JP2019190239A - Fitting and drainage system - Google Patents

Abstract

To provide smooth connection of tubes, regardless of the cross-sectional view shape of the flow path forming portions of the tubes.SOLUTION: The present invention provides is a fitting for drainage pipes. Of the inner peripheral surface 20b, a flow path forming portion 20c that forms the pipe inner face of a drainage pipe changes from a perfect circular shape to an oval shape from the first side to the second side in the direction of the pipe axis of the drainage pipe, in a cross-sectional view orthogonal to the pipe axis of the drainage pipe.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a joint and a drainage system.

  Conventionally, for example, a drain pipe described in Patent Document 1 below is known.

Japanese Patent Laying-Open No. 2015-68139

However, the conventional drain pipe has room to improve clogging of filth.
Therefore, the inventor of the present application has come up with an egg-shaped cross-sectional view of the inner peripheral surface of the pipe constituting the drain pipe. In this case, the pipe (drainage pipe) can be arranged so that the egg-shaped tapered portion is located at the pipe bottom. As a result, for example, the water level can be increased even when the same amount of drainage is discharged, compared to the case where a pipe having a circular shape in cross section on the inner peripheral surface is employed. , Sewage clogging can be suppressed.
By the way, also in the drain pipe which employ | adopts such an egg-shaped pipe | tube, the pipe | tube whose cross-sectional view shape of an internal peripheral surface makes a perfect circle shape may be employ | adopted partially. In such a drainage pipe, it is necessary to connect pipes having different cross-sectional shapes in a perfect circle shape and an egg shape or pipes having a cross-sectional view shape in an egg shape by a joint.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to facilitate smooth connection between tubes regardless of the cross-sectional view shape of the flow path forming portion of the tube.

In order to solve the above problems, the present invention proposes the following means.
In the joint for drainage pipes according to the present invention, the flow path forming part that forms the pipe inner surface of the drainage pipe among the inner peripheral surfaces is the drainage in a cross-sectional view orthogonal to the pipe axis of the drainage pipe. The shape changes from a perfect circle shape to an egg shape from the first side to the second side in the tube axis direction of the tube.

In this case, the flow path forming portion changes from a perfect circle shape to an egg shape from the first side to the second side in the tube axis direction. Therefore, when connecting the first pipe on the upstream side and the second pipe on the downstream side with this joint, the cross-sectional shape of the flow path forming portion of the first pipe and the flow of the second pipe are connected. The first tube and the second tube can be smoothly connected easily regardless of the cross-sectional view shape of the path forming portion.
For example, when the flow path forming portion of the first pipe has a perfect circle shape and the flow path forming portion of the second pipe has an oval shape, the first side of the joint faces the upstream side, and the second side Is directed downstream. Thereby, the flow path connecting the first pipe and the second pipe can be gradually changed from a perfect circle shape to an egg shape from the upstream side toward the downstream side.
Further, for example, when both the flow path forming portion of the first pipe and the flow path forming portion of the second pipe are egg-shaped, the perfect circular flow path cross-sectional area formed by the joint is The first side of the joint is directed upstream and the second side is directed downstream with respect to the egg-shaped flow path cross-sectional area formed by one tube. Thereby, in the connection part of a joint and a 1st pipe | tube, the flow-path cross-sectional area of a joint can be made larger than the flow-path cross-sectional area of a 1st pipe | tube. Moreover, in the connection part of a joint and a 2nd pipe | tube, the flow-path cross-sectional area of a joint and the flow-path cross-sectional area of a 2nd pipe | tube can be made equivalent. Therefore, the flow path connecting the first pipe and the second pipe can be gradually decreased from the upstream side toward the downstream side without being rapidly narrowed with respect to the first pipe.

  The outer peripheral surface may have a perfect circle shape over the entire length in the tube axis direction.

  In this case, the outer peripheral surface of the joint has a perfect circle shape over the entire length in the tube axis direction. Therefore, it can be constructed in the same manner as a general component (drainage pipe).

  The drainage system according to the present invention includes a water-saving toilet and a drain pipe provided with the joint, and the drain pipe discharges drainage from the water-saving toilet.

