JP2010270465A - Storage tank for siphon drainage system, and siphon drainage system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a storage tank for a siphon drainage system that can restrain an attachment from sticking to a wall part. <P>SOLUTION: A first stream changing member 64 and a second stream changing member 66 are fixed to a partition wall part 54 in an individual storage space 52C of the storage tank 50. The first stream changing member 64 is disposed in a position to face an inflow port 53C, and the second stream changing member 66 is disposed on the outflow port 55C side with a space from the first stream changing member 64. The first stream changing member 64 is formed with a first stream changing surface 64A of round shape for receiving drainage that flows in from the inflow port 53C and allowing the drainage to flow toward the second stream changing member 66. The second stream changing member 66 is formed with a second stream changing surface 66A for receiving a stream from the first stream changing member 64 side and allowing a part of the stream to flow toward a first corner 61, and a third stream changing surface 66B formed downstream of the second stream changing surface 66A and allowing a part of the stream passing along the second stream changing surface 66A to flow toward a second corner 62. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a siphon drainage system and a storage tank for a siphon drainage system used in the siphon drainage system.

  In recent years, siphon drainage systems have been proposed in place of conventional gradient drainage systems. As described in Patent Document 1, the siphon drainage system is composed of a watering device and a siphon drainage pipe. The siphon drainage system generates a siphon force (negative pressure) generated in a dredging pipe that forms the hanging part of the siphon drainage pipe. It is a system that uses it to improve drainage efficiency from watering equipment.

  Furthermore, in the siphon drainage system, it has also been proposed to install a storage tank for temporarily storing drainage from a watering device in the drainage system.

  In the siphon drainage system, there is a time lag from the start of drainage to the start of siphon force. It can be solved by drainage storage. In other words, until the storage tank is full, drainage from the watering device can be performed by collecting the wastewater from the watering device in the storage tank (see Patent Document 2).

JP-A-6-42019 JP 2006-336322 A

  By the way, in the case where a storage tank is provided and wastewater is temporarily stored in the storage tank, measures against dirt inside the storage tank are required. If dirt such as scale adheres to the wall surface of the storage tank, this deposit may cause problems such as blocking the flow of drainage in the storage tank, and reducing the volume of the storage tank due to the accumulation of deposits. Can be considered. Furthermore, once the deposits adhere, the deposits may become larger using the deposit as a nucleus, or the deposits may affect the physical properties of the storage tank itself, and deterioration may proceed.

  The present invention has been made in view of the above-described facts, and provides a siphon drainage system storage tank capable of suppressing adhesion of deposits, and a siphon drainage system including the siphon drainage system storage tank. The purpose is to do.

  The storage tank for siphon drainage system according to claim 1 of the present invention is a storage tank for temporarily storing drainage discharged from a watering device in the siphon drainage system, and constitutes a storage space for storing drainage. A wall portion configured to be formed in the wall portion, and an inflow port configured to allow the drainage discharged from the watering device to flow into the storage space, and the wall portion configured to flow out the drainage from the storage space to the siphon drain pipe. An outlet to be discharged, and a flow direction of the wastewater introduced from the inlet so as to flow toward a wall portion at a position where the wastewater stays on the outlet side of the inlet than the inlet. And a changing water flow direction changing means.

  In the storage tank for the siphon drainage system of the present invention, the water flow direction changing means is arranged in the storage space. The water flow direction changing means changes the flow direction of the wastewater that has flowed in from the inflow port so as to flow toward the wall portion where the wastewater stays on the outflow side from the inflow port of the wastewater. The stagnation of the drainage here means the stagnation of the drainage in the storage space when the water flow direction changing means is not arranged.

  In the wall portion constituting the storage space, it has been clarified through experiments that the portion where the adhering matter is largely attached is the portion where the wastewater stays on the drainage outlet side. Therefore, in the present invention, the water flow direction of the wastewater that has flowed in from the inlet is changed so as to flow toward the wall portion where the wastewater stays on the drainage outlet side. Thereby, since a water flow hits the wall part of the position where waste_water | drain retains, adhesion of the deposit | attachment to a wall part can be suppressed.

  The storage tank for siphon drainage system according to claim 2, wherein the wall portion includes a side wall portion, a ceiling portion, and a bottom portion, and the water flow direction changing means is at least one of the side wall portion, the ceiling portion, and the bottom portion. It is made into the projection shape which protruded in the said storage space from the location.

