KR101896891B1 - Buoyant filter medium-stirring device and filter - Google Patents

Buoyant filter medium-stirring device and filter Download PDF

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Publication number
KR101896891B1
KR101896891B1 KR1020137022262A KR20137022262A KR101896891B1 KR 101896891 B1 KR101896891 B1 KR 101896891B1 KR 1020137022262 A KR1020137022262 A KR 1020137022262A KR 20137022262 A KR20137022262 A KR 20137022262A KR 101896891 B1 KR101896891 B1 KR 101896891B1
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stirring
filter
drive shaft
filter medium
filtration
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KR1020137022262A
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Korean (ko)
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KR20140017558A (en
Inventor
다카노리 데하라
마나부 야마시타
노부오 혼다
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가부시키가이샤 이시가키
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4668—Regenerating the filtering material in the filter by moving the filtering element
    • B01D24/4673—Regenerating the filtering material in the filter by moving the filtering element using rotary devices or vibration mechanisms, e.g. stirrers

Abstract

The present invention is characterized in that a stock solution is supplied to a filtration tank (1) provided with a hermetically sealed filter chamber (2) for housing a floating filter medium (3) To a stirring device (10) for stirring a floating filter medium (3) in a filter
The stirring apparatus 10 is provided with a driving shaft 8 provided upright on the bottom portion 1a of the filter chamber 2 and a plurality of outlet holes 9b provided on the driving shaft 8 and extending obliquely upward Shaped stirring vanes 9 are provided with stirring vanes 9 arranged in the vicinity of the bottom surface 5a of the filtration layer of the filter medium layer 5. [

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a filtering device,

TECHNICAL FIELD The present invention relates to a stirring device for stirring a floating filter medium in a filter for filtering a stock solution by using an floating filter medium (floating filter material) and a filter using the floating filter medium.

Liquid separation (solid-liquid separation) is performed by upward flow using a downward flow type sand filter device or a lightweight resinous filter material or fiber filter material Upflow filtration devices are known. In the upflow type filtration apparatus using a floating filter medium such as a resin filter material or a fiber filter material, the undiluted liquid in the bottom of the filtration tank is fed through the filter material layer, the filtrate material layer is subjected to solid-liquid separation of contaminants in the crude liquid, Remove the filtrate from the top. The clogged filter medium layer is washed and agitated by a stirring device to regenerate the filter medium. The floating filter material such as the resin filter material or the fiber filter material has a light specific gravity and can easily stir the clogged filter material layer and has an advantage of using less washing water.

For example, Patent Document 1 discloses an upflow filtration method in which an agitation blade, which is the same as the diameter of the outlet of the filtration water (filtration water) is extended to the vicinity of the floating filter medium layer in order to mount the agitation device and exert the agitating force of the filter medium Device.

In Patent Document 2, a conical-shaped water collecting nozzle is hanged down on a ceiling wall of a filtration tank (filtration tank), an agitating device is installed on the bottom of the filtration tank, And a dead space of a stirring flow (stirring flow) is minimized to obtain a smooth stirring efficiency.

Japanese Utility Model Publication No. 2-2404 (utility model registration claim, Fig. 1) Japanese Patent Application Laid-Open No. 10-277315 (Claim 1, Fig. 3)

A conventional filtration apparatus using floating filter medium has a structure in which a filter medium layer is formed by a floating filter medium in a filter chamber and the undiluted fluid is passed through the filtration layer by an upward flow. In the filtration apparatus using the floating filter material, the area of the lower surface of the filter material layer is the filtration area of the filtration tank, which allows high-speed filtration and is easy to clean because the filtration material is light.

However, in the shape of the stirring vanes protruding radially from the rotation axis and perpendicular to the rotation direction as in Patent Documents 1 and 2, when the filter material layer is cleaned by the rotation of the stirring vane, the swirling flow in the horizontal direction ). Therefore, the filtration material flows in the middle part of the filtration chamber, but the stirring effect is weak because the flow of the filtration material is small at the upper part of the filtration chamber. The shape of the stirring vane has a large water flow resistance at the time of rotation and requires large power. In order to maintain the number of revolutions of the stirring device without reducing the fluidity of the filter medium, the current value can not be lowered and the power can not be reduced. Since the floating filter medium in the lower part mostly comes in contact with the stirring blade and the stirring blade is perpendicular to the rotating direction because there is no flow of the water flowing upward and downward in the filter chamber, the floating filter medium is damaged by the contact with the stirring blade, The lifetime of the battery is shortened.

