JP2018167176A - Stirring apparatus and water treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately mix and uniformly disperse with low power when stirring is performed while flowing a liquid. SOLUTION: A stirring device 14 is provided with a water tank 30, a partition wall portion 32 provided in the water tank 30 and divided into a stirring space A1 and an inflow space A2 provided below the stirring space A1 in the vertical direction. The inflow pipe 34 connected to the water tank 30 and allowing the liquid to flow into the inflow space A2, the opening 35 which opens to the partition wall 32 and communicates the inflow space A2 and the stirring space A1, and the inside of the stirring space A1. A shielding portion 36 provided above the opening 35 in the vertical direction and superimposed on the opening 35 when viewed from the vertical direction, and a plurality of plate-shaped members provided on the upper surface of the shielding portion 36 in the vertical direction. A stationary blade portion 38 extending in the radial direction and a stirring portion 40 provided in the stirring space A1 above the stationary blade portion 38 in the vertical direction and agitating the liquid in the stirring space A1. The shielding portion 36 shields the upper side of the communication space A3 in the vertical direction, opens the periphery of the side of the communication space A3, and makes the inflow space A2 and the stirring space A1 lateral to the communication space A3. Communicate through the surroundings. [Selection diagram] Fig. 2

Description

  The present invention relates to a stirrer and a water treatment system for clean water.

  Water, that is, water for waterworks, is purified by adding flocculant to river water (raw water), for example, and removing the floc and supplying it to households. When adding the flocculant, the raw water is stirred so that the flocculant is mixed and dispersed in the raw water. At that time, there is a demand for a stirring device that achieves uniform mixing and dispersing action efficiently with low power.

  In a conventional stirring apparatus, a turbine blade or a paddle blade has been used as the stirring blade that gives this uniform mixing and dispersion action. These turbine blades and paddle blades basically had large resistance to water flow, and had problems in efficiency such as high power consumption to achieve mixing and homogenization.

  As a stirring device that solves the problem in efficiency and realizes uniform mixing / dispersing action efficiently with low power, for example, Patent Document 1 discloses a baffle at the bottom of a stirring tank in which a liquid in which slurry is mixed is stored. And a technique of stirring the slurry and liquid with low power by stirring with a stirring device provided at the top of the stirring tank.

Japanese Patent Laid-Open No. 7-60093

  However, when stirring the clean water, it is necessary to stir the raw water continuously flowing into the stirring tank. In such a case, in the configuration of Patent Document 1, there is a possibility that the water flow by stirring may be disturbed by the flow of raw water that flows in, and it is difficult to adapt as it is.

  The present invention has been made in view of the above, and in the case where stirring is performed while flowing a liquid, a stirring device and a water treatment system in clean water that can be appropriately mixed and uniformly dispersed with low power. The purpose is to provide.

  In order to solve the above-described problems and achieve the object, a stirrer of the present disclosure is provided in a water tank, the water tank, an agitating space, and an inflow space provided below the stirring space in a vertical direction. A partition part that is divided into: an inflow pipe that is connected to the water tank and allows liquid to flow into the inflow space; an opening that opens to the partition part and communicates the inflow space and the agitation space; A shielding portion that is provided in the stirring space and above the opening in the vertical direction so as to overlap the opening when viewed from the vertical direction, and is provided on a surface on the upper side in the vertical direction of the shielding portion. A stationary blade portion in which the plate-shaped member extends in the radial direction, and a stirring portion provided in the stirring space and above the stationary blade portion in the vertical direction, and stirring the liquid in the stirring space And the shielding portion includes the shielding portion and the opening. While shielding the upper side in the vertical direction of the communication space, which is the space between, the periphery of the side of the communication space is opened, the inflow space and the stirring space via the periphery of the side of the communication space Communicate.

  It is preferable that the stirring device further includes an outlet that is provided above the stirring unit in the vertical direction and allows the liquid in the stirring space to flow out.

  It is preferable that the shielding portion overlaps the entire area of the opening as viewed from the vertical direction.

  It is preferable that the area of the area around the side of the communication space that is open is greater than or equal to the opening area of the opening.

  The stirrer stirs the liquid in the stirrer space, so that an ascending water flow that spirally rises from the stationary blade portion toward the stirrer portion, and from the periphery of the stirrer portion to the periphery of the stationary blade portion. It is preferable that a descending water flow that spirally descends toward the stationary blade portion is generated, and the liquid water flow that has flowed in from the inflow space through the opening is merged with the descending water flow.

  It is preferable that the stirring device has a flocculant addition unit for adding a flocculant to the liquid.

  In order to solve the above-described problems and achieve the object, a water treatment system of the present disclosure is a water treatment system for clean water having the stirring device.