  In this way, the water flow direction changing means can be changed to the water flow direction of the wastewater flowing in from the inflow port by forming the protrusion shape protruding into the storage space from at least one of the side wall portion, the ceiling portion, and the bottom portion. it can.

  The storage tank for siphon drainage system according to claim 3, wherein the water flow direction changing means changes the water flow direction of the waste water that has flowed in from the inflow port so as to flow toward the corner on the outflow side. It is characterized by.

  The corners here include R-shaped corners. Since deposits are particularly likely to adhere to the corners on the outlet side, adhesion of deposits can be effectively suppressed by directing the water flow toward the corners by the water flow direction changing means.

  The storage tank for siphon drainage system according to claim 4, wherein the corner portion is configured at two locations on both sides of the outlet, and the water flow direction changing means is configured to remove the wastewater flowing in from the inlet. A fourth water flow changing surface that changes the water flow direction so that one of the two divided water flows toward the one corner and the other one of the two divided water discharges toward the other corner And a fifth water flow changing surface for changing the water flow direction.

  According to the said structure, a water flow can be applied to each of the corner | angular part of the both sides of an outlet by the simple structure which provides a 4th water flow change surface and a 5th water flow change surface.

  The storage tank for siphon drainage system according to claim 5 is characterized in that the water flow direction changing means changes the flow direction of the waste water flowing in from the inflow port into two or more directions.

  In this way, by dividing the water flow in two or more directions, the water flow can be applied to a plurality of locations on the wall portion, and adhesion of deposits on the wall portion can be effectively suppressed.

  A siphon drainage system according to a sixth aspect includes the siphon drainage system storage tank according to any one of the first to fifth aspects.

  The siphon drainage system of the present invention can maintain good siphon drainage because adhesion of deposits to the storage tank is suppressed.

  Since the present invention is provided with the water flow direction changing means in the storage space as described above, it is possible to suppress the adhesion of deposits to the wall.

It is the schematic which shows the whole structure of the siphon drainage system which concerns on this embodiment. It is a perspective view which shows the storage tank and various piping which concern on this embodiment. It is a perspective view which shows the inside of the storage tank which concerns on this embodiment. It is sectional drawing which shows the inside of the storage tank which concerns on this embodiment. It is the figure which looked at the inside of the storage tank concerning this embodiment from the upper surface. It is a perspective view which shows an example of the 3rd water flow change member which concerns on this embodiment. It is explanatory drawing which shows a mode that a deposit | attachment adheres to the change of the water level near the outflow port of a storage tank, and an inner wall. It is explanatory drawing which shows the change of the water level as the whole storage tank. It is the figure which looked at the inside of the storage tank concerning the modification of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank concerning other modifications of this embodiment from the upper surface. It is the figure which looked at the inside of the storage tank of a prior art example from the upper surface.

  Embodiments according to the present invention will be described below with reference to the drawings.

  First, the overall configuration of the siphon drainage system according to the present embodiment will be described. FIG. 1 is a schematic view showing the overall configuration of the siphon drainage system according to the present embodiment.

  A siphon drainage system 10 according to the present embodiment is a drainage system that efficiently drains drainage from a watering device using siphon force.

  The siphon drainage system 10 of this embodiment is mainly used in an apartment house composed of a plurality of floors. As shown in FIG. 1, the siphon drainage system 10 includes a drainage stack 12 that allows drainage to flow downward.

  A plurality of watering devices 16 are provided in each door of each floor of the apartment house, and one end of a drain introduction pipe 18 through which drainage discharged from the watering device 16 flows is connected to each watering device 16. ing. A single watering device 16 may be provided. The other end of the drainage introduction pipe 18 is connected to the storage tank 50. The drainage introduction pipe 18 is disposed with a gradient so that the storage tank 50 side is lowered. The drainage introduction pipe 18 is preferably disposed with a gradient as described above, but may be non-gradient.