The present invention relates to a floating filter material in a filter for filtering a raw liquid using an floating filter material capable of improving cleaning and stirring efficiency of the floating filter material, reducing stirring power by reducing the number of revolutions of the stirring blades, and extending the life of the floating filter medium And a filter using the same.

A first aspect of the present invention is a method for supplying a stock solution to a filtration tank (filtration tank) having a hermetically sealed filtration chamber for storing a floating filter medium (floatation filtration material) A filter for performing solid-liquid separation (solid-liquid separation) of the stock solution by a layer (filtration material layer), comprising: a stirring device for stirring the floating filter material; And a plurality of plate-like stirring blades attached to the drive shaft and having an outflow end that extends obliquely upwardly, wherein the filter is provided with a plurality of plate- And a stirring device having an agitating blade disposed therein.

A second aspect of the present invention is a filtration apparatus comprising: a filtration tank having a filtration chamber of a closed shape for receiving a filtrate; and a filter member accommodated in a discharge side of the treated water of the filtration chamber to form a filter medium layer for solid- A plurality of plate-like agitating members provided on the drive shaft and having an outflow end extending obliquely upward on the discharge side of the treatment water; And the wing is a filter having a stirring blade disposed in the vicinity of the lower surface of the filter layer of the filter material layer.

According to the first and second aspects of the present invention, since the blade tips (outflow ends) of the stirring blades of the stirring device provided in the filter chamber are extended obliquely upward, The rising horizontal flow and the vertical rising line can be generated at the same time, so that the effect of washing and stirring of the floating filter medium is enhanced. Horizontal line horizontal flow caused by rotation of the stirring blades causes a horizontal swirling flow in the vicinity of the stirring blades. The ascending flow of the vertical line sweeps the filter medium at the bottom of the filtration tank upwards to generate a swirling flow in the vertical direction terminating in the tank. The floating filter material forming the filter material layer is circulated to flow through the horizontal flow and the ascending flow so that the clogged material trapped on the lower surface of the filter material layer is peeled off and turbulent flow is applied to the floating filter material to cause the floating filter materials to collide with each other, The captured contaminants can be finely separated to regenerate the filter material layer. Further, since the resistance due to the rotation of the stirring blades is small, the current value can be lowered, power consumption can be reduced, and power consumption can be saved.

The stirring vane may have an inclination angle of 30 ° to 40 ° with respect to a plane perpendicular to the rotation axis of the drive shaft and widening in the radial direction of the rotation axis.

According to the above configuration, the wing surfaces of the stirring vanes pivoting about the drive shaft slide on the wastewater, and a horizontal flow of the vertical lines and a horizontal line of the horizontal lines are generated by the rotation of the stirring vanes, .

Further, the stirring vane may be provided with an R-shaped corners at the inflow end and at the outflow end.

According to the above configuration, since the front end edge of the blade of the stirring blade that slopes up and down obliquely is formed in the shape of R, even if the floating floating filter material that flows in contact with the tip of the blade of the stirring vane does not damage the filter material, the life of the filter material becomes long .

The diameter formed by the plurality of stirring blades may be 30 to 60% of the inner diameter of the filter chamber.

According to the above configuration, the water in the entire interior of the filter chamber can be flowed to loosen the filter material layer.

Further, the uppermost portion of the stirring vane may be located at a height of 40 to 65% of the filter chamber.

According to the above-described configuration, an upward flow of the vertical line is generated in the upper portion of the stirring vane by the rotation of the stirring vane, and an upward flow of the circulating flow is generated in the lower portion of the stirring vane. The upward flow of the vertical line generated by the rotation of the stirring blade winds up the filter material at the bottom of the filter chamber and circulates the floating filter material through the filter chamber so as to peel off the clogged material. Clogging of the screen on the drainage side can be prevented.

The number of the agitating blades may be three.

According to the above configuration, the stirring device fixed to the drive shaft can maintain the balance of the stirring device.