  According to the present invention, when stirring is performed while a liquid is introduced, mixing and uniform dispersion can be appropriately performed with low power.

FIG. 1 is a schematic block diagram of a water treatment system according to the present embodiment. FIG. 2 is a schematic diagram of the stirring device according to the present embodiment. FIG. 3 is a schematic diagram of a stirring device according to the present embodiment. FIG. 4 is a schematic diagram for explaining the operation of the stirring device according to the present embodiment. FIG. 5 is a schematic diagram illustrating another example of the shape of the shielding portion. FIG. 6 is a schematic diagram illustrating another example of the shape of the stationary blade portion.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments described below.

(Configuration of water treatment system)
FIG. 1 is a schematic block diagram of a water treatment system according to the present embodiment. As shown in FIG. 1, the water treatment system 100 according to the present embodiment includes a landing well 12, a stirring device 14, a floc growth tank 16, a precipitation tank 18, and a filtration tank 20. The water treatment system 100 is a system that performs raw water treatment on the raw water W1 taken into the landing well 12 and supplies the raw water W5 to the outside. That is, the water treatment system 100 is a water purification facility, and is a facility for supplying clean water (water for water supply) W5 to each household.

  The landing well 12 is a facility that takes in the raw water W1. The landing well 12 is a water tank in which raw water W1 from, for example, a river is introduced and the flow rate of the raw water W1 is adjusted in order to perform water treatment in each facility in the subsequent stage.

  The stirring device 14 is a water tank into which raw water W1 flows from the landing well 12. The agitating device 14 is a water tank facility for agitation in which the raw water W1 flows into the water tank and the raw water W1 is stirred while adding the flocculant P to the raw water W1. The detailed configuration of the stirring device 14 will be described later. The stirring device 14 supplies the raw water W1 stirred with the flocculant P added thereto to the subsequent flock growth tank 16 as added water W2.

  The flock growth tank 16 has a plurality of water tanks 16A, and a stirrer 16B is provided in each water tank 16A. The flock growth tank 16 stores the added water W2 in the water tank 16A, and stirs the stored added water W2 with the stirrer 16B. The stirring speed (rotation speed) of the stirrer 16B is lower than the stirring speed (rotation speed) of the stirring unit 40 included in the stirring device 14 described later. The floc growth tank 16 stirs the added water W2 with the stirrer 16B, thereby generating flocs in the added water W2 and growing the flocs. Note that the flock growth tank 16 may not have a plurality of water tanks 16A, and may have only one water tank 16A.

  Flock-containing water W3, which is added water W2 in which flocs are grown in the floc growth tank 16, flows into the settling tank 18. The sedimentation tank 18 stores the floc-containing water W3 to precipitate the grown floc. Thereby, the sedimentation tank 18 isolate | separates the floc containing water W3 into a floc and the supernatant water W4. That is, the supernatant water W4 is water obtained by separating flocs from the floc-containing water W3.

  The supernatant water W4 flows from the settling tank 18 into the filtration tank 20. The filtration tank 20 includes a filtration unit 22 that performs sand filtration, for example. The filtration tank 20 separates a fine solid component from the supernatant water W4 by filtering the supernatant water W4 through the filtration unit 22. The filtration tank 20 discharge | releases the supernatant water W4 which isolate | separated the solid component to the exterior as the top water W5. Hereinafter, when the raw water W1, the added water W2, the flock-containing water W3, the supernatant water W4, and the clean water W5 are not distinguished from each other, they are referred to as water W. The water treatment system 100 has the above configuration.

(Configuration of stirring device)
Hereinafter, the stirring device 14 will be described in detail. 2 and 3 are schematic views of the stirring device according to the present embodiment. FIG. 2 is a cross-sectional view of the stirring device 14, and FIG. 3 is a top view of the stirring device 14. As shown in FIG. 2, the stirring device 14 includes a water tank 30, a partition wall portion 32, an inflow pipe 34, an opening portion 35, a shielding portion 36, a stationary blade portion 38, a stirring portion 40, and a flocculant added. Part 42. The agitator 14 takes the raw water W1 into the water tank 30, stirs the raw water W while adding the flocculant P to the raw water W1, and uses the raw water W1 stirred with the flocculant P added as the added water W2 outside ( Here, it is discharged into the floc growth tank 16).

