, thereby preventing backflow of wastewater into the horizontal branch pipe HT.

[0065] The lower connecting member 30 is a funnel-shaped cylinder whose diameter decreases as it goes downward. Its upper end is formed with a slightly larger diameter to form a large-diameter portion 30a that fits into the thin-walled portion 21c of the joint body 21 of the joint member 20, and its lower end forms a receiver 30b that connects the vertical pipe VT arranged below (see Figure 21).

[0066] Two swirl vanes 31, 32 are provided on the inner peripheral surface of the lower connecting member 30, one of which is the main lower swirl vane 31 with a large blade width and the other is the sub-lower swirl vane 32 with a small blade width, both of which are formed integrally with the lower connecting member 30. For example, if the inner diameter of the upper side of the lower connecting member 30 is φ134 mm and the inner diameter of the lower side is φ100 mm, the width of the main lower swirl vane 31 is approximately 30 mm, and the width of the sub-lower swirl vane 32 is approximately 20 mm (see FIG. 20).

[0067] The main lower swirl vane 31 comprises a semi-arched, plate-like vane body 31a and a base body 31b that rises from the lower connecting member 30 so as to integrally mold the vane body 31a with the lower connecting member 30 (see FIG. 23).

[0068] The main lower swirl vane 31 is provided on the inner circumferential surface on the right rear side of the lower connecting member 30 so that its arc portion is joined to the inner circumferential surface of the lower connecting member 30, its chord portion protrudes toward the center of the lower connecting member 30 and is inclined at approximately 30 degrees from the vertical direction (center line), and the chord portion is shifted 45 degrees in the left-right direction when viewed in a plane (see Figure 23).

[0069] The sub-lower swirl vane 32 is a semi-arch-shaped plate, with its arc portion joined to the inner peripheral surface of the lower connecting member 30 and its chord portion protruding toward the center of the guiding body 13 and inclining at approximately 30 degrees from the vertical direction (center line). Also, the chord portion is formed integrally with the inner peripheral surface on the left diagonal front side of the lower connecting member 30 so that it is offset 45 degrees from the left to right direction when viewed in a plane (see Figure 22).

[0070] Furthermore, the main lower swirl vane 31 and the sub-lower swirl vane 32 are inclined at opposite angles to the vertical. In other words, when viewed from the same direction (45 degrees to the left from the front), the main lower swirl vane 31 is inclined so that its right end is at the top and its left end is at the bottom, and the sub-lower swirl vane 32 is inclined so that its left end is at the top and its right end is at the bottom.

[0071] Therefore, when manufacturing the lower connecting member 30 as a single piece, the die is cut out in one direction, so that one of them (the secondary lower swirl blade 32) can be molded as a plate-shaped blade, while the second (the main lower swirl blade 31) forms the base 31b and a recess is formed on the outer surface of the lower connecting member 30 (see Figure 3).

[0072] In addition, a triangular protrusion 30c protruding upward is formed on the front upper edge of the large diameter portion 30a of the lower connecting member 30, and when the large diameter portion 30a is fitted (coupled) to the thin-walled portion 21c in order to fit (couple) the lower connecting member 30 to the joint member 20, the triangular protrusion 30c fits into the triangular recess 23a of the protrusion 23 formed on the joint body 21, thereby determining the circumferential positioning (see Figure 1).

[0073] The components thus constructed (upper connecting member 10 (receptacle 11, guide pipe 12), joint member 20, lower connecting member 30) are assembled as follows, and the positional relationship of each part is as follows.

[0074] First, the upper part of the guide body 13 of the guide tube 12 is fitted (coupled) to the lower part 11c of the receptacle body 11 to form the upper connecting member 10 (see FIG. 3).

[0075] Next, the large diameter portion 21a of the joint body 21 of the joint member 20 is fitted into the lower portion of the guide body 13 of the upper connecting member 10. At this time, the triangular protrusion 21d of the joint body 21 is fitted into the triangular recess 15a formed in the protrusion 15 of the guide body 13. This allows the upper connecting member 10 and the joint member 20 to be positioned in the circumferential direction (see FIG. 1).

