JP2001347151A - Reciprocating/reversing agitation blade - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reciprocating/reversing agitation blade, which is used in an agitation device for agitating the contents while being reciprocated and reversed and by which an effective axial direction current is produced with low shearing force to obtain an excellent vertical circulating current. SOLUTION: A blade body 2 of this reciprocating/reversing agitation blade 1 has a shape symmetrical to the centerline of the cross-section. The upper surface 2a of the body 2 is formed to have a curved shape projecting upward and the lower surface 2b is formed to have a flat shape or a curved shape recessed upward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reciprocating agitating blade suitable for agitating liquids in various industries such as medicine, cosmetics, food and biotechnology.

[0002]

2. Description of the Related Art FIG.
0, four rectangular plate-shaped wings b from the outer periphery of the boss a
Impellers protruding radially, or boss d as shown in FIG.
There is known a stirring blade f in which four columnar blades e having a triangular cross section project radially from the outer periphery of the blade.

[0003]

SUMMARY OF THE INVENTION The former former stirring blade c
Is fixed to the rotation axis g as shown in FIG. 12 and dripped into the liquid in the stirring tank h to reciprocately rotate the rotation axis g. As shown in FIG. A large shear force is generated, and the liquid in the stirring tank h is formed with flow patterns in the upper and lower directions opposite to each other as shown in FIG. 12, and the flow in the tank is divided into two. Further, when the latter conventional stirring blade f is fixed to the rotation shaft g as shown in FIG. 14 and hangs down in the liquid in the stirring tank h to reciprocately rotate the rotation shaft g, as shown in FIG. A vortex is generated on the back surface, and the vortex generates a large shearing force and forms a circulating flow that short-passes the liquid in the stirring tank h and upper and lower flow patterns opposite to each other as shown in FIG. The wings can only perform stirring in a scraping shape in the tank, and there is a problem that the stirring efficiency is low.

The present invention solves these problems, and provides a reciprocating reversing stirring blade with high stirring efficiency that produces an effective axial direction with low shearing force in stirring to obtain a vertical circulating flow in a tank. The purpose is to:

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has a cross section in which the shape of the center line on the left and right is symmetrical and the upper surface is formed in a curved shape convex upward. And a wing body whose lower surface is formed in a horizontal or upward concave shape.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a reciprocating reversing stirring blade of the present invention will be described with reference to FIGS.

FIG. 1 is a perspective view of a stirring device incorporating the reciprocating reversing stirring blade 1 of the present invention. The reciprocating reversing stirring blade 1 is driven by an unillustrated driving device by an arrow R1 or an arrow R2.
Is vertically installed in the stirring tank 3 so as to be reciprocally reversible in the direction of.

Reference numeral 4 denotes a liquid level in the stirring tank.

The reciprocating reversing stirring blade 1 has a plurality of blades 2 fixed radially to a boss 1b at the lower end of a rotating shaft 1a.

FIG. 2 shows a cross-sectional view of the wing body 2.
Is formed such that the upper surface 2a is convex upward and the lower surface 2b is a horizontal symmetrical airfoil.

FIG. 3 is a plan view of the wing body 2 and shows the wing body 2.
Is formed in a substantially spire shape in which the width decreases from the root to the tip in a plane.

Next, the operation and effect of the reciprocating reversing stirring blade 1 of the present embodiment will be described.

The reciprocating reversal stirring blades 1 in the stirring tank 3 are alternately rotated in the direction of rotation R1 or R2 while switching at predetermined intervals.

Since the cross-sectional shape of the wing body 2 is curved upwardly convex, as shown in FIGS. 4A and 4B, separation at the wing trailing edge in both directions during reciprocating reversal operation is prevented, and The lift F is generated by the pressure difference between the upper and lower surfaces of the blades, thereby creating a downward axial flow.

That is, as described above, the reciprocating reversing stirring blade 1 is prevented from being separated at the trailing edge of the blade and generates a circulating flow indicated by an arrow A in FIG. did it.

In the present embodiment, the plane shape of the wing body 2 is substantially a spire with a width decreasing from the root to the tip, but as shown in FIG. From the root to the tip to make it a substantially rectangular shape with a constant width,
Alternatively, as shown in FIG. 6, the plane shape of the wing body 2 may be a substantially fan-like shape whose width increases from the root to the tip.

Further, in the present embodiment, the wing body 2 has a symmetrical wing shape in which the upper surface is convex upward and the lower surface is horizontal, as shown in FIG. A symmetrical thin plate-shaped wing body 2 ′ that is convex upward and has a lower surface that is concave upward may be used, or, as shown in FIG. 8, the upper surface is convex upward and the lower surface is upward. A wing body 2 having a bilaterally symmetrical wing shape thicker than the concave wing body 2 ′
Alternatively, as shown in FIG. 9, auxiliary wings 2c having a bilaterally symmetrical cross section may be provided via stays 2d at left and right ends of the lower surface of the wing body 2 '' as shown in FIG. do it,
It may be a wing body 2 "" of a double wing system.

[0018]

As described above, according to the present invention, in a reciprocating reversal stirring blade of a stirrer that performs stirring while reciprocating reversal, an effective axial flow is produced with a low shear force, and a good This has the effect of obtaining a vertically circulating flow.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stirring device incorporating a reciprocating stirring blade according to the present invention.

FIG. 2 is a cross-sectional view of a blade body of the reciprocating reversal stirring blade.

FIG. 3 is a plan view of a blade body of the reciprocating reversal stirring blade.

FIG. 4 is an explanatory view showing the operation of the wing.

FIG. 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 reversal stirring blade.

FIG. 11 is a perspective view of another example of a conventional reciprocating reversal stirring blade.

FIG. 12 is an explanatory view showing an operation state of an example of the conventional reciprocating reversal stirring blade shown in FIG.

FIG. 13 is an explanatory view showing an operation state of an airfoil as an example of the reciprocating reversing stirring blade.

FIG. 14 is an explanatory diagram showing an operation state of another example of the conventional reciprocating reversing stirring blade shown in FIG.

FIG. 15 is an explanatory diagram showing an operating state of another example of the blade body for the reciprocating reversing stirring blade.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Reciprocating reversing stirring blade 2, 2 ', 2 ", 2" "Wing body 2c Auxiliary blade

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[Procedure amendment]

[Submission date] June 28, 2000 (2006.2.
8)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 3

FIG. 4

FIG. 5

FIG. 6

FIG. 7

FIG. 8

FIG. 9

FIG. 10

FIG. 11

FIG. 13

FIG.

FIG. 14

FIG.

Claims (5)

[Claims] 1. In a cross section, the shape of the center line on the left and right is symmetrical, and the upper surface is formed in a curved shape convex upward and the lower surface is horizontal or concave upward. A stirring blade for reciprocating reversal, comprising a blade body formed in a curved shape. 2. The reciprocating reversing stirring blade according to claim 1, wherein the blade body is formed in a substantially rectangular shape in a plane. 3. The reciprocating reversing stirring blade according to claim 1, wherein the blade body is formed in a substantially spire shape having a width which becomes narrower from a root to a tip in a plane. 4. The agitating blade for reversing reversal according to claim 1, wherein the blade body is formed in a substantially fan-like shape whose width increases from a root to a tip in a plane. 5. The wing body according to claim 1, wherein auxiliary wings having a symmetrical cross-sectional shape are provided at left and right end portions of the lower surface with a space therebetween. Stirrer blade for reciprocating reversal.