JP3197179B2 - Stirrer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirrer for stirring and mixing a substance such as a high-viscosity fluid, a slurry-like substance, a powder, and the like. It is suitable as a polycondensation reactor for polyester, polycarbonate, polyamide or the like, or as a mixer for various raw materials in the food industry.

[0002]

2. Description of the Related Art In the chemical industry and the food industry, a stirrer is often used for mixing or reacting substances such as high-viscosity fluids, slurry-like substances, and powders. In order to treat such a substance, an apparatus having a high mixing performance and a high heat transfer performance and a function that does not generate deposits, that is, a device having a self-cleaning function is often desired.

For this reason, a stirrer having a self-cleaning function has been conventionally proposed as a device for treating a substance having particularly strong adhesion. Generally known as a self-cleaning mechanism, two or more rotating shafts are provided, and agitators attached to them, and the agitator and the inner wall of the container are relatively moved while maintaining a small clearance. It is intended to completely prevent the formation of deposits mechanically.

Conventionally, as a device for completely preventing the formation of deposits, a device in which a multi-axial screw screw is engaged or a paddle having a spindle-shaped section (convex lens-shaped section) is engaged. And a multi-axis stirring device in which a paddle having a pseudo-triangular cross section is engaged.

[0005]

In a conventional apparatus of this type, a large volume is occupied by a stirring body such as a screw screw provided in a container or a paddle having a spindle-shaped or pseudo-triangular cross section. However, there is a problem that the effective volume of the container excluding is limited to several percent to 60%.

As a result, the total volume of the stirrer must be large with respect to the charged amount of the processing substance, and the cost is high, so that practical application is sometimes difficult. If the storage time is long, the total volume of the apparatus with respect to the processing amount becomes enormous, which is a fatal disadvantage in terms of the apparatus cost.

The present invention solves such a problem in the conventional stirring device, and provides a stirring device which can increase the effective volume ratio without impairing the mechanical self-cleaning function. That is the task.

[0008]

In order to achieve this object, according to the present invention, there are provided a plurality of rotating shafts arranged in parallel in a cylindrical container and driven to rotate in the same direction at the same speed; The following configuration is employed in a stirrer including a plurality of paddles fixed to each rotating shaft and performing a stirring action.

[0009] That is, the paddle has a substantially triangular knot shape, with mounted on the rotary shaft at intervals in the axial direction, the three previous <br/> end of a substantially triangular knot shape of the paddles A structure in which three scrapers having a length substantially corresponding to the interval are mounted in parallel with the rotation axis, and a shaft cover having a substantially triangular conical section is mounted between adjacent paddles. adopt.

[0010]

The stirrer according to the present invention has the above-mentioned structure, and the paddle and the scraper are moved in the container by the driving rotation of the rotating shaft, and the substance to be stirred in the container is stirred and mixed.
Since the paddles are spaced apart and the scrapers are also only provided at the paddle tips, they occupy a small volume in the container, thus increasing the effective volume ratio.

[0011] Further, the movement of the paddle and the scraper causes the adjacent ones to move relatively close to each other, and the respective parts in the container are self-cleaned.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a stirrer according to the present invention will be described in detail with reference to the embodiments shown in FIGS. 1 to 3, a cylindrical container 11 is formed in a cocoon shape formed by combining two circles of the same size with a part of a cross section cut away. At the center of the two circles formed, two round shafts 12, 13 are supported in parallel with each other. The rotating shafts 12 and 13 are configured to be rotationally driven by a driving source (not shown) in the same rotational direction and at the same rotational speed in synchronization with each other as shown by arrows in the figure.

The inner wall of the container 11 has a cocoon-shaped cross-section that connects two cylindrical walls 111, 112 centered on the rotating shafts 12, 13, respectively. In addition, the rotating shaft 12,
Reference numeral 13 has shaft covers 121 and 131 having a substantially triangular conical section on the outer periphery.

A plurality of paddles 21 to 23 are fixed to the rotating shaft 12 at predetermined intervals. Each paddle 21-
Reference numeral 23 is formed in a thick plate shape having a substantially triangular conical section, and is attached to the rotating shaft 12 along a plane orthogonal to the rotating shaft 12.

Further, the pointed ends of these paddles 21 to 23 can face the inner cylinder wall 111 of the container 11 or the corresponding paddles 31 to 33 described later with a slight clearance in accordance with the rotational angle position. The dimensions are selected as follows.

On the other hand, a plurality of paddles 31 to 33 having a substantially triangular conical cross section are similarly fixed to the rotating shaft 13. The paddles 31 to 33 are respectively the paddles 21 to 2
3 and is attached to the rotating shaft 13 at a position shifted by a predetermined interval in the axial direction. Further, the size of each point of each paddle 31 to 33 is selected such that it can face the cylindrical wall 112 of the container 11 or the corresponding paddles 21 to 23 with a slight clearance depending on the rotational angle position. ing.

Further, scrapers 41 to 43 and 51 to 53 having a pseudo-triangular cross-section corresponding to the cross-sectional shape of each of the paddles 21 to 23 and 31 to 33 are parallel to the rotary shafts 12 and 13, respectively. It is fixed to. The tip surfaces of the scrapers 41 to 43 and 51 to 53 face the adjacent paddles 21 to 23 and 31 to 33 with a slight clearance in the axial direction.