  In this case, the drain pipe discharges drainage from a water-saving toilet (for example, water-saving type I or water-saving type II of a water-saving toilet defined in JIS A 5207: 2011) that has a small amount of drainage and is likely to be clogged. Therefore, the effect that the clogging of filth as described above can be suppressed can be remarkably achieved.

  According to the present invention, clogging of filth can be improved.

It is a perspective view which shows the drain pipe which concerns on one Embodiment of this invention. It is a side view of a part of the drain pipe shown in FIG. It is a perspective view of the 1st coupling and 1st horizontal pipe which comprise the drainage pipe shown in FIG. It is the longitudinal cross-sectional view of the 1st joint and 1st horizontal pipe which are shown in FIG. 3, Comprising: It is the longitudinal cross-sectional view which cut | disconnected the 1st joint and the 1st horizontal pipe along the vertical surface. It is a top view of the 1st coupling which comprises the drainage pipe shown in FIG. It is a front view of the 1st coupling shown in FIG. It is a perspective view of the horizontal pipe which comprises the drain pipe shown in FIG. It is a front view of the horizontal pipe shown in FIG. It is the perspective view which looked at the 4th coupling which constitutes the 1st horizontal pipe shown in Drawing 3 from the downstream. It is the perspective view which looked at the 4th joint shown in Drawing 9 from the upper stream side. FIG. 4 is a longitudinal sectional view of main parts of the first joint and the first horizontal pipe shown in FIG. 3, and is a longitudinal sectional view of the first joint and the first horizontal pipe cut along a horizontal plane. It is a perspective view of the 2nd coupling which comprises the drainage pipe shown in FIG. It is the front view which looked at the 2nd joint shown in Drawing 12 from the upper stream side. It is the front view which looked at the 2nd joint shown in Drawing 12 from the downstream. It is the section perspective view which looked at the 5th joint which constitutes the drain pipe concerning the modification of the present invention from the upper stream side. It is the cross-sectional perspective view which looked at the 5th joint shown in FIG. 15 from the downstream. It is a side view of the 1st joint which constitutes the drain pipe concerning the modification of the present invention. It is a top view of the 1st example of the 2nd joint which constitutes the drain pipe concerning the modification of the present invention. It is a top view of the 2nd example of the 2nd joint which constitutes the drain pipe concerning the modification of the present invention.

Hereinafter, a drain pipe 10 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 14.
As shown in FIG. 1, the drain pipe 10 is used in, for example, a residential drainage system that processes residential drainage. The drain pipe 10 is disposed, for example, under a floor or a wall of a building constructed in a residential land, and drainage discharged from the drainage facility 1 in the building circulates. In this embodiment, the sewage from the drainage facility 1 is drained to the drainage header 2. The drainage discharged to the drainage header 2 is discharged, for example, to a sewer main (not shown) through a drainage mass (not shown) arranged in a residential land of a building or a public mass (not shown) arranged outside the residential land. The drain pipe 10 is not limited to the configuration in which the drainage from the drainage facility 1 is discharged to the drainage header 2. For example, the drain pipe 10 may drain the drainage from the drainage facility 1 into a pipe structure (so-called basic through pipe) configured with a sheath pipe penetrating the foundation and a drain pipe disposed inside the sheath pipe. Furthermore, when the drain pipe 10 is installed on the second floor, the drain pipe 10 discharges the drainage from the drainage facility 1 to a joint for connecting the sewage to the vertical pipe that conveys the sewage to the lower floor. Also good.

  In the present embodiment, a water-saving toilet 3 as the drainage facility 1 is provided in the building, and the drain pipe 10 discharges the waste water from the water-saving toilet 3. The water-saving toilet 3 is, for example, a water-saving toilet defined in JIS A 5207: 2011, and a water-saving I-type toilet with a wash water volume of 8.5 L or less, or a water-saving toilet with a wash water volume of 6.5 L or less. Type II toilet bowl and the like can be mentioned. As a water-saving type II toilet bowl, a toilet bowl with a wash water volume of 4.8 L or less is preferable, and a toilet bowl with a wash water volume of 3.8 L or less is more preferable. The drain pipe 10 is not limited to the configuration that discharges the drainage from the water-saving toilet 3. For example, the drain pipe 10 may discharge the drainage from the drainage facility 1 different from the water-saving toilet 3. Examples of the drainage facility 1 different from the water-saving toilet 3 include a bathtub, a washing machine, a washroom, a sink, and a non-water-saving toilet.

