JP2005021885A - Stirring apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stirring apparatus necessitating no power to reduce the running cost and capable of continuously stirring a liquid to be treated without stopping the treatment. <P>SOLUTION: In the stirring apparatus for stirring a fluid flowing in a prescribed direction in a pipe, a 1st baffle plate for producing liquid stream from the center of the pipe toward the inside wall surface and a 2nd baffle plate for producing liquid stream from the inside wall surface of the pipe toward the center on the downstream side of the 1st baffle plate are arranged at a certain interval between the inside wall surface of the pipe and the baffle plate. An opening part is provided in each center of both baffle plates and a 3rd baffle plate having a shelter part with which the liquid stream passing through the opening part of the 1st baffle plate collides can be arranged between the 1st and the 2nd baffle plates. The stirring apparatus can be constituted so that a plurality of obstructing means provided with a plurality of grid-like opening parts having a width narrowed toward the downstream side are arranged to make the direction of the grid of each obstructing means different. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a stirring device, and more particularly to a stirring device that stirs a liquid flowing in a predetermined direction in a pipe.

  Conventionally, in the treatment process of sludge water such as sludge, after removing coarse waste in the polluted water that is the treated water as a pretreatment, the flocculant is mixed with the polluted water to agglomerate the minute waste in the polluted water. The agglomerates are filtered with a filter cloth or filter paper, or precipitated with a settling tank, and separated from water to obtain purified water.

  In addition, the solid-liquid separation treatment of the water to be treated including sludge discharged when dredging the seabed and rivers leads to sludge into a large-capacity settling tank, and after adding organic flocculant to the precipitation treatment, A solid-liquid separation process is performed.

In the treatment process as described above, the flocculant (or the organic flocculant) to be added to the water to be treated has low dispersion efficiency in the water to be treated, and the water to be treated in which the flocculant is added to increase the dispersion efficiency. Is provided with a stirring device. For example, the polluted water into which the flocculant has been introduced is guided to a stirring tank, and stirring is performed by a stirring device provided in the stirring tank and having a rotating blade driven by a motor or the like (see, for example, Patent Document 1). .
JP 2000-317218 A

  However, the conventional stirring apparatus as described above requires an energy source such as electric power as a driving source for driving the rotor blades, and there is a problem that the running cost increases.

  Moreover, since the to-be-processed water into which the coagulant | flocculant was thrown into cannot be introduced into a stirring tank until stirring is completed, there exists a problem that a processing amount is restrict | limited.

  The present invention has been proposed based on the above-described conventional circumstances, and does not require power, can reduce running costs, and can continuously stir without stopping the supply of the liquid to be treated. An object is to provide a stirring device.

  The present invention employs the following means in order to achieve the above object. That is, the present invention relates to a first baffle plate that generates a liquid flow from the center of the tube toward the inner wall surface, and the first baffle plate in a stirring device that stirs a liquid to be processed that flows in a predetermined direction in the tube. The second baffle plate that generates a liquid flow from the inner wall surface of the tube toward the center downstream of the tube is disposed with a gap from the inner wall surface of the tube.

  In this way, when the liquid flowing in the pipe passes through the gap formed by the first baffle plate and the inner wall surface of the pipe, the liquid pressure rises and is ejected vigorously downstream from the gap. The That is, the liquid to be treated is agitated when passing through the gap between the first baffle plate and the inner wall surface of the tube.

  On the other hand, in the second baffle plate, the liquid flow that has passed through the first baffle plate collides with the second baffle plate as described above, and a part of the liquid to be processed has a gap with the inner wall surface of the pipe. Is injected in the downstream direction. That is, the liquid to be treated is agitated when passing through the second baffle plate.

  The baffle plates include a third baffle plate having an opening portion at the center thereof and a shielding portion where a liquid flow passing through the opening portion of the first baffle plate collides between the baffle plates. It is good also as a structure to arrange.

  Thereby, the fluid resistance of the stirring device can be reduced. In addition, since the liquid flow that has passed through the center of the first baffle plate collides with the third baffle plate, stirring is also performed during this collision.

  Further, a plurality of disturbing means provided in a lattice shape with a plurality of openings whose widths narrow toward the downstream may be arranged downstream of the second baffle plate with the lattice directions of the respective disturbing means being different directions. Good.

