JPS618126A - Stirring apparatus - Google Patents

Abstract

PURPOSE:To obtain a stirring apparatus having a simple structure and effectively preventing the variation in the surface of a liquid level while preventing the rotation of a chemical solution as a whole, by constituting the same so as to surround the periphery of an impeller for forming a stirring stream by a cylinder. CONSTITUTION:An impeller 1 is arranged to the central bottom part of a tank 2 and the periphery thereof is surrounded by a cylinder 5 opened at both upper and lower ends thereof. When the impeller 1 is rotated by a motor 6 in such a state that a liquid level is high, the stirring stream of a chemical solution generated by the movement of the impeller 1 is divided from the circumferential chemical solution by the cylinder 5 and the chemical solution is not rotated as a whole because the rotary motion possessed by the chemical solution is not transmitted to the circumference. Therefore, the surface of the chemical solution becomes smooth and the variation in the surface of the liquid is not generated. When the liquid level is low, the build-up of the chemical solution is partially generated but the liquid is brought to a sufficiently smooth state as a whole.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stirring device for stirring a solvent, a solution, etc.

[Conventional technology]

As shown in Figure 5, the stirring device for mixing the solvent and solution, or two liquids, rotates an impeller (1) installed at the center bottom of the tank using a motor or other necessary means to mix the chemical solution in the tank (2). (3
) is being stirred.

However, when the impeller (1) is rotated, the entire chemical solution rotates, and the liquid level of the chemical liquid (3) becomes a paraboloid as shown in the figure, with the central liquid level approaching the impeller (1) by 1 m.

If the central liquid level approaches significantly, a vortex flow along the rotation axis of the impeller (1) will occur, causing cavitation.

If this cavitation occurs, there will be problems such as damage to the agitator and reduction in agitation efficiency.In addition, if the liquid level fluctuates and a fixed amount of chemical solution is being discharged from the tank (2), the discharge amount will fluctuate greatly. .

In order to solve this problem, the installation position of the impeller is made eccentric or a eddy current prevention plate (4) is installed on the inner surface of the tank, but it cannot be said that it is sufficiently effective. However, there was a problem in that the larger the tank, the higher the cost.

[Problem that the invention seeks to solve]

In view of the above-mentioned circumstances, the present invention aims to provide a stirring device that has a simple structure and can effectively prevent liquid level fluctuations.

[Means for solving problems]

The present invention uses a cylindrical body to surround the impeller that generates the stirring flow, separates the stirring flow from the surrounding liquid, prevents the rotational motion of the stirring flow from being transmitted to the surroundings, and prevents the entire chemical solution from rotating. It was designed to do so.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

An impeller (1) is arranged at the center bottom of the tank (2), and a cylinder (5) with an open upper end and an open lower end surrounds the impeller (1).
surrounded by

When the isipeller (1) is rotated by the motor (6) as described above, if the liquid level is high, the agitation flow of the chemical solution caused by the impeller (1) will be as shown in Figure 2 (in Figure 2, The solid line indicates an upward water flow, and the dotted line indicates a downward water flow.] In other words, the stirring flow of the chemical solution caused by the movement of the impeller (1) is separated from the surrounding chemical solution by the cylinder, and the chemical solution is The rotational motion of the chemical is not transmitted to the surroundings and the entire chemical does not rotate.Therefore, the surface of the chemical is smooth and no liquid level fluctuation occurs.

Further, when the liquid level is low, the chemical liquid flows as shown in FIG. 3, and the chemical liquid bulges in some areas, but the overall state is sufficiently smooth.

Figure 4 shows an example of application of the present invention, in which a baffle plate (7) is provided above or below the cylinder (5) to actively direct the upward water flow (or downward water flow) (-horizontal direction). The current is changed to improve the stirring effect.

In addition, in the present invention, the impeller may be installed not in the center of the tank but at an offset position, and the impeller may be surrounded by a cylindrical body having a shape other than a cylinder (1° [Effect of the invention]) As described above, according to the present invention, liquid level fluctuations can be effectively prevented with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams showing the flow of chemical liquid, FIG. 4 is a partial diagram of another embodiment of the present invention, and FIG. 5 is a conventional diagram. It is an explanatory view of a stirring device. (1) is an impeller, (2) is a tank, (3) is a chemical solution, (
4) is a prevention plate, (5) is a cylinder, (6) is a motor, (7)
indicates a baffle plate. Figure 1 Figure 3 @ Figure 4 Figure 2 @ Figure 5

Claims (1)

[Claims] 1) A stirring device characterized in that an impeller that generates a stirring flow is surrounded by a cylindrical body.