The drain pipe 10 includes a vertical pipe 11, a first joint 12, a first horizontal pipe 13, a second joint 14, and a second horizontal pipe 15.
The vertical tube 11 extends in the vertical direction Z. The vertical tube 11 extends downward from the water-saving toilet 3. A first joint 12 is provided at the lower end of the vertical tube 11.
The first joint 12 connects the vertical tube 11 and the first horizontal tube 13. The first joint 12 is a so-called elbow and is formed in an L shape. As shown in FIG. 2, the first joint 12 includes a joint body 12a, an upstream receiving port 12b, and a downstream receiving port 12c. The upstream receiving port 12b faces upward, and the vertical tube 11 is fitted in the upstream receiving port 12b. The downstream receiving port 12c faces the horizontal direction, and the first horizontal tube 13 is fitted into the downstream receiving port 12c. The inner peripheral surface of each receptacle 12b, 12c and the outer peripheral surface of the vertical tube 11 and the outer peripheral surface of the first horizontal tube 13 are fixed with an adhesive or the like. In addition, when each receiving port 12b and 12c is transparent, for example, the adhesion condition by the said adhesive agent is visually recognized from the outside, or the vertical tube 11 or the first horizontal tube 13 is inserted into each receiving port 12b and 12c to a proper position. It is possible to visually check whether it is inserted.
The angle formed by the central axis of the upstream receiving port 12b of the first joint 12 and the central axis of the downstream receiving port 12c is larger than 90 ° so that the first horizontal pipe 13 has a drainage gradient described later, and is 91 ° or more. It is preferable that

As shown in FIG. 1, the first horizontal tube 13 extends in the horizontal direction. The first horizontal pipe 13 is provided with a drainage gradient that descends from the upstream side toward the downstream side. A second joint 14 is provided at the downstream end of the first horizontal pipe 13.
The second joint 14 connects the first horizontal tube 13 and the second horizontal tube 15. The second joint 14 is a so-called elbow and is formed in an L shape. As shown in FIG. 12, the second joint 14 includes a joint body 14a, an upstream receiving port 14b, and a downstream receiving port 14c. Both the upstream receiving port 14b and the downstream receiving port 14c face the horizontal direction. The first horizontal tube 13 is fitted in the upstream receiving port 14b, and the second horizontal tube 15 is fitted in the downstream receiving port 14c. The inner peripheral surface of each receptacle 14b, 14c and the outer peripheral surface of the first horizontal tube 13 and the outer peripheral surface of the second horizontal tube 15 are fixed with an adhesive or the like.

As shown in FIG. 1, the second horizontal pipe 15 extends in the horizontal direction like the first horizontal pipe 13, and has a drainage gradient that descends from the upstream side toward the downstream side. The downstream end of the second horizontal pipe 15 is connected to the drainage header 2.
The drainage gradient of the first horizontal pipe 13 and the second horizontal pipe 15 is at least a gradient (1/100) that goes down 1 cm in the height direction when the horizontal length is 100 cm, and a gradient of 1/100 or more. Is preferable, and a gradient of 2/100 or more is more preferable. On the other hand, it is preferable that the drainage gradient is 5/100 or less in order to improve the fit under the floor of the horizontal pipes 13 and 15 and to transport the filth together with the sewage. In addition, it is preferable that the drainage gradient of the 2nd horizontal pipe 15 is more than the drainage gradient of the 1st horizontal pipe 13 (for example, 2/100 or more). The drainage gradient of the second horizontal pipe 15 can be adjusted by, for example, the angle of the second joint 14.
The total length of the drain pipe 10 from the first joint 12 to the drain header 2 is, for example, 4 m or less, and more preferably 3 m or less.

As shown in FIGS. 3 and 4, the first horizontal pipe 13 according to this embodiment includes two divided pipes 81 and 82, and a third joint 83 and a fourth joint that connect the two divided pipes 81 and 82. 91 (not shown in FIG. 1).
The dividing pipes 81 and 82 include a first dividing pipe 81 located on the upstream side and a second dividing pipe 82 located on the downstream side. The third joint 83 is attached to the first split pipe 81. The fourth joint 91 is attached to the second split pipe 82. The third joint 83 and the fourth joint 91 are attached to each other.