  According to the said structure, a liquid flow collides in the grid | lattice-like opening part of an obstruction means, and is stirred. Moreover, since the directions of the lattices of the respective disturbing means are different, the liquid flows collide with each other from different directions. For this reason, effective stirring can be performed.

  As described above, according to the present invention, the stirrer is configured by the baffle plate and the obstructing means, so that energy such as electricity is not necessary, and the running cost can be reduced.

  In addition, since the agitation process can be performed simply by connecting and inserting into the water pipe path of the liquid to be treated, the installation is easy and the agitation can be continuously performed without stopping the flow of the liquid to be treated. The amount of water purification treatment is not reduced.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Prior to this, a water purification system to which an embodiment of the present invention is applied will be described based on a cross-sectional view of FIG.

  A liquid 100 to be treated such as polluted water is pumped from a river or lake by a pump 31 via a net 32. The liquid 100 to be treated is transported through the water supply pipe 33, and the flocculant is added by the hopper 34 in the middle of the path, and then introduced into the settling tank 40. The number of the hoppers 34 may be installed according to the type of the flocculant to be added, and the stirrer 10 according to one embodiment of the present application is connected to the water supply pipe 33 on the settling tank 40 side of each hopper installation position. Concatenated and inserted. In the present embodiment, sodium carbonate and aluminum sulfate are sequentially added as a flocculant.

  The to-be-processed liquid 100 to which the flocculant is added is introduced into the precipitation tank 40, and flocs generated by the flocculant aggregate the solids in the to-be-processed liquid 100 and precipitate in the precipitation tank 40. . After such precipitation treatment, the supernatant liquid of the precipitation tank 40 is pumped out by a pump 41 through a net 42 for dust removal, and the purified liquid to be treated is discharged from the discharge port 43 to a river, a lake, or the like. Is done. In addition, the deposit 60 which settled in the sedimentation tank 40 is sent to a simple dehydrator (not shown), a solid-liquid separation process is performed, and solid content is removed.

  Moreover, the said water purification system is provided with the at least 2 sedimentation tank, and the inlet 35 which is the sedimentation tank 40 side end of a water pipe is arrange | positioned so that a movement is possible so that water can be poured into each sedimentation tank.

  For example, as shown in the top view of FIG. 7, when two precipitation tanks 40a and 40b are provided, the precipitation treatment using the above flocculant depends on the size of the precipitation tank, but for a short time (several hours). ), The sedimentation process of the other sedimentation tank 40b, the supernatant (purified water) discharge, and the precipitate within the time for performing the water injection operation of the liquid to be treated with the flocculant added in the one sedimentation tank 40a 60 solid-liquid separation processes can be performed. Therefore, it becomes possible to perform a purification process continuously by using two sedimentation tanks 40a and 40b alternately.

  As shown in the cross-sectional view of FIG. 1, the agitating device 10 has a first baffle plate 2, a third baffle plate 3, and a second baffle in a casing 1 made of a vinyl chloride tube or the like from the upstream side of the flow. The first baffle 5 and the second baffle 6 are arranged on the downstream side of the second baffle 4. Moreover, the flange 9 for connecting with the said water supply pipe | tube 33 directly or via an adapter is provided in the both ends of the stirring apparatus 10. FIG.

  As shown in the perspective view of FIG. 2, the first baffle plate 2 is made of a metal plate such as a steel plate, and its outer shape is a shape obtained by cutting the tip of a regular quadrangular pyramid with a plane parallel to the bottom surface, that is, a housing. While having four surfaces which incline toward the inner wall surface from the center part of the body 1, it has the shape which has the square opening part 21 in the center. The four vertices constituting the bottom surface are welded to the outer periphery of the opening surface of the steel pipe 22 having an outer diameter equal to the diagonal length of the bottom surface. The outer diameter of the steel pipe 22 is equal to the inner diameter of the casing 1 and is inserted into the casing 1 with the protruding side as the upstream direction, and the steel pipe 22 is screwed from the outside of the casing 1 and fixed in place. It can be done.

  The third baffle plate 3 is a disc having an outer diameter corresponding to the opening 21 provided in the center of the first baffle plate 2. In this embodiment, as shown in the front view of FIG. 3, the support member 7 having an L-shaped cross section is attached to the steel tube 22 that supports the first baffle plate 2. The disk is supported by the support member 7. In addition, as shown with a broken line in FIG. 3, this disk may be provided with an opening 30 at the center thereof in order to reduce fluid resistance.