  As shown in FIGS. 2 and 3, the water tank 30 is a water tank into which raw water W flows. The water tank 30 is a rectangular parallelepiped water tank, but may be, for example, a cylindrical water tank, and the shape thereof is arbitrary. For example, the length of the water tank 30 along the X direction is 3 m, the length along the Y direction is 3 m, and the length along the Z direction is 4 m. However, the length of each direction of the water tank 30 is an example and is arbitrary. The X direction is a direction parallel to the horizontal direction. The Y direction is a direction parallel to the horizontal direction and orthogonal to the X direction. The Z direction is a direction orthogonal to the X direction and the Y direction, that is, a vertical direction. Hereinafter, one direction along the Z direction is referred to as a Z1 direction, and the other direction along the Z direction is referred to as a Z2 direction. The Z1 direction is a direction that goes upward in the vertical direction (a direction away from the ground surface), and the Z2 direction is a direction that goes downward in the vertical direction (a direction toward the ground surface).

  The water tank 30 has an inlet 50 and an outlet 52. The inflow port 50 is an opening through which the raw water W <b> 1 flows through the inflow pipe 34. The inflow port 50 is an opening provided on the side surface of the water tank 30 on the Z2 direction side. However, the opening position of the inflow port 50 is arbitrary as long as it opens to the Z2 direction side with respect to the partition wall portion 32 described later. The outflow port 52 is an outlet through which the added water W2 is discharged to the outside (here, the floc growth tank 16). The outflow port 52 is a groove provided at an end of the side surface of the water tank 30 on the Z1 direction side. It is preferable that the outflow port 52 is provided in the Z1 direction side with respect to the stirring blade 68 of the stirring part 40 mentioned later. However, the shape and position of the outflow port 52 are arbitrary as long as the outflow port 52 is provided on the Z1 direction side with respect to the partition wall 32 described later.

  As shown in FIGS. 2 and 3, the partition wall 32 is a wall-shaped (plate-shaped) member provided in the water tank 30. The partition wall portion 32 is provided closer to the Z1 direction than the bottom surface portion 30A of the water tank 30, and overlaps the bottom surface portion 30A when viewed from the direction along the Z direction. The partition wall 32 is provided on the Z2 direction side with respect to the outflow port 52, and is provided on the Z1 direction side with respect to the inflow port 50. The partition wall 32 divides the inside of the water tank 30 into a stirring space A1 and an inflow space A2. The stirring space A1 is a space on the side where the outflow port 52 inside the water tank 30 is provided, and is a space on the Z1 direction side of the partition wall 32. The inflow space A2 is a space on the Z2 direction side with respect to the stirring space A1 and on the side where the inflow port 50 is provided, and is a space on the Z2 direction side of the partition wall portion 32. In the present embodiment, the distance from the partition wall 32 to the end of the water tank 30 on the Z1 side is longer than the distance from the partition wall 32 to the bottom surface 30 </ b> A of the water tank 30. Accordingly, the stirring space A1 has a larger volume than the inflow space A2.

  Further, the partition wall 32 has an opening 35. The opening 35 penetrates from the surface 32A on the stirring space A1 side (direction Z1 side) of the partition wall 32 to the surface 32B on the inflow space A2 side (direction Z2 side) of the partition wall 32. Therefore, the opening 35 communicates the stirring space A1 and the inflow space A2. Therefore, the stirring space A1 is isolated from the inflow space A2 in the region where the partition wall 32 is provided, and communicates with the inflow space A2 in the region where the opening 35 opens.

  The opening 35 is a circular hole in the present embodiment, but the shape is not limited to this and is arbitrary. The center of the opening 35 is superimposed on the center axis AX of the water tank 30. The central axis AX is a central axis along the Z direction of the water tank 30. However, the center of the opening 35 may not be superimposed on the central axis AX, and may be at a position shifted from the central axis AX. The opening area of the opening 35 is also arbitrary.

  As shown in FIG. 2, the inflow pipe 34 is a pipe connected to the water tank 30, and more specifically, connected to the inflow port 50. The inflow pipe 34 allows the raw water W <b> 1 from the outside (here, the landing well 12) to flow into the water tank 30 through the inflow port 50. The inflow port 50 opens to the Z2 direction side, that is, the inflow space A2 side from the partition wall portion 32. Therefore, the inflow pipe 34 flows the raw water W1 into the inflow space A2. The inflow pipe 34 is connected to the flow rate adjustment unit 34A. The flow rate adjusting unit 34A adjusts the flow rate of the raw water W1 flowing from the inflow pipe 34 into the inflow space A2. The flow rate adjusting unit 34A is, for example, an on-off valve, and adjusts the flow rate of the raw water W1 by being controlled to open and close by the control unit 44.

