JP2011183253A - Sand sedimentation tank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sand sedimentation tank capable of removing impurities in raw water regardless of force of inflow of raw water. <P>SOLUTION: The sand sedimentation tank 10 is composed of: a raw water tank 20 in which space 22 in the tank is divided into a tank upper space 22A and a tank lower space 22B with a partition wall 24; a fluid inflow pipe 26 for making raw water flow into the tank lower space 22B; a communicating passage 28 which is installed in the partition wall 24 to make the tank upper space 22A and the tank lower space 22B communicate with each other; a mesh panel 30 which is installed in the communicative passage 28 to regulate passing through of impurities in the raw water; and a fluid discharge passage 32 for making the raw water flow out of the tank upper space 22A. Consequently, this sand sedimentation tank 10 is capable of removing impurities in raw water regardless of the force of inflow of raw water. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sand basin.

  Conventionally, a sand settling tank for removing sand and impurities (dead leaves, etc.) from raw water such as well water is known. This type of sand basin is composed of a raw water tank and a supernatant tank. Raw water flows into the raw water tank, and a supernatant portion of the raw water stored in the raw water tank flows into the supernatant tank.

  In Patent Document 1, a storage tank is provided between the upstream water channel and the downstream water channel, and foreign substances such as sand and floating substances contained in the water to be treated flowing from the upstream water channel in the storage tank are removed.

JP 2002-307052 A

  In Patent Document 1, the upstream water channel and the downstream water channel are connected to the upper layer of the storage tank, and sand, suspended matters, etc. contained in the water to be treated flowing from the upstream water channel sink to the lower layer of the storage tank, and the supernatant The part flows into the downstream channel.

  However, depending on the momentum of the inflow of the water to be treated from the upstream water channel, the water to be treated may flow into the downstream water channel before the sand or suspended matter settles in the lower layer of the storage tank.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a sand settling tank capable of removing impurities in the raw water regardless of the momentum of the raw water inflow.

  The sand settling tank according to claim 1 is provided in the storage tank body in which the space in the tank is partitioned into a tank upper space and a tank lower space by a partition member, a fluid inflow path for allowing raw water to flow into the tank lower space, and the partition member. A communication passage communicating the tank upper space and the tank lower space, a regulating means provided in the communication passage for restricting the passage of impurities in the raw water, and a fluid for causing the raw water to flow out from the tank upper space And an outflow channel.

  In the sand settling tank of claim 1, the raw water flows into the tank lower space through the fluid inflow path. For example, if the inflowing raw water contains impurities (for example, sand) whose specific gravity is heavier than that of the raw water, the impurities settle in the tank lower space due to their own weight. On the other hand, when the inflowing raw water contains impurities having a lighter specific gravity than the raw water (for example, dead leaves), the passage of the impurities is restricted by the restricting means. Thereby, intrusion of impurities into the tank upper space is suppressed, and raw water from which impurities are removed flows out from the fluid outflow passage.

  Here, when the raw water flows into the lower space of the tank vigorously, impurities with a lighter specific gravity than the raw water will flow in the lower space of the tank due to the water flow, but some will collide with the partitioning member, etc. Passage to the upper space is restricted. On the other hand, impurities having a specific gravity greater than that of raw water will sink in the tank lower space due to its own weight even if it drifts in the tank lower space due to the water flow. Thereby, the impurities in the raw water can be removed regardless of the momentum of the raw water inflow.

  A sand settling tank according to claim 2 is the sand settling tank according to claim 1, wherein the inlet of the fluid inflow path is located on one side of the tank lower space, and the communication port of the communication path is the other side of the tank lower space. Located on the side.

  In the sand settling tank according to claim 2, since the inlet of the fluid inflow passage is located on one side of the tank lower space and the communication port of the communication path is located on the other side of the tank lower space, Even if it flows into the lower space, the momentum of the raw water decreases before reaching the communication passage, and impurities having a specific gravity higher than that of the raw water settle in the tank lower space by its own weight before reaching the communication passage. Thereby, impurities in the raw water can be effectively removed.

  A sand sunk tank according to a third aspect is the sand sunk tank according to the first or second aspect, wherein the partition member includes a projecting portion projecting into the tank lower space.