As shown in FIG. 4, the third joint 83 is a so-called socket and is formed in a straight line shape. The third joint 83 includes a pipe portion 84 and a flange portion 85.
In the pipe part 84, the division pipes 81 and 82 can be fitted. The flange portion 85 is disposed in the central portion of the tube portion 84 in the axial direction. The flange portion 85 protrudes from the inner peripheral surface of the tube portion 84. The flange portion 85 is formed in an annular shape that continuously extends over the entire circumference of the inner peripheral surface of the tube portion 84.

  In the third joint 83, a portion of the pipe portion 84 located on the upstream side of the flange portion 85 constitutes the upstream receiving port 83 b, and a portion located on the downstream side of the flange portion 85 constitutes the downstream receiving port 83 c. Further, the remaining portion of the pipe portion 84 and the flange portion 85 constitute a joint body 83a. Both the upstream receiving port 83b and the downstream receiving port 83c face the horizontal direction. A first divided pipe 81 is fitted into the upstream receiving port 83b, and a second divided pipe 82 is fitted into the downstream receiving port 83c. The inner peripheral surface of each receiving port 83b, 83c and the outer peripheral surface of the first divided tube 81 and the outer peripheral surface of the second divided tube 82 are fixed with an adhesive or the like.

  The fourth joint 91 is a so-called one-piece socket (or one-piece socket) and is formed in a straight line. The fourth joint 91 is disposed between the third joint 83 and the second split pipe 82. The fourth joint 91 includes an insertion port 92 and a receiving port 93. When the fourth joint 91 is viewed from the vertical direction Z, the center axis of the insertion port 92 and the receiving port 93 is parallel to form the fourth joint 91 in a straight line. The fourth joint 91 is not limited to a linear shape. For example, when the fourth joint 91 is viewed from the vertical direction Z, the angle formed between the insertion port 92 and the central axis of the receiving port 93 may be 90 degrees or 135 degrees.

  The insertion port 92 is located on the upstream side of the receiving port 93. The insertion opening 92 has a smaller diameter than the receiving opening 93. The inner peripheral surface of the insertion port 92 and the inner peripheral surface of the receiving port 93 are connected via a stepped portion 94 that faces the downstream side. The insertion port 92 is fitted into the downstream receiving port 83 c of the third joint 83. The outer peripheral surface of the insertion port 92 and the inner peripheral surface of the downstream receiving port 83c of the third joint 83 are fixed with an adhesive or the like. A second split pipe 82 is fitted in the receiving port 93. When the end of the second divided pipe 82 abuts against the stepped portion 94, further fitting of the second divided pipe 82 into the fourth joint 91 (inside the receiving port 93) (advance in the pipe axis direction) is restricted. Is done. The inner peripheral surface of the receiving port 93 and the outer peripheral surface of the second divided pipe 82 are fixed with an adhesive or the like.

  As shown in FIG. 1, the vertical pipe 11, the first joint 12, the first horizontal pipe 13 (divided pipes 81 and 82, the third joint 83, the fourth joint 91), the second joint 14, and the second horizontal pipe. Reference numeral 15 denotes a member constituting the drain pipe 10 (constituting member 20 for drain pipe, hereinafter referred to as “constituting member 20”). All the component members 20 are formed in a tubular shape, and the central axis of each component member 20 coincides with the tube axis of the drain pipe 10. In the following, the direction along the tube axis (the central axis of each component member 20) is referred to as the tube axis direction, the direction orthogonal to the tube axis is referred to as the radial direction, and the direction around the tube axis is referred to as the circumferential direction.

  After the drainage pipe 10 constituted by each constituent member 20 extends downward from the water-saving toilet 3 (vertical pipe 11), the direction of the drainage pipe 10 is changed by the first joint 12 to the first direction in the horizontal direction. The second joint 14 extends in the first direction until the direction is further changed (first lateral tube 13). The direction of the drainage pipe 10 is changed by the second joint 14 from the first direction to the second direction, which is a horizontal direction different from the first direction, and extends in the second direction (second horizontal pipe 15). After that, the drainage header 2 is reached.