[0076] In this state, the upper blade member 16 is located on the inner surface of the front side of the guide body 13, and the central port side branch pipe HTC is located in front, the left port side branch pipe HTL is located to the left, and the right port side branch pipe HTR is located to the right, so that in a plan view, the upper blade member 16 is located above the through hole 21e that communicates with the central port side branch pipe HTC (see Figures 2 and 3).

[0077] Furthermore, the large diameter portion 30a of the lower connecting member 30 is fitted into the lower part of the joint member 20. At this time, the triangular protrusion 30c of the lower connecting member 30 is fitted into the triangular recess 23a formed in the protrusion 23 of the joint body 21. This determines the circumferential positioning of the joint member 20 and the lower connecting member 30, and determines the circumferential positional relationship between the upper connecting member 10, the joint member 20, and the lower connecting member 30 (see FIG. 1).

[0078] In the drainage pipe joint 1 constructed in this manner, the upper stand pipe VT is connected to the upper part 11a of the receiving body 11 of the upper connecting member 10, and the lower stand pipe VT is connected to the receiving body 30b of the lower connecting member 30, and each horizontal branch pipe HT is further connected to the horizontal branch pipe connector 22 of the joint member 20 (see Figure 1).

[0079] When the standpipe flow from the upper standpipe VT of the drain pipe joint 1 hits the water receiving surface 16a of the upper swirl vane 16 of the upper connecting member 10, a swirling force is imparted to it in a counterclockwise direction when viewed in a plane, causing it to flow downward. Due to the presence of the lower inner surface 13b, much of the flow is guided to the main lower swirl vane 31, where it hits the main lower swirl vane 31 and flows downward with an increased swirling force (see Figure 2).

[0080] Of the vertical pipe flow, the wastewater that does not hit the upper swirl vane 16 flows down with a weak swirling force and is guided along the lower inner circumferential surface 13b to the sub-lower swirl vane 32.

[0081] The drainage water running along the lower inner peripheral surface 13b of the guide body 13, particularly the inner peripheral surface on the back side to which the side branch pipe HT is not connected, hits the control guide 17 and is blocked, preventing it from flowing into the left-side branch pipe HTL. This is because the drainage water running along the inner peripheral surface on the back side generates a radial spreading force as it runs along the lower inner peripheral surface 13b for a long distance, and when it flows down from the lower edge of the guide body 13, it spreads in the radial direction and may flow into the side branch pipe HT, but the control guide 17 can block the drainage water that is about to flow into the left-side branch pipe HTL (see Figure 3). This effect is particularly evident as the drainage volume increases, improving the backflow into the left-side branch pipe HTL and making it possible to have three ports for side branch extraction.

[0082] In addition, the lower edge of the guide body 13 is positioned approximately 15 mm upwardly from the pipe core of the horizontal branch pipe HT, i.e., approximately the upper 1 / 3 of the diameter of the horizontal branch pipe HT is positioned lower than the lower edge of the guide body 13, thereby preventing wastewater from the guide body 13 from flowing into the horizontal branch pipe HT (see Figure 3).

[0083] As described above, in the drain pipe joint 1 of the embodiment, the lower end of the guide body 13 (guide pipe 12) is positioned lower than the upper part of the horizontal branch pipe HT connected to the joint member 20, and the lower end peripheral edge 13a of the guide body 13 (guide pipe 12) is formed so as to be biased downward as it moves from the outer peripheral surface to the inner peripheral surface. Therefore, the drainage flowing down the inner peripheral surface of the guide body 13 (guide pipe 12) does not flow outward at the lower end peripheral edge 13a, i.e., toward the horizontal branch pipe HT, and therefore backflow into the horizontal branch pipe HT can be prevented.

[0084] In addition, the drain pipe joint 1 in the embodiment is composed of three components: an upper connecting member 10, a joint member 20, and a lower connecting member 30. The shapes of the components 10, 20, and 30 are designed to be capable of being integrally molded from resin, so that the drain pipe joint 1 can be made of synthetic resin, and the drain pipe joint 1 can be made lighter.

[0085] Moreover, because the swirl vanes 16, 31, and 32 provided on the drain pipe joint 1 are manufactured as a single piece, they can be made stronger than conventional swirl vanes manufactured as separate parts and attached later. In other words, when vanes formed as separate parts are attached later to a guide pipe or the like, there is a risk that they will fall off or break over time, but the drain pipe joint 1 according to this embodiment can achieve a longer life.