  As shown in FIG. 2, the shielding portion 36 is a plate-like member that is provided in the stirring space A <b> 1 and is provided closer to the Z <b> 1 direction than the opening 35. The shielding part 36 is supported by the support part 60. The support part 60 is a shaft-like member extending in the Z1 direction from the end part 60A to the tip part 60B. The support portion 60 has a distal end portion 60 </ b> A that is the surface 32 </ b> A of the partition wall portion 32 and is disposed around the opening portion 35. A plurality of support portions 60 (four in the example of the present embodiment) are provided along the periphery of the opening 35. No member is provided between the support portions 60. That is, the space between the support portions 60 is open.

  The shielding unit 36 has a bottom surface 36 </ b> B attached to the tip 60 </ b> B of the support unit 60. In addition, as for the shielding part 36, the surface 36A is a surface by the side of the direction Z1, and the bottom face 36B is a surface by the side of the direction Z2. The shielding part 36 is located on the Z1 direction side with respect to the opening part 35, and is provided so as to overlap the opening part 35 when viewed from the direction along the Z direction. More specifically, as shown in FIG. 3, the shielding portion 36 overlaps the entire area of the opening 35 when viewed from the direction along the Z direction. That is, the shielding part 36 covers the entire area of the opening 35 on the Z1 direction side. The center of the shielding part 36 overlaps with the central axis AX of the water tank 30 and also overlaps with the central axis along the Z direction of the opening 35. However, the center of the opening 35 may not be superimposed on the central axis AX and the central axis along the Z direction of the opening 35, and may be at a position shifted from these.

  The shielding part 36 has an area of the surface (the bottom surface 36 </ b> B and the surface 36 </ b> A) larger than the opening area of the opening part 35. The area of the surface of the shielding part 36 is preferably 100% or more and 150% or less with respect to the opening area of the opening 35, but may be 50% (about) or more. Moreover, it is preferable that the area of the surface of the shielding part 36 is 80% or more with respect to the opening area of the opening part 35, and is 95% or less with respect to the diameter (one side of the water tank 30 in this embodiment) of the water tank 30. It is preferable that Moreover, although the shielding part 36 is circular in FIG. 3, the shape is arbitrary in this invention.

  The shielding part 36 configured as described above forms a communication space A3 between the opening part 35 and the shielding part 36. As shown in FIG. 2, the communication space A3 is a part of the stirring space A1, the end surface A3a on the Z1 direction side is shielded by the shielding portion 36, and the end surface A3b on the Z2 direction side is in the opening 35. Opposite. Further, in the communication space A3, a region A3c, which is a peripheral region on the side, is a region that connects the outer periphery of the opening 35 and the outer periphery of the shielding portion 36 along the Z direction. A part of the area A3c is shielded by the support part 60, but the area between the support parts 60 is open. That is, in the communication space A3, the end surface A3a is shielded from the stirring space A1 on the Z1 direction side of the shielding portion 36 by the shielding portion 36. The communication space A3 communicates with the inflow space A2 through the opening 35 on the end surface A3b. In addition, the communication space A3 communicates with the stirring space A1 that is radially outward when viewed from the central axis AX in the region A3c. Therefore, the communication space A3 communicates the inflow space A2 and the stirring space A1 between the end surface A3b and the region A3c while shielding the inflow space A2 and the stirring space A1 with the end surface A3a.

  In other words, the shielding part 36 opens the periphery (area A3c) of the side of the communication space A3 while shielding the Z1 direction side of the communication space A3, thereby connecting the inflow space A2 and the stirring space A1 to the communication space. It communicates via the periphery (area A3c) of the side of A3. The shielding part 36 is arranged so that the area of the open area A3c (the area A3c excluding the area shielded by the support part 60) is equal to or larger than the opening area of the opening 35. However, the present invention is not limited to this.

  As shown in FIGS. 2 and 3, the stationary blade portion 38 is provided on the surface 36 </ b> A of the shielding portion 36. The stationary blade portion 38 includes a plurality of plate members 64 </ b> A, 64 </ b> B, 64 </ b> C, and 64 </ b> D that are arranged in a line along the periphery of the center of the shielding portion 36. The plate portions 64A, 64B, 64C, and 64D extend in the radial direction. That is, the plate portions 64A, 64B, 64C, and 64D extend radially outward with respect to the central axis along the Z direction of the shielding portion 36. Specifically, the stationary blade portion 38 includes plate portions 64A, 64B, 64C, and 64D as shown in FIG. Here, of the directions along the X direction, one direction is defined as the X1 direction, and the direction opposite to the X1 direction is defined as the direction X2. In addition, one of the directions along the Y direction is defined as a Y1 direction, and a direction opposite to the Y1 direction is defined as a Y2 direction. The plate portion 64A is located on the X1 direction side and the Y1 direction side of the central axis AX, and extends along the Y direction. The plate portion 64B is located on the X1 direction side and the Y2 direction side with respect to the central axis AX, and extends along the direction X. The plate portion 64C is located on the X2 direction side and the Y2 direction side of the central axis AX, and extends along the Y direction. The plate portion 64D is located on the X2 direction side and the Y1 direction side from the central axis AX, and extends along the direction X. The plate portions 64A, 64B, 64C, and 64D are fixed to the surface 36A of the shielding portion 36 in this state and do not rotate, and constitute the stationary blade portion 38. Hereinafter, when the plate portions 64A, 64B, 64C, and 64D are not distinguished from each other, they are referred to as a plate portion 64. Although the number of plate portions 64 is four in this embodiment, the number is not limited to this.