  The storage tank 50 is for temporarily storing drainage from the watering device 16. As shown in FIG. 2, the storage tank 50 includes an outer wall portion 51A, a bottom portion 51B, and a lid portion 51C. As shown in FIG. 3, a storage space 52 is configured inside the storage tank 50. The storage space 52 is partitioned into three individual storage spaces 52A, 52B, and 52C by a partition wall portion 54. In addition, although it is preferable that the storage space 52 is divided in this way, it does not necessarily need to be divided into several spaces and can also be set as the structure without a partition wall part. As shown in FIG. 4B, the partition wall portion 54 is arranged up to a position slightly lower than the uppermost portion of the outer wall portion 51A so that the individual storage spaces 52A, 52B, and 52C communicate with each other above. ing. As a result, the three individual storage spaces 52A to 52C are communicated with each other at the upper portion, so that drainage can flow into the other individual storage space 52 from one individual storage space 52 whose water level has risen.

  In the outer wall portion 51A, inflow ports 53A, 53B, and 53C are configured at positions corresponding to the individual storage spaces 52A, 52B, and 52C, respectively. The plurality of drainage introduction pipes 18 from the watering device 16 described above are respectively communicated with the individual storage spaces 52A, 52B, 52C via the inflow ports 53A, 53B, 53C.

  In addition, outlets 55A, 55B, and 55C are configured in the outer wall portion 51A at positions corresponding to the individual storage spaces 52A, 52B, and 52C, respectively. Siphon drain pipes 22A, 22B, and 22C are connected to each of the outlets 55A, 55B, and 55C (these are collectively referred to as “siphon drain pipe 22”).

  As shown in FIG. 1, the siphon drain pipe 22 includes a horizontal pulling pipe 24 disposed along the floor slab 14, and a soot pipe 26 communicating with the horizontal pulling pipe 24. The horizontal pipe 24 communicates with the storage tank 50 and is disposed on the floor slab 14 with no gradient in the horizontal direction. The soot pipe 26 communicating with the horizontal pulling pipe 24 is disposed in the vertical direction (vertical direction) along the drainage stack 12. The soot pipe 26 is connected to the drainage stack 12 through a junction joint 40. The junction joint 40 joins the drainage from the soot pipe 26 to the drainage stack 12.

  The horizontal pulling pipe 24 and the vertical pipe 26 are constituted by one drain pipe (including a case where a plurality of members are connected to constitute one drain pipe), and the junction joint 40 is connected to other drain pipes. The drainage is guided to the drainage stack 12 without joining on the way. Further, the inner diameter of the horizontal pulling pipe 24 and the dredging pipe 26 is set so that the drainage flows in a full flow. A siphon force in the direction of drainage is applied to the drainage in the horizontal pipe 24 by the energy of the siphon head Hs.

  The lid 51C of the storage tank 50 is configured with a convex ventilation portion 31 on the upper side so as to straddle the individual storage spaces 52A to 52C. One end side of the vent pipe 30 is connected to the vent portion 31. The other end side of the vent pipe 30 is connected to the drainage stack pipe 12 through a junction joint 40. The inside of the storage tank 50 can be set to atmospheric pressure by the vent pipe 30. Note that a ventilation valve that ventilates the inside and outside of the storage tank 50 may be used instead of the ventilation pipe 30. The vent pipe 30 and the vent valve are preferably installed, but are not essential components.

  As shown in FIG. 5, a first corner 61 and a second corner 62 are formed on the outlet 55 </ b> C side of the individual storage space 52 </ b> C of the storage tank 50. In the state where the first water flow changing member 64 and the second water flow changing member 66, which will be described later, are not provided, the first corner portion 61 and the second corner portion 62 are configured to discharge drainage on the outlet 55C side of the individual storage space 52C. It is a place to stay. Further, a third corner portion 63 and a fourth corner portion 67 are configured on the discharge port 55B side of the individual storage space 52B of the storage tank 50. The third corner portion 63 and the fourth corner portion 67 are locations where drainage stays particularly on the outlet 55B side of the individual storage space 52B in a state where a third water flow changing member 68 described later is not provided. .

  A first water flow changing member 64 and a second water flow changing member 66 are fixed to the partition wall portion 54 in the individual storage space 52 </ b> C of the storage tank 50. The first water flow changing member 64 is arranged at a position facing the inlet 53C, and the second water flow changing member 66 is arranged on the outlet 55C side with a space from the first water flow changing member 64. The first water flow changing member 64 is formed with an R-shaped first water flow changing surface 64 </ b> A that receives the waste water flowing in from the inlet 53 </ b> C and flows toward the second water flow changing member 66. The second water flow changing member 66 receives a water flow from the first water flow changing member 64 side and flows a part of the water flow toward the first corner portion 61, and a second water flow changing surface 66A. A third water flow changing surface 66B that allows a part of the water flow that has passed through the second water flow changing surface 66A on the downstream side of 66A to flow toward the second corner portion 62 is formed.