  Further, the second baffle plate 4 has the same structure as that of the first baffle plate 2, but in the opposite direction into the housing 1, that is, with the protruding side being the downstream direction, the first baffle plate 2. It is fixed by rotating 45 degrees with respect to.

  In the above-described configuration, the liquid 100 to be treated introduced into the stirring means 10 is a liquid flow passing through the opening 21 of the first baffle plate 2, and the inner wall surface of the housing 1 along the first baffle plate 2. The liquid flow toward the gap 23 is divided. The liquid 100 to be processed toward the gap 23 has its passage gradually narrowed by the time it reaches the gap 23, so that the flow velocity increases and is jetted downstream from the gap 23. Thereby, the to-be-processed liquid 100 is stirred.

  On the other hand, the liquid 100 to be processed that has passed through the opening 21 collides with the third baffle plate 3. And the liquid flow which collided with this 3rd baffle plate 3 detours the 3rd baffle plate 3, and goes to the downstream, but stirring is naturally performed also in this collision .

  Subsequently, when the liquid 100 to be processed reaches the second baffle plate 4, the liquid 100 passes through the opening 41 and the gap 43 and goes downstream as in the case of the first baffle plate 2. Here, since the installation direction is opposite to the first baffle plate, the flow rate of the liquid 100 to be processed that passes through the opening 41 increases, and is jetted in the downstream direction and stirred.

  By the way, the agitation device 10 is provided with obstruction means 5 and 6 provided with openings 51 in a lattice shape on the downstream side of the second baffle plate 4, the widths of which narrow toward the downstream. FIG. 4 shows a front view of the disturbing means 5 and 6. FIG. 5 is a cross-sectional view taken along the line A-A ′ in FIG. 4.

  The obstruction means 5 and 6 have a configuration in which a shielding portion 52 made of a bar or the like having a V-shaped cross section is welded to the opening surface of the steel pipe 53 whose outer diameter is equal to the inner diameter of the housing 1 in a vertical lattice shape at a predetermined interval. That is, it has a structure having a plurality of vertical openings, and is disposed in the housing 1 with the open end of the V-shape being the downstream direction. Further, the disturbing means 6 is arranged to be rotated by 90 degrees (the direction of the lattice is orthogonal) with respect to the disturbing means 5.

  In this configuration, the water to be treated 100 that has passed through the second baffle plate 4 collides with the shielding plate 52 when passing through the blocking means 5, and the liquid flow along the adjacent shielding plate 52 in the opening 51. Since the two collide with each other, the liquid 100 to be treated is stirred. Similarly, the liquid 100 to be treated is also agitated in the obstruction means 6, but the direction of the lattice is rotated by 90 degrees. Therefore, in the opening 51, a liquid flow collision in a direction different from that of the obstruction means 5 occurs. The treatment liquid 100 can be effectively stirred.

  As described above, since the stirring device of the present invention does not have a drive unit such as a rotary blade, the liquid to be processed can be efficiently stirred without power. Therefore, for example, in the water purification treatment of polluted water, the running cost can be reduced, and it can be easily installed even when working outdoors such as near rivers and lakes.

  Furthermore, the stirring device of the present invention can perform stirring only by being connected and inserted into the path of the water supply pipe for the liquid to be treated, and it is not necessary to provide a stirring tank for performing the stirring process. In addition, since the liquid to be treated is stirred only by passing through the stirring device of the present invention, the liquid to be treated can be continuously stirred without stopping the flow of the liquid to be treated, thereby reducing the amount of purification processing. I will not let you.

(Example)
Below, the example of the water purification process using the water purification system shown in FIG. 6 is shown, the SS and COD values of the liquid to be treated before and after the treatment, and the nitrogen, phosphorus and iron contained in the liquid to be treated. Indicates weight. The stirrer 10 of the present invention is installed on the downstream side of each of the coagulant adding portions 34a and 34b as described above. In FIG. 6, two flocculant addition portions 34a and 34b are shown. In the following embodiments, the same number of flocculant addition portions as the number of types of flocculants are installed, and each flocculant addition portion is added. Each flocculant was added from the part.

  Pumped liquid to be treated with SS of 16000mg / l (steam sludge from Koyama pond in Tottori City) with 1g of soda ash as a flocculant and 35% sulfuric acid band aqueous solution for 1L of water to be treated. Sequentially added at a rate of 10 g.

