JP6920080B2 - Stirring blade and sludge aggregator - Google Patents

Description

The present invention relates to a stirring blade provided in a sludge aggregating device used in, for example, a water treatment facility, and a sludge aggregating device provided with a stirring blade.

Conventionally, as a stirring blade of this type, for example, as shown in FIG. 12, there is a stirring blade 103 in which a plurality of turbine blades 102 are formed on the peripheral edge of a metal rotating plate 101. The stirring blade 103 is provided on the rotating shaft and is rotatable around the axis 106 together with the rotating shaft.

As shown in FIG. 14, such a stirring blade 103 is manufactured by bending a sawtooth-shaped peripheral edge portion of the rotating plate 101. At this time, the peripheral edge of the rotating plate 101 is bent at 90 ° along the bending line 104 to form the turbine blades 102 alternately up and down.

A stirring blade having a turbine blade as described above is described in, for example, Patent Document 1 below.

International Publication No. WO2016 / 157645A1

However, in the above-mentioned conventional type, when the serrated peripheral portion of the metal rotating plate 101 is bent along the bending line 104, the base portion of the turbine blade 102 is bent at a right angle to the rotating plate 101. This is difficult, and as shown in FIG. 15, an arcuate rounded portion 105 was formed at the base of the turbine blade 102.

Therefore, there is a problem that the position of the turbine blade 102 is displaced outward in the radial direction from the bending line 104 by approximately the radius r of the radius portion 105, and it is difficult to form the turbine blade 102 at an accurate position. rice field.

An object of the present invention is to provide a stirring blade and a sludge aggregating device capable of forming a turbine blade at an accurate position.

In order to achieve the above object, the first invention is a stirring blade in which a turbine blade is formed by bending a serrated peripheral portion of a rotating plate.
The front end of the turbine blade in the rotational direction is inclined rearward in the rotational direction from the base to the tip of the turbine blade.
A notch is provided from the front end in the rotational direction of the base of the turbine blade to the front in the rotational direction.
The notch is inclined inward toward the front in the rotational direction with respect to the tangential direction of the rotating circle passing through the base of the turbine blade.

According to this, by forming a notch at the base of the turbine blade, an arcuate radius is formed to reduce the amount of deviation of the position of the turbine blade from the bending line when the base of the turbine blade is bent. be able to.

The notch is formed from the front end in the rotation direction of the base of the turbine blade toward the front in the rotation direction, and is on the inner peripheral side with respect to the tangential direction of the rotation circle passing through the base of the turbine blade. When the stirring blade is rotating in the stirring target liquid, the residue and the like contained in the stirring target liquid are less likely to be caught in the notch.

Further, even if the residue or the like is caught in the notch, a force acts on the residue or the like in the direction away from the notch (that is, in the direction opposite to the rotation direction) when the stirring blade is rotated. The residue etc. easily comes off from the notch. As a result, the amount of the residue or the like entwined with the stirring blade can be reduced, and a decrease in the stirring capacity can be prevented.

Further, when the stirring blade is rotating in the stirring target liquid, even if the residue or the like contained in the stirring target liquid is caught on the front end of the turbine blade, the residue or the like is caused by the inclination of the front end of the turbine blade. However, it moves to the tip side of the turbine blade and comes off from the tip. As a result, the amount of the residue or the like entwined with the stirring blade can be further reduced.

In the stirring blade of the second invention, the notch portion is inclined at an angle of 80 ° or less with respect to the tangential direction.

The stirring blade in the third invention has a divergent shape in which the notch portion expands toward the outside in the radial direction of the rotating circle.

According to this, the effect that the residue or the like is hard to be caught in the notch portion and the effect that the residue or the like is easily removed from the notch portion become more remarkable.

In the stirring blades of the fourth invention, turbine blades erected toward one surface of the rotating plate and turbine blades erected toward the other surface of the rotating plate alternate in the circumferential direction. It is an array.

According to this, by rotating the stirring blade, each turbine blade is rotated in the stirring target liquid, and stirring having an excellent shearing effect is performed on the stirring target liquid.

The fifth invention is a sludge aggregating device provided with the stirring blade according to any one of the first to fourth inventions.
The coagulated sludge is obtained by stirring the sludge into which the coagulant is injected.

According to this, the sludge into which the coagulant is injected can be efficiently mixed and stirred to obtain the coagulated sludge.

As described above, according to the present invention, by forming a notch at the base of the turbine blade, when the base of the turbine blade is bent with an arcuate radius, the position of the turbine blade deviates from the bending line. The amount of deviation can be reduced. This allows the turbine blades to be formed at the exact location of the rotating plate.

