JPH02273531A - Agitating device - Google Patents

Abstract

PURPOSE:To form a strong circulating flow formed across the upper section and the lower section of an agitating blade and mix the upper and lower portions efficiently by constituting the agitating blade in a manner that the fluid generates regular and reverse thrust forces in the agitating shaft direction by means of rotation of agitating blade. CONSTITUTION:Fluid in a tank 2 is agitated and mixed by means of rotation of an agitating blade 4. Said agitating blade 4 is constituted of a plurality of agitating blade pieces 42, and said agitating blade pieces 42 are constituted that the regular and reverse thrust forces of the fluid in the direction of an agitating shaft 5 are generated by means of the rotation of agitating blade pieces 42. As a result, a strong circulating flow formed across the upper and lower sections of agitating blade can be generated to increase mixing properties of the upper and lower sections.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stirring blade, and particularly to a stirring blade suitable for a fluid stirring device.

[Conventional technology]

Stirring devices that stir fluids such as liquids, powders, or a mixture of both in the tank achieve uniform mixing and improved heat transfer.

Although it is used for hot operation purposes such as preventing coalescence or sedimentation of particles, homogeneous mixing is a common objective for each operation, and a stirring device with high mixing performance and short mixing time is desired.

Various types of rotary stirring blades have been proposed and put into practical use in order to improve mixing performance. Conventional stirring blades are classified into two types. That is, the first is a rotary stirring 1 represented by a fan turbine.
The second method is to achieve mixing in the tank by propeller-type stirring gi In the first method of mixing, as shown in Fig. 8, the main circulation flow in the tank is connected to the stirring blade 4 and the upper part A as a boundary.
The flow was divided into the B flow in the F section, and the mixing of the upper liquid and the upper liquid occurred due to the turbulence of the axial flow at the boundary between the A and B flows (only 5 turbulence occurred, and the upper and lower mixing properties were not sufficient).

The second method, as shown in Figure 9, aims at mixing by circulating flow in the tank due to the discharge flow of the stirring blade. In this method, a circulating flow due to the discharge occurs directly under the stirring blade, and the circulating flow is attenuated by diffusion during the course of the stirring, weakening the circulation force of the entire 9° stirring tank, resulting in insufficient mixing between the upper and lower sides.

[Problem to be solved by the invention]

Conventional # above! 1. This technique had the disadvantage that sufficient mixing could not be achieved because no consideration was given to the mixing properties between the upper and lower parts of the stirring blades. .

[1] The purpose of the present invention is to create a strong circulating flow across the upper and lower wells of the stirring blade. fJ1. We provide a highly acoustic stirring device (Z).

[Means to solve the problem]

”Jul 1] To achieve the goal 6. ``E, Stirring blade a Rotation of the stirring blade 1:, 9 circles are fluids... Stirring 1 Short sleeve order (A 3 Structure that generates force and reverse thrust iX:, It is constructed as follows).

[For production]

What constitutes a stirring blade? Ill of w number! Since the M'M piece moves toward the rotating surface at the inner and outer sides in the radial direction and has angles in opposite directions, the rotation produces thrust forces in opposite directions to the it body at the inner and outer sides. 1. In other words, the inside part → upper part −→ to the fluid in the tank
A large circulation can be generated from the outer part-1, the hip part to the inner part.4. [Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 4. Stirring MfiF1 includes stirring blade 2 and bearing mounting H3i.
The stirrer 14 is supported by the stirrer 14 and rotated by a motor 61 via the stirrer shaft 5. Stirring R4 is seat 41 +':
Consisting of a plurality of stirring blades 42, each stirring blade 4
215 The inner part and the outer part in the radial direction are attached to the seat 41e at opposite angles pt (with L), with the rotating surfaces being one pair.

The stirring blade 42 shown in Figure 2 consists essentially of a single member, the inner and outer parts of which are twisted at opposite angles with respect to the same rotation rIiii. or fourth
In the configuration shown in the figure, as the stirring blades rotate, each stirring blade generates a forward thrust that pushes the fluid at its radially inner portion, and a reverse thrust that pushes the fluid downward at its outer portion.

Figures 5 and 6 show other embodiments of the stirring blade, in which the IJ is constructed by directly connecting two members 4251 and 421) having mutually opposite thrust forces. In FIG. 6, both members 42a and 42b are in contact with each other through a member 42cf perpendicular to the plane of rotation. ′: Constructed.

FIG. 7 is a diagram showing the circulation of fluid in the stirring tank according to the invention. The radially inner part pushes up the 7 outer part.”
Because a thrust force is generated to push down Chi, the fluid flows inside →
Upper part - Outer part - Lower part - Inner @ part tablespoon f'!
, giving rise to circulation.

Note that G in Fig. 1 is not shown, but in addition to having a fluid supply nozzle and a discharge nozzle, it also has a -211-get for heating or cooling as necessary, and an internal heat transfer tube can be installed. 11). Further, the stirring blades of the present invention may be provided in multiple stages, with 15 blades in the direction of the stirring axis.

Furthermore, the stirring blade of the present invention can be used in addition to the known techniques as well as the PIl striking blade 95 and draft tube. You are free to use it with the bubble trap prevention device 8°r internal bubble device, etc.

[Effects of the Invention] The present invention is constructed and produced as described in Section 1.1 and 6. Therefore, the following effects are achieved. , the first jfj method of the prior art does not have the disadvantage that the circulating flow is separated from the stirring blade direction and the downward direction because it generates a large (J6 term). For example, the circulation flow directly under the stirring blade on the inside in the half direction can be expressed as /l・.

Even if the second method of the prior art has a new C circulation of 4"fQ on the outside in the radial direction, the second method of the prior art does not have the disadvantage of having a weak overall circulation flow. The invention is based on the 4 strong shields and 1 action of the 6-diru.
攬社舅” - Mixing of the two sides and the bottom is promoted and the mixing time is 1j.
It has the effect of being able to reduce

[Brief explanation of drawings]

Figure 1 or Figure 3 1i books? Figure 1 is a side sectional view of the stirring device, Figure 2 is a plan view of the stirring blade, and Figure 1!!!3 is 1-1 in Figure 2. 4 is a sectional view taken along the line l-1 in FIG. 2, and FIG. 5 is a sectional view taken along line 1-1 in FIG. Explanatory diagram showing the route, Figures 8 and 9
Each figure is a side sectional view of a conventional stirring device. ! ... Stirring device, 2... Stirring tank, 4.
...Stirring blade, 42... Stirring blade agent Patent attorney Katsutoshi Ogawa

Claims (1)

[Scope of Claims] 1. In a stirring device that stirs and mixes fluid in a tank by rotating a stirring blade, the stirring blade is composed of a plurality of stirring blades, and the stirring blades rotate the fluid into a stirring shaft. A stirring device characterized in that it is configured to generate a forward thrust and a reverse thrust in the direction. 2. The stirring device according to claim 1, wherein the individual stirring blades of the stirring blade are configured to generate opposite thrusts on the inside and outside in the radial direction. 3. The stirring device according to claim 2, wherein the individual stirring blades of the stirring blade have opposite angles on the inside and outside in the radial direction with respect to the rotating surface. 4. The agitation device according to claim 3, wherein each of the agitation blades is substantially composed of a single member, and is configured to generate opposite thrusts depending on its twisted shape. 5. Claim 3, wherein the individual stirring blades are substantially composed of a plurality of members, and at least two of the members are configured to have opposite angles with respect to the rotating surface. Stirring device as described in section.