  A third water flow changing member 68 is fixed to the bottom 51 </ b> B in the individual storage space 52 </ b> B of the storage tank 50. The third water flow changing member 68 is disposed slightly on the outlet 55B side at a position facing the inlet 53B. The third water flow changing member 68 has a triangular shape when viewed from the upper side, and is arranged so that the apex faces the inflow port 53B side.

  The third water flow changing member 68 may have a triangular prism shape, a triangular pyramid shape as shown in FIG. 6 (A), or a third pyramidal shape as shown in FIG. 6 (B). The fourth water flow changing surfaces 68A and 68B may be formed in an R shape.

  On both sides of the apex of the third water flow changing member 68 on the inlet 53B side, a fourth water flow changing surface 68A and a fifth water flow changing surface 68B are formed. The fourth water flow changing surface 68 </ b> A receives the waste water flowing in from the inlet 53 </ b> B and changes the water flow direction so that the waste water goes to the third corner portion 63. The fifth water flow changing surface 68 </ b> B receives the waste water flowing in from the inflow port 53 </ b> B and changes the water flow direction so that the waste water goes to the fourth corner portion 67.

  A third water flow changing member 68 similar to the third water flow changing member 68 is also fixed to the bottom 51B in the individual storage space 52A.

  Next, drainage in the siphon drainage system 10 of this embodiment will be described.

  Drainage from the watering device 16 flows into the storage tank 50 through the drainage introduction pipe 18. The drainage from the drainage introduction pipe 18 first flows into the storage spaces 52 (individual storage spaces 52A to 52C) to which the respective drainage introduction pipes 18 are connected.

  The waste water that flows into the individual storage spaces 52A to 52C is discharged from the siphon drain pipes 22A to 22C connected to the individual storage spaces 52A to 52C. When the inflow amount from the drainage introduction pipe 18 exceeds the drainage amount in the siphon drain pipes 22A to 22C before the siphon force is activated, the stored water levels in the individual storage spaces 52A to 52C are increased. At this time, as shown in FIG. 7 (A), a component (floating matter D) having a specific gravity, such as oil and fat, detergent foam, etc., which is lighter than water, contained in the waste water floats on the water surface. Oils and fats, detergent bubbles and the like cause deposits such as scales. In this state, when the siphon force in the siphon drain pipes 22A to 22C is activated, the water level in the vicinity of the outlets 55A to 55C is drastically lowered as shown in FIG. Thereby, the floating substance D on the water surface adheres to the inside of the outer wall portion 51A in the vicinity of the outlets 55A to 55C. It is considered that the suspended matter attached in this way becomes an attached matter such as a scale, and is particularly deposited at the corner.

  On the other hand, in the outer wall portion 51A located far from the outlets 55A to 55C, even if the siphon force is activated and the water level falls from the state where the water level has risen as shown in FIG. Thus, compared with the outflow ports 55A to 55C, the water level does not drop abruptly and falls relatively slowly. Therefore, it is thought that there is little adhesion of the suspended | floating matter D to 51 A of outer wall parts in the inflow port 53A-53C side.

  Here, when the first water flow changing member 64 and the second water flow changing member 66 are not arranged, the waste water flow F in the individual storage space 52C hits the partition wall portion 54 as shown in FIG. Head to the corner 62 side. After the adhering matter D adheres to the outer wall portion 51A and the partition wall portion 54 constituting the second corner portion 62, a crushed trace is confirmed. On the other hand, on the inner side of the outer wall portion 51 </ b> A constituting the first corner portion 61, adhesion of a large amount of deposits was confirmed, and no evidence of the deposits being crushed or peeled off was confirmed.

  Therefore, in the present embodiment, the first water flow changing member 64 and the second water flow changing member 66 are arranged in the individual storage space 52C, and the third water flow changing member 68 is arranged in the individual storage spaces 52A and 52B.