  As shown in FIGS. 5 to 14, the outer peripheral surface 10 a of the drain pipe 10 is formed by the outer peripheral surface 20 a of each component member 20, and the pipe inner surface 10 b (surface forming the flow path) of the drain pipe 10 is It is formed by the inner peripheral surface 20 b of the component member 20. As shown in FIGS. 7 and 8, among the constituent members 20, the inner peripheral surfaces of the vertical pipe 11, the divided pipes 81 and 82, and the second horizontal pipe 15 extend over the entire length in the pipe axis direction of the drain pipe 10. A flow path forming portion 20c that forms the pipe inner surface 10b is formed. As shown in FIGS. 5, 6, and 12 to 14, among the constituent members 20, joints 12, 14, and 83 excluding the fourth joint 91 (first joint 12, second joint 14, and third joint 83). Then, only the inner peripheral surface of each joint main body 12a, 14a, 83a is a flow path forming part 20c, and each receiving port 12b, 12c, 14b, 14c, 83b, 83c is not the flow path forming part 20c. . As shown in FIGS. 9 and 10, in the fourth joint 91, the inner peripheral surface of the insertion port 92 is the flow path forming portion 20 c, and the receiving port 93 is not the flow path forming portion 20 c.

As shown in FIG. 1, the outer peripheral surface 10 a of the drain pipe 10 is formed in a perfect circle shape over the entire length in the pipe axis direction in a cross-sectional view orthogonal to the pipe axis. A support fitting (not shown) is attached to the outer peripheral surface 10a of the drain pipe 10, and the drain pipe 10 is supported by the support fitting. When the outer peripheral surface 10a of the drain pipe 10 has a perfect circle shape, for example, a general-purpose product can be used as the support fitting.
On the other hand, as shown in FIGS. 5 to 14, at least a part of the inner surface 10 b of the drain pipe 10 is formed in an egg shape in the cross-sectional view. In the illustrated example, a horizontal portion of the drain pipe 10 extending in the horizontal direction as shown in FIGS. 6 to 14 (a part of the first joint 12, the first lateral pipe 13, the second joint 14, and the second lateral pipe). Most of the pipe inner surface 10b, except for a part of the portion formed by 15), is egg-shaped. Of the drain pipe 10, a pipe inner surface 10b of a part of the horizontal part and a vertical part extending in the vertical direction Z (part formed by the vertical pipe 11 and the other part of the first joint 12) It is a perfect circle shape.

  As shown in FIGS. 6, 8, and 14, the above-described egg shape (inverted egg shape) is formed symmetrically in the width direction W perpendicular to the vertical direction Z in the cross-sectional view. The egg shape gradually narrows in the width direction W and then gradually narrows from the top to the bottom. The egg-shaped maximum width portion is located above the center of the egg-shaped vertical direction Z. The egg shape is convex downward as a whole.

  The egg-shaped periphery is smoothly connected without any step over the entire circumference. The egg-shaped peripheral edge is formed by a plurality of curvature lines that protrude outward in the radial direction (from the inside of the egg shape to the outside). In the example shown in the figure, the egg-shaped peripheral edges are arranged on the first curvature line 31 located on the upper side, the second curvature line 32 located on the lower side, and a pair of first curvature lines 31 and second arranged on both sides in the width direction W. And a third curvature line 33 connecting the curvature line 32. Among these, for example, the curvature of the second curvature line 32 can be, for example, R15 to R21.5 or R21.5 to R35.

  As shown in FIGS. 5 to 14, the outer peripheral surface 20 a of each component member 20 constituting the drain pipe 10 has a perfect circle shape over the entire length in the pipe axis direction in the cross-sectional view. On the other hand, the inner peripheral surface 20b of the component member 20 is the egg in the cross-sectional view of the most part of the pipe inner surface 10b of the drain pipe 10 that forms the horizontal portion as shown in FIGS. The other portions as shown in FIGS. 5 and 13 have a perfect circle shape in the cross-sectional view.

  Specifically, as shown in FIGS. 7 and 8, the inner peripheral surfaces of the divided pipes 81 and 82 and the second horizontal pipe 15 are egg-shaped over the entire length in the pipe axis direction. On the other hand, the inner peripheral surface of the vertical tube 11 has a perfect circle shape over the entire length in the tube axis direction. Further, as shown in FIGS. 5 and 6, on the inner peripheral surface of the joint body 12a of the first joint 12, the upstream end is a perfect circle shape, the downstream end is an egg shape, and both end portions In the intermediate portion located between the two, the shape gradually changes from a perfect circle shape to an egg shape from the upstream side to the downstream side. The first joint 12 is a conversion joint that converts the shape of the pipe inner surface 10 b of the drain pipe 10.