Before treatment After treatment SS (mg / l) 16000 1
COD (mg / l) 1500 7.2
Total nitrogen (mg / l) 440 5.7
Total phosphorus (mg / l) 31 0.06
Iron (mg / l) 2400 0.08

  Water to be treated with SS of 60000 mg / l (the bottom of sludge of Koyama pond in Tottori City) is pumped up, and the following two types of flocculants (1) and (2) per liter of water to be treated Were sequentially added to precipitate aggregates, and the aggregates were removed from the liquid to be treated by filtration and precipitation. The liquid to be treated was pumped up again, and the following three kinds of flocculants (3), (4), and (5) were sequentially added to 1 L of the liquid to be treated.

Flocculant (1) MMC (mixture containing 15 g of water glass per 1 L of seawater, or mixture containing 10 g of calcium chloride and 15 g of water glass per 1 L of water) 30 g
(2) BK (1% concentration polymer aqueous solution) 30 g
(3) CSD (mixture of cement, slaked lime, soda ash) 0.4 g
(4) PKC (polyaluminum chloride) 0.52 g
(5) BK 1.0g
Before treatment After treatment SS (mg / l) 60000 15
COD (mg / l) 3200 11
Total nitrogen (mg / l) 1000 4.3
Total phosphorus (mg / l) 70 0.10
Iron (mg / l) 3800 0.08

  Water to be treated with SS of 42000mg / l (Lake bottom sludge water in Kasumigaura) is pumped up, and the following three types of flocculants (1), (2) and (3) are added per liter of water to be treated. Sequentially added to precipitate aggregates, and the aggregates were removed from the liquid to be treated by filtration and precipitation. Thereafter, the liquid to be treated was pumped up again, and the following flocculants (4), (5) and (6) were sequentially added to 1 L of the liquid to be treated.

Flocculant (1) GA (4% sodium dichlorate aqueous solution) 15g
(2) MMC 40g
(3) BK 10g
(4) CSD 1.5g
(5) PKC 3.0g
(6) BK 4.0g
Before treatment After treatment SS (mg / l) 42000 1
COD (mg / l) 6400 14
Total nitrogen (mg / l) 3400 9.8
Total phosphorus (mg / l) 220 Less than 0.05 Iron (mg / l) 11000 0.01

  To-be-treated water with an SS of 900 mg / l (Honmachibashi upstream water (Kayabo River)) is pumped up, and the following three types of aggregation (1), (2), and (3) per liter of treated water Agents were added sequentially.

Flocculant (1) CS (mixture of cement and slaked lime) 0.3g
(2) KC (30% concentration sulfuric acid band aqueous solution) 0.4 g
(3) BK 1.0g
Before treatment After treatment SS (mg / l) 900 3
COD (mg / l) 100 4.7
Total nitrogen (mg / l) 11 1.9
Total phosphorus (mg / l) 1.0 Less than 0.05 Iron (mg / l) 34 0.09

  Water to be treated (raw water from Maruyama River dredgers) with a COD of 270 mg / l is pumped up, and the following three types (1), (2) and (3) The flocculant was added sequentially.

Flocculant (1) MB (water glass) 0.3g
(2) MA (35% strength calcium chloride aqueous solution) 0.4 g
(3) BK 0.8g
Before treatment After treatment COD (mg / l) 270 8.9
Total nitrogen (mg / l) 73 2.1
Total phosphorus (mg / l) 9.3 0.05
Iron (mg / l) 260 0.05

  Water to be treated with SS of 86,000 mg / l (pumped to the bottom of the pond at Sasayama Castle in Sasayama City) is pumped, and the following (1), (2), (3) Three types of flocculants were added sequentially.

Flocculant (1) CSD 0.5g
(2) KC 0.6g
(3) BK 1.0g
Before treatment After treatment SS (mg / l) 86000 18
COD (mg / l) 9400 18
Total nitrogen (mg / l) 800 4.7
Total phosphorus (mg / l) 160 Less than 0.05 Iron (mg / l) 3200 0.09

  The treated water (Yonedagawa Yonedagawa river bottom sludge water) with SS of 5700mg / l is pumped up and the following (1), (2), (3) Three types of flocculants were added sequentially.

