JPH05293349A - Slow and rapid agitating tank - Google Patents

Abstract

PURPOSE:To perform slow and rapid agitation in one tank to provide sufficient agitation by coaxially fixing a rotating cylinder of diameters different from each other to a rotating shaft, installing a fixed cylinder between the rotary shaft and the rotating cylinder and projectingly providing agitating blades on the rotating shaft and the rotating cylinder. CONSTITUTION:A rotating shaft 11 is vertically inserted into a tank body 1 and a rotating cylinder 14 with one end open and the other end closed of different diameters from each other is coaxially fixed to the rotating shaft 11. And a fixed cylinder 5 with one end closed and the other end open of diameters different from each other is coaxially fixed to the rotating shaft 11 leaving a space between the rotating shaft 11 and the rotating cylinder 14. Agitating blades are projectingly provided on the rotating shaft 11 and the rotating cylinder 14 and plural agitating chambers 16-18 which are bent in order and coaxially communicate with each other are formed between the rotating shaft 11, the rotating cylinder 14, the fixed cylinder 5 and the tank body 1. An original liquid feed opening 3 and a treated liquid discharge opening 7 are provided on the outermost side and the innermost side of the agitating chambers 16-18 respectively. Thus the whole original liquid is sufficiently agitated and mixed.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is used for various other purposes, such as in the case of performing flocculation treatment of sludge in which rapid flocculation and then slow flocculation are performed while adding a flocculant to facilitate dehydration of the flocs obtained. The present invention relates to a rapid stirring tank.

[0002]

2. Description of the Related Art Conventionally, a rapid agitation chamber having a raw water supply port is used as a rapid agitation tank for adding flocculant to sludge generated in sewage treatment, industrial wastewater treatment, etc. to generate flocs by stirring. And an inner rotary shaft that is divided into two upper and lower chambers that communicate with a slow stirring chamber having an upper discharge port, and that are respectively connected to one motor and a speed reducer installed on the upper surface of the tank, and the inner rotary shaft. A hollow outer rotary shaft, which is rotatably fitted to the inner rotary shaft and rotates at a slower speed than the inner rotary shaft, vertically hangs in the slow and quick stirring chamber, and one of the inner rotary shafts should rotate rapidly in the quick stirring chamber. There is known a structure in which a stirring blade is attached to each of the other outer rotating shafts, and a slow stirring blade to be rotated in the slow stirring chamber is attached.

[0003]

However, in the above-mentioned conventional tank, the inner and outer double rotary shafts, and further another rotary shaft for transmitting different rotations from one motor to the inner rotary shaft and the outer rotary shaft. A deceleration mechanism is required, and since the whole tank is a tower type in which a rapid stirring chamber and a slow stirring chamber are connected vertically, a strong support structure is required, which in combination makes them expensive. Regarding the agitation action, since the rapid agitation chamber and the slow agitation chamber are connected in series in the vertical direction, the flow of the raw water is generally linear, which makes it difficult to agitate and mix the raw water as a whole. It was The present invention aims to eliminate the drawbacks of the prior art.

[0004]

As a means for solving the above-mentioned problems, according to the present invention, one rotating shaft connected to a rotation driving means is vertically passed through a tank main body, and one end in the tank main body is inserted. One or a plurality of rotating cylinders having different diameters which are opened and closed at the other end are sequentially fixedly supported on the rotating shaft in a concentric positional relationship outside the rotating shaft, and one end is closed and the other end is closed. Fixed to the tank main body in a state where one or a plurality of fixed cylinders having different diameters, which are open to each other, are fitted with a gap between the rotary shaft and the rotary cylinder or between the inner and outer rotary cylinders, respectively. At least the agitating blades are respectively provided on the rotary shaft and the rotary cylinder so as to form a plurality of agitating chambers that are sequentially bent and concentrically connected to each other between the rotary shaft and the rotary cylinder and the fixed cylinder. , The outermost stirring chamber of the above-mentioned plurality of stirring chambers The supply port, provided the treatment liquid outlet port to each stirring chamber of the innermost proposes a pace stirred tank.

