JP7629752B2 - Drain Pipe Fittings - Google Patents

Description

This invention relates to drainage pipe joints installed in buildings and structures such as apartment buildings, hotels, and office buildings.

Drainage pipe joints are usually installed by embedding them in the floor slab midway through a drainage standpipe 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 configuring them with three members: an upper connecting member to which the standpipe is connected at its upper part, a lower connecting member to which the standpipe is connected at its lower part, and a joint member to which a horizontal branch pipe is connected at the intermediate part between these (Patent Document 1).

Inside this type of drain pipe joint, a swirl vane is provided to give a swirl to the drainage water flowing down, which causes the drainage water to swirl and forms an air core at the center of the swirl to prevent fluctuations in the pressure inside the pipe, thereby improving the drainage capacity.

In addition, by making the inner diameter of the joint member in the middle section larger, the air core will not decrease or disappear even if drainage occurs from the side branch pipe, and high drainage capacity can be expected.

Furthermore, backflow prevention plates extending in the length direction of the joint member can be installed on the inner walls of the pipes located on both sides of the opening of the connecting section of the side branch pipe in the joint member to prevent wastewater from flowing back into the side branch pipe.

This type of drain pipe joint is designed to improve drainage capacity by adjusting the position of the upper and lower blades.

JP 2011-117133 A

However, this type of drainage pipe joint can be molded as a single piece using synthetic resin, making it lightweight and slim, but there are problems with it, such as insufficient drainage capacity and insufficient prevention of backflow into the side branch pipe.

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

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 are concerns 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 increase.

However, with the recent trend toward taller buildings, there is a demand for improved drainage capacity for drainage pipe joints, and there is also a demand for them to be lighter and slimmer as before, so the drainage pipe joint described in Patent Document 1 does not have sufficient capacity.

Therefore, the objective of this invention is to provide a drainage pipe joint that is made of synthetic resin, yet has improved drainage capacity and prevents backflow into the side branch pipe.

In order to solve the above problems, the invention of claim 1 provides 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 arranged in a slab is connected, the upper connecting member being connected to the upper part of the joint member and the lower connecting member being connected to the lower part of the joint member, the upper connecting member being provided with an induction pipe having upper swirl vanes that impart a swirling force to drainage water flowing in the pipe, the lower connecting member being a funnel-shaped cylinder whose diameter decreases as it goes downwards, and the drainage water guided by the upper swirl vanes is guided by the upper swirl vanes. the coupling member is formed to have a diameter one size larger than that of the guide pipe and to fit the guide pipe therein; the lower end of the guide pipe is located lower than an upper part of the side branch pipe connected to the coupling member; the outer circumferential surface of the lower end of the guide pipe is formed to be biased inward as it goes downward ; the inner circumferential surface of the lower part of the guide pipe is formed to have a diameter increasing toward the bottom; and the upper end of the portion formed to be increased in diameter is formed higher than an upper end of a side branch pipe connector provided to the coupling member for connecting the side branch pipe .

The invention of claim 2 is characterized in that, in the drain pipe joint described in claim 1, the upper end of the portion formed to have an expanded diameter is formed lower than the lower end of the upper swirl vane .

According to the present invention, 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.

According to the present invention, the guide pipe may have a double structure of a guide body and an outer cylinder, and the joint member may be fitted to the outer cylinder. In this case, the opening of the side branch pipe connected to the joint member can be separated from the rise pipe flow in the guide pipe, making it possible to further reduce backflow into the side branch pipe.

2 to 23 show an embodiment of the present invention, and this figure is a front view of a drain pipe joint. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. 2 is a cross-sectional view taken along line BB in FIG. 1. 2 is a cross-sectional view taken along line CC of FIG. 1. 2 is a cross-sectional view taken along line DD in FIG. 1. FIG. FIG. FIG. 10 is a cross-sectional view taken along line EE in FIG. 9. 9 is a cross-sectional view taken along line FF in FIG. 8. 9 is a cross-sectional view taken along line GG in FIG. 8. 11 is a cross-sectional view taken along line HH in FIG. 10. FIG. FIG. 16 is a cross-sectional view taken along line II in FIG. 15. 17 is a cross-sectional view taken along line JJ in FIG. 16. 16 is a cross-sectional view taken along line K-K in FIG. 15. 17 is a cross-sectional view taken along line LL in FIG. 16. FIG. 21 is a cross-sectional view taken along line MM in FIG. 20. A cross-sectional view taken along line N-N in Figure 20. 21 is a cross-sectional view taken along line OO in FIG. 20.