1 is a longitudinal sectional view of a filter using a floating filter medium according to an embodiment of the present invention.
2 is a side view of the stirring device for the floating filter medium according to the embodiment of the present invention.
3 is a plan view of the stirring apparatus of Fig.
4 is a conceptual diagram of one stirring blade fixed to the drive shaft.
Fig. 5 is a longitudinal sectional view of a filtration tank provided with an agitation apparatus according to an embodiment of the present invention. Fig.
6 is a conceptual diagram showing a flow state of a cleaning filter medium in a filtration tank in a filter according to an embodiment of the present invention.
7 is a conceptual diagram showing the flow state of the cleaning filter medium in the filtration tank in the conventional filter.
8 is a side view for comparing the blade position of the stirring blade in the conventional stirring device and the blade position of the stirring blade according to the embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a longitudinal sectional view of a filter (filter) 20 using a floating filter material (floating filter material) according to an embodiment of the present invention. The filtration tank 1 of the filter 20 is in a hermetically sealed state and a fiber filter medium or a foamed particulate filter medium And a floating filter medium 3 such as a filter medium. (Raw material liquid) is supplied from the supply pipe 4 connected to the bottom bottom 1a of the filtration tank 1 to form a filter material layer (filter material layer) 5 in the filter chamber 2. A cylindrical water collecting nozzle 6 provided on the upper portion of the filter chamber 2 is connected to a collecting pipe 7 connected to the top portion 1b of the filtration tank 1, The treatment water separated from the contamination by the layer 5 is taken out from the collecting pipe 7.

A drive shaft 8 is installed in the filter chamber 2 so as to pass through the center of the bottom (bottom) 1a of the filtration tank 1. A stirring blade 9 is attached to the upper end of the drive shaft 8 to constitute a stirring device 10. When the floating filter medium forming the filter material layer 5 catches the clogging and is clogged, the stirring device 10 is operated by the driving machine 11 provided at the lower end of the driving shaft 8 to rotate the floating filter medium 3 And agitated.

2 and 3 are a side view and a plan view of the stirring apparatus 10 according to the embodiment of the present invention. Like stirring blade having an R-shaped edge portion 9c of an inlet end (inlet end) 9a and an outlet end (outlet end) 9b is provided on a drive shaft 8 provided upright on the bottom bottom 1a of the tank. And the outlet end 9b of the stirring vane 9 is extended obliquely upward into the filter chamber 2 (obliquely above the paper surface of Fig. 1) ). The stirring blade 9 attached to the drive shaft 8 has an inclination angle? Of 30 to 40 degrees. The stirring device 10 is provided in the vicinity of the filtration layer bottom surface 5a of the filter material layer 5. [ The inclination angle? Is an angle formed by the stirring vane 9 and a plane perpendicular to the rotation axis of the drive shaft 8 and widening in the radial direction of the rotation axis. In the present embodiment, it is an angle formed by the stirring vane 9 and the bottom bottom 1a.

The stirring vane 9 turning around the drive shaft 8 is rotated by the differential pressure generated by rotating the inclined stirring vane 9 in the rotating direction K simultaneously with the horizontal flow of the horizontal line Thereby generating a swirling flow in the vertical direction. More specifically, the floating filter medium 3 under the filtration tank 1 is sucked by the inlet end 9a of the stirring vane 9 and is discharged from the outlet end 9b of the stirring vane 9 to the upper side of the filtration tank 1 Discharge with speed. At this time, in the vicinity of the filtration tank 1, the floating filter medium 3 descends from the upper side downward, and the floating filter medium 3 circulates in the vertical direction in the filtration tank 1. A severe turbulence is generated by the vortical flow in the transverse direction and the longitudinal direction occurring in the filtration tank 1 and the floating filter medium 3 is repeatedly rotated and collided to increase the cleaning stirring action. The stirring wing 9 flows the sewage so that the clogged material trapped on the lower surface of the filter material layer 5 is peeled off and the filter material layer 5 is regenerated by crushing the impurities trapped between the floating filter materials 3 . The R-shaped edge portion 9c of the inflow end 9a and the outflow end 9b does not damage the floating filter medium 3 even if the floating filter medium 3 that flows is sliding on the wing surface of the stirring vane 9 The life of the filter medium is prolonged.

As shown in Fig. 3, in the embodiment of the present invention, the number of stirring blades 9 attached to the drive shaft 8 is three, and the balance of the stirring device 10 is divided into three stirring blades 9 . In the example shown in Fig. 3, the blade diameter d of the stirring apparatus 10 is? 400.

Fig. 4 is a conceptual diagram of one stirring blade 9 attached to the drive shaft 8. Fig. In the embodiment of the present invention, the inclination angle? Of the stirring blade 9 attached to the drive shaft 8 that generates a rising flow at the vertical line is set to? = 37.7 degrees.