  In the sand settling tank according to claim 3, since the partition member includes the protruding portion protruding into the tank lower space, the flow of raw water that has flowed into the tank lower space vigorously is disturbed by the protruding portion. As a result, the momentum of the raw water decreases before reaching the communication path, and impurities having a specific gravity higher than that of the raw water settle in the tank lower space by its own weight before reaching the communication path. Thereby, impurities in the raw water can be effectively removed.

  The sand settling tank according to claim 4 is the sand settling tank according to any one of claims 1 to 3, wherein an inlet of the fluid inflow passage faces downward.

  In the sand settling tank according to claim 4, since the inflow port of the fluid inflow path faces downward, the raw water that has flowed into the tank lower space vigorously hits the bottom surface of the storage tank main body constituting the tank lower space. descend. As a result, impurities having a higher specific gravity than the raw water settle in the tank lower space by their own weight before reaching the communication path, and the impurities in the raw water are effectively removed.

  The sand settling tank according to claim 5 is the sand settling tank according to any one of claims 1 to 4, wherein a supernatant tank is provided adjacent to the storage tank main body, and the supernatant tank is formed by the fluid outflow path. It communicates with the tank upper space.

  In the sand settling tank of the fifth aspect, the raw water from which impurities in the tank upper space are removed flows out to the supernatant tank adjacent to the storage tank main body through the fluid outflow passage. Thereby, the raw water from which impurities have been removed is stored in the supernatant tank.

  The sand settling tank according to claim 6 is the sand settling tank according to any one of claims 1 to 5, wherein the regulating means is configured by a mesh or a plate member in which a plurality of through holes are formed. .

  In the sand settling tank of claim 6, since the restricting means is constituted by a mesh or a plate member in which a plurality of through holes are formed, impurities in the raw water can be removed with a simple configuration.

  As described above, the sand settling tank of the present invention can remove impurities in the raw water regardless of the momentum of the raw water inflow.

It is a perspective view of the sand settling tank of a 1st embodiment. It is a partially broken perspective view of the sand settling tank of a 1st embodiment. It is a partially broken perspective view of the raw | natural water tank of the sand settling tank of 1st Embodiment. FIG. 4 is a sectional view taken along line AA in FIG. It is the B section expanded sectional view of Drawing 4. It is a front view which shows the perforated panel of other embodiment. It is a front view which shows the communicating path and plate member of other embodiment.

[First Embodiment]
Hereinafter, 1st Embodiment of the sand settling tank of this invention is described, referring drawings.

  As shown in FIG. 1, the sand settling tank 10 is configured by connecting a plurality of rectangular panels. As shown in FIG. 2, the sand settling tank 10 includes a raw water tank 20 and a supernatant tank 40 adjacent to the raw water tank 20. A partition wall 12 is disposed between the raw water tank 20 and the supernatant tank 40. The raw water tank 20 is an example of a storage tank main body.

  As shown in FIGS. 2 and 3, the raw water tank 20 has a tank inner space 22 partitioned by a partition wall 24 into a tank upper space 22 </ b> A and a tank lower space 22 </ b> B. The partition wall 24 includes a plurality of partition wall panels 25 attached to the inner wall surface of the raw water tank 20.

  As shown in FIGS. 3 and 4, the raw water tank 20 is connected to a device for pumping up well water (raw water) (not shown), and the other end (inlet 26A) is located in the tank lower space 22B. 26 is attached. The fluid inflow pipe 26 passes through the tank wall on the tank upper space 22A side of the raw water tank 20, extends toward the tank lower space 22B, and passes through the partition wall 24. The inlet 26A of the fluid inflow pipe 26 faces downward. The raw water pumped up by the pumping device flows into the tank lower space 22B through the fluid inflow pipe 26.

  As shown in FIG. 5, the partition wall 24 is provided with a communication path 28 that connects the tank upper space 22 </ b> A and the tank lower space 22 </ b> B. In addition, the communication path 28 of this embodiment is a clearance formed by the inner wall surface of the raw water tank 20 and the end surface of the partition wall panel 25.

  As shown in FIGS. 4 and 5, the inlet 26A of the fluid inflow pipe 26 is located on one side of the tank lower space 22B, and the communication port 28A of the communication path 28 is located on the other side of the tank lower space 22B. . That is, the inflow port 26A and the communication port 28A are separated from each other.

  As shown in FIGS. 4 and 5, the communication path 28 is provided with a mesh panel 30 as an example of a regulating means for regulating the passage of impurities (for example, dead leaves) in the raw water. The mesh panel 30 is configured by arranging a metal (for example, stainless steel) mesh inside the frame.

