JPH04104827A - Agitator - Google Patents

Abstract

PURPOSE:To clean the whole surface of an agitating body and to reduce the volume of the agitator in comparison to the amt. of a material to be treated by providing plural three impeller-type agitating bodies opposed to one another to plural rotating shafts rotating at the same speed in the different directions from one another and provided in parallel. CONSTITUTION:Plural rotating shafts 2a and 2b rotating at the same speed in the different directions from one another are provided in parallel in a cylindrical vessel 1 having the inlet and outlet for the raw material. Three thick impeller-type agitating bodies 3a-3a'' and 3b-3b'' are fixed to the respective rotating shafts substantially vertically to the shafts so that the rotating courses of the tips cross each other and the agitating bodies are rotated while out of contact with each other and leaving a slight gap. The plural agitating bodies are fixed to each rotating shaft while shifting the phase successively in the rotating direction and leaving a slight gap. Consequently, the whole surface of the agitating body is cleaned, and the volume of the agitator is remarkably reduced in comparison to the charge of the material to be treated.

Description

Detailed Description of the Invention [Second Industrial Fields of Application] The present invention is applicable to polymerization reactions for producing synthetic resins and synthetic fibers, particularly in cases where the reaction rate is controlled by reaction by-product evaporation, such as in polycondensation reactions. The present invention also relates to a stirring device used when removing a solvent or the like from a high clay liquid.

[Background Art] In the chemical industry and the food industry, stirring devices are often used to mix and react high viscosity fluids, slurry substances, powders, and the like. To process such materials,
It is often desired to have an apparatus that has high mixing performance and heat transfer performance, and also has a function that does not generate deposits, that is, a self-cleaning function.

For this reason, stirring devices with a self-cleaning function have been proposed for treating highly adhesive substances. Stirring devices having a self-cleaning function are generally classified into two types. Those in the first category have two or more rotation axes, and the stirring bodies attached to them move with relative speed while maintaining a slight clearance between each other and the stirring body and the inner wall of the container. The aim is to completely prevent the formation of deposits. Those in the second category take into consideration the flow state of the substance to be handled and attempt to suppress the formation of adhering substances by the shearing action of the fluid itself.

In recent years, the quality of products has become more stringent in the chemical industry, and the properties of substances handled have become more diverse, so equipment in the second category is insufficient to prevent adhesion. In many cases, the demand for equipment in the first category is increasing.

The first category of stirring devices includes those with multi-screws meshed together, and those described by Todd, D., B et al. in Ch.
em, Eng, Progr, vol. 165. p.54
(1969), which has meshed paddles with a convex lens-like cross section, and a multi-axis stirring device that has meshed paddles with a pseudo-triangular cross section.

1. Problems to be Solved by the Invention] However, the biggest drawback of the conventional stirring devices of the above-mentioned first category is that Large volume,
The effective volume excluding this is small. the result,
The total volume becomes large relative to the amount of processed material charged, resulting in high costs, which makes it difficult to apply in practice.

Particularly when the residence time required for treatment is long, the total volume of the apparatus becomes enormous compared to the throughput, which is a fatal drawback in terms of apparatus cost.

The present invention aims to provide a stirring device that can solve the above problems.

[Means for Solving the Problems] The stirring device of the present invention includes a plurality of rotating shafts that rotate at the same rotational speed in different directions arranged in parallel in a cylindrical container having a raw material supply port and a discharge port. The thick-walled three-blade type stirrer is mounted substantially perpendicularly to each rotating shaft, so that the rotation trajectories of their tips intersect and can be rotated with a small gap without contacting each other. The invention is characterized in that a plurality of the stirring bodies are attached to each rotating shaft with a slight gap while sequentially shifting the phase in the direction of the rotating shaft.