5 is a longitudinal sectional view of a filtration tank 1 according to an embodiment of the present invention. The stirring apparatus 10 is installed at a position of 40 to 65% of the height H (e.g., 1900 mm) of the filter chamber 2. The agitating device 10 is configured such that an ascending flow of the vertical line due to the rotation of the stirring vane 9 causes an ascending circulation flow at the vertical line on the upper portion of the filter chamber 2 and an ascending flow at the lower portion of the filter chamber 2 So that the floating filter medium 3 on the bottom bottom 1a is lifted up to generate a swirling flow in the longitudinal direction terminating the filter chamber 2. [ At the same time, a horizontal flow of horizontal lines in the horizontal direction is generated in the vicinity of the stirring vanes 9.

In the embodiment of the present invention, the blade tip (top) of the stirring vane 9 is provided below h = 126 mm from the bottom surface 5a of the filter layer 5 of the filter material layer 5.

6, wastewater in the entire interior of the filter chamber 2 is caused to flow by the rising flow and the horizontal flow caused by the rotation of the stirring vane 9 to loosen the filter medium layer 5, To thereby regenerate the filter medium layer 5.

The filtration tank 1 shown in Fig. 5 is a filtration tank in which when the filter medium layer 5 of the floating filter medium 3 is clogged, the washing water is supplied from the collecting nozzle 6 above the filtration tank 1, The flocculant trapped on the lower surface 5a of the filtration layer is peeled off by rotating the float filter material 9 by rotating the float filter material 3 forming the filter material layer 5 and crushing the impurities trapped between the floating filter material 3 Thereby regenerating the filter material layer 5, and discharging the washing water from the feed pipe 4 of the raw water. A screen (not shown) for preventing the outflow of the floating filter medium 3 and the inflow of debris into the filter chamber 2 is provided elongated in the opening of the supply pipe 4, 4) to prevent clogging of the screen.

Next, the stirring apparatus 10 according to the embodiment of the present invention will be described in comparison with a suitable conventional stirring apparatus 110. FIG.

Conventionally, the stirring device 110 of the filter medium using the floating filter medium of Patent Document 1 has the blade diameter equal to the diameter of the outlet of the filtration water, and the stirring device 110 is extended to the vicinity of the filter medium layer. A conventional test machine for performing a comparative test has the following specifications.

Body Height (mm): 1900

Main body diameter (mm): φ850

Filtration area (m 2 ): 0.56

Stirring power (kW): 3.7

Operating current value (A): 15

Rated current value (A): 16 (200V)

The cleaning water is supplied from the bottom side of the filtration tank to the position of the stirring device 110, the shape of the blade, the diameter and the number of revolutions of the blade by using the conventional stirring device 110 of the filter medium, The stirring apparatus 110 was tested while discharging the washing water.

The stirring of the filter material layer was confirmed by setting the number of revolutions to 504 rpm in the stirring device 110 of the tester specifications.

As shown in Fig. 7, the floating filter medium for forming the filter medium layer in the filter chamber was observed, but the movement of the filter medium above the filter chamber was only a swirling flow in the horizontal direction. In order to flow the filter medium from the conventional stirring device 110 to the upper portion of the filtration tank, it is necessary to increase the stirring power to increase the number of revolutions.

Also, when the number of rotations is reduced from 504 rpm to 390 rpm, the current value drops from 15.0 A to 12.2 A, but the flow of the floating filter medium at the upper portion of the filter is extremely deteriorated and the cleaning efficiency is lowered.

The wing shape was examined to turn the movement of the filter medium in the upper part of the filter chamber not only in the transverse direction but also in the longitudinal direction as shown in Fig.

As shown in Figs. 2 and 3, three plate-like stirring blades 9 extending obliquely upward from the outlet end 9b of the stirring vane 9 are attached to the drive shaft 8, Thereby constituting the stirring apparatus 10 according to the embodiment.

Using the stirrer 10 of the present invention in the filtration tank of the tester specification,

· Wing diameter

· Wing height position

· Rotational speed

The stirring power, the current value, and the filter material lifetime by the filter material agitation by changing the specification of the filtration material, and the comparative test with the stirring device 110 of the conventional filter material was conducted.

First, the blade diameter d of the stirring apparatus 10 according to the embodiment of the present invention was compared and examined by using φ290, φ320, φ400, and φ500.

