JP6560386B1 - Stirring device and water treatment system in clean water - Google Patents

Abstract

When stirring is performed while a liquid is introduced, mixing and uniform dispersion can be appropriately performed with low power. A stirrer 14 includes a water tank 30, a partition wall 32 provided in the water tank 30, and divided into an agitating space A1 and an inflow space A2 provided vertically below the agitating space A1, and a water tank 30. Are connected to the inflow space A2, and the partition wall 32 is provided with the inflow pipe 34, the opening 62 communicating with the inflow space A2 and the stirring space A1, and the upper surface 32a of the partition wall 32 in the vertical direction. And a stationary blade portion 66 provided radially outward from the opening 62 and having a plurality of plate-like members extending in the radial direction, and in the stirring space A1 and in the vertical direction from the opening 62. An agitation part 72 is provided above the opening 62 so as to overlap with the opening 62 when viewed from the vertical direction, and agitates the liquid in the agitation space A1. [Selection] Figure 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 need for a stirring device that can achieve uniform mixing and dispersing action efficiently with low power.

  In a conventional stirring apparatus, a turbine blade and a paddle blade have 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 and 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. The technique which stirs a slurry and a liquid by low power by arrange | positioning and stirring with the stirring apparatus provided in the upper part of the stirring tank is described.

Japanese Patent Laid-Open No. 7-60093

  However, in the case of stirring the clean water, it is necessary to perform stirring while allowing the raw water to continuously flow into the stirring tank. In such a case, in the configuration of Patent Document 1, 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 provides a stirrer that can appropriately stir with low power and a water treatment system in clean water when stirring is performed while flowing a liquid. Objective.

  In order to solve the above-described problems and achieve the object, a stirrer according to the present disclosure includes a water tank, the water tank, a stirring space, and an inflow space that is provided vertically below the stirring space. A partition wall section 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 provided in the partition wall section that communicates the inflow space and the agitation space; and the partition wall section A stationary blade portion provided on a radially upper side of the opening and radially outward of the opening, and a plurality of plate-like members extending in the radial direction, and in the stirring space and the opening And a stirring unit that is provided above the vertical direction so as to overlap the opening as viewed from the vertical direction and stirs the liquid in the stirring space.

  It is preferable to have a cylindrical portion that is provided over the entire periphery of the opening and extends vertically upward from the periphery of the opening.

  The partition wall is provided with a hole penetrating from the upper surface in the vertical direction to the lower surface in the vertical direction, and further includes a plate portion disposed on the upper surface in the vertical direction of the partition wall, The opening communicates with the hole by penetrating from the upper surface in the vertical direction to the lower surface in the vertical direction of the plate portion, thereby communicating the inflow space and the stirring space. The plate portion extends upward in the vertical direction from the outer periphery of the opening on the upper surface in the vertical direction of the plate portion, and the stationary blade portion is radially outward from the tube portion on the upper surface in the vertical direction of the plate portion. It is preferable to be provided.

  It is preferable to have a baffle plate portion that is provided above the stirring portion in the vertical direction and overlaps at least a part of the stirring portion when viewed from the vertical direction.

  The stirring section spirals from the stationary blade section toward the stirring section by stirring the liquid in the stirring space while receiving the water flow of the liquid flowing in from the inflow space through the opening. It is preferable to generate an ascending water flow that rises in a shape and a descending water flow that spirally descends from the periphery of the stirring portion toward the periphery of the stationary blade portion and flows to the stationary blade portion.

  It is preferable to further include an outlet provided above the stirring unit in the vertical direction and outflowing the liquid in the stirring space to the outside.

  It is preferable to have a flocculant addition part for adding a flocculant to the liquid.

  In order to solve the above-described problems and achieve the object, a stirrer according to the present disclosure includes a water tank, the water tank, a stirring space, and an inflow space that is provided vertically below the stirring space. A partition wall section that is divided into a water tank, an inflow pipe that is connected to the water tank and allows liquid to flow into the inflow space, and a vertical upper surface of the partition wall section, and a plurality of plate-like members extend in the radial direction. A plurality of openings communicating with the inflow space and the stirring space through the stationary blade portion, the vertical upper surface of the partition wall portion to the lower surface of the partition wall, and the stirring space And a stirring portion that is provided above the opening in the vertical direction and stirs the liquid in the stirring space.

  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 agitation device.

  ADVANTAGE OF THE INVENTION According to this invention, when stirring is performed in flowing a liquid, it can stir appropriately with low power.

FIG. 1 is a schematic block diagram of a water treatment system according to the first embodiment. FIG. 2 is a schematic diagram of the stirring device according to the first embodiment. FIG. 3 is a schematic diagram of the stirring device according to the first embodiment. FIG. 4 is a schematic diagram for explaining the operation of the stirring device according to the first embodiment. FIG. 5 is a schematic view of a stirring device according to the second embodiment. FIG. 6 is a schematic view of a stirring device according to the second embodiment. FIG. 7 is a schematic diagram of a stirring device according to a third embodiment. FIG. 8 is a schematic view of a stirring device according to the fourth embodiment. FIG. 9 is a schematic diagram of a stirring device according to the fifth embodiment. FIG. 10 is a schematic diagram of a stirring device according to the fifth embodiment.