  As shown in FIG. 2, the stirring unit 40 includes a rotating shaft portion 66 and a stirring blade 68. The rotation shaft portion 66 is a shaft-like member and is rotated by the control unit 44. The stirring blade 68 is composed of a plurality of plate-like members attached to the tip of the rotating shaft portion 66, and rotates with the rotation of the rotating shaft portion 66. The agitating unit 40 agitates the raw water W <b> 1 by rotating the agitating blade 68 by the rotation of the rotating shaft portion 66. However, the shape of the stirring unit 40 is arbitrary as long as the raw water W1 can be stirred. That is, the shape of the stirring blade 68 is arbitrary as long as it is a structure that generates a water flow in the raw water W1 by rotating.

  In the stirring unit 40, the stirring blade 68 is disposed in the stirring space A <b> 1 of the water tank 30. In the stirring unit 40, the stirring blade 68 is located on the Z1 direction side with respect to the stationary blade portion 38 and on the Z2 direction side with respect to the outlet port 52. The stirring unit 40 (stirring blade 68) is provided at a position overlapping the stationary blade unit 38 when viewed from the direction along the Z direction. Moreover, although it is preferable that the rotating shaft (center axis of the rotating shaft part 66) corresponds with the central axis AX, the stirring part 40 does not need to correspond.

  As shown in FIG. 2, the flocculant adding unit 42 is an apparatus that adds the flocculant P into the stirring space A <b> 1 of the water tank 30. The flocculant addition unit 42 adds the flocculant P to the raw water W1 in the stirring space A1 by adding the flocculant P into the stirring space A1 under the control of the control unit 44. The flocculant P is a chemical that agglomerates fine solid particles contained in the raw water W1, and is, for example, PAC (Polyaluminum chloride polyaluminum chloride), but is not limited thereto. The flocculant addition unit 42 adds the flocculant P to the raw water W1 in the stirring space A1, but is not limited thereto, and the flocculant P may be added to the raw water W1 in the inflow space A2 or the communication space A3. The flocculant P may be added to the raw water W1 in the inflow pipe 34.

(Operation of the stirring device)
Next, the operation of the stirring device 14, that is, the operation of adding the flocculant P to the raw water W1 and stirring it will be described. FIG. 4 is a schematic diagram for explaining the operation of the stirring device according to the present embodiment. As shown in FIG. 4, in the agitation device 14, the control unit 44 controls the flow rate adjustment unit 34 </ b> A so that the raw water W <b> 1 flows into the inflow space A <b> 2 of the water tank 30 through the inflow pipe 34. The control unit 44 continuously allows the raw water W1 to flow into the inflow space A2 (continuous operation), but may switch between inflow and stoppage of the raw water W1 (simple operation), for example. The control unit 44 controls the inflow amount of the raw water W1 so that the residence time of the raw water W1 in the water tank 30, that is, the time during which the raw water W1 remains in the water tank 30, is a predetermined time (for example, 1 minute or more and 5 minutes or less). adjust. Since the raw water W1 flows into the water tank 30 from the inflow pipe 34 and flows out from the outlet 52, the residence time can be set based on the inflow amount of the water tank 30 and the raw water W1.

  In the present embodiment, operations such as stirring by the stirring device 14 are started after sufficient raw water W1 has accumulated in the water tank 30. Even during the stirring operation, the inflow of the raw water W1 is continuously performed, and therefore the inflow and outflow of the raw water W1 are continued. In other words, the agitation device 14 stirs the added water W2 from the agitation space A1 while allowing the raw water W1 to flow into the inflow space A2, while the agitation agent 40 agitate the flocculant P at the aggregating agent addition part 42. Is added.

  The raw water W1 flowing into the inflow space A2 enters the communication space A3 through the opening 35 as shown in the water flow F1 of FIG. Then, the raw water W1 that has entered the communication space A3, as indicated by the water flow F1, is blocked by the shielding portion 36 in the flow path in the Z1 direction, flows radially outward with respect to the central axis AX, and is stirred through the region A3c. Enter the space A1.