Table 1 shows the performance comparison between the number of revolutions and the current value by the blade diameter d of the agitating blade 9 in the agitation apparatus 10 according to the embodiment of the present invention. The larger the blade diameter d of the filter medium 2 is, the better the flow of the floating filter medium 3 in the lower portion of the filter chamber 2 is, and as shown in Table 1, the number of rotations and the current value can also be lowered.

Figure 112013076609130-pct00001

Using the stirring device 10 according to the embodiment of the present invention in which the blade diameter d of the stirring blade 9 is 299, the diameter of the filter layer 5 forming the filter layer 5, which is 417 mm below the bottom surface 5a, Performance comparison was made between the blade position of the stirring device 110 and the wing position provided close to the bottom surface 5a of the filter layer.

The stirring device 10 is improved in movement of the floating filter medium 3 above the filter chamber 2 forming the filter material layer 5 as the filter medium layer 5 is disposed closer to the bottom surface 5a of the filter layer, The flow of the floating filter medium 3 of the filter is deteriorated. This is because, when the agitating device 10 is installed above the filter chamber 2, the vertical swirling flow generated by the agitator 10 can not be applied to the lower portion of the filter chamber 2. [

8 is a side view for comparing the heights of the stirring vane 9 as a reference and the stirring vane 9 according to the embodiment of the present invention is different from the height of the stirring vane 109 of the conventional stirring device 110 (At a position lower by 126 mm from the lower surface 5a of the filtration layer of the filter material layer 5). The wing position of the stirring wing 9 is set at a position 292 mm higher than the height of the stirring wing 109 of the conventional stirring device 110 so that the outlet end 9b of the stirring wing 9 is extended obliquely upward 6, the stirring device 10 causes a swirling flow in the transverse direction to act on the floating filter medium 3 in the upper portion of the filter chamber 2 and generates a swirling flow in the vertical direction throughout the filtration tank 1 It is confirmed that the floating filter medium 3 can be efficiently cleaned and agitated by allowing the entire filter 2 to flow.

Figure 112013076609130-pct00002

The filter material was cleaned by setting the blade diameter d of the stirring blade 9 of the conventional stirring device 110 (conventional example) and the stirring device 10 according to the embodiment of the present invention to? 290,? 320,? 400, The abrasion test of the filter medium at the time of washing was confirmed.

Table 2 shows the cumulative ratio of the amount of filter medium debris on the drainage side, and the ordinate axis represents the ratio (%) of the total weight of the filter medium debris to the initial weight and the number of times of cleaning on the abscissa. The filter medium debris is a contaminant in which a part of the filter medium is broken and peeled off when the floating filter medium 3 is washed.

For example, when the ratio of the total weight of the filter medium debris in the floating filter medium 3 exceeds 18%, the replacement target of the floating filter medium 3 is the target. However, in the conventional stirring device 110, In 2000, the total ratio of filter media residue exceeded 18%, which is the target of exchange, necessitating exchange. However, in the stirring apparatus 10 according to the embodiment of the present invention, even if cleaning is performed 3,000 times or more, the total ratio of the filter material debris does not reach 18% which is the exchange target. Particularly, when the stirring blade 9 has a blade diameter d of? 400 and the number of revolutions is 300 rpm, the floating filter material 3 wears the least, and even when compared with the conventional stirring device 110, / 2 or less. Therefore, it was confirmed that the lifetime of the floating filter medium 3 is longer than that of the conventional stirring device 110.

Figure 112013076609130-pct00003

Table 3 shows the results of the performance comparison between the conventional stirring device 110 (conventional example) having the same cleaning effect and the stirring device 10 according to the embodiment of the present invention. When the blade diameter d of the agitation apparatus 10 according to the embodiment of the present invention is? 400, the floating filter medium 3 moves well during cleaning of the filter medium and the use power And the life of the filter medium can be extended.

The stirring device 10 according to the embodiment of the present invention is characterized in that a plurality of flat blade stirring blades 9 are attached to a driving shaft 8 provided upright on the bottom bottom 1a of the stirring blade 9, (Outflow end) 9b extending diagonally upward. As a result, swirling flows in the horizontal direction and in the vertical direction are generated at the same time, so that the floating filter medium 3 forming the filter material layer 5 can circulate through the filter chamber 2 and the cleaning of the floating filter medium 3 The stirring effect is high, the floating filter medium 3 is not damaged, and the resistance of the stirring blades 9 is also small, so that power reduction is achieved.