Further, when the stirring blade is rotating in the stirring target liquid, the residue and the like contained in the stirring target liquid are less likely to be caught in the notch. Further, even if the residue or the like is caught in the notch, a force acts on the residue or the like in the direction of separating from the notch when the stirring blade is rotated, so that the residue or the like is likely to come off from the notch. .. As a result, the amount of the residue or the like entwined with the stirring blade can be reduced, and a decrease in the stirring capacity can be prevented.

It is a figure of the sludge coagulation apparatus in the 1st Embodiment of this invention. It is a partially cutout front view of the stirring blade provided in the sludge aggregating device. The same is a perspective view of the stirring blade. The same is a partially enlarged perspective view of the stirring blade. The same is a plan view of the rotating plate before the turbine blades of the stirring blades are bent and formed. It is a partially enlarged view in FIG. It is an enlarged view of the notch part in FIG. The same is an enlarged view of the base portion of the turbine blade when the turbine blade of the stirring blade is formed by bending. It is a partially enlarged perspective view of the stirring blade in the 2nd Embodiment of this invention. It is a partially enlarged plan view of the rotating plate before being formed by bending the turbine blades of the stirring blades. It is an enlarged view of the notch part in FIG. It is a perspective view of the conventional stirring blade. The same is a partially enlarged perspective view of the stirring blade. The same is a partially enlarged plan view of the rotating plate before the turbine blades of the stirring blades are bent and formed. The same is an enlarged view of the base portion of the turbine blade when the turbine blade of the stirring blade is formed by bending.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment)
In the first embodiment, as shown in FIG. 1, reference numeral 1 denotes a sludge aggregating device for obtaining agglomerated sludge by agitating sludge into which a coagulant is injected. The sludge is a slurry-like substance such as sewage sludge, and the coagulant is a polymer coagulant or the like.

The sludge aggregating device 1 has a rapid stirrer 2 and a slow speed stirrer 3 provided above the rapid stirrer 2. The ceiling of the rapid stirrer 2 and the bottom of the slow stirrer 3 communicate with each other at the opening 5.

The rapid stirring machine 2 has a rapid stirring tank 6, a rotating shaft 8 that is rotationally driven by a motor 7 and is provided in the rapid stirring tank 6, and a stirring blade 9 attached to the tip of the rotating shaft 8. doing. A sludge inflow port 11 for supplying sludge 26 is provided on one side of the side wall of the rapid stirring tank 6, and a coagulant supply port 12 for supplying the coagulant 27 is provided on the other side. ..

As shown in FIGS. 2 and 3, the stirring blade 9 has a rotary plate 14 and a plurality of first and second turbine blades 15 and 16 provided on the peripheral edge of the rotary plate 14. Of these, the first turbine blade 15 is erected upward toward the upper surface of the rotating plate 14 (an example of one surface), and the second turbine blade 16 is the lower surface of the rotating plate 14 (an example of the other surface). It is hung downward toward. The first turbine blades 15 and the second turbine blades 16 are arranged alternately in the circumferential direction.

A through hole 17 is formed in the center of the rotating plate 14, a threaded portion formed at the tip of the rotating shaft 8 is inserted into the through hole 17, and a nut 20 is screwed into the threaded portion and tightened for stirring. The blade 9 is attached to the tip of the rotating shaft 8.

In each of the turbine blades 15 and 16, the front end portion 18 of the stirring blade 9 in the rotation direction B is inclined rearward in the rotation direction B from the base portion 19 (base end portion) toward the tip portion.

As shown in FIGS. 3 and 4, the rotary plate 14 is formed with a notch 21 from the front end portion in the rotation direction B of the root portions 19 of the turbine blades 15 and 16 toward the front in the rotation direction B. There is. As shown in FIGS. 6 and 7, each of these notches 21 is a narrow slit-shaped notch, and is an inner circumference with respect to the tangential direction C of the rotating circle 23 passing through the root portions 19 of the turbine blades 15 and 16. It is tilted to the side. The rotating circle 23 is a virtual circle centered on the rotation axis 24 of the stirring blade 9.

Each notch 21 is inclined at an angle D larger than 0 ° and 80 ° or less with respect to the tangential direction C.

When manufacturing the stirring blade 9, as shown in FIG. 5, first, a rotating plate 14 having a saw-toothed peripheral edge portion is manufactured, a notch 21 is formed in the rotating plate 14, and a through hole 17 is formed. Form. After that, the peripheral edge portion of the rotating plate 14 is bent along the bending line 37 to form the turbine blades 15 and 16 as shown in FIGS. 3 and 4. As shown in FIG. 7, the notch 21 is formed radially inward from the bending line 37.

As shown in FIG. 1, the slow-speed agitator 3 is attached to a slow-speed stirring tank 31, a rotating shaft 33 that is rotationally driven by a motor 32 and is provided in the slow-speed stirring tank 31, and a rotating shaft 33. It has a plurality of upper and lower paddle wings 34.

The operation in the above configuration will be described below.