  As shown in FIG. 5, when the drainage flows into the individual storage space 52 </ b> C, the drainage is applied to the first waterflow changing surface 64 </ b> A of the first waterflow changing member 64 and the water flow direction is changed so as to go to the second waterflow changing member 66. . The drainage flows toward the second water flow changing member 66, the water flow direction is further changed by the second water flow changing surface 66A, a part flows toward the first corner 61, and a part flows into the third water flow changing surface. It flows toward the second corner 62 through 66B. Thereby, the water flow which flows toward the 1st corner part 61 and the 2nd corner part 62 generate | occur | produces, and when it hits the outer wall part 51A of the 1st corner part 61 and the 2nd corner part 62 vicinity vigorously, the 1st corner part 61, the adhering matter adhering to the outer wall portion 51A in the vicinity of the second corner portion 62 can be crushed or peeled off. Therefore, it is possible to suppress the accumulation of deposits on the portion of the outer wall portion 51A that is particularly likely to deposit and accumulate.

  Further, when the wastewater flows into the individual storage space 52B, the wastewater is divided into two at the top of the third waterflow changing member 68, and the waterflow is such that the wastewater on the fourth waterflow changing surface 68A side flows toward the third corner portion 63. The direction is changed, and the water flow direction is changed so that the drainage on the fifth water flow change surface 68 </ b> B side flows toward the fourth corner portion 67. Thereby, the water flow which flows toward the 3rd corner | angular part 63 and the 4th corner | angular part 67 generate | occur | produces, and when it hits the outer wall part 51A of the 3rd corner | angular part 63 and the 4th corner | angular part 67 vicinity, it is the 3rd corner | angular part. 63, the adhering matter adhering to the outer wall portion 51A in the vicinity of the fourth corner portion 67 can be crushed or peeled off. Therefore, it is possible to suppress the accumulation of deposits on the portion of the outer wall portion 51A that is particularly likely to deposit and accumulate.

  In the present embodiment, the first water flow changing member 64 and the second water flow changing member 66 are arranged along the partition wall portion 54. However, these may be arranged at other positions or in other shapes. Also good. For example, as shown in FIG. 9, instead of the second water flow changing member 66, a fourth water flow changing member 65 may be arranged in the vicinity of the inlet 53C. The fourth water flow changing member 65 is configured with a sixth water flow changing surface 65A that receives a part (about half) of the drainage from the inlet 53C and changes the water flow direction so as to flow toward the first corner 61. ing. Part of the drainage from the inflow port 53 </ b> C becomes a water flow that flows toward the first corner 61 by the fourth water flow changing member 65, and the other part of the drainage flows to the first corner 61 by the first water flow changing member 64. It becomes a flowing water stream. Even with such a configuration, it is possible to crush or peel off deposits adhering to the outer wall portion 51 </ b> A in the vicinity of the first corner portion 61 and the second corner portion 62.

  Moreover, although this embodiment demonstrated the example which provided the two 1st water flow change members 64 and the 2nd water flow change member 66, as shown in FIG. 10, even if only the 1st water flow change member 64 is provided. Good. Even in the case where the second water flow changing member 66 is not provided, the first water flow changing member 64 is installed, so that the waste water flowing in from the inlet 53C directly hits the partition wall portion 54. A vigorous water flow can be applied to the second corner 62.

  In addition, the inflow port 53C of the individual storage space 52C of the present embodiment is configured at a position for allowing drainage to flow toward the partition wall portion 54, but as shown in FIG. 11, the inflow port 53C has an outflow port 55C. It can also be configured at a position opposite to. In this case, instead of the first water flow changing member 64 and the second water flow changing member 66, the same thing as the third water flow changing member 68 is fixed at the same position as the individual storage space 52B, and the inlet 53C is fixed. It is possible to change the direction of the water flow of the waste water.

  Moreover, although this embodiment demonstrated the example which fixed the 1st water flow change member 64 and the 2nd water flow change member 66 to the partition wall part 54, and fixed the 3rd water flow change member 68 to the bottom part 51B, these water flow The changing member may be fixed to another part, for example, the lid 51C. FIG. 12 shows an example in which the second water flow changing member 66 is fixed to the lid 51C.

  Further, the water flow changing member is installed by being fixed to the outer wall portion 51A, the bottom portion 51B, the lid portion 51C, and the partition wall portion 54 as separate members from the outer wall portion 51A, the bottom portion 51B, the lid portion 51C, and the partition wall portion 54. Can do. Further, the water flow changing member is configured integrally with the outer wall portion 51A, the bottom portion 51B, the lid portion 51C, and the partition wall portion 54, and a part of the outer wall portion 51A, the bottom portion 51B, the lid portion 51C, and the partition wall portion 54 is stored. A shape protruding into the space 52 can also be used.