  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.

(First embodiment)
(Configuration of water treatment system)
First, the first embodiment will be described. FIG. 1 is a schematic block diagram of a water treatment system according to the first 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 38 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 first 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 32, an inflow pipe 34, a communication unit 36, a stirring unit 38, a flocculant addition unit 40, and a control unit 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).

  2 and 3, the water tank 30 is a water tank into which raw water W1 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. The water tank 30 has a bottom surface portion 30A and a side wall portion 30B. The bottom surface portion 30 </ b> A is the bottom surface of the water tank 30. The side wall portion 30B is provided along the outer periphery of the bottom surface portion 30A, and extends upward in the vertical direction from the outer periphery of the bottom surface portion 30A. Hereinafter, the Z direction is the vertical direction, and the central axis of the water tank 30 along the Z direction is the central axis AX. Further, a radial direction centered on the central axis AX and a direction away from the central axis AX, that is, a direction outside the radial direction is defined as an R1 direction. A direction that is a radial direction around the central axis AX and approaches the central axis AX, that is, a direction inside the radial direction is defined as an R2 direction. Further, the direction along the Z direction and directed upward in the vertical direction (the direction away from the ground surface) is defined as the Z1 direction, and the direction along the Z direction and directed downward in the vertical direction (the direction toward the ground surface). Is the Z2 direction.

  The water tank 30 has a width, that is, a distance between the side wall portions 30B facing each other, and 3 m, and a length along the Z direction, that is, the height of the side wall portion 30B is 4 m. However, the length of each direction of the water tank 30 is an example and is arbitrary.

  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 at a location on the Z2 direction side of the side wall 30 </ b> B of the water tank 30. 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 outlet 52 is a groove provided at the end of the side wall 30 </ b> B 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 part 72 of the stirring unit 38 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 portion 32 to the end of the side wall portion 30B on the Z1 direction side is longer than the distance from the partition wall portion 32 to the bottom surface portion 30A of the water tank 30. Accordingly, the stirring space A1 has a larger volume than the inflow space A2.

  Further, a hole 56 is opened in the partition wall 32. The hole 56 penetrates from the surface 32a on the stirring space A1 side (Z1 direction side) of the partition wall portion 32 to the surface 32b on the inflow space A2 side (Z2 direction side) of the partition wall portion 32. The central axis of the hole 56 is the central axis AX. Accordingly, the partition wall portion 32 does not overlap the region where the hole portion 56 is opened in the entire area of the bottom surface portion 30A of the water tank 30 as viewed from the Z direction, and is on the R1 direction side (radially outward) from the hole portion 56. It is superimposed on the area. In addition, in this embodiment, although the hole part 56 is a circular hole, a shape is not restricted to this but is arbitrary. Further, the central axis of the hole portion 56 may be at a position shifted from the central axis AX. Moreover, the opening area of the hole part 56 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 adjustment 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 42.

  As shown in FIG. 2, the communication unit 36 includes a plate part 60, a cylinder part 64, a stationary blade part 66, and a fixing part 68. The plate part 60 is a plate-like member. The plate portion 60 is installed on the surface 32a of the partition wall portion 32 so that one surface 60a is a surface on the Z1 direction side and the other surface 60b is a surface on the Z2 direction side. That is, the plate part 60 is disposed such that the surface 60 b is in contact with the surface 32 a of the partition wall part 32. In addition, since the length along the R1 direction is longer than the length along the R1 direction of the hole portion 56, the plate portion 60 occupies the R1 direction side from the hole portion 56. As shown in FIG. 3, the plate portion 60 has a circular shape, but the shape is not limited thereto, and may be, for example, a rectangular shape.

  Further, as shown in FIG. 2, an opening 62 is opened in the plate portion 60. The opening 62 penetrates from one surface 60a of the plate portion 60 to the other surface 60b. The opening 62 opens so as to overlap the center of the plate part 60. In other words, the plate portion 60 is opened by the opening 62 in the radially inner region. In addition, although the opening part 62 is a circular hole, a shape is not restricted to it, For example, a rectangular hole may be sufficient.

  As shown in FIG. 2, the plate part 60 is attached to the partition wall part 32 so that the center of the opening part 62 is the central axis AX. The opening 62 overlaps with the hole 56 of the partition wall 32 as viewed from the Z direction and communicates with the hole 56. In other words, the opening 62 is provided in the partition wall 32 through the plate part 60 and communicates with the hole 56 so as to communicate the stirring space A1 and the inflow space A2. Thus, the stirring space A1 is separated from the inflow space A2 in the region on the R1 direction side from the opening 62, and communicates with the inflow space A2 in the region where the opening 62 opens.

  The diameter of the opening 62, that is, the length along the R1 direction is defined as a diameter D1. Further, the diameter of the hole 56, that is, the length along the R1 direction is defined as a diameter D0. In this case, the diameter D1 is smaller than the diameter D0. The opening 62 may be provided so as to communicate with the hole 56, and the center of the opening 62 may be shifted from the central axis AX. Moreover, as long as the opening part 62 is provided in the R2 direction side (radial direction inner side) rather than the cylinder part 64 and the stationary blade part 66 which are mentioned later, you may be provided with two or more.

