JP2001054726A - Agitation blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a satisfactorily fluidized state of the whole contents in a tank with a simple structure by incorporating in the titled blade a disk having a boss to be fit to a rotary shaft in the center part and plural lower blades which are fit onto the undersurface of the disc almost in the radial directions and the lower parts of which are bent obliquely downward in the rotation direction. SOLUTION: A rotation blade 1 consists of the disc 2 and plural lower blades 3. The boss 4 is fixed to the disc 2 so that the rotary shaft can be fit to the periphery of a penetrated hole provided in the center part. Each of the blades 3 consists of an upper zonal vertical plate-shaped part 3a and an oblique plate- shaped part 3b connected to the lower edge of the part 3a. The part 3b is formed so that the width is gradually made narrower as it goes from the inside to the outside. The part 3b is attached to the undersurface of the disc 2 to be freely attached/detached at the little advanced position in the rotation direction from a radial line X passing through the center of the disc 2 by a means such as a bolt and nut so that the part 3b faces obliquely downward in the rotation direction of the blade 1. When this rotation blade is used, the satisfactorily fluidized state of the whole contents in the tank can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring blade suitable for use in a wastewater treatment facility for activated sludge treatment.

[0002]

2. Description of the Related Art In a wastewater treatment facility using activated sludge, organic matter in wastewater is decomposed and removed by aerobic microorganisms. In order to promote the activity of the aerobic microorganisms, a large amount of wastewater is generated. And the wastewater must be sufficiently stirred and fluidized.

Conventionally, as shown in FIGS. 11 and 12, a band-like blade b is inclined on the outer peripheral surface of a boss a, and a stirring blade c fixed at a root portion is half-submerged in wastewater to be rotated and rotated to perform aeration and stirring. I was going to do it.

[0004]

According to this conventional stirring blade c, the gas absorption efficiency is high because of the surface aeration method, but the fluidization in the entire tank is poor due to the weak suction capacity of the wastewater in the tank. And so on.

An object of the present invention is to solve such a problem and to provide a stirring blade having a simple structure and having good fluidization of the whole inside of a tank.

[0006]

In order to achieve the above object, the present invention provides a disk having a boss on which a rotating shaft is fitted at a central portion, and a lower portion which is attached to the lower surface of the disk substantially radially to rotate. And a plurality of lower wings bent obliquely downward in the direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS.

FIGS. 1 to 3 show one embodiment of a stirring blade 1.
The stirring blade 1 includes a disk 2 and a plurality of lower blades 3, and the disk 2 has a boss 4 to which a rotating shaft can be fitted fixed on the periphery of a through hole at the center thereof. Reference numeral 3 denotes an upper band-shaped vertical plate-like portion 3a and an inclined plate-like portion 3b continuously provided from a lower end of the vertical plate-like portion 3a, and the width of the inclined plate-like portion 3b is directed outward from inside. Are formed so as to gradually narrow in accordance with the following.

As shown in FIG. 3, the lower wing 3 is positioned so that the inclined plate portion 3b is directed obliquely downward in the rotation direction of the stirring blade 1 and is slightly advanced from the radiation X passing through the center of the disk 2. The disk 2 is detachably attached to the lower surface of the disk 2 by bolts and nuts or other means.

FIGS. 4 to 6 show another embodiment in which such a disk 2 is modified from one embodiment of the stirring blade 1 having a radius coinciding with the outer end of the lower blade 3, and FIG. Wing 1a
The lower wing 3 is attached to a disk 2a having a small radius.

When the lower blade 3 is immersed in the wastewater treatment liquid A in the aeration tank 5 and rotated in the direction of arrow B as shown in FIG. 8, the inclined blade 1 of the lower blade 3 The liquid A scooped up by the lower wing 3 b
As shown in FIG. 7C, it is forcibly extruded outward by a and scatters from the circumference of the disk 2 into a thin film as shown in FIG. Moreover, since the inclined plate-shaped portion 3b has a large width on the inner side and a narrow width on the outer side, the scooping of the liquid A on the inside is strong, and the scooping of the liquid A on the outside is weak. Since the blade 3 is attached to the lower surface of the disk 2 at a position slightly advanced in the rotation direction from the radiation X, the thin film is efficiently scattered, and thus the center portion of the stirring blade 1 as shown in FIG. The lifting capacity of the lower liquid A is increased, so that the liquid A can be circulated well even in a tank with a deep liquid depth, and the fluidization of the entire tank becomes good and good gas absorption performance can be obtained. .

When the stirring blade 1a of the other embodiment is half-submerged and rotated in the liquid A in place of the stirring blade 1 of the first embodiment in the same manner as described above, the thin film-like scatter is strong as shown in FIG. Become.

That is, by preparing disks 2 of various diameters, selecting one of these disks 2 and attaching the lower wing 3,
Various scattering states of the thin film can be controlled.

Further, as shown in FIG. 9, a high-discharge type special blade 6 is combined with the stirring blade 1 and a lower portion of the tank 5, or FIG.
Radial baffle 7 provided on the bottom of stirring blade 1 and tank 5
When combined with the above, fluidization of the entire inside of the tank is further improved, and more excellent gas absorption performance is obtained.
Reference numeral 8 denotes a rotation axis of the stirring blade 1.

In the embodiment described above, an example is shown in which four lower wings 3 are mounted on the disk 2 or 2a, but a plurality of lower wings 3 may be mounted according to use conditions.

[0016]

As described above, according to the present invention, even with a deep tank, the fluidization and gas absorption performance of the entire tank can be improved by the stirring blade having a simple structure.

[Brief description of the drawings]

FIG. 1 is a front view of a stirring blade according to one aspect of one embodiment of the present invention.

FIG. 2 is a plan view of the stirring blade.

FIG. 3 is a bottom view of the stirring blade.

FIG. 4 is a front view of a stirring blade according to another embodiment.

FIG. 5 is a plan view of the stirring blade.

FIG. 6 is a bottom view of the stirring blade.

FIG. 7 is an explanatory view of a state in which the stirring blade of the present invention is substantially submerged in the liquid.

FIG. 8 is an explanatory diagram showing a flow state of a liquid by a stirring blade of the present invention in a tank.

FIG. 9 is an explanatory diagram showing a flow state of a liquid in a combination of a stirring blade of the present invention and a high discharge type special blade in a tank.

FIG. 10 is an explanatory diagram showing a flow state of a liquid in a combination of a stirring blade of the present invention and a radial baffle in a tank.

FIG. 11 is a plan view of a conventional stirring blade.

FIG. 12 is an explanatory view of a state in which the stirring blade is substantially submerged in the liquid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Stirrer blade 2, 2a Disk 3 Lower blade 3a Vertical plate portion 3b Inclined plate portion 4 Boss

Claims (5)

[Claims] 1. A disk having a boss to which a rotating shaft is fitted at a center portion, and a plurality of lower portions which are attached to the lower surface of the disk substantially radially and whose lower portion is bent obliquely downward in the rotation direction. A stirring blade characterized by comprising a blade. 2. The stirring blade according to claim 1, wherein the lower blade comprises a vertical plate-like portion and an inclined plate-like portion connected to a lower end of the vertical plate-like portion. 3. The stirring blade according to claim 1, wherein the width of the inclined plate portion is reduced as the width is changed from the inside to the outside. 4. The agitating blade according to claim 1, wherein the lower blade is attached to a position on a forward side in a rotational direction on a lower surface of the disk. 5. The apparatus according to claim 1, wherein the lower wing is detachably mounted on the disk having various diameters.
The stirring blade according to claim 1.