[0005]

In the present invention, when the rotary shaft is rotated, the rotary shaft and each rotary cylinder rotate at the same rotational speed.
Due to the difference in the rotation radius, the stirring blade of the rotating shaft located at the center is the slowest stirring, the stirring blade of the outer rotating cylinder has a higher stirring speed, and the stirring blade of the outermost rotating cylinder is the highest stirring. It becomes rapid stirring. Hereinafter, an example in which the present invention is applied to a slow stirring tank used for sludge flocculation reaction will be described with reference to the drawings.

[0006]

EXAMPLE In FIG. 1, a tank body (1) is a bottom plate (2).
A cylindrical body with upper and lower ends closed, which has a sludge supply port (3)
From the upper plate (4), a fixed cylinder (5) having a diameter of about ½ of the tank body (1) is inserted, and the cylinder (5) hangs concentrically with the tank body (1) and the upper end portion is appropriately adjusted. The fixed cylinder (5) is fixed to the upper plate (4) in a state of protruding upwards.
Is the one in which the lower end is opened and the lower half is tapered downward, and the upper end is closed by the upper plate (6). The coagulated sludge discharge port (7) is provided on the side wall near the upper plate (6). It has been opened.

A support base (8) is fixed on the upper plate (6) of the fixed cylinder (5), and a motor (9) is mounted on the support base (8).
And a rotary drive means composed of a speed reducer (10), and the rotary shaft (11) whose upper end is connected to the output shaft of the speed reducer (10) is connected to the support base (8) and the fixed cylindrical upper plate (6). )
While being supported by the bearings (12) and (13), the lower end of the shaft (11) is hung down to the concentric position in the fixed cylinder (5) from the opening lower end of the fixed cylinder (5) to the tank body. The rotary cylinder (14) is fixed to the projecting end by slightly projecting it into (1).

The rotating cylinder (14) is the tank body (1).
Is a cylindrical body with an upper end opening and a lower end closed, each of which has a diameter substantially corresponding to the inner diameter of the fixed cylinder (5) and the outer diameter of the fixed cylinder (5). And the fixed cylinder (5) with a gap between them, and with the tank body (1) and the fixed cylinder (5) positioned concentrically, the center of the closed bottom plate of the rotary cylinder (14) is It is fixed to the lower end of the rotary shaft (11) with a screw (15), and the stirring blades (19) are attached to the outer peripheral surface of the rotary shaft (11).
Baffle plates (20) are provided on the upper part of the inner peripheral surface and the lower end part of the outer peripheral surface of the fixed cylinder (5), respectively, and the rotating cylinder (14).
Stirring blades (21) are provided on both the inner and outer peripheral surfaces and the bottom surface of the bottom plate, and a baffle plate (22) is projectingly provided at the lower part of the inner peripheral surface of the tank body (1), whereby the rotary shaft (11) and the fixed cylinder (5)
The innermost annular stirring chamber (16) directly communicating with the coagulated sludge discharge port (7) between the fixed cylinder (5) and the rotating cylinder (14) and the flow direction with the stirring chamber (16). 180
The circular stirring chamber (17) that bends once is attached to the rotating cylinder (1
4) and the tank body (1) between the stirring chamber (17) and 180
The outermost annular stirring chambers (18) which are bent once and communicate directly with the sludge supply port (3) are formed. In this example, the stirring chambers (18) and (17) are roughly the rapid stirring chamber, and the stirring chamber (16) is the slow stirring chamber.

A trumpet pipe (2) is provided at the sludge supply port (3).
The sludge supply pipe (24) is connected via 3), the sludge is pumped into the tank from the sludge tank by the pump through the supply pipe (24), and the coagulated sludge discharge pipe is connected to the coagulated sludge discharge port (7). (25) is connected and the discharge pipe (25) extends to the dehydrator of the next step.