[Operation] In the present invention, the processing material supplied from the raw material supply port into the cylindrical container is rotated in parallel to a plurality of parallel rotating shafts that rotate at the same rotational speed in different directions. Stirring by attached thick-walled three-blade type stirring body
mixed. This stirring body is arranged in a plurality of pieces sequentially out of phase with each other in the direction of the rotation axis, so it is possible to process '! ! The 71 substances move in the axial direction of the rotating shaft while being stirred and mixed, and are discharged from the discharge port.

The opposing agitating bodies are installed so that the rotation trajectories of their tips intersect and rotate with a slight gap without contacting each other, so that stirring and mixing by the opposing agitating bodies is performed efficiently. At the same time, cleaning is performed by rotating the opposing stirring bodies with a small gap between them, so that the processing substance does not adhere to the stirring bodies.

In addition, since the stirring body is a three-blade type and is installed as described above, the volume occupied by the stirring body in the container is small, and as a result, the capacity of the device is small compared to the amount of material to be processed. It is possible to reduce the total volume and avoid high costs.

1 Embodiment] Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 3.

Two rotating shafts 2a and 2b are arranged in parallel in a cylindrical container l, and each rotating shaft rotates at the same rotational speed in different directions as shown by the arrows in the figure. do. The rotating shaft 2a has thick-walled stirring bodies 3a, 3a'38', .
・ are respectively attached perpendicularly to the rotating shaft 2a, and stirring bodies 3a, 3a3b'', . . . are attached to the rotating shaft 2b.
Similarly, the stirring bodies 3b3b' are placed in the digits corresponding to 1.
, 3B,... are installed. Each stirring body 3a3
a', 3a'', .
The sleeves 4a and the rotating shaft 2a are fixed to each other by a key structure or the like. Similarly, each stirring body 3b3b' on the rotating shaft 2b side
, 3b'', . . . are fixed to the rotating shaft 2b via a Wi stirring body fixing sleeve 4b.

Stirring bodies 3a, 3a' attached to the rotating shaft 2a,
3a'... are arranged at positions corresponding to the stirring bodies 3b, 3b', 3b''... attached to the rotating shaft 2b, respectively, as described above, that is, at positions so as to be in phase with each other, and this relative stirring bodies 3a, 3b, 3a', 3
3a1.3 of b', 3a', 3b"...
b' is shown in FIG.

Further, the cross section of the inner wall of the container 1 has the shape of a combination of two partially cut out circles having the same diameter, and
, 2b are located at the center of one and the other circle, respectively.

Each of the stirring bodies 3a, 3a', 3a', -; 3b
, 3b', 3b', . . . are three-blade type having the same shape, and a stirring member 3a is shown in FIG. 3 as a representative thereof.

As shown in the figure, each stirring body consists of three blades arranged at equal intervals around the rotating shaft 2a, and each blade is concave radially outward from the fixing sleeve 4a or 4b. A pair of curved side circumferential surfaces 3as, 3as which form a circular arc shape and extend toward the end, and a circular arc centered on the axis of the rotating shaft so as to rotate with a slight gap on the inner wall of the container 1 having a circular cross section. The outermost circumferential surface 3a of the tip of the blade, and a connecting portion 3az connecting the tips of these side circumferential surfaces 3a3 and the ends of the outermost circumferential surface 3a+. In addition, in the position shown in FIG. 2, the outermost circumferential surface 3a1 of one blade of the stirring body 3bi and the connecting portion 3az are located between the adjacent side circumferential surfaces 3a3.3as of two blades of the opposing stirring body 38''. Position to,
Opposing stirring bodies 3a, 3b; 3a', 3b'
; 3a', 3b', . . . are constructed and arranged so that the rotation trajectories of their tips intersect as they rotate, and the opposing stirring bodies rotate with a slight gap between them without coming into contact with each other. .

In FIG. 3, a line 5 indicates the rotation locus of the tip of the stirring body 3b facing the stirring body 3a relative to the stirring body 3a.

These stirring bodies 3a, 3a', 3a', -; 3b
, 3b'3b'', . . . as shown in FIG. Rotating shaft 2a with a slight gap in the axial direction of 2b
A plurality of sheets are attached to each of 2b.