  As shown in FIG. 2, the cylindrical portion 64 is a cylindrical member provided on the surface 60 a of the plate portion 60. One end portion 64 a of the cylindrical portion 64 is grounded to the surface 60 a and is provided along the outer periphery of the opening 62. And the cylinder part 64 is extended in the direction away from the surface 60a from the one end part 64a to the other end part 64b, ie, the Z1 direction side. The cylindrical portion 64 has one end portion 64 a communicating with the opening portion 62. Therefore, in the cylindrical portion 64, the internal space 64c communicates from one end portion 64a (opening portion 62) to the other end portion 64b. In other words, the cylinder part 64 is opening so that the opening part 62 may be connected to stirring space A1 and inflow space A2, enclosing the outer periphery of the opening part 62. FIG. In addition, although the cylinder part 64 is a cylindrical cylinder, if a cylindrical shape which both ends open, a shape is not restricted to it. Moreover, it is preferable that the length along the R1 direction, ie, an internal diameter, is constant from the one end part 64a to the other end part 64b. However, the cylindrical portion 64 may have an inner diameter that decreases as it goes toward the other end portion 64b, or may increase as it goes toward the other end portion 64b.

  As shown in FIGS. 2 and 3, the stationary blade portion 66 is provided on the surface 60 a of the plate portion 60. The stationary blade part 66 is provided on the R1 direction side of the cylindrical part 64. More specifically, as shown in FIG. 3, the stationary blade portion 66 includes a plurality of plate portions 66 a, 66 b, 66 c, and 66 d that are arranged along the outer periphery of the cylindrical portion 64. The plate portions 66a, 66b, 66c, and 66d extend from the respective positions on the outer periphery of the cylindrical portion 64 toward the R1 direction. One end of each of the plate portions 66a, 66b, 66c, and 66d is connected to the outer periphery of the cylindrical portion 64, but may be separated from the cylindrical portion 64.

  The arrangement of the plate portions 66a, 66b, 66c, 66d will be described in more detail. As shown in FIG. 3, a predetermined direction orthogonal to the Z direction is defined as an X1 direction, and a direction opposite to the X1 direction is defined as an X2 direction. A direction orthogonal to the Z direction and the X1 direction is defined as a Y1 direction, and a direction opposite to the Y1 direction is defined as a Y2 direction. That is, the R1 direction and the R2 direction are radial directions with respect to the Z direction, while the X1, X2, Y1, and Y2 directions are directions in the three-dimensional coordinates. In this case, the plate portion 66a is located on the X1 direction side and the Y1 direction side of the central axis AX, and extends along the Y1 direction. The plate portion 66b is located on the X1 direction side and the Y2 direction side of the central axis AX, and extends along the X1 direction. The plate portion 66c is located on the X2 direction side and the Y2 direction side from the central axis AX, and extends along the Y2 direction. The plate portion 66d is located on the X2 direction side and the Y1 direction side from the central axis AX, and extends along the X direction. As described above, the plate portions 66a, 66b, 66c, and 66d extend in the radial direction (R1 direction) of the central axis AX, but are arranged at positions slightly shifted from the positions along the radial direction. Yes.

  The plate portions 66a, 66b, 66c, and 66d are fixed to the surface 60a of the plate portion 60 in such a state and do not rotate, and constitute a stationary blade portion 66. The stationary blade portion 66 is configured by the four plate portions 66a, 66b, 66c, and 66d as described above, but the number of plate portions is not limited thereto.

  As shown in FIGS. 2 and 3, the fixing portion 68 is a fixing tool that is attached to the surface 60 a of the plate portion 60 and fixes the plate portion 60 to the partition wall portion 32. The fixing part 68 fixes the plate part 60 to the partition part 32 by being inserted into holes provided in the plate part 60 and the partition part 32, for example. Furthermore, the fixing portion 68 may be a bolt, and is screwed into a screw hole provided in the plate portion 60 and the partition wall portion 32 so that the plate portion 60 is fixed to the partition wall portion 32. Good. The fixing portion 68 is provided on the R1 direction side of the opening 62, more specifically, the stationary blade portion 66. In the present embodiment, four fixing portions 68 are provided, but the number thereof is arbitrary.

  Further, a discharge hole 58 is opened in the plate part 60. The discharge hole 58 is on the R1 direction side with respect to the cylinder part 64 and opens in the region of the hole part 56, and penetrates from the surface 60 a to the surface 60 b of the plate part 60. Further, the diameter of the discharge hole 58 is smaller than the diameter of the hole 56. The discharge hole portion 58 has a function of discharging water accumulated in a stirring space A1, more specifically, a space surrounded by a cylinder portion 64, a partition wall portion 32, and a side wall portion 30B, which will be described later, into the inflow space A2 during maintenance. . Further, the discharge hole 58 may be blocked by a plug when the stirring device 14 is operated, and may be opened by being plugged during maintenance. However, the discharge hole portion 58 may be provided not in the plate portion 60 but in the partition wall portion 32 and may penetrate from the surface 32a to the surface 32b. Further, the discharge hole portion 58 is not necessarily provided.

