JPH0515756A - Powder/liquid mixing/dispersion device with preliminarily stirring blade - Google Patents

Abstract

PURPOSE:To disperse powder in advance using a stirring blade to increase the ability to disperse of a dispersion machine and shorten the processing operation time in the high powder concentration mode by providing the stirring blade consisting of a bar-like member on an extension shaft extended on the powder suction side of a rotor. CONSTITUTION:An extended shaft 2a extended on a suction chamber 21 side is integrally formed on a rotary shaft 2 and stirring blades 3 are arranged at an equal interval on the circumference of the extended shaft 2a. The stirring blade 3 consists of the first square bar 3a on a suction chamber 21 side extending toward the outer part of a radial direction from the extension shaft 2a, the second square bar 3b which is connected to the end of the first square bar 3a and runs obliquely to a roller 10 side in an opposite direction to the rotating direction of the rotary shaft 2 on a plane in parallel with the axial line and the third square bar 3 which is connected to the second square bar 36, then extends to the inner part of the radial direction and connects continuously to the extension shaft 2a. In addition, a barrel 20a which covers the external periphery of a rotary surface of the stirring blade 3 is formed on the casing 20 of the suction chamber. The stirring blade 3 breaks down a mass of wet powder in a mixture flow A3 to help disperse the powder and proceeds toward a generator G.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a powder-liquid mixing / dispersing machine for sucking powder and liquid by a negative pressure generated by the centrifugal action of a rotating body and mixing and dispersing them by the stirring force of the rotating body, and particularly to preliminary stirring. The present invention relates to a powder-liquid mixing and dispersing machine with blades.

[0002]

2. Description of the Related Art Conventionally, in this type of mixing and dispersing machine, as the concentration of the powder in the liquid increases, the dispersing ability of the rotating body decreases.

[0003]

As a means for preventing this, when the concentration is high, the liquid inlet and outlet are connected by a pipe and a tank to operate while circulating the liquid, and even after the powder is charged. The circulation operation is continued for a while until the powder is completely dispersed. Therefore, the operation time required for processing becomes long.

An object of the present invention is to provide a powder-liquid mixing / dispersing machine with a pre-stirring blade that shortens the operating time required for treatment at high concentration as much as possible.

[0005]

According to the present invention, a powder-liquid mixing / dispersing machine for sucking powder and liquid by a negative pressure generated by centrifugal action of a rotating body and mixing and dispersing by the stirring force of the rotating body. An agitation blade made of a rod-shaped member is provided on an extension shaft extending the shaft of the rotating body to the side for sucking powder.

The rotating body is the output shaft of the motor or
It is composed of a rotor fixed to a drive shaft connected to a motor by a coupling, a stator is fixed to a casing facing the rotor, a generator is formed by the rotor and the stator, and is placed between the rotor and the stator. It is preferable to form a shear gap and to form a stepped step and a toothed recess in the rotor and the stator, respectively.

Further, the stirring blade has a first rotor rod opposite to the rotor extending in the radial direction from the extension shaft, and a rotor rotor side in a plane continuous to the end portion of the first rotor rod and parallel to the axis. The second slanted to the rotor side in the direction opposite to the rotation direction of the extension shaft when viewed from the side
It is preferable that a plurality of rectangular rods are provided at equal intervals around the circumference, and a third rectangular rod that is continuous with the end of the second rectangular rod and extends inward in the radial direction and is continuous with the extension shaft.

Further, the agitating blades are oriented in a radial direction outward from the extension shaft, and a large number of pins are spirally erected from the opposite rotor side to the rotor side in the direction opposite to the rotation direction of the extension shaft when viewed from the opposite rotor side. It is preferable that

[0009]

In the powder-liquid mixing / dispersing machine with the preliminary stirring blade constructed as described above, the stirring blade made of a rod-shaped member is
The so-called cod in the mixed liquid is destroyed to promote dispersion, and pre-dispersion is performed to enhance the dispersion capacity of the disperser and shorten the processing operation time at high concentration. In addition, incomplete adhesion of the mixed liquid is prevented, and the stirring power is small.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a motor housing 1 of a motor (not shown) in which an output shaft 2 is arranged vertically is equipped with a dispersion chamber casing 10 having a liquid discharge port 14 and defining a dispersion chamber 11. The chamber 11 accommodates a rotor 12, which is a rotating body fixed to the end of the output shaft 2. The dispersion chamber housing 10 has a liquid suction port 22.
And a suction chamber casing 20 defining a suction chamber 21 is attached. A suction cover 30 having a powder suction port 31 is attached to the non-motor end of the suction chamber casing 20, and a powder hopper 33 is attached to the powder suction port 31 via a powder supply valve 32. Has been. And these members 1, 10, 20, 30, 32 and 33 are connected to each other by ferrule flanges h, h and clamp g, respectively, and therefore, the liquid discharge port 14 and the liquid suction port 22.
The valve 32 and the valve 32 can be freely set in directions of 360 °.

The dispersion chamber casing 10 includes a rotor 1
The stator 13 facing 2 is fixedly provided, and the generator G is constituted by both. The space between the rotor 12 and the stator 13 is disclosed in Japanese Patent Laid-Open No. 63-
As shown in Japanese Patent No. 49239, a shear gap Cr is formed, and liquid and powder sucked from the liquid suction port 22 and the powder suction port 31 are sheared and mixed by being sheared in the shear gap Cr, and discharged from the liquid discharge port 14. It is supposed to do. for that reason,
The rotor 12 and the stator 13 have stepped step portions Tr and Ts for efficiently performing dispersion, and tooth-shaped concave portions 1
2a and 13a are provided, respectively.