[0086] Furthermore, one upper swirl vane 16 is provided on the upper connecting member 10, and a swirling force is applied to the drainage water by this upper swirl vane 16, which is then guided to the main lower swirl vane 31 of the two lower swirl vanes 31, 32 provided on the lower connecting member 30, where an even stronger swirling force is applied.In addition, much of the drainage water that is not received by the upper swirl vane 16 or the main lower swirl vane 31 is received by the sub-lower swirl vane 32 and given a swirling force, resulting in a drainage pipe joint 1 with high drainage capacity.

[0087] In addition, improving the drainage capacity also contributes to making the drainage pipe joint 1 slimmer and lighter.

[0088] Furthermore, in the drain pipe joint 1 according to the embodiment, by providing the two lower swirl vanes 31, 32 on the funnel-shaped member (lower swirl member 30), it is possible to create an even stronger swirling flow. Making the lower swirl member 30 funnel-shaped means narrowing the aperture as it goes downward, which makes it possible to make the drainage flow crawl along the inner circumferential surface and increase the probability of it hitting the lower swirl vanes 31, 32, thereby increasing the swirling force.

[0089] In the drain pipe joint 1 according to the embodiment, the diameter of the joint member 20 is made large, and the guide body 13 is fitted to form a double-structure tubular body, so that the lower end of the guide body 13 can be positioned so as to cover the horizontal branch pipe HT when viewed from the side, thereby shortening the overall length of the drain pipe joint 1. In the above embodiment, the length of the drain pipe joint 1 can be made approximately 720 mm.

[0090] By increasing the drainage capacity of the drainage pipe joint 1 in this way, it is possible to achieve the high drainage capacity (10.0 liters / second or more) required in high-rise buildings, and it is also possible to connect a horizontal branch pipe HTL to the left outlet, making it possible to realize a three-outlet drainage pipe joint 1.

[0091] Although the embodiment of the present invention has been described above, the specific configuration is not limited to the above embodiment, and even if there are design changes within the scope of the present invention, they are included in the present invention. For example, in the above embodiment, the guide tube is configured from a cylindrical guide body and an outer cylindrical body that covers the guide body, but the present invention can also be applied to a guide tube that does not have an outer cylindrical body and the joint member directly fits the guide body. [Explanation of symbols]

[0092] 1 Drain pipe fitting VT standpipe HT lateral branch canal 10 Upper connecting member 12 Guide tube 13 Guide body (guide tube) 13a Lower edge 14 External cylinder 16 Upper swirl blade 20 Joint members 30 Lower connecting member

Claims

1. A drainage pipe joint comprising an upper connecting member to which a standpipe arranged above is connected, a lower connecting member to which a standpipe arranged below is connected, and a joint member to which a horizontal branch pipe is connected, the upper connecting member being connected to an upper part of the joint member and the lower connecting member being connected to a lower part of the joint member, The lower connecting member is a funnel-shaped cylinder whose diameter decreases downward, A semi-arch shaped main lower swirl vane and a sub-lower swirl vane are provided on an inner peripheral surface of the lower connecting member, Viewed from above, The main lower swirl vane and the sub-lower swirl vane each have a chord portion that is inclined with respect to the center line of the lateral branch pipe. A drainage pipe joint characterized by:

2. A drainage pipe fitting as described in Claim 1, characterized in that the lower end of the chord portion of the main lower swirl vane is joined to the inner surface of the lower connecting member.

3. A drain pipe fitting as described in claim 1 or 2, characterized in that on the inner surface of the lower connecting member, on the back side of the main lower swirl vane, a gradient is formed that slopes away from the center line of the lower connecting member as it goes downward.

4. A drain pipe fitting as described in Claim 3, characterized in that on the inner surface of the lower connecting member, on the back side of the secondary lower swirl vane, a gradient is formed that slopes in a direction approaching the center line of the lower connecting member as it goes downward.

5. The main lower swirl vane is A semi-arch shaped blade body; the base body of the blade is raised from the inner peripheral surface of the lower connecting member; 5. A drainage pipe joint according to claim 1, wherein the base has a triangular surface that is long in the vertical direction when viewed from the center line of the lower connecting member.

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