  As shown in FIGS. 2 and 3, a fluid outflow passage 32 that communicates the tank upper space 22 </ b> A and the supernatant tank 40 is provided on the tank upper space 22 </ b> A side of the partition wall 12. The fluid outflow path 32 is for allowing the raw water in the tank upper space 22A to flow out (overflow) into the supernatant tank 40, and in the present embodiment, is a through hole formed in the partition wall 12. Note that the fluid outflow path 32 may be anything as long as the tank upper space 22 </ b> A and the supernatant tank 40 can communicate with each other, for example, a gap provided between the partition wall 12 and the ceiling plate of the sand settling tank 10. Good.

  As shown in FIGS. 3 and 4, the bottom plate 34 of the raw water tank 20 is composed of a plurality of bottom plate panels 35. The bottom plate panel 35 includes a protruding portion 35A that gradually protrudes from the end portion toward the central portion toward the tank lower space 22B. In FIG. 4, the protruding portion 35A protrudes upward.

Moreover, the partition wall panel 25 is arrange | positioned facing the baseplate panel 35, and is provided with protrusion part 25A which protrudes gradually from the edge part toward the tank lower part space 22B toward the center part. In FIG. 4, the protruding portion 35A protrudes downward.
In the present embodiment, the bottom plate panel 35 and the partition wall panel 25 have the same shape. For this reason, the protruding portion 25 </ b> A of the partition wall panel 25 faces the protruding portion 35 </ b> A of the bottom plate panel 35.

  As shown in FIG. 4, a discharge pipe 36 for discharging raw water from the raw water tank 20 is connected to the bottom plate panel 35 facing the mesh panel 30. When the raw water is discharged from the raw water tank 20, the discharge pipe 36 is configured to open a valve (not shown) and discharge the raw water to the outside.

Next, the effect of the sand settling tank 10 of 1st Embodiment is demonstrated.
In the sand settling tank 10, the raw water flows into the tank lower space 22B through the fluid inflow pipe 26. Here, when the inflowing raw water contains impurities having a specific gravity higher than that of the raw water (such as sand), the impurities settle in the tank lower space 22B due to their own weight. On the other hand, when the inflowing raw water contains impurities having a lighter specific gravity than the raw water (for example, dead leaves), the impurities are restricted from passing through the tank upper space 22A by the mesh panel 30. As a result, the intrusion of impurities into the tank upper space 22A is suppressed, and the supernatant portion of the raw water from which impurities have been removed flows out from the fluid outflow passage 32 to the supernatant tank 40.

  Moreover, when raw water flows into the tank lower space 22B vigorously, impurities having a lighter specific gravity than the raw water will flow in the tank lower space 22B due to the water flow, but part of the walls (partition walls 24, 24) constituting the tank lower space 22B. The bottom plate 34 and the inner wall surface of the raw water tank 20 collide with each other, and the remainder is restricted by the mesh panel 30 from passing into the tank upper space 22A. On the other hand, impurities having a specific gravity greater than that of the raw water settle in the tank lower space 22B due to their own weight even if they drift in the tank lower space 22B due to the water flow. Thereby, the impurities in the raw water can be removed regardless of the momentum of the raw water inflow. As a result, the supernatant portion of the raw water from which impurities have been removed flows out from the fluid outflow passage 32 to the supernatant tank 40.

  In addition, since the inlet 26A of the fluid inflow pipe 26 is positioned on one side of the tank lower space 22B and the communication port 28A of the communication path 28 is positioned on the other side of the tank lower space 22B, the raw water is vigorously stored in the tank. Even if it flows into the lower space 22 </ b> B, the momentum of the raw water can be reduced before reaching the communication path 28.

Furthermore, since the partition wall panel 25 includes a protruding portion 25A that protrudes into the tank lower space 22B, the flow of raw water that has flowed into the tank lower space 22B is disturbed by the protruding portion 25A. As a result, the momentum of the raw water can be reduced before reaching the communication path 28.
In particular, in the present embodiment, the bottom plate panel 35 includes a protruding portion 35A that protrudes into the tank lower space 22B, and the protruding portion 25A of the partition wall panel 25 and the protruding portion 35A of the bottom plate panel 35 face each other. Therefore, the flow of the raw water that has flowed into the tank lower space 22 </ b> B can be disturbed more effectively, and the momentum of the raw water can be reduced. The impurities are precipitated in a portion having a height lower than that of the protruding portion 35A between the adjacent bottom plate panels 35.