  Moreover, as shown in FIG. 11, the inner peripheral surface of the joint main body 83a in the third joint 83 is formed in a perfect circle shape in the cross sectional view. In the cross sectional view, the perfect circular channel cross-sectional area formed by the third joint 83 is larger than the egg-shaped channel cross-sectional area formed by each of the divided pipes 81 and 82, and the inner peripheral surface of the third joint 83 is It is located on the inner peripheral surface of the divided pipes 81 and 82 or on the outer side in the radial direction from the inner peripheral surface of the divided pipes 81 and 82.

  As shown in FIGS. 9 and 10, the inner peripheral surface of the insertion opening 92 of the fourth joint 91 gradually changes from a perfect circle shape to an egg shape from the upstream side (first side) to the downstream side (second side). Has changed. The fourth joint 91 converts the shape of the pipe inner surface 10 b of the drain pipe 10 from the perfect circle shape formed by the inner peripheral surface of the third joint 83 to the egg shape formed by the inner peripheral surface of the second divided pipe 82. As shown in FIGS. 13 and 14, the inner peripheral surface of the joint body 14a of the second joint 14 also changes from a perfect circle shape to an egg shape from the upstream side (first side) to the downstream side (second side). It is gradually changing. The inner peripheral surfaces of the receiving ports 12b, 12c, 14b, 14c, 83b, 83c, and 93 of the joints 12, 14, 83, and 91 have a perfect circle shape over the entire length in the tube axis direction.

  As shown in FIGS. 6, 8, and 14, the above-described egg shape is such that the inner peripheral surface of the horizontal tubes 13, 15 and the inner peripheral surfaces of the joint bodies 12 a, 14 a, 83 a of the joints 12, 14, 83 are wide. It is formed by projecting toward the inside in the direction W, and in the horizontal tubes 13 and 15 and the joint main bodies 12a, 14a and 83a, the thickness of the top portion 21 and the bottom portion 22 is thinner than the thickness of the side portion 23. ing. Of the horizontal tubes 13 and 15 and the joint bodies 12a, 14a, and 83a, the thickness of the thinnest portion (that is, the thickness of the top portion 21 and the bottom portion 22) is equal to the thickness of the vertical tube 11, for example. Yes.

4 and 11, the thickness of the thinnest portion of the first divided pipe 81 is equal to or greater than the thickness of the flange portion 85 (joint body 83a) of the third joint 83. Yes. The thickness of the flange portion 85 is equal to or greater than the thickness of the end portion of the insertion port 92 of the fourth joint 91. The thickness of the thinnest portion of the step 94 of the fourth joint 91 is equal to or greater than the thickness of the thinnest portion of the second divided pipe 82.
From the above, when the cross section of the drainage pipe 10 as shown in FIG. 11 is viewed from the upstream side, the flange portion 85 (joint body 83a) of the third joint 83, the end of the insertion port 92 of the fourth joint 91 and the stepped portion. No step 94 is a step (step toward the upstream side) that protrudes radially inward from the pipe inner surface 10b. Thereby, when drainage flows from the upstream side to the downstream side, it is possible to effectively suppress the pipe inner surface 10b from obstructing the drainage flow or the filth being caught on the pipe inner surface 10b.

  Each constituent member 20 can be manufactured by any manufacturing method. For example, each component member 20 may be formed by injection molding using a mold having an internal space having the same shape as the outer shape of each component member 20. In addition, for example, as the inner peripheral surface, a first preform having a flow path cross-sectional area smaller than the above-described egg shape is molded, and the inner peripheral surface of the first preform is cut to obtain the inner periphery. You may form the structural member 20 whose surface makes the above-mentioned egg shape. Further, for example, by molding a second preform having a shape having a larger flow path cross-sectional area than the above-mentioned egg shape as the inner peripheral surface, and fixing an additional member to the inner peripheral surface of the second preform. The constituent member 20 whose inner peripheral surface forms the above-described egg shape may be formed.