  In addition, the control unit 44 operates the stirring unit 40 and rotates the stirring unit 40 while flowing the raw water W1. By rotating the stirring unit 40 in a state where the stationary blade unit 38 is disposed, an ascending water flow F2 and a descending water flow F3 are generated in the stirring space A1. The ascending water flow F2 is a water flow of the raw water W1 that is generated radially inside the stirring space A1. The ascending water flow F2 is a water flow that spirals in the Z1 direction from the stationary blade portion 38 toward the stirring portion 40 (stirring blade 68). And the descending water flow F3 is a water flow of the raw | natural water W1 which generate | occur | produces in the radial direction outer side rather than the ascending water flow F2 in stirring space A1. The lower precipitation flow F3 spirally extends from the periphery of the agitating unit 40 (the agitating blade 68), that is, from the outside in the radial direction of the agitating blade 68 to the periphery of the stationary blade portion 38, that is, from the outside of the stationary blade 38 in the radial direction. The water flow toward More specifically, the descending water flow F3 is directed from the stirring unit 40 (stirring blade 68) to the radially outer side (the inner wall on the side of the water tank 30), and from there toward the Z2 direction, along the inner wall on the side of the water tank 30. Flowing in a spiral. Then, the descending water flow F3 reaches the stationary blade portion 38 in the radial direction in the vicinity of the partition wall portion 32.

  The raw water W1 that has reached the stirring section 40 (stirring blade 68) by the rising water flow F2 is circulated by descending to the periphery of the stationary blade section 38 by the falling water flow F3. Further, the control unit 44 adds the coagulant P to the coagulant adding unit 42. Therefore, the flocculant P is dispersed in the raw water W1 by being caught in the descending water flow F3. The stirrer 14 generates the ascending water flow F2 and the descending water flow F3 in this manner, thereby generating a water flow in the entire water tank 30 and appropriately stirring even if the stirring speed and torque of the stirring unit 40 are reduced. It can be carried out. That is, the stirring device 14 can appropriately perform stirring with low power. A part of the water flow radially outward from the stirring unit 40 is a water flow F4. The water flow F4 goes to the direction Z1 side rather than the stirring part 40. FIG. By this water flow F4, the flocculant P is more effectively dispersed in the raw water W1. The raw water W1 that has been stirred in the stirring space A1 and in which the flocculant P is dispersed flows out from the outlet 52 to the outside (the floc growth tank 16) as added water W2.

  Further, when the raw water W1 that has flowed into the inflow space A2 enters the stirring space A1, the water flow is blocked by the shielding portion 36 and does not flow directly toward the stationary blade portion 38. Therefore, this stirring device 14 can suppress that the flow F1 of the raw water W1 flowing into the inflow space A2 inhibits the flow of the rising water flow F2 and the falling water flow F3. In addition, the water flow F1 joins the descending water flow F3 by entering the stirring space A1 from the region A3c. That is, the water flow F <b> 1 merges with the descending water flow F <b> 3 that has descended to the vicinity of the partition wall portion 32 and heads toward the stationary blade portion 38. That is, the raw water W1 that has flowed into the inflow space A2 and has not yet dispersed the flocculant P flows along the water flow F1 and merges with the descending water flow F3, whereby the flocculant P is dispersed. That is, the raw water W1 flowing into the inflow space A2 is suppressed from flowing out from the outlet 52 before the flocculant P is dispersed while suppressing the flow of the rising water flow F2 and the falling water flow F3. .

  In the above description, the agitation device 14 performs the agitation by adding the flocculant P to the inflowing raw water W1. However, the stirring device 14 is not limited to the raw water W1, and may be a device that adds the flocculant P to an arbitrary liquid and performs stirring, and an apparatus that performs stirring without adding the flocculant P to an arbitrary liquid. It may be.

