JPH0660434U - Vertical stirring device - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention relates to a vertical stirrer. [Structure] Cylindrical container, cylindrical fluid guide cylinder arranged inside the same cylindrical container and concentric with the same container, rotation axis arranged concentrically with the same container, and substantially perpendicular to the same rotation shaft An arm attached to the arm, a spiral band wing attached to the arm and inserted in the gap between the container and the fluid guide cylinder, and a scraper attached to the arm and arranged at a slight distance from the inner wall of the fluid guide cylinder. A vertical stirring device having.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vertical stirrer, and more particularly, to a mixer for stirring and mixing a liquid substance to obtain a uniform product, and a polymerization reaction device for polymerizing a low-viscosity substance to obtain a high-viscosity polymer substance. It relates to a vertical stirrer which is advantageously applied.

[0002]

[Prior art]

 Conventionally, many types of agitators have been used.For low-viscosity liquids, propellers, turbines, and paddles are generally used. For high-viscosity liquids, spiral band blades (helical ribbon blades), helical screw blades, and anchor type blades are used. It is common. In particular, high-viscosity liquids, which are often handled in polymer manufacturing processes, are more difficult to mix than low-viscosity liquids, and the quality of the product depends on the selection of the stirrer, so the shape must be carefully selected.

As a stirring device that can be used in a wide range from low-viscosity liquids to high-viscosity liquids, there is a helical ribbon blade having a fluid guide tube (draft tube) in a container. The helical ribbon blade with a draft tube has a shape in which the helical ribbon blade is installed in the gap between the inner wall of the container and the outer wall of the draft tube, and is a high-performance operating device with extremely high liquid circulation performance. Further, in the above helical ribbon blade with draft tube, when the liquid surface is located below the upper end of the draft tube, the draft tube is slit as shown in Japanese Patent Application No. 62-022930 in order to secure the circulating liquid of the liquid. There is one provided.

[0004]

[Problems to be solved by the device]

 The helical ribbon blade with draft tube does not have a stirring blade inside the draft tube.Therefore, when handling highly viscous fluid with strong adhesiveness, polymer substances are not allowed on the inner surface of the draft tube (particularly near the upper and lower ends of the draft tube). It may adhere. Further, in the slit draft tube, when the liquid surface is located lower than the upper end of the draft tube, the polymer substance may stagnate or adhere near the liquid surface in the portion without the inner wall surface of the draft tube.

In view of the above-mentioned state of the art, the present invention aims to provide a vertical stirrer in which the problems caused by the conventional vertical stirrer are eliminated.

[0006]

[Means for Solving the Problems]

 The present invention includes (1) a cylindrical container, a cylindrical fluid guide tube arranged inside the same cylindrical container concentrically with the same container, a rotating shaft arranged concentrically with the same container, and substantially the same rotating shaft. An arm mounted at a right angle to the arm, a spiral band wing mounted on the same arm and inserted in the gap between the container and the fluid guide cylinder, and a small distance from the inner wall of the fluid guide cylinder mounted on the arm. A vertical stirrer comprising a scraper provided. (2) The vertical stirrer according to the above (1), wherein the guide tube is provided with a slit. Is.

Hereinafter, examples of the present invention will be given to further clarify the configuration and operation of the vertical stirring device of the present invention.

[0008]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. 1 is a vertical sectional view thereof, and FIG. 2 is a sectional view taken along the line II of FIG. A cylindrical container 1 and a lid 2 of a vertical stirring device are provided with a liquid supply port 3 (or 4) and a liquid discharge port 4 (or 3), respectively, and a rotary shaft concentric with the container 1 from the upper part. 5 is inserted. An arm 6 oriented at a right angle, that is, horizontally, is attached to the rotary shaft 5, and a support rod 7 and a scraper 11 are attached downward from both ends of the arm 6. Further, a fluid guide tube (draft tube) 8 is fixed to the container 1 by a plurality of legs 9 so as to be concentric with the container 1, and a fluid can pass between each leg. . A spiral band wing (helical ribbon wing) 10 is installed in the gap between the draft tube 8 and the container 1, and is attached to the supporting rod 7. The scraper 11 is arranged inside the draft tube 8 with a small distance from the inner wall of the draft tube 8. The helical ribbon blade 10 and the scraper 11 rotate as the rotating shaft 5 rotates.

According to the present embodiment configured as described above, when the liquid is retained in the gap between the draft tube 8 and the main container 1 by the helical ribbon blade 10 when rotated in the direction of the arrow in FIG. Is pushed up to the upper part, further flows down from the upper part inside the draft tube 8 toward the lower part, and then returns to the outside of the draft tube 8 again. By this circulation, the liquid is locally mixed while being sheared by the helical ribbon blade 10, and then flows down in the draft tube 8, but the flow in the draft tube is in the laminar flow region, and the vicinity of the inner wall surface is a wall surface. Because of the frictional resistance, the flow becomes slower than in the central part, so that stagnation near the wall surface and further adhesion are likely to occur. In this embodiment, it is possible to prevent the liquid from staying and adhering by promoting the flow near the wall surface by the scraper 11 which is close to the inner wall.

Conventionally, there has been an example in which a helical ribbon blade or a helical screw blade is provided in the draft tube 8 in order to solve this problem. However, in this case, it is provided in the gap between the main body container 1 and the draft tube 8. Since the discharge flow by the helical ribbon blade or the helical screw blade in the draft tube 8 is smaller than the discharge circulation flow created by the rotation of the helical ribbon blade 10 that is generated, it may become resistance and may deteriorate the circulation performance that is a feature of this device. There is.

Further, in the present embodiment, when the draft tube 8 is provided with the slit 12 as shown in FIG. 3 (see Japanese Patent Application No. 62-022930), there is a liquid surface below the upper end of the draft tube 8. In the operation, the liquid easily stays and adheres to the portion of the inner wall of the draft tube 8 near the liquid surface where there is no slit 12, but this can be prevented by promoting the liquid flow by the scraper 11.

The cross-sectional shape of the scraper 11 is not limited to the rectangular shape as in this embodiment, and a round bar, a pipe (circle or ellipse) or the like can be applied. Further, the gap between the inner wall of the draft tube 8 and the scraper 11 is preferably about 1 to 2 times the gap between the helical ribbon blade 10 and the outer wall of the main body container 1 or the draft tube 8.

[0013]

[Effect of device]

 According to the device of the present invention, by installing the scraper inside the draft tube with a small gap from the inner wall surface of the draft tube, it is possible to prevent adhesion to the inner wall surface of the draft tube without lowering the circulation flow rate as compared with the conventional system. It has become possible.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of the device of the present invention.

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

FIG. 3 is a vertical sectional view of another embodiment of the device of the present invention.

[Explanation of symbols]

 1: Cylindrical container 2: Lid 3: Supply port (or discharge port) 4: Discharge port (or supply port) 5: Rotating shaft 6: Arm 7: Support rod 8: Fluid guide cylinder 9: Leg 10: Spiral band wing 11: scraper 12: slit

Claims (2)

[Scope of utility model registration request] 1. A cylindrical container, a cylindrical fluid guide cylinder arranged inside the same cylindrical container and concentric with the same container, a rotary shaft arranged concentrically with the same container, and substantially the same rotary shaft. An arm attached at a right angle, a spiral band wing attached to the same arm and inserted in a gap between the container and the fluid guide cylinder, and attached to the arm with a slight distance from the inner wall of the fluid guide cylinder A vertical stirrer having a scraper. 2. The vertical stirrer according to claim 1, wherein the guide tube is provided with a slit.