Flocculant (1) CSD-K (mixture of cement, slaked lime, soda ash, polymer) 0.2 g
(2) KC 0.26g
(3) BK 1.6g
Before treatment After treatment SS (mg / l) 5700 110
COD (mg / l) 700 21
Total nitrogen (mg / l) 110 2.2
Total phosphorus (mg / l) 7.3 Less than 0.05 Iron (mg / l) 98 0.08

  Water to be treated with SS of 1500 mg / l is pumped up, and the following 4 types of flocculants (1), (2), (3), and (4) are added sequentially per liter of water to be treated. Then, the aggregate was precipitated, and the aggregate was removed from the liquid to be treated by filtration or precipitation. Thereafter, the liquid to be treated is pumped up again, and the following five types of flocculants (5), (6), (7), (8), and (9) are sequentially added per 1 liter of the liquid to be treated. did.

  The water to be treated of Example 8 is red blood drainage generated from the dismantling work of beef meat discharged from Mita Meat Public Corporation in Mita City, Hyogo Prefecture.

Flocculant (1) MCA (calcium sulfate) 3.0g
(2) GA 30g
(3) MMC 30g
(4) BK 15g
(5) GA 15g
(6) POK (mixture of cement, slaked lime, soda ash, polymer) 0.5 g
(7) CSD 0.6g
(8) KC 0.8g
(9) BK 3.0g
Before treatment After treatment SS (mg / l) 1500 20
COD (mg / l) 1200 72
BOD (mg / l) 3900 350
Total nitrogen (mg / l) 740 8.6
Total phosphorus (mg / l)-0.14

  To-be-treated water with a COD of 95 mg / l (Shiga Prefectural Sewerage Corporation, Kosai Treatment Office, sewer water inlet diversion tank raw water) is pumped up, and the following (1), (2), The four types of flocculants (3) and (4) were sequentially added.

Flocculant (1) SD (12% aqueous soda ash solution) 3.0 g
(2) KC 1.5g
(3) MCA 0.5g
(4) BK 3.0g
Before treatment After treatment COD (mg / l) 95 17
Total nitrogen (mg / l) 36 20
Total phosphorus (mg / l) 6.5 Less than 0.05

  The same water to be treated as in Example 9 was pumped up, and the following four types of flocculants (1), (2), (3), and (4) were sequentially added per 1 liter of water to be treated.

Flocculant (1) MA 1.5g
(2) GA 3.0g
(3) MCA 0.5g
(4) BK 3.0g
Before treatment After treatment COD (mg / l) 95 24
Total nitrogen (mg / l) 36 14
Total phosphorus (mg / l) 6.5 1.5

  To-be-treated water with SS of 290 mg / l (Shiga Prefectural Sewerage Corporation, Kosai Treatment Office, inlet water separation tank water) is pumped up, and the following (1), (2), (3) , (4), (5) and (6) were sequentially added.

Flocculant (1) 6.0g MMC
(2) MA 1.0g
(3) GA 2.0g
(4) SD 2.0g
(5) KC 1.0g
(6) BK 5.0g
Before treatment After treatment SS (mg / l) 290 Less than 1 COD (mg / l) 100 32
Total nitrogen (mg / l) 46 15
Total phosphorus mg / l) 6.6 0.05

  Water to be treated with COD of 4300 mg / l (untreated raw sludge in Tottori City Akisato sewerage water treatment plant) is pumped up, and the following two types (1) and (2) below per liter of water to be treated Of flocculants were added sequentially.

Flocculant (1) MMC 40g
(2) BK 40g
Before treatment After treatment COD (mg / l) 4300 55
Total nitrogen (mg / l) 1300 38
Total phosphorus (mg / l) 280 45

  The treated water to which the flocculant was added in Example 12 was pumped up again, and the following (1), (2), (3), (4), (5) 5 types of flocculants were added sequentially.

Flocculant (1) 4.0 g SD
(2) KC 2.0g
(3) MA 4.0g
(4) GA 8.0g
(5) BK 10g
Before treatment After treatment COD (mg / l) 55 36
Total nitrogen (mg / l) 38 6.7
Total phosphorus (mg / l) 45 0.23

  To-be-treated water with a COD of 56 mg / l (Tottori City Akisato Sewerage Water Treatment Plant Inlet raw sewage) is pumped, and the following (1), (2), (3) The four types of flocculants (4) and (4) were sequentially added.

Flocculant (1) MMC 10g
(2) MA 4.0g
(3) GA 8.0g
(4) BK 10g
Before treatment After treatment COD (mg / l) 56 −
Total nitrogen (mg / l) 36 4.6
Total phosphorus (mg / l) 46 0.26

  To-be-treated water with COD of 72 mg / l (Tottori City Akisato Sewerage Treatment Plant Inlet raw raw sewage) is pumped, and the following (1), (2), (3 ) Three types of flocculants were added sequentially.