  As described above, the stirring device 14 according to the present embodiment includes the water tank 30, the partition wall portion 32, the inflow pipe 34, the opening portion 35, the shielding portion 36, the stationary blade portion 38, and the stirring portion 40. Have The partition part 32 is provided in the water tank 30, and divides the inside of the water tank 30 into the stirring space A1 and the inflow space A2. The inflow space A2 is provided on the lower side in the vertical direction (Z2 direction side) than the stirring space A1. The inflow pipe 34 is connected to the water tank 30 and allows the raw water W1 (liquid) to flow into the inflow space A2. The opening 35 opens to the partition wall 32 and communicates the inflow space A2 and the stirring space A1. The shield 36 is provided in the stirring space A1 and above the opening 35 in the vertical direction (Z1 direction side) so as to overlap the opening 35 when viewed from the vertical direction (direction Z). The stationary blade portion 38 is provided on the upper surface 36A in the vertical direction of the shielding portion 36, and a plurality of plate-like members (plate portions 64) extend in the radial direction. The stirring unit 40 is provided in the stirring space A1 and above the stationary blade unit 38 in the vertical direction (Z1 direction side), and stirs the raw water W1 (liquid) in the stirring space A1. Further, the shielding part 36 opens the periphery (area A3c) on the side of the communication space A3 while shielding the upper side (end surface A3a) in the vertical direction of the communication space A3 between the shielding part 36 and the opening 35. The inflow space A2 and the stirring space A1 are communicated with each other via the periphery (region A3c) on the side of the communication space A3.

  The stirring device 14 separates the stirring space A1 and the inflow space A2. And the stirring apparatus 14 can generate the rising water flow F2 and the falling water flow F3 by providing the stationary blade part 38 and the stirring part 40 in the stirring space A1. Furthermore, the stirring device 14 is configured such that the raw water W1 (liquid) flows into the inflow space A2. The inflow space A2 communicates with the stirring space A1 through the opening 35, but the flow path from the inflow space A2 toward the stirring space A1 along the Z2 direction is blocked by the shielding unit 36. The shield 36 is located on the Z2 direction side with respect to the opening 35. Therefore, the flow path communicating from the inflow space A2 to the stirring space A1 becomes a communication space A3 between the shielding portion 36 and the opening 35, and is introduced into the stirring space A1 through the region A3c of the communication space A3. . Therefore, the stirring device 14 can suppress directing toward the stationary blade portion 38 through the communication space A3 when the raw water W1 from the inflow space A2 flows into the stirring space A1. In the stirring space A1, the flow of the ascending water flow F2 and the descending water flow F3 is inhibited from being inhibited. Therefore, the stirring device 14 can promote stirring by the rising water flow F2 and the falling water flow F3, and can be appropriately stirred with low power. Thus, the stirring device 14 can appropriately mix and uniformly disperse with low power when stirring is performed while flowing the liquid (raw water W1).

  Further, when the raw water W1 is purified to obtain the clean water W5, the flocculant P is added to the water tank 30 to which the flocculant P is added while the raw water W1 is allowed to flow from the bottom and the raw water W1 continues to flow. However, the structure may be such that stirring is performed. In this way, when used for the clean water W5, if this stirring device 14 is used, it becomes possible to provide the stationary blade portion 38 and the stirring portion 40 in the stirring space A1 and appropriately stir with low power. Purification of the clean water W5 can be performed particularly appropriately. Moreover, it becomes possible to reduce electric power and the size of the stirring part 40 by setting it as low power.

  Further, the stirring device 14 has an outlet 52. The outflow port 52 is provided above the stirring part 40 (stirring blade 68) in the vertical direction (Z1 direction side), and allows the liquid in the stirring space A1 to flow out to the outside. Since the outflow port 52 is provided on the Z1 direction side of the stirring unit 40, the raw water W1 flowing in from the inflow space A2 is caught in the water flow generated between the stirring unit 40 and the stationary blade unit 38. It is prevented from flowing out from the outlet 52 before. Therefore, the stirring device 14 prevents the raw water W1 flowing in from the inflow space A2 from flowing out before being sufficiently stirred.

  Further, the shielding part 36 overlaps the entire area of the opening 35 when viewed from the vertical direction (Z direction). Since this shielding part 36 completely covers the opening 35 along the Z direction, the raw water W1 flowing in from the inflow space A2 is more appropriately suppressed from obstructing the flow of the rising water flow F2 and the falling water flow F3. can do.

  Further, the shielding part 36 has an area of the area around the side of the open communication space A3 (area A3c) equal to or larger than the opening area of the opening 35. The shielding part 36 sets the area of the region A3c, which is a flow path to the stirring space A1, to be equal to or larger than the opening area of the opening 35, so that the raw water W1 from the inflow space A2 flows when flowing into the stirring space A1. Fluctuations can be suppressed, and the water flow can be made smooth.

  Further, the agitating unit 40 agitates the liquid (raw water W1) in the agitating space A1, thereby generating an ascending water flow F2 and a descending water flow F3. The rising water flow F <b> 2 is a water flow that rises spirally from the stationary blade portion 38 toward the stirring portion 40. The lower precipitation stream F3 is a water stream that descends spirally from the periphery of the stirring unit 40 toward the periphery of the stationary blade unit 38 and flows to the stationary blade unit 38. The stirring device 14 joins the water flow F1 of the raw water W1 flowing in from the inflow space A2 through the opening 35 to the descending water flow F3. The stirring device 14 can prevent the raw water W1 from flowing out without being sufficiently stirred by joining the raw water W1 flowing in from the inflow space A2 with the descending water flow F3.