Since each of the scrapers 41 to 43 and 51 to 53 has the same configuration, the paddle 22 will be described in detail as a representative. A total of six scrapers 42 are mounted on both ends of the paddle 22 at the tip end, and the paddles 22 on both sides are mounted. The tips can be opposed to the side surfaces of the paddles 31 and 32, respectively.

The leading edge of each scraper 42 is located on the same line as the corresponding tip of the scraper 42, so that the leading end of each scraper 42 is separated from the container by a slight clearance according to the rotational angle position of the rotating shaft 12. It may face a shaft cover 131 having a surface that is continuous with the eleven cylindrical walls 111.

Also, as shown in FIG.
The scrapers 51 and 52 attached to the adjacent paddles 31 and 32 are adapted to enter between the shaft cover 121 and the paddles 31 and 32 in accordance with the rotation. And scrapers 51 and 5
The dimensions are selected so that the peripheral surface on the center side of the shaft 2 is close to the peripheral surface with a slight clearance.

FIG. 3 is a perspective view schematically showing the arrangement of the paddles, scrapers and shaft covers.

In such a stirring device, the substance to be stirred is introduced into the container 11 from an inlet (not shown),
The paddles 21 to 23 and 31 are driven and rotated by the paddles 21 to 23 and 31.
To 33 and the scrapers 41 to 43 and 51 to 53 are agitated by the movement, and then taken out from an outlet (not shown).

Here, as can be seen from the sectional view of FIG. 2, the volumes occupied by the rotating shafts 12, 13 and the scrapers 41 to 43, 51 to 53 are small, and the paddles 21 to 23, 31 to 3 are small.
3 are also mounted at intervals, so that the effective volume ratio in the container 11 can be greatly increased as compared with a conventional self-cleaning type stirring device.

Note that paddles 21 to 23, 3
The mounting intervals of 1-33 are expanded, and the scrapers 41-4
By increasing the length of 3, 51 to 53, the effective volume ratio can be further increased.

On the other hand, each part in the container 11 is self-cleaned by the following cleaning action simultaneously with the stirring action. That is, the inner walls of the container 11 are paddles 21 to 2
3,31-33, and scrapers 41-43,5
The cleaning is performed by the pointed edges 1 to 53 moving close to each other. Further, the curved peripheral surfaces of the paddles 21 to 23 and the paddles 31 to 33 are cleaned by their tips moving close to each other.

Further, the flat side surfaces of the paddles 21 to 23 and 31 to 33 and the scrapers 51 to 51 respectively opposed thereto.
The tip surfaces 53, 41 to 43 are mutually cleaned by moving close to each other. For example, paddle 2
The two planar side surfaces move relatively close to the tip surfaces of the scrapers 51 and 52, and their opposing surfaces are cleaned from each other.

Also, the scrapers 41 to 43, 51 to 53
Are cleaned from each other as the scrapers 41 to 43 and 51 to 53 move their tips and the peripheral surface close to each other. Thus, the paddles 21 to 23, 31 to 33 and the scraper 41 by the rotation of the rotating shafts 12 and 13 are provided.
By the relative movements of to 43 and 51 to 53, all surfaces in the container 11 can be completely cleaned.

Although two rotating shafts are provided in the above embodiment, the present invention is not limited to two rotating shafts.
It is possible to provide more than this, and the same effect as described above can be obtained.

[0029]

In summary, the stirrer according to the present invention has a plurality of rotating shafts arranged in parallel in a cylindrical container and driven to rotate in the same direction at the same speed, and fixed to each of the rotating shafts. A stirrer comprising a plurality of paddles that perform a stirring action, wherein the paddle has a substantially triangular conical shape, and is attached to the rotating shaft at an axial interval.
Three scrapers having a length substantially equivalent to the interval are attached to three substantially triangular rib-shaped tips of the paddle in parallel with the rotation axis, and a cross section between the adjacent paddles has a substantially triangular rib shape. The shaft cover is attached.

Therefore, there is an effect that the effective volume ratio of the stirring device can be increased without impairing the mechanical self-cleaning function. In addition, an increase in the effective volume ratio has the effect of improving the production efficiency of the stirring device, and is extremely useful in industry.

[Brief description of the drawings]

FIG. 1 is a sectional view of a stirring device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is an explanatory perspective view schematically showing an arrangement state of a shaft cover, a paddle, and a scraper constituting a stirring device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Container 12 Rotation axis 13 Rotation axis 21-23 paddle 31-33 paddle 41-43 Scraper 51-53 Scraper 111,112 Inner cylinder wall 121,131 Axis cover

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shimata Takashi ▼ Fumi 4-6-22 Kannon Shinmachi, Nishi-ku, Hiroshima City Inside the Hiroshima Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Setsuo Omoto Kannon Shinmachi 4, Nishi-ku, Hiroshima City No. 6-22, inside the Hiroshima Laboratory, Mitsubishi Heavy Industries, Ltd. (56) References JP-A-63-232828 (JP, A) JP-A-2-178364 (JP, A) (58) Fields investigated (Int. . ^7, DB name) B01F 7/04

Claims (1)

(57) [Claims] 1. A plurality of rotating shafts arranged in parallel in a cylindrical container and driven to rotate in the same direction at the same speed, and a plurality of paddles fixed to the respective rotating shafts and performing a stirring action. In the stirring device provided, the paddle has a substantially triangular conical shape, and is attached to the rotating shaft at an interval in the axial direction .
At each end, three scrapers having a length substantially corresponding to the interval are attached in parallel with the rotating shaft, and a shaft cover having a substantially triangular conical section between the adjacent paddles is provided. A stirrer characterized by being attached.