  The communication unit 36 is configured as described above.

  As shown in FIG. 2, the stirring unit 38 has a rotating shaft part 70 and a stirring part 72. The rotation shaft portion 70 is a shaft-like member and is rotated by the control unit 42. The stirring unit 72 is a wing-like member composed of a plurality of plate-like members attached to the tip of the rotating shaft part 70. The stirring unit 72 rotates integrally with the rotation shaft unit 70 by the rotation of the rotation shaft unit 70. The agitation unit 38 agitates the raw water W <b> 1 by rotating the agitation unit 72 by the rotation of the rotation shaft unit 70. However, the shape of the stirring unit 38 is arbitrary as long as the raw water W1 can be stirred. That is, the shape of the stirring unit 72 is arbitrary as long as the stirring unit 72 is configured to generate a water flow in the raw water W1 by rotating.

  The stirring unit 38 is arranged in the water tank 30 such that the central axis of the rotating shaft part 70 coincides with the central axis AX and the stirring part 72 is arranged in the stirring space A1 of the water tank 30. The stirring unit 72 of the stirring unit 38 is located on the Z1 direction side of the communication unit 36, that is, the opening 62, and on the Z2 direction side of the outlet port 52. The stirring unit 72 is provided at a position overlapping the opening 62 when viewed from the direction along the Z direction. As long as the stirring unit 72 overlaps the opening 62 as viewed from the Z direction, the central axis of the rotation shaft unit 70 does not have to coincide with the central axis AX.

  Here, the outer diameter of the stirring unit 72, that is, the length along the R1 direction is defined as a diameter D2. And let the outer diameter of the stationary blade part 66, ie, the length along the R1 direction, be the diameter D3. In this case, the diameter D1 of the opening 62 is preferably smaller than the diameter D2 of the stirring unit 72. The diameter D1 is about 2/3 the length of the diameter D2, but the length ratio is not limited thereto. Moreover, although the diameter D3 of the stationary blade part 66 is longer than the diameter D2 of the stirring part 72, the length may be equal to or less than the diameter D2.

  As shown in FIG. 2, the flocculant addition unit 40 is an apparatus that adds the flocculant P into the stirring space A <b> 1 of the water tank 30. The flocculant addition unit 40 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 42. 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 40 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 inflow pipe 34. The flocculant P may be added to the raw water W1.

(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 first embodiment. As shown in FIG. 4, in the stirring device 14, the control unit 42 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 42 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 (intermittent operation), for example. The control unit 42 adjusts 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. The predetermined time of the residence time is preferably 1 minute or more and 5 minutes or less. In addition, since raw | natural water W1 flows in into the water tank 30 from the inflow pipe 34, and flows out outside from the outflow port 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. That is, the agitation device 14 stirs the flocculant P at the flocculant addition unit 40 while stirring the stirrer unit 38 in a state where the raw water W1 is flowing into the inflow space A2 and the added water W2 is flowing out of the agitation space A1. Is added.

  The raw water W1 that has flowed into the inflow space A2 flows into the stirring space A1 through the hole 56 and the opening 62 as shown in the inflow water flow F1 in FIG. The inflow water flow F1 is a water flow from the opening 62 to the stirring unit 72 in the Z1 direction. Here, since the opening 62 is a hole penetrating from the surface 60a to the surface 60b of the plate portion 60, it can be said that the opening 62 extends in the Z direction. Accordingly, the raw water W1 that has flowed into the inflow space A2 flows toward the Z1 direction when flowing into the opening 62. Therefore, the raw water W1 flowing into the stirring space A1 through the opening 62 flows in the Z1 direction as shown in the inflowing water flow F1. Furthermore, since the cylinder part 64 is provided around the opening part 62, the raw water W1 flows from the opening part 62 through the space 64c inside the cylinder part 64 into the stirring space A1. Therefore, the raw water W1 is rectified more effectively so as to flow in the Z1 direction in the internal space 64c.

  A stirring unit 72 is provided on the Z1 direction side of the opening 62. Therefore, the raw water W1 that has flowed into the stirring space A1 through the opening 62 and the internal space 64c flows in the Z1 direction toward the stirring portion 72 as shown in the inflowing water flow F1.

  In addition, the control unit 42 operates the stirring unit 38 while causing the raw water W1 to flow in, and rotates the stirring unit 72. By rotating the stirring part 72 in a state where the stationary blade part 66 is arranged, an ascending water flow F2 and a descending water flow F3 are generated in the stirring space A1. The rising water flow F2 is a water flow of the raw water W1 generated in the R1 direction side (radially outward) from the inflow water flow F1 and in the R2 direction side (radial inner side) than the descending water flow F3 in the stirring space A1. The ascending water flow F2 is a water flow that spirals in the Z1 direction from the stationary blade portion 66 toward the stirring portion 72.

  The lower precipitation stream F3 is a stream of the raw water W1 generated on the R1 direction side (radially outer side) than the rising water stream F2 in the stirring space A1. The lower precipitation stream F3 is a water flow spirally extending in the Z2 direction from the periphery of the stirring portion 72, that is, the R1 direction side of the stirring portion 72, to the periphery of the stationary blade portion 66, that is, the R1 direction side of the stationary blade portion 66. . More specifically, the descending water flow F3 flows spirally along the side wall portion 30B from the stirring portion 72 toward the R1 direction side, that is, toward the side wall portion 30B of the water tank 30, and from there toward the Z2 direction. Then, the descending water flow F3 is directed to the R2 direction side in the vicinity of the partition wall portion 32 and reaches the stationary blade portion 66.