The coagulant to be added to the sludge is, for example, an injection pipe (2) connected to the sludge supply pipe (24).
6) an inorganic flocculant, and a cationic polymer flocculant from an injection pipe (27) connected to the trumpet pipe (23).
An anionic polymer coagulant is injected from an injection pipe (28) connected to the upper part of the tank body (1). (29)
Is an in-pipe mixer.

The operation of the above example is as follows. Sludge is pressure-fed into the tank main body (1) through the supply pipe (24) and the trumpet pipe (23), and at the same time, the respective injection pipes (26), (27), (28).
A predetermined coagulant is injected through the motor and with it a motor (9)
When the rotating shaft (11) and the rotating cylinder (14) are rotated by the start of the, the supplied sludge rises in the rapid stirring chamber (18) while being rapidly stirred by the rotation of the stirring blades (21), and then the stirring chamber. At the upper end of (18), it is turned by 180 degrees and flows into the stirring chamber (17), where the stirring blade (2
1) ... descends while being rapidly stirred, and is agglomerated into small-sized flocs by these rapid stirring. Next, the coagulated sludge is turned 180 degrees at the lower end of the stirring chamber (17) and flows into the stirring chamber (16), where it rises while being slowly stirred by the stirring blades (19), and by this slow stirring, small particles are aggregated. The sludge is agglomerated into large, porous flocs that are easily dehydrated, and is sent from the discharge port (7) to the next dehydrator through the discharge pipe (25).

In another embodiment of FIG. 2, a fixed cylinder (30a) is provided outside the rotary cylinder (14) shown in FIG. 1, and stirring blades (32a) ... (32a) ... Rotating cylinders (31a) are sequentially added to form an annular stirring chamber (33
A) and (34a) are concentrically added, and the structure other than the baffle plate is substantially the same as that of FIG.

[0013]

According to the slow stirring tank of the present invention, only one rotary shaft connected to the rotary driving means is required as the rotary shaft extending longitudinally in the tank, and it is necessary to provide another speed reducing mechanism as in the conventional case. Not only does the stirring chamber disappear, but since each stirring chamber is concentrically continuous around the rotation axis, there is no need for a strong support structure like the conventional tank, which provides the advantage that the entire tank can be provided at low cost. In addition, in stirring, since the respective concentrically arranged stirring chambers are sequentially connected by bending and changing the flow direction by 180 degrees, it is possible to achieve sufficient stirring and mixing for the entire stock solution. Its utility value is extremely high.

[Brief description of drawings]

FIG. 1 is a vertical sectional view.

FIG. 2 is a partially omitted vertical sectional view of another embodiment.

[Explanation of symbols]

1, 1a Tank main body 3, 3a Sludge supply port 5, 5a, 30a Fixed cylinder 7, 7a Coagulated sludge discharge port 9 Motor 11, 11a Rotating shaft 14, 14a, 31a Rotating cylinder 16, 16a, 17, 17a, 18, 18a , 33a,
34a Stirring chamber 19, 19a, 21, 21a, 32a Stirring blade

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Fumiyuki Tatematsu 53 Ikeshita, Obata, Ohata, Moriyama-ku, Nagoya, Aichi

Claims (1)

[Claims] 1. One or a plurality of rotating shafts connected to a rotation driving means are longitudinally passed through the tank body, and one or a plurality of mutually different diameters are opened at one end and closed at the other end in the tank body. The rotating cylinder is sequentially fixed to the outside of the rotating shaft in a concentric positional relationship and fixedly supported on the rotating shaft, and one or a plurality of fixed cylinders having different diameters that are closed at one end and open at the other end, The rotary shaft and the rotary cylinder, or the inner and outer rotary cylinders are fixed to the tank body while being fitted with a gap therebetween, and at least the stirring blades are provided on the rotary shaft and the rotary cylinder, respectively. As a result, between the rotary shaft and the rotary cylinder, and the fixed cylinder, a plurality of stirring chambers that are sequentially bent and communicate with each other concentrically are formed, and a stock solution supply port is provided in the outermost stirring chamber of the plurality of stirring chambers. The process liquid discharge ports are provided in the innermost stirring chambers. ,
A gentle stirring tank.