Flocculant (1) MA 3.0g
(2) GA 6.0g
(3) BK 8.0g
Before treatment After treatment COD (mg / l) 72 21
Total nitrogen (mg / l) 39 8.3
Total phosphorus (mg / l) 44 5.1

  Water to be treated (Wakayama City Hall Aogishi Manure Treatment Factory raw water) with a COD of 2700 mg / l is pumped up and the following (1), (2), (3), (4) per 1 liter of water to be treated ) And 5 types of coagulants (5) were sequentially added.

Flocculant (1) MMC 20g
(2) MA 5.0g
(3) SD 10g
(4) GA 30g
(5) BK 10g
Before treatment After treatment COD (mg / l) 2700 21
Total nitrogen (mg / l) 580 13
Total phosphorus (mg / l) 280 0.96

  Water to be treated with SS of 150 mg / l (outside water in the south of Shandong village drainage sewage pump) is pumped up, and the following two types of flocculants (1) and (2) are added per liter of water to be treated. Sequentially added, the aggregates were precipitated, and the aggregates were removed from the liquid to be treated by filtration and precipitation. Thereafter, the liquid to be treated was pumped up again, and the following three types of flocculants (3), (4) and (5) were sequentially added per liter of the liquid to be treated.

Flocculant (1) MMC 45g
(2) BK 60g
(3) SD 1.0g
(4) PKC 1.2g
(5) BK 2.0g
Before treatment After treatment SS (mg / l) 150 2
COD (mg / l) 110 17
Total nitrogen (mg / l) 43 17
Total phosphorus (mg / l) 5.3 −

  Water to be treated (Fuji City, Koa Kogyo Paper Waste Sludge Water) with a COD of 7200 mg / l is pumped up and the following two types of flocculants (1) and (2) are used per liter of water to be treated. Were sequentially added to precipitate aggregates, and the aggregates were removed from the liquid to be treated by filtration and precipitation.

Flocculant (1) MMC 30g
(2) BK 30g
Before treatment After treatment COD (mg / l) 7200 95
Total nitrogen (mg / l) 690 5.6

  The liquid to be treated from which the aggregates were removed in Example 18 was pumped up, and the following three kinds of flocculants (1), (2), and (3) were sequentially added to 1 L of the water to be treated. Then, the aggregate was deposited in the liquid to be treated, and the aggregate was removed by filtration or precipitation.

Flocculant (1) CSM 0.5g
(2) PKC 0.65g
(3) BK 0.65g
Before treatment After treatment COD (mg / l) 95 82
Total nitrogen (mg / l) 5.6 3.5
As described above, in the water purification system to which the present invention is applied, in the continuous treatment in which the water to be treated is pumped and the flocculant is sequentially added, as shown in the examples, it is superior to various kinds of water to be treated. It can be understood that there is a purification effect.

1 is a cross-sectional view of an embodiment of the present invention. The perspective view of the baffle plate of this invention. The front view of the baffle plate of this invention. The front view of the obstruction means of this invention. Sectional drawing of the obstruction means of this invention. Sectional drawing which shows the water quality purification system to which the stirring apparatus of this invention is applied. The top view which shows the water purification system to which the stirring apparatus of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2, 3, 4 Baffle plate 5, 6 Interference means 10 Stirrer 40, 40a, 40b Sedimentation tank

Claims (3)

In a stirring device that stirs a liquid flowing in a predetermined direction in a pipe,
A first baffle plate that is disposed with a gap with respect to the inner wall surface of the tube and generates a liquid flow from the center of the tube toward the inner wall surface;
A second baffle plate that is arranged on the downstream side of the first baffle plate with a gap with respect to the inner wall surface of the tube and generates a liquid flow from the inner wall surface of the tube toward the center;
A stirrer comprising: The both baffle plates have an opening at the center thereof, and a third baffle plate having a shielding portion where a liquid flow passing through the opening of the first baffle plate collides between the baffle plates. Item 2. The stirring device according to Item 1. A plurality of obstruction means provided in a lattice shape with a plurality of openings whose widths narrow toward the downstream are provided downstream of the second baffle plate, and the obstruction means are arranged in different directions of the lattice. Item 3. The stirring device according to Item 2.

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