  The raw water W1 that has flowed in from the inflow space A2 by the inflowing water flow F1 and has reached the stirring unit 72 is circulated by descending to the periphery of the stationary blade portion 66 by the descending water flow F3. Similarly, the raw water W1 that has reached the stirring section 72 by the rising water flow F2 is circulated by descending to the periphery of the stationary blade section 66 by the falling water flow F3. Further, the control unit 42 causes the coagulant adding unit 40 to add the coagulant P. 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 72 are reduced. It can be carried out. That is, the stirring device 14 can appropriately perform stirring with low power.

  Moreover, since the raw | natural water W1 which flows in from inflow space A2 goes to the stirring part 72 by the inflow water flow F1 as mentioned above, it is caught in the descending water flow F3 and is stirred appropriately in the stirring space A1. Therefore, according to this stirring device 14, the so-called short path in which the raw water W1 flowing from the inflow space A2 flows out toward the outlet 52 without being stirred can be suppressed. When the flow of the raw water W1 is fast, such as when the residence time is 1 to 1.5 minutes, the risk of a short path increases if the flow direction of the raw water W1 flowing from the inflow space A2 is not rectified. On the other hand, since the stirring device 14 rectifies the raw water W1 toward the stirring unit 72 as described above, even when the residence time is short and the flow is fast, the short path can be appropriately suppressed. Moreover, since the inflow water flow F1 becomes a different path | route from the downward precipitation flow F3 of the radial direction outer side, it can collide with the downward water flow F3 and can suppress the obstruction | occlusion of the flow of the downward water flow F3.

  By suppressing the short path in this way, the raw water W1 in which the flocculant P is not yet dispersed flows along the inflow water flow F1 and joins the descending water flow F3. Therefore, according to the stirring device 14, the flocculant P can be appropriately dispersed in the raw water W1. 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.

  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 62, the stationary blade portion 66, and the stirring portion 72. 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 in the Z2 direction (vertical direction lower side) than the stirring space A1. Moreover, the inflow pipe 34 is connected to the water tank 30, and flows the raw water W1 into the inflow space A2. The opening 62 is provided in the partition wall 32 and communicates the inflow space A2 and the stirring space A1. The stationary blade portion 66 is a surface 32 a on the upper side in the vertical direction of the partition wall portion 32, and is provided on the Z1 direction side (radially outward side) of the opening 62. In the stationary blade portion 66, plate portions 66a, 66b, 66c, 66d, that is, a plurality of plate-like members extend in the radial direction. The stirring unit 72 is provided in the stirring space A1 on the Z1 direction side (vertical upper side) with respect to the opening 62, and is provided so as to overlap the opening 62 when viewed from the Z direction (vertical direction). It is done. The stirring unit 72 stirs the raw water W1 in the stirring space A1.

  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 66 and the stirring part 72 in the stirring space A1. Furthermore, the stirring device 14 is configured such that the raw water W1 flows into the inflow space A2. The inflow space A2 communicates with the stirring space A1 through the opening 62. Since the opening 62 overlaps with the stirring unit 72 when viewed from the Z direction, the raw water W1 flowing into the stirring space A1 through the opening 62 flows toward the stirring unit 72. Accordingly, the raw water W1 that has flowed into the stirring space A1 is caught in the descending water flow F3 without being directly discharged from the outlet 52, and is appropriately stirred. Therefore, the stirring device 14 can suppress a short pass while appropriately stirring with low power in the rising water flow F2 and the falling water flow F3.

  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 66 and the stirring portion 72 in the stirring space A1 so that the stirring can be appropriately performed with low power. Purification of the clean water W5 can be performed particularly appropriately. Moreover, it becomes possible to reduce electric power and to reduce the size of the stirring part 72 by setting it as low power.

  Further, the stirring device 14 has a cylindrical portion 64. The cylinder part 64 is provided on the outer periphery of the opening 62 over the entire circumference, and extends from the outer periphery of the opening 62 upward in the vertical direction (Z1 direction). Since the cylindrical portion 64 extends vertically upward, the raw water W1 flowing into the stirring space A1 can be flowed to the inside so that the raw water W1 can be rectified more appropriately toward the stirring portion 72. In addition, the stirring apparatus 14 does not necessarily need to have the cylinder part 64 as long as the opening part 62 is provided.