  And since the inflow port 26A of the fluid inflow piping 26 has faced the downward direction, the raw | natural water which flowed into the tank lower space 22B hits the bottom board 34, and a momentum falls.

  From the above, the momentum of the raw water that has flowed into the tank lower space 22 </ b> B decreases, so that impurities having a higher specific gravity than the raw water and some of the impurities having a lower specific gravity than the raw water reach the communication path 28. It sinks in the tank lower space 22B by its own weight. As a result, impurities in the raw water can be effectively removed.

  In addition, with a simple configuration in which the mesh panel 30 is provided in the communication path 28, it is possible to regulate the passage of impurities having a lighter specific gravity than the raw water to the tank upper space 22A.

[Other Embodiments]
In 1st Embodiment, it is set as the structure which provides the mesh panel 30 in the communicating path 28 as an example of a control means, However, This invention is not limited to this structure, If any passage of the impurity in raw | natural water can be controlled, any For example, a perforated panel 38 having a plurality of through holes 38A shown in FIG. 6 may be provided in the communication path 28.

  In the above-described embodiment, the communication path 28 is configured by the end surface of the partition wall panel 25 and the inner wall surface of the raw water tank 20, but the present invention is not limited to this configuration, and as shown in FIG. 24 may be constituted by a partition wall panel 25 and one partition wall panel 50, and an opening may be formed in the partition wall panel 50 to form the communication path 52. The communication passage 52 is provided with a mesh-like plate member 54 as an example of a restricting means.

  In the above-described embodiment, the partition wall panel 25 is provided with the protruding portion 25A that gradually protrudes from the end portion toward the central portion toward the tank lower space 22B. However, the present invention is not limited to this configuration, and raw water The protrusion provided on the partition wall panel 25 may have any shape as long as the momentum during inflow can be reduced by disturbing the flow.

  Furthermore, in the above-described embodiment, the raw water from which impurities are removed is configured to flow out to the supernatant tank 40 through the fluid outflow passage 32. However, the present invention is not limited to this structure, and the fluid outflow is not provided without providing the supernatant tank. It is good also as a structure which connects the path | route 32 to piping of the downstream of the sand settling tank 10 directly.

  In addition, although the sand settling tank 10 of the above-mentioned embodiment is used for the use which removes the impurities in raw | natural water, impurities (an impurity with a higher specific gravity than a fluid and a specific gravity are lighter) from fluids (for example, drainage etc.) other than raw | natural water. It is of course possible to remove (impurities).

  The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments.

10 Sand settling tank 20 Raw water tank (storage tank)
22 space inside the tank 22A space above the tank 22B space below the tank 24 partition wall (partition member)
25A Protruding portion 26 Fluid inflow piping (fluid inflow passage)
26A Inflow port 28 Communication path 28A Communication port 30 Mesh panel (plate member (regulating means))
32 Fluid outflow path 38 Perforated panel (plate member (regulation means))
40 Supernatant tank 52 Communication path 54 Plate member

Claims (6)

A storage tank body in which the space in the tank is partitioned into a tank upper space and a tank lower space by a partition member;
A fluid inflow path through which raw water flows into the tank lower space;
A communication path provided in the partition member and communicating the tank upper space and the tank lower space;
A regulating means provided in the communication path and regulating the passage of impurities in the raw water;
A fluid outflow path for allowing the raw water to flow out of the tank upper space;
A settling tank. The inflow port of the fluid inflow path is located on one side of the tank lower space,
The communication port of the said communicating path is a sand settling tank of Claim 1 located in the other side of the said tank lower space.   The said partition member is a sand settling tank as described in Claim 1 or Claim 2 provided with the protrusion part which protrudes in the said tank lower space.   The sand settling tank according to any one of claims 1 to 3, wherein an inlet of the fluid inflow path faces downward. A supernatant tank is provided adjacent to the storage tank body,
The said supernatant tank is a sand settling tank of any one of Claims 1-4 connected with the said tank upper space by the said fluid outflow path. 6. The sand settling tank according to any one of claims 1 to 5, wherein the restricting means is configured by a mesh member or a plate member in which a plurality of through holes are formed.

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