In the suction chamber casing 20, there are provided a cylindrical outer weir 23 and an inner weir 24, which rectify the liquid sucked from the liquid suction port 22, guide it to the opposite motor side, then reverse it and return it to the motor side. It is provided heavily. Also, the rotor 1
An orifice 25 is provided on the side facing 2 and the end of the orifice 25 is formed into a cylindrical portion 26 projecting into the suction chamber 21.

The rotary shaft 2 is integrally formed with an extension shaft 2a extending toward the suction chamber 21. The extension shaft 2a has a plurality of (four in the illustrated example) stirring blades 3 arranged around the circumference thereof. They are evenly distributed. The stirring blade 3 includes a first square bar 3a on the suction chamber 21 side that extends radially outward from the extension shaft 2a.
And the rotor 12 side in a direction continuous to the end of the first square rod 3a and viewed in the plane parallel to the axis from the suction chamber 21 side toward the rotor 12 side, that is, in the direction opposite to the rotation direction of the output shaft 2. A second square bar 3b that is inclined to the third side, and a third square bar 3b that is continuous with the end of the second square bar 3b and extends inward in the radial direction and is continuous with the extension shaft 2a.
It consists of a square bar 3c. In addition, the suction chamber casing 20 has a body portion 20a that covers the outer periphery of the rotating surface of the stirring blade 3.
Are formed. Then, as shown in FIG.
Is formed so that the inner diameter dimension thereof is indicated by reference numeral D.

Next, the operation will be described. The flow A of the liquid sucked by the negative pressure swirl flow section S, which will be described later, first flows into the outer weir 2
It is rectified on the outer periphery of 3 and becomes a flow A1 to the opposite motor side,
The inner weir 24 reverses the flow A2 to the motor side. Then, a swirling flow is generated by the centrifugal action of the rotor 12 and heads toward the powder suction port 31. As described above, a uniform swirl flow is generated by sucking the liquid in the rectified state, and the swirl flow sufficiently performs the mixing advance to reach the rotor 12. At this time, since the suction chamber 21 has a negative pressure, the powder is sucked from the orifice 25 and is replaced with a part of the liquid to become the mixed flow A3, which is directed to the stirring blade 3. This stirring blade 3 breaks up the so-called lumps of moist powder in the mixed flow A3 to promote dispersion and directs it to the generator G as a mixed flow A4. Further, since the square rods 3a to 3c are sufficiently in contact with the liquid, incomplete adhesion of the mixed liquid is prevented, and the stirring power is small. In the generator G, the mixed flow A4 is sheared when passing through the shear gap Cr, and the powder is completely dispersed and discharged from the liquid discharge port 14.
The negative pressure generated by the centrifugal action of the rotor 12 decreases with an increase in concentration if the number of rotations is the same, but the rate of decrease is stable and the powder is continuously supplied into the suction chamber 21 and is excessive. Supply is prevented. Further, the swirling flow section S is formed by the cylindrical section 26.
The inner diameter D of the swirling flow section S is limited by
It is almost the same as the outer diameter of. Therefore, the liquid does not enter the inside of the orifice 25. As a result, the portion of the orifice 25 is always kept in a dry state, and clogging due to wetting of the powder is prevented.

FIG. 2 shows another embodiment of the present invention, in which the stirring blade 5 is directed radially outward from the extension shaft 2a, and the suction chamber 2
This is an example in which a large number of pins 5a are provided upright in a spiral shape from the first side to the rotor 12 side in a clockwise direction when viewed from the suction chamber 21 side. In this embodiment, a large number of pins 5a arranged in a spiral shape restrict the incomplete retention of the mixed liquid by the feeding action to prevent clogging, and minimize the gap between the tip of the pin 5a and the body portion 20a. By doing so, the deposits on the wall surface of the suction chamber 21 can be removed.

[0017]

Since the present invention is constructed as described above, it is possible to improve the dispersion capacity of the disperser by pre-dispersing the stirring blades.

Further, the rod-shaped stirring blade can promote the dispersion while suppressing the loss of power.

As a result, the processing operation time at high concentration can be shortened.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of the present invention.

FIG. 2 is a side sectional view showing another embodiment of the present invention.

FIG. 3 is a sectional view of a swirling flow section.

[Explanation of symbols]

 A, A1, A2 ... Liquid flow A3, A4 ... Mixed flow Cr ... Shear gap D ... Swirling flow inner diameter G ... Generator Tr, Ts ... Step portion S ... Swirling Flow part h ... Ferrule flange j ... Clamp 1 ... Motor housing 2 ... Output shaft 2a ... Extension shaft 3 ... Stirring blade 3a ... First square bar 3b ... Second square bar 3c ... Third square bar 4 ... Stirring blade 4a ... Pin 10 ... Dispersion chamber casing 11 ... Dispersion chamber 12 ... Rotor 12a, 13a ... Teeth -Shaped recess 13 ... Stator 20 ... Suction chamber casing 20c ... Body 21 ... Suction chamber 22 ... Liquid suction port 23, 23a ... Outer weir 24, 24a ... Inner weir 25 ... Orifice 26 ... Cylindrical part 30 ... Suction cover 31 ... Powder The suction port 32 ... powder supply valve 33 ... powder hopper

Claims (1)

Claim: What is claimed is: 1. A powder-liquid mixing / dispersing machine which sucks powder and liquid by negative pressure generated by centrifugal action of a rotating body and mixes and disperses the mixture by the stirring force of the rotating body. A powder-liquid mixing / dispersing machine with a pre-stirring blade, characterized in that a stirring blade made of a rod-shaped member is provided on an extension shaft extending the shaft of the above to the side for sucking powder.