  Further, the partition wall 32 is provided with a hole 56 penetrating from the surface 32a to the surface 32b. And the stirring apparatus 14 has the board part 60. FIG. The plate part 60 is disposed on the surface 32 a of the partition wall part 32. Further, the opening 62 penetrates from the surface 60 a on the upper side in the vertical direction of the plate 60 to the surface 60 b on the lower side in the vertical direction, and communicates with the hole 56. Thereby, the opening part 62 connects the inflow space A2 and the stirring space A1. The cylinder portion 64 extends upward in the vertical direction from the outer periphery of the opening 62 on the surface 60 a of the plate portion 60. Further, the stationary blade portion 66 is provided on the R1 direction side of the surface 60a of the plate portion 60 with respect to the cylindrical portion 64. In the stirring device 14, the plate portion 60, the cylindrical portion 64, and the stationary blade portion 66 are integrally provided as the communication unit 36 and attached to the partition wall portion 32. An opening 62 is opened in the plate portion 60. Therefore, it becomes possible to make the structure of the stirring device 14 only by attaching the plate portion 60 to the facility having the water tank 30 and the partition wall portion 32. Therefore, according to the structure of the board part 60, the structure of the stirring apparatus 14 is easily realizable with respect to the existing installation.

  In addition, the agitating unit 72 agitates the raw water W1 in the agitating space A1 while receiving the inflowing water flow F1 of the raw water W1 that has flowed in from the inflow space A2 through the opening 62, whereby the rising water flow F2 and the descending water flow F3. And generate. The rising water flow F <b> 2 rises spirally from the stationary blade portion 66 toward the stirring portion 72. The lower precipitation stream F <b> 3 descends spirally from the periphery of the stirring unit 72 toward the periphery of the stationary blade unit 66 and flows to the stationary blade unit 66. Since the agitating unit 72 receives the incoming water flow F1 of the raw water W1 from the opening 62, the raw water W1 can be appropriately involved in the descending water flow F3. Therefore, according to this stirring apparatus 14, a short pass can be suppressed appropriately.

  Further, the stirring device 14 has an outlet 52. The outflow port 52 is provided above the stirring part 72 in the vertical direction (Z1 direction side), and causes the added water W2 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 72, the raw water W1 flowing in from the inflow space A2 is caught in the water flow generated between the stirring unit 72 and the stationary blade unit 66. It is prevented from flowing out from the outlet 52 before. Therefore, according to this stirring apparatus 14, a short pass can be suppressed appropriately.

  Moreover, the stirring apparatus 14 has the flocculant addition part 40 which adds the flocculant P to raw | natural water W1. The stirring device 14 can appropriately disperse the flocculant P in the raw water W1 by stirring the raw water W1 while adding the flocculant P by the flocculant addition unit 40.

  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 this water treatment system 100 includes the agitation device 14, the water treatment system 100 can appropriately agitate with low power when performing water treatment of clean water.

(Second Embodiment)
Next, a second embodiment will be described. The stirring device 14A according to the second embodiment is different from the first embodiment in that the stirring unit 38A has a baffle plate portion 74. In the second embodiment, description of portions having the same configuration as that of the first embodiment is omitted.

  5 and 6 are schematic views of the stirring device according to the second embodiment. As shown in FIGS. 5 and 6, the stirring device 14A includes a stirring unit 38A. The baffle plate portion 74 is provided in the stirring unit 38A. The baffle plate part 74 is attached to the Z1 direction side of the rotating shaft part 70 from the place where the stirring part 72 is attached. Further, the baffle plate portion 74 is located on the Z1 direction side of the stirring portion 72 and is located inside the stirring space A1 of the water tank 30. Further, the baffle plate portion 74 is located on the Z2 direction side with respect to the outflow port 52.

  The baffle plate portion 74 is a plate-like member extending from the rotary shaft portion 70 in the R1 direction. The baffle plate portion 74 overlaps at least a part of the stirring unit 72 when viewed from the Z direction, and preferably overlaps the entire region of the stirring unit 72 when viewed from the Z direction. Here, as illustrated in FIG. 6, a region where the stirring unit 72 is located as viewed from the Z direction is referred to as a region L. It can be said that the region L is a region inside the locus of the tip of the stirring unit 72 when the stirring unit 72 rotates. In this case, the baffle plate portion 74 preferably covers the entire region L. Here, the outer diameter of the baffle plate portion 74, that is, the length along the R1 direction is defined as a diameter D4. In this case, the diameter D4 of the baffle plate portion 74 is preferably longer than the diameter D3 of the stirring portion 72. Moreover, it is preferable that the length (thickness) along the Z direction of the baffle plate portion 74 is shorter than the length (thickness) along the Z direction of the stirring unit 72.

  Further, since the baffle plate portion 74 is attached to the rotating shaft portion 70, the baffle plate portion 74 rotates integrally with the rotating shaft portion 70 and the stirring portion 72 by the rotation of the rotating shaft portion 70. However, the baffle plate portion 74 may not be attached to the rotation shaft portion 70 and may not rotate integrally with the rotation shaft portion 70 and the stirring portion 72.

  Thus, the baffle plate portion 74 is provided above the stirring unit 72 in the vertical direction, and overlaps at least a partial region of the stirring unit 72 when viewed from the vertical direction. Here, a part of the raw water W1 that has flowed toward the stirring unit 72 due to the inflowing water flow F1 may pass between the plate-like members (wings) of the stirring unit 72 and flow into the Z1 direction side of the stirring unit 72. There is. Since this baffle plate portion 74 is superimposed on the stirring portion 72 on the Z1 side with respect to the stirring portion 72, the raw water W1 is further prevented from flowing in the Z1 direction side, and the raw water W1 is appropriately merged with the descending water flow F3. be able to. Therefore, the stirring device 14A can appropriately perform the stirring by the stirring unit 72 by providing the baffle plate portion 74.