Further, a raw material container 6 is provided at one end of the container 1, and a product lower is provided at the other end.

In this embodiment configured as described above, the material to be treated is supplied from the raw material 6 into the container 1, and within the container 1, the rotating shafts 2a and 2b are moved in different directions in the same direction by a drive device (not shown). By rotating at a rotational speed, the stirring bodies 3a, 3a', 3a'..., 3b,
Stirring bodies 3a, 3b; 3a', 3b'; 3c in which 3b', 3bi, ... rotate and the substances to be treated are opposed to each other;
, 3c'; - is stirred and mixed. Since the agitating bodies are installed with their phases sequentially shifted in the axial direction of the rotary shafts 2a and 2b, the substance to be treated is sent in the axial direction of the rotary shafts 2a and 2b while being stirred and mixed, thereby producing a product. It is discharged from the lower part.

In this embodiment, as described above, when the rotating shafts 2a and 2b rotate at the same rotational speed in different directions, one of the opposing stirring bodies follows the trajectory shown by line 5 in the third diagram with respect to the other. Move closely and relatively along.

Therefore, a self-cleaning action occurs as described below.

(1) The inner wall of the container 1 has stirring bodies 3a, 3a', 3a''
-, 3b3b', 3bi... are cleaned by the outermost peripheral surface 3a+ of the tip.

(2) Curved side circumferential surfaces 3a3+' of stirring bodies 3a..., 3b...:h outermost circumferential surfaces 3a at the tips of opposing stirring bodies,
cleaned by.

(3) The planar side surfaces of the stirring bodies 3a, . . . , 3b, .

Due to the above-mentioned self-cleaning effect, the treated substances are stirred and mixed without adhering to the stirring body, the inner wall of the container, etc., and are discharged out of the system.

In addition, in this embodiment, since the three-blade type is used as the opposing stirring blade as described above, the volume occupied by the stirring body in the container 1 can be reduced, and therefore, the volume occupied by the stirring body can be reduced. The effective volume inside the container is 60% of the container internal volume.
The total volume of the apparatus can be reduced by as much as ~70%, relative to the amount of material to be treated.

Although the above-mentioned embodiment uses two rotating shafts, the present invention is not limited to this, and the present invention is not limited to this. Since the rotating shaft is provided with a three-blade type agitating body facing each other, all surfaces of the pushing body can be cleaned. Furthermore, since the stirring body occupies a small volume, its effective volume is significantly increased compared to conventional self-cleaning equipment, thereby making the volume of the equipment significantly smaller compared to the amount of material to be treated. I can do it.

[Brief explanation of the drawing]

FIG. 1 is an axial cross-sectional view of a rotating shaft according to an embodiment of the present invention;
FIG. 2 is a sectional view taken along the line A-A in FIG. 1, and FIG. 3 is an explanatory diagram showing the rotation locus of the tips of opposing stirring bodies in the same embodiment. 1... Container, 2a, 2b... Rotating shaft 3a 3a', 3a', 3b, 3b',
3b' - Stirring body. 4a, 4b...Sleeve for fixing the stirrer 5...Rotation locus of the tip of the stirrer 6...Raw material inlet, 7...Product outlet. 3a+...The outermost peripheral surface of the blade of the stirring body. 3az... Connecting part of the blade of the stirring body 3a3... Solidification around the side of the blade of the stirring body Attorney Patent attorney Sakama Akigai 2 people Figure 2

Claims (1)

[Claims] Multiple rotating shafts that rotate at the same rotational speed in different directions are arranged in parallel in a cylindrical container that has a raw material supply port and a discharge port, and are mounted substantially perpendicularly to each rotating shaft. Thick-walled three-blade stirring bodies are installed so that the rotation trajectories of their tips intersect and are rotatable with a slight gap without contacting each other, and the stirring bodies are sequentially arranged in the direction of the rotation axis. A stirring device characterized in that a plurality of pieces are attached to each rotating shaft with a slight gap while shifting the phase.