As described above, according to the drain pipe 10 and the component member 20 according to the present embodiment, the flow path forming portion 20c on the inner peripheral surface 20b of the component member 20 has an egg shape in the cross-sectional view. Therefore, the constituent member 20 (drainage pipe 10) can be arranged so that the egg-shaped tapered portion is located at the bottom of the pipe. Thereby, for example, the water level is increased even when the same amount of drainage is discharged compared to the case of adopting a structural member (drainage pipe) having a circular shape in cross section on the inner peripheral surface. Etc., and clogging of sewage can be suppressed.
And the outer peripheral surface 20a of the structural member 20 is a perfect circle shape. Therefore, it can be constructed in the same manner as a general component (drainage pipe).

Since the drain pipe 10 includes the component member 20, it is possible to suppress clogging of filth while ensuring workability.
The drain pipe 10 discharges the waste water from the water-saving toilet 3 with a small amount of drainage and easily clogged with dirt. Therefore, the effect that the clogging of filth as described above can be suppressed can be remarkably achieved.

By the way, in the 1st coupling 12, the flow path formation part 20c changes from a perfect circle shape to an egg shape. Therefore, the flow path connecting the vertical tube 11 and the first horizontal tube 13 can be gradually changed from a perfect circle shape to an egg shape from the upstream side toward the downstream side.
Moreover, also about the 4th joint 91, the flow-path formation part 20c has changed from perfect circle shape to egg shape. Moreover, the perfect circular channel cross-sectional area formed by the fourth joint 91 is larger than the egg-shaped channel cross-sectional area formed by the first divided pipe 81. Therefore, as shown in FIG. 11, the flow path cross-sectional area of the fourth joint 91 is made larger than the flow path cross-sectional area of the first split pipe 81 at the connection portion between the fourth joint 91 and the first split pipe 81. Can do. Further, the flow passage cross-sectional area of the fourth joint 91 and the flow passage cross-sectional area of the second split pipe 82 can be made equal at the connection portion between the fourth joint 91 and the second split pipe 82. Therefore, the flow path connecting the first divided pipe 81 and the second divided pipe 82 can be gradually decreased from the upstream side toward the downstream side without sharply narrowing the first divided pipe 81. .

  In the first joint 12 and the fourth joint 91 (tube) as described above, the flow path forming portion 20c changes from a perfect circle shape to an egg shape. Therefore, by these joints 12 and 91, the first pipe on the upstream side (for example, the vertical pipe 11 and the first divided pipe 81) and the second pipe on the downstream side (for example, the first horizontal pipe 13 and the second pipe). When connecting the divided pipe 82), the first pipe regardless of the cross-sectional view shape of the flow path forming portion 20c of the first pipe or the cross-sectional view shape of the flow path forming portion 20c of the second pipe And the second pipe can be easily connected smoothly.

  In addition, you may employ | adopt the structure which formed the 3rd joint 83 and the 4th joint 91 which concern on this embodiment integrally like the 5th joint 95 shown to FIG. 15 and FIG. The fifth joint 95 includes a joint body 95a (flow path forming portion 20c) that forms the pipe inner surface 10b, an upstream receiving port 95b that is positioned on the upstream side of the joint body 95a and into which the first divided pipe 81 is fitted, A downstream receiving port 95c, which is located on the downstream side of the joint body 95a and into which the second divided pipe 82 is fitted. The inner peripheral surface of the joint body 95a gradually changes from a perfect circle shape to an egg shape from the upstream side (first side) toward the downstream side (second side).

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the embodiment, the joints 12 and 14 are formed in an L shape, and the angle formed between the receiving ports 12b, 12c, 14b, and 14c in each joint 12 and 14 is approximately 90 degrees, but the present invention is not limited to this. I can't. For example, the angle at the second joint 14 may be 135 degrees. The larger the angle (for example, 135 degrees than 90 degrees), the more gently the bending of the joint body 14a, and the more difficult it is for dirt to stay in the joint body 14a.
Further, like the first joint 112 and the second joint 114 according to the modification shown in FIGS. 17 and 18, the joint bodies 12 a and 14 a are joint bodies of the first joint 12 and the second joint 14 according to the embodiment. It may be longer than 12a and 14a. Moreover, like the 2nd coupling 214 which concerns on the modification shown in FIG. 19, the coupling main body 14a may be shorter than the coupling main body 14a of the 2nd coupling 14 which concerns on the said embodiment.