The present invention will be described below based on the illustrated embodiment.

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).

The upper connecting member 10, the lower connecting member 30, and the joint member 20 are all made of synthetic resin, and the drainage pipe joint 1 is constructed by connecting these together to form an inner pipe, the outer circumference of which is covered with fiber-mixed mortar. Note that the fiber-mixed mortar layer will be omitted in the following explanation.

Three side branch pipes HT are connected to the drain pipe joint 1 so that it forms an approximately T-shape in plan view (see Figure 2). Figure 1 is a front view, and in Figure 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 Figure 1 (directions on the paper surface of Figure 1) will be explained as the same directions as those in the explanation of the drain pipe joint 1.

The drainage pipe joint 1 according to the embodiment described below is 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, 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.

The upper connecting member 10 consists of a receiving body 11 to which the upper standpipe VT is connected and a guide pipe 12 to which a coupling member 20 is connected (see Figures 1 and 3).

The receptacle 11 is made up of three integrally formed cylinders: an upper section 11a, a middle section 11b, and a lower section 11c. The upper section 11a has a larger diameter than the middle section 11b, and the lower section 11c has a slightly larger diameter than the middle section 11b. The upper section 11a is connected to a standpipe VT, and the lower section 11c is connected to a guide pipe 12. The vertical length of the receptacle 11 is approximately 140 mm.

The inner diameter of the rise pipe VT, the inner diameter of the middle part 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 peripheral surfaces of the rise pipe VT, the receiving body 11, and the guide pipe 12 are continuous, so that no steps are created (see Figure 3).

If the inner diameter of the standpipe VT is slightly larger than the inner diameter of the guide pipe 12, the middle part 11b of the receiving body 11 may be tapered downward. In any case, when the standpipe VT and the guide pipe 12 are connected to the receiving body 11, it is preferable that the inner circumferential surface of the standpipe VT, the inner circumferential surface of the middle part 11b of the receiving body 11, and the inner circumferential surface of the guide pipe 12 are continuous surfaces, so that no steps are created.

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 of the length of the guide body 13. The upper part of the outer cylinder 14 tapers in diameter as it goes upwards and is joined integrally to the guide body 13. The length of the guide tube 12 in the vertical direction is approximately 220 mm (see Figure 10).

The length of the external cylinder 14 is about 1/3 (about 70 mm) of the guide body 13, and is formed at a position about 80 mm downward from the upper edge of the guide body 13, so that the lower edge of the guide body 13 is located below the lower end of the external cylinder 14 (see Figure 10).

The lower edge 13a of the guide body 13 is chamfered so that the outer circumferential surface is biased inward as it goes downward, and the inner circumferential surface is formed as a nearly straight surface, and in reality, due to die cutting, 13b is slightly enlarged in diameter as it goes downward (see Figures 3 and 10).

The wastewater that flows down along the inner circumferential surface of the guide body 13 does not flow outward at the lower end periphery 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 periphery 13a of the guide body 13 is not limited to being chamfered, and may be formed into a rounded surface.

Moreover, as described above, the guide pipe 12 is composed of a cylindrical guide body 13 and an outer cylinder body 14 that covers the guide body 13. By fitting the joint member 20 to the outer cylinder body 14, the opening end face of the side branch pipe HT connected to the joint member 20 can be separated from the inner surface of the guide body 13 through which the vertical pipe flow flows, and backflow into the side branch pipe HT can be further prevented.

The upper outer periphery 14a of the outer cylinder 14 is made thicker than the outer cylinder body 14b below it, and a step is formed between it and the outer cylinder body 14b (see Figure 10).

A protrusion 15 with 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 Figures 1 and 7). The side of the drain pipe joint 1 with this protrusion 15 is the front.

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

The upper swirling blade 16 is a semi-arch-shaped plate, with the arc portion joined to the inner peripheral surface of the induction body 13 and the chord portion formed integrally with the inner peripheral surface of the front side (near side) of the induction body 13 so that it protrudes 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).

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 it about 1/3 of the inner diameter of the induction body 13. For example, if the inner diameter of the induction 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.

