JPH01104331A - Ribbon type agitator - Google Patents

Abstract

PURPOSE:To raise agitating effects by producing complicated circulating flows, by providing a continuously extending agitating vane, which is helically twisted, in association with an agitating vane comprising separate helical segments twisted in the opposite direction, rotating both vanes in the same direction at the same rotational speed. CONSTITUTION:An agitating vane 2 is twisted in such a direction that, when it rotates, it causes upward flows of fluids in an agitation vessel 1, whereas an agitating vane 3 acts so as to cause downward flows of fluids in the vessel 1, wherein the vane 2, which is a continuous vane, forms a large continuous upward flow of fluids, while the agitating vane 3 produces a plurality of small downward flows since said vane comprises separate segments. In this manner, a large upward circulating flow and a plurality of small downward circulating flows coexist, causing complicated flows, hence leading to good agitating effects.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a ribbon type stirring device equipped with a plurality of stirring blades.

[Conventional technology]

The two stirring blades of the conventional double ribbon type stirring device each have one continuous spiral blade. Therefore, both of the blades must be twisted either to the right or to the left, and the stirring effect of the stirring blades is limited to either upward or downward circulation.

[Problem that the invention seeks to solve]

In the conventional double ribbon type stirring device mentioned above, there are two stirring blades.
Since each blade is one continuous blade, both of the blades need to be screwed to the right or left. Therefore, the flow of fluid in the stirring tank is limited to either an upward or downward circulating flow, and the stirring effect tends to be insufficient.

The present invention aims to solve this drawback, and improves the stirring effect by adding a circulating flow in the opposite direction to the large circulating flow, either upward or downward.

[Means for solving problems]

In the present invention, one of the stirring blades is provided with a continuous stirring blade twisted in a spiral shape, and the other stirring blade is spirally twisted in the opposite direction to the above-mentioned one stirring blade. Since the stirring blades are twisted in opposite directions, the two blades come into contact and intersect, and at this intersection, the other stirring blade is cut out to form an intermittent blade.

Both types of stirring blades configured as described above are configured to rotate in the same direction and at the same rotation speed.

Note that the number of continuous stirring blades on one side may be one or more, and the number of intermittent stirring blades on the other side may be one or more. In this case, at the intersection of each local stirring blade and each stirring blade, the other intermittent stirring blade is cut out.

[Effect]

In the present invention, one of the stirring blades of the stirring device is a continuous spiral blade, and this blade provides a large upward or downward circulating flow. At the same time, the other intermittent vane is twisted spirally in the opposite direction to the one continuous vane, so that a plurality of small circulating flows are obtained in the opposite direction to the thick circulating flow caused by the continuous vane. Therefore, the fluid is given a large circulation flow in one direction and a small circulation flow in the opposite direction, giving a stirring effect.

〔Example〕

An embodiment of the present invention will be described with reference to FIG.

The stirring blade 2 of the double ribbon type stirring device installed in the stirring tank 1 is one continuous spiral blade, and the other stirring blade 3 is an interrupted spiral blade. The stirring blades 2 and 3 are twisted in opposite directions. For example, if the stirring blade 2 has a right-hand thread, the stirring blade 3 has a left-hand thread. A rotating shaft 6 is provided at the upper center of the stirring tank 1, and connecting shafts 7.about.7' extending horizontally in opposite directions are attached to the lower end of the rotating shaft 6. Stirring blade shafts 8.8' extending downward along the inner wall of the stirring tank 1 are attached to the ends of the connecting shafts 7, 7', and stirring blades 2.8' are attached to the blade shafts 8, 8', respectively, as shown in the figure. 3 is installed. As mentioned above, stirring blade 2.
3, since the stirring blades 2 and 3 are twisted in opposite directions, the stirring blades 2 and 3 come into contact and cross each other every A rotation. Therefore, if the stirring blades 2 and 3 are kept in contact with each other, the flow of the internal fluid will be obstructed and the fluid will stagnate. 5, the stirring blade 3 is cut off, and the stirring blade 3 is cut intermittently. Since the present embodiment is constructed as described above, if the stirring blade 2 is twisted and rotated so as to raise the internal fluid of the stirring tank 1, the stirring blade 3 will act to lower the internal fluid. do. At this time, since the stirring blade 2 is a continuous blade, the internal fluid is given one continuous large upward flow, and the stirring blade 3 is a plurality of intermittent blades, so this causes The internal fluid is given a plurality of small downward flows. In this way, the large upward circulating flow and the plurality of small downward circulating flows converge, creating a complex flow and providing a good stirring effect.

In addition, by rotating the stirring blade 2.3 in the opposite direction to the above,
It is also possible to generate a large downward circulating flow in the internal fluid with continuous stirring blades 2, and to give a small upward circulating flow with intermittent stirring blades 3, thereby obtaining a good stirring effect.

In this embodiment, when a large upward flow is generated by the stirring blade 2, there is a phenomenon in which the internal fluid bulges at the top of the blade 2 due to stirring, and this is particularly noticeable in high-viscosity fluids.

When a severe stirring effect is required, this swelling phenomenon may cause a problem of fluid retention in the raised portion. Therefore, by raising the top of the stirring blade 3, which gives a downward flow to the internal fluid, by an appropriate distance 4 higher than the top of the stirring blade 2, which gives an upward flow to the internal fluid, as shown in the figure, the swollen internal fluid is lowered. It is also possible to perform more effective stirring by eliminating the stagnation/stagnation part.

In the above embodiment, one continuous stirring blade and one discontinuous stirring blade are provided, but in the present invention, a plurality of stirring blades may be provided.

[Effects of the Invention] According to the present invention, a large upward or downward circulating flow and a plurality of small downward or upward circulating flows can be obtained, and these circulating flows can converge to obtain a good stirring effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the present invention. 1... Stirring tank, 2... Stirring blade, 3... Stirring blade, 6... Rotating shaft, 8, 8'... Stirring blade shaft. Agent Patent Attorney Akira Sakama

Claims (1)

[Claims] one continuous stirring blade twisted in a spiral, and the other stirring blade twisted spirally in the opposite direction to the one stirring blade and intermittent with a cutout at the intersection with the one stirring blade. A ribbon-type stirring device, characterized in that both of the stirring blades rotate in the same direction and at the same rotation speed.