In the bending process when manufacturing the stirring blade 9, since the notch 21 is formed at the base 19 of each of the turbine blades 15 and 16, as shown in FIG. 8, an arcuate radius 38 is attached. When the base portion 19 of the turbine blades 15 and 16 is bent, the amount of deviation of the positions of the turbine blades 15 and 16 from the bending line 37 can be reduced. As a result, the turbine blades 15 and 16 can be formed at the exact position of the rotating plate 14.

As shown in FIG. 1, the sludge 26 is supplied into the rapid stirring tank 6 from the sludge inflow port 11, the coagulant 27 is supplied into the rapid stirring tank 6 from the coagulant supply port 12, and the motor 7 is driven. The stirring blade 9 is rotated together with the rotating shaft 8.

As a result, the flocculant 27 becomes a nucleus for uniformly mixing with the liquid to be stirred in the rapid stirring tank 6 to form agglomerated flocs, and the turbidity in the liquid to be stirred is aggregated around this nucleus. Fine flocs are formed.

Further, as shown in FIG. 4, the notch portion 21 is formed from the front end portion in the rotation direction B of the root portions 19 of the turbine blades 15 and 16 toward the front in the rotation direction B, and is shown in FIG. As described above, the rotating circle 23 passing through the base portion 19 is inclined toward the inner peripheral side with respect to the tangential direction C. Therefore, in the case of rapid stirring as described above, when the stirring blade 9 is rotating in the stirring target liquid, the residue, hair, etc. contained in the stirring target liquid are less likely to be caught in the notch 21.

Further, as shown in FIG. 4, even if the residue 39 or the like is caught in the notch 21, when the stirring blade 9 is rotated, the residue 39 or the like is separated from the notch 21 (that is, the rotation direction). Since a force (reaction force) acts in the direction opposite to B), the residue 39 and the like are likely to come off from the notch 21. As a result, the amount of the residue 39 and the like entwined with the stirring blade 9 can be reduced, and a decrease in the stirring capacity can be prevented.

The closer the angle D shown in FIG. 7 is to 90 °, the easier it is to bend the stirring blade 9, but if it exceeds 80 °, the residue 39 or the like is entangled with the notch 21. It is not preferable because it becomes easy.

Further, when the stirring blade 9 is rotating in the stirring target liquid, even if the residue 39 or the like contained in the stirring target liquid is caught on the front end portions 18 of the turbine blades 15 and 16, the inclination of the front end portion 18 causes the stirring blade 9. , The residue 39 and the like move to the tip side of the turbine blades 15 and 16 and come off from the tip. As a result, the amount of the residue 39 and the like entwined with the stirring blade 9 can be further reduced.

The stirring target liquid that has been rapidly stirred in the rapid stirring tank 6 is then stirred in the slow speed stirring tank 31 by the paddle blade 34 that rotates at a slow speed. As a result, sludge containing fine flocs is gently agitated to coarsen the flocs, and aggregated sludge having appropriate aggregated flocs can be obtained.

(Second Embodiment)
In the second embodiment, as shown in FIGS. 9 to 11, the notch 21 has a divergent shape (V shape) that expands toward the outside in the radial direction of the rotating circle 23 of the stirring blade 9. .. An arcuate rounded portion 41 is formed at the front end portion of the notch portion 21 in the rotation direction B.

According to this, the effect that the residue 39 and the like are hard to be caught in the notch portion 21 and the effect that the residue 39 and the like are easily removed from the notch portion 21 can be obtained more remarkably.

1 Sludge coagulant 9 Stirring blade 14 Rotating plate 15, 16 Turbine blade 18 Front end 19 Base 21 Notch 23 Rotating circle 26 Sludge 27 Coagulant B Rotating direction C Tangent direction

Claims (5)

A stirring blade in which a turbine blade is formed by bending a serrated peripheral edge of a rotating plate.
The front end of the turbine blade in the rotational direction is inclined rearward in the rotational direction from the base to the tip of the turbine blade.
A notch is provided from the front end in the rotational direction of the base of the turbine blade to the front in the rotational direction.
The notch is a stirring blade characterized in that it is inclined inward toward the front in the rotational direction with respect to the tangential direction of the rotating circle passing through the base of the turbine blade. The stirring blade according to claim 1, wherein the notch is inclined at an angle of 80 ° or less with respect to the tangential direction. The stirring blade according to claim 1 or 2, wherein the cutout portion has a divergent shape that expands toward the outside in the radial direction of the rotating circle. A claim characterized in that turbine blades erected toward one surface of a rotating plate and turbine blades erected toward the other surface of a rotating plate are alternately arranged in the circumferential direction. The stirring blade according to any one of items 1 to 3. The sludge aggregating device provided with the stirring blade according to any one of claims 1 to 4.
A sludge aggregating device characterized in that agglomerated sludge is obtained by agitating sludge into which a coagulant is injected.

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