Furthermore, although the said embodiment demonstrated the case where the four couplings 12, 14, 83, 91 of the 1st coupling 12, the 2nd coupling 14, the 3rd coupling 83, and the 4th coupling 91 were used, four couplings were used. For example, five or more joints may be provided from the water-saving toilet 3 (drainage facility 1) to the drainage header 2. However, in order to improve the transportability of filth, it is preferable that the number of bending joints such as so-called elbows is 4 or less.
Furthermore, the first horizontal tube 13 may not be provided. In this case, an insertion port may be provided in place of the downstream receiving port 12 c of the first joint 12, and the insertion port may be inserted into the upstream receiving port 14 b of the second joint 14. In this case, for example, the drainage gradient of the second horizontal pipe 15 can be adjusted by appropriately designing the second joint 14.

Further, in the above-described embodiment, the case where the egg shape is symmetric in the width direction W orthogonal to the vertical direction Z in the cross-sectional view is described, but the egg shape is asymmetric in the width direction W orthogonal to the vertical direction Z in the cross-sectional view. May be.
Furthermore, in the above-described embodiment, the case where the egg shape gradually spreads in the width direction W as it goes from the upper side to the lower side and then gradually narrows is explained. You may have the diameter-reduced level | step-difference part.
Furthermore, although the said embodiment demonstrated the case where the egg-shaped maximum width part is located above the center part of the egg-shaped vertical direction Z, the maximum width part is the center of the egg-shaped vertical direction Z. It may be located below the part.

Furthermore, although the said embodiment demonstrated the case of egg shape by cross-sectional view, it is not restricted to this. For example, in the cross-sectional view of the drainage pipe 10, the drainage pipe 10 has a second straight line that is orthogonal to the first straight line passing through the bottom 22 and the center (pipe axis) of the drainage pipe 10 and passes through the center of the drainage pipe 10. When the flow path is divided in the vertical direction Z into an upper side and a lower side, another form in which the lower side cross-sectional area of the second straight line is smaller than the upper side cross-sectional area may be adopted. Thereby, it becomes possible to raise the water level at the time of drainage, and clogged sewage can be suppressed.
In this case, the first shape and the second shape are mixed as a cross-sectional view shape in the flow path of the drain pipe 10.
The first shape is, for example, a perfect circle shape. In the first shape, when the flow path of the drain pipe 10 is divided in the vertical direction Z by the second straight line in the cross-sectional view, the upper flow cross-sectional area S1a of the second straight line and the lower flow path break The area S1b is equivalent.
The second shape is, for example, an egg shape. In the second shape, when the flow path of the drain pipe 10 is divided in the vertical direction Z by the second straight line in the cross-sectional view, the lower flow cross-sectional area S2b of the second straight line It is smaller than the area S2a. In the second shape, S2a / S2b, which is the ratio of the upper channel cross-sectional area S2a and the lower channel cross-sectional area S2b, may be larger than the ratio S1a / S1b in the first shape. Further, the lower channel cross-sectional area S2b in the second shape may be smaller than the lower channel cross-sectional area S1b in the first shape.
As a joint employed in such a drain pipe 10, the flow path forming portion 20 c has a first shape from the first side to the second side in the pipe axis direction of the drain pipe 10 in the cross-sectional view. A configuration that changes to the second shape can be employed.

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

3 Water-saving toilet 10 Drain pipe 10b Pipe inner surface 12, 14, 83, 91 Joint 20a Outer peripheral surface 20b Inner peripheral surface 20c Flow path forming part

Claims (3)

A joint for a drain pipe,
Of the inner peripheral surface, the flow path forming portion that forms the pipe inner surface of the drain pipe is second from the first side in the pipe axis direction of the drain pipe in a cross-sectional view orthogonal to the pipe axis of the drain pipe. A joint that changes from a perfect circle shape to an egg shape toward the side.   The joint according to claim 1, wherein the outer peripheral surface has a perfect circle shape over the entire length in the tube axis direction. A water-saving toilet,
A drain pipe comprising the joint according to claim 1 or 2,
The drainage pipe is a drainage system for discharging drainage from the water-saving toilet.

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