JP4380889B2 - Reciprocating stirring blade - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reciprocating stirring blade suitable for stirring liquids in various industries such as medicine, cosmetics, food, and biotechnology.
[0002]
[Prior art]
As a conventional agitating blade for reciprocal reversal, a stirring blade c in which four rectangular plate-like blade bodies b project radially from the outer periphery of the boss a as shown in FIG. 10, or from the outer periphery of the boss d as shown in FIG. There is known a stirring blade f in which four wings e having a triangular cross section are radially provided.
[0003]
[Problems to be solved by the invention]
When the former former agitating blade c is fixed to the rotating shaft g as shown in FIG. 12 and suspended in the liquid in the agitating tank h to rotate the rotating shaft g back and forth, the blade body b is also moved to the back as shown in FIG. A vortex flow is generated, and a large shearing force is generated by the vortex flow, and flow patterns in opposite directions are formed in the liquid in the stirring tank h as shown in FIG. 12, and the flow in the tank is divided into two. Further, when the latter latter stirring blade f is fixed to the rotating shaft g as shown in FIG. 14 and suspended in the liquid in the stirring vessel h and the rotating shaft g is reciprocally rotated, the blade body e of FIG. A vortex flow is generated on the back surface, and a large shearing force is generated by the vortex flow, and a circulating flow short-passing the liquid in the stirring tank h and a flow pattern in the opposite directions are formed as shown in FIG. There was a problem that the blades could only be stirred in the tank and the stirring efficiency was low.
[0004]
An object of the present invention is to solve these problems and to provide an agitating blade for reciprocating reversal with good agitation efficiency so as to create an effective axial direction with low shearing force in agitation and to obtain a vertical circulation flow in a tank. And
[0005]
[Means for Solving the Problems]
In order to achieve the above object, in the present invention, in the cross section, the left and right shapes of the center line are symmetrical, and the upper surface is formed in a convex curved shape upward, and the lower surface is horizontal or It consists of a wing body that is formed in a concave curved shape toward the upper side, and the wing body is provided with auxiliary wings having a symmetrical cross-sectional shape at intervals on the left and right ends of the lower surface. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a reciprocating stirring blade according to the present invention will be described with reference to FIGS.
[0007]
FIG. 1 is a perspective view of a stirring device incorporating a reciprocating stirring blade 1 according to the present invention. The reciprocating stirring blade 1 can be reciprocated in the direction of arrow R1 or arrow R2 by a driving device (not shown). Is suspended in the stirring tank 3.
[0008]
4 shows the liquid level in the stirring tank.
[0009]
The reciprocating stirring blade 1 has a plurality of blade bodies 2 radially fixed to the boss 1b at the lower end of the rotating shaft 1a.
[0010]
FIG. 2 shows a cross-sectional view of the wing body 2. The wing body 2 has a cross section formed into a symmetrical airfoil shape in which the upper surface 2 a is convex upward and the lower surface 2 b is horizontal.
[0011]
FIG. 3 shows a plan view of the wing body 2, and the wing body 2 is formed in a substantially spire shape with a width narrowing from the root portion toward the tip portion in the plane.
[0012]
Next, the operation and effect of the reciprocating stirring blade 1 of this embodiment will be described.
[0013]
The reciprocating stirring blades 1 in the stirring tank 3 are rotated alternately while switching at a predetermined interval in the direction of rotation R1 or R2.
[0014]
Since the cross-sectional shape of the wing body 2 is convex upward, as shown in FIGS. 4 (a) and 4 (b), it is possible to prevent separation at the trailing edge of the wing in both directions during reciprocating reversal operation, and A lift F is generated by the pressure difference at, creating a downward axial flow.
[0015]
In other words, the reciprocating reversing stirring blade 1 was prevented from peeling at the trailing edge of the blade as described above, and a circulating flow indicated by the arrow A in FIG.
[0016]
In the present embodiment, the planar shape of the wing body 2 is a substantially spire shape whose width decreases from the root portion toward the tip portion. However, as shown in FIG. The plane shape of the wing body 2 may be substantially fan-shaped with the width increasing from the root portion toward the tip portion as shown in FIG. 6.
[0017]
Further, in the present embodiment, the cross-sectional shape of the wing body 2 is a symmetrical wing shape in which the upper surface is convex upward and the lower surface is horizontal. However, as shown in FIG. It may be a symmetric thin plate-like wing body 2 ′ having a convex surface and a bottom surface concave upward, or, as shown in FIG. 8, the top surface is convex upward and the bottom surface is concave upward. A wing body 2 ″ having a symmetric airfoil that is thicker than the wing body 2 ′ may be used. Alternatively, as shown in FIG. 9, there is a gap between the left and right ends of the lower surface of the wing body 2 ″. Alternatively, a double wing type wing body 2 "'may be provided by attaching auxiliary blades 2c having a symmetrical cross-sectional shape via a stay 2d.
[0018]
【The invention's effect】
As described above, according to the present invention, in the stirring blade for reciprocal reversal of the stirring device that performs stirring while performing reciprocal reversal, an effective axial flow is created with a low shear force, and a good vertical circulation flow is obtained in the tank. Has the effect.
[Brief description of the drawings]
FIG. 1 is a perspective view of a stirring apparatus incorporating a reciprocating stirring blade of the present invention.
FIG. 2 is a cross-sectional view of a blade body of the reciprocating reversing stirring blade.
FIG. 3 is a plan view of a blade body of the reciprocating stirring blade.
FIG. 4 is an explanatory view showing the operation of the wing body.
[Figure 5]
[Fig. 6]
[Fig. 7]
[Fig. 8]
FIG. 9 is an explanatory view showing another embodiment of the wing body.
FIG. 10 is a perspective view of an example of a conventional reciprocating stirring blade.
FIG. 11 is a perspective view of another example of a conventional reciprocating stirring blade.
12 is an explanatory view showing an operating state of the example of the conventional reciprocating stirring blade shown in FIG.
FIG. 13 is an explanatory view showing an operating state of a blade body as an example of a reciprocating stirring blade.
14 is an explanatory view showing an operating state of another example of the conventional reciprocating stirring blade shown in FIG.
FIG. 15 is an explanatory view showing an operating state of a blade body of another example of the above-described reciprocating reversing stirring blade.
[Explanation of symbols]
1 Reciprocating stirring blade 2, 2 ′, 2 ″, 2 ″ ″ Wing body 2c Auxiliary blade

Claims (1)

In the cross section, the left and right shapes of the center line are symmetrical, and the upper surface is formed in a convex curved shape upward, and the lower surface is formed in a curved shape that is horizontal or concave upward. and which Ri Na than wing body, the wing body reciprocating reversing stirring blade, characterized in that annexed aileron cross-sectional shape symmetrical with intervals in the right and left end portions of the lower surface.

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