(Third embodiment)
Next, a third embodiment will be described. The stirring device 14B according to the third embodiment is different from the first embodiment in the shape of the cylindrical portion 64B. In the third embodiment, description of portions having the same configuration as that of the first embodiment is omitted.

  FIG. 7 is a schematic diagram of a stirring device according to a third embodiment. As illustrated in FIG. 7, the stirring device 14B includes a communication unit 36B, and the communication unit 36B includes a cylindrical portion 64B. In the cylindrical portion 64B, an edge portion 64d on the inner peripheral side of one end portion 64a (opening portion 62) has an upward convex curved surface shape, that is, an R-chamfer. Therefore, the cylindrical portion 64B has an inner diameter that increases in the Z2 direction in the vicinity of the edge portion 64d. The edge portion 64d can be chamfered to reduce the head loss and reduce the influence on the water depth. However, the R chamfer is not necessarily required.

  Moreover, the cylinder part 64B is provided with a rectifying part 65 in an internal space 64c. The rectifying unit 65 is a plate-like member provided on the inner wall surface of the cylindrical part 64B in a spiral shape in the Z1 direction. The rectifying unit 65 gives a spiral flow to the raw water W1 that flows in the Z1 direction in the internal space 64c. Thereby, the rectification | straightening part 65 makes the inflow water flow F1B of the raw | natural water W1 which flows in into stirring space A1 from the internal space 64c into the water stream which goes to Z1 direction spirally toward the stirring part 72. FIG. The rectifying unit 65 preferably sets the spiral direction of the incoming water flow F1B to be the same as the spiral direction of the rising water flow F2. The shape of the rectifying unit 65 is arbitrary as long as the rectifying unit 65 has a structure that gives a spiral flow to the raw water W1 flowing in the space 64c of the cylindrical portion 64B.

  As described above, in the stirring device 14B according to the third embodiment, the edge portion 64d around the opening 62 has a shape in which the inner diameter becomes larger toward the Z2 direction. Therefore, according to this stirring device 14B, pressure loss when flowing from the inflow space A2 into the space 64c inside the cylindrical portion 64B can be suppressed, and stirring can be performed more suitably.

  Moreover, the stirring apparatus 14B provides the rectification | straightening part 65 in the space 64c inside the cylinder part 64B. The rectifying unit 65 gives a spiral flow to the raw water W1 flowing in the space 64c of the cylindrical part 64B. Therefore, according to the stirring device 14B, the inflow water flow F1B of the raw water W1 flowing into the stirring space A1 is formed into a spiral flow, thereby promoting stirring and consequently reducing the power of the stirring unit 72. .

(Fourth embodiment)
The stirring device 14C according to the fourth embodiment is different from the first embodiment in that the opening 62C is open to the partition wall 32C. In the fourth embodiment, description of portions having the same configuration as that of the first embodiment is omitted.

  FIG. 8 is a schematic view of a stirring device according to the fourth embodiment. In the first to third embodiments, the opening 62 opens to the plate portion 60 and is provided in the partition wall portion 32 via the plate portion 60. However, as shown in the fourth embodiment, the opening 62C may be directly opened in the partition wall 32C. That is, as shown in FIG. 8, the opening 62C is opened in the partition wall 32C according to the fourth embodiment. The opening 62C penetrates the partition 32C from the surface 32Ca on the Z1 direction side to the surface 32Cb on the Z2 direction side. Therefore, the opening 62C communicates the inflow space A2 and the stirring space A1. A cylindrical portion 64C is provided on the outer surface of the opening 62C on the surface 32Ca of the partition wall portion 32C. That is, the cylinder part 64C of the fourth embodiment is also provided on the surface 32Ca of the partition wall part 32C. Similarly, the stationary blade portion 66C according to the fourth embodiment is also provided on the surface 32Ca of the partition wall portion 32C and on the R1 direction side of the cylindrical portion 64C.

  As described above, in the fourth embodiment, the opening 62C, the cylindrical portion 64C, and the stationary blade portion 66C are directly provided in the partition wall portion 32C. Even with such a structure, the stirring device 14C can generate the inflow water flow F1, the rising water flow F2, and the descending water flow F3 as in the first embodiment, so that stirring can be appropriately performed. . Also in the fourth embodiment, the cylinder portion 64C is not necessarily provided.

(Fifth embodiment)
Next, a fifth embodiment will be described. The stirring device 14D according to the fifth embodiment is different from the first embodiment in that a plurality of openings 62D are opened in the partition wall 32D. In the fifth embodiment, description of portions having the same configuration as that of the first embodiment is omitted.

  9 and 10 are schematic views of a stirring device according to the fifth embodiment. In the first embodiment to the fourth embodiment, the opening 62 is provided on the R2 direction side (radial direction inner side) from the stationary blade portion 66. However, as shown in the fifth embodiment, a plurality of openings 62 </ b> D may be provided on the R1 direction side from the stationary blade portion 66. That is, as shown in FIG. 9, a plurality of openings 62D are opened in the partition wall 32D according to the fifth embodiment. The opening 62D penetrates from the surface 32Da on the Z1 direction side to the surface 32Db on the Z2 direction side of the partition wall portion 32D. A stationary blade portion 66D is provided on the surface 32Da of the partition wall portion 32D.

