JPH07786A - Impeller - Google Patents

Abstract

PURPOSE:To shorten the liq. agitating time and to sufficiently disperse a liq. mixture by forming plural holes in a flat vane for agitating the liq. in an agitated tank almost over the whole region. CONSTITUTION:A liq. A filled in an agitated tank 2 is agitated by an impeller 1 almost over the whole region. The impeller 1 has a supporting shaft 11 connected to an electric motor 3 side and a couple of left and right flat vanes 12 projecting sideways from the shaft 11, and many holes 13 of specified diameter are formed in the vane 12 at regular intervals. Consequently, the liq. is passed through the hole and spirally separated from the hole, and hence the liq. mixture is sufficiently dispersed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stirring blade for stirring a liquid.

[0002]

2. Description of the Related Art Conventionally, when mixing and stirring liquids, for example, when the stirring time is emphasized or when the viscosity of the liquid is high, the stirring blades used are anchor-shaped anchor blades,
There is a spiral ribbon screw.

[0003]

By the way, according to such an anchor blade or ribbon screw, there is a problem that the mixing time of the liquid is not so problematic, but the dispersibility of the mixed liquid is not good.

Therefore, an object of the present invention is to provide a stirring blade capable of solving the above problems.

[0005]

In order to solve the above-mentioned problems, the stirring blade of the present invention comprises a plurality of flat blade blades capable of stirring almost all of the liquid filled in the stirring tank. A hole is formed.

[0006]

According to the above construction, since the shape of the blade of the stirring blade is flat so that the liquid can be mixed over almost the entire area of the stirring tank, the stirring time of the liquid is shortened and the blade is also reduced. Since a large number of holes are formed over almost the entire surface of the blade, when the liquid passes through the holes of the vane, it vortexes away from its inner peripheral surface, so the dispersibility of the mixed liquid is also good. Become.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 is a stirring blade for mixing and stirring liquids, which is arranged in a stirring tank 2 having a bowl-shaped bottom and is connected to an electric motor 3 to rotate.

The stirring blade 1 is shaped so as to stir the liquid A filled in the stirring tank 2 over almost the entire area. That is, the stirring blade 1 includes a support shaft body 11 connected to the electric motor 3 side, and a pair of left and right flat plate-shaped blade plates 1 attached so as to project on both sides of the support shaft body 11.
2 and each of these vanes 12 has a large number of holes 13 having a predetermined diameter (for example, about 1/100 to 1/10 of the inner diameter of the stirring tank 2) formed at predetermined intervals. Is. For example, punching metal or the like is used as a constituent material of each blade 12.

The lower portion of each vane 12 has a stirring tank 2
A skirt portion 12a having, for example, an arc shape is formed so as to follow the shape of the inner bottom surface 2a, and a cutout portion 12b is provided in a portion near the support shaft body 11. The skirt portion 12a has no hole 13 formed therein.

Therefore, when the liquid is mixed by the above-mentioned stirring blade 1, as shown in FIG. 2, when the liquid passes through a large number of holes 13 formed in each blade 12, its inner peripheral surface Since the liquid is separated into the spiral V, the dispersibility of the mixed liquid becomes good. That is, since the blade 12 moves in the direction perpendicular to the liquid (see FIG. 2), the vortex generated when passing through the hole 13 promotes microscopic mixing, and the blade 12 is almost Since the liquid has a shape corresponding to almost the entire area of the stirring tank 2, efficient mixing and stirring is performed over the entire stirring tank 2. In the case of the ribbon screw, the blade crosses the liquid obliquely, which is inferior in that the liquid is dispersed as compared with the case of moving in a direction perpendicular to the liquid. Also, the anchor wing is
Although the stirring blade 1 is the same as the stirring blade 1 in that it moves in a direction perpendicular to the liquid, the length of contact with the liquid in the stirring blade 1 of the present embodiment (inner circumferential distance of hole portion × number of holes) is Since the contact length with the liquid in the anchor blade, that is, the outer peripheral distance is longer, the dispersibility is improved. Therefore, the hole 13
The better the number of.

In the case of such a flat blade 12, the power may increase. For example, for the anchor blade and the stirring blade in this embodiment, the stirring specific power (PV; unit liquid) The results of comparing the relationship between the stirring power per amount; KW / m ³ ) and the stirring time (θ; sec) are shown below.
It looks like the graph in FIG.

As can be seen from this graph, the stirring blade (shown by the solid line) in this embodiment is capable of mixing the liquid with lower power and in a shorter time than the anchor blade (shown by the broken line). You can

By the way, as shown in FIG. 4, baffle plates 21 having a predetermined projecting length may be arranged on the inner surface of the agitation tank 2 in the above-described embodiment, for example, every 90 degrees in four directions. In the above embodiment, the skirt 12a, which is the lower part of the blade 12, is not provided with a hole, but as shown in FIG. 5, for example, the hole 13 may be formed up to the skirt 12a. 6, the edge 12c at the bottom of the vane 12
May be along the inner wall surface 2a of the stirring tank 2. That is, it is not necessary to provide the cutout portion 12b as in the above embodiment.

Further, in the above embodiment, the vane is 1
Although a pair is provided at the 80-degree symmetrical position, it is not limited to such an arrangement and the number of sheets.
It is also possible to provide one sheet.

[0015]

As described above, according to the configuration of the present invention, the shape of the blade of the stirring blade is made flat so that the liquid in the stirring tank can be mixed over almost the entire area, and almost the entire surface of the blade is mixed. Since a large number of holes are formed, when mixing the liquid, the stirring time can be shortened, and when the liquid passes through the holes of the vane, it is spirally separated from its inner peripheral surface, The dispersibility of the mixed liquid also becomes good.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view of a stirring tank in which stirring blades are arranged in an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an essential part for explaining the action of the stirring blade in the embodiment.

FIG. 3 is a graph showing the relationship between the stirring time and the stirring specific power of the stirring blade and the anchor blade of the same embodiment.

FIG. 4 is a schematic cross-sectional view showing a modified example of the stirring tank in the above embodiment.

FIG. 5 is a side view of a stirring blade according to another embodiment of the present invention.

FIG. 6 is a side view of a stirring blade according to another embodiment of the present invention.

[Explanation of symbols]

 1 Stirring Blade 2 Stirring Tank 11 Support Shaft 12 Vane 13 Hole

Claims (1)

[Claims] 1. A stirring blade, wherein a plurality of holes are formed in a flat blade that can stir the liquid filled in the stirring tank over almost the entire area.