Further, the stirring device 10 according to the embodiment of the present invention can be applied to a filter for purifying wastewater generated in a sewage treatment plant, industrial wastewater, or a lake, a marsh or a river, so that high-speed filtration and precision filtration are possible do.

Although the embodiments and examples of the present invention have been described, the present invention is not limited to the above-described embodiments and examples, and various modifications are possible. The present invention is not limited to the dimensions exemplified in the embodiments and examples.

1: Filtration tank 1a: bottom of the tank
2: Fruit Fruit
3: floating filter medium
4: Supply pipe
5: Filter material layer 5a: Filter layer
6: Collecting nozzle
7: house water pipe
8:
9: stirring blade 9a: inflow end 9b: outflow end 9c:
10: stirring device
11: Actuator
20: Filter
110: Conventional stirring device

Claims (16)

(Raw material liquid) is supplied to a filtration tank (filtration tank) having a hermetically sealed filtration chamber for containing a floating filter material (floatation filtration material), and the filtration material layer (filtration material layer) A filter for performing solid-liquid separation (solid-liquid separation) of a stock solution, comprising: a stirring device for stirring the floating filter medium;
A drive shaft installed upright on a bottom portion of the filter chamber,
A plurality of plate-like rectangular stirring blades attached to the drive shaft and extending obliquely upwardly in the rotational direction of the drive shaft relative to the drive shaft and having an outflow end extending obliquely upward; blade which is disposed in the vicinity of the lower surface of the filter layer of the filter material layer to generate a horizontal flow and a rising flow of the vertical line simultaneously with respect to the water storage of the filter chamber
And having,
The diameter formed by the plurality of stirring blades is 30 to 60% of the inner diameter of the filter chamber,
The uppermost portion of the stirring vane is located at a height of 40 to 65% of the filter chamber,
The number of stirring wings is three
Stirring device.
The method according to claim 1,
Wherein the stirring vane has an inclination angle of 30 ° to 40 ° with respect to a plane perpendicular to the rotation axis of the drive shaft and widening in the radial direction of the rotation axis.
3. The method according to claim 1 or 2,
Wherein the stirring vane has an R-shaped corner portion at an inlet end (inlet end) and the outlet end.
delete delete delete A filtration tank having a hermetically sealed filter chamber for receiving the undiluted solution,
A floating filter medium accommodated in a discharge side of the treated water in the filter chamber and forming a filter medium layer for solid-liquid separation of the stock solution;
A drive shaft provided upright on a bottom portion of a feed side of the stock solution of the filter chamber,
Is attached to the drive shaft, with respect to the drive shaft extends in an oblique upper side of the rotation direction rear side of the drive shaft, obliquely to a plurality of the stirring blade of the flat plate shape of a rectangle having an outflow end extends upward, the filtration of the filter medium layer layer when the stirring blades arranged in the vicinity
Equipped ,
The diameter formed by the plurality of stirring blades is 30 to 60% of the inner diameter of the filter chamber,
The uppermost portion of the stirring vane is located at a height of 40 to 65% of the filter chamber,
The number of stirring wings is three
filter.
8. The method of claim 7,
Wherein the stirring vane has an inclination angle of 30 to 40 degrees with respect to a plane perpendicular to the rotation axis of the drive shaft and widening in the radial direction of the rotation axis.
9. The method according to claim 7 or 8,
Wherein the stirring vane includes an R-shaped edge portion at an inlet end and an outlet end.



delete delete delete The method according to claim 1,
Wherein the stirring blade extends in a direction away from the rotation axis of the drive shaft.
The method according to claim 1,
Wherein the stirring vane is attached to the drive shaft in the vicinity of an end side surface of the stirring vane.
8. The method of claim 7,
Wherein the stirring blade extends in a direction away from a rotation axis of the drive shaft.
8. The method of claim 7,
Wherein the stirring blade is attached to the drive shaft in the vicinity of an end side surface of the stirring blade.
KR1020137022262A 2011-04-25 2011-04-25 Buoyant filter medium-stirring device and filter KR101896891B1 (en)

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JP2003144883A (en) * 2001-11-08 2003-05-20 Clion Co Ltd Agitating apparatus and method for manufacturing mixture

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AU2011366387B2 (en) 2016-06-16
CN103501872A (en) 2014-01-08
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AU2011366387A1 (en) 2013-08-29
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KR20140017558A (en) 2014-02-11
TWI510278B (en) 2015-12-01

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