  Here, as shown in FIG. 10, the entire region of the partition wall portion 32D viewed from the Z direction is divided into a region B1 and a region B2. The region B1 is a region on the R2 direction side (radial direction inner side) of the region B2, and includes a region overlapping with the stirring unit 72 when viewed from the Z direction. In the example of FIG. 10, the region B1 includes the central axis AX and the stationary blade portion 66D. The region B2 is a region on the R2 direction side (radial direction inner side) of the region B1. In this case, it is preferable that the opening 62D is provided in the region B1 and not provided in the region B2.

  Here, the length from the central axis AX to the end of the region B1 on the R1 direction side is defined as a length D5. The length from the end of the region B1 on the R1 direction side to the end of the region B2 on the R1 direction side is defined as a length D6. In this case, the length D5 is preferably longer than the length D6. The length D5 is preferably 1 to 2 times the length D6.

  The opening 62D has a smaller diameter than the opening 62 of the first embodiment. The opening 62D is preferably 0.1% or more and 5% or less of the diameter of the water tank 30, for example.

  As described above, the stirring device 14D according to the fifth embodiment includes the water tank 30, the partition wall portion 32D, the inflow pipe 34, the stationary blade portion 66D, the plurality of openings 62D, and the stirring portion 72. The partition wall 32D is provided in the water tank 30, and divides the water tank 30 into a stirring space A1 and an inflow space A2. The inflow space A2 is provided in the Z2 direction with respect to the stirring space A1. Moreover, the inflow pipe 34 is connected to the water tank 30, and flows the raw water W1 into the inflow space A2. The stationary blade portion 66D is provided on the upper surface 32a of the partition wall portion 32 in the vertical direction, and a plurality of plate-like members extend in the radial direction. The opening 62D penetrates from the surface 32Da to the surface 32Db of the partition wall 32D and communicates the inflow space A2 and the stirring space A1. The stirring unit 72 is provided in the stirring space A1 and closer to the Z1 direction than the opening 62D, and stirs the raw water W1 in the stirring space A1.

  The plurality of openings 62D of the stirring device 14D are holes extending in the Z direction. Therefore, as shown in the inflowing water flow F1D in FIG. 9, the raw water W1 flowing into the stirring space A1 through the opening 62D flows in the Z1 direction. And since the stirring part 72 is located in Z1 direction rather than the opening part 62D, the raw | natural water W1 which flows in into stirring space A1 through the opening part 62D flows toward the stirring part 72. FIG. Therefore, similarly to the first embodiment, the stirring device 14D according to the fifth embodiment can appropriately perform stirring with low power and can suppress a short pass.

  Further, since the opening 62D is provided in the region B1 on the R2 direction side, the inflowing water flow F1D passing through the opening 62D can be appropriately maintained on the R2 direction side with respect to the descending water flow F3. Therefore, this stirring device 14D can suppress a short pass more suitably. As in the first embodiment, the cylindrical portion 64 may be provided on the outer periphery of each opening 62D.

  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 30 Water tank 32 Partition part 32a, 32b Surface 34 Inflow pipe 36 Communication unit 38 Stirrer unit 40 Flocculant addition part 42 Control part 60 Plate part 62 Opening part 64 Cylinder part 66 Stator blade part W1 Raw water

Claims (6)

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;
A hole penetrating from the vertical upper surface of the partition wall to the vertical lower surface;
An inflow pipe connected to the aquarium and allowing liquid to flow into the inflow space;
A plate portion disposed on the surface of the partition wall portion on the upper side in the vertical direction;
Provided in the plate portion, that communicates with the hole through the up vertically lower side of the surface from the vertical way improved side surface of the plate portion, an opening portion communicating with said agitation space and the inflow space When,
A cylindrical portion provided over the entire circumference of the opening, and extending vertically upward from the outer periphery of the opening;
A stationary blade portion, which is a surface on the upper side in the vertical direction of the plate portion and is provided on the radially outer side than the cylindrical portion, and a plurality of plate-like members extend in the radial direction;
A stirring unit 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 stirs the liquid in the stirring space;
Having
Stirring device. The stirring device according to claim 1 , further comprising a baffle plate portion that is provided above the stirring portion in a vertical direction and overlaps at least a part of the stirring portion when viewed from the vertical direction. The stirring section spirals from the stationary blade section toward the stirring section by stirring the liquid in the stirring space while receiving the water flow of the liquid flowing in from the inflow space through the opening. and increase the water flow rising to Jo, to generate a descending flow flowing from the periphery of the stirring portion to the stationary blade portions descends spirally toward the periphery of the stationary blade portions, to claim 1 or claim 2 The stirrer described. The stirrer according to any one of claims 1 to 3 , further comprising an outflow port that is provided above the stirrer in a vertical direction and that allows the liquid in the stirrer space to flow out to the outside. The stirrer according to any one of claims 1 to 4 , 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 1-5 .

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