  Moreover, although this embodiment demonstrated the example in which one inflow port was comprised in one separate storage space, two or more inflow ports can also be comprised. FIG. 13 shows an example in which two inflow ports 53C-1 and 53C-2 are configured in the individual storage space 52C.

  Further, the third water flow changing member 68 of the present embodiment has a triangular shape as viewed from above as shown in FIG. 14A, but other shapes, for example, as shown in FIG. The fourth water flow changing surface 68 </ b> A and the fifth water flow changing surface 68 </ b> B may be shaped to have a concave R on the inside. Further, as shown in FIG. 14C, the fourth water flow changing surface 68A and the fifth water flow changing surface 68B on the inlet 53C side are formed in an R shape that protrudes outward, and the outlet 55C side is the outer wall portion 51A. It can also be made into the shape made parallel to. Further, as shown in FIG. 14D, the fourth water flow changing surface 68A and the fifth water flow changing surface 68B are shaped to have a concave R inward, and the surface on the outlet 55C side is convex outward. R shape can also be used. Further, as shown in FIG. 15E, three triangular faces can be formed in an outwardly convex R shape. Further, as shown in FIG. 15F, a diamond shape may be used. Further, as shown in FIG. 15G, a home base shape (pentagon) may be used.

  Further, the position of the storage space 52 in the storage tank 50 and the positions of the inlet and outlet for each section (individual storage space) vary depending on the installation position of the storage tank 50 and the relationship with other piping and installation objects. However, the setting of the shape and the installation position of the water flow changing member can be changed so that the direction of the water flow is appropriately changed according to these patterns.

  As described above, according to the present embodiment, the water flow changing member is provided in the individual storage spaces 52A to 52C, and the water flow direction is changed toward the portion where deposits are likely to be accumulated. By crushing or peeling off the adhered material, the accumulation of the adhered material can be suppressed.

10 Siphon drainage system 18 Drainage introduction pipe 22 Siphon drainage pipe 50 Storage tank 51A Outer wall 51B Bottom 51C Lid 52 Storage space 53A Inlet 53B Inlet 53C Inlet 54 Partition wall 55A Outlet 55B Outlet 55C Outlet 61 1 corner portion 62 2nd corner portion 63 3rd corner portion 67 4th corner portion 64 1st water flow changing member 66 2nd water flow changing member 68 3rd water flow changing member

Claims (6)

In a siphon drainage system, a storage tank for temporarily storing drainage discharged from a watering device,
A wall portion constituting a storage space for storing waste water;
An inlet configured to flow into the storage space drainage discharged from a watering device, and configured in the wall;
An outlet that is configured in the wall and allows the drainage to flow out of the storage space into a siphon drainpipe;
A water flow direction changing means that changes the flow direction of the wastewater that has flowed in from the inflow port so as to flow toward the wall portion at the position where the wastewater stays on the outflow side of the inflow port than the inflow port. When,
A storage tank for a siphon drainage system.   The wall portion has a side wall portion, a ceiling portion, and a bottom portion, and the water flow direction changing means has a protruding shape that protrudes into the storage space from at least one of the side wall portion, the ceiling portion, and the bottom portion. The storage tank for siphon drainage systems according to claim 1 characterized by things.   The said water flow direction change means changes the water flow direction of the waste_water | drain which flowed in from the said inflow port so that it may flow toward the corner | angular part on the said outflow port side, The Claim 1 or Claim 2 characterized by the above-mentioned. The storage tank for the siphon drainage system.   The corner portion is formed at two locations on both sides of the outlet, and the water flow direction changing means divides the wastewater flowing in from the inlet into two and one of the two divided wastewaters is 1 A fourth water flow changing surface that changes the water flow direction so as to go to the corner of the second water flow, and a fifth water flow changing surface that changes the water flow direction so that the other of the divided drainage goes to the other corner. It has it, The storage tank for siphon drainage systems of Claim 3 characterized by the above-mentioned.   The siphon drainage system according to any one of claims 1 to 3, wherein the water flow direction changing means changes the water flow direction of the wastewater flowing in from the inflow port into two or more directions. Storage tank.   The siphon drainage system provided with the storage tank for siphon drainage systems of any one of Claims 1-5.

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