  Moreover, the stirring apparatus 14 has the flocculant addition part 42 which adds the flocculant P to a liquid (raw water W1). The stirring device 14 can appropriately disperse the flocculant P in the liquid by stirring the liquid while adding the flocculant P by the flocculant addition unit 42.

  Moreover, the water treatment system 100 according to the present embodiment is a water treatment system for clean water having a stirring device 14. Since the water treatment system 100 includes the agitation device 14, when water treatment is performed on clean water, it can be appropriately mixed and uniformly dispersed with low power.

  In addition, the stirring apparatus 14 demonstrated above can also be made into the shape like FIG. 5, FIG. 6, for example. FIG. 5 is a schematic diagram illustrating another example of the shape of the shielding portion. FIG. 6 is a schematic diagram illustrating another example of the shape of the stationary blade portion. As shown in FIG. 5, the shielding portion 36 </ b> A is a rectangular plate-like member unlike the shielding portion 36 described above. As described above, the shielding portion may be circular, rectangular, or other shape as long as it overlaps the opening 35 along the vertical direction (covers the opening 35). May be. As shown in FIG. 6, the stationary blade portion 38 </ b> A may have a shape of the plate portion 64 a different from that of the above-described plate portion 64. The plate portion 64a extends in the radial direction from the one end portion 64a1 toward the other end portion 64a2, similarly to the plate portion 64. However, the plate portion 64Aa is curved from one end portion 64a1 to the other end portion 64a2. Thus, as for the stationary blade part 38, if the board part 64 is extended in the radial direction, the shape of the board part 64 is arbitrary.

  As mentioned above, although embodiment of this invention was described, embodiment is not limited by the content of these embodiment etc. In addition, the above-described constituent elements include those that can be easily assumed by those skilled in the art, those that are substantially the same, and those in a so-called equivalent range. Furthermore, the above-described components can be appropriately combined. Furthermore, various omissions, substitutions, or changes of the constituent elements can be made without departing from the spirit of the above-described embodiments and the like.

DESCRIPTION OF SYMBOLS 14 Stirrer 16 Flock growth tank 30 Water tank 32 Partition part 34 Inflow pipe 35 Opening part 36 Shielding part 38 Stator blade part 40 Stirrer part 42 Coagulant addition part 44 Control part 50 Inlet 52 Outlet A1 Stirring space A2 Inflow space A3 Communication Space W1 Raw water W2 Water added

Claims (7)

A tank,
A partition wall section provided in the water tank and divided into an agitation space and an inflow space provided below the agitation space in the vertical direction;
An inflow pipe connected to the aquarium and allowing liquid to flow into the inflow space;
An opening that opens to the partition and communicates the inflow space and the agitation space;
A shielding portion provided in the stirring space and above the opening in the vertical direction so as to overlap the opening as viewed from the vertical direction;
A stationary blade portion provided on the upper surface in the vertical direction of the shielding portion, and a plurality of plate-like members extending in the radial direction;
A stirring unit that is provided in the stirring space and above the stationary blade portion in a vertical direction, and stirs the liquid in the stirring space;
Have
The shielding portion shields the upper side in the vertical direction of the communication space, which is a space between the shielding portion and the opening, and opens the periphery of the side of the communication space to thereby form the inflow space and the stirring space. To communicate with each other through the side periphery of the communication space,
Stirring device.   The stirring device according to claim 1, further comprising an outlet provided above the stirring unit in a vertical direction and allowing the liquid in the stirring space to flow out to the outside.   The stirring device according to claim 1 or 2, wherein the shielding portion overlaps the entire area of the opening as viewed from the vertical direction.   The said shielding part makes the area of the area | region of the side periphery of the said communicating space open | released the area more than the opening area of the said opening part, The any one of Claims 1-3 Stirring device.   The stirrer stirs the liquid in the stirrer space, so that an ascending water flow that spirally rises from the stationary blade portion toward the stirrer portion, and from the periphery of the stirrer portion to the periphery of the stationary blade portion. 2. A descending water flow that spirally descends toward the stationary blade portion is generated, and the liquid water flow that flows in from the inflow space through the opening is joined to the descending water flow. The stirrer according to any one of claims 1 to 4.   The stirrer according to any one of claims 1 to 5, further comprising a flocculant addition unit that adds a flocculant to the liquid.   The water treatment system in clean water which has the stirring apparatus of any one of Claims 1-6.

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