The upper swirl vane 16 is formed such that its upper end is approximately 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 approximately 180 mm. The upper swirl vane 16 is also 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 40 mm above the lower edge of the induction body 13, and the lower inner surface 13b of the inner circumferential surface of the induction body 13 within a range of 40 mm below the upper swirl vane 16 is a straight cylinder portion except for the control guide 17.

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

In other words, the position where the lower end of the upper swirl vane 16 is offset 40 mm above the lower edge of the guide body 13 is a height where the wastewater that hits 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.

The control guide 17 is a vertically long protrusion that protrudes 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 pipe core as the center in a plan view. It has a vertical length 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 to contact the lower edge of the guide body 13 (see Figure 8).

The control guide 17 has a flat trapezoidal shape when viewed from the side (circumferential direction), with the upper 1/3 and lower 1/3 of the length being inclined surfaces and the center being flat (see Figure 11).

The control guide 17 is formed at a central angle of 40 degrees counterclockwise from the front-to-rear direction with the pipe core as the center in a plan view, that is, at a central angle of approximately 220 degrees counterclockwise from the center of the upper swirl vane 16 (see Figures 4 and 8).

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

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 left-side branch pipe HTL, the centrifugal force will be large and it will flow into the left-side branch pipe HTL (see Figure 2).

Therefore, by providing the control guide 17, even if the discharged water has a certain amount 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).

In addition, because there is no upper swirl vane 16 above the left side branch pipe HTL and because there is a control guide 17 as described above, the drainage water from the left side branch pipe HTL merges with the drainage water flowing down the inner surface of the guide pipe main body 13 and is guided to the sub-lower swirl vane 32 below, while the drainage water from the central mouth side branch pipe HTC and the right side branch pipe HTR hardly merges with the drainage water flowing down the inner surface of the guide pipe main body 13 because there is an upper swirl vane 16 above them, and instead flows down the inner surface of the joint member 20 as it is.

The joint member 20 is a vertically extending cylindrical body, and is composed of a joint body 21 to which the guide pipe 12 is connected at the top and a lower connecting member 30 is connected at the bottom, and a horizontal branch pipe connector that is provided to penetrate and communicate with the front, left side, and right side of the joint body 21 (see Figures 14 and 16).

The upper end of the joint body 21 is formed with a slightly larger diameter, forming a large diameter section 21a that fits (connects) to the outer tube body 14b, and the lower end is formed with a slightly smaller diameter only on the outer periphery, forming a thin-walled section 21c that fits (connects) to the lower connecting member 30 (see Figures 2 and 16).

The joint body 21 is a size thicker than the guide body 13 as a cylindrical body. For example, if the inner diameter of the guide body 13 is φ100 mm, the inner diameter of the joint member 20 is formed to φ134 mm (see Figure 2).

A step 21b is formed between the inner peripheral surface of the large diameter portion 21a of the joint body 21 and the inner peripheral surface of the joint body 21, and a triangular protrusion 21d is formed on the upper edge of the large diameter portion 21a, which protrudes upward from its front surface. 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 edge of the outer tube body 14b abuts against the step 21b, and the triangular protrusion 21d fits into the triangular recess 15a of the protrusion 15 formed on the upper periphery 14a of the outer tube body 14, thereby positioning the joint in the circumferential direction (see FIG. 1).

A protrusion 23 with a triangular recess 23a for positioning is formed on the upper edge of the thin-walled portion 21c of the joint body 21, slightly below the central port horizontal branch pipe connector 22C, and is integrally provided toward the front (see Figures 1 and 14).

The three horizontal branch pipe connectors 22 are short, cylindrical bodies located approximately in the vertical center of the joint body 21 and communicate with 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).

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 (see FIG. 16).

The periphery of the base end 22a of the horizontal branch pipe connector 22 that communicates with the through hole 21e is formed with an R surface 22d on the underside, so that the wastewater that flows down from the guide pipe 12 and reaches the periphery of the through hole 21e does not flow into the horizontal branch pipe connector 22, but flows down along the inner circumferential surface of the fitting body 21 (see Figure 16).

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

Four backflow prevention plates 24 consisting of vertically long protrusions are provided on the inner peripheral surface of the joint body 21 at equal intervals in the circumferential direction, and are positioned at a central angle of 45 degrees in the front-rear and left-right directions when viewed from above (see Figure 3).

The vertical length of the backflow prevention plate 24 is such that its upper end is at a position almost the same as the lower edge of the large diameter portion 21a of the joint body 21, and its lower end is at a position at the same level as the lower edge of the through hole 21e or slightly lower (see Figures 16 and 17).

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

The distance between the two opposing backflow prevention plates 24 is approximately the same as the outer diameter of the guide body 13 in the upper half 24a, which has a smaller protrusion amount, and when the large diameter portion 21a of the joint body 21 is fitted (coupled) 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 backflow prevention plates 24.

As a result, at the portion where the joint member 20 and the guide pipe 12 are fitted (connected), 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, the wastewater flows only through the pipe of the guide body 13 located on the inside, so that 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 Figure 3).

When the large diameter portion 21a is fitted (coupled) to the outer tube body 14b, the lower edge of the guide 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 the inside of the joint body 21 is viewed from each horizontal branch pipe connector 22, the lower edge of the guide body 13 is located approximately 1/3 downward from the upper end of the through hole 21e in the vertical direction.

Specifically, when the inside diameter of the side branch pipe HT is φ77 mm, the lower edge of the guide body 13 is positioned approximately 15 mm above the pipe core of the side branch pipe HT.

This means that the wastewater flows down inside the guide body 13 and does not flow into the upper 1/3 of the diameter of the side branch pipe HT, effectively preventing backflow of wastewater into the side branch pipe HT.

Moreover, as described above, the lower end peripheral edge 13a of the guide body 13 visible from each horizontal branch pipe connector 22 is chamfered so that its outer circumferential surface is biased inward, which prevents backflow of wastewater into the horizontal branch pipe HT.

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

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 larger blade width, and the other is the sub-lower swirl vane 32 with a smaller blade width, both of which are formed integrally with the lower connecting member 30. For example, if the upper inner diameter of the lower connecting member 30 is φ134 mm and the lower inner diameter is φ100 mm, the main lower swirl vane 31 is formed to have a width of approximately 30 mm, and the sub-lower swirl vane 32 is formed to have a width of approximately 20 mm (see FIG. 20).

The main lower swirl vane 31 consists of a semi-arched, plate-like vane body 31a and a base body 31b that is raised from the lower connecting member 30 in order to mold the vane body 31a integrally with the lower connecting member 30 (see Figure 23).

The main lower swirl vane 31 is attached to the inner peripheral surface of the lower connecting member 30 at its arc portion, with its chord portion protruding toward the center of the lower connecting member 30 and tilting at approximately 30 degrees from the vertical direction (center line). It is also attached to the inner peripheral surface of the lower connecting member 30 on the right rear side so that the chord portion is offset 45 degrees from left to right in a plan view (see Figure 23).

The sub-lower swirl vane 32 is a semi-arch-shaped plate with an arc portion joined to the inner peripheral surface of the lower connecting member 30, a chord portion protruding toward the center of the induction body 13 and inclined at approximately 30 degrees from the vertical direction (center line), and is integrally formed with the inner peripheral surface on the left diagonal front side of the lower connecting member 30 so that the chord portion is offset 45 degrees from the left to right in a plan view (see Figure 22).

The main lower swirl vane 31 and the sub-lower swirl vane 32 are inclined at opposite angles to the vertical; that is, 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.

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

In addition, a triangular protrusion 30c is formed on the upper edge of the large diameter portion 30a of the lower connecting member 30, protruding upward from its front surface. 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 positioning it in the circumferential direction (see FIG. 1).

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 relative positions of each part are as follows:

First, the upper connecting member 10 is formed by fitting (connecting) the upper part of the guide body 13 of the guide tube 12 to the lower part 11c of the receptacle 11 (see Figure 3).

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 Figure 1).

In this state, the upper blade member 16 is located on the inner peripheral surface of the front side of the induction 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 and the central port side branch pipe HTC are located above the through hole 21e that communicates with them (see Figures 2 and 3).

The large diameter portion 30a of the lower connecting member 30 is then fitted to the lower portion of the joint member 20. At this time, the triangular recess 23a formed in the protrusion 23 of the joint body 21 is fitted to the triangular protrusion 30c of the lower connecting member 30. This positions the joint member 20 and the lower connecting member 30 in the circumferential direction, and determines the positional relationship between the upper connecting member 10, the joint member 20, and the lower connecting member 30 in the circumferential direction (see FIG. 1).

In the drainage pipe joint 1 thus constructed, the upper standpipe VT is connected to the upper part 11a of the receiving body 11 of the upper connecting member 10, and the lower standpipe VT is connected to the receiving body 30b of the lower connecting member 30, and each side branch pipe HT is further connected to the side branch pipe connector 22 of the joint member 20 (see Figure 1).

When the standpipe flow from the upper standpipe VT of the drainage pipe joint 1 hits the water receiving surface 16a of the upper swirl vane 16 of the upper connecting member 10, a counterclockwise swirling force is applied to it in a plan view, causing it to flow downward. Due to the presence of the lower inner circumferential 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).

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.

When wastewater runs along the lower inner circumferential surface 13b of the guide body 13, particularly the inner circumferential surface on the back side to which the side branch pipe HT is not connected, it hits the control guide 17 and its flow is blocked, preventing it from flowing into the left-mouth side branch pipe HTL. This is because the wastewater running along the inner circumferential surface on the back side generates a radial spreading force as it runs along the lower inner circumferential surface 13b for a long distance, and as 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 wastewater that is about to flow into the left-mouth side branch pipe HTL (see Figure 3). This effect is particularly evident as the amount of wastewater increases, improving the backflow into the left-mouth side branch pipe HTL and making it possible to have three ports for side branch extraction.

The lower edge of the guide body 13 is offset approximately 15 mm upward 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 located below the lower edge of the guide body 13, preventing wastewater from the guide body 13 from flowing into the horizontal branch pipe HT (see Figure 3).

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

The drain pipe joint 1 according to the embodiment is composed of three members: an upper connecting member 10, a joint member 20, and a lower connecting member 30. The shapes of the members 10, 20, and 30 are designed to be molded integrally from resin, so that the drain pipe joint 1 can be made of synthetic resin, and the weight of the drain pipe joint 1 can be reduced.

In addition, the swirl vanes 16, 31, and 32 provided on the drain pipe joint 1 are manufactured as a single piece, which makes them stronger than conventional swirl vanes manufactured as separate parts and then 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 of this embodiment can achieve a longer life.

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, most of the drainage water that is not received by the upper swirl vane 16 and cannot be received by 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.

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

In addition, in the drain pipe joint 1 according to the embodiment, by providing 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 the drain flow crawl along the inner circumferential surface, increasing the probability of it hitting the lower swirl vanes 31, 32, and increasing the swirling force.

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 that it covers 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.

By increasing the drainage capacity of the drain pipe joint 1 in this way, it is possible to achieve the high drainage capacity (10.0 liters/second or more) required for 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 drain pipe joint 1.

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 gist of the present invention, they are included in the present invention. For example, in the above embodiment, the guide tube is described as being composed of 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 over the guide body.

1. Drain pipe joint
VT Standpipe HT Horizontal branch pipe 10 Upper connecting member 12 Guide pipe 13 Guide body (Guide pipe)
13a: Lower end periphery 14: External cylinder body 16: Upper swirl vane 20: Joint member 30: Lower connecting member

Claims (2)

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 arranged in a slab 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 upper connecting member includes a guide pipe having an upper swirl vane that imparts a swirling force to the wastewater flowing inside the pipe,
The lower connecting member is a funnel-shaped cylinder whose diameter decreases as it goes downward, and is provided with a lower swirl vane that mainly receives the wastewater guided to the upper swirl vane and further imparts a swirling force;
The coupling member is formed to have a diameter one size larger than that of the guide pipe, and the guide pipe is fitted inside the coupling member,
A lower end of the guide pipe is positioned below an upper portion of the lateral branch pipe connected to the joint member ,
The outer circumferential surface of the lower end of the guide pipe is formed to be biased inwardly downward , and the inner circumferential surface of the lower portion of the guide pipe is formed to be expanded in diameter downward,
The upper end of the portion formed to expand in diameter is formed above an upper end of a side branch pipe connector provided on the joint member for connecting the side branch pipe.
A drainage pipe joint characterized by: The upper end of the portion formed to expand in diameter is formed below the lower end of the upper swirl vane.
2. A